Efficient composite lubricating oil cooling system

Abstract

According to the efficient composite lubricating oil cooling system, an outlet of an oil supply pump is connected with a first adjusting valve and an oil filter; the other end of the first regulating valve is connected with an oil tank inlet; the other end of the oil filter is connected with the flowmeter; the other end of the flowmeter is connected with a third temperature sensor; the other end of the third temperature sensor is connected with the second adjusting valve and the first pressure sensor. The other end of the second regulating valve is connected with a second pressure sensor; the other end of the second pressure sensor is connected with a generator controller; the other end of the generator controller is connected with the generator; the other end of the starter is connected with a second temperature sensor; the other end of the first pressure sensor is connected with the free turbine; the other end of the free turbine is connected with a first temperature sensor; the other ends of the second temperature sensor and the first temperature sensor are connected with an oil scavenger pump inlet; the oil scavenger pump outlet is connected with the air lubricating oil heat exchanger; the other end of the air-lubricating oil heat exchanger is connected with an oil tank inlet. Reasonable, safe and stable operation temperature of the power system is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of aeroengines, and particularly relates to an efficient composite lubricating oil cooling system. Background Art

[0002] The basic function of an aeroengine lubrication system is to continuously supply lubricating oil to engine bearings and gears to reduce friction and wear of mating moving surfaces, prevent corrosion and surface hardening, and take away the heat generated by friction and the heat of high-temperature parts and transfer it to the lubricating oil. At present, most aeroengines are closed systems, and the lubricating oil circulates in the engine lubrication system. Moreover, it is difficult for the aeroengine lubrication system to achieve lubrication and cooling with different lubricating oil flow rates.

[0003] Therefore, there is provided an efficient composite lubricating oil cooling system. Summary of the Invention

[0004] To solve the above problems existing in the prior art, the present invention provides an efficient composite lubricating oil cooling system, which ensures the reasonable, safe and stable operation temperature of the power system.

[0005] To achieve the above object, the present invention provides the following technical solutions: An efficient composite lubricating oil cooling system includes: a supply oil pump, an air-oil heat exchanger, and a return oil pump. The outlet of the supply oil pump is respectively connected to a first regulating valve and an oil filter. The other end of the first regulating valve is connected to the tank inlet. The other end of the oil filter is connected to a flow meter. The other end of the flow meter is connected to a third temperature sensor. The other end of the third temperature sensor is respectively connected to a second regulating valve and a first pressure sensor. The other end of the second regulating valve is connected to a second pressure sensor. The other end of the second pressure sensor is connected to a starting generator controller. The other end of the starting generator controller is connected to a starting generator. The other end of the starting generator is connected to a second temperature sensor. The other end of the first pressure sensor is connected to a free turbine. The other end of the free turbine is connected to a first temperature sensor. The other ends of the second temperature sensor and the first temperature sensor are both connected to the inlet of the return oil pump. The outlet of the return oil pump is connected to the air-oil heat exchanger. The other end of the air-oil heat exchanger is connected to the tank inlet and the first regulating valve.

[0006] Preferably, the lubricating oil flow rate at the outlet of the oil supply pump is greater than the lubricating oil flow rate required by the lubrication system under the rated operating conditions of the engine. The lubricating oil outside the rated flow rate at the outlet of the oil supply pump is returned to the fuel tank by controlling the opening degree of the first regulating valve.

[0007] Preferably, the opening degree of the first regulating valve is determined according to the reading of the flow meter.

[0008] Preferably, the opening degree of the second regulating valve is determined according to the pressure reading of the first pressure sensor.

[0009] Preferably, the temperature at the outlet position of the free turbine is monitored by the first temperature sensor to determine whether the lubricating oil flow rate of this branch meets the lubrication and cooling requirements of the free turbine bearing.

