Anti-wear micro-nano magnetic medium sealing device

Abstract

The application provides a kind of anti-wear and tear micro-nano magnetic medium sealing device, relating to the technical field of sealing device, comprising shell, rotating shaft and sealing assembly, shell has chamber, rotating shaft is pivotally connected with chamber and at least one end is located outside shell;Sealing assembly is fitted in chamber and is sleeved on rotating shaft, sealing assembly includes first pole shoe, first labyrinth seal ring and second pole shoe arranged in turn along the axial direction of rotating shaft, annular permanent magnet is arranged between first pole shoe and second pole shoe, annular permanent magnet is located in chamber and is sleeved on first labyrinth seal ring, first gap is defined between the inner periphery of first labyrinth seal ring and the outer periphery of rotating shaft, second gap is defined between the inner periphery of each of first pole shoe and second pole shoe and the outer periphery of rotating shaft, micro-nano magnetic medium is adsorbed in second gap, and first gap is smaller than second gap.The application can ensure the pressure resistance of micro-nano magnetic medium sealing in vibration environment, and avoid the problem of radial runout and wear and tear of pole shoe.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sealing devices, in particular to a kind of anti-collision and wear micro-nano magnetic medium sealing device. BACKGROUND

[0002] Micro-nano magnetic medium sealing is a sealing mode that micro-nano magnetic medium is bound in sealing gap by magnetic field to effectively prevent medium leakage and play sealing effect, which has the technical advantages of "zero leakage" and long service life.

[0003] In a vibration environment, shaft high-frequency radial runout is easy to damage bearing, so that the reliability of micro-nano magnetic medium sealing is reduced, and the service life is shortened, and after removing the bearing, the shaft high-frequency radial runout may cause the pole teeth of the pole shoe to collide and wear with the shaft. Therefore, when micro-nano magnetic medium sealing is used in the related art, the sealing gap between the pole teeth and the shaft is often increased to avoid collision and wear, but the increase of the sealing gap will cause the decrease of the pressure resistance of the micro-nano magnetic medium sealing, so that the micro-nano magnetic medium sealing cannot avoid the collision and wear between the pole teeth and the shaft while ensuring the pressure resistance. SUMMARY

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

[0005] To this end, an embodiment of the present application provides an anti-collision and wear micro-nano magnetic medium sealing device, which can ensure the pressure resistance of micro-nano magnetic medium sealing in a vibration environment and effectively avoid the collision and wear between the shaft radial runout and the pole shoe.

[0006] According to an anti-collision and wear micro-nano magnetic medium sealing device according to an embodiment of the present application, the anti-collision and wear micro-nano magnetic medium sealing device comprises an outer shell, a shaft and a sealing assembly, the outer shell has a cavity, the shaft is pivotably connected to the cavity and at least one end is located outside the outer shell; the sealing assembly is fitted in the cavity and is sleeved on the shaft, the sealing assembly comprises a first pole shoe, a first labyrinth seal ring and a second pole shoe arranged in sequence along the axial direction of the shaft, an annular permanent magnet is arranged between the first pole shoe and the second pole shoe, the annular permanent magnet is located in the cavity and is sleeved on the first labyrinth seal ring, a first gap is defined between the inner circumferential surface of the first labyrinth seal ring and the outer circumferential surface of the shaft, a second gap is defined between the inner circumferential surface of each of the first pole shoe and the second pole shoe and the outer circumferential surface of the shaft, micro-nano magnetic medium is adsorbed in the second gap, and the first gap is smaller than the second gap.

[0007] According to the anti-collision and anti-wear micro-nano magnetic medium sealing device, the first pole shoe, the second pole shoe, the annular permanent magnet and the micro-nano magnetic medium are matched on the rotating shaft to form a micro-nano magnetic medium sealing structure, and the first labyrinth sealing ring is used to form a labyrinth sealing structure, so that the combined sealing mode of the two can guarantee the sealing effect, and meanwhile, since the first gap is smaller than the second gap, that is, the inner circumferential surface of the first labyrinth sealing ring is closer to the rotating shaft than the inner circumferential surface of each of the first pole shoe and the second pole shoe, when the rotating shaft jumps radially in a vibration environment, the first labyrinth sealing ring will be in contact with the rotating shaft earlier than the first pole shoe and the second pole shoe, so as to collide and wear with the rotating shaft, thereby avoiding magnetic leakage and effectively preventing the problem that the pole teeth of each of the first pole shoe and the second pole shoe are damaged due to collision and wear, compared with the related art, the sealing gap between the pole teeth of the pole shoe and the rotating shaft is not increased, the pressure resistance of the micro-nano magnetic medium sealing can be guaranteed in the vibration environment, and the problem of collision and wear between the radial jump of the rotating shaft and the pole shoe can be effectively avoided.

