A controllable stiffness rotor support structure

Abstract

The present application relates to a controllable stiffness rotor supporting structure, belonging to the technical field of rotor supporting structure, solves the problem of small carrying capacity, large structure size and weight, poor reliability of the active variable stiffness supporting structure in the prior art. The supporting structure comprises a wave spring element, a wave spring element mounting ring, an amplitude limiting block, a squirrel cage mounting frame and a squirrel cage; a plurality of amplitude limiting blocks are clamped in the grooves of the wave spring element mounting ring; the wave spring element is arranged between two adjacent amplitude limiting blocks; the wave spring element mounting ring and the wave spring element are arranged side by side and are fixedly connected; one end of the squirrel cage is nested in the inside of the squirrel cage mounting frame, and the other end is sleeved on the inside of the annular structure composed of the wave spring element and the amplitude limiting block; the squirrel cage is used for supporting the rotating shaft. The present application realizes effective suppression of rotor system vibration in a wide speed range, and has the advantages of simple stiffness regulation mode, wide stiffness adjustment range, high carrying capacity and compact structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rotor support structure, and particularly relates to a rotor support structure with controllable stiffness. BACKGROUND

[0002] As a kind of high-speed rotating complex thermal power machinery, the vibration problem of rotor system of gas turbine has been the key technical problem in its structural design and development process. From the application situation in recent decades, the traditional passive vibration reduction measures based on elastic support and extrusion oil film damper have been the preferred scheme for vibration reduction design of gas turbine rotor system. Its basic principle is to reduce the critical speed of rotor by introducing elastic support and to increase the support damping by introducing extrusion oil film damper, so as to reduce the resonance response when rotor speed passes through critical speed. However, since the structural parameters of elastic support and extrusion oil film damper cannot be modified once determined, the traditional passive vibration reduction measures are difficult to cope with the increasingly variable operating conditions of new generation gas turbine. In order to overcome the above limitations, vibration control strategies based on active variable stiffness support structure have gradually emerged and been widely studied, which is expected to effectively suppress the vibration of rotor system in the full speed range of gas turbine.

[0003] At present, the existing active variable stiffness support structure mainly includes the following types: first, electromagnetic bearing, which realizes real-time adjustment of equivalent support stiffness of rotor by applying controllable electromagnetic force to the rotor, and the disadvantage is that the volume and weight of the required winding group are large, which is too bulky; second, support structure designed based on intelligent materials such as electro / magnetic rheological fluid and piezoelectric material, which changes the support stiffness by changing the mechanical properties of intelligent materials, but the existing such structures have the disadvantages of poor durability and stability, small carrying capacity, large space occupation and complex control mechanism in application; third, squirrel cage elastic support with adjustable length of cage bar, which changes the effective length of cage bar by designing actuator to change the support stiffness, and its implementation principle is the simplest, but the disadvantage is that the required control and driving mechanism is often too complex.

[0004] Therefore, the present application provides a rotor support structure with controllable stiffness, which realizes effective suppression of rotor system vibration under the premise of miniaturization and large carrying capacity. SUMMARY

[0005] In view of the above analysis, the present application aims to provide a rotor support structure with controllable stiffness to solve the problems of large size, heavy weight and poor carrying capacity of existing rotor support structures.

[0006] The purpose of the present application is mainly realized by the following technical solutions:

[0007] A rotor support structure with controllable stiffness, comprising: the wave spring element, the wave spring element mounting ring, the limiting block, the squirrel cage mounting rack and the squirrel cage.

[0008] The limiting block is clamped in the groove of the inner surface of the wave spring element mounting ring; a plurality of limiting blocks are arranged at equal intervals along the circumferential direction of the wave spring element mounting ring; the wave spring element is arranged on the inner side of the wave spring element mounting ring and clamped between two adjacent limiting blocks;

[0009] The squirrel cage mounting frame is arranged parallel to the wave spring element mounting ring and fixedly connected with the wave spring element mounting ring; one end of the squirrel cage is nested and mounted in the interior of the squirrel cage mounting frame, and the other end is sleeved on the inner side of the annular structure composed of the wave spring element and the limiting block; the squirrel cage can support the rotating shaft;

[0010] The wave spring element is made of shape memory alloy, and the stiffness of the wave spring element can be controlled by controlling the temperature of the wave spring element.

