Gas spring

Abstract

The utility model discloses a gas spring which comprises a cylinder barrel, a piston rod and a piston assembly. The piston assembly is arranged at the first end of the piston rod and divides the cylinder barrel into a first cavity and a second cavity, the piston assembly comprises a first piston piece, a second piston piece and a sealing ring, the first piston piece comprises a first component and a second component, and the sealing ring is arranged on the second component in a sleeving mode and located between the first component and the second piston piece. The first component is provided with a first flow channel, a second flow channel is formed between the outer edge of the second component and the inner wall of the cylinder barrel, the first flow channel communicates with the first cavity and the second flow channel, a first labyrinth groove is formed among the first piston piece, the second piston piece and the piston rod, the second piston piece is provided with a throttling hole, and the two ends of the first labyrinth groove communicate with the first cavity and the throttling hole correspondingly. The throttling hole is communicated with the second cavity. According to the gas spring, the resistance in the stretching process can be changed according to the external force, so that the use experience of a user when the gas spring is applied to doors and windows for buffering is improved.

Description

Technical Field

[0001] This application relates to the field of damping components, and in particular to a gas spring. Background Art

[0002] In related technologies, conventional damper-type gas springs typically require less effort during piston rod compression but more effort during extension, with the resistance remaining constant during extension. This type of damper-type gas spring is primarily used for cushioning during door opening and closing. Specifically, the gas spring compresses as the door opens, and during closing, the piston rod, located within the cylinder, has a piston assembly. The flow channel within this assembly provides resistance to the fluid during piston rod extension. However, regardless of the external force applied to the piston rod, the resistance remains constant during extension. This can lead to the following: if the initial flow channel design provides excessive airflow resistance, closing the door becomes difficult; conversely, if the initial design provides insufficient airflow resistance, the door closes too quickly, resulting in rebound and affecting the closing effect. Utility Model Content

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a gas spring that can change the resistance during the stretching process according to the application of external force, thereby improving the user experience when used in doors and windows as a buffer.

[0004] A gas spring according to an embodiment of the present invention includes: a cylinder, a piston rod, and a piston assembly. A sealed chamber is formed inside the cylinder. A first end of the piston rod is slidably connected inside the cylinder, and a second end of the piston rod is located outside the cylinder. The piston assembly is disposed at the first end and divides the chamber into a first chamber and a second chamber, which are sequentially located away from the second end. The piston assembly includes a first piston member, a second piston member, and a sealing ring. The first piston member includes a first component and a second component located on the side of the first component away from the second end. The outer circumferential dimension of the second component is smaller than that of the first component. The second piston member is located on the side of the second component away from the first component. The sealing ring is sleeved on the second component and located between the first component and the second piston member, and is interference-fitted with the inner wall of the cylinder. The first component has a first flow channel, and a second flow channel is formed between the outer edge of the second component and the inner wall of the cylinder. A flow channel connects the first chamber and the second flow channel. A first labyrinth groove is provided between the first piston, the second piston, and the piston rod. The second piston has a throttling orifice. The two ends of the first labyrinth groove are connected to the first chamber and the throttling orifice, respectively. The throttling orifice is connected to the second chamber. When the piston rod extends outward, the sealing ring blocks the gap between the second piston and the inner wall of the cylinder. When the piston rod extends outward and is not subjected to external force, the fluid in the first chamber enters the second chamber after passing through the first labyrinth groove and the throttling orifice in sequence. When the piston rod extends outward and is subjected to tensile external force, the second piston deforms and forms a gap with the first piston. The fluid in the first chamber can enter the second chamber through the first flow channel, the second flow channel, the gap, and the throttling orifice. The combined resistance effect of the first flow channel, the second flow channel, and the gap on the fluid is less than that of the first labyrinth groove.

