JPH11141969A - Hot water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water supply device by which an optimum water restriction control can be done, even when a water restriction control different from an ordinary hot water supply such as the supply of hot water to a bathtub or the supply of water to a drier and a stable hot water supply characteristic can be obtained. SOLUTION: A hot water supply device 1 comprises an ordinary hot water supply system 2 having a water throttle valve 16, a bathtub hot water supply system 4 for guiding hot water heated by the ordinary hot water supply system 2 to a bathtub 46 through a hot water supply valve 74 and a drier water supply system 5. In the hot water supply device 1, the position of the water throttle valve 16 during ordinary hot water supply is brought to a stand-by position. When the control of the water throttle valve 16 different from that of the ordinary hot water supply is carried out, the integrated value of the amount of operation of the water throttle valve 16 is obtained by using the stand-by position as a reference. When the control of the water throttle valve 16 different from that of the ordinary hot water supply is completed or interrupted, an operation amount equal to and in the direction opposite to the integrated value is applied to the water throttle valve 16 to reset it to the stand-by position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater having an automatic hot water supply function for a bathtub in addition to a general hot water supply for a kitchen or the like.
More specifically, the present invention relates to a water heater in which the opening degree of a water throttle valve provided in a water supply pipe is variably controlled in accordance with an operation state, so that stable hot water supply characteristics can be obtained.

[0002]

2. Description of the Related Art Conventionally, as a hot water supply system, in addition to a general hot water supply system in which water introduced into a water supply pipe is guided into a heat exchanger and heated by a gas burner and discharged from a hot water supply pipe, the water is heated by the general hot water supply system. It is known that a hot water supply is provided with a bathtub hot water supply system for supplying hot water to a bathtub through a hot water supply valve, and further provided with a bath kettle additional heating circulation system for circulating and heating the hot water in the bathtub (so-called hot water supply system). A bathtub with a bowl) is also known.

[0003] In such a water heater provided with a bathtub hot water supply system, when hot water is supplied to the bathtub, instead of supplying water into the bathtub and circulating and heating it by a bath-cooker additional heating circulation system, a general hot water supply system is used. It is performed by supplying hot water heated in the bathtub. Thereby, there is an advantage that the temperature of the bath can be quickly set to the optimum temperature.

[0004] Since the maximum heating power of a gas burner used in a general hot water supply system has an upper limit, the flow rate of hot water that can be flowed per unit time decreases as the tapping temperature increases.
On the other hand, in general hot water supply, a relatively small amount of relatively high-temperature hot water is sufficient, but in the case of bathtub hot water, a relatively large amount of relatively low-temperature hot water is required. Therefore, if the maximum flow rate of the water flowing into the water supply pipe is fixed, the usability becomes poor.

Therefore, in such a water heater, a water throttle valve is provided in the water supply pipe, and the maximum flow rate of water flowing through the water supply pipe is variably controlled according to the tapping method so that the tapping temperature does not fall below the set temperature. Has been done. That is, when performing general hot water supply, the hot water set temperature, tap water temperature and the signal from the incoming water flow rate sensor are used. Based on this, the water throttle valve is controlled (hereinafter, referred to as “maximum capacity control”) so that a heat exchanger provided in the general hot water supply system does not allow water to flow at a maximum flow rate that can be heated to the set temperature.

[0006] Further, the bathtub hot water supply system is usually configured to supply hot water and stop water by opening and closing a hot water supply valve.
If the hot water supply valve is suddenly closed at the end of hot water supply, there is a problem that the flow velocity in the pipe suddenly changes, abnormal pressure is generated, and so-called water hammer, which generates vibration and noise. Therefore, at the end of hot tub hot water supply, the water throttle valve is throttled to reduce the flow rate in the pipe sufficiently before closing the hot water supply valve.

As described above, in a water heater in which the maximum flow rate of water flowing through a water supply pipe is controlled by a water throttle valve, generally,
This involves a large opening adjustment of the water throttle valve during use.
Further, the water throttle valve is generally driven by a motor to adjust the degree of opening, but this type of motor usually moves the water throttle valve from fully open to fully closed even with no load. It takes about 9 seconds. Therefore, in a water heater with a large adjustment of the opening of the water throttle valve, a method of controlling the water throttle valve is important for stabilizing the flow rate and temperature of hot water at the time of tapping.

[0008] As a method of controlling such a water throttle valve,
For example, there is a method (hereinafter, referred to as a “first conventional example”) in which the water is stopped at a water squeezing position at the time of last water stop. FIG. 6 shows the relationship between the opening degree of the water throttle valve and the flow rate when the water throttle valve is controlled using this method.

In this method, when the power is turned on,
The water throttle valve is in a fully opened state (initial position). Then, when the general hot water supply is performed, the water throttle valve is throttled to the position of the maximum capacity control in the general hot water supply, and when the water stops, the water throttle valve is made to stand by at that position to prepare for the next hot water supply. Also,
When hot water is supplied from the bathtub, the water throttle valve is opened to the position of the maximum capacity control for hot water supply in the bathtub, and when water is stopped, the water throttle valve is throttled to a position where water hammer can be prevented, and the water throttle valve stands by at that position To prepare for the next hot spring.

Another method of controlling a water throttle valve is as follows.
A method of managing the standby position according to the water inlet temperature based on the squeezing time from the reference position and always waiting at that position (hereinafter referred to as “second
Conventional example). FIG. 7 shows the relationship between the opening degree of the water throttle valve and the flow rate when the water throttle valve is controlled using this method.

In this method, the state in which the water throttle valve is fully open is set as a reference position, and immediately after the power is turned on, the water throttle valve is throttled to the standby position and stands by in that state. The standby position is a position where the water throttle valve is throttled for a certain time from the reference position, and the throttle time is determined according to the incoming water temperature.

When the general hot water supply is performed, the opening of the water throttle valve is adjusted from the standby position to the position of the maximum capacity control in the general hot water supply, and when the water is stopped, the water throttle valve is temporarily moved to the reference position. It returns, and then it is squeezed to a standby position corresponding to the incoming water temperature, where it stands by. In addition, when hot water is supplied from the bathtub, the opening of the water throttle valve is adjusted from the standby position to the position of the maximum capacity control for hot water supply in the bathtub. After returning to the reference position, the water is throttled to a standby position corresponding to the incoming water temperature, and the water throttle valve is made to stand by at that position to prepare for the next hot water supply.

[0013]

In the first prior art in which the water throttle valve is made to stand by at the position where water was stopped last time, as shown in FIG. There is an advantage that the optimum water squeezing control can be promptly performed even when the intermittent use is performed. In addition, even when hot water is supplied to the bathtub after the general hot water supply, there is an advantage that the opening of the water throttle valve can be adjusted relatively quickly to the position of the maximum capacity control in hot water supply in the bathtub.

However, when hot water is supplied to the bathtub, the flow rate is reduced and water is stopped for the purpose of preventing water hammer, and the water throttle valve is kept on standby at that position. However, it takes several seconds for the water throttle valve to open from the throttle position for preventing water hammer to the position of the maximum capacity control in general hot water supply, and there is a problem that the flow rate is unstable and there is a sense of incongruity.

On the other hand, in the second conventional example in which the apparatus stands by at the standby position corresponding to the incoming water temperature, as shown in FIG. 7, there is no deviation between the standby position and the position of the maximum capacity control in general hot water supply or bath water supply. Is advantageous in that optimal water squeezing control can be performed quickly.

However, since the standby position is only a guide, a deviation easily occurs between the standby position and the position of the maximum capacity control depending on the installation conditions and the set temperature, and the flow rate tends to overshoot or undershoot immediately after tapping. There was a problem. In addition, since the fully open position is set as the reference position, the operation time for returning the water throttle valve to the standby position becomes longer, and when the intermittent use is performed for about 2 to 3 seconds, the opening degree of the water throttle valve is adjusted. However, there was a problem that the flow rate was not stable and the flow rate became unstable.

