Vacuum chamber multi-point delivery fault detection system and method based on pickup matrix

Abstract

The present application relates to a kind of vacuum chamber multipoint transmission fault detection system and method based on pickup matrix for valve, to solve the technical problems of existing valve fault judgment system, cumbersome operation, difficult to check, the system includes middle sound guide vacuum tube including cylindrical shell and the sound transmission core being set in shell inside;Sound mapping board is provided with multiple groups of sound insulation layer and sound transmission layer;Sound guide vacuum tube connects the detection point of valve to be measured and the sound transmission layer on sound mapping board;Pickup matrix is set in vacuum chamber for receiving sound signal.The method comprises: 1, determine fault judgment standard;2, using the real-time detection of vacuum chamber multipoint transmission fault detection system based on pickup matrix;3, according to detection data, judge whether there is fault, if there is fault, judge fault type and leakage amount when internal leakage occurs.

Description

TECHNICAL FIELD

[0001] The present application relates to a valve fault detection system and method through sound transmission, in particular to a vacuum chamber multi-point transmission fault detection system and method based on a sound pickup matrix for a valve. BACKGROUND

[0002] In rocket engine testing, various valves need to be used on site, and due to the complexity of the system, the interface is multiple, the distribution range is large, and the traditional valve fault judgment is generally based on the traditional valve action time judgment, and the on-site observation is artificial; It is greatly affected by the experience of the operator, and the judgment of the fault lacks systematicness, especially in the process of using actual medium, the fault of the valve often causes the interruption of the test process, and even causes the failure of the test.

[0003] The current conventional way is to directly measure various related parameters in the use process of the valve, and to judge the fault of the valve through the change of the parameters, which needs to adaptively modify the valve, and the operation process is complicated.

[0004] Before the engine test, the sealing of the valve usually needs to be checked, and the conventional method is generally to smear soap bubbles, and due to the multiple interfaces, the large distribution range and the space arrangement, the checking difficulty is large, so the method is low in efficiency, and it is difficult to implement when the air temperature is lower than 0 degrees, and the poor sealing of the valve is easy to cause internal leakage, which often causes the interruption or failure of the test. SUMMARY

[0005] The present application aims to solve the technical problems of poor systematicness, complicated operation and large checking difficulty of the existing valve fault judgment system, and proposes a vacuum chamber multi-point transmission fault detection system and method based on a sound pickup matrix.

[0006] The general idea of the present application is: based on a multi-directional sound pickup matrix, through the typical characteristics of the related fault full-band, such as the sound emission signal, the sound emission signal can be divided into burst type sound emission signal (for example: diaphragm crack) and continuous type sound emission signal (for example: valve internal leakage) according to the time interval and the difficulty of signal differentiation, the typical signal is extracted to realize accurate fault detection, and a vacuum chamber multi-point transmission mapping sound fault diagnosis system is designed for the complex on-site environment.

[0007] The technical scheme provided by the present application is:

[0008] A vacuum chamber multi-point transmission fault detection system based on a sound pickup matrix is used for real-time fault detection of a plurality of detection points of a valve to be tested, and the special feature is that it comprises a sound pickup matrix data acquisition system, a valve parameter acquisition system and a data receiving and processing system.

[0009] The sound pickup matrix data acquisition system comprises a sound mapping plate, a sound pickup matrix unit, a vacuum chamber and a plurality of sound guide vacuum tubes.

[0010] The sound guide vacuum tube comprises a cylindrical shell and a sound transmission core arranged inside the shell, and a vacuum layer is formed around the sound transmission core;

[0011] The sound mapping plate is arranged on the vacuum chamber, and the sound mapping plate has a plurality of first through holes, each of which communicates with the vacuum chamber; a cylindrical sound insulation layer is embedded in each first through hole, and a sound transmission layer is embedded in the sound insulation layer;

[0012] The first end of the sound guide vacuum tube is connected to the corresponding valve detection point to be tested through a sound access element, and the end of the sound transmission core abuts against the outer surface of the valve detection point to be tested;

