An electrorheological elastomer squirrel cage spring-supported rotor support device

Abstract

The present invention discloses an electrorheological elastomer (ERE) squirrel cage spring support rotor support device, comprising an ERE outer support, an ERE elastic ring assembly, a squirrel cage spring support, and a bearing. The ERE elastic ring assembly comprises an insulating shell, an outer pole body, an inner pole body, and an ERE ring. The rotor is supported on the inner ring surface of the squirrel cage spring support through the bearing. The outer ring surface of the squirrel cage spring support is connected to the inner ring surface of the ERE elastic ring assembly. The outer ring surface of the ERE elastic ring assembly is installed on the inner ring surface of the ERE outer support. The squirrel cage spring support is installed on the ERE force transmission shell. The ERE elastic ring assembly serves as a basic unit body with controllable rotor support stiffness and damping, and has a stiffness parallel relationship with the squirrel cage spring support. The outer pole body and the inner pole body are respectively installed on the inner and outer diameter sides of the insulating shell. The ERE ring is located between the outer pole body and the inner pole body. The outer pole body and the inner pole body are respectively connected to the positive and negative poles of a power supply. The voltage between the outer pole body and the inner pole body is controlled to change the support stiffness and damping of the support device, thereby realizing a wide range of adjustment of the rotor critical speed and suppression of the vibration amplitude.

Description

Technical Field

[0001] The invention relates to the technical field of vibration control of rotating power machinery, in particular to an electrorheological elastomer squirrel cage spring-supported rotor supporting device. Background Art

[0002] The rotor vibration level of rotating power machinery is closely related to the rotor support stiffness and damping value. The vibration amplitude of the rotor system increases dramatically when it exceeds the critical speed, which can easily lead to rotor-stator friction, bearing seat loosening, reduced bearing life, and even rotor fracture. Therefore, a certain speed margin is required between the rotor's operating speed and the critical speed. Furthermore, increasing damping at the rotor support to dissipate vibration energy can also reduce rotor vibration.

[0003] Squirrel cage spring supports (hereinafter referred to as spring supports) combined with squeeze film dampers (SFDs) are commonly used in rotating power machinery to reduce rotor vibration. The spring support structure is used to mount the rotor's support bearings. Its stiffness is parallel to the bearing stiffness. Leveraging its low cage bar stiffness, the SFD is used to adjust the rotor system's critical speed, thereby increasing the speed margin between the rotor's operating speed and the critical speed. The SFD is placed on the outer ring of the spring support, forming a ring of oil film around it. When rotor vibration is transmitted to the spring support through the bearing, the spring support deforms and squeezes the oil film. The oil film force provides additional damping to slow deformation of the spring support, thereby reducing rotor vibration.

[0004] Traditional squirrel-cage spring-loaded damping (SFD) devices are passive vibration damping devices. Parameters such as the length, width, and thickness of the spring-loaded bars, as well as the SFD's oil film clearance, oil film radius, and oil film pressure, are often designed based on the rotor system's target critical speed and vibration amplitude. Once the SFD's design parameters are determined, the spring stiffness and damping provided by the spring cannot be manipulated. Controllable SFDs, however, suffer from system complexity, slow response, and strong nonlinearity. As the operating conditions and structures of rotating power machinery become increasingly complex, the demand for active control of rotor vibration is growing stronger. This requires dampers to be able to actively adjust the damping value by actively varying the damping coefficient, and even to be able to actively vary the stiffness to adjust the critical speed. Furthermore, the rotor support areas of rotating power equipment generally have limited space and weight requirements. Magnetorheological fluids, magnetorheological elastomers, electrorheological fluids, and electrorheological elastomers (EREs) are smart materials that utilize specialized fluids and elastomers whose viscosity and stiffness vary with magnetic or electric field strength. These materials are considered viable solutions for active vibration reduction. However, magnetorheological materials require the design of large and complex coils to provide the magnetic field, which requires a lot of weight and space. Electrorheological fluid materials also have the disadvantages of requiring sealing and particle sedimentation, which leads to a decline in vibration reduction performance. Summary of the Invention

[0005] The object of the present invention is to provide an electrorheological elastomer squirrel cage spring-supported rotor support device to solve the above-mentioned problems.

