Aero-engine lubricating oil pressure low sensor testing device and method

Abstract

The invention relates to the technical field of aero-engines, in particular to an aero-engine lubricating oil pressure low sensor testing device and method.The aero-engine lubricating oil pressure low sensor testing device comprises an equipment shell which is provided with a testing and measuring assembly, a part installing assembly, an air pressure source air supply assembly, a serial port relay, a lubricating oil pressure low sensor plug and an adapter plug; the part installation assembly comprises a power switch, an indicator lamp, a device nameplate, an access plug, a part installation area, a metal high-pressure pipeline, a pressure gauge, a first stop valve, a second stop valve, a third stop valve and an exhaust valve. The test and measurement assembly, the part installation assembly and the air pressure source air supply assembly are highly integrated, so that the cost is low, the use is more convenient, the test data and the test result can be clearly and accurately recorded according to the standard automatic test process, the connection process is simplified by designing the lubricating oil pressure low sensor plug and the adapter plug, and the test efficiency is improved. And the stability and the accuracy of the test are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of aero-engines, and in particular to a device and method for testing a low lubricating oil pressure sensor for an aero-engine. Background Art

[0002] At present, civil aviation engines mainly use turbofan engines, and the lubricating oil system is one of the key systems of turbofan engines, which mainly plays the role of lubrication, cleaning, cooling, anti-corrosion, vibration reduction and buffering. Because the lubricating oil system plays a key role in various engine systems, once the lubricating oil system works abnormally, it will cause irreversible damage to the engine's operating parts at the least, and will cause the engine to stop in the air, which is usually called air stop, posing a great threat to flight safety. Therefore, aircraft engines are designed and installed with engine lubricating oil low pressure sensing systems to monitor whether the engine lubricating oil system is working normally.

[0003] Take the V2500 engine oil low pressure sensing system as an example, it is composed of oil low pressure sensor, related pipelines, and related warning computers. The oil low pressure sensor is a separate sensor set up independently of the oil pressure indication system, which is used to monitor the working pressure of the oil system. At the same time, it is also used on the ground to provide signals representing the engine operating status to various aircraft systems. Therefore, the test of the oil low pressure signal sensor is particularly important;

[0004] Existing testing technologies are mainly divided into the following three types:

[0005] 1. Test during aircraft engine operation: The low oil pressure sensor is installed on an aircraft engine of the corresponding model, and the engine is tested as a whole. The performance of the low oil pressure sensor is judged by the test data and visual observation.

[0006] 2. External test: The low oil pressure sensor is sent to a foreign manufacturer for testing; the test process and test parameters are unknown;

[0007] 3. Manual testing: Manual testing is performed manually according to the testing process provided in the manual.

[0008] However, when the above technology is actually used:

[0009] The cost of running the aircraft engine test is high and it is highly dependent on the test bench and the aircraft engine;

[0010] For outsourced testing, the testing process and parameters are unclear and lack transparency;

[0011] Manual testing has the problems of high testing pressure, high security risks, and low integration and automation levels. Summary of the invention

[0012] The purpose of the present invention is to provide an aircraft engine low oil pressure sensor testing device and method to solve the problems of high cost, unclear parameters and lack of transparency, high test pressure, high safety risks, and low integration and automation.

[0013] To achieve the above-mentioned object, the present invention provides the following technical solutions: an aircraft engine low oil pressure sensor test device, comprising: a device housing, on which a test and measurement assembly, a parts installation assembly, an air pressure source air supply assembly, a serial port relay, a low oil pressure sensor plug and a transfer plug are arranged;

[0014] The test and measurement components include an embedded industrial all-in-one computer, a desktop digital multimeter, a panel megohmmeter and a desktop DC power supply;

[0015] The parts installation assembly includes a power switch, an indicator light, a device nameplate, an access plug, a parts installation area, a metal high-pressure pipeline, a pressure gauge, a first stop valve, a second stop valve, a third stop valve and an exhaust valve;

[0016] The air pressure source supply assembly comprises a mounting platform, and a manual air pressure source and an air pressure gauge are arranged on the mounting platform;

