An aero-engine unbalance fault simulation test device and method

Abstract

The application belongs to the field of aero-engine fault simulation, and relates to an aero-engine unbalance fault simulation test device and method, which comprises a driving connecting disc, a rotating shaft and an unbalance amount mutation rotating disc. The unbalance amount mutation rotating disc is provided with a fixing device between the unbalance amount mutation rotating disc and the rotating shaft. The unbalance amount mutation rotating disc comprises a rotating disc and an installation cylinder capable of containing liquid. A plurality of groups of threaded holes are formed in the circumferential direction of the rotating disc. The installation cylinder is threadedly connected to the installation hole. An inner cavity and an outer cavity are coaxially arranged in the interior of the installation cylinder. The inner cavity and the outer cavity are in communication with each other. An elastic plugging device is arranged at one end of the outer cavity close to the inner cavity. The elastic plugging device comprises a conical sealing plug and a spring. When the rotating speed reaches a certain value, the centrifugal force of the conical sealing plug is greater than the elastic force of the spring, the change of the unbalance amount is realized, and the influence of the sudden change of the unbalance on the rotor system and the vibration characteristic test research purpose are realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of aero-engine fault simulation, and particularly relates to an aero-engine unbalance fault simulation test device and method. BACKGROUND

[0002] Among the vibration faults of aero-engines, the vibration faults caused by rotor unbalance account for a large proportion, and the reason is mainly that the rotor unbalance changes under the working environment of variable temperature and variable speed.

[0003] The working environment of the rotor of an aero-engine is complex and changeable, and the local elastic deformation of the rotor structure, the change of the bolt connection tightness, the local structure of the rotor rubbing and heating, etc. will all cause the rotor to change unbalance, thereby causing relatively obvious vibration changes, and part of the unbalance changes are even sudden changes.

[0004] Since it is impossible to study the fault characteristics on a real engine, using a rotor tester to simulate the rotor vibration performance caused by unbalance changes is one of the important means to study the unbalance fault characteristics.

[0005] There are many testers capable of studying rotor unbalance vibration at present, but they can only pre-set the unbalance amount under static state, and there is no test device for realizing sudden change of the unbalance amount in the process of rotor operation by using the specific structure of a rotating disc.

[0006] Therefore, how to realize the unbalance vibration research in the process of rotor motion is a problem to be solved. SUMMARY

[0007] The application aims to provide an aero-engine unbalance fault simulation test device and method to solve the problem that only the unbalance amount can be set in static state for rotor unbalance vibration research in the prior art.

[0008] The technical scheme of the present application is: an aero-engine unbalance fault simulation test device, comprising a driving connection disc, a rotating shaft and an unbalance amount mutation rotating disc; the driving connection disc and the unbalance amount mutation rotating disc are coaxially arranged, one end of the rotating shaft is connected with the driving connection disc, the middle part is connected with the unbalance amount mutation rotating disc, and the other end is provided with a roller bearing mounting seat; the rotating shaft is provided with a ball bearing mounting seat corresponding to the position between the driving connection disc and the unbalance amount mutation rotating disc; the unbalance amount mutation rotating disc comprises a disc body and an installation cylinder capable of containing liquid, a plurality of groups of threaded holes are formed in the disc body in the circumferential direction, the installation cylinder is threadedly connected in the threaded hole, coaxially arranged inner and outer cavities are arranged in the installation cylinder, the inner and outer cavities are in communication with each other, liquid is injected into the inner cavity, and the outer cavity is provided with an elastic sealing device at one end close to the inner cavity; when the rotating speed in the unbalance amount mutation rotating disc reaches a certain value, the elastic sealing device moves into the outer cavity, and the liquid in the inner cavity flows to the outer cavity in the gap.

[0009] Preferably, the elastic sealing device comprises a conical sealing plug and a spring, the installation cylinder is further provided with an inner side plug and an outer side plug, the inner and outer cavities are both provided with internal threads, the internal threads in the inner cavity are matched with the inner side plug and the installation groove, and the internal threads in the outer cavity are matched with the outer side plug; a conical cavity is formed at one end of the outer cavity close to the inner cavity, and the conical sealing plug is inserted into the conical cavity; the spring is sleeved outside the conical sealing plug, and the other end of the spring is fixed on the inner wall of the outer cavity.

