Bearing-free radial micro-nano magnetic medium sealing device and assembling method thereof

Abstract

The invention discloses a bearingless radial micro-nano magnetic medium sealing device and an assembling method thereof, the bearingless radial micro-nano magnetic medium sealing device comprises a shell, a shaft sleeve, a rotating shaft, a micro-nano magnetic medium sealing assembly and a calibration plate, the shaft sleeve is rotatably arranged in the shell, and one end of the shaft sleeve extends out of an end cover. When the calibration plate abuts against the calibration face in parallel, the width of the first sealing gap is equal to that of the second sealing gap. When the rotating shaft rotates at a high speed, the bearing can adapt to frequent radial run-out of the rotating shaft, the problem that the service life of the bearing is shortened due to run-out is solved, and the reliability of a sealing system is improved. According to the micro-nano magnetic medium sealing device, the width of the first sealing gap and the width of the second sealing gap are adjusted through the calibration plate, so that the widths of the two gaps are equal, the sealing uniformity and stability of the micro-nano magnetic medium are guaranteed, the sealing pressure resistance is improved, and the service life of a coolant pump with the micro-nano magnetic medium sealing device is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of bearingless radial micro-nano magnetic medium sealing devices, and in particular to a bearingless radial micro-nano magnetic medium sealing device and an assembly method thereof. Background Art

[0002] Micro-nano magnetic medium seal is a sealing form that uses non-uniform magnetic field force to restrain micro-nano magnetic medium to prevent medium leakage, and has the advantage of "zero leakage". However, the bearingless radial micro-nano magnetic medium seal device has the characteristic of frequent radial runout under the coolant pump working condition. Due to the existence of the traditional axial micro-nano magnetic medium seal bearing, the runout causes the bearing life to be reduced, resulting in a reduction in the reliability of the traditional micro-nano magnetic medium seal. In the related technology, the radial micro-nano magnetic medium seal with a bearingless design can meet the working environment of the bearingless radial micro-nano magnetic medium seal device coolant pump and other working conditions, and has higher reliability and durability. However, in the state without bearing support, the traditional axial micro-nano magnetic medium seal assembly cannot meet the uniformity of the radial micro-nano magnetic medium seal pole tooth gap, which greatly affects the pressure resistance and service life of the radial micro-nano magnetic medium seal. 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 bearingless radial micro-nano magnetic medium sealing device and an assembly method thereof.

[0005] The bearingless radial micro-nano magnetic medium sealing device of the embodiment of the present invention comprises a housing, a sleeve, a rotating shaft, a micro-nano magnetic medium sealing assembly and a calibration plate, wherein the housing comprises a shell body and an end cover; the sleeve is rotatably arranged in the housing and one end thereof extends out of the end cover, the rotating shaft is passed through the sleeve, and the outer side wall of the end cover has a calibration surface arranged perpendicular to the sleeve;

[0006] The micro-nano magnetic medium sealing assembly is arranged in the housing and includes a first pole shoe, a second pole shoe, a permanent magnet and a sealing sleeve, wherein the first pole shoe and the second pole shoe are sleeved on the sleeve along the axial direction of the sleeve and connected to the housing, the permanent magnet is arranged between the first pole shoe and the second pole shoe, the sealing sleeve is sleeved on the sleeve and has a first pole tooth and a second pole tooth opposite to each other along the axial direction of the sleeve, the first pole tooth and the second pole tooth are arranged 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 arranged on a side of the shell body adjacent to the end cover and is vertically connected to the sleeve. When the calibration plate is parallelly abutted 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 is provided with a through hole for the calibration bolt to pass through, the calibration surface is provided with a threaded hole, and 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 sleeve, the calibration slot is located outside the shell and is arranged on a side adjacent to the end cover, and one end of the calibration plate is clamped in the calibration slot.

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

[0011] In some embodiments, a first retaining groove and a second retaining groove are provided on the outer circumferential surface of the sleeve, and the first retaining groove and the second retaining groove are arranged in the housing at an axial interval along the sleeve, a first retaining spring is provided on the first retaining groove, and a second retaining spring is provided on the second retaining groove, and the first retaining spring and the second retaining spring are provided on both sides of the sealing sleeve to fix the axial position of the sealing sleeve on the sleeve.

