CN210397824U

CN210397824U - Check valve and hydraulic system

Info

Publication number: CN210397824U
Application number: CN201921177044.6U
Authority: CN
Inventors: 刘树红; 李博; 左志钢
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2019-07-24
Filing date: 2019-07-24
Publication date: 2020-04-24
Anticipated expiration: 2029-07-24

Abstract

An embodiment of the utility model provides a check valve and hydraulic system, the check valve includes: the valve body is provided with an inlet and an outlet, the resetting piece is arranged in the valve body and used for keeping the valve core at a position for blocking the inlet and the outlet, and when fluid flows from the inlet to the outlet, the valve core can move under the pushing action of the fluid to conduct the inlet and the outlet. The one-way valve can effectively reduce cavitation damage, has long service life and reduces cost. The hydraulic system comprises the check valve, and has all the advantages of the check valve.

Description

Check valve and hydraulic system

Technical Field

The utility model relates to a valve field particularly, relates to a check valve and hydraulic system.

Background

With the progress of modern technology, fluid systems are widely applied to hydraulic, pneumatic, hydraulic and the like systems. Valves are key elements in the operation of fluid systems, while check valves are commonly used fluid control valves that allow fluid to enter only from an inlet and exit only from an outlet, and remain latched when fluid flows into the check valve from the outlet. With the progress of hydraulic fluid technology, the cavitation problem in the check valve is more serious day by day, and the components in the check valve are easy to vibrate, squeal, cavitate and the like. Cavitation damage within the check valve can reduce or even render the hydraulic system ineffective, increasing cost.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a check valve and hydraulic system, for example, it can effectively reduce cavitation erosion and destroy, extension check valve life, reduce cost.

The embodiment of the utility model discloses a can realize like this:

in a first aspect, an embodiment of the present invention provides a check valve, the check valve includes:

the valve body is provided with an inlet and an outlet, the resetting piece is arranged in the valve body and used for keeping the valve core at a position for blocking the inlet and the outlet, and when fluid flows from the inlet to the outlet, the valve core can move under the pushing action of the fluid to conduct the inlet and the outlet.

In alternative embodiments, the reduction member is made of rubber, nylon, high pressure polyethylene, polypropylene, ABS plastic, fiberglass, or architectural membrane material.

In an optional embodiment, the reset piece is annular, the reset piece is sleeved outside the valve core, the peripheral wall of the reset piece is in sealing connection with the valve body, the elastic surface is located on one side, facing the inlet, of the reset piece, and the reset piece is used for enabling the valve core to block the inlet; the valve core is provided with a flow channel, when fluid flows from the inlet to the outlet, the valve core can move under the pushing action of the fluid to expose the inlet, and then the fluid flowing in from the inlet flows out from the outlet after flowing through the flow channel.

In an alternative embodiment, the flow channel comprises a first flow section and a second flow section which are communicated, and one end of the first flow section, which is far away from the second flow section, extends to the outer peripheral surface of the valve core; one end of the second flow-through section, which is far away from the first flow-through section, extends to the end face of the valve core, which is far away from the inlet.

In an alternative embodiment, the number of the first flow-through sections is provided in plurality, and each of the plurality of first flow-through sections is communicated with the second flow-through section.

In an alternative embodiment, the valve core has a sealing surface, and the reset piece is connected with the valve core and the valve body at the same time and used for enabling the sealing surface to block the inlet.

In an alternative embodiment, the sealing surface comprises at least one chamfer.

In an alternative embodiment, the sealing surface is provided as a conical surface.

In an alternative embodiment, the modulus of elasticity of the restoring member is less than 1 GPa.

In a second aspect, an embodiment of the present invention provides a hydraulic system, which includes:

a one-way valve as in any one of the preceding embodiments.

The utility model discloses beneficial effect includes, for example:

in summary, the present embodiment provides a check valve, the valve core is connected to the valve body through a reset element having an elastic surface, the reset element keeps the valve core at a position blocking the inlet and the outlet all the time, and the valve core is matched with the valve body, so that the fluid can only flow from the inlet to the outlet, but cannot flow from the outlet to the inlet, that is, the one-way conduction from the inlet to the outlet is realized. When fluid flows in from the inlet, the valve core moves relative to the valve body under the pushing action of the fluid, the valve core leaves the positions for plugging the inlet and the outlet, the fluid at the inlet can flow to the outlet after passing through the inlet, the typical cavitation behavior comprises expansion and collapse when the fluid generates cavitation in the one-way valve, and the collapse jet flows away from the elastic surface of the reset piece when the cavitation collapse position is located on the elastic surface of the reset piece, so that the damage of the collapse jet to the reset piece is effectively prevented. Meanwhile, when fluid enters the push valve core from the inlet to move, the reset piece moves together with the valve core to deform, and the reset piece stores force for restoring deformation. When the flow of the fluid entering from the inlet is reduced or zero, the force of the fluid acting on the valve core is reduced or disappears, and the valve core is driven to move to the position blocking the inlet and the outlet under the action of the resetting piece, so that the inlet and the outlet are blocked.

