Leakproofness detection method and system for protective equipment

Abstract

The invention relates to the technical field of leakproofness detection, in particular to a leakproofness detection method and system for protective equipment. A pressure-difference-free environment is formed inside and outside the detected protection equipment, an ultrasonic transmitting device is arranged inside the detected protection equipment, and a receiving device is arranged outside the detected protection equipment; the transmitting device is used for transmitting ultrasonic waves, the receiving device is used for capturing and recording ultrasonic signals from leakage points through the ultrasonic imaging technology, and then the number and the positions of the leakage points are determined; for each detected point-like leakage point, the leakage aperture size is estimated through a first formula according to the sound pressure level of the ultrasonic signal and the distance between the imaging equipment and the leakage point, then the air leakage amount under the flow method test pressure is calculated through a second formula according to the estimated leakage aperture size, and the air leakage amount is compared with a preset qualified index; compared with a traditional flow method, the method has the advantages that the efficiency is higher, the position of the leakage point can be accurately positioned, and the operation is simple, so that the reliability and the efficiency of airtightness detection of the protective equipment are improved.

Description

Technical Field

[0001] The present application relates to the technical field of airtightness detection, and in particular to a method and system for airtightness detection of protective equipment. Background Art

[0002] With the development of society and the improvement of safety awareness, the sealing performance of civil air defense protection equipment and facilities has become one of the important factors to ensure safety. Especially in the case of war or natural disasters, the sealing performance of civil air defense projects is directly related to the life safety of personnel. Therefore, it is very important to develop an efficient and reliable sealing performance detection method.

[0003] At present, the "flow method" is commonly used to test the airtightness of protective equipment and facilities in civil air defense projects. This method evaluates the airtightness by blocking the back side of the door frame wall of the civil air defense door to be tested at the project site, then inflating and pressurizing it, and testing the amount of air leakage. However, this method has some limitations.

[0004] The flow method takes a long time to test the airtightness. It usually takes 1 to 2 hours to test a single civil air defense door. When testing large double-leaf civil air defense doors, it is difficult to form an airtight chamber. In addition, the flow method can only quantitatively test the amount of air leakage, and it is impossible to know the specific location of the air leakage point. This makes it difficult to deal with the problem after the airtightness is found to be unqualified. This situation needs to be further improved. Summary of the invention

[0005] In order to solve the problems of low detection efficiency and inability to accurately locate leakage points in the prior art, the present application provides a method and system for detecting the tightness of protective equipment, which adopts the following technical solutions: In a first aspect, the present application provides a method for detecting the tightness of protective equipment, comprising the following steps: An ultrasonic transmitting device is arranged inside the protective equipment to be tested, and an ultrasonic receiving device is arranged outside, so that a pressure difference-free environment is formed inside and outside the protective equipment; Use an ultrasonic transmitter to transmit ultrasonic waves inside the protective equipment, and use an ultrasonic receiver to capture and record ultrasonic signals from air leakage points through ultrasonic imaging technology to determine the number and location of leakage points; For each detected point-shaped leak, the leak aperture size is estimated by the first formula according to the sound pressure level of the ultrasonic signal and the distance between the imaging device and the leak; According to the estimated leakage aperture size, the leakage volume under the corresponding test pressure of the flow method is calculated by the second formula, and compared with the preset qualified indicators to determine whether it meets the requirements.

[0006] By adopting the above-mentioned technical scheme, in order to overcome the problems in the prior art that the sealing performance detection of the flow method is time-consuming, complicated to operate and cannot accurately locate the leakage point, the present application provides a sealing detection method for protective equipment, which forms a pressure difference-free environment inside and outside the protective equipment to be detected, and an ultrasonic transmitting device is arranged inside and a receiving device is arranged outside; the transmitting device is used to transmit ultrasonic waves, and the receiving device is used to capture and record ultrasonic signals from the leakage point through ultrasonic imaging technology to determine the number and position of the leakage points; for each detected point leakage point, the leakage aperture size is estimated by a first formula according to the sound pressure level of the ultrasonic signal and the distance between the imaging device and the leakage point, and then the leakage volume under the flow method test pressure is calculated by a second formula according to the estimated leakage aperture size, and compared with the preset qualified index to determine whether it meets the requirements. Compared with the traditional flow method, the detection efficiency is higher, the leakage point can be accurately located, and the operation is simpler, which helps to improve the reliability and efficiency of the sealing detection of the protective equipment.

