A method, device, equipment and medium for detecting sealing leakage rate of a connection structure

Abstract

The present application discloses a method, device, equipment and medium for detecting the sealing leakage rate of a connection structure, and relates to the technical field of the sealing performance of connection structures. The method includes obtaining a first leakage rate at a sealing ring connection in a target connection structure; obtaining a second leakage rate at a plurality of connection parts in the target connection structure based on the first leakage rate at the sealing ring connection in the target connection structure; obtaining weight values of the second leakage rates at the plurality of connection parts; wherein the weight values are used to characterize the degree of influence of residual helium on the second leakage rates at the plurality of connection parts; and obtaining the leakage rate of the target connection structure based on the second leakage rates at the plurality of connection parts and the weight values of the second leakage rates at the plurality of connection parts. The above technical solution can more accurately obtain the leakage rate of the target connection structure, thereby more accurately detecting the sealing performance of the wing tank connection structure.

Description

Technical Field

[0001] The present application relates to the technical field of sealing of connection structures, and in particular to a method, device, equipment and medium for detecting the sealing leakage rate of a connection structure. Background Art

[0002] As new-generation aircraft demand ever-increasing structural functionality and performance, hybrid rubber-screw joints, which meet both strength and sealing requirements, are becoming increasingly popular in wing fuel tank structures. However, the widespread use of these hybrid joints inevitably leads to fuel tank leakage. Therefore, studying the leakage mechanisms of rubber-screw joints in fuel tanks is crucial for aircraft structural design, and measuring the leakage rate of structural seals is fundamental to understanding these leaks.

[0003] However, in the prior art, the readings from a helium mass spectrometer are directly used as the characterization results of the sealing performance of the wing tank connection structure. This cannot accurately detect the sealing performance of the wing tank connection structure, thereby affecting the design of the aircraft structure. Summary of the Invention

[0004] The main purpose of this application is to provide a method, device, equipment and medium for detecting the sealing leakage rate of the connection structure, aiming to solve the technical problem in the existing technology that the sealing of the wing tank connection structure cannot be accurately detected, thereby affecting the aircraft structure design.

[0005] To achieve the above objectives, the present application provides, in a first aspect, a method for detecting a sealing leakage rate of a connection structure, the method comprising:

[0006] Obtaining a first leakage rate at a sealing ring connection in a target connection structure; wherein the first leakage rate is a leakage rate caused by leakage caused by the sealing ring;

[0007] Based on the first leakage rate at the sealing ring connection in the target connection structure, obtaining the second leakage rate at the connection of multiple connectors in the target connection structure; wherein the second leakage rate is the leakage rate caused by the leakage of the connector;

[0008] Obtaining weighted values of the second leakage rates at the connection points of the plurality of connectors; wherein the weighted values are used to characterize the degree of influence of the residual helium on the second leakage rates at the plurality of connectors;

[0009] The leakage rate of the target connection structure is obtained based on the second leakage rates of the plurality of connection points of the connection pieces and the weight values of the second leakage rates of the plurality of connection points of the connection pieces.

[0010] Optionally, obtaining weighted values of the second leakage rates at the connection points of the plurality of connectors includes:

[0011] Obtaining the uncertainties at the plurality of connecting pieces respectively; wherein the uncertainties include the retention ratios of helium at the plurality of connecting pieces;

[0012] Based on the uncertainty, weighted values of second leakage rates at the connection points of the connectors are obtained.

[0013] Optionally, obtaining weighted values of the second leakage rates at the connection points of the connectors based on the uncertainty includes:

[0014] The weighted values of the second leakage rates at the connection points of the plurality of connectors are obtained by the following relationship:

[0015]

[0016] Among them, ω i represents the weight parameter of the second leakage rate at the i-th connection, α represents the proportion of remaining helium in the air after the first connection is measured, and α i It represents the proportion of helium remaining in the air after the measurement of the i-th connector, and n represents the number of connectors.

[0017] Optionally, obtaining the leakage rate of the target connection structure based on the second leakage rates of the plurality of connection points of the connectors and weight values of the second leakage rates of the plurality of connection points of the connectors includes:

[0018] Obtaining an error factor based on an error in a detection process of the target connection structure;

[0019] The leakage rate of the target connection structure is obtained based on the error factor, the second leakage rates of the plurality of connection points of the connection elements, and weight values of the second leakage rates of the plurality of connection points of the connection elements.

[0020] Optionally, obtaining the leakage rate of the target connection structure based on the error factor, the second leakage rates of the plurality of connection points of the connection members, and weight values of the second leakage rates of the plurality of connection points of the connection members includes:

[0021] The leakage rate of the target connection structure is obtained by the following relationship:

[0022]

[0023] Among them, q mean Indicates the leakage rate of the target connection structure in mbar·L / s; Q i represents the leakage rate at the i-th connection, in mbar·L / s; α represents the remaining helium ratio in the air after the first connection is measured, α irepresents the proportion of helium remaining in the air after the i-th connector is measured, n represents the number of connectors, and β represents the error factor.

