JPH0712250A - Check valve - Google Patents

Abstract

PURPOSE:To certainly suppress the vigorous flow in the counterflow direction and admit the fine flow in regular direction in good performance. CONSTITUTION:A device concerned is installed at the bore of a valve chest 1 formed tubularly and is composed of a valve seat 10, valve element 20, and casing 30. The valve seat 10 is structured in a rod form in which an approx. columnar minor diameter part 11 and major diameter part 12 are continued through a tapered surface 13, is made from a flexible seal material, and supported by a guide ring 14. The valve element 20 is made from a flexible seal material in a cylindrical, approx. conical form, and in its major diameter part, a flange 21 is formed while a valve port 22 is formed in the minor diameter part. The flange 21 is engaged by the guide ring 14, and the major diameter part 12 of the valve seat 10 is fitted in pressure contact in the valve port 22. The casing 30 is embodied cylindrically and surrounds the valve seat 10 and valve element 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve which is disposed in a fluid passage and permits only the fluid to flow in the forward flow direction and suppress the fluid to flow in the reverse flow direction.

[0002]

2. Description of the Related Art Conventionally, a check valve which allows only a forward flow of a fluid and suppresses a backward flow of the fluid has a tubular body formed of an elastic material and having one end largely opened. There is one in which a slit-like opening is formed at the other end by gradually reducing the diameter toward the other end from the body and flattening the other end, which is used with one end facing upstream in the forward flow direction. Is used.

[0003]

However, in the above-mentioned conventional check valve, the flat slit-like opening must be closed securely in order to surely suppress the flow in the reverse flow direction. . However, if the slit-shaped opening is surely closed, if the flow in the forward flow direction is weak, there is a problem that the slit-shaped opening is not opened and the fluid flow remains. Further, in order to allow weak flow in the forward flow direction, if the closed state of the slit-shaped opening is loosely formed, if there is momentum in the flow in the reverse flow direction, this cannot be reliably suppressed. There was a problem.

Therefore, in order to solve the above problems, the present invention provides a check valve which surely suppresses the flow of force in the backward flow direction and allows the weak flow in the forward direction. Is intended.

[0005]

In order to achieve the above object, a check valve according to the present invention is flexible and has a tapered surface 13 between a narrow cylindrical portion 11 and a large cylindrical portion 12. And a valve seat 10 which is continuously formed on the central axis 4 of an annular guide ring 14 and is supported on the side of the small-diameter portion 11 via a plurality of support bodies 15, and a cylindrical substantially conical shape by a flexible sealing material. The large diameter portion side is engaged with the outer circumference of the guide ring 14 of the valve seat 10, and the small diameter portion side has a valve opening 22 and is pressed against the outer peripheral edge of the large diameter portion 12 of the valve seat 10. And a valve body 20 that is formed in a tubular shape, and is formed on the inner periphery of the valve chamber 1 that is formed in a tubular shape, and is formed into a cylindrical shape by a sealing material. And a casing 30 surrounding the valve seat 10 and the valve body 20. It is a symptom.

[0006]

The fluid flowing in the forward flow direction is guided from the small diameter portion 11 provided on the valve seat 10 to the large diameter portion 12 side through the tapered surface 13 to the flow that diffuses around the rod-shaped valve seat 10. Even if the flow is weak, the valve opening 22 of the valve body 20 is expanded and passes through the valve chamber 1 well. Further, the fluid flowing in the reverse flow direction is applied to the valve body 2 with respect to the valve opening 22 that is in pressure contact with the large diameter portion 12 of the valve seat 10.
The valve opening 22 is further pressed along the inclination of 0, and the strong and vigorous flow is surely suppressed.

[0007]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a side sectional view showing an embodiment of the check valve according to the present invention.

As shown in FIG. 1, a tubular valve chamber 1 is formed in the flow passage for allowing the fluid to flow therein. In the valve chamber 1, only the forward flow of the fluid is allowed and the backward flow direction is allowed. A check valve mechanism is provided to prevent circulation. The check valve mechanism is roughly configured by the valve seat 10, the valve body 20, and the casing 30.

The valve seat 10 is formed of a flexible sealing material, and is formed by integrally and continuously forming a thin-diameter portion 11 and a large-diameter portion 12 having a substantially columnar shape with a tapered surface 13 interposed therebetween. Both ends thereof are formed in a spherical shape. The valve seat 10 is disposed in the inlet 2 of the valve chamber 1 in the small diameter portion 11 while the narrow diameter portion 11 side is directed to the inlet 2 (right side in the drawing) in the forward flow direction of the fluid in the valve chamber 1. It is supported by the annular guide ring 14 on the central axis 4 of the guide ring 14 via a plurality of supports 15.

