CN108662063B

CN108662063B - Damper

Info

Publication number: CN108662063B
Application number: CN201810801801.6A
Authority: CN
Inventors: 何亮
Original assignee: Hubei Hongshengchang Electronic Co ltd
Current assignee: Hubei Hongshengchang Electronic Co ltd
Priority date: 2018-06-11
Filing date: 2018-07-20
Publication date: 2024-04-19
Anticipated expiration: 2038-07-20
Also published as: CN108662063A

Abstract

The invention discloses a damper, comprising: a tubular housing; an end cap; a piston assembly comprising a piston and a rod; the sealing component is annular and is arranged between the piston and the end cover, and the inner wall and the outer wall of the sealing component are respectively connected with the rod and the tubular shell in a sliding sealing manner; 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 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 inner cavity of the tubular shell into a pressure release chamber, a pressure chamber and a storage chamber from the opening end to the closing end, and at least one fluid path for communicating the storage chamber and the pressure chamber is arranged on the piston assembly. According to the invention, the sealing component and the second spring are arranged, so that the compression and the restoration of the pressure release chamber can be realized, and the sealing component and the second spring can be made of conventional materials and have long service life.

Description

Damper

Technical Field

The present invention relates to a damper.

Background

The chinese patent publication No. CN103201533B discloses a linear damper having a compensation film with an integral seal, which enables the space V to be reset through the elastic deformation of the compensation film, and since the middle part of the compensation film is mainly radially elastically deformed when the volume of the space V changes, the requirement on the material of the compensation film is extremely high, and the middle part of the compensation film is easily damaged during the elastic deformation, which easily leads to the reduction of the service life of the damper.

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 resetting of a compensation film adopted by a damper in the prior art.

In order to achieve the above technical object, 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, wherein the piston is arranged in the inner cavity of the tubular shell and can do reciprocating sliding motion along the inner wall of the tubular shell; one end of the rod passes through the end cover and is connected with the piston;

a sealing assembly which is annular and is arranged between the piston and the end cover, and the inner wall and the outer wall of the sealing assembly are respectively connected with the rod and the tubular shell in a sliding sealing manner;

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 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 inner cavity of the tubular shell into a pressure release chamber, a pressure chamber and a storage chamber from the opening end to the closing end, and at least one fluid path for communicating the storage chamber and the pressure chamber is arranged on the piston assembly.

Compared with the prior art, the invention has the beneficial effects that: by arranging the sealing component and the second spring which are respectively connected with the rod and the tubular shell in a sliding sealing way, the compression and the resetting of the pressure release chamber can be realized, and the sealing component and the second spring can be made of conventional materials and have long service life.

Drawings

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

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

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

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

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

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

FIG. 7 is a schematic perspective view of a spacing member of the present invention;

FIG. 8 is a perspective view of a fixing portion according to the present invention;

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

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

FIG. 11 is a schematic perspective view of another view of the movable portion of the present invention;

FIG. 12 is a schematic perspective view of a pad of the present invention;

FIG. 13 is a schematic view of a first use condition of the damper of the present invention in another embodiment;

FIG. 14 is a schematic view showing a second use state of the damper according to the present invention in another embodiment

Fig. 15 is an enlarged view of a portion of fig. 13 in accordance with the present invention.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Referring to fig. 1-4, the present invention provides a damper comprising a tubular housing 10, an end cap 20, a piston assembly 30, a seal assembly 40, and a reset assembly 50.

The tubular housing 10 is closed at one end and open at the other end, and an 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 shell 10 and can do reciprocating sliding motion along the inner wall of the tubular shell 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 disposed between the piston 31 and the end cap 20, and has inner and outer walls slidably and sealingly connected to the rod 32 and the tubular housing 10, respectively.

The reset assembly 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 inside the tubular housing 10, and has one end abutting against the end cap 20 and the other end abutting against the seal assembly 40.

The inner cavity of the tubular casing 10 is sequentially divided into a pressure release chamber 11, a pressure chamber 12 and a storage chamber 13 from an open end to a closed end by the sealing assembly 40 and the piston 31, and at least one fluid path for communicating the storage chamber 13 and the pressure chamber 12 is arranged on the piston assembly 30.

When the damper of this embodiment works, as shown in fig. 3 and 4, the pressure borne by the damper drives the piston assembly 30 to move from the open end of the tubular housing 10 to the closed end thereof, and the medium stored in the storage 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 to move reversely to the rod 32 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 reversely to the piston assembly 30 again, so that the medium in the pressure chamber 12 flows back into the storage chamber 13 from the fluid path.