[0008] In some embodiments, the first labyrinth sealing ring is movably connected to the chamber along the radial direction of the rotating shaft, the outer circumferential surface of the annular permanent magnet and the inner circumferential surface of the chamber define a third gap therebetween, and the sum of the first gap and the third gap is smaller than the second gap.

[0009] In some embodiments, the distance between the first pole shoe and the second pole shoe is equal to the axial length of the first labyrinth sealing ring, and the axial length of the annular permanent magnet is equal to the axial length of the first labyrinth sealing ring.

[0010] In some embodiments, the first pole shoe is closer to the high-pressure side of the sealed member than the second pole shoe, and the sealing assembly further comprises a second labyrinth sealing ring, the second labyrinth sealing ring and the first labyrinth sealing ring are arranged on the two sides of the first pole shoe along the axial direction of the rotating shaft.

[0011] The inner circumferential surface of the second labyrinth sealing ring and the outer circumferential surface of the rotating shaft define a fourth gap therebetween, and the fourth gap is smaller than the second gap.

[0012] In some embodiments, the second labyrinth sealing ring is movably connected to the chamber along the radial direction of the rotating shaft, the outer circumferential surface of the second labyrinth sealing ring and the inner circumferential surface of the chamber define a fifth gap therebetween, and the sum of the fourth gap and the fifth gap is smaller than the second gap.

[0013] Further, the fourth gap is equal to the first gap, and the third gap is equal to the fifth gap.

[0014] In some embodiments, the hardness of each of the first labyrinth sealing ring and the second labyrinth sealing ring is greater than the hardness of the rotating shaft.

[0015] In some embodiments, each of the first and second labyrinth sealing rings is provided with sealing teeth adjacent to the wall surface of the rotating shaft, and the sealing teeth of at least one of the first and second labyrinth sealing rings are sawtooth-shaped and inclined in a direction from the second pole shoe towards the first pole shoe.

[0016] Further, the sealing teeth are multiple, and the multiple sealing teeth are arranged at intervals along the axial direction of the rotating shaft, and the tooth tips of all the sealing teeth of the first labyrinth sealing ring form the inner circumferential surface of the first labyrinth sealing ring, and the tooth tips of all the sealing teeth of the second labyrinth sealing ring form the inner circumferential surface of the second labyrinth sealing ring.

[0017] In some embodiments, the outer circumferential surface of each of the first pole shoe, the annular permanent magnet, the second pole shoe and the second labyrinth sealing ring is sandwiched by a first sealing ring and the inner circumferential surface of the chamber.

[0018] Further, the first sealing ring can be one of an O-shaped sealing ring, a V-shaped sealing ring and a rectangular sealing ring.

[0019] In some embodiments, the shell comprises a shell body and an end cover, the shell body and the end cover are connected along the axial direction of the rotating shaft and jointly define the chamber, the inner circumferential surface of the shell body is provided with a first annular shoulder, the end surface of the second labyrinth sealing ring away from the first pole shoe abuts against the first annular shoulder, and the end cover is provided with a second annular shoulder adjacent to the end surface of the chamber, and the end surface of the second pole shoe away from the first labyrinth sealing ring abuts against the second annular shoulder.

[0020] The sealing assembly further comprises a magnetic isolation ring, and the opposite end surfaces of the magnetic isolation ring along the axial direction of the rotating shaft abut against the second labyrinth sealing ring and the first pole shoe, respectively.

[0021] In some embodiments, the shell body is adapted to be connected with the sealed member and is provided with a second sealing ring, and the second sealing ring is sandwiched between the shell body and the sealed member.

[0022] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of a wear-preventing micro-nano magnetic medium sealing device according to an embodiment of the present application.

[0024] Figure 2 is a state schematic diagram of a wear-preventing micro-nano magnetic medium sealing device according to an embodiment of the present application when the rotating shaft is slightly vibrated.

[0025] Figure 3 is a state diagram of the anti-wear micro-nano magnetic medium sealing device according to the embodiment of the present application when the rotating shaft vibrates greatly.

