Validation device and method for high-altitude low-rotating-speed test of lubricating oil pump

Abstract

The invention belongs to the field of aviation lubricating oil pump design, and relates to a high-altitude low-rotating-speed test verification device and method for a lubricating oil pump. Comprising a motor, a lubricating oil pump, a first oil tank, a second oil tank, a first pressure adjusting device, a second pressure adjusting device, a first valve, a second valve, a flowmeter, a temperature sensor and a pressure sensor. Valves, flow meters, sensors, pressure adjusting devices and the like of corresponding loops are arranged on different pump stages of the lubricating oil pump to monitor an oil tank; the high-altitude low-rotation-speed test can be carried out on the lubricating oil pump, the related performance does not need to be verified after the lubricating oil pump is assembled to the engine, whether the lubricating oil pump cannot achieve the expected function performance or not can be found in time, and engine test or work failure caused by the fact that the lubricating oil pump cannot adapt to the whole machine working condition after being assembled to the engine is avoided.

Description

Technical Field

[0001] The invention belongs to the field of aviation lubricating oil pump design, and relates to a high-altitude and low-speed test verification device and method for a lubricating oil pump. Background Art

[0002] The lubricating oil pump is a commonly used accessory for aircraft engines. Its main functions include two aspects: one is to extract the lubricating oil from the engine oil pool and supply it to various lubrication parts of the engine after pressurization; the other is to pump the lubricating oil back from various cavities of the engine, re-combining them inside and then re-inputting them into the engine oil pool.

[0003] With the development of the aviation industry, the working conditions of lubricating oil pumps are becoming more and more demanding, and the assessment test items are becoming more and more in line with the actual working conditions of the products. High altitude and low speed refers to the low speed operating state of aircraft under high altitude operation. Through the high altitude and low speed test of lubricating oil pumps, it is verified whether the lubricating oil pump has insufficient oil return capacity under high altitude and low speed working conditions, and whether it can meet the flow performance index requirements of the engine under high altitude and low speed conditions, providing analysis and evaluation basis for the design, structural improvement and troubleshooting of aircraft engine lubricating oil systems.

[0004] Therefore, a new verification and assessment test item is proposed for aviation lubricating oil pumps: high-altitude and low-speed test of lubricating oil pumps. Currently, there is no ground test bench device that can carry out high-altitude and low-speed test of lubricating oil pumps. Summary of the invention

[0005] Purpose of the Invention

[0006] A ground test bench device for high-altitude and low-speed testing of a lubricating oil pump is provided, which can carry out high-altitude and low-speed testing on the lubricating oil pump. It is not necessary to verify the relevant performance after the lubricating oil pump is assembled to the engine. It can promptly discover whether the lubricating oil pump has problems in achieving the expected functional performance, so as to avoid engine test or work failure due to the lubricating oil pump being unable to adapt to the overall machine working conditions after being assembled to the engine.

[0007] Technical Solution

[0008] A high altitude low speed test verification device for a lubricating oil pump, comprising a motor, a lubricating oil pump, a first oil tank, a second oil tank, a first pressure regulating device, a second pressure regulating device, a first valve, a second valve, a flow meter, a temperature sensor, and a pressure sensor;

[0009] The motor is connected to the lubricating oil pump, one end of the upper pump stage I of the lubricating oil pump is connected in sequence to a pressure sensor, a flow meter, a first valve- and one end of the second oil tank-, a temperature sensor is provided below the liquid level in the second oil tank-, and a second pressure regulating device- is provided above the liquid level in the second oil tank-; the other end of the second oil tank- is connected in sequence to a second flow meter, a second pressure sensor and returns to the other end of the pump stage I,

[0010] One end of the pump stage II on the lubricating oil pump is connected in sequence to the third pressure sensor, the third flow meter, the second valve - and one end of the first oil tank -, a second temperature sensor is provided below the liquid level in the first oil tank -, and a first pressure regulating device - is provided above the liquid level in the first oil tank -; the other end of the first oil tank - is connected in sequence to the fourth flow meter, the fourth pressure sensor and returns to the other end of the pump stage II.

