Wet dust testing methods and equipment

Abstract

This invention discloses a wet dust testing method, characterized by the following steps: placing the device under test in a dust-falling environment to obtain a dust-containing device under test; adjusting the ambient temperature of the dust-containing device under test to form condensation inside the device to obtain a mud-water-containing device under test; drying the mud-water-containing device to obtain a device containing caking; and conducting a combined test on the device containing caking. By adding a temperature-changing step and a drying step between the dust-falling and combined tests, a device containing caking is formed that closely resembles a real-world environment, greatly improving the reliability of the test. Simultaneously, the temperature-changing and drying steps accelerate caking formation, ensuring test efficiency, thus effectively solving the problem of low reliability in current wet dust testing methods. This invention also discloses a wet dust testing device.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment performance testing, and more specifically, to a wet dust testing method and a wet dust testing device capable of applying the above-mentioned wet dust testing method. Background Technology

[0002] Forced air-cooled charging devices can draw in fine dust particles in real-world applications, which adhere to the surfaces of the devices. If the ambient humidity is high, the dust inside the product absorbs moisture, creating a damp environment that can cause internal short circuits, parameter drift, and corrosion, severely impacting normal operation and reducing reliability. Furthermore, through long-term practical experience, the inventors have discovered that due to repeated environmental changes and the growth of microorganisms, flaky dust structures can form inside electrical equipment. This is because dust particles combine to form flaky clumps.

[0003] Wet dust testing is necessary to address the comprehensive environmental factors encountered by products in market applications, including dust (conductive and non-conductive dust), humidity, condensation, salt spray, and microbial corrosion. Wet dust testing primarily involves accelerated testing in a laboratory using artificial simulation to verify product reliability and improve environmental adaptability through continuous product improvement. Current wet dust testing methods rely on a single, artificially simulated accelerated testing procedure, which cannot effectively simulate the caking state inside electrical equipment after long-term use. Using only a single dust-containing device for testing results in unsatisfactory results as the dust easily disperses during testing. Furthermore, the test results from dust-containing devices cannot fully reflect the caking state of the testing equipment during use, leading to low reliability of wet dust testing and an inability to accurately reflect actual conditions.

[0004] In conclusion, how to effectively solve the problem of low reliability in current wet dust testing is an urgent issue that needs to be addressed by those skilled in the art. Summary of the Invention

[0005] In view of this, the first objective of the present invention is to provide a wet dust testing method that can effectively solve the problem of low reliability of current wet dust testing experiments. The second objective of the present invention is to provide a wet dust testing device that can apply the above-mentioned wet dust testing method.

[0006] To achieve the first objective mentioned above, the present invention provides the following technical solution:

[0007] A method for testing wet dust, characterized by comprising the following steps:

[0008] The device under test is placed in a dusty environment to obtain dusty test equipment;

[0009] The ambient temperature of the dust-containing test device is adjusted so that condensation forms inside the dust-containing test device to obtain a mud-containing water test device.

[0010] The muddy water test equipment is dried to obtain a test equipment containing agglomerated flakes;

[0011] A combined test was conducted on the device containing the agglomerates.

[0012] In applying the aforementioned wet dust testing method, during the experiment, the temperature of the tested equipment with attached dust is adjusted to generate condensation. This condensed water combines with the existing dust to form muddy water, which is then dried. This process roughly simulates the agglomeration process in a real environment. The temperature adjustment helps form a muddy water structure, which, through drying, can form agglomeration structures, thus accelerating the agglomeration process and improving experimental efficiency. By adding a temperature-changing and drying step between the dust deposition and the combined test, a tested equipment containing agglomerates, closely resembling a real-world environment, is created, significantly improving experimental reliability. Simultaneously, the temperature-changing and drying steps accelerate agglomeration formation, ensuring experimental efficiency. In conclusion, this wet dust testing method effectively solves the problem of low reliability in current wet dust testing methods.

[0013] In a preferred embodiment of this application, adjusting the ambient temperature of the dust-containing test device to cause condensation to form inside the dust-containing test device, thereby obtaining a mud-containing water test device, includes:

[0014] The ambient temperature of the dust-containing test equipment is adjusted, with an adjustment range of no less than 50 degrees Celsius within two hours, and the ambient humidity is no less than 85%RH, in order to obtain the test equipment containing mud and water.

