A low-damping seal ring, damper

Abstract

The present application relates to a kind of low-damping sealing ring, damper, low-damping sealing ring includes root and outwardly expanding sealing portion, recess is provided in the middle of the sealing portion, the outer wall of the sealing portion is provided with lip, the flared of the recess is outwardly expanded and forms opening angle a, the cross-sectional wall thickness of the sealing portion is b, cross-sectional wall height is h1, the range of opening angle a is 7-30 °, the value range of b / h1 is 2-5.In addition, the damper of the present application applies the above-mentioned sealing ring, the low-damping sealing ring of the present application is used on damper, can play the role of one-way sealing, can increase the buffer resistance of damper, reduces reset resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electromagnetic valves, in particular to a low-damping sealing ring and damper applied to an electromagnetic valve. BACKGROUND

[0002] The damper is a device for providing resistance to movement and reducing the energy of movement. The structure of the damper on the electromagnetic valve is similar to that of the hydraulic cylinder, which includes a housing assembly and a piston assembly. The housing assembly includes an outer housing and a cover, the outer housing is provided with a sliding cavity filled with liquid, and the cover seals the sliding cavity. The piston assembly includes a piston body, a push rod and an elastic member. The piston body is movably arranged in the sliding cavity, which divides the space into two parts, and a gap is left between the piston body and the sliding cavity side wall. One end of the push rod is fixedly connected with the piston body, and the other end extends outward through the cover. The cover is provided with a through hole matched with the push rod. The elastic member is arranged between the sliding cavity and the upper side of the piston body to provide a reset elastic force for the piston body. The movement sealing structure of the piston part mainly has two structural forms: ① The outer housing and the piston are matched with a small gap, and the small gap is used to realize the sealing of the liquid under high pressure. This structure has small piston movement resistance, but the matching gap requirement is very high, and the processing is difficult, so the cost is high. ② The O-ring structure is purchased, the O-ring is installed on the piston, and the O-ring is used to realize the sealing of the liquid. Compared with the above method, the cost is lower, but the piston reset speed of this sealing method is slow, which affects the practicability.

[0003] The applicant found that, by using the O-ring sealing method, when the piston body is reset, the piston body will be subjected to the resistance of the liquid, so that the elastic member cannot push the piston to reset quickly and stably, thereby causing the above problems. Therefore, the present application is proposed to solve the above problems. SUMMARY

[0004] The first invention of the present application aims to overcome the slow reset speed problem of the damper in the prior art when using the O-ring sealing method, and provides a low-damping sealing ring.

[0005] To achieve the above invention purposes, the present application adopts the following technical solutions:

[0006] The low-damping sealing ring comprises a root part and a sealing part extending outwardly, a recess is arranged in the middle of the sealing part, a lip is arranged on the outer wall of the sealing part, the flared end of the recess is expanded outwardly to form an opening angle a, the cross-sectional wall thickness of the sealing part is b, the cross-sectional wall height is h1, the opening angle a is in the range of 7-30°, and the value of b / h1 is in the range of 2-5.

[0007] The low-damping sealing ring of the application can be applied to the damper of an electromagnetic valve, and is used for sealing the gap between the piston body and the side wall of the damper liquid cavity. Since the middle part of the sealing part is provided with a groove and the flared portion of the groove expands from inside to outside, the pre-pressing force of the sealing ring on the lip makes the sealing ring fit and seal, when the sealing ring moves upward with the piston, it is expanded by extrusion and forms lateral pressure outward, preventing the liquid from overflowing to the lower side of the liquid cavity through the gap between them, so that the damper keeps upward resistance, when it moves reversely with the piston, the flared portion is deformed inward by the force in the other direction, so that the liquid can overflow to the upper side of the liquid cavity through the gap between the sealing ring and the slide cavity side wall, thereby accelerating the liquid return speed and accelerating the reset, thereby realizing one-way sealing, therefore, it has the effects of increasing the buffer resistance and reducing the reset resistance. In the application, the range of the opening angle a is 7-30°, and the value range of b / h1 is 2-5. Within this range, the upper limit of the size of the pre-pressing force plus the hydraulic pressure does not affect the piston reset speed, and the lower limit ensures one-way zero leakage of the sealing ring.

[0008] Further, the lip is semispherical. When the sealing ring is deformed, the lip will swing with it. The present scheme can make the lip keep linear contact with the side wall of the liquid cavity during the swinging process, thereby controlling the contact area within the minimum range.

