Elastic supporting device for mouse cage

Abstract

The utility model provides a mouse cage elastic supporting device which comprises a mouse cage supporting structure, an adjusting structure and a connecting structure. Wherein the first end of the squirrel cage supporting structure is connected with the connecting structure, and the connecting structure is connected with the casing. The adjusting structure is fixed relative to the mouse cage supporting structure and assembled on the periphery of the mouse cage supporting structure, and the adjusting structure covers at least one part of the mouse cage supporting structure. The mouse cage supporting structure is configured to move in the axial direction relative to the adjusting structure when the second end of the mouse cage supporting structure is subjected to acting force, so that the covering area of the adjusting structure on the mouse cage supporting structure is changed, and then the radial rigidity of the mouse cage supporting structure is adjusted. The radial rigidity of the mouse cage elastic supporting structure can be changed.

Description

TECHNICAL FIELD

[0001] The utility model relates to aero-engine field especially relates to a squirrel cage elastic support device. BACKGROUND

[0002] Modern aero-engine generally sets up elastic support and extrusion oil film damper at a fulcrum or multiple fulcrums.Elastic support is a kind of support structure, mainly used for adjusting and controlling rotor critical speed;Damper is mainly used for reducing vibration response.When the critical speed of aero-engine rotor system is in its working speed range, it may cause aero-engine rotor-stator rub, bearing wear and seizure, shaft breakage and other faults.The critical speed of aero-engine rotor system should be adjusted away from its working speed and keep a certain safety margin.

[0003] Squirrel cage elastic support belongs to common elastic support.Squirrel cage elastic support can adjust the radial stiffness of its support by changing the number and size of bars, and then adjust the critical speed of aero-engine rotor system.The radial stiffness of squirrel cage elastic support with certain number and size of bars is a constant value.In various tests of aero-engine with rotor system, multiple sets of squirrel cage elastic support with different radial stiffness need to be designed and processed to determine the squirrel cage elastic support with appropriate radial stiffness for rotor system, which has high cost of design, processing, assembly and test, and low efficiency, time-consuming and laborious.Meanwhile, there are problems such as non-continuous change of radial stiffness of squirrel cage elastic support, difficulty in keeping the assembly and installation state of flexible rotor system consistent before and after, etc., that is, replacing squirrel cage elastic support will introduce some nonlinear factors and affect the test results. SUMMARY

[0004] The utility model aims at providing a squirrel cage elastic support device, which can adjust the radial stiffness.

[0005] One aspect of the utility model provides a squirrel cage elastic support device, which comprises a squirrel cage support structure, an adjusting structure and a connecting structure; wherein the first end of the squirrel cage support structure is connected with the connecting structure, and the connecting structure is connected with a casing; the adjusting structure is fixed relative to the squirrel cage support structure and assembled on the outer periphery of the squirrel cage support structure, and the adjusting structure covers at least a part of the squirrel cage support structure; the squirrel cage support structure is configured to move axially relative to the adjusting structure when the second end thereof is subjected to a force, so as to change the coverage area of the adjusting structure on the squirrel cage support structure, and then adjust the radial stiffness of the squirrel cage support structure.

[0006] In an embodiment, the squirrel cage support structure comprises a plurality of bars, and the plurality of bars connect the first end and the second end of the squirrel cage support structure.

[0007] In an embodiment, the plurality of bars are evenly spaced circumferentially.

[0008] In an embodiment, the axial length of the bars is greater than or equal to the axial length of the adjustment structure.

[0009] In an embodiment, the adjustment structure is a bearing seat, the bearing seat is sleeved outside the squirrel cage support structure, and the bearing seat is connected with the case.

[0010] In an embodiment, the bearing seat has a cylindrical portion for accommodating the squirrel cage support structure; the squirrel cage support structure is axially movable under the guidance of the cylindrical portion.

[0011] In an embodiment, the squirrel cage support structure has an inner circumferential wall, the inner circumferential wall circumscribes the cylindrical portion; the diameter of the cylindrical portion is consistent with the outer diameter of the squirrel cage support structure, and the inner circumferential wall of the cylindrical portion is capable of sliding contact with the outer circumferential wall of the squirrel cage support structure.

[0012] In an embodiment, the connection structure connects the first end of the squirrel cage support structure with the case.

[0013] In an embodiment, there is a gap between the connection structure and the bearing seat.

[0014] In an embodiment, the first end of the squirrel cage support structure is provided with a mounting edge; the mounting edge is provided with a plurality of mounting holes arranged at intervals; the connection structure is provided with an opening hole matched with the mounting hole; a fastener passes through the mounting hole and the opening hole, thereby fastening the first end of the squirrel cage support structure and the connection structure.