Further, in addition to the above configuration, a water heater having a drying operation function using a bathroom as a drying chamber is already known. Such a water heater has an expansion tank for absorbing the expansion and contraction of the hot water circulating in the dryer and the piping, but when the water level in the expansion tank drops during the drying operation, the water is supplied to the dryer. It is necessary to supply water by adding water.

However, since the expansion tank used for the drying operation usually has a small volume of about 0.5 liter, if the water is injected into the drier with the above-described method of controlling the water throttle valve, the water is not removed. There was a problem that the opening of the throttle valve could not be adjusted, and the expansion tank became full before the optimal water throttle control was performed, and water overflowed.

The problem to be solved by the present invention is that water hammer can be prevented even when water squeezing control different from ordinary hot water supply is performed, such as hot water supply to a bathtub or water supply to a dryer. In addition, the present invention provides a water heater capable of performing optimum water squeezing control promptly even at the beginning of tapping, at the time of intermittent use, and even when pouring water into a dryer, and obtaining stable tapping characteristics. It is in.

[0020]

In order to solve the above-mentioned problems, a water heater according to the present invention comprises a water throttle valve for regulating a maximum flow rate of water flowing through a heat exchanger, and an opening adjustment of the water throttle valve. A general water supply system for heating water flowing through the heat exchanger by a gas burner to supply hot water from a hot water supply pipe; and a branch provided from the general hot water supply system. A bathtub hot water supply system that supplies heated hot water to the bathtub by opening the hot water supply valve, and a position of the water throttle valve at the time of general hot water supply as a standby position, and when the water throttle valve at the time of bathtub hot water supply is controlled. The integrated value calculating means for calculating the integrated value of the operation amount of the water throttle valve based on the standby position, and when the control of the water throttle valve at the time of hot water supply to the bathtub is terminated or interrupted, the water throttle valve Equal to the integrated value and in the opposite direction It is intended to be subject matter of which is applied the operation amount and a return operation control means for returning to the standby position.

According to the water heater having the above configuration, the water throttle valve is controlled with the position of the water throttle valve at the time of general hot water supply as the standby position. Therefore, if the water throttle valve is controlled so as to be the maximum capacity control in the general hot water supply, the water throttle valve is
Unless there is a sudden change in the incoming water temperature or a change in the set temperature, the apparatus always waits at a fixed standby position. Thereby, when performing general hot water supply, optimal water squeezing control is quickly performed, and stable hot water discharge characteristics can be obtained.

When the water throttle valve is controlled when hot water is supplied to the bathtub, optimal control of the water throttle valve is executed simultaneously with tapping of the water, and at the same time, the operation amount of the water throttle valve with respect to the standby position is determined. Is obtained by the integrated value calculating means.
Then, when the control of the water throttle valve at the time of hot water supply in the bathtub is completed or interrupted, an operation amount equivalent to the integrated value and in the opposite direction to the water throttle valve is applied by the return operation control means, and the water throttle valve is controlled. Returns to the standby position.

Thus, even when the water throttle valve is controlled at the time of hot water supply in the bathtub, the water throttle valve stands by at the position of the maximum capacity control in the general hot water supply. Even in this case, optimal water squeezing control is quickly performed, and stable tapping characteristics can be obtained.

More specifically, a water throttle valve motor for adjusting the opening degree of the water throttle valve by driving a motor is used as the water throttle valve driving means, and the integrated value calculation means applies a voltage to the water throttle valve motor. Find the voltage ratio at predetermined time intervals,
The sign is changed between the voltage ratio in the direction in which the water throttle valve opens and the voltage ratio in the direction in which the water throttle valve is closed, and the sum thereof is obtained as an integrated value.The return operation control means controls the water throttle valve motor with respect to the water throttle valve motor. A return voltage ratio sufficient to enable quick operation is applied for a period of time opposite to the integrated value and equal to a value obtained by dividing the product of the integrated value and the time interval by the return voltage ratio. Alternatively, while continuing the integration by the integrated value calculating means, the voltage may be applied until the sign of the integrated value is inverted, or the voltage may be applied until the fully open and fully closed position is reached.

The product of the integrated value and the time interval corresponds to the sum of the positive work performed by the water throttle valve motor to open the valve and the negative work performed to close the valve. Therefore, if the return voltage ratio is applied to the motor drive source for a time that is the opposite sign to the integrated value and is equal to the product of the integrated value and the time interval divided by the return voltage ratio, This is because the water throttle valve can be returned to the original standby position, that is, the position of the maximum capacity control in the general hot water supply in the shortest time.

Further, instead of managing the return operation by time as described above, the return voltage ratio is applied to the water throttle valve motor while monitoring the sign of the integrated value, and the sign of the integrated value is inverted. The return operation may be terminated at a point in time, whereby the water throttle valve can be promptly returned to the original standby position. The “voltage ratio” refers to the ratio of the voltage actually applied to the maximum voltage that can be applied to the water throttle valve motor that adjusts the opening of the water throttle valve.

When the hot water supply to the bathtub by the bathtub hot water supply system is completed or interrupted, the water heater gradually decreases the opening of the water throttle valve and then closes the hot water supply valve. It is desirable to further provide.

When the hot water supply to the bathtub is completed or interrupted,
This is because the hot water supply valve is closed after the opening degree of the water throttle valve is gradually reduced, so that a rapid change in the flow rate of the water flowing through the pipe can be avoided, and water hammer can be prevented. Moreover, after the water hammer prevention operation control means is completed, the water throttle valve is returned to the original standby position in the shortest time by the return operation control means, so that there is no influence on the subsequent general hot water supply.

Further, in the water heater according to the present invention, when tapping is performed during the return operation of the water throttle valve by the return operation control means, the return operation is interrupted, and immediately It is desirable to further include an intermittent operation control unit that shifts to control of the water throttle valve according to the tapping method.

After the hot water supply in the bathtub is completed or interrupted, if the tapping is performed during the return operation of the water throttle valve by the return operation control means, the return operation is interrupted without continuing the return operation. However, if the optimum water throttle control according to the tapping method is immediately performed, the water throttle valve can be moved to the optimum water throttle position in a short time, and stable tapping characteristics can be obtained.

The second aspect of the present invention comprises a water throttle valve for regulating the maximum flow rate of water flowing through the heat exchanger, and a water throttle valve driving means for adjusting the opening of the water throttle valve. A general hot water supply system that heats water flowing through the exchanger by a gas burner and supplies hot water from a hot water supply pipe; and a branch provided from the general hot water supply system, and supplies hot water heated by the heat exchanger to a bathtub by opening a hot water supply valve. A bath water supply system for supplying hot water, a dryer water supply system for supplying water flowing through the general hot water supply system to a dryer in the bathroom by opening the hot water supply valve, and when water is supplied to the dryer,
After fully closing the water throttle valve, open the hot water supply valve, then open the water throttle valve to pour water into the dryer, and close or close the water supply valve when the water supply to the drier is completed or interrupted. Dryer water injection control means, when the position of the water throttle valve at the time of general hot water supply is a standby position, when controlling the water throttle valve at the time of hot water supply of the bathtub or at the time of water injection of the dryer,
Integrated value calculating means for obtaining an integrated value of the operation amount of the water throttle valve with reference to the standby position; and when the control of the water throttle valve at the time of hot water supply to a bathtub or at the time of water injection into a dryer is terminated or interrupted, the water throttle is provided. The gist of the invention is to provide a return operation control means for applying an amount of operation in the same direction as the integrated value and in the opposite direction to the valve to return the valve to the standby position.

According to the water heater having the above configuration, when water is injected into the dryer, the water throttle valve is fully closed, then the water heater valve is opened, and then the dryer is opened before water is injected into the dryer. Water injection is performed by opening the water throttle valve to an opening suitable for water injection into the water. Thereby, even when the capacity of the expansion tank for the drying operation is small, water can be injected without overflowing the water from the expansion tank. Moreover,
After the water injection into the dryer is completed, the water throttle valve is returned to the original standby position in the shortest time by the return operation control means, so that there is no influence on the subsequent general hot water supply.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a typical example of a water heater to which the present invention is applied. The illustrated water heater 1 includes a general hot water supply system 2 and a bath kettle additional heating circulation system 3
And a bathtub hot water supply system 4 and a dryer water injection system 5.