[0013] The second end of the sound guide vacuum tube abuts against the corresponding sound transmission layer on the sound mapping plate through a connecting assembly, and the vacuum layer communicates with the vacuum chamber through a vacuum hole arranged in the sound transmission layer;

[0014] The pickup matrix unit is arranged in the vacuum chamber and comprises a plurality of sound collection assemblies corresponding to the sound transmission layers one by one, and the plurality of sound collection assemblies are respectively used for receiving sound signals transmitted by the sound transmission layers; the output end of the pickup matrix unit is electrically connected to the data receiving and processing system; the distance between each valve detection point to be tested and the corresponding sound collection assembly is X, and X≥3N, where N is the length of the approach zone;

[0015] The valve parameter acquisition system comprises a pressure measurement unit, a temperature measurement unit and a vibration measurement unit, and the pressure measurement unit, the temperature measurement unit and the vibration measurement unit are respectively electrically connected to the data receiving and processing system, and are used for collecting pressure, temperature and vibration frequency data of the valve to be tested in real time and transmitting the data to the data receiving and processing system.

[0016] Further, the connecting assembly comprises a pressure bearing block, a fixed groove and a movable groove;

[0017] The fixed groove is cylindrical and fixed on the sound transmission layer, and the end of the fixed groove away from the sound transmission layer is threadedly connected to the slot opening of the movable groove;

[0018] The pressure bearing block is fixed on the outer side wall of the sound guide vacuum tube, and the groove bottom of the movable groove is provided with a second through hole; the first end of the sound guide vacuum tube penetrates through the second through hole, and the side of the pressure bearing block away from the sound transmission layer abuts against the inner surface of the groove bottom of the movable groove, so that the groove bottom of the movable groove exerts pressure on the pressure bearing block during the threadedly screwed connection between the inner side of the movable groove and the outer side of the fixed groove, thereby achieving the abutment between the second end of the sound guide vacuum tube and the sound transmission layer;

[0019] The sound access element is a cylindrical structure and is fixed on the valve detection point to be tested, and the sound access element is threadedly connected to the shell of the first end of the sound guide vacuum tube.

[0020] Further, a pre-warning system is further included for receiving the fault signal sent by the data receiving and processing system and sending a sound and light warning.

[0021] Further, the pickup frequency of the pickup matrix data acquisition system is 0-40 kHz.

[0022] Further, the pressure measuring unit includes pressure sensors arranged at the outlet and inlet of the valve to be measured, the temperature measuring unit includes temperature sensors arranged at the outlet and inlet of the valve to be measured, and the vibration measuring unit includes vibration sensors arranged at the outlet and inlet of the valve to be measured, and the output ends of the pressure sensors, temperature sensors and vibration sensors are electrically connected with the data receiving and processing system.

[0023] The application further provides a vacuum chamber multi-point transmission fault detection method based on a pickup matrix, which is characterized in that the method comprises the following steps:

[0024] S1, determining a fault judgment standard

[0025] The sound intensity threshold of the valve detection point of the valve to be measured is A;

[0026] The sound pressure relative amplitude threshold of the acoustic emission signal type judgment is B;

[0027] A valve with a leakage fault is used, the valve with a leakage fault is of the same type as the valve to be measured, and a standard curve of sound intensity signal and leakage amount is obtained by adjusting the outlet and inlet pressure of the valve at different temperatures;

[0028] S2, real-time detection

[0029] Before the engine test, the valve detection point of the valve to be measured is connected with the vacuum chamber multi-point transmission fault detection system based on a pickup matrix;

[0030] Start the test, and use the vacuum chamber multi-point transmission fault detection system based on a pickup matrix to perform real-time detection;

[0031] The valve parameter acquisition system is used to measure the temperature, vibration frequency and pressure of the outlet and inlet of the valve to be measured in real time;

[0032] The pickup matrix data acquisition system is used to acquire the sound intensity and sound pressure relative amplitude of each valve detection point of the valve to be measured;

