Sealing device for magnetorheological medium

Abstract

The sealing device comprises a base body, a first sealing part and a second sealing part, the base body is in an annular shape around the axis, and the first sealing part and the second sealing part are arranged on the inner side wall of the base body; the first sealing part comprises a first containing groove and a first sealing piece, the first containing groove is formed in the inner side wall of the base body, the first sealing piece is installed in the first containing groove, and the first sealing piece comprises a first sealing lip abutting against the shaft; the second sealing part comprises a second containing groove and a second sealing assembly, the second containing groove is formed in the inner side wall of the base body, the second sealing assembly is installed in the second containing groove, the second sealing assembly comprises a PTFE sealing ring, the inner side wall of the PTFE sealing ring abuts against the shaft, or the second sealing assembly comprises a polyurethane sealing ring, and the inner side wall of the polyurethane sealing ring abuts against the shaft. The inner side wall of the polyurethane sealing ring abuts against the shaft. According to the sealing device, the second sealing part is arranged on the side, close to the magnetorheological medium, of the sealing device, so that the magnetorheological medium is effectively sealed through the sealing device.

Description

TECHNICAL FIELD

[0001] The present application relates to the sealing technical field, and in particular to a sealing device for magneto-rheological medium. BACKGROUND

[0002] At present, the sealing medium of ordinary shock absorber is shock absorber oil, and the sealing product of rubber product can be sealed, but for the magneto-rheological shock absorber, because the sealing medium is a liquid with small iron powder particles, the existing sealing product of rubber product cannot meet the sealing requirement.

[0003] The iron powder is a solid medium with special physical properties, and the particles have a certain hardness and sharp edges. In the process of contacting with the traditional rubber sealing element, due to the problems of wear, penetration and aging, the traditional sealing element cannot effectively seal the sealing medium with iron powder, and there is a problem that the liquid with iron powder cannot be sealed. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the related technical problems, the purpose of the present application is to provide a sealing device for magneto-rheological medium, so as to solve the problem of sealing the liquid with iron powder.

[0005] In order to achieve the above purpose, the embodiments of the present application adopt the following technical solutions:

[0006] A sealing device for magneto-rheological medium, the magneto-rheological medium is distributed with ferromagnetic particles, the sealing device for magneto-rheological medium comprises a base body, a first sealing part and a second sealing part, wherein:

[0007] The base body is annular around the axis, the first sealing part and the second sealing part are arranged on the inner side wall of the base body, and the first sealing part is arranged away from the second sealing part and the magneto-rheological medium;

[0008] The first sealing part comprises a first accommodating groove and a first sealing element, the first accommodating groove is opened on the inner side wall of the base body in the circumferential direction, and the first sealing element is installed in the first accommodating groove, and the first sealing element comprises a first sealing lip abutting on the shaft;

[0009] The second sealing part comprises a second accommodating groove and a second sealing assembly, the second accommodating groove is opened on the inner side wall of the base body in the circumferential direction, and the second sealing assembly is installed in the second accommodating groove, and the second sealing assembly comprises a PTFE sealing ring, the inner side wall of the PTFE sealing ring abuts on the shaft, or the second sealing assembly comprises a polyurethane sealing ring, and the inner side wall of the polyurethane sealing ring abuts on the shaft.

[0010] Optionally, the sealing device for magneto-rheological medium further comprises a dustproof part, wherein:

[0011] The dustproof part is arranged on the inner side wall of the base body, and is arranged away from the magnetorheological medium relative to the first sealing part;

[0012] The dustproof part comprises a third accommodating groove and a dustproof sealing ring, the third accommodating groove is arranged on the inner side wall of the base body in the circumferential direction, and the dustproof sealing ring comprises a second sealing lip abutting against the shaft.

[0013] The second sealing assembly further comprises an O-shaped sealing ring, the O-shaped sealing ring is installed in the second accommodating groove, the O-shaped sealing ring is sleeved on the periphery of the PTFE sealing ring or the polyurethane sealing ring, the outer side wall of the O-shaped sealing ring abuts against the groove bottom of the second accommodating groove, and the inner side wall of the O-shaped sealing ring abuts against the outer side wall of the PTFE sealing ring or the polyurethane sealing ring.

[0014] Optionally, the cross section of the PTFE sealing ring is wedge-shaped, and the side of the PTFE sealing ring abutting against the shaft is provided with a wedge surface close to the magnetorheological medium.

[0015] Optionally, the cross section of the PTFE sealing ring is rectangular.

