Magnetic fluid seal device with support

Abstract

The application discloses a magnetic liquid sealing device with supporting effect, which comprises a shell, a rotating shaft, a micro-textured layer, a pole shoe assembly, a magnetic liquid and a liquid blocking coating. The shell has an inner cavity. The rotating shaft is rotatably arranged in the inner cavity of the shell. The micro-textured layer is arranged on the circumference of at least a section of the rotating shaft. The pole shoe assembly is connected with the shell. The pole shoe assembly 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. The first pole shoe and the second pole shoe are both corresponding to the micro-textured layer in the radial direction of the rotating shaft. The first pole shoe and the micro-textured layer and the second pole shoe and the micro-textured layer both have sealing gaps. The magnetic liquid is filled in the sealing gaps to form a magnetic liquid sealing ring. The liquid blocking coating is coated on the circumference of the section of the rotating shaft or the circumference of the section of the micro-textured layer to form a liquid blocking ring. The magnetic liquid sealing ring is provided with the liquid blocking ring on both sides to prevent the magnetic liquid from flowing in the axial direction of the rotating shaft.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of sealing, and particularly relates to a magnetic liquid sealing device with supporting effect. BACKGROUND

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

[0003] In the related art, when the magnetic liquid sealing device is used, once the shaft is deflected, the shaft will often knock and wear the pole shoe and pole tooth, resulting in damage and failure of the sealing element. Therefore, during use, an auxiliary bearing is generally installed beside to avoid this situation. In many cases, such as aviation, aerospace, or occasions where the space size is limited, it is often impossible to install an auxiliary bearing or it is necessary to pay a high price. SUMMARY

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

[0005] To this end, an embodiment of the present application proposes a magnetic liquid sealing device with supporting effect capable of inhibiting the axial movement of the magnetic liquid on the shaft and improving the sealing performance.

[0006] The magnetic liquid sealing device with supporting effect of the embodiment of the present application comprises:

[0007] A housing having an inner cavity;

[0008] A shaft rotatably arranged in the inner cavity of the housing;

[0009] A micro-textured layer arranged in the circumferential direction of at least a part of the shaft,

[0010] A pole shoe assembly connected with the housing, the pole shoe assembly comprising a first pole shoe, a second pole shoe and a magnetic source, the first pole shoe and the second pole shoe being arranged at intervals along the circumferential direction of the shaft, the magnetic source being located between the first pole shoe and the second pole shoe, the first pole shoe and the second pole shoe both corresponding to the micro-textured layer in the radial direction of the shaft, and the first pole shoe and the micro-textured layer and the second pole shoe and the micro-textured layer both having a sealing gap therebetween;

[0011] A magnetic liquid 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. The magnetic liquid adsorbed in the sealing gap is used to provide bearing capacity for the rotating shaft, thereby improving the sealing performance, supporting the rotating shaft, and improving the anti-deflection capability 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 arranged between the end cover and the housing. BRIEF DESCRIPTION OF DRAWINGS

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

[0026] Figure 2 is a schematic view of a micro-textured layer according to an embodiment of the present application.

[0027] Figure 3 is a schematic view of a micro-textured layer according to another embodiment of the present application.

[0028] Figure 4 is a schematic view of a micro-textured layer according to yet another embodiment of the present application.

[0029] REFERENCE NUMERALS:

[0030] 1, housing; 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 tooth; 35, sealing gap; 36, magnetic liquid; 37, cooling water tank

[0033] 4, magnetic isolation ring;

[0034] 5, seal;

[0035] 6, end cover. DETAILED DESCRIPTION

[0036] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

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

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

[0039] The micro-textured layer 22 is arranged on the circumferential surface of at least a part of the rotating shaft 2, and the micro-textured layer 22 can adsorb the magnetic liquid arranged above the micro-textured layer 22, for example, the micro-textured layer 22 has a convex and concave topography, and when the liquid is coated on the surface of the micro-textured layer 22, the micro-textured layer 22 can adsorb the liquid, thereby improving the contact force between the magnetic liquid and the wall surface and the strength of the magnetic chain bundle inside the magnetic liquid.

