JP2001146979A - Opening/closing valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an opening/closing valve contributing to stabilization of the working responsiveness and capable of suppressing the manufacturing costs. SOLUTION: A piston 26 is installed in a housing 11 in such a way as slidable in the axial direction. A communication passage 26c is blocked by the head 28a of a Shaft 28 in the initial condition of the shaft 28 and opened by the primary displacement of the shaft 28, and the piston 26 is separated from the seat face 11f by the secondary displacement of the shaft 28.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-off valve for supplying and stopping water supply. This on-off valve is suitable for use in, for example, a tankless toilet which is a flush toilet without a toilet flush tank.

[0002]

2. Description of the Related Art In a general flush toilet, water supplied from a water supply pipe such as a water pipe is temporarily stored in a toilet wash tank such as a low tank, and the toilet bowl is washed with the water stored in the toilet wash tank. Do. However, such a common flush toilet requires an installation space for a toilet flush tank.
For this reason, in recent years, from the viewpoint of effective use of space, etc., an on-off valve is provided between the water supply pipe and the flush toilet, and water supplied from the water supply pipe can be directly supplied to the flush toilet by opening the on-off valve Tankless toilets are being developed (Japanese Unexamined Patent Publication No.
No. 90723).

A conventional on-off valve that can be employed in such a tankless toilet bowl has a water inlet port and a water outlet port formed in a housing, and a valve mechanism capable of opening and closing communication between the water inlet port and the water outlet port is provided in the housing. Have been. The water inlet port is connected to a water supply pipe so that water can be taken into the housing, and the water outlet port is connected to the toilet body so that water can be discharged from the housing to the toilet body toilet. Further, the valve mechanism has a diaphragm between the water inlet port and the water discharge port, and the diaphragm can be bent by operating the solenoid valve.

[0004]

However, in the above-mentioned conventional on-off valve, a diaphragm having high flexibility is adopted as a valve mechanism, and the diaphragm is deflected so that the operation response is not stable. If used, the reliability of the cleaning property and the like will be concerned. In this regard, as a valve mechanism, the valve mechanism is provided so as to be slidable in the axial direction within the housing, and slides to one side in the axial direction to seat on the seat surface of the housing to close communication between the water inlet port and the water outlet port, Adopt a piston that slides to the other side in the axial direction and separates from the seat to open the communication between the water inlet port and the water outlet port, and protrudes from the housing and moves the piston in the axial direction while opposing the biasing means. It is also conceivable to employ a sliding shaft. With an on-off valve adopting such a valve mechanism, the inflexible piston does not bend due to the pressure of water in the water inlet port or the water outlet port, so that the operation response is stable, for example, in a flush toilet. When used, the reliability of washability and the like is improved.

However, in such an on-off valve, when the communication between the water inlet port and the water discharge port is closed, the piston is slid to the other side to thereby open the communication between the water inlet port and the water discharge port. Large pressure acts on the piston due to the water in the inlet port or the outlet port,
This pressure acts as a resistance, requiring a large initial driving force on the shaft. For this reason, this on-off valve requires a driving device for driving the shaft, which requires a large driving force, which leads to an increase in manufacturing cost.

The present invention has been made in view of the above-mentioned conventional circumstances, and it is an object of the present invention to provide an on-off valve capable of contributing to stabilization of operation response and realizing low production cost. It is an issue.

[0007]

An on-off valve according to the present invention is provided in a housing in which a water inlet port and a water outlet port are formed, and can be opened and closed for communication between the water inlet port and the water outlet port. The valve mechanism is provided slidably in the axial direction within the housing, and is seated on the seat surface of the housing by sliding to one side in the axial direction. A piston that closes communication between the water inlet port and the water outlet port, slides toward the other side in the axial direction, separates from the seat surface, and opens communication between the water inlet port and the water outlet port, and the housing; And a shaft that slides the piston in the axial direction while opposing the biasing means, and between the piston and the shaft, a small amount of water is discharged by primary displacement of the shaft, The shaft Wherein the switching means by the following displacement larger secondary displacement may by discharging water of the large flow rate is provided.

