JPH05332464A - Check valve - Google Patents

Abstract

PURPOSE:To improve the reliability of the structure of machine by preventing the sudden collision of a valve body with a valve guide to prevent the generation of damage of composing parts. CONSTITUTION:The lower end side of a valve guide 8 is formed with an opening 18, and the other end side is closed. The upper end of a valve rod 20 of a valve body 10 is inserted from the opening 18 of this valve guide 8 freely to move. At the time when the fluid is moved from a chamber A to a chamber B and a valve seat 22 of the valve body 10 is moved with this movement of the fluid in the same direction, the fluid inside of a space between the inner surface of the upper end side of the valve guide 8 and the upper end side of the valve rod 20 is pushed out from the inside of the valve guide 8 to work as a damper, and the sudden movement of the valve seat 22 is hindered to prevent the collision of the valve seat 22 with the valve guide 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve for shutting off a reverse flow of fluid in a casing.

[0002]

2. Description of the Related Art FIG. 7 is a cross-sectional view of a conventional check valve. A casing 2 shown in FIG. 7 has a fluid flowing from the chamber A direction to the chamber B direction in the casing 2. A check valve 4 of a conventional example is attached to an inner peripheral wall of the casing 2 in order to block a fluid from flowing backward from the above direction. The check valve 4 has a valve support 6, a valve guide 8, and a valve body 10 as basic components.

The valve support 6 has an opening 12 penetrating the chamber A and the chamber B and has an inverted conical shape at the mounting position shown in the drawing. The outer peripheral end of the valve support 6 has an inner peripheral wall step 14 of the casing 2.
And the retaining ring 16 embedded in the casing 2, and is fixed to the inner peripheral wall of the casing 2.

The valve guide 8 is supported in the casing 2 through the valve support 6 by being joined to the center of the valve support 6, and has a cylindrical shape in which both ends in the direction from the chamber A to the chamber B are open. The valve body 10 is inserted into the inside from the lower end side opening 18.

The valve body 10 has a valve seat 22 fixed to the lower end side of the valve rod 20, and the upper end side of the valve rod 20 moves from the lower end side opening 18 of the valve guide 8 into the inside thereof. It is inserted as possible. The valve seat 22 is the casing 2
When the valve rod 20 has a larger outer diameter than the inner diameter of the stepped portion 24 formed so as to slide downward in the valve guide 8, the valve rod 20 is accordingly seated on the stepped portion 24 and the chamber It acts to block the reverse flow of fluid from B to chamber B.

Specifically, when the pressure inside the chamber A above the casing 2 is higher than the pressure inside the chamber B, the fluid tries to flow from the chamber A toward the chamber B. As a result of the valve seat 22 being pushed upward by the pressure, the fluid flows in the casing 2 in the forward direction from the chamber A to the chamber B as indicated by the arrow.
On the other hand, when the pressure in the chamber B becomes higher than the pressure in the chamber A, the fluid tries to flow backward, but the pressure accompanying this pushes the valve seat 22 in the reverse flow direction, and as a result, the valve seat 22 is opened. The flow path between the chamber A and the chamber B is blocked by being seated on the step portion 24 in the casing 2 and the backflow is blocked.

[0007]

However, in the check valve 4 having the above-described structure, when the pressure in the chamber A suddenly becomes higher than the pressure in the chamber B, the pressure at which the valve seat 22 sharply rises. As a result, the check valve 4 such as the valve guide 8 or the valve support 6 is strongly collided with the lower end side of the valve guide 8 as a result of being moved toward the valve guide 8 at high speed.
An excessive impact load at the time of the collision will be applied to the component parts of.

When such a shock load is repeatedly applied and the durability of the check valve components is exceeded, the valve support becomes loose and the valve guide 8 is deformed, so that the reverse flow of the fluid is effective. As a result, the function as a check valve, such as the inability to shut off the valve, deteriorates and the reliability of the mechanical structure is significantly lost.

Therefore, in the present invention, a force for moving the valve element at high speed in the valve guide direction acts due to a sudden change in pressure in the chambers on both sides of the check valve. In addition, the impact load can be lightly mitigated so that the valve body does not suddenly collide with the valve guide, and damage to its components does not occur, improving the mechanical structural reliability described above. The purpose is to be able to.

[0010]

According to the present invention, a valve body and a valve guide are provided, and the valve body has a valve seat fixed to one end side of a valve rod, and the valve guide has a cylindrical shape. And the other end side of the valve rod is inserted from the one end side opening, and the insertion valve rod has a structure in which the check valve is structured to be movably guided in the valve guide. In order to solve it, it has the following structures.

That is, in claim 1, the other end side of the valve guide is closed.

According to a second aspect of the present invention, the other end side of the valve guide is closed, and the other end side is provided with an opening having a small diameter.

