CN108662062B

CN108662062B - Damper

Info

Publication number: CN108662062B
Application number: CN201810801710.2A
Authority: CN
Inventors: 何亮
Original assignee: 何亮
Current assignee: HUBEI HONGSHENGCHANG ELECTRONIC Co.,Ltd.
Priority date: 2018-06-11
Filing date: 2018-07-20
Publication date: 2020-02-07
Anticipated expiration: 2038-07-20
Also published as: CN108662062A

Abstract

The invention discloses a damper, comprising: a tubular housing; an end cap; a piston assembly comprising a piston and a rod; a seal assembly disposed between the piston and the end cap and in sliding sealing connection with the rod and the tubular housing; the reset assembly comprises a first spring and a second spring, one end of the second spring is abutted against the end cover, and the other end of the second spring is abutted against the sealing assembly; the sealing assembly and the piston divide the tubular shell into a pressure relief chamber, a pressure chamber and a storage chamber, the piston comprises a fixed part and a movable part, at least two first fluid channels communicated with the pressure chamber and the storage chamber are arranged on the fixed part, and the movable part can slide along the rod and block one first fluid channel. According to the invention, the sealing assembly and the second spring are arranged, so that the contraction and the reset of the pressure relief chamber can be realized, the sealing assembly and the second spring can be made of conventional materials, and the service life is long; the piston is composed of a fixed part and a movable part, and the movable part can block one first fluid channel on the fixed part, so that the rapid resetting of the damper is facilitated.

Description

Damper

Technical Field

The present invention relates to a damper.

Background

The chinese patent publication No. CN103201533B discloses a linear shock absorber having a compensation film with an integral sealing member, which resets a space V through elastic deformation of the compensation film, and because the middle portion of the compensation film mainly undergoes radial elastic deformation when the volume of the space V changes, the requirement on the material of the compensation film is extremely high, and the middle portion of the compensation film is easily damaged in the process of elastic deformation, which easily results in shortening the service life of the shock absorber.

Disclosure of Invention

The invention aims to overcome the technical defects and provides a damper, which solves the technical problem of short service life caused by the fact that a shock absorber adopts a compensation film to reset in the prior art.

In order to achieve the above technical object, a technical solution of the present invention provides a damper, including:

a tubular housing having one end closed and the other end open;

an end cap sealingly connected to the open end of the tubular housing;

the piston assembly comprises a piston and a rod, and the piston is arranged in the inner cavity of the tubular shell and can perform reciprocating sliding motion along the inner wall of the tubular shell; one end of the rod penetrates through the end cover and is connected with the piston;

a seal assembly, which is annular and arranged between the piston and the end cap, and whose inner and outer walls are in sliding sealing connection with the rod and the tubular housing, respectively;

the reset assembly comprises a first spring and a second spring, one end of the first spring is abutted against the end head connected with the free end of the rod, and the other end of the first spring is abutted against the end cover; the second spring is arranged in the tubular shell, one end of the second spring abuts against the end cover, and the other end of the second spring abuts against the sealing component;

wherein, seal assembly and piston will the inner chamber of tubulose casing is separated for pressure relief room, pressure chamber and storage compartment in proper order to the blind end by its open end, the piston includes a fixed part and a movable part, the fixed cover of fixed part is located the pole, just the first fluid passage of two at least intercommunication pressure chambers and storage compartments has been arranged on the fixed part, the movable part slip cap is located the pole, be provided with the second fluid passage who is connected with one of them first fluid passage in the movable part, and work as when storage compartment pressure is greater than the pressure chamber, the movable part can be followed the pole slides and blocks another one first fluid passage.

Compared with the prior art, the invention has the beneficial effects that: the sealing assembly and the second spring are respectively connected with the rod and the tubular shell in a sliding and sealing mode, so that the pressure relief chamber can be contracted and reset, the sealing assembly and the second spring can be made of conventional materials, and the service life is long; meanwhile, the piston is arranged to be composed of the fixed portion and the movable portion, and one of the first fluid channels in the fixed portion is blocked by the movable portion, so that the damper is favorable for quick reset.

