A bidirectional controllable airless lockable gas spring

Abstract

The present invention relates to a bidirectional controllable airless lockable gas spring, which comprises a cylinder, a left piston rod, a right piston rod, a valve seat, a valve core and an ejector pin. The valve seat is movably arranged in the cylinder and is used to isolate the cylinder into a left chamber and a right chamber. The outer wall of the valve seat is sealed and matched with the inner wall of the cylinder. The two ends of the valve seat are respectively fixedly connected with one end of the left piston rod and the right piston rod. The other ends of the left piston rod and the right piston rod extend out of the cylinder. A movable valve core is arranged at the center of the valve seat. The ejector pin comprises an ejector rod body and an ejector ball head fixedly arranged at the end of the ejector rod body. The left piston rod or the right piston rod is provided with a rod body accommodating cavity suitable for the ejector rod body to pass through and a ball head accommodating cavity suitable for the ejector ball head to move, so that the ejector ball head is placed in the ball head accommodating cavity and cooperates with the valve core for transmission. The end of the ejector rod body extends out of the left piston rod or the right piston rod.

Description

Technical Field

[0001] The invention relates to the technical field of gas springs, in particular to a bidirectional controllable airless lockable gas spring. Background Art

[0002] Gas springs have a wide range of uses. The working principle of a gas spring is to fill an inert gas or an oil-gas mixture into a closed pressure cylinder to make the pressure in the cavity many times higher than the atmospheric pressure. The movement of the piston rod is achieved by using the pressure difference generated by the cross-sectional area of ​​the piston rod being smaller than the cross-sectional area of ​​the piston. A gas spring is an industrial accessory that can perform functions such as support, cushioning, braking, height adjustment, and angle adjustment. In the fields of automobiles, aviation, medical equipment, furniture, and machinery manufacturing, the gas springs currently used often use an extension head, but in some occasions they cannot meet the use requirements and require multiple gas springs to be used together, which increases costs and is inconvenient to maintain. Therefore, it has limitations in some fields. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a bidirectional controllable airless lockable gas spring with bidirectional travel and no need to be filled with nitrogen.

[0004] In order to solve the above technical problems, the present invention provides a two-way controllable airless lockable gas spring, comprising a cylinder, a left piston rod, a right piston rod, a valve seat, a valve core and an ejector pin. The valve seat is movably arranged in the cylinder to isolate the cylinder into a left chamber and a right chamber. The outer wall of the valve seat is sealed with the inner wall of the cylinder. The two ends of the valve seat are respectively fixedly connected to one end of the left piston rod and the right piston rod. The other ends of the left piston rod and the right piston rod extend out of the cylinder. A movable valve core is arranged in the center of the valve seat. The ejector pin comprises an ejector rod body and an ejector ball head fixedly arranged at the end of the ejector rod body. The left piston rod or the right piston rod is provided with a rod body accommodating chamber suitable for the ejector rod body to pass through and a ball head accommodating chamber suitable for the ejector ball head to move, so that the ejector ball head is placed in the ball head accommodating chamber and cooperates with the valve core transmission, and the end of the ejector rod body extends out of the left piston rod or the right piston rod. When in use, the ejector is pushed to open the valve core, the left chamber and the right chamber are connected, the oil flows between the left chamber and the right chamber, the left piston rod, the right piston rod and the cylinder barrel move relative to each other, and when the thrust on the ejector is removed and the valve core is closed, the left chamber and the right chamber are no longer connected, and the left piston rod, the right piston rod and the cylinder barrel remain locked.

[0005] Furthermore, a valve seat ring platform is provided in the middle of the valve seat protruding circumferentially, a U-shaped groove is provided on the outer wall of the valve seat ring platform, and a sealing ring is provided in the U-shaped groove so that the valve seat is sealed and isolated by the sealing ring when placed in the cylinder.

[0006] Further, a right cylinder body of the valve seat and a left cylinder body of the valve seat are respectively arranged at two ends of the valve seat, a left piston rod installation chamber, a valve core moving chamber, and a first sealing ring installation chamber are arranged in sequence in the left cylinder body of the valve seat, a right piston rod installation chamber and an oil passage chamber are arranged in sequence in the right cylinder body of the valve seat, the first sealing ring installation chamber is communicated with the oil passage chamber, a left oil passage hole is radially arranged on the upper surface of the left valve core moving chamber, a right oil passage hole is radially arranged on the oil passage chamber, a first sealing ring is arranged in the first sealing ring installation chamber, the valve core comprises a transmission section, a valve core sealing section which is interference fit with the first sealing ring, and a valve core oil passage section which is clearance fit with the first sealing ring, during assembly, the transmission section extends into the ball head accommodating chamber and abuts against the ejector ball head, the first sealing ring is sleeved on the valve core sealing section to isolate the left piston rod installation chamber from the oil passage chamber, and when the ejector is pushed to make the valve core move until the first sealing ring is sleeved on the valve core oil passage section, the left piston rod installation chamber is communicated with the oil passage chamber, that is, the left chamber is communicated with the right chamber.

