Low temperature environment adaptive gas spring with phase change compensation mechanism

Abstract

The application provides a low-temperature environment adaptive gas spring with a phase change compensation mechanism, and belongs to the technical field of phase change compensation of gas springs.The low-temperature environment adaptive gas spring comprises a cylinder, a piston rod is arranged in the cylinder, a sealing guide is further arranged in the interior of the cylinder, a temperature control valve is further arranged in the interior of the cylinder, and the temperature control valve divides the cylinder into a first gas cavity and a second gas cavity.The application solves the problem that in the process of converting the use environment of the existing gas spring from a normal temperature state to a low-temperature state, the volume of the gas in the cavity will shrink, the pressure will suddenly drop, the supporting force will be insufficient, the action will be stuck, and the gas spring will completely fail in an extreme environment of-40 DEG C to-30 DEG C;furthermore, the traditional low-temperature compensation scheme depends on electric heating or a complex temperature control system, the cost is high, the maintenance is difficult, and when the gas spring is used in a low-temperature environment, the material of the sealing ring made of rubber will become brittle, external high-frequency vibration will cause the valve core in the gas spring to frequently resonate, and finally the sealing ring and the valve core will be excessively worn to cause sealing failure.

Description

Technical Field

[0001] The present invention belongs to the technical field of phase change compensation of gas springs, and in particular relates to a low-temperature environment adaptive gas spring with a phase change compensation mechanism. Background Art

[0002] Gas springs are accessories that provide support, cushioning, braking, height adjustment, and angle adjustment, and are widely used in medical equipment, automobiles, furniture, and machinery manufacturing. The principle is to fill a sealed cylinder with an inert gas or oil-gas mixture, raising the pressure inside the chamber to several or even dozens of times higher than atmospheric pressure. The piston rod's movement is achieved by utilizing the pressure difference created by the smaller cross-sectional area of ​​the piston rod than the piston.

[0003] When the operating environment of existing gas springs transitions from normal temperature to low temperature, the volume of gas in the cavity will shrink, causing a sudden drop in pressure, resulting in insufficient support force and stuck movement, and completely failing in extreme environments of -40℃~-30℃. In addition, traditional low-temperature compensation solutions rely on electric heating or complex temperature control systems, which are costly and difficult to maintain. At the same time, when used in normal temperature environments, friction will not affect the undeformed sealing ring. However, when used in low temperature environments, the rubber sealing ring material will become brittle, and external high-frequency vibrations will also cause the valve core in the gas spring to resonate frequently, eventually leading to excessive wear of the sealing ring and the valve core, resulting in sealing failure. Summary of the Invention

[0004] The present invention provides a low-temperature environment adaptive gas spring with a phase change compensation mechanism, which aims to solve the problem that when the use environment of the existing gas spring is converted from normal temperature to low temperature, the volume of the gas in the cavity will shrink, resulting in a sudden drop in pressure, causing insufficient support force and stuck movement, and completely failing in extreme environments of -40℃~-30℃. In addition, traditional low-temperature compensation solutions rely on electric heating or complex temperature control systems, which are costly and difficult to maintain. At the same time, when used in a normal temperature environment, friction will not affect the unmodified sealing ring. However, when used in a low temperature environment, the rubber sealing ring material will become brittle, and external high-frequency vibrations will also cause the valve core in the gas spring to resonate frequently, eventually leading to excessive wear of the sealing ring and the valve core, resulting in sealing failure.

[0005] An embodiment of the present invention provides a low-temperature environment adaptive gas spring with a phase change compensation mechanism, including a cylinder, a piston rod is provided in the cylinder, a sealing guide is also provided inside the cylinder, and a temperature control valve is also provided inside the cylinder, which divides the cylinder into a first air cavity and a second air cavity.

[0006] Furthermore, the sealing guide includes a sealing channel provided in an annular manner on the inner wall surface of the cylinder, the piston rod is slidably arranged in the sealing channel, and a pushing portion is fixed to one end of the piston rod extending to the outside of the sealing channel, and a first sealing ring is provided on the surface of the pushing portion, which is in close contact with the inner wall surface of the cylinder.

[0007] By adopting the above technical solution, the precision-machined inner wall of the cylinder provides axial guiding accuracy for the piston rod, preventing eccentric wear caused by metal shrinkage at low temperatures. The first sealing ring adopts fluororubber composite material to form a dynamic sealing surface on the push part to ensure that the first air chamber is leak-free under high pressure.