[0017] The access plug is a 6-hole universal plug, and the access plug is electrically connected to the adapter plug through a wire. The adapter plug is a 6-hole universal plug, and the ①, ② and ③ wires of the adapter plug are electrically connected to the ①, ② and ③ pins of the low oil pressure sensor plug respectively, and the ④, ⑤ and ⑥ wires of the adapter plug are electrically connected to the fish mouth clip respectively;

[0018] The adapter plug is electrically connected to a serial port relay, and the serial port relay has fourteen relays;

[0019] The ① wire of the adapter plug is electrically connected to the normally open terminals of the position relays ①, ②, and ⑧ in the serial port relay;

[0020] The ② wire of the adapter plug is electrically connected to the normally open terminal of the position relays ③, ④, and ⑨ in the serial port relay;

[0021] The ③ wire of the adapter plug is electrically connected to the normally open terminal of the ⑤ and ⑥ position relays in the serial port relay;

[0022] The fourth wire of the adapter plug is connected to the serial port relay and the The normally open terminals of the position relay are electrically connected;

[0023] The fifth wire of the adapter plug is connected to the serial port relay and The normally open terminals of the position relay are electrically connected;

[0024] The ⑥ wire of the adapter plug is electrically connected to the normally open terminal of the ⑦ position relay in the serial port relay;

[0025] The common terminals of the position relays ①, ②, ③, ④, ⑤ and ⑥ in the serial relay are connected to the negative terminal of the panel megohmmeter through a wire;

[0026] The common terminal of the position relay ⑦ in the serial relay is connected to the positive terminal of the panel megohmmeter through a wire;

[0027] The common terminal of the position relay in the serial relay is connected to the positive terminal of the desktop DC power supply through a wire;

[0028] The common end of the position relay ⑨ in the serial port relay is connected to the negative end of the desktop DC power supply through a wire, and an indicator light is connected in series on the wire between the position relay ⑨ in the serial port relay and the negative end of the desktop DC power supply;

[0029] The common terminal of the position relay in the serial port relay is connected to the negative terminal of the desktop digital multimeter through a wire;

[0030] The serial relay The common terminal of the position relay is connected to the positive terminal of a benchtop digital multimeter through a wire;

[0031] The serial relay The common terminal of the position relay is connected to the positive terminal of the desktop DC power supply through a wire, and the serial relay An ohmic resistor is connected in series on the wire between the position relay and the positive terminal of the desktop DC power supply;

[0032] The serial relay The common terminal of the position relay is connected to the negative terminal of the benchtop DC power supply through a wire.

[0033] Preferably, a power socket and a heat dissipation hole are provided at one end of the device housing, and the power input of the power socket is 220V, 50Hz.

[0034] Preferably, a 5-hole national standard socket strip is provided in the device housing, and the 5-hole national standard socket strip is electrically connected to the embedded industrial all-in-one machine, desktop digital multimeter, panel-type megohmmeter, desktop DC power supply and serial port relay through wires respectively. The embedded industrial all-in-one machine is connected to the serial port relay through a USB to RS232 cable, so that the embedded industrial all-in-one machine controls the serial port relay to work.

[0035] Preferably, the metal high-pressure pipeline is connected to a manual air pressure source, the second stop valve is located between the connection position of the low-pressure port of the lubricating oil pressure low sensor and the connection position of the manual air pressure source on the metal high-pressure pipeline, and the exhaust valve and the first stop valve are respectively located between the connection position of the high-pressure port of the lubricating oil pressure low sensor and the connection position of the manual air pressure source on the metal high-pressure pipeline, wherein the second stop valve and the first stop valve are arranged in parallel, and the first stop valve and the first stop valve are respectively connected in series with the pressure gauge on the metal high-pressure pipeline, the pressure gauge and the third stop valve are arranged on the metal high-pressure pipeline between the pressure gauge and the first stop valve position and the low-pressure port and the second stop valve position on the metal high-pressure pipeline, the pressure gauge and the third stop valve are respectively connected in series with the second stop valve and the first stop valve on the metal high-pressure pipeline, and the pressure gauge and the third stop valve are arranged in parallel with the low-pressure port and the high-pressure port of the metal high-pressure pipeline.

