JPH0336460A - Protection of pressure sensor of automatic bath with hot water supplying apparatus - Google Patents

Abstract

PURPOSE:To prevent an excess pressure from being applied to a pressure sensor by shutting OFF between a circulation additional combustion conduit and a pressure sensor chamber before water flows to the conduit when the wafer flows to the conduit. CONSTITUTION:A pressure sensor chamber 10 is connected to a circulation additional combustion conduit 5 through a directional control valve 9, and a pressure sensor 8 is disposed in the chamber 10. The valve 9 may switch between a state for shutting OFF the chamber 10 from the conduit 5 to communicate with the conduit and a state for communicating the chamber 10 with a bathtub 12. When water flows to the conduit 5, the valve 9 is so controlled as to shut OFF the chamber 10 from the conduit 5 before the water flows to the conduit 5.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention fills a bathtub with hot water from the appliance body via a circulation reheating conduit, and detects the water level in the bathtub with a pressure sensor. , an automatic water heater that automatically stops filling the bathtub when it detects that the water level has reached the set water level, and reheats the bathtub by circulating the hot water in the bathtub through the circulation reheating pipe as necessary. The present invention relates to a pressure sensor protection method for a bath device.

[Conventional technology]

A conventional example of the above-mentioned automatic bath device with water heater is No. 611i.
11, this device includes a hot water supply heat exchanger 1 and a reheating heat exchanger 2 in the appliance body, and the hot water supply heat exchanger 1
A branch pipe branched from the hot water outlet pipe 3 and having a pouring solenoid valve 4 is connected to @III reheating reheating 5, and the reheating solenoid valve 6, pump 7 and pressure sensor 8 are connected to the circulating reheating pipe. The bathtub is filled with hot water via one of the fmQ reheating paths by closing the reheating solenoid valve 6 and opening the hot water pouring solenoid valve 4.

That is, conventionally, as shown in FIG. 7, when the automatic switch is turned on, the solenoid valve 4.6 is opened to pour molten water (water) to bleed air from the piping, and then the solenoid valve 4.
(1) Then, while the reheating solenoid valve 6 is closed, the hot water pouring solenoid valve 4 is opened, and in this state, the water level in the bathtub is detected by the pressure sensor 8, and hot water is poured up to the set water level, and the hot water is poured into the bathtub. When it is detected that the water level has reached the set water level, the solenoid valve 4.6 is closed, then the reheating solenoid valve 6 is opened while the pouring solenoid valve 4 is closed, and the pump 7 is driven to perform reheating operation. When it is detected that the temperature of the water in the bathtub has reached a set temperature, the pump 7 is stopped and the reheating solenoid valve 6 is closed. It should be noted that this type of automatic bath device is automatically operated as described above by a microcomputer control section (not shown).

[Problems to be Solved by the Invention] However, pressure sensors generally have low pressure resistance, and conventionally the pressure sensor is directly connected to the circulation reheating pipe 5, so excessive pressure is generated when starting and stopping the circulation reheating. The problem is that excessive pressure is applied directly to the pressure sensor, and excessive pressure is applied to the pressure sensor due to the water hammer phenomenon that occurs when the pouring solenoid valve 4 and/or the reheating solenoid valve 6 are opened and closed, which adversely affects the pressure sensor. There is a point.

The present invention improves the problems of the prior art as described above and protects the pressure sensor by preventing excessive pressure from being applied to the pressure sensor at any time. We aim to provide the following.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides the W*
A pressure sensor chamber is connected to the reheating pipe via a switching valve, and a pressure sensor is installed in the pressure sensor chamber, and when there is water flowing in the circulating reheating pipe during reheating, etc. The present invention is characterized in that the circulation reheating conduit and the pressure sensor chamber are shut off by a switching valve before the water flows.

According to another aspect of the present invention, in the pressure sensor protection method, the pressure sensor chamber is provided with means for alleviating a pressure rise in the chamber.

[Effect]

As described above, when there is water flowing in the circulation reheating pipe, the circulation reheating pipe and the pressure sensor chamber are shut off by the switching valve before the water flows. No pressure is applied.

Also, in that case, the pressure sensor chamber is sealed, so
It is expected that the hot water in the pressure sensor chamber will be heated and the pressure in the pressure sensor chamber will increase due to thermal expansion. can be prevented.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In Figures 1 and 2, 1 is a heat exchanger for hot water supply;
is a heat exchanger for reheating, 4 is a solenoid valve for pouring hot water, 5 is a circulation reheating pipe, 6 is a reheating solenoid valve, and 7 is a pump 0 In the present invention, a switching valve is provided in the circulation reheating pipe 5. A pressure sensor chamber 1o is connected via a pressure sensor 9, and a pressure sensor 8 is disposed in the pressure sensor chamber.

