Bidirectional piston balance valve structure and gas spring

Abstract

The invention relates to the technical field of springs, in particular to a bidirectional piston balance valve structure and a gas spring, and aims to solve the problem that a common gas spring cannot reside at any position. The bidirectional piston balance valve structure comprises a cylinder barrel and a valve element assembly, wherein the valve element assembly is inserted into the cylinder barrel and is in sliding connection with the cylinder barrel; the valve element assembly comprises a first valve element and a second valve element, the end, away from the second valve element, of the first valve element is a first cavity, and the end, away from the first valve element, of the second valve element is a second cavity. The first valve element comprises a first piston body, a first sliding sleeve and a first reset spring. The second valve element comprises a second piston body, a second sliding sleeve and a second reset spring. According to the bidirectional piston balance valve structure, the air spring can reside at any position in two directions through the first valve element and the second valve element, and the functions of a stretching valve and a compression valve are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of springs, and in particular to a bidirectional piston balancing valve structure and a gas spring. Background Art

[0002] Ordinary gas springs can only stop the lifted object at the end of the stroke, and cannot stop the lifted object at any position of the stroke except the dead zone as needed. When used, it is impossible to stop structures such as doors at any angle, and the convenience of use is poor. Summary of the invention

[0003] The object of the present invention is to provide a two-way piston balance valve structure and a gas spring to solve the problem that ordinary gas springs cannot stay at any position.

[0004] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0005] A two-way piston balance valve structure comprises a cylinder barrel and a valve core assembly, wherein the valve core assembly is inserted into the cylinder barrel and is slidably connected to the cylinder barrel;

[0006] The valve core assembly comprises a first valve core and a second valve core, an end of the first valve core away from the second valve core is a first cavity, and an 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 slidably connected to 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 slidably connected to 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] The first valve core is provided with a first passage for connecting the first cavity and the second cavity; the second valve core is provided with a second passage, and the second passage is used to connect the first cavity and the second cavity;

[0011] When the valve core assembly moves toward the first chamber, the medium pressure in the first chamber increases and overcomes the elastic force of the second return spring to push the second sliding sleeve to move, thereby connecting the second passage to connect the first chamber and the second chamber;

[0012] When the valve core assembly moves toward the second chamber, the medium pressure in the second chamber increases and overcomes the elastic force of the first return spring to push the first sleeve to move, thereby connecting the first passage to communicate the first chamber with the second chamber.

[0013] Furthermore, the first piston body is provided with a first axial hole and a first radial hole that are connected, the first sleeve is provided with a first connecting hole, the first axial hole is connected with the second cavity, and the first connecting hole is connected with the first cavity; when the first passage is connected, the first radial hole is connected with the first connecting hole;

[0014] The second piston body is provided with a second axial hole and a second radial hole that are connected, and the second sliding sleeve is provided with a second connecting hole. The second axial hole is connected to the first cavity, and the second connecting hole is connected to the second cavity. When the second passage is connected, the second radial hole and the second connecting hole are connected.

[0015] Furthermore, the valve core assembly further includes 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 toward the first chamber, the medium pressure in the first chamber increases and causes the first sealing ring to press against the second sleeve, thereby cutting off the communication between the first chamber and the second chamber;

[0018] When the valve core assembly moves toward the second chamber, the medium pressure in the second chamber increases and causes the first sealing ring to press against the first sliding sleeve, thereby cutting off the communication between the first chamber and the second chamber.

[0019] Furthermore, the first valve core further includes a second sealing ring, and the second valve core further includes 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 communicating 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 sleeve; the two third sealing rings are respectively arranged on both sides of the second radial hole to cut off the connection between the second radial hole and the second connecting hole; the third sealing ring is installed on the second piston body or the second sleeve.

