An electric component comprehensive test bench for an auxiliary power unit of an airplane

Abstract

The utility model relates to the technical field of aircraft auxiliary power system test equipment, especially to a kind of aircraft auxiliary power device electrical component comprehensive test board, it includes gas simulation mechanism, liquid simulation mechanism and temperature test mechanism in the table body;Gas simulation mechanism includes low-pressure gas line, negative pressure gas line and high-pressure gas line simulation different gas environment;Liquid simulation mechanism includes pressure oil tank and the pressure oil pump of the pressure oil path of multiple pieces of output end being equipped;The two output ends of pressure oil path, one is communicated with oil tank and is equipped with pressure regulating structure, another is connected with measured instrument.The utility model provides aircraft auxiliary power device electrical component comprehensive test board, can simulate its working condition according to actual work demand and the test condition of measured instrument, to improve the accuracy of test work, need not frequently replace test tool and test environment, reduce the workload and work cost of test work.

Description

Technical Field

[0001] This utility model relates to the technical field of aircraft auxiliary power system testing equipment, and in particular to a comprehensive testing bench for electrical components of aircraft auxiliary power units. Background Technology

[0002] As a core component in aircraft operation, the auxiliary power unit (APU) typically requires numerous electrical instruments to monitor parameters such as pressure and flow rate of the internal media to ensure stable operation. However, due to differences in instrument manufacturers, models, and operating environments, the interfaces and testing requirements vary. Current technology requires individual simulation of the operating environment and the use of appropriate testing tools for each instrument during testing, resulting in time-consuming, labor-intensive, and costly testing. Therefore, to address these shortcomings, a comprehensive test bench for the electrical components of the aircraft APU is proposed. Summary of the Invention

[0003] The purpose of this invention is to provide a comprehensive test bench for electrical components of an aircraft auxiliary power unit, in order to overcome the shortcomings of the existing technology, which requires separate simulation of the operating environment for each instrument and the use of corresponding testing tools when testing the various electrical instrument components in the aircraft auxiliary power unit, resulting in long testing time, large workload, and high cost.

[0004] To achieve the above objectives, this utility model provides a comprehensive test bench for electrical components of an aircraft auxiliary power unit, comprising: The platform includes a gas simulation mechanism, a liquid simulation mechanism, and a temperature testing mechanism. The gas simulation mechanism comprises a low-pressure gas line, a negative-pressure gas line, and a high-pressure gas line. The input ends of these three lines are connected to a gas source. Each of the three lines contains a vacuum generator, a low-pressure booster cylinder, and a high-pressure booster cylinder, respectively. The output ends of the vacuum generator, the low-pressure booster cylinder, and the high-pressure booster cylinder are respectively equipped with a vacuum storage tank, a low-pressure storage tank, and a high-pressure storage tank. The output ends of the low-pressure gas line, the negative-pressure gas line, and the high-pressure gas line are connected to the instrument under test via connectors. The liquid simulation mechanism includes a pressure oil tank and a pressure oil pump. The input end of the pressure oil pump is connected to the output end of the pressure oil tank, and the output end has multiple pressure oil circuits. Each pressure oil circuit has two output ends: one output end is connected to the oil tank and has a pressure regulating structure, and the other output end is connected to the instrument under test. The temperature testing mechanism includes a constant temperature chamber installed within the platform.

[0005] Preferably, the output ends of the low-pressure gas line and the negative-pressure gas line are equipped with a selection valve, the output end of the selection valve is equipped with a vacuum connector and connected to the instrument under test, and the output ends of the low-pressure gas line and the negative-pressure gas line are connected to the output end of the selection valve; the output end of the high-pressure gas line is equipped with a high-pressure connector and connected to the instrument under test.

[0006] Preferably, the test platform includes a pneumatic test area and a hydraulic test area, each of which is equipped with an instrument panel and a connection chamber, with the instrument under test installed in the connection chamber.

