A test device and method for detecting air tightness of vehicle door

Abstract

The present application relates to the technical field of vehicle door air tightness testing, and more particularly to a testing device and method for testing vehicle door air tightness. The device comprises an airbag, a catheter, a first pressure sensor, and a second pressure sensor. The airbag is placed in the cavity of the door to be tested and generates an air pressure shock by bursting. The catheter provides an air guide channel and is equipped with a detonation mechanism. The first pressure sensor senses pressure changes within the airbag, and the second pressure sensor detects pressure changes within the door cavity. Both are connected to a pressure collector via a wire for data processing. The present application can effectively improve the accuracy and reliability of vehicle door air tightness testing, while simplifying the operating process and improving testing efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle door air tightness detection, and in particular to a testing device and method for detecting vehicle door air tightness. Background Art

[0002] In recent years, the rapid development of the automotive industry and technological progress have led to the gradual popularization of safety configurations, especially the improvement of passive safety systems, which has significantly improved the safety performance of vehicles. Among them, the "side pole impact" test has become an important part of the CNCAP evaluation. In order to meet higher safety standards, major OEMs focus on improving the passive safety of vehicles during the design stage, especially in terms of the rapid response of side airbags and air curtains, and put forward higher requirements for the air tightness of car doors.

[0003] At present, there are two main methods for testing the air tightness of vehicle doors: one is to verify the air tightness and pressure changes of vehicle doors through actual collision tests; the other is to use traditional air pressure testing equipment, such as air pumps, to perform inflation tests on the vehicle door cavity. In actual collision tests, although this method can accurately reflect the air tightness of vehicle doors under real collision conditions, it is not only costly, but also needs to be carried out in the later stages of vehicle development. Once problems are found, there is limited room for adjustment, and traditional air pressure testing equipment is difficult to provide sufficient air pressure to simulate the instantaneous pressure changes during a collision, resulting in inaccurate and unreliable test results.

[0004] However, both methods have obvious shortcomings. First, actual collision tests are extremely expensive and can only be conducted in the later stages of vehicle development, which is not conducive to early detection and resolution of problems. Second, traditional air pressure testing equipment cannot provide sufficient air pressure to simulate real collision scenarios, especially when large pressure changes occur in a short period of time, which makes the test results often inaccurately reflect the actual situation. In addition, the operation of these devices is complicated and requires professional personnel to operate, which increases the difficulty and uncertainty of the test. Therefore, how to achieve accurate testing of vehicle door airtightness at low cost and high efficiency is a technical problem that needs to be solved urgently. Summary of the Invention

[0005] In order to overcome the above-mentioned deficiencies of the prior art, the present application provides a test method and experimental device for detecting the air tightness of vehicle doors, which can achieve accurate testing of the air tightness of vehicle doors at low cost and high efficiency.

[0006] This application is achieved through the following technical solutions:

[0007] A test device for detecting the air tightness of a vehicle door, comprising an airbag, a catheter, a first pressure sensor and a second pressure sensor; the airbag is used to be placed in a door body cavity to be detected, and forms an air pressure shock in the door body cavity to be detected by its own explosion; the airbag is detachably connected to the catheter; the catheter provides an air guide channel for the airbag, and the catheter is provided with an ignition mechanism for causing the airbag to burst; the first pressure sensor is built into the airbag cavity, and is used to sense pressure changes in the airbag cavity: the second pressure sensor is arranged on the outside of the airbag, and is used to be placed in the door body cavity to be detected, so as to detect pressure changes in the door body cavity to be detected; the first pressure sensor and the second pressure sensor are both connected to a pressure collector through wires; the pressure collector is used to analyze the sensing values ​​of the first pressure sensor and the second pressure sensor.

[0008] By adopting the above technical solution, the door air tightness test can be completed simply and efficiently under a conventional test environment. The airbag in the device is the only consumable part and can be made of common balloons in daily life. Compared with professional airbags or other high-cost high-pressure equipment, it is inexpensive and easy to purchase. In addition, the detection using this device does not require special equipment and complicated operations, and can quickly generate a pressure change curve to accurately evaluate the sealing performance of the door. It is particularly suitable for OEMs to optimize and verify the door design in the early stages of vehicle development, effectively reducing testing costs and experimental difficulty, and improving R&D efficiency.

