JPH079303B2 - Water heater - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply device for a shower.

[0002]

2. Description of the Related Art The applicant of the present application previously filed Japanese Utility Model Application No. 60-1639.
As shown in FIG. 3, a shower hot water supply device is provided in which a shower tower body is provided with a plurality of shower outlets A as shown in FIG. 3, and the whole body can be covered with hot water without taking an uncomfortable posture by a switch operation. Proposed.

[0003]

However, in the above-mentioned conventional one, since the hot water that has passed through the hot and cold water mixing valve B is returned to the water supply side of the water heater through the return pipe C when the shower is not used, the temperature of the hot and cold water mixing valve is lowered. Therefore, as shown in FIG. 1, the return pipe is connected to the hot water mixing pipe upstream of the hot and cold water mixing valve, and a hot water discharge solenoid valve is provided downstream of the hot and cold water mixing valve. A configuration in which the solenoid valve is opened and hot water adjusted by the hot and cold water mixing valve is discharged can be considered. However, in such a configuration, the hot water in the hot water supply pipe between the hot and cold water mixing valve and the hot water discharge solenoid valve is cooled when the hot water is stopped, so it is necessary to drain the hot water supply pipe when it is not used for a long time while the hot water is stopped. As shown, a main solenoid valve is installed downstream of the hot and cold water mixing valve, and a drain pipe is connected to the hot water supply pipe between the main solenoid valve and the hot water discharge solenoid valve. It is necessary to drain the inside of the hot water supply pipe by closing the valve and then opening the direct-acting drainage solenoid valve and the hot water discharge solenoid valve provided in the drainage pipe in the drainage mode.

However, in the structure using the direct-acting solenoid valve described above, there is a residual pressure P in the hot water supply pipe between the original solenoid valve and the hot water discharge solenoid valve when the hot water is stopped, and this residual pressure P is shown in FIG. As shown in the figure, since it is added to the valve body B of the direct-acting solenoid valve A for drainage and hot water discharge, a large valve-opening operation force is required, and a small direct-acting solenoid valve cannot easily open it. A large direct-acting solenoid valve is required because problems such as unusability and drainage occur. On the other hand, as shown in FIG. 5, if the pilot-operated solenoid valve C is used instead of the direct-acting solenoid valve,
Since the plunger D can be moved without being affected by the residual pressure P even if the residual pressure P is present, the valve opening operation force is small, and the problem that the shower cannot be used does not occur even with a small pilot type solenoid valve. Moreover, although drainage can be easily performed, drainage is poor and residual water is discharged from the shower discharge port when reused. That is, in the pilot type solenoid valve, as shown in FIG. 5, when the opening F of the diaphragm valve body E is opened by the movement of the plunger D, the pressure in the valve chamber G is reduced and the diaphragm valve body E divides the pressure. The diaphragm valve element E is displaced toward the valve chamber G side to open the valve seat I due to the pressure difference between the two chambers G and H, but the head pressure J applied to the diaphragm valve element E due to the large amount of residual water during drainage. When it is large, there is no problem, but when the residual water amount becomes small and the head pressure becomes small, the pressure difference becomes small, the diaphragm valve body E closes the valve seat I, drainage stops, and residual water is generated. ..

[0005]

SUMMARY OF THE INVENTION The present invention is intended to solve such a problem. Therefore, in the present invention, a hot water supply main and a water supply main from a water heater are connected to a hot and cold water mixing valve. However, in the case where the main solenoid valve and the hot water discharge solenoid valve are installed from the hot and cold water mixing valve side between the hot and cold water mixing valve and the shower discharge port, and the drainage solenoid valve is installed in the drain passage communicating with the hot water supply passage between both valves. , The hot water discharge solenoid valve is configured by connecting a pilot type solenoid valve and a direct acting solenoid valve in parallel, and when the direct acting solenoid valve is closed, the original solenoid valve and the pilot type solenoid valve are opened and closed. Hot water is discharged from the shower outlet and stopped, and the direct-acting solenoid valve and drainage solenoid valve are opened after the pilot solenoid valve is opened during drainage while the hot water is stopped.

