Self-repairing magnetofluid dynamic sealing device

Abstract

The invention discloses a self-repairing magnetofluid dynamic sealing device, and relates to the field of magnetofluid sealing structures, the self-repairing magnetofluid dynamic sealing device comprises a shell, a rotating shaft, a plurality of stator pole shoes, a plurality of rotor pole shoes and magnetofluid, and a plurality of series-connected sealing gaps for containing the magnetofluid exist between the stator pole shoes and the rotor pole shoes; the magnetofluid can form multiple layers of magnetofluid liquid films which are connected in series in the multiple sealing gaps; the rotor also comprises at least one oil retainer, and a single rotor pole shoe is provided with an arc-shaped annular groove a which is expanded inwards in an inclined manner. An arc-shaped annular groove b which is outwards and obliquely expanded is formed in an inner hole of the single oil retainer; an inner hole of each stator pole shoe is provided with an annular step, and the stator pole shoes, the oil retaining rings and the rotor pole shoes jointly form an arc-shaped flow channel in the sealing gap. The stator pole shoe, the oil retainer and the rotor pole shoe are arranged to jointly form the arc-shaped flow channel in the sealing gap, so that the purposes of reducing the movement speed of leaked sealing media and magnetic fluid and reducing impact on a lower-stage seal are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of magnetic fluid sealing structure, and particularly relates to a self-repairing magnetic fluid dynamic sealing device. BACKGROUND

[0002] The magnetic fluid dynamic sealing device uses magnetic field to confine the magnetic fluid in the gap between the relative motion joint surfaces, so as to hinder the leakage of the sealing medium, and is widely used in the fields of semiconductor, aerospace, national defense, chemical industry, petroleum, instrument and meter, etc.

[0003] Due to the limited limit pressure bearing capacity of the single-layer magnetic fluid liquid film, multiple layers of magnetic fluid liquid films are connected in series in engineering to share the sealing pressure, so as to improve the cumulative pressure bearing capacity. When the multiple-layer magnetic fluid sealing works, with the increase of the sealing pressure, the magnetic fluid liquid film transmits the sealing pressure to the next stage by rupturing layer by layer and releasing part of the sealing medium. After the magnetic fluid liquid film ruptures, the high-speed flowing sealing medium will drive part of the magnetic fluid to move to the next layer of magnetic fluid liquid film. With the transfer of the sealing medium, the pressure difference between the two sides of the liquid film gradually decreases to the pressure bearing capacity range of the magnetic fluid liquid film, and part of the magnetic fluid returns to the upper sealing interface under the action of the strong magnetic field and re-forms a complete liquid film and restores part of the pressure bearing capacity, that is, the magnetic fluid liquid film completes self-repairing.

[0004] The traditional multi-stage magnetic fluid sealing device often uses a sealing channel penetrating front and back. Under the conditions of high speed and large gap sealing, the stability of the high-speed moving magnetic fluid liquid film is significantly reduced. When the magnetic fluid liquid film of the current stage ruptures, a large amount of magnetic fluid is transferred from the high-pressure side to the low-pressure side under the driving of the high-speed airflow, directly enters the magnetic force influencing range of the next stage sealing in the penetrating sealing channel, is attracted by the next layer of magnetic pole shoe and merges into the next layer of magnetic fluid liquid film, and further transfers to the next layer of magnetic fluid liquid film with the rupture of the next layer of magnetic fluid liquid film. The high-speed airflow generated when the magnetic fluid liquid film ruptures will also directly impact the next layer of magnetic fluid liquid film when moving in the penetrating sealing channel, increasing the risk of rupture of the next layer of magnetic fluid liquid film, and further aggravating the risk of magnetic liquid loss. The penetrating sealing channel from front to back causes most of the magnetic fluid to directly flow away, which cannot return to the upper sealing interface, resulting in a significant reduction of the magnetic fluid filled in the sealing gap, and the self-repairing of the magnetic fluid liquid film is very limited, which cannot meet the long-life working requirements of the high-speed and large-gap magnetic fluid sealing.

