JPH0160749B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention is an automatic adjustment method for mixing supplied hot water and cold water to obtain hot water at a desired set temperature in residential or commercial hot water supply equipment. This relates to hot water supply systems.

[Conventional technology]

2. Description of the Related Art Conventionally, automatic temperature control hot water supply systems for obtaining hot water at a desired temperature are generally shown in FIGS. 2 and 3.

In the system shown in Fig. 2, hot water obtained from a heat source 1 such as a hot water boiler or oil water heater, and cold water led from a water pipe are passed through a hot water pipe 2 and a cold water pipe 3 to a manual mixing valve 4. The valve 4 is used to supply hot water at a desired temperature.

The one shown in FIG. 3 uses a proportionally controlled gas water heater 5 as a heat source, and the gas amount of the gas water heater 5 is adjusted in proportion to the hot water temperature set value signal j set by the controller 6. is determined, hot water at a desired temperature is obtained, and this is supplied to the flow rate control valve 8 via the hot water piping 7. In this case, the flow rate control valve 8 only controls the discharge flow rate of hot water.

[Disadvantages of conventional technology]

However, in the hot water supply system shown in FIG. 2, the temperature is set by changing the mixing ratio of hot water and cold water supplied to the mixing valve 4.
There is a drawback that the set temperature changes depending on the temperature of hot water and cold water and the supply pressure of hot water and cold water, and readjustment is necessary. In particular, while using other hot water equipment, for example, the mixing valve 4 located in the bathroom, the mixing valve 4 located in the kitchen
When using a bathroom, the water supply pressure drops extremely and the temperature of the hot water discharged from the mixing valve 4 used in the bathroom rises to a dangerous temperature. Further, the temperature setting had to be done manually by rotating the knob of the mixing valve 4, which was troublesome. Additionally, there was no safety mechanism to close the valve if the hot water being discharged deviated significantly from the set temperature, and there was a risk that only hot water would be discharged if the cold water supply was cut off.

In addition, in the hot water system shown in FIG. 3, hot water at a desired temperature is obtained by a proportional control type gas water heater 5, and hot water piping 7 from the gas water heater 5 to the flow control valve 8 is connected. The longer the overall length, the greater the heat loss in the conduit. This means that hot water at the desired temperature cannot be obtained in places where hot water is actually used, and is also unfavorable from the standpoint of energy conservation. In addition, when reusing it, the desired hot water cannot be obtained from the flow rate control valve 8 until after the accumulated water in the hot water pipe 7 is discharged, and due to the characteristics of the gas water heater 5, it is difficult to There was a problem that hot water was discharged during temperature adjustment, and there were drawbacks such as wasted water volume and slow control time. This is particularly inefficient and wasteful when small amounts of hot water are required. Furthermore, the hot water system using the proportional control type gas water heater 5 has the disadvantage that hot water cannot be supplied to multiple locations. This is because it is impossible to individually determine the set temperatures at multiple locations. For this purpose, multiple gas water heaters are required.

[Means for solving problems]

The present invention improves and eliminates the above drawbacks of the conventional technology, and by controlling the rotation angle of the valve via a motor, the mixing ratio of hot water and cold water to be supplied separately is determined. An appropriate temperature mixer that obtains hot water adjusted to an appropriate temperature, and a temperature-sensitive sensor and a pressure-sensitive sensor that are installed in the vicinity of the appropriate temperature mixer in each pipe line of hot water and cold water that supplies the appropriate temperature mixer. , and a controller that determines the rotation angle of the valve of the appropriate temperature mixer based on the hot and cold water temperatures, pressure signals, and desired set temperature signals from these temperature-sensitive and pressure-sensitive sensors to create an automatic temperature-controlled water supply system. By configuring
The objective is to provide a hot water supply system that achieves highly accurate temperature control, eliminates the need for troublesome mixing operations, and furthermore reduces energy loss.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described in more detail below based on embodiments shown in the drawings.