[0011] Furthermore, a high altitude low speed test verification method for a lubricating oil pump using the device comprises the following steps:

[0012] Step 1

[0013] Before the test begins, use a motor to drive the lubricating oil pump to run at the rated speed n1, adjust the first oil tank and the second oil tank corresponding to the first pressure regulating device and the second pressure regulating device, so that the inlet pressure of the lubricating oil pump stage I and stage II is the inlet pressure P1 under the rated working condition, adjust the first valve and the second valve so that the outlet pressure of the lubricating oil pump stage I and stage II is the inlet pressure P2 under the rated working condition, use the flow sensor, temperature sensor and pressure sensor to record the actual value of each test parameter after the test system reaches the steady state, and keep the running time t1 under the test state;

[0014] Step 2

[0015] Solidify the equivalent nozzle state of the tester, that is, keep the opening of the first valve and the second valve unchanged;

[0016] Step 3

[0017] According to the high-altitude and low-speed working condition 1 given by the engine, adjust the motor-driven lubricating oil pump so that its operating speed reaches n2, adjust the corresponding pressure regulating devices of the first oil tank and the second oil tank so that the inlet pressure of the lubricating oil pump stage I and stage II is the specified inlet pressure P2 of the engine, use the flow sensor, temperature sensor and pressure sensor to record the actual values ​​of each test parameter after this test system reaches a steady state, and maintain the running time t2 under this test state.

[0018] Furthermore, if it is necessary to explore the actual performance of the oil pump under the given high altitude and low speed condition 2 of the engine, repeat step 3.

[0019] Furthermore, in step 2, if the engine has other specific provisions on the equivalent nozzle specifications, the equivalent nozzle of the tester is adjusted according to the specific operating conditions specified by the engine.

[0020] Furthermore, the adjustment method refers to the above steps 1 to 3.

[0021] Furthermore, during the test, the lubricating oil pump should be able to operate normally and should not have abnormal conditions such as oil leakage and vibration.

[0022] Furthermore, in step 3, different from the normal working condition, the lubricating oil pump inlet pressure in this working condition is substantially the same as that in the normal working condition, and the speed of the lubricating oil pump is relatively low.

[0023] Furthermore, a lubricating oil pump adopts the high-altitude and low-speed test verification method.

[0024] The beneficial effects of this application are:

[0025] By using a ground test bench device for high-altitude and low-speed testing of a lubricating oil pump provided by the present invention, the lubricating oil pump can be evaluated more fully and comprehensively, the safety and reliability of subsequent use of the lubricating oil pump can be improved, and the failure of engine testing or operation caused by the problematic lubricating oil pump being assembled to the engine can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The invention relates to a ground bench device for high altitude and low speed testing of a lubricating oil pump.

[0027] In the figure:

[0028] 1—motor; 2—lubricating oil pump; 3—pipeline; 4-1—first oil tank, 4-2—second oil tank; 5-1—first pressure regulating device, 5-2—second pressure regulating device; 6-1—first valve, 6-2—second valve; 7—flow meter; 8—temperature sensor; 9—pressure sensor DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the implementation of the present invention clearer, the technical scheme in the embodiment of the present invention will be described in more detail in combination with the embodiment of the present invention. In the example, the same or similar reference numerals throughout represent the same or similar originals or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of them. The embodiments described below by reference are exemplary and intended to be used to explain the present invention, and should not be construed as limitations on the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present invention. The following is a detailed description in combination with the embodiments of the present invention.

[0030] Now an aviation lubricating oil pump is used Figure 1 The test device shown in the figure implements the high altitude low speed test process for further explanation:

[0031] Step 1: Before the test begins, use motor 1 to drive the lubricating oil pump 2 to run at rated speed n1, adjust the corresponding pressure regulating devices 5-1 and 5-2 of the first oil tank 4-1 and the second oil tank 4-2 so that the inlet pressure of the lubricating oil pump stage I and stage II is the inlet pressure P1 under rated working conditions, adjust the first valve 6-1 and the second valve 6-2 so that the outlet pressure of the lubricating oil pump stage I and stage II is the inlet pressure P2 under rated working conditions, use flow sensor 7, temperature sensor 8 and pressure sensor 9 to record the actual values ​​of each test parameter after the test system reaches steady state, and keep the running time t1 under this test state.

[0032] Step 2: Solidify the state of the tester equivalent nozzle, that is, keep the opening of the first valve 6-1 and the second valve 6-2 unchanged (if the engine has other specific regulations on the equivalent nozzle specifications, the tester equivalent nozzle is adjusted according to the specific working conditions specified by the engine. The adjustment method can refer to the above process adjustment).

[0033] Step 3: According to the high-altitude and low-speed working condition 1 given by the engine (different from the normal working condition, the lubricating oil pump inlet pressure under this working condition is basically the same as that under the normal working condition, but the speed of the lubricating oil pump is lower), adjust the motor 1 to drive the lubricating oil pump so that its operating speed reaches n2, adjust the corresponding pressure regulating devices of the first oil tank 4-1 and the second oil tank 4-2 so that the inlet pressure of the lubricating oil pump stage I and stage II is the specified inlet pressure P2 of the engine, use the flow sensor 7, temperature sensor 8 and pressure sensor 9 to record the actual values ​​of each test parameter after this test system reaches a steady state, and maintain the running time t2 under this test state.