[0005] The gas spring according to the present invention has at least the following beneficial effects: The gas spring includes a cylinder, a piston rod, and a piston assembly. The first end of the piston rod is slidably connected to the sealed cylinder. The piston assembly is located at the first end and includes a first piston member, a second piston member, and a sealing ring. The first piston member includes a first component and a second component. The first component, the second component, and the second piston member are sequentially located on the side away from the second end of the piston rod. The outer circumferential dimension of the second component is smaller than that of the first component. The sealing ring is sleeved on the second component and located between the first component and the second piston member. When the piston rod extends, the sealing ring blocks the flow channel between the second piston member and the inner wall of the cylinder. Therefore, the fluid in the first chamber near the second end of the cylinder cannot enter the second chamber through the flow channel between the second piston member and the cylinder. When the piston rod extends and is not subjected to other external forces, the fluid in the first chamber will enter the second chamber through the first labyrinth groove between the first piston member, the second piston member, and the piston rod, and the throttling orifice provided on the second piston member. While the piston rod extends, it is also subjected to external tensile forces. At this time, the sealing ring is subjected to a large frictional force, thereby squeezing the outer surface of the second piston member. The first component deforms away from the second end, thus forming a gap between the second piston and the second component. The first component has a first flow channel, and the outer edge of the second component forms a second flow channel between the cylinder wall and the first flow channel. The first flow channel connects the first chamber and the second flow channel. The gap between the second component and the second piston connects the second flow channel and the throttling orifice. The combined effect of the first flow channel, the second flow channel, and the gap on fluid resistance is less than that of the first labyrinth groove. At this time, the fluid in the first chamber can directly enter the throttling orifice through the first flow channel, the second flow channel, and the gap, without passing through the first labyrinth groove. Therefore, when the piston rod is subjected to... Under the action of external stretching force, the resistance encountered by the fluid during the process of moving from the first chamber to the second chamber will be less than the resistance encountered during the stretching process without external force. That is, when applied to the closing process of a door, the resistance is smaller when the user pushes the door to close it, and it is easier to close the door. When the user does not apply any force to close the door, the door will close slowly and automatically under the buffering effect of the gas spring to avoid rebound. Therefore, the gas spring of this application has the function of changing the resistance during the stretching process according to the action of external force, so as to improve the user experience when it is used in doors and windows as a buffer.

[0006] According to some embodiments of the present invention, the second piston is further provided with a second labyrinth groove, and the throttling orifice is connected to the second chamber through the second labyrinth groove.

[0007] According to some embodiments of the present invention, the first labyrinth groove includes a first labyrinth channel and a third flow channel. The first labyrinth channel is located on the opposite side of the second component and the second piston component. The third flow channel is disposed on the first piston component and connects the first chamber and the first labyrinth channel. The first labyrinth channel connects to the throttling orifice.

[0008] According to some embodiments of this utility model, the third flow channel is provided with a second labyrinth channel.

[0009] According to some embodiments of the present invention, the first maze path, the second maze path, and the second maze groove all include an arc-shaped cavity.

[0010] According to some embodiments of the present invention, the piston assembly further includes a first gasket and a second gasket, wherein the first gasket is pressed onto the side of the second piston member opposite to the first piston member, and the second gasket is pressed onto the side of the first piston member opposite to the second piston member.

[0011] According to some embodiments of the present invention, the second piston member is provided with a transition groove on the side opposite to the first piston member, the second labyrinth groove is connected to the second chamber through the transition groove, the first gasket covers the throttling orifice and the second labyrinth groove, the outer peripheral dimension of the first gasket is smaller than the outer peripheral dimension of the second piston member, and avoids the transition groove.

[0012] According to some embodiments of the present invention, a first flow channel is formed between the outer edge of the first component and the inner wall of the cylinder.

[0013] According to some embodiments of the present invention, the first component is provided with a plurality of clearance holes along the circumferential direction, the clearance holes connecting the first chamber and the second flow channel, and the second gasket is provided to avoid the clearance holes.

[0014] According to some embodiments of the present invention, a guide assembly is also included, which is fixedly sealed at one end of the cylinder near the second end, and the piston rod is slidably sealed with the guide assembly.

[0015] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the gas spring of this utility model;

[0018] Figure 2 for Figure 1 A cross-sectional view of the gas spring shown;

[0019] Figure 3 for Figure 2 A partial enlarged view of point A in the middle;

[0020] Figure 4 for Figure 1 A schematic diagram of the piston rod and piston assembly in the gas spring shown;

[0021] Figure 5 for Figure 1 A schematic diagram of the piston rod and piston assembly in the gas spring shown from another perspective;

[0022] Figure 6 for Figure 1 An exploded view of the piston assembly in the gas spring shown.

[0023] Figure 7 for Figure 1 Another exploded view of the piston assembly in the gas spring shown.

