JPH1193239A - Volumetric changeover valve device for flush toilet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a volumetric changeover valve device for a flush toilet which is simply and inexpensively composed and can alternately flush a fixed quantity of water to the rim of a toilet seat and a lower jet nozzle. SOLUTION: This volumetric changeover valve device utilizes a supply water pressure from a city water pipe to alternately flush each fixed flow quantity of city water to the rim of a toilet seat and a lower jet nozzle. In this case, the changeover valve device is provided with pipe line valves 40A, B, 60A, B which are changed over by an electric control so as to selectively communicate with a main pipe 5 for passing through water supplied from the city water pipe with the rim and the lower jet nozzle and a fixed pressure valve 20 for regulating a water pressure in a pipe line 5' on the inlet side of the pipe line directional control valves 40A, B, 60A, B to a prescribed fixed pressure set by the energizing power of a spring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flush toilet fixed quantity switching valve device for alternately supplying a constant flow of tap water to a rim and a lower jet nozzle of a toilet using a supply water pressure from a water pipe. .

[0002]

2. Description of the Related Art In a so-called direct pressure type flush toilet that does not use a water tank, the supply water pressure from a water pipe is used for flushing the toilet. The so-called sequential valve system, in which tap water at a constant flow rate is alternately flowed to the lower jet nozzle,
In recent years, it has been widely adopted.

FIG. 19 is a piping diagram for supplying flush water of such a conventional fixed amount switching valve device of a flush toilet, and a manual water stopcock 102 and a check valve are provided in a water supply pipe 101 connected to a water pipe. A valve 103 is attached, and on the downstream side, a branch 104 is formed into a pipe 104 to a so-called washlet and a pipe (base pipe) 105 to a toilet.

The main pipe 105 is provided with a flow control valve 106 driven by a motor actuator with a clutch.
In parallel with this, a diaphragm valve 108 opened by a manual valve 107 in an emergency and a constant flow valve 109 are connected.

[0005] The main pipe 105 passes through a vacuum breaker 110 downstream of the flow control valve 106 and passes through a branch portion 11.
At 1 a branch is made into a conduit 112 to the rim and a conduit 113 to the lower jet nozzle.

A pressure sensor 114 for detecting the water pressure of the branch portion 111 is provided.
14 is sent to the control amplifier 115 to control the drive motor of the flow regulating valve 106,
The opening of the flow control valve 106 is automatically adjusted so that the water pressure at 11 becomes constant.

[0007] A conduit 112 to the rim opens at the rim via a vacuum breaker 116. Further, a solenoid driving diaphragm valve 117 is provided in a pipe line 113 to the lower jet nozzle, and communicates with the lower jet nozzle via a vacuum breaker 118 downstream thereof.

[0008] 119 is a line 1 to the lower jet nozzle
A diaphragm valve 120 that operates to close the conduit 112 to the rim by flowing water into the rim 13 is a manual valve for manually opening the solenoid-operated diaphragm valve 117 in an emergency.

[0009]

In order to allow a fixed amount of water to flow alternately between the rim of the toilet and the lower jet nozzle, even when the water pressure in the water pipe varies, the pipe line 112 to the rim and the lower jet nozzle are connected. It is necessary to control so that the water pressure in the pipeline 113 becomes constant.

Therefore, conventionally, as described above, the branch 111
Is detected by the pressure sensor 114, and the detection signal is sent to the control amplifier 115 to electrically adjust the opening of the flow control valve 106 so that the water pressure of the branch portion 111 is controlled to be constant. I have.

However, in order to merely control the water pressure when a constant amount of water is alternately supplied to the rim of the toilet and the lower jet nozzle, a pressure sensor, a control amplifier, a flow control valve driven by a motor actuator, etc. Requires a very complicated structure, and the manufacturing cost is high.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a flush toilet fixed quantity switching valve device capable of alternately flowing a fixed amount of water to a toilet rim and a lower jet nozzle with a simple and inexpensive configuration. .

