Aerospace engine leak detection system

Abstract

The invention relates to an airspace engine leak detection system, and belongs to the technical field of gas tightness leak detection. The helium tank extends into the leak detection box through a gas transmission pipeline and is communicated with the inner cavity of the engine; the helium filling test bench is arranged on the outer side of the leak detection box and is located on the gas transmission pipeline; the valve V8 is arranged on the purging pipeline; one end of each of the first detection pipeline, the second detection pipeline, the third detection pipeline, the fourth detection pipeline and the fifth detection pipeline extends into the leakage detection box; the other ends of the first detection pipeline, the second detection pipeline, the third detection pipeline, the fourth detection pipeline and the fifth detection pipeline are gathered and then communicated with a total leakage detection pipeline; the total leak detection pipeline is respectively communicated with the vacuum pump and the helium mass spectrometer leak detector; valves V3-V7 are respectively arranged on the first detection pipeline, the second detection pipeline, the third detection pipeline, the fourth detection pipeline and the fifth detection pipeline; the detection efficiency of the leakage rate of the liquid engine is improved, and human factors are controlled.

Description

Technical Field

[0001] The invention belongs to the technical field of gas sealing leakage detection and relates to an aerospace engine leakage detection system. Background Art

[0002] Many aerospace products require high-tightness design, such as aerospace liquid engines, liquid engine piping systems, and fuel storage tanks. These products need to be tested for tightness by a helium mass spectrometer leak detector before use, and only qualified products can be shipped after meeting the design requirements.

[0003] In the past, the process of air tightness testing of liquid engines was to first fill the engine with a certain volume of helium through the equipment, then install the engine as a whole in a larger container by hoisting, and calculate the leakage rate of the engine by measuring the helium value of an output port. This is the overall leakage rate test of the engine. If the engine has a large leakage rate, the engine needs to be hoisted out of the container, and then the helium value of the engine is tested locally by a helium detector to determine the specific leakage point of the engine. This is the single-point leakage rate test of the engine.

[0004] The overall process flow is relatively complicated, which brings a large workload to the construction workers, and there are many human factors in the construction process.

[0005] For engine pulsation production lines or assembly lines, the above-mentioned processes and detection technologies cannot meet the production line rhythm. Summary of the invention

[0006] The technical problem solved by the present invention is to overcome the deficiencies of the prior art and propose an aerospace engine leak detection system to improve the detection efficiency of liquid engine leakage rate and control human factors.

[0007] The solution of the present invention is:

[0008] A space engine leak detection system, comprising a leak detection box, an engine, a helium-filled test bench, a helium cylinder, a valve V1, a valve V2, a valve V3, a valve V4, a valve V5, a valve V6, a valve V7, a valve V8, a first detection pipeline, a second detection pipeline, a third detection pipeline, a fourth detection pipeline, a fifth detection pipeline, a total leak detection pipeline, a purge pipeline, a gas transmission pipeline, a vacuum pump and a helium mass spectrometer leak detector;

[0009] Among them, the leak detection box is a hollow shell structure; the engine is arranged in the leak detection box; the helium cylinder is arranged on the outside of the leak detection box; the helium cylinder is extended into the leak detection box through the gas transmission pipeline and is connected with the inner cavity of the engine; the helium filling test bench is arranged on the outside of the leak detection box and is located on the gas transmission pipeline; one end of the purge pipeline is extended into the leak detection box; the other end of the purge pipeline is connected with the external compressed air cylinder; the valve V8 is arranged on the purge pipeline; the first detection pipeline, the second detection pipeline, the third detection pipeline, the fourth detection pipeline, and the fifth detection pipeline are all extended into the leak detection box at one end; the other ends of the first detection pipeline, the second detection pipeline, the third detection pipeline, the fourth detection pipeline, and the fifth detection pipeline are collected and connected with the total leak detection pipeline; the total leak detection pipeline is respectively connected with the vacuum pump and the helium mass spectrometer leak detector; the valve V3 is arranged on the first detection pipeline; the valve V4 is arranged on the second detection pipeline; the valve V5 is arranged on the third detection pipeline; the valve V6 is arranged on the fourth detection pipeline; the valve V7 is arranged on the fifth detection pipeline.

