Gas turbine high speed shaft self-adapting non-eccentric coupling

Abstract

The application provides a gas turbine high-speed shaft self-adaptive eccentricity-free coupling device, which comprises a first coupling shaft and a second coupling shaft, wherein the second coupling shaft extends into the outer shell of the first coupling shaft, an outer ring cylinder magnet and an inner ring cylinder magnet are arranged in the gap between the second coupling shaft and the first coupling shaft, the inner ring cylinder magnet is non-rotatably sleeved on the second coupling shaft, the outer ring cylinder magnet is non-rotatably embedded in the first coupling shaft, and the inner ring cylinder magnet and the outer ring cylinder magnet are gap-fitted and sleeved together; in operation, the two shafts are coupled by the permanent magnets, the eccentricity of the shaft is self-adaptively adjusted by the non-rigid coupling of the magnetic force, the problem of the reduction of the fatigue life of the shaft caused by the eccentricity is solved, and based on the combined structure of the novel permanent magnet coupling device, the rigid coupling and the flexible coupling can be coupled, and greater torque can be transmitted.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of gas turbines, the technical field of gas turbine parts and shaft couplings, and particularly relates to a self-adaptive eccentricity-free coupling for a high-speed shaft of a gas turbine. BACKGROUND

[0002] In the patent document "Gas turbine eccentricity compensation air float bearing", it is mentioned that the power shaft of a gas turbine rotates at a high speed for a long time, and therefore the concentricity requirement of the downstream shaft connected thereto is much higher than that of ordinary power equipment. A small amount of eccentricity will greatly reduce the fatigue life of the shaft during continuous high-speed rotation. However, eccentricity is inevitable due to manufacturing and assembly tolerances. At present, the problem of eccentricity compensation for high-speed shafts in gas turbines has not been paid enough attention.

[0003] However, in the air float bearing, the eccentricity is partially compensated due to the non-constant force of the shaft and the problem of air pressure fluctuation. The eccentricity value is reduced, but the eccentricity problem cannot be completely overcome. The effect is good when used for positioning gas turbine blades under certain working conditions. However, when the shaft of the gas turbine is connected to the downstream load shaft, the use of multiple air float bearings in parallel will inevitably cause a small amount of eccentricity to change unpredictably and significantly in value. It is difficult to achieve the control effect expected by technicians. SUMMARY

[0004] In view of the above technical status, the application provides a self-adaptive eccentricity-free coupling for a high-speed shaft of a gas turbine. In operation, the coupling connects two shafts through permanent magnets, and uses the non-rigid connection of magnetic force to self-adaptively adjust the eccentricity of the shaft, thereby solving the problem of reduced fatigue life of the shaft caused by eccentricity. Moreover, since traditional permanent magnet couplings are flexible, the application further provides a new combined structure that couples rigid connection and flexible connection, thereby being able to transmit greater torque.

[0005] The technical solution adopted by the application is as follows: a self-adaptive eccentricity-free coupling for a high-speed shaft of a gas turbine, comprising a first coupling shaft and a second coupling shaft, wherein the second coupling shaft extends into the outer shell of the first coupling shaft,

[0006] The gap between the second linkage shaft and the first linkage shaft is fitted with an outer ring cylinder magnet and an inner ring cylinder magnet, the inner ring cylinder magnet is non-rotatably sleeved on the second linkage shaft, the outer ring cylinder magnet is non-rotatably embedded in the first linkage shaft, and the inner ring cylinder magnet and the outer ring cylinder magnet are gap-fitted together; the inner circumferential surface of the outer ring cylinder magnet is arrayed with a plurality of permanent magnets in a radially inward manner, and the outer circumferential surface of the inner ring cylinder magnet is arrayed with a plurality of permanent magnets in a radially outward manner; each permanent magnet of the inner ring cylinder magnet is inserted into the gap between two adjacent permanent magnets of the outer ring cylinder magnet, and each permanent magnet of the outer ring cylinder magnet is also inserted into the gap between two adjacent permanent magnets of the inner ring cylinder magnet.