[0007] Optionally, after estimating the leakage aperture size by the first formula, the method further comprises the following steps: Determine the obvious leakage point based on the estimated leakage aperture size and the shape of the leakage point; Any obvious leakage points detected are temporarily blocked and ultrasonic testing is performed again until there are no obvious leakage points.

[0008] By adopting the above technical scheme, since the existence of a large leakage aperture will cause a large amount of air leakage and affect the detection accuracy, the present application first determines the obvious large-aperture leakage points according to the leakage aperture size and the leakage point shape; then these obvious leakage points are temporarily blocked, and the ultrasonic detection is repeated until there are no obvious leakage points. By blocking the large-aperture leakage points first, the leakage volume can be effectively reduced and the accuracy of subsequent small-aperture leakage point detection can be improved; at the same time, the operation is simple and will not affect the overall detection process, so it can further improve the reliability and efficiency of tightness detection.

[0009] Optionally, an ultrasonic transmitter is used to transmit ultrasonic waves inside the protective device, and an ultrasonic receiver is used to capture and record ultrasonic signals from air leakage points through ultrasonic imaging technology to determine the number and location of the leakage points, which specifically includes the following steps: An ultrasonic transmitter is used to transmit ultrasonic waves inside the protective equipment, and an ultrasonic receiver is used to capture and record ultrasonic signals from air leakage points through ultrasonic imaging technology, and a sound level spectrum is generated based on the ultrasonic signals; Based on the sound level spectrum, a sound distribution image is calculated and the sound distribution image is superimposed on the actual scene image to obtain a superimposed image; Identify the locations of the leak points from the overlay image and record the number and location coordinates of the leak points.

[0010] By adopting the above-mentioned technical scheme, the present application first uses an internal ultrasonic transmitting device to transmit ultrasonic waves, and uses an external receiving device to capture and record ultrasonic signals from the leakage point through ultrasonic imaging technology, and generates a sound level spectrum based on these signals; then, based on the obtained sound level spectrum, the distribution image of the sound in space is calculated, and the sound distribution image is superimposed on the image of the actual detected scene to obtain a superimposed comprehensive image; finally, the specific position coordinates of each leakage point are accurately identified from this superimposed image and recorded, which can intuitively and accurately display the position distribution of all leakage points, greatly improving the reliability and accuracy of leakage point identification.

[0011] Optionally, according to the estimated leakage aperture size, the gas leakage under the corresponding test pressure of the flow method is calculated by the second formula, and compared with the preset qualified index to determine whether it meets the requirements, which specifically includes the following steps: According to the estimated leakage aperture size of each point leakage aperture, the leakage volume under the corresponding test pressure of the flow method is calculated by the second formula; According to the leakage volume of each point leakage aperture, the estimated value of the cumulative leakage volume of all point leakage apertures is obtained; Compare the estimated value of the accumulated air leakage with the preset qualified index under the corresponding test pressure of the flow method to determine whether it meets the requirements; If the qualified indicators are not met, the flow method is used for further verification and judgment.

[0012] By adopting the above technical scheme, the present application first calculates the leakage volume under the flow method test pressure according to the aperture size of each leakage point; then accumulates the leakage volume of all leakage points to obtain an estimated value of the total leakage volume; compares this estimated value with the preset qualified index to preliminarily determine whether it meets the requirements; for unqualified cases, the flow method is used for further verification and judgment, which can quickly obtain preliminary qualified assessment results, and the flow method verification can be performed again for unqualified cases, thereby improving the detection efficiency and ensuring the reliability of the results.

[0013] Optionally, the first formula is: Where D is the size of the leakage aperture, P is the measured value of the sound pressure level, P0 is the reference value of the sound pressure level, which is the measured value of the sound pressure level at a distance of 1m from a reference hole with an aperture of 1mm, and R represents the distance between the imaging device and the leakage point.

[0014] By adopting the above-mentioned technical solution, since it is necessary to accurately estimate the leakage aperture size based on the ultrasonic signal, this application uses the difference between the actual sound pressure level value and the reference sound pressure level value, combined with the distance between the imaging device and the leakage point, to establish a formula model for estimating the leakage aperture size, which can well reflect the typical sound pressure levels corresponding to different aperture sizes, thereby improving the estimation accuracy.

[0015] Optionally, the second formula is: Among them, q is the leakage, Δp is the preset static pressure difference, ρ is the air density under standard conditions, and π is the pi.

[0016] By adopting the above-mentioned technical scheme, the present application utilizes the basic principles of fluid flow to establish a formula model that can calculate the leakage volume by inputting parameters such as pore size and pressure difference. This model can accurately calculate the leakage volume of each leakage point under the specified pressure difference, and provide data support for the subsequent judgment of whether the sealing performance is qualified.

