External lubricating oil system of aero-engine test bed

Abstract

The invention relates to an external lubricating oil system of an aero-engine. The external lubricating oil system comprises a first oil tank, a second oil tank and the like; the system can work in an engine oil injection mode, a lubricating oil system self-flushing mode, an open type external circulation mode, an internal self-circulation mode and an engine oil change mode. Automatic switching of two oil supply and return modes of external open circulation and internal self-circulation of the engine can be achieved, the lubricating oil cooling and heating functions are achieved, the lubricating oil supply amount and the lubricating oil consumption amount can be measured, and the applicability of a test bed lubricating oil system in different scenes is improved.

Description

Technical Field

[0001] The invention relates to the field of lubricating oil system testing and provides an external lubricating oil system for an aircraft engine test bench. Background Art

[0002] The external lubricating oil system is an important accessory system for large-scale aircraft engine test benches such as turboshaft and turboprop, which is used to provide lubricating oil to aircraft engines. At present, the lubricating oil system of general test benches mainly adopts an open system, that is, the lubricating oil system can provide lubricating oil to 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 it is necessary to meet the external open circulation function and the internal self-circulation function of the engine at the same time. The traditional test bench lubricating oil system cannot meet the two oil supply modes at the same time, and its flexibility and adaptability are poor. Summary of the invention

[0003] The purpose of the present invention is to realize automatic switching between the two oil supply and return modes of the engine, namely, external open circulation and internal self-circulation, and at the same time have the functions of cooling and heating the lubricating oil, and have the functions of measuring the lubricating oil supply and lubricating oil consumption, so as to improve the applicability of the test bench lubricating oil system in different scenarios.

[0004] The technical solution of the present invention is:

[0005] Provided is an external lubricating oil system for an aircraft engine, in which a fuel tank 1 supplies fuel to a mode selection valve 4 through an oil pump 3, the mode selection valve 4 forms a conduction selection between a circulating fuel supply pipeline 5 and a main fuel supply pipeline 10, the circulating fuel supply pipeline 5 is conducted to a front-end fuel replenishment pipeline 45, the main fuel supply pipeline 10 is selectively conducted to a first fuel tank and a second fuel tank through a fuel tank selection valve 11, the first fuel tank and the second fuel tank are both connected to a replenishment selection valve 19, the replenishment selection valve 19 can selectively conduct the first fuel tank or the second fuel tank to the front-end fuel replenishment pipeline 45, the front-end fuel replenishment pipeline 45 is connected to a fuel supply / circulation selection valve 22, and a flow meter 39 is provided in the front-end fuel replenishment pipeline 45, the fuel supply / circulation selection valve 22 can selectively connect the front-end fuel replenishment pipeline 45 to an auxiliary fuel inlet pipeline 23 or a short-circuit fuel inlet and return pipeline 34 The auxiliary oil inlet line 23 guides the lubricating oil into the engine, the main oil return stage and the rear bearing oil return stage of the engine guide the return oil into the oil-gas separator 37, the oil outlet of the oil-gas separator 3 is guided to the open / closed selection switch valve 26 through the engine oil return line 35, the oil inlet and return short-circuit oil line 34 is connected to the engine oil return line 35, and the open / closed selection switch valve 26 selectively guides the open oil return line 41 or the main oil inlet line 24, the main oil inlet line 24 is connected to the auxiliary oil inlet line 23 through the stop valve 25, the open oil return 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 3 guides the oil and gas collection selection valve 14, and the oil and gas collection selection valve 14 selectively guides the first oil tank or the second oil tank;

[0006] 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;

[0007] When working in the engine oil injection mode, the lubricating 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 oil replenishment front end pipeline 45, the oil supply / circulation selection valve 22, and the auxiliary oil inlet pipeline 23;

[0008] When the lubricating oil system is in the self-flushing mode, the lubricating oil passes through the oil tank 1, the oil pump 3, the mode selection valve 4, the circulating oil supply pipeline 5, the oil replenishment front-end pipeline 45, the oil supply / circulation selection valve 22, the oil return short-circuit oil pipeline 34, the open / closed selection switch valve 26, the open oil return pipeline 41, and the oil return selection valve 20 to be directed to the first oil tank 6 or the second oil tank, forming a one-way flushing;

