Magnetic liquid sealing device with supporting function

Abstract

The magnetic liquid sealing device with the supporting function comprises a shell, a rotating shaft, a micro-texture layer, a pole shoe assembly, magnetic liquid and a liquid blocking coating, and the shell is provided with an inner cavity; the rotating shaft is rotatably arranged in the inner cavity of the shell; the microtexture layer is arranged in the circumferential direction of at least part of the section of the rotating shaft, the pole shoe assembly is connected with the shell and comprises a first pole shoe, a second pole shoe and a magnetic source, the magnetic source is located between the first pole shoe and the second pole shoe, and the first pole shoe and the second pole shoe both correspond to the microtexture layer in the radial direction of the rotating shaft. A sealing gap is formed between the first pole shoe and the micro-texture layer, and a sealing gap is formed between the second pole shoe and the micro-texture layer; the magnetic liquid is filled in the sealing gap to form a magnetic liquid sealing ring; the periphery of a part of the section of the rotating shaft or the periphery of a part of the section of the micro-texture layer is coated with the liquid blocking coating so as to form liquid blocking rings, and the liquid blocking rings are arranged on the two sides of the magnetic liquid sealing ring so as to prevent magnetic liquid from flowing in the axial direction of the rotating shaft.

Description

Technical Field

[0001] The invention belongs to the technical field of sealing, and in particular relates to a magnetic liquid sealing device with a supporting function. Background Art

[0002] Compared with traditional sealing methods, the sealing form using magnetic liquid as the sealing medium has a series of advantages such as low leakage rate, high pressure resistance, high and low temperature resistance, and high speed resistance. It plays an important role in many fields such as aerospace, nuclear energy, and chemical industry.

[0003] In the related art, when the magnetic liquid sealing device is in use, once the shaft deflects, it often causes collision and wear on the pole shoes and pole teeth, causing the seal to fail. Therefore, when in use, auxiliary bearings are generally installed next to it to avoid this situation. In many cases, such as aviation, aerospace, or occasions with limited space, it is often impossible to install auxiliary bearings or it requires additional high costs. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention provides a magnetic liquid sealing device with a supporting function that can suppress the axial movement of the magnetic liquid in the rotating shaft and improve the sealing performance.

[0006] The magnetic liquid sealing device with supporting function according to the embodiment of the present invention comprises:

[0007] a housing having an inner cavity;

[0008] A rotating shaft, the rotating shaft being rotatably disposed in the inner cavity of the shell;

[0009] A micro-textured layer, wherein the micro-textured layer is arranged in the circumference of at least a portion of the rotating shaft,

[0010] A pole shoe assembly, the pole shoe assembly is connected to the housing, the pole shoe assembly comprises a first pole shoe, a second pole shoe and a magnetic source, the first pole shoe and the second pole shoe are arranged at intervals along the circumferential direction of the rotating shaft, the magnetic source is located between the first pole shoe and the second pole shoe, the first pole shoe and the second pole shoe both correspond to the micro-textured layer in the radial direction of the rotating shaft, and there is a sealed gap between the first pole shoe and the micro-textured layer, and between the second pole shoe and the micro-textured layer;

[0011] A magnetic liquid is filled in the sealing gap to form a magnetic liquid sealing ring;

[0012] A liquid-blocking coating is coated on the circumference of a portion of the rotating shaft or the circumference of a portion of the micro-textured layer to form a liquid-blocking ring. The liquid-blocking ring is provided on both sides of the magnetic liquid sealing ring to prevent the magnetic liquid from flowing axially along the rotating shaft.

[0013] The magnetic liquid sealing device of the embodiment of the present invention can suppress the axial movement of the magnetic liquid on the rotating shaft, so that the magnetic liquid is stably distributed in the sealing gap, and utilizes the magnetic liquid adsorbed in the sealing gap to provide bearing capacity for the rotating shaft, improve the sealing performance, and support the rotating shaft, thereby improving the anti-sway ability of the rotating shaft.

[0014] In some embodiments, the first pole shoe and the second pole shoe have a plurality of pole teeth, and the plurality of pole teeth located on the first pole shoe and the plurality of pole teeth located on the second pole shoe are arranged at intervals along the axial direction of the rotating shaft, and the sealing gap is formed between each of the pole teeth and the micro-textured layer.

