Lubricating oil dynamic test device and method for lubricating oil pump of aero-engine

Abstract

The invention discloses a lubricating oil dynamic test device and method for an aero-engine lubricating oil pump, and the device enables the return oil of a booster stage of the lubricating oil pump to be uniformly distributed to a plurality of oil return stages through a small flow divider, thereby enabling the return oil of the booster stage to be the oil inlet of the oil return stages, and enabling the booster stage and the oil return stages to form a closed circulation oil supply and return system. A throttle valve and an oil storage container are respectively arranged on each first oil return stage oil inlet pipeline, inlet oil in each oil return stage oil inlet pipeline is temporarily stored in the oil storage container and then pumped away by each oil return stage, and if the oil quantity in the oil storage container is balanced in the test process, namely the oil coming from the booster stage can be completely and evenly taken away by the oil return stage, the oil return stage can be stopped. And the lubricating oil pump has no overload and underload conditions, so that the matching performance of the booster stage and the oil return stage can be judged to be good, otherwise, the matching performance of the booster stage and the oil return stage is judged to be poor.

Description

Technical Field

[0001] The present invention relates to the technical field of lubricating oil pump testing, and in particular to a lubricating oil dynamic testing device for an aircraft engine lubricating oil pump, and in addition, in particular to a lubricating oil dynamic testing method using the lubricating oil dynamic testing device. Background Art

[0002] The aircraft engine oil pump supplies oil through the engine's own oil tank, which is used to lubricate and cool the engine's high-speed bearings. At the same time, the oil from each lubrication point is collected and pumped back to the tank, working in a closed cycle. The oil pump is an important component of the aircraft engine, generally composed of a boost stage and an oil return stage. Specifically, Figures 1 to 3 As shown, the lubricating oil pump includes a supercharging stage oil inlet 100, a supercharging stage oil return 200, a first oil return stage oil inlet 300, a second oil return stage oil inlet 400, a third oil return stage oil inlet 500, a fourth oil return stage oil inlet 600, a fifth oil return stage oil inlet 700, a sixth oil return stage oil inlet 800 and a return stage total oil return 900, wherein the first three return stages share one return oil, the fourth return stage and the fifth return stage share one return oil, the sixth return stage has a single return oil, the supercharging stage has a single return oil, and the return stage total oil return 900 collects the three return oils into one total return oil. Each lubricating oil passage of the supercharging stage and the return oil stage is meshed by a matching gear, and is rotated by the engine transmission mechanism to realize the circulation of the lubricating oil. In order to ensure the normal operation of the lubricating oil pump, each lubricating oil pump leaving the factory needs to be tested separately before the whole aircraft engine is assembled, including the running-in test and performance test of the lubricating oil pump. The running-in test is to ensure that the meshing gears of the new pump are accurately matched and burrs are removed, while the performance test is to ensure that the inlet and return oil flow of the new pump meets the requirements under various pressure, temperature and speed requirements. The performance test specifically includes sealing test, ground flow characteristic test, high-altitude characteristic test and life test. The lubricating oil pump can be installed on the aircraft engine only after passing the above tests and meeting the technical requirements to ensure the safety of the engine ground test and installation flight test.

[0003] However, the existing lubricating oil pump test device is only suitable for conventional performance tests, and it is not possible to test and verify the matching performance between the boost stage and the oil return stage of the lubricating oil pump. Figure 4As shown in the figure, when conducting the sealing test, ground flow characteristic test and high altitude characteristic test, the boost stage and oil return stage of the lubricating oil pump both take oil from the vacuum high-level oil tank. After the lubricating oil enters the boost stage and oil return stage of the lubricating oil pump respectively, it is respectively transported back to the high-level oil tank through the oil return port, thereby completing the test process; when conducting the life test, the lubricating oil is provided by the low-level oil tank, and the oil pump is used to lubricate and cool the connecting shaft. At the same time, the low-level oil tank is also used to collect residual oil when the lubricating oil pump is disassembled and assembled. Therefore, the existing lubricating oil pump test device can only realize the separate performance test of the boost stage and the oil return stage, but cannot test the matching performance between the boost stage and the oil return stage of the lubricating oil pump. Summary of the invention

[0004] The invention provides a lubricating oil dynamic test device and method for an aircraft engine lubricating oil pump, which can test and verify the matching performance between a boosting stage and an oil return stage of the lubricating oil pump.

