A simple micro-turbine engine oil recovery structure

Abstract

The present invention proposes a simple micro-turbine engine oil recovery structure, which is equipped with a supercharger, which uses centrifugal supercharging to supercharge the oil-gas mixture, and can be located at the front, middle and rear ends of the bearing cavity. The oil pump supplies oil to the engine and then divides it, lubricates and cools the bearing, and then merges it into the supercharger, and together with the high-pressure air mixed from each cavity, after being supercharged by the supercharger, it flows into the combustion chamber oil channel, and then enters the combustion chamber for combustion, realizing the recovery of lubricating oil. The present invention can significantly reduce the oil consumption rate of the turbine engine without increasing the complexity of the overall structure.

Description

Technical Field

[0001] The invention relates to a micro-sized turbine engine, in particular to a micro-sized turbine engine lubricating oil full recovery structure with a simple structure. Background Art

[0002] The function of the combustion chamber fuel supply system is to stably deliver fuel to the combustion chamber, and the main function of the lubrication system is to lubricate and cool the bearings. For medium and large turbine engines, independent lubrication systems are mostly used. However, for micro turbine engines, due to structural size and cost constraints, a fuel-lubricant integrated approach is often used, that is, a fuel supply pump and an oil inlet pipeline are used to divert the oil inside the engine, with one part used to lubricate the bearings and one part delivered to the combustion chamber for combustion. Two typical fuel-lubricant integrated structures are Figure 1 Most of the lubricating oil is discharged as exhaust gas, which causes the overall fuel consumption of the micro-turbine engine to be higher than that of pure pneumatic fuel consumption. Summary of the invention

[0003] The purpose of the present invention is to provide a simple micro-turbine engine lubricating oil full recovery structure to reduce the oil consumption rate of the micro-turbine engine.

[0004] The technical solution to achieve the purpose of the present invention is: a simple micro-turbine engine lubricating oil full recovery structure, equipped with a supercharger, which uses centrifugal supercharging to supercharge the oil-gas mixture, and can be located at the front end, middle and rear end of the bearing cavity. The oil pump supplies the oil into the engine and then diverts it. After lubricating and cooling the bearings, it is merged into the supercharger and flows into the combustion chamber oil channel together with the high-pressure air mixed in from each cavity after being supercharged by the supercharger, and then enters the combustion chamber for combustion, thereby realizing the recovery of lubricating oil.

[0005] Furthermore, the pressure of the introduced high-pressure air is the maximum value of the internal pressure of the engine, thereby ensuring that the supercharger can stably deliver the oil-gas mixture to the combustion chamber after a small amount of supercharging.

[0006] Furthermore, the high-pressure gas bleed passage has a rotary-static sealing structure for preventing leakage of high-pressure air, thereby ensuring the pressure gradient of the bleed passage. The rotary-static sealing structure can be a comb-teeth sealing structure or an expansion ring sealing structure.

[0007] Furthermore, there is a lubricating oil distribution channel to evenly distribute the oil before it enters the supercharger. The distribution channel can be an independent pipeline or a groove or cavity attached to the part.

[0008] Furthermore, a group of diversion channels are provided, which are used to guide the oil into the combustion chamber for combustion. The direction of the diversion channels is consistent with the speed direction of the oil-gas mixture at the outlet of the supercharger, thereby reducing flow losses.

[0009] Furthermore, there are two high-pressure air ducts, one of which is introduced into the bearing cavity to ensure the normal flow of oil in the bearing cavity, and the other can be introduced into the bearing cavity and can also be directly introduced into the supercharger to ensure the mixing of oil and gas.

[0010] Compared with the prior art, the present invention has the following significant advantages: 1) All the oil that passes through the lubricating oil cavity is recovered and transported into the combustion chamber, which can significantly reduce the fuel consumption rate of the turbine engine without increasing the complexity of the overall structure. 2) The sealing structure is used to prevent high-pressure air leakage and ensure the pressure gradient. 3) The rotation of the turbine engine itself is used to pressurize the oil and gas to ensure stable oil supply to the combustion chamber. 4) The main fuel oil outlet in the form of multiple outlets ensures the uniformity of the fuel supply to the combustion chamber. 5) The pressure gradient of the air inside the engine is used to ensure the reliable connection of the oil in various places inside the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a typical schematic diagram of a fuel and lubricating oil integrated structure.

