Axial bearingless split type magnetic liquid sealing device

Abstract

The invention discloses an axial bearingless split type magnetic liquid sealing device which comprises a shell, a rotating shaft and a magnetic liquid sealing assembly, the magnetic liquid sealing assembly comprises a pole shoe unit, a sealing sleeve and a permanent magnet, and the pole shoe unit comprises a first pole shoe and a second pole shoe. The first pole shoe and the second pole shoe are sleeved on the rotating shaft, the sealing sleeve is sleeved on the rotating shaft and is provided with a first end face and a second end face, and sealing gaps are defined between the first end face and the first pole shoe and between the second end face and the second pole shoe. The liquid sealing device adopts an axial bearingless design, eliminates the structural complexity and cost of a traditional bearing, is beneficial to miniaturization and light weight of the device, can effectively improve the sealing performance and reduce leakage, is suitable for extreme working conditions such as a strong magnetic field, high vacuum, high temperature or low temperature and the like, has relatively strong environment adaptability, simplifies the structure and reduces the cost. And the failure rate and the maintenance cost of the device are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic liquid sealing, and in particular to an axial bearingless split-flap magnetic liquid sealing device. Background Art

[0002] As modern industry places increasing demands on the performance of rotating machinery, traditional contact mechanical seals face technical challenges such as wear, heat and leakage under high-speed conditions. To meet these challenges, non-contact sealing technology, especially magnetic liquid sealing technology, has received widespread attention due to its low friction, low power consumption, long life and strong adaptability. However, existing magnetic liquid sealing devices mostly rely on bearings to support the rotating shaft, which not only increases the structural complexity and cost, but also limits the miniaturization and lightweight of the device. At the same time, the heating and lubrication problems of the bearings at high speeds also affect the reliability of the sealing system. Especially under extreme conditions, such as strong magnetic fields, high vacuum, high temperature or low temperature environments, the applicability of traditional bearings is limited. 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 an axial bearingless split-flap magnetic liquid sealing device.

[0005] The axial bearingless split-flap magnetic liquid sealing device of the embodiment of the present invention comprises a housing, a rotating shaft and a magnetic liquid sealing assembly, wherein the housing defines a chamber; at least a portion of the rotating shaft is rotatably disposed in the chamber; the magnetic liquid sealing assembly is disposed in the chamber, and the magnetic liquid sealing assembly comprises a pole shoe unit, a sealing sleeve and a permanent magnet, wherein the pole shoe unit comprises a first pole shoe and a second pole shoe, each of the first pole shoe and the second pole shoe is sleeved on the rotating shaft and spaced apart in the axial direction of the rotating shaft, the sealing sleeve is sleeved on the rotating shaft, one of the pole shoe unit and the sealing sleeve is connected to the housing, and the other of the pole shoe unit and the sealing sleeve is connected to the rotating shaft, the permanent magnet is disposed between the first pole shoe and the second pole shoe, the sealing sleeve has a first end face and a second end face opposite to each other in the axial direction of the rotating shaft, the first end face and the second end face are located between the first pole shoe and the second pole shoe in the axial direction of the rotating shaft, a sealing gap is defined between the first end face and the first pole shoe, and between the second end face and the second pole shoe, and the sealing gap is used to fill the magnetic liquid.

[0006] In some embodiments, the first pole shoe has a third end face and a fourth end face opposite to each other along the axial direction of the rotating shaft, the third end face is arranged adjacent to the second pole shoe, the third end face is provided with a first pole tooth, and the sealing gap is formed between the first pole tooth and the first end face; and / or the second pole shoe has a fifth end face and a sixth end face opposite to each other along the axial direction of the rotating shaft, the fifth end face is arranged adjacent to the first pole shoe, the fifth end face is provided with a second pole tooth, and the sealing gap is formed between the second pole tooth and the second end face.

[0007] In some embodiments, there are multiple first polar teeth, and the multiple first polar teeth are arranged at intervals in the radial direction of the rotating shaft; and / or there are multiple second polar teeth, and the multiple second polar teeth are arranged at intervals in the radial direction of the rotating shaft.

[0008] In some embodiments, a first groove is formed on the third end surface, and the first pole tooth is located in the first groove; and / or a second groove is formed on the fifth end surface, and the second pole tooth is located in the second groove.