[0036] The present invention also provides a method for using the above-mentioned aircraft engine low oil pressure sensor testing device, which is characterized by comprising the following steps:

[0037] S1. Power on and hardware connection:

[0038] S11. Turn on the power switch, and after all parts are powered on normally, prepare to connect the low oil pressure sensor;

[0039] S12. Remove the connecting screws and lock the low oil pressure sensor on the parts installation area;

[0040] S13. Use the adapter harness to connect the test device to the low oil pressure sensor through the adapter plug and the low oil pressure sensor plug;

[0041] S14, using two fish-mouth clamps electrically connected to the adapter plug to respectively connect the mounting surface of the low oil pressure sensor and any point at the top;

[0042] S15. Connect the metal high-pressure pipeline to the high-pressure port and the low-pressure port of the lubricating oil low pressure sensor respectively;

[0043] S16, open the test program on the embedded industrial integrated machine, and complete the test according to the test instructions;

[0044] S2. Specific test:

[0045] S21, high pressure port pressure test: input 400PSI pressure into the high pressure port of the low oil pressure sensor and maintain it for one minute. If there is no pressure release, it passes;

[0046] S22, pressure maintenance test: input 640PSI pressure at both high and low pressure ports of the low oil pressure sensor and maintain it for one minute. If there is no pressure release, it passes;

[0047] S23, insulation resistance test: measure the insulation resistance of pins ①, ②, ③ in the low oil pressure sensor plug and the low oil pressure sensor housing respectively. The test condition is 500VDC and the test is maintained for one minute. If the insulation resistance is greater than 100 megohms, it passes.

[0048] S24, bonding test: Use a desktop DC power supply to output 28V, 1A electrical excitation, and install a 28-ohm resistor at the positive pole of the DC power supply. Then connect the positive and negative wires to the mounting surface of the low oil pressure sensor and any point of the upper shell, respectively. Use a desktop digital multimeter to measure the voltage between the mounting surface of the low oil pressure sensor and the upper shell, and calculate the resistance value using R=U / I. When the resistance value is not greater than 5 milliohms, it passes;

[0049] S25. Operation test: Input 300PSI pressure to the high-pressure port and low-pressure port of the low oil pressure sensor through a manual air pressure source at the same time. At this time, close the first stop valve, the second stop valve and the third stop valve at the high-pressure port and the low-pressure port to maintain the pressure. Open the exhaust valve at the high-pressure port to slowly reduce the air pressure at the high-pressure port until the lubricating oil pressure sensor is actuated and close the exhaust valve; open the third stop valve to make the pressure at both ends equal. At this time, the low oil pressure sensor is actuated; close the third stop valve and open the exhaust valve again until the low oil pressure sensor is actuated. Observe the pressure gauge. If the difference between the high-pressure port pressure and the low-pressure port pressure when the low oil pressure sensor is actuated twice is between 58-62psi, it is passed.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] 1. The present invention highly integrates the test and measurement components, the parts installation components, and the air pressure source supply components, so that the cost is low and the use is more convenient, the operation complexity and the required space are reduced, and the test data and test results can be clearly and accurately recorded in accordance with the standard automatic test process, thereby improving the reliability and traceability of the test. By designing the low lubricating oil pressure sensor plug and the adapter plug, the electrical and physical connection between the low lubricating oil pressure switch and the test device is achieved, the connection process is simplified, and the stability and accuracy of the test are ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 This is a top view of the overall structure of an aircraft engine low oil pressure sensor testing device and method of the present invention;

[0053] Figure 2 This is a schematic diagram of the electrical connection between the adapter plug and the low lubricating oil pressure sensor plug of an aircraft engine low lubricating oil pressure sensor test device and method of the present invention;

[0054] Figure 3The present invention is a schematic diagram of the electrical connection between an adapter plug and a serial port relay structure of an aircraft engine low oil pressure sensor test device and method.

[0055] In the figure: 1. Embedded industrial all-in-one machine; 2. Desktop digital multimeter; 3. Panel megohmmeter; 4. Desktop DC power supply; 5. Power switch; 6. Indicator light; 7. Device nameplate; 8. Access plug; 9. Parts installation area; 10. Metal high-pressure pipeline; 11. Pressure gauge; 12. Serial relay; 13. First stop valve; 14. Second stop valve; 15. Third stop valve; 16. Manual air pressure source; 17. Pressure gauge; 18. Exhaust valve; 19. Fish mouth clamp; 20. Low oil pressure sensor plug; 21. Adapter plug; 22. Indicator light; 23. Ohm resistor. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] The existing technologies have the following disadvantages for different testing methods:

[0058] Test with engine running:

[0059] (1) The testing cost is high. The low oil pressure sensor cannot be replaced during the test run. Therefore, each test of a low oil pressure sensor requires the auxiliary power unit to be tested as a whole, resulting in a large amount of fuel consumption and possible damage to high-priced components such as the impeller and turbine.

