Magnetic fluid seal with combined pole piece

Abstract

This invention provides a magnetic liquid sealing device with combined pole shoes. The magnetic liquid sealing device with combined pole shoes includes: a housing, a shaft, a permanent magnet, a first pole shoe assembly, and a second pole shoe assembly. The housing has a cavity, the shaft passes through the housing, the permanent magnet is disposed within the cavity of the housing and sleeved on the shaft, the first pole shoe assembly and the second pole shoe assembly are both disposed within the cavity of the housing and sleeved on the shaft, and the permanent magnet is located between the first pole shoe assembly and the second pole shoe assembly. The first pole shoe assembly includes multiple pole shoes that are sequentially and detachably connected along the axial direction of the shaft, and the second pole shoe assembly includes multiple pole shoes that are sequentially and detachably connected along the axial direction of the shaft. The magnetic liquid sealing device with combined pole shoes of this invention has the advantages of adjustable sealing performance and good versatility.

Description

Technical Field

[0001] This invention relates to the field of sealing technology, and more specifically, to a magnetic liquid sealing device with a combined pole shoe. Background Technology

[0002] In magnetic fluid sealing devices, pole shoes are crucial components for forming closed magnetic circuits. The pole teeth on the pole shoes enhance the local magnetic field, thereby confining the magnetic fluid within the sealing gap and achieving a sealing effect. The shape and number of the pole teeth directly affect the sealing capability of the magnetic fluid sealing device. In related technologies, magnetic fluid sealing devices have one pole shoe on each side of the permanent magnet. The shape and number of the pole teeth on the pole shoes are fixed, resulting in fixed sealing performance and poor versatility. Summary of the Invention

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

[0004] Therefore, embodiments of the present invention propose a magnetic liquid sealing device with a combined pole shoe, which has the advantages of adjustable sealing performance and good versatility.

[0005] The magnetic liquid sealing device with combined pole shoes according to an embodiment of the present invention includes:

[0006] A housing having a cavity;

[0007] A shaft, which passes through the housing;

[0008] A permanent magnet is disposed within the cavity of the housing and sleeved on the shaft;

[0009] A first pole shoe assembly and a second pole shoe assembly are both disposed within the cavity of the housing and sleeved on the shaft. The permanent magnet is located between the first pole shoe assembly and the second pole shoe assembly. The first pole shoe assembly includes a plurality of pole shoes that are detachably connected sequentially along the axial direction of the shaft. Each of the plurality of pole shoes in the first pole shoe assembly is provided with a pole tooth that is clearance-fitted with the shaft. The second pole shoe assembly includes a plurality of pole shoes that are detachably connected sequentially along the axial direction of the shaft. Each of the plurality of pole shoes in the second pole shoe assembly is provided with a pole tooth that is clearance-fitted with the shaft.

[0010] The magnetic liquid sealing device with combined pole shoes of the present invention has the advantages of adjustable sealing performance and good versatility.

[0011] In some embodiments, the plurality of pole shoes of the first pole shoe assembly are magnetically attracted together, and the plurality of pole shoes of the second pole shoe assembly are magnetically attracted together.

[0012] In some embodiments, at least two of the plurality of pole shoes in the first pole shoe assembly have different pole tooth shapes, and at least two of the plurality of pole shoes in the second pole shoe assembly have different pole tooth shapes.

[0013] In some embodiments, at least two of the plurality of pole shoes in the first pole shoe assembly have different numbers of pole teeth, and at least two of the plurality of pole shoes in the second pole shoe assembly have different numbers of pole teeth.

[0014] In some embodiments, the housing includes a first end and a second end opposite to each other in the axial direction of the shaft, the first end having an opening communicating with the cavity, the second end having an end cap sealing the cavity, the first pole shoe assembly being located on the side of the permanent magnet adjacent to the first end, and the second pole shoe assembly being located on the side of the permanent magnet adjacent to the second end.

[0015] In some embodiments, the magnetic fluid sealing device with combined pole shoes further includes a first bearing and a second bearing, both of which are located on the side of the first pole shoe assembly adjacent to the first end.

[0016] In some embodiments, the first pole shoe assembly includes a first guide tube, and a plurality of pole shoes of the first pole shoe assembly are located within the first guide tube; the second pole shoe assembly includes a second guide tube, and a plurality of pole shoes of the second pole shoe assembly are located within the second guide tube; the permanent magnet is located between the first guide tube and the second guide tube.

