Environmental simulation test system and test method for executing ultrasonic leak detection in normal pressure environment

Abstract

The embodiment of the invention provides an environmental simulation test system and test method for executing ultrasonic leak detection in a normal pressure environment, and the system comprises a vacuum container, an ultrasonic transmitting module, a sealing module, an ultrasonic detection module and a preset clamping object. The ultrasonic leak detection device can execute ultrasonic leak detection in a normal-pressure environment, can be used as a preventive maintenance means to detect whether leakage is caused by clamping objects at a sealing module (such as flange connection) of a vacuum container in a test preparation stage, namely the normal-pressure environment, so as to realize early discovery, early intervention and early elimination of vacuum leakage, and greatly shorten the detection time of vacuum detection required in the conventional technology.

Description

Technical Field

[0001] The embodiments of this specification relate to the technical field of aerospace equipment testing, and particularly to an environmental simulation test system for performing ultrasonic leak detection under normal pressure environment. Background Art

[0002] As the most time-consuming, most participating equipment, and most complex state test item in the development process of aerospace equipment, the vacuum thermal test of aerospace equipment has extremely high requirements for the reliability of the test process. Usually, the flange wire passing area is routinely inspected before the test. However, due to reasons such as a large number of cables and small shedding materials, it is difficult to find the shedding materials. Once not cleaned in time, the shedding materials will be clamped between the sealing ring and the sealing surface, resulting in vacuum leakage at the flange wire passing area, which may cause the vacuum degree in the container not to meet the standard during the test operation stage, and further cause the test and measurement equipment to operate unstably, the test to be insufficient, affecting the effectiveness of the thermal test performance assessment, and even causing the aerospace equipment to discharge, causing irreversible damage to the flight model equipment in the aerospace equipment.

[0003] It can be seen that the index of the test vacuum degree is crucial for the thermal balance test of aerospace equipment. Currently, container leak detection is carried out after the rough pumping stage is completed and before starting the high-vacuum equipment. However, once the leak rate is found to be too large, resulting in the difficulty of reducing the vacuum degree in the container to the target value, it is necessary to repressurize, open the container and reinstall the leaking point equipment, and then restart the rough pumping stage, which will cause the test progress to be delayed by at least 8 hours, seriously affecting the test progress. However, the prerequisite for the current leak detection means to detect leaks is that there must be a certain pressure difference between the inside and outside of the container, which is not applicable in the normal pressure environment. Summary of the Invention

[0004] In view of this, the embodiments of this specification provide a method for an environmental simulation test system for performing ultrasonic leak detection under normal pressure environment. One or more embodiments of this specification simultaneously relate to an environmental simulation test system device for performing ultrasonic leak detection under normal pressure environment, a computing device, a computer-readable storage medium, and a computer program to solve the technical defects existing in the prior art.

[0005] According to the first aspect of the embodiments of this specification, a method for an environmental simulation test system for performing ultrasonic leak detection under normal pressure environment is provided, including: A vacuum container, having a circumferentially closed side wall, fixed to the first end of the side wall to enclose the bottom of the chamber, an open end provided at the second end of the side wall, and a fixed edge provided at the open end; the side wall extends axially and encloses a hollow chamber for placing the aerospace equipment to be tested; the fixed edge is integrally formed or connected to the outer periphery of the open end, and the fixed edge extends radially outward and exceeds the edge of the open end; An ultrasonic emission module disposed at the bottom of a vacuum container includes: a sound generator fixing device fixedly connected to the bottom of the vacuum container through a rigid connection or a detachable structure, for providing an installation reference for the module; an ultrasonic sound generator mounted on the sound generator fixing device, including at least one ultrasonic transducer array, and the transducer array is configured to convert an electrical signal into mechanical vibration to emit ultrasonic waves; a driving signal sound generator electrically connected to the ultrasonic sound generator, including a high-frequency oscillation circuit and a power amplifier, for generating a driving signal adapted to the operating frequency of the transducer; a control and adjustment component integrated in the driving signal sound generator or independently packaged, for adjusting the output frequency, output power, and output channels of the ultrasonic waves. A sealing module is provided with a sealing body, a lapping portion, and a fixing structure; the shape of the sealing body is adapted to the interface profile of the open end, for covering and sealing the open end; the lapping portion extends outward from the outer edge of the sealing body to form a radially expanding area; the fixing structure is disposed on the lapping portion, for detachably fixedly connecting with the fixing edge of the vacuum container. An ultrasonic detection module is used to detect ultrasonic wave leakage. A preset object can be disposed at the gap between the outer surface of the fixing edge and the lower surface of the lapping portion, for simulating foreign objects that have appeared at the gap.

