Bearingless radial micro / nano magnetic medium sealing device and its assembly method

Abstract

This invention discloses a bearingless radial micro / nano magnetic medium sealing device and its assembly method. The bearingless radial micro / nano magnetic medium sealing device includes a housing, a bushing, a rotating shaft, a micro / nano magnetic medium sealing assembly, and a calibration plate. The bushing is rotatably disposed within the housing, with one end extending out of the end cap. When the calibration plate abuts against the calibration surface parallel to the bearing, the width of the first sealing gap is equal to the width of the second sealing gap. When the rotating shaft operates at high speed, this invention can adapt to the frequent radial runout of the shaft, reducing the bearing life reduction caused by runout and improving the reliability of the sealing system. By adjusting the widths of the first and second sealing gaps through the calibration plate, the widths of the two gaps are made equal, ensuring the uniformity and stability of the micro / nano magnetic medium seal, thereby enhancing the pressure resistance of the seal and extending the service life of the coolant pump equipped with the micro / nano magnetic medium sealing device of this invention.

Description

Technical Field

[0001] This invention relates to the field of bearingless radial micro / nano magnetic medium sealing device technology, specifically to a bearingless radial micro / nano magnetic medium sealing device and its assembly method. Background Technology

[0002] Micro-nano magnetic media seals utilize non-uniform magnetic fields to confine micro-nano magnetic media, preventing leakage and offering the advantage of "zero leakage." However, in the operation of coolant pumps using bearingless radial micro-nano magnetic media seal devices, frequent radial runout occurs. Due to the presence of bearings in traditional axial micro-nano magnetic media seals, this runout reduces bearing life, leading to decreased reliability. In related technologies, bearingless radial micro-nano magnetic media seals can meet the operating environment requirements of coolant pumps and similar applications, offering higher reliability and durability. However, in the bearingless state, traditional axial micro-nano magnetic media seal assemblies cannot achieve uniformity in the tooth gap of radial micro-nano magnetic media seals, significantly impacting the pressure resistance and service life of the seal. 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 bearingless radial micro / nano magnetic medium sealing device and its assembly method.

[0005] The bearingless radial micro / nano magnetic medium sealing device of this invention includes a housing, a bushing, a rotating shaft, a micro / nano magnetic medium sealing assembly, and a calibration plate. The housing includes a housing body and an end cap. The bushing is rotatably disposed inside the housing and one end extends out of the end cap. The rotating shaft passes through the bushing. The outer side wall of the end cap has a calibration surface perpendicular to the bushing.

[0006] The micro / nano magnetic medium sealing assembly is disposed within the housing and includes a first pole shoe, a second pole shoe, a permanent magnet, and a sealing sleeve. The first pole shoe and the second pole shoe are spaced apart on the bushing along the axial direction and connected to the housing. The permanent magnet is disposed between the first pole shoe and the second pole shoe. The sealing sleeve is fitted on the bushing and has a first pole tooth and a second pole tooth that are opposite each other along the axial direction of the bushing. The first pole tooth and the second pole tooth are disposed between the first pole shoe and the second pole shoe and define a first sealing gap and a second sealing gap with the first pole shoe and the second pole shoe, respectively.

[0007] The calibration plate is located on the outside of the housing, adjacent to the end cover, and is perpendicularly connected to the bushing. When the calibration plate is parallel to and abuts against the calibration surface, the width of the first sealing gap is equal to the width of the second sealing gap.

[0008] In some embodiments, the calibration plate has a through hole for the calibration bolt to pass through, and the calibration surface has a threaded hole. The calibration bolt is connected to the threaded hole to adjust the gap between the calibration plate and the calibration surface.

[0009] In some embodiments, a calibration slot is provided on the outer circumferential surface of the bushing. The calibration slot is located outside the housing and on the side near the end cover. One end of the calibration plate is fitted into the calibration slot.