[0010] In the above-mentioned aerospace engine leak detection system, the leak detection system further includes a first fan and a second fan; the first fan and the second fan are arranged on the side walls of the inner cavity of the leak detection box.

[0011] In the above-mentioned aerospace engine leak detection system, the first detection pipeline, the second detection pipeline, the third detection pipeline, and the fourth detection pipeline extend into one end of the leak detection box and are respectively aligned with the five interfaces of the flange on the engine to detect the helium at the five interfaces of the engine; the fifth detection pipeline extends into one end of the leak detection box and is placed arbitrarily to detect the entire helium in the leak detection box.

[0012] In the above-mentioned aerospace engine leak detection system, before the detection begins, the gas in the leak detection box needs to be purged, and the gas in the first detection pipeline, the second detection pipeline, the third detection pipeline, the fourth detection pipeline, the fifth detection pipeline, and the total leak detection pipeline needs to be purged.

[0013] In the above-mentioned aerospace engine leak detection system, the method for purging the gas in the leak detection box is:

[0014] Open valve V8, input compressed air into the inner cavity of the leak detection box through the purge pipeline; and exhaust the gas inside the leak detection box through the first fan and the second fan;

[0015] The method for purging the gas in each pipeline is:

[0016] Open valves V1, V2, V3, V4, V5, V6 and V7, extract the gas in each pipeline with a vacuum pump, and detect it with a helium mass spectrometer leak detector at the same time; until no helium is detected.

[0017] In the above-mentioned aerospace engine leak detection system, after the purging is completed, detection is performed; the detection method is:

[0018] Open valves V1, V2 and V3, and close other valves; the vacuum pump extracts gas from the leak detection box through the first leak detection pipeline, and detects helium through a helium mass spectrometer leak detector;

[0019] Open valves V1, V2 and V4, and close other valves; the vacuum pump extracts gas from the leak detection box through the second leak detection pipeline, and detects helium through a helium mass spectrometer leak detector;

[0020] Open valves V1, V2 and V5, and close other valves; the vacuum pump extracts gas from the leak detection box through the third leak detection pipeline, and detects helium through a helium mass spectrometer leak detector;

[0021] Open valves V1, V2 and V6, and close other valves; the vacuum pump extracts gas from the leak detection box through the fourth leak detection pipeline, and detects helium through a helium mass spectrometer leak detector;

[0022] Open valves V1, V2 and V7, and close other valves; the vacuum pump extracts gas from the leak detection box through the fifth leak detection pipeline, and detects helium through a helium mass spectrometer leak detector.

[0023] In the above-mentioned aerospace engine leak detection system, the internal volume of the leak detection box is 9.5mm 3 ; The total load-bearing capacity of the bottom surface of the leak detection box is not less than 2.5 tons; During the test, the leak detection box is filled with 0.5m 3 of helium and sealed for 30 minutes.

[0024] In the above-mentioned aerospace engine leak detection system, the vacuum degree achieved by the vacuum pump is 1×10 -3 kpa; vacuum pump air flow rate is 40m 3 / h; the minimum detectable leakage rate of the helium mass spectrometer leak detector is 5×10 -2 pa·m 3 / s.

[0025] In the above-mentioned aerospace engine leak detection system, the fan flow rate is 1050-1250m 3 / h.

[0026] In the above-mentioned aerospace engine leak detection system, the helium filling test bench can achieve precise control of the helium output speed of the helium cylinder, and achieve an output pressure of 0.8 MPa; the gas transmission accuracy deviation is no more than ±1%.

