Sealing device, sealing assembly and device with a rotating shaft

Abstract

The present invention discloses a sealing device, a sealing assembly and a device with a rotating shaft. A sealing device for use with a rotary shaft seal, the body of the rotary shaft seal being configured to pass through the rotating shaft and including a sealing portion that forms a dynamic sealing fit with the rotating shaft. The sealing device includes: an annular body configured to pass through the rotating shaft, the annular body including opposite first and second annular portions. The first annular portion defines a static sealing surface to form a static sealing fit with the rotating shaft, and the second annular portion defines a dynamic sealing surface to form a dynamic sealing fit with a portion of the body of the rotary shaft seal adjacent to the sealing portion. The sealing device provided by the present invention can effectively prevent the wear of the rotary shaft seal and the rotating shaft by external contaminants, extend the service life of the rotary shaft seal and the rotating shaft, and is easy to be integrated into a device with a rotating shaft and a dynamic seal on the rotating shaft.

Description

Technical Field

[0001] The present invention relates to a device for achieving sealing with respect to a device having a rotating shaft. More specifically, it relates to a sealing device for use with a rotary shaft seal, a sealing assembly for a rotating shaft, and a device having a rotating shaft. Background Art

[0002] A rotary shaft seal is a seal that can prevent the leakage of pressurized fluid (such as lubricating oil) to the outside, and is widely used in devices having a rotating shaft and requiring sealing of oil, gas, water, etc. (such as gas turbines, steam turbines, water turbines, pumps, household appliances, engines, motorcycles, etc.). However, when the rotary shaft seal is installed on the rotating shaft, external contaminants (such as dust, other impurities, etc.) may enter at the joint between the rotating shaft and the rotary shaft seal (such as near the sealing lip) during the rotation of the rotating shaft, exacerbating the wear of the rotating shaft and the rotary shaft seal, thereby causing the failure of the rotary shaft seal.

[0003] In the prior art, a possible solution is to use a mechanical seal, the disadvantage of which is that when the mechanical seal wears, it requires the manufacturer to send professional personnel for replacement and maintenance, and the installation and maintenance are troublesome and costly. Another possible solution is to use multiple (such as two, three, etc.) rotary shaft seals, the disadvantages of which are complex structure, high cost, and inability to effectively prevent external contaminants from entering, and can only delay the entry of external contaminants limitedly, because the delay in time does not increase multiplicatively with the increase in the number of rotary shaft seals. Summary of the Invention

[0004] The present invention solves the problem that the current rotary shaft seal fails prematurely due to wear caused by external contaminants entering the joint between the rotating shaft and the rotary shaft seal by providing a sealing device for use with a rotary shaft seal, a sealing assembly for a rotating shaft, and a device having a rotating shaft.

[0005] A first aspect of the present invention provides a sealing device for use with a rotary shaft seal. The body of the rotary shaft seal is configured to pass through a rotating shaft and includes a sealing portion that forms a dynamic sealing fit with the rotating shaft. The sealing device includes: an annular body configured to pass through the rotating shaft, the annular body including opposite first and second annular portions. Wherein, the first annular portion defines a static sealing surface to form a static sealing fit with the rotating shaft, and the second annular portion defines a dynamic sealing surface to form a dynamic sealing fit with a portion of the body of the rotary shaft seal adjacent to the sealing portion.

[0006] A second aspect of the present invention provides a sealing assembly for a rotating shaft. The sealing assembly includes: a rotating shaft seal, the body of the rotating shaft seal is configured to pass through the rotating shaft and includes a sealing portion that forms a dynamic sealing fit with the rotating shaft; a seal, the seal includes: an annular body, arranged to pass through the rotating shaft, the annular body includes opposite first and second annular portions, wherein the first annular portion defines a static sealing surface to form a static sealing fit with the rotating shaft, and the second annular portion defines a dynamic sealing surface to form a dynamic sealing fit with a portion of the body of the rotating shaft seal adjacent to the sealing portion.