[0015] In some embodiments, a sleeve is further included, wherein the sleeve is sleeved on the rotating shaft, and the micro-textured layer is arranged on the sleeve.

[0016] In some embodiments, the micro-textured layer is formed by machining the outer surface of a partial section of the sleeve.

[0017] In some embodiments, the micro-textured layer is a plurality of grooves opened on the outer wall surface of the sleeve.

[0018] In some embodiments, an annular groove is provided on the outer wall of the sleeve, and the micro-texture layer is embedded in the annular groove.

[0019] In some embodiments, a dimension of the liquid-resistant coating in a radial direction of the rotating shaft protrudes beyond that of the micro-textured layer.

[0020] In some embodiments, the first pole shoe and the second pole shoe are provided with cooling water grooves, and the housing is provided with a water inlet and a water outlet corresponding to the cooling water grooves;

[0021] And / or, a seal is provided between the first pole shoe and the second pole shoe and the inner wall of the housing.

[0022] In some embodiments, two end covers are further included, and the two end covers are respectively connected to the axial ends of the shell.

[0023] In some embodiments, a limiting boss is provided at one end of the inner cavity, and a magnetic isolation ring is provided between the limiting boss and one of the first pole shoe and the second pole shoe; a magnetic isolation ring is also provided between the end cover away from the limiting boss and the other of the first pole shoe and the second pole shoe;

[0024] And / or, a seal is provided between the end cover and the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of a magnetic liquid sealing device with a supporting function according to an embodiment of the present invention.

[0026] Figure 2 Schematic diagram of the development of the micro-texture layer of an embodiment of the present invention.

[0027] Figure 3 Schematic diagram of the development of a micro-texture layer according to another embodiment of the present invention.

[0028] Figure 4 Schematic diagram of the development of a micro-texture layer according to another embodiment of the present invention.

[0029] Reference numerals:

[0030] 1. Shell; 11. Limiting boss; 12. Water inlet; 13. Water outlet;

[0031] 2. rotating shaft; 21. shaft sleeve; 22. micro-textured layer; 221. groove; 23. liquid-blocking coating; 24. annular sink;

[0032] 31. First pole shoe; 32. Second pole shoe; 33. Magnetic source; 34. Pole teeth; 35. Sealing gap; 36. Magnetic fluid; 37. Cooling water tank

[0033] 4. Magnetic isolation ring;

[0034] 5. Seals;

[0035] 6. End cap. DETAILED DESCRIPTION

[0036] 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.

[0037] like Figure 1 As shown, the magnetic liquid sealing device with supporting function according to the embodiment of the present invention comprises a housing 1 , a rotating shaft 2 , a micro-textured layer 22 , a pole piece assembly, a magnetic liquid 36 and a liquid-blocking coating 23 .

[0038] The shell 1 has an inner cavity, and the rotating shaft 2 is rotatably arranged in the inner cavity of the shell 1; the rotating shaft 2 is coaxially arranged with the shell 1. After the magnetic liquid sealing device is installed, when the rotating shaft 2 rotates relative to the shell 1, the magnetic liquid between the pole shoe assembly and the rotating shaft 2 can be used to form a seal to prevent the chambers at both ends of the inner cavity of the shell 1 from being connected to each other.

[0039] The micro-texture layer 22 is arranged in the circumference of at least a portion of the rotating shaft 2. The micro-texture layer 22 can adsorb the magnetic liquid arranged above it. For example, the micro-texture layer 22 has convex and concave morphological features. When the liquid is coated on its surface, it can adsorb, thereby increasing the contact force between the magnetic liquid and the wall surface and the strength of the magnetic chain bundles inside the magnetic liquid.

[0040] The micro-texture layer 22 can be directly or indirectly arranged on the circumferential surface of a partial section of the rotating shaft 2. For example, the micro-texture layer 22 is directly processed on the outer wall surface of the rotating shaft 2. For another example, a sleeve 21 can be sleeved on the outer wall surface of the rotating shaft 2, and the micro-texture layer 22 is processed on the outer wall surface of the sleeve 21.

