JPH02290440A - Hot water supplying apparatus - Google Patents

Abstract

PURPOSE:To promptly supply hot water of set temperature by regulating introduction of a hot water side opening operation of a hot water supply-to-water supply ratio control valve to a ratio control operation in response to supplying hot water temperature at the time of detection of start of hot water supplying by a hot water supply detector. CONSTITUTION:A ratio control valve 11 so controls the ratio of water amount to an electric hot water heater 16 to that to a bypass passage 21 as to become hot water temperatures set by temperature setters 28, 29 in a state that hot waters are supplied via cocks 26, 27. If the hot water is supplied again within a short period of time after the hot water supplying is stopped, a controller 30 judges that the supplying hot water temperature is not largely different from a set temperature and immediately controls a rate. After a predetermined period of time is elapsed after the stop of the hot water supply, the connection of the passage 21 to the heater 16 is disconnected by a ratio control valve 22, hot water of the heater 16 is supplied until time determined in response to the temperature of a hot water heater 25 or a predetermined temperature is obtained, and ratio control for setting the mixed hot water temperature as set value is thereafter performed. Accordingly, the hot water of temperature near the set temperature can be early supplied.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a water heater equipped with a drought ratio control valve capable of supplying hot water at any temperature level.

BACKGROUND TECHNOLOGY Conventionally, there was a water heater of this type as shown in Fig. 3. That is, in FIG. 3, the valve shaft 1 is moved forward and backward by the drive of the servo motor 1'. Reference numeral 2 denotes a double-sided valve on the hot water side for adjusting the amount of hot water. The double-sided valve 2 on the hot water side has a throttle passage hole 3 and is fixed to the tip of the valve shaft l. Reference numeral 4 denotes a water-side single-sided valve that adjusts the amount of cold water, and a spring 5 is interposed between it and the hot-water side double-sided valve 2, making it movable only in the direction of the hot-water side double-sided valve 2 with respect to the valve shaft l. . Further, 6 is one hot water side seat formed at the outlet of the hot water supply path 8 in the hot water side valve chamber 7, and 9 is a hot water side seat formed in the hot water side valve chamber 7 opposite to the hot water side seat 6. The other hot water side seat 9 is disposed between the hot water side valve chamber 7 and a mixing chamber 11 to be described later.

The hot water side double-sided valve 2 is installed between these two hot water side seats 6 and 9, and the hot water side double-sided valve 2 is installed by moving the valve shaft 1 forward and backward.
The two hot water side sheets 6 and 9 are in an inverse relationship of contact and separation, and the opening degree of each is adjusted. Reference numeral 10 denotes a water side seat formed at the outlet of the water supply channel 12 in the mixing chamber 11 which also serves as a water side valve chamber. It is designed to change the degree of contact and separation by adjusting the distance. Note that water whose pressure has been reduced by a pressure reducing valve 13 is supplied to the hot water supply path 8 after being heated by a heat exchanger l4 of the water heater. In other words, the water whose pressure has been reduced by the pressure reducing valve l3 is divided into the water supply channel 12 side and the heat exchanger 14 side of the water heater, and the flow ratio is adjusted by the hot water side double-sided valve 2 and the water side single-sided valve 4, and the water is mixed. Hot water and water are mixed in a chamber 11, and the hot water is supplied from a mixed hot water outlet 15 to a hot water supply target.

Problems to be Solved by the Invention Since the conventional water heater is configured as described above, when the hot water supply is stopped, the hot water stored in the heat exchanger 14 is transferred to the hot water supply path 8 and the mixing chamber 1L. , water supply channel 12
As the materials are cooled, the temperature gradually decreases due to natural circulation.

At the initial stage of cooling, the temperature in the hot water supply channel 8 and the water supply channel 12 is not much different from the temperature during hot water use, but when the temperature in the water supply channel 12 gradually rises due to natural circulation, hot water is reheated. If this is done, a temperature higher than the set temperature will be temporarily supplied, which is dangerous.

In addition, when hot water supply is resumed after a long period of time has passed and hot water supply channel 8 and water supply channel 12 have sufficiently cooled down due to natural heat radiation, water supply channel 12 is closed until hot water supply channel 8 is fully opened. It took time to reach the right temperature. In addition, if a certain amount of time has passed and the supply field temperature or water temperature changes temporarily during reheating, but it is predicted that the temperature will return to a constant level relatively soon, applying control may actually reduce the mixing temperature. It was predicted that there would be cases where it would be better to stop the control for a certain period of time because the temperature would fluctuate.