[0009] In some embodiments, the cross-sectional area of ​​the first pole tooth gradually decreases along the direction from the third end face to the first end face; and / or the cross-sectional area of ​​the second pole tooth gradually decreases along the direction from the fifth end face to the second end face.

[0010] In some embodiments, the sealing sleeve is sleeved on the rotating shaft, the pole shoe unit is connected to the shell and is located on the outside of the sealing sleeve, a first sealing groove is opened on the outer circumference of the first pole shoe, a first sealing ring is arranged in the first sealing groove and the outer circumference of the first sealing ring is fitted with the inner circumference of the shell, a second sealing groove is opened on the outer circumference of the second pole shoe, a second sealing ring is arranged in the second sealing groove and the outer circumference of the second sealing ring is fitted with the inner circumference of the shell, a third sealing groove is opened on the inner circumference of the sealing sleeve, a third sealing ring is arranged in the third sealing groove and the outer circumference of the third sealing ring is fitted with the outer circumference of the rotating shaft.

[0011] In some embodiments, the pole shoe unit is connected to the rotating shaft, the sealing sleeve is sleeved on the rotating shaft and located on the outside of the pole shoe unit, the sealing sleeve is connected to the shell, a first sealing groove is opened on the inner circumference of the first pole shoe, a first sealing ring is arranged in the first sealing groove and the inner circumference of the first sealing ring is fitted with the outer circumference of the rotating shaft, a second sealing groove is opened on the inner circumference of the second pole shoe, a second sealing ring is arranged in the second sealing groove and the inner circumference of the second sealing ring is fitted with the outer circumference of the rotating shaft, a third sealing groove is opened on the outer circumference of the sealing sleeve, a third sealing ring is arranged in the third sealing groove and the outer circumference of the third sealing ring is fitted with the inner circumference of the shell.

[0012] In some embodiments, the magnetic liquid sealing assembly has multiple components, and the multiple magnetic liquid sealing components are arranged at intervals along the axial direction of the rotating shaft. A first spacer is provided between two adjacent pole shoe units, and the first spacer is sleeved on the rotating shaft and its two ends are respectively stopped on the two adjacent pole shoe units. A second spacer is provided between two adjacent sealing sleeves, and the second spacer is sleeved on the rotating shaft and its two ends are respectively stopped on the two adjacent sealing sleeves.

[0013] In some embodiments, the shell includes a plurality of petal shells, and any two adjacent petal shells are detachably connected to each other, and the plurality of petal shells define the chamber.

[0014] In some embodiments, a seal is provided between the joint surfaces of two adjacent petal shells.

[0015] The axial bearingless split-flap magnetic liquid sealing device of the embodiment of the present invention adopts an axial bearingless design, which eliminates the structural complexity and cost of traditional bearings, and helps to achieve miniaturization and lightweight of the device. Magnetic liquid sealing technology has the characteristics of low friction, low power consumption, long life and strong adaptability, and can effectively improve sealing performance and reduce leakage. The present invention is suitable for extreme working conditions such as strong magnetic fields, high vacuum, high or low temperatures, and has strong environmental adaptability. The present invention simplifies the structure and reduces the failure rate and maintenance cost of the device. Under high-speed rotation conditions, the present invention can effectively solve the problems of bearing heating and lubrication, and improve the reliability of the sealing system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a schematic structural diagram of an axial bearingless split-flap magnetic liquid sealing device according to an embodiment of the present invention.

[0017] Figure 2 It is a structural schematic diagram of an axial bearingless split-flap magnetic liquid sealing device according to another embodiment of the present invention.

[0018] Reference numerals:

[0019] 100. Axial bearingless split-flap magnetic liquid sealing device; 1. Shell; 101. Chamber; 2. Rotating shaft; 3. Pole shoe unit; 301. First pole shoe; 3011. Third end face; 30111. First groove; 3012. Fourth end face; 3013. First sealing groove; 302. Second pole shoe; 3021. Fifth end face; 3022. Sixth end face; 30221. Second groove; 3023. Second sealing groove; 303. First pole tooth; 304. Second pole tooth; 4. Sealing sleeve; 401. First end face; 402. Second end face; 403. Third sealing groove; 5. Permanent magnet; 6. First sealing ring; 7. Second sealing ring; 8. Third sealing ring; 9. First spacer; 10. Second spacer. DETAILED DESCRIPTION

[0020] 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] The axial bearingless split-flap magnetic liquid sealing device 100 of the embodiment of the present invention comprises a housing 1, a rotating shaft 2 and a magnetic liquid sealing assembly. The housing 1 defines a chamber 101, and at least a portion of the rotating shaft 2 is rotatably disposed in the chamber 101.