The valve body 20 is formed of a flexible sealing material and has a substantially cylindrical conical shape that converges from the inlet 2 side of the valve chamber 1 toward the outlet 3 side. And
A flange portion 21 is formed on the large diameter portion side. The flange portion 21 has an inner peripheral surface that engages with the outer peripheral surface of the guide ring 14 that supports the valve seat 10, and has an outer peripheral surface that contacts the cylinder inner peripheral surface of the valve chamber 1. Further, a valve port 22 for allowing a fluid to flow is formed on the side of the converged small diameter portion. Further, the large diameter portion 1 of the valve seat 10 is provided at the valve port 22.
The opening portion is closed by inserting 2 from the flange portion 21 side.

Next, the casing 30 is a cylindrical body made of a sealing material, and is arranged along the inner peripheral surface of the valve chamber 1. One end of the valve body 20 is in contact with the flange 21 of the valve body 20, and the other end thereof is in contact with the outlet of the valve chamber 1 so that each contact portion is water-tight. Further, the valve chamber 1 is divided into two in order to assemble the check valve mechanism, but the water is stopped at this portion by the casing 30.

Therefore, in the check valve constructed as described above, the rod-shaped valve is formed by continuously forming the small-diameter portion 11 and the large-diameter portion 12 through the tapered surface 13 in the tubular valve chamber 1. The seat 10 and the valve body 20 having the valve opening 22 formed into a substantially cylindrical conical shape and converged are provided, and the large-diameter portion 12 of the valve seat 10 is fitted and press-contacted to the valve opening 22. With respect to the fluid flowing in the flow path, the valve seat 1
Since the fluid passage is formed so as to expand the valve opening 22 of the valve body 20 along the zero tapered surface 13, the fluid can be prevented from staying and the weak fluid can be satisfactorily circulated. Further, regarding the reverse flow direction, since the valve body 20 is pressed against the flexible valve seat 10 by the flowing fluid, even if the valve opening 22 is further closed and the flow of the reverse flowing fluid is vigorous, this is surely achieved. Can be suppressed. Then, the water stop of the inner circumference of the valve chamber 1 is caused by the flange portion 21 of the valve body 20 and the valve seat 1
It is carried out in a casing 30 surrounding 0.

By using different seal materials for forming the valve seat 10 and the valve body 20, respectively,
It is possible to prevent the valve portion from closing due to the sticking of the sealing material between the large diameter portion 12 of the valve seat 10 and the valve opening 22 of the valve body 20.

[0014]

As described above, the check valve according to the present invention has a rod-shaped valve seat in which a small-diameter portion and a large-diameter portion are continuously formed via a tapered surface in a tubular valve chamber. A valve body having a valve opening in a small diameter portion that is formed in a cylindrical and substantially conical shape and converges, and by fitting and pressing the large diameter portion of the valve seat into the valve opening, Since the fluid passage is formed so as to widen the valve opening of the valve body along the tapered surface of the valve seat, the fluid can be prevented from staying and the weak flow can be satisfactorily circulated. In addition, since the valve body is pressed against the flexible valve seat by the flow in the reverse flow direction, even if the valve port is further closed and the flow of the reverse fluid is vigorous, this can be reliably suppressed.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of a check valve according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Valve chamber, 4 ... Central axis, 10 ... Valve seat, 11 ... Small diameter part, 1
2 ... Large diameter part, 13 ... Tapered surface, 14 ... Guide ring, 1
5 ... Support body, 20 ... Valve body, 22 ... Valve opening, 30 ... Casing.

Claims (1)

[Claims] 1. A small-diameter portion (1) having flexibility and having a substantially cylindrical shape.
1) and the large diameter portion (12) are continuously formed by a tapered surface (13), and a plurality of supports (15) are provided on the central axis (4) of the annular guide ring (14). And a valve seat (10) whose small diameter side is supported by a flexible sealing material, and is formed into a substantially cylindrical conical shape. The large diameter side is engaged with the outer periphery of the guide ring of the valve seat, A valve body (20) having a valve opening (22) on a partial side and in pressure contact with an outer peripheral edge of a large diameter portion of the valve seat, and a valve body (1) disposed in an inner circumference of a valve chamber (1) formed in a tubular shape. And a casing (30) which is formed into a cylindrical shape by a sealing material and has one end abutting against a large diameter portion of the valve body to surround the valve seat and the periphery of the valve body. Check valve to be.