JPH07107286B2 - Flash valve piston mechanism - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flush valve piston mechanism that flushes flush water for a certain period of time after completion of flushing, and then automatically stops flushing water in flush toilets and the like.

[Conventional technology]

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

In the flash valve shown in FIG. 10, a partition wall 25 that separates an inflow chamber 23 and an outflow chamber 24 is provided in the casing 22 of the operation valve C. A valve opening 26 for separating the two chambers is formed in the partition wall 25, and a valve element 28 corresponding to the valve opening 26 on the outflow chamber 24 side is provided at one end of a valve rod 27 loosely fitted in the valve opening 26. It is provided and is formed so as to bias the valve body 28 toward the valve opening 26 by the spring 29. A push button 27a is formed integrally with the other end of the valve rod 27.

Further, the flash valve main body 10 includes a piston capable of sliding inside, and the piston is constituted by the piston main body 15 and the like. Also, the water supply pipe A and the water discharge pipe B for draining to the toilet bowl
Connected to.

The pressure chamber 11 and the discharge chamber 12 of the flash valve body 10 are connected to the inflow chamber 23 and the outflow chamber 24 of the operation valve C by a primary side pipe 13 and a secondary side pipe 14, respectively.

When the push button 27a is pressed, the valve port 26 is opened, and the inside of the pressure chamber 11 and the discharge chamber 12 of the flush valve body 10 are brought into communication with each other.

When the internal pressure of the pressure chamber 11 is reduced in this way, the piston is instantly pushed up into the pressure chamber 11 by the high water pressure in the water supply chamber 16, and thus when the push button 27a is released,
Since the valve body 28 is moved by the restoring force of the spring 29 and the valve port 26 is closed, the pressure chamber 11 is in a sealed state. The piston that has risen into the pressure chamber 11 has an orifice 17 composed of a small hole.
Since the water gradually flows into the pressure chamber 11 via the valve, the water gradually falls due to its own weight, and the valve port 18 is closed after a predetermined time.

In this way, the remote control flush valve discharges the high-pressure water in the pressure chamber 11 to the drainage receiving portion of the discharge chamber 12 via the operation valve C provided on the floor or the wall, and thereby the water discharge pipe B to the toilet bowl. Do a flash.

And conventionally, the piston body 15 is made of metal,
The metallic piston lid 36 is screwed on the upper surface, and the metallic piston guide is screwed from below to sandwich the sheet packing.

The cylindrical filter 4 was fitted on the outside of the piston body 15 and fixed from above by the piston lid 36, and the orifice 17 was also opened on the side surface of the piston body 15.

[Problems to be solved by the invention]

However, in the case of a conventional flash valve configuration,
When the piston starts descending after flushing to the toilet bowl, the descending speed is fast, and eventually the piston closes the valve opening shockingly, so a water hammer phenomenon occurs to stop the flow of drainage at once. is there.

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

As described above, in the mechanism for avoiding the water hammer by changing the opening of the conventional orifice portion depending on the descending position of the piston, the needle that detects the descending position of the piston is necessary. When it is fitted inside the orifice, it is necessary to project the needle upward, and it is necessary to arrange a biasing spring for biasing the needle upward inside the piston.

According to the present invention, the needle and the biasing spring are compactly inserted into the interior of the flash valve main body, and the flash valve main body is made light in weight so that it can be reliably operated, thereby facilitating the assembly.

[Means for solving the problem]

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

A flange is fitted and inserted in the center of the upper surface of the piston body of the flash valve, a small hole is provided in the flange, and a needle is inserted and inserted in the small hole. It is made of synthetic resin, and an O-ring is provided on the outer periphery of the flange 2 and fixed by being fitted into an opening provided at the center of the upper surface of the piston body.

In addition, a sheet packing is interposed on the lower surface of the metal piston body, and a piston guide made of synthetic resin is brought into contact with the lower surface of the piston body and fixed to the lower surface of the piston body with screws.

In addition, a cylindrical filter is first inserted into the opening into which the flange at the center of the upper surface of the piston body is inserted, and then the flange is inserted, and the filter 4 constitutes the downward stopper of the flange 2.

[Action]

 Next, the operation of the present invention will be described.

In the state shown in FIG. 2, when the pressure water of the water supply pipe A invades the pressure chamber 11, the small hole 2a is largely opened by the cutout portion 1a, so the pressure water 11 invades the pressure chamber 11. The amount of pressure water to be applied is large, and the descending due to the weight of the piston is fast.

However, when the piston further descends, the needle 1 relatively rises and the cutout portion 1a disappears, so that the entire circumference of the needle 1 closes the small hole 2a as shown in FIG.

However, since there is a slight gap between the small hole 2a and the entire circumference of the needle 1, the pressure water gradually infiltrates into the pressure chamber 11 through this slight gap. In this state, the downward movement of the piston due to its own weight becomes a constant speed.

