Magnetic medium sealing device resistant to multidirectional vibration

Abstract

The invention discloses a multidirectional-vibration-resistant magnetic medium sealing device which comprises a shell, a rotating shaft, a sealing assembly and a vibration reduction assembly, the rotating shaft is arranged on the shell in a penetrating mode and provided with a shaft sleeve, the periphery of the shaft sleeve is sleeved with a sealing sleeve, and the sealing sleeve is provided with a barrel part protruding outwards; the magnetic conductive shell is annularly arranged in the circumferential direction of the rotating shaft, the first permanent magnet and the second permanent magnet are arranged in the axial direction of the rotating shaft at intervals and are both connected with the magnetic conductive shell in a sealed mode, sealing gaps are reserved between the cylinder part and the first permanent magnet and between the cylinder part and the second permanent magnet, and pole teeth protruding towards the sealing gaps are arranged on the upper end face and the lower end face of the cylinder part. The vibration reduction assembly comprises a vibration reduction shell and a third permanent magnet, the vibration reduction shell is connected with the shaft sleeve and used for containing a magnetic medium, and the third permanent magnet is suspended in the magnetic medium in the vibration reduction shell. According to the multi-directional vibration resistant magnetic medium sealing device, the sealing failure risk caused by vibration of the rotating shaft can be reduced, and the reliability of the sealing device is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic sealing, in particular to a magnetic medium sealing device capable of resisting multi-directional vibration. Background Art

[0002] Magnetic medium seals use spatially distributed magnetic induction intensity differences to create a directional binding force on the magnetic medium, causing the magnetic medium to prevent the leakage and flow of the sealed fluid, thereby achieving a sealing effect. However, the performance of magnetic medium seals is highly dependent on a very small sealing gap. When the external environment causes the application equipment to vibrate, the magnetic medium seal will also vibrate with it. If the vibration amplitude exceeds the sealing gap value, the magnetic medium seal pole teeth will interfere with and rub against the rotating shaft, causing damage. Even if the vibration amplitude does not reach the sealing gap value, the circumferential unevenness of the sealing gap caused by vibration reduces the pressure resistance of the larger gap side, still posing the risk of seal failure. Therefore, vibration has a significant impact on the performance of magnetic medium seals, even affecting the operational reliability of the equipment. The design of an adaptive magnetic medium seal that can withstand multi-directional vibration has become a technical challenge that needs to be solved urgently. Summary of the Invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention provides a magnetic medium sealing device that is resistant to multi-directional vibrations. The magnetic medium sealing device that is resistant to multi-directional vibrations can reduce the risk of sealing failure caused by shaft vibration and improve the reliability of the sealing device.

[0005] The magnetic medium sealing device resistant to multi-directional vibration of the embodiment of the present invention includes: a shell and a rotating shaft, the shell has a accommodating cavity, the rotating shaft is passed through the shell and the rotating shaft includes a rotating shaft body and a shaft sleeve, the shaft sleeve sealing sleeve is arranged on the rotating shaft body; a sealing assembly, the sealing assembly includes a sealing sleeve, a first permanent magnet, a second permanent magnet and a magnetic shell, the sealing sleeve surrounds the outer circumference of the shaft sleeve and is sealed with the shaft sleeve, the sealing sleeve has a cylindrical portion protruding outward along the radial direction of the rotating shaft and extending in an annular shape along the circumference of the rotating shaft, the magnetic shell is sealed with the inner circumferential surface of the shell and is arranged in an annular shape along the circumference of the rotating shaft The first permanent magnet and the second permanent magnet are arranged at intervals in the axial direction of the rotating shaft and are both sealed with the magnetic shell, the cylindrical body is located between the first permanent magnet and the second permanent magnet, and a sealing gap is reserved between the cylindrical body and the first permanent magnet and the second permanent magnet, and pole teeth protruding toward the sealing gap are provided on the upper and lower end surfaces of the cylindrical body; a vibration damping assembly, the vibration damping assembly includes a vibration damping shell and a third permanent magnet, the vibration damping shell surrounds the outer circumference of the rotating shaft and is connected to the sleeve, the vibration damping shell is used to accommodate a magnetic medium, and the third permanent magnet is suspended in the magnetic medium in the vibration damping shell.

