Piston balance valve structure and gas spring

Abstract

The utility model relates to the technical field of springs, in particular to a piston balance valve structure and a gas spring, and aims to solve the problem that a common gas spring cannot stay at any position. The piston balance valve structure comprises a cylinder barrel and a valve element, the valve element is inserted into the cylinder barrel, and a first cavity and a second cavity are formed in the two ends of the valve element respectively. The valve element comprises a piston body, a sliding sleeve and a reset spring. The sliding sleeve is sleeved on the piston body; the reset spring is used for applying elastic force to the sliding sleeve; the piston body is provided with a first passage, the sliding sleeve is provided with a second passage, the first passage is communicated with the first cavity, and the second passage is communicated with the second cavity. The valve element moves towards the first cavity to enable the first cavity and the second cavity to generate pressure difference so as to push the sliding sleeve, then the first channel and the second channel are communicated, the elastic force of the reset spring enables the first cavity and the second cavity to generate pressure difference and balance the elastic force, meanwhile, the pressure difference acts on the section of the cylinder barrel to balance loads, and residence at any position is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of springs, in particular to a piston balance valve structure and a gas spring. Background Art

[0002] An ordinary gas spring can only stop the lifted object at the end of the stroke, and cannot stop the lifted object at any position except the dead zone according to needs. When applied, it is impossible to stop structures such as doors at any angle, and the convenience of use is not good. Content of the Utility Model

[0003] The purpose of the utility model is to provide a piston balance valve structure and a gas spring to solve the problem that an ordinary gas spring cannot stay at any position.

[0004] In order to solve the above technical problems, the technical solution provided by the utility model is as follows:

[0005] A piston balance valve structure includes a cylinder barrel and a valve core. The valve core is inserted into the cylinder barrel and is slidably connected with the cylinder barrel. The two ends of the valve core are respectively a first chamber and a second chamber;

[0006] The valve core includes a piston body, a sliding sleeve and a return spring;

[0007] The sliding sleeve is sleeved on the piston body and is slidably connected with the piston body; the return spring is used to apply an elastic force to the sliding sleeve so that the sliding sleeve abuts against the piston body;

[0008] A first passage is arranged on the piston body, and a second passage is arranged on the sliding sleeve. The first passage is communicated with the first chamber, and the second passage is communicated with the second chamber;

[0009] When the valve core moves towards the first chamber, the medium pressure in the first chamber increases, thereby overcoming the elastic force of the return spring and pushing the sliding sleeve so that the first passage and the second passage are communicated.

[0010] Further, the valve core further includes a first retaining piece, one end of the return spring abuts against the first retaining piece, and the other end abuts against the sliding sleeve.

[0011] Further, the valve core further includes a first sealing ring. The first sealing ring is sleeved on the piston body and is inserted into the cylinder barrel, and the first sealing ring abuts against the cylinder barrel;

[0012] When the valve core moves towards the first chamber, the medium pressure presses the first sealing ring against the end face of the sliding sleeve so that the first sealing ring seals the annular gap between the piston body and the sliding sleeve and the annular gap between the sliding sleeve and the cylinder barrel.

[0013] Further, the spool valve further includes a second baffle, which is disposed on a side of the first sealing ring away from the sliding sleeve.

[0014] A through hole is formed in the second baffle to connect the first chamber and the first passage.

[0015] Further, the first passage includes a first radial hole, an axial hole, and a second radial hole that are sequentially communicated; the second passage includes a third radial hole;

[0016] The first radial hole is communicated with the first chamber, and the third radial hole is communicated with the second chamber;

[0017] The second radial hole is communicated with the third radial hole to connect the first passage and the second passage.

[0018] Further, the spool valve further includes a second sealing ring. Two second sealing rings are sleeved on the piston body and inserted into the sliding sleeve, and are respectively disposed on both sides of the second radial hole to cut off the communication state between the second radial hole and the third radial hole;

[0019] The second sealing ring is installed on the piston body or the sliding sleeve.

[0020] Further, the spool valve further includes a piston rod and a third sealing ring. The piston rod is inserted into the piston body and the first baffle;

[0021] The piston rod is disposed in the first chamber or the second chamber;

[0022] The third sealing ring is used to seal the annular gap between the piston rod and the piston body.

[0023] On the other hand, the present utility model provides a gas spring, which includes the above piston balance valve structure.

