A line leak test device and method for an airborne refrigeration component

Abstract

The application discloses a kind of pipeline leakage test device and test method of airborne refrigeration component, including helium leak detector, tool table, vacuum cavity, the helium leak detector, gas circuit module and control cabinet, the gas circuit module includes first vacuum pump, second vacuum pump, liquid accumulator and the pipeline system with pressure gauge, pressure regulator, adjustable pressure relief valve and valve for being connected with the vacuum cavity, airborne refrigeration component, control cabinet includes industrial computer, data acquisition module, adjustable DC power supply and monitor, the data acquisition module acquires pressure regulator, adjustable pressure relief valve and valve state data, acquires pressure gauge pressure information, acquires leakage data detected by helium leak detector and is fed back to industrial computer, the industrial computer is connected adjustable DC power supply, first vacuum pump, second vacuum pump, each valve and monitor, for monitoring, control and display test process.The application can meet the needs of a variety of airborne refrigeration component pipeline leakage test.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of pipeline leakage test device and test method of airborne refrigeration component. BACKGROUND

[0002] Civil aviation technology tends to integration and automation, and the components of aircraft assembly are generally more integrated, and the development technology is more closed. Among them, in the maintenance and development process of airborne refrigeration system components, pipeline leakage test of different refrigeration components has different requirements for test devices, such as large leakage test, helium leakage test of PECS / ICS of Boeing aircraft, SCU heat exchanger loop leakage test, and leakage test of air conditioner and refrigerator on the aircraft. Among them, PECS refers to electronic power cooling system, ICS refers to integrated cooling system, and SCU refers to supplementary cooling assembly system. The existing pipeline leakage test equipment cannot meet the needs of pipeline leakage test of various refrigeration components, and there is an urgent need for a pipeline leakage test device compatible with the requirements of different airborne refrigeration components. SUMMARY

[0003] The purpose of the present application is to provide a kind of pipeline leakage test device of airborne refrigeration component, can meet the needs of pipeline leakage test of various airborne refrigeration components, without needing to design corresponding test device for different airborne refrigeration components separately, can reduce development investment.

[0004] The purpose of the present application can be realized by the following technical solutions.

[0005] A kind of pipeline leakage test device of airborne refrigeration component, including helium leak detector and the tooling table for placing the helium leak detector, further comprising:

[0006] Openable and closable vacuum cavity, for placing the airborne refrigeration component to be tested, the vacuum cavity is communicated with the helium leak detector by pipeline with valve;

[0007] The gas circuit module comprises a first vacuum pump, a second vacuum pump, a liquid accumulator and a pipeline system with pressure gauges, pressure regulators, adjustable pressure relief valves and valves for connecting the vacuum chamber, the on-board refrigeration component, wherein the first vacuum pump is connected to the vacuum chamber through a pipeline with a valve for vacuumizing the vacuum chamber, the pipeline inlet or the pipeline outlet of the on-board refrigeration component is connected to the liquid accumulator through a pipeline with a first pressure gauge, a first valve and a three-way valve, the liquid accumulator is connected to the second vacuum pump through a pipeline, air and residual refrigerant in the on-board refrigeration component are extracted through the second vacuum pump, the extracted residual refrigerant is stored in the liquid accumulator, the first pressure gauge is used for detecting the internal pressure of the pipeline of the on-board refrigeration component, another valve port of the three-way valve is connected to a parallel air source branch, a helium source branch and an on-board refrigeration component exhaust branch, the vacuum chamber is connected to a first exhaust port through a pipeline with a first adjustable pressure relief valve and a valve, the air source branch fills air into the on-board refrigeration component through a pipeline connected to an air source and provided with a first pressure regulator and a first air filter and a pipeline between the three-way valve and the on-board refrigeration component, the helium source branch fills helium into the on-board refrigeration component through a pipeline connected to a helium source and provided with a second pressure regulator, a second adjustable pressure relief valve and a second air filter and a pipeline between the three-way valve and the on-board refrigeration component, and the on-board refrigeration component exhaust branch is provided with a second exhaust port.

[0008] The control cabinet comprises an industrial computer, a data acquisition module, an adjustable DC power supply and a monitor, the data acquisition module acquires state data of the pressure regulator, the adjustable pressure relief valve and the valve, acquires pressure information of the pressure gauge, acquires leakage data detected by the helium leak detector and feeds back to the industrial computer, the industrial computer is connected to the adjustable DC power supply, the first vacuum pump, the second vacuum pump, each valve and the monitor, and is used for monitoring, controlling and displaying the test process.

[0009] The vacuum pressure method is adopted to test the on-board refrigeration component, the test precision of pipeline leakage is improved, the pipeline integrity of the on-board refrigeration component is ensured, the flight safety and system stable operation of the civil aircraft are provided with strong guarantee, the vacuum chamber is connected to various pipelines in various ways, the pipeline leakage test device of the on-board refrigeration component can be adapted to different on-board refrigeration components, the development and investment of multiple test devices are avoided, the occupied area is small, the cost is saved, and the related test requirements of different on-board refrigeration components can be met at the same time through one test device.