[0008] Furthermore, the temperature control valve includes a valve housing installed in the cylinder, the valve housing is divided into a first fixing part and a second fixing part, and a second sealing ring is fixed to the outer wall surface of the peripheral side of the first fixing part.

[0009] By adopting the above technical solution, the first fixing part and the second fixing part are detachably connected, and the second sealing ring forms a radial static seal between the valve housing and the cylinder, preventing the gas in the first air cavity from leaking into the second air cavity when the temperature control valve is closed.

[0010] Furthermore, the middle parts of the first fixed part and the second fixed part are each provided with an active cavity connected to each other, and the interior of the second fixed part is also provided with a liquid storage cavity, and the liquid storage cavity is connected to the active cavity. An air channel is provided at the connection between the first fixed part and the second fixed part, and the air channel is connected to the active cavity. A gap is reserved between the outer wall surface of the second fixed part and the inner wall surface of the cylinder, and the first air cavity and the second air cavity are connected to the air channel through the active cavity.

[0011] By adopting the above technical solution, the liquid storage chamber and the active chamber are directly connected, so that the volume change of the phase change material can be directly transmitted to the valve core with zero delay, and the gap reserved between the air channel and the second fixed part and the cylinder can ensure the connection or isolation between the first air chamber and the second air chamber.

[0012] Furthermore, a valve core is slidably provided in the movable cavity, and the valve core includes a core head, a core seat and a connecting portion. The core head and the core seat are fixed as a whole through the connecting portion. The core head slides in the first fixing portion, and the core seat slides in the second fixing portion.

[0013] By adopting the above technical solution, the length of the connection part can accurately match the shrinkage rate of the phase change material. When closed at low temperature, the phase change material solidifies and shrinks, and the core seat loses support. The nitrogen pushes the core head to the right, and the core head is tightly attached to the third sealing ring, and the active cavity is closed, and the airway is closed. The gas in the first air cavity can no longer enter the second air cavity, and the volume in the cylinder is reduced; when opened at normal temperature, the phase change material melts and expands, and pushes the core seat to the left, and the core head is no longer tightly attached to the third sealing ring, and the active cavity and the airway are opened, and the gas in the first air cavity and the second air cavity is interconnected.

[0014] Furthermore, the inner wall surface of the first fixing portion and the outer wall surface of the core head, as well as the outer wall surface of the core seat and the inner wall surface of the second fixing portion are all sealed by a third sealing ring.

[0015] By adopting the above technical solution, the third sealing ring at the core head can block the gas from entering the active cavity, and the third sealing ring at the core seat can block the phase change material from penetrating into the first air cavity or the second air cavity.

[0016] Furthermore, the diameter of the connecting portion is smaller than that of the core head and the core seat, and the diameter of the core seat is larger than that of the core head.

[0017] By adopting the above technical solution, when the phase change material has not solidified, the core head extends out of the active cavity under the pressure of the phase change material and does not contact the third sealing ring. At this time, the connecting part is smaller in diameter than the core head, and thus the active cavity cannot be sealed by the third sealing ring, so that the gas of the first air cavity and the second air cavity are interconnected. At the same time, the diameter of the core seat is larger than the core head, and thus the diameter of the active cavity of the second fixed part is larger than the diameter of the active cavity of the first fixed part. When the phase change material has not solidified, the core seat can well contact the outside of the active cavity of the first fixed plate, preventing the phase change material from flowing into the first air cavity or the second air cavity.

[0018] Furthermore, the interior of the liquid storage cavity is filled with phase change material.

[0019] By adopting the above technical solution, the phase change material can undergo a physical transformation under changes in temperature, thereby controlling the opening and closing of the temperature control valve.

[0020] Furthermore, a displacement cavity is reserved on the inner wall of the second fixed portion located at the rear side of the airway, a magnet is slidably provided in the displacement cavity, a connecting rod is fixed on the side of the magnet facing the valve core, a movable rod is rotatably provided on the circumferential side of the core seat, the movable rod is movably connected to the connecting rod, and a magnetorheological fluid cavity is fixed on the outer wall of the cylinder opposite to the displacement cavity.

