JPS6234890B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a flush valve, and its purpose is to ensure that the main valve closes after releasing a certain amount of water, and that water is released by pressing the handle. The present invention aims to provide a flush valve that can save water by keeping the amount of water unchanged and not wasting water.

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

In the figure, 1 is a flush valve main body, 2 is an inlet thereof, and 3 is an outlet thereof, and these two ports 2 and 3 communicate with each other via a main valve seat 4.

The main valve seat 4 is fitted onto an annular valve seat packing 4a disposed on a valve seat wall 36 that protrudes into the main body flow path and has a valve hole 7, and its inner circumferential surface. 7. The annular mesh body 4b is constructed by covering a core made of stainless steel or the like with a mesh material.

Further, 5 is an opening opened opposite to the main valve seat 4, and this opening 5 is closed by a lid 6. 8
is a valve body, which consists of an upper valve body 8a and a lower valve body 8b, which are screwed together to form the valve body 8. In the illustrated example, a piston is used as the valve body 8.

The lower valve body 8b has a main valve body 9 and a guide vane piece 10, and the upper valve body 8a of the valve body 8 has a packing 37 with a U-shaped cross section interposed therebetween in a downwardly concave state, so that the inner circumference of the lid 6 is closed. The guide vane pieces 10 of the lower valve body 8b are arranged so as to be slidable on the inner circumferential surface of the annular mesh body 4b of the main valve seat 4 and the inner circumferential surface of the valve hole 7, respectively.

Further, behind the valve body 8, a pressure chamber 11 is formed by the upper valve body 8a of the valve body 8 and the lid 6, and the main valve body 9 is made to correspond to the main valve seat 4 to constitute the main valve A. The valve body 8 also has a control valve chamber 14 connected to the pressure chamber 11 through the control valve seat 12 and to the inflow port 2 side through the bypass passage 13 provided at the bottom of the valve body 8 . Direct pressure chamber 11 to inlet 2
A small hole 20 communicating with the side is provided, and an upper valve body 8 is provided.
a and the lower valve element 8b communicate with the pressure chamber 11 via a passage 15 provided in the upper valve element 8a, and communicate with the outflow port 3 side via a main relief valve seat 16 provided in the lower valve element 8b. A relief valve chamber 17 is formed.

The upper valve body 8a is made of a synthetic resin with low water absorption and good wear resistance, such as modified polyphenylene oxide resin, and the lower valve body 8b is made of brass.

In the control valve chamber 14, a control valve body 18 forming a control valve B corresponds to the control valve seat 12, and in the relief valve chamber 17, a main relief valve C forms a structure corresponding to the main relief valve seat 16. a main relief valve body 19;
Sub-relief valve bodies 22 constituting the sub-relief valve D are provided corresponding to the sub-relief valve seats 21 provided on the main relief valve body 19, respectively.

The control valve body 18 is housed in the control valve chamber 14 with the valve shaft 23 provided on the upper surface inserted through the control valve seat 12 and facing the pressure chamber 11 side, and is located above the small chamber 24 at the opening of the bypass passage 13. It is designed to ride on a step provided in the control valve body 18, and the peripheral surface of the control valve body 18 and the control valve chamber 1
There is a gap between it and the wall of No. 4, allowing water to pass through.

The diameter of the bypass passage 13 is about three times the diameter of the small hole 20, but its water passage area is made smaller than the water passage area when the control valve B is open.

The main relief valve body 19 has a valve shaft 25 integrally provided on its lower surface with a guide hole 2 passing through it in the axial direction.
6, and a rod-shaped sliding member 27 is slidably and non-removably mounted in this guide hole 26, and the rod-shaped sliding member 27 is inserted through the central part of the main relief valve body and inserted into the valve shaft 2.
A through hole 28 communicating with the guide hole 26 of No. 5 is opened,
The upper surface of the relief valve body 19 around the through hole 28 constitutes a planar sub-relief valve seat 21.

In addition, the guide hole 2 is provided on the circumferential surface of the midway part of the valve shaft 25.
A drain hole 29 communicating with 6 is bored.

The main relief valve body 19 is disposed in the relief valve chamber 17 so that the valve stem 25 and the sliding member 27 loosely fit through the main relief valve seat 16 and extend toward the outlet 3, and the spring 30, it is constantly pressed against the main relief valve seat 16 side.

