Air entraining test assembly and air entraining device for test thereof

Abstract

The invention discloses an air-entraining test assembly and an air-entraining device for testing, which are used for improving the accuracy of air-entraining test. The air entraining device for testing is used for an aero-engine and comprises an air entraining pipe, an annular pipe, a plurality of intermediate pipes and a plurality of testing pipes. The air entraining pipe is used for entraining air from a casing of the aero-engine; the annular pipe surrounds the air entraining pipe, and the air entraining pipe is located in the center of the annular pipe; the multiple intermediate pipes are evenly distributed in the circumferential direction, and each intermediate pipe is connected with the annular pipe and the air guiding pipe in a bridging mode. And a plurality of test tubes, wherein each test tube is used for communicating the annular tube with the outside.

Description

Technical Field

[0001] The present invention relates to the technical field of aero-engine testing, and particularly relates to an air extraction testing assembly and an air extraction device for testing thereof. Background Art

[0002] The main flow path of an aero-engine consists of an air inlet duct, a compressor, a combustion chamber, a turbine, a nozzle, etc. The atmosphere enters the flow path of the engine through the air inlet duct, is compressed by the compressor, ignited in the combustion chamber, and then the high-temperature and high-pressure gas does work on the turbine, and finally is discharged into the atmosphere through the nozzle. Accessories are arranged outside the aero-engine, and pipelines for transporting fuel, lubricating oil, and air medium are provided.

[0003] The air extraction of an aero-engine includes two types: one is to extract gas with specified temperature and pressure from one interface of the casing to another interface for aircraft air supply or bearing chamber sealing, and the other is to test the gas pressure in a certain area of the engine. The air extraction pipeline for aircraft air supply or bearing chamber sealing usually adopts an air extraction pipeline with a flow diameter of more than 30 mm, while the air extraction pipeline for testing usually adopts an air extraction pipeline with a flow diameter of less than 10 mm.

[0004] Figure 1 A schematic block diagram of the existing test air extraction is shown. 90 is the air flow direction. The air extraction pipeline 91 extracts air at a specific position 93 of the aero-engine 92 and guides the gas to the position of the sensor 94, and parameters such as the pressure or temperature of the gas are recorded through the sensor 94. Figure 2 A three-dimensional structure of the existing air extraction device is shown. Figure 3 A sectional structure of the existing air extraction device is shown. The air extraction pipeline 91 is arranged on the casing 95 and extracts air from inside the casing 95 to the outside. However, the gas pressures extracted by multiple air extraction pipelines 91 located at the same cross-section but different circumferential positions are different, which affects the accuracy of the test values. Summary of the Invention

[0005] The purpose of the present invention is to provide an air extraction testing assembly and an air extraction device for testing thereof, which are used to improve the accuracy of air extraction testing.

[0006] In a first aspect, the present invention provides an air extraction device for testing. According to an embodiment of the present invention, the air extraction device for testing is used for an aero-engine. The air extraction device for testing includes an air extraction pipeline, an annular pipeline, a plurality of intermediate pipelines, and a plurality of test pipelines; the air extraction pipeline is used to extract air from the casing of the aero-engine; the annular pipeline surrounds the air extraction pipeline, and the air extraction pipeline is located at the center of the annular pipeline; the plurality of intermediate pipelines are circumferentially distributed uniformly, and each intermediate pipeline bridges the annular pipeline and the air extraction pipeline; the plurality of test pipelines, and each test pipeline communicates the annular pipeline with the outside.

[0007] In one or more embodiments, the plurality of test pipelines are circumferentially distributed uniformly.

[0008] In one or more embodiments, the intermediate pipe and the test pipe are located at different circumferential positions of the annular pipe.

[0009] In one or more embodiments, the air extraction device for testing is provided with four of the intermediate pipes.

[0010] In one or more embodiments, the air extraction device for testing is provided with four of the test pipes, the four test pipes are circumferentially evenly distributed, and each test pipe is arranged at the circumferential intermediate position between two adjacent intermediate pipes in the circumferential direction.

[0011] In one or more embodiments, the flow diameter of the annular pipe is greater than or equal to twice the flow diameter of the intermediate pipe and less than or equal to three times the flow diameter of the intermediate pipe.

