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

Abstract

The application 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 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 a chamber and each comprises a first pole shoe, a permanent magnet and a second pole shoe arranged in sequence 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 assembly is opposite to that of the permanent magnet of the second sealing assembly and is spaced apart in the radial direction of the inner rotor.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.The application shortens the magnetic circuit stroke by using double magnetic sources, increases the magnetic field strength at the sealing gap and improves the pressure resistance of the micro-nano magnetic media under high-speed working conditions.

Description

TECHNICAL FIELD

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

[0002] The micro-nano magnetic medium sealing is a sealing form that uses a magnetic field to constrain the micro-nano magnetic medium in a sealing gap and prevent the medium from leaking. It has the significant advantage of "zero leakage" compared with the traditional sealing.

[0003] In the related art, the intermediate bearing cavity of the double-rotor gas turbine mostly uses air injection sealing combined with floating ring sealing, and the air injection operation reduces the working efficiency of the gas turbine. If the micro-nano magnetic medium sealing is used for the bearing cavity sealing of the gas turbine, the working efficiency of the gas turbine can be effectively improved. However, the micro-nano magnetic medium sealing is mostly used for static sealing or low-speed dynamic sealing of single-rotor equipment, and the sealing performance for high-speed equipment is insufficient, so it cannot be applied to the intermediate bearing cavity sealing of high-speed double-rotor gas turbines. SUMMARY

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

[0005] To this end, an embodiment of one aspect of the present application proposes a double-magnetic-source micro-nano magnetic medium sealing device. The double-magnetic-source micro-nano magnetic medium sealing device uses double magnetic sources to shorten the magnetic circuit stroke, increases the magnetic field strength at the sealing gap, and improves the pressure resistance of the micro-nano magnetic medium under high-speed working conditions, so the sealing performance is good.

[0006] An embodiment of another aspect of the present application proposes a gas turbine.

[0007] According to the double-magnetic-source micro-nano magnetic medium sealing device of an embodiment of the present application, the outer rotor has a chamber, the inner rotor is pivotably connected with the chamber and at least partially located outside the outer rotor, the inner rotor, the first sealing assembly and the second sealing assembly are sequentially sleeved from inside to outside, the first sealing assembly and the second sealing assembly are both fitted in the chamber and include first pole shoes, permanent magnets and second pole shoes arranged in the first direction in sequence, the magnetic pole direction of the permanent magnets and the direction of the pivot axis of the inner rotor are both the first direction, the polarities of the permanent magnets of the first sealing assembly and the permanent magnets of the second sealing assembly are opposite and spaced apart in the radial direction of the inner rotor, and the first pole shoes of the first sealing assembly and the first pole shoes of the second sealing assembly and the second pole shoes of the first sealing assembly and the second pole shoes of the second sealing assembly are both adsorbed with micro-nano magnetic medium in the radial direction of the inner rotor.

[0008] The double-magnetic-source micro-nano magnetic medium sealing device according to the embodiment of the application is constructed by cooperating the first sealing assembly and the second sealing assembly, and a double-magnetic-source micro-nano magnetic medium sealing structure is constructed between the inner rotor and the outer rotor. 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. Since the polarity of the permanent magnet of the first sealing assembly is opposite to that of the permanent magnet of the second sealing assembly and the two permanent magnets are spaced apart in the radial direction of the inner rotor, the N pole of the permanent magnet of the second sealing assembly is located at the outer circumferential side of the S pole of the permanent magnet of the first sealing assembly, and the S pole of the permanent magnet of the second sealing assembly is located at the outer circumferential side of the N pole of the permanent magnet of the first sealing assembly. In the radial direction of the inner rotor, the first pole shoe of the first sealing assembly and the first pole shoe of the second sealing assembly and the second pole shoe of the first sealing assembly and the second pole shoe of the second sealing assembly are both adsorbed with the micro-nano magnetic medium. Therefore, a magnetic circuit is formed between the permanent magnets of the two sealing assemblies and the two pole shoes arranged in the radial direction of the inner rotor. Compared with the related art, the double-magnetic-source shortens the magnetic circuit stroke, increases the magnetic field strength at the sealing gap, and improves the pressure resistance of the micro-nano magnetic medium under high-speed working conditions, thereby improving the 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 pole tooth and the groove are adsorbed with the micro-nano magnetic medium.

