Micro-nano magnetic medium sealing device with end face flow guide groove

Abstract

The application discloses a micro-nano magnetic medium sealing device with an end face flow guide groove, which comprises a shell, a rotating shaft and a micro-nano magnetic medium sealing assembly. The micro-nano magnetic medium sealing assembly comprises a magnetic conductive shaft sleeve, a low-pressure side pole shoe, a high-pressure side pole shoe and a magnet. A sealing gap for filling the micro-nano magnetic medium is arranged between the low-pressure side pole shoe and the first pole tooth and between the high-pressure side pole shoe and the second pole tooth. At least one of the low-pressure side pole shoe and the high-pressure side pole shoe is provided with a flow guide groove. When the magnetic conductive shaft sleeve rotates, the flow guide groove is used for providing the micro-nano magnetic medium with an acting force opposite to the pressure difference direction. The micro-nano magnetic medium can flow along the flow guide groove during the rotation, and the deviation of the micro-nano magnetic medium caused by the pressure difference and the centrifugal force is partially offset, so that the leakage of the micro-nano magnetic medium caused by the centrifugal force is reduced, the sealing performance is improved, and the requirement of a higher sealing medium pressure is met.

Description

Technical Field

[0001] This invention relates to the field of micro / nano magnetic media sealing technology, and more specifically to a micro / nano magnetic media sealing device with an end face guide groove. Background Technology

[0002] In micro / nano magnetic media sealing technology, micro / nano magnetic media form an "O" ring under the action of a non-uniform magnetic field, achieving a seal for the medium. This technology offers significant advantages such as zero leakage, long lifespan, and low friction, thus playing an irreplaceable role in high-end equipment such as aerospace and nuclear energy. However, in related technologies, micro / nano magnetic media seals need to withstand certain pressures. Under high-speed operating conditions, the micro / nano magnetic media is subjected to both the pressure difference across the pole shoes and centrifugal force. When the micro / nano magnetic media is thrown out of the sealing gap under centrifugal force, it will shift and flow towards the lower-pressure side of the pole shoes under the influence of the pressure difference, making it impossible to meet the high sealing medium pressure requirements. 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 micro / nano magnetic medium sealing device with end face guide grooves.

[0005] The micro / nano magnetic medium sealing device with end-face guide grooves according to an embodiment of the present invention includes a housing, a rotating shaft, and a micro / nano magnetic medium sealing assembly. The housing defines a chamber. At least a portion of the rotating shaft is rotatably disposed within the chamber. The micro / nano magnetic medium sealing assembly is disposed within the chamber and includes a magnetically conductive sleeve, a low-pressure side pole shoe, a high-pressure side pole shoe, and a magnet. The magnetically conductive sleeve is fitted onto the rotating shaft and has a first end face and a second end face opposite to each other along its axial direction. The first end face is provided with a first pole tooth, and the second end face is provided with a second pole tooth. The low-pressure side pole shoe and the high-pressure side pole shoe are fitted onto the rotating shaft and are rotatably disposed along the rotating shaft. The magnetic bushing is axially spaced on both sides. There are sealing gaps between the low-pressure side pole shoe and the first pole tooth, and between the high-pressure side pole shoe and the second pole tooth for filling the micro-nano magnetic medium. The magnet is located between the low-pressure side pole shoe and the high-pressure side pole shoe and outside the magnetic bushing. The magnet is spaced apart from the magnetic bushing. At least one of the end face of the low-pressure side pole shoe adjacent to the first pole tooth and the end face of the high-pressure side pole shoe adjacent to the second pole tooth is provided with a flow guide groove. When the magnetic bushing rotates, the flow guide groove is used to provide a force to the micro-nano magnetic medium opposite to the pressure difference direction.

[0006] In some embodiments, the guide groove on the low-pressure side pole shoe extends obliquely from the inside out in a direction opposite to the rotation direction of the rotating shaft, and the guide groove on the high-pressure side pole shoe extends obliquely from the inside out in a direction in the same direction as the rotation direction of the rotating shaft.

