JPH051746Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a hot and cold water mixing faucet, and particularly to a hot and cold water mixing faucet equipped with a water hammer prevention mechanism.

(Prior Art) Conventionally, a hot water/cold water mixing faucet equipped with a water hammer prevention mechanism has the structure shown in FIG.
There is.

The one in Figure 5 shows the hot water flow path 1 of the hot water mixing faucet main body A.
A relief valve seat 5 and a relief valve hole 6 are provided in the partition wall portion 4 that partitions the mixed water flow path 2 and the water flow path 3 and the mixed water flow path 2, with the hot water flow path 1 side and the water flow path 3 side being primary sides, respectively,
The primary side of each relief valve seat 5 is always biased toward the relief valve seat 5 side by a spring 7, and when it receives pressure inside the primary side and the pressure exceeds the spring force of the spring 7, the relief valve seat a piston 8 that operates to move away from the
By providing a relief valve body 9 that advances and retreats integrally with the piston 8 and approaches and separates from the relief valve seat 5, the pressure in the hot water flow path 1 and the water flow path 3 is prevented from rapidly increasing due to sudden closing of the on-off valve. When the pressure rises to 1, the relief valve e is opened by the rising pressure, and the rising pressure is released into the mixed water flow path 2 to prevent water hammer.

On the other hand, the hot water flow path and the water flow path of a hot water mixing faucet are each equipped with a check valve on the upstream side of the on-off valve, but when only the hot water side is discharged, the check valve is activated by the heat from the hot water side transmitted through the partition wall. In order to prevent the water in the sealed space between the water side on-off valve and the check valve from thermally expanding and the pressure in the space to increase, the valve seat is designed to be slidable. The slide expands the sealed space to absorb rising pressure.

However, if the check valve seat of the hot water mixer faucet equipped with the water hammer prevention mechanism shown in Fig. 5 is designed to be slidable, it is possible to install multiple hot water mixer faucets using the same hot water source. In this case, when one hot water mixer faucet is used, the water hammer prevention mechanism on the hot water flow path side of the other unused hot water mixer faucet is activated, causing water to leak from the outlet of the unused hot water mixer faucet, which can be mistaken for a malfunction. There is a fear.

In other words, since hot water generally passes through a throttle or water heater, the dynamic water pressure is lower than on the water side that does not pass through such a device, but when hot water supply is stopped, the hydrostatic pressure is the same as on the water side. It's getting old.

Therefore, if hot water is supplied from one of the multiple hot and cold water mixing faucets that use the same hot water source, the pressure in the hot water supply pipe will drop and become lower than the pressure on the water side, so the hot water flow from the other unused hot and cold water mixing faucets will decrease. In the case of roads, the balance between the primary and secondary sides of check valves, which used to be balanced at the same pressure as the water side, is disrupted, and the pressure on the primary side becomes lower than the secondary side, causing the check valve to become unbalanced. The valve seat of the valve again slides toward the primary side until the pressure on the secondary side is balanced with the pressure on the primary side.

Next, when you stop the hot water supply from the hot water mixing faucet that was being used, the pressure in the hot water side pipe will rise and return to the same pressure as the water side, so the hot water mixing faucet that was not used will slide toward the primary side. The check valve seat is 2
It moves to the next side, and the pressure on the secondary side increases.

Therefore, due to this pressure increase, the water hammer prevention mechanism on the hot water side operates even though it is not in use, and its piston and relief valve body move in the valve opening direction, causing the check valve in the hot water flow path and the secondary The side water flows out from the outlet via the mixed water channel.

(Problem to be solved by the invention) A water hammer prevention mechanism is provided in the hot water flow path and the water flow path to prevent water hammer by activating when the pressure in the flow path suddenly increases and releasing the increased pressure to the mixed water flow path. In the hot water mixer faucet provided, the movement of the valve seat of the hot water side check valve due to the pressure fluctuation on the hot water side that occurs due to the use of other hot water mixer faucets that use the same hot water source is The purpose is to prevent the rising pressure caused by expansion by sliding the valve seat of the water side check valve toward the primary side without impairing the function of absorbing it.

