A method of oil containment for an aeroengine

Abstract

The application discloses an oil sealing method for an aero-engine, which adopts a ground power oil sealing device to seal an engine to be sealed, and comprises the following processes: S1, dehydrating oil sealing oil after heating; S2, cooling the oil sealing oil; and S3, sealing the engine to be sealed. The oil sealing method can meet the requirement of ground oil sealing of the aero-engine by configuring a vehicle body assembly, and can not only meet the requirements of self-circulation filtering and cleaning, heating and dehydrating, cooling and oil sealing of the oil sealing oil, but also can realize the requirements of nitrogen filling and oil removal by the hydraulic control system and the electrical control system installed in the vehicle body assembly, so that the convenience and efficiency of operation of maintenance personnel are greatly improved, the working strength and the oil sealing cost are reduced, and the oil sealing method is suitable for popularization and application.

Description

Technical Field

[0001] The present invention relates to the technical field of aviation engines, and in particular to an oil sealing method for aviation engines. Background Art

[0002] According to aircraft engine maintenance procedures, engines that have not been used for an extended period must undergo an oil seal before being stored. The primary function of the oil seal is to inject aviation oil into the entire engine fuel system, allowing the sealant to seal the combustion chamber, turbine components, and diffuser surfaces. This prevents rust on the fuel system components, which could lead to system failure. When the aircraft engine is needed, it is unsealed and the fuel system is flushed with fuel to remove any remaining oil. This also removes air from the fuel system and verifies the system's tightness. This oil sealing and unsealing process ensures the integrity of the engine during storage and ensures normal operation after unsealing.

[0003] Engines stored in ground warehouses for extended periods require re-sealing every six months, according to relevant engine maintenance standards. Currently, there are two main methods for sealing domestic aircraft engines: re-assembling the engine to be sealed onto a functioning aircraft, or sending it to a repair shop for sealing. Both existing methods have their own drawbacks. For on-board sealing, a working engine must be towed from the aircraft, then the engine to be sealed must be installed and sealed. After sealing is complete, the original engine can be re-installed and re-seated. This requires re-assembling the engine at least four times to complete the sealing process, resulting in a high workload and a long cycle time. Each engine takes approximately two to three days to seal, and multiple engine installations and removals can cause unnecessary damage. When there are a large number of ground-based engines, sealing can require prolonged use of working aircraft, severely limiting aircraft availability. For repair shop sealing, the engine must be loaded onto a truck and transported to the repair shop before being returned. This process is both time-consuming and expensive, with each engine taking approximately 20 days to seal. The engine needs to be transported and assembled and disassembled twice on the test bench, which may cause damage. Furthermore, the proper allocation of resources is required for each engine on the test bench, which not only affects the oil seal work but also the normal work progress of the repair shop.

[0004] After searching, the patent document with application publication number CN118242437A discloses a ground oil sealing method for aircraft engines, while the patent document with application publication number CN 117550542 A discloses an aircraft engine oil sealing vehicle and oil sealing method. From the contents disclosed in the two retrieved patent documents, it can be seen that each provides an oil sealing method that meets the requirements of the engine from different perspectives. In order to be able to meet the requirements of oil sealing work of the engine on the ground, there is no need to perform it on a test bench or on an aircraft, thereby reducing the cost and cycle of oil sealing, thereby providing an oil sealing method different from the prior art disclosed, so as to meet the requirements of oil sealing work of the engine on the ground. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the problems existing in the background technology. In order to meet the oil sealing work of the engine on the ground, an oil sealing method is provided. By configuring ground dynamic oil sealing equipment, there is no need to perform oil sealing operations on a test bench or an aircraft. This can not only improve work efficiency, but also reduce oil sealing costs and cycles, so as to meet the use requirements of the engine. Specifically, it is an oil sealing method for aircraft engines.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: an oil sealing method for an aircraft engine, wherein the oil sealing method uses a ground-based dynamic oil sealing device to seal the engine to be oil-sealed, and includes the following steps:

[0007] S1. Dehydrating the oil seal oil after heating;

[0008] S2. Cooling the oil seal oil;

[0009] S3. Treat the oil-sealed engine as oil-sealed;

[0010] The ground power oil seal device includes a vehicle body assembly and a hydraulic control system installed in the vehicle body assembly. The hydraulic control system includes an oil tank, an oil pump, a quick-change joint, an oil filling hose, an oil inlet hose, an air charging joint and a control valve. The control valve includes a solenoid valve, a one-way valve and a throttle valve. A heating device for heating and dehydrating the oil seal oil is provided in the oil tank.

[0011] The outlet end of the oil tank is provided with a main pipeline, and the inlet end of the oil tank is provided with an oil return socket. In the main pipeline, a solenoid valve A, a solenoid valve B, a throttle valve and a check valve A are sequentially connected in series along the delivery direction of the oil seal oil. The oil pump is installed on the main pipeline between the solenoid valves A and B. The quick-change joint is installed on the output end of the oil injection hose. The input end of the oil injection hose is connected to the main pipeline at the output end of the check valve A. The quick-change joint is detachably connected to the engine to be oil-sealed or the oil return socket. The quick-change joint is used to achieve oil sealing of the engine to be oil-sealed or self-circulating filtration and cleaning of the oil seal oil in the oil tank.

[0012] The hydraulic control system further includes an oil inlet pipeline, a cooling pipeline and a nitrogen filling and oil removal pipeline communicating with the main pipeline, wherein:

[0013] The input end of the oil inlet pipeline is connected to the main pipeline between the solenoid valve A and the throttle valve, and the output end is connected to the solenoid valve B. The oil inlet hose is connected to the oil inlet pipeline through an oil pump. The oil source for the oil seal is connected to the oil inlet hose to inject oil seal oil into the oil tank to achieve oil seal oil filling;

[0014] The input end of the cooling pipeline is connected to the solenoid valve A, and the output end thereof is detachably connected to the oil return socket. A heat dissipation device is installed in the cooling pipeline, and a one-way valve B is connected in series in the cooling pipeline at the front end of the heat dissipation device. The heat dissipation device is used to cool the oil seal oil in the oil tank to achieve temperature reduction and cooling.

[0015] The output end of the nitrogen-filled oil-removing pipeline is connected to the main pipeline of the output end of the one-way valve A, the charging joint is installed at the input end of the nitrogen-filled oil-removing pipeline, and a one-way valve C is also installed in the nitrogen-filled oil-removing pipeline. An external nitrogen source is connected through the charging joint to discharge the oil in the engine to be oil-sealed, thereby realizing nitrogen filling and oil removal.

[0016] Furthermore, using the oil sealing method for an aircraft engine described in the present invention, an oil filter device is further installed in the main line, and the oil filter device includes a filter A and a filter B. Both the filter A and the filter B are stainless steel mesh filters, and their filter elements are stainless steel mesh with a filtration accuracy of 5μm; wherein the filter A is installed in the main line between the solenoid valve A and the throttle valve, and the filter B is installed in the main line between the oil pump and the solenoid valve B;

[0017] The input end of the oil inlet pipeline is connected to the main pipeline between the filter A and the throttle valve, and the output end of the oil inlet hose is connected to the main pipeline between the solenoid valve B and the filter B. A control valve is also installed at the input end of the oil inlet hose. The control valve is a ball valve, and a refueling connector is configured in the ball valve. The oil inlet hose is connected to an oil source for oil seals through the refueling connector. Under the action of the oil pump, oil seal oil is injected into the oil tank through the oil inlet pipeline; wherein, the solenoid valve A and the solenoid valve B both adopt two-position three-way explosion-proof solenoid valves.

[0018] Furthermore, using the oil sealing method for an aircraft engine described in the present invention, a control valve is also installed in the main line, the control valve is a sampling valve, and the sampling valve is installed on the main line at the output end of the one-way valve A; the nitrogen filling and oil removal pipeline is connected to the main line at the rear end of the sampling valve.

[0019] Furthermore, an oil sealing method for an aircraft engine described in the present invention is adopted, and an air filter device and two control valves are connected in series in the nitrogen filling and oil removal pipeline along the gas flow direction. The two control valves are a pressure reducing valve and a reversing valve, respectively. The pressure reducing valve and the reversing valve are installed in sequence in the nitrogen filling and oil removal pipeline along the gas flow direction. A nitrogen source is externally connected through the inflation joint, and the nitrogen in the nitrogen source passes through the air filter device, the pressure reducing valve, the reversing valve and the one-way valve C in sequence, and is finally connected to the engine to be oil-sealed through a quick-change joint. The nitrogen transported by the nitrogen filling and oil removal pipeline is used to discharge the oil in the engine to be oil-sealed, thereby realizing nitrogen filling and oil removal of the engine to be oil-sealed; wherein, the air filter device adopts a gas filter, and the reversing valve adopts a two-position two-way electromagnetic reversing valve.