[0007] In some embodiments, the number of the flow channels is multiple, and the multiple flow channels are arranged at circumferential intervals along the low-pressure side pole shoe.

[0008] In some embodiments, the spacing between two adjacent guide channels gradually increases from the inside to the outside.

[0009] In some embodiments, the guide channel is an arc-shaped channel.

[0010] In some embodiments, the guide channel is a straight channel.

[0011] In some embodiments, the guide channel is a curved channel.

[0012] In some embodiments, the depth of the guide groove is H, and the size of the sealing gap is B, where H < B.

[0013] In some embodiments, 0.1mm ≤ B ≤ 1mm.

[0014] In some embodiments, the micro-nano magnetic medium sealing assembly has multiple components, which are spaced apart in the cavity along the axial direction of the rotating shaft. A rotating shaft sleeve is provided between two adjacent magnetic shaft sleeves, and the rotating shaft sleeve is sleeved on the rotating shaft with its two ends respectively abutting against the two rotating shaft sleeves.

[0015] The micro / nano magnetic medium sealing device with end-face guide grooves in this invention improves sealing performance and meets high sealing medium pressure requirements by preventing the micro / nano magnetic medium from being thrown out of the sealing gap under high-speed rotation through the design of the guide grooves. The guide grooves help the micro / nano magnetic medium form a stable sealing layer in the sealing gap, reducing the possibility of leakage and achieving a zero-leakage effect. Because the micro / nano magnetic medium can be better retained in the sealing gap, the decrease in sealing performance caused by leakage or loss of micro / nano magnetic medium is reduced, thereby extending the service life of the sealing device. This invention can adapt to pressure changes and centrifugal force effects under high-speed operating conditions, ensuring effective sealing even under extreme conditions. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the micro-nano magnetic medium sealing device according to an embodiment of the present invention.

[0017] Figure 2 yes Figure 1 An enlarged schematic diagram of part A in the middle.

[0018] Figure 3 yes Figure 1 Enlarged schematic diagram of part B.

[0019] Figure 4 This is a schematic diagram of a low-pressure side pole shoe according to an embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of a low-pressure side pole shoe according to an embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram of the low-pressure side pole shoe of another embodiment of the present invention.

[0022] Figure labels;

[0023] 100. Micro / nano magnetic medium sealing device; 1. Housing; 101. Chamber; 2. Rotating shaft; 3. Micro / nano magnetic medium sealing assembly; 301. Magnetic guide sleeve; 3011. First end face; 3012. Second end face; 3013. First pole tooth; 3014. Second pole tooth; 302. Low-pressure side pole shoe; 303. High-pressure side pole shoe; 304. Magnet; 4. Sealing gap; 5. Guide groove; 6. Rotating shaft sleeve. Detailed Implementation

[0024] 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.

[0025] like Figures 1 to 4 As shown, the micro / nano magnetic medium sealing device 100 with end face guide grooves according to an embodiment of the present invention includes a housing 1, a rotating shaft 2, and a micro / nano magnetic medium sealing assembly 3. The housing 1 defines a chamber 101, and at least a portion of the rotating shaft 2 is rotatably disposed within the chamber 101.

[0026] The micro-nano magnetic medium sealing assembly 3 is disposed in the chamber 101 and includes a magnetic bushing 301, a low-pressure side pole shoe 302, a high-pressure side pole shoe 303 and a magnet 304. The magnetic bushing 301 is fitted on the rotating shaft 2. The magnetic bushing 301 has a first end face 3011 and a second end face 3012 that are opposite to each other along its axial direction. The first end face 3011 is provided with a first pole tooth 3013 and the second end face 3012 is provided with a second pole tooth 3014.