[0012] In some embodiments, a positioning hole for a positioning screw to pass through is opened on the side wall of the sleeve, the positioning hole is located outside the shell, the positioning screw is connected to the positioning hole and the top end of the positioning screw stops on the rotating shaft.

[0013] In some embodiments, there are a plurality of first polar teeth, which are arranged at intervals in the radial direction of the sleeve, and there are a plurality of second polar teeth, which are arranged at intervals in the radial direction of the sleeve.

[0014] In some embodiments, a first sealing groove is provided on the outer circumference of the first pole shoe, a first sealing ring is provided in the first sealing groove and the outer circumference of the first sealing ring is fitted with the inner circumference of the shell, and a second sealing groove is provided on the outer circumference of the second pole shoe, a second sealing ring is provided in the second sealing groove and the outer circumference of the second sealing ring is fitted with the inner circumference of the shell.

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

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

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

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

[0019] Step 3: Fixing the sealing sleeve on a preset position of the shaft sleeve;

[0020] Step 4: inserting the sealing sleeve and the shaft sleeve assembled in step 4 into the shell body, so that the first pole shoe and the first pole tooth are spaced to form a first sealing gap, and both ends of the shaft sleeve extend out of the shell body;

[0021] Step 5: fix the second pole shoe at a preset position in the shell body and abut against the permanent magnet in the axial direction of the sleeve, so that a second sealing gap is formed between the second pole shoe and the second pole tooth;

[0022] Step 6: Fix the end cover on the shell body;

[0023] Step seven: fix the calibration plate at a preset position of the sleeve, push the calibration plate along the axial direction of the sleeve, and make the calibration plate parallel to and stop against 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 assembly method thereof of the embodiment of the present invention, because the first sealing gap and the second sealing gap realize the micro-nano magnetic medium sealing of the shaft sleeve in the radial direction, there is no need to set an additional bearing to support the rotating shaft in the micro-nano magnetic medium sealing device. When the rotating shaft is running at high speed, the radial micro-nano magnetic medium sealing device with a bearingless design can adapt to the frequent radial runout of the rotating shaft, reduce the problem of reduced bearing life caused by the runout, and thus improve the reliability of the sealing system. The widths of the first sealing gap and the second sealing gap are adjusted by a calibration plate so that the widths of the two gaps are equal, thereby ensuring the uniformity and stability of the micro-nano magnetic medium seal, thereby enhancing the pressure resistance of the seal. Since the sealing effect is improved, medium leakage is reduced, thereby extending the service life of the coolant pump with the micro-nano magnetic medium sealing device of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of a state in which the widths of the first sealing gap and the second sealing gap are different after the bearingless radial micro-nano magnetic medium sealing device according to an embodiment of the present invention is assembled.

[0026] Figure 2 yes Figure 1 Enlarged schematic diagram of part A.

[0027] Figure 3 yes Figure 1 Schematic diagram of the enlarged portion B.

[0028] Figure 4 It is a schematic diagram of a state in which the widths of the first sealing gap and the second sealing gap are the same after the bearingless radial micro-nano magnetic medium sealing device according to an embodiment of the present invention is assembled.

[0029] Figure 5 yes Figure 4 Enlarged schematic diagram of part C.

[0030] Figure 6 yes Figure 4 Enlarged schematic diagram of part D in the figure.

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

[0032] Reference numerals:

[0033] 100. Micro-nano magnetic medium sealing device; 1. rotating shaft; 2. shell; 201. shell body; 203. end cover; 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 retaining spring; 10. second retaining spring; 11. positioning screw; 12. first sealing ring; 13. second sealing ring; 14. third sealing ring; 15. fourth sealing ring. DETAILED DESCRIPTION

[0034] 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.