[0007] In the same plane perpendicular to the axis in the coupling, the permanent magnets of the outer ring cylinder magnet and the permanent magnets of the inner ring cylinder magnet are arranged in a ring shape with a spacing between each other, the N pole and the S pole of each permanent magnet are in the left-right direction, and the adjacent faces between every two adjacent permanent magnets have the same magnetic pole; the magnetic circuit of each ring of permanent magnets arranged in the plane is closed in the annular space containing the ring of permanent magnets.

[0008] The first rigid linkage gear of the outer gear type structure is fixedly arranged on the second linkage shaft, the end cover of the inner gear type structure matched with the first rigid linkage gear is fixedly arranged on the first linkage shaft, the end cover and the first rigid linkage gear form a tooth groove matching, and the gap width between the teeth of the end cover and the teeth of the first rigid linkage gear is smaller than the gap width between the adjacent permanent magnets of the outer ring cylinder magnet and the inner ring cylinder magnet.

[0009] Specifically, the outer ring cylinder magnet includes a plurality of outer positioning copper rings and a plurality of outer ring copper plates which are spaced and stacked together, and the upper surface and the lower surface of the outer ring cylinder magnet are covered by one outer ring copper plate respectively, the inner circumferential surface of the outer positioning copper ring is provided with a plurality of clamping grooves arranged in a circumferential array, and one permanent magnet is embedded in each clamping groove of the inner circumferential surface of the outer positioning copper ring; the inner ring cylinder magnet includes a plurality of inner positioning copper rings and a plurality of inner ring copper plates which are spaced and stacked together, and the upper surface and the lower surface of the inner ring cylinder magnet are covered by one inner ring copper plate respectively, the outer circumferential surface of the inner positioning copper ring is provided with a plurality of clamping grooves arranged in a circumferential array, and one permanent magnet is embedded in each clamping groove of the outer circumferential surface of the inner positioning copper ring, and the number of the permanent magnets is the same as the number of the permanent magnets in the inner circumferential surface of each outer positioning copper ring; for example, nine permanent magnets are embedded in the inner circumferential surface of each outer positioning copper ring, and nine permanent magnets are embedded in the outer circumferential surface of each inner positioning copper ring; the number of the outer positioning copper rings and the inner positioning copper rings is the same and is not less than four, for example, six are arranged.

[0010] The magnetic circuit of each ring of permanent magnets arranged in a ring in a plane is enclosed in the ring-shaped space accommodating the ring of permanent magnets, which refers to the ring-shaped space enclosing the magnetic circuit of the ring of permanent magnets arranged in a ring, which is jointly formed by the inner positioning copper ring, the outer positioning copper ring, the two inner ring copper plates, and the two outer ring copper plates. In a specific structure, the shape of the outer ring copper plate can be the same as the cross-sectional shape of the outer positioning copper ring inlaid with permanent magnets, and the shape of the inner ring copper plate can be the same as the cross-sectional shape of the inner positioning copper ring inlaid with permanent magnets. Of course, as long as the outer ring copper plate and the inner ring copper plate can cover the inner and outer corresponding sets of inner positioning copper rings and outer positioning copper rings to form a ring-shaped space accommodating permanent magnets after being spliced together.

[0011] Further, the above-mentioned non-rotatable connection can adopt a key slot connection mode, for example, the outer circumferential surface of the outer positioning copper ring is also provided with a clamping groove, which cooperates with the inner circumferential surface of the first linkage shaft to form a key slot to limit the relative rotation of the two; the inner circumferential surface of the inner positioning copper ring is also provided with a clamping groove, which cooperates with the outer circumferential surface of the second linkage shaft to form a key slot to limit the relative rotation of the two. It is easy to think that it can also directly adopt a screw locking relative rotation mode to realize the non-rotatable connection.