[0015] In a preferred embodiment of this application, adjusting the ambient temperature of the dust-containing test device to cause condensation to form inside the dust-containing test device, thereby obtaining a mud-containing water test device, includes:

[0016] The dust-containing test device is placed in an environment with a temperature maintained between 55 and 65 degrees Celsius and a humidity maintained between 92% and 98% RH for 2.5 to 3.5 hours.

[0017] The ambient temperature of the dust-containing test device is cooled to 3 to 7 degrees Celsius within 2 hours, and then placed in the current temperature environment for 2.5 to 3.5 hours.

[0018] The ambient temperature of the dust-containing test device is raised to 55 to 65 degrees Celsius within 2 hours, and then placed in the current temperature environment for 2.5 to 3.5 hours to obtain the mud-containing test device.

[0019] In a preferred embodiment of this application, adjusting the ambient temperature of the dust-containing test device to cause condensation to form inside the dust-containing test device, thereby obtaining a mud-containing water test device, includes:

[0020] The dust-containing test device was placed in an environment with a temperature maintained at 60 degrees Celsius and a humidity maintained at 95% RH for 3 hours;

[0021] The ambient temperature of the dust-containing test device is reduced to 5 degrees Celsius within 1.5 hours, and the ambient humidity is maintained at 95%RH. The device is then placed in the current temperature environment for 3 hours.

[0022] The ambient temperature of the dust-containing test device is raised to 60 degrees Celsius within 1.5 hours, and the ambient humidity is maintained at 95% RH. The device is then placed in the current temperature environment for 3 hours to obtain the mud-containing test device.

[0023] In a preferred embodiment of this application, the muddy water testing device is dried to obtain a flocculent testing device, comprising:

[0024] The mud-containing water test device is placed in an environment with a humidity of 0% RH for 2.5 to 3.5 hours to form a granulated test device.

[0025] In a preferred embodiment of this application, the dust falling in the dust settling environment comprises one or both of metal dust and graphite powder.

[0026] In a preferred embodiment of this application, the dust falling in the dust-falling environment comprises ash, salt, metal dust, and graphite.

[0027] In a preferred embodiment of this application, the combined test includes one, multiple, or even all of the following tests: high temperature and high humidity operation test, condensation operation test, alternating damp heat operation test, constant damp heat storage, and temperature shock test.

[0028] In a preferred embodiment of this application, before adjusting the ambient temperature of the dust-containing test device, the method further includes:

[0029] The dust-laden test device is pushed out of the dust-falling environment and into a temperature and humidity-controlled environment.

[0030] In a preferred embodiment of this application, placing the device under test in a dusty environment to obtain a dusty device under test includes:

[0031] Multiple dust particles are mixed in a preset ratio to obtain mixed dust.

[0032] The mixed dust is blown upwards at an angle to allow the dust to settle naturally, and then left to stand for a first preset time to allow the environmental particle concentration to meet the requirements.

[0033] After the fan blows air horizontally for a second preset time, the blowing stops to allow the air to enter the device under test.

[0034] After a third preset period of stillness, the tested device becomes dusty.

[0035] In a preferred embodiment of this application, the combined test on the device containing the agglomerate includes:

[0036] If an abnormality occurs in the device under test containing agglomerates during the combined test, the test shall be stopped.

[0037] Determine whether the device under test is repairable. If it is determined that the device is repairable, repair it and continue testing.

[0038] In a preferred embodiment of this application, the combined test on the device containing the agglomerate includes:

[0039] The device under test containing agglomerates is powered on and tested at room temperature. After determining that the functional status of the device under test containing agglomerates meets the requirements, a combined test is performed on the device under test containing agglomerates.

[0040] To achieve the second objective mentioned above, the present invention also provides a wet dust testing device, which is applied to any of the aforementioned wet dust testing methods. The device mainly includes a dust blowing zone capable of creating a dust settling environment; a temperature and humidity controllable zone, comprising a temperature control module for adjusting the temperature of the temperature and humidity controllable zone and a humidity control module for adjusting the humidity of the temperature and humidity controllable zone; the temperature control module has an adjustment range of not less than 50 degrees Celsius; and a support platform for supporting the device under test and capable of moving between the dust blowing zone and the temperature and humidity controllable zone.

[0041] Since the aforementioned wet dust testing method has the aforementioned technical effects, the wet dust testing equipment should also have the corresponding technical effects.

[0042] In a preferred embodiment of this application, a control device is further included, which is controlled and connected to the drive mechanism of the carrying platform, the humidity control module and the temperature control module. The control device is capable of executing control steps according to any of the above-described wet dust testing methods.