[0009] Optionally, the catheter is made of a flexible material, and a hard fixing ring is provided at the front end of the catheter; the airbag is sleeved on the fixing ring.

[0010] By adopting this technical solution, the conduit is constructed of a flexible material, adaptable to door cavities of varying shapes and sizes, ensuring flexible placement and adjustment of the airbag within the cavity. A rigid retaining ring at the front not only facilitates stable installation of the airbag but also ensures a tight seal and stability during inflation, preventing accidental dislodgment or displacement. This design makes the test device more reliable and practical, improving the accuracy and repeatability of test results.

[0011] Optionally, the detonation mechanism is a puncture strip placed in the catheter tube.

[0012] By adopting the above technical solution, the puncture strip can be made of steel wire, copper wire, or a strip of plastic. By pushing the puncture strip, the airbag is punctured, ensuring that the airbag is reliably detonated when the predetermined pressure value is reached, thereby generating a transient pressure change. This design not only simplifies the detonation mechanism and reduces manufacturing costs, but also improves the overall reliability of the test device. Using the puncture strip as the detonation mechanism, its length and hardness can be flexibly adjusted to accommodate different types of catheters and airbags, enhancing the versatility and applicability of the device. Furthermore, the introduction of the puncture strip makes the detonation process more controllable, reduces the risk of accidental damage, and ensures the accuracy and consistency of test data.

[0013] Optionally, the detonation mechanism includes a tube body and a magnetic device, a slider is slidably connected in the tube cavity of the tube body, the upper part of the slider is provided with a needle, and the lower part is provided with a permanent magnet; the magnetic device includes an excitation core and a winding wound on the excitation core; the excitation core is fixed in the tube cavity, and the slider is fixed to the excitation core by the magnetic force of the permanent magnet, and after the winding is energized, the magnetic force generated by the excitation core drives the slider to move along the tube cavity toward the end away from the magnetic device.

[0014] By adopting the above technical solution, the detonating mechanism uses magnetic force to drive the slider to move, so that the needle quickly pierces the airbag, generating an instantaneous change in air pressure, and can achieve accurate measurement of the air tightness of the car door. Specifically, the magnetic field generated by energizing the winding drives the slider to move, ensuring that the needle accurately penetrates the airbag, thereby improving the reliability and repeatability of the test; the slider moves rapidly along the lumen under the action of the magnetic force, and the needle pierces the airbag almost instantly, achieving the purpose of quickly releasing the air pressure, simulating the situation of the airbag rupture during an actual collision; the entire process does not require human intervention, reducing the influence of human factors, and ensuring the safety and efficiency of the test; because the detonating mechanism moves very quickly and controllably, the first pressure sensor and the second pressure sensor can synchronously capture the pressure changes inside and outside the airbag, thereby providing more accurate air tightness evaluation data. In summary, the detonating mechanism not only improves the accuracy and reliability of the test, but also greatly simplifies the operating process and reduces the testing cost.

[0015] Further optionally, a mounting groove is provided at the lower end of the slider, the permanent magnet is fixed in the mounting groove, and an elastic pad is provided at the lower end of the tube body.

[0016] By adopting this technical solution, a mounting slot is provided at the bottom of the slider to secure the permanent magnet, ensuring its stability and reliability, preventing it from falling off during use. Furthermore, an elastic pad is added to the bottom of the tube to effectively cushion the impact of the slider during movement, extending the device's service life and ensuring the slider maintains a stable position when not triggered, improving the reliability of the detonation mechanism.

[0017] Further optionally, the magnetic device is electrically connected to a pressure collector, and when the sensing value read by the first pressure sensor reaches a preset value, the control unit built into the pressure collector starts the magnetic device to drive the needle to move.

