Micro-nano magnetic medium sealing device with end face diversion trenches

Abstract

The micro-nano magnetic medium sealing device comprises a shell, a rotating shaft and a micro-nano magnetic medium sealing assembly, and the micro-nano magnetic medium sealing assembly comprises a magnetic conduction shaft sleeve, a low-pressure side pole shoe, a high-pressure side pole shoe and a magnet. Sealing gaps used for being filled with micro-nano magnetic media are formed between the low-pressure side pole shoe and the first pole teeth and between the high-pressure side pole shoe and the second pole teeth, and at least one of the low-pressure side pole shoe and the high-pressure side pole shoe is provided with a flow guide groove. And the diversion trench is used for providing an acting force opposite to the pressure difference direction for the micro-nano magnetic medium. According to the invention, the micro-nano magnetic medium can flow along the flow guide grooves in the rotating process, and the deviation of the micro-nano magnetic medium caused by pressure difference and centrifugal force is partially offset, so that the condition of loss of the micro-nano magnetic medium caused by the centrifugal force is reduced, the sealing performance is improved, and the higher sealing medium pressure requirement is met.

Description

Technical Field

[0001] The present invention relates to the technical field of micro-nano magnetic medium sealing, and in particular to a micro-nano magnetic medium sealing device with an end face guide groove. Background Art

[0002] In micro-nano magnetic medium sealing technology, micro-nano magnetic medium forms an "O" ring under the action of an uneven magnetic field to achieve sealing of the medium. It has significant advantages such as zero leakage, long life and low friction. Therefore, it plays an irreplaceable role in high-end equipment such as aerospace and nuclear energy. In related technologies, micro-nano magnetic medium seals need to withstand a certain pressure. Under high-speed conditions, micro-nano magnetic media are affected by centrifugal force in addition to the pressure difference on both sides of the pole shoe. When the micro-nano magnetic medium is thrown out of the sealing gap under the action of centrifugal force, it will flow toward the pole shoe on the low-pressure side under the action of the pressure difference, resulting in the inability to meet the higher sealing medium pressure requirements. Summary of the invention

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

[0004] To this end, an embodiment of the present invention provides a micro-nano magnetic medium sealing device with an end surface guide groove.

[0005] The micro-nano magnetic medium sealing device with end face guide grooves of the embodiment of the present invention comprises a shell, a rotating shaft and a micro-nano magnetic medium sealing assembly, wherein the shell defines a chamber; at least a portion of the rotating shaft is rotatably arranged in the chamber; the micro-nano magnetic medium sealing assembly is arranged in the chamber and comprises a magnetic sleeve, a low-pressure side pole shoe, a high-pressure side pole shoe and a magnet, the magnetic sleeve is sleeved on the rotating shaft, the magnetic sleeve 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, 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 sleeved on the rotating shaft and along the rotating shaft The axial spacing on the magnetic sleeve is arranged on both sides of the magnetic sleeve, and there is a sealing gap between the low-voltage side pole shoe and the first pole tooth, and between the high-voltage side pole shoe and the second pole tooth for filling the micro-nano magnetic medium. The magnet is arranged between the low-voltage side pole shoe and the high-voltage side pole shoe and is located on the outside of the magnetic sleeve. The magnet and the magnetic sleeve are spaced apart. A guide groove is provided on at least one of the end surface of the low-voltage side pole shoe adjacent to the first pole tooth and the end surface of the high-voltage side pole shoe adjacent to the second pole tooth. When the magnetic sleeve rotates, the guide groove is used to provide a force opposite to the pressure difference direction to the micro-nano magnetic medium.

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

[0007] In some embodiments, there are multiple guide grooves, and the multiple guide grooves are arranged at intervals along the circumference of the low-pressure side pole shoe.

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

[0009] In some embodiments, the guide groove is an arc groove.

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

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

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

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

[0014] In some embodiments, there are multiple micro-nano magnetic medium sealing assemblies, and the multiple micro-nano magnetic medium sealing assemblies are arranged in the chamber 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 and its two ends are respectively stopped on the two rotating shaft sleeves.

[0015] The micro-nano magnetic medium sealing device with end face guide grooves in the embodiment of the present invention has a design of guide grooves, so that the micro-nano magnetic medium is not easily thrown out of the sealing gap under high-speed rotation, thereby improving the sealing performance and meeting the higher sealing medium pressure requirements. The guide groove helps the micro-nano magnetic medium to form a stable sealing layer in the sealing gap, reducing the possibility of leakage and achieving a zero leakage effect. Since the micro-nano magnetic medium can be better maintained in the sealing gap, the decline 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. The present invention can adapt to pressure changes and centrifugal force under high-speed working conditions, ensuring that effective sealing can still be provided under extreme conditions. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 2 yes Figure 1 Enlarged schematic diagram of part A.

