Damper

Abstract

The damper comprises a cylinder barrel, a piston rod and a piston assembly, and the second end of the piston rod is located outside the cylinder barrel; the piston assembly is arranged at the first end of the piston rod and comprises a gasket, a first piston piece and a sealing ring, the gasket, a first part of the first piston piece and a second part of the first piston piece are sequentially arranged along the side away from the second end, the size of the circle where the periphery of the second part is located is smaller than that of the circle where the periphery of the first part is located, and the second part is sleeved with the sealing ring. The first piston piece is provided with a through throttling hole, a labyrinth groove is formed between the first piston piece and the gasket, the labyrinth groove is communicated with the first cavity and the throttling hole, a gap is further formed between the first component and the gasket, a first flow channel is formed between the gasket and the cylinder barrel, the first flow channel is communicated with the first cavity and the gap, and the first flow channel is communicated with the first cavity and the labyrinth groove. The damper can have a good damping effect no matter whether external force exists or not.

Description

Technical Field

[0001] The present application relates to the technical field of damping devices, and in particular to a damper. Background Art

[0002] In related art, a damper comprises a cylinder, a piston rod, and a piston assembly. The piston assembly is mounted at one end of the piston rod and slides within the cylinder as the piston rod moves. In conventional dampers, when the piston rod is compressed, the resistance encountered by the fluid flowing from one side of the piston assembly to the other remains constant. Furthermore, when the piston rod is compressed and subjected to an external force in the direction of compression, the piston rod can easily compress too quickly under greater external forces, thereby affecting the damping effect. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems in the prior art. To this end, the present application proposes a damper that can have a good damping effect regardless of whether there is an external force.

[0004] The damper according to the embodiment of the present invention includes: a cylinder, a piston rod and a piston assembly, a sealed chamber is formed inside the cylinder; the first end of the piston rod is slidably connected to the cylinder, and the second end of the piston rod is located outside the cylinder; the piston assembly is arranged at the first end of the piston rod and includes a gasket, a first piston member and a sealing ring, the piston assembly divides the chamber into a first chamber and a second chamber which are sequentially away from the second end, the first piston member includes a first component and a second component, the gasket, the first component and the second component are sequentially arranged along a side away from the second end, the size of the circle where the outer circumference of the second component is smaller than the size of the circle where the outer circumference of the first component is, the sealing ring is sleeved on the second component, the first piston member is provided with a through throttling hole, the first A labyrinth groove is provided between the piston member and the gasket, the labyrinth groove connects the first chamber and the throttle hole, a gap is also provided between the first component and the gasket, a first flow channel is formed between the gasket and the cylinder, the first flow channel connects the first chamber and the gap, and the first flow channel connects the first chamber and the labyrinth groove; when the piston rod is not compressed by external force, the fluid in the second chamber passes through the throttle hole, the gap and the first flow channel in sequence to enter the first chamber; when the piston rod is compressed by external force, the first component is deformed and can be tightly attached to the gasket to make the gap disappear, and the fluid in the second chamber passes through the throttle hole, the labyrinth groove and the first flow channel in sequence to enter the first chamber, and the resistance effect of the labyrinth groove on the fluid is greater than the resistance effect of the gap on the fluid.