[0009] Further, the cross-sectional height of the sealing ring is H, the width is B, and H / B>0.5. The design of the present scheme can prevent the sealing ring from turning over downward from both sides.

[0010] Further, the upper side of the flared portion is provided with an inclined surface. The setting of the present scheme can make the flared portion expand to both sides when the sealing ring moves upward with the piston.

[0011] Another object of the application is to provide a damper, which comprises a shell and a piston assembly, the shell is provided with a slide cavity, the piston assembly is arranged in the slide cavity and can slide up and down, the piston assembly is provided with the sealing ring of the above scheme, the lip of the sealing ring abuts against the inner wall of the slide cavity and makes the sealing part deform inward, when the piston assembly moves upward, the flared portion of the sealing ring applies lateral pressure to the lip under the action of hydraulic pressure, the flared portion of the groove expands, when the piston assembly moves downward, the flared portion of the groove restores.

[0012] The damper of the application has all the advantages of the above scheme because it applies the sealing ring of the above scheme. Compared with the smaller gap fitting mode, it has lower requirements for the machining precision of parts, the gap value can be adjusted within a wide range, therefore, it is easier to process and assemble and has lower cost, and compared with the O-ring sealing mode, it has smaller reset resistance, faster reset speed and strong practicability.

[0013] Further, the piston assembly comprises a piston body, a peripheral wall of the piston body is provided with a groove, the groove has a depth H2, a width B1, a root cross-sectional width C, and a lip cross-sectional width r, H2 is in a range of 1.05H-1.1H, and B1=2r+C. In the scheme, the range of B1 can compress the sealing ring's opening angle a to 0°, which is beneficial to reduce the reset resistance, and the range of H2 can make the sealing ring have a gap in the height direction of the groove.

[0014] Further, the liquid flow adjusting assembly is further provided, the shell comprises an outer shell and a cover, the sliding cavity is arranged on the outer shell and penetrates the lower end of the outer shell, the cover seals the lower end of the sliding cavity, the outer shell is further provided with a liquid flow cavity which is open at the upper end, the upper side of the liquid flow cavity and the upper side of the sliding cavity are communicated, and the lower side of the liquid flow cavity and the lower side of the sliding cavity are communicated; the piston assembly further comprises a push rod and a first elastic member, the piston body is longitudinally movably arranged in the sliding cavity, the sliding cavity is divided into an upper cavity and a lower cavity by the piston body, and a gap is left between the piston body and the side wall of the sliding cavity, the upper side of the push rod is fixedly connected with the piston body, and the lower side of the push rod extends outward through the cover, the cover is provided with a through hole matched with the push rod, and the first elastic member is arranged between the upper side of the sliding cavity and the piston body; the liquid flow adjusting assembly is assembled into the liquid flow cavity from the upper side and seals the upper end opening of the liquid flow cavity; the push rod drives the piston body to move upward under the action of an external force, the sealing ring seals the gap between the piston body and the sliding cavity, the liquid in the upper cavity only flows into the lower cavity through the liquid flow cavity, and the liquid flow adjusting assembly controls the flow rate of the liquid; when the external force disappears, the piston body is reset downward under the action of the first elastic member, the liquid in the lower cavity can flow into the upper cavity through the liquid flow cavity, and can overflow from the gap between the piston body and the sliding cavity to the upper cavity.

[0015] Further, the sealing washer and a second elastic member are further provided, the piston body is provided with a longitudinal overflow hole, the upper side of the piston body is provided with a blocking portion for limiting the second elastic member from separating from the piston body, and the sealing washer is pressed on the piston body by the second elastic member to seal the overflow hole.

[0016] When the piston body moves upward, the elastic force of the second elastic member and the pressure of the liquid in the upper cavity make the sealing washer tightly press on the piston body to seal the overflow hole, when the piston body moves downward, the pressure on the sealing washer is reduced, the pressure of the liquid in the lower cavity is relatively large, and thus the sealing washer is pushed upward to form a gap with the overflow hole, so that the liquid in the lower cavity can flow into the upper cavity through the overflow hole. In this way, when resetting, the liquid in the lower cavity flows to the upper cavity through the liquid flow cavity, the gap between the piston body and the side wall of the sliding cavity, and the overflow hole, so as to accelerate the reset.

