Double-magnetic-source micro-nano magnetic medium sealing device and gas turbine

Abstract

The invention provides a double-magnetic-source micro-nano magnetic medium sealing device and a gas turbine, and relates to the technical field of sealing devices.The double-magnetic-source micro-nano magnetic medium sealing device comprises an outer rotor, an inner rotor, a first sealing assembly and a second sealing assembly; the first sealing assembly and the second sealing assembly are matched with the cavity and comprise first pole shoes, permanent magnets and second pole shoes which are sequentially arranged in the first direction, and the magnetic pole direction of the permanent magnets and the direction where the pivoting axis of the inner rotor is located are the first direction. The polarity of the permanent magnet of the first sealing assembly and the polarity of the permanent magnet of the second sealing assembly are opposite, and the permanent magnet of the first sealing assembly and the permanent magnet of the second sealing assembly are spaced in the radial direction of the inner rotor. Micro-nano magnetic media are adsorbed between the first pole shoe of the first sealing assembly and the first pole shoe of the second sealing assembly and between the second pole shoe of the first sealing assembly and the second pole shoe of the second sealing assembly. According to the invention, the stroke of a magnetic loop is shortened by adopting double magnetic sources, the magnetic field intensity at a sealing gap is increased, and the pressure resistance of a micro-nano magnetic medium under a high-speed working condition is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing devices, and in particular to a dual-magnetic source micro-nano magnetic medium sealing device and a gas turbine. Background Art

[0002] Micro-nano magnetic medium seal is a sealing form that uses magnetic field to confine micro-nano magnetic medium in the sealing gap and prevent medium leakage. Compared with traditional seals, it has the significant advantage of "zero leakage".

[0003] In the related technology, the intermediate bearing cavity of a twin-rotor gas turbine mostly adopts an air bleed seal in combination with a floating ring seal. However, the air bleed operation will reduce the working efficiency of the gas turbine. If micro-nano magnetic medium seals are used for gas turbine bearing cavity sealing, the working efficiency of the gas turbine can be effectively improved. However, micro-nano magnetic medium seals are mostly used for static sealing or low-speed dynamic sealing of single-rotor equipment. The sealing performance for high-speed equipment is insufficient, so it cannot be used for the intermediate bearing cavity sealing of high-speed twin-rotor gas turbines. Summary of the invention

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

[0005] To this end, an embodiment of one aspect of the present invention proposes a dual magnetic source micro-nano magnetic medium sealing device, which uses dual magnetic sources to shorten the magnetic circuit stroke, increase the magnetic field strength at the sealing gap, improve the pressure resistance of the micro-nano magnetic medium under high-speed working conditions, and has good sealing performance.

[0006] Another aspect of the present invention provides a gas turbine.

[0007] A dual-magnetic-source micro-nano magnetic medium sealing device according to an embodiment of the present invention comprises an outer rotor, an inner rotor, a first sealing assembly and a second sealing assembly, wherein the outer rotor has a chamber, the inner rotor is pivotally connected to the chamber and is at least partially located outside the outer rotor; the inner rotor, the first sealing assembly and the second sealing assembly are sequentially sleeved from the inside to the outside, the first sealing assembly and the second sealing assembly are both matched with the chamber and comprise a first pole shoe, a permanent magnet and a second pole shoe sequentially arranged along a first direction, the magnetic pole direction of the permanent magnet and the direction of the pivot axis of the inner rotor are both the first direction, the permanent magnet of the first sealing assembly and the permanent magnet of the second sealing assembly have opposite polarities and are spaced apart in the radial direction of the inner rotor, and in the radial direction of the inner rotor, micro-nano magnetic medium is adsorbed between the first pole shoe of the first sealing assembly and the first pole shoe of the second sealing assembly, and between the second pole shoe of the first sealing assembly and the second pole shoe of the second sealing assembly.

[0008] According to the dual-magnetic source micro-nano magnetic medium sealing device of the embodiment of the present invention, a dual-magnetic source micro-nano magnetic medium sealing structure is constructed between the inner rotor and the outer rotor by cooperating with the first sealing component and the second sealing component which are arranged in a nested manner, wherein the magnetic pole direction of the permanent magnet is the first direction, that is, the N pole and the S pole of the permanent magnet are arranged along the first direction, and at the same time, because the polarity of the permanent magnet of the first sealing component is opposite to that of the permanent magnet of the second sealing component and the two are spaced apart in the radial direction of the inner rotor, the N pole of the permanent magnet of the second sealing component is located on the outer peripheral side of the S pole of the permanent magnet of the first sealing component, and the N pole of the permanent magnet of the second sealing component is located on the outer peripheral side of the S pole of the permanent magnet of the first sealing component. The S pole is located on the outer peripheral side of the N pole of the permanent magnet of the first sealing component, and in the radial direction of the inner rotor, micro-nano magnetic media are adsorbed between the first pole shoe of the first sealing component and the first pole shoe of the second sealing component, and between the second pole shoe of the first sealing component and the second pole shoe of the second sealing component. Therefore, a magnetic circuit can be formed between the permanent magnets of the two sealing components and the two pole shoes arranged along the radial direction of the inner rotor. Compared with the related art, the present invention adopts dual magnetic sources to shorten the magnetic circuit stroke, increases the magnetic field strength at the sealing gap, improves the pressure resistance of the micro-nano magnetic medium under high-speed working conditions, and has good sealing performance.

