Sealing performance test tool, test device and test method

Abstract

A sealing performance test tool (1), comprising a first housing (10) and a second housing (20), the first housing (10) having a first surface (11), the second housing (20) having a second surface (21), the second surface (21) and the first surface (11) being oppositely arranged, and a first gap (50) being formed between the second surface (21) and the first surface (11); the first housing (10) is detachably connected to the second housing (20), a test chamber (60) being defined by the first housing (10) and the second housing (20), and the first gap (50) being communicated with the test chamber (60). The sealing performance test tool (1) can detect the sealing performance between a skateboard chassis and an upper vehicle body of a vehicle. Further provided are a sealing performance test device and test method.

Description

Sealing performance testing fixtures, testing apparatus and testing methods

[0001] This application claims priority to Chinese Patent Application No. 2024105535459, filed on May 6, 2024, entitled "Sealing Performance Testing Fixture, Testing Apparatus and Testing Method", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of waterproof sealing technology, and more specifically, to a sealing performance testing fixture, testing device, and testing method. Background Technology

[0003] In related technologies, most vehicles have a body and chassis as a single integrated structure. With the development of automotive technology, a new type of chassis called a skateboard chassis has emerged. This type of chassis is independent of the body, meaning that the chassis and body are separate structures, achieving decoupled development of the chassis and body.

[0004] The chassis and body are typically sealed using seals, and the quality of this seal affects vehicle safety, durability, and comfort. However, in actual production, due to the large size of both the chassis and body, it is difficult to test the sealing performance between them. Summary of the Invention

[0005] The purpose of this application is to provide a sealing performance testing fixture, testing device and testing method, including but not limited to solving the problem of difficulty in testing the sealing performance between the vehicle body and chassis in related technologies.

[0006] The technical solution adopted in the embodiments of this application is:

[0007] According to a first aspect of this application, a sealing performance testing fixture is provided, comprising:

[0008] A first housing, the first housing having a first surface, the first surface being used to simulate the connection surface of the chassis for connection with the vehicle body;

[0009] The second housing has a second surface, which is used to simulate the connection surface of the vehicle body for connection with the chassis. The second surface is arranged opposite to the first surface, and a first gap is formed between the second surface and the first surface.

[0010] The first housing and the second housing are detachably connected, and a test cavity is formed between the first housing and the second housing. The first gap communicates with the test cavity.

[0011] In this sealing performance testing fixture, at least a portion of the connection surface between the chassis and the vehicle body can be simulated via the first surface of the first housing, and at least a portion of the connection surface between the vehicle body and the chassis can be simulated via the second surface of the second housing. The first gap simulates at least a portion of the gap between the chassis and the vehicle body. Waterproofing tests can be performed using this fixture. A seal for installation between the chassis and the vehicle body is installed in the first gap, thus simulating the state after a seal is installed between the chassis and the vehicle body. Sealing performance tests are then conducted using this fixture. In the waterproofing test, the presence of water in the test chamber indicates whether the seal provides a good waterproof seal between the first and second housings. The test structure can be used to evaluate the sealing performance between the vehicle body and the chassis. This sealing performance testing fixture can simulate the vehicle body and chassis, eliminating the need for direct waterproofing tests on the vehicle body and chassis, making the testing process more convenient and simple.

[0012] In one possible design, the first gap has a flat area, and the areas on the first and second surfaces opposite to the flat area are both flat surfaces.

[0013] In this setup, since the sides of the vehicle body and chassis typically include flat surfaces, and the sides of the chassis and vehicle body typically include flat surfaces, a flat area is formed between the flat surfaces of the vehicle body and the chassis. The flat area of ​​the sealing performance testing fixture can simulate the flat area between the vehicle body and chassis, thereby evaluating the sealing performance between the vehicle body and chassis that has a flat area.

[0014] In one possible design, the first gap has a first sloping area, and the areas of the first surface and the second surface opposite to the first sloping surface are both the first sloping surface, which is inclined relative to the straight surface.

[0015] In this configuration, the first sloping area can simulate the first sloping area between the vehicle body and the chassis, thereby evaluating the sealing performance between the vehicle body and the chassis with the first sloping area.

[0016] In one possible design, the first gap has a second slope area, and the areas of the first and second surfaces opposite to the second slope area are both second slopes. The second slope is inclined relative to the flat surface, and the inclination direction of the second slope is opposite to that of the first slope.

[0017] In this configuration, the first and second slope areas with different inclination directions can simulate the first and second slope areas with different inclination directions between the vehicle body and the chassis, thereby evaluating the sealing performance between the vehicle body and the chassis with different inclination directions.

[0018] In one possible design, the first gap has a stepped area, and the area of ​​at least one of the first and second surfaces opposite the stepped area is the stepped surface.

[0019] In this configuration, the stepped area can simulate the stepped area between the vehicle body and the chassis, thereby evaluating the sealing performance between the vehicle body and the chassis with the stepped area.

[0020] In one possible design, the first gap has a rounded corner area, and the areas on the first and second surfaces opposite to the rounded corner area are both curved surfaces.

[0021] In this setup, the rounded corner area can simulate the rounded corner area between the vehicle body and the chassis, thereby evaluating the sealing performance between the vehicle body and the chassis with the rounded corner area.

[0022] In one possible design, the sealing performance testing fixture also includes a pad having a septum portion located between a first surface and a second surface, and the septum portion being located on the side of the first gap away from the test chamber, the septum portion being used to define the height of the first gap.

[0023] In this configuration, the spacer portion of the pad allows the height of the first gap to remain stable.

[0024] In one possible design, the sealing performance testing fixture includes multiple pad assemblies, each pad assembly including at least one pad, the pads in the same pad assembly having the same height of the spacer portion, the pads in different pad assemblies having different heights of the spacer portion, and one of the pad assemblies being installed between a first surface and a second surface.

[0025] In this setup, multiple pad components can simulate the state of the seal when the first gap is at different heights, thereby enabling the testing of the waterproof performance of the seal under various compression conditions.

[0026] In one possible design, there are three spacer assemblies: a first spacer assembly, a second spacer assembly, and a third spacer assembly. The height of the spacer portion in the first spacer assembly is H1, the height of the spacer portion in the second spacer assembly is H2, and the height of the spacer portion in the third spacer assembly is H3. The preset value of the height of the first gap is L, and the tolerance fluctuation range of the height dimension of the first gap is ±S. Then, H1 = L, H2 = LS, and H3 = L + S.

[0027] In this configuration, the first pad assembly simulates the compression state of the seal when the first gap is at a preset value, the second pad assembly simulates the low value of the first gap within the error range, i.e., the state when the seal is over-pressurized, and the third pad assembly simulates the high value of the first gap within the error range, i.e., the state when the seal is under-pressurized.

[0028] In one possible design, the pad assembly includes multiple pads spaced circumferentially in a first gap.

[0029] In this configuration, the spaced-apart pads save on manufacturing costs, and the spaced-apart pads facilitate a relatively stable connection between the first and second housings.

[0030] In one possible design, the pad includes a connecting portion connected to a spacer portion, and the first housing is provided with a limiting groove, with the connecting portion at least partially located within the limiting groove.

[0031] In this configuration, the connection part and the limiting groove cooperate to facilitate the limiting installation of the pad during the connection of the first housing, the second housing and the pad.

[0032] In one possible design, the first housing, the second housing, and the pad are connected by a locking structure.

[0033] In this configuration, the first housing, the second housing, and the pad are connected by a locking structure, thus eliminating the need to install a connection structure on the first or second housing, simplifying the structure of the first and second housings.

[0034] In one possible design, the first housing has a first flange, the second housing has a second flange, the first surface is located on the side of the first flange facing the second flange, and the second surface is located on the side of the second flange facing the first flange.

[0035] In this configuration, the total height of the first flange, the second flange, and the pad is relatively small, which facilitates the connection of the locking structure.

[0036] In one possible design, the first flange is provided with a first mounting hole, the pad is provided with a second mounting hole, and the second flange is provided with a third mounting hole. The first mounting hole, the second mounting hole, and the third mounting hole are interconnected, and the locking structure is sequentially inserted through the first mounting hole, the second mounting hole, and the third mounting hole.

[0037] In this configuration, the locking structure securely connects the first flange, the pad, and the second flange by passing through the first assembly hole, the second assembly hole, and the third assembly hole, making the fixing method simple and convenient.

[0038] In one possible design, the first mounting hole has a first opening, the second mounting hole has a second opening, and the third mounting hole has a third opening. The first opening is located on the edge region of the first flange away from the test cavity. The second and third openings are both connected to the first opening, and the second and third openings are both oriented in the same direction as the first opening.

[0039] In this configuration, the locking structure can be pushed into the first mounting hole, the second mounting hole, and the third mounting hole through the first opening, the second opening, and the third opening, thereby enabling the quick disassembly and installation of the locking structure.

[0040] In one possible design, a test patch that changes color when exposed to water is placed inside the test chamber.

[0041] In this setup, the test patch changes color when it comes into contact with water, making it easy and quick to determine whether water has entered the test chamber, which is beneficial for waterproof performance evaluation.

[0042] In one possible design, test patches are placed at both a first distance and a second distance from the first gap inside the test chamber, with the first distance being smaller than the second distance.

[0043] In this setup, the water inlet distance in the test chamber can be easily determined by checking whether the test patch at the first distance changes color and whether the patch at the second distance changes color.

[0044] In one possible design, the sealing performance testing fixture includes a counterweight structure disposed within the test chamber.

[0045] In this setup, the addition of a counterweight structure helps to keep the sealing performance testing fixture in the set position in the water, and the counterweight structure facilitates waterproof testing.

[0046] In one possible design, at least one of the first housing and the second housing is provided with an injection port and a sealing structure. The injection port is connected to the test chamber, and the sealing structure is detachably connected to the injection port and can be adapted to seal the injection port.

[0047] In this setup, the vent hole can be used to inflate the test chamber to test air tightness. After covering the vent hole with the sealing structure, the sealing performance testing fixture can be used to test waterproof performance.

[0048] According to a second aspect of this application, a testing apparatus is provided, including a water tank and a sealing performance testing fixture as provided in any of the above technical solutions, wherein the water tank is used to contain the sealing performance testing fixture.

[0049] In this testing device, a water tank is used to hold water, and a sealing performance testing fixture is used to simulate the vehicle body and chassis. By conducting a waterproof test in the water tank using the sealing performance testing fixture, the waterproof test of the vehicle body and chassis can be simulated, thereby enabling the evaluation of the waterproof performance between the vehicle body and chassis.

[0050] In one possible design, the water tank is detachably connected to the sealing performance testing fixture.

[0051] In this setup, the sealing performance testing fixture is detachably connected to the water tank, which helps to keep the sealing performance testing fixture in the set position inside the water tank, facilitating the waterproofing test.

[0052] According to a third aspect of this application, a testing method is provided, employing the sealing performance testing fixture provided by any of the above-described technical solutions. The method includes fixture installation and waterproof testing, wherein...

[0053] The tooling installation includes: fixing the seal to the first gap of the sealing performance testing tooling, and sealing the test chamber into a sealed chamber through the seal;

[0054] The waterproof test includes: placing the sealing performance test fixture with the seal installed in the water, so that the sealing performance test fixture with the seal installed is submerged at a first depth; after a first set time, removing the sealing performance test fixture with the seal installed, and checking whether water has entered the test chamber.

[0055] This testing method uses a first housing in a sealing performance testing fixture to simulate the chassis and a second housing to simulate the vehicle body. A seal is installed between the first and second housings, simulating the state where the seal is installed between the vehicle body and the chassis. Thus, the sealing performance testing fixture with the seal installed simulates the state where a seal is installed between the vehicle body and the chassis. By conducting a waterproof test on the sealing performance testing fixture with the seal installed, a waterproof test can be simulated on the vehicle body, chassis, and seal, thereby enabling the evaluation of the waterproof performance of the seal between the vehicle body and the chassis.

[0056] In one possible design, the tooling installation also includes:

[0057] A pad is installed between the first housing and the second housing, and the pad, the first housing, and the second housing are connected.

[0058] In this test method, the height of the first gap between the first housing and the second housing can be changed by using a pad, thereby allowing the waterproof performance of the seal under a certain set compression state to be evaluated.

[0059] In one possible design, waterproofing tests are conducted using a first pad assembly, a second pad assembly, and a third pad assembly, respectively.

[0060] By using pads of different heights, the condition of the seal within the tolerance range can be simulated, thus enabling a more comprehensive assessment of the seal's waterproof performance.

[0061] In one possible design, after the tooling is installed and before the waterproofing test is conducted, the method also includes conducting environmental testing.

[0062] In this testing method, the sealing performance testing fixture undergoes environmental testing before waterproofing testing, which can simulate the sealing performance between the chassis and body of a vehicle after a certain period of use.

[0063] In one possible design, environmental testing includes high and low temperature cycling testing, which includes:

[0064] The sealing performance testing fixture with the seal installed was placed in various environments with different temperatures and maintained for a set time.

[0065] In this testing method, the sealing performance testing fixture is placed in environments with different temperatures for a certain period of time before the waterproof test is conducted. This can simulate the state of the seal after use at different temperatures, so as to evaluate the waterproof performance of the seal after use in environments with different temperatures.

[0066] In one possible design, the high and low temperature cycling test includes high and low temperature cycling, which includes:

[0067] The sealing performance testing fixture with the seal installed is placed in a high-temperature environment and kept at high temperature for a specified time.

[0068] The sealing performance testing fixture with the seal installed is placed in a low-temperature environment and kept at a low temperature for a specified time.

[0069] The temperature in a high-temperature environment is higher than the temperature in a low-temperature environment.

[0070] In this testing method, the test fixture is placed in high-temperature and low-temperature environments for a certain period of time to simulate the state of the seal after being in a relatively harsh environment for a period of time, so as to evaluate the waterproof performance of the seal after being used in a relatively harsh environment for a period of time.

[0071] In one possible design, the high and low temperature cycling test includes high and low temperature cycling, which includes:

[0072] The sealing performance testing fixture with the seal installed is placed in a first environment and kept for a first set time;

[0073] The sealing performance test fixture with the seal installed is placed in a second environment and kept for a second set time;

[0074] The sealing performance test fixture with the seal installed is placed in a third environment and kept for a third set time;

[0075] The sealing performance test fixture with the seal installed is placed in the fourth environment and kept for the fourth set time;

[0076] The temperatures of the first environment, the second environment, the third environment, and the fourth environment are different.