[0010] The application further comprises an assembly vehicle for transporting an airborne refrigeration component, the assembly vehicle comprising a movable lifting platform, support columns erected on both sides of the lifting platform, an assembly frame installed between the support columns on both sides, both ends of the assembly frame being rotatably connected to the support columns through connecting rods and rotating rods, the assembly frame being fixedly connected to the airborne refrigeration component through a connecting assembly, the rotating rods being connected to a driving component for driving the airborne refrigeration component to rotate with the rotating rods, the rotating rods being provided with locking pins for locking the rotating positions.

[0011] The lifting platform of the application is connected to the support frame of the assembly vehicle through first and second support groups, the middle part of the first and second support groups being connected in a scissor support structure that is driven by an actuator to change the opening angle, the lower end of the first support group being movably connected to the long slide rail on the support frame, the upper end of the first support group being rotatably connected to the lifting platform, the lower end of the second support group being rotatably connected to the support frame, and the upper end of the second support group being movably connected to the long slide rail of the lifting platform.

[0012] The second object of the application is to provide a pipeline leakage testing method for an airborne refrigeration component, which uses the pipeline leakage testing device described above and comprises the following steps:

[0013] Before testing, all valves on the pipeline of the testing device are closed, the large leakage test of the airborne refrigeration component is started, the air source is turned on to the pipeline of the airborne refrigeration component, so that air can enter the airborne refrigeration component placed in the vacuum chamber through the first pressure regulator, the first air filter, the three-way valve, the first valve and the first pressure gauge, the air source is turned on, the first pressure regulator and the three-way valve are adjusted to charge compressed air into the airborne refrigeration component, and the pressure value displayed by the first pressure gauge is observed, when the displayed pressure value is the target test value and remains for 1 minute, the air source and the first valve are closed to stop charging compressed air, and then the following method is used for judgment:

[0014] If the displayed value P1 of the first pressure gauge at this time is A < the target test value, then there is leakage in the pipeline of the measured airborne refrigeration component;

[0015] If the displayed value P1 of the first pressure gauge at this time is A the target test value, the first vacuum pump and the valve between the first vacuum pump and the vacuum chamber are turned on to exhaust the air in the vacuum chamber, and when the pressure in the vacuum chamber is <1 psia, this state is maintained for 5 minutes, the displayed value P1 of the first pressure gauge at this time is recorded, B and whether the measured airborne component has leakage is determined according to the difference between P1 A and P1 B .

[0016] The large leakage test is a coarse test for leakage of the airborne refrigeration component, and is used for leakage detection of pipelines of various refrigeration components on the aircraft.

[0017] In some embodiments, when 25 psia ≥ target test value ≥ 20 psia, and P1A-P1B < 2 psia is measured, there is no leakage in the pipeline of the measured airborne refrigeration component.

[0018] As a feasible embodiment, when the vacuum chamber is evacuated, the first adjustable pressure relief valve is adjusted to control the degree of evacuation, so that the pressure display value of the first adjustable pressure relief valve is < 1 psia.

[0019] The third object of the present application is to provide a pipeline leakage test method for an airborne refrigeration component, which uses the pipeline leakage test device described above, and includes the following steps:

[0020] Before the test, all valves on the pipeline of the test device are closed, the helium leakage test of the airborne refrigeration component is started, the second vacuum pump is turned on, the air and residual refrigerant inside the airborne refrigeration component placed in the vacuum chamber are pumped out by adjusting the three-way valve and the first valve, the residual refrigerant flows into the liquid accumulator, the second vacuum pump is stopped, the first vacuum pump and the valve on the pipeline between the first vacuum pump and the vacuum chamber are turned on to pump out the air in the vacuum chamber, and the first vacuum pump is stopped when the pressure in the vacuum chamber is < 1 psia, the helium source is turned on, the second pressure regulator and the three-way valve are adjusted to fill helium into the interior of the airborne refrigeration component, the first pressure gauge is observed, the helium source and the first valve are closed when the display value of the first pressure gauge is the target test value, the helium leak detector is turned on, the required leakage rate is set, and this state is maintained, and it is observed whether the helium leak detector alarms within the required test time, and if the helium leak detector alarms, the pipeline of the measured airborne refrigeration component has a leakage.

[0021] Similarly, during the helium leakage test, when the vacuum chamber is evacuated, the first adjustable pressure relief valve is adjusted to control the degree of evacuation, so that the pressure display value of the first adjustable pressure relief valve is < 1 psia.

[0022] The present application has the following beneficial effects:

[0023] 1. By the connection mode of the vacuum chamber and the multiple pipelines, the pipeline leakage test device for the airborne refrigeration component of the present application can be adapted to different airborne refrigeration components, avoiding the research and development investment of multiple test devices, saving cost, and meeting the related test requirements of different airborne refrigeration components at the same time through one test device.

[0024] 2. The present application is provided with a vacuum chamber, and uses the vacuum pressure method to perform the large leakage test and the helium leakage test on the airborne refrigeration component, which can improve the test precision of pipeline leakage and ensure the pipeline integrity of the airborne refrigeration component, thereby providing strong protection for the flight safety and stable operation of the civil aircraft.