[0010] The pole tooth has a plurality of and is arranged in the first direction, and the groove has a plurality of and corresponds to the pole tooth one by one.

[0011] In some embodiments, the inner circumferential surface 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, the inner circumferential surface of the non-magnetic coating is provided with the groove recessed towards the outer circumferential surface of the non-magnetic coating, and the groove extends from the inner circumferential surface of the non-magnetic coating to the outer circumferential surface 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 adjacent to the end surface of the second pole shoe, the second pole shoe of each of the first sealing assembly and the second sealing assembly is provided with a second annular shoulder adjacent to the end surface of the first pole shoe, and the opposite ends of the permanent magnet in the first direction respectively abut 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 assembly is equal to the distance between the first annular shoulder and the second annular shoulder of the second sealing assembly.

[0015] In some embodiments, the sealing device further comprises an inner sleeve, which is sleeved on the inner rotor and fitted in the chamber, and the first pole shoes and the second pole shoes of the first sealing assembly are both sleeved on the inner sleeve and connected to the inner sleeve by a first locking member.

[0016] In some embodiments, the sealing device further comprises an outer sleeve, which is fitted in the chamber and at least partially sleeved on the first pole shoes and the second pole shoes of the second sealing assembly, and the first pole shoes and the second pole shoes of the second sealing assembly are both connected to the outer sleeve by a second locking member, and the outer rotor is sleeved on the outer sleeve.

[0017] In some embodiments, the permanent magnets of each of the first sealing assembly and the second sealing assembly are multiple and arranged in a circumferential direction of the inner rotor, the outer circumferential surface of the inner sleeve is provided with multiple first baffles, the inner circumferential surface of the outer sleeve is provided with multiple second baffles, the first baffles and the second baffles are spaced apart in the radial direction of the inner rotor and each abuts against a corresponding first annular shoulder and a corresponding second annular shoulder at opposite ends in the first direction.

[0018] The permanent magnets are arc-shaped permanent magnets, the permanent magnets of the first sealing assembly abut against one of the first baffles at opposite ends in the circumferential direction of the inner rotor, and the permanent magnets of the second sealing assembly abut against one of the second baffles at opposite ends in the circumferential direction of the inner rotor.

[0019] In some embodiments, a first sealing ring is arranged 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 shoes and the second pole shoes 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 shoes and the second pole shoes 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 the first end in the first direction, the first end of the inner sleeve abuts against a first pole shoe of the first seal assembly, and the second end of the inner sleeve abuts against a second pole shoe of the first seal assembly.

[0021] The sealing device further comprises a circlip sleeved on the inner rotor and abutting against the second pole shoe of the first seal assembly, the inner rotor is provided with a shaft shoulder, the first pole shoe of the first seal 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 a first pole shoe of the second seal assembly, and the second end of the outer sleeve abuts against a second pole shoe of the second seal assembly.

[0023] The sealing device further comprises an end cover connected to the outer rotor and adapted to cover the cavity, the end cover abuts against the second pole shoe of the second seal assembly, an inner circumferential surface of the outer rotor is provided with a third annular shoulder, and the first pole shoe of the second seal assembly abuts against the third annular shoulder to axially position the outer sleeve.

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

[0025] The sealing device is designed as a double-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 high-speed working conditions of the gas turbine, so that the gas turbine using the sealing device can effectively improve the working efficiency compared with the related art.

[0026] In some embodiments, at least one of the first rotor component and the second rotor component and the outer rotor are clamped with a second sealing ring to seal the connection 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 application will be given in part in the following description, become apparent from the following description, or be understood through practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a structural schematic view of a double-magnetic-source micro-nano magnetic medium sealing device according to an embodiment of the present application.

[0029] Figure 2 is Figure 1 a partial enlarged structural schematic view in the figure.

[0030] Figure 3 is a schematic view of the connection structure between the permanent magnet of the first sealing assembly and the inner shaft sleeve in the double magnetic source micro-nano magnetic medium sealing device according to the embodiment of the application.

