Accessory casing swallowing volume test system and method

Abstract

The invention belongs to the field of engine tests, and particularly relates to an accessory casing swallowing volume test system and method, and the system comprises a metering adjustment unit, a lubricating oil unit, an oil return overflow unit, and a warmer. The metering adjusting unit comprises a metering oil tank and a liquid level sensor arranged in the metering oil tank; the lubricating oil unit comprises a first motor, an oil supply pump and a lubricating oil filter; the oil return overflow unit comprises a second motor, an accessory casing, an oil return pump and an overflow ventilation pipeline; the heater is connected between the metering oil tank and the oil return pump; the other end of the oil supply pump is connected with the lubricating oil filter; the first motor is connected to the oil supply pump. The lubricating oil filter is connected with the oil supply pump in series. One end of the accessory casing is connected with the lubricating oil filter, and the other end is connected with one end of the overflow ventilation pipeline; and the other end of the overflow ventilation pipeline is related to the metering oil tank. Actual working conditions such as engine accessory casing rotating speed, lubricating oil flow, lubricating oil temperature and oil return pressure are simulated by adjusting the motor rotating speed, the valve opening degree and the like.

Description

A test system and method for the volume of accessory housing swallowed Technical Field

[0001] This application belongs to the field of engine testing, and specifically relates to a test system and method for the volume of an accessory casing swallowed. Background Technology

[0002] The intake volume of an aircraft engine refers to the difference between the oil level in the oil tank when the engine speed is zero and the lubricating oil temperature is 15°C, and the oil level in the oil tank when the engine is stable at a specified speed. The intake volume primarily affects the amount of usable lubricating oil in the engine and the operational reliability of transmission components. When the intake volume is too large, the amount of usable lubricating oil in the oil tank will be reduced, failing to meet the requirements of normal flight operations. Simultaneously, the large amount of lubricating oil accumulating in the bearing cavity or accessory housing will be continuously agitated and heated, reducing the reliability of transmission components such as gears and bearings.

[0003] The lubricating oil ingested by the engine mainly concentrates in the bearing cavity, accessory housing, pipelines, and lubrication system accessories. Among these, the accessory housing of an aero-engine has a complex structure, with internal gears, bearings, and other transmission chains interacting with each other, resulting in a complex splashing state of the lubricating oil. This makes it difficult to calculate and assess the ingested volume under operating conditions. Therefore, it is necessary to conduct ingestion volume tests on the accessory housing to determine the actual ingestion state and ensure the normal operation of the system.

[0004] Currently, there is still a lack of testing systems and methods for the volume swallowed by accessory gearboxes. Existing aero-engine accessory gearbox testers can simulate basic operating conditions such as speed, oil supply and return, and heating, and are mainly used to verify the service life and reliability of accessory gearboxes.

[0005] The existing test system for aircraft engine accessory casings is shown in Figure 1.

[0006] This testing system is mainly used for verifying the operational reliability of accessory housings. However, it cannot measure the volume swallowed by the accessory housing during operation, and therefore has the following technical drawbacks:

[0007] 1. Simply adding a level measuring device to the oil tank of the existing test apparatus system cannot accurately measure the ingested volume. This is because many factors affect the oil tank level during the test, and the pipelines, heaters, oil filters, and other equipment in the test system will be filled with oil, affecting the measurement of the ingested volume of the accessory casing.

[0008] 2. Measuring the remaining oil in the accessory housing after normal shutdown cannot represent the intake volume. This is because during the test equipment shutdown process, the oil return pump is more powerful than the oil supply pump, and the lubricating oil inside the accessory housing will be gradually pumped away. Therefore, after complete shutdown, the remaining oil in the housing will be less than the actual intake volume of the housing in the working state, or even have no lubricating oil residue.

[0009] 3. Measuring the remaining oil in the accessory housing after an emergency stop during testing will damage the accessory housing and the testing equipment. In addition, the measurement results will be affected by the speed of the stop, which will also introduce certain errors.

[0010] Based on the existing accessory casing tester, the question is how to more accurately measure the swallow volume of the accessory casing swallow volume test system. Summary of the Invention

[0011] To address the aforementioned issues, this application provides an accessory housing swallowing volume testing system and method to resolve the problem of insufficient accuracy in swallowing volume in existing accessory housing swallowing volume testing systems.