[0017] In some embodiments, the first guide cylinder includes a first cylinder body and a first end plate connected together, the first end plate being located at one end of the first cylinder body adjacent to the permanent magnet and abutting against the permanent magnet; the second guide cylinder includes a second cylinder body and a second end plate connected together, the second end plate being located at one end of the second cylinder body adjacent to the permanent magnet and abutting against the permanent magnet; both the first guide cylinder and the second guide cylinder are magnetically conductive.

[0018] In some embodiments, the outer peripheral surface of the first guide cylinder contacts the inner peripheral surface of the housing, the outer peripheral surface of the second guide cylinder contacts the inner peripheral surface of the housing, and the inner peripheral surface of the housing is provided with a first annular groove corresponding to the first guide cylinder and a second annular groove corresponding to the second guide cylinder. A first sealing ring is provided in the first annular groove, and a second sealing ring is provided in the second annular groove.

[0019] In some embodiments, the outer peripheral surface of each of the plurality of pole shoes of the first pole shoe assembly contacts the inner peripheral surface of the first guide cylinder, and the outer peripheral surface of each of the plurality of pole shoes of the first pole shoe assembly is provided with a third annular groove, wherein a third sealing ring is provided in the third annular groove.

[0020] The outer peripheral surface of each of the plurality of pole shoes in the second pole shoe assembly contacts the inner peripheral surface of the second guide cylinder, and the outer peripheral surface of each of the plurality of pole shoes in the second pole shoe assembly is provided with a fourth annular groove, wherein a fourth sealing ring is provided in the fourth annular groove. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a magnetic liquid sealing device with a combined pole shoe according to an embodiment of the present invention.

[0022] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0023] Figure 3 This is a schematic diagram of the structure of the first guide cylinder or the second guide cylinder according to an embodiment of the present invention.

[0024] Figure label:

[0025] Shaft 10; Shoulder 11;

[0026] 20 housing; 21 first end; 22 second end; 23 flange; 201 cavity; 2011 opening;

[0027] Permanent magnet 30;

[0028] First pole shoe assembly 40; First pole shoe 41; Second pole shoe 42; Third pole shoe 43; First guide cylinder 44; First cylinder body 441; First end plate 442;

[0029] Second pole shoe assembly 50; Fourth pole shoe 51; Fifth pole shoe 52; Sixth pole shoe 53; Second guide cylinder 54; Second cylinder body 541; Second end plate 542;

[0030] First bearing 60; second bearing 70. Detailed Implementation

[0031] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0032] like Figure 1 and Figure 2As shown, the magnetic liquid sealing device with combined pole shoes according to an embodiment of the present invention includes a housing 20, a shaft 10, a permanent magnet 30, a first pole shoe assembly 40, and a second pole shoe assembly 50. The housing 20 has a cavity 201, and the shaft 10 passes through the housing 20, that is, the peripheral wall of the housing 20 forms the cavity 201, and the shaft 10 passes through the cavity 201. The permanent magnet 30 is disposed in the cavity 201 of the housing 20, and the permanent magnet 30 is sleeved on the shaft 10.

[0033] The first pole shoe assembly 40 and the second pole shoe assembly 50 are both disposed within the cavity 201 of the housing 20 and sleeved on the shaft 10, with the permanent magnet 30 located between the first pole shoe assembly 40 and the second pole shoe assembly 50. The first pole shoe assembly 40 includes a plurality of axial components along the shaft 10 (e.g., ...). Figure 1 The first pole shoe assembly 40 comprises a plurality of pole shoes that are detachably connected in sequence along the left and right directions of the shaft 10. Each of the plurality of pole shoes in the first pole shoe assembly 40 is provided with a pole tooth that is clearance-fitted with the shaft 10. The second pole shoe assembly 50 comprises a plurality of pole shoes that are detachably connected in sequence along the axial direction of the shaft 10. Each of the plurality of pole shoes in the second pole shoe assembly 50 is provided with a pole tooth that is clearance-fitted with the shaft 10.

[0034] like Figure 1 As shown, the housing 20 includes a first end 21 (as shown) opposite the shaft 10 in the axial direction. Figure 1 The left end of the middle shell 20) and the second end 22 (as shown) Figure 1 The right end of the housing 20 has a first end 21 with an opening 2011 communicating with the cavity 201, and a second end 22 with an end cap sealing the cavity 201. The first pole shoe assembly 40 is located on the side of the permanent magnet 30 adjacent to the first end 21, and the second pole shoe assembly 50 is located on the side of the permanent magnet 30 adjacent to the second end 22. The outer circumferential surface of the housing 20 also has a flange 23 located near the left end.