[0005] According to one aspect of the present invention, a lubricating oil dynamic test device for an aircraft engine lubricating oil pump is provided, comprising a vacuum high-level oil tank, a small flow divider, a throttle valve and an oil storage container, wherein the boosting stage of the lubricating oil pump is connected to the vacuum high-level oil tank via a boosting stage oil inlet pipeline, and is also connected to the small flow divider via a boosting stage oil return pipeline, the small flow divider is respectively connected to each oil return stage of the lubricating oil pump via a first return oil stage oil inlet pipeline, each oil return stage of the lubricating oil pump is also connected to the vacuum high-level oil tank via a total return oil pipeline of the return oil stage, a throttle valve and an oil storage container are sequentially arranged on each first return oil stage oil inlet pipeline, the small flow divider is used for evenly distributing the return oil of the boosting stage to a plurality of return oil stages, the throttle valve is used for adjusting the oil inlet flow of the return oil stage, the oil storage container is used for temporarily storing the inlet oil of the return oil stage, and during the test, whether the boosting stage and the return oil stage match is judged based on whether the oil inflow and outflow in the oil storage container are balanced.

[0006] Furthermore, the oil storage container is a measuring cup with a scale, and whether the oil inflow and oil extraction of the measuring cup are balanced is judged by observing the change of the liquid level in the measuring cup. If there is no overflow or emptying of the measuring cup, it is determined that the performance of the boost stage and the oil return stage match.

[0007] Furthermore, a low liquid level sensor and a high liquid level sensor are provided in the oil storage container. When neither the low liquid level sensor nor the high liquid level sensor sends an alarm signal, it is determined that the performance of the boost stage and the oil return stage match; otherwise, it is determined that the performance of the boost stage and the oil return stage do not match.

[0008] Furthermore, a liquid level detection element is provided in the oil storage container. When the liquid level detection element detects that the liquid level change amplitude in the oil storage container does not exceed a preset threshold, it is determined that the performance of the boost stage and the oil return stage match; otherwise, it is determined that the performance of the boost stage and the oil return stage do not match.

[0009] Furthermore, the boost stage return oil pipeline of the lubricating oil pump is respectively connected to the small diverter and the vacuum high-level oil tank through the first solenoid valve, and each oil return stage of the lubricating oil pump is also respectively connected to the vacuum high-level oil tank through the second oil return stage oil inlet pipeline, and the second oil return stage oil inlet pipeline is connected to the first oil return stage oil inlet pipeline through the second solenoid valve. The first solenoid valve and the second solenoid valve are used to control the oil circuit switching. By controlling the switching state of the first solenoid valve and the second solenoid valve, the switching between the conventional performance test and the lubricating oil dynamic test can be realized.

[0010] Furthermore, it also includes a refrigeration unit and a low-level oil tank. The vacuum high-level oil tank and the low-level oil tank form a circulation with the refrigeration unit respectively, so as to reduce the oil temperature by heat exchange with the refrigeration unit after the test.

[0011] Furthermore, it also includes a lubricating oil pump sleeve, an oil pump sleeve seat, a coupling, a high-speed spindle motor and a motor seat. The lubricating oil pump is installed in the lubricating oil pump sleeve by clearance fit, the lubricating oil pump sleeve is fixedly installed on the oil pump sleeve seat, the oil pump sleeve seat and the motor seat are fixedly installed on the test bench, the high-speed spindle motor is fixedly installed on the motor seat, the lubricating oil pump driving end extends out along the center hole of the oil pump sleeve seat and is connected to the high-speed spindle motor through a coupling, the center hole of the oil pump sleeve seat is coaxially arranged with the rotation center of the high-speed spindle motor, an oil hole is opened on the lubricating oil pump sleeve at a position corresponding to the oil channel of the lubricating oil pump, and a threaded pipe joint is welded at the oil hole, which is connected to the hydraulic system pipe through a hose.

[0012] Furthermore, the lubricating oil pump sleeve and the lubricating oil pump are made of the same material.

[0013] Furthermore, the lubricating oil pump sleeve is also provided with an oil pump ejection screw and an oil pump mounting screw.