[0012] In one or more embodiments, the inner diameter of the annular pipe is greater than 1.5 times the flow diameter of the annular pipe and less than four times the flow diameter of the annular pipe.

[0013] In one or more embodiments, the flow diameter of the test pipe is greater than or equal to 0.1 times the flow diameter of the air extraction pipe and less than or equal to 0.2 times the flow diameter of the air extraction pipe.

[0014] In one or more embodiments, the flow diameter of the intermediate pipe is greater than or equal to twice the flow diameter of the test pipe and less than or equal to three times the flow diameter of the test pipe.

[0015] In a second aspect, the present invention provides an air extraction test assembly. According to an embodiment of the present invention, the air extraction test assembly includes a sensor and the above-mentioned air extraction device for testing; wherein, each test pipe communicates the annular pipe with the sensor.

[0016] The embodiments of the present invention at least have the following beneficial effects:

[0017] The air extraction pipe extracts air from inside the casing, multiple intermediate pipes extract air from multiple circumferential positions evenly distributed on the same cross-section of the air extraction pipe, the gas flows through the same distance in each intermediate pipe to reach the annular pipe, the annular pipe receives the gas at multiple evenly distributed circumferential positions, the gas flows circumferentially in the annular pipe, improving the uniformity of the gas at each position in the annular pipe, thereby improving the uniformity of the gas extracted from the annular pipe by each test pipe, reducing the deviation of the gas parameters (such as pressure) measured by each sensor, and improving the accuracy and reliability of the air extraction test. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above-mentioned and other features, properties and advantages of the present invention will become more obvious through the following description in conjunction with the drawings and embodiments, wherein:

[0019] Figure 1 It is a schematic block diagram of the existing test bleed air;

[0020] Figure 2 It is a perspective view of the existing bleed air test assembly;

[0021] Figure 3 It is a sectional view of the existing bleed air test assembly;

[0022] Figure 4 It is a perspective view of the bleed air device for testing of the present invention;

[0023] Figure 5 It is a top view of the bleed air device for testing of the present invention;

[0024] Figure 6 For Figure 5 The sectional view at A - A in

[0025] Figure 7 It is a front view of the bleed air device for testing of the present invention;

[0026] Figure 8 For Figure 7 The sectional view at E - E in

[0027] Reference numerals:

[0028] 90 - Airflow direction;

[0029] 91 - Bleed air pipeline;

[0030] 92 - Aeroengine;

[0031] 93 - Specific position of the aeroengine;

[0032] 94 - Sensor;

[0033] 95 - Casing;

[0034] 1 - Bleed air pipe;

[0035] 2 - Base body;

[0036] 3 - Bleed air seat;

[0037] 4 - Bolt;

[0038] 5 - Annular pipe;

[0039] 6 - Intermediate pipe;

[0040] 7 - Test pipe. Detailed implementation manners

[0041] Reference will now be made in detail to embodiments of the present invention, one or more examples of which are illustrated in the accompanying drawings. Each example is provided for the purpose of explaining the present invention, not limiting the present invention. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the scope or spirit of the present invention. For example, features shown or described as part of one embodiment can be used with another embodiment to yield yet another embodiment. Accordingly, the present invention is intended to cover these modifications and variations that fall within the scope of the appended claims and their equivalents.

[0042] It should be noted that these and subsequent other drawings are only examples, and they are not drawn under the condition of equal proportion, and should not be used to limit the actual scope of protection required by the present invention.

[0043] As Figure 4 shown, the air extraction device for testing includes an air extraction pipe 1. The air extraction pipe 1 extracts air outward from within the casing 95 of an aeroengine. A seat body 2 can be provided at the end of the air extraction pipe 1, and the seat body 2 can be connected to the air extraction seat 3 of the casing 95 through four bolts 4. The air extraction pipe 1 and the seat body 2 can be welded.

[0044] As Figure 7 shown, the air extraction device for testing further includes an annular pipe 5. The annular pipe 5 is circular, the air extraction pipe 1 is located at the center of the annular pipe 5, the air extraction pipe 1 passes through the center of the annular pipe 5 along the central axis of the annular pipe, the annular pipe 5 surrounds the air extraction pipe 1, and the radial distance from each position in the circumferential direction of the annular pipe 5 to the air extraction pipe 1 is the same.