[0005] Therefore, the present application is proposed. SUMMARY

[0006] The purpose of the present invention is to provide a self-repairing magnetohydrodynamic sealing device, which forms an arc-shaped flow channel in the sealing gap by arranging stator pole shoes, oil retaining rings and rotor pole shoes to solve the problem in the prior art that the high-speed airflow generated when the upper-level magnetofluid liquid film ruptures will directly impact the next layer of magnetofluid liquid film when moving in the front-to-back sealing channel, thereby increasing the risk of rupture of the next layer of magnetofluid liquid film.

[0007] The embodiment of the present invention is achieved through the following technical solution: providing a self-repairing magnetic fluid dynamic sealing device, including: a housing to protect and support internal components; The rotating shaft is arranged through the shell and can rotate relative to the shell; A plurality of stator pole shoes are arranged inside the housing; A plurality of rotor pole shoes are arranged on the rotating shaft and can rotate with the rotating shaft and form relative rotation with the stator pole shoes; Magnetic fluid, multiple sealed gaps in series are provided between the multiple stator pole shoes and the multiple rotor pole shoes to accommodate the magnetic fluid. The magnetic fluid can form multiple layers of magnetic fluid liquid films in series in the multiple sealed gaps, and each layer of liquid film forms a seal under the action of the magnetic field generated by the permanent magnet; At least one oil deflector ring is disposed in a central annular groove of at least one stator pole shoe; A single rotor pole shoe is provided with an arc-shaped annular groove a extending obliquely inward and an annular protrusion extending obliquely outward; The inner hole of a single oil deflector ring is provided with an arc-shaped annular groove b extending obliquely outward and an annular protrusion extending obliquely inward; An annular step is provided on the inner hole of a single stator pole shoe; The oil retaining ring, the rotor pole shoe and the stator pole shoe jointly form an arc-shaped flow channel in the sealing gap.

[0008] Optionally, the inner hole of the stator pole shoe is a conical structure extending outward, and the annular step is provided on the conical structure; The inner hole of the oil retaining ring is a conical surface structure, and the arc-shaped annular groove a includes a semicircular arc annular groove a; The outer circle of the rotor pole shoe is a conical surface structure, and the arc-shaped annular groove b includes a semi-circular arc annular groove b.

[0009] The Tesla one-way valve principle is adopted in the embodiment of the application, and through the construction of the arc-shaped flow channel, when the front-stage magnetic fluid leaks, the arc-shaped flow channel formed by the semicircular arc ring-shaped groove guides the reverse backflow of the sealing medium and the magnetic fluid, collides with the sealing medium and the magnetic fluid flowing into the semicircular arc ring-shaped groove subsequently, significantly increases the flow resistance and reduces the flow speed, so that the lost magnetic fluid is stored in the semicircular arc ring-shaped groove, and the alternately arranged arc-shaped flow channels further guide the reverse flow of the sealing medium and the magnetic fluid again, increase the flow resistance and reduce the flow speed, and prevent the magnetic liquid film from being lost in large quantities due to the chain failure of the magnetic liquid film. Alternatively, the arc-shaped flow channel is an alternately reversed branch flow channel, the branch flow channel is used for collecting and guiding the leaked magnetic fluid, and the magnetic fluid can be guided back to the front-stage sealing gap.

[0010] Specifically, when the previous layer of magnetic fluid liquid film is broken, the leaked magnetic fluid is driven by the external high-speed flowing medium, flows to the semicircular arc ring-shaped groove b on the oil retaining ring, and the sealing medium and the magnetic fluid flowing into the semicircular arc ring-shaped groove first revolve under the guidance of the semicircular arc ring-shaped groove, intersect with the sealing medium and the magnetic fluid flowing into the semicircular arc ring-shaped groove subsequently, the semicircular arc ring-shaped groove on the oil retaining ring guides the reverse flow of the sealing medium and the magnetic fluid back to the front-stage sealing gap, slows down the speed of the magnetic fluid loss, and stores the magnetic fluid in the semicircular arc ring-shaped groove; At the same time, a small amount of magnetic fluid continues to flow along the gap between the oil retaining ring and the rotor pole shoe, is guided in the reverse direction by the groove on the rotor pole shoe, and hinders the loss of the magnetic fluid.