[0007] Preferably, each of the input terminals of the low-pressure gas line, the negative-pressure gas line, and the high-pressure gas line is equipped with a switching valve; a gas pressure gauge is provided before both the vacuum connector and the high-pressure connector, and the output terminal of the gas pressure gauge is installed on the instrument panel of the pneumatic test area.

[0008] Preferably, the output ends of the selector valve and the high-pressure gas pipeline are respectively provided with multiple gas pressure pipelines, and the vacuum connector and the high-pressure connector are installed at the output ends of the gas pressure pipelines.

[0009] Preferably, the pressure oil circuit includes a main oil circuit and a secondary oil circuit, with a main oil circuit pressure gauge and a secondary oil circuit pressure gauge respectively installed between the main oil circuit and the secondary oil circuit, and a shut-off valve at each end of the main oil circuit pressure gauge and the secondary oil circuit pressure gauge; the input end and output end of the main oil circuit are respectively equipped with a main oil circuit inlet pressure gauge and an output pressure gauge; the output end of the secondary oil circuit is equipped with a secondary oil circuit output pressure gauge.

[0010] Preferably, the pressure regulating structure includes a main pipeline and a secondary pipeline connected in parallel, and both the output ends of the secondary pipeline and the main pipeline are provided with output shut-off valves between them and the pressure oil tank.

[0011] Preferably, the output end of the pressure oil circuit connected to the instrument under test is provided with an oil pipeline assembly, the oil pipeline assembly includes multiple output oil pipelines connected in parallel, the output end of each output oil pipeline is provided with a transition joint, the transition joint is connected to the instrument under test; each output oil pipeline is provided with a pipeline valve.

[0012] Preferably, the front end of the pressure oil pump is provided with a pneumatic motor, and the output end of the pneumatic motor is provided with a coupling; one end of the coupling is connected to the output end of the pneumatic motor, and the other end is connected to the front end of the pressure oil pump, and the output end of the pressure oil pump is provided with a flow meter.

[0013] Preferably, the platform body is provided with a toolbox, and the toolbox is provided with a top cover.

[0014] The integrated test bench for electrical components of an aircraft auxiliary power unit provided by this utility model has the following beneficial effects: The integrated test bench for electrical components of aircraft auxiliary power units provided by this utility model can simulate the working conditions of the instrument under test in a targeted manner according to actual working needs and the test conditions of the instrument under test through a gas simulation mechanism, a liquid simulation mechanism, and a temperature test mechanism. By simulating the environment from three aspects of gas conditions, liquid conditions, and temperature conditions simultaneously through the gas simulation mechanism, liquid simulation mechanism, and temperature test mechanism, the accuracy of the test work is improved, and the workload and cost of the test work are reduced without the need for frequent changes of test tools and test environment. Attached Figure Description

[0015] Figure 1 Structural diagram of an integrated test bench for electrical components of an aircraft auxiliary power unit; Figure 2 Schematic diagram of the gas simulation mechanism for the integrated test bench of electrical components of aircraft auxiliary power unit; Figure 3 Schematic diagram of the liquid simulation mechanism for the integrated test bench of electrical components of aircraft auxiliary power unit; Figure 4 Liquid simulation mechanism structure for integrated test bench of electrical components of aircraft auxiliary power unit Figure 1 ; Figure 5 This is a connection diagram of the pressure oil pump in the liquid simulation mechanism of the integrated test bench for electrical components of aircraft auxiliary power units.

