Bidirectional piston balance valve structure and gas spring

Abstract

The present application relates to the technical field of spring, especially to a bidirectional piston balance valve structure and gas spring, aiming at solving the problem that ordinary gas spring cannot stay at any position. The bidirectional piston balance valve structure comprises a cylinder and a valve core assembly, the valve core assembly is inserted into the cylinder and is in sliding connection with the cylinder; the valve core assembly comprises a first valve core and a second valve core, one end of the first valve core away from the second valve core is a first cavity, and one end of the second valve core away from the first valve core is a second cavity; the first valve core comprises a first piston body, a first sliding sleeve and a first return spring, and the second valve core comprises a second piston body, a second sliding sleeve and a second return spring. The bidirectional piston balance valve structure realizes the stay of the gas spring at any position in two directions through the first valve core and the second valve core, and plays the roles of a stretching valve and a compression valve.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of spring, in particular to a bidirectional piston balance valve structure and gas spring. BACKGROUND

[0002] The common gas spring can only stop the lifting object at the end of the stroke, and cannot stay the lifting object at any position of the stroke except the dead zone. In application, the door structure cannot be stopped at any angle, and the convenience is poor. SUMMARY

[0003] The purpose of the present application is to provide a bidirectional piston balance valve structure and gas spring to solve the problem that the common gas spring cannot stay at any position.

[0004] In order to solve the above technical problems, the technical scheme provided by the present application is as follows:

[0005] A bidirectional piston balance valve structure, comprising a cylinder and a valve core assembly, the valve core assembly is inserted into the cylinder and is in sliding connection with the cylinder;

[0006] The valve core assembly comprises a first valve core and a second valve core, one end of the first valve core away from the second valve core is a first cavity, and one end of the second valve core away from the first valve core is a second cavity;

[0007] The first valve core comprises a first piston body, a first sliding sleeve and a first return spring, and the second valve core comprises a second piston body, a second sliding sleeve and a second return spring;

[0008] The first sliding sleeve is sleeved on the first piston body and is in sliding connection with the first piston body; the first return spring is used to apply elastic force to the first sliding sleeve so that the first sliding sleeve abuts against the first piston body;

[0009] The second sliding sleeve is sleeved on the second piston body and is in sliding connection with the second piston body; the second return spring is used to apply elastic force to the second sliding sleeve so that the second sliding sleeve abuts against the second piston body;

[0010] A first passage is arranged on the first valve core and used to communicate the first cavity and the second cavity; a second passage is arranged on the second valve core and used to communicate the first cavity and the second cavity;

[0011] When the valve core assembly moves to the first cavity, the medium pressure in the first cavity rises and overcomes the elastic force of the second return spring to push the second sliding sleeve to move, so that the second passage is connected to communicate the first cavity and the second cavity;

[0012] When the valve core assembly moves towards the second cavity, the medium pressure in the second cavity rises and overcomes the elastic force of the first reset spring to push the first sliding sleeve to move, thereby connecting the first passage to communicate the first cavity and the second cavity.

[0013] Further, the first piston body is provided with a first axial hole and a first radial hole in communication, the first sliding sleeve is provided with a first communication hole, the first axial hole is in communication with the second cavity, and the first communication hole is in communication with the first cavity; when the first passage is connected, the first radial hole and the first communication hole are in communication.

[0014] The second piston body is provided with a second axial hole and a second radial hole in communication, the second sliding sleeve is provided with a second communication hole, the second axial hole is in communication with the first cavity, and the second communication hole is in communication with the second cavity; when the second passage is connected, the second radial hole and the second communication hole are in communication.

[0015] Further, the valve core assembly further comprises a first sealing ring, which is installed in a first annular groove formed by the first piston body, the second piston body, the first sliding sleeve and the second sliding sleeve.

[0016] The first annular groove is in communication with the first cavity and the second cavity.

[0017] When the valve core assembly moves towards the first cavity, the medium pressure in the first cavity rises and the first sealing ring is pressed against the second sliding sleeve, thereby cutting off the communication state between the first cavity and the second cavity.