[0043] In a preferred embodiment of this application, a first fan for horizontally blowing air is provided in the dust blowing zone; and a second fan for accelerating the airflow is provided in the temperature and humidity control zone.

[0044] In a preferred embodiment of this application, a stirring zone is further included. The dust blowing zone includes a collection hopper placed at the bottom, a circulation pump whose inlet is connected to the outlet of the collection hopper, and a dust guide channel with one end connected to the circulation pump. The outlet section of the dust guide channel extends obliquely upward. The outlet of the stirring zone and the middle part of the dust guide channel are connected by an obliquely downward communicating channel.

[0045] In a preferred embodiment of this application, the dust blowing zone is equipped with a PM10 sensor and a PM2.5 sensor. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a schematic diagram of the structure of the wet dust testing method provided in an embodiment of the present invention;

[0048] Figure 2 This is a schematic diagram of the structure of the agglomerate formation method provided in an embodiment of the present invention;

[0049] Figure 3 This is a schematic diagram of the structure of the wet dust testing equipment provided in an embodiment of the present invention.

[0050] The following labels are shown in the attached diagram:

[0051] Dust blowing area 1, temperature and humidity controllable area 2, bearing platform 3, track 4, control device 5, first fan 6, particulate matter concentration sensor 7, stirring area 8, power connection port 9, door 10;

[0052] Collection hopper 11, circulation pump 12, dust guide channel 13, connecting channel 14, temperature control module 21, temperature and humidity sensor 22. Detailed Implementation

[0053] This invention discloses a wet dust testing method that can effectively solve the problem of low reliability in current wet dust testing experiments.

[0054] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] Please see Figures 1-3 , Figure 1 This is a schematic diagram of the structure of the wet dust testing method provided in an embodiment of the present invention;

[0056] Figure 2 This is a schematic diagram of the structure of the agglomerate formation method provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the wet dust testing equipment provided in an embodiment of the present invention.

[0057] In some embodiments, a wet dust testing method is provided, wherein the device under test is generally an electrical device, such as a charging device, which may be a forced air-cooled charging device or other forced air-cooled electrical devices.

[0058] The wet dust testing method may include the following steps:

[0059] Step 100: Place the device under test in a dusty environment to obtain a dusty device under test.

[0060] The device under test is placed in a dust-falling environment that simulates the way dust falls under natural environmental conditions. This simulates how dust enters the device under test in the natural environment, so that dust falls inside the device under test, thus forming a dusty device under test.

[0061] It should be noted that the dust composition in the dust settling environment can be set according to the actual working environment of the tested equipment. Generally, it can be selected from ash and soil, where the ash can be kaolin, diatomaceous earth, etc., and the salt can be a sodium salt, such as sodium chloride (NaCl).

[0062] It should be noted that dust can fall in various ways, such as by pouring from a height, forming a vortex, or by raising dust. When introducing dust into the device under test, the operation of the device's fan can be simulated, or the device's fan can be turned on directly to allow the dust-laden airflow into the device, thus obtaining images of the dust-covered interior.

[0063] Step 200: Adjust the ambient temperature of the dust-containing test device to form condensation inside the dust-containing test device to obtain the mud-containing water test device.

[0064] The dust-containing test device can be the dust-containing test device formed in step 100.

[0065] The ambient temperature of the dust-containing test device is adjusted. The environment of the dust-containing test device can be the aforementioned dust settling environment or a new temperature and humidity controllable environment.

[0066] The purpose of adjusting the ambient temperature is to induce condensation inside the dust-laden equipment under test, ensuring sufficient condensation to combine with the dust and form a muddy solution. The specific temperature adjustment range and duration can be set according to the structural characteristics of the equipment under test and the ambient humidity. If the equipment under test has many structures with high thermal conductivity, the temperature difference can be smaller; if the overall humidity of the environment is high, the temperature difference can also be smaller.

[0067] Because under certain humidity, by continuously changing the temperature of the environment where the dusty test device is located, the temperature rise rate of the device in the test device and the environment where the dusty test device is located are different, causing the water vapor in the air inside the test device to condense when it cools down. The condensation turns the dust on the surface of the device into mud.

[0068] It's important to note that muddy water differs from wet dust. Wet dust contains only a small amount of water and still exhibits a dust structure, albeit a more moist one, and remains dusty after drying. In contrast, muddy water contains significantly more water, essentially dust within water, resulting in a muddy texture. This muddy structure then dries to form a flaky, clump-like structure.

