An elastic support structure

Abstract

The present invention provides an elastic support structure, which relates to the technical field of aeroengines. The elastic support structure includes a rectifier, a squirrel-cage elastic support, a bearing and a sealing ring. The rectifier includes a housing, an inner support ring and blades. Oil mist channels are formed in the blades, and a communication channel is formed in the inner support ring. The squirrel-cage elastic support is a stepped cylindrical structure and is inserted into the support inner ring. A damping ring is sleeved and fixed on the outer side of the squirrel-cage elastic support, and the damping ring and the inner support ring cooperate to form a damping seal. A sealing cavity, an oil mist collection cavity and a bearing fixing cavity are formed on the inner side of the squirrel-cage elastic support, and an oil mist emission hole communicating the oil mist collection cavity with the communication channel is formed in the squirrel-cage elastic support, so that oil mist can enter the oil mist collection cavity through the oil mist channel, the communication channel and the oil mist emission hole and flow and diffuse towards the bearing side, playing a role in cooling and lubricating the bearing. It has the advantages of high integration, integration of multiple structural functions, simple layout and low manufacturing cost.

Description

Technical Field

[0001] The present invention relates to the technical field of aero-engines, and particularly to an elastic support structure. Background Art

[0002] In order to meet the need of avoiding the critical speed of a flexible rotor from the operating speed, elastic supports are often used to adjust the critical speed. Due to the accuracy of its stiffness control and high reliability, the squirrel-cage elastic support is widely used in design. At present, the squirrel-cage elastic support usually only has the functions of stiffness control and supporting the bearing, so special components with functions such as perfect bearing lubrication oil supply and return, bearing chamber sealing, and squeeze film damper vibration reduction are required to ensure the stable and safe operation of the supported rotor at high speeds.

[0003] The vibration reduction of the elastic support generally adopts a squeeze film damper structure, so corresponding oil film holes and oil film grooves need to be machined on the supporting seat of the supporting elastic support: if there is no oil film pressure-holding sealing structure, the lubricating oil consumption will increase significantly and the burden on the oil return system will increase; with an oil film pressure-holding sealing structure, the complexity of the structure itself and the assembly will increase significantly. Moreover, the bearings installed on the elastic support generally need to be lubricated by oil injection or under-ring lubrication, and an independent lubricating oil supply and injection structure needs to be designed to meet the bearing lubrication and cooling requirements. The structure design is relatively complex and the corresponding processing cost is relatively high; the oil inlet volume determines that this structure must have sufficient oil return space and a supporting oil return pump, which will also increase the structural complexity. Summary of the Invention

[0004] Therefore, in order to reduce the structural complexity of the elastic support on the premise of ensuring functions such as damping and vibration reduction, bearing lubrication and temperature reduction, and bearing chamber sealing, the present invention provides an elastic support structure.

[0005] The elastic support structure provided by the present invention adopts the following technical solutions:

[0006] An elastic support structure, comprising:

[0007] A rectifier, which includes a housing, an inner support ring arranged inside the housing, and blades connected between the housing and the inner support ring. An oil mist inlet for connecting an oil mist generator is provided on the housing. An oil mist channel is opened on the blade. A communication channel is opened on the inner support ring. The oil mist inlet is communicated to the inner side of the support inner ring through the oil mist channel and the communication channel;

[0008] A squirrel-cage elastic support, which is a cylindrical structure arranged in a stepped manner. The squirrel-cage elastic support is sleeved in the support inner ring; a sealing cavity, an oil mist collection cavity, and a bearing fixing cavity are formed inside the squirrel-cage elastic support in sequence along its axial direction, and an oil mist emission hole for communicating the oil mist collection cavity with the communication channel is opened on the squirrel-cage elastic support;

[0009] The bearing is embedded and fixed in the bearing fixing cavity, so that the oil mist collection cavity faces the gap between the inner and outer rings of the bearing;

[0010] The sealing ring is fitted in the sealing cavity to prevent the oil mist from diffusing into the sealing cavity;

[0011] The damping ring is sleeved and fixed on the outer wall of the squirrel cage elastic support and fits against the inner wall of the support ring to form a damping seal.

[0012] Optionally, a plurality of oil mist emission holes are provided and are distributed in a circular array on the squirrel cage elastic support; an annular diffusion cavity is formed on the inner wall of the inner support ring, the communication channel is communicated with the diffusion cavity, and the openings of the oil mist emission holes are located in the diffusion cavity.

[0013] Optionally, one end of the sealing ring extends to the inner side of the collection cavity and abuts against the inner ring of the bearing to seal the radial direction of the oil mist collection cavity.