[0006] The magnetic medium sealing device resistant to multi-directional vibration of an embodiment of the present invention, the sealing assembly includes a sealing sleeve, a first permanent magnet, a second permanent magnet and a magnetic shell, the sealing sleeve surrounds the outer circumference of the sleeve and is sealed with the sleeve, the sealing sleeve has a cylindrical portion that protrudes outward along the radial direction of the rotating shaft and extends in a ring shape along the circumference of the rotating shaft, the magnetic shell is sealed with the inner circumferential surface of the shell, the first permanent magnet and the second permanent magnet are arranged at intervals in the axial direction of the rotating shaft and are both sealed with the magnetic shell, the cylindrical portion is located between the first permanent magnet and the second permanent magnet, and a sealing gap is reserved between the cylindrical portion and the first permanent magnet and the second permanent magnet, and a convex portion facing the sealing gap is provided on the upper and lower end surfaces of the cylindrical portion. The pole teeth are exposed, and the vibration damping assembly includes a vibration damping shell and a third permanent magnet. The vibration damping shell surrounds the outer circumference of the rotating shaft and is connected to the sleeve. The vibration damping shell is used to accommodate a magnetic medium. The third permanent magnet is suspended in the magnetic medium in the vibration damping shell. As a result, the sealing gap formed by the cylindrical body and the first permanent magnet and the second permanent magnet is perpendicular to the axial direction of the rotating shaft. The sealing performance is not affected by the radial vibration of the rotating shaft, which can effectively improve the reliability of the sealing device. At the same time, when the rotating shaft vibrates in the axial, radial or other directions, the permanent magnet in the vibration damping assembly oscillates in the magnetic medium, which can adaptively dissipate the energy of the vibration of the rotating shaft in all directions, effectively reduce the vibration, effectively avoid the component interference problem caused by the vibration of the rotating shaft in all directions, and improve the reliability of the sealing device.

[0007] In some embodiments, the sealing assemblies are arranged in a plurality of groups at intervals along the axial direction of the rotating shaft, and / or the vibration reduction assemblies are arranged in a plurality of groups at intervals along the axial direction of the rotating shaft.

[0008] In some embodiments, multiple groups of the sealing assemblies and multiple groups of the vibration damping assemblies are alternately arranged in the axial direction of the rotating shaft.

[0009] In some embodiments, the magnetic shell includes a magnetic body and a magnetic end cover, the magnetic body includes an outer peripheral plate sealed with the inner peripheral surface of the shell and an annular bottom plate connected to one end of the outer peripheral plate and protruding radially inward along the rotating shaft, the magnetic end cover is connected to the other end of the outer peripheral plate and protrudes radially inward along the rotating shaft, the first permanent magnet is assembled near the magnetic end cover and is sealed with the outer peripheral plate and the magnetic end cover, and the second permanent magnet is assembled near the annular bottom plate and is sealed with the outer peripheral plate and the annular bottom plate.

[0010] In some embodiments, a magnetic isolation ring is provided on the inner peripheral surface of the outer peripheral plate, and two ends of the magnetic isolation ring are respectively abutted against the first permanent magnet and the second permanent magnet.

[0011] In some embodiments, a first retaining ring is provided on the inner circumference of the shell, and the first retaining ring is clamped between the magnetic shells of adjacent sealing assemblies; and / or a second retaining ring is provided on the inner circumference of the shell, one side of the second retaining ring abuts against the end plate of the shell, and the other side abuts against the magnetic shell close to the end plate of the shell; and / or a third retaining ring is provided on the outer circumference of the sleeve, and the third retaining ring is clamped between the adjacent sealing sleeve and the vibration damping shell.

[0012] In some embodiments, the sleeve is provided with a circumferentially surrounding first retaining spring at its first axial end and a circumferentially surrounding second retaining spring at its second end, the first retaining spring abuts against the outer side of the sealing sleeve near the first end, and the second retaining spring abuts against the outer side of the sealing sleeve near the second end.