[0069] Step 300: Dry the muddy water test equipment to obtain a test equipment containing agglomerated flakes;

[0070] The above-mentioned mud-water-containing test equipment is dried, and the mud and water inside will form clumps, thus forming a test equipment containing clumps.

[0071] The drying process mainly consists of two types: drying and dehydration. For example, hot dry air can be blown over the equipment containing mud and water, or the equipment containing mud and water can be placed in an environment with very low humidity.

[0072] It should be noted that if the internal agglomerates are not formed enough, you can return to step 100 before executing step 400, and then re-execute steps 100, 200, and 300, and so on, until the agglomerate content in the device being tested meets the requirements.

[0073] Step 400: Perform a combined test on the device containing the agglomerates.

[0074] The device under test with agglomerates obtained above is a highly simulated device used in reality for a certain period of time, that is, agglomerates that meet the requirements have formed inside.

[0075] The combined tests can be conducted according to the performance requirements of the equipment under test. If multiple performance characteristics need to be measured, they can be tested one by one. Some combined tests also include a return to step 100 to repeat the cycle multiple times until the test intensity meets the requirements. The combined tests include wet dust testing.

[0076] In applying the aforementioned wet dust testing method, during the experiment, the temperature of the tested equipment with attached dust is adjusted to induce condensation. This condensed water combines with the existing dust to form muddy water, which is then dried to simulate the agglomeration process in a real environment. Furthermore, the temperature adjustment accelerates agglomeration, thus improving experimental efficiency. By adding a temperature-changing and drying step between the dust deposition and the combined test, a tested equipment with agglomerates, closely resembling that found in real-world environments, is created, significantly improving experimental reliability. Simultaneously, the temperature-changing and drying steps accelerate agglomeration, ensuring experimental efficiency. In conclusion, this wet dust testing method effectively addresses the current problem of low reliability in wet dust testing.

[0077] In some embodiments, step 200, adjusting the ambient temperature of the dust-containing test device to form condensation inside the dust-containing test device to obtain a mud-water-containing test device, may specifically include the following steps:

[0078] The ambient temperature of the dust-containing test equipment is adjusted, with an adjustment range of no less than 50 degrees Celsius within two hours, and the ambient humidity is no less than 85% RH, to obtain the test equipment containing mud and water. By controlling the temperature fluctuation range over a certain period of time, sufficient water dew formation is ensured, and the amount of water dew formed meets the requirements.

[0079] It should be noted that the ambient humidity can be controlled at 92%RH to 98%RH (Relative Humidity), specifically, it can be kept at 95%RH to further ensure the amount of water dew formation.

[0080] Specifically, the dust-containing test equipment can be placed in an environment with an ambient humidity of not less than 95% RH, and the ambient temperature can be adjusted by a range of not less than 50 degrees Celsius within 1.5 hours, and the highest temperature can be maintained for more than 1.5 hours, and the lowest temperature for more than 1.5 hours, in order to obtain the test equipment containing mud and water.

[0081] In some embodiments, step 200, which involves adjusting the ambient temperature of the dust-containing test device to form condensate inside the dust-containing test device to obtain a mud-water-containing test device, specifically involves:

[0082] The dust-containing test device is placed in an environment with a temperature maintained between 55 and 65 degrees Celsius and a humidity maintained between 92% and 98% RH for 2.5 to 3.5 hours.

[0083] The ambient temperature of the dust-containing test device is cooled to 3 to 7 degrees Celsius within 2 hours, and then placed in the current temperature environment for 2.5 to 3.5 hours.

[0084] The ambient temperature of the dust-containing test device is raised to 55 to 65 degrees Celsius within 2 hours, and then placed in the current temperature environment for 2.5 to 3.5 hours to obtain the mud-containing test device.

[0085] The above steps can be repeated to ensure that enough condensate is formed.

[0086] In some embodiments, such as Figure 2 As shown, step 200, which involves adjusting the ambient temperature of the dust-containing test device to form condensation inside the dust-containing test device to obtain a mud-containing water test device, specifically includes:

[0087] Step 210: Place the dust-containing test device in an environment with a temperature maintained at 60 degrees Celsius and a humidity maintained at 95% RH for 3 hours;

[0088] Step 220: Cool the ambient temperature of the dust-containing test device to 5 degrees Celsius within 1.5 hours, maintain the ambient humidity at 95%RH, and place it in the current temperature environment for 3 hours;

[0089] Step 230: Increase the ambient temperature of the dust-containing test device to 60 degrees Celsius within 1.5 hours, maintain the ambient humidity at 95% RH, and place it in the current temperature environment for 3 hours to obtain the mud-containing test device.

