Cleaning device and cleaning method for heat exchanger in aircraft environment control system

Abstract

The invention relates to a cleaning device and method for a heat exchanger in an aircraft environment control system, and relates to the technical field of heat exchanger cleaning devices. The cleaning device comprises a cabinet, a liquid collecting box, a main pipe, a clear water pipe, a first electric valve, a second electric valve, a first branch pipe, a second branch pipe, a liquid pump, a third electric valve, a fourth electric valve, a first liquid storage box, a second liquid storage box, a third branch pipe, a fourth branch pipe, a first high-speed liquid drainage blow-down pipe, a second high-speed liquid drainage blow-down pipe and a fifth electric valve. The cleaning device comprises a first electric valve, a second electric valve, a third electric valve, a fourth electric valve, a fifth electric valve, a sixth electric valve, a seventh electric valve, an eighth electric valve, an air compressor, an air storage tank and the like. The invention further discloses a method for cleaning the heat exchanger in the aircraft environment control system through the cleaning device. According to the cleaning device and method, dirt inside and outside the heat exchanger is effectively removed through multiple times of high-speed pulse cleaning, the cleaning efficiency and cleanliness are improved, and the performance and the service life of the heat exchanger are ensured.

Description

Technical Field

[0001] The present application relates to the technical field of heat exchanger cleaning devices, and in particular to a cleaning device and a cleaning method for a heat exchanger in an aircraft environmental control system. Background Art

[0002] The heat exchanger in the aircraft environmental control system is one of the indispensable key components in the modern aviation industry, and its performance directly affects the safety and comfort of flight. With the rapid development of the aviation industry, the cleanliness and maintenance requirements of heat exchangers are getting higher and higher. Traditional cleaning methods can no longer meet the needs of efficient and thorough cleaning, especially in the cleaning of heat exchangers in large aircraft. Traditional methods are often time-consuming, inefficient, and easy to damage the internal structure of the heat exchanger.

[0003] At present, the common heat exchanger cleaning methods on the market mainly include manual cleaning, high-pressure water gun cleaning, ultrasonic cleaning, etc. Although manual cleaning is simple and easy, it is labor-intensive, the cleaning effect is unstable, and it is difficult to meet high standards of cleaning requirements. Although high-pressure water gun cleaning can improve cleaning efficiency, it is easy to damage the internal structure of the heat exchanger during the cleaning process, especially the impact on precision parts is greater. Although ultrasonic cleaning can effectively remove dirt, it may damage the surface protective layer of the heat exchanger, and the cleaning cycle is long, which is not suitable for large-scale use.

[0004] These existing cleaning methods generally have problems such as low cleaning efficiency, complicated operation, and significant damage to the internal structure of the heat exchanger. These problems are particularly prominent in aircraft heat exchangers that need to be cleaned frequently, resulting in the cleaning quality and efficiency failing to meet actual needs. Therefore, it is particularly important to develop an efficient, reliable, and non-destructive cleaning device for heat exchangers. Summary of the invention

[0005] In order to improve the efficiency and reliability of cleaning of a heat exchanger in an aircraft environmental control system while reducing damage to the heat exchanger, the present application provides a cleaning device and a cleaning method for a heat exchanger in an aircraft environmental control system.

[0006] In a first aspect, the present application provides a cleaning device for a heat exchanger in an aircraft environmental control system using the following technical solution: A cleaning device for a heat exchanger in an aircraft environment control system comprises a cabinet, a liquid collecting box is arranged in the cabinet, a main pipe is connected to the liquid collecting box, and a clean water pipe is connected to one side of the main pipe; A first electric valve is provided on the main pipe between the clean water pipe and the liquid collecting tank, and a second electric valve is provided on the clean water pipe; The main pipe is connected with a first branch pipe and a second branch pipe, and a liquid pump is arranged on the main pipe between the clean water pipe and the first branch pipe and the second branch pipe; the first branch pipe is provided with a third electric valve, and the second branch pipe is provided with a fourth electric valve; The first branch pipe is connected to a first liquid storage tank; the second branch pipe is connected to a second liquid storage tank; the first liquid storage tank is connected to a third branch pipe for communicating with one end of a heat exchanger, the third branch pipe is connected to a first high-speed liquid discharge and vent pipe, and a fifth electric valve is provided on the first high-speed liquid discharge and vent pipe; the second liquid storage tank is connected to a fourth branch pipe for communicating with the other end of the heat exchanger, the fourth branch pipe is connected to a second high-speed liquid discharge and vent pipe, and a sixth electric valve is provided on the second high-speed liquid discharge and vent pipe; the third branch pipe is provided with a seventh electric valve between the first liquid storage tank and the first high-speed liquid discharge and vent pipe, and the fourth branch pipe is provided with an eighth electric valve between the second liquid storage tank and the second high-speed liquid discharge and vent pipe; The cabinet is also provided with an air compressor and an air tank, wherein the air compressor is used to inflate the air tank; the air tank is connected with the first liquid storage tank and the second liquid storage tank, and a first solenoid valve is provided on the pipeline connecting the air tank with the first liquid storage tank and the second liquid storage tank.

