Aircraft fuel tank sealing detection air charging control device in extreme climate environment

Abstract

The invention belongs to the technical field of extreme climatic environment aircraft fuel tank sealing detection, and particularly relates to an extreme climatic environment aircraft fuel tank sealing detection air charging control device which can tolerate the extreme climatic environment in a climate laboratory. The device can be arranged on a wing with an oil tank nearby, after the oil tank is fully soaked in extreme climate environments such as low temperature, high temperature and solar radiation, the oil tank can be inflated and deflated according to a pressure spectrum, and pressurization, pressure maintaining and pressure relief of the oil tank are accurately and reliably completed.

Description

Technical Field

[0001] The present application belongs to the technical field of fuel tank seal detection for aircraft in extreme climate environments, and in particular relates to an air pressurization control device for fuel tank seal detection for aircraft in extreme climate environments. Background Art

[0002] The internal space of the wing box section of modern large aircraft is large, and the space of the wing box section is often used to arrange the fuel tank. The sealing of the fuel tank has a significant impact on the safe operation of the aircraft. Fuel leakage will affect the structural integrity of the aircraft. Minor leakage will increase the maintenance work and maintenance costs. Major leakage will also cause the aircraft to catch fire or lose control of the aircraft. Therefore, detailed sealing design should be carried out in the aircraft structure design, and a good structural sealing process and appropriate sealant should be selected. Since aircraft operations often encounter extreme climate environments such as low temperature, high temperature, and solar radiation, the sealing process and sealant used in the fuel tank are required to be able to withstand the highest and lowest fuel temperatures and ambient temperatures that may be encountered in actual use. Within the storage and operating temperatures, the sealing process will not fail, and the sealant should not crack or lose viscosity, which may cause leakage in the fuel tank or reduce the service life.

[0003] In order to verify the sealing performance of the fuel tank, the fuel tank is usually placed in a low-temperature or high-temperature environment chamber for immersion, and air is pressurized inside the fuel tank for a certain period of time to check for leakage, liquid leakage and deformation of the fuel tank, and to examine whether the air tightness of the fuel tank can meet the design and use requirements. However, in the actual use of the aircraft, it was found that since the fuel tank is placed in the wing of the aircraft, after the aircraft as a whole is immersed in extreme climate environments such as low temperature, high temperature, and solar radiation, the temperature environment faced by the fuel tank inside the wing is lower or higher than the temperature of the fuel tank directly exposed to the extreme climate environment. Therefore, in order to more accurately verify the air tightness of the fuel tank, the wing with the fuel tank is now placed in a climate laboratory, so that the aircraft wing is immersed in low temperature, high temperature, and solar radiation environments, and then the fuel tank is pressurized with air using an air pressurization device to test the sealing.

[0004] In the past, the verification method immersed the fuel tank in the environmental chamber, and the air pressure control device was set outside the environmental chamber. When the fuel tank seal test was carried out in the climate laboratory, the wing with the fuel tank was placed in the climate laboratory as a whole, and the air pressure control device needed to be arranged next to the wing. The reasons for this arrangement are: first, to reduce the distance between the connecting pipe between the pressure sensor and the fuel tank, and improve the accuracy of the internal pressure detection of the fuel tank; second, when the fuel tank pressure exceeds the limit, the closer the exhaust pipe and the control device are to the fuel tank, the faster the exhaust speed, ensuring the safety of the fuel tank. Therefore, the air pressure control device that was previously arranged outside the environmental chamber cannot withstand extreme environments such as high temperature, low temperature, and solar radiation when used in the climate laboratory. The air intake pipe is not treated with low dew point air dehumidification, which is easy to cause condensation, ice, freezing and expansion leakage in the low temperature environment of the fuel tank. At the same time, the protection measures for the over-limit of the fuel tank pressure are single, and it is impossible to ensure the smooth implementation of the fuel tank seal test in extreme climate environments.