Therefore, the portion of the seat packing 33 that descends together with the piston is placed on the seat seat 34, and the water supply pipe A to the water discharge pipe B
The speed at which the flow of water to the water is cut is also slow, which prevents water hammer.

〔Example〕

The problem to be solved, the means for solving the problem, and the operation of the present invention are as described above. Next, the configuration of the embodiment shown in the accompanying drawings will be described.

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

The flash valve of the present invention will be described with reference to FIG.

The structure of the operation valve C is the same as that of the prior art shown in FIG. 10, and when the push button 27a is pressed, the valve body 28 opens away from the valve opening 26 against the spring 29, and the flush valve body is opened. The pressure chamber 11 and the discharge chamber 12 of 10 are communicated with each other through the primary side pipe 13, the operation valve C and the secondary side pipe 14.

Since the discharge chamber 12 is open to the atmosphere, the pressure chamber 11
Inside, the water trapped by the valve body 28 is expelled from the discharge chamber 12 at a stroke, and is inserted into the piston main body 7 by the pressure water entering from the back chamber hole 31a of the valve case 31, and the locking claw is provided.
Flange 2 locked to the inner surface of piston body 7 by 2b
And the integrated piston of the piston body 7 rises.

As the piston rises, the portion of the seat packing 33 fixed by the piston guide 8 and the screw 9 on the lower surface of the piston main body 7 is moved to the seat seat 34 of the valve case 31.
When the piston body 7 and the piston guide 8 are lifted at a stretch, the water supply pipe A and the water discharge pipe B communicate with each other through the holes of the seat 34.

As a result, the wash water of the water supply pipe A flows from the water supply pipe A to the toilet at once.

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

In this state, only the large-diameter portion, which is not the notch portion 1a of the needle 1, is still inserted into the small hole 2a provided in the flange 2, and the loosely fitted needle 1 is arranged inside the small hole 2a. Therefore, the gap formed between the small hole 2a and the entire circumference of the needle 1 is small.

However, when the piston rises by operating the push button 27a, the tip of the needle 1 comes into contact with the back surface 20a of the lid 20 of the valve case 31, and the needle 1 cannot rise as the piston body 7 rises. As shown in FIG. 2, the small hole 2a
The position of the needle 1 to be inserted therein shifts from the portion having the entire circumference to the portion of the notch 1a.

The notch 1a provided in the needle 1 has a slight gap, but as a water passage gap when the pressure water gradually enters the pressure chamber 11 and the pressure from below on the piston body 7 is eliminated. It's the big one.

Therefore, in the state shown in FIG. 2, when the pressure water in the water supply pipe A enters the pressure chamber 11, the small hole 2a is notched.
Since the opening is large by 1a, the amount of pressure water that enters the pressure chamber 11 is large, and the piston descends quickly due to its own weight.

However, when the piston body 7 is further lowered, the needle 1
Since the notch portion 1a of is eliminated, as shown in FIG.
The entire circumference of the needle 1 closes the inside of the small hole 2a.

However, since there is a slight gap between the small hole 2a and the entire circumference of the needle 1, the pressure water gradually infiltrates into the pressure chamber 11 through this slight gap. In this state, the piston body 7 descends slowly due to its own weight.

Therefore, the seat packing 33 descending together with the piston body 7
Since the part of is placed on the seat seat 34, the speed at which the flow of water from the water supply pipe A to the water discharge pipe B is cut is also slow, which can prevent a water hammer. is there.

The notch 1a of the needle 1 is not limited to such a planar notch, but as shown in FIG.
The semicircular groove 1c may be provided at four positions in the peripheral position of four, or the triangular cross-sectional groove 1b may be provided as shown in FIG. 6, or as shown in FIG. By the two-stage step 1e,
The descending speed may be changed in two steps, or as shown in FIG. 8, the inclined notch 1d may be configured to linearly gradually decrease the speed.

Next, referring to FIG. 9, the structure of the flash valve body 10 will be described.

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

In particular, there is no flange 2 and it is configured as a piston lid 36 that closes the upper surface of the piston body 7, and as shown in FIG. 10, the orifice 17 was opened on the side surface of the piston body 7.

In the present invention, the needle 1 needs to change its position with respect to the small hole 2a when the piston main body 7 is lifted, and in order to move the needle 1, the lid back surface 20 of the lid 20 is moved.
Since the needle 1 is arranged to come into contact with a, it is necessary to dispose the needle 1 below the lid back surface 20a, and the small hole 2a for inserting the needle 1 is provided at the center position of the piston body 7.

In order to project the needle 1 at the center of the upper surface of the piston body 7 and support it on the needle support 5 and urge the needle support 5 by the biasing spring 6, the needle 1
It is necessary for the upper part of the piston to be slidable with respect to the flange 2 without any resistance. The needle 1 is configured to slide smoothly with the synthetic resin, and an O-ring 32 is interposed between the flange 2 and the piston body 7.