[0025] 3. The application is provided with a liquid reservoir and a second vacuum pump, which can recycle the residual refrigerant inside the airborne refrigeration component and protect the inside of the second vacuum pump from being polluted by the residual refrigerant, and the application can conveniently and quickly extract the residual refrigerant and internal gas of the airborne refrigeration component, so as to improve the accuracy of helium leakage test.

[0026] 4. The design of the assembly vehicle of the application can lower the lifting platform to a low position to reduce the center of gravity when transporting and moving, so as to ensure the stability of the assembly vehicle, and a matching assembly frame is designed according to the weight and center of gravity of the airborne refrigeration component to fix the airborne refrigeration component, so as to ensure that the assembly vehicle is stable and does not shake after loading the refrigeration component. The lifting platform can be adjusted to different heights, which is convenient for checking, disassembling and assembling the refrigeration component. The locking pin plays a role in fixing and locking the position of the assembly frame, so as to prevent the shaking influence of the assembly vehicle on the refrigeration component. The rotating rod and its driving components can operate the rotation of the assembly frame and drive the rotation of the airborne refrigeration component, so as to display different angles for disassembly and assembly work.

[0027] 5. The control cabinet provided in the application realizes data acquisition and processing, real-time monitoring of the test process and data, timely data support for technical personnel, and improved test convenience. BRIEF DESCRIPTION OF DRAWINGS

[0028] The above and / or additional aspects and advantages of the application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings.

[0029] Figure 1 A structure schematic diagram of a pipeline leakage test device of an airborne refrigeration equipment according to an embodiment of the application is shown;

[0030] Figure 2 A principle schematic diagram of a pipeline leakage test device of an airborne refrigeration equipment according to an embodiment of the application is shown;

[0031] Figure 3 A structure schematic diagram of an assembly vehicle of a pipeline leakage test device of an airborne refrigeration equipment according to an embodiment of the application is shown;

[0032] Figure 4 A PECS / ICS large leakage test flowchart of a pipeline leakage test method of an airborne refrigeration equipment according to an embodiment of the application is shown;

[0033] Figure 5 A PECS / ICS helium leakage test flowchart of a pipeline leakage test method of an airborne refrigeration equipment according to an embodiment of the application is shown;

[0034] Figure 6A schematic diagram of a SCU heat exchanger circuit leakage test process of a pipeline leakage test method of an airborne refrigeration device is shown.

[0035] wherein, Figures 1 to 6 The correspondence between the reference signs and the components is as follows:

[0036] 10 - control cabinet, 20 - gas circuit module, 30 - helium leak detector, 40 - vacuum cavity, 50 - tooling table, 60 - assembly vehicle, 101 - data acquisition module, 202 - first vacuum pump, 204 - second vacuum pump, 206 - liquid accumulator, 208 - first pressure gauge, 210 - first pressure regulator, 212 - second pressure regulator, 214 - first adjustable pressure relief valve, 216 - second adjustable pressure relief valve, 218 - second ball valve, 220 - fourth ball valve, 222 - sixth ball valve, 224 - first exhaust port, 226 - three-way valve, 228 - second gas filter, 230 - helium source, 232 - first valve, 234 - fifth ball valve, 236 - second exhaust port, 238 - air source, 240 - first gas filter, 602 - support frame, 604 - first support group, 606 - second support group, 608 - universal roller, 610 - fixed roller, 612 - foot brake block, 614 - hand grip, 616 - slide rail, 618 - lifting platform, 620 - support column, 622 - assembly frame, 624 - connecting rod, 626 - rotating rod, 628 - locking block, 630 - locking bolt, 632 - locking pin, 634 - damping crank, 636 - foot pedal rod, 638 - oil pump, 640 - actuator cylinder. DETAILED DESCRIPTION

[0037] The technical solutions of the present application will be described in detail below with reference to the drawings and examples, so that those skilled in the art can better understand and implement the technical solutions of the present application.

[0038] Example 1:

[0039] As Figures 1 to 3 shown, a pipeline leakage test device for airborne refrigeration components includes a helium leak detector 30 and a tooling table 50 for placing the helium leak detector 30, and further includes:

[0040] A vacuum cavity 40 that can be opened and closed is used to place the airborne refrigeration components to be tested, and the vacuum cavity 40 is connected to the helium leak detector 30 through a valve-equipped pipeline, as shown in Figure 2 , a second ball valve 218 is provided on the pipeline of the vacuum cavity 40 and the helium leak detector 30;

