High-temperature lubricating oil system for aero-engine

Abstract

The utility model relates to a lubricating system of an aero-engine, in particular to a high-temperature lubricating oil system for the aero-engine. The system comprises an oil tank, a heating circulation device and a main oil way, the heating circulation device comprises a circulation pipeline, a first delivery pump and a heater, the oil inlet end and the oil outlet end of the circulation pipeline are connected with the oil tank, the first delivery pump is arranged on the circulation pipeline, the heater is communicated with the circulation pipeline, and the first delivery pump is arranged on the first delivery pump. The oil inlet end and the oil outlet end of the main oil way are connected with the oil tank, and the main oil way and the circulating pipeline are independently arranged relative to the oil tank. The temperature of the oil can be rapidly increased, it is guaranteed that the oil is evenly distributed, and therefore the lubricating effect is improved, and the working performance and reliability of the aero-engine are improved.

Description

Technical Field

[0001] The present application relates to the field of lubrication systems, and in particular to a high-temperature lubricating oil system for aircraft engines. Background Art

[0002] High-temperature lubricating oil systems are widely used in the aerospace industry, particularly in high-performance jet engines. This system is primarily responsible for lubricating the engine's moving parts, reducing friction and wear, and ensuring smooth engine operation. However, aircraft engines operate at extremely high temperatures, placing even stricter demands on lubricating oil systems.

[0003] Existing high-temperature lubricating oil systems generally include an oil pump, oil pipes, radiators, filters, and sensor detection systems. The oil pump is responsible for extracting the lubricating oil from the oil tank and transporting it to the parts that need lubrication; the oil pipes are used to transport the lubricating oil; the radiator is used to reduce the temperature of the lubricating oil to prevent it from deteriorating due to high temperature; the filter is used to remove impurities in the lubricating oil and keep the lubricating oil clean; the sensor monitoring system is used to feedback and adjust the temperature and pressure of the oil to ensure that the temperature and pressure status of the oil can meet the use requirements.

[0004] However, the oil supplied by the existing high-temperature lubricating oil system has defects in temperature and quality. The slow heating efficiency results in the temperature not meeting the operating requirements of the aircraft engine. The uneven temperature distribution of the oil leads to inconsistent viscosity, resulting in a decrease in lubrication effect. Utility Model Content

[0005] In order to improve the oil heating efficiency and lubrication effect of a warm lubricating oil system, the present application provides a high-temperature lubricating oil system for an aircraft engine.

[0006] The present application provides a high-temperature lubricating oil system for an aircraft engine, which adopts the following technical solution:

[0007] A high-temperature lubricating oil system for an aircraft engine includes an oil tank, a heating circulation device, and a main oil circuit. The heating circulation device includes a circulation pipeline, a first delivery pump, and a heater. The oil inlet and oil outlet of the circulation pipeline are respectively connected to the oil tank. The first delivery pump is arranged on the circulation pipeline. The heater is in communication with the circulation pipeline. The oil inlet and oil outlet of the main oil circuit are respectively connected to the oil tank. The main oil circuit and the circulation pipeline are respectively arranged independently relative to the oil tank.

[0008] By adopting the above technical solution, the independent heating circulation oil circuit ensures that the lubricating oil will not affect the normal lubrication process during the heating process. The oil in the oil tank is transported to the heater through the heating circulation oil circuit for preheating, which increases the initial temperature of the oil and enables it to quickly reach the operating temperature required by the aircraft engine. The oil exchange mechanism between the heating circulation oil circuit and the main oil circuit allows the lubricating oil to be evenly mixed during the heating process, thereby improving the lubrication effect.

[0009] Optionally, the oil inlet and oil outlet of the circulation pipeline are respectively connected to the bottom of the side wall of the oil tank facing the heater; the oil inlet and oil return ends of the main oil circuit are respectively connected to the bottom of the side wall of the oil tank facing away from the heater.

[0010] By adopting the above technical solution, good internal convection is formed, the oil is heated evenly, and the existence of local overheating or cold areas is avoided, thereby improving the overall heating efficiency and the consistency of the oil temperature.

[0011] Optionally, the oil outlet end of the circulation pipeline is connected to the top of the oil tank, and the oil inlet end of the circulation pipeline is connected to the bottom of the oil tank. A drive motor is installed on the top of the oil tank. A stirring shaft is provided at the central axis inside the oil tank body. One end of the stirring shaft is connected to the output end of the drive motor, and a stirring paddle is connected to the stirring shaft.

