JPH0335546B2 - - 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 mixed faucet or a single faucet, is suddenly closed, the pressure on the primary side suddenly increases, causing water hammer, and the upstream piping and equipment may damage.

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

Incidentally, a device for preventing water hammer is known as described in Japanese Utility Model Publication No. 39-25141, but if this device is applied as is to a water faucet, the following inconveniences and inconveniences will occur.

That is, in the above-mentioned publication, a bypass passage connecting the primary side and the secondary side is provided, a relief valve seat is formed in the bypass passage, and a valve body is made to correspond to the relief valve seat from the secondary side. The valve body is relieved by a spring and urged toward the valve seat side, and when the primary side pressure exceeds the force of the spring, the valve body always releases the valve body and separates from the valve seat, opening the valve and transferring the pressure on the primary side to the secondary side. I'm starting to miss it.

Therefore, if this is suitable for a faucet as it is, even if the faucet is discharging water, if the primary pressure increases due to pressure fluctuations at the hot water supply source and water supply source and exceeds the spring pressure, the relief valve will open and bypass. Water flows from the channel to the secondary side and fluctuates the discharge amount, making it difficult to stabilize the discharge.Especially in the case of hot and cold water mixing faucets, the discharge temperature becomes unstable, and when the pressure at the source of hot water increases, the temperature at the outlet suddenly increases. There is also a problem in terms of safety as the amount of water increases.

(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned problems of the prior art. It is an object of the present invention to provide a faucet that can not only prevent damage to upstream piping and equipment caused by a hammer, but also prevent fluctuations in the discharge state due to an increase in the primary side pressure in the spouting water.

(Means for Solving the Problems) In order to achieve the above object, in the faucet of the present invention, a relief valve hole is provided in the partition wall that partitions the primary side and the secondary side of the faucet body. A relief valve seat is formed on the primary side opening edge of the relief valve seat, and a relief valve seat is provided on the primary side of the relief valve seat so as to face the relief valve seat and receive the primary side pressure on the front side, and corresponds to the relief valve seat. a first piston integrally provided with a valve body; a second piston disposed adjacent to and coaxially with the first piston; A spring is provided to release and urge the valve seat side, and a cavity is formed between the first piston and the second piston, and the cavity and the primary side of the faucet body are communicated through a small hole. It is something.

(Function) In the faucet configured as described above, the cavity formed between the first piston and the second piston is connected to the primary side of the faucet main body through a small hole, so the back side of the first piston In this case, fluctuations in the primary side pressure are transmitted with a slight delay from the front side. Therefore, when the primary pressure rises suddenly, a pressure difference occurs in the primary side cavity, and this pressure difference causes the first piston to retreat, opening the relief valve, and releasing the increased pressure to the secondary side. . Furthermore, when the primary pressure increases gradually, there is almost no pressure difference between the primary side and the cavity, so the first piston does not move and only the second piston moves back to absorb the rising pressure. .

(Example) Hereinafter, an example of the present invention will be described based on the drawings. In this embodiment, the faucet is a single-lever hot water mixer faucet, and the valve elements of the on-off valve A are a hot water valve hole 9 communicating with the hot water flow path 8 of the main body 1 and a water valve hole communicating with the water flow path 10. 11 and a mixed water outflow hole 13 that communicates with the mixed water flow path 12, a fixed disk 14 is slidably superimposed on this fixed plate 14, and a hot water and/or Passage 1 connecting water valve holes 9 and 11 to mixed water outflow hole 13
The lever handle 17 is operated to slide the movable disk 16 on the fixed disk 14 to flow hot water from the hot water flow path 8 and the water flow path 10 to the mixed water flow path 12. It starts and stops the flow of water, and also adjusts the ratio of hot water and water flowing into the mixed water channel 12.

That is, in both the first and second embodiments, the hot water flow path 8
and the water flow path 10 constitute the primary side a of the on-off valve A, and the mixed water flow path 12 constitutes the secondary side b.

Therefore, in the following description, the primary side a includes both the hot water flow path 8 and the water flow path 10.

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 18 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 19 coaxial with the through hole 18 on the primary side a, and a cylindrical cartridge case 20 in which a relief valve B is installed between the opening 19 and the through hole 18. is installed.

The cartridge case 20 has one end open and a relief valve hole 3 formed at the other end through a step 21, and a relief valve seat 4 along the edge of the relief valve hole 3 on the inner surface of the step 21. Form a protrusion.

A lid 22 is removably screwed onto the inner periphery of the open end of the cartridge case 20, and an inflow hole 23 is provided on the periphery of the cartridge case 20 near the relief valve seat 4.

Incidentally, a ventilation passage 24 is formed in the cartridge case 20 and the lid 22 to communicate the inside of the case 20 with the outside of the main body 1.

Further, inside the cartridge case 20, there is a piston 6, a relief valve body 7 that is provided in conjunction with the piston 6 and constitutes a relief valve B corresponding to the relief valve seat 4, and A spring 5 that always biases the body 7 in the direction of the relief valve seat 4 is installed inside.

The piston 6 consists of first, second, and two adjacent pistons 6a and 6b that are slidably provided on the inner circumferential surface of the cartridge case 20, respectively, and a sheet packing is provided on the front surface of the first piston 6a. is attached to integrally form the relief valve body 7.