[0060] (2) Test benches are very expensive, so a separate test bench is not set up for testing the low oil pressure sensor. Therefore, when there is no auxiliary power unit of the corresponding model on site or the test bench is occupied, the test cannot be performed.

[0061] Manual testing:

[0062] (1) During the test, a test pressure of more than 3000 kPa is required. There is a risk of the test pipeline collapsing under high pressure, causing the risk of personal injury.

[0063] (2) When measuring insulation resistance, the test voltage is as high as 500Vdc. When using a handheld megohmmeter for testing, there may be a risk of personal injury, especially when the insulation of the sensor is poor.

[0064] (3) Low integration and low degree of automation.

[0065] See also Figure 1-3 , the present invention provides a technical solution: an aircraft engine low oil pressure sensor test device and method, an aircraft engine low oil pressure sensor test device, comprising: a device housing, the device housing is provided with a test and measurement component, a parts installation component, an air pressure source air supply component, a serial port relay 12, a low oil pressure sensor plug 20 and a conversion plug 21, one end of the device housing is provided with a power socket and a heat dissipation hole, and the power input of the power socket is 220V, 50Hz;

[0066] The test and measurement components include an embedded industrial all-in-one machine 1, a desktop digital multimeter 2, a panel megohmmeter 3 and a desktop DC power supply 4. A 5-hole national standard socket strip is provided in the equipment housing, and the 5-hole national standard socket strip is electrically connected to the embedded industrial all-in-one machine 1, the desktop digital multimeter 2, the panel megohmmeter 3, the desktop DC power supply 4 and the serial port relay 12 through wires. The embedded industrial all-in-one machine 1 is connected to the serial port relay 12 through a USB to RS232 cable, so that the embedded industrial all-in-one machine 1 controls the serial port relay 12 to work;

[0067] The parts installation assembly includes a power switch 5, an indicator light 6, a device nameplate 7, an access plug 8, a parts installation area 9, a metal high-pressure pipeline 10, a pressure gauge 11, a first stop valve 13, a second stop valve 14, a third stop valve 15 and an exhaust valve 18. The metal high-pressure pipeline 10 is connected to a manual air pressure source 16. The second stop valve 14 is located between the connection position of the low-pressure port of the lubricating oil pressure sensor on the metal high-pressure pipeline 10 and the connection position of the manual air pressure source 16. The exhaust valve 18 and the first stop valve 13 are respectively located between the connection position of the high-pressure port of the lubricating oil pressure sensor on the metal high-pressure pipeline 10 and the connection position of the manual air pressure source 16. The second stop valve 14 and the first stop valve 13 are arranged in parallel, and the first stop valve 13 and the first stop valve 13 are respectively connected in series with the pressure gauge 17 on the metal high-pressure pipeline 10, the pressure gauge 11 and the third stop valve 15 are arranged on the metal high-pressure pipeline 10 between the pressure gauge 11 and the first stop valve 13 position and the low-pressure port and the second stop valve 14 position, the pressure gauge 11 and the third stop valve 15 are respectively connected in series with the second stop valve 14 and the first stop valve 13 on the metal high-pressure pipeline 10, and the pressure gauge 11 and the third stop valve 15 are arranged in parallel with the low-pressure port and the high-pressure port of the metal high-pressure pipeline 10, wherein the arrangement is as follows Figure 1 As shown;

[0068] The air pressure source supply assembly includes a mounting platform, and a manual air pressure source 16 and an air pressure gauge 17 are provided on the mounting platform;

[0069] The access plug 8 is a 6-hole universal plug, and the access plug 8 is electrically connected to the adapter plug 21 through a wire. The adapter plug 21 is a 6-hole universal plug, and the ①, ② and ③ wires of the adapter plug 21 are electrically connected to the ①, ② and ③ pins of the low oil pressure sensor plug 20, respectively, and the ④, ⑤ and ⑥ wires of the adapter plug 21 are electrically connected to the fish mouth clip 19, respectively;