[0016] Optionally, the first sealing part comprises a first main body part, the first main body part is provided with a first outer peripheral lip part extending to the outer peripheral side in one direction along the axis, and is provided with a first inner peripheral lip part extending to the inner peripheral side in one direction, the first inner peripheral lip part abuts against the inner wall of the second accommodating groove, and the first outer peripheral lip part is configured to abut against the outer wall of the shaft.

[0017] Optionally, the polyurethane sealing ring comprises a second main body part, the second main body part is provided with a second outer peripheral lip part extending to the outer peripheral side in one direction along the axis, and is provided with a second inner peripheral lip part extending to the inner peripheral side in one direction, the second inner peripheral lip part abuts against the inner wall of the second accommodating groove, and the second outer peripheral lip part abuts against the outer wall of the shaft.

[0018] Optionally, the dustproof sealing ring comprises an elastic body part and a first clamping elastic part, the first clamping elastic part is sleeved on the side, away from the shaft, of the first end of the elastic body part, and is configured to abut the first end of the elastic body part against the third accommodating groove, the second sealing lip is arranged on the side, close to the shaft, of the second end of the elastic body part, and abuts against the shaft.

[0019] Optionally, the dustproof sealing ring further comprises a second clamping elastic part, the second clamping elastic part is arranged on the side, away from the shaft, of the second end of the elastic body part, and is configured to tightly abut the second sealing lip against the shaft.

[0020] Optionally, the base body is in a split structure, and comprises a first base body and a second base body, the first sealing part and the dustproof part are arranged on the inner side wall of the first base body, and the second sealing part is arranged on the inner side wall of the second base body.

[0021] Alternatively, the base is a one-piece structure.

[0022] The application has the following beneficial effects compared with the prior art:

[0023] 1. By arranging the second sealing part near the side of the magnetorheological medium, the second sealing part is provided with a PTFE sealing ring or a polyurethane sealing ring, so as to realize effective sealing of the magnetorheological medium;

[0024] 2. By the combination of the first sealing part and the second sealing part, double sealing of the magnetorheological medium is realized, and the sealing effect of the magnetorheological medium is improved;

[0025] 3. By additionally arranging an O-shaped sealing ring around the PTFE sealing ring or the polyurethane sealing ring, the PTFE sealing ring or the polyurethane sealing ring can be tightly attached to the shaft surface, and the sealing performance of the magnetorheological medium is further improved;

[0026] 4. The dustproof part is arranged, which can effectively prevent dust, impurities and the like in the outside from entering the inside of the sealing device, and is beneficial to prolong the service life of the sealing device. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate and understand the technical solutions in the embodiments of the application, the drawings needed to be used in the background and the embodiment description of the application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained according to the contents of the embodiments of the application and the drawings by those skilled in the art without creative labor.

[0028] Figure 1 is a structural schematic diagram of one embodiment of the sealing device for the magnetorheological medium provided by the application;

[0029] Figure 2 is a structural schematic diagram of one embodiment of the sealing device for the magnetorheological medium provided by the application, which is different from Figure 1 ;

[0030] Figure 3 is a structural schematic diagram of one embodiment of the sealing device for the magnetorheological medium provided by the application, which is different from Figure 1 and Figure 2 .

[0031] Figures 1 to 3 The following reference signs are included in

[0032] Base 10: first base 11, second base 12;

[0033] First seal portion 20: first housing groove 21, first seal 22, first main body portion 220, first outer peripheral lip portion 221, first inner peripheral lip portion 222;

[0034] Second seal portion 30: second housing groove 31, second seal assembly 32, PTFE seal ring 320, polyurethane seal ring 321, O-ring 322;

[0035] Shaft 40;

[0036] Dust-proof portion 50: third housing groove 51, dust-proof seal ring 52, second seal lip 520, elastomer portion 521, first clamping elastic member 522, second clamping elastic member 523. DETAILED DESCRIPTION

[0037] The present application will be described in further detail below with reference to the accompanying drawings.

[0038] For the purposes of promoting an understanding of the principles of the application, reference will now be made to the embodiments illustrated in the drawings. It is to be noted, however, that the application can be practiced without these specific details. In other instances, well known methods have not been described in detail in order not to unnecessarily obscure the application. It is to be understood that the drawings are not to scale, and that the specific dimensions shown are intended to be exemplary only. In addition, it is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. The use herein of "including," "comprising," "having," "containing," or "involving" and variations thereof is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in this specification and the appended claims, the singular forms "a," "an" and "the" include plural referents unless the content clearly dictates otherwise. Thus, for example, reference to "a component" includes a combination of two or more components, and the like.

