JP2721544B2 - Pressure sensor protection device in automatic bath equipment with water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention fills a bath from a device main body to a bathtub via a circulation reheating line, and arranges a water level in the bathtub in the fill line. The present invention relates to a pressure sensor protection device in an automatic bath apparatus with a water heater, which stops the filling when the bath water level reaches a set water level.

[Conventional technology]

As described above, the pressure sensor for detecting the water level in the bathtub is a precision electronic component for detecting a minute pressure (for example, 0.2 to 0.75 kg) of the bathtub water level. However, the water supply pressure of the water supply is usually 3 kg, and 5 kg at high places.In addition, shock waves such as water hammer due to opening and closing of the solenoid valve arranged in the instrument are generated in the instrument. If an excessive pressure is applied, the measurement accuracy may be deviated or broken.

For this reason, conventionally, as shown in FIG. 3, an excessive pressure was not applied to the pressure sensor. That is,
In FIG. 3, 1 is an appliance body, 2 is a heat exchanger for hot water supply,
3 is a vacuum breaker provided in the pouring line, 4 and 5 are also check valves, 6 is a hot water supply solenoid valve, 7 is a reheating solenoid valve disposed in the circulation reheating line, 8 is a pressure sensor, and 9 is a pressure sensor. Heat exchanger for reheating,
10 is a circulation reheating pump, 11 is a circulation forward pipe, 12 is a circulation return pipe, 13 is a bathtub, 14 is a bathtub circulation fitting, and a reheating solenoid valve 7 is provided between the circulation reheating pump 10 and the pressure sensor 8. When the bath is filled with hot water, the supplementary heating electromagnetic valve 7 is closed and the hot water is filled only via the return pipe 12 of the supplementary heating circulation pipe.

That is, in the automatic bath apparatus shown in FIG. 3, when an automatic operation switch of a remote controller (not shown) is turned on, the additional heating electromagnetic valve 7 is opened and the hot water supply electromagnetic valve 6 is opened, so that the automatic bath apparatus is heated by the hot water supply heat exchanger 2. Hot water is supplied to the bathtub via the check valve 4, the vacuum breaker 3, the check valve 5, the hot water supply solenoid valve 6, and the pump 10, and during that time, the pressure sensor 8 detects the pressure of the circulation port containing air, When it is detected that the water level in the inside rises above the circulation fitting 14 and the circulation port pressure rises, the hot water supply solenoid valve 6 is closed and the supplementary heating solenoid valve 7 is opened, and the pump 10 is driven to drive the air in the supplementary heating pipe line. Drain, then reheat solenoid valve 7
Is closed, the hot water supply solenoid valve 6 is opened while the water level is detected by static pressure by the pressure sensor 8, and hot water is filled in the bathtub through only the return pipe 12 of the circulation reheating line, and the pressure sensor 8 is set. When it is detected that the water level has been reached, the hot water supply electromagnetic valve 6 is closed to terminate the filling of the set water level.

[Problems to be solved by the invention]

In the prior art, as described above, since air is evacuated while the hot water supply is temporarily stopped, air bleeding time is required in addition to the original hot water filling time, and only the return pipe of the circulation additional heating line ( The hot water has to be supplied through the outgoing pipe only), so the flow rate of hot water is restricted to prevent erosion, and the water can only be filled with a capacity lower than the capacity of the appliance. Requires a long time.

The present invention solves the problems of the prior art as described above, even if the water pressure of the appliance is increased by performing a large amount of pouring,
An object of the present invention is to provide a pressure sensor protection device in an automatic bath apparatus with a water heater, in which even if a water hammer occurs in the appliance due to opening and closing of an electromagnetic valve, there is no possibility that excessive pressure acts on the pressure sensor.

[Means for solving the problem]

In order to achieve the object as described above, the present invention connects an air tank to a part of a filling line and forms a venturi portion in the middle of the line from the filling line to the air tank. A pressure sensor is provided between the venturi section and the air tank.

[Action]

The present invention, as described above, connects an air tank to a part of a filling line, forms a venturi partway in the line from the filling line to the air tank, and connects the venturi part to the air tank. Since a pressure sensor is installed between the two, even if the amount of hot water is increased and the water pressure in the pipeline rises,
The venturi reduces the pressure and prevents high pressure from being applied to the pressure sensor.Also, even if a water hammer occurs due to the opening and closing of a solenoid valve, etc., the air in the air tank is compressed to absorb shock waves, and thus to the pressure sensor. High pressure can be prevented from being applied.