[0010] In some embodiments, the number of calibration plates is at least three, and the at least three calibration plates are arranged at circumferential intervals along the bushing.

[0011] In some embodiments, a first groove and a second groove are provided on the outer peripheral surface of the bushing. The first groove and the second groove are spaced apart in the housing along the axial direction of the bushing. A first retaining spring is provided on the first groove, and a second retaining spring is provided on the second groove. The first retaining spring and the second retaining spring are provided on both sides of the sealing sleeve to fix the position of the sealing sleeve in the axial direction of the bushing.

[0012] In some embodiments, a positioning hole is provided on the side wall of the bushing for a positioning screw to pass through. The positioning hole is located outside the housing. The positioning screw is connected to the positioning hole and the top end of the positioning screw abuts against the rotating shaft.

[0013] In some embodiments, there are multiple first pole teeth, which are arranged radially spaced along the bushing; and there are multiple second pole teeth, which are arranged radially spaced along the bushing.

[0014] In some embodiments, a first sealing groove is formed on the outer peripheral surface of the first pole shoe, a first sealing ring is provided in the first sealing groove and the outer peripheral surface of the first sealing ring is in contact with the inner peripheral surface of the housing, and a second sealing groove is formed on the outer peripheral surface of the second pole shoe, a second sealing ring is provided in the second sealing groove and the outer peripheral surface of the second sealing ring is in contact with the inner peripheral surface of the housing.

[0015] In some embodiments, a third sealing groove is provided on the inner circumferential surface of the bushing, a third sealing ring is provided in the third sealing groove and the inner circumferential surface of the third sealing ring is in contact with the outer circumferential surface of the rotating shaft, and a fourth sealing groove is provided on the inner circumferential surface of the sealing sleeve, a fourth sealing ring is provided in the fourth sealing groove and the inner circumferential surface of the fourth sealing ring is in contact with the outer circumferential surface of the bushing.

[0016] The assembly method of the bearingless radial micro / nano magnetic medium sealing device according to an embodiment of the present invention includes the following steps:

[0017] Step 1: Fix the first pole shoe at a preset position inside the shell body;

[0018] Step 2: Install the permanent magnet into the shell body and abut it against the first pole shoe in the axial direction of the bushing;

[0019] Step 3: Securely fit the sealing sleeve onto the preset position of the bushing;

[0020] Step 4: Insert the sealing sleeve and the shaft sleeve assembled in Step 4 into the housing body, so that a first sealing gap is formed between the first pole shoe and the first pole tooth, and the two ends of the shaft sleeve extend out of the housing body;

[0021] Step 5: Fix the second pole shoe in a preset position inside the housing body and abut it against the permanent magnet in the axial direction of the bushing, so that a second sealing gap is formed between the second pole shoe and the second pole tooth;

[0022] Step Six: Secure the end cap to the shell body;

[0023] Step 7: Fix the calibration plate at a preset position on the bushing, push the calibration plate along the axial direction of the bushing, and make the calibration plate parallel to the calibration surface, so that the width of the first sealing gap is the same as that of the second sealing gap.

[0024] The bearingless radial micro / nano magnetic medium sealing device and its assembly method of this invention achieve radial sealing of the micro / nano magnetic medium on the bushing by means of the first and second sealing gaps. Therefore, no additional bearing support is required within the micro / nano magnetic medium sealing device to support the rotating shaft. When the shaft rotates at high speed, the bearingless radial micro / nano magnetic medium sealing device can adapt to the frequent radial runout of the shaft, reducing the bearing life reduction caused by runout and thus improving the reliability of the sealing system. By adjusting the widths of the first and second sealing gaps with a calibration plate to ensure that the two gap widths are equal, the uniformity and stability of the micro / nano magnetic medium seal are guaranteed, thereby enhancing the pressure resistance of the seal. Due to the improved sealing effect, media leakage is reduced, thereby extending the service life of the coolant pump equipped with the micro / nano magnetic medium sealing device of this invention. Attached Figure Description

[0025] Figure 1 This is a schematic diagram showing the different widths of the first and second sealing gaps after assembly of the bearingless radial micro / nano magnetic medium sealing device according to an embodiment of the present invention.