In the illustrated embodiment, a three-way ball valve that is switched by a gear motor 11 is shown as the switching valve 9, but the present invention is not limited to this embodiment, and the pressure sensor chamber 1o is shown in FIG. As shown in FIG. 2, there is a state where the circulation reheating pipe is disconnected from the circulation reheating pipe 5 and communicated with it (hereinafter, this state is referred to as the circulation side), and a pressure sensor chamber is communicated with the bathtub 12 as shown in FIG. (hereinafter, this state will be referred to as the pressure detection side) is sufficient.

In the present invention, when there is water flowing in the circulation reheating pipe 5, the switching valve 9 is controlled to be switched so as to cut off the pressure sensor chamber 10 from the circulation reheating pipe 5 before the water flows. do.

That is, as shown in Fig. 3, when the reheating switch is turned on, the switching valve 9 is first switched to the *m side, then the molten metal pouring solenoid valve 4 is closed, the reheating solenoid valve 6 is opened, and the pump 7 is turned on. Perform reheating operation.

When the reheating operation is finished, the pump 7 is stopped, the reheating solenoid valve 6 is closed, the switching valve 9 is switched to the pressure detection side, and the water level in the bathtub is monitored by the pressure sensor 8.

Furthermore, when the automatic operation switch is turned on, the switching valve 9 is switched to the circulation side and the solenoid valve 4.
Open and pour xQ of molten metal (
water), close the solenoid valve 4゜6, and then close the switching valve 9.
is switched to the pressure detection side (Fig. 2) and the pouring solenoid valve 4 is switched to the pressure detection side (Fig. 2).
The water level in the bathtub is detected by the pressure sensor 8, and hot water is poured into the bathtub via the outgoing pipe of the ring reheating pipe 5, and the pressure sensor 8 detects that the water level in the bathtub has reached the set value. Then, the solenoid valves 4 and 6 are closed, the switching valve 9 is switched to the circulation side, and the reheating solenoid valve 6 is opened, and the pump 7 is driven to perform reheating operation, and the water temperature in the bathtub reaches the set value. When a hot water temperature detector (not shown) detects this, the pump 7 is stopped and the reheat solenoid valve 6 is closed, and then the switching valve 9 is closed.
Switch to the pressure detection side to monitor the bathtub water level.

FIG. 5 shows a specific example of a pressure sensor chamber having the switching valve. In Fig. 5, 10' is a housing that constitutes a pressure sensor chamber;
a, 10b, and its connection port 10a.

A switching valve 9 is disposed at the intersection of 10b via an O-ring, and the pressure sensor chamber 10 is isolated from the circulation side by the gear motor 11 (FIG. 5) and the connecting mill IQa.

10b, the two opposing walls of the pressure sensor chamber are cut out, the pressure sensor 8 is attached to one of them, the other is covered with a diaphragm 13, and an air hole 14' is provided. A spring 15 is disposed between the diaphragm cover 14 and the diaphragm 13, and when the pressure in the pressure sensor chamber 10 increases, the diaphragm 13 bends against the spring 15 to alleviate excessive pressure rise in the pressure sensor chamber 10. Let them do it.

(Effects of the Invention) As described above, according to the present invention, when there is water flowing in the circulation reheating pipe, the circulation reheating pipe and the pressure sensor chamber are shut off before the water flows, and the pressure sensor is connected to the circulation reheating pipe and the pressure sensor chamber. Application of excessive pressure can be prevented, and in that case, when the pressure in the sealed pressure sensor chamber increases, the pressure increase mitigation means can prevent excessive pressure increase.

[Brief explanation of drawings]

Figures 1 and 2 are water system diagrams showing an example of an automatic bath system with water heater to which the present invention is applied, Figure 3 is a flowchart for reheating operation, Figure 4 is a flowchart for automatic operation, and Figure 5 is a flowchart for automatic operation. It is a sectional view showing an example of a switching valve. FIG. 6 is a water system diagram showing an example of a conventional automatic bath device with a water heater, and FIG. 7 is a flowchart of its automatic operation. 1... Heat exchanger for hot water supply, 2... Heat exchanger for reheating,
4...Pouring solenoid valve, 5...Circulation reheating pipe, 6...
・Reheating solenoid valve, 7...pump, 8...pressure sensor,
9...Switching valve, 10...Pressure sensor chamber, 11...
gear motor.

Claims (1)

[Claims] 1. The bathtub is filled with hot water from the appliance body via the circulation reheating pipe, and the water level in the bathtub is detected by a pressure sensor, and the water level in the bathtub reaches a set water level. In an automatic bath device with a water heater, which automatically stops filling the hot water when detecting the hot water, and reheats the hot water in the bathtub by circulating the hot water in the bathtub through the circulation reheating pipe as necessary, the said circulation reheating pipe A pressure sensor chamber is connected through a switching valve, and a pressure sensor is installed in the pressure sensor chamber, and when there is running water in the circulation reheating pipe during circulation reheating, the circulation reheating is performed before the water flows. A pressure sensor protection method for an automatic bath device with a water heater, characterized in that a pipe line and a pressure sensor chamber are shut off by a switching valve. 2. The pressure sensor protection method for an automatic bath device with a water heater according to claim 1, characterized in that the pressure sensor chamber is provided with means for mitigating a pressure increase in the chamber.