[0011] Further, the wave spring element mounting ring and the squirrel cage mounting frame are fixedly connected through connecting screws.

[0012] Further, the squirrel cage is fixedly connected with the squirrel cage mounting frame through squirrel cage mounting screws.

[0013] Further, the wave spring element mounting ring comprises a mounting disc and a retaining edge; the groove is arranged on the inner surface of the mounting disc and a plurality of grooves are arranged at equal intervals in the circumferential direction; the limiting block is mounted in the groove.

[0014] Further, the retaining edge and the mounting disc are an integral structure for axially limiting the wave spring element and the limiting block.

[0015] Further, a plurality of first mounting holes are arranged at equal intervals in the circumferential direction on the mounting disc, a first screw is mounted in the first mounting hole, and the first screw is used to mount the wave spring element mounting ring on the casing.

[0016] Further, a second mounting hole is further arranged on the mounting disc, a second screw is mounted in the second mounting hole, and the second screw is used to fixedly connect the wave spring element mounting ring with the squirrel cage mounting frame.

[0017] Further, the groove is a blind groove.

[0018] Further, the retaining edge is located at the bottom of the groove, and the inner diameter of the retaining edge is smaller than the inner diameter of the mounting disc.

[0019] Further, the squirrel cage comprises a squirrel cage mounting disc, a cage bar and a support sleeve; the squirrel cage mounting disc is integrally connected with the support sleeve through a plurality of cage bars; the cage bar is used to provide elastic support stiffness.

[0020] Further, the outer annular surface of the supporting sleeve is in radial contact with the wave spring element, and the inner annular surface of the supporting sleeve is connected with the rotating shaft through a bearing, and the supporting sleeve can transmit radial load to the wave spring element.

[0021] Further, the squirrel cage mounting frame comprises a first mounting ring, a second mounting ring, a side plate and a cylindrical wall; the side plate and the second mounting ring are fixedly arranged at two ends of the cylindrical wall respectively and are perpendicular to the axis of the cylindrical wall; the first mounting ring is arranged at the edge of the side plate and is fixedly connected with the wave spring element mounting ring; and the second mounting ring is fixedly connected with the squirrel cage mounting disc of the squirrel cage.

[0022] The technical scheme of the present application can achieve at least one of the following effects:

[0023] 1. The controllable stiffness rotor supporting structure provided by the present application can provide supporting stiffness in parallel connection by the squirrel cage and the wave spring element, thereby ensuring that the supporting structure has high carrying capacity and that the radial stiffness of the supporting structure has good uniformity along the axial direction of the rotating shaft.

[0024] 2. The controllable stiffness rotor supporting structure provided by the present application has small space occupation, light weight and strong designability, and is very suitable for the vibration reduction design of a medium or small-sized aero gas turbine engine whose supporting space is limited.

[0025] 3. The controllable stiffness rotor supporting structure provided by the present application has strong carrying capacity, compact structure, simple stiffness regulation mode and wide stiffness regulation range, and can effectively cope with the variable working state of a new generation of gas turbine, especially an aero gas turbine engine, and realize rotor vibration control in a wide rotating speed range.

[0026] In the present application, the above technical schemes can be combined with each other to realize more preferred combination schemes. Other features and advantages of the present application will be described in the subsequent specification, and some advantages will become apparent from the specification or be understood by implementing the present application. The purposes and other advantages of the present application can be realized and obtained from the contents particularly pointed out in the specification and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings are included to provide a further understanding of the application and are incorporated herein and constitute a part of the detailed description. The drawings illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application.

[0028] Figure 1 is a three-quarter sectional view of a controllable stiffness rotor supporting structure of the present application;

[0029] Figure 2 is an assembly schematic view of a controllable stiffness rotor supporting structure of the present application in a casing.