[0013]

In order to achieve the above object, a fixed amount switching valve device for a flush toilet according to the present invention uses a supply water pressure from a water pipe to maintain a constant pressure on a rim and a lower jet nozzle of a toilet bowl. In a fixed amount switching valve device of a flush toilet for alternately flowing tap water at a flow rate, an electric power is supplied so that a main pipe through which water supplied from the water pipe passes is selectively connected to the rim and the lower jet nozzle. Line switching valve that is switched by dynamic control, and a constant pressure valve for regulating the water pressure in the inlet-side line of the line switching valve to a predetermined constant pressure set by the urging force of a spring. Features.

The pipeline switching valve has a first on-off valve for opening and closing a pipeline leading to the rim and a second on-off valve for opening and closing a pipeline leading to the lower jet nozzle. It may be.

[0015] The constant pressure valve may have a water stopping function for closing the main pipe when the downstream water pressure is higher than a predetermined pressure. Also, at least one of the first and second on-off valves is provided with an on-off valve closing spring set to close the on-off valve when the upstream water pressure of the on-off valve becomes lower than a predetermined pressure. May be.

The pipeline switching valve is disposed at a branch of the pipeline so as to selectively communicate either one of the pipeline leading to the rim and the pipeline leading to the lower jet nozzle with the main pipe. The main pipe opening / closing valve for opening and closing the main pipe may be separately provided.

[0017] At least one of the first on-off valve, the second on-off valve, the three-way valve and the main pipe on-off valve is
A diaphragm valve driven following the opening and closing of a pilot valve opened and closed by an electromagnetic solenoid may be provided.

In this case, at least one of the first on-off valve, the second on-off valve, and the main pipe on-off valve controls the flow rate of water flowing toward the pilot valve when the diaphragm valve is fully opened. A pilot flow rate regulating means for minimizing the necessary amount may be provided.

Further, the three-way valve selectively moves one of the conduit leading to the rim and the conduit leading to the lower jet nozzle to the upstream conduit by moving the spool valve in the axial direction. Communication may be provided.

Further, the main pipe opening / closing valve is disposed upstream of the constant pressure valve, and the main pipe is set so as to close the main pipe opening / closing valve when the water pressure in the main pipe becomes lower than a predetermined pressure. A closing spring may be provided.

Further, at least one of the first on-off valve, the second on-off valve, and the main pipe on-off valve is moved in response to the movement of the valve body to detect the open / closed state of the valve from outside. A permanent magnet may be provided.

Further, a manual valve opening mechanism for manually opening the valve may be provided in addition to the pilot valve opened and closed by the electromagnetic solenoid.

[0023]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a pipe for supplying toilet flush water of a sequential valve type flush toilet according to a first embodiment of the present invention.

A manual water stopcock 2 and a check valve 3 are attached to a water supply pipe 1 connected to a water pipe, and a pipe 4 to a so-called washlet and a pipe (base pipe) 5 to a toilet bowl are provided downstream thereof. And it is forked.

The main pipe 5 is branched into a pipe 12 to a rim and a pipe 13 to a lower jet nozzle at a branch portion 11. The water pressure in a pipe 5 ′ reaching the branch portion is maintained at a predetermined constant pressure. A constant pressure valve 20 for adjusting the pressure is provided in the main pipe 5.

The conduit 12 to the rim opens through the diaphragm valve 40A and the vacuum breaker 50A to the rim of the toilet, and the conduit 13 to the lower jet nozzle passes through the diaphragm valve 40B and the vacuum breaker 50B to the lower part of the toilet. Connected to jet nozzle.

Diaphragm valves 40A and 40B provided in a line 12 to the rim and a line 13 to the lower jet nozzle
Are controlled by solenoid driven pilot valves 60A and 60B, respectively. However, both solenoid driven pilot valves 60A and 60B can be manually operated in an emergency.