[0026] Figure 4 is a state diagram of the anti-wear micro-nano magnetic medium sealing device according to the embodiment of the present application when the rotating shaft vibrates greatly.

[0027] Reference signs:

[0028] 1, housing; 11, chamber; 12, shell; 121, first annular shoulder; 122, second sealing ring; 13, end cover; 131, second annular shoulder;

[0029] 2, rotating shaft;

[0030] 3, sealing assembly; 31, first pole shoe; 311, second gap, 32, first labyrinth sealing ring; 321, first gap; 322, sealing tooth; 33, second pole shoe; 34, annular permanent magnet; 341, third gap; 35, second labyrinth sealing ring; 351, fourth gap; 352, fifth gap; 36, first sealing ring; 37, magnetic isolation ring. DETAILED DESCRIPTION

[0031] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0032] As shown in Figures 1 to 4 , an anti-wear micro-nano magnetic medium sealing device according to an embodiment of the present application includes a housing 1, a rotating shaft 2 and a sealing assembly 3. The housing 1 has a chamber 11, and the rotating shaft 2 is pivotably connected to the chamber 11 and at least one end of the rotating shaft 2 is located outside the housing 1. The sealing assembly 3 is fitted to the chamber 11 and is sleeved on the rotating shaft 2. The sealing assembly 3 includes a first pole shoe 31, a first labyrinth sealing ring 32 and a second pole shoe 33 arranged in sequence along the axial direction of the rotating shaft 2. An annular permanent magnet 34 is arranged between the first pole shoe 31 and the second pole shoe 33. The annular permanent magnet 34 is located in the chamber 11 and is sleeved on the first labyrinth sealing ring 32. A first gap 321 is defined between the inner circumferential surface of the first labyrinth sealing ring 32 and the outer circumferential surface of the rotating shaft 2. A second gap 311 is defined between the inner circumferential surface of each of the first pole shoe 31 and the second pole shoe 33 and the outer circumferential surface of the rotating shaft 2. Micro-nano magnetic medium is adsorbed in the second gap 311. The first gap 321 is smaller than the second gap 311.

[0033] According to the anti-collision and anti-wear micro-nano magnetic medium sealing device, the micro-nano magnetic medium sealing structure is formed on the rotating shaft 2 by cooperation of the first pole shoe 31, the second pole shoe 33, the annular permanent magnet 34 and the micro-nano magnetic medium, and the labyrinth sealing structure is formed by the first labyrinth sealing ring 32, the combined sealing mode of the two can guarantee the sealing effect, and meanwhile, the first gap 321 is smaller than the second gap 311, that is, the inner circumferential surface of the first labyrinth sealing ring 32 is closer to the rotating shaft 2 than the inner circumferential surface of each of the first pole shoe 31 and the second pole shoe 33, so when the rotating shaft 2 jumps radially in the vibration environment, the first labyrinth sealing ring 32 will contact the rotating shaft 2 first, so as to collide and wear with the rotating shaft 2, which not only avoids magnetic leakage, but also effectively prevents the problem that the pole teeth of each of the first pole shoe 31 and the second pole shoe 33 are damaged due to collision and wear, compared with the related art, the sealing gap between the pole teeth of the pole shoe and the rotating shaft 2 is not increased, the pressure resistance of the micro-nano magnetic medium sealing can be guaranteed in the vibration environment, and the problem of collision and wear between the radial jumping of the rotating shaft 2 and the pole shoe can be effectively avoided.

[0034] Specifically, the chamber 11 can extend in the axial direction of the rotating shaft 2. The axial direction of the rotating shaft 2 can be the left-right direction in the figure. The sealing assembly 3 can be coaxially sleeved on the rotating shaft 2. The annular permanent magnet 34 can be coaxially sleeved on the first labyrinth sealing ring 32. The first pole shoe 31 and the second pole shoe 33 can adopt the same structure and specification.

[0035] For example, in the figure, along the left-right direction, the part of the annular permanent magnet 34 adjacent to the first pole shoe 31 can be an N pole, and the part of the annular permanent magnet 34 adjacent to the second pole shoe 33 can be an S pole, at this time, the magnetic loop of the micro-nano magnetic medium sealing structure is: the magnetic field emitted from the N pole of the annular permanent magnet 34 passes through the first pole shoe 31, the rotating shaft 2 and the second pole shoe 33 in turn, and then returns to the S pole of the annular permanent magnet 34 to form a magnetic loop.

