An end face oil supply structure for a cross rotor shaft bearing

Abstract

The application belongs to the field of aero-engines, and particularly relates to an end face oil supply structure suitable for an inter-shaft bearing of a counter-rotating rotor. When a double-rotor test piece is working, lubricating oil is sprayed out from a fixed oil supply nozzle fixed on a stator casing through a specific pipeline, rotates around a rotation axis under the rotation of an outer rotor assembly, and is gathered in an annular oil collecting cavity formed by an oil collecting ring and a rear outer rotor shaft section of an outer rotor shaft under the action of centrifugal force. The lubricating oil is sprayed onto the inter-shaft bearing through a plurality of rotating oil supply nozzles under the action of liquid level pressure difference, so as to realize lubrication of the inter-shaft bearing. The lubricating oil in a bearing cavity where the inter-shaft bearing is located flows out from a plurality of rotating oil return holes on a middle shoulder part of the outer rotor shaft through gaps between adjacent two oil supply nozzle mounting parts and gaps between adjacent two rotating oil supply nozzles under the action of centrifugal force and liquid level pressure difference, and is then recycled through a specific pipeline, so that complete oil supply flow paths and oil return flow paths are formed.

Description

Technical Field

[0001] This application belongs to the field of aero-engines, and specifically relates to an end-face oil supply structure suitable for inter-shaft bearings of counter-rotating rotors. Background Technology

[0002] Twin-rotor structures are widely used in aero-engines. To ensure the operational reliability of the twin-rotor system, an inter-shaft bearing is required between the two rotors. Unlike ordinary bearings, the inner and outer rings of an inter-shaft bearing rotate in the same or opposite directions during operation. In ordinary bearings, the outer ring is mounted on the stator casing, while the inner ring rotates with the rotor. Lubricating oil can be directly sprayed onto the bearing through an oil supply nozzle fixed to the casing, or sprayed onto the inner ring and supplied to the bearing by centrifugal force.

[0003] Existing oil supply structures are mostly suitable for general bearings with fixed outer rings. For inter-shaft bearings enclosed inside the rotor, the fixed nozzle cannot spray oil onto the bearing.

[0004] Therefore, it is desirable to have a technical solution to overcome or at least mitigate one of the aforementioned defects of the prior art. Summary of the Invention

[0005] The purpose of this application is to provide an end-face oil supply structure suitable for inter-shaft bearings of counter-rotating rotors, in order to solve at least one problem existing in the prior art.

[0006] The technical solution of this application is:

[0007] An end-face oil supply structure suitable for inter-shaft bearings of counter-rotating rotors, comprising:

[0008] An inner rotor assembly, the inner rotor assembly comprising an inner rotor shaft, a sealing ring, and an inner rotor clamping nut;

[0009] The front end of the inner rotor shaft is connected to the impeller, and the rear end is connected to the power unit.

[0010] The sealing ring is mounted on the inner rotor shaft;

[0011] The inner rotor clamping nut is installed on the inner rotor shaft, and a bearing inner ring mounting position is provided between the inner rotor clamping nut and the sealing ring;

[0012] An outer rotor assembly, comprising an outer rotor shaft, an outer rotor clamping nut, a rotary oil supply nozzle bracket, a rotary oil supply nozzle, and an oil collection ring;

[0013] The outer rotor shaft is sleeved on the inner rotor shaft. The outer rotor shaft includes a front outer rotor shaft section, an intermediate shoulder, and a rear outer rotor shaft section connected in sequence. The front end of the front outer rotor shaft section is connected to the impeller, and the rear end of the rear outer rotor shaft section is connected to the power unit. A rotary oil return hole is provided on the radially outer side of the intermediate shoulder, and an oil supply hole is provided on the radially inner side.