[0018] Figure 3 yes Figure 1 Schematic diagram of the enlarged portion B.

[0019] Figure 4 Schematic diagram of a low-voltage side pole shoe according to an embodiment of the present invention.

[0020] Figure 5 Schematic diagram of a low-voltage side pole shoe according to an embodiment of the present invention.

[0021] Figure 6 It is a schematic diagram of a low-voltage side pole shoe according to yet another embodiment of the present invention.

[0022] Reference numerals;

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

[0024] 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.

[0025] like Figures 1 to 4 As shown, the micro-nano magnetic medium sealing device 100 with end face guide grooves according to the embodiment of the present invention comprises 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 in the chamber 101.

[0026] The micro-nano magnetic medium sealing assembly 3 is arranged in the chamber 101 and includes a magnetic sleeve 301, a low-voltage side pole shoe 302, a high-voltage side pole shoe 303 and a magnet 304. The magnetic sleeve 301 is sleeved on the rotating shaft 2. The magnetic sleeve 301 has a first end face 3011 and a second end face 3012 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-voltage side pole shoe 302 and the high-voltage side pole shoe 303 are sleeved on the rotating shaft 2 and are arranged on both sides of the magnetic sleeve 301 along the axial direction of the rotating shaft 2. There is a sealing gap 4 for filling micro-nano magnetic medium between the low-voltage side pole shoe 302 and the first pole tooth 3013 and between the high-voltage side pole shoe 303 and the second pole tooth 3014.

[0028] The magnet 304 is arranged between the low-voltage side pole shoe 302 and the high-voltage side pole shoe 303 and is located on the outside of the magnetic sleeve 301. The magnet 304 and the magnetic sleeve 301 are spaced apart. A guide groove 5 is provided on at least one of the end surface of the low-voltage side pole shoe 302 adjacent to the first pole tooth 3013 and the end surface of the high-voltage side pole shoe 303 adjacent to the second pole tooth 3014. When the magnetic sleeve 301 rotates, the guide groove 5 is used to provide a force to the micro-nano magnetic medium in the opposite direction of the pressure difference.

[0029] When the micro-nano magnetic medium sealing device 100 with end face guide grooves of the embodiment of the present invention is in use, a magnetic circuit is formed between the magnetic sleeve 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 in the sealing gap 4 under the action of the magnetic field, and the sealing effect of the rotating shaft 2 during the rotation process is realized. A low-pressure cavity is defined between the low-pressure side pole shoe 302, the magnetic sleeve 301 and the rotating shaft 2, a high-pressure cavity is defined between the high-pressure side pole shoe 303, the magnetic sleeve 301 and the rotating shaft 2, and a medium-pressure cavity is defined between the magnetic sleeve 301, the low-pressure side pole shoe 302, the high-pressure side pole shoe 303 and the magnet 304, wherein the pressure of the high-pressure cavity is greater than the pressure of the medium-pressure cavity, and the pressure of the medium-pressure cavity is greater than the pressure of the low-pressure cavity.

[0030] When the rotating shaft 2 is running 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, and at the same time, under the action of the pressure difference, the micro-nano magnetic medium will deviate toward the low-pressure side pole shoe 302. However, since at least one of the end surface of the low-pressure side pole shoe 302 adjacent to the first pole tooth 3013 and the end surface 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 the rotation process, partially offsetting the deviation of the micro-nano magnetic medium caused by the pressure difference and centrifugal force, helping to maintain the stability of the micro-nano magnetic medium in the sealing gap 4, thereby reducing the loss of the micro-nano magnetic medium due to centrifugal force.

[0031] Therefore, the micro-nano magnetic medium sealing device 100 with end face guide grooves in the embodiment of the present invention is designed with the guide groove 5, so that the micro-nano magnetic medium is not easily thrown out of the sealing gap 4 under high-speed rotation, thereby improving the sealing performance and meeting the higher sealing medium pressure requirements. The guide groove 5 helps the micro-nano magnetic medium to form a stable sealing layer in the sealing gap 4, reducing the possibility of leakage and achieving a zero leakage effect. Since the micro-nano magnetic medium can be better retained in the sealing gap 4, the reduction in sealing performance due to leakage or loss of the micro-nano magnetic medium is reduced, thereby extending the service life of the sealing device. The present invention can adapt to the pressure changes and centrifugal force under high-speed working conditions, ensuring that effective sealing can still be provided under extreme conditions.