As shown in fig. 2, 4, 5 and 6, the seal assembly 40 includes a seal ring 41 and a stop ring 42, the inner wall and the outer wall of the seal ring 41 are respectively in sealing sliding connection with the rod 32 and the tubular housing 10, one end of the stop ring 42 is embedded in the seal ring 41, the other end is abutted against the second spring 52, the seal ring 41 may be made of a material capable of sliding sealing connection with the outer circumferential surface of the rod 32 and the inner wall of the tubular housing 10, such as metal, rubber or the like, when a rubber-like material with a certain elasticity is adopted, an interference fit manner is adopted to increase the sealing effect, and the seal ring 41 in this embodiment preferably adopts a rubber-like material with a certain elasticity, and the stop ring 42 may be made of a common metal material. In a specific arrangement, in this embodiment, an annular groove 411 is coaxially formed in the sealing ring 41 opposite to the end face of one end of the pressure release chamber 11, one end of the retaining ring 42 is fitted in the annular groove 411, the cross section of the sealing ring 41 is approximately U-shaped through the arrangement of the annular groove 411, the retaining ring 42 may be provided with a T-shaped cross section, which may be composed of a retaining ring body 421 and an inner inlay 422, the inner inlay 422 is fitted in the annular groove 411, the upper end of the inner inlay is connected with the retaining ring body 421, a coaxial groove 421a is coaxially formed in the retaining ring body 421 opposite to the end face of one end of the second spring 52, and the lower end of the second spring 52 is abutted against or connected to the groove bottom of the coaxial groove 421a, so that the second spring 52 is always coaxial with the retaining ring 42 when elastically deformed. Correspondingly, an accommodating groove 21 is coaxially formed in the inner wall of the end cover 20 opposite to one end of the pressure release chamber 11, and one end of the second spring 52 abuts against the bottom of the accommodating groove 21 and is at least partially disposed in the accommodating groove 21, so that the second spring 52 and the rod 32 can always maintain coaxiality, 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 that is communicated 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 the air in the pressure relief chamber 11 is discharged from the pressure relief hole 22.

As shown in fig. 5, in order to improve the tightness between the seal ring 41 and the rod 32 and the tubular housing 10, in this embodiment, an inner wall and an outer wall of the seal ring 41 are coaxially formed with an annular inner seal portion 412 and an annular outer seal portion 413, respectively, and the inner seal portion 412 and the outer seal portion 413 are in interference fit with the rod 32 and the tubular housing 10, respectively, and are in sliding sealing connection with the rod 32 and the tubular housing 10 through interference fit between the inner seal portion 412 and the outer seal portion 413. In order to avoid excessive extrusion force caused by interference fit, and further increase friction force between the sealing ring 41 and the rod 32 and the tubular shell, in this embodiment, the cross sections of the inner sealing portion 412 and the outer sealing portion 413 are wedge-shaped with gradually increased widths from top to bottom or shuttle-shaped with gradually reduced widths from middle to two ends, which can reduce contact areas between the inner sealing portion 412 and the outer sealing portion 413 and the rod 32 and the tubular shell 10 respectively, and further enable the inner sealing portion 412 and the outer sealing portion 413 to have a certain deformation space, so that the extrusion force of deformation can be minimized on the basis of ensuring sealing. When the cross sections of the inner sealing part 412 and the outer sealing part 413 are in a fusiform shape, the largest width is close to the lower end of the inner sealing part, which can facilitate the upward movement of the sealing ring 41, and ensure that the inner sealing part 412 and the outer sealing part 413 can be more tightly abutted against the outer peripheral surface of the rod 32 and the inner wall of the tubular shell 10 under the action of the medium in the pressure chamber 12 when the sealing ring 41 moves downwards. More preferably, in this embodiment, the cross sections of the inner sealing portion 412 and the outer sealing portion 413 are triangular, and the base angle of the inner sealing portion 412 and the outer sealing portion 413 on the side of the baffle ring 42 is 10-20 °, and the base angle of the inner sealing portion on the side of the piston 31 is 60-90 °, which can ensure that the medium in the pressure chamber 12 presses against one of the faces 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, and includes a limiting ring 61 movably sleeved on the rod 32 and a plurality of limiting claws 62 uniformly circumferentially disposed along the outer edge of the limiting ring 61, where one end of each limiting claw is connected to the limiting ring 61, and the other end of each limiting claw is embedded in a 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 exert force on the sealing assembly 40, in this embodiment, the limiting claws 62 are bent toward the opening end direction 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, i.e. 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 stopper 60 can limit the downward movement distance of the sealing assembly 40 and also limit the upward movement distance of the piston 31.