[0013] In some embodiments, the magnetic shell is sealed to the shell through a first sealing ring, and an annular groove for accommodating the first sealing ring is provided on the outer circumference of the magnetic shell; and / or, the first permanent magnet is sealed to the magnetic shell through a second sealing ring, and an annular groove for accommodating the second sealing ring is provided on the outer circumference of the first permanent magnet; and / or, the second permanent magnet is sealed to the magnetic shell through a third sealing ring, and an annular groove for accommodating the third sealing ring is provided on the outer circumference of the second permanent magnet.

[0014] In some embodiments, the sealing sleeve is sealed to the shaft sleeve via a fourth sealing ring, and an annular groove for accommodating the fourth sealing ring is provided on the inner circumference of the sealing sleeve; and / or, the shaft sleeve is sealed to the rotating shaft body via a fifth sealing ring, and an annular groove for accommodating the fifth sealing ring is provided on the inner circumference of the shaft sleeve.

[0015] In some embodiments, the shell includes an annular side plate and a bottom plate, the annular side plate and the bottom plate are sealed by a sixth sealing ring, and a seventh sealing ring is provided on the end surface of the annular side plate facing away from the bottom plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 3 is a schematic structural diagram of a magnetic medium sealing device resistant to multi-directional vibration according to an embodiment of the present invention.

[0017] Figure 2 yes Figure 1 A magnified view of the local structure.

[0018] Reference numerals:

[0019] The rotating shaft body 1, the sleeve 2, the shell 3, the peripheral plate 4, the bottom plate 5, the sealing sleeve 6, the cylindrical body 7, the first permanent magnet 8, the second permanent magnet 9, the magnetic shell 10, the outer peripheral plate 11, the magnetic end cover 12, the annular bottom plate 13, the vibration damping shell 14, the third permanent magnet 15, the magnetic isolation ring 16, the first retaining ring 17, the second retaining ring 18, the third retaining ring 19, the first retaining ring 20, the second retaining ring 21, the first sealing ring 22, the second sealing ring 23, the third sealing ring 24, the fourth sealing ring 25, the fifth sealing ring 26, the sixth sealing ring 27, and the seventh sealing ring 28. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0021] like Figure 1 and Figure 2 As shown, the magnetic medium sealing device resistant to multi-directional vibration according to an embodiment of the present invention includes a housing 3, a rotating shaft, a sealing assembly and a vibration reduction assembly.

[0022] Specifically, the shell 3 has a accommodating cavity, the rotating shaft is passed through the shell 3 and the rotating shaft includes a rotating shaft body 1 and a sleeve 2, the sleeve 2 is sealingly sleeved on the rotating shaft body 1, and the sealing assembly includes a sealing sleeve 6, a first permanent magnet 8, a second permanent magnet 9 and a magnetic shell 10. The sealing sleeve 6 surrounds the outer circumference of the sleeve 2 and is sealed with the sleeve 2. The sealing sleeve 6 has a cylindrical portion 7 that protrudes outward along the radial direction of the rotating shaft and extends in a ring shape along the circumference of the rotating shaft. The magnetic shell 10 is sealed and connected to the inner circumferential surface of the shell 3 and is arranged in a ring shape along the circumference of the rotating shaft. The first permanent magnet 8 and the second permanent magnet 9 are arranged at intervals in the axial direction of the rotating shaft and are both sealed and connected to the magnetic shell 10. The cylindrical portion 7 is located between the first permanent magnet 8 and the second permanent magnet 9, and a sealing gap is reserved between the cylindrical portion 7 and the first permanent magnet 8 and the second permanent magnet 9. The upper and lower end faces of the cylindrical portion 7 are provided with pole teeth protruding toward the sealing gap.