[0011] Alternatively, the distance between the semicircular arc ring-shaped groove on the oil retaining ring and the front-stage stator pole shoe is smaller than the distance between the semicircular arc ring-shaped groove and the next-stage stator pole shoe.

[0012] The semicircular arc ring-shaped groove is closer to the front-stage sealing gap, guides the magnetic fluid stored in the semicircular arc ring-shaped groove to return to the upper-stage sealing gap, and achieves the self-repairing effect.

[0013] Alternatively, the center ring groove of each stator pole shoe is provided with an oil retaining ring.

[0014] Alternatively, the stator pole shoe and the rotor pole shoe are made of magnetic conductive material, and the oil retaining ring is made of non-magnetic conductive material.

[0015] Alternatively, a magnetic conductive sleeve is further installed on the rotating shaft, and the magnetic conductive sleeve is used for guiding the magnetic field generated by the permanent magnet, so that the magnetic field is more concentratedly distributed between the stator pole shoe and the rotor pole shoe.

[0016] Alternatively, a nut is arranged on the rotating shaft, and the nut is used for fixing the positions of the rotor pole shoe and the magnetic conductive sleeve on the rotating shaft.

[0017] Alternatively, a bearing seat is further installed on the rotating shaft, a rolling bearing is installed on the bearing seat, and the rolling bearing is used for reducing friction and supporting the rotation of the rotating shaft.

[0018] Optionally, the shell is cylindrical, and the rotating shaft is cylindrical.

[0019] Compared with the prior art, the embodiment of the present application has the following advantages and beneficial effects: 1. The self-repairing magnetic fluid dynamic sealing device provided by the embodiment of the present application utilizes the magnetic field generated by the permanent magnet to form a plurality of series sealing gaps between the plurality of stator pole shoes and the plurality of rotor pole shoes, so that the magnetic fluid forms a plurality of layers of series magnetic fluid liquid films, each layer of the magnetic fluid liquid film can form a stable seal under the action of the magnetic field, effectively preventing fluid leakage. When one layer of the magnetic fluid liquid film is broken due to pressure or other factors, the leaked magnetic fluid can be collected by the adjacent oil retaining ring, and the arc-shaped flow channel formed by the oil retaining ring, the stator pole shoe and the rotor pole shoe can guide the magnetic fluid back to the previous stage sealing gap, so as to realize the redistribution of the magnetic fluid and the self-repairing of the liquid film, thereby reducing the maintenance requirement and downtime.

[0020] 2. In the embodiment of the present application, branch flow channels in alternating directions are formed in the sealing gap. In the working process of the self-repairing magnetic fluid dynamic sealing device, the magnetic fluid is located between the rotor pole shoe and the stator pole shoe to form a sealing gap. When the first layer of the magnetic fluid liquid film is broken, the external high-speed inflowing sealing medium can drive part of the magnetic fluid to flow along the semi-circular arc annular groove b on the oil retaining ring, and the sealing medium and the magnetic fluid flowing into the semi-circular arc annular groove first flow in a circular manner under the guidance of the semi-annular groove, and then meet the sealing medium and the magnetic fluid flowing into the semi-circular arc annular groove subsequently. This structure can hinder the flow of the subsequent medium, significantly reduce the speed of the leaked medium and the magnetic fluid, and enable most of the leaked magnetic fluid to be stored in the semi-circular arc annular groove b of the oil retaining ring.

[0021] Meanwhile, a small amount of leaked sealing medium can flow along the sealing gap formed between the oil retaining ring and the rotor pole shoe to the semi-circular arc annular groove a on the rotor pole shoe, and these media flow reversely back to the sealing gap between the oil retaining ring and the rotor pole shoe under the guidance of the semi-circular arc annular groove a on the rotor pole shoe, and meet the subsequent inflowing sealing medium, further hindering the flow of the medium, reducing the leakage speed, and reducing the impact on the next layer of the magnetic fluid liquid film. This structure avoids the chain rupture of the magnetic fluid sealing liquid film under the action of high-speed airflow, and prevents a large amount of magnetic liquid from being lost due to continuous rupture.