[0024] Figure label:

[0025] Cylinder 100; First chamber 101; Second chamber 102; Piston rod 200; First end 201; Second end 202; Piston assembly 300; First piston part 310; First component 311; First flow channel 3111; Clearance hole 3112; Second component 312; Second flow channel 3121; Second piston part 320; Throttling hole 321; Second labyrinth groove 322; Transition groove 323; Sealing ring 330; First gasket 340; Second gasket 350; Guide assembly 400; First labyrinth channel 511; Second labyrinth channel 512; Connecting groove 513; Through groove 514. DETAILED DESCRIPTION

[0026] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0027] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0028] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0029] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0030] In the description of this application, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] The following is for reference. Figures 1 to 7 This invention describes a gas spring according to an embodiment of the present invention.

[0032] like Figures 1 to 6As shown, the gas spring according to an embodiment of the present invention includes: a cylinder 100, a piston rod 200, and a piston assembly 300. A sealed chamber is formed within the cylinder 100. A first end 201 of the piston rod 200 is slidably connected within the cylinder 100, and a second end 202 of the piston rod 200 is located outside the cylinder 100. The piston assembly 300 is disposed at the first end 201 and divides the chamber into a first chamber 101 and a second chamber 102, which are sequentially located away from the second end 202. The piston assembly 300 includes a first piston member 310, a second piston member 320, and a sealing ring 330. The first piston component 310 includes a first component 311 and a second component 312 located on the side of the first component 311 away from the second end 202. The outer periphery of the second component 312 is smaller than that of the first component 311. The second piston component 320 is located on the side of the second component 312 away from the first component 311. A sealing ring 330 is sleeved on the second component 312 and located between the first component 311 and the second piston component 320, and is interference-fitted with the inner wall of the cylinder 100. The first component 311 is provided with a first flow channel 3111. The outer edge of the second component 312 is between the inner wall of the cylinder 100 and the first flow channel 3111. A second flow channel 3121 is formed, and the first flow channel 3111 connects the first chamber 101 and the second flow channel 3121. A first labyrinth groove is provided between the first piston member 310, the second piston member 320, and the piston rod 200. The second piston member 320 is provided with a throttling orifice 321. The two ends of the first labyrinth groove are respectively connected to the first chamber 101 and the throttling orifice 321, and the throttling orifice 321 is connected to the second chamber 102. When the piston rod 200 extends outward, the sealing ring 330 seals the gap between the second piston member 320 and the inner wall of the cylinder 100. When the piston rod 200 extends outward and When no external force is applied, the fluid in the first chamber 101 enters the second chamber 102 after passing through the first labyrinth groove and the throttling orifice 321 in sequence. When the piston rod 200 extends outward and is subjected to a tensile force, the second piston 320 deforms and forms a gap with the first piston 310. The fluid in the first chamber 101 can enter the second chamber 102 through the first flow channel 3111, the second flow channel 3121, the gap, and the throttling orifice 321. The combined resistance effect of the first flow channel 3111, the second flow channel 3121, and the gap on the fluid is less than that of the first labyrinth groove.

