JP3343301B2 - Flow control valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is easy to assemble, and
The present invention relates to a flow control valve that generates less noise.

[0002]

2. Description of the Related Art FIG.
There is a flow control valve B shown in FIG. In the flow regulating valve B, a bent flow path 50 is formed inside a valve casing 51, and an annular valve seat 52 is provided on one arm of the bent flow path 50. The annular valve seat 52 is formed integrally with the valve casing 51 inside the valve casing 51.
A valve body 53 that adjusts the valve opening degree by being in contact with and separating from the annular valve seat 52 is provided at a position facing the valve seat 52. The valve body 53 is connected to the tip of a valve shaft 54, and a male screw 56 is formed in the middle of the valve shaft 54. The male screw 56 is screwed with a female screw 57 provided inside a valve shaft holding cylinder 55 mounted in the valve casing 51, whereby the valve shaft 54 is rotatable in the valve shaft holding cylinder 55 and It is supported to move forward and backward. A valve body guide 59 is provided at the tip of the valve body 53,
The valve body guide 59 slides on the inner wall surface of the annular valve seat 52, so that the valve body 53 can slide in the axial direction without lateral vibration.

[0003] The other end of the valve shaft 54 protrudes outside, and this external protruding portion 58 is splined and connected to an output shaft of a motor or the like via a coupling or the like.

With the above structure, when the motor is rotated,
The valve shaft 54 and the valve body 53 integral therewith advance and retreat in the axial direction while rotating, and the peripheral edge of the valve body 53 is
2, water stoppage, running water, and flow rate adjustment can be performed.

[0005]

As described above, in the conventional flow control valve, since the valve element guide 59 is attached to the valve element 53, when the valve element 53 rotates, the valve element guide 59 also rotates. For this reason, depending on the position of the valve element 53, there is a problem that the valve element guide 59 comes to the front of the flow path 50 and hinders a smooth flow of the fluid, and cavitation generates noise. Further, since the valve body guide 59 and the valve seat 52 are separate bodies, the number of parts is increased, and the assembling work of the flow control valve is complicated.

[0006]

SUMMARY OF THE INVENTION A flow regulating valve according to the present invention, which has been made to solve the above-mentioned problems, comprises an annular valve seat provided on one arm of a bent flow path, and an annular valve seat. A valve body movable in the central axis direction, a valve body guide for guiding the valve body, and a shaft guide for rotatably mounting a shaft for moving the valve body. The shaft guide and the shaft guide are integrated. According to this configuration, the position of the valve element guide is fixed regardless of the rotation or movement of the valve element. Therefore,
By fixing the valve body guide at a predetermined desired position, fluid obstruction can be minimized.

[0007] In addition to the valve body guide and the shaft guide, an annular valve seat may be integrated. This integrally formed body may be formed of a synthetic resin for cost reduction and weight reduction.

Next, the valve guide is shaped like a beam, the cross-sectional shape of which is substantially triangular, and the apex of the triangular cross-section is directed to the upstream side in the flow direction of the fluid, whereby the flow of the valve guide is obstructed. And the generation of cavitation can be suppressed. It is desirable that the number of beams of the valve body guide is three. This is because it is difficult to guide the valve element sufficiently with two pieces, and it is easy to obstruct the flow of fluid with four pieces or more. From the viewpoint of not obstructing this flow, when the valve body guide is constituted by three beams, the two valve body guides constituting the base of the triangle formed by the three beams face the flow path. It is desirable to arrange them so that

It is desirable that the inner diameter of the valve body guide be as follows. First, when the valve body is at a position where the valve seat is not closed, a gap is provided between the valve body and the valve body guide. Then, the inner diameter of the valve body guide is set so that this gap becomes smaller as the valve body approaches the position where the valve seat closes the valve seat. This ensures that the valve element is guided by the valve element guide when the valve element closes the valve seat, and minimizes the generation of cavitation in the gap between the valve element and the valve element guide when the valve element does not close the valve seat. Restrained,
Noise is prevented.

