An integrated oil cooling system for small auxiliary power units

Abstract

The utility model provides a kind of integrated oil cooling system for small auxiliary power device, to solve the complex line design of prior art's oil cooler, overall structure space ratio is big, the problem of inconvenient maintenance. The system mainly includes an integrated oil radiator, set in the front of compressor inlet duct, its inside is equipped with common heat dissipation core body, for simultaneously cooling the high-temperature oil of engine and motor;Engine and motor's oil share an oil inlet main pipe and an oil outlet main pipe, radiator is cooled using compressor inlet airflow, traditional independent fan assembly is saved;Oil bypass valve with opening pressure of 160kPa is provided on the oil outlet main pipe, for system overpressure protection. The utility model effectively solves the problem of complex structure, heavy weight, inconvenient maintenance of traditional double radiator system, with the advantages of high integration, light weight, good reliability, convenient maintenance.

Description

Technical Field

[0001] This utility model relates to the field of power device heat dissipation technology, and in particular to an integrated lubricating oil cooling system for small auxiliary power devices. Background Technology

[0002] The small auxiliary power unit (APU) provides auxiliary electricity and compressed air to the aircraft. Its generator and engine generate a lot of heat during operation, which needs to be cooled by the lubricating oil system. Traditional small APU lubricating oil cooling systems typically have separate lubricating oil radiators for the engine and motor, and are equipped with dedicated fan assemblies for forced air cooling.

[0003] The problem is that the system requires two sets of heat sinks, connecting pipes and fans, which leads to a complex pipe design, a large overall structural space ratio, increased weight, and inconvenience in disassembly during maintenance, increasing maintenance costs and difficulty. Utility Model Content

[0004] This application addresses the shortcomings of the prior art by providing an integrated oil cooling system for small auxiliary power units. The system integrates the oil coolers of the engine and motor into one unit and utilizes the airflow from the compressor intake duct of the APU itself for cooling, which simplifies the structure, reduces weight, and makes maintenance more convenient.

[0005] The technical solution adopted in this utility model is as follows: An integrated lubricating oil cooling system for a small auxiliary power unit, comprising: An integrated oil cooler is located in front of the compressor intake duct; The oil cooler includes a common cooling core configured to simultaneously cool the high-temperature oil of the engine and the motor. The high-temperature lubricating oil generated by the motor and engine shares a common lubricating oil inlet manifold, which is connected to the lubricating oil inlet of the lubricating oil radiator. The high-temperature lubricating oil generated by the motor and engine shares a common lubricating oil outlet pipe, which is connected to the lubricating oil outlet of the lubricating oil radiator. The oil bypass valve is connected to the main oil outlet pipe and is used to open and relieve pressure when the system pressure is too high.

[0006] Furthermore, the lubricating oil radiator has its internal heat dissipation core fixed by a fixing frame. The side of the fixing frame adjacent to the heat dissipation core is a connecting plate. The lubricating oil inlet, lubricating oil outlet, and lubricating oil bypass valve are all located on the connecting plate and are connected to the heat dissipation core.

[0007] Furthermore, the air inlet of the oil radiator is equipped with a dust cover through the connection hole on the front panel, and its air outlet is connected to the air inlet of the compressor through the connection hole on the rear panel.

[0008] Furthermore, the interior of the heat dissipation core is composed of multiple partitions and heat dissipation fins. After the lubricating oil enters through the oil inlet, it is dispersed by pressure to each partition and exchanges heat with the cooling air through the heat dissipation fins.

[0009] Furthermore, the opening pressure of the oil bypass valve is set to 160 kPa.

[0010] The advantages of this utility model over the prior art are as follows: 1) Simplified structure: The lubricating oil cooling functions of the engine and motor are integrated into a single heat dissipation core, sharing the same inlet and outlet oil manifolds. This eliminates the need for two sets of radiators, fan assemblies, and complex piping in traditional designs, significantly reducing the system size and weight. 2) No additional fan power required: The radiator is placed in front of the compressor intake duct, and the high-speed, low-temperature air drawn in by the compressor or the turbine drives the airflow for cooling. No additional fan power is required, which is energy-saving and efficient. 3) Safety protection: The oil bypass valve with a preset opening pressure can automatically open when the oil pressure difference is too high, effectively protecting the radiator core from damage caused by pressure shock. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a system block diagram of the present invention; Figure 3 This is a schematic diagram showing the connection between this utility model and the compressor inlet. Figure 4 This is a schematic diagram of the internal structure of the heat dissipation core in this utility model; Figure 5 This is a schematic diagram of the installation of the lubricating oil bypass valve.

[0012] The components include: 1. Lubricating oil inlet; 2. Lubricating oil bypass valve; 3. Lubricating oil outlet; 4. Connecting hole; 5. Fixing frame; 6. Heat insulation plate; 7. Connecting plate; 8. Heat dissipation fins; 9. Adjusting handle; 10. Spring; 11. Plug; 12. Dust cover; 13. Compressor air inlet. Detailed Implementation

[0013] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0014] This invention provides an integrated lubricating oil cooling system for small auxiliary power devices, aiming to solve the problems of complex circuit design, large overall structural space occupation, and inconvenient maintenance of existing lubricating oil coolers.

