Elastic supporting piece and rotor supporting system

Abstract

The invention aims to provide an elastic supporting piece and a rotor supporting system, the elastic supporting piece comprises an outer ring piece, an inner ring piece and a plurality of cage bars arranged between the outer ring piece and the inner ring piece, and each cage bar is connected with the outer ring piece and the inner ring piece. The inner ring piece extends from the outer ring piece to the inner ring piece in the first direction. Wherein the first direction is the same as the rotation direction of the rotor supported by the rotor supporting system in the working condition. The elastic supporting piece has the advantages of being compact in structure and high in twist-off resistance.

Description

Technical Field

[0001] The present invention relates to the field of aeroengines, and in particular to an elastic support member and a rotor support system. Background Art

[0002] In modern high-speed rotating machinery, such as aircraft engines, gas turbines, turbochargers, etc., the rotor often operates at the first critical speed, or even above multiple critical speeds. When the rotor is close to or accelerates through the critical speed, the rotor system will have very large vibrations. Therefore, in the prior art, elastic damping supports are often added to the rotor system. By changing the support stiffness, the critical speed of the system can be adjusted, and by increasing the damping of the support structure, the vibration of the rotor can be effectively suppressed, thereby ensuring the safe and reliable operation of the system. At present, the most widely used elastic support structures are elastic ring elastic support structures and squirrel cage elastic support structures.

[0003] Existing elastic ring elastic support structure is as shown in the attached Figure 1 As shown, there are inner bosses 912 and outer bosses 913 uniformly distributed along the circumferential direction on the inner and outer surfaces, and the positions of the inner bosses 912 and the outer bosses 913 are staggered, and the stiffness is adjusted by the number, position and height of the bosses. The elastic ring elastic support structure occupies a small space and has a compact structure, but because there are several bosses staggered on its inner and outer surfaces, its processing processability is poor. In addition, during the working process, there is wear between the inner and outer bosses and the matching structure, resulting in poor reliability of the structure. And the linearity of its stiffness is poor.

[0004] The existing squirrel cage elastic support structure is as follows Figure 2 As shown, its inner cylindrical surface is the bearing mating surface 923, which cooperates with the outer ring of the bearing, and the outer cylindrical surface is the extrusion oil film damper mating surface 925, which cooperates with the extrusion oil film bushing. The expansion ring grooves on both sides are used to install the expansion ring to seal the lubricating oil. It is fixed to the stator by the bolt hole 921 of the mounting edge end face 922. The stiffness is adjusted by controlling the size and number of the cage bars 924. The squirrel cage elastic support structure has good linear stiffness, but the axial space it occupies is large (if it is a reentry structure, the radial space it occupies is large), and the torsion resistance is poor, and a separate anti-twist-off structure needs to be set. And it is easy to produce fatigue during work, and the fatigue resistance is low.

[0005] There is an urgent need to provide an elastic support member with a compact structure and strong anti-twist fracture ability to solve the problems of the existing elastic support structure. Summary of the invention

[0006] The object of the present invention is to provide an elastic support member which has the characteristics of compact structure and strong anti-twist-off capability.

[0007] An elastic support member for achieving the above-mentioned purpose is used in a rotor support system, comprising an outer ring member, an inner ring member, and a plurality of cage bars arranged between the outer ring member and the inner ring member, each of the cage bars connecting the outer ring member and the inner ring member, and extending from the outer ring member to the inner ring member along a first direction;

[0008] The first direction is the same as the rotation direction of the rotor supported by the rotor support system in working conditions.

[0009] In one or more embodiments, the cage bar is connected to the outer ring member at a first end, the cage bar is connected to the inner ring member at a second end, and the cage bar includes a body portion and a first rounded portion located at the first end and a second rounded portion located at the second end;

[0010] The main body portion extends along the first direction, and the center of a circle in the first direction coincides with the center of a circle in the circumferential direction of the elastic support member.

[0011] In one or more embodiments, the cage bars are in an impeller structure, the main body is a blade body, and the first fillet portion and the second fillet portion are blade roots.

[0012] In one or more embodiments, along the radial direction of the elastic support member, the main body portion has an outer surface and an inner surface, and the outer surface and the inner surface are arc surfaces respectively;

[0013] The center of the circle where the outer surface extends, the center of the circle where the inner surface extends, and the center of the circle where the elastic support member extends coincide with each other.