[0041] The air circuit module 20, which can be stored on the tool table 50, includes a first vacuum pump 202, a second vacuum pump 204, a liquid accumulator 206, and a pipeline system with pressure gauges, pressure regulators, adjustable pressure relief valves, and valves for connecting with the vacuum chamber 40 and the on-board refrigeration components, wherein the first vacuum pump 202 is connected with the vacuum chamber 40 through a pipeline with a fourth ball valve 220 for vacuumizing the vacuum chamber 40, the pipeline inlet or outlet of the on-board refrigeration components is connected with the liquid accumulator 206 through a pipeline with a first pressure gauge 208, a first valve 232, and a three-way valve 226, the liquid accumulator 206 is connected with the second vacuum pump 204 through a pipeline, and the air and residual refrigerant in the on-board refrigeration components are pumped out by the second vacuum pump 204, the pumped-out residual refrigerant is stored in the liquid accumulator 206 for recycling, the first pressure gauge 208 is used for detecting the internal pressure of the pipeline of the on-board refrigeration components, the three-way valve 226 has three valve ports that can be switched on and off, two valve ports are connected to the liquid accumulator 206 and the pipeline of the on-board refrigeration components, respectively, and the other valve port is connected with an air source branch, a helium source branch, and an on-board refrigeration component exhaust branch in parallel, the vacuum chamber 40 is connected with a first exhaust port 224 through a pipeline with a first adjustable pressure relief valve 214 and a sixth ball valve 222, the air source branch fills air into the on-board refrigeration components through a pipeline connected with an air source 238 and having a first pressure regulator 210 and a first air filter 240, and a pipeline between the three-way valve 226 and the on-board refrigeration components, the helium source branch fills helium into the on-board refrigeration components through a pipeline connected with a helium source 230 and having a second pressure regulator 212, a second adjustable pressure relief valve 216, and a second air filter 228, and a pipeline between the three-way valve 226 and the on-board refrigeration components, and the on-board refrigeration component exhaust branch is provided with a second exhaust port 236 and a fifth ball valve 234;

[0042] The control cabinet 10 includes an industrial computer, a data acquisition module 101, an adjustable DC power supply, and a monitor, the data acquisition module 101 acquires state data of the pressure regulators, adjustable pressure relief valves, and valves, acquires pressure information of the pressure gauges, acquires leakage data detected by the helium leak detector 30, and feeds back to the industrial computer, the industrial computer is connected with the adjustable DC power supply, the first vacuum pump 202, the second vacuum pump 204, each valve, and the monitor, and is used for monitoring, controlling, and displaying the test process.

[0043] In an embodiment, the pressure information of the sensors, valves and vacuum pumps is collected by the data collection module 101, the leakage information of the helium leak detector is collected, the collected pressure information and leakage information are transmitted to the industrial computer for processing, and the processed data is displayed on the monitor through the virtual instrument system of the control cabinet. Through the sensor, virtual instrument and field bus technology, and highly integrated separate manual valves and measuring instruments, data collection and processing are realized. The technician can intuitively observe the pressure state of each node and the leakage of the refrigeration component, and timely adjust or terminate the test parameters.

[0044] The air source 238 provides compressed air, and the required air pressure value is adjusted by the first pressure regulator 210 to protect the elements in the pipeline and the airborne refrigeration component from excessive pressure. The filtered air through the first air filter 240 is filled into the airborne refrigeration component inside the vacuum cavity 40, and the first pressure gauge 208 can be used to observe whether the airborne refrigeration component pipeline has leakage during rough leakage detection. To improve detection accuracy, the vacuum cavity 40 is evacuated, and the pressure difference change in the airborne refrigeration component pipeline before and after evacuation is observed by the first pressure gauge 208. The vacuum pressure method is used to detect the leakage of the airborne refrigeration component.

[0045] The helium source 230 provides high-purity helium, and the required helium pressure value is adjusted by the second pressure regulator 212. The second adjustable pressure relief valve 216 is used to limit the output pressure, which can protect the elements in the pipeline and the refrigeration component from excessive pressure. The filtered high-purity helium through the second air filter 228 is filled into the airborne refrigeration component inside the vacuum cavity 40. If the airborne refrigeration component pipeline has leakage, helium will enter the vacuum cavity 40 inside the vacuum state through the leakage point, so that the helium leak rate can be detected by the helium leak detector 30, the fine leakage of the airborne refrigeration component pipeline can be detected, and high-precision leakage detection can be realized to avoid the situation that fine leakage is not detected, and to ensure the normal operation of the airborne refrigeration component and its system.

[0046] In an embodiment: Figure 3As shown, the assembly vehicle 60 for transporting the airborne refrigeration components is provided, the assembly vehicle 60 comprises a movable lifting platform 618, support columns 620 are erected on both sides of the lifting platform 618, an assembly frame 622 is installed between the support columns 620 on both sides, both ends of the assembly frame 622 are rotatably connected with the support columns 620 through connecting rods 624 and rotating rods 626, the assembly frame 622 is fixedly connected with the airborne refrigeration components through a connecting assembly, the rotating rod 626 is connected with a driving component for driving the airborne refrigeration components to rotate with the rotating rod 626, and the rotating rod 626 is provided with a locking pin 632 for locking the rotating position. In the embodiment, the connecting assembly is composed of a locking block 628 and a locking bolt 630, the airborne refrigeration components can be firmly connected on the assembly frame 622, the driving component can adopt a worm reducer, and a damping crank 634 is operated to control the rotation of the rotating rod 626.