[0006] In some embodiments, the sealing body and the lapping portion are an integrally formed flange cover, the sealing body is a solid disk, and the lapping portion is radially provided with a plurality of screw holes. The fixing structure includes a fixing plate corresponding to the screw holes and a plurality of bolts. The fixing plate is coaxially fitted with the lapping portion and configured in any one of the following forms: A split structure, composed of a plurality of independent plate bodies, and each plate body is provided with a through hole corresponding to a single screw hole. An integral annular plate is provided with a plurality of threaded connection holes coaxial with the screw holes, for screwing bolts.

[0007] In some embodiments, the control and adjustment component includes: A frequency adjustment component for adjusting the ultrasonic output frequency. An intensity adjustment component for adjusting the ultrasonic output power. A channel adjustment component for switching or distributing ultrasonic emission channels, wherein the ultrasonic emission channels can be adjusted to multi-channel collaborative emission.

[0008] In some embodiments, the ultrasonic emission module further includes: A transducer fixing bracket is disposed between the sound generator fixing device and the ultrasonic sound generator, for positioning and stabilizing the vibration direction of the transducer array.

[0009] In some embodiments, the sealing structure further includes a correspondingly arranged sealing groove and a sealing ring, wherein, The sealing groove is a single-sided groove body formed on one side of the overlapping portion and / or the surface of the fixed edge facing each other, or a double-sided groove body respectively formed on the end surface of the overlapping portion and the corresponding end surface of the fixed edge; The sealing ring in interference fit with the sealing groove is used to be compressed and deformed when the fixing structure is locked, so as to block the gas leakage path between the overlapping portion and the fixed edge.

[0010] In some embodiments, the preset object to be clamped is one of the following: Wire-shaped object, single-layer cloth object, multi-layer cloth object, label object.

[0011] In some embodiments, the ultrasonic detection module includes: A receiving frequency adjustment component for dynamically adjusting the cut-off frequency of the band-pass filter; A display screen for real-time display of the ultrasonic capture result; A sound collecting device: for directional reception, signal conversion and optimization processing of sound waves.

[0012] In some embodiments, the system further includes: A power supply module, including a power supply transformer and a mobile power supply device; Wherein, the mobile power supply device is further provided with a power supply switch and a power supply socket.

[0013] According to the second aspect of the embodiments of the present specification, there is provided a test method for an environmental simulation test system for performing ultrasonic leak detection under normal pressure, including: Confirm that the vacuum container, ultrasonic emission module, sealing module, and ultrasonic detection module in the environmental simulation test system for performing ultrasonic leak detection under normal pressure are all normally installed, in a normal power-on or power-off state, and can work normally; Clean the aerospace equipment to be tested and each module in the system, and ensure that the environmental noise is less than the preset decibel value; Adjust the ultrasonic emission direction of the ultrasonic emission module so that the ultrasonic emission direction is perpendicular to the bottom surface of the aerospace equipment to be tested; Without placing the object to be clamped, use the ultrasonic detection module to detect ultrasonic leakage waves to ensure that there is no leakage in the background; Place the preset object to be clamped at the gap between the outer surface of the fixed edge and the lower surface of the overlapping portion; Divide the area to be tested into appropriate small areas. The area to be tested is the area where the sealing is different from the previous test or a preset area in this test, and the area of each small area does not exceed the preset value; Confirm that the ultrasonic emission module remains in the closed state. Place the ultrasonic detection module inside the vacuum container for testing. After the data stabilizes, record the ultrasonic value and determine it as the background value of the leak rate. Turn on the ultrasonic emission module, adjust it to the highest signal intensity, and turn on all emission channels. Align the ultrasonic detection module with the sound-emitting port, record the peak value, and confirm that the reading of the ultrasonic detection module is normal. Detect the corresponding area of the sealing module according to the preselected detection method, record and analyze the obtained detection data. Among them, the data record includes the location, size, and severity of the leakage. Use a marker pen or spray paint to mark the leakage point for subsequent repair. Determine again that the ultrasonic detection module is working properly and the detection data is valid, and determine the repair plan based on the detection data of the leakage point.