[0014] In addition, the present invention also provides a lubricating oil dynamic test method for an aircraft engine lubricating oil pump, using the lubricating oil dynamic test device as described above, comprising the following contents:

[0015] Install the lubricating oil pump on the lubricating oil dynamic test device, connect the oil inlet and return pipelines of the lubricating oil pump, and heat the oil temperature of the vacuum high-level oil tank to meet the test temperature requirements;

[0016] Adjust the oil pump motor speed according to the test requirements;

[0017] During the test, whether the boost stage and the oil return stage match is determined by whether the oil inflow and outflow in the oil storage container are balanced.

[0018] The present invention has the following beneficial effects:

[0019] The lubricating oil dynamic test device of the aircraft engine lubricating oil pump of the present invention distributes the return oil of the boosting stage of the lubricating oil pump to multiple oil return stages evenly through a small diverter, so that the return oil of the boosting stage is the inlet oil of the oil return stage, and the boosting stage and the oil return stage form a closed-loop oil supply and return system, and a throttle valve and an oil storage container are respectively arranged on each first oil return stage oil inlet pipeline, and the inlet oil in the oil inlet pipeline of each oil return stage is first temporarily stored in the oil storage container and then drawn away by each oil return stage. During the test, if the oil inflow and outflow in the oil storage container are balanced, that is, the oil from the boosting stage can be completely and evenly taken away by the oil return stage, and there is no overload or underload in the lubricating oil pump, it can be determined that the matching performance of the boosting stage and the oil return stage is excellent, otherwise it can be determined that the matching performance of the boosting stage and the oil return stage is poor.

[0020] In addition, the lubricating oil dynamic test method of the aircraft engine lubricating oil pump of the present invention also has the above advantages.

[0021] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 It is a structural diagram of the lubricating oil pump.

[0024] Figure 2 This is a schematic diagram of the structure of the lubricating oil pump from another angle.

[0025] Figure 3 This is a schematic diagram of the working principle of the lubricating oil pump.

[0026] Figure 4 It is a schematic diagram of the hydraulic principle of an existing test device for an aircraft engine lubricating oil pump.

[0027] Figure 5 It is a schematic diagram of the hydraulic principle of a lubricating oil dynamic test device for an aircraft engine lubricating oil pump according to a preferred embodiment of the present invention.

[0028] Figure 6 It is another hydraulic principle schematic diagram of the lubricating oil dynamic test device of the aircraft engine lubricating oil pump according to the preferred embodiment of the present invention.

[0029] Figure 7 It is a front cross-sectional schematic diagram of the lubricating oil pump installation structure of the lubricating oil dynamic test device of the aircraft engine lubricating oil pump according to the preferred embodiment of the present invention.

[0030] Figure 8It is a side view schematic diagram of the lubricating oil pump installation structure of the lubricating oil dynamic test device of the aircraft engine lubricating oil pump according to the preferred embodiment of the present invention.

[0031] Fig. 9 It is a schematic diagram of the three-dimensional structure of the lubricating oil pump sleeve of the preferred embodiment of the present invention when the threaded pipe joint is not installed.

[0032] Fig.10 It is a schematic diagram of the dimension design of the lubricating oil pump sleeve of the preferred embodiment of the present invention when the threaded pipe joint is not installed.

[0033] Fig.11 It is a schematic diagram of the three-dimensional structure of the lubricating oil pump sleeve of the preferred embodiment of the present invention when a threaded pipe joint is installed.

[0034] Fig.12 It is a schematic diagram of the dimension design of the threaded pipe joint corresponding to the total oil return in the preferred embodiment of the present invention.

[0035] Fig.13 It is a schematic diagram of the size design of the threaded pipe joint corresponding to the oil inlet and return in the preferred embodiment of the present invention.

[0036] Fig.14 It is a flow chart of a method for dynamic testing lubricating oil of an aircraft engine lubricating oil pump according to another embodiment of the present invention.