Drawings

FIG. 1 is a schematic view of a first state of use of the inventive damper;

FIG. 2 is a schematic cross-sectional structural view of FIG. 1 of the invention;

FIG. 3 is a schematic view of a second state of use of the inventive damper;

FIG. 4 is a schematic cross-sectional structural view of FIG. 3 of the invention;

FIG. 5 is a schematic perspective cross-sectional structural view of the inventive seal ring;

FIG. 6 is a schematic cross-sectional perspective view of the retainer ring of the present invention;

FIG. 7 is a schematic perspective view of a position limiting member according to the present invention;

FIG. 8 is a perspective view of the fastening portion of the present invention;

FIG. 9 is a schematic view of another perspective of the fastening portion of the present invention;

FIG. 10 is a perspective view of the mobile portion of the present invention;

FIG. 11 is a schematic view of another perspective and spatial configuration of the mobile portion of the present invention;

FIG. 12 is a schematic perspective view of the inventive spacer;

FIG. 13 is a schematic view of a first state of use of the inventive damper in another embodiment;

FIG. 14 is a schematic view of a second state of use of the inventive damper in another embodiment

Fig. 15 is an enlarged view of a portion of fig. 13 of the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 to 4, the present invention provides a damper, which includes a tubular housing 10, an end cap 20, a piston assembly 30, a sealing assembly 40 and a restoring assembly 50.

The tubular housing 10 is closed at one end and open at the other end, and the end cap 20 is sealingly connected to the open end of the tubular housing 10.

The piston assembly 30 comprises a piston 31 and a rod 32, wherein the piston 31 is arranged in the inner cavity of the tubular housing 10 and can perform reciprocating sliding motion along the inner wall of the tubular housing 10; one end of the rod 32 passes through the end cap 20 and is connected to the piston 31.

The sealing assembly 40 is annular and is arranged between said piston 31 and the end cap 20, and has an inner wall and an outer wall in sliding sealing connection with said rod 32 and with the tubular housing 10, respectively.

The reset component 50 comprises a first spring 51 and a second spring 52, wherein one end of the first spring 51 is abutted against the end head 33 connected with the free end of the rod 32, and the other end is abutted against the end cover 20; the second spring 52 is disposed in the tubular housing 10 and has one end abutting against the end cap 20 and the other end abutting against the sealing member 40.

The sealing assembly 40 and the piston 31 divide the inner cavity of the tubular housing 10 from the open end to the closed end thereof into a pressure relief chamber 11, a pressure chamber 12 and a storage chamber 13 in sequence, and the piston assembly 30 is provided with at least one fluid path for communicating the storage chamber 13 with the pressure chamber 12.

In the damper of the present embodiment, as shown in fig. 3 and 4, the piston assembly 30 is driven by the pressure applied thereto to move from the open end of the tubular housing 10 to the closed end thereof, the medium stored in the reservoir chamber 13 can move into the pressure chamber 12 along the fluid path, the medium entering the pressure chamber 12 can drive the sealing assembly 40 and the rod 32 to move in opposite directions and compress the second spring 52, and when the pressure disappears, as shown in fig. 1 and 2, the piston assembly 30 moves from the closed end of the tubular housing 10 to the open end thereof under the action of the first spring 51 and the second spring 52, and the sealing assembly 40 moves in opposite directions again with respect to the piston assembly 30, so that the medium in the pressure chamber 12 flows back into the reservoir chamber 13 from the fluid path, the present embodiment replaces the existing compensating film by the cooperation of the second spring 52 and the sealing assembly 40, because the sealing assembly 40 can be made of conventional rubber material, The second spring 52 may be any elastic member with a set restoring force, and the second spring 52 and the sealing assembly 40 are both simple and easy to obtain, and have a long service life, which can greatly prolong the service life of the damper.