[0005] The damper according to the embodiment of the utility model has at least the following beneficial effects: the damper includes a cylinder, a piston rod and a piston assembly, the piston assembly is arranged at the first end of the piston rod and can slide in the cylinder as the piston rod is extended and contracted, the second end of the piston rod is located outside the cylinder, the piston assembly forms a first chamber close to the second end and a second chamber away from the second end on both sides of the cylinder, the piston assembly includes a gasket, a first piston member and a sealing ring, the first piston member includes a first component and a second component, the gasket, the first component and the second component are sequentially away from the second end The end is set, the size of the circle where the outer circumference of the second component is smaller than the size of the circle where the circumference of the first component is, so the sealing ring is sleeved on the second component, and in the process of compression of the piston rod, the sealing ring seals the gap between the outer edge of the first component and the inner wall of the cylinder, the first piston member is provided with a through throttle hole, a first flow channel is formed between the outer edge of the gasket and the inner wall of the cylinder, a gap is provided between the gasket and the first component, the first flow channel connects the first chamber and the gap, and the throttle hole connects the gap and the second chamber; in addition, a labyrinth groove is further provided between the gasket and the first component, and the labyrinth groove connects the first flow channel and the throttle hole; During use, during compression of the piston rod, when the piston rod is not subjected to external force or is subjected to a relatively small external force in the compression direction, the resistance of the gap to the fluid is less than the resistance of the labyrinth groove to the fluid. Therefore, the fluid in the second chamber will pass through the throttle hole and then directly flow into the first flow channel through the gap, thereby entering the first chamber. The resistance encountered by the fluid in this process is also not large. However, during compression, when the piston rod is subjected to a relatively large external force in the compression direction of the piston rod, the sealing ring squeezes the outer edge of the first component and causes the outer edge of the first component to deform toward the gasket, thereby eliminating the gap between the first component and the gasket. At this time, the throttle hole can only be connected to the first flow channel through the labyrinth groove. Therefore, at this time, the fluid in the second chamber enters the first chamber after passing through the throttle hole, the labyrinth groove, and the first flow channel. Therefore, when the piston rod is subjected to external force, it will encounter greater resistance than when it is not subjected to external force. Therefore, when the piston rod is subjected to external force in the compression direction, it will still not undergo a rapid compression process. In summary, the damper of the present application enables the piston rod to have a good damping effect regardless of whether it is subjected to external force in the compression direction.

[0006] According to some embodiments of the present invention, the labyrinth groove is provided on a side of the first component facing the gasket.

[0007] According to some embodiments of the present invention, the labyrinth groove includes an arcuate groove and a transition groove. One end of the arcuate groove is connected to the throttling hole, and the other end is connected to the transition groove. The transition groove passes through the outer edge of the first component along the radial direction of the first component to connect to the first flow channel.

[0008] According to some embodiments of the present invention, the end surface of the first component facing the gasket is perpendicular to the axis of the piston rod, and the end of the gasket close to the first component is a frustum portion, which is frustum-shaped and has an outer diameter that gradually decreases as it approaches the first component, and a gap is formed between the side surface of the frustum portion and the end surface of the first component close to the gasket.

[0009] According to some embodiments of the present invention, the piston assembly further includes a second piston member, which is disposed on a side of the second component away from the first component and avoids the throttle hole. The sealing ring is located between the first component and the second piston member.

[0010] According to some embodiments of the present invention, the first piston member further includes a third component, which is arranged on a side of the second member away from the first member, the second piston member is clamped on the third component, and the first piston member is fixed to the first end of the piston rod.

[0011] According to some embodiments of the present invention, a throttle hole is provided axially through the first component, a second flow channel is formed between the sealing ring and the second component, and the second flow channel is connected to the throttle hole.

[0012] According to some embodiments of the present invention, the second piston member is provided with a plurality of avoidance holes along the circumferential direction, and the avoidance holes are connected to the second chamber and the second flow channel.

[0013] According to some embodiments of the present invention, an elastic member and a sealing assembly are also included. The sealing assembly and the elastic member are both located in the cylinder and are sequentially sleeved on the side of the piston rod near the second end. A third chamber is formed between the end of the cylinder near the second end and the sealing assembly. The first chamber is formed between the sealing assembly and the piston assembly. The first chamber and the second chamber constitute an oil cylinder for sealing fluid. The two ends of the elastic member are respectively connected to the end of the cylinder near the second end and the sealing assembly, and are used to provide an elastic force to push the sealing assembly away from the second end, so as to compensate for the change in the volume of the cylinder when the piston rod extends out of or into the cylinder.

[0014] According to some embodiments of the present invention, a guide assembly is further included. The guide assembly is arranged at one end of the cylinder barrel close to the second end. The piston rod is slidably connected to the guide assembly. The elastic member connects the guide assembly and the sealing 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. BRIEF DESCRIPTION OF THE DRAWINGS

[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 damper of the present utility model;

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

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

[0020] Figure 4 for Figure 1 Schematic diagram of the structure of the piston rod and piston assembly in the damper shown in;

[0021] Figure 5 for Figure 1 An exploded view of the piston assembly in the damper shown in FIG;

[0022] Figure 6 for Figure 1 Exploded view of another perspective of the piston assembly in the damper shown in Figure .

