JPH0753013Y2 - Check valve stopper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a stopper for a check valve, and in particular, it alleviates the impact when a valve body to be opened collides with a valve box, and The present invention relates to a technique for extending the life of a check valve by preventing damage to an elastic material covered stopper that sets the maximum opening of the check valve.

[Prior Art] For example, in a check valve installed in a piping system that transports a metal corrosive fluid (rusting fluid), such as seawater transportation piping, in order to improve corrosion resistance, A check valve having a rubber lining structure is used in which the outer surface of the valve body is covered with a rubber lining layer and the inner surface of the valve box is also covered with the rubber lining layer.

In this type of conventional check valve, as shown in FIGS. 5 and 6, a valve body 1 whose outer surface is covered with a rubber lining layer 1a is covered with a valve box 2 whose inner surface is covered with a rubber lining layer 2a. It is fixed to the valve rod 4 which is rotatably supported by both axial support parts 3A and 3B and is liquid-tightly or airtightly, and is rotated in the valve opening direction by the forward fluid pressure (arrow X1 in FIG. 5) in the valve box 2. (Counterclockwise in Fig. 5) and reverse fluid pressure (arrow X2 in Fig. 5)
By the rotation in the valve closing direction (clockwise in FIG. 5), the elastic seat portion 1A of the valve body 1 is brought into contact with the elastic seat portion 2A of the valve box 2 to open and close.

By the way, in this type of check valve, in order to reduce the impact when the valve body 1 to be opened collides with the valve box 2 and to set the maximum opening degree of the valve body 1, an elastic material covered stopper is provided. 5A and 5B project from the valve body 1 side and the valve box 2 side toward the other side.

These stoppers 5A, 5B are base materials 7A, 7B in which concave portions 6 having a circular cross section or a rectangular cross section are formed on the surfaces facing the other side, that is, the respective tip surfaces of the stoppers 5A, 5B, and the base materials 7A, 7B.
The surface is made of an elastic material 8 made of, for example, natural rubber and covered with an adhesive. Therefore, when the valve body 1 rotates in the valve opening direction due to the forward fluid pressure in the valve box 2, the base material of the stopper 5A on the valve body 1 side
The elastic material 8 that covers the surface of 7A collides with the elastic material 8 that covers the surface of the base material 7A in the stopper 5A on the valve box 2 side, and the impact at the time of collision impacts both elastic materials 8,8. The elasticity is used for absorption and relaxation, and the maximum opening of the valve body 1 is set.

[Problems to be solved by the invention] However, in the conventional elastic material covered stoppers 5A, 5B,
Due to the few collisions, as shown in FIG.
Since cracks will occur in the elastic material and damage the elastic material coated stoppers 5A, 5B, corrosive fluid will invade from there and corrode the metallic base materials 7A, 7B, which will be a factor that shortens the life of the check valve. ing.

The reason is that the concave portions 6 formed in the base materials 7A and 7B have a circular or rectangular cross section, and that the tip of the elastic material 8 that covers the surface of the base materials 7A and 7B is formed flat. It can be said that it is because there is.

That is, the elastic material 8 corresponds to a cylindrical or prismatic fitting portion 8A (intersecting diagonally shaded portion) fitted in the recess 6 and restrained from elastic deformation and the front side of the cylindrical or prismatic portion 8A. The degree of restraint of elastic deformation is high on the cylindrical or prismatic portion 8A side, and gradually decreases toward the front surface side. The cylindrical or prismatic central exposed portion 8B (the right-down diagonally shaded portion) and the outer periphery of the central exposed portion 8B. Since the structure has the outer peripheral exposed portion 8C (the left-down diagonally shaded portion) which is located at the same height level and is not constrained by elastic deformation, a high load is applied to the elastic member 8 due to the collision, and the imaginary line is present here. When the elastic deformation as shown occurs, the elastic deformation amount of the outer peripheral exposed portion 8C and the central exposed portion
A relatively large difference occurs in the elastic deformation amount of 8B, particularly on the cylindrical or prismatic portion 8A side, and a large tensile load is applied to the thin boundary C between the outer peripheral exposed portion 8C and the central exposed portion 8B. It is thought to be from.