[0012] The technical solution of this application is: an accessory casing swallowing volume test system, including a metering and adjustment unit, a lubricating oil unit, an oil return overflow unit and a heater;

[0013] The metering and regulating unit includes a metering oil tank and a liquid level sensor installed inside the metering oil tank;

[0014] The lubrication unit includes a first motor, an oil supply pump, and an oil filter;

[0015] The oil return overflow unit includes a second motor, an accessory housing, an oil return pump, and an overflow ventilation pipe;

[0016] The heater is connected between the metering oil tank and the return oil pump;

[0017] One end of the oil supply pump is connected to the metering oil tank and the other end is connected to the lubricating oil filter; the first motor is connected to the oil supply pump, and the lubricating oil filter is connected in series with the oil supply pump;

[0018] One end of the accessory housing is connected to the lubricating oil filter, and the other end is connected to one end of the overflow ventilation pipe; the other end of the overflow ventilation pipe is related to the metering oil tank;

[0019] Obtain the length and inner diameter of the overflow ventilation duct, and calculate and determine the intake volume of the accessory casing.

[0020] Preferably, a first regulating valve and a first lubricating oil flow meter are provided between the accessory housing and the metering oil tank. The first regulating valve is connected between the metering oil tank and the first motor, and the first lubricating oil flow meter is connected between the lubricating oil filter and the accessory housing.

[0021] Preferably, a second regulating valve and a second lubricating oil flow meter are provided between the heater and the metering oil tank. The second regulating valve and the second lubricating oil flow meter are connected in series, and a pressure sensor is provided between the second regulating valve and the second lubricating oil flow meter.

[0022] Another technical solution of this application is: a method for testing the volume of an accessory casing swallowed, comprising:

[0023] Open the first regulating valve and the second regulating valve, start and adjust the speed of the first motor and the second motor until the flow rate of the first lubricating oil flow meter is greater than the flow rate of the second lubricating oil flow meter, and control the heater to adjust the lubricating oil temperature to the set value;

[0024] After the liquid level in the metering tank stabilizes, record the first volume V1 of the oil in the metering tank.

[0025] Adjust the speed of the first motor and the second motor, and the opening of the second regulating valve to control the setting data of the oil supply pump, accessory housing and return pump to be the same as the test operating point;

[0026] After the liquid level in the metering tank stabilizes, record the second oil volume V2 in the metering tank.

[0027] Obtain the length and inner diameter of the overflow ventilation duct, and calculate the intake volume of the accessory casing by combining the first oil volume V1 and the second oil volume V2.

[0028] Preferably, the specific method for calculating and determining the intake volume of the accessory housing is as follows:

[0029] The volume Vg of the overflow ventilation duct is calculated by determining its length and inner diameter.

[0030] Establish a digital model of the accessory housing, and determine the volume Vf that the computer housing can hold for lubricating oil.

[0031] The volume of the accessory casing is calculated as follows: V = Vf - (V2 - V1 - Vg).

[0032] Preferably, the setting data for controlling the oil supply pump, accessory housing, and return pump are the same as those for the test operating point. Specifically, the oil supply pump lubricating oil flow rate is the same as that for the test operating point; the rotational speed and lubricating oil flow rate of the accessory housing are the same as those for the test operating point; and the return pump outlet pressure P is the same as that for the test operating point.

[0033] The attached test system and method for casing ingress volume in this application have the following advantages:

[0034] By adjusting the motor speed and valve opening, the actual working conditions such as engine accessory casing speed, lubricating oil flow, lubricating oil temperature, and return oil pressure are simulated.

[0035] By combining liquid level measurement and volume calculation, the swallowed volume data of the accessory casing is indirectly obtained, avoiding the problem of inaccurate swallowed volume measurement caused by directly measuring the volume difference of the metering tank and the swallowed volume of the test system's own pipeline. Attached Figure Description

[0036] Figure 1 is a schematic diagram of the accessory casing test system in the background art;

[0037] Figure 2 is a schematic diagram of the casing swallowing volume test system attached to this application.