Further, the first piston 6a has a recess in the axial direction from the rear end to the vicinity of the front end, and the first piston 6a has a recess in the axial direction from the rear end to the vicinity of the front end.
A cavity 25 is formed by the piston 6b, and a small hole 26 communicating with this cavity 25 is bored in the circumferential surface.

The spring 5 is loaded between the second piston 6b and the lid 22.

The cartridge case 20 is inserted into the primary side a of the main body 1 through the opening 19 with the relief valve hole 3 side first, screwed into the opening 19, and the tip is inserted into the through hole 18 of the partition wall 2. Fits in.

It should be noted that between the outer periphery of the cartridge case 20 and the opening 19 of the main body 1 and the through hole 18 of the partition wall 2, between the inner periphery of the cartridge case 20 and the first and second pistons 6a,
6b, it goes without saying that they are sealed through sealing members such as O-rings and U-packets.

In such a faucet, the on-off valve A is in the open state, that is, the primary side a
Dry hot water or water, or both, pass through on-off valve A.
While the flow is flowing to the next side b, operate the lever handle 17 to slide the movable disk 16,
When the on-off valve A is opened, that is, the flow of fluid from the primary side a to the secondary side b is stopped, the pressure on the primary side a rises instantaneously, but the rising force is due to the inflow of the cartridge case 20. Via the hole 23 it immediately acts on the first piston 6a.

On the other hand, the primary side a is also in communication with the cavity 25 formed by the first piston 6a and the second piston 6b, but since what communicates both is a small hole 26 with a very small diameter, the primary side The pressure rise in a is empty chamber 25
It takes some time for it to be transmitted internally.

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 6a and the pressure acting on the back surface of the first piston 6a. moves back against the force of the spring 5, causing the second piston 6b to move back as well.

Then, the relief valve body 7 linked to the first piston 6a also retreats together with the first piston 6a, and the relief valve seat 4
The relief valve B opens when the valve is attached and detached from the valve. (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.

That is, the pressure on the primary side 6a, which instantaneously increases due to the closing of the on-off valve A, is immediately released to the secondary side b via the relief valve B.

When the pressure on the primary side returns to static pressure due to the pressure release to the secondary side b, the first and second pistons 6a and 6b
is moved forward by the force of the spring 5, and the relief valve body 7, which is linked thereto, comes into contact with the relief valve seat 4, and the relief valve is closed.

In addition, the pressure on the primary side a may rise due to pressure fluctuations at the hot water supply source and the water supply source, but in this case, the pressure rises slowly and water flows into the small hole 2.
6 flows into the cavity 25, and there is no significant pressure difference between the inside and outside of the cavity 25, so the first
The piston 6a does not operate and the relief valve B does not open, but when the primary side a pressure exceeds the force of the spring 5, the empty chamber 2
The second piston 6b retreats due to the pressure inside the chamber 25, and the volume of the cavity 25 expands. (FIG. 4) The increased pressure on the primary side a is absorbed by this increase in the volume of the empty chamber 25.

In FIG. 2, C is a check valve, and 27 is a strainer. Although not shown in the drawing, the check valve C is also provided in the water flow path 10, and is connected to the on-off valve A. When the valve is closed, the water in the closed space between the on-off valve A and the check valve C of the water flow path 10 is heated by heat transfer from the hot water in the hot water flow path 8, and the water in the closed space between the on-off valve A and the check valve C of the water flow path 10 is heated and thermally expands significantly. In order to expand the volume of the sealed space and absorb rising pressure, the check valve seat 28 is provided so as to be movable upstream.

In addition, in Fig. 1, D is the secondary side b of the on-off valve,
That is, a bath/shower switching valve is provided in the mixed water flow path 12 and selectively switches the mixed water to be supplied to the bath or the shower, and E is a water stop valve.

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

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

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

(2) 1 due to pressure fluctuations at the hot water supply source and water supply source during discharge.
Even if the pressure on the downstream side increases, the second piston retreats to absorb the increased pressure and the relief valve does not open, so hot water flows into the secondary side from the relief valve in addition to the opening/closing valve, and the discharge amount There is no inconvenience such as an increase in the temperature of the discharged water or fluctuations in the temperature of the discharged water in the case of a hot/cold water mixing faucet, and there is no danger of getting burned due to the discharged temperature rising.

[Brief explanation of drawings]

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, 6a: First piston, 6
b: second piston, 7: relief valve body, 25: empty chamber,
26: Small hole, a: Primary side, b: Secondary side, A: Open/close valve, B: Relief 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 that has an on-off valve that opens and closes by external operating force, and a relief valve seat is formed on the edge of the opening on the primary side. and a first piston provided on the primary side of the relief valve seat so as to face the relief valve seat and receive the primary side pressure on the front side, and integrally equipped with a valve body corresponding to the relief valve seat; a second piston disposed adjacent to and coaxially behind the first piston;
A spring is loaded behind the piston and urges the first piston toward the relief valve seat via the second piston, and a cavity is formed between the first piston and the second piston. A faucet that connects the primary side of the faucet body through a small hole.