The present invention has been made in view of such circumstances, and an object thereof is to provide a check valve stopper capable of preventing the elastic material-coated stopper from being damaged and prolonging the life of the check valve.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention is characterized in that a valve body is fixed to a valve rod that is rotatably and liquid-tightly or air-tightly supported on both side shaft supports of a valve box, The valve body seat opens and closes by opening and closing the seat of the valve body by the rotation of the valve opening in the valve box due to the forward fluid pressure and the rotation in the valve closing direction due to the reverse fluid pressure. A non-return check in which elastic material coated stoppers that reduce the impact when the valve body collides with the valve box and set the maximum opening of the valve body are projected from the valve body side and the valve box side toward the other side. In the valve, at least one of the stoppers is a base material that projects from either the valve body side or the valve box side to form a recess on the surface facing the other side, and the surface of the base material is adhesively coated and the recess The corresponding part is made of elastic material that protrudes thickly toward the other side. It is what

Further, at least one opposite side of the stopper is provided with an arc-shaped tip surface of the base material protruding from either the valve body side or the valve box side, and the tip surface adhered to this tip surface. The cross-sectional shape of the elastic material may be formed into a convex lens shape by the elastic material covering the.

[Operation] According to the present invention, since the portion of the elastic material corresponding to the concave portion of the base material is formed so as to project in a thick wall shape toward the other side, a high load due to a collision is applied to the thick wall projection portion. Will be loaded, and the main elastic deformation will occur here.

The degree of restraint of elastic deformation of the thick protrusion is high on the concave side,
Since it gradually decreases toward the front surface side, the difference in elastic deformation amount between the thick-walled protrusion and the other portion is limited to a small value at the boundary. Therefore, a small shear load is applied to the boundary between the thick protrusion and the other portion. Moreover, since the boundary of a large area intersecting the axial direction of the stopper corresponds to the small shear load, cracks are not generated by the shear load.

Further, at least one opposite side of the stopper is provided with an arc-shaped tip surface of the base material protruding from either the valve body side or the valve box side, and the tip surface adhered to this tip surface. Since the cross-sectional shape of the elastic material is formed into a convex lens shape by the elastic material that covers the elastic material, a high load due to a collision is applied to the convex lens-shaped elastic material, and the main elastic deformation occurs here. Become.

The degree of elastic deformation restraint of the convex lens-shaped elastic material is high on the base material side and gradually decreases toward the front surface side.Therefore, the relative movement amount at the boundary between the convex lens-shaped elastic material and the base material, that is, between the bonding surfaces by the adhesive material The relative displacement amount at is limited to a small value. Moreover, since the elastic deformation of the elastic material on the base material side can be released in the radial outward direction along the arc of the convex lens shape, the stress of the elastic material does not locally increase, and therefore the elastic material is damaged by the occurrence of cracks. Never be done.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical sectional side view of a check valve to which a first embodiment of the present invention is applied. The feature of the present invention relates to the structure of the elastic material covered stoppers 5A and 5B, and other members and the configuration other than this are the same as those of the conventional example, and therefore correspond to FIGS. 5 to 7 in FIG. The parts are denoted by the same reference numerals, and detailed description thereof will be omitted.

The stopper 5A protruding from the valve box 2 side in the elastic material covered stoppers 5A and 5B is adhered to the base material 7A in which the concave portion 6 is formed on the surface facing the stopper 5B on the valve body 1 side and the surface of the base material 7A. Material (not shown) for adhesive coating, and the recess 6
Is formed by an elastic material 8 made of, for example, natural rubber, which projects toward the other side in a thick shape having a substantially trapezoidal cross section. With such a configuration, the forward fluid pressure (arrow X1 When the valve body 1 is rotated in the valve opening direction by), the elastic material 8 covering the surface of the base material 7B in the stopper 5B on the valve body 1 side.
However, it collides with the elastic material 8 covering the surface of the base material 7A in the stopper 5A on the valve box 2 side, and the impact at the time of collision is absorbed and relaxed by the elasticity of both elastic materials 8,8.