[0077] In this testing method, the sealing performance testing fixture is placed in four different temperature environments for a certain period of time before the waterproof test is carried out. This can simulate the state of the seal after use at different temperatures, so as to evaluate the waterproof performance of the seal after use in four different temperature environments.

[0078] In one possible design, high and low temperature cycles are performed sequentially multiple times.

[0079] This testing method can simulate the state of a seal after a relatively long period of use, in order to evaluate the waterproof performance of the seal after a relatively long period of use.

[0080] In one possible design, the temperature of the second environment is greater than that of the first environment, the temperature of the third environment is less than that of the first environment, and the temperature of the fourth environment is greater than that of the first environment but less than that of the second environment.

[0081] In this testing method, the temperature of the first environment is higher than that of the third environment, but lower than that of the second and fourth environments. Therefore, the first temperature can be set as the baseline temperature. The second environment has the highest temperature and can be used to simulate the environment of high-heat areas of the vehicle (such as areas where batteries are installed). The third environment has a low temperature and can be used to simulate winter environments. The fourth environment has a relatively high temperature and can be used to simulate summer environments. This setup allows for the simulation of various conditions that a vehicle may experience during use through four different environments, enabling the waterproofing test to evaluate the waterproofing performance of the seals between the vehicle body and chassis after a period of use.

[0082] In one possible design, the temperature of the first environment is 20°C to 28°C, the temperature of the second environment is 60°C to 120°C, the temperature of the third environment is -50°C to -10°C, and the temperature of the fourth environment is 45°C to 55°C.

[0083] In this testing method, the temperature of the first environment is normal, the temperature of the second environment is high, the temperature of the third environment is low, and the temperature of the fourth environment is moderately high. The temperature range of the above four different environments can almost simulate the temperature range that the vehicle may experience during use, increasing the matching degree between the environmental test and the actual situation and improving the accuracy of the evaluation simulation.

[0084] In one possible design, the temperature of the first environment is 23℃, the temperature of the second environment is 90℃, the temperature of the third environment is -40℃, and the temperature of the fourth environment is 50℃.

[0085] In this testing method, the first environment is at room temperature, thus simulating normal temperature conditions (e.g., spring or autumn); the second environment is at a high temperature, simulating the environment of high-heat areas of the vehicle (e.g., areas where batteries are installed); the third environment is at a low temperature, simulating winter conditions; and the fourth environment is at a relatively high temperature, simulating summer conditions. This setup allows for the simulation of various conditions a vehicle might experience during use through four different environments, enabling the waterproofing test to evaluate the waterproofing performance of the seals between the vehicle body and chassis after a period of use.

[0086] In one possible design, after the sealing performance testing fixture with the seal installed is placed in the second environment for a second set time, and before the sealing performance testing fixture is placed in the third environment, the method further includes: switching the sealing performance testing fixture with the seal installed from the third environment to the first environment.

[0087] In this testing method, the first environment is used as the reference environment. After simulating the second environment, the sealing performance testing fixture is switched from the second environment to the first environment, that is, the sealing performance testing fixture is restored to the reference environment to facilitate subsequent environment switching.

[0088] In one possible design, after the sealing performance testing fixture with the seal installed is placed in the third environment and kept in the third set time, and before the sealing performance testing fixture with the seal installed is placed in the fourth environment, the design further includes: switching the sealing performance testing fixture with the seal installed from the third environment to the first environment.

[0089] In this testing method, the first environment is used as the reference environment. After simulating the third environment, the sealing performance testing fixture is switched from the third environment to the first environment, that is, the sealing performance testing fixture is restored to the reference environment to facilitate subsequent environment switching.

[0090] In one possible design, after the sealing performance test fixture with the seal installed is placed in the fourth environment and maintained for a fourth set time, the method further includes: switching the sealing performance test fixture with the seal installed from the fourth environment to the first environment.

[0091] In this testing method, after testing in four different environments, the environment of the sealing performance testing fixture is switched to the first environment to facilitate subsequent cyclic testing or subsequent waterproofing testing.

[0092] In one possible design, the relative humidity of the first environment, the second environment, and the third environment are the same, and the relative humidity of the fourth environment is greater than that of the first environment.

[0093] In this testing method, the environment is controlled not only from the perspective of temperature but also from the perspective of relative humidity, so as to simulate the actual environmental changes that the seal is in during use more closely.

[0094] In one possible design, after the tooling is installed and before the waterproofing test is performed, an environmental test is also included, which includes a high temperature and high humidity test. The high temperature and high humidity test includes placing the sealing performance test tooling with the seal installed in a fifth environment for a fifth set time. The temperature of the fifth environment is 83°C to 87°C and the relative humidity of the fifth environment is 83% to 87%.

[0095] In this testing method, the seal is first subjected to a high temperature and high humidity test, and then a waterproof test is performed. This method can be used to test and evaluate the waterproof performance of the seal after it has been subjected to extremely harsh environments.

[0096] In one possible design, the temperature of the fifth environment is 85°C and the relative humidity of the fifth environment is 85%.

[0097] In this testing method, extreme conditions are simulated in the high temperature and high humidity test, thereby simulating the environmental impact that the seal may encounter during long-term use, and thus predicting the sealing performance of the seal when applied between the vehicle body and the chassis.

[0098] In one possible design, the fifth time setting is equal to or greater than 480 hours.

[0099] In this testing method, the high temperature and humidity test takes a relatively long time, which can be used to evaluate the waterproof performance of the seal after long-term use in harsh environments.

[0100] In one possible design, the fifth time setting is 720 hours.

[0101] In this testing method, the high temperature and humidity test is conducted for a longer period of time, making the environmental test more stringent, thereby enabling the seals that pass the evaluation to have better durability.

[0102] In one possible design, after the tooling is installed and before the waterproofing test is performed, an environmental test is also included, which includes a salt spray test. The salt spray test includes placing the sealing performance test tooling with the seal installed in a sixth environment for a sixth set time, the sixth environment being an environment with neutral salt spray.

[0103] In this testing method, the seal is first subjected to a salt spray test, and then a waterproof test is performed, which can detect and evaluate the waterproof performance of the seal after it has been exposed to a salt spray environment.

[0104] In one possible design, the sixth setting time is equal to or greater than 480 hours.

[0105] In this testing method, the salt spray test takes a relatively long time, which can be used to evaluate the waterproof performance of the seal after long-term use in a salt spray environment.

[0106] In one possible design, the sixth time setting is 720 hours.

[0107] In this testing method, the longer duration makes the salt spray environment more severe, thus enabling seals that pass the evaluation to have better durability.

[0108] In one possible design, after the tooling is installed and before the waterproofing test is performed, the method also includes environmental testing, which includes high and low temperature cycling test, high temperature and high humidity test and salt spray test performed in sequence, or high temperature and high humidity test, high and low temperature cycling test and salt spray test performed in sequence.

[0109] The high and low temperature cycling test includes ten high and low temperature cycles, which include:

[0110] The sealing performance testing fixture with the seal installed is placed in a first environment and kept for a first set time;

[0111] Switch the sealing performance testing fixture with the seal installed to the second environment and maintain it in the second environment for the second set time;

[0112] Switch the sealing performance testing fixture with the seal installed to the first environment and maintain it in the first environment for the seventh preset time;

[0113] Switch the sealing performance testing fixture with the seal installed to the third environment and maintain it in the third environment for the third set time;

[0114] Switch the sealing performance testing fixture with the seal installed to the first environment and maintain it in the first environment for the seventh set time;

[0115] Switch the sealing performance testing fixture with the seal installed to the fourth environment and maintain it in the fourth environment for the fourth set time;

[0116] Switch the sealing performance testing fixture with the seals installed to the first environment;

[0117] The high temperature and high humidity test includes: placing the sealing performance test fixture with the sealing element installed in the fifth environment and maintaining it in the fifth set environment for a fifth time. The temperature of the fifth environment is 85℃ and the relative humidity of the fifth environment is 85%.

[0118] The salt spray test includes placing a sealing performance testing fixture with a seal installed in a sixth environment for a sixth set time. The sixth environment is an environment with neutral salt spray.

[0119] In this testing method, the sealing performance testing fixture is first subjected to high and low temperature cycling tests, high temperature and high humidity tests, and salt spray tests, and then a waterproof test is conducted. The high and low temperature cycling tests, high temperature and high humidity tests, and salt spray tests simulate the state of the seal under different environmental conditions, including the state after being subjected to harsh environments, which is closer to the state of the seal in actual use. Therefore, test results that are closer to actual applications can be obtained, which is beneficial to verifying the waterproof performance of the seal when it is actually applied between the vehicle body and the chassis.

[0120] In one possible design, a third pad assembly is installed between the first and second housings during tooling installation.

[0121] In this test method, because a third pad assembly is installed between the first and second housings, the height of the first gap is relatively large, and the seal is in an under-pressure state, that is, the seal is in a relatively mild compression state. Since the under-pressure state is more likely to have weaker waterproof performance than the positive pressure state and the over-pressure state, if the seal in the under-pressure state also meets the waterproof standard, the seals in the positive pressure state and the over-pressure state can also be presumed to meet the same waterproof standard, thereby simplifying the test process and improving the test efficiency.

[0122] In one possible design, the temperature of the first environment is 23°C, the relative humidity of the first environment is 50%, and the first set time is 1 hour;

[0123] The temperature of the second environment is 90℃, the relative humidity of the second environment is 50%, and the second set time is 4 hours;

[0124] The temperature of the third environment is -40℃, the relative humidity of the third environment is 50%, and the third set time is 4 hours;

[0125] The temperature of the fourth environment is 50℃, the relative humidity of the fourth environment is 95%, and the fourth setting time is 13h;

[0126] The fifth environment has a temperature of 85℃, a relative humidity of 85%, and a set time of 720h.

[0127] The sixth setting is 720 hours;

[0128] The seventh setting is 1 hour.

[0129] In this testing method, the tooling is subjected to environmental tests in various environments with relatively large temperature differences. This simulates the environmental conditions that various vehicles are more likely to be in, and allows for a more realistic simulation of the seals between the vehicle chassis and body, thus obtaining more accurate evaluation data. Attached Figure Description

[0130] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or exemplary technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0131] Figure 1 is a schematic diagram of the sealing performance testing fixture provided in an embodiment of this application after the sealing element has been installed.

[0132] Figure 2 is a schematic diagram of the sealing performance testing fixture provided in one embodiment of this application after the sealing element has been installed;

[0133] Figure 3 is a cross-sectional view along line AA in Figure 2;

[0134] Figure 4 is an enlarged view of point B in Figure 3;

[0135] Figure 5 is a schematic diagram showing the relative positions of the first housing and the second housing in a sealing performance testing fixture provided in an embodiment of this application;

[0136] Figure 6 is a schematic diagram of the first housing in a sealing performance testing fixture provided in an embodiment of this application from one perspective.

[0137] Figure 7 is a schematic diagram of the first housing in a sealing performance testing fixture provided in an embodiment of this application from another perspective.

[0138] Figure 8 is a schematic diagram of the second housing in a sealing performance testing fixture provided in an embodiment of this application from one perspective.

[0139] Figure 9 is a schematic diagram of the second housing in a sealing performance testing fixture provided in an embodiment of this application from another perspective.

[0140] Figure 10 is a schematic diagram of the sealing performance testing fixture provided in an embodiment of this application after the sealing element has been installed.

[0141] Figure 11 is an enlarged view of point C in Figure 10;

[0142] Figure 12 is an exploded view of the parts of a sealing performance testing fixture provided in an embodiment of this application;

[0143] Figure 13 is a schematic diagram of the structure of the gasket in a sealing performance testing fixture provided in an embodiment of this application;

[0144] Figure 14 is a schematic diagram of the sealing performance testing fixture provided in an embodiment of this application after the sealing element has been installed.

[0145] Figure 15 is an enlarged view of point F in Figure 14;

[0146] Figure 16 is an enlarged view of point D in Figure 12;

[0147] Figure 17 is an enlarged view of point E in Figure 12;

[0148] Figure 18 is a schematic diagram of the setting position of the counterweight structure in a sealing performance testing fixture provided in an embodiment of this application;

[0149] Figure 19 is a structural schematic diagram of the second housing in a sealing performance testing fixture provided in an embodiment of this application from another perspective;

[0150] Figure 20 is a schematic diagram of the assembly process of the sealing performance testing fixture and the sealing element provided in an embodiment of this application;

[0151] Figure 21 is a schematic diagram of the structure of a test device provided in an embodiment of this application;

[0152] Figure 22 is a flowchart of a test method provided in an embodiment of this application;

[0153] Figure 23 is a flowchart of a test method provided in one embodiment of this application;

[0154] Figure 24 is a flowchart of a test method provided in one embodiment of this application.

[0155] The reference numerals in the above figures are detailed as follows: 1. Sealing performance testing fixture; 2. Seal; 3. Water tank; 4. Water; 10. First housing; 11. First surface; 12. First flange; 13. First assembly hole; 14. Limiting groove; 15. First recessed structure; 16. First opening; 20. Second shell; 21. Second surface; 22. Second flange; 23. Third assembly hole; 24. Third opening; 25. Air injection hole; 26. Second recessed structure; 30. Pad; 31. Spacer part; 32. Connecting part; 33. Second assembly hole; 34. Second opening; 40. Locking structure; 41. Bolt; 42. Nut; 50. First gap; 51. Straight area; 52. First slope area; 53. Second slope area; 54. Step area; 55. Rounded corner area; 60. Test chamber; 70. Counterweight structure; 111. Straight surface; 112. First slope; 113. Second slope; 114. Step surface; 115. Curved surface. Detailed Implementation

[0156] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0157] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two).

[0158] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0159] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the structure or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0160] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0161] In the accompanying drawings of this embodiment, dotted arrows point to the structure itself, solid triangular arrows point to the surface of the structure, and hollow triangular arrows point to an area, such as a hole, slot, opening, cavity, etc.