[0005] This application is proposed in view of the above-mentioned technical defects. Summary of the invention

[0006] The purpose of the present application is to provide an air pressurization control device for detecting the seal of an aircraft fuel tank in an extreme climate environment, so as to overcome or alleviate at least one aspect of the known technical defects.

[0007] The technical solution of this application is:

[0008] An air pressure control device for detecting the sealing of an aircraft fuel tank in an extreme climate environment, comprising an inflation cabinet, an exhaust cabinet, an air cooling diffuser for the inflation cabinet, an electric heater for the inflation cabinet, an air cooling diffuser for the exhaust cabinet, an electric heater for the exhaust cabinet, an air source access pipeline, an inflation branch, an exhaust pipeline, a slope control exhaust branch, a switch control exhaust branch, a manually controlled exhaust branch, and a pneumatic valve air supply branch;

[0009] The inflatable cabinet and the exhaust cabinet are set in the climate laboratory, close to the wing with the fuel tank in the climate laboratory; the inflatable cabinet air cooling diffuser and the inflatable cabinet electric heater are set in the inflatable cabinet, and the exhaust cabinet air cooling diffuser and the exhaust cabinet electric heater are set in the exhaust cabinet;

[0010] The gas source access pipeline is arranged in the inflatable cabinet, and the inlet passes through the inflatable cabinet and is connected to the compressed air source;

[0011] The inflation branch is set in the inflation cabinet, the inlet is connected to the gas source access pipeline outlet, and the outlet is connected to the oil tank, on which an inflation control pressure reducing valve, an inflation control pneumatic switch valve, and an inflation control pneumatic regulating valve are arranged;

[0012] The exhaust pipeline is set in the exhaust cabinet, and the inlet is connected to the oil tank;

[0013] The slope-controlled exhaust branch is set in the exhaust cabinet, the inlet is connected to the exhaust pipeline outlet, and the outlet passes through the exhaust cabinet, on which the oil tank pressure transmitter and the slope-controlled exhaust pneumatic regulating valve are set;

[0014] The switch-controlled exhaust branch is arranged in the exhaust cabinet, the inlet is connected to the exhaust pipe outlet, and the outlet is connected to the slope-controlled exhaust branch, on which an exhaust-control pneumatic switch valve is arranged;

[0015] The manually controlled exhaust branch is set in the exhaust cabinet, the inlet is connected to the exhaust pipeline outlet, and the outlet is connected to the slope controlled exhaust branch, on which an exhaust control manual valve is set;

[0016] The pneumatic valve air supply branch is arranged in the inflation cabinet, the inlet is connected to the outlet of the air source access pipeline, the outlet passes through the inflation cabinet and extends into the exhaust cabinet, and is provided with an air branch control pressure reducing valve, which is connected to the inflation cabinet air-cooling diffuser and the exhaust cabinet air-cooling diffuser through a bypass, and the bypass connecting the inflation cabinet air-cooling diffuser and the exhaust cabinet air-cooling diffuser is provided with an inflation cabinet air-cooling diffuser control pneumatic switch valve and an exhaust cabinet air-cooling diffuser control pneumatic switch valve.

[0017] According to at least one embodiment of the present application, in the above-mentioned extreme climate environment aircraft tank seal detection air charging control device, a dryer and an air source pressure indicating pressure gauge are provided on the air source access pipeline.

[0018] According to at least one embodiment of the present application, in the above-mentioned extreme climate environment aircraft tank seal detection air pressurization control device, an inflation branch is also provided with an inflation control manual valve, an inflation control pneumatic regulating valve, an inflation branch indicating pressure gauge, and an inflation branch pressure transmitter.

[0019] According to at least one embodiment of the present application, in the above-mentioned extreme climate environment aircraft tank seal detection air charging control device, a tank pressure indicating pressure gauge is also provided on the slope control exhaust branch.