[0018] By adopting this technical solution, the detonation mechanism is automatically triggered when the pressure inside the airbag reaches a preset value, ensuring that the airbag bursts at the optimal time, thereby generating a stable air pressure shock. This automated control not only improves the accuracy and reliability of the test, but also simplifies the operation process and reduces errors caused by human intervention.

[0019] Optionally, the fixing ring is provided with a clamping mechanism for fixing the airbag, the clamping mechanism includes a conical sleeve fixed on the fixing ring and a locking sleeve slidably connected to the fixing ring, the inner wall of the locking sleeve is provided with a locking ring adapted to the conical sleeve, and the inner wall of the locking sleeve is also provided with a first clamping ring; the fixing ring is provided with a second clamping ring, and a reset elastic member is provided between the second clamping ring and the first clamping ring to drive the locking ring close to the conical sleeve.

[0020] By adopting this technical solution, the balloon is effectively secured to the catheter, ensuring it does not fall off during inflation. The clamping mechanism design ensures a more secure and reliable balloon installation, improving the safety and accuracy of the testing process. Furthermore, the coordinated design of the locking sleeve and tapered sleeve allows for easy adjustment of the locking force to accommodate balloons of varying sizes and shapes, enhancing the versatility and flexibility of the device. The presence of a resilient reset element ensures that the locking sleeve remains locked unless subject to external forces, preventing accidental release.

[0021] Optionally, a closing head is provided at the tail end of the catheter, a wire hole is provided at the end of the closing head for the wire to pass through, and a sealing filler is provided between the wire and the wire hole; an air guide connector connected to the catheter pipe is provided on the side wall of the closing head.

[0022] By adopting this technical solution, the catheter tail end is ensured to be sealed and airtight, preventing gas leakage from affecting the accuracy of test results. Furthermore, the wire holes and sealing filler provided on the sealing head ensure safe wire transmission and prevent external interference. Furthermore, the design of the gas guide connector allows gas to enter the catheter smoothly, improving the ease of operation and reliability of the test device.

[0023] Optionally, a one-way valve is provided at the front end of the catheter.

[0024] By adopting this technical solution, the one-way valve at the front end of the catheter ensures that gas can only enter the airbag and cannot flow out, thus ensuring the stability of the airbag during inflation. When the airbag is deployed, the one-way valve also prevents external air from suddenly rushing into the catheter, causing pressure fluctuations that affect the accuracy of test results. This design improves the reliability and test accuracy of the entire test device.

[0025] A method for detecting the air tightness of a vehicle door, using any of the above-mentioned testing devices for detecting the air tightness of a vehicle door, specifically comprising the following steps:

[0026] Door body sealing: Except for the existing pressure sensor installation hole, the test hole for the conduit, and the rainwater drainage hole, all other openings are sealed with plugs to simulate the sealing state of the door body after the interior panel is installed;

[0027] The device is installed by placing the airbag in the door cavity to be tested and installing the second pressure sensor on the existing pressure sensor mounting hole;

[0028] Catheter sealing: Use a plug to seal the gap between the catheter and the test hole;

[0029] The airbag guides gas into the trachea until the sensing value of the first pressure sensor in the airbag reaches a preset value;

[0030] The airbag deploys, and the deployment mechanism deploys the airbag;

[0031] Data analysis: The pressure collector reads the sensing values ​​of the first pressure sensor and the second pressure sensor, and analyzes the curve of the sensing values ​​changing with time to obtain the air tightness test results of the door to be tested.

[0032] The above technical solution not only simplifies the testing process and improves testing efficiency, but also provides important data support for OEMs in the early stages of design, helping to optimize door sealing performance and enhance vehicle safety. It also effectively assesses door airtightness in the early stages of development without relying on expensive ultra-high pressure equipment, reducing testing cost and complexity. Specifically, by sealing all door openings except for specific ones, the sealing conditions experienced in actual use can be simulated, ensuring the accuracy of test results. The airbag is placed within the door cavity, and a second pressure sensor is installed at a predetermined location, effectively monitoring pressure changes within the door. The gap between the conduit and the test hole is sealed to prevent gas leakage, ensuring stable and reliable air pressure during testing. The airbag is inflated to a preset pressure, creating a high pressure state and providing the necessary conditions for the pressure shock after detonation. The high pressure within the airbag is rapidly released through the detonator, generating a transient atmospheric pressure change, simulating the pressure change process during a collision. A pressure collector reads and analyzes the data from the two pressure sensors, comparing the pressure change curves of different doors to accurately assess the airtightness of the door.