[0010] Preferably, the outer diameter of the conical sealing plug and the inner diameter of the outer cavity are gap matched, and the liquid is water.

[0011] Preferably, the outer side cavity is provided with a step surface corresponding to the threaded bottom of the outer side plug, a sealing rubber ring is sleeved on the step surface, and the gap value between the threaded length of the outer side plug and the threaded length of the outer side cavity is slightly smaller than the diameter of the sealing rubber ring.

[0012] Preferably, the threaded length of the inner side plug is smaller than the threaded length in the inner cavity; and the total length of the inner side plug is smaller than the length of the installation groove.

[0013] As a specific embodiment, an aero-engine unbalance fault simulation test method, comprising:

[0014] The unbalance mutation rotating disc is fixed on the rotating shaft through the fixing device, the driving connecting disc is installed on the power equipment, the ball bearing mounting seat and the roller bearing mounting seat are fixed on the rotating shaft, the roller bearing and the roller bearing are respectively installed on the ball bearing mounting seat and the roller bearing mounting seat, and the outer sides of the ball bearing and the roller bearing are connected with the support;

[0015] The inner side plug and the installation cylinder are installed in the threaded hole on one side;

[0016] The test shaft is manually rotated, and the outer side plug installation hole direction of the side where only the installation cylinder and the inner side plug are installed on the rotating disc is upward;

[0017] A certain amount of water is injected into the inner side cavity of the installation cylinder;

[0018] The conical sealing plug, the spring, the sealing rubber ring and the outer side plug are sequentially installed;

[0019] The tester is started, and when the rotating speed of the unbalance mutation rotating disc is less than n, the counterweight is installed on the balance mutation rotating disc to perform rotor dynamic balancing;

[0020] The rotating speed of the unbalance mutation rotating disc is controlled to reach the test rotating speed n, the conical sealing plug moves outward, the water in the inner side cavity flows outward through the gap of the conical sealing, and the designed rotor unbalance is reached.

[0021] The aviation engine unbalance fault simulation test device and method provided in the application include a driving connecting disc, a rotating shaft and an unbalance mutation rotating disc. A fixing device is arranged between the unbalance mutation rotating disc and the rotating shaft. The unbalance mutation rotating disc includes a rotating disc and an installation cylinder capable of containing liquid. A plurality of groups of threaded holes are arranged in the circumferential direction of the rotating disc. The installation cylinder is threadedly connected to the installation hole. An inner side cavity and an outer side cavity are coaxially arranged in the installation cylinder. The inner side cavity and the outer side cavity are in communication with each other. An elastic plugging device is arranged at one end of the outer side cavity close to the inner side cavity. The elastic plugging device includes a conical sealing plug and a spring. When the rotating speed reaches a certain value, the centrifugal force of the conical sealing plug is greater than the elastic force of the spring, the change of the unbalance is realized, and the influence and vibration characteristic test research purpose of the sudden change of the unbalance on the rotor system are realized. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions provided in the application, the drawings will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the application.

[0023] Figure 1 It is a sectional view of the overall structure of the application;

[0024] Figure 2 Figure 3 is a partial cross-sectional view of the unbalance mutation rotating disc according to the present application;

[0025] Figure 3 Figure 4 is a partial cross-sectional view of the disc body structure according to the present application;

[0026] Figure 4 Figure 5 is a cross-sectional view of the cylinder structure according to the present application;

[0027] Figure 5 Figure 6 is a structure schematic view of the inner side plug according to the present application;

[0028] Figure 6 Figure 7 is a structure schematic view of the outer side plug according to the present application;

[0029] Figure 7 Figure 8 is a structure schematic view of the conical sealing plug according to the present application;

[0030] Figure 8 Figure 9 is a partial cross-sectional view of the unbalance mutation rotating disc according to the present application when rotating at a speed less than n;

[0031] Figure 9 Figure 10 is a partial cross-sectional view of the unbalance mutation rotating disc according to the present application when rotating at a speed close to or greater than n.

