JPH0142708Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> This invention is a faucet designed to eliminate the sound generated at the valve part of the faucet by flowing water. Specifically, the present invention is a faucet designed to eliminate the sound generated at the valve part of the faucet due to flowing water. A valve is formed in such a manner that the counterbore formed to surround the valve seat on the downstream side of the valve and the side surface of the valve body form a decompression chamber whose outlet has a smaller area than the opening of the valve. The valve seat and the lower outer peripheral surface of the valve body corresponding to the valve seat are inclined in the shape of a truncated cone so as to fit into each other.

<Prior Art> Conventionally, as this type of faucet, there is a faucet disclosed in Japanese Patent Publication No. 52-2728 as shown in FIG.

In this device, a counterbore 3 formed to surround the valve seat 1 on the downstream side of the valve b and the side surface of the valve body 9 form a decompression chamber c whose outlet 11 has a small area due to the opening of the valve b. By doing so, the flowing water that has passed through the valve b is temporarily stored in the pressure reducing chamber c and exerts a back pressure on the valve b to reduce the flow rate of the flowing water flowing through the valve b. flows out from
Furthermore, by providing a plurality of concave grooves 9c in the upper and lower outer peripheral surfaces of the valve body 9 in the vertical direction, each of which extends around the entire circumference, a large resistance is provided to the flowing water to disturb it, further improving the depressurizing effect and slowing down the flow rate of the flowing water. This makes it difficult for cavitation phenomenon, which causes noise, to occur in the valve part b.

<Problems to be solved by the invention> However, in such conventional faucets, the lower outer circumferential surfaces of the valve seat and the valve body corresponding to the valve seat are simply sloped into a truncated conical shape that fits into each other. Not only is the pressure reduction of the flowing water insufficient at the valve seating portion, that is, the inlet 12 of the valve, but also the pressure reduction of the flowing water at the portion facing the pressure reduction chamber that is continuous with this is insufficient, and the sound generated at the valve portion is completely suppressed. The problem is that it cannot be erased.

Furthermore, if the valve seat and the lower outer peripheral surface of the valve body do not make surface contact with each other when the valve is closed, the flow of water cannot be completely blocked, so the machining accuracy of both slopes must be maintained above a certain level. Not only does the machining work take time, but if the valve is closed when foreign matter such as dirt gets between the two inclined surfaces, there is a problem in that the foreign matter gets caught and the two inclined surfaces cannot reliably come into contact with each other, resulting in water leakage.

In view of such conventional circumstances, the present invention aims to reduce the pressure in the valve seating portion and the portion facing the pressure reducing chamber without bringing the valve seat and the lower outer circumferential surface of the valve body into surface contact when the valve is closed.

<Means for Solving the Problems> The technical means taken by the present invention to solve the above-mentioned problems is to form a step-like portion on the entire circumference from the seating surface of the lower outer peripheral surface of the valve body to the inclined surface facing the decompression chamber. This feature is characterized in that it has been provided for a long time.

<Operation> According to the above-mentioned technical means, the present invention provides resistance to the flowing water by passing between the stepped portion of the valve seat and the valve body, thereby causing the flowing water to pass through the portion facing the decompression chamber from the seating surface. This gradually lowers the flow rate of the flowing water.

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

This embodiment shows a case where the faucet main body A is a flush valve as shown in Fig. 1, and a valve seat 1 is provided in the flow path a on the upstream side of the main valve d of the flush valve A. It is something.

Valve seat 1 connects flow path a to the water supply side and flush valve A.
It is formed by drilling a truncated conical hole that slopes downward and inward in the partition wall 2 that separates the inlet side of the main valve d, and the flow path a adjacent to the back of the valve seat 1 has a wall surface. forms a substantially vertical counterbore 3, which surrounds the valve seat 1.

Further, an opening 4 is formed in the faucet main body A opposite to the valve seat 1, and a screw 6 is carved into the inner peripheral surface of the opening 4 to screw the lid 5 so as to be able to move up and down.

The lid body 5 has a recessed hole 8 in the center of its lower surface that supports the valve shaft 7 so as to be slidable up and down, and a valve body 9 is integrally provided at the lower end of the valve shaft 7.
corresponds to the valve seat 1 to constitute the valve b.

Further, the lid 5 has a tool engagement groove 10 formed on its upper surface, and by rotating the groove 10 with a tool such as a screwdriver, the lid 5 is moved forward and backward, and the valve body 9 is brought into contact with and separated from the valve seat 1.

The valve body 9 is formed of synthetic rubber, natural rubber, synthetic resin, or the like into a substantially disc shape, and its lower outer circumferential surface is formed into a truncated cone shape that fits into the valve seat 1, and a stepped portion 9a extends all around the circumference. set up.

Further, a tapered surface 9b slightly inclined downward and inward is formed on the upper outer circumferential surface of the valve body 9, and the tapered surface 9b and the counterbore 3 form a pressure reducing chamber c adjacent to the back of the valve seat 1. form.