(Means for solving the problem) The technical means taken by the present invention to solve the above problem is to partition the hot water flow path and the mixed water flow path of the hot water mixer faucet body, and the water flow path and the mixed water flow path. A relief valve seat and a relief valve hole are provided in the partition wall portion, with the hot water flow path side and the water flow path side being the primary side, respectively, and the primary side of each relief valve seat is always biased toward the relief valve seat side by a spring. A piston that receives pressure on the primary side and moves away from the relief valve seat when the pressure exceeds the spring force of the spring, and a relief valve body that moves back and forth in conjunction with the piston to approach and separate from the relief valve seat. In a hot water mixing faucet equipped with a water flow path, a check valve with a valve seat member fixed to the hot water flow path is provided in the hot water flow path, and a valve seat member is provided in the water flow path so as to be slidable against the water flow path wall surface. A check valve whose valve seat member is biased toward the secondary side by a spring is provided upstream of the relief valve seat.

(Function) According to the above technical means of the present invention, the valve seat of the check valve on the hot water side is fixed to the hot water flow path, so even if pressure fluctuations occur on the hot water side, the valve seat remains unchanged. There is no movement, and the valve seat of the check valve on the water side can freely slide against the wall of the water flow path, and is biased toward the secondary side by a spring, so there is no pressure increase on the secondary side that exceeds the spring force. If there is, the valve seat will slide toward the primary side.

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

In the figure, A is the hot water mixing faucet main body, in which the valve element of the on-off valve c is a hot water valve hole 13 that communicates with the hot water flow path 1, a water valve hole 14 that communicates with the water flow path 3, and a mixing faucet that communicates with the mixed water flow path 2. Fixed disk 16 with water outflow holes 15
and a movable disk 17 that is slidably superimposed on the fixed disk 16 and has a passage 16 that connects both or one of the hot water valve hole 13 and the water valve hole 14 to the mixed water outflow hole 15. , operate the lever handle 18 to slide the movable disk 17 on the fixed disk 16 to start and stop the flow of hot water and water from the hot water flow path 1 and the water flow path 3 to the mixed water flow path 2, and to control the flow of hot water and water. The proportion of water flowing into the mixed water flow path 2 is adjusted.

The hot water flow path 1 and the water flow path 3 are respectively formed adjacent to the mixed water flow path 2, and a partition wall 4 is formed to partition the hot water and water flow paths 1, 3 and the mixed water flow path 2.
A through hole 19 is formed in the main body A to communicate the hot water and water flow paths 1 and 3 with the mixed water flow path 2 without using the valve element, and an opening 20 coaxial with the through hole 19 is opened in the main body A. A water hammer prevention unit d having a functional section housed in a cartridge case 21 is installed across the opening 20 and the through hole 19.

The hot water flow path 1 has a hot water inlet 22, and the water flow path 3 has a water inlet 23 projecting from the back of the main body A, and these hot water and water inlets 22 and 23 have different structures. Install stop valves a and b.

That is, the check valves a and b on the hot water side and the water side each have cylindrical valve seat members 10 and 11 attached to the inlets 22 and 23, and corresponding valve seat members 10 and 11, respectively. It is composed of check valve bodies 24 and 25 that can freely approach and separate from the secondary side, but the check valve a on the hot water side
The hot water inlet 22 is formed into a screw hole, and a screw 26 is provided on the outer peripheral surface of the valve seat member 10 to screw and fix the valve seat member 10 to the hot water inlet 22, and the check valve b on the water side is connected to the water inlet 2.
3. With both the inner peripheral surface and the outer peripheral surface of the valve seat member 11 made smooth, the valve seat member 11 is slidably inserted into the water inlet 23, and biased from the primary side toward the secondary side by the spring 12. .

The spring 12 is loaded across the valve seat member 11 and a ring 27 fitted near the open end of the water inlet 23.

On the other hand, the water hammer prevention unit d
The cartridge case 21 is open at one end and has a relief valve hole 6 at the other end through a step.
A relief valve seat 5 is formed to protrude along the edge of the relief valve hole 6 on the inner peripheral side of the stepped portion.

The cartridge case 21 also has a relief valve seat 5.
An inflow hole 28 is drilled in the nearby circumferential surface, and a small hole 29 is bored in the circumferential surface of a portion slightly closer to the open end side than the inflow hole 28.