[0030] Figure 3 is a three-dimensional structure schematic diagram of the wave spring element of the present application;

[0031] Figure 4 is a circumferential cross-section schematic diagram of the wave spring element of the present application;

[0032] Figure 5 is a three-dimensional structure schematic diagram of the wave spring element mounting ring of the present application;

[0033] Figure 6 is a three-dimensional structure schematic diagram of the limiting block of the present application;

[0034] Figure 7 is a three-dimensional structure schematic diagram of the squirrel cage mounting frame of the present application;

[0035] Figure 8 is a three-dimensional structure schematic diagram of the squirrel cage of the present application.

[0036] Reference signs:

[0037] 1 - wave spring element; 2 - wave spring element mounting ring; 3 - limiting block; 4 - squirrel cage mounting frame; 5 - squirrel cage; 6 - axial sealing ring; 7 - radial sealing ring; 8 - connecting screw; 9 - squirrel cage mounting screw; 10 - casing; 11 - rotating shaft; 12 - bearing; 13 - support mounting screw; 101 - first arc-shaped groove; 102 - second arc-shaped groove; 21 - mounting disc; 211 - first mounting hole; 22 - groove; 23 - baffle; 24 - second mounting hole; 31 - ventilation hole; 41 - first mounting ring; 42 - second mounting ring; 43 - side plate; 431 - air inlet hole; 432 - air outlet hole; 44 - cylindrical wall; 51 - squirrel cage mounting disc; 511 - squirrel cage mounting hole; 52 - cage bar; 53 - support sleeve; 54 - radial clamping groove; 55 - axial clamping groove. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present application will be described in detail below with reference to the drawings, which form a part of this application, and together with the embodiments of the present application serve to explain the principles of the present application, and do not limit the scope of the present application.

[0039] Example 1

[0040] One specific embodiment of the present application discloses a controllable stiffness rotor support structure, such as Figure 1 , Figure 2As shown in the figure, it comprises: the wave spring element 1, the wave spring element mounting ring 2, the limiting block 3, the squirrel cage mounting frame 4 and the squirrel cage 5; the limiting block 3 is clamped in the groove 22 of the inner surface of the wave spring element mounting ring 2; the limiting block 3 is arranged at equal intervals along the circumferential direction of the wave spring element mounting ring 2; the wave spring element 1 is arranged on the inner side of the wave spring element mounting ring 2 and clamped between two adjacent limiting blocks 3; the squirrel cage mounting frame 4 is arranged parallel to the wave spring element mounting ring 2 and the two are fixedly connected; one end of the squirrel cage 5 is nested and mounted in the interior of the squirrel cage mounting frame 4 and the other end is sleeved on the inner side of the annular structure composed of the wave spring element 1 and the limiting block 3; the squirrel cage 5 can support the rotating shaft 11; the wave spring element 1 is made of shape memory alloy and its stiffness can be controlled by controlling the temperature of the wave spring element 1.

[0041] In the present application, the wave spring element 1 is made of shape memory alloy, which is in martensite phase at low temperature, has a small elastic modulus and can provide low support stiffness; and is in austenite phase at high temperature, has a large elastic modulus and can provide high support stiffness. By adjusting the temperature of the wave spring element 1, the metallographic state thereof can be changed, thereby adjusting the support stiffness thereof and adjusting the overall macroscopic support stiffness of the support structure.

[0042] In one specific embodiment of the present application, as shown in Figure 3 , Figure 4 the wave spring element 1 is in the form of an arc-shaped block; a plurality of arc-shaped grooves are formed on the two axial side surfaces of the wave spring element 1, which are used to weaken the radial stiffness of the wave spring element and make it an elastic element.

[0043] Specifically, a plurality of first arc-shaped grooves 101 are formed on one side axial side surface of the wave spring element 1 and a plurality of second arc-shaped grooves 102 are formed on the other side axial side surface of the wave spring element 1; and the first arc-shaped grooves 101 and the second arc-shaped grooves 102 are arranged in radial offset. Figure 3 , Figure 4 As shown in the figure, the cross section of the wave spring element 1 is in the form of a single-layer or multi-layer Z-shaped structure, and the more the layers, the smaller the corresponding radial support stiffness. In the present application, the wave spring element 1 is the core part for realizing the controllable stiffness function, which is generally in the form of an arc-shaped block, and a plurality of arc-shaped grooves are formed on the two axial side surfaces at intervals, forming a single-layer or multi-layer Z-shaped annular structure to provide elastic support stiffness. The wave spring element 1 is made of shape memory alloy, and since the shape memory alloy has different elastic moduli at high and low temperatures, the temperature of the wave spring element 1 can be adjusted to adjust the radial support stiffness thereof.