[0009] In some embodiments, the outer circumferential surface of each of the first pole shoe and the second pole shoe of the first sealing assembly is provided with a pole tooth, and the first pole shoe and the second pole shoe of the second sealing assembly are both provided with a groove corresponding to the pole tooth, and the micro-nano magnetic medium is adsorbed between the pole tooth and the groove;

[0010] There are a plurality of pole teeth arranged at intervals along the first direction, and there are a plurality of grooves corresponding to the pole teeth one by one.

[0011] In some embodiments, the inner circumference of at least one of the first pole shoe and the second pole shoe of the second sealing assembly is provided with a non-magnetic coating, and the inner circumference of the non-magnetic coating is provided with the groove recessed toward the outer circumference of the non-magnetic coating, and the groove extends from the inner circumference of the non-magnetic coating to the outer circumference of the non-magnetic coating.

[0012] In some embodiments, the first pole shoe of each of the first sealing assembly and the second sealing assembly is provided with a first annular shoulder on the end surface of the second pole shoe adjacent to the first pole shoe, and the second pole shoe of each of the first sealing assembly and the second sealing assembly is provided with a second annular shoulder on the end surface of the first pole shoe adjacent to the first pole shoe, and the two opposite ends of the permanent magnet along the first direction are respectively abutted against the corresponding first annular shoulder and the corresponding second annular shoulder.

[0013] In some embodiments, the first annular shoulder of the first sealing assembly corresponds to the first annular shoulder of the second sealing assembly in the radial direction of the inner rotor, and the second annular shoulder of the first sealing assembly corresponds to the second annular shoulder of the second sealing assembly in the radial direction of the inner rotor;

[0014] In the first direction, the distance between the first annular shoulder and the second annular shoulder of the first sealing component is equal to the distance between the first annular shoulder and the second annular shoulder of the second sealing component.

[0015] In some embodiments, the sealing device also includes an inner sleeve, which is sleeved on the inner rotor and matched with the chamber, and the first pole shoe and the second pole shoe of the first sealing assembly are both sleeved on the inner sleeve and connected to the inner sleeve through a first locking member.

[0016] In some embodiments, the sealing device also includes an outer sleeve, which is matched with the chamber and at least partially sleeved on the first pole shoe and the second pole shoe of the second sealing assembly, the first pole shoe and the second pole shoe of the second sealing assembly are both connected to the outer sleeve through a second locking piece, and the outer rotor is sleeved on the outer sleeve.

[0017] In some embodiments, each of the first sealing assembly and the second sealing assembly has a plurality of permanent magnets which are spaced apart along the circumferential direction of the inner rotor, a plurality of first baffles are disposed on the outer circumferential surface of the inner sleeve, and a plurality of second baffles are disposed on the inner circumferential surface of the outer sleeve, the first baffles and the second baffles are spaced apart in the radial direction of the inner rotor, and opposite ends of each of the first baffles along the first direction are respectively in contact with the corresponding first annular boss and the corresponding second annular boss;

[0018] The permanent magnet is an arc-shaped permanent magnet. The two opposite end surfaces of the permanent magnet of the first sealing assembly along the circumferential direction of the inner rotor are respectively abutted against one of the first baffles. The two opposite end surfaces of the permanent magnet of the second sealing assembly along the circumferential direction of the inner rotor are respectively abutted against one of the second baffles.

[0019] In some embodiments, a first sealing ring is sandwiched between the outer circumferential surface of the inner rotor and the inner circumferential surface of the inner sleeve, between the inner circumferential surface of at least one of the first pole shoe and the second pole shoe of the first sealing assembly and the outer circumferential surface of the inner sleeve, between the outer circumferential surface of at least one of the first pole shoe and the second pole shoe of the second sealing assembly and the inner circumferential surface of the outer sleeve, and between the outer circumferential surface of the outer sleeve and the inner circumferential surface of the outer rotor.

[0020] In some embodiments, the inner sleeve and the outer sleeve each have a first end and a second end opposite to each other along the first direction, the first end of the inner sleeve abuts against the first pole shoe of the first sealing assembly, and the second end of the inner sleeve abuts against the second pole shoe of the first sealing assembly;

[0021] The sealing device also includes a retaining spring, which is sleeved on the inner rotor and abuts against the second pole shoe of the first sealing assembly. The inner rotor is provided with a shaft shoulder, and the first pole shoe of the first sealing assembly abuts against the shaft shoulder to axially position the inner sleeve.

[0022] In some embodiments, the first end of the outer sleeve abuts against the first pole shoe of the second sealing assembly, and the second end of the outer sleeve abuts against the second pole shoe of the second sealing assembly;

[0023] The sealing device also includes an end cover, which is connected to the outer rotor and is suitable for sealing the chamber. The end cover abuts against the second pole shoe of the second sealing assembly. The inner circumferential surface of the outer rotor is provided with a third annular boss. The first pole shoe of the second sealing component abuts against the third annular boss to axially position the outer sleeve.

[0024] A gas turbine according to an embodiment of the present invention comprises a sealing device, a first rotor component and a second rotor component, wherein the sealing device is the sealing device described in any of the above embodiments; an outer rotor of the sealing device is located between the first rotor component and the second rotor component and is connected to each of the first rotor component and the second rotor component.

[0025] According to the gas turbine of the embodiment of the present invention, the sealing device is designed as a dual-magnetic source micro-nano magnetic medium sealing structure, which can shorten the magnetic circuit stroke, increase the magnetic field strength at the sealing gap, and improve the sealing performance of the sealing device under the high-speed working condition of the gas turbine. Therefore, compared with the related technology, the gas turbine using the sealing device can effectively improve the working efficiency.

