Birotor experimental device

Abstract

The invention belongs to the technical field of aero-engines, and provides a double-rotor experimental device which is characterized in that a penetrating cavity is formed in a base, a first rolling bearing, a second rolling bearing and a third rolling bearing are arranged on the inner wall of the penetrating cavity, and one end of a rotating shaft of an outer rotor is rotationally connected with the third rolling bearing in a sleeving mode; one end of the inner rotor rotating shaft is rotationally sleeved with the first rolling bearing and the second rolling bearing, the other end of the inner rotor rotating shaft extends to the hollow inner cavity of the outer rotor rotating shaft, a driving assembly is installed on the side wall of the base, and the output end of the driving assembly extends into the penetrating cavity and is in transmission connection with the outer rotor rotating shaft. According to the double-rotor experiment device, the first rolling bearing, the second rolling bearing and the third rolling bearing are jointly arranged in the penetrating cavity of the base, the overall weight is reduced, the distance between the first rolling bearing and the second rolling bearing and the distance between the second rolling bearing and the third rolling bearing are shortened, the overall power-to-weight ratio is increased, and the experiment efficiency is improved. And the overall stability is directly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation engines, and in particular relates to a dual-rotor experimental device. Background Art

[0002] The dual-spool or twin-spool structure is one of the core designs of modern aircraft engines (such as turboshaft and turboprop engines). It significantly improves the performance, efficiency and reliability of the engine through the independent or coordinated rotation of the high-pressure spool (HP spool) and the low-pressure spool (LP spool). Correspondingly, the rotor vibration test bench is a key equipment for studying the dynamic characteristics, critical speed, vibration response and stability of dual rotors. In order to meet the connection between the high-pressure rotor and the low-pressure rotor and the external drive, the traditional dual-rotor experimental device usually uses multiple independent support seats to install rolling bearings respectively to support the high-pressure rotor, the low-pressure rotor and the intermediate bearing. However, each bearing needs to be equipped with an independent support seat (usually a cast aluminum or steel shell), which increases the overall weight of the experimental device. In addition, the independent support seat requires a separate oil circuit and sealing structure, which further increases the risk of lubricating oil leakage and weight, affecting the overall power-to-weight ratio. Under the technical requirements of lightweight, compactness and high efficiency, conventional dual-rotor experimental devices can no longer meet the needs.

[0003] In view of this, overcoming the defects of the above-mentioned prior art is an urgent problem to be solved in this technical field. Summary of the Invention

[0004] In view of the above problems, the present invention proposes a dual-rotor experimental device, comprising: a base, an outer rotor shaft, an inner rotor shaft and a drive assembly; The base is provided with a through cavity, and a first rolling bearing, a second rolling bearing, and a third rolling bearing are coaxially arranged in sequence on the inner wall of the through cavity. One end of the outer rotor shaft is rotatably sleeved with the inner wall of the third rolling bearing, and a coaxially arranged hollow cavity is provided in the outer rotor shaft. One end of the inner rotor shaft is rotatably sleeved with the inner walls of the first rolling bearing and the second rolling bearing, and the other end of the inner rotor shaft extends into the hollow cavity of the outer rotor shaft. A driving assembly is installed on the side wall of the base, and an output end of the driving assembly extends into the through cavity and forms a transmission connection with the outer rotor shaft.

[0005] Furthermore, the base includes a front mounting seat, a lower support seat and an upper support seat, the outer wall of the lower support seat is sleeved with the upper support seat, a lubricating oil chamber is formed between the outer wall of the lower support seat and the inner wall of the upper support seat, the front mounting seat is coaxially connected to the lower support seat, and the inner cavities of the front mounting seat and the lower support seat jointly form a through cavity; The inner cavity of the front mounting seat is provided with a coaxially arranged front mounting seat, the inner wall of the front mounting seat is provided with a first rolling bearing and a second rolling bearing, and the inner wall of the lower support seat is coaxially provided with a third rolling bearing; The side wall of the lower support seat is provided with a plurality of first through holes communicating with the lubricating oil cavity and penetrating the cavity.

[0006] Furthermore, the side wall of the upper support seat is provided with an air supply one-way valve and an oil return one-way valve that are connected to the cavity. Several oil return one-way valves are symmetrically arranged on the side walls at both ends of the upper support seat, and the several oil return one-way valves at both ends are arranged in a circular array about the axial center line of the upper support seat.