[0024] Optionally, the device is applied to a detection device, wherein the detection device includes a support base and a sealing connection mechanism;

[0025] The support base includes a support plate, side baffles are provided on both sides of the support plate, and a positioning protrusion, a plurality of support columns and a plurality of detection grooves are provided on the support plate between the two side baffles, the positioning protrusion is used to position the test piece or the target connection structure, and the test piece is used to obtain a first leakage rate at the sealing ring connection in the target connection structure;

[0026] The sealing connection mechanism includes a mounting plate, a vacuum column is mounted on the mounting plate, a vacuum cavity is opened in the vacuum column, one end of the vacuum column is connected to the helium mass spectrometer, and the other end is opened with a mounting groove, the mounting groove is used to install the sealing ring;

[0027] A fastener is connected between the support base and the sealing connection mechanism, and the fastener is used to fasten the support base and the sealing connection mechanism.

[0028] Optionally, a plurality of first fastening holes are opened on the side baffle, a plurality of second fastening holes are opened on the mounting plate, the fastener includes a plurality of fastening bolts, the plurality of fastening bolts correspond one-to-one to the plurality of first fastening holes, and the fastening bolts pass through the first fastening holes and the second fastening holes to fasten the side baffle and the mounting plate.

[0029] In a second aspect, the present application provides a sealing leakage rate detection device for a connection structure, the device comprising:

[0030] an acquisition module, configured to acquire a first leakage rate at a sealing ring connection in a target connection structure; wherein the first leakage rate is a leakage rate caused by the sealing ring when the target connection structure is detecting the leakage rate;

[0031] a first obtaining module, configured to obtain, based on a first leakage rate at a sealing ring connection in the target connection structure, a second leakage rate at a plurality of connection pieces in the target connection structure; wherein the second leakage rate is a leakage rate caused by the connection piece when the leakage rate of the target connection structure is detected;

[0032] A second obtaining module is configured to obtain weight values of second leakage rates at the connection points of the plurality of connectors; wherein the weight values are used to characterize the degree of influence of residual helium on the second leakage rates at the plurality of connectors;

[0033] The third obtaining module is configured to obtain the leakage rate of the target connection structure based on the second leakage rates of the connection points of the plurality of connectors and weight values of the second leakage rates of the connection points of the plurality of connectors.

[0034] In a third aspect, the present application provides a computer device, which includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the method described in the embodiment.

[0035] In a fourth aspect, the present application provides a computer-readable storage medium, on which a computer program is stored, and a processor executes the computer program to implement the method described in the embodiment.

[0036] Through the above technical solution, this application has at least the following beneficial effects:

[0037] The embodiments of the present application propose a sealing leakage rate detection method, device, equipment and medium for a connection structure. The method first obtains a first leakage rate at a sealing ring connection in a target connection structure; wherein the first leakage rate is the leakage rate caused by the sealing ring; then, based on the first leakage rate at the sealing ring connection in the target connection structure, obtains a second leakage rate at a plurality of connection parts in the target connection structure; wherein the second leakage rate is the leakage rate caused by the connection parts; then obtains weighted values of the second leakage rates at the connections of the plurality of connection parts; wherein the weighted values are used to characterize the degree of influence of residual helium on the second leakage rates at the plurality of connection parts; then obtains weighted values of the second leakage rates at the connections of the plurality of connection parts; wherein the weighted values are used to characterize the degree of influence of residual helium on the second leakage rates at the plurality of connection parts; finally, based on the second leakage rates at the connections of the plurality of connection parts and the weighted values of the second leakage rates at the connections of the plurality of connection parts, obtains the leakage rate of the target connection structure. That is, when it is necessary to test the sealing leakage rate of the target connection structure, the first leakage rate of the sealing ring in contact with the target connection structure during the test is first detected, and then the second leakage rates of several connecting parts in the target connection structure are obtained. Then, based on the retention amount of helium in the air, corresponding weight values are assigned to the second leakage rates of the several connecting parts. Finally, the final leakage rate of the target connection structure is obtained based on the second leakage rates of the several connections and the corresponding weight values. That is, when the present application tests the leakage rate of the target connection part, since the first leakage rate at the sealing ring connection is tested, the influence of the sealing ring leakage on the target connection structure is taken into account when testing the leakage rate. The second leakage rate of the target connection structure obtained in this way eliminates the first leakage rate, that is, when testing the leakage rate of the target connection structure, the leakage error of the sealing ring is eliminated. At the same time, due to the different amounts of helium atoms remaining in the air after multiple helium sprayings, the second leakage rate at each connector is affected. The present application assigns corresponding weight values to the second leakage rate of each connector based on the amount of helium remaining in the air at each connector. In this way, when detecting the leakage rate of the target connection structure, the influencing factor of the helium remaining in the air is taken into account. In summary, when detecting the leakage rate of the target connection structure, two factors that are easy to overlook but very important are taken into account, namely the leakage influencing factor of the sealing ring connection and the influencing factor of the amount of helium remaining in the air. Therefore, this method can more accurately detect the leakage rate of the wing fuel tank connection structure, that is, the sealing performance of the wing fuel tank connection structure. Since the sealing performance of the wing fuel tank connection structure can be more accurately detected, the fuel tank of the aircraft wing can be better designed. Since the fuel tank of the aircraft wing can be better designed, the aircraft with better performance can be designed. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1A schematic diagram of the computer device structure of the hardware operating environment involved in the embodiments of the present application;

[0039] Figure 2 This is a flow chart of a method for detecting a sealing leakage rate of a connection structure according to an embodiment of the present application;

[0040] Figure 3 A schematic diagram of the three-dimensional structure of the detection device provided in an embodiment of the present application;

[0041] Figure 4 A schematic diagram of the three-dimensional structure of the support base provided in an embodiment of the present application;

[0042] Figure 5 A schematic diagram of the three-dimensional structure of the sealing connection mechanism provided in an embodiment of the present application;

[0043] Figure 6 Schematic diagram of a sealing leakage rate detection device for a connection structure according to an embodiment of the present application.

