JPH07243540A - Path-switchable water cock with water stop function - Google Patents

Abstract

PURPOSE:To prevent water hammering and generate a good water stop condition by furnishing a throttle part on the inner surface of one of the secondary side flow paths, narrowing the gap between the throttle part and the peripheral surface of an operating shaft just before one of the valve seat ports is closed, and throttling the rate of water flow at the secondary flow path. CONSTITUTION:On the sides of a primary side valve chamber 5, two secondary flow paths 7, 8 are formed in communication with each other through valve seat ports 14, 16, and an operating shaft 17 penetrating the chamber 5 and flow paths 7. 8 is reciprocated in the axial direction by a handle 18, and thereby valve elements 13, 15 furnished on the shaft 17 are contacted and separated to/from the seat ports 14, 16. respectively. The valve elements 13, 15 are energized in the direction of closing by a spring 23 furnished between them 13, 15. This water cock is equipped with a throttle part 26 to narrow the gap 28 to the peripheral surface of part of the operating shaft on the inner surface of the secondary flow path 7 just. before the seat port 14 is closed by the valve element 13. and thereby generation of water hammer is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention allows the operation shaft to be moved back and forth by operating the handle to switch the water flow to, for example, the water discharge pipe side or the shower side, and the operation shaft is set to an intermediate position so that the water is stopped simultaneously. The present invention relates to a flow path switching faucet with a water stop function, and more specifically to a flow path switching faucet with a water stop function configured to reduce a water hammer at the time of water stop.

[0002]

2. Description of the Related Art In a faucet used mainly in a bathroom,
By adjusting the mixing ratio of hot water and water beforehand, the flow path can be switched so that hot water is discharged to the discharge pipe side or the shower side by operating the handle when in use, and when not in use, the handle operation can be set to the intermediate position. Conventionally known is a flow path switching faucet with a water stop function that enables simultaneous water stop by.

By the way, in this kind of flow path switching faucet with a water stop function, two secondary side flow paths are formed on both sides of one primary side valve chamber so as to communicate with each other via valve seat openings, respectively. An operation shaft penetrating the side valve chamber and the secondary side flow passage is provided so as to move back and forth in the valve seat opening by a handle operation, and two valve bodies facing the valve seat opening are axially provided on the operation shaft, respectively. The valve body is slidably supported, and the elasticity of a spring interposed between the valve bodies causes the valve body to be in close contact with the valve seat opening so that simultaneous closing and flow path switching are performed.

Therefore, when the water is stopped, the valve body is strongly pressed against the valve seat opening by the elasticity of the spring and the water pressure of the primary side valve chamber to suddenly interrupt the water flow, which causes a water hammer to easily occur. .

Therefore, in a similar faucet disclosed in Japanese Patent Laid-Open No. 3-134381, a stop ring is formed in the valve body so as to protrude from the packing and enter the outflow side (secondary side) flow path. The water hammer is reduced so that the valve body always sits gently on the valve seat opening by allowing the flow rate to be reduced by the throttle ring immediately before water.

[0006]

However, in the structure in which the throttle ring is formed in a part of the valve body like the faucet described in the above publication, sand, iron powder, dust, etc. mixed in running water When a foreign substance is caught or caught in the water flow reducing portion, the valve element may not be able to come into close contact with the valve seat opening, resulting in poor water stopping. That is, this type of faucet presses the valve body against the valve seat opening by the elasticity of the spring and the water pressure on the primary side as described above, so that the valve body floats from the valve seat opening when foreign matter is present. There was a problem that the water could not be stopped as it was.

[0007]

DISCLOSURE OF THE INVENTION A flow path switching faucet with a water stop function of the present invention is intended to solve the above-mentioned problems, and two secondary flow paths are provided on both sides of one primary valve chamber. An operation shaft formed in communication with the valve seat opening and penetrating the primary side valve chamber and the secondary side flow passage is provided so as to move back and forth in the valve seat opening by a handle operation, and the operation shaft is provided with the valve. The two valve elements facing the seat are slidably supported in the axial direction, and the elasticity of the spring interposed between the valve elements causes the valve elements to come into close contact with the valve seat and simultaneously close and flow. In a flow path switching faucet with a water shut-off function adapted to perform path switching, a part of the outer peripheral surface of the operating shaft is provided on the inner surface of the secondary side flow path immediately before the valve seat is closed by the valve body. It is characterized in that a narrowing portion for narrowing the gap is provided.

[0008]

[Function] Since the amount of flowing water is reduced in the gap between the inner surface of the secondary side flow path and the outer peripheral surface of a part of the operating shaft, the operating shaft is forcibly moved back and forth by operating the handle even if foreign matter is caught. Since the valve body is slidably supported on the operation shaft without hindering the forward / backward movement of the operation shaft, the valve body can prevent the valve seat from opening even if foreign matter is caught as described above. Does not prevent you from sticking to.

