JP2529562Y2 - Ball valve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a ball valve.

[0002]

2. Description of the Related Art As a conventional ball valve and a lever, the one shown in FIG. 5 is widely known. In this ball valve, a ball c having a communication hole f is arranged in a valve chamber b of a valve body a, and a seal ring receiving groove g provided at an opening of the flow hole d of the valve body a on the valve chamber b side is provided. e. Then, the ball c is deformed for holding down, and the deformation is performed to seal the ball c. However, the attached seal ring e exerts a force in the direction of the small arrow as the ball c rotates (in the direction of the large arrow). As a result, there is a problem that the seal ring is twisted or displaced, and in some cases, comes off the seal ring receiving groove g.

A ball valve which solves this problem is disclosed in, for example, JP-A-48-24329 and JP-A-59-23.
No. 197676. In these valves, a plastic deformation portion is provided in the vicinity of the seal ring receiving groove to fix the seal ring so as to prevent twisting and displacement occurring in the seal ring. However, in these valves, a plastic deformation portion must be provided in the vicinity of the seal ring receiving groove. In forming the plastic deformation portion, a plastic deformation piece that is difficult to process is formed in advance, and the seal ring is received. It is necessary to bend and deform exactly a predetermined amount later. As a result, there is a problem that it takes a long time to attach the seal ring and the production cost is high.

The present inventor has created a ball valve shown in FIGS. In this ball valve, the seal ring is constituted by a ring main body having elasticity and a hard portion having lower elasticity than the ring main body to prevent the seal ring from being twisted or displaced.

The ball valve includes a valve body, a ball 2, and two seal rings 7, 7. The valve main body includes a main body 1 and a ball presser 4 attached to the left side of the main body 1. The valve chamber 10 is internally provided by mounting the main body 1 and the ball presser 4. A compartment is formed.

The main body 1 and the ball holding portion 4 are provided with flow holes 11 and 41, respectively, which communicate with the valve chamber 10.
In addition, seal ring receiving grooves 12 and 42 (shown in FIG. 2) for receiving the seal ring 7 are provided in the openings of the flow holes 11 and 41 on the valve chamber 10 side, respectively. An elbow 5 is provided on the ball holding section 4. One end of the elbow 5 is inserted into the flow hole 41,
Sealed by an O-ring 8 and fixed by a washer 9.

The ball 2 opens and closes a valve, and has a communication hole 21 in the center. A spindle 3 is mounted on the upper portion together with a sealing O-ring 6, and the ball 2 is rotated by rotating the spindle 3. The ball 2 is disposed in the valve chamber 10 so that the communication hole 21 can communicate with the communication holes 11 and 41 of the main body 1 and the ball holding portion 4.

As shown in FIG. 2, the seal ring 7 is formed in a ring shape having a sectional shape capable of fitting in the seal ring receiving grooves 12, 42, and is mounted in the seal ring receiving grooves 12, 42. Ball 2 and valve chamber 1
0, the upper and lower sides of the ball 2 are sealed.

The seal ring 7 includes a ring main body 7a which is in contact with the ball 2 and a seal ring receiving groove 1
And a hard portion 7b disposed on the entire end surface on the side received by the second and second members 42. The ring body 7a
It is made of elastic rubber, while the hard part 7b is
It is made of a metal plate such as stainless steel. Then, the entire seal ring 7 is formed by being adhered to the hard portion 7b of the ring-shaped plate-shaped body or the outer periphery of the ring main body 7a.

The hard portion 7b serves to prevent the seal ring 7 from being twisted or the like during use. The operation of the spindle causes the ball 2 to rotate clockwise as shown in FIG. Then, the sealing ring 7
Receives a rotational force in the left direction (Y direction in the drawing). However, the hard portion 7b opposes the above-mentioned rotational force due to its own resistance such as twisting. Incidentally, FIG.
5 shows an enlarged cross section of the present embodiment corresponding to the cross section of the seal ring e at the upper left of FIG.

Thus, in the examples shown in FIGS. 1 to 3,
The rigid portion 7b prevents the ring main body 7a from being twisted and maintains the close contact with the ball.
Unless they are integrated with the hard part 7b, such an effect cannot be produced, and a problem remains in this point.

More specifically, in order to integrally fix the hard portion 7b to the end face of the ring main body 7a, it is necessary to provide separate fixing means such as bonding. However, the ring main body 7a is made of elastic rubber, and the hard portion 7b is made of metal such as stainless steel. In order to bond different kinds of materials well, it is necessary to carefully select an adhesive. And more importantly,
Since a force that causes twisting is applied to the ring body 7 every time the ball rotates, even if good bonding is performed, this bonding will be peeled off after many years of use.
The effect of preventing torsion of the hard portion 7b is not exhibited.

[0013]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned circumstances, and its purpose is to integrate the ring main body 7a and the hard portion 7b by a simple assembling work. In addition, by being able to maintain the integration over a long period of time, it is possible to provide a low-cost ball valve in which the torsion and displacement of the seal ring do not occur even after long-term use. is there.