[0038] 1. Metering oil tank; 2. Liquid level sensor; 3. First motor; 4. Oil supply pump; 5. Lubricating oil filter; 6. Second motor; 7. Accessory housing; 8. Return oil pump; 9. Overflow ventilation pipe; 10. Heater; 11. First regulating valve; 12. First lubricating oil flow meter; 13. Second regulating valve; 14. Second lubricating oil flow meter. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0040] The first aspect of this application provides an accessory casing swallowing volume test system, as shown in Figure 2, including a metering and adjustment unit, a lubricating oil unit, an oil return overflow unit, and a heater 10;

[0041] The metering and control unit includes a metering oil tank 1 and a liquid level sensor 2 installed inside the metering oil tank 1;

[0042] The lubrication unit includes a first motor 3, an oil supply pump 4, and an oil filter 5.

[0043] The oil return overflow unit includes a second motor 6, an accessory housing 7, an oil return pump 8, and an overflow ventilation pipe 9.

[0044] The heater 10 is connected between the metering oil tank 1 and the return oil pump 8.

[0045] One end of the oil supply pump 4 is connected to the metering oil tank 1 and the other end is connected to the lubricating oil filter 5; the first motor 3 is connected to the oil supply pump 4, and the lubricating oil filter 5 is connected in series with the oil supply pump 4.

[0046] One end of the accessory housing 7 is connected to the lubricating oil filter 5, and the other end is connected to one end of the overflow ventilation pipe 9; the other end of the overflow ventilation pipe 9 is related to the metering oil tank 1.

[0047] Obtain the length and inner diameter of the overflow ventilation duct 9, and calculate and determine the swallow volume of the accessory casing 7.

[0048] When the test system is working, the first motor 3 drives the oil supply pump 4 to supply the lubricating oil in the metering oil tank 1 into the system pipeline and the test piece in the accessory housing 7. Impurities are filtered through the lubricating oil filter 5, and the flow rate through the first lubricating oil flow meter 12 is adjusted by the speed of the first motor 3.

[0049] The second motor 6 drives the accessory housing 7 and its attached lubricating oil return pump 8 to simulate the test speed of the engine. The lubricating oil in the accessory housing 7 is drawn back to the metering oil tank 1 by the lubricating oil return pump 8 on the accessory housing 7, forming a dynamic circulation of oil.

[0050] The lubricating oil temperature level in the test system is adjusted by the heater 10. The outlet pressure of the lubricating oil return pump 8 is adjusted by the second regulating valve 13.

[0051] The real-time oil level in the metering tank 1 is recorded by the liquid level sensor 2 inside the metering tank 1 during the test.

[0052] During the test, when the lubricating oil fills the accessory housing 7 and the system pipelines, the overflow ventilation pipeline 9 acts as an overflow channel, allowing excess lubricating oil in the accessory housing 7 to return to the metering oil tank 1 through this pipeline. When the accessory housing 7 is in normal working condition, with an oil-air mixture inside, this pipeline acts as a ventilation channel, simulating the working conditions of a real engine accessory housing 7.

[0053] By setting up a metering and adjustment unit, the lubricating oil volume can be monitored in real time and accurately during the test, providing continuous and reliable basic oil volume data for the calculation of the intake volume. This replaces the traditional ordinary lubricating oil tank, solves the problem that the original oil tank has no accurate metering capability, and establishes the core hardware foundation for intake volume measurement.

[0054] The lubricating oil unit, the oil return overflow unit, and the heater 10 form a closed-loop lubricating oil circulation system, which can simulate the lubricating oil supply, return, and temperature conditions of the engine accessory housing 7. At the same time, the overflow ventilation pipe 9 has both overflow and ventilation functions: when the lubricating oil is full, it realizes overflow return; when the lubricating oil is normal, it realizes ventilation, accurately restoring the actual working environment of the engine accessory housing 7 and ensuring the authenticity of the test conditions.

[0055] Preferably, a first regulating valve 11 and a first lubricating oil flow meter 12 are provided between the accessory housing 7 and the metering oil tank 1. The first regulating valve 11 is connected between the metering oil tank 1 and the first motor 3, and the first lubricating oil flow meter 12 is connected between the lubricating oil filter 5 and the accessory housing 7.

[0056] The first lubricating oil flow meter 12 can intuitively display the oil supply flow data. In conjunction with the first regulating valve 11 to adjust the oil circuit opening, it can quickly and accurately adjust the oil supply flow to the set value of the engine test operating point, ensuring the consistency between the oil supply flow and the actual engine operating conditions.

