Air filter sealing test device and test method

Abstract

This invention discloses a testing device and method for air filter sealing performance, belonging to the field of air filter testing technology. The air filter sealing performance testing device includes a vibration mechanism, an ash-adding mechanism, an air extraction mechanism, and a reference air filter. The vibration mechanism includes a vibration generating mechanism and a vibration table, with the output end of the vibration generating mechanism connected to the vibration table. The air filter to be tested is placed on the vibration table. The ash-adding mechanism is used to input air containing impurities, including at least fluorescent powder, into the air inlet of the air filter to be tested. The air extraction mechanism is connected to the air outlet of the air filter to be tested via a connecting pipe and is used to extract air from the air outlet of the air filter to be tested. The reference air filter is placed on the connecting pipe and is used to perform secondary filtration on the air filtered by the air filter to be tested. The air filter sealing performance testing method is implemented using the above-described air filter sealing performance testing device. This invention can achieve long-term sealing performance testing of air filters under vibration conditions, improving the accuracy of air filter sealing performance testing.

Description

Technical Field

[0001] This invention relates to the field of air filter testing technology, and in particular to a testing device and method for air filter sealing performance. Background Technology

[0002] An air filter, or simply air filter, is a device that removes particulate impurities from the air. Cars typically have an air filter installed in front of the engine to filter impurities from the air; without one, impurities would enter the engine, accelerating wear and tear on components.

[0003] An air filter consists of a housing and a filter element. The filter element is made of wound filter paper. Air carrying impurities flows directly through the filter element along the axial direction and is filtered through the micropores of the filter paper. The air passes smoothly through the filter paper, while impurities are adsorbed onto it. During winding, the inner and outer layers of filter paper need to be sealed with an adhesive to prevent air leakage through the gaps between them, which would prevent impurities from being adsorbed. In addition, the filter element is also sealed to the housing with a sealing ring to prevent air from flowing directly from the air inlet to the air outlet of the housing without passing through the filter element, which would also prevent filtration.

[0004] However, when the seal between the filter element and the housing is poor, or when the bonding between the inner and outer filter papers is incomplete, impurities can leak. These impurities will accumulate downstream of the filter element or escape with the air, easily entering the engine. Therefore, a sealing test is necessary for the air filter. Most existing air filter sealing tests are conducted under static conditions and are very short. In actual vehicle use, the air filter is essentially used under vibration conditions throughout its lifespan. This results in inaccurate sealing test results for existing air filters, making them of low reference value. Summary of the Invention

[0005] The purpose of this invention is to provide a testing device and method for air filter sealing performance, which can perform long-term sealing performance testing of air filters under vibration conditions, thereby improving the accuracy of air filter sealing performance testing.

[0006] To achieve the above objectives, the following technical solution is provided:

[0007] An air filter sealing performance testing device, comprising:

[0008] A vibration mechanism includes a vibration generating mechanism and a vibration table, wherein the output end of the vibration generating mechanism is connected to the vibration table; the air filter to be tested is placed on the vibration table.

[0009] An ash-adding mechanism is used to introduce air containing impurities into the air inlet of the air filter to be tested, wherein the impurities include at least fluorescent powder;

[0010] An air extraction mechanism is connected to the air outlet of the air filter to be tested via a connecting pipe, and is used to extract air from the air outlet of the air filter to be tested.

[0011] A reference air filter, located on the connecting pipe, is used to perform secondary filtration on the air filtered by the air filter to be tested.

[0012] Furthermore, a first accelerometer is installed on the vibration table.

[0013] Furthermore, the testing device also includes an ultraviolet lamp source.

[0014] Furthermore, the vibration mechanism also includes a dust-blocking component, which includes a horizontal support plate and a baffle. The baffle protrudes downward from the horizontal support plate along its outer periphery. The horizontal support plate is located on the vibration table, and the air filter to be tested is supported on the horizontal support plate.

[0015] A method for testing the air filter sealing performance using any of the above-described air filter sealing performance testing devices, the method comprising the following steps:

[0016] S1: Based on the laboratory service life and dust holding capacity of the air filter to be tested, and the dust adding speed of the dust adding mechanism, calculate the required concentration of impurities in the output air of the dust adding mechanism.