[0047] As a feasible embodiment, the lifting platform 618 is connected with the support frame 602 of the assembly vehicle 60 through the first support group 604 and the second support group 606, the middle part of the first support group 604 and the second support group 606 is rotatably connected and is constructed as a scissor support which changes the opening angle by being driven by an actuator cylinder 640, the lower end of the first support group 604 is movably connected with the long slide rail 616 on the support frame 602, the upper end of the first support group 604 is rotatably connected with the lifting platform 618, the lower end of the second support group 606 is rotatably connected with the support frame 602, and the upper end of the second support group 606 is movably connected with the long slide rail of the lifting platform 618, the actuator cylinder 640 is driven by an oil hydraulic pump 638, and the lifting platform 618 is controlled to ascend and descend by the extension and retraction of the rod of the actuator cylinder 640. It should be noted that the airborne refrigeration components weigh hundreds of kilograms and are of great value, and the positions of the assembly frame 622 and the support columns 620 relative to the lifting platform 618 are set according to the center of gravity of the airborne refrigeration components, so as to ensure the stable transportation of the airborne refrigeration components. In the embodiment, the support frame 602 is provided with universal wheels 608, fixed wheels 610, foot brake blocks 612 and handgrips 614 to facilitate the movement and control of the assembly vehicle.

[0048] The design of the assembly vehicle 60 can lower the lifting platform to a low position when transporting and moving to reduce the center of gravity and ensure the stability of the assembly vehicle 60. The matching assembly frame 622 is designed according to the weight and center of gravity of the airborne refrigeration components to fix the airborne refrigeration components, so as to ensure that the assembly vehicle 60 does not shake after loading the refrigeration components. The lifting platform 618 can be adjusted to different heights to facilitate the inspection, disassembly and assembly operations of the airborne refrigeration components. The locking pin 632 plays a role in fixing and locking the position of the assembly frame 622, preventing the shaking of the refrigeration components caused by the movement of the assembly vehicle 60. The rotating rod 626 and its driving component can operate the assembly frame 622 to rotate and drive the airborne refrigeration components to rotate, so as to display different angles for disassembly and assembly work.

[0049] Embodiment 2

[0050] This embodiment provides a method for testing the leakage of the pipeline of an airborne refrigeration component, which uses the pipeline leakage testing device of Embodiment 1 to perform a large leakage test on the airborne refrigeration component PECS / ICS. This embodiment takes the Boeing 787 aircraft as an example, where PECS refers to the electronic power cooling system, and ICS refers to the integrated cooling system.

[0051] The test procedure is shown in Figure 4 Before testing, all valves on the pipeline of the test device are closed. Start the large leakage test of the airborne refrigeration component. Turn on the air source 238 to the pipeline of the airborne refrigeration component, so that air can enter the airborne refrigeration component placed in the vacuum chamber 40 through the first pressure regulator 210, the first air filter 240, the three-way valve 226, the first valve 232, and the first pressure gauge 208. Turn on the air source 238, adjust the first pressure regulator 210 and the three-way valve 226 to fill compressed air into the airborne refrigeration component, and observe the pressure value displayed by the first pressure gauge 208. When the displayed pressure value is the target test value of 20-25 psia and remains for 1 minute, turn off the air source 238 and the first valve 232 to stop filling compressed air. Then judge according to the following method:

[0052] If the value P1 A of the first pressure gauge at this time is not equal to the target test value, there is leakage in the pipeline of the tested airborne refrigeration component.

[0053] If the value P1 A of the first pressure gauge at this time is equal to the target test value, turn on the first vacuum pump 202 and the fourth ball valve 220 between the first vacuum pump 202 and the vacuum chamber 40 to exhaust the air in the vacuum chamber 40. When the pressure in the vacuum chamber 40 is <1 psia, keep this state for 5 minutes. Record the value P1 B of the first pressure gauge at this time. According to the difference between P1 A and P1 B , judge whether there is leakage in the tested airborne component. If P1A-P1B<2 psia, there is no leakage in the pipeline of the tested airborne refrigeration component. When the vacuum chamber 40 is being evacuated, adjust the first adjustable pressure relief valve 214 to control the evacuation degree, so that the pressure display value of the first adjustable pressure relief valve 214 is <1 psia.

[0054] After the test is completed, exhaust the vacuum chamber through the first exhaust port 224 and exhaust the airborne refrigeration component through the second exhaust port 236 to restore them to their natural state.

[0055] Embodiment 3

[0056] The embodiment provides a pipeline leakage test method of an airborne refrigeration component, adopts the pipeline leakage test device of the embodiment 1 to perform helium leakage test on the measured airborne refrigeration component PECS / ICS, and takes the Boeing 787 aircraft as an example, wherein PECS refers to an electronic power cooling system, and ICS refers to an integrated cooling system.