FIGS. 2 and 3 are a cross-sectional view and a vertical cross-sectional view, respectively, showing the configuration on the downstream side from the constant pressure valve 20. The constant pressure valve 20 is
Irrespective of the water pressure in the main pipe 5 on the inlet side, the water pressure in the pipe line 5 'reaching the branch on the outlet side is set to a predetermined constant value set by the effective pressure receiving area where the diaphragm 31 receives the water pressure and the urging force of the spring. FIG. 4 is an enlarged view of the configuration of a pressure regulating valve that regulates pressure.

The valve seat 21 of the constant pressure valve 20 is formed on an inner peripheral surface part of the part formed by bending the main pipe 5 into a crank shape, and the cylindrical valve body 22 is provided with a valve seat from the upstream side. 21.

An annular seal member 23 is mounted on the outer periphery of the valve body 22, and the seal member 23 is attached to the valve seat 21.
, The main pipe 5 is completely closed, and the water is stopped.

An outer peripheral surface of a portion near the rear end of the valve body 22 is fitted into a cylindrical portion formed in the main pipe 5, and the inside thereof is a pressure regulating chamber 24. As shown by the dashed arrow, the water on the upstream side of the main pipe 5 passes through the fitting portion, and
4 leaks little by little.

The valve element 22 is urged in a valve closing direction by a first compression coil spring 25 disposed in the pressure regulating chamber 24. Further, a pilot hole 26 for communicating a pipe line 5 ′ leading to a branch portion downstream from the valve seat 21 with the inside of the pressure regulation chamber 24.
A pilot valve 27 for closing the opening of
It is urged in the closing direction by the second compression coil spring 28 and disposed in the pressure regulation chamber 24.

On the downstream side of the valve seat 21, a diaphragm 31 made of a flexible member having an inner surface facing the conduit 5 'reaching the branch portion and an outer surface facing the atmosphere is provided. 32, and is arranged so as to partition between the inside of the pipeline and the atmosphere.

The diaphragm receiving board 32 is externally moved by a third compression coil spring 33 having a large wire diameter.
It is urged toward one side. In relation to the first compression coil spring 25, the third compression coil spring 33 has a water pressure Pa of 30K in the pipe line 5 'reaching the branch portion.
When the pressure is equal to or less than pa, it is set so as to overcome the water pressure and push the entire valve body 22 away from the valve seat 21 (FIG. 6).

Further, a leak hole 34 formed in the center of the diaphragm receiving plate 32 is closed from the outside so that the inside of the pipe line 5 'reaching the branch portion and the outside atmosphere leak.
The auxiliary valve 35 is a fourth compression coil spring 3 having a small wire diameter.
It is arranged to be biased at 6. The fourth compression coil spring 36 is provided with a hydraulic pressure Pa in the pipe line 5 'reaching the branch portion.
Is set to be lower than 60 Kpa so that the auxiliary valve 35 is opened by losing water pressure.

Although the spring force of the third compression coil spring 33 changes with the displacement of the diaphragm receiving plate 32, the spring force of the fourth compression coil spring 36 is not affected by the displacement of the diaphragm receiving plate 32. It is supported by.

A rod 37 loosely inserted into the pilot hole 26 is in contact with the pilot valve 27 at one end and in contact with the inner surface of the diaphragm receiving board 32 at the other end.
Therefore, the pilot valve 27 operates via the rod 37 due to the displacement of the diaphragm receiving plate 32, and the pressure regulating chamber 2
The space between the inside 4 and the conduit 5 'reaching the branching portion is switched between a shielded state and a communicating state.

The spring force of the third compression coil spring 33 depends on the effective pressure receiving area of the diaphragm 31 when the water pressure Pa in the pipe line 5 'reaching the branch is greater than 30 Kpa. Then, as shown in FIG. 4, it is set to retreat outward.

In this state, the pilot valve 27 is closed and the water pressure Pb in the pressure regulating chamber 24 is
It is the same as o (Pb = Po), and the seal member 23 is in close contact with the valve seat 21 and the main pipe 5 is closed.