[0024] Further, the gas spring further includes an isolation piston, which is inserted into the cylinder barrel and is slidably connected to the cylinder barrel;

[0025] An oil-free chamber is formed between the isolation piston and the spool valve. One end of the spool valve away from the oil-free chamber is a rod chamber, and one end of the isolation piston away from the oil-free chamber is a pressure chamber;

[0026] Media are filled in the pressure chamber, the rod chamber, and the oil-free chamber.

[0027] Further, a communication groove extending axially is provided on the inner wall of the cylinder barrel, and the communication groove is used to connect the first chamber and the second chamber.

[0028] In summary of the above technical solutions, the technical effects achievable by the present utility model are as follows:

[0029] The piston balance valve structure provided by the present utility model includes a cylinder barrel and a valve core. The valve core is inserted into the cylinder barrel and is slidably connected to the cylinder barrel. The two ends of the valve core are respectively a first chamber and a second chamber. The valve core includes a piston body, a sliding sleeve, and a return spring. The sliding sleeve is sleeved on the piston body and is slidably connected to the piston body. The return spring is used to apply an elastic force to the sliding sleeve so that the sliding sleeve abuts against the piston body. A first passage is provided on the piston body, and a second passage is provided on the sliding sleeve. The first passage communicates with the first chamber, and the second passage communicates with the second chamber. When the valve core moves towards the first chamber, the medium pressure in the first chamber increases, thereby overcoming the elastic force of the return spring and pushing the sliding sleeve so that the first passage and the second passage communicate with each other.

[0030] When the valve core of the piston balance valve structure provided by the present utility model moves towards the first chamber, the space in the first chamber is compressed, causing the medium pressure to increase. Correspondingly, the space in the second chamber increases, causing the medium pressure to decrease, thereby forming a pressure difference. Under the action of the pressure difference, the sliding sleeve is pushed to slide in the direction of the second chamber and the return spring is compressed. At the same time, the first passage and the second passage are communicated. At this time, the first chamber and the second chamber are communicated, and the fluid pressure difference between the two chambers remains basically unchanged, and the resistance to the movement of the valve core remains basically unchanged. That is, the tendency of the return spring to push the sliding sleeve to move will cause a compression tendency of the space in the first chamber and an increasing tendency of the space in the second chamber, thereby generating a pressure difference between the first chamber and the second chamber. The pressure generated by this pressure difference on the sliding sleeve will balance the elastic force of the return spring to ensure that the sliding sleeve does not move, thereby realizing the dynamic balance of the elastic force and the pressure. At the same time, this pressure difference acts on the inner cross-section of the cylinder barrel to generate an external compressive force to counteract the load, thereby realizing staying at any position. This external compressive force is higher than the elastic force of the return spring, that is, the elastic force of the return spring is amplified through the same pressure difference and different acting areas. The piston balance valve structure provided by the present utility model can reliably realize the staying of the lifted object at any position except the dead zone during the stroke as a piston of a gas spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 It is a schematic structural diagram of the piston balance valve structure provided by an embodiment of the present utility model;

[0033] Figure 2 is Figure 1 a partial enlarged view of part A in

[0034] Figure 3 Schematic diagram of the valve core in the compressed state;

[0035] Figure 4 Another structural schematic diagram of the valve core;

[0036] Figure 5 Another structural schematic diagram of the valve core;

[0037] Figure 6 Schematic diagram of the structure of the gas spring.

[0038] Icons: 10, cylinder barrel; 20, valve core; 30, first chamber; 40, second chamber; 50, isolation piston; 100, piston body; 200, sliding sleeve; 300, return spring; 400, first retaining piece; 500, first sealing ring; 600, second retaining piece; 700, second sealing ring; 800, piston rod; 900, third sealing ring; 101, first radial hole; 102, axial hole; 103, second radial hole; 201, third radial hole; 601, through hole. Specific embodiments

[0039] In order to make the objectives, 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 with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the present invention claimed, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0041] The following will describe in detail some embodiments of the present invention with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0042] Ordinary gas springs can only stop the lifted object at the end of the stroke and cannot retain the lifted object at any position other than the closed dead zone as needed. When applied, it is impossible to stop structures such as doors at any angle, and the usability is poor.