[0032] 1. driving connection disc; 2. rotating shaft; 3. unbalance mutation rotating disc; 4. roller bearing mounting seat; 5. ball bearing mounting seat; 6. fixing device; 7. disc body; 8. mounting cylinder; 9. inner side cavity; 10. outer side cavity; 11. inner side plug; 12. outer side plug; 13. conical sealing plug; 14. spring; 15. sealing rubber ring; 16. threaded hole; 17. mounting groove. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0034] An aero-engine unbalance fault simulation test device, like Figure 1, including a driving connecting disc 1, a rotating shaft 2 and an unbalance amount mutation rotating disc 3. The driving connecting disc 1 and the unbalance amount mutation rotating disc 3 are coaxially arranged, one end of the rotating shaft 2 is connected with the driving connecting disc 1, the middle part is connected with the unbalance amount mutation rotating disc 3, and the other end is provided with a roller bearing mounting seat 4, and the rotating shaft 2 is provided with a ball bearing mounting seat 5 corresponding to the position between the driving connecting disc 1 and the unbalance amount mutation rotating disc 3. The driving connecting disc 1 is connected with the power equipment of the test device, and the ball bearing mounting seat 5 and the roller bearing mounting seat 4 are used to support the rotating shaft 2. The unbalance amount mutation rotating disc 3 is provided with a fixing device 6 between the rotating shaft 2, and the fixing device 6 can be used to fix the unbalance amount mutation rotating disc 3 by means of bolts, pins and the like.

[0035] The unbalance amount mutation rotating disc 3 is the core element of the application, and the principle of the unbalance amount exerted by the unbalance amount mutation rotating disc 3 is to change the unbalance amount by moving the liquid.

[0036] As Figures 2-4 , the unbalance amount mutation rotating disc 3 comprises a disc body 7 and an installation cylinder 8 capable of containing liquid. The disc body 7 is provided with a through hole in the middle part, and the through hole is fixed to the rotating shaft 2 through the fixing device 6. A plurality of groups of threaded holes 16 are arranged in the circumferential direction of the disc body 7, and the outer ends of the threaded holes 16 are located at the outer edges of the unbalance amount mutation rotating disc 3, and the inner ends extend into the interior of the unbalance amount mutation rotating disc 3. The inner end of the threaded hole 16 is provided with a hexagonal installation groove 17.

[0037] The installation cylinder 8 has a plurality of groups, and the installation cylinder 8 is threadedly connected in the threaded hole 16. One end of the installation cylinder 8 is in the shape of a hexagonal bolt head, and the inside of the installation cylinder 8 is provided with coaxially arranged inner and outer cavities 9 and 10. The inner and outer cavities 9 and 10 are in communication with each other, and the inner and outer cavities 9 and 10 are both provided with internal threads.

[0038] The installation cylinder 8 is provided with an inner plug 11, an outer plug 12 and a conical sealing plug 13. The internal threads in the inner cavity 9 cooperate with the inner plug 11 and the installation groove 17, and the internal threads in the outer cavity 10 cooperate with the outer plug 12. The end of the outer cavity 10 close to the inner cavity 9 is provided with a conical cavity, and the conical sealing plug 13 is inserted into the conical cavity.

[0039] The outer diameter of the conical sealing plug 13 and the inner diameter of the outer cavity 10 are in small gap cooperation, and the conical angle α of the conical sealing plug 13 is consistent with the conical angle α of the conical cavity. The conical surface has high surface finish, and the outer conical surface of the conical sealing plug 13 is provided with a plurality of grooves in the circumferential direction. The conical sealing plug 13 is provided with a spring 14 on the outside, and the other end of the spring 14 is fixed on the inner wall of the outer cavity 10. Under the elastic force of the spring 14, the conical sealing plug 13 effectively seals the connection part of the outer cavity 10 and the inner cavity 9.

[0040] The inner cavity 9 is filled with liquid, preferably water, and other liquids, when the inner cavity 9 is filled with liquid, the conical sealing plug 13 is blocked by the elastic force of the spring 14, so that the liquid does not overflow; only when the centrifugal force of the conical sealing plug 13 is greater than the elastic force of the spring 14, the liquid can flow from the inner cavity 9 to the outer cavity 10, realizing the sudden change of the rotor imbalance.