[0012] Figure 2 This is the lubricating oil schematic diagram with the supercharger placed at the rear end.

[0013] Figure 3 Schematic diagram of the evenly distributed main fuel channel outlets.

[0014] Figure 4 Schematic diagram of the drainage groove in the combustion chamber oil channel.

[0015] Figure 5 This is the lubricating oil schematic diagram with the supercharger placed at the front end.

[0016] Figure 6 This is the lubricating oil schematic diagram with the supercharger placed in the middle.

[0017] In the figure, 1-the second high-pressure gas, 2-the bearing cavity oil passage, 3-the oil, 4-the main oil inlet, 5-the main fuel oil passage, 6-the first air duct, 7-the combustion chamber oil passage, 8-the supercharger, 9-the bearing, 10-the bearing cavity, 11-the second air duct, 12-the front sealing structure, 13-the combustion chamber, 14-the rear sealing structure, and 15-the first high-pressure gas. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0019] The present invention proposes a simple micro-turbine engine oil recovery structure, which relates to the oil supply and lubrication system of the turbine engine, and is equipped with a supercharger, which uses centrifugal supercharging to supercharge the oil-gas mixture, and can be located at the front, middle and rear end of the bearing cavity. It includes a total oil inlet, a main combustion chamber oil supply, a bearing cavity oil supply, and two high-pressure air bleed paths. All the oil in the oil cavity is recovered and transported to the combustion chamber. The structure does not increase the complexity of the structure, and can significantly reduce the oil consumption rate of the micro-turbine engine.

[0020] like Figure 2 As shown, the supercharger is placed in the lubricating oil recovery structure at the rear end. After the oil 3 enters the engine through the main oil inlet 4, it is divided into two paths. The first path reaches the supercharger 8 through the main fuel oil passage 5, and together with the first high-pressure gas 15 introduced by the first air inlet 6, after being pressurized by the supercharger 8, it passes through the combustion chamber oil passage 7 and enters the combustion chamber 13 for combustion; at the same time, the second path reaches the bearing cavity 10 through the bearing cavity oil passage 2, and driven by the second high-pressure air 1 introduced by the second air inlet 11, the bearing 9 is fully lubricated and cooled, and then reaches the supercharger 8. After being pressurized by the supercharger 8, it passes through the combustion chamber oil passage 7 and enters the combustion chamber 13 for combustion. Thus, the lubricating oil is fully recovered.

[0021] Furthermore, the pressure of the first high-pressure gas 15 and the second high-pressure gas 1 is the maximum value of the internal pressure of the engine, thereby ensuring that the mixed oil and gas can reach the pressure gradient for delivering the oil 3 to the combustion chamber 13 after a small amount of supercharging by the supercharger 8.

[0022] Furthermore, in order to reduce the pressure loss of the first high-pressure air 15 and the second high-pressure air 1 in the flow channel, on the one hand, a large air flow inlet area is used, and on the other hand, a front sealing structure 12 and a rear sealing structure 14 are set in the first air duct 6 and the second air duct 11 to prevent high-pressure air leakage and reduce pressure loss. The front and rear sealing structures can be a comb tooth structure or a ring structure.

[0023] Further, such as Figure 3 As shown, the main fuel outlet 501 is a multi-outlet structure, and the fuel is evenly sprayed toward the supercharger 8 through the main fuel outlet 501, thereby ensuring the uniformity of combustion.

[0024] Further, such as Figure 4 As shown, a drainage groove 701 is provided on the oil passage of the combustion chamber, and the rotation direction of the drainage groove 701 is consistent with the rotation direction of the oil and gas at the outlet of the supercharger, thereby reducing the oil and gas loss.