[0007] In traditional power cleaning, the water is in a laminar flow state and moves parallel to the pipe. The closer to the pipe wall, the lower the water flow rate, and the lower the flushing effect. In this application, two sets of pipes are set to achieve intermittent pulse flushing, and high-pressure gas is combined to make the cleaning liquid turbulent. The water flow moves randomly and there is no flow rate attenuation phenomenon. The cleaning agent is then used to decompose and loosen the target substance, and the turbulent high-speed water flow is combined to achieve a good cleaning effect. It has the dual effects of chemical cleaning and physical cleaning, so the flushing effect will be better than traditional power cleaning.

[0008] Optionally, a fifth branch pipe is connected to the main pipe, and an atomizing nozzle array for spraying liquid toward the heat exchanger shell is arranged at the outlet end of the fifth branch pipe; and a second solenoid valve is arranged on the fifth branch pipe.

[0009] By adopting the above technical solution, adding the fifth branch pipe and the atomizing nozzle array, the shell of the heat exchanger can be rinsed at high speed while cleaning the heat exchanger core, further improving the comprehensiveness and thoroughness of the cleaning. The use of the atomizing nozzle array ensures the uniform spraying of the liquid and enhances the effect of removing dirt on the surface of the shell. In addition, through the control of the second solenoid valve, the precise control of the atomizing nozzle array is achieved, which improves the automation and flexibility of the cleaning process.

[0010] Optionally, the first branch pipe is connected to two first liquid storage tanks through branch pipes, each of which is connected to the heat exchanger through a third branch pipe; the second branch pipe is connected to two second liquid storage tanks through branch pipes, each of which is connected to the heat exchanger through a fourth branch pipe; the two third branch pipes and the two fourth branch pipes are respectively connected to the four sides of the heat exchanger and the third branch pipes and the fourth branch pipes are arranged opposite to each other.

[0011] By adopting the above technical solution, the first branch pipe is connected to the two first liquid storage tanks through the branch pipes, and the second branch pipe is connected to the two second liquid storage tanks through the branch pipes. Correspondingly, the two third branch pipes and the two fourth branch pipes are respectively connected to the four sides of the heat exchanger and the third branch pipes are arranged opposite to the fourth branch pipes, thereby achieving simultaneous cleaning in multiple directions, ensuring the smooth flow of the cleaning liquid, and improving the uniformity and comprehensiveness of the cleaning, ensuring that all parts of the heat exchanger can be effectively cleaned, and enhancing the cleaning effect.

[0012] Optionally, a liquid filter is provided in the liquid collecting box, and the inlet end of the main pipe is connected to the liquid filter; a sewage pipe is also connected to the bottom of one side of the liquid collecting box, and a sewage valve is provided on the sewage pipe.

[0013] By adopting the above technical solution, the cleaning liquid in the liquid collecting tank can be reused. The liquid filter is set in the liquid collecting tank, which can effectively filter out the impurities and dirt generated during the cleaning process, ensure the cleanliness of the cleaning liquid, prevent secondary pollution, and avoid pipe blockage. The setting of the sewage pipe is convenient for regularly discharging the dirt in the liquid collecting tank to keep the system clean and hygienic; the cleaning liquid can also be recycled through the sewage pipe, which is more environmentally friendly. This design not only improves the cleaning effect, but also extends the service life of the equipment and reduces maintenance costs.

[0014] Optionally, an air filter is provided at the air inlet end of the air compressor; and a safety valve is provided on the air storage tank.

[0015] By adopting the above technical solution, the air filter can ensure the quality of air entering the gas tank and prevent impurities from entering and affecting the normal operation and cleaning effect of the system; a safety valve is provided on the gas tank, which can automatically release pressure when the system pressure exceeds a preset value, thereby ensuring the safe operation of the equipment and preventing equipment damage or safety accidents caused by excessive pressure.

[0016] Optionally, the cabinet is divided into two layers, the liquid collecting box, liquid pump, air compressor and gas storage tank are arranged in the lower space of the cabinet, and the first liquid storage tank, the second liquid storage tank and various branch pipes are arranged in the upper space of the cabinet; The cabinet has a control panel on the front side, a display screen and a plurality of control buttons on the control panel, and inspection openings are provided on the left and right sides and / or the rear side of the cabinet, and an openable inspection cover is provided at the inspection opening.

[0017] By adopting the above technical solution, not only the space layout is optimized, the compactness and neatness of the equipment are improved, but also maintenance and inspection are facilitated.