In the on-off valve of the present invention, the inflexible piston does not bend due to the pressure of water in the water inlet port or the water outlet port, so that the operation responsiveness is stable and the piston is used in, for example, a flush toilet. In this case, the reliability of the cleaning property is improved. In addition, valve closing and
Since the valve opening speed can be set arbitrarily, even if water flows at a large flow rate, abrupt valve closing can be prevented, so that the occurrence of water hammer can be prevented, and noise and the like can be suppressed. In addition, even with a small piston, the operation can sufficiently open the valve when the water pressure is low, so it is hard to cause pressure loss, and it does not necessarily increase in size, and exhibits excellent mountability to flush toilets etc. can do.

Further, in the on-off valve of the present invention, when the communication between the water inlet port and the water outlet port is closed, the piston is slid to the other side to thereby open the communication between the water inlet port and the water outlet port. The switching means provided between the piston and the shaft operates. In this switching means, first, the shaft is primarily displaced, and a small flow of water is discharged. For this reason, the water in the inlet port or the outlet port flows slightly, and the pressure acting on the piston decreases. Then
In the switching means, the shaft is secondarily displaced, and a large amount of water is discharged. Therefore, at this time, there is no resistance due to a large pressure. Thus, in this on-off valve, the initial driving force acting on the shaft can be reduced, so that a driving device for driving the shaft that requires a very large driving force is not required, and the manufacturing cost can be reduced.

[0010] The switching means is such that the shaft is slidably provided on the piston while securing a communication path between the piston and the water inlet port and the water discharge port. Is sealed,
It is possible to adopt that the communication path is opened by the primary displacement of the shaft and that the piston is separated from the seat surface by the secondary displacement of the shaft.

It is preferable that the pressure receiving area on one axial side (water outlet port side (secondary side)) of the piston is substantially equal to the pressure receiving area on the other axial side (water inlet port side (primary side)). In this case, since the piston receives equal water pressure from one side and the other side in the axial direction, the movement is smooth.
For this reason, since the force acting on the shaft or the urging means can be further reduced, the manufacturing cost can be further reduced.

In the case of employing such switching means, the water outlet port of the housing is opened on one end face side in the axial direction of the piston, the urging means urges the piston to one side in the axial direction, and the communication passage is provided in the piston. The shaft protrudes to one side in the axial direction while having a head capable of sealing the communication path on the other side in the axial direction, and the head is opened by the primary displacement to open the communication path. Can be configured.

The housing preferably has a pressure canceling chamber formed therein. The pressure cancellation chamber allows movement of the piston on the other side of the piston, and communicates with the communication passage if opened by the head of the shaft. Therefore, if such a pressure canceling chamber is formed, it is possible to cancel the pressure that the piston receives from the water in the water inlet port or the water outlet port on the other side. In other words, the water existing on one side of the piston from the water inlet port or the water outlet port moves to the pressure canceling chamber via the communication passage, and the pressure of the water in the pressure canceling chamber and the pressure of the water on one side of the piston are balanced. As a result, the pressure difference between the two is eliminated or reduced. For this reason, in this on-off valve, even if the shaft is not displaced by a very large driving force, the slidability of the piston in the axial direction is secured, the operation responsiveness is stabilized, and the reliability of the cleaning property and the like is improved. be able to.

In the case where the pressure canceling chamber is provided, if the water inlet port and the pressure canceling chamber communicate with each other with almost no flow path resistance, the water in the pressure canceling chamber moves to one side of the piston. Due to the hydrodynamic pressure, a relatively large differential pressure is generated between one side and the other side of the piston. As a result, the shaft must be displaced with a relatively large driving force. In this case, a driving device for driving the shaft which requires a relatively large driving force is required, and the effect of the present invention is diminished.

[0015] Therefore, when the pressure canceling chamber is provided, it is preferable that the water inlet port and the pressure canceling chamber communicate with each other through a throttle flow path having a large flow resistance. If the water inlet port and the pressure canceling chamber are in communication with each other with a greater flow path resistance to the restricting flow path, the dynamic water pressure when water in the pressure canceling chamber moves to one side of the piston becomes smaller, , The pressure difference between one side and the other side can be reduced. For this reason, there is no need to displace the shaft with a very large driving force, and a driving device for driving the shaft that requires a very large driving force becomes unnecessary, and the effect of the present invention becomes effective.