[0033] S3, data judgment

[0034] S3.1, using the data receiving and processing system, according to the sound intensity of the detection point of the valve to be tested, if the sound intensity is less than or equal to A, the corresponding detection point of the valve to be tested is normal, and the test continues; if the sound intensity is greater than A, the corresponding detection point of the valve to be tested is faulty, and step S3.2 is entered;

[0035] S3.2, according to the sound pressure relative amplitude of the detection point of the valve to be tested, if the sound pressure relative amplitude is greater than B, the sound signal is a burst acoustic emission signal, the test is paused, the valve to be tested and the vacuum chamber based on the sound pickup matrix multi-point transmission fault detection system are closed, and the corresponding detection point is repaired or the valve is replaced;

[0036] if the sound pressure relative amplitude is less than or equal to B, the sound signal is a continuous acoustic emission signal, and step S3.3 is entered;

[0037] S3.3, using the temperature, vibration frequency and pressure of the inlet and outlet of the valve to be tested in the current test state, and the standard curve of the sound intensity signal and the leakage amount obtained, the leakage amount of the corresponding detection point of the valve to be tested is obtained according to the sound intensity.

[0038] Further, in step S2, the vacuum degree in the vacuum chamber is measured in real time during the measurement process, and the vacuum degree is less than 7 kpa.

[0039] Further, in step S1, a valve with a leakage fault is used, the valve with a leakage fault is of the same type as the valve to be tested, and the standard curve of the sound intensity signal and the leakage amount is obtained by adjusting the pressure at the inlet and outlet of the valve at different temperatures, specifically:

[0040] S1.1, determining the current temperature;

[0041] S1.2, adjusting different leakage amounts by adjusting the pressure at the inlet and outlet of the valve, measuring the sound intensity corresponding to different leakage amounts by the sound pickup matrix unit, and fitting the standard curve of the sound intensity and the leakage amount at the current temperature according to the measurement results;

[0042] S1.3, adjusting the temperature, repeating step S1.2, and obtaining the standard curve of the sound intensity and the leakage amount at each required temperature.

[0043] Further, in step S3.3, if the leakage amount of the corresponding detection point of the valve to be tested is less than a preset leakage amount threshold k, the test continues; if the leakage amount of the corresponding detection point of the valve to be tested is greater than or equal to the preset leakage amount threshold k, the test is paused, and the valve is repaired or replaced.

[0044] Further, in step S3.1, if the sound intensity is greater than A, the corresponding detection point of the valve to be tested is faulty, and the fault signal is sent to the early warning system through the data receiving and processing system, and the early warning system issues an alarm for fault warning.

[0045] The beneficial effects of the present application are as follows:

[0046] 1、The vacuum chamber multi-point transmission fault detection system based on the pickup matrix of the present application connects the valve detection points to be measured and the sound transmission layer on the sound mapping plate through the sound guide vacuum pipe, and the sound transmission core for sound transmission is in a vacuum environment, avoiding the influence of the external environment on the sound signal and improving the detection accuracy.

[0047] 2、The sound insulation layer and the sound transmission layer on the sound mapping plate in the present application constitute mapping points, and the sound insulation layer of each mapping point insulates the sound signals corresponding to each mapping point, avoiding the conduction of the sound signals on the sound mapping plate, the mutual interference of the sound signals of the mapping points, and further improving the detection accuracy.

[0048] 3、The method provided by the present application can quickly and accurately judge whether there is a fault and the type of the fault according to the sound intensity and the sound pressure relative amplitude of each valve detection point to be measured obtained by measurement and according to the set threshold value, the operation is simple, the detection efficiency is high, the fault can be found in the early stage and handled in time, and the test failure or accident can be avoided.

[0049] 4、The present application obtains the leakage amount through the sound intensity and monitors it, which can judge whether the test can continue according to the leakage amount, on the one hand, avoids the time delay caused by stopping the test due to a small amount of leakage, improves the test efficiency, and on the other hand, avoids the test failure or accident caused by a large amount of leakage.