[0015] like Figures 1 to 5 As shown, it includes an integrated oil cooler, which is located in front of the compressor inlet 13; The oil cooler includes a common cooling core configured to simultaneously cool the high-temperature oil of the engine and the motor. The high-temperature lubricating oil generated by the motor and engine shares a common lubricating oil inlet manifold, which is connected to the lubricating oil inlet 1 of the lubricating oil radiator. The high-temperature lubricating oil generated by the motor and engine shares a common lubricating oil outlet manifold, which is connected to the lubricating oil outlet 3 of the lubricating oil radiator. The oil bypass valve 2 is connected to the main oil outlet pipe and is used to open and relieve pressure when the system pressure is too high.

[0016] In one embodiment of this utility model, the lubricating oil radiator fixes the internal heat dissipation core through a fixing frame 5. The side of the fixing frame 5 adjacent to the heat dissipation core is a connecting plate 7. The lubricating oil inlet 1, the lubricating oil outlet 3, and the lubricating oil bypass valve 2 are all disposed on the connecting plate 7 and connected to the heat dissipation core.

[0017] In one embodiment of this utility model, the air inlet of the lubricating oil radiator is provided with a dust cover 12 through the connection hole 4 on the front panel, and its air outlet is connected to the air inlet of the compressor duct 13 through the connection hole 4 on the rear panel.

[0018] In one embodiment of this utility model, the interior of the heat dissipation core is composed of multiple partitions and heat dissipation fins 8. After the lubricating oil enters through the oil inlet, it is distributed to each partition by pressure and exchanges heat with the cooling air through the heat dissipation fins 8. The module selection of the heat dissipation core includes, but is not limited to, various models in the art, and is not limited here.

[0019] In one embodiment of this utility model, the opening pressure of the oil bypass valve 2 is set to 160 kPa.

[0020] The specific structure and working principle of this utility model are as follows: The present invention provides an oil cooling system, which includes an integrated oil radiator. The air outlet of the radiator is fixedly installed in front of the compressor air inlet 13 of the APU through the connection hole 4 on its fixing frame 5 using bolts. The air inlet of the radiator is fitted with a dust cover 12 through the connection hole 4 on the front frame, thereby ensuring that the flow direction of the cooling airflow is consistent with the air inlet direction of the compressor.

[0021] Specifically, the high-temperature lubricating oil from the external engine and motor is delivered to the lubricating oil inlet through a common lubricating oil inlet manifold and can enter the cooling core; the high-temperature lubricating oil generated by the motor and engine shares a common lubricating oil outlet manifold connected to the lubricating oil outlet of the lubricating oil cooler. At high altitudes, the lubricating oil cooling system uses high-speed, low-temperature air entering the lubricating oil cooler through the intake end to cool the lubricating oil before it is discharged from the exhaust end. When stationary on land, a turbine drives airflow into the intake end, where it passes through the cooling core to cool the high-temperature lubricating oil before it is discharged from the exhaust end.

[0022] The working principle of the heat dissipation core is as follows: the lubricating oil enters the lubricating oil cooler from the oil inlet 1, is dispersed by pressure into each baffle, and the lubricating oil transfers heat to the heat dissipation fins 8 through the baffles. The heat dissipation fins 8 come into contact with the cold air and exchange heat, and are discharged from the lubricating oil outlet 3.

[0023] A bypass valve 2 is also connected to the main oil outlet pipe. The bypass valve 2, connected internally to the main outlet pipe, contains an adjusting handle 9, a spring 10, and a plug 11. Its opening pressure can be set to 160 kPa by adjusting the preload of the spring 10. When the system pressure difference exceeds this value due to excessively high low-temperature oil viscosity or other reasons, the valve opens, and the lubricating oil bypasses directly back, thus protecting the heat sink core from damage.

[0024] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. An integrated lubricating oil cooling system for a small auxiliary power unit, characterized in that: include: An integrated lubricating oil cooler is located in front of the compressor intake duct (13); The oil cooler includes a common cooling core configured to simultaneously cool the high-temperature oil of the engine and the motor. The high-temperature lubricating oil generated by the motor and engine is connected to the lubricating oil inlet (1) of the lubricating oil radiator. The high-temperature lubricating oil generated by the motor and engine is connected to the lubricating oil outlet (3) of the lubricating oil radiator. The oil bypass valve (2) is connected to the main oil outlet pipe and is used to open and relieve pressure when the system pressure is too high.

2. The integrated lubricating oil cooling system for a small auxiliary power unit as described in claim 1, characterized in that: The lubricating oil radiator is fixed to the internal heat dissipation core by a fixing frame (5). The fixing frame (5) is adjacent to the heat dissipation core by a connecting plate (7). The lubricating oil inlet (1), lubricating oil outlet (3) and lubricating oil bypass valve (2) are all set on the connecting plate (7) and communicate with the heat dissipation core.

3. The integrated lubricating oil cooling system for a small auxiliary power unit as described in claim 1, characterized in that: The air inlet of the lubricating oil radiator is provided with a dust cover (12) through the connection hole (4) on the front panel, and its air outlet is connected to the air inlet of the compressor (13) through the connection hole (4) on the rear panel.

4. The integrated lubricating oil cooling system for a small auxiliary power unit as described in claim 1, characterized in that: The interior of the heat dissipation core is composed of multiple partitions and heat dissipation fins (8). After the lubricating oil enters through the lubricating oil inlet (1), it is dispersed by pressure to each partition and exchanges heat with the cooling air through the heat dissipation fins (8).

5. An integrated lubricating oil cooling system for a small auxiliary power unit as described in claim 1, characterized in that: The opening pressure of the oil bypass valve (2) is set to 160 kPa.

Images