[0033] Understandably, this gas spring includes a cylinder 100, a piston rod 200, and a piston assembly 300. The first end 201 of the piston rod 200 is slidably connected to the sealed cylinder 100. The piston assembly 300 is located at the first end 201 and includes a first piston member 310, a second piston member 320, and a sealing ring 330. The first piston member 310 includes a first component 311 and a second component 312. The first component 311, the second component 312, and the second piston member 320 are sequentially located on the side away from the second end 202 of the piston rod 200. The outer circumference of the second component 312 is smaller than that of the first component 311. The sealing ring 330 is fitted onto the second component 312 and is located between the first component 311 and the second piston member 320. When the piston rod 200 extends, the sealing ring 330 blocks the flow channel between the second piston member 320 and the inner wall of the cylinder 100. Therefore, the fluid in the first chamber 101 near the second end 202 of the cylinder 100 cannot enter the second chamber 102 through the flow channel between the second piston member 320 and the cylinder 100. Furthermore, when the piston rod 200 extends and is not subjected to any other external force, the fluid in the first chamber 101 will enter the second chamber 102 through the first labyrinth groove between the first piston member 310, the second piston member 320, and the piston rod 200, as well as the throttling orifice 321 provided on the second piston member 320. However, when the piston rod 200 extends and is also subjected to external tensile forces, the sealing ring 330 is subjected to significant stress. The frictional force causes the outer edge of the second piston 320 to deform away from the second end 202, thus forming a gap between the second piston 320 and the second component 312. The first component 311 is provided with a first flow channel 3111, and a second flow channel 3121 is formed between the outer edge of the second component 312 and the inner wall of the cylinder 100. The first flow channel 3111 connects the first chamber 101 and the second flow channel 3121. The gap between the second component 312 and the second piston 320 connects the second flow channel 3121 and the throttling orifice 321. The combined effect of the first flow channel 3111, the second flow channel 3121, and the gap on fluid resistance is less than that of the first labyrinth groove. At this time, the fluid in the first chamber 101 can directly pass through the first flow channel 3111. The fluid enters the throttling orifice 321 through the second flow channel 3121 and the gap, instead of passing through the first labyrinth groove. Therefore, when the piston rod 200 is stretched by an external force, the resistance encountered by the fluid in the process of entering the second chamber 102 from the first chamber 101 will be less than the resistance encountered in the stretching process when no external force is applied. That is, when applied to the closing process of a door, the resistance is smaller when the user pushes the door to close it, and closing the door is easier. When the user does not apply a closing force to the door, the door will slowly and automatically close under the buffering effect of the gas spring to avoid rebound. Therefore, the gas spring of this application has the function of changing the resistance in the stretching process according to the external force to improve the user experience when used in doors and windows as a buffer.

[0034] Understandably, the second piston 320 also includes a second labyrinth groove 322, through which the throttle orifice 321 connects to the second chamber 102. For example, as... Figures 3 to 7 As shown, in this embodiment, the second piston 320 is provided with a second labyrinth groove 322 that connects the throttling orifice 321 and the second chamber 102. This ensures that during the extension of the piston rod 200, regardless of whether there is an external force, the fluid in the first chamber 101 will enter the second chamber 102 through the second labyrinth groove 322 after passing through the throttling orifice 321. The second labyrinth groove 322 increases the resistance of the fluid in the first chamber 101 entering the second chamber 102, thereby improving the stability when closing the door. Even if the user closes the door manually, it can reduce the phenomenon of door rebound, making the closing process smoother.

[0035] Understandably, the first labyrinth groove includes a first labyrinth channel 511 and a third flow channel. The first labyrinth channel 511 is located on the opposite side of the second component 312 and the second piston component 320. The third flow channel is located on the first piston component 310 and connects the first chamber 101 and the first labyrinth channel 511. The first labyrinth channel 511 connects to the throttling orifice 321. For example, as... Figure 6 As shown, in this embodiment, the first labyrinth groove includes a first labyrinth channel 511 and a third flow channel. The first labyrinth channel 511 is located on the opposite side of the second component 312 and the second piston component 320. That is, the first labyrinth channel 511 can be disposed on the side of the second component 312 facing the second piston component 320, or on the side of the second piston component 320 facing the second component 312, or even simultaneously on the opposite side of the second component 312 facing the second piston component 320 and the second piston component 320 facing the second component 312. In short, it is disposed between the second component 312 and the second piston component 320. The third flow channel is disposed on the first piston component 310 and connects the first chamber 101 and the first labyrinth channel 511. The first labyrinth channel 511 is also connected to the throttling orifice 321. Thus, when the piston rod 200 is stretched and not stretched by external force, the fluid in the first chamber 101 will enter the second chamber 102 through the third flow channel, the first labyrinth channel 511 and the throttling orifice 321.

[0036] Understandably, the third flow path contains a second maze path 512. For example, as... Figure 6 As shown, in this embodiment, a second labyrinth channel 512 is provided in the third flow channel, thereby improving the smoothness of the process of gas entering the second chamber 102 from the first chamber 101 when the piston rod 200 is stretched and not subjected to external stretching force, and also improving the smoothness of the closing process when applied to a door for buffering.

[0037] It is understandable that the first maze passage 511, the second maze passage 512, and the second maze groove 322 all include arc-shaped cavities. For example, as... Figures 6 to 7As shown, in this embodiment, the first maze 511, the second maze 512, and the second maze trough 322 are all provided with arc-shaped cavities, thereby setting the fluid resistance by the length and cross-sectional area of ​​the arc-shaped cavities.

