CN201724799U - Vibration tester for inner-outer rotor systems - Google Patents

Abstract

The invention relates to a vibration test device for an internal and external rotor system, which belongs to the technical field of aero-engines. Including inner and outer rotors, the inner rotor is set inside the outer rotor, the inner and outer rotors are connected through intermediary bearings, and the outer rotor is connected with the bearing seat through supporting bearings; an inner bearing cover is arranged on the inner side of the bearing seat, and an inner bearing cover is arranged on the outer side of the bearing seat There is an outer bearing cover, and the end of the outer rotor is located in the oil chamber; one end of the outer rotor has a through hole, and the inner rotor at this end is connected to the second coupling through the through hole of the outer rotor and the through hole of the outer bearing cover in turn; The other end of the rotor is connected to one end of the flange cover of the outer rotor, and the other end of the flange cover of the outer rotor is connected to the first coupling through the through hole of the outer bearing cover; There are oil guide holes, a shaft disc is set on the outer circle of the outer rotor, and a sealing device is set between the inner and outer rotors at both ends of the outer rotor; an eddy current sensor connected to the upper computer is set on the inner and outer rotors or the shaft disc .

Description

A Vibration Test Device for Internal and External Rotor System

Technical field:

The utility model belongs to the technical field of aero-engines, in particular to a vibration test device for an inner and outer rotor system.

Background technique:

Modern aero-engines adopt a multi-rotor system structure with internal and external arrangements, most of which are internal and external dual-rotor structures. Compared with ordinary single-rotor and multi-span rotors (serial type and parallel type), the centrifugal force effect is more obvious in terms of stress stiffening and rotational softening, and the vibration behavior is more complex in this arrangement of inner and outer double rotors.

In view of the complex and expensive environment of aero-engines during test runs, using a model tester, that is, a special test device, to simulate or reproduce some vibration faults of the internal and external rotor systems of the engine can greatly reduce the test cost, and to a certain extent It can also play a guiding role in its manufacturing and repair process.

However, most of the existing rotor system vibration test devices are in the form of single rotor or multi-span rotors (serial type and parallel type). Vibration tests performed on such test devices cannot truly reflect the internal and external rotors of aero-engines. The basic vibration characteristics of the system.

For any kind of vibration test device of mechanical equipment, the established test device must meet the principle of "three similarities" with the actual machine as much as possible, that is: similar in structure, similar in kinematics and similar in dynamics. In order to carry out the vibration simulation test of the rotor system of the aero-engine better, according to the structural characteristics of the inner and outer rotor system of the aero-engine, it is also necessary to design and manufacture a test device that can simulate its vibration characteristics more realistically.

The vibration test device of the internal and external rotor system is required to meet the following aspects: In terms of structure, it should first be the internal and external rotor system, and its structural form should be the same as that of the actual machine, so that the test caused by the different structural forms can be eliminated to the greatest extent. Problem: In terms of kinematics, both the inner and outer rotors simulate the actual rotor to rotate, and the rotational speed should reach a level that can be controlled according to the needs, so as to achieve the greatest similarity with the actual machine; in terms of vibration and dynamics tests, the test device should be able to change Rotor speed, stiffness, and different forms of coupling misalignment are used to simulate different operating states of the engine rotor system.

Utility model content:

In the research on the vibration failure of the internal and external rotor systems of aero-engines, in order to overcome the shortcomings of the existing rotor system vibration test device that cannot effectively simulate the actual rotor system, and the shortcomings of single function, the utility model provides a device that can effectively simulate the actual rotor system. The vibration test device of the internal and external rotor system.

In order to achieve the above object, the utility model adopts the following technical scheme, a vibration test device of an inner and outer rotor system, including an inner rotor and an outer rotor, the inner rotor is arranged inside the outer rotor, and the inner rotor and the outer rotor are connected through an intermediary bearing , the outer rotor is connected to the bearing seat through a supporting bearing; an inner bearing cap is arranged on the inner side of the bearing seat, and an outer bearing cap having a through hole and an oil chamber is arranged on the outer side of the bearing seat, and the end of the outer rotor Located in the oil chamber; one end of the outer rotor has a through hole, and the inner rotor at this end is connected to the second coupling through the through hole of the outer rotor and the through hole of the outer bearing cover in turn; the other end of the outer rotor is connected to the One end of the flange cover of the outer rotor is connected, and the other end of the flange cover of the outer rotor is connected with the first coupling through the through hole of the outer bearing cover; an oil guide is provided at the end of the flange cover of the outer rotor connected to the outer rotor One end of the oil guide hole communicates with the oil chamber, and the other end corresponds to the intermediate bearing; a shaft disk is arranged outside the outer rotor, and the shaft disk is fixed on the outer circle of the outer rotor through a spring bushing. A first sealing device is provided between the inner rotor and the outer rotor at both ends of the rotor; an eddy current sensor is provided on the inner rotor, the outer rotor or the shaft disk, and the eddy current sensor is connected to the host computer.