[0044] Further, as shown in Figure 2As shown, the wave spring element mounting ring 2 is fixedly connected to the cage mounting frame 4 via connecting screws 8. The cage 5 is fixedly connected to the cage mounting frame 4 via cage mounting screws 9.

[0045] like Figure 5 As shown, the wave spring element mounting ring 2 comprises a mounting plate 21 and a rib 23. Multiple grooves 22 are provided on the inner surface of the mounting plate 21, and are evenly distributed circumferentially. The ribs 23 are integral with the mounting plate 21 and serve to axially limit the wave spring element 1 and the limiter block 3. Furthermore, the mounting plate 21 has multiple first mounting holes 211 evenly distributed circumferentially. These first mounting holes 211 are used to receive first screws for mounting the wave spring element mounting ring 2 to the casing 10. The mounting plate 21 also has second mounting holes 24, which receive second screws for securing the wave spring element mounting ring 2 to the cage mounting bracket 4. The second mounting holes 24 are formed on a boss formed between two adjacent grooves 22 and are used to attach the cage mounting bracket 4.

[0046] like Figure 6 As shown, the limit block 3 is a wedge-shaped structure; the upper end of the limit block 3 can cooperate with the groove 22 on the wave spring element mounting ring 2, and the lower end of the limit block 3 can fit with the side of the wave spring element 1.

[0047] In the present invention, multiple limiting blocks 3 are installed in multiple grooves 22 on the wave spring element mounting ring 2, forming a mounting frame for the wave spring element 1. The wave spring element 1 can then be inserted into the gap between two adjacent limiting blocks 3. The multiple limiting blocks 3 and the multiple wave spring elements 1 are arranged crosswise and can be assembled into a ring structure. The mounting plate 21 can limit the radial displacement of the wave spring element 1, and the limiting blocks 3 can limit the circumferential displacement of the wave spring element 1. The mounting plate 21 and the limiting blocks 3 can respectively provide radial and circumferential constraints on the wave spring element 1. Figure 1 At the same time, the amplitude limiting block 3 is used to limit the radial amplitude of the rotating shaft 11 to avoid excessive vibration causing rotor-static friction failure.

[0048] Specifically, if Figure 5As shown in the figure, the groove 22 is a blind groove, the retaining edge 23 is located at the bottom of the groove 22, and the inner diameter of the retaining edge 23 is smaller than the inner diameter of the mounting disc 21. That is, the groove 22 of the wave spring element mounting ring 2 is not axially through, but has a certain axial depth for mounting the limiting block 3. The diameter of the retaining edge 23 is smaller than the inner diameter of the mounting disc 21, that is, the retaining edge 23 protrudes from the boss formed by the two adjacent grooves 22, and the retaining edge 23 plays a role in axially positioning the wave spring element 1 and the limiting block 3 mounted on the wave spring element mounting ring 2, and can limit the axial displacement of the limiting block 3 and the wave spring element 1.

[0049] As shown in the figure, Figure 7 As shown in the figure, the squirrel cage mounting frame 4 includes a first mounting ring 41, a second mounting ring 42, a side plate 43 and a cylindrical wall 44; the side plate 43 and the second mounting ring 42 are fixedly arranged at both ends of the cylindrical wall 44 respectively, and are perpendicular to the axis of the cylindrical wall 44; the first mounting ring 41 is arranged at the edge of the side plate 43, and the first mounting ring 41 is fixedly connected with the wave spring element mounting ring 2; the second mounting ring 42 is fixedly connected with the squirrel cage 5.

