Use method of multipurpose airplane environment control system bleed air pressure detection box

Abstract

The invention belongs to the technical field of flight environment control testing, and particularly relates to a use method of a multipurpose airplane environment control system bleed air pressure detection box. The device comprises a power supply voltmeter 3, a sensor output voltmeter 4, an output pressure gauge 6, a pressure storage bottle pressure gauge 7, a vacuum air pump 19, a power switch 23, a battery pack 16, a start switch 9, a stop switch 12, an air entraining overpressure indicating lamp 1, an air entraining normal indicating lamp 2, an air pump work indicating lamp 10, an air pump standby indicating lamp 11, an audible and visual alarm 20 and a test socket 22. The engine bleed air display and alarm system can be comprehensively detected without test run and dislocation, detection data are real and reliable, a reliable means is provided for troubleshooting of the bleed air display and alarm system, and the engine bleed air display and alarm system is suitable for multi-scene and multi-model sensor detection. Especially when the bleed air pressure display and alarm system of the environmental control system breaks down, the purposes of checking, elimination and detection can be efficiently and rapidly achieved, the labor cost is saved, the working time is saved, and the working efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of flight environmental control testing, and in particular relates to a method for using a bleed air pressure detection box for an environmental control system of a multi-purpose aircraft. Background Art

[0002] The aircraft bleed air system provides a common compressed air source for each air system. The aircraft air system includes the air conditioning system, hot air anti-icing (de-icing) system, lubricating oil cooling and injection system, and hydraulic oil tank pressurization system. The bleed air system consists of a pressure regulating / shutoff valve, a bleed air overpressure sensor, a flow cut-off valve cross valve, and a bleed air pressure sensor. When the engine air supply switch is turned on, the high-pressure air from the tenth stage compressor of the engine is reduced in pressure through the pressure regulating / shutoff valve and provided to each air system through various control valves. The bleed air pressure sensor monitors the pressure of the bleed air system at any time and displays it on the EICAS environmental control screen. When the pressure exceeds the specified pressure, the bleed air overpressure sensor sends an alarm signal, the bleed air "overpressure" alarm yellow light on the control panel turns on, and the "bleed air overpressure" alarm in the comprehensive alarm is triggered, reminding the bleed air pressure system failure. The bleed air overpressure sensor is a pressure signal device. When the bleed air pressure exceeds the specified value, an overpressure warning signal is issued. The bleed air pressure sensor GYY-8 detects the bleed air pressure behind the pressure regulating / shutoff valve of the bleed air system. Whether these two sensors work properly or not is directly related to the working status of the bleed air system. In daily production and flight processes, problems such as low engine bleed air pressure, unstable values, and overpressure warning lights often occur. To troubleshoot the above problems, it is necessary to open the closed cover, remove the relevant sensors, and check their external working circuits. The sensor is installed in the closed cover of the engine room, and the space is small. Each time a troubleshooting inspection is performed, the relevant cover needs to be opened to remove it from the aircraft and send it to the field for relevant calibration and inspection. When removing the sensor, the high-altitude and electrical professionals need to cooperate at the same time. This type of operation method is not very operational during daily troubleshooting inspections, and the waiting time for the calibration results is long, which is not conducive to the rapid search and location of problems. Repeated disassembly and assembly of sensors is a large workload, which is easy to cause secondary quality hazards and poses safety risks. Summary of the invention

[0003] The technical problem solved by the present invention is as follows: According to the previous troubleshooting inspection method, it is necessary to open the cover of the air bleed room and then remove the sensor and send it to the field for relevant performance testing (waiting for the results takes a long time), and use a multimeter to judge the conduction of the external circuit of the sensor. This work has many disadvantages such as poor practical operability, many personnel required for inspection, and long troubleshooting time. In view of the above problems, a set of special inspection and testing devices is invented. The sensor can perform data detection without leaving the position, and the external circuit of the sensor does not need to be measured by a multimeter for conduction. The working status of the sensor and the external circuit in the entire bleed air measurement system can be directly determined by directly using this set of devices. The use of this set of devices can effectively reduce repetitive work, reduce staff, improve work efficiency, and avoid quality and safety hazards. In order to eliminate the above disadvantages, the present invention can quickly and efficiently complete the inspection of the bleed air pressure indication and alarm system, meet the various pressure indication inspections and overpressure alarm contents required by the documents, and neither damage the onboard equipment nor protect the safety of the finished aircraft, but also can fully complete the inspection contents required by the technical documents. The device has the functions of adjustable output pressure range, visual digital display of pressure value, overpressure protection alarm, etc. Control and protection are carried out from the hardware aspect to protect the safety of airborne equipment. The operation is simple and reliable, and the digital pressure value is intuitively displayed. The inspection work can be completed by one person independently.

