A cable-stayed squirrel cage with variable stiffness and damping

Abstract

The present invention discloses a cable-stayed variable stiffness variable damping squirrel cage, comprising: a squirrel cage; a plurality of carbon fiber cables evenly distributed at circumferential intervals, one end of the carbon fiber cables being installed on the inner surface of a squirrel cage web plate; a variable damping tension component connected to the other end of the carbon fiber cables, the variable damping tension component quickly providing a variable damping tension for the plurality of carbon fiber cables evenly distributed at circumferential intervals. Since the variable damping tension component quickly provides a variable damping tension for the plurality of carbon fiber cables evenly distributed at circumferential intervals, the damping tension is used to pull the squirrel cage web plate to reduce the elastic deformation of the squirrel cage, thereby improving the stiffness of the squirrel cage, so that the support force obtained by the squirrel cage in rapid response is in an adjustable range of variation, solving the problem of slow response speed of the squirrel cage made of memory alloy material to change stiffness, and solving the problem that the squirrel cage stiffness change cannot be adjusted within a range when the support ring supports the squirrel cage.

Description

Technical Field

[0001] The invention relates to a cable-stayed variable stiffness variable damping squirrel cage, belonging to the technical field of aeroengines. Background Art

[0002] The squirrel cage support of aircraft engines is a common rotor elastic vibration damping support structure. The outer ring of the bearing that supports the rotation of the rotor is installed on the inside of the squirrel cage. There is an oil film on the outside of the squirrel cage. The elastic stiffness deformation of the squirrel cage and the oil film on the outside of the squirrel cage form a damping force to consume the rotor vibration energy, thereby suppressing the vibration of the rotor. However, the elastic force of the squirrel cage and the damping force of the oil film are affected by the structural parameters of the squirrel cage itself. During the engine test, the squirrel cage will vibrate violently, which can be solved by changing the squirrel cage stiffness.

[0003] In the Chinese patent publication number CN103244276B, a squirrel cage support with variable rigidity is proposed. Although a memory alloy material is used to make a squirrel cage with variable rigidity, it takes a certain amount of time to heat or cool the memory alloy, and there is a problem that the response speed of the squirrel cage to change rigidity is slowed down.

[0004] In the elastic bearing support of the aircraft engine with Chinese patent publication number CN213419234U, the disclosed technology is: changing the movement of the support ring to provide circumferential support to the outside of the squirrel cage. Although the stiffness of the squirrel cage can be quickly changed, solving the problem of slow response speed of the squirrel cage stiffness change, the supporting force of the support ring on the squirrel cage is unchanged, and there is a problem that the change of the squirrel cage stiffness cannot be adjusted within a range. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a cable-stayed variable stiffness variable damping squirrel cage.

[0006] The present invention is achieved through the following technical solutions.

[0007] The present invention provides a cable-stayed variable stiffness variable damping squirrel cage, comprising:

[0008] Rat cage;

[0009] A plurality of carbon fiber cables are evenly distributed at circumferential intervals, and one end of the carbon fiber cable is installed on the inner surface of the squirrel cage plate;

[0010] The variable damping tension component connected to the other end of the carbon fiber cable quickly provides a variable damping tension for a plurality of carbon fiber cables evenly distributed in the circumferential direction.

[0011] The variable damping tension component is installed on the axial end of the squirrel cage.

[0012] The inner surface of the squirrel cage web is provided with an articulated seat, a cable pin is rotatably provided on the articulated seat, a through hole is provided on the cable pin for the carbon fiber cable to pass through, and a cable end limit sleeve is fixedly provided on the end of the carbon fiber cable passing through the cable pin.