[0020] Furthermore, an oil sealing method for an aircraft engine described in the present invention is adopted, wherein the heating device is a heating tube, and the heating tube is composed of three groups of annular heating tubes connected in parallel, and the three groups of heating tubes are arranged in parallel in the middle and lower part of the inner wall of the oil tank; the heat dissipation device is a radiator, and the radiator includes heat dissipation fins and a convection fan located on one side of the heat dissipation fins, and the radiator is installed in a cooling pipeline connected to the solenoid valve A, and a cooling pipe joint is provided in the cooling pipeline at the output end of the one-way valve B, and the cooling pipeline is detachably connected to the return oil socket through the cooling pipe joint, and the radiator is used to cool the oil seal oil in the oil tank.

[0021] Furthermore, an oil sealing method for an aircraft engine described in the present invention is adopted, and the hydraulic control system also includes a pressure relief line connected to the main line, and the pressure relief line includes a first pressure relief line and a second pressure relief line, the inlet end of the first pressure relief line is connected to the main line at the oil pump outlet end, and the inlet end of the second pressure relief line is connected to the main line at the throttle valve output end, and pressure relief pipe joints are provided at the outlet ends of the first pressure relief line and the second pressure relief line, and the first pressure relief line and the second pressure relief line are detachably connected to the return oil socket through corresponding pressure relief pipe joints; a control valve is respectively installed in the first pressure relief line and the second pressure relief line, and the control valve is a relief valve, and the relief valve includes a first relief valve and a second relief valve; wherein, the first relief valve is installed in the first pressure relief line, and the second relief valve is installed in the second pressure relief line.

[0022] Furthermore, the oil sealing method for an aircraft engine described in the present invention is adopted, wherein the vehicle body assembly includes a frame body, two fixed wheels and two universal wheels installed at the bottom of the frame body, and a normally open door and a maintenance door arranged on the side of the frame body, and a tow bar is also installed at the front end of the frame body; the hydraulic control system is installed in the frame body, and a control valve is provided at the bottom of the oil tank, and the control valve is an oil drain ball valve, which is used to drain the residual oil seal oil in the oil tank.

[0023] Furthermore, using the oil sealing method for an aircraft engine according to the present invention, the ground dynamic oil sealing device further includes an electrical control system installed in the vehicle body assembly, the electrical control system includes a power supply system, a control system, a collection system and an operation panel, the power supply system is electrically connected to the control system, the collection system and the operation panel respectively, and is used to provide working power to the control system, the collection system and the operation panel; wherein,

[0024] The acquisition system includes an integrator and sensors, the sensors including a pressure sensor, a temperature sensor, a liquid level sensor, and a flow sensor, the pressure sensor, temperature sensor, liquid level sensor, and flow sensor being electrically connected to the integrator respectively. The pressure sensor includes a first pressure sensor disposed in the main pipe at the outlet of the solenoid valve A, and a second pressure sensor disposed in the main pipe at the outlet of the check valve A; the temperature sensor and liquid level sensor are respectively installed in the oil tank; and the flow sensor is installed in the main pipe between the check valve A and the throttle valve;

[0025] The acquisition system detects the oil seal status and the oil seal status in real time through a pressure sensor, a temperature sensor, a liquid level sensor and a flow sensor, and feeds back to the control system through an integrator. The control system controls the oil pump, the heating device, the heat dissipation device and the control valve based on the feedback value of the acquisition system;

[0026] The control system includes a manual control system, a programmable PLC control system and a switching module. The manual control system and the programmable PLC control system can be switched to manual or automatic mode through the switching module. The control system is respectively connected to the oil pump, the heating device, the heat dissipation device and the control valve;

[0027] The operation panel includes a human-computer interaction touch interface, an operation switch, an integrator display screen, an indicator light and an audible and visual alarm. The operation switch includes a power switch, an emergency stop button and a toggle switch. The integrator display screen is electrically connected to the integrator in the acquisition system. The control system is electrically connected to the operation panel. The human-computer interaction touch interface in the operation panel is used to display the feedback value of the acquisition system and perform human-computer interaction operations. The audible and visual alarm emits an audible and visual alarm prompt based on the feedback value of the acquisition system.

[0028] Furthermore, using the oil sealing method for an aircraft engine according to the present invention, in the process S1, the specific method of heating and then dehydrating the oil seal oil is:

[0029] Connect the oil source to the refueling joint, inject the oil seal oil into the oil tank, power on the entire ground power oil seal equipment, press the operation switch on the operation panel, and use the control system to perform the dehydration operation in manual or automatic mode;

[0030] The oil level sensor in the oil tank is used to monitor the oil level information, and the level value is fed back to the control system and displayed on the human-machine interactive touch interface of the operation panel;

[0031] If the oil in the tank is insufficient and the liquid level is low, the sound and light alarm will sound an alarm and the heating device will not start;

[0032] If there is sufficient oil in the tank and the water content of the oil does not meet the oil seal requirements, that is, the water content of the oil is greater than 300ppm, the heating device is started to heat the oil seal oil in the tank; the oil temperature in the tank is monitored by a temperature sensor, and the monitoring value is fed back to the control system; when the oil temperature reaches the set value of 105℃, the heating device is turned off and heating is stopped, and the high temperature is used to evaporate the water in the oil to ensure that the water content of the oil meets the oil seal requirements; at the same time, the indicator light flashes green to indicate that the oil is qualified, and the human-computer interactive touch interface prompts that the dehydration is completed; when the oil temperature exceeds 120℃, the indicator light flashes red, and an over-temperature alarm is issued through the sound and light alarm, and the temperature information is displayed on the human-computer interactive touch interface, and the heating device is disconnected at the same time;

[0033] If the water content of the oil meets the oil seal requirements, that is, the water content of the oil is not more than 300ppm, start the heating device to heat the oil seal oil in the oil tank to 40℃~80℃;

[0034] In the process S2, the specific method for cooling the oil seal oil is:

[0035] Press the operation switch on the operation panel and, under the control of the control system, adopt manual or automatic mode to perform cooling operation;

[0036] The control system controls the solenoid valve A and the solenoid valve B to be in an open state; uses the liquid level sensor in the oil tank to monitor the oil level information; and uses the temperature sensor to monitor the oil temperature information in the oil tank, and feeds the monitoring value back to the control system and displays it on the human-computer interactive touch interface;

[0037] If the oil level in the tank is low, the indicator light will flash yellow to indicate low oil level, and the oil temperature and level information will be displayed on the human-machine interactive touch interface. The oil pump and cooling device will not start.

[0038] If the oil level is sufficient and the oil temperature is ≤80℃, the indicator light will flash yellow to indicate that the oil temperature is low; the oil temperature will be displayed on the human-machine interactive touch interface, and the oil pump and cooling device will not start;

[0039] If the oil volume is sufficient and the oil temperature is greater than 80°C, start the oil pump, radiator and one-way valve B, so that the oil in the tank passes through the solenoid valve A, filter B, oil pump, solenoid valve B and radiator in sequence, and finally returns to the tank through the one-way valve B, achieving continuous circulation cooling. When the oil temperature in the tank is 40°C ≤ oil temperature ≤ 80°C, turn off the oil pump and radiator, and the indicator light flashes green to indicate that the cooling is complete. The display on the human-machine interactive touch interface shows that the cooling is complete.

[0040] In the process S3, the specific method of oil sealing the oil-sealed engine is as follows:

[0041] Press the operation switch on the operation panel and, under the control of the control system, operate the oil seal in manual or automatic mode;

[0042] The control system controls the solenoid valve A and the solenoid valve B to be in an open state;

[0043] The oil level information is monitored using a level sensor in the oil tank; the oil temperature in the oil tank is monitored using a temperature sensor; and the oil pressure in the main line is monitored using a first pressure sensor and a second pressure sensor. The monitored values ​​are fed back to the control system and displayed on a human-computer interactive touch interface.

[0044] If the oil level in the tank is low, the indicator light will flash yellow to indicate the low oil level. The level information will be displayed on the human-computer interactive touch interface, and the oil pump will not start.

[0045] When the oil volume is sufficient and the oil temperature is less than 40°C or greater than 80°C, the indicator light flashes yellow to indicate abnormal oil temperature. The oil temperature is displayed on the human-machine interactive touch interface, and the oil pump does not start.