[0010] Preferably, the lubricating oil cooling effects of each branch are respectively judged according to the second temperature sensor and the first temperature sensor. When the temperature is too high, the lubricating oil flow rate of the branch is increased by increasing the opening degree of the second regulating valve to take away the heat.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention adopts a set of lubrication system to simultaneously meet the lubrication and cooling working requirements of different lubricating oil flow rates for the free turbine, the starting generator and the two branches of the starting generator controller, reduces the system complexity and equipment cost, reduces the weight of the engine, ensures the efficient operation of the turbogenerator engine while realizing the lightweight of the engine; A first regulating valve is added at the outlet of the oil supply pump to adjust the lubricating oil flow rate of the system according to the heat dissipation requirements of different operating conditions of the engine, effectively adjusting the total lubricating oil flow rate required by the lubrication system at different operating conditions of the engine, and can complete the lubrication and cooling work at different operating conditions in a timely and effective manner; A second regulating valve is added to the branches of the starting generator and the starting generator controller. By adjusting the opening degree of the second regulating valve, the distribution of the lubricating oil flow rate in the two branches is controlled. The small flow rate of lubricating oil that meets the high-speed rotation lubrication requirements of the free turbine bearing also meets the large flow rate of lubricating oil required for heat dissipation of the internal structure of the starting generator, effectively realizing the simultaneous cooling of the free turbine and the starting generator and the starting generator controller, and improving the overall lubrication and cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, and do not constitute a limitation to the present invention. In the drawings: Figure 1 is a structural diagram of an efficient composite lubricating oil cooling system of the present invention.

[0013] In the figure: 1, oil supply pump; 2, first regulating valve; 3, oil filter; 4, fuel tank; 5, air-oil heat exchanger; 6, flow meter; 7, third temperature sensor; 8, second regulating valve; 9, first pressure sensor; 10, second pressure sensor; 11, starting generator controller; 12, starting generator; 13, second temperature sensor; 14, free turbine; 15, first temperature sensor; 16, oil return pump. Specific implementation mode

[0014] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0015] As Figure 1 shown, a highly efficient and composite lubricating oil cooling system, characterized in that it includes: an oil supply pump 1 and an air-oil heat exchanger 5, the outlet of the oil supply pump 1 is respectively connected to a first regulating valve 2 and an oil filter 3; the other end of the first regulating valve 2 is connected to the inlet of the fuel tank 4; the other end of the oil filter 3 is connected to a flow meter 6; the other end of the flow meter 6 is connected to a third temperature sensor 7; the other end of the third temperature sensor 7 is respectively connected to a second regulating valve 8 and a first pressure sensor 9; the other end of the second regulating valve 8 is connected to a second pressure sensor 10; the other end of the second pressure sensor 10 is connected to a starting generator controller 11; the other end of the starting generator controller 11 is connected to a starting generator 12; the other end of the starting generator 12 is connected to a second temperature sensor 13; the other end of the first pressure sensor 9 is connected to a free turbine 14; the other end of the free turbine 14 is connected to a first temperature sensor 15; the other ends of the second temperature sensor 13 and the first temperature sensor 15 are both connected to the inlet of an oil return pump 16; the outlet of the oil return pump 16 is connected to the air-oil heat exchanger 5; the other end of the air-oil heat exchanger 5 is connected to the inlet of the fuel tank 4 and the first regulating valve 2.

[0016] In the embodiment, the lubricating oil flow rate at the outlet of the oil supply pump 1 is greater than the lubricating oil flow rate required by the lubricating system under the rated working condition of the engine. By controlling the opening of the first regulating valve 2, the lubricating oil outside the rated flow rate at the outlet of the oil supply pump 1 is returned to the fuel tank 4 to ensure the total lubricating oil flow rate required by the system.

[0017] In the embodiment, the opening of the first regulating valve 2 is determined according to the reading of the flow meter 6; when the engine is under overload conditions, the heat generated at the free turbine 14, the starting generator 12, and the starting generator controller 11 increases, and the lubricating oil flow rate required by the lubricating system also increases accordingly. At this time, the opening of the first regulating valve 2 is changed to increase the total lubricating oil volume of the lubricating system; the first regulating valve 2 at the outlet end of the oil supply pump 1 can effectively control the total lubricating oil flow rate of the lubricating system and ensure the orderly and efficient operation of the lubricating oil inside the system.