[0037] Description of Reference Numerals

[0038] 100, oil inlet to the boost stage; 200, oil return to the boost stage; 300, oil inlet to the first oil return stage; 400, oil inlet to the second oil return stage; 500, oil inlet to the third oil return stage; 600, oil inlet to the fourth oil return stage; 700, oil inlet to the fifth oil return stage; 800, oil inlet to the sixth oil return stage; 900, total oil return to the oil return stage; 1. Vacuum high-level oil tank; 2. Small diverter; 3. Throttle valve; 4. Oil storage container; 5. First solenoid valve; 6. Second solenoid valve; 7. Refrigeration unit; 8. Low-level oil tank; 9. Lubricating oil pump sleeve; 10. Oil pump sleeve seat; 11. Coupling; 12. High-speed spindle motor; 13. Motor seat; 14. Oil pump ejector screw; 15. Oil pump mounting screw; 16. Threaded pipe joint. DETAILED DESCRIPTION

[0039] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0040] Reference Figure 5The preferred embodiment of the present application provides a lubricating oil dynamic test device for an aircraft engine lubricating oil pump, comprising a vacuum high-position oil tank 1, a small flow divider 2, a throttle valve 3 and an oil storage container 4. The boosting stage of the lubricating oil pump is connected to the vacuum high-position oil tank 1 through a boosting stage oil inlet pipeline, and is also connected to the small flow divider 2 through a boosting stage oil return pipeline. The small flow divider 2 is respectively connected to each oil return stage of the lubricating oil pump through a first oil return stage oil inlet pipeline, and each oil return stage of the lubricating oil pump is also connected to the total oil return pipeline of the oil return stage. The vacuum high-level oil tank 1 is connected, and a throttle valve 3 and an oil storage container 4 are sequentially arranged on each first oil return stage oil inlet pipeline. The small diverter 2 is used to evenly distribute the return oil of the boost stage to multiple oil return stages. The throttle valve 3 is used to adjust the oil inlet flow of the oil return stage, wherein the throttle nozzle diameter size of the throttle valve 3 is determined by simulation calculation. The oil storage container 4 is used to temporarily store the inlet oil of the oil return stage. During the test, whether the boost stage and the oil return stage match is judged based on whether the oil inflow and outflow in the oil storage container 4 is balanced.

[0041] It can be understood that when the lubricating oil dynamic test is carried out, the boosting stage of the lubricating oil pump takes oil from the vacuum high-level oil tank 1. After the lubricating oil is pressurized by the boosting stage, it does not return to the vacuum high-level oil tank 1, but is evenly distributed to multiple oil return stages through the small diverter 2. The oil inlet flow of each oil return stage can be adjusted by the throttle valve 3. The oil inlet of each oil return stage is first temporarily stored in the oil storage container 4 and then pumped away by the oil return stage. During the lubricating oil dynamic test, the opening of the throttle valve 3 is adjusted to the maximum, and the incoming oil and the pumped oil in the oil storage container 4 on each first oil return stage oil inlet pipeline are observed to be balanced. If not, the simulation data of the throttle nozzle needs to be adjusted to optimize the throttle aperture, so that the oil volume in the oil storage container 4 can be kept balanced in all states of the engine without overflow and emptying. The lubricating oil temporarily stored in the oil storage container 4 is pumped away by the gears of the oil return stages of the lubricating oil pump at various levels and merged into a total oil return of the oil return stage, and finally flows back to the vacuum high-level oil tank 1, thereby completing the lubricating oil dynamic test. Among them, the standard throttle aperture verified by the standard sample pump can provide accurate data for the subsequent mass production of accessory throttle valves for lubricating oil pumps.

[0042] It can be understood that the lubricating oil dynamic test device of the aircraft engine lubricating oil pump of the present embodiment distributes the return oil of the boosting stage of the lubricating oil pump to multiple oil return stages evenly through the small diverter 2, so that the return oil of the boosting stage is the inlet oil of the oil return stage, and the boosting stage and the oil return stage form a closed-loop oil supply and return system. A throttle valve 3 and an oil storage container 4 are respectively arranged on each first oil return stage oil inlet pipeline, and the inlet oil in the oil inlet pipeline of each oil return stage is first temporarily stored in the oil storage container 4 and then drawn away by each oil return stage. During the test, if the oil inlet and outlet of the oil storage container 4 are balanced, that is, the oil from the boosting stage can be completely and evenly taken away by the oil return stage, there is no overload or underload in the lubricating oil pump, and it can be determined that the matching performance of the boosting stage and the oil return stage is excellent, otherwise it can be determined that the matching performance of the boosting stage and the oil return stage is poor.