[0035] like Figures 1 to 7 As shown, the bearingless radial micro-nano magnetic medium sealing device 100 of the embodiment of the present invention comprises a housing 2, a sleeve 3, a rotating shaft 1, a micro-nano magnetic medium sealing assembly 4 and a calibration plate 7. The housing 2 comprises a shell body 201 and an end cover 203. The sleeve 3 is rotatably arranged in the housing 1 and one end extends out of the end cover 203, the rotating shaft 1 is passed through the sleeve 3, and the outer side wall of the end cover 203 has a calibration surface 2031 arranged perpendicular to the sleeve 3.

[0036] The micro-nano magnetic medium sealing assembly 4 is arranged in 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 sleeved on the shaft sleeve 3 along the axial direction of the shaft sleeve 3 and are connected to the housing 2. The permanent magnet 403 is arranged between the first pole shoe 401 and the second pole shoe 402. The sealing sleeve 404 is sleeved on the shaft sleeve 3 and has a first pole tooth 405 and a second pole tooth 406 opposite to each other along the axial direction of the shaft sleeve 3. The first pole tooth 405 and the second pole tooth 406 are arranged 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 arranged on one side of the housing 2 adjacent to the end cover 203 and is vertically connected to the shaft sleeve 3. When the calibration plate 7 is parallelly stopped on the calibration surface 2031, the width of the first sealing gap 5 is equal to the width of the second sealing gap 6.

[0038] When the bearingless radial micro-nano magnetic medium sealing device 100 of the embodiment of the present invention is in use, a magnetic circuit is formed 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 in the first sealing gap 5 and the second sealing gap 6 to form a liquid sealing ring. The magnetic medium reaches a balance under the pressure of the sealed medium and the magnetic force, thereby maintaining the sealing effect to achieve radial sealing.

[0039] Since the first sealing gap 5 and the second sealing gap 6 realize magnetic sealing of the shaft sleeve 3 in the radial direction, no additional bearing is required to support the rotating shaft 1 in the micro-nano magnetic medium sealing device 100. When the rotating shaft 1 is running at a high speed, the radial micro-nano magnetic medium sealing device 100 with a bearingless design can adapt to the frequent radial runout of the rotating shaft 1, reducing the problem of reduced bearing life caused by the 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 so that the widths of the two gaps are equal, thereby ensuring the uniformity and stability of the micro-nano magnetic medium seal, thereby enhancing the pressure resistance of the seal. Since the sealing effect is improved, medium leakage is reduced, thereby extending the service life of the coolant pump with the bearingless radial micro-nano magnetic medium sealing device 100.

[0041] In some embodiments, a through hole 701 for the calibration bolt 8 to pass through is opened on the calibration plate 7, a threaded hole 2032 is opened on the calibration surface 2031, and 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 shaft sleeve 3 are installed, if calibration is not performed, 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, since the calibration bolt 8 is connected to the threaded hole 2032 on the calibration surface 2031, the axial movement of the bolt will be restricted and can only move along the axial direction of the calibration bolt 8. The calibration bolt 8 pushes the calibration plate 7 to move, thereby adjusting the gap size between the calibration plate 7 and the calibration surface 2031.

[0043] With this structure, the position of the calibration plate 7 can be precisely adjusted to ensure that the widths of the first sealing gap 5 and the second sealing gap 6 are equal, thereby improving the uniformity and effectiveness of the seal. The adjustable calibration bolt 8 makes the adjustment process simple and convenient without the need for complicated tools or operating procedures.

[0044] In some embodiments, a calibration slot 301 is provided on the outer circumferential surface of the sleeve 3 . The calibration slot 301 is located outside the housing 2 and adjacent to a side of the end cover 203 . One end of the calibration plate 7 is mounted in the calibration slot 301 .