[0026] In some embodiments, a second sealing ring is sandwiched between at least one of the first rotor component and the second rotor component and the outer rotor, so that the second sealing ring seals a connecting gap between any one of the first rotor component and the second rotor component and the outer rotor.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the structure of a dual-magnetic source micro-nano magnetic medium sealing device according to an embodiment of the present invention.

[0029] Figure 2 yes Figure 1 Schematic diagram of the local enlarged structure in.

[0030] Figure 3 It is a schematic diagram of the connection structure between the permanent magnet and the inner sleeve of the first sealing component in the dual magnetic source micro-nano magnetic medium sealing device according to an embodiment of the present invention.

[0031] Figure 4 Schematic diagram of the connection structure between the permanent magnet and the outer sleeve of the second sealing component in the dual magnetic source micro-nano magnetic medium sealing device according to an embodiment of the present invention

[0032] Figure 5 It is a schematic structural diagram of a dual magnetic source micro-nano magnetic medium sealing device under high-speed rotation conditions according to an embodiment of the present invention.

[0033] Figure 6 yes Figure 5 Schematic diagram of the local enlarged structure in.

[0034] Reference numerals:

[0035] 1. outer rotor; 11. chamber; 12. third annular shoulder;

[0036] 2. Inner rotor; 21. Shaft shoulder;

[0037] 3. First sealing assembly; 31. First pole shoe; 311. Pole tooth; 312. Groove; 313. Non-magnetic conductive coating; 314. First annular boss; 32. Permanent magnet; 33. Second pole shoe; 331. Second annular boss; 34. First locking member;

[0038] 4. Second sealing assembly; 41. Second locking member;

[0039] 5. inner sleeve; 51. first baffle;

[0040] 6. outer sleeve; 61. second baffle;

[0041] 7. Circlip;

[0042] 8. End cap. DETAILED DESCRIPTION

[0043] 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.

[0044] like Figures 1 to 6As shown, a dual magnetic source micro-nano magnetic medium sealing device according to an embodiment of the present invention comprises an outer rotor 1, an inner rotor 2, a first sealing assembly 3 and a second sealing assembly 4, wherein the outer rotor 1 has a chamber 11, the inner rotor 2 is pivotally connected to the chamber 11 and is at least partially located outside the outer rotor 1; the inner rotor 2, the first sealing assembly 3 and the second sealing assembly 4 are sequentially sleeved from the inside to the outside, the first sealing assembly 3 and the second sealing assembly 4 are both matched with the chamber 11 and comprise a first pole shoe 31, a permanent magnet 32 ​​and a second pole shoe 33 sequentially arranged along a first direction, the magnetic pole direction of the permanent magnet 32 ​​and the direction of the pivot axis of the inner rotor 2 are both in the first direction, the permanent magnet 32 ​​of the first sealing assembly 3 and the permanent magnet 32 ​​of the second sealing assembly 4 have opposite polarities and are spaced apart in the radial direction of the inner rotor 2, and in the radial direction of the inner rotor 2, micro-nano magnetic medium is adsorbed between the first pole shoe 31 of the first sealing assembly 3 and the first pole shoe 31 of the second sealing assembly 4, and between the second pole shoe 33 of the first sealing assembly 3 and the second pole shoe 33 of the second sealing assembly 4.

[0045] According to the dual-magnetic source micro-nano magnetic medium sealing device of the embodiment of the present invention, a dual-magnetic source micro-nano magnetic medium sealing structure is constructed between the inner rotor 2 and the outer rotor 1 by cooperating with the first sealing component 3 and the second sealing component 4 which are arranged in a nested manner, wherein the magnetic pole direction of the permanent magnet 32 ​​is the first direction, that is, the N pole and the S pole of the permanent magnet 32 ​​are arranged along the first direction, and at the same time, because the polarity of the permanent magnet 32 ​​of the first sealing component 3 is opposite to that of the permanent magnet 32 ​​of the second sealing component 4 and the two are spaced apart in the radial direction of the inner rotor 2, the N pole of the permanent magnet 32 ​​of the second sealing component 4 is located on the outer peripheral side of the S pole of the permanent magnet 32 ​​of the first sealing component 3, and the permanent magnet 32 ​​of the second sealing component 4 is located on the outer peripheral side of the S pole of the permanent magnet 32 ​​of the first sealing component 3. 2 is located on the outer peripheral side of the N pole of the permanent magnet 32 ​​of the first sealing component 3, and in the radial direction of the inner rotor 2, micro-nano magnetic media are adsorbed between the first pole shoe 31 of the first sealing component 3 and the first pole shoe 31 of the second sealing component 4, and between the second pole shoe 33 of the first sealing component 3 and the second pole shoe 33 of the second sealing component 4. Therefore, a magnetic circuit can be formed between the permanent magnets 32 of the two sealing components and the two pole shoes arranged along the radial direction of the inner rotor 2. Compared with the related art, the present invention adopts dual magnetic sources to shorten the magnetic circuit stroke, increase the magnetic field strength at the sealing gap, improve the pressure resistance of the micro-nano magnetic medium under high-speed working conditions, and have good sealing performance.