[0009] When working in the open external circulation mode, the lubricating oil is directed from the first oil tank or the second oil tank through the oil replenishment selection switch 19, the front end of the oil replenishment oil circuit 45, the oil supply / circulation selection valve 22, the auxiliary oil inlet line 23, the main oil return stage and the rear bearing oil return stage, the oil-gas separator 37, the engine oil return line 35, the open / closed selection switch 26, the open oil return line 41, and the oil return selection valve 20 to 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 lubricating oil engine return oil 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 separated by the oil-gas separator are injected into the engine to realize the closed circulation of the lubricating oil system;

[0011] When working in the engine oil change mode, the lubricating oil is stored in the second oil tank 44, and is delivered to the first oil tank through the oil replenishment selection switch 19, the front end 45 of the oil replenishment oil circuit, the oil supply / circulation selection valve 22, the auxiliary oil inlet line 23, the main return oil stage and the rear bearing return oil stage, the oil-gas separator 37, the engine return oil line 35, the open / closed selection switch 26, the open return oil line 41, and the return oil selection valve 20, so as to replace the first oil tank oil with the second oil tank oil.

[0012] Furthermore, a bypass line 31, a filter selection valve 33, a return oil filter 32, a heat exchanger 40, a selection valve 28, a heat dissipation valve 29 and a heat exchange branch 27 are also provided between the engine return oil line 35 and the open / closed selection switch 26; the bypass line 31, the filter selection valve 33 and the return oil filter 32 constitute a filter bypass branch, which can selectively filter the return oil; 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 lubricating oil. Furthermore, the selection valve 28 is a proportional selection valve, which can control the ratio of cold oil to hot oil in the return oil.

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

[0014] Furthermore, the volume of the first fuel tank is larger than that of the second fuel tank.

[0015] Furthermore, the rear bearing oil return stage includes a booster pump.

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

[0017] Furthermore, if the engine is short of lubricating oil, the lubricating oil can be replenished to the engine through the first lubricating oil tank 6 and the second lubricating oil tank 44 via the oil replenishment selection switch 19.

[0018] The advantages of the present invention are as follows: the present invention can realize automatic switching between the two oil supply and return modes of the engine, namely, external open circulation and internal self-circulation, and at the same time has the functions of cooling and heating the lubricating oil, and has the functions of measuring the lubricating oil supply and lubricating oil consumption, thereby improving the applicability of the test bench lubricating oil system in different scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

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

[0025] Among them: oil pump 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 drain pipeline 7, first oil tank 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 drain pipeline 17, second oil tank supply pipeline 18, oil replenishment selection valve 19, return oil selection valve 20, engine oil pump 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 / closed selection switch 26, heat exchange branch 27, selection valve 28, heat dissipation selection valve 29, return oil gas pipeline 30, bypass pipeline 31, return oil filter 32, filter selection valve 33, inlet and return oil short-circuit oil circuit 34, engine return oil pipeline 35, engine lubricating oil pump main boost stage 36, engine oil-gas separator 37, engine main oil inlet pipeline 38, flow meter 39, heat exchanger 40, open return oil pipeline 41, first tank return oil pipeline 42, second tank return oil pipeline 43, second tank 44, oil replenishment front end pipeline 45. DETAILED DESCRIPTION

[0026] The disclosed examples will be more fully described with reference to the accompanying drawings, in which some (but not all) of the disclosed examples are shown. In fact, many different examples may be described and these examples should not be construed as limited to the examples set forth herein. Instead, these examples are described so that this disclosure will be thorough and complete and will fully convey the scope of the disclosure to those skilled in the art.

[0027] Provided is an external lubricating oil system for an aircraft engine, in which a fuel tank 1 supplies fuel to a mode selection valve 4 through an oil pump 3, the mode selection valve 4 forms a conduction selection between a circulating fuel supply pipeline 5 and a main fuel supply pipeline 10, the circulating fuel supply pipeline 5 is conducted to a front-end fuel replenishment pipeline 45, the main fuel supply pipeline 10 is selectively conducted to a first fuel tank and a second fuel tank through a fuel tank selection valve 11, the first fuel tank and the second fuel tank are both connected to a replenishment selection valve 19, the replenishment selection valve 19 can selectively conduct the first fuel tank or the second fuel tank to the front-end fuel replenishment pipeline 45, the front-end fuel replenishment pipeline 45 is connected to a fuel supply / circulation selection valve 22, and a flow meter 39 is provided in the front-end fuel replenishment pipeline 45, the fuel supply / circulation selection valve 22 can selectively connect the front-end fuel replenishment pipeline 45 to an auxiliary fuel inlet pipeline 23 or a short-circuit fuel inlet and return pipeline 34 The auxiliary oil inlet line 23 guides the lubricating oil into the engine, the main oil return stage and the rear bearing oil return stage of the engine guide the return oil into the oil-gas separator 37, the oil outlet of the oil-gas separator 3 is guided to the open / closed selection switch valve 26 through the engine oil return line 35, the oil inlet and return short-circuit oil line 34 is connected to the engine oil return line 35, and the open / closed selection switch valve 26 selectively guides the open oil return line 41 or the main oil inlet line 24, the main oil inlet line 24 is connected to the auxiliary oil inlet line 23 through the stop valve 25, the open oil return 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 3 guides the oil and gas collection selection valve 14, and the oil and gas collection selection valve 14 selectively guides the first oil tank or the second oil tank;