[0004] The technical solution of the present invention:

[0005] On the one hand, the present invention provides a bleed air pressure detection device for a multi-purpose aircraft environmental control system, the device comprising: a power supply voltage meter 3, a sensor output voltage meter 4, an output pressure meter 6, a pressure accumulator bottle pressure meter 7, a vacuum air pump 19, a power switch 23, a battery pack 16, a start switch 9, a stop switch 12, a bleed air overpressure indicator light 1, a bleed air normal indicator light 2, an air pump working indicator light 10, an air pump standby indicator light 11, an audible and visual alarm 20, and a test socket 22;

[0006] The positive electrode of the battery pack 16 is connected to the power supply voltage meter 3, the sensor output voltage meter 4, the output pressure meter 6, the pressure accumulator bottle pressure meter 7, the sound and light alarm 20, the positive electrode of the intermediate relay, and the normally closed point of the relay through the power switch 23;

[0007] The positive electrode of the battery pack 16 controls the relay to work and maintain self-locking through the power switch 23 and the start switch 9; after the relay works, the positive electricity passes from the positive electrode output point of the intermediate relay through the relay to the positive electrode of the vacuum air pump 19, and the positive and negative electrodes of the air pump working indicator light 10 are respectively connected to the positive and negative electrodes of the vacuum air pump 19;

[0008] The positive pole of the air pump standby indicator light 11 is connected to the normally closed point of the relay, and the negative pole of the air pump standby indicator light 11 is connected to the negative pole of the battery pack 16;

[0009] The signal output end of the output pressure gauge 6 is connected to the positive poles of the bleed air overpressure indicator light 1 and the bleed air normal indicator light 2 respectively, and the negative poles of the bleed air overpressure indicator light 1 and the bleed air normal indicator light 2 are connected to the negative pole of the battery pack 16;

[0010] The voltage measuring end of the sensor output voltmeter 4 is connected to the test socket 22, and the test socket 22 is connected to the bleed air pressure sensor and the bleed air overpressure sensor on the machine through the test cable;

[0011] The signal output terminal of the pressure accumulator bottle pressure gauge 7 is connected to the signal input point of the intermediate relay;

[0012] The negative poles of the power supply voltage meter 3, the sensor output voltage meter 4, the output pressure meter 6, and the pressure storage bottle pressure meter 7 are respectively connected to the negative pole of the battery pack 16;

[0013] The negative pole of the sound and light alarm 20 is connected to the test socket 22 .

[0014] Furthermore, the device also includes: a pressure regulating valve 5, a pressure accumulator bottle pressure relief valve 8, and an output interface 21;

[0015] The vacuum air pump 19 pressurizes the pressure accumulator bottle 17 through the four-way valve, and the gas in the pressure accumulator bottle 17 reaches the pressure regulating valve 5 through the four-way valve and the one-way valve. The pressure regulating valve 5 is connected to the output interface 21 through the three-way valve to supply pressure to the onboard bleed air pressure sensor and the bleed air overpressure sensor;

[0016] The three-way valve is connected to the output pressure gauge 6 to display the output pressure;

[0017] The pressure gauge 7 of the pressure accumulator bottle is connected to the pressure accumulator bottle through the pressure accumulator bottle pressure relief valve 8 and the four-way valve, and is used to display the pressure of the pressure accumulator bottle.

[0018] On the other hand, the present invention also provides a multi-purpose aircraft environmental control system bleed air pressure detection box, the detection box is based on the detection device, the detection box comprises:

[0019] A portable all-aluminum alloy chassis is used as a carrier, and the interior is composed of at least 1 battery pack, 1 vacuum air pump, 1 pressure accumulator, 1 sound and light alarm, 1 power supply voltmeter, 1 sensor output voltmeter, 1 relay, 1 intermediate relay, 1 output pressure gauge, 1 pressure accumulator pressure gauge, 1 pressure accumulator pressure relief valve and 1 pressure regulating valve;

[0020] a. The battery pack has a rated voltage of 24V and a capacity of 9000mA, and is used to power each module in the chassis;

[0021] b. The vacuum air pump provides the pressure source for the test equipment;

[0022] c. The pressure accumulator bottle stores the output pressure of the vacuum air pump to ensure stable pressure;

[0023] d. Sound and light alarm, when the pressure value exceeds the alarm value, an alarm signal is issued;

[0024] e. The power supply voltage meter displays the power supply voltage; the sensor output voltage meter displays the sensor output voltage;

[0025] f. The pressure gauge of the pressure accumulator bottle displays the pressure of the pressure accumulator bottle; the output pressure gauge displays the inlet pressure of the sensor;

[0026] g. The pressure relief valve of the pressure accumulator bottle is used to release excess pressure in the pressure accumulator bottle; the pressure regulating valve is used to stably adjust the output pressure to the working pressure.