[0046] When the oil volume is sufficient and the oil temperature is between 40℃≤oil temperature≤80℃, insert the quick-release connector into the engine oil filling port, start the oil pump, throttle valve and one-way valve A, and allow the oil in the fuel tank to pass through the solenoid valve A, filter B, oil pump, solenoid valve B, filter A and throttle valve in sequence, and then enter the oil filling hose through the one-way valve A, and finally be injected into the engine through the quick-release connector to complete the oil sealing operation.

[0047] Furthermore, using the oil sealing method for an aircraft engine according to the present invention, in the process S1, the specific method of injecting the oil sealing oil into the oil tank is:

[0048] Press the operating switch on the operation panel and, under the control of the control system, perform refueling in manual or automatic mode;

[0049] The control system controls the solenoid valve A and the solenoid valve B to be in an open state;

[0050] First, connect the oil barrel to the refueling joint, start the oil pump and ball valve, and let the oil in the barrel pass through the ball valve, oil inlet hose, filter B, oil pump, solenoid valve B and filter A in sequence, and finally be injected into the fuel tank through the oil inlet pipeline and solenoid valve A until the injected oil reaches the liquid level requirement, thus completing the refueling operation of the fuel tank;

[0051] Meanwhile, in the process S1, before the oil seal oil is heated and dehydrated, if the oil quality of the oil seal oil in the oil tank does not meet the oil seal requirements, the oil seal oil needs to be filtered and cleaned. The specific method of the filtering and cleaning process is as follows:

[0052] Press the operation switch on the operation panel and, under the control of the control system, perform the filter cleaning operation in manual or automatic mode;

[0053] The control system controls the solenoid valve A and the solenoid valve B to be in an open state;

[0054] First, insert the quick-release connector into the oil return socket, start the oil pump, throttle valve and check valve A, and allow the oil in the oil tank to pass through the solenoid valve A, filter B, oil pump, solenoid valve B, filter A, throttle valve and check valve A in sequence, and finally return to the oil tank through the oil filling hose. Through continuous circulation and filtration, until the oil quality of the oil seal oil meets the oil seal requirements, use the filter B and filter A in the main line to achieve self-circulating filtration and cleaning of the oil seal oil in the oil tank;

[0055] In addition, in the process S3, before oil sealing the engine to be oil-sealed, if the original oil sealing oil in the engine to be oil-sealed does not meet the requirements, it is necessary to discharge the original oil sealing oil in the engine to be oil-sealed to avoid mixing of the injected oil sealing oil with the original oil sealing oil, thereby affecting the engine. A nitrogen filling and oil removal method is adopted to discharge the oil in the engine to be oil-sealed. The specific method of nitrogen filling and oil removal is as follows:

[0056] Press the operation switch on the operation panel and, under the control of the control system, adopt manual or automatic mode to perform nitrogen filling and oil removal operation;

[0057] The control system controls the one-way valve C, the reversing valve and the pressure reducing valve to be in an open state;

[0058] First, insert the quick-release connector into the engine to be oil-sealed, then connect the external nitrogen source through the inflation connector, and finally start the external nitrogen source so that the nitrogen in the nitrogen source passes through the air filter device, pressure reducing valve, reversing valve and one-way valve C in the air injection pipeline in sequence, and finally is injected into the engine through the quick-release connector in the oil injection hose to discharge the oil in the engine to be oil-sealed and realize nitrogen filling and oil removal.

[0059] The oil sealing method for aircraft engines according to the present invention has the following advantages compared to the prior art: by configuring the ground power oil sealing equipment, the hydraulic control system and the electrical control system can be installed in the vehicle body assembly, which can meet the oil sealing work of the engine on the ground, without having to be performed on a test bench or on an aircraft, thereby reducing the oil sealing cost and cycle; at the same time, by configuring the electrical control system, real-time pressure and temperature measurement and intelligent control are achieved, greatly improving the efficiency of the ground oil sealing of the aircraft engine. It can be seen that the oil sealing method according to the present invention can meet the ground oil sealing requirements of the aircraft engine by configuring the vehicle body assembly, and by installing the hydraulic control system and the electrical control system in the vehicle body assembly, not only can the oil seal oil self-circulation filtration and cleaning, heating and dehydration, cooling and oil sealing requirements be met, but also the nitrogen filling and deoiling requirements can be achieved, greatly improving the convenience and maintenance efficiency of the maintenance personnel, and reducing the workload and oil sealing costs, making it suitable for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] The present invention will be described in further detail below with reference to the accompanying drawings.

[0061] Figure 1 It is a schematic diagram of the connection of various components in the ground power oil seal equipment of the present invention;

[0062] Figure 2 It is a schematic block diagram of the structure of the electrical control system of the present invention;

[0063] Figure 3 It is a power supply principle diagram of the power supply system described in the present invention;

[0064] Figure 4 is a control flow chart of the acquisition system of the present invention;

[0065] Figure 5 It is an electrical control principle diagram of the electrical control system of the present invention;

[0066] Figure 6 This is a flow chart of the oil sealing process of the control system in the automatic mode of the present invention;

[0067] Figure 7 It is a layout structure diagram of the human-computer interaction interface described in the present invention;

[0068] Figure 8 This is a panel structure diagram of the display screen of the integrator described in the present invention;

[0069] Figure 9 It is the physical object of the vehicle body assembly described in the present invention Figure 1 ;

[0070] Figure 10 It is the physical object of the vehicle body assembly described in the present invention Figure 2 ;

[0071] Figure 11 It is the physical object of the vehicle body assembly described in the present invention Figure 3 ;

[0072] Figure 12 It is the physical object of the vehicle body assembly described in the present invention Figure 4 .

[0073] As shown in the figure: 1-quick-change connector, 2-oil filling hose, 3-second pressure sensor, 4-sampling valve, 5-check valve A, 6-flow sensor, 7-second relief valve, 8-throttle valve, 9-filter A, 10-heat dissipation device, 11-first pressure sensor, 12-solenoid valve A, 13-check valve B, 14-oil pump, 15-first relief valve, 16-filter B, 17-ball valve, 18-oil inlet hose, 19-oil return socket, 20-solenoid valve B, 21-oil tank, 23-check valve C, 24-reversing valve, 25-pressure reducing valve, 26-air filter device, 27-inflating connector. DETAILED DESCRIPTION

[0074] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0075] It should be noted that the structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in the specification for understanding and reading by those familiar with this technology, and are not used to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", and "right" quoted in this specification are only for the convenience of description and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be considered as the scope of the implementation of the present invention without substantially changing the technical content.

[0076] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "provided with" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention.

[0077] It should be noted that the term "comprise" or any other variation is intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0078] like Figures 1 to 12 As shown, the present invention provides an oil sealing method for an aircraft engine. The oil sealing method uses a ground-based dynamic oil sealing device to seal the engine to be oil-sealed, and includes the following steps:

[0079] S1. Dehydrating the oil seal oil after heating;

[0080] S2. Cooling the oil seal oil;

[0081] S3. Oil seal the oil-sealed engine.

[0082] Specific combination Figure 1 、 Figures 9 to 12 As shown, the ground power oil seal equipment includes a vehicle body assembly and a hydraulic control system installed in the vehicle body assembly, the vehicle body assembly includes a vehicle frame, two fixed wheels and two universal wheels installed at the bottom of the vehicle frame, and a normally open door and a maintenance door arranged on the side of the vehicle frame, and a traction rod is also installed at the front end of the vehicle frame; the hydraulic control system includes a fuel tank 21, an oil pump 14, a quick-change connector 1, an oil filling hose 2, an oil inlet hose 18, an air charging connector 27 and a control valve, the control valve includes a solenoid valve, a one-way valve and a throttle valve 8; and a heating device for heating and dehydrating the oil seal oil is provided in the oil tank 21, and a control valve is provided at the bottom of the oil tank 21, the control valve is an oil drain ball valve 22, and the oil drain ball valve 22 is used to drain the residual oil seal oil in the oil tank 21;

[0083] The outlet end of the oil tank 21 is provided with a main line, and the inlet end of the oil tank 21 is provided with an oil return socket 19. In the main line, a solenoid valve A12, a solenoid valve B20, a throttle valve 8 and a one-way valve A5 are connected in series in sequence along the delivery direction of the oil seal oil. The oil pump 14 is installed on the main line between the solenoid valve A12 and the solenoid valve B20. The quick-change connector 1 is installed on the output end of the oil filling hose 2. The input end of the oil filling hose 2 is connected to the main line at the output end of the one-way valve A5. The quick-change connector 1 is detachably connected to the engine to be oil-sealed or the oil return socket 19. The quick-change connector 1 is used to achieve oil sealing of the engine to be oil-sealed or to achieve self-circulating filtration and cleaning of the oil seal oil in the oil tank 21.