[0026] Figure 2 yes Figure 1 An enlarged schematic diagram of part A in the middle.

[0027] Figure 3 yes Figure 1 Enlarged schematic diagram of part B.

[0028] Figure 4 This is a schematic diagram showing the state where the widths of the first sealing gap and the second sealing gap are the same after the assembly of the bearingless radial micro / nano magnetic medium sealing device according to an embodiment of the present invention.

[0029] Figure 5 yes Figure 4 An enlarged schematic diagram of section C.

[0030] Figure 6 yes Figure 4 An enlarged schematic diagram of part D in the middle.

[0031] Figure 7 This is a schematic diagram of the installation of the bearingless radial micro / nano magnetic medium sealing device connected to the coolant pump according to an embodiment of the present invention.

[0032] Figure label:

[0033] 100. Micro / nano magnetic medium sealing device; 1. Rotating shaft; 2. Housing; 201. Housing body; 203. End cap; 2031. Calibration surface; 2032. Threaded hole; 3. Bushing; 301. Calibration slot; 302. Positioning hole; 4. Micro / nano magnetic medium sealing assembly; 401. First pole shoe; 402. Second pole shoe; 403. Permanent magnet; 404. Sealing sleeve; 405. First pole tooth; 406. Second pole tooth; 5. First sealing gap; 6. Second sealing gap; 7. Calibration plate; 701. Perforation; 8. Calibration bolt; 9. First snap ring; 10. Second snap ring; 11. Positioning screw; 12. First sealing ring; 13. Second sealing ring; 14. Third sealing ring; 15. Fourth sealing ring. Detailed Implementation

[0034] 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.

[0035] like Figures 1 to 7 As shown, the bearingless radial micro / nano magnetic medium sealing device 100 of this embodiment includes a housing 2, a bushing 3, a rotating shaft 1, a micro / nano magnetic medium sealing assembly 4, and a calibration plate 7. The housing 2 includes a housing body 201 and an end cap 203. The bushing 3 is rotatably disposed inside the housing 1 and one end extends out of the end cap 203. The rotating shaft 1 passes through the bushing 3. The outer side wall of the end cap 203 has a calibration surface 2031 perpendicular to the bushing 3.

[0036] The micro / nano magnetic medium sealing assembly 4 is disposed within the housing 2 and includes a first pole shoe 401, a second pole shoe 402, a permanent magnet 403, and a sealing sleeve 404. The first pole shoe 401 and the second pole shoe 402 are spaced apart on the bushing 3 along the axial direction and connected to the housing 2. The permanent magnet 403 is disposed between the first pole shoe 401 and the second pole shoe 402. The sealing sleeve 404 is fitted onto the bushing 3 and has a first pole tooth 405 and a second pole tooth 406 that are opposite each other along the axial direction of the bushing 3. The first pole tooth 405 and the second pole tooth 406 are disposed between the first pole shoe 401 and the second pole shoe 402 and define a first sealing gap 5 and a second sealing gap 6 with the first pole shoe 401 and the second pole shoe 402, respectively.

[0037] The calibration plate 7 is located on the side of the housing 2 adjacent to the end cover 203 and is perpendicularly connected to the bushing 3. When the calibration plate 7 is parallel to the calibration surface 2031, the width of the first sealing gap 5 is equal to the width of the second sealing gap 6.

[0038] In use, the bearingless radial micro / nano magnetic medium sealing device 100 of this invention forms a magnetic circuit between the first pole shoe 401, the second pole shoe 402, the permanent magnet 403, and the sealing sleeve 404. Under the action of the non-uniform magnetic field generated by the permanent magnet 403, a certain amount of micro / nano magnetic medium is magnetically attracted within the first sealing gap 5 and the second sealing gap 6, forming a liquid sealing ring. The magnetic medium reaches equilibrium under the pressure and magnetic force of the sealed medium, thereby maintaining the sealing effect and achieving radial sealing.