The general hot water supply system 2 includes a water supply pipe 10 and a tap water pipe 12.
And a first heat exchanger 14, and the water supply pipe 10 and the tapping pipe 12 are connected to an inlet and an outlet of the first heat exchanger 14, respectively. In the vicinity of the inlet of the water supply pipe 10, the water supply pipe 1
A water throttle valve 16 is provided for regulating the total amount of water flowing into zero. A water throttle valve motor (not shown) is connected to the water throttle valve 16, and the opening of the water throttle valve 16 can be variably controlled by the water throttle valve motor.

The water supply pipe 10 has a hot water supply water temperature thermistor 18 for measuring the temperature of water flowing into the water supply pipe 10, and a water flow sensor 20 for measuring the flow rate of water flowing into the water supply pipe 10. Is provided.

The hot water supply pipe 12 is provided near the outlet of the first heat exchanger 14 with a hot water supply hot water temperature thermistor 22 for measuring the temperature of hot water discharged from the first heat exchanger 14. Further, a faucet 24 for discharging hot water heated by the first heat exchanger 14 is provided at a tip of the tapping pipe 12. In FIG. 1, only one faucet 24 is shown, but this is merely an example, and a plurality of faucets 24 are usually provided, such as a kitchen, a washroom, and a shower.

In addition, the general hot water supply system 2 includes the first heat exchanger 14 disposed below the first heat exchanger 14.
A gas burner 26 for heating water flowing in the inside, and an original solenoid valve 30 provided in a gas pipe 28 of the gas burner;
A gas proportional valve 34 for controlling the flow rate of gas flowing through the main electromagnetic valve 32 and the gas pipe 28, and a blower fan 36 for supplying combustion air to the gas burner are provided.

The bath-cooker additional heating circulation system 3 includes an outgoing pipe 40, a return pipe 42, a second heat exchanger 44, and a bathtub 46. One end of each of the outgoing pipe 40 and the return pipe 42 is a second heat pipe. Exchanger 4
4, and the other end is connected to the bathtub 46.

The outgoing pipe 40 is provided from the bathtub 46 to the outgoing pipe 40.
A bath outlet temperature thermistor 48 for measuring the temperature of hot water flowing into the bath is provided, and a bath / drying circulation pump for circulating hot water in the bathtub 46 or a dryer 96 described later is provided at a downstream side thereof. A bath / dry water flow switch 52 for detecting whether or not hot water is flowing in the outflow pipe 40 is provided further downstream. Further, the return pipe 42 is provided with a bath / drying inlet temperature thermistor 54 for measuring the temperature of the hot water heated in the second heat exchanger 44.

In addition, the bath-cooker additional firing circulation system 3 is
A gas burner 56 for heating water flowing in the second heat exchanger 44 disposed below the heat exchanger 44
A main solenoid valve 62 provided in a gas pipe 58 of the gas burner, a gas proportional valve 64 for controlling a flow rate of gas flowing through the gas pipe 58, and a blower fan for supplying combustion air to the gas burner 66.
In addition, the gas pipe 58 is connected to the gas pipe 28 on the downstream side of the original electromagnetic valve 30, and shares the original electromagnetic valve 30.

The bathtub hot water supply system 4 is a system in which the general hot water supply system 2 and the bath-cooker additional heating circulation system 3 are connected via a connection pipe 70, and includes a water supply pipe 10, a first heat exchanger 14, and a tapping pipe 12. , A connecting pipe 70, and a going pipe 40.

More specifically, one end of the connection pipe 70 is connected to the tapping pipe 12 provided in the general hot water supply system 2 at a position downstream of the water supply / water supply temperature thermistor 22, and the other end of the connection pipe 70 is connected to the bath. The going pipe 40 provided in the kettle additional firing circulation system 3 is connected to a position upstream of the bath / drying circulation pump 50. The connecting pipe 70 has a bathtub 4.
6 or a bath for measuring the flow rate of water flowing into the dryer 96
A hot water supply flow rate sensor 72 and a hot water supply valve 74 for opening and closing the connection pipe 70 are provided.

The dryer water injection system 5 includes an expansion tank 80, an expansion tank outlet pipe 82, an expansion tank inlet pipe 84, a dryer inlet pipe 94, and a dryer 96. , Expansion tank 80 and second heat exchanger 44
This also serves as a dryer circulating system for circulating hot water. The expansion tank outlet pipe 82 has one end connected to the expansion tank 80 and the other end connected to the outflow pipe 40. Further, a first switching valve 86 for switching either hot water in the bathtub 46 or the hot water in the expansion tank 80 to flow into the outflow pipe 40 is provided at a connection portion between the expansion tank water pipe 82 and the outflow pipe 40. ing.

One end of the dryer inlet pipe 94 is connected to the dryer 9.
6 and the other end is connected to the return pipe 42. In addition, the connection between the dryer inlet pipe 94 and the return pipe 40 is used to switch and discharge hot water heated by the second heat exchanger 44 from the return pipe 40 to either the bathtub 46 or the dryer 96. The second switching valve 88 is provided. Further, the expansion tank inlet pipe 84 has one end connected to the dryer 96 and the other end connected to the expansion tank 80.

Further, in the expansion tank 80, a water level low side float switch 90 for detecting whether the water level in the expansion tank 80 has fallen below the lower limit value, and an expansion tank 8
A water level high side float switch 92 for detecting whether or not the water level within 0 has exceeded the upper limit value is provided.

Further, the water heater 1 shown in FIG. 1 comprises a hot water supply / inflow temperature thermistor 18, a water flow rate sensor 20, a hot water supply / outflow temperature thermistor 22, a bath outlet temperature thermistor 48, a bath / dry water flow switch 52, a bath / dry inlet temperature thermistor. 54, and a burner controller (not shown) for receiving signals from the bath / dry flow sensor 72 and controlling the original solenoid valve 30, the main solenoid valves 32 and 62, the gas proportional valves 34 and 64, and the blowing fans 36 and 66. doing.

The burner controller is a known CPU, R
It is composed of an OM, a RAM, and the like, and the ROM stores various programs for performing hot water temperature control and the like. The water heater 1 is provided with a remote controller (not shown) in a place such as a kitchen where a faucet 24 is installed or in a bathroom so that a remote controller can be operated.
The remote control includes a power switch, automatic hot water switch,
A reheating switch, a set temperature input device, and the like are provided.

Next, the basic operation of the general hot water supply system 2 using the hot water heater 1 configured as described above will be described. First, when a set temperature is input by remote control operation and the faucet 24 is opened, water flows into the water supply pipe 10 through the water throttle valve 16, and the inflow water is supplied to the first heat exchanger 14 and the tap water pipe. It is discharged from faucet 24 through 12.

At this time, the incoming water flow rate sensor 20 is
When the water flow in the inside is sensed, a command is sent from a burner controller (not shown), and the blowing fan 36 is driven, and the first
The combustion air is supplied to a gas burner 26 for heating the heat exchanger 14, and the main solenoid valve 30, the main solenoid valve 32 and the gas proportional valve 34 of the gas burner 26 are sequentially opened, and the combustion gas is removed from the gas burner 26. And the gas burner 26 is ignited by an ignition operation by an igniter (not shown).

When the gas burner 26 is initially ignited, feedforward control is performed based on the temperature of the water flowing through the water supply pipe 10 detected by the hot water supply water temperature sensor 18 and the flow rate per unit time detected by the water flow sensor 20. Accordingly, the opening degree of the gas proportional valve 34 of the gas burner 26 is adjusted such that the hot water temperature detected by the hot water supply / hot water temperature thermistor 22 becomes the set temperature, so that the combustion control of the gas burner 26 is performed.