According to a third aspect of the present invention, the other end of the valve guide is closed, and the side surface of the valve guide is provided with an opening having a small diameter.

According to a fourth aspect of the present invention, the valve guide is closed on the other end side and has a slit-shaped opening on its side surface.

According to a fifth aspect of the present invention, the valve guide is closed at the other end side, while the valve rod is formed with a through hole that is continuous from one end side to the side surface.

According to a sixth aspect of the present invention, the other end of the valve guide is closed, while the valve rod is formed with a slit from one end to a side surface.

[0017]

According to the first aspect of the present invention, since the valve guide is cylindrical with the other end side closed, when the valve seat operates in the direction of colliding with one end side of the valve guide, the other valve guide Since it is necessary to push the fluid in the space between the inner surface of the end side and the other end side of the valve rod from the inside of the valve guide to the outside,
This serves as a damper effect, and the valve seat cannot move abruptly toward the one end side of the valve guide, and therefore does not collide with the valve guide.

In the second aspect, since the small-diameter opening is provided on the other end side of the valve guide, the fluid in the space can gradually flow out from the small-diameter opening to the outside similarly to the above. As a result, the valve seat does not collide with the one end side of the valve guide, and the other end side of the valve guide is not closed as in the first aspect. Smoother than if.

In the third aspect, since the valve guide is closed at the other end side, the valve seat does not collide with the valve guide as in the first aspect, and the side surface of the valve guide has a small diameter opening. Is provided, the fluid flows out through the opening, resulting in smooth operation of the valve body.

According to the present invention, since the other end of the valve guide is closed, the valve seat does not collide with the valve guide as in the first embodiment, and the slit-shaped opening is formed on the side surface. Is provided, the fluid flows out through the opening, resulting in smooth operation of the valve body.

In the present invention, since the valve guide is closed at the other end side, the valve seat does not collide with the valve guide as in the case of the first aspect, and the valve rod has one end. Since the through hole that is continuous from the side to the side surface is formed, the fluid flows out through the through hole, and as a result, the valve body operates smoothly.

In the sixth aspect, since the other end side of the valve guide is closed, the valve seat does not collide with the valve guide as in the first aspect, and the valve rod has one end. Since the slit is formed from the side to the side surface, the fluid flows out through the slit, and as a result,
The operation of the valve body becomes smooth.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

Embodiment 1 FIG. 1 is a cross-sectional view of a check valve according to Embodiment 1 of the present invention attached to a casing, and FIG.
The same reference numerals are given to the parts and components similar to or corresponding to, and detailed description of the parts and components having the same reference signs will be omitted.

In the check valve 26 of the first embodiment, the valve guide 8 has a cylindrical shape in which the lower end side (one end side) is open, but the upper end side (other end side) is closed. ing.

According to such a structure of the valve guide 8, the pressure in the chamber A of the casing 2 becomes higher than the pressure in the chamber B, and the fluid tends to flow in the direction of the arrow, and the fluid pressure causes the valve body 10 to move. When the valve seat 22 is pushed in that direction and operates in a direction in which the valve seat 22 collides with the edge of the lower end side opening 18 of the valve guide 8, the valve rod 20 moves in the same direction in the valve guide 8. I try to move,
Since there is fluid in the space between the inner surface of the upper end of the valve guide 8 and the upper end of the valve rod 20, the valve rod 20 moves inward of the valve guide unless the fluid in the space is released to the outside. It will not be possible.

Therefore, the valve rod 20 allows the fluid in the space thereof to move in accordance with the movement of the valve seat 22 through the narrow gap between the inner peripheral surface of the valve guide 8 and the outer peripheral surface of the valve rod 20. The valve seat 22 moves while being gradually pushed outward from the lower end side opening 18, so that the valve seat 22 is suddenly acted as a damper by the fluid pushed out from the inside of the valve guide 8 to rapidly open the lower end side opening 18 of the valve guide 8. It becomes impossible to move so as to suddenly collide with the edge portion of the valve guide, and the sudden collision with the valve guide 8 is prevented.

As a result, the valve body 10 will not suddenly collide with the valve guide 8 and be damaged, or the components of the check valve such as the valve guide 8 will not be damaged by the sudden collision. The operational reliability of is greatly improved.

Embodiment 2 FIG. 2 is a cross-sectional view of a check valve according to Embodiment 2 of the present invention attached to a casing, and FIG.
The same reference numerals are given to the parts and components similar to or corresponding to, and detailed description of the parts and components having the same reference signs will be omitted.

In the check valve 28 of the second embodiment, the upper end side of the valve guide 8 is closed, and a small diameter opening 30 is provided on the upper end side.