[0018] When the valve core assembly moves towards the second cavity, the medium pressure in the second cavity rises and the first sealing ring is pressed against the first sliding sleeve, thereby cutting off the communication state between the first cavity and the second cavity.

[0019] Further, the first valve core further comprises a second sealing ring, and the second valve core further comprises a third sealing ring.

[0020] The second sealing ring is sleeved on the first piston body and inserted into the first sliding sleeve; two second sealing rings are respectively arranged on both sides of the first radial hole to cut off the communication state between the first radial hole and the first communication hole; the second sealing ring is installed on the first piston body or the first sliding sleeve.

[0021] The third sealing ring is sleeved on the second piston body and inserted into the second sliding sleeve; two third sealing rings are respectively arranged on both sides of the second radial hole to cut off the communication state between the second radial hole and the second communication hole; the third sealing ring is installed on the second piston body or the second sliding sleeve.

[0022] Further, the first valve core further comprises a first baffle, and the second valve core further comprises a second baffle;

[0023] One end of the first reset spring is abutted against the first sliding sleeve, and the other end is abutted against the first baffle; one end of the second reset spring is abutted against the second sliding sleeve, and the other end is abutted against the second baffle;

[0024] A first through hole is formed in the first baffle, and the first through hole is used for connecting the first cavity and the first communication hole;

[0025] A second through hole is formed in the second baffle, and the second through hole is used for connecting the second cavity and the second communication hole.

[0026] Further, the first axial hole is communicated with the second axial hole, a radial through hole is formed in the first piston body and / or the second piston body, one end of the radial through hole is communicated with the first annular groove, and the other end is communicated with the first axial hole and / or the second axial hole.

[0027] Further, the valve core assembly further comprises a piston rod, and the first valve core and the second valve core further comprise a fourth sealing ring;

[0028] The piston rod is inserted into the first baffle, the first piston body, the second piston body and the second baffle arranged in sequence;

[0029] The fourth sealing ring is used for sealing an annular gap between the piston rod and the first piston body and the second piston body.

[0030] In another aspect of the present application, a gas spring is provided, which comprises the above-mentioned bidirectional piston balance valve structure.

[0031] Further, the gas spring further comprises an isolation piston, the isolation piston is inserted into the cylinder and is in sliding connection with the cylinder;

[0032] The isolation piston and the valve core assembly are in a rodless cavity, one end of the valve core assembly away from the rodless cavity is in a rod cavity, and one end of the isolation piston away from the rodless cavity is in a pressure cavity;

[0033] The pressure cavity, the rod cavity and the rodless cavity are all filled with a medium.

[0034] Further, an axial communication groove is arranged on the inner wall of the cylinder, and the communication groove is used for connecting the first cavity and the second cavity.

[0035] The above-mentioned technical solutions are combined, and the technical effects that can be achieved by the present application are as follows:

[0036] The bidirectional piston balance valve structure provided by the application comprises a cylinder and a valve core assembly, the valve core assembly is inserted into the cylinder and is in sliding connection with the cylinder; the valve core assembly comprises a first valve core and a second valve core, the end of the first valve core away from the second valve core is a first cavity, and the end of the second valve core away from the first valve core is a second cavity; the first valve core comprises a first piston body, a first sliding sleeve and a first return spring, and the second valve core comprises a second piston body, a second sliding sleeve and a second return spring; the first sliding sleeve is sleeved on the first piston body and is in sliding connection with the first piston body; the first return spring is used to apply elastic force to the first sliding sleeve so that the first sliding sleeve is in abutment with the first piston body; the second sliding sleeve is sleeved on the second piston body and is in sliding connection with the second piston body; the second return spring is used to apply elastic force to the second sliding sleeve so that the second sliding sleeve is in abutment with the second piston body; a first passage is arranged on the first valve core and is used to communicate the first cavity and the second cavity; a second passage is arranged on the second valve core and is used to communicate the first cavity and the second cavity; when the valve core assembly moves towards the first cavity, the medium pressure in the first cavity rises and overcomes the elastic force of the second return spring to push the second sliding sleeve to move, and then the second passage is connected to communicate the first cavity and the second cavity; when the valve core assembly moves towards the second cavity, the medium pressure in the second cavity rises and overcomes the elastic force of the first return spring to push the first sliding sleeve to move, and then the first passage is connected to communicate the first cavity and the second cavity.

