JPH10299942A - Angle type check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an angle type check valve, the operation of the valve element of which is hard to be subject to the pressure pulsation of primary side fluid. SOLUTION: An angle type check valve is provided with an inlet port 3 and an outlet port 5, flow passages 4 and 6 to connect the inlet port 3 and an outlet port 5 which are provided in curved shape, a valve element 8 to close the flow passage 4 on the inlet port 3 side being established in curved section of the flow passages 4 and 6, a spring 15 to force this valve element 8 in the closing direction, and a connecting route 17 to connect the spring action part of the valve element 8 and the flow passage 6 in the outlet port 5 side. In this check valve, a flow control valve 21 which can change the controlled flow rate is established intervening the communicating routes 16 and 17 to be capable of controlling the flow rate in the communicating route 17. The flow rate in the communicating route 17 is restricted by the flow rate control valve 21 to delay the response time of the check valve and to prevent chattering caused by pressure pulsation of primary side fluid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
More particularly, the present invention relates to an angle type check valve in which a flow path connecting an inlet port and an outlet port is provided in a bent shape.

[0002]

2. Description of the Related Art Conventionally, for example, in the field of hydraulic pressure, for the purpose of preventing the backflow of hydraulic oil in a hydraulic circuit and ensuring the movement of an actuator, the flow direction of hydraulic oil is limited to one direction. Check valve is used. Some of the check valves are of an angle type in which a flow path communicating an inlet port and an outlet port is provided in a bent shape.

Hereinafter, this conventional angle type check valve will be described in more detail with reference to FIG.

As shown in FIG. 1, the check valve 101 includes a valve body 102, a lid 103, a valve 107, a spring 108, and an O-ring 113. The valve body 102 has an inlet port 104 at the lower end,
An outlet port 105 is provided at the right end, and a primary channel 110 connected to the inlet port 104 and a secondary channel 111 connected to the outlet port 105 are provided so as to intersect in a substantially T-shape. The flow channels 110 and 111 are formed in a bent state as a whole. Note that a tapered sheet portion 115 is provided in the primary flow path 110 at the intersection of the primary flow path 110 and the secondary flow path 111.

The valve main body 102 has a guide hole 106 coaxial with the primary side flow passage 110 extending from the primary side flow passage 110, and the valve body 107 is inserted into the guide hole 106 so that the valve body 107 is inserted. 107 is slidable in the vertical direction.

The valve body 107 has a spring receiving hole 109 which is open at the top.
09 accommodates the spring 108. The lower end 114 of the valve body 107 is formed in a tapered shape, and the lower end 114 is
The primary side channel 110 is closed by sitting on the primary side channel. The valve body 107 is provided with a communication passage 112 that communicates the spring receiving hole 109 with the secondary flow passage 111.
The internal fluid can flow into the spring receiving hole 109.

The lid 103 closes the upper end of the valve body 102, and an O-ring 113 seals between them. In addition, a relief hole 116 is provided on the lower surface of the lid 103, and the upper end of the spring 108 is locked by the end surface of the relief hole 116. Further, the upward stroke of the valve element 107 is secured by the escape hole 116.

According to the check valve 101 having the above structure, the valve body 107 is urged downward by the pressure of the secondary fluid flowing into the spring receiving hole 109 through the communication passage 112 and the spring 108. While the tip 11
4 receives the pressure of the primary fluid, and the valve body 107 is urged upward.

When the urging force of the primary fluid is stronger than the urging force of the secondary fluid and the spring 108, the valve element 107 is pushed upward to cause the primary flow path 1 to move upward.
10 communicates with the secondary flow path 111, the primary fluid flows into the secondary flow path 111, and the flow of the fluid from the inlet port 104 to the outlet port 105 is secured. Conversely, 1
The urging force of the secondary fluid is applied to the secondary fluid and the spring 10
8 is weaker than the urging force of the secondary fluid 8, the valve body 107 is pushed down, and the front end portion 114 of the valve body 107 is seated on the seat portion 115 to close the primary flow path 110. Inflow into the flow channel 110 is prevented.

As described above, the angle type check valve 1
In the case 01, the flow in only one direction from the inlet port 104 to the outlet port 105 is ensured by the difference between the urging force of the primary fluid and the urging force of the secondary fluid and the spring 108.

[0011]

In a positive displacement pump such as a piston pump, it is generally known that the pressure of the fluid discharged from the pump pulsates due to flow pulsation caused by a mechanism or the like. I have.

Conventionally, when the above-mentioned angle type check valve 101 is used for controlling such a fluid accompanied by pressure pulsation, the following problem occurs.