[0044] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings.

[0045] Figure numerals: 1. Sealing connection mechanism; 11. Mounting plate; 12. Second fastening hole; 13. Mounting groove; 14. Vacuum column; 15. Flange joint; 2. Support base; 21. Support plate; 22. Side baffle; 23. First fastening hole; 24. Positioning protrusion; 25. Support column; 26. Detection groove. DETAILED DESCRIPTION

[0046] It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0047] With the increasing demands for structural functionality and performance in new-generation aircraft, hybrid rubber-bolt joints, which meet both strength and sealing requirements, are becoming increasingly popular in wing fuel tank structures. However, the widespread use of hybrid rubber-bolt joints inevitably leads to fuel tank leakage. "Hybrid rubber-bolt joints" refer to structures where both rubber and bolts are used in connection. Therefore, studying the leakage mechanisms of rubber-bolt joints in fuel tanks is of great significance to aircraft structural design, and measuring the leakage rate of structural seals is fundamental to understanding their leakage behavior. Currently, the main methods for structural seal testing include bubble testing, negative pressure testing, positive pressure testing, and helium mass spectrometry. These methods require the structure to have a closed cavity to facilitate the flow of gas or liquid into or out of the cavity, thereby creating positive or negative pressure. During laboratory research, extensive experimental verification is required to fully analyze the impact of structural fabrication parameters on sealing performance. However, fabricating each test piece in the shape of a small wing box not only increases testing complexity and prolongs testing cycles, but also leads to high manufacturing costs and material waste, making the results unprofitable. Therefore, the need for a seal testing method suitable for connecting coupon-level test pieces is urgent. For the helium mass spectrometer sealing detection method, the reading results are generally used directly as the characterization results of the sealing performance, ignoring the influence of residual helium atoms in the air after multiple spraying of helium. For test pieces with a large sealing leakage rate, these errors can be ignored, but when the leakage rate of the tested test piece is small, this error will affect the measurement results. At the same time, there is also a certain amount of leakage at the bonding point of the sealing ring, and this part of the error also needs to be eliminated in the process of evaluating the sealing performance of the structure. Therefore, it is necessary to calibrate the errors generated in the measurement process, and when calculating the final sealing leakage rate, consider the residual helium atoms absorbed by the helium mass spectrometer and the leakage at the sealing ring to compensate for the measurement results. In summary, the reading results of the helium mass spectrometer are currently used directly as the characterization results of the sealing performance of the wing tank connection structure. In this way, the sealing performance of the wing tank connection structure cannot be accurately detected, which affects the design of the aircraft structure.

[0048] In order to solve the above technical problems, the present application provides a sealing leakage rate detection method, device, equipment and medium for a connection structure. Before introducing the specific technical solution of the present application, the hardware operating environment involved in the embodiment of the present application is first introduced.

[0049] Reference Figure 1 , Figure 1 This is a schematic diagram of the computer device structure of the hardware operating environment involved in the embodiment of the present application.

[0050] like Figure 1As shown, the computer device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the user interface 1003 may optionally include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a wireless fidelity (WIreless-FIdelity, WI-FI) interface). The memory 1005 may be a high-speed random access memory (Random Access Memory, RAM) memory, or a stable non-volatile memory (Non-Volatile Memory, NVM), such as a disk memory. The memory 1005 may optionally be a storage device independent of the aforementioned processor 1001.

[0051] Those skilled in the art will understand that Figure 1 The structure shown in the figure does not constitute a limitation on the computer device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0052] like Figure 1 As shown, the memory 1005 as a storage medium may include an operating system, a data storage module, a network communication module, a user interface module and an electronic program.

[0053] exist Figure 1 In the computer device shown, the network interface 1004 is mainly used for data communication with the network server; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the computer device of the present invention can be set in the computer device, and the computer device calls the sealing leakage rate detection device of the connection structure stored in the memory 1005 through the processor 1001, and executes the sealing leakage rate detection method of the connection structure provided in the embodiment of the present application.

[0054] Reference Figure 2 Based on the hardware environment of the aforementioned embodiment, an embodiment of the present application provides a method for detecting the sealing leakage rate of a connection structure, the method comprising:

[0055] S10: Obtain a first leakage rate at a sealing ring connection in a target connection structure; wherein the first leakage rate is a leakage rate caused by leakage caused by the sealing ring.

[0056] In specific implementations, the target connection structure refers to the structure used to connect an aircraft's fuel tank. Of course, this target connection structure can also be used in other aircraft locations, or even for products other than aircraft. Because the interface between the sealing ring, the target connection structure, and the fixed plate cannot be guaranteed to be leak-free when testing the target connection structure's leakage rate, introducing errors into the test process, it is necessary to pre-test and calibrate the connection's leakage rate to eliminate the influence of the sealing ring connection on the target connection structure's sealing performance test results. Therefore, the first leakage rate of the target connection structure caused by the sealing ring connection is first tested.

[0057] S11: Based on the first leakage rate of the sealing ring connection in the target connection structure, obtain the second leakage rate of the connection between the plurality of connectors in the target connection structure; wherein the second leakage rate is the leakage rate caused by the leakage of the connector.