[0021] By adopting the above technical solution, the magnet is adapted to the displacement cavity and can slide up and down in the displacement cavity. When the valve core changes the connectivity between the first air cavity and the second air cavity, the magnet slides up and down in the displacement cavity driven by the connecting rod and the movable rod, and the distance between the magnet and the magnetorheological fluid cavity will change, and the magnetic attraction force between the magnet and the magnetorheological fluid cavity will change. The smaller the distance, the greater the magnetic attraction force, and vice versa. In a low temperature environment, a certain damping force is generated on the valve core, thereby reducing the vibration amplitude of the valve core, thereby reducing the wear of the sealing ring and extending the service life.

[0022] Furthermore, a fourth sealing ring is fixed on the circumferential side of the inner wall surface of the second fixing portion between the airway and the displacement cavity.

[0023] By adopting the above technical solution, when the valve core is opened, the first air cavity is connected to the second air cavity, and the fourth sealing ring can fit tightly with the core seat, so that the gas in the first air cavity can only flow into the second air cavity through the airway and will not flow into the displacement cavity.

[0024] The beneficial effects of the present invention are:

[0025] 1. The present invention divides the cylinder into the first and second air chambers through the arrangement of the first and second air chambers. The temperature control valve closes the second air chamber at low temperatures, thereby reducing the effective volume and greatly improving the gas compression ratio, thereby ensuring the support force retention rate at low temperatures.

[0026] 2. Through the setting of the temperature control valve, the phase change material in the temperature control valve can undergo a physical form change under the change of temperature, thereby controlling the opening and closing of the temperature control valve, realizing the connectivity between the first air cavity and the second air cavity, changing the volume in the cylinder, and thus changing the size of the supporting force.

[0027] 3. The present invention arranges a magnet, a displacement chamber, and a magnetorheological fluid chamber. In a low-temperature environment, when the valve core retracts, the magnet slides upward along the displacement chamber, thereby shortening the distance between the magnet and the magnetorheological fluid chamber, increasing the magnetic attraction, and providing damping force for the valve core, reducing the vibration of the valve core, and further reducing the wear of the sealing ring that has hardened due to embrittlement, thereby increasing the service life.

[0028] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 Schematic diagram of the overall cross-sectional structure of an embodiment of the present invention;

[0031] Figure 2 Schematic diagram of the cross-sectional structure of the valve core retraction according to an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the cross-sectional structure of the valve core according to an embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the valve core structure according to an embodiment of the present invention;

[0034] Figure 5 Schematic diagram of the gas movement trajectory when the valve core is opened according to an embodiment of the present invention;

[0035] Figure 6 Schematic diagram of the gas movement trajectory when the valve core is closed according to an embodiment of the present invention;

[0036] Figure numerals: 1. Cylinder; 11. Magnetorheological fluid chamber; 2. Piston rod; 3. Sealing guide; 31. Sealing channel; 32. Pushing part; 4. Temperature control valve; 41. Valve housing; 42. First fixed part; 421. Movable chamber; 43. Second fixed part; 431. Liquid storage chamber; 432. Displacement chamber; 4321. Magnet; 4322. Connecting rod; 44. Second sealing ring; 45. Air channel; 46. Valve core; 461. Core head; 462. Core seat; 4621. Movable rod; 463. Connecting part; 47. Third sealing ring; 48. Fourth sealing ring; 5. First air chamber; 6. Second air chamber. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of specific embodiments of the present invention. The same figure marks in the drawings represent the same components. It should be noted that the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described 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.

[0038] Reference Figures 1-6The embodiment of the present invention proposes a low-temperature environment adaptive gas spring with a phase change compensation mechanism, including a cylinder 1, a piston rod 2 is provided in the cylinder 1, and a sealing guide 3 is further provided inside the cylinder 1. The sealing guide 3 includes a sealing channel 31 provided on the inner wall surface of the cylinder 1, and the piston rod 2 is slidably arranged in the sealing channel 31. A pushing part 32 is fixed to one end of the piston rod 2 extending to the outside of the sealing channel 31, and a first sealing ring is provided on the surface of the pushing part 32. The first sealing ring is tightly attached to the inner wall surface of the cylinder 1. The precisely machined inner wall surface of the cylinder 1 provides axial guiding accuracy for the piston rod 2 to prevent eccentric wear caused by metal shrinkage at low temperatures, and forms a dynamic sealing surface on the pushing part 32 to ensure that the first air cavity 5 is leak-free under high pressure.