[0014] Optionally, a labyrinth structure is provided on the outer wall of the sealing ring, and the labyrinth structure is fitted on the inner wall of the sealing cavity.

[0015] Optionally, an annular installation groove is formed on the outer wall of the squirrel cage elastic support, and the damping ring is fitted in the installation groove.

[0016] Optionally, a plurality of damping rings are provided at intervals along the axial direction of the squirrel cage elastic support.

[0017] Optionally, the inner diameter of the oil mist collection cavity is smaller than the inner diameter of the bearing fixing cavity, so that a limiting surface is formed between the bearing fixing cavity and the oil mist collection cavity, and the outer ring of the bearing abuts against the limiting surface.

[0018] Optionally, a clamping groove is formed on the inner wall of the squirrel cage elastic support, the clamping groove is located on the side of the bearing fixing cavity away from the oil mist collection cavity, and a retaining ring that abuts against the outer ring of the bearing is embedded in the clamping groove.

[0019] Optionally, a limiting step structure is provided on the inner support ring, a limiting ring adapted thereto is provided on the outside of the squirrel cage elastic support, and the limiting ring abuts against the limiting step structure.

[0020] Optionally, the cross-sectional shape of the oil mist channel is elliptical.

[0021] The technical solution of the present invention has the following advantages:

[0022] 1. The elastic support structure provided by the present invention allows the lubricating oil mist generated by the oil mist generator to enter the oil mist collection chamber through the oil mist channel, the communication channel, and the oil mist emission holes, and is restricted by the sealing ring, and can only diffuse and flow towards the bearing side, achieving the purpose of cold zone lubrication for the bearing. At the same time, the stepped squirrel cage spring support realizes the function of damping and shock absorption through the cooperation of the damping ring and the inner support ring, thus having the advantages of high integration, simple layout, and low manufacturing cost.

[0023] 2. In the elastic support structure provided by the present invention, the sealing ring is fitted in the sealing chamber through the labyrinth structure, enabling a small amount of sealing gas to enter the oil mist collection chamber through the gaps of the labyrinth structure to mix with the oil mist, and driving the oil mist to diffuse and flow towards the bearing side under the action of the pressure difference, improving the cooling and lubrication effect on the bearing.

[0024] 3. The elastic support structure provided by the present invention can adjust the structural damping distribution targeted by adjusting the diameter difference of each adjustment step and the cross-sectional size of the damping ring to achieve the best effect of structural vibration reduction.

[0025] 4. The elastic support structure provided by the present invention can set the appropriate number of oil mist emission holes according to the usage requirements, and at the same time adjust the size of the oil mist collection chamber to adapt to the lubrication and cooling requirements of different bearings and different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 is a schematic structural diagram of the elastic support structure provided by the present invention;

[0028] Figure 2 is a schematic structural diagram of the rectifier in the elastic support structure provided by the present invention;

[0029] Figure 3 is a schematic structural diagram of the squirrel cage spring support in the elastic support structure provided by the present invention;

[0030] Figure 4 is a schematic structural diagram of the flow direction of the oil mist and the sealing gas inside the elastic support structure.

[0031] Explanation of the accompanying drawings: 1. outer shell; 2. inner support ring; 3. blade; 4. oil mist channel; 5. oil mist inlet; 6. oil mist diffusion groove; 7. connecting channel; 8. limiting step structure; 9. squirrel cage spring support; 10. limiting ring; 11. mounting groove; 12. damping ring; 13. sealing chamber; 14. oil mist collecting chamber; 15. bearing fixing chamber; 16. oil mist emission hole; 17. limiting surface; 18. slot; 19. retaining ring; 20. sealing ring; 21. comb tooth structure. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] This embodiment provides a bearing elastic support structure, combined with Figure 1 - Figure 4 As shown, the bearing elastic support structure includes: a rectifier, a squirrel cage elastic support 9, a bearing and a sealing ring 20.

[0037] like Figure 1 and Figure 2As shown in the figure, the rectifier includes a housing 1, an inner support ring 2 disposed inside the housing 1, and a plurality of blades 3 connected between the housing 1 and the inner support ring 2. One of the blades 3 is set as a large blade 3, and an oil mist channel 4 is formed on the blade 3 of the rectifier. The shape of the oil mist channel 4 is not limited. In this embodiment, the cross-section of the oil mist channel 4 is an ellipse adapted to the shape of the blade 3, which can not only ensure a relatively large flow area of the oil mist channel 4 but also ensure the structural strength of the blade 3. One end of the inner support ring 2 extends axially to form a damping support structure, and a communication channel 7 is formed on the inner support ring 2, and the communication channel 7 is connected to the oil mist channel 4. An oil mist inlet 5 is provided on the housing 1, and the oil mist inlet 5 is used to connect to an oil mist generator, so that the oil mist in the oil mist generator can enter the communication channel 7 through the oil mist channel 4.