[0040] The micro-textured layer 22 can be directly or indirectly arranged on the circumferential surface of the part of the rotating shaft 2, for example, the micro-textured layer 22 is directly machined on the outer wall surface of the rotating shaft 2, and for another example, a sleeve 21 can be sleeved on the outer wall surface of the rotating shaft 2, and the micro-textured layer 22 is machined on the outer wall surface of the sleeve 21.

[0041] The pole shoe assembly is connected with 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, and 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 are both opposite to the micro-textured layer 22 in the radial direction of the rotating shaft 2, and the first pole shoe 31 and the micro-textured layer 22 and the second pole shoe 32 and the micro-textured layer 22 both have a sealing gap 35. The magnetic source 33 can be a permanent magnet or an electromagnet, and 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, and 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 circumferential surface of the part of the rotating shaft 2 or the circumferential surface of the part of the micro-textured layer 22 to form a liquid-blocking ring, and the two sides of the magnetic liquid sealing ring are provided with the liquid-blocking rings to prevent the magnetic liquid from flowing along the axial direction of the rotating shaft 2. Optionally, the liquid-blocking coating 23 protrudes in the radial direction of the rotating shaft 2 from the wall surface of the micro-textured 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 rotating shaft 2 is deflected relative to the shell 1, the rotating shaft 2 will extrude the magnetic liquid on one side, and if the rotating shaft 2 is not supported, the rotating shaft 2 will be easily knocked against the pole shoe, and the lead sealing will fail. Correspondingly, the space on the other side of the rotating shaft 2 is increased, and if a gap occurs between the magnetic liquid and the rotating shaft 2, leakage will occur. In the embodiment of the present application, the contact force between the magnetic liquid and the micro-textured layer 22 can be increased by arranging the micro-textured layer 22, so as to avoid the gap between the magnetic liquid and the rotating shaft 2, and the liquid-blocking coating 23 can prevent the magnetic liquid from moving along the axis of the rotating shaft 2, so that the magnetic liquid is always gathered in the sealing gap 35. When the rotating shaft 2 is deflected, the magnetic liquid is extruded, and the oil film carrying capacity of the magnetic liquid will increase accordingly. At the same time, due to the decrease of the gap distance, the magnetic field strength of the magnetic liquid on the side that is extruded will increase, which can further improve the oil film carrying capacity. Under the combined action of the two, the magnetic liquid can not only play a sealing role, but also support the rotating shaft 2.

[0043] The magnetic liquid sealing device of the embodiment of the present application can inhibit 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 the magnetic liquid absorbed in the sealing gap 35 is used to provide carrying capacity for the rotating shaft 2, improve the sealing performance, and realize the support for the rotating shaft 2, and improve the anti-deflection ability of the rotating shaft 2.

[0044] The following will be described in detail with respect to one specific embodiment of the present application.

[0045] The magnetic liquid sealing device with supporting function of the embodiment of the present application comprises a shell 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 and the shell 1 are coaxially arranged, and 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 communicated with each other.

[0047] The micro-textured layer 22 is arranged in the circumferential direction of at least a part of the rotating shaft 2, and the rotating shaft 2 of the embodiment of the present application is provided with a shaft sleeve 21, the shaft sleeve 21 is sleeved on the rotating shaft 2, and the micro-textured layer 22 is arranged on the shaft sleeve 21. Specifically, the micro-textured layer 22 is configured to be machined on the outer surface of a part of the shaft sleeve 21, and the micro-textured layer 22 is a convex-concave topography feature formed on the outer wall surface of the shaft sleeve 21.

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

[0049] The micro-textured layer 22 can adsorb the magnetic liquid arranged above it, for example, the micro-textured layer 22 has a convex-concave topography feature, which can play an adsorption role when the liquid is coated on its surface, thereby improving the contact force between the magnetic liquid and the wall surface and the strength of the magnetic chain bundle inside the magnetic liquid.

[0050] The micro-textured layer 22 can be directly or indirectly arranged on the circumferential surface of the part of the shaft 2, for example, the micro-textured layer 22 is directly machined on the outer wall surface of the shaft 2, or for example, a shaft sleeve 21 can be sleeved on the outer wall surface of the shaft 2, and the micro-textured layer 22 is machined on the outer wall surface of the shaft sleeve 21.