[0090] The above steps can be repeated to ensure that enough condensate is formed.

[0091] In some embodiments, step 300: drying the muddy water testing device to obtain a flocculent testing device, including:

[0092] Step 310: Place the mud-containing water test device in an environment with a humidity of 0%RH for 2.5 to 3.5 hours to form a granulated test device.

[0093] That is, by reducing the ambient humidity to provide a very dry environment, the purpose of drying can be achieved.

[0094] Specifically, the test equipment containing muddy water can be placed in an environment with a humidity of 0% RH for 3 hours to form a granulated test equipment.

[0095] Of course, if the ambient humidity cannot be reduced to 0% RH, the drying time can be extended to ensure the formation of flakes.

[0096] Alternatively, the ambient temperature can be increased to help accelerate the formation of flocs through hot air.

[0097] During the drying process, the mud gradually loses water and clumps together, adhering to the surface of the device and the PCB (circuit board) of the equipment being tested.

[0098] In some embodiments, the dust falling in the dust-falling environment comprises one or both of metal dust and graphite powder.

[0099] Both metal dust (copper powder, 3000 mesh) and graphite powder (3000 mesh) are conductive dusts, with metal dust having a stronger conductivity. However, metal dust may undergo partial oxidation when in contact with water or air, resulting in a weakening of its conductivity. Graphite powder, on the other hand, has better inertness but weaker conductivity, so the improvement in conductivity is not significant.

[0100] In some embodiments, the dust falling in the dust-falling environment may contain both metal dust and graphite powder.

[0101] In some embodiments, the dust falling in the dust-bearing environment may include ash, salt, metal dust, and graphite. The ash may be kaolin, diatomaceous earth, etc., and the salt may be a sodium salt, such as sodium chloride (NaCl).

[0102] In some embodiments, the dust that may fall in the dust-falling environment may include one, two, or three of the following: ash, salt, metal dust, and graphite.

[0103] In some embodiments, when the device under test is applied to areas where conductive dust accounts for a large proportion of the dust in the application environment (such as metal mining sites, metal smelting, and other application scenarios with a large amount of metal dust), the mixed dust configuration ratio range is: 89% to 96% kaolin, 2% to 3% graphite powder, 2% to 3% metal powder, and 0% to 5% NaCl (by weight).

[0104] In some embodiments, when the device under test is applied in areas with high levels of corrosive substances in the dust (e.g., coastal areas, saline-alkali land, etc.), the mixed dust configuration ratio ranges as follows: kaolin 88%–94%, graphite powder 1%–2%, and NaCl 5%–10%.

[0105] In some embodiments, when the tested equipment is applied in an area where the proportion of various types of dust in the application environment is relatively uniform (e.g., in urban and rural suburbs, or construction sites), the mixed dust configuration ratio ranges as follows: kaolin 91%–100%, graphite powder 0%–2%, metal powder 0%–2%, and NaCl 0%–5%.

[0106] In some embodiments, after various dusts are mixed according to a set ratio, they need to be stirred in a mixing zone. Then, a specific amount of the mixed dust is placed into the inlet of the dust settling environment. Preferably, the mixing zone uses a stirring mechanism to stir the mixture for a set time to ensure thorough mixing.

[0107] By using the above proportions, the dust-falling environment under natural conditions can be simulated, making the testing environment closer to the product's usage environment. This allows for the testing of the environmental adaptability of the tested equipment, effectively detecting abnormalities such as short circuits, high-temperature failures, equipment explosions, and circuit corrosion, thereby improving the accuracy of testing quality and ultimately enhancing product reliability.

[0108] In some embodiments, the combined tests employed in step 400 include one, multiple, or all of the following tests: high temperature and high humidity operation test, condensation operation test, alternating damp heat operation test, constant damp heat storage, and temperature shock test. It should be noted that after obtaining the device under test containing flakes, the flakes are generally very fine, but the adhesion is relatively strong, so overall they can still be considered as dust.