[0022] The magnetic liquid sealing assembly is arranged in the chamber 101, and the magnetic liquid sealing assembly includes a pole shoe unit 3, a sealing sleeve 4 and a permanent magnet 5. The pole shoe unit 3 includes a first pole shoe 301 and a second pole shoe 302, each of which is sleeved on the rotating shaft 2 and arranged at intervals in the axial direction of the rotating shaft 2, and the sealing sleeve 4 is sleeved on the rotating shaft 2. One of the pole shoe unit 3 and the sealing sleeve 4 is connected to the housing 1, and the other of the pole shoe unit 3 and the sealing sleeve 4 is connected to the rotating shaft 2, and the permanent magnet 5 is arranged between the first pole shoe 301 and the second pole shoe 302.

[0023] The sealing sleeve 4 has a first end face 401 and a second end face 402 which are opposite to each other in the axial direction of the rotating shaft 2. The first end face 401 and the second end face 402 are located between the first pole shoe 301 and the second pole shoe 302 in the axial direction of the rotating shaft 2. A sealing gap is defined between the first end face 401 and the first pole shoe 301, and between the second end face 402 and the second pole shoe 302. The sealing gap is used to fill the magnetic liquid.

[0024] When the bearingless split-flap magnetic liquid sealing device 100 of the embodiment of the present invention is in use, a magnetic circuit is formed between the first pole shoe 301 and the second pole shoe 302 in the magnetic pole unit, the permanent magnet 5 and the sealing sleeve 4. Under the action of the external magnetic field, a certain amount of magnetic liquid is magnetically attracted in the sealing gap between the first pole shoe 301 and the first end face 401, and a certain amount of magnetic liquid is magnetically attracted in the sealing gap between the second pole shoe 302 and the second end face 402, forming a liquid sealing ring. When the rotating shaft 2 rotates, the magnetic liquid in the sealing gap moves with the rotating shaft 2, thereby realizing efficient dynamic sealing at high speed and effectively preventing medium leakage.

[0025] Since the sealing gap realizes magnetic sealing of the rotating shaft 2 in the radial direction, no additional bearing is required to support the rotating shaft 2 in the magnetic liquid sealing device 100. When the rotating shaft 2 is running at a high speed, the radial magnetic liquid sealing device 100 with a bearingless design can adapt to the radial runout of the rotating shaft 2, thereby improving the reliability of the sealing system. Therefore, the stable operation of the rotating shaft 2 can be guaranteed without the need for additional bearing support, and the sealing effect of the rotating shaft 2 during the rotation process can be achieved.

[0026] Therefore, the axial bearingless split-flap magnetic liquid sealing device 100 of the embodiment of the present invention adopts an axial bearingless design, which eliminates the structural complexity and cost of traditional bearings, and helps to achieve miniaturization and lightweight of the device. Magnetic liquid sealing technology has the characteristics of low friction, low power consumption, long life and strong adaptability, and can effectively improve sealing performance and reduce leakage. The present invention is suitable for extreme working conditions such as strong magnetic fields, high vacuum, high temperature or low temperature, and has strong environmental adaptability. The present invention simplifies the structure and reduces the failure rate and maintenance cost of the device. Under high-speed rotation conditions, the present invention can effectively solve the problems of bearing heating and lubrication, and improve the reliability of the sealing system.

[0027] In some embodiments, the sealing sleeve 4 is sleeved on the rotating shaft 2, and the pole shoe unit 3 is connected to the housing 1 and is located outside the sealing sleeve 4. A first sealing groove 3013 is provided on the outer circumference of the first pole shoe 301, a first sealing ring 6 is provided in the first sealing groove 3013, and the outer circumference of the first sealing ring 6 is in contact with the inner circumference of the housing 1. A second sealing groove 3023 is provided on the outer circumference of the second pole shoe 302, a second sealing ring 7 is provided in the second sealing groove 3023, and the outer circumference of the second sealing ring 7 is in contact with the inner circumference of the housing 1. A third sealing groove 403 is provided on the inner circumference of the sealing sleeve 4, a third sealing ring 8 is provided in the third sealing groove 403, and the outer circumference of the third sealing ring 8 is in contact with the outer circumference of the rotating shaft 2.