[0016] Legend: 1. Platform; 2. Vacuum generator; 3. Low-pressure booster cylinder; 4. High-pressure booster cylinder; 5. Vacuum storage tank; 6. Low-pressure storage tank; 7. High-pressure storage tank; 8. Pressure oil tank; 9. Pressure oil pump; 10. Selector valve; 11. Vacuum connector; 12. High-pressure connector; 13. Gas pressure gauge; 14. Main oil circuit pressure gauge; 15. Secondary oil circuit pressure gauge; 16. Toolbox; 17. Top cover; 18. Pneumatic motor; 19. Coupling; 20. Flow meter. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] like Figure 1-5As shown, this utility model provides a comprehensive test bench for electrical components of an aircraft auxiliary power unit, comprising: a bench body 1, which houses a gas simulation mechanism, a liquid simulation mechanism, and a temperature testing mechanism. The bench body 1 serves as the main body of the device, used to mount other components to form a complete unit, providing workspace for subsequent testing and storing various tools needed for testing, reducing preparation time and saving time costs. The gas simulation mechanism, liquid simulation mechanism, and temperature testing mechanism are used to simulate the gas, liquid, and temperature conditions during the actual operation of the tested electrical components, thereby simulating real-world working conditions, measuring the performance of the tested electrical components during actual operation, and improving the accuracy of test results. By installing the gas simulation mechanism, liquid simulation mechanism, and temperature testing mechanism on the bench body 1, the entire testing process can be completed through the bench body 1 during operation. Different testing tools do not need to be changed depending on the electrical component being tested, reducing workload and simplifying the testing process, saving manpower and time costs. Furthermore, it eliminates the need for measurements using prescribed testing instruments, saving significant economic costs.

[0019] In this invention, the gas simulation mechanism includes a low-pressure gas line, a negative-pressure gas line, and a high-pressure gas line. The input ends of the three lines are connected to a gas source. Each of the three lines contains a vacuum generator 2, a low-pressure booster cylinder 3, and a high-pressure booster cylinder 4, respectively. The output ends of the vacuum generator 2, the low-pressure booster cylinder 3, and the high-pressure booster cylinder 4 are respectively equipped with a vacuum storage tank 5, a low-pressure storage tank 6, and a high-pressure storage tank 7. The output ends of the low-pressure gas line, the negative-pressure gas line, and the high-pressure gas line are equipped with connectors to connect to the instrument under test. During operation, the low-pressure gas line, the negative-pressure gas line, and the high-pressure gas line are used to simulate the low-pressure, negative-pressure, and high-pressure gas pressure environments during the operation of electrical components, respectively. During operation, the operator connects the electrical component under test to one of the three gas lines according to the actual operating state of the component. After creating a gas pressure and flow environment at both ends of the component that matches the actual operating conditions, the reading of the electrical component is read and compared with the actual output gas conditions to determine the accuracy of the electrical component's operation. Using a gas source as the power source for the three circuits effectively reduces the testing cost of the device compared to electric methods. Vacuum generator 2 is typically a jet vacuum pump, which uses gas from the gas source to drive the gas at the output end to create a vacuum environment. Low-pressure booster cylinder 3 and high-pressure booster cylinder 4 pressurize the gas output from the gas source to simulate the high-pressure and low-pressure gas environments encountered during the operation of electrical components, respectively. The output pressure of low-pressure booster pump 3 does not exceed 1.6 MPa, and the output pressure of high-pressure booster pump 4 does not exceed 16 MPa. Vacuum storage tank 5, low-pressure storage tank 6, and high-pressure storage tank 7 are used to stabilize the pressure in the three circuits. During operation, the pressure in the three storage tanks is the same as the output pressure of the pressure output device on the corresponding circuit. If pipeline leaks or other problems cause pressure changes, the pressure in the storage tanks acts as an auxiliary pressure source to slow down the rate of pressure change in the pipeline, providing response time for pressure recovery and handling, and preventing sudden pressure drops that could lead to test failure.

[0020] During normal operation, it is usually only necessary to simulate gas pressure and flow rate and maintain the current pressure stability. Under good airtightness, after the operator connects the circuit to the component under test and forms a stable gas pressure, the vacuum generator 2, low-pressure booster cylinder 3 and high-pressure booster cylinder 4 can be turned off. At this time, under the action of the three gas storage tanks, the pressure change in the equipment is very slow. The operator only needs to restart the vacuum generator 2, low-pressure booster cylinder 3 or high-pressure booster cylinder 4 to replenish the corresponding gas storage tank after the pressure change in the equipment is large, or perform replenishment work periodically to maintain the gas pressure stability during the operation of the device and reduce the energy consumption during the operation of the device.