[0017] S2: Weigh the reference air filter before the test, W1;

[0018] S3: Place the air filter to be tested onto the vibration table;

[0019] S4: First start the vibration mechanism, then start the ash-adding mechanism and the air extraction mechanism. The ash-adding mechanism inputs air containing impurities into the air filter to be tested according to the impurity concentration calculated in step S1, and the air filter to be tested starts to work.

[0020] S5: Observe whether there is a fluorescent effect downstream of the filter element of the air filter under test. If there is, the air filter under test does not meet the sealing standard; if not, continue to the next step:

[0021] S6: The air filter under test continues to operate until the operating time reaches the laboratory service life of the air filter under test; the ash adding mechanism, the air extraction mechanism and the vibration mechanism all stop operating;

[0022] S7: Weigh the reference air filter after the test, W2, and compare W1 and W2; if W1 is less than W2, the air filter under test does not meet the sealing standard; if W1 is equal to W2, the air filter under test meets the sealing standard.

[0023] Furthermore, the vibration mechanism is used to drive the air filter under test to vibrate in a linear direction.

[0024] Furthermore, in step S4, the vibration mechanism drives the air filter under test to vibrate along the front-back direction of its own structure in order to perform a sealing test on the air filter under the first vibration condition.

[0025] In step S5, observe whether there is a fluorescence effect downstream of the filter element of the air filter to be tested. If there is, the air filter to be tested does not meet the sealing standard and the test ends; if not, continue to step S6.

[0026] In step S7: Weigh the reference air filter after the test, W2. If W1 is less than W2, the air filter under test does not meet the sealing standard, and the test ends. If W1 is equal to W2, the air filter under test meets the sealing standard under the first vibration condition.

[0027] Furthermore, in step S7, if the air filter under test meets the sealing standard under the first vibration condition, then continue with the following steps:

[0028] S8: Replace the filter element of the air filter under test and the reference air filter with a new one, and change the relative posture of the air filter under test and the vibration table so that the vibration mechanism drives the air filter under test to vibrate in the left and right directions of its own structure to perform a sealing test of the air filter under test under the second vibration condition.

[0029] S9: Repeat steps S1-S4;

[0030] S10: Observe whether there is a fluorescent effect downstream of the filter element of the air filter under test. If there is, the air filter under test does not meet the sealing standard and the test ends; if not, repeat step S6.

[0031] S11: Weigh the reference air filter after the test, W2, and compare W1 and W2; if W1 is less than W2, the air filter under test does not meet the sealing performance standard, and the test ends; if W1 is equal to W2, the air filter under test also meets the sealing performance standard under the second vibration condition.

[0032] Furthermore, in step S11, if the air filter under test meets the sealing standard under the second vibration condition, then continue with the following steps:

[0033] S12: Continue to replace the filter element of the air filter under test and the reference air filter with a new one, and change the relative posture of the air filter under test and the vibration table so that the air filter under test vibrates in the up and down direction of its own structure to perform a sealing test on the air filter under test under the third vibration condition.

[0034] S13: Repeat steps S1-S4;

[0035] S14: Observe whether there is a fluorescent effect downstream of the filter element of the air filter to be tested. If there is, the air filter to be tested does not meet the sealing standard and the test ends; if not, repeat step S6.

[0036] S15: Weigh the reference air filter after the test, W2, and compare W1 and W2; if W1 is less than W2, the air filter under test does not meet the sealing standard, and the test ends; if W1 is equal to W2, the air filter under test meets the sealing standard, and the test ends.

[0037] Furthermore, the laboratory lifespan of the air filter under test is obtained through the following steps:

[0038] A1: Install the air filter to be tested on a physical vehicle, and install a second accelerometer on the air filter to be tested. The second accelerometer is used to measure the acceleration signal of the air filter to be tested.

[0039] A2: The actual vehicle is started for road testing, and the acceleration signal of the second accelerometer is collected in real time;

[0040] A3: Analyze the acceleration signal from the second accelerometer to obtain the time-domain data of the vibration of the air filter under test;

[0041] A4: Convert the time-domain data of the vibration of the air filter under test into frequency-domain data, and obtain the laboratory service life of the air filter under test based on the frequency-domain data and the actual service life of the air filter under test.

