Elastic supporting structure of mouse cage

Abstract

The utility model provides a mouse cage elastic supporting structure which comprises a first mouse cage part and a second mouse cage part. Wherein the first mouse cage part comprises a plurality of first cage bars. The second squirrel cage part comprises a plurality of second cage bars. The first cage bar is provided with an adjusting part, and the second cage bar is provided with an adjusting matching part. The adjusting part is matched with the adjusting matching part, so that the effective cage bar length of the mouse cage elastic supporting structure is changed, and the radial rigidity of the mouse cage elastic supporting structure is further adjusted. The radial rigidity of the mouse cage elastic supporting structure can be adjusted.

Description

TECHNICAL FIELD

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

[0002] Modern aero-engines generally set up elastic support and extrusion 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 the occurrence of faults such as aero-engine rotor-stator rub, bearing wear and seizure, shaft breakage, etc. Therefore, the critical speed of aero-engine rotor system should be adjusted away from its working speed and keep a certain safety margin.

[0003] The squirrel cage elastic support belongs to a common elastic support. The squirrel cage elastic support can adjust the radial stiffness of the support by changing the number and size of the bars, thereby adjusting the critical speed of the aero-engine rotor system. The radial stiffness of the squirrel cage elastic support with a certain number and size of bars is a constant. In the test of aero-engine rotor system, multiple sets of squirrel cage elastic supports with different radial stiffness need to be designed and processed to determine the squirrel cage elastic support with appropriate radial stiffness for the rotor system, which is high in design and processing cost. At the same time, different test pieces need to be designed with squirrel cage elastic supports containing different numbers or sizes of bars, and the probability of mutual borrowing of squirrel cage elastic supports in different tests is relatively low, thereby leading to a relatively large project development cost. SUMMARY

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

[0005] One aspect of the utility model provides a squirrel cage elastic support structure, comprising a first squirrel cage part and a second squirrel cage part; wherein the first squirrel cage part comprises a plurality of first bars; the second squirrel cage part comprises a plurality of second bars; the first bars are provided with an adjusting part, and the second bars are provided with an adjusting matching part; the adjusting part and the adjusting matching part are matched, so that the effective bar length of the squirrel cage elastic support structure changes, thereby adjusting the radial stiffness of the squirrel cage elastic support structure.

[0006] In an embodiment, the first bars extend in the axial direction, and a plurality of the first bars are arranged at intervals in the circumferential direction; and / or the second bars extend in the axial direction, and a plurality of the second bars are arranged at intervals in the circumferential direction.

[0007] In an embodiment, the first bars and the second bars are in the shape of a cylinder.

[0008] In an embodiment, the adjustment portion of the first cage bar is a first threaded portion, and the adjustment mating portion of the second cage bar is a second threaded portion; the first threaded portion and the second threaded portion are matched to adjust the relative position between the first cage bar and the second cage bar.

[0009] In an embodiment, the axial length of the first threaded portion is equal to the axial length of the second threaded portion.

[0010] In an embodiment, the first threaded portion is arranged on the outer circumferential wall of the first cage bar; and the second threaded portion is arranged on the inner circumferential wall of the second cage bar.

[0011] In an embodiment, the outer diameter of the first cage bar is equal to the inner diameter of the second cage bar.

[0012] In an embodiment, the first threaded portion is arranged on the inner circumferential wall of the first cage bar; and the second threaded portion is arranged on the outer circumferential wall of the second cage bar.

[0013] In an embodiment, the inner diameter of the first cage bar is equal to the outer diameter of the second cage bar.

[0014] In an embodiment, the squirrel cage elastic supporting structure further comprises a first damping ring and a second damping ring; a plurality of the first cage bars are arranged on the first damping ring, and a plurality of the second cage bars are arranged on the second damping ring; the first threaded portion is arranged on the first end of the first cage bar, and the second end of the first cage bar opposite to the first end is provided with a counterbore; the first damping ring is provided with a mounting hole and a counterbore, and the first cage bar passes through the mounting hole; the counterbore receives the counterbore, and is stopped by the surface of the first damping ring away from the first cage bar.