[0017] Further, the liquid flow adjusting assembly comprises a needle mounting cylinder and an adjusting needle, the needle mounting cylinder is provided with an open-top needle mounting groove, a gap exists between the outer periphery of the needle mounting cylinder and the liquid flow cavity, and a sealing protrusion is arranged around the outer periphery of the needle mounting cylinder to seal the gap between the needle mounting cylinder and the side wall of the liquid flow cavity, the upper through hole and the lower through hole are arranged on the upper side and the lower side of the sealing protrusion respectively, and the adjusting needle is assembled in the needle mounting groove. In this scheme, the sealing protrusion of the needle mounting cylinder separates the upper side and the lower side of the liquid flow cavity, prevents the liquid from flowing directly from the upper side to the lower side of the liquid flow cavity, sets the upper through hole for connecting with the upper cavity, sets the lower through hole for connecting with the lower cavity, thereby forming a channel for the liquid flow, and then adjusts the opening degree of the lower through hole through the adjusting needle, so as to control the liquid flow rate of the channel. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a sectional view of the sealing ring;

[0019] Figure 2 is an enlarged view of a partial section of the sealing ring;

[0020] Figure 3 is a sectional view of the damper;

[0021] Figure 4 is an enlarged view of A of Figure 3 ;

[0022] Figure 5 is a sectional view of the damper;

[0023] Figure 6 is an enlarged view of B of Figure 5 ;

[0024] Figure 7 is an enlarged view of a partial section of the sealing ring and the damper assembled together.

[0025] REFERENCE NUMERALS:

[0026] damper 1, liquid flow adjusting assembly 3, outer shell 11, cover 12, liquid flow cavity 14, upper cavity 131, lower cavity 132, first connecting through hole 133, second connecting through hole 134, overflow hole 15, piston body 21, connecting groove 211, blocking part 212, push rod 22, first elastic member 23, groove 24, needle mounting cylinder 31, needle mounting groove 311, adjusting needle 32, sealing protrusion 33, upper through hole 34, lower through hole 35, sealing ring 4, recess 41, lip 42, root 43, sealing part 44, sealing washer 5, second elastic member 51. DETAILED DESCRIPTION

[0027] The technical scheme of the present application will be further described below in combination with the drawings:

[0028] In the description of the present application, it should be understood that the "upper", "lower", "lateral", "longitudinal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. The fixed connection described in the present application includes screw connection, riveting and other conventional fixed connection methods.

[0029] Referring to Figures 1-6 As shown in the drawings, the present application discloses a low-damping sealing ring 4, which comprises a root 43 and a sealing part 44 extending outwardly, a recess 41 is arranged in the middle of the sealing part 44, a lip 42 is arranged on the outer wall of the sealing part 44, the flared opening of the recess 41 expands from inside to outside to form an opening angle a, so that the sealing ring 4 has a pre-pressure on the lip 42, the cross-sectional wall thickness of the sealing part 44 is b, and the cross-sectional wall height is h1. In order to make the upper limit of the pre-pressure of the sealing ring 4 plus the hydraulic pressure not affect the reset speed of the piston, and the sealing ring 4 has one-way zero leakage after assembly, the range of the opening angle a is 7-30°, and the value range of b / h1 is 2-5.

[0030] In order to control the contact area within the minimum range, the above-mentioned lip 42 is in the shape of a hemisphere. Since the lip 42 swings with the deformation of the sealing ring 4, the present scheme can make the lip 42 swing around the center O1 of the intersection of the outer wall of the sealing part 44 and the root 43 during the swinging process, and always maintain linear contact with the liquid cavity and the piston.

[0031] Since the sealing ring 4 expands outwardly from both sides of the flared opening when it is subjected to downward pressure, in order to prevent the sealing ring 4 from turning downwardly from both sides, the cross-sectional height of the sealing ring 4 is H, the width is B, and H / B>0.5. When the sealing ring 4 moves upwardly with the piston, the flared opening expands to both sides, and the upper side of the flared opening is provided with an inclined surface. Since the flared opening is subjected to downward pressure when the sealing ring 4 moves upwardly, the inclined surface arranged on the upper side of the flared opening has a guiding effect, so that the flared opening expands to both sides without deforming inwardly.