[0162] In vehicles, there exists a chassis design decoupled from the vehicle body. Because this type of chassis resembles a skateboard in shape, it is also called a skateboard chassis. This type of chassis is independent of the vehicle body, meaning the chassis and body are separate structures. The chassis and body are sealed together, typically using seals. In electric vehicles, the battery is usually installed between the chassis and the body; therefore, the quality of the seal between the chassis and the body affects vehicle safety, durability, and comfort. For example, sealing performance includes at least waterproofing and airtightness. Poor waterproofing between the chassis and the body will expose the battery to a relatively harsh environment for extended periods, affecting battery lifespan and impacting vehicle safety and durability. Poor airtightness between the chassis and the body will increase interior noise and vibration, affecting vehicle comfort.

[0163] However, since both the chassis and the body are large structures, and the assembly of the chassis, seals, and body is even larger and heavier, movement is difficult. Testing the sealing performance between the chassis and the body requires a large testing area and equipment, as well as a complex testing procedure. In summary, testing the sealing performance between the chassis and the body is characterized by high complexity, difficulty, and the need for a large testing space.

[0164] Based on this, this application provides a sealing performance testing fixture, including a first housing and a second housing. The first housing simulates a chassis, and the second housing simulates a vehicle body. A seal of the same type used for sealing the vehicle body and chassis is installed between the first and second housings, thus simulating the state of the seal being installed between the vehicle body and chassis. In this way, by performing sealing performance testing on the sealing performance testing fixture, the sealing performance of the vehicle body, chassis, and seal can be simulated. Since the first and second housings can be manufactured to relatively small sizes, the space required for sealing performance testing is reduced, and the process of moving the sealing performance testing fixture is simpler and more convenient, making sealing performance testing simpler and more convenient, reducing the difficulty of the test, and facilitating the evaluation of the sealing performance between the vehicle body and chassis.

[0165] The sealing performance testing fixture, testing device, and testing method provided in the embodiments of this application will be explained in detail below.

[0166] As shown in Figures 1 to 9, this application provides a sealing performance testing fixture 1. As shown in Figures 1 to 4, the sealing performance testing fixture 1 includes a first housing 10 and a second housing 20. The first housing 10 has a first surface 11; the second housing 20 has a second surface 21, which is disposed opposite to the first surface 11, and a first gap 50 is formed between the second surface 21 and the first surface 11. The first housing 10 and the second housing 20 are detachably connected, and a test cavity 60 is formed between the first housing 10 and the second housing 20, and the first gap 50 communicates with the test cavity 60.

[0167] The first housing 10 has a first surface 11, which simulates at least a portion of the connection surface in the chassis used for sealing connection with the vehicle body. The first surface 11 has at least a portion of the features of the surface in the chassis used for sealing connection with the vehicle body. Since the first surface 11 contains the same structural features as the chassis, it can simulate at least a portion of the connection surface in the chassis used for connection with the vehicle body. This allows the first housing 10 to simulate at least a portion of the chassis, while other structures of the first housing 10, except for the first surface 11, do not need to have the same structure as the chassis, thus greatly simplifying the structure of the first housing 10 compared to the chassis structure. Because the first housing 10 does not need to have the same dimensions as the chassis, it can be manufactured as a relatively small structure, thereby reducing the space occupied by the first housing 10 and reducing its weight.

[0168] The second housing 20 has a second surface 21, which simulates at least a portion of the connection surface in the vehicle body for sealing connection with the chassis. The second surface 21 has at least some features of the surface in the vehicle body for sealing connection with the chassis. Because the second housing 20 can simulate at least a portion of the vehicle body by incorporating at least some structural features identical to those in the vehicle body in the second surface 21, and because other structures of the second housing 20, except for the second surface 21, do not need to have the same structure as the vehicle body, the structure of the second housing 20 is significantly simplified compared to the vehicle body. Since the second housing 20 does not need to have the same dimensions as the vehicle body, it can be manufactured as a relatively small structure, thereby reducing the space occupied by the second housing 20 and reducing its weight.

[0169] The first housing 10 and the second housing 20 are detachably connected. Exemplarily, the first housing 10 and the second housing 20 can be detachably connected by any connection method such as plug-in, snap-fit, locking pin connection, bolt 41 connection, or caliper connection. After the first housing 10 and the second housing 20 are disassembled, it is convenient to install a sealing element 2 between them. The sealing element 2 is installed within the first gap 50, sealing the first gap 50, thus making the test chamber 60 communicating with the first gap 50 a closed chamber, facilitating subsequent sealing performance testing. The sealing element 2 is made of the same material as the sealing element between the vehicle body and the chassis, and has the same cross-sectional shape and dimensions. The sealing element 2 can be fixed to the first housing 10 and the second housing 20 in the same way as the sealing element between the vehicle body and the chassis. The sealing element 2 can be a sealing strip, sealant, putty, or other sealing structure. Exemplarily, a sealing strip is used as the sealing element between the vehicle body and the chassis. Since the sealing area between the vehicle body and the chassis is relatively large, a longer sealing strip is used. The sealing element 2 installed between the first housing 10 and the second housing 20 uses the same type of sealing strip, but the length of the sealing strip installed between the first housing 10 and the second housing 20 is relatively short. After the first housing 10 and the second housing 20 are connected, a first gap 50 is formed between the first housing 10 and the second housing 20, and the sealing element 2 is sealed and installed in this first gap 50. The opposite sides of the sealing element 2 contact the first surface 11 and the second surface 21, respectively.

[0170] A test cavity 60 is formed between the first housing 10 and the second housing 20. For example, a recessed structure can be provided on the side of the first housing 10 facing the second housing 20, and the second housing 20 can be a cover plate structure, covering the opening of the recessed structure, thereby forming the test cavity 60 between the first housing 10 and the second housing 20. Alternatively, a recessed structure can be provided on the side of the second housing 20 facing the first housing 10, and the first housing 10 can be a cover plate structure, covering the opening of the recessed structure, thereby forming the test cavity 60 between the first housing 10 and the second housing 20. In another embodiment, as shown in Figures 6 and 8, a first recessed structure 15 is provided on the side of the first housing 10 facing the second housing 20, and a second recessed structure 26 is provided on the side of the second housing 20 facing the first housing 10. When the first housing 10 and the second housing 20 are connected, the first recessed structure 15 and the second recessed structure 26 are connected, together forming the test cavity 60. The first gap 50 is connected to the test chamber 60. After the sealing element 2 is installed in the first gap 50, the sealing element 2 seals the test chamber 60 into a sealed chamber.

[0171] In this sealing performance testing fixture 1, the first housing 10 simulates at least a portion of the chassis, the second housing 20 simulates at least a portion of the vehicle body, the first surface 11 simulates at least a portion of the side of the chassis opposite to the vehicle body, the second surface 21 simulates at least a portion of the vehicle body opposite to the chassis, and the first gap 50 simulates at least a portion of the gap between the chassis and the vehicle body. Sealing performance testing can be performed using the sealing performance testing fixture 1, thereby simulating sealing performance testing in at least a portion of the area between the chassis and the vehicle body. The sealing performance test can be a waterproof test or an airtightness test. For example, during a waterproof test, a seal 2, used for installation between the sealing interface of the chassis and the vehicle body, is installed in the first gap 50. Thus, the sealing performance testing fixture 1 can simulate the state after the seal 2 is installed between the chassis and the vehicle body. For this sealing performance testing fixture 1, during a waterproof test, the presence of water in the test chamber 60 can determine whether the seal 2 has good waterproof performance between the first housing 10 and the second housing 20, thereby evaluating the sealing performance between the vehicle body and the chassis. The sealing performance testing fixture 1 can simulate the car body and chassis, thus eliminating the need to directly test the waterproofing of the car body and chassis, making the testing process more convenient and simple.

[0172] As shown in Figure 5, in some embodiments, the first gap 50 has a flat area 51, as shown in Figures 6 and 7, the area in the first surface 11 opposite to the flat area 51 is a flat surface 111, as shown in Figures 8 and 9, and the area in the second surface 21 opposite to the flat area 51 is a flat surface 111.

[0173] A flat plane 111 refers to a plane that is parallel to the horizontal plane and extends along a straight line in the horizontal plane.

[0174] The first gap 50 includes a flat area 51. In the flat area 51 of the first gap 50, both the first surface 11 and the second surface 21 are flat surfaces 111. In other words, the flat surfaces 111 in the first surface 11 and the flat surfaces 111 in the second surface 21 are arranged opposite to each other. The area of ​​the first gap 50 between the flat surfaces 111 in the first surface 11 and the flat surfaces 111 in the second surface 21 is the flat area 51. When the seal 2 is located in the flat area 51, the sealing state of the seal 2 when it is located in the flat area 51 between the vehicle body and the chassis can be simulated.

[0175] Since approximately 50%-70% of the relative area between the vehicle body and the chassis is a flat area 51, the first surface 11 and the second surface 21, which have flat surfaces 111, can be used to simulate at least 50%-70% of the relative area between the vehicle body and the chassis, thereby obtaining an evaluation result that is closer to the actual sealing performance between the vehicle body and the chassis.

[0176] As shown in Figures 5 to 9, in one possible design, the first gap 50 has a first slope area 52, and the areas of the first surface 11 and the second surface 21 that are opposite to the first slope 112 are both the first slope 112. The first slope 112 is inclined relative to the straight surface 111.

[0177] The first slope 112 can be an upward slope or a downward slope. The first slope 112 can extend along a curved path or along a straight path. The shape of the first slope 112 in the first surface 11 is adapted to the shape of the first slope 112 in the second surface 21 so that the distance between the first surface 11 and the second surface 21 in the first slope area 52 is equal. That is, the first gap 50 is an equally spaced gap in the first slope area 52, and the height of the first gap 50 is equal at all points in the first slope area 52.

[0178] In this configuration, the first sloping area 52 can simulate the non-planar area between the vehicle body and the chassis, such as a relative area with a slope, thereby evaluating the sealing performance between the vehicle body and the chassis with the sloping area.

[0179] As shown in Figures 5 to 9, in one possible design, the first gap 50 has a second slope area 53. The areas of the first surface 11 and the second surface 21 that are opposite to the second slope area 53 are both second slopes 113. The second slope 113 is inclined relative to the straight surface 111, and the inclination direction of the second slope 113 is opposite to that of the first slope 112.

[0180] The second slope 113 is inclined in the opposite direction to the first slope 112. That is to say, one of the first slope 112 and the second slope 113 is inclined upward, and the other is inclined downward. The inclination angle of the first slope 112 and the inclination angle of the second slope 113 may be the same or different.

[0181] In this configuration, the first slope area 52 and the second slope area 53 with different tilt directions can simulate the first slope area 52 and the second slope area 53 with different tilt directions between the vehicle body and the chassis, thereby evaluating the sealing performance between the vehicle body and the chassis with the first slope area 52 and the second slope area 53 with different tilt directions.

[0182] When the first gap 50 simultaneously has a planar area, a first sloping area 52, and a second sloping area 53, the first sloping area 52 and the second sloping area 53 can be connected to each other, or the first sloping area 52 and the second sloping area 53 can be spaced apart. For example, the first sloping area 52 and the second sloping area 53 are located on opposite sides of the planar area. The first gap 50 can be a closed ring, and the number of the first sloping area 52, the second sloping area 53, and the planar area can each be one or more.

[0183] In one possible design, the first gap 50 has a stepped area 54, and the area of ​​at least one of the first surface 11 and the second surface 21 opposite to the stepped area 54 is a stepped surface 114. The stepped surface 114 includes at least two platforms of different heights and a connecting surface connecting the two adjacent platforms. The two platforms may be parallel or non-parallel, and the connecting surface is inclined relative to the platforms. For example, two straight areas 51 are connected by a first sloping area 52 (or a second sloping area 53), then the two straight areas 51 and the first sloping area 52 (or the second sloping area 53) located between the two straight areas 51 can together form a stepped area 54.

[0184] In this configuration, the step area 54 can simulate the step area 54 between the vehicle body and the chassis, thereby evaluating the sealing performance between the vehicle body and the chassis with the step area 54.

[0185] As shown in Figures 6 and 8, in one possible design, the first gap 50 has a rounded corner area 55, and the areas on the first surface 11 and the second surface 21 opposite to the rounded corner area 55 are both arc surfaces 115.

[0186] The extension path of the arc surface 115 is arc-shaped, which can be either circular or non-circular. The arc surface 115 can be parallel to or not parallel to the horizontal plane. The rounded corner area 55 can be used to connect any two adjacent areas among the planar area, the first slope area 52, the second slope area 53, and the stepped area 54.

[0187] In this configuration, the rounded corner area 55 can simulate the rounded corner area 55 between the vehicle body and the chassis, thereby evaluating the sealing performance between the vehicle body and the chassis with the rounded corner area 55.

[0188] In one example, the first gap 50 includes two straight areas 51 and two stepped areas 54. The two straight areas 51 are arranged opposite each other, and the two stepped areas 54 are arranged opposite each other. The two straight areas 51 and the two stepped areas 54 are alternately arranged in the horizontal projection circumferential direction. One of the first slope area 52 and the second slope area 53 is arranged between adjacent straight areas 51 and stepped areas 54. The two sides of each straight area 51 are the first slope area 52 and the second slope area 53, respectively. The two sides of each stepped area 54 are the first slope area 52 and the second slope area 53, respectively. The straight areas 51 and the first slope area 52, the straight areas 51 and the second slope area 53, the stepped areas 54 and the first slope area 52, and the stepped areas 54 and the second slope area 53 are all connected by rounded corner areas 55. In this configuration, the installation area of ​​the seal 2 formed by the first gap 50 has both horizontal features (straight area 51) and non-horizontal features (first slope area 52, second slope area 53, arc area and step area 54), which can more closely resemble the features that may appear in the installation area between the vehicle body and the chassis for installing the seal 2. This makes the sealing performance testing fixture 1 more closely resemble the design features of the actual vehicle, and thus makes the sealing test results more consistent with the sealing performance of the actual vehicle.

[0189] In one possible design, as shown in Figures 10 and 11, the sealing performance test fixture 1 further includes a pad 30 having a spacer portion 31 located between the first surface 11 and the second surface 21. The spacer portion 31 is located on the side of the seal 2 away from the first gap 50 and is used to define the height of the first gap 50.