[0006] The technical solution of the present invention is:

[0007] An electrorheological elastomer squirrel cage elastic support rotor support device, comprising: an ERE outer support, the ERE support is processed with a flange mounting edge with a bolt hole at the other axial end, an axial limiting boss of an insulating shell is processed radially inwardly on the same end as the flange mounting edge on the ERE support, the limiting boss and the outer end face limiting ring and the inner end face limiting ring jointly realize the axial limiting of the ERE elastic ring assembly on one end, the ERE outer support has an inner ring surface; the squirrel cage elastic support, the middle part of which is a cage bar, has an inner ring mounting surface and an outer ring mounting surface, the rotor is supported on the inner ring mounting surface of the squirrel cage elastic support through a bearing, and the outer ring surface of the squirrel cage elastic support located at the same end as the bearing mounting position is processed with a thread for installing the ERE elastic support assembly; the ERE elastic support assembly comprises: an insulating shell, the insulating shell is made of non-conductive hard material, such as plastic, nylon and ceramic, the inner ring surface of the outer wall of the insulating shell is processed with an internal thread, the internal thread is adapted to the thread of the outer ring surface of the squirrel cage elastic support, The outer ring surface of the outer wall of the edge shell is processed with an external thread, which is adapted to the thread of the inner ring surface of the ERE support. The insulating shell is fixed to the ERE support through the thread of the outer ring surface of the outer wall. It is an annular structure with a U-shaped cross-section along the axial opening. The outer ring surface of the insulating shell is connected to the inner ring surface of the ERE outer support, and the inner ring surface of the insulating shell is connected to the outer ring surface of one end of the squirrel cage spring support bearing installation position; the outer pole body is installed on the outer diameter side of the inner wall of the axial opening of the insulating shell; the inner pole body is installed on the inner diameter side of the inner wall of the axial opening of the insulating shell; the ERE ring is located between the outer pole body and the inner pole body, and the outer pole body and the inner pole body press the ERE ring, and the outer pole body and the inner pole body are respectively connected to the positive and negative poles of the power supply. By controlling the voltage between the outer pole body and the inner pole body, the support stiffness and damping of the support device are changed; the outer end face limiting ring is installed on the outer diameter side ring surface of the axial opening position of the insulating shell; the inner end face limiting ring is installed on the inner diameter side ring surface of the axial opening position of the insulating shell.

[0008] Furthermore, the ERE external support includes: an ERE force transmission shell and a load-bearing support. The ERE force transmission shell is a structure with flange mounting edges at both axial ends, one end of which is connected to the flange of the ERE support, and the other end has both an inner flange mounting edge and an outer flange mounting edge. The inner flange mounting edge is connected to the flange mounting edge of the squirrel cage elastic support, and the outer flange mounting edge is installed on the load-bearing support by bolts. The flange mounting edge at one axial end of the ERE force transmission shell is connected to the end face flange mounting edge of the ERE external support by bolts, and the outer flange mounting edge at the other axial end of the ERE force transmission shell is installed on the load-bearing support, and the end face flange mounting edge of the non-bearing mounting end of the squirrel cage elastic support is connected to the inner flange mounting edge of the ERE force transmission shell.

[0009] Furthermore, one end face of the outer ring of the bearing is positioned by the inner ring limiting boss of the squirrel cage spring support, and the other end face is tightened by a bearing locking nut. One end face of the bearing locking nut is a planar structure and contacts the end face of the outer ring of the bearing. The other end face of the bearing locking nut is processed with end face teeth for disassembly.

[0010] Furthermore, the installation axis of the ERE outer support, ERE elastic ring assembly, squirrel cage elastic support, bearing locking nut, bearing, ERE force transmission shell and load-bearing support is the same as the rotor axis.

[0011] Furthermore, the squirrel cage spring includes but is not limited to a single-stage squirrel cage spring, a multi-stage squirrel cage spring and a reentry squirrel cage spring.

[0012] Furthermore, the ERE ring is integrated with the squirrel cage spring support, achieving parallel stiffness, allowing for active adjustment of the rotor support stiffness and damping. When the rotor support stiffness changes, the critical speed of the rotor also changes. This critical speed can be adjusted away from the operating speed by controlling the electric field voltage. Simultaneously, the rotor support damping also changes under the action of the electric field, enabling real-time damping adjustment, dissipating rotor vibration energy and reducing rotor vibration.

[0013] Furthermore, the stiffness of the ERE ring is K ERE , the damping of the ERE ring is C ERE , the stiffness of the squirrel cage support is K0, and the damping of the squirrel cage support is negligible, then the stiffness K and damping C of the ERE ring and the squirrel cage support in parallel satisfy

[0014] K=K ERE +K0,C=C ERE .