After the combustion of the gas burner 26 is stabilized, the hot water supply temperature is corrected by feedback control based on the hot water temperature detected by the hot water supply / hot water temperature thermistor 22, so that the hot water temperature is maintained at the set temperature. The burner controller sends a signal to a proportional valve current circuit (not shown) of the gas proportional valve 34 and a blower fan drive circuit (not shown) to open the gas proportional valve 34 and the fan rotation speed of the blower fan 36. Is proportionally controlled, so that the gas burner 26
Is performed.

Next, a description will be given of a basic use operation when hot water is supplied by the hot water supply system 4. When an automatic hot water supply switch of a remote controller (not shown) attached to the bathroom is pressed, a hot water supply valve 74 provided on the connection pipe 70 is opened.

When the hot water supply valve 74 is opened, water flows into the general hot water supply system 2, and water discharged to the tapping pipe 12 through the first heat exchanger 14 passes through the connecting pipe 70 to the outgoing pipe 40. Flows into. Normally, the first switching valve 86 is located on the bathtub circulation side, so that the water flowing into the outgoing pipe 40 is supplied to the bathtub 4 as it is.
It is discharged into 6.

At this time, similarly to the case of the general hot water supply, when the incoming water flow rate sensor 20 detects the flow of water in the water supply pipe 10, the hot water outlet temperature thermistor 22 detects so that the outlet temperature becomes the set temperature. The ignition and combustion control of the gas burner 26 provided in the hot water supply system 2 is performed. And bathtub 4
The total amount of hot water discharged into 6 is measured by a bath / dry hot water supply flow rate sensor 72 provided in connection pipe 70, and when the integrated value of the flow rate reaches a set amount, hot water supply valve 74 is closed,
Bath water supply ends.

Next, a description will be given of a basic use operation in the case where reheating is performed by the recirculation system 3 of the bath kettle. When the reheating switch of the remote controller (not shown) attached to the bathroom is pressed, the bath / drying circulation pump 50 operates. Since the first switching valve 86 and the second switching valve 88 are normally on the bathtub circulation side, when the bath / drying circulation pump 50 operates, the hot water in the bathtub 46 passes through the going pipe 40 and the second switching valve 86 and the second switching valve 88 pass through the second pipe. The hot water sent into the heat exchanger 44 and discharged from the second heat exchanger 44 is returned to the bathtub 46 through the return pipe 42.

At this time, when the bath / dry water flow switch 52 senses the water flow in the going pipe 40, a command is sent from a burner controller (not shown), the blowing fan 66 is driven, and the second heat exchanger 44 is turned on. Gas burner 5 for heating
6, the combustion air is supplied, and the main electromagnetic valve 30 and the main electromagnetic valve 62 and the gas proportional valve 64 of the gas burner 56 are sequentially opened to supply the combustion gas to the gas burner 56, and the igniter (not shown). The gas burner 56 is ignited by the ignition operation.

After the gas burner 56 is ignited, the opening of the gas proportional valve 64 of the gas burner 56 and the rotation speed of the blower fan 66 are fixed so as to have the maximum capacity, and the combustion of the gas burner 56 is performed in that state. . Further, a signal is sent from the burner controller to a phase control circuit (not shown) of the bath / drying circulation pump 50 so that the tap water temperature detected by the bath / drying inlet temperature thermistor 54 is maintained in a predetermined temperature range. Next, the capacity of the bath / drying circulation pump 50 is variably controlled. And the bath outlet temperature thermistor 48
When the temperature of the bathtub detected at the step reaches the set temperature, the main solenoid valve 30 and the main solenoid valve 62 are closed, and the combustion of the gas burner 56 is terminated.

The bath-cooker additional heating circulation system 3 is activated by an additional heating switch, and when a bathtub hot water supply system 4 automatically supplies hot water, a predetermined amount of hot water is supplied into the bathtub 46 by a flow rate sensor or the like. When it is detected that the hot water is supplied, the bathtub hot water supply is terminated, and the bath-cooker additional firing circulation system 3 may be automatically activated at regular time intervals (for example, every 10 minutes). With this configuration, the temperature of the hot water in the bathtub 46 can always be maintained at a constant temperature.

Next, the basic use operation of the drying operation and the water injection operation by the dryer water injection system 5 performed at that time will be described. When a drying operation switch of a remote controller (not shown) provided in the bathroom is pressed, the first switching valve 86 and the second switching valve 88 are operated, and the circulation circuit is switched to the dryer circulation side.

Next, the bath / drying circulation pump 50 is operated, and the water in the expansion tank 80 is sent from the expansion tank 80 to the second heat exchanger 44 through the expansion tank outlet pipe 82 and the outgoing pipe 40. The heated hot water is returned to the return pipe 42, the dryer inlet pipe 94, the dryer 96, and the expansion tank inlet pipe 84.
Are sequentially returned to the expansion tank 80.

When the bath / dry water flow switch 52 detects the flow of water in the outflow pipe 40 as in the case of the additional heating, the gas burner 56 provided in the additional
Is ignited. After the gas burner 56 is ignited,
The opening of the gas proportional valve 64 of the gas burner 56 is feedback-controlled so that the temperature detected by the bath / drying inlet temperature thermistor 54 becomes a predetermined temperature.
Is controlled.

At this time, when the amount of water in the expansion tank 80 decreases and the low water level float switch 90 is turned off,
The hot water supply valve 74 is opened after the opening degree of the water throttle valve 16, which will be described later, is adjusted, and the water flowing from the water supply pipe 10 through the first heat exchanger 14 flows through the tapping pipe 12 and the connection pipe 70. Tube 4
It is replenished within 0. In this case, the expansion tank 80
Is small (about 0.5 liter), the gas burner provided in the first heat exchanger 14 is not ignited, and water is injected as it is.

The water supplied to the outgoing pipe 40 continues to circulate through the dryer water injection system 5 as it is, so that the water level in the expansion tank 80 gradually rises, and the low water level float switch 90 is first turned on. Further, if the water supply is continued, the water level high side float switch 92 is turned ON. At this time, the hot water supply valve 74 is closed, and the supply of the water to the dryer 96 is stopped. Then, in this state, the drying operation is continued, and again, during the drying operation, the water level low side float switch 90 is operated.
Is turned off, the hot water supply valve 74 is opened to supply water.

Next, a method of controlling the water throttle valve 16 according to the present invention will be described. FIG. 2 shows a water throttle valve 1 according to the present invention.
6 shows the relationship between the opening degree of the water throttle valve 16 and the flow rate when the control method 6 is used. In FIG. 2, when the power is turned on, the water throttle valve 16 is in a fully opened state (initial position). Next, when the first general hot water supply is performed, the water throttle valve 16 is throttled from the fully opened position to the position of the maximum capacity control in the general hot water supply, and when water is stopped, the water throttle valve 16 is made to stand by at that position.

At the time of the first general hot water supply, the flow rate greatly overshoots immediately after tapping, but this is because the water throttle valve 16 is not operated until the first general hot water supply is performed after the power is turned on. This is because it takes a long time for the opening degree of the water throttle valve 16 to be reduced to the position of the maximum capacity control in the general hot water supply, since it is in the fully opened state. Further, the reason why the water throttle valve 16 is slightly opened at the time of stopping water is that the water throttle valve 16 responds to a decrease in the flow rate at the time of stopping water.

When the second or subsequent general hot water supply is to be performed, the water throttle valve 16 is already waiting at the position of the maximum capacity control in the general hot water supply.
The maximum capacity control in the general hot water supply is immediately performed without adjusting the opening degree. Therefore, the flow rate is not large immediately after tapping, and does not overshoot or undershoot.

Even when intermittent hot water supply is performed by the general hot water supply system at intervals of 2 to 3 seconds, the water throttle valve 16 is on standby at the position of the maximum capacity control in the general hot water supply.
Unless the set temperature is changed, the flow rate will not be unstable.