[0046] Specifically, the chamber 11 may extend along the first direction. The inner rotor 2, the first sealing assembly 3, the second sealing assembly 4 and the outer rotor 1 may be coaxially sleeved in sequence from the inside to the outside. The first pole shoe 31 and the second pole shoe 33 of the first sealing assembly 3 may adopt the same structure and specifications. The first pole shoe 31 and the second pole shoe 33 of the second sealing assembly 4 may adopt the same structure and specifications. The first pole shoe 31 of the first sealing assembly 3 may correspond to the first pole shoe 31 of the second sealing assembly 4 in the radial direction of the inner rotor 2, and the second pole shoe 33 of the first sealing assembly 3 may correspond to the second pole shoe 33 of the second sealing assembly 4 in the radial direction of the inner rotor 2.

[0047] Taking the figure as an example, along the first direction, the part of the permanent magnet 32 ​​of the first sealing component 3 adjacent to the first pole shoe 31 can be the S pole, and the rest can be the N pole, while the part of the permanent magnet 32 ​​of the second sealing component 4 adjacent to the first pole shoe 31 can be the N pole, and the rest can be the S pole. At this time, the magnetic circuit of the dual magnetic source micro-nano magnetic medium sealing structure is:

[0048] Magnetic circuit 1: the magnetic field emitted from the N pole of the permanent magnet 32 ​​of the first sealing component 3 passes through the second pole shoe 33 of the first sealing component 3 and the second pole shoe 33 of the second sealing component 4 in sequence and returns to the S pole of the permanent magnet 32 ​​of the second sealing component 4;

[0049] Magnetic circuit 2: the magnetic field emitted by the N pole of the permanent magnet 32 ​​of the second sealing component 4 passes through the first pole shoe 31 of the second sealing component 4 and the first pole shoe 31 of the first sealing component 3 in sequence and returns to the S pole of the permanent magnet 32 ​​of the first sealing component 3 .

[0050] Therefore, compared with the magnetic circuit of the micro-nano magnetic medium sealing structure in the related art, in which the magnetic field emitted by the N pole of the permanent magnet 32 ​​passes through the first pole shoe 31, the inner rotor 2 (or the outer rotor 1) and the second pole shoe 33 in sequence and returns to the S pole of the permanent magnet 32, the present invention forms the magnetic circuit only between the permanent magnet 32 ​​and the two pole shoes, so the magnetic circuit stroke can be effectively shortened, thereby enhancing the magnetic field strength of the first sealing component 3 and the second sealing component 4 at the sealing gap.

[0051] It should be noted that the outer rotor 1 and the inner rotor 2 may both be made of non-magnetic conductive materials, or the outer rotor 1 and the inner rotor 2 may both be provided with non-magnetic conductive material coatings.

[0052] like Figure 1 and Figure 2As shown, in some embodiments, the outer circumferential surface of each of the first pole shoe 31 and the second pole shoe 33 of the first sealing component 3 is provided with a pole tooth 311, and the first pole shoe 31 and the second pole shoe 33 of the second sealing component 4 are both provided with a groove 312 corresponding to the pole tooth 311, and a micro-nano magnetic medium is adsorbed between the pole tooth 311 and the groove 312, so that when the micro-nano magnetic medium is thrown outward along the radial direction of the inner rotor 2 under high-speed conditions, it can be bound in the groove 312 by the centrifugal force generated by the high-speed rotating outer rotor 1, so that it is not easy to be blown away by the sealed medium along the first direction, avoiding the problem of the radial movement of the micro-nano magnetic medium causing the pressure resistance of the sealing device to decrease. In other words, the groove 312 structure designed on the first pole shoe 31 and the second pole shoe 33 of the second sealing component 4 can bind the micro-nano magnetic medium in the groove 312 when the outer rotor 1 is in a high-speed rotating state. Therefore, the groove 312 greatly reduces the influence of the centrifugal force on the pressure resistance of the sealing device.

[0053] There are multiple pole teeth 311 arranged at intervals along the first direction, there are multiple grooves 312 corresponding to the pole teeth 311 one by one, and the cooperation of multiple pole teeth 311 and multiple grooves 312 can further ensure the sealing performance of the first sealing assembly 3 and the second sealing assembly 4 between the inner rotor 2 and the outer rotor 1.

[0054] It is understandable that the setting of the pole teeth 311 will produce a non-uniform magnetic field. At the same time, due to the edge effect, the magnetic field at the pole teeth 311 is stronger, much stronger than the "axial gap between the pole teeth 311 and the pole teeth 311". Therefore, injecting the micro-nano magnetic medium between the pole teeth 311 and the groove 312 can make the micro-nano magnetic medium generate magnetic force under the action of the non-uniform magnetic field, and then under the action of the magnetic force and the pressure of the sealed medium, the micro-nano magnetic medium will reach a force equilibrium state and no longer flow, so as to achieve a sealing effect to prevent the leakage of the sealed medium.

[0055] Preferably, the plurality of pole teeth 311 are arranged at equal intervals along the first direction to ensure uniform force on all the pole teeth 311 in the first pole shoe 31 and the second pole shoe 33 of the first sealing assembly 3 .

[0056] like Figure 1 and Figure 2 As shown, in some embodiments, the inner circumference of at least one of the first pole shoe 31 and the second pole shoe 33 of the second sealing assembly 4 is provided with a non-magnetic coating 313, and the inner circumference of the non-magnetic coating 313 is provided with a groove 312 which is recessed toward the outer circumference of the non-magnetic coating 313, and the groove 312 extends from the inner circumference of the non-magnetic coating 313 to the outer circumference of the non-magnetic coating 313. In other words, the groove 312 is not coated with the non-magnetic coating 313, or the groove 312 passes through the non-magnetic coating 313, and the bottom of the groove 312 is the inner circumference of any one of the first pole shoe 31 and the second pole shoe 33 of the second sealing assembly 4.