[0037] The bidirectional piston balance valve structure provided by the application realizes the effect of the stretching valve and the compression valve through the first valve core and the second valve core to realize the residence of the gas spring at any position in two directions. When the valve core assembly is driven by external force to move towards the first cavity, the space of the first cavity decreases and the pressure rises, and the space of the second cavity increases and the pressure decreases, so that a sufficient pressure difference is generated between the first cavity and the second cavity to push the second sliding sleeve, the movement of the second sliding sleeve opens the second passage and connects the first cavity and the second cavity, and the fluid pressure difference between the two cavities remains basically unchanged, and the resistance of the movement of the valve core assembly remains basically unchanged. That is, the elastic force of the second return spring makes the second sliding sleeve have a tendency to move towards the first cavity, and then a pressure difference is generated at both ends of the second sliding sleeve, and the pressure difference acts on the second sliding sleeve to balance the elastic force of the second return spring to maintain the connection state of the second passage. At the same time, the pressure difference acts on the inner section of the cylinder to generate a compression force against the load, thereby realizing the residence at any position. Similarly, the working process is the same when the valve core assembly is driven by external force to move towards the second cavity. The piston balance valve structure provided by the application can reliably realize the residence of the lifting object at any position in the stroke except the dead zone in the two directions of stretching and compression as the piston of the gas spring. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the specific embodiments or the prior art. Obviously, the drawings described in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0039] Figure 1 A schematic diagram of the bidirectional piston balance valve structure provided by the embodiment of the present application;

[0040] Figure 2 A schematic diagram of the bidirectional piston balance valve structure provided by the embodiment of the present application; Figure 1 An enlarged view of A in the middle;

[0041] Figure 3 A schematic diagram of the bidirectional piston balance valve structure provided by the embodiment of the present application;

[0042] Figure 4 A schematic diagram of the structure of the gas spring.

[0043] Figure: 10, cylinder; 30, first cavity; 40, second cavity; 50, isolation piston; 100, first valve core; 200, second valve core; 300, first sealing ring; 400, piston rod; 110, first piston body; 120, first sliding sleeve; 130, first return spring; 140, second sealing ring; 150, first baffle; 160, fourth sealing ring; 111, first axial hole; 112, first radial hole; 121, first communication hole; 151, first through hole; 210, second piston body; 220, second sliding sleeve; 230, second return spring; 240, third sealing ring; 250, second baffle; 211, second axial hole; 212, second radial hole; 221, second communication hole; 251, second through hole; 301, first annular groove. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0046] Some embodiments of the present application will be described in detail with reference to the drawings, which are shown by way of illustration. The following embodiments and features can be combined with each other, without conflict, if necessary.

[0047] The common gas spring can only stop the lifting object at the end of the stroke, and cannot stop the lifting object at any position of the stroke except the dead zone according to the requirement.

[0048] Therefore, the present application provides a bidirectional piston balance valve structure, which comprises a cylinder 10 and a valve core assembly, the valve core assembly is inserted into the cylinder 10 and is in sliding connection with the cylinder 10; the valve core assembly comprises a first valve core 100 and a second valve core 200, one end of the first valve core 100 away from the second valve core 200 is a first cavity 30, and one end of the second valve core 200 away from the first valve core 100 is a second cavity 40.