[0038] As Figure 3 shown, the squirrel-cage elastic support 9 is a stepped cylindrical structure. One end of the squirrel-cage elastic support 9 passes through the inner support ring 2. A limiting step structure 8 is provided at one end of the inner support ring 2. A corresponding outward convex limiting ring 10 is provided on the outer side of the squirrel-cage elastic support 9, and the limiting ring 10 abuts against the limiting step structure 8 to limit the installation position of the squirrel-cage elastic support 9.

[0039] An annular installation groove 11 is formed on the outer wall of the squirrel-cage elastic support 9, and a damping ring 12 is embedded in the installation groove 11. The outer wall of the damping ring 12 is attached to the inner wall of the inner support ring 2 to achieve the purpose of damping and shock absorption between the squirrel-cage elastic support 9 and the inner support ring 2. The number of the damping rings 12 is not limited. In this embodiment, two damping rings 12 are provided, and the two damping rings 12 are respectively arranged at the end of the squirrel-cage elastic support 9 and the limiting ring 10.

[0040] The inner side of the squirrel-cage elastic support 9 is also arranged in a stepped shape, so that a sealing cavity 13, an oil mist collection cavity 14, and a bearing fixing cavity 15 are sequentially formed inside the squirrel-cage elastic support 9 in the axial direction. The sealing cavity 13, the oil mist collection cavity 14, and the bearing fixing cavity 15 are all circular and the inner diameters gradually increase.

[0041] Combined with Figure 1 shown, the outer ring of the bearing is embedded and fixed in the bearing fixing cavity 15. A limiting surface 17 is formed between the bearing fixing cavity 15 and the oil mist collection cavity 14. The outer ring of the bearing abuts against the limiting surface 17 to limit the installation position of the bearing, so that the clearance between the inner and outer rings of the bearing is directly opposite to the oil mist collection cavity 14. An annular groove 18 is also formed in the squirrel-cage elastic support 9. The groove 18 is annular and is located on the side of the bearing fixing cavity 15 away from the oil mist collection cavity 14. The inner diameter of the groove 18 is larger than the inner diameter of the bearing fixing cavity 15. A retaining ring 19 is embedded in the groove 18, and the retaining ring 19 abuts against the other end face of the outer ring of the bearing, thereby restricting the bearing in the bearing fixing cavity 15.

[0042] As Figure 3As shown, oil mist emission holes 16 are also provided on the squirrel cage spring support 9 along its radial direction. The oil mist emission holes 16 connect the communication channel 7 and the oil mist collection chamber 14, enabling the oil mist to enter the oil mist collection chamber 14 through the oil mist emission holes 16. The number of the oil mist emission holes 16 is not limited and can be set according to the requirements of bearing lubrication and cooling. In this embodiment, a plurality of oil mist emission holes 16 are provided and are evenly arranged along the circumferential direction of the squirrel cage spring support 9. Moreover, an oil mist diffusion groove 6 is also provided on the inner wall of the inner support ring 2. The oil mist diffusion groove 6 is also annular. The communication channel 7 communicates with the oil mist diffusion groove 6. The opening of each oil mist emission hole 16 is located in the oil mist diffusion groove 6, enabling the oil mist to uniformly enter the oil mist collection chamber 14 from each oil mist emission hole 16 and improving the uniformity of the oil mist in the oil mist collection chamber 14.

[0043] As Figure 1 shown, one end of the sealing ring 20 is inserted into the sealing chamber 13. A labyrinth structure 21 is provided on the outer wall of the sealing ring 20. The labyrinth structure 21 cooperates with the inner wall of the sealing chamber 13 to form a seal. And the other end of the sealing ring 20 abuts against the inner ring end face of the bearing, closing the radial direction of the oil mist collection chamber 14, so that the oil mist can only flow and diffuse from the axial opening to the bearing side.

[0044] Combined with Figure 4 shown, the lubricating oil mist generated by the oil mist generator will pass through the oil mist channel 4 and the communication channel 7 in the rectifier and enter the oil mist diffusion groove 6, and then enter the oil mist collection chamber 14 evenly through each oil mist emission hole 16. At the same time, a small amount of sealing gas will also enter the oil mist collection chamber 14 through the gaps of the labyrinth structure 21 and mix with the oil mist. Under the action of the pressure difference, it drives the oil mist to diffuse and flow to the bearing side. After lubricating and cooling the bearing, it can pass through other parts that need to be cooled and then enter the atmosphere through the oil mist exhaust path or be collected by the ventilator for the oil mist.