When hot water is supplied to the bathtub after the general hot water supply, the hot water set temperature and the bath set temperature are usually different. Therefore, at the same time when the hot water supply valve 74 is opened, the water throttle valve 16 is moved to the position for controlling the maximum capacity in the bathtub hot water supply. Opening adjustment (in the case of FIG. 2,
Opening operation) is performed. Next, when the bathtub hot water supply is completed, a water throttle valve 16 is provided to prevent water hammer.
Is gradually reduced, the flow rate is reduced to a certain value or less (for example, 6 liters / minute or less), and then the hot water supply valve 74 is closed. Then, by the return operation control means described later, the water throttle valve 16
It returns to the position of the maximum capacity control in the general hot water supply in the shortest time, and waits there.

As described above, the water throttle valve 16 according to the present invention
According to the control method, the water throttle valve 16 different from the general hot water supply is used.
Is performed, the water throttle valve 16 always stands by at the position of the maximum capacity control in the general hot water supply, so that even after the general hot water supply is performed, the flow rate does not become unstable. At the same time as the general hot water supply is performed, the maximum capacity control is performed immediately. Therefore, as long as the hot water supply set temperature is not changed, stable hot water supply characteristics can always be obtained.

Next, the calculation of the integrated value and the return operation of the water throttle valve 16 will be specifically described by taking a case of hot water supply in a bathtub as an example. As described above, the voltage ratio e applied to the water throttle valve motor between the time when the hot water supply valve 74 is opened and the bath water supply is started and the time when the hot water supply valve 74 is closed and the bath water supply is completed.
(%) Is measured at a certain time interval t (second).

Then, the integrated value Σe at the position of the maximum capacity control in the general hot water supply is set to 0, and the case where the voltage ratio is applied in the opening direction from the position is positive, and the case where the voltage ratio is applied in the closing direction is negative. These are added, and this is added to the integrated value Σe
And

The product of the voltage ratio e applied in the opening direction and the time interval t is determined by the positive work performed on the water throttle valve motor and by the voltage ratio e applied in the closing direction and the time interval t. The product with t is equal to the negative work done on the water throttle valve motor. Thus, the product of the integrated value Δe and the time interval t is equal to the total work performed on the water throttle valve motor. Further, if the sign is positive, it means that the water throttle valve 16 is more open than the position of the maximum capacity control in the general hot water supply at the end of bathtub hot water supply. This means that the throttle valve 16 is closed.

Therefore, in order to return the water throttle valve 16 to the original position after the hot water supply valve 74 is closed, that is, the position of the maximum capacity control in the general hot water supply, the value of Δe at the time when the hot water supply valve 74 is closed is set.
The work amount whose absolute value is equal to the t value and whose sign is opposite to that of the water throttle valve motor is controlled so that the integrated value Σe becomes zero.

As a result, the integrated value Δe is set to 0
Is sufficient, and there is no particular limitation. However, the rotation speed of the water throttle valve motor is proportional to the voltage ratio applied to the motor, and the higher the voltage ratio applied, the higher the rotation speed. Change the ratio for a certain period of time (hereinafter,
(Referred to as “return time”). Thereby, the water throttle valve 16 can be returned to the position of the maximum capacity control in the general hot water supply in the shortest time.

Here, assuming that the return time is T, a 100% voltage ratio is applied during the return operation. Therefore, the total work performed on the water throttle valve 16 during the return operation is 1
00T. It is sufficient that this value is equal to the absolute value of the Σet value at the time when the hot water supply valve 74 is closed.
, Ie, “| Σet | / 100”.

FIG. 3A shows the change over time of the opening degree of the water throttle valve 16 before and after the hot water supply in the bathtub, and FIGS.
At this time, the change over time of the positive and negative voltage ratios applied to the water throttle valve motor, and (d) shows the change over time of the integrated value Δe of the voltage ratio applied to the water throttle valve motor. Each is shown schematically.

FIG. 3 will be described in more detail. When hot water supply is started and the hot water supply valve 74 is opened, a positive voltage ratio is applied to the water throttle valve motor in a pattern as shown in FIG. 3 (b). You. Therefore, the water throttle valve 16 waiting at the position of the maximum capacity control in the general hot water supply is quickly opened to the position of the maximum capacity control in the bath water supply. At this time, the voltage ratio e applied to the water throttle valve motor is measured at a constant measurement interval t (16 ms in FIG. 3), and the integrated value Δe is calculated.

The calculated integrated value Δe monotonically increases as shown in FIG. 3D, and becomes a constant value (FIG. 3) when the water throttle valve 16 is opened to the position of the maximum capacity control in hot water supply in a bathtub. In the case of the example shown in (d), it is 440 (%)) and is once stabilized.

FIG. 3 assumes a case in which some disturbance is applied during hot water supply to the bathtub, and the opening of the water throttle valve 16 slightly fluctuates on the way. In this case, the voltage ratio is applied to the water throttle valve motor in the order of positive, negative, and positive. Therefore, when these are added, the integrated value の e after the disturbance is removed becomes 340 ( %).

Next, when the bathtub hot water supply is terminated, a 100% negative voltage ratio is applied to the water throttle valve 16 before the hot water supply valve 74 is closed, and the water throttle valve 16 is quickly throttled. Then, when the water throttle valve 16 is throttled to a position where the water hammer can be prevented, the hot water supply valve 74 is closed. The integrated value Δe at this time is -250 (%).

Next, by applying a voltage ratio of 100% for T seconds in a direction opposite to the integrated value Δe at the time when the hot water supply valve 74 is closed, that is, in a positive direction, the maximum capacity control position in the general hot water supply is reached. The water throttle valve 16 is promptly returned to a standby state at that position, and the bathtub hot water supply ends. In the case of the example shown in FIG. 3, the return time T is 40 ms.

FIGS. 4A and 4B show changes over time in the opening degree of the water throttle valve 16 before and after water injection into the dryer.
Shows the time-dependent change of the positive and negative voltage ratios applied to the water throttle valve motor at that time, and FIG. 12D shows the time-dependent change of the integrated value Δe of the voltage ratio applied to the water throttle valve motor. Each of the changes is schematically shown.

The calculation of the integrated value of the voltage ratio applied to the water throttle valve motor before and after the water injection into the dryer and the return operation are almost the same as in the case of hot water supply in a bathtub. 4 will be described in more detail. When the burner controller detects the water level low side float switch 90 OFF during the drying operation, a command is issued to temporarily close the water throttle valve 16 once before injecting water into the dryer 96. Sent. Because the capacity of the expansion tank 80 is small, if water is injected as it is, the expansion tank 80 becomes full and overflows before the water throttle valve 16 is properly throttled.

Then, at the same time as the command to fully close is sent,
A negative voltage ratio of 100% is applied to the water throttle valve motor, and the water throttle valve 16 is quickly throttled from the position of the maximum capacity control in the general hot water supply to the fully closed position. At this time, the voltage ratio e applied to the water throttle valve motor is measured at a constant measurement interval t (16 ms in FIG. 3), and the integrated value Δe is calculated. In the example shown in FIG. 4D, the integrated value Δe at this time is −500 (%).

Next, when the hot water supply valve 74 is opened,
A positive voltage ratio is applied to the water throttle valve motor in the pattern shown in FIG. 4B, and the water throttle valve 16 is opened to a water throttle position (for example, a flow rate of 5 liter / min) suitable for water injection into the dryer. Water injection is performed. When the burner controller detects the high water level float switch 92 ON, the hot water supply valve 74
Is closed once, and the apparatus waits for a certain time while maintaining the opening of the water throttle valve 16. In the example shown in FIG. 4D, the integrated value Δe at this point is −280 (%).

When the amount of water in the dryer water injection system 5 is small,
Water level low side float switch 90 turns off again within a few seconds
In this case, the hot water supply valve 74 is opened again, and water is supplied until the high water level float switch 92 is turned on. In the example of FIG. 4, disturbance is applied at the time of the second water injection, the opening of the water throttle valve 16 is adjusted, and the integrated value at the time when the water level in the expansion tank 80 is stabilized and the water injection is completed.
e is -250 (%).

