Experimental device for detecting rub-impact of rotor and stator

Abstract

The invention discloses an experimental device for detecting rotor and stator rub-impact, which comprises a support frame, a motor, a rotor assembly, an adjustable stator assembly, a high-speed camera and a displacement sensor, and is characterized in that the motor is fixed on the support frame, the motor is connected with the rotor assembly, the adjustable stator assembly is fixed on the support frame, and the adjustable stator assembly surrounds the rotor assembly; the displacement sensor is arranged on the adjustable stator assembly, and the high-speed camera is arranged on the rotor assembly. According to the invention, the adjustable stator assembly for adjusting the gap between the rotor and the stator is used for changing the gap between the rotor and the stator, so that different rotor and stator rub-impact state parameters can be obtained, and the effect of rotor and stator rub-impact phenomenon test is improved.

Description

Technical Field

[0001] The invention relates to an engine strength test technology, in particular to an experimental device for detecting rotor-stator friction. Background Art

[0002] The rotor-stator system is the main mechanical structure in various aircraft engines, drilling machines and other machines. However, due to processing errors, installation errors, thermal expansion and contraction, the rotor deviates from the rotation center and vibrates, which leads to nonlinear resonance and other phenomena caused by the rotor and stator rubbing against each other, and finally leads to mechanical damage and accidents. Experimental simulation of rotor-stator rubbing can help us understand the rubbing phenomenon more clearly. According to the experimental phenomenon, the rotor-stator system can be improved to reduce the losses caused by accidents caused by rotor-stator rubbing.

[0003] At present, in aircraft engines, the performance and thrust-to-weight ratio are improved by reducing the gap between the stators of rotating machinery, which increases the possibility of rotor-stator rubbing accidents, leading to rotor imbalance and shaft breakage, and even causing accidents such as machine locking. In addition, the mechanism of the internal resonance characteristics induced by the friction between the flexible rotor and stator is not yet fully understood. At present, the displacement of the flexible rotor and stator is large, which exceeds the range of the displacement sensor. A new experimental device is urgently needed to study the internal resonance characteristics induced by the friction between the rotor and stator. Summary of the invention

[0004] Purpose of the invention: In view of the above problems, the purpose of the present invention is to provide an experimental device for detecting rotor-stator friction and effectively measuring the rotor-stator axis trajectory.

[0005] Technical solution: An experimental device for detecting rotor-stator friction of the present invention includes: a support frame, a motor, a rotor assembly, an adjustable stator assembly, a high-speed camera and a displacement sensor. The motor is fixed on the support frame, the motor is connected to the rotor assembly, the adjustable stator assembly is fixed on the support frame, the adjustable stator assembly surrounds the rotor assembly, the displacement sensor is arranged on the adjustable stator assembly, and the high-speed camera is arranged on the rotor assembly.

[0006] Further, the rotor assembly includes a first coupling, a first rotating shaft, a second coupling, a second rotating shaft and a chassis, the rotor assembly is placed vertically, the motor is arranged on the top of the support frame, the output shaft of the motor is connected to one end of the first rotating shaft through the first coupling, the other end of the first rotating shaft is connected to one end of the second rotating shaft through the second coupling, the other end of the second rotating shaft is fixed to the chassis, and the high-speed camera is arranged at the bottom of the chassis;

[0007] A partition is arranged in the middle of the support frame, a through hole is arranged on the partition, a bearing is assembled in the through hole, and the first rotating shaft cooperates with the bearing.

[0008] Further, the adjustable stator assembly includes a contact ring and four connecting rods, one end of the connecting rod is connected to the partition plate by bolts;

[0009] The other end of the connecting rod is connected to the contact ring through a spring assembly, and the connection points are evenly distributed around the contact ring;

[0010] Two displacement sensors are fixed on two adjacent connecting rods, and the displacement sensors are used to detect the movement of the adjustable stator assembly in the vertical direction and the horizontal direction.

[0011] Further, the spring assembly includes a spring with a hook at the end, an external hexagonal bolt and an internally threaded tube;

[0012] The end hook of the end spring with a hook is buckled in the contact ring, the non-hook end of the end spring with a hook is welded to the end of the external hexagonal bolt, the outer diameter of the end spring with a hook is smaller than the inner diameter of the internal threaded pipe, the external hexagonal bolt and the internal threaded pipe are movably connected through threads, and the internal threaded pipe is welded to the contact ring.

[0013] Furthermore, the chassis includes a first disc and a second disc, the first disc is arranged above the second disc, the diameter of the first disc is larger than the diameter of the second disc, and the thickness of the first disc is smaller than the thickness of the second disc.

[0014] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0015] The present invention changes the gap between the rotor and the stator through an adjustable stator assembly capable of adjusting the gap between the rotor and the stator, thereby obtaining different rotor-stator rubbing state parameters and improving the effect of performing a rotor-stator rubbing phenomenon test. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The figure is a structural diagram of an experimental device for detecting rotor-stator friction.

[0017] In the figure: 1. motor; 2. bearing; 3. contact ring; 4. high-speed camera; 5. output shaft; 6. first coupling; 7. first rotating shaft; 8. second coupling; 9. connecting rod; 10. chassis. DETAILED DESCRIPTION

[0018] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0019] like Figure 1 As shown, an experimental device for detecting rotor-stator friction described in this embodiment includes: a support frame, a motor 1, a rotor assembly, an adjustable stator assembly, a high-speed camera 4 and a displacement sensor, the motor 1 is fixed on the support frame, the motor 1 is connected to the rotor assembly, the adjustable stator assembly is fixed on the support frame, the adjustable stator assembly surrounds the rotor assembly, the displacement sensor is arranged on the adjustable stator assembly, and the high-speed camera 4 is arranged on the rotor assembly.