[0042] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0043] First, the vibration mechanism allows the air filter to operate under vibration conditions, fully simulating the usage conditions of an air filter in a real vehicle. Second, the vibration mechanism can operate continuously, allowing for a sufficiently long test time to fully assess the air filter's sealing performance throughout its entire service life. Third, using fluorescent powder as an impurity facilitates observation and provides a direct view of the test results. Using a reference air filter as a supplementary method further improves the accuracy of the test results. Therefore, the test results obtained using the air filter sealing performance testing device and method of this invention are highly accurate and have significant reference value. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the air filter sealing performance testing device in an embodiment of the present invention;

[0045] Figure 2 This is a schematic diagram of the assembly of the second accelerometer and the air filter to be tested in an embodiment of the present invention.

[0046] Figure label:

[0047] 100. Air filter under test; 101. Air inlet; 102. Air outlet; 103. Observation window; 200. Data acquisition system; 300. Second accelerometer;

[0048] 10. Vibration mechanism; 11. Vibration generating mechanism; 12. Vibration table; 13. Dust-blocking component; 131. Horizontal support plate; 132. Baffle;

[0049] 20. Ash-adding mechanism; 30. Air extraction mechanism;

[0050] 40. Connecting pipe; 41. Flow meter; 42. Pressure gauge;

[0051] 50. Reference air filter; 60. Ultraviolet lamp source; 70. First accelerometer. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0053] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0054] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0055] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device 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 the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0056] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0057] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0058] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0059] This embodiment provides a testing device for air filter sealing performance, mainly used to test the sealing performance of the adhesive between the multiple layers of filter paper in the air filter element and the sealing performance between the filter element and the housing. Specifically, refer to... Figure 1 The air filter sealing performance testing device includes a vibration mechanism 10, an ash-adding mechanism 20, an air extraction mechanism 30, and a reference air filter 50. The vibration mechanism 10 includes a vibration generating mechanism 11 and a vibration table 12. The output end of the vibration generating mechanism 11 is connected to the vibration table 12 to drive the vibration table 12 to vibrate. The air filter under test 100 is placed on the vibration table 12. When the vibration mechanism 10 is activated, the air filter under test 100 vibrates along with the vibration table 12, thereby simulating the scenario of the air filter under test 100 working under vibration conditions. In specific implementation, the vibration mechanism 10 can operate continuously, providing conditions for long-term air filter sealing performance testing.

[0060] The ash-adding mechanism 20 is used to input air containing impurities into the air inlet 101 of the air filter 100 under test, to simulate the situation where the air also contains impurities in the actual working scenario of the air filter; the impurities include at least phosphor. Further, in the ash-adding mechanism 20, the impurities in the air containing impurities are a mixture of quartz sand and phosphor; before testing, the quartz sand and phosphor are mixed in a certain proportion and then placed into the ash-adding mechanism 20. Of course, in other embodiments, the impurities in the air containing impurities can also be a mixture of other materials and phosphor, which is not specifically limited here. When the sealing between the multiple layers of filter paper in the filter element is poor, since most impurities will accumulate downstream of the filter element, the phosphor, as part of the impurities, also adheres downstream of the filter element. This can often be observed with the naked eye, thus indicating whether the air filter's sealing performance meets the standard; that is, if there is a fluorescent effect downstream of the filter element, the air filter's sealing performance does not meet the standard. In specific implementation, the phosphor can be a phosphor that has a fluorescent effect under natural light or a phosphor that has a fluorescent effect under ultraviolet light. Furthermore, the testing device also includes an ultraviolet lamp source 60. When a phosphor that exhibits fluorescence under ultraviolet light is selected, the fluorescence effect can be clearly observed when irradiated by the ultraviolet lamp source 60, facilitating visual observation and judgment by personnel. In specific implementation, an observation window 103 can be opened near the air outlet 102 of the air filter 100 under test, allowing personnel to observe whether there is a fluorescence effect downstream of the filter element. Of course, the setting of the observation window 103 should not affect the normal use of the air filter.