[0015] In an embodiment, the squirrel cage elastic supporting structure further comprises a cover plate and a fastener; the cover plate is connected with the first damping ring through the fastener.

[0016] The squirrel cage elastic supporting structure of the utility model changes the axial size of the structure by matching the first cage bar and the second cage bar, adjusts the radial stiffness, and further ensures that the critical speed of the rotor system of the aero-engine test piece avoids the working speed range, and ensures the safe operation of the test piece. Meanwhile, the squirrel cage elastic supporting structure of the utility model has certain universality and compatibility, can be adapted to different test pieces, breaks through the limitation that the traditional squirrel cage elastic supporting structure is only applicable to specific test pieces, and reduces the project development cost to a certain extent. BRIEF DESCRIPTION OF DRAWINGS

[0017] 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:

[0018] Figure 1 is a schematic view of a first squirrel cage portion of the squirrel cage elastic support structure shown in FIG. 1;

[0019] Figure 2 is a schematic view of a first cage bar of the first squirrel cage portion shown in FIG. 1; Figure 1

[0020] Figure 3 is a schematic view of a second squirrel cage portion of the squirrel cage elastic support structure shown in FIG. 1; Figure 2

[0021] Figure 4 is a schematic view of another embodiment of the squirrel cage elastic support structure according to the present application;

[0022] Figure 5 is a schematic view of a three-dimensional structure of the squirrel cage elastic support structure shown in FIG. 1; Figure 4

[0023] is a sectional view of the first cage bar of the first squirrel cage portion of the squirrel cage elastic support structure shown in FIG. 1; Figure 6 Figure 4

[0024] Figure 7 is a sectional view of a fastener of the first squirrel cage portion of the squirrel cage elastic support structure shown in FIG. 1; Figure 4

[0025] is a sectional view of the second cage bar of the second squirrel cage portion shown in FIG. 1; Figure 8 Figure 1 is a matching schematic view of the first cage bar shown in FIG. 1 and the second cage bar shown in FIG. 1.

[0026] Figure 9 Figure 4

[0027] Figure 10 Figure 3 Figure 5 DETAILED DESCRIPTION

[0028] Modern aeroengines generally have an elastic support or multiple elastic supports provided with squeeze film dampers at a support point. The elastic support is a support structure mainly used for adjusting and controlling the critical speed of a rotor; the damper is mainly used for reducing vibration response. When the critical speed of an aeroengine rotor system is in its working speed range, it can cause the occurrence of faults such as aeroengine rotor-stator rub, bearing wear and seizure, shaft breakage, etc. Therefore, the critical speed of the aeroengine rotor system should be adjusted away from its working speed and a certain safety margin should be maintained.

[0029] ​​​​​​​​​​The squirrel cage elastic support belongs to a common elastic support. The squirrel cage elastic support can adjust the radial rigidity of the squirrel cage elastic support by changing the number and size of the cage bars, and further adjust the critical speed of the rotor system of the aero-engine. The radial rigidity of the squirrel cage elastic support with a certain number and size of cage bars is a fixed value. In the test of the aero-engine containing the rotor system, a plurality 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, and the design and processing cost is high. At the same time, different test pieces need to be designed to contain squirrel cage elastic supports with different numbers or sizes of cage bars, and the probability of mutual use of the squirrel cage elastic supports in different tests is relatively low, thereby causing a relatively large project development cost.

[0030] The radial rigidity of the traditional squirrel cage elastic support with a certain number and size of cage bars is a fixed value, and the radial rigidity of the traditional squirrel cage elastic support cannot be adjusted. A large number of squirrel cage elastic supports with different numbers and sizes of cage bars are needed to adjust the critical speed of the rotor system of the aero-engine test piece, so as to ensure the safety of the aero-engine test piece, which makes the probability of mutual use of the traditional squirrel cage elastic support between different test pieces relatively low, and the commonality is poor.