[0027] Furthermore, the box also includes:

[0028] Rear cover 15;

[0029] The rear cover plate 15 is provided with an output interface 21, a test socket 22, a power switch 23, and a charging interface 24;

[0030] The charging interface 24 is used to charge the battery pack.

[0031] On the other hand, the present invention also provides a method for using a bleed air pressure detection box for a multi-purpose aircraft environmental control system, the method for using the box body comprising:

[0032] Pre-test preparations;

[0033] Press the start switch 9, the air pump working indicator light 10 lights up, the vacuum air pump 19 starts to work to pressurize the pressure accumulator bottle 17, and the pressure gauge 7 of the pressure accumulator bottle starts to indicate that when the pressure reaches 500Kpa, the vacuum air pump 19 automatically stops working; during the pressurization process, press the stop switch 12 to manually stop the vacuum air pump, and the air pump standby indicator light 11 lights up, indicating that the air pump is in standby mode;

[0034] Rotate the pressure regulating valve 5 clockwise, and the pressure accumulator 17 starts to output pressure gas source to the bleed air pressure sensor and the bleed air overpressure sensor. At this time, the sensor output voltage meter 4 shows that the pressure regulating valve 5 rotates clockwise to increase the pressure, counterclockwise to reduce the pressure, and does not move to maintain the pressure;

[0035] Adjust the pressure to the corresponding working pressure of the bleed air pressure sensor and the bleed air overpressure sensor respectively, the output pressure gauge 6 will display the corresponding pressure, and the sensor output voltage gauge 4 will display the corresponding voltage;

[0036] When the output pressure gauge 6 shows a pressure of 213-264Kpa, the normal air intake indicator lights up, and the sensor output voltage gauge 4 indicates a voltage of 2710-3250mv±166.5mv, indicating that the air intake pressure sensor is working normally, otherwise it is abnormal;

[0037] When the pressure displayed on the output pressure gauge 6 reaches 440-460Kpa, the bleed air overpressure indicator light comes on. If the overpressure value is maintained for 15-30 seconds, the sound and light alarm 20 sends out an alarm signal, indicating that the bleed air overpressure sensor is working normally, otherwise it is abnormal.

[0038] Further, the preparatory work before the test includes:

[0039] Open the relevant engine covers, disconnect the connecting pipes and cable plugs between the bleed air pressure sensor and the bleed air overpressure sensor and the aircraft, connect one end of the test cable to the sockets of the bleed air pressure sensor and the bleed air overpressure sensor, connect the other end of the test cable to the test socket on the box, connect one end of the test pipeline to the input interface of the bleed air pressure sensor and the bleed air overpressure sensor, and connect the other end of the test pipeline to the output interface on the box; turn on the power switch 23 on the box, the power supply voltmeter 3 indicates 24V, the sensor output voltmeter 4 indicates 0V, the pressure accumulator bottle pressure gauge 6 and the output pressure gauge 7 indicate 0KPa, and the air pump standby indicator light 11 is on, indicating that the equipment is powered normally.

[0040] Furthermore, the method further comprises:

[0041] After the test is completed, open the pressure relief valve 8 to release the pressure in the pressure accumulator bottle. The test cable and test pipeline can be disconnected only when the pressure gauge 7 of the pressure accumulator bottle indicates 0.

[0042] Furthermore, the method further comprises:

[0043] When the bleed air pressure test box of the multi-purpose aircraft environmental control system has been idle for more than 3 months or the power supply voltage meter 3 indicates a voltage less than 22V after the power switch 23 is turned on, it should be charged. Connect the dedicated charger to the box charging interface 24 for charging.