[0018] Optionally, the liquid storage tank is a cylindrical pressure-bearing structure, used to support the cabinet; The cabinet, the main pipe, the first branch pipe, the second branch pipe, the third branch pipe and the fourth branch pipe are all made of stainless steel; the cabinet is also provided with a flexible interface for connecting the third branch pipe and the fourth branch pipe with the heat exchanger; The cleaning device also includes a controller.

[0019] By adopting the above technical solution, the liquid storage tank has a cylindrical pressure-bearing structure, which enhances the pressure-bearing capacity and structural stability of the liquid storage tank and cabinet, and improves the safety of the cleaning process. The cabinet and its internal pipes are made of stainless steel, ensuring the corrosion resistance and service life of the equipment. The design of the flexible interface makes the connection between the cleaning device and the heat exchanger more convenient and flexible, and adapts to different installation environments. The addition of the controller realizes the automatic control of the entire cleaning process, improving the cleaning efficiency and convenience of operation.

[0020] In a second aspect, the present application provides a method for cleaning a heat exchanger in an aircraft environmental control system using the following technical solution: A method for cleaning a heat exchanger in an aircraft environmental control system, using the above-mentioned cleaning device to clean the heat exchanger in the aircraft environmental control system, the cleaning method comprises the following steps: S1: The cleaning liquid containing the cleaning agent is placed in the liquid collecting tank; the clean water pipe is connected to the external clean water tank or the tap water pipe; S2: Start the power switch, the control system opens the first electric valve on the main pipe, opens the third electric valve on the first branch pipe, opens the seventh electric valve on the third branch pipe; simultaneously closes the second electric valve on the clean water pipe, closes the fourth electric valve on the second branch pipe, closes the fifth electric valve on the first high-speed liquid discharge pipe, closes the sixth electric valve on the second high-speed liquid discharge pipe, and closes the eighth electric valve on the fourth branch pipe; S3: The control system turns on the liquid pump to start working. The neutral cleaning liquid that meets the CMM requirements in the liquid collecting tank is supplied to the corresponding side channels of the heat exchanger and the first liquid storage tank under the action of the liquid pump; S4: When the first liquid storage tank is filled with cleaning liquid, the control system closes the third electric valve on the first branch pipe, and synchronously opens the first solenoid valve arranged on the pipeline between the gas storage tank and the first liquid storage tank, and then the control system instantaneously opens the sixth electric valve on the second high-speed liquid discharge pipe, and the cleaning liquid flows through the heat exchanger core at a high speed under the action of gas pressure, completing the first high-speed pulse cleaning, and the sprayed cleaning liquid flows back to the liquid collection tank through the collection hose; S5: Afterwards, the control system closes the first solenoid valve provided on the pipeline between the gas storage tank and the first liquid storage tank, closes the sixth electric valve on the second high-speed liquid discharge vent pipe, and closes the seventh electric valve on the third branch pipe; simultaneously opens the fourth electric valve on the second branch pipe, and opens the eighth electric valve on the fourth branch pipe; and fills the heat exchanger core and the second liquid storage tank with liquid through the liquid pump; S6: When the second liquid storage tank is filled with cleaning liquid, the control system opens the first solenoid valve provided on the pipeline between the gas storage tank and the second liquid storage tank, and then the control system instantly opens the fifth electric valve on the first high-speed liquid discharge vent pipe, and the cleaning liquid flushes the heat exchanger core at a high speed under the action of gas pressure, completing a flushing cycle; S7: After the above steps S2 to S6, 8 to 12 flushing cycles are performed, and then the control system closes the first electric valve on the main pipe, and simultaneously opens the second electric valve on the clean water pipe, switching to external clean water for flushing; finally, the heat exchanger core is flushed clean.

[0021] By adopting the above-mentioned technical scheme, the present application utilizes the turbulent flow field generated by the mixture of special high-pressure gas or cleaning liquid to form strong impact, friction and dispersion effects, so as to achieve the purpose of quickly washing and removing dirt or oil stains on the surface of the heat exchanger core. At the same time, compared with the ultrasonic cleaning method, the degree of damage to the heat exchanger core is reduced.

[0022] Optionally, in the above steps S4 and S6, the pressure in the liquid storage tank cavity needs to reach 0.25MPa±0.05MPa, and the pressure in the liquid storage tank is detected and controlled by a system pressure sensor.

[0023] By adopting the above technical solution, it can be effectively ensured that the cleaning liquid flows through the heat exchanger core at a high speed under the action of gas pressure, thereby achieving an efficient cleaning effect.

[0024] Optionally, in steps S4 and S5, the time between completing the first high-speed pulse cleaning and starting the second high-speed pulse cleaning is 5 seconds to 15 seconds; each flushing cycle takes 1 minute to 3 minutes; while the cleaning device is cleaning the heat exchanger core, the outside of the heat exchanger is constantly flushing the radiator shell of the heat exchanger at high speed through an atomizing nozzle array connected to the main pipe.