Then, the water pressure P in the pipeline 5 'reaching the branch portion
When a becomes 30 Kpa, as shown in FIG. 5, the diaphragm receiving plate 32 moves inward to open the pilot valve 27, and the water pressure Pb in the pressure regulation chamber 24 reaches the branch portion via the pilot hole 26 to the branch portion. It becomes equal to the water pressure Pa in the path 5 '(Pb = Pa).

Since the outer diameter of the valve body 22 in the pressure regulating chamber 24 and the inner diameter of the valve seat 21 are formed to be the same size, the water pressure in the upstream main pipe 5 is affected by the operation during this period. Has no effect at all.

The water pressure P in the pipe line 5 'reaching the branch portion
When a becomes 30 Kpa or less, as shown in FIG. 6, the valve body 22 is pushed to the upstream side by the diaphragm receiving plate 32 and separates from the valve seat 21 to reach the upstream main pipe 5 and the downstream branch section. The road 5 'communicates.

In this way, regardless of the water pressure fluctuation in the upstream main pipe 5, only by the set load of the spring,
The water pressure in the pipe line 5 'reaching the branch portion is controlled to be constant at, for example, 30 Kpa.

FIG. 7 shows vacuum breakers 50A and 50B. A float valve 52 to which a disk-shaped sealing member 53 is attached is provided movably along a fixed shaft 51.

As a result, when water flows in the pipeline, the float valve 52 is pushed up in the direction of arrow B by the water pressure, and the seal member 53 contacts the valve seat 54 provided on the outer wall side of the pipeline. Flows through the pipeline without leaking to the outside.

When water does not flow through the pipeline, the float valve 52 descends to the state shown in FIG. 7 due to gravity, and as shown by the arrow A, the atmosphere enters the pipeline and negative pressure is introduced into the pipeline. Is prevented from occurring.

FIG. 8 shows diaphragm valves 40A and 40B. A diaphragm 41 made of a flexible member is fixed to a main valve body 42 at a portion other than a peripheral portion, so that a gap between the inside of a pipe and the atmosphere is provided. It is arranged in a partition state.

The pipe facing the main valve body 42 has an annular valve seat 4.
3 is formed, and an outer portion partitioned into a donut shape by the valve seat 43 communicates with the upstream branch portion 11,
The inner part is a conduit leading to the downstream vacuum breakers 50A, 50B.

A seal member 44 integrally formed with the diaphragm 41 is arranged in close contact with the back surface of the main valve body 42. When the seal member 44 comes into contact with the valve seat 43, the pipeline is closed. When the seal member 44 separates from the valve seat 43, water passes through the conduit.

The space facing the outer surface of the main valve body 42 is
5, a compression coil spring 46 for urging the seal member 44 in the direction of bringing the seal member 44 into contact with the valve seat 43 is disposed. The main valve body 42 is provided with a thin leak hole 47 communicating with the inside of the upstream pipe.

As shown in FIG. 2, the pressure regulating chamber 45 is provided with a solenoid driven pilot valve 6 through a pilot pipe 61.
The communication with the atmosphere is opened and closed by 0A and B.

As a result, as shown in FIG. 8, when the pressure regulation chamber 45 is closed from the atmosphere,
The seal member 44 is pressed against the valve seat 43 by the differential pressure between the pressure of the water on the upstream side leaking into the pressure regulating chamber 45 and the pressure of the water in the downstream pipe, so that the diaphragm valves 40A and B are closed. State.

Then, as shown in FIG.
5 is in communication with the atmosphere, the pressure in the pressure regulating chamber 45 is lower than the water pressure in the pipeline, so that the main valve element 42 is
And the diaphragm valves 40A, B are opened.

At this time, the cross-sectional area of the flow passage communicating with the pilot pipe 61 is reduced by the pilot flow regulating nozzle 49 formed in a conical shape integrally with the main valve body 42.
From 5, the flow rate of the water discharged to the pilot pipe 61 side is restricted to a necessary minimum.