[0007] Furthermore, a first sealing ring installation groove is circumferentially arranged in the first sealing ring installation cavity, and the outer ring portion of the first sealing ring is placed in the first sealing ring installation groove for axially limiting the first sealing ring.

[0008] Furthermore, a piston rod clamping end is provided at the front end of the left piston rod and the right piston rod, and a sealing ring installation groove is provided on the outer wall of the piston rod clamping end. When the piston rod clamping ends of the left piston rod and the right piston rod are embedded in the corresponding left piston rod installation cavity and the right piston rod installation cavity, a sealing ring is provided in the sealing ring installation groove.

[0009] Furthermore, a second sealing ring installation cavity is also provided in the front part of the ball head accommodating cavity, and a second sealing ring which is interference fit with the transmission section is provided in the second sealing ring installation cavity, so that when the transmission section of the valve core passes through the second sealing ring installation cavity and enters the ball head accommodating cavity, the transmission section is sealed by the second sealing ring.

[0010] Furthermore, a second sealing ring installation groove is circumferentially arranged in the second sealing ring installation cavity, and the outer ring portion of the second sealing ring is placed in the second sealing ring installation groove.

[0011] Furthermore, the bidirectional controllable airless lockable gas spring also includes a left end cover and a right end cover placed at both ends of the cylinder barrel, a left plug is arranged on the inner side of the left end cover, and a right plug is arranged on the inner side of the right end cover, the left piston rod passes through the left plug and extends out of the left end cover, and the right piston rod passes through the right plug and extends out of the right end cover.

[0012] Furthermore, the bidirectional controllable airless lockable gas spring also includes a left gasket and a right gasket. The left gasket is sleeved on the left piston rod and placed between the left plug and the valve seat, and the right gasket is sleeved on the right piston rod and placed between the right plug and the valve seat to prevent the valve seat from contacting the left plug and the right plug when it moves to the left and right ends, thereby causing damage to the valve seat.

[0013] Furthermore, the bidirectional controllable airless lockable gas spring also includes a retaining ring, which is fixedly arranged in the valve core moving cavity, and a valve core end cover is arranged at the tail end of the valve core sealing section, and the outer diameter of the valve core end cover is larger than the inner diameter of the retaining ring and larger than the outer diameter of the valve core sealing section, so that when the valve core sealing section passes through the retaining ring and extends into the oil passage cavity, the valve core is axially limited by the valve core end cover.

[0014] Furthermore, the end of the ejector ball head is provided with a ball head plane for abutting against the transmission section, so that the ejector ball head and the valve core are in plane contact, the transmission is more stable, and curved surface contact is avoided.

[0015] Technical effects of the invention: (1) Compared with the prior art, the bidirectional controllable airless lockable gas spring of the present invention has a structure in which a left piston rod and a right piston rod are arranged at both ends of the valve seat, a movable valve core is arranged between the left chamber and the right chamber, and the movement of the valve core is controlled by a pin, so that when the oil-passing section of the valve core is at the first sealing ring, the left chamber and the right chamber are connected, and the oil in the left chamber and the right chamber can flow. By applying an external force, the mutual movement between the cylinder barrel and the left piston rod and the right piston rod can be completed. When the sealing section of the valve core is at the first sealing ring, a sealed isolation is formed, and the circulation of the oil between the left chamber and the right chamber is blocked by the valve core and the first sealing ring, so that the left piston rod, the right piston rod and the cylinder barrel are in a state of being closed. Relative static state; (2) The second sealing ring is set to isolate the oil chamber and the ball head accommodating chamber to prevent oil from overflowing from the piston rod body; (3) A ball head plane is set at the end of the ejector ball head, so that the ejector can easily abut the end of the valve core transmission section; (4) The diameter of the valve core end cover is larger than the outer diameter of the valve core sealing section, so that when the external force pushing the ejector is removed, the pressure of the oil acting on the valve core end cover drives the valve core to reset, thereby isolating the left chamber and the right chamber; (5) The two chambers of the two-way controllable airless lockable gas spring are directly filled with oil, without the need to fill with nitrogen. When in use, the parts that need to be moved are fixedly connected to the cylinder, and the left piston rod and the right piston rod are connected to the parts that remain stationary. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0017] Figure 1 It is a schematic cross-sectional structure diagram of a bidirectional controllable airless lockable gas spring of the present invention;