[0013] The variable damping tension component comprises: a magnetorheological fluid housing, the magnetorheological fluid housing is fixedly connected to the axial end of the squirrel cage, and a stepped through hole is provided inside the magnetorheological fluid housing;

[0014] The magnetorheological fluid damping shaft is a stepped magnetorheological fluid damping shaft, which can be slidably installed inside the stepped through hole of the magnetorheological fluid housing. The middle shaft end surface of the magnetorheological fluid damping shaft and the inner end of the magnetorheological fluid housing are spaced apart and can slide relative to each other. The magnetorheological fluid housing and the magnetorheological fluid damping shaft are filled with magnetorheological fluid.

[0015] A magnetorheological fluid damper control coil is installed outside the magnetorheological fluid housing, and the other end of the carbon fiber cable is fixedly connected to the magnetorheological fluid damping shaft of the variable damping tension component.

[0016] The magnetorheological fluid damping shaft is provided with an annular groove for mounting a magnetorheological fluid damping shaft guide ring.

[0017] The magnetorheological fluid housing is provided with two threaded through holes which are correspondingly screwed and tightly mounted with a liquid injection screw and a liquid outlet screw.

[0018] The variable damping tension component also includes: a magnetorheological fluid damper end cover, which is fixedly connected to the magnetorheological fluid housing and is made of non-magnetic material; a through hole is provided inside the magnetorheological fluid damper end cover, and the magnetorheological fluid damper shaft is sealed and matched with the inner surface of the through hole of the magnetorheological fluid damper end cover through a magnetorheological fluid damping dynamic sealing ring.

[0019] The variable damping tension assembly also includes: a super magnetostrictive shell, a magnetorheological fluid damper end cover and the super magnetostrictive shell are fixedly connected to the magnetorheological fluid shell via a magnetorheological fluid damper end cover fixing bolt; a threaded step through hole is provided inside the super magnetostrictive shell, and a rare earth super magnetostrictive shaft is installed inside the super magnetostrictive shell;

[0020] A connecting spring, with two ends of the connecting spring correspondingly installed on the rare earth giant magnetostrictive shaft and the magnetorheological fluid damping shaft;

[0021] The magnetorheological fluid housing, the magnetorheological fluid damper end cover and the super magnetostrictive housing are hollow and connected, and the magnetorheological fluid is filled around the connecting spring;

[0022] The giant magnetostrictive control coil is installed outside the giant magnetostrictive shell.

[0023] The variable damping tension component also includes: a preload adjusting bolt, which is threadedly screwed with the threaded step through hole in the giant magnetostrictive housing.

[0024] The beneficial effects of the present invention are as follows: since the variable damping tension component is a plurality of carbon fiber cables uniformly distributed at circumferential intervals, which quickly provide a damping tension in a variable range, the damping tension is used to pull the squirrel cage web to reduce the elastic deformation of the squirrel cage, thereby improving the stiffness of the squirrel cage, so that the support force obtained by the squirrel cage in rapid response is in an adjustable range of variation, solving the problem of a slow response speed of a squirrel cage made of a memory alloy to change stiffness, and solving the problem that the squirrel cage stiffness change cannot be adjusted within a range when the support ring supports the squirrel cage. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a front cross-sectional schematic diagram of the present invention;

[0026] Figure 2 yes Figure 1 Sectional view along line AA;

[0027] Figure 3 It is a schematic diagram of the main structure of the present invention;

[0028] Figure 4 It is a schematic diagram of the connection between the cable end stop sleeve, the carbon fiber cable and the squirrel cage of the present invention;

[0029] Figure 5 It is a schematic diagram of the force analysis of the squirrel cage and the carbon fiber cable of the present invention;

[0030] In the figure: 1-squirrel cage; 2-cable pin; 3-carbon fiber cable; 4-magnetorheological fluid housing; 5-liquid injection screw; 6-magnetorheological fluid damping shaft; 7-liquid outlet screw; 8-magnetorheological fluid damper end cover; 9-super magnetostrictive housing; 10-super magnetostrictive control coil; 11-preload adjustment bolt; 12-rare earth super magnetostrictive shaft; 13-connecting spring; 14-magnetorheological fluid damping dynamic sealing ring; 15-magnetorheological fluid damper end cover fixing bolt; 16-magnetorheological fluid damper control coil; 17-magnetorheological fluid damping shaft guide ring; 18-magnetorheological fluid housing fixing bolt; 19-cable end limit sleeve. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0032] like Figures 1 to 5 shown.

