JP2002228041A - Water hammering preventing structure of valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of a water hammering by a rapid stop of water flow resulting from rapid rotation of a cylinder valve element of a valve which includes an opening for passing water provided on the cylinder valve element of a cylindrical shape and a casing on an outer side, opens and cuts off a water passage, and adjusts flow rate by rotation of the cylinder valve element. SOLUTION: The valve, which is provided with openings 30 and 28 for passing water formed on the cylinder valve element 24 and the casing 26 on an outer side, opens and cuts off the water passage, and adjusts the flow rate in accordance by the rotation of the cylinder valve element 24, includes a taper shaped part 34 which is formed on the opening 30 and has an opening width reduced toward a circumferential direction and a direction for closing the water passage. The taper shaped part 34 is formed so as to protrude from the opening 28 in a circumferential direction in a state that the water passage is fully opened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for preventing water hammer of a valve in a faucet or the like, and more particularly, to a structure for preventing water hammer in a valve having a cylindrical cylinder valve body and a cylindrical casing outside thereof. About.

[0002]

2. Description of the Related Art Conventionally, in a plumbing device such as a faucet, a water passage opening penetrating inward and outward is formed at a predetermined position in a circumferential direction of a cylindrical cylinder valve body and a cylindrical casing outside thereof. A valve of a type that opens a water channel by matching each opening to the overlapping state with the rotation of the cylinder valve body with respect to the casing, and shuts off the water channel or adjusts the amount of water by mismatching the openings or changing the overlapping area. Is used.

FIGS. 4 (A) and 4 (A) show a valve of this type in a state where the opening 30A of the cylinder valve body and the opening 28A of the casing completely coincide with each other to open the water passage, and FIG. The rotation of the body (rotation by 90 °) completely disagrees with the opening 30A of the cylinder valve body and the opening 28A of the casing, and shows a state where the water passage is shut off.

[0004]

Heretofore, in various types of plumbing equipment, it has been considered that a water hammer phenomenon, that is, a so-called water hammer, is caused by a sudden stop of a water flow when a valve or the like is suddenly closed. I have.

Similarly, in the case of this type of valve, similarly, from the open state of the water channel, that is, the state shown in FIG. Then, there is a problem that a water hammer is generated due to a sudden stop of the water flow. When such a water hammer occurs, a sudden increase in pressure occurs in the piping, and the piping system vibrates or generates noise due to the vibration, or excessive pressure acts on the sealing portion to seal the pipe. Can cause damage and leakage from it.

[0006]

The water hammer prevention structure for a valve according to the present invention has been devised to solve such a problem. According to the first aspect of the present invention, water-passing openings penetrating inward and outward are formed at predetermined positions in the circumferential direction of the cylindrical cylinder valve body and the outer cylindrical casing, respectively. In a valve of a type in which a water channel is opened by matching each opening to an overlapping state with rotation of a cylinder valve body and a water channel is interrupted or water amount is adjusted by mismatching or changing an overlapping area of each opening, the cylinder Opening of valve body and / or
Or, a state in which a tapered portion whose opening width decreases in the circumferential direction and in the direction to close the water passage is formed in the opening of the casing, and the opening of the cylinder valve body matches the opening of the casing to completely open the water passage. The opening of the cylinder valve body and the casing is formed so that the tapered portion protrudes in the circumferential direction from the opening of the casing or the opening of the cylinder valve body.

According to a second aspect, in the first aspect, a plurality of the openings are provided at the same circumferential position of the cylinder valve body and the casing, and the plurality of openings are provided in the same circumferential direction of the cylinder valve body and / or the casing. The tapered portion is formed in any of the plurality of openings at the position, and the tapered portion is not formed in the remaining openings.

[0008]

As described above, according to the present invention, at least one of the opening of the cylinder valve body and the opening of the casing is formed with a tapered portion tapering in the circumferential direction and in the direction to close the water channel, and According to the present invention, the water channel is formed by forming the tapered portion such that the tapered portion protrudes in the circumferential direction from the opening of the casing or the opening of the cylinder valve body in a state where the water channel is completely opened. When the cylinder valve body is rotated from the fully opened state to a state in which the water path is cut off, the water path is not suddenly cut off even if the cylinder valve body is rapidly rotated due to the presence of the tapered portion. Immediately before the cutoff, the water flow is gradually reduced, and finally enters the cutoff state. Therefore, according to the present invention, the sudden stop of the water flow is effectively avoided, and the occurrence of the water hammer due to the sudden stop of the water flow is favorably prevented.