[0045] When the position of the calibration plate 7 needs to be adjusted, the operator can easily insert or remove one end of the calibration plate 7 into or out of the calibration slot 301 of the sleeve 3. After the calibration plate 7 is mounted in the calibration slot 301, the gap between the calibration plate 7 and the calibration surface 2031 can be adjusted by rotating the calibration bolt 8, thereby achieving precise control of the sealing gap of the micro-nano magnetic medium. Since the connection between the calibration plate 7 and the sleeve 3 is a slot type, the calibration plate 7 will not be easily displaced during the calibration process, thereby maintaining the stability of the gap adjustment. The design of the calibration slot 301 simplifies the installation process of the calibration plate 7, and does not require a complex fixing structure. The calibration plate 7 only needs to be inserted into the slot. The slot structure provides a stable support for the calibration plate 7, ensuring that the position of the calibration plate 7 will not shift during the adjustment process.

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

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

[0048] Each calibration plate 7 is adjusted at the same time, and the operator can adjust the gap uniformly along the entire circumference of the sleeve 3, avoiding the problem of local over-tightness or over-looseness that may be caused by a single calibration plate 7. Multiple calibration plates 7 provide more support points, which helps to maintain the stability of the calibration plates 7 during the adjustment process, thereby maintaining the uniformity of the gap.

[0049] In some embodiments, a first clamping groove and a second clamping groove are formed on the outer circumferential surface of the shaft sleeve 3, and the first clamping groove and the second clamping groove are arranged in the housing 2 at intervals along the axial direction of the shaft sleeve 3. A first clamping spring 9 is provided on the first clamping groove, and a second clamping spring 10 is provided on the second clamping groove. The first clamping spring 9 and the second clamping spring 10 are arranged on both sides of the sealing sleeve 404 to fix the axial position of the sealing sleeve 404 on the shaft sleeve 3.

[0050] like Figure 1 , Figure 4 and Figure 7As shown, when the sealing sleeve 404 is installed on the shaft sleeve 3, the retaining springs on both sides lock it in a specific axial position through elastic force. During the operation of the bearingless radial micro-nano magnetic medium sealing device 100, the displacement of the components may be caused due to vibration, temperature change and other reasons. The use of retaining springs can prevent the axial displacement of the sealing sleeve 404 and maintain its position 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 circlip structure provides additional axial fixation, enhances the stability of the sealing sleeve 404, and thus ensures the reliability of the seal. Stabilizing the position of the sealing sleeve 404 helps maintain the uniformity of the sealing gap and reduces 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 design of the circlip structure is usually easy to disassemble and replace, which is convenient for maintenance and overhaul.

[0052] In some embodiments, a positioning hole 302 for the positioning screw 11 to pass through is opened on the side wall of the sleeve 3. 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 stops on the rotating shaft 1.

[0053] like Figure 1 , Figure 4 and Figure 7 As shown, by tightening the positioning screw 11, the sleeve 3 and the rotating shaft 1 can maintain an accurate relative position, preventing the sleeve 3 from being displaced in the axial or circumferential direction. The use of the positioning screw 11 increases the stability between the sleeve 3 and the rotating shaft 1, preventing relative displacement caused by vibration and the like during operation. The stable position of the sleeve 3 helps to 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 sleeve 3 and provides a fast and accurate installation method.

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

[0055] like Figure 3 and Figure 6 As shown, the number of the first pole teeth 405 and the second pole teeth 406 are both multiple, and these pole teeth are designed to form a sealing gap with the corresponding pole shoe to accommodate the micro-nano magnetic medium 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 provided on the outer circumference of the first pole shoe 401, a first sealing ring 12 is provided in the first sealing groove, and the outer circumference of the first sealing ring 12 is in contact with the inner circumference of the housing 2. A second sealing groove is provided on the outer circumference of the second pole shoe 402, a second sealing ring 13 is provided in the second sealing groove, and the outer circumference of the second sealing ring 13 is in contact with the inner circumference of the housing 2.

[0057] like Figure 1 , Figure 4 and Figure 7 As shown, a first sealing groove is provided on the outer circumference of the first pole shoe 401, and a second sealing groove is provided on the outer circumference of the second pole shoe 402. These sealing grooves are usually 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 usually made of elastic materials, such as rubber or silicone, and can provide a good sealing effect. The outer circumferences of the first sealing ring 12 and the second sealing ring 13 are designed to fit with the inner circumference 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 sealing layer, which can further prevent the medium from leaking through the gap between the pole shoe and the housing 2. Since the sealing ring is usually elastic, it can compensate for the small gap that may exist between the pole shoe and the housing 2, thereby providing a better sealing effect. The fit between the outer circumference of the sealing ring and the inner circumference of the housing 2 helps to maintain the stability of the pole shoe in the housing 2 and prevent relative displacement.