[0035] That is, the left end of the housing 20 is provided with an opening 2011 that communicates with the cavity 201, the right end of the housing 20 is provided with an end cap that seals the cavity 201, the first pole shoe assembly 40 is located on the left side of the permanent magnet 30, and the second pole shoe assembly 50 is located on the right side of the permanent magnet 30.

[0036] It should be noted that the tooth shape of the magnetic fluid sealing device in related technologies is mostly rectangular, triangular, or trapezoidal, with several teeth arranged linearly to form a sealing unit. Triangular teeth can generate the largest magnetic field strength, but their effective sealing area is small, and the volume of magnetic fluid they can bind is the smallest; trapezoidal teeth can generate a larger magnetic field strength and have the largest effective sealing area, and have a good ability to prevent lateral movement of magnetic fluid; rectangular teeth have a strong magnetic field strength and are relatively easy to manufacture, so they have been widely used in traditional magnetic fluid sealing.

[0037] It is understandable that the multiple pole shoes of the first pole shoe assembly 40 are detachably connected, and the number and type of pole shoes in the first pole shoe assembly 40 can be adjusted according to actual operating conditions and sealing requirements. Similarly, the multiple pole shoes of the second pole shoe assembly 50 are detachably connected, and the number and type of pole shoes in the second pole shoe assembly 50 can be adjusted according to actual operating conditions and sealing requirements. Different types of pole shoes have different tooth shapes and numbers; that is, the pole shoes are classified according to the tooth shape and number.

[0038] Specifically, when the sealing requirement is low (i.e., the sealing pressure is low), multiple pole shoes of the first pole shoe assembly 40 and multiple pole shoes of the second pole shoe assembly 50 are replaced with pole shoes with rectangular pole teeth, thereby meeting the sealing requirement at a lower cost. When the sealing requirement is high (i.e., the sealing pressure is high), at least one of the multiple pole shoes of the first pole shoe assembly 40 and at least one of the multiple pole shoes of the second pole shoe assembly 50 are replaced with pole shoes with trapezoidal pole teeth, and the inclined surface of the trapezoidal pole teeth is located on the high-pressure side.

[0039] When the sealing pressure is alternating and relatively low, the multiple pole shoes of the first pole shoe assembly 40 and the multiple pole shoes of the second pole shoe assembly 50 are replaced with pole shoes having triangular pole teeth.

[0040] When the sealing pressure is alternating and relatively high, the pole shoes located on the left and right sides of the multiple pole shoes in the first pole shoe assembly 40 are replaced with pole shoes with trapezoidal pole teeth, and the beveled surface of the pole teeth of the pole shoe located on the left faces to the left, and the beveled surface of the pole teeth of the pole shoe located on the right faces to the right; the pole shoes located on the left and right sides of the multiple pole shoes in the second pole shoe assembly 50 are replaced with pole shoes with trapezoidal pole teeth, and the beveled surface of the pole teeth of the pole shoe located on the left faces to the left, and the beveled surface of the pole teeth of the pole shoe located on the right faces to the right.

[0041] In other words, when the sealing pressure is alternating and relatively high, the pole shoes of the first pole shoe assembly 40 adjacent to the left end of the housing 20 and the pole shoes adjacent to the permanent magnet 30 are replaced with pole shoes having trapezoidal pole teeth. The inclined surface of the pole teeth of the pole shoe adjacent to the left end of the housing 20 faces to the left, and the inclined surface of the pole teeth of the pole shoe adjacent to the permanent magnet 30 faces to the right. The pole shoes of the first pole shoe assembly 40 adjacent to the right end of the housing 20 and the pole shoes adjacent to the permanent magnet 30 are replaced with pole shoes having trapezoidal pole teeth. The inclined surface of the pole teeth of the pole shoe adjacent to the right end of the housing 20 faces to the right, and the inclined surface of the pole teeth of the pole shoe adjacent to the permanent magnet 30 faces to the left.

