Turboprop engine lubricating oil pressure adjusting system and adjusting method

Abstract

The invention provides a turboprop engine lubricating oil pressure adjusting system and adjusting method.The adjusting system comprises a lubricating oil tank output end, a lubricating oil pump and a filtering assembly, an engine, the lubricating oil pump and the lubricating oil tank are sequentially communicated through pipelines, the lubricating oil pump is communicated with the filtering assembly through a first pipeline, and a second pipeline is additionally arranged in the middle of the first pipeline and communicated with the lubricating oil tank; and a flow limiting assembly is mounted on the second pipeline. According to the lubricating oil system and the adjusting method, the first outlet end of the lubricating oil pump is additionally provided with the lubricating oil bypass oil way entering the lubricating oil tank in a pipeline parallel connection mode, and the lubricating oil output by the lubricating oil pump is shunted through the lubricating oil bypass oil way, so that the lubricating oil pressure of the lubricating oil main oil way is changed; the electric adjusting valve is used for adjusting and controlling the flow of the lubricating oil in the second pipeline, so that the variable test requirements of the lubricating oil pressure of the engine are met, and the technical problems that the lubricating oil pressure in the lubricating oil system is difficult to adjust in real time in the test and the lubricating oil pressure is inaccurate are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of lubricating oil systems, and in particular relates to a turboprop engine lubricating oil pressure regulating system and a regulating method. Background Art

[0002] In a certain turboprop engine assessment test, the lubricating oil limit pressure test is a must-do item, which at least checks the operating status of the lubricating oil system, reducer and other components of the engine under the minimum and maximum limit lubricating oil pressures, verifies the reliability of the lubricating oil system, assesses the structural integrity and durability of the engine, and provides support for the engine field test flight.

[0003] However, the current turboprop engine oil pump has limited pressure regulation capabilities, and is unable to adjust the oil pressure regulating valve in real time during the test, so that the engine oil pressure will always remain at a fixed oil pressure during the assessment test phase, and is unable to meet the test's flexible adjustment requirements; and the current main method for factory testing of engines is to observe whether the oil pressure value is within the required range during the test. If it does not meet the requirements, the engine needs to be stopped and the oil pump pressure regulating valve needs to be manually adjusted, that is, the pressure regulating cover is loosened and adjusted clockwise or counterclockwise to make the engine oil pressure meet the requirements, and multiple tests are performed to meet the test requirements. Real-time adjustments cannot be made during the test, which directly affects the test efficiency and accuracy. Summary of the invention

[0004] In view of the above problems, the present invention proposes a turboprop engine lubricating oil pressure regulating system, comprising: a lubricating oil tank, a lubricating oil pump, a filter assembly, and an engine;

[0005] The output end of the lubricating oil tank, the lubricating oil pump, the filter assembly, the engine, the lubricating oil pump, and the lubricating oil tank are connected in sequence through pipelines;

[0006] The lubricating oil pump is connected to the filter assembly through a first pipeline;

[0007] A second pipeline is added in the middle of the first pipeline to connect to the lubricating oil tank;

[0008] A flow limiting component is installed on the second pipeline to regulate the flow of lubricating oil in the second pipeline.

[0009] Furthermore, the flow limiting component adopts an electric regulating valve, and the electric regulating valve is installed on the second pipeline.

[0010] Furthermore, it also includes a three-way joint, and the first pipeline includes a front section pipeline and a rear section pipeline;

[0011] One end of the front section pipeline is connected to the first outlet of the lubricating oil pump, and the other end of the front section pipeline is connected to the first interface of the three-way joint;

[0012] One end of the rear section pipeline is connected to the filter component input port, and the other end of the rear section pipeline is connected to the second interface of the three-way joint;

[0013] The third interface of the three-way connector is connected to one end of the second pipeline.

[0014] Furthermore, a one-way valve is installed on the front section pipeline.

[0015] Furthermore, a transition section is installed at the first inlet of the lubricating oil tank, and the second pipeline is connected to the first inlet of the lubricating oil tank through the transition section.

[0016] Furthermore, a magnetic plug is installed in the inner cavity of the engine, and the magnetic plug is arranged at a port where the engine is connected to the lubricating oil pump through a pipeline.