As shown in fig. 2, 4, 5, and 6, the sealing assembly 40 includes a sealing ring 41 and a retaining ring 42, an inner wall and an outer wall of the sealing ring 41 are respectively connected to the rod 32 and the tubular housing 10 in a sealing and sliding manner, one end of the retaining ring 42 is embedded in the sealing ring 41, and the other end of the retaining ring 42 abuts against the second spring 52, the sealing ring 41 may be made of a material, such as metal or rubber, capable of being connected to an outer peripheral surface of the rod 32 and an inner wall of the tubular housing 10 in a sliding and sealing manner, and when a material having a certain elasticity like rubber is adopted, the sealing ring 41 may be made of a material having a certain elasticity, such as rubber, preferably, and the retaining ring 42 may be made of a common metal material. When the sealing ring 41 is specifically arranged, an annular groove 411 is coaxially formed in the end face of one end of the sealing ring 41, which is opposite to the pressure relief chamber 11, in the embodiment, one end of the baffle ring 42 is embedded in the annular groove 411 in a matching manner, the cross section of the sealing ring 41 is approximately U-shaped through the arrangement of the annular groove 411, the baffle ring 42 can be arranged in a T-shaped cross section, and can be composed of a baffle ring body 421 and an inner embedded body 422, the inner embedded body 422 is embedded in the annular groove 411 in a matching manner, the upper end of the inner embedded body is connected with the baffle ring body 421, a coaxial groove 421a is coaxially formed in the end face of the baffle ring body 421, the lower end of the second spring 52 is abutted against or connected to the groove bottom of the coaxial groove 421a, and the second. Correspondingly, a containing groove 21 is coaxially formed in one end of the inner wall of the end cover 20 opposite to the pressure relief chamber 11, one end of the second spring 52 abuts against the bottom of the containing groove 21 and is at least partially arranged in the containing groove 21, so that the second spring 52 and the rod 32 can always keep coaxial, and the balance of the movement of the sealing assembly 40 along the rod 32 is ensured. The end cap 20 is provided with a pressure relief hole 22 communicating with the pressure relief chamber 11, so that when the second spring 52 is compressed by the sealing assembly 40, the volume of the pressure relief chamber 11 is reduced, and air in the pressure relief chamber 11 is exhausted from the pressure relief hole 22.

As shown in fig. 5, in order to improve the sealing performance of the sealing ring 41 with the rod 32 and the tubular housing 10, in the present embodiment, an inner sealing portion 412 and an outer sealing portion 413 in a ring shape are coaxially formed on an inner wall and an outer wall of the sealing ring 41, respectively, the inner sealing portion 412 and the outer sealing portion 413 are in interference fit with the rod 32 and the tubular housing 10, respectively, and the sliding sealing connection is achieved through the interference fit between the inner sealing portion 412 and the outer sealing portion 413 with the rod 32 and the tubular housing 10. In order to avoid excessive extrusion force caused by interference fit, and further increase the friction force between the seal ring 41 and the rod 32 and the tubular housing, in this embodiment, the cross sections of the inner seal portion 412 and the outer seal portion 413 are both in a wedge shape with the width gradually increasing from top to bottom or in a shuttle shape with the width gradually decreasing from the middle to two ends, which can reduce the contact area between the inner seal portion 412 and the outer seal portion 413 and the rod 32 and the tubular housing 10, respectively, and further enable the inner seal portion 412 and the outer seal portion 413 to have a certain deformation space, and the extrusion force of deformation can be minimized on the basis of ensuring sealing. When the cross sections of the inner sealing portion 412 and the outer sealing portion 413 are in a shuttle shape, the maximum width position is close to the lower end thereof, which facilitates the upward movement of the sealing ring 41, and ensures that the inner sealing portion 412 and the outer sealing portion 413 can be more tightly abutted against the outer peripheral surface of the rod 32 and the inner wall of the tubular housing 10 under the action of the medium in the pressure chamber 12 when the inner sealing portion 412 and the outer sealing portion 413 move downward. Preferably, in the present embodiment, the cross sections of the inner sealing portion 412 and the outer sealing portion 413 are both triangular, and the base angle of the inner sealing portion 412 and the base angle of the outer sealing portion 413 on the side of the retainer ring 42 are 10 to 20 °, and the base angle of the inner sealing portion 413 on the side of the piston 31 is 60 to 90 °, which can ensure that the medium in the pressure chamber 12 extrudes one surface of the triangle and make the inner sealing portion 412 and the outer sealing portion 413 more tightly abut against the outer peripheral surface of the rod 32 and the inner wall of the tubular housing 10.