[0014] The outer rotor clamping nut is installed on the front outer rotor shaft section and cooperates with the sealing ring for sealing;

[0015] The rotary oil supply nozzle bracket is mounted on the front outer rotor shaft section, and the rotary oil supply nozzle bracket is provided with a bearing outer ring mounting position;

[0016] The front end of the rotary oil supply nozzle is connected to the rotary oil supply nozzle bracket, and the rear end is inserted into the oil supply hole;

[0017] The oil collecting ring is mounted on the intermediate shoulder by oil collecting ring mounting bolts, and an annular oil collection cavity is formed between the oil collecting ring and the rear outer rotor shaft section;

[0018] An inter-shaft bearing, wherein the inner ring of the inter-shaft bearing is installed at the bearing inner ring mounting position, and the outer ring of the inter-shaft bearing is installed at the bearing outer ring mounting position;

[0019] A fixed oil supply nozzle is installed on the stator casing and is located on the rear side of the annular oil receiving chamber.

[0020] In at least one embodiment of this application, the front end of the inner rotor shaft is provided with an inner rotor mounting edge for connection with the impeller, and the rear end of the inner rotor shaft is provided with an inner rotor spline for connection with the power unit.

[0021] In at least one embodiment of this application, the inner rotor shaft is provided with sealing teeth, which cooperate with the rear outer rotor shaft section for sealing.

[0022] In at least one embodiment of this application, the front end of the front outer rotor shaft section is provided with an outer rotor mounting edge for connection with the impeller, and the rear end of the rear outer rotor shaft section is provided with an outer rotor spline for connection with the power unit.

[0023] In at least one embodiment of this application, an oil-blocking boss is provided on the rear outer rotor shaft section, and a spiral groove is provided on the oil-blocking boss, the spiral groove cooperating with the inner rotor shaft for sealing.

[0024] In at least one embodiment of this application, a plurality of rotating oil return holes are uniformly opened in the circumferential direction.

[0025] In at least one embodiment of this application, the rotary oil supply nozzle bracket is a ring structure, and a plurality of oil supply nozzle mounting parts are evenly arranged circumferentially at the rear end of the rotary oil supply nozzle bracket. Each oil supply nozzle mounting part is provided with an oil supply nozzle mounting hole, and a notch for oil return is provided between two adjacent oil supply nozzle mounting parts.

[0026] In at least one embodiment of this application, a plurality of the rotary oil nozzles are evenly arranged circumferentially.

[0027] The invention has at least the following beneficial technical effects:

[0028] The end-face oil supply structure applicable to the inter-shaft bearing of the dual-rotor compressor test piece in this application can achieve lubrication and sealing of the inter-shaft bearing through the oil supply structure and the oil return structure. The structure is simple, ingeniously designed, and highly practical. It can achieve end-face oil supply and can use centrifugal force and liquid level pressure difference to achieve lubricating oil flow, thus solving the technical problems of oil supply and return for the inter-shaft bearing of the dual-rotor compressor test piece. Attached Figure Description

[0029] Figure 1 This is a cross-sectional view of an end-face oil supply structure applicable to an inter-shaft bearing of a counter-rotating rotor according to one embodiment of this application;

[0030] Figure 2 This is a cross-sectional view of an inner rotor assembly according to one embodiment of this application;

[0031] Figure 3 This is a cross-sectional view of an outer rotor assembly according to one embodiment of this application.

[0032] in:

[0033] 1-Inner rotor assembly; 11-Inner rotor shaft; 111-Inner rotor mounting edge; 112-Sealing tooth; 113-Inner rotor spline; 12-Sealing ring; 13-Inner rotor clamping nut; 2-Outer rotor assembly; 21-Outer rotor shaft; 211-Outer rotor mounting edge; 212-Oil baffle boss; 213-Outer rotor spline; 214-Rotary oil return hole; 22-Outer rotor clamping nut; 23-Rotary oil supply nozzle bracket; 24-Rotary oil supply nozzle; 25-Oil collection ring; 26-Oil collection ring mounting bolt; 3-Inter-shaft bearing; 4-Fixed oil supply nozzle. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0035] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this application.