[0039] Since the first sealing gap 5 and the second sealing gap 6 achieve a radial magnetic seal on the bushing 3, no additional bearing support is required for the rotating shaft 1 within the micro / nano magnetic medium sealing device 100. When the rotating shaft 1 is operating at high speed, the bearingless radial micro / nano magnetic medium sealing device 100 can adapt to the frequent radial runout of the rotating shaft 1, reducing the problem of reduced bearing life caused by runout, thereby improving the reliability of the sealing system.

[0040] The widths of the first sealing gap 5 and the second sealing gap 6 are adjusted by the calibration plate 7 to ensure that the widths of the two gaps are equal, thus guaranteeing the uniformity and stability of the micro-nano magnetic media seal and enhancing the pressure resistance of the seal. Because the sealing effect is improved, media leakage is reduced, thereby extending the service life of the coolant pump with the bearingless radial micro-nano magnetic media sealing device 100.

[0041] In some embodiments, the calibration plate 7 has a through hole 701 for the calibration bolt 8 to pass through, and the calibration surface 2031 has a threaded hole 2032. The calibration bolt 8 is connected to the threaded hole 2032 to adjust the gap between the calibration plate 7 and the calibration surface 2031.

[0042] like Figure 2 and Figure 3 As shown, after the micro / nano magnetic medium sealing assembly 4 and the bushing 3 are installed, without calibration, the width between the first sealing gap 5 and the second sealing gap 6 is uneven, and there is also a gap between the calibration plate 7 and the calibration surface 2031. When adjusting the first sealing gap 5 and the second sealing gap 6, the operator can rotate the calibration bolt 8. When rotating the calibration bolt 8, because the calibration bolt 8 is connected to the threaded hole 2032 on the calibration surface 2031, the axial movement of the bolt is restricted, and it can only move along the axial direction of the calibration bolt 8. By pushing the calibration plate 7 with the calibration bolt 8, the size of the gap between the calibration plate 7 and the calibration surface 2031 is adjusted.

[0043] This structure allows for precise adjustment of the calibration plate 7, ensuring that the widths of the first sealing gap 5 and the second sealing gap 6 are equal, thus improving the uniformity and effectiveness of the seal. The adjustable calibration bolt 8 simplifies the adjustment process, eliminating the need for complex tools or procedures.

[0044] In some embodiments, a calibration slot 301 is provided on the outer peripheral surface of the bushing 3. The calibration slot 301 is located outside the housing 2 and on one side near the end cover 203. One end of the calibration plate 7 is fitted into the calibration slot 301.

[0045] When the position of calibration plate 7 needs to be adjusted, the operator can easily insert or remove one end of calibration plate 7 into or remove it from the calibration slot 301 of bushing 3. After calibration plate 7 is secured in calibration slot 301, the gap between calibration plate 7 and calibration surface 2031 can be adjusted by rotating calibration bolt 8, thereby achieving precise control of the sealing gap of micro-nano magnetic media. Since the connection between calibration plate 7 and bushing 3 is slot-type, calibration plate 7 will not easily shift during calibration, maintaining the stability of gap adjustment. The design of calibration slot 301 simplifies the installation process of calibration plate 7, eliminating the need for complex fixing structures; simply insert calibration plate 7 into the slot. The slot structure provides a stable support for calibration plate 7, ensuring that the position of calibration plate 7 will not shift during adjustment.

[0046] In some embodiments, the number of calibration plates 7 is at least three, and the at least three calibration plates 7 are arranged at circumferential intervals along the bushing 3.