[0022] Furthermore, the first valve core further includes a first baffle plate, and the second valve core further includes a second baffle plate;

[0023] One end of the first return spring abuts against the first sliding sleeve, and the other end abuts against the first baffle plate; one end of the second return spring abuts against the second sliding sleeve, and the other end abuts against the second baffle plate;

[0024] A first through hole is formed on the first baffle plate, and the first through hole is used to connect the first cavity and the first connecting hole;

[0025] A second through hole is formed on the second baffle, and the second through hole is used to connect the second cavity and the second connecting hole.

[0026] Furthermore, the first axial hole is connected to the second axial hole, and a radial through hole is provided on the first piston body and / or the second piston body, one end of the radial through hole is connected to the first annular groove, and the other end is connected to the first axial hole and / or the second axial hole.

[0027] Furthermore, the valve core assembly further includes a piston rod, and the first valve core and the second valve core further include 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 which are arranged in sequence;

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

[0030] Another aspect of the present invention provides a gas spring, comprising the above-mentioned bidirectional piston balancing valve structure.

[0031] Furthermore, the gas spring further comprises an isolating piston, which is inserted into the cylinder and slidably connected to the cylinder;

[0032] A rodless cavity is formed between the isolation piston and the valve core assembly, an end of the valve core assembly away from the rodless cavity is a rod cavity, and an end of the isolation piston away from the rodless cavity is a pressure cavity;

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

[0034] Furthermore, the inner wall of the cylinder is provided with a connecting groove extending in the axial direction, and the connecting groove is used to connect the first cavity and the second cavity.

[0035] Based on the above technical solutions, the technical effects that can be achieved by the present invention are:

[0036] The two-way piston balancing valve structure provided by the present invention comprises a cylinder and a valve core assembly, the valve core assembly is inserted into the cylinder and is slidably connected to 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 sleeve and a first return spring, and the second valve core comprises a second piston body, a second sleeve and a second return spring; the first sleeve is sleeved on the first piston body and is slidably connected to the first piston body; the first return spring is used to apply elastic force to the first sleeve so that the first sleeve abuts against the first piston body; the second sleeve is sleeved on the second piston body and is slidably connected to the second piston body The valve body is slidably connected; the second return spring is used to apply elastic force to the second sleeve so that the second sleeve abuts against the second piston body; the first valve core is provided with a first passage for connecting the first chamber and the second chamber; the second valve core is provided with a second passage, and the second passage is used to connect the first chamber and the second chamber; when the valve core assembly moves toward the first chamber, the medium pressure in the first chamber increases and overcomes the elastic force of the second return spring to push the second sleeve to move, thereby connecting the second passage to connect the first chamber and the second chamber; when the valve core assembly moves toward the second chamber, the medium pressure in the second chamber increases and overcomes the elastic force of the first return spring to push the first sleeve to move, thereby connecting the first passage to connect the first chamber and the second chamber.

[0037] The bidirectional piston balancing valve structure provided by the present invention realizes the gas spring to stay at any position in two directions through the first valve core and the second valve core, thereby realizing the effect of the stretch valve and the compression valve. When the external force drives the valve core assembly to move toward the first chamber, the space of the first chamber decreases and the pressure increases, and the space of the second chamber increases and the pressure decreases, so that a sufficient pressure difference is generated between the first chamber and the second chamber to push the second sleeve, and the movement of the second sleeve opens the second passage and connects the first chamber and the second chamber, and the pressure difference of the fluids in the two chambers remains basically unchanged, and the resistance to the movement of the valve core assembly remains basically unchanged. That is, the elastic force of the second return spring causes the second sleeve to have a tendency to move toward the first chamber, and then a pressure difference is generated at both ends of the second sleeve, and this pressure difference acts on the second sleeve to balance the elastic force of the second return spring to maintain the connected state of the second passage. At the same time, this pressure difference acts on the inner section of the cylinder to generate an external compression force to resist the load, thereby realizing the stay at any position. Similarly, the working process when the external force drives the valve core assembly to move toward the second chamber is the same. The piston balance valve structure provided by the present invention, as the piston of the gas spring, can reliably achieve the retention of the lifted object at any position of the stroke except the dead zone in both the stretching and compression directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 A schematic diagram of a bidirectional piston balancing valve structure provided in an embodiment of the present invention;

[0040] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0041] Figure 3 It is a schematic diagram of the structure of a two-way piston balance valve in a compressed state;

[0042] Figure 4 It is a schematic diagram of the structure of a gas spring.