As the throttle channel, a small-diameter hole penetrating the housing, a small-diameter hole penetrating the piston, a gap or a groove formed between the outer surface of the piston and the inner surface of the housing can be adopted. The pressure receiving area on the other side (water inlet port side (primary side)) in the axial direction of the head is preferably smaller than the pressure receiving area on the other side of the piston. In this case, since the head can move to the other side in the axial direction without much resistance, the initial driving force acting on the shaft can be further reduced, and the manufacturing cost can be further reduced.

In this case, the head is moved to the other side in the axial direction on the shaft without contacting the piston in the primary displacement,
In the secondary displacement, a step can be provided to abut the piston and move the piston to the other side in the axial direction.
Further, between the shaft and the piston, there may be provided a second urging means for urging the piston toward the other side in the axial direction with a lower urging force than the urging means until a primary displacement of the shaft. In the on-off valve employing the switching means having the second urging means, the second urging means has an urging force weaker than the urging force of the urging means. Since a small flow of water is gradually discharged at the time of the primary displacement, the effect of reducing the initial driving force acting on the shaft is great.

It is difficult to make the water flow at a constant small flow rate only by the diameter of the communication passage because the pressure of the water in the water supply pipe tends to fluctuate. For this reason, it is preferable that a constant flow valve mechanism that allows a constant small flow of water to flow regardless of the pressure of the internal water is provided in the communication passage. As the constant flow valve mechanism, a known mechanism using an elastic rubber or the like whose opening degree changes according to pressure can be adopted.

The shaft may be driven manually, but the shaft is driven based on an electric signal, so that the effects of the present invention can be more effectively exerted. Further, if a shaft driven based on an electric signal is employed, the on-off valve is automatically opened and closed, which is convenient. When the small flow rate is a flow rate that can prevent freezing, for example, it is possible to realize prevention of freezing of a water supply pipe such as a water pipe or freezing of a trap of a toilet body in cold weather and a low maintenance fee.

When the flush port is connected to the toilet body, a flush toilet can be realized. In particular, it is suitable for use in a tankless toilet that is a flush toilet without a toilet flush tank. Further, it is possible to prevent freezing of the water supply channel leading to the toilet body or freezing of the trap of the toilet body.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments 1 to 3 embodying the present invention will be described below with reference to the drawings. (Embodiment 1) In Embodiment 1, the present invention is embodied in a tankless toilet having no toilet washing tank as a flush toilet. In this tankless toilet, as shown in FIG. 1, a flexible hose 3 is connected to a water supply pipe 1 such as a water pipe via a water stopcock 2, and the flexible hose 3 is connected to a toilet cleaning device 5 provided in the toilet body 4. It is connected to the.

As shown in FIG. 2, the toilet flushing device 5 includes a jet on-off valve 6 connected to the flexible hose 3.
An on-off valve 7 for a rim fixed integrally with the on-off valve 6,
It has a cam device 8 fixed to the upper ends of the on-off valves 6 and 7, and a motor device 9 that drives the cam device 8 adjacent to the cam device 8. The motor device 9 is electrically connected to the controller 10.

As shown in FIGS. 3 to 5, the on-off valve 6 for the jet and the on-off valve 7 for the rim have a water inlet port 11a opened on the side surface of the vertically long housing 11, and the water inlet port of the on-off valve 6 for the jet. The flexible hose 3 is connected to 11a. A main water passage 11b is formed in the housing 11, which is connected to the water inlet port 11a, extends in the width direction, and then extends upward at the center. The water inlet port 11a of the rim on-off valve 7 is connected to the main water channel 11b of the jet on-off valve 6. As shown in FIG. 2, the upper ends of the main water passages 11b of the on-off valves 6, 7 are water outlet ports 11c, 11d opening to the side surface of the housing 11, respectively. The water outlet port 11c is connected to a jet conduit 15, and the jet conduit 15 is connected to a jet nozzle (not shown) provided in the toilet body 4, as shown in FIG. The outflow port 11d is connected to the rim conduit 16 and the rim conduit 16
Is connected to a rim water passage (not shown) of the toilet body 4.