[0033] The present application discloses a cable-stayed variable stiffness variable damping squirrel cage, comprising:

[0034] A squirrel cage 1 is used for mounting bearings to rotatably support the rotor.

[0035] A carbon fiber cable 3 is installed at one end with the inner surface of a squirrel cage plate. The carbon fiber cables 3 are multiple and evenly distributed at circumferential intervals. The carbon fiber cables 3 are made of carbon fiber material. The carbon fiber cables 3 are installed with the inner surface of a squirrel cage plate as follows: a hinge seat is installed on the inner surface of the squirrel cage plate, and a cable pin 2 is rotatably installed on the hinge seat. The cable pin 2 is provided with a through hole for the carbon fiber cable 3 to pass through. The end of the carbon fiber cable 3 passing through the cable pin 2 is fixed with a cable end limit sleeve 19 to prevent the carbon fiber cable 3 from escaping from the through hole on the cable pin 2.

[0036] The variable damping tension component connected to the other end of the carbon fiber cable 3 quickly provides a variable damping tension to a plurality of carbon fiber cables 3 evenly distributed in the circumferential direction.

[0037] Since the variable damping tension component is a plurality of carbon fiber cables 3 evenly distributed at circumferential intervals, the damping tension is used to pull the cage 1 plate to reduce the elastic deformation of the cage 1, and the damping tension dissipates the energy in the vibration of the cage 1, thereby improving the damping of the cage 1, thereby improving the stiffness of the cage 1. Figure 5 :

[0038] When the cage is deformed by force F, there is a force F 拉 Prevent the squirrel cage from deforming, so that its stiffness can be equivalently expressed as K = αk′, where k′ is the original stiffness, so that the support force obtained by the quick response of the squirrel cage 1 is in an adjustable range of variation, which solves the problem of slow response speed of the memory alloy squirrel cage to change stiffness and solves the problem that the support ring cannot adjust the squirrel cage stiffness change within the range.

[0039] The variable damping tension component is installed on the axial end of the squirrel cage 1 .

[0040] The variable damping tension assembly comprises: a magnetorheological fluid housing 4, the magnetorheological fluid housing 4 is made of a magnetic conductive material, the magnetorheological fluid housing 4 is fixedly connected to the axial end of the squirrel cage 1 via a magnetorheological fluid housing fixing bolt 18, and a stepped through hole is provided inside the magnetorheological fluid housing 4;

[0041] The magnetorheological fluid damping shaft 6 is a stepped magnetorheological fluid damping shaft 6 which can be slidably mounted inside the stepped through hole of the magnetorheological fluid housing 4. The middle shaft end surface of the magnetorheological fluid damping shaft 6 and the inner end of the magnetorheological fluid housing 4 are spaced apart and can slide relative to each other. The magnetorheological fluid housing 4 and the magnetorheological fluid damping shaft 6 are filled with magnetorheological fluid (MR).

[0042] The magnetorheological fluid damper control coil 16 is installed outside the magnetorheological fluid housing 4, and the other end of the carbon fiber cable 3 is fixedly connected to the magnetorheological fluid damping shaft 6 of the variable damping tension component.

[0043] By controlling the magnetic field strength generated by energizing the magnetorheological fluid damper control coil 16, the viscosity and fluidity of the magnetorheological fluid are controlled, so that the variable damping tension component can quickly provide a variable range of damping tension for multiple carbon fiber cables 3 evenly distributed circumferentially.