As shown in fig. 2 and 4, the damper further includes a limiting member 60 disposed in the pressure chamber 12, which includes a limiting ring 61 movably sleeved on the rod 32 and a plurality of limiting claws 62 uniformly arranged along the circumference of the outer edge of the limiting ring 61, wherein one end of each limiting claw is connected to the limiting ring 61, and the other end of each limiting claw is embedded in the limiting groove 14 on the inner wall of the tubular housing 10, so as to limit the sealing assembly 40 and the piston assembly 30. In order to facilitate the medium in the pressure chamber 12 to pass through the limiting member 60 and generate an acting force on the sealing assembly 40, in this embodiment, the limiting claws 62 are bent toward the opening end of the tubular housing 10, and the inner diameter of the limiting ring 61 is larger than the outer diameter of the rod 32 and/or the outer diameter of the limiting ring 61 is smaller than the inner diameter of the tubular housing 10, that is, the medium can enter and exit through the gap between the inner wall of the limiting ring 61 and the rod 32 and/or the gap between two adjacent limiting claws 62. The stop member 60 limits the distance that the seal assembly 40 moves downward and also limits the distance that the piston 31 moves upward.

In order to increase the damping capacity of the damper, at least one fluid path is generally arranged on the piston 31, the fluid path is in a normally open state and facilitates the medium to normally enter and exit from the storage chamber 13 to the pressure chamber 12, specifically, when the two ends or one end of the damper is under the impact pressure, the piston assembly 30 moves from the open end to the closed end of the tubular housing 10, because the inner diameter of the normally open fluid path is limited, the flow rate of the medium entering the pressure chamber 12 from the storage chamber 13 is slow, the medium in the storage chamber 13 can give a large slow-punching pressure to the piston assembly 30, and further, the damping is provided for the pressure at the two ends of the damper, after the pressure disappears, the piston assembly 30 and/or the tubular housing 10 are reset under the action of the first spring 51 and the second spring 52, because the limit of the normally open fluid path, the resetting speed is too slow, when the frequency of the impact pressure is large, the damper has a limited effect.

Therefore, in order to overcome the above-mentioned drawbacks, the present embodiment preferably provides at least two fluid paths, that is, a closable fluid path is provided in addition to a fluid path in a normally open state, the closable fluid path is sealed when the piston 31 is moved from the open end of the tubular housing 10 to the closed end thereof, opened when the piston 31 is moved from the closed end of the tubular housing 10 to the open end thereof, which causes the flow rate of the medium from the reservoir chamber 13 into the pressure chamber 12 to be slowed down as the other fluid path is sealed when pressure is generated across the damper, the medium in the storage chamber 13 can give a larger buffer pressure to the piston assembly 30, so as to provide damping for the pressure at the two ends of the damper, and when the pressure at the two ends of the damper disappears, since the other fluid path is open, the piston assembly 30 and/or the tubular housing 10 can be quickly reset under the action of the first spring 51 and the second spring 52.

As shown in fig. 2, 4, and 8 to 11, the piston 31 of the piston assembly 30 of the present embodiment includes a fixed portion 311 and a movable portion 312, the fixed portion 311 is fixedly sleeved on the rod 32, at least two first fluid channels communicating with the pressure chamber 12 and the storage chamber 13 are disposed on the fixed portion 311, the movable portion 312 is slidably sleeved on the rod 32, a second fluid channel connected to one of the first fluid channels is disposed on the movable portion 312, the first fluid channel and the second fluid channel are communicated to form a first fluid path in a normally open state, and when the pressure of the storage chamber 13 is greater than the pressure chamber 12, the movable portion 312 can slide along the rod 32 and block another first fluid channel, where another first fluid channel forms a second fluid path that can be closed. In the present embodiment, a sliding connection is adopted, when the piston 31 moves from the open end to the closed end of the tubular housing 10, the liquid medium in the storage chamber 13 gives the movable part 312a force toward the open end of the tubular housing 10, so that the movable part 312 slides along the rod 32 toward the fixed part 311 until one of the first fluid passages on the fixed part 311 is blocked, and further the second fluid path is blocked, and when the piston 31 moves from the closed end to the open end of the tubular housing 10 under the forces of the first spring 51 and the second spring 52, the liquid medium in the pressure chamber 12 moves toward the storage chamber 13, which generates a force to the movable part 312, so that the movable part 312 moves along the rod 32 away from the fixed part 311, which can open the blocked first fluid passage, i.e. both the first fluid path and the second fluid path are in an open state, which can increase the flow rate, allowing the piston assembly 30 to quickly reset. To ensure rapid return of the piston assembly 30, the cross-sectional area of the first fluid path is generally much smaller than the cross-sectional area of the second fluid path.