[0031] Figure 4 is a schematic view of the connection structure between the permanent magnet of the second sealing assembly and the outer shaft sleeve in the double magnetic source micro-nano magnetic medium sealing device according to the embodiment of the application.

[0032] Figure 5 is a schematic view of the structure of the double magnetic source micro-nano magnetic medium sealing device under high-speed rotating working condition according to the embodiment of the application.

[0033] Figure 6 is Figure 5 a partial enlarged structural schematic view in the figure.

[0034] Reference signs:

[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 coating; 314, first annular shoulder; 32, permanent magnet; 33, second pole shoe; 331, second annular shoulder; 34, first locking member;

[0038] 4, second sealing assembly; 41, second locking member;

[0039] 5, inner shaft sleeve; 51, first baffle;

[0040] 6, outer shaft sleeve; 61, second baffle;

[0041] 7, clasp spring;

[0042] 8, end cover. DETAILED DESCRIPTION

[0043] The embodiments of the application are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the application, and cannot be understood as a limitation of the application.

[0044] As Figures 1 to 6As shown, the double-magnetic-source micro-nano magnetic medium sealing device of the embodiment of the present application comprises an outer rotor 1, an inner rotor 2, a first sealing assembly 3 and a second sealing assembly 4. The outer rotor 1 has a cavity 11. The inner rotor 2 is pivotably connected to the cavity 11 and 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 inside to outside. The first sealing assembly 3 and the second sealing assembly 4 are both fitted in the cavity 11 and comprise first pole shoes 31, permanent magnets 32 and second pole shoes 33 arranged in the first direction in sequence. The magnetic pole direction of the permanent magnet 32 and the direction of the pivot axis of the inner rotor 2 are both the first direction. The polarity of the permanent magnet 32 of the first sealing assembly 3 is opposite to that of the permanent magnet 32 of the second sealing assembly 4 and is spaced apart in the radial direction of the inner rotor 2. In the radial direction of the inner rotor 2, the first pole shoes 31 of the first sealing assembly 3 and the first pole shoes 31 of the second sealing assembly 4 and the second pole shoes 33 of the first sealing assembly 3 and the second pole shoes 33 of the second sealing assembly 4 are both adsorbed with micro-nano magnetic medium.

[0045] The double-magnetic-source micro-nano magnetic medium sealing device according to the embodiment of the present application is constructed between the inner rotor 2 and the outer rotor 1 by the cooperation of the first sealing assembly 3 and the second sealing assembly 4 which are sleeved. 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 in the first direction. Since the polarity of the permanent magnet 32 of the first sealing assembly 3 is opposite to that of the permanent magnet 32 of the second sealing assembly 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 assembly 4 is located at the outer circumferential side of the S pole of the permanent magnet 32 of the first sealing assembly 3, and the S pole of the permanent magnet 32 of the second sealing assembly 4 is located at the outer circumferential side of the N pole of the permanent magnet 32 of the first sealing assembly 3. In the radial direction of the inner rotor 2, the first pole shoes 31 of the first sealing assembly 3 and the first pole shoes 31 of the second sealing assembly 4 and the second pole shoes 33 of the first sealing assembly 3 and the second pole shoes 33 of the second sealing assembly 4 are both adsorbed with micro-nano magnetic medium. Therefore, a magnetic circuit can be formed between the permanent magnets 32 of the two sealing assemblies and the two pole shoes arranged in the radial direction of the inner rotor 2. Compared with the related art, the present application shortens the magnetic circuit stroke by using double magnetic sources, 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.

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

[0047] For example, in the figure, along the first direction, the part of the permanent magnet 32 of the first sealing assembly 3 adjacent to the first pole shoe 31 can be S-pole, and the remaining part can be N-pole, while the part of the permanent magnet 32 of the second sealing assembly 4 adjacent to the first pole shoe 31 can be N-pole, and the remaining part can be S-pole. At this time, the magnetic circuit of the double-magnetic-source micro-nano magnetic medium sealing structure is:

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

[0049] Magnetic circuit two: the magnetic field emitted from the N-pole of the permanent magnet 32 of the second sealing assembly 4 passes through the first pole shoe 31 of the second sealing assembly 4, the first pole shoe 31 of the first sealing assembly 3 and returns to the S-pole of the permanent magnet 32 of the first sealing assembly 3 in sequence.