The inner rotor adopts a hollow structure, and a second sealing device is provided at the hollow position of the inner rotor at the flange end of the outer rotor.

The outer rotor is connected with the flange cover of the outer rotor through screws.

Both the inner bearing cover and the outer bearing cover are connected with the bearing seat by screws.

The number of oil guide holes at the flange cover end of the outer rotor is set to six.

The beneficial effects of the utility model:

(1) The structure similarity of the vibration test device of the present utility model is high, avoiding the test invalidity caused by structural form difference;

(2) The vibration test device of the present utility model is easy to maintain and low in cost;

(3) The shaft disc and the outer rotor of the utility model are connected by a spring bushing, without using a shaft shoulder for fixing, so that the shaft disc can be fixed at any position on the outer circle of the outer rotor, and at the same time, it is convenient to adjust the number and type of the shaft disc , to meet different test requirements;

(4) The inner rotor of the utility model adopts a hollow structure, which has a high structural similarity with the actual aero-engine structure, and also reduces the quality of the test device, and provides some special requirements for tests (such as the chamber volume oil test). convenient;

(5) There is an oil cavity in the outer bearing cover of the utility model, and the hydraulic system provides lubricating oil under pressure to provide lubrication and cooling for the operation of the intermediate bearing and the supporting bearing; The hole can also meet the lubrication requirements for the intermediate bearing.

Description of drawings:

Fig. 1 is the structural representation of vibration test device of the present utility model;

Fig. 2 is an enlarged schematic diagram of part A of Fig. 1;

Among them, 1-support bearing; 2-intermediate bearing; 3-first coupling; 4-spring bushing; 5-outer bearing cover; 6-bearing seat; 7-inner bearing cover; Outer rotor; 11-oil guide hole; 12-oil cavity; 16-inner rotor; 17-outer rotor flange cover; 19-second coupling; 23-first sealing device; 24-second sealing device; 25 - eddy current sensor; 26 - host computer.

Detailed ways:

As shown in Figures 1 and 2, a vibration test device for an internal and external rotor system includes an internal rotor 16 and an external rotor 10. The internal rotor 16 is arranged inside the external rotor 10, and the internal rotor 16 and the external rotor 10 pass through an intermediate bearing. 2, the outer rotor 10 is connected to the bearing seat 6 through the supporting bearing 1; the inner bearing cover 7 is arranged on the inner side of the bearing seat 6, and the outer bearing cap 7 with a through hole and an oil chamber 12 is arranged on the outer side of the bearing seat 6. Bearing cover 5, the end of the outer rotor 10 is located in the oil chamber 12; one end of the outer rotor 10 has a through hole, and the inner rotor 16 at this end passes through the through hole of the outer rotor 10 and the through hole of the outer bearing cover 5 in sequence It is connected with the second coupling 19; the other end of the outer rotor 10 is connected with one end of the outer rotor flange cover 17, and the other end of the outer rotor flange cover 17 is connected to the first through hole of the outer bearing cover 5. The coupling 3 is connected; an oil guide hole 11 is provided at the end of the outer rotor flange cover 17 connected with the outer rotor 10, one end of the oil guide hole 11 communicates with the oil chamber 12, and the other end communicates with the intermediate bearing 2 Correspondingly: a shaft disc 8 is arranged outside the outer rotor 10, and the shaft disc 8 is fixed on the outer circle of the outer rotor 10 through a spring sleeve 4; a second A sealing device 23 ; an eddy current sensor 25 is provided on the inner rotor 16 , the outer rotor 10 or the shaft disk 8 , and the eddy current sensor 25 is connected to a host computer 26 . The outer rotor 10 and the outer rotor flange cover 17 are connected by screws, and the inner bearing cover 7 and the outer bearing cover 5 are connected to the bearing seat 6 by screws; the inner rotor 16 adopts a hollow structure, and the outer rotor method A second sealing device 24 is provided at the hollow position of the inner rotor 16 at the end of the flange cover 17; six oil guide holes 11 at the end of the flange cover 17 of the outer rotor are provided.