[0015] The squirrel cage elastic support device of the utility model can change the covering area of the adjustment structure on the squirrel cage support structure when the squirrel cage support structure is subjected to the force from the rotor, thereby changing the effective bar length of the squirrel cage support structure and adjusting the radial stiffness, so that the critical speed of the rotor system with obvious vibration response can be avoided in the running state of the aero-engine or the test piece thereof, and the safe running of the aero-engine or the test piece thereof is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and other features, properties, and advantages of the utility model will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0017] Figure 1 is a schematic view of an embodiment of the squirrel cage elastic support device according to the utility model. DETAILED DESCRIPTION

[0018] Modern aero-engine generally sets elastic support and squeeze oil film damper at one fulcrum or multiple fulcrums. The elastic support is a kind of support structure, mainly used for adjusting and controlling the critical speed of rotor; the damper is mainly used for reducing vibration response. When the critical speed of aero-engine rotor system is in its working speed range, it may cause aero-engine rotor-stator rub-impact, bearing wear and seizure, shaft breakage and other faults. Therefore, the critical speed of aero-engine rotor system should be adjusted away from its working speed, and a certain safety margin should be kept.

[0019] The squirrel-cage elastic support belongs to a common elastic support. The squirrel-cage elastic support can adjust the radial rigidity of the support by changing the number and size of the bars, and then adjust the critical speed of the aero-engine rotor system. The radial rigidity of the squirrel-cage elastic support with a certain number and size of bars is a constant value. In various tests of aero-engine rotor systems, multiple sets of squirrel-cage elastic supports with different radial rigidities need to be designed and processed to determine the squirrel-cage elastic support with appropriate radial rigidity for the rotor system. The design, processing, assembly, testing cost is high, and the efficiency is low. At the same time, there are problems such as the radial rigidity of the squirrel-cage elastic support cannot be continuously changed, and the flexible rotor system assembly state is difficult to keep consistent before and after assembly, that is, replacing the squirrel-cage elastic support will introduce some nonlinear factors and affect the test results.

[0020] The radial rigidity of the traditional squirrel-cage elastic support is a constant value with a certain number and size of bars. The radial rigidity of the traditional squirrel-cage elastic support cannot be adjusted, and a large number of squirrel-cage elastic supports with different numbers and sizes of bars are needed to adjust the critical speed of the rotor system of the aero-engine or its test piece, so as to ensure the safety of the aero-engine. The traditional squirrel-cage elastic support cannot adjust the radial rigidity of the squirrel-cage elastic support in the running state of the aero-engine or its test piece, which makes the traditional squirrel-cage elastic support unable to avoid the critical speed of the rotor system with obvious vibration response in the running state of the aero-engine or its test piece, and affects the safety of the aero-engine or its test piece.

[0021] Reference will now be made in detail to the embodiments of the present application, one or more examples of which are illustrated in the drawings. Each example is provided by way of explanation of the present application, not limitation of the present application. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the scope or spirit of the present application. For example, features shown or described as part of one embodiment can be used with another embodiment to yield a still further embodiment. Thus, it is intended that the present application cover modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.

[0022] The term "axial" is the direction of the center axis of the rotor cage elastic support structure or parallel to the center axis of the rotor cage elastic support structure, and the term "circumferential" is around the direction of "axial". As used herein, the terms "first" and "second" can be used interchangeably to distinguish one component from another, and are not intended to indicate the position or importance of the respective components.

[0023] The term "rotor cage" is a rotor cage elastic support structure in an aero-engine. The term "elastic support" is a support structure with lower rigidity than the rotor shaft. The term "adjustable stiffness structure" is a structure that can adjust the change of stiffness.

[0024] Figure 1 An embodiment structure of the rotor cage elastic support device of the utility model is shown. As shown in Figure 1 The rotor cage elastic support device of the utility model comprises a rotor cage support structure 100, an adjusting structure 200 and a connecting structure 300. The first end 101 of the rotor cage support structure 100 is connected with the connecting structure 300, and the connecting structure 300 is connected with the casing (not shown). The adjusting structure 200 is fixed relative to the rotor cage support structure 100 and is assembled on the outer periphery of the rotor cage support structure 100, and the adjusting structure 200 covers at least a part of the rotor cage support structure 100. The rotor cage support structure 100 is configured to move axially relative to the adjusting structure 200 when the second end 102 thereof is subjected to an acting force, so as to change the covering area of the adjusting structure 200 on the rotor cage support structure 100, and further adjust the radial stiffness of the rotor cage support structure.