[0017] Optionally, after determining whether the requirements are met, the method further includes: If it does not meet the requirements, a troubleshooting operation is performed, which includes checking the installation status of the protective equipment and performing a quality status inspection on the seals of the protective equipment; If it is still unqualified after elimination, the seal will be tested for compression reaction force, compression permanent deformation and aging coefficient to determine the root cause of the problem.

[0018] By adopting the above technical scheme, since in some cases, even if the above detection method is adopted, the sealing performance of the protective equipment may still be unqualified, when the test results show that the sealing performance of the protective equipment is unqualified, this application first checks whether there are problems with the overall installation status of the equipment, and at the same time inspects and detects the quality status of the seal to eliminate leakage caused by installation or quality problems; if the sealing performance is still unqualified after the above inspection, it is necessary to conduct further compression reaction force test, compression permanent deformation test and aging coefficient test on the seal itself, so as to comprehensively evaluate the performance of the seal and find out the root cause of the unqualified sealing, so as to comprehensively and accurately judge the cause of the unqualified sealing, and provide a clear basis for subsequent corrective measures.

[0019] In a second aspect, the present application provides a sealing detection system for protective equipment, comprising: An ultrasonic emitting device, used for emitting ultrasonic waves inside the protective equipment to be detected; An ultrasonic receiving device, including an ultrasonic imager, for capturing and recording ultrasonic signals from an air leakage point; A control system for controlling ultrasonic emission and reception; The data analysis unit is used to perform the following steps: According to the ultrasonic signal, determine the number and location of the leakage points; For each detected point-shaped leak, the leak aperture size is estimated by the first formula according to the sound pressure level of the ultrasonic signal and the distance between the imaging device and the leak; According to the estimated leakage aperture size, the leakage volume under the corresponding test pressure of the flow method is calculated by the second formula, and compared with the preset qualified indicators to determine whether it meets the requirements.

[0020] Optionally, also include: User interface device, used for operators to set test parameters and view results.

[0021] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present application provides a method for detecting the tightness of protective equipment, wherein a pressure-free environment is formed inside and outside the protective equipment to be detected, an ultrasonic transmitter is arranged inside, and a receiving device is arranged outside; the transmitter is used to transmit ultrasonic waves, and the receiving device is used to capture and record ultrasonic signals from leakage points through ultrasonic imaging technology to determine the number and position of leakage points; for each detected point leakage point, the leakage aperture size is estimated by a first formula according to the sound pressure level of the ultrasonic signal and the distance between the imaging device and the leakage point, and then the leakage volume under the flow method test pressure is calculated by a second formula according to the estimated leakage aperture size, and compared with the preset qualified index to determine whether it meets the requirements. Compared with the traditional flow method, the detection efficiency is higher, the leakage point position can be accurately located, and the operation is simpler, which helps to improve the reliability and efficiency of the tightness detection of protective equipment; 2. Since the existence of a large leakage aperture will cause a large amount of air leakage, affecting the detection accuracy, the present application first determines the obvious large-aperture leakage points according to the leakage aperture size and the shape of the leakage point; then temporarily blocks these obvious leakage points, and repeats the ultrasonic detection until there are no obvious leakage points. By first blocking the large-aperture leakage points, the leakage volume can be effectively reduced, and the accuracy of subsequent small-aperture leakage point detection can be improved; at the same time, the operation is simple and will not affect the overall detection process, so the reliability and efficiency of the tightness detection can be further improved; 3. The present application first uses an internal ultrasonic transmitting device to transmit ultrasonic waves, and uses an external receiving device to capture and record ultrasonic signals from the leakage point through ultrasonic imaging technology, and generates a sound level spectrum based on these signals; then, based on the obtained sound level spectrum, the distribution image of the sound in space is calculated, and the sound distribution image is superimposed on the image of the actual detected scene to obtain a superimposed comprehensive image; finally, the specific location coordinates of each leakage point are accurately identified from this superimposed image and recorded, which can intuitively and accurately display the location distribution of all leakage points, greatly improving the reliability and accuracy of leakage point identification. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a flow chart of a method for detecting airtightness of protective equipment according to an embodiment of the present application; Figure 2 It is a schematic diagram of transmitting and receiving ultrasonic waves in a method for detecting tightness of protective equipment according to an embodiment of the present application; Figure 3 It is a schematic diagram of a process for treating obvious leakage points using a tightness detection method for protective equipment according to an embodiment of the present application; Figure 4 It is a flow chart of step S120 in a method for detecting airtightness of protective equipment according to an embodiment of the present application; Figure 5 It is a flowchart of step S140 in a method for detecting airtightness of protective equipment according to an embodiment of the present application; Figure 6 It is a schematic diagram of a process for determining the root cause of a problem in a method for detecting the tightness of protective equipment in an embodiment of the present application; Figure 7 It is a structural schematic diagram of a tightness detection system for protective equipment according to an embodiment of the present application. DETAILED DESCRIPTION