[0043] Optionally, the oil storage container 4 is a measuring cup with a scale, and the balance of oil inflow and oil extraction of the measuring cup can be judged by manually observing the change of the liquid level in the measuring cup. If there is no overflow or emptying of the measuring cup, it is determined that the performance of the boost stage and the oil return stage match.

[0044] As another option, the oil storage container 4 is provided with a low liquid level sensor and a high liquid level sensor. When no alarm signal is issued by the low liquid level sensor and the high liquid level sensor, that is, no low liquid level alarm and high liquid level alarm appear during the sliding dynamic test, it is determined that the performance of the boosting stage and the oil return stage match, otherwise it is determined that the performance of the boosting stage and the oil return stage do not match. It can be understood that automatic monitoring of the low liquid level and the high liquid level is achieved by providing the low liquid level sensor and the high liquid level sensor in the oil storage container 4. At this time, the oil storage container 4 can be any type of container.

[0045] In addition, a liquid level detection element is provided in the oil storage container 4. When the liquid level detection element detects that the liquid level change amplitude in the oil storage container 4 does not exceed a preset threshold value, it is determined that the performance of the boosting stage and the oil return stage match, otherwise it is determined that the performance of the boosting stage and the oil return stage do not match. It can be understood that by providing a liquid level detection element in the oil storage container 4 to monitor the liquid level change amplitude in the oil storage container 4 in real time, the performance of the boosting stage and the oil return stage is determined to match only when the liquid level change amplitude is within a preset range, so that the oil balance in the oil storage container 4 can be more accurately monitored.

[0046] In addition, if Figure 6 As shown, the boosting stage oil return pipeline of the lubricating oil pump is connected to the small diverter 2 and the vacuum high-level oil tank 1 respectively through the first solenoid valve 5, and each oil return stage of the lubricating oil pump is also connected to the vacuum high-level oil tank 1 through the second oil return stage oil inlet pipeline, and the second oil return stage oil inlet pipeline is connected to the first oil return stage oil inlet pipeline through the second solenoid valve 6. The first solenoid valve 5 and the second solenoid valve 6 are used to control the oil circuit switching. By controlling the switching state of the first solenoid valve 5 and the second solenoid valve 6, the switching between the conventional performance test and the lubricating oil dynamic test can be realized. It can be understood that when the first solenoid valve 5 is controlled to conduct the boosting stage oil return pipeline and the small diverter 2, and the second solenoid valve 6 is controlled to conduct the first oil return stage oil inlet pipeline and each oil return stage, the lubricating oil dynamic test can be carried out, and when the first solenoid valve 5 is controlled to conduct the boosting stage oil return pipeline and the vacuum high-level oil tank 1, and the second solenoid valve 6 is controlled to conduct the second oil return stage oil inlet pipeline and each oil return stage, the conventional performance test can be carried out. The first solenoid valve 5 and the second solenoid valve 6 can both be electromagnetic reversing valves. It can be understood that by setting the first solenoid valve 5 and the second solenoid valve 6 to switch the oil circuit, the lubricating oil dynamic test device can perform both lubricating oil dynamic tests and conventional performance tests, thereby improving the integration level of the lubricating oil dynamic test device.

[0047] In addition, the boost stage oil inlet pipeline is provided with oil filters, flow meters, pressure sensors, temperature sensors and other components, the second return oil stage oil inlet pipeline is provided with oil filters, booster pumps, diverters, flow meters, pressure regulating valves, solenoid valves, pressure sensors and other components, and the boost stage oil return pipeline is provided with pressure regulating valves, pressure sensors, flow meters, oil filters and other components. Among them, the specific designs of the boost stage oil inlet pipeline, the second return oil stage oil inlet pipeline, the boost stage oil return pipeline and the return oil stage total oil return pipeline belong to the prior art and will not be repeated here.