The present invention solves the above-mentioned conventional problems, and aims to provide a water heater that can quickly supply mixed hot water at a temperature close to the set temperature. Means for Solving the Problems In order to achieve the above object, the water heater of the present invention includes a hot water supply path and a ratio control valve that adjusts the ratio of hot water passing through the water supply path, a temperature detector that detects the temperature of the mixed water. , a temperature setting device that sets the mixing field temperature, a hot water supply detector that detects the presence or absence of hot water supply, and a ratio control valve is controlled by the signals from the temperature detector and temperature setting device, and the hot water supply detector detects the start of hot water supply. According to the temperature of the temperature detector at the time when the ratio control valve is opened, the controller determines how to enter the ratio control operation from the hot water side opening operation to the ratio control operation.

Operation With the above-described configuration, the hot water supply apparatus of the present invention detects the start of hot water supply with the hot water supply detector when restarting hot water supply, and if the temperature is sufficiently lower than the set temperature by checking the signal of the temperature detector, By temporarily keeping the hot water side open and entering normal ratio control operation after the cold hot water in the hot water supply path is discharged, mixed hot water at a temperature close to the set temperature can be quickly obtained.

Embodiment Next, an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 shows an example in which the present invention is applied to an electric water heater that uses late-night electricity.

Reference numeral 16 denotes a hot water supply heat source device, an electric water heater that uses late-night electricity, and is composed of a heater 17 and a hot water storage tank 18.

The electric water heater 16 has a water supply path 19. 19' and mixed hot water route 20. A hot water supply route 20' is connected thereto, and a bypass route 21 branches from the water supply route 19 and joins the mixed hot water route 20. At the branch point of the water supply route 19 and the bypass route 21, there is a ratio control valve 22 that adjusts the flow rate ratio of hot water and water.
is provided. 23 is a pressure reducing check valve, which reduces the water pressure and prevents hot water from flowing back into the water supply route in the event of a water outage. After the bypass path 2l of the mixed hot water path 20 joins, there are provided a flow rate switch 24 which is a hot water supply detector for detecting the presence or absence of hot water supply, and a temperature detector 25 for detecting the temperature of the mixed hot water after the field and water are mixed. It is being At the end of the mixed hot water path 20 is a faucet 26. 27 is connected, and the faucet 26. Near the point 27 is a temperature setting device 28 for setting the hot water temperature. 29 have been installed. Temperature setting device 28.
Priority and subordinate relationships are determined for 29, and if they are used simultaneously, hot water will be supplied according to the temperature setting of the priority side. The temperature setting Rif28, 29, and the signals from the temperature detector 25 and flow rate switch 24 are sent to the control device 30, and the control device 30 controls the ratio control valve 22 based on these signals.

The ratio control valve 22 is constructed as shown in FIG.

Water entering from the water supply route 19 is passed through the valve frame 3 on the water supply route 19' side leading to the electric water heater 16 and on the bypass route 21 side.
Branched within 1. Inside the valve body 3l, there is a hot water side valve body 3.
2 and a water-side valve body 33 are provided on a shaft 34, and are biased in the direction of expansion by a spring 35 to a regulated predetermined interval. The hot water side valve body 32 and the water side valve body 33 are connected to the shaft 34
The ratio of hot water to water is changed by being driven left and right in the figure by the drive unit 36. The drive section 36 includes a motor 37, a gear box 38 which is a speed reduction mechanism, and a threaded section 39 that converts rotational motion into linear motion. Further, 40 is a microswitch, which plays the role of stopping the driving of the hot water side valve body 33 and the water side valve body 34 after the closing point to prevent overshooting.

Next, the operation of this embodiment will be explained.

When the faucet 26 or 27 is open and hot water is being supplied, the flow rate switch 24 is activated and the temperature setting device 28 is activated.
Alternatively, the ratio control valve 22 controls the ratio of the amount of water supplied to the electric water heater 16 and the amount of water passing through the bypass path 21 so that the water temperature reaches the temperature set in step 29.