[0057] It can be understood that since the first pole shoe 31 and the second pole shoe 33 are magnetic conductive parts, and the groove 312 is not coated with the non-magnetic coating 313, that is, the groove 312 is magnetically conductive, after the inner circumference of at least one of the first pole shoe 31 and the second pole shoe 33 of the second sealing component 4 is coated with the non-magnetic coating 313, a magnetic path will only be formed between the pole shoes coated with the non-magnetic coating 313 in the first sealing component 3 and the second sealing component 4 at the groove 312 and the corresponding pole tooth 311. At this time, the micro-nano magnetic medium is bound between the groove 312 and the corresponding pole tooth 311 under the action of magnetic force, and will not flow along the first direction, thereby improving the reliability of the micro-nano magnetic medium sealing.

[0058] In addition, the inner circumferential surface of the first pole shoe 31 of the second sealing component 4 is provided with a non-magnetic coating 313; or, the inner circumferential surface of the second pole shoe 33 of the second sealing component 4 is provided with a non-magnetic coating 313; or, the inner circumferential surface of each of the first pole shoe 31 and the second pole shoe 33 of the second sealing component 4 is provided with a non-magnetic coating 313.

[0059] Preferably, the inner circumferential surface of each of the first pole shoe 31 and the second pole shoe 33 of the second sealing assembly 4 is provided with a non-magnetic conductive coating 313 to further make the micro-nano magnetic medium seal of the sealing device resistant to high speed.

[0060] It should be noted that the thickness of the non-magnetic coating 313 (i.e., the distance from the inner circumference to the outer circumference of the non-magnetic coating 313) is based on ensuring that the micro-nano magnetic medium can be reliably bound between the groove 312 and the corresponding pole tooth 311 without affecting the rotation of the inner rotor 2 and the outer rotor 1, which will not be elaborated here.

[0061] like Figure 1 As shown, in some embodiments, the first pole shoe 31 of each of the first sealing component 3 and the second sealing component 4 is provided with a first annular boss 314 on the end surface adjacent to the second pole shoe 33, and the second pole shoe 33 of each of the first sealing component 3 and the second sealing component 4 is provided with a second annular boss 331 on the end surface adjacent to the first pole shoe 31, and the two opposite ends of the permanent magnet 32 ​​along the first direction are respectively abutted against the corresponding first annular boss 314 and the corresponding second annular boss 331, wherein the first pole shoe 31 and the second pole shoe 33 can realize axial positioning of the permanent magnet 32, while the first annular boss 314 and the second annular boss 331 can radially position the permanent magnet 32.

[0062] like Figure 1As shown, in some embodiments, the first annular shoulder 314 of the first sealing component 3 corresponds to the first annular shoulder 314 of the second sealing component 4 in the radial direction of the inner rotor 2, and the second annular shoulder 331 of the first sealing component 3 corresponds to the second annular shoulder 331 of the second sealing component 4 in the radial direction of the inner rotor 2, that is, in the first direction, the position of the first annular shoulder 314 of the first sealing component 3 is consistent with the position of the first annular shoulder 314 of the second sealing component 4, and the position of the second annular shoulder 331 of the first sealing component 3 is consistent with the position of the second annular shoulder 331 of the second sealing component 4, therefore, the position of the permanent magnet 32 ​​of the first sealing component 3 in the first direction is consistent with the position of the permanent magnet 32 ​​of the second sealing component 4 in the first direction.

[0063] In the first direction, the distance between the first annular boss 314 and the second annular boss 331 of the first sealing component 3 is equal to the distance between the first annular boss 314 and the second annular boss 331 of the second sealing component 4. Combined with the above-mentioned abutment arrangement of the permanent magnet 32 ​​and the annular boss, it can be seen that the length of the permanent magnet 32 ​​of the first sealing component 3 is equal to the length of the permanent magnet 32 ​​of the second sealing component 4.

[0064] It can be understood that the above structural design can ensure the sealing stability between the first sealing component 3 and the second sealing component 4.

[0065] Further, the first pole shoe 31 and the second pole shoe 33 of the first sealing component 3 are arranged in a mirror-symmetrical manner relative to the first reference plane, and the first pole shoe 31 and the second pole shoe 33 of the second sealing component 4 are arranged in a mirror-symmetrical manner relative to the second reference plane. The first reference plane is perpendicular to the first direction and coplanar with the second reference plane. The center of the permanent magnet 32 ​​of each of the first sealing component 3 and the second sealing component 4 is coplanar with the first reference plane, that is, the N pole and the S pole of the permanent magnet 32 ​​are mirror-symmetrical relative to the first reference plane. With the above-mentioned structural design, reliable and stable sealing of the first sealing component 3 and the second sealing component 4 between the inner rotor 2 and the outer rotor 1 can be achieved.

[0066] like Figure 1 As shown, in some embodiments, the sealing device also includes an inner sleeve 5, which is sleeved on the inner rotor 2 and matched with the chamber 11, and the first pole shoe 31 and the second pole shoe 33 of the first sealing assembly 3 are both sleeved on the inner sleeve 5 and connected to the inner sleeve 5 through a first locking piece 34 to effectively prevent the first pole shoe 31 and the second pole shoe 33 of the first sealing assembly 3 from circumferentially rotating relative to the inner sleeve 5.