[0020] According to at least one embodiment of the present application, in the above-mentioned extreme climate environment aircraft tank seal detection air pressurization control device, the pneumatic valve air supply branch is connected to the inflation control pneumatic switch valve, the inflation control pneumatic regulating valve, the slope control exhaust pneumatic regulating valve, the exhaust control pneumatic switch valve, the inflation cabinet air-cooled diffuser control pneumatic switch valve, and the exhaust cabinet air-cooled diffuser control pneumatic switch valve through a small branch.

[0021] This application has at least the following beneficial technical effects:

[0022] Provided is an air pressurization control device for detecting fuel tank seals in aircraft under extreme climate environments. The device can withstand extreme climate environments in climate laboratories. When conducting a fuel tank seal test on an aircraft wing under extreme climate environments, the device can be arranged near a wing with a fuel tank. After the fuel tank has been fully immersed in extreme climate environments such as low temperature, high temperature, and solar radiation, the fuel tank can be inflated and exhausted according to a pressure spectrum, thereby accurately and reliably completing fuel tank pressurization, pressure maintenance, and pressure relief. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of an air pressurization control device for detecting a seal of an aircraft fuel tank in an extreme climate environment provided by an embodiment of the present application;

[0024] in:

[0025] 1-Inflatable cabinet; 2-Exhaust cabinet; 3-Wing fuel tank with; 4-Climate laboratory; 5-Inflatable cabinet air cooling diffuser; 6-Inflatable cabinet electric heater; 7-Exhaust cabinet air cooling diffuser; 8-Exhaust cabinet electric heater; 9-Air source access pipeline; 10-Dryer; 11-Air source pressure indicating pressure gauge; 12-Pneumatic valve air supply branch control manual valve; 13-Filter; 14-Pneumatic valve air supply branch control pressure reducing valve; 15-Pneumatic valve air supply branch indicating pressure gauge; 16-Pneumatic valve air supply branch pressure transmitter; 17-Pneumatic valve air supply branch; 18-Inflation control manual valve; 19-Inflation control pressure reducing Valve; 20-inflation control pneumatic switch valve; 21-inflation control pneumatic regulating valve; 22-inflation branch indicating pressure gauge; 23-inflation branch pressure transmitter; 24-tank pressure indicating pressure gauge; 25-tank pressure transmitter; 26-slope control exhaust pneumatic regulating valve; 27-exhaust control pneumatic switch valve; 28-exhaust control manual valve; 29-slope control exhaust branch; 30-inflation cabinet air-cooled diffuser control pneumatic switch valve; 31-exhaust cabinet air-cooled diffuser control pneumatic switch valve; 32-inflation branch; 33-exhaust pipeline; 34-switch control exhaust branch; 35-manual control exhaust branch.

[0026] In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. In addition, the drawings are only used for illustrative purposes and should not be construed as limitations on the present application. DETAILED DESCRIPTION

[0027] In order to make the technical solution and advantages of the present application clearer, the technical solution of the present application will be described in further detail in detail and in detail with reference to the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present application, which are only used to explain the present application, not to limit the present application. It should be noted that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design.

[0028] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of this application shall have the usual meanings understood by those of ordinary skill in the art to which this application belongs. The words used in the description of this application to indicate orientation are only used to indicate relative directions or positional relationships. When the absolute position of the described object changes, its relative positional relationship may also change accordingly. The word "include" used in the description of this application indicates that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, but does not exclude other elements or objects.

[0029] In addition, it should be noted that, unless otherwise clearly specified and limited, the words "installation", "connection" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Technical personnel in the field can understand its specific meaning in this application according to the specific circumstances.

[0030] An air pressure control device for detecting the sealing of an aircraft fuel tank in an extreme climate environment, such as Figure 1 As shown, it includes an inflation cabinet 1, an exhaust cabinet 2, an inflation cabinet air-cooling diffuser 5, an inflation cabinet electric heater 6, an exhaust cabinet air-cooling diffuser 7, an exhaust cabinet electric heater 8, an air source access pipeline 9, an inflation branch 32, an exhaust pipeline 33, a slope-controlled exhaust branch 29, a switch-controlled exhaust branch 34, a manually-controlled exhaust branch 35, and a pneumatic valve air supply branch 17.