[0084] The hydraulic control system further includes an oil inlet pipeline, a cooling pipeline and a nitrogen filling and oil removal pipeline communicating with the main pipeline, wherein:

[0085] The input end of the oil inlet pipeline is connected to the main pipeline between the solenoid valve A12 and the throttle valve 8, and the output end is connected to the solenoid valve B20. The oil inlet hose 18 is connected to the oil inlet pipeline through the oil pump 14. The oil source for the oil seal is connected to the oil inlet hose 18 to inject oil seal oil into the oil tank 21 to achieve oil seal oil filling.

[0086] The input end of the cooling pipeline is connected to the solenoid valve A12, and the output end thereof is detachably connected to the oil return socket 19. A heat sink 10 is installed in the cooling pipeline, and a one-way valve B13 is connected in series in the cooling pipeline at the front end of the heat sink 10. The heat sink 10 is used to cool the oil seal in the oil tank 21 to achieve cooling.

[0087] The output end of the nitrogen-filled oil-removing pipeline is connected to the main pipeline of the output end of the one-way valve A5. The charging connector 27 is installed at the input end of the nitrogen-filled oil-removing pipeline, and a one-way valve C23 is also installed in the nitrogen-filled oil-removing pipeline. The external nitrogen source is connected through the charging connector 27 to discharge the oil in the engine to be oil-sealed, thereby realizing nitrogen-filled oil-removing. Among them, the solenoid valve A12 and the solenoid valve B20 both adopt two-position three-way explosion-proof solenoid valves, and the two-position three-way explosion-proof solenoid valves include PA and PB output ends.

[0088] Furthermore, using the oil sealing method for an aircraft engine described in the present invention, an oil filter device is also installed in the main line, and the oil filter device includes a filter A9 and a filter B16. The filter A9 and the filter B16 are both stainless steel mesh filters, and their filter elements are stainless steel mesh with a filtration accuracy of 5μm. The filter A9 is installed in the main line between the solenoid valve A12 and the throttle valve 8, and the filter B16 is installed in the main line between the oil pump 14 and the solenoid valve B20.

[0089] The input end of the oil inlet pipeline is connected to the main pipeline between the filter A9 and the throttle valve 8, and the output end of the oil inlet hose 18 is connected to the main pipeline between the solenoid valve B20 and the filter B16. A control valve is also installed at the input end of the oil inlet hose 18. The control valve is a ball valve 17, and a refueling connector is configured in the ball valve 17. The oil inlet hose 18 is connected to an oil source for oil seals through the refueling connector. Under the action of the oil pump 14, oil seal oil is injected into the oil tank 21 through the oil inlet pipeline; wherein, the solenoid valve A12 and the solenoid valve B20 both adopt two-position three-way explosion-proof solenoid valves.

[0090] Furthermore, using the oil sealing method described herein, a control valve is installed in the main line. This control valve is a sampling valve 4, which is installed on the main line at the output end of the one-way valve A5. The nitrogen-filled oil removal pipeline is connected to the main line at the rear end of the sampling valve 4. The sampling valve 4 installed on the main line facilitates sampling and testing of the oil seal oil in the oil tank 21.

[0091] Furthermore, the oil sealing method described in the present invention is adopted, and an air filter device 26 and two control valves are connected in series in the nitrogen filling and oil removal pipeline along the gas flow direction. The two control valves are a pressure reducing valve 25 and a reversing valve 24. The pressure reducing valve 25 and the reversing valve 24 are installed in the nitrogen filling and oil removal pipeline in sequence along the gas flow direction. An external nitrogen source is connected through the inflation connector 27. The nitrogen in the nitrogen source passes through the air filter device 26, the pressure reducing valve 25, the reversing valve 24 and the one-way valve C23 in sequence, and is finally connected to the engine to be oil-sealed through the quick-change connector 1. The nitrogen transported by the nitrogen filling and oil removal pipeline is used to discharge the oil in the engine to be oil-sealed, thereby realizing nitrogen filling and oil removal of the engine to be oil-sealed; wherein, the air filter device 26 adopts a gas filter, and the reversing valve 24 adopts a two-position two-way electromagnetic reversing valve. Through the reserved inflation connector 27, an air filter device 26 is provided at the front end of the air connection. The air filter device 26 is used to filter out possible solid particulate impurities. The pressure in the nitrogen filling and oil removal pipeline mainly comes from the external air pump or gas cylinder. In order to meet the engine nitrogen filling and oil removal pressure requirements (0.85MPa~0.95MPa), a pressure reducing valve 25 and a reversing valve 24 are also installed in the nitrogen filling and oil removal pipeline. This can meet the need for pressure regulation. When the pressure meets the requirements, nitrogen is injected into the engine through the quick-change connector 1, and the nitrogen filling and oil removal work can be completed in 10 to 15 seconds; therefore, the time can be controlled within this range.

[0092] Furthermore, the oil sealing method described in the present invention is adopted, and the heating device is a heating tube, which is composed of three groups of annular heating tubes connected in parallel. The three groups of heating tubes are arranged in parallel in the middle and lower part of the inner wall of the oil tank 21. The three groups of annular heating tubes composed of parallel connections can be heated together or individually, so that a heating source can be effectively and evenly provided for the oil; the heat dissipation device 10 is a radiator, which includes heat dissipation fins and a convection fan located on one side of the heat dissipation fins. The radiator is installed in a cooling pipeline connected to the solenoid valve A12, and a cooling pipe joint is provided in the cooling pipeline at the output end of the one-way valve B13. The cooling pipeline is detachably connected to the return oil socket 19 through the cooling pipe joint, and the radiator is used to cool the oil seal oil in the oil tank 21.

[0093] Further, the oil sealing method has the hydraulic control system further comprising a pressure relief pipeline communicated with the main pipeline, the pressure relief pipeline comprising a first pressure relief pipeline and a second pressure relief pipeline, an inlet end of the first pressure relief pipeline being connected to the main pipeline at the outlet end of the oil pump 14, and an inlet end of the second pressure relief pipeline being connected to the main pipeline at the output end of the throttle valve 8, and a pressure relief pipe joint being arranged at an outlet end of each of the first pressure relief pipeline and the second pressure relief pipeline, and the first pressure relief pipeline and the second pressure relief pipeline being detachably connected with the oil return socket 19 through the corresponding pressure relief pipe joint; and one control valve being arranged in each of the first pressure relief pipeline and the second pressure relief pipeline, the control valve being a relief valve, the relief valve comprising a first relief valve 15 and a second relief valve 7, the first relief valve 15 being arranged in the first pressure relief pipeline, and the second relief valve 7 being arranged in the second pressure relief pipeline. When the pressure on the main pipeline exceeds the preset value during the oil sealing of the engine, the oil sealing oil is returned to the oil tank 21 through the relief valve for pressure relief, and the oil sealing oil will not be leaked.

[0094] Specifically combined Figures 2 to 8 As shown, the oil sealing method has the ground power oil sealing equipment further comprising an electrical control system arranged in the vehicle body assembly, the electrical control system comprising a power supply system, a control system, a collection system and an operation panel, the power supply system being electrically connected with the control system, the collection system and the operation panel, and used for providing working power for the control system, the collection system and the operation panel; wherein,

[0095] The collection system comprises an integrator and a sensor, the sensor comprising a pressure sensor, a temperature sensor, a liquid level sensor and a flow sensor 6, the pressure sensor, the temperature sensor, the liquid level sensor and the flow sensor 6 being electrically connected with the integrator, the pressure sensor comprising a first pressure sensor 11 arranged in the main pipeline at the outlet position of the electromagnetic valve A12, and a second pressure sensor 3 arranged in the main pipeline at the outlet position of the one-way valve A5; the temperature sensor and the liquid level sensor being arranged in the oil tank 21; and the flow sensor 6 being arranged in the main pipeline between the one-way valve A5 and the throttle valve 8;

[0096] The collection system detects the oil sealing oil state and the oil sealing state in real time through the pressure sensor, the temperature sensor, the liquid level sensor and the flow sensor 6, and feeds back to the control system, and the control system controls the oil pump 14, the heating device, the heat dissipation device 10 and the control valve through the feedback value of the collection system;

[0097] The control system includes a manual control system, a programmable PLC control system and a switching module. The manual control system and the programmable PLC control system can be switched to manual or automatic mode through the switching module. The control system is respectively connected to the oil pump 14, the heating device, the heat dissipation device 10 and the control valve;

[0098] The operation panel includes a human-machine interactive touch interface, an operation switch, an integrator display, an indicator light, and an audible and visual alarm. The operation switch includes a power switch, an emergency stop button, and a toggle switch. The integrator display is electrically connected to the pressure sensor, temperature sensor, liquid level sensor, and flow sensor 6 in the acquisition system. The control system is electrically connected to the operation panel. The human-machine interactive touch interface in the operation panel is used to display the feedback value of the acquisition system and perform human-machine interactive operations. The audible and visual alarm emits an audible and visual alarm prompt based on the feedback value of the acquisition system. Among them, the human-machine interactive touch interface is used as a human-machine interactive touch interface to display the feedback value of the acquisition system and perform human-machine interactive operations. The audible and visual alarm can be set next to the human-machine interactive touch interface. The human-machine interactive touch interface is located on the top side of the vehicle frame so that the operator can simultaneously monitor the equipment parameters and engine status, thereby improving the efficiency and safety of the oil seal.