[0067] like Figure 1As shown, in some embodiments, the sealing device also includes an outer sleeve 6, which is matched with the chamber 11 and is at least partially sleeved on the first pole shoe 31 and the second pole shoe 33 of the second sealing assembly 4, and the first pole shoe 31 and the second pole shoe 33 of the second sealing assembly 4 are both connected to the outer sleeve 6 through the second locking piece 41, and the outer rotor 1 is sleeved on the outer sleeve 6 to effectively prevent the first pole shoe 31 and the second pole shoe 33 of the second sealing assembly 4 from circumferentially rotating relative to the outer sleeve 6.

[0068] It can be understood that the inner sleeve 5 and the outer sleeve 6 are both located in the chamber 11. The inner sleeve 5 and the outer sleeve 6 can both extend along the first direction.

[0069] Specifically, the inner sleeve 5 can be transitionally matched with the inner rotor 2. The outer sleeve 6 can be transitionally matched with the outer rotor 1. The first locking member 34 and the second locking member 41 are not limited to screws, such as countersunk screws, wherein threaded holes can be provided on the inner sleeve 5 and the outer sleeve 6, and through holes or threaded holes can be provided at corresponding positions on the pole shoes. The countersunk screws are passed through the through holes or threaded holes on the pole shoes and locked in the threaded holes of the inner sleeve 5 or the threaded holes of the outer sleeve 6, so that a reliable connection between the inner sleeve 5 and the pole shoes, or a reliable connection between the outer sleeve 6 and the pole shoes can be achieved, and later disassembly and maintenance are convenient.

[0070] It should be noted that the inner sleeve 5 and the outer sleeve 6 may both be made of non-magnetic conductive materials, or the inner sleeve 5 and the outer sleeve 6 may both be provided with non-magnetic conductive material coatings.

[0071] like Figure 1 , Figure 3 and Figure 4 As shown, in some embodiments, each of the first sealing assembly 3 and the second sealing assembly 4 has multiple permanent magnets 32 and is arranged at intervals along the circumference of the inner rotor 2, the outer circumferential surface of the inner sleeve 5 is provided with multiple first baffles 51, and the inner circumferential surface of the outer sleeve 6 is provided with multiple second baffles 61, the first baffles 51 and the second baffles 61 are spaced apart in the radial direction of the inner rotor 2, and each of the two opposite ends along the first direction respectively abuts against the corresponding first annular boss 314 and the corresponding second annular boss 331. In other words, the two opposite ends of the first baffle 51 along the first direction respectively abut against the first annular boss 314 and the second annular boss 331 of the first sealing assembly 3, and the two opposite ends of the second baffle 61 along the first direction respectively abut against the first annular boss 314 and the second annular boss 331 of the second sealing assembly 4.

[0072] The permanent magnet 32 ​​is an arc-shaped permanent magnet 32. The two opposite end surfaces of the permanent magnet 32 ​​of the first sealing component 3 along the circumferential direction of the inner rotor 2 are respectively abutted against a first baffle 51, and the two opposite end surfaces of the permanent magnet 32 ​​of the second sealing component 4 along the circumferential direction of the inner rotor 2 are respectively abutted against a second baffle 61. That is to say, the permanent magnet 32 ​​of the first sealing component 3 is limited between the two first baffles 51 along the circumferential direction of the inner rotor 2, and the permanent magnet 32 ​​of the second sealing component 4 is limited between the two second baffles 61 along the circumferential direction of the inner rotor 2.

[0073] It can be understood that the first baffle 51 can effectively prevent the permanent magnet 32 ​​of the first sealing assembly 3 and the inner sleeve 5 from rotating relative to each other, while the second baffle 61 can effectively prevent the permanent magnet 32 ​​of the second sealing assembly 4 and the outer sleeve 6 from rotating relative to each other.

[0074] Specifically, the permanent magnet 32 ​​of the first sealing assembly 3 can be sleeved on the inner sleeve 5, and the outer sleeve 6 can also be sleeved on the permanent magnet 32 ​​of the second sealing assembly 4. The outer circumference of the inner sleeve 5 can be integrally formed with a first baffle 51. The inner circumference of the outer sleeve 6 can be integrally formed with a second baffle 61.

[0075] Preferably, the multiple permanent magnets 32 of the first sealing assembly 3 are arranged at equal intervals along the circumference of the inner sleeve 5, and the multiple permanent magnets 32 of the second sealing assembly 4 are arranged at equal intervals along the circumference of the outer sleeve 6, so that the magnetic field at the sealing gap is evenly distributed along the circumference.

[0076] like Figure 1 As shown, in some embodiments, a first sealing ring is sandwiched between the outer circumferential surface of the inner rotor 2 and the inner circumferential surface of the inner sleeve 5, between the inner circumferential surface of at least one of the first pole shoe 31 and the second pole shoe 33 of the first sealing assembly 3 and the outer circumferential surface of the inner sleeve 5, between the outer circumferential surface of at least one of the first pole shoe 31 and the second pole shoe 33 of the second sealing assembly 4 and the inner circumferential surface of the outer sleeve 6, and between the outer circumferential surface of the outer sleeve 6 and the inner circumferential surface of the outer rotor 1. The first sealing ring can form a sealing structure between the aforementioned components to further ensure the sealing performance of the sealed medium.