[0015] Furthermore, the insulating shell, the outer polar body, the inner polar body and the ERE ring are all annular structures.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention fully utilizes the characteristics of electrorheological elastomer (ERE) intelligent materials, whose stiffness and loss factor vary with voltage over a wide range, to achieve controlled wide-range variation of the cage spring stiffness and damping, thereby achieving wide-range adjustment of the rotor critical speed and suppression of the vibration amplitude. The changes to the cage spring structure and the overall support structure are minimal. In addition, by utilizing the solid-state elastic material properties of the ERE material, the electrode structure design is simple, and no sealing is required to prevent leakage. The modular design of the ERE elastic components has the advantages of simple and compact structure, flexible design, and easy replacement.

[0018] 2. The ERE elastic ring assembly in this invention is the basic unit for controlling rotor support stiffness and damping. The ERE elastic ring assembly and the squirrel cage elastic support are in a parallel stiffness relationship. The outer and inner pole bodies are mounted on the inner and outer diameters of the insulating shell, respectively, with the ERE ring positioned between them. These pole bodies are connected to the positive and negative poles of a power source, respectively. By controlling the voltage between the outer and inner pole bodies, the support stiffness and damping of the support device can be varied. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front cross-sectional view of the structural schematic diagram of the present invention,

[0020] Figure 2 yes Figure 1 Left side view of the structure,

[0021] Figure 3 yes Figure 1 Right side view of the structure,

[0022] Figure 4 It is a front view of the structural diagram of the present invention,

[0023] Figure 5 yes Figure 1 An enlarged view of the structural schematic diagram of the middle C area.

[0024] Among them, 1. ERE outer support, 2. Insulation shell, 3. Outer pole body, 4. ERE ring, 5. Inner pole body, 6. Outer end face limit ring, 7. Inner end face limit ring, 8. Squirrel cage spring support, 9. Bearing locking nut, 10. Bearing, 11. ERE force transmission shell, 12. Load-bearing support. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1 To the attached Figure 5 , a detailed description of the specific embodiments of the present invention is provided. In the description of the present invention, it should be understood that the terms "center," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limiting the present invention.

[0026] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features; and in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0027] Example

[0028] Electrorheological elastomer material is a solid elastic material, and only electrodes need to be designed according to needs, without considering leakage issues. Therefore, the vibration reduction structure design is more flexible and simple, and the performance is more stable.

[0029] The distribution state of the dielectric particles in the electrorheological elastomer becomes orderly distributed under the action of the electric field. The stiffness coefficient and material loss factor of the elastomer material change with the voltage, and its stiffness level can reach 10 7 N / m, and the stiffness variation range is as much as 3 orders of magnitude, which provides a technical approach to achieve a large range of controllable changes in the stiffness and damping of squirrel cage spring supports.

[0030] Based on the above, an electrorheological elastomer squirrel cage elastic support rotor support device in this embodiment includes: an ERE outer support 1, the ERE support 1 is processed with a flange mounting edge with a bolt hole at the other axial end, and an axial limiting boss of the insulating shell 2 is processed radially inward at the same end as the flange mounting edge on the ERE support 1. The limiting boss, the outer end face limiting ring 6, and the inner end face limiting ring 7 jointly realize the axial limiting of the ERE elastic ring assembly. One end face has an inner ring surface; a squirrel cage elastic support 8, the middle part of the squirrel cage elastic support 8 is a cage bar with The inner ring mounting surface and the outer ring mounting surface, the rotor is supported on the inner ring mounting surface of the squirrel cage spring support 8 through the bearing 10, and the outer ring surface of the squirrel cage spring support 8 at the same end as the bearing 10 is processed with a thread for installing the ERE spring support assembly; the ERE spring support assembly includes: an insulating shell 2, an outer pole body 3, an outer pole body 5, an ERE ring 4, an outer end face limit ring 6 and an inner end face limit ring 7. The insulating shell 2 is made of non-conductive hard materials, such as plastic, nylon and ceramics, and the inner ring surface of the outer wall of the insulating shell 2 is processed with an internal thread. The internal thread The groove is adapted to the thread of the outer ring surface of the squirrel cage elastic support 8, the outer ring surface of the outer wall of the insulating shell 2 is processed with an external thread, and the external thread is adapted to the thread of the inner ring surface of the ERE support 1. The insulating shell 2 is fixed to the ERE support 1 through the thread of the outer ring surface of the outer wall. It is an annular structure with a U-shaped cross-section along the axial opening. The outer ring surface of the insulating shell 2 is connected to the inner ring surface of the ERE outer support 1, and the inner ring surface of the insulating shell 2 is connected to the outer ring surface of one end of the squirrel cage elastic support 8 where the bearing is installed; the outer pole body 3 is installed on the outer diameter side of the inner wall of the axial opening of the insulating shell 2; The inner pole body 5 is installed on the inner diameter side of the inner wall of the axial opening of the insulating shell 2; the ERE ring 4 is located between the outer pole body 3 and the inner pole body 5, and the outer pole body 3 and the inner pole body 5 press the ERE ring 4. The outer pole body 3 and the inner pole body 5 are respectively connected to the positive and negative poles of the power supply. By controlling the voltage between the outer pole body 3 and the inner pole body 5, the support stiffness and damping of the support device are changed; the outer end face limit ring 6 is installed on the outer diameter side ring surface of the axial opening position of the insulating shell 2; the inner end face limit ring 7 is installed on the inner diameter side ring surface of the axial opening position of the insulating shell 2.