[0099] Using the oil sealing method of the present invention, in a specific application process, such as Figure 2 and Figure 3 As shown, since the power supply system provides power support and protection for the entire power system oil seal equipment, this power supply system adopts three-phase three-wire 380V / 50HZ AC power supply, and the switching power supply converts AC380V into DC24V control power supply. The power supply system has functions such as phase loss protection, overload protection and automatic phase change protection. This can ensure the normal operation of the system, enable the smooth transmission of power, and the normal operation of the electrical system. At the same time, separate grounding protection is used in the circuit, and the electrical system is connected to the power connector to achieve shielded grounding and protective grounding for the electrical system to prevent interference generated by circuit operation from affecting the performance of the equipment and damaging the electrical system; the metal shell of the vehicle body is provided with a grounding column, and the grounding column is equipped with a grounding mark, which is connected to the grounding pile through an external grounding wire to achieve protective grounding to avoid the vehicle body being electrified due to circuit aging and electric shock accidents. As Figure 4 As shown in the figure, the acquisition system consists of an integrator and temperature sensors, pressure sensors, flow sensors, and flow sensors. The sensors transmit the relevant collected current signal input to the integrator, which then transmits the data to the programmable PLC controller to complete the data information acquisition.

[0100] In addition, if Figure 5As shown, the control system uses a programmable controller as its brain, responsible for electrical system control and calculation functions. The data acquisition system includes pressure sensors, temperature sensors, and flow sensors, responsible for collecting required system parameters such as temperature and pressure, and communicating these parameters to the control system. The operation panel can display various system information in real time, including control mode and operating status.

[0101] The control system is powered by DC24V and uses a programmable controller as the central processing unit to control peripheral I / O modules and communicate with instruments to achieve the following functions:

[0102] Power-on self-test: The device has the function of automatically detecting faults.

[0103] Automatic / Manual: Switchable between manual and automatic modes. Automatic: In automatic mode, the device can realize the "one-button oil seal" function. Manual: In manual mode, the device can realize the oil tank heating, oil filtration circulation, oil heating and water removal, oil heat dissipation, oil sealing and nitrogen filling and oil removal functions.

[0104] Data acquisition function: including temperature, pressure, flow data, etc. The data is displayed digitally, which is clear and easy to read.

[0105] Sound and light alarm function: alarm or fault prompt when the equipment temperature, oil pressure, or solenoid valve is working abnormally.

[0106] Emergency stop function: Under any circumstances, the power supply of the equipment will be cut off immediately and the equipment will stop working to prevent damage to the equipment or injury to personnel.

[0107] Since the control system has the function of automatically detecting whether the equipment circuits and components are faulty when it is turned on, when a fault is detected by self-detection, it can point out the fault point and provide troubleshooting tips.

[0108] The device realizes I / O port and line self-test by collecting I / O signals, and determines whether the data format is correct by communicating with the acquisition instrument through MODBUS to realize system self-test data collection.

[0109] During operation, the control system features two control modes: automatic and manual. This mode can be switched via the touchscreen or the manual / auto switch. When the manual / auto switch is moved to manual or the touchscreen is switched to manual mode, the device switches to manual mode, and the touchscreen status bar displays the manual mode. In this mode, the panel and touchscreen oil seal switches, heating switches, and other switches are enabled. The enabling switches activate corresponding actuators, such as relays and contactors, to enable oil tank heating, oil filtration and circulation, oil heating and water removal, oil cooling, oil sealing, and nitrogen filling and degreasing.

[0110] like Figure 6As shown, the automatic control mode can be adopted to realize the one-key oil sealing operation of the equipment. The specific operation method is:

[0111] In the process S1, the specific method of heating and then dehydrating the oil seal oil is as follows:

[0112] Connect the oil source to the refueling connector, inject the oil seal oil into the oil tank 21, and power on the entire ground power oil seal equipment. Press the operation switch on the operation panel and, under the control of the control system, take manual or automatic mode to perform the dehydration operation.

[0113] The oil level sensor in the oil tank 21 is used to monitor the oil level information, and the level value is fed back to the control system and displayed in the human-computer interactive touch interface of the operation panel;

[0114] If the oil in the oil tank 21 is insufficient and the liquid level is low, the sound and light alarm is controlled to issue an alarm, and the heating device is not started;

[0115] If the oil in the oil tank 21 is sufficient and the water content of the oil does not meet the oil seal requirements, that is, the water content of the oil is greater than 300ppm, the heating device is started to heat the oil seal oil in the oil tank 21; the oil temperature in the oil tank 21 is monitored by a temperature sensor, and the monitoring value is fed back to the control system; when the oil temperature reaches the set value of 105℃, the heating device is turned off, heating is stopped, and the high temperature is used to evaporate the water in the oil to ensure that the water content of the oil meets the oil seal requirements; at the same time, the indicator light flashes green to indicate that the oil is qualified, and the human-computer interactive touch interface prompts that the dehydration is completed; when the oil temperature exceeds 120℃, the indicator light flashes red, and an over-temperature alarm is issued through the sound and light alarm, and the temperature information is displayed on the human-computer interactive touch interface, and the heating device is disconnected at the same time;

[0116] If the water content of the oil meets the oil seal requirements, that is, the water content of the oil is not greater than 300ppm, the heating device is started to heat the oil seal oil in the oil tank 21 to heat the oil to 40℃~80℃;

[0117] In the process S2, the specific method for cooling the oil seal oil is:

[0118] Press the operation switch on the operation panel and, under the control of the control system, adopt manual or automatic mode to perform cooling operation;

[0119] The control system controls the solenoid valve A20 and the solenoid valve B12 to be in an open state; uses the liquid level sensor in the oil tank 21 to monitor the oil level information; and uses the temperature sensor to monitor the oil temperature information in the oil tank, and feeds the monitoring value back to the control system and displays it on the human-computer interactive touch interface;

[0120] If the oil level in the oil tank 21 is low, the indicator light flashes yellow to indicate the low level, and the oil temperature and level information are displayed on the human-machine interactive touch interface. The oil pump 14 and the heat dissipation device 10 are not started;

[0121] If the oil level is sufficient and the oil temperature is ≤80°C, the indicator light flashes yellow to indicate that the oil temperature is low; the oil temperature is displayed on the human-machine interactive touch interface, and the oil pump 14 and the heat dissipation device 10 are not started;

[0122] If the oil volume is sufficient and the oil temperature is greater than 80°C, the oil pump 14, the heat sink 10 and the one-way valve B13 are started, so that the oil in the oil tank 21 passes through the PB end of the solenoid valve A20, the filter B16, the oil pump 14, the PB end of the solenoid valve B12 and the heat sink 10 in sequence, and finally returns to the oil tank 21 through the one-way valve B13, realizing continuous circulation cooling. When the oil temperature in the oil tank 21 is 40°C ≤ oil temperature ≤ 80°C, the oil pump 14 and the heat sink 10 are turned off, the indicator light flashes green to indicate that the cooling is completed, and the cooling completion is displayed on the human-computer interactive touch interface.

[0123] In the process S3, the specific method of oil sealing the oil-sealed engine is as follows:

[0124] Press the operation switch on the operation panel and, under the control of the control system, operate the oil seal in manual or automatic mode;

[0125] The control system controls the solenoid valve A20 and the solenoid valve B12 to be in an open state;

[0126] The oil level information is monitored using the liquid level sensor in the oil tank 21; the oil temperature in the oil tank 21 is monitored using the temperature sensor, and the oil pressure in the main line is monitored using the first pressure sensor 11 and the second pressure sensor 3. The monitored values ​​are fed back to the control system and displayed on the human-computer interactive touch interface.