[0033] In summary, this application includes at least one of the following beneficial technical effects:

[0034] 1. This application uses a balloon and its internal and external pressure sensors to rapidly generate large pressure changes within the door cavity, thereby accurately measuring the door's airtightness. This solves the problem of traditional methods being unable to simulate real-world collision scenarios.

[0035] 2. The ingenious design of the detonation mechanism in the test device of this application ensures that the balloon will rupture quickly after being inflated to the predetermined pressure, thereby generating an instantaneous high-pressure shock, thereby improving the reliability and accuracy of the test;

[0036] 3. The entire testing process of this application is simple and easy, without the need for special equipment and complicated operating procedures, which reduces the testing cost and difficulty. It is particularly suitable for evaluating and optimizing the air tightness of vehicle doors in the early stages of vehicle development. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 2 is a schematic structural diagram of the testing device for detecting the air tightness of a vehicle door according to the first embodiment;

[0038] Figure 2 is a schematic structural diagram of the testing device for detecting the air tightness of a vehicle door in the second embodiment;

[0039] Figure 3 2 is a schematic structural diagram of the testing device for detecting the air tightness of a vehicle door in the third embodiment;

[0040] Figure 4is a schematic structural diagram of the detonation mechanism described in Example 3;

[0041] Figure 5 It is a partial structural diagram of the detonation mechanism described in Example 3;

[0042] Figure 6 Schematic diagram of the structure of the one-way valve in Example 3;

[0043] Figure 7 Schematic diagram of the structure of the sealing cover head in Example 3;

[0044] Figure 8 2 is a schematic structural diagram of the testing device for detecting the air tightness of a vehicle door according to the fourth embodiment;

[0045] Figure 9 is a schematic structural diagram of the clamping mechanism described in Example 4;

[0046] Figure 10 is a schematic structural diagram of the first clasp in Example 4;

[0047] Figure 11 It is a schematic diagram of the arrangement structure of the testing device for detecting the air tightness of a vehicle door and the door body to be detected described in Example 5.

[0048] In the figure: 1. airbag; 2. catheter; 20. pipeline; 21. fixing ring; 22. one-way valve; 23. detonating mechanism; 231. tube body; 2311. tube cavity; 2312. threaded portion; 232. magnetic device; 2321. excitation core; 2322. winding; 233. slider; 234. needle; 235. permanent magnet; 236. elastic pad; 237. fiber ring; 24. clamping mechanism; 241. conical sleeve; 242. locking sleeve; 243. first snap ring; 244. second snap ring; 245. reset elastic member; 246. locking ring; 25. closing head; 251. wire hole; 252. air guide connector; 3. first pressure sensor; 4. second pressure sensor; 5. wire; 6. pressure collector; 7. puncture strip; 71. sponge; 8. string; 9. door body to be detected. DETAILED DESCRIPTION

[0049] The following will clearly and completely describe the technical solutions of the various embodiments of the present application in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of this application.

[0050] Example 1

[0051] Reference Figure 1, an embodiment of the present application discloses a test device for detecting the air tightness of a vehicle door, comprising an airbag 1, a catheter 2, a first pressure sensor 3 and a second pressure sensor 4, wherein the airbag 1 is used to be placed in the cavity of the door body to be detected, and forms an air pressure shock in the cavity of the door body to be detected by its own explosion; the airbag 1 is detachably connected to the catheter 2 by being tied with a thin rope 8, the catheter 2 provides an air guide channel for the airbag 1, and the catheter 2 is provided with an ignition mechanism 23 for causing the airbag 1 to burst; the first pressure sensor 3 is built into the cavity of the airbag 1, and is used to sense the pressure change in the cavity of the airbag 1; the second pressure sensor 4 is arranged on the outside of the airbag 1, and is used to be placed in the cavity of the door body to be detected to detect the pressure change in the cavity of the door body to be detected; the first pressure sensor 3 and the second pressure sensor 4 are both connected to the pressure collector 6 through a wire 5; the pressure collector 6 is used to analyze the sensing values ​​of the first pressure sensor 3 and the second pressure sensor 4.