The present embodiment also provides a hydraulic system comprising the above mentioned check valve, with all the advantages of the above mentioned check valve.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a check valve provided in this embodiment;

fig. 2 is a schematic structural diagram of a deformed structure of the check valve provided in this embodiment;

fig. 3 is a schematic structural diagram of the valve element provided in this embodiment.

Icon:

001-one-way valve; 100-a valve body; 110-an inlet; 120-an outlet; 130-a connection end; 140-a through hole; 200-a valve core; 210-a blocking part; 211-sealing surface; 220-a connecting portion; 230-a flow channel; 231-a first flow-through section; 232-a second flow-through section; 300-reset piece.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the products of the present invention are used, the description is only for convenience of description and simplification, but the indication or suggestion that the indicated device or element must have a specific position, be constructed and operated in a specific orientation, and thus, should not be interpreted as a limitation of the present invention.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

Referring to fig. 1 and fig. 2, the present embodiment provides a check valve 001, which is suitable for a hydraulic system to realize one-way conduction of fluid. It will be appreciated that the one-way valve 001 may also be adapted for use in other flow systems, not to mention them. The one-way valve 001 can effectively reduce cavitation damage in the using process, the service life of the one-way valve 001 is prolonged, the maintenance cost is reduced, and the use cost is reduced.

In this embodiment, the check valve 001 includes a valve body 100, a valve core 200, and a reset piece 300 having an elastic surface, the valve body 100 has an inlet 110 and an outlet 120, the reset piece 300 is disposed in the valve body 100 and is used for keeping the valve core 200 at a position blocking the inlet 110 and the outlet 120, and when a fluid flows from the inlet 110 to the outlet 120, the valve core 200 can move under the pushing action of the fluid to conduct the inlet 110 and the outlet 120. In other words, the fluid can only flow in the direction from the inlet 110 to the outlet 120, and when the fluid flows from the outlet 120 to the inlet 110, the fluid does not push the valve cartridge 200 to move relative to the valve body 100, and the inlet 110 and the outlet 120 are not connected.

In the use process of the check valve 001 provided by the present embodiment, after the fluid flows in from the inlet 110, the valve element 200 moves relative to the valve body 100 under the pushing action of the fluid, the valve element 200 leaves the position for blocking the inlet 110 and the outlet 120, so that the fluid at the inlet 110 can flow through the inlet 110 and towards the outlet 120, when the fluid generates cavitation in the check valve 001, the typical cavitation behavior includes expansion and collapse, and when the position for cavitation collapse is located on the elastic surface of the reset piece 300, the collapse jet deviates from the elastic surface of the reset piece 300, thereby effectively preventing the collapse jet from damaging the reset piece 300. Meanwhile, when the fluid moves by entering the push valve member 200 from the inlet 110, the restoring member 300 is deformed as the valve member 200 moves together, and the restoring member 300 stores a force for restoring the deformation. When the flow rate of the fluid entering from the inlet 110 is reduced or zero, the force of the fluid acting on the valve element 200 is reduced or eliminated, and the valve element 200 is driven to move to a position blocking the inlet 110 and the outlet 120 under the action of the reset piece 300, so that the inlet 110 and the outlet 120 are blocked.

It should be noted that, the existing valve core 200 and the valve body 100 are connected by a spring assembly, the surface of the spring is a rigid surface, when the cavitation collapse position is located near the rigid surface, the collapse jet flows towards the rigid surface, the velocity of the collapse jet flow can reach over 100m/s, and further cavitation erosion is caused, so that the service life of the spring is shortened, the service life of the check valve 001 is shortened, the check valve 001 is easily damaged, and the maintenance cost is increased. And the check valve 001 that provides in this embodiment, the surface that resets piece 300 has the elastic surface, and then can reduce cavitation erosion and destroy, compares current check valve 001, long service life, and is with low costs.