[0027] The low-pressure side pole shoe 302 and the high-pressure side pole shoe 303 are sleeved on the rotating shaft 2 and spaced apart on both sides of the magnetic sleeve 301 along the axial direction of the rotating shaft 2. There is a sealing gap 4 between the low-pressure side pole shoe 302 and the first pole tooth 3013, and between the high-pressure side pole shoe 303 and the second pole tooth 3014 for filling micro-nano magnetic media.

[0028] Magnet 304 is disposed between low-pressure side pole shoe 302 and high-pressure side pole shoe 303 and located outside magnetic bushing 301. Magnet 304 is spaced apart from magnetic bushing 301. At least one of the end face of low-pressure side pole shoe 302 adjacent to the first pole tooth 3013 and the end face of high-pressure side pole shoe 303 adjacent to the second pole tooth 3014 is provided with a flow guide groove 5. When magnetic bushing 301 rotates, the flow guide groove 5 is used to provide a force opposite to the pressure difference direction to the micro-nano magnetic medium.

[0029] In use, the micro / nano magnetic medium sealing device 100 with end-face guide grooves of this invention forms a magnetic circuit between the magnetic bushing 301, the low-pressure side pole shoe 302, the high-pressure side pole shoe 303, and the magnet 304, so that the micro / nano magnetic medium is adsorbed into the sealing gap 4 under the action of the magnetic field, realizing the sealing effect of the rotating shaft 2 during rotation. The low-pressure side pole shoe 302 defines a low-pressure cavity between the magnetic bushing 301 and the rotating shaft 2, the high-pressure side pole shoe 303 defines a high-pressure cavity between the magnetic bushing 301 and the rotating shaft 2, and the medium-pressure cavity is defined between the magnetic bushing 301, the low-pressure side pole shoe 302, the high-pressure side pole shoe 303, and the magnet 304, wherein the pressure in the high-pressure cavity is greater than the pressure in the medium-pressure cavity, and the pressure in the medium-pressure cavity is greater than the pressure in the low-pressure cavity.

[0030] When the shaft 2 rotates at high speed, the micro-nano magnetic medium in the sealing gap 4 will be thrown into the medium-pressure chamber due to excessive centrifugal force. At the same time, under the action of pressure difference, the micro-nano magnetic medium will shift towards the low-pressure side pole shoe 302. However, since at least one of the end faces of the low-pressure side pole shoe 302 adjacent to the first pole tooth 3013 and the end faces of the high-pressure side pole shoe 303 adjacent to the second pole tooth 3014 is provided with a guide groove 5, the design of the guide groove 5 allows the micro-nano magnetic medium to flow along the guide groove 5 during rotation, which partially offsets the shift of the micro-nano magnetic medium caused by pressure difference and centrifugal force. This helps to maintain the stability of the micro-nano magnetic medium in the sealing gap 4, thereby reducing the loss of micro-nano magnetic medium due to centrifugal force.

[0031] Therefore, the micro / nano magnetic medium sealing device 100 with end-face guide grooves in this embodiment of the invention, through the design of the guide grooves 5, prevents the micro / nano magnetic medium from being thrown out of the sealing gap 4 under high-speed rotation, thereby improving sealing performance and meeting the high sealing medium pressure requirements. The guide grooves 5 help the micro / nano magnetic medium form a stable sealing layer in the sealing gap 4, reducing the possibility of leakage and achieving a zero-leakage effect. Because the micro / nano magnetic medium can be better retained in the sealing gap 4, the decrease in sealing performance caused by leakage or loss of the micro / nano magnetic medium is reduced, thereby extending the service life of the sealing device. This invention can adapt to pressure changes and centrifugal force effects under high-speed operating conditions, ensuring effective sealing even under extreme conditions.

[0032] In some embodiments, the guide groove 5 on the low-pressure side pole shoe 302 extends obliquely from the inside out and in the opposite direction to the rotation of the shaft 2, while the guide groove 5 on the high-pressure side pole shoe 303 extends obliquely from the inside out and in the same direction as the rotation of the shaft 2.