As shown in fig. 8 and 9, the fixing portion 311 of the present embodiment includes a fixing portion body 311a having a gap between an outer wall thereof and the tubular housing 10, and a flexible body 311b having an outer diameter gradually increasing from an outer edge of the fixing portion body 311a to a side of the movable portion 312, a free end of the flexible body 311b is flexibly attached to an inner wall of the tubular housing 10, and a third fluid path is formed between the flexible body 311b and the inner wall of the tubular housing 10. Specifically, the flexible body 311b is made of a flexible material, such as rubber or silicone, and has a certain elastic deformation, when the piston 31 moves from the open end to the closed end of the tubular housing 10, the liquid medium in the storage chamber 13 provides hydraulic force to the flexible body 311b, so that the flexible body 311b expands and the outer peripheral surface of the flexible body is tightly attached to the inner wall of the tubular housing 10, thereby sealing the third fluid path, and when the piston 31 moves from the closed end to the open end of the tubular housing 10, the liquid medium in the pressure chamber 12 enters from the gap between the outer wall and the tubular housing 10, and generates pressure on the outer wall of the flexible body 311b, which can enable the third fluid path to be conducted.

As shown in fig. 8 to 11, the inner wall of the fixing portion body 311a is opened with at least one first communicating groove a11 arranged along the axial direction thereof, the movable portion 312 includes a movable portion body 312a, a communicating gap communicated with the first communicating groove a11 is formed between the inner wall of the movable portion body 312a and the rod 32, and the communicating gap is communicated with the first communicating groove a11 and constitutes a first fluid path.

The fixing portion body 311a is provided with at least one first through hole a12 which is vertically through; the movable portion 312 further includes at least one blocking protrusion 312b disposed on one side of the movable portion body 312a opposite to the fixed portion body 311a and corresponding to the first through hole a 12. The first communication hole a12 may constitute a second fluid path, and the blocking protrusion 312b may be used to block the first communication hole a12 and thus the second fluid path when the piston 31 moves from the open end of the tubular housing 10 to the closed end thereof. The number of the first communication holes a12 and the number of the blocking protrusions 312b in this embodiment are four, and it is understood that other numbers of the first communication holes a12 and the blocking protrusions 312b may be provided according to the requirement in this embodiment.

In order to improve the sealing performance of the second fluid path, the blocking protrusion 312b is a cone with a gradually decreasing cross section from one end of the movable portion body 312a to the free end thereof, the first through hole a12 is a cone matched with the blocking protrusion 312b relative to one end of the blocking protrusion 312b, and by setting the blocking protrusion 312b and the first through hole a12 to be matched with each other, when the blocking protrusion 312b blocks, the hydraulic pressure of the medium in the reservoir chamber 13 is increased, and the blocking protrusion 312b is matched with the first through hole a12 more tightly. The blocking protrusion 312b may be a truncated cone.