[0052] Specifically, refer to Figure 1 The catheter 2 is made of flexible materials such as medical rubber tubes or PVC water pipes. These materials have good flexibility and wear resistance and are suitable for a variety of test environments, especially for test scenarios that require frequent bending and movement. Such materials can effectively extend the service life of the catheter 2. A fixing ring 21 is provided at the head of the catheter 2, which can be fixed by bonding. The fixing ring 21 can not only serve as a support point for the airbag 1, but also enhance the strength of the front end of the catheter 2 to prevent the catheter 2 from deforming under high pressure. In order to facilitate the installation of the first pressure sensor 3, a threaded hole or a threaded seat is provided on the fixing ring 21. The first pressure sensor 3 is threadedly connected to the threaded hole or the threaded seat. During the installation process, the threaded connection can be sealed with raw tape.

[0053] Reference Figure 1 The detonating mechanism 23 is a puncture strip 7 placed in the tube 20 of the catheter 2. When in use, one end of the puncture strip 7 is extended out of the catheter 2 and the other end is inserted into the interior of the airbag 1.

[0054] Reference Figure 1 After the inflation is completed, the tester pinches the tail end of the catheter 2 by hand to seal the catheter 2, and quickly pulls the puncture strip 7 to make its tip pierce the airbag 1, thereby achieving an instantaneous burst of the airbag 1 to form an air pressure shock in the portal cavity to be tested; in order to prevent the tip of the puncture strip 7 from accidentally touching the airbag 1 during the inflation process, the sponge 71 can be wrapped around the tip of the puncture strip 7.

[0055] The implementation principle of this embodiment is: the airbag 1 is fixed and detonated through a simple mechanical structure, so that the airbag 1 can produce instantaneous air pressure changes in the cavity of the door body to be detected; this design is not only simple and easy, but also low-cost and suitable for large-scale applications.

[0056] Example 2

[0057] Reference Figure 2 The difference between this embodiment and the first embodiment is that the airbag 1 adopts a multi-layer overlapping structure. The airbag 1 can be composed of two or more thin layers of airbags 1. Each layer of airbags 1 can be tightly bonded together by adhesive or hot melt. The advantage of this design is that it can increase the maximum pressure-bearing capacity of the airbag 1, extend the service life of the airbag 1, and also reduce the cost of a single test.

[0058] Reference Figure 2 The layers of the airbag 1 can also be made of different materials. For example, one layer can be made of natural rubber and the other layer can be made of neoprene. This can fully utilize the advantages of various materials and improve the overall performance of the airbag 1. The number of layers of the airbag 1 can be flexibly adjusted according to actual test requirements. Generally, three or four layers can meet the requirements of most test scenarios.

[0059] The implementation principle of this embodiment is: through the design of the multi-layer airbag 1, the maximum pressure bearing capacity of the airbag 1 is significantly improved, the service life of the airbag 1 is extended, and at the same time the testing cost is reduced and the testing efficiency is improved.

[0060] Example 3

[0061] Reference Figure 3~Figure 4 The difference between this embodiment and the first embodiment is that the detonation mechanism 23 adopts a more complex magnetic device 232, including a tube body 231 and a magnetic device 232. A slider 233 is slidably connected in the tube cavity 2311 of the tube body 231. The upper part of the slider 233 is provided with a needle 234, and the lower part is provided with a permanent magnet 235; the magnetic device 232 includes an excitation core 2321 and a winding 2322 wound on the excitation core 2321; the excitation core 2321 is fixed in the tube cavity 2311, and the slider 233 is fixed to the excitation core 2321 by the magnetic force of the permanent magnet 235. When the winding 2322 is energized, the excitation core The magnetic force generated by 2321 drives the slider 233 to move along the tubular cavity 2311 toward the end away from the magnetic device 232. The advantage of this design is that it can realize remote control detonation, reduce the risk of manual intervention, and improve the reliability and safety of the test; in order to prevent the slider 233 from slipping out of the tubular body 231, a limiting ring is fixed on the top of the tubular body 231, and the inner diameter of the limiting ring is larger than the diameter of the main body of the needle 234 to ensure that the needle 234 can pass through the fiber ring 237; in order to facilitate installation, a threaded hole or a threaded seat is provided on the fixing ring 21, and the outer wall of the head of the tubular body 231 is provided with a threaded portion 2312 adapted to the threaded hole or the threaded seat.