[0032] The sealing ring 4 of the present application can be applied to the damper of an electromagnetic valve to seal the gap between the piston body 21 and the side wall of the liquid chamber of the damper. Since the middle part of the sealing part 44 is provided with the groove 41 and the flared part of the groove 41 expands from inside to outside, the pre-pressing force of the lip 42 makes the sealing ring 4 fit to the rear end, i.e. to play the sealing role. When the sealing ring 4 moves upward with the piston, it is expanded by the extrusion and forms the lateral pressure to the outside, preventing the liquid from overflowing through the gap between the sealing ring 4 and the side wall of the liquid chamber to the lower side of the liquid chamber of the damper, so as to keep the upward resistance of the damper. When the sealing ring 4 moves reversely with the piston, the flared part is deformed inwardly by the force in the other direction, so that the liquid can overflow through the gap between the sealing ring 4 and the side wall of the liquid chamber to the upper side of the liquid chamber, thereby accelerating the liquid return speed and the reset, realizing the one-way sealing. Therefore, the sealing ring 4 has the effects of increasing the buffering resistance and reducing the reset resistance.

[0033] Embodiment two

[0034] The present embodiment discloses a damper 1 comprising a shell and a piston assembly, the shell is provided with a sliding cavity, the piston assembly is arranged in the sliding cavity and can slide up and down, the piston assembly is provided with the sealing ring 4 of the above-mentioned scheme, the lip 42 of the sealing ring 4 abuts against the inner wall of the sliding cavity and makes the sealing part 44 deform inwardly; when the piston assembly moves upwardly, the flared part of the sealing ring 4 applies the lateral pressure to the lip 42 under the hydraulic pressure, and the flared part of the groove 41 expands; when the piston assembly moves downwardly, the flared part of the groove 41 restores.

[0035] The above-mentioned piston assembly comprises a piston body 21, the outer peripheral wall of the piston body 21 is provided with a groove, the depth H2 and the width B1 of the groove, the cross-sectional width C of the root 43 and the cross-sectional width r of the lip are within the range of 1.05H-1.1H×H, so that the depth of the groove can make the sealing ring have the gap in the height direction of the groove, and B1=2r+C, so that the range of B1 can make the opening angle a of the sealing ring be compressed to 0°.

[0036] The damping device 1 has the following structure: the damping device 1 further comprises a liquid flow adjusting assembly 3, the shell comprises an outer shell 11 and a cover 12, a sliding cavity is arranged on the outer shell 11 and penetrates through the lower end of the outer shell 11, the cover 12 seals the lower end of the sliding cavity, the outer shell 11 is further provided with a liquid flow cavity 14 which is open at the upper end, the upper side of the liquid flow cavity 14 and the upper side of the sliding cavity are in communication, and the lower side of the liquid flow cavity 14 and the lower side of the sliding cavity are in communication; the piston assembly further comprises a push rod 22 and a first elastic member 23, the piston body 21 is arranged in the sliding cavity in a longitudinally movable manner, so as to divide the sliding cavity into an upper cavity 131 and a lower cavity 132, and a gap is left between the piston body 21 and the side wall of the sliding cavity, the upper side of the push rod 22 is fixedly connected with the piston body 21, the lower side of the push rod 22 extends outwardly through the cover 12, the cover 12 is provided with a through hole matched with the push rod 22, and the first elastic member 23 is arranged between the sliding cavity and the upper side of the piston body 21; the liquid flow adjusting assembly 3 is assembled into the liquid flow cavity 14 from the upper side and seals the upper end opening of the liquid flow cavity 14; the push rod 22 drives the piston body 21 to move upwardly under the action of an external force, the sealing ring 4 seals the gap between the piston body 21 and the sliding cavity, so that the liquid in the upper cavity 131 flows into the lower cavity 132 only through the liquid flow cavity 14, and the liquid flow adjusting assembly 3 controls the flow rate of the liquid; when the external force disappears, the piston body 21 is reset downwardly under the action of the first elastic member 23, so that the liquid in the lower cavity 132 can flow into the upper cavity 131 through the liquid flow cavity 14 and can overflow from the gap between the piston body 21 and the sliding cavity to the upper cavity 131.