[0014] In some embodiments, the detection method includes a long-distance rough detection method and a short-distance precise detection method. Among them, The long-distance rough detection method includes: keeping the detection port of the ultrasonic detection module corresponding to the detected part, detecting the detected part through a first distance, the first distance being less than a preset first threshold, and the scanning detection rate being less than a preset first rate. The short-distance precise detection method includes: keeping the detection port of the ultrasonic detection module precisely corresponding to the detected part, detecting the detected part through a second distance, the second distance being within a preset second threshold range, and the scanning detection rate being less than a preset second rate.

[0015] At least one embodiment in the embodiments of this specification can perform ultrasonic leak detection in an atmospheric pressure environment by setting a vacuum container, an ultrasonic emission module, a sealing module, an ultrasonic detection module, and a preset clamping object. As a preventive maintenance measure, it can check whether there is a leakage caused by clamping objects at the sealing module (such as flange connection) of the vacuum container in the atmospheric pressure environment during the test preparation stage, so as to achieve early detection, early intervention, and early elimination of vacuum leakage, greatly shortening the detection time required for detecting true vacuum in conventional technologies. Description of the Drawings

[0016] Figure 1 is a simple structural schematic diagram of an environmental simulation test system for performing ultrasonic leak detection in an atmospheric pressure environment provided by some embodiments of this specification; Figure 2 is a schematic diagram of one side of the sealing module in an environmental simulation test system for performing ultrasonic leak detection in an atmospheric pressure environment provided by some embodiments of this specification; Figure 3 is a flowchart of some embodiments of an environmental simulation test method for performing ultrasonic leak detection in an atmospheric pressure environment provided by some embodiments of this specification.

[0017] Among them, each reference numeral in the figures: Detailed implementation manners

[0018] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although some embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not used to limit the protection scope of the present disclosure.

[0019] In addition, it should be noted that for the sake of convenience of description, only parts related to the present disclosure are shown in the drawings. Without conflict, the embodiments in the present disclosure and the features in the embodiments can be combined with each other.

[0020] Furthermore, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present disclosure, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0021] In the present disclosure, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected to", "fixed" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0022] In the present disclosure, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0023] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0024] In addition, the orientation or positional relationship indicated by "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present disclosure.

[0025] The present disclosure will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0026] As Figure 1 shown, in some embodiments of the embodiments of the present invention, an environmental simulation test system for performing ultrasonic leak detection in an atmospheric pressure environment is provided, including: A vacuum container 200, having a circumferentially closed side wall, fixed to the first end of the side wall to close the bottom of the chamber, an open end provided at the second end of the side wall, and a fixed edge provided at the open end (not shown in the figure); the side wall extends axially and encloses a hollow chamber for placing the space equipment to be tested; the fixed edge is integrally formed or connected to the outer periphery of the open end, and the fixed edge extends radially outward and exceeds the edge of the open end. The radial cross-section of the vacuum container 200 is circular, rectangular, diamond-shaped, polygonal or other shapes, which are set as required. The vacuum container 200 is used to accommodate the space equipment to be tested and other functional modules, and its interior can be evacuated to simulate a specific space environment. The side wall of the vacuum equipment and / or can be made of various metals, alloys, chemical composite materials, etc. that can withstand high pressure, which are selected as required. The space equipment to be tested can refer to satellite components, thrusters or specific sensors, etc., which are components that need to be tested for performance in a simulated vacuum or specific environment.