[0012] By adopting this technical solution, the oil forms vertical convection within the tank, effectively promoting uniform temperature distribution. Simultaneously, the drive motor mounted on the top of the tank drives the agitator shaft and agitator paddles to rotate, further enhancing the mixing effect of the oil and ensuring a more uniform temperature throughout the tank, avoiding local overheating or overcooling, and improving the overall performance of the lubricating oil system.

[0013] Optionally, the outer wall of the oil tank is further provided with a heat insulating shell.

[0014] By adopting the above technical solution, the heat-insulating shell can effectively reduce the impact of the external environment on the oil temperature in the oil tank, prevent heat loss, and maintain the stability of the oil temperature.

[0015] Optionally, the high-temperature lubricating oil system also includes an oil replenishing system, which is connected to the bottom of the side wall of the oil tank facing away from the heater. A liquid level relay and a magnetic flap level gauge are provided on the top of the oil tank body. The oil replenishing system is electrically connected to the liquid level relay and the magnetic flap level gauge.

[0016] By adopting this technical solution, we can effectively avoid the problem of insufficient oil in the tank and ensure the normal operation of the lubricating oil system. The level relay and magnetic flap level gauge monitor the oil level in the tank in real time. When the oil level falls below the preset value, the oil replenishment system automatically activates to replenish the oil in time, thus ensuring the stability of the system.

[0017] Optionally, the main oil circuit includes a main delivery pipeline, a second delivery pump is provided on the main delivery pipeline, and filters and detection systems are sequentially arranged along the delivery direction of the main delivery pipeline, the filter is used to filter impurities in the oil, and the detection system is used to detect the temperature and pressure of the delivered oil. The high-temperature lubricating oil system also includes an electronic control system, which is electrically connected to the detection system, the second delivery pump and the heater respectively.

[0018] By implementing this technical solution, we can achieve effective filtration and precise testing of the oil in the main oil circuit, ensuring that the oil quality and condition meet the stringent requirements of aircraft engines. Furthermore, the introduction of an electronic control system allows for real-time adjustment of the oil temperature and pressure, improving the system's response speed and stability, further enhancing lubrication effectiveness.

[0019] Optionally, the detection system includes a temperature sensor and a pressure sensor installed on the same valve block, the main delivery pipeline is connected to the valve block, the temperature sensor is electrically connected to the heater, and the pressure sensor is electrically connected to the second delivery pump.

[0020] This technical solution enables real-time monitoring of the oil temperature and pressure in the main delivery pipeline. The electrical connection between the temperature sensor and the heater automatically adjusts the heater's operating status to ensure the oil temperature meets the aircraft engine's requirements. Furthermore, the electrical connection between the pressure sensor and the secondary delivery pump dynamically adjusts the pump's speed to maintain the oil pressure within the ideal range, thereby improving system stability and reliability.

[0021] Optionally, a flow meter is further installed on the valve block, and the flow meter is electrically connected to the second delivery pump.

[0022] By adopting the above technical solution, the flow meter can monitor the oil flow in the main delivery pipeline in real time and feed the data back to the electronic control system, thereby achieving precise control of the second delivery pump, ensuring stable oil flow, and improving the system's operating reliability and lubrication effect.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. The setting of the heating circulation device can significantly improve the heating rate of the lubricating oil, effectively solving the problem of slow heating efficiency of the existing system. The design of the circulation pipeline and the mixer enables the lubricating oil to be fully mixed before entering the main oil circuit, ensuring uniform temperature distribution of the lubricating oil, avoiding inconsistent oil viscosity, and improving the overall lubrication effect.

[0025] 2. The electronic control system ensures that the temperature and pressure of the lubricating oil are always maintained at the optimal state through feedback adjustment of the temperature sensor and pressure sensor, further improving the reliability and stability of the system.

[0026] 3. The integrated design of the main conveying pipeline and the detection system simplifies the system structure, improves the system integration and maintenance convenience, and reduces the failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1It is a schematic diagram of the oil circuit of the lubricating oil system of the embodiment of the present application.

[0028] Figure 2 It is a schematic diagram of the overall structure of the lubricating oil system of an embodiment of the present application.

[0029] Figure 3 It is a structural schematic diagram of the oil tank without the shell in the embodiment of the present application.

[0030] Figure 4 It is a structural cross-sectional view of the oil tank stirring system of Example 2 of the present application.