[0025] By adopting the above technical solution, the cleaning device in the present application can complete an efficient cleaning process in a short time and ensure the cleaning effect.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. In this application, two sets of pipes are set up to achieve intermittent pulse flushing, and combined with high-pressure gas to make the cleaning liquid turbulent, the water flow moves randomly, there is no flow rate attenuation phenomenon, it has the dual effects of chemical cleaning and physical cleaning, so the flushing effect will be better than traditional power cleaning.

[0027] 2. In this application, a turbulent flow field generated by a special high-pressure gas or cleaning liquid mixture is used to form strong impact, friction and dispersion effects, so as to achieve the purpose of quickly washing and removing dirt or oil stains on the surface of the heat exchanger core. At the same time, compared with ultrasonic cleaning methods, the degree of damage to the heat exchanger core is reduced.

[0028] 3. The device in this application adopts a controller for fully automatic control, and can also be manually operated. It has a high degree of automation, is easy to use, and has high cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of the device in this application.

[0030] Figure 2 It is a schematic diagram of the internal control structure of the device in this application.

[0031] In the figure: 1. Cabinet; 2. Liquid collecting tank; 3. Main pipe; 4. Clean water pipe; 5. First electric valve; 6. Second electric valve; 7. First branch pipe; 8. Second branch pipe; 9. Liquid pump; 10. Third electric valve; 11. Fourth electric valve; 12. First liquid storage tank; 13. Second liquid storage tank; 14. Third branch pipe; 15. Fourth branch pipe; 16. First high-speed liquid discharge and vent pipe; 17. Second high-speed liquid discharge and vent pipe; 18. Fifth electric valve; 19. Sixth electric valve; 20. Seventh electric valve; 21. Eighth electric valve; 22. Air compressor; 23. Air storage tank; 24. First solenoid valve; 25. Fifth branch pipe; 26. Atomizing nozzle array; 27. Second solenoid valve; 28. Liquid filter; 29. ​​Drain pipe; 30. Drain valve; 31. Air filter; 32. Safety valve; 33. Inspection port; 34. Inspection cover; 35. Control panel; 36. Display screen; 37. Control buttons. DETAILED DESCRIPTION

[0032] The following will be combined with the attached Figure 1 and attached Figure 2, the technical solutions in the embodiments of the present invention are clearly and completely described. The described embodiments are only possible technical implementations of the present invention, not all possible implementations. Those skilled in the art can completely combine the embodiments of the present invention to obtain other embodiments without creative work, and these embodiments are also within the scope of protection of the present invention.

[0033] Reference Figure 1 As shown, the aircraft environment control system heat exchanger cleaning device provided by the embodiment of the present application includes a cabinet 1, which is a closed rectangular structure and is made of stainless steel. A control panel 35 is provided near the upper part of the front side of the cabinet 1, and the control panel 35 has a display screen 36 and a plurality of control buttons 37. The display screen 36 can be displayed on a liquid crystal screen, and the display screen 36 displays the working process and the working status of the main power equipment. The control buttons 37 include the operation buttons required for work, the working current, the voltage and the main power switch button, etc. The control panel 35 can also be provided with necessary safety protection and alarm functions. Inspection ports 33 are provided on the left and right sides and / or the rear side of the cabinet 1, and an openable inspection cover 34 is provided at the inspection port 33.

[0034] Reference Figure 1 and Figure 2 As shown, the cleaning device in the present application also includes a control system, a liquid circulation and recovery system, a clean water flushing system and a pressurization system. The control system includes a controller and the above-mentioned control panel. The display screen and control buttons on the control panel are electrically connected to the controller. The controller can adopt a PLC controller or a single-chip microcomputer controller. The cabinet 1 is provided with a liquid collecting tank 2, two first liquid storage tanks 12 and two second liquid storage tanks 13, the liquid circulation and recovery system includes a main pipe 3 connected to the liquid collecting tank 2 and a first branch pipe 7 and a second branch pipe 8 connected to the main pipe 3, and the clean water flushing system includes a clean water pipe 4 connected to one side of the main pipe 3; a liquid filter 28 is provided in the liquid collecting tank 2, the inlet end of the main pipe 3 is connected to the liquid filter 28, the outlet end of the main pipe 3 is connected to the first branch pipe 7 and the second branch pipe 8, the first branch pipe 7 is connected to the two first liquid storage tanks 12 through branch pipes, and the second branch pipe 8 is connected to the two second liquid storage tanks 13 through branch pipes; a first electric valve 5 is provided on the main pipe 3 between the clean water pipe 4 and the liquid collecting tank 2, and a second electric valve 6 is provided on the clean water pipe 4; the clean water pipe 4 is connected to an external clean water tank or a tap water pipe, and is used to supply clean water to the main pipe 3.