[0061] The air extraction mechanism 30 is connected to the air outlet 102 of the air filter 100 under test via a connecting pipe 40, and is used to extract air from the air outlet 102 of the air filter 100 under test; here, the air extraction mechanism 30 plays the role of providing power for the flow of air in the air filter 100 under test. Furthermore, a flow meter 41 and a pressure gauge 42 are installed on the connecting pipe 40 to obtain the gas flow rate and gas pressure in the connecting pipe 40 in real time, thereby providing a reference for the air extraction mechanism 30 to reasonably set the extraction parameters.

[0062] A reference air filter 50 is installed on the connecting pipe 40 to perform secondary filtration on the air filtered by the air filter 100 under test. In actual operation, impurities may leak out from the adhesive joints between the multiple layers of filter paper in the filter element and escape from the air filter outlet 102 instead of adhering to the downstream of the filter element; or, if there is a problem with the seal between the filter element and the housing, most impurities will not pass through the filter element but will escape directly from the air filter outlet 102. Therefore, judging the air filter's seal compliance solely based on the absence of fluorescence downstream of the filter element will lead to misjudgment. To capture the impurities escaping from the air filter outlet 102 in the above two situations, this embodiment installs a reference air filter 50 on the connecting pipe 40 to perform secondary filtration on the air filtered by the air filter 100 under test. In specific implementation, if no impurities are filtered out by the reference air filter 50, the weight of the reference air filter 50 remains unchanged; if impurities are adsorbed on the reference air filter 50, the weight of the reference air filter 50 will increase. Therefore, the setting of the reference air filter 50 can serve as a supplementary measure to further improve the accuracy of the sealing test. Here, the sealing performance of the reference air filter 50 should be tested and meet the standards to ensure that all impurities flowing out of the air filter 100 under test can be absorbed by the reference air filter 50.

[0063] Furthermore, the testing device also includes a dust-blocking component 13, which includes a horizontal support plate 131 and a baffle 132. The baffle 132 protrudes downward from the outer periphery of the horizontal support plate 131. The horizontal support plate 131 sits on the vibration table 12, and the air filter 100 under test is supported on the horizontal support plate 131. During the sealing test, impurities will inevitably exist in the test environment. The dust-blocking component 13 effectively prevents impurities from drifting to the vibration mechanism 10, especially the vibration generating mechanism 11 of the vibration mechanism 10, ensuring the normal operation of the vibration mechanism 10.

[0064] Furthermore, a first accelerometer 70 is also provided on the vibration table 12 to measure the acceleration information of the vibration table 12, thereby obtaining the vibration parameters of the vibration table 12.

[0065] This embodiment also provides a method for testing the air filter sealing performance using the above-mentioned air filter sealing performance testing device. Specifically, the testing method includes the following steps:

[0066] S1: Based on the laboratory service life and dust capacity of the air filter 100 to be tested, and the dust addition rate of the dust addition mechanism 20, calculate the required concentration of impurities in the output air of the dust addition mechanism 20.

[0067] S2: Weigh the reference air filter 50 before the test, W1;

[0068] S3: Place the air filter 100 to be tested on the vibration table 12;

[0069] S4: First start the vibration mechanism 10, then start the ash-adding mechanism 20 and the air extraction mechanism 30. The ash-adding mechanism 20 inputs air containing impurities into the air filter to be tested 100 according to the impurity concentration calculated in step S1, and the air filter to be tested 100 starts to work.

[0070] S5: Observe whether there is a fluorescent effect downstream of the filter element of the air filter 100 under test. If there is, the air filter 100 under test does not meet the sealing standard; if not, continue to the next step:

[0071] S6: The air filter under test 100 continues to work until the working time reaches the laboratory service life of the air filter under test 100; the ash adding mechanism 20, the air extraction mechanism 30 and the vibration mechanism 10 all stop working;

[0072] S7: Weigh the reference air filter 50 after the test, and compare W1 and W2; if W1 is less than W2, the air filter 100 under test does not meet the sealing standard; if W1 is equal to W2, the air filter 100 under test meets the sealing standard.

