Elastic support and rotor support system

Abstract

The present application aims to provide a kind of elastic support and rotor support system, elastic support includes outer ring, inner ring and the plurality of bars between the outer ring and the inner ring, each of the cage is connected to the outer ring and the inner ring, and from the outer ring to the inner ring along the first direction extends;Wherein, the first direction is the same as the direction of rotation of the rotor supported by the rotor support system in working condition.This elastic support has the characteristics of compact structure and strong torsional rupture capacity.

Description

Technical Field

[0001] This invention relates to the field of aero-engines, and more particularly to an elastic support member and a rotor support system. Background Technology

[0002] In modern high-speed rotating machinery, such as aircraft engines, gas turbines, and turbochargers, rotors often operate at first-order critical speeds, or even above multiple critical speeds. When the rotor approaches or accelerates past these critical speeds, the rotor system experiences significant vibrations. Therefore, existing technologies often incorporate elastic damping supports into the rotor system. By altering the support stiffness, the critical speed of the system can be adjusted, and by increasing the damping of the support structure, rotor vibrations are effectively suppressed, thereby ensuring the safe and reliable operation of the system. Currently, the most widely used elastic support structures are elastic ring-type elastic support structures and squirrel-cage-type elastic support structures.

[0003] The existing elastic ring type elastic support structure is shown in the attached figure. Figure 1 As shown, the inner and outer surfaces of the structure have circumferentially distributed inner bosses 912 and outer bosses 913, respectively, with their positions staggered. The stiffness is adjusted by the number, position, and height of the bosses. While the elastic ring-type elastic support structure occupies less space and is compact, the staggered distribution of bosses on its inner and outer surfaces leads to poor manufacturability. Furthermore, wear occurs between the inner and outer bosses and their mating components during operation, resulting in poor reliability. Additionally, the linearity of its stiffness is poor.

[0004] The existing squirrel cage type elastic support structure is shown in the attached figure. Figure 2 As shown, its inner cylindrical surface is the bearing mating surface 923, which mates with the outer ring of the bearing, and its outer cylindrical surface is the extrusion oil film damper mating surface 925, which mates with the extrusion oil film bushing. The expansion ring grooves on both sides are used to install expansion rings to seal the lubricating oil. It is fixed to the stator through the bolt holes 921 on the mounting end face 922. Its stiffness is adjusted by controlling the size and number of cage bars 924. The squirrel cage elastic support structure has good linearity of stiffness, but it occupies a large axial space (and a large radial space if it is a folded-back structure), and has poor torsional resistance, requiring a separate anti-torsional breakage structure. Furthermore, it is prone to fatigue during operation and has low fatigue strength.

[0005] There is an urgent need to provide a compact and highly resistant elastic support to address the problems of existing elastic support structures. Summary of the Invention

[0006] The purpose of this invention is to provide an elastic support member that has a compact structure and strong resistance to torsional fracture.

[0007] To achieve the foregoing object, the elastic support for a rotor support system 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 connecting the outer ring and the inner ring and extending from the outer ring to the inner ring 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 condition.

[0009] In one or more embodiments, the cage bar is connected to the outer ring at a first end and connected to the inner ring at a second end, and the cage bar comprises a body portion, a first fillet portion at the first end, and a second fillet portion at the second end.

[0010] The body portion extends along the first direction, and the center of the circle where the first direction is located coincides with the center of the circle where the elastic support is located.

[0011] In one or more embodiments, the cage bar has a blade wheel structure, the body portion 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, the body portion has an outer surface and an inner surface, and the outer surface and the inner surface are circular arc surfaces respectively.

[0013] The center of the circle where the outer surface extends is located, the center of the circle where the inner surface extends is located, and the center of the circle where the elastic support is located coincide.

[0014] In one or more embodiments, at least one of the first fillet portions is provided with a mounting hole.

[0015] In one or more embodiments, the number of mounting holes is multiple, and the mounting holes are uniformly distributed along the circumferential direction of the elastic support.

[0016] In one or more embodiments, the inner ring has at least one protrusion, and the protrusion is arranged to protrude from the inner periphery of the inner ring towards the inner side of the inner ring along the radial direction of the inner ring.

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

[0018] In one or more embodiments, a plurality of cage bars are uniformly distributed along the circumferential direction of the elastic support.

[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] In another aspect, according to some embodiments of the present application, a rotor support system is also provided, which comprises a bearing seat and a bearing connected with the bearing seat through the elastic support as described above.