[0031] 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.

[0032] The term "axial" is the direction of the center axis of the squirrel cage elastic support structure or parallel to the center axis of the squirrel cage elastic support structure, and the term "circumferential" is the direction around the "axial" direction. As used herein, the terms "first" and "second" can be used interchangeably to distinguish one component from another component, and are not intended to represent the position or importance of the respective components.

[0033] The term "rotor cage" is a squirrel 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 rigidity.

[0034] Figure 1An embodiment of the squirrel cage elastic support structure 10 is shown. Figure 1 As shown in the figure, the squirrel cage elastic support structure 10 includes two parts, which are a first squirrel cage part 100 and a second squirrel cage part 200. The first squirrel cage part 100 or the second squirrel cage part 200 is connected with a rotor shaft (not shown).

[0035] Figure 2 The structure of the first squirrel cage part 100 is shown. Figure 2 As shown in the figure, the first squirrel cage part 100 includes a plurality of first bars 110 and a first damping ring 120, and the plurality of first bars 110 are arranged on the first damping ring 120. Each first bar 110 extends in the axial direction, and the plurality of first bars 110 are arranged in the circumferential direction of the first damping ring 120, so that the radial force from each direction can be uniformly dispersed, and stress concentration can be avoided.

[0036] Figure 4 The structure of the second squirrel cage part 200 is shown. Figure 4 As shown in the figure, the second squirrel cage part 200 includes a plurality of second bars 210 and a second damping ring 220, and the plurality of second bars 210 are arranged on the second damping ring 220. Each second bar 210 extends in the axial direction, and the plurality of second bars 210 are arranged in the circumferential direction of the second damping ring 220, so that the radial force from each direction can be uniformly dispersed, and stress concentration can be avoided.

[0037] The first bar 110 is provided with an adjusting part, and the second bar 210 is provided with an adjusting matching part. The adjusting part of the first bar 110 and the adjusting matching part of the second bar 210 are matched, so that the effective bar length L of the squirrel cage elastic support structure changes, and the radial stiffness of the squirrel cage elastic support structure is adjusted. As shown in the figure, Figure 6 The effective bar length L represents the overall length of the first bar 110 and the second bar 210 after matching, that is, the distance between the first damping ring 120 and the second damping ring 220.

[0038] The squirrel cage elastic support structure 10 of the utility model changes the axial dimension of the structure by matching the first bar 110 and the second bar 210, adjusts the radial stiffness, and further ensures that the critical speed of the rotor system of the aero-engine test piece avoids the working speed range, and ensures the safe operation of the test piece. At the same time, the squirrel cage elastic support structure of the utility model has certain universality and compatibility, can adapt to different test pieces (understood as rotor shafts), breaks through the limitation that the traditional squirrel cage elastic support structure is only applicable to specific test pieces, and reduces the project development cost to a certain extent.

[0039] Reference Figure 1The first cage bar 110 and the second cage bar 210 are in a cylindrical shape, the mechanical properties of the cylindrical cage bar in each direction are relatively uniform, the cylindrical cage bar has a high anti-deformation capacity, and the cylindrical cage bar is relatively easy to manufacture and reduces the manufacturing cost.

[0040] Further, the adjusting part of the first cage bar 110 is a first threaded part 111, and the adjusting matching part of the second cage bar 210 is a second threaded part 211. The first threaded part 111 and the second threaded part 211 are matched to adjust the relative position between the first cage bar 110 and the second cage bar 210, and then the axial length of the squirrel cage elastic supporting structure 10 can be adjusted, and the first squirrel cage part 100 and the second squirrel cage part 200 can be assembled together through the first cage bar 110 and the second cage bar 210 through threaded connection. Alternatively, the axial length of the first threaded part 111 is equal to the axial length of the second threaded part 211.