[0050] 5、The present application can also issue a warning through the early warning system according to the fault signal, so as to facilitate the staff to make corresponding judgment and operation according to the fault condition. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 It is an embodiment schematic diagram of the pickup matrix data acquisition system in the vacuum chamber multi-point transmission fault detection system based on the pickup matrix of the present application.

[0052] Figure 2 It is a schematic diagram of the sound mapping plate in the embodiment of the present application.

[0053] Figure 3 It is a schematic diagram of the sound guide vacuum pipe in the embodiment of the present application.

[0054] Figure 4 It is Figure 2 A-A sectional view.

[0055] The reference signs are as follows:

[0056] 1-sound mapping board, 11-sound insulation layer, 12-sound transmission layer, 13-vacuum hole, 2-pickup matrix unit, 3-vacuum chamber, 4-sound guide vacuum tube, 41-outer shell, 42-vacuum layer, 43-sound transmission core, 44-pressure block, 45-moving groove, 46-fixed groove, 5-support frame, 6-valve to be tested. DETAILED DESCRIPTION

[0057] Reference Figures 1-4 The embodiment provides a vacuum chamber multi-point transmission fault detection system based on a pickup matrix, which is used for real-time fault detection of a plurality of detection points of a valve 6 to be tested. The selection of the valve detection points considers the moving parts of the valve and the positions where faults are prone to occur. The system comprises a pickup matrix data acquisition system, a valve parameter acquisition system, a data receiving and processing system and a warning system.

[0058] The pickup matrix data acquisition system comprises a sound mapping board 1, a pickup matrix unit 2, a vacuum chamber 3 and a plurality of sound guide vacuum tubes 4. The sound mapping board 1, the pickup matrix unit 2 and the vacuum chamber 3 are arranged on a support frame 5. The support frame 5 can be adjusted in height to facilitate the adaptation to different valves to be tested. The pickup frequency of the pickup matrix data acquisition system is 0-40 kHz, that is, the full frequency band, which is used to obtain the vibration category of the sound source according to the frequency and continuity of the sound field.

[0059] The sound guide vacuum tube 4 comprises a cylindrical outer shell 41. A sound transmission core 43 is arranged in the outer shell 41. The sound transmission core 43 is arranged to form a vacuum layer 42 around the sound transmission core 43. The sound transmission core 43 can be made of a metal material that can conduct sound or other materials with high sound conduction efficiency.

[0060] The sound mapping board 1 is arranged on the vacuum chamber 3. The sound mapping board 1 has a plurality of first through holes. Each first through hole is in communication with the vacuum chamber 3. A cylindrical sound insulation layer 11 is embedded in each first through hole. A sound transmission layer 12 is embedded in the sound insulation layer 11. The sound insulation layer 11 and the sound transmission layer 12 form a mapping point. The sound insulation layer 11 is generally made of a non-metal sound insulation material. The sound transmission layer 12 has large sound transmission attenuation, which greatly reduces the mutual interference of sound signals of the mapping points.

[0061] The first end of the sound guide vacuum tube 4 is connected with the corresponding valve detection point to be detected, the valve detection point to be detected is fixedly provided with a hollow sound access member, the sound access member is threadedly connected with the shell 41 of the sound guide vacuum tube 4 and is sealed, such as being provided with a sealing gasket or other sealing modes, so as to maintain the vacuum degree of the vacuum layer 42 of the sound guide vacuum tube; the end of the sound transmission core 43 abuts against the outer surface of the valve detection point to be detected; the second end of the sound guide vacuum tube 4 is connected with the sound transmission layer 12 on the sound mapping plate 1 through the connecting assembly, the sound transmission core 43 and the shell 41 of the sound guide vacuum tube 4 abut against the sound transmission layer 12, and the vacuum layer 42 of the sound guide vacuum tube 4 communicates with the vacuum chamber 3 through the vacuumizing hole 13 arranged on the sound transmission layer 12.

