JPH0468131A - Water hammer prevention type flush valve - Google Patents

Abstract

PURPOSE:To prevent water hammer by inserting a needle into a small hole provided through the upper surface of a piston to allow the piston to go down gradually after flushing. CONSTITUTION:When a push button 27a is depressed, water is delivered abruptly from a flow chamber 12 to lift a piston integrally made up of a flange 2 and a piston body 7. As the body 7 rises, a needle supporter 5 urged upwardly by the action of an energizing spring 6 and a needle 1 fixedly secured to the supporter 5 also rise. At this moment, pressure water gradually flows into a pressure chamber 11 through a small gap between a small hole 2a and the entire periphery of the needle 1 and hence the descending velocity of the body 7 under its own weight is decreased. As a result, the velocity of water from a feed water pipe A to an water outlet pipe B, when the flow of the water is shut off, becomes slower, preventing thereby water hammer from taking place.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a water hammer prevention mechanism for a flush valve in flush toilets, etc., which flushes water for a certain period of time after completion, and then automatically stops the flushing water. Regarding.

[Prior art]

An example of a conventional flash valve mechanism is shown in FIG.

In the flush valve shown in FIG.
A partition wall 25 is provided inside the casing 22 to separate it into an inflow chamber 23 and an outflow chamber 24 . The partition wall 25 includes
A valve port 26 separating the compartments is formed, and a valve body 28 corresponding to the valve port 26 is provided on the outflow chamber 24 side at one end of a valve rod 27 that is loosely fitted into the valve port 2G.
The valve body 28 is formed so as to urge the valve body 28 toward the valve port 26. A push button 27a is integrally formed at the other end of the valve stem 27.

Further, the flush valve body 10 includes a slidable piston body 15 therein, and is connected to a water supply pipe A and a water discharge pipe B for discharging water to a toilet bowl.

The pressure chamber 11 and the discharge chamber 12 of the flash valve main body 10 are connected to the inlet chamber 23 and the outlet chamber 24 of the operating valve C by a downstream pipe 13 and a secondary pipe 14, respectively.

When the push button 27a is pressed, the valve port 26 opens and the pressure chamber 11 of the flash valve body 10 and the discharge chamber 12 are brought into communication.

When the internal pressure of the pressure chamber 11 decreases in this way, the piston body 15 is moved to the pressure chamber 11 by the high water pressure in the water supply chamber 16.
When the push button 27a is released, the valve body 28 is moved by the restoring force of the spring 29, and the valve port 26 is closed, so that the pressure chamber 11 is sealed. The piston body 15 has risen into the pressure chamber 11.
As water gradually flows into the pressure chamber 11 through the orifice 17 formed by a small hole, it gradually descends due to its own weight, and the valve port 18 is closed after a predetermined time.

In this way, the remote control type flush valve drains high-pressure water in the pressure chamber 11 to the drainage receiving part of the discharge chamber 12 via the operation valve C installed on the floor or wall, thereby allowing the water to reach the toilet bowl from the water discharge pipe B. It does a flash.

[Problem to be solved by the invention]

However, in the case of traditional flush valve configurations,
After flushing the toilet, when the piston begins to descend, the descending speed is fast, and the piston finally closes the valve port with a sudden jerk, causing the water hammer phenomenon to stop the flow of waste water all at once. It happens.

The present invention prevents water hammer by gradually lowering the piston after the flash.

[Means to solve problems]

The problems to be solved by the present invention are as described above, and next, means for solving the problems will be explained.

A needle is inserted into a small hole provided on the upper surface of the piston of the flush valve, and the needle is urged upward.

Also, a small hole is opened in the piston of the flush valve, a needle is inserted into the small hole, and a biasing spring that biases the needle upward is arranged. The needle is pushed down, and the notch provided in the needle is inserted into the small hole, opening a large gap.As the piston descends, the needle rises and the notch is interrupted, and the entire circumference of the needle is inserted into the small hole. It is configured to be inserted and inserted to open a small gap.