[0023] The terms used in the following embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to be used as limitations to the present application. As used in the specification and appended claims of the present application, the singular expressions "one", "a kind of", "said", "above", "the" and "this" are intended to also include plural expressions, unless there is a clear indication to the contrary in the context. It should also be understood that the term "and / or" used in the present application refers to any or all possible combinations comprising one or more listed items.

[0024] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features, and in the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0025] The embodiments of the present application are further described in detail below in conjunction with the drawings in the specification.

[0026] In the first aspect, the present application provides a method for detecting the tightness of protective equipment, referring to Figure 1 , including the following steps: S110, an ultrasonic transmitting device is set inside the protective device to be detected, and an ultrasonic receiving device is configured outside, so that a pressure difference-free environment is formed inside and outside the protective device.

[0027] In this embodiment, the protective equipment tested is mainly a reinforced concrete sealed door. The arrangement positions of the ultrasonic transmitter and the receiver need to be determined according to the specific structure of the protective equipment to be tested. The key is to be able to cover the tested area and obtain effective signals. Alternatively, the test points can be set in advance, and the staff can move the ultrasonic transmitter and the receiver to measure. In addition, by adjusting the air pressure inside and outside the protective equipment, a pressure-free environment is ensured during the detection process.

[0028] Specifically, the ultrasonic transmitting device can be portable and easy to install and move. It should emit ultrasonic waves of a specific frequency, such as 40kHz, because this frequency can effectively penetrate the materials of most protective equipment and will not be affected by environmental noise. The ultrasonic receiving device should have high sensitivity and be able to capture weak ultrasonic signals. In order to form a pressure-free environment, this can be achieved by using an air pressure regulating device inside the protective equipment, such as using an air pump and a pressure regulating valve to adjust the internal pressure to make it equal to the pressure of the external environment. In actual operation, it is also necessary to ensure that the power supply of the ultrasonic transmitting and receiving devices is stable and reliable to avoid signal interruption.

[0029] S120. Use an ultrasonic transmitting device to transmit ultrasonic waves inside the protective device, and use an ultrasonic receiving device to capture and record ultrasonic signals from air leakage points using ultrasonic imaging technology to determine the number and locations of the leakage points.

[0030] In this embodiment, refer to Figure 2The ultrasonic signal emitted by the ultrasonic transmitter will produce specific acoustic characteristics at the air leak point, which can be captured by the ultrasonic receiver. Ultrasonic imaging technology can convert these signals into images, thereby helping inspectors determine the number and specific locations of leaks. In order to improve detection efficiency, multiple ultrasonic receivers can be used at the same time to capture ultrasonic signals emitted by leaks from different angles.

[0031] Specifically, the ultrasonic transmitter should be set to continuously transmit ultrasonic waves of a constant frequency to ensure a stable signal source. The ultrasonic receiver is equipped with advanced imaging technology, such as an ultrasonic imager, which can capture and record ultrasonic signals from leaks and convert these signals into easy-to-interpret images through software. By analyzing these images, the number and location of leaks can be quickly determined. To ensure the accuracy of the image, the ultrasonic receivers can be calibrated in advance and ensure that they can capture signals from leaks at different distances. In addition, the synchronization between the ultrasonic transmitter and receiver should be ensured to reduce signal interference.

[0032] S130 . For each detected point-shaped leakage point, estimate the leakage aperture size by using a first formula according to the sound pressure level of the ultrasonic signal and the distance between the imaging device and the leakage point.

[0033] In this embodiment, for each detected point-shaped leakage point, it is necessary to estimate the size of the leakage aperture according to the sound pressure level of the ultrasonic signal and the distance between the imaging device and the leakage point.

[0034] Specifically, by measuring the sound pressure level of the ultrasonic signal and determining the distance between the ultrasonic receiving device and the leakage point, the first formula can be used to estimate the size of the leakage aperture. The formula is based on the attenuation characteristics of ultrasonic waves, and the first formula is: Where D is the size of the leakage aperture, P is the measured value of the sound pressure level, P0 is the reference value of the sound pressure level, which is the measured value of the sound pressure level at a distance of 1m from a reference hole with an aperture of 1mm, and R represents the distance between the imaging device and the leakage point.