[0036] The following is in conjunction with the appendix Figures 1 to 3 This application will be described in further detail.

[0037] This application provides an end-face oil supply structure suitable for bearings between counter-rotating rotor shafts, such as... Figure 1 As shown, it includes: inner rotor assembly 1, outer rotor assembly 2, inter-shaft bearing 3, and fixed oil supply nozzle 4.

[0038] like Figure 2 As shown, the inner rotor assembly 1 includes an inner rotor shaft 11, a sealing ring 12, and an inner rotor clamping nut 13. The inner rotor shaft 11 tapers from its front to its rear end. The front end of the inner rotor shaft 11 has an inner rotor mounting edge 111 with a through hole for connection to the impeller. The rear end of the inner rotor shaft 11 has an inner rotor spline 113 for transmitting torque, and the rear end of the inner rotor shaft 11 is connected to the power unit via the inner rotor spline 113. The sealing ring 12 is mounted on the inner rotor shaft 11, near the middle of the inner rotor shaft 11. The inner rotor clamping nut 13 is mounted on the inner rotor shaft 11, located behind the sealing ring 12, and a bearing inner ring mounting position is provided between the inner rotor clamping nut 13 and the sealing ring 12.

[0039] like Figure 3As shown, the outer rotor assembly 2 includes an outer rotor shaft 21, an outer rotor clamping nut 22, a rotary oil supply nozzle bracket 23, a rotary oil supply nozzle 24, and an oil collection ring 25. The outer rotor shaft 21 is sleeved on the inner rotor shaft 11. The outer rotor shaft 21 includes a front outer rotor shaft section, a middle shoulder, and a rear outer rotor shaft section connected in sequence. The outer rotor shaft 21 is adapted to the inner rotor shaft 11. The radial dimension of the front outer rotor shaft section is larger than that of the rear outer rotor shaft section. The front end of the front outer rotor shaft section has an outer rotor mounting edge 211 with a through hole for connecting to the impeller. The rear end of the rear outer rotor shaft section has an outer rotor spline 213 for transmitting torque, and the rear end of the rear outer rotor shaft section is connected to the power unit via the outer rotor spline 213. The radially outer side of the middle shoulder has a rotary oil return hole 214 for recovering lubricating oil from the inter-shaft bearing 3 cavity, and the radially inner side has an oil supply hole for installing the rotary oil supply nozzle 24. The outer rotor clamping nut 22 is installed on the front outer rotor shaft section and cooperates with the sealing ring 12 for sealing. The rotary oil supply nozzle bracket 23 is installed on the front outer rotor shaft section, and the rotary oil supply nozzle bracket 23 is provided with a bearing outer ring mounting position. The front end of the rotary oil supply nozzle 24 is connected to the rotary oil supply nozzle bracket 23, and the rear end is inserted into the oil supply hole. The oil collecting ring 25 is installed on the intermediate shoulder through the oil collecting ring mounting bolt 26, and the oil collecting ring 25 and the rear outer rotor shaft section form an annular oil collection chamber.

[0040] Furthermore, the inter-shaft bearing 3 is disposed between the inner rotor assembly 1 and the outer rotor assembly 2, and serves as a support. The inner ring of the inter-shaft bearing 3 is installed at the bearing inner ring mounting position, and the outer ring of the inter-shaft bearing 3 is installed at the bearing outer ring mounting position. The fixed oil supply nozzle 4 is installed on the stator casing and is located on the rear side of the annular oil receiving chamber.

[0041] In a preferred embodiment of this application, the inner rotor shaft 11 is provided with sealing teeth 112, which cooperate with the rear outer rotor shaft section for sealing. Advantageously, in this embodiment, the rear outer rotor shaft section is provided with an oil-blocking boss 212, which is provided with a spiral groove, and the spiral groove cooperates with the inner rotor shaft 11 for sealing.