[0070] The adapter plug 21 is electrically connected to the serial port relay 12. Figure 3 As shown;

[0071] The ① wire of the adapter plug 21 is electrically connected to the normally open terminals of the position relays ①, ②, and ⑧ in the serial port relay 12;

[0072] The wire ② of the adapter plug 21 is electrically connected to the normally open terminals of the position relays ③, ④, and ⑨ in the serial port relay 12;

[0073] The ③ wire of the adapter plug 21 is electrically connected to the normally open terminal of the ⑤ and ⑥ position relays in the serial port relay 12;

[0074] Connect the ④ wire of the adapter plug 21 to the ⑩ wire of the serial relay 12 The normally open terminals of the position relay are electrically connected;

[0075] The fifth wire of the adapter plug 21 is connected to the serial port relay 12 and The normally open terminals of the position relay are electrically connected;

[0076] The ⑥ wire of the adapter plug 21 is electrically connected to the normally open terminal of the ⑦ position relay in the serial port relay 12;

[0077] The common terminals of the position relays ①, ②, ③, ④, ⑤ and ⑥ in the serial relay 12 are connected to the negative terminal of the panel megohmmeter 3 through a wire;

[0078] The common terminal of the ⑦ position relay in the serial relay 12 is connected to the positive terminal of the panel megohmmeter 3 through a wire;

[0079] The common terminal of the position relay ⑧ in the serial relay 12 is connected to the positive terminal of the desktop DC power supply 4 through a wire;

[0080] The common end of the ⑨ position relay in the serial port relay 12 is connected to the negative end of the desktop DC power supply 4 through a wire, and an indicator light 22 is connected in series on the wire between the ⑨ position relay in the serial port relay 12 and the negative end of the desktop DC power supply 4;

[0081] The common terminal of the position relay ⑩ in the serial relay 12 is connected to the negative terminal (black line terminal) of the desktop digital multimeter 2 through a wire;

[0082] Serial relay 12 The common terminal of the position relay is connected to the positive terminal (red line terminal) of the benchtop digital multimeter 2 through a wire;

[0083] Serial relay 12 The common terminal of the position relay is connected to the positive terminal of the desktop DC power supply 4 through a wire, and the serial port relay 12 An ohmic resistor 23 is connected in series on the wire between the position relay and the positive terminal of the desktop DC power supply 4, wherein the ohmic resistor 23 is 28 ohms;

[0084] Serial relay 12 The common end of the position relay is connected to the negative end of the desktop DC power supply 4 through a wire. The entire device of the present invention is 1000mm long, 800mm wide and 600mm wide. It is small in size and square in shape, which is convenient for storage, placement and transportation.

[0085] The present invention also provides a method for using the above-mentioned aircraft engine low oil pressure sensor testing device, which is characterized by comprising the following steps:

[0086] S1. Power on and hardware connection:

[0087] S11, turn on the power switch 5, wait until all parts are powered on normally, and prepare to connect the low oil pressure sensor;

[0088] S12. Remove the connecting screws and lock the low oil pressure sensor on the component installation area 9;

[0089] S13, using the adapter harness to connect the test device to the low lubricating oil pressure sensor through the adapter plug 21 and the low lubricating oil pressure sensor plug 20 (6-hole universal plug);

[0090] S14, using two fish-mouth clamps 19 electrically connected to the adapter plug 21 to respectively connect the mounting surface of the low oil pressure sensor and any point at the top;

[0091] S15, connecting the metal high-pressure pipeline 10 to the high-pressure port and the low-pressure port of the lubricating oil low pressure sensor respectively;

[0092] S16, opening the test program on the embedded industrial all-in-one machine 1, and completing the test according to the test instructions.