[0190] The pad 30 has a block structure. When the seal 2 is installed in the first gap 50, the pad 30 is located on the side of the seal 2 away from the test chamber 60. When the seal 2 is a closed annular structure, the seal 2 surrounds the test chamber 60, with the side closer to the test chamber 60 being the inner side of the seal 2 and the side away from the test chamber 60 being the outer side. The pad 30 is located on the outer side of the seal 2. The septum portion 31 is at least a portion of the pad 30 structure. The septum portion 31 is located between the first surface 11 and the second surface 21, and it contacts the first surface 11 and the second surface 21 respectively. The septum portion 31 is supported between the first surface 11 and the second surface 21, so that the distance between the first surface 11 and the second surface 21 is the height of the septum portion 31, which is the height of the first gap 50. By selecting a pad 30 with a septum portion 31 of a set height and installing it between the first housing 10 and the second housing 20, the height of the first gap 50 is maintained at the set height. With this setup, in practical applications, different pads 30 can be manufactured to match the height of the gap between the body and chassis of different vehicle models. By installing the corresponding pads 30 between the first housing 10 and the second housing 20, the first gap 50 of the sealing performance testing fixture 1 can be set to a predetermined distance, which is the predetermined gap between the body and chassis. Thus, the sealing performance of the sealing interface between the body and chassis of the vehicle can be evaluated by simulating a vehicle with this predetermined gap through the sealing performance testing fixture 1 and performing a sealing performance test on the sealing performance testing fixture 1.

[0191] In one possible design, as shown in Figure 12, the sealing performance test fixture 1 includes multiple pad assemblies. Each pad assembly includes at least one pad 30. The height of the spacer portion 31 of the pad 30 in the same pad assembly is the same. The height of the spacer portion 31 of the pad 30 in different pad assemblies is different. One of the pad assemblies is installed between the first surface 11 and the second surface 21.

[0192] During vehicle design, a predetermined gap exists between the vehicle body and chassis. During vehicle manufacturing, due to manufacturing and assembly errors, there is an allowable range of error for this gap, known as the tolerance fluctuation range. Therefore, the gap between the vehicle body and chassis is not a fixed value, but rather a value within the tolerance fluctuation range, and different vehicles may have different gaps. Since the sealing performance testing fixture 1 includes multiple pad assemblies, and the height of the spacer portion 31 of the pad 30 in different pad assemblies is different, the height of the first gap 50 can be varied by installing pads 30 with spacer portions 31 of different heights in the sealing performance testing fixture 1. This allows for sealing performance testing under different first gap 50 heights, simulating the sealing situation between the vehicle body and chassis under several gap heights within the tolerance fluctuation range. In other words, multiple pad assemblies can simulate the state of the seal 2 when the first gap 50 is at different heights, thus enabling the testing of the sealing performance of the seal 2 under various compression states.

[0193] In one specific embodiment, as shown in FIG12, there are eight pads 30 shown in FIG12. The height of the spacer portion 31 of these eight pads 30 is the same, and these eight pads 30 belong to the same plot component.

[0194] In one possible design, there are three spacer assemblies: a first spacer assembly, a second spacer assembly, and a third spacer assembly. The height of the spacer portion 31 in the first spacer assembly is H1, the height of the spacer portion 31 in the second spacer assembly is H2, and the height of the spacer portion 31 in the third spacer assembly is H3. The preset value of the height of the first gap 50 is L, and the tolerance fluctuation range of the height dimension of the first gap 50 is ±S. Then, H1 = L, H2 = LS, and H3 = L + S.

[0195] In this configuration, the height of the shim portion 31 in the first shim assembly is equal to the design value of the gap between the vehicle body and the chassis. Therefore, the first gap 50 in the sealing performance testing fixture 1 with the first shim assembly is the design value (or nominal value), and this compression state of the seal 2 is called the positive pressure state. The height of the shim portion 31 in the second shim assembly is the smallest, and the first gap 50 in the sealing performance testing fixture 1 with the second shim assembly is at the minimum height within the allowable error range. Because the height of the first gap 50 is the smallest, the compression of the seal 2 within the first gap 50 is the largest, and the state when the seal 2 is in this state of maximum compression is called the overpressure state. The height of the shim portion 31 in the third shim assembly is the largest, and the first gap 50 in the sealing performance testing fixture 1 with the third shim assembly is at the maximum height within the allowable error range. Because the height of the first gap 50 is the largest, the compression of the seal 2 installed within the first gap 50 is the lowest, and the state when the seal 2 is in this state is called the underpressure state.

[0196] In this configuration, the sealing performance testing fixture 1 can simulate the sealing performance between the vehicle body and chassis when the first gap 50 is at its design value by installing the first pad assembly. The sealing performance testing fixture 1 can simulate the sealing performance between the vehicle body and chassis when the seal 2 is under-pressured by installing the second pad assembly. The sealing performance testing fixture 1 can simulate the sealing performance between the vehicle body and chassis when the seal 2 is under-pressured by installing the third pad assembly. Since the third pad assembly and the second pad assembly can respectively simulate the state when the first gap 50 is at the endpoint of the tolerance fluctuation range, if the seal 2 has good sealing performance in both over-pressured and under-pressured states, then the seal 2 can have good sealing performance within the tolerance fluctuation range.

[0197] In some possible designs, as shown in Figure 12, the pad assembly includes multiple pads 30, which are circumferentially spaced within the first gap 50. The multiple pads 30 can be block structures of different shapes. The opposite sides of each pad 30 are respectively shaped to mimic the first surface 11 and the second surface 21 corresponding to the mounting area of ​​that pad 30, so that the opposite sides of the pad 30 can have a larger contact area with the first surface 11 and the second surface 21, and a larger fitting area. For example, the opposite sides of the pad 30 installed in the flat area 51 are both flat surfaces 111, the opposite sides of the pad 30 installed in the first slope area 52 are both sloped surfaces, and the opposite sides of the pad 30 installed in the rounded corner area 55 are both curved surfaces 115.

[0198] In this configuration, the spaced arrangement of multiple pads 30 saves on the total manufacturing cost of the pads 30, and the spaced arrangement of the multiple pads 30 can support the first housing 10 and the second housing 20 in different areas, so as to make the first housing 10 and the second housing 20 relatively stable connected.

[0199] In some other possible configurations, a pad assembly may also include a pad 30, which has a ring-shaped structure. The opposite sides of the pad 30 are respectively shaped to the first surface 11 and the second surface 21. The width of the pad 30 is smaller than the width of the first surface 11 and smaller than the width of the second surface 21. The area between the first surface 11 and the second surface 21 where the pad 30 is not provided is the first gap 50. The pad 30 is located in the outer region of the first gap 50.

[0200] In one possible design, as shown in FIG13, the pad 30 includes a connecting portion 32 connected to the spacer portion 31. As shown in FIG6 and FIG7, the first housing 10 is provided with a limiting groove 14. As shown in FIG11, the connecting portion 32 is at least partially located within the limiting groove 14.

[0201] In the spacer block 30, the connecting part 32 and the spacer part 31 can be separately provided and fixedly connected. The connecting part 32 and the spacer part 31 can be fixedly connected by any connection method such as adhesive bonding, welding, or bolt connection. The connecting part 32 and the spacer part 31 can also be connected into an integral structure and manufactured by an integral molding process.

[0202] In the first housing 10, there can be one or more limiting grooves 14. For example, as shown in Figures 5 and 6, there is one limiting groove 14, which is annular and located in the outer region of the first gap 50. One or more pads 30 can be provided. When there is only one pad 30, its connecting portion 32 extends into a portion of the limiting groove 14. When there are multiple pads 30, each pad 30 extends into different regions of the annular limiting groove 14. The limiting grooves 14 limit the pads 30, facilitating their installation (the pad 30 is in place when its connecting portion 32 abuts against the limiting groove 14) and also allowing space to be reserved in the first gap 50.

[0203] In some feasible implementations, the pad 30 may be mounted on one of the first housing 10 or the second housing 20, and then the first housing 10 and the second housing 20 are connected to connect the pad 30, the first housing 10 and the second housing 20.

[0204] As shown in Figures 12 and 14, in one possible design, the first housing 10, the second housing 20, and the pad 30 are connected by a locking structure 40. The locking structure 40 is used to connect the first housing 10, the second housing 20, and the pad 30, and the locking structure 40 can be a clamping structure, a bolt structure, etc.

[0205] In this configuration, the first housing 10, the second housing 20, and the pad 30 are connected by a locking structure 40, thereby eliminating the need to install a connection structure on the first housing 10 or the second housing 20, simplifying the structure of the first housing 10 and the second housing 20.

[0206] As shown in Figures 14 and 15, in one possible design, the first housing 10 has a first flange 12, the second housing 20 has a second flange 22, the first surface 11 is located on the side of the first flange 12 facing the second flange 22, and the second surface 21 is located on the side of the second flange 22 facing the first flange 12.

[0207] The first flange 12 is located on the outer edge region of the first housing 10 and extends away from the test cavity 60. The first flange 12 has a ring structure and is located at the end of the first housing 10 near the second housing 20. The second flange 22 is located on the outer edge region of the second housing 20 and extends away from the test cavity 60. The second flange 22 has a ring structure and is located at the end of the second housing 20 near the first housing 10.

[0208] In this configuration, a test cavity 60 is not required between the first flange 12 and the second flange 22, thus allowing the height of the first flange 12 and the second flange 22 to be set smaller. The pad 30 is placed between the first flange 12 and the second flange 22. In this way, the first housing 10, the second housing 20, and the pad 30 can be connected by connecting the first flange 12, the second flange 22, and the pad 30. Since the total height of the first flange 12, the second flange 22, and the pad 30 is relatively small, a relatively small locking structure 40 can be used to connect the first flange 12, the second flange 22, and the pad 30, thereby facilitating the connection of the locking structure 40.

[0209] When the locking structure 40 adopts a clamping structure, the clamping structure can be a C-type clamp (not shown in the figure). The C-type clamp has two clamping parts, which are located on the side of the first housing 10 away from the pad 30 and the side of the second housing 20 away from the pad 30, respectively. The C-type clamp clamps the first housing 10 and the second housing 20, and the pad 30 is located between the first housing 10 and the second housing 20. Thus, the first housing 10, the second housing 20 and the pad 30 can be clamped together by the C-type clamp to fix the first housing 10, the second housing 20 and the pad 30. When multiple pads 30 are provided in the sealing performance testing fixture 1, a C-type clamp can be provided for each pad 30.

[0210] When the locking structure 40 adopts a bolt structure, the bolt structure includes a bolt 41, and holes for the bolt 41 to pass through can be provided on the first housing 10, the second housing 20, and the pad 30, respectively. Threaded holes can be provided on the first housing 10 or the second housing 20, and the connection is achieved by the engagement of the bolt 41 with the threaded holes. Alternatively, the bolt 41 structure may also include a nut 42, which locks the first housing 10, the second housing 20, and the pad 30 after the bolt 41 passes through the holes on the first housing 10, the pad 30, and the second housing 20.

[0211] In some embodiments, as shown in FIG15, the first flange 12 is provided with a first mounting hole 13, the pad block 30 is provided with a second mounting hole 33, and the second flange 22 is provided with a third mounting hole 23. The first mounting hole 13, the second mounting hole 33 and the third mounting hole 23 are interconnected, and the locking structure 40 is sequentially inserted through the first mounting hole 13, the second mounting hole 33 and the third mounting hole 23.

[0212] The locking structure 40 may include a bolt 41 or a threaded rod, and may also include a nut 42. In one possible configuration, one of the first mounting hole 13 and the third mounting hole 23 is a threaded hole. Taking the first mounting hole 13 as an example, the locking structure 40 includes a bolt 41. The head of the bolt 41 is located on the side of the third mounting hole 23 away from the first flange 12. The shank of the bolt 41 passes through the third mounting hole 23 and the second mounting hole 33 in sequence, and is screwed into the first mounting hole 13. The bolt 41 is locked in the first mounting hole 13, so that one end of the bolt 41 is connected to the first flange 12, and the other end abuts against the second flange 22 through its head, thereby connecting the second flange 22 and the first flange 12. Since the pad 30 is located between the first flange 12 and the second flange 22, the first flange 12, the second flange 22 and the pad 30 are connected by the engagement of the bolt 41 with the threaded hole, that is, the first housing 10, the second housing 20 and the pad 30 are connected. In another scenario, the first mounting hole 13, the second mounting hole 33, and the third mounting hole 23 are all smooth holes. When the locking structure 40 includes a bolt 41 and a nut 42, as shown in Figure 15, one end of the bolt 41 can pass through the first mounting hole 13, the second mounting hole 33, and the third mounting hole 23 in sequence, then extend and lock with the nut 42. The head of the bolt 41 and the nut 42 clamp the first flange 12 and the second flange 22 from the outside, respectively, thereby connecting the first flange 12, the second flange 22, and the pad 30. Alternatively, one end of the bolt 41 can pass through the third mounting hole 23, the second mounting hole 33, and the first mounting hole 13 in sequence, then extend and lock with the nut 42. The head of the bolt 41 and the nut 42 clamp the second flange 22 and the first flange 12 from the outside, respectively, thereby connecting the first flange 12, the second flange 22, and the pad 30. When the locking structure 40 includes a screw and nuts 42, both ends of the screw are threaded, and one screw corresponds to two nuts 42. The screw passes through the first mounting hole 13, the second mounting hole 33, and the third mounting hole 23. The two ends of the screw extend from the first mounting hole 13 and the third mounting hole 23 respectively and lock with the corresponding nuts 42. The two nuts 42 clamp the first flange 12 and the second flange 22 from the outside of the first flange 12 and the second flange 22 respectively, thereby connecting the first flange 12, the second flange 22, and the pad 30. In this configuration, the locking structure 40 fixes the first flange 12, the pad 30, and the second flange 22 by passing through the first mounting hole 13, the second mounting hole 33, and the third mounting hole 23, making the fixing method simple and convenient.

[0213] In one possible design, as shown in Figures 13, 16 and 17, the first mounting hole 13 has a first opening 16, the second mounting hole 33 has a second opening 34, and the third mounting hole 23 has a third opening 24. The first opening 16 is located on the edge region of the first flange 12 away from the test cavity 60. The second opening 34 and the third opening 24 are both connected to the first opening 16, and the second opening 34 and the third opening 24 are both oriented in the same direction as the first opening 16.