Specifically, the motor 37 is driven to a position where there is no temperature deviation between the set temperature of the temperature setter 28 or 29 and the temperature detected by the temperature detector 25, and the mixing ratio of hot water and water is adjusted. When all faucets are closed and hot water supply is stopped, the flow rate switch 24 detects the stoppage of hot water supply and holds the ratio control valve 22 at the hot water supply stop position for a predetermined period of time. If hot water is re-supplied within a short time after hot water supply is stopped, the control device 3 detects that the temperature detected by the temperature detector 25 is not significantly different from the set temperature.
0 makes the decision and immediately begins the operation of controlling the mixing ratio. Next, after a predetermined period of time has passed after stopping the hot water supply, the ratio control valve 22
is driven to cut off communication between the bypass path 21 and the electric water heater 16. That is, the ratio control valve 22 shown in FIG. 2 is driven leftward in the figure, and the water side valve body 33 is brought into contact with the valve seat and closed. Although the bypass path 21 and the electric water heater 16 form a loop composed of the water pipe 19° and the electric water heater 16, communication between the two is cut off by closing the ratio control valve 22. Therefore, it is possible to prevent heat radiation from the hot water in the hot water storage tank l8 due to natural heat radiation generated through the loop when hot water is not being supplied. Also, due to natural circulation, the bypass route 21
Even if the internal temperature rises, the mixed water temperature will not overshoot when hot water is reheated. When resupplying hot water after stopping hot water supply for a long time, opening the faucet 26 or 27 will cause
In this embodiment, since the high bath side 21 is closed when hot water supply is stopped, hot water in the electric water heater 16 flows, warming the previously cooled hot water supply path 20 and speeding up the supply of hot water to the faucet. The start of hot water supply is also detected by the flow meter 24, but after the hot water supply has started, a temperature sensor 25 is sent to the mixing field path 20.
Electric hot water 2316 is supplied for a predetermined time or until a predetermined temperature is obtained, and then,
Ratio control is applied to keep the original mixed water temperature at the set value. As described above, this embodiment speeds up heat dissipation when hot water is not used. Even if the hot water heating tA machine is an instantaneous type, by checking the temperature on the temperature sensor when restarting hot water supply, keeping the hot water side open for a while, and switching to normal ratio control operation when the temperature rises. , you can quickly reach the right temperature.

After a predetermined period of time has passed after the hot water supply has stopped, the ratio control valve 22
It is also possible to drive the hot water side or the water side in the direction of closing, leaving the path slightly open instead of completely closing it. in this case,
For example, cooling and freezing of the bypass pipe 21 in the winter can be prevented by raising the temperature to an appropriate level without overshooting during reheating. Furthermore, if the temperature of the hot water that is being supplied is predicted to rise rapidly, waiting without fully opening the hot water side allows the next ratio control operation to be started quickly while suppressing overshoot. In these cases as well, the manner in which the ratio control operation is entered can be changed depending on the signal from the temperature sensor.

In addition, in this embodiment, the flow rate Suinochi 24 is used as the hot water detector.
However, other hot water detectors include methods that use switches that turn on and off in conjunction with faucet operation, switch signals from valves that open and close in conjunction with switch operation, and methods that detect the internal pressure of the hot water supply path. There are means etc. Further, in this embodiment, the ratio control valve 22 is connected to the water supply path 19 and the bypass path 2.
1, but it may also be provided at the confluence of the hot water supply route 20° and the bypass route 21.

Effects of the Invention As described above, the water heater of the present invention includes a hot water supply path and a ratio control valve that adjusts the ratio of hot water supplied through the water supply path, a temperature sensor that detects the mixed water temperature, and a temperature sensor that detects the mixed water temperature. a temperature setting device to set the temperature, a hot water supply detector to detect the presence or absence of hot water supply,
The ratio control valve is controlled by the signals from the temperature detector and temperature setting device, and the hot water side opening operation of the duty control valve is performed according to the temperature of the temperature detector at the time when the hot water supply detector detects the stop of hot water supply. Since the present invention is equipped with a controller that adjusts how to enter the ratio control operation, it has the following effects.

(1) When hot water supply is restarted after a long period of discontinuation, the ratio control valve is held open on either the hot water side or the water side, and normal ratio control is resumed after a predetermined time or a predetermined temperature has been reached. Since the system starts operating, the water accumulated in the hot water supply piping can be discharged quickly, and the set temperature can be reached quickly.

(2) Since the entry into the normal ratio control operation is determined based on the temperature detected by the temperature detector, for example, after the hot water supply detector detects the start of hot water supply, the ratio control operation is performed for a predetermined period of time. Control can be performed more safely and reliably than with methods that do not perform

[Brief explanation of drawings]

FIG. 1 is a block diagram of a hot water supply system using a water heater according to an embodiment of the present invention, FIG. 2 is a sectional view of a ratio control valve used in the same device, and FIG. 3 is a conventional water heater system. FIG. 2 is a sectional view showing the JJJ device.

Claims (1)

[Claims] A hot water supply route connected to a hot water supply heat source device, a water supply route, a mixed hot water route where the hot water supply route and the water supply route are merged, and a ratio control that controls the ratio of hot water passing through the hot water supply route to water passing through the water supply route. A valve, a temperature detector that detects the mixed water temperature after hot water and water are combined and mixed, a temperature setting device that sets the mixed water temperature, a hot water supply detector that detects the presence or absence of hot water supply, and the temperature detector The ratio control valve is controlled by the signal from the temperature setting device, and the ratio is changed from the hot water side opening operation of the ratio control valve according to the temperature of the temperature sensor at the time when the hot water supply detector detects the start of hot water supply. A water heater equipped with a controller that adjusts how to enter a control operation.