In addition, the shape of the notch of the needle is different, and the water stop time can be changed by replacing the needle.

Also, when the piston rises, the upper end of the needle
It is pressed into the inside of the piston by coming into contact with the back surface of the lid.

[Effect]

Next, the present invention will be explained in detail.

In the state shown in Fig. 2, pressure water to the water supply pipe flows into the pressure chamber 11.
When entering the part of the small hole 2a, the part of the small hole 2a is
Since the opening is large by the amount a, a large amount of pressurized water enters the pressure chamber 11, and the downward movement of the piston body 7 due to its own weight becomes faster.

However, when the piston body 7 further descends, the needle 1
will rise relatively and the notch portion 1a will disappear, so
As shown in FIG. 1, the entire circumference of the needle 1 has a small hole 2a.
It closes off the inside.

However, since there is a small gap between the small hole 2a and the entire circumference of the needle 1, pressure water flows into the pressure chamber 11 from this small gap.
It gradually penetrates into the body. In this state, the piston body 7
The descent due to its own weight becomes slow.

Therefore, the seat pad 3 that descends together with the piston body 7
3 is placed on the seat seat 34, and the speed at which the water flow from the water supply pipe A to the water discharge pipe B is cut is also slow, thereby preventing water hammer. It is.

〔Example〕

The problems to be solved, the means to solve the problems, and the effects of the present invention are as described above.Next, the structure of the embodiment shown in the attached drawings will be explained.

FIG. 1 is a front sectional view of the water hammer prevention type flush valve system of the present invention, and FIG. 2 is a piston body 7.
3 and 4 are front and side views showing the needle 1 and the notch 1a, and FIGS. 5, 6, 7, and 8 show the needle FIG. 9 is an enlarged sectional view of the flush valve and piston of the present invention, and FIG. 10 is a front sectional view of a conventional flash valve system.

Referring to FIG. 1, the flash valve of the present invention will be explained.

The configuration of the operating valve C is the same as that of the prior art shown in FIG. 10, and when the push button 27a is pressed, the spring 2
9, the valve body 28 opens away from the valve port 26, and connects the pressure chamber 11 and discharge chamber 12 of the flash valve body 10, and the downstream pipe 13, the operation valve C, and the secondary pipe 14. They communicate through it.

Since the discharge chamber 12 is open to the atmosphere, the water trapped by the valve body 28 in the pressure chamber 11 is discharged from the discharge chamber 12 all at once, and the pressure that enters from the back chamber hole 31a of the valve case 31 increases. The water causes the integrated piston of the flange 2 and the piston body 7, which are locked to the inner surface of the piston body 7 by the locking claws 2b, to rise.

When the piston body 7 moves up by 1, the portion of the seat gasket 33 fixed to the lower surface of the piston body 7 by the piston guide 8 and screws 9 is attached to the valve case 31.
The piston 7 and the screw 1 guide 8 are removed from the seat 34, and the piston 7 and the screw 1 guide 8 rise all at once, and the water supply pipe A and the water discharge pipe B communicate with each other through the hole in the seat 34.

As a result, the flushing water in the water supply pipe A flows all at once from the water supply pipe A to the toilet bowl.

As the piston body 7 rises, the needle support 5 urged upward by the urging spring 6 and the needle 1 fixed to the needle support 5 also rise.

In this state, only the large diameter portion of the needle needle that is not the cutout portion 1a is still fitted into the small hole 2a provided in the flange 2, and the needle 1 is loosely fitted inside the small hole 2a. Therefore, there is a small gap between the small hole 2a and the entire circumference of the needle 1.

However, when the piston body 7 rises by operating the push button 27a, the back surface 2 of the lid 20 of the valve case 31
The tip of the needle 1 is in contact with the small hole 2a, and the needle 1 cannot rise as the piston body 7 rises, so that the needle 1 inserted into the small hole 2a is completely positioned as shown in FIG. There is a transition from the portion with the periphery to the portion of the notch 1a.