The spring 30 is made of a coil spring and is arranged in the relief valve chamber 17 behind the main relief valve body 19, with one end on the back surface of the main relief valve body 19 and the other end on the ceiling surface of the relief valve chamber 17, that is, the valve body 8. The upper valve bodies 8a of the upper valve bodies 8a are brought into contact with each other.

The sub-relief valve body 22 is formed by covering a disc-shaped washer with a hole in the center with rubber, synthetic rubber, etc.
Seal member 22a having an annular protrusion on its lower surface
is configured by fastening with a cap nut 31 to the lower surface of a cylindrical piston 22b that is open at the top, and the piston 22b is recessed into the ceiling of the relief valve chamber 17, that is, the upper valve element 8a of the valve element 8. Recess 32
A gasket 33 having a U-shaped cross section is interposed upwardly in a concave state and is slidably inserted into the sealing member 22.
a is movably opposed to a sub-relief valve seat 21 provided on the main relief valve body 19 to constitute a sub-relief valve D, and a closed chamber 34 is formed by the piston 22b and the cylinder recess 32.

In addition, the sub-relief valve body 22 has a small water passage hole 45 formed in the circumferential surface of the piston 22b to communicate the closed chamber 34 with the relief valve chamber 17, and a spring 35 is elastically loaded in the closed chamber 34. is always pressed in the valve closing direction.

Reference numeral 38 denotes an actuating portion for actuating the main relief valve body 19, which is supported by the support member 39 so as to be able to reciprocate, its tip facing close to the lower side surface of the sliding member 27 of the main relief valve body 19, and its base end facing the spring 40. When the handle 41 is pressed, it moves forward against the spring 40, and when it is released, it returns to its original position by the elastic force of the spring 40.

The tip of the actuating portion 38 is formed so that its diameter gradually decreases toward the base over an appropriate length, thereby providing a recess 42 on the circumferential surface that becomes shallower as it approaches the tip.

In addition, 43 in the figure is a strainer.

As shown in FIG. 2, in the flush valve of the present invention constructed in this manner, the main valve body 9 is normally pressed against the main valve seat 4 to shut off the inlet 2 and the outlet 3.
The main and sub-relief valve bodies 19 and 22 are connected to the spring 3
0.35, the main and sub relief valve seats 16,
21, the pressure chamber 11 and the outlet 3 are shut off, and the control valve element 18 sinks into the control valve chamber 14 due to its own weight. Now, when the handle 41 is operated to operate the actuating part 38, the actuating part 38 moves forward and tilts the main relief valve body 19 against the springs 30, 35 via the sliding member 27 and the valve shaft 25. the main relief valve seat 16 to open the main relief valve C. At the same time, the main relief valve body 19 pushes up the sub relief valve body 22 against the elastic force of the spring 35, and the sub relief valve D also opens.

Therefore, the pressure chamber 11, the passage 15, the relief valve chamber 1
The water in 7 is released to the outlet 3 through the main relief valve C and the sub-relief valve D, and when the pressure in the pressure chamber 11 becomes lower than the pressure of the water in the inlet 2 part, the valve body 8 rises. Then, the main valve body 9 moves away from the main valve seat 4, the main valve A opens, and water starts flowing from the inlet 2 to the outlet 3. At this time, the control valve body 18 is pushed up by the water pressure and pressed against the control valve seat 12, thereby closing the control valve B. Also, the closed room 34 has a small water passage hole 4.
5, the water that filled the chamber flows out into the relief valve chamber 17 through the small water passage hole 45 provided on the circumferential surface of the piston 22b as the sub-relief valve body 22 is pushed up. to reduce its volume. (Fig. 3) When the valve body 8 rises to a certain position, the control valve body 1
8 hits the lid 6, the control valve B opens and water from the inlet 2 flows into the pressure chamber 11 through the bypass passage 13 and the small hole 20, but the main relief valve C
Since the valve is open, the inflowing water flows out to the outlet 3 side, and the pressure inside the pressure chamber 11 does not rise. Therefore, the valve body 8 continues to rise. As the valve body 8 rises, the sliding member 27 is pulled up while slidingly contacting the tip of the actuating part 38 in the axial direction, and the lower end of the sliding member 27 reaches the tip of the actuating part 38. Then, the main relief valve body 19 is pushed onto the main relief valve seat 16 by the spring 30, and the main relief valve C is closed. do. At this time, since the actuating part 38 has a recess 42 at its tip,
The sliding member 37 falls by this amount, making it easier for the main relief valve C to close. The recess 42 may not be provided.