[0021] The output ends of the low-pressure gas line and the negative-pressure gas line are equipped with selector valves 10. The output end of the selector valve is equipped with a vacuum connector 11 connected to the instrument under test. The output ends of the low-pressure gas line and the negative-pressure gas line are connected to the output end of the selector valve 10. The output end of the high-pressure gas line is equipped with a high-pressure connector 12 connected to the instrument under test. During operation, the low-pressure gas and negative-pressure gas detection environments occur less frequently than the high-pressure gas environments. Therefore, the output ends of the negative-pressure gas line and the low-pressure gas line are usually connected through a selector valve 19. During operation, the working state of the selector valve 10 is switched according to work requirements to select either the low-pressure gas line or the negative-pressure gas line to connect to the output end of the selector valve 10. The vacuum connector 11 and the high-pressure connector 12 are used to connect the pipeline to the electronic component under test. In actual operation, since different components under test have different interface models, the vacuum connector 11 and the high-pressure connector 12 are detachably connected to the pipeline. Operators only need to change the corresponding connector model according to work requirements.

[0022] The test platform 1 includes a pneumatic testing area and a hydraulic testing area. Each testing area has an instrument panel and a connection chamber, with the instrument under test installed in the connection chamber. The connection chamber is used to house the component under test during testing. After being connected to the pipeline inside the test platform 1, the component under test is placed in the corresponding connection chamber to avoid the influence of the surrounding environment on the measurement results. The instrument panel is used to install instruments used to monitor the medium and simulate environmental parameters during testing, such as pressure gauges, flow meters, voltmeters, and thermometers. The operator can adjust the types of instruments on the instrument panel according to actual work needs. For easy reading, a reader is provided on the surface of the instrument panel. The input terminal of the reader is connected to the component under test installed in the connection chamber via a signal line. At this time, the operator can directly monitor the reading of the component under test in real time on the instrument panel, reducing the workload and simplifying the workflow during testing.

[0023] Each of the low-pressure gas line, negative-pressure gas line, and high-pressure gas line has a switching valve at its input end. A gas pressure gauge 13 is installed before both the vacuum connector 11 and the high-pressure connector 12, and the output of the gas pressure gauge 13 is mounted on the instrument panel in the pneumatic testing area. The switching valves control the gas flow in each line; changing the switching valve's on / off state changes whether the corresponding line is operational. The gas pressure gauge 13 monitors gas pressure changes in each line, allowing operators to adjust the output gas pressure based on the gauge readings and work schedule. For ease of operation, the control terminals of the switching valves and the display terminals of the gas pressure gauge 13 are typically mounted on the instrument panel.

[0024] It should be noted that the output ends of the selector valve 10 and the high-pressure gas pipeline are respectively equipped with multiple gas pressure pipelines, and the vacuum connector 11 and high-pressure connector 12 are installed at the output ends of the gas pressure pipelines. In actual operation, some special electrical components may require connectors of specific models and shapes that cannot be connected to the pipeline via detachable connections. In such cases, multiple gas pressure pipelines can be prepared, and a corresponding vacuum connector 11 or high-pressure connector 12 can be installed at the end of each pipeline. During testing, only the corresponding vacuum connector 11 or high-pressure connector 12 needs to be selected and connected to the component under test. Additionally, each gas pressure pipeline is equipped with a switch valve. The pipeline's connectivity is adjusted using these valves. During testing, the switch valve corresponding to the required connector is opened, while the others are closed to prevent gas waste during operation.