[0031] The inflation cabinet 1 and the exhaust cabinet 2 are arranged in the climate laboratory 4 , close to the wing 3 with the fuel tank in the climate laboratory 4 .

[0032] The air-cooling diffuser 5 and the electric heater 6 of the inflating cabinet are arranged in the inflating cabinet 1 , and the air-cooling diffuser 7 and the electric heater 8 of the exhaust cabinet are arranged in the exhaust cabinet 2 .

[0033] The gas source access pipeline 9 is arranged in the inflation cabinet 1, and the inlet passes through the inflation cabinet 1 to connect with the compressed air source, and can also further pass through the climate laboratory 4 to connect with the compressed air source, and a dryer 10 and a gas source pressure indicating pressure gauge 11 are arranged thereon in sequence.

[0034] The inflation branch 32 is arranged in the inflation cabinet 1, with the inlet connected to the outlet of the gas source access pipeline 9, and the outlet connected to the oil tank, on which are arranged in sequence an inflation control manual valve 18, an inflation control pressure reducing valve 19, an inflation control pneumatic switch valve 20, an inflation control pneumatic regulating valve 21, an inflation branch indicating pressure gauge 22, and an inflation branch pressure transmitter 23.

[0035] The exhaust pipeline 33 is arranged in the exhaust cabinet 2, and the inlet is connected to the oil tank.

[0036] The slope-controlled exhaust branch 29 is arranged in the exhaust cabinet 2, and its inlet is connected to the outlet of the exhaust pipeline 33. The outlet passes through the exhaust cabinet 2 and can also further pass through the climate laboratory 4. The oil tank pressure indicating pressure gauge 24, the oil tank pressure transmitter 25, and the slope-controlled exhaust pneumatic regulating valve 26 are arranged thereon in sequence.

[0037] The switch-controlled exhaust branch 34 is arranged in the exhaust cabinet 2, the inlet of which is connected to the outlet of the exhaust pipeline 33, and the outlet is connected to the slope-controlled exhaust branch 29, on which the exhaust-controlled pneumatic switch valve 27 is arranged.

[0038] The manually controlled exhaust branch 35 is arranged in the exhaust cabinet 2, the inlet of which is connected to the outlet of the exhaust pipeline 33, and the outlet is connected to the slope controlled exhaust branch 29, on which the exhaust control manual valve 28 is arranged.

[0039] A pneumatic valve air supply branch 17 is arranged in the inflation cabinet 1, with its inlet connected to the outlet of the air source access pipeline 9, and its outlet passes through the inflation cabinet 1 and extends into the exhaust cabinet 2, on which are arranged in sequence a pneumatic valve air supply branch control manual valve 12, a filter 13, a pneumatic valve air supply branch control pressure reducing valve 14, a pneumatic valve air supply branch indicating pressure gauge 15, and a pneumatic valve air supply branch pressure transmitter 16. The pneumatic valve air supply branch 17 is connected to the inflation cabinet air-cooling diffuser 5 and the exhaust cabinet air-cooling diffuser 7 through a bypass, and the bypass connecting the inflation cabinet air-cooling diffuser 5 and the exhaust cabinet air-cooling diffuser 7 is provided with an inflation cabinet air-cooling diffuser device control pneumatic switch valve 30 and an exhaust cabinet air-cooling diffuser device control pneumatic switch valve 31.

[0040] The pneumatic valve air supply branch 17 is connected to the inflation control pneumatic switch valve 20, the inflation control pneumatic regulating valve 21, the slope control exhaust pneumatic regulating valve 26, the exhaust control pneumatic switch valve 27, the inflation cabinet air-cooled diffuser control pneumatic switch valve 30, and the exhaust cabinet air-cooled diffuser control pneumatic switch valve 31 through a small branch.