[0035] S140. According to the estimated leakage aperture size, the leakage volume under the corresponding test pressure of the flow method is calculated by the second formula, and compared with the preset qualified index to determine whether it meets the requirements.

[0036] In this embodiment, based on the leakage aperture size estimated in the previous step, the leakage volume under a specific test pressure can be calculated by the second formula. Then, by comparing the leakage volume with the preset qualified index, it can be determined whether the sealing performance of the protective equipment meets the standard.

[0037] Specifically, the second formula is a preset mathematical expression that can be linked to the leakage aperture size, test pressure and other relevant parameters to estimate the leakage volume under given pressure conditions.

[0038] In one embodiment, referring to Figure 3 , step S130, after estimating the leakage aperture size by the first formula, the method further comprises the following steps: S310: Determine an obvious leakage point based on the estimated leakage aperture size and the shape of the leakage point.

[0039] In this embodiment, after the estimation of the leakage aperture size is completed, it is necessary to further analyze the shape and size of the leakage point to determine which leakage points are obvious leakage points.

[0040] Specifically, by analyzing the leak point image captured by ultrasonic imaging technology, the shape of the leak point can be observed. For example, if the leak point is in the form of a point and its estimated aperture size exceeds a certain threshold (such as 1mm), it is considered to be an obvious leak point. On the other hand, if the leak point is in the form of a line, even if its aperture size is not large, it may be regarded as an obvious leak point because there may be multiple continuous leak points. In the process of determining the obvious leak point, the location of the leak point also needs to be considered. For example, if the leak point is located in a critical position (such as a door gap or a locking shaft hole), special attention needs to be paid even if the aperture is not large. In addition, historical data can be referred to to understand the common leak point locations of the same type of protective equipment, so as to locate the obvious leak point more efficiently.

[0041] S320, temporarily plugging the detected obvious leakage point, and performing ultrasonic testing again until there is no obvious leakage point.

[0042] In this embodiment, once an obvious leak point is determined, the next step is to temporarily block it, and then perform ultrasonic testing again to verify the effect of the blocking. This process may need to be repeated multiple times until no obvious leak point is detected.

[0043] Specifically, use temporary plugging materials (such as sealing tape or other types of sealing materials) to plug obvious leaks. After plugging, start the ultrasonic test again to see if there are any leaks detected. If there are still obvious leaks, it is necessary to continue the cycle of plugging and testing until all obvious leaks are properly handled and the ultrasonic test no longer shows obvious leaks. When plugging, it is also necessary to pay attention to the selection of materials to ensure that the plugging materials used will not cause damage to the protective equipment and can be cured in a short time to reduce downtime.

[0044] In one embodiment, referring to Figure 4In step S120, an ultrasonic wave is emitted inside the protective device using an ultrasonic wave transmitting device, and an ultrasonic wave receiving device is used to capture and record ultrasonic signals from air leakage points through ultrasonic imaging technology to determine the number and location of leakage points, which specifically includes the following steps: S121. Use an ultrasonic transmitting device to transmit ultrasonic waves inside the protective equipment, use an ultrasonic receiving device to capture and record ultrasonic signals from the air leakage point through ultrasonic imaging technology, and generate a sound level spectrum based on the ultrasonic signals.

[0045] In this embodiment, an ultrasonic transmitter is used to transmit ultrasonic waves in all directions inside the sealed protective device. These ultrasonic waves will propagate in the space inside the protective device, and if they encounter an air leak, they will generate specific ultrasonic signals. After the ultrasonic receiving device captures these signals, it will generate a sound level spectrum through ultrasonic imaging technology. This spectrum reflects the intensity distribution of ultrasonic signals of different frequencies.

[0046] Specifically, for example, an ultrasonic imager equipped with a high-sensitivity microphone array, such as the Fluke ii910 acoustic imager, can be used, which can capture ultrasonic signals of different frequencies and generate a sound level spectrum based on these signals. When the ultrasonic wave encounters a leak, the flow of gas will produce an eddy effect, thereby exciting the ultrasonic wave, which will be captured by the ultrasonic receiving device. By analyzing these signals, it can be determined whether there is a leak and the approximate location of the leak. In practical applications, it is also necessary to ensure the synchronization and stability of the transmitting and receiving devices to improve the detection accuracy.