[0038] Specifically, in this embodiment, the first maze path 511 is located on the side of the second piston 320 facing the second component 312, the second maze path 512 is located on the side of the first component 311 away from the second component 312, and the second maze groove 322 is located on the side of the second piston 320 away from the second component 312.

[0039] Understandably, the piston assembly 300 also includes a first gasket 340 and a second gasket 350. The first gasket 340 is pressed onto the side of the second piston member 320 opposite to the first piston member 310, and the second gasket 350 is pressed onto the side of the first piston member 310 opposite to the second piston member 320. For example, as... Figures 4 to 7 As shown, in this embodiment, the first gasket 340 is pressed onto the side of the second piston member 320 away from the first piston member 310, thereby reducing the pressure loss of the first end 201 of the piston rod 200 on the side of the second piston member 320 away from the second end 202. The second gasket 350 is pressed onto the side of the first piston member 310 away from the second piston member 320, thereby reducing the pressure loss of the piston rod 200 on the side of the first piston member 310 near the second end 202.

[0040] Understandably, the second piston 320, on the side opposite to the first piston 310, also has a transition groove 323. The second labyrinth groove 322 connects to the second chamber 102 through the transition groove 323. The first gasket 340 shields the throttling orifice 321 and the second labyrinth groove 322. The outer circumferential dimension of the first gasket 340 is smaller than the outer circumferential dimension of the second piston 320, and it avoids the transition groove 323. For example, as... Figures 5 to 7 As shown, in this embodiment, the first gasket 340 shields the throttling orifice 321 and the second labyrinth groove 322 on the second piston member 320, and avoids the transition groove 323. The second labyrinth groove 322 connects to the second chamber 102 through the transition groove 323, thereby realizing the connection between the throttling orifice 321 and the second chamber 102. At the same time, since the outer diameter of the first gasket 340 is smaller than the outer diameter of the second piston member 320, the second piston member 320 can be deformed under the action of external force.

[0041] It is understood that the first flow channel 3111 is formed between the outer edge of the first component 311 and the inner wall of the cylinder 100. For example, as Figures 3 to 6As shown, in this embodiment, a first flow channel 3111 can be formed between the outer edge of the first part and the inner wall of the cylinder 100. Thus, during the stretching process when an external force is applied, the fluid in the first chamber 101 can pass between the outer edge of the first part and the inner wall of the cylinder 100 and enter the second flow channel 3121. Then, it flows into the throttle hole 321 through the gap between the second component 312 and the second piston component 320 and enters the second chamber 102.

[0042] Understandably, the first component 311 has a plurality of clearance holes 3112 circumferentially arranged, the clearance holes 3112 connecting the first chamber 101 and the second flow channel 3121, and the second gasket 350 is provided to avoid the clearance holes 3112. For example, as Figures 4 to 7 As shown, in this embodiment, the outer diameter of the second gasket 350 is smaller than the outer diameter of the first component 311, and it avoids the avoidance hole 3112 circumferentially provided in the first component 311. Therefore, the avoidance hole 3112 connects the first chamber 101 and the second flow channel 3121. The avoidance hole 3112 itself can also constitute the first flow channel 3111, thereby realizing the connection between the first chamber 101 and the second flow channel 3121, which is equivalent to increasing the total cross-sectional area of ​​the first flow channel 3111. On the other hand, when the piston rod is compressed, the sealing ring blocks the first flow channel between the outer edge of the first component and the inner wall of the cylinder, so that the fluid in the second chamber can enter the second flow channel through the gap between the outer edge of the second piston and the inner wall of the cylinder, and then quickly enter the first chamber through the avoidance hole, thereby improving the ease of the piston rod compression process and realizing the effort-saving opening process.

[0043] Specifically, in addition to the second labyrinth channel 512 located on the side of the first component 311 away from the second component 312, the third flow channel also includes a through groove 514 connecting the second labyrinth channel 512 and the first labyrinth channel 511, and the through groove 514 is disposed through the first piston component 310; the third flow channel also includes a connecting groove 513 disposed on the side of the first component 311 away from the second component 312, the second gasket 350 is disposed to avoid the connecting groove 513, and the connecting groove 513 connects the first chamber 101 and the second labyrinth channel 512.