[0049] The first valve core 100 comprises a first piston body 110, a first sliding sleeve 120 and a first return spring 130, and the second valve core 200 comprises a second piston body 210, a second sliding sleeve 220 and a second return spring 230; the first sliding sleeve 120 is sleeved on the first piston body 110 and is in sliding connection with the first piston body 110; the first return spring 130 is used for applying elastic force to the first sliding sleeve 120 so that the first sliding sleeve 120 abuts against the first piston body 110; the second sliding sleeve 220 is sleeved on the second piston body 210 and is in sliding connection with the second piston body 210; the second return spring 230 is used for applying elastic force to the second sliding sleeve 220 so that the second sliding sleeve 220 abuts against the second piston body 210; a first passage is arranged on the first valve core 100 and is used for connecting the first cavity 30 and the second cavity 40; a second passage is arranged on the second valve core 200 and is used for connecting the first cavity 30 and the second cavity 40; when the valve core assembly moves towards the first cavity 30, the medium pressure in the first cavity 30 rises and overcomes the elastic force of the second return spring 230 to push the second sliding sleeve 220 to move, so that the second passage is connected to connect the first cavity 30 and the second cavity 40; when the valve core assembly moves towards the second cavity 40, the medium pressure in the second cavity 40 rises and overcomes the elastic force of the first return spring 130 to push the first sliding sleeve 120 to move, so that the first passage is connected to connect the first cavity 30 and the second cavity 40.

[0050] The bidirectional piston balance valve structure provided by the application realizes arbitrary position residence of the gas spring in two directions through the first valve core 100 and the second valve core 200, thereby realizing the effects of the stretching valve and the compression valve. When the valve core assembly is driven by external force to move towards the first cavity 30, the space of the first cavity 30 is reduced, and the pressure is increased; the space of the second cavity 40 is increased, and the pressure is reduced, so that a sufficient pressure difference is generated between the first cavity 30 and the second cavity 40 to push the second sliding sleeve 220, the movement of the second sliding sleeve 220 causes the second passage to be opened and the first cavity 30 and the second cavity 40 to be communicated, the fluid pressure difference between the two cavities remains basically unchanged, and the resistance of the movement of the valve core assembly remains basically unchanged. That is, the elastic force of the second return spring 230 causes the second sliding sleeve 220 to have a tendency to move towards the first cavity 30, and then a pressure difference is generated at both ends of the second sliding sleeve 220, the pressure difference acts on the second sliding sleeve 220, thereby balancing the elastic force of the second return spring 230 to maintain the communication state of the second passage. At the same time, the pressure difference acts on the inner section of the cylinder barrel 10 to generate an external compression force to resist the load, thereby realizing arbitrary position residence. Similarly, when the valve core assembly is driven by external force to move towards the second cavity 40, the working process is the same. The piston balance valve structure provided by the application can reliably realize arbitrary position residence of the lifting object in the stroke except the dead zone in the two directions of stretching and compression as the piston of the gas spring.

[0051] The following will be described in combination with Figures 1-4 The structure and shape of the bidirectional piston balance valve structure provided by the embodiment will be described in detail:

[0052] In the embodiment, the valve core assembly further comprises a first sealing ring 300, and the first sealing ring 300 is installed in a first annular groove 301 surrounded by the first piston body 110, the second piston body 210, the first sliding sleeve 120 and the second sliding sleeve 220; the first annular groove 301 is communicated with the first cavity 30 and the second cavity 40 through the annular gap between the first valve core 100 and the cylinder barrel 10 and the annular gap between the second valve core 200 and the cylinder barrel 10, respectively.

[0053] When the valve core assembly moves towards the first cavity 30, the medium pressure in the first cavity 30 is increased and the first sealing ring 300 is pressed against the second sliding sleeve 220, thereby cutting off the communication state between the first cavity 30 and the second cavity 40; when the valve core assembly moves towards the second cavity 40, the medium pressure in the second cavity 40 is increased and the first sealing ring 300 is pressed against the first sliding sleeve 120, thereby cutting off the communication state between the first cavity 30 and the second cavity 40.

[0054] In the optional scheme provided by the embodiment, the bidirectional piston balance valve structure further comprises a piston rod 400, the first valve core 100 further comprises a second sealing ring 140, a first baffle 150 and a fourth sealing ring 160, the second valve core 200 further comprises a third sealing ring 240, a second baffle 250 and a fourth sealing ring 160, as shown in Figure 1 、 Figure 2as shown.