[0020] Furthermore, the rotor assembly includes a first coupling 6, a first rotating shaft 7, a second coupling 8, a second rotating shaft and a chassis 10. The rotor assembly is placed vertically, the motor 1 is arranged on the top of the support frame, the output shaft 5 of the motor is connected to one end of the first rotating shaft 7 through the first coupling 6, the other end of the first rotating shaft 7 is connected to one end of the second rotating shaft through the second coupling 8, and the other end of the second rotating shaft is fixed to the chassis 10. The high-speed camera 4 is arranged at the bottom of the chassis 10, and the rotor vortex is tested by the high-speed camera.

[0021] A partition is arranged in the middle of the support frame, a through hole is arranged on the partition, a bearing 2 is assembled in the through hole, and the first rotating shaft 7 cooperates with the bearing 2.

[0022] Furthermore, the adjustable stator assembly includes a contact ring 3 and four connecting rods 9, one end of the connecting rod 9 is connected to the partition through a bolt; the other end of the connecting rod 9 is connected to the contact ring 3 through a spring assembly, and the connection points are evenly distributed around the contact ring 3.

[0023] The contact ring can be set to a variety of diameter types. By replacing contact rings of different diameters, the gap between the rotor and the stator can be adjusted, thereby changing the gap between the rotor and the stator.

[0024] Two displacement sensors are fixed on two adjacent connecting rods 9, and the two displacement sensors are spaced 90 degrees apart. The displacement sensors are used to detect the movement of the adjustable stator assembly in the vertical direction and the horizontal direction.

[0025] Further, the spring assembly includes a spring with a hook at the end, an external hexagonal bolt and an internally threaded tube;

[0026] The end hook of the end spring with a hook is buckled in the contact ring, the non-hook end of the end spring with a hook is welded to the end of the external hexagonal bolt, the outer diameter of the end spring with a hook is smaller than the inner diameter of the internal threaded pipe, the external hexagonal bolt and the internal threaded pipe are movably connected through threads, and the internal threaded pipe is welded to the contact ring.

[0027] Furthermore, the chassis 10 includes a first disc and a second disc, the first disc is arranged above the second disc, the diameter of the first disc is larger than the diameter of the second disc, and the thickness of the first disc is smaller than the thickness of the second disc.

[0028] In this example, the output shaft is driven to rotate by starting the motor, and then the rotor assembly is driven to rotate by the output shaft. A high-speed camera is used to capture images of the rotor assembly and the adjustable stator assembly during movement, and non-contact technology is used to collect motion data; a displacement sensor is used to detect the vertical and horizontal movement of the stator during the movement of the rotor assembly. Image processing tools such as MATLAB are then used for data processing to understand the dynamic properties involved. Using the data collected by the experimental device for detecting rotor-stator friction described in this example, as well as the bifurcation diagrams, spectral intensity diagrams, and orbital diagrams captured during rotation and stillness, the mechanism of the internal resonance characteristics induced by flexible rotor-stator friction is studied.

Claims

1. An experimental device for detecting rotor-stator friction, characterized in that: include: A support frame, a motor, a rotor assembly, an adjustable stator assembly, a high-speed camera and a displacement sensor. The motor is fixed on the support frame, the motor is connected to the rotor assembly, the adjustable stator assembly is fixed on the support frame, the adjustable stator assembly surrounds the rotor assembly, the displacement sensor is arranged on the adjustable stator assembly, and the high-speed camera is arranged on the rotor assembly.

2. The experimental device for detecting rotor-stator friction according to claim 1, characterized in that: The rotor assembly includes a first coupling, a first rotating shaft, a second coupling, a second rotating shaft and a chassis. The rotor assembly is placed vertically, the motor is arranged on the top of the support frame, the output shaft of the motor is connected to one end of the first rotating shaft through the first coupling, the other end of the first rotating shaft is connected to one end of the second rotating shaft through the second coupling, the other end of the second rotating shaft is fixed to the chassis, and the high-speed camera is arranged at the bottom of the chassis; A partition is arranged in the middle of the support frame, a through hole is arranged on the partition, a bearing is assembled in the through hole, and the first rotating shaft cooperates with the bearing.

3. The experimental device for detecting rotor-stator friction according to claim 2 is characterized in that: The adjustable stator assembly includes a contact ring and four connecting rods, one end of which is connected to the partition plate by bolts; The other end of the connecting rod is connected to the contact ring through a spring assembly, and the connection points are evenly distributed around the contact ring; Two displacement sensors are fixed on two adjacent connecting rods, and the displacement sensors are used to detect the movement of the adjustable stator assembly in the vertical direction and the horizontal direction.

4. The experimental device for detecting rotor-stator friction according to claim 3 is characterized in that: The spring assembly includes a spring with a hook at the end, an external hexagonal bolt and an internal threaded pipe; The end hook of the end spring with a hook is buckled in the contact ring, the non-hook end of the end spring with a hook is welded to the end of the external hexagonal bolt, the outer diameter of the end spring with a hook is smaller than the inner diameter of the internal threaded pipe, the external hexagonal bolt and the internal threaded pipe are movably connected through threads, and the internal threaded pipe is welded to the contact ring.

5. The experimental device for detecting rotor-stator friction according to claim 2, characterized in that: The bottom plate comprises a first disc and a second disc, wherein the first disc is arranged above the second disc, the diameter of the first disc is larger than the diameter of the second disc, and the thickness of the first disc is smaller than the thickness of the second disc.

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