As shown in FIGS. 3 to 5, a piston 12 is provided in the housing 11 of each of the on-off valves 6, 7 so as to be slidable up and down, and the upper end of the piston 12 can be seated in the main water passage 11b. Seat surface 11e is formed. Piston 1
Numeral 2 is urged toward the seat surface 11e by a spring 13 as urging means provided at the lower end side, and the pressure receiving area on the upper side in the axial direction of the piston 12 is substantially equal to the pressure receiving area on the lower side in the axial direction. Have been. A communication passage 12a communicating the water inlet port 11b and the water discharge ports 11c and 11d is provided in the center of the piston 12 in the axial direction, and a shaft 14 extending above the piston 12 is provided in the communication passage 12a. Are provided slidably and a constant flow valve mechanism 17 fixed in the piston 12 is provided. Communication passage 12a
Is a diameter capable of discharging water at a flow rate capable of preventing freezing on the upstream side of the toilet body 4 or freezing of a trap (not shown) of the toilet body 4 by the function of the constant flow valve mechanism 17 through the outer peripheral surface of the shaft 14. Is formed.

At the lower end of the shaft 14, there is formed a head portion 14a which can contact the piston 12 and seal the communication passage 12a. The pressure receiving area on the lower side in the axial direction of the head 14 a is considerably smaller than the pressure receiving area on the lower side of the piston 12. A flange 14b serving as a step is formed slightly above the piston 12 in the shaft 14. The flange 14b has a through hole 14c through which the communication passage 12a communicates with the water discharge ports 11c and 11d when the flange 14b contacts the piston 12. The shaft 14 is driven up and down by a cam device 8 shown in FIG. The cam device 8 is driven by a motor device 9, and the motor device 9 is driven by a controller 10 based on an electric signal.

In the tankless toilet provided with the on-off valves 6 and 7 configured as described above, the switch input causes the tankless toilet shown in FIG.
As shown in FIG. 3, the shaft 14 of the rim on-off valve 6 is largely moved downward as a secondary displacement from the initial state shown in FIG. As a result, the piston 12 of the rim on-off valve 6 separates the seat surface 11e, the main water passage 11b is opened, a large amount of water flows into the rim water passage of the toilet body 4, and the toilet bowl is washed. Will be Next, the shaft 14 of the on-off valve 6 for the rim returns to the initial state shown in FIG. 3, and as shown in FIG. 5, the shaft 14 of the on-off valve 7 for the jet is largely moved downward as a secondary displacement from the initial state. Can be As a result, the piston 12 of the on-off valve 7 for the jet is
e, the main water channel 11b is opened, and a large amount of water flows to the jet nozzle provided in the toilet body 4, forcing a siphon effect. Thereafter, the shaft 14 of the jet on-off valve 7 returns to the initial state shown in FIG. 3, and as shown in FIG. 5, the shaft 14 of the rim on-off valve 6 is again largely displaced downward from the initial state as a secondary displacement. Moved. As a result, the piston 12 of the rim on-off valve 6 is
e, the main water channel 11b is opened, a large amount of water flows into the rim water channel of the toilet body 4, and the toilet bowl is sealed. Then, a series of toilet flushes is completed, and the shaft 14 of the rim on-off valve 6 also returns to the initial state shown in FIG.

During this time, in these on-off valves 6 and 7, the inflexible piston 12 does not bend due to the pressure of the water in the water inlet port 11a, so that the operation response is stable and the tankless toilet bowl is flushed. The reliability of sex has been improved. Further, the valve is closed by the operation of the piston 12.
Since the valve opening speed can be set arbitrarily, even if the water flows at a large flow rate, abrupt valve closing can be prevented, thereby preventing the occurrence of water hammer and suppressing noise and the like. In addition, since the operation of the small piston 12 can sufficiently open the valve at the time of low pressure of the water, the pressure loss is hardly generated, and the size is not necessarily increased, and the excellent mountability to the tankless toilet is exhibited. are doing.