[0028] For example, Figure 1 As shown, the sealing sleeve 4 is sleeved on the rotating shaft 2 and is located on the inner side of the pole shoe unit 3 , while the pole shoe unit 3 is connected to the housing 1 and is located on the outer side of the sealing sleeve 4 .

[0029] The outer circumference of the first sealing ring 6 is in contact with the inner circumference of the housing 1 to prevent the medium from leaking along the gap between the first pole shoe 301 and the housing 1. Similarly, the outer circumference of the second sealing ring 7 is in contact with the inner circumference of the housing 1 to prevent the medium from leaking along the gap between the second pole shoe 302 and the housing 1. The outer circumference of the third sealing ring 8 is in contact with the outer circumference of the shaft 2 to prevent the medium from leaking along the gap between the sealing sleeve 4 and the shaft 2.

[0030] Multiple sealing grooves and sealing rings are provided on the pole shoe unit 3 and the sealing sleeve 4 to achieve multiple sealing, which greatly improves the reliability and efficiency of the sealing. Each sealing ring fits the corresponding inner circumference, effectively preventing the medium from leaking along the gaps between different components. This design can adapt to the slight gap changes between the rotating shaft 2 and the housing 1 and maintain a good sealing effect. The multiple sealing structure helps to improve the performance of the entire system, reduce maintenance costs, and improve the operating efficiency of the rotating machinery.

[0031] In other embodiments, the pole shoe unit 3 is connected to the rotating shaft 2, the sealing sleeve 4 is sleeved on the rotating shaft 2 and located on the outside of the pole shoe unit 3, and the sealing sleeve 4 is connected to the housing 1. A first sealing groove 3013 is provided on the inner circumference of the first pole shoe 301, a first sealing ring 6 is provided in the first sealing groove 3013, and the inner circumference of the first sealing ring 6 is in contact with the outer circumference of the rotating shaft 2. A second sealing groove 3023 is provided on the inner circumference of the second pole shoe 302, a second sealing ring 7 is provided in the second sealing groove 3023, and the inner circumference of the second sealing ring 7 is in contact with the outer circumference of the rotating shaft 2. A third sealing groove 403 is provided on the outer circumference of the sealing sleeve 4, a third sealing ring 8 is provided in the third sealing groove 403, and the outer circumference of the third sealing ring 8 is in contact with the inner circumference of the housing 1.

[0032] For example, Figure 2 As shown, the pole shoe unit 3 is directly connected to the rotating shaft 2, which means that the pole shoe unit 3 is fixed on the rotating shaft 2 and rotates with it. The sealing sleeve 4 is located outside the pole shoe unit 3 and is connected to the housing 1. When the rotating shaft 2 rotates, the sealing sleeve 4 remains stationary.

[0033] The inner circumference of the first sealing ring 6 is in contact with the outer circumference of the rotating shaft 2 to prevent the medium from leaking along the gap between the first pole piece 301 and the rotating shaft 2. The inner circumference of the second sealing ring 7 is in contact with the outer circumference of the rotating shaft 2 to prevent the medium from leaking along the gap between the second pole piece 302 and the rotating shaft 2. The outer circumference of the third sealing ring 8 is in contact with the inner circumference of the housing 1 to prevent the medium from leaking along the gap between the sealing sleeve 4 and the housing 1.

[0034] Multiple sealing grooves and sealing rings are provided on the pole shoe unit 3 and the sealing sleeve 4 to achieve multiple sealing, which greatly improves the reliability and efficiency of the sealing. Each sealing ring fits the corresponding inner circumference, effectively preventing the medium from leaking along the gaps between different components. This design can adapt to the slight gap changes between the rotating shaft 2 and the housing 1 and maintain a good sealing effect. The multiple sealing structure helps to improve the performance of the entire system, reduce maintenance costs, and improve the operating efficiency of the rotating machinery.

[0035] In some embodiments, the first pole shoe 301 has a third end face 3011 and a fourth end face 3012 that are opposite to each other along the axial direction of the rotating shaft 2, and the third end face 3011 is disposed adjacent to the second pole shoe 302. The third end face 3011 is provided with a first pole tooth 303, and a sealing gap is formed between the first pole tooth 303 and the first end face 401. The design of the first pole tooth 303 can improve the adaptability of the sealing device to the radial displacement and axial displacement of the rotating shaft 2, ensuring that a good sealing effect can be maintained under different working conditions.