[0039] Hereinafter, the arrow a direction (one side in the axis x direction) (refer to Figure 1 ) in the axis x direction is set as the outer side, and the arrow b direction (the other side in the axis x direction) (refer to Figure 1 ) in the axis x direction is set as the inner side. The inner side is specifically the side on which the object to be sealed is located, and the outer side is specifically the atmospheric side. In addition, in the direction perpendicular to the axis x (hereinafter, also referred to as "radial direction"), the arrow c direction (direction away from the axis x) (refer to Figure 1 ) is set as the outer peripheral side, and the arrow d direction (direction approaching the axis x) (refer to Figure 1The arrow d direction) is set to the inner peripheral side. In addition, the axis x is a virtual line.

[0040] Iron powder, as a solid medium with special physical properties, has particles with certain hardness and sharp edges. In the process of contacting with traditional rubber seals, relative movement caused by equipment operation and other factors will cause iron powder to continuously rub against the surface of the seal, causing the seal to wear out quickly, thereby destroying the sealing structure and leading to sealing failure. At the same time, rubber itself has microscopic pores, although these pores have little effect on the sealing of conventional fluid media, but for iron powder with smaller particle size, there is a risk of penetration, and this phenomenon becomes more and more obvious over time and with the aging and deformation of the seal. In addition, iron powder may also react with rubber, accelerating the aging process of rubber, reducing the elasticity and toughness of rubber seals, further weakening their sealing performance, and there is a problem that liquid with iron powder cannot be sealed.

[0041] Polyurethane (PU) and polytetrafluoroethylene (PTFE) have unique advantages in the field of sealing rings: polyurethane is suitable for dynamic sealing and high load environment due to its high elasticity, wear resistance and tear resistance; while PTFE is suitable for corrosive media and high temperature working conditions due to its extremely low friction coefficient, excellent chemical resistance and high temperature resistance. The combination of the two can meet the sealing needs in complex working conditions, for example, in hydraulic systems or chemical equipment, polyurethane provides elastic support, and PTFE provides low friction and corrosion resistance, thereby realizing an efficient and durable sealing solution.

[0042] Please refer to Figures 1 to 3 As shown in the figure, the embodiment provides a sealing device for a magneto-rheological medium, the magneto-rheological medium is distributed with ferromagnetic particles, and the sealing device for the magneto-rheological medium comprises a base body 10, a first sealing part 20 and a second sealing part 30, wherein: the base body 10 is annular around an axis, the first sealing part 20 and the second sealing part 30 are arranged on the inner side wall of the base body 10, and the first sealing part 20 is arranged away from the magneto-rheological medium relative to the second sealing part 30; the first sealing part 20 comprises a first accommodating groove 21 and a first sealing element 22, the first accommodating groove 21 is opened on the inner side wall of the base body 10 in the circumferential direction, and the first sealing element 22 is installed in the first accommodating groove 21, the first sealing element 22 comprises a first sealing lip 23 abutting on a shaft 40; the second sealing part 30 comprises a second accommodating groove 31 and a second sealing assembly 32, the second accommodating groove 31 is opened on the inner side wall of the base body 10 in the circumferential direction, and the second sealing assembly 32 is installed in the second accommodating groove 31, the second sealing assembly 32 comprises a PTFE sealing ring 320, the inner side wall of the PTFE sealing ring 320 abuts on the shaft 40, or the second sealing assembly 32 comprises a polyurethane sealing ring 321, the inner side wall of the polyurethane sealing ring 321 abuts on the shaft 40.

[0043] It can be seen that by arranging the second sealing part 30 on the side close to the magnetorheological medium, the second sealing part 30 is provided with the PTFE sealing ring 320 or the polyurethane sealing ring 321, so that effective sealing of the magnetorheological medium is achieved. Meanwhile, by arranging the first sealing part 20 and the second sealing part 30 on the inner side wall of the base body 10 and arranging the first sealing part 20 away from the magnetorheological medium relative to the second sealing part 30, a combined double-sealing structure is formed, which effectively prevents leakage of the magnetorheological medium and realizes sealing of the medium containing iron powder.