[0025] The rotor cage elastic support device of the utility model can change the effective bar length of the rotor cage support structure 100 by moving relative to the adjusting structure 200 when the rotor cage support structure 100 is subjected to the acting force from the rotor, so as to adjust the radial stiffness of the rotor cage support structure 100, and can avoid the critical speed of the rotor system with obvious vibration response in the running state of the aero-engine or the test piece thereof, so as to ensure the safe running of the aero-engine or the test piece thereof.

[0026] It should be noted that the effective bar length, as shown in Figure 1 represents the axial length of the part of the bar 110 that is not covered by the adjusting structure 200 and exposed outside.

[0027] The force acting on the second end 102 of the rotor cage support structure 100 can be an external force such as the rotor axial force, cavity pressure and the like of the aero-engine or the test piece thereof in the running state, so as to adjust the critical speed of the rotor system.

[0028] In an embodiment, the connecting structure 300 connects the first end 101 of the squirrel cage supporting structure 100 and the machine case, so that the squirrel cage elastic supporting device of the utility model and the machine case are connected. The connecting structure 300 is connected with the machine case and extends inward. Optionally, the connecting structure 300 is threadedly connected with the first end 101 of the squirrel cage supporting structure 100.

[0029] Specifically, the first end 101 of the squirrel cage supporting structure 100 is provided with a mounting edge 120. The mounting edge 120 is provided with a plurality of mounting holes arranged at intervals. The connecting structure 300 is provided with an opening hole matched with the mounting holes. A fastener passes through the mounting holes and the opening hole, thereby fastening the first end 101 of the squirrel cage supporting structure 100 and the connecting structure 300. The fastener includes a bolt 410 and a nut 420.

[0030] By tightening the bolt 410 and the nut 420, a large pre-tightening force can be generated between the first end 101 of the squirrel cage supporting structure 100 and the connecting structure 300, so that the two are tightly connected. The threaded connection is relatively simple, and the entire process does not require complex tools and special processes, and the operation is relatively simple and has strong versatility.

[0031] The adjusting structure 200 is a bearing seat, which is sleeved outside the squirrel cage supporting structure 100 and connected with the machine case. The bearing seat can be a part of the machine case extending inward and assembled with the connecting structure 300 at the first end 101 of the squirrel cage supporting structure 100.

[0032] The bearing seat has a cylindrical portion for accommodating the squirrel cage supporting structure 100. The squirrel cage supporting structure 100 can move axially under the guidance of the cylindrical portion. The squirrel cage supporting structure 100 has an inner peripheral wall that encloses the cylindrical portion. The diameter of the cylindrical portion is consistent with the outer diameter of the squirrel cage supporting structure 100, and the inner peripheral wall of the cylindrical portion can be in sliding contact with the outer peripheral wall of the squirrel cage supporting structure 100. The squirrel cage supporting structure 100 can freely slide relative to the bearing seat, and the frictional resistance between the two is small, so that the squirrel cage supporting structure 100 can quickly respond and slide under the action of force.

[0033] The connecting structure 300 and the bearing seat have a gap therebetween, which avoids interference between the connecting structure 300 and the bearing seat and affects the change of the effective bar length L of the squirrel cage supporting structure 100.

[0034] Continuing to refer to Figure 1The squirrel cage supporting structure 100 includes a plurality of bars 110 connecting the first end 101 and the second end 102 of the squirrel cage supporting structure 100, i.e. the plurality of bars 110 are arranged between the first end 101 and the second end 102. The plurality of bars 110 collectively bear the load acting on the squirrel cage supporting structure 100, dispersing the force to each bar 110, avoiding a single component bearing excessive force, thereby enhancing the strength and stability of the entire structure, enabling it to withstand greater external force and weight. At the same time, the plurality of bars 110 cooperate with each other, so that even if an individual bar 110 has a problem, other bars 110 can still maintain the basic function of the structure to a certain extent, improving the reliability and fault tolerance of the entire squirrel cage supporting structure 100, and reducing the probability of overall structure failure due to failure of a single component.

[0035] Further, the plurality of bars 110 are uniformly spaced in the circumferential direction, so that the external force acting on the squirrel cage supporting structure 100 can be uniformly transmitted to each bar 110, avoiding excessive local stress and stress concentration. The plurality of bars 110 have the same length.

[0036] As shown in FIG. 1, Figure 1 the axial length of the bar 110 is greater than or equal to the axial length of the bearing seat, i.e. the effective bar length L is greater than or equal to zero.