[0009]

An embodiment of the present invention will be described with reference to the drawings. The illustrated faucet is a thermostatic hot and cold water mixing valve mainly used by being attached to a wall surface of a bathroom to which the present invention is applied. 1 is a socket communicating with a hot water source (with a strainer), 2 is a socket communicating with a hot water source The hot and cold water mixing valve is connected and supported by the sockets 1 and 2 (with a strainer).

Reference numeral 3 denotes a temperature adjusting dial knob for adjusting the mixing ratio of hot water and water so that hot water having a desired temperature can be obtained, and a thermostat (not shown) is incorporated in the botte 4. Hot water at the desired temperature is always
It is designed so that it can flow out to the primary side valve chamber 5 in the inner lower part.

Reference numeral 6 denotes a cylindrical bonnet screwed and fixed in the front opening of the body 4, and the primary side valve chamber 5 is formed on the rear side of the bonnet 6. A secondary side flow passage 7 and a secondary side flow passage 8 are formed on both sides (front and rear sides) of the primary side valve chamber 5. The secondary side flow path 7 is a bonnet 6
The side wall opening of the bonnet 6 formed therein communicates with the water discharge pipe 9, and the secondary side flow passage 8 includes an elbow 10 and a shower hose 11.
It is connected to the shower head 12 via.

Further, the primary side valve chamber 5 and the secondary side flow path 7 are communicated with each other through a valve seat 13 which can be opened and closed by a valve body 13,
The primary side valve chamber 5 and the secondary side flow passage 8 are communicated with each other via a valve seat opening 16 which can be opened and closed by a valve body 15.

Reference numeral 17 denotes an operating shaft having a handle 18 fixed to an outwardly projecting end by means of a screw 19. The operating shaft 17 is moved forward and backward by screwing the screw shaft portion 20 into the bonnet 6. The O-ring 21 provided inside the screw shaft portion 20 prevents water leakage from the secondary side flow path 7. Reference numeral 22 is a shaft-shaped extension portion integrally fixed to the inner end surface of the operation shaft 17, and the extension portion 22 is the valve seat opening 1
4 through the primary side valve chamber 5 and the tip thereof projects to the secondary side flow passage 8.

The valve body 13 facing the valve seat opening 14 and the valve body 1 facing the valve seat opening 16 are provided on the extension portion 22 of the operating shaft 17.
5 are inserted and supported slidably in the axial direction.
Rubber packings 24 and 25 are attached to the surface of the valve body 13 facing the valve seat opening 14 and the surface of the valve body 15 facing the valve seat opening 16 for better sealing. A coil-shaped spring 23 is interposed between the valve bodies 13 and 15 in a compressed state, and the elasticity thereof brings the valve body 13 into close contact with the valve seat opening 14 and the valve body 15 into close contact with the valve seat opening 16, respectively. The slidable range of the valve body 13 is limited by the inner end surface of the operating shaft 17, and the slidable range of the valve body 15 is limited by the head portion 29 of the extension portion 22.

Thus, an inward flange-shaped throttle portion 26 is formed on the inner surface of the bonnet 6 forming the inner surface of the secondary side flow path 7, and a collar portion is formed on the outer peripheral surface of the operating shaft 17 at a portion facing the throttle portion 26. 27 is formed so that the gap 28 between the throttle portion 26 and the collar portion 27 is narrowed immediately before the valve seat 13 is closed by the valve body 13.

Further, the tip end of the extension portion 22 of the operating shaft 17 is extended close to the inner end surface of the elbow 10, and the gap 30 thereof is squeezed just before the valve seat opening 16 is closed by the valve body 15 of the elbow 10. The inner end surface substantially acts as a narrowed portion.

In the enlarged view of the main part of the flow path switching faucet with a water stop function shown in FIG. 3, both valve seat openings 14 and valve seat openings 16 are respectively provided in the valve body 1.
3 shows a state in which the valve bodies 15 are simultaneously closed. In this state, the valve seat opening 14 and the valve seat opening 16 are in close contact with the valve body 13 and the valve body 15 due to the elasticity of the spring 23 and the water pressure of the primary side valve chamber 5, and the both flow paths are stopped.

On the other hand, in FIG. 4, by rotating the handle 18, the operating shaft 17 is advanced to the right in the figure, and the valve body 13 is separated from the valve seat opening 14 by the inner end surface of the operating shaft 17 so that the primary valve The situation where hot and cold water in the chamber 5 is discharged from the water discharge pipe 9 is shown. At this time, the collar portion 27 is separated from the throttle portion 26, and the gap 28 is wide enough to obtain a necessary and sufficient flow rate.