[0050] Therefore, compared with the magnetic circuit of the micro-nano magnetic medium sealing structure in the related art, which is that the magnetic field emitted from 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 and returns to the S-pole of the permanent magnet 32 in sequence, the present application forms the magnetic circuit only between the permanent magnet 32 and the two pole shoes, so as to effectively shorten the magnetic circuit stroke, thereby enhancing the magnetic field strength of the first sealing assembly 3 and the second sealing assembly 4 at the sealing gap.

[0051] It should be noted that the outer rotor 1 and the inner rotor 2 can be made of non-magnetic conductive material, or the outer rotor 1 and the inner rotor 2 can be provided with a non-magnetic conductive material coating.

[0052] For example, 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 assembly 3 is provided with a pole tooth 311, and the first pole shoe 31 and the second pole shoe 33 of the second sealing assembly 4 are both provided with a groove 312 corresponding to the pole tooth 311. 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 in the radial direction of the inner rotor 2 under high-speed conditions, it can be confined in the groove 312 by the centrifugal force generated by the high-speed rotating outer rotor 1, thereby not being easily blown away in the first direction by the sealed medium, thereby avoiding the problem of radial movement of the micro-nano magnetic medium causing a decrease in the pressure resistance of the sealing device. In other words, the groove 312 structure designed on the first pole shoe 31 and the second pole shoe 33 of the second sealing assembly 4 can confine 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 impact of the centrifugal force on the pressure resistance of the sealing device.

[0053] There are multiple pole teeth 311 and they are arranged at intervals along the first direction. There are multiple grooves 312 and they correspond one-to-one to the pole teeth 311. The cooperation between the multiple pole teeth 311 and the 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 arrangement of the pole teeth 311 will generate 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 enable the micro-nano magnetic medium to generate magnetic force under the action of the non-uniform magnetic field. 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, thereby achieving 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 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 members, and the groove 312 is not coated with the non-magnetic conductive coating 313, that is, the groove 312 is magnetically conductive, after the inner circumferential surface of at least one of the first pole shoe 31 and the second pole shoe 33 of the second sealing assembly 4 is coated with the non-magnetic conductive coating 313, the magnetic flux path will only be formed between the groove 312 and the corresponding pole tooth 311 between the pole shoes coated with the non-magnetic conductive coating 313 in the first sealing assembly 3 and the second sealing assembly 4 at this time, the micro-nano magnetic medium is bound between the groove 312 and the corresponding pole tooth 311 under the action of the magnetic force, and cannot flow in 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 assembly 4 is provided with the non-magnetic conductive coating 313; or, the inner circumferential surface of the second pole shoe 33 of the second sealing assembly 4 is provided with the non-magnetic conductive 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 assembly 4 is provided with the non-magnetic conductive 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 the non-magnetic conductive coating 313, so as to further make the micro-nano magnetic medium sealing of the sealing device resistant to high speed.

[0060] It should be noted that the thickness of the non-magnetic conductive coating 313 (that is, the distance from the inner circumferential surface to the outer circumferential surface of the non-magnetic conductive coating 313) is specifically determined according to the condition that the micro-nano magnetic medium can be reliably bound between the groove 312 and the corresponding pole tooth 311, and the rotation of the inner rotor 2 and the outer rotor 1 is not affected, which will not be expanded here.

[0061] As shown in FIG. 1, Figure 1 In some embodiments, the first pole shoe 31 of each of the first sealing assembly 3 and the second sealing assembly 4 is provided with a first annular shoulder 314 adjacent to the end surface of the second pole shoe 33, the second pole shoe 33 of each of the first sealing assembly 3 and the second sealing assembly 4 is provided with a second annular shoulder 331 adjacent to the end surface of the first pole shoe 31, and the opposite ends of the permanent magnet 32 along the first direction respectively abut against the corresponding first annular shoulder 314 and the corresponding second annular shoulder 331, wherein the first pole shoe 31 and the second pole shoe 33 can realize the axial positioning of the permanent magnet 32, and the first annular shoulder 314 and the second annular shoulder 331 can realize the radial positioning of the permanent magnet 32.