[0058] During implementation, the leakage rate of the target connection structure is primarily caused by its connectors. Therefore, testing the target connection structure's leakage rate primarily involves testing the leakage rate at its connectors, where connectors refer to bolts, screws, and the like. Specifically, after determining the leakage rate at the sealing ring connection, the leakage rate at the connectors is measured, sequentially obtaining the leakage rates at several connectors. Since the first leakage rate detected in step S10 is the leakage rate caused by the sealing ring leaking when the target connection structure is tested by the testing device, and the sealing ring is only provided for connection to the testing device, the target connection structure itself does not have a sealing ring, the actual leakage rate of the target connection structure must exclude the first leakage rate. Therefore, the leakage rates at these connectors are the leakage rates after excluding the error in the sealing ring connection leakage rate. Specifically, excluding the first leakage rate can be achieved by measuring the first and second leakage rates separately and then subtracting the first leakage rate from the second leakage rate; or, alternatively, the value displayed on the testing device is simply the value obtained by subtracting the first leakage rate from the second leakage rate. This method is more efficient for determining the leakage rate of the target connection structure and can be achieved by simply configuring a corresponding program within the testing device through conventional means. In this way, the second leakage rate measured based on the first leakage rate can greatly improve the accuracy of the leakage rate at the connecting piece of the target connection structure.

[0059] S12: Obtaining weight values of the second leakage rates at the connection points of the plurality of connectors; wherein the weight values are used to characterize the degree of influence of residual helium on the second leakage rates at the plurality of connectors.

[0060] In a specific implementation, the number of connectors may be one connector or two or more connectors. When there is only one connector, the second leak rate in step S11 can be used as the leak rate of the connector. When there are multiple connectors, since multiple helium sprays are required to test the leak rates of multiple connectors, the amount of helium remaining in the air varies. This results in the second leak rate test result being the leak rate of the multiple connectors (bolts). The leak rates of multiple connectors may vary significantly and cannot represent the leak rate of the entire multi-bolt connection structure. Therefore, by considering the degree to which the amount of helium remaining in the air affects the leak rate at the connector, the accuracy of the leak rate of the target connection structure can be further improved.

[0061] S13: Obtaining the leakage rate of the target connection structure based on the second leakage rates of the plurality of connection points of the connection pieces and the weight values of the second leakage rates of the plurality of connection points of the connection pieces.

[0062] During the specific implementation process, the second leakage rate is obtained based on the first leakage rate taking into account the error caused by the sealing ring, and then the corresponding weight value of the second leakage rate is obtained based on the amount of helium retained in the air. Therefore, after assigning a corresponding weight value to each second leakage rate, the final leakage rate of the target connection structure is obtained, and the leakage rate of the target connection structure obtained in this way will be more accurate.

[0063] In summary, when it is necessary to test the sealing leakage rate of a target connection structure, the first leakage rate of the sealing ring in contact with the target connection structure during the test is first detected, and then the second leakage rates of several connecting parts in the target connection structure are obtained. Then, based on the amount of helium retained in the air, corresponding weight values are assigned to the second leakage rates of the several connecting parts. Finally, the final leakage rate of the target connection structure is obtained based on the second leakage rates of the several connections and the corresponding weight values. That is, when testing the leakage rate of the target connection part, the present application detects the first leakage rate at the sealing ring connection, and therefore takes into account the influence of the sealing ring leakage when testing the leakage rate of the target connection structure. The second leakage rate of the target connection structure obtained in this way eliminates the first leakage rate, that is, when testing the leakage rate of the target connection structure, the leakage error of the sealing ring is eliminated. At the same time, due to the different amounts of helium atoms remaining in the air after multiple helium sprayings, the second leakage rate at each connector is affected. The present application assigns corresponding weight values to the second leakage rate of each connector based on the amount of helium remaining in the air at each connector. In this way, when detecting the leakage rate of the target connection structure, the influencing factor of the helium remaining in the air is taken into account. In summary, when detecting the leakage rate of the target connection structure, two factors that are easy to overlook but very important are taken into account, namely the leakage influencing factor of the sealing ring connection and the influencing factor of the amount of helium remaining in the air. Therefore, this method can more accurately detect the leakage rate of the wing fuel tank connection structure, that is, the sealing performance of the wing fuel tank connection structure. Since the sealing performance of the wing fuel tank connection structure can be more accurately detected, the fuel tank of the aircraft wing can be better designed. Since the fuel tank of the aircraft wing can be better designed, the aircraft with better performance can be designed.

[0064] In order to obtain the weighted value of the second leakage rate, a corresponding preferred method is given in some embodiments, that is, the step of obtaining the weighted values of the second leakage rates at the connections of the several connectors includes: first obtaining the uncertainties at the several connectors respectively; wherein the uncertainties include the retention ratios of helium at the several connectors; and then obtaining the weighted values of the second leakage rates at the connections of the several connectors based on the uncertainties.