In these on-off valves 6 and 7, the piston 12 is slid downward from a state in which the communication between the water inlet port 11a and the water outlet ports 11c and 11d is closed, thereby the water inlet port 11a and the water outlet ports 11c and 11d. When opening the communication with the shaft 14, the shaft 14 is moved slightly downward as a primary displacement smaller than the secondary displacement, as shown in FIG. At this time, the piston 12 is seated on the seat surface 11e until it comes into contact with the flange 14b of the shaft 14, and closes the communication between the water inlet port 11a and the water outlet ports 11c and 11d. However, the head 14a of the shaft 14
Is separated from the piston 12 and the head 14a is
To release. As a result, a small amount of water flows through the communication passage 12a,
The water reaches the outlet ports 11c and 11d through the through hole 14c, and flows to the rim water passage and the jet nozzle. Therefore, the water in the water inlet port 11a flows to the water outlet ports 11c and 11d through the communication passage 12a, and the pressure acting on the piston 12 decreases. Next, as described above, the shaft 14 is secondarily displaced, and a large amount of water is discharged. For this reason,
At this time, there is no resistance due to a large pressure. In this way, the on-off valves 6 and 7 can reduce the initial driving force acting on the shaft 14, so that the cam device 8 and the motor device 9 for driving the shaft 14 do not need to have a large driving force. Manufacturing costs have been reduced.

Particularly, in these on-off valves 6, 7, the pressure receiving area on the upper side in the axial direction of the piston 12 is substantially equal to the pressure receiving area on the lower side in the axial direction. And the same pressure from the lower side, the movement becomes smooth. For this reason, the force acting on the shaft 14 or the spring 13 can be further reduced, thereby further reducing the manufacturing cost.

In these on-off valves 6 and 7, the head 14
Since the pressure receiving area on the lower side in the axial direction of a is smaller than the pressure receiving area on the lower side of the piston 12, the head 14a can move to the lower side in the axial direction without much resistance, and the shaft 1
4 can be further reduced, and the manufacturing cost can be further reduced. In cold weather, the shaft 14 is kept in a primary displacement state. Thereby, since a small amount of water continues to flow to the rim water passage and the jet nozzle, the freezing of the water supply passage leading to the water supply pipe 1 and the toilet body 4 or the trap of the toilet body 4 and the prevention of freezing on the downstream side thereof, An inexpensive maintenance fee can be realized.

In the above embodiment, the through hole 14c is formed through the flange 14. However, instead of the through hole 14c, a groove for communicating the communication passage 12a with the water outlet ports 11c and 11d may be formed. (Embodiment 2) In Embodiment 2, the on-off valves 18 and 19 shown in FIGS. These on-off valves 18, 19
In this embodiment, a shaft 20 having a small diameter on the side of the piston 12 and a large diameter above the piston 12 is employed, and a spring 21 having a lower biasing force than the spring 13 is interposed between the piston 12 and the large diameter portion. The other configuration is the same as that of the first embodiment, and the same configuration is denoted by the same reference numeral, and the detailed description of the configuration is omitted.

In the opening / closing valves 18 and 19, the spring 21 having an urging force weaker than the urging force of the spring 13 from the initial state shown in FIG. 6 to the primary displacement of the shaft 20 shown in FIG.
Gradually decreases, and a small flow rate of water is gradually discharged. Then, when the shaft 20 is at the time of the secondary displacement, the spring 21 becomes the contracted end, the piston 12 separates from the seating surface 11e, the main waterway 11b is opened, and the large amount of water flows into the toilet body 4
Flows into the rim water passage or the jet nozzle, and the toilet bowl is washed. Thus, the opening / closing valves 18 and 19 can greatly reduce the initial driving force acting on the shaft 20.

Other functions and effects are the same as those of the first embodiment. (Embodiment 3) Embodiment 3 employs the on-off valves 22 and 23 shown in FIGS. These on-off valves 22, 2
3, the water inlet port 11a is opened on the side surface of the vertically long first housing 24, the second housing 25 is fixed to the lower end of the first housing 24, and the first housing 24 and the second housing 25 are provided. 11 are constituted. A piston 26 is provided in the housing 11 so as to be slidable up and down. In the housing 11, a pressure canceling chamber 27 is formed below the piston 26 to allow movement of the piston 26.