[0041] The centrifugal force of the conical sealing plug 13 is controlled by the rotating speed of the imbalance mutation rotating disc 3, when the rotating speed reaches a certain value, the centrifugal force of the conical sealing plug 13 is greater than the elastic force of the spring 14, realizing the change of the imbalance. The rotating speed change of the imbalance mutation rotating disc can be stably controlled during the rotor movement to meet the sudden change of the imbalance caused by the local elastic deformation of the aero-engine, the change of the bolt connection tightness, the local structure of the rotor and the heat caused by the collision, so as to realize the influence and vibration characteristic test research purpose of the sudden change of the imbalance to the rotor system.

[0042] As Figures 5-7 In order to improve the sealing performance, a step surface is arranged on the threaded bottom of the outer cavity 10 corresponding to the outer plug cover 12, and a sealing rubber ring 15 is sleeved on the step surface to improve the sealing performance. In order to ensure that the sealing rubber ring 15 can play a role, the gap value between the threaded length L6 of the outer plug cover 12 and the threaded length L3 of the outer cavity 10 is slightly smaller than the diameter of the sealing rubber ring 15.

[0043] In order to ensure the sealing performance of the inner cavity 9, the threaded length L4 of the inner plug cover 11 is smaller than the threaded length L2 in the inner cavity 9; and the total length L5 of the inner plug cover 11 is smaller than the length of the installation groove 17, so as to facilitate the installation of L1.

[0044] As a specific embodiment, it also includes an aero-engine imbalance fault simulation test method, which specifically includes the following steps:

[0045] 1. The imbalance mutation rotating disc 3 is fixed on the rotating shaft 2 through the fixing device 6, the driving connecting disc 1 is installed on the power equipment, the ball bearing mounting seat 5 and the roller bearing mounting seat 4 are fixed to the rotating shaft 2, the ball bearing and the roller bearing are respectively installed on the ball bearing mounting seat 5 and the roller bearing mounting seat 4, and the ball bearing and the roller bearing are respectively installed on the ball bearing mounting seat 5 and the roller bearing mounting seat 4. The outer side of the ball bearing and the roller bearing is connected with the support.

[0046] 2. The inner plug cover 11 and the installation cylinder 8 are installed in the threaded hole 16 on one side.

[0047] 3. Rotate the test shaft manually, and install the outer plug cover 12 installation hole direction of the side of the rotating disc on which only the installation cylinder 8 and the inner plug cover 11 are installed upward;

[0048] 4, Inject a certain amount of water into the inner cavity 9 of the installation cylinder 8 (as shown); Figure 8

[0049] 5, Install the conical sealing plug 13, spring 14, sealing rubber ring 15 and outer plug cover 12 in turn (note that at this time, try not to make the rotating shaft 2 rotate, causing water loss), the conical sealing plug 13 will seal the water in the inner cavity 9;

[0050] The selection principle of the spring 14 in the unbalance amount mutation rotating disc 3 is:

[0051] 1) Set the unbalance fault simulation test speed n in advance;

[0052] 2) Calculate the centrifugal force F1 generated by the conical sealing plug 13 at the test speed n;

[0053] 3) Select a suitable spring 14, and the compression elastic force in the installed state is the same as the centrifugal force F1 generated by the conical sealing plug 13.

[0054] 6, After other work is ready, start the tester; due to one side being injected with water and the other side not being injected with water, the rotor has an initial unbalance, and the rotor dynamic balance can be performed by adding counterweights to the dynamic balance screw hole 16 on the unbalance amount mutation rotating disc 3 when the speed is less than n, so as to reduce the initial unbalance of the rotor;

[0055] 7, Control the speed of the unbalance amount mutation rotating disc 3 to be around the test speed n, because the centrifugal force of the conical sealing plug 13 is greater than the elastic force of the spring 14, the conical sealing plug 13 moves outward, and then the water in the inner cavity 9 will flow outward through the gap of the conical sealing, thereby causing a sudden change in the rotor unbalance, until the designed rotor unbalance is reached, and the test purpose is achieved (as shown). Figure 9

[0056] Finally, it should be noted that the disclosure of the embodiment of the application only relates to the structure involved in the disclosure of the embodiment of the application, and other structures can refer to the usual design, and in the case of no conflict, the same embodiment and different embodiments of the application can be combined with each other;

[0057] Finally: the above only describes the preferred embodiments of the application and is not used to limit the application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application should be included in the protection scope of the application.​​