[0043] Icons: 10, cylinder; 30, first chamber; 40, second chamber; 50, isolation piston; 100, first valve core; 200, second valve core; 300, first sealing ring; 400, piston rod; 110, first piston body; 120, first 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 connecting hole; 151, first through hole; 210, second piston body; 220, second sleeve; 230, second return spring; 240, third sealing ring; 250, second baffle; 211, second axial hole; 212, second radial hole; 221, second connecting 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 invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0047] Ordinary gas springs can only stop the lifted object at the end of the stroke, and cannot stop the lifted object at any position of the stroke except the dead zone as needed.

[0048] In view of this, the present invention provides a two-way piston balance valve structure, including a cylinder 10 and a valve core assembly, the valve core assembly is inserted into the cylinder 10 and is slidably connected to the cylinder 10; the valve core assembly includes a first valve core 100 and a second valve core 200, the end of the first valve core 100 away from the second valve core 200 is a first cavity 30, and the 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 includes a first piston body 110, a first sleeve 120 and a first return spring 130, and the second valve core 200 includes a second piston body 210, a second sleeve 220 and a second return spring 230; the first sleeve 120 is sleeved on the first piston body 110 and is slidably connected to the first piston body 110; the first return spring 130 is used to apply an elastic force to the first sleeve 120 so that the first sleeve 120 abuts against the first piston body 110; the second sleeve 220 is sleeved on the second piston body 210 and is slidably connected to the second piston body 210; the second return spring 230 is used to apply an elastic force to the second sleeve 220 so that the second sleeve 220 abuts against the second piston body 2 10; A first passage is provided on the first valve core 100 for connecting the first chamber 30 and the second chamber 40; A second passage is provided on the second valve core 200, and the second passage is used to connect the first chamber 30 and the second chamber 40; When the valve core assembly moves toward the first chamber 30, the medium pressure in the first chamber 30 increases and overcomes the elastic force of the second return spring 230 to push the second sleeve 220 to move, thereby connecting the second passage to connect the first chamber 30 and the second chamber 40; When the valve core assembly moves toward the second chamber 40, the medium pressure in the second chamber 40 increases and overcomes the elastic force of the first return spring 130 to push the first sleeve 120 to move, thereby connecting the first passage to connect the first chamber 30 and the second chamber 40.

[0050] The bidirectional piston balancing valve structure provided by the present invention realizes the gas spring to reside at any position in two directions through the first valve core 100 and the second valve core 200, thereby realizing the effect of a stretch valve and a compression valve. When the external force drives the valve core assembly to move toward the first chamber 30, the space of the first chamber 30 is reduced and the pressure is increased, and the space of the second chamber 40 is increased and the pressure is reduced, so that a sufficient pressure difference is generated between the first chamber 30 and the second chamber 40 to push the second sleeve 220, and the movement of the second sleeve 220 opens the second passage and connects the first chamber 30 and the second chamber 40, and the pressure difference of the fluids in the two chambers remains basically unchanged, and the resistance to the movement of the valve core assembly remains basically unchanged. That is, the elastic force of the second return spring 230 causes the second sleeve 220 to have a tendency to move toward the first chamber 30, and then a pressure difference is generated at both ends of the second sleeve 220, and this pressure difference acts on the second sleeve 220 to balance the elastic force of the second return spring 230 to maintain the connection state of the second passage. At the same time, this pressure difference acts on the inner section of the cylinder 10 to generate an external compression force to resist the load, thereby realizing the residence at any position. Similarly, the working process is the same when the external force drives the valve core assembly to move toward the second chamber 40. The piston balance valve structure provided by the present invention as the piston of the gas spring can reliably achieve the lifting object to stay at any position of the stroke except the dead zone in both the tension and compression directions.