[0047] S122. Calculate a sound distribution image based on the sound level spectrum and superimpose the sound distribution image on the actual scene image to obtain a superimposed image.

[0048] In this embodiment, the sound distribution images generated based on the sound level spectrum are combined with the images of the actual scene through algorithm calculation to form a superimposed image, so that it is possible to intuitively see where the leakage points exist.

[0049] Specifically, for example, using the Fluke ii910 acoustic imager, it can automatically superimpose the sound distribution image with the actual scene image captured by the camera to form an overlay image. In this image, hot spots of different colors will be displayed around the leak point. The brighter the color of these hot spots, the stronger the ultrasonic signal at that location, and the more obvious the leak point. This method enables technicians to quickly locate the specific location of the leak point, which is convenient for subsequent processing. In order to improve image quality, it is also necessary to calibrate the ultrasonic imager regularly to ensure its stable performance.

[0050] S123, identifying the positions of the leakage points from the superimposed image, and recording the number and position coordinates of the leakage points.

[0051] In this embodiment, the location of the leakage point can be clearly identified by analyzing the superimposed image, marking the location of the leakage point in the image, and recording the number of the leakage points and their coordinate positions in the protective device.

[0052] Specifically, for example, in the overlay image, leaks are usually shown as brightly colored hot spots. Technicians can manually mark the locations of these hot spots or use software to automatically identify the locations and record their coordinate information. These coordinate information are crucial for subsequent repair work because they can help workers quickly find leaks to seal or replace seals. In addition, it is also necessary to record the number of leaks, which helps to evaluate the overall sealing performance of the protective equipment and determine whether further inspection or repair measures are needed.

[0053] In one embodiment, referring to Figure 5 In step S140, according to the estimated leakage aperture size, the leakage volume under the corresponding test pressure of the flow method is calculated by the second formula, and compared with the preset qualified index to determine whether it meets the requirements, which specifically includes the following steps: S141. Calculate the leakage volume under the corresponding test pressure of the flow method by using the second formula according to the estimated leakage aperture size of each point leakage aperture.

[0054] In this embodiment, after a point leakage point is detected, the corresponding leakage amount is calculated using the second formula according to the aperture size of each leakage point, and the accurate leakage amount is estimated by comprehensively considering factors such as the leakage aperture, test pressure and air density.

[0055] Specifically, the second formula is: Among them, q is the leakage, Δp is the preset static pressure difference, ρ is the air density under standard conditions, and π is the pi.

[0056] S142. Obtain an estimated value of the cumulative leakage of all point leakage apertures according to the leakage of each point leakage aperture.

[0057] In this embodiment, the air leakage corresponding to all point-shaped leakage apertures is accumulated to obtain an estimated value of the cumulative air leakage of the entire protective device, thereby being able to comprehensively evaluate the overall airtightness performance of the protective device.

[0058] Specifically, for example, if three point leak apertures are found during the test, their leakage volumes are 0.05m 3 / h, 0.07m 3 / h and 0.03m3 / h, then the estimated cumulative leakage of these three leakage points is 0.05+0.07+0.03=0.15m 3 / h. This estimated cumulative leakage value will be used for comparison with qualified indicators in the next step.

[0059] S143. Compare the estimated value of the cumulative leakage with the preset qualified index under the corresponding test pressure of the flow method to determine whether it meets the requirements.

[0060] In this embodiment, the estimated value of the cumulative leakage obtained in the previous step is compared with a pre-set qualified index to determine whether the sealing performance of the protective equipment has reached the qualified standard.

[0061] Specifically, for example, if the qualified indicator stipulates that under the test pressure of 50Pa, the maximum allowable leakage of the protective equipment is 0.2m 3 / h, and the estimated cumulative leakage we calculated is 0.15m 3 / h, it can be considered that the airtightness of the protective equipment meets the requirements. On the contrary, if the estimated value of the cumulative leakage exceeds the maximum allowable value specified by the qualified index, it means that there is a problem with the airtightness of the protective equipment.

[0062] S144. If the qualified indicators are not met, the flow method is used for further verification and judgment.

[0063] In this embodiment, if the estimated value of the accumulated leakage volume fails to meet the requirements of the qualified index, it is necessary to use the traditional flow method for further verification and confirmation.

[0064] Specifically, for example, if the estimated cumulative leakage is 0.25m 3 / h, exceeding the qualified index of 0.2m 3 / h, the actual measurement needs to be done using the flow method. This means that a closed space needs to be set up on the protective equipment, pressurized in the space, and then the amount of air leakage through the leak point within a certain period of time needs to be measured. If the actual measurement result of the flow method is still higher than the qualified index, the protective equipment needs to be repaired or the seals need to be replaced to improve its sealing performance.