That is, as described above, the conventional angle type check valve 101 controls the flow of the fluid by the biasing force difference between the primary fluid, the secondary fluid, and the spring 108. The pressure of the side fluid pulsates and the urging force of the primary fluid against the valve body 107 pulsates, and the urging force of the primary fluid with respect to the urging force of the secondary fluid and the spring 108 increases or decreases alternately. When the fluctuation occurs, the valve body 107 moves up and down with this, so-called chattering phenomenon occurs in which the contact / separation between the lower end portion 114 of the valve body 107 and the seat portion 115 is repeated, and the lower end portion 114 of the valve body 107 is generated. In addition, there is a problem that the seat portion 115 is damaged and the closeability of the seat portion is deteriorated, or intense noise is generated.

It is conceivable to solve such a pressure pulsation of the primary fluid by using an accumulator, but in this case, there is a problem that an extra space for installing the accumulator must be secured. There is also a problem that the cost of the device related to the fluid control is increased, which is not preferable in terms of device design.

The present invention has been made in view of the above circumstances, and has as its object to provide an angle check valve whose operation is hardly affected by the pressure pulsation of the primary fluid.

[0016]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an inlet port and an outlet port, a flow path provided in a bent shape and communicating the inlet port and the outlet port, A valve body provided at the bent portion of the valve body to close the flow path on the inlet port side, a spring for urging the valve body in the closing direction, and a spring action portion of the valve body and the flow path on the outlet port side. An angle-type check valve having a communication passage communicating with the communication passage, wherein a flow control valve capable of changing a control flow rate is provided interposed in the communication passage so that a flow rate in the communication passage can be controlled. It is provided as a configuration.

According to the present invention having the above configuration, the valve provided at the bent portion of the flow path receives the pressure of the fluid in the inlet port side flow path to release the closing of the flow path. It is urged to. On the other hand, this valve body is urged by a spring in a direction to close the flow path on the inlet port side, and is also affected by the pressure of the fluid in the outlet port side flow path supplied to the spring acting portion through the communication path. It is urged in a direction to close the flow path on the inlet port side.

Therefore, when the urging force of the fluid at the inlet port side is stronger than the urging force of the fluid and the spring at the outlet port side, the valve body is moved in the direction to release the closing of the flow path, and And the flow path on the outlet port side communicates with each other, so that the fluid on the inlet port side flows into the flow path on the outlet port side, and the flow of fluid from the inlet port to the outlet port is ensured. Conversely, when the urging force of the fluid at the inlet port side is weaker than the urging force of the fluid and the spring at the outlet port side, the valve element is moved in the closing direction to close the flow path at the inlet port side, and the outlet is closed. The fluid on the port side is prevented from flowing into the flow path on the inlet port side. Thus, flow in only one direction from the inlet port to the outlet port is ensured.

As described above, since the fluid in the outlet port side flow path is supplied to the spring action portion via the communication passage, the movement of the valve body in the closing direction or the release direction flows through the communication passage. This is done following the fluid. On the other hand, the flow rate in the communication passage can be adjusted by the flow control valve, and by appropriately adjusting the flow rate in the communication passage by the flow control valve, the moving speed of the valve body that moves following the flow can be appropriately adjusted. can do. That is, the response time of the valve element can be appropriately set.

Therefore, when the fluid on the inlet port side is a so-called pulsating fluid whose pressure fluctuates at a predetermined frequency, the flow rate in the communication passage is adjusted by the flow rate control valve.
By setting the response time of the valve body to be later than the time of pressure fluctuation, chattering of the valve body can be prevented. That is, if the fluid pressure on the inlet port side is reduced and the time required for the valve body to close the flow path on the inlet port side is made slower than the time of the pressure fluctuation, the valve body becomes the flow path on the inlet port side. Before the valve is closed, the fluid pressure on the inlet port side increases, whereby the valve element is urged in the release direction and starts moving in the same direction, thereby preventing chattering.

[0021] Thus, it is possible to solve the conventional problems caused by the chattering, such that the closing part on the valve body and the inlet port side is damaged and the closing performance of the part is deteriorated, or a strong noise is generated. You can.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an angle type check valve according to a specific embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing an angle type check valve according to the present embodiment, and FIG. 2 is a cross-sectional view of the angle-type check valve in the direction of arrows XX.

As shown in FIG. 1, the check valve 1 comprises a housing-shaped valve body 2, a valve body 8, a seat ring 11, a spring receiving plug 14 and a spring 1 provided on the valve body 2.
5 and a flow control valve 21 provided on the upper surface of the valve main body 2.