[0041] The air pressurization control device for sealing detection of aircraft fuel tanks in extreme climate environments disclosed in the above-mentioned embodiment can be divided into two parts: an inflation device and an exhaust device. The inflation device mainly includes an inflation cabinet 1, an inflation cabinet air-cooled diffuser 5, an inflation cabinet electric heater 6, an air source access pipeline 9, an inflation branch 32, a pneumatic valve air supply branch 17 and related accessories; the exhaust device mainly includes an exhaust cabinet 2, an exhaust cabinet air-cooled diffuser 7, an exhaust cabinet electric heater 8, an exhaust pipeline 33, a slope-controlled exhaust branch 29, a switch-controlled exhaust branch 34, a manually-controlled exhaust branch 35 and related accessories. Through the coordinated control of the inflation device and the exhaust device, the internal pressure of the fuel tank changes according to the pressure test spectrum, thereby completing the fuel tank pressurization, pressure maintenance and pressure relief.

[0042] The charging device is used to process the compressed air of the air source to a dew point temperature of -40°C and a charging pressure of 0.2MPa to 0.8MPa.

[0043] The inlet of the air source access pipeline 9 passes through the inflator cabinet 1 and is connected to the compressed air source, and the compressed air can be connected to the inflator. The dryer 10 can process the compressed air to a dew point temperature of -40°C.

[0044] The compressed air pressure on the charging branch 32 can be adjusted to 0.2MPa-0.8MPa through the charging control pressure reducing valve 19, the opening of the charging control pneumatic regulating valve 21 can be controlled, and the punching rate of the oil tank can be controlled according to the charging-time curve.

[0045] The compressed air can be decompressed to 0.6MPa through the pneumatic valve air supply branch 17 to supply air to the pneumatic valves in the inflation device and the exhaust device, including an inflation control pneumatic switch valve 20, an inflation control pneumatic regulating valve 21, a slope control exhaust pneumatic regulating valve 26, an exhaust control pneumatic switch valve 27, an inflation cabinet air-cooled diffuser device control pneumatic switch valve 30, and an exhaust cabinet air-cooled diffuser device control pneumatic switch valve 31.

[0046] The electric heater 6 of the inflatable cabinet can be activated in the low temperature environment of the climate laboratory 4 to maintain the interior of the inflatable device cabinet 1 at 20°C to 30°C.

[0047] The air-cooled diffuser 5 of the inflatable cabinet can be activated in the high temperature environment of the climate laboratory 4. The pneumatic valve air supply branch 17 branches off a compressed air path to supply the air-cooled diffuser 5 of the inflatable cabinet. The interior of the inflatable device cabinet 1 can be kept at 20°C to 30°C by the compressed air at room temperature.

[0048] The exhaust device is used to control the pressure relief rate after the oil tank pressure maintenance is completed, or to provide emergency pressure relief after the pressure in the oil tank exceeds the limit.

[0049] The slope-controlled exhaust branch 29 can control the opening of the exhaust pneumatic regulating valve 26 by controlling the slope, and control the pressure relief rate in the oil tank according to the pressure relief-time curve.

[0050] The switch-controlled exhaust branch 34 can quickly release the pressure of the oil tank by opening the exhaust control pneumatic switch valve 27 .

[0051] The exhaust control manual valve 28 can be opened on the manually controlled exhaust branch 35 to quickly release the pressure on the oil tank.

[0052] The exhaust cabinet electric heater 8 can be activated in the low temperature environment of the climate laboratory 4 to maintain the interior of the exhaust device cabinet 2 at 20°C to 30°C.

[0053] The exhaust cabinet air-cooled diffuser 7 can be activated in the high temperature environment of the climate laboratory 4. The pneumatic valve air supply branch 17 branches off a compressed air path to supply the exhaust cabinet air-cooled diffuser 7. The interior of the exhaust device cabinet 2 can be kept at 20°C to 30°C by compressed air at room temperature.