[0028] 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;

[0029] When working in the engine oil injection mode, the lubricating 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 oil replenishment front end pipeline 45, the oil supply / circulation selection valve 22, and the auxiliary oil inlet pipeline 23;

[0030] When the lubricating oil system is in the self-flushing mode, the lubricating oil passes through the oil tank 1, the oil pump 3, the mode selection valve 4, the circulating oil supply pipeline 5, the oil replenishment front-end pipeline 45, the oil supply / circulation selection valve 22, the oil return short-circuit oil pipeline 34, the open / closed selection switch valve 26, the open oil return pipeline 41, and the oil return selection valve 20 to be directed to the first oil tank 6 or the second oil tank, forming a one-way flushing;

[0031] When working in the open external circulation mode, the lubricating oil is directed from the first oil tank or the second oil tank through the oil replenishment selection switch 19, the front end of the oil replenishment oil circuit 45, the oil supply / circulation selection valve 22, the auxiliary oil inlet line 23, the main oil return stage and the rear bearing oil return stage, the oil-gas separator 37, the engine oil return line 35, the open / closed selection switch 26, the open oil return line 41, and the oil return selection valve 20 to 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 lubricating oil engine return oil 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 separated by the oil-gas separator are injected into the engine to realize the closed circulation of the lubricating oil system;

[0033] When working in the engine oil change mode, the lubricating oil is stored in the second oil tank 44, and is delivered to the first oil tank through the oil replenishment selection switch 19, the front end 45 of the oil replenishment oil circuit, the oil supply / circulation selection valve 22, the auxiliary oil inlet line 23, the main return oil stage and the rear bearing return oil stage, the oil-gas separator 37, the engine return oil line 35, the open / closed selection switch 26, the open return oil line 41, and the return oil selection valve 20, so as to replace the first oil tank oil with the second oil tank oil.

[0034] A bypass line 31, a filter selection valve 33, a return oil filter 32, a heat exchanger 40, a selection valve 28, a heat dissipation valve 29 and a heat exchange branch 27 are also provided between the engine return oil line 35 and the open / closed selection switch 26; the bypass line 31, the filter selection valve 33 and the return oil filter 32 constitute a filter bypass branch, which can selectively filter the return oil; 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 lubricating oil. Furthermore, the selection valve 28 is a proportional selection valve, which can control the ratio of cold and hot oil in the return oil.

[0035] The auxiliary oil inlet pipeline 23 is provided with the engine oil pump oil supply stage 21 and the engine oil pump main supercharging stage 36 in sequence. Furthermore, the stop valve 25 is connected to the upstream of the engine oil pump main supercharging stage 36 through the engine main oil inlet 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 includes a booster pump.

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

[0039] When the engine is short of lubricating oil, lubricating oil can be replenished to the engine through the first lubricating oil tank 6 and the second lubricating oil tank 44 via the oil replenishment selection switch 19.

[0040] The description of different advantageous arrangements has been presented for purposes of illustration and description, but the description is not intended to be exclusive or limited to examples of the disclosed form. Many modifications and variations will be apparent to those of ordinary skill in the art. Additionally, different advantageous examples may describe different advantages over other advantageous examples. The selected example or examples are chosen and described in order to best illustrate the principles of the examples, the practical application, and to enable those of ordinary skill in the art to understand the disclosure with various examples with various modifications suitable for the particular use contemplated.