[0018] Figure 2is a schematic diagram of the cross-sectional structure of the valve seat of the present invention;

[0019] Figure 3 It is a schematic diagram of the cross-sectional structure of the valve core of the present invention;

[0020] Figure 4 is a schematic cross-sectional structure diagram of the right piston rod of the present invention;

[0021] Figure 5 It is a schematic diagram of the cross-sectional structure of the ejector pin of the present invention.

[0022] In the figure:

[0023] Cylinder 1, left chamber 11, right chamber 12, left gasket 13, right gasket 14, first sealing ring 15, second sealing ring 16, retaining ring 17,

[0024] Valve seat 2, U-shaped groove 20, valve seat ring 21, valve seat right cylinder 22, valve seat left cylinder 23, oil passage chamber 24, right piston rod installation chamber 25, right oil passage hole 26, first sealing ring installation chamber 27, valve core moving chamber 28, left piston rod installation chamber 29, left oil passage hole 30,

[0025] Valve core 3, valve core sealing section 31, valve core oil passage section 32, valve core end cover 33, conical transition section 34, transmission section 35,

[0026] Ejector 4, ejector rod 41, ejector ball head 42, ball head plane 43,

[0027] Right piston rod 5, piston rod body 51, rod body accommodating chamber 52, ball head accommodating chamber 53, second sealing ring installation chamber 54, piston rod clamping end 55, sealing ring installation groove 56, chamfered portion 57,

[0028] Left piston rod 6, left end cover 61, left plug 62, right end cover 63, right plug 64. DETAILED DESCRIPTION

[0029] Example 1 Figure 1 As shown, the bidirectional controllable airless lockable gas spring of this embodiment includes a cylinder 1, a left piston rod 6, a right piston rod 5, a valve seat 2, a valve core 3 and a ejector pin 4. The valve seat 2 is movably arranged in the cylinder 1 to isolate the cylinder 1 into a left chamber 11 and a right chamber 12. The left chamber 11 and the right chamber 12 are filled with oil.

[0030] like Figure 2 As shown, a valve seat ring platform 21 is provided in the middle of the valve seat 2 along the circumferential direction, a U-shaped groove 20 is provided on the outer wall of the valve seat ring platform 21, and a sealing ring is provided in the U-shaped groove 20, so that when the valve seat 2 is placed in the cylinder 1, it is sealed and isolated by the sealing ring to prevent the oil between the left chamber 11 and the right chamber 12 from flowing between the valve seat 2 and the inner wall of the cylinder 1.

[0031] A right valve seat cylinder 22 and a left valve seat cylinder 23 are respectively arranged at both ends of the valve seat 2. A cylindrical left piston rod installation chamber 29, a valve core moving chamber 28 and a first sealing ring installation chamber 27 are arranged in sequence in the left valve seat cylinder 23. The diameters of the left piston rod installation chamber 29, the valve core moving chamber 28 and the first sealing ring installation chamber 27 decrease in sequence. A right piston rod installation chamber 25 and an oil passage chamber 24 are arranged in sequence in the right valve seat cylinder 22. The diameter of the oil passage chamber 24 is smaller than that of the right piston rod installation chamber 25. The first sealing ring installation chamber 27 is communicated with the oil passage chamber 24. A left oil passage hole 30 is radially arranged on the valve core moving chamber 28, and a right oil passage hole 26 is radially arranged on the oil passage chamber 24.

[0032] The first sealing ring 15 is arranged in the first sealing ring installation cavity 27. Figure 3 As shown, the valve core 3 includes a transmission section 35 , a valve core oil passing section 32 which is clearance-fitted with the first sealing ring 15 , and a valve core sealing section 31 which is interference-fitted with the first sealing ring 15 .

[0033] like Figure 5 As shown, the ejector pin 4 includes an ejector pin rod body 41 and an ejector pin ball head 42 fixedly arranged at the end of the ejector pin rod body 41. Figure 4 The piston rod body 51 of the right piston rod 5 shown (it can also be the piston rod body of the left piston rod 6 in other embodiments) is provided with a rod body accommodating chamber 52 suitable for the ejector rod body 41 to pass through and a ball head accommodating chamber 43 suitable for the ejector ball head 42 to move. A second sealing ring installation chamber 54 is also provided in the front part of the ball head accommodating chamber 52, and a second sealing ring 16 that is interference fit with the transmission section 35 is provided in the second sealing ring installation chamber 54.