[0017] Furthermore, the filter assembly includes a water-cooled radiator and an oil filter assembly. The water-cooled radiator input port is connected to the first pipeline, the water-cooled radiator output port is connected to the oil filter assembly input port through the pipeline, and the oil filter assembly output port is connected to the engine oil inlet through the pipeline.

[0018] Furthermore, it also includes a chip end signaler, the inlet of the chip end signaler is connected to the second outlet end of the lubricating oil pump through a pipeline, and the outlet of the chip end signaler is connected to the second inlet of the lubricating oil tank through a pipeline.

[0019] The present invention also proposes a regulation method based on the above turboprop engine lubricating oil pressure regulation system, comprising the following steps:

[0020] Obtaining the lubricating oil output pressure at the first outlet of the lubricating oil pump;

[0021] Obtaining the lubricating oil pressure required for the engine test, and calculating the lubricating oil difference between the lubricating oil output pressure at the first outlet of the lubricating oil pump and the lubricating oil pressure required for the engine test;

[0022] The flow limiting component installed on the second pipeline is adjusted according to the lubricating oil difference until the lubricating oil pressure in the second pipeline is consistent with the lubricating oil difference.

[0023] Furthermore, it also includes:

[0024] The length and the aperture of the first pipeline are obtained, and the length and the aperture of the second pipeline and the connection position between the second pipeline and the first pipeline are determined according to the length and the aperture of the first pipeline.

[0025] The beneficial effects of the present invention are as follows:

[0026] The lubricating oil system and regulation method proposed in the present application add a lubricating oil bypass oil passage to the lubricating oil tank at the first outlet end of the lubricating oil pump by connecting pipelines in parallel, and divert the lubricating oil output by the lubricating oil pump through the lubricating oil bypass oil passage, thereby realizing the change of the lubricating oil pressure of the lubricating oil main oil passage. In the present application, an electric regulating valve is used to regulate the lubricating oil flow in the second pipeline to meet the test requirements of the variable engine lubricating oil pressure, thereby solving the technical problems that the lubricating oil pressure in the lubricating oil system is difficult to regulate in real time during the test and the lubricating oil pressure is inaccurate;

[0027] Correspondingly, the system has a simple structure and is easy to operate, avoiding changes to the internal pipelines of the lubricating oil tank and the engine pipelines, and reducing the difficulty and cost of modifying the sliding system.

[0028] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic diagram of a turboprop engine oil pressure regulating system according to an embodiment of the present invention is shown;

[0031] Figure 2 A flow chart of a method for regulating the oil pressure regulating system of a turboprop engine in an embodiment of the present invention is shown.

[0032] In the figure, 1. lubricating oil tank; 2. lubricating oil pump; 3. engine; 4. electric regulating valve; 5. non-return valve; 6. three-way joint; 7. adapter section; 8. magnetic plug; 9. first pipeline; 10. second pipeline; 11. water-cooled radiator; 12. oil filter assembly; 13. chip signaler. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The present invention provides a turboprop engine lubricating oil pressure regulating system and regulating method. Figure 1 A schematic diagram of a turboprop engine oil pressure regulating system in an embodiment of the present invention is shown. Figure 1 In the figure, the turboprop engine oil pressure regulating system includes an oil tank 1, an oil pump 2, a filter assembly, and an engine 3. The oil tank 1, the oil pump 2, the filter assembly, and the engine 3 together form an oil system.

[0035] The lubricating oil tank 1 has an output end, a first inlet and a second inlet, the lubricating oil pump 2 has a first inlet end, a second inlet end, a first outlet end and a second outlet end, the filter assembly has an input port and an output port, and the engine 3 has an oil inlet and an oil return port;

[0036] The output end of the lubricating oil tank 1 is connected to the first inlet end of the lubricating oil pump 2 through a pipeline;

[0037] The first outlet of the lubricating oil pump 2 is connected to the input port of the filter assembly through the first pipeline 9;

[0038] The output port of the filter assembly is connected to the fuel inlet port of the engine 3 through a pipeline;

[0039] The oil return port of the engine 3 passes through the second inlet end of the pipeline lubricating oil pump 2;

[0040] The second outlet end of the lubricating oil pump 2 is connected to the second inlet end of the lubricating oil tank 1 through a pipeline;

[0041] The first inlet of the lubricating oil tank 1 is connected to the first pipeline 9 through the second pipeline 10;

[0042] A flow limiting component is installed on the second pipeline 10 to regulate the flow of lubricating oil in the second pipeline 10 .