[0035] Reference Figure 2As shown, a liquid pump 9 is provided on the main pipe 3 between the clean water pipe 4 and the first branch pipe 7 and the second branch pipe 8; a third electric valve 10 is provided on the first branch pipe 7, and a fourth electric valve 11 is provided on the second branch pipe 8; the two first liquid storage tanks 12 are connected to the third branch pipe 14, the third branch pipe 14 is used to be connected to the heat exchanger, each third branch pipe 14 is also connected to a first high-speed liquid discharge and vent pipe 16, and the first high-speed liquid discharge and vent pipe 16 is provided with a fifth electric valve 18; the two second liquid storage tanks 13 are connected to the fourth branch pipe 15, the fourth branch pipe 15 is used to be connected to the heat exchanger, and each fourth branch pipe 15 is connected to There is a second high-speed liquid discharge and vent pipe 17, on which a sixth electric valve 19 is provided; a seventh electric valve 20 is provided on each third branch pipe 14 between the first liquid storage tank 12 and the first high-speed liquid discharge and vent pipe 16, and an eighth electric valve 21 is provided on each fourth branch pipe 15 between the second liquid storage tank 13 and the second high-speed liquid discharge and vent pipe 17; two third branch pipes 14 and two fourth branch pipes 15 are respectively connected to the four sides of the heat exchanger, one of the third branch pipes 14 is arranged opposite to one of the fourth branch pipes 15, and the other third branch pipe 14 is arranged opposite to the other fourth branch pipe 15.

[0036] Reference Figure 2 As shown, the boosting system includes an air compressor 22 and an air tank 23 arranged in the cabinet 1. The air compressor 22 is used to inflate the air tank 23. An air filter 31 is arranged at the air inlet end of the air compressor 22. The air filter 31 can ensure the quality of air entering the air tank 23 and prevent impurities from entering and affecting the normal operation and cleaning effect of the system. A safety valve 32 is arranged on the air tank 23, which can automatically release pressure when the system pressure exceeds a predetermined value, ensure the safe operation of the equipment, and prevent equipment damage or safety accidents caused by excessive pressure. The air tank 23 is connected to the two first liquid storage tanks 12 and the two second liquid storage tanks 13 through air pipes, and a first solenoid valve 24 is arranged on the pipeline connecting the air tank 23 with the two first liquid storage tanks 12 and the two second liquid storage tanks 13, that is, each of the four air pipes is provided with an independently controlled first solenoid valve 24.

[0037] Reference Figure 2As shown, the main pipe 3 is also connected to a fifth branch pipe 25, and the outlet end of the fifth branch pipe 25 is provided with an atomizing nozzle array 26 for spraying liquid onto the heat exchanger shell; the fifth branch pipe 25 is provided with a second solenoid valve 27. The addition of the fifth branch pipe 25 and the atomizing nozzle array 26 can perform high-speed flushing of the heat exchanger shell while cleaning the heat exchanger core, further improving the comprehensiveness and thoroughness of the cleaning. The use of the atomizing nozzle array 26 ensures uniform spraying of the liquid and enhances the cleaning effect of dirt on the surface of the shell. In addition, through the control of the second solenoid valve 27, the precise control of the atomizing nozzle array 26 is achieved, which improves the automation and flexibility of the cleaning process.

[0038] Reference Figure 2 As shown, a drain pipe 29 is also connected to the bottom of one side of the liquid collecting tank 2, and a drain valve 30 is arranged on the drain pipe 29. The liquid collecting tank 2 is used to place a cleaning liquid containing a cleaning agent, and the cleaning liquid can be reused. A liquid filter 28 is arranged in the liquid collecting tank 2, which can effectively filter out impurities and dirt generated during the cleaning process, ensure the cleanliness of the cleaning liquid, prevent secondary pollution, and avoid pipe blockage. The setting of the drain pipe 29 facilitates the regular discharge of dirt in the liquid collecting tank 2 to keep the system clean and sanitary; the cleaning liquid can also be recycled through the drain pipe 29, which is more environmentally friendly. This design not only improves the cleaning effect, but also extends the service life of the equipment and reduces maintenance costs.

[0039] In the present application, the liquid storage tank is a cylindrical pressure-bearing structure used to support the cabinet 1; the cabinet 1, the main pipe 3, the first branch pipe 7, the second branch pipe 8, the third branch pipe 14 and the fourth branch pipe 15 are all made of stainless steel; the cabinet 1 is also provided with a flexible interface for connecting the third branch pipe 14 and the fourth branch pipe 15 with the heat exchanger; in the present application, the cabinet 1 is divided into an upper and lower layer, the liquid collecting tank 2, the liquid pump 9, the air compressor 22 and the air storage tank 23 are arranged in the lower space of the cabinet 1, and the first liquid storage tank 12, the second liquid storage tank 13 and various branch pipes are arranged in the upper space of the cabinet 1; this not only optimizes the spatial layout, improves the compactness and neatness of the equipment, but also facilitates maintenance and inspection.

[0040] The cleaning device in this application is used as a cleaning device for heat exchanger products in the environmental control system. Its main performance indicators are as follows: a). Cleaning time ≤ 30 minutes.