[0012] Further, the second linkage shaft includes a main shaft body, the outer circumferential surface of the main shaft body is provided with a key slot structure, a first rigid linkage gear is fixedly arranged at one end of the main shaft body, and a second rigid linkage gear is fixedly arranged on the other end surface of the main shaft body, for example, the other end surface of the main shaft body is provided with a bolt hole, and the second rigid linkage gear is fixedly installed on the end surface by cooperating with the bolt hole through a fixing bolt; the combination structure of the outer ring cylinder magnet and the inner ring cylinder magnet is sleeved on the main shaft body and is locked from axial displacement by the first rigid linkage gear and the second rigid linkage gear. The second linkage shaft further includes a second flange and a positioning shaft, the second flange is fixedly connected to the end of the main shaft body provided with the first rigid linkage gear, and the positioning shaft extends axially from the end surface of the main shaft body on which the second rigid linkage gear is installed, and the positioning shaft extends into the center through hole of the first linkage shaft in clearance fit.

[0013] The end of the combined structure of the outer ring cylinder magnet and the inner ring cylinder magnet inside the first linkage shaft has a steel ring and a plurality of steel blocks, the steel ring is arranged non-rotatably inside the first linkage shaft, and the plurality of steel blocks are uniformly inlaid on the inner circumferential surface of the steel ring; the combined structure of the steel ring and the plurality of steel blocks is in gear slot cooperation with the second rigid linkage gear, and the teeth of the second rigid linkage gear and the side surfaces of the adjacent steel blocks have a gap width, the gap width is the same as the gap width between the teeth of the end cover and the teeth of the first rigid linkage gear and corresponds to the axial position, so that the first rigid linkage gear and the second rigid linkage gear synchronously act at the two ends of the main shaft body respectively, rigid starting of the coupling is completed by first hard contact, and collision between the permanent magnets is avoided.

[0014] Further, the first linkage shaft is composed of an outer shell, a first flange and an end cover, the outer shell is a cylinder shell structure with one end being open, the outer ring cylinder magnet and the inner ring cylinder magnet are accommodated inside the cylinder shell structure, and the open end is fixedly installed with the end cover, and the first flange is fixedly connected to the non-open end of the outer shell.

[0015] Further, the first rigid linkage gear, the second rigid linkage gear and the end cover are made of steel or hard alloy material.

[0016] The technical scheme of the present application has the following advantages:

[0017] 1. The small deviation degree of the two pairs of shafts can be automatically adapted, the long-time and high-speed stable rotation of the gas turbine shaft is ensured, and the problem of easy fatigue failure of the shaft caused by eccentricity due to manufacturing and assembly tolerance is prevented.

[0018] 2. The traditional permanent magnet coupling is divided into two types: one is the magnetic force connection of the adjacent side surfaces of two disc bodies, and the other is that a small disc body is inserted into the wrapping range of a large disc body, so that the outer circumferential surface of the small disc body is magnetically connected with the inner circumferential surface of the large disc body; the couplings of the two types are pure flexible connection, the torque that can be transmitted is relatively small, and there is a problem of disc surface wear. The high-speed shaft self-adapting non-eccentric coupling of the gas turbine of the present application is rigid linkage at the time of starting, and is flexible linkage when running stably after starting, the eccentricity of the two shafts is self-adapted through magnetic force, the influence of eccentricity is completely overcome, and the rigid linkage and the flexible linkage are coupled together, so that the demand of larger torque transmission can be met. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a combined state structure schematic view of the coupling of the present application;

[0020] Figure 2 is a split schematic view of the coupling of the present application Figure 1 ;

[0021] Figure 3is the split schematic of the coupling of the present application Figure 2 ;

[0022] Figure 4 is the split schematic of the structure of the outer ring cylinder magnet of the coupling of the present application;

[0023] Figure 5 is the split schematic of the structure of the inner ring cylinder magnet of the coupling of the present application;

[0024] Figure 6 is the schematic diagram of the combined state of the inner and outer ring cylinder magnets of the coupling of the present application;

