JPS62206329A - Hot water supplying device - Google Patents

Abstract

PURPOSE:To enable a discharged hot water temperature to be adjusted arbitrarily and at the same time to prevent a freezing of the hot water by a method wherein the degree of opening of a valve is adjusted in response to a temperature setting signal and an automatic mixing valve to cause a lower temperature inlet port and a higher temperature inlet port to be connected to each other when a hot water discharging is terminated. CONSTITUTION:Water in a hot water unit 3 is boiled up while an operation switch 13 of a remote controlled device 15 is on, and the same time the degree of opening of an automatic mixing valve 4 is adjusted in response to a temperature setting signal set by a temperature setting unit 14. When a hot water is supplied, hot water of the hot water unit 3 and water in a water supplying pipe 10 are mixed by an automatic mixing valve 4, and the hot water maintained at a set temperature is fed to a hot water utilizing part 11 through a hot water supplying pipe 12. When an operation switch 13 is turned off, a control signal for terminating a hot water is supplied to a mixing valve control device 8 and a heating control device 16. Even under this condition, when it is necessary to prevent a freezing condition, the mixing valve control device 8 controls a valve body 4C at a position of connection between the low temperature inlet port 4A and a hot temperature inlet port 4B. With this arrangement, it is possible to prevent a freezing in the pipes 6, 7 or the automatic mixing valve 4.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a water heater that allows the temperature of hot water to be adjusted arbitrarily.

(B) Conventional technology A hot water supply system was developed in 1983 that installed an automatic mixing valve near the water heater, mixed the high temperature water from the water heater with city water, and then supplied the hot water to the user. It is disclosed in Japanese Patent No. 76045.

In the water heater described above, the valve opening of the automatic mixing valve is adjusted manually using the operating knob, so if the temperature is set to the low temperature side or the high temperature side, the automatic mixing valve's low temperature side inlet and high temperature side will be closed. There is no communication between the inlets, and convection from the water heater to the pipe connecting the automatic mixing valve stops. For this reason,
There was a concern that the water inside the automatic mixing valve and the piping that connects the water supply inlet of the water heater and the low-temperature side inlet of the automatic mixing valve would freeze in the winter, causing damage to these parts. Therefore, it is necessary to wrap an anti-freeze heater around these, which increases the cost of the device and 1! It was energy consuming and uneconomical. Also, the heater must be installed in an inappropriate location.

There was a problem that protection could not be achieved.

-1 Problems to be solved by the invention This invention was made in view of the above-mentioned facts,
The purpose of this invention is to economically and reliably prevent freezing of piping and automatic mixing valves that connect water heaters and automatic mixing valves.

B) Means for solving the problem In this invention, the water inlet and outlet of the water heater are connected by piping to the low-temperature side inlet and the high-temperature side inlet of the automatic mixing valve, respectively.
A water supply pipe is connected to the pipe between the water supply inlet and the low temperature side inlet of the automatic mixing valve, a hot water supply pipe is connected to the outlet of the automatic mixing valve, and the valve opening of the automatic mixing valve is adjusted according to the temperature setting signal. A mixing valve control device is provided that adjusts the valve opening of the automatic mixing valve so that the low-temperature side inlet and the high-temperature side inlet of the automatic mixing valve communicate with each other when the adjustment is made and a control signal to stop hot water supply is received. The configuration is as follows.

(e) Operation When the mixing valve control device adjusts the valve opening degree of the automatic mixing valve according to the temperature setting signal, the automatic mixing valve changes the inlet cover of the low temperature side inlet and the high temperature side inlet, and the hot water temperature at the outlet changes. to maintain the set temperature. For this reason.

When hot water supply starts, the hot water from the water heater and the water from the water supply pipe are mixed at the automatic mixing valve, and the hot water maintained at the set temperature is sent to the hot water usage section.

When a control signal to stop hot water supply is input to the mixing valve control device.

The mixing valve control device adjusts the valve opening of the automatic mixing valve so that the low-temperature side inlet and the high-temperature side inlet of the automatic mixing valve communicate with each other, regardless of the temperature setting signal. Therefore, if the water temperature in the piping or automatic mixing valve that connects the water heater and automatic mixing valve drops while the hot water supply is stopped, hot water from the water heater will be supplied to the piping and automatic mixing valve by convection, reliably preventing freezing. Ru. Also,
Since it uses the heat from the water heater, it is more economical than those that use a heater.

(F) Embodiments The present invention will be described in detail below based on embodiments shown in the drawings.

In Figure 1, there is a water supply port 1 at the bottom. A water heater 3 having a tap water outlet 2 at the top and an automatic mixing valve 4 are housed in an exterior case 5. The water heater 3 has a built-in heating device (not shown) that uses kerosene, gas, etc. as fuel.The water inlet 1 and outlet 2 of the water heater 3 are connected to the low-temperature side inlet 4A and the low-temperature side inlet 4A of the automatic mixing valve 4, respectively. It is connected to the high temperature side inlet 4B via piping 6.7.