[0023] In this embodiment, the magnetic shell 10 and the sealing sleeve 6 are both made of magnetic materials with good magnetic conductivity, and the housing 3 and the sleeve 2 are both made of non-magnetic materials. Figure 1 As shown, the magnetic lines of force from the N pole of the second permanent magnet 9 pass through the sealing sleeve 6 to the S pole of the first permanent magnet 8, and the magnetic lines of force from the N pole of the first permanent magnet 8 pass through the magnetic shell 10 to the S pole of the second permanent magnet 9 to form a closed magnetic line loop.

[0024] Thus, a sealed gap can be formed between the cylindrical portion 7 and the first permanent magnet 8 and the second permanent magnet 9. After the magnetic medium is injected into the gap, a magnetic medium end face seal can be formed under the non-uniform magnetic induction intensity of the permanent magnet. Since the first permanent magnet 8, the cylindrical portion 7 and the second permanent magnet 9 are arranged in the axial direction of the rotating shaft, the sealed gap is perpendicular to the axial direction of the rotating shaft. When the rotating shaft vibrates and deviates in the radial direction, the value of the sealed gap remains unchanged, thereby eliminating the influence of the radial vibration of the rotating shaft on the magnetic sealing effect. It should be noted that the magnetic medium includes but is not limited to magnetic particles, magnetic liquid, magnetorheological fluid, magnetic grease and other magnetic media.

[0025] Furthermore, the vibration damping assembly includes a vibration damping housing 14 and a third permanent magnet 15. The vibration damping housing 14 surrounds the outer circumference of the rotating shaft and is connected to the sleeve 2. The vibration damping housing 14 is used to accommodate a magnetic medium, and the third permanent magnet 15 is suspended in the magnetic medium within the vibration damping housing 14. It is understandable that when the rotating shaft vibrates in the axial, radial, or other directions, the permanent magnets in the chamber oscillate in the magnetic medium, shearing and rubbing the magnetic medium to generate heat and dissipate vibration energy, thereby effectively reducing vibration. That is, the vibration assembly can effectively reduce vibration in any direction. It should be noted that in this application, the vibration damping housing 14 is made of non-magnetic conductive material. It should be noted that the magnetic medium within the vibration damping housing 14 includes, but is not limited to, magnetic liquid, magnetorheological fluid, magnetorheological plastic, magnetorheological elastomer, and the like. The specific material can be selected based on the actual operating vibration frequency.

[0026] The embodiment of the present invention is a magnetic medium sealing device resistant to multi-directional vibration. The sealing assembly includes a sealing sleeve 6, a first permanent magnet 8, a second permanent magnet 9 and a magnetic shell 10. The sealing sleeve 6 surrounds the outer periphery of the sleeve 2 and is sealed with the sleeve 2. The sealing sleeve 6 has a cylindrical portion 7 that protrudes outward along the radial direction of the rotating shaft and extends in a ring shape along the circumference of the rotating shaft. The magnetic shell 10 is sealed with the inner circumferential surface of the shell 3. The first permanent magnet 8 and the second permanent magnet 9 are arranged at intervals in the axial direction of the rotating shaft and are both sealed with the magnetic shell 10. The cylindrical portion 7 is located between the first permanent magnet 8 and the second permanent magnet 9, and a sealing gap is reserved between the cylindrical portion 7 and the first permanent magnet 8 and the second permanent magnet 9. The upper and lower end surfaces of the cylindrical portion 7 are provided with pole teeth protruding toward the sealing gap. The vibration reduction assembly The utility model comprises a vibration-damping shell 14 and a third permanent magnet 15. The vibration-damping shell 14 surrounds the outer circumference of the rotating shaft and is connected to the sleeve 2. The vibration-damping shell 14 is used to accommodate the magnetic medium. The third permanent magnet 15 is suspended in the magnetic medium in the vibration-damping shell 14. Therefore, the sealing gap formed by the cylindrical portion 7 and the first permanent magnet 8 and the second permanent magnet 9 is perpendicular to the axial direction of the rotating shaft. The sealing performance is not affected by the radial vibration of the rotating shaft, which can effectively improve the reliability of the sealing device. At the same time, when the rotating shaft vibrates in the axial, radial or other directions, the permanent magnet in the vibration-damping assembly oscillates in the magnetic medium, which can adaptively dissipate the energy of the vibration of the rotating shaft in all directions, effectively reduce the vibration, effectively avoid the component interference problem caused by the vibration of the rotating shaft in all directions, and improve the reliability of the sealing device.