[0022] 3. In the embodiment of the present application, the semi-circular arc annular groove b on the oil retaining ring is closer to the previous stage stator pole shoe and farther away from the next stage stator pole shoe. When the pressure on both sides of the broken magnetic fluid liquid film decreases, the magnetic fluid stored in the groove of the oil retaining ring can return to the previous stage sealing gap under the action of the magnetic field generated by the previous stage pole shoe, thereby further improving the self-repairing capability.

[0023] Overall, the embodiment of the present application provides a self-repairing magnetic fluid dynamic sealing device, by setting the stator pole shoe, oil retaining ring and rotor pole shoe to form the branch flow channel in the sealing gap, so as to reduce the movement speed of the leakage sealing medium and magnetic fluid, reduce the impact on the lower sealing, prevent the chain reaction caused by a large amount of magnetic liquid loss. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0025] Figure 1 The cross-sectional view of the self-repairing magnetic fluid dynamic sealing device in the embodiment of the present application; Figure 2 The cross-sectional view of the branch flow channel in the embodiment of the present application; Figure 3 The flow direction of the sealing medium and the magnetic fluid in the branch flow channel; Figure 4 The structure diagram of the semicircular arc ring groove in the rotor pole shoe; Figure 5 The structure diagram of the semicircular arc ring groove in the oil retaining ring; Figure 6 The structure diagram of the ring step in the stator pole shoe.

[0026] Markings in the drawings and corresponding names of parts: 1 - housing, 2 - shaft, 3 - bearing seat, 4 - permanent magnet, 5 - stator pole shoe, 6 - oil retaining ring, 7 - rotor pole shoe, 8 - rolling bearing, 9 - magnetic conducting sleeve, 10 - magnetic fluid, 11 - nut, 12 - branch flow channel, 13 - semicircular arc ring groove a, 14 - semicircular arc ring groove b, 15 - ring step. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application claimed, but merely represents selected embodiments of the application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the application without creative labor fall within the scope of the protection of the application.

[0029] It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0030] In the description of the application, it should be noted that the terms "first", "second", "third", etc. are only used for differentiation and cannot be understood as indicating or implying relative importance. Embodiments

[0031] Combined with reference Figure 1 and Figure 2 It is shown that the embodiments of the application provide a self-repairing magnetic fluid dynamic sealing device, which comprises the following components: Housing 1: cylindrical structure, used to protect and support internal components.

[0032] Rotating shaft 2: penetrates through the housing 1, composed of six cylindrical segments, capable of forming relative rotation with the housing 1.

[0033] Rolling bearing 8: installed on the first and sixth cylindrical segments of the rotating shaft 2, used to support the rotating shaft 2 and reduce friction.

[0034] Nut 11: installed on the second cylindrical segment of the rotating shaft 2, used to fix the rotor pole shoe 7, the magnetic guide sleeve 9 and other components that may be installed on this segment, ensuring that they maintain the correct position and stability during rotation.

[0035] Rotor pole shoe 7: installed on the third cylindrical segment of the rotating shaft 2, made of circular ring-shaped magnetic material, with an outwardly expanding conical surface, and a semicircular arc ring-shaped groove a (refer to Figure 4 shown) and an outwardly expanding ring-shaped protrusion.

[0036] Magnetic guide sleeve 9: installed together with the rotor pole shoe 7 on the third cylindrical segment of the rotating shaft 2, used to guide the magnetic field distribution and enhance the magnetic field strength in the sealing gap.

[0037] Stator pole shoe 5: circular ring-shaped magnetic material, with an outwardly expanding conical surface, and a ring-shaped step (refer to Figure 6 shown), installed inside the housing 1.

[0038] Oil retaining ring 6: circular ring-shaped non-magnetic material, inner hole is a tapered surface expanding outward, the tapered surface has a semicircular arc ring-shaped groove b (refer to Figure 5 ) expanding outward and a ring-shaped protrusion expanding inward, installed in the center ring groove of the stator pole shoe 5.

[0039] Refer to Figure 2 and Figure 3 , the stator pole shoe 5, the oil retaining ring 6, and the rotor pole shoe 7 form alternating reverse branch flow channels.

[0040] Permanent magnet 4: installed in the housing 1, used to generate a magnetic field, magnetize the magnetic fluid 10 to form a stable seal.