[0007] Further according to any one or more of the foregoing first and second aspects, the sealing device or sealing assembly as outlined above may also include one or more of the following preferred forms.

[0008] In some preferred forms, the annular body further includes: a transition portion connecting the first annular portion and the second annular portion, the transition portion defining a concave surface.

[0009] In some preferred forms, the second annular portion further defines a connecting surface, the connecting surface being disposed between the dynamic sealing surface and the concave surface.

[0010] In some preferred forms, the connecting surface is configured to form a clearance fit with the rotating shaft.

[0011] In some preferred forms, the annular body further includes: a flanging structure extending outward from the outside of the dynamic sealing surface, such that when the dynamic sealing surface forms the dynamic sealing fit with the body of the rotating shaft seal, the flanging structure extends toward the rotating shaft seal side.

[0012] In some preferred forms, the second annular portion is made of a flexible material.

[0013] A third aspect of the present invention provides a device having a rotating shaft, the device including the sealing assembly according to the foregoing second aspect.

[0014] A fourth aspect of the present invention provides a device having a rotating shaft, the device including: a rotating shaft seal, the body of the rotating shaft seal passes through the rotating shaft and includes a sealing portion that forms a dynamic sealing fit with the rotating shaft; a seal, the seal includes: an annular body, the annular body passes through the rotating shaft, wherein the annular body defines a static sealing surface that forms a static sealing fit with the rotating shaft, and defines a dynamic sealing surface that forms a dynamic sealing fit with a portion of the body of the rotating shaft seal adjacent to the sealing portion.

[0015] Further according to the foregoing fourth aspect, the device as outlined above may also include one or more of the following preferred forms.

[0016] In some preferred forms, the annular body has a flexible material.

[0017] In some preferred forms, the annular body further defines a connecting surface connecting the static sealing surface and the dynamic sealing surface, wherein the connecting surface has a curved profile.

[0018] Compared with the prior art, the sealing structure according to the present invention can effectively prevent the wear of the rotary shaft seal and the rotary shaft by external pollutants, effectively extend the service life of the rotary shaft seal and the rotary shaft, be easily integrated into equipment with a rotary shaft and a dynamic seal on the rotary shaft, be easy to replace and maintain, and have a lower cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The embodiments are illustrated and explained with reference to the accompanying drawings. These drawings are used to illustrate the basic principles and thus only show the aspects necessary for understanding the basic principles. These drawings are not to scale. In the drawings, the same reference numerals denote the same or similar features.

[0020] Figure 1 A schematic diagram of an apparatus including a sealing structure for a rotary shaft in the prior art is shown.

[0021] Figure 2 Shows Figure 1 A partially enlarged view of the sealing structure of the apparatus.

[0022] Figure 3 A schematic diagram of an apparatus including a sealing structure for a rotary shaft according to an embodiment of the present invention is shown.

[0023] Figure 4 Shows Figure 3 A partially enlarged view of the sealing structure of the apparatus.

[0024] Figure 5 A schematic diagram of an apparatus including a sealing structure for a rotary shaft according to an embodiment of the present invention is shown.

[0025] Figure 6 Shows Figure 5 A partially enlarged view of the sealing structure of the apparatus.

[0026] Figure 7 An exemplary apparatus employing a sealing structure for a rotary shaft according to an embodiment of the present invention is shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In the following detailed description of the preferred embodiments, reference will be made to the accompanying drawings that form a part of the present invention. The accompanying drawings illustrate, by way of example, specific embodiments capable of implementing the present invention. The exemplary embodiments are not intended to exhaust all embodiments according to the present invention. It will be understood that other embodiments may be utilized and structural or logical modifications may be made without departing from the scope of the present invention. Accordingly, the following detailed description is not restrictive, and the scope of the present invention is defined by the appended claims.