〔Example〕

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

FIG. 1 is a water system diagram showing an embodiment of the present invention, wherein 1 is an appliance body, 2 is a heat exchanger for hot water supply, 3 is a vacuum breaker, 4 and 5 are check valves, 6 is a hot water supply solenoid valve, 9 Denotes a heat exchanger for circulation reheating, 10 denotes a pump for circulation reheating, 11 denotes a circulation outgoing pipe, 12 denotes a circulation return pipe, 13 denotes a bathtub, and 14 denotes a bathtub circulation fitting. In the present invention, the use of the conventionally used additional heating electromagnetic valve is abolished, and when the hot water supply electromagnetic valve 6 is opened, the hot water supply electromagnetic valve 6 is introduced into the bathtub 13 via both the circulation outgoing pipe 11 and the return pipe 12. Venturi pipe 15 should be placed so that it can be filled with water, and
Attach the air tank to the small diameter part of the venturi tube 15.
The pressure sensor 8 is disposed between the air tank 16 and the venturi tube 15.

That is, FIG. 2 is an enlarged sectional view of a part A in FIG. 1 which is a main part of the present invention, and a branch detection tube including a connecting pipe 17, a joint fitting 18, and a connecting pipe 19 is provided in a small diameter portion of the venturi pipe 15. The air tank 16 having a required volume is connected to the end of the connection pipe 19, and the pressure sensor 8 is attached to the joint fitting 19. Reference numeral 20 denotes an O-ring interposed between the joint fitting 18 and the pressure sensor 8.

Although FIGS. 1 and 2 show an example in which a spherical air tank is used, the present invention is not limited to such an embodiment. For example, a tubular air tank may be used. Can also.

Since the pressure sensor protection device of the present invention is configured as described above, if a large amount of hot water is supplied by fully opening the hot water supply electromagnetic valve 6, hot water with a high water supply pressure flows through the hot water supply line. The pressure is reduced by the venturi tube 15 and the reduced supply pressure is applied to the pressure sensor 8, so that the pressure sensor can be protected. When the hot-water supply electromagnetic valve 6 is suddenly opened, a water hammer as shown in FIG. 4 is generated in the pipe. In the present invention, the pressure is reduced by the venturi pipe 15 and the air tank 16 is used.
By compressing the air inside, water hammer acting on the pressure sensor can be reduced as shown in FIG. 5, and when the hot water supply electromagnetic valve 6 is rapidly closed, the sixth
Although a water hammer as shown in the figure occurs, in the present invention, the water hammer acting on the pressure sensor can be reduced and reduced as shown in FIG.

The illustrated embodiment shows an example in which a flow control valve 21 is provided on the outlet side of the hot water supply heat exchanger 2. If the flow control valve is throttled when the hot water supply electromagnetic valve is opened and closed, the pressure sensor can be reduced. Can be more reliably protected.

〔The invention's effect〕

As described above, according to the present invention, even if the filling is performed by fully utilizing the outgoing pipe and the return pipe of the circulation additional heating pipe,
This prevents the pressure sensor from being applied with a pressure higher than the withstand pressure, shortens the time required for filling, and makes it possible to make full use of the hot water supply capability of the appliance to fill.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a water system diagram of an automatic bath apparatus with a water heater to which the present invention is applied, FIG. 2 is an enlarged sectional view of a portion A in FIG. 1, and FIG. 3 is a conventional water heater. It is a water system diagram of an automatic bath apparatus. FIG. 4 is a water hammer diagram in the pipe line when the hot water supply solenoid valve is opened, FIG. 5 is a pressure diagram applied to the pressure sensor in the case of FIG. 4, and FIG. 6 is a case where the hot water supply solenoid valve is closed. FIG. 7 is a pressure diagram applied to the pressure sensor in the case of FIG. 2 Heat exchanger for hot water supply, 6 Solenoid valve for hot water supply, 8 Pressure sensor, 15 Venturi tube, 16 Air tank.

Claims (1)

(57) [Claims] (1) Filling the bath from the appliance body to the bath tub via the circulation reheating line, detecting the water level in the bath tub by a pressure sensor arranged in the hot line, and setting the bath tub water level to the set water level. In an automatic bath apparatus with a water heater, which stops the filling when it is detected that an air tank has been connected, an air tank is connected to a part of the filling line, and a halfway of a line from the filling line to the air tank. A pressure sensor between the venturi and the air tank, wherein the pressure sensor is provided between the venturi and the air tank.