[0062] Specifically, refer to Figure 5The lower end of the slider 233 is provided with a mounting groove, the permanent magnet 235 is fixed in the mounting groove, and the lower end of the tube body 231 is provided with an elastic pad 236. This design can ensure that the slider 233 remains stable in a stationary state to avoid false triggering; the magnetic device 232 is electrically connected to the pressure collector 6, and the built-in control unit of the pressure collector 6 starts the magnetic device 232 when the sensing value of the first pressure sensor 3 read reaches a preset value, driving the needle 234 to move, so that an automated detonation process can be realized, further improving the accuracy and reliability of the test.

[0063] Reference Figure 6 In order to effectively prevent the backflow of gas during the inflation process, ensure that the airbag 1 can be smoothly inflated to the predetermined pressure, and improve the accuracy and stability of the test, a one-way valve 22 is provided at the front end of the catheter 2. The function of the one-way valve 22 is to prevent the backflow of gas during the inflation process, ensuring that the airbag 1 can be smoothly inflated to the predetermined pressure. Among them, the design of the one-way valve 22 can adopt a spring-loaded ball valve or a diaphragm valve, etc., as long as it can meet the anti-backflow requirements.

[0064] Reference Figure 7 The end of the conduit 2 is provided with a closed head 25. A wire hole 251 is provided at the end of the closed head 25 for the wire 5 to pass through. A sealing filler is provided between the wire 5 and the wire hole 251 to prevent gas leakage. A gas connection 252 is provided on the side wall of the closed head 25, which communicates with the conduit 20 of the conduit 2, facilitating access to an external gas source.

[0065] The implementation principle of this embodiment is: by introducing the magnetic device 232, the function of automatic detonation of the device is realized. Of course, the wire 5 of the magnetic device 232 can also be connected to an independent power line switch to realize the function of remote control detonation. Generally speaking, the magnetic device 232 greatly improves the safety and automation level of the test and reduces the influence of human error. It should be pointed out that the needle 234 in this embodiment can also be driven by other means to prompt the needle 234 to pierce the airbag to detonate the airbag, such as installing a pneumatic or electric telescopic rod at the lower end of the needle 234.

[0066] Example 4

[0067] Reference Figures 8 to 10The difference between this embodiment and the first embodiment is that a clamping mechanism 24 for fixing the airbag 1 is provided on the fixing ring 21. The clamping mechanism 24 includes a tapered sleeve 241 fixed on the fixing ring 21 and a locking sleeve 242 slidably connected to the fixing ring 21. The inner wall of the locking sleeve 242 is provided with a locking ring 246 adapted to the tapered sleeve 241. The tapered sleeve 241 and the locking ring 246 can be made of flexible rubber to enhance the contact tightness with the airbag 1 and ensure the sealing effect. The sleeve 241 can be fixed to the fixed ring 21 by bonding; the inner wall of the locking sleeve 242 is also provided with a first groove, in which a first snap ring 243 is installed, and the fixing ring 21 is provided with a second groove, in which a second snap ring 244 is provided, and between the second snap ring 244 and the first snap ring 243 is provided a reset elastic member 245 for driving the locking ring 246 close to the conical sleeve 241. This design can ensure that the airbag 1 is firmly fixed on the catheter 2, and at the same time facilitates the rapid replacement of a new airbag 1.