[0028] First, the terms involved in the specification are described. In this document, a rotary shaft seal may also be referred to as a rotary oil seal, which is a sealing structure for a rotary shaft different from a mechanical seal. The purpose of a rotary shaft seal is to act as a physical barrier to retain a fluid, such as lubricating oil, in a certain position; and to prevent the fluid from leaking to the outside even under a certain pressure (e.g., high pressure).

[0029] As mentioned above, when a rotary shaft seal is installed on a rotary shaft, external contaminants (e.g., dust, other impurities, etc.) may enter at the mating area between the rotary shaft and the rotary shaft seal (e.g., near the sealing lip) during the rotation of the rotary shaft, exacerbating the wear of the rotary shaft and the rotary shaft seal, thereby causing the failure of the rotary shaft seal.

[0030] Generally, the prior art uses two or more rotary shaft seals to solve the above problems. Figure 1 FIG. shows a schematic diagram of an apparatus 100 including a sealing structure for a rotary shaft in the prior art, and Figure 2 shows Figure 1 a partially enlarged view 200 of the sealing structure.

[0031] Referring to Figure 1 , the apparatus 100 includes a rotary shaft 101 and a plurality of rotary shaft seals 102 (shown, two). The rotary shaft 101 rotates about an axis, and the rotary shaft seals 102 pass through the rotary shaft 101 and are coaxial with the rotary shaft 101. The plurality of rotary shaft seals 102 constitute a sealing structure for the rotary shaft.

[0032] Referring to Figure 2, the rotary shaft seal 102 includes a body configured to pass through the rotary shaft 101, and the body includes a sealing portion 201 (such as a sealing lip). The sealing portion 201 forms a dynamic sealing fit with the rotary shaft 101 (for example, an interference dynamic fit), that is, the rotary shaft seal 102 does not rotate synchronously with the rotary shaft 101. The body includes a portion 202 adjacent to the sealing portion 201. Due to the dynamic seal, during rotation, the relative movement between the rotary shaft 101 and the rotary shaft seal 102 will cause wear, especially between the rotary shaft 101 and the sealing portion 201 of the rotary shaft seal 102. In some cases, for example, as the operating speed of the shaft changes and the working environment temperature changes, dry friction occurs between the rotary shaft 101 and the rotary shaft seal 102, especially its sealing portion 201, resulting in wear. When external contaminants (such as dust or other impurities) enter the portion 202 along the path indicated by, for example, curve 206, it will exacerbate the wear of the rotary shaft 101 and the rotary shaft seal 102, especially its sealing portion 201, leading to the failure of the rotary shaft seal 102. By serially arranging multiple rotary shaft seals 102 cooperating with the rotary shaft 101, it is possible to use other rotary shaft seals 102 to prevent external contaminants from damaging the seal of the rotary shaft 101 in the case where one rotary shaft seal fails due to external contaminants.

[0033] For example, taking the rotary shaft seal 102 as a skeleton oil seal as an example for illustration rather than limitation, it includes a body made of an elastic material (such as rubber, elastic plastic, etc.). The body includes an inner ring 203 and an outer ring 204, and the inner ring 203 defines a protruding sealing portion 201 (such as a sealing lip). Lubricating oil is provided on one side of the sealing portion 201, and a stable hydrodynamic oil film is formed between the interface of the sealing portion 201 and the rotary shaft 101 under boundary lubrication. This oil film usually has a certain pressure to prevent the lubricating oil from flowing outwards. The body may also include a spring embedded in the inner ring 203 to enhance the self-tightening force of the shaft seal 102. The body may also include a metal skeleton embedded in the outer ring 204 of the body and the portion connecting the outer ring 204 and the inner ring 203, and the metal skeleton can be used to increase the mechanical strength of the rotary shaft seal 102 and facilitate the positioning of the rotary shaft seal 102 during installation. The body may also include a dust-proof portion 205 (such as a dust-proof lip) to prevent dust or impurities from entering the side of the sealing portion 201 from above. However, the dust-proof portion 205 cannot prevent dust or impurities from entering the side of the sealing portion 201 from below. When external contaminants (such as dust or other impurities) enter the portion 202 adjacent to the sealing portion 201 from below along the path indicated by, for example, curve 206, it will exacerbate the wear of the rotary shaft 101 and the rotary shaft seal 102, especially its sealing portion 201, leading to the failure of the rotary shaft seal 102.