[0043] In view of this, the present utility model provides a piston balance valve structure, which includes a cylinder barrel 10 and a valve core 20. The valve core 20 is inserted into the cylinder barrel 10 and is slidably connected to the cylinder barrel 10. The two ends of the valve core 20 are respectively a first chamber 30 and a second chamber 40. The valve core 20 includes a piston body 100, a sliding sleeve 200 and a return spring 300. The sliding sleeve 200 is sleeved on the piston body 100 and is slidably connected to the piston body 100. The return spring 300 is used to apply an elastic force to the sliding sleeve 200 so that the sliding sleeve 200 abuts against the piston body 100. A first passage is provided on the piston body 100, and a second passage is provided on the sliding sleeve 200. The first passage communicates with the first chamber 30, and the second passage communicates with the second chamber 40. When the valve core 20 moves towards the first chamber 30, the medium pressure in the first chamber 30 increases, thereby overcoming the elastic force of the return spring 300 and pushing the sliding sleeve 200 to connect the first passage and the second passage.

[0044] When the valve core 20 of the piston balance valve structure provided by the present utility model moves towards the first chamber 30, the space of the first chamber 30 is compressed, causing the medium pressure to increase. Correspondingly, the space of the second chamber 40 increases, causing the medium pressure to decrease, thereby forming a pressure difference. Under the action of the pressure difference, the sliding sleeve 200 is pushed to slide towards the second chamber 40 and compress the return spring 300. At the same time, the first passage and the second passage are connected. At this time, the first chamber 30 and the second chamber 40 are connected, and the fluid pressure difference between the two chambers remains basically unchanged, and the resistance to the movement of the valve core 20 remains basically unchanged. That is, the tendency of the return spring 300 to push the sliding sleeve 200 to move will cause a compression tendency of the space of the first chamber 30 and an increasing tendency of the space of the second chamber 40, thereby generating a pressure difference between the first chamber 30 and the second chamber 40. The pressure generated by this pressure difference on the sliding sleeve 200 will balance the elastic force of the return spring 300 to ensure that the position of the sliding sleeve 200 remains unchanged, thereby realizing the dynamic balance of the elastic force and the pressure. At the same time, this pressure difference acts on the inner cross-section of the cylinder barrel 10 to generate an external compressive force to counteract the load, thereby realizing staying at any position. This pressure is higher than the elastic force of the return spring 300, that is, the elastic force of the return spring 300 is amplified through the same pressure difference and different acting areas. The piston balance valve structure provided by the present utility model can reliably realize the staying of the lifted object at any position except the dead zone in the stroke as a piston of a gas spring.

[0045] The following combines Figures 1-6 to detail the structure and shape of the piston balance valve structure provided in this embodiment:

[0046] In an optional solution provided in this embodiment, the valve core 20 further includes a first retaining piece 400, a first sealing ring 500, a second retaining piece 600, a second sealing ring 700, a piston rod 800 and a third sealing ring 900, as Figure 2As shown. Specifically, the first baffle 400 and the second baffle 600 are arranged at both ends of the piston body 100, and the piston rod 800 is inserted into the first baffle 400, the piston body 100 and the second baffle 600; there is a step on the piston rod 800, one end of the first baffle 400 abuts against the step, and the other end abuts against the end of the return spring 300 away from the sliding sleeve 200; the second baffle 600 is connected to the piston rod 800 to fix the piston body 100 and the first baffle 400 on the piston rod 800. Among them, the second baffle 600 and the piston rod 800 can be connected by means such as threaded connection, welding, and crimping.

[0047] In this embodiment, the first sealing ring 500 is sleeved on the piston body 100 and inserted into the cylinder barrel 10. The outer circle of the first sealing ring 500 abuts against the cylinder barrel 10 and is located at the end of the sliding sleeve 200 away from the return spring. That is, the second baffle 600, the piston body 100 and the sliding sleeve 200 enclose an annular groove to accommodate the first sealing ring 500.

[0048] In this embodiment, the first passage includes a first radial hole 101, an axial hole 102 and a second radial hole 103 that are connected in sequence; the second passage includes a third radial hole 201; a through hole 601 is opened on the second baffle 600 to connect the first chamber 30 and the first passage, as Figure 2 shown. Specifically, the first radial hole 101 is communicated with the through hole 601, the through hole 601 is communicated with the first chamber 30, and the third radial hole 201 is communicated with the second chamber 40. The second radial hole 103 and the third radial hole 201 are communicated through the annular gap between the sliding sleeve 200 and the piston body 100. To improve the communication efficiency, a communication groove can be opened on the inner wall of the sliding sleeve 200 to increase the flow cross-sectional area of the annular gap.

[0049] In this embodiment, two second sealing rings 700 are sleeved on the piston body 100 and inserted into the sliding sleeve 200, and are respectively arranged on both sides of the second radial hole 103 to cut off the communication state between the second radial hole 103 and the third radial hole 201. Specifically, as Figure 2 shown, an annular groove is opened on the inner wall of the sliding sleeve 200 for installing the second sealing ring 700, and the second sealing ring 700 moves with the sliding sleeve 200.