[0062] As shown in FIG. 1, Figure 1As shown, in some embodiments, the first annular shoulder 314 of the first sealing assembly 3 corresponds to the first annular shoulder 314 of the second sealing assembly 4 in the radial direction of the inner rotor 2, and the second annular shoulder 331 of the first sealing assembly 3 corresponds to the second annular shoulder 331 of the second sealing assembly 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 assembly 3 is consistent with the position of the first annular shoulder 314 of the second sealing assembly 4, and the position of the second annular shoulder 331 of the first sealing assembly 3 is consistent with the position of the second annular shoulder 331 of the second sealing assembly 4. Therefore, the position of the permanent magnet 32 ​​of the first sealing assembly 3 in the first direction is consistent with the position of the permanent magnet 32 ​​of the second sealing assembly 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] Furthermore, the first pole piece 31 and the second pole piece 33 of the first sealing assembly 3 are arranged in mirror-symmetric arrangement with respect to a first reference plane, and the first pole piece 31 and the second pole piece 33 of the second sealing assembly 4 are arranged in mirror-symmetric arrangement with respect to a 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 ​​in each of the first sealing assembly 3 and the second sealing assembly 4 is coplanar with the first reference plane, that is, the north pole and the south pole of the permanent magnet 32 ​​are mirror-symmetric with respect to the first reference plane. The aforementioned structural design achieves reliable and stable sealing between the first sealing assembly 3 and the second sealing assembly 4 between the inner rotor 2 and the outer rotor 1.

[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. 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 member 34 to effectively prevent the first pole shoe 31 and the second pole shoe 33 of the first sealing assembly 3 from rotating circumferentially relative to the inner sleeve 5.

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

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

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

[0071] As shown in some embodiments, Figure 3 , Figure 4 and Figure 1 As shown in some embodiments, the permanent magnets 32 of each of the first sealing assembly 3 and the second sealing assembly 4 are multiple and 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, 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 end opposite in the first direction is respectively abutted with the corresponding first annular shoulder 314 and the corresponding second annular shoulder 331, in other words, the two ends opposite in the first direction of the first baffles 51 are respectively abutted with the first annular shoulder 314 and the second annular shoulder 331 of the first sealing assembly 3, and the two ends opposite in the first direction of the second baffles 61 are respectively abutted with the first annular shoulder 314 and the second annular shoulder 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 assembly 3 along the circumferential direction of the inner rotor 2 respectively abut against a first baffle 51, and the two opposite end surfaces of the permanent magnet 32 ​​of the second sealing assembly 4 along the circumferential direction of the inner rotor 2 respectively abut against a second baffle 61. In other words, the permanent magnet 32 ​​of the first sealing assembly 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 assembly 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 circumferential surface of the inner sleeve 5 can be integrally formed with a first baffle 51. The inner circumferential surface 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 structure and size of the first sealing ring on the aforementioned components are not necessarily the same.

[0079] As shown in the drawings, Figure 1 In some embodiments, the inner sleeve 5 and the outer sleeve 6 each have a first end and a second end opposite in the 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 further comprises a circlip 7 sleeved on the inner rotor 2 and abutting against the second pole shoe 33 of the first sealing assembly 3, the inner rotor 2 is provided with a shaft shoulder 21, 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 cavity 11 in the first direction.

[0081] As shown in the drawings, Figure 1 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 further comprises an end cover 8 connected with the outer rotor 1 and adapted to cover the cavity 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 shoulder 12, and the first pole shoe 31 of the second sealing assembly 4 abuts against the third annular shoulder 12 to axially position the outer sleeve 6 and limit the second sealing assembly 4 in the cavity 11 in the first direction.

[0083] Further, the end cover 8 is threadedly connected with the outer rotor 1, ensuring the connection reliability between the two, facilitating the disassembly of the sealing device and reducing the later maintenance cost.

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

[0085] The gas turbine according to the embodiment of the present application designs the sealing device as a double-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 high-speed working conditions of the gas turbine, so that the gas turbine adopting the sealing device can effectively improve the working efficiency compared with the related art.