[0031] Explanation of the accompanying symbols: 1. Oil tank; 11. Liquid level relay; 12. Magnetic flap liquid level gauge; 13. Insulated shell; 2. Heating circulation device; 21. Circulation pipeline; 22. Heater; 23. First delivery pump; 3. Main oil circuit; 31. Main delivery pipeline; 32. Second delivery pump; 33. Filter; 34. Detection system; 341. Valve block; 342. Flow meter; 343. Temperature sensor; 344. Pressure sensor; 4. Oil replenishment system; 5. Electronic control system; 6. Drive motor; 7. Agitator shaft; 8. Agitator paddle. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-4 This application is described in further detail.

[0033] An embodiment of the present application discloses a high-temperature lubricating oil system for an aviation engine.

[0034] Example 1:

[0035] Reference Figure 1 and Figure 2 The high-temperature lubricating oil system in this application includes an oil tank 1, a heating circulation device 2, and a main oil circuit 3. The heating circulation device 2 includes a circulation pipeline 21, a first delivery pump 23, and a heater 22. The oil inlet and oil outlet of the circulation pipeline 21 are respectively connected to the oil tank 1. The first delivery pump 23 is installed on the circulation pipeline 21, and the heater 22 is in communication with the circulation pipeline 21. The oil inlet and oil outlet of the main oil circuit 3 are respectively connected to the oil tank 1. The main oil circuit 3 and the circulation pipeline are separately arranged relative to the oil tank 1.

[0036] Specifically, the fuel tank 1 is a closed container for storing oil. The capacity of the fuel tank 1 is determined according to the actual needs of the engine and is usually between 100-200 liters.

[0037] In this embodiment, the material of the fuel tank 1 body is high-hardness carbon steel that can withstand high loads and high pressures. At the same time, the carbon steel is sprayed with plastic to improve the wear resistance and corrosion resistance of the material. It will solidify to form a thin film coating under high temperature environment to adapt to the high temperature and high pressure environment of the aircraft engine. In other embodiments, the material of the fuel tank 1 can also be selected from high-temperature resistant and corrosion-resistant stainless steel.

[0038] Specifically, the oil tank 1 is connected to the heating circulation pipeline 21 through the oil inlet and oil outlet at the bottom of the side wall facing the heater 22, so that the hot flow and cold flow in the oil tank 1 form convection at the bottom, ensuring that the oil is heated evenly. At the same time, manual ball valves corresponding to the port size are provided at the oil inlet and oil outlet to control the circulation pipeline 21.

[0039] Furthermore, the oil inlet and return port of the oil tank 1 are arranged at the bottom of the side wall of the oil tank 1 facing away from the heater 22, and a manual ball valve of matching size is provided at the port to control the switch for flow between the oil tank 1 and the main oil circuit 3. During use, the oil can be allowed to flow into the main oil circuit 3 after the heating circulation device 2 has balanced the temperature of the oil tank 1.

[0040] Specifically, the first delivery pump 23 includes a gear pump, a motor and a bell coupling. The gear pump can provide a constant flow rate and pressure, can handle high-viscosity liquids, and is suitable for the oil circulation delivery in the heating circulation device 2 of the present application.

[0041] Specifically, the power of the heater 22 of the present application is set to 18KW, and it is independently placed outside the main oil circuit 3. When the lubricating oil system heating circulation device 2 is started, the oil in the oil tank 1 needs to be heated for about 30 minutes through the circulation pipeline 21 to the heater 22 before it reaches a working temperature of 150°C. After the oil temperature is uniform and stable, it flows into the main oil circuit 3.

[0042] Reference Figure 1 and Figure 3 Furthermore, a liquid level relay 11 and a magnetic flap liquid level gauge 12 are provided on the top of the fuel tank 1, and an oil replenishment system 4 is provided at the bottom of the fuel tank 1 away from the heater 22. The oil replenishment system 4 is electrically connected to the liquid level relay 11 and the magnetic flap liquid level gauge 12. The oil replenishment system 4 receives liquid level signals from the liquid level relay 11 and the magnetic flap liquid level gauge 12 to perform feedback adjustment on the oil replenishment to ensure that the amount of lubricating oil in the fuel tank 1 is stable.

[0043] Furthermore, the oil tank 1 is provided with a temperature sensor 343 to detect the temperature of the oil in the oil tank 1 , and to determine whether the oil has reached the operating temperature and whether it can flow into the main oil circuit 3 through the temperature sensor 343 .