[0054] The air pressure control device for detecting the sealing of an aircraft fuel tank in an extreme climate environment disclosed in the above embodiment can be specifically applied as follows when carrying out a fuel tank sealing detection test in an extreme climate environment in a climate laboratory 4:

[0055] The inflation cabinet 1 and the exhaust cabinet 2 are arranged near the wing 3 with the fuel tank, close to the fuel tank.

[0056] The inflatable cabinet 1 is connected to a compressed air source through an air source access pipeline 9, and the compressed air is treated to a dew point temperature of -40°C through a dryer 10. The pressure of the compressed air after drying can be observed through an air source pressure indicating pressure gauge 11.

[0057] A pneumatic valve air supply branch 17 is provided in the inflation cabinet 1. When the pneumatic valve air supply branch control manual valve 12 is opened, the compressed air can be reduced to 0.6MPa through the filter 13 and the pneumatic valve air supply branch control pressure reducing valve 14, that is, the air pressure in the pneumatic valve air supply branch 17 is 0.6MPa, which is supplied to the pneumatic valves inside the inflation cabinet 1 and the exhaust cabinet 2. The pressure of the pneumatic valve air supply branch 17 can be monitored by the pneumatic valve air supply branch indicating pressure gauge 15 and the pneumatic valve air supply branch pressure transmitter 16.

[0058] An inflatable cabinet air-cooling diffuser 5 is provided in the inflatable cabinet 1, and the inflatable cabinet air-cooling diffuser 5 is connected to the pneumatic valve air supply branch 17. When the climate laboratory 4 is in a high temperature environment above 40°C, the inflatable cabinet air-cooling diffuser 5 can be opened to control the pneumatic switch valve 30, and the interior of the inflatable cabinet 1 can be maintained at 20°C to 30°C by compressed air at normal temperature.

[0059] An inflatable cabinet electric heater 6 is provided in the inflatable cabinet 1. When the climate laboratory 4 is in a low temperature environment below 0°C, the inflatable cabinet electric heater 6 can be turned on to maintain the interior of the inflatable cabinet 1 at 20°C to 30°C.

[0060] An exhaust cabinet air-cooling diffuser 7 is provided in the exhaust cabinet 2, and the exhaust cabinet air-cooling diffuser 7 is connected to the pneumatic valve air supply branch 17. When the climate laboratory 4 is in a high temperature environment above 40°C, the exhaust cabinet air-cooling diffuser 7 can be opened to control the pneumatic switch valve 31, and the interior of the exhaust cabinet 2 can be kept at 20°C to 30°C by compressed air at normal temperature.

[0061] An exhaust cabinet electric heater 8 is provided in the exhaust cabinet 2. When the climate laboratory 4 is in a low temperature environment below 0°C, the exhaust cabinet electric heater 8 can be turned on to maintain the interior of the exhaust cabinet 2 at 20°C to 30°C.

[0062] When the oil tank starts to be charged, the charging control hand valve 18 and the charging control pressure reducing valve 19 adjust the compressed air pressure to 0.2MPa-0.8MPa, open the charging control pneumatic switch valve 20, close the slope control exhaust pneumatic regulating valve 26, exhaust control pneumatic switch valve 27, and exhaust control hand valve 28 in the exhaust cabinet 2, and use the monitor to use the detection value of the oil tank pressure transmitter 25 as the oil tank pressure control feedback value, and control the charging rate of the oil tank by adjusting the opening of the charging control pneumatic regulating valve 21 in the charging cabinet 1. The pressure of the charging branch 32 can be monitored by the charging branch indicating pressure gauge 22 and the charging branch pressure transmitter 23, and the oil tank pressure can be monitored by the oil tank pressure indicating pressure gauge 24 and the oil tank pressure transmitter 25.