[0025] like Figure 3-5 As shown, the liquid simulation mechanism includes a pressure oil tank 8 and a pressure oil pump 9. The input end of the pressure oil pump 9 is connected to the output end of the pressure oil tank 8, and the output end has multiple pressure oil circuits. Each pressure oil circuit has two output ends, one of which is connected to the oil tank and has a pressure regulating structure, and the other output end is connected to the instrument under test. The pressure oil tank is used to store pressure oil. After the pressure oil in the pressure oil tank 8 is pressurized and output by the pressure oil pump 9, a stable oil pressure is formed in the pipeline. After connecting the pressure oil circuit to the component being measured, starting the pressure oil pump 9 can create a liquid pressure environment around the component under test that is the same as the simulated working environment. After one output end of the pressure oil circuit is connected to the component under test, the other output end is connected to the pressure oil tank 8. The pressure in the corresponding pressure oil circuit can be adjusted by adjusting the opening of the output end connected to the pressure oil tank 8. For example, if the oil pressure in a pressure oil circuit is 1 MPa, one output terminal is connected to the component under test, and the other output terminal is connected to the pressure oil tank 8 and is in the open state. A portion of the oil enters the pressure oil tank 8. If the output flow rate of the pressure oil pump 9 is greater than the flow rate returning from the output terminal to the pressure oil tank 8, the pressure in the pressure oil circuit will gradually increase and the flow rate returning to the pressure oil tank 8 will gradually increase until the input and output flow rates in the pressure oil circuit are equal. The larger the opening of the output terminal pipe connected to the pressure oil tank 8, the lower the oil pressure in the pressure oil circuit when the balance is achieved.

[0026] The pressure oil circuit includes a main oil circuit and a secondary oil circuit. A main oil circuit pressure gauge 14 and a secondary oil circuit pressure gauge 15 are respectively installed between the main and secondary oil circuits. Each of the main and secondary oil circuit pressure gauges has a shut-off valve at both ends. The main oil circuit has an inlet and an outlet pressure gauge at its input and output ends, respectively. The secondary oil circuit has an output pressure gauge at its output end. The inlet pressure gauge of the main oil circuit is connected to the main pipeline at the output end of the pressure oil pump 9; therefore, the reading of the inlet pressure gauge of the main oil circuit is the output oil pressure of the pressure oil pump 9. During operation, the pressure oil circuit can serve not only as a channel for pressure oil to enter the tested component, but also as a channel for pressure oil to return to the pressure oil tank 8 after passing through the tested component. After connecting the output end of the pressure oil circuit to the output end of the tested component, the shut-off valve in the pressure oil circuit is closed, while maintaining communication between the two output ends. At this time, the oil output by the pressure oil pump 9 cannot enter the pressure oil circuit. The pressure oil input to the tested component flows from the output end of the tested component into the output end of the pressure oil circuit, and then flows into the pressure oil tank 8 from the other output end of the corresponding pressure oil circuit. At this time, the output oil pressure of the tested component can be changed by adjusting the pressure structure. The output oil pressure can be measured by simply opening the shut-off valve after the secondary oil circuit pressure gauge 15 or the main oil circuit pressure gauge 14.

[0027] It should be noted that the pressure regulating structure includes a main pipe and a secondary pipe connected in parallel. Both the output ends of the secondary pipe and the main pipe are equipped with output shut-off valves between them and the pressure oil tank 8. Both the main pipe and the secondary pipe are used to guide the pressure oil into the pressure oil tank 8. During adjustment, only the opening of the main pipe can be adjusted to regulate the oil pressure in the corresponding pressure circuit, with the secondary pipe serving as a backup pipe; alternatively, the openings of both the main pipe and the secondary pipe can be adjusted simultaneously to achieve fine adjustment of the oil pressure within the pressure circuit.

[0028] In addition, the output end of the pressure oil circuit connected to the instrument under test is equipped with an oil pipeline assembly. This assembly includes multiple parallel output oil pipelines, each with a transition joint at its output end, which connects to the instrument under test. Each output oil pipeline also has a pipeline valve. Similar to the gas simulation mechanism, due to the special interface types of some tested components, specialized transition joints are required for connection to the pressure oil circuit. Therefore, multiple parallel output oil pipelines are pre-installed at the output end of the pressure oil circuit, with different types of transition joints at their ends. During operation, the corresponding transition joint is connected to the tested component to perform the test. The pipeline valve can be used to close the output oil pipelines not involved in the test, preventing waste of pressure oil during operation.