[0018] In the embodiment, since the lubricating oil flow rates required for lubricating and cooling the starting generator 12 and the free turbine 14 are different, a second regulating valve 8 is added to the branch of the starting generator controller 11 and the starting generator 12 to adjust the lubricating oil flow rate distribution of the two branches. The valve opening of the second regulating valve 8 is determined according to the pressure reading of the first pressure sensor 9 to ensure that the lubricating oil flow rate of the free turbine 14 branch meets the working requirements.

[0019] In the embodiment, the temperature at the outlet position of the free turbine 14 is monitored by the first temperature sensor 15 to determine whether the lubricating oil flow rate of this branch meets the lubricating and cooling requirements of the free turbine bearing.

[0020] In the embodiment, the lubricating oil cooling effects of each branch are respectively judged according to the second temperature sensor 13 and the first temperature sensor 15. When the temperature is too high, the lubricating oil flow rate of the branch is increased by increasing the opening of the second regulating valve 8 to take away the heat.

[0021] Working principle: The oil supply pump 1 pumps out the lubricating oil from the fuel tank 4. After being adjusted by the first regulating valve 2, the lubricating oil flow rate required for the lubrication system to work in a cycle is obtained. The lubricating oil flows through the oil filter 3 and then the second regulating valve 8 adjusts and distributes the lubricating oil flow rates of the two branches. Then, after lubricating and cooling the two branches of the free turbine 14, the starting generator controller 11 and the starting generator 12, they converge, flow through the oil return pump 16, flow to the air-oil heat exchanger 5 to complete heat dissipation, and then flow to the fuel tank 4. Repeating the above process is the entire working process of the lubrication system.

[0022] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An efficient composite lubricating oil cooling system, characterized in that, Including: An oil supply pump (1), an air-oil heat exchanger (5), and a scavenge pump (16), The outlet of the oil supply pump (1) is respectively connected to a first regulating valve (2) and an oil filter (3); The other end of the first regulating valve (2) is connected to the inlet of a fuel tank (4); The other end of the oil filter (3) is connected to a flowmeter (6); The other end of the flowmeter (6) is connected to a third temperature sensor (7); The other end of the third temperature sensor (7) is respectively connected to a second regulating valve (8) and a first pressure sensor (9); The other end of the second regulating valve (8) is connected to a second pressure sensor (10); The other end of the second pressure sensor (10) is connected to a starting generator controller (11); The other end of the starting generator controller (11) is connected to a starting generator (12); The other end of the starting generator (12) is connected to a second temperature sensor (13); The other end of the first pressure sensor (9) is connected to a free turbine (14); The other end of the free turbine (14) is connected to a first temperature sensor (15); The other ends of the second temperature sensor (13) and the first temperature sensor (15) are both connected to the inlet of the scavenge pump (16); The outlet of the scavenge pump (16) is connected to the air-oil heat exchanger (5); The other end of the air-oil heat exchanger (5) is connected to the inlet of the fuel tank (4) and the first regulating valve (2).

2. The highly efficient composite lubricating oil cooling system according to claim 1, wherein The lubricating oil flow rate at the outlet of the oil supply pump (1) is greater than the lubricating oil flow rate required by the lubrication system under the rated operating condition of the engine. By controlling the opening degree of the first regulating valve (2), the lubricating oil outside the rated flow rate at the outlet of the oil supply pump (1) is returned to the fuel tank (4).

3. An efficient composite lubricating oil cooling system according to claim 1, characterized in that, Determine the opening degree of the first regulating valve (2) according to the reading of the flowmeter (6).

4. An efficient composite lubricating oil cooling system according to claim 1, characterized in that Determine the valve opening degree of the second regulating valve (8) according to the pressure reading of the first pressure sensor (9).

5. An efficient composite lubricating oil cooling system according to claim 1, characterized in that, Monitor the temperature at the outlet position of the free turbine (14) according to the first temperature sensor (15) to determine whether the lubricating oil flow rate in this branch meets the lubrication and cooling requirements of the free turbine bearing.

6. An efficient composite lubricating oil cooling system according to claim 1, characterized in that, Respectively judge the lubricating oil cooling effects of each branch according to the second temperature sensor (13) and the first temperature sensor (15). When the temperature is too high, increase the lubricating oil flow rate in the branch through the opening degree of the second regulating valve (8) to take away the heat.

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