In order to increase the damping capacity of the damper, at least one fluid path is generally disposed on the piston 31, and the fluid path is in a normally open state, which is convenient for medium to enter and exit the pressure chamber 12 from the storage chamber 13, specifically, when two ends or one end of the damper bear 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 medium from the storage chamber 13 enters the pressure chamber 12 at a slower flow rate, and the medium in the storage chamber 13 can give the piston assembly 30 a larger buffer pressure, thereby providing damping for the pressure at two ends of the damper, when 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, and because of the limitation of the normally open fluid path, the reset speed is too slow, and when the frequency of the impact pressure is larger, the effect of the damper is limited.

In order to overcome the above-mentioned drawbacks, it is preferable to provide at least two fluid paths, i.e. in addition to one fluid path in a normally open state, a closable fluid path which seals when the piston 31 moves from the open end of the tubular housing 10 to the closed end thereof and opens when the piston 31 moves from the closed end of the tubular housing 10 to the open end thereof, which allows the damper to be pressurized at both ends, wherein the flow rate of the medium from the reservoir 13 into the pressure chamber 12 is slowed due to the sealing of the other fluid path, and the medium in the reservoir 13 gives the piston assembly 30 a larger buffer pressure, thereby providing damping for the pressure at both ends of the damper, and wherein after the pressure at both ends of the damper has disappeared, the piston assembly 30 and/or the tubular housing 10 can be quickly reset due to the opening of the other fluid path acting at the first spring 51 and the second spring 52.

As shown in fig. 2,4 and 8-11, the piston 31 of the piston assembly 30 of this 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 with 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 therein, and when the pressure of the storage chamber 13 is greater than that of the pressure chamber 12, the movable portion 312 can slide along the rod 32 and block the other first fluid channel, where the other first fluid channel forms a closable second fluid path. In this embodiment, when the piston 31 moves from the open end of the tubular housing 10 to the closed end thereof, the liquid medium in the storage chamber 13 gives the movable portion 312 an acting force to the open end of the tubular housing 10, so that the movable portion 312 slides along the rod 32 to the fixed portion 311 until one of the first fluid passages on the fixed portion 311 is blocked, and then the second fluid passage is blocked, while when the piston 31 moves from the closed end of the tubular housing 10 to the open end thereof under the acting force of the first spring 51 and the second spring 52, the liquid medium in the pressure chamber 12 moves to the storage chamber 13, which exerts an acting force on the movable portion 312, so that the movable portion 312 moves away from the fixed portion 311 along the rod 32, which can open the blocked first fluid passage, i.e., both the first fluid passage and the second fluid passage are in an open state, which can increase the flow rate, so that the piston assembly 30 is quickly reset. To ensure rapid return of the piston assembly 30, the cross-sectional area of the first fluid path is typically 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 with a gap formed between an outer wall and the tubular housing 10, and a flexible body 311b with an outer diameter gradually increasing and formed by extending from the outer edge of the fixing portion body 311a to the movable portion 312 side, wherein 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 silica gel, and has a certain elastic deformation, when the piston 31 moves from the open end of the tubular housing 10 to the closed end thereof, the liquid medium in the storage chamber 13 gives the flexible body 311b hydraulic force, so that the flexible body 311b expands and the outer peripheral surface 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 of the tubular housing 10 to the open end thereof, 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, so that the third fluid path is conducted.

As shown in fig. 8 to 11, the inner wall of the fixed portion body 311a is provided with at least one first communication groove a11 disposed along the axial direction thereof, the movable portion 312 includes a movable portion body 312a, and a communication gap communicating with the first communication groove a11 is formed between the inner wall of the movable portion body 312a and the rod 32, and the communication gap communicates with the first communication groove a11 and forms a first fluid path.

The fixing part body 311a is provided with at least one first communication hole a12 which penetrates up and down; the movable portion 312 further includes at least one blocking protrusion 312b disposed on a side of the movable portion body 312a opposite to the fixed portion body 311a and in one-to-one correspondence with the first communication hole a 12. The first communication hole a12 may constitute a second fluid path, and the blocking protrusion 312b may serve 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 toward the closed end thereof. In this embodiment, the number of the first through holes a12 and the plugging protrusions 312b is four, and it is understood that other numbers of the first through holes a12 and the plugging protrusions 312b may be provided as required.

