Aero-engine test stand external oil system

Abstract

The application relates to an aero-engine external oil system, which comprises a first oil tank, a second oil tank and the like; the system can work in an engine oil injection mode, an oil system self-flushing mode, an open external circulation mode, an internal self-circulation mode and an engine oil change mode; the application can realize automatic switching of two oil supply and return modes of the external open circulation and the internal self-circulation of the engine, simultaneously has the functions of cooling and heating the oil, and has the functions of measuring the oil supply amount and the oil consumption amount, and the applicability of the oil system of the test bench under different scenes is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of lubricating oil system test, and provides an external lubricating oil system of an aero-engine test bench. BACKGROUND

[0002] The external lubricating oil system is an important accessory system of a large aero-engine test bench such as a turboshaft turboprop, and is used to provide lubricating oil for an aero-engine. At present, the lubricating oil system of a general test bench mainly adopts an open system, that is, the lubricating oil system can provide lubricating oil for the engine, and the lubricating oil flowing out after the engine is running enters the lubricating oil system for cooling and is provided to the engine again. However, according to the actual working needs of the engine, sometimes the external open circulation function and the internal self-circulation function of the engine need to be met at the same time. The traditional lubricating oil system of the test bench cannot meet the two oil supply modes at the same time, and the flexibility and adaptability are poor. SUMMARY

[0003] The purpose of the present application is to realize automatic switching of the two oil supply and return modes of the external open circulation and the internal self-circulation of the engine, to have the functions of cooling and heating lubricating oil, and to have the functions of measuring the lubricating oil supply amount and the lubricating oil consumption, and to improve the applicability of the lubricating oil system of the test bench under different scenes.

[0004] The technical scheme of the present application is:

[0005] An aero-engine external oil system is provided, in which an oil tank 1 is supplied with oil by an oil pump 3 to a mode selection valve 4, the mode selection valve 4 forms a conduction selection between a circulating oil supply pipeline 5 and a main oil supply pipeline 10, the circulating oil supply pipeline 5 is conducted to a pre-feed pipeline 45, the main oil supply pipeline 10 is selectively conducted to a first oil tank and a second oil tank through an oil tank selection valve 11, the first oil tank and the second oil tank are both communicated to a pre-feed selection valve 19, the pre-feed selection valve 19 can selectively conduct the first oil tank or the second oil tank with the pre-feed pipeline 45, the pre-feed pipeline 45 is communicated to a supply / circulation selection valve 22, and the pre-feed pipeline 45 is provided with a flow meter 39, the supply / circulation selection valve 22 selectively conducts the pre-feed pipeline 45 with an auxiliary oil inlet pipeline 23 or an inlet and return oil short pipeline 34, the auxiliary oil inlet pipeline 23 leads the oil to the engine, the main oil return stage and the rear bearing oil return stage of the engine lead the return oil to an oil-gas separator 37, the oil outlet of the oil-gas separator 37 is conducted to an open / close selection switch valve 26 through an engine return pipeline 35, the inlet and return oil short pipeline 34 is communicated to the engine return pipeline 35, the open / close selection switch valve 26 selectively conducts an open return pipeline 41 or a main oil inlet pipeline 24, the main oil inlet pipeline 24 is conducted to the auxiliary oil inlet pipeline 23 through a stop valve 25, the open return pipeline 41 is conducted to a return selection valve 20, the return selection valve 20 selectively conducts the first oil tank or the second oil tank, the gas outlet of the oil-gas separator 37 is conducted to an oil-gas collection selection valve 14, the oil-gas collection selection valve 14 selectively conducts the first oil tank or the second oil tank;

[0006] The system can work in an engine oil injection mode, an oil system self-flushing mode, an open external circulation mode, an internal self-circulation mode and an engine oil change mode;

[0007] When working in the engine oil injection mode, the oil is injected into the engine through the oil tank 1, the oil pump 3, the mode selection valve 4, the circulating oil supply pipeline 5, the pre-feed pipeline 45, the supply / circulation selection valve 22 and the auxiliary oil inlet pipeline 23;

[0008] When working in the oil system self-flushing mode, the oil is flushed through the oil tank 1, the oil pump 3, the mode selection valve 4, the circulating oil supply pipeline 5, the pre-feed pipeline 45, the supply / circulation selection valve 22, the inlet and return oil short pipeline 34, the open / close selection switch valve 26, the open return pipeline 41 and the return selection valve 20 to the first oil tank 6 or the second oil tank, forming a one-way flushing;

[0009] When working in the open outer circulation mode, the oil from the first oil tank or the second oil tank passes through the oil supplement selection switch 19, the oil supplement oil path front end 45, the oil supply / circulation selection valve 22, the auxiliary oil inlet pipeline 23, the main oil return stage and the rear bearing oil return stage, the oil gas separator 37, the engine oil return pipeline 35, the open / closed selection switch 26, the open oil return pipeline 41, and the oil return selection valve 20 to guide the first oil tank 6 or the second oil tank, forming a circulation.