[0041] Reference Figures 4 to 7 In an embodiment, the first end of the first cage bar 110 is provided with the first threaded part 111, and the second end of the first cage bar 110 opposite to the first end has a counterbore 112, as shown in Figure 6 The first cage bar 110 can be understood as a bolt with a screw head. The first damping ring 120 is provided with a mounting hole and a counterbore. The mounting hole is matched with the first cage bar 110. When the first cage bar 110 is assembled, the first cage bar 110 passes through the mounting hole, the counterbore 112 is received by the counterbore, and is stopped by the surface of the first damping ring 120 away from the first cage bar 110.

[0042] In combination Figure 4 and Figure 7 , the squirrel cage elastic supporting structure further comprises a cover plate 130 and a fastener 140. Specifically, the first damping ring 120 is sleeved with the cover plate 130, and the cover plate 130 prevents the axial movement of the first cage bar 110. The cover plate 130 is connected with the first damping ring 120 through the fastener 140. Further, the cover plate 130 and the first damping ring 120 are matched with a stopper to ensure that the cover plate 130 and the first damping ring 120 are concentric. The fastener 140 can be a screw.

[0043] After the cover plate 130 and the fastener 140 are removed, the first cage bar 110 can be axially moved, each first cage bar 110 can be connected with a corresponding second cage bar 210, and then the connection between the first squirrel cage part 100 and the second squirrel cage part 200 can be realized. After the connection between the first squirrel cage part 100 and the second squirrel cage part 200 is completed, the cover plate 130 and the fastener 140 can be assembled.

[0044] The threaded connection is relatively simple. The relative position between the two can be easily changed by simply rotating the first cage bar 110 or the second cage bar 210. There is no need to use complicated tools or perform tedious disassembly and assembly operations, which greatly improves the convenience and efficiency of adjustment. At the same time, the thread has a specific pitch, which allows for precise fine-tuning during the adjustment process, thereby accurately controlling the axial length of the squirrel cage elastic support structure 10 and enabling precise adjustment of the radial stiffness of the squirrel cage elastic support structure 10.

[0045] Compared to the traditional squirrel cage elastic support, this utility model adds a simple adjustable stiffness structure, namely the first threaded part 111 and the second threaded part 211, the first squirrel cage part 100 and the second squirrel cage part 200 are connected by threads, and the axial dimension of the cage bar (along the engine axis) can be changed by adjusting the contact area S of the threaded connection.

[0046] In one specific embodiment, the first threaded portion 111 is disposed on the outer peripheral wall of the first cage bar 110, such as... Figure 3 As shown. The second cage bar 210 has a hollow cylindrical structure, and the second threaded portion 211 is provided on the inner peripheral wall of the second cage bar 210, as shown. Figure 5 As shown.

[0047] In this embodiment, the outer diameter of the first cage bar 110 is equal to the inner diameter of the second cage bar 210.

[0048] In another specific embodiment, a first threaded portion 111 is disposed on the inner peripheral wall of the first cage bar 110. A second threaded portion 211 is disposed on the outer peripheral wall of the second cage bar 210.

[0049] In this embodiment, the inner diameter of the first cage bar 110 is equal to the outer diameter of the second cage bar 210 to achieve a threaded fit.

[0050] The elastic support structure 10 of this utility model for a rat cage can change its radial stiffness by altering the effective cage bar length L. For example... Figure 6 As shown, the effective cage bar length L is related to the contact area S of the threaded connection between the first cage bar 110 and the second cage bar 210. The smaller the contact area S of the threaded connection between the first cage bar 110 and the second cage bar 210, the longer the effective cage bar length L, and thus the smaller the radial stiffness of the elastic support structure 10 of the rat cage of this invention; the larger the contact area S of the threaded connection between the first cage bar 110 and the second cage bar 210, the shorter the effective cage bar length L, and thus the greater the radial stiffness of the elastic support structure 10 of the rat cage of this invention.

