An adjustable damping semi-active eddy current damper

Abstract

The application provides an adjustable damping semi-active eddy current damper, and belongs to the field of vibration control.The device comprises a rack, a gear set, a copper block, a permanent magnet, a hydraulic controller, a hydraulic rod and an acceleration sensor.The linear displacement of an object is converted into the rotation of the copper block through the mechanical structure of the gear and the rack, and the rotation cuts the magnetic force lines of the permanent magnet to generate an eddy current magnetic field, which generates a damping force that hinders the relative movement of the permanent magnet and the copper block with the original magnetic field, and the acceleration sensor and the hydraulic controller change the distance between the permanent magnet and the conductor to realize the adjustment of the damping force.The application has the characteristics of being able to adapt to different installation environments, improving the energy consumption efficiency of the damper and being adjustable and controllable in damping force.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of vibration control, and particularly relates to a semi-active adjustable damping eddy current damper. BACKGROUND

[0002] Engineering vibration control technology is widely used in the fields of building structures, mechanical equipment, vehicle suspension systems and structural seismic resistance and shock absorption, and the core of the vibration control technology is to effectively reduce or eliminate the vibration of structures and equipment under the action of external disturbance, so as to improve the service life, reliability and safety thereof. Common vibration control methods include passive control, semi-active control and active control, among which the passive control technology is widely used due to its simple structure, no need for external energy and convenient maintenance, and the most common method of passive control is to set a damper, and common dampers include viscous dampers and friction dampers, but the damping force is fixed. The common method of semi-active control is to add a magneto-rheological damper or an eddy current damper, the magneto-rheological damper can adjust the damping force in real time through an electromagnetic field and has a fast response, but the working fluid may leak, and the magneto-rheological fluid may deposit and age, and the traditional eddy current damper adopts an axial relative motion mode for energy dissipation, and the damping is changed by adjusting the current, but the axial speed is not enough, and the internal heat dissipation space is small, resulting in low energy dissipation efficiency. The common method of active control is active mass damper, robust control and adaptive control, and the structure is controlled by external energy, although the control effect is optimal, but the cost is high and the energy consumption is large.

[0003] In view of the above problems, the applicant has invented a semi-active eddy current damper with adjustable damping, which converts and amplifies the linear displacement of a connected object into the rotating speed of a copper block through a gear and rack mechanical structure, rotates to cut the magnetic force lines of a permanent magnet to generate an eddy current magnetic field, converts kinetic energy into heat energy through the eddy current, generates damping force between the original magnetic field, and cooperates with an acceleration sensor and a hydraulic controller to change the distance between the permanent magnet and the conductor to adjust the damping force. SUMMARY

[0004] To solve the related technical problems, the present application cooperates with a gear device and a hydraulic control method, converts the linear displacement of an object into the rotation of a copper block through a gear and rack mechanical structure, rotates to cut the magnetic force lines of a permanent magnet to generate an eddy current magnetic field, generates damping force between the original magnetic field, and cooperates with an acceleration sensor and a hydraulic controller to change the distance between the permanent magnet and the conductor to adjust the damping force.

[0005] The basic idea of the technical solution adopted by the present application is:

[0006] The damping device shell is provided with a cylindrical outer wall outside the damping device shell, and the inside of the shell is divided into a gear cavity and a control cavity by a middle partition plate, a gear box is arranged inside the gear cavity, a bearing fixing hole and a rack anti-collision layer are arranged on the upper part of the gear cavity, a reset spring is arranged in the middle of the rack anti-collision layer, and the other end of the reset spring is connected with the rack.

[0007] A rack is arranged on the upper part of the gear box, a guide rod is connected with the rack outside, the guide rod connects the rack and a closing cover, a connecting ring is arranged on the closing cover, a rack limiter is arranged at the tail of the rack, a small transmission gear is engaged with the rack, the small transmission gear is arranged on a transmission shaft, the transmission shaft is rotatably supported through a ball bearing, a large transmission gear is arranged on the transmission shaft at the same time, the large transmission gear is engaged with a driving gear, the driving gear is arranged on a driving shaft, the driving shaft is rotatably supported through a ball bearing, one end of the driving shaft penetrates through the middle partition plate and extends into the control cavity, an acceleration sensor is arranged on the upper part of the rack, and the driving shaft and a copper block in the control cavity are fixed.