[0051] As shown in Figures 2-4 The micro-textured layer 22 is a plurality of grooves 221 opened on the outer wall surface of the shaft sleeve 21, and the plurality of grooves are arranged in an array. The grooves can be rectangular grooves (such as square or long strip-shaped), or the grooves can be circular grooves. The depth, size, and distance between adjacent grooves can be determined according to the effect in actual application. In application, when the shaft deviates, the magnetic liquid in the embodiment can play a role similar to a sliding gear, and the design of the micro-textured layer can improve the dynamic pressure effect of the magnetic liquid and improve the supporting effect.

[0052] The pole shoe assembly is connected with 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 along the circumference of the shaft 2. The magnetic source 33 can be a permanent magnet or an electromagnet, and 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 are both corresponding to the micro-textured layer 22 in the radial direction of the 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 along the axial direction of the shaft 2. Each pole tooth 34 forms a sealed gap 35 with the micro-textured layer 22.

[0054] The magnetic source 33 is connected with the first pole shoe 31 and the second pole shoe 32, so that a strong magnetic field is formed 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, so that the sealing performance is guaranteed; the liquid blocking coating 23 is coated on the circumference of part of the shaft 2 or the circumference of part of the micro-textured layer 22 to form a liquid blocking ring, preferably, the liquid blocking coating 23 is directly coated on the micro-textured layer 22. The two sides of each magnetic liquid sealing ring are provided with the liquid blocking ring to prevent the magnetic liquid from flowing along the axial direction of the shaft 2. Alternatively, the liquid blocking coating 23 protrudes from the wall surface of the micro-textured layer 22 in the radial direction of the shaft 2, so as to prevent the magnetic liquid from moving along the axial direction of the shaft 2.

[0055] Alternatively, the liquid blocking coating is selected from a material similar to the base liquid of the magnetic liquid, for example, when the full synthetic oil-based magnetic liquid is used, the liquid blocking coating should be selected from a carbon-hydrogen material coating such as polyethylene; for another example, when the perfluoropolyether oil-based magnetic liquid is used, the liquid blocking coating should be selected from a coating of similar material such as polytetrafluoroethylene; for another example, when the silicon oil-based magnetic liquid is used, the liquid blocking coating should be selected from a coating of silicon resin, alkylsilane, organically modified silicon, and the like.

[0056] The first pole shoe 31 and the second pole shoe 32 are provided with cooling water grooves 37, the housing 1 is provided with a water inlet 12 and a water outlet 13 corresponding to the cooling water grooves 37, in actual application, by introducing a cooling medium into the cooling water grooves 37, the cooling effect of the pole shoes can be achieved, so that the magnetic liquid sealing device can work stably, and the sealing effect can be prevented from being affected by the change of the environmental temperature.

[0057] During assembly, the first pole shoe 31 and the second pole shoe 32 are both provided with the sealing element 5 between the inner wall of the housing 1, so as to guarantee the sealing between the pole shoes and the housing 1, specifically, a sealing groove can be formed on the circumferential outer wall of the first pole shoe 31, and the sealing element 5 is an annular sealing ring, which is arranged in the sealing groove.

[0058] Both ends of the housing 1 of the embodiment are provided with end covers 6, the two end covers 6 are positioned by a stop opening and connected to the axial two ends of the housing 1 by bolts. One end of the inner cavity is provided with a limiting boss 11, and a magnetic isolation ring 4 is arranged between the limiting boss 11 and one of the first pole shoe 31 and the second pole shoe 32; the end cover 6 away from the limiting boss 11 is also provided with a magnetic isolation ring 4 between the other one of the first pole shoe 31 and the second pole shoe 32, the magnetic isolation ring 4 can play a role in magnetic isolation on one hand, and on the other hand, the length dimension in the axial direction of the magnetic isolation ring 4 can fill the gap between the end cover 6 and the corresponding pole shoe, so that after the end cover 6 is connected to the housing 1, the first pole shoe 31, the second pole shoe 32 and the magnetic source 33 can be tightly fixed together and fixed with the housing 1, and the sealing failure caused by the pole shoe movement during operation can be avoided.