[0029] The pressure oil pump 9 has a pneumatic motor 18 at its front end, and a coupling 19 at its output end. One end of the coupling 19 is connected to the output end of the pneumatic motor 18, and the other end is connected to the front end of the pressure oil pump 9. Driving the pressure oil pump 9 with the pneumatic motor 18 consumes less energy than electric drive. Therefore, an additional pipe can be connected from the gas source of the gas simulation mechanism to the output end of the pneumatic motor 18, allowing the steam in the gas source to serve as the power source for the pneumatic motor 18. A flow meter 20 is installed at the output end of the pressure oil pump 9 to monitor the flow rate of the oil output by the pressure oil pump 9.

[0030] The temperature testing mechanism includes a constant temperature chamber installed inside the test platform 1. The constant temperature chamber is used to simulate the temperature environment during the instrument's operation. For components under test with special operating temperatures, operators can remove the output ends of the pressure oil lines and gas lines used in the testing process from the test platform 1 and the connecting chamber, connect them to the component under test, and place them together with the component under test into the constant temperature chamber. Then, the temperature of the constant temperature chamber is adjusted to be the same as the operating temperature of the component under test, so that the testing can be carried out in a temperature environment identical to the actual working environment.

[0031] For ease of operation, a toolbox 16 is provided inside the platform 1, and the toolbox 16 has a top cover 17. During testing, various disassembly and assembly tools are required to connect the tested component to the various connectors within the device. Workers can store the necessary tools in the toolbox 16, and simply retrieve the appropriate tool when needed. The top cover 17 seals the top of the toolbox 16, preventing dust and splashed liquids from entering and damaging or contaminating the tools, thus improving the safety of the device.

[0032] Combination Figures 1 to 5 The following describes in detail the operating steps of this integrated test bench for the electrical components of an aircraft auxiliary power unit: Step 1: Connect the component under test (DUT) to the piping inside the test chamber according to its operating environment. The environmental requirements of the DUT and the object being measured vary. Typically, during operation, a gas simulation mechanism or a liquid simulation mechanism is connected to the DUT based on the object being measured. If the DUT has temperature requirements, it is placed inside the constant temperature chamber after connection.

[0033] Step 2: Start the gas simulation mechanism, liquid simulation mechanism, and temperature testing mechanism to simulate the actual working environment of the component under test. Start the pressure generating device in the gas simulation mechanism or the pressure oil pump in the liquid simulation mechanism according to the connected pipelines and the working environment to be simulated. Then, start the constant temperature chamber as needed to stabilize the liquid pressure, gas pressure, and temperature at the target values.

[0034] Step 3: Observe the simulated environmental pressure and temperature under stable conditions using the instruments on the dashboard, and compare the two to determine the performance of the tested component. The closer the measured value of the tested component is to the actual simulated value, the better the working performance of the tested component.

[0035] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A comprehensive test bench for electrical components of an aircraft auxiliary power unit, characterized in that, include: The platform (1) is equipped with a gas simulation mechanism, a liquid simulation mechanism and a temperature testing mechanism; The gas simulation mechanism includes a low-pressure gas line, a negative-pressure gas line, and a high-pressure gas line. The input ends of the three lines are connected to the gas source. The three lines are respectively equipped with a vacuum generator (2), a low-pressure booster cylinder (3), and a high-pressure booster cylinder (4). The output ends of the vacuum generator (2), the low-pressure booster cylinder (3), and the high-pressure booster cylinder (4) are respectively equipped with a vacuum storage tank (5), a low-pressure storage tank (6), and a high-pressure storage tank (7). The output ends of the low-pressure gas line, the negative-pressure gas line, and the high-pressure gas line are equipped with connecting joints to connect to the instrument under test. The liquid simulation mechanism includes a pressure oil tank (8) and a pressure oil pump (9). The input end of the pressure oil pump (9) is connected to the output end of the pressure oil tank (8). The output end is equipped with multiple pressure oil circuits. Each pressure oil circuit is equipped with two output ends. One output end is connected to the oil tank and is equipped with a pressure regulating structure. The other output end is connected to the instrument under test. The temperature testing mechanism includes a constant temperature chamber installed in the platform (1).