[0036] It can be understood that one end of the rotating shaft 2 is located outside the shell 1, or both ends of the rotating shaft 2 are located outside the shell 1. The sealing assembly 3 is located in the chamber 11. All the pole teeth in the first pole shoe 31 construct the inner circumferential surface of the first pole shoe 31. All the pole teeth in the second pole shoe 33 construct the inner circumferential surface of the second pole shoe 33. In addition, the sealing gap between the pole teeth of the pole shoe and the rotating shaft 2 is not increased, so the pressure resistance of the micro-nano magnetic medium sealing will not decrease.

[0037] It should be noted that the present application is not limited to application in the field of nuclear reactor pump components, and can also be applied to other sealing occasions where the rotating shaft 2 has high-frequency radial jumping.

[0038] For example, Figure 1As shown, in some embodiments, the first labyrinth seal ring 32 is movably connected to the chamber 11 along the radial direction of the rotating shaft 2, wherein the radial direction of the rotating shaft 2 can be the up-down direction in the figure. A third gap 341 is defined between the outer circumferential surface of the annular permanent magnet 34 and the inner circumferential surface of the chamber 11. The sum of the first gap 321 and the third gap 341 is smaller than the second gap 311. This allows the annular permanent magnet 34 to move in the direction of the radial runout of the rotating shaft 2 after it comes into contact with the first labyrinth seal ring 32. In other words, the rotating shaft 2 pushes the first labyrinth seal ring 32 to move with the annular permanent magnet 34 in the direction of the runout of the rotating shaft 2, thereby passively adjusting the magnetic field strength of the second gap 311 and reducing the impact of the radial runout of the rotating shaft 2 on the pressure resistance of the micro-nano magnetic medium.

[0039] It is understood that the inner circumferential surface of the chamber 11 is also the inner circumferential surface of the housing 1. Furthermore, when the third gap 341 between the annular permanent magnet 34 and the housing 1 decreases on one side, the gap between the annular permanent magnet 34 and the housing 1 increases in the opposite circumferential direction, forming a large gap there. At this point, the radial distance between the annular permanent magnet 34 and the rotating shaft 2 on the large gap side decreases, that is, the distance between the inner circumferential surface of the annular permanent magnet 34 on the large gap side and the outer circumferential surface of the rotating shaft 2 decreases. This increases the magnetic field strength at the micro-nano magnetic medium on the large gap side, thereby ensuring the sealing and pressure resistance of the micro-nano magnetic medium.

[0040] like Figure 1 As shown, in some embodiments, the distance between the first pole piece 31 and the second pole piece 33 is equal to the axial length of the first labyrinth sealing ring 32 , so that the first pole piece 31 and the second pole piece 33 can realize axial positioning of the first labyrinth sealing ring 32 .

[0041] The axial length of the annular permanent magnet 34 is equal to the axial length of the first labyrinth seal ring 32 , that is, the axial length of the annular permanent magnet 34 is equal to the distance between the first pole shoe 31 and the second pole shoe 33 , so the axial positioning of the annular permanent magnet 34 can be guaranteed.

[0042] like Figure 1 As shown, in some embodiments, the first pole shoe 31 is closer to the high-pressure side of the sealed component than the second pole shoe 33, and the sealing assembly 3 also includes a second labyrinth sealing ring 35. The second labyrinth sealing ring 35 and the first labyrinth sealing ring 32 are respectively arranged on both sides of the first pole shoe 31 along the axial direction of the rotating shaft 2. In other words, the second labyrinth sealing ring 35 is closer to the high-pressure side of the sealed component than the first pole shoe 31.

[0043] A fourth gap 351 is defined between the inner circumference of the second labyrinth sealing ring 35 and the outer circumference of the rotating shaft 2. The fourth gap 351 is smaller than the second gap 311. That is, the inner circumference of the second labyrinth sealing ring 35 is closer to the rotating shaft 2 than the inner circumference of each of the first pole shoe 31 and the second pole shoe 33.

[0044] For example, the second labyrinth seal ring 35 can be located on the left side of the first pole shoe 31, and the first labyrinth seal ring 32 can be located on the right side of the first pole shoe 31. At this time, the left side of the housing 1 in the sealing device can be the high-pressure side of the sealed member, and the right side of the housing 1 can be the low-pressure side of the sealed member.