[0062] The pickup matrix unit 2 is arranged in the vacuum chamber 3 and comprises a plurality of sound collection assemblies corresponding to the sound transmission layer 12, the plurality of sound collection assemblies are used for respectively receiving the sound signals transmitted by the sound transmission layer 12, and the output end of the pickup matrix unit 2 is electrically connected with the data receiving and processing system; the distance between each valve detection point to be detected and the corresponding sound collection assembly is X, X≥3N, N is the length of the approach area, the sound wave propagates on the sound axis, and the sound pressure decreases with the increase of the distance in a long distance, but near the sound source, due to wave interference, a series of maximum and minimum sound pressure regions appear, and this region is the approach area; the connecting assembly comprises a pressure bearing block 44, a fixed groove 46 and a movable groove 45; the fixed groove 46 is cylindrical and fixed on the sound mapping plate 1, the pressure bearing block 44 is fixed on the outer side wall of the sound guide vacuum tube 4, and the groove bottom of the movable groove 45 is provided with a second through hole; the sound guide vacuum tube 4 passes through the second through hole, and the side of the pressure bearing block 44 away from the sound mapping plate 1 abuts against the inner surface of the groove bottom of the movable groove 45, so that the groove bottom of the movable groove 45 applies pressure to the pressure bearing block 44 during the threaded rotation of the inner side surface of the movable groove 45 and the outer side surface of the fixed groove 46, so that the second end of the sound guide vacuum tube 4 abuts against the sound transmission layer 12.

[0063] The valve parameter acquisition system comprises a pressure measuring unit, a temperature measuring unit and a vibration measuring unit, specifically, the pressure measuring unit comprises pressure sensors arranged at the outlet and the inlet of the valve to be detected, the temperature measuring unit comprises temperature sensors arranged at the outlet and the inlet of the valve to be detected, and the vibration measuring unit comprises vibration sensors arranged at the outlet and the inlet of the valve to be detected; the output ends of the pressure sensors, the temperature sensors and the vibration sensors are electrically connected with the data receiving and processing system, so as to collect the pressure, temperature and vibration frequency data of the valve to be detected in real time and transmit the data to the data receiving and processing system.

[0064] The early warning system is used for receiving the fault signal sent by the data receiving and processing system and sending an audible and visual warning.

[0065] Acoustic emission detection technology is based on the physical phenomenon that the object releases elastic stress wave rapidly when it is subjected to external force or deformation. The detected energy comes from the tested object itself, and it is a non-destructive testing method for judging the position, change degree and development trend of internal activity defects of materials or structures. In most cases, the effective frequency spectrum of its acoustic signal can extend to several megahertz or even tens of megahertz. Through the detection of acoustic signals, real-time transient or continuous signals that change with external variables such as load, time and temperature can be provided, which is suitable for process monitoring and early or near failure prediction. Acoustic emission signals can be divided into burst acoustic emission signals (for example, membrane crack) and continuous acoustic emission signals (for example, valve leakage) according to their time interval and the difficulty of signal differentiation. At present, due to its fast detection, high sensitivity, low requirement for the proximity of the tested workpiece, coincidence with the experience of valve fault judgment and predictability of early valve failure, it is widely used and rapidly developed with the development of pattern recognition methods such as artificial neural network. Acoustic emission is not sensitive to the geometry of the component, and almost all materials produce acoustic emission when deformed and fractured, which is suitable for online detection of valves in engine test sites.

[0066] The detection process of the above-mentioned vacuum chamber multi-point transmission fault detection system based on the pickup matrix includes the following steps:

[0067] S1, determine the fault judgment standard

[0068] The sound intensity threshold of the to-be-tested valve detection point of the to-be-tested valve 6 is A.

[0069] The sound pressure relative amplitude threshold for judging the type of acoustic emission signal is B, the distance between the to-be-tested valve detection point and the pickup matrix unit 2 is X, X≥3N, the sound pressure and the distance are in a linear relationship, and the wave source sound pressure relative amplitude is less than 0.4. In this embodiment, the pickup matrix is arranged at the center position 500 mm away from the valve, and the detection wave source sound pressure relative amplitude threshold B=0.4 is set. When the measured sound pressure relative amplitude is greater than 0.4, it is a burst acoustic emission signal, and when the measured sound pressure relative amplitude is less than 0.4, it is a continuous acoustic emission signal.