[0059] In order to guarantee the sealing performance of the whole structure, a sealing member 5 is arranged between the end cover 6 and the shell 1.

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

[0061] When the rotating shaft is deflected relative to the shell, the rotating shaft will extrude the magnetic liquid on one side, and if the rotating shaft is not supported, the rotating shaft will be easily knocked against the pole shoe, and the lead sealing will fail. Correspondingly, the space on the other side of the rotating shaft is increased, and if a gap occurs between the magnetic liquid and the rotating shaft, leakage will occur. In the embodiment of the application, the arrangement of the micro-textured layer can increase the contact force between the magnetic liquid and the micro-textured layer, avoid the gap between the magnetic liquid and the rotating shaft, and the liquid-blocking coating can prevent the magnetic liquid from moving along the axis of the rotating shaft, so that the magnetic liquid is always gathered in the sealing gap. When the rotating shaft is deflected, the magnetic liquid is extruded, and the oil film carrying capacity of the magnetic liquid will increase. At the same time, due to the reduced gap distance, the magnetic field strength of the magnetic liquid on the side that is extruded will increase, which can further improve the oil film carrying capacity. Under the combined action of the two, the magnetic liquid can not only play a sealing role, but also support the rotating shaft.

[0062] The embodiment of the application improves the contact force between the magnetic liquid and the wall surface by processing a micro-textured layer on the surface of the shaft sleeve, and inhibits the axial movement of the magnetic liquid. The axial movement of the magnetic liquid is further inhibited by processing a liquid-blocking coating area on the surface of the shaft sleeve. The above-mentioned method effectively ensures that the magnetic liquid can be in the sealing gap when the rotating shaft is deflected. As the deflection causes the size of the sealing gap to decrease, the magnetic field strength in the gap will continuously increase, and the oil film carrying capacity of the magnetic liquid in the sealing gap will also increase. At this time, the magnetic liquid sealing plays a similar effect to a sliding bearing, which not only does not need a bearing for protection, but also can play a similar effect to a bearing.

[0063] The scheme in the above embodiment makes the magnetic liquid sealing not need to be protected by an auxiliary bearing, reduces the use restrictions of the magnetic liquid sealing, and reduces the application restrictions of the magnetic liquid sealing technology in the fields of aviation, aerospace, nuclear energy and the like where the space size is limited and auxiliary bearings cannot be installed or additional high costs are required.

[0064] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated thereby must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0065] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated thereby. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0066] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0067] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be 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, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or it can only mean that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or it can only mean that the horizontal height of the first feature is less than that of the second feature.

[0068] In this disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present disclosure. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the terminology "comprising" is used in the disclosure as comprising but not limited to, that is, it is open-ended and does not exclude the presence of additional features, structures, materials, or characteristics.

[0069] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above-described embodiments are exemplary, and are not to be interpreted as limiting the present disclosure, and the ordinary skilled in the art can make changes, modifications, replacements, and variations to the above-described embodiments within the scope of the present disclosure.

Claims

1. A magnetic liquid sealing device with a supporting function, characterized in that: include: a housing having an inner cavity; a rotating shaft rotatably disposed in the inner cavity of the shell; a micro-textured layer, the micro-textured layer being provided in the circumference of at least a portion of the rotating shaft, a pole shoe assembly connected to the housing, comprising a first pole shoe, a second pole shoe, and a magnetic source, wherein the first pole shoe and the second pole shoe are spaced apart along the circumference 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 defined between the first pole shoe and the micro-textured layer, and between the second pole shoe and the micro-textured layer; Magnetic liquid, the magnetic liquid is filled in the sealing gap to form a magnetic liquid sealing ring; A liquid-blocking coating is applied to 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. The material of the liquid-blocking coating is any one of polyethylene, polytetrafluoroethylene, silicone resin, and alkyl silane.

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: The invention also includes a shaft sleeve, which is sleeved on the rotating shaft, and the micro-textured layer is arranged on the shaft 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-texture 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 provided 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: A dimension of the liquid-resistant coating in a radial direction of the rotating shaft protrudes beyond that of 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 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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