[0021] The present application has the following beneficial effects:

[0022] The present elastic support has the following beneficial effects:

[0023] The above description is only a summary of the technical solutions of the present application. In order to make the technical solutions of the present application more clearly understood and implemented, and to make the above and other purposes, features and advantages of the present application more apparent and easy to understand, the following detailed description of the specific embodiments of the present application is provided. BRIEF DESCRIPTION OF DRAWINGS

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not to be considered as limiting of the present application. Moreover, in the drawings, like reference numerals denote same or similar components. In the drawings:

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

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

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

[0028] Figure 4 A front view schematic diagram of some embodiments of the present elastic support is shown;

[0029] Figure 5 A perspective view schematic diagram of some embodiments of the present elastic support is shown;

[0030] Figure 6 and Figure 7 A half-section schematic diagram of some embodiments of the present elastic support in an assembled state is shown;

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

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

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0034] In order to solve the problem that the elastic support component in the existing rotor support system is easy to be damaged, on the one hand, according to some embodiments of the present application, a rotor support system is provided, Figure 3 A semi-schematic view according to some embodiments of the present rotor support system is shown, wherein the rotor support system comprises a bearing seat 81 and a bearing 82, and the bearing is connected with the bearing seat through an elastic support 100. In order to facilitate a more in-depth understanding of the structure of the rotor support system, further, in some specific embodiments, the bearing seat 81 is fixed on the casing through mounting edge bolts 83, and a squeeze oil film damper is arranged between the bearing 82 and the bearing seat 81. The elastic support 100 can adjust the fulcrum stiffness of the fulcrum and the critical speed of the rotor system, and the squeeze oil 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 the critical speed, so that the rotor can work safely and stably, and at the same time, the load of the fulcrum can be effectively transmitted.

[0035] In a specific embodiment, the oil supply structure of the bearing 82 is ring-lubrication, which comprises a bearing inner ring 821, a bearing outer ring 825 and rolling bodies 826. Uniformly distributed oil supply grooves 822 are arranged on the bearing inner ring 821 in the circumferential direction, and the lubricating oil flows in the oil supply grooves 822 in the axial direction. Radial oil supply holes are arranged on the oil supply grooves 822, so that under the action of centrifugal force, the lubricating oil is supplied to the rolling bodies along the radial oil supply holes. The oil supply mode of the squeeze oil film damper is that radial oil supply holes are arranged on the bearing seat 81, and the lubricating oil is supplied to the squeeze oil film damper in the radial direction. Sealing rings 823 are arranged at both ends of the squeeze oil film damper, which realize the sealing of the lubricating oil in the squeeze oil film damper and at the same time flow out with a certain leakage rate, so as to ensure the circulation of the lubricating oil. Vent holes 824 are arranged on the bearing seat, which ensure the flow of oil and gas on both sides of the bearing 824, and are beneficial to the ventilation and oil return performance of the whole bearing cavity.

[0036] In another aspect, according to some embodiments of the present application, there is also provided an elastic support, for example, for use in the rotor support system as described in the foregoing embodiments, Figure 4 A front view of some embodiments of the elastic support is shown, Figure 5 A perspective view of some embodiments of the elastic support is shown. Figure 6 And Figure 7 A half-section view of the elastic support in an assembled state is shown, Figures 8 to 10 A partial enlarged view of the elastic support is shown.

[0037] The elastic support 100 comprises an outer ring 1, an inner ring 2, and a plurality of cage bars 3 arranged between the outer ring 1 and the inner ring 2. Each cage bar 3 connects the outer ring 1 and the inner ring 2 and extends from the outer ring 1 to the inner ring 2 in 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 condition. For example Figure 4 And Figure 5 As shown, if the rotation direction x of the rotor supported by the rotor support system in the working condition is counterclockwise, then the first direction a is also counterclockwise. That is, for each cage bar 3, the connection with the outer ring 1 is located upstream of the connection with the inner ring 2 in the counterclockwise direction.

[0038] During engine operation, the bearing will generate a friction force in the rotation direction of the engine rotor, and this friction force will exert a torque on the elastic support 100 in the rotation direction of the engine. If the bearing is stuck abnormally, the torque will be even greater. Therefore, as shown in the working condition Figures 4 to 5 , the inner ring 2 of the elastic support 100 has a tendency to rotate counterclockwise relative to the outer ring 1, and at this time the cage bar 3 has a tendency to be stretched. Since the extension direction of the cage bar 3 is arranged to be the same as the rotation direction x of the rotor in the working condition, the torsional resistance of the entire elastic support 100 is greatly improved, and there is no need to additionally provide a special anti-torsion structure for the elastic support 100, and the fatigue resistance of the cage bar 3 is high. If the extension direction of the cage bar 3 is arranged to be opposite to the rotation direction x of the rotor in the working condition, the cage bar 3 will be compressed, which may cause buckling and instability.

[0039] By arranging the cage bar 3 with the extension direction arranged to be the same as the rotation direction x of the rotor in the working condition, the elastic support 100 has the characteristics of compact structure and strong anti-torsion capability. Compared with the traditional elastic support structure, the elastic support 100 occupies less space in the engine, has a compact structure, high reliability, is conducive to lightweight design, and is conducive to weight reduction.

[0040] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in one embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all referring to a common embodiment, or an embodiment that is independent of other embodiments. One of ordinary skill in the art will readily recognize from the disclosure herein, that embodiments of the present application can be combined with embodiments of the other applications.