[0214] The first assembly hole 13 penetrates the first housing 10 along the height direction of the sealing performance testing fixture 1, and the side of the first assembly hole 13 has a first opening 16. The first opening 16 is located on the side of the first assembly hole 13 away from the test chamber 60. The first opening 16 makes the first assembly hole 13 a U-shaped hole, and the side of the first assembly hole 13 is connected to the outside. The second assembly hole 33 penetrates the pad 30 along the height direction of the sealing performance testing fixture 1. The second opening 34 makes the second assembly hole 33 a U-shaped hole, and the side of the second assembly hole 33 is connected to the outside. The third assembly hole 23 penetrates the second housing 20 along the height direction of the sealing performance testing fixture 1. The third opening 24 makes the third assembly hole 23 a U-shaped hole, and the side of the third assembly hole 23 is connected to the outside. The widths of the first opening 16, the second opening 34, and the third opening 24 are all greater than or equal to the outer diameter of the area of ​​the locking structure 40 that extends into the first mounting hole 13, the second mounting hole 33, and the third mounting hole 23. Exemplarily, the widths of the first opening 16, the second opening 34, and the third opening 24 are all greater than or equal to the outer diameter of the shank of the bolt 41. In this configuration, the bolt 41 and the nut 42 do not need to be completely separated; the nut 42 can be screwed onto one end of the bolt 41. The distance between the head of nut 42 and bolt 41 is greater than the total height of the first flange 12, second flange 22, and pad 30. Bolt 41 is pushed from the first opening 16, second opening 34, and third opening 24 towards the test chamber 60, allowing it to enter the first mounting hole 13, second mounting hole 33, and third mounting hole 23. Then, nut 42 is tightened to bring the head of nut 42 closer to bolt 41, clamping the first flange 12, second flange 22, and pad 30. During disassembly, nut 42 is loosened without completely removing it from bolt 41, allowing the locking structure 40 to be removed entirely from the first opening 16, second opening 34, and third opening 24. In this configuration, the locking structure 40 can be pushed from the first opening 16, second opening 34, and third opening 24 into the first mounting hole 13, second mounting hole 33, and third mounting hole 23, enabling rapid disassembly and installation of the locking structure 40.

[0215] When using the sealing performance testing fixture 1 for waterproof testing, it is necessary to observe whether water has entered the test chamber 60 after the waterproof test. In some feasible embodiments, the test chamber 60 can be opened and the presence of water droplets inside can be determined manually. In other feasible embodiments, a test patch can be used to assist in determining whether water has entered the test chamber 60.

[0216] In one possible design, a test patch that changes color when exposed to water is placed inside the test chamber 60.

[0217] The test strips can be water-sensitive test strips, such as anhydrous copper sulfate test strips and anhydrous cobalt chloride test strips. Anhydrous copper sulfate test strips are originally white, but turn blue when they come into contact with water. Anhydrous cobalt chloride test strips are originally dark blue, but turn pink when they come into contact with water.

[0218] In this setup, since the test patch changes color when it comes into contact with water, it is possible to quickly and intuitively determine whether water has entered the test chamber 60, which is beneficial for waterproof performance evaluation.

[0219] The test patch can be applied to the inner wall of the test chamber 60. The test patch can be applied to the first housing 10 or the second housing 20. The inner wall of the first housing 10 or the second housing 20 can be completely covered with test patches, or a ring of test patches can be applied at a distance equal to that of the first gap 50.

[0220] In one possible design, test patches are provided at both a first distance and a second distance from the first gap 50 inside the test cavity 60, with the first distance being smaller than the second distance.

[0221] In this configuration, multiple test stickers are spaced apart from the first gap 50 within the test chamber 60, from near to far. This configuration allows for further analysis of the amount of water entering the test chamber 60. Since water is more likely to enter the test chamber 60 via the first gap 50, if the amount of water is small, the test sticker at the first distance will change color, while the test sticker at the second distance will not change color. If the amount of water is larger, the water will flow past the test sticker at the first distance and then to the test sticker at the second distance, causing both the test stickers at the first and second distances to change color.

[0222] In this setup, the water inlet distance within the test chamber 60 can be easily determined by observing whether the test patch at the first distance changes color and whether the patch at the second distance changes color.

[0223] During the waterproofing test using the sealing performance testing fixture 1, the fixture 1 needs to be placed at a certain depth underwater and maintained at that depth for a certain period of time. In some cases, the fixture 1 can be made relatively heavy, allowing it to sink to a predetermined underwater position. Alternatively, as shown in Figure 18, in one possible design, the sealing performance testing fixture 1 includes a counterweight structure 70, which is disposed within the test chamber 60. In this configuration, the addition of the counterweight structure 70 helps to maintain the sealing performance testing fixture 1 at the predetermined underwater position, and the counterweight structure 70 facilitates the waterproofing test. Due to the separate design of the counterweight structure 70 from the first housing 10 and the second housing 20, the weight of the first housing 10 and the second housing 20 is relatively light, which facilitates production, processing and transportation. Furthermore, different weights of counterweight structures 70 can be placed in the test chamber 60 according to the test requirements, so that the sealing performance test fixture 1 can be submerged to different depths in the water to meet the waterproof test requirements.

[0224] The sealing performance testing fixture 1 can also be used to perform airtightness testing. As shown in Figure 19, in one possible design, at least one of the first housing 10 and the second housing 20 is provided with an injection port 25 and a sealing structure (not shown in the figure). The injection port 25 is connected to the test chamber 60, and the sealing structure is detachably connected to the injection port 25 and can be adapted to seal the injection port 25.

[0225] The sealing structure is detachably connected to the vent 25. Exemplarily, the sealing structure can be a plug made of a material with a certain elasticity, such as rubber or silicone. At least a portion of the plug extends into the vent 25 and is press-fitted to it. Alternatively, the sealing structure can be tape, which is adhered to the inner or outer side of the second housing 20, covering the vent 25 and thus sealing it. In this configuration, the vent 25 can be used to inflate the test chamber 60, thereby testing the airtightness of the sealing interface between the vehicle body and the chassis. After covering the vent 25 with the sealing structure, the sealing performance testing fixture 1 can be used to test waterproof performance. That is, this sealing performance testing fixture 1 is convenient for both airtightness and waterproof testing, and has a wider range of applications. In one specific embodiment, as shown in FIG19, the second housing 20 is provided with a vent 25 and a sealing structure, with the sealing structure covering the vent 25.

[0226] In one specific embodiment, the sealing performance testing fixture 1 includes a first housing 10, a second housing 20, a pad 30, and a locking structure 40. The first housing 10 is used to simulate a chassis and has a first flange 12 and a first recessed structure 15. The first flange 12 is located around the first recessed structure 15 and has a first surface 11. The edge of the first flange 12 is provided with a limiting groove 14, which is an annular structure. The second housing 20 is used to simulate a vehicle body and has a second flange 22 and a second recessed structure 26. The second flange 22 is located around the second recessed structure 26 and has a second surface 21. The first surface 11 and the second surface 21 are opposite to each other, and a first gap 50 is formed between the second surface 21 and the first surface 11. The first gap 50 is used to install the seal 2. The first recessed structure 15 and the second recessed structure 26 communicate to form a test cavity 60. A first gap 50 surrounds the test cavity 60. After a sealing element 2 is installed in the first gap 50, the sealing element 2 can seal the first gap 50, so that the test cavity 60 is called a sealed cavity. An air injection hole 25 may be provided on the second housing 20, and a sealing structure is provided at the air injection hole 25. The first gap 50 includes two straight areas 51 and two stepped areas 54. The two straight areas 51 are arranged opposite each other, and the two stepped areas 54 are arranged opposite each other. The two straight areas 51 and the two stepped areas 54 are alternately arranged in the horizontal projection circumferential direction. One of the first slope area 52 and the second slope area 53 is arranged between adjacent straight areas 51 and stepped areas 54. The two sides of each straight area 51 are the first slope area 52 and the second slope area 53, respectively. The two sides of each stepped area 54 are the first slope area 52 and the second slope area 53, respectively. The straight areas 51 and the first slope area 52, the straight areas 51 and the second slope area 53, the stepped areas 54 and the first slope area 52, and the stepped areas 54 and the second slope area 53 are all connected by rounded corner areas 55. The first surface 11 has two straight surfaces 111 and two stepped surfaces 114. The two straight surfaces 111 are arranged opposite each other, and the two stepped surfaces 114 are arranged opposite each other. The two straight surfaces 111 and the two stepped surfaces 114 are alternately arranged in the circumferential direction of the horizontal projection. One of the first slope 112 and the second slope 113 is provided between adjacent straight surfaces 111 and stepped surfaces 114. The two sides of each straight surface 111 are the first slope 112 and the second slope 113, respectively. The straight surfaces 111 and the first slope 112, the straight surfaces 111 and the second slope 113, the stepped surfaces 114 and the first slope 112, and the stepped surfaces 114 and the second slope 113 are all connected by arc surfaces 115.In the second surface 21, a straight surface 111 is provided corresponding to the straight surface 111 and the stepped surface 114 of the first surface 11, a first slope 112 is provided corresponding to the first slope 112 of the first surface 11, a second slope 113 is provided corresponding to the second slope 113 of the first surface 11, and an arc surface 115 is provided corresponding to the arc surface 115 of the first surface 11. The sealing performance testing fixture 1 includes multiple pads 30, which are divided into three groups according to their thickness. Each group of pads 30 is called a pad assembly. The three pad assemblies are called the first pad assembly, the second pad assembly, and the third pad assembly, respectively. The height of the spacer portion 31 in the first pad assembly is H1, the height of the spacer portion 31 in the second pad assembly is H2, and the height of the spacer portion 31 in the third pad assembly is H3. The preset value of the first gap 50 is L, and the tolerance fluctuation range of the first gap 50 is ±S. Then, H1 = L, H2 = LS, and H3 = L + S. The pad 30 includes an integrally formed connecting part 32 and a spacer part 31. The spacer part 31 is located in the first gap 50, and the connecting part 32 extends into the limiting groove 14. The first flange 12 is provided with a first mounting hole 13, the pad 30 is provided with a second mounting hole 33, and the second flange 22 is provided with a third mounting hole 23. The first mounting hole 13, the second mounting hole 33, and the third mounting hole 23 are interconnected. The locking structure 40 includes a bolt 41 and a nut 42. The bolt 41 passes through the first mounting hole 13, the second mounting hole 33, and the third mounting hole 23 in sequence and is then locked with the nut 42. A counterweight structure 70 may also be installed in the test chamber 60.

[0227] As shown in Figure 20, the assembly process of the sealing performance test fixture 1 and the sealing element 2 can be as follows: prepare the first housing 10, install the sealing element 2 on the first surface 11 of the first housing 10, place the pad 30 on the first housing 10, and extend the connecting part 32 of the pad 30 into the limiting groove 14 of the first housing 10. Place the counterweight structure 70 in the first housing 10, fasten the second housing 20 to the first housing 10, and connect the second housing 20, the first housing 10 and the pad 30 through the locking structure 40.

[0228] As shown in Figure 21, this application embodiment also provides a testing device, including a water tank 3 and a sealing performance testing fixture 1 provided in any of the above embodiments, wherein the water tank 3 is used to contain the sealing performance testing fixture 1.

[0229] The testing apparatus is used to conduct waterproof tests. Water tank 3 is a container for holding liquids; exemplarily, water tank 3 can be used to hold water 4. Sealing performance testing fixture 1 is used to simulate the vehicle body and chassis. Waterproof testing of the vehicle body and chassis can be simulated by using sealing performance testing fixture 1 within water tank 3, thereby enabling the evaluation of the waterproof performance between the vehicle body and chassis.

[0230] In one possible design, the water tank 3 is detachably connected to the sealing performance testing fixture 1.

[0231] For example, a chain is installed in the water tank 3, and a retaining ring is installed in either the first housing 10 or the second housing 20. Connecting the chain to the retaining ring connects the water tank 3 to the sealing performance testing fixture 1. Alternatively, in another example, a hook is installed in either the first housing 10 or the second housing 20, and a groove is provided on the side wall of the water tank 3, so that the hook is engaged in the groove to connect the sealing performance testing fixture 1 to the water tank 3.

[0232] In this configuration, the sealing performance testing fixture 1 is detachably connected to the water tank 3, which helps to keep the sealing performance testing fixture 1 in the set position inside the water tank 3, facilitating the waterproofing test.

[0233] As shown in Figures 20, 21, and 22, this application embodiment also provides a testing method using the sealing performance testing fixture 1 provided by any of the above technical solutions. The method includes fixture installation and waterproof testing, wherein:

[0234] The tooling installation includes: fixing the sealing element 2 to the first gap 50 of the sealing performance testing tooling 1, and sealing the test chamber 60 into a sealed chamber through the sealing element 2;

[0235] The waterproof test includes: placing the sealing performance test fixture 1 with the seal 2 installed in the water, so that the sealing performance test fixture 1 with the seal 2 installed is submerged at a first depth; after a first set time, removing the sealing performance test fixture 1 and checking whether water has entered the test chamber 60.

[0236] During the tooling installation process, the sealing element 2 can be fixed to the first housing 10 or the second housing 20 by adhesive or snap-fit ​​connection. Then, the first housing 10 and the second housing 20 are connected, thereby fixing the sealing element 2 in the first gap 50. When the sealing element 2 is a structure with certain elastic deformation characteristics, such as a sealing strip, the sealing element 2 can be compressed between the first surface 11 and the second surface 21, so that the sealing element 2 seals the first gap 50, and the test chamber 60 is sealed as a sealed chamber by the sealing element 2.

[0237] For example, the seal 2 is attached to the first housing 10, and then the second housing 20 is fastened to the first housing 10, connecting the second housing 20 to the first housing 10, so that a test cavity 60 is formed between the second housing 20 and the first housing 10, and the seal 2 seals the first gap 50, so that the test cavity 60 is called a sealed chamber.