[0007] Furthermore, a one-way oil inlet port communicating with the lubricating oil cavity is provided on the side wall of the base, and the one-way oil inlet port is communicated with an external lubricating oil pipeline.

[0008] Furthermore, a predetermined distance is maintained between the outer wall of the front mounting seat and the inner wall of the front mounting seat, and a plurality of second through holes are opened on the side wall of the front mounting seat, and the plurality of second through holes are located between the first rolling bearing and the second rolling bearing.

[0009] Furthermore, it also includes a first elastic support and a second elastic support, one end of the second elastic support is fixedly sleeved with the inner wall of the lower support seat, the other end of the second elastic support is coaxially connected to the third rolling bearing, and the outer wall of the third rolling bearing is slidably sleeved with the inner wall of the lower support seat; One end of the first elastic support is fixedly sleeved with the inner wall of the front mounting seat, and the other end of the first elastic support is coaxially connected to the second rolling bearing. The outer wall of the second rolling bearing is slidably sleeved with the inner wall of the front mounting seat.

[0010] Furthermore, the drive assembly includes a box body, in which an output shaft is rotatably installed, one end of the output shaft extends out of the box body for connecting to a drive motor, the output shaft is connected to one end of a transmission shaft through a bevel gear transmission, and the other end of the transmission shaft extends to the through cavity and is connected to one end of the outer rotor shaft through a bevel gear transmission.

[0011] Furthermore, the outer wall of the upper support seat is connected to two symmetrically arranged mounting parts, and the mounting parts are provided with threaded through holes for mounting.

[0012] Compared with the prior art, the embodiments of the present invention have at least the following advantages: 1. The dual-rotor experimental device proposed in the present invention houses the first, second, and third rolling bearings within a through-hole cavity of the base, replacing the conventional technical solution of providing three support seats for the first, second, and third rolling bearings, thereby reducing the number of support seats. Compared to the weight of three support seats, the present application proposes a single base, thereby reducing the overall weight and further improving the overall rigidity. 2. The distances between the first and second rolling bearings, and between the second and third rolling bearings, are directly shortened. Without changing the axial lengths of the outer and inner rotor shafts, the length of the rotor system along the rotation axis is reduced to meet the test requirements of UAV turbofan / turbojet engines with shorter rotors. This further reduces the overall weight and improves the overall power-to-weight ratio. 3. The outer rotor shaft and the drive assembly are connected in transmission inside the base, and the output end of the inner rotor shaft is built into the inner cavity of the base, thereby achieving overall fixation of the outer rotor shaft, the inner rotor shaft and the drive assembly, directly improving the overall stability.

[0013] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 A schematic diagram of a dual-rotor experimental device according to an embodiment of the present invention is shown; Figure 2 A cross-sectional schematic diagram of a dual-rotor experimental device according to an embodiment of the present invention is shown; Figure 3 A partial cross-sectional schematic diagram of a dual-rotor experimental device according to an embodiment of the present invention is shown; Figure 4 A transmission structure diagram of a dual-rotor experimental device in an embodiment of the present invention is shown.

[0016] In the figure, base 1, front mounting seat 101, lower support seat 102, upper support seat 103, mounting portion 104, outer rotor shaft 2, inner rotor shaft 3, drive assembly 4, housing 401, output shaft 402, transmission shaft 403, through cavity 5, first rolling bearing 6, second rolling bearing 7, third rolling bearing 8, first through hole 9, air supply one-way valve 10, oil return one-way valve 11, oil inlet one-way port 12, second through hole 13, first elastic support 14, second elastic support 15. DETAILED DESCRIPTION

[0017] The following description provides many different embodiments or examples for implementing different features of the present invention. The components and arrangements described in the following specific examples are only used to simplify the present invention and are only used as examples, not to limit the present invention.

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. 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 making creative efforts shall fall within the scope of protection of the present invention.

[0019] The present invention provides a dual-rotor experimental device. Figure 1 A schematic diagram of a dual-rotor experimental device in an embodiment of the present invention is shown, with reference to Figure 1 、 Figure 2 and Figure 3 The dual-rotor experimental device includes: a base 1, an outer rotor shaft 2, an inner rotor shaft 3 and a drive assembly 4; The base 1 defines a through cavity 5, the inner wall of which is coaxially and sequentially spaced apart from each other, with a first rolling bearing 6, a second rolling bearing 7, and a third rolling bearing 8. One end of the outer rotor shaft 2 is rotatably sleeved with the inner wall of the third rolling bearing 8, and a coaxially arranged hollow cavity is defined within the outer rotor shaft 2. One end of the inner rotor shaft 3 is rotatably sleeved with the inner walls of both the first and second rolling bearings 6 and 7, and the other end of the inner rotor shaft 3 extends into the hollow cavity of the outer rotor shaft 2. The drive assembly 4 is mounted on the side wall of the base 1 , and the output end of the drive assembly 4 extends into the through cavity 5 and forms a transmission connection with the outer rotor shaft 2 .