[0008] A support is fixed on the damping device shell in the control cavity, a hydraulic rod is arranged on the support, a permanent magnet is fixed on the hydraulic rod, and a hydraulic controller is arranged on one side of the control cavity.

[0009] The hydraulic controller is connected with the hydraulic rod, the hydraulic controller can receive the signal of the acceleration sensor on the upper part of the rack, and the extension length of the hydraulic rod is operated by the hydraulic controller.

[0010] The permanent magnet is fixed on the hydraulic rod and controlled by the hydraulic controller to control the distance between the permanent magnet and the copper block.

[0011] Further, the damping device is connected with the outside through the connecting ring, the damping device shell is provided with a damping device external connecting rod on any surface except the rack extension part, and the damping device external connecting rod can be used as a vibration control fixed end.

[0012] Further, one side of the transmission shaft and the driving shaft is installed in the middle partition plate by a ball bearing.

[0013] Further, the number of teeth of the large transmission gear is greater than that of the small transmission gear.

[0014] Further, the rack limiter is arranged at the tail of the rack, and a rack anti-collision layer is arranged at the same height of the damping device shell and the rack, so that the limiter at the tail of the rack prevents the rack from being separated from the gear cavity due to excessive pulling.

[0015] Further, the reset spring is installed in the rack anti-collision layer, the reset spring provides a rack movement recovery force while hindering movement, and the damping force generated by the eddy current will always hinder the movement of the rack.

[0016] Further, the damping device shell should be a closed box body.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] The present application is suitable for different installation environments by arranging the external connecting rod on any surface of the damper shell except the rack extension part.

[0019] The present application converts the linear displacement of the external connecting object into the rotation of the copper block through the mechanical cooperation of the rack and pinion set, effectively amplifies the rotation speed of the copper block through the radius difference meshing transmission of the transmission gear and the drive gear, and improves the energy consumption efficiency of the eddy current damper.

[0020] The present application effectively changes the damping force of the eddy current damper to the outside by changing the effective magnetic flux by changing the distance between the permanent magnet and the copper block through the cooperation of the acceleration sensor, the hydraulic controller and the hydraulic rod, realizes the adjustable and controllable damping force, and effectively solves the problem of narrow controllable vibration frequency band of the traditional damper. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a three-dimensional structure schematic diagram of the adjustable damping eddy current damper of the present application

[0022] Figure 2 is a top view of the adjustable damping eddy current damper of the present application.

[0023] Figure 3 is a right view of the adjustable damping eddy current damper of the present application.

[0024] Figure 4 is a gear set detail view of the adjustable damping eddy current damper of the present application.

[0025] REFERENCE NUMERALS IN DRAWINGS:

[0026] 10-closed cover; 11-damper shell; 12-cylindrical outer wall; 13-gear box; 14-bearing fixing hole; 15-connection ring; 16-rack anti-collision layer; 17-intermediate partition plate; 18-acceleration sensor; 19-return spring; 2-gear cavity; 20-guiding rod; 21-rack; 22-small transmission gear; 23-large transmission gear; 24-drive gear; 25-roller bearing; 26-transmission shaft; 27-drive shaft; 28-copper block; 29-rack limiter; 3-control cavity; 30-support; 31-hydraulic rod; 32-permanent magnet; 33-hydraulic controller; DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments will be described more clearly and completely below with reference to the drawings of the present application. The specific embodiments described herein are only intended to explain the present application, and are not limited to the present application.

[0028] It should be noted that the drawings and the written description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept to those skilled in the art by referring to specific embodiments. Embodiments

[0029] With reference to Figures 1-4 The damper housing 11 is externally provided with a cylindrical outer wall 12, and the inside of the housing is divided into a gear cavity 2 and a control cavity 3 by an intermediate partition plate 17. The gear cavity 2 is internally provided with a gear box 13. The upper part of the gear cavity 2 is provided with a bearing fixing hole 14 and a rack anti-collision layer 16. The intermediate part of the rack anti-collision layer is provided with a return spring 19, and the other section of the return spring 19 is connected to a rack 21.

[0030] Preferably, the return spring 19 is installed in the rack anti-collision layer 16. The return spring provides a rack movement restoring force while hindering the movement, and the damping force generated by the eddy current hinders the movement of the rack.