This cartridge case 21 has a piston 8, a relief valve body 9, and an auxiliary piston 3 inside.
0, and a spring 7 that biases the piston 8 and the auxiliary piston 30 in mutually opposite directions. The tip is inserted into the through hole 19 of the partition wall 4, and the lid 31, which also serves as a cover for the opening 20, is screwed onto the rear end, and the partition wall 4 and the opening 20 are clamped and fixed.

The piston 8 is slidably provided on the inner peripheral surface of the cartridge case 21, and a seat packing is attached to the end surface facing the relief valve seat 5, and a relief valve body 9 is integrally provided therein.

Further, the piston 8 has a concave hole 3 extending from the end surface opposite to the end surface where the relief valve body 9 is provided to a midway portion in the axial direction.
2 is recessed, and a through hole 33 is bored from the bottom of the recessed hole 32 to the center of the front surface of the relief valve body 9, and a through hole is provided in the through hole to also fix the sheet packing that constitutes the relief valve body 9. Screw in screw 34.

When the relief valve element 9 is seated on the relief valve seat 5, the piston 8 has a slight distance between its rear end, that is, the open end of the recessed hole 32, and the lid 31 screwed onto the cartridge case 21. Therefore, the piston 8 can slide rearward by that distance, and by sliding backward, the relief valve body 9 separates from the relief valve seat 5.

The piston 8 is also mounted in the cartridge case 21.
A seal packing 35 is fitted into the peripheral surface of the portion located between the inlet hole 28 and the small hole 29 in a concave state toward the inlet hole 28, and the outer diameter rearward of the fitting portion of the U-packing 35 is made slightly smaller than the inner diameter of the cartridge case 21, so that a small gap is formed between the two to form a small passage 36 which guides hot water (cold water) flowing in from the small hole 29 to the gap behind the piston 8.

The auxiliary piston 30 is slidably provided on the inner circumferential surface of the recessed hole 32 of the piston 8 and closes the opening of the recessed hole 32 to form a cavity 37 within the recessed hole 32 .

The spring 7 is elastically loaded between the bottom of the concave hole 32 of the piston 8 and the auxiliary piston 30, and biases the piston 8 in a direction that presses the relief valve element 9 against the relief valve seat 5, and also pushes the auxiliary piston 30 against the lid 31. energized in the direction of pressing into contact with.

Therefore, when hot water is being supplied, the cutting hot water mixing faucet stops the hot water supply by sliding the movable disk 17, and the hot water flow path 1,
When the pressure in the water flow path 3 momentarily increases, the increased pressure immediately acts on the front surface of the piston 8 and the relief valve body 9 through the inflow hole 28 of the cartridge case 21.

On the other hand, the hot water flow path 1 and the water flow path 3 communicate with the rear of the piston 8 and the auxiliary piston 30 via the small hole 29 and small passage 36 of the cartridge case 21, but the small hole 29 and the small passage 36 are Since the pistons are narrow, it takes some time for the pressure increase in the hot water passage 1 and the water passage 3 to act on the rear of the piston 8 and the auxiliary piston 30.

Therefore, at the moment when the pressure in the hot water flow path 1 and the water flow path 3 suddenly increases, a difference is created between the pressures acting on the front side and the back side of the piston 8, and this pressure difference causes the piston 8 to
moves back against the force of the spring 7, and the relief valve body 9 provided integrally with it separates from the relief valve seat 5 and opens the relief valve hole 6, so that the increased pressure passes through the mixed water flow path 3. and is discharged from the discharge port 38. (FIG. 3) When the pressure in the hot water passage 1 and the water passage 3 decreases due to this pressure release, the piston 8 moves forward by the force of the spring 7, and the relief valve body 9 comes into contact with the relief valve seat 5.

Also, due to pressure fluctuations at the hot water supply source and water supply source,
When the pressure of hot water flow path 1 and water flow path 3 increases,
The pressure rises slowly, and there is almost no pressure difference between the front and back sides of the piston 8, so the piston 8 and the relief valve body 9 do not operate, and the relief valve seat hole 6 does not open, but the hot water When the pressure inside the water channels 1 and 3 exceeds the force of the spring 7, the auxiliary piston 8 is pushed into the cavity 37 and moves to a position where it balances the primary pressure.