[0034] However, no matter what type and number of multiple rotary shaft seals 102 are adopted, it will lead to complex structure, high cost, and cannot effectively prevent external pollutants from entering. It can only delay the entry of external pollutants limitedly, because the delay in time does not increase multiplicatively with the increase in the number of rotary shaft seals.

[0035] Aiming at the problem in the prior art that the rotary shaft seal fails prematurely due to external pollutants entering the joint between the rotary shaft and the rotary shaft seal, the present invention provides a sealing device for use with a rotary shaft seal, a sealing assembly for a rotary shaft, and a device having a rotary shaft.

[0036] Figure 3 FIG. shows a schematic diagram of a device 300 including a sealing structure for a rotary shaft according to an embodiment of the present invention. The device 300 includes a rotary shaft 301, at least one rotary shaft seal 302 (shown, one), and a sealing device (or seal) 303 for use with the rotary shaft seal 302. The at least one rotary shaft seal 302 and the sealing device 303 form a sealing assembly (or sealing structure) for the rotary shaft. The rotary shaft 301 may be similar to the rotary shaft 101 referred to above Figure 1 and Figure 2 described, and the rotary shaft seal 302 may be similar to the rotary shaft seal 102 referred to above Figure 1 and Figure 2 described, and will not be elaborated herein.

[0037] Figure 4 FIG. shows Figure 3Partial enlarged view 400 of the sealing structure of device 300. The sealing device (or seal) 303 includes an annular body configured to pass through the rotating shaft 301. The annular body includes opposite first annular portion 401 and second annular portion 402. The first annular portion 401 defines a static sealing surface 403 to form a static sealing fit (e.g., interference static fit) with the rotating shaft 301, that is, the static sealing surface 403 tightly surrounds the rotating shaft 301 and rotates synchronously with the rotating shaft 301 (i.e., the sealing device 303 rotates synchronously with the rotating shaft 301). The second annular portion 402 defines a dynamic sealing surface 404 to form a dynamic sealing fit with a portion (such as portion 202) of the adjacent sealing portion (such as sealing portion 201) of the body of a rotary shaft seal 302. For example, the dynamic sealing surface 404 abuts (e.g., closely abuts) the surface of this portion of the rotary shaft seal 302. Since the rotary shaft seal 302 does not rotate synchronously with the rotating shaft 301 and the sealing device 303 rotates synchronously with the rotating shaft 301, a dynamic sealing fit is formed between the rotary shaft seal 302 and the sealing device 303. Since the sealing between the sealing device 303 and the rotating shaft 301 is a static seal and no wear occurs, and the sealing between the sealing device 303 and the rotary shaft seal 302 is a dynamic seal, compared with the prior art, this sealing device can effectively prevent the wear of the rotary shaft seal and the rotating shaft by external contaminants (e.g., entering near the sealing portion of the rotary shaft seal 302 along the path indicated by curve 206), effectively extend the service life of the rotary shaft seal and the rotating shaft, and this sealing device is easily integrated into a device with a rotating shaft and a dynamic seal on the rotating shaft, is easy to replace and maintain, and has a lower cost.

[0038] In an embodiment, the annular body of the sealing device 303 further includes a transition portion 405 connecting the first annular portion 401 and the second annular portion 402. The transition portion 405 defines a recessed surface 406. By providing the recessed surface 406, the elastic force caused by the deformation on their contact surface can be effectively relieved when the dynamic sealing surface 404 abuts the body of the rotary shaft seal 302 to form a dynamic sealing fit (when installing the sealing device 303, for example, in the case of pushing the sealing device 303 (e.g., by pushing the first annular portion 401) along the axis of the rotating shaft 301 towards the rotary shaft seal 302, preventing the dynamic sealing surface 404 from being overstressed when contacting the body of the rotary shaft seal 302), thereby preventing the elastic force from causing deformation of the rotary shaft seal 302 (e.g., displacement, or deformation of the sealing portion), and this deformation may lead to the failure of the rotary shaft seal 302.