[0025] Figure 7 is the schematic diagram of the second linkage shaft structure of the coupling of the present application;

[0026] Figure 8 is the split schematic of the second linkage shaft structure of the coupling of the present application;

[0027] Figure 9 is the schematic diagram of the first linkage shaft structure of the coupling of the present application;

[0028] Figure 10 is the schematic diagram of the magnetic circuit in the combined state of the magnetic poles of the coupling of the present application;

[0029] Figure 11 is the schematic diagram of the application example of the coupling of the present application;

[0030] In the figure: 1, first linkage shaft, 1-1, first flange, 1-2, end cover, 1-3, first key groove;

[0031] 2, second linkage shaft, 2-1, main shaft body, 2-2, first rigid linkage gear, 2-3, second flange, 2-4, bolt hole, 2-5, positioning shaft, 2-6, fixing bolt;

[0032] 3, second rigid linkage gear;

[0033] 4, outer ring cylinder magnet, 4-1, outer positioning copper ring, 4-2, outer ring copper plate;

[0034] 5, inner ring cylinder magnet, 5-1, inner positioning copper ring, 5-2, inner ring copper plate;

[0035] 6, permanent magnet, 7, steel ring, 8, steel block, 9, load. DETAILED DESCRIPTION

[0036] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0037] In the description of the present application, it is to be understood by those skilled in the art that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like are for the convenience of description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0038] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or it can be the communication inside two elements. 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.

[0039] Figure 1 is a combined state structure schematic diagram of the coupling of the present application, which includes a first linkage shaft 1 and a second linkage shaft 2, respectively used for fixedly connecting the driving shaft and the driven shaft. Figure 2 and Figure 3 The structure of the gas turbine high-speed shaft self-adaptive eccentricity-free coupling of the present application is shown in a progressive disassembly manner, the second linkage shaft 2 extends into the housing of the first linkage shaft 1, an outer ring cylinder magnet 4 and an inner ring cylinder magnet 5 are assembled in the gap between the second linkage shaft 2 and the first linkage shaft 1, the inner ring cylinder magnet 5 is non-rotatably sleeved on the second linkage shaft 2, the outer ring cylinder magnet 4 is non-rotatably embedded in the first linkage shaft 1, and the outer ring cylinder magnet 4 and the inner ring cylinder magnet 5 are sleeved together with a relative rotation gap, and the overall outer diameter size of the inner ring cylinder magnet 5 is slightly smaller than the inner diameter size of the outer ring cylinder magnet 4, that is, the inner ring cylinder magnet 5 and the outer ring cylinder magnet 4 are gap-fitted together. See Figure 3 The end of the second linkage shaft 2 is fixedly connected with a second rigid linkage gear 3, which locks the axial movement range of the combined structure of the outer ring cylinder magnet 4 and the inner ring cylinder magnet 5.

[0040] See Figure 4, is the structure split schematic view of the outer ring cylinder magnet of the coupling, the outer ring cylinder magnet comprises a plurality of outer positioning copper rings 4-1 and a plurality of outer ring copper plates 4-2 which are spaced and stacked together, and the upper surface and the lower surface of the outer ring cylinder magnet are covered by one outer ring copper plate 4-2 respectively, the inner peripheral surface and the outer peripheral surface of the outer positioning copper ring 4-1 are provided with circumferentially arrayed clamping grooves, the clamping grooves of the outer peripheral surface form key groove cooperation with the inner peripheral surface of the first linkage shaft 1 to limit the relative rotation of the two, one permanent magnet 6 is embedded in each clamping groove of the inner peripheral surface, in the embodiment shown in the drawing, nine permanent magnets are uniformly embedded in the inner peripheral surface of each outer positioning copper ring 4-1, of course, it can also be provided as other quantities, the outer ring copper plate 4-2 on the two side surfaces of each outer positioning copper ring 4-1 covers the permanent magnet 6, that is, the annular space formed by the outer positioning copper ring 4-1 and the outer ring copper plate 4-2 encloses the outer peripheral part and the magnetic circuit of the upper and lower side surfaces of the permanent magnet 6. The outer peripheral surfaces of the plurality of outer positioning copper rings 4-1 and the plurality of outer ring copper plates 4-2 are all matched together with the inner peripheral surface key groove of the first linkage shaft 1 to limit the rotation of the whole outer ring cylinder magnet relative to the first linkage shaft 1.