[0065] In this embodiment, since the test results of multiple connectors are the leakage rates at the connections of multiple connectors (bolts), the numerical values of the leakage rates may vary greatly and cannot represent the leakage rate of the entire multi-nail connection structure. Therefore, a weighted average data fusion method is proposed to perform uncertainty analysis on the leakage rates at different bolt holes, and based on the uncertainty and as a weight value, the leakage rates at all bolt connections are weightedly fused. The weighted fusion result can be used as the final leakage rate test data fusion result of the multi-nail structure (multiple connectors). The specific method is to assume that the leakage rate parameter of the target connector has n data sources, that is, n bolt holes. Among them, the leakage rate of the i-th bolt hole is Qi, where i = 1, 2, ..., n. Since the quality of the test results at each bolt is different and is interfered by various external factors, Qi has a certain degree of randomness. Among them, the leakage rate of each bolt hole is related to the helium retention ratio α in the closed cavity during calibration, so considering the remaining helium ratio after the first measurement, the optimal weight distribution criterion is established, and the weight ω i The calculation formula is:

[0066]

[0067] Among them, ω i represents the weight parameter of the second leakage rate at the i-th connection, α represents the proportion of remaining helium in the air after the first connection is measured, and α i It represents the proportion of helium remaining in the air after the measurement of the i-th connector, and n represents the number of connectors.

[0068] In order to more accurately obtain the leakage rate of the target connection structure, in some embodiments, a preferred technical solution is given, that is, the step of obtaining the leakage rate of the target connection structure based on the second leakage rates of several connection parts and the weight values of the second leakage rates of several connection parts includes: first, obtaining an error factor based on the error in the detection process of the target connection structure; and then obtaining the leakage rate of the target connection structure based on the error factor, the second leakage rates of several connection parts and the weight values of the second leakage rates of several connection parts.

[0069] In this embodiment, in order to further improve the accuracy of the leakage rate of the target connection structure, it is necessary to consider the error in the measurement process, so it is necessary to determine the error factor β and incorporate the error factor β into obtaining the leakage rate of the target connection structure.

[0070] Specifically, the leakage rate of the target connection structure is obtained through the following relationship:

[0071]

[0072] Among them, q meanIndicates the leakage rate of the target connection structure in mbar·L / s; Q i represents the leakage rate at the i-th connection, in mbar·L / s; α represents the remaining helium ratio in the air after the first connection is measured, α i represents the proportion of helium remaining in the air after the i-th connector is measured, n represents the number of connectors, and β represents the error factor.

[0073] In summary, this application establishes an evaluation criterion for calculating the overall sealing performance from the local sealing leakage rate. By using the weighted average data fusion method of the sealing leakage rates at different positions, and taking into account the helium retention error in the air and the accuracy error of the connecting sealing ring, the average leakage rate at each bolt of the target connection structure is calculated, laying the foundation for evaluating the overall sealing performance of the structure.

[0074] In some embodiments, a detection device that can implement the above method is provided, such as Figure 3-Figure 5 As shown, the detection equipment includes a support base 2 and a sealing connection mechanism 1; the support base 2 includes a support plate 21, and side baffles 22 are provided on both sides of the support plate 21. A positioning protrusion 24, a plurality of support columns 25 and a plurality of detection grooves 26 are provided on the support plate 21 between the two side baffles 22. The positioning protrusion 24 is used to position the test piece or the target connection structure, and the test piece is used to obtain the first leakage rate at the sealing ring connection in the target connection structure; the sealing connection mechanism 1 includes a mounting plate 11, and a vacuum column 14 is installed on the mounting plate 11. A vacuum cavity is opened in the vacuum column 14, one end of the vacuum column 14 is connected to the helium mass spectrometer, and the other end is opened with a mounting groove 13, and the mounting groove 13 is used to install the sealing ring; a fastener is connected between the support base 2 and the sealing connection mechanism 1, and the fastener is used to fasten the support base 2 and the sealing connection mechanism 1. The side guard plate 22 is provided with a plurality of first fastening holes 23, and the mounting plate 11 is provided with a plurality of second fastening holes 12. The fasteners include a plurality of fastening bolts, and the plurality of fastening bolts correspond one-to-one to the plurality of first fastening holes 23. The fastening bolts pass through the first fastening holes 23 and the second fastening holes 12 to fasten the side guard plate 22 and the mounting plate 11.

[0075] In this embodiment, the support base 2 is used to position the target connection structure. The target connection structure can be a single-nail connection or a multi-nail connection (three to nine nails). The fluororubber sealing ring is fixed to the sealing connection mechanism 1 by gluing. The sealing connection mechanism 1 is an integral structure composed of a mounting plate 11, a vacuum chamber and a KF flange joint 15. The fastening bolts are used to fix the connection between the mounting plate 11 and the support base 2. Figure 4As shown, the preferred size of the support base 2 is a concave frame of 196mm×100mm×15mm, and the side baffles 22 on both sides are evenly distributed with first fastening holes 23 for connection with the sealing connection mechanism 1. Around the geometric center of the support plate 21, four support columns 25 with a height of 6mm are preferably distributed to support the target connection structure. Preferably, there is a positioning protrusion at the geometric center of the support plate 21, and a positioning groove is provided on the positioning protrusion, and the positioning groove is used to place the middle bolt of the target connection structure. In addition, eight 20mm×20mm rectangular holes are preferably distributed on the support plate 21 for placing other bolts of the target connection structure. The sealing connection mechanism 1 is as shown Figure 5 As shown, based on the size requirements of the connector, the mounting plate 11 is preferably provided with through-holes with a diameter of 3 mm for connection to the support base 2. A circular groove is located at the geometric center of the front side of the mounting plate 11 for mounting a sealing ring. A through-hole is located at the center of the rear side of the mounting plate 11, forming a vacuum chamber to be sealed. The through-hole of the mounting plate 11 terminates in a KF flange connector 15 for connection to the helium mass spectrometer, thereby connecting the helium mass spectrometer to the vacuum chamber.