[0042] Specifically, such as Figure 1As shown, the first pole shoe assembly 40 includes a first pole shoe 41, a second pole shoe 42, and a third pole shoe 43 that are detachably connected sequentially along the axial direction of shaft 10. The pole teeth of the first pole shoe 41 and the second pole shoe 42 are trapezoidal pole teeth, and the pole teeth of the second pole shoe 42 are rectangular pole teeth. The beveled surface of the pole teeth of the first pole shoe 41 faces to the left, and the beveled surface of the pole teeth of the third pole shoe 43 faces to the right. The second pole shoe assembly 50 includes a fourth pole shoe 51, a fifth pole shoe 52, and a sixth pole shoe 53 that are detachably connected sequentially along the axial direction of shaft 10. The pole teeth of the fourth pole shoe 51 and the sixth pole shoe 53 are trapezoidal pole teeth, and the pole teeth of the fifth pole shoe 52 are rectangular pole teeth. The beveled surface of the pole teeth of the fourth pole shoe 51 faces to the right, and the beveled surface of the pole teeth of the sixth pole shoe 53 faces to the left.

[0043] In other words, the magnetic liquid sealing device with combined pole shoes in the embodiments of the present invention can adjust the number and type of pole shoes of the first pole shoe assembly 40 and the second pole shoe assembly 50, thereby meeting different actual working conditions and sealing requirements. Therefore, the sealing performance is adjustable and has good versatility.

[0044] Therefore, the magnetic liquid sealing device with combined pole shoes of the present invention has the advantages of adjustable sealing performance and good versatility.

[0045] In some embodiments, such as Figure 1 As shown, multiple pole shoes of the first pole shoe assembly 40 are magnetically attracted together, and multiple pole shoes of the second pole shoe assembly 50 are magnetically attracted together.

[0046] Understandably, the multiple pole shoes of the first pole shoe assembly 40 and the multiple pole shoes of the second pole shoe assembly 50 are in sequential contact along the axial direction of the shaft 10. The permanent magnet 30 generates a magnetic field, and the multiple pole shoes of the first pole shoe assembly 40 and the multiple pole shoes of the second pole shoe assembly 50 are located within this magnetic field. Therefore, the multiple pole shoes of the first pole shoe assembly 40 and the multiple pole shoes of the second pole shoe assembly 50 are magnetically attracted together. The multiple pole shoes of the first pole shoe assembly 40 and the multiple pole shoes of the second pole shoe assembly 50 do not require connecting parts, facilitating installation and disassembly.

[0047] In some embodiments, such as Figure 1 and Figure 2 As shown, at least two of the multiple pole shoes in the first pole shoe assembly 40 have different pole tooth shapes, and at least two of the multiple pole shoes in the second pole shoe assembly 50 have different pole tooth shapes.

[0048] In other embodiments, at least two of the plurality of pole shoes in the first pole shoe assembly 40 have different numbers of pole teeth, and at least two of the plurality of pole shoes in the second pole shoe assembly 50 have different numbers of pole teeth.

[0049] It should be noted that in practical applications, a single type of pole tooth parameter (tooth shape and number of teeth) is insufficient to simultaneously achieve both magnetic field strength and effective sealing area, thus failing to meet sealing requirements. For example, when the sealing pressure difference is large, the magnetic liquid sealing ring on the high-pressure side is most prone to rupture, resulting in a decrease in the overall pressure resistance of the magnetic liquid sealing device. The number of pole teeth is also difficult to adjust according to changes in actual operating conditions. Too many pole teeth will increase frictional resistance, while too few pole teeth may lead to seal failure.

[0050] Therefore, the first pole shoe assembly 40 has at least two types of pole shoes, and the second pole shoe assembly 50 has at least two types of pole shoes. The shape and number of pole teeth can be adjusted according to the actual working conditions, so as to balance the magnetic field strength and the effective sealing area, thereby meeting the sealing requirements.

[0051] In some embodiments, such as Figure 1 As shown, the magnetic liquid sealing device with combined pole shoes in this embodiment of the invention further includes a first bearing 60 and a second bearing 70, both of which are located on the side of the first pole shoe assembly 40 adjacent to the first end 21. The shaft 10 is a rotating shaft and has a shoulder 11 located between the first bearing 60 and the second bearing 70. Alternatively, the shaft 10 can also be a sliding shaft.

[0052] In other words, the first bearing 60 and the second bearing 70 are both located on the left side of the first pole shoe assembly 40, and the first pole shoe assembly 40, the permanent magnet 30 and the second pole shoe assembly 50 are arranged adjacent to the end cap.

[0053] Understandably, when it is necessary to change the type of pole shoe or change the number of pole shoes, the first pole shoe assembly 40, the permanent magnet 30 and the second pole shoe assembly 50 can be taken out by opening the end cover without disassembling the first bearing 60 and the second bearing 70, thus making it convenient to change the type of pole shoe and change the number of pole shoes.