[0034] The bidirectional controllable airless lockable gas spring also includes a retaining ring 17, which is fixedly arranged in the valve core moving chamber 28. A valve core end cover 33 is arranged at the tail end of the valve core sealing section 31. The outer diameter of the valve core end cover 33 is larger than the inner diameter of the retaining ring 17 and larger than the outer diameter of the valve core sealing section 31. The end of the ejector ball head 42 is provided with a ball head plane 43 for abutting against the transmission section 35.

[0035] During assembly, the transmission section 35 extends into the ball head accommodating chamber 53 and abuts against the ejector ball head 42, so that the ejector ball head 42 is placed in the ball head accommodating chamber 53 and cooperates with the valve core 3 in transmission. The end of the ejector rod body 41 extends out of the right piston rod 5, and the first sealing ring 15 is sleeved on the valve core sealing section 31 to isolate the left piston rod installation chamber 29 and the oil passage chamber 24. When the valve core sealing section 31 passes through the retaining ring 17 and extends into the oil passage chamber 24, the valve core 3 is axially limited by the valve core end cover 33; when the transmission section 35 of the valve core 3 passes through the second sealing ring installation chamber 54 and enters the ball head accommodating chamber 53, the transmission section 35 is sealed by the second sealing ring 16; the two ends of the valve seat 2 are respectively fixedly connected to one end of the left piston rod 6 and the right piston rod 5, and the other ends of the left piston rod 6 and the right piston rod 5 extend out of the cylinder 1.

[0036] When in use, the ejector pin 4 is pushed to open the valve core 3, the left chamber 11 and the right chamber 12 are connected, the oil flows between the left chamber 11 and the right chamber 12, and the left piston rod 6, the right piston rod 5 and the cylinder 1 move relative to each other. When the thrust on the ejector pin 4 is removed and the valve core 3 is closed, the left chamber 11 and the right chamber 12 are no longer connected, and the left piston rod 6, the right piston rod 5 and the cylinder 1 remain locked.

[0037] The bidirectional controllable airless lockable gas spring also includes a left end cover 61 and a right end cover 63 placed at both ends of the cylinder 1. A left plug 62 is arranged on the inner side of the left end cover 61, and a right plug 64 is arranged on the inner side of the right end cover 63. When the left piston rod 6 extends out of the left end cover 61, it is sealed by the left plug 62. When the right piston rod 5 extends out of the right end cover 63, it is sealed by the right plug 64.

[0038] In order to prevent the valve seat 2 from contacting the left plug 62 and the right plug 64 when it moves to the left and right ends in the cylinder 1, the bidirectional controllable airless lockable gas spring also includes a left gasket 13 and a right gasket 14. The left gasket 13 is sleeved on the left piston rod 6 and placed between the left plug 62 and the valve seat 2, and the right gasket 14 is sleeved on the right piston rod 5 and placed between the right plug 64 and the valve seat 2.

[0039] Preferably, a first sealing ring installation groove is circumferentially arranged in the first sealing ring installation cavity 27, and the outer ring portion of the first sealing ring 15 is placed in the first sealing ring installation groove for axially limiting the first sealing ring 15; a second sealing ring installation groove is circumferentially arranged in the second sealing ring installation cavity 54, and the outer ring portion of the second sealing ring 16 is placed in the second sealing ring installation groove.

[0040] Preferably, the front ends of the left piston rod 6 and the right piston rod 5 are provided with piston rod clamping ends 55, and the outer wall of the piston rod clamping ends 55 is provided with sealing ring installation grooves 56. When the piston rod clamping ends 55 of the left piston rod 6 and the right piston rod 5 are inserted into the corresponding left piston rod installation cavity 29 and the right piston rod installation cavity 25, a sealing ring is provided in the sealing ring installation groove 56. In order to facilitate the assembly of the left piston rod 6 with the left piston rod installation cavity 29 and the right piston rod 5 with the right piston rod installation cavity 25, a chamfered portion 57 is provided at the front end of the piston rod clamping end 55.

[0041] Preferably, a conical transition portion 34 is provided at the connection between the valve core oil passage section 32 and the valve core sealing section 31 , so that a conical transition is formed between the valve core oil passage section 32 and the valve core sealing section 31 , which facilitates the sliding of the valve core 3 .