[0044] As an implementation form, the sealing device for the magnetorheological medium further comprises a dustproof part 50, wherein: the dustproof part 50 is arranged on the inner side wall of the base body 10 and is arranged away from the magnetorheological medium relative to the first sealing part 20; the dustproof part 50 comprises a third accommodating groove 51 and a dustproof sealing ring 52, the third accommodating groove 51 is arranged on the inner side wall of the base body 10 in the circumferential direction, and the dustproof sealing ring 52 comprises a second sealing lip 520 abutting against the shaft 40.

[0045] It can be seen that by arranging the dustproof part 50, external dust, impurities and the like can be effectively blocked from entering the inside of the sealing device, so that the magnetorheological medium is prevented from contacting the external dust, impurities and the like, thereby protecting the performance of the magnetorheological medium and prolonging the service life of the sealing device.

[0046] As an implementation form, the second sealing assembly 32 further comprises an O-shaped sealing ring 322, the O-shaped sealing ring 322 is arranged in the second accommodating groove 31, the O-shaped sealing ring 322 is sleeved on the periphery of the PTFE sealing ring 320 or the polyurethane sealing ring 321, the outer side wall of the O-shaped sealing ring 322 abuts against the groove bottom of the second accommodating groove 31, and the inner side wall of the O-shaped sealing ring 322 abuts against the outer side wall of the PTFE sealing ring 320 or the polyurethane sealing ring 321.

[0047] Specifically, the O-shaped sealing ring 322 is sleeved on the periphery of the PTFE sealing ring 320, the outer side wall of the O-shaped sealing ring 322 abuts against the groove bottom of the second accommodating groove 31, and the inner side wall of the O-shaped sealing ring 322 abuts against the outer side wall of the PTFE sealing ring 320.

[0048] Specifically, the O-shaped sealing ring 322 is sleeved on the periphery of the polyurethane sealing ring 321, the outer side wall of the O-shaped sealing ring 322 abuts against the groove bottom of the second accommodating groove 31, and the inner side wall of the O-shaped sealing ring 322 abuts against the outer side wall of the polyurethane sealing ring 321.

[0049] It can be seen that the elasticity of the O-shaped sealing ring 322 can compensate for the deformation of the PTFE sealing ring 320 or the polyurethane sealing ring 321 during work, so as to enhance the sealing performance between the sealing assembly, the accommodating groove and the shaft 40, further prevent leakage of the magnetorheological medium, and improve the overall sealing performance of the sealing device.

[0050] As an implementation form, the cross section of the PTFE sealing ring 320 is wedge-shaped, and the wedge-shaped surface is arranged close to the magnetorheological medium part on the side surface abutting the shaft 40.

[0051] It can be seen that the cross section of the PTFE sealing ring 320 is wedge-shaped and the wedge-shaped surface is arranged close to the magnetorheological medium part, so that the PTFE sealing ring 320 better fits the surface of the shaft 40 during work. With the action of the magnetorheological medium pressure, the wedge-shaped surface is more closely contacted with the shaft 40, further enhancing the sealing effect.

[0052] As an implementation form, the cross section of the PTFE sealing ring 320 is rectangular.

[0053] It can be seen that the cross section of the PTFE sealing ring 320 is rectangular, and the rectangular cross section of the PTFE sealing ring 320 is relatively simple in processing and manufacturing, and has lower cost. At the same time, the rectangular shape is easier to position and install when installed into the second accommodating groove 31, improving the assembly efficiency of the sealing device.

[0054] As an implementation form, the first sealing member 22 includes a first body part 220, the first body part 220 is provided with a first outer peripheral lip part 221 extending outwardly in one direction along the axis direction, and is provided with a first inner peripheral lip part 222 extending inwardly in one direction along the axis direction, the first inner peripheral lip part 222 abuts the inner wall of the second accommodating groove 31, and the first outer peripheral lip part 221 is configured to abut the outer wall of the shaft 40.

[0055] Specifically, the first outer peripheral lip part 221 extends from the first body part 220 inwardly along the axis x direction and outwardly along the outer peripheral direction. The first outer peripheral lip part 221 has an outer peripheral surface and an inner peripheral surface. The first outer peripheral lip part 221 is configured such that the outer peripheral surface abuts the outer peripheral wall surface of the second accommodating groove 31 on the outer peripheral side. The inner side surface of the first outer peripheral lip part 221 faces the inner side sealing surface of the second accommodating groove 31.

[0056] Specifically, the first inner peripheral lip part 222 extends from the first body part 220 inwardly along the axis x direction and inwardly along the inner peripheral direction. The first inner peripheral lip part 222 has an outer peripheral surface and an inner peripheral surface. The first inner peripheral lip part 222 is configured such that the inner peripheral surface abuts the surface of the shaft 40. The inner side surface of the first inner peripheral lip part 222 faces the inner side sealing surface of the second accommodating groove 31.