[0027] In some embodiments, multiple sets of sealing assemblies are arranged axially at intervals along the rotating shaft, and / or multiple sets of vibration damping assemblies are arranged axially at intervals along the rotating shaft. It will be appreciated that multiple sets of sealing assemblies can form a multi-stage seal, further improving sealing reliability, and multiple sets of vibration damping assemblies can increase the ability to dissipate vibration energy and enhance the vibration damping effect.

[0028] like Figure 1 As shown, the sealing components include two groups, and the gas leakage path must flow through the two groups of sealing components in sequence, which greatly reduces the risk of leakage.

[0029] Preferably, the multiple groups of sealing assemblies and the multiple groups of vibration damping assemblies are alternately arranged in the axial direction of the rotating shaft.

[0030] In some embodiments, the magnetic shell 10 includes a magnetic body and a magnetic end cap 12. The magnetic body includes an outer peripheral plate 11 that is sealed against the inner peripheral surface of the shell 3 and an annular bottom plate 13 connected to one end of the outer peripheral plate 11 and protruding radially inward along the rotating shaft. The magnetic end cap 12 is connected to the other end of the outer peripheral plate 11 and protrudes radially inward along the rotating shaft. The first permanent magnet 8 is assembled near the magnetic end cap 12 and is sealed with both the outer peripheral plate 11 and the magnetic end cap 12. The second permanent magnet 9 is assembled near the annular bottom plate 13 and is sealed with both the outer peripheral plate 11 and the annular bottom plate 13. Thus, the magnetic shell 10 is an annular structure with a groove that is open toward the rotating shaft. After the first permanent magnet 8 and the second permanent magnet 9 are assembled, the annular bottom plate 13 and the magnetic end cap 12 can provide a support surface for the permanent magnets, making the assembly of the permanent magnets more stable.

[0031] Specifically, if Figure 1 As shown, after the first permanent magnet 8 is assembled, its outer peripheral surface is sealed and fitted with the outer peripheral plate 11, and its upper end surface is sealed and fitted with the magnetic end cover 12; after the second permanent magnet 9 is assembled, its outer peripheral surface is sealed and fitted with the outer peripheral plate 11, and its lower end surface is sealed and fitted with the annular bottom plate 13, that is, each permanent magnet has two mounting support surfaces, and the assembly reliability and stability are better.

[0032] Furthermore, if Figure 1 and Figure 2 As shown, a magnetic isolation ring 16 is provided on the inner circumference of the outer plate 11, and the two ends of the magnetic isolation ring 16 respectively abut against the first permanent magnet 8 and the second permanent magnet 9. It can be understood that the magnetic isolation ring 16 clamped between the first permanent magnet 8 and the second permanent magnet 9 can play a role in limiting and positioning the assembly of the permanent magnets.

[0033] Further, if Figure 1 As shown, a first retaining ring 17 is provided on the inner circumference of the housing 3. The first retaining ring 17 is clamped between the magnetically conductive shells 10 of adjacent sealing assemblies. Thus, the first retaining ring 17 can limit the assembly of the magnetically conductive shells 10 and ensure the structural stability after assembly.

[0034] And / or a second retaining ring 18 is provided on the inner circumference of the housing 3, one side of the second retaining ring 18 abuts against the end plate of the housing 3, and the other side abuts against the magnetic conductive shell 10 near the end plate of the housing 3. It is understood that the second retaining ring 18 can abut against the magnetic conductive shell 10 at the end to achieve outer limit.

[0035] And / or, a third retaining ring 19 is provided on the outer circumferential surface of the shaft sleeve 2, and the third retaining ring 19 is clamped between the adjacent sealing sleeve 6 and the vibration damping housing 14. Thus, the third retaining ring 19 can limit the assembly position of the vibration damping housing 14 and the sealing sleeve 6, avoid assembly misalignment, and ensure structural stability after assembly.