[0041] In some embodiments of the present elastic support, the cage strip 3 is connected with the outer ring 1 at the first end, and connected with the inner ring 2 at the second end, and the cage strip 3 comprises a body part 30, a first fillet part 31 at the first end, and a second fillet part 32 at the second end. The body part 30 extends along the first direction a, and the center of the circle along which the first direction a extends coincides with the center of the circle along which the circumference of the elastic support 100 extends. By providing the fillet structure at the root of the cage strip 3, the stress on the root of the cage strip 3 can be reduced, and the entire elastic support 100 is easy to process, which can be realized by milling processing, and the processing process is good.

[0042] In the description of the embodiments of the present application, the technical terms“first” and“second”, such as“first fillet part” and“second fillet part”, are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0043] In some embodiments of the present elastic support, the cage strip 3 has a blade wheel structure, the body part 30 is a blade body, and the first fillet part 31 and the second fillet part 32 are blade roots.

[0044] In some embodiments of the present elastic support, along the radial direction of the elastic support 100, the body part 30 has an outer surface 301 and an inner surface 302, and the outer surface 301 and the inner surface 302 are respectively circular arc surfaces. The center of the circle along which the extension direction of the outer surface 301 extends, the center of the circle along which the extension direction of the inner surface 302 extends, and the center of the circle along which the elastic support 100 extends coincide. This setting can greatly enhance the tensile performance of the cage strip 3, facilitate the adjustment of the stiffness, and be beneficial to the processing characteristics of the entire elastic support 100.

[0045] In some embodiments of the elastic support, at least one first rounded corner 31 is provided with a mounting hole 310. In some embodiments of the elastic support, the number of mounting holes 310 is multiple, and the mounting holes are uniformly distributed along the circumference of the elastic support 100. By providing mounting holes 310 on the elastic support 100, which are uniformly arranged circumferentially, the elastic support 100 can be fixed to the bearing seat 81 by using bolts 7 or other fasteners provided in the mounting holes 310, and the mounting holes 310 are integrated with the root of the cage bar 3, so that the elastic support 100 does not need to be separately provided with a mounting edge, making the axial structure compact, facilitating installation, and increasing the strength of the cage bar root at the location.

[0046] In some embodiments of the elastic support, the inner ring 2 has at least one protrusion 20 that protrudes radially from the inner periphery of the inner ring 2 towards the inside of the inner ring 2.

[0047] In some embodiments of the elastic support, the protrusions 20 are arranged in pairs, and a pair of protrusions 20 forms an anti-rotation groove 21. 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, a plurality of cage bars 3 are uniformly distributed along the circumference of the elastic support 100. The plurality of cage bars 3 are uniformly distributed in the circumferential direction, so that the elastic support 100 has uniform stiffness in the circumferential direction, the structure is reliable, and it is beneficial for 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 surface structure that cooperates with the inner wall surface of the mounting groove on the bearing seat 81. The inner surface of the inner ring 2 is a cylindrical surface structure that cooperates with the bearing outer ring 825.

[0050] In the description of the embodiments of the present application, the technical terms "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the connection assembly in the connected state, and are only used for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0051] In the description of the embodiments of the present application, unless specifically defined and limited otherwise, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense, for example, can be fixedly connected, can also be detachably connected, or integrated; can be mechanically connected, can also be electrically connected; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning 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, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; 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 be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An elastic support member for use in a rotor support system, characterized in that, It includes an outer ring component, an inner ring component, and multiple cage bars disposed between the outer ring component and the inner ring component. Each cage bar connects the outer ring component and the inner ring component and extends from the outer ring component to the inner ring component along a first direction. The first direction is the same as the rotation direction of the rotor supported by the rotor support system under operating conditions.

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

3. The elastic support member as described in claim 2, characterized in that, The cage bars have an impeller structure, the main body is the blade, and the first rounded corner and the second rounded corner are the blade roots.

4. The elastic support member as described in claim 2, characterized in that, Along the radial direction of the elastic support member, the body portion has an outer surface and an inner surface, the outer surface and the inner surface being arc surfaces respectively; The center of the circle in the direction of the outer surface extension, the center of the circle in the direction of the inner surface extension, and the center of the circle in which the elastic support is located coincide.

5. The elastic support member as described in claim 2, characterized in that, At least one of the first rounded corner portions is provided with a mounting hole.

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

7. The elastic support member as described in claim 1, characterized in that, The inner ring member has at least one protrusion that protrudes radially from the inner periphery of the inner ring member toward the inner side of the inner ring member.

8. The elastic support member as described in claim 7, characterized in that, The protrusions are arranged in pairs, and an anti-rotation groove is formed between the pair of protrusions.

9. The elastic support member as described in claim 1, characterized in that, The cage bars are evenly distributed along the circumference of the elastic support.

10. The elastic support member as described in 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 includes a bearing housing and a bearing, wherein the bearing is connected to the bearing housing by an elastic support as described in any one of claims 1 to 10.

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