[0023] Reference numerals:

[0024] Cylinder 100; first chamber 101; second chamber 102; third chamber 103; piston rod 200; first end 201; second end 202; piston assembly 300; gasket 310; first piston member 320; first component 321; throttle hole 3211; labyrinth groove 3212; arcuate groove 3213; transition groove 3214; second component 322; third component 323; sealing ring 330; second piston member 340; avoidance hole 341; elastic member 400; sealing assembly 500; guide assembly 600; gap 710; first flow channel 720; second flow channel 730. DETAILED DESCRIPTION

[0025] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0026] In the description of this application, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships 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, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0027] In the description of this application, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0028] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0029] In the description of this application, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0030] Reference below Figures 1 to 6 The damper according to the embodiment of the present invention is described.

[0031] like Figures 1 to 5As shown, the damper according to the embodiment of the present invention includes: a cylinder 100, a piston rod 200 and a piston assembly 300. A sealed chamber is formed inside the cylinder 100; the first end 201 of the piston rod 200 is slidably connected to the cylinder 100, and the second end 202 of the piston rod 200 is located outside the cylinder 100; the piston assembly 300 is provided at the first end 201 of the piston rod 200 and includes a gasket 310, a first piston member 320 and a sealing ring 330. The piston assembly 300 divides the chamber into two parts according to the The first chamber 101 and the second chamber 102 are further away from the second end 202. The first piston member 320 includes a first component 321 and a second component 322. The gasket 310, the first component 321 and the second component 322 are sequentially arranged along the side away from the second end 202. The size of the circle where the outer circumference of the second component 322 is smaller than the size of the circle where the outer circumference of the first component 321 is located. The sealing ring 330 is sleeved on the second component 322. The first piston member 320 is provided with a through throttle hole 3211. The first piston member 32 A labyrinth groove 3212 is provided between the first component 321 and the gasket 310, the labyrinth groove 3212 communicates with the first chamber 101 and the throttle hole 3211, a gap 710 is further provided between the first component 321 and the gasket 310, a first flow channel 720 is formed between the gasket 310 and the cylinder 100, the first flow channel 720 communicates with the first chamber 101 and the gap 710, and the first flow channel 720 communicates with the first chamber 101 and the labyrinth groove 3212; when the piston rod 200 is not compressed by an external force, the flow in the second chamber 102 is The fluid passes through the throttle hole 3211, the gap 710 and the first flow channel 720 in sequence and enters the first chamber 101. When the piston rod 200 is compressed by an external force, the first component 321 is deformed and can fit tightly against the gasket 310 to eliminate the gap 710. The fluid in the second chamber 102 passes through the throttle hole 3211, the labyrinth groove 3212 and the first flow channel 720 in sequence and enters the first chamber 101. The resistance effect of the labyrinth groove 3212 on the fluid is greater than the resistance effect of the gap 710 on the fluid.

[0032] It can be understood that the damper includes a cylinder 100, a piston rod 200 and a piston assembly 300. The piston assembly 300 is arranged at the first end 201 of the piston rod 200 and can slide in the cylinder 100 as the piston rod 200 extends and contracts. The second end 202 of the piston rod 200 is located outside the cylinder 100. The piston assembly 300 forms a first chamber 101 close to the second end 202 and a second chamber 102 away from the second end 202 on both sides of the cylinder 100. The piston assembly 300 includes a gasket 310, a first piston member 320 and a sealing ring 330. The first piston member 320 includes a first component 321 and a second component 322. The gasket 310, the first component 321 and the second component 322 are respectively away from the second end 202. The end 202 is provided, and the size of the circle where the outer circumference of the second component 322 is smaller than the size of the circle where the circumference of the first component 321 is located. Therefore, the sealing ring 330 is sleeved on the second component 322, and during the compression process of the piston rod 200, the sealing ring 330 seals the gap between the outer edge of the first component 321 and the inner wall of the cylinder 100. The first piston member 320 is provided with a through throttle hole 3211, and a first flow channel 720 is formed between the outer edge of the gasket 310 and the inner wall of the cylinder 100. A gap 710 is provided between the gasket 310 and the first component 321. The first flow channel 720 communicates with the first chamber 101 and the gap 710, and the throttle hole 3211 communicates with the gap 710 and the second chamber 102. In addition, a labyrinth is also provided between the gasket 310 and the first component 321. Groove 3212, the labyrinth groove 3212 connects the first flow channel 720 and the throttle hole 3211; when in use, during the compression process of the piston rod 200, when the piston rod 200 is not subject to external force or is subjected to a small external force in the compression direction, since the resistance of the gap 710 to the fluid is less than the resistance of the labyrinth groove 3212 to the fluid, the fluid in the second chamber 102 will pass through the throttle hole 3211 and directly flow into the first flow channel 720 through the gap 710, thereby entering the first chamber 101, and the resistance encountered by the fluid in this process is not large; and during the compression process, when the piston rod 200 is subjected to a large external force in the compression direction of the piston rod 200, the sealing ring 330 squeezes the outer edge of the first component 321 and causes the outer edge of the first component 321 to move toward the gasket 310 is deformed in the direction of the first component 321 and the gasket 310, so that the gap 710 between the first component 321 and the gasket 310 disappears. At this time, the throttle hole 3211 can only be connected to the first flow channel 720 through the labyrinth groove 3212. Therefore, at this time, the fluid in the second chamber 102 enters the first chamber 101 after passing through the throttle hole 3211, the labyrinth groove 3212 and the first flow channel 720. Therefore, when the piston rod 200 is compressed by an external force, it will encounter greater resistance than when it is not subjected to external force. Therefore, when the piston rod 200 is subjected to external force in the compression direction, it will still not undergo a rapid compression process; in summary, the damper of the present application enables the piston rod 200 to have a good damping effect regardless of whether it is subjected to external force in the compression direction.