Claims

1. An external lubricating oil system for an aircraft engine, characterized in that: In the system, the oil tank (1) supplies oil to the mode selection valve (4) through the oil pump (3). The mode selection valve (4) forms a conduction selection between the circulating oil supply pipeline (5) and the main oil supply pipeline (10). The circulating oil supply pipeline (5) is connected to the front-end oil supply pipeline (45). The main oil supply pipeline (10) is selectively connected to the first oil tank and the second oil tank through the oil tank selection valve (11). The first oil tank and the second oil tank are both connected to the oil supply selection valve (19). ), the oil replenishment selection valve (19) can selectively connect the first oil tank or the second oil tank to the oil replenishment front end pipeline (45), the oil replenishment front end pipeline (45) is connected to the oil supply / circulation selection valve (22), and a flow meter (39) is provided in the oil replenishment front end pipeline (45), the oil supply / circulation selection valve (22) can selectively connect the oil replenishment front end pipeline (45) to the auxiliary oil inlet pipeline (23) or the inlet and return oil short-circuit oil circuit (34), the auxiliary inlet The oil pipeline (23) guides the lubricating oil into the engine, and the main oil return stage and the rear bearing oil return stage of the engine guide the return oil into the oil-gas separator (37). The oil outlet of the oil-gas separator (3) is guided to the open / closed selection switch valve (26) through the engine oil return pipeline (35). The oil inlet and return short-circuit oil pipeline (34) is connected to the engine oil return pipeline (35), and the guide open / closed selection switch valve (26) selectively guides the open oil return pipeline (41) or the main oil inlet pipeline (24). The main oil inlet pipeline (24) is connected to the auxiliary oil inlet pipeline (23) through the stop valve (25). The open oil return pipeline (41) guides the return oil selection valve (20), and 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 (3) guides the oil and gas collection selection valve (14), and the oil and 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 working in the engine oil injection mode, the lubricating oil passes through the oil tank (1), the oil pump (3), the mode selection valve (4), the circulating oil supply pipeline (5), the oil replenishment front end pipeline (45), the oil supply / circulation selection valve (22), and the auxiliary oil inlet pipeline (23) to inject oil into the engine; When the lubricating oil system is in the self-flushing mode, the lubricating oil passes through the oil tank (1), the oil pump (3), the mode selection valve (4), the circulating oil supply pipeline (5), the oil replenishment front end pipeline (45), enters the oil supply / circulation selection valve (22), the oil return short-circuit oil circuit (34), the open / closed selection switch valve (26), the open oil return pipeline (41), and the oil return selection valve (20) and is guided to the first oil tank (6) or the second oil tank, thereby forming a one-way flushing. When operating in an open external circulation mode, the lubricating oil is guided from the first oil tank or the second oil tank through the oil replenishment selection switch (19), the front end of the oil replenishment oil circuit (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 the first oil tank (6) or the second oil tank, thereby forming a circulation; 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-gas return pipeline (30) and the oil-gas collection selection valve (14), and the lubricating oil engine 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) separated by the oil-gas separator are used to inject oil into the engine, thereby realizing the closed circulation of the lubricating oil system; When operating in the engine oil change mode, lubricating oil is stored in the second oil tank and flows to the first oil tank through the oil replenishment selection switch (19), the front end of the oil replenishment oil circuit (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), so as to replace the oil in the first oil tank with the oil in the second oil tank.

2. An external lubricating oil system for an aircraft engine according to claim 1, characterized in that: A bypass pipeline (31), a filter selection valve (33), a return oil filter (32), a heat exchanger (40), a selection valve (28), a heat dissipation valve (29) and a heat exchange branch (27) are also provided between the engine return oil pipeline (35) and the open / closed selection switch (26); the bypass pipeline (31), the filter selection valve (33) and the return oil filter (32) constitute a filter bypass branch, which can selectively filter the return oil; 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 perform heat exchange on the lubricating oil.

3. An external lubricating oil system for an aircraft engine as claimed in claim 2, characterized in that: The selection valve (28) is a proportional selection valve capable of controlling the ratio of hot and cold oil in the return oil.

4. The external lubricating oil system for an aircraft engine according to claim 1, characterized in that: The auxiliary oil inlet pipeline (23) is provided with an engine lubricating oil pump oil supply stage (21) and an engine lubricating oil pump main boost stage (36) in sequence.

5. An external lubricating oil system for an aircraft engine as claimed in claim 4, characterized in that: The stop valve (25) is connected to the upstream of the main boosting stage (36) of the engine lubricating oil pump through the engine main oil inlet pipeline (38).

6. The external lubricating oil system for an aircraft engine according to claim 1, characterized in that: The volume of the first oil tank is greater than that of the second oil tank.

7. The external lubricating oil system for an aircraft engine according to claim 1, characterized in that: The rear bearing oil return stage includes a booster pump.

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

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

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