[0014] In one or more embodiments, a mounting hole is provided in at least one of the first rounded corners.

[0015] In one or more embodiments, the number of the mounting holes is multiple, and the mounting holes are evenly distributed along the circumference of the elastic support member.

[0016] In one or more embodiments, the inner ring member has at least one convex portion, and the convex portion is protruded from the inner circumference of the inner ring member toward the inner side of the inner ring member along the radial direction of the inner ring member.

[0017] In one or more embodiments, the protrusions are arranged in pairs, and an anti-rotation groove is formed between the pair of protrusions.

[0018] In one or more embodiments, the plurality of cage bars are evenly distributed along the circumference of the elastic support member.

[0019] In one or more embodiments, the outer surface of the outer ring is a cylindrical surface, and the inner surface of the inner ring is a cylindrical surface.

[0020] On the other hand, according to some embodiments of the present application, a rotor support system is further provided, which includes a bearing seat and a bearing, wherein the bearing is connected to the bearing seat via the elastic support member as described above.

[0021] The beneficial effects of the present invention are:

[0022] By providing cage bars having an extension direction which is the same as the rotation direction of the rotor in working conditions, the elastic support member occupies a small space in the engine, has a compact structure, has high reliability, and is conducive to a lightweight design of the structure. At the same time, the torsional resistance of the entire elastic support member is greatly improved, and there is no need to provide a special anti-twist-off structure for the elastic support member, and the cage bars have high fatigue resistance.

[0023] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0025] Figure 1 A schematic diagram showing an existing elastic ring type elastic support structure;

[0026] Figure 2 A schematic diagram of an existing squirrel cage elastic support structure is shown;

[0027] Figure 3 A half-section schematic diagram of some embodiments of the rotor support system is shown;

[0028] Figure 4 Shows front schematic diagrams of some embodiments of the elastic support member;

[0029] Figure 5 Shows three-dimensional schematic diagrams of some embodiments of the elastic support member;

[0030] Figure 6 as well as Figure 7 A half-section schematic diagram of the elastic support member in an assembled state is shown;

[0031] Figures 8 to 10 A partial enlarged schematic diagram of the elastic support member is shown. DETAILED DESCRIPTION

[0032] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0034] In order to solve the problem that the elastic support components in the existing rotor support system are easily damaged, on the one hand, according to some embodiments of the present application, a rotor support system is provided. Figure 3 A half-section schematic diagram of some embodiments of the rotor support system is shown, wherein the rotor support system includes a bearing seat 81 and a bearing 82, and the bearing is connected to the bearing seat through an elastic support member 100. In order to facilitate a deeper understanding of the structure of the rotor support system, further, in some specific embodiments, the bearing seat 81 is fixed to the casing by mounting side bolts 83, and a squeeze film damper is provided between the bearing 82 and the bearing seat 81. The elastic support member 100 can adjust the fulcrum stiffness of the fulcrum and the critical speed of the rotor system. The squeeze film damper can reduce the amplitude of the vibration caused by the unbalanced load of the rotor and the vibration of the rotor when it is over-critical, so that the rotor can work safely and stably, while ensuring that the load of the fulcrum can be effectively transmitted.

[0035] In a specific embodiment, the oil supply structure of the bearing 82 is under-ring lubrication, including a bearing inner ring 821, a bearing outer ring 825 and a rolling body 826. The bearing inner ring 821 is provided with uniformly distributed oil supply grooves 822 along the circumferential direction, and the lubricating oil flows axially in the oil supply grooves 822. The oil supply grooves 822 are provided with radial oil supply holes, so that under the action of centrifugal force, the lubricating oil is supplied to the rolling body along the radial oil supply holes. The oil supply method of the squeeze film damper is that radial oil supply holes are provided on the bearing seat 81, and the lubricating oil is supplied to the squeeze film damper along the radial direction. Sealing rings 823 are provided at both ends of the squeeze film damper, and the lubricating oil in the squeeze film damper is sealed by the sealing rings 823, and at the same time, a certain leakage amount flows out to ensure the circulation of the lubricating oil. Ventilation holes 824 are provided on the bearing seat to ensure that the oil and gas on the left and right sides of the bearing 824 can flow, which is beneficial to the ventilation and oil return performance of the entire bearing cavity.