[0033] It is understood that the labyrinth groove 3212 is provided on the side of the first component 321 facing the gasket 310. For example, Figure 5 As shown, in this embodiment, the labyrinth groove 3212 is arranged on a side of the first component 321 facing the gasket 310. In some other embodiments, the labyrinth groove 3212 can also be arranged on a side of the gasket 310 facing the first component 321, or even on two opposite sides of the gasket 310 and the first component 321 to jointly form the labyrinth groove 3212.

[0034] It can be understood that the labyrinth groove 3212 includes an arcuate groove 3213 and a transition groove 3214. One end of the arcuate groove 3213 is connected to the throttle hole 3211, and the other end is connected to the transition groove 3214. The transition groove 3214 passes through the outer edge of the first component 321 along the radial direction of the first component 321 to connect to the first flow channel 720. Figure 5 As shown, in this embodiment, the labyrinth groove 3212 includes an arc groove 3213 and a transition groove 3214 that are connected to each other. The transition groove 3214 is connected to the throttling hole 3211 through the arc groove 3213, and the transition groove 3214 radially penetrates the outer edge of the first component 321 along the side of the first component 321 close to the gasket 310. Therefore, when the outer edge of the first component 321 is deformed toward the gasket 310 under the pressure of the sealing ring 330, the gap 710 disappears, but the fluid in the throttling hole 3211 can flow into the first flow channel 720 through the arc groove 3213 and the transition groove 3214 in turn. The arc groove 3213 can effectively increase the resistance to the fluid. Specifically, the change in resistance can be achieved by changing the length and cross-sectional area of ​​the arc groove 3213.

[0035] It can be understood that the end surface of the first component 321 facing the gasket 310 is perpendicular to the axis of the piston rod 200, and the end of the gasket 310 close to the first component 321 is a frustum portion, which is frustum-shaped and has an outer diameter that gradually decreases as it approaches the first component 321. The gap 710 is formed between the side surface of the frustum portion and the end surface of the first component 321 close to the gasket 310. For example, Figure 3 As shown, in this embodiment, one end of the gasket 310 close to the first component 321 is a truncated cone portion, and a gap 710 is formed between the circumferential side surface of the truncated cone portion and the first component 321 .

[0036] It should be understood that in addition to setting the end of the gasket 310 close to the first part 321 to be truncated into a cone shape in the above embodiment, in other embodiments, the end of the first part 321 close to the gasket 310 can also be set to be truncated into a cone shape to form a gap 710 between the gasket 310 and the first part 321.

[0037] It is understood that the piston assembly 300 further includes a second piston member 340, which is disposed on a side of the second component 322 away from the first component 321 and avoids the throttle hole 3211. The sealing ring 330 is located between the first component 321 and the second piston member 340. For example, Figures 1 to 3 As shown, in this embodiment, the second piston member 340 stops at the side of the sealing ring 330 away from the first member 321, so that during the extension process of the piston rod 200, the sealing ring 330 is limited by the second piston member 340, and the second piston member 340 avoids the throttle hole 3211, so that the second chamber 102 and the throttle hole 3211 can be smoothly connected.