[0027] The ultrasonic emission module 100 disposed at the bottom of the vacuum container 200 includes: a sound generator fixing device 1001, which is fixed to the bottom of the vacuum container 200 through a rigid connection or a detachable structure and is used to provide an installation reference for the module; an ultrasonic sound generator 1002, which is installed on the sound generator fixing device 1001 and includes at least one ultrasonic transducer array. The transducer array is configured to convert an electrical signal into mechanical vibration to emit ultrasonic waves; a drive signal generator, which is electrically connected to the ultrasonic sound generator 1002 and includes a high-frequency oscillation circuit and a power amplifier and is used to generate a drive signal adapted to the operating frequency of the transducer; a control and adjustment component, which is integrated in the drive signal generator or independently packaged and is used to adjust the output frequency, output power, and output channel of the ultrasonic waves. The ultrasonic transducer array may refer to an aggregate composed of multiple ultrasonic transducers, which enhances the sound field coverage range or realizes directional emission through collaborative work. The ultrasonic sound generator 1002 can provide an effective and stable ultrasonic sound source 1006, which can fully and evenly cover every area inside the vacuum container 200 with ultrasonic waves. As a specific example, the output frequency of the ultrasonic sound generator 1002 can be adjusted to 40 kHz.

[0028] The sealing module 300 is provided with a sealing main body 3002, a lapping portion 3005, and a fixing structure 3001; the shape of the sealing main body 3002 is adapted to the interface profile of the open end and is used to cover and seal the open end; the lapping portion 3005 extends outward from the outer edge of the sealing main body 3002 to form a radially expanded area; the fixing structure 3001 is disposed on the lapping portion 3005 and is used for detachably and fixedly connecting with the fixed edge of the vacuum container 200. The ultrasonic sound source 1006 emitted by the ultrasonic emission module 100 may pass through the gap between the lapping portion 3005 and the fixed edge due to foreign objects clamped therein, thereby generating leakage ultrasonic waves 1007.

[0029] The ultrasonic detection module 500 is used to detect ultrasonic wave leakage.

[0030] As a specific example, the frequency range of the signals collected by the ultrasonic detection module 500 can be 36 kHz - 44 kHz. It can be set to 40 kHz during the detection process.

[0031] The preset clamping object 400 can be disposed at the gap between the outer surface of the fixed edge and the lower surface of the lapping portion 3005 and is used to simulate foreign objects that have appeared at the gap. The clamping object 400 is a wire-type object, a single-layer cloth object, a multi-layer cloth object, a label object, or other objects that may block the fixing structure 3001 during the test. As an example, the foregoing objects can be thermocouple wires, cloth strips, multi-layers, labels, or other objects that may block the fixing structure 3001 during the test.

[0032] In some alternative implementation manners, the system further includes: a power supply module, including a power supply transformer and a mobile power supply device; wherein, the mobile power supply device is further provided with a power supply switch and a power supply socket.

[0033] The beneficial effects of one of the embodiments in this specification at least include: by providing a vacuum container 200, an ultrasonic emission module 100, a sealing module 300, an ultrasonic detection module 500, and an inclusion 400, ultrasonic leak detection can be performed in an atmospheric pressure environment. As a preventive maintenance measure, it can check whether there is leakage caused by inclusions at the sealing module 300 (such as flange connection) of the vacuum container 200 in the atmospheric pressure environment during the test preparation stage, so as to achieve early detection, early intervention, and early elimination of vacuum leakage, greatly shortening the detection time required for vacuum detection in conventional technologies.

