JPH0310835B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a water faucet such as a hot/cold water mixing faucet or a single faucet.

(Prior art) In general, when the on-off valve of a water faucet, whether a mixer faucet or a single faucet, is suddenly closed, the pressure on the primary side suddenly rises, causing water hammer, and the pressure on the upstream side increases rapidly. May damage piping and equipment.

Particularly in the case of faucets in which the valve element is composed of a fixed disk and a movable plate slidably superimposed on the fixed disk, water hammer is likely to occur because the valve closes rapidly when the valve is closed.

Therefore, when pressure rises on the primary side,
It is possible to release the increased pressure to the secondary side, but if this is done, the pressure on the primary side will gradually increase due to pressure fluctuations in the piping caused by the opening and closing of other faucets placed upstream of the piping. The water (hot water) on the primary side will flow to the secondary side even when there is no need to release the pressure, such as when the pressure is released, and not only will the water (hot water) be wasted, but the on-off valve will close. Water (hot water) often and suddenly flows out of the faucet when it is supposed to be on, so there is a risk that it may be mistaken for a malfunction.

(Problem to be Solved by the Invention) The problem to be solved by the present invention is that the primary side and the secondary side are connected by a valve that opens only when a sudden pressure rise occurs on the primary side. That's true.

(Means for Solving the Problems) The technical means taken by the present invention to solve the above problems are as follows: A relief valve hole is formed in the partition wall separating the two, and a relief valve seat is formed at the opening edge of the primary side. A first piston that receives pressure and moves in a direction away from the relief valve seat when the pressure exceeds the force of the spring, and a piston that is adjacent to the first piston at the back of the first piston and that is expandable and retractable between the first piston and the first piston. A second piston that forms a vacant chamber, and a relief valve that is linked to the first piston at the front of the first piston, moves forward and backward in conjunction with the movement of the first piston, and approaches and separates from the relief valve seat, The above-mentioned empty space is connected to the primary flow path via a small passage.

(Function) According to the above technical means of the present invention, 1
When the pressure on the next side suddenly rises, the rising pressure immediately acts on the front side of the first piston.
It takes some time for the pressure to act on the back side of the first piston from the cavity through the small passage, so the moment the primary side pressure rises, a pressure difference is created between the front and back sides of the first piston, and this pressure difference causes The first piston moves backward;
That is, it moves in a direction away from the relief valve seat, and in conjunction with this movement, the relief valve element separates from the relief valve seat and the relief valve opens. On the other hand, when the pressure on the primary side rises gradually and slowly, the pressure inside the cavity also rises as the pressure rises, and there is no noticeable pressure difference between the front and back surfaces of the first piston. The piston does not move and the relief valve remains closed, but when the pressure exceeds the force of the spring, the second piston moves rearward and the volume of the cavity expands.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

In this embodiment, the faucet is a single-lever type hot water mixing faucet, and the valve element of the on-off valve A is the hot water flow path 11 of the main body 1.
A fixed disk 17 is provided with a hot water valve hole 12 communicating with the water flow path 13 , a water valve hole 14 communicating with the water flow path 13 , and a mixed water outlet hole 16 communicating with the mixed water flow path 15 . and a movable disk 19 which is superimposed on the fixed disk 17 and has a recessed passage 18 connecting the hot water and/or water valve holes 12, 14 to the mixed water outflow hole 16 on the sliding surface with the fixed disk 17,
Operate the lever handle 20 to move the movable disk 19
is slid on the fixed disk 17, and the hot water flow path 11,
Starting and stopping the flow of hot water and water from the water flow path 13 to the mixed water flow path 15 and the mixed water flow path 1 of hot water and water.
The ratio of inflow to 5 is adjusted.

That is, in this embodiment, the hot water flow path 11 and the water flow path 13 each constitute the primary side a of the on-off valve A, and the mixed water flow path 15 constitutes the secondary side b.

Therefore, in the following description, the primary side a includes both the hot water flow path 11 and the water flow path 13.

The primary sides a and the primary side a and the secondary side b are separated by a partition wall 2 installed inside the faucet body 1, and the partition wall 2 that partitions the primary side a and the secondary side b is A through hole 21 is provided to communicate the primary side a and the secondary side b without using the on-off valve A.

On the other hand, the faucet main body 1 has an opening 22 coaxial with the through hole 21 on the primary side a, and a cylindrical cartridge case 23 in which a relief valve B is installed between the opening 22 and the through hole 21. is installed.