[0093] S2. Specific test:

[0094] S21, High-voltage port withstand voltage test: Select the "Test 1-High-voltage port withstand voltage test" option in the test program of embedded industrial integrated machine 1. At this time, close it according to the prompt Figure 1Open the second stop valve 14, the third stop valve 15 and the exhaust valve 18, open the first stop valve 13, use the manual air pressure source 16 to pressurize, until the pressure gauge 17 on the manual air pressure source 16 indicates 400PSI (2758kPa), lock the manual air pressure source 16 and stop output, observe Figure 1 The indication of the barometer 17 changes. If the indication of the barometer 17 does not change within one minute, the test passes; if the pressure drops, the test fails;

[0095] S22, maintain pressure test: Select the "Test 2 - Maintain Pressure Test" option in the test program of embedded industrial integrated machine 1. At this time, close it according to the prompt Figure 1 Open the third stop valve 15 and the exhaust valve 18, open the second stop valve 14 and the first stop valve 13, and use the manual air pressure source 16 to pressurize until the pressure gauge 17 on the manual air pressure source 16 indicates 640PSI (4413kPa), then lock the manual air pressure source 16 and stop output, and observe the change of the pressure gauge 17. If the pressure value of the pressure gauge does not change within one minute, the test passes; if the pressure value drops, the test fails;

[0096] S23, insulation resistance test: Select the option "Test 3 - Insulation resistance test" in the test program of the embedded industrial integrated machine 1. At this time, remove the metal high-pressure pipe 10 from the low oil pressure sensor according to the prompt. The test program will control the serial port relay 12 and the panel megohmmeter 3 to measure the insulation resistance values ​​of the ① pin, ② pin and ③ pin in the low oil pressure sensor plug 20 and the low oil pressure sensor housing. During the test, the panel megohmmeter 3 is set by the program at this time to test the voltage of 500VDC, and the test duration is 1 minute; the test program first controls the serial port relay 12 to open the ① position relay and the ⑦ position relay to test the insulation resistance between the ① pin in the low oil pressure sensor plug 20 and the housing; secondly, the ① position relay in the serial port relay 12 is closed first, and the ② position relay is opened to test the insulation resistance between the ② pin in the low oil pressure sensor plug 20 and the housing; then the ② position relay in the serial port relay 12 is closed, and the ③ position relay is opened to test the insulation resistance between the ③ pin in the low oil pressure sensor plug 20 and the housing; then the ③ position relay is closed, and the ④, ⑤ and ⑥ position relays are opened at the same time to test the insulation resistance between the ① pin, the ② pin and the ③ pin in the low oil pressure sensor plug 20 and the housing at the same time. If the insulation resistance is greater than 100 megohms, it passes;

[0097] S24, bonding test: After selecting the "Test 4-Bonding Test" option in the test program of the embedded industrial all-in-one machine 1, use the fish mouth clamp 19 to clamp the base of the low oil pressure sensor and any point on the top. At this time, the test program controls the console DC power supply 4 to output 28VDC, 1A electrical excitation; controls the serial port relay 12 to open at the same time and Position relay; control console digital multimeter 2 reads the voltage value, and the program automatically calculates the resistance value using R=U / I. When the resistance value is not greater than 5 milliohms, the test passes;

[0098] S25. Operation test: Input 300PSI (2069kPa) pressure to the high-pressure port and low-pressure port of the low oil pressure sensor through the manual air pressure source 16. At this time, close the first stop valve 13, the second stop valve 14 and the third stop valve 15 at the high-pressure port and the low-pressure port to maintain the pressure. Open the exhaust valve 18 at the high-pressure port to slowly reduce the air pressure at the high-pressure port until the lubricating oil pressure sensor is actuated, and close the exhaust valve 18; open the third stop valve 15 to make the pressure at both ends equal. At this time, the low oil pressure sensor is actuated; close the third stop valve 15, and open the exhaust valve 18 again until the low oil pressure sensor is actuated. Observe the pressure gauge 11. If the difference between the high-pressure port pressure and the low-pressure port pressure when the low oil pressure sensor is actuated twice is between 58-62psi (400-428kPa), it is passed.

[0099] The present invention establishes an automatic test device for the low oil pressure sensor of the V2500 model engine, and realizes efficient and accurate testing of the low oil pressure sensor. Through the integrated circuit control part, the pressure test part and the instrument interface part, the test device is not only highly integrated and easy to use, but also can complete each test item according to the standard test process, and can clearly and accurately record the test data and test results. In addition, the test device is compact in design and square in shape, which is convenient for storage, placement and transportation. By designing the adapter harness and the mounting hole, the electrical connection and physical connection between the low-voltage oil switch and the test device are realized, which further improves the efficiency and accuracy of the test.