[0027] The beneficial effects of the present invention compared with the prior art are:

[0028] (1) The leak detection system of the present invention highly integrates the previous single-point leak detection and overall leak detection. The helium detection method is determined to be the inhalation method, which detects the overall leakage rate or single-point leakage rate by inhaling the gas in the entire or differently distributed detection pipeline;

[0029] (2) The present invention solves the problems of inaccurate manual measurement and the inability to accurately control the distance between the leak detection port of the helium mass spectrometer leak detector and the measuring point, and improves the manual recording of leak detection data by introducing automated equipment such as AGV. Under the high-precision positioning conditions of AGV, the control device can accurately arrange the detection head on the measured point of the engine under the action of the mechanical posture adjustment mechanism;

[0030] (3) After effective system integration, the efficiency of the present invention is improved by 80%, from the previous operation of four people to one person monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the aerospace engine leak detection system of the present invention. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the embodiments.

[0033] The invention provides an aerospace engine leak detection system, which improves the detection efficiency of liquid engine leakage rate and controls human factors.

[0034] Aerospace engine leak detection system, such as Figure 1 As shown, it specifically includes a leak detection box, an engine, a helium-filled test bench, a helium cylinder, a valve V1, a valve V2, a valve V3, a valve V4, a valve V5, a valve V6, a valve V7, a valve V8, a first detection pipeline, a second detection pipeline, a third detection pipeline, a fourth detection pipeline, a fifth detection pipeline, a total leak detection pipeline, a purge pipeline, a gas transmission pipeline, a vacuum pump, a helium mass spectrometer leak detector, a first fan and a second fan;

[0035] Among them, the leak detection box is a hollow shell structure; the engine is arranged in the leak detection box; the helium cylinder is arranged on the outside of the leak detection box; the helium cylinder is extended into the leak detection box through the gas transmission pipeline and is connected with the inner cavity of the engine; the helium filling test bench is arranged on the outside of the leak detection box and is located on the gas transmission pipeline; one end of the purge pipeline is extended into the leak detection box; the other end of the purge pipeline is connected with the external compressed air cylinder; the valve V8 is arranged on the purge pipeline; the first detection pipeline, the second detection pipeline, the third detection pipeline, the fourth detection pipeline, and the fifth detection pipeline are all extended into the leak detection box at one end; the other ends of the first detection pipeline, the second detection pipeline, the third detection pipeline, the fourth detection pipeline, and the fifth detection pipeline are collected and connected with the total leak detection pipeline; the total leak detection pipeline is respectively connected with the vacuum pump and the helium mass spectrometer leak detector; the valve V3 is arranged on the first detection pipeline; the valve V4 is arranged on the second detection pipeline; the valve V5 is arranged on the third detection pipeline; the valve V6 is arranged on the fourth detection pipeline; the valve V7 is arranged on the fifth detection pipeline. The first fan and the second fan are arranged on the side wall of the inner cavity of the leak detection box.

[0036] The first detection pipeline, the second detection pipeline, the third detection pipeline, and the fourth detection pipeline extend into one end of the leak detection box and are respectively aligned with the five interfaces of the flange on the engine to detect the helium at the five interfaces of the engine; the fifth detection pipeline extends into one end of the leak detection box and is placed arbitrarily to detect the entire helium in the leak detection box.

[0037] Before the detection begins, the gas in the leak detection box needs to be purged, and the gas in the first detection pipeline, the second detection pipeline, the third detection pipeline, the fourth detection pipeline, the fifth detection pipeline, and the total leak detection pipeline needs to be purged.

[0038] The method for purging the gas in the leak detection box is:

[0039] Open valve V8, input compressed air into the inner cavity of the leak detection box through the purge pipeline; and exhaust the gas inside the leak detection box through the first fan and the second fan;

[0040] The method for purging the gas in each pipeline is:

[0041] Open valves V1, V2, V3, V4, V5, V6 and V7, extract the gas in each pipeline with a vacuum pump, and detect it with a helium mass spectrometer leak detector at the same time; until no helium is detected.