According to this structure, when the valve seat 22 tries to move toward the lower end side opening 18 of the valve guide 8 when the chamber A internal pressure is higher than the chamber B internal pressure, the fluid in the space is Is to be gradually pushed outward from the lower end side opening 18 of the valve guide 8 through a narrow gap between the inner peripheral surface of the valve guide 8 and the outer peripheral surface of the valve rod 20 in the same manner as in the first embodiment. Eventually, the valve seat 22 cannot move so as to suddenly collide with the edge of the lower end side opening 18 of the valve guide 8 due to the damper action of the fluid pushed out from the inside of the valve guide 8, so that There will be no sudden collision.

In addition, in the second embodiment, in addition to that, since the small-diameter opening 30 is provided on the upper end side of the valve guide 8, a part of the fluid can escape from the opening 30 to the outside. Compared with Example 1, the operation of the valve body 10 until just before the valve seat 22 collides with the valve guide 8 becomes smoother.

Third Embodiment FIG. 3 is a cross-sectional view of a check valve according to a third embodiment of the present invention attached to a casing, and FIG.
The same reference numerals are given to the parts and components similar to or corresponding to, and detailed description of the parts and components having the same reference signs will be omitted.

In the check valve 32 of the third embodiment, the upper end side of the valve guide 8 is closed, and the valve seat 2 is provided on the side surface thereof.
A small diameter opening 34 is provided at a position such that the fluid in the space can escape from there until just before 2 collides with the edge of the lower end side opening 18 of the valve guide 8, and when it collides. ing.

According to this structure, since the upper end side of the valve guide 8 is closed, the valve seat 22 suddenly collides with the valve guide 8 due to the damper action of the fluid in the space as in the above embodiment. However, at the same time, the fluid in the space can flow out through the small-diameter opening 34 on the side surface of the valve seat 22 until just before the valve seat 22 collides with the valve guide 8. Therefore, the movement of the valve body 10 is smooth. become.

Fourth Embodiment FIG. 4 is a cross-sectional view of a check valve according to a fourth embodiment of the present invention mounted on a casing, and FIG.
The same reference numerals are given to the parts and components similar to or corresponding to, and detailed description of the parts and components having the same reference signs will be omitted.

In the check valve 36 of the fourth embodiment, the upper end side of the valve guide 8 is closed, and the side surface of the check valve 36 is until just before the valve seat 22 collides with the edge of the lower end side opening 18 of the valve guide 8. A slit-shaped opening 38 is provided at a position where the fluid in the space is released and is closed when a collision occurs.

According to this structure, since the upper end side of the valve guide 8 is closed, the valve seat 22 does not suddenly collide with the valve guide 8 as in the above embodiment, and
Until just before the collision, the fluid in the space can escape to the outside from the slit-shaped opening 38 on the side surface, so that the operation of the valve body 10 becomes smooth.

Embodiment 5 FIG. 5 is a cross-sectional view of a check valve according to Embodiment 5 of the present invention attached to a casing, and FIG.
The same reference numerals are given to the parts and components similar to or corresponding to, and detailed description of the parts and components having the same reference signs will be omitted.

In the check valve 40 of the fifth embodiment, the upper end side of the valve guide 8 is closed, and the fluid in the space extends from the upper end side to the side surface of the valve rod 20 and the valve seat 22 serves as the valve guide 8. A through hole 42 is formed at a position where the fluid is allowed to escape to the outside just before the collision with the edge of the lower end side opening 18 and is closed at the time of the collision.

According to this structure, since the upper end side of the valve guide 8 is closed, the valve seat 22 does not suddenly collide with the valve guide 8 as in the case of the above-mentioned embodiment. The fluid in the space escapes from the through hole 42 to the outside immediately before the collision due to the through hole 42 that is conducted from the upper end side to the side surface of the valve rod 20, so that the operation of the valve body 10 becomes smooth.

Embodiment 6 FIG. 6 is a cross-sectional view of a check valve according to Embodiment 6 of the present invention mounted on a casing, and FIG.
The same reference numerals are given to the parts and components similar to or corresponding to, and detailed description of the parts and components having the same reference signs will be omitted.

In the check valve 44 of the sixth embodiment, the upper end side of the valve guide 8 is closed, and the valve seat 22 collides with the edge of the lower end side opening 18 of the valve guide 8 on the side surface of the valve rod 20. A slit 46 is provided at a position so as to allow the fluid in the space to escape to the outside until just before and to close it in the event of a collision.

According to this structure, since the upper end side of the valve guide 8 is closed, the valve seat 22 does not suddenly collide with the valve guide 8 as in the case of the above-mentioned embodiment. The fluid in the space can flow out through the slit 46 extending from the upper end side to the side surface of the rod 20 until just before the collision, so that the valve body 10 operates smoothly.