[0050] In the present application, the squirrel cage mounting frame 4 has the following three functions: first, it is used to connect the wave spring element mounting ring 2 and the squirrel cage 5 to form an integral support structure; second, it axially constrains the wave spring element 1 and the limiting block 3; third, the squirrel cage mounting frame 4, together with the wave spring element mounting ring 2, the squirrel cage 5 and the casing 10, forms an annular heat exchange gas cavity, and by passing a gas at a certain temperature into the heat exchange gas cavity, the wave spring element 1 can be heated or cooled.

[0051] As shown in the figure, Figure 8 As shown in the figure, the squirrel cage 5 is a cylindrical structure; the squirrel cage 5 includes a squirrel cage mounting disc 51, a cage bar 52 and a support sleeve 53; the squirrel cage mounting disc 51 is connected with the support sleeve 53 as a whole through a plurality of cage bars 52; the cage bar 52 is used to provide elastic support stiffness. The outer ring surface of the support sleeve 53 is in radial contact with the wave spring element 1, the inner ring surface of the support sleeve 53 is connected with the rotating shaft 11 through the bearing 12, and the support sleeve 53 can transmit radial load to the wave spring element 1.

[0052] Specifically, the cage mounting plate 51 is circumferentially defined with a plurality of cage mounting holes 511. The cage mounting screws 9 pass through these holes 511 to secure the cage 5 to the cage mounting frame 4. Multiple cage bars 52 are arranged along the circumference of the support sleeve 53, with one end of each bar connected to the support sleeve 53 and the other end connected to the cage mounting plate 51. The bars 52 provide elastic support stiffness. The outer annular surface of the support sleeve 53 contacts the inner side of the annular structure formed by the wave spring elements 1 and the limiter block 3. The inner annular surface contacts the outer ring surface of the bearing 12, which, in turn, engages the outer surface of the shaft 11. This allows the support sleeve 53 to transmit radial loads from the support point to the wave spring elements 1. In other words, when the shaft 11 experiences radial vibration, the radial load is transmitted to the wave spring elements 1 through the bearing 12 and support sleeve 53, thereby damping the vibrations of the shaft 11.

[0053] In the present invention's controllable-stiffness rotor support structure, a wave spring element mounting ring 2 is mounted on a casing 10 via support mounting screws 13. The cage bars 52 of the cage 5 and the annular support formed by multiple wave spring elements 1 are connected in parallel. The cage 5's support sleeve 53 supports the rotating shaft 11 via a bearing 12. The wave spring elements 1, wave spring element mounting ring 2, limiter blocks 3, and connecting screws 8 form an annular variable-stiffness structure for providing controllable support stiffness. The cage mounting frame 4, cage 5, and cage mounting screws 9 form a basic elastic support structure for providing constant support stiffness. By providing support stiffness to the rotating shaft 11 through the parallel connection of the annular variable-stiffness structure and the basic elastic support structure, the present invention not only ensures a high load-bearing capacity of the support structure but also ensures uniform radial stiffness along the axial direction of the rotating shaft 11.

[0054] In one embodiment of the present invention, in order to achieve stiffness control of the wave spring element 1 made of a shape memory alloy, this embodiment adopts a method of introducing airflows of different temperatures into the air cavity within the support structure to achieve temperature control of the wave spring element 1, thereby achieving stiffness control of the wave spring element 1 and ultimately achieving stiffness control of the entire support structure.

[0055] Specifically, if Figure 2 As shown, when the casing 10, wave spring mounting ring 2, cage mounting frame 4, and cage 5 are fixedly connected, a heat exchange cavity is formed that surrounds the annular structure formed by the limiter block 3 and wave spring 1. Specifically, the support sleeve 53 of the cage 5, the side plate 43 of the cage mounting frame 4, the wave spring mounting ring 2, and the casing 10 together form an annular heat exchange cavity for admitting air to heat or cool the wave spring 1.