[0041] The pole shoe assembly is connected to the housing 1, and the pole shoe assembly includes a first pole shoe 31, a second pole shoe 32 and a magnetic source 33. The first pole shoe 31 and the second pole shoe 32 are arranged at intervals along the circumference of the rotating shaft 2. The magnetic source 33 is located between the first pole shoe 31 and the second pole shoe 32. The first pole shoe 31 and the second pole shoe 32 both correspond to the micro-textured layer 22 in the radial direction of the rotating shaft 2, and there is a sealed gap 35 between the first pole shoe 31 and the micro-textured layer 22, and between the second pole shoe 32 and the micro-textured layer 22. The magnetic source 33 can be a permanent magnet or an electromagnet. The magnetic source 33 is connected with the first pole shoe 31 and the second pole shoe 32 to form a strong magnetic field at the sealing gap 35. The magnetic liquid is filled in the sealing gap 35 to form a magnetic liquid sealing ring. Under the action of the strong magnetic field, the magnetic liquid can be stably adsorbed at the sealing gap 35 to ensure the sealing performance; the liquid-blocking coating 23 is coated on the circumference of a part of the section of the rotating shaft 2 or the circumference of a part of the section of the micro-texture layer 22 to form a liquid-blocking ring. Liquid-blocking rings are provided on both sides of the magnetic liquid sealing ring to prevent the magnetic liquid from flowing along the axial direction of the rotating shaft 2. Optionally, the height of the liquid-blocking coating 23 in the radial direction of the rotating shaft 2 protrudes from the wall surface of the micro-texture layer 22 to prevent the magnetic liquid from moving along the axial direction of the rotating shaft 2.

[0042] It should be understood that when the shaft 2 deflects relative to the housing 1, the shaft 2 will squeeze the magnetic liquid on one side. If the shaft 2 is not supported, it is easy to cause the shaft 2 to collide with the pole shoe, and the lead seal will fail. Correspondingly, the space on the other side of the shaft 2 increases. If a gap occurs between the magnetic liquid and the shaft 2, leakage will occur. In the embodiment of the present invention, the contact force between the magnetic liquid and the micro-texture layer 22 can be increased by arranging the micro-texture layer 22, and the gap between the magnetic liquid and the shaft 2 can be avoided. At the same time, the liquid-blocking coating 23 can prevent the magnetic liquid from moving along the axis of the shaft 2, so that the magnetic liquid is always gathered in the sealing gap 35. When the shaft 2 deflects, the magnetic liquid is compressed, and the oil film bearing capacity of the magnetic liquid will increase accordingly. At the same time, due to the reduction of the gap distance, the magnetic field strength to which the magnetic liquid on the squeezed side is subjected will increase, which can further improve the oil film bearing capacity. Under the combined effect of the two, the magnetic liquid can play a sealing role while supporting the shaft 2.

[0043] The magnetic liquid sealing device of the embodiment of the present invention can suppress the axial movement of the magnetic liquid on the rotating shaft 2, so that the magnetic liquid is stably distributed in the sealing gap 35, and utilizes the magnetic liquid adsorbed in the sealing gap 35 to provide bearing capacity for the rotating shaft 2, improve the sealing performance, and support the rotating shaft 2, thereby improving the anti-sway ability of the rotating shaft 2.

[0044] A specific embodiment of the present invention is described in detail below.

[0045] The magnetic liquid sealing device with supporting function according to the embodiment of the present invention comprises a housing 1 , a rotating shaft 2 , a micro-textured layer 22 , a pole shoe assembly, a magnetic liquid and a liquid-blocking coating 23 .

[0046] The shell 1 has an inner cavity, and the rotating shaft 2 is rotatably arranged in the inner cavity of the shell 1; the rotating shaft 2 is coaxially arranged with the shell 1. After the magnetic liquid sealing device is installed, when the rotating shaft 2 rotates relative to the shell 1, the magnetic liquid between the pole shoe assembly and the rotating shaft 2 can be used to form a seal to prevent the chambers at both ends of the inner cavity of the shell 1 from being connected to each other.