[0045]

As described above, according to the first aspect of the present invention, since the valve guide has the tubular shape with the other end side closed, when the valve seat operates in the direction of moving to the one end side of the valve guide. , The action of pushing the fluid in the space between the inner surface of the other end of the valve guide and the other end of the valve rod from the inside of the valve guide to the outside serves as a damper effect, causing the valve seat to move rapidly toward one end of the valve guide. The fluid can be smoothly shut off without operating.

In the second aspect, since the valve guide has a structure in which the small-diameter opening is provided on the other end side, the fluid in the space acts as a damper similarly to the above, and as a result, the valve seat serves as the valve guide. Since the fluid does not suddenly collide with the one end side and the fluid can flow out through the small-diameter opening, the operation of the valve body becomes smoother than in the case of claim 1.

In the third aspect, since the valve guide is closed at the other end side, the valve seat does not suddenly collide with the valve guide as in the above, and the side surface of the valve guide has a small diameter opening. Is provided, the fluid flows out through the opening, resulting in smooth operation of the valve body.

According to the present invention, since the other end of the valve guide is closed, the valve seat does not abruptly collide with the valve guide and the slit-shaped opening is formed on the side surface. Is provided, the fluid flows out through the opening, resulting in smooth operation of the valve body.

According to the present invention, since the other end of the valve guide is closed, the valve seat does not abruptly collide with the valve guide, and the valve rod has one end. Since a through-hole that is continuous from the side to the side is formed, the fluid flows out through the through-hole,
As a result, the valve body operates smoothly.

In the sixth aspect, since the other end side of the valve guide is closed, the valve seat does not suddenly collide with the valve guide as in the above, and the valve rod has one end. Since the slit is formed from the side to the side surface, the fluid flows out from the slit to the outside, and as a result, the valve body operates smoothly.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a check valve according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a check valve according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a check valve according to a third embodiment of the present invention.

FIG. 4 is a sectional view of a check valve according to a fourth embodiment of the present invention.

FIG. 5 is a sectional view of a check valve according to a fifth embodiment of the present invention.

FIG. 6 is a sectional view of a check valve according to a sixth embodiment of the present invention.

FIG. 7 is a cross-sectional view of a check valve according to a conventional example.

[Explanation of symbols]

 2 casing 6 valve support, 8 valve guide 10 valve body 18 lower end side opening of valve guide 20 valve rod 22 valve seat

Claims (6)

[Claims] 1. A valve body and a valve guide, wherein the valve body has a valve seat fixed to one end side of a valve rod, and the valve guide has a cylindrical shape and one end thereof. The other end of the valve rod is inserted from the side opening, and the inserted valve rod is a check valve structured to be movably guided in the valve guide, and the valve guide is closed at the other end. A check valve characterized in that 2. A valve body and a valve guide, the valve body having a valve seat fixed to one end side of a valve rod, the valve guide having a cylindrical shape, and one end thereof. The other end of the valve rod is inserted from the side opening, and the inserted valve rod is a check valve structured to be movably guided in the valve guide, and the valve guide is closed at the other end. With
A check valve having a small-diameter opening on the other end side. 3. A valve body and a valve guide, the valve body having a valve seat fixed to one end side of a valve rod, the valve guide having a cylindrical shape, and one end thereof. The other end of the valve rod is inserted from the side opening, and the inserted valve rod is a check valve structured to be movably guided in the valve guide, and the valve guide is closed at the other end. With
And a check valve characterized in that a small-diameter opening is provided on the side surface thereof. 4. A valve body and a valve guide, wherein the valve body has a valve seat fixed to one end side of a valve rod, and the valve guide has a cylindrical shape and one end thereof. The other end side of the valve rod is inserted from the side opening, and the inserted valve rod is a check valve that is movably guided in the valve guide, and the valve guide is closed at the other end side. A check valve characterized by being provided with a slit-shaped opening on its side surface. 5. A valve body and a valve guide, the valve body having a valve seat fixed to one end side of a valve rod, the valve guide having a cylindrical shape, and one end thereof. The other end side of the valve rod is inserted from the side opening, and the inserted valve rod is a check valve that is movably guided in the valve guide, and the valve guide is closed at the other end side. On the other hand, the check valve is characterized in that the valve rod is formed with a through hole that is continuous from one end side to a side surface. 6. A valve body and a valve guide, wherein the valve body has a valve seat fixed to one end side of a valve rod, and the valve guide has a cylindrical shape and one end thereof. The other end side of the valve rod is inserted from the side opening, and the inserted valve rod is a check valve configured to be movably guided in the valve guide, and the valve guide has the other end side closed. On the other hand, the check valve is characterized in that the valve rod has a slit formed from one end side to a side surface.