[0036] On the other hand, according to some embodiments of the present application, there is also provided an elastic support member, which is used in the rotor support system described in the above embodiments, Figure 4 shows a front view of some embodiments of the elastic support member, Figure 5 Schematic three-dimensional views of some embodiments of the elastic support member are shown. Figure 6 as well as Figure 7 A half-section schematic diagram of the elastic support member in an assembled state is shown. Figures 8 to 10 A partial enlarged schematic diagram of the elastic support member is shown.

[0037] The elastic support member 100 includes an outer ring member 1, an inner ring member 2, and a plurality of cage bars 3 disposed between the outer ring member 1 and the inner ring member 2. Each cage bar 3 connects the outer ring member 1 and the inner ring member 2, and extends from the outer ring member 1 to the inner ring member 2 along a first direction a. The first direction a is the same as the rotation direction x of the rotor supported by the rotor support system in the working state. For example Figure 4 as well as Figure 5 As shown, the rotation direction x of the rotor supported by the rotor support system in the working condition is counterclockwise, and the first direction a is also counterclockwise. That is, for each cage bar 3, the connection between it and the outer ring member 1 is located at the upstream position of the connection between it and the inner ring member 2 in the counterclockwise direction.

[0038] During the operation of the engine, the bearing will generate friction, which is along the rotation direction of the engine rotor, and the friction will apply a torque along the rotation direction of the engine to the elastic support 100. If the bearing is stuck, the torque will be greater. Figures 4 to 5 Under the working condition shown, the inner ring 2 of the elastic support member 100 tends to rotate counterclockwise relative to the outer ring 1, and the cage bars 3 tend to be pulled. Since the extension direction of the cage bars 3 is set to be the same as the rotation direction x of the rotor in the working condition, the anti-torsion ability of the entire elastic support member 100 is greatly improved, and there is no need to set up a special anti-twist-off structure for the elastic support member 100, and the cage bars 3 have high fatigue resistance. If the extension direction of the cage bars 3 is set to be opposite to the rotation direction x of the rotor in the working condition, the cage bars 3 will be compressed, which may cause buckling and instability.

[0039] By providing the cage bars 3 with an extension direction set to be the same as the rotation direction x of the rotor in the working condition, the elastic support member 100 has a compact structure and a strong anti-twist ability. Compared with the traditional elastic support structure, the elastic support member 100 occupies a small space in the engine, has a compact structure, high reliability, is conducive to the lightweight design of the structure, and is conducive to weight reduction.

[0040] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] In some embodiments of the elastic support member, the cage bar 3 is connected to the outer ring member 1 at the first end, and the cage bar 3 is connected to the inner ring member 2 at the second end. The cage bar 3 includes a main body 30, a first rounded corner portion 31 located at the first end, and a second rounded corner portion 32 located at the second end. The main body 30 extends along the first direction a, and the center of the circle in the first direction a coincides with the center of the circle in the circumferential direction of the elastic support member 100. By providing a rounded corner structure at the root of the cage bar 3, the stress on the root of the cage bar 3 can be reduced, and the entire elastic support member 100 can be easily processed, which can be achieved by milling, and the processing technology is good.

[0042] In the description of the embodiments of the present application, the technical terms "first" and "second", such as "first rounded corner portion", "second rounded corner portion", etc., are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary and secondary relationship of the indicated technical features.

[0043] In some embodiments of the elastic support member, the cage bar 3 is in an impeller structure, the main body 30 is a blade body, and the first fillet portion 31 and the second fillet portion 32 are blade roots.

[0044] In some embodiments of the elastic support member, along the radial direction of the elastic support member 100, the main body 30 has an outer surface 301 and an inner surface 302, and the outer surface 301 and the inner surface 302 are arc surfaces. The center of the circle where the outer surface 301 extends, the center of the circle where the inner surface 302 extends, and the center of the circle where the elastic support member 100 is located coincide. This arrangement can greatly enhance the tensile strength of the cage bar 3, facilitate the adjustment of the stiffness, and is beneficial to the processing characteristics of the entire elastic support member 100.