[0037] In order to improve the backflow speed of the liquid during reset, the damping device 1 further comprises a sealing washer 5 and a second elastic member 51, the piston body 21 is provided with a longitudinally penetrating overflow hole 15, and the upper side of the piston body 21 is provided with a blocking portion 212 for limiting the second elastic member 51 from being separated from the piston body 21, and the sealing washer 5 is pressed against the piston body 21 by the second elastic member 51 to seal the overflow hole 15. When the piston body 21 moves upwardly, the second elastic member 51 and the pressure of the liquid in the upper cavity 131 make the sealing washer 5 tightly press against the piston body 21 to seal the overflow hole 15, when the piston body 21 moves downwardly, the sealing washer 5 is subjected to the pressure of the liquid in the lower cavity 132 and the decreasing pressure, so that the sealing washer 5 is pushed upwardly to form a gap between the sealing washer 5 and the overflow hole 15, and the liquid in the lower cavity 132 can flow into the upper cavity 131 from the overflow hole 15. In this way, during reset, the liquid in the lower cavity 132 flows to the upper cavity 131 from the liquid flow cavity 14, the gap between the piston body 21 and the side wall of the sliding cavity and the overflow hole 15, so as to accelerate the reset.

[0038] The liquid flow adjusting assembly 3 comprises a needle mounting cylinder 31 and an adjusting needle 32. The needle mounting cylinder 31 is provided with an open-top needle mounting groove 311. There is a gap between the outer periphery of the needle mounting cylinder 31 and the liquid flow cavity 14. A sealing protrusion 33 is arranged around the outer periphery of the needle mounting cylinder 31 to seal the gap between the needle mounting cylinder 31 and the side wall of the liquid flow cavity 14. The needle mounting groove 311 is provided with an upper through hole 34 and a lower through hole 35 on the upper side and the lower side of the sealing protrusion 33 respectively. The adjusting needle 32 is assembled in the needle mounting groove 311 to adjust the opening of the lower through hole 35. In this scheme, the sealing protrusion 33 of the needle mounting cylinder 31 separates the upper side and the lower side of the liquid flow cavity 14, preventing the liquid from flowing directly from the upper side to the lower side of the liquid flow cavity 14. The upper through hole 34 is arranged to be connected with the upper cavity 131, and the lower through hole 35 is arranged to be connected with the lower cavity 132, thereby forming a channel for the liquid to flow. The space between the upper through hole 34 and the lower through hole 35 is adjusted by the adjusting needle 32, thereby controlling the liquid flow rate of the channel.

[0039] The upper side of the piston body 21 is provided with a connecting groove 211. The lower side of the first elastic member 23 is located in the connecting groove 211. The blocking portion 212 is located in the middle of the connecting groove 211.

[0040] As a further optimization of the scheme, the first elastic member 23 and the second elastic member 51 are springs.

[0041] The upper side of the sliding cavity is provided with a first connecting through hole 133 for connecting the liquid flow cavity 14. The lower side is provided with a second connecting through hole 134 for connecting the liquid flow cavity 14.

[0042] The sealing protrusion 33 is arranged close to the bottom of the needle mounting cylinder 31. The lower through hole 35 is arranged at the bottom of the sealing mounting cylinder. The upper through hole 34 is arranged at the lower side of the needle mounting hole. In this scheme, the sealing protrusion 33 and the upper through hole 34 are both arranged at the lower side of the needle mounting cylinder 31, so as to seal the upper side of the needle mounting cylinder 31.

[0043] Workflow:

[0044] ① Damping process: as shown in Figure 5 , an external force acts on the push rod 22, pushing the push rod 22 upward. The push rod 22 pushes the piston body 21 upward while compressing the first elastic member 23. The liquid generates pressure, causing the sealing ring 4 to expand. The sealing between the sealing ring 4 and the sliding cavity prevents the liquid from passing through. The liquid flows into the lower cavity through the liquid flow cavity 14 on the outer housing. The piston moves slowly upward. The speed of the piston body 21 depends on the gap size of the needle mounting cylinder 31 and the adjusting needle 32.

[0045] ② Reset process: as shown in Figure 7As shown, when the external force on the push rod 22 disappears, the piston body 21 moves downward under the action of the first elastic member, the sealing ring 4 is deformed inward under the upward pressure of the liquid, and the liquid flows back to the upper cavity 131 through the gap between the sealing ring 4 and the sliding cavity, the overflow hole 15 and the liquid flow cavity 14, thereby achieving rapid resetting of the piston assembly; or, the liquid flows back to the upper cavity 131 through the gap between the sealing ring 4 and the sliding cavity and the overflow hole 15.

[0046] The damper 1 of the embodiment has all the advantages of the sealing ring 4 of the above-mentioned scheme. Compared with the smaller gap fitting mode, the damper 1 has lower requirements for the machining precision of parts, a wide adjustable range of the gap value, easier processing and assembly, lower cost, smaller resetting resistance, faster resetting speed and stronger practicability.