[0057] The test flow is shown in the figure. Figure 5 Before the test, all the valves on the pipeline of the test device are closed, the helium leakage test of the airborne refrigeration component is started, the second vacuum pump 204 is opened, the air and residual refrigerant in the interior of the airborne refrigeration component placed in the vacuum cavity 40 are extracted by adjusting the three-way valve 226 and the first valve 232, the residual refrigerant flows into the liquid accumulator 206, the second vacuum pump 204 is stopped, the first vacuum pump 202 and the fourth ball valve 220 on the pipeline between the first vacuum pump 202 and the vacuum cavity 40 are opened, the air in the vacuum cavity 40 is extracted, and after the pressure in the vacuum cavity 40 is less than 1 psia, the first vacuum pump 202 is stopped, the helium source 230 is opened, the second pressure regulator 212 and the three-way valve 226 are adjusted to fill the helium into the interior of the airborne refrigeration component, the first pressure gauge 208 is observed, and when the display value of the first pressure gauge 208 is the target test value 76 ± 1 psia, the helium source and the first valve 232 are closed, at this time, the display value P10 of the first pressure gauge 208 is 76 ± 1 psia. The helium leak detector 30 is opened, the leakage rate required by the test item is set, this state is kept, whether the helium leak detector alarms in the required test time is observed, if the helium leak detector 30 alarms, the pipeline of the measured airborne refrigeration component leaks. In the embodiment, the leakage rate is set to be not greater than 3.23 x 10 -4 atm-cc / sec, this state is kept, the leakage test data in 5 minutes, 10 minutes and 15 minutes from the start of the test are observed respectively, if the leakage rate of the test is greater than 3.23 x 10 -4 atm-cc / sec, the helium leak detector 30 alarms, which indicates that the measured airborne refrigeration component leaks, if the alarm is not given, there is no leakage.

[0058] During the leakage test, when the vacuum cavity is pumped, the first adjustable pressure relief valve 214 is also adjusted to control the vacuum degree, so that the pressure display value PV0 of the first adjustable pressure relief valve 214 is less than 1 psia.

[0059] After the test is completed, the vacuum cavity is exhausted through the first exhaust port 224, and the airborne refrigeration component is exhausted through the second exhaust port 236, so that they return to the natural state.

[0060] Embodiment 4:

[0061] The embodiment provides a pipeline leakage test method of an airborne refrigeration component.

[0062] The test procedure is shown in the figure. Figure 6 Before the test, all the valves on the pipeline of the test device are closed, the helium leakage test of the airborne refrigeration component is started, the second vacuum pump 204 is opened, the air and residual refrigerant in the interior of the airborne refrigeration component placed in the vacuum cavity 40 are extracted by adjusting the three-way valve 226 and the first valve 232, the residual refrigerant flows into the liquid accumulator 206, the second vacuum pump 204 is stopped, the first vacuum pump 202 and the fourth ball valve 220 between the first vacuum pump 202 and the vacuum cavity 40 are opened, the air in the vacuum cavity 40 is extracted, and the first vacuum pump 202 is stopped when the pressure in the vacuum cavity 40 is less than 1 psia, the helium source 230 is opened, the second pressure regulator 212 and the three-way valve 226 are adjusted to fill the helium into the interior of the airborne refrigeration component, the first pressure gauge 208 is observed, the helium source and the first valve 232 are closed when the value displayed by the first pressure gauge 208 is the target test value 200±10 psig, and the value P1 displayed by the first pressure gauge 208 is 200±10 psig at this time. HX The helium leak detector 30 is opened, the leakage rate required by the test item is set, the state is kept, whether the helium leak detector alarms in the required test time is observed, and if the helium leak detector 30 alarms, the pipeline of the measured airborne refrigeration component leaks. In the embodiment, the leakage rate is not greater than 2.4*10 -4 atm-cc / sec, the state is kept, and if the leakage rate of the test is greater than 2.4*10 -4 atm-cc / sec, the helium leak detector 30 alarms, indicating that the measured airborne refrigeration component leaks, and if the alarm is not given, there is no leakage.

[0063] During the leakage test, when the vacuum cavity is pumped, the first adjustable pressure relief valve 214 is also adjusted to control the vacuum degree, and the pressure display value PV HX of the first adjustable pressure relief valve 214 is less than 1 psia.

[0064] After the test is completed, the vacuum cavity is exhausted through the first exhaust port 224, and the airborne refrigeration component is exhausted through the second exhaust port 236, so that they return to the natural state.

[0065] According to the embodiment of the application, the pipeline monitoring parameter information is obtained, and the pressure mutation data, the pipeline over-temperature data and the vacuum degree abnormal data are extracted.

[0066] The pipeline monitoring parameter information is obtained, and the pressure mutation data, the pipeline over-temperature data and the vacuum degree abnormal data are extracted.

[0067] According to the pressure mutation data, pipeline over-temperature data and vacuum degree abnormal data, a preset pipeline evaluation model is used for processing to obtain a structure vulnerability index;

[0068] An average structure vulnerability index of the same type of pipeline is obtained from a preset pipeline monitoring database, and the structure vulnerability index is corrected by a preset vulnerability correction model to obtain a corrected structure vulnerability index;

[0069] The corrected structure vulnerability index is compared with a preset correction index threshold to obtain a correction index deviation rate;

[0070] It is judged whether the correction index deviation rate is greater than a preset correction index deviation rate threshold;

[0071] If the correction index deviation rate is greater than or equal to the correction index deviation rate threshold, the corrected structure vulnerability index does not meet the requirements;

[0072] If the correction index deviation rate is less than the correction index deviation rate threshold, the corrected structure vulnerability index meets the requirements;

[0073] The calculation formula of the pipeline evaluation model is:

[0074]

[0075] Wherein, G ψ is the structure vulnerability index, p b , w s , z y are the pressure mutation data, pipeline over-temperature data and vacuum degree abnormal data respectively, ln is the natural logarithm, and α, β, γ, δ are preset characteristic coefficients (the characteristic coefficients are obtained by querying a preset pipeline monitoring database);

[0076] The calculation formula of the vulnerability correction model is:

[0077]

[0078] Wherein, C φ is the corrected structure vulnerability index, G ψ is the structure vulnerability index, G a is the average structure vulnerability index, ln is the natural logarithm, and σ, ρ, π are preset characteristic coefficients (the characteristic coefficients are obtained by querying a preset pipeline monitoring database).