[0031] The upper part of the gear box 13 is provided with the rack 21. The rack 21 is externally connected with a guide rod 20. The guide rod 20 connects the rack 21 and a closing cover 10. The closing cover 10 is provided with a connecting ring 15. The tail part of the rack 21 is provided with a rack limiter 29. A small transmission gear 22 is arranged on a transmission shaft 26. The transmission shaft 26 is rotatably supported by a ball bearing 25. The transmission shaft 26 is simultaneously provided with a large transmission gear 23. The large transmission gear 23 engages a driving gear 24. The driving gear 24 is arranged on a driving shaft 27. The driving shaft 27 is rotatably supported by the ball bearing 25. One end of the driving shaft 27 penetrates through the intermediate partition plate 17 and extends into the control cavity 3. The upper part of the rack 21 is provided with an acceleration sensor 18. The driving shaft 27 in the control cavity 3 is fixed with a copper block 28.

[0032] Further, the intermediate partition plate 17 not only separates the gear cavity 2 and the control cavity 3, but also provides support for the ball bearing. The gear box 13 is arranged at the lower part of the gear set to prevent the fixed position from being deviated due to long-term work of the gear set or the rack 21.

[0033] The damper housing 11 in the control cavity 3 is fixed with a support 30. The support 30 is provided with a hydraulic rod 31. The hydraulic rod 31 is fixed with a permanent magnet 32. The bottom of the control cavity 3 is provided with a hydraulic controller 33.

[0034] In the embodiment, the small transmission gear 22 and the large transmission gear 23 are connected with the transmission shaft 26, the drive gear 24 is connected with the drive shaft 27, the transmission shaft 26 and the drive shaft 27 rotate with the two-end fixed ball bearing 25, the small transmission gear 22 is engaged with the rack 21, the large transmission gear 23 is engaged with the drive gear 24, the small transmission gear 22 and the transmission shaft 26 are driven to rotate by the rack 21, the large transmission gear 23 is driven to rotate, the drive gear 24 is engaged with the large transmission gear 23, thereby driving the drive shaft 27 to rotate, and the copper block 28 is rotated.

[0035] In the embodiment, the radius of the index circle of the large transmission gear 23 should be more than twice the radius of the index circle of the small transmission gear 22, the large transmission gear 23 rotates concentrically with the small transmission gear 22, and the rotation speed of the copper block 28 is converted by the rack and pinion set.

[0036] In the embodiment, the rotation speed of the copper block 28 is enlarged by the rack and pinion set, and the copper block 28 rotates under the magnetic field of the permanent magnet 32, the copper block 28 generates the eddy current effect and generates a new magnetic field which is equivalent to the original magnetic field direction, thereby forming a damping force between the original magnetic field and the copper block 28 to hinder the relative movement between the permanent magnet 32 and the copper block 28, and the damping force is transmitted by the gear set, thereby hindering the movement of the rack, the return spring 19 provides the movement resistance when the rack 21 moves and provides the restoring force for the rack 21 when the return spring 19 returns, and the damping force generated by the eddy current effect always hinders the movement of the rack, thereby effectively inhibiting the vibration.

[0037] In the embodiment, the acceleration sensor 18 is arranged above the rack 21 to monitor the acceleration signal of the rack 21, the hydraulic controller 33 can receive the acceleration signal monitored by the acceleration sensor 18 and make a judgment, when the acceleration signal value is less than the set minimum value, the hydraulic controller 33 exits the working state, the position of the hydraulic rod 31 returns to the top of the support 30 to keep the position of the permanent magnet 32 and the copper block 28 maximum and the damping force minimum. When the acceleration sensor 18 monitors that the acceleration signal of the rack 21 increases to the preset range, the hydraulic sensor 33 receives the signal and enters the working state to reduce the distance between the permanent magnet 32 and the copper block 28, the rotation speed of the copper block 28 increases at the same time, the distance decreases, and the damping force increases. Through the cooperation of the acceleration sensor and the hydraulic controller 33, the distance between the permanent magnet 32 and the copper block 28 is controlled to realize the damping force of the adjusting device.

[0038] In the embodiment, the damping housing 11 is entirely closed, and in addition to the hydraulic controller 33, the support 30, the hydraulic rod 31, the permanent magnet 32, and the copper block 28 in the control cavity 3, a space is reserved for the copper block 28 to provide energy dissipation space for the heat energy conversion under the eddy current effect.