[0055] Specifically, the piston rod 400 is inserted into the first baffle 150, the first piston body 110, the second piston body 210 and the second baffle 250 in sequence, and the fourth sealing ring 160 is used to seal the annular gap between the piston rod 400 and the first piston body 110 and the second piston body 210. Specifically, the end faces of the first piston body 110 and the second piston body 210 away from each other are provided with grooves and surround annular grooves with the first baffle 150 and the second baffle 250 respectively for installing the fourth sealing ring 160. The first return spring 130 and the second return spring 230 are both compression springs; one end of the first return spring 130 abuts against the first sliding sleeve 120, and the other end abuts against the first baffle 150; one end of the second return spring 230 abuts against the second sliding sleeve 220, and the other end abuts against the second baffle 250.

[0056] In this embodiment, the first baffle 150 can be connected with the piston rod 400 by welding, threaded connection, pressure connection and the like, and the second baffle 250 abuts against the step of the piston rod 400, so as to realize the connection of the piston rod 400 with the first valve core 100 and the second valve core 200.

[0057] In this embodiment, the first baffle 150 is provided with a first through hole 151, the first piston body 110 is provided with a first axial hole 111 and a first radial hole 112 in communication, the first sliding sleeve 120 is provided with a first communication hole 121, the first axial hole 111 is in communication with the first annular groove 301, the first communication hole 121 is in communication with the first through hole 151, and the first through hole 151 is in communication with the first cavity 30; when the first passage is connected, the first radial hole 112 and the first communication hole 121 are in communication. Similarly, the second baffle 250 is provided with a second through hole 251, the second piston body 210 is provided with a second axial hole 211 and a second radial hole 212 in communication, the second sliding sleeve 220 is provided with a second communication hole 221, the second axial hole 211 is in communication with the first annular groove 301, the second communication hole 221 is in communication with the second through hole 251, and the second through hole 251 is in communication with the second cavity 40; when the second passage is connected, the second radial hole 212 and the second communication hole 221 are in communication.

[0058] In the embodiment, the second sealing ring 140 is sleeved on the first piston body 110 and inserted into the first sliding sleeve 120; two second sealing rings 140 are arranged on the two sides of the first radial hole 112 respectively to cut off the communication state of the first radial hole 112 and the first communication hole 121. The second sealing ring 140 is mounted on the first piston body 110 or the first sliding sleeve 120, that is, an annular groove is formed on the first piston body 110 or the first sliding sleeve 120 for mounting the second sealing ring 140. Similarly, the third sealing ring 240 is sleeved on the second piston body 210 and inserted into the second sliding sleeve 220; two third sealing rings 240 are arranged on the two sides of the second radial hole 212 respectively to cut off the communication state of the second radial hole 212 and the second communication hole 221, and the third sealing ring 240 is mounted on the second piston body 210 or the second sliding sleeve 220, that is, an annular groove is formed on the second piston body 210 or the second sliding sleeve 220 for mounting the third sealing ring 240.

[0059] In the embodiment, the first axial hole 111 is communicated with the second axial hole 211, and the communication of the first annular groove 301 with the first axial hole 111 and the second axial hole 211 can be realized through the gap between the end faces of the first piston body 110 and the second piston body 210 abutting, or a radial through hole can be formed on the first piston body 110 and / or the second piston body 210, one end of the radial through hole is communicated with the first annular groove 301, and the other end is communicated with the first axial hole 111 and / or the second axial hole 211, so as to increase the communication cross-sectional area.