[0014]

According to the present invention, there is provided a valve body having a plurality of flow holes communicating with each other through a valve chamber, a ball disposed in the valve chamber for opening and closing the valve, and a valve chamber side of the flow hole. A seal ring receiving groove formed in the opening; and a seal ring mounted in the seal ring receiving groove for sealing with a ball, wherein the seal ring has an elastic ring main body, and a hard elastic body smaller in elasticity than the ring main body. The above object is attained by providing a ball valve having the following features.

In the ball valve of the present invention, the above-mentioned seal ring receiving grooves 12, 24 are provided with a groove bottom m1, and a groove peripheral wall m provided on the outer peripheral side and the inner peripheral side of the groove bottom m1.
2, m3. On the other hand, the seal ring 7 has a ring main body 7a and a hard portion 7b fitted therein. The ring main body 7a has a base end surface a1, an outer peripheral surface a2, an inner peripheral surface a3, and a distal end surface a4. A fitting portion 20 that can receive the hard portion 7b is provided around the base end surface inside the ring main body 7a. The fitting portion 20 is provided with a hard portion 7b.
Is formed so as to have the same width and thickness as the hard portion 7b so as to be able to receive the rigid portion 7b, and communicate with the outside through an opening 21 provided in the base end surface a1. This opening 21
Is formed narrower than the fitting portion 20, and the hard portion 7 b is fitted into the fitting portion 20 through the opening 21 and fixed by pushing the opening 21. Such a seal ring 7 is arranged in the seal ring receiving grooves 12 and 24, and in this arranged state, the base end face a1 of the seal ring abuts the groove bottom m1 of the seal ring receiving groove, and The outer peripheral surface a2 and the inner peripheral surface a3 are in contact with the outer peripheral side and the inner peripheral side groove peripheral wall portions m2 and m3 of the seal ring receiving groove, and the distal end surface a4 of the seal ring projects from the seal ring receiving groove and the ball 2 Is characterized by being in contact with.

[0016]

In the present invention, in order to have a hard portion inside the ring main body 7b, a force in a direction in which the seal ring 7 is twisted with the rotation of the ball or a direction in which the seal ring 7 tends to shift with respect to the seal ring receiving groove 12. When subjected to the force of, due to the resistance to twist etc. of the hard part,
Can compete. Thereby, it is possible to prevent the seal ring 7 from being twisted or displaced with respect to the seal ring receiving groove 12 during use. Further, even if a small amount of twisting or displacement occurs, there is a hard portion, so that it is possible to avoid coming off from the seal ring receiving groove 12.

Moreover, the hard portion 7b
b, the width of the opening 21 is increased.
Since it is fixed by being fitted into the fitting portion 20 from the outside, it is not necessary to use an adhesive for fixing as in the related art, and the adhesive does not peel off. More specifically, the opening 21 of the ring main body 7b that has been expanded when the hard part 7b is fitted returns to its original state (a state smaller than the width of the hard part 7b) due to the elasticity of the ring main body 7b. The base surface a1 of the seal ring provided with the opening 21 abuts against the groove bottom m1 of the seal ring receiving groove, and the outer peripheral surface a2 and the inner peripheral surface a3 of the seal ring are in contact with the outer peripheral side of the seal ring receiving groove. The inner peripheral side is in contact with the groove peripheral wall portions m2 and m3, and the distal end surface a4 of the seal ring projects from the seal ring receiving groove and is in contact with the ball 2. Therefore, after the assembly of the ball valve is completed, the opening 21
Is constantly pressed against the groove bottom m1 of the seal ring receiving groove 12 by the elastic force of the ring main body 7b. Moreover, even if the opening width is to be increased, the outer peripheral surface a2 and the inner peripheral surface a3 of the seal ring are in contact with the outer peripheral side and the inner peripheral side groove peripheral wall portions m2 and m3 of the seal ring receiving groove. The expansion of the opening 21 is restricted by the peripheral wall portions m2 and m3, and the internal hard portion 7b can be completely prevented from coming off.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 4 is a sectional view of the seal ring 7 used in the ball valve according to one embodiment of the present invention. The ball valve of this embodiment has basically the same configuration as that shown in FIGS. 1 to 3, and the overall description is the same as that of the above-described ball valve of FIGS. Therefore, the seal ring receiving groove 12 and the ball 2 are indicated by two-dot chain lines on the assumption that the seal ring 7 of FIG. 4 is used instead of the seal ring 7 of FIGS. explain.