[0034] Step 4: d) If you need to find out the actual performance of the lubricating oil pump under the given high altitude and low speed condition 2 (different from the normal condition, the lubricating oil pump inlet pressure under this condition is basically the same as that under the normal condition, but the speed of the lubricating oil pump is lower), repeat step c).

[0035] Example

[0036] A high altitude and low speed test verification device for a lubricating oil pump comprises a motor 1, a lubricating oil pump 2, a first oil tank 4-1, a second oil tank 4-2, a first pressure regulating device 5-1, a second pressure regulating device 5-2, a first valve 6-1, a second valve 6-2, a flow meter 7, a temperature sensor 8, and a pressure sensor 9;

[0037] The motor 1 is connected to the lubricating oil pump 2. One end of the pump stage I of the lubricating oil pump 2 is connected in sequence to a pressure sensor 9, a flow meter 7, a first valve 6-1 and one end of a second oil tank 4-2. A temperature sensor 8 is provided below the liquid level in the second oil tank 4-2. A second pressure regulating device 5-2 is provided above the liquid level in the second oil tank 4-2. The other end of the second oil tank 4-2 is connected in sequence to a second flow meter 7, a second pressure sensor 9 and returns to the other end of the pump stage I.

[0038] One end of the pump stage II on the lubricating oil pump 2 is connected in sequence to the third pressure sensor 9, the third flow meter 7, the second valve 6-2 and one end of the first oil tank 4-1, a second temperature sensor 8 is provided below the liquid level in the first oil tank 4-1, and a first pressure regulating device 5-1 is provided above the liquid level of the first oil tank 4-1; the other end of the first oil tank 4-1 is connected in sequence to the fourth flow meter 7, the fourth pressure sensor 9 and returned to the other end of the pump stage II.

[0039] A high altitude low speed test verification method for a lubricating oil pump comprises the following steps:

[0040] Step 1

[0041] Before the test begins, use motor 1 to drive the lubricating oil pump 2 to run at rated speed n1, adjust the corresponding pressure regulating devices 5-1 and 5-2 of the first oil tank 4-1 and the second oil tank 4-2 so that the inlet pressure of the lubricating oil pump stage I and stage II is the inlet pressure P1 under rated working conditions, adjust the first valve 6-1 and the second valve 6-2 so that the outlet pressure of the lubricating oil pump stage I and stage II is the inlet pressure P2 under rated working conditions, use flow sensor 7, temperature sensor 8 and pressure sensor 9 to record the actual values ​​of each test parameter after the test system reaches steady state, and maintain the running time t1 under this test state.

[0042] Step 2

[0043] The equivalent nozzle state of the tester is solidified, that is, the openings of the first valve 6-1 and the second valve 6-2 are kept unchanged.

[0044] Step 3

[0045] According to the high-altitude and low-speed operating condition 1 given by the engine, adjust the motor 1 to drive the lubricating oil pump so that its operating speed reaches n2, adjust the corresponding pressure regulating devices of the first oil tank 4-1 and the second oil tank 4-2 so that the inlet pressure of the lubricating oil pump stage I and stage II is the specified inlet pressure P2 of the engine, use the flow sensor 7, temperature sensor 8 and pressure sensor 9 to record the actual values ​​of each test parameter after this test system reaches a steady state, and maintain the running time t2 under this test state.

[0046] In a certain implementation case of the present invention, if it is necessary to explore the actual performance of the oil pump under the given high-altitude and low-speed working condition 2 of the engine, repeat step 3.

[0047] In a certain implementation case of the present invention, in step 2, if the engine has other specific provisions on the equivalent nozzle specifications, the equivalent nozzle of the tester is adjusted according to the specific operating conditions specified by the engine.

[0048] In a certain implementation case of the present invention, the adjustment method refers to the adjustment process of steps 1 to 3 above.

[0049] In a certain implementation case of the present invention, the lubricating oil pump should be able to work normally during the test, and no abnormal conditions such as oil leakage and vibration should occur.

[0050] In a certain implementation case of the present invention, in step 3, different from the normal working condition, the lubricating oil pump inlet pressure in this working condition is basically the same as that in the normal working condition, but the speed of the lubricating oil pump is lower.

[0051] In a certain implementation case of the present invention, a lubricating oil pump adopts a high-altitude and low-speed test verification method.