[0079] It should be noted that, in order to improve the reliability of the pipeline structure and reduce the existence of hidden failures, first, the pipeline monitoring parameter information is acquired, the pressure mutation data, the pipeline over-temperature data and the vacuum degree abnormal data are extracted, the structure vulnerability index is obtained by processing through the preset pipeline evaluation model, the pressure mutation data refers to that the pressure data in the pipeline has suddenly changed, which exceeds the normal or expected pressure fluctuation range in a very short time, and it is necessary to further check whether it is a signal problem or a pipeline structure problem, the pipeline over-temperature data refers to that the pipeline temperature exceeds the normal test pipeline temperature range, and there can be many reasons for the over-temperature, such as excessive power consumption of equipment, pipeline system blockage, etc., which can cause high temperature, and the monitoring of pipeline temperature can avoid damage to equipment and personal safety hazards, the vacuum degree abnormal data refers to that the gas thinness in the pipeline deviates from the normal or expected range, which can be caused by poor system sealing, vacuum pump performance decline, vacuum pipeline gas leakage, etc., and further investigation is required. The pressure mutation data, the pipeline over-temperature data and the vacuum degree abnormal data can be obtained through the corresponding data collector integrated with the sensor. The structure vulnerability average index of the same type of pipeline is obtained through the preset pipeline monitoring database, and the structure vulnerability index is corrected by the preset vulnerability correction model, to obtain the structure vulnerability correction index, which reflects whether the overall structure of the pipeline and each fitting are normal and reliable. The structure vulnerability correction index is compared with the preset correction index threshold to obtain the correction index deviation rate, and it is judged whether the correction index deviation rate is greater than the preset correction index deviation rate threshold, if the correction index deviation rate is greater than or equal to the correction index deviation rate threshold, the structure vulnerability correction index does not meet the requirements, for example, the correction index deviation rate is 2%, the correction index deviation rate threshold is 2%, if the correction index deviation rate is less than the correction index deviation rate threshold, the structure vulnerability correction index meets the requirements, for example, the correction index deviation rate is 1%, the correction index deviation rate threshold is 2%.

[0080] The application can also be used for testing similar airborne refrigeration components of other aircraft and for testing airborne refrigeration components such as air coolers, refrigerators, etc., and the corresponding pipeline interface fittings and test parameters can be adjusted according to test requirements.

[0081] The above embodiments are only preferred embodiments of the application, but cannot be regarded as a limitation of the application, any modification and improvement based on the concept of the application shall fall within the protection scope of the application, and the specific protection scope shall be subject to the claims.

Claims

1. A pipe leakage testing device for an airborne refrigeration component, comprising a helium leak detector and a fixture for placing the helium leak detector, characterized in that, Also includes: An openable and closable vacuum chamber is used to place the airborne refrigeration component to be tested, and the vacuum chamber is connected to the helium leak detector through a pipeline with a valve. The gas path module includes a first vacuum pump, a second vacuum pump, a liquid reservoir, and a piping system with a pressure gauge, a pressure regulator, an adjustable pressure relief valve, and a valve for connection to the vacuum chamber and the onboard refrigeration component. The first vacuum pump is connected to the vacuum chamber via a valved pipe to evacuate the vacuum chamber. The inlet or outlet of the onboard refrigeration component's piping is connected to the liquid reservoir via a pipe equipped with a first pressure gauge, a first valve, and a three-way valve. The liquid reservoir is connected to the second vacuum pump via a pipe. The second vacuum pump extracts air and residual refrigerant from the onboard refrigeration component, and the extracted residual refrigerant is stored in the liquid reservoir. The first pressure gauge is used to detect the pressure of the onboard refrigeration component. The internal pressure of the pipeline; another valve port of the three-way valve is connected to a parallel air source branch, a helium source branch, and an exhaust branch of the airborne refrigeration component; the vacuum chamber is connected to a first exhaust port through a pipeline with a first adjustable pressure relief valve and a valve; the air source branch fills the airborne refrigeration component with air through a pipeline connected to the air source and equipped with a first pressure regulator and a first air filter, as well as a pipeline between the three-way valve and the airborne refrigeration component; the helium source branch fills the airborne refrigeration component with helium through a pipeline connected to the helium source and equipped with a second pressure regulator, a second adjustable pressure relief valve, and a second air filter, as well as a pipeline between the three-way valve and the airborne refrigeration component; a second exhaust port is provided on the exhaust branch of the airborne refrigeration component. The control cabinet includes an industrial computer, a data acquisition module, an adjustable DC power supply, and a monitor. The data acquisition module collects status data from the pressure regulator, adjustable pressure relief valve, and valves, collects pressure information from the pressure gauge, and collects leakage data detected by the helium leak detector and feeds it back to the industrial computer. The industrial computer is connected to the adjustable DC power supply, the first vacuum pump, the second vacuum pump, each valve, and the monitor for monitoring, controlling, and displaying the testing process.