[0048] In addition, the lubricating oil dynamic test device also includes a refrigeration unit 7 and a low-level oil tank 8. The vacuum high-level oil tank 1 and the low-level oil tank 8 form a cycle with the refrigeration unit 7 respectively. After the test is completed, the vacuum high-level oil tank 1 and the low-level oil tank 8 can reduce the oil temperature by heat exchange with the refrigeration unit 7, so as to facilitate the disassembly of the test pump. In addition, the vacuum high-level oil tank 1 is provided with an electric heating device, a liquid level sensor, a temperature control device, etc. The electric heating device is used to heat the lubricating oil. The temperature control device controls the start and stop of the electric heating device through a temperature closed loop to achieve automatic control of the oil temperature in the lubricating oil tank and over-temperature limit. The liquid level sensor is used for liquid level monitoring. In addition, the lubricating oil dynamic test device is also equipped with a vacuum pump to facilitate the vacuum high-level oil tank 1 to evacuate air to meet the system oil inlet negative pressure requirements.

[0049] It is understandable that Figure 7 and Figure 8 As shown, the lubricating oil dynamic test device also includes a lubricating oil pump sleeve 9, an oil pump sleeve seat 10, a coupling 11, a high-speed spindle motor 12 and a motor seat 13. The lubricating oil pump is installed in the lubricating oil pump sleeve 9 through clearance fit, the lubricating oil pump sleeve 9 is fixedly installed on the oil pump sleeve seat 10, the oil pump sleeve seat 10 and the motor seat 13 are fixedly installed on the test bench, and the high-speed spindle motor 12 is fixedly installed on the motor seat 13. The driving end of the lubricating oil pump extends out along the center hole of the oil pump sleeve seat 10 and is connected to the high-speed spindle motor 12 through the coupling 11, wherein one end of the coupling 11 is connected to the lubricating oil pump through a spline, and the other end is connected to the high-speed spindle motor 12 through a thread, and the threaded connection is tightened by a large thread glue, the center hole of the oil pump sleeve seat 10 is coaxially arranged with the rotation center of the high-speed spindle motor 12, and the high-speed spindle motor 12 serves as a power driving source to provide a rotation speed that meets the requirements of the lubricating oil pump test.

[0050] It is understandable that Figures 9 to 11As shown, the inner hole φ40.6 on the oil pump sleeve 9 matches the outer circle clearance of the oil pump, and the clearance between the two is between 0.1mm and 1mm. The clearance is very small, which can ensure that there is no oil leakage between the oil holes on the oil pump sleeve 9, and will not affect the flow rate during the test, thereby affecting the accuracy of the test results. The φ60 stop on the oil pump sleeve 9 serves as the installation reference of the oil pump, ensuring the coaxiality requirements of the oil pump and the high-speed spindle motor 12. In addition, during the processing of the inner hole φ40.6, a high ovality and coaxiality with the installation stop must be ensured to ensure that there is no vibration and noise when the oil pump rotates at high speed.

[0051] It can be understood that an oil hole is opened on the lubricating oil pump sleeve 9 at a position corresponding to the oil channel of the lubricating oil pump, and a threaded pipe joint 16 is welded at the oil hole, which is connected to the hydraulic system pipe through a hose. Due to the use of an external pipe design, it is ensured that when testing the lubricating oil pump, only the lubricating oil pump needs to be installed and disassembled, and there is no need to install and disassemble the connecting pipeline. It is very convenient to use and easy to maintain.

[0052] In addition, the lubricating oil pump sleeve 9 and the lubricating oil pump are made of the same material, for example, both are made of aluminum alloy, to avoid different thermal expansion coefficients caused by different materials during high and low temperature tests of the lubricating oil pump, which may lead to internal oil leakage and the lubricating oil pump and the lubricating oil pump sleeve 9 biting each other.

[0053] In addition, since the fitting clearance between the lubricating oil pump and the lubricating oil pump sleeve 9 is very small, which makes it difficult to assemble and disassemble the lubricating oil pump, the lubricating oil pump sleeve 9 is also provided with an oil pump ejector screw 14 and an oil pump mounting screw 15 to facilitate the assembly and disassembly of the lubricating oil pump and improve the assembly and disassembly efficiency of the lubricating oil pump.