[0047] The micro-texture layer 22 is arranged in the circumference of at least a portion of the rotating shaft 2. The rotating shaft 2 of the embodiment of the present invention is provided with a sleeve 21, the sleeve 21 is sleeved on the rotating shaft 2, and the micro-texture layer 22 is arranged on the sleeve 21. Specifically, the micro-texture layer 22 is constructed by processing the outer surface of a portion of the sleeve 21, and the micro-texture layer 22 is a convex and concave morphological feature formed on the outer wall surface of the sleeve 21.

[0048] Optionally, an annular groove 24 is provided on the outer wall of the sleeve 21 , an inner cavity of the annular groove 24 is embedded with an insert, the micro-textured layer 22 is embedded in the insert in the annular groove 24 , or the micro-textured layer 22 is directly embedded in the annular groove 24 as an insert.

[0049] The micro-texture layer 22 can adsorb the magnetic liquid arranged above it. For example, the micro-texture layer 22 has convex and concave morphology characteristics. When the liquid is coated on its surface, it can adsorb, thereby increasing the contact force between the magnetic liquid and the wall, and the strength of the magnetic chain bundles inside the magnetic liquid.

[0050] The micro-texture layer 22 can be directly or indirectly arranged on the circumferential surface of a partial section of the rotating shaft 2. For example, the micro-texture layer 22 is directly processed on the outer wall surface of the rotating shaft 2. For another example, a sleeve 21 can be sleeved on the outer wall surface of the rotating shaft 2, and the micro-texture layer 22 is processed on the outer wall surface of the sleeve 21.

[0051] like Figure 2-Figure 4 As shown, the micro-textured layer 22 is a plurality of grooves 221 formed on the outer wall of the sleeve 21, and the plurality of grooves are arranged in an array. The grooves may be rectangular grooves (e.g., square or long strips), or circular grooves. The depth, size, distance between adjacent grooves and other parameters of the grooves may be determined according to the effects in the actual application process. In application, when the shaft deviates laterally, the magnetic liquid in this embodiment may play a role similar to that of a sliding gear. The design of the micro-textured layer may improve the dynamic pressure effect of the magnetic liquid and the support effect.

[0052] The pole shoe assembly is connected to the shell 1, and the pole shoe assembly includes a first pole shoe 31, a second pole shoe 32 and a magnetic source 33. The first pole shoe 31 and the second pole shoe 32 are arranged at intervals along the circumference of the rotating shaft 2. The magnetic source 33 can be a permanent magnet or an electromagnet. The magnetic source 33 is located between the first pole shoe 31 and the second pole shoe 32. The first pole shoe 31 and the second pole shoe 32 both correspond to the micro-textured layer 22 in the radial direction of the rotating shaft 2.

[0053] The first pole shoe 31 and the second pole shoe 32 have a plurality of pole teeth 34 . The plurality of pole teeth 34 on the first pole shoe 31 and the plurality of pole teeth 34 on the second pole shoe 32 are arranged at intervals along the axial direction of the rotating shaft 2 . A sealing gap 35 is formed between each pole tooth 34 and the micro-textured layer 22 .

[0054] The magnetic source 33 is connected with the first pole shoe 31 and the second pole shoe 32 to form a strong magnetic field at the sealing gap 35. The magnetic liquid is filled in the sealing gap 35 to form a magnetic liquid sealing ring. Under the action of the strong magnetic field, the magnetic liquid can be stably adsorbed at the sealing gap 35 to ensure the sealing performance; the liquid-blocking coating 23 is coated on the circumference of a part of the section of the rotating shaft 2 or the circumference of a part of the section of the micro-texture layer 22 to form a liquid-blocking ring. Preferably, the liquid-blocking coating 23 is directly coated on the micro-texture layer 22. Liquid-blocking rings are provided on both sides of each magnetic liquid sealing ring to prevent the magnetic liquid from flowing along the axial direction of the rotating shaft 2. Optionally, the height of the liquid-blocking coating 23 in the radial direction of the rotating shaft 2 protrudes from the wall surface of the micro-texture layer 22 to prevent the magnetic liquid from moving along the axial direction of the rotating shaft 2.