[0070] A valve with a leakage fault is used, the valve with a leakage fault is of the same type as the to-be-tested valve 6, and the standard curve of the sound intensity signal and the leakage amount is obtained by adjusting the inlet and outlet pressure of the valve at different temperatures; specifically including:

[0071] S1.1 determine the current temperature;

[0072] S1.2 adjust different leakage amounts by adjusting the inlet and outlet pressure of the valve, measure the sound intensity corresponding to different leakage amounts by the pickup matrix unit 2, and fit the standard curve of the sound intensity and the leakage amount at the current temperature according to the measurement results;

[0073] S1.3 Adjust the temperature, repeat step S1.2 to obtain the standard curve of sound intensity and leakage at the required temperature.

[0074] S2, Real-time detection

[0075] Before the engine test, the test valve detection point of the test valve 6 is connected with the vacuum chamber multi-point transmission fault detection system based on the sound pickup matrix.

[0076] Start the test and use the vacuum chamber multi-point transmission fault detection system based on the sound pickup matrix for real-time detection.

[0077] Use the valve parameter acquisition system to measure the temperature, vibration frequency and pressure of the inlet and outlet of the test valve 6 in real time.

[0078] Use the sound pickup matrix data acquisition system to collect the sound intensity and sound pressure relative amplitude of each test valve detection point of the test valve 6.

[0079] During real-time measurement, the vacuum degree in the vacuum chamber 3 is detected. When the vacuum degree is less than 7kpa, it is difficult for related interference signals to enter the vacuum measurement system due to the effect of vacuum. The sound through the sound guide vacuum pipe 4 can be well mapped on the sound mapping plate 1, and the mutual interference becomes smaller due to the vacuum environment around.

[0080] S3, Data judgment

[0081] S3.1 Use the data receiving and processing system to determine the sound intensity of the test valve detection point. If the sound intensity is less than or equal to A, the corresponding detection point of the test valve 6 is normal, and the test continues. If the sound intensity is greater than A, the corresponding detection point of the test valve 6 is faulty. The data receiving and processing system sends a fault signal to the early warning system, which issues an alarm for fault warning, and enters step S3.2.

[0082] S3.2 According to the sound pressure relative amplitude of the test valve detection point, if the sound pressure relative amplitude is greater than B, the sound signal is a burst acoustic emission signal, the test is suspended, the test valve 6 and the vacuum chamber multi-point transmission fault detection system based on the sound pickup matrix are closed, and the corresponding detection point is repaired or replaced with a valve.

[0083] If the sound pressure relative amplitude is less than or equal to B, the sound signal is a continuous acoustic emission signal, and step S3.3 is entered.

[0084] S3.3 uses the temperature, vibration frequency and pressure of the inlet and outlet of the valve 6 in the current test state, and the standard curve of the sound intensity signal and the leakage amount obtained in step S1 to obtain the leakage amount corresponding to the detection point of the valve to be tested according to the sound intensity; according to the preset leakage amount threshold k, if the leakage amount corresponding to the detection point of the valve to be tested is less than k, the test is continued; if the leakage amount corresponding to the detection point of the valve to be tested is greater than or equal to k, the test is suspended and the valve is repaired or replaced, which avoids the time delay caused by the shutdown of the test due to a small amount of leakage, improves the test efficiency, and avoids the test failure or accident caused by a large amount of leakage.