[0044] Compared with the prior art methods, the beneficial effects of the present invention are: the present invention can provide a stable working air source for the bleed air pressure sensor and the bleed air overpressure sensor of the engine bleed air system in all states, quickly detect the working condition of the sensor without engine test and finished product leaving the position, and the external circuit of the sensor does not need to be measured by a multimeter for conduction measurement. The working state of the sensor and the external circuit in the entire bleed air measurement system can be directly determined by directly using the set of devices. The inspection work of the bleed air pressure indication and alarm system can be completed quickly and efficiently, and various pressure indication inspections and overpressure alarm contents required by the documents can be met, without damaging the onboard equipment and protecting the safety of the finished aircraft, and the inspection contents required by the technical documents can be completed in full. The device completely simulates the bleed air output of the bleed air system, and has the functions of adjustable output pressure range, visual pressure value digital display, overpressure protection alarm, etc. Control protection is carried out from the hardware aspect, the safety of the onboard equipment is protected, the operation is simple and reliable, and the digital display pressure value is intuitively displayed. When the system fails and has problems, the purpose of inspection, elimination and detection can be achieved efficiently and quickly. Various problems that occur in the indication of the bleed air pressure system of the aircraft during flight can be solved. The equipment is light in weight and small in size, easy to carry. It is equipped with a rechargeable battery pack, a stable and reliable input gas source, and simple operation. It provides a reliable guarantee for aircraft commissioning, flight, and system troubleshooting. It can quantify and display input / output signals based on the data provided by the test equipment, effectively saving working time. It meets the requirements of aircraft production sites and field use. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 Aircraft environmental control system bleed air pressure detection device composition block diagram;

[0046] Figure 2 Three-dimensional diagram of the bleed air pressure detection device of the aircraft environmental control system;

[0047] Figure 3 Electrical schematic diagram of the bleed air pressure detection device of the aircraft environmental control system;

[0048] Figure 4 :Aircraft environmental control system bleed air pressure detection device gas source principle diagram

[0049] in Figure 1 In: 1. Air bleed overpressure indicator light 2. Air bleed normal indicator light 3. Power supply voltmeter 4. Sensor output voltmeter 5. Pressure regulating valve 6. Output pressure gauge: 7. Pressure gauge of pressure accumulator bottle 8. Pressure relief valve of pressure accumulator bottle 9. Start switch; 10. Air pump working indicator light 11. Air pump standby indicator light 12. Stop switch 13. Panel 14. Box 15. Rear cover 16. Battery pack 17. Pressure accumulator bottle 18. Terminal block 19. Vacuum air pump 20. Sound and light alarm 21. Output interface 22. Test socket 23. Power switch 24. Charging interface. DETAILED DESCRIPTION

[0050] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings.

[0051] According to the technical documents and the power supply line and bleed air pressure requirements of the finished sensor, the working principle of the bleed air pressure sensor is based on the piezoresistive effect of the silicon piezoresistive sensitive component. After sensing the pressure, the sensitive component can output a small DC voltage signal that is linearly related to the pressure. After being processed by the signal processing circuit, a DC voltage signal is output. When the bleed air overpressure sensor senses normal pressure at the inlet, the switch valve is closed, there is no pressure in the shell component cavity, and the indicator component does not indicate. When the inlet pressure rises to the indicated pressure, the valve opens, and the gas enters the shell cavity through the throttle valve, causing the pressure in the cavity to gradually increase. After 15 to 30 seconds, when the pressure in the cavity rises to a certain value, the bellows pressure-sensing output is displaced, the microswitch is controlled to be turned on, and an electrical signal is sent to turn on the alarm indication.

[0052] The present invention provides a multi-purpose aircraft environmental control system bleed air pressure detection device, such as Figure 1 , 3 4, the device comprises: a power supply voltage meter 3, a sensor output voltage meter 4, an output pressure meter 6, a pressure accumulator bottle pressure meter 7, a vacuum air pump 19, a power switch 23, a battery pack 16, a start switch 9, a stop switch 12, an air bleed overpressure indicator light 1, an air bleed normal indicator light 2, an air pump working indicator light 10, an air pump standby indicator light 11, an audible and visual alarm 20, and a test socket 22;

[0053] The positive electrode of the battery pack 16 is connected to the power supply voltage meter 3, the sensor output voltage meter 4, the output pressure meter 6, the pressure accumulator bottle pressure meter 7, the sound and light alarm 20, the positive electrode of the intermediate relay, and the normally closed point of the relay through the power switch 23;

[0054] The positive electrode of the battery pack 16 controls the relay to work and maintain self-locking through the power switch 23 and the start switch 9; after the relay works, the positive electricity passes from the positive electrode output point of the intermediate relay through the relay to the positive electrode of the vacuum air pump 19, and the positive and negative electrodes of the air pump working indicator light 10 are respectively connected to the positive and negative electrodes of the vacuum air pump 19;

[0055] The positive pole of the air pump standby indicator light 11 is connected to the normally closed point of the relay, and the negative pole of the air pump standby indicator light 11 is connected to the negative pole of the battery pack 16;