[0055] Optionally, the liquid-resistant coating is selected from a material similar to the magnetic liquid-based carrier liquid component. For example, when a fully synthetic oil-based magnetic liquid is used, the liquid-resistant coating should be selected from a hydrocarbon material coating such as polyethylene; for another example, when a perfluoropolyether oil-based magnetic liquid is used, the liquid-resistant coating should be selected from a coating of a similar material such as polytetrafluoroethylene; for another example, when a silicone oil-based magnetic liquid is used, the liquid-resistant coating should be selected from silicone resin, alkyl silane, organically modified silicone coating, etc.

[0056] A cooling water trough 37 is provided on the first pole shoe 31 and the second pole shoe 32, and a water inlet 12 and a water outlet 13 corresponding to the cooling water trough 37 are provided on the shell 1. In practical applications, by introducing a cooling medium into the cooling water trough 37, the pole shoes can be cooled, thereby ensuring stable operation of the magnetic liquid sealing device and preventing the sealing effect from being affected by changes in ambient temperature.

[0057] During assembly, a seal 5 is provided between the first pole shoe 31 and the second pole shoe 32 and the inner wall of the shell 1 to ensure the seal between the pole shoe and the shell 1. Specifically, a sealing groove can be opened on the circumferential outer wall of the first pole shoe 31, and the seal 5 is an annular sealing ring, which is arranged in the sealing groove.

[0058] The housing 1 of the embodiment of the present invention is provided with end covers 6 at both ends, and the two end covers 6 are positioned by stoppers and connected to the axial ends of the housing 1 by bolts. A limiting boss 11 is provided at one end of the inner cavity, and a magnetic isolation ring 4 is provided between the limiting boss 11 and one of the first pole shoe 31 and the second pole shoe 32; a magnetic isolation ring 4 is also provided between the end cover 6 away from the limiting boss 11 and the other of the first pole shoe 31 and the second pole shoe 32. The magnetic isolation ring 4 can play a role of magnetic isolation on the one hand, and can fill the gap between the end cover 6 and the corresponding pole shoe through its axial length on the other hand, so as to ensure that the end cover 6 can be connected to the housing 1 so that the first pole shoe 31, the second pole shoe 32 and the magnetic source 33 can be tightly fixed together and fixed to the housing 1, so as to avoid sealing failure due to the movement of the pole shoes during operation.

[0059] In order to ensure the sealing performance of the overall structure, a sealing member 5 is also provided between the end cover 6 and the housing 1 .

[0060] The sealing member 5 in the above embodiment may be a rubber sealing ring or an oil seal.

[0061] When the shaft deflects relative to the housing, the shaft will squeeze the magnetic liquid on one side. If the shaft is not supported, it is easy to cause the shaft to collide with the pole shoe, and the lead seal will fail. Correspondingly, the space on the other side of the shaft increases. If a gap occurs between the magnetic liquid and the shaft, leakage will occur. In the embodiment of the present invention, the contact force between the magnetic liquid and the micro-texture layer can be increased by arranging the micro-texture layer, avoiding the occurrence of a gap between the magnetic liquid and the shaft. At the same time, the liquid-blocking coating can prevent the magnetic liquid from moving along the axis of the shaft, so that the magnetic liquid is always gathered in the sealing gap. When the shaft deflects, the magnetic liquid is compressed, and the oil film bearing capacity of the magnetic liquid will increase accordingly. At the same time, due to the reduction of the gap distance, the magnetic field strength to which the magnetic liquid on the squeezed side is subjected will increase, which can further improve the oil film bearing capacity. The combined effect of the two allows the magnetic liquid to play a sealing role while supporting the shaft.

[0062] The embodiment of the present invention improves the contact force between the magnetic liquid and the wall surface by processing a micro-texture layer on the surface of the sleeve, thereby inhibiting its axial movement. The axial movement of the magnetic liquid is further inhibited by processing a liquid-resistant coating area on the surface of the sleeve. The above method effectively ensures that when the shaft deflects, the magnetic liquid can be in the sealing gap. As the size of the sealing gap decreases due to the deflection, the magnetic field strength in the gap will continue to increase, and the oil film bearing capacity of the magnetic liquid in the sealing gap will also increase accordingly. At this time, the magnetic liquid seal plays a role similar to that of a sliding bearing. Not only does it not require a bearing for protection, but it can also play a role similar to that of a bearing.