[0036] In some embodiments, the second pole shoe 302 has a fifth end face 3021 and a sixth end face 3022 that are opposite to each other along the axial direction of the rotating shaft 2, the fifth end face 3021 is disposed adjacent to the first pole shoe 301, the fifth end face 3021 is provided with a second pole tooth 304, and a sealing gap is formed between the second pole tooth 304 and the second end face 402. The design of the second pole tooth 304 can improve the adaptability of the sealing device to the radial displacement and axial displacement of the rotating shaft 2, ensuring that a good sealing effect can be maintained under different working conditions.

[0037] Optionally, there are multiple first pole teeth 303 , and the multiple first pole teeth 303 are arranged at intervals along the radial direction of the rotating shaft 2 .

[0038] A plurality of first pole teeth 303 are evenly arranged on the third end face 3011 of the first pole shoe 301, and the pole teeth are arranged at intervals along the radial direction of the rotating shaft 2. This distribution method helps to form multiple sealing points around the rotating shaft 2, thereby improving the uniformity and effectiveness of the seal. The magnetic liquid is filled in the sealing gap formed between the plurality of first pole teeth 303 and the first end face 401, and forms a stable sealing film under the action of the magnetic field. The design of multiple pole teeth increases the contact area of ​​the sealing film and improves the sealing effect.

[0039] Optionally, there are multiple second pole teeth 304 , and the multiple second pole teeth 304 are arranged at intervals along the radial direction of the rotating shaft 2 .

[0040] A plurality of second pole teeth 304 are evenly arranged on the fifth end face 3021 of the second pole shoe 302, and the pole teeth are arranged at intervals along the radial direction of the rotating shaft 2. This distribution method helps to form multiple sealing points around the rotating shaft 2, thereby improving the uniformity and effectiveness of the seal. The magnetic liquid fills the sealing gap formed between the plurality of second pole teeth 304 and the second end face 402, and forms a stable sealing film under the action of the magnetic field. The design of multiple pole teeth increases the contact area of ​​the sealing film and improves the sealing effect.

[0041] In some embodiments, a first groove 30111 is defined on the third end surface 3011 , and the first pole tooth 303 is located in the first groove 30111 .

[0042] The first groove 30111 can provide a certain degree of protection for the pole teeth and reduce wear caused by external factors (such as particles, friction, etc.). The first pole tooth 303 located in the first groove 30111 helps to form a more effective sealing gap, because the structure of the first groove 30111 can help better position and retain the magnetic liquid, thereby improving the sealing performance.

[0043] In some embodiments, a second groove 30221 is defined on the fifth end surface 3021 , and the second pole tooth 304 is located in the second groove 30221 .

[0044] The second groove 30221 can provide a certain degree of protection for the pole teeth and reduce wear caused by external factors (such as particles, friction, etc.). The second pole teeth 304 located in the second groove 30221 are helpful to form a more effective sealing gap, because the structure of the second groove 30221 can help the magnetic liquid to be better positioned and maintained, thereby improving the sealing performance.

[0045] In some embodiments, the cross-sectional area of ​​the first pole tooth 303 gradually decreases along the direction from the third end surface 3011 to the first end surface 401 .

[0046] The cross-sectional area of ​​the first pole teeth 303 gradually decreases from the third end face 3011 as it moves toward the first end face 401. This design allows the pole teeth to form a convergent shape in the radial direction of the rotating shaft 2. In the process of gradually decreasing cross-sectional area of ​​the first pole teeth 303, the magnetic liquid is guided through these convergent first pole teeth 303 under the action of the magnetic field to form an effective sealing film.

[0047] Due to the reduction in the cross-sectional area of ​​the first pole tooth 303, the magnetic liquid is more constrained when passing through the first pole tooth 303, which helps to form a denser sealing layer, thereby improving the sealing effect. The convergent shape of the first pole tooth 303 helps to stabilize the magnetic liquid sealing film and prevent the sealing film from being damaged during high-speed rotation. The gradual reduction in the cross-sectional area of ​​the first pole tooth 303 helps to reduce possible leakage paths and reduce the risk of leakage.

[0048] In some embodiments, the cross-sectional area of ​​the second pole tooth 304 gradually decreases along the direction from the fifth end surface 3021 to the second end surface 402 .

