Brush type sealing friction coefficient experimental device based on multi-head attention mechanism

Abstract

The utility model belongs to the field of aero-engine brush type seal friction coefficient prediction, and particularly relates to a brush type seal friction coefficient experimental device based on a multi-head attention mechanism, which comprises a rectangular cast iron square box, a brush type seal clamp, a servo motor, a torque sensor, a main shaft, a friction turntable, a brush type seal mounting seat and a pull pressure sensor, the rectangular cast iron square box is placed on the horizontal experiment platform; the servo motor is connected with the spindle through the torque sensor and drives the friction turntable to rotate around the spindle; the friction turntable is arranged at the top of the main shaft, the brush type sealing mounting seat is fixed on the side surface of the rectangular cast iron square box and is opposite to the friction turntable, and a brush type sealing clamp for clamping a test piece is arranged on the brush type sealing mounting seat close to the friction turntable; and a pull pressure sensor is arranged on the brush type sealing mounting seat. The device is used for researching the friction and wear characteristics of the brush seal, and the friction and wear characteristics of the brush seal with different structural parameters are tested under different working conditions.

Description

Technical Field

[0001] The utility model belongs to the field of aviation engine brush seal friction coefficient prediction, and particularly relates to a brush seal friction coefficient experimental device based on a multi-head attention mechanism. Background Art

[0002] Brush seals are an advanced, flexible, contact-type dynamic seal structure that plays a key role in preventing leakage of the working medium and reducing energy consumption. As the simplest and most effective alternative to traditional grate seals, brush seals are widely used in high-end turbine machinery such as aircraft engines and gas turbines. However, during operation, the brush seal's bristles are constantly rubbed against the wear-resistant coating on the rotor runway surface, causing the bristles to gradually wear away. This results in reduced sealing performance and service life of the brush seal. Therefore, research on the friction and wear characteristics of brush seals, and analysis of the life degradation process and mechanism of brush seals, are a key area of research and are attracting widespread attention.

[0003] Therefore, this patent proposes a brush seal friction coefficient test device for aviation engine brush seal friction coefficient test. Utility Model Content

[0004] This utility model patent aims to solve the above technical problems and provides an experimental device for predicting the friction coefficient of brush seals of aircraft engines.

[0005] Brush seal technology, as a key contact sealing method, can effectively prevent the leakage of gases, liquids and other substances, and plays an important role in improving the performance of turbine machinery such as aircraft engines and gas turbines.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following specific technical solutions: a brush seal friction coefficient experimental device based on a multi-head attention mechanism, comprising: a rectangular cast iron box, a brush seal fixture, a servo motor, a torque sensor, a spindle, a friction turntable, a brush seal mounting seat and a tension and pressure sensor;

[0007] The rectangular cast iron box is placed vertically on a horizontal experimental platform; the servo motor is connected to the main shaft through a torque sensor, driving the friction turntable to rotate around the main shaft; the friction turntable is arranged on the top of the main shaft, and the friction turntable has multiple steps; the brush seal mounting seat is fixed on the side of the rectangular cast iron box and is arranged opposite to the friction turntable, and the interference amount is set by adjusting the distance between the two; a brush seal fixture for clamping the test piece is installed on the brush seal mounting seat near the friction turntable; a tension and pressure sensor is set on the brush seal mounting seat.

[0008] Furthermore, two tension and pressure sensors are provided on the brush seal mounting seat, which are used to measure the normal pressure and friction force between the brush wire and the friction turntable respectively.

[0009] Furthermore, a cantilever bracket is fixed to the side of the rectangular cast iron box, and an infrared camera is fixed on the cantilever bracket to observe the overall temperature distribution of the target being measured in the experiment through the infrared camera.

[0010] Furthermore, the friction turntable has 15 steps, the radius difference between adjacent steps is 0.05 mm, and the minimum diameter of the friction turntable is 360 mm.

[0011] The utility model can achieve the following technical effects:

[0012] The utility model applies an experimental device to the research on the friction and wear characteristics of brush seals, and implements experiments on the friction and wear characteristics of brush seals with different structural parameters under different working conditions.

[0013] The utility model can directly conduct experiments on brush seal test pieces to obtain the friction force, friction torque, friction coefficient and wear amount thereof, and has certain value for studying the friction and wear performance of brush seals. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Front view of the brush seal friction and wear characteristics experimental device;

[0015] Figure 2 Top view of the experimental device for the friction and wear characteristics of brush seals;

[0016] Figure 3 Brush seal test piece and installation location diagram.

[0017] In the picture:

[0018] 1. Computer; 2. Vibration data acquisition system; 3. Rectangular cast iron box; 4. Friction turntable; 5. Brush seal mounting base; 6. Cantilever bracket; 7. Infrared camera; 8. Brush seal fixture. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not constitute a limitation of the present invention.