[0042] In a preferred embodiment of this application, multiple rotary oil return holes 214 are evenly distributed circumferentially. The rotary oil supply nozzle support 23 is a ring structure, and multiple oil supply nozzle mounting portions are evenly distributed circumferentially at the rear end of the rotary oil supply nozzle support 23. Each oil supply nozzle mounting portion has an oil supply nozzle mounting hole, and a notch for oil return is provided between two adjacent oil supply nozzle mounting portions. The oil supply holes on the middle shoulder of the outer rotor shaft 21 correspond one-to-one with the oil supply nozzle mounting portions, and multiple rotary oil supply nozzles 24 are evenly distributed circumferentially.

[0043] The end-face oil supply structure applicable to the bearing between the shafts of counter-rotating rotors in this application operates on the following principle:

[0044] When the dual-rotor test piece is working, an external power device (such as a motor) provides power to the inner rotor assembly 1 and the outer rotor assembly 2 through the inner rotor spline 113 and the outer rotor spline 213 respectively, so that the inner rotor assembly 1 and the outer rotor assembly 2 rotate in the same or opposite directions around the rotation axis respectively, and their speeds can be the same or different.

[0045] Lubricating oil is sprayed from a fixed oil supply nozzle 4 fixed on the stator casing via a specific pipeline. Driven by the rotation of the outer rotor assembly 2, the lubricating oil rotates around the axis of rotation. Under centrifugal force, the lubricating oil collects in the annular oil collection chamber formed by the oil collecting ring 25 and the rear outer rotor shaft section of the outer rotor shaft 21. Under the action of liquid level pressure difference, the lubricating oil is sprayed onto the inter-shaft bearing 3 through multiple rotating oil supply nozzles 24, thereby achieving lubrication of the inter-shaft bearing 3. Under the action of centrifugal force and liquid level pressure difference, the lubricating oil in the bearing cavity where the inter-shaft bearing 3 is located flows out through multiple rotating oil return holes 214 on the middle shoulder of the outer rotor shaft 21 after passing through the gap between adjacent oil supply nozzle mounting parts and the gap between adjacent rotating oil supply nozzles 24, and is then recovered through a specific pipeline, forming a complete oil supply and return flow path.

[0046] The end-face oil supply structure of this application is applicable to the inter-shaft bearing of a counter-rotating rotor. When the dual-rotor test piece is working, there is always lubricating oil in the bearing cavity where the inter-shaft bearing 3 is located. In order to avoid lubricating oil leakage, the sealing ring 12 and the outer rotor clamping nut 22 cooperate to form a high-pressure gas throttling unit, thereby achieving the front sealing of the bearing cavity of the inter-shaft bearing 3. When the sealing teeth 112 on the inner rotor shaft 11 rotates, the lubricating oil is thrown into the bearing cavity of the inter-shaft bearing 3. The oil-blocking boss 212 and the inner rotor shaft 11 cooperate to form a high-pressure gas throttling unit, which together achieves the rear sealing of the bearing cavity of the inter-shaft bearing 3.

[0047] This application presents an end-face oil supply structure for the inter-shaft bearing of a counter-rotating rotor. Through the oil supply and return structures, it achieves lubrication and sealing of the inter-shaft bearing 3 of a compressor dual-rotor test piece. The structure is simple, ingeniously designed, and highly practical. This application enables end-face oil supply and utilizes centrifugal force and liquid level pressure difference to achieve lubricating oil flow, solving the technical challenges of oil supply and return for the inter-shaft bearing 3 of a compressor dual-rotor test piece.