[0034] The sealing main body 3002 and the overlapping portion 3005 can be two integrally formed parts or two fixedly connected parts. Therefore, as Figure 2 shown, in some alternative implementation manners, the sealing main body 3002 and the overlapping portion 3005 are an integrally formed flange cover, the sealing main body 3002 is a solid disk, and the overlapping portion 3005 is radially provided with a plurality of screw holes 3006; the fixing structure 3001 includes a fixing plate corresponding to the screw holes 3006 and a plurality of bolts 3004; the fixing plate is coaxially matched with the overlapping portion 3005 and is configured in any of the following forms: The first one is a split structure, which is composed of a plurality of independent plate bodies, and each plate body is provided with a through hole corresponding to a single screw hole 3006. The split plate bodies can be individually disassembled or replaced, which is convenient for maintenance or local sealing compensation for specific screw hole 3006 positions, reducing the overall maintenance cost; stress dispersion: the multiple plate bodies independently bear force, which can avoid the deformation risk of the overall structure caused by local pressure concentration and improve the long-term stability.

[0035] The second one is an integral ring plate, which is provided with a plurality of threaded connection holes coaxial with the screw holes 3006 for screwing the bolts 3004.

[0036] The overall structure of the integral ring plate structure reduces the number of joints. Combined with the design of the sealing ring 3003, it can effectively prevent gas and ensure pressure stability. The annular continuous plate body enhances the overall compressive and anti-vibration capabilities and is more suitable for long-term use in the harsh environment in the embodiments of the present invention.

[0037] In some selected implementation manners, the control and adjustment assembly includes: a frequency adjustment component 1003, which is used to adjust the ultrasonic output frequency to adapt to the frequency adjustment requirements during the operation of the system.

[0038] The intensity adjustment component 1004 is used to adjust the ultrasonic output power to adapt to the adjustment requirements for signal intensity during system operation.

[0039] The channel adjustment component 1005 is used to switch or allocate ultrasonic emission channels. Among them, the ultrasonic emission channels can be adjusted to multi-channel collaborative emission to adapt to various adjustment requirements for signal emission channels during system operation.

[0040] In some selected embodiments, the ultrasonic emission module 100 further includes: The transducer fixing bracket is arranged between the sound generator fixing device 1001 and the ultrasonic sound generator 1002 and is used to position and stabilize the vibration direction of the transducer array.

[0041] In some alternative implementation manners, the sealing structure further includes a correspondingly arranged sealing groove and a sealing ring 3003.

[0042] The sealing groove is a single-sided groove body opened on the overlapping portion 3005 and / or one side of the fixed edge surface facing each other, or a double-sided groove body respectively opened on the end surface of the overlapping portion 3005 and the corresponding end surface of the fixed edge, which is set according to needs.

[0043] The sealing ring 3003 in interference fit with the sealing groove is used to be compressed and deformed when the fixing structure 3001 is locked to block the gas leakage path between the overlapping portion 3005 and the fixed edge.

[0044] In some alternative implementation manners, the ultrasonic detection module includes: The receiving frequency adjustment component 501 is used to dynamically adjust the cut-off frequency of the band-pass filter.

[0045] The display screen 502 displays the ultrasonic capture results in real time.

[0046] The sound collecting device 503: directional reception, signal conversion and optimization processing of sound waves.

[0047] As Figure 3 shown, in some other embodiments of the embodiments of the present invention, an environmental simulation test method for performing ultrasonic leak detection under normal pressure environment is provided. This method is applied to the system described above, and the method includes: Step 301: Confirm that the vacuum container 200, ultrasonic emission module 100, sealing module 300, and ultrasonic detection module 500 in the environmental simulation test system for ultrasonic leak detection under normal atmospheric pressure are all properly installed, in a normal power-on or power-off state, and can operate normally. By ensuring that the core modules of the ultrasonic leak detection system (vacuum container 200, ultrasonic emission / detection module, sealing module 300) are correctly installed and powered, a stable and reliable basic environment is provided for subsequent tests, avoiding test failures or data deviations caused by equipment abnormalities.