[0043] In the present application, the lubricating oil flows out from the lubricating oil tank 1, and flows through the lubricating oil pump 2, the filter assembly, and the engine 3 in sequence, and finally flows back to the lubricating oil pump 2 through the pipeline between the engine 3 and the second inlet end of the lubricating oil pump 2, and flows back to the lubricating oil tank 1 through the pipeline between the second outlet end of the lubricating oil pump 2 and the second inlet of the lubricating oil tank 1, forming a complete lubricating oil main oil circuit; in the present application, a first inlet is opened on the lubricating oil tank 1, and a second pipeline 10 connecting the first pipeline 9 and the first inlet of the lubricating oil tank 1 is added to the first pipeline 9 between the first inlet of the lubricating oil tank 1 and the filter assembly, so that the lubricating oil flowing out of the output end of the lubricating oil tank 1 flows back to the lubricating oil tank 1 after passing through the lubricating oil pump 2, the first pipeline 9, and the second pipeline 10, forming a complete lubricating oil bypass oil circuit.

[0044] It should be noted that the current lubricating oil system is conventionally provided with one oil inlet line and three oil return lines. If a pressure regulating valve is added to the internal pipeline of the existing lubricating oil system to adjust the lubricating oil pressure, it is necessary to modify the three return oil pipelines inside the engine 3, and add interfaces and pressure regulating equipment to the three pipelines respectively to achieve the purpose of accurate and comprehensive regulation. However, this will cause changes in the internal pipelines of the lubricating oil system, resulting in changes in the lubricating oil lubrication and heat dissipation status of the subsystems of the engine 3, and the modification difficulty, modification progress and modification cost of the engine 3 are relatively high.

[0045] The lubricating oil system proposed in the present application adds a lubricating oil bypass oil circuit entering the lubricating oil tank 1 at the first outlet end of the lubricating oil pump 2 by means of parallel pipelines, and the lubricating oil output by the lubricating oil pump 2 is diverted through the lubricating oil bypass oil circuit, thereby realizing the change of the lubricating oil pressure of the lubricating oil main oil circuit. In the present application, a flow limiting component is used to regulate the lubricating oil flow in the second pipeline 10 to meet the test requirements of the variable lubricating oil pressure of the engine 3, thereby solving the technical problems of the lubricating oil pressure in the lubricating oil system being difficult to adjust in real time during the test and the inaccurate lubricating oil pressure. Accordingly, the device has a simple structure and is easy to operate. Accordingly, the system has a simple structure and is easy to operate, avoiding changes to the internal pipelines of the lubricating oil tank 1 and the pipelines of the engine 3, and reducing the difficulty and cost of modifying the sliding system.

[0046] For the sake of convenience, the first pipeline 9 is divided into a front pipeline 91 and a rear pipeline 92 with the connection point between the second pipeline 10 and the first pipeline 9 as the boundary.

[0047] The above-mentioned flow limiting component adopts an electric regulating valve 4, which is installed on the second pipeline 10 and is used to regulate the lubricating oil flow in the second pipeline 10, thereby controlling the lubricating oil circuit pressure of the second pipeline 10 and the lubricating oil circuit pressure of the rear pipeline 92, and adjusting the lubricating oil pressure entering the filter component, realizing precise and real-time regulation, and further improving the flexibility of the lubricating oil system in the use of the present application.

[0048] During the test, the opening degree of the electric control valve 4 can be reduced to reduce the oil flow in the second pipeline 10 and increase the pressure of the rear pipeline 92 until the electric control valve 4 is completely closed. At this time, no oil flows in the second pipeline 10, and the pressure of the rear pipeline 92 increases to the maximum limit value. On the contrary, the opening degree of the electric control valve 4 can be increased to increase the oil flow in the second pipeline 10, reduce the oil flow in the rear pipeline 92, and reduce the pressure of the rear pipeline 92 until the electric control valve 4 is completely opened. At this time, the oil flow in the second pipeline 10 reaches the maximum value, and the pressure of the rear pipeline 92 is reduced to the minimum limit value of this lubricating oil system.