[0041] Magnetic fluid 10: located in the sealing gap between the rotor pole shoe 7 and the stator pole shoe 5, forms a multi-layer series of magnetic fluid liquid films under the action of the magnetic field generated by the permanent magnet 4.

[0042] In the magnetic fluid seal device, when the magnetic fluid liquid film breaks, the leaked magnetic fluid may be quickly carried away by the high-speed flowing medium, causing the seal to fail. However, the embodiment of the present application forms alternating reverse branch flow channels (refer to Figure 2 and Figure 3 ) on the stator pole shoe 5, the oil retaining ring 6, and the rotor pole shoe 7, which effectively controls the flow of the magnetic fluid. These flow channels not only guide the reverse flow of the magnetic fluid, slowing down its speed, but also help to redirect the magnetic fluid back to the previous sealing gap, thereby achieving self-repair.

[0043] Specifically, in operation, the magnetic fluid 10 is located in the sealing gap between the rotor pole shoe 7 and the stator pole shoe 5. When the first layer of magnetic fluid liquid film breaks, the high-speed sealing medium flowing in from the outside carries a part of the magnetic fluid along the sealing gap direction to the semicircular arc ring-shaped groove b on the oil retaining ring 6, and the sealing medium and magnetic fluid flowing into the semicircular arc ring-shaped groove first flow in a circular manner under the guidance of the semicircular arc ring-shaped groove, intersecting with the sealing medium and magnetic fluid flowing into the semicircular arc ring-shaped groove later, hindering the movement of the subsequent inflow of sealing medium and magnetic fluid, greatly reducing the movement speed of the leaked sealing medium and magnetic fluid, and most of the leaked magnetic fluid is stored in the semicircular arc ring-shaped groove a on the oil retaining ring 6. A small amount of leaked sealing medium flows along the sealing gap formed between the oil retaining ring 6 and the rotor pole shoe 7 and flows to the semicircular arc ring-shaped groove a on the rotor pole shoe 7, which reverses the flow direction under the guidance of the semicircular arc ring-shaped groove a on the rotor pole shoe 7 to the sealing gap formed between the oil retaining ring 6 and the rotor pole shoe 7, and meets the subsequent inflow of sealing medium, hindering the movement of the subsequent inflow of sealing medium, greatly reducing the movement speed of the leaked sealing medium, reducing the impact of the leaked sealing medium on the next layer of magnetic fluid sealing liquid film, and avoiding the continuous rupture of the magnetic fluid sealing liquid film leading to a large amount of magnetic liquid loss.

[0044] Since the semicircular arc ring groove b on the oil retaining ring 6 is closer to the previous stage stator pole shoe 5 and farther from the next stage stator pole shoe 5, when the pressure on both sides of the broken magnetic fluid liquid film decreases, the magnetic fluid stored in the semicircular arc ring groove b on the oil retaining ring 6 can return to the previous stage sealing gap under the action of the magnetic field of the previous stage pole shoe, thereby greatly improving the self-repairing capability.

[0045] Overall, the embodiments of the present application form alternating reverse branch flow channels in the sealing gap through the semicircular arc ring grooves and ring protrusions on the stator pole shoes 5, the oil retaining ring 6, and the rotor pole shoes 7. When the magnetic fluid liquid film breaks during operation, these alternating reverse branch flow channels can immediately guide the sealing medium and the magnetic fluid to move reversely, which reduces the movement speed of the leaked sealing medium and the magnetic fluid, thereby reducing the impact on the next stage sealing. Not only prevents the occurrence of chain reaction, but also avoids the risk of large amount of magnetic liquid loss, which is crucial for maintaining the stability and reliability of the sealing system.

[0046] In addition, the semicircular arc ring groove b on the oil retaining ring 6 is specially designed to store most of the leaked magnetic fluid in a position closer to the previous layer of magnetic fluid liquid film. This ensures that when the pressure on both sides of the broken magnetic fluid liquid film decreases, the lost magnetic fluid can return to its original position smoothly, not only improving the self-repairing capability, but also enhancing the durability and efficiency of the sealing system.

[0047] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application. It should be noted that the structures or components illustrated in the drawings are not necessarily drawn to scale, and the present application omits the description of well-known components and processing techniques and processes to avoid unnecessary limitation of the present application.