After the water injection is completed, a voltage of 100% is applied for T seconds in a direction opposite to the integrated value Δe at the time of the completion of the water injection, that is, in a positive direction, so that the water throttle valve 16 is set to the maximum in the general hot water supply. The water is immediately returned to the capacity control position, and the water injection into the dryer 96 is completed. In the case of the example shown in FIG. 4, the return time T is 40 ms.

Next, how the water throttle valve 16 according to the present invention is controlled will be described with reference to the flowcharts of FIGS. 5A, 5B and 5C. When performing general hot water supply, first, when the user sets the hot water temperature by operating the remote controller and opens the faucet 24, the control routine shown in FIG. 5A is started.

First, in step S1 (hereinafter simply referred to as "S1").
), It is determined whether or not hot water is supplied to the bathtub. In this case, since general hot water is supplied (S1: N
O), proceed to S2. In S2, it is determined whether or not the water level low side float switch (LLS) 90 has been turned off during the drying operation. In this case, since it is general hot water supply (S2: NO), the process directly proceeds to S3. .

At S3, the incoming water flow rate sensor (HWFS) 2
0 detects the water flow, and it is determined whether the faucet 24 is open. In this case, general hot water is supplied, and the faucet 24 is open (S3: YES), and the process proceeds to S16. In S16, the hot water supply temperature input by the remote control operation is read into the burner controller as the set temperature.

Next, in step S17, a water throttle amount for controlling the maximum capacity in general hot water supply is calculated based on the hot water supply set temperature, the incoming water temperature, and a signal from the incoming water flow sensor 20. Then, in S18, the voltage ratio is applied to the water throttle valve motor so that the water throttle amount calculated in S17 is obtained, and in S19, the integrated value Δe of the voltage ratio is reset to 0. Thereafter, the process returns to S1, and the steps S1 to S3 and S16 to S19 described above are repeated while the faucet 24 is open.

On the other hand, when the general hot water supply ends, it is determined in S3 that the faucet 24 has been closed (S3: N
O), and then proceed to S4. In S4, it is determined whether the integrated value Σe is 0 or not. In the case of general hot water supply, the integrated value Σe is reset to 0 in S19 (S4: YE
S), so the process proceeds to S15. And in S15,
The water throttle valve motor is stopped without changing the position of the water throttle valve 16, and the general hot water supply ends. As a result, the water throttle valve 16 stands by at the position of the maximum capacity control in the general hot water supply, and prepares for the next hot water supply.

Next, the water throttle valve 16 for supplying hot water to the bathtub is used.
Will be described. When the user sets the bath temperature by operating the remote controller and presses the automatic hot water supply switch, FIG.
The control routine shown in FIG. Then, in S1, it is determined whether or not hot water is supplied to the bathtub. In this case, the hot water is supplied to the bathtub (S1: YES).
The flow shifts to S20 in the control routine shown in B.

In S20, the bath temperature input by the remote control operation is read into the burner controller as a bath set temperature. Next, the process proceeds to S21, where the hot water supply valve (BHV) 74 is opened. And S22
In step (3), the amount of water squeezing is calculated based on the bath set temperature, the incoming water temperature, and the signal from the incoming water flow rate sensor 20 so that the maximum capacity can be controlled in hot water supply to the bathtub. Next, in S23, a voltage ratio is applied to the water throttle valve motor so that the water throttle amount calculated in S22 is obtained, and in S24, an integrated value Σe of the voltage ratio applied to the water throttle valve motor is obtained. .

Then, the program proceeds to S25, in which it is determined whether or not bath water supply has been interrupted. When bathtub hot water supply is interrupted (S
25: YES), the process proceeds to S27 described later, and if not interrupted, the process proceeds to S26. In S26, it is determined whether or not hot water has been supplied up to the set amount. If the hot water has not been supplied to the set amount (S26: NO), the process returns to S22, and the steps from S22 to S26 are repeated.

When the hot water is supplied up to the set amount (S2
6: NO), the process proceeds to S27, and the incoming water flow rate sensor (HW
FS) 20 and bath / dry hot water supply flow rate sensor (BWFS) 7
2, it is determined whether the faucet 24 is open. Incoming water flow sensor (HWFS) 2
0 is the flow rate detected by the bath / dry hot water supply flow sensor (BW
FS) If the flow rate is larger than the flow rate detected in 72,
4 is open, so in that case (S2
7: YES) is a hot water supply valve (BHW) 74 in S28.
And further proceeds to S16, and the water throttle valve control in the general hot water supply described above is continued without performing an operation for preventing water hammer described later.

On the other hand, when the faucet 24 is not opened,
Since the flow rate detected by the incoming water flow rate sensor (HWFS) 20 is equal to the flow rate detected by the bath / dry hot water supply flow rate sensor (BWFS) 72, in this case (S27: NO),
Proceeding to S29, in order to prevent water hammer, a water throttle amount is calculated such that the flow rate is 5 liters / minute or less.

Then, in S30, the voltage ratio is applied to the water throttle valve motor so that the water throttle amount obtained in S29 is obtained, and in S31, the integrated value Σe of the voltage ratio applied to the water throttle valve motor is calculated. Is calculated. Then, S
Proceeding to 32, it is determined whether the flow rate detected by the incoming water flow rate sensor 20 has reached 6 liters / minute. If the flow rate is not 6 liters / minute or less, the process returns to S27, and the above steps S27 to S32 are repeated. On the other hand, when the flow rate becomes 6 liters / minute or less, the process proceeds to S33, and the hot water supply valve (BHV) 74 is closed. As a result, a sudden change in the flow velocity in the pipe can be avoided, and water hammer can be prevented.

After closing the hot water supply valve (BHV) 74, FIG.
The process proceeds to S4 shown in A. In S4, the integrated value Σe is 0
Is determined. Unlike the case of general hot water supply, in the case of bath water supply, the integrated value $ e is not 0 (S4: YES).
Therefore, the process proceeds to S5, where the return time T is calculated. Next, the process proceeds to S6, where the sign of the integrated value Δe is determined. If the integrated value Σe is negative (S6: NO), the water throttle valve 1
6 is located at a position narrower than the position of the maximum capacity control in the general hot water supply, the process proceeds to S7, and a voltage ratio of 100% is applied to the water throttle valve motor in the opening direction for the return time T obtained in S5. And proceed to S9.

If the integrated value Σe is positive in S6 (S6: YES), the water throttle valve 16 is at a position opened from the position of the maximum capacity control in the general hot water supply, so the process proceeds to S8. 10 in the closing direction for the water throttle valve motor
A voltage ratio of 0% is applied for the return time T obtained in S5, and the process proceeds to S9.

In S9, the integrated value Δe is calculated again. Then, the process proceeds to S10, where it is determined whether or not bathtub hot water supply has been started. If the bathtub hot water supply is not started (S10: NO), the process proceeds to S11, where the water level low side float switch (LLS) 90 is turned off during the drying operation.
Is determined. If the water level low side float switch (LLS) 90 is not OFF (S11: NO), the process further proceeds to S12, where the incoming water flow rate sensor (H
Based on the signal from the WFS 20, it is determined whether the faucet 24 is open.

When the faucet 24 is not open (S12: N
O) proceeds to S13, and it is determined whether or not the return time T obtained in S5 has elapsed. If the return time T has not elapsed (S13: NO), the process returns to S9, and the above steps S9 to S13 are repeated. On the other hand, if the return time T has elapsed (S13: YES), the process proceeds to S14, where the integrated value Σe is reset to 0, and further proceeds to S15, where the water throttle valve motor is stopped, and the bathtub hot water supply ends. . As a result, the water throttle valve 16 returns to the position of the maximum capacity control in the general hot water supply in the shortest time.

If the hot water supply of the bathtub is resumed during the return operation of the water throttle valve 16 (S10: YES), the return operation of the water throttle valve 16 is interrupted, and the process proceeds to S20 shown in FIG. 5B. Steps S20 to S33 are executed again. Similarly, when the drying operation is performed during the return operation of the water throttle valve 16 and the water level low side float switch (LLS) 90 is turned off at this time (S1).
1: YES), the process proceeds to S34 described later, and S34 to S5.
One step is performed.