[0042] After the purge is completed, the test is carried out; the test method is:

[0043] Open valves V1, V2 and V3, and close other valves; the vacuum pump extracts gas from the leak detection box through the first leak detection pipeline, and detects helium through a helium mass spectrometer leak detector.

[0044] Open valves V1, V2 and V4, and close other valves; the vacuum pump extracts gas from the leak detection box through the second leak detection pipeline, and detects helium through a helium mass spectrometer leak detector.

[0045] Open valves V1, V2 and V5, and close other valves; the vacuum pump extracts gas from the leak detection box through the third leak detection pipeline, and detects helium through a helium mass spectrometer leak detector.

[0046] Open valves V1, V2 and V6, and close other valves; the vacuum pump extracts gas from the leak detection box through the fourth leak detection pipeline, and detects helium through a helium mass spectrometer leak detector.

[0047] Open valves V1, V2 and V7, and close other valves; the vacuum pump extracts gas from the leak detection box through the fifth leak detection pipeline, and detects helium through a helium mass spectrometer leak detector.

[0048] Complete the inspection of each leak detection pipeline and each detection point in turn.

[0049] In addition, the present invention has carried out detailed design of each component in the system, and the internal volume of the leak detection box is 9.5mm 3 ; The total load-bearing capacity of the bottom surface of the leak detection box is not less than 2.5 tons; During the test, the leak detection box is filled with 0.5m 3 of helium and sealed for 30 minutes.

[0050] The vacuum degree achieved by the vacuum pump is 1×10 -3 kpa; vacuum pump air flow rate is 40m 3 / h; the minimum detectable leakage rate of the helium mass spectrometer leak detector is 5×10 -2 pa·m 3 / s.

[0051] Fan flow rate is 1050-1250m 3 / h.

[0052] The helium filling test bench can achieve precise control of the helium output speed of the helium cylinder, and the output pressure is 0.8Mpa; the gas transmission accuracy deviation is no more than ±1%.

[0053] The present invention solves the problems of inaccurate manual measurement and the inability to accurately control the distance between the leak detection port of the helium mass spectrometer leak detector and the measuring point, and improves the manual recording of leak detection data. It introduces automated equipment such as AGV. Under the high-precision positioning conditions of AGV, the control device can accurately arrange the detection head on the measured point of the engine under the action of the mechanical posture adjustment mechanism. The measurement data is stored in the storage unit through the internal design communication of the equipment and the measurement value is displayed through the display. At the same time, the control device can also perform real-time detection of the entire system and machinery to ensure the reliability and safety of the system.

[0054] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. An aerospace engine leak detection system, characterized in that: It includes a leak detection box, an engine, a helium-filled test bench, a helium cylinder, valve V1, valve V2, valve V3, valve V4, valve V5, valve V6, valve V7, valve V8, a first detection pipeline, a second detection pipeline, a third detection pipeline, a fourth detection pipeline, a fifth detection pipeline, a total leak detection pipeline, a purge pipeline, a gas transmission pipeline, a vacuum pump and a helium mass spectrometer leak detector; Among them, the leak detection box is a hollow shell structure; the engine is arranged in the leak detection box; the helium cylinder is arranged on the outside of the leak detection box; the helium cylinder extends into the leak detection box through the gas transmission pipeline and is connected with the inner cavity of the engine; the helium filling test bench is arranged on the outside of the leak detection box and is located on the gas transmission pipeline; one end of the purge pipeline extends into the leak detection box; the other end of the purge pipeline is connected to the external compressed air cylinder; the valve V8 is arranged on the purge pipeline; the first detection pipeline, the second detection pipeline, the third detection pipeline, the fourth detection pipeline, and the fifth detection pipeline all extend into the leak detection box at one end; the other ends of the first detection pipeline, the second detection pipeline, the third detection pipeline, the fourth detection pipeline, and the fifth detection pipeline are collected and connected with the total leak detection pipeline; the total leak detection pipeline is respectively connected with the vacuum pump and the helium mass spectrometer leak detector; the valve V3 is arranged on the first detection pipeline; the valve V4 is arranged on the second detection pipeline; the valve V5 is arranged on the third detection pipeline; the valve V6 is arranged on the fourth detection pipeline; the valve V7 is arranged on the fifth detection pipeline.