[0036] In some embodiments, as Figure 1 As shown, the shaft sleeve 2 is provided with a circumferentially surrounding first retaining spring 20 at its first axial end and a circumferentially surrounding second retaining spring 21 at its second end. The first retaining spring 20 abuts against the outer side of the sealing sleeve 6 near the first end, while the second retaining spring 21 abuts against the outer side of the sealing sleeve 6 near the second end. In other words, retaining springs are provided at each end of the shaft sleeve 2 to axially limit the assembly of the sealing sleeve 6.

[0037] In some embodiments, as Figure 1 As shown, the magnetic shell 10 is sealed to the housing 3 via a first sealing ring 22. An annular groove for accommodating the first sealing ring 22 is provided on the outer circumference of the magnetic shell 10. In other words, the first sealing ring 22 can be first inserted into the annular groove on the magnetic shell 10, and then the entire shell 10 is sealed to the housing 3.

[0038] Optionally, the first permanent magnet 8 and the magnetically conductive housing 10 are sealed together via a second sealing ring 23, and the outer circumferential surface of the first permanent magnet 8 includes an annular groove for accommodating the second sealing ring 23. That is, the second sealing ring 23 can first be inserted into the annular groove on the first permanent magnet 8 and then be integrally and sealedly mounted to the magnetically conductive housing 10.

[0039] Optionally, the second permanent magnet 9 and the magnetically conductive housing 10 are sealed together via a third sealing ring 24, and an annular groove for accommodating the third sealing ring 24 is provided on the outer circumference of the second permanent magnet 9. That is, the third sealing ring 24 can first be inserted into the annular groove on the second permanent magnet 9 and then be integrally and sealedly mounted to the magnetically conductive housing 10.

[0040] Furthermore, if Figure 1 As shown, the sealing sleeve 6 is sealed to the shaft sleeve 2 via the fourth sealing ring 25 , and an annular groove for accommodating the fourth sealing ring 25 is provided on the inner circumference of the sealing sleeve 6 .

[0041] Optionally, the shaft sleeve 2 is sealed to the shaft body 1 via a fifth sealing ring 26 , and an annular groove for accommodating the fifth sealing ring 26 is provided on the inner circumferential surface of the shaft sleeve 2 .

[0042] It should be noted that the above-mentioned retaining ring and sealing ring are both made of non-magnetic materials.

[0043] In some embodiments, the shell 3 includes an annular side plate and a bottom plate 5, and the annular side plate and the bottom plate 5 are sealed by a sixth sealing ring 27. A seventh sealing ring 28 is provided on the end surface of the annular side plate facing away from the bottom plate 5 for sealing connection with external equipment.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0046] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0047] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0048] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0049] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A magnetic medium sealing device resistant to multi-directional vibration, characterized in that: include: A housing and a rotating shaft, wherein the housing has an accommodating cavity, the rotating shaft is passed through the housing and comprises a rotating shaft body and a shaft sleeve, and the shaft sleeve sealing sleeve is provided on the rotating shaft body; A sealing assembly, the sealing assembly comprising a sealing sleeve, a first permanent magnet, a second permanent magnet and a magnetic conductive shell, the sealing sleeve surrounding the outer circumference of the shaft sleeve and being sealedly connected to the shaft sleeve, the sealing sleeve having a cylindrical portion protruding radially outwardly along the rotating shaft and extending in an annular manner along the circumference of the rotating shaft, the magnetic conductive shell being sealedly connected to the inner circumferential surface of the shell and annularly arranged along the circumference of the rotating shaft, the first permanent magnet and the second permanent magnet being spaced apart in the axial direction of the rotating shaft and both being sealedly connected to the magnetic conductive shell, the cylindrical portion being located between the first permanent magnet and the second permanent magnet, and a sealing gap being reserved between the cylindrical portion and the first permanent magnet and the second permanent magnet, and pole teeth protruding toward the sealing gap being provided on the upper and lower end surfaces of the cylindrical portion; The vibration damping assembly includes a vibration damping shell and a third permanent magnet. The vibration damping shell surrounds the outer circumference of the rotating shaft and is connected to the sleeve. The vibration damping shell is used to accommodate magnetic medium. The third permanent magnet is suspended in the magnetic medium in the vibration damping shell.