[0039] In an embodiment, the second annular portion 402 further defines a connecting surface 407, and the connecting surface 407 is disposed between the dynamic sealing surface 404 and the concave surface 406. In a further embodiment, the connecting surface 407 is configured to form a clearance fit with the rotating shaft 301. By providing the connecting surface 406, the elastic force generated by the deformation of the dynamic sealing surface 404 when contacting the body of the rotary shaft seal 302 can be further released, and the wear between the annular body and the rotating shaft 301 can be prevented through the clearance between the connecting surface and the rotating shaft 301.

[0040] In an embodiment, the annular body of the sealing device 303 further includes a flanging structure 408 extending outward from the outer side of the driven sealing surface 404, such that when the dynamic sealing surface 404 forms a dynamic sealing fit with the body of the rotary shaft seal 302, the flanging structure 408 extends toward the side of the rotary shaft seal 302. By providing the flanging structure 408, external contaminants (such as dust or other impurities, etc.) can be prevented from entering the dynamic sealing surface 404, and further preventing external contaminants from entering the vicinity of the sealing portion of the rotary shaft seal 302, thereby preventing wear of the rotary shaft seal and the rotating shaft. In addition, the flanging structure 408 can also effectively prevent the fluid (such as lubricating oil) provided on one side of the rotary shaft seal 302 from flowing out. For example, when the rotary shaft seal 302 is a skeleton oil seal, the flanging structure 408 can extend between the inner ring and the outer ring of the rotary shaft seal 302 and extend toward the portion connecting the inner ring and the outer ring.

[0041] In an embodiment, the second annular portion 402 is made of a flexible material. For example, the second annular portion 402 or the entire annular body may be made of a flexible material. By providing the second annular portion 402 made of a flexible material, a flexible seal can be formed between the dynamic sealing surface 404 and the body of the rotary shaft seal 302, so that a stable sealing effect can be maintained under the influence of mechanical vibration and the change of the elastic force of the contact surface, while preventing wear caused by dynamic sealing. The flexible material may be, for example, one of rubber, silica gel, and soft plastic, and the rubber may include but is not limited to nitrile rubber, acrylate rubber, silicone rubber, fluororubber, neoprene rubber, etc.

[0042] According to Figure 3 and Figure 4 The sealing device, sealing assembly and equipment according to the embodiments of can effectively prevent the wear of the rotary shaft seal and the rotating shaft by external contaminants, extend the service life of the rotary shaft seal and the rotating shaft, and the sealing structure is easy to install, replace and maintain.

[0043] Figure 5FIG. 0 shows a schematic view of an apparatus 500 including a sealing structure for a rotating shaft according to an embodiment of the present invention. The apparatus 500 includes a rotating shaft 501, at least one rotating shaft seal 502 (shown, one), and a seal 503 for use with the rotating shaft seal 502. The at least one rotating shaft seal 502 and the seal 503 constitute a sealing structure for the rotating shaft. The rotating shaft 501 may be similar to the rotating shaft 101 described above with reference to Figure 1 and Figure 2 and the rotating shaft seal 502 may be similar to the rotating shaft seal 102 described above with reference to Figure 1 and Figure 2 and will not be described in detail.

[0044] Figure 6 FIG. shows Figure 5 a partial enlarged view 600 of the sealing structure of the apparatus 500. The seal 503 includes an annular body that passes through the rotating shaft 501. The annular body of the seal 503 defines a static sealing surface 601 that forms a static sealing fit with the rotating shaft 501, and defines a dynamic sealing surface 602 that forms a dynamic sealing fit with a portion (such as portion 202) of a neighboring sealing portion (such as sealing portion 201) of the body of the rotating shaft seal 502.