In order to improve the sealing performance of the second fluid path, the sealing protrusion 312b is tapered from one end of the movable portion body 312a to the free end thereof, the first communication hole a12 is tapered to be engaged with the sealing protrusion 312b with respect to one end of the sealing protrusion 312b, and when the sealing protrusion 312b seals by setting the sealing protrusion 312b and the first communication hole a12 to be engaged with each other, the sealing protrusion 312b is engaged with the first communication hole a12 more tightly as the pressure of the medium in the storage chamber 13 is higher. The plugging protrusion 312b may specifically be a truncated cone.

As shown in fig. 13 to 15, as a better embodiment, the movable portion 312 of this embodiment includes a movable portion body 312a, a limit protrusion 312d and a blocking ball 312e, where the movable portion body 312a is sleeved on the free end of the rod 32, the limit protrusion 312d and the blocking ball 312e are disposed in one-to-one correspondence with the first communication holes a12, one end of each limit protrusion 312d is connected to the movable portion body 312a, the other end is opposite to one of the first communication holes a12, and a maximum distance between the limit protrusion 312d and the corresponding first communication 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 communication hole a12 and can move toward the first communication hole a12 and block the first communication hole a12. In the present 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 embodiment, so that the description thereof will be omitted. When the movable portion body 312a is slidably connected to the rod 32, the movable portion body 312a, the limiting protruding strip 312d and the blocking ball 312e can move synchronously toward the first communication hole a12, so that the blocking ball 312e blocks the first communication hole a12, and when the movable portion body 312a is fixedly connected to the rod 32, only the blocking ball 312e moves toward the first communication hole a12 and blocks the first communication hole a12. 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 with an inner diameter gradually reduced 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 has an outer peripheral surface capable of being matched and abutted against the inner wall of the second step hole a122, and when the piston 31 moves from the open end of the tubular housing 10 to the closed end thereof, the blocking ball 312e can move along the third step hole a123 to the second step hole a122 and is matched with the second step hole a122 to block the second step hole a 122. In order to facilitate the improvement of the plugging effect and the promotion of the movement of the plugging 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 plugging ball 312e, specifically, the outer diameter of the third step hole a123 may be set to be 1.1-1.2 times the diameter of the plugging ball 312 e. In order to facilitate the limitation of the blocking ball 312e, the free end surface of the limiting protrusion 312d in this embodiment is a plane, a sphere or a conical surface, wherein a sphere is preferred, which can increase the fixation and limitation of the blocking ball 312 e.

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

In order to improve the blocking stability, in this embodiment, the movable portion 312 further includes a plurality of supporting members 312c uniformly disposed along the circumferential direction of the rod 32, each supporting member 312c is L-shaped, one end of each supporting member 312c is connected to one side of the movable portion body 312a away from the blocking protrusion 312b, the other end of each supporting member is slidably abutted to the outer circumferential surface of the rod 32, and two-point axial support is performed by the supporting member 312c and the movable portion body 312a, which is beneficial to ensuring the coaxiality of the movable portion 312 and the rod 32, so that the blocking protrusion 312b can smoothly block the first communication hole a 12. The end surface of the support 312c abutting against the rod 32 is engaged with the outer circumferential surface of the rod 32, that is, the end surface of the support 312c abutting against the rod 32 is arc-shaped.

As shown in fig. 2 and fig. 4, in order to facilitate limiting the fixed portion 311 and the movable portion 312, two sliding grooves 321 are coaxially provided at one end of the rod 32 opposite to the movable portion 312, the two sliding grooves 321 are vertically disposed, one end of the guide rail 311c is abutted to the bottom of one of the sliding grooves 321 located at the upper side, one end of the support piece 312c is abutted to the bottom of the other sliding groove 321 located at the lower side, and the two sliding grooves 321 can respectively fix and limit the fixed portion 311 and limit 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 this embodiment further includes a pad 313 attached to an end surface of the fixed portion body 311a away from the flexible body 311b, and since the pad 313 is easy to block the first communication slot a11 and the first communication slot a12, the end surface of the fixed portion body 311a opposite to the pad 313 is provided with second communication slots a13 respectively in one-to-one communication with the first communication slots a12 and a11, and the pad 313 is provided with second communication holes 313a in one-to-one communication with the second communication slots 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 working flow of the damper of the embodiment is as follows: as shown in fig. 1 and 2, when the damper is in a normal state, the first spring 51 and the second spring 52 are in an extended state, the sealing ring 41 and the piston 31 are respectively abutted against two side surfaces of the limiting member 60, and the storage 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, under the hydraulic pressure of the medium in the storage chamber 13, the movable part 312 slides along the rod 32 to the fixed part 311, the blocking protrusion 312b seals the first communication hole a12 to seal the second fluid path, meanwhile, the liquid medium can hydraulically act on the flexible body 311b to enable the outer wall part of the flexible body 311b to be tightly attached to the inner wall of the tubular housing 10 to seal the third fluid path, and the medium in the storage chamber 13 can only enter the pressure chamber 12 from the first fluid path consisting of the first communication groove a11, the communication gap and the second communication groove a13 and/or the second communication hole 313a, and the flow rate of the first fluid path is limited, so that the medium in the storage chamber 13 can give damping in the process of entering the pressure chamber 12, thereby buffering the pressure received by the damper, and the medium in the storage chamber 13 can drive the sealing assembly 40 entering the pressure chamber 12 to move along the open end of the tubular housing 10; when the pressure is eliminated, under the action of the first spring 51 and the second spring 52, the sealing assembly 40 and the piston 31 move towards the limiting member 60, and when the piston 31 moves towards the limiting member 60, the second fluid path and the third fluid path can be automatically opened, that is, the movable portion 312 is far away from the fixed portion 311 to open the first communication hole a12, the medium in the pressure chamber 12 presses the outer wall of the flexible body 311b to form a gap between the flexible body 311b and the inner wall of the tubular housing 10 so as to open the third fluid path, and as the medium in the pressure chamber 12 can quickly enter the storage chamber 13, the sealing assembly 40 and the piston assembly 30 can quickly reset, so that the sealing ring 41 and the piston 31 respectively cooperate and abut against two sides of the limiting member 60, so that the next pressure impact can be conveniently coped with.