[0044] The magnetorheological fluid damping shaft 6 is provided with an annular groove for mounting a magnetorheological fluid damping shaft guide ring 17 , and the magnetorheological fluid damping shaft guide ring 17 provides guidance and sealing for the sliding displacement between the magnetorheological fluid damping shaft 6 and the magnetorheological fluid housing 4 .

[0045] The magnetorheological fluid housing 4 is provided with two threaded through holes and correspondingly screwed and tightly mounted with a liquid injection screw 5 and a liquid outlet screw 7 , so as to facilitate replacement and replenishment of the magnetorheological fluid in the magnetorheological fluid housing 4 .

[0046] The variable damping tension component also includes: a magnetorheological fluid damper end cover 8, which is fixedly connected to the magnetorheological fluid housing 4. The magnetorheological fluid damper end cover 8 is made of non-magnetic material to prevent the magnetic field generated by the magnetorheological fluid damper control coil 16 from diverging axially from the magnetorheological fluid damper end cover 8 to avoid magnetic field interference between the super magnetostrictive control coil 10 and the magnetorheological fluid damper control coil 16 after power is turned on.

[0047] The magnetorheological fluid damper end cover 8 has a through hole inside, and the magnetorheological fluid damper shaft 6 is sealed with the inner surface of the through hole of the magnetorheological fluid damper end cover 8 via a magnetorheological fluid damper dynamic sealing ring 14. The magnetorheological fluid damper dynamic sealing ring 14 provides sealing and guidance for the magnetorheological fluid damper shaft 6 to slide and displace inside the magnetorheological fluid damper end cover 8.

[0048] The variable damping tension assembly also includes: a super magnetostrictive shell 9, which is made of magnetic conductive material, and the magnetorheological fluid damper end cover 8 and the super magnetostrictive shell 9 are fixedly connected to the magnetorheological fluid shell 4 via the magnetorheological fluid damper end cover fixing bolts 15; a threaded step through hole is provided inside the super magnetostrictive shell 9, and a rare earth super magnetostrictive shaft 12 is installed inside the super magnetostrictive shell 9, and the rare earth super magnetostrictive shaft 12 is made of rare earth super magnetic material;

[0049] A connecting spring 13, two ends of which are installed correspondingly to the rare earth giant magnetostrictive shaft 12 and the magnetorheological fluid damping shaft 6;

[0050] The magnetorheological fluid housing 4, the magnetorheological fluid damper end cover 8, and the super magnetostrictive housing 9 are hollow and connected, and the magnetorheological fluid (MR) is filled around the connecting spring 13;

[0051] The giant magnetostrictive control coil 10 is installed outside the giant magnetostrictive housing 9. The magnetic field strength after the giant magnetostrictive control coil 10 is energized and the magnetic field strength generated by the magnetorheological fluid damper control coil 16 is energized is controlled to control the viscosity and fluidity of the magnetorheological fluid, so that the variable damping tension component can quickly provide a variable range of damping tension for multiple carbon fiber cables 3 evenly distributed at circumferential intervals.

[0052] The magnetorheological fluid damping shaft 6 is connected to the connecting spring 13 , and the connecting spring 13 is connected to the rare earth giant magnetostrictive shaft 12 . The giant magnetostrictive control coil 10 changes the tension of the connecting spring 13 , thereby changing the elastic deformation of the upper plate of the squirrel cage 1 , and further changing the stiffness of the squirrel cage 1 .

[0053] The variable damping tension assembly also includes: a preload adjusting bolt 11, which is threadedly screwed with a threaded step through hole in the giant magnetostrictive housing 9 to limit and adjust the rare earth giant magnetostrictive shaft 12.