[0048] Step 302: Clean each module in the space equipment to be tested and its system, and ensure that the environmental noise is less than the preset decibel value. By cleaning the surfaces of the equipment and modules, the interference of impurities on ultrasonic propagation is eliminated; by controlling the environmental noise below the preset decibel value, the masking effect of external noise on the detection signal is reduced, and the detection accuracy is improved.

[0049] Step 303: Adjust the ultrasonic emission direction of the ultrasonic emission module 100 so that the ultrasonic emission direction is perpendicular to the bottom surface of the space equipment to be tested.

[0050] Step 304: Without placing the clamp 400, use the ultrasonic detection module 500 to detect ultrasonic leakage waves to ensure that there is no leakage in the background. By vertically emitting ultrasonic waves, the acoustic wave energy acts on the area to be tested to the greatest extent, reducing signal attenuation caused by angle deviation and enhancing the sensitivity of leakage detection. Testing the background leakage waves of the system in the state without the clamp to establish a baseline reference value, excluding system self-interference (such as background noise or inherent vibration of the container), and ensuring the validity of subsequent clamp test data.

[0051] Step 305: Place the preset clamp 400 at the gap between the outer surface of the fixed edge and the lower surface of the overlapping part 3005. To verify the response ability of the ultrasonic detection module 500 to the leakage of the clamp 400 and provide a standard test sample for quantitative analysis of the leakage degree.

[0052] Step 306: Divide the area to be tested into appropriate small areas. The area to be tested is the area where the sealing is different from the previous test or a preset area in this test, and the area of each small area does not exceed the preset value. Subdividing the area to be tested into small area units is convenient for focusing on detecting local sealing defects, especially suitable for differential areas, and improving the detection efficiency and positioning accuracy.

[0053] Step 307: Confirm that the ultrasonic emission module 100 remains in the closed state, place the ultrasonic detection module 500 inside the vacuum container 200 for testing, and record the ultrasonic value and determine it as the background leakage rate value after the data is stable. Measuring the background value when the ultrasonic emission module 100 is closed to clarify the inherent noise level of the system, providing a benchmark for the threshold determination of subsequent leakage signals and avoiding misjudgment or missed detection.

[0054] Step 308: Turn on the ultrasonic emission module 100, adjust it to the highest signal intensity, turn on all emission channels, align the ultrasonic detection module 500 with the sound-emitting port, record the peak value, and confirm that the reading of the ultrasonic detection module 500 is normal. By emitting ultrasonic waves at full power and recording the peak signal, verify the response ability and signal intensity adaptability of the ultrasonic detection module 500 to ensure that the device is in the best working state.

[0055] Step 309: Detect the corresponding area of the sealing module 300 according to the preselected detection method, record and analyze the obtained detection data. Among them, data recording includes the location, size, and severity of the leakage. The system records key parameters such as the leakage location, size, and severity, providing a quantitative basis for the sealing performance evaluation and supporting the subsequent repair priority ranking and process improvement.

[0056] Step 310: Use a marker pen or spray paint to mark the leakage point for subsequent repair. Intuitively identify the leakage point through physical markings (such as spray paint or marks), facilitating subsequent rapid positioning and defect repair, reducing rework time, and improving the repair efficiency.

[0057] Step 311: Determine again that the ultrasonic detection module 500 is working properly and the detection data is valid, and determine the repair plan based on the detection data of the leakage point.

[0058] In some optional implementation manners, the detection method includes a long-distance rough detection method and a short-distance precise detection method. Among them, the long-distance rough detection method includes: keeping the detection port of the ultrasonic detection module 500 corresponding to the detected part, detecting the detected part through a first distance, the first distance being less than a preset first threshold, and the scanning detection rate being less than a preset first rate. As a specific example, the first threshold can be 3 cm. The first rate can be 2 cm / s.