Further, if the faucet 24 is opened during the return operation of the water throttle valve 16 (S12: YES), the process proceeds to S16, and the above-mentioned S16 to S19 and S1 to S1 are performed.
Steps 4 and S15 are executed. This gives 2
Even when intermittent use is performed at intervals of about 3 seconds, optimal control of the water throttle valve 16 can be performed quickly.

Next, control of the water throttle valve 16 when water is injected into the dryer 96 will be described. When the user presses the drying operation switch by remote control operation, the first switching valve 86 and the second switching valve 88 are switched to the dryer circulation side, and then the bath / drying circulation pump 50 is operated, and the water in the expansion tank 80 is turned on. Is guided into the second heat exchanger 44 to be circulated and heated. Then, at the same time as the drying operation is started, the control routine shown in FIG. 5A is started.

In this case, it is not a bathtub hot water supply (S1: N
O), the process proceeds from S1 to S2, where it is determined whether or not the water level in the expansion tank 80 has dropped during the drying operation and the water level low side float switch (LLS) 90 has been turned off. Water level low side float switch (LLS) 90 is OF
F (S2: YES), S shown in FIG.
Proceeding to 34, it is determined whether the faucet 24 is open. When the faucet 24 is open (S34: YE
In S), if the water is injected into the dryer 96 as it is, the flow rate is too large and the water overflows from the expansion tank 80. Therefore, the process proceeds to S3, and the injection of the water into the dryer 96 is interrupted until the general hot water supply is completed.

On the other hand, when the general hot water supply is not performed or when the general hot water supply is completed (S34: NO), the process proceeds to S35, and it is determined whether the drying operation is interrupted. If the drying operation is interrupted (S35: YES), the drying device 9
Since it is not necessary to inject water into the water throttle valve 16, the process directly proceeds to S 4, and the above-described steps S 4 to S 15 are executed.
Returns to the position of the maximum capacity control in the general hot water supply.

If the drying operation has not been interrupted (S35: YES), the flow proceeds to S36, where it is determined whether or not the water throttle valve 16 is in the fully closed state. If the water throttle valve 16 is not fully closed (S36: NO), if the hot water supply valve (BHV) 74 is opened as it is, water overflows from the expansion tank 80, so the process proceeds to S37 and the water throttle valve motor is closed in the closing direction. A voltage ratio of 100% is applied. Then, in S38, the integrated value Δe of the voltage ratio applied to the water throttle valve motor is calculated, and then the process returns to S34, and the above-described steps S34 to S38 are repeated until the water throttle valve 16 is fully closed.

When the water throttle valve 16 is fully closed (S
36: YES), proceeding to S39, hot water supply valve (BHV) 74
Is opened. Then, the process proceeds to S40, where the water supply pipe 10
Is calculated such that the amount of water flowing through is 5 liters / minute. Next, in S41, the voltage ratio is applied to the water throttle valve motor so that the water throttle amount obtained in S40 is obtained, and in S42, the integrated value Σe of the voltage ratio applied to the water throttle valve motor is calculated. You.

Then, the flow advances to S43, where it is determined again whether the drying operation has been interrupted. If the drying operation has been interrupted (S43: YES), there is no need to continue water injection into the dryer 96, so the flow returns to S4, and the aforementioned S4 is performed.
Steps S15 to S15 are performed, and the return operation of the water throttle valve 16 is performed.

On the other hand, if the drying operation has not been interrupted (S43: NO), the process proceeds to S44, where it is determined again whether the faucet 24 has been opened. When the water faucet 24 is opened (S44: YES), if the water injection into the dryer 96 is continued, the flow rate becomes too large and the water overflows from the expansion tank 80. Therefore, the process proceeds to S45 and the hot water supply valve (BHV) 74 Close
Further, the process proceeds to S16, in which the control of the water throttle valve 16 for general hot water supply is executed, and the injection of water into the dryer 96 is suspended until the general hot water supply ends.

When the faucet 24 is not opened (S
(44: NO), the process proceeds to S46, in which it is determined whether or not the high water level float switch (HLS) 92 is ON. Water level high side float switch (HLS)
If the switch 92 is not ON (S46: NO), the flow returns to S39 because the amount of water is not sufficient, and the above-mentioned steps S39 to S39 are performed.
The step of S46 is repeated, and the water injection is continued.

On the other hand, the water level high side float switch (HL)
S) When 92 is turned ON (S46: YES), S
Proceeding to 57, the hot water supply valve (BHV) 74 is closed, and the injection of water into the dryer 96 is temporarily interrupted. Then, in S48, it is determined again whether the faucet 24 is opened, and if the faucet 24 is opened (S48: YES), S1 is performed.
The program proceeds to step 6, where the control is shifted to water throttle control for general hot water supply.

On the other hand, if the faucet 24 has not been opened (S48: NO), the process proceeds to S49, where it is determined whether or not the drying operation has been interrupted. If the drying operation has been interrupted (S49: YES), there is no need to continue water injection into the dryer 96, so the process directly proceeds to S4, and the aforementioned S4 to S4 are performed.
Step 15 is executed, and the return operation of the water throttle valve 16 is performed.

On the other hand, if the drying operation is not interrupted (S49: NO), the process proceeds to S50, where it is determined whether or not the water level low side float switch (LLS) 90 is OFF. Water level low side float switch (LL
S) When 90 is OFF (S50: YES)
Returns to S39, the hot water supply valve (BHV) 74 is opened, and the water level high side float switch (HLS) 92 is turned on.
Steps S39 to S50 described above are repeated until.

Further, the water level low side float switch (LL)
S) When 90 is not OFF (S50: NO)
Proceeds to S51, and it is determined whether or not a predetermined water level stabilization wait time (for example, 10 seconds) has elapsed.
When the water level stabilization wait time has not elapsed (S51: N
O), since the water level in the expansion tank 80 may decrease after a few seconds, return to S48 and check whether the water level low side float switch (LLS) 90 is OFF until the water level stabilization wait time has elapsed. Monitor.

Then, the water level low side float switch (LL)
S) If the water level stabilization waiting time has elapsed without turning OFF 90 (S51: YES), the process returns to S4, and the above steps S4 to S15 are executed.
The position of the water throttle valve 16 is returned to the position of the maximum capacity control in the general hot water supply, and the water injection into the dryer 96 ends.

Note that in FIGS. 5A, 5B and 5C, the integrated value calculating means includes S9, S24, S31, S38 and S38.
42, the return operation control means includes a step S4.
Steps from S to S15 (excluding S10 to S12)
In response to the above, the water hammer preventing operation control means
The intermittent operation control means corresponds to steps S10 to S12.

S16 to S19 correspond to the control means of the water throttle valve 16 in the general hot water supply, and S20 to S26 correspond to
S34 to S51 correspond to the control means of the water throttle valve 16 in the bathtub hot water supply and hot water supply, respectively, and also correspond to the dryer water injection control means.

As described above, according to the water heater according to the present invention, water hammer can be prevented even when water squeezing control different from ordinary hot water supply such as bathtub hot water supply or dryer water injection is performed. At the same time, the optimum water squeezing control can be performed promptly at the beginning of tapping, at the time of intermittent use, or even when water is injected into the dryer, and stable tapping characteristics can be obtained.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention. For example, in the above embodiment, the position of the water throttle valve is managed by the return time from the position of the maximum capacity control in the general hot water supply, but is directly managed by the integrated value Σe of the voltage ratio applied to the water throttle valve motor. May be. Further, in the calculation of the integrated value, the time interval t is fixed, but control may be performed so that the time interval t is variable.

Further, in the above-described embodiment, the case of the hot water supply device having the bath-cooker additional heating circulation function and the drying operation function has been described, but the hot-water supply device not having the bath-cooker additional heating circulation function and / or the drying operation function. Even in the case of a container, the same effect as in the above embodiment can be obtained.