[0041] Figure 5 , is the structure split schematic view of the inner ring cylinder magnet of the coupling, as shown in the figure, the inner ring cylinder magnet 5 comprises a plurality of inner positioning copper rings 5-1 and inner ring copper plates 5-2 which are spaced and stacked together, and the upper surface and the lower surface of the inner ring cylinder magnet are covered by one inner ring copper plate 5-2 respectively, the inner peripheral surface and the outer peripheral surface of the inner positioning copper ring 5-1 are provided with circumferentially arrayed clamping grooves, one permanent magnet 6 is embedded in each clamping groove of the outer peripheral surface of the inner positioning copper ring 5-1, and the number is the same as that of the permanent magnets 6 in the inner peripheral surface of each outer positioning copper ring 4-1 in the outer ring cylinder magnet; the inner ring copper plate 5-2 on the two side surfaces of each inner positioning copper ring 5-1 covers the permanent magnet 6 on the outer peripheral surface, that is, the outer peripheral surface of the permanent magnet 6 and the magnetic circuit of the upper and lower side surfaces in the inner ring cylinder magnet are blocked by the annular space formed by the inner positioning copper ring 5-1 and the inner ring copper plate 5-2 on the two side surfaces. Referring to Figure 4 and Figure 5 , the permanent magnets 6 in the inner ring cylinder magnet 5 are arrayed and distributed on the outer peripheral surface of the inner ring cylinder magnet 5 in a way of spacing each other outwardly, the permanent magnets 6 in the outer ring cylinder magnet 4 are arrayed and distributed on the inner peripheral surface of the outer ring cylinder magnet 4 in a way of spacing each other inwardly, so that the permanent magnets 6 of the inner ring cylinder magnet 5 can be inserted into the gap between two adjacent permanent magnets 6 of the outer ring cylinder magnet 4, and the permanent magnets 6 of the outer ring cylinder magnet 4 are also inserted into the gap between two adjacent permanent magnets 6 of the inner ring cylinder magnet 5, so that the inner ring cylinder magnet 5 and the outer ring cylinder magnet 4 are assembled together, and the spacing gap between the permanent magnets 6 of the inner ring cylinder magnet 5 and the adjacent permanent magnets 6 of the outer ring cylinder magnet 4 is the relative rotation gap accommodated by the outer ring cylinder magnet 4 and the inner ring cylinder magnet 5.

[0042] As Figure 10 shown is the magnetic circuit schematic diagram of the magnetic pole combination state of the coupling of the application, which also shows the cooperation of the permanent magnet 6 after the combination of the outer ring cylinder magnet 4 and the inner ring cylinder magnet 5. The N pole and the S pole of each permanent magnet 6 are in the left-right direction, and each adjacent two permanent magnets 6 in the ring-shaped arrangement of the permanent magnets 6 distributed in the annular space between the inner positioning copper ring 5-1 and the outer positioning copper ring 4-1 have the same adjacent face magnetic pole, that is, the N pole corresponds to the N pole and the S pole corresponds to the S pole between the adjacent side faces of each two permanent magnets 6. The magnetic circuit of the ring-shaped arrangement of the permanent magnet 6 is closed in the annular space formed by the inner positioning copper ring 5-1, the outer positioning copper ring 4-1, the two inner ring copper plates 5-2, and the two outer ring copper plates 4-2. Referring to Figure 10 , the inner circumferential surface of the inner positioning copper ring 5-1 is also provided with a clamping groove structure, which is matched with the key groove of the second linkage shaft 2, so that the inner positioning copper ring 5-1 cannot rotate relative to the second linkage shaft 2 after being sleeved on the second linkage shaft 2.