In the present invention, a plurality of openings are provided at the same circumferential position of the cylinder valve body and the casing, and the tapered portion is formed in any one of them, and the remaining one is formed in such a manner. The tapered portion can be prevented from being formed (claim 2). By doing so, it is possible to finally close the water channel while squeezing the water flow just before closing the water channel.

For example, when a plurality of openings are provided,
If any of the above-mentioned tapered portions is provided, the water flow cannot be sufficiently reduced immediately before the water channel is shut off, and as a result, the water channel is relatively rapidly shut by further rotation of the cylinder valve body. Therefore, it is difficult to sufficiently prevent water hammer. However, claim 2
Since the tapered portion is provided only in any one of the plurality of openings, the water hammer can be effectively prevented.

In the present invention, the opening of the cylinder valve body and the opening of the casing completely coincide with each other, that is, from a state in which the water channel is completely opened to a state in which the opening of the water channel is completely mismatched, and a state in which the opening is completely mismatched, by 100 ° or more. Preferably, the cylinder valve body can be rotated by 120 ° or more. However, the upper limit is desirably 170 °.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. In FIG. 1, reference numeral 10 denotes a faucet attached to a wall 12 (in this example, a washing machine faucet), 14 denotes a main body of the faucet 10, 16 denotes a water discharge pipe extending therefrom, 18 denotes water discharge and stop water. It is a handle for water volume adjustment.

[0013] As shown in FIG.
The valve 2 for controlling the opening or closing of the water channel 20
2 are incorporated. This valve 22 is connected to the handle 1
8 and a cylindrical valve body 24 which rotates integrally with the cylindrical valve body 8 and a cylindrical casing 26 outside the cylindrical valve body 24.

As shown in FIG.
Are provided with two openings 28 for water passage at predetermined positions in the circumferential direction and at the same circumferential position. Similarly, in the cylinder valve body 24, two corresponding openings 30 for water flow are provided at the same circumferential position. In the case of the valve 22 of this embodiment having the casing 26 and the cylinder valve body 24, the cylinder valve body 24 is rotated by operating the handle 18, and the openings 30, 30 of the cylinder valve body 24 are connected to the openings 28, 28 of the casing 26. The water channel 20 is completely opened in the matched state, and the water sent through the water channel 20 is discharged from the water discharge pipe 16 to the outside.

On the other hand, the operation of the handle 18 causes the cylinder valve body 24 to rotate to a position different from the above-mentioned position, and the openings 30, 30 of the cylinder valve body 24 and the openings 28, 28 of the casing 26 are completely inconsistent. At this point, the water channel 20 is shut off, and the water discharge from the water discharge pipe 16 stops. Further, in a state where the openings 30 and 30 of the cylinder valve body 24 and the openings 28 and 28 of the casing 26 overlap and the overlapping area changes, the amount of water discharged from the water discharge pipe 16 is adjusted.

As shown in FIG. 4B, the openings 28, 28 of the casing 26 have the same size as the openings 30, 30 of the cylinder valve body 24 except for a tapered portion 34, which will be described later. Is considered to be large.

As shown in FIGS. 3 and 4, in this embodiment, one of the two openings 30, 30 of the cylinder valve element 24 has a flat surface that tapers in the circumferential direction and the direction in which the water passage 20 is closed. Tapered portion 34 having a substantially triangular shape
Are formed. This tapered portion 34 is similar to that shown in FIG.
(B) As shown in (a), the openings 30 and 28 are formed in a position and a shape that coincide with each other and protrude from the opening 28 in the circumferential direction in a state where the water channel 20 is completely opened.

That is, as shown in FIG. 4A, in the conventional valve, the opening 30A of the cylinder valve body is formed so as to completely fit inside the opening 28A of the casing. The entirety of the opening 30 except for the tapered portion 34 is accommodated in the opening 28, and each of the openings 30, 28 is configured such that only the tapered portion 34 protrudes from the opening 28 in the circumferential direction. The tapered portion 34
The openings 30 and 28 are formed so that the entirety of the other openings 30 that do not have the hole are accommodated in the openings 28 of the casing 26 with the water channel 20 fully opened.