[0045] As Figure 5 shown, the air extraction device for testing further includes a plurality of intermediate pipes 6. Each intermediate pipe 6 bridges the annular pipe 5 and the air extraction pipe 1. The intermediate pipe 6 can be located in the annular space between the air extraction pipe 1 and the annular pipe 5, and is a straight pipe extending radially, with both ends communicating with the annular pipe 5 and the air extraction pipe 1 respectively. Both ends of the intermediate pipe 6 can be welded to the annular pipe 5 and the air extraction pipe 1 respectively. The plurality of intermediate pipes 6 are circumferentially evenly distributed, and the circumferential interval between every two adjacent intermediate pipes 6 in the circumferential direction is the same.

[0046] As Figure 4 shown, the air extraction device for testing further includes a plurality of test pipes 7. Each test pipe 7 communicates the annular pipe 5 with the outside. The test pipe 7 can be welded to the outer peripheral wall of the annular pipe 5. The test pipe 7 can be a right-angle elbow pipe. In the air extraction test assembly, the air extraction test assembly includes a sensor (not shown in the figure) and the air extraction device for testing according to the embodiment of the present invention, and each test pipe 7 communicates the annular pipe 5 with the sensor.

[0047] The bleed air pipe 1 bleeds air outwards from within the casing 95. Multiple intermediate pipes 6 bleed air from multiple circumferential positions evenly distributed on the same cross-section of the bleed air pipe 1. The gas flows through the same distance within each intermediate pipe 6 to reach the annular pipe 5. The annular pipe 5 receives the gas at multiple circumferentially distributed positions. The gas flows circumferentially within the annular pipe 5, enhancing the uniformity of the gas at each position within the annular pipe 5, thereby enhancing the uniformity of the gas bled from the annular pipe 5 by each test pipe 7, reducing the deviation of the gas parameters (such as pressure) measured by each sensor, and enhancing the accuracy and reliability of the bleed air test. In addition, when the air flow within the casing 95 fluctuates, causing the air flow within the bleed air pipe 1 to fluctuate, the annular pipe 5 provides a buffer space, and the transmission of the air flow fluctuation is attenuated within the annular pipe 5, such that the bleed air of the test pipe 7 is not easily affected by the air flow fluctuation, enhancing the accuracy and reliability of the bleed air test.

[0048] Multiple test pipes 7 can be circumferentially evenly distributed, and each two circumferentially adjacent test pipes 7 have the same circumferential interval, further enhancing the uniformity of the gas bled from the annular pipe 5 by each test pipe 7, and enhancing the accuracy and reliability of the bleed air test.

[0049] As Figure 8 shown, the intermediate pipes 6 and the test pipes 7 can be located at different circumferential positions of the annular pipe 5. The circumferential positions of the intermediate pipes 6 and the test pipes 7 do not coincide, and the outlet of the intermediate pipe 6 and the inlet of the test pipe 7 are not located in the same cross-section, avoiding the gas bled from the intermediate pipe 6 flowing directly into the test pipe 7 due to the outlet of the intermediate pipe 6 and the inlet of the test pipe 7 being in the same cross-section. The gas bled from the intermediate pipe 6 flows circumferentially within the annular pipe 5 and then flows into the test pipe 7, ensuring the uniformity of the gas bled from the annular pipe 5 by each test pipe 7 and ensuring the accuracy and reliability of the bleed air test.

[0050] As Figure 8 shown, the test bleed air device can be provided with four intermediate pipes 6, and the central angle between two circumferentially adjacent intermediate pipes 6 is 90°. The test bleed air device can be provided with four test pipes 7. Only two test pipes 7 are shown in the figure for simplified display. The four test pipes 7 are circumferentially evenly distributed, and the central angle between two circumferentially adjacent test pipes 7 is 90°. Each test pipe 7 is arranged at the circumferential middle position between two circumferentially adjacent intermediate pipes 6. The intermediate pipes 6 and the test pipes 7 are circumferentially spaced apart along the annular pipe 5. Each intermediate pipe 6 is circumferentially adjacent to two test pipes 7, and each test pipe 7 is circumferentially adjacent to two intermediate pipes 6. The central angle between a circumferentially adjacent intermediate pipe 6 and a test pipe 7 is 45°, and the circumferential distance from each intermediate pipe 6 to the circumferentially adjacent test pipe 7 is the same, further enhancing the uniformity of the gas bled from the annular pipe 5 by each test pipe 7 and enhancing the accuracy and reliability of the bleed air test.