[0054] In addition, considering the cylindrical structure of the lubricating oil pump and the irregular opening of the oil passage hole, the threaded pipe joint 16 adopts a fully covered arc-surface square structure, such as Fig.12 As shown, the lower inner cavity of the threaded pipe joint 16 corresponding to the total oil return covers three oil return ports, and the upper surface is milled flat to facilitate thread processing, such as Fig.13 As shown, the lower inner cavity of the oil inlet and return threaded pipe joint 16 covers a single oil inlet and return port, and the upper surface is milled flat. It can be understood that the threaded pipe joint 16 adopts a fully covered arc surface square structure to ensure no throttling and facilitate thread processing.

[0055] In addition, if Fig.14 As shown, the present invention also provides a lubricating oil dynamic test method for an aircraft engine lubricating oil pump, preferably using the lubricating oil dynamic test device as described above, including the following contents:

[0056] Step S1: Install the lubricating oil pump on the lubricating oil dynamic test device, connect the oil inlet and return pipelines of the lubricating oil pump, and heat the oil temperature of the vacuum high-level oil tank to meet the test temperature requirements;

[0057] Step S2: adjusting the oil pump motor speed according to the test requirements;

[0058] Step S3: During the test, whether the boosting level and the oil return level match is determined based on whether the oil inflow and outflow in the oil storage container are balanced.

[0059] It can be understood that the lubricating oil dynamic test method of the present embodiment is to first install the lubricating oil pump on the lubricating oil dynamic test device, connect the oil inlet and return pipes of the lubricating oil pump, and heat the oil temperature of the vacuum high-level oil tank to meet the test temperature requirement, and then adjust the oil pump motor speed according to the test requirements, thereby adjusting the speed of the lubricating oil pump. During the test, whether the boost stage and the oil return stage are matched is judged based on whether the oil inflow and outflow in the oil storage container are balanced. If the oil inflow and outflow in the oil storage container are balanced, that is, the oil from the boost stage can be completely and evenly taken away by the oil return stage, and there is no overload or underload in the lubricating oil pump, it can be judged that the matching performance of the boost stage and the oil return stage is excellent. Otherwise, it is judged that the matching performance of the boost stage and the oil return stage is poor.

[0060] Specifically, when conducting the lubricating oil dynamic test, increase the pump speed to 6500±20rpm, adjust the return oil discharge pressure valve to obtain an oil return discharge pressure of 482.3±68.9kPa, check whether each oil pool is circulating, and do not allow the oil storage container to overflow; then reduce the pump speed to 1000±20rpm, check whether each oil pool is circulating, and record the return oil discharge pressure, and do not allow the oil storage container to overflow; and repeat the above steps at the speeds of 3000±20, 5000±20, and 6500±20rpm; thereby, a low idle overflow inspection test and an idle to full speed overflow inspection test can be achieved.

[0061] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0062] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lubricating oil dynamic test device for an aircraft engine lubricating oil pump, characterized in that: The invention comprises a vacuum high-position oil tank (1), a small flow divider (2), a throttle valve (3) and an oil storage container (4); the boosting stage of the lubricating oil pump is connected to the vacuum high-position oil tank (1) through the boosting stage oil inlet pipeline, and is also connected to the small flow divider (2) through the boosting stage oil return pipeline; the small flow divider (2) is respectively connected to each oil return stage of the lubricating oil pump through the first oil return stage oil inlet pipeline; each oil return stage of the lubricating oil pump is also connected to the vacuum high-position oil tank (1) through the oil return stage total oil return pipeline; each first oil return stage oil inlet pipeline is sequentially provided with a throttle valve (3) and an oil storage container (4); the small flow divider (2) is used to evenly distribute the return oil of the boosting stage to a plurality of oil return stages; the throttle valve (3) is used to adjust the oil inlet flow rate of the oil return stage; the oil storage container (4) is used to temporarily store the oil inlet of the oil return stage; during the test, whether the boosting stage and the oil return stage match is determined based on whether the oil inflow and outflow in the oil storage container (4) are balanced.

2. The lubricating oil dynamic test device for an aircraft engine lubricating oil pump according to claim 1, characterized in that: The oil storage container (4) is a measuring cup with a scale. By observing the change in the liquid level in the measuring cup, it is judged whether the oil inflow and oil extraction of the measuring cup are balanced. If there is no overflow or emptying of the measuring cup, it is judged that the performance of the boosting stage and the oil return stage are matched.