[0010] When working in the internal self-circulation mode, the gas separated by the oil gas separator is returned to the first oil tank or the second oil tank through the oil return gas pipeline 30 and the oil gas collection selection valve 14, and the oil separated by the oil gas separator is injected into the engine through the engine oil return pipeline 35, the open / closed selection switch 26, the main oil inlet pipeline 24, the stop valve 25, and the auxiliary oil inlet pipeline 23, realizing the closed circulation of the oil system.

[0011] When working in the engine oil replacement mode, the oil in the second oil tank 44 is stored and replaced into the first oil tank through the oil supplement selection switch 19, the oil supplement oil path front end 45, the oil supply / circulation selection valve 22, the auxiliary oil inlet pipeline 23, the main oil return stage and the rear bearing oil return stage, the oil gas separator 37, the engine oil return pipeline 35, the open / closed selection switch 26, the open oil return pipeline 41, and the oil return selection valve 20.

[0012] Further, a bypass pipeline 31, a filter selection valve 33, an oil return filter 32, a heat exchanger 40, a selection valve 28, a heat dissipation valve 29, and a heat exchange branch 27 are arranged between the engine oil return pipeline 35 and the open / closed selection switch 26; the bypass pipeline 31, the filter selection valve 33, and the oil return filter 32 constitute a filtered bypass branch, which can selectively filter the oil return; the heat exchanger 40, the selection valve 28, the heat dissipation valve 29, and the heat exchange branch 27 constitute a heat exchange branch, which can selectively heat exchange the oil. Further, the selection valve 28 is a proportional selection valve, which can control the cold / hot oil proportion of the oil return.

[0013] Further, the auxiliary oil inlet pipeline 23 is sequentially provided with an engine oil pump oil supply stage 21 and an engine oil pump main boost stage 36. Further, the stop valve 25 is connected to the upstream of the engine oil pump main boost stage 36 through an engine main oil inlet pipeline 38.

[0014] Further, the volume of the first oil tank is greater than that of the second oil tank.

[0015] Further, the rear bearing oil return stage includes a boost pump.

[0016] Further, the oil pump 3 is connected in parallel with an oil pump pressure regulating valve 2.

[0017] Further, the engine lacks lubricating oil, which can be supplemented to the engine through the first lubricating oil tank 6 and the second lubricating oil tank 44 via the oil supplement selection switch 19.

[0018] The advantage of the present application is that the present application can realize automatic switching of two oil supply and return modes of open circulation outside the engine and internal self-circulation, simultaneously has the functions of cooling and heating lubricating oil, and has the functions of measuring lubricating oil supply and consumption, and improves the applicability of the test bench lubricating oil system in different scenes. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a system overall schematic diagram of the present application;

[0020] Figure 2 is a schematic diagram of working in the engine oiling mode;

[0021] Figure 3 is a schematic diagram of working in the lubricating oil system self-flushing mode;

[0022] Figure 4 is a schematic diagram of working in the open external circulation mode;

[0023] Figure 5 is a schematic diagram of working in the internal self-circulation mode;

[0024] Figure 6 is a schematic diagram of working in the engine oil change mode;