A permanent magnet 48 is attached to the main valve element 42, and the permanent magnet 48 that moves together with the main valve element 42.
Is detected by a magnetic sensor 99 disposed outside, whereby the open / close state of the diaphragm valves 40A and 40B can be detected.

The spring force of the compression coil spring 46 is set so that the diaphragm valves 40A and 40B can be opened when the upstream water pressure exceeds 20 Kpa. When the pressure of the supply water from the water pipe falls to 20 Kpa or less, the diaphragm valves 40A and 40B remain closed.

With such a configuration, as shown in FIG. 2, when the solenoids of both solenoid driven pilot valves 60A and 60B are turned off, both pilot valves 6A and 6B are turned off.
2 is closed, and both diaphragm valves 40A and B are closed.
No flush water is sent to the toilet.

However, each solenoid driven pilot valve 6
Since a manual button 63 for manually opening the pilot valve 62 is provided at 0A and B, the pilot valve 62 can be manually opened at the time of a power failure or the like. The manual button 63 may be a lever or the like.

The solenoid-operated pilot valve 60 on the rim side
When the solenoid of A is turned on, the diaphragm valve 40A communicating with the conduit 12 to the rim is opened as shown in FIGS. 10 and 11, and water is flushed through the rim of the toilet. At this time,
Since the flow rate per time is controlled by the constant pressure valve 20, the total flow rate can be controlled by the time that the solenoid is kept on.

Next, when the solenoid of the solenoid-driven pilot valve 60A on the rim side is turned off and the solenoid of the solenoid-driven pilot valve 60B on the lower jet nozzle side is turned on, the lower jet nozzle as shown in FIGS. Diaphragm valve 4 leading to line 13 to
OB opens and water is flushed into the lower jet nozzle of the toilet. Also at this time, since the flow rate per time is controlled to be constant by the constant pressure valve 20, the total flow rate can be controlled by the time during which the solenoid is kept on.

As shown in FIG. 14, a communication hole 98 is formed to bypass the diaphragm valves 40A and 40B and communicate the upstream and downstream pipes, and the communication hole 98 is connected by a screw-type manual stopper 97. If the hole 98 can be opened and closed, even if the diaphragm valves 40A and 40B are closed, water can be flowed little by little toward the toilet to prevent freezing in winter. Further, if the manual stopper 97 is largely loosened, it is possible to discharge all the water from the inside of the pipeline when not in use for a long time.

FIG. 15 shows a pipe for supplying toilet flush water of a sequential valve type flush toilet according to a second embodiment of the present invention, and a branch 11 has a pipe 12 to a rim. A three-way valve 80 for selectively communicating one of the pipe lines 13 to the lower jet nozzle with the main pipe 5 is provided, and a main pipe opening / closing valve (stop) for opening and closing the main pipe 5 upstream of the constant pressure valve 20. (A water valve) 70.

With this configuration, the three-way valve 80 is switched so that the main pipe 5 communicates with either the pipe 12 to the rim or the pipe 13 to the lower jet nozzle, and the main pipe opening / closing valve 70 Is opened and closed for a certain period of time, as in the first embodiment, so that a constant flow of water can be flowed through each of the toilet rim and the lower jet nozzle.

FIG. 16 is a longitudinal sectional view showing the configuration of the second embodiment on the downstream side from the main pipe opening / closing valve 70. The configuration of the main pipe opening / closing valve 70 is the same as that of the diaphragm valve 4 of the first embodiment.
This pilot drive valve is exactly the same as 0 and is driven to open and close following opening and closing of a pilot valve 62 opened and closed by a solenoid of a solenoid driven pilot valve 60C. 63
Is a manual button.

Since the constant pressure valve 20 does not need to have a water stopping function in this embodiment, the constant pressure valve 20 of the first embodiment is replaced with the pilot valve 27, the leak hole 34, the auxiliary valve 35, the rod 37 and the like. Is omitted. The function of controlling the water pressure of the pipe line 5 'reaching the outlet-side branch portion to be constant regardless of the water pressure in the inlet-side main pipe 5 is the same as that of the constant pressure valve 20 of the first embodiment.