[0123]

According to the water heater according to the present invention, when the position of the maximum capacity control in the general hot water supply is set to the standby position and the water throttle valve different from the general hot water supply is controlled, the water throttle valve motor is controlled. When the control of the water throttle valve different from general hot water supply is terminated or interrupted,
An operation amount in the same direction as the integrated value and in the opposite direction is applied to the water throttle valve so as to return to the standby position, so that the water is supplied to the bathtub or water is supplied to the dryer. However, for general hot water supply, optimal water squeezing control is quickly performed, and there is an effect that stable tapping characteristics can be obtained.

When water is injected into the dryer, the water throttle valve is once fully closed, and then the hot water supply valve is opened to control the water throttle valve suitable for water injection. When pouring water, there is no risk of water overflowing from the expansion tank.

Further, when the tapping of the hot water is performed while the above-described returning operation is being performed, the returning operation of the water throttle valve is interrupted, and the control immediately shifts to the control of the water throttle valve according to the tapping method. Thus, there is an effect that the optimal control of the water throttle valve is promptly performed even when the intermittent use is performed at intervals of about 2 to 3 seconds.

As described above, according to the present invention, stable tapping characteristics can be obtained even when a water throttle valve different from that of general hot water supply is controlled. Since the usability of the water heater can be remarkably improved, the present invention is extremely effective industrially.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a water heater according to the present invention.

FIG. 2 is a diagram showing the relationship between the opening of the water throttle valve and the flow rate when the control means for the water throttle valve according to the present invention is used.

FIG. 3 (a) shows the change over time in the opening of the water throttle valve before and after hot water supply to the bathtub, and FIGS. 3 (b) and (c) show the positive and negative voltages applied to the water throttle valve motor at that time. FIG. 3D is a diagram showing a change over time in the integrated value of the voltage ratio.

FIG. 4 (a) shows the change over time of the opening of the water throttle valve before and after water injection into the dryer, and FIGS. 4 (b) and (c) show the positive and negative values applied to the water throttle valve motor at that time. FIG. 4D is a diagram illustrating a temporal change in the negative voltage ratio, and FIG. 4D is a diagram illustrating a temporal change in the integrated value of the voltage ratio.

FIG. 5A is a control flowchart for executing control of a water throttle valve according to the present invention.

FIG. 5B is a continuation of the control flowchart shown in FIG. 5A.

FIG. 5C is a continuation of the control flowchart shown in FIG. 5A.

FIG. 6 is a diagram illustrating a relationship between the opening degree of the water throttle valve and the flow rate when the water throttle valve is controlled by a method of making the water throttle valve stand by at a position at the time of the last stop of water.

FIG. 7 is a diagram illustrating a relationship between the opening degree of the water throttle valve and the flow rate when the water throttle valve is controlled by a method of making the water throttle valve stand by at a standby position according to the incoming water temperature.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot water supply 2 General hot water supply system 4 Bath water supply system 5 Dryer water supply system 10 Water supply pipe 12 Hot water supply pipe 14 First heat exchanger 16 Water throttle valve 44 Second heat exchanger 46 Bathtub 74 Hot water supply valve 80 Expansion tank 96 Drying vessel

Claims (8)

[Claims] 1. A water throttle valve for regulating a maximum flow rate of water flowing through a heat exchanger, and a water throttle valve driving means for adjusting an opening degree of the water throttle valve, wherein the water flowing through the heat exchanger is supplied to a gas burner. A general hot water supply system for heating the hot water from the hot water supply pipe, and a bathtub hot water supply system that is provided branched from the general hot water supply system and supplies hot water heated by the heat exchanger to the bathtub by opening a hot water supply valve; When the position of the water throttle valve at the time of general hot water supply is a standby position, and the control of the water throttle valve at the time of hot water supply to the bathtub is performed, the integrated value of the operation amount of the water throttle valve based on the standby position is calculated. An integrated value calculating means to be sought; and when the control of the water throttle valve at the time of hot water supply to the bathtub is completed or interrupted, an operation amount equal to the integrated value and in the opposite direction is applied to the water throttle valve and the standby is performed. Return operation control means for returning to the position A water heater comprising: a water heater; 2. The water throttle valve driving means is a water throttle valve motor for adjusting an opening degree of the water throttle valve by driving a motor, and the integrated value calculating means calculates a voltage ratio applied to the water throttle valve motor. It is obtained at a predetermined time interval, changing the sign of the voltage ratio in the direction in which the water throttle valve opens and the voltage ratio in the direction in which the water throttle valve is closed, and obtaining the sum thereof as an integrated value.The return operation control means, The return voltage ratio sufficient to quickly operate the water throttle valve motor has the opposite sign to the integrated value, and the product of the integrated value and the time interval is divided by the return voltage ratio. The voltage is applied for a time equal to the value, or is applied until the sign of the integrated value is inverted while continuing the integration by the integrated value calculating means, or is applied until the fully open / closed position is reached. Claim 1 Water heater described. 3. A water hammer preventing operation control means for gradually reducing the opening of the water throttle valve and then closing the hot water supply valve when the hot water supply to the bath tub by the bath hot water supply system is completed or interrupted. The water heater according to claim 1 or 2, wherein: 4. When the tapping is performed during the return operation of the water throttle valve by the return operation control means, the return operation is interrupted, and the water throttle valve according to the tapping method is immediately stopped. 4. The water heater according to claim 1, further comprising intermittent operation control means for shifting to said control. 5. A water throttle valve for regulating a maximum flow rate of water flowing through a heat exchanger, and a water throttle valve driving means for adjusting an opening degree of the water throttle valve, wherein the water flowing through the heat exchanger is supplied to a gas burner. A general hot water supply system for heating the hot water from the hot water supply pipe, and a bathtub hot water supply system that is provided branched from the general hot water supply system and supplies hot water heated by the heat exchanger to the bathtub by opening a hot water supply valve; A dryer water injection system for injecting water flowing through the general hot water supply system into a dryer in a bathroom by an opening operation of the hot water supply valve; and, when pouring water into the dryer, after fully closing the water throttle valve, the hot water supply valve. Then, the water throttle valve is opened to pour water into the drier, and when the water supply to the drier is completed or interrupted, the water supply control means for closing the hot water supply valve, and the water at the time of general hot water supply. Set the throttle valve position to the standby position and When the water throttle valve is controlled at the time of or when water is injected into the dryer, an integrated value calculating means for calculating an integrated value of the operation amount of the water throttle valve based on the standby position; Return operation control for returning to the standby position by applying an amount of operation equal to the integrated value and in the opposite direction to the water throttle valve when the control of the water throttle valve at the time of water injection is terminated or interrupted. And a water heater. 6. The water throttle valve driving means is a water throttle valve motor for adjusting an opening degree of the water throttle valve by driving a motor, and the integrated value calculating means calculates a voltage ratio applied to the water throttle valve motor. It is obtained at a predetermined time interval, changing the sign of the voltage ratio in the direction in which the water throttle valve opens and the voltage ratio in the direction in which the water throttle valve is closed, and obtaining the sum thereof as an integrated value.The return operation control means, The return voltage ratio sufficient to quickly operate the water throttle valve motor has the opposite sign to the integrated value, and the product of the integrated value and the time interval is divided by the return voltage ratio. The voltage is applied for a time equal to the value, or is applied until the sign of the integrated value is inverted while continuing the integration by the integrated value calculating means, or is applied until the fully open / closed position is reached. Claim 5 Water heater described. 7. A water hammer prevention operation control means for gradually reducing the opening of the water throttle valve and then closing the hot water supply valve when the hot water supply to the bath tub by the bath hot water supply system is completed or interrupted. The water heater according to claim 5 or 6, wherein: 8. When tapping or water injection is performed during the return operation of the water throttle valve by the return operation control means, the return operation is interrupted, and the return operation is immediately performed according to the tapping or water injection method. 8. The water heater according to claim 5, further comprising intermittent operation control means for shifting to control of the water throttle valve.