[0127] If the oil level in the oil tank 21 is low, the indicator light flashes yellow to indicate the low oil level; and the oil level information is displayed on the human-computer interactive touch interface, and the oil pump 14 does not start;

[0128] When the oil volume is sufficient and the oil temperature is less than 40°C or the oil temperature is greater than 80°C, the indicator light flashes yellow to indicate abnormal oil temperature, and the oil temperature is displayed on the human-machine interactive touch interface, and the oil pump 14 does not start;

[0129] When the oil volume is sufficient and the oil temperature is between 40℃≤oil temperature≤80℃, insert the quick-release connector 1 into the engine oil filling port, start the oil pump 14, throttle valve 8 and one-way valve A5, and allow the oil in the fuel tank 21 to pass through the PA end of the solenoid valve A20, the filter B16, the oil pump 14, the PB end of the solenoid valve B12, the filter A9 and the throttle valve 8 in sequence, and then enter the oil filling hose 2 through the one-way valve A5, and finally be injected into the engine through the quick-release connector 1 to complete the oil sealing operation.

[0130] Furthermore, using the oil sealing method of the present invention, in the process S1, the specific method of injecting the oil sealing oil into the oil tank 21 is:

[0131] Press the operating switch on the operation panel and, under the control of the control system, perform refueling in manual or automatic mode;

[0132] The control system controls the solenoid valve A20 and the solenoid valve B12 to be in an open state;

[0133] First, connect the oil barrel to the refueling connector, start the oil pump 14 and ball valve 17, and allow the oil in the oil barrel to pass through the ball valve 17, oil inlet hose 18, filter B16, oil pump 14, PA end of solenoid valve B12 and filter A9 in sequence, and finally be injected into the oil tank 21 through the oil inlet pipeline and PA end of solenoid valve A20 until the injected oil reaches the liquid level requirement, thereby completing the refueling operation of the oil tank 21.

[0134] Furthermore, in the oil sealing method of the present invention, in the process S1, before the oil sealing oil is heated and dehydrated, if the oil quality of the oil sealing oil in the oil tank 21 does not meet the oil sealing requirements, the oil sealing oil needs to be filtered and cleaned. The specific method of the filtering and cleaning process is as follows:

[0135] Press the operation switch on the operation panel and, under the control of the control system, perform the filter cleaning operation in manual or automatic mode;

[0136] The control system controls the solenoid valve A20 and the solenoid valve B12 to be in an open state;

[0137] First, insert the quick-release connector 1 into the oil return socket 19, start the oil pump 14, throttle valve 8 and check valve A5, so that the oil in the oil tank 21 passes through the PB end of the solenoid valve A20, the filter B16, the oil pump 14, the PA end of the solenoid valve B12, the filter A9, the throttle valve 8 and the check valve A5 in sequence, and finally flows back to the oil tank 21 through the oil filling hose 2. Through continuous circulation and filtration, until the oil quality of the oil seal oil meets the oil seal requirements, the filter B16 and filter A9 in the main line are used to achieve self-circulating filtration and cleaning of the oil seal oil in the oil tank 21;

[0138] In the specific application process, the oil seal oil adopts the oil meeting the GJB420B-7 level, in order to ensure that the oil liquid pollution degree of the oil at the outlet of the quick release joint 1 is better than the GJB420B-7 level, the oil needs to be filtered, at the same time, in order to guarantee that the equipment better meets various indexes without increasing redundant structure design, the oil return port 19 is specially designed, so that the oil tank 21, the oil pump 14, the oil filter device and the oil injection hose 2 form a closed loop structure, the oil liquid in the oil tank 21 is continuously filtered, and then the oil liquid pollution degree better than the GJB420B-7 level is effectively guaranteed. At the same time, an oil liquid sampling port is arranged on the main pipeline, and a sampling valve 4 is arranged at the sampling port, the sampling valve 4 adopts the form of a knob ball valve, so that personnel operation and rapid sampling can be facilitated, and the oil liquid in the oil tank can also be effectively prevented from being polluted by the outside.

[0139] In addition, by adopting the oil sealing method, in the process S3, before the engine to be sealed is sealed, if the original oil seal oil in the engine to be sealed does not meet the requirements, the original oil seal oil in the engine to be sealed needs to be discharged, so as to avoid that the injected oil seal oil is mixed with the original oil seal oil, thereby affecting the engine, and the oil liquid in the engine to be sealed is discharged by adopting a nitrogen charging and oil removing mode, and the specific method of the nitrogen charging and oil removing is as follows:

[0140] The operation switch in the operation panel is pressed, and the nitrogen charging and oil removing operation is performed in the manual or automatic mode under the action of the control system;

[0141] The control system controls the one-way valve C23, the reversing valve 24 and the pressure reducing valve 25 to be in the open state;

[0142] Firstly, the quick release joint 1 is inserted into the engine to be sealed, then the nitrogen source is connected to the gas charging joint 27, and finally the external nitrogen source is started, so that the nitrogen in the nitrogen source sequentially passes through the gas filter device 26, the pressure reducing valve 25, the reversing valve 24 and the one-way valve C23 in the gas injection pipeline, and finally passes through the quick release joint 1 in the oil injection hose 2 to be injected into the engine, so as to discharge the oil liquid in the engine to be sealed and realize the nitrogen charging and oil removing.

[0143] By adopting the oil sealing method described in the present invention, the hydraulic control system and the electrical control system can be installed in the vehicle body assembly through the configured ground power oil sealing equipment, thereby realizing the automation of the entire oil sealing process. The entire system is highly integrated and has a multi-functional synchronous design. The acquisition system and the control system realize real-time measurement and intelligent control of pressure and temperature, and display the measured temperature, pressure and flow. In addition, when recording and collecting the operating process data of the oil sealing device, if an abnormality is found, an alarm prompt can be given in time through the indicator light and the sound and light alarm, which greatly improves safety. At the same time, it can also be operated in manual or automatic mode. In the automatic mode, one-button oil sealing operation can be achieved, which greatly improves the efficiency of ground oil sealing of aircraft engines.

[0144] In addition, the oil sealing method described in the present invention is used, and various control valves installed in the main pipeline, various sensors used in the collection system, as well as heating devices, heat dissipation devices, and pipe joints and other equipment are all commonly used equipment in the existing technology and can be directly purchased on the existing market without involving any changes to their structures. Their application in the present invention is aimed at achieving convenient control, and therefore there are no requirements for their specific models or specifications, as long as they match each other and meet the use requirements.

[0145] In summary, the oil sealing method described in the present invention can meet the ground oil sealing needs of aircraft engines by configuring the vehicle body components, and through the hydraulic control system and electrical control system installed in the vehicle body components, not only can the oil seal oil self-circulation filtration and cleaning, heating and dehydration, cooling and oil sealing requirements be met, but also the nitrogen filling and oil removal requirements can be achieved, which greatly improves the convenience and maintenance efficiency of maintenance personnel, reduces work intensity and oil sealing costs, and is suitable for promotion and application.

[0146] Other aspects of the present invention that are not described in detail are all conventional techniques known to those skilled in the art.

[0147] The protection scope of the present invention is not limited to the technical solutions disclosed in the specific implementation methods. The above description is only a preferred implementation method of the present invention and does not limit the present invention. Any minor modifications, equivalent replacements and improvements made based on the technical solutions of the present invention should be included in the protection scope of the technical solutions of the present invention.