As shown in fig. 13 to 15, as a better implementation manner, the movable portion 312 of the present embodiment includes a movable portion body 312a, a limiting protruding strip 312d and a blocking ball 312e, the movable portion body 312a is sleeved on the free end of the rod 32, the limiting protruding strip 312d and the blocking ball 312e are disposed in one-to-one correspondence with the first through hole a12, one end of each limiting protruding strip 312d is connected to the movable portion body 312a, the other end of each limiting protruding strip faces one of the first through holes a12, a maximum distance between the limiting protruding strip 312d and the corresponding first through hole a12 is smaller than an outer diameter of the blocking ball 312e, and each blocking ball 312e is at least partially disposed in the first through hole a12 and can move towards the first through hole a12 and block the first through hole a 12. In this embodiment, the movable portion body 312a can be slidably connected to the rod 32 or fixedly connected to the rod 32, and the specific structure of the movable portion body 312a is substantially the same as that of the above-mentioned embodiment, and therefore, the detailed description thereof is omitted. When the movable body 312a is slidably connected to the rod 32, the movable body 312a, the limiting protrusion 312d and the blocking ball 312e can move towards the first through hole a12 synchronously, so that the blocking ball 312e blocks the first through hole a12, and when the movable body 312a is fixedly connected to the rod 32, only the blocking ball 312e moves towards the first through hole a12 and blocks the first through hole a 12. In this embodiment, the first communication hole a12 includes a first step hole a121, a second step hole a122 and a third step hole a123 which are sequentially communicated, the second step hole a122 is a wedge-shaped hole whose inner diameter gradually decreases from the end of the third step hole a123 to the end of the first step hole a121, the blocking ball 312e is at least partially disposed in the third step hole a123 and its outer circumferential surface can be abutted against the inner wall of the second step hole a122 in a matching manner, when the piston 31 moves from the open end to the closed end of the tubular housing 10, the blocking ball 312e can move toward the second step hole a122 along the third step hole a123 and cooperate with the second step hole a122 to block the second step hole a 122. In order to improve the blocking effect and promote the movement of the blocking ball 312e to the second-step hole a122, the inner diameter of the third-step hole a123 is generally slightly larger than the outer diameter of the blocking ball 312e, and specifically, the outer diameter of the third-step hole a123 may be set to be 1.1 to 1.2 times of the diameter of the blocking ball 312 e. In order to facilitate the limitation of the blocking ball 312e, the end surface of the free end of the limiting protruding strip 312d is a plane, a spherical surface or a conical surface, wherein the spherical surface is preferred, which can increase the fixation and limitation of the blocking ball 312 e.

When the movable portion body 312a is slidably connected to the rod 32, in order to ensure only axial sliding between the movable portion 312 and the fixed portion 311, that is, to ensure that the first through holes a12 and the blocking protrusions 312b are blocked in a one-to-one correspondence, in this embodiment, the fixed portion 311 further includes at least two guide rails 311c formed by extending the inner wall of the fixed portion body 311a along the axial direction of the flexible body 311b, the at least two guide rails are uniformly arranged along the circumferential direction of the rod 32, and each guide rail 311c is L-shaped, and one end of each guide rail abuts against the outer circumferential surface of the rod 32; at least two guide grooves a21 which are in one-to-one corresponding sliding connection with the guide rails 311c are formed in the inner wall of the movable part body 312a, when the movable part 312 moves relative to the fixed part 311, the movable part body 312a only moves along the guide rails 311c, the movable part 312 can be prevented from rotating relative to the fixed part 311, and the plugging precision of the plugging protrusion 312b is further ensured.

In order to improve the stability of the sealing, the movable portion 312 of this embodiment further includes a plurality of supporting members 312c uniformly arranged along the circumferential direction of the rod 32, each supporting member 312c is L-shaped, one end of each supporting member is connected to one side of the movable portion body 312a away from the sealing protrusion 312b, and the other end of each supporting member is in sliding contact with the outer circumferential surface of the rod 32, and two-point axial support is performed through the supporting members 312c and the movable portion body 312a, which is beneficial to ensuring the coaxiality of the movable portion 312 and the rod 32, and is convenient for the sealing protrusion 312b to smoothly seal the first through hole a 12. The end surface of the support 312c abutting the rod 32 fits the outer peripheral surface of the rod 32, i.e. the end surface of the support 312c abutting the rod 32 is arc-shaped.

As shown in fig. 2 and 4, in order to limit the fixed portion 311 and the movable portion 312, the rod 32 has two sliding grooves 321 coaxially formed at one end of the movable portion 312, the two sliding grooves 321 are vertically disposed, one end of the guide rail 311c abuts against the bottom of one of the sliding grooves 321 located at the upper side, one end of the support member 312c abuts against the bottom of the other sliding groove 321 located at the lower side, and the two sliding grooves 321 can respectively limit the fixed portion 311 and the sliding distance of the movable portion 312.