The three-way valve 80 has a spool valve 82 movably in the axial direction in a cylinder having an inlet of the pipe 12 to the rim and an inlet of the pipe 13 to the lower jet nozzle opened and connected to the side surface. Are fitted. 83 is a compression coil spring for urging the spool valve 82.

The diaphragm valve 81 having the same structure as the diaphragm valve 40 of the first embodiment is moved following the opening and closing of the pilot valve 62 opened and closed by the solenoid of the solenoid driven pilot valve 60D. By moving the spool valve 82 in the axial direction, the control is performed such that one of the pipeline 12 to the rim and the pipeline 13 to the lower jet nozzle communicates with the upstream side.

Specifically, when the solenoid of the solenoid-operated pilot valve 60D for the three-way valve 80 is off, the pipe line 12 to the rim communicates with the upstream side, and when it is on, the pipe line to the lower jet nozzle 13 communicates with the upstream side.

With such a configuration, as shown in FIG. 16, when the solenoid of the solenoid driven pilot valve 60C for the main pipe opening / closing valve 70 is off, the main pipe opening / closing valve 70C is turned off.
Is closed, the main pipe 5 is closed, and as shown in FIG.
When the solenoid of the solenoid-operated pilot valve 60C for the main pipe opening / closing valve 70 is turned on while the solenoid of D is off, water flows to the rim of the toilet bowl through the conduit 12 to the rim.

As shown in FIG. 18, when the solenoid of the solenoid driven pilot valve 60D for the three-way valve 80 is switched on while the solenoid of the solenoid driven pilot valve 60C for the main pipe opening / closing valve 70 is on. The water is flushed to the lower jet nozzle of the toilet through a line 13 to the lower jet nozzle.

The present invention is not limited to the above embodiment. For example, the switching of the pipe 12 to the rim and the pipe 13 to the lower jet nozzle are performed by driving a three-way valve by a motor. You may. Further, the constant pressure valve 20 according to the first embodiment does not have to have the water stopping function similarly to the constant pressure valve 20 according to the second embodiment.

[0072]

According to the present invention, a pipeline switching valve that is switched by electrical control so as to selectively communicate a main pipe with a rim and a lower jet nozzle, and an inlet-side pipeline of the pipeline switching valve. By providing a constant pressure valve for adjusting the internal water pressure to a predetermined constant pressure set by the urging force of the spring, a constant amount of water can be alternately flowed to the toilet rim and the lower jet nozzle. Therefore, the configuration becomes very simple as compared with the conventional case, and a significant cost reduction can be realized.

[Brief description of the drawings]

FIG. 1 is a piping diagram for supplying toilet flush water of a sequential valve type flush toilet according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a specific configuration of the first embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing a specific configuration of the first embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of the constant flow valve according to the first embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of the constant flow valve according to the first embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of the constant flow valve according to the first embodiment of the present invention.

FIG. 7 is a longitudinal sectional view of the vacuum breaker according to the first embodiment of the present invention.

FIG. 8 is a longitudinal sectional view of the diaphragm valve according to the first embodiment of the present invention.

FIG. 9 is a longitudinal sectional view of the diaphragm valve according to the first embodiment of the present invention.

FIG. 10 is a cross-sectional view showing a specific configuration of the first embodiment of the present invention.

FIG. 11 is a longitudinal sectional view showing a specific configuration of the first embodiment of the present invention.

FIG. 12 is a cross-sectional view showing a specific configuration of the first embodiment of the present invention.

FIG. 13 is a longitudinal sectional view showing a specific configuration of the first embodiment of the present invention.

FIG. 14 is a longitudinal sectional view showing a specific configuration of an example in which a manual stopper is added to the first embodiment of the present invention.

FIG. 15 is a piping diagram for supplying toilet flush water of a sequential valve type flush toilet according to a second embodiment of the present invention.

FIG. 16 is a longitudinal sectional view showing a specific configuration of the second embodiment of the present invention.