[0100] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0101] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An aircraft engine oil pressure low sensor test device, characterized in that: include: An equipment housing, wherein the equipment housing is provided with a test and measurement assembly, a parts installation assembly, an air pressure source air supply assembly, a serial port relay (12), a low lubricating oil pressure sensor plug (20) and a switching plug (21); The test and measurement component comprises an embedded industrial all-in-one machine (1), a desktop digital multimeter (2), a panel megohmmeter (3) and a desktop direct current power supply (4); The parts installation assembly comprises a power switch (5), an indicator light (6), a device nameplate (7), an access plug (8), a parts installation area (9), a metal high-pressure pipeline (10), a pressure gauge (11), a first stop valve (13), a second stop valve (14), a third stop valve (15) and an exhaust valve (18); The air pressure source air supply assembly comprises a mounting platform, and a manual air pressure source (16) and an air pressure gauge (17) are arranged on the mounting platform; The access plug (8) is a 6-hole universal plug, and the access plug (8) is electrically connected to the adapter plug (21) through a wire, the adapter plug (21) is a 6-hole universal plug, and the ①, ② and ③ wires of the adapter plug (21) are electrically connected to the ①, ② and ③ pins of the low lubricating oil pressure sensor plug (20) respectively, and the ④, ⑤ and ⑥ wires of the adapter plug (21) are electrically connected to the fish mouth clip (19) respectively; The adapter plug (21) is electrically connected to the serial port relay (12); The ① conductor of the adapter plug (21) is electrically connected to the normally open terminals of the position relays ①, ②, and ⑧ in the serial port relay (12); The wire ② of the adapter plug (21) is electrically connected to the normally open terminal connection terminals of the position relays ③, ④, and ⑨ in the serial port relay (12); The wire ③ of the adapter plug (21) is electrically connected to the normally open terminal connection terminals ⑤ and ⑥ of the position relay in the serial port relay (12); The fourth wire of the adapter plug (21) is connected to the fifth wire of the serial port relay (12) and The normally open terminals of the position relay are electrically connected; The fifth wire of the adapter plug (21) and the serial port relay (12) are connected to each other. and The normally open terminals of the position relay are electrically connected; The ⑥ conductor of the adapter plug (21) is electrically connected to the normally open terminal of the ⑦ position relay in the serial port relay (12); The common terminals of the position relays ①, ②, ③, ④, ⑤ and ⑥ in the serial relay (12) are connected to the negative terminal of the panel megohmmeter (3) through a wire; The common terminal of the position relay ⑦ in the serial port relay (12) is connected to the positive terminal of the panel megohmmeter (3) through a wire; The common terminal of the position relay ⑧ in the serial port relay (12) is connected to the positive terminal of the desktop DC power supply (4) through a wire; The common end of the position relay ⑨ in the serial port relay (12) is connected to the negative terminal of the desktop DC power supply (4) through a wire, and an indicator light (22) is connected in series on the wire between the position relay ⑨ in the serial port relay (12) and the negative terminal of the desktop DC power supply (4); The common terminal of the position relay (10) in the serial port relay (12) is connected to the negative terminal of the desktop digital multimeter (2) through a wire; The serial port relay (12) The common terminal of the position relay is connected to the positive terminal of a benchtop digital multimeter (2) through a wire; The serial port relay (12) The common terminal of the position relay is connected to the positive terminal of the desktop DC power supply (4) through a wire, and the serial port relay (12) An ohmic resistor (23) is connected in series on the wire between the position relay and the positive terminal of the desktop DC power supply (4); The serial port relay (12) The common terminal of the position relay is connected to the negative terminal of a benchtop DC power supply (4) through a wire.

2. The aircraft engine oil pressure low sensor test device according to claim 1, characterized in that: A power socket and a heat dissipation hole are provided at one end of the device housing, and the power input of the power socket is 220V, 50Hz.

3. The aircraft engine oil pressure low sensor test device according to claim 2, characterized in that: A 5-hole national standard socket strip is arranged in the housing of the device, and the 5-hole national standard socket strip is electrically connected to the embedded industrial all-in-one machine (1), a desktop digital multimeter (2), a panel-type megohmmeter (3), a desktop DC power supply (4) and a serial port relay (12) through wires, and the embedded industrial all-in-one machine (1) is connected to the serial port relay (12) through a USB to RS232 cable, so that the embedded industrial all-in-one machine (1) controls the serial port relay (12) to work.