In particular, the base material of the elastic material 8 of the stopper 5A on the valve box 2 side
The thick-walled protruding portion 9 is formed since the thick-walled protruding portion 9 is formed corresponding to the recessed portion 6 of 7A toward the other side.
A high load due to a collision is applied to and elastically deforms as shown by the phantom line in FIG.

The degree of restraint of elastic deformation of the thick-walled protrusion 9 is high on the concave portion 6 side of the base material 7A and gradually decreases toward the front surface side. Therefore, the elastic deformation amount of the thick-walled protrusion 6 and other portions is The difference is small limited at the boundary x. Therefore, a small shear load (see arrow) is applied to the boundary x. Moreover, since the boundary x having a large area intersecting the axial direction of the stopper 5A corresponds to the small shear load, cracks are not generated at the boundary x due to the shear load. That is, since the elastic material 8 is not damaged by the generation of cracks, the corrosion of the metal base material 7A due to the invasion of the corrosive fluid is reliably prevented, and the life of the check valve can be extended.

Further, the elastic member 8 of the stopper 5A on the valve box 2 side is formed with the protruding portion 9 that protrudes in a thick-walled shape toward the other side, so that the impact when the stoppers 5A and 5B collide is absorbed. Since the relaxation characteristic is improved, even if the elastic member 8 of the stopper 5B on the valve body 2 side is formed in the same manner as the conventional one as shown in the drawing, the elastic member 8 is not cracked.

FIG. 3 is a vertical sectional side view of the check valve to which the second embodiment of the present invention is applied. In this embodiment, the elastic material covered stopper 5 is used.
A portion of the stopper 5A protruding from the valve box 2 side in A and 5B, which is opposed to the stopper 5B on the valve body 1 side, has a front end surface 7a recessed in an arc shape of a base material 7A protruding from the valve box 2 side, This tip surface
The elastic member 8 adhered to 7a and covering the front end surface 7a has a structure in which the sectional shape of the elastic member 8 is formed into a convex lens shape 10.

With such a configuration, when the valve body 1 is rotated in the valve opening direction by the forward fluid pressure (arrow X1), the elastic material 8 covering the surface of the base material 7B of the stopper 5B on the valve body 1 side.
Collides with the elastic member 8 having a cross-sectional shape of the convex lens shape 10 covering the arcuately concave tip surface 7a of the base material 7A in the stopper 5A on the valve box 2 side, and the impact when the collision occurs The elasticity of the elastic members 8, 8 absorbs and relaxes.

Particularly, the end surface 7a of the stopper 5A facing the stopper 5B is recessed in an arc shape of the base material 7A protruding from the valve box 2 side.
Since the elastic material 8 is adhered to the tip surface 7a and covers the tip surface 7a, the cross-sectional shape of the elastic material 8 is formed into a convex lens shape, so that the elastic material 8 of the convex lens shape 10 collides. A high load is applied to cause elastic deformation as shown by the phantom line in FIG.

The elastic deformation constraint degree of the elastic material 8 having the convex lens shape 10 in cross section is high on the side of the base material 7A adhered by the adhesive material and gradually decreases from this side to the surface side. The relative movement amount at the boundary with the base material 7A is limited to a small value. Moreover, since the elastic deformation of the elastic material 8 on the base material 7A side can be released radially outward along the smooth arc of the convex lens shape 10, the stress of the elastic material 8 does not locally increase. Since No. 8 is not damaged by the generation of cracks, corrosion of the metallic base material 7A due to invasion of corrosive fluid is reliably prevented, and the life of the check valve can be extended.

Further, the cross-sectional shape of the elastic member 8 of the stopper 5A on the side of the valve box 2 facing the stopper 5B on the side of the valve body 1 is a convex lens shape.
Since it is formed in 10, the absorption and relaxation characteristics of the impact when both stoppers 5A and 5B collide with each other are improved, so that the elastic member 8 of the stopper 5B on the valve body 2 side can be formed as in the conventional case as shown in the drawing. Even if formed, the elastic material 8 does not crack.

With a shock resistance test, a conventional stopper can generate a shock of 3
Even though the elastic material 8 was cracked by the addition, the stopper described in the first embodiment had a crack of 80.
When the impact is applied twice, the elastic material 8 cracks,
Further, it was confirmed that the stopper described in the second embodiment generated cracks in the elastic material 8 when the impact was applied 120 times.