2. The magnetic medium sealing device resistant to multi-directional vibration according to claim 1, characterized in that: The sealing components are arranged in a plurality of groups at intervals along the axial direction of the rotating shaft, and / or the vibration reduction components are arranged in a plurality of groups at intervals along the axial direction of the rotating shaft.

3. The magnetic medium sealing device resistant to multi-directional vibration according to claim 2, characterized in that: A plurality of groups of the sealing components and a plurality of groups of the vibration damping components are alternately arranged in the axial direction of the rotating shaft.

4. The magnetic medium sealing device resistant to multi-directional vibration according to claim 2, characterized in that: The magnetic shell includes a magnetic body and a magnetic end cover. The magnetic body includes an outer peripheral plate sealed with the inner peripheral surface of the shell and an annular bottom plate connected to one end of the outer peripheral plate and protruding radially inward along the rotating shaft. The magnetic end cover is connected to the other end of the outer peripheral plate and protrudes radially inward along the rotating shaft. The first permanent magnet is assembled near the magnetic end cover and is sealed with the outer peripheral plate and the magnetic end cover. The second permanent magnet is assembled near the annular bottom plate and is sealed with the outer peripheral plate and the annular bottom plate.

5. The magnetic medium sealing device resistant to multi-directional vibration according to claim 4, characterized in that: A magnetic isolation ring is provided on the inner peripheral surface of the outer peripheral plate, and two ends of the magnetic isolation ring are respectively abutted against the first permanent magnet and the second permanent magnet.

6. The magnetic medium sealing device resistant to multi-directional vibration according to claim 4, characterized in that: A first retaining ring is provided on the inner circumference of the shell, and the first retaining ring is clamped between the magnetic shells of adjacent sealing assemblies; and / or a second retaining ring is provided on the inner circumference of the shell, one side of the second retaining ring abuts against the end plate of the shell, and the other side abuts against the magnetic shell close to the end plate of the shell; and / or a third retaining ring is provided on the outer circumference of the sleeve, and the third retaining ring is clamped between the adjacent sealing sleeve and the vibration damping shell.

7. The magnetic medium sealing device resistant to multi-directional vibration according to claim 6, characterized in that: The sleeve is provided with a circumferentially surrounding first retaining spring at its first axial end and a circumferentially surrounding second retaining spring at its second end. The first retaining spring abuts against the outer side of the sealing sleeve near the first end, and the second retaining spring abuts against the outer side of the sealing sleeve near the second end.

8. The magnetic medium sealing device resistant to multi-directional vibration according to claim 1, characterized in that: The magnetic shell is sealed to the shell by a first sealing ring, and an annular groove for accommodating the first sealing ring is provided on the outer circumferential surface of the magnetic shell; and / or the first permanent magnet is sealed to the magnetic shell by a second sealing ring, and an annular groove for accommodating the second sealing ring is provided on the outer circumferential surface of the first permanent magnet; and / or the second permanent magnet is sealed to the magnetic shell by a third sealing ring, and an annular groove for accommodating the third sealing ring is provided on the outer circumferential surface of the second permanent magnet.

9. The magnetic medium sealing device resistant to multi-directional vibration according to claim 1, characterized in that: The sealing sleeve is sealed to the shaft sleeve via a fourth sealing ring, and an annular groove for accommodating the fourth sealing ring is provided on the inner circumference of the sealing sleeve; and / or the shaft sleeve is sealed to the rotating shaft body via a fifth sealing ring, and an annular groove for accommodating the fifth sealing ring is provided on the inner circumference of the shaft sleeve.

10. The magnetic medium sealing device resistant to multi-directional vibration according to claim 1, characterized in that: The housing includes an annular side plate and a bottom plate. The annular side plate and the bottom plate are sealed via a sixth sealing ring. A seventh sealing ring is provided on the end surface of the annular side plate facing away from the bottom plate.

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