[0043] Figure 7 is a schematic diagram of the second linkage shaft structure of the coupling of the application, Figure 8 is a split view of the second linkage shaft structure of the coupling of the application, in combination with Figure 7 , Figure 8 , the second linkage shaft 2 includes a main shaft body 2-1, the outer circumferential surface of the main shaft body 2-1 is provided with a key groove structure, the key groove structure is used for matching and installing with the clamping groove of the inner circumferential surface of the inner positioning copper ring 5-1, one end of the main shaft body is integrally or sleevedly provided with a first rigid linkage gear 2-2, the first rigid linkage gear 2-2 is made of steel or hard alloy material, which can drive the first linkage shaft 1 to rotate synchronously in cooperation with the first linkage shaft 1, the other end surface of the main shaft body 2-1 is provided with a bolt hole 2-4, the second rigid linkage gear 3 is fixedly installed on the end surface by matching with the bolt hole 2-4 through a fixing bolt 2-6, the combination structure of the outer ring cylinder magnet 4 and the inner ring cylinder magnet 5 is sleeved on the main shaft body 2-1 and is limited in axial displacement by the first rigid linkage gear 2-2 and the second rigid linkage gear 3. The second linkage shaft 2 further includes a second flange 2-3 and a positioning shaft 2-5, the second flange is fixedly connected to one end of the main shaft body 2-1 where the first rigid linkage gear 2-2 is arranged, and the positioning shaft 2-5 extends axially from the end surface of the main shaft body 2-1 where the second rigid linkage gear 3 is installed and is gap-fitted into the central through hole of the first linkage shaft 1 to serve as an auxiliary positioning function.

[0044] Figure 9is a schematic diagram of a first linkage shaft structure of the coupling of the application, the first linkage shaft 1 is composed of an outer shell, a first flange 1-1 and an end cover 1-2, the outer shell is a barrel structure with one end open, the second linkage shaft 2, the outer ring cylinder magnet 4 and the inner ring cylinder magnet 5 are all contained inside the barrel structure, and the open end is fixedly installed with the end cover 1-2, and the first flange 1-1 is fixedly connected to the other end of the outer shell. In order to cooperate with the positioning of the outer ring cylinder magnet 4, the inner circumferential surface of the outer shell is uniformly arrayed with first key grooves 1-3 extending in the axial direction. As shown in Figure 9 , the end cover 1-2 is an internal gear type structure, the inner circumferential surface is uniformly distributed with a plurality of teeth in the circumferential direction, in the assembled state, the end cover 1-2 and the first rigid linkage gear 2-2 form a tooth groove cooperation, and the gap width between the teeth of the end cover 1-2 and the teeth of the first rigid linkage gear 2-2 is smaller than the gap width between the adjacent permanent magnets 6 of the outer ring cylinder magnet 4 and the inner ring cylinder magnet 5, when the coupling is started, the end cover 1-2 and the first rigid linkage gear 2-2 first make hard contact to complete the rigid start of the coupling, so as to avoid the collision between the permanent magnets.

[0045] Referring to Figure 6 , is a schematic diagram of the combined state of the inner and outer ring cylinder magnets of the coupling of the application, the figure also shows a steel ring 7 and a plurality of steel blocks 8, the steel ring 7 is located at the innermost side of the combined structure of the outer ring cylinder magnet 4 and the inner ring cylinder magnet 5, that is, it is located at the side close to the first flange 1-1 in the outer shell of the first linkage shaft 1, a plurality of steel blocks 8 are uniformly inlaid on the inner circumferential surface of the steel ring 7, the outer circumferential surface of the steel ring 7 and the first key grooves 1-3 of the outer shell form a key groove cooperation to lock the relative rotation, the combined structure of the steel ring 7 and the plurality of steel blocks 8 is used to form a tooth groove cooperation with the second rigid linkage gear 3 located inside the outer shell, and the gap width between the teeth of the second rigid linkage gear 3 and the side surface of the adjacent steel block 8 is smaller than the gap width between the adjacent permanent magnets 6 of the outer ring cylinder magnet 4 and the inner ring cylinder magnet 5, which is the same as the gap width between the teeth of the end cover 1-2 and the teeth of the first rigid linkage gear 2-2 and corresponds to the axial position, so that the first rigid linkage gear 2-2 and the second rigid linkage gear 3 respectively act on both ends of the main shaft body 2-1 to realize the rigid start of the coupling.