[0031] like Figure 1 As shown, the ERE outer support 1 includes: an ERE force transmission shell 11 and a load-bearing support 12. The ERE force transmission shell 11 is a structure with flange mounting edges at both axial ends. One end is connected to the flange of the ERE support 1, and the other end has both an inner flange mounting edge and an outer flange mounting edge. The inner flange mounting edge is connected to the flange mounting edge of the squirrel cage elastic support 8, and the outer flange mounting edge is installed on the load-bearing support 12 by bolts. The flange mounting edge at one axial end of the ERE force transmission shell 11 is connected to the end face flange mounting edge of the ERE outer support 1 by bolts, and the outer flange mounting edge at the other axial end of the ERE force transmission shell 11 is installed on the load-bearing support 12, and the end face flange mounting edge of the non-bearing mounting end of the squirrel cage elastic support 8 is connected to the inner flange mounting edge of the ERE force transmission shell 11.

[0032] like Figure 1 As shown, one end face of the outer ring of the bearing 10 is positioned by the inner ring limiting boss of the squirrel cage spring support 8, and the other end face is tightened by the bearing locking nut 9. One end face of the bearing locking nut 9 is a flat structure and contacts the end face of the outer ring of the bearing 10. The other end face of the bearing locking nut 9 is processed with end face teeth for disassembly.

[0033] like Figure 1-3 As shown, the insulating shell 2, the outer pole body 3, the inner pole body 5 and the ERE ring 4 are all annular structures, and the installation axis of the ERE outer support 1, the ERE elastic ring assembly, the squirrel cage elastic support 8, the bearing locking nut 9, the bearing 10, the ERE force transmission shell 11 and the load-bearing support 12 is the same as the rotor axis.

[0034] It is worth noting that the squirrel cage spring support 8 includes but is not limited to a single-stage squirrel cage spring support, a multi-stage squirrel cage spring support and a return squirrel cage spring support.

[0035] In some embodiments, the ERE ring 4 is integrated with the squirrel cage spring support 8. This allows for better parallel damping and stiffness, allowing for active adjustment of rotor support stiffness and damping. When the rotor support stiffness changes, the rotor's critical speed also changes. By controlling the electric field voltage, the rotor's critical speed is adjusted away from the operating speed. Simultaneously, the electric field also alters the rotor support damping, enabling real-time damping adjustment, dissipating rotor vibration energy and reducing rotor vibration.

[0036] The stiffness of the ERE ring 4 assembly is K ERE , the damping of ERE ring 4 is C ERE , the stiffness of the cage spring support 8 is K0, and the damping of the cage spring support 8 is negligible. Then the stiffness K and damping C of the ERE ring 4 and the cage spring support 8 in parallel satisfy

[0037] K=K ERE +K0,C=C ERE .

[0038] Working principle of an electrorheological elastomer squirrel cage rotor support device:

[0039] An electrorheological elastomer (ERE) squirrel cage spring-loaded rotor support device includes an ERE outer support, an ERE elastic ring assembly, a squirrel cage spring, a bearing locking nut, a bearing, an ERE force transmission housing, and a load-bearing support. The ERE elastic ring assembly includes an insulating housing, an outer pole body, an inner pole body, an ERE ring, an outer end face limit ring, and an inner end face limit ring. The rotor is supported on the inner ring surface of the squirrel cage spring-loaded support via a bearing. The outer ring surface of the squirrel cage spring-loaded support is connected to the inner ring surface of the ERE elastic ring assembly via threads. The outer ring surface of the ERE elastic ring assembly is threadedly mounted on the inner ring surface of the ERE outer support. The ERE outer support is axially connected to the ERE force transmission housing via circumferential bolts. The ERE force transmission housing is mounted on the load-bearing support, and the flange mounting edge of the squirrel cage spring-loaded support is mounted on the flange mounting edge of the ERE force transmission housing. The ERE elastic ring assembly is a basic unit body with controllable rotor support stiffness and damping, and its stiffness is in parallel with that of the squirrel cage spring-loaded support. The outer pole body and the inner pole body are respectively installed on the inner and outer diameter sides of the insulating shell, and the ERE ring is located between the outer pole body and the inner pole body. The outer pole body and the inner pole body are respectively connected to the positive and negative poles of the power supply. By controlling the voltage between the outer pole body and the inner pole body, the support stiffness and damping of the support device can be changed.