[0056] The signal output end of the output pressure gauge 6 is connected to the positive poles of the bleed air overpressure indicator light 1 and the bleed air normal indicator light 2 respectively, and the negative poles of the bleed air overpressure indicator light 1 and the bleed air normal indicator light 2 are connected to the negative pole of the battery pack 16;

[0057] The voltage measuring end of the sensor output voltmeter 4 is connected to the test socket 22, and the test socket 22 is connected to the bleed air pressure sensor and the bleed air overpressure sensor on the machine through the test cable;

[0058] The signal output terminal of the pressure accumulator bottle pressure gauge 7 is connected to the signal input point of the intermediate relay;

[0059] The negative poles of the power supply voltage meter 3, the sensor output voltage meter 4, the output pressure meter 6, and the pressure storage bottle pressure meter 7 are respectively connected to the negative pole of the battery pack 16;

[0060] The negative pole of the sound and light alarm 20 is connected to the test socket 22 .

[0061] The device also includes: a pressure regulating valve 5, a pressure accumulator bottle pressure relief valve 8, and an output interface 21;

[0062] The vacuum air pump 19 pressurizes the pressure accumulator bottle 17 through the four-way valve, and the gas in the pressure accumulator bottle 17 reaches the pressure regulating valve 5 through the four-way valve and the one-way valve. The pressure regulating valve 5 is connected to the output interface 21 through the three-way valve to supply pressure to the onboard bleed air pressure sensor and the bleed air overpressure sensor;

[0063] The three-way valve is connected to the output pressure gauge 6 to display the output pressure;

[0064] The pressure gauge 7 of the pressure accumulator bottle is connected to the pressure accumulator bottle through the pressure accumulator bottle pressure relief valve 8 and the four-way valve, and is used to display the pressure of the pressure accumulator bottle.

[0065] like Figure 2 As shown in the figure, the test equipment consists of a (135*270*205mm) portable all-aluminum alloy chassis (box body) as the carrier, and the interior is mainly composed of 1 battery pack, 1 vacuum air pump, 1 pressure accumulator bottle, 1 sound and light alarm, 1 power supply voltmeter, 1 sensor output voltmeter, 1 relay, 1 intermediate relay, 1 output pressure gauge, 1 pressure accumulator bottle pressure gauge, 1 pressure accumulator bottle pressure relief valve and 1 pressure regulating valve.

[0066] The modules in this device are as follows:

[0067] a. The battery pack has a rated voltage of 24V and a capacity of 9000mA, and is used to power each module in the chassis;

[0068] b. The vacuum air pump provides a pressure source for the test equipment (the output pressure is slightly higher than the operating pressure of the equipment under test);

[0069] c. The pressure accumulator bottle stores the output pressure of the vacuum air pump to ensure stable pressure.

[0070] d. Sound and light alarm, when the pressure value exceeds the alarm value, an alarm signal is issued

[0071] e. The power supply voltage meter displays the power supply voltage; the sensor output voltage meter displays the sensor output voltage

[0072] f. The pressure gauge of the pressure accumulator bottle displays the pressure of the pressure accumulator bottle; the output pressure gauge displays the inlet pressure of the sensor

[0073] g. The pressure relief valve of the pressure accumulator bottle is used to release excess pressure in the pressure accumulator bottle; the pressure regulating valve is used to stably adjust the output pressure to the working pressure.

[0074] A multi-purpose aircraft environmental control system bleed air pressure detection device of the present invention is described in detail with reference to the accompanying drawings:

[0075] (a) The main functions and features of the bleed air pressure detection device of the environmental control system of multi-purpose aircraft;

[0076] (a) Implement sensor non-disconnection function inspection.

[0077] (b) Check the engine bleed air function without running the engine

[0078] (c) The sensor circuit can be checked for circuit function without the need for a multimeter.

[0079] 1) The equipment is light in weight and small in size, making it easy to carry.

[0080] 2) The operation method is simple and the displayed data is intuitive and accurate.

[0081] 3) It has a wide range of applications and multiple usage scenarios. It can be used at aircraft flight sites and outdoor locations where there is no 220V power supply.