[0033] For example, such as Figure 3 As shown, the flow guide trough 5 extends inclined from the inside out and in the opposite direction to the rotation of the shaft 2. This design is because, during the rotation of the shaft 2, the micro / nano magnetic medium will move outward under the action of centrifugal force. The design of the flow guide trough 5 guides the micro / nano magnetic medium to flow inward, thus resisting the centrifugal force. The inclination of the flow guide trough 5 in the opposite direction to the rotation of the shaft 2 helps generate a force opposite to the centrifugal force during the flow of the micro / nano magnetic medium. This reduces the likelihood of the micro / nano magnetic medium being thrown out by centrifugal force, enhancing the sealing effect.

[0034] Similar to the guide groove 5 on the low-pressure side pole shoe 302, the guide groove 5 on the high-pressure side pole shoe 303 also extends inclined from the inside out. However, unlike the low-pressure side pole shoe 302, the guide groove 5 on the high-pressure side pole shoe 303 is inclined in the same direction as the rotation of the shaft 2. The reason for this is that on the high-pressure side, the micro-nano magnetic medium may move towards the low-pressure side due to the pressure difference. This design of the guide groove 5 helps to guide the flow of the micro-nano magnetic medium along the rotation direction of the shaft 2, thereby maintaining the amount of micro-nano magnetic medium in the sealing gap 4.

[0035] By controlling the directions of the guide channels 5 on the low-pressure and high-pressure sides respectively, the flow of the micro-nano magnetic medium in the sealing gap 4 can be better balanced, preventing a decrease in sealing performance caused by uneven flow. This design can better adapt to operating conditions with different speeds and pressures, ensuring good sealing performance under various working conditions. Due to the better sealing effect, the frequency of maintenance and replacement due to poor sealing can be reduced, thus lowering operating costs.

[0036] In some embodiments, there are multiple guide channels 5, and the multiple guide channels 5 are arranged at circumferential intervals along the low-pressure side pole shoe 302.

[0037] Multiple guide channels 5 can disperse the flow path of the micro / nano magnetic medium, avoiding liquid congestion or excessive flow caused by a single guide channel 5, thus making the flow of the micro / nano magnetic medium more uniform throughout the sealing area. The circumferentially spaced arrangement of the guide channels 5 helps to achieve a uniform pressure distribution of the micro / nano magnetic medium in the sealing gap 4, avoiding excessively high or low local pressure, thereby maintaining a stable sealing effect. Under high speed and changing operating conditions, multiple guide channels 5 can dynamically adjust the flow of the micro / nano magnetic medium to adapt to different working conditions and maintain good sealing performance.

[0038] In some embodiments, the distance between two adjacent guide channels 5 gradually increases from the inside to the outside.

[0039] The gradual increase in the spacing of the guide channels 5 allows for a gradual transition of the fluid, avoiding fluid dynamic losses or fluid congestion caused by sudden expansion or contraction of the flow cross-section. The increase in spacing from the inside to the outside also allows the flow velocity of the micro-nano magnetic medium in the sealing gap 4 to gradually decrease, helping to reduce turbulence and eddies caused by excessive flow velocity, thereby reducing energy loss.

[0040] Optionally, the guide channel 5 is an arc-shaped channel.

[0041] For example, such as Figure 4 As shown, the arc groove has a smooth curve, which can provide a smooth fluid flow path and reduce fluid turbulence and eddies. The arc shape helps to achieve uniform flow of micro-nano magnetic media in the sealing gap 4. The arc groove can reduce the impact of liquid on the groove wall during high-speed flow, reduce wear, and is suitable for sealing applications under various speed and pressure conditions.

[0042] Optionally, the guide channel 5 is a straight channel.

[0043] For example, such as Figure 5 As shown, the straight groove design is simple, easy to manufacture, and provides a direct fluid flow path.

[0044] Due to their simple design, straight channels have relatively low processing costs, low flow resistance which helps reduce energy loss, and are relatively easy to clean and maintain.

[0045] Optionally, the guide channel 5 is a curved channel.