[0045] It can be understood that after the sealing device is installed on the sealed member, during the process of filling the high-pressure gas into the sealing chamber of the sealed member, the second labyrinth seal ring 35 can reduce the energy of the high-pressure gas flow to protect the micro-nano magnetic medium in the micro-nano magnetic medium sealing structure from being broken by the high-energy gas flow. At the same time, because the fourth gap 351 is smaller than the second gap 311, when the rotating shaft 2 jumps radially, the second labyrinth seal ring 35 will contact the rotating shaft 2 before the first pole shoe 31 and the second pole shoe 33, so as to be collided and ground with the rotating shaft 2, further ensuring the reliability of the anti-collision and anti-grinding of the micro-nano magnetic medium sealing structure.

[0046] As shown in Figure 1 In some embodiments, the second labyrinth seal ring 35 is movably connected to the chamber 11 along the radial direction of the rotating shaft 2, and the outer circumferential surface of the second labyrinth seal ring 35 and the inner circumferential surface of the chamber 11 define a fifth gap 352 therebetween. The sum of the fourth gap 351 and the fifth gap 352 is smaller than the second gap 311, so that after the second labyrinth seal ring 35 is contacted by the rotating shaft 2 when the rotating shaft 2 jumps radially, the second labyrinth seal ring 35 is pushed by the rotating shaft 2 to move along the jumping direction of the rotating shaft 2, thereby cooperating with the first labyrinth seal ring 32, and further improving the anti-collision and anti-grinding performance of the sealing device.

[0047] Further, the fourth gap 351 is equal to the first gap 321, and the third gap 341 is equal to the fifth gap 352, that is, the movable range of the second labyrinth seal ring 35 and the first labyrinth seal ring 32 in the chamber 11 along the radial direction of the rotating shaft 2 is the same. Because the fourth gap 351 is equal to the first gap 321, when the rotating shaft 2 jumps radially, the first labyrinth seal ring 32 and the second labyrinth seal ring 35 can basically move synchronously in the chamber 11.

[0048] It can be understood that the first gap 321, the second gap 311, the third gap 341, the fourth gap 351, and the fifth gap 352 are annular gaps.

[0049] As shown in Figure 1 In some embodiments, the hardness of each of the first labyrinth seal ring 32 and the second labyrinth seal ring 35 is greater than the hardness of the rotating shaft 2, which can reduce the wear of the first labyrinth seal ring 32 and the second labyrinth seal ring 35 by the rotating shaft 2, and ensure the service life of the sealing device.

[0050] As shown in Figure 1As shown, in some embodiments, each of the first labyrinth sealing ring 32 and the second labyrinth sealing ring 35 is provided with a sealing tooth 322 on the wall adjacent to the rotating shaft 2, and the sealing tooth 322 of at least one of the first labyrinth sealing ring 32 and the second labyrinth sealing ring 35 is a serrated tooth and is inclined in the direction from the second pole shoe 33 toward the first pole shoe 31. In other words, taking the figure as an example, the sealing tooth 322 is a conical helical tooth inclined toward the left.

[0051] Among them, the sealing teeth 322 of the first labyrinth sealing ring 32 are serrated and inclined in the direction from the second pole shoe 33 toward the first pole shoe 31; or, the sealing teeth 322 of the second labyrinth sealing ring 35 are serrated and inclined in the direction from the second pole shoe 33 toward the first pole shoe 31; or, the sealing teeth 322 of the first labyrinth sealing ring 32 and the sealing teeth 322 of the second labyrinth sealing ring 35 are both serrated and inclined in the direction from the second pole shoe 33 toward the first pole shoe 31.

[0052] It can be understood that by adopting the above-mentioned structural design, during the non-steady-state flow process of pressurization (i.e., filling the sealed chamber of the sealed component with high-pressure gas), the sealing teeth 322 can effectively increase the flow resistance to the airflow, reduce the pressure of the high-pressure gas, and make the micro-nano magnetic medium contact with the airflow of lower energy, thereby effectively preventing the micro-nano magnetic medium film from being broken during the pressurization process.

[0053] Furthermore, there are multiple sealing teeth 322, and the multiple sealing teeth 322 are arranged at intervals along the axial direction of the rotating shaft 2. The tooth tops of all the sealing teeth 322 in the first labyrinth sealing ring 32 construct the inner circumferential surface of the first labyrinth sealing ring 32, and the tooth tops of all the sealing teeth 322 in the second labyrinth sealing ring 35 construct the inner circumferential surface of the second labyrinth sealing ring 35.