As shown in fig. 2, 4 and 12, in order to increase the protection of the movable portion 312, the piston 31 of the embodiment further includes a pad 313 attached to an end surface of the fixed portion body 311a on a side away from the flexible body 311b, because the first communicating groove a11 and the first communicating hole a12 are easily sealed by the pad 313, the end surface of the fixed portion body 311a on a side opposite to the pad 313 is provided with second communicating grooves a13 respectively in one-to-one communication with the first communicating holes a12 and the first communicating grooves a11, and the pad 313 is provided with second communicating holes 313a in one-to-one communication with the second communicating grooves a 13. At this time, the first communication groove a11, the communication gap, and the second communication groove a13, and/or the first communication groove a11, the communication gap, the second communication groove a13, and the second communication hole 313a form a first fluid path.

The damper of the embodiment has the following working process: as shown in fig. 1 and 2, when the damper is in the normal state, the first spring 51 and the second spring 52 are both in the extended state, the seal ring 41 and the piston 31 are respectively abutted against two side surfaces of the limiting member 60, and the reservoir chamber 13 is filled with a liquid medium, such as oil; as shown in fig. 3 and 4, when the two ends and/or one end of the damper are pressurized, the rod 32 drives the piston 31 to move from the open end to the closed end of the tubular housing 10, the movable part 312 slides along the rod 32 to the fixed part 311 under the action of the hydraulic pressure of the medium in the accumulator chamber 13, the blocking protrusion 312b seals and blocks the first communication hole a12 to seal the second fluid path, and the liquid medium can hydraulically act on the flexible body 311b to make the outer wall part of the flexible body 311b cling to the inner wall of the tubular housing 10 to seal the third fluid path, the medium in the accumulator chamber 13 can only enter the pressure chamber 12 from the first fluid path formed by the first communication hole a11, the communication gap, the second communication hole a13 and/or the second communication hole 313a, the flow rate of the first fluid path is limited, so that the medium in the accumulator chamber 13 can enter the pressure chamber 12, damping is provided, so that the pressure applied to the damper is buffered, and the medium entering the pressure chamber 12 from the reservoir chamber 13 can drive the sealing assembly 40 to move along the tubular housing 10 to the opening end thereof; after the pressure disappears, under the action of the first spring 51 and the second spring 52, the sealing assembly 40 and the piston 31 both move towards the position closer to the position-limiting member 60, and when the piston 31 moves towards the position-limiting member 60, the second fluid path and the third fluid path can both be automatically opened, i.e. the movable portion 312 moves away from the fixed portion 311 to open the first communication hole a12, the medium in the pressure chamber 12 generates pressure on the outer wall of the flexible body 311b, so that a gap is formed between the flexible body 311b and the inner wall of the tubular housing 10 to open the third fluid path, and since the medium in the pressure chamber 12 can rapidly enter the storage chamber 13, the sealing assembly 40 and the piston assembly 30 can both be rapidly reset, so that the sealing ring 41 and the piston 31 are respectively in contact with the two sides of the position-limiting member 60 in a matching manner, so as to cope with the next.

The above-described embodiments of the present invention should not be construed as limiting the scope of the invention. Various other changes and modifications according to the technical idea of the invention should be included in the protection scope of the claims.

Claims

1. A damper, characterized by comprising:

a tubular housing having one end closed and the other end open;

an end cap sealingly connected to the open end of the tubular housing;

2. The damper of claim 1, wherein: the sealing assembly comprises a sealing ring and a baffle ring, the inner wall and the outer wall of the sealing ring are respectively connected with the rod and the tubular shell in a sliding and sealing mode, one end of the baffle ring is embedded in the sealing ring, and the other end of the baffle ring abuts against the second spring; the end face of one end, opposite to the pressure relief chamber, of the sealing ring is coaxially provided with an annular groove, and one end of the baffle ring is embedded in the annular groove in a matching mode.