[0073] Dust holding capacity is the maximum amount of impurity particles that a filter element can retain during use. Since the testing period for the air filter 100 is relatively long, to ensure that the air filter 100 maintains its filtration performance throughout the testing period—that is, to ensure that the dust holding capacity of the air filter 100 remains unsaturated and to avoid interfering with the sealing test—it is necessary to set the impurity concentration in the air input to the dust adding mechanism 20. Specifically, the impurity concentration is calculated based on the laboratory service life and dust holding capacity of the air filter 100, as well as the dust adding rate of the dust adding mechanism 20. After the calculation is completed, the dust adding mechanism 20 inputs air containing impurities into the air inlet of the air filter 100 according to the calculated impurity concentration.

[0074] In practice, considering both testing costs and efficiency, it is impossible to make the air filter operate according to its actual service life during testing. However, by changing the working conditions of the air filter in a laboratory environment, its service life can be greatly shortened. This can simulate the situation where the air filter operates according to its actual service life on a real vehicle, which helps to significantly shorten the testing time and reduce testing costs. Here, the shortened service life is referred to as the laboratory service life of the air filter.

[0075] Specifically, the laboratory lifespan of the air filter 100 under test is obtained through the following steps:

[0076] A1: Install the air filter 100 to be tested on a physical vehicle, and install a second accelerometer 300 on the air filter 100 to be tested. The second accelerometer 300 is used to measure the acceleration signal of the air filter 100 to be tested.

[0077] A2: The actual vehicle starts a road test, and the acceleration signal of the second accelerometer 300 is collected in real time;

[0078] A3: Analyze the acceleration signal of the second accelerometer 300 to obtain the time-domain data of the vibration of the air filter 100 under test;

[0079] A4: Convert the time-domain data of the vibration of the air filter 100 under test into frequency-domain data, and obtain the laboratory service life of the air filter 100 under test based on the frequency-domain data and the actual service life of the air filter 100 under test.

[0080] refer to Figure 2 After the second accelerometer 300 is installed on the air filter 100 under test, it is connected to the data acquisition system 200 via a data cable to collect the corresponding acceleration data. The data acquisition system 200 can further transmit the relevant data to the data processing system, and finally obtain the laboratory service life of the air filter 100 under test through data processing. The specific data processing process is a conventional operation in this field and will not be described in detail here.

[0081] This embodiment provides a test method for air filter sealing performance, which simulates the air filter's operating conditions under vibration conditions, fully mimicking the actual operating conditions of the air filter in a real vehicle. At the same time, it allows the air filter to operate continuously within its laboratory service life, with a sufficiently long test time. This enables a thorough test of the air filter's sealing performance throughout its entire service life, resulting in highly accurate and valuable test results.

[0082] Once the air filter is relatively fixed in a vehicle, it vibrates along with the vehicle's vibrations. The vibration conditions of a vehicle are complex and do not occur in a single direction, but they can be decomposed using a Cartesian coordinate system into vibration components in three mutually perpendicular directions: generally, vibrations along the vehicle's front-rear, left-right, and up-down directions. Furthermore, since the air filter's structure and its installation position on the vehicle are fixed, during installation, the front-rear direction of the air filter's structure can be aligned with the vehicle's front-rear direction, the left-right direction with the vehicle's left-right direction, and the up-down direction with the vehicle's left-right direction. That is, under actual vibration conditions, the air filter will vibrate in three directions: front-rear, left-right, and up-down.

[0083] An accelerometer is an instrument that measures linear acceleration and can only measure acceleration signals in a single linear direction. Therefore, three second accelerometers 300 are set up at different locations on the air filter to obtain acceleration signals from the air filter in the front-back, left-right, and up-down directions, respectively. This allows the acquisition of vibration parameters of the air filter vibrating along three different linear directions. When determining the laboratory lifespan of the air filter, the signals from the three second accelerometers 300 are combined to obtain the combined acceleration signal of the air filter. Data analysis is then performed on this combined acceleration signal to obtain the comprehensive vibration parameters, ultimately determining the specific laboratory lifespan of the air filter.