In the automatic mixing valve 4, a motor 9 is driven by a mixing valve control device 8, and the motor 9 rotates a valve body 4C to adjust the valve opening between the low-temperature side inlet 4A and the high-temperature side inlet 4B. , preferably with a built-in wax thermostat. A water supply pipe 10 is connected to a pipe 6 that connects the water supply port 1 of the water heater 3 and the low temperature side inlet 4A of the automatic mixing valve 4. Further, a hot water supply pipe 12 leading to a hot water utilization section 11 is connected to an outlet 4D of the automatic mixing valve 4.

The hot water usage section 11 includes an operation switch 13 and a temperature setting device 1.
A remote control device 15 having 4 is provided. Further, inside the exterior case 50, a heating device (not shown) of the water heater 3 is controlled to turn on and off.

A heating control device 16 is provided to maintain the temperature of hot water in the water heater 3 at a predetermined temperature. The resocon device 15, the mixing valve control device 8, and the heating control device 16 are connected by remote control wires 17 and 18.

The mixing valve control device 8, as shown in FIG. .21 series circuit, an analog switch 22 which is controlled on and off by the input circuit 19 according to the on/off signal of the operation switch 130 of the remote control group [15], and a non-inverting input terminal connected to the input circuit via the analog switch 22. It is connected to the output terminal 23 of the resistor 19, and is also connected to the connection point 25 of the resistor 20 and 21 via the resistor 24, and the inverting input terminal is connected to the sliding part of the botehushi 1 meter 26 which is interlocked with the motor 9. It includes an amplification circuit 28 that includes a voltage comparator 27 and a motor drive circuit 29. The motor drive circuit 29 includes two voltage comparators fi+36.37 that compare the voltage at the output end 30 of the amplification circuit 28 and the potential at the intermediate connection point 34.35 of the resistors 31, 32, 33, and these blood pressure comparators 36.37. What are the relays 38 and 39 to which the output voltage of No. 37 is supplied, and the relay contacts 381 and 391 of these relays 38 and 39 and the direct connection terminals 40° 41 and 9 are connected as shown in the diagram. There is.

Note that the resistance 1vi of the resistor 24 is set to a sufficiently larger value than the output resistance of the input circuit 19.

When the operation switch 13 of the remote control device 1t15 is turned on, a control signal for starting hot water dispensing is sent from the remote control device 15 to the mixing valve control device [8 and the heating control device [16]. When the heating control device 16 receives a control signal to start dispensing hot water, it controls the heating device on and off, and heats the water in the water heater 3 to a high temperature (for example, 80℃).
Boil to (℃).

Further, in the mixing valve control device 8, the analog switch 22 is turned on, and the voltage at the output terminal 23 of the input circuit 19 according to the temperature setting signal from the remote control device 15 is transmitted to the non-inverting input terminal of the voltage comparator 27 via the analog switch 22. supplied to

When the temperature setting device 14 is operated 1- to the low temperature side, the input circuit 19
The potential at the output terminal 23 of the amplifying circuit 28 increases, and the potential at the output terminal 3 of the amplifier circuit 28 increases.
0 potential increases. Then, when the potential at the output end 30 exceeds the potential at the connection point 34, the voltage comparator 36
Turn on the current and close the relay contact 381. At this time,
Since the motor 9 is applied with a positive voltage and rotates in the positive direction, the valve body 4C of the automatic mixing valve 4 rotates clockwise, increasing the inflow amount of the low-temperature side inlet 4A, and increasing the inflow amount of the high-temperature side inlet 4B. Reduce the amount of inflow. Additionally, since the potential V of the sliding portion of the potentiometer 26 increases accordingly, the potential of the output end 30 of the amplification circuit 28 decreases. Then, when the potential at the output end 30 becomes lower than the potential at the connection point 34, the relay 38 is no longer energized and the motor 9 is stopped.

On the other hand, when the temperature setting device 14 is operated to the high temperature side.

The potential at the output terminal 23 of the input circuit 19 decreases. and,
When the potential at the output end 30 of the amplifier circuit 28 falls below the potential at the connection point 35, the relay 39 is energized.

A negative voltage is applied to the motor 9. At this time, the valve body 4C of the automatic mixing valve 4 rotates counterclockwise (one rotation) to reduce the size of the inflow cover of the low temperature side inlet 4A.

The inflow amount of the high temperature side inflow port 4B is increased. Also.

Since the potential V of the sliding portion of the potentiometer 32 decreases, when the potential of the output end 30 of the expansion port 128 exceeds the potential of the connection point 35, the relay 390 is de-energized and the motor 9 is stopped.