[0109] In some embodiments, the high temperature and high humidity operation test mainly includes the following steps:

[0110] The ambient temperature of the device under test containing the agglomerate is maintained at 55°C and the humidity is maintained at 98%RH for 30 minutes; then the device under test is run under load for 10 hours, and then the device under test is powered off and shut down for 14 hours. This is one cycle, and a total of 15 cycles can be performed to make the total load time of the device under test 150 hours.

[0111] Then steps 100-400 can be executed further, specifically in three cycles. After each execution of step 400, the device under test containing the agglomerate can be used as the device under test in step 100.

[0112] After repeating steps 100 to 400 three times, remove the device under test and check its performance status. This simulates the condition after approximately three years of operation. Whether it is functioning correctly can be determined by comparing its performance parameters with those of the device under test under normal conditions.

[0113] The temperature fluctuation range during the condensation test is generally no more than 30 degrees Celsius, and the temperature change is slow, generally no more than 15 degrees Celsius per hour.

[0114] In some embodiments, before adjusting the ambient temperature of the dust-containing test device, the method further includes:

[0115] Step 500: Push the dust-containing test device out of the dust-falling environment and into a temperature and humidity controllable environment.

[0116] That is, step 500 is set between step 100 and step 200 to form two working environments, one of which is a dust settling environment and the other is a temperature and humidity controllable environment.

[0117] In a dusty environment, perform step 100; while in a temperature and humidity controlled environment, perform steps 200, 300, and 400.

[0118] The temperature and humidity controllable environment includes a temperature control module 21 and a humidity control module. The temperature control module 21 generally includes a heating module and a cooling module to regulate the temperature in the current environment, while the humidity control module regulates the humidity in the current environment. When making large-scale adjustments to the temperature and humidity, a fan can be added to the temperature and humidity control environment to accelerate the air flow in the internal environment, so as to make the temperature and humidity uniform throughout the interior.

[0119] The temperature and humidity controlled environment and the dust settling environment are separated by openable doors 10, such as roller shutters or double doors. To facilitate movement between the two environments, tracks 4 can be installed for sliding. Furthermore, a drive mechanism, such as a walking mechanism or a pushing mechanism, can be provided to move the platform holding the tested equipment between the temperature and humidity controlled environment and the dust settling environment.

[0120] In some embodiments, step 100, which involves placing the device under test in a dusty environment to obtain a dusty device under test, may specifically include:

[0121] Step 110: Mix the various dusts according to the preset ratio to obtain mixed dust.

[0122] The mixing method can be as described in the above embodiments. When mixing, the mixture is generally stirred in the stirring zone 8 to ensure uniform mixing and thus obtain better mixed dust.

[0123] Step 120: Blow the mixed dust upwards at an angle to allow the dust to settle naturally, and then let it stand for a first preset time to allow the environmental particle concentration to meet the requirements.

[0124] This allows for the simulation of dust settling patterns under natural environmental conditions based on dustfall parameters. Specifically, an upward-sloping inlet pipe can be used, with the pipe opening tilted upwards. Under the influence of wind, dust flows upwards along the inlet pipe until it is ejected from the upward-sloping opening. After being ejected, it suspends in the air and naturally settles under the influence of gravity. The environmental particulate concentration can be either PM2.5 or PM10. PM2.5 refers to fine particulate matter, while PM10 refers to inhalable particulate matter, typically referring to particles with a diameter of less than 10 micrometers.

[0125] Let it stand for the first preset time until the PM2.5 and PM10 levels in the environment reach the preset values ​​after the dust settles.

[0126] Step 130: After the fan blows air horizontally for a second preset time, stop blowing to allow the air to enter the device under test.

[0127] The fan can be a fan inside the device under test or a fan set up separately outside the device under test. The fan accelerates the lateral flow of the air so that the air containing particulate matter outside the device under test can enter the device under test.

[0128] Step 140: After a third preset time of stillness, the tested device containing dust is formed.

[0129] After step 130, a particulate-containing airflow enters the device under test. The particulate matter begins to descend, adhering to the interior of the device after settling inside. This forms the dusty device under test required for subsequent steps.

[0130] In some embodiments, when performing step 400, the possibility of device damage may be further considered. Specifically, a combined test may be performed on the device under test containing agglomerates, including:

[0131] If an abnormality occurs in the device under test containing agglomerates during the combined test, the test shall be stopped.

[0132] The system determines whether the current device is repairable. If it is repairable, repairs are performed, and testing continues. Alternatively, some experimental parameters in the combined test can be changed individually or in combination to determine the actual performance of the device under test.