2. The integrated test bench for electrical components of aircraft auxiliary power units according to claim 1, characterized in that, The output ends of the low-pressure gas line and the negative-pressure gas line are equipped with a selection valve (10), and the output end of the selection valve is equipped with a vacuum connector (11) connected to the instrument under test. The output ends of the low-pressure gas line and the negative-pressure gas line are connected to the output end of the selection valve (10); the output end of the high-pressure gas line is equipped with a high-pressure connector (12) connected to the instrument under test.

3. The integrated test bench for electrical components of aircraft auxiliary power units according to claim 2, characterized in that, The platform (1) includes a pneumatic test area and a hydraulic test area. Each of the pneumatic test area and the hydraulic test area is provided with an instrument panel and a connection chamber, and the instrument under test is installed in the connection chamber.

4. The integrated test bench for electrical components of aircraft auxiliary power units according to claim 3, characterized in that, Each of the input terminals of the low-pressure gas line, the negative-pressure gas line, and the high-pressure gas line is equipped with a switching valve; a gas pressure gauge (13) is provided in front of the vacuum connector (11) and the high-pressure connector (12), and the output terminal of the gas pressure gauge (13) is installed on the instrument panel of the pneumatic test area.

5. The integrated test bench for electrical components of aircraft auxiliary power units according to claim 4, characterized in that, The output ends of the selector valve (10) and the high-pressure gas pipeline are respectively provided with multiple gas pressure pipelines, and the vacuum connector (11) and the high-pressure connector (12) are installed at the output ends of the gas pressure pipelines.

6. The integrated test bench for electrical components of aircraft auxiliary power units according to claim 1, characterized in that, The pressure oil circuit includes a main oil circuit and a secondary oil circuit. A main oil circuit pressure gauge (14) and a secondary oil circuit pressure gauge (15) are respectively installed between the main oil circuit and the secondary oil circuit. A shut-off valve is provided at both ends of the main oil circuit pressure gauge (14) and the secondary oil circuit pressure gauge (15). The input end and output end of the main oil circuit are respectively provided with a main oil circuit inlet pressure gauge and an output pressure gauge. The output end of the secondary oil circuit is provided with a secondary oil circuit output pressure gauge.

7. The integrated test bench for electrical components of aircraft auxiliary power units according to claim 2, characterized in that, The pressure regulating structure includes a main pipeline and a secondary pipeline connected in parallel. Both the output ends of the secondary pipeline and the main pipeline are equipped with output shut-off valves between them and the pressure oil tank (8).

8. The integrated test bench for electrical components of aircraft auxiliary power units according to claim 6, characterized in that, The output end of the pressure oil circuit connected to the instrument under test is provided with an oil pipeline assembly. The oil pipeline assembly includes multiple output oil pipelines connected in parallel. The output end of each output oil pipeline is provided with a transition joint, which is connected to the instrument under test. Each output oil pipeline is provided with a pipeline valve.

9. The integrated test bench for electrical components of aircraft auxiliary power units according to claim 8, characterized in that, The front end of the pressure oil pump (9) is provided with a pneumatic motor (18), and the output end of the pneumatic motor (18) is provided with a coupling (19); one end of the coupling (19) is connected to the output end of the pneumatic motor (18), and the other end is connected to the front end of the pressure oil pump (9); the output end of the pressure oil pump (9) is provided with a flow meter.

10. The integrated test bench for electrical components of aircraft auxiliary power units according to claim 1, characterized in that, The platform (1) is equipped with a toolbox (16), and the toolbox (16) is equipped with a top cover (17).

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