4. The aircraft engine oil pressure low sensor test device according to claim 1, characterized in that: The metal high-pressure pipeline (10) is connected to the manual air pressure source (16), the second stop valve (14) is located between the metal high-pressure pipeline (10) and the low-pressure port connection position of the lubricating oil pressure sensor and the manual air pressure source (16), and the exhaust valve (18) and the first stop valve (13) are respectively located between the metal high-pressure pipeline (10) and the high-pressure port connection position of the lubricating oil pressure sensor and the manual air pressure source (16), wherein the second stop valve (14) and the first stop valve (13) are arranged in parallel, and the first stop valve (13) and the first stop valve (13) are respectively connected to the pressure gauge. (17) is connected in series to the metal high-pressure pipeline (10), the pressure gauge (11) and the third stop valve (15) are arranged on the metal high-pressure pipeline (10) between the pressure gauge (11) and the first stop valve (13) and the low-pressure port and the second stop valve (14) on the metal high-pressure pipeline (10), the pressure gauge (11) and the third stop valve (15) are connected in series to the metal high-pressure pipeline (10) with the second stop valve (14) and the first stop valve (13), respectively, and the pressure gauge (11) and the third stop valve (15) are arranged in parallel with the low-pressure port and the high-pressure port of the metal high-pressure pipeline (10).

5. A method for using the aircraft engine low oil pressure sensor test device according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Power on and hardware connection: S11, turn on the power switch (5), wait for all parts to be powered on normally, and prepare to connect the low oil pressure sensor; S12. Remove the connecting screws and lock the low oil pressure sensor on the component installation area (9); S13, using an adapter harness to connect the test device to the low lubricating oil pressure sensor through an adapter plug (21) and a low lubricating oil pressure sensor plug (20); S14, using two fish-mouth clamps (19) electrically connected to the adapter plug (21) to respectively connect the mounting surface of the low oil pressure sensor and any point at the top; S15, connecting the metal high-pressure pipeline (10) to the high-pressure port and the low-pressure port of the lubricating oil low pressure sensor respectively; S16, opening the test program on the embedded industrial all-in-one machine (1), and completing the test according to the test instructions; S2. Specific test: S21, high pressure port pressure test: input 400PSI pressure into the high pressure port of the low oil pressure sensor and maintain it for one minute. If there is no pressure release, it passes; S22, pressure maintenance test: input 640PSI pressure at both high and low pressure ports of the low oil pressure sensor and maintain it for one minute. If there is no pressure release, it passes; S23, insulation resistance test: measure the insulation resistance of pin 1, pin 2, pin 3 of the low oil pressure sensor plug (20) and the low oil pressure sensor housing respectively, the test condition is 500VDC, and the test is maintained for one minute. If the insulation resistance is greater than 100 megohms, it is passed; S24, bonding test: Use a desktop DC power supply (4) to output 28V, 1A electrical excitation, and install a 28-ohm resistor (23) at the positive electrode of the DC power supply. Then connect the positive and negative wires to the mounting surface of the low oil pressure sensor and any point of the upper shell, respectively. Use a desktop digital multimeter (2) to measure the voltage between the mounting surface of the low oil pressure sensor and the upper shell, and calculate the resistance value using R=U / I. When the resistance value is not greater than 5 milliohms, it is passed; S25, Operation test: Input 300PSI pressure to the high-pressure port and low-pressure port of the low oil pressure sensor through the manual air pressure source (16). At this time, close the first stop valve (13), the second stop valve (14) and the third stop valve (15) at the high-pressure port and the low-pressure port to maintain the pressure. Open the exhaust valve (18) at the high-pressure port to slowly reduce the air pressure at the high-pressure port until the lubricating oil pressure sensor is actuated. Close the exhaust valve (18); open the third stop valve (15) to make the pressure at both ends equal. At this time, the low oil pressure sensor is actuated; close the third stop valve (15), open the exhaust valve (18) again until the low oil pressure sensor is actuated, and observe the pressure gauge (11). If the difference between the high-pressure port pressure and the low-pressure port pressure when the low oil pressure sensor is actuated twice is between 58-62psi, it is passed.

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