The valve body 2 is provided with an inlet port 3 and an outlet port 5 on the lower surface, and the lower surface is connected to an appropriate structure (not shown) such as a hydraulic unit.
Is attached and the joint is sealed by an O-ring 19. Further, the valve body 2 includes a primary flow path 4 and a secondary flow path 6 that communicate the inlet port 3 and the outlet port 5, and the primary flow path 4 is directed upward from the inlet port 3. The secondary flow path 6 is formed by a vertical flow path, the flow path provided horizontally from the right end of the valve body 2 and one end communicates with this horizontal flow path, and the other end is connected to the outlet port 5. It is formed by vertical channels that communicate with each other. And the secondary side flow path 6
The right end of the horizontal flow passage is sealed by a sealing plug 7, and the left end thereof intersects with the primary flow passage 4 at a substantially right angle and communicates therewith. The flow path formed by the flow path 4 and the secondary flow path 6 is formed in a U-shape as a whole.

The seat ring 11 is provided by being press-fitted into the primary flow path 4 at the intersection with the secondary flow path 6 and has a tapered seat portion 12 at the upper end of the inner surface. ing.

The valve body 8 has a spring receiving hole 10 which is open at the top, and a lower end 9 of the valve body 8 is formed in a tapered shape.
Is inserted into a guide hole 13 provided coaxially with the extension of the guide hole 13 so as to be slidable in the vertical direction. When the valve body 8 moves downward and the lower end portion 9 of the valve body 8 is seated on the seat portion 12 of the seat ring 11, the primary flow path 4 is closed.

The spring receiving plug 14 has an O-ring 20 at its neck, and is screwed to the upper end of the valve body 2 to seal the guide hole 13. The spring receiving plug 14 has a spring receiving hole 14a opened on the lower surface. One of the springs 15 is inserted into the spring receiving hole 14a, and the other is inserted into the spring receiving hole 10 of the valve body 8. In this state, the spring 15 is provided. The spring 15 urges the valve body 8 downward.

As shown in FIGS. 1 and 2, the flow control valve 21 includes a flow control valve body 22 and a needle valve 2.
4 and a handle 23 for driving the needle valve 24.

As shown in FIG. 2, the flow control valve body 2
2 has a first port 25 and a second port 26 on the lower surface thereof.
A flow path that communicates with the second port 26 is formed.
As shown, this flow path is provided so as to open on both sides of the flow control valve body 22, and the opening is sealed by a sealing plug. The first port 25 and the second port 26 are sealed by O-rings 30, respectively.

The needle valve 24 is inserted into a guide hole 29 and is provided so as to move vertically by rotating the handle 23. The lower end of the needle valve 24 is formed in a tapered shape. The opening area of the control orifice 27 is controlled by moving up and down.

As shown by a broken line in FIG. 1, the valve main body 2 has a horizontal flow path having one end opened at the right end of the valve main body 2 and the other end communicating with the guide hole 13. ,
A second communication path 17 having one end communicating with the horizontal flow path and the other end communicating with a vertical flow path communicating with the second port 26 of the flow control valve 21; A first communication path 16 is provided, which communicates with the secondary flow path 6 and the other end of which communicates with the second port 26 of the flow control valve 21. The first communication path 16 is provided between the guide hole 13 and the secondary flow path 6. Is communicated through the first communication path 16, the second communication path 17, and the flow control valve 21. The second communication passage 17 that opens at the right end of the valve body 2 is sealed by a sealing plug 18.

According to the check valve 1 according to the present embodiment having the above configuration, the valve element 8 is urged upward by receiving the pressure of the primary fluid in the primary flow path 4. , The biasing force of the spring 15, the first communication passage 16, the flow control valve 21, the second
It is urged downward by receiving both the pressure of the secondary fluid in the secondary flow path 6 that flows into the guide hole 13 through the communication passage 17 in sequence.

When the urging force of the primary fluid is stronger than the urging force of the secondary fluid and the spring 15, the valve 8 is pushed upward and the primary flow path 4 and the secondary flow And the primary fluid flows from the primary channel 4 to the
Inflow into the secondary flow path 6 and the inlet port 3 to the outlet port 5
The flow of the fluid toward is secured. Conversely, if the urging force of the primary fluid is weaker than the urging force of the secondary fluid and the spring 15, the valve body 8 is pushed down,
The distal end portion 9 is seated on the seat portion 12 to close the primary flow path 4, thereby preventing the secondary fluid from flowing into the primary flow path 4. Thus, a flow in only one direction from the inlet port 3 to the outlet port 5 is ensured.