On the other hand, the auxiliary relief valve body 22 is connected to the main relief valve body 1.
By restoring 9, the pressing force in the valve opening direction is released, and even if an attempt is made to restore the original position by the elastic force of the spring 35, the pressure inside the closed chamber 34 will be reduced, so it will not be possible to restore it easily, and the water flow will be reduced. Since the valve slowly starts to close as water flows into the closed chamber 34 from the hole 45, the sub relief valve D remains open for a while after the main relief valve C opens. Therefore, the water in the pressure chamber 11 passes through the passage 15, the relief valve chamber 17, the auxiliary relief valve D, the through hole 28, the guide hole 26, and the drain hole 29, and flows out to the outflow port 3 side, so that the relief valve C Even if the valve D is closed, the valve body 8 continues to rise for a while while the sub relief valve D is open, and the sliding member 27 is further pulled up and reliably separated from the actuating part 38.
Therefore, the main relief valve C can be reliably closed even if the actuating portion 38 is moved forward and released. (Figure 4).

The valve element 8 rises to the highest position and begins to fall after the sub-relief valve D closes, but since the control valve B is open, water from the inlet 2 side passes through the valve B and enters the pressure chamber 11. and at the same time through the small hole 20 into the inlet 2
Water flows into the pressure chamber 11 little by little. (Figure 5).

Therefore, the volume of the pressure chamber 11 rapidly increases due to the water flowing in from the control valve B and the small hole 20, and the volume of the pressure chamber 11 increases rapidly.
falls rapidly. (Figure 6).

Then, when the valve body 8 descends to a certain position and the valve shaft 23 of the control valve body 18 comes out of contact with the lid 6, the control valve body 18 is pushed up by water pressure, so the control valve B is completely closed. , from now on, small hole 20
Therefore, the valve body 8 slowly descends in response to the small amount of water that comes into the pressure chamber 11. (FIG. 7) Finally, the valve body 8 is lowered, the main valve body 9 is seated on the main valve seat 4, and the main valve A is completely closed.

The control valve body 18 is then moved into the control valve chamber 14 due to its own weight.
It sinks inwards, completes one operation, and returns to the state shown in Figure 2.

On the other hand, the sliding member 27 seats on the actuating part 38 as the valve body 8 descends, but since the valve stem 25 slides on the sliding member 27, it descends together with the valve body 8 and closes the main relief valve C. Keep in valve state. After this, the operating section 3
Even if the sliding member 8 is moved backward, the sliding member 27 only descends, and there is no change in its operation.

It should be noted that the above-described structure is only one embodiment of the present invention, and the present invention is not limited to such a structure. For example, the pressure chamber 11 and the inlet 2 side may be communicated only through the small hole 20 without providing the control valve B, the valve body 8 may be made of any material, and the upper valve It is not necessary to separate the body 8a and the lower valve element 8b into two members, but it may be formed of one member, and furthermore, the valve element 8 can be formed into a diaphragm structure. Further, the structure of the sub-relief valve D is also arbitrary.

Since the present invention is configured as described above, even if the main relief valve closes, the sub-relief valve remains open for a while, and the valve body further rises until the sub-relief valve closes. The sliding member of the relief valve body and the actuating part are reliably separated, the sliding member is securely placed on the actuating part, and the main relief valve can be reliably closed. The body does not continue to rise, and the main valve closes reliably after releasing a certain amount of water. Therefore, the amount of water released does not change depending on how the operating part is operated, and water is not wasted and water can be saved.

Thus, the intended purpose can be achieved.

[Brief explanation of the drawing]

The drawings show an embodiment of the flush valve of the present invention, with FIG. 1 being a longitudinal sectional view, and FIGS. 2 to 7 being longitudinal sectional views showing the operating state. In the figure, 1... flash valve body, 4...
Main valve seat, 8...Valve body, 8...Valve body, 11...Pressure chamber, 16...Main relief valve seat, 19...Main relief valve body, 27...Sliding member, 38...Operating part ,A
...Main valve, C...Main relief valve, D...Sub-relief valve.

Claims (1)

[Claims] 1 A main relief valve body that forms a pressure chamber behind the main valve by a valve body that forms the main valve together with a main valve seat provided in the flash valve body, and that pressure chamber is slidably fitted with a sliding member. and a main relief valve that opens in response to the actuation of the actuating part that acts on the sliding member, and a main relief valve that opens in response to the main relief valve after the main relief valve is closed. A flush valve characterized in that it is connected to a secondary side via an auxiliary relief valve that closes.