[0006]

In the present invention, the original solenoid valve and the pilot type solenoid valve are driven to open during hot water discharge so that the shower can be used from the shower discharge port, while both valves are closed when the hot water discharge is stopped, and the pilot type during drainage. After the solenoid valve is opened, the direct-acting solenoid valve and the drainage solenoid valve are opened, and the pilot-type solenoid valve is opened to release and reduce the residual pressure in the hot water supply passage. It becomes easy to open the valve.

[0007]

Embodiments of the present invention will be specifically described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a shower tower body installed and fixed in a bathroom, and a plurality of shower discharge ports 2, 3, 4, 5, 6 are provided in tandem on the surface of the tower body. The shower discharge ports are located on the slopes of both sleeves of the shower tower 1. 8,
Reference numerals 9 and 10 denote discharge switches provided in a part of the plurality of shower discharge ports and in the vicinity of the discharge ports, and are connected to a control circuit (not shown) for opening and closing the discharge of hot water. When it is turned on, the number of discharged hot water, that is, the discharge height can be designated.

Reference numeral 12 is a multifunctional shower discharge port such as an air massage shower, and 13 is a discharge port for pouring hot water.

Hot water and water are supplied to the shower tower body 1 by piping on the back side of the shower tower body 1. Reference numeral 14 is a cistern, and 15 and 16 are water heaters connected in series. 1
Reference numeral 7 is a water supply main pipe, 18 is a hot water supply main pipe, and 19 is a return pipe for returning hot water to the water supply side of the water heater. 21 and 22 are pumps, and 23 is a check valve. Reference numeral 24 is a hot and cold water mixing valve connecting the hot water supply main pipe 17 and the hot water supply main pipe 18, and a temperature detector 25 provided on the outflow side.
The hot water at the set temperature is controlled to flow out according to the detected temperature. Reference numeral 26 is an original solenoid valve, 27 is a drainage solenoid valve, and 28 is a flow control valve. The flow rate control valve 28 is controlled by the flow rate detected by the flow rate detector 29 to be a set flow rate.
Hot water is supplied to the shower discharge port 2 and the like from 8 through the hot water supply passage 30. Reference numeral 31 is a hot water outlet solenoid valve provided in each hot water supply passage 30. Reference numerals 33 and 34 denote a branch water pipe and a branch hot water supply pipe branched from the water supply main pipe 17 and the hot water supply main pipe 18, respectively. The branch water pipe 33 and the branch hot water supply pipe 34 detect the opening of the faucet connected to the end. There is provided a pressure switch 35 for opening and a flow rate switch 36 for detecting closure.

The operation of the hot water supply device described above is as follows. First, by turning on an operation switch installed in a kitchen (not shown), the pump 22 is driven and the hot water supply main pipe 18 and the return pipe 1
The hot water of the set temperature (70 ° C.) is circulated between 9 to be generated. When the hot water is stopped, the original solenoid valve 26 is closed, the drainage solenoid valve 27 is opened, and the direct-acting solenoid valve 31b described later is closed after being opened for a certain period of time. Therefore, the hot water supply passage after the original solenoid valve 26 is closed. It is drained. Next, for example, when using fog hot water, if fog hot water is selected and the hot water temperature and flow rate are set, the pump 21 moves, the pump 22 stops, the original solenoid valve 26 opens, and the drainage solenoid valve 27 closes. , Shower outlet 2
The pilot type solenoid valve 31a described later to 6 is opened, the hot water temperature is controlled by the hot water mixing valve 24 and the flow rate is controlled by the flow rate control valve 28 to a set value, and the shower temperature is supplied to the shower outlet. In the fog bath described above, the fog height at the time of fog can be set by operating the shower discharge switches 8 to 10.

FIG. 2 is a sectional view of the hot water discharge solenoid valve 31, which comprises a pilot type solenoid valve 31a and a direct acting solenoid valve 31b which are provided in parallel in the hot water supply passage 30. The pilot type solenoid valve 31a has a diaphragm valve body 51 for opening and closing a valve seat 50 formed in a single valve main body 49 having an inflow path 47 and an outflow path 48, and an opening 52 provided in the valve body 51 for energizing a coil 53. Plunger 54 driven and opened by
Consists of. Reference numeral 55 is an opening provided in the diaphragm valve body 51. The direct-acting electromagnetic valve 31b opens the valve seat 60 by opening and closing the valve seat 60 formed in the valve main body 49, and by mounting the valve body 61 and driving the coil 63 to energize it. It consists of a plunger 64. Reference numeral 67 is a controller that controls the loads of the solenoid valve, the pump, etc. described above.