[0082] (II) Usage:

[0083] 1. Preparation before the test

[0084] 1.1 Open the relevant engine covers, disconnect the connecting pipes and cable plugs between the bleed air pressure sensor and the bleed air overpressure sensor and the aircraft, connect one end of the test cable to the sockets of the bleed air pressure sensor and the bleed air overpressure sensor, connect the other end of the test cable to the test socket on the box, connect one end of the test pipe to the input connecting pipe of the bleed air pressure sensor and the bleed air overpressure sensor, and connect the other end of the test pipe to the output interface on the box. 1.2 Turn on the power switch 23 on the box, the power supply voltmeter 3 indicates 24V, the sensor output voltmeter 4 indicates 0V, the pressure accumulator pressure gauge 6 and the output pressure gauge 7 indicate 0KPa, and the air pump standby indicator light 11 is on, indicating that the equipment is powered normally.

[0085] 1.3 Operators can use the equipment only after they have been trained and qualified. Inspection personnel must be present during the test.

[0086] 2 Power supply

[0087] 2.1 Equipment Power-On Operation

[0088] Press the start switch 9, the air pump working indicator light 10 lights up, the vacuum air pump 19 starts to work and pressurizes the pressure storage bottle 17, the pressure gauge 7 of the pressure storage bottle starts to indicate, and when the pressure reaches 500Kpa, the vacuum air pump 19 automatically stops working; during the pressurization process, press the stop switch 12 to manually stop the vacuum air pump, and the air pump standby indicator light 11 lights up, indicating that the air pump is in standby mode. 2.2 Equipment parameter setting

[0089] 2.2.1 Output pressure setting

[0090] Rotate the pressure regulating valve 5 clockwise, and the pressure accumulator 17 starts to output pressure gas source to the bleed air pressure sensor and the bleed air overpressure sensor. At this time, the sensor output voltage meter 4 shows that the pressure regulating valve 5 rotates clockwise to increase the pressure, counterclockwise to reduce the pressure, and the pressure is maintained if it does not move. Adjust the pressure to the corresponding working pressure of the bleed air pressure sensor and the bleed air overpressure sensor, respectively. The output pressure meter 6 shows the corresponding pressure, and the sensor output voltage meter 4 shows the corresponding voltage;

[0091] 2.2.2. When the pressure displayed on the output pressure gauge 6 reaches 213-264Kpa, the normal air intake indicator lights up, and the voltage indicated on the sensor output voltage gauge 4 meets 2710-3250mv±166.5mv, it means that the air intake pressure sensor is working normally, otherwise it is abnormal.

[0092] 2.2.3 When the pressure displayed on the output pressure gauge 6 reaches 440-460Kpa, the bleed air overpressure indicator light comes on. If the overpressure value is maintained for 15-30 seconds, the sound and light alarm 20 sends out an alarm signal, indicating that the bleed air overpressure sensor is working normally, otherwise it is abnormal.

[0093] 2.2.4 If the test data meets the technical requirements, open the pressure accumulator bottle pressure relief valve 8 to release the pressure of the pressure accumulator bottle. The test cable and test pipeline can be disconnected only when the pressure gauge 7 of the pressure accumulator bottle indicates 0.

[0094] 3. Test equipment charging

[0095] When the bleed air pressure detection device of the multi-purpose aircraft environmental control system has been idle for more than 3 months or the power supply voltage meter 3 indicates a voltage less than 22V after the power switch 23 is turned on, it should be charged. Connect the dedicated charger to the box charging interface 24 for charging.

[0096] 4. Post-test work

[0097] Turn off the power switch 23 on the box, the power supply voltmeter 3, sensor output voltmeter 4, pressure accumulator pressure gauge 6, output pressure gauge 7, and air pump standby indicator 11 are all off, indicating that the detection device is powered off. Disconnect the test cable and test pipeline from the socket and input connection pipeline of the bleed air pressure sensor and bleed air overpressure sensor respectively, and then disconnect them from the test socket 22 and output interface 21 on the box. Check the equipment and tools and clean up the excess items on site.

[0098] The present invention can provide a stable working air source for the bleed air pressure sensor and the bleed air overpressure sensor of the engine bleed air system in all states, and can quickly detect the working condition of the sensor without the engine being tested and the finished product being removed from the position. The external circuit of the sensor does not need to be measured by a multimeter for conduction measurement, and the working state of the sensor and the external circuit in the entire bleed air measurement system can be directly determined by directly using the set of devices. The inspection work of the bleed air pressure indication and alarm system can be completed quickly and efficiently, and various pressure indication inspections and overpressure alarm contents required by the documents can be met, without damaging the onboard equipment and protecting the safety of the finished aircraft, and the inspection contents required by the technical documents can be completed in full. The device completely simulates the bleed air output of the bleed air system, and has the functions of adjustable output pressure range, visual digital display of pressure value, overpressure protection alarm, etc. Control and protection are carried out from the hardware aspect, the safety of the onboard equipment is protected, the operation is simple and reliable, and the intuitive display of the digital display pressure value is realized. When the system fails or has problems, the purpose of inspection, elimination and detection can be achieved efficiently and quickly. Various problems that occur in the indication of the bleed air pressure system of the aircraft during flight can be solved. The equipment is light in weight and small in size, easy to carry. It is equipped with a rechargeable battery pack, a stable and reliable input gas source, and simple operation. It provides a reliable guarantee for aircraft commissioning, flight, and system troubleshooting. It can quantify and display input / output signals based on the data provided by the test equipment, effectively saving working time. It meets the requirements of aircraft production sites and field use.