[0060] In the embodiment, the communication between the first through hole 151 and the first communication hole 121 is realized through the annular gap between the cylinder barrel 10 and the first sliding sleeve 120; the communication between the second through hole 251 and the second communication hole 221 is realized through the annular gap between the cylinder barrel 10 and the second sliding sleeve 220. The annular gap between the first baffle 150, the second baffle 250 and the cylinder barrel 10 can also be used as a medium channel. The first radial hole 112 and the first communication hole 121 can be communicated through the annular gap between the first sliding sleeve 120 and the first piston body 110, in order to increase the communication cross-sectional area of the first radial hole 112 and the first communication hole 121, a communication groove or an annular groove can be formed on the first sliding sleeve 120 for connecting the first radial hole 112 and the first communication hole 121. Similarly, the second radial hole 212 and the second communication hole 221 can adopt the same structure, that is, communicated through the annular gap between the first sliding sleeve 120 and the first piston body 110 or a communication groove or an annular groove is formed on the first sliding sleeve 120.

[0061] In the embodiment, the first sealing ring 300 is in frictional contact with the cylinder barrel 10, and when the first valve core 100 and the second valve core 200 move, the first sealing ring 300 can remain stationary under the friction of the cylinder barrel 10, so as to abut against one of the valve cores or the second valve core 200 and form a seal.

[0062] In this embodiment, the first valve core 100 and the second valve core 200 can be configured to be structurally symmetrical and symmetrically arranged.

[0063] The working process of the bidirectional piston balance valve structure provided in this embodiment is as follows:

[0064] In the initial state, the first chamber 30 and the second chamber 40 are connected through the annular gap between the cylinder 10 and the valve core assembly to achieve pressure balance between them, such as... Figure 2 As shown.

[0065] When the piston rod 400 is pushed by an external force to move the valve core assembly toward the first chamber 30, the first sealing ring 300 remains stationary due to the frictional resistance of the inner wall of the cylinder 10, thus moving closer to the end of the second sliding sleeve 220. The first sealing ring 300 presses against the second sliding sleeve 220 and seals the annular gap between the second sliding sleeve 220 and the cylinder 10, and between the second sliding sleeve 220 and the second piston body 210, thereby isolating the first chamber 30 and the second chamber 40 by the valve core, and the two chambers are no longer connected. As the space of the first chamber 30 decreases and the space of the second chamber 40 increases, a pressure difference is generated.

[0066] As the pressure difference increases, the first sealing ring 300 pushes the second sliding sleeve 220 to move to the right to compress the second return spring 230. As the communicating groove on the inner wall of the second sliding sleeve 220 passes the third sealing ring 240, the second radial hole 212 communicates with the second communicating hole 221, as... Figure 3 As shown. The media in the first chamber 30 and the second chamber 40 are connected sequentially through the annular gap between the first valve core 100 and the cylinder 10, the first annular groove 301, the end face gap between the first piston body 110 and the second piston body 210, the second axial hole 211, the second radial hole 212, and the second connecting hole 221. The pressure difference between the two chambers remains basically constant, and the resistance to the movement of the valve core assembly remains basically constant. The second return spring 230 tends to push the second sliding sleeve 220 to the left. This tendency will compress the space of the first chamber 30 and increase the space of the second chamber 40, thereby creating a pressure difference between the first chamber 30 and the second chamber 40. This pressure difference acts on the second sliding sleeve 220 and balances with the elastic force of the second return spring 230 to prevent the second sliding sleeve 220 from resetting and cutting off the connection between the first chamber 30 and the second chamber 40.

[0067] Simultaneously, this pressure difference acts on the inner cross-section of cylinder 10 to generate an outward compressive force, thereby balancing the load and creating the effect of remaining in any position. Once the valve core assembly has moved to the desired position, removing the external force to stop pushing the valve core assembly will allow it to stop at any position.

[0068] When the valve core assembly moves to the second chamber 40, the first valve core 100 is activated. Its working process and principle are the same as those of the second valve core 200, and will not be described again.