[0049] Specifically, it also includes a three-way connector 6, and the first pipeline 9 includes a front section pipeline 91 and a rear section pipeline 92;

[0050] One end of the front section pipeline 91 is connected to the first outlet of the lubricating oil pump 2, and the other end of the front section pipeline 91 is connected to the first interface of the three-way joint 6;

[0051] One end of the rear section pipeline 92 is connected to the filter component input port, and the other end of the rear section pipeline 92 is connected to the second interface of the three-way connector 6;

[0052] The third interface of the three-way connector 6 is connected to one end of the second pipeline 10 .

[0053] By adopting the three-way connector 6, the pipeline between the lubricating oil pump 2 and the filter assembly of the original lubricating oil system can be directly modified to connect the second pipeline 10, the front pipeline 91 and the rear pipeline 92, eliminating the process of replacing and installing the original pipeline and reducing the overall cost of the lubricating oil system; at the same time, it is convenient to replace the second pipeline 10 of different specifications according to needs in the later stage, thereby improving the applicability of the lubricating oil system and meeting the requirement of only modifying the external pipeline without affecting the efficiency of normal oil circuit work.

[0054] Correspondingly, a one-way valve 5 is installed on the front section pipeline 91 to close the pipeline from the connecting point between the second pipeline 10 and the first pipeline 9 to the direction of the lubricating oil tank 1, ensuring that the lubricating oil can flow out from the output end of the lubricating oil tank 1 to the first pipeline 9, and the lubricating oil in the front section pipeline 91 cannot directly flow back to the output end of the lubricating oil tank 1; to prevent the lubricating oil pump 2 from reducing its oil supply capacity during parking, causing the lubricating oil to flow back, resulting in excessive lubricating oil return, and further causing the engine 3 to smoke; at the same time, during the test, the lubricating oil pressure in the second pipeline 10 is adjusted by the electric regulating valve 4, which will cause the lubricating oil flow in the second pipeline 10 to fluctuate, and the sliding flow direction and fluctuation in the entire oil circuit are limited by the one-way valve 5, thereby improving the stability of the lubricating oil flow.

[0055] The currently commonly used lubricating oil tank 1 is an integrated one-piece casting, and the lubricating oil pipelines all enter and exit from the inside of the lubricating oil tank 1. No external pipeline interface is reserved, but the lubricating oil tank 1 has a mounting hole connected to the inner cavity of the lubricating oil tank 1, and a magnetic plug is detachably installed on the mounting hole. In order to ensure the integrity of the internal pipeline and reduce the structural changes to the lubricating oil tank 1, a transition section 7 is installed at the first inlet of the lubricating oil tank 1 corresponding to the structure of the magnetic plug mounting seat. The second pipeline 10 is connected to the first inlet of the lubricating oil tank 1 through the transition section 7, and the second pipeline 10 is connected to the mounting hole through the transition section 7, so that the second pipeline 10 is connected to the first inlet of the lubricating oil tank 1, so that the lubricating oil in the second pipeline 10 forms a complete circulation pipeline. The use of the transition section 7 instead of the magnetic plug avoids the structural modification of the lubricating oil tank 1, thereby improving the practicality of the system.

[0056] At the same time, in order to improve the cleaning of the lubricating oil in the lubricating oil system, a magnetic plug 8 is installed in the inner cavity of the engine 3. The magnetic plug 8 is set at the port where the engine 3 and the lubricating oil pump 2 are connected through a pipeline. It is used to intercept and collect metal debris in the lubricating oil in the return oil pipeline to prevent the debris in the lubricating oil from being brought into the lubricating oil tank 1.