[0039] The working principle of the adjustable damping eddy current damper provided by the embodiment is as follows:

[0040] The linear displacement of the connecting object is converted and enlarged into the rotating speed of the copper block 28 through the mechanical structure such as the gear set and the rack 21, and the rotating cutting permanent magnet 32 magnetic induction line generates an eddy current magnetic field, kinetic energy is converted into heat energy dissipation through the eddy current, and under the action of the new magnetic field, the damping force that hinders the relative movement between the permanent magnet 32 and the copper block 28 is formed between the original magnetic field and the copper block 28, so as to hinder the movement of the rack and gear together with the reset spring, and the distance between the permanent magnet and the conductor is changed to realize the adjustable and controllable damping force together with the acceleration sensor and the hydraulic controller.

[0041] The above embodiments of the application are not a limitation on the protection scope of the application, and the embodiments of the application are not limited to this. According to the above content of the application, according to the ordinary technical knowledge and common means in the art, other various forms of modifications, replacements or changes of the above structure of the application, which are made without departing from the above basic technical idea of the application, should fall within the protection scope of the application.

Claims

1. An adjustable-damping semi-active eddy current damper, characterized by, The utility model relates to a damping device, including: Damping device shell (11), the damping device shell (11) outside is provided with cylindrical outer wall (12), the damping device shell (11) around is provided with damping device external connecting rod (34), as vibration control fixed end, the damping device shell (11) inside is divided into gear chamber (2) and control chamber (3) by intermediate partition (17), gear chamber (2) inside is provided with gear box (13), gear chamber upper part is provided with bearing fixed hole (14), rack anticollision layer (16), rack anticollision layer (16) middle part is provided with return spring (19), return spring (19) other end is connected with rack (21); Gear box (13) upper part is provided with rack (21), and rack (21) is externally connected with guide rod (20), and guide rod (20) is connected with rack (21) and closure cover (10), and closure cover (10) is provided with connecting ring (15), and damping device is connected with outside through connecting ring (15), and rack (21) tail part is provided with rack limiter (29), and rack anticollision layer (16) is arranged at the same height of damping device shell (11) and rack (21), and rack (21) is engaged with small transmission gear (22), and small transmission gear (22) is arranged on transmission shaft (26), and transmission shaft (26) is rotatably supported by ball bearing (25), and transmission shaft (26) is simultaneously provided with big transmission gear (23), and big transmission gear (23) is engaged with driving gear (24), and driving gear (24) is arranged on driving shaft (27), and driving shaft (27) is rotatably supported by ball bearing (25), and one end of driving shaft (27) penetrates through intermediate partition (17) and goes into control chamber (3), and rack (21) upper part is provided with acceleration sensor (18), and driving shaft (27) in control chamber (3) is fixed with copper block (28); Control chamber (3) is fixed with support (30), and support (30) is provided with hydraulic rod (31), and hydraulic rod (31) is fixed with permanent magnet (32), and one side of control chamber (3) is provided with hydraulic controller (33); Hydraulic controller (33) is connected with hydraulic rod (31), and hydraulic controller (33) receives acceleration sensor (18) signal on rack (21) upper part, and the extension length of hydraulic rod (31) is operated by hydraulic controller (33); Permanent magnet (32) is fixed with hydraulic rod (31), and the distance between permanent magnet (32) and copper block (28) is controlled by hydraulic controller (33); Hydraulic controller (33) receives acceleration signal monitored by acceleration sensor (18) and judges, when acceleration signal value is less than the minimum value set, hydraulic controller (33) exits working state, and hydraulic rod (31) position returns to support (30) top and keeps permanent magnet (32) and copper block (28) position maximum, and damping force minimum, when acceleration sensor (18) monitors that rack (21) acceleration signal increases to the preset range, hydraulic controller (33) enters working state and reduces the distance between permanent magnet (32) and copper block (28), and copper block (28) rotation speed increases, and the distance reduces, and damping force increases.

2. The semi-active eddy current damper with adjustable damping according to claim 1, characterized in that The transmission shaft (26) and one side of the drive shaft (27) are installed in the middle partition plate (17) by ball bearings (25).

3. The semi-active eddy current damper with adjustable damping according to claim 1, characterized in that The large transmission gear (23) has more teeth than the small transmission gear (22).

4. The semi-active eddy current damper with adjustable damping according to claim 1, characterized in that The damper housing (11) is a closed box.

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