Claims

1. An oil sealing method for an aircraft engine, characterized in that: The oil sealing method uses ground-based dynamic oil sealing equipment to seal the engine to be oil-sealed, and includes the following steps: S1. Dehydrating the oil seal oil after heating; S2. Cooling the oil seal oil; S3. Treat the oil-sealed engine as oil-sealed; The ground power oil seal device comprises a vehicle body assembly and a hydraulic control system installed in the vehicle body assembly, wherein the hydraulic control system comprises an oil tank (21), an oil pump (14), a quick-change joint (1), an oil injection hose (2), an oil inlet hose (18), an air charging joint (27) and a control valve, wherein the control valve comprises a solenoid valve, a one-way valve and a throttle valve (8); and a heating device for heating and dehydrating the oil seal oil is provided in the oil tank (21); The outlet end of the oil tank (21) is provided with a main pipeline, and the inlet end of the oil tank (21) is provided with an oil return socket (19), and in the main pipeline, a solenoid valve A (12), a solenoid valve B (20), a throttle valve (8) and a one-way valve A (5) are sequentially connected in series along the conveying direction of the oil seal oil. The oil pump (14) is installed on the main pipeline between the solenoid valve A (12) and the solenoid valve B (20). The quick-change joint (1) is installed on the output end of the oil injection hose (2), and the input end of the oil injection hose (2) is connected to the main pipeline of the output end of the one-way valve A (5). The quick-change joint (1) is detachably connected to the engine to be oil-sealed or the oil return socket (19). The quick-change joint (1) is used to realize oil sealing of the engine to be oil-sealed, or to realize self-circulation filtration and cleaning of the oil seal oil in the oil tank (21); The hydraulic control system further includes an oil inlet pipeline, a cooling pipeline and a nitrogen filling and oil removal pipeline communicating with the main pipeline, wherein: The input end of the oil inlet pipeline is connected to the main pipeline between the solenoid valve A (12) and the throttle valve (8), and the output end is connected to the solenoid valve B (20). The oil inlet hose (18) is connected to the oil inlet pipeline through the oil pump (14). The oil source for oil seal is connected to the oil inlet hose (18) to inject oil seal oil into the oil tank (21) to achieve oil seal oil filling. The input end of the cooling pipeline is connected to the electromagnetic valve A (12), and the output end thereof is detachably connected to the oil return socket (19). A heat dissipation device (10) is installed in the cooling pipeline, and a one-way valve B (13) is connected in series in the cooling pipeline at the front end of the heat dissipation device (10). The heat dissipation device (10) is used to cool the oil seal in the oil tank (21) to achieve temperature reduction and cooling. The output end of the nitrogen-filled oil-removing pipeline is connected to the main pipeline of the output end of the one-way valve A (5), the gas charging connector (27) is installed at the input end of the nitrogen-filled oil-removing pipeline, and a one-way valve C (23) is also installed in the nitrogen-filled oil-removing pipeline. An external nitrogen source is connected through the gas charging connector (27) to discharge the oil in the engine to be oil-sealed, thereby achieving nitrogen-filled oil-removing.

2. The oil sealing method for an aircraft engine according to claim 1, characterized in that: An oil filter device is also installed in the main pipeline, and the oil filter device includes a filter A (9) and a filter B (16). The filter A (9) and the filter B (16) are both stainless steel mesh filters, and their filter elements are stainless steel mesh with a filtration accuracy of 5 μm. The filter A (9) is installed on the main pipeline between the solenoid valve A (12) and the throttle valve (8), and the filter B (16) is installed on the main pipeline between the oil pump (14) and the solenoid valve B (20). The input end of the oil inlet pipeline is connected to the main pipeline between the filter A (9) and the throttle valve (8), and the output end of the oil inlet hose (18) is connected to the main pipeline between the solenoid valve B (20) and the filter B (16). A control valve is also installed at the input end of the oil inlet hose (18), and the control valve is a ball valve (17). A refueling connector is configured in the ball valve (17). The oil inlet hose (18) is connected to an oil source for oil seals through the refueling connector. Under the action of the oil pump (14), oil seal oil is injected into the oil tank (21) through the oil inlet pipeline. The solenoid valve A (12) and the solenoid valve B (20) are both two-position three-way explosion-proof solenoid valves.

3. The oil sealing method for an aircraft engine according to claim 2, characterized in that: A control valve is also installed in the main line. The control valve is a sampling valve (4). The sampling valve (4) is installed on the main line at the output end of the one-way valve A (5); the nitrogen filling and oil removal pipeline is connected to the main line at the rear end of the sampling valve (4).

4. The oil sealing method for an aircraft engine according to claim 3, characterized in that: An air filter device (26) and two control valves are sequentially connected in series along the gas flow direction in the nitrogen filling and oil removal pipeline. The two control valves respectively include a pressure reducing valve (25) and a reversing valve (24). The pressure reducing valve (25) and the reversing valve (24) are sequentially installed in the nitrogen filling and oil removal pipeline along the gas flow direction. A nitrogen source is externally connected through the air filling joint (27). Nitrogen in the nitrogen source sequentially passes through the air filter device (26), the pressure reducing valve (25), the reversing valve (24) and the one-way valve C (23), and is finally connected to the engine to be oil-sealed through a quick-change joint (1). The nitrogen transported by the nitrogen filling and oil removal pipeline is used to discharge the oil in the engine to be oil-sealed, thereby achieving nitrogen filling and oil removal of the engine to be oil-sealed. The air filter device (26) adopts a gas filter, and the reversing valve (24) adopts a two-position two-way electromagnetic reversing valve.

5. The oil sealing method for an aircraft engine according to claim 1, characterized in that: The heating device is a heating pipe, which is composed of three groups of annular heating pipes connected in parallel. The three groups of heating pipes are arranged in parallel at the middle and lower part of the inner wall of the oil tank (21); the heat dissipation device (10) is a radiator, which includes heat dissipation fins and a convection fan located on one side of the heat dissipation fins. The radiator is installed in a cooling pipeline connected to the solenoid valve A (12), and a cooling pipe joint is provided in the cooling pipeline at the output end of the one-way valve B (13). The cooling pipeline is detachably connected to the return oil socket (19) through the cooling pipe joint. The radiator is used to cool the oil seal oil in the oil tank (21).

6. The oil sealing method for an aircraft engine according to claim 1, characterized in that: The hydraulic control system further comprises a pressure relief line connected to the main line, the pressure relief line comprising a first pressure relief line and a second pressure relief line, the inlet end of the first pressure relief line being connected to the main line at the outlet end of the oil pump (14), and the inlet end of the second pressure relief line being connected to the main line at the output end of the throttle valve (8), and pressure relief pipe joints being provided at the outlet ends of the first pressure relief line and the second pressure relief line, the first pressure relief line and the second pressure relief line being detachably connected to the return oil socket (19) through corresponding pressure relief pipe joints; a control valve is respectively installed in the first pressure relief line and the second pressure relief line, the control valve being a relief valve, and the relief valve comprising a first relief valve (15) and a second relief valve (7); wherein the first relief valve (15) is installed in the first pressure relief line, and the second relief valve (7) is installed in the second pressure relief line.

7. The oil sealing method for an aircraft engine according to claim 1, characterized in that: The vehicle body assembly includes a vehicle frame, two fixed wheels and two universal wheels installed at the bottom of the vehicle frame, and a normally open door and a maintenance door arranged on the side of the vehicle frame, and a traction rod is also installed at the front end of the vehicle frame; the hydraulic control system is installed in the vehicle frame, and a control valve is provided at the bottom of the oil tank (21), and the control valve is an oil drain ball valve (22), which is used to drain the residual oil seal oil in the oil tank (21) through the oil drain ball valve (22).

8. The oil sealing method for an aircraft engine according to any one of claims 1 to 7, characterized in that: The ground power oil seal device also includes an electrical control system installed in the vehicle body assembly, the electrical control system includes a power supply system, a control system, a collection system and an operation panel, the power supply system is electrically connected to the control system, the collection system and the operation panel respectively, and is used to provide working power to the control system, the collection system and the operation panel; wherein, The acquisition system includes an integrator and sensors, wherein the sensors include a pressure sensor, a temperature sensor, a liquid level sensor, and a flow sensor (6), wherein the pressure sensor, the temperature sensor, the liquid level sensor, and the flow sensor (6) are electrically connected to the integrator respectively, wherein the pressure sensor includes a first pressure sensor (11) arranged in a main pipe at an outlet position of a solenoid valve A (12), and a second pressure sensor (3) arranged in a main pipe at an outlet position of a one-way valve A (5); the temperature sensor and the liquid level sensor are respectively installed in an oil tank (21); and the flow sensor (6) is installed in the main pipe between the one-way valve A (5) and the throttle valve (8); The acquisition system detects the oil seal status and the oil seal status in real time through a pressure sensor, a temperature sensor, a liquid level sensor and a flow sensor (6), and feeds back to the control system through an integrator. The control system controls the oil pump (14), the heating device, the heat dissipation device (10) and the control valve based on the feedback value of the acquisition system; The control system includes a manual control system, a programmable PLC control system and a switching module. The manual control system and the programmable PLC control system can be switched to a manual or automatic mode via the switching module. The control system is respectively connected to the oil pump (14), the heating device, the heat dissipation device (10) and the control valve; The operation panel includes a human-computer interaction touch interface, an operation switch, an integrator display screen, an indicator light and an audible and visual alarm. The operation switch includes a power switch, an emergency stop button and a toggle switch. The integrator display screen is electrically connected to the integrator in the acquisition system. The control system is electrically connected to the operation panel. The human-computer interaction touch interface in the operation panel is used to display the feedback value of the acquisition system and perform human-computer interaction operations. The audible and visual alarm emits an audible and visual alarm prompt based on the feedback value of the acquisition system.