[0049] The cross-sectional area of ​​the second pole teeth 304 gradually decreases from the fifth end face 3021 as it moves toward the second end face 402. This design allows the second pole teeth 304 to form a convergent shape in the radial direction of the rotating shaft 2. In the process of gradually decreasing cross-sectional area of ​​the second pole teeth 304, the magnetic liquid is guided through these convergent second pole teeth 304 under the action of the magnetic field to form an effective sealing film.

[0050] Due to the reduction in the cross-sectional area of ​​the second pole teeth 304, the magnetic liquid is more constrained when passing through the second pole teeth 304, which helps to form a denser sealing layer, thereby improving the sealing effect. The convergent shape of the second pole teeth 304 helps to stabilize the magnetic liquid sealing film and prevent the sealing film from being damaged during high-speed rotation. The gradual reduction in the cross-sectional area of ​​the second pole teeth 304 helps to reduce possible leakage paths and reduce the risk of leakage.

[0051] In some embodiments, there are multiple magnetic liquid sealing assemblies, which are arranged at intervals along the axial direction of the rotating shaft 2. A first spacer 9 is provided between two adjacent pole shoe units 3, and the first spacer 9 is sleeved on the rotating shaft 2 and the two ends thereof are respectively stopped on the two adjacent pole shoe units 3. A second spacer 10 is provided between two adjacent sealing sleeves 4, and the second spacer 10 is sleeved on the rotating shaft 2 and the two ends thereof are respectively stopped on the two adjacent sealing sleeves 4.

[0052] The magnetic liquid sealing assembly is composed of multiple parts, each of which includes a pole shoe unit 3 and a sealing sleeve 4. These components are arranged at intervals along the axial direction of the rotating shaft 2 to form an integral sealing system composed of multiple sealing units. The function of the first spacer 9 is to maintain the spacing and relative positions between the pole shoe units 3 and provide additional support. The function of the second spacer 10 is to maintain the spacing and relative positions between the sealing sleeves 4 and ensure the correct alignment of the sealing sleeves 4. By providing the first spacer 9 and the second spacer 10, the stability of the entire magnetic liquid sealing assembly can be enhanced to prevent relative displacement between the components during high-speed rotation.

[0053] In some embodiments, the shell 1 includes a plurality of petal shells, and any two adjacent petal shells are detachably connected to each other, and the plurality of petal shells define a chamber 101 .

[0054] The housing 1 is composed of multiple split shells, and each split shell can be independently installed and disassembled. Adjacent split shells are connected by a detachable connection method, such as bolt connection, to form a complete housing 1 structure. The multiple split shells jointly define an internal chamber 101, which is the working space of the magnetic fluid sealing device and is used to accommodate the rotating shaft 2 and the magnetic fluid sealing assembly. The design of the split shells enables the housing 1 to be easily disassembled and assembled, facilitating the maintenance and replacement of the internal sealing components.

[0055] In some embodiments, a seal is provided between the mating surfaces of adjacent split shells. The seal is located between the mating surfaces of adjacent split shells and fills the gap between the two split shells. The purpose of the seal is to prevent the leakage of the medium through the gap of the split shell mating surface and ensure the sealing effect inside the housing 1.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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 thus cannot be construed as a limitation of the present invention.

[0057] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0058] In the present invention, unless otherwise clearly specified and defined, the terms "install", "connect", "couple", "fix", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0060] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0061] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An axial bearingless split-flap magnetic liquid sealing device, characterized in that: include: a housing defining a chamber; a rotating shaft, at least a portion of which is rotatably disposed in the chamber; A magnetic liquid sealing component, the magnetic liquid sealing component is arranged in the chamber, the magnetic liquid sealing component includes a pole shoe unit, a sealing sleeve and a permanent magnet, the pole shoe unit includes a first pole shoe and a second pole shoe, each of the first pole shoe and the second pole shoe is sleeved on the rotating shaft and arranged at intervals in the axial direction of the rotating shaft, the sealing sleeve is sleeved on the rotating shaft, one of the pole shoe unit and the sealing sleeve is connected to the shell, and the other of the pole shoe unit and the sealing sleeve is connected to the rotating shaft, the permanent magnet is arranged between the first pole shoe and the second pole shoe, the sealing sleeve has a first end face and a second end face opposite to each other along the axial direction of the rotating shaft, the first end face and the second end face are located between the first pole shoe and the second pole shoe in the axial direction of the rotating shaft, a sealing gap is defined between the first end face and the first pole shoe, and between the second end face and the second pole shoe, and the sealing gap is used to fill the magnetic liquid.