[0039] Reference Figures 1-6 , the interior of the cylinder 1 is also provided with a temperature control valve 4, which divides the cylinder 1 into a first air chamber 5 and a second air chamber 6. The temperature control valve 4 includes a valve housing 41 installed in the cylinder 1, and the valve housing 41 is divided into a first fixing portion 42 and a second fixing portion 43. The first fixing portion 42 and the second fixing portion 43 are integral. A second sealing ring 44 is fixed to the outer wall surface of the peripheral side of the first fixing portion 42. The second sealing ring 44 adopts a one-way valve structure or directly adopts a one-way valve as a whole, which can only support one-way flow of gas. The first fixing portion 42 and the second fixing portion 43 are detachably connected. The second sealing ring 44 forms a one-way between the valve housing 41 and the cylinder 1 The radial static seal prevents the gas in the first air cavity 5 from leaking into the second air cavity 6 when the temperature control valve 4 is closed. When the gas pressure in the second air cavity 6 is higher than that in the first air cavity 5 when the temperature control valve 4 is closed, the gas in the second air cavity 6 can flow back to the first air cavity 5 through the second sealing ring 44 of the one-way valve structure, thereby compensating the first air cavity 5. At the same time, the outer peripheral wall of the first fixing portion 42 is also provided with a groove, and the inner wall surface of the cylinder 1 is also provided with a convex edge, which can be engaged in the groove, thereby achieving the purpose of the valve housing 41 being mounted on the inner wall surface of the cylinder 1 through the first fixing portion 42 as a whole, thereby preventing the valve housing 41 from being displaced inside the cylinder 1.

[0040] Reference Figures 1-6, the middle parts of the first fixed part 42 and the second fixed part 43 are both provided with active cavities 421 that are connected to each other, and the interior of the second fixed part 43 is further provided with a liquid storage cavity 431, and the interior of the liquid storage cavity 431 is filled with a solid-liquid phase change material, such as fatty acid esters. The solid-liquid phase change material can transform the physical form of liquid and solid under the change of temperature, thereby controlling the opening and closing of the temperature control valve 4, and the liquid storage cavity 431 is connected with the active cavity 421. An air channel 45 is provided at the connection between the first fixed part 42 and the second fixed part 43. The air channels 45 are equidistantly spaced around the circumference of the connection between the first fixed part 42 and the second fixed part 43, and the air channels 45 are connected with the active cavity 421. A gap is reserved between the outer wall surface of the second fixed part 43 and the inner wall surface of the cylinder 1, because the first air cavity 5 and the second air cavity 6 is connected to the air channel 45 through the active chamber 421, and the gap reserved between the air channel 45 and the second fixed part 43 and the cylinder 1 can ensure the communication or isolation between the first air chamber 5 and the second air chamber 6. A valve core 46 is also slidably provided in the active chamber 421. The valve core 46 includes a core head 461, a core seat 462 and a connecting part 463. The core head 461 and the core seat 462 are fixed as a whole through the connecting part 463. The core head 461 slides in the first fixed part 42, and the core seat 462 slides in the second fixed part 43. The inner wall of the second fixed part 43 at the rear side of the air channel 45 is reserved with a displacement chamber 432. A magnet 4321 is slidably provided in the displacement chamber 432. A connecting rod 4322 is fixed to the side of the magnet 4321 facing the valve core 46. The core seat 462 is provided with a circumferential rotation mechanism. The movable rod 4621 is movably connected to the connecting rod 4322. The outer wall of the cylinder 1 opposite to the displacement chamber 432 is fixed with a magnetorheological fluid chamber 11. The magnet 4321 is adapted to the displacement chamber 432 and can slide up and down in the displacement chamber 432. When the valve core 46 changes the connection between the first air chamber 5 and the second air chamber 6, the magnet 4321 slides up and down in the displacement chamber 432 through the drive of the connecting rod 4322 and the movable rod 4621, and then the distance between the magnet 4321 and the magnetorheological fluid chamber 11 changes, and then the magnetic attraction between the magnet 4321 and the magnetorheological fluid chamber 11 changes. The smaller the distance, the greater the magnetic attraction, and vice versa, the smaller the magnetic attraction, and thus in a low temperature environment, a certain damping force is generated on the valve core 46. The vibration amplitude of the valve core 46 is reduced, thereby reducing the wear of the brittle sealing ring in a low temperature environment, avoiding excessive friction between the valve core 46 and the sealing ring, which may cause the brittle sealing ring to be damaged, and extending the service life. The length of the connecting portion 463 can accurately match the shrinkage rate of the phase change material. When closed at low temperature, the phase change material solidifies and shrinks, and the core seat 462 loses its support. The gas in the first air cavity 5 pushes the core head 461 to the right, and the core head 461 is tightly attached to the third sealing ring 47, and the movable cavity 421 is closed, and the airway 45 is closed. The gas in the first air cavity 5 can no longer enter the second air cavity 6, and the volume in the cylinder 1 is reduced. At the same time, the magnet 4321 can slide toward the top of the displacement cavity 432 under the synchronous drive of the movable rod 4621 and the connecting rod 4322.Further, the distance between the magnet 4321 and the magnetorheological fluid cavity 11 is reduced, and the magnet 4321 and the magnetorheological fluid cavity 11 generate a larger magnetic attraction force, thereby providing a certain damping force for the valve core 46, reducing the vibration of the valve core 46, reducing the wear of the sealing ring, and prolonging the service life; when the normal temperature is opened, the phase change material melts and expands, thereby pushing the core seat 462 to move left, and the core head 461 is no longer in close contact with the third sealing ring 47, and the movable cavity 421 is opened with the gas channel 45, and the gas in the first gas cavity 5 and the second gas cavity 6 communicates, because the liquid storage cavity 431 is directly connected with the movable cavity 421, the volume change of the phase change material can be directly transmitted to the valve core 46 with zero delay, and in the process of the phase change material pressing the valve core 46 to the left, the magnet 4321 slides downward, thereby increasing the distance between the magnet 4321 and the magnetorheological fluid cavity 11, and the magnetic attraction force is reduced.