[0057] Preferably, a second regulating valve 13 and a second lubricating oil flow meter 14 are provided between the heater 10 and the metering oil tank 1. The second regulating valve 13 and the second lubricating oil flow meter 14 are connected in series, and a pressure sensor is provided between the second regulating valve 13 and the second lubricating oil flow meter 14.

[0058] The second lubricating oil flow meter 14 monitors the return oil flow in real time and, together with the second regulating valve 13, precisely adjusts the return oil flow to the set value of the test operating point to ensure the accuracy of the return oil flow.

[0059] The second aspect of this application provides a method for testing the volume of the accessory casing 7 that is swallowed, comprising the following steps:

[0060] Step 1: Open the first regulating valve 11 and the second regulating valve 13, start and adjust the speed of the first motor 3 and the second motor 6 until the flow rate of the first lubricating oil flow meter 12 is greater than the flow rate of the second lubricating oil flow meter 14, and control the heater 10 to adjust the lubricating oil temperature to the set value.

[0061] Step 2: After the liquid level in the metering tank 1 stabilizes, record the first oil volume V1 in the metering tank 1.

[0062] Step 3: Adjust the speed of the first motor 3 and the second motor 6 and the opening of the second regulating valve 13, and control the setting data of the oil supply pump 4, accessory housing 7 and return pump 8 to be the same as the test operating point.

[0063] Step 4: After the liquid level in the metering tank 1 stabilizes, record the second oil volume V2 in the metering tank 1.

[0064] Step 5: Obtain the length and inner diameter of the overflow ventilation pipe 9, and calculate and determine the swallowing volume of the accessory casing 7 by combining the first oil volume V1 and the second oil volume V2.

[0065] By first increasing the flow rate of the first lubricating oil flow meter 12 and stabilizing the oil temperature, the pipeline and accessory casing 7 of the test system are filled with oil, thus establishing a unified and accurate initial benchmark for the volume measurement and avoiding measurement errors caused by insufficient oil filling in the initial state.

[0066] By capturing the changes in oil volume in the accessory housing 7 under full oil conditions and actual working conditions, and combining the parameters of the overflow ventilation pipe 9, the swallowing volume is calculated. The entire process is completed under normal working conditions of the test system without the need for emergency stop, thus avoiding mechanical damage to the accessory housing 7 and the test equipment caused by emergency stop, ensuring the integrity and service life of the test equipment, and eliminating measurement errors caused by the speed of emergency stop.

[0067] Preferably, the specific method for calculating and determining the swallowing volume of the accessory casing 7 is as follows:

[0068] The volume Vg of the overflow ventilation duct 9 is calculated by determining its length and inner diameter.

[0069] Establish a digital model of accessory housing 7, and determine the volume Vf that the computer housing can hold for lubricating oil;

[0070] The volume of the accessory casing 7 is calculated as: V = Vf - (V2 - V1 - Vg).

[0071] By incorporating the overflow ventilation duct 9 volume Vg and the accessory housing 7 total volume Vf into the calculation system, and through precise volume correction, the interference of non-accessory housing 7 factors such as overflow ventilation duct 9 and lubricating oil filling in the test system on the measurement results is completely eliminated, thus solving the core problem of data distortion caused by the failure to consider the system pipeline volume in traditional measurement methods.

[0072] Preferably, the setting data of the control oil supply pump 4, accessory housing 7 and return oil pump 8 are the same as those of the test operating point. Specifically, the lubricating oil flow rate of the oil supply pump 4 is the same as that of the test operating point; the rotational speed and lubricating oil flow rate of the accessory housing 7 are the same as those of the test operating point; and the outlet pressure P of the return oil pump 8 is the same as that of the test operating point.

[0073] The core matching parameters for the test operating conditions were clearly defined as the oil supply pump lubricating oil flow rate, accessory housing speed and lubricating oil flow rate, and return oil pump outlet pressure. This gave the adjustment of test parameters a clear and specific target, avoiding parameter omissions or deviations during the operating condition matching process, and ensuring that the test system could fully and accurately reproduce the actual working parameters of the engine accessory housing.