Claims

1. An aeroengine unbalance fault simulation test apparatus, characterized in that: The utility model relates to a kind of rotating disc of sudden change of unbalance amount, including drive connecting disc (1), rotating shaft (2) and unbalance amount sudden change rotating disc (3);The drive connecting disc (1) and unbalance amount sudden change rotating disc (3) are coaxially arranged, one end of the rotating shaft (2) is connected with drive connecting disc (1), middle part is connected with unbalance amount sudden change rotating disc (3), another end is equipped with roller bearing mounting seat (4), the rotating shaft (2) is equipped with ball bearing mounting seat (5) between the position corresponding drive connecting disc (1) and unbalance amount sudden change rotating disc (3);The unbalance amount sudden change rotating disc (3) includes disc body (7) and the installation cylinder (8) capable of containing liquid, the disc body (7) is along circumferential and is equipped with multiple groups of thread holes (16), the installation cylinder (8) is threadedly connected in thread hole (16), the inside of installation cylinder (8) is equipped with coaxially arranged inner cavity (9) and outer cavity (10), the inner cavity (9) and outer cavity (10) are interconnected, liquid is injected into the inner cavity (9), the outer cavity (10) is equipped with elastic plugging device near one end of inner cavity (9), when unbalance amount sudden change rotating disc (3) rotation speed reaches certain value, elastic plugging device will move to outer cavity (10), liquid in inner cavity (9) will flow to outer cavity (10) in the gap generated; The elastic plugging device includes conical sealing plug (13) and spring (14), the installation cylinder (8) is also equipped with inner side plug cover (11) and outer side plug cover (12), the inner cavity (9) and outer cavity (10) are equipped with internal thread, the internal thread in the inner cavity (9) is cooperated with inner side plug cover (11) and installation groove (17), the internal thread in the outer cavity (10) is cooperated with outer side plug cover (12);The outer cavity (10) is equipped with conical cavity near one end of inner cavity (9), the conical sealing plug (13) is inserted in conical cavity;The spring (14) is sleeved on the outside of conical sealing plug (13), another end of the spring (14) is fixed on the inner wall of outer cavity (10); The outer cavity (10) is equipped with a step surface corresponding to the threaded bottom of outer side plug cover (12), the step surface is sleeved with sealing rubber ring (15), the gap value of the threaded length of outer side plug cover (12) and the threaded length of outer cavity (10) is slightly smaller than the diameter of sealing rubber ring (15).

2. The aero-engine unbalance fault simulation test device of claim 1, wherein: The outer diameter of conical sealing plug (13) and the inner diameter of outer cavity (10) are gap fit, and the liquid is water.

3. The aero-engine unbalance fault simulation test device of claim 1, wherein: The threaded length of inner side plug cover (11) is smaller than the threaded length in inner cavity (9);And the total length of inner side plug cover (11) is smaller than the length of installation groove (17).

4. An aero-engine unbalance fault simulation test method using the test device of any one of claims 1-3, characterized in that, It includes: The unbalance mutation rotating disc (3) is fixed on the rotating shaft (2) through the fixing device (6), the driving connecting disc (1) is installed on the power equipment, the ball bearing mounting seat (5) and the roller bearing mounting seat (4) are fixed to the rotating shaft (2), the ball bearing and the roller bearing are respectively installed on the ball bearing mounting seat (5) and the roller bearing mounting seat (4), and the outer sides of the ball bearing and the roller bearing are connected with the support; The inner side plug (11) and the installation cylinder (8) are installed in the threaded hole (16) on one side; The outer side plug (12) installation hole direction of the rotating disc is installed upward by manually rotating the test shaft, and only the installation cylinder (8) and the inner side plug (11) on one side are installed; A certain amount of water is injected into the inner side cavity (9) of the installation cylinder (8); The conical sealing plug (13), the spring (14), the sealing rubber ring (15) and the outer side plug (12) are sequentially installed; The tester is started, the counterweight is added on the unbalance mutation rotating disc (3) when the rotating speed of the unbalance mutation rotating disc (3) is less than n, and the rotor dynamic balance is performed on the unbalance mutation rotating disc (3); The rotating speed of the unbalance mutation rotating disc (3) reaches the test rotating speed n, the conical sealing plug (13) moves outward, the water in the inner side cavity (9) flows outward through the gap of the conical sealing, and the designed rotor unbalance is reached.

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