[0069] Based on the bidirectional piston balance valve structure provided in the embodiment, a gas spring is provided, which comprises the bidirectional piston balance valve structure and further comprises an isolation piston 50 which is inserted into the cylinder barrel 10 and is in sliding connection with the cylinder barrel 10. Specifically, as shown in the figure, the isolation piston 50 and the valve core assembly are in a rodless cavity, the valve core assembly is away from the rodless cavity, and the isolation piston 50 is away from the rodless cavity. The end of the pressure cavity. The pressure cavity, the rod cavity and the rodless cavity are filled with medium, such as nitrogen, oil-gas mixture, hydraulic oil, etc., wherein the medium in the rod cavity and the rodless cavity is the same. Figure 1

[0070] In the embodiment, the inner wall of the cylinder barrel 10 is provided with a communication groove extending in the axial direction, and the communication groove is used to communicate the first cavity 30 and the second cavity 40. When the valve core is located at the communication groove, the first cavity 30 and the second cavity 40 are always communicated by the communication groove and will not be blocked by the valve core assembly. The gas spring generates thrust through the difference in cross-sectional area of the rod cavity and the rodless cavity, so as to not generate the effect of staying at any position. Specifically, a plurality of communication grooves can be arranged along the axial direction of the cylinder barrel 10, so as to realize the segmented opening of the gas spring. At this time, the section covered by the communication groove can realize the self-moving of the piston rod 400 by a distance, and after leaving the communication groove coverage area, the bidirectional piston balance valve structure is in action, and the valve core assembly stops moving. If you want to continue to move, you need to exert additional force, so as to realize the segmented stop.

[0071] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.​

Claims

1. A bidirectional piston balanced valve structure, characterized by, The application relates to a valve core assembly and a cylinder barrel. The valve core assembly comprises a first valve core (100) and a second valve core (200), the first valve core (100) is provided with a first cavity (30) at one end away from the second valve core (200), and the second valve core (200) is provided with a second cavity (40) at one end away from the first valve core (100). The first valve core (100) comprises a first piston body (110), a first sliding sleeve (120) and a first reset spring (130), and the second valve core (200) comprises a second piston body (210), a second sliding sleeve (220) and a second reset spring (230). The first sliding sleeve (120) is sleeved on the first piston body (110) and is in sliding connection with the first piston body (110), and the first reset spring (130) is used for applying elastic force to the first sliding sleeve (120) so that the first sliding sleeve (120) abuts against the first piston body (110). The second sliding sleeve (220) is sleeved on the second piston body (210) and is in sliding connection with the second piston body (210), and the second reset spring (230) is used for applying elastic force to the second sliding sleeve (220) so that the second sliding sleeve (220) abuts against the second piston body (210). The first valve core (100) is provided with a first passage for connecting the first cavity (30) and the second cavity (40), and the second valve core (200) is provided with a second passage for connecting the first cavity (30) and the second cavity (40). When the valve core assembly moves towards the first cavity (30), the medium pressure in the first cavity (30) is increased and the elastic force of the second reset spring (230) is overcome to push the second sliding sleeve (220) to move, so that the second passage is connected to connect the first cavity (30) and the second cavity (40). When the valve core assembly moves towards the second cavity (40), the medium pressure in the second cavity (40) is increased and the elastic force of the first reset spring (130) is overcome to push the first sliding sleeve (120) to move, so that the first passage is connected to connect the first cavity (30) and the second cavity (40).

2. The bidirectional piston balanced valve structure according to claim 1, characterized in that, The first piston body (110) is provided with a first axial hole (111) and a first radial hole (112) in communication, the first sliding sleeve (120) is provided with a first communication hole (121), the first axial hole (111) is in communication with the second cavity (40), the first communication hole (121) is in communication with the first cavity (30), and the first radial hole (112) and the first communication hole (121) are in communication when the first passage is connected. The second piston body (210) is provided with a second axial hole (211) and a second radial hole (212) in communication, and the second sliding sleeve (220) is provided with a second communication hole (221) in communication; the second axial hole (211) is in communication with the first cavity (30), and the second communication hole (221) is in communication with the second cavity (40); when the second passage is connected, the second radial hole (212) and the second communication hole (221) are in communication.