[0133] If the current equipment is determined to be unrepairable, it is necessary to replace the current equipment under test (including the substrate bonding equipment) and repeat the experiment.

[0134] It should be noted that whether the tested equipment is malfunctioning can be determined by comparing its performance parameters with those of the equipment under test. For example, changes in output current and voltage, and whether the internal fan speed meets normal requirements.

[0135] If an abnormality occurs in the device under test (DUT) during a combined test, the power should be immediately cut off, the test stopped, and the cause of the abnormality analyzed. If the DUT is not damaged and can be repaired and improved, it can continue to be used. Subsequent tests should use the repairable DUT, and the test times can be accumulated. Whether it is repairable depends on the specific structure of the DUT.

[0136] If the tested equipment suffers irreparable damage or failure during the test, a new tested equipment should be used to perform the dust removal and agglomeration process according to steps 100 to 300, and then a wet dust test should be conducted, with the test time recalculated.

[0137] After conducting the above combined tests, the device under test is removed, the casing is opened, and thick dust deposits are observed on the electrical components of the circuit board. At this point, the actual working status data of the device is collected and compared with the standard data of normal operation to verify whether the device under test can work normally.

[0138] In some embodiments, between step 300 and step 400, the method further includes performing a simple power-on test on the device under test containing agglomerates at room temperature to confirm whether the functional state of the device under test after agglomeration meets the requirements, and then proceeding to step 400 after the requirements are met. This ensures the effectiveness of subsequent combined tests.

[0139] In some embodiments, a wet dust testing device is provided, mainly used for the wet dust testing methods of the above embodiments. Specifically, the wet dust testing device mainly includes a dust blowing area 1, a temperature and humidity controllable area 2, and a support platform 3.

[0140] The dust blowing zone 1 can create a dust settling environment, and the specific method of formation can be set as needed. For example, it can be achieved through a spraying mechanism, a dust-raising mechanism, etc., mainly for performing the above step 100.

[0141] The temperature and humidity controllable zone 2 includes a temperature control module 21 for adjusting the temperature of the temperature and humidity controllable zone 2 and a humidity control module for adjusting the humidity of the temperature and humidity controllable zone 2, so that a temperature and humidity controllable environment is formed inside the temperature and humidity controllable zone 2 for performing the above steps 200 to 400.

[0142] The support platform 3 supports the device under test and can move between the dust blowing area 1 and the temperature and humidity controllable area 2, i.e., perform the above step 500. A track 4 can be provided between the dust blowing area 1 and the temperature and humidity controllable area 2 to support the support platform 3, facilitating its sliding between the two areas. Furthermore, a drive mechanism, such as a walking mechanism or a pushing mechanism, can be provided to move the support platform containing the device under test between the dust blowing area 1 and the temperature and humidity controllable area 2. Furthermore, an openable door 10, such as a roller shutter door or a double door, can be provided between the dust blowing area 1 and the temperature and humidity controllable area.

[0143] The temperature control module 21 preferably has an adjustment range of no less than 50 degrees Celsius to ensure that agglomeration can be carried out. Similarly, the temperature and humidity controllable zone 2 should also have sufficient drying capacity, which can be achieved by controlling the humidity of the entire temperature and humidity controllable zone 2 through the humidity control module. For example, the humidity control module can achieve 0% RH in the temperature and humidity controllable zone 2.

[0144] This wet dust testing equipment is mainly used for the aforementioned wet dust testing methods, so its technical effect can be referenced from the aforementioned wet dust testing methods.

[0145] In some embodiments, the wet dust testing equipment may further be provided with a control device 5, which is connected to the drive mechanism of the support platform, the humidity control module and the temperature control module, wherein the control device 5 performs control steps according to the wet dust testing method described in any embodiment.

[0146] Specifically, the control device 5 is connected to the temperature control module 21, the humidity control module, the drive mechanism for moving the support platform 3, the dust-collecting device for dust collection in the dust-blowing area 1, and the connection terminal for connecting the device under test, so as to control the corresponding parts to start according to any of the above-mentioned method steps. The connection terminal can be the power terminal 9. The control device can also be connected to the temperature and humidity sensor 22 and the particulate matter concentration sensor 7 to receive sensor detection signals.

[0147] For example, control device 5 can be executed according to the following steps:

[0148] The dust collection device in the dust-falling environment is activated and then shut down after a first preset duration; or, the dust collection device in the dust-falling environment is activated and then shut down when the particle concentration sensor 7 in the dust blowing zone 1 detects that the value meets the requirements.