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

[0033] For example, Figure 3 As shown, the guide groove 5 extends obliquely from the inside to the outside, and is inclined in the direction opposite to the rotation direction of the shaft 2. The reason for this design is that during the rotation of the shaft 2, the micro-nano magnetic medium will move outward under the action of centrifugal force, and this design of the guide groove 5 can guide the micro-nano magnetic medium to flow inward, thereby resisting the action of centrifugal force. The guide groove 5 is inclined in the direction opposite to the rotation direction of the shaft 2, which helps to generate a force in the opposite direction of the centrifugal force when the micro-nano magnetic medium flows, which can reduce the situation where the micro-nano magnetic medium is thrown out due to the centrifugal force and enhance 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 obliquely from the inside to the outside. 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 direction of the shaft 2. The reason for this is that on the high-pressure side, the micro-nano magnetic medium may move to the low-pressure side due to the pressure difference. This design of the guide groove 5 helps to guide the micro-nano magnetic medium to flow 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 direction of the guide groove 5 on the low-pressure side and the high-pressure side respectively, the flow of the micro-nano magnetic medium in the sealing gap 4 can be better balanced to prevent the degradation of the sealing performance due to uneven flow. This design can better adapt to the working conditions of different speeds and pressure conditions, ensuring that good sealing performance can be maintained under various working conditions. Due to the better sealing effect, the maintenance and replacement frequency caused by poor sealing can be reduced, reducing the operating cost.

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

[0037] Multiple guide grooves 5 can disperse the flow path of the micro-nano magnetic medium, avoid liquid congestion or too fast flow caused by a single guide groove 5, and make the flow of the micro-nano magnetic medium in the entire sealing area more uniform. The circumferential spacing of the guide grooves 5 helps to achieve a uniform distribution of the pressure of the micro-nano magnetic medium in the sealing gap 4, avoid local pressure being too high or too low, and thus maintain a stable sealing effect. Under high speed and changing working conditions, multiple guide grooves 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 grooves 5 gradually increases from the inside to the outside.

[0039] The gradual increase in the spacing of the guide grooves 5 can achieve a gradual transition of the fluid, avoiding fluid power loss or fluid congestion caused by a sudden expansion or reduction of the flow cross section. The increase in the spacing from the inside to the outside can also gradually reduce the flow velocity of the micro-nano magnetic medium in the sealing gap 4, which helps to reduce turbulence and eddy currents caused by excessive flow velocity, thereby reducing energy loss.

[0040] Optionally, the guide groove 5 is an arc groove.

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

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

[0043] For example, Figure 5 As shown, the linear groove is simple in design, easy to process, and has a direct fluid flow path.

[0044] Due to its simple design, the processing cost of the linear groove is relatively low, the flow resistance of the linear groove is small, which helps to reduce energy loss, and the cleaning and maintenance of the linear groove are relatively simple.

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

[0046] For example, Figure 6 As shown, the curved groove can be a complex geometric shape, such as a spiral or wavy shape, to achieve a specific fluid dynamics effect. The curved groove can better control the flow direction and speed of the micro-nano magnetic medium and adapt to specific sealing requirements. The sealing effect can be enhanced and leakage can be reduced by optimizing the design of the curved shape. The curved groove can adapt to complex working conditions, such as high speed and high pressure difference.

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

[0048] Working conditions: including speed, pressure difference, temperature, etc. Different working conditions may require different shapes of guide grooves 5. Sealing performance requirements: According to the requirements for sealing performance, select the shape of the guide groove 5 that can provide the best sealing effect. Processing capacity and cost: Consider the ability and cost of manufacturing the guide groove 5, and select a shape that is easy to process and cost-effective. Maintenance and replacement: Consider the convenience of maintenance and replacement of the guide groove 5, and 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, wherein 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, and prevent the sealing performance from being reduced due to the excessive flow of the fluid. Under different rotation speed and pressure conditions, the flow characteristics of the micro-nano magnetic medium will be different. The smaller depth of the guide groove 5 helps to adapt to these changes and maintain a stable sealing effect.

[0051] Since the depth of the guide groove 5 is less than the sealing gap 4, when the micro-nano magnetic medium forms a sealing film in the sealing gap 4, the continuity and stability of the sealing film will not be destroyed due to the presence of the guide groove 5. The shallower guide groove 5 reduces the resistance of the 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 assemblies 3, and the multiple micro-nano magnetic medium sealing assemblies 3 are arranged in the chamber 101 along the axial direction of the rotating shaft 2. A rotating shaft 2 sleeve is provided between two adjacent magnetic conductive shaft sleeves 301. The rotating shaft 2 sleeve is sleeved on the rotating shaft 2 and the two ends are respectively stopped on 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 the embodiment of the present 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 the working conditions of high pressure difference and high-speed rotation. Multiple sealing components can provide redundancy. Even if one or several components fail, the other components can still maintain sealing, thereby improving the reliability of the system. The design of multiple sealing components can be adjusted according to the length of the rotating shaft 2 and the sealing requirements, and is suitable for applications of different sizes.