3. The bidirectional piston balanced valve structure according to claim 2, wherein The valve core assembly further comprises a first sealing ring (300) installed in a first annular groove (301) formed by the first piston body (110), the second piston body (210), the first sliding sleeve (120) and the second sliding sleeve (220); The first annular groove (301) is in communication with the first cavity (30) and the second cavity (40); When the valve core assembly moves towards the first cavity (30), the medium pressure in the first cavity (30) rises and makes the first sealing ring (300) press tightly the second sliding sleeve (220), so as to cut off the communication state between the first cavity (30) and the second cavity (40); When the valve core assembly moves towards the second cavity (40), the medium pressure in the second cavity (40) rises and makes the first sealing ring (300) press tightly the first sliding sleeve (120), so as to cut off the communication state between the first cavity (30) and the second cavity (40).

4. The bidirectional piston balanced valve structure according to claim 3, wherein The first valve core (100) further comprises a second sealing ring (140), and the second valve core (200) further comprises a third sealing ring (240); The second sealing ring (140) is sleeved on the first piston body (110) and inserted in the first sliding sleeve (120); two second sealing rings (140) are respectively arranged on both sides of the first radial hole (112) to cut off the communication state between the first radial hole (112) and the first communication hole (121); the second sealing ring (140) is installed on the first piston body (110) or the first sliding sleeve (120); The third sealing ring (240) is sleeved on the second piston body (210) and inserted in the second sliding sleeve (220); two third sealing rings (240) are respectively arranged on both sides of the second radial hole (212) to cut off the communication state between the second radial hole (212) and the second communication hole (221); the third sealing ring (240) is installed on the second piston body (210) or the second sliding sleeve (220).

5. The two-way piston balanced valve structure according to claim 4, wherein The first valve core (100) further comprises a first baffle (150), and the second valve core (200) further comprises a second baffle (250); One end of the first return spring (130) abuts against the first sliding sleeve (120), and the other end abuts against the first baffle (150); one end of the second return spring (230) abuts against the second sliding sleeve (220), and the other end abuts against the second baffle (250); One end of the first return spring (130) abuts against the first sliding sleeve (120), and the other end abuts against the first baffle (150); one end of the second return spring (230) abuts against the second sliding sleeve (220), and the other end abuts against the second baffle (250); A first through hole (151) is formed in the first baffle (150) and is used for connecting the first cavity (30) and the first communication hole (121); A second through hole (251) is formed in the second baffle (250) and is used for connecting the second cavity (40) and the second communication hole (221).

6. The bidirectional piston balanced valve structure according to claim 5, wherein The first axial hole (111) is communicated with the second axial hole (211), and a radial through hole is formed in the first piston body (110) and / or the second piston body (210), one end of the radial through hole is communicated with the first annular groove (301), and the other end of the radial through hole is communicated with the first axial hole (111) and / or the second axial hole (211).

7. The two-way piston balanced valve structure according to claim 6, characterized by The valve core assembly further comprises a piston rod (400), and the first valve core (100) and the second valve core (200) further comprise a fourth sealing ring (160); The piston rod (400) is inserted into the first baffle (150), the first piston body (110), the second piston body (210) and the second baffle (250) arranged in sequence; The fourth sealing ring (160) is used for sealing the annular gap between the piston rod (400) and the first piston body (110) and the second piston body (210).

8. A gas spring, characterized by The bidirectional piston balance valve structure comprises the bidirectional piston balance valve structure according to any one of claims 1-7.

9. The gas spring of claim 8, wherein, Further comprising an isolation piston (50) which is inserted into the cylinder barrel (10) and is in sliding connection with the cylinder barrel (10); The isolation piston (50) and the valve core assembly are in a rodless cavity, one end of the valve core assembly away from the rodless cavity is in a rod cavity, and one end of the isolation piston (50) away from the rodless cavity is in a pressure cavity; The pressure cavity, the rod cavity and the rodless cavity are all filled with a medium.

10. The gas spring of claim 8, wherein, An inner wall of the cylinder barrel (10) is provided with an axial communication groove which is used for connecting the first cavity (30) and the second cavity (40).

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