[0041] b). The pump’s liquid supply flow rate Q=0~200L / min.

[0042] c). Working temperature: 4℃~55℃.

[0043] d). Gas supply pressure 0.25MPa±0.05MPa.

[0044] The cleaning device in this application adopts a cabinet structure and PLC control, with a simple appearance and easy operation. It adopts pulse-turbulent cleaning technology, tangential impact along the flow channel, short cleaning time, high cleanliness, and avoids the damage of ultrasonic cleaning to the protective layer on the surface of the heat exchanger fins.

[0045] During use, the machine can be operated with one button for cleaning and source cleaning, which can be unattended, avoiding repeated disassembly and handling in conventional cleaning, and saving human resource costs. It can be applied to the cleaning of most aircraft heat exchangers. For large heat exchangers such as B777 and A380, automatic cleaning can be achieved after external pipe transfer.

[0046] The present application also discloses a method for cleaning a heat exchanger in an aircraft environment control system. The heat exchanger in the aircraft environment control system is cleaned using the above-mentioned cleaning device. The cleaning method comprises the following steps: S1: A cleaning liquid containing a cleaning agent is placed in the liquid collecting tank 2; a clean water pipe 4 is connected to an external clean water tank or a tap water pipe; S2: Start the power switch, the control system opens the first electric valve 5 on the main pipe 3, opens the third electric valve 10 on the first branch pipe 7, opens the seventh electric valve 20 on the third branch pipe 14; synchronously closes the second electric valve 6 on the clean water pipe 4, closes the fourth electric valve 11 on the second branch pipe 8, closes the fifth electric valve 18 on the first high-speed liquid discharge pipe 16, closes the sixth electric valve 19 on the second high-speed liquid discharge pipe 17, and closes the eighth electric valve 21 on the fourth branch pipe 15; S3: The control system turns on the liquid pump 9 to start working. The neutral cleaning liquid that meets the CMM requirements in the liquid collecting tank 2 is supplied to the corresponding side channels of the heat exchanger and the first liquid storage tank 12 under the action of the liquid pump 9; S4: When the first liquid storage tank 12 is filled with cleaning liquid, the control system closes the third electric valve 10 on the first branch pipe 7, and simultaneously opens the first solenoid valve 24 provided on the pipeline between the gas storage tank 23 and the first liquid storage tank 12, and then the control system instantaneously opens the sixth electric valve 19 on the second high-speed liquid discharge pipe 17, and the cleaning liquid flows through the heat exchanger core at a high speed under the action of gas pressure, completing the first high-speed pulse cleaning, and the sprayed cleaning liquid flows back to the liquid collection tank 2 through the collection hose; S5: After that, the control system closes the first solenoid valve 24 provided on the pipeline between the gas storage tank 23 and the first liquid storage tank 12, closes the sixth electric valve 19 on the second high-speed liquid discharge vent pipe 17, and closes the seventh electric valve 20 on the third branch pipe 14; simultaneously opens the fourth electric valve 11 on the second branch pipe 8, and opens the eighth electric valve 21 on the fourth branch pipe 15; and fills the heat exchanger core and the second liquid storage tank 13 with liquid through the liquid pump 9; S6: When the second liquid storage tank 13 is filled with cleaning liquid, the control system opens the first solenoid valve 24 provided on the pipeline between the gas storage tank 23 and the second liquid storage tank 13, and then the control system instantly opens the fifth electric valve 18 on the first high-speed liquid discharge pipe 16, and the cleaning liquid flushes the heat exchanger core at a high speed under the action of gas pressure, completing a flushing cycle; S7: After the above steps S2 to S6, 8 to 12 flushing cycles are performed, and then the control system closes the first electric valve 5 on the main pipe 3, and simultaneously opens the second electric valve 6 on the clean water pipe 4, switching to external clean water for flushing; finally, the heat exchanger core is flushed clean.

[0047] In the above steps S4 and S6 of the present application, the pressure in the liquid storage tank cavity needs to reach 0.25MPa±0.05MPa, and the pressure in the liquid storage tank is detected and controlled by the system pressure sensor. In steps S4 and S5, the time between completing the first high-speed pulse cleaning and starting the second high-speed pulse cleaning is 5 seconds to 15 seconds, for example, 10 seconds; each flushing cycle is completed in 1 minute to 3 minutes, for example, 2 minutes; while the cleaning device is cleaning the heat exchanger core, the outside of the heat exchanger is constantly flushing the radiator shell of the heat exchanger at high speed through the atomizing nozzle array 26 connected to the main pipe 3. The cleaning device in the present application can complete an efficient cleaning process in a short time and ensure the cleaning effect.