[0047] According to the disclosure and teaching of the above description, those skilled in the art of the present application can also make changes and modifications to the above embodiments. Therefore, the present application is not limited to the specific embodiments disclosed and described above, and some modifications and changes of the present application should fall within the protection scope of the claims of the present application. In addition, although some specific terms are used in the specification, these terms are only for convenience of description and do not constitute any limitation on the present application.

Claims

1. A low-damping seal ring, characterized by, The sealing ring comprises a root and a sealing part extending outwardly, a groove is arranged in the middle of the sealing part, a lip is arranged on the outer wall of the sealing part, the flared end of the groove is expanded outwardly to form an opening angle a, the cross-sectional wall thickness of the sealing part is b, the cross-sectional wall height is h1, the opening angle a is in the range of 7-30°, and the value of b / h1 is in the range of 2-5. The lip is semispherical. The cross-sectional height of the sealing ring is H, the cross-sectional width is B, and H / B>0.

5.

2. The seal ring of claim 1, wherein: The upper side of the flared end is provided with an inclined surface.

3. A damper comprising a housing and a piston assembly, said housing having a sliding cavity therein, said piston assembly being slidably disposed in said sliding cavity, characterized in that: The piston assembly is provided with the sealing ring according to any one of claims 1-2, the lip of the sealing ring abuts against the inner wall of the sliding cavity, and the sealing part is deformed inwardly. When the piston assembly moves upward, the flared end of the sealing ring applies lateral pressure to the lip under the action of hydraulic pressure, and the flared end of the groove is expanded, and when the piston assembly moves downward, the flared end of the groove returns to normal.

4. The damper of claim 3, wherein: The piston assembly comprises a piston body, a groove is arranged around the outer peripheral wall of the piston body, the depth of the groove is H2, the width is B1, the cross-sectional width of the root is C, the cross-sectional width of the lip is r, H2 is in the range of 1.05H-1.1H, and B1=2r+C.

5. The damper of claim 4, wherein: The liquid flow adjusting assembly is further provided, the shell comprises an outer shell and a cover, the sliding cavity is arranged on the outer shell and penetrates through the lower end of the outer shell, the cover seals the lower end of the sliding cavity, the outer shell is further provided with a liquid flow cavity which is open at the upper end, and the upper side of the liquid flow cavity and the lower side of the liquid flow cavity are respectively communicated with the upper side of the sliding cavity and the lower side of the sliding cavity. The piston assembly further comprises a push rod and a first elastic member, the piston body is longitudinally movable and arranged in the sliding cavity, the sliding cavity is divided into an upper cavity and a lower cavity, and a gap is left between the piston body and the side wall of the sliding cavity, the upper side of the push rod is fixedly connected with the piston body, and the lower side of the push rod extends outwardly through the cover, the cover is provided with a through hole matched with the push rod, and the first elastic member is arranged between the upper side of the sliding cavity and the piston body. The liquid flow adjusting assembly is assembled into the liquid flow cavity from the upper side and seals the upper end opening of the liquid flow cavity. Under the action of external force, the push rod pushes the piston body to move upward, the sealing ring seals the gap between the piston body and the sliding cavity, the liquid in the upper cavity flows into the lower cavity through the liquid flow cavity only, and the liquid flow adjusting assembly controls the flow rate of the liquid. When the external force disappears, the piston body is reset downward under the action of the first elastic member, the liquid in the lower cavity can flow into the upper cavity through the liquid flow cavity, and can overflow from the gap between the piston body and the sliding cavity to the upper cavity.

6. The damper of claim 4, wherein: The sealing washer and a second elastic member are further provided, the piston body is provided with a longitudinal overflow hole, the upper side of the piston body is provided with a blocking part for limiting the second elastic member from separating from the piston body, and the sealing washer is pressed against the piston body by the second elastic member to seal the overflow hole.

7. The damper of claim 5, wherein: The liquid flow adjusting assembly comprises a needle mounting cylinder and an adjusting needle, the needle mounting cylinder is provided with an open-top needle mounting groove, a gap exists between the outer periphery of the needle mounting cylinder and the liquid flow cavity, and a sealing protrusion is arranged around the outer periphery of the needle mounting cylinder to seal the gap between the needle mounting cylinder and the side wall of the liquid flow cavity, the upper through hole and the lower through hole are respectively arranged on the upper side and the lower side of the sealing protrusion.

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