2. The aerospace engine leak detection system according to claim 1, characterized in that: The leak detection system also includes a first fan and a second fan; the first fan and the second fan are arranged on the side wall of the inner cavity of the leak detection box.

3. The aerospace engine leak detection system according to claim 2, characterized in that: The first detection pipeline, the second detection pipeline, the third detection pipeline, and the fourth detection pipeline extend into one end of the leak detection box and are respectively aligned with the five interfaces of the flange on the engine to detect the helium at the five interfaces of the engine; the fifth detection pipeline extends into one end of the leak detection box and is placed arbitrarily to detect the entire helium in the leak detection box.

4. The aerospace engine leak detection system according to claim 3, characterized in that: Before the detection begins, the gas in the leak detection box needs to be purged, and the gas in the first detection pipeline, the second detection pipeline, the third detection pipeline, the fourth detection pipeline, the fifth detection pipeline, and the total leak detection pipeline needs to be purged.

5. The aerospace engine leak detection system according to claim 4, characterized in that: The method for purging the gas in the leak detection box is: Open valve V8, input compressed air into the inner cavity of the leak detection box through the purge pipeline; and exhaust the gas inside the leak detection box through the first fan and the second fan; The method for purging the gas in each pipeline is: Open valves V1, V2, V3, V4, V5, V6 and V7, extract the gas in each pipeline with a vacuum pump, and detect it with a helium mass spectrometer leak detector at the same time; until no helium is detected.

6. The aerospace engine leak detection system according to claim 5, characterized in that: After the purge is completed, the test is carried out; the test method is: Open valves V1, V2 and V3, and close other valves; the vacuum pump extracts gas from the leak detection box through the first leak detection pipeline, and detects helium through a helium mass spectrometer leak detector; Open valves V1, V2 and V4, and close other valves; the vacuum pump extracts gas from the leak detection box through the second leak detection pipeline, and detects helium through a helium mass spectrometer leak detector; Open valves V1, V2 and V5, and close other valves; the vacuum pump extracts gas from the leak detection box through the third leak detection pipeline, and detects helium through a helium mass spectrometer leak detector; Open valves V1, V2 and V6, and close other valves; the vacuum pump extracts gas from the leak detection box through the fourth leak detection pipeline, and detects helium through a helium mass spectrometer leak detector; Open valves V1, V2 and V7, and close other valves; the vacuum pump extracts gas from the leak detection box through the fifth leak detection pipeline, and detects helium through a helium mass spectrometer leak detector.

7. The aerospace engine leak detection system according to claim 1, characterized in that: The internal volume of the leak detection box is 9.5mm 3 ; The total load-bearing capacity of the bottom surface of the leak detection box is not less than 2.5 tons; During the test, the leak detection box is filled with 0.5m 3 of helium and sealed for 30 minutes.

8. The aerospace engine leak detection system according to claim 1, characterized in that: The vacuum degree achieved by the vacuum pump is 1×10 -3 kpa; vacuum pump air flow rate is 40m 3 / h; the minimum detectable leakage rate of the helium mass spectrometer leak detector is 5×10 -2 pa·m 3 / s.

9. The aerospace engine leak detection system according to claim 1, characterized in that: The fan flow rate is 1050-1250m 3 / h.

10. The aerospace engine leak detection system according to claim 1, characterized in that: The helium filling test bench can achieve accurate control of the helium output speed of the helium cylinder, and achieve an output pressure of 0.8 MPa; the gas transmission accuracy deviation is no more than ±1%.

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