[0010]

FIG. 1 shows a flow control valve A according to an embodiment of the present invention in a fully opened state. In this flow regulating valve A, a bent flow path 10 is formed inside two arms of a T-shaped valve main body 1, and a shaft guide 5 is fitted inside the remaining one arm. A valve body guide 9 and a valve seat 2 are connected to the front (left side in FIG. 1) of the shaft guide 5, and they are integrally formed of synthetic resin. Although the valve seat 2 has a cylindrical shape, the valve body guide 9 has a shape of three beams as shown in FIG. 2, thereby connecting the valve seat 2 and the shaft guide 5.

A metal valve shaft 4 is provided inside the shaft guide 5. The valve shaft 4 is rotatably and advancing and retracting inside the shaft guide 5 when a male screw 6 provided in the middle thereof is screwed with a female screw 7 provided on the inner surface of the shaft guide 5. . A valve body 3 is formed at the tip (left side in FIG. 1) of the valve shaft 4, and the outer diameter of the valve body 3 matches the inner diameter of the valve seat 2.

The rear end of the valve shaft 4 projects outward, and the external projection 8 is splined. The external projection 8 is connected to an output shaft such as a motor (not shown) by the spline. Accordingly, by driving the motor, the valve shaft 4 is rotated, and the valve body 3 reciprocates, and comes into contact with and separates from the valve seat 2. Thereby, the flow rate of the fluid flowing between the valve seat 2 and the valve body 3 is adjusted. At this time, the valve element 3 is guided by the valve element guide 9 in the reciprocating motion, and therefore moves smoothly without swinging.

FIG. 2 is a sectional view taken along the line II-II of FIG. In this embodiment, the valve guide 9 is composed of three beams, and each beam has a substantially triangular cross section. The apex of the triangular cross section is directed inward, that is, toward the valve body 3.
This is because, in the case of the valve of the present embodiment, as shown in FIG.
This is because the fluid flows from the center side to the outer periphery side. Thereby, the fluid resistance by the valve guide 9 is reduced, and generation of cavitation and generation of noise are prevented.

As shown in FIG. 2, the positional relationship between the three valve guides 9 and the bent flow path 10 is such that the space between the two valve guides 9 corresponding to the base of the triangle faces the fluid outlet of the valve body. It is supposed to. As a result, the liquid flowing from the fluid inlet of the curved flow passage 10 passes without being disturbed by the valve body guide 9, and is effective in preventing cavitation and reducing noise.

FIG. 3 is an enlarged view of a contact portion between the valve seat 2 and the valve body 3 in FIG. 1, and FIG. 4 is a detailed view of a portion indicated by a circle in FIG.
The diameter of a circle inscribed in the three beams of the valve body guide 9 is slightly larger than the outer diameter of the valve body 3, and is set so that a gap is formed between the valve body 3 and the valve body 3. However, the inner diameter is set so as to become smaller toward the valve seat 2. With such a structure, in the flow control valve A of the present embodiment, a gap exists between the valve body guide 9 and the valve body 3 while the valve body 3 does not close the valve seat 2. Thereby, cavitation generated in the gap between the valve body guide 9 and the valve body 3 is prevented,
Noise is reduced. However, as the valve element 3 approaches the valve seat 2, the inner diameter of the valve element guide 9 decreases, and the valve element 3 is reliably inserted into the valve seat 2.

FIG. 5 is a graph showing the relationship between the noise and the flow rate caused by changing the inner diameter of the valve body guide 9 in this manner. It can be seen that as the flow rate increases, the noise reduction effect of the flow control valve of this embodiment increases.