[0059] The short-distance precise detection method includes: keeping the detection port of the ultrasonic detection module 500 precisely corresponding to the detected part, detecting the detected part through a second distance, the second distance being within a preset second threshold range, and the scanning detection rate being less than a preset second rate. As a specific example, the second threshold range can be from 80 cm to 120 cm. The second rate can be 2.5 cm / s. It should be noted that the first rate and the second rate can be the same or different. However, there is no intersection between the first threshold and the second threshold range.

[0060] Obviously, quickly lock the suspected defect area through long-distance and high-speed scanning, which is suitable for the preliminary screening of large areas or non-critical parts, with high screening efficiency and reduced probability of missed detection.

[0061] The near-distance precise inspection method can identify inspections of finer regions, and is particularly applicable to the marked high-risk parts in the embodiments of the present invention.

[0062] The preferred embodiments of the present specification disclosed above are only used to help explain the present specification. The alternative embodiments do not describe all the details in detail, nor do they limit the invention to only the specific implementation manners. Obviously, according to the content of the embodiments of the present specification, many modifications and changes can be made. The present specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the embodiments of the present specification, so that those skilled in the art can well understand and utilize the present specification. The present specification is only limited by the claims and their full scope and equivalents.

Claims

1. An environmental simulation test system for performing ultrasonic leak detection under normal pressure environment, characterized in that: include: A vacuum container, comprising a circumferentially closed side wall, fixed to a first end of the side wall to close a chamber bottom, an open end arranged at a second end of the side wall, and a fixed edge arranged at the open end; the side wall extends axially and encloses a hollow chamber for placing a space equipment to be tested; the fixed edge is integrally formed or connected to the outer periphery of the open end, and the fixed edge extends radially outward and exceeds the edge of the open end; ‌ The ultrasonic transmitting module arranged at the bottom of the vacuum container comprises: a sound generator fixing device, fixed to the bottom of the vacuum container by a rigid connection or a detachable structure, and used to provide a mounting reference for the module; an ultrasonic sound generator, installed on the sound generator fixing device, comprising at least one ultrasonic transducer array, wherein the transducer array is configured to convert an electrical signal into a mechanical vibration to emit an ultrasonic wave; a driving signal sound generator, electrically connected to the ultrasonic sound generator, comprising a high-frequency oscillation circuit and a power amplifier, and used to generate a driving signal adapted to the operating frequency of the transducer; a control and adjustment component, integrated in the driving signal sound generator or independently packaged, and used to adjust the output frequency, output power and output channel of the ultrasonic wave; The sealing module comprises a sealing body, an overlapped portion and a fixing structure; the shape of the sealing body is adapted to the interface profile of the open end, and is used to cover and seal the open end; the overlapped portion extends outward from the outer edge of the sealing body to form a radial expansion area; the fixing structure is arranged at the overlapped portion, and is used to be detachably fixedly connected with the fixed edge of the vacuum container; Ultrasonic detection module, used to detect ultrasonic leakage waves; The preset clip can be arranged in the gap between the outer surface of the fixed edge and the lower surface of the overlap portion to simulate the foreign matter that has appeared in the gap.

2. The system according to claim 1, characterized in that The sealing body and the overlapping part are an integrally formed flange cover, the sealing body is a solid disk, and the overlapping part is radially provided with a plurality of screw holes; The fixing structure comprises a fixing plate corresponding to the screw holes and a plurality of bolts; The fixing plate is coaxially matched with the overlapping portion and is configured in any of the following forms: ‌Split structure‌, consisting of multiple independent plates, each of which is provided with a through hole corresponding to a single screw hole; The one-piece annular plate is provided with a plurality of threaded connection holes coaxial with the screw holes for screwing the bolts.

3. The system according to claim 1, characterized in that The control and adjustment component comprises: Frequency adjustment component, used to adjust the ultrasonic output frequency; ‌Intensity adjustment component‌, used to adjust the ultrasonic output power; The channel adjustment component is used to switch or allocate ultrasonic transmission channels, wherein the ultrasonic transmission channels can be adjusted to multi-channel coordinated transmission.