FIG. 17 is a longitudinal sectional view showing a specific configuration of the second embodiment of the present invention.

FIG. 18 is a longitudinal sectional view showing a specific configuration according to the second embodiment of the present invention.

FIG. 19 is a piping diagram for supplying toilet flush water of a conventional sequential valve type flush toilet.

[Explanation of symbols]

 Reference Signs List 5 main pipe 5 'pipe leading to branch 11 branch 12 pipe to rim 13 pipe to lower jet nozzle 20 constant pressure valve 40A, B diaphragm valve 60A, B solenoid valve driven pilot valve 70 main pipe opening / closing valve 80 three Directional valve

Claims (11)

[Claims] 1. A fixed amount switching valve device for a flush toilet for alternately flowing tap water having a constant flow rate to a rim and a lower jet nozzle of a toilet using a supply water pressure from a water pipe. Pipe switching valve that is switched by electrical control so as to selectively communicate a main pipe through which water to be passed with the rim and the lower jet nozzle, and a water pressure in an inlet-side pipe of the pipe switching valve. A constant pressure valve for regulating the pressure to a predetermined constant pressure set by a biasing force of a spring. 2. The pipeline switching valve has a first on-off valve for opening and closing a pipeline leading to the rim and a second on-off valve for opening and closing a pipeline leading to the lower jet nozzle. 2. The fixed amount switching valve device for a flush toilet according to claim 1, wherein 3. The fixed amount switching valve device for a flush toilet according to claim 2, wherein the constant pressure valve has a water stopping function for closing the main pipe when the downstream water pressure is higher than a predetermined pressure. 4. An on-off valve closing spring, wherein at least one of the first and second on-off valves is configured to close the on-off valve when the upstream water pressure of the on-off valve becomes lower than a predetermined pressure. The fixed amount switching valve device for a flush toilet according to claim 2 or 3, further comprising: 5. The pipeline switching valve is disposed at a branch of the pipeline so as to selectively communicate either one of the pipeline leading to the rim and the pipeline leading to the lower jet nozzle with the main pipe. 2. The fixed-quantity switching valve device for a flush toilet according to claim 1, further comprising a main pipe opening / closing valve for opening and closing the main pipe. 6. A diaphragm in which at least one of the first on-off valve, the second on-off valve, the three-way valve and the main pipe on-off valve is driven following the opening and closing of a pilot valve opened and closed by an electromagnetic solenoid. Claims 2 and 3 comprising a valve.
The fixed amount switching valve device for a flush toilet according to 4 or 5. 7. The at least one of the first on-off valve, the second on-off valve and the main pipe on-off valve needs a flow rate of water flowing to the pilot valve side when the diaphragm valve is fully opened. 7. The fixed-quantity switching valve device for a flush toilet according to claim 6, further comprising a pilot flow rate regulating means for minimizing the flow rate. 8. The three-way valve selectively moves one of a pipeline leading to the rim and a pipeline leading to the lower jet nozzle to an upstream pipeline by moving a spool valve in an axial direction. The fixed-quantity switching valve device for a flush toilet according to claim 5, 6, or 7, which is in communication with the flush toilet. 9. The main pipe, wherein the main pipe opening / closing valve is arranged upstream of the constant pressure valve, and the main pipe is set so as to close the main pipe opening / closing valve when the water pressure in the main pipe becomes lower than a predetermined pressure. 9. The fixed quantity switching valve device for a flush toilet according to claim 5, wherein a closing spring is provided. 10. At least one of the first on-off valve, the second on-off valve, and the main pipe on-off valve is moved corresponding to the movement of the valve body to detect the open / closed state of the valve from outside. The fixed amount switching valve device for a flush toilet according to any one of claims 2 to 9, wherein a permanent magnet is provided. 11. The fixed amount switching of a flush toilet according to claim 6, wherein a manual valve opening mechanism for manually opening the valve is provided in addition to the pilot valve opened and closed by the electromagnetic solenoid. Valve device.