[0052] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of this application shall be the common meanings understood by the general technicians in the field to which this application belongs. The words "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inside", "outside" and other words indicating orientation used in the description of this application are only used to indicate the relative direction or positional relationship, and do not imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. When the absolute position of the described object changes, its relative positional relationship may also change accordingly, so it cannot be understood as a limitation on this application. The "first", "second", "third" and similar terms used in the description of this application are only used for descriptive purposes to distinguish different components, and cannot be understood as indicating or implying relative importance. The similar words "one", "one" or "the" used in the description of this application should not be understood as an absolute limitation on quantity, but should be understood as the existence of at least one. The similar words "including" or "comprising" used in the description of this application mean that the elements or objects appearing in front of the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0053] In addition, it should be noted that, unless otherwise clearly specified and limited, the words "installed", "connected", "connected" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection 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, an indirect connection through an intermediate medium, or the internal connection of two components. Technical personnel in the field can understand their specific meanings in this application according to the specific circumstances.

[0054] The above description is only a specific implementation mode of the present invention and is not intended to limit the present invention. Within the spirit and principle of the present invention, any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the technical solution content of the present invention, any modification, equivalent replacement, improvement, etc. made should be included in the protection scope of the present invention.

Claims

1. A high altitude and low speed test verification device for a lubricating oil pump, characterized in that: It includes a motor, a lubricating oil pump, a first oil tank, a second oil tank, a first pressure regulating device, a second pressure regulating device, a first valve, a second valve, a flow meter, a temperature sensor, and a pressure sensor; The motor is connected to the lubricating oil pump, one end of the upper pump stage I of the lubricating oil pump is connected in sequence to a pressure sensor, a flow meter, a first valve- and one end of the second oil tank-, a temperature sensor is provided below the liquid level in the second oil tank-, and a second pressure regulating device- is provided above the liquid level in the second oil tank-; the other end of the second oil tank- is connected in sequence to a second flow meter, a second pressure sensor and returns to the other end of the pump stage I, One end of the pump stage II on the lubricating oil pump is connected in sequence to the third pressure sensor, the third flow meter, the second valve - and one end of the first oil tank -, a second temperature sensor is provided below the liquid level in the first oil tank -, and a first pressure regulating device - is provided above the liquid level in the first oil tank -; the other end of the first oil tank - is connected in sequence to the fourth flow meter, the fourth pressure sensor and returns to the other end of the pump stage II.

2. A high altitude low speed test verification method for a lubricating oil pump using the device as claimed in claim 1: characterized in that: The steps include: Step 1 Before the test begins, use a motor to drive the lubricating oil pump to run at the rated speed n1, adjust the first oil tank and the second oil tank corresponding to the first pressure regulating device and the second pressure regulating device, so that the inlet pressure of the lubricating oil pump stage I and stage II is the inlet pressure P1 under the rated working condition, adjust the first valve and the second valve so that the outlet pressure of the lubricating oil pump stage I and stage II is the inlet pressure P2 under the rated working condition, use the flow sensor, temperature sensor and pressure sensor to record the actual value of each test parameter after the test system reaches the steady state, and keep the running time t1 under the test state; Step 2 Solidify the equivalent nozzle state of the tester, that is, keep the opening of the first valve and the second valve unchanged; Step 3 According to the high-altitude and low-speed working condition 1 given by the engine, adjust the motor-driven lubricating oil pump so that its operating speed reaches n2, adjust the corresponding pressure regulating devices of the first oil tank and the second oil tank so that the inlet pressure of the lubricating oil pump stage I and stage II is the specified inlet pressure P2 of the engine, use the flow sensor, temperature sensor and pressure sensor to record the actual values ​​of each test parameter after this test system reaches a steady state, and maintain the running time t2 under this test state.

3. The method according to claim 2, characterized in that: If you need to find out the actual performance of the oil pump under the given high altitude and low speed condition 2 of the engine, repeat step 3.

4. The method according to claim 3, characterized in that: In step 2, if the engine has other specific provisions for the equivalent nozzle specifications, the equivalent nozzle of the tester is adjusted according to the specific operating conditions specified by the engine.

5. The method according to claim 4, characterized in that: For the adjustment method, refer to the above steps 1 to 3.

6. The method according to claim 5, characterized in that: During the test, the lubricating oil pump should be able to operate normally and should not have abnormal conditions such as oil leakage and vibration.

7. The method according to claim 6, characterized in that: In step 3, different from the normal working condition, the lubricating oil pump inlet pressure in this working condition is substantially the same as that in the normal working condition, and the speed of the lubricating oil pump is relatively low.

8. A lubricating oil pump using the high altitude and low speed test verification method as claimed in claim 2.

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