2. The pipeline leakage testing device for airborne refrigeration components according to claim 1, characterized in that: It also includes an assembly vehicle for transporting airborne refrigeration components. The assembly vehicle includes a movable lifting platform with support columns erected on both sides of the lifting platform. An assembly frame is installed between the support columns on both sides. The two ends of the assembly frame are rotatably connected to the support columns through connecting rods and rotating rods. The assembly frame is fixedly connected to the airborne refrigeration components through connecting components. The rotating rod is connected to a driving component for driving the airborne refrigeration components to rotate with the rotating rod. The rotating rod is provided with a locking pin for locking the rotation position.

3. The pipeline leakage testing device for airborne refrigeration components according to claim 2, characterized in that: The lifting platform is connected to the support frame of the assembly vehicle via a first bracket group and a second bracket group. The middle part of the first bracket group and the second bracket group is rotatably connected and configured as a scissor brace driven by an actuator to change the opening angle. The lower end of the first bracket group is movably connected to a long slide rail on the support frame, the upper end of the first bracket group is rotatably connected to the lifting platform, the lower end of the second bracket group is rotatably connected to the support frame, and the upper end of the second bracket group is movably connected to the long slide rail of the lifting platform.

4. A method for testing pipeline leakage in an airborne refrigeration component, characterized in that: The pipeline leakage testing device according to any one of claims 1 to 3 includes the following steps: Before testing, all valves on the testing device pipeline are closed. The large leakage test of the airborne refrigeration component begins. The air source is connected to the airborne refrigeration component pipeline, allowing air to enter the airborne refrigeration component, which is already placed in the vacuum chamber, through the first pressure regulator, first air filter, three-way valve, first valve, and first pressure gauge. The air source is turned on, and compressed air is introduced into the airborne refrigeration component by adjusting the first pressure regulator and three-way valve. The pressure value displayed on the first pressure gauge is observed. When the displayed pressure value is the target test value and remains there for 1 minute, the air source and first valve are turned off to stop the introduction of compressed air. Then, the following method is used to determine the leakage: If at this time the first pressure gauge shows the value P1 A If the target test value is reached, a leak is present in the pipeline of the measured airborne refrigeration component If the first pressure gauge displays value P1 at this time A To achieve the target test value, open the valves on the first vacuum pump and the pipeline connecting the first vacuum pump to the vacuum chamber to evacuate the air from the vacuum chamber until the pressure inside the vacuum chamber is <1 psia. Maintain this state for 5 minutes and record the value P1 displayed on the first pressure gauge at this time. B According to P1 A -P1 B The difference obtained is used to determine whether there is leakage in the tested airborne component.

5. The method for testing pipeline leakage of airborne refrigeration components according to claim 4, characterized in that: If the target test value is ≥20psia and the measured P1A-P1B <2psia, then there is no leakage in the piping of the tested airborne refrigeration component.

6. The method for testing pipeline leakage of airborne refrigeration components according to claim 4, characterized in that: When the vacuum chamber is evacuated, the first adjustable pressure relief valve is adjusted to control the degree of vacuum, so that the pressure display value of the first adjustable pressure relief valve is <1 psia.

7. A method for testing pipeline leakage in an airborne refrigeration component, characterized in that: The pipeline leakage testing device according to any one of claims 1 to 3 includes the following steps: Before testing, all valves on the testing equipment pipeline are closed. To begin the helium leak test on the airborne refrigeration component, the second vacuum pump is turned on. By adjusting the three-way valve and the first valve, air and residual refrigerant inside the airborne refrigeration component placed in the vacuum chamber are extracted. The residual refrigerant flows into the receiver. The second vacuum pump is stopped. The first vacuum pump and the valve on the pipeline between the first vacuum pump and the vacuum chamber are opened to extract air from the vacuum chamber. The first vacuum pump is stopped when the pressure inside the vacuum chamber is <1 psia. The helium source is turned on, and helium is introduced into the airborne refrigeration component by adjusting the second pressure regulator and the three-way valve. The first pressure gauge is observed. When the first pressure gauge displays the target test value, the helium source and the first valve are closed. The helium leak detector is turned on, and the required leakage rate for the test item is set. This state is maintained, and the helium leak detector is observed to see if it alarms within the required test time. If the helium leak detector alarms, a leak has occurred in the pipeline of the tested airborne refrigeration component.

8. The method for testing pipeline leakage of airborne refrigeration components according to claim 7, characterized in that: When the vacuum chamber is evacuated, the first adjustable pressure relief valve is adjusted to control the degree of vacuum, so that the pressure display value of the first adjustable pressure relief valve is <1 psia.

Images