Claims

1. A vacuum chamber multi-point fault detection system based on a pickup matrix, used for real-time fault detection at multiple detection points of the valve under test (6), characterized in that: The system comprises a sound pickup matrix data acquisition system, a valve parameter acquisition system and a data receiving and processing system. The sound pickup matrix data acquisition system comprises a sound mapping plate (1), a sound pickup matrix unit (2), a vacuum chamber (3) and a plurality of sound guide vacuum tubes (4). The sound guide vacuum tube (4) comprises a cylindrical shell (41) and a sound transmission core (43) arranged inside the shell (41), and a vacuum layer (42) is formed around the sound transmission core (43). The sound mapping plate (1) is arranged on the vacuum chamber (3), and the sound mapping plate (1) has a plurality of first through holes, each of which is communicated with the vacuum chamber (3); a cylindrical sound insulation layer (11) is embedded in each first through hole, and a sound transmission layer (12) is embedded in the sound insulation layer (11). The first end of the sound guide vacuum tube (4) is connected to the corresponding valve detection point to be detected through a sound access element, and the end of the sound transmission core (43) abuts against the outer surface of the valve detection point to be detected. The second end of the sound guide vacuum tube (4) abuts against the corresponding sound transmission layer (12) on the sound mapping plate (1) through a connecting assembly, and the vacuum layer (42) is communicated with the vacuum chamber (3) through a vacuumizing hole (13) arranged in the sound transmission layer (12). The sound pickup matrix unit (2) is arranged in the vacuum chamber (3) and comprises a plurality of sound collection assemblies corresponding to the sound transmission layer (12), and the plurality of sound collection assemblies are respectively used for receiving sound signals transmitted by the sound transmission layer (12); the output end of the sound pickup matrix unit (2) is electrically connected with the data receiving and processing system; the distance between each valve detection point to be detected and the corresponding sound collection assembly is X, and X≥3N, where N is the length of the approach zone. The valve parameter acquisition system comprises a pressure measuring unit, a temperature measuring unit and a vibration measuring unit, and the pressure measuring unit, the temperature measuring unit and the vibration measuring unit are electrically connected with the data receiving and processing system, and are used for collecting pressure, temperature and vibration frequency data of the valve (6) to be detected in real time and transmitting the data to the data receiving and processing system.

2. The vacuum chamber multi-point transmission fault detection system based on the sound pickup matrix according to claim 1, wherein: The connecting assembly comprises a pressure bearing block (44), a fixed groove (46) and a movable groove (45); The fixed groove (46) is cylindrical and fixed on the sound transmission layer (12), and the end of the fixed groove (46) away from the sound transmission layer (12) is threadedly connected with the slot opening of the movable groove (45); The pressure bearing block (44) is fixed on the outer wall of the sound guide vacuum tube (4), and the bottom of the movable groove (45) is provided with a second through hole; the first end of the sound guide vacuum tube (4) penetrates through the second through hole, and the side of the pressure bearing block (44) away from the sound transmission layer (12) abuts against the inner surface of the bottom of the movable groove (45), so that the bottom of the movable groove (45) applies pressure to the pressure bearing block (44) during the threadedly rotating connection between the inner side of the movable groove (45) and the outer side of the fixed groove (46), thereby realizing the abutment between the second end of the sound guide vacuum tube (4) and the sound transmission layer (12). The sound access is a cylindrical structure and is fixed on the detection point of the valve to be tested, and the sound access is threadedly connected with the shell (41) of the first end of the sound guide vacuum tube (4).

3. The vacuum chamber multi-point transmission fault detection system based on the sound pickup matrix according to claim 1 or 2, characterized in that: It also comprises a pre-warning system for receiving the fault signal sent by the data receiving and processing system and sending an audible and visual warning.

4. The phonic-matrix-based vacuum-chamber multi-point delivery fault detection system of claim 3, wherein: The sound pickup frequency of the sound pickup matrix data acquisition system is 0-40 kHz.

5. The vacuum chamber multi-point transmission fault detection system based on the sound pickup matrix according to claim 4, characterized in that: The pressure measuring unit comprises pressure sensors arranged at the outlet and inlet of the valve to be tested (6), the temperature measuring unit comprises temperature sensors arranged at the outlet and inlet of the valve to be tested (6), and the vibration measuring unit comprises vibration sensors arranged at the outlet and inlet of the valve to be tested (6), and the output ends of the pressure sensors, temperature sensors and vibration sensors are electrically connected with the data receiving and processing system.