Claims

1. A cable-stayed variable stiffness variable damping squirrel cage, characterized in that: include: Rat cage (1); A plurality of carbon fiber cables (3) are evenly distributed at circumferential intervals, and one end of the carbon fiber cables (3) is mounted on the inner surface of the squirrel cage (1); A variable damping tension component connected to the other end of the carbon fiber cable (3), the variable damping tension component quickly providing a variable range of damping tension to a plurality of carbon fiber cables (3) evenly distributed at circumferential intervals; The variable damping tension component comprises: a magnetorheological fluid housing (4), the magnetorheological fluid housing (4) being fixedly connected to the axial end of the squirrel cage (1), and a stepped through hole being provided inside the magnetorheological fluid housing (4); The magnetorheological fluid damping shaft (6) is a stepped magnetorheological fluid damping shaft (6) which can be slidably mounted inside a stepped through hole of a magnetorheological fluid housing (4); a middle shaft end surface of the magnetorheological fluid damping shaft (6) and an inner end of the magnetorheological fluid housing (4) are spaced apart and can slide relative to each other; the magnetorheological fluid housing (4) and the magnetorheological fluid damping shaft (6) are filled with magnetorheological fluid; A magnetorheological fluid damper control coil (16) is installed outside the magnetorheological fluid housing (4), and the other end of the carbon fiber cable (3) is fixedly connected to the magnetorheological fluid damping shaft (6) of the variable damping tension component; The variable damping tension component further comprises: a magnetorheological fluid damper end cover (8), the magnetorheological fluid damper end cover (8) is fixedly connected to the magnetorheological fluid housing (4), and the magnetorheological fluid damper end cover (8) is made of a non-magnetic conductive material; a through hole is provided inside the magnetorheological fluid damper end cover (8), and the magnetorheological fluid damper shaft (6) is sealed with the inner surface of the through hole of the magnetorheological fluid damper end cover (8) via a magnetorheological fluid damping dynamic sealing ring (14); The variable damping tension assembly also includes: a giant magnetostrictive housing (9), a magnetorheological fluid damper end cover (8) and the giant magnetostrictive housing (9) are fixedly connected to the magnetorheological fluid housing (4) via a magnetorheological fluid damper end cover fixing bolt (15); a threaded step through hole is provided inside the giant magnetostrictive housing (9), and a rare earth giant magnetostrictive shaft (12) is installed inside the giant magnetostrictive housing (9); A connecting spring (13), wherein two ends of the connecting spring (13) are installed correspondingly to the rare earth giant magnetostrictive shaft (12) and the magnetorheological fluid damping shaft (6); The hollow interiors of the magnetorheological fluid housing (4), the magnetorheological fluid damper end cover (8), and the super magnetostrictive housing (9) are connected, and the magnetorheological fluid is filled around the outer periphery of the connecting spring (13); A giant magnetostrictive control coil (10) is installed outside the giant magnetostrictive housing (9).

2. The cable-stayed variable stiffness variable damping squirrel cage according to claim 1, characterized in that: The squirrel cage (1) has an articulated seat installed on the inner surface of the web, a cable pin (2) is rotatably installed on the articulated seat, the cable pin (2) is provided with a through hole for a carbon fiber cable (3) to pass through, and the end of the carbon fiber cable (3) passing through the cable pin (2) is fixed with a cable end limit sleeve (19).

3. The cable-stayed variable stiffness variable damping squirrel cage according to claim 1, characterized in that: The variable damping tension component is mounted on the axial end of the squirrel cage (1).

4. The cable-stayed variable stiffness variable damping squirrel cage according to claim 1, characterized in that: The magnetorheological fluid damping shaft (6) is provided with an annular groove for mounting a magnetorheological fluid damping shaft guide ring (17).

5. The cable-stayed variable stiffness variable damping squirrel cage according to claim 1, characterized in that: The magnetorheological fluid housing (4) is provided with two threaded through holes which are correspondingly screwed and tightly mounted with a liquid injection screw (5) and a liquid outlet screw (7).

6. The cable-stayed variable stiffness variable damping squirrel cage according to claim 1, characterized in that: The variable damping tension component also includes a preload adjusting bolt (11), which is threadedly screwed into the threaded step through hole in the giant magnetostrictive housing (9).

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