[0020] The dual-rotor experimental device proposed in the present invention houses the first rolling bearing 6, the second rolling bearing 7, and the third rolling bearing 8 within the through-hole cavity 5 of the base 1. This replaces the conventional technical solution of providing three support seats for the first rolling bearing 6, the second rolling bearing 7, and the third rolling bearing 8, thereby reducing the number of support seats. Furthermore, compared to the weight of three support seats, the present application reduces the overall weight by proposing a single base 1. At the same time, the spacing between the first rolling bearing 6 and the second rolling bearing 7, and between the second rolling bearing 7 and the third rolling bearing 8 is directly shortened. Without changing the axial length of the outer rotor shaft 2 and the inner rotor shaft 3, the length of the rotor system along the rotation axis (i.e., the longitudinal center line of the rotor) is reduced to meet the test requirements of the shorter rotor itself of the turbofan / turbojet engine for UAVs, further meet the overall weight reduction, improve the overall compactness, and improve the overall power-to-weight ratio.

[0021] The outer rotor shaft 2 and the drive assembly 4 are connected in transmission inside the base 1, and the output end of the inner rotor shaft 3 is built into the inner cavity of the base 1, thereby achieving overall fixation of the outer rotor shaft 2, the inner rotor shaft 3 and the drive assembly 4, directly improving the overall stability.

[0022] exist Figure 2 In the example shown, the base 1 includes a front mounting seat 101, a lower support seat 102, and an upper support seat 103. The outer wall of the lower support seat 102 is sleeved with the upper support seat 103, and a lubricating oil chamber 102 is formed between the outer wall of the lower support seat 102 and the inner wall of the upper support seat 103. The front mounting seat 101 is coaxially connected to the lower support seat 102, and the inner cavities of the front mounting seat 101 and the lower support seat 102 together form a through cavity 5. The inner cavity of the front mounting seat 101 is provided with a coaxially arranged front mounting seat 101, and the inner wall of the front mounting seat 101 is provided with a first rolling bearing 6 and a second rolling bearing 7. The front mounting seat 101 is used to rotatably sleeve the inner rotor shaft 3; The inner wall of the lower support seat 102 is coaxially provided with a third rolling bearing 8, and the lower support seat 102 is used for rotating and sleeved with the outer rotor shaft 2; The side wall of the lower support seat 102 is provided with a plurality of first through holes 9 connecting the lubricating oil chamber 102 and the through-cavity 5, so that the lubricating oil chamber 102 is connected with the inner cavity of the through-cavity 5. In actual use, the lubricating oil chamber 102 is used to load lubricating oil, and then the lubricating oil enters the through-cavity 5 through the lubricating oil chamber 102. The lubricating oil forms a coating on the first rolling bearing 6, the second rolling bearing 7, the third rolling bearing 8 and the output end of the drive component 4 in the through-cavity 5, thereby ensuring the lubrication effect on the first rolling bearing 6, the second rolling bearing 7, the third rolling bearing 8 and the output end of the drive component 4.

[0023] In addition, the present application realizes lubrication operations on the first rolling bearing 6, the second rolling bearing 7, the third rolling bearing 8 and the output end of the drive component 4 by opening a single lubricating oil chamber 102. Compared with the traditional need to set up lubricating oil pipelines for each of the four locations, the integrity of the device after integration is greatly improved, and compared with the conventional four lubricating oil pipelines, the weight is further reduced, the overall power-to-weight ratio of the rotor is further improved, and the operating power is improved.

[0024] In this case, the side wall of the upper support seat 103 is provided with an air supply one-way valve 10 and an oil return one-way valve 11 connected to the through-cavity 5. When negative pressure is formed in the through-cavity 5, external air is added to the through-cavity 5 through the air supply one-way valve 10 to ensure the lubricating oil pressure in the through-cavity 5 and the lubricating oil chamber 102; and an extrusion oil film is formed at the second rolling bearing 7 and the third rolling bearing 8, thereby providing external damping to achieve vibration reduction and limiting of the entire device.