[0044] Reference Figure 1 and Figure 3In this embodiment, the outer wall of the fuel tank 1 is provided with an insulating shell 13, and the insulating shell 13 is made of a multi-layer composite material, with an inner layer of aluminum foil, a middle layer of foam plastic, and an outer layer of glass fiber, which effectively isolates the transfer of external heat and keeps the temperature inside the fuel tank 1 stable. The thickness of the insulating shell 13 is determined according to the size of the fuel tank 1 and the required insulation effect, and is usually between 10-30 mm. In other embodiments, the material of the insulating shell 13 can also be a single-layer polystyrene foam board or perlite and other insulating materials.

[0045] Reference Figure 1 and Figure 2 Specifically, the main oil circuit 3 includes a main delivery pipeline 31. The flow rate of the circulation pipeline 21 and the main delivery pipeline 31 in the usage scenario of this application is approximately 0.5~3.5L / min, and the pipe diameter of the circulation pipeline 21 and the main delivery pipeline 31 is set between 30-40mm.

[0046] Specifically, a second delivery pump 32 is provided on the main delivery pipeline 31. The second delivery pump 32 includes a gear pump, a bell coupling, a variable frequency motor and a frequency converter. The variable frequency motor and the frequency converter can control the flow and pressure more accurately.

[0047] Specifically, a filter 33 is further provided on the main delivery pipeline 31 , and the precision of the filter 33 is 10 μm.

[0048] Specifically, a detection system 34 is also provided on the main delivery pipeline 31. The detection system 34 is used to detect the temperature and pressure of the delivered oil. The detection system 34 includes a valve block 341, a flow meter 342, a pressure gauge, a temperature sensor 343, and a pressure sensor 344. The flow meter 342, the pressure gauge, the temperature sensor 343, and the pressure sensor 344 are integrated and installed on the valve block 341 in sequence. The temperature sensor 343 is electrically connected to the heater 22 for real-time monitoring and adjustment of the oil temperature. The pressure gauge and the pressure sensor 344 are electrically connected to the second delivery pump 32 for real-time monitoring and adjustment of the oil pressure.

[0049] In this embodiment, the high-temperature lubricating oil system also includes an electronic control system 5, which is provided with an explosion-proof electronic control cabinet and a transmission cable. The transmission cable is electrically connected to the detection system 34, the second delivery pump 32 and the heater 22 respectively. The electronic control system 5 can realize automatic control and adjustment of the entire system. In other embodiments, the electrical connection method can also be a wireless connection, such as setting up an infinite sensor node and a wireless communication module.

[0050] The working principle of this embodiment is as follows: the heating circulation device 2 and the main oil circuit 3 are independently arranged relative to the oil tank 1. Before the oil flows to the main oil circuit 3, the oil is first transported to the heater 22 for heating by the first delivery pump 23 as a power device in the circulation pipeline 21, and then transported back to the oil tank 1. In this cycle, the oil temperature in the oil tank 1 is raised to the required level in a short time. At the same time, the oil circulation forms convection, so that the oil temperature in the oil tank 1 is evenly distributed, avoiding uneven temperature causing different viscosity and affecting the quality of the lubricating oil. The temperature sensor 343 is used to feedback the oil tank temperature signal. When the oil temperature quality reaches the working requirement, the oil temperature is evenly distributed. When the oil is required, the oil flows into the main oil circuit 3 through the oil inlet end of the main oil circuit 3 driven by the second delivery pump 32. The oil passes through the filter 33 in the main oil circuit 3 to filter out impurities and improve the quality of the oil. The oil is then delivered to the detection system 34, and is sequentially detected by the flow meter 342, the pressure gauge, the temperature sensor 343, and the pressure sensor 344. The oil temperature and pressure are precisely controlled under the regulation of the electronic control system 5, and finally delivered to the engine. The engine delivers the oil to the return port through the main delivery pipeline 31, and the oil is returned to the fuel tank 1, forming a main oil circuit 3 circulation. The fuel tank 1 is replenished with oil through liquid level detection to ensure the normal operation of the oil circuit.

[0051] Example 2:

[0052] Reference Figure 4 , the difference between this embodiment and the above embodiment is that:

[0053] Specifically, the oil inlet end of the circulation pipeline 21 is connected to the bottom of the side wall of the oil tank 1, and the oil outlet end is connected to the top of the oil tank 1. The insulating shell 13 is provided with a through hole so that the oil can be connected to the oil outlet end through the pipeline. Different from the embodiment 1 in which the oil temperature is uniformed by bottom circulation convection, the oil in this embodiment forms upper and lower circulation convection, avoiding uneven oil temperature at the top and bottom.