[0054] Preferably, the plurality of sealing teeth 322 are arranged at equal intervals along the axial direction of the rotating shaft 2 to ensure uniform force on all the sealing teeth 322 in the first labyrinth sealing ring 32 and the second labyrinth sealing ring 35 .

[0055] like Figure 1 As shown, in some embodiments, a first sealing ring 36 is sandwiched between the outer circumference of each of the first pole shoe 31, the annular permanent magnet 34, the second pole shoe 33 and the second labyrinth sealing ring 35 and the inner circumference of the chamber 11. The first sealing ring 36 can form a sealing structure between the aforementioned components and the inner circumference of the chamber 11. At the same time, when the rotating shaft 2 radially jumps, the friction loss between the aforementioned components and the inner circumference of the chamber 11 can be reduced.

[0056] For example, an annular groove may be provided on the outer circumference of at least one of the first pole shoe 31 , the annular permanent magnet 34 , the second pole shoe 33 and the second labyrinth seal ring 35 , and the first sealing ring 36 may be fitted in the annular groove and abut against the inner circumference of the chamber 11 .

[0057] Preferably, the outer circumferential surface of each of the first pole shoe 31, the annular permanent magnet 34, the second pole shoe 33 and the second labyrinth seal ring 35 is clamped with the first sealing ring 36 and the inner circumferential surface of the chamber 11, and the outer circumferential surface of each of the first pole shoe 31, the annular permanent magnet 34, the second pole shoe 33 and the second labyrinth seal ring 35 can be provided with an annular groove, and the first sealing ring 36 can be fitted in the annular groove and abut against the inner circumferential surface of the chamber 11.

[0058] It should be noted that the specific specifications and shapes of the first sealing ring 36 in the first pole shoe 31, the annular permanent magnet 34, the second pole shoe 33 and the second labyrinth seal ring 35 can be designed according to the needs of the aforementioned components, in other words, the specific structure of the first sealing ring 36 on the aforementioned components is not necessarily the same.

[0059] As shown in the drawings, Figure 1 In some embodiments, the housing 1 includes a shell 12 and an end cover 13 sleeved on the rotating shaft 2, the shell 12 and the end cover 13 are connected along the axial direction of the rotating shaft 2 and jointly define the chamber 11, the inner circumferential surface of the shell 12 is provided with a first annular shoulder 121, the end surface of the second labyrinth seal ring 35 away from the first pole shoe 31 abuts against the first annular shoulder 121, and the end cover 13 is provided with a second annular shoulder 131 adjacent to the end surface of the chamber 11, and the end surface of the second pole shoe 33 away from the first labyrinth seal ring 32 abuts against the second annular shoulder 131.

[0060] The sealing assembly 3 further includes a magnetic isolation ring 37, the opposite end surfaces of the magnetic isolation ring 37 along the axial direction of the rotating shaft 2 abut against the second labyrinth seal ring 35 and the first pole shoe 31 respectively, in other words, one of the opposite end surfaces of the magnetic isolation ring 37 along the axial direction of the rotating shaft 2 abuts against the second labyrinth seal ring 35, and the other end surface abuts against the first pole shoe 31.

[0061] It can be understood that the axial positioning of the second labyrinth seal ring 35 can be achieved by cooperation of the first annular shoulder 121 and the magnetic isolation ring 37, and the second annular shoulder 131 can limit the micro-nano magnetic medium sealing structure in the chamber 11 along the axial direction of the rotating shaft 2.

[0062] Further, the shell 12 and the end cover 13 are threadedly connected, which ensures the connection reliability between the two, is conducive to the disassembly of the sealing device, and reduces the later maintenance cost.

[0063] As shown in the drawings, Figure 1 In some embodiments, the shell 12 is adapted to be connected with the sealed member and is provided with a second sealing ring 122, the second sealing ring 122 is clamped between the shell 12 and the sealed member to seal the connection gap therebetween, further ensuring the sealing reliability of the sealing device in the sealed member.

[0064] For example, the shell 12 can be connected with the sealed member through a flange, and an end surface of the flange can be provided with an annular groove, and the second sealing ring 122 can be matched in the annular groove.

[0065] Further, the first sealing ring 36 and the second sealing ring 122 can be one of an O-shaped sealing ring, a V-shaped sealing ring and a rectangular sealing ring.