[0051] The following combination Figure 1-Figure 4 The structure and shape of the bidirectional piston balancing valve structure provided in this embodiment are described in detail:

[0052] In this embodiment, the valve core assembly also includes a first sealing ring 300, which is installed in a first annular groove 301 surrounded by the first piston body 110, the second piston body 210, the first sleeve 120 and the second sleeve 220; the first annular groove 301 is connected to the first chamber 30 and the second chamber 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 toward the first chamber 30, the medium pressure in the first chamber 30 increases and causes the first sealing ring 300 to press against the second sleeve 220, thereby cutting off the connection between the first chamber 30 and the second chamber 40; when the valve core assembly moves toward the second chamber 40, the medium pressure in the second chamber 40 increases and causes the first sealing ring 300 to press against the first sleeve 120, thereby cutting off the connection between the first chamber 30 and the second chamber 40.

[0054] In the optional solution provided in this embodiment, the bidirectional piston balancing valve structure further includes a piston rod 400, the first valve core 100 further includes a second sealing ring 140, a first baffle 150 and a fourth sealing ring 160, and the second valve core 200 further includes a third sealing ring 240, a second baffle 250 and a fourth sealing ring 160. Figure 1 , Figure 2shown.

[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 which are arranged 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 surfaces of the first piston body 110 and the second piston body 210 which are away from each other are provided with grooves and respectively form annular grooves with the first baffle 150 and the second baffle 250 for installing the fourth sealing ring 160. The first return spring 130 and the second return spring 230 are both configured as 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 to the piston rod 400 by welding, threaded connection, crimping, etc., and the second baffle 250 abuts against the step of the piston rod 400, thereby realizing the connection between the piston rod 400 and the first valve core 100 and the second valve core 200.

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

[0058] In this embodiment, the second sealing ring 140 is sleeved on the first piston body 110 and inserted into the first 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 sleeve 120, that is, an annular groove is provided on the first piston body 110 or the first sleeve 120 for installing the second sealing ring 140. Similarly, the third sealing ring 240 is sleeved on the second piston body 210 and inserted into the second 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, and the third sealing ring 240 is installed on the second piston body 210 or the second sleeve 220, that is, an annular groove is provided on the second piston body 210 or the second sleeve 220 for installing the third sealing ring 240.

[0059] In this embodiment, the first axial hole 111 is connected to the second axial hole 211, and the connection between the first annular groove 301 and the first axial hole 111 and the second axial hole 211 can be achieved through the gap between the end surfaces of the first piston body 110 and the second piston body 210. A radial through hole can also be opened on the first piston body 110 and / or the second piston body 210, one end of the radial through hole is connected to the first annular groove 301, and the other end is connected to the first axial hole 111 and / or the second axial hole 211, thereby increasing the connecting cross-sectional area.

[0060] In this embodiment, the communication between the first through hole 151 and the first communication hole 121 is achieved through the annular gap between the cylinder barrel 10 and the first sleeve 120; the communication between the second through hole 251 and the second communication hole 221 is achieved through the annular gap between the cylinder barrel 10 and the second 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 connected through the annular gap between the first sleeve 120 and the first piston body 110. In order to increase the connecting cross-sectional area between the first radial hole 112 and the first communication hole 121, a connecting groove or annular groove can be provided on the first sleeve 120 to connect 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, they are connected through the annular gap between the first sleeve 120 and the first piston body 110 or a connecting groove or annular groove is provided on the first sleeve 120.