[0077] For example, an annular groove 312 may be provided on the inner circumferential surface of the inner sleeve 5, the inner circumferential surface of at least one of the first pole shoe 31 and the second pole shoe 33 of the first sealing assembly 3, the outer circumferential surface of at least one of the first pole shoe 31 and the second pole shoe 33 of the second sealing assembly 4, and the outer circumferential surface of the outer sleeve 6, and the first sealing ring may be fitted in the annular groove 312 and abut against the circumferential surface of the adjacent components.

[0078] It should be noted that the specific specifications and shapes of the first sealing ring sandwiched between the aforementioned components can be designed accordingly according to the requirements of the aforementioned components. In other words, the specific structures and sizes of the first sealing rings on the aforementioned components are not necessarily the same.

[0079] like Figure 1 As shown, in some embodiments, the inner sleeve 5 and the outer sleeve 6 both have a first end and a second end opposite to each other along a first direction, the first end of the inner sleeve 5 abuts against the first pole shoe 31 of the first sealing assembly 3, and the second end of the inner sleeve 5 abuts against the second pole shoe 33 of the first sealing assembly 3.

[0080] The sealing device also includes a retaining spring 7, which is sleeved on the inner rotor 2 and abuts against the second pole shoe 33 of the first sealing assembly 3. The inner rotor 2 is provided with a shaft shoulder 21, and the first pole shoe 31 of the first sealing assembly 3 abuts against the shaft shoulder 21 to axially position the inner sleeve 5 and limit the first sealing assembly 3 in the chamber 11 along the first direction.

[0081] like Figure 1 As shown, in some embodiments, the first end of the outer sleeve 6 abuts against the first pole shoe 31 of the second sealing assembly 4 , and the second end of the outer sleeve 6 abuts against the second pole shoe 33 of the second sealing assembly 4 .

[0082] The sealing device also includes an end cover 8, which is connected to the outer rotor 1 and is suitable for sealing the chamber 11. The end cover 8 abuts against the second pole shoe 33 of the second sealing assembly 4. The inner circumferential surface of the outer rotor 1 is provided with a third annular boss 12. The first pole shoe 31 of the second sealing member abuts against the third annular boss 12 to axially position the outer sleeve 6 and limit the second sealing assembly 4 in the chamber 11 along the first direction.

[0083] Furthermore, the end cover 8 is threadedly connected to the outer rotor 1, which ensures the reliability of the connection between the two, facilitates the disassembly and assembly of the sealing device, and reduces the subsequent maintenance cost.

[0084] A gas turbine according to an embodiment of the present invention comprises a sealing device, a first rotor component and a second rotor component (not shown in the figure), wherein the sealing device is the sealing device of any of the above embodiments; an outer rotor 1 of the sealing device is located between the first rotor component and the second rotor component and is connected to each of the first rotor component and the second rotor component.

[0085] According to the gas turbine of the embodiment of the present invention, the sealing device is designed as a dual-magnetic source micro-nano magnetic medium sealing structure, which can shorten the magnetic circuit stroke, increase the magnetic field strength at the sealing gap, and improve the sealing performance of the sealing device under the high-speed working condition of the gas turbine. Therefore, compared with the related technology, the gas turbine using the sealing device can effectively improve the working efficiency.

[0086] Specifically, the outer rotor 1 may be connected to the first rotor component and the second rotor component by bolts.

[0087] It should be noted that the present invention is not limited to application in the sealing of the intermediate bearing cavity of a high-speed twin-rotor gas turbine, but may also be applicable to other occasions where there are high-speed twin-rotor seals.

[0088] Therefore, compared with the related art, the present invention has the following advantages:

[0089] 1) The first pole shoe 31, the second pole shoe 33 and the permanent magnet 32 ​​in the present invention all adopt a circumferential anti-rotation design, which can be used for concentric double rotor sealing of high-end equipment, and the process is simple, which broadens the application field of micro-nano magnetic medium sealing;

[0090] 2) The dual magnetic sources are used to shorten the magnetic circuit travel, increase the magnetic field strength at the sealing gap, and improve the pressure resistance of the sealing device;

[0091] 3) The centrifugal force generated by the high-speed rotating outer rotor 1 binds the micro-nano magnetic medium in the groove 312 of the non-magnetic conductive coating 313, preventing the radial movement of the micro-nano magnetic medium from causing the pressure resistance of the sealing device to decrease, and can be applied to high-speed rotating machinery.

[0092] like Figure 1 As shown, in some embodiments, a second sealing ring is sandwiched between at least one of the first rotor component and the second rotor component and the outer rotor 1, so that the second sealing ring seals the connecting gap between any one of the first rotor component and the second rotor component and the outer rotor 1.

[0093] It is understandable that a second sealing ring is sandwiched between the first rotor component and the outer rotor 1; or a second sealing ring is sandwiched between the second rotor component and the outer rotor 1; or a second sealing ring is sandwiched between both the first rotor component and the second rotor component and the outer rotor 1.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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 dual-magnetic source micro-nano magnetic medium sealing device, characterized in that: include: an outer rotor and an inner rotor, the outer rotor having a chamber, the inner rotor being pivotally connected to the chamber and at least partially located outside of the outer rotor; as well as A first sealing component and a second sealing component, the inner rotor, the first sealing component and the second sealing component are sequentially sleeved from the inside to the outside, the first sealing component and the second sealing component are both matched with the chamber and include a first pole shoe, a permanent magnet and a second pole shoe sequentially arranged along a first direction, the magnetic pole direction of the permanent magnet and the direction of the pivot axis of the inner rotor are both the first direction, the polarity of the permanent magnet of the first sealing component and the polarity of the permanent magnet of the second sealing component are opposite and are spaced apart in the radial direction of the inner rotor, and in the radial direction of the inner rotor, micro-nano magnetic media are adsorbed between the first pole shoe of the first sealing component and the first pole shoe of the second sealing component, and between the second pole shoe of the first sealing component and the second pole shoe of the second sealing component.