[0084] In one embodiment, the vibration mechanism 10 can drive the air filter under test 100 to vibrate simultaneously in three directions: front-back, left-right, and up-down. That is, the vibration mechanism 10 can completely simulate the vibration conditions of the air filter under test 100 in actual use. However, such a vibration mechanism 10 is generally complex in design and extremely expensive. Moreover, since the vibration parameters of the air filter are different in different linear directions under actual working conditions, the control difficulty of such a vibration mechanism 10 is further increased.

[0085] In this embodiment, the vibration mechanism 10 is used to drive the air filter 100 under test to vibrate along a specific linear direction. Thus, the vibration mechanism 10 can achieve the relevant drive using only a simple vibration motor, resulting in low cost. However, when using this vibration mechanism 10 for sealing testing, the test process needs to be performed three times. In the first test, the vibration mechanism 10 drives the air filter 100 under test to vibrate along the front-back direction of its own structure, thereby obtaining the sealing test result of the air filter 100 under the first vibration condition. In the second test, the relative posture of the air filter 100 under test and the vibration table 12 is changed, causing the vibration mechanism 10 to drive the air filter 100 under test to vibrate along the left-right direction of its own structure, thereby obtaining the sealing test result of the air filter 100 under the second vibration condition. In the third test, the relative posture of the air filter 100 under test and the vibration table 12 is changed, causing the vibration mechanism 10 to drive the air filter 100 under test to vibrate along the up-down direction of its own structure, thereby obtaining the sealing test result of the air filter 100 under the third vibration condition. If any one of the three tests shows that the air filter 100 fails to meet the sealing standard, then the air filter 100 under test is considered to have failed to meet the sealing standard. Only if the air filter 100 meets the sealing standard in all three tests can it be determined that the air filter 100 under test has met the sealing standard.

[0086] When applying the above testing methods to the first test, the following supplementary explanations are required for the relevant steps:

[0087] In step S4, the vibration mechanism 10 drives the air filter under test 100 to vibrate along the front-back direction of its own structure in order to perform a sealing test on the air filter under test 100 under the first vibration condition.

[0088] In step S5, observe whether there is a fluorescent effect downstream of the filter element of the air filter 100 under test. If there is, the air filter 100 under test does not meet the sealing standard under the first vibration condition, that is, the air filter 100 under test does not meet the sealing standard, and the test ends; if not, continue to step S6.

[0089] In step S7: Weigh the reference air filter 50 after the test, weigh W2, and compare W1 and W2; if W1 is less than W2, the air filter 100 under test does not meet the sealing standard under the first vibration condition, that is, the air filter 100 under test does not meet the sealing standard, and the test ends; if W1 is equal to W2, the air filter 100 under test meets the sealing standard under the first vibration condition.

[0090] If the air filter under test 100 fails to meet the sealing standard under the first vibration condition in the first test, it can be determined that the air filter under test 100 fails to meet the sealing standard, and there is no need to carry out the following tests to avoid unnecessary waste of resources.

[0091] Furthermore, in step S8, if the air filter 100 under test meets the sealing standard under the first vibration condition, the test process needs to continue, and a second test is performed. Therefore, the test method also includes the following steps:

[0092] S8: Replace the filter elements of the air filter under test 100 and the reference air filter 50 with new ones, and change the relative posture of the air filter under test 100 and the vibration table 12 so that the vibration mechanism 10 drives the air filter under test 100 to vibrate in the left and right directions of its own structure, and conduct a sealing test of the air filter under test 100 under the second vibration condition.

[0093] S9: Repeat steps S1-S4;

[0094] S10: Observe whether there is a fluorescent effect downstream of the filter element of the air filter 100 under test. If there is, the air filter 100 under test does not meet the sealing standard under the second vibration condition, that is, the air filter 100 under test does not meet the sealing standard, and the test ends; if not, repeat step S6:

[0095] S11: Weigh the reference air filter 50 after the test, and compare W1 and W2; if W1 is less than W2, the air filter 100 under test does not meet the sealing performance under the second vibration condition, that is, the air filter 100 under test does not meet the sealing performance, and the test ends; if W1 equals W2, the air filter 100 under test also meets the sealing performance under the second vibration condition.

[0096] This completes the second testing process.