[0041] Referring to Figures 1-6 The inner wall surface of the first fixed part 42 and the outer wall surface of the core head 461 and the outer wall surface of the core seat 462 and the inner wall surface of the second fixed part 43 are all sealed by the third sealing ring 47, the third sealing ring 47 at the core head 461 can block the gas from entering the movable cavity 421 when the phase change material solidifies, thereby blocking the gas communication between the first gas cavity 5 and the second gas cavity 6, and the third sealing ring 47 at the core seat 462 can block the phase change material from seeping into the first gas cavity 5 or the second gas cavity 6.

[0042] Referring to Figures 1-6 The diameter of the connecting part 463 is smaller than that of the core head 461 and the core seat 462, and the diameter of the core seat 462 is larger than that of the core head 461, when the phase change material is not solidified, the core head 461 is extruded out of the movable cavity 421 by the phase change material and does not contact the third sealing ring 47, at this time, the connecting part 463 cannot seal the movable cavity 421 through the third sealing ring 47 because its diameter is smaller than that of the core head 461, thereby the gas in the first gas cavity 5 and the second gas cavity 6 communicates, the fourth sealing ring 48 is fixed on the inner wall surface of the second fixed part 43 between the gas channel 45 and the displacement cavity 432, when the first gas cavity 5 and the second gas cavity 6 communicate, the fourth sealing ring 48 can be in close contact with the core seat 462, so that the gas in the first gas cavity 5 can only flow into the second gas cavity 6 through the gas channel 45, and cannot flow into the displacement cavity 432, and the diameter of the core seat 462 is larger than that of the core head 461, thereby the diameter of the movable cavity 421 of the second fixed part 43 is larger than that of the movable cavity 421 of the first fixed part 42, when the phase change material is not solidified, the core seat 462 can be well abutted outside the movable cavity 421 of the first fixed part 42, avoiding the phase change material flowing into the first gas cavity 5 or the second gas cavity 6, so that the phase change material can only be stored in the liquid storage cavity 431, wherein the first sealing ring, the third sealing ring 47 and the fourth sealing ring 48 all adopt fluorine rubber composite material.

[0043] The implementation is specific: when used at normal temperature, the phase change material is in liquid state, the core seat 462 is pushed against the outside of the movable cavity 421 of the first fixed part 42 under the pressure of the phase change material, and then the core head 461 and the connecting part 463 are displaced in the direction of the first gas cavity 5, and then the outer peripheral wall of the core head 461 is no longer in contact with the third sealing ring 47, and then the gas in the first gas cavity 5 can enter the second gas cavity 6 through the gap between the core head 461 and the movable cavity 421 and the gas channel 45, and at normal temperature, the sealing ring will not denature and become brittle, and even if vibration occurs, it will not cause too much wear to the sealing ring. When used in a low-temperature environment converted from a normal-temperature environment, the phase change material gradually solidifies into a solid state, and then the volume is reduced, the core seat 462, the core head 461 and the connecting part 463 are completely pushed back to the inside of the movable cavity 421 under the pressure of the gas in the first gas cavity 5, and then the outer peripheral wall of the core head 461 is again in close contact with the third sealing ring 47, achieving the effect that the first gas cavity 5 and the second gas cavity 6 cannot communicate through the movable cavity 421 and the gas channel 45, and then the volume of the cylinder barrel 1 is compressed to only leave the gas in the first gas cavity 5, improving the gas compression ratio, and then changing the size of the supporting force, ensuring the supporting force at low temperature. At the same time, in a low-temperature environment, the sealing ring will denature and become brittle, causing the overall material of the sealing ring to become hard, and excessive friction will cause the sealing ring to break. When the distance between the magnet 4321 and the magnetorheological fluid cavity 11 is shortened, a certain damping force is provided for the valve core 46, the vibration of the valve core 46 is reduced, the wear of the sealing ring is reduced, and the service life is prolonged.