[0056] Furthermore, if Figure 8As shown, the outer side surface of the supporting sleeve 53 is provided with a radial clamping groove 54, and the front end surface is provided with an axial clamping groove 55; the axial sealing ring 6 is installed in the radial clamping groove 54, and the radial sealing ring 7 is installed in the axial clamping groove 55. Specifically, the outer ring surface of the axial sealing ring 6 is tightly attached to the inner surface of the squirrel cage mounting frame 4, which can close the gap between the supporting sleeve 53 and the squirrel cage mounting frame 4. The outer side surface of the radial sealing ring 7 is tightly attached to the side surface of the casing 10, which can close the gap between the supporting sleeve 53 and the casing 10; in the present application, the axial sealing ring 6 and the radial sealing ring 7 together form a sealing structure, which can close the heat exchange gas cavity and provide a closed gas passage for the annular variable stiffness structure composed of the limiting block 3 and the wave spring element 1, thereby achieving axial sealing and radial sealing of the annular heat exchange gas cavity; further, the heat exchange gas cavity is connected to different temperature gases, which can control the temperature of the wave spring element 1, and finally realize the regulation of the supporting stiffness.

[0057] Preferably, the axial sealing ring 6 and the radial sealing ring 7 are made of soft rubber that can withstand high temperature, which can ensure good sealing effect for high temperature and low temperature heat exchange gas flow, and at the same time, it does not introduce too much additional radial stiffness and additional axial stiffness.

[0058] Further, the limiting block 3 is provided with a through ventilation hole 31 on the left and right side surfaces; and the ventilation hole 31 can communicate with the annular groove on the wave spring element 1. That is, the ventilation hole 31 can communicate two groups of annular grooves on the adjacent two wave spring elements 1.

[0059] In the present application, the limiting block 3 is provided with a ventilation hole 31 along the circumference, and the ventilation hole 31 and the annular groove of the wave spring element 1 can form an annular gas flow passage; further, when the heat exchange gas cavity is connected to the gas, the gas can flow through the plurality of limiting blocks 3 and wave spring elements 1 in turn, which is convenient for heating or cooling the plurality of wave spring elements 1 by using the gas flow.

[0060] Further, in order to realize the temperature control of the wave spring element 1, it is necessary to connect the heat exchange gas cavity to the gas with a pre-control temperature. In the present application, the side plate 43 of the squirrel cage mounting frame 4 is provided with an air inlet hole 431 and an air outlet hole 432 for the introduction or discharge of the heat exchange gas flow. Preferably, the air inlet hole 431 and the air outlet hole 432 are arranged at an interval of 180° along the circumferential direction of the squirrel cage mounting frame 4. That is, the air inlet hole 431 and the air outlet hole 432 are symmetrically arranged on the side plate 43, as shown in Figure 7

[0061] The application provides a vibration damping application scenario of a controllable stiffness rotor supporting structure as follows:

[0062] 1) Vibration control during starting and stopping of the gas turbine: ​

[0063] When the gas turbine is started, high-temperature gas is introduced into the annular heat exchange cavity to heat the wave spring element 1, so that it is in a high support stiffness state, and at this time, the corresponding critical speed of the rotor is also higher. Then the rotor is raised to the critical speed corresponding to high temperature, and then low-temperature gas is introduced into the annular heat exchange cavity to cool the wave spring element 1, so that it is in a low support stiffness state. At this time, the corresponding critical speed of the rotor will be reduced to below the current speed, and there will be no resonance peak value in the subsequent process of raising the speed to the working speed, thereby achieving the effect of vibration reduction.

[0064] When the gas turbine is stopped, the wave spring element 1 is first cooled, so that the rotor is lowered to the vicinity of the critical speed under low support stiffness; then the wave spring element 1 is heated, so that the rotor continues to be lowered to stop under high support stiffness. In this process, the resonance peak value generated by lowering the speed at a constant support stiffness can also be avoided, thereby achieving the effect of vibration reduction.

[0065] 2) Vibration control during variable working condition process: When the gas turbine needs to switch from the working speed to the critical speed near the target speed under the current support stiffness, the wave spring element 1 can be heated or cooled to change its support stiffness, so that the new critical speed of the rotor is far away from the target speed, thereby ensuring that the vibration of the rotor is in a small magnitude.