The cartridge case 23 has one end open and a relief valve hole 3 formed at the other end through a step 24, and a relief valve seat 4 along the edge of the relief valve hole 3 on the inner surface of the step 24. Form a protrusion.

A lid 25 is removably screwed onto the inner circumference of the open end of the cartridge case 23, and an inflow hole 26 is provided on the circumference near the relief valve seat 4.

Note that an air flow passage 27 is provided between the cartridge case 23 and the lid 25.

Furthermore, inside the cartridge case 23, there are two pistons (a first
The piston 6, the second piston 8), the relief valve body 9 that corresponds to the relief valve seat 4 and constitutes the relief valve B, and the first and second pistons 6 and 8 are always biased in the direction of the relief valve seat 4. The spring 5 is accommodated and deployed.

The first piston 6 and the relief valve body 9 are integrally formed.

That is, the first piston 6 is formed into a cylindrical shape with a concave bottom from one end in the axial direction to the vicinity of the other end.
A small passage 10 in the form of a small hole connecting the inside and outside of the piston 6 is provided on the side circumferential surface near the inner bottom surface, and a U-packet 28 is fitted on the outer periphery of the midway portion in the axial direction.

Further, a seat gasket 29 is attached to the end face of the first piston 6 on the closed side, and the relief valve body 9 is integrally formed.

The first piston 6 has the surface provided with the seat gasket 29 on the front side, and the surface is the relief valve seat 4.
The cartridge is slidably housed in the cartridge case 23 so as to face the cartridge.

The second piston 8 is formed into a disk shape, has an O-ring 30 fitted on its peripheral surface, and is slidably housed in the cartridge case 23 adjacent to the back of the first piston 6. A space 7 is formed between the space 7 and the space 6.

The empty chamber 7 is formed like a closed chamber by closing the internal space of the first piston 6 with the front surface of the second piston 8, and has only one space.
It communicates with the outdoor primary side a flow path via the small passage 10.

Further, when the second piston 8 moves and separates from the first piston 6, the empty space 7 expands in volume to include a part of the internal space of the cartridge case 23.

That is, the volume of the empty room 7 can be expanded or contracted.

The spring 5 is loaded between the second piston 8 and the lid 25.

The cartridge case 23 is inserted into the primary side a of the main body 1 through the opening 22 with the relief valve hole 3 side first, and is screwed into the opening 22 and the tip is inserted into the through hole 21 of the partition wall 2. Fits in.

In addition, between the outer circumference of the cartridge case 23 and the circumferential surface of the opening 22 of the main body 1 and the through hole 21 of the partition wall 2,
Each is sealed via a sealing member 31 such as an O-ring.

Such a faucet can be operated by operating the lever handle 20 when the on-off valve A is open, that is, when hot water or water, or both, are flowing from the primary side a to the secondary side b via the on-off valve A. The movable disk 19 is slid to close the on-off valve A, that is, from the primary side a to the secondary side b.
When the flow of fluid is stopped, the pressure on the primary side a rises instantaneously, but this increased pressure immediately acts on the front side of the first piston 6 through the inflow hole 26 of the cartridge case 23. However, since the means for communicating between the cavity 7 formed behind the first piston 6 and the primary side a is the small passage 10 in the form of a small hole, it is difficult for the rising pressure to act on the back side of the first piston 6. It will take some time.

Therefore, at the moment when the pressure on the primary side a suddenly increases due to the closing of the on-off valve A, a difference is created between the pressure acting on the front surface of the first piston 6 and the pressure acting on the back surface of the first piston 6. moves back against the force of the spring 5, causing the second piston 8 to move back as well.

Then, the relief valve body 9 formed integrally with the first piston 6 naturally moves back together with the first piston 6.
Since it is separated from the relief valve seat 4, the relief valve B opens. (Fig. 3) Therefore, the fluid on the primary side a passes through the relief valve B and
It is released to the downstream side b, and the pressure on the primary side a decreases.

In other words, the pressure on the primary side a, which momentarily increases rapidly due to the closing of the on-off valve A, immediately decreases to 2 through the relief valve B.
It escapes to the next side b.

When the pressure on the primary side a returns to its original level due to the above-mentioned release of increased pressure to the secondary side b, the first and second pistons 6 and 8 move forward due to the force of the spring 5, and the relief valve body 9 opens the relief valve. The relief valve B closes when it comes into contact with the seat 4.