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

[0060] like Figure 1 , Figure 4 and Figure 7 As shown, the third sealing ring 14 and the fourth sealing ring 15 are respectively located at the sealing interface between the shaft sleeve 3 and the rotating shaft 1 and between the sealing sleeve 404 and the shaft sleeve 3. As an additional sealing layer, they help to improve the sealing performance of the system. Since the sealing rings are elastic, they can fill and compensate for the small gaps between the shaft sleeve 3 and the rotating shaft 1, and between the sealing sleeve 404 and the shaft sleeve 3, thereby preventing medium leakage. The sealing rings are tightly fitted to the outer circumference of the shaft sleeve 3 and the rotating shaft 1, which helps to maintain the stability of the shaft sleeve 3 and the sealing sleeve 404 in the axial and circumferential directions.

[0061] By adding an additional sealing ring, the sealing effect of the system is significantly improved, effectively reducing the possibility of medium leakage. The addition of the sealing ring provides additional safety for the sealing system and enhances the overall reliability of the system.

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

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

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

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

[0066] Step 3: Fix the sealing sleeve 404 on the preset position of the shaft sleeve 3;

[0067] Specifically, before the sealing sleeve 404 is fixedly sleeved on the shaft sleeve 3, the fourth sealing ring 15 is installed in the fourth sealing groove of the sealing sleeve 404. After the sealing sleeve 404 is sleeved on the shaft sleeve 3, the first retaining spring 9 and the second retaining spring 10 are arranged on the sealing sleeve 404 to realize the positioning of the sealing sleeve 404 in the axial direction of the shaft sleeve 3.

[0068] Step 4: Install the sealing sleeve 404 and the shaft sleeve 3 assembled in step 4 into the shell body 201, so that the first pole shoe 401 and the first pole tooth 405 are spaced to form a first sealing gap 5, and both ends of the shaft sleeve 3 extend out of the shell body 201;

[0069] Step 5: fix the second pole shoe 402 at a preset position in the shell body 201 and abut against the permanent magnet 403 in the axial direction of the sleeve 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 at a preset position in the shell body 201 .

[0071] Step 6: Fix the end cover 203 on the shell body 201;

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

[0073] Step 7: fix the calibration plate 7 at the preset position of the sleeve 3, push the calibration plate 7 along the axial direction of the sleeve 3, and make the calibration plate 7 parallel to the calibration surface 2031, so that the width of the first sealing gap 5 is the same as that of the second sealing gap 6;

[0074] Specifically, the operator can rotate the calibration bolt 8. When the calibration bolt 8 is rotated, since 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 the bolt can only move along the axis direction of the calibration bolt 8. The calibration bolt 8 pushes the calibration plate 7 to move, 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 device to be sealed, and the positioning screws 11 are tightened to fix the relative position between the sleeve 3 and the shaft 1 to prevent the sleeve 3 from moving in the axial or circumferential direction. When the 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 the calibration plate 7, so that the widths of the two gaps are equal, thereby ensuring the uniformity and stability of the micro-nano magnetic medium seal, thereby enhancing the pressure resistance of the seal. Since the sealing effect is improved, medium leakage is reduced, thereby 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, and the multiple micro-nano magnetic medium sealing components 4 are arranged at intervals along the axial direction of the sleeve 3. A spacer is provided between two adjacent micro-nano magnetic medium sealing components 4, and the spacer is sleeved on the sleeve 3 and its two ends are respectively stopped on the two adjacent micro-nano magnetic medium sealing components 4.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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 bearingless radial micro-nano magnetic medium sealing device, characterized in that: include: A shell, the shell comprising a shell body and an end cover; A shaft sleeve and a rotating shaft, wherein the shaft sleeve is rotatably arranged in the housing and one end of the shaft sleeve extends out of the end cover, the rotating shaft is passed through the shaft sleeve, and the outer side wall of the end cover has a calibration surface arranged perpendicular to the shaft sleeve; A micro-nano magnetic medium sealing component, the micro-nano magnetic medium sealing component is arranged in the housing and comprises 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 sleeved on the sleeve along the axial direction of the sleeve and connected to the housing, the permanent magnet is arranged between the first pole shoe and the second pole shoe, the sealing sleeve is sleeved on the sleeve and has a first pole tooth and a second pole tooth opposite to each other along the axial direction of the sleeve, the first pole tooth and the second pole tooth are arranged 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 arranged on a side of the shell body adjacent to the end cover and is vertically connected to the sleeve. When the calibration plate is parallelly abutted against the calibration surface, the width of the first sealing gap is equal to the width of the second sealing gap.