[0066] It should be noted that the shell 1, the first labyrinth sealing ring 32, the second labyrinth sealing ring 35 and the magnetic isolation ring 37 are all made of non-magnetic conductive material, or are all provided with a non-magnetic conductive material coating; and the rotating shaft 2, the first pole shoe 31 and the second pole shoe 33 are all made of magnetic conductive material, such as 2Cr13 material with good magnetic conductivity; and the annular permanent magnet 34 can be a neodymium-iron-boron annular permanent magnet 34, and the magnetization direction is axial magnetization.

[0067] Therefore, the present application has the following advantages compared with the related art:

[0068] 1) When the rotating shaft 2 has small amplitude radial runout, the non-magnetic conductive first labyrinth sealing ring 32 and the second labyrinth sealing ring 35 are in contact with the rotating shaft 2 before the first pole shoe 31 and the second pole shoe 33, avoiding magnetic leakage;

[0069] 2) When the rotating shaft 2 has medium amplitude radial runout, the annular permanent magnet 34 moves with the rotating shaft 2 in the runout direction, passively adjusting the magnetic field strength of the sealing gap, reducing the influence of the radial runout of the rotating shaft 2 on the pressure resistance;

[0070] 3) When the rotating shaft 2 has large amplitude radial runout, the first labyrinth sealing ring 32 and the second labyrinth sealing ring 35 are in contact with the rotating shaft 2 before the first pole shoe 31 and the second pole shoe 33, avoiding damage to the first pole shoe 31 and the second pole shoe 33 due to contact and abrasion;

[0071] 4) The annular permanent magnet 34 sleeved on the first labyrinth sealing ring 32 and the first sealing ring 36 (i.e. rubber ring) clamped between the second labyrinth sealing ring 35 and the inner circumferential surface of the chamber 11 can all buffer the contact and abrasion force, improving the reliability of the connection between the sealing member and the sealed member;

[0072] 5) The first labyrinth sealing ring 32 and the second labyrinth sealing ring 35 can reduce the energy of the high-pressure gas flow during the pressurization process, protecting the micro-nano magnetic medium from being broken by the high-energy gas flow.

[0073] Now, the working state of the sealing device will be described in combination with the amplitude of the radial runout of the rotating shaft 2, specifically:

[0074] For example, Figure 2As shown, when the rotating shaft 2 has a small radial runout, the first labyrinth seal ring 32 and the second labyrinth seal ring 35 are in contact with the rotating shaft 2 prior to the first pole shoe 31 and the second pole shoe 33;

[0075] As shown, when the rotating shaft 2 has a medium radial runout, the rotating shaft 2 pushes the first labyrinth seal ring 32 and the second labyrinth seal ring 35 to move along the radial direction of the rotating shaft 2 until the first labyrinth seal ring 32 and the annular permanent magnet 34 are in contact with the inner circumferential surface of the cavity 11, that is, the radial gap becomes 0, at this time, the first pole shoe 31 and the second pole shoe 33 are still not in contact with the outer circumferential surface of the rotating shaft 2; Figure 3 As shown, when the rotating shaft 2 has a large radial runout, the first labyrinth seal and the second labyrinth seal are in contact with the outer circumferential surface of the rotating shaft 2, avoiding the problem that the first pole shoe 31 and the second pole shoe 33 are damaged by being in contact with the rotating shaft 2.

[0076] Figure 4 In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0077] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0078] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0079] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0080] ​In the present application, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Also, a first feature "over", "above" and "on top of" a second feature can be directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. A first feature "under", "below" and "underneath" a second feature can be directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0081] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the present application. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Moreover, the terms "first", "second", "third", etc. are used herein merely as identifiers for different elements, regions, layers, or sections, and are not intended to denote a spatial or chronological priority or order except if explicitly so defined. Also, the terms "comprises", "comprising", "includes", "including", or the like are used herein to generally mean comprising, including, or consisting of, unless otherwise indicated.

[0082] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary, and are not to be interpreted as limiting the present application, and that changes, modifications, substitutions and variations can be made therein by those skilled in the art without departing from the scope of the present application.