Claims

1. A bleed air pressure detection device for a multi-purpose aircraft environmental control system, characterized in that: The device comprises: a power supply voltage meter (3), a sensor output voltage meter (4), an output pressure meter (6), a pressure accumulator bottle pressure meter (7), a vacuum air pump (19), a power switch (23), a battery pack (16), a start switch (9), a stop switch (12), an air bleed overpressure indicator light (1), an air bleed normal indicator light (2), an air pump working indicator light (10), an air pump standby indicator light (11), an audible and visual alarm (20), and a test socket (22); The positive electrode of the battery pack (16) is respectively connected to the power supply voltage meter (3), the sensor output voltage meter (4), the output pressure meter (6), the pressure meter of the pressure storage bottle (7), the sound and light alarm (20), the positive electrode of the intermediate relay, and the normally closed point of the relay through the power switch (23); The positive electrode of the battery pack (16) controls the relay to work and maintain self-locking through the power switch (23) and the start switch (9); after the relay works, the positive electricity passes from the positive electrode output point of the intermediate relay through the relay to the positive electrode of the vacuum air pump (19), and the positive and negative electrodes of the air pump working indicator light (10) are respectively connected to the positive and negative electrodes of the vacuum air pump (19); The positive electrode of the air pump standby indicator light (11) is connected to the normally closed point of the relay, and the negative electrode of the air pump standby indicator light (11) is connected to the negative electrode of the battery pack (16); The signal output end of the output pressure gauge (6) is respectively connected to the positive poles of the bleed air overpressure indicator light (1) and the bleed air normal indicator light (2), and the negative poles of the bleed air overpressure indicator light (1) and the bleed air normal indicator light (2) are connected to the negative pole of the battery pack (16); The voltage measuring end of the sensor output voltmeter (4) is connected to the test socket (22), and the test socket (22) is connected to the bleed air pressure sensor and the bleed air overpressure sensor on the machine through a test cable; The signal output terminal of the pressure accumulator bottle pressure gauge (7) is connected to the signal input point of the intermediate relay; The negative electrodes of the power supply voltage meter (3), the sensor output voltage meter (4), the output pressure meter (6), and the pressure storage bottle pressure meter (7) are respectively connected to the negative electrode of the battery pack (16); The negative pole of the sound and light alarm (20) is connected to the test socket (22).

2. A bleed air pressure detection device for a multi-purpose aircraft environmental control system according to claim 1, characterized in that: The device further comprises: a pressure regulating valve (5), a pressure accumulator bottle pressure relief valve (8), and an output interface (21); The vacuum air pump (19) pressurizes the pressure accumulator bottle (17) through the four-way valve, and the gas in the pressure accumulator bottle (17) reaches the pressure regulating valve (5) through the four-way valve and the one-way valve. The pressure regulating valve (5) is connected to the output interface (21) through the three-way valve to supply pressure to the onboard bleed air pressure sensor and the bleed air overpressure sensor; The three-way valve is connected to an output pressure gauge (6) for displaying the output pressure; The pressure gauge (7) of the pressure accumulator bottle is connected to the pressure accumulator bottle through the pressure accumulator bottle pressure relief valve (8) and the four-way valve, and is used for displaying the pressure of the pressure accumulator bottle.