Although the notch 1a provided in the needle 1 is a small gap, it serves as a water passage gap when pressure water gradually enters into the pressure chamber 11 and eliminates pressure from below against the piston body 7. is the larger one.

Therefore, in the state shown in FIG. 2, when pressure water entering the water supply pipe enters the pressure chamber 11, the small hole 2a is opened as wide as the notch 1a, so the pressure chamber 11
The amount of pressurized water that enters the piston body 7 is large, and the piston body 7 descends quickly due to its own weight.

However, when the piston body 7 further descends, the notch 1a
The needle 1 is removed as shown in Figure 1.
The entire circumference of the hole 2a closes the inside of the small hole 2a.

However, since there is a small gap between the small hole 2a and the entire circumference of the needle 1, pressure water flows into the pressure chamber 11 from this small gap.
It gradually penetrates into the body. In this state, the piston body 7
The descent due to its own weight becomes slow.

Therefore, the seat gasket 3 that descends together with the piston body 7
3 is placed on the seat seat 34, and the speed at which the water flow from the water supply pipe A to the water discharge pipe B is cut is also slow, thereby preventing water hammer. It is.

The cutout portion 1a of the needle 1 is not limited to such a planar cutout, but as shown in FIG. Alternatively, as shown in FIG. 6, a triangular cross-section groove 1b may be provided, or as shown in FIG.
Accordingly, the descending speed may be changed in two stages, or, as shown in FIG. 8, an inclined notch 1d may be used to linearly gradually slow down the speed.

Next, referring to FIG. 9, the configuration of the flash valve main body 10 will be explained.

Conventionally, most of the parts of the flash bulb body 10 were made of gun metal. For example, piston guide 8
and the flange 2 part.

In particular, there was no flange 2, and it was constructed integrally with the gunmetal of the piston body 7, and the orifice 17 was opened on the side surface of the piston body 7, as shown in FIG.

In the present invention, when the needle 1 or the piston body 7 rises, it is necessary to change the position relative to the small hole 2a, and the inner surface 20a of the lid 20 is used to move the needle 1. Therefore, it is necessary to arrange the needle 1 below the inner surface 20a of the lid, and a small hole 2a into which the needle 1 is inserted is provided at the center of the piston body 7.

In this way, in order to project the needle 1 to the center of the upper surface of the piston body 7, support it on the needle support 5, and bias the needle support 5 with the biasing spring 6, the upper part of the piston body 7 must be disassembled. In the present invention, the flange 2 is provided on the upper surface of the piston body 7 using synthetic resin, and an O-ring 32 is interposed between the flange 2 and the piston body 7.

In addition, in order to facilitate the assembly of the flange 2 to the piston body 7, the flange 2 needs to be assembled by simply fitting it into the insertion hole in the center of the upper surface of the piston body 7, and the insertion leg of the flange 2 must be A locking claw 2b is provided at the tip so that the locking claw 2b can be enlarged and locked to the lower end surface of the insertion hole of the piston body 7.

Furthermore, in the past, in order to prevent the orifice 17 from clogging,
When interposing the filter 4 on the outside of the piston lid 15 and screwing the upper piston lid 36 onto the piston 15, the U gasket 3 and the cylindrical filter 4 are simultaneously attached to the piston 15 and the piston lid. It was held between the bodies 36.

However, in this conventional configuration, the cylindrical filter 4 exposed to the outside was easily damaged.

In the present invention, a hole for fitting a cylindrical filter 4 is provided on the inner surface of a flange 2 which is inserted from the top, and the filter 4 is inserted into the hole of the flange 2, and the bottom surface of the piston body 7 and the filter 4 are inserted into the hole. By abutting them, the assembly of the filter 4 is completed. Therefore, the filter 4 is arranged inside the bypass open lower lower a, and the filter 4
was less likely to be injured.

Further, the biasing spring 6 below the needle support 5 is also connected to the flange 2.
They can be inserted and assembled at the same time when they are assembled.