[0020] refer to Figure 1-3The experimental device of brush seal friction coefficient of multi-head attention mechanism includes: rectangular cast iron box 3, brush seal fixture 8, servo motor, torque sensor, spindle, friction turntable 4, brush seal mounting base 5 and tension and pressure sensor;

[0021] The rectangular cast iron box 3 is placed vertically on the horizontal experimental platform; the servo motor is connected to the main shaft through the torque sensor, driving the friction turntable 4 to rotate around the main shaft; the friction turntable 4 is arranged on the top of the main shaft, and the friction turntable 4 has multiple steps; the brush seal mounting seat 5 is fixed on the side of the rectangular cast iron box 3 and is arranged opposite to the friction turntable 4, and the interference amount is set by adjusting the distance between the two; a brush seal fixture 8 for clamping the test piece is installed on the brush seal mounting seat 5 near the friction turntable 4; the brush seal fixture 8 clamps the brush wire used for the friction experiment; a tension and pressure sensor is set on the brush seal mounting seat 5.

[0022] Furthermore, two tension and pressure sensors are provided on the brush seal mounting seat 5 for measuring the normal pressure and friction force between the brush wire and the friction turntable 4. The measurement range of the two tension and pressure sensors is 0 to 50 kg.

[0023] A cantilever bracket 6 is fixed to the side of the rectangular cast iron box 3 , and an infrared camera 7 is fixed to the cantilever bracket 6 . The infrared camera 7 is used to observe the overall temperature distribution of the target being measured in the experiment.

[0024] Furthermore, the experimental device also includes a computer 1 and a vibration data acquisition system 2; the vibration data acquisition system 2 is used to collect data information of the experimental device and transmit the data to the computer 1, and the computer 1 is used to calculate and analyze the experimental data and generate experimental data graphs.

[0025] Figure 1 and Figure 2 The front view and top view of the experimental setup designed and built to obtain the dataset are shown respectively. Figure 3 The brush seal test piece used and its installation location are shown. During the test, a servo motor is connected to the spindle via a torque sensor (torque range: 0-20 N·m), which drives the friction disc 4 to rotate around the spindle. The torque sensor measures the friction torque between the brush filaments and the friction disc 4. The servo motor can operate at a maximum speed of 5000 rpm.

[0026] The friction disc 4 is mounted on top of the spindle and has a minimum diameter of 360 mm. It has 15 steps, with a 0.05 mm radius difference between adjacent steps. It serves as the rotor that contacts the brush seal test piece during the experiment. The position of the brush seal mount 5 is adjustable, and the required interference is set by adjusting the gap between the brush seal mount 5 and the friction disc 4. The interference adjustment range is 0 to 0.7 mm.

[0027] The experimental device of this application uses a test data set measured by direct force measurement method. The brush seal friction coefficient is calculated using the positive pressure resultant force and the friction resultant force between the brush filaments and the friction turntable 4 measured during the experiment.

[0028] During the data acquisition tests, the brush seal specimens were tested at three specific speeds: 1000 rpm, 1500 rpm, and 2000 rpm. Four one-hour wear tests were conducted under each test condition. The interference was set to 0.3 mm throughout all tests.

[0029] This test device collects data sets from four tests under three operating conditions. It can directly test the friction force, friction torque, friction coefficient, and wear of brush seal test pieces, providing valuable insights into the friction and wear performance of brush seals.

[0030] During the experiment, the experimental device of this application was first used to measure data through direct measurement and construct a data set; then, position encoding and multi-head attention mechanisms were introduced to analyze the collected data; taking the brush seal friction coefficient as the research object, a data-driven multi-head attention mechanism brush seal friction coefficient prediction model was established; a data set of 4 tests under each of 3 working conditions was collected through the experimental device; and a comparison test was carried out between the established friction coefficient prediction model and the data set obtained based on the experimental device.

[0031] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0032] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Those skilled in the art may make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

[0033] The above specific embodiments of the present invention do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A brush seal friction coefficient experimental device based on a multi-head attention mechanism, characterized in that: include: Rectangular cast iron box (3), brush seal fixture (8), servo motor, torque sensor, main shaft, friction turntable (4), brush seal mounting seat (5) and tension and pressure sensor; The rectangular cast iron box (3) is placed vertically on a horizontal experimental platform; the servo motor is connected to the main shaft through a torque sensor to drive the friction turntable (4) to rotate around the main shaft; the friction turntable (4) is arranged on the top of the main shaft, and the friction turntable (4) has multiple steps; the brush seal mounting seat (5) is fixed on the side of the rectangular cast iron box (3) and is arranged opposite to the friction turntable (4), and the interference amount is set by adjusting the distance between the two; a brush seal fixture (8) for clamping a test piece is installed on the brush seal mounting seat (5) near the friction turntable (4); a tension and pressure sensor is arranged on the brush seal mounting seat (5).

2. The brush seal friction coefficient experimental device based on the multi-head attention mechanism according to claim 1 is characterized in that: Two tension and pressure sensors are provided on the brush seal mounting seat (5), which are used to measure the normal pressure and friction force between the brush filaments and the friction turntable (4), respectively.

3. The brush seal friction coefficient experimental device based on the multi-head attention mechanism according to claim 2 is characterized in that: A cantilever bracket (6) is also fixed to the side of the rectangular cast iron box (3), and an infrared camera (7) is fixed to the cantilever bracket (6). The infrared camera (7) is used to observe the overall temperature distribution of the target being measured in the experiment.

4. The brush seal friction coefficient experimental device based on the multi-head attention mechanism according to claim 1 is characterized in that: The friction rotating disk (4) has 15 steps, the radius difference between adjacent steps is 0.05 mm, and the minimum diameter of the friction rotating disk (4) is 360 mm.

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