[0047] The number of calibration plates 7 is at least three, ensuring that there are calibration plates 7 for gap adjustment throughout the entire circumference. At least three calibration plates 7 are arranged at circumferential intervals along the bushing 3, i.e., they are evenly distributed on the circumference of the bushing 3. Each calibration plate 7 has its own corresponding calibration slot 301 and calibration bolt 8.

[0048] Each calibration plate 7 is adjusted simultaneously, allowing the operator to uniformly adjust the gap along the entire circumference of the bushing 3, avoiding the problem of localized over-tightness or over-looseness that might occur with a single calibration plate 7. Multiple calibration plates 7 provide more support points, helping to maintain the stability of the calibration plates 7 during adjustment, thereby maintaining the uniformity of the gap.

[0049] In some embodiments, a first groove and a second groove are provided on the outer peripheral surface of the bushing 3, and the first groove and the second groove are spaced apart along the axial direction of the bushing 3 within the housing 2. A first retaining spring 9 is provided on the first groove, and a second retaining spring 10 is provided on the second groove. The first retaining spring 9 and the second retaining spring 10 are provided on both sides of the sealing sleeve 404 to fix the position of the sealing sleeve 404 in the axial direction of the bushing 3.

[0050] like Figure 1 , Figure 4 and Figure 7As shown, when the sealing sleeve 404 is installed on the bushing 3, the retaining rings on both sides lock it in a specific axial position by elastic force. During the operation of the bearingless radial micro / nano magnetic medium sealing device 100, component displacement may occur due to vibration, temperature changes, etc. The use of retaining rings can prevent the axial displacement of the sealing sleeve 404 and maintain its positional stability. By fixing the position of the sealing sleeve 404, the stability of the micro / nano magnetic medium sealing gap can be ensured, thereby maintaining a stable sealing effect during long-term operation.

[0051] The snap ring structure provides additional axial fixation, enhancing the stability of the sealing sleeve 404 and thus ensuring the reliability of the seal. Stabilizing the position of the sealing sleeve 404 helps maintain a uniform sealing gap, reducing the risk of leakage. Due to the stable position of the sealing sleeve 404, wear and damage caused by displacement are reduced, thereby extending the service life of the sealing system. The snap ring structure is typically designed for easy disassembly and replacement, facilitating maintenance and repair.

[0052] In some embodiments, a positioning hole 302 is provided on the side wall of the bushing 3 for the positioning screw 11 to pass through. The positioning hole 302 is located outside the housing 2. The positioning screw 11 is connected to the positioning hole 302 and the top end of the positioning screw 11 abuts against the rotating shaft 1.

[0053] like Figure 1 , Figure 4 and Figure 7 As shown, tightening the positioning screw 11 ensures a precise relative position between the bushing 3 and the rotating shaft 1, preventing axial or circumferential displacement of the bushing 3. The use of the positioning screw 11 increases the stability between the bushing 3 and the rotating shaft 1, preventing relative displacement due to vibration or other factors during operation. A stable position of the bushing 3 helps maintain the uniformity of the sealing gap and the reliability of the micro / nano magnetic medium seal, reducing the possibility of leakage. The design of the positioning hole 302 and the positioning screw 11 simplifies the installation process of the bushing 3, providing a quick and precise installation method.

[0054] In some embodiments, there are multiple first pole teeth 405, which are arranged at radial intervals along the bushing 3, and there are multiple second pole teeth 406, which are arranged at radial intervals along the bushing 3.

[0055] like Figure 3 and Figure 6 As shown, there are multiple first pole teeth 405 and multiple second pole teeth 406. These pole teeth are designed to form a sealing gap with the corresponding pole shoes to accommodate micro-nano magnetic media and achieve a sealing effect. Therefore, multiple sealing barriers can be formed in the radial direction to improve the radial sealing effect.

[0056] In some embodiments, a first sealing groove is formed on the outer peripheral surface of the first pole shoe 401, and a first sealing ring 12 is provided in the first sealing groove, with the outer peripheral surface of the first sealing ring 12 fitting against the inner peripheral surface of the housing 2. A second sealing groove is formed on the outer peripheral surface of the second pole shoe 402, and a second sealing ring 13 is provided in the second sealing groove, with the outer peripheral surface of the second sealing ring 13 fitting against the inner peripheral surface of the housing 2.