[0068] When installing the airbag 1, it is only necessary to move the locking sleeve 242 to expose the conical sleeve 241, then put the airbag 1 outside the conical sleeve 241, and then loosen the locking sleeve 242. Under the action of the reset elastic member 245, the locking sleeve 242 clamps the air inlet section of the airbag 1 between the conical sleeve 241 and the locking ring 246.

[0069] The implementation principle of this embodiment is: by using flexible materials to make the catheter 2, not only the durability and flexibility of the catheter 2 are improved, but also the sealing performance of the catheter 2 is enhanced, making the entire testing device more stable and reliable.

[0070] Example 5

[0071] Reference Figure 11 The present application also discloses a method for testing the air tightness of a vehicle door, using the testing device for testing the air tightness of a vehicle door described in any of the above embodiments, and the specific steps include:

[0072] Door body sealing: except for the existing pressure sensor installation hole, the test hole for passing the conduit 2, and the rainwater drainage hole of the door body 9 to be tested, all other openings are sealed with plugs to simulate the sealing state of the door body 9 to be tested after the interior panel is installed;

[0073] The device is installed by placing the airbag 1 in the cavity of the door body 9 to be detected, and installing the second pressure sensor 4 on the existing pressure sensor mounting hole;

[0074] The conduit 2 is sealed by using a plug to seal the gap between the conduit 2 and the test hole;

[0075] The airbag 1 guides gas into the trachea until the sensing value of the first pressure sensor 3 in the airbag 1 reaches a preset value;

[0076] The airbag 1 is detonated, and the detonation mechanism 23 detonates the airbag 1;

[0077] Data analysis: The pressure collector 6 reads the sensing values ​​of the first pressure sensor 3 and the second pressure sensor 4, and analyzes the curve of the sensing values ​​changing with time to obtain the airtightness test result of the door body 9 to be tested.

[0078] Specifically, during the door sealing step, obstructions can be made using various methods, such as sealing tape, plugs, and clips, to ensure that all non-essential openings are completely sealed. During the device installation step, airbag 1 should be placed as centrally as possible to ensure uniform distribution of pressure changes. During the catheter 2 sealing step, the gap between catheter 2 and the test hole should be sealed by applying silicone or foam glue to prevent gas leakage. During the airbag 1 induction step, air should be slowly inflated, and leaks should be gradually checked. Ensure that the internal pressure of airbag 1 reaches the preset value before proceeding to the next step. During the airbag 1 detonation step, airbag 1 can be detonated manually, automatically, or remotely, and the response of the pressure sensor should be observed. During the data analysis step, the curve of the sensor value changing over time should be carefully analyzed to identify key nodes and determine whether the door's airtightness meets the requirements.

[0079] The implementation principle of the embodiment of the present application is: through detailed testing method steps, it is ensured that each link can be executed accurately and correctly, and finally reliable test results are obtained, providing a scientific basis for the optimization of the air tightness of the vehicle door.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present application.

Claims

1. A testing device for detecting the air tightness of a vehicle door, characterized in that: The invention comprises an airbag (1), a catheter (2), a first pressure sensor (3) and a second pressure sensor (4); the airbag (1) is used to be placed in the cavity of the door body (9) to be detected, and forms an air pressure shock in the cavity of the door body (9) to be detected by bursting itself; the airbag (1) is detachably connected to the catheter (2); the catheter (2) provides an air guide channel for the airbag (1), and the catheter (2) is provided with a detonating mechanism (23) for causing the airbag (1) to burst; the first pressure sensor (3) is built in The airbag (1) cavity is used to sense pressure changes in the airbag (1) cavity. The second pressure sensor (4) is arranged on the outside of the airbag (1) and is placed in the cavity of the door body (9) to be detected to detect pressure changes in the cavity of the door body (9) to be detected. The first pressure sensor (3) and the second pressure sensor (4) are both connected to the pressure collector (6) through a wire (5). The pressure collector (6) is used to analyze the sensing values ​​of the first pressure sensor (3) and the second pressure sensor (4).

2. The testing device for detecting the air tightness of a vehicle door according to claim 1, characterized in that: The catheter (2) is made of a flexible material, and a hard fixing ring (21) is provided at the front end of the catheter (2); the airbag (1) is sleeved on the fixing ring (21).