[0076] When the leakage rate of the target connection structure is detected by the above-mentioned detection equipment, a calibrated defect-free composite material specimen of the same size as the support plate 21 is prepared, and its thickness is the same as that of the target connection structure, and is placed in the support base 2. The sealing ring is fixed to the protruding groove of the mounting plate 11 and bonded with strong glue to ensure high sealing of the contact surface. The mounting plate 11 is connected to the support base 2 on which the calibrated composite material specimen is placed, and the preload force of the mounting bolts is controlled to ensure that the sealing ring is completely fitted to the surface of the calibrated specimen. The end of the KF flange joint 15 is connected to the helium mass spectrometer, and a vacuum negative pressure sealing detection structure is formed by the specimen surface, the vacuum chamber, the KF flange joint 15 and the helium mass spectrometer. Turn on the helium mass spectrometer, use a spray gun to spray an appropriate amount of helium on the side of the sealing connection mechanism 1, detect and record the sealing leakage rate, and use it as the accuracy threshold of the helium mass spectrometer leakage rate detection of the target connection structure, that is, the actual leakage rate result of the target connection structure must exclude the influence of the accuracy threshold. After determining the leakage rate at the sealed connection, clamp the target connection structure and perform a leakage rate test. The specific method is as follows: for a single-nail structure, fit the single-side surface of the single-nail target connection structure to the support column 25 in the support base 2, and fix its bolt head in the protruding groove in the center of the support base 2. Install the sealing connection mechanism 1 with the calibrated sealing ring on the support base 2 with bolts. By controlling the pre-tightening force of the bolt installation, the degree of fit between the sealing ring and the surface of the target connection structure is consistent with that of the calibration test piece. Turn on the helium mass spectrometer leak detector, and draw air to make the vacuum chamber pressure reach below 0.1 atmospheres, forming a vacuum negative pressure state. During the installation process, the sealing detection device is in an inverted state. Spray an appropriate amount of helium gas on the square groove of the support base 2 near the bolt position, observe the changes in the reading of the helium mass spectrometer, and record the value when the reading suddenly changes. This value is the leakage rate of the structure to be tested considering the leakage accuracy threshold of the sealing ring.

[0077] For the multi-nail structure, fit one side surface of the target connection structure with the support column 25 to ensure that the bolt head in the middle position is fixed in the central protruding groove of the support base 2. The nail spacing of the multi-nail target connection structure is preferably maintained at 20mm-40mm, so as to ensure that the bolts in the remaining positions can contact the air through the square groove of the support base 2. Select a suitable connecting through hole on the sealing connection mechanism 1, and connect the support base 2 to the sealing connection mechanism 1 with a fastening bolt to ensure that the fastening bolt installation pre-tightening force is consistent with the calibration. The test method after turning on the helium mass spectrometer leak detector is consistent with the single-nail structure test method, and the leak rate value obtained is the leak rate of the middle bolt considering the accuracy threshold. Repeat the above operation, measure the leakage rate of the bolt holes in all other positions except the middle bolt position, and record the leakage rate value. After obtaining the above measurement values, the weight value of the multi-nail target connection structure is obtained by the above method, and the final leakage rate of the target connection structure is obtained by the formula in the above method.

[0078] In order to further illustrate the above method, an example is given. The specific example is as follows:

[0079] The testing equipment mainly consists of two parts: a support base 2 and a sealing connection mechanism 1. Taking the nine-nail composite material single lap glue screw connection test piece as an example (the target connection structure has nine connecting parts), the test piece (target connection structure) has a total length of 284mm, a width of 84mm, an overlap area length of 84mm, a total thickness of 4mm, a hole margin of 12mm, a hole spacing of 30mm, a bolt for a high lock bolt, and an XM22 polysulfide sealant. When installing the test piece, first install the middle bolt and nut part in the protruding groove of the support base 2, adjust the position of the test piece so that the other bolts are in the center of the detection rectangular groove, and then cover the sealing connection mechanism 1 on the test piece so that the vacuum chamber is facing the upper left corner bolt. At this time, the fluororubber sealing ring contacts the plane of the test piece, and a passage is formed in the vacuum chamber. Finally, according to the position of the through hole and the bolt hole, the two parts are fastened together using a fastening bolt with a diameter of 3mm. The tightening process of the fastening bolt is manually controlled by a torque wrench to ensure that the preload force of the six bolts is the same. The specific sealing test process is as follows:

[0080] 1) Prepare a composite laminate specimen measuring 184 mm * 184 mm * 4 mm, with a smooth surface and no obvious defects. Place it in a suitable position on the support base 2. Secure the fluororubber sealing ring to the sealing connection mechanism 1 with strong glue. Place the connection mechanism in a suitable position on the composite specimen, with the fluororubber sealing ring firmly against the specimen surface. Tighten the mounting bolts using a torque wrench to a torque of 10 N.

[0081] 2) Connect the sealing connection mechanism 1KF flange connector 15 to the helium mass spectrometer flange connector 15, turn on the device and start vacuuming until the device can no longer pump air, and record the device pressure value P and leakage rate level Q_ini.

[0082] 3) Spray an appropriate amount of helium near the connection part of the fluororubber sealing ring, record the helium value q, wait five minutes and observe the changes in the reading of the helium mass spectrometer leak detector, record the peak reading level Q_0 and observe and record the final reading level Q_fin.