[0025] like Figure 5 As shown, the supercharger is placed in the lubricating oil recovery structure at the front end, and its principle is the same as the lubricating oil recovery structure principle in which the supercharger is located at the rear end, and the only difference is that the supercharger is set at a different position.

[0026] like Figure 6 As shown, the supercharger is placed in the lubricating oil recovery structure in the middle, and its principle is similar to the lubricating oil recovery structure in which the supercharger is placed at the rear end, except that the first and second air inlet passages both pass through the bearing cavity, while in the lubricating oil recovery structure in which the supercharger is placed at one end, the first air inlet passage is set not to pass through the bearing cavity. The specific principle of the lubricating oil recovery structure in which the supercharger is placed in the middle is as follows: after the oil 3 enters the engine through the oil main inlet 4, it is divided into two paths, the first path reaches the supercharger 8 through the main fuel oil passage 5, and after being pressurized by the supercharger 8, it passes through the combustion chamber oil passage 7 and enters the combustion chamber 13 for combustion, and the second path reaches the bearing cavity 10 through the lubricating oil cavity oil passage 2, and under the drive of the first path high-pressure gas 15 introduced by the first air inlet passage 6 and the second path high-pressure gas 1 introduced by the second air inlet passage 11, the bearing 9 is fully lubricated and cooled, and then reaches the supercharger 8, and after being pressurized by the supercharger 8, it passes through the combustion chamber oil passage 7 and enters the combustion chamber 13 for combustion, thereby realizing full recovery of the lubricating oil.

[0027] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0028] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A micro-turbine engine oil recovery structure, characterized in that: A supercharger is arranged in the middle of the bearing cavity. After the oil (3) enters the engine through the main oil inlet (4), it is divided into two paths. The first path reaches the supercharger (8) through the main fuel oil passage (5), and after being pressurized by the supercharger (8), it passes through the combustion chamber oil passage (7) and enters the combustion chamber (13) for combustion. The second path reaches the bearing cavity (10) through the bearing cavity oil passage (2), and under the drive of the first path high-pressure gas (15) introduced by the first air inlet passage (6) and the second path high-pressure gas (1) introduced by the second air inlet passage (11), the bearing (9) is fully lubricated and cooled, and then reaches the supercharger (8). After being pressurized by the supercharger (8), it passes through the combustion chamber oil passage (7) and enters the combustion chamber (13) for combustion.

2. The micro-turbine engine oil recovery structure according to claim 1 is characterized in that: The supercharger uses centrifugal supercharging to pressurize the oil-gas mixture.

3. The micro-turbine engine oil recovery structure according to claim 1 is characterized in that: The pressure of the first high-pressure gas (15) and the second high-pressure gas (1) is the maximum value of the internal pressure of the engine, so as to ensure that the mixed oil and gas can reach the pressure gradient for delivering the oil (3) to the combustion chamber (13) after a small amount of supercharging by the supercharger (8).

4. The micro-turbine engine oil recovery structure according to claim 1 is characterized in that: The first air duct (6) and the second air duct (11) are respectively provided with a static sealing structure to prevent leakage of high-pressure air.

5. The micro-turbine engine oil recovery structure according to claim 1 is characterized in that: The outlet of the main fuel oil passage (5) is a multi-outlet structure, and the fuel is evenly sprayed toward the supercharger (8) through the outlet of the main fuel oil passage to ensure uniform combustion.

6. The micro-turbine engine oil recovery structure according to claim 1 is characterized in that: A drainage groove (701) is provided on the combustion chamber oil passage (7), and the rotation direction of the drainage groove (701) is consistent with the rotation direction of oil and gas at the outlet of the supercharger, so as to reduce oil and gas losses.

7. The micro-turbine engine oil recovery structure according to claim 1 is characterized in that: An oil distribution flow channel is provided to evenly distribute the oil (3) before the oil enters the supercharger. The oil distribution flow channel is in the form of an independent pipeline or a groove or cavity attached to a component.

Images