[0238] A sealing performance testing fixture 1, equipped with seal 2, is placed in water to a certain depth, ensuring the water submerges at least 50 mm above the first gap, to test the waterproof performance of seal 2. Exemplarily, the first depth is greater than the height of the sealing performance testing fixture 1. In one feasible embodiment, the height of the sealing performance testing fixture 1 is less than 1 meter, the first depth is greater than or equal to 1 meter, and the first set time is greater than or equal to 30 minutes. In a specific example, an IPX7 waterproof test can be performed. IPX is a waterproof rating standard, and IPX7 is level 7 of this standard, indicating immersion resistance, meaning that even when immersed in water under specified conditions, water will not penetrate the interior. The IPX7 waterproof test requires placing the sample at a depth of at least 1 meter, with the top of the sample at least 0.15 meters below the water surface, and maintaining the test for 30 minutes. In the waterproof test provided in this application embodiment, the sealing performance test fixture 1 with the seal 2 installed can be placed underwater, such that the first depth is greater than or equal to 1 meter, the distance between the top surface of the sealing performance test fixture 1 with the seal 2 installed and the water surface is greater than or equal to 0.15 meters, and the first set time is greater than or equal to 30 minutes, so as to verify whether the seal 2 meets the IPX7 standard.

[0239] After removing the sealing performance testing fixture 1 from underwater, the surface of the fixture 1 with the seal 2 installed should be wiped dry, especially the water stains on the first gap 50 and the outer surface of the seal 2 exposed at the first gap 50, to prevent water from flowing into the test chamber 60 after the test is completed when the first housing 10 and the second housing 20 are opened. After the water is wiped dry, the first housing 10 and the second housing 20 are separated to observe whether water has entered the test chamber 60.

[0240] To facilitate observation of whether water has entered the test chamber 60, a water-sensitive color-changing test patch can be placed on the inner wall of the test chamber 60 (which can be the inner wall of the first housing 10 or the second housing 20) during the installation of the fixture. Since the chassis is located under the vehicle body during normal use, when the sealing performance test fixture 1 with the seal 2 installed is placed in water, the first housing 10 can be positioned below the second housing 20. Because water will flow downwards in the event of water ingress, the test patch can be attached to the inner wall of the first housing 10, and the test patch can be positioned below the first gap 50.

[0241] After conducting the waterproof test, the presence or absence of water in the test chamber 60 is determined by observing whether the test patch changes color. If no water enters the test chamber 60, the seal 2 meets the waterproof standard corresponding to the waterproof test, which means that the seal 2 between the vehicle body and chassis simulated by the sealing performance test fixture 1 meets the waterproof standard.

[0242] This testing method uses the first housing 10 of the sealing performance testing fixture 1 to simulate the chassis and the second housing 20 to simulate the vehicle body. The seal 2 is installed between the first housing 10 and the second housing 20, which simulates the state of the seal 2 being installed between the vehicle body and the chassis. Thus, the sealing performance testing fixture 1 with the seal 2 installed can simulate the state of the seal 2 being installed between the vehicle body and the chassis. By performing a waterproof test on the sealing performance testing fixture 1 with the seal 2 installed, the waterproof test of the vehicle body, chassis and seal 2 can be simulated, thereby realizing the evaluation of the waterproof performance of the seal 2 between the vehicle body and the chassis.

[0243] In some embodiments, as shown in FIG20, the tooling installation further includes:

[0244] A pad 30 is installed between the first housing 10 and the second housing 20, and the pad 30, the first housing 10 and the second housing 20 are connected.

[0245] The tooling installation process may include: installing a seal 2 on the first housing 10, installing a pad 30 on the first housing 10, fastening the second housing 20 onto the first housing 10, and connecting the pad 30, the first housing 10, and the second housing 20.

[0246] In this test method, the height of the first gap 50 between the first housing 10 and the second housing 20 can be changed by the pad 30, thereby allowing the waterproof performance of the seal 2 under a certain set compression state to be evaluated.

[0247] In order to enable the sealing performance testing fixture 1 with the seal 2 installed to be submerged in the water 4 at a set depth, a counterweight structure 70 can be installed inside the sealing performance testing fixture 1 with the seal 2 installed. The counterweight structure 70 can be placed in the first housing 10 before the second housing 20 is fastened to the first housing 10. After the second housing 20 is fastened to the first housing 10, the counterweight structure 70 can be located in the test chamber 60.

[0248] In other embodiments, the sealing performance testing fixture 1 is equipped with a retaining ring, and a chain is installed inside the water tank 3. After the sealing performance testing fixture 1 with the sealing element 2 is placed into the water tank 3, the chain is connected to the retaining ring, thereby fixing the sealing performance testing fixture 1 with the sealing element 2 inside the water tank 3. This method can also fix it at a set position in the water tank 3 so that the sealing performance testing fixture 1 with the sealing element 2 can be submerged in the water 4 at a set depth.

[0249] The sealing performance testing fixture 1 may be equipped with both a counterweight structure 70 and a retaining ring, or the sealing performance testing fixture 1 may be equipped with either a counterweight structure 70 or a retaining ring.

[0250] In one possible design, waterproofing tests are conducted using a first pad assembly, a second pad assembly, and a third pad assembly, respectively. The height of the spacer portion 31 in the first pad assembly is H1, the height of the spacer portion 31 in the second pad assembly is H2, and the height of the spacer portion 31 in the third pad assembly is H3. The preset value of the first gap 50 is L, and the tolerance fluctuation range of the first gap 50 is ±S. Then, H1 = L, H2 = LS, and H3 = L + S. Waterproofing tests were conducted using a first, second, and third pad assembly. This means three sets of tests were performed to assess the sealing performance of a vehicle body and chassis. In the first set of tests, during tooling installation and waterproofing testing, the first pad assembly was installed in the sealing performance testing fixture 1. The height of the spacer portion 31 in the first pad assembly was equal to the design value of the gap between the vehicle body and chassis. Therefore, by conducting waterproofing tests using the sealing performance testing fixture 1 with the first pad assembly, the waterproofing performance of the sealing interface between the vehicle body and chassis under positive pressure could be determined. In the second set of tests, during tooling installation and waterproofing testing, the second pad assembly was installed in the sealing performance testing fixture 1. The first gap 50 in the sealing performance testing fixture 1 with the second pad assembly was within the minimum height allowed by error. Therefore, by conducting waterproofing tests using the sealing performance testing fixture 1 with the second pad assembly, the waterproofing performance of the sealing interface between the vehicle body and chassis under overpressure could be determined. During the tooling installation and waterproofing test in the third group of tests, a third pad assembly was installed in the sealing performance test fixture 1 during tooling installation. The first gap 50 in the sealing performance test fixture 1 with the third pad assembly was at the maximum height within the allowable error range. Therefore, by conducting the waterproofing test through the sealing performance test fixture 1 with the third pad assembly, it is possible to detect whether the waterproofing performance of the sealing interface between the vehicle body and the chassis meets the standard when the seal 2 is in a low-pressure state.

[0251] In this setup, three sets of tests are conducted by replacing different pad components to simulate different states of the seal 2 within the tolerance range, thereby enabling a more comprehensive evaluation of the waterproof performance of the seal 2.

[0252] As shown in Figures 23 and 24, in one possible design, after the tooling is installed and before the waterproofing test is conducted, the testing method also includes: conducting environmental testing.

[0253] Environmental testing involves placing the tooling in a specific environment to simulate the condition of the vehicle body and chassis after a certain period of use. This environment may include one or more characteristics such as temperature, relative humidity, air quality, and wind speed. The simulated environment can be a high-temperature, high-humidity environment (simulating summer), a low-temperature, low-humidity environment (simulating winter), a high-salt, high-humidity environment (simulating coastal areas), or an environment with strong winds and sandstorms. Following environmental testing, a waterproofing test is conducted to simulate the condition of the vehicle body and chassis after a period of use in this simulated environment, thereby evaluating the sealing performance of the vehicle body and chassis after use.

[0254] In one possible design, environmental testing includes high and low temperature cycling testing, which includes:

[0255] The sealing performance testing fixture 1 was placed in various environments with different temperatures and kept for a set time.

[0256] Since vehicles will experience all four seasons during their use, and temperatures typically vary throughout the year, vehicles will encounter a variety of different temperatures during operation. By placing the sealing performance testing fixture 1 in environments with different temperatures and maintaining them for a set time, the usage conditions of the vehicle body, chassis, and the seals 2 between them can be simulated after the vehicle has been exposed to various temperatures. This allows for the evaluation of the waterproof performance after the vehicle has been used for a period of time through subsequent waterproof testing.

[0257] In one possible design, the high and low temperature cycling test includes high and low temperature cycling, which includes:

[0258] The sealing performance test fixture with the seal 2 installed is placed in a high-temperature environment and kept at high temperature for a specified time.

[0259] The sealing performance test fixture with the seal 2 installed is placed in a low temperature environment and kept at a low temperature for a certain period of time.

[0260] The temperature in a high-temperature environment is higher than the temperature in a low-temperature environment.

[0261] A significant temperature difference exists between high-temperature and low-temperature environments, increasing the degree of environmental variation between them. For example, the high-temperature environment can be above 40°C, while the low-temperature environment can be below -10°C. The high-temperature environment can simulate a high-temperature environment in summer, while the low-temperature environment can simulate a low-temperature environment in winter. Alternatively, the high-temperature environment can be above 90°C, while the low-temperature environment can be below -40°C. This allows the high-temperature environment to simulate the highest possible temperature reached at the vehicle's hottest point, such as the highest ambient temperature in the area housing the battery, and the low-temperature environment to simulate the lowest possible temperature at the vehicle's coldest point in extreme winter conditions.

[0262] In this testing method, the test fixture is placed in high-temperature and low-temperature environments for a certain period of time to simulate the state of the seal after being in a relatively harsh environment for a period of time, so as to evaluate the waterproof performance of the seal after being used in a relatively harsh environment for a period of time.

[0263] In one possible design, the high and low temperature cycling test includes high and low temperature cycling, which includes:

[0264] The sealing performance test fixture 1, which is equipped with the seal 2, is placed in a first environment and kept for a first set time.

[0265] The sealing performance test fixture 1 with the seal 2 installed is placed in the second environment and kept for a second set time;

[0266] The sealing performance test fixture 1, which is equipped with the seal 2, is placed in a third environment and kept for a third set time.

[0267] The sealing performance test fixture 1 with the seal 2 installed is placed in the fourth environment and kept for the fourth set time;

[0268] The temperatures of the first, second, third, and fourth environments are different.

[0269] In this test, the sealing performance testing fixture 1 is placed in four different environments for a set time. These four environments have different temperatures; that is, the sealing performance testing fixture 1 is tested at least at four different temperatures. These four temperatures can be set according to the seasonal temperatures of the geographical location of the vehicle's largest user group or the vehicle's sales market. For example, the temperature of the first environment can be set to the average spring temperature of a certain geographical location (e.g., City W), the temperature of the second environment can be set to the average summer temperature of City W, the temperature of the third environment can be set to the average autumn temperature of City W, and the temperature of the fourth environment can be set to the average winter temperature of City W. Alternatively, other settings can be used. For example, the temperature of the first environment can be set to the normal temperature of City W (e.g., the normal temperature could be the temperature that occurs most frequently in City W throughout the year), the temperature of the second environment can be set to the maximum temperature that the chassis and body will experience during operation, the temperature of the third environment can be set to the minimum temperature of City W, and the temperature of the fourth environment can be set to the maximum temperature of City W.

[0270] In the above test method, the sealing performance test fixture 1 is placed in four different temperature environments for a certain period of time before the waterproof test is carried out. This can simulate the state of the seal 2 after use at different temperatures, so as to evaluate the waterproof performance of the seal 2 after use in four different temperature environments.

[0271] For example, in some embodiments, the temperature of the second environment is greater than the temperature of the first environment, the temperature of the third environment is less than the temperature of the first environment, and the temperature of the fourth environment is greater than the temperature of the first environment and less than the temperature of the second environment.

[0272] In this testing method, the temperature of the first environment is higher than that of the third environment, but lower than that of the second and fourth environments. Therefore, the first temperature can be set as the baseline temperature. The second environment has the highest temperature and can be used to simulate the environment of high-heat areas of the vehicle (such as areas where batteries are installed). The third environment has a low temperature and can be used to simulate winter environments. The fourth environment has a relatively high temperature and can be used to simulate summer environments. With this setup, four different environments can simulate various conditions that a vehicle may experience during use, thus allowing the waterproofing test to be used to evaluate the waterproofing performance of the seal 2 between the vehicle body and chassis after a period of use.

[0273] In some embodiments, the temperature of the first environment is 20°C to 28°C, the temperature of the second environment is 60°C to 120°C, the temperature of the third environment is -50°C to -10°C, and the temperature of the fourth environment is 45°C to 55°C.

[0274] In this testing method, the temperature of the first environment is normal, the temperature of the second environment is high, the temperature of the third environment is low, and the temperature of the fourth environment is moderately high. The temperature range of the above four different environments can almost simulate the temperature range that the vehicle may experience during use, increasing the matching degree between the environmental test and the actual situation and improving the accuracy of the evaluation simulation.

[0275] In one possible design, the temperature of the first environment is 23℃, the temperature of the second environment is 90℃, the temperature of the third environment is -40℃, and the temperature of the fourth environment is 50℃.

[0276] In this testing method, the temperature of the first environment is room temperature, so the first environment is used to simulate a normal temperature environment (such as a spring environment or an autumn environment).

[0277] The second environment is at a high temperature, which can simulate the environment of high-heat areas of a vehicle (such as areas where batteries are installed). It is worth noting that the temperature of the second environment can be higher than the highest temperature of the high-heat areas of the vehicle, so that the vehicle corresponding to the seal 2 that has passed the waterproof test can also have good waterproof performance in high-heat areas.

[0278] The third environment is characterized by a low temperature, which can be used to simulate winter conditions. It is worth noting that the temperature of the third environment can be lower than the lowest winter temperature in the area where the vehicle user group or the vehicle sales market is located. This ensures that the vehicle corresponding to the waterproof seal 2, which has passed the waterproof test, will maintain good waterproof performance even when encountering the lowest temperatures in that area.

[0279] The fourth environment has a relatively high temperature, which can be used to simulate summer conditions. It is worth noting that the temperature of the third environment can be higher than the highest summer temperature in the area where the vehicle user group or the vehicle sales market is located. This ensures that the vehicle corresponding to the seal 2 that passed the waterproof test can maintain good waterproof performance even when encountering the highest summer temperatures in that area.