9. The oil sealing method for an aircraft engine according to claim 8, characterized in that: In the process S1, the specific method of heating and then dehydrating the oil seal oil is as follows: Connect an external oil source through the refueling joint, inject oil seal oil into the oil tank (21), and power on the entire ground power oil seal equipment. Press the operation switch in the operation panel and, under the control of the control system, adopt manual or automatic mode to perform dehydration operation; The liquid level sensor in the oil tank (21) is used to monitor the oil level information, and the liquid level value is fed back to the control system and displayed in the human-machine interactive touch interface of the operation panel; If the amount of oil in the oil tank (21) is insufficient and the liquid level is low, the sound and light alarm is controlled to issue an alarm prompt, and the heating device is not started; If the amount of oil in the oil tank (21) is sufficient and the water content of the oil does not meet the oil seal requirements, that is, when the water content of the oil is greater than 300ppm, the heating device is started to heat the oil seal oil in the oil tank (21); the oil temperature in the oil tank (21) is monitored by a temperature sensor, and the monitored value is fed back to the control system; when the oil temperature reaches a set value of 105°C, the heating device is turned off, the heating is stopped, and the high temperature is used to evaporate the water in the oil to ensure that the water content of the oil meets the oil seal requirements; at the same time, the indicator light flashes green to indicate that the oil is qualified, and the human-computer interactive touch interface prompts that the dehydration is completed; when the oil temperature exceeds 120°C, the indicator light flashes red, and an over-temperature alarm is issued through the sound and light alarm, and the temperature information is displayed on the human-computer interactive touch interface, and the heating device is disconnected at the same time; If the water content of the oil meets the oil seal requirement, that is, the water content of the oil is not greater than 300 ppm, the heating device is started to heat the oil seal oil in the oil tank (21) to heat the oil to 40°C to 80°C; In the process S2, the specific method for cooling the oil seal oil is as follows: Press the operation switch on the operation panel and, under the control of the control system, adopt manual or automatic mode to perform cooling operation; The control system controls the electromagnetic valve A (12) and the electromagnetic valve B (20) to be in an open state; uses a liquid level sensor in the oil tank (21) to monitor oil level information; and uses a temperature sensor to monitor oil temperature information in the oil tank, and feeds the monitored value back to the control system and displays it on a human-computer interactive touch interface; If the oil level in the oil tank (21) is low, the indicator light flashes yellow to indicate the low level, and the oil temperature and level information are displayed on the human-machine interactive touch interface, and the oil pump (14) and the heat dissipation device (10) are not started; If the oil volume is sufficient and the oil temperature is ≤80°C, the indicator light flashes yellow to indicate that the oil temperature is low; the oil temperature is displayed on the human-machine interactive touch interface, and the oil pump (14) and the heat dissipation device (10) are not started; If the oil volume is sufficient and the oil temperature is greater than 80°C, the oil pump (14), the heat sink (10) and the one-way valve B (13) are started, so that the oil in the oil tank (21) passes through the solenoid valve A (12), the filter B (16), the oil pump (14), the solenoid valve B (20) and the heat sink (10) in sequence, and finally returns to the oil tank (21) through the one-way valve B (13), so as to achieve continuous circulation cooling and temperature reduction. When the oil temperature in the oil tank (21) is 40°C≤oil temperature≤80°C, the oil pump (14) and the heat sink (10) are turned off, the indicator light flashes green to indicate that the cooling is completed, and the cooling completion is displayed on the human-machine interactive touch interface; In the process S3, the specific method of oil sealing the oil-sealed engine is as follows: Press the operation switch on the operation panel and, under the control of the control system, operate the oil seal in manual or automatic mode; The control system controls the solenoid valve A (12) and the solenoid valve B (20) to be in an open state; The oil level information is monitored using a level sensor in the oil tank (21); the oil temperature in the oil tank (21) is monitored using a temperature sensor; and the oil pressure of the main line is monitored using a first pressure sensor (11) and a second pressure sensor (3), and the monitored values ​​are fed back to the control system; and at the same time, the values ​​are displayed on a human-computer interactive touch interface; If the oil level in the oil tank (21) is low, the indicator light flashes yellow to indicate the low oil level; and the oil level information is displayed on the human-machine interactive touch interface, and the oil pump (14) does not start; When the oil volume is sufficient and the oil temperature is less than 40°C or the oil temperature is greater than 80°C, the indicator light flashes yellow to indicate that the oil temperature is abnormal, and the oil temperature is displayed on the human-machine interactive touch interface, and the oil pump (14) does not start; When the oil volume is sufficient and the oil temperature is 40°C≤oil temperature≤80°C, the quick-release joint (1) is inserted into the engine oil filling port, and the oil pump (14), the throttle valve (8) and the one-way valve A (5) are started, so that the oil in the oil tank (21) passes through the solenoid valve A (12), the filter B (16), the oil pump (14), the solenoid valve B (20), the filter A (9) and the throttle valve (8) in sequence, and then enters the oil filling hose (2) through the one-way valve A (5), and finally is injected into the engine through the quick-release joint (1), completing the oil sealing operation.

10. The oil sealing method for an aircraft engine according to claim 9, characterized in that: In the process S1, the specific method of injecting the oil seal oil into the oil tank (21) is as follows: Press the operating switch on the operation panel and, under the control of the control system, perform refueling in manual or automatic mode; The control system controls the solenoid valve A (12) and the solenoid valve B (20) to be in an open state; First, connect the oil barrel to the refueling joint, start the oil pump (14) and the ball valve (17), and make the oil in the oil barrel pass through the ball valve (17), the oil inlet hose (18), the filter B (16), the oil pump (14), the solenoid valve B (20) and the filter A (9) in sequence, and finally be injected into the oil tank (21) through the oil inlet pipeline and the solenoid valve A (12) until the injected oil reaches the required liquid level, thereby completing the refueling operation of the oil tank (21); At the same time, in the process S1, before the oil seal oil is heated and dehydrated, if the oil quality of the oil seal oil in the oil tank (21) does not meet the oil seal requirements, the oil seal oil needs to be filtered and cleaned. The specific method of the filtering and cleaning process is as follows: Press the operation switch on the operation panel and, under the control of the control system, perform the filter cleaning operation in manual or automatic mode; The control system controls the solenoid valve A (12) and the solenoid valve B (20) to be in an open state; First, insert the quick-release connector (1) into the oil return socket (19), start the oil pump (14), the throttle valve (8) and the one-way valve A (5), so that the oil in the oil tank (21) passes through the solenoid valve A (12), the filter B (16), the oil pump (14), the solenoid valve B (20), the filter A (9), the throttle valve (8) and the one-way valve A (5) in sequence, and finally flows back to the oil tank (21) through the oil filling hose (2). Through continuous circulation and filtration, until the oil quality of the oil seal oil meets the oil seal requirements, the filter B (16) and the filter A (9) in the main line are used to realize the self-circulation filtration and cleaning of the oil seal oil in the oil tank (21); In addition, in the process S3, before oil sealing the engine to be oil-sealed, if the original oil sealing oil in the engine to be oil-sealed does not meet the requirements, it is necessary to discharge the original oil sealing oil in the engine to be oil-sealed to avoid mixing of the injected oil sealing oil with the original oil sealing oil, thereby affecting the engine. A nitrogen filling and oil removal method is adopted to discharge the oil in the engine to be oil-sealed. The specific method of nitrogen filling and oil removal is as follows: Press the operation switch on the operation panel and, under the control of the control system, adopt manual or automatic mode to perform nitrogen filling and oil removal operation; The control system controls the one-way valve C (23), the reversing valve (24) and the pressure reducing valve (25) to be in an open state; First, the quick-release joint (1) is inserted into the engine to be oil-sealed, and then an external nitrogen source is connected through the air charging joint (27). Finally, the external nitrogen source is started, and the nitrogen in the nitrogen source passes through the air filter device (26), the pressure reducing valve (25), the reversing valve (24) and the one-way valve C (23) in the air injection pipeline in sequence, and finally is injected into the engine through the quick-release joint (1) in the oil injection hose (2), so as to discharge the oil in the engine to be oil-sealed and realize nitrogen filling and oil removal.

Images