[0037] The effective bar length L of the squirrel cage supporting structure 100 changes with the size and direction of the rotor axial force, and the radial stiffness in the squirrel cage elastic support will change to adjust the critical speed of the rotor system, thereby ensuring that the critical speed of the rotor system avoids the working speed range.

[0038] Specifically, when the rotor axial force acting on the second end 102 of the squirrel cage supporting structure 100 pushes in the direction close to the first end 101 (i.e. the left direction in FIG. 1), the effective bar length L will decrease. As the effective bar length L decreases, the radial stiffness of the squirrel cage supporting structure 100 will increase, and the critical speed of the rotor system will increase, so as to realize safe operation of the aero-engine or its test piece in the running process to avoid dangerous critical speed. Figure 1

[0039] When the rotor axial force acting on the second end 102 of the squirrel cage supporting structure 100 pulls in the direction away from the first end 101 (i.e. the right direction in FIG. 1), the effective bar length L will increase. As the effective bar length L increases, the radial stiffness of the squirrel cage supporting structure 100 will decrease, and the critical speed of the rotor system will decrease, so as to realize safe operation of the aero-engine or its test piece in the running process to avoid dangerous critical speed. Figure 1

[0040] ​​In combination with the above-mentioned embodiments, if the vibration of the aero-engine or the test piece thereof is large when operating, the size or direction of the rotor axial force can be changed to quickly change the radial stiffness of the squirrel-cage elastic support in the operating state of the aero-engine or the test piece thereof, to adjust the critical speed of the rotor system, and finally to ensure the safe operation of the aero-engine or the test piece thereof.

[0041] Meanwhile, the utility model does not need to match the squirrel-cage elastic support with appropriate radial stiffness by producing a large number of different cage strips 110 to avoid the critical speed of the aero-engine rotor system from the working speed interval, and reduces the design, processing, assembly and test cost, and only needs to be installed once.

[0042] The utility model discloses although the above-mentioned preferable embodiment is disclosed, but it is not used to limit the utility model, and any person skilled in the art can make possible change and modification without departing from the spirit and scope of the utility model. Therefore, any modification, equivalent change and modification made to the above-mentioned embodiments according to the technical essence of the utility model, all fall within the protection scope defined by the utility model claims.

Claims

1. A rat cage elastic support device, characterized in that, This includes the cage support structure, adjustment structure, and connection structure; among which, The first end of the cage support structure is connected to the connecting structure, and the connecting structure is connected to the casing. The adjusting structure is fixed relative to the cage support structure and is assembled on the outer periphery of the cage support structure, and the adjusting structure covers at least a portion of the cage support structure. The cage support structure is configured to move axially relative to the adjusting structure when a force is applied to its second end, thereby changing the coverage area of ​​the adjusting structure on the cage support structure and adjusting the radial stiffness of the cage support structure.

2. The elastic support device for the rat cage as described in claim 1, characterized in that, The rat cage support structure includes multiple cage bars, which connect the first end and the second end of the rat cage support structure.

3. The elastic support device for the rat cage as described in claim 2, characterized in that, The cage bars are evenly spaced along the circumference.

4. The elastic support device for the rat cage as described in claim 2, characterized in that, The axial length of the cage bars is greater than or equal to the axial length of the adjustment structure.

5. The elastic support device for a rat cage as described in any one of claims 1-4, characterized in that, The adjustment structure is a bearing housing, which is sleeved outside the squirrel cage support structure and connected to the casing.

6. The elastic support device for a rat cage as described in claim 5, characterized in that, The bearing housing has a cylindrical portion for accommodating the rat cage support structure; The cage support structure is capable of moving axially under the guidance of the cylindrical portion.

7. The elastic support device for a rat cage as described in claim 6, characterized in that, The cage support structure has an inner peripheral wall, which encloses the cylindrical portion. The diameter of the cylindrical part is the same as the outer diameter of the rat cage support structure, and the inner peripheral wall of the cylindrical part can slide in contact with the outer peripheral wall of the rat cage support structure.

8. The elastic support device for a rat cage as described in claim 5, characterized in that, The connecting structure connects the first end of the rat cage support structure and the casing.

9. The elastic support device for a rat cage as described in claim 8, characterized in that, There is a gap between the connecting structure and the bearing housing.

10. The elastic support device for a rat cage as described in claim 8, characterized in that, The first end of the rat cage support structure is provided with an installation edge; The mounting edge is provided with multiple spaced mounting holes; The connecting structure is provided with an opening that mates with the mounting hole; Fasteners pass through the mounting holes and the openings, thereby securing the first end of the cage support structure and the connecting structure.

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