In this way, while the operation switch 13 of the remote controller 15 is turned on, the water in the water heater 3 is boiled to a high temperature, and the opening degree of the automatic mixing valve 40 is set to the remote controller 1.
It is adjusted according to the temperature setting signal from the temperature setting device 14 of No. 5. For this reason.

When hot water is supplied in the hot water usage section 11, the high temperature water from the water heater 3 and the water in the water supply pipe 10 are mixed at the automatic mixing valve 4, and the hot water maintained at the set temperature passes through the hot water supply pipe 12 to the hot water usage section. 1
Sent to 1. Further, as hot water is dispensed from the water heater 3, new water is supplied from the water supply pipe 10 to the lower part of the water heater 3.

When the operation switch 13 of the remote control device 15 is turned off,
A control signal to stop tapping the hot water is supplied to the mixing valve control device 8 and the heating control device 16. Even in this state, when freezing prevention is required, the heating control device 16 controls the heating device on and off so that the water in the water heater 3 is maintained at a certain temperature (for example, 30° C.) or higher. Further, in the mixing valve control device 8, the analog switch 22 is turned off, and the predetermined voltage at the connection point 25 is supplied to the non-inverting input terminal of the voltage comparator 27. At this time,
The mixing valve control device [8 rotates the motor 9 forward or reverse by energizing the relay 38 or 39, and places the valve body 4C at a certain position where the low-temperature side inlet 4A and the high-temperature side inlet 4B of the automatic mixing valve 4 communicate with each other. Control.

In this way, even if the operation switch 13 of the remote control device 15 is turned off, when freezing prevention is necessary, the tA water dispenser 3
The valve opening degree is adjusted so that the water in the pipe is kept at a relatively low temperature or higher, and the low temperature side inlet 4A and the high temperature side inlet 4B of the automatic mixing valve 4 communicate with each other. 6
．． γ or even if the water temperature in the automatic mixing valve 4 drops and there is a risk of freezing.

Outlet 2. Piping 7. The high temperature side inlet 4B and low temperature side inlet 4A of the automatic mixing valve 4, the piping 6 and the water supply port 1 are connected to the water heater 3 in this order.
The hot water is convected and can be prevented from freezing inside the pipes 6, 7 or the automatic mixing valve 4.

In the above-described embodiment, when the remote control device 15 supplies the control signal to stop the hot water output to the mixing valve control device 8, the mixing valve control device 8 controls the low-temperature side inlet 4A and the high-temperature side inlet 4B of the automatic mixing valve 4. However, the mixing valve control device 8 receives a control signal to stop hot water supply from the remote control device 15, and.

The communication control of the automatic mixing valve 40 may be performed when the water temperature in the pipes 6, 7 or the automatic mixing valve 4 falls below a certain temperature, or when the outside air temperature falls below a certain temperature. Furthermore, even when the heating control device tis receives a control signal to stop hot water from the remote control device 15, the water in the water heater 3 is maintained at a certain temperature or higher if freezing prevention is necessary. If the hot water has a large calorific value and the water heater is sufficiently insulated with heat insulating material, the heating device may remain stopped while hot water is not being dispensed.

(g) Effects of the invention This invention is configured as described above.

During hot water dispensing, the valve opening of the automatic mixing valve is adjusted according to the temperature setting signal, and hot water maintained at the set temperature can be supplied, and while hot water is not dispensing, the automatic mixing valve's low temperature can be maintained regardless of the temperature setting signal. The side inlet and the high temperature side inlet are communicated, and the hot water from the water heater is convected to the piping and automatic mixing valve to reliably prevent freezing inside these parts, making it possible to use an antifreeze heater. In comparison, it is economical, with lower equipment costs and lower operating costs, as well as improved reliability.

[Brief explanation of drawings]

FIG. 1 is a schematic structural diagram of a water heater according to an embodiment of the present invention, and FIG. 2 is an electric circuit diagram showing a specific example of a mixing valve control device used in the water heater of FIG. 1... Water inlet, 2... Hot water outlet, 3... Water heater. 4...Automatic mixing valve, 4A...Low temperature side inlet,
4B...High temperature side inlet, 4D...Outflow 0.6
, 7... Piping, 8... Mixing valve control device, 10...
・Water supply pipe. 12...Hot water pipe.

Claims (1)

[Claims] (1) Connect the water inlet and hot water outlet of the water heater to the low-temperature side inlet and high-temperature side inlet of the automatic mixing valve, respectively, and connect the water supply pipe to the piping between the water inlet and the low-temperature side inlet of the automatic mixing valve. , connect the hot water pipe to the outlet of the automatic mixing valve, adjust the valve opening of the automatic mixing valve according to the temperature setting signal, and when receiving the control signal to stop hot water output, the automatic mixing valve A water heater comprising a mixing valve control device that adjusts the valve opening of an automatic mixing valve so that a low-temperature side inlet and a high-temperature side inlet communicate with each other.