[0046] The high-speed shaft self-adaptive eccentricity-free coupling of the gas turbine of the application is used for the linkage of the load shaft that can tolerate a certain eccentricity, as shown in Figure 11 , the torque transmitted is much higher than that of the flexible transmission mode of the traditional permanent magnet coupling, and can drive a larger power load 9.

[0047] The above describes the specific embodiments of the present application in combination with the drawings, but is not a limitation on the protection scope of the present application. Those skilled in the art should understand that, on the basis of the technical solutions of the present application, various equivalent structures or equivalent process modifications or deformations, or direct or indirect application to other related technical fields without creative labor of those skilled in the art, are still within the protection scope of the present application.

Claims

1. A self-adaptive eccentric coupling for a high-speed shaft of a gas turbine, comprising a first linkage shaft and a second linkage shaft, wherein the second linkage shaft extends into the outer casing of the first linkage shaft, characterized in that, An outer ring cylinder magnet and an inner ring cylinder magnet are assembled in the gap between the second linkage shaft and the first linkage shaft. The inner ring cylinder magnet is sleeved on the second linkage shaft in a non-rotatable manner, and the outer ring cylinder magnet is embedded inside the first linkage shaft in a non-rotatable manner. The inner ring cylinder magnet and the outer ring cylinder magnet are fitted together with a clearance fit. The inner circumferential surface of the outer ring cylinder magnet has multiple permanent magnets arranged in an inward radial array, and the outer circumferential surface of the inner ring cylinder magnet has multiple permanent magnets arranged in an outward radial array; each permanent magnet of the inner ring cylinder magnet is inserted into the gap between two adjacent permanent magnets of the outer ring cylinder magnet, and each permanent magnet of the outer ring cylinder magnet is also inserted into the gap between two adjacent permanent magnets of the inner ring cylinder magnet; In the same plane perpendicular to the central axis of the coupling, the permanent magnets of the outer ring cylinder magnet and the permanent magnets of the inner ring cylinder magnet are arranged in a ring with intervals between each other. The N pole and S pole of each permanent magnet are in the left and right direction, and the adjacent magnetic poles of each pair of adjacent permanent magnets are the same. The magnetic circuit of a ring of permanent magnets arranged in a ring in each plane is enclosed in the annular space that contains the ring of permanent magnets. The second linkage shaft is fixedly provided with a first rigid linkage gear of external gear type structure, and the first linkage shaft is fixedly provided with an end cover of internal gear type that cooperates with the first rigid linkage gear. The end cover and the first rigid linkage gear form a tooth groove cooperation, and the gap width between the teeth of the end cover and the teeth of the first rigid linkage gear is smaller than the gap width between the adjacent permanent magnets of the outer ring cylinder magnet and the inner ring cylinder magnet.

2. The adaptive eccentric coupling for high-speed gas turbine shafts according to claim 1, further characterized in that, The outer ring cylinder magnet includes multiple outer positioning copper rings and multiple outer ring copper plates stacked together at intervals. The upper and lower surfaces of the outer ring cylinder magnet are each covered by an outer ring copper plate. The inner circumferential surface of the outer positioning copper ring is provided with slots arranged in a circular array. A permanent magnet is embedded in each slot on the inner circumferential surface of the outer positioning copper ring. The inner ring cylinder magnet includes multiple inner positioning copper rings and inner ring copper plates stacked at intervals. The upper and lower surfaces of the inner ring cylinder magnet are each covered by an inner ring copper plate. The outer circumferential surface of the inner positioning copper ring is provided with slots arranged in a circular array. Each slot on the outer circumferential surface of the inner positioning copper ring is inlaid with a permanent magnet, and the number of permanent magnets is the same as the number of permanent magnets on the inner circumferential surface of each outer positioning copper ring in the outer ring cylinder magnet. The inner positioning copper ring, outer positioning copper ring, two inner ring copper plates, and two outer ring copper plates together form the annular space of the magnetic circuit of the permanent magnet arranged in a closed ring.