[0074] In summary, this application has the following advantages:

[0075] By adjusting the motor speed and valve opening, the actual working conditions such as engine accessory casing speed, lubricating oil flow, lubricating oil temperature, and return oil pressure are simulated.

[0076] By combining liquid level measurement and volume calculation, the swallowed volume data of the accessory casing is indirectly obtained, avoiding the problem of inaccurate swallowed volume measurement caused by directly measuring the volume difference of the metering tank and the swallowed volume of the test system's own pipeline.

[0077] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A test system for the volume of an accessory housing swallowed, characterized in that, It includes a metering and regulating unit, a lubricating oil unit, a return oil overflow unit, and a heater (10); the metering and regulating unit includes a metering oil tank (1) and a level sensor (2) installed in the metering oil tank (1); the lubricating oil unit includes a first motor (3), an oil supply pump (4), and an oil filter (5); the return oil overflow unit includes a second motor (6), an accessory housing (7), a return oil pump (8), and an overflow ventilation pipe (9); the heater (10) is connected between the metering oil tank (1) and the return oil pump (8); the oil supply... One end of the oil pump (4) is connected to the metering oil tank (1), and the other end is connected to the lubricating oil filter (5); the first motor (3) is connected to the oil supply pump (4), and the lubricating oil filter (5) is connected in series with the oil supply pump (4); one end of the accessory housing (7) is connected to the lubricating oil filter (5), and the other end is connected to one end of the overflow ventilation pipe (9); the other end of the overflow ventilation pipe (9) is related to the metering oil tank (1); the length and inner diameter of the overflow ventilation pipe (9) are obtained, and the swallowing volume of the accessory housing (7) is calculated and determined.

2. The accessory housing swallowing volume test system as described in claim 1, characterized in that, A first regulating valve (11) and a first lubricating oil flow meter (12) are provided between the accessory housing (7) and the metering oil tank (1). The first regulating valve (11) is connected between the metering oil tank (1) and the first motor (3), and the first lubricating oil flow meter (12) is connected between the lubricating oil filter (5) and the accessory housing (7).

3. The accessory housing swallowing volume test system as described in claim 1, characterized in that, A second regulating valve (13) and a second lubricating oil flow meter (14) are provided between the heater (10) and the metering oil tank (1). The second regulating valve (13) and the second lubricating oil flow meter (14) are connected in series, and a pressure sensor is provided between the second regulating valve (13) and the second lubricating oil flow meter (14).

4. A method for testing the volume of an accessory housing swallowed, employing the system described in any one of claims 1-3, characterized in that, include: Open the first regulating valve (11) and the second regulating valve (13), start and adjust the speed of the first motor (3) and the second motor (6) until the flow rate of the first lubricating oil flow meter (12) is greater than the flow rate of the second lubricating oil flow meter (14), and control the heater (10) to adjust the lubricating oil temperature to the set value; after the liquid level in the metering oil tank (1) stabilizes, record the first oil volume V1 in the metering oil tank (1); adjust the speed of the first motor (3), the second motor (6) and the opening of the second regulating valve (13), and control the setting data of the oil supply pump (4), accessory housing (7) and return oil pump (8) to be the same as the test working point; after the liquid level in the metering oil tank (1) stabilizes, record the second oil volume V2 in the metering oil tank (1); obtain the length and inner diameter of the overflow ventilation pipe (9), and calculate and determine the swallowing volume of the accessory housing (7) in combination with the first oil volume V1 and the second oil volume V2.

5. The method for testing the volume of the accessory housing as described in claim 4, characterized in that, The specific method for calculating and determining the intake volume of the accessory housing (7) is as follows: by determining the length and inner diameter of the overflow ventilation pipe (9), calculate the pipe volume Vg; establish a digital model of the accessory housing (7) and calculate the volume Vf that the housing can hold lubricating oil; calculate the intake volume of the accessory housing (7) as: V=Vf-(V2-V1-Vg).

6. The method for testing the volume of the accessory housing as described in claim 4, characterized in that, The setting data of the control oil supply pump (4), accessory housing (7) and return oil pump (8) are the same as the test operating point. Specifically, the lubricating oil flow rate of the oil supply pump (4) is the same as the test operating point; the rotational speed and lubricating oil flow rate of the accessory housing (7) are the same as the test operating point; and the outlet pressure P of the return oil pump (8) is the same as the test operating point.

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