〔Example〕

FIG. 1 is a block diagram showing the entire hot water supply system according to the embodiment. In the figure, 10 is a suitable temperature mixer that mixes cold water supplied from a cold water pipe 11 and hot water supplied from a hot water pipe 12 to obtain hot water at a suitable temperature, and 13 is connected to the mixer 10 and its valve. These are stepping motors, pulse servo motors, and other motors that control the rotation angle of the motor. In the cold water pipe 11, a check valve 14, a pressure sensor 15, and a temperature sensor 16 are arranged at a position upstream of and close to the appropriate temperature mixer 10. This arrangement is the same for the hot water pipe 12, where 17 is a check valve and 18 is a check valve.
19 is a pressure-sensitive sensor, and 19 is a temperature-sensitive sensor. The check valve 14 is for preventing hot water from flowing into the cold water pipe 11 so that the pressure sensor 15 and the temperature sensor 16 are not affected by the hot water. The check valve 17 also serves to prevent hot water from flowing into the hot water pipe 12 for the same reason.

Further, 20 indicates a signal a from each sensor 15, 16, 18, 19 of the cold water pipe 11 and the hot water pipe 12.
d to d and the set value signal e from the temperature setting device 21, the mixture ratio of cold water and hot water is calculated, and the control signal f is output to the motor 13 so as to achieve the mixture ratio, and the rotation angle of the valve of the appropriate temperature mixer 10 is adjusted. This is the controller that determines the The set value signal e of the temperature setting device 21 is simultaneously outputted to the display 22, and is displayed digitally on the display 22.

23 is a hot water pipe connecting the appropriate temperature mixer 10 and the flow rate control valve 24, and 24 is a safety valve such as a power failure automatic closing type electromagnetic valve or a safety thermostat placed in the middle of the hot water pipe 23. If this safety valve 24 is a power outage automatic closing type solenoid valve,
It is controlled by the controller 20, and if it is a safety thermostat, it automatically operates by detecting the temperature of hot water. Further, a temperature sensor 26 is arranged in the middle of the hot water pipe 23. This temperature sensor 26 outputs a hot water temperature signal h to the above-mentioned controller 20, and when an error of ±1° C. occurs between the signal h and the set value signal e, the signal h is output. The purpose is to control the appropriate temperature mixer 10.

The above-mentioned hot water system is installed as a single unit in a bathroom, kitchen, etc.
It is compact.

Next, the operation mode of the hot water supply system configured as described above will be explained.

First, a desired temperature of hot water is set using the temperature setting device 21. This set value signal e is sent to and displayed on the display 22, and is also sent to the controller 22.
Sent to 0. In addition to the signal e, pressure signals a, c and temperature signals b, d of cold water and hot water detected in the cold water pipe 11 and the hot water pipe 12 are constantly input to the controller 20. controller 20
calculates the respective heat capacities of cold water and hot water from these pressure and temperature signals, and determines the mixing ratio of both fluids so that the set temperature (value of signal e) can be achieved when both fluids are mixed. Then, a control signal f is output to the motor 13. The motor 13 receives a control signal f
The rotation angle of the valve of the appropriate temperature mixer 10 is adjusted based on the following. Thereby, the flow rate ratio of cold water and hot water flowing into the mixing chamber of the appropriate temperature mixer 10 becomes the value determined by the controller 20, and hot water at the set temperature is obtained.

Normally, hot water at a set temperature is obtained in this way. With this, even if the supply pressure and temperature of cold water and hot water change, the controller 20 will automatically correct the mixing ratio of cold water and hot water in a continuous manner to correct the temperature change of hot water due to this change. However, it is possible to always obtain hot water that is adjusted to the set temperature. In addition, the above-mentioned control is a feed forward control, and there may be almost no time delay in signal processing in the control.