[0025] Among them, there are multiple return oil one-way valves 11, and several of the return oil one-way valves 11 are symmetrically arranged on the side walls at both ends of the upper support seat 103, and the multiple return oil one-way valves 11 at both ends are arranged in a circular array about the axis of the upper support seat 103.

[0026] In the process of replacing the lubricating oil or disassembling and repairing the base 1, the lubricating oil in the lubricating oil chamber 102 is discharged through the return oil one-way valve 11. For example, based on the complex use environment of the rotor device and the roll angle and pitch angle during the movement of the space gyroscope, the number of the return oil one-way valves 11 is set to three, and the center angle of adjacent return oil one-way valves 11 is 120° to ensure smooth oil return in any space movement posture.

[0027] In addition, a one-way oil inlet 12 communicating with the lubricating oil chamber 102 is provided on the side wall of the base 1 . The one-way oil inlet 12 is communicated with an external lubricating oil pipeline for replenishing lubricating oil to the lubricating oil chamber 102 .

[0028] Although the above description uses the example of three oil return check valves 11 provided on the side wall of one end of the support seat 103 as an example, the present invention is not limited thereto. The number of oil return check valves 11 can be connected in various ways. Those skilled in the art can comprehensively consider the connection principles of the present invention and actual application conditions, as long as the principles of the present invention can be implemented.

[0029] In this case, a predetermined distance is maintained between the outer wall of the front mounting seat 101 and the inner wall of the front mounting seat 101. On the basis of the lubricating oil cavity 102 and the through cavity 5, a third-level cavity is formed by the outer wall of the front mounting seat 101 and the inner wall of the front mounting seat 101, thereby limiting the flow order and supply amount of the lubricating oil. In addition, a plurality of second through holes 13 are provided on the side wall of the front mounting seat 101. The plurality of second through holes 13 are located between the first rolling bearing 6 and the second rolling bearing 7, guiding the lubricating oil between the outer wall of the front mounting seat 101 and the inner wall of the front mounting seat 101 to be input from the position between the first rolling bearing 6 and the second rolling bearing 7, thereby achieving lubrication of the first rolling bearing 6 and the second rolling bearing 7 on both sides.

[0030] exist Figure 3 In the illustrated example, a second elastic support 15 and a first elastic support 14 are further included. One end of the second elastic support 15 is fixedly sleeved with the inner wall of the lower support seat 102, and the other end of the second elastic support 15 is coaxially connected to the third rolling bearing 8. The outer wall of the third rolling bearing 8 is slidably sleeved with the inner wall of the lower support seat 102. The second elastic support 15 is used to axially fix the third rolling bearing 8 and buffer the axial force of the third rolling bearing 8, thereby achieving axial vibration reduction of the outer rotor shaft 2. One end of the first elastic support 14 is fixedly sleeved with the inner wall of the front mounting seat 101, and the other end of the first elastic support 14 is coaxially connected to the second rolling bearing 7. The outer wall of the second rolling bearing 7 is slidingly sleeved with the inner wall of the front mounting seat 101. The first elastic support 14 is used to axially fix the second rolling bearing 7, buffer the axial force of the second rolling bearing 7, and achieve axial vibration reduction of the inner rotor shaft 3.

[0031] exist Figure 4 In the example shown, the drive assembly 4 includes a housing 401, in which an output shaft 402 is rotatably installed. One end of the output shaft 402 extends out of the housing 401 for connecting to a drive motor (not shown in the figure). The output shaft 402 is connected to one end of a transmission shaft 403 through a bevel gear transmission. The other end of the transmission shaft 403 extends to the through-cavity 5 and is connected to one end of the outer rotor shaft 2 through a bevel gear transmission. The outer rotor shaft 2 is driven by two sets of bevel gear transmission groups.

[0032] In this embodiment, the output shaft 402 is arranged in parallel with the outer rotor shaft 2, so that the drive motor connected to the output shaft 402 meets the requirement of being placed horizontally, thereby improving the convenience of replacing and installing the drive motor.

[0033] In this case, the outer wall of the upper support seat 103 is connected to two symmetrically arranged mounting parts 104. The mounting parts 104 are provided with threaded through holes for installation, and the mounting parts 104 are assembled with the experimental table through the threaded through holes.

[0034] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the specified features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0035] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical, electrical, or intercommunication connections; direct or indirect connections through an intermediary; and may encompass internal connectivity between multiple components or interactions between multiple components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0036] In the description of the present invention, it should be understood that all terms used to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention 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 operate in a specific orientation, and cannot be understood as a limitation on the present invention.