In the flow control valve A of the present embodiment, the shaft guide 5, the valve body guide 9 and the valve seat 2 are integrated as described above, so that the assembly can be performed easily as follows. First, the shaft O-ring 15 is mounted on the valve shaft 4 and screwed into the shaft guide 5 which is an integral part of the valve seat 2, the valve body guide 9 and the shaft guide 5. The O-ring A11 and the O-ring B12 are mounted in the O-ring groove on the outer periphery of the shaft guide 5 in which the valve shaft 4 is incorporated, and fitted into the valve body 1. Thus, the O-ring A11 in the shaft guide 5 and the O-ring A11 in the valve seat 2
The shaft guide 5 and the valve seat 2 are tightly fitted in the valve main body 1 by the ring B12.

At this time, the shaft guide 5 is fixed to the valve body 1 so that the space between the two beams of the valve body guide 9 faces the fluid outlet of the valve body 1 (FIG. 2). After the position is determined in this way, the holding plate 13 is fixed with the fixing bolts 14 to prevent the shaft guide 5 from falling off.

[0019]

In the flow control valve according to the present invention, the position of the valve body guide is fixed regardless of the rotation or movement of the valve body by integrating the valve body guide and the shaft guide. Therefore, by fixing the valve body guide at a predetermined desired position, fluid obstruction can be minimized.

Further, by integrating the annular valve seat in addition to the valve body guide and the shaft guide, cost reduction and weight reduction can be achieved. In addition, assembly becomes easy. By molding these with a synthetic resin, further cost reduction and weight reduction can be achieved.

Next, the valve guide is formed in a beam shape, the cross-sectional shape thereof is substantially triangular, and the apex of the triangular cross section is directed to the upstream side in the flow direction of the fluid. Can be minimized, and the generation of cavitation and the generation of noise can be suppressed. By setting the number of beams of this valve body guide to three and arranging two valve body guides constituting the base of the triangle formed by the three beams so as to face the flow path, The disturbance of the flow by the body guide can be further suppressed, and the generation of cavitation and the generation of noise can be prevented.

By setting the inner diameter of the valve body guide such that the gap between the valve body and the valve body becomes smaller as approaching the valve seat, cavitation is generated in the gap between the valve body and the valve body guide when the valve seat is not closed. Minimized,
Noise is prevented. Of course, when the valve element closes the valve seat, the valve element is reliably guided by the valve element guide.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a state in which a flow control valve according to an embodiment of the present invention is fully opened.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged view of a contact portion between a valve seat and a valve element.

FIG. 4 is a detailed view of a circle in FIG. 3;

FIG. 5 is a graph showing the relationship between the flow rate of the flow rate control valve of the embodiment and noise.

FIG. 6 is a cross-sectional view of a conventional flow control valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Valve main body 2 ... Valve seat 3 ... Valve body 4 ... Valve shaft 5 ... Shaft guide 6 ... Male thread 7 ... Female thread 8 ... External protruding part 9 ... Valve body guide 10 ... Bending flow path 11 ... O-ring A12 ... O-ring B 13 ... Holding plate 14 ... Fixing bolt 15 ... Shaft O-ring

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hisashi Nakamura 43-1, Uozakihama-cho, Higashi-Nada-ku, Kobe Nippon Yu-Pro Co., Ltd. Incorporated (56) References JP-A 61-44068 (JP, U) JP-A 57-30475 (JP, U) JP-A 6-22668 (JP, U) JP-A 5-27436 (JP, U U) J. 34-9170 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16K 1/00 F16K 47/02

Claims (3)

(57) [Claims] An annular valve seat provided on one arm of a bent flow path; a valve body movable in a central axis direction of the annular valve seat;
In a flow regulating valve having a valve guide for guiding a valve body and a shaft guide rotatably mounting a shaft for moving the valve, a valve guide and a shaft guide are integrated with each other. The approximate triangular cross section
The shape of the beam has a cross section, and the apex of the triangle
A flow regulating valve characterized in that it is directed to the upstream side of the flow direction. 2. The flow regulating valve according to claim 1, wherein the valve body guide comprises three beams. 3. The valve guide according to claim 2, wherein a space between two valve guides forming a base of a triangle formed by three beams of the valve guide is opposed to the flow path. Flow control valve.