[0063] When the oil tank needs to be depressurized, close the inflation control pneumatic switch valve 20 and the inflation control pneumatic regulating valve 21 in the inflation cabinet 1, close the exhaust control pneumatic switch valve 27 and the exhaust control manual valve 28 in the exhaust cabinet 2, and use the monitor to take the detection value of the oil tank pressure transmitter 25 as the oil tank pressure control feedback value, and control the opening of the exhaust pneumatic regulating valve 26 by adjusting the slope to control the pressure relief rate of the oil tank.

[0064] When emergency pressure relief is required for the fuel tank, close the inflation control pneumatic switch valve 20 and the inflation control pneumatic regulating valve 21 in the inflation cabinet 1, and perform emergency pressure relief on the slope control exhaust pneumatic regulating valve 26 and the exhaust control pneumatic switch valve 27 in the exhaust cabinet 2. Emergency pressure relief can also be performed by opening the exhaust control manual valve 28.

[0065] The extreme climate environment aircraft fuel tank seal detection air pressure control device disclosed in the above embodiment has the following advantages:

[0066] Equipped with an air-cooled diffuser 5 for the inflatable cabinet, an electric heater 6 for the inflatable cabinet, an air-cooled diffuser 7 for the exhaust cabinet, and an electric heater 8 for the exhaust cabinet, the inflatable cabinet 1 and the exhaust cabinet 2 can maintain the temperature at 20°C to 30°C, and can withstand the extreme environment in the climate laboratory 4. They can be arranged near the oil tank in the climate laboratory 4, reducing the distance between the connecting pipeline between the oil tank pressure transmitter 25 and the oil tank, improving the detection accuracy of the internal pressure of the oil tank, and when the oil tank pressure exceeds the limit, the exhaust-related pipelines and control devices are close to the oil tank, and can be exhausted at a faster speed, which can effectively ensure the safety of the oil tank sealing detection test;

[0067] The design has a triple over-pressure protection measure for the oil tank. When the oil tank pressure exceeds the limit, it can be relieved through three pressure relief methods. The first is to control the opening of the exhaust pneumatic regulating valve 26 by controlling the slope to release the pressure by slope control. The second is to quickly release the pressure by opening the exhaust control pneumatic switch valve 27. The third is to manually release the pressure by opening the exhaust control manual valve 28.

[0068] It supports two control modes of automatic and manual charging and pressure relief. One is that the charging and pressure relief rates of the oil tank can be automatically controlled by the charging control pneumatic regulating valve 21 and the slope control exhaust pneumatic regulating valve 26 according to the charging-time curve and the pressure relief-time curve. The other is that the charging control pneumatic switch valve 20, the charging control pneumatic regulating valve 21 and the slope control exhaust pneumatic regulating valve 26 can be manually controlled to manually charge and relieve the pressure of the oil tank.

[0069] The compressed air intake is dehumidified and a dryer 10 is arranged on the air source access pipeline 9, so that the compressed air can be treated to a dew point temperature of -40°C, thereby reducing the risk of condensation, freezing and expansion of the compressed air when the oil tank is immersed in a low-temperature environment.

[0070] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the scope of protection of the present application.