2. The axial bearingless split-flap magnetic liquid sealing device according to claim 1 is characterized in that: The first pole shoe has a third end face and a fourth end face which are opposite to each other along the axial direction of the rotating shaft, the third end face is arranged adjacent to the second pole shoe, a first pole tooth is arranged on the third end face, and the sealing gap is formed between the first pole tooth and the first end face; and / or The second pole shoe has a fifth end face and a sixth end face which are opposite to each other along the axial direction of the rotating shaft. The fifth end face is arranged adjacent to the first pole shoe. A second pole tooth is arranged on the fifth end face. The sealing gap is formed between the second pole tooth and the second end face.

3. The axial bearingless split-flap magnetic liquid sealing device according to claim 2 is characterized in that: There are a plurality of first polar teeth, and the plurality of first polar teeth are arranged at intervals along the radial direction of the rotating shaft; and / or There are a plurality of second polar teeth, and the plurality of second polar teeth are arranged at intervals along the radial direction of the rotating shaft.

4. The axial bearingless split-flap magnetic liquid sealing device according to claim 3 is characterized in that: A first groove is formed on the third end surface, and the first pole tooth is located in the first groove; and / or A second groove is formed on the fifth end surface, and the second pole tooth is located in the second groove.

5. The axial bearingless split-flap magnetic liquid sealing device according to claim 2, characterized in that: The cross-sectional area of ​​the first pole tooth gradually decreases along the direction from the third end surface to the first end surface; And / or the cross-sectional area of ​​the second pole tooth gradually decreases along the direction from the fifth end face to the second end face.

6. The axial bearingless split-flap magnetic liquid sealing device according to claim 1, characterized in that: The sealing sleeve is sleeved on the rotating shaft, the pole shoe unit is connected to the shell and is located on the outside of the sealing sleeve, a first sealing groove is provided on the outer circumferential surface of the first pole shoe, a first sealing ring is provided in the first sealing groove and the outer circumferential surface of the first sealing ring is fitted with the inner circumferential surface of the shell, a second sealing groove is provided on the outer circumferential surface of the second pole shoe, a second sealing ring is provided in the second sealing groove and the outer circumferential surface of the second sealing ring is fitted with the inner circumferential surface of the shell, a third sealing groove is provided on the inner circumferential surface of the sealing sleeve, a third sealing ring is provided in the third sealing groove and the outer circumferential surface of the third sealing ring is fitted with the outer circumferential surface of the rotating shaft.

7. The axial bearingless split-flap magnetic liquid sealing device according to claim 1, characterized in that: The pole shoe unit is connected to the rotating shaft, the sealing sleeve is sleeved on the rotating shaft and located on the outside of the pole shoe unit, the sealing sleeve is connected to the shell, a first sealing groove is opened on the inner circumference of the first pole shoe, a first sealing ring is arranged in the first sealing groove and the inner circumference of the first sealing ring is fitted with the outer circumference of the rotating shaft, a second sealing groove is opened on the inner circumference of the second pole shoe, a second sealing ring is arranged in the second sealing groove and the inner circumference of the second sealing ring is fitted with the outer circumference of the rotating shaft, a third sealing groove is opened on the outer circumference of the sealing sleeve, a third sealing ring is arranged in the third sealing groove and the outer circumference of the third sealing ring is fitted with the inner circumference of the shell.

8. The axial bearingless split-flap magnetic liquid sealing device according to claim 1, characterized in that: There are multiple magnetic liquid sealing components, and the multiple magnetic liquid sealing components are arranged at intervals along the axial direction of the rotating shaft. A first spacer is provided between two adjacent pole shoe units, the first spacer is sleeved on the rotating shaft and the two ends are respectively stopped on the two adjacent pole shoe units, and a second spacer is provided between two adjacent sealing sleeves, the second spacer is sleeved on the rotating shaft and the two ends are respectively stopped on the two adjacent sealing sleeves.

9. The axial bearingless split-flap magnetic liquid sealing device according to claim 1, characterized in that: The shell body comprises a plurality of petal shells, two adjacent petal shells are detachably connected to each other, and the plurality of petal shells define the chamber.

10. The axial bearingless split-flap magnetic liquid sealing device according to claim 9, characterized in that: A sealing member is provided between the joint surfaces of two adjacent petal shells.

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