The seat packing 33 below the piston body 7 is also made of an elastic material such as synthetic resin, and the seat packing 33 is pressed and held from below by a piston guide 8, and the piston guide 8 holds a screw 9. It is fixed by being screwed onto the piston body 7.

〔Effect of the invention〕

Since the present invention is constructed as described above, it has the following effects.

As in claim (1), the needle is inserted into the small hole provided on the upper surface of the piston of the flush valve, and the needle is urged upward, so that the needle and the piston are always kept relative to each other each time the piston moves up and down. This ensures that the small holes are prevented from clogging.

As in claim (2), the needle 1 is inserted into the small hole 2a provided in the flange 2 of the flush valve, and the urging spring 6 for urging the needle 1 upward is arranged at the lower part of the flange 2, and the piston In the raised position of the main body 7, the needle 1 is pushed down against the urging spring 6, and the notch 1a provided in the needle 1 is inserted into the small hole 2a to open the large hole, and the piston main body 7 is lowered. At the same time, the needle 1 rises and the notch 1a is interrupted, and the entire circumference of the needle 1 is inserted into the small hole 2a, and since the small hole is configured to be open, the piston body 7 is opened in order to flush out the cleaning water. Immediately after the piston body 7 rises, pressurized water again enters from the gap in the small hole 2a, and when the piston body 7 starts to descend due to its own weight, the opening is widened by the notch 1a, so that the pressure water does not enter. is fast,
The descending speed of the screw main body 7 is increased, and just before the seat gasket 33 of the flush valve main body 10 finally comes into contact with the seat seat 34, the notch 1a disappears and the entire needle 1 is removed. Since the circumferential portion is inserted into the small hole 2a, the pressure water intrusion gap becomes small, the descending speed of the piston body 7 becomes low, and the contact state between the seat gasket 33 and the seat seat 34 becomes less shocking. Since the flow of water between the water supply pipe and the water discharge pipe B is slowly shut off, water hammer can be prevented.

According to claim (3), the shape of the notch 1a of the needle 1 is different, and the water stop time can be changed by replacing the needle 1, so that even when the water supply pressure is high or low, the notch 1a is different in shape. By adjusting the amount, the closing time of the flush valve can be controlled.

As in claim (4), when the piston body 7 is raised, the upper end of the needle 1 comes into contact with the back surface 20a of the attachment body 20 and is pressed into the piston body 7, so that the needle 1 moves in and out under force in a straight line in the same direction as the rising direction of the piston body 7, and by receiving force from the side, the needle 1 may be bent or damaged, and the function of the flush valve may be lost. There is less to lose.

[Brief explanation of drawings]

FIG. 1 is a front sectional view of the water hammer prevention type flush valve system of the present invention, and FIG. 2 is a piston body 7.
3 and 4 are front and side views showing the needle 1 and the notch 1a, and FIGS. 5, 6, 7, and 8 show the needle ] FIG. 9 is an enlarged sectional view of the flush valve of the present invention, and FIG. 10 is a front sectional view of a conventional flash valve system.・Piston, piston guide, screws, lid body, jidopa, fitting

Claims (4)

[Claims] (1) A water hammer prevention type flush valve characterized in that a needle is inserted into a small hole provided on the upper surface of the piston of the flush valve, and the needle is biased upward. (2) Open a small hole in the piston of the flush valve,
A needle is inserted into the small hole, and a biasing spring that biases the needle upward is arranged, and when the piston is in the raised position, the needle is pushed down against the biasing spring, and the notch provided in the needle becomes small. The needle is inserted into the hole to open a large gap, and as the piston descends, the needle rises and the notch is interrupted, and the entire circumference of the needle is inserted into the small hole to open the small gap. A water hammer prevention type flush valve featuring the following. (3) A water hammer prevention type flush valve, characterized in that the shape of the notch of the needle according to claim (2) is different, and the water stop time can be changed by replacing the needle. (4) A water hammer prevention type flash according to claim (2), characterized in that when the piston is raised, the upper end of the needle is pressed into the interior of the piston by contacting the ceiling portion of the valve case. valve.