Claims

1. A self-repairing magnetic fluid dynamic sealing device, characterized in that: include: A housing (1) for protecting and supporting internal components; A rotating shaft (2) is provided through the housing (1) and is capable of relative rotation with the housing (1); A plurality of stator pole shoes (5) are arranged inside the housing (1); A plurality of rotor pole shoes (7) are arranged on the rotating shaft (2) and are capable of rotating with the rotating shaft (2) and forming relative rotation with the stator pole shoes (5); A magnetic fluid (10), wherein a plurality of sealed gaps in series for accommodating the magnetic fluid (10) exist between the plurality of stator pole shoes (5) and the plurality of rotor pole shoes (7), and the magnetic fluid (10) can form multiple layers of magnetic fluid liquid films in series in the plurality of sealed gaps, and each layer of liquid film forms a seal under the action of the magnetic field generated by the permanent magnet (4); At least one oil deflector ring (6) is arranged in a central annular groove of at least one stator pole shoe (5); A single rotor pole shoe (7) is provided with an arc-shaped annular groove a extending obliquely inwards and an annular protrusion extending obliquely outwards; The inner hole of a single oil retaining ring (6) is provided with an arc-shaped annular groove b extending obliquely outward and an annular protrusion extending obliquely inward; An annular step (15) is provided on the inner hole of a single stator pole shoe (5); The oil retaining ring (6), the rotor pole shoe (7) and the stator pole shoe (5) together form an arc-shaped flow channel in the sealing gap.

2. A self-repairing magnetic fluid dynamic sealing device according to claim 1, characterized in that: The inner hole of the stator pole shoe (5) is a conical structure extending outward, and the annular step (15) is arranged on the conical structure; The outer circle of the rotor pole shoe (7) is a conical surface structure, and the arc-shaped annular groove a includes a semicircular arc annular groove a (13); The inner hole of the oil retaining ring (6) is a conical surface structure, and the arc-shaped annular groove b includes a semicircular arc annular groove b (14).

3. A self-repairing magnetic fluid dynamic sealing device according to claim 2, characterized in that: The arc-shaped flow channel is an alternately reverse branch flow channel (12), and the branch flow channel (12) is used to collect and guide the leaked magnetic fluid (10), and can redirect the magnetic fluid (10) back to the previous stage sealing gap.

4. A self-repairing magnetic fluid dynamic sealing device according to claim 3, characterized in that: The distance between the upper semicircular arc annular groove b (14) of the oil retaining ring (6) and the previous stage stator pole shoe (5) is smaller than the distance between the upper semicircular arc annular groove b (14) and the next stage stator pole shoe (5).

5. The self-repairing magnetic fluid dynamic sealing device according to claim 4, characterized in that: An oil retaining ring (6) is provided in the central annular groove of each stator pole shoe (5).

6. The self-repairing magnetic fluid dynamic sealing device according to claim 1, characterized in that: The stator pole shoe (5) and the rotor pole shoe (7) are both made of magnetic conductive material, and the oil retaining ring (6) is made of non-magnetic conductive material.

7. The self-repairing magnetic fluid dynamic sealing device according to claim 1, characterized in that: A magnetically conductive sleeve (9) is also mounted on the rotating shaft (2), and the magnetically conductive sleeve (9) is used to guide the magnetic field generated by the permanent magnet (4), so that the magnetic field is more concentratedly distributed between the stator pole shoe (5) and the rotor pole shoe (7).

8. The self-repairing magnetic fluid dynamic sealing device according to claim 7, characterized in that: A nut (11) is provided on the rotating shaft (2), and the nut (11) is used to fix the positions of the rotor pole shoe (7) and the magnetic conductive sleeve (9) on the rotating shaft (2).

9. The self-repairing magnetic fluid dynamic sealing device according to claim 1, characterized in that: A bearing seat (3) is also mounted on the rotating shaft (2), and a rolling bearing (8) is mounted on the bearing seat (3). The rolling bearing (8) is used to reduce friction and support the rotation of the rotating shaft (2).

10. The self-repairing magnetic fluid dynamic sealing device according to claim 1, characterized in that: The housing (1) is cylindrical, and the rotating shaft (2) is cylindrical.

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