In the case of the valve 22 in the faucet 10 of this embodiment, the openings 30 of the cylinder valve
6, the water in the water channel 20 is opened at the maximum flow rate when the water channel 20 is completely opened so as to coincide with the openings 28, 28.
8 and flows out through the water discharge pipe 16 to the outside. At this time, as shown in FIGS.
One of the tapered portions 34 of 0, 30 protrudes from the corresponding opening 28 in the circumferential direction.

When the cylinder valve body 24 is rotated by the handle 18 from this state, the openings 30, 30, and 28,
28 overlap with each other, and the amount of water decreases as the overlapping area decreases. Then, when the cylinder valve element 24 is rotated by exactly 90 ° from the completely open state of the water channel 20, one opening 30 in the cylinder valve element 24 becomes the corresponding opening 2 of the casing 26.
8, the other opening 30 also largely disagrees with the corresponding opening 28, and only the tapered portion 34 extending in the circumferential direction overlaps the corresponding opening 28. Become.

Therefore, at this stage, the water channel 20 is not completely shut off, and a predetermined amount of water passes through the valve 22 through the tapered portion 34 and flows out of the water discharge pipe 16. That is, by forming such a tapered portion 34, the water flow is restricted immediately before the water channel 20 is completely shut off.

When the cylinder valve body 24 is further rotated by the handle 18 from this stage, the tapered portion 34 also does not coincide with the corresponding opening 28, and the openings 30 and 28 are all closed. . That is, the water channel 20 is completely shut off here.
As a result, the water discharge from the water discharge pipe 16 stops.

In the case of this embodiment, the cylinder valve body 24 is turned 90 ° from the completely open state of the water channel 20 shown in FIGS.
When rotated, the state shown in (b), that is, only the tapered portion 34 partially overlaps the opening 28 of the casing 26, and is exactly 135 ° from the initial position.
When the rotary operation is performed, the state shown in (c), that is, the tapered portion 34 also comes out of the opening 28.

As described above, in the case of the valve 22 of this embodiment, it is assumed that when the cylinder valve body 24 is rotated from the state in which the water path 20 is completely opened to shut off the water path 20, the cylinder valve body 24 is rapidly rotated. The water channel 20 is not abruptly shut off due to the presence of the tapered shape portion 34, and the water flow is gradually reduced immediately before the water channel 20 is shut off, and finally enters the shutoff state. Therefore, in the valve 22 of the present embodiment, the sudden stop of the water flow is effectively avoided, and the occurrence of the water hammer due to the sudden stop of the water flow is favorably prevented.

In this embodiment, a tapered portion 34 is formed only in one of the two openings 30 at the same circumferential position in the cylinder valve body 24, and such a tapered portion 34 is formed in other ones. Water channel 20
The waterway 20 can be finally shut off while the water flow is squeezed satisfactorily just before shutting off.

That is, if the tapered portion 34 as described above is provided in each of the two openings 30, 30, it is not possible to squeeze the water flow just before the water channel 20 is shut off. Sometimes, the waterway 20 is shut off relatively rapidly, and the water hammer may not always be sufficiently prevented. However, in this example, two openings 3
Since the tapered portion 34 is provided on only one of the channels 0 and 30, the water channel 20 can be finally shut off while squeezing the water flow when the water channel 20 is shut off, thereby effectively preventing the occurrence of water hammer. be able to.

It is to be noted that a tapered portion 34 is provided in each of the openings 30, 30, and the tapered portions 34 are formed to be thin, respectively, and the two tapered portions 34 are formed.
Can be considered to be the same as the opening width in the case where the tapered portion 34 is provided in only one of the openings 30, 30. The problem is that a troublesome sound is generated. On the other hand, in this example, since the tapered portion 34 is provided only in one of the openings 30, such a problem does not occur.

FIGS. 5 to 7 show another embodiment of the present invention. This example shows an example of application to a shower bath faucet that performs bath spouting and shower spouting. In FIG. 5, reference numeral 36 denotes a temperature control unit in the shower bath faucet (faucet 35), and 38 denotes a switching unit. , 40 is a temperature control handle, 42 is a switching handle, and 52 is a cover plate.

The temperature control unit 36 has a pair of supply pipes 4.
4 are connected, and water and hot water are supplied to the temperature control unit 36 through the supply pipes 44, respectively. The supplied water and hot water are mixed inside the temperature control unit 36, and the mixed water flows into the switching unit 38 through the connection pipe 46. Thus, the mixed water that has flowed into the switching unit 38 by operating the switching handle 42 is discharged from the water discharge pipe 48 into the bath, or sent out to the shower head through the shower outlet 50.