The position of the shaft disk on the outer rotor of the utility model can be adjusted through the spring bushing, so that the structure meets the needs of the test and research.

Before the utility model is used, the outer end of the flange cover of the outer rotor is first connected with the output shaft of a control motor through the first coupling; The output shafts of the control motors are connected, and the two control motors control the inner and outer rotors to rotate respectively. The two control motors are the driving units of the test device, and the ABB motors are used, the model is QABPIC416 90L, and the rated power is 2.2kw.

The intermediary bearing is a deep groove ball bearing, model 61805. The sealing device forms an oil cavity inside the bearing cover to provide lubrication for the supporting bearing and the intermediary bearing, and the sealing can ensure that the lubricating oil does not enter the cavity formed by the inner and outer rotors. room. The supporting bearing is a deep groove ball bearing, model 61810. Since both the inner and outer rotors are rotating at high speed during the test, the seal between the bearing cover and the outer rotor adopts a skeleton seal, and the sealing material is selected from high temperature resistant and wear resistant materials to ensure the sealing effect.

The method of using the vibration test device of the present utility model to carry out the misalignment test of the shaft coupling is described below in conjunction with the accompanying drawings:

1) First, connect the outer end of the outer rotor flange cover with the output shaft of a control motor through the first coupling, and connect the outer end of the inner rotor with the output shaft of another control motor through the second coupling shaft connected;

2) Start two control motors, adjust the speed of the two control motors, such as 8000r/min, 12000r/min, 15000r/min; use the eddy current sensor to measure the vibration of the inner rotor, outer rotor or shaft disk at different speeds The signal is collected, and the collected vibration signal is recorded;

3) Replace the first coupling and the second coupling with faulty couplings;

4) Start two control motors, and adjust the speed of the two control motors, such as 8000r/min, 12000r/min, 15000r/min; use the eddy current sensor to detect the inner rotor with coupling misalignment fault at different speeds , Outer rotor or shaft disk vibration signals are collected, and the collected fault vibration signals are recorded to complete the test.

Claims (5)

1. A vibration test device for an internal and external rotor system, comprising an internal rotor and an external rotor, characterized in that the internal rotor is arranged inside the external rotor, the internal rotor and the external rotor are connected through an intermediary bearing, and the external rotor is supported by a supporting bearing It is connected with the bearing seat; an inner bearing cover is arranged on the inner side of the bearing seat, and an outer bearing cover with a through hole and an oil chamber is arranged on the outer side of the bearing seat, and the end of the outer rotor is located in the oil chamber; the outer One end of the rotor has a through hole, and the inner rotor at this end is connected to the second coupling through the through hole of the outer rotor and the through hole of the outer bearing cover in turn; the other end of the outer rotor is connected to one end of the flange cover of the outer rotor. The other end of the flange cover of the outer rotor is connected to the first coupling through the through hole of the outer bearing cover; an oil guide hole is provided at the end of the flange cover of the outer rotor connected to the outer rotor, and the oil guide hole One end communicates with the oil chamber, and the other end corresponds to the intermediate bearing; a shaft disk is arranged outside the outer rotor, and the shaft disk is fixed on the outer circle of the outer rotor through a spring sleeve, and the inner rotor and the outer rotor at both ends of the outer rotor A first sealing device is arranged between them; an eddy current sensor is arranged on the inner rotor, the outer rotor or the shaft disk, and the eddy current sensor is connected with the upper computer. 2. A vibration test device for an internal and external rotor system according to claim 1, characterized in that the internal rotor adopts a hollow structure, and a second sealing device is provided at the hollow position of the internal rotor at the flange end of the external rotor. 3. A vibration test device for an inner and outer rotor system according to claim 1, characterized in that the outer rotor and the outer rotor flange cover are connected by screws. 4. A vibration test device for an internal and external rotor system according to claim 1, characterized in that both the inner bearing cover and the outer bearing cover are connected to the bearing housing by screws. 5. A vibration test device for an internal and external rotor system according to claim 1, wherein the number of oil guide holes at the flange cover end of the external rotor is set to six.

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