[0057] like Figure 1 , Figure 4 and Figure 7 As shown, a first sealing groove is formed on the outer peripheral surface of the first pole shoe 401, and a second sealing groove is formed on the outer peripheral surface of the second pole shoe 402. These sealing grooves are typically designed as annular grooves to facilitate the installation of sealing rings. A first sealing ring 12 is provided in the first sealing groove, and a second sealing ring 13 is provided in the second sealing groove. These sealing rings are typically made of elastic materials, such as rubber or silicone, which can provide good sealing performance. The outer peripheral surfaces of the first sealing ring 12 and the second sealing ring 13 are designed to fit against the inner peripheral surface of the housing 2. In this way, when the pole shoe is installed in the housing 2, the sealing ring can tightly fill the gap between the pole shoe and the housing 2.

[0058] The sealing ring provides an additional layer of seal, further preventing media leakage through the gap between the pole shoe and housing 2. Because the sealing ring is typically elastic, it compensates for any minute gaps that may exist between the pole shoe and housing 2, thus providing a better seal. The fit between the outer circumferential surface of the sealing ring and the inner circumferential surface of housing 2 helps maintain the stability of the pole shoe within housing 2, preventing relative displacement.

[0059] In some embodiments, a third sealing groove is formed on the inner circumferential surface of the bushing 3, and a third sealing ring 14 is provided in the third sealing groove, with the inner circumferential surface of the third sealing ring 14 fitting against the outer circumferential surface of the rotating shaft 1. A fourth sealing groove is formed on the inner circumferential surface of the sealing sleeve 404, and a fourth sealing ring 15 is provided in the fourth sealing groove, with the inner circumferential surface of the fourth sealing ring 15 fitting against the outer circumferential surface of the bushing 3.

[0060] like Figure 1 , Figure 4 and Figure 7 As shown, the third sealing ring 14 and the fourth sealing ring 15 are located at the sealing interfaces between the bushing 3 and the rotating shaft 1, and between the sealing sleeve 404 and the bushing 3, respectively. As additional sealing layers, they help improve the sealing performance of the system. Because the sealing rings are elastic, they can fill and compensate for the minute gaps between the bushing 3 and the rotating shaft 1, and between the sealing sleeve 404 and the bushing 3, thereby preventing media leakage. The sealing rings fit tightly against the outer circumferential surfaces of the bushing 3 and the rotating shaft 1, helping to maintain the axial and circumferential stability of the bushing 3 and the sealing sleeve 404.

[0061] By adding an extra sealing ring, the system's sealing performance is significantly improved, effectively reducing the possibility of media leakage. The addition of the sealing ring provides extra safety for the sealing system, enhancing its overall reliability.

[0062] The present invention also discloses an assembly method for a bearingless radial micro / nano magnetic medium sealing device 100, comprising the following steps:

[0063] Step 1: Fix the first pole shoe 401 in a preset position inside the shell body 201;

[0064] Specifically, before installing the first pole shoe 401, the first sealing ring 12 is installed in the first sealing groove of the first pole shoe 401.

[0065] Step 2: Install the permanent magnet 403 into the housing body 201 and abut it against the first pole shoe 401 in the axial direction of the bushing 3;

[0066] Step 3: Securely mount the sealing sleeve 404 onto the preset position of the bushing 3;

[0067] Specifically, before the sealing sleeve 404 is fixedly fitted onto the bushing 3, the fourth sealing ring 15 is installed in the fourth sealing groove of the sealing sleeve 404. After the sealing sleeve 404 is fitted onto the bushing 3, a first retaining ring 9 and a second retaining ring 10 are provided on the sealing sleeve 404 to achieve axial positioning of the sealing sleeve 404 on the bushing 3.