[0051] As Figure 6 shown, considering the gas pressure inside the bleed air pipe 1, according to the pipeline wall thickness calculation formula where S is the wall thickness, Pk is the maximum pressure of the gas in the air intake pipe 1, d is the outer diameter of the air intake pipe 1, [[σ b , is the tensile strength of the air intake pipe 1. It is calculated that the wall thickness needs to be more than 1 mm (millimeter, the same below). Considering the weight of the air intake pipe 1, the relationship between the flow diameter d2 of the air intake pipe 1 and the outer diameter d1 of the air intake pipe 1 can be d2 + 2 mm ≤ d1 ≤ d2 + 6 mm. The flow diameter d2 of the air intake pipe 1 can be in the range of 30 mm to 50 mm, which is mainly calculated according to the required air intake volume of the air intake pipe 1, and at the same time taking into account the structural strength of the casing 95.

[0052] As Figure 6 shown, the flow diameter of the seat body 2 can be the same as the flow diameter d2 of the air intake pipe 1. The flow diameter d3 of the air intake seat 3 can be smaller than the flow diameter d2 of the air intake pipe 1, so that the gas flow from the casing 95 to the air intake pipe 1 is smooth and the air intake is smooth. The value by which the flow diameter d3 of the air intake seat 3 is smaller than the flow diameter d2 of the air intake pipe 1 can be approximately the wall thickness of the air intake pipe 1. The relationship between the flow diameter d3 of the air intake seat 3 and the flow diameter d2 of the air intake pipe 1 can be d2 + 1 mm ≤ d3 ≤ d2 + 5 mm.

[0053] As Figure 8 shown, the flow diameter m1 of the annular pipe 5 can be greater than or equal to twice the flow diameter d7 of the intermediate pipe 6 and less than or equal to three times the flow diameter d7 of the intermediate pipe 6. The relationship between the flow diameter m1 of the annular pipe 5 and the flow diameter d7 of the intermediate pipe 6 can be 2 * d7 ≤ m1 ≤ 3 * d7, which makes the intermediate pipe 6 smoothly draw air from the casing 95, makes the gas pressure at each position in the circumferential direction of the annular pipe 5 uniform, and reduces the gas pressure loss.

[0054] As Figure 8 shown, the inner diameter D12 of the annular pipe 5 can be greater than 1.5 times the flow diameter m1 of the annular pipe 5, which makes the annular pipe 5 have sufficient circumferential length to ensure that the gas pressure at each position in the circumferential direction of the annular pipe 5 is uniform, and less than 4 times the flow diameter m1 of the annular pipe 5, so that the length of the annular pipe 5 is not too long, avoiding the intermediate pipe 6 being too long and having insufficient strength. The relationship between the inner diameter D12 of the annular pipe 5 and the flow diameter m1 of the annular pipe 5 can be 1.5 * m1 < D12 < 4 * m1.

[0055] As Figure 6 and Figure 8 shown, the inner diameter D12 of the annular pipe 5 is greater than the outer diameter d1 of the air intake pipe 1, and the length of the intermediate pipe 6 can be less than the outer diameter d1 of the air intake pipe 1 to improve the strength of the intermediate pipe 6. The inner diameter D12 of the annular pipe 5 can be less than or equal to twice the outer diameter d1 of the air intake pipe 1. The relationship between the inner diameter D12 of the annular pipe 5 and the outer diameter d1 of the air intake pipe 1 can be 1.1 * d1 < D12 ≤ 2 * d1.

[0056] As Figure 8As shown, according to the aforementioned pipeline wall thickness calculation formula, the wall thickness of the annular pipe 5 can be 1 mm to 3 mm to ensure the strength of the annular pipe 5. The relationship between the outer diameter D11 and the inner diameter D12 of the annular pipe 5 and the flow diameter m1 of the annular pipe 5 can be D12 + m1 + 2 mm ≤ D11 ≤ D12 + m1 + 6 mm.