[0083] 4) Remove the composite material test piece and install the nine-bolt composite material rubber-screw connection test piece. Place the middle bolt and nut part in the protruding groove of the support base 2 to position the test piece. Place the sealing connection mechanism 1 on the side of the bolt head of the test piece, with the vacuum chamber facing the bolt head of the test piece numbered one. Tighten the mounting bolts with a torque wrench, and control the torque to 10N.

[0084] 5) Install the test piece and the detection device on the helium mass spectrometer, turn on the detector and evacuate until it can no longer be evacuated. Record the equipment pressure value and leakage rate level. Repeat the measurement 5 times and record the maximum sealing leakage level Q_1 of the screw connection test piece.

[0085] 6) According to the above steps 4) and 5), complete the nine bolt seal leakage level measurements and record them respectively as Q_1...Q_9 (no Q_5) according to the corresponding bolt numbers.

[0086] 7) Substitute the above recorded values into the weighted average leakage rate calculation formula to solve the overall average leakage rate of the connection structure.

[0087] In summary, the present application designs a sealing connection mechanism 1 with a built-in vacuum chamber. By connecting the fluororubber sealing ring and the fastening bolts, the sealing of the vacuum chamber is ensured, the accuracy of the helium mass spectrometer detection is improved, and the function of sealing testing of single-nail or multi-nail specimen-level materials without a vacuum chamber structure is realized, which reduces the difficulty and cost of the composite specimen sealing experiment and provides great convenience for the performance research of laboratory sealed connection structural parts. At the same time, a helium mass spectrometer sealing leakage rate detection method with precision calibration and error compensation is designed. The sealing leakage rate of the fluororubber sealing ring connection part is calibrated by testing the composite laminate specimen, and this is used as the critical value for judging the sealing leakage of the rubber screw connection. By compensating for the error of the residual helium atoms in the air during the helium mass spectrometer test process, the calculation result is made more accurate.

[0088] In another embodiment, Figure 6 As shown, based on the same inventive concept as the above embodiment, the embodiment of the present application further provides a sealing leakage rate detection device for a connection structure, the device comprising:

[0089] an acquisition module, configured to acquire a first leakage rate at a sealing ring connection in a target connection structure; wherein the first leakage rate is a leakage rate caused by the sealing ring when the target connection structure is detecting the leakage rate;

[0090] a first obtaining module, configured to obtain, based on a first leakage rate at a sealing ring connection in the target connection structure, a second leakage rate at a plurality of connection pieces in the target connection structure; wherein the second leakage rate is a leakage rate caused by the connection piece when the leakage rate of the target connection structure is detected;

[0091] A second obtaining module is configured to obtain weight values of second leakage rates at the connection points of the plurality of connectors; wherein the weight values are used to characterize the degree of influence of residual helium on the second leakage rates at the plurality of connectors;

[0092] The third obtaining module is configured to obtain the leakage rate of the target connection structure based on the second leakage rates of the connection points of the plurality of connectors and weight values of the second leakage rates of the connection points of the plurality of connectors.

[0093] It should be noted that each module in the sealing leakage rate detection device of the connecting structure in this embodiment corresponds one-to-one to each step in the sealing leakage rate detection method of the connecting structure in the aforementioned embodiment. Therefore, the specific implementation method and technical effects achieved in this embodiment can refer to the implementation method of the sealing leakage rate detection method of the aforementioned connecting structure, and will not be repeated here.

[0094] In addition, in one embodiment, the present application also provides a computer device, which includes a processor, a memory, and a computer program stored in the memory, and the computer program implements the method in the aforementioned embodiment when executed by the processor.

[0095] In addition, in one embodiment, the present application further provides a computer storage medium, on which a computer program is stored. When the computer program is executed by a processor, the method in the aforementioned embodiment is implemented.

[0096] In some embodiments, the computer-readable storage medium may be a memory device such as FRAM, ROM, PROM, EPROM, EEPROM, flash memory, magnetic surface mount memory, optical disk, or CD-ROM; or various devices including any one or any combination of the above memories. The computer may be various computing devices including smart terminals and servers.

[0097] In some embodiments, executable instructions may be in the form of a program, software, software module, script, or code, written in any form of programming language (including compiled or interpreted languages, or declarative or procedural languages), and may be deployed in any form, including as a stand-alone program or as a module, component, subroutine, or other unit suitable for use in a computing environment.

[0098] As an example, executable instructions may, but need not, correspond to a file in a file system, may be stored as part of a file that stores other programs or data, such as in one or more scripts in a HyperText Markup Language (HTML) document, in a single file dedicated to the program in question, or in multiple coordinating files (e.g., files storing one or more modules, subroutines, or code portions).

[0099] By way of example, executable instructions may be deployed to be executed on one computing device, or on multiple computing devices at one site, or on multiple computing devices distributed across multiple sites and interconnected by a communication network.