Main water channel 11 formed in housing 11
A seat surface 11f projecting downward in an annular shape is formed at b. An annular packing 26a is embedded on the upper surface of the piston 26 seated on the seat surface 11f. This piston 26
In the outer peripheral surface of this, a throttle passage 26b formed of a small-diameter groove for communicating the main water passage 11b and the pressure canceling chamber 27 is recessed in an appropriate number of axial directions. The piston 26 is provided on the seat surface 1 by a spring 13 provided as a biasing means provided in the pressure canceling chamber 27.
It is urged to the 1f side. A communication passage 26c communicating the pressure canceling chamber 27 and the water outlet ports 11c and 11d is provided in the center of the piston 26 in the axial direction, and a shaft extending above the piston 26 is provided in the communication passage 26c. 2
8 is slidably provided.

At the lower end of the piston 26, there is formed a seat surface 26d which projects annularly downward around the communication passage 26c.
6d head 2 formed at the lower end of shaft 28 seated on
An annular packing 28b is embedded in 8a. The shaft 28 has a small diameter on the piston 26 side and a large diameter above it. A flange 28c is formed at the step of the shaft 28, and the spring 21 is interposed on the flange 28c. Other configurations are the same as those of the first and second embodiments, and the same configurations are denoted by the same reference numerals, and detailed description of the configurations is omitted.

In these on-off valves 22 and 23, if the pressure canceling chamber 27 is opened by the head 28a of the shaft 28, it communicates with the communication passage 26c. Therefore, the pressure canceling chamber 2
7 is formed, the piston 26 is connected to the water outlet port 11c,
The pressure received downward from the water in 11d can be offset. That is, the water existing above the piston 26 from the water outlet ports 11c and 11d moves to the pressure canceling chamber 27 via the communication passage 26c, and the pressure of the water in the pressure canceling chamber 27 and the water above the piston 26 And the pressure difference between them is eliminated or reduced. For this reason, in the on-off valves 22 and 23, the axial slidability of the piston 26 is secured and the operation responsiveness is stabilized without displacing the shaft 28 with a very large driving force. Reliability can be improved.

In these on-off valves 22 and 23, since the water inlet port 11a and the pressure canceling chamber 27 communicate with each other through the throttle passage 26b via the main water channel 11b, the water inlet port 11a and the pressure canceling chamber 27 are connected to each other. Communicates with a flow path resistance through the throttle flow path 26b, and the dynamic water pressure when the water in the pressure canceling chamber 27 moves to the upper side of the piston 26 decreases, and the upper and lower sides of the piston 26 The differential pressure has been reduced. For this reason, it is not necessary to displace the shaft 28 with a very large driving force, and the cam device 8 and the motor device 9 for driving the shaft 28 that do not require a large driving force become unnecessary, and the effect is effective. ing.

Other functions and effects are the same as those of the first and second embodiments.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a tankless toilet according to Embodiments 1 to 3.

FIG. 2 is a schematic rear view of the toilet flushing device for a tankless toilet according to the first to third embodiments.

FIG. 3 is a sectional view showing an on-off valve of the tankless toilet according to the first embodiment in an initial state.

FIG. 4 is a cross-sectional view illustrating the on-off valve of the tankless toilet according to the first embodiment when the shaft is primarily displaced.

FIG. 5 is a cross-sectional view showing the on-off valve of the tankless toilet according to the first embodiment when the shaft is secondary-displaced.

FIG. 6 is a cross-sectional view illustrating an on-off valve of a tankless toilet according to a second embodiment in an initial state.

FIG. 7 is a cross-sectional view illustrating the on-off valve of the tankless toilet according to the second embodiment when the shaft is primarily displaced.

FIG. 8 is a cross-sectional view illustrating the on-off valve of the tankless toilet according to the second embodiment when the shaft is displaced secondarily.

FIG. 9 is a cross-sectional view illustrating an on-off valve of a tankless toilet according to a third embodiment in an initial state.

FIG. 10 is a cross-sectional view of the tankless toilet bowl according to the third embodiment, showing the on-off valve when the shaft is primarily displaced.