[0086] Specifically, the outer rotor 1 can be connected with the first rotor component and the second rotor component through bolts.

[0087] It should be noted that the present application is not limited to be applied in the intermediate bearing cavity sealing of the high-speed double-rotor gas turbine, but can also be applied in other occasions where high-speed double-rotor sealing exists.

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

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

[0090] 2) The double magnetic sources are adopted to shorten the magnetic circuit stroke, 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 coating 313, prevents the micro-nano magnetic medium from moving radially to cause the pressure resistance of the sealing device to decrease, and can be applied to high-speed rotating machinery.

[0092] As shown in ​ In some embodiments, a second sealing ring is arranged between at least one of the first rotor component and the second rotor component and the outer rotor 1, so as to seal the connection gap between any one of the first rotor component and the second rotor component and the outer rotor 1 by the second sealing ring.

[0093] It can be understood that the second sealing ring is arranged between the first rotor component and the outer rotor 1, or the second sealing ring is arranged between the second rotor component and the outer rotor 1, or the second sealing ring is arranged between the first rotor component and the outer rotor 1 and between the second rotor component and the outer rotor 1.

[0094] 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”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential” are based on the orientation or positional relationship shown in the drawings, and are 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.

[0095] 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 indicated technical features. 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.

[0096] In the present application, unless specifically defined otherwise, the terms "mounting", "connected", "connecting", "fixed", "fixedly connected", "connection", "fixedly connected", "connected", "fixed", and the like should be construed broadly, for example, can be fixed connection, can be detachable connection, or integral; can be mechanical connection, can be electrical connection or communication with each other; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. 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.

[0097] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature can be 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, the first feature "on", "above" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0098] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.

[0099] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and cannot be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

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 the outer rotor; as well as a first sealing assembly and a second sealing assembly, wherein 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 fitted into 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 in 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 they are spaced apart in the radial direction of the inner rotor; and a 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 in the radial direction of the inner rotor; The outer circumference 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; 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.

2. The dual-magnetic source micro-nano magnetic medium sealing device according to claim 1, 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 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 in contact with the corresponding first annular shoulder and the corresponding second annular shoulder.

3. The dual-magnetic-source micro-nano magnetic medium sealing device according to claim 2, 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, a distance between the first annular shoulder and the second annular shoulder of the first sealing assembly is equal to a distance between the first annular shoulder and the second annular shoulder of the second sealing assembly.

4. The dual-magnetic-source micro-nano magnetic medium sealing device according to claim 3, characterized in that: Also includes: an inner sleeve, the inner sleeve being sleeved on the inner rotor and fitting into the chamber, the first pole shoe and the second pole shoe of the first sealing assembly both being sleeved on the inner sleeve and connected to the inner sleeve via a first locking member; and / or An outer sleeve is fitted into 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 member, and the outer rotor is sleeved on the outer sleeve.

5. The dual-magnetic-source micro-nano magnetic medium sealing device according to claim 4, characterized in that: Each of the first sealing assembly and the second sealing assembly has a plurality of permanent magnets that are spaced apart along the circumference of the inner rotor; a plurality of first baffles are provided on the outer circumference of the inner sleeve, and a plurality of second baffles are provided on the inner circumference 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 baffle along the first direction abut against a corresponding first annular shoulder and a corresponding second annular shoulder, respectively; The permanent magnet is an arc-shaped permanent magnet. The permanent magnet of the first sealing assembly abuts against one of the first baffles at two opposite end surfaces along the circumference of the inner rotor, and the permanent magnet of the second sealing assembly abuts against one of the second baffles at two opposite end surfaces along the circumference of the inner rotor.

6. The dual-magnetic source micro-nano magnetic medium sealing device according to claim 4, 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 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.

7. The dual-magnetic-source micro-nano magnetic medium sealing device according to claim 6, 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 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 assembly abuts the third annular shoulder.

8. 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 7; as well as a first rotor component and a second rotor component, the outer rotor of the sealing device being located between the first rotor component and the second rotor component and being connected to each of the first rotor component and the second rotor component.

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