[0050] In an alternative solution of this embodiment, the second sealing ring 700 can be installed on the piston body 100. An annular groove is opened on the outer wall of the piston body 100 for installing the second sealing ring 700, and the second sealing ring 700 does not move with the sliding sleeve 200, as Figure 4 shown.

[0051] In this embodiment, an annular groove is provided at the end of the piston body 100 that abuts against the first baffle 400, and the third sealing ring 900 is installed in the annular groove to seal the gap between the piston body 100 and the piston rod 800.

[0052] When the valve core 20 moves towards the first chamber 30, the medium pressure presses the first sealing ring 500 against the end face of the sliding sleeve 200 so that the first sealing ring 500 seals the annular gap between the piston body 100 and the sliding sleeve 200.

[0053] In this embodiment, the piston rod 800 can be arranged in the first chamber 30 as Figure 5 shown. At this time, the first chamber 30 is the rod chamber and the gas spring is in compression balance; it can also be arranged in the second chamber 40, as Figure 2 shown. At this time, the second chamber 40 is the rod chamber and the gas spring is in tension balance.

[0054] In this embodiment, the first sealing ring 500, the second sealing ring 700 and the third sealing ring 900 can all be selected as O-rings.

[0055] In this embodiment, the return spring 300 can be set as a tension spring, that is, one end of the return spring 300 is connected to the second retaining piece 600 and the other end is connected to the sliding sleeve 200.

[0056] The working process of the piston balance valve structure provided in this embodiment is as follows:

[0057] Taking the piston rod 800 arranged in the second chamber 40 as an example for illustration, as Figure 2 shown. In the initial state, the first chamber 30 and the second chamber 40 are communicated through the annular gap between the cylinder barrel 10 and the valve core 20 to achieve pressure balance between the two.

[0058] When an external force is applied to push the piston rod 800 to move the valve core 20 towards the first chamber 30, that is, when the rodless chamber is compressed, the first sealing ring 500 remains stationary under the frictional resistance of the inner wall of the cylinder barrel 10 and thus approaches the end of the sliding sleeve 200. The first sealing ring 500 presses the sliding sleeve 200 and seals the annular gaps between the sliding sleeve 200 and the cylinder barrel 10, and between the sliding sleeve 200 and the piston body 100. Thus, the first chamber 30 and the second chamber 40 are separated by the valve core 20 and the two chambers are no longer communicated. As the space of the first chamber 30 decreases and the space of the second chamber 40 increases, a pressure difference is generated.

[0059] As the pressure difference increases, the first sealing ring 500 pushes the sliding sleeve 200 to move to the right to compress the return spring 300. At this time, the second sealing ring 700 moves with the sliding sleeve 200. As the second sealing ring 700 on the sliding sleeve 200 passes over the second radial hole 103, the second radial hole 103 is communicated with the third radial hole 201, as Figure 3As shown. The media in the first chamber 30 and the second chamber 40 are connected through the through hole 601, the first radial hole 101, the axial hole 102, the second radial hole 103 and the third radial hole 201 which are connected in sequence. The pressure difference between the two chambers of the fluid remains basically unchanged, and the resistance to the movement of the valve core 20 remains basically unchanged. The return spring 300 generates a tendency to push the sliding sleeve 200 to move to the left. This tendency 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 sliding sleeve 200 and balances with the elastic force of the return spring 300 to prevent the connection between the first chamber 30 and the second chamber 40 from being cut off due to the reset of the sliding sleeve 200.

[0060] At the same time, this pressure difference acts on the inner cross-section of the cylinder barrel 10 to generate an external compressive force, so as to balance with the load and produce the effect of staying at any position. After the valve core 20 moves to the required position, removing the external force to stop pushing the valve core 20 can achieve stopping at any position.

[0061] Based on the piston balance valve structure provided in this embodiment, a gas spring is proposed, as Figure 6 shown, including the above-mentioned piston balance valve structure, and also including an isolation piston 50. The isolation piston 50 is inserted into the cylinder barrel 10 and is slidably connected to the cylinder barrel 10. Specifically, the space between the isolation piston 50 and the valve core 20 is the rodless chamber, the end of the valve core 20 away from the rodless chamber is the rod chamber, and the end of the isolation piston 50 away from the rodless chamber is the pressure chamber, as Figure 1 shown. The pressure chamber, the rod chamber and the rodless chamber are all filled with media, such as nitrogen, oil-gas mixture, hydraulic oil, etc. Among them, the media in the rod chamber and the rodless chamber are the same.