3. The adaptive eccentric coupling for high-speed shafts of gas turbines according to claim 2, further characterized in that, The outer circumferential surface of the outer positioning copper ring is also provided with a slot, which forms a keyway with the inner circumferential surface of the first linkage shaft to restrict the relative rotation of the two. The inner circumferential surface of the inner positioning copper ring is also provided with a groove, which forms a keyway with the outer circumferential surface of the second linkage shaft to restrict the relative rotation of the two.

4. The adaptive eccentric coupling for high-speed shafts of gas turbines according to any one of claims 1-3, characterized in that, The second linkage shaft includes a main shaft body, the outer peripheral surface of which is configured as a keyway structure, a first rigid linkage gear is fixedly disposed at one end of the main shaft body, and a second rigid linkage gear is fixedly disposed at the other end of the main shaft body; the combined structure of the outer ring cylinder magnet and the inner ring cylinder magnet is fitted onto the main shaft body and axial displacement is locked by the first rigid linkage gear and the second rigid linkage gear.

5. The adaptive eccentric coupling for high-speed gas turbine shafts according to claim 4, further characterized in that, The second linkage shaft also includes a second flange and a positioning shaft. The second flange is fixedly connected to one end of the main shaft body where the first rigid linkage gear is installed. The positioning shaft extends axially from the end face of the main shaft body where the second rigid linkage gear is installed, and the positioning shaft extends into the central through hole of the first linkage shaft with clearance fit.

6. The adaptive eccentric coupling for high-speed gas turbine shafts according to claim 4, further characterized in that, The combined structure of the outer ring cylinder magnet and the inner ring cylinder magnet has a steel ring and multiple steel blocks at one end located inside the first linkage shaft. The steel ring is non-rotatably disposed inside the first linkage shaft, and the multiple steel blocks are evenly embedded in the inner circumferential surface of the steel ring at intervals. The combined structure of the steel ring and multiple steel blocks forms a tooth groove fit with the second rigid linkage gear, and there is a gap width between the teeth of the second rigid linkage gear and the side of the adjacent steel block. This gap width is the same as the gap width between the teeth of the end cap and the teeth of the first rigid linkage gear and corresponds to the axial position.

7. The adaptive eccentric coupling for high-speed shafts of gas turbines according to claim 5 or 6, further characterized in that, The first linkage shaft consists of an outer shell, a first flange, and an end cap. The outer shell is a cylindrical shell structure with one open end. The outer ring magnet and the inner ring magnet are both housed inside the cylindrical shell structure, and the end cap is fixedly installed at the open end. The first flange is fixedly connected to the non-open end of the outer shell.

8. The adaptive eccentric coupling for high-speed gas turbine shafts according to claim 2, further characterized in that, Nine permanent magnets are embedded on the inner circumference of each outer positioning copper ring, and nine permanent magnets are embedded on the outer circumference of each inner positioning copper ring; the number of outer positioning copper rings and inner positioning copper rings is the same and not less than four.

9. The adaptive eccentric coupling for high-speed shafts of gas turbines according to claim 4, further characterized in that, A bolt hole is provided on the other end face of the main shaft, and the second rigid linkage gear is fixedly installed on the end face by means of a fixing bolt engaging with the bolt hole.

10. The gas turbine high-speed shaft adaptive eccentric coupling according to claim 9, characterized in that, The first rigid linkage gear, the second rigid linkage gear, and the end cover are all made of steel or hard alloy.

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