[0044] Understandably, it also includes a guide assembly 400, which is fixedly sealed to the end of the cylinder 100 near the second end 202, and the piston rod 200 is in sliding sealing engagement with the guide assembly 400. For example, as Figure 2 As shown, in this embodiment, a guide assembly 400 is fixedly sealed at one end of the cylinder 100 near the second end 202, and the piston rod 200 slides and seals with the guide assembly 400, thereby achieving the guiding effect on the piston rod 200 and the sealing of the cylinder 100.

[0045] It should be understood that, in this embodiment, the first piston 310 and the second piston 320 are made of plastic so that the outer edge of the second piston 320 can deform under the compression of the sealing ring 330 when subjected to external tensile force. The first gasket 340 and the second gasket 350 are made of a harder, less deformable material, such as iron sheet. This is to prevent the deformation of the first gasket 340 and the second gasket 350 during use from blocking the channels of the first labyrinth groove and the second labyrinth groove 322, thus affecting the normal tensile action.

[0046] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A gas spring, characterized in that, include: A cylinder barrel, wherein a sealed chamber is formed inside the cylinder barrel; A piston rod, the first end of which is slidably connected inside the cylinder, and the second end of which is located outside the cylinder; A piston assembly is disposed at the first end and divides the chamber into a first chamber and a second chamber, which are sequentially located away from the second end. The piston assembly includes a first piston member, a second piston member, and a sealing ring. The first piston member includes a first component and a second component located on the side of the first component away from the second end. The outer circumferential dimension of the second component is smaller than that of the first component. The second piston member is located on the side of the second component away from the first component. The sealing ring is fitted onto the second component and located between the first component and the second piston member, and is interference-fitted with the inner wall of the cylinder. The first component has a first flow channel, and a second flow channel is formed between the outer edge of the second component and the inner wall of the cylinder. The first flow channel connects the first chamber and the second flow channel. A first labyrinth groove is provided between the first piston member, the second piston member, and the piston rod. The second piston member has a throttling orifice. The two ends of the first labyrinth groove are respectively connected to the first chamber and the throttling orifice, and the throttling orifice is connected to the second chamber. The sealing ring can seal the gap between the second piston and the inner wall of the cylinder. The second piston can deform under the action of an outward stretching force on the piston rod and form a gap with the first piston. The gap connects the second flow channel and the throttling orifice. The combined resistance effect of the first flow channel, the second flow channel and the gap on the fluid is less than that of the first labyrinth groove.

2. The gas spring according to claim 1, characterized in that, The second piston component is also provided with a second labyrinth groove, and the throttling orifice is connected to the second chamber through the second labyrinth groove.

3. The gas spring according to claim 2, characterized in that, The first labyrinth groove includes a first labyrinth channel and a third flow channel. The first labyrinth channel is located on the opposite side of the second component and the second piston. The third flow channel is disposed on the first piston and connects the first chamber and the first labyrinth channel. The first labyrinth channel connects to the throttling orifice.

4. The gas spring according to claim 3, characterized in that, The third flow channel is equipped with a second maze passage.

5. The gas spring according to claim 4, characterized in that, The first maze path, the second maze path, and the second maze trough all include arc-shaped cavities.

6. The gas spring according to claim 2, characterized in that, The piston assembly further includes a first gasket and a second gasket, wherein the first gasket is pressed onto the side of the second piston member opposite to the first piston member, and the second gasket is pressed onto the side of the first piston member opposite to the second piston member.

7. The gas spring according to claim 6, characterized in that, The second piston member is provided with a transition groove on the side opposite to the first piston member. The second labyrinth groove is connected to the second chamber through the transition groove. The first gasket covers the throttling orifice and the second labyrinth groove. The outer peripheral dimension of the first gasket is smaller than the outer peripheral dimension of the second piston member and avoids the transition groove.

8. The gas spring according to claim 6, characterized in that, The first flow channel is formed between the outer edge of the first component and the inner wall of the cylinder.

9. The gas spring according to claim 8, characterized in that, The first component has a plurality of clearance holes along its circumference, the clearance holes connecting the first chamber and the second flow channel, and the second gasket is disposed to avoid the clearance holes.

10. The gas spring according to claim 1, characterized in that, It also includes a guide assembly, which is fixedly sealed to one end of the cylinder near the second end, and the piston rod is slidably sealed with the guide assembly.

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