To explain the above operation in more detail, when the fog hot water menu is selected, the pump 22 is stopped first, the pump 21 is driven, and the original solenoid valve 26 is opened and the drainage solenoid valve 27 is opened. Then, after the elapse of a certain time, the drainage solenoid valve 27 is closed, and the hot water supply passage 30 extending from the lower shower discharge port 6 to the shower discharge ports 2 to 4 having the height set by the shower discharge switches 8 to 10 reaches each shower discharge port. The pilot type solenoid valve 31a is sequentially energized and opened to perform fog hot water. Then, when the use of the cover water is stopped, the original solenoid valve 26 and the pilot solenoid valve 31a are first closed by a stop operation. When such a stopped state continues for a set time, one of the pilot solenoid valves 31a is opened, and then the drain solenoid valve 27 and the direct acting solenoid valve 31b are opened. By opening the valve, the residual pressure in the hot water supply passage 30 is reduced and the drainage solenoid valve 27
The direct-acting solenoid valve 31b is easily opened, and the accumulated water in the water passage after the original solenoid valve 26 is discharged from the drainage passage 66.

[0014]

As described above, according to the present invention, the main solenoid valve and the hot water discharge solenoid valve are provided between the hot and cold water mixing valve and the shower discharge port from the hot and cold water mixing valve side, and the drainage is communicated with the hot water supply passage between the two valves. Since the drainage solenoid valve is installed in the passage and the hot water discharge solenoid valve is configured by connecting the pilot type solenoid valve and the direct acting solenoid valve in parallel, Since the residual water in the hot water supply pipe from the solenoid valve to the shower outlet is drained, the residual water is reliably drained and there is no risk of the user being exposed to cold water during reuse, which is safe. In addition, since hot water is stopped and hot water is stopped by opening and closing the pilot solenoid valve, it is possible to prevent the occurrence of water hammer when hot water is stopped. Since the pilot type solenoid valve that can be opened with a small operating force is opened first, the back pressure applied to the valve body of the direct acting solenoid valve is released to reduce the opening force of the direct acting solenoid valve. The dynamic solenoid valve may be of a small size, and a hot water supply apparatus can be provided at a lower price compared to the case of using only a large direct drive solenoid valve for the hot water discharge solenoid valve.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a hot water discharge solenoid valve according to an embodiment of the present invention.

FIG. 3 is an overall configuration diagram showing a conventional example of the present invention.

FIG. 4 is a sectional view of a conventional direct acting solenoid valve.

FIG. 5 is a sectional view of a conventional pilot type solenoid valve.

[Explanation of symbols]

 2 Shower outlet 3 Shower outlet 4 Shower outlet 5 Shower outlet 6 Shower outlet 15 Water heater 16 Water heater 26 Original solenoid valve 27 Drainage solenoid valve 30 Hot water supply passage 31a Pilot type solenoid valve 31b Direct acting solenoid valve 66 Drainage Road

Claims (1)

[Claims] 1. A hot water supply main and a water supply main from a water heater are connected to a hot and cold water mixing valve, and an original solenoid valve and a hot water discharge solenoid valve are provided between the hot and cold water mixing valve and the shower outlet from the hot and cold water mixing valve side. However, in the case where a drainage solenoid valve is provided in the drainage path communicating with the hot water supply path between the two valves, the hot water discharge solenoid valve is constructed by connecting the pilot solenoid valve and the direct acting solenoid valve in parallel. With the dynamic solenoid valve closed, the main solenoid valve and the pilot solenoid valve were opened and closed to discharge and stop hot water from the shower outlet, and the pilot solenoid valve was opened during drainage while the hot water was stopped. A hot water supply device characterized by opening a rear direct acting solenoid valve and a drain solenoid valve.