[0045] In an embodiment, the annular body of the seal 503 has a flexible material. By providing an annular body with a flexible material, a flexible seal can be formed between the dynamic sealing surface 601 and the body of the rotating shaft seal 502, so that a stable sealing effect can be maintained under the influence of mechanical vibrations and changes in the contact surface elastic force, while preventing wear caused by dynamic sealing. The flexible material may be, for example, one of rubber, silica gel, and soft plastic, and the rubber may include, but is not limited to, nitrile rubber, acrylate rubber, silicone rubber, fluororubber, neoprene, etc.

[0046] In an embodiment, the annular body of the seal 503 further defines a connecting surface 603 that connects the static sealing surface 601 and the dynamic sealing surface 602, and the connecting surface 603 has a curved profile. In one example, the static sealing surface 601 and the dynamic sealing surface 602 may be co-circular surfaces, so that the connecting surface 603 has a curved profile. In another example, the static sealing surface 601 and the dynamic sealing surface 602 may be on a polygonal surface, so that the connecting surface 603 has a curved profile. By providing a connecting surface 603 with a curved profile, the elastic force generated by the deformation of the dynamic sealing surface 602 when contacting the body of the rotating shaft seal 502 can be effectively relieved, thereby preventing the elastic force from causing deformation of the rotating shaft seal 502 (such as displacement or deformation of the sealing portion), and this deformation may lead to the failure of the rotating shaft seal 502.

[0047] According to Figure 5 and Figure 6The device of the embodiment can effectively prevent the wear of the rotary shaft seal and the rotary shaft by external pollutants, extend the service life of the rotary shaft seal and the rotary shaft, and the sealing structure is easy to install, replace and maintain.

[0048] Figure 7 FIG. 700 shows an exemplary device 700 employing a sealing structure for a rotary shaft according to an embodiment of the present invention. The exemplary device 700 is a submersible water pump, including a motor rotating shaft 701, a rotary shaft seal 702, a seal 703, an impeller 704 coupled to the motor rotating shaft 701, a water pump sealing housing 705, a motor electrical part 706 (such as a stator and rotor, leads, capacitors, etc.), an O-ring 707, and a motor front end cover 708. The rotary shaft seal 702 and the seal 703 constitute a sealing structure for the rotary shaft 701. The motor rotating shaft 701 can be any one of the rotary shafts 101, 301, 501 described above with reference to Figures 1 - 6 and the rotary shaft seal 702 can be any one of the rotary shaft seals 102, 302, 502 described above with reference to Figures 1 - 6 and the seal 703 can be any one of the sealing devices (or seals) 303 described above with reference to Figure 3 and Figure 4 or any one of the seals 503 described above with reference to Figure 5 and Figure 6 and.

[0049] The rotation of the motor rotating shaft 701 of the submersible water pump 700 drives the impeller 704 to rotate, and the rotation of the impeller 704 drives the water to flow. During the operation of the submersible water pump 700, the water pump is completely immersed in water, so it is necessary to ensure the sealing of the motor electrical part. As Figure 7 shown, the motor electrical part 706 is sealed between the water pump sealing housing 705 and the motor front end cover 708. The O-ring 707 and the rotary shaft seal 706 are used for sealing between the water pump sealing housing 705 and the motor front end cover 708. Among them, the O-ring 707 is used for static sealing, and the rotary shaft seal 706 is used for dynamic sealing. However, relative movement will occur during the rotation of the motor during dynamic sealing, resulting in wear. Once external pollutants (such as dust, other impurities, etc.) enter the sealing surface, the wear of the sealing surface will be aggravated. Different from the prior art, by adding a seal 703 outside the rotary shaft seal 702, the seal 703 can cooperate with the motor rotating shaft 701 and the rotary shaft seal 702 according to the foregoing embodiments, so as to effectively block external pollutants (such as dust, other impurities, etc.) from entering between the motor rotating shaft 701 and the rotary shaft seal 702, effectively prevent the failure of the rotary shaft seal 702, and ensure the sealing of the motor electrical part 706.