[0066] Compared with the prior art, the technical scheme provided by the embodiment has at least one of the following beneficial effects:

[0067] 1. The controllable stiffness rotor support structure provided by the application can adjust the radial stiffness of the support structure by adjusting the temperature of the wave spring element made of shape memory alloy, and the stiffness adjustment method is simple. In addition, since the elastic modulus of shape memory alloy at high temperature is about 2-3 times that at low temperature, the support structure has a wide stiffness adjustment range.

[0068] 2. In the controllable stiffness rotor support structure of the application, the squirrel cage 5 and the wave spring element 1 are connected in parallel to play a supporting role, the squirrel cage 5 is used to provide a constant elastic stiffness to improve the stiffness uniformity of the support structure, and the wave spring element 1 is used to provide an adjustable elastic stiffness. The stiffness ratio provided by the squirrel cage 5 and the wave spring element 1 can be adjusted to achieve the required design of the support stiffness adjustment range.

[0069] The above is only a preferred specific embodiment of the application, but the protection scope of the application is not limited thereto, and any changes or replacements within the technical range disclosed by the application can be easily thought of by those skilled in the art, which should be covered within the protection scope of the application.

Claims

1. A rotor support structure with controllable stiffness, characterized in that: include: A wave spring element (1), a wave spring element mounting ring (2), a limit block (3), a squirrel cage mounting frame (4) and a squirrel cage (5); The amplitude limiting block (3) is clamped in a groove (22) on the inner surface of the wave spring element mounting ring (2); a plurality of the amplitude limiting blocks (3) are arranged at equal intervals along the circumferential direction of the wave spring element mounting ring (2); the wave spring element (1) is arranged on the inner side of the wave spring element mounting ring (2) and is clamped between two adjacent amplitude limiting blocks (3); The squirrel cage mounting frame (4) and the wave spring element mounting ring (2) are arranged in parallel and fixedly connected; one end of the squirrel cage (5) is nested and mounted inside the squirrel cage mounting frame (4), and the other end is sleeved on the inner side of the annular structure composed of the wave spring element (1) and the limit block (3); the squirrel cage (5) is capable of supporting the rotating shaft (11); The wave spring element (1) is made of shape memory alloy, and its stiffness can be regulated by controlling the temperature of the wave spring element (1).

2. The rotor support structure with controllable stiffness according to claim 1, characterized in that: The wave spring element mounting ring (2) and the squirrel cage mounting frame (4) are fixedly connected via connecting screws (8).

3. The rotor support structure with controllable stiffness according to claim 1, characterized in that: The squirrel cage (5) is fixedly connected to the squirrel cage mounting frame (4) via squirrel cage mounting screws (9).

4. The rotor support structure with controllable stiffness according to any one of claims 1 to 3, characterized in that: The wave spring element mounting ring (2) comprises: a mounting plate (21) and a retaining edge (23); the grooves (22) are arranged on the inner surface of the mounting plate (21), and a plurality of grooves are evenly distributed in the circumferential direction; and the amplitude limiting block (3) is installed in the grooves (22).

5. The rotor support structure with controllable stiffness according to claim 4, characterized in that: The retaining edge (23) and the mounting plate (21) are an integral structure and are used to axially limit the wave spring element (1) and the amplitude limiting block (3).

6. The rotor support structure with controllable stiffness according to claim 5, characterized in that: A plurality of first mounting holes (211) are uniformly distributed circumferentially on the mounting plate (21).

7. The rotor support structure with controllable stiffness according to claim 6, characterized in that: A first screw is installed in the first mounting hole (211), and the first screw is used to mount the wave spring element mounting ring (2) on the casing (10).

8. The rotor support structure with controllable stiffness according to claim 7, characterized in that: A second mounting hole (24) is also provided on the mounting plate (21), and a second screw is installed in the second mounting hole (24). The second screw is used to fix the wave spring element mounting ring (2) to the squirrel cage mounting frame (4).

9. The rotor support structure with controllable stiffness according to claim 8, characterized in that: The groove (22) is a blind groove.

10. The rotor support structure with controllable stiffness according to claim 8 or 9, characterized in that: The retaining edge (23) is located at the bottom of the groove (22), and the inner diameter of the retaining edge (23) is smaller than the inner diameter of the mounting plate (21).

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