[0051] From the technical scheme of the squirrel-cage elastic supporting structure 10 of the utility model can see, the squirrel-cage elastic supporting structure 10 of adjustable rigidity does not need to match the squirrel-cage elastic supporting of different cage bar number and size through producing a large number to have suitable radial rigidity, makes the critical speed of aero-engine rotor system avoid working speed interval, has reduced design, processing cost. Can through the way of the thread of the inner cage bar and the outer cage bar in the rotating cage bar structure, adjustment squirrel-cage elastic supporting's radial rigidity is required radial rigidity of aero-engine test piece rotor system, ensures aero-engine test piece rotor system safe operation.

[0052] The squirrel-cage elastic supporting structure 10 of the utility model fully considers the universality and compatibility on structure design, so that multiple types, different specifications test pieces can be adapted and use this squirrel-cage elastic supporting structure 10 when carrying out relevant test, improve the probability of mutual borrowing squirrel-cage elastic supporting structure 10 between different test pieces, reduce the project development cost to a certain extent.

[0053] The utility model discloses although the above-mentioned preferable embodiment is disclosed, but it is not used to limit the utility model, 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 embodiment according to the technical essence of the utility model, all fall within the protection scope defined by the utility model claims.

Claims

1. A squirrel-cage elastic support structure, characterized by, The first squirrel cage portion comprises a plurality of first bars; The first bars are provided with an adjusting portion, and the second bars are provided with an adjusting mating portion; The adjusting portion and the adjusting mating portion are matched, so that the effective bar length of the squirrel cage elastic support structure is changed, thereby adjusting the radial stiffness of the squirrel cage elastic support structure. The first bars extend in the axial direction, and a plurality of the first bars are arranged in the circumferential direction; and / or The second bars extend in the axial direction, and a plurality of the second bars are arranged in the circumferential direction; and / or 2. The squirrel-cage elastic support structure of claim 1, wherein The first bars and the second bars are in a cylindrical shape. The adjusting portion of the first bars is a first threaded portion, and the adjusting mating portion of the second bars is a second threaded portion; The first threaded portion and the second threaded portion are matched to adjust the relative position between the first bars and the second bars.

3. The squirrel cage spring support structure of claim 2, wherein, The axial length of the first threaded portion is equal to the axial length of the second threaded portion. The first threaded portion is arranged on the outer peripheral wall of the first bars; 4. The squirrel-cage elastic support structure of claim 3, wherein The second threaded portion is arranged on the inner peripheral wall of the second bars.

5. The squirrel-cage elastic support structure according to claim 3 or 4, characterized in that The outer diameter of the first bars is equal to the inner diameter of the second bars. The first threaded portion is arranged on the inner peripheral wall of the first bars; 6. The squirrel-cage elastic support structure of claim 5, wherein The second threaded portion is arranged on the outer peripheral wall of the second bars.

7. The squirrel-cage elastic support structure according to claim 3 or 4, wherein The inner diameter of the first bars is equal to the outer diameter of the second bars. The squirrel cage elastic support structure further comprises a first damping ring and a second damping ring, a plurality of the first bars are arranged on the first damping ring, and a plurality of the second bars are arranged on the second damping ring; 8. The squirrel-cage elastic support structure of claim 7, wherein The first end of the first bars is provided with the first threaded portion, and the second end of the first bars opposite to the first end has a counterbore; 9. The squirrel cage spring support structure of claim 3 wherein, The first damping ring is provided with a mounting hole and a counterbore, and the first bars pass through the mounting hole; The counterbore receives the counterbore, and is stopped by the surface of the first damping ring away from the first bars. The squirrel cage elastic support structure further comprises a cover plate and a fastener; The cover plate is connected to the first damping ring through the fastener.

10. The squirrel cage spring support structure of claim 9, wherein, ​ ​

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