[0097] Furthermore, in step S11, if the air filter 100 under test meets the sealing standard under the second vibration condition, the test process needs to continue, and a third test is performed; therefore, the test method also includes the following steps:

[0098] S12: Continue to replace the filter elements of the air filter under test 100 and the reference air filter 50 with new ones, and change the relative posture of the air filter under test 100 and the vibration table 12 so that the vibration mechanism 10 drives the air filter under test 100 to vibrate in the up and down direction of its own structure, and conduct a sealing test of the air filter under test 100 under the third vibration condition.

[0099] S13: Repeat steps S1-S4;

[0100] S14: Observe whether there is a fluorescent effect downstream of the filter element of the air filter 100 under test. If there is, the air filter 100 under test does not meet the sealing standard under the third vibration condition, that is, the air filter 100 under test does not meet the sealing standard, and the test ends; if not, repeat step S6.

[0101] S15: Weigh the reference air filter 50 after the test, and compare W1 and W2. If W1 is less than W2, the air filter 100 under test does not meet the sealing standard under the third vibration condition, that is, the air filter 100 under test does not meet the sealing standard, and the test ends. If W1 is equal to W2, the air filter 100 under test also meets the sealing standard under the third vibration condition, that is, the air filter 100 under test meets the sealing standard, and the test ends.

[0102] Thus, all three testing processes are now complete. The above testing process fully considers and simulates the sealing performance of the air filter under test 100 under three different vibration conditions. The testing process is more rigorous and complete, and the resulting sealing performance test results of the air filter under test 100 are more reliable and have greater reference value.

[0103] Furthermore, since the vibration parameters of the air filter differ in the front-to-back, left-to-right, and up-to-down directions on a real vehicle, the vibration parameters output by the vibration mechanism 10 will also differ when simulating different vibration conditions on the testing device. Therefore, it is necessary to convert the measured vibration parameters in different directions from the time domain to the frequency domain so that the vibration mechanism 10 can drive vibration according to the converted parameters, making the entire testing process closer to actual usage. Specifically, the acceleration data under different vibration conditions during the test can be obtained through the first accelerometer 70 installed on the vibration table 12, thereby obtaining the relevant vibration parameters for comparison and reference.

[0104] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for testing the sealing performance of an air filter, characterized in that, An apparatus for testing the sealing performance of an air filter, the apparatus comprising: The vibration mechanism (10) includes a vibration generating mechanism (11) and a vibration table (12), wherein the output end of the vibration generating mechanism (11) is connected to the vibration table (12); the air filter (100) to be tested is placed on the vibration table (12); Ashing mechanism (20) is used to input air containing impurities into the air inlet (101) of the air filter (100) to be tested, the impurities including at least fluorescent powder; An air extraction mechanism (30) is connected to the air outlet (102) of the air filter (100) to be tested via a connecting pipe (40) for extracting air from the air outlet (102) of the air filter (100) to be tested; A reference air filter (50) is provided on the connecting pipe (40) for secondary filtration of the air filtered by the air filter to be tested (100); The testing method includes the following steps: S1: Based on the laboratory service life and ash holding capacity of the air filter (100) to be tested, and the ash adding speed of the ash adding mechanism (20), calculate the required concentration of impurities in the output air of the ash adding mechanism (20); S2: Weigh the reference air filter (50) before testing, W1; S3: Place the air filter (100) to be tested onto the vibration table (12); S4: First start the vibration mechanism (10), then start the ash-adding mechanism (20) and the air extraction mechanism (30). The ash-adding mechanism (20) inputs air with impurities into the air filter to be tested (100) according to the impurity concentration calculated in step S1, and the air filter to be tested (100) starts to work. S5: Observe whether there is a fluorescent effect downstream of the filter element of the air filter (100) to be tested. If there is, the air filter (100) to be tested does not meet the sealing standard; if not, continue to the next step: S6: The air filter to be tested (100) continues to work until the working time reaches the laboratory service life of the air filter to be tested (100); the ash adding mechanism (20), the air extraction mechanism (30) and the vibration mechanism (10) all stop working; S7: Weigh the reference air filter (50) after the test, and compare W1 and W2; if W1 is less than W2, the air filter (100) to be tested does not meet the sealing standard; if W1 is equal to W2, the air filter (100) to be tested meets the sealing standard. The laboratory lifespan of the air filter (100) to be tested was obtained through the following steps: A1: Install the air filter (100) to be tested on a physical vehicle, and install a second accelerometer (300) on the air filter (100) to be tested. The second accelerometer (300) is used to measure the acceleration signal of the air filter (100) to be tested. A2: The actual vehicle starts a road test, and the acceleration signal of the second accelerometer (300) is collected in real time; A3: The acceleration signal of the second accelerometer (300) is analyzed to obtain the time domain data of the vibration of the air filter (100) under test; A4: Convert the time-domain data of the vibration of the air filter (100) under test into frequency-domain data, and obtain the laboratory service life of the air filter (100) under test based on the frequency-domain data and the actual service life of the air filter (100). The vibration mechanism (10) is used to drive the air filter (100) under test to vibrate in a linear direction; In step S4, the vibration mechanism (10) drives the air filter under test (100) to vibrate along the front-back direction of its own structure in order to perform a sealing test on the air filter under test (100) under the first vibration condition. In step S5, observe whether there is a fluorescence effect downstream of the filter element of the air filter (100) to be tested. If there is, the air filter (100) to be tested does not meet the sealing standard and the test ends; if not, continue to step S6. In step S7: Weigh the reference air filter (50) after the test, and if W1 is less than W2, the air filter (100) under test does not meet the sealing standard and the test ends; if W1 is equal to W2, the air filter (100) under test meets the sealing standard under the first vibration condition.