[0025] Among them: oil pump oil tank 1, oil pump pressure regulating valve 2, oil pump 3, mode selection valve 4, circulating oil supply pipeline 5, first oil tank 6, first oil tank oil discharge pipeline 7, first oil tank oil supply pipeline 8, first oil tank recovery pipeline 9, main oil supply pipeline 10, oil tank selection valve 11, first branch 12, second branch 13, oil and gas collection selection valve 14, oil and gas pipeline 15, second oil tank recovery pipeline 16, second oil tank oil discharge pipeline 17, second oil tank oil supply pipeline 18, oil supplement selection valve 19, oil return selection valve 20, engine lubricating oil pump oil supply stage 21, oil supply / circulation selection valve 22, auxiliary oil inlet pipeline 23, main oil inlet pipeline 24, main oil inlet pipeline stop valve 25, open / close selection switch 26, heat exchange branch 27, selection valve 28, heat dissipation selection valve 29, oil return gas pipeline 30, bypass pipeline 31, oil return filter 32, filtration selection valve 33, inlet and return oil short oil circuit 34, engine oil return pipeline 35, engine lubricating oil pump main booster stage 36, engine oil and gas separator 37, engine main oil inlet pipeline 38, flow meter 39, heat exchanger 40, open oil return pipeline 41, first oil tank oil return pipeline 42, second oil tank oil return pipeline 43, second oil tank 44, oil supplement front pipeline 45. DETAILED DESCRIPTION

[0026] The disclosed examples will be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all, of the disclosed examples are shown. Indeed, these examples can be described and should be viewed in the context of various possible scenarios. In other words, the examples described herein should not be construed as being limiting, but rather, should be construed broadly enough to encompass not only the examples described herein, but also the various possible permutations of the technical solutions described herein.

[0027] An aero-engine external lubricating oil system is provided, in which an oil tank 1 is supplied with oil by an oil pump 3 to a mode selection valve 4, the mode selection valve 4 forms a conduction selection between a circulating oil supply pipeline 5 and a main oil supply pipeline 10, the circulating oil supply pipeline 5 is conducted to a supplementary oil front pipeline 45, the main oil supply pipeline 10 is selectively conducted to a first oil tank and a second oil tank through an oil tank selection valve 11, the first oil tank and the second oil tank are both communicated to a supplementary oil selection valve 19, the supplementary oil selection valve 19 can selectively conduct the first oil tank or the second oil tank to the supplementary oil front pipeline 45, the supplementary oil front pipeline 45 is conducted to an oil supply / circulation selection valve 22, and a flowmeter 39 is arranged in the supplementary oil front pipeline 45, the oil supply / circulation selection valve 22 selectively conducts the supplementary oil front pipeline 45 to an auxiliary oil inlet pipeline 23 or an inlet and return oil short-circuit oil path 34, the auxiliary oil inlet pipeline 23 leads lubricating oil into an engine, a main oil return stage and a rear bearing oil return stage of the engine lead return oil into an oil-gas separator 37, an oil outlet of the oil-gas separator 3 is conducted to an open / close selection switch valve 26 through an engine oil return pipeline 35, the inlet and return oil short-circuit oil path 34 is communicated to the engine oil return pipeline 35, the open / close selection switch valve 26 selectively conducts an open return oil pipeline 41 or a main oil inlet pipeline 24, the main oil inlet pipeline 24 is conducted to the auxiliary oil inlet pipeline 23 through a shut-off valve 25, the open return oil pipeline 41 is conducted to a return oil selection valve 20, the return oil selection valve 20 selectively conducts the first oil tank or the second oil tank, a gas outlet of the oil-gas separator 3 is conducted to an oil-gas collection selection valve 14, the oil-gas collection selection valve 14 selectively conducts the first oil tank or the second oil tank;

[0028] The system can work in an engine oil filling mode, a lubricating oil system self-flushing mode, an open external circulation mode, an internal self-circulation mode and an engine oil change mode;

[0029] When working in the engine oil filling mode, lubricating oil passes through the oil tank 1, the oil pump 3, the mode selection valve 4, the circulating oil supply pipeline 5, the supplementary oil front pipeline 45, the oil supply / circulation selection valve 22, the auxiliary oil inlet pipeline 23 to fill the engine with oil;

[0030] When working in the lubricating oil system self-flushing mode, lubricating oil passes through the oil tank 1, the oil pump 3, the mode selection valve 4, the circulating oil supply pipeline 5, the supplementary oil front pipeline 45, the oil supply / circulation selection valve 22, the inlet and return oil short-circuit oil path 34, the open / close selection switch valve 26, the open return oil pipeline 41, the return oil selection valve 20 to the first oil tank 6 or the second oil tank, forming a one-way flushing.

[0031] When working in the open outer circulation mode, the oil from the first oil tank or the second oil tank passes through the oil supplement selection switch 19, the oil supplement oil path front end 45, the oil supply / circulation selection valve 22, the auxiliary oil supply pipeline 23, the main oil return stage and the rear bearing oil return stage, the oil gas separator 37, the engine oil return pipeline 35, the open / closed selection switch 26, the open oil return pipeline 41, and the oil return selection valve 20 to guide the first oil tank 6 or the second oil tank, forming a circulation.