3. The damper of claim 2, wherein: the inner wall and the outer wall of the sealing ring are respectively and coaxially provided with an annular inner sealing part and an annular outer sealing part, and the inner sealing part and the outer sealing part are respectively in interference fit with the rod and the tubular shell; the cross sections of the inner sealing part and the outer sealing part are both in a wedge shape with the width gradually increasing from top to bottom or in a shuttle shape with the width gradually decreasing from the middle part to two ends, and when the cross sections of the inner sealing part and the outer sealing part are in the shuttle shape, the maximum width position is close to the lower end of the inner sealing part and the outer sealing part; and the base angle of the piston on one side of the piston is 10-20 degrees, and the base angle of the piston on one side of the piston is 60-90 degrees.

4. The damper of claim 3, wherein: one end of the inner wall of the end cover, which is opposite to one end of the pressure relief chamber, is coaxially provided with an accommodating groove, one end of the second spring is abutted against the bottom of the accommodating groove and at least partially arranged in the accommodating groove; and the end cover is provided with a pressure relief hole communicated with the pressure relief chamber.

5. The damper of claim 4, wherein: the damper also comprises a limiting part arranged in the pressure chamber, the limiting part comprises a limiting ring movably sleeved on the rod and a plurality of limiting claws uniformly arranged along the circumferential direction of the outer edge of the limiting ring, one end of each limiting claw is connected with the limiting ring, and the other end of each limiting claw is embedded in a limiting groove on the inner wall of the tubular shell; the limiting claw is bent towards the opening end of the tubular shell; the inner diameter of the stop collar is greater than the outer diameter of the rod and/or the outer diameter of the stop collar is less than the inner diameter of the tubular housing.

6. The damper of claim 1, wherein: the fixing part comprises a fixing part body and a flexible body, wherein a gap is formed between the outer wall of the fixing part body and the tubular shell, the flexible body is formed by extending the outer edge of the fixing part body to one side of the movable part, the outer diameter of the flexible body is gradually increased, and the free end of the flexible body is flexibly attached to the inner wall of the tubular shell.

7. The damper of claim 6, wherein: the inner wall of the fixed part body is provided with at least one first connecting groove arranged along the axial direction of the fixed part body, the movable part comprises a movable part body, and a communicating gap communicated with the first connecting groove is formed between the inner wall of the movable part body and the rod; the fixing part body is provided with at least one first through hole which is communicated up and down; the movable part also comprises at least one plugging bulge which is arranged on one side of the movable part body relative to the fixed part body and corresponds to the first through holes one to one.

8. The damper of claim 7, wherein: the fixing part also comprises at least two guide rails formed by extending one side of the inner wall of the fixing part body relative to the flexible body along the axial direction of the flexible body, the at least two guide rails are uniformly arranged along the circumferential direction of the rod, each guide rail is L-shaped, and one end of each guide rail is abutted against the outer circumferential surface of the rod; the inner wall of the movable part body is provided with at least two guide grooves which are in one-to-one corresponding sliding connection with the guide rails; the cross section of the plugging bulge is a taper gradually reduced from one end of the movable part body to the free end of the movable part body, and the end, opposite to the plugging bulge, of the first through hole is a taper matched with the plugging bulge.

9. The damper of claim 8, wherein: the movable part also comprises a plurality of supporting pieces which are uniformly arranged along the circumferential direction of the rod, each supporting piece is L-shaped, one end of each supporting piece is connected to one side of the movable part body, which is far away from the plugging bulge, and the other end of each supporting piece is in sliding butt joint with the outer circumferential surface of the rod; two sliding grooves are coaxially formed in one end, opposite to the movable portion, of the rod, one end of the guide rail abuts against the bottom of one of the sliding grooves, and one end of the supporting piece abuts against the bottom of the other sliding groove.

10. The damper of claim 9, wherein: the piston further comprises a cushion block attached to the end face of one side, away from the flexible body, of the fixing portion body, second communicating grooves which are communicated with the first communicating holes and the first communicating grooves in a one-to-one correspondence mode are formed in the end face of one side, opposite to the cushion block, of the fixing portion body, and second communicating holes which are communicated with the second communicating grooves in a one-to-one correspondence mode are formed in the cushion block.