[0061] In this embodiment, the first sealing ring 300 is in frictional contact with the cylinder 10. When the first valve core 100 and the second valve core 200 move, the first sealing ring 300 can remain stationary under the friction force of the cylinder 10, thereby abutting against a valve core or the second valve core 200 and forming a seal.

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

[0063] The working process of the bidirectional piston balancing 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 the two. Figure 2 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 is held immobile by the friction resistance of the inner wall of the cylinder 10 and approaches the end of the second sleeve 220. The first sealing ring 300 presses the second sleeve 220 and seals the annular gaps between the second sleeve 220 and the cylinder 10, and between the second sleeve 220 and the second piston body 210, so that the first chamber 30 and the second chamber 40 are separated 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 sleeve 220 to move rightward to compress the second return spring 230. As the connecting groove on the inner wall of the second sleeve 220 passes over the third sealing ring 240, the second radial hole 212 is connected to the second connecting hole 221. Figure 3 As shown. The medium in the first chamber 30 and the second chamber 40 is connected through the annular gap between the first valve core 100 and the cylinder barrel 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, and the pressure difference between the two chambers remains basically unchanged, and the resistance to the movement of the valve core assembly remains basically unchanged. The second return spring 230 generates a tendency to push the second sleeve 220 to move leftward, which will generate a tendency to compress the space of the first chamber 30 and increase the space of the second chamber 40, thereby generating a pressure difference between the first chamber 30 and the second chamber 40. This pressure difference acts on the second sleeve 220 and is balanced with the elastic force of the second return spring 230 to avoid the second sleeve 220 resetting and causing the connection between the first chamber 30 and the second chamber 40 to be cut off.

[0067] At the same time, this pressure difference acts on the inner section of the cylinder 10 to generate an external compression force, thereby balancing the load and producing an effect of staying at any position. When the valve core assembly moves to the desired position, the valve core assembly can be stopped at any position by removing the external force to stop pushing the valve core assembly.

[0068] When the valve core assembly moves toward the second chamber 40 , the first valve core 100 is working, and its working process and principle are the same as those of the second valve core 200 , which will not be described in detail.

[0069] Based on the bidirectional piston balancing valve structure provided in this embodiment, a gas spring is proposed, including the bidirectional piston balancing valve structure described above, and also including an isolation piston 50, which is inserted into the cylinder 10 and slidably connected to the cylinder 10. Specifically, Figure 1 As shown, there is a rodless chamber between the isolation piston 50 and the valve core assembly, the end of the valve core assembly away from the rodless chamber is a rod chamber, and the end of the isolation piston 50 away from the rodless chamber is a pressure chamber. The pressure chamber, the rod chamber and the rodless chamber are all filled with medium, such as nitrogen, oil-gas mixture, hydraulic oil, etc., wherein the medium in the rod chamber and the rodless chamber is the same.

[0070] In this embodiment, the inner wall of the cylinder 10 is provided with a connecting groove extending in the axial direction, and the connecting groove is used to connect the first chamber 30 and the second chamber 40. When the valve core is located at the connecting groove, the first chamber 30 and the second chamber 40 are always connected by the connecting groove and will not be blocked by the valve core assembly. The gas spring generates thrust through the cross-sectional area difference between the rod chamber and the rodless chamber, thereby not producing the effect of staying at any position. Specifically, a plurality of connecting grooves can be arranged at intervals along the axial direction of the cylinder 10 to realize the segmented opening of the gas spring. At this time, the piston rod 400 can move a certain distance by itself in the section covered by the connecting groove. After leaving the area covered by the connecting groove, the two-way piston balancing valve structure takes effect, and the valve core assembly stops moving. If it needs to continue to move, additional force is required to realize segmented stopping.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A two-way piston balancing valve structure, characterized in that: It comprises a cylinder barrel (10) and a valve core assembly, wherein the valve core assembly is inserted into the cylinder barrel (10) and is slidably connected to the cylinder barrel (10); The valve core assembly comprises a first valve core (100) and a second valve core (200), wherein 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); 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 slidably connected to the first piston body (110); the first return spring (130) is used to apply 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 slidably connected to the second piston body (210); the second return spring (230) is used to apply 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 chamber (30) and the second chamber (40); the second valve core (200) is provided with a second passage, and the second passage is used to connect the first chamber (30) and the second chamber (40); When the valve core assembly moves toward the first chamber (30), the medium pressure in the first chamber (30) increases and overcomes the elastic force of the second return spring (230) to push the second sliding sleeve (220) to move, thereby connecting the second passage to communicate the first chamber (30) and the second chamber (40); When the valve core assembly moves toward the second chamber (40), the medium pressure in the second chamber (40) increases and overcomes the elastic force of the first return spring (130) to push the first sleeve (120) to move, thereby connecting the first passage to connect the first chamber (30) and the second chamber (40).