In this situation, when the handle 18 is operated to move the operating shaft 17 leftward and backward in the figure to stop the water stop from the water discharge pipe 9, first, the collar portion 27 and the throttle portion 2 are moved.
The flow area of the gap 28 formed by 6 is narrowed to reduce the amount of flowing water, and thereafter the valve element 13 is brought into close contact with the valve seat opening 14 as shown in FIG. In this way, the valve body 13 becomes the valve seat opening 14
When it comes into close contact with, the water pressure upstream of this gap 28 increases and the difference with the water pressure of the primary side valve chamber 5 can be reduced.
Therefore, the valve seat opening 14 is gently closed without applying a high water pressure (differential pressure) to the back surface of the valve body 13, so that a water hammer does not occur.

Even if foreign matter is caught in the gap 28, since the collar portion 27 is a part of the operating shaft 17, by forcibly operating the handle 18, the operating shaft 17 moves back and forth without any trouble, and the foreign matter is removed. There is no risk of obstructing the movement of the operating shaft 17. Since the valve body 13 is slidably provided on the extension portion 22 of the operation shaft 17, the valve body 13 can be brought into close contact with the valve seat opening 14 and stop running water regardless of foreign matter caught in the gap 28.

Further, by operating the handle 18 in FIG. 5, the operating shaft 17 is further retracted to the left in the figure, and the valve body 15 is engaged with the head portion 29 of the operating shaft 17 so that the valve seat 15 is opened. 1
6 shows a state in which hot water in the primary side valve chamber 5 is discharged from the secondary side flow passage 8, the elbow 10, and the shower hose 11 to the shower head 12 while being separated from 6. At this time, the gap 30 between the tip edge of the head portion 29 and the inner edge of the elbow 10 is sufficiently wide so that a required amount of running water can pass through. When the handle 18 is operated to close the running water and the extension portion 22 integrated with the operation shaft 17 is advanced to the right in the figure, the valve body 1
Just before the valve 5 closes at the valve seat opening 16, the head 29 is moved to the elbow 10
When the gap 30 is narrowed and the amount of flowing water is narrowed by approaching, the water pressure upstream of the gap 30 rises and the difference from the water pressure in the primary side valve chamber 5 becomes small. The water hammer is prevented by closely adhering to. Further, even if foreign matter is caught in the gap 30, the valve body 15 is not prevented from coming into close contact with the valve seat opening 16.

Most of the foreign substances caught in the gap 28 or the gap 30 are separated due to the change in the width of the gap as the handle is operated. Even if foreign matter is caught in this portion, it does not hinder the operation of the handle. In this embodiment, the gap 28 and the gap 30 are provided in both the secondary side flow passages 7 and the secondary side flow passage 8, but it is needless to say that they may be provided in only one side.

[0023]

As described above, in the flow path switching faucet with a water stop function of the present invention, the throttle portion is provided on the inner surface of the secondary side flow passage, and the throttle portion and the operating shaft are closed immediately before the valve seat port is closed. Since the gap with a part of the outer peripheral surface is narrowed so that the flow rate of water can be throttled in the secondary side flow passage, the water hammer can be prevented, and even if foreign matter is caught in this throttle part. Also, there is an advantage that a good water-stopping state can always be obtained without impairing the adhesion of the valve body to the valve seat opening.

[Brief description of drawings]

FIG. 1 is an external perspective view showing an embodiment of a flow path switching faucet with a water stop function according to the present invention.

FIG. 2 is a vertical cross-sectional view of the flow path switching faucet with a water stop function of FIG.

FIG. 3 is an enlarged view of a main part of FIG.

FIG. 4 is an operation state diagram of FIG.

5 is an operation state diagram of FIG.

[Explanation of symbols]

 5 Primary side valve chamber 7,8 Secondary side flow path 13,15 Valve body 14,16 Valve seat opening 17 Operating shaft 18 Handle 22 Operating shaft extension 23 Spring 26 Throttling part 28,30 Gap

Claims (1)

[Claims] 1. An operation for forming two secondary side flow passages on both sides of one primary side valve chamber so as to communicate with each other through respective valve seat openings, and penetrating the primary side valve chamber and the secondary side flow passage. A shaft is provided so as to move back and forth in the valve seat opening by operating a handle, and two valve bodies facing the valve seat opening are axially slidably supported on the operation shaft and interposed between the valve bodies. In the flow path switching faucet with a water stop function, in which the valve body is brought into close contact with the valve seat opening by the elasticity of the spring so that simultaneous closing and flow path switching are performed, the inner surface of the secondary side flow path is A flow path switching faucet with a water stop function, comprising a throttle portion that narrows a gap between the outer peripheral surface of a part of the operation shaft immediately before the valve seat is closed by the valve body.