[0050] Thus, although the present invention has been described with reference to specific examples, these specific examples are merely illustrative and not restrictive of the present invention. It will be apparent to those of ordinary skill in the art that changes, additions, or deletions can be made to the disclosed embodiments without departing from the spirit and scope of the present invention.

Claims

1. A sealing device for use with a rotary shaft seal, wherein the body of the rotary shaft seal is configured to pass through a rotating shaft and includes a sealing portion that forms a dynamic seal with the rotating shaft, characterized in that: The sealing device comprises: an annular body configured to pass through the rotating shaft, the annular body comprising a first annular portion and a second annular portion opposite to each other, in, The first annular portion defines a static sealing surface to form a static sealing fit with the rotating shaft, The second annular portion defines a dynamic sealing surface for forming a dynamic sealing engagement with a portion of the body of the rotary shaft seal adjacent the sealing portion; The annular body further includes: a flange structure extending outward from the outer side of the dynamic sealing surface, so that when the dynamic sealing surface forms the dynamic seal with the body of the rotary shaft seal, the flange structure extends toward the rotary shaft seal side.

2. The sealing device according to claim 1, characterized in that The annular body further comprises: A transition portion connects the first annular portion and the second annular portion, the transition portion defining a concave surface.

3. The sealing device according to claim 2, characterized in that The second annular portion further defines a connecting surface disposed between the dynamic sealing surface and the recessed surface.

4. The sealing device according to claim 3, characterized in that The connecting surface is configured to form a clearance fit with the rotating shaft.

5. The sealing device according to claim 1, characterized in that The second annular portion comprises a flexible material.

6. A sealing assembly for a rotating shaft, characterized in that: The sealing assembly comprises: A rotary shaft seal, wherein the body of the rotary shaft seal is configured to pass through the rotating shaft and includes a sealing portion that forms a dynamic seal with the rotating shaft; A sealing member, comprising: an annular body, arranged to pass through the rotating shaft, the annular body comprising a first annular portion and a second annular portion opposite to each other, in, The first annular portion defines a static sealing surface to form a static sealing fit with the rotating shaft, The second annular portion defines a dynamic sealing surface for forming a dynamic sealing engagement with a portion of the body of the rotary shaft seal adjacent the sealing portion; The annular body further includes: a flange structure extending outward from the outer side of the dynamic sealing surface, so that when the dynamic sealing surface forms the dynamic seal with the body of the rotary shaft seal, the flange structure extends toward the rotary shaft seal side.

7. The sealing assembly according to claim 6, wherein: The annular body further comprises: A transition portion connects the first annular portion and the second annular portion, the transition portion defining a concave surface.

8. The sealing assembly according to claim 7, wherein: The second annular portion further defines a connecting surface disposed between the dynamic sealing surface and the recessed surface.

9. The sealing assembly according to claim 8, wherein: The connecting surface is configured to form a clearance fit with the rotating shaft.

10. The sealing assembly according to claim 6, wherein: The second annular portion comprises a flexible material.

11. A device having a rotating shaft, characterized in that The apparatus comprises a sealing assembly according to any one of claims 6-10.

12. A device having a rotating shaft, characterized in that The device comprises: A rotary shaft seal, the body of which passes through the rotary shaft and includes a sealing portion that forms a dynamic seal with the rotary shaft; A sealing member, comprising: an annular body, the annular body passing through the rotating shaft, wherein the annular body defines a static sealing surface for forming a static sealing fit with the rotating shaft, and defines a dynamic sealing surface for forming a dynamic sealing fit with a portion of the body of the rotary shaft seal adjacent to the sealing portion; The annular body further defines a connection surface connecting the static sealing surface and the dynamic sealing surface.

13. The device according to claim 12, characterized in that The annular body comprises a flexible material.

14. The device according to claim 12, characterized in that The connecting surface has a curved contour.

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