FIG. 11 is a cross-sectional view showing the on-off valve of the tankless toilet according to the third embodiment when the shaft is secondary-displaced.

[Explanation of symbols]

6, 7, 18, 19, 22, 23 ... On-off valve 11a ... Inlet port 11c, 11d ... Outlet port 11, 24, 25 ... Housing (24 ... first housing, 25 ... second housing) 11e, 11f ... Seat surface 12, 14, 20, 26, 28 ... valve mechanism (12, 26 ...
Piston, 14, 20, 28 ... shaft 13 ... urging means (spring) 12a, 14a, 28a ... switching means (12a ... communication path,
14a, 28a ... head) 14b, 28c ... step (flange) 21 ... second biasing means (spring) 17 ... constant flow valve mechanism 4 ... toilet body

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenichi Ito 5-1-1 Koiehonmachi, Tokoname-shi, Aichi F-term in Inax Co., Ltd. (Reference) 2D039 BA11

Claims (12)

[Claims] 1. An on-off valve comprising: a housing having an inlet port and an outlet port formed therein; and a valve mechanism provided in the housing and capable of opening and closing communication between the inlet port and the outlet port. The valve mechanism is provided so as to be slidable in the axial direction within the housing, and slides to one side in the axial direction to seat on the seating surface of the housing to establish communication between the water inlet port and the water outlet port. A piston that closes and slides to the other side in the axial direction to separate from the seat surface to open the communication between the water inlet port and the water outlet port; and a piston protruding from the housing and facing the urging means. A shaft for sliding the piston in the axial direction, and between the piston and the shaft,
An on-off valve provided with switching means for discharging a small flow of water by a primary displacement of the shaft and discharging a large flow of water by a secondary displacement of the shaft larger than the primary displacement. The switching means is slidably provided on the piston while ensuring a communication path between the shaft and the piston for communicating the water inlet port and the water outlet port, and the initial state of the shaft. That the communication path is sealed, that the communication path is opened by the primary displacement of the shaft, and that the piston is separated from the seat surface by the secondary displacement of the shaft. The on-off valve according to claim 1, wherein: 3. The on-off valve according to claim 1, wherein the pressure receiving area on one side in the axial direction of the piston is substantially equal to the pressure receiving area on the other side in the axial direction. 4. A water outlet port of the housing is opened at one axial end face of the piston, a biasing means biases the piston to one axial side, and a communication passage is provided between the piston and the shaft. And the shaft protrudes to the one side in the axial direction while having a head capable of sealing the communication path on the other side in the axial direction, and the head is moved to the communication path by primary displacement. The on-off valve according to claim 2, wherein the valve is configured to open. 5. A pressure canceling chamber is formed in the housing to allow movement of the piston on the other side of the piston, and when opened by the head, communicates with the communication passage. 5. The on-off valve according to claim 4, wherein the on-off valve communicates with a throttle channel having a large channel resistance. 6. The on-off valve according to claim 4, wherein the pressure receiving area on the other side in the axial direction of the head is smaller than the pressure receiving area on the other side of the piston. 7. The shaft has its head moved to the other side in the axial direction without contacting the piston in the primary displacement, and contacts the piston in the secondary displacement to move the head in the other direction in the axial direction. The on-off valve according to claim 4, 5 or 6, further comprising a step portion for moving to the side. 8. A second urging means is provided between the shaft and the piston for urging the piston to the other side in the axial direction with a lower urging force than the urging means until a primary displacement of the shaft. 7. The on-off valve according to claim 4, 5 or 6, wherein 9. A communication device according to claim 1, wherein a constant flow valve mechanism is provided in the communication passage.
Or the on-off valve according to 8. 10. The system according to claim 1, wherein the shaft is driven based on an electric signal.
The on-off valve according to 7, 8, or 9. 11. The method according to claim 1, wherein the small flow rate is a flow rate capable of preventing freezing.
The on-off valve according to 8, 9, or 10. 12. The water outlet port is connected to the toilet body, wherein the water outlet port is connected to the toilet body.
The on-off valve according to 8, 9, 10 or 11.