[0054] In some embodiments, such as Figure 1 As shown, the first pole shoe assembly 40 includes a first guide cylinder 44, and a plurality of pole shoes of the first pole shoe assembly 40 are located inside the first guide cylinder 44. The second pole shoe assembly 50 includes a second guide cylinder 54, and a plurality of pole shoes of the second pole shoe assembly 50 are located inside the second guide cylinder 54. The permanent magnet 30 is located between the first guide cylinder 44 and the second guide cylinder 54.

[0055] Understandably, multiple pole shoes of the first pole shoe assembly 40 are located within the cavity of the first guide cylinder 44, and multiple pole shoes of the second pole shoe assembly 50 are located within the cavity of the second guide cylinder 54. The first guide cylinder 44 and the second guide cylinder 54 can position the permanent magnet 30, eliminating the need for the pole shoes to position other components, thus facilitating the adjustment of the number of pole shoes in the first pole shoe assembly 40 and the second pole shoe assembly 50.

[0056] In some embodiments, such as Figure 1 and Figure 3 As shown, the first guide cylinder 44 includes a first cylinder body 441 and a first end plate 442 connected together. The first end plate 442 is located at the end of the first cylinder body 441 adjacent to the permanent magnet 30 and abuts against the permanent magnet 30. The second guide cylinder 54 includes a second cylinder body 541 and a second end plate 542 connected together. The second end plate 542 is located at the end of the second cylinder body 541 adjacent to the permanent magnet 30 and abuts against the permanent magnet 30. Both the first guide cylinder 44 and the second guide cylinder 54 are magnetic.

[0057] It is understandable that both the first guide cylinder 44 and the second guide cylinder 54 are magnetic, so that the multiple pole shoes of the first pole shoe assembly 40 can be located inside the cavity of the first guide cylinder 44 and not in contact with the permanent magnet 30 or other components, and will not affect the multiple pole shoes of the first pole shoe assembly 40 being magnetically attracted together; the multiple pole shoes of the second pole shoe assembly 50 can be located inside the cavity of the second guide cylinder 54 and not in contact with the permanent magnet 30 or other components, and will not affect the multiple pole shoes of the second pole shoe assembly 50 being magnetically attracted together.

[0058] In addition, the first end plate 442 can separate the permanent magnet 30 from the pole shoe of the first pole shoe assembly 40, thereby protecting the pole shoe of the first pole shoe assembly 40. The second end plate 542 can separate the permanent magnet 30 from the pole shoe of the second pole shoe assembly 50, thereby protecting the pole shoe of the second pole shoe assembly 50. Therefore, the service life of the first pole shoe assembly 40 and the pole shoe of the second pole shoe assembly 50 can be increased.

[0059] In some embodiments, such as Figure 1 As shown, the outer peripheral surface of the first guide cylinder 44 is in contact with the inner peripheral surface of the housing 20, and the outer peripheral surface of the second guide cylinder 54 is in contact with the inner peripheral surface of the housing 20. The inner peripheral surface of the housing 20 is provided with a first annular groove corresponding to the first guide cylinder 44 and a second annular groove corresponding to the second guide cylinder 54. A first sealing ring is provided in the first annular groove, and a second sealing ring is provided in the second annular groove.

[0060] Understandably, the first sealing ring can prevent the sealed medium from leaking between the inner circumferential surface of the housing 20 and the outer circumferential surface of the first guide cylinder 44, and the second sealing ring can prevent the sealed medium from leaking between the inner circumferential surface of the housing 20 and the outer circumferential surface of the second guide cylinder 54.

[0061] In some embodiments, such as Figure 1As shown, the outer peripheral surface of each of the plurality of pole shoes in the first pole shoe assembly 40 contacts the inner peripheral surface of the first guide cylinder 44. The outer peripheral surface of each of the plurality of pole shoes in the first pole shoe assembly 40 is provided with a third annular groove, and a third sealing ring is provided in the third annular groove. The third sealing ring can prevent the sealed medium from leaking between the outer peripheral surface of the pole shoe of the first pole shoe assembly 40 and the inner peripheral surface of the first guide cylinder 44.

[0062] The outer peripheral surface of each of the plurality of pole shoes in the second pole shoe assembly 50 contacts the inner peripheral surface of the second guide cylinder 54. The outer peripheral surface of each of the plurality of pole shoes in the second pole shoe assembly 50 is provided with a fourth annular groove, and a fourth sealing ring is provided in the fourth annular groove. The fourth sealing ring can prevent the sealed medium from leaking between the outer peripheral surface of the pole shoe of the second pole shoe assembly 50 and the inner peripheral surface of the second guide cylinder 54.