[0046] For example, such as Figure 6 As shown, curved grooves can have complex geometries, such as spirals or wavy shapes, to achieve specific hydrodynamic effects. Curved grooves allow for better control of the flow direction and velocity of micro / nano magnetic media, adapting to specific sealing requirements. Optimized design of the curve shape can enhance sealing performance and reduce leakage. Curved grooves can adapt to complex operating conditions, such as high rotational speeds and high pressure differentials.

[0047] When selecting the shape of the guide channel 5, the following factors need to be considered:

[0048] Operating conditions: These include rotational speed, pressure difference, and temperature. Different operating conditions may require different shapes of guide channels 5. Sealing performance requirements: Based on the sealing performance requirements, select the shape of the guide channel 5 that provides the best sealing effect. Machining capabilities and cost: Considering the capability and cost of manufacturing the guide channel 5, select a shape that is easy to process and cost-effective. Maintenance and replacement: Considering the ease of maintenance and replacement of the guide channel 5, select a shape that is easy to operate and maintain.

[0049] In some embodiments, the depth of the guide groove 5 is H, and the size of the sealing gap 4 is B, where H < B.

[0050] The depth of the guide groove 5 is smaller than the size of the sealing gap 4, which can control the flow of the micro / nano magnetic medium in the sealing gap 4 to a certain extent, preventing the sealing performance from deteriorating due to excessive fluid flow. The flow characteristics of the micro / nano magnetic medium will vary under different rotational speeds and pressures. The smaller depth of the guide groove 5 helps to adapt to these changes and maintain a stable sealing effect.

[0051] Because the depth of the guide groove 5 is smaller than that of the sealing gap 4, the continuity and stability of the sealing film formed by the micro-nano magnetic medium in the sealing gap 4 will not be disrupted by the presence of the guide groove 5. The shallower guide groove 5 reduces the resistance to fluid flow, helps to reduce energy loss, and improves the operating efficiency of the sealing device.

[0052] Optionally, 0.1mm ≤ B ≤ 1mm.

[0053] In some embodiments, there are multiple micro-nano magnetic medium sealing components 3, which are spaced apart along the axial direction of the rotating shaft 2 in the chamber 101. A rotating shaft 2 sleeve is provided between two adjacent magnetic shaft sleeves 301. The rotating shaft 2 sleeve is sleeved on the rotating shaft 2 and its two ends are respectively abutted against the two rotating shaft 2 sleeves.

[0054] like Figure 1 As shown, the micro / nano magnetic medium sealing device 100 with end-face guide grooves of this invention can form multiple sealing areas at different positions of the rotating shaft 2 by setting multiple micro / nano magnetic medium sealing components 3, thereby enhancing the overall sealing effect, especially under high pressure differential and high-speed rotation conditions. Multiple sealing components provide redundancy; even if one or more components fail, the other components can still maintain a seal, thereby improving system reliability. The design of the multiple sealing components can be adjusted according to the length of the rotating shaft 2 and sealing requirements, making it suitable for applications of different sizes.

[0055] The rotating sleeve is fitted onto the rotating shaft 2, serving as a spacer between two adjacent micro / nano magnetic medium sealing assemblies 3. It not only maintains the spacing between the assemblies but also transmits force and torque. The two ends of the rotating sleeve abut against the two micro / nano magnetic medium sealing assemblies 3, respectively. This design ensures good positioning and fixation of the rotating sleeve in both the axial and radial directions.

[0056] Optionally, a housing 1 sleeve is provided between the two pole shoes in two adjacent micro-nano magnetic medium sealing assemblies 3. The housing 1 sleeve is sleeved on the rotating shaft 2 and its two ends are respectively abutted against the two adjacent pole shoes. The outer wall surface of the housing 1 sleeve is connected to the housing 1.

[0057] Optionally, the rotating shaft 2 is provided with an elastic retaining ring, which is used to stop the magnetic guide sleeve 301.