2. The bearingless radial micro-nano magnetic medium sealing device according to claim 1, characterized in that: The calibration plate is provided with a through hole for the calibration bolt to pass through, the calibration surface is provided with a threaded hole, and the calibration bolt is connected to the threaded hole to adjust the gap between the calibration plate and the calibration surface.

3. The bearingless radial micro-nano magnetic medium sealing device according to claim 2, characterized in that: A calibration slot is provided on the outer circumferential surface of the shaft sleeve. The calibration slot is located outside the shell and is arranged on a side adjacent to the end cover. One end of the calibration plate is clamped in the calibration slot.

4. The bearingless radial micro-nano magnetic medium sealing device according to claim 3, characterized in that: The number of the calibration plates is at least three, and the at least three calibration plates are arranged at intervals along the circumference of the sleeve.

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

6. The bearingless radial micro-nano magnetic medium sealing device according to claim 1, characterized in that: A positioning hole for a positioning screw to pass through is formed on the side wall of the shaft sleeve. 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.

7. The bearingless radial micro-nano magnetic medium sealing device according to claim 1, characterized in that: There are a plurality of first polar teeth, which are arranged at intervals in the radial direction of the sleeve. There are a plurality of second polar teeth, which are arranged at intervals in the radial direction of the sleeve.

8. The bearingless radial micro-nano magnetic medium sealing device according to claim 1, characterized in that: A first sealing groove is provided on the outer circumference of the first pole shoe, a first sealing ring is provided in the first sealing groove and the outer circumference of the first sealing ring is fitted with the inner circumference of the shell; a second sealing groove is provided on the outer circumference of the second pole shoe, a second sealing ring is provided in the second sealing groove and the outer circumference of the second sealing ring is fitted with the inner circumference of the shell.

9. 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 circumference of the sleeve, a third sealing ring is provided in the third sealing groove, and the inner circumference of the third sealing ring is fitted with the outer circumference of the rotating shaft; a fourth sealing groove is provided on the inner circumference of the sealing sleeve, a fourth sealing ring is provided in the fourth sealing groove, and the inner circumference of the fourth sealing ring is fitted with the outer circumference of the sleeve.

10. An assembly method for a bearingless radial micro-nano magnetic medium sealing device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Fixing the first pole shoe at a preset position in the shell body; Step 2: Install the permanent magnet into the shell body and abut against the first pole shoe in the axial direction of the sleeve; Step 3: Fixing the sealing sleeve on a preset position of the shaft sleeve; Step 4: inserting the sealing sleeve and the shaft sleeve assembled in step 4 into the shell body, so that the first pole shoe and the first pole tooth are spaced to form a first sealing gap, and both ends of the shaft sleeve extend out of the shell body; Step 5: fix the second pole shoe at a preset position in the shell body and abut against the permanent magnet in the axial direction of the sleeve, so that a second sealing gap is formed between the second pole shoe and the second pole tooth; Step 6: Fix the end cover on the shell body; Step seven: fix the calibration plate at a preset position of the sleeve, push the calibration plate along the axial direction of the sleeve, and make the calibration plate parallel to and stop against 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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