[0057] As Figure 6 shown, the flow diameter d4 of the test pipe 7 can be greater than or equal to 0.1 times and less than or equal to 0.2 times the flow diameter d2 of the air inlet pipe 1, which makes the air intake volume of the test pipe 7 0.1% to 10% of the air intake volume of the air inlet pipe 1. The relationship between the flow diameter d4 of the test pipe 7 and the flow diameter d2 of the air inlet pipe 1 can be 0.1 * d2 ≤ d4 ≤ 0.2 * d2. The flow diameter d4 of the test pipe 7 can be 2 mm to 6 mm.

[0058] As Figure 6 shown, according to the aforementioned pipeline wall thickness calculation formula, the wall thickness of the test pipe 7 can be 0.5 mm to 1.5 mm to ensure the strength of the test pipe 7. The relationship between the flow diameter d4 of the test pipe 7 and the outer diameter d5 of the test pipe 7 can be d4 + 1 mm ≤ d5 ≤ d4 + 3 mm.

[0059] As Figure 6 and Figure 8 shown, the flow diameter d7 of the intermediate pipe 6 can be greater than or equal to twice and less than or equal to three times the flow diameter d4 of the test pipe 7 to ensure smooth air intake of the test pipe 7. The relationship between the flow diameter d7 of the intermediate pipe 6 and the flow diameter d4 of the test pipe 7 can be 2 * d4 ≤ d7 ≤ 3 * d4.

[0060] As Figure 8 shown, according to the aforementioned pipeline wall thickness calculation formula, the wall thickness of the intermediate pipe 6 can be 0.5 mm to 1.5 mm to ensure the strength of the intermediate pipe 6. The relationship between the outer diameter d8 of the intermediate pipe 6 and the flow diameter d7 of the intermediate pipe 6 can be d7 + 1 mm ≤ d8 ≤ d7 + 3 mm.

[0061] Although the present invention is disclosed above by way of embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention.

Claims

1. A test air bleed device for an aircraft engine, characterized in that include: Bleed air duct, used to draw air from the casing of an aircraft engine; an annular tube, surrounding the air duct, wherein the air duct is located at the center of the annular tube; A plurality of intermediate tubes, uniformly distributed in the circumferential direction, each intermediate tube bridging the annular tube and the air duct; as well as A plurality of test tubes are provided, each of which connects the annular tube with the outside.

2. The test air bleed device according to claim 1, characterized in that: The multiple test tubes are evenly distributed around the circumference.

3. The test air bleed device according to claim 1, characterized in that: The intermediate tube and the test tube are located at different circumferential positions of the annular tube.

4. The test air bleed device according to claim 1, characterized in that: The test air bleed device is provided with four intermediate pipes.

5. The test air bleed device according to claim 4, characterized in that: The test air bleed device is provided with four test tubes, the four test tubes are evenly distributed circumferentially, and each test tube is arranged at a circumferential middle position between two circumferentially adjacent intermediate tubes.

6. The test air bleed device according to claim 4, characterized in that: The flow diameter of the annular tube is greater than or equal to twice the flow diameter of the intermediate tube, and less than or equal to three times the flow diameter of the intermediate tube.

7. The air bleed device for testing according to claim 6, characterized in that: The inner diameter of the annular tube is greater than 1.5 times the flow diameter of the annular tube and less than four times the flow diameter of the annular tube.

8. The test air bleed device according to claim 5, characterized in that: The flow diameter of the test tube is greater than or equal to 0.1 times the flow diameter of the air bleed tube, and less than or equal to 0.2 times the flow diameter of the air bleed tube.

9. The test air bleed device according to claim 5, characterized in that: The flow diameter of the intermediate tube is greater than or equal to twice the flow diameter of the test tube, and less than or equal to three times the flow diameter of the test tube.

10. A bleed air test assembly, characterized in that include: sensor; as well as The test air bleed device according to any one of claims 1 to 9; in, Each of the test tubes connects the annular tube to the sensor.

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