3. The lubricating oil dynamic test device for an aircraft engine lubricating oil pump according to claim 1, characterized in that: The oil storage container (4) is provided with a low liquid level sensor and a high liquid level sensor. When neither the low liquid level sensor nor the high liquid level sensor sends an alarm signal, it is determined that the performance of the boosting stage and the oil return stage match; otherwise, it is determined that the performance of the boosting stage and the oil return stage do not match.

4. The lubricating oil dynamic test device for an aircraft engine lubricating oil pump according to claim 1, characterized in that: A liquid level detection element is provided in the oil storage container (4). When the liquid level detection element detects that the liquid level change amplitude in the oil storage container (4) does not exceed a preset threshold value, it is determined that the performance of the boosting stage and the oil return stage match; otherwise, it is determined that the performance of the boosting stage and the oil return stage do not match.

5. The lubricating oil dynamic test device for an aircraft engine lubricating oil pump according to claim 1, characterized in that: The boost stage oil return pipeline of the lubricating oil pump is respectively connected to the small flow divider (2) and the vacuum high-level oil tank (1) through the first solenoid valve (5); each oil return stage of the lubricating oil pump is also respectively connected to the vacuum high-level oil tank (1) through the second oil return stage oil inlet pipeline, and the second oil return stage oil inlet pipeline is connected to the first oil return stage oil inlet pipeline through the second solenoid valve (6); the first solenoid valve (5) and the second solenoid valve (6) are used to control oil circuit switching; by controlling the switching state of the first solenoid valve (5) and the second solenoid valve (6), switching between conventional performance testing and lubricating oil dynamic testing can be achieved.

6. The lubricating oil dynamic test device for an aircraft engine lubricating oil pump according to claim 5, characterized in that: It also includes a refrigeration unit (7) and a low-level oil tank (8). The vacuum high-level oil tank (1) and the low-level oil tank (8) are respectively circulated with the refrigeration unit (7) so as to reduce the oil temperature by heat exchange with the refrigeration unit (7) after the test.

7. The lubricating oil dynamic test device for an aircraft engine lubricating oil pump according to claim 1, characterized in that: The invention also comprises a lubricating oil pump sleeve (9), an oil pump sleeve seat (10), a coupling (11), a high-speed spindle motor (12) and a motor seat (13); the lubricating oil pump is installed in the lubricating oil pump sleeve (9) through clearance fit; the lubricating oil pump sleeve (9) is fixedly installed on the oil pump sleeve seat (10); the oil pump sleeve seat (10) and the motor seat (13) are fixedly installed on a test bench; the high-speed spindle motor (12) is fixedly installed on the motor seat (13); the driving end of the lubricating oil pump extends out along the center hole of the oil pump sleeve seat (10) and is connected to the high-speed spindle motor (12) through the coupling (11); the center hole of the oil pump sleeve seat (10) is coaxially arranged with the rotation center of the high-speed spindle motor (12); an oil hole is provided on the lubricating oil pump sleeve (9) at a position corresponding to the oil passage of the lubricating oil pump; a threaded pipe joint is welded at the oil hole and connected to the hydraulic system pipe joint through a hose.

8. The lubricating oil dynamic test device for an aircraft engine lubricating oil pump according to claim 7, characterized in that: The lubricating oil pump sleeve (9) and the lubricating oil pump are made of the same material.

9. The lubricating oil dynamic test device for an aircraft engine lubricating oil pump according to claim 7, characterized in that: The lubricating oil pump sleeve (9) is also provided with an oil pump ejection screw (14) and an oil pump mounting screw (15).

10. A method for dynamic testing of lubricating oil of an aircraft engine lubricating oil pump, using the lubricating oil dynamic testing device as claimed in any one of claims 1 to 9, characterized in that: Includes the following: Install the lubricating oil pump on the lubricating oil dynamic test device, connect the oil inlet and return pipelines of the lubricating oil pump, and heat the oil temperature of the vacuum high-level oil tank to meet the test temperature requirements; Adjust the oil pump motor speed according to the test requirements; During the test, whether the boost stage and the oil return stage match is determined by whether the oil inflow and outflow in the oil storage container are balanced.

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