[0068] Step 4: Insert the sealing sleeve 404 and bushing 3 assembled in Step 4 into the housing body 201, so that a first sealing gap 5 is formed between the first pole shoe 401 and the first pole tooth 405, and the two ends of the bushing 3 extend out of the housing body 201.

[0069] Step 5: Fix the second pole shoe 402 in a preset position inside the housing body 201 and abut it against the permanent magnet 403 in the axial direction of the bushing 3, so that a second sealing gap 6 is formed between the second pole shoe 402 and the second pole tooth 406.

[0070] Specifically, before installing the second pole shoe 402, the second sealing ring 13 is installed in the second sealing groove of the second pole shoe 402, and then the second pole shoe 402 is fixed in a preset position inside the shell body 201.

[0071] Step 6: Secure the end cap 203 to the shell body 201;

[0072] For example, the end cap 203 is connected to the shell body 201 by bolts.

[0073] Step 7: Fix the calibration plate 7 in the preset position of the bushing 3, push the calibration plate 7 along the axial direction of the bushing 3, and make the calibration plate 7 parallel to the calibration surface 2031 so that the width of the first sealing gap 5 and the second sealing gap 6 are the same.

[0074] Specifically, the operator can adjust the gap between the calibration plate 7 and the calibration surface 2031 by rotating the calibration bolt 8. This adjustment is achieved because the calibration bolt 8 is connected to the threaded hole 2032 on the calibration surface 2031, restricting its axial movement to the axial direction of the bolt. The calibration bolt 8 then pushes the calibration plate 7, thereby adjusting the gap between the calibration plate 7 and the calibration surface 2031. Finally, as... Figure 7 As shown, the housing body 201 is connected to the housing of the equipment to be sealed, and the positioning screws 11 are tightened to fix the relative position between the bushing 3 and the rotating shaft 1, preventing the bushing 3 from shifting in the axial or circumferential direction. After the rotating shaft 1 is installed, the calibration plate 7 can be removed.

[0075] The assembly method of the bearingless radial micro / nano magnetic medium sealing device 100 of the present invention adjusts the width of the first sealing gap 5 and the second sealing gap 6 by means of a calibration plate 7, so that the widths of the two gaps are equal, ensuring the uniformity and stability of the micro / nano magnetic medium seal, thereby enhancing the pressure resistance of the seal. Because the sealing effect is improved, media leakage is reduced, thus extending the service life of the micro / nano magnetic medium sealing device 100.

[0076] Optionally, there are multiple micro-nano magnetic medium sealing components 4, which are arranged at intervals along the axial direction of the bushing 3. A spacer is provided between two adjacent micro-nano magnetic medium sealing components 4, and the spacer is sleeved on the bushing 3 with its two ends respectively abutting against the two adjacent micro-nano magnetic medium sealing components 4.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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 bearingless radial micro / nano magnetic medium sealing device, characterized in that, include: A housing, the housing comprising a housing body and end caps; A bushing and a rotating shaft, wherein the bushing is rotatably disposed within the housing and one end extends out of the end cover, the rotating shaft passes through the bushing, and the outer side wall of the end cover has a calibration surface perpendicular to the bushing; A micro / nano magnetic medium sealing assembly is disposed within a housing and includes a first pole shoe, a second pole shoe, a permanent magnet, and a sealing sleeve. The first pole shoe and the second pole shoe are spaced apart on the bushing along the axial direction and connected to the housing. The permanent magnet is disposed between the first pole shoe and the second pole shoe. The sealing sleeve is fitted on the bushing and has a first pole tooth and a second pole tooth that are opposite each other along the axial direction of the bushing. The first pole tooth and the second pole tooth are disposed between the first pole shoe and the second pole shoe and define a first sealing gap and a second sealing gap with the first pole shoe and the second pole shoe, respectively. A calibration plate is disposed on the outside of the housing, adjacent to the end cover, and perpendicularly connected to the bushing. When the calibration plate is parallel to and abuts against the calibration surface, the width of the first sealing gap is equal to the width of the second sealing gap. The calibration plate has a through hole for the calibration bolt to pass through, and the calibration surface has a threaded hole. The calibration bolt is connected to the threaded hole to adjust the gap between the calibration plate and the calibration surface. A calibration slot is provided on the outer circumferential surface of the bushing. The calibration slot is located outside the housing and on the side near the end cover. One end of the calibration plate is fitted into the calibration slot. The number of calibration plates is at least three, and the at least three calibration plates are arranged at circumferential intervals along the bushing.