The pressure reducing chamber c has a tapered surface 9b formed on the upper outer circumferential surface of the valve body 9, so that the water flow area of the outlet 11 of the valve body 9 is
The area is narrowed down to be smaller than the aperture area of.

Furthermore, a plurality of concave grooves 9c are provided in the tapered surface 9b of the valve body 9 in the vertical direction around the entire circumference.

When the main valve d of the flash valve A, which will be described later, opens with the valve b open, first the valve b opens.
Water near the inlet 12 passes between the stepped portion 9a formed on the lower outer peripheral surface of the valve body 9 and the valve seat 1, but at this time, the flowing water is resisted by the stepped portion and the flow is disturbed. Reduce the flow rate step by step.

Next, the flowing water that has passed through valve b is temporarily stored in pressure reducing chamber c and exerts back pressure on valve b, reducing the flow rate of the flowing water passing through valve b. 9c, the flow rate of the flowing water passing through valve b is further reduced, and the pressure of the water flowing through valve b is further reduced.
flows toward the main valve d.

Therefore, the flow rate of the flowing water gradually slows down near the inlet 12 of valve b and the outlet 11 of decompression chamber c,
Moreover, since there is no sudden change in the flow path a along the slope of the lower outer circumferential surface of the valve body 9 and the tapered surface 9b of the upper outer circumferential surface, the cavitation phenomenon can be prevented from occurring.

On the other hand, when the activation part 21 of the flush valve A is pressed, the push rod 22 moves forward and pushes the shaft 23a of the relief valve element 23, causing the relief valve element 23 to tilt and the relief valve e to open. Then, the water in the pressure chamber 24 is discharged from the relief valve e, and the pressure balance between the pressure chamber 24 and the outlet 11 side of the decompression chamber c is broken, and the main valve body 25
rises and opens the main valve d.

Then, when you release your hand from the starting part 21, the push rod 22
is retracted by the elastic force of the spring 26, and the relief valve e closes, and water gradually flows into the pressure chamber 24 through the small hole 27, and the main valve body 25 descends accordingly to the main valve seat 28. When the person is seated, the main valve d closes.

Therefore, in this embodiment, the valve b is used to adjust the force and amount of water discharged to the main valve d of the flush valve A, and also has the function of a check valve.

In addition, since flush valves generally have a higher instantaneous flow rate than other faucets, cavitation phenomenon is likely to occur in the main valve d section, but the one in this example reliably prevents cavitation phenomenon and completely prevents cavitation. The sound can be muted.

In the above embodiment, the faucet main body A is a flush valve, but the present invention is not limited to this, and other faucets such as a single faucet or a mixed faucet in which valve b is the main valve can be used to shut off the water. It goes without saying that a faucet may be used, and the means for attaching the valve body 9 can also be selected arbitrarily depending on the faucet.

<Effects of the invention> Since the present invention has the above configuration, it has the following advantages.

The flowing water passes between the valve seat and the stepped portion of the valve body, which provides resistance to the flowing water and gradually reduces the flow rate of the flowing water passing through the portion facing the decompression chamber from the seating surface, so that the valve closes when the valve is closed. It is possible to reduce the pressure in the valve seating portion and the portion facing the pressure reduction chamber without making surface contact between the seat and the lower outer circumferential surface of the valve body.

Therefore, compared to the conventional system in which the lower outer circumferential surfaces of the valve seat and the valve body are inclined in the shape of a truncated cone that fits into each other, water flows quietly from the seating surface to the decompression chamber, reducing noise generated in the valve part. This also makes it easier to process the valve seat and valve body, and even if foreign matter such as dirt gets between the valve seat and the seating surface of the valve body when the valve is closed, it will not be able to be removed between the steps of the stepped part. The water escapes into the recess formed in the valve and is securely closed, completely preventing leakage.

In addition to the stepped portion, if a plurality of grooves are formed on the upper outer circumferential surface of the valve body over the entire circumference, it is possible to completely eliminate the sound generated in the valve portion.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a faucet showing an embodiment of the present invention, Fig. 2 is a partially cutaway sectional view showing an enlarged view of the main parts, and Fig. 3 is a sectional view showing an example of a conventional faucet. It is. a...Flow path, b...Valve, c...Decompression chamber, 1...
Valve seat, 3... Counterbore portion, 9... Valve body, 9a... Stepped portion, 11... Outlet.

Claims (1)

[Scope of utility model registration request] A valve is constructed by making a valve body correspond to a valve seat opened in the middle of the flow path, and the outlet is connected to the above-mentioned point by a counterbore formed to surround the valve seat on the downstream side of the valve and a side surface of the valve body. In a water faucet in which a decompression chamber is formed with a smaller area than the opening of the valve, and the lower outer circumferential surface of the valve seat and the valve body corresponding to the valve seat are inclined in a truncated conical shape that fits into each other, A water faucet characterized by having a step-like portion extending all the way around the sloping surface facing the decompression chamber from the seating surface on the lower outer peripheral surface.