Claims

1. An air pressure control device for detecting the sealing of an aircraft fuel tank in an extreme climate environment, characterized in that: It comprises an inflation cabinet (1), an exhaust cabinet (2), an inflation cabinet air cooling diffuser (5), an inflation cabinet electric heater (6), an exhaust cabinet air cooling diffuser (7), an exhaust cabinet electric heater (8), an air source access pipeline (9), an inflation branch (32), an exhaust pipeline (33), a slope control exhaust branch (29), a switch control exhaust branch (34), a manually controlled exhaust branch (35), and a pneumatic valve air supply branch (17); An inflatable cabinet (1) and an exhaust cabinet (2) are arranged in a climate laboratory (4), close to a wing (3) with an oil tank in the climate laboratory (4); an inflatable cabinet air cooling diffuser (5) and an inflatable cabinet electric heater (6) are arranged in the inflatable cabinet (1), and an exhaust cabinet air cooling diffuser (7) and an exhaust cabinet electric heater (8) are arranged in the exhaust cabinet (2); An air source access pipeline (9) is arranged in the inflatable cabinet (1), and an inlet passes through the inflatable cabinet (1) and is connected to a compressed air source; The inflation branch (32) is arranged in the inflation cabinet (1), the inlet of which is connected to the outlet of the gas source access pipeline (9), and the outlet of which is connected to the oil tank, and an inflation control pressure reducing valve (19), an inflation control pneumatic switch valve (20), and an inflation control pneumatic regulating valve (21) are arranged on the inflation branch; An exhaust pipeline (33) is arranged in the exhaust cabinet (2), and an inlet is connected to the oil tank; The slope-controlled exhaust branch (29) is arranged in the exhaust cabinet (2), the inlet of which is connected to the outlet of the exhaust pipeline (33), and the outlet passes through the exhaust cabinet (2), and is provided with an oil tank pressure transmitter (25) and a slope-controlled exhaust pneumatic regulating valve (26); The switch-controlled exhaust branch (34) is arranged in the exhaust cabinet (2), the inlet of which is connected to the outlet of the exhaust pipeline (33), and the outlet of which is connected to the slope-controlled exhaust branch (29), on which an exhaust-controlled pneumatic switch valve (27) is arranged; A manually controlled exhaust branch (35) is arranged in the exhaust cabinet (2), the inlet of which is connected to the outlet of the exhaust pipeline (33), and the outlet of which is connected to the slope controlled exhaust branch (29), on which an exhaust control manual valve (28) is arranged; The pneumatic valve air supply branch (17) is arranged in the inflation cabinet (1), the inlet of which is connected to the outlet of the air source access pipeline (9), the outlet of which passes through the inflation cabinet (1) and extends into the exhaust cabinet (2), and an air branch control pressure reducing valve (14) is arranged on the pneumatic valve supply branch. The pneumatic valve supply branch (17) is connected to the inflation cabinet air cooling diffuser (5) and the exhaust cabinet air cooling diffuser (7) through a bypass. The bypass connecting the inflation cabinet air cooling diffuser (5) and the exhaust cabinet air cooling diffuser (7) is provided with an inflation cabinet air cooling diffuser control pneumatic switch valve (30) and an exhaust cabinet air cooling diffuser control pneumatic switch valve (31).

2. The air pressure control device for detecting the sealing of an aircraft fuel tank in an extreme climate environment according to claim 1 is characterized in that: A dryer (10) and a gas source pressure indicating pressure gauge (11) are arranged on the gas source access pipeline (9).

3. The air pressure control device for detecting the sealing of an aircraft fuel tank in an extreme climate environment according to claim 1 is characterized in that: The inflation branch circuit (32) is also provided with an inflation control manual valve (18), an inflation control pneumatic regulating valve (21), an inflation branch circuit indicating pressure gauge (22), and an inflation branch circuit pressure transmitter (23).

4. The air pressure control device for detecting the sealing of an aircraft fuel tank in an extreme climate environment according to claim 1 is characterized in that: The slope control exhaust branch (29) is also provided with a fuel tank pressure indicating pressure gauge (24).

5. The air pressure control device for detecting the sealing of an aircraft fuel tank in an extreme climate environment according to claim 1 is characterized in that: The pneumatic valve air supply branch (17) is connected to the inflation control pneumatic switch valve (20), the inflation control pneumatic regulating valve (21), the slope control exhaust pneumatic regulating valve (26), the exhaust control pneumatic switch valve (27), the inflation cabinet air cooling diffuser control pneumatic switch valve (30), and the exhaust cabinet air cooling diffuser control pneumatic switch valve (31) through a small branch.

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