[0062] In this embodiment, a communication groove extending axially is provided on the inner wall of the cylinder barrel 10. The communication groove is used to connect the first chamber 30 and the second chamber 40. When the valve core 20 is located at the communication groove, the sliding sleeve 200 will not be pushed alone, and the first chamber 30 and the second chamber 40 cannot be cut off by the valve core 20. The gas spring generates a thrust through the cross-sectional area difference between the rod chamber and the rodless chamber. Specifically, multiple sections of communication grooves can be arranged at intervals along the axial direction of the cylinder barrel 10 to realize the segmented opening of the gas spring. At this time, the piston rod 800 can move a certain distance by itself in the section covered by the communication groove. After leaving the area covered by the communication groove, the piston balance valve structure takes effect and the valve core 20 stops moving. If you want to continue moving, additional force is required, so as to achieve segmented stopping.

[0063] 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 them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and 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 piston balance valve structure, characterized in that: It comprises a cylinder (10) and a valve core (20), wherein the valve core (20) is inserted into the cylinder (10) and is slidably connected to the cylinder (10), and the two ends of the valve core (20) are respectively a first cavity (30) and a second cavity (40); The valve core (20) comprises a piston body (100), a sliding sleeve (200) and a return spring (300); The sliding sleeve (200) is sleeved on the piston body (100) and is slidably connected to the piston body (100); the return spring (300) is used to apply elastic force to the sliding sleeve (200) so that the sliding sleeve (200) abuts against the piston body (100); The piston body (100) is provided with a first passage, the sliding sleeve (200) is provided with a second passage, the first passage is communicated with the first chamber (30), and the second passage is communicated with the second chamber (40); When the valve core (20) moves toward the first chamber (30), the medium pressure in the first chamber (30) increases, thereby overcoming the elastic force of the return spring (300) and pushing the sliding sleeve (200) to connect the first passage and the second passage.

2. The piston balance valve structure according to claim 1, characterized in that: The valve core (20) further comprises a first baffle (400), one end of the return spring (300) abuts against the first baffle (400), and the other end abuts against the sliding sleeve (200).

3. The piston balance valve structure according to claim 2, characterized in that: The valve core (20) further comprises a first sealing ring (500), wherein the first sealing ring (500) is sleeved on the piston body (100) and inserted into the cylinder barrel (10), and the first sealing ring (500) abuts against the cylinder barrel (10); When the valve core (20) moves toward the first chamber (30), the medium pressure presses the first sealing ring (500) against the end surface of the sliding sleeve (200) so that the first sealing ring (500) seals the annular gap between the piston body (100) and the sliding sleeve (200) and the annular gap between the sliding sleeve (200) and the cylinder barrel (10).

4. The piston balance valve structure according to claim 3, characterized in that: The valve core (20) further comprises a second baffle (600), wherein the second baffle (600) is arranged on a side of the first sealing ring (500) away from the sliding sleeve (200). The second baffle (600) is provided with a through hole (601) for connecting the first cavity (30) and the first passage.

5. The piston balance valve structure according to claim 4, characterized in that: The first passage comprises a first radial hole (101), an axial hole (102) and a second radial hole (103) which are connected in sequence; the second passage comprises a third radial hole (201); The first radial hole (101) is in communication with the first cavity (30), and the third radial hole (201) is in communication with the second cavity (40); The second radial hole (103) is in communication with the third radial hole (201) so that the first passage is in communication with the second passage.

6. The piston balance valve structure according to claim 5, characterized in that: The valve core (20) further comprises a second sealing ring (700), wherein two second sealing rings (700) are sleeved on the piston body (100) and inserted into the sliding sleeve (200), and are respectively arranged on both sides of the second radial hole (103) to cut off the communication between the second radial hole (103) and the third radial hole (201); The second sealing ring (700) is installed on the piston body (100) or the sliding sleeve (200).

7. The piston balance valve structure according to claim 6, characterized in that: The valve core (20) further comprises a piston rod (800) and a third sealing ring (900), wherein the piston rod (800) is inserted into the piston body (100) and the first baffle (400); The piston rod (800) is disposed in the first chamber (30) or the second chamber (40); The third sealing ring (900) is used to seal the annular gap between the piston rod (800) and the piston body (100).

8. A gas spring, characterized in that: It comprises a piston balancing valve structure as described in any one of claims 1 to 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 (20), an end of the valve core (20) 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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