Referring to fig. 1 or fig. 2, in the present embodiment, the valve body 100 has an inner cavity and an inlet 110 and an outlet 120 opposite to each other, and both the inlet 110 and the outlet 120 are communicated with the inner cavity. The inner cavity can be a cylindrical cavity or a square cylindrical cavity and the like. The inlet 110 may be a cylindrical port or a square cylindrical port, etc., and the outlet 120 may be a cylindrical port or a square cylindrical port, etc. Optionally, the valve body 100 further comprises a connection end 130, the connection end 130 has a through hole 140, the through hole 140 communicates with the inlet 110, and a pipe can be connected by using the connection end 130.

Referring to fig. 3, in the present embodiment, the valve element 200 includes a blocking portion 210 and a connecting portion 220 connected to each other, a cross-sectional outer contour of the blocking portion 210 may be circular, a cross-sectional outer contour of the connecting portion 220 may be circular, and the blocking portion 210 and the connecting portion 220 are coaxially disposed. In other embodiments, the cross-sectional outer contour shape of the blocking portion 210 may be a polygon, and the cross-sectional outer contour shape of the connecting portion 220 may be a polygon.

Optionally, one end of the blocking portion 210 is connected to the connecting portion 220, and the blocking portion 210 is provided with a sealing surface 211, so that the sealing surface 211 can block the end of the inlet 110 close to the outlet 120 under the action of the restoring member 300. Optionally, the blocking portion 210 is in a conical structure or a circular truncated cone structure, that is, the outer peripheral surface of the blocking portion 210 is a sealing surface 211, the sealing surface 211 is a conical surface, the outer diameter of the blocking portion 210 gradually decreases from one end close to the connecting portion 220 to one end far away from the connecting portion 220 along the axial direction of the blocking portion, when the blocking portion 210 is located at a position blocking the inlet 110 and the outlet 120, the blocking portion 210 is inserted into the inlet 110, the sealing surface 211 is in sealing fit with one end of the inlet 110 close to the outlet 120, and after the pressure of the fluid flowing from the outlet 120 acts on the valve element 200, the sealing performance between the valve element 200 and the inlet 110 can. The blocking portion 210 of the valve element 200 is a conical structure, which can be adapted to the inlets 110 with different sizes on the valve body 100, and has a wide application range and improved sealing effect.

In other embodiments, the blocking portion 210 may have a polyhedral structure, the sealing surface 211 includes an inclined surface, and the valve plug 200 is inserted into the inlet 110 to enable the sealing surface 211 to be in sealing fit with the inlet 110, so that the sealing effect is good, and the valve plug can be adapted to sealing inlets 110 with different sizes.

In other embodiments, the end surface of the blocking portion 210 may be a sealing surface 211, and the end surface of the blocking portion 210 is used to cooperate with the end of the inlet 110 close to the outlet 120 to realize sealing.

Optionally, a flow channel 230 is disposed on the connecting portion 220, the flow channel 230 includes a first flow-through section 231 and a second flow-through section 232, one end of the first flow-through section 231 is communicated with the second flow-through section 232, one end of the first flow-through section 231, which is far away from the second flow-through section 232, extends to the outer peripheral wall of the connecting portion 220, and one end of the second flow-through section 232, which is far away from the first flow-through section 231, extends to an end face of the connecting portion 220, which is far away from the blocking portion 210. When fluid flows from the inlet 110 to the outlet 120, the fluid pushes the valve element 200 to move close to the outlet 120, the valve element 200 is disengaged from the inlet 110, and the fluid enters from the inlet 110, flows through the first flow-through section 231 and the second flow-through section 232, and then flows out from the outlet 120.

Optionally, the number of the first flow-through segments 231 may be one or more, and when the number of the first flow-through segments 231 is multiple, the multiple first flow-through segments 231 are uniformly arranged at intervals along the circumferential direction of the connecting portion 220, and the multiple first flow-through segments 231 are all communicated with the second flow-through segments 232. The fluid flowing from the inlet 110 can rapidly flow from the flow channel 230 to the outlet 120, improving the flow efficiency.

In this embodiment, all the surfaces of the restoring member 300 may be provided as elastic surfaces. Further, the restoring member 300 is made of rubber, nylon, high-pressure polyethylene, polypropylene, ABS plastic, glass fiber or building membrane. Wherein, the ABS plastic is a terpolymer of acrylonitrile (A), butadiene (B) and styrene (S). In other words, the above materials are all the existing materials, and the restoring member 300 can be obtained and processed directly. The reset piece 300 is made of one of the above materials, the whole reset piece 300 is an elastic piece and has deformation capacity, the valve core 200 can be always kept at the position blocking the inlet 110 and the outlet 120, the valve core 200 drives the reset piece 300 to move after being pushed by fluid, and the reset piece 300 has a movement trend of enabling the valve core 200 to face the position blocking the inlet 110 and the outlet 120. Simultaneously, the surface that resets 300 is the elastic surface, can further reduce the cavitation erosion and destroy, prolongs the life who resets 300 greatly, and then prolongs the life of check valve 001.