FIG. 6 shows the internal structure of the switching unit 38. As shown in the drawing, a valve 56 for switching the water passage 20 is incorporated in the main body 54 in the switching unit 38. The valve 56 has a cylindrical cylinder valve body 58 that rotates integrally with the switching handle 42, and a cylindrical casing 60 outside the cylinder valve body 58.

As shown in FIG.
Have openings 62-1 and 62-1 for water passage at the same circumferential position.
And 62-2, 62-2. On the other hand, the cylinder valve body 58 has a water passage opening 64-
1, 64-1 and 64-2, 64-2. The openings 64-1, 64-1 and 6 of the cylinder valve body 58
4-2 and 64-2 are provided shifted by 90 ° in the circumferential direction.

In this embodiment, one of the openings 64-1 and 64-1 of the cylinder valve body 58 is provided with the same tapered portion 34 as described above. Furthermore, the other opening 64-2,
Similarly, a tapered portion 34 is formed on one side of 64-2.

In this example, by operating the switching handle 42 to rotate the cylinder valve body 58, the water discharge pipe 4
8 and water from the shower outlet 50 are switched. Specifically, the opening 64-1 of the cylinder valve body 58,
The water path 20 of the mixed water is switched to the water discharge pipe 48 in a state where the opening 64-1 coincides with the openings 62-1 and 62-1 of the casing 60, and further from this state, the cylinder valve body 58 rotates and the opening 64 −2, 64-2 coincides with the openings 62-2, 62-2 of the casing 60 and the mixed water channel 2
0 is switched to the shower outlet 50 side. Each opening 6
The shapes and positional relationships between 2-1 and 62-2 and 64-1 and 64-2, and the shapes and positional relationships between the tapered portions 34 are the same as those in the above embodiment.

Also in the present embodiment, when switching or shutting off the water passage 20 by rotating the cylinder valve body 58, the sharp cut off of the water passage 20, that is, the sudden stop of the water flow, is effectively achieved by the tapered portion 34. This avoids the occurrence of water hammer due to the sudden stop of the water flow.

Although the embodiment of the present invention has been described in detail, this is merely an example. For example, the valve of the present invention can be applied to valves in various faucets other than the washing machine faucet and shower bath faucet, or a valve of a plumbing device other than such a faucet. For example, the present invention can be configured in variously modified forms without departing from the gist of the present invention.

[Brief description of the drawings]

FIG. 1 is a view showing a faucet including a valve according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a valve incorporated in the faucet of FIG. 1 and a peripheral portion thereof.

FIG. 3 is an exploded view of the valve in FIG. 2;

FIG. 4 is an operation explanatory view showing the operation of the valve of FIGS. 2 and 3 in comparison with the operation of a conventional valve.

FIG. 5 is a view showing a shower bath faucet including a valve according to another embodiment of the present invention.

FIG. 6 is a partially cutaway view showing the internal structure of the switching unit in FIG. 5;

7 is an exploded view of the valve in FIG. 6;

[Explanation of symbols]

20 water channel 22, 56 valve 24, 58 cylinder valve body 26, 60 casing 28, 30, 62-1, 62-2, 64-1, 64-2
Opening 34 Tapered section

Claims (2)

[Claims] 1. A water passage opening penetrating inward and outward is formed at a predetermined position in a circumferential direction of a cylindrical cylinder valve body and an outer cylindrical casing thereof, and the cylinder valve body rotates with respect to the casing. In the valve of the type of opening the water channel by matching each opening to the overlapping state in accordance with the, and opening or closing the water channel by mismatching or changing the overlapping area of each opening, the opening of the cylinder valve body and And / or forming a tapered portion in the opening of the casing in which the opening width decreases in the circumferential direction and in the direction of closing the water passage, and the opening of the cylinder valve body matches the opening of the casing to completely open the water passage. In the state, the tapered shape portion protrudes in the circumferential direction from the opening of the casing or the opening of the cylinder valve body,
A water hammer prevention structure for a valve, wherein an opening of the cylinder valve body and the casing is formed. 2. The plurality of openings according to claim 1, wherein the plurality of openings are provided at the same circumferential position of the cylinder valve body and the casing, and the plurality of openings are provided at the same circumferential position of the cylinder valve body and / or the casing. The water hammer prevention structure for a valve, wherein the tapered portion is formed in any one of the above, and the tapered portion is not formed in the remaining opening.