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

3. The bidirectional piston balancing valve structure according to claim 2 is characterized in that: The valve core assembly further comprises a first sealing ring (300), wherein the first sealing ring (300) is 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 toward the first chamber (30), the medium pressure in the first chamber (30) increases and causes the first sealing ring (300) to press against the second sliding sleeve (220), thereby cutting off the communication between the first chamber (30) and the second chamber (40); When the valve core assembly moves toward the second chamber (40), the medium pressure in the second chamber (40) increases and causes the first sealing ring (300) to press against the first sliding sleeve (120), thereby cutting off the connection between the first chamber (30) and the second chamber (40).

4. The bidirectional piston balancing valve structure according to claim 3 is characterized in that: The first valve core (100) further includes a second sealing ring (140), and the second valve core (200) further includes a third sealing ring (240); 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 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 communicating 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 into the second sliding sleeve (220); the two third sealing rings (240) are respectively arranged on both sides of the second radial hole (212) to cut off the connection between the second radial hole (212) and the second connecting hole (221); the third sealing ring (240) is installed on the second piston body (210) or the second sliding sleeve (220).

5. The bidirectional piston balancing valve structure according to claim 4 is characterized in that: The first valve core (100) further includes a first baffle (150), and the second valve core (200) further includes 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); The first baffle (150) is provided with a first through hole (151), and the first through hole (151) is used to connect the first cavity (30) and the first connecting hole (121); The second baffle (250) is provided with a second through hole (251), and the second through hole (251) is used to connect the second cavity (40) and the second connecting hole (221).

6. The bidirectional piston balancing valve structure according to claim 5, characterized in that: The first axial hole (111) is connected to the second axial hole (211), and a radial through hole is provided on the first piston body (110) and / or the second piston body (210), one end of the radial through hole is connected to the first annular groove (301), and the other end is connected to the first axial hole (111) and / or the second axial hole (211).

7. The bidirectional piston balancing valve structure according to claim 6, characterized in that: The valve core assembly further includes a piston rod (400), and the first valve core (100) and the second valve core (200) further include a fourth sealing ring (160); The piston rod (400) is inserted into a first baffle (150), a first piston body (110), a second piston body (210) and a second baffle (250) which are arranged in sequence; 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).

8. A gas spring, characterized in that: It comprises a bidirectional piston balancing valve structure as described in any one of claims 1-7.

9. The gas spring according to claim 8, characterized in that It also includes an isolation piston (50), wherein the isolation piston (50) is inserted into the cylinder barrel (10) and is slidably connected to the cylinder barrel (10); A rodless cavity is formed between the isolation piston (50) and the valve core assembly, an end of the valve core assembly away from the rodless cavity is a rod cavity, and an end of the isolation piston (50) away from the rodless cavity is a pressure cavity; The pressure chamber, the rod chamber and the rodless chamber are all filled with medium.

10. The gas spring according to claim 8, characterized in that The inner wall of the cylinder (10) is provided with a communication groove extending in the axial direction, and the communication groove is used to connect the first chamber (30) and the second chamber (40).

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