Further, the hot water supply system according to the present invention uses the temperature sensor 26 to check whether the temperature of the hot water adjusted in the above-described manner is a desired set temperature. If an error of ±1°C or more occurs between the actual hot water temperature and the set temperature, the hot water temperature control by the above-mentioned sensors 15, 16, 18, and 19 will be changed to the hot water temperature control by the temperature sensor 26. temperature control. The occurrence of the error can be detected by constantly comparing the temperature signal h of the temperature sensor 26 and the setting signal e of the temperature setting device 21. Further, temperature control by the temperature sensor 26 may be performed using a feedback method.

In short, the hot water supply system according to the present invention uses a two-stage control system and is highly reliable.

When the functions of the controller 20 and each sensor stop due to a power outage, etc., the controller 20 outputs a stop signal g to the safety valve 25, and stops discharging hot water whose temperature is not controlled. Furthermore, if the supply of cold water is cut off due to a water outage or the like, only hot water will be discharged, which is dangerous, so the controller 20 outputs a cutoff signal g to the safety valve 25 in such a case as well. Detection of a water outage, etc. can be done by detecting that the pressure signal a of the pressure sensor 15 has fallen below a predetermined value, and is extremely easy. When a thermostatic valve is used as the safety valve 25, it is possible to prevent hot water discharge accidents by closing the valve itself at the same time as hot water is detected.

In addition, the above-mentioned hot water supply system is compact, as it can be installed as a single unit in a bathroom, kitchen, etc., as described above. Therefore, the hot water pipe 2 regulated by the appropriate temperature mixer 10
3 is extremely short, and the heat loss of hot water in the pipe 23 is almost negligible. In other words, it is preferable in terms of energy saving.

By the way, the present invention is not limited to the above-described embodiments, and can be modified as appropriate. For example, the hot water piping 12 may include an electric water heater, an oil water heater,
It may be formed using a dedicated pipe from a heat source such as a gas water heater or a solar system, or it may be formed using a branch pipe from a main pipe communicating with the above-mentioned heat source.

〔Effect of the invention〕

As explained above, the hot water supply system of the present invention has
It is an automatic temperature control type, eliminating the need for troublesome mixing operations. In addition, pressure-sensitive sensors and temperature-sensitive sensors placed in the cold water pipes and hot water pipes can continuously calculate the heat capacity of cold water and hot water to automatically control the mixing ratio of cold water and hot water to a predetermined temperature. can. Therefore, even if there are fluctuations in the supply pressure and temperature of cold water and hot water, it is possible to adjust the temperature of the hot water to a desired set temperature. That is,
Highly accurate temperature control is possible. In addition, the above-mentioned control is a feed-forward method, and there is no time delay in control. Furthermore, the hot water supply system of the present invention has the following features:
It does not utilize the characteristics of a certain type of heat source, but can be used with any heat source. Furthermore, when hot water is to be supplied to multiple locations, it is only necessary to arrange multiple hot water supply systems, and multiple heat sources are not required. Furthermore, in the hot water supply system of the present invention, the temperature is controlled just before hot water is discharged, so the pipe line for hot water adjusted to an appropriate temperature is extremely short, and there is almost no heat loss in the hot water in this section. That is, it is preferable in terms of energy saving.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a hot water supply system showing one embodiment of the present invention, and FIGS. 2 and 3 are block diagrams showing conventional hot water supply systems, respectively. 13... Motor, 10... Appropriate temperature mixer, 11
...Cold water piping, 12...Hot water piping, 15, 18...
...Pressure sensor, 16,19...Temperature sensor,
20...controller.

Claims (1)

[Claims] 1 By controlling the rotation angle of the valve via a motor, the mixing ratio of separately supplied hot water and cold water is determined, and the appropriate temperature mixer obtains hot water adjusted to the appropriate temperature, and the heat supplied to the appropriate temperature mixer. In each of the water and cold water pipes, a temperature sensor and a pressure sensor are installed close to the appropriate temperature mixer, and the temperature of the hot water and cold water from these temperature sensors and pressure sensors, An automatic temperature control hot water supply system comprising: a controller that determines a rotation angle of a valve of the appropriate temperature mixer based on a pressure signal and a desired set temperature signal.