[0057] Specifically, the first sealing member 22 can be made of nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), acrylate rubber (ACM), or fluororubber (FKM).

[0058] As one embodiment, the polyurethane seal ring 321 includes a second main body portion, a second outer peripheral lip portion provided on the second main body portion so as to extend in one direction of the axis direction and outward in the peripheral direction, and a second inner peripheral lip portion provided on the second main body portion so as to extend in the one direction and inward in the peripheral direction, the second inner peripheral lip portion abutting against an inner wall of the first accommodation groove 21, and the second outer peripheral lip portion abutting against an outer wall of the shaft 40.

[0059] As one embodiment, the dust seal ring 52 includes an elastic body portion 521 and a first clamping elastic member 522, the first clamping elastic member 522 being provided on a side of a first end of the elastic body portion 521 away from the shaft 40, the first clamping elastic member 522 being configured to abut the first end of the elastic body portion 521 within the third accommodation groove 51, and a second seal lip 520 being provided on a side of a second end of the elastic body portion 521 close to the shaft 40, the second seal lip 520 abutting against the shaft 40.

[0060] Specifically, the first clamping elastic member 522 is installed inside the elastic body portion 521. The first clamping elastic member 522 is provided, for example, by being embedded in the peripheral end portion of the elastic body portion 521. The entire first clamping elastic member 522 can be embedded in the peripheral end portion of the elastic body portion 521, or a part of the first clamping elastic member 522 can be embedded in the peripheral end portion of the elastic body portion 521. The first clamping elastic member 522 is vulcanization-bonding to the elastic body portion 521, for example. In this case, the first clamping elastic member 522 is vulcanization-bonding to the elastic body portion 521 by integrally vulcanization-molding the base 10 and the first clamping elastic member 522, for example. The first clamping elastic member 522 is formed so as to apply a force to the elastic body portion 521 that presses the peripheral end portion of the elastic body portion 521 against the third accommodation groove 51.

[0061] As one embodiment, the dust seal ring 52 further includes a second clamping elastic member 523, the second clamping elastic member 523 being provided on the second end of the elastic body portion 521 and on a side away from the shaft 40, the second clamping elastic member 523 being configured to tighten the second seal lip 520 against the shaft 40.

[0062] Specifically, the second clamping elastic member 523 is installed inside the elastic body portion 521. The second clamping elastic member 523 is provided, for example, by being embedded in the peripheral end portion of the elastic body portion 521. The entire second clamping elastic member 523 can be embedded in the peripheral end portion of the elastic body portion 521, or a part of the second clamping elastic member 523 can be embedded in the peripheral end portion of the elastic body portion 521. The second clamping elastic member 523 is vulcanization-bonding to the elastic body portion 521, for example. In this case, the second clamping elastic member 523 is vulcanization-bonding to the elastic body portion 521 by integrally vulcanization-molding the base 10 and the second clamping elastic member 523, for example. The second clamping elastic member 523 is formed so as to apply a force to the elastic body portion 521 that presses the peripheral end portion of the elastic body portion 521 against the third accommodation groove 51.

[0063] It can be seen that the dustproof effect of the dustproof member is improved by the cooperation of the elastic body 521, the first clamping elastic member 522 and the second clamping elastic member 523.

[0064] As an implementation form, the base body 10 is in a split structure, the base body 10 includes a first base body 11 and a second base body 12, the first sealing part 20 and the dustproof part 50 are arranged on the inner side wall of the first base body 11, and the second sealing part 30 is arranged on the inner side wall of the second base body 12; or the base body 10 is in a unitary structure.

[0065] It can be seen that the base body 10 is in a split structure and is divided into the first base body 11 and the second base body 12, the two base bodies 10 can be machined respectively in the manufacturing process, the machining difficulty is reduced, and the production efficiency is improved. When maintaining, the corresponding base body 10 can be separately disassembled for replacement or repair, without the need of disassembling the entire sealing device, so that the maintenance cost and difficulty are reduced.

[0066] In the embodiments disclosed in the present application, the terms “mounting”, “connecting”, “connecting”, “fixing” and the like should be understood in a broad sense. For example, “connecting” can be fixed connection, detachable connection or integral connection; “connecting” can be direct connection or indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the embodiments disclosed in the present application can be understood according to the specific circumstances.