In the check valve 1, due to the structure described above, the valve element 8 moves upward following the amount of fluid discharged from the guide hole 13 and is supplied to the guide hole 13. Move downward following the inflow of fluid. On the other hand, since the guide hole 13 and the secondary flow path 6 communicate with each other through the flow control valve 21, the amount of fluid discharged from the guide hole 13 and the amount of fluid flowing into the guide hole 13 are determined by the flow rate It is controlled by the control valve 21.

Therefore, by adjusting the flow control valve 21, the speed at which the valve body 8 moves up and down, that is, the check valve 1
Can be freely controlled, and when the pressure of the primary fluid pulsates and the urging force acting on the valve element 8 of the primary fluid pulsates, the response time can be reduced by delaying the response time. Thus, chattering of the check valve 1 due to the pulsation can be prevented.

When the valve element 8 moves upward and the check valve 1 is opened, the pressure of the primary fluid decreases due to the pulsation, and the urging force of the primary fluid reduces the secondary fluid and the spring 15. When the force becomes weaker than the urging force of the valve, the valve body 8 moves downward following the inflow amount of the fluid supplied to the guide hole 13 as described above, but the flow control valve is controlled so as to suppress this inflow amount. 21 is adjusted appropriately to reduce the speed at which the valve body 8 moves downward, so that the pressure of the primary fluid increases before the lower end 9 of the valve body 8 contacts the seat portion 12 and closes it. Set to. As a result, the valve element 8 is moved upward again by the high-pressure primary fluid before the lower end 9 contacts the seat portion 12. When the fluid pressure fluctuates at a predetermined frequency as described above, the above-described chattering is performed by adjusting the flow control valve 21 so that the response time of the check valve 1 is set to be later than the fluctuation time. It can be prevented.

As a result, it is possible to solve the conventional problems caused by the chattering, such as damage to the lower end portion 9 and the seat portion 12 of the valve body 8 to deteriorate the closing property of the portion or to generate a loud noise. Can be.

Since the check valve 1 uses a variable flow control valve 21 capable of changing the control flow rate,
It is possible to easily cope with a case where the frequency of the pulsation fluctuates.

Although the angle type check valve according to one embodiment of the present invention has been described above, it is needless to say that the specific aspect of the present invention is not limited to this. As the control valve 21, a variable flow control valve or the like can be used in addition to the needle type throttle valve described above.

If fluid leakage between the secondary passage 6 and the guide hole 13 in the sliding portion between the valve element 8 and the guide hole 13 is large, the sliding portion is connected to an O-ring. It may be configured so as to be sealed by, for example.

[0041]

As described in detail above, according to the present invention,
Since the flow rate control valve is configured such that the flow rate in the communication passage can be appropriately adjusted, the response time of the valve body that moves following the flow of the fluid in the communication passage can be appropriately set,
Even if the fluid on the inlet port side is a so-called pulsating fluid whose pressure fluctuates at a predetermined frequency, the flow rate in the communication passage is adjusted by the flow control valve, and the response time of the valve body is made slower than the time of pressure fluctuation. By setting so that it becomes possible, chattering of the valve body can be prevented.

Therefore, there is no problem that the closing portion on the valve body and the inlet port side is damaged due to the chattering, and the closing performance of the closing portion is deteriorated, or intense noise is generated.

Further, the check valve according to the present invention has the advantages that its configuration is compact and inexpensive, and that it is advantageous in terms of cost and installation space as compared with other chattering prevention methods.

[Brief description of the drawings]

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

FIG. 2 is a sectional view in the direction of arrows XX in FIG.

FIG. 3 is a sectional view showing a conventional angle type check valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Check valve 2 Valve main body 3 Inlet port 4 Primary flow path 5 Outlet port 6 Secondary flow path 8 Valve 9 Lower end part 11 Seat ring 15 Spring 16 First communication path 17 Second communication path 20 Flow control valve

Claims (1)

[Claims] An inlet port and an outlet port are provided in a bent shape to communicate between the inlet port and the outlet port, and provided at a bent portion of the flow path. A valve body 8 for closing the flow path 4 on the inlet port 3 side, a spring 15 for urging the valve body 8 in the closing direction, a spring action portion of the valve body 8 and a flow path on the outlet port 5 side 6
Angle type check valve having communication passages 16 and 17 for communicating with the flow passage, the flow control valve 21 capable of changing the control flow rate is connected to the communication passage 1
An angle type non-return valve, which is provided interposed between the first and second communication passages and the second communication passage so that the flow rate in the communication passages can be controlled.