[0063] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0064] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0065] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0066] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0067] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0068] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A magnetic liquid sealing device with a combined pole shoe, characterized in that, include: A housing having a cavity; A shaft, which passes through the housing; A permanent magnet is disposed within the cavity of the housing and sleeved on the shaft; A first pole shoe assembly and a second pole shoe assembly are both disposed within the cavity of the housing and sleeved on the shaft. The permanent magnet is located between the first pole shoe assembly and the second pole shoe assembly. The first pole shoe assembly includes a plurality of pole shoes that are detachably connected sequentially along the axial direction of the shaft. Each of the plurality of pole shoes in the first pole shoe assembly has a pole tooth that is clearance-fitted with the shaft. The second pole shoe assembly also includes a plurality of pole shoes that are detachably connected sequentially along the axial direction of the shaft. Each of the plurality of pole shoes in the second pole shoe assembly has a pole tooth that is clearance-fitted with the shaft. At least two pole shoes in the first pole shoe assembly have different pole tooth shapes, at least two pole shoes in the second pole shoe assembly have different pole tooth shapes, at least two pole shoes in the first pole shoe assembly have different numbers of pole teeth, and at least two pole shoes in the second pole shoe assembly have different numbers of pole teeth.

2. The magnetic liquid sealing device with combined pole shoes according to claim 1, characterized in that, The multiple pole shoes of the first pole shoe assembly are magnetically attracted together, and the multiple pole shoes of the second pole shoe assembly are magnetically attracted together.

3. The magnetic liquid sealing device with combined pole shoes according to claim 1, characterized in that, The housing includes a first end and a second end opposite to each other in the axial direction of the shaft. The first end has an opening communicating with the cavity, and the second end has an end cap that seals the cavity. The first pole shoe assembly is located on the side of the permanent magnet adjacent to the first end, and the second pole shoe assembly is located on the side of the permanent magnet adjacent to the second end.

4. The magnetic liquid sealing device with combined pole shoes according to claim 3, characterized in that, It also includes a first bearing and a second bearing, both of which are located on the side of the first pole shoe assembly adjacent to the first end.

5. The magnetic liquid sealing device with combined pole shoes according to claim 1, characterized in that, The first pole shoe assembly includes a first guide cylinder, and a plurality of pole shoes of the first pole shoe assembly are located inside the first guide cylinder. The second pole shoe assembly includes a second guide cylinder, and a plurality of pole shoes of the second pole shoe assembly are located inside the second guide cylinder. The permanent magnet is located between the first guide cylinder and the second guide cylinder.

6. The magnetic liquid sealing device with combined pole shoes according to claim 5, characterized in that, The first guide cylinder includes a first cylinder body and a first end plate connected together. The first end plate is located at the end of the first cylinder body adjacent to the permanent magnet and abuts against the permanent magnet. The second guide cylinder includes a second cylinder body and a second end plate connected together. The second end plate is located at the end of the second cylinder body adjacent to the permanent magnet and abuts against the permanent magnet. Both the first guide cylinder and the second guide cylinder are magnetic.

7. The magnetic liquid sealing device with combined pole shoes according to claim 6, characterized in that, The outer peripheral surface of the first guide cylinder contacts the inner peripheral surface of the housing, and the outer peripheral surface of the second guide cylinder contacts the inner peripheral surface of the housing. The inner peripheral surface of the housing is provided with a first annular groove corresponding to the first guide cylinder and a second annular groove corresponding to the second guide cylinder. A first sealing ring is provided in the first annular groove, and a second sealing ring is provided in the second annular groove.

8. The magnetic liquid sealing device with combined pole shoes according to claim 7, characterized in that, The outer peripheral surface of each of the plurality of pole shoes in the first pole shoe assembly contacts the inner peripheral surface of the first guide cylinder. The outer peripheral surface of each of the plurality of pole shoes in the first pole shoe assembly is provided with a third annular groove, and a third sealing ring is provided in the third annular groove. The outer peripheral surface of each of the plurality of pole shoes in the second pole shoe assembly contacts the inner peripheral surface of the second guide cylinder, and the outer peripheral surface of each of the plurality of pole shoes in the second pole shoe assembly is provided with a fourth annular groove, wherein a fourth sealing ring is provided in the fourth annular groove.

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