[0048] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An end-face oil supply structure suitable for bearings between opposing rotor shafts, characterized in that, The utility model relates to a kind of inner rotor and outer rotor combination assembly, including: Inner rotor assembly (1), the inner rotor assembly (1) includes inner rotor shaft (11), sealing ring (12) and inner rotor compression nut (13); Wherein, the front end of the inner rotor shaft (11) is connected with the blade disc, and the rear end is connected with the power device; The sealing ring (12) is installed on the inner rotor shaft (11); The inner rotor compression nut (13) is installed on the inner rotor shaft (11), and the bearing inner ring installation position is provided between the inner rotor compression nut (13) and the sealing ring (12); Outer rotor assembly (2), the outer rotor assembly (2) includes outer rotor shaft (21), outer rotor compression nut (22), rotating oil supply nozzle support (23), rotating oil supply nozzle (24) and oil collecting ring (25); Wherein, the outer rotor shaft (21) is sleeved on the inner rotor shaft (11), and the outer rotor shaft (21) includes front outer rotor shaft section, middle shoulder portion and rear outer rotor shaft section connected in sequence, the front end of the front outer rotor shaft section is connected with the blade disc, the rear end of the rear outer rotor shaft section is connected with the power device, and the radial outer side of the middle shoulder portion is provided with rotating oil return hole (214), and the radial inner side is provided with oil supply hole; The outer rotor compression nut (22) is installed on the front outer rotor shaft section, and is sealed with the sealing ring (12); The rotating oil supply nozzle support (23) is installed on the front outer rotor shaft section, and the rotating oil supply nozzle support (23) is provided with bearing outer ring installation position; The front end of the rotating oil supply nozzle (24) is connected with the rotating oil supply nozzle support (23), and the rear end is inserted into the oil supply hole; The oil collecting ring (25) is installed on the middle shoulder portion by oil collecting ring mounting bolt (26), and the annular oil collecting cavity is formed between the oil collecting ring (25) and the rear outer rotor shaft section; Inter-shaft bearing (3), the inner ring of the inter-shaft bearing (3) is installed in the bearing inner ring installation position, and the outer ring of the inter-shaft bearing (3) is installed in the bearing outer ring installation position; Fixed oil supply nozzle (4) is installed on the static rotor casing, and the fixed oil supply nozzle (4) is located at the rear side of the annular oil collecting cavity.

2. The oil supply structure for the end surface of the inter-shaft bearing of the contra-rotating rotor according to claim 1, characterized by The front end of the inner rotor shaft (11) is provided with inner rotor mounting edge (111) for connecting with the blade disc, and the rear end of the inner rotor shaft (11) is provided with inner rotor spline (113) for connecting with the power device.

3. The oil supply structure for the end surface of the inter-shaft bearing of the counter-rotating rotor according to claim 2, characterized by The inner rotor shaft (11) is provided with sealing tooth (112), and the sealing tooth (112) is sealed with the rear outer rotor shaft section.

4. The oil supply structure for the end surface of the inter-shaft bearing of the counter-rotating rotor according to claim 1, characterized by, The front end of the front outer rotor shaft section is provided with outer rotor mounting edge (211) for connecting with the blade disc, and the rear end of the rear outer rotor shaft section is provided with outer rotor spline (213) for connecting with the power device.

5. The oil supply structure for the end surface of the inter-shaft bearing of the counter-rotating rotor according to claim 1, characterized by, The rear outer rotor shaft section is provided with oil blocking boss (212), the oil blocking boss (212) is provided with helical groove, and the helical groove is sealed with the inner rotor shaft (11).

6. The oil supply structure for the end surface of the inter-shaft bearing of the counter-rotating rotor according to claim 1, characterized by The rotating oil return hole (214) is evenly provided with a plurality of circumferential directions.

7. The oil supply structure for the end surface of the inter-shaft bearing of the counter-rotating rotor according to claim 1, characterized by, The rotating oil supply nozzle support (23) is a whole ring structure, and a plurality of oil supply nozzle mounting portions are uniformly arranged on the rear end of the rotating oil supply nozzle support (23) in the circumferential direction, and an oil supply nozzle mounting hole is arranged on each oil supply nozzle mounting portion, and a gap for oil return is arranged between two adjacent oil supply nozzle mounting portions.

8. The oil supply structure for the end surface of the inter-shaft bearing of the counter-rotating rotor according to claim 7, characterized by, The rotating oil supply nozzle (24) is arranged in the circumferential direction.

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