The above-described embodiments of the present invention do not limit the scope of the present invention. Any other corresponding changes and modifications made in accordance with the technical idea of the present invention shall be included in the scope of the claims of the present invention.

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;

the sealing assembly and the piston divide the inner cavity of the tubular shell into a pressure release chamber, a pressure chamber and a storage chamber from the open end to the closed end in sequence, and at least one fluid path for communicating the storage chamber and the pressure chamber is arranged on the piston assembly;

The piston of the piston assembly comprises a fixed part and a movable part, the fixed part is fixedly sleeved on the rod, at least two first fluid channels which are communicated with the pressure chamber and the storage chamber are arranged on the fixed part, the movable part is slidably sleeved on the rod, a second fluid channel which is connected with one of the first fluid channels is arranged on the movable part, the first fluid channel and the second fluid channel are communicated to form a first fluid channel which is in a normally open state, and when the pressure of the storage chamber is larger than that of the pressure chamber, the movable part can slide along the rod and block the other first fluid channel, and the other first fluid channel forms a second fluid channel which is capable of being blocked.

2. A damper according to 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 sealing manner, and one end of the baffle ring is embedded into the sealing ring, and the other end of the baffle ring is abutted to the second spring.

3. A damper according to claim 2, wherein: an annular groove is coaxially formed in the end face of one end, opposite to the pressure release chamber, of the sealing ring, and one end of the baffle ring is fit and embedded in the annular groove.

4. A damper according to claim 2 or 3, wherein: the inner wall and the outer wall of the sealing ring are respectively 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.

5. The damper according to claim 4, wherein: the cross sections of the inner sealing part and the outer sealing part are wedge-shaped with gradually increased widths from top to bottom or fusiform with gradually reduced widths from the middle part to two ends, and when the cross sections of the inner sealing part and the outer sealing part are fusiform, the largest width is close to the lower end of the inner sealing part and the outer sealing part.

6. The damper according to claim 5, wherein: the cross sections of the inner sealing part and the outer sealing part are triangular, the base angle of the inner sealing part and the outer sealing part on one side of the baffle ring is 10-20 degrees, and the base angle of the inner sealing part and the outer sealing part on one side of the piston is 60-90 degrees.

7. A damper according to claim 1, wherein: an accommodating groove is coaxially formed in one end, opposite to the pressure release chamber, of the inner wall of the end cover, one end of the second spring is abutted to the bottom of the accommodating groove, and at least part of the second spring is arranged in the accommodating groove; wherein, set up on the end cover with the release hole of pressure release room intercommunication.

8. A damper according to claim 1, wherein: the damper further comprises a limiting piece arranged in the pressure chamber and comprises a limiting ring movably sleeved on the rod and a plurality of limiting claws uniformly distributed along the circumferential direction of the outer edge of the limiting ring, and 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.

9. The damper according to claim 8, wherein: the limiting claw is bent towards the opening end direction of the tubular shell.

10. The damper according to claim 9, wherein: the inner diameter of the limiting ring is larger than the outer diameter of the rod, and/or the outer diameter of the limiting ring is smaller than the inner diameter of the tubular shell.