[0042] Obviously, the above embodiments are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, these obvious changes or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims

1. A bidirectional controllable airless lockable gas spring, characterized in that: The invention comprises a cylinder, a left piston rod, a right piston rod, a valve seat, a valve core and an ejector pin. The valve seat is movably arranged in the cylinder and is used to separate the cylinder into a left chamber and a right chamber. The outer wall of the valve seat is sealed with the inner wall of the cylinder. The two ends of the valve seat are respectively fixedly connected with one end of the left piston rod and the right piston rod. The other ends of the left piston rod and the right piston rod extend out of the cylinder. A movable valve core is arranged in the center of the valve seat. The ejector pin comprises an ejector pin rod body and an ejector pin ball head fixedly arranged at the end of the ejector pin rod body. The left piston rod or the right piston rod is provided with a suitable The rod body accommodating cavity through which the ejector rod body passes and the ball head accommodating cavity suitable for the ejector ball head to move, so that the ejector ball head is placed in the ball head accommodating cavity and cooperates with the valve core transmission, the end of the ejector rod body extends out of the left piston rod or the right piston rod, and when in use, the ejector is pushed to open the valve core, the left chamber and the right chamber are connected, the oil flows between the left chamber and the right chamber, the left piston rod, the right piston rod and the cylinder barrel move relative to each other, and when the thrust on the ejector is removed and the valve core is closed, the left chamber and the right chamber are no longer connected, and the left piston rod, the right piston rod and the cylinder barrel remain locked; A valve seat ring platform is provided in the middle of the valve seat protruding along the circumferential direction, a U-shaped groove is provided on the outer wall of the valve seat ring platform, and a sealing ring is provided in the U-shaped groove; A right cylinder body of the valve seat and a left cylinder body of the valve seat are respectively arranged at two ends of the valve seat, a left piston rod installation chamber, a valve core moving chamber, and a first sealing ring installation chamber are sequentially arranged in the left cylinder body of the valve seat, a right piston rod installation chamber and an oil passage chamber are sequentially arranged in the right cylinder body of the valve seat, the first sealing ring installation chamber is communicated with the oil passage chamber, a left oil passage hole is radially arranged on the valve core moving chamber in the left cylinder body of the valve seat, a right oil passage hole is radially arranged in the oil passage chamber, a first sealing ring is arranged in the first sealing ring installation chamber, the valve core comprises a transmission section, a valve core sealing section with an interference fit with the first sealing ring, and a valve core oil passage section with a clearance fit with the first sealing ring, during assembly, the transmission section extends into the ball head accommodating chamber and abuts against the ejector ball head, the first sealing ring is sleeved on the valve core sealing section to isolate the left piston rod installation chamber from the oil passage chamber, and when the ejector is pushed so that the valve core moves until the first sealing ring is sleeved on the valve core oil passage section, the left piston rod installation chamber is communicated with the oil passage chamber; The end of the ejector ball head is provided with a ball head plane for abutting against the transmission section, so that the ejector ball head is in plane contact with the valve core.

2. The bidirectional controllable airless lockable gas spring according to claim 1, characterized in that: A first sealing ring installation groove is circumferentially arranged in the first sealing ring installation cavity, and the outer ring portion of the first sealing ring is placed in the first sealing ring installation groove.

3. The bidirectional controllable airless lockable gas spring according to claim 2, characterized in that: The front ends of the left piston rod and the right piston rod are provided with piston rod clamping ends, and the outer walls of the piston rod clamping ends are provided with sealing ring installation grooves. When the piston rod clamping ends of the left piston rod and the right piston rod are embedded in the corresponding left piston rod installation cavities and the right piston rod installation cavities, sealing rings are provided in the sealing ring installation grooves.

4. The bidirectional controllable airless lockable gas spring according to claim 3, characterized in that: A second sealing ring installation cavity is also provided at the front of the ball head accommodating cavity, and a second sealing ring which is interference fit with the transmission section is provided in the second sealing ring installation cavity, so that when the transmission section of the valve core passes through the second sealing ring installation cavity and enters the ball head accommodating cavity, the transmission section is sealed by the second sealing ring.

5. The bidirectional controllable airless lockable gas spring according to claim 4, characterized in that: A second sealing ring installation groove is circumferentially arranged in the second sealing ring installation cavity, and the outer ring portion of the second sealing ring is placed in the second sealing ring installation groove.

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