In addition, the pressure on the primary side a of a faucet may rise due to pressure fluctuations at the hot water supply source or water supply source, but in this case, the pressure rarely rises suddenly, and the empty room 7 Since there is no extreme pressure difference between the inside and outside, the first piston 6 does not move and the relief valve B does not open.

In addition, even if the pressure rises slowly, the pressure on the primary side a may exceed the force of the spring 5, but in this case, the pressure inside the chamber 7 is also almost the same as the pressure on the primary side a outside the room. Therefore, there is no pressure difference between the front and rear sides of the first piston 6, the first piston 6 does not move, and the relief valve B maintains its closed state.

On the other hand, the second piston 8 moves rearward because the pressure in the cavity 7 has increased to the extent that it exceeds the force of the spring 5 on the front side.

Therefore, this rearward movement of the second piston 8 causes the cavity 7 to expand its volume.

Therefore, by expanding the volume of this empty chamber 7, the primary side a
The rising pressure of is absorbed.

In FIG. 2, C is a check valve, and 32 is a strainer. Although not shown in the drawing, the check valve C is also provided in the water flow path 13, and is used to close the on-off valve A. When the water in the closed space between the on-off valve A and the check valve C of the water flow path 13 is heated due to heat transfer from the hot water in the hot water flow path 11, and the water in the closed space between the on-off valve A and the check valve C of the water flow path 13 is heated and thermally expands significantly, the water in the closed space is heated. In order to expand the volume of the valve and absorb the rising pressure, the check valve seat 32 is provided so as to be movable upstream.

Further, in FIG. 1, D is a bath/shower switching valve that is provided on the secondary side b of the on-off valve A, that is, the mixed water flow path 15, and selectively switches the mixed water supply target to the bath or shower; and E is the stop valve. It's a water valve.

(Effects) Since the present invention has the above configuration, it has the following advantages.

(1) When a sudden sudden pressure rise occurs on the primary side due to sudden closing of the on-off valve, etc., the relief valve opens immediately and releases the increased pressure on the primary side to the secondary side. The occurrence of water hammer can be prevented.

Therefore, there is no risk of damage to upstream piping or equipment due to water hammer.

(2) If the pressure rise on the primary side is slow, the relief valve will not open and will remain closed.

Therefore, due to some reason during the closing of the on-off valve, 1
Even if the pressure on the next side increases, unless the rise is instantaneous and rapid, the water (hot water) on the secondary side will not flow wastefully, that is, the water (hot water) will not be discharged from the faucet.

Furthermore, there is no risk of water being frequently and suddenly discharged while the on-off valve is closed, which could be mistaken for a malfunction.

(3) If the pressure rise on the primary side is slow and the pressure exceeds the set pressure (spring force), the first piston will not move but the second piston will move backwards and the first piston will move backwards. Expand the space at the back of the piston,
The increased pressure on the primary side can be absorbed.

Therefore, there is no inconvenience such as the pressure on the primary side becoming too high and the operation of the on-off valve becoming stiff.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of a faucet showing an embodiment of the present invention, FIG. 2 is a cross-sectional plan view, and FIGS. 3 and 4 are enlarged sectional views of essential parts showing an operating state. 1: Faucet body, 2: Partition wall, 3: Relief valve hole, 4:
Relief valve seat, 5: Spring, 6: First piston, 7: Vacant chamber, 8: Second piston, 9: Relief valve body, 10: Small passage, a: Primary side, b: Secondary side, A: Open/close valve.

Claims (1)

[Claims] 1. A relief valve hole is formed in the partition wall that separates the primary side and the secondary side of a faucet body equipped with an on-off valve that opens and closes by an external operating force, and a relief valve seat is formed at the edge of the opening on the primary side. On the primary side, there is a first piston that is constantly urged toward the relief valve seat by a spring and receives pressure within the primary side, and moves in a direction away from the relief valve seat when the pressure exceeds the force of the spring. a second piston adjacent to the first piston at the back of the first piston and forming an expandable and contractible cavity between the first piston and the second piston, which is connected to the first piston at the front of the first piston, and A water faucet characterized in that a relief valve element is provided that moves forward and backward in conjunction with the movement of one piston toward and away from the relief valve seat, and the empty space is connected to the primary flow path through a small passage. .