Therefore, as the volume of the air 37 decreases, the volumes of the hot water and water flow paths 1 and 3 increase accordingly, and the hot water flow paths 1 and 3 increase accordingly.
The increased pressure is absorbed by increasing the volume of the water flow path 2. (Fig. 4) In addition, as only the hot water side is used for a long time, the water side is heated by the heat from the hot water side that is transmitted through the partition wall 4, and the water flow path 3
Even if the water in the sealed space 39 between the opening/closing valve c and the check valve b expands thermally and the pressure in the space 39 increases, the water hammer prevention unit d on the water side
The auxiliary piston 30 operates in the same manner as described above, but at the same time, the valve seat member 11 of the water side check valve b is pressed by the rising pressure and slides toward its primary side, further expanding the sealed space 39 and rising. Absorb pressure. (Fig. 4) On the other hand, if any of the hot water mixing faucets installed with the same hot water supply source starts or stops supplying hot water, and the pressure on the hot water side fluctuates, Side water hammer prevention unit d
Although the auxiliary piston 8 may operate, the valve seat member 10 of the hot water side check valve a does not move because it is fixed to the hot water flow path 1.

Although the structure of the water hammer prevention unit in the above embodiment is different from the conventional water hammer prevention structure shown in FIG. 5, it is of course possible to use the same structure as the water hammer prevention structure shown in FIG. Optional.

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

A check valve with a valve seat fixed to the hot water flow path is installed in the hot water flow path.
A valve seat is provided in the water flow path so as to be slidable against the wall surface of the water flow path, and a check valve in which the valve seat is biased toward the secondary side by a spring is provided on the upstream side of the relief valve seat. , the pressure increase in the closed space (between the open/close valve part and the check valve) on the water side that occurs when only the hot water side is used can be absorbed by sliding the water side check valve toward the primary side. The valve seat of the check valve on the hot water side will not move due to pressure fluctuations on the hot water side that occur when one of the multiple hot water mixing faucets installed with the same source is used or stopped. There is no possibility that the check valve seat on the hot water side will move and the pressure in the hot water flow path on the downstream side of the check valve will instantaneously rise to operate the piston and relief valve body to discharge water.

In other words, in a hot water mixer faucet equipped with a water hammer prevention mechanism, the use of another hot water mixer faucet prevents the water hammer prevention mechanism of the unused hot water mixer faucet from activating, and prevents pressure rise due to thermal expansion on the water side. This can be prevented without impairing the absorption function.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional plan view of a hot water mixer faucet showing an embodiment of the present invention, Fig. 2 is a longitudinal sectional front view, Figs.
The figure is an enlarged sectional view showing the operating state and shows the water side. FIG. 5 is a cross-sectional plan view showing an example of a conventional hot water mixing faucet. A...Hot water mixing faucet, a...Check valve on the hot water side, b...
... Water side check valve, 1 ... Hot water flow path, 2 ... Mixed water flow path, 3 ... Water flow path, 4 ... Partition wall, 5 ... Relief valve seat, 6 ... Relief valve hole, 7 ... Relief valve spring, 8...
... Piston, 9 ... Relief valve body, 10 ... Valve seat member of hot water side check valve, 11 ... Valve seat member of water side check valve,
12...Check valve spring.

Claims (1)

[Scope of utility model registration request] A relief valve seat and a relief valve hole with the hot water flow path side and the water flow path side as the primary side are provided in the partition wall portion that partitions the hot water flow path and the mixed water flow path, and the water flow path and the mixed water flow path of the hot water mixing faucet body, respectively. A spring on the primary side of the relief valve seat is always urged toward the relief valve seat side, and when it receives pressure from the primary side and the pressure exceeds the spring force of the spring, it operates to move away from the relief valve seat. In a hot water mixing faucet equipped with a piston and a relief valve body that moves forward and backward in conjunction with the piston to approach and separate from a relief valve seat, a check valve with a valve seat member fixed to the hot water flow path is provided in the hot water flow path. A valve seat member is provided in the water flow path so as to be slidable against the wall surface of the water flow path, and a check valve in which the valve seat member is biased toward the secondary side by a spring is provided on the upstream side of the relief valve seat. A hot and cold water mixing faucet.