[0044] The basic principles and main features of the present application and the advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A low temperature environment adaptive gas spring with a phase change compensation mechanism, characterized in that: The invention comprises a cylinder (1), wherein a piston rod (2) is provided in the cylinder (1), a sealing guide (3) is provided inside the cylinder (1), a temperature control valve (4) is provided inside the cylinder (1), and the temperature control valve (4) divides the cylinder (1) into a first air chamber (5) and a second air chamber (6). The sealing guide (3) comprises a sealing channel (31) provided around the inner wall surface of the cylinder (1), the piston rod (2) is slidably arranged in the sealing channel (31), and a pushing portion (32) is fixed to one end of the piston rod (2) extending to the outside of the sealing channel (31). ), a first sealing ring is provided on the surface of the pushing portion (32), and the first sealing ring is in close contact with the inner wall surface of the cylinder (1), the temperature control valve (4) includes a valve housing (41) installed in the cylinder (1), and the valve housing (41) is divided into a first fixed portion (42) and a second fixed portion (43), a second sealing ring (44) is fixed to the outer wall surface of the peripheral side of the first fixed portion (42), and a displacement cavity (432) is reserved on the inner wall of the second fixed portion (43) located at the rear side of the airway (45), and a magnet (4321) is slidably provided in the displacement cavity (432), the A connecting rod (4322) is fixed on the side of the magnet (4321) facing the valve core (46). The valve core (46) includes a core head (461), a core seat (462) and a connecting portion (463). A movable rod (4621) is provided on the circumferential side of the core seat (462). The movable rod (4621) is movably connected to the connecting rod (4322). A magnetorheological fluid chamber (11) is fixed on the outer wall of the cylinder (1) opposite to the displacement chamber (432). The middle parts of the first fixed portion (42) and the second fixed portion (43) are both provided with movable chambers (421) that are connected to each other. A liquid storage cavity (431) is further provided inside the second fixed portion (43), and the liquid storage cavity (431) is communicated with the active cavity (421). An air channel (45) is provided at the connection between the first fixed portion (42) and the second fixed portion (43), and the air channel (45) is communicated with the active cavity (421). A gap is reserved between the outer wall surface of the second fixed portion (43) and the inner wall surface of the cylinder (1). The first air cavity (5) and the second air cavity (6) are communicated with the air channel (45) through the active cavity (421). The interior of the liquid storage cavity (431) is filled with a phase change material.

2. The low-temperature environment adaptive gas spring with a phase change compensation mechanism according to claim 1, characterized in that: A valve core (46) is also slidably provided in the movable chamber (421), and the core head (461) and the core seat (462) are fixed as a whole via a connecting portion (463). The core head (461) slides in the first fixing portion (42), and the core seat (462) slides in the second fixing portion (43).

3. The low-temperature environment adaptive gas spring with a phase change compensation mechanism according to claim 2, characterized in that: The inner wall surface of the first fixing portion (42) and the outer wall surface of the core head (461), as well as the outer wall surface of the core seat (462) and the inner wall surface of the second fixing portion (43) are all sealed via a third sealing ring (47).

4. The low-temperature environment adaptive gas spring with a phase change compensation mechanism according to claim 2, characterized in that: The diameter of the connecting portion (463) is smaller than that of the core head (461) and the core seat (462), and the diameter of the core seat (462) is larger than that of the core head (461).

5. The low-temperature environment adaptive gas spring with a phase change compensation mechanism according to claim 1, characterized in that: A fourth sealing ring (48) is fixed to the circumferential side of the inner wall of the second fixing portion (43) between the air passage (45) and the displacement chamber (432).

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