[0048] In this application, each cycle takes about 2 minutes, and 10 cycles can clean the heat exchanger core. When cleaning with an external water source, the cleaning liquid has been stored in an external liquid storage tank, and the tap water after flushing is directly discharged to the sewer without recycling. In this application, a turbulent flow field generated by a special high-pressure gas or cleaning liquid mixture is used to form a strong impact, friction and dispersion effect, so as to achieve the purpose of quickly washing and removing dirt or oil stains on the surface of the heat exchanger core. At the same time, compared with the ultrasonic cleaning method, the degree of damage to the heat exchanger core is reduced.

[0049] The cleaning device and cleaning method in the present application can be used for cleaning aircraft environmental control, fuel and hydraulic system radiator products. It can also be used for air tightness test of aircraft environmental control and fuel system heat exchanger products. It can also be used for pressure alternation test of heat exchanger products. After replacing the pressure source, the bursting pressure test of heat exchanger products can also be carried out.

[0050] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A cleaning device for a heat exchanger in an aircraft environmental control system, comprising a cabinet (1), characterized in that: A liquid collecting box (2) is arranged in the cabinet (1), the liquid collecting box (2) is connected to a main pipe (3), and one side of the main pipe (3) is connected to a clean water pipe (4); A first electric valve (5) is provided on the main pipe (3) between the clean water pipe (4) and the liquid collecting tank (2), and a second electric valve (6) is provided on the clean water pipe (4); The main pipe (3) is connected to a first branch pipe (7) and a second branch pipe (8); a liquid pump (9) is provided on the main pipe (3) between the clean water pipe (4) and the first branch pipe (7) and the second branch pipe (8); a third electric valve (10) is provided on the first branch pipe (7), and a fourth electric valve (11) is provided on the second branch pipe (8); The first branch pipe (7) is connected to a first liquid storage tank (12); the second branch pipe (8) is connected to a second liquid storage tank (13); the first liquid storage tank (12) is connected to a third branch pipe (14) for communicating with one end of a heat exchanger, the third branch pipe (14) is connected to a first high-speed liquid discharge and vent pipe (16), and the first high-speed liquid discharge and vent pipe (16) is provided with a fifth electric valve (18); the second liquid storage tank (13) is connected to a fourth branch pipe for communicating with the other end of the heat exchanger (15), the fourth branch pipe (15) is connected to a second high-speed liquid discharge and emptying pipe (17) and a sixth electric valve (19) is provided on the second high-speed liquid discharge and emptying pipe (17); a seventh electric valve (20) is provided on the third branch pipe (14) between the first liquid storage tank (12) and the first high-speed liquid discharge and emptying pipe (16), and an eighth electric valve (21) is provided on the fourth branch pipe (15) between the second liquid storage tank (13) and the second high-speed liquid discharge and emptying pipe (17); An air compressor (22) and an air storage tank (23) are also provided in the cabinet (1); the air compressor (22) is used to inflate the air storage tank (23); the air storage tank (23) is connected to the first liquid storage tank (12) and the second liquid storage tank (13); and a first solenoid valve (24) is provided on the pipeline connecting the air storage tank (23) and the first liquid storage tank (12) and the second liquid storage tank (13).

2. The cleaning device for a heat exchanger in an aircraft environmental control system according to claim 1, characterized in that: The main pipe (3) is also connected to a fifth branch pipe (25), and an atomizing nozzle array (26) for spraying liquid onto the heat exchanger shell is arranged at the outlet end of the fifth branch pipe (25); and a second solenoid valve (27) is arranged on the fifth branch pipe (25).

3. The cleaning device for a heat exchanger in an aircraft environmental control system according to claim 1 or 2, characterized in that: The first branch pipe (7) is connected to two first liquid storage tanks (12) through branch pipes, and each of the first liquid storage tanks (12) is connected to the heat exchanger through a third branch pipe (14); the second branch pipe (8) is connected to two second liquid storage tanks (13) through branch pipes, and each of the second liquid storage tanks (13) is connected to the heat exchanger through a fourth branch pipe (15); the two third branch pipes (14) and the two fourth branch pipes (15) are respectively connected to the four sides of the heat exchanger, and the third branch pipes (14) and the fourth branch pipes (15) are arranged opposite to each other.

4. The cleaning device for a heat exchanger in an aircraft environmental control system according to claim 1 or 2, characterized in that: A liquid filter (28) is arranged in the liquid collecting box (2), and the inlet end of the main pipe (3) is connected to the liquid filter (28); a sewage pipe (29) is also connected to the bottom of one side of the liquid collecting box (2), and a sewage valve (30) is arranged on the sewage pipe (29).

5. The cleaning device for a heat exchanger in an aircraft environmental control system according to claim 1 or 2, characterized in that: An air filter (31) is provided at the air inlet end of the air compressor (22); and a safety valve (32) is provided on the air storage tank (23).