[0067] The above embodiments only illustrate the basic principles and characteristics of the present application, and the present application is not limited to the above examples. Without departing from the spirit and scope of the present application, the present application can have various changes and modifications, and these changes and modifications all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A sealing device for a magnetorheological medium, wherein ferromagnetic particles are distributed in the magnetorheological medium, characterized in that, The sealing device for magnetorheological media includes a base, a first sealing part, and a second sealing part, wherein: The substrate is annular around the axis, and the first sealing part and the second sealing part are disposed on the inner sidewall of the substrate. The first sealing part is disposed away from the magnetorheological medium relative to the second sealing part. The first sealing part includes a first receiving groove and a first sealing member. The first receiving groove is formed on the inner sidewall of the substrate in a circumferential direction. The first sealing member is installed in the first receiving groove. The first sealing member includes a first sealing lip that abuts against the shaft. The second sealing part includes a second receiving groove and a second sealing assembly. The second receiving groove is formed on the inner sidewall of the substrate in a circumferential direction. The second sealing assembly is installed in the second receiving groove. The second sealing assembly includes a PTFE sealing ring, the inner sidewall of which abuts against the shaft. Alternatively, the second sealing assembly includes a polyurethane sealing ring, the inner sidewall of which abuts against the shaft.

2. The sealing device for magnetorheological media according to claim 1, characterized in that, The sealing device for magnetorheological media further includes a dustproof section, wherein: The dustproof part is disposed on the inner sidewall of the substrate, and the dustproof part is disposed away from the magnetorheological medium relative to the first sealing part. The dustproof part includes a third receiving groove and a dustproof sealing ring. The third receiving groove is formed on the inner side wall of the substrate in a circumferential direction, and the dustproof sealing ring includes a second sealing lip that abuts against the shaft.

3. The sealing device for magnetorheological media according to claim 1 or 2, characterized in that, The second sealing assembly further includes an O-ring, which is installed in the second receiving groove. The O-ring is fitted around the PTFE sealing ring or the polyurethane sealing ring, with the outer side wall of the O-ring abutting the bottom of the second receiving groove and the inner side wall of the O-ring abutting the outer side wall of the PTFE sealing ring or the polyurethane sealing ring.

4. The sealing device for magnetorheological media according to claim 3, characterized in that, The PTFE sealing ring has a wedge-shaped cross-section, and the side of the PTFE sealing ring that abuts against the shaft near the magnetorheological medium has a wedge-shaped surface.

5. A sealing device for magnetorheological media according to claim 3, characterized in that, The PTFE sealing ring has a rectangular cross-section.

6. A sealing device for magnetorheological media according to claim 1, characterized in that, The first seal includes a first main body portion, the first main body portion having a first outer peripheral lip portion extending outward in one direction along the axial direction, the first main body portion having a first inner peripheral lip portion extending in the same direction inward, the first inner peripheral lip portion abutting against the inner wall of the second receiving groove, and the first outer peripheral lip portion abutting against the outer wall of the shaft.

7. A sealing device for magnetorheological media according to claim 1, characterized in that, The polyurethane sealing ring includes a second main body, a second outer peripheral lip extending outward in one direction along the axial direction, a second inner peripheral lip extending in the same direction in the same direction, the second inner peripheral lip abutting against the inner wall of the second receiving groove, and the second outer peripheral lip abutting against the outer wall of the shaft.

8. A sealing device for magnetorheological media according to claim 2, characterized in that, The dustproof sealing ring includes an elastomer portion and a first snap-fit ​​elastic member. The first snap-fit ​​elastic member is sleeved on the side of the first end of the elastomer portion away from the shaft. The first snap-fit ​​elastic member is configured to abut the first end of the elastomer portion against the third receiving groove. The second sealing lip is disposed on the side of the second end of the elastomer portion near the shaft and abuts against the shaft.

9. A sealing device for magnetorheological media according to claim 8, characterized in that, The dustproof sealing ring further includes a second snap-fit ​​elastic member, which is disposed at the second end of the elastic body portion and on the side away from the shaft. The second snap-fit ​​elastic member is configured to tightly abut the second sealing lip against the shaft.

10. A sealing device for magnetorheological media according to claim 2, characterized in that, The substrate has a split structure, comprising a first substrate and a second substrate. The first sealing part and the dustproof part are disposed on the inner sidewall of the first substrate, and the second sealing part is disposed on the inner sidewall of the second substrate. Alternatively, the substrate may be a one-piece structure.

Images