[0045] In some embodiments of the elastic support member, a mounting hole 310 is provided in at least one of the first fillet portions 31. In some embodiments of the elastic support member, the number of mounting holes 310 is multiple, and the mounting holes are evenly distributed along the circumference of the elastic support member 100. By providing mounting holes 310 on the elastic support member 100 and circumferentially evenly arranged, the elastic support member 100 can be fixed to the bearing seat 81 by fasteners such as bolts 7 provided in the mounting holes 310, and the mounting holes 310 are integrated with the root of the cage bar 3, so there is no need to separately provide a mounting edge for the elastic support member 100, so that the axial structure is compact and easy to install, and the strength of the root of the cage bar at the location can be increased.

[0046] In some embodiments of the elastic support member, the inner ring member 2 has at least one protrusion 20 , and the protrusion 20 is arranged to protrude from the inner circumference of the inner ring member 2 toward the inner side of the inner ring member 2 along the radial direction of the inner ring member 2 .

[0047] In some embodiments of the elastic support, the protrusions 20 are arranged in pairs, and an anti-rotation groove 21 is formed between the pair of protrusions 20. The anti-rotation groove 21 cooperates with the anti-rotation boss 827 provided on the bearing outer ring 825 to position the bearing outer ring 825 during assembly and to prevent rotation during operation.

[0048] In some embodiments of the elastic support member, a plurality of cage bars 3 are evenly distributed along the circumference of the elastic support member 100. The plurality of cage bars 3 are evenly distributed in the circumferential direction, so that the elastic support member 100 has uniform stiffness in the circumferential direction, a reliable structure, and is conducive to the adjustment and vibration control of the entire rotor system.

[0049] In a specific embodiment, the outer surface of the outer ring 1 is a cylindrical structure, which matches the inner wall surface of the mounting groove on the bearing seat 81. The inner surface of the inner ring 2 is a cylindrical structure, which matches the outer ring 825 of the bearing.

[0050] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships of the connecting components in the connected state. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0051] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An elastic support member, used in a rotor support system, characterized in that: It comprises an outer ring, an inner ring and a plurality of cage bars arranged between the outer ring and the inner ring, each of the cage bars connects the outer ring and the inner ring and extends from the outer ring to the inner ring along a first direction; The first direction is the same as the rotation direction of the rotor supported by the rotor support system in working conditions.

2. The elastic support member according to claim 1, characterized in that: The cage bar is connected to the outer ring member at a first end, and is connected to the inner ring member at a second end, and the cage bar comprises a body portion, a first rounded corner portion located at the first end, and a second rounded corner portion located at the second end; The main body portion extends along the first direction, and the center of a circle in the first direction coincides with the center of a circle in the circumferential direction of the elastic support member.

3. The elastic support member according to claim 2, characterized in that: The cage bars are in an impeller structure, the main body is a blade body, and the first fillet portion and the second fillet portion are blade roots.

4. The elastic support member according to claim 2, characterized in that: Along the radial direction of the elastic support member, the main body has an outer surface and an inner surface, and the outer surface and the inner surface are arc surfaces respectively; The center of the circle where the outer surface extends, the center of the circle where the inner surface extends, and the center of the circle where the elastic support member extends coincide with each other.

5. The elastic support member according to claim 2, characterized in that: At least one of the first rounded corners is provided with a mounting hole.

6. The elastic support member according to claim 5, characterized in that: The number of the mounting holes is multiple, and the mounting holes are evenly distributed along the circumference of the elastic support member.

7. The elastic support member according to claim 1, characterized in that: The inner ring member has at least one convex portion, and the convex portion is protruded from the inner circumference of the inner ring member toward the inner side of the inner ring member along the radial direction of the inner ring member.

8. The elastic support member according to claim 7, characterized in that: The convex parts are arranged in pairs, and an anti-rotation groove is formed between the pair of convex parts.

9. The elastic support member according to claim 1, characterized in that: The plurality of cage bars are evenly distributed along the circumference of the elastic support member.

10. The elastic support member according to claim 1, characterized in that: The outer surface of the outer ring is a cylindrical surface, and the inner surface of the inner ring is a cylindrical surface.

11. A rotor support system, characterized in that: It comprises a bearing seat and a bearing, wherein the bearing is connected to the bearing seat via an elastic support member as described in any one of claims 1 to 10.

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