[0040] The above disclosures are only some preferred specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present invention.

Claims

1. An electrorheological elastomer squirrel cage spring-supported rotor support device, characterized in that: include: An ERE outer support (1) has an inner ring surface on one end surface; a squirrel cage elastic support (8) has an inner ring mounting surface and an outer ring mounting surface; a rotor is supported on the inner ring mounting surface of the squirrel cage elastic support (8) through a bearing (10); an ERE elastic support assembly is mounted on the outer ring surface of the squirrel cage elastic support (8) at the same end as the bearing (10) mounting position; the ERE elastic support assembly comprises: The insulating shell (2) is annular and has an opening on its annular end face along the axial direction. The outer annular surface of the insulating shell (2) is connected to the inner annular surface of the ERE outer support (1). The inner annular surface of the insulating shell (2) is connected to the outer annular surface of one end of the squirrel cage elastic support (8) where the bearing is installed. The polar body comprises an outer polar body (3) and an inner polar body (5), wherein the outer polar body (3) is mounted on the outer diameter side of the inner wall of the opening of the insulating shell (2); and the inner polar body (5) is mounted on the inner diameter side of the inner wall of the opening of the insulating shell (2); The ERE ring (4) is located between the outer pole body (3) and the inner pole body (5), and the outer pole body (3) and the inner pole body (5) are respectively connected to the positive and negative poles of the power supply. By controlling the voltage between the outer pole body (3) and the inner pole body (5), the support stiffness and damping of the support device are changed; An outer end surface limiting ring (6) is installed on an outer diameter side ring surface of the axial opening position of the insulating shell (2); An inner end surface limiting ring (7) is installed on an inner diameter side ring surface at an axial opening position of the insulating shell (2).

2. The electrorheological elastomer squirrel cage rotor support device according to claim 1, characterized in that: The ERE outer support (1) comprises: an ERE force transmission shell (11) and a load-bearing support (12); a flange mounting edge at one axial end of the ERE force transmission shell (11) is connected to an end face flange mounting edge of the ERE outer support (1) by bolts; an outer flange mounting edge at the other axial end of the ERE force transmission shell (11) is mounted on the load-bearing support (12); and an end face flange mounting edge of a non-bearing mounting end of the squirrel cage spring support (8) is connected to an inner flange mounting edge of the ERE force transmission shell (11).

3. The electrorheological elastomer squirrel cage rotor support device according to claim 2, characterized in that: One end face of the outer ring of the bearing (10) is positioned by the inner ring limiting boss of the squirrel cage spring support (8), and the other end face is pressed by a bearing locking nut (9). One end face of the bearing locking nut (9) is a flat structure and contacts the end face of the outer ring of the bearing (10). The other end face of the bearing locking nut (9) is processed with end face teeth for disassembly.

4. The electrorheological elastomer squirrel cage rotor support device according to claim 3, characterized in that: The installation axis of the ERE outer support (1), the ERE elastic ring assembly, the squirrel cage elastic support (8), the bearing locking nut (9), the bearing (10), the ERE force transmission shell (11) and the load-bearing support (12) is the same as the rotor axis.

5. The electrorheological elastomer squirrel cage rotor support device according to claim 1, characterized in that: The squirrel cage spring support (8) includes but is not limited to a single-stage squirrel cage spring support, a multi-stage squirrel cage spring support and a return-type squirrel cage spring support.

6. The electrorheological elastomer squirrel cage rotor support device according to claim 1, characterized in that: The ERE ring (4) and the squirrel cage spring support (8) are designed as an integral unit.

7. The electrorheological elastomer squirrel cage rotor support device according to claim 6, characterized in that: The stiffness of the ERE ring (4) is K ERE , the damping of ERE ring (4) is C ERE , the stiffness of the cage spring support (8) is K0, and the damping of the cage spring support (8) is negligible, then the stiffness K and damping C of the ERE ring (4) and the cage spring support (8) in parallel satisfy K=K ERE +K0,C=C ERE 。 8. The electrorheological elastomer squirrel cage rotor support device according to claim 1, characterized in that: The exopolar body (3), the endopole body (5) and the ERE ring (4) are all ring structures.

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