[0280] In one possible design, high and low temperature cycling is performed multiple times sequentially. After the sealing performance test fixture 1 with seal 2 installed completes a fourth set time in the fourth environment, the high and low temperature cycle is considered complete. The process then continues by maintaining the sealing performance test fixture 1 with seal 2 installed in the first environment for a first set time, which is the second high and low temperature cycle. By performing one round of high and low temperature cycling, the environmental changes of the vehicle over a period of time (e.g., within a year) can be simulated. By performing multiple high and low temperature cycles, the state of seal 2 after a relatively longer period of use can be simulated, allowing for the evaluation of the waterproof performance of seal 2 after a relatively longer period of use.

[0281] For example, high and low temperature cycles are performed at least ten times in sequence. By varying the temperature and time during a high and low temperature cycle, the environmental changes of a vehicle within a year can be simulated. Performing high and low temperature cycles at least ten times can simulate the environmental changes of a vehicle driving for at least ten years (more than 240,000 kilometers). After multiple high and low temperature cycles, a waterproof test is performed to simulate the waterproof performance of the sealing interface between the vehicle body and chassis after ten years or more of vehicle use, so as to evaluate the waterproof performance of the seal 2 after long-term use.

[0282] In one possible design, after the sealing performance testing fixture 1 with the seal 2 installed is placed in the second environment and maintained for a second set time, and before the sealing performance testing fixture 1 with the seal 2 installed is placed in the third environment, the design further includes: switching the sealing performance testing fixture 1 with the seal 2 installed from the third environment to the first environment. Since the temperature of the first environment is lower than the temperature of the second environment, and the temperature of the third environment is lower than the temperature of the first environment, the temperature difference between the second and third environments is greater than the temperature difference between the second and first environments. Therefore, during the process of switching from the second environment to the third environment, switching from the second environment to the first environment first allows the first environment to serve as a transitional state, avoiding a sudden drop in temperature, thus more closely reflecting the actual usage conditions of the vehicle.

[0283] In this testing method, the first environment is used as the baseline environment. After simulating the second environment, the sealing performance testing fixture 1 is switched from the second environment back to the first environment, that is, the sealing performance testing fixture 1 with the seal 2 installed is restored to the baseline environment to facilitate subsequent environment switching. In addition, this environmental change pattern is closer to the environmental change pattern during actual vehicle use and is more similar to real vehicle usage conditions.

[0284] In one possible design, after the sealing performance testing fixture 1 with the seal 2 installed is placed in the third environment and kept in the third set time, and before the sealing performance testing fixture 1 with the seal 2 installed is placed in the fourth environment, the design further includes: switching the sealing performance testing fixture 1 with the seal 2 installed from the third environment to the first environment.

[0285] Since the temperature of the first environment is lower than that of the fourth environment, and the temperature of the third environment is lower than that of the first environment, the temperature difference between the fourth environment and the third environment is greater than the temperature difference between the fourth environment and the first environment. Therefore, when switching from the third environment to the fourth environment, switching from the third environment to the first environment first can serve as a transitional state, avoiding a sudden rise in temperature and thus more closely reflecting the actual usage conditions of the vehicle.

[0286] In this testing method, the first environment is used as the baseline environment. After simulating the third environment, the sealing performance testing fixture 1 is switched from the third environment back to the first environment, that is, the sealing performance testing fixture 1 with the seal 2 installed is restored to the baseline environment to facilitate subsequent environment switching. In addition, this environmental change pattern is closer to the environmental change pattern during actual vehicle use and is more similar to real vehicle usage conditions.

[0287] In one possible design, after the sealing performance testing fixture 1 with the seal 2 installed is placed in the fourth environment and maintained for a fourth set time, the design further includes: switching the sealing performance testing fixture 1 with the seal 2 installed from the fourth environment to the first environment.

[0288] After the test in the fourth environment, the sealing performance test fixture 1 with the seal 2 installed may undergo the next high and low temperature cycle or the subsequent waterproof test. Regardless of whether the next high and low temperature cycle or the subsequent waterproof test is carried out, it is carried out in the first environment. Therefore, after the test in the four environments, the environment of the sealing performance test fixture 1 with the seal 2 installed is switched to the first environment to facilitate the subsequent cycle test or the subsequent waterproof test.

[0289] Environment information can include not only temperature but also relative humidity. Relative humidity (RH) is the ratio of the actual water vapor pressure in the air to the saturated water vapor pressure at the given temperature, usually expressed as a percentage. Different environments can have the same or different relative humidity levels, which can be set according to the specific meaning of each environment. For example, if four environments are set to correspond to the four seasons, the relative humidity in each environment can also be set based on the relative humidity of the same geographical location in each season.

[0290] In some embodiments, the relative humidity of the first environment, the second environment, and the third environment are the same, while the relative humidity of the fourth environment is greater than that of the first environment. In the above embodiments, when setting the fourth environment, a summer state is simulated. Since the relative humidity in summer is typically higher than in other seasons, in this embodiment, the relative humidity of the fourth environment is made greater than that of the other environments.

[0291] In this testing method, the environment is controlled not only from the perspective of temperature, but also from the perspective of relative humidity, so as to simulate the actual environmental changes that the seal 2 is in during use more closely.

[0292] In other embodiments, after the tooling is installed and before the waterproofing test is performed, an environmental test is also performed, including a high temperature and high humidity test, which includes placing the sealing performance test tooling 1 with the seal 2 installed in a fifth environment for a fifth set time, wherein the temperature of the fifth environment is 83°C to 87°C and the relative humidity of the fifth environment is 83% to 87%.

[0293] The fifth environment has a temperature between 83°C and 87°C, such as 83°C, 84°C, 85°C, 86°C, or 87°C. This temperature range is considered high, higher than typical ambient temperatures. The fifth environment also has a relative humidity between 83% and 87%, such as 83%, 84%, 85%, 86%, or 83%. This humidity range is considered high, higher than typical ambient humidity. High temperature and high humidity environments typically accelerate material aging; therefore, aging tests can be performed on seal 1 under these conditions to evaluate its sealing performance.

[0294] In some embodiments, the temperature of the fifth environment is 85°C and the relative humidity of the fifth environment is 85%. Testing in an environment with a temperature of 85°C and a relative humidity of 85% is also known as a high-temperature and high-humidity double 85 test. This test verifies the limits that the seal 2 in the sealing performance testing fixture 1, equipped with the seal 2, can withstand in a high-temperature and high-humidity environment by aging the fixture under extreme conditions. It is used to evaluate the durability of the seal 2 in the sealing performance testing fixture 1 under high-temperature and high-humidity conditions, simulating the durability of the vehicle body and chassis under extreme conditions. Subsequent waterproofing tests then evaluate whether the waterproofing performance of the vehicle body and chassis meets the standards after undergoing extreme conditions.

[0295] In this test method, the seal 2 is first subjected to a high temperature and high humidity test, and then a waterproof test is performed. This method can be used to test and evaluate the waterproof performance of the seal 2 after it has been subjected to an extremely harsh environment.

[0296] In some embodiments, the fifth set time is equal to or greater than 480 hours.

[0297] In this testing method, the high temperature and humidity test takes a relatively long time, which can be used to evaluate the waterproof performance of the seal 2 after long-term use in harsh environments.

[0298] In one possible design, the fifth setting time is 720 hours. In this test method, the high temperature and humidity test is conducted for a longer period, making the environmental test more stringent. This results in the qualified seal 1 having better durability, ensuring that the sealing performance between the vehicle body and the chassis remains in good condition for a long time.

[0299] In some embodiments, after the fixture is installed and before the waterproofing test is performed, an environmental test is also performed, including a salt spray test, which includes placing the sealing performance test fixture 1 with the seal 2 installed in a sixth environment for a sixth set time, the sixth environment being an environment with neutral salt spray.

[0300] Salt spray testing creates an environment containing a certain concentration of salt spray to simulate corrosive conditions in a saline environment. It can be used to evaluate the corrosion resistance of seal 2 in the sealing performance testing fixture 1, which contains seal 2. A waterproof test is then performed after the salt spray test. The sealing performance testing fixture 1 simulates the waterproof performance of seal 2 after the chassis and body have been exposed to a corrosive saline environment for a certain period. Neutral salt spray can be achieved by filling the test space with a saline solution containing approximately 5% sodium chloride and with a pH value between 6.5 and 7.2.

[0301] In this test method, the seal 2 is first subjected to a salt spray test, and then a waterproof test is performed, which can detect and evaluate the waterproof performance of the seal 2 after it is exposed to a corrosive environment.

[0302] In one possible design, the sixth setting time is equal to or greater than 480 hours. In this test method, the salt spray test is conducted for a relatively longer period, which allows for the evaluation of the waterproof performance of the seal 2 after prolonged use in a salt spray environment.

[0303] In one possible design, the sixth setting time is 720 hours. In this test method, the longer time makes the salt spray environment more severe, thus enabling the qualified seal 1 to have better durability.

[0304] In one possible design, after the tooling is installed and before the waterproofing test is performed, the method also includes environmental testing, which includes high and low temperature cycling test, high temperature and high humidity test and salt spray test performed in sequence, or high temperature and high humidity test, high and low temperature cycling test and salt spray test performed in sequence.

[0305] The high and low temperature cycling test includes ten high and low temperature cycles, which include:

[0306] The sealing performance testing fixture with the seal installed is placed in a first environment and kept for a first set time;

[0307] Switch the sealing performance testing fixture with the seal installed to the second environment and maintain it in the second environment for the second set time;

[0308] Switch the sealing performance testing fixture with the seal installed to the first environment and maintain it in the first environment for the seventh preset time;

[0309] Switch the sealing performance testing fixture with the seal installed to the third environment and maintain it in the third environment for the third set time;

[0310] Switch the sealing performance testing fixture with the seal installed to the first environment and maintain it in the first environment for the seventh set time;

[0311] Switch the sealing performance testing fixture with the seal installed to the fourth environment and maintain it in the fourth environment for the fourth set time;

[0312] Switch the sealing performance testing fixture with the seals installed to the first environment;

[0313] The high temperature and high humidity test includes: placing the sealing performance test fixture with the sealing element installed in the fifth environment and maintaining it in the fifth set environment for a fifth time. The temperature of the fifth environment is 85℃ and the relative humidity of the fifth environment is 85%.

[0314] The salt spray test includes placing a sealing performance testing fixture with a seal installed in a sixth environment for a sixth set time. The sixth environment is an environment with neutral salt spray.

[0315] In this testing method, the sealing performance testing fixture 1 was first subjected to high and low temperature cycling tests, high temperature and high humidity tests, and salt spray tests. Then, a waterproof test was conducted. The high and low temperature cycling tests, high temperature and high humidity tests, and salt spray tests simulated the state of the seal 2 under different environmental conditions, including the state after being subjected to harsh environments. This is closer to the state of the seal 2 in actual use, so as to obtain test results that are closer to actual applications. This is beneficial to verifying the waterproof performance of the seal 2 when it is actually applied between the vehicle body and the chassis.

[0316] In one possible design, during the above-described test method, a third pad assembly is installed between the first housing 10 and the second housing 20 during the tooling installation process.

[0317] In the above test method, since the third pad assembly is installed in the sealing performance test fixture 1, the seal 2 is in a low-pressure state. Compared with the positive pressure state and the overpressure state, the low-pressure state is more likely to have weaker waterproof performance. Therefore, if the seal 2 in the low-pressure state also meets the waterproof standard, the seal 2 in the positive pressure state and the overpressure state can also be presumed to meet the same waterproof standard. Thus, there is no need to do two other sets of tests, which simplifies the test process and improves the test efficiency.

[0318] In one possible design, the temperature of the first environment is 23°C, the relative humidity of the first environment is 50%, and the first set time is 1 hour;

[0319] The temperature of the second environment is 90℃, the relative humidity of the second environment is 50%, and the second set time is 4 hours;

[0320] The temperature of the third environment is -40℃, the relative humidity of the third environment is 50%, and the third set time is 4 hours;

[0321] The temperature of the fourth environment is 50℃, the relative humidity of the fourth environment is 95%, and the fourth setting time is 13h;

[0322] The fifth environment has a temperature of 85℃, a relative humidity of 85%, and a set time of 720h.

[0323] The sixth setting is 720 hours;

[0324] The seventh setting is 1 hour.

[0325] In this testing method, the first environment is a normal temperature environment. The stability of the seal 1 is generally strong in this environment, resulting in a relatively short time for the tooling to be in the first environment (the first set time). The second, third, and fourth environments are different relatively harsh environments, representing potential extreme conditions. For example, the second environment is a high-temperature environment, the third environment a low-temperature environment, and the fourth environment a high-humidity environment. All of these pose certain challenges to the waterproof performance of the seal 2, thus making the second, third, and fourth set times longer than the first set time. The seventh set time is the time the tooling is held in the first environment (i.e., the reference environment) after switching between two environments with significant temperature differences. The seventh set time is used to transition the tooling from a temperature-changing state to a temperature-stable state, facilitating subsequent changes in ambient temperature. This reduces the tooling's exposure to sudden temperature drops or rises, making it more closely resemble real-world temperature changes.

[0326] As can be seen from the above, this testing method simulates the environmental conditions that various vehicles are more likely to be in by conducting environmental tests on tooling in environments with relatively large temperature differences. It can simulate the actual use conditions of the seals between the vehicle chassis and body more closely, thereby obtaining more realistic evaluation data.

[0327] In one specific embodiment of this application, during the tooling installation process, a third pad assembly is installed between the first housing 10 and the second housing 20; after the tooling installation and before the waterproof test, an environmental test is also included, which includes a high and low temperature cycling test, a high temperature and high humidity test and a salt spray test performed in sequence, or a high temperature and high humidity test, a high and low temperature cycling test and a salt spray test performed in sequence.

[0328] The high and low temperature cycling test includes ten high and low temperature cycles, which include:

[0329] The sealing performance testing fixture 1 with the sealing element 2 installed is placed in a first environment and kept for a first set time. The first environment includes the temperature and relative humidity of the first environment. The temperature of the first environment is 23°C, the relative humidity of the first environment is 50%, and the first set time is 1 hour.

[0330] The sealing performance testing fixture 1 with the seal 2 installed is switched to the second environment after 1 hour. The second environment includes the temperature and relative humidity of the second environment. The temperature of the second environment is 90℃ and the relative humidity of the second environment is 50%.

[0331] The sealing performance test fixture 1 with the seal 2 installed is placed in the second environment and kept for a second set time, which is 4 hours.