Further, in order to facilitate the assembling of the flange 2 with respect to the piston body 7, it is necessary that the flange 2 can be assembled only by fitting it into the fitting insertion opening at the center of the upper surface of the piston body 7.
A locking claw 2b is provided at the tip of the insertion leg of the flange 2 so that the locking claw 2b can be locked to the lower end surface of the insertion hole of the piston body 7 in an enlarged state.

Further, conventionally, in order to prevent clogging of the hole of the orifice 17, the filter 4 is provided outside the bypass opening 7a of the piston body 7, and when the piston lid 36 on the upper surface is screwed to the piston 15, The U packing 3 and the cylindrical filter 4 were simultaneously sandwiched between the piston 15 and the piston lid 36.

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

According to the present invention, a hole for inserting the cylindrical filter 4 is provided on the inner surface of the flange 2 which is inserted from the upper side, and the filter 4 is inserted in the hole of the flange 2 so as to be in contact with the bottom surface of the piston body 7. By hitting it, it also serves as a lowering stopper for the flange 2, and the assembly of the filter 4 is completed. Therefore, the filter 4 is arranged inside the bypass opening 7a, and the filter 4 is less damaged.

Further, the urging spring 6 below the needle support 5 is also attached to the flange 2
It is inserted and assembled at the same time when assembling.

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

〔The invention's effect〕

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

According to claim (1), a flange is fitted and inserted in the center of the upper surface of the piston of the flash valve, a small hole is provided in the flange, a needle is fitted and inserted in the small hole, and the needle is moved upward by a biasing spring at the bottom of the flange. Since the flange is made of synthetic resin, the O-ring 32 is provided on the outer periphery of the flange 2, and the O-ring 32 is inserted into the opening provided at the center of the upper surface of the piston to fix the flange. It becomes possible to slide the needle 1 for adjusting the gap between the small holes 2a constituting the above by contacting the lid back surface 20a of the lid 20 and to bias the needle 1 upward. Since 6 can be arranged inside the piston body 7, the needle 1 slides straight up and down, the bending force does not act, and the malfunction due to damage is less likely to occur.

As described in claim (2), a sheet packing is provided on the lower surface of the metal piston, and a piston guide made of synthetic resin is brought into contact with the piston guide from below, and the piston main body 7 is screwed.
Since the piston guide 8 is fixed to the lower surface of the piston guide 8, the piston guide 8 is not fixed to the piston main body 7 by screwing, but is fixed to the position protected by the piston guide 8 with the screw 9. The rotation did not loosen the installation.

Further, the loosening of the seat packing, which occurs when the piston guide 8 is directly screwed to the piston body as in the conventional case, is reduced.

Further, the misalignment between the piston body and the piston guide, which occurs when the piston guide is directly screwed into the piston body, is eliminated.

As described in claim (3), the cylindrical filter is first inserted into the opening into which the flange at the center of the upper surface of the piston is fitted,
Next, by inserting the flange, the filter 4 constitutes the stopper on the descending side of the flange 2, so that the cylindrical filter 4 can be housed inside the piston body 7, and the filter 4 can be placed outside as in the conventional case. It is no longer exposed and easily damaged.

Further, since the filter 4 acts as a stopper on the descending side of the flange 2, the flange 2 need only be an upward stopper by the locking claw 2b, and it is no longer necessary to use a fixing method by screwing.

[Brief description of drawings]

1 is a front sectional view of a water hammer prevention type flush valve system of the present invention, FIG. 2 is a front sectional view of a piston in a raised state, and FIGS. 3 and 4 show a needle 1 and a notch 1a. The front view and the side view shown in FIG. 5, FIG. 5, FIG. 6, FIG. 7, and FIG. 8 are sectional front views showing other embodiments of the notch portion of the needle 1, and FIG. 9 is the flash valve piston portion of the present invention. FIG. 10 is an enlarged sectional view of FIG. 10, and is a front sectional view of a conventional flash valve system. 1 …… Needle 1a …… Notch 2 …… Flange 2a …… Small hole 2b …… Locking claw 3 …… U packing 4 …… Filter 5 …… Needle support 6 …… Biasing spring 7 …… Piston body 8: Piston guide 9: Screw 33: Sheet packing 20: Lid

Claims (3)

[Claims] 1. A flush valve piston body is fitted with a flange at the center of the upper surface thereof, a small hole is provided in the flange, a needle is fitted into the small hole, and the needle is biased upward by a biasing spring at the bottom of the flange. In the above construction, the flange is made of synthetic resin, an O-ring is provided on the outer periphery of the flange, and the O-ring is fixed by being fitted into an opening provided in the center of the upper surface of the piston body. 2. A piston guide made of synthetic resin is seated on the lower surface of the metallic piston body from below, and the lower surface of the piston body is screwed to the lower surface of the piston body. The piston mechanism of the flash valve, which is fixed. 3. A cylindrical filter is first inserted into an opening into which the flange at the center of the upper surface of the piston body according to claim 1 is fitted, and then the flange is inserted, and the flange is lowered by the filter. A piston mechanism for a flash valve, which features a stopper.