2. The test method according to claim 1, characterized in that, The vibration table (12) is equipped with a first accelerometer (70).

3. The test method according to claim 1, characterized in that, The testing device also includes an ultraviolet lamp source (60).

4. The test method according to claim 1, characterized in that, The vibration mechanism (10) further includes a dust baffle (13), which includes a horizontal support plate (131) and a baffle (132). The baffle (132) protrudes downward from the horizontal support plate (131) along the outer periphery of the horizontal support plate (131). The horizontal support plate (131) is located on the vibration table (12), and the air filter (100) to be tested is supported on the horizontal support plate (131).

5. The test method according to claim 1, characterized in that, In step S7, if the air filter (100) under test meets the sealing standard under the first vibration condition, then continue with the following steps: S8: Replace the filter element of the air filter under test (100) and the reference air filter (50) with a new filter element, and change the relative posture of the air filter under test (100) and the vibration table (12) so that the vibration mechanism (10) drives the air filter under test (100) to vibrate in the left and right directions of its own structure, and perform a sealing test of the air filter under test (100) under the second vibration condition. S9: Repeat steps S1-S4; S10: Observe whether there is a fluorescent effect downstream of the filter element of the air filter (100) to be tested. If there is, the air filter (100) to be tested does not meet the sealing standard and the test ends; if not, repeat step S6. S11: Weigh the reference air filter (50) after the test, and compare W1 and W2; if W1 is less than W2, the air filter (100) under test does not meet the sealing standard and the test ends; if W1 is equal to W2, the air filter (100) under test also meets the sealing standard under the second vibration condition.

6. The test method according to claim 5, characterized in that, In step S11, if the air filter (100) under test meets the sealing standard under the second vibration condition, then continue with the following steps: S12: Continue to replace the filter element of the air filter under test (100) and the reference air filter (50) with a new filter element, and change the relative posture of the air filter under test (100) and the vibration table (12) so that the air filter under test (100) vibrates in the up and down direction of its own structure to perform a sealing test of the air filter under test (100) under the third vibration condition. S13: Repeat steps S1-S4; S14: Observe whether there is a fluorescent effect downstream of the filter element of the air filter (100) to be tested. If there is, the air filter (100) to be tested does not meet the sealing standard and the test ends; if not, repeat step S6. S15: Weigh the reference air filter (50) after the test, and compare W1 and W2; if W1 is less than W2, the air filter (100) under test does not meet the sealing standard and the test ends; if W1 is equal to W2, the air filter (100) under test meets the sealing standard and the test ends.

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