[0332] The sealing performance testing fixture 1 with the seal 2 installed is switched to the first environment after 1 hour, and the sealing performance testing fixture 1 is kept in the first environment for 1 hour.

[0333] The sealing performance testing fixture 1 with the sealing element 2 installed is switched to the third environment after 1 hour. The third environment includes the temperature and relative humidity of the third environment. The temperature of the third environment is -40℃ and the relative humidity of the third environment is 50%.

[0334] The sealing performance test fixture 1, which is equipped with the seal 2, is placed in a third environment and kept for a third set time, which is 4 hours.

[0335] The sealing performance testing fixture 1 with the seal 2 installed is switched to the first environment after 1 hour, and the sealing performance testing fixture 1 is kept in the first environment for 1 hour.

[0336] The sealing performance testing fixture 1 with the seal 2 installed is switched to the fourth environment in 1 hour. The fourth environment includes the temperature and relative humidity of the fourth environment. The temperature of the fourth environment is 50°C and the relative humidity of the fourth environment is 95%.

[0337] The sealing performance test fixture 1, which is equipped with the seal 2, is placed in the fourth environment and kept for the fourth set time, which is 13 hours.

[0338] The sealing performance testing fixture 1, which is equipped with seal 2, is switched to the first environment after 1 hour;

[0339] The high temperature and high humidity test includes: placing the sealing performance test fixture 1 with the sealing component 2 installed in the fifth environment and maintaining it for the fifth set time. The fifth environment includes the temperature and relative humidity of the fifth environment. The temperature of the fifth environment is 85℃, the relative humidity of the fifth environment is 85%, and the fifth set time is 720h.

[0340] The salt spray test includes: placing the sealing performance test fixture 1, which has completed the above-mentioned high and low temperature cycle test and high temperature and high humidity test, with the seal 2 installed, in a sixth environment and maintaining it for a sixth set time. The sixth environment is an environment with neutral salt spray, and the sixth set time is 720h.

[0341] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A sealing performance testing fixture, characterized in that, include: A first housing, the first housing having a first surface; A second housing has a second surface, which is disposed opposite to the first surface, and a first gap is formed between the second surface and the first surface. The first housing and the second housing are detachably connected, and a test cavity is formed between the first housing and the second housing, with the first gap communicating with the test cavity.

2. The sealing performance testing fixture as described in claim 1, characterized in that, The first gap has a flat area, and the areas on the first surface and the second surface opposite to the flat area are both flat surfaces.

3. The sealing performance testing fixture as described in claim 2, characterized in that, The first gap has a first slope area, and the areas of the first surface and the second surface that are opposite to the first slope are both the first slope. The first slope is inclined relative to the straight surface.

4. The sealing performance testing fixture as described in claim 3, characterized in that, The first gap has a second slope area. The areas of the first surface and the second surface opposite to the second slope area are both second slopes. The second slope is inclined relative to the flat surface, and the inclination direction of the second slope is opposite to that of the first slope.

5. The sealing performance testing fixture as described in any one of claims 1 to 4, characterized in that, The first gap has a stepped area, and the area of ​​at least one of the first surface and the second surface opposite to the stepped area is a stepped surface.

6. The sealing performance testing fixture as described in any one of claims 1 to 5, characterized in that, The first gap has a rounded corner area, and the areas on the first surface and the second surface opposite to the rounded corner area are both arc surfaces.

7. The sealing performance testing fixture as described in any one of claims 1 to 6, characterized in that, The sealing performance testing fixture also includes a pad block having a spacer portion located between the first surface and the second surface, and the spacer portion being located on the side of the first gap away from the test cavity, the spacer portion being used to define the height of the first gap.

8. The sealing performance testing fixture as described in claim 7, characterized in that, The sealing performance testing fixture includes multiple pad assemblies, each pad assembly includes at least one pad, the height of the spacer portion of the pads in the same pad assembly is the same, the height of the spacer portion of the pads in different pad assemblies is different, and one of the pad assemblies is installed between the first surface and the second surface.

9. The sealing performance testing fixture as described in claim 8, characterized in that, The number of spacer assemblies is three, namely a first spacer assembly, a second spacer assembly, and a third spacer assembly. The height of the spacer portion in the first spacer assembly is H1, the height of the spacer portion in the second spacer assembly is H2, and the height of the spacer portion in the third spacer assembly is H3. The preset value of the height of the first gap is L, and the tolerance fluctuation range of the height dimension of the first gap is ±S. Therefore, H1=L, H2=LS, and H3=L+S.

10. The sealing performance testing fixture as described in claim 8, characterized in that, The pad assembly includes a plurality of pads, which are arranged circumferentially in the first gap.

11. The sealing performance testing fixture as described in any one of claims 7 to 10, characterized in that, The pad also includes a connecting part, which is connected to the spacer part. The first housing is provided with a limiting groove, and the connecting part is at least partially located in the limiting groove.

12. The sealing performance testing fixture as described in any one of claims 7 to 11, characterized in that, The first housing, the second housing, and the pad are connected by a locking structure.

13. The sealing performance testing fixture as described in claim 12, characterized in that, The first housing has a first flange, the second housing has a second flange, the first surface is located on the side of the first flange facing the second flange, and the second surface is located on the side of the second flange facing the first flange.

14. The sealing performance testing fixture as described in claim 13, characterized in that, The first flange is provided with a first mounting hole, the pad is provided with a second mounting hole, and the second flange is provided with a third mounting hole. The first mounting hole, the second mounting hole and the third mounting hole are interconnected, and the locking structure is sequentially inserted through the first mounting hole, the second mounting hole and the third mounting hole.

15. The sealing performance testing fixture as described in claim 14, characterized in that, The first mounting hole has a first opening, the second mounting hole has a second opening, and the third mounting hole has a third opening. The first opening is located on the edge region of the first flange away from the test cavity. The second opening and the third opening are both connected to the first opening, and the second opening and the third opening are both oriented in the same direction as the first opening.

16. The sealing performance testing fixture as described in any one of claims 1 to 15, characterized in that, The test chamber is equipped with a test patch that changes color when it comes into contact with water.

17. The sealing performance testing fixture as described in claim 16, characterized in that, The test patch is provided at both a first distance and a second distance from the first gap inside the test chamber, wherein the first distance is smaller than the second distance.

18. The sealing performance testing fixture as described in any one of claims 1 to 17, characterized in that, The sealing performance testing fixture includes a counterweight structure, which is disposed inside the testing chamber.

19. The sealing performance testing fixture as described in any one of claims 1 to 18, characterized in that, At least one of the first housing and the second housing is provided with an injection port and a sealing structure. The injection port is connected to the test chamber, and the sealing structure is detachably connected to the injection port and can be adapted to seal the injection port.

20. A testing apparatus, characterized in that, It includes a water tank and a sealing performance testing fixture as described in any one of claims 1 to 19, wherein the water tank is used to house the sealing performance testing fixture.

21. The testing apparatus as described in claim 20, characterized in that, The water tank is detachably connected to the sealing performance testing fixture.

22. A testing method, characterized in that, The sealing performance testing fixture as described in any one of claims 1 to 19 is used, and the method includes fixture installation and waterproof testing, wherein, The tooling installation includes: fixing the sealing element to the first gap of the sealing performance testing tooling, and sealing the test cavity into a sealed cavity through the sealing element; The waterproof test includes: placing the sealing performance test fixture with the seal installed in water, such that the sealing performance test fixture with the seal installed is submerged at a first depth; after a first set time, removing the sealing performance test fixture with the seal installed, and checking whether water has entered the test chamber.

23. The test method as described in claim 22, characterized in that, The tooling installation also includes: A pad is installed between the first housing and the second housing, and the pad, the first housing, and the second housing are connected.

24. The test method as described in claim 23, characterized in that, The waterproofing test was conducted using the first pad assembly, the second pad assembly, and the third pad assembly, respectively.

25. The test method as described in claim 22, characterized in that, After the tooling is installed and before the waterproofing test is performed, the method further includes conducting an environmental test.

26. The test method as described in claim 25, characterized in that, The environmental testing includes high and low temperature cycling testing, which includes: The sealing performance testing fixture with the seal installed is placed in various environments with different temperatures and maintained for a set time.

27. The test method as described in claim 26, characterized in that, The high and low temperature cycling test includes high and low temperature cycling, which includes: The sealing performance testing fixture with the sealing element installed is placed in a high-temperature environment and kept at high temperature for a specified time. The sealing performance testing fixture with the sealing element installed is placed in a low-temperature environment and kept at a low temperature for a specified time. The temperature of the high-temperature environment is greater than the temperature of the low-temperature environment.

28. The test method as described in claim 26, characterized in that, The high and low temperature cycling test includes high and low temperature cycling, which includes: The sealing performance testing fixture, on which the seal is installed, is placed in a first environment and kept for a first set time. The sealing performance testing fixture with the seal installed is placed in a second environment and kept for a second set time; The sealing performance testing fixture with the seal installed is placed in a third environment and kept for a third set time; The sealing performance testing fixture with the seal installed is placed in a fourth environment and kept for a fourth set time; The temperatures of the first environment, the second environment, the third environment, and the fourth environment are different.

29. The test method as described in claim 28, characterized in that, The high and low temperature cycles are performed sequentially multiple times.

30. The test method as described in claim 28, characterized in that, The temperature of the second environment is greater than the temperature of the first environment, the temperature of the third environment is less than the temperature of the first environment, and the temperature of the fourth environment is greater than the temperature of the first environment and less than the temperature of the second environment.

31. The test method as described in claim 30, characterized in that, The temperature of the first environment is 20°C to 28°C, the temperature of the second environment is 60°C to 120°C, the temperature of the third environment is -50°C to -10°C, and the temperature of the fourth environment is 45°C to 55°C.

32. The test method as described in claim 31, characterized in that, The temperature of the first environment is 23°C, the temperature of the second environment is 90°C, the temperature of the third environment is -40°C, and the temperature of the fourth environment is 50°C.

33. The test method as described in claim 28, characterized in that, After the sealing performance testing fixture with the seal installed is placed in the second environment for a second set time, and before the sealing performance testing fixture is placed in the third environment, the method further includes: switching the sealing performance testing fixture with the seal installed from the third environment to the first environment.

34. The test method as described in claim 28, characterized in that, After the sealing performance testing fixture with the seal installed is placed in the third environment and kept in the third set time, and before the sealing performance testing fixture with the seal installed is placed in the fourth environment, the method further includes: switching the sealing performance testing fixture with the seal installed from the third environment to the first environment.

35. The test method as described in claim 28, characterized in that, After the sealing performance testing fixture with the seal installed is placed in the fourth environment and kept in the fourth set time, the method further includes: switching the sealing performance testing fixture with the seal installed from the fourth environment to the first environment.

36. The test method according to any one of claims 28 to 35, characterized in that, The relative humidity of the first environment, the second environment, and the third environment are the same, and the relative humidity of the fourth environment is greater than that of the first environment.

37. The test method as described in claim 22, characterized in that, After the tooling is installed and before the waterproof test is performed, an environmental test is also performed, which includes a high temperature and high humidity test. The high temperature and high humidity test includes placing the sealing performance test tooling with the seal installed in a fifth environment for a fifth set time. The temperature of the fifth environment is 83°C to 87°C and the relative humidity of the fifth environment is 83% to 87%.

38. The test method as described in claim 37, characterized in that, The temperature of the fifth environment is 85°C, and the relative humidity of the fifth environment is 85%.

39. The test method as described in claim 37, characterized in that, The fifth set time is equal to or greater than 480h.

40. The test method as described in claim 39, characterized in that, The fifth time setting is 720 hours.

41. The test method as described in claim 22, characterized in that, After the tooling is installed, and before the waterproof test is performed, an environmental test is also performed, which includes a salt spray test. The salt spray test includes placing the sealing performance test tooling with the seal installed in a sixth environment for a sixth set time, wherein the sixth environment is an environment with neutral salt spray.

42. The test method as described in claim 41, characterized in that, The sixth set time is equal to or greater than 480h.

43. The test method as described in claim 42, characterized in that, The sixth setting time is 720h.

44. The test method as described in claim 22, characterized in that, After the tooling is installed and before the waterproof test is performed, the method further includes conducting an environmental test, which includes a high and low temperature cycling test, a high temperature and high humidity test and a salt spray test performed sequentially, or the high temperature and high humidity test, the high and low temperature cycling test and the salt spray test performed sequentially. The high and low temperature cycling test includes ten high and low temperature cycles, and the high and low temperature cycles include: The sealing performance testing fixture, on which the seal is installed, is placed in a first environment and kept for a first set time. The sealing performance testing fixture with the seal installed is switched to a second environment and kept in the second environment for a second set time. The sealing performance testing fixture with the sealing element installed is switched to the first environment and kept in the first environment for a seventh preset time; The sealing performance testing fixture with the seal installed is switched to a third environment and kept in the third environment for a third set time. The sealing performance testing fixture with the seal installed is switched to the first environment and kept in the first environment for a seventh set time. The sealing performance testing fixture with the seal installed is switched to a fourth environment and kept in the fourth environment for a fourth set time. The sealing performance testing fixture with the seal installed is switched to the first environment; The high temperature and high humidity test includes: placing the sealing performance test fixture with the sealing element installed in a fifth environment and maintaining it for a fifth set time, wherein the temperature of the fifth environment is 85°C and the relative humidity of the fifth environment is 85%. The salt spray test includes: placing the sealing performance testing fixture with the seal installed in a sixth environment for a sixth set time, wherein the sixth environment is an environment with neutral salt spray.

45. The test method as described in claim 44, characterized in that, During the tooling installation process, a third pad assembly is installed between the first housing and the second housing.

46. ​​The test method as described in claim 44 or 45, characterized in that, The temperature of the first environment is 23°C, the relative humidity of the first environment is 50%, and the first set time is 1 hour; The temperature of the second environment is 90℃, the relative humidity of the second environment is 50%, and the second set time is 4 hours; The temperature of the third environment is -40℃, the relative humidity of the third environment is 50%, and the third set time is 4 hours. The temperature of the fourth environment is 50°C, the relative humidity of the fourth environment is 95%, and the fourth set time is 13 hours. The temperature of the fifth environment is 85°C, the relative humidity of the fifth environment is 85%, and the fifth set time is 720h; The sixth set time is 720 hours; The seventh time setting is 1 hour.

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