[0057] In the present application, the filtering assembly includes a water-cooled radiator 11 and an oil filter assembly 12. The input port of the water-cooled radiator 11 is connected to the first pipeline 9, and the output port of the water-cooled radiator 11 is connected to the input port of the oil filter assembly 12 through a pipeline, which is used to control the temperature of the lubricating oil flowing from the first pipeline 9 so that the lubricating oil meets the operating temperature requirements of the subsequent engine 3, and then the lubricating oil is transported to the oil filter assembly 12, and the lubricating oil is filtered by the oil filter assembly 12. The output port of the oil filter assembly 12 is connected to the oil inlet of the engine 3 through a pipeline to ensure the impurity content of the lubricating oil entering the engine 3.

[0058] At the same time, in order to ensure that there will be no metal debris in the pipeline of the lubricating oil tank 1, a magnetic plug 8 is added to the return oil pipeline, and a chip end signaler 13 is also included. The inlet of the chip end signaler 13 is connected to the second outlet end of the lubricating oil pump 2 through a pipeline, and the outlet of the chip end signaler 13 is connected to the second inlet of the lubricating oil tank 1 through a pipeline, so as to monitor, intercept and collect metal debris in the main lubricating oil circuit.

[0059] refer to Figure 2 , Figure 2 The present invention also proposes a method for regulating the turboprop engine oil pressure regulating system based on the turboprop engine oil pressure regulating system, comprising:

[0060] Obtaining the lubricating oil output pressure at the first outlet of the lubricating oil pump 2;

[0061] Obtain the lubricating oil pressure required for the engine 3 test, and calculate the lubricating oil difference between the lubricating oil output pressure at the first outlet of the lubricating oil pump 2 and the lubricating oil pressure required for the engine 3 test;

[0062] The flow limiting component installed on the second pipeline 10 is adjusted according to the lubricating oil difference until the lubricating oil pressure in the second pipeline 10 is consistent with the lubricating oil difference.

[0063] During actual use, the lubricating oil output pressure at the first outlet end of the lubricating oil pump 2 and the lubricating oil pressure required for the engine 3 test can be directly obtained independently through the controller, and the current limiting component can be adjusted accordingly through the controller. On the basis of keeping the lubricating oil output pressure unchanged, the lubricating oil pressure in the second pipeline 10 and the lubricating oil pressure in the first pipeline 9 can change synchronously with the changes in the lubricating oil pressure required for the engine 3 test, thereby meeting the requirements for changes in the lubricating oil pressure required for the engine 3 test.

[0064] Among them, since the diameter and length of the pipeline will affect the pressure and flow of the parallel pipeline, it also includes:

[0065] The length and aperture of the first pipeline 9 are obtained, and the length and aperture of the second pipeline 10 and the connection position between the second pipeline 10 and the first pipeline 9 are determined according to the length and aperture of the first pipeline 9. In the preliminary design process of the system of the present application, the diversion effect of the lubricating oil in the first pipeline 9 can be achieved directly by changing the specifications of the second pipeline 10, thereby achieving a preliminary reduction in the lubricating oil flow and lubricating oil pressure in the first pipeline 9.

[0066] In actual use, the delivery amount of the lubricating oil tank 1 to the lubricating oil pump 2 can be set to a fixed value, and the amount of lubricating oil delivered by the output end of the lubricating oil pump 2 is also set to a fixed value.

[0067] The minimum and maximum lubricating oil pressure required for the test of the engine 3 are obtained. First, the lubricating oil pressure delivered by the output end of the lubricating oil pump 2 is adjusted to be greater than or equal to the maximum lubricating oil pressure required for the test of the engine 3; then, the length and aperture of the second pipeline 10 are determined according to the length and aperture of the first pipeline 9, so that when the flow limiting component regulates the lubricating oil flow in the second pipeline 10 to the maximum limit, the lubricating oil pressure delivered by the first pipeline 9 to the filter component is less than or equal to the minimum lubricating oil pressure required for the test of the engine 3. During the test of the engine 3, according to the real-time lubricating oil pressure required for the test, the flow limiting component is adjusted to change the lubricating oil flow in the second pipeline 10, and the lubricating oil flow in the second pipeline 10 is reduced by reducing the opening of the electric regulating valve 4, and the pressure of the first pipeline 9 is increased; on the contrary, the lubricating oil flow in the second pipeline 10 can be increased by increasing the opening of the electric regulating valve 4, and the lubricating oil flow in the first pipeline 9 can be reduced, and the pressure of the first pipeline 9 can be reduced; in the state of not stopping, the test requirements are met, and the lubricating oil pressure delivered to the engine 3 is adjusted in real time and synchronously.