[0045] For the elastic support structure provided in this embodiment, the integration degree of each component is relatively high. Only by the cooperation of the stepped squirrel cage spring support 9 and the equally stepped inner support ring 2, while realizing the stiffness adjustment function, it also realizes functions such as oil mist input, lubrication and cooling of the bearing, and damping and shock absorption. And by adjusting the diameter difference of each step and the cross-sectional size of the damping ring 12, the structural damping distribution can be adjusted targeted to achieve the best effect of structural vibration reduction. The number of the oil mist emission holes 16 can also be designed according to the use requirements, and at the same time, the size of the oil mist collection chamber 14 is adjusted to adapt to the lubrication and cooling requirements of different bearings and different working conditions.

[0046] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present invention.

Claims

1. An elastic support structure, characterized in that, it includes: A rectifier, which includes a housing (1), an inner support ring (2) arranged inside the housing (1), and blades (3) connected between the housing (1) and the inner support ring (2). An oil mist inlet (5) for connecting an oil mist generator is provided on the housing (1). An oil mist passage (4) is opened on the blade (3). A communication passage (7) is opened on the inner support ring (2). The oil mist inlet (5) communicates with the inside of the inner support ring (2) through the oil mist passage (4) and the communication passage (7); A squirrel cage elastic support (9), which is a cylindrical structure arranged in a stepped manner. The squirrel cage elastic support (9) is arranged in the inner support ring (2). A sealing cavity (13), an oil mist collection cavity (14), and a bearing fixing cavity (15) are formed inside the squirrel cage elastic support (9) in sequence along its axial direction. An oil mist emission hole (16) for communicating the oil mist collection cavity (14) with the communication passage (7) is opened on the squirrel cage elastic support (9); A bearing, which is embedded and fixed in the bearing fixing cavity (15) so that the oil mist collection cavity (14) faces the gap between the inner and outer rings of the bearing; A sealing ring (20), which is fitted in the sealing cavity (13) to prevent the oil mist from diffusing into the sealing cavity (13); A damping ring (12), which is sleeved and fixed on the outer wall of the squirrel cage elastic support (9) and fits against the inner wall of the support ring to form a damping seal; The inner diameter of the oil mist collection cavity (14) is smaller than the inner diameter of the bearing fixing cavity (15), so that a limiting surface (17) is formed between the bearing fixing cavity (15) and the oil mist collection cavity (14). The outer ring of the bearing abuts against the limiting surface (17); A clamping groove (18) is opened on the inner wall of the squirrel cage elastic support (9). The clamping groove (18) is located on the side of the bearing fixing cavity (15) away from the oil mist collection cavity (14). A retaining ring (19) that abuts against the outer ring of the bearing is embedded in the clamping groove (18); A limiting step structure (8) is provided on the inner support ring (2). A matching limiting ring (10) is arranged on the outer side of the squirrel cage elastic support (9). The limiting ring (10) abuts against the limiting step structure (8).

2. The elastic support structure according to claim 1, characterized in that, A plurality of the oil mist emission holes (16) are provided and are distributed in a circular array on the squirrel cage elastic support (9); An annular diffusion cavity is opened on the inner wall of the inner support ring (2). The communication passage (7) communicates with the diffusion cavity. The opening of the oil mist emission hole (16) is located in the diffusion cavity.

3. The elastic support structure according to claim 1, characterized in that, One end of the sealing ring (20) extends to the inside of the collection cavity and abuts against the inner ring of the bearing, closing the radial direction of the oil mist collection cavity (14).

4. The elastic support structure according to claim 3, characterized in that, The outer wall of the sealing ring (20) is provided with a labyrinth structure (21), and the labyrinth structure (21) is fitted on the inner wall of the sealing cavity (13).

5. The elastic support structure according to claim 1, wherein, an annular mounting groove (11) is formed in the outer wall of the squirrel-cage elastic support (9), and the damping ring (12) is fitted in the mounting groove (11).

6. The elastic support structure according to claim 5, wherein, a plurality of the damping rings (12) are arranged at intervals along the axial direction of the squirrel-cage elastic support (9).

7. The elastic support structure according to any one of claims 1-6, wherein, the cross-sectional shape of the oil mist passage (4) is oval.

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