[0065] In one embodiment, referring to Figure 6 , step S140, after determining whether the requirements are met, the method further includes: S610. If the requirements are not met, a troubleshooting operation is performed, which includes checking the installation status of the protective equipment and performing a quality status inspection on the seals of the protective equipment.

[0066] In this embodiment, when it is detected that the sealing performance of the protective device does not meet the requirements, a series of troubleshooting operations are required to determine the problem. These troubleshooting operations mainly include checking the installation status of the protective device and performing quality status inspection on the sealing parts of the protective device.

[0067] Specifically, for example, the installation status inspection of protective equipment can include checking whether the connection between the door frame and the wall is firm, whether the door leaf and the door frame fit tightly, and whether the door lock and other components are intact. In addition, it is also necessary to check whether the seal is installed correctly and whether there is wear or damage. For the quality status inspection of the seal, visual inspection, touch inspection, etc. can be used to preliminarily judge the status of the seal, and further use professional testing tools for more detailed inspection.

[0068] S620. If the problem is still unqualified after elimination, the seal shall be tested for compression reaction force, compression permanent deformation and aging coefficient to determine the root cause of the problem.

[0069] In this embodiment, if the problem is still not solved after the initial investigation, more detailed tests need to be performed on the seal to determine the root cause of the problem. These tests include compression reaction force, compression permanent deformation and aging coefficient tests.

[0070] Specifically, for example, for compression reaction force testing, a special test device such as a universal testing machine can be used to fix the seal specimen between the upper and lower test fixtures, and apply the load at a certain speed, and record the instantaneous compression force under different compression amounts. This helps to evaluate the performance of the seal when under pressure. For compression permanent deformation testing, the seal can be compressed under conditions that simulate the actual use environment and maintained for a period of time, and then the pressure is released to measure its recovery. This can evaluate whether the performance of the seal will be affected by deformation after long-term use. As for the aging coefficient test, the seal is subjected to accelerated aging treatment under simulated high temperature conditions, and then the changes in its physical properties are tested to evaluate the performance stability of the seal after long-term use. When conducting these tests, it is also necessary to ensure the consistency and repeatability of the test conditions to improve the credibility of the test results.

[0071] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0072] In the second aspect, the present application provides a tightness detection system for protective equipment. The tightness detection system for protective equipment of the present application is described below in combination with the above-mentioned tightness detection method for protective equipment.

[0073] Reference Figure 7, a sealing detection system for protective equipment, comprising: An ultrasonic emitting device, used for emitting ultrasonic waves inside the protective equipment to be detected; An ultrasonic receiving device, including an ultrasonic imager, for capturing and recording ultrasonic signals from an air leakage point; A control system for controlling ultrasonic emission and reception; The data analysis unit is used to perform the following steps: According to the ultrasonic signal, determine the number and location of the leakage points; For each detected point-shaped leak, the leak aperture size is estimated by the first formula according to the sound pressure level of the ultrasonic signal and the distance between the imaging device and the leak; According to the estimated leakage aperture size, the leakage volume under the corresponding test pressure of the flow method is calculated by the second formula, and compared with the preset qualified indicators to determine whether it meets the requirements.

[0074] Furthermore, it also includes: User interface device, used for operators to set test parameters and view results.

[0075] Furthermore, it also includes: The communication module is used to realize wireless or wired communication between the components of the detection system, supporting multiple communication protocols such as Wi-Fi, Bluetooth, Ethernet, etc., and ensuring the security and stability of data transmission.

[0076] The air pressure regulating device is used to adjust the air pressure inside the protective equipment to ensure a pressure-free environment during the detection process. It includes an air pump and a pressure regulating valve, which can adjust the internal pressure to be equal to the external environmental pressure as needed.

[0077] The mobile platform is used to assist the movement of the ultrasonic transmitting and receiving devices. It can be designed as a manual or automatic mobile platform as needed to facilitate the flexible movement of the transmitting and receiving devices within larger protective equipment.

[0078] The power management unit is used to power the entire detection system. It supports battery power and AC power supply to ensure the portability and long-term operation capability of the detection system.

[0079] The alarm system is used to trigger an alarm when a leak is detected. It can remind operators of leaks through sound, light, etc. It supports threshold setting and automatically triggers an alarm when the detected leakage exceeds the preset threshold.