[0038] It is understandable that the first piston member 320 further includes a third member 323, the third member 323 is provided on the side of the second member 322 away from the first member 321, the second piston member 340 is clamped and sleeved on the third member 323, and the first piston member 320 is fixed to the first end 201 of the piston rod 200. For example, Figures 2 to 3 As shown, in this embodiment, the first piston member 320 also includes a third member 323 located on the side of the second member 322 away from the first member 321, and the second piston member 340 is clamped and fixed to the third member 323, so that the second piston member 340 can be fixed to the piston rod 200 through the first piston member 320.

[0039] It can be understood that the throttle hole 3211 is provided axially through the first component 321, and a second flow channel 730 is formed between the sealing ring 330 and the second component 322, and the second flow channel 730 is connected to the throttle hole 3211. Figure 3 As shown, in this embodiment, the throttle hole 3211 passes through the first component 321 , and a second flow channel 730 is formed between the second component 322 and the sealing ring 330 , so that the throttle hole 3211 can communicate with the second chamber 102 through the second flow channel 730 .

[0040] It is understandable that the second piston member 340 is provided with a plurality of avoidance holes 341 along the circumference, and the avoidance holes 341 are connected to the second chamber 102 and the second flow channel 730. Figures 3 to 5 As shown, in this embodiment, the second piston member 340 is provided with an avoidance hole 341 along the circumferential direction, and the avoidance hole 341 connects the second flow channel 730 and the second chamber 102 . At the same time, the outer edge of the second piston member 340 can also play a role in limiting the sealing ring 330 .

[0041] It is understandable that it also includes an elastic member 400 and a sealing assembly 500. The sealing assembly 500 and the elastic member 400 are both located in the cylinder 100 and are sequentially sleeved on the side of the piston rod 200 close to the second end 202. A third chamber 103 is formed between the end of the cylinder 100 close to the second end 202 and the sealing assembly 500. The first chamber 101 is formed between the sealing assembly 500 and the piston assembly 300. The first chamber 101 and the second chamber 102 constitute an oil cylinder for sealing fluid. The two ends of the elastic member 400 are respectively connected to the end of the cylinder 100 close to the second end 202 and the sealing assembly 500, and are used to provide an elastic force to push the sealing assembly 500 away from the second end 202, so as to compensate for the change in the volume of the oil cylinder when the piston rod 200 extends out of or into the oil cylinder. For example, Figure 2 As shown, in this embodiment, an elastic member 400 and a sealing assembly 500 are further provided between the end of the cylinder 100 near the second end 202 and the piston assembly 300. The elastic member 400 connects the end of the cylinder 100 near the second end 202 and the sealing assembly 500. The elastic member 400 and the sealing assembly 500 are respectively sleeved on the piston rod 200. A first chamber 101 is formed between the sealing assembly 500 and the piston assembly 300. A third chamber 103 is formed between the end of the cylinder 100 near the second end 202 and the sealing assembly 500. The first chamber 101 and the second chamber 102 are oil cylinders for containing oil. Since the piston rod 200 itself occupies a certain volume, when the piston rod 200 is compressed, the sum of the volumes of the first chamber 101 and the second chamber 102 for containing the oil increases. At this time, the sealing assembly 500 can move toward the direction close to the elastic member 400 and compress the elastic member 400; and when the piston rod 200 extends out of the cylinder 100 and moves, the sum of the volumes of the first chamber 101 and the second chamber 102 for containing the oil decreases. At this time, the sealing assembly 500 can move in the direction away from the elastic member 400 under the action of the elastic force of the elastic member 400 to compensate for the volume of the extended piston rod 200; therefore, the elastic member 400 and the sealing assembly 500 play a role in compensating for the change in the volume of the cylinder during the extension and retraction of the piston rod 200.

[0042] It is understood that the guide assembly 600 is further included. The guide assembly 600 is provided at one end of the cylinder 100 close to the second end 202. The piston rod 200 is slidably connected to the guide assembly 600. The elastic member 400 connects the guide assembly 600 and the sealing assembly 500. For example, Figure 2 As shown, in this embodiment, a guide assembly 600 is further provided at one end of the cylinder 100 close to the second end 202 , and the piston rod 200 is slidably connected to the guide assembly 600 , so that the guide assembly 600 plays a guiding role for the piston rod 200 .