2. The dual-magnetic source micro-nano magnetic medium sealing device according to claim 1, characterized in that: The outer peripheral surface of each of the first pole shoe and the second pole shoe of the first sealing assembly is provided with a pole tooth, and the first pole shoe and the second pole shoe of the second sealing assembly are both provided with a groove corresponding to the pole tooth, and the micro-nano magnetic medium is adsorbed between the pole tooth and the groove; There are a plurality of pole teeth arranged at intervals along the first direction, and there are a plurality of grooves corresponding to the pole teeth one by one.

3. The dual-magnetic source micro-nano magnetic medium sealing device according to claim 2, characterized in that: The inner circumference of at least one of the first pole shoe and the second pole shoe of the second sealing assembly is provided with a non-magnetic coating, and the inner circumference of the non-magnetic coating is provided with a groove recessed toward the outer circumference of the non-magnetic coating, and the groove extends from the inner circumference of the non-magnetic coating to the outer circumference of the non-magnetic coating.

4. The dual magnetic source micro-nano magnetic medium sealing device according to any one of claims 1 to 3, characterized in that: The first pole shoe of each of the first sealing assembly and the second sealing assembly is provided with a first annular boss on the end surface adjacent to the second pole shoe, and the second pole shoe of each of the first sealing assembly and the second sealing assembly is provided with a second annular boss on the end surface adjacent to the first pole shoe, and the two opposite ends of the permanent magnet along the first direction are respectively abutted against the corresponding first annular boss and the corresponding second annular boss.

5. The dual-magnetic source micro-nano magnetic medium sealing device according to claim 4, characterized in that: The first annular shoulder of the first sealing assembly corresponds to the first annular shoulder of the second sealing assembly in the radial direction of the inner rotor, and the second annular shoulder of the first sealing assembly corresponds to the second annular shoulder of the second sealing assembly in the radial direction of the inner rotor; In the first direction, the distance between the first annular shoulder and the second annular shoulder of the first sealing component is equal to the distance between the first annular shoulder and the second annular shoulder of the second sealing component.

6. The dual-magnetic source micro-nano magnetic medium sealing device according to claim 5, characterized in that: Also includes: An inner sleeve, wherein the inner sleeve is sleeved on the inner rotor and matched with the chamber, and the first pole shoe and the second pole shoe of the first sealing assembly are sleeved on the inner sleeve and connected to the inner sleeve via a first locking member; and / or An outer sleeve, which is matched with the chamber and at least partially sleeved on the first pole shoe and the second pole shoe of the second sealing assembly, the first pole shoe and the second pole shoe of the second sealing assembly are both connected to the outer sleeve through a second locking piece, and the outer rotor is sleeved on the outer sleeve.

7. The dual-magnetic source micro-nano magnetic medium sealing device according to claim 6, characterized in that: Each of the first sealing assembly and the second sealing assembly has a plurality of permanent magnets which are arranged at intervals along the circumferential direction of the inner rotor, a plurality of first baffles are provided on the outer circumferential surface of the inner sleeve, and a plurality of second baffles are provided on the inner circumferential surface of the outer sleeve, the first baffles and the second baffles are spaced apart in the radial direction of the inner rotor, and opposite ends of each of the first baffles along the first direction are respectively in contact with the corresponding first annular boss and the corresponding second annular boss; The permanent magnet is an arc-shaped permanent magnet. The two opposite end surfaces of the permanent magnet of the first sealing assembly along the circumferential direction of the inner rotor are respectively abutted against one of the first baffles. The two opposite end surfaces of the permanent magnet of the second sealing assembly along the circumferential direction of the inner rotor are respectively abutted against one of the second baffles.

8. The dual-magnetic source micro-nano magnetic medium sealing device according to claim 6, characterized in that: The inner sleeve and the outer sleeve each have a first end and a second end opposite to each other along the first direction, the first end of the inner sleeve abuts against the first pole shoe of the first sealing assembly, and the second end of the inner sleeve abuts against the second pole shoe of the first sealing assembly; The sealing device further comprises a retaining spring, which is sleeved on the inner rotor and abuts against the second pole shoe of the first sealing assembly. The inner rotor is provided with a shaft shoulder, and the first pole shoe of the first sealing assembly abuts against the shaft shoulder.

9. The dual-magnetic source micro-nano magnetic medium sealing device according to claim 8, characterized in that: The first end of the outer sleeve abuts against the first pole shoe of the second sealing assembly, and the second end of the outer sleeve abuts against the second pole shoe of the second sealing assembly; The sealing device also includes an end cover, which is connected to the outer rotor and is suitable for sealing the chamber. The end cover abuts against the second pole shoe of the second sealing assembly. The inner circumferential surface of the outer rotor is provided with a third annular shoulder, and the first pole shoe of the second sealing component abuts against the third annular shoulder.

10. A gas turbine, characterized in that: include: A sealing device, wherein the sealing device is the sealing device according to any one of claims 1 to 9; as well as A first rotor component and a second rotor component, the outer rotor of the sealing device is located between the first rotor component and the second rotor component and is connected to each of the first rotor component and the second rotor component.

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