3. The testing device for detecting the air tightness of a vehicle door according to claim 1, characterized in that: The detonation mechanism (23) is a puncture strip (7) placed in the conduit (20) of the catheter (2).

4. The testing device for detecting the air tightness of a vehicle door according to claim 1, characterized in that: The detonating mechanism (23) comprises a tube body (231) and a magnetic device (232); a slider (233) is slidably connected in the tube cavity (2311) of the tube body (231); a needle (234) is provided on the upper portion of the slider (233), and a permanent magnet (235) is provided on the lower portion; the magnetic device (232) comprises an excitation core (2321) and a winding (2322) wound around the excitation core (2321); the excitation core (2321) is fixed in the tube cavity (2311); the slider (233) is fixed to the excitation core (2321) by the magnetic force of the permanent magnet (235); and after the winding (2322) is energized, the magnetic force generated by the excitation core (2321) drives the slider (233) to move along the tube cavity (2311) toward one end away from the magnetic device (232).

5. The testing device for detecting the air tightness of a vehicle door according to claim 4, characterized in that: The lower end of the slider (233) is provided with a mounting groove, the permanent magnet (235) is fixed in the mounting groove, and the lower end of the tube body (231) is provided with an elastic pad (236).

6. The testing device for detecting the air tightness of a vehicle door according to claim 4, characterized in that: The magnetic device (232) is electrically connected to the pressure collector (6). When the sensing value read by the first pressure sensor (3) reaches a preset value, the control unit built into the pressure collector (6) starts the magnetic device (232) to operate and drives the needle (234) to move.

7. The testing device for detecting the air tightness of a vehicle door according to claim 2, characterized in that: The fixing ring (21) is provided with a clamping mechanism (24) for fixing the airbag (1), the clamping mechanism (24) comprising a tapered sleeve (241) fixed on the fixing ring (21) and a locking sleeve (242) slidably connected to the fixing ring (21), the inner wall of the locking sleeve (242) being provided with a locking ring (246) adapted to the tapered sleeve (241), and the inner wall of the locking sleeve (242) being further provided with a first snap ring (243); the fixing ring (21) being provided with a second snap ring (244), and a reset elastic member (245) being provided between the second snap ring (244) and the first snap ring (243) for driving the locking ring (246) close to the tapered sleeve (241).

8. The testing device for detecting the air tightness of a vehicle door according to claim 1, characterized in that: The tail end of the catheter (2) is provided with a closed head (25), the end of the closed head (25) is provided with a wire hole (251) for the wire (5) to pass through, and a sealing filler is provided between the wire (5) and the wire hole (251); the side wall of the closed head (25) is provided with an air guide connector (252) that is connected to the pipeline (20) of the catheter (2).

9. The testing device for detecting the air tightness of a vehicle door according to claim 1, characterized in that: A one-way valve (22) is provided at the front end of the conduit (2).

10. A method for detecting the air tightness of a vehicle door, characterized in that: The testing device for detecting the air tightness of a vehicle door according to any one of claims 1 to 9 is used, and the specific steps include: The door body is sealed. Except for the pressure sensor installation hole, the test hole for penetrating the conduit (2), and the rainwater drainage hole of the door body (9) to be tested, the remaining openings are sealed with plugs to simulate the sealing state of the door body (9) to be tested after the interior panel is installed; The device is installed by placing the airbag (1) in the cavity of the door body (9) to be detected, and installing the second pressure sensor (4) on the existing pressure sensor installation hole; The conduit (2) is sealed by using a plug to seal the gap between the conduit (2) and the test hole; The air bag (1) guides gas to introduce gas into the airway until the sensing value of the first pressure sensor (3) in the air bag (1) reaches a preset value; The airbag (1) is detonated, and the detonating mechanism (23) detonates the airbag (1); Data analysis: The pressure collector (6) reads the sensing values ​​of the first pressure sensor (3) and the second pressure sensor (4), and analyzes the curve of the sensing values ​​changing with time to obtain the airtightness test result of the door body (9) to be tested.

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