[0054] Furthermore, this embodiment is designed with a tank stirring system inside the oil tank 1, and the tank stirring system includes a drive motor 6 fixedly connected to the top center of the oil tank 1, a stirring shaft 7 connected to the central axis of the oil tank 1, and a stirring paddle 8 fixedly connected to the stirring shaft 7. The drive motor 6 is fixedly connected to the stirring shaft 7 near the top wall end of the oil tank 1, driving the stirring shaft 7 to rotate, thereby driving the stirring paddle 8 to rotate, stirring the oil, further balancing the oil temperature in the oil tank 1, making the temperature distribution of the oil tank 1 uniform, and at the same time driving the oil to move, so that it reaches the required temperature more quickly, thereby improving the heating rate.

[0055] The advantages of this embodiment over the first embodiment are: better temperature distribution uniformity, better oil lubrication quality, and higher heating rate.

[0056] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A high-temperature lubricating oil system for an aircraft engine, characterized by: The invention comprises an oil tank (1), a heating circulation device (2) and a main oil circuit (3), wherein the heating circulation device (2) comprises a circulation pipeline (21), a first delivery pump (23) and a heater (22), wherein the oil inlet end and the oil outlet end of the circulation pipeline (21) are respectively connected to the oil tank (1), the first delivery pump (23) is arranged on the circulation pipeline (21), and the heater (22) is communicated with the circulation pipeline (21), wherein the oil inlet end and the oil return end of the main oil circuit (3) are respectively connected to the oil tank (1), and the main oil circuit (3) and the circulation pipeline (21) are respectively independently arranged relative to the oil tank (1).

2. A high-temperature lubricating oil system for an aircraft engine according to claim 1, characterized in that: The oil inlet end and the oil outlet end of the circulation pipeline (21) are respectively connected to the bottom of the side wall of the oil tank (1) facing the heater (22); the oil inlet end and the oil return end of the main oil circuit (3) are respectively connected to the bottom of the side wall of the oil tank (1) facing away from the heater (22).

3. The high-temperature lubricating oil system for an aircraft engine according to claim 1, characterized in that: The oil outlet end of the circulation pipeline (21) is connected to the top of the oil tank (1), and the oil inlet end of the circulation pipeline (21) is connected to the bottom of the oil tank (1). A driving motor (6) is installed on the top of the oil tank (1). A stirring shaft (7) is provided at the central axis of the oil tank (1). One end of the stirring shaft (7) is connected to the output end of the driving motor (6), and a stirring paddle (8) is connected to the stirring shaft (7).

4. The high-temperature lubricating oil system for an aircraft engine according to claim 1, characterized in that: The outer wall of the oil tank (1) is also provided with a heat-insulating shell (13).

5. The high-temperature lubricating oil system for an aircraft engine according to claim 1, characterized in that: The oil supply system (4) is further included. The oil supply system (4) is connected to the bottom of the side wall of the oil tank (1) facing away from the heater (22). A liquid level relay (11) and a magnetic flap liquid level gauge (12) are provided on the top of the oil tank (1). The oil supply system (4) is electrically connected to the liquid level relay (11) and the magnetic flap liquid level gauge (12).

6. The high-temperature lubricating oil system for an aircraft engine according to claim 1, characterized in that: The main oil circuit (3) includes a main delivery pipeline (31), a second delivery pump (32) is provided on the main delivery pipeline (31), and a filter (33) and a detection system (34) are sequentially provided along the delivery direction of the main delivery pipeline (31), the filter (33) is used to filter impurities in the oil, and the detection system (34) is used to detect the temperature and pressure of the delivered oil. The high-temperature lubricating oil system also includes an electronic control system (5), and the electronic control system (5) is electrically connected to the detection system (34), the second delivery pump (32) and the heater (22) respectively.

7. A high-temperature lubricating oil system for an aircraft engine according to claim 6, characterized in that: The detection system (34) includes a valve block (341) and a temperature sensor (343) and a pressure sensor (344) installed on the same valve block (341). The main delivery pipeline (31) is connected to the valve block (341). The temperature sensor (343) is electrically connected to the heater (22). The pressure sensor (344) is electrically connected to the second delivery pump (32).

8. The high-temperature lubricating oil system for an aircraft engine according to claim 7, characterized in that: A flow meter (342) is also installed on the valve block (341), and the flow meter (342) is electrically connected to the second delivery pump (32).

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