[0037] Although the present invention 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 make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual-rotor experimental device, characterized in that: include: A base (1), an outer rotor shaft (2), an inner rotor shaft (3), and a drive assembly (4); The base (1) is provided with a through cavity (5), the inner wall of the through cavity (5) is coaxially provided with a first rolling bearing (6), a second rolling bearing (7), and a third rolling bearing (8) in sequence, one end of the outer rotor shaft (2) is rotatably sleeved with the inner wall of the third rolling bearing (8), and a coaxially arranged hollow inner cavity is provided inside the outer rotor shaft (2), one end of the inner rotor shaft (3) is rotatably sleeved with the inner walls of the first rolling bearing (6) and the second rolling bearing (7), and the other end of the inner rotor shaft (3) extends to the hollow inner cavity of the outer rotor shaft (2); A drive assembly (4) is mounted on the side wall of the base (1), and an output end of the drive assembly (4) extends into the through cavity (5) and forms a transmission connection with the outer rotor shaft (2).

2. The dual-rotor experimental device according to claim 1, characterized in that: The base (1) comprises a front mounting seat (101), a lower support seat (102) and an upper support seat (103); the outer wall of the lower support seat (102) is sleeved with the upper support seat (103); a lubricating oil cavity (102) is formed between the outer wall of the lower support seat (102) and the inner wall of the upper support seat (103); the front mounting seat (101) is coaxially connected to the lower support seat (102); the inner cavities of the front mounting seat (101) and the lower support seat (102) jointly form a through cavity (5); The inner cavity of the front mounting seat (101) is provided with a coaxially arranged front mounting seat (101), the inner wall of the front mounting seat (101) is provided with a first rolling bearing (6) and a second rolling bearing (7), and the inner wall of the lower support seat (102) is coaxially provided with a third rolling bearing (8); The side wall of the lower support seat (102) is provided with a plurality of first through holes (9) communicating with the lubricating oil cavity (102) and penetrating the cavity (5).

3. The dual-rotor experimental device according to claim 2, characterized in that: The side wall of the upper support seat (103) is provided with an air supply check valve (10) and an oil return check valve (11) that are connected to the through-cavity (5). A plurality of the oil return check valves (11) are symmetrically arranged on the side walls at both ends of the upper support seat (103), and the plurality of oil return check valves (11) at both ends are arranged in a circular array about the axis of the upper support seat (103).

4. The dual-rotor experimental device according to claim 3, characterized in that: The side wall of the base (1) is provided with an oil inlet one-way port (12) communicating with the lubricating oil cavity (102), and the oil inlet one-way port (12) is communicated with an external lubricating oil pipeline.

5. The dual-rotor experimental device according to claim 2, characterized in that: A predetermined distance is maintained between the outer wall of the front side mounting seat (101) and the inner wall of the front side mounting seat (101), and a plurality of second through holes (13) are provided on the side wall of the front side mounting seat (101), wherein the plurality of second through holes (13) are located between the first rolling bearing (6) and the second rolling bearing (7).

6. The dual-rotor experimental device according to claim 5, characterized in that: It also includes a first elastic support (14) and a second elastic support (15), one end of the second elastic support (15) is fixedly sleeved with the inner wall of the lower support seat (102), and the other end of the second elastic support (15) is coaxially connected to the third rolling bearing (8), and the outer wall of the third rolling bearing (8) is slidably sleeved with the inner wall of the lower support seat (102); One end of the first elastic support (14) is fixedly sleeved with the inner wall of the front mounting seat (101), the other end of the first elastic support (14) is coaxially connected to the second rolling bearing (7), and the outer wall of the second rolling bearing (7) is slidably sleeved with the inner wall of the front mounting seat (101).

7. The dual-rotor experimental device according to any one of claims 2 to 6, characterized in that: The drive assembly (4) comprises a housing (401), an output shaft (402) being rotatably mounted in the housing (401), one end of the output shaft (402) extending out of the housing (401) for connection to a drive motor, the output shaft (402) being connected to one end of a transmission shaft (403) via a bevel gear transmission, the other end of the transmission shaft (403) extending to the through-cavity (5) and being connected to one end of an outer rotor shaft (2) via a bevel gear transmission.

8. The dual-rotor experimental device according to claim 7, characterized in that: The outer wall of the upper support seat (103) is connected to two symmetrically arranged mounting portions (104), and the mounting portions (104) are provided with threaded through holes for mounting.

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