[0063] The solution in the above embodiment makes it unnecessary to use auxiliary bearings for protection of the magnetic liquid seal, reduces the use restrictions of the magnetic liquid seal, and reduces the application restrictions of the magnetic liquid seal technology in aviation, aerospace, nuclear energy and other places where the space size is limited and auxiliary bearings cannot be installed or an additional high cost is required.

[0064] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0066] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] 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.

[0068] 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.

[0069] 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. A magnetic liquid sealing device with supporting function, characterized in that: include: a housing having an inner cavity; A rotating shaft, the rotating shaft being rotatably disposed in the inner cavity of the shell; A micro-textured layer, wherein the micro-textured layer is arranged in the circumference of at least a portion of the rotating shaft, A pole shoe assembly, the pole shoe assembly is connected to the housing, the pole shoe assembly comprises a first pole shoe, a second pole shoe and a magnetic source, the first pole shoe and the second pole shoe are arranged at intervals along the circumferential direction of the rotating shaft, the magnetic source is located between the first pole shoe and the second pole shoe, the first pole shoe and the second pole shoe both correspond to the micro-textured layer in the radial direction of the rotating shaft, and a sealed gap is provided between the first pole shoe and the micro-textured layer, and between the second pole shoe and the micro-textured layer; A magnetic liquid is filled in the sealing gap to form a magnetic liquid sealing ring; A liquid-blocking coating is coated on the circumference of a portion of the rotating shaft or the circumference of a portion of the micro-textured layer to form a liquid-blocking ring. The liquid-blocking ring is provided on both sides of the magnetic liquid sealing ring to prevent the magnetic liquid from flowing axially along the rotating shaft.

2. The magnetic liquid sealing device with supporting function according to claim 1, characterized in that: The first pole shoe and the second pole shoe have a plurality of pole teeth. The plurality of pole teeth on the first pole shoe and the plurality of pole teeth on the second pole shoe are arranged at intervals along the axial direction of the rotating shaft. The sealing gap is formed between each of the pole teeth and the micro-textured layer.

3. The magnetic liquid sealing device with supporting function according to claim 1, characterized in that: It also includes a sleeve, which is sleeved on the rotating shaft, and the micro-textured layer is arranged on the sleeve.

4. The magnetic liquid sealing device with supporting function according to claim 3, characterized in that: The micro-textured layer is formed by machining the outer surface of a partial section of the sleeve.

5. The magnetic liquid sealing device with supporting function according to claim 4, characterized in that: The micro-textured layer is a plurality of grooves opened on the outer wall surface of the sleeve.

6. The magnetic liquid sealing device with supporting function according to claim 3, characterized in that: An annular groove is arranged on the outer wall of the shaft sleeve, and the micro-texture layer is embedded in the annular groove.

7. The magnetic liquid sealing device with supporting function according to any one of claims 4 to 6, characterized in that: The dimension of the liquid-resistant coating in the radial direction of the rotating shaft protrudes beyond the micro-textured layer.

8. The magnetic liquid sealing device with supporting function according to claim 1, characterized in that: The first pole shoe and the second pole shoe are provided with cooling water grooves, and the housing is provided with a water inlet and a water outlet corresponding to the cooling water grooves; And / or, a seal is provided between the first pole shoe and the second pole shoe and the inner wall of the housing.

9. The magnetic liquid sealing device with supporting function according to claim 1, characterized in that: It also includes two end covers, which are respectively connected to the two axial ends of the shell.

10. The magnetic liquid sealing device with supporting function according to claim 9, characterized in that: A limiting boss is provided at one end of the inner cavity, and a magnetic isolation ring is provided between the limiting boss and one of the first pole shoe and the second pole shoe; a magnetic isolation ring is also provided between the end cover away from the limiting boss and the other of the first pole shoe and the second pole shoe; And / or, a seal is provided between the end cover and the housing.

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