6. A vacuum chamber multi-point delivery fault detection method based on a pickup matrix, characterized in that, The vacuum chamber multi-point transmission fault detection system based on the sound pickup matrix according to any one of claims 1-5 comprises the following steps: S1, determining the fault judgment standard The preset sound intensity threshold of the valve to be tested (6) at the detection point of the valve to be tested is A; The preset sound pressure relative amplitude threshold for judging the sound emission signal type is B; A valve with a leakage fault is used, which is the same type as the valve to be tested (6), and the standard curve of sound intensity signal and leakage amount is obtained by adjusting the pressure at the inlet and outlet of the valve at different temperatures; S2, real-time detection Before the engine test, the detection point of the valve to be tested (6) is connected with the vacuum chamber multi-point transmission fault detection system based on the sound pickup matrix; Start the test and use the vacuum chamber multi-point transmission fault detection system based on the sound pickup matrix to perform real-time detection; The valve parameter acquisition system is used to measure the temperature, vibration frequency and pressure at the inlet and outlet of the valve to be tested (6) in real time; The sound pickup matrix data acquisition system is used to collect the sound intensity and sound pressure relative amplitude of each detection point of the valve to be tested (6); S3, data judgment S3.1 uses the data receiving and processing system to determine the sound intensity at the detection point of the valve to be tested, if the sound intensity is less than or equal to A, the corresponding detection point of the valve to be tested is normal, and the test continues; if the sound intensity is greater than A, the corresponding detection point of the valve to be tested is faulty, and step S3.2 is entered; S3.2 determines the sound pressure relative amplitude at the detection point of the valve to be tested, if the sound pressure relative amplitude is greater than B, the sound signal is a burst sound emission signal, the test is paused, the valve to be tested (6) and the vacuum chamber multi-point transmission fault detection system based on the sound pickup matrix are closed, and the corresponding detection point is repaired or the valve is replaced; If the sound pressure relative amplitude is less than or equal to B, the sound signal is a continuous sound emission signal, and step S3.3 is entered; S3.3 uses the temperature, vibration frequency and pressure at the inlet and outlet of the valve to be tested (6) in the current test state, and the standard curve of sound intensity signal and leakage amount obtained in step S1 to obtain the leakage amount of the corresponding detection point of the valve to be tested according to the sound intensity.

7. The vacuum chamber multi-point transmission fault detection method based on the pickup matrix according to claim 6, characterized in that: In step S2, the vacuum degree in the vacuum chamber (3) is detected in real time during the measurement process, and the vacuum degree is less than 7 kpa.

8. The vacuum chamber multi-point transmission fault detection method based on the pickup matrix according to claim 7, characterized in that: In step S1, a valve with a leakage fault is used, which is the same type as the valve (6) to be detected, and at different temperatures, the standard curve of the sound intensity signal and the leakage amount is obtained by adjusting the pressure at the inlet and outlet of the valve, specifically: S1.1 Determine the current temperature; S1.2 Adjust the different leakage amounts by adjusting the pressure at the inlet and outlet of the valve, and measure the sound intensity corresponding to the different leakage amounts by the pickup matrix unit (2), and fit the standard curve of the sound intensity and the leakage amount at the current temperature according to the measurement results; S1.3 Adjust the temperature and repeat step S1.2 to obtain the standard curve of the sound intensity and the leakage amount at each required temperature.

9. The vacuum chamber multi-point transmission fault detection method based on the pickup matrix according to claim 8, characterized in that: In step S3.3, it further includes: if the leakage amount corresponding to the detection point of the valve to be detected is less than the preset leakage amount threshold k, the test continues; if the leakage amount corresponding to the detection point of the valve to be detected is greater than or equal to the preset leakage amount threshold k, the test is suspended, and the valve is repaired or replaced.

10. The vacuum chamber multi-point transmission fault detection method based on the pickup matrix according to claim 9, characterized in that: In step S3.1, if the sound intensity is greater than A, the corresponding detection point of the valve to be detected is faulty, and the fault signal is sent to the early warning system through the data receiving and processing system, and the early warning system issues an alarm for fault warning.

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