[0080] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for detecting the tightness of protective equipment, characterized in that: The steps include: An ultrasonic transmitting device is arranged inside the protective equipment to be tested, and an ultrasonic receiving device is arranged outside, so that a pressure difference-free environment is formed inside and outside the protective equipment; Use an ultrasonic transmitter to transmit ultrasonic waves inside the protective equipment, and use an ultrasonic receiver to capture and record ultrasonic signals from air leakage points through ultrasonic imaging technology to determine the number and location of leakage points; For each detected point-shaped leak, the leak aperture size is estimated by the first formula according to the sound pressure level of the ultrasonic signal and the distance between the imaging device and the leak; According to the estimated leakage aperture size, the leakage volume under the corresponding test pressure of the flow method is calculated by the second formula, and compared with the preset qualified indicators to determine whether it meets the requirements.

2. The method for detecting the tightness of protective equipment according to claim 1, characterized in that: After estimating the leakage aperture size by the first formula, the method further comprises the following steps: Determine the obvious leakage point based on the estimated leakage aperture size and the shape of the leakage point; Any obvious leakage points detected are temporarily blocked and ultrasonic testing is performed again until there are no obvious leakage points.

3. The method for detecting the tightness of protective equipment according to claim 1, characterized in that: Use an ultrasonic transmitter to transmit ultrasonic waves inside the protective equipment, and use an ultrasonic receiver to capture and record ultrasonic signals from air leakage points through ultrasonic imaging technology to determine the number and location of leakage points, specifically including the following steps: An ultrasonic transmitter is used to transmit ultrasonic waves inside the protective equipment, and an ultrasonic receiver is used to capture and record ultrasonic signals from air leakage points through ultrasonic imaging technology, and a sound level spectrum is generated based on the ultrasonic signals; Based on the sound level spectrum, a sound distribution image is calculated and the sound distribution image is superimposed on the actual scene image to obtain a superimposed image; Identify the locations of the leak points from the overlay image and record the number and location coordinates of the leak points.

4. The method for detecting the tightness of protective equipment according to claim 1, characterized in that: According to the estimated leakage aperture size, the leakage volume under the corresponding test pressure of the flow method is calculated by the second formula, and compared with the preset qualified index to determine whether it meets the requirements, which specifically includes the following steps: According to the estimated leakage aperture size of each point leakage aperture, the leakage volume under the corresponding test pressure of the flow method is calculated by the second formula; According to the leakage volume of each point leakage aperture, the estimated value of the cumulative leakage volume of all point leakage apertures is obtained; Compare the estimated value of the accumulated air leakage with the preset qualified index under the corresponding test pressure of the flow method to determine whether it meets the requirements; If the qualified indicators are not met, the flow method is used for further verification and judgment.

5. The method for detecting tightness of protective equipment according to claim 1, characterized in that: The first formula is: Where D is the size of the leakage aperture, P is the measured value of the sound pressure level, P0 is the reference value of the sound pressure level, which is the measured value of the sound pressure level at a distance of 1m from a reference hole with an aperture of 1mm, and R represents the distance between the imaging device and the leakage point.

6. The method for detecting the tightness of protective equipment according to claim 5, characterized in that: The second formula is: Among them, q is the leakage, Δp is the preset static pressure difference, ρ is the air density under standard conditions, and π is the pi.

7. The method for detecting the tightness of protective equipment according to claim 4, characterized in that: After determining whether the requirements are met, the method further includes: If it does not meet the requirements, a troubleshooting operation is performed, which includes checking the installation status of the protective equipment and performing a quality status inspection on the seals of the protective equipment; If it is still unqualified after elimination, the seal will be tested for compression reaction force, compression permanent deformation and aging coefficient to determine the root cause of the problem.

8. A sealing detection system for protective equipment, characterized in that: include: An ultrasonic emitting device, used for emitting ultrasonic waves inside the protective equipment to be detected; An ultrasonic receiving device, including an ultrasonic imager, for capturing and recording ultrasonic signals from an air leakage point; A control system for controlling ultrasonic emission and reception; The data analysis unit is used to perform the following steps: According to the ultrasonic signal, determine the number and location of the leakage points; For each detected point-shaped leak, the leak aperture size is estimated by the first formula according to the sound pressure level of the ultrasonic signal and the distance between the imaging device and the leak; According to the estimated leakage aperture size, the leakage volume under the corresponding test pressure of the flow method is calculated by the second formula, and compared with the preset qualified indicators to determine whether it meets the requirements.

9. The airtightness detection system for protective equipment according to claim 8, characterized in that: Also includes: User interface device, used for operators to set test parameters and view results.

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