[0058] Optionally, one end of the housing 1 is provided with an end cap and an adjusting shim. The end cap is threadedly connected to the housing 1, and the end cap abuts against the pole shoe of the micro-nano magnetic medium sealing assembly 3 to seal the housing 1. The adjusting shim is provided between the end cap and the housing 1 to adjust the gap between the end cap and the housing 1.

[0059] Optionally, the low-pressure side shoe 302, the high-pressure side shoe 303, and the magnetic bushing 301 can be made of materials with good magnetic permeability, such as Cr or electrical pure iron. The magnet 304 can be made of neodymium iron boron. The housing 1 can be made of non-magnetic materials, such as stainless steel. The type of micro / nano magnetic medium is selected according to the different base liquids of the micro / nano magnetic mediums used in the application environment and the sealing medium, and no specific limitation is made here.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A micro / nano magnetic medium sealing device with end-face flow guide grooves, characterized in that, include: Housing, the housing defining an outlet chamber; A rotating shaft, at least a portion of which is rotatably disposed within the cavity; A micro / nano magnetic medium sealing assembly is disposed within a cavity and includes a magnetically conductive sleeve, a low-pressure side pole shoe, a high-pressure side pole shoe, and a magnet. The magnetically conductive sleeve is fitted onto a rotating shaft and has a first end face and a second end face opposite each other along its axial direction. The first end face has a first pole tooth, and the second end face has a second pole tooth. The low-pressure side pole shoe and the high-pressure side pole shoe are fitted onto the rotating shaft and are spaced apart on both sides of the magnetically conductive sleeve along the axial direction of the rotating shaft. The low-pressure side pole shoe and the first pole tooth... A sealing gap for filling micro-nano magnetic media is provided between the high-pressure side pole shoe and the second pole tooth. The magnet is located between the low-pressure side pole shoe and the high-pressure side pole shoe and outside the magnetic bushing. The magnet is spaced apart from the magnetic bushing. At least one of the end face of the low-pressure side pole shoe adjacent to the first pole tooth and the end face of the high-pressure side pole shoe adjacent to the second pole tooth is provided with a flow guide groove. When the magnetic bushing rotates, the flow guide groove is used to provide a force opposite to the pressure difference direction to the micro-nano magnetic media. The guide grooves on the low-pressure side pole shoe extend from the inside out and in a direction opposite to the rotation direction of the shaft. The guide grooves on the high-pressure side pole shoe extend from the inside out and in a direction in the same direction as the rotation direction of the shaft. There are multiple guide grooves, and the multiple guide grooves are arranged at circumferential intervals along the low-pressure side pole shoe.

2. The micro / nano magnetic medium sealing device with end-face guide groove according to claim 1, characterized in that, The distance between two adjacent guide channels gradually increases from the inside to the outside.

3. The micro / nano magnetic medium sealing device with end-face guide groove according to claim 1, characterized in that, The flow guide groove is a circular arc groove.

4. The micro / nano magnetic medium sealing device with end-face guide groove according to claim 1, characterized in that, The guide channel is a straight channel.

5. The micro / nano magnetic medium sealing device with end-face guide groove according to claim 1, characterized in that, The guide channel is a curved channel.

6. The micro / nano magnetic medium sealing device with end-face guide groove according to claim 1, characterized in that, The depth of the guide groove is H, and the size of the sealing gap is B, where H < B.

7. The micro / nano magnetic medium sealing device with end-face guide groove according to claim 6, characterized in that, 0.1mm≤B≤1mm.

8. The micro / nano magnetic medium sealing device with end-face guide groove according to claim 1, characterized in that, The micro-nano magnetic medium sealing assembly has multiple components, which are spaced apart in the cavity along the axial direction of the rotating shaft. A rotating shaft sleeve is provided between two adjacent magnetic shaft sleeves. The rotating shaft sleeve is sleeved on the rotating shaft and its two ends are respectively abutted against the two rotating shaft sleeves.

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