[0100] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0101] The serial numbers of the above embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0102] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better embodiment. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as a read-only memory / random access memory, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a multimedia terminal device (which can be a mobile phone, a computer, a television receiver, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0103] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for detecting the sealing leakage rate of a connection structure, characterized in that: The method comprises: Obtaining a first leakage rate at a sealing ring connection in the connection structure; wherein the first leakage rate is a leakage rate caused by leakage of the sealing ring; Based on the first leakage rate of the sealing ring connection in the connection structure, a second leakage rate of the connection points of the plurality of connectors in the connection structure is obtained; wherein the second leakage rate is the leakage rate caused by the leakage at the connection point of the connector; Obtaining weighted values of the second leakage rates at the connection points of the plurality of connectors; wherein the weighted values are used to characterize the degree of influence of residual helium on the second leakage rates at the connection points of the plurality of connectors; The leakage rate of the connection structure is obtained based on the second leakage rates of the connection points of the plurality of connectors and the weight values of the second leakage rates of the connection points of the plurality of connectors.

2. The sealing leakage rate detection method of the connection structure according to claim 1, characterized in that: The obtaining of weighted values of the second leakage rates at the connection points of the plurality of connectors comprises: Obtaining the uncertainties of the connection points of the plurality of connectors respectively; wherein the uncertainties include the remaining proportions of helium at the connection points of the plurality of connectors; Based on the uncertainty, weighted values of second leakage rates at the connection points of the connectors are obtained.

3. The sealing leakage rate detection method of the connection structure according to claim 2, characterized in that: The step of obtaining weighted values of second leakage rates at the connection points of the connectors based on the uncertainty comprises: The weighted values of the second leakage rates at the connection points of the plurality of connectors are obtained by the following relationship: Among them, ω i represents the weight parameter of the second leakage rate at the i-th connection, α represents the proportion of remaining helium in the air after the first connection is measured, and α i It represents the proportion of helium remaining in the air after the measurement of the i-th connector, and n represents the number of connectors.

4. The sealing leakage rate detection method of the connection structure according to claim 1, characterized in that: The obtaining of the leakage rate of the connection structure based on the second leakage rates of the connection points of the plurality of connectors and the weight values of the second leakage rates of the connection points of the plurality of connectors comprises: Obtaining an error factor based on an error in the connection structure detection process; The leakage rate of the connection structure is obtained based on the error factor, the second leakage rates of the plurality of connection points of the connection members, and the weight values of the second leakage rates of the plurality of connection points of the connection members.

5. The method for detecting the sealing leakage rate of a connection structure according to claim 4, wherein: Obtaining the leakage rate of the connection structure based on the error factor, the second leakage rates of the plurality of connection points of the connection members, and weight values of the second leakage rates of the plurality of connection points of the connection members comprises: The leakage rate of the connection structure is obtained by the following relationship: Among them, q mean Indicates the leakage rate of the connection structure, in mbar·L / s; Q i represents the leakage rate at the i-th connection, in mbar·L / s; α represents the proportion of remaining helium in the air after the first connection is measured, α i represents the proportion of helium remaining in the air after the i-th connector is measured, n represents the number of connectors, and β represents the error factor.

6. The method for detecting the sealing leakage rate of a connection structure according to any one of claims 1 to 5, characterized in that: Applicable to a detection device, the detection device comprising a support base (2) and a sealing connection mechanism (1); The support base (2) comprises a support plate (21), side baffles (22) are provided on both sides of the support plate (21), a positioning protrusion (24), a plurality of support columns (25) and a plurality of detection grooves (26) are provided on the support plate (21) between the two side baffles (22), the positioning protrusion (24) is used to position the test piece or the connection structure, and the test piece is used to obtain a first leakage rate at a sealing ring connection in the connection structure; The sealing connection mechanism (1) comprises a mounting plate (11), a vacuum column (14) is mounted on the mounting plate (11), a vacuum cavity is defined in the vacuum column (14), one end of the vacuum column (14) is connected to a helium mass spectrometer, and the other end of the vacuum column (14) is defined with a mounting groove (13), and the mounting groove (13) is used for mounting the sealing ring; A fastener is connected between the support base (2) and the sealing connection mechanism (1), and the fastener is used to fasten the support base (2) and the sealing connection mechanism (1).

7. The method for detecting the sealing leakage rate of a connection structure according to claim 6, wherein: The side baffle (22) is provided with a plurality of first fastening holes (23), and the mounting plate (11) is provided with a plurality of second fastening holes (12). The fasteners include a plurality of fastening bolts, and the plurality of fastening bolts correspond one to one with the plurality of first fastening holes (23). The fastening bolts pass through the first fastening holes (23) and the second fastening holes (12) to fasten the side baffle (22) and the mounting plate (11).

8. A sealing leakage rate detection device for a connection structure, characterized in that: The device comprises: An acquisition module, configured to acquire a first leakage rate at a sealing ring connection in a connection structure; wherein the first leakage rate is a leakage rate caused by the sealing ring when the connection structure is detecting the leakage rate; a first obtaining module, configured to obtain, based on a first leakage rate at a sealing ring connection in the connection structure, a second leakage rate at a plurality of connection points in the connection structure; wherein the second leakage rate is a leakage rate caused by the connection points of the connection points when the leakage rate of the connection structure is detected; A second obtaining module is configured to obtain weight values of the second leakage rates at the connection points of the plurality of connectors; wherein the weight values are used to characterize the degree of influence of the residual helium on the second leakage rates at the connection points of the plurality of connectors; The third obtaining module is configured to obtain the leakage rate of the connection structure based on the second leakage rates of the connection points of the plurality of connectors and weight values of the second leakage rates of the connection points of the plurality of connectors.

9. A computer device, characterized in that: The computer device includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the method according to any one of claims 1 to 5.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and the processor executes the computer program to implement the method according to any one of claims 1 to 5.

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