The seal ring 7 of this embodiment is formed of a ring main body 7a and a hard portion 7b disposed around the entire circumference of the ring main body 7a.
It is arranged inside. The seal ring 7 is mounted in the seal ring receiving grooves 12 and 42 instead of the seal ring 7 of FIGS. 1 to 3, and forms a seal with the ball 2. The ring main body 7a is made of elastic fluorine rubber, while the hard portion 7b is made of a metal plate such as stainless steel. The ring main body 7a has a base end surface a1, an outer peripheral surface a2, an inner peripheral surface a3, and a distal end surface a4. A fitting portion 20 is provided around the base end surface inside the ring main body 7a, and the hard portion 7b is received in the fitting portion 20. The fitting portion 20 is formed to have the same width and thickness as the hard portion 7b so as to receive the hard portion 7b, and communicates with the outside through an opening 21 provided in the base end face a1. I have. The opening 21 is provided in the fitting portion 2
The rigid portion 7b is formed to be narrower than 0, and the hard portion 7b is fitted and fixed in the fitting portion 20 from the opening 21 by expanding the opening 21. Such a seal ring 7 is arranged in the seal ring receiving grooves 12 and 42 instead of the seal ring 7 of FIGS. In this state, the base surface a1 of the seal ring abuts against the groove bottom m1 of the seal ring receiving groove, and the outer peripheral surface a2 of the seal ring.
The inner peripheral surface a3 abuts the outer peripheral side and the inner peripheral side groove peripheral wall portions m2 and m3 of the seal ring receiving groove, and the distal end surface a4 of the seal ring projects from the seal ring receiving groove and abuts on the ball 2. In FIG. 4, a solid line indicating the distal end face a4 of the seal ring and a two-dot chain line indicating the outer circumference of the ball 2 are drawn crossing each other.
The tip surface a4 of the seal ring is deformed and comes into contact with the outer periphery of the ball 2.

The material of the seal ring 7 is not limited to the material described in the present embodiment. The ring body 7a has an elasticity enough to seal the space between the ring 2 and the ball 2 when pressed by the ball 2. What is necessary is just to have.
On the other hand, the hard portion 7b only needs to be of such a degree as to resist torsional force or the like applied by the rotation of the ball 2, and may be made of synthetic resin or the like, and can be changed as appropriate.

In this embodiment, the hard portion 7b is formed in a ring shape. However, the present invention is not limited to this. The hard portion 7b is formed of a plurality of hard members, and these hard members are formed along the circumferential direction of the ring main body 7a. May be arranged sequentially at appropriate intervals.
Further, the hard portion 7b may be composed of a hard member having a large diameter and a hard member having a small diameter, and a plurality of hard members having the same diameter may be arranged in the axial direction. Can be changed as appropriate.

[0022]

[Effects of the Invention] As described above, the present invention provides:
The ring body 7a and the hard portion 7b can be integrated with each other by a simple assembling operation, and the integration can be maintained for a long period of time. A ball valve which is not generated even by the use of a valve can be provided by a simple assembling operation.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a ball valve for explaining problems and embodiments to be solved by the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is an enlarged view for explaining a function of a seal ring of the ball valve of FIG. 1;

FIG. 4 is an enlarged sectional view of a main part of a seal ring in the ball valve according to the embodiment of the present invention;

FIG. 5 is a cross-sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body part 2 Ball 4 Ball holding part 7 Seal ring 11, 41 Communication hole 12, 42 Seal ring receiving groove 7a Ring main body 7b Hard part 20 Fitting part 21 Opening

Claims (1)

(57) [Scope of request for utility model registration] 1. A valve body having a plurality of communication holes communicating with each other via a valve chamber, a ball disposed in the valve chamber for opening and closing a valve, and a seal ring receiving member formed at an opening of the communication hole on the valve chamber side. A ball valve comprising: a groove; a seal ring mounted in the seal ring receiving groove to seal a ball; the seal ring includes a ring main body having elasticity; and a hard portion having smaller elasticity than the ring main body. In the seal ring receiving grooves (12) and (24), the groove bottom (m
1) and a groove peripheral wall portion (m2) (m3) provided on the outer peripheral side and the inner peripheral side of the groove bottom portion (m1), wherein the seal ring (7) comprises a ring main body (7a); A ring body (7a) having a base end face (a1) and an outer peripheral face (a)
2), an inner peripheral surface (a3), and a distal end surface (a4). The hard portion (7) is located near the base end surface inside the ring main body (7a).
A fitting portion (20) capable of receiving the hard portion (7) is provided around the fitting portion (20) which can receive the hard portion (7b). It is formed and communicates with the outside through an opening (21) provided in the base end surface (a1). The opening (21) is formed narrower than the fitting portion (20). The hard part (7b) is fitted and fixed from the opening (21) into the fitting part (20) by expanding the opening (21), and the seal ring (7) is sealed. Ring receiving groove (1
2) It is arranged in (24), and in this state, the base end surface (a1) of the seal ring abuts against the groove bottom (m1) of the seal ring receiving groove, and the outer peripheral surface (a2) of the seal ring The inner peripheral surface (a3) is in contact with the outer peripheral side of the seal ring receiving groove and the groove peripheral wall portions (m2) and (m3) on the inner peripheral side, and the distal end surface (a4) of the seal ring projects from the seal ring receiving groove. A ball valve contacting the ball (2).