[0032] When working in the internal self-circulation mode, the gas separated by the oil gas separator is returned to the first oil tank or the second oil tank through the oil return gas pipeline 30 and the oil gas collection selection valve 14, and the oil separated by the oil gas separator is injected into the engine through the engine oil return pipeline 35, the open / closed selection switch 26, the main oil supply pipeline 24, the stop valve 25, and the auxiliary oil supply pipeline 23, realizing the closed circulation of the oil system.

[0033] When working in the engine oil replacement mode, the oil in the second oil tank 44 is stored and replaced into the first oil tank through the oil supplement selection switch 19, the oil supplement oil path front end 45, the oil supply / circulation selection valve 22, the auxiliary oil supply pipeline 23, the main oil return stage and the rear bearing oil return stage, the oil gas separator 37, the engine oil return pipeline 35, the open / closed selection switch 26, the open oil return pipeline 41, and the oil return selection valve 20.

[0034] The bypass pipeline 31, the filter selection valve 33, the oil return filter 32, the heat exchanger 40, the selection valve 28, the heat dissipation valve 29, and the heat exchange branch 27 are further arranged between the engine oil return pipeline 35 and the open / closed selection switch 26; the bypass pipeline 31, the filter selection valve 33, and the oil return filter 32 constitute a filtering bypass branch, which can selectively filter the oil return; the heat exchanger 40, the selection valve 28, the heat dissipation valve 29, and the heat exchange branch 27 constitute a heat exchange branch, which can selectively heat exchange the oil. Further, the selection valve 28 is a proportional selection valve, which can control the cold / hot oil ratio of the oil return.

[0035] The engine oil pump oil supply stage 21 and the engine oil pump main booster stage 36 are sequentially arranged on the auxiliary oil supply pipeline 23. Further, the stop valve 25 is connected to the upstream of the engine oil pump main booster stage 36 through the engine main oil supply pipeline 38.

[0036] The volume of the first oil tank is greater than that of the second oil tank.

[0037] The rear bearing oil return stage comprises a booster pump.

[0038] The oil pump 3 is connected in parallel with the oil pump pressure regulating valve 2.

[0039] The engine lacks oil, which can be supplemented to the engine through the first oil tank 6 and the second oil tank 44 via the oil supplement selection switch 19.

[0040] The description of the different advantageous arrangements has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the examples disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. Moreover, different advantageous examples can provide different advantages as compared to other advantageous examples. The chosen examples or examples are described to best explain the principles of the disclosure and a practical application, and to enable others skilled in the art to best utilize the disclosure in various embodiments and with various modifications as are suited to the particular use contemplated.