Further, the elastic modulus E of the resetting piece 300 is not greater than 1GPa, so that the elasticity of the resetting piece 300 is increased, and the resetting piece 300 has good toughness, and the resetting piece 300 can generate strong restoring force after being deformed, so that the valve element 200 can be kept at the position for plugging the inlet 110 and the outlet 120.

Obviously, in other embodiments, a portion of the surface of the restoring member 300 may be provided as an elastic surface.

It should be noted that the restoring member 300 may be made of an elastic material directly, or the restoring member 300 may be made of a non-elastic material, and then at least a part of the surface of the restoring member 300 is coated with an elastic material to form an elastic surface, which may also reduce cavitation damage.

In this embodiment, the reset member 300 may be a plate, the reset member 300 is connected to both the valve core 200 and the valve body 100, and both the reset member 300 and the valve core 200 are located in the inner cavity of the valve body 100 and between the inlet 110 and the outlet 120. Further, the reset piece 300 is annular, the reset piece 300 is sleeved outside the connecting portion 220 of the valve core 200 and is in sealing connection with the connecting portion 220, the outer circumferential wall of the reset piece 300 is in sealing connection with the inner circumferential wall of the valve body 100, and the port of the first circulation section 231, which is far away from the second circulation section 232, is located between the reset piece 300 and the inlet 110. The separation of piece 300 that resets is between import 110 and export 120, does not set up the opening on piece 300 that resets, and piece 300 that resets is an overall structure, and intensity is high, is difficult for being damaged. Further, the radius a of the reset member 300 is larger than the distance B between the inner peripheral wall of the valve body 100 and the outer peripheral wall of the valve core 200, for example, a is (1.1-1.3) B, and in the present embodiment, a is 1.2B. A portion of the reset member 300 is caught in the valve and/or the valve body 100, and the coupling strength of the reset member 300 with the valve cartridge 200 and/or the valve body 100 is improved.

In the check valve 001 of the present embodiment, when fluid enters from the inlet 110, the valve element 200 is pushed by the pressure of the fluid to move close to the outlet 120, the valve element 200 exposes the inlet 110, and the fluid can enter from the inlet 110 and flow through the flow channel 230 and then flow out from the outlet 120. When the fluid generates cavitation in the valve body 100, when the cavitation collapse position is located on the elastic surface of the reset piece 300, the collapse jet deviates from the elastic surface of the reset piece 300, so that the collapse jet is effectively prevented from damaging the reset piece 300, the one-way valve 001 is not easy to be damaged, the service life is long, and the cost is reduced.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A one-way valve, comprising:

2. The one-way valve of claim 1, wherein:

the reset piece is made of rubber, nylon, high-pressure polyethylene, polypropylene, ABS plastic, glass fiber or building membrane materials.

3. The one-way valve of claim 1, wherein:

the reset piece is annular, the reset piece is sleeved outside the valve core, the peripheral wall of the reset piece is in sealing connection with the valve body, the elastic surface is positioned on one side of the reset piece facing the inlet, and the reset piece is used for enabling the valve core to block the inlet; the valve core is provided with a flow channel, when fluid flows from the inlet to the outlet, the valve core can move under the pushing action of the fluid to expose the inlet, and then the fluid flowing in from the inlet flows out from the outlet after flowing through the flow channel.

4. The one-way valve of claim 3, wherein:

the flow channel comprises a first flow section and a second flow section which are communicated with each other, and one end, far away from the second flow section, of the first flow section extends to the outer peripheral surface of the valve core; one end of the second flow section, which is far away from the first flow section, extends to the end face of the valve core, which is far away from the inlet.

5. The one-way valve of claim 4, wherein:

the number of the first circulation sections is set to be a plurality, and the first circulation sections are communicated with the second circulation sections.

6. The one-way valve according to any one of claims 1 to 5, wherein:

the valve core is provided with a sealing surface, and the resetting piece is connected with the valve core and the valve body simultaneously and used for enabling the sealing surface to block the inlet.

7. The one-way valve of claim 6, wherein:

the sealing surface includes at least one ramp.

8. The one-way valve of claim 6, wherein:

the sealing surface is a conical surface.

9. The one-way valve of claim 1, wherein:

the elastic modulus of the resetting piece is less than 1 GPa.

10. A hydraulic system, comprising:

a one-way valve as claimed in any one of claims 1 to 9.