[0055] The shaft sleeve is sleeved on the shaft 2 as a spacer between two adjacent micro-nano magnetic medium sealing components 3. It can not only maintain the interval between the components, but also transmit force and torque. The two ends of the shaft sleeve are respectively stopped on the two micro-nano magnetic medium sealing components 3. This design can ensure that the shaft sleeve is well positioned and fixed in both the axial and radial directions.

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

[0057] Optionally, an elastic retaining ring is provided on the rotating shaft 2 , and the elastic retaining ring is used to stop the magnetic conductive sleeve 301 .

[0058] Optionally, an end cap and an adjusting gasket are provided at one end of the housing 1, 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 gasket 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-voltage side pole shoe 302, the high-voltage side pole shoe 303 and the magnetic sleeve 301 can be made of materials with good magnetic conductivity, such as Cr, electrical pure iron, etc. The magnet 304 can be made of neodymium iron boron, etc. The housing 1 can be made of non-magnetic conductive materials, such as L stainless steel, etc. The type of micro-nano magnetic medium is selected according to the use environment and the sealing medium. The micro-nano magnetic medium with different base carrier liquids is not specifically limited here.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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 micro-nano magnetic medium sealing device with end face guide grooves, characterized in that: include: a housing defining a chamber; a rotating shaft, at least a portion of which is rotatably disposed in the chamber; A micro-nano magnetic medium sealing component, wherein the micro-nano magnetic medium sealing component is arranged in the chamber and comprises a magnetic sleeve, a low-pressure side pole shoe, a high-pressure side pole shoe and a magnet, wherein the magnetic sleeve is sleeved on the rotating shaft, wherein the magnetic sleeve has a first end face and a second end face opposite to each other along its axial direction, wherein a first pole tooth is arranged on the first end face, and a second pole tooth is arranged on the second end face, wherein the low-pressure side pole shoe and the high-pressure side pole shoe are sleeved on the rotating shaft and are arranged on both sides of the magnetic sleeve at intervals along the axial direction of the rotating shaft, wherein the low-pressure side pole shoe and the first pole tooth are spaced apart from each other. There is a sealed gap between the high-voltage side pole shoe and the second pole tooth for filling micro-nano magnetic medium, the magnet is arranged between the low-voltage side pole shoe and the high-voltage side pole shoe and is located on the outside of the magnetic sleeve, the magnet and the magnetic sleeve are spaced apart, and a guide groove is provided on at least one of the end surface of the low-voltage side pole shoe adjacent to the first pole tooth and the end surface of the high-voltage side pole shoe adjacent to the second pole tooth. When the magnetic sleeve rotates, the guide groove is used to provide a force opposite to the pressure difference direction to the micro-nano magnetic medium.

2. The micro-nano magnetic medium sealing device with end surface guide groove according to claim 1, characterized in that: The guide groove on the low-pressure side pole shoe extends obliquely from inside to outside and 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 inside to outside and in a direction same as the rotation direction of the rotating shaft.

3. The micro-nano magnetic medium sealing device with end surface guide groove according to claim 2, characterized in that: There are multiple guide grooves, and the multiple guide grooves are arranged at intervals along the circumferential direction of the low-pressure side pole shoe.

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

5. The micro-nano magnetic medium sealing device with end surface guide grooves according to claim 2, characterized in that: The guide groove is a circular arc groove.

6. The micro-nano magnetic medium sealing device with end surface guide grooves according to claim 2, characterized in that: The guide groove is a straight groove.

7. The micro-nano magnetic medium sealing device with end face guide groove according to claim 2, characterized in that: The guide groove is a curved groove.

8. The micro-nano magnetic medium sealing device with end surface guide grooves according to claim 2, characterized in that: The depth of the guide groove is H, and the size of the sealing gap is B, wherein H<B.

9. The micro-nano magnetic medium sealing device with end surface guide grooves according to claim 2, characterized in that: 0.1mm≤B≤1mm.

10. The micro-nano magnetic medium sealing device with end surface guide grooves according to claim 1, characterized in that: The micro-nano magnetic medium sealing components are multiple, and the multiple micro-nano magnetic medium sealing components are arranged in the chamber 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 stopped on the two rotating shaft sleeves.

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