6. The cleaning device for a heat exchanger in an aircraft environmental control system according to claim 1 or 2, characterized in that: The cabinet (1) is divided into two layers, the upper and lower layers; the liquid collecting box (2), the liquid pump (9), the air compressor (22) and the gas storage tank (23) are arranged in the lower layer space of the cabinet (1); the first liquid storage box (12), the second liquid storage box (13) and various branch pipes are arranged in the upper layer space of the cabinet (1); The cabinet (1) has a control panel (35) on the front side, the control panel (35) has a display screen (36) and a plurality of control buttons (37), and the cabinet (1) has inspection openings (33) on the left and right sides and / or the rear side, and the inspection openings (33) are provided with an openable inspection cover (34).

7. The cleaning device for a heat exchanger in an aircraft environment control system according to claim 1 or 2, characterized in that: The liquid storage tank is a cylindrical pressure-bearing structure used to support the cabinet (1); The cabinet (1), the main pipe (3), the first branch pipe (7), the second branch pipe (8), the third branch pipe (14) and the fourth branch pipe (15) are all made of stainless steel; the cabinet (1) is also provided with a flexible interface for connecting the third branch pipe (14) and the fourth branch pipe (15) with the heat exchanger; The cleaning device also includes a controller.

8. A method for cleaning a heat exchanger in an aircraft environmental control system, characterized in that: The heat exchanger in the aircraft environment control system is cleaned by using the cleaning device described in any one of claims 1 to 7, and the cleaning method comprises the following steps: S1: a cleaning liquid containing a cleaning agent is placed in a liquid collecting tank (2); a clean water pipe (4) is connected to an external clean water tank or a tap water pipe; S2: Start the power switch, the control system opens the first electric valve (5) on the main pipe (3), opens the third electric valve (10) on the first branch pipe (7), and opens the seventh electric valve (20) on the third branch pipe (14); synchronously closes the second electric valve (6) on the clean water pipe (4), closes the fourth electric valve (11) on the second branch pipe (8), closes the fifth electric valve (18) on the first high-speed liquid discharge pipe (16), closes the sixth electric valve (19) on the second high-speed liquid discharge pipe (17), and closes the eighth electric valve (21) on the fourth branch pipe (15); S3: the control system turns on the liquid pump (9) to start working, and the neutral cleaning liquid that meets the requirements of the CMM in the liquid collecting tank (2) is supplied to the corresponding side channels of the heat exchanger and the first liquid storage tank (12) under the action of the liquid pump (9); S4: When the first liquid storage tank (12) is filled with cleaning liquid, the control system closes the third electric valve (10) on the first branch pipe (7), and simultaneously opens the first solenoid valve (24) provided on the pipeline between the gas storage tank (23) and the first liquid storage tank (12), and then the control system instantly opens the sixth electric valve (19) on the second high-speed liquid discharge pipe (17), and the cleaning liquid flows through the heat exchanger core at a high speed under the action of gas pressure, completing the first high-speed pulse cleaning, and the sprayed cleaning liquid flows back to the liquid collection tank (2) through the collection hose; S5: Afterwards, the control system closes the first solenoid valve (24) provided on the pipeline between the gas storage tank (23) and the first liquid storage tank (12), closes the sixth electric valve (19) on the second high-speed liquid discharge vent pipe (17), and closes the seventh electric valve (20) on the third branch pipe (14); simultaneously opens the fourth electric valve (11) on the second branch pipe (8), and opens the eighth electric valve (21) on the fourth branch pipe (15); and fills the heat exchanger core and the second liquid storage tank (13) with liquid through the liquid pump (9); S6: When the second liquid storage tank (13) is filled with cleaning liquid, the control system opens the first solenoid valve (24) provided on the pipeline between the gas storage tank (23) and the second liquid storage tank (13), and then the control system instantly opens the fifth electric valve (18) on the first high-speed liquid discharge pipe (16), and the cleaning liquid flushes the heat exchanger core at a high speed under the action of gas pressure, completing a flushing cycle; S7: After the above steps S2 to S6, 8 to 12 flushing cycles are performed, and then the control system closes the first electric valve (5) on the main pipe (3), and simultaneously opens the second electric valve (6) on the clean water pipe (4), switching to external clean water for flushing; finally, the heat exchanger core is flushed clean.

9. The method for cleaning a heat exchanger in an aircraft environmental control system according to claim 8, characterized in that: In the above steps S4 and S6, the pressure in the liquid storage tank cavity needs to reach 0.25MPa±0.05MPa, and the pressure in the liquid storage tank is detected and controlled by a system pressure sensor.

10. The method for cleaning a heat exchanger in an aircraft environmental control system according to claim 8, characterized in that: In steps S4 and S5, the time between the completion of the first high-speed pulse cleaning and the start of the second high-speed pulse cleaning is 5 seconds to 15 seconds; each flushing cycle takes 1 minute to 3 minutes to complete; while the cleaning device is cleaning the heat exchanger core, the outside of the heat exchanger is constantly flushing the radiator shell of the heat exchanger at high speed through the atomizing nozzle array (26) connected to the main pipe (3).

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