[0068] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A turboprop engine oil pressure regulating system, comprising: Lubricating oil tank (1), lubricating oil pump (2), filter assembly, engine (3); The output end of the lubricating oil tank (1), the lubricating oil pump (2), the filter assembly, the engine (3), the lubricating oil pump (2), and the lubricating oil tank (1) are connected in sequence through pipelines; Features: The lubricating oil pump (2) is connected to the filter assembly via a first pipeline (9); A second pipeline (10) is added in the middle of the first pipeline (9) to connect with the lubricating oil tank (1); The second pipeline (10) is provided with a flow limiting component for regulating the flow rate of lubricating oil in the second pipeline (10).

2. The turboprop engine oil pressure regulating system according to claim 1, characterized in that: The flow limiting component adopts an electric regulating valve (4), and the electric regulating valve (4) is installed on the second pipeline (10).

3. The turboprop engine oil pressure regulating system according to claim 2, characterized in that: It also includes a three-way connector (6), wherein the first pipeline (9) includes a front section pipeline (91) and a rear section pipeline (92); One end of the front section pipeline (91) is connected to the first outlet of the lubricating oil pump (2), and the other end of the front section pipeline (91) is connected to the first interface of the three-way joint (6); One end of the rear section pipeline (92) is connected to the filter component input port, and the other end of the rear section pipeline (92) is connected to the second interface of the three-way connector (6); The third interface of the three-way connector (6) is connected to one end of the second pipeline (10).

4. The turboprop engine oil pressure regulating system according to claim 3, characterized in that: A one-way valve (5) is installed on the front section pipeline (91).

5. The turboprop engine oil pressure regulating system according to claim 2, characterized in that: A transition section (7) is installed at the first inlet of the lubricating oil tank (1), and the second pipeline (10) is connected to the first inlet of the lubricating oil tank (1) through the transition section (7).

6. The turboprop engine oil pressure regulating system according to claim 5, characterized in that: A magnetic plug (8) is installed in the inner cavity of the engine (3), and the magnetic plug (8) is arranged at a port where the engine (3) is connected to the lubricating oil pump (2) through a pipeline.

7. The turboprop engine oil pressure regulating system according to claim 1, characterized in that: The filter assembly comprises a water-cooled radiator (11) and an oil filter assembly (12); the water-cooled radiator (11) input port is connected to a first pipeline (9); the water-cooled radiator (11) output port is connected to the oil filter assembly (12) input port via a pipeline; and the oil filter assembly (12) output port is connected to an oil inlet of an engine (3) via a pipeline.

8. The turboprop engine oil pressure regulating system according to claim 1, characterized in that: It also includes a chip end signaler (13), the inlet of the chip end signaler (13) is connected to the second outlet end of the lubricating oil pump (2) through a pipeline, and the outlet of the chip end signaler (13) is connected to the second inlet of the lubricating oil tank (1) through a pipeline.

9. A method for regulating the turboprop engine oil pressure regulating system according to any one of claims 1 to 8, characterized in that: The following steps are involved: Obtaining the lubricating oil output pressure at a first outlet end of the lubricating oil pump (2); Obtaining the lubricating oil pressure required for testing the engine (3), and calculating the lubricating oil difference between the lubricating oil output pressure at the first outlet end of the lubricating oil pump (2) and the lubricating oil pressure required for testing the engine (3); The flow limiting component installed on the second pipeline (10) is adjusted according to the lubricating oil difference until the lubricating oil pressure in the second pipeline (10) is consistent with the lubricating oil difference.

10. The method for regulating the turboprop engine oil pressure regulating system according to claim 9, characterized in that: Also includes: The length and the aperture of the first pipeline (9) are obtained, and the length and the aperture of the second pipeline (10) and the connection position between the second pipeline (10) and the first pipeline (9) are determined according to the length and the aperture of the first pipeline (9).

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