In addition, in each of the above-mentioned embodiments, the stopper 5A on the valve box 2 side has been described, but the present invention is not limited to the above-mentioned embodiment, and only the stopper 5B on the valve body 1 side is described above. Stopper 5A, 5B
Even if both of them are configured in the same manner as the stopper 5A described above, the same operational effect as that of the above-described embodiment can be obtained.

[Advantages of the Invention] Since the present invention is configured as described above, it has the following effects.

That is, in the stopper for a check valve according to claim (1), a heavy load due to a collision is applied to the thick-walled projecting portion, so that the main elastic deformation occurs, so that the thick-walled protrusion is formed. Since the degree of restraint of elastic deformation of the protrusion is high on the concave side and gradually decreases toward the front side, the difference in elastic deformation between the thick protrusion and other portions is limited to a small value at the boundary. Therefore, a small shear load is applied to the boundary between the thick protrusion and the other portion. Moreover, since the boundary of a large area intersecting the axial direction of the stopper corresponds to the small shear load, cracks are not generated by the shear load. That is, since the elastic material is not damaged by the generation of cracks, the corrosion of the base material due to the invasion of the corrosive fluid is reliably prevented, and the life of the check valve can be extended.

Further, in the check valve stopper according to claim (2), a high load due to a collision is applied to the convex lens-shaped elastic material, and the elastic deformation mainly occurs there. Since the elastic deformation constraint of is higher on the base material side and gradually lowers on the surface side, the relative movement amount at the boundary between the convex lens-shaped elastic material and the base material, that is, the relative displacement amount between the adhesive surfaces by the adhesive material Is small and limited. Moreover, since the elastic deformation of the elastic material on the base material side can be released in the radial outward direction along the arc of the convex lens shape, the stress of the elastic material does not locally increase, and therefore the elastic material is damaged by cracks. Therefore, the corrosion of the base material due to the invasion of the corrosive fluid is reliably prevented, and the life of the check valve can be extended.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a check valve to which the first embodiment of the present invention is applied, FIG. 2 is an enlarged sectional view of an essential part, and FIG. 3 is a check valve to which the second embodiment of the present invention is applied. FIG. 4 is an enlarged cross-sectional view of the main part, FIG. 5 is a vertical side view of the check valve, FIG. 6 is a cross-sectional plan view taken along the line VI-VI in FIG. 5, and FIG. An enlarged cross section showing an example of a damaged state of a conventional stopper is obtained. 1 …… Valve 1A …… Elastic seat 2 …… Valve box 2A …… Elastic seat 3A, 3B …… Both side shaft support 4 …… Valve rod 5A, 5B …… Elastic material coating stopper 6 …… Recess 7A, 7B: Base material 7a: Tip surface recessed in an arc shape 8: Elastic material 9: Elastic material protrusion 10: Elastic lens-shaped convex material

Claims (2)

[Scope of utility model registration request] 1. A valve body is fixed to a valve rod which is rotatably supported on both sides of a valve box and is liquid-tightly or air-tightly supported, and reverses rotation in a valve opening direction due to forward fluid pressure in the valve box. The seat part of the valve body separates from and opens the seat part of the valve box by the rotation in the valve closing direction due to the directional fluid pressure, and the shock when the valve body to be opened collides with the valve box, and In a check valve in which elastic material-coated stoppers that set the maximum opening of the valve element are projected from the valve element side and the valve box side toward the other side, at least one of the stoppers is the valve element side and the valve box side. Of the base material that has a recess formed in the surface facing the other side by projecting from either of the above, and the elasticity of the base material that is adhesively coated on the surface of the base material and the portion corresponding to the recess protrudes toward the other side in a thick-walled shape A check valve stopper characterized by being formed of a material. 2. An end portion of at least one of the stoppers facing the opposite side is adhered to the tip surface of the base material protruding from either the valve body side or the valve box side, which is recessed in an arc shape. The stopper of the check valve according to claim 1, wherein the elastic material covering the tip end surface forms a convex lens-shaped cross section of the elastic material.