Claims

1. A micro-nano magnetic medium sealing device for preventing collision and wear, characterized in that: include: A housing and a rotating shaft, wherein the housing has a chamber, the rotating shaft is pivotally connected to the chamber and has at least one end located outside the housing; as well as A sealing assembly, the sealing assembly being fitted into the chamber and sleeved on the rotating shaft, the sealing assembly comprising a first pole shoe, a first labyrinth sealing ring, and a second pole shoe arranged in sequence along the axial direction of the rotating shaft, an annular permanent magnet being provided between the first pole shoe and the second pole shoe, the annular permanent magnet being located in the chamber and sleeved on the first labyrinth sealing ring, a first gap being defined between the inner circumference of the first labyrinth sealing ring and the outer circumference of the rotating shaft, a second gap being defined between the inner circumference of each of the first pole shoe and the second pole shoe and the outer circumference of the rotating shaft, a micro-nano magnetic medium being adsorbed in the second gap, and the first gap being smaller than the second gap; The first labyrinth sealing ring is movably connected to the chamber along the radial direction of the rotating shaft, and a third gap is defined between the outer circumferential surface of the annular permanent magnet and the inner circumferential surface of the chamber. The sum of the first gap and the third gap is smaller than the second gap. After the rotating shaft undergoes radial runout and contacts the first labyrinth sealing ring, the annular permanent magnet moves in the runout direction of the rotating shaft.

2. The anti-collision and wear micro-nano magnetic medium sealing device according to claim 1, characterized in that: The distance between the first pole shoe and the second pole shoe is equal to the axial length of the first labyrinth seal ring, and the axial length of the annular permanent magnet is equal to the axial length of the first labyrinth seal ring.

3. The anti-collision and wear micro-nano magnetic medium sealing device according to claim 1 or 2, characterized in that: The first pole piece is closer to the high-pressure side of the sealed component than the second pole piece, and the sealing assembly further includes a second labyrinth sealing ring, wherein the second labyrinth sealing ring and the first labyrinth sealing ring are respectively arranged on both sides of the first pole piece along the axial direction of the rotating shaft; A fourth gap is defined between the inner circumferential surface of the second labyrinth sealing ring and the outer circumferential surface of the rotating shaft, and the fourth gap is smaller than the second gap.

4. The anti-collision and wear micro-nano magnetic medium sealing device according to claim 3, characterized in that: The second labyrinth sealing ring is movably connected to the chamber along the radial direction of the rotating shaft, a fifth gap is defined between the outer circumference of the second labyrinth sealing ring and the inner circumference of the chamber, and the sum of the fourth gap and the fifth gap is smaller than the second gap.

5. The anti-collision and wear micro-nano magnetic medium sealing device according to claim 3, characterized in that: A hardness of each of the first labyrinth seal ring and the second labyrinth seal ring is greater than a hardness of the rotating shaft.

6. The anti-collision and wear micro-nano magnetic medium sealing device according to claim 3, characterized in that: Each of the first labyrinth sealing ring and the second labyrinth sealing ring is provided with sealing teeth on a wall surface adjacent to the rotating shaft, and the sealing teeth of at least one of the first labyrinth sealing ring and the second labyrinth sealing ring are saw teeth and are inclined in a direction from the second pole piece toward the first pole piece; And / or, there are multiple sealing teeth, and the multiple sealing teeth are arranged at intervals along the axial direction of the rotating shaft.

7. The anti-collision and wear micro-nano magnetic medium sealing device according to claim 3, characterized in that: A first sealing ring is sandwiched between the outer circumference of each of the first pole shoe, the annular permanent magnet, the second pole shoe and the second labyrinth sealing ring and the inner circumference of the chamber; And / or, the first sealing ring may be one of an O-shaped sealing ring, a V-shaped sealing ring and a rectangular sealing ring.

8. The anti-collision and wear micro-nano magnetic medium sealing device according to claim 3, characterized in that: The housing includes a shell and an end cover sleeved on the rotating shaft, the shell and the end cover are connected along the axial direction of the rotating shaft and together define the chamber, the inner circumferential surface of the shell is provided with a first annular shoulder, the end surface of the second labyrinth seal ring facing away from the first pole piece abuts against the first annular shoulder, and the end surface of the end cover adjacent to the chamber is provided with a second annular shoulder, the end surface of the second pole piece facing away from the first labyrinth seal ring abuts against the second annular shoulder; The sealing assembly further includes a magnetic isolation ring, and two opposite end surfaces of the magnetic isolation ring along the axial direction of the rotating shaft are respectively in contact with the second labyrinth sealing ring and the first pole shoe.

9. The anti-collision and wear micro-nano magnetic medium sealing device according to claim 8, characterized in that: The housing is suitable for being connected to the sealed component and is provided with a second sealing ring, and the second sealing ring is sandwiched between the housing and the sealed component.

Images