Claims

1. An external lubrication system for an aircraft engine, characterized in that: In the system, the oil tank (1) is supplied with oil to the mode selection valve (4) via the oil pump (3). The mode selection valve (4) forms a connection selection between the circulating oil supply line (5) and the main oil supply line (10). The circulating oil supply line (5) is connected to the replenishment front-end line (45). The main oil supply line (10) is selectively connected to the first oil tank and the second oil tank via the oil tank selection valve (11). Both the first oil tank and the second oil tank are connected to the replenishment selection switch (19). The replenishment selection switch (19) can selectively connect the first oil tank or the second oil tank to the replenishment front-end line (45). The replenishment front-end line (45) is connected to the oil supply / circulation selection valve (22), and the replenishment front-end line (45) is equipped with a flow meter (39). The oil supply / circulation selection valve (22) can selectively connect the replenishment front-end line (45) to the auxiliary oil inlet line (23) or the inlet / return oil short-circuit line (34). The oil inlet line (23) introduces lubricating oil into the engine. The main return oil stage and the rear bearing return oil stage of the engine introduce the return oil into the oil-gas separator (37). The oil outlet of the oil-gas separator (37) is guided to the open / closed selector switch (26) through the engine return oil line (35). The inlet and return oil short circuit (34) is connected to the engine return oil line (35). The open / closed selector switch (26) selectively guides the open return oil line (41) or the main inlet oil line (24). The main inlet oil line (24) is connected to the auxiliary inlet oil line (23) through the shut-off valve (25). The open return oil line (41) guides the return oil selection valve (20). The return oil selection valve (20) selectively guides the first oil tank or the second oil tank. The gas outlet of the oil-gas separator (37) guides the oil-gas collection selection valve (14). The oil-gas collection selection valve (14) selectively guides the first oil tank or the second oil tank. The system can operate in engine oil injection mode, lubricating oil system self-flushing mode, open external circulation mode, internal self-circulation mode, and engine oil change mode. When operating in engine oil injection mode, lubricating oil is injected into the engine through the oil tank (1), oil pump (3), mode selection valve (4), circulation oil supply line (5), replenishment front line line (45), oil supply / circulation selection valve (22), and auxiliary oil inlet line (23); When operating in the self-flushing mode of the lubricating oil system, the lubricating oil passes through the oil tank (1), oil pump (3), mode selection valve (4), circulation oil supply line (5), replenishment front-end line (45), enters the oil supply / circulation selection valve (22), inlet and return oil short-circuit oil line (34), open / closed selection switch (26), open return oil line (41), and return oil selection valve (20) and is guided to the first oil tank (6) or the second oil tank to form a one-way flush; When operating in open external circulation mode, lubricating oil flows from the first oil tank or the second oil tank through the replenishment selection switch (19), the replenishment front-end pipeline (45), the supply / circulation selection valve (22), the auxiliary oil inlet pipeline (23), the main return oil stage and the rear bearing return oil stage, the oil-gas separator (37), the engine return oil pipeline (35), the open / closed selection switch (26), the open return oil pipeline (41), and the return oil selection valve (20) to the first oil tank (6) or the second oil tank to form a circulation; When operating in internal self-circulation mode, the gas separated by the oil-gas separator returns to the first oil tank or the second oil tank through the return oil-gas pipeline (30) and the oil-gas collection selection valve (14). The lubricating oil separated by the oil-gas separator is injected into the engine through the lubricating oil return pipeline (35), the open / closed selection switch (26), the main oil inlet pipeline (24), the shut-off valve (25), and the auxiliary oil inlet pipeline (23), thereby realizing the closed circulation of the lubricating oil system. When operating in engine oil change mode, lubricating oil is stored in the second oil tank and then flows through the replenishment selection switch (19), the replenishment front-end pipeline (45), the supply / circulation selection valve (22), the auxiliary oil inlet pipeline (23), the main return oil stage and the rear bearing return oil stage, the oil-gas separator (37), the engine return oil pipeline (35), the open / closed selection switch (26), the open return oil pipeline (41), and the return oil selection valve (20) to the first oil tank, thereby replacing the oil in the first oil tank with the oil in the second oil tank.

2. The external lubrication system for an aircraft engine as described in claim 1, characterized in that: From the engine return oil line (35) to the on / off selector switch (26), there is also a bypass line (31), a filter selector valve (33), a return oil filter (32), a heat exchanger (40), a selector valve (28), a radiator valve (29), and a heat exchange branch (27); the bypass line (31), the filter selector valve (33), and the return oil filter (32) constitute a bypass branch for filtering, which can selectively filter the return oil; the heat exchanger (40), the selector valve (28), the radiator valve (29), and the heat exchange branch (27) constitute a heat exchange branch, which can selectively exchange heat with the lubricating oil.

3. An external lubrication system for an aircraft engine as described in claim 2, characterized in that: The selector valve (28) is a proportional selector valve, which can control the ratio of hot and cold oil in the return oil.

4. An external lubrication system for an aircraft engine as described in claim 1, characterized in that: The auxiliary oil inlet line (23) is provided with the engine oil pump supply stage (21) and the engine oil pump main boost stage (36) in sequence.

5. An external lubrication system for an aircraft engine as described in claim 4, characterized in that: The shut-off valve (25) is connected to the upstream of the main boost stage (36) of the engine oil pump through the engine main oil inlet line (38).

6. An external lubrication system for an aircraft engine as described in claim 1, characterized in that: The first fuel tank has a larger capacity than the second fuel tank.

7. An external lubrication system for an aircraft engine as described in claim 1, characterized in that: The rear bearing oil return stage includes a booster pump.

8. An external lubrication system for an aircraft engine as described in claim 1, characterized in that: The oil pump (3) is connected in parallel with an oil pump pressure regulating valve (2).

9. An external lubrication system for an aircraft engine as described in claim 1, characterized in that: If the engine is short of lubricating oil, lubricating oil can be replenished to the engine through the first oil tank (6) and the second oil tank (44) via the oil replenishment selection switch (19).

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