3. A multi-purpose aircraft environmental control system bleed air pressure detection box, characterized in that: The detection box is based on the detection device according to any one of claims 1 to 2, and the detection box comprises: A portable all-aluminum alloy chassis is used as a carrier, and the interior is composed of at least a battery pack, a vacuum air pump, a pressure accumulator bottle, an audible and visual alarm, a power supply voltmeter, a sensor output voltmeter, a relay, an intermediate relay, an output pressure gauge, a pressure accumulator bottle pressure gauge, a pressure accumulator bottle pressure relief valve and a pressure regulating valve; a. The battery pack has a rated voltage of 24V and a capacity of 9000mA, and is used to power each module in the chassis; b. The vacuum air pump provides the pressure source for the test equipment; c. The pressure accumulator bottle stores the output pressure of the vacuum air pump to ensure stable pressure; d. Sound and light alarm, when the pressure value exceeds the alarm value, an alarm signal is issued; e. The power supply voltage meter displays the power supply voltage; the sensor output voltage meter displays the sensor output voltage; f. The pressure gauge of the pressure accumulator bottle displays the pressure of the pressure accumulator bottle; the output pressure gauge displays the inlet pressure of the sensor; g. The pressure relief valve of the pressure accumulator bottle is used to release excess pressure in the pressure accumulator bottle; the pressure regulating valve is used to stably adjust the output pressure to the working pressure.

4. A multi-purpose aircraft environmental control system bleed air pressure detection box according to claim 3, characterized in that: The box also includes: Rear cover (15); The rear cover plate (15) is provided with an output interface (21), a test socket (22), a power switch (23), and a charging interface (24); The charging interface (24) is used to charge the battery pack.

5. A method for using a bleed air pressure detection box for a multi-purpose aircraft environmental control system, characterized in that: The method of use is used for the box according to any one of claims 3 to 4, and the method comprises: Pre-test preparations; When the start switch (9) is pressed, the air pump working indicator light (10) lights up, the vacuum air pump (19) starts to work and pressurizes the pressure accumulator bottle (17), and the pressure gauge (7) of the pressure accumulator bottle starts to indicate that when the pressure reaches 500Kpa, the vacuum air pump (19) automatically stops working; during the pressurization process, the stop switch (12) is pressed to manually stop the vacuum air pump, and the air pump standby indicator light (11) lights up, indicating that the air pump is in standby mode; The pressure regulating valve (5) is rotated clockwise, and the pressure accumulator (17) starts to output the pressure gas source to the bleed air pressure sensor and the bleed air overpressure sensor. At this time, the sensor output voltage meter (4) shows that the pressure regulating valve (5) rotates clockwise to increase the pressure, and counterclockwise to reduce the pressure. If it does not move, the pressure is maintained; The pressure is adjusted to the corresponding working pressure of the bleed air pressure sensor and the bleed air overpressure sensor respectively, the output pressure gauge (6) displays the corresponding pressure, and the sensor output voltage gauge (4) displays the corresponding voltage; When the pressure displayed on the output pressure gauge (6) reaches 213-264Kpa, the normal air intake indicator lights up, and the voltage indicated by the sensor output voltage gauge (4) meets 2710-3250mv±166.5mv, it means that the air intake pressure sensor is working normally, otherwise it is abnormal; When the pressure displayed on the output pressure gauge (6) reaches 440-460Kpa, the bleed air overpressure indicator light turns on, and if the overpressure value is maintained for 15-30 seconds, the sound and light alarm (20) sends out an alarm signal, indicating that the bleed air overpressure sensor is working normally, otherwise it is abnormal.

6. The method for using the bleed air pressure detection box of a multi-purpose aircraft environmental control system according to claim 5, characterized in that: Pre-test preparations include: Open the relevant engine cover, disconnect the connection pipes and cable plugs between the bleed air pressure sensor and the bleed air overpressure sensor and the aircraft, connect one end of the test cable to the sockets of the bleed air pressure sensor and the bleed air overpressure sensor, connect the other end of the test cable to the test socket on the box, connect one end of the test pipe to the input interface of the bleed air pressure sensor and the bleed air overpressure sensor, and connect the other end of the test pipe to the output interface on the box; turn on the power switch (23) on the box, the power supply voltage meter (3) indicates 24V, the sensor output voltage meter (4) indicates 0V, the pressure accumulator pressure meter (6) and the output pressure meter (7) indicate 0KPa, and the air pump standby indicator light (11) is on, indicating that the equipment is powered normally.

7. The method for using the bleed air pressure detection box of a multi-purpose aircraft environmental control system according to claim 5, characterized in that: The method further comprises: After the test is completed, the pressure relief valve (8) is opened to release the pressure from the pressure accumulator bottle. The test cable and the test pipeline can be disconnected only when the pressure gauge (7) of the pressure accumulator bottle indicates zero.

8. The method for using the bleed air pressure detection box of a multi-purpose aircraft environmental control system according to claim 5, characterized in that: The method further comprises: After the power switch (23) of the bleed air pressure detection box of the multi-purpose aircraft environmental control system is turned on and the voltage indicated by the power voltage meter (3) is less than 22V, the box should be charged. The dedicated charger is connected to the box charging interface (24) for charging.

Images