[0043] The embodiments of the present application have been described in detail above with reference to the accompanying drawings. However, the present application is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present application. In addition, the embodiments of the present application and the features of the embodiments can be combined with each other unless there is a conflict.

Claims

1. A damper, characterized in that: include: A cylinder barrel, which forms a sealed chamber inside; A piston rod, wherein a first end of the piston rod is slidably connected to the cylinder barrel, and a second end of the piston rod is located outside the cylinder barrel; A piston assembly is provided at the first end of the piston rod and includes a gasket, a first piston member and a sealing ring, the piston assembly divides the chamber into a first chamber and a second chamber which are sequentially away from the second end, the first piston member includes a first component and a second component, the gasket, the first component and the second component are sequentially arranged along a side away from the second end, the size of the circle where the outer circumference of the second component is smaller than the size of the circle where the outer circumference of the first component is, the sealing ring is sleeved on the second component, the first piston member is provided with a through throttling hole, a labyrinth groove is provided between the first piston member and the gasket, the labyrinth groove connects the first chamber and the throttling hole, a gap is further provided between the first component and the gasket, a first flow channel is formed between the gasket and the cylinder barrel, the first flow channel connects the first chamber and the gap, and the first flow channel connects the first chamber and the labyrinth groove; When the piston rod is not compressed by external force, the fluid in the second chamber passes through the throttling hole, the gap and the first flow channel in sequence to enter the first chamber. When the piston rod is compressed by external force, the first component is deformed and can be tightly attached to the gasket to make the gap disappear. The fluid in the second chamber passes through the throttling hole, the labyrinth groove and the first flow channel in sequence to enter the first chamber. The resistance effect of the labyrinth groove on the fluid is greater than the resistance effect of the gap on the fluid.

2. The damper according to claim 1, characterized in that The labyrinth groove is arranged on a side of the first component facing the gasket.

3. The damper according to claim 2, characterized in that: The labyrinth groove includes an arc groove and a transition groove. One end of the arc groove is connected to the throttling hole, and the other end is connected to the transition groove. The transition groove passes through the outer edge of the first component in the radial direction of the first component to connect to the first flow channel.

4. The damper according to claim 1, characterized in that: The end surface of the first component facing the gasket is perpendicular to the axis of the piston rod, and the end of the gasket close to the first component is a frustum portion, which is frustum-shaped and has an outer diameter that gradually decreases as it approaches the first component, and the gap is formed between the side surface of the frustum portion and the end surface of the first component close to the gasket.

5. The damper according to claim 1, characterized in that: The piston assembly also includes a second piston member, which is arranged on a side of the second component away from the first component and avoids the throttle hole. The sealing ring is located between the first component and the second piston member.

6. The damper according to claim 5, characterized in that The first piston member also includes a third component, which is arranged on a side of the second member away from the first member, the second piston member is clamped and sleeved on the third component, and the first piston member is fixedly arranged on the first end of the piston rod.

7. The damper according to claim 5, characterized in that The throttling hole is arranged to penetrate the first component in the axial direction, and a second flow channel is formed between the sealing ring and the second component, and the second flow channel is connected to the throttling hole.

8. The damper according to claim 7, characterized in that The second piston member is provided with a plurality of avoidance holes along the circumferential direction, and the avoidance holes are connected with the second chamber and the second flow channel.

9. The damper according to claim 1, characterized in that It also includes an elastic member and a sealing assembly, wherein the sealing assembly and the elastic member are both located in the cylinder and are sequentially sleeved on one side of the piston rod close to the second end, a third chamber is formed between the end of the cylinder close to the second end and the sealing assembly, the first chamber is formed between the sealing assembly and the piston assembly, the first chamber and the second chamber constitute an oil cylinder for sealing the fluid, the two ends of the elastic member are respectively connected to the end of the cylinder close to the second end and the sealing assembly, and are used to provide an elastic force to push the sealing assembly away from the second end, so as to compensate for the change in the volume of the cylinder when the piston rod extends out of or into the cylinder.

10. The damper according to claim 9, characterized in that It also includes a guide assembly, which is arranged at one end of the cylinder barrel close to the second end, the piston rod is slidably connected to the guide assembly, and the elastic member connects the guide assembly and the sealing assembly.

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