4. The system according to claim 1, characterized in that The ultrasonic transmitting module also includes: The transducer fixing bracket is arranged between the sound generator fixing device and the ultrasonic sound generator, and is used to locate and stabilize the vibration direction of the transducer array.

5. The system according to claim 1, characterized in that The sealing structure also includes a corresponding sealing groove and a sealing ring, wherein: The sealing groove is a single-sided groove body opened on the overlapping portion and / or the fixed edge surface facing each other, or a double-sided groove body opened on the end surface of the overlapping portion and the corresponding end surface of the fixed edge respectively; The sealing ring which is interference-fitted with the sealing groove is used to be compressed and deformed when the fixing structure is locked, so as to block the gas leakage path between the overlapping portion and the fixing edge.

6. The system according to claim 1, characterized in that The preset clip is one of the following: Wire-type objects, single-layer cloth objects, multi-layer cloth objects, label objects.

7. The system according to claim 1, characterized in that The ultrasonic detection module comprises: A receiving frequency adjustment component, used for dynamically adjusting the cutoff frequency of the bandpass filter; Display screen, showing ultrasonic capture results in real time; Sound collection device: directional reception of sound waves, signal conversion and optimization processing.

8. The system according to claim 1, characterized in that The system further comprises: Power supply module, including power supply transformer and mobile power supply equipment; Wherein, the mobile power supply device is also provided with a power supply switch and a power supply socket.

9. An environmental simulation test method for performing ultrasonic leak detection under normal pressure environment, characterized in that: The method is applied to the system according to any one of claims 1 to 8, and the method comprises: Confirm that the vacuum container, ultrasonic transmitting module, sealing module, and ultrasonic detection module in the environmental simulation test system for performing ultrasonic leak detection under normal pressure environment are properly installed, in a normal power-on or power-off state, and can work normally; Clean the aerospace equipment to be tested and each module in the system, and ensure that the environmental noise is less than the preset decibel value; Adjusting the ultrasonic emission direction of the ultrasonic emission module so that the ultrasonic emission direction is perpendicular to the bottom surface of the aerospace equipment to be tested; Without placing any objects, the ultrasonic detection module is used to detect ultrasonic leakage waves to ensure that there is no leakage in the background; Placing a preset clamp in the gap between the outer surface of the fixed edge and the lower surface of the overlap portion; Divide the area to be tested into appropriate small areas, where the area to be tested is the area with different sealing between this test and the previous test or the preset area, and the area of ​​each small area does not exceed the preset value; Make sure the ultrasonic transmitter module remains turned off, place the ultrasonic detection module into the vacuum container for testing, and record the ultrasonic value after the data stabilizes and determine it as the background value of the leak rate; Turn on the ultrasonic transmitting module, adjust it to the highest signal strength and open all transmitting channels, aim the ultrasonic detection module at the sound outlet, record the peak value and confirm that the ultrasonic detection module reading is normal; Inspecting the corresponding area of ​​the sealing module according to a preselected inspection method, and recording and analyzing the obtained inspection data, wherein the data record includes the location, size and severity of the leak; Use a marker or spray paint to mark the leak for easy repair; It is again confirmed that the ultrasonic detection module is working properly and the detection data is valid, and a repair plan is determined based on the detection data of the leakage point.

10. The method according to claim 9, characterized in that The detection method includes a long-distance rough detection method and a short-distance fine detection method, wherein: The long-distance rough inspection method includes: keeping the detection port of the ultrasonic detection module corresponding to the detected part, detecting the detected part at a first distance, the first distance is less than a preset first threshold, and the scanning detection rate is less than a preset first rate; The close-range precision inspection method includes: keeping the detection port of the ultrasonic detection module precisely corresponding to the detected part, detecting the detected part at a second distance, the second distance is within a preset second threshold range, and the scanning detection rate is less than a preset second rate.

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