2. The bearingless radial micro / nano magnetic medium sealing device according to claim 1, characterized in that, The outer circumferential surface of the bushing is provided with a first groove and a second groove. The first groove and the second groove are spaced apart in the housing along the axial direction of the bushing. A first retaining spring is provided on the first groove and a second retaining spring is provided on the second groove. The first retaining spring and the second retaining spring are provided on both sides of the sealing sleeve to fix the position of the sealing sleeve in the axial direction of the bushing.

3. The bearingless radial micro / nano magnetic medium sealing device according to claim 1, characterized in that, The bushing has a positioning hole on its side wall for the positioning screw to pass through. The positioning hole is located outside the housing. The positioning screw is connected to the positioning hole and the top of the positioning screw abuts against the rotating shaft.

4. The bearingless radial micro / nano magnetic medium sealing device according to claim 1, characterized in that, The number of first pole teeth is multiple, and the multiple first pole teeth are arranged radially spaced along the bushing. The number of second pole teeth is also multiple, and the multiple second pole teeth are arranged radially spaced along the bushing.

5. The bearingless radial micro / nano magnetic medium sealing device according to claim 1, characterized in that, A first sealing groove is formed on the outer peripheral surface of the first pole shoe, and a first sealing ring is provided in the first sealing groove, with the outer peripheral surface of the first sealing ring fitting against the inner peripheral surface of the housing. A second sealing groove is formed on the outer peripheral surface of the second pole shoe, and a second sealing ring is provided in the second sealing groove, with the outer peripheral surface of the second sealing ring fitting against the inner peripheral surface of the housing.

6. The bearingless radial micro / nano magnetic medium sealing device according to claim 1, characterized in that, A third sealing groove is provided on the inner circumferential surface of the bushing, and a third sealing ring is provided in the third sealing groove, with the inner circumferential surface of the third sealing ring fitting against the outer circumferential surface of the rotating shaft. A fourth sealing groove is provided on the inner circumferential surface of the sealing sleeve, and a fourth sealing ring is provided in the fourth sealing groove, with the inner circumferential surface of the fourth sealing ring fitting against the outer circumferential surface of the bushing.

7. An assembly method for a bearingless radial micro / nano magnetic medium sealing device according to any one of claims 1-6, characterized in that, Includes the following steps: Step 1: Fix the first pole shoe at a preset position inside the shell body; Step 2: Install the permanent magnet into the shell body and abut it against the first pole shoe in the axial direction of the bushing; Step 3: Securely fit the sealing sleeve onto the preset position of the bushing; Step 4: Insert the sealing sleeve and the shaft sleeve assembled in Step 4 into the housing body, so that a first sealing gap is formed between the first pole shoe and the first pole tooth, and the two ends of the shaft sleeve extend out of the housing body; Step 5: Fix the second pole shoe in a preset position inside the housing body and abut it against the permanent magnet in the axial direction of the bushing, so that a second sealing gap is formed between the second pole shoe and the second pole tooth; Step Six: Secure the end cap to the shell body; Step 7: Fix the calibration plate at a preset position on the bushing, push the calibration plate along the axial direction of the bushing, and make the calibration plate parallel to the calibration surface, so that the width of the first sealing gap is the same as that of the second sealing gap.

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