[0149] The fan in the dust blowing zone 1 is controlled to start, and after a second preset time, the fan is controlled to stop. The fan can be a standalone fan, or it can be activated by powering on the control connection terminal to start the fan within the device under test.

[0150] After a third preset time period, the door 10 between the dust blowing zone 1 and the temperature and humidity controllable zone 2 is opened, and the drive mechanism is activated to drive the carrying platform 3 into the temperature and humidity controllable zone 2. Then, the door 10 between the dust blowing zone 1 and the temperature and humidity controllable zone 2 is closed.

[0151] The temperature control module 21 and humidity control module are started to work, and the transmission signals from the temperature and humidity sensor 22 are received in real time. The control is performed according to the set working requirements, especially the temperature and humidity requirements, to first acquire the above-mentioned muddy water test equipment, and then acquire the agglomerated sheet test equipment. The specific conditions are as described in steps 210 to 230 and step 310 above.

[0152] The temperature control module 21 and humidity control module are controlled to start working to conduct combined tests and receive the transmission signals from the temperature and humidity sensor 22 in real time. The corresponding control is carried out according to the requirements of the combined test conditions, especially the temperature and humidity requirements.

[0153] In some embodiments, a first fan 6 for horizontally blowing air is provided in the dust blowing zone 1; a second fan for accelerating airflow is provided in the temperature and humidity controllable zone 2. During step 100, the control device 5 can control the first fan 6 to start and stop. During steps 200 to 400, the second fan can be controlled to start and stop. The first fan 6 is used to allow dust in the dust blowing zone 1 to enter the device under test, and is preferably a movable fan for easy alignment with the device. The second fan is used to accelerate the airflow in the temperature and humidity controllable zone 2 to ensure uniform temperature and humidity throughout.

[0154] In some embodiments, the dust distribution device may be a spraying mechanism or a dust-raising mechanism, and preferably also includes a stirring zone 8. The dust blowing zone 1 includes a collection hopper 11 located at the bottom, a circulation pump 12 whose inlet is connected to the outlet of the collection hopper 11, and a dust guide channel 13 connected at one end to the circulation pump 12. The outlet section of the dust guide channel 13 extends obliquely upward. The outlet of the stirring zone 8 and the middle of the dust guide channel 13 are connected by an obliquely downward communicating channel 14.

[0155] In some embodiments, the particulate matter concentration sensor 7 in the dust blowing zone 1 may include both a PM10 sensor and a PM2.5 sensor, or it may only include one of the PM10 sensor and the PM2.5 sensor. The particulate matter concentration sensor is mainly used to monitor the particulate matter concentration in the dust blowing zone to simulate a specific dust landing environment.

[0156] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0157] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for testing wet dust, characterized in that, Includes the following steps: The device under test is placed in a dusty environment to obtain dusty test equipment; The ambient temperature of the dust-containing test device is adjusted so that condensation forms inside the dust-containing test device to obtain a mud-containing water test device. The muddy water test equipment is dried to obtain a test equipment containing agglomerated flakes; A combined test was conducted on the device containing the agglomerated pieces; The step of adjusting the ambient temperature of the dust-containing test equipment to cause condensation to form inside the dust-containing test equipment, thereby obtaining a mud-containing water test equipment, includes: The ambient temperature of the dust-containing test equipment is adjusted, and the adjustment range is not less than 50 degrees Celsius within two hours, and the ambient humidity is not less than 85%RH, in order to obtain the mud-containing test equipment. The step of adjusting the ambient temperature of the dust-containing test equipment to cause condensation to form inside the dust-containing test equipment, thereby obtaining a mud-containing water test equipment, includes: The dust-containing test device is placed in an environment with a temperature maintained between 55 and 65 degrees Celsius and a humidity maintained between 92% and 98% RH for 2.5 to 3.5 hours. The ambient temperature of the dust-containing test device is cooled to 3 to 7 degrees Celsius within 2 hours, and then placed in the current temperature environment for 2.5 to 3.5 hours. The ambient temperature of the dust-containing test device is raised to 55 to 65 degrees Celsius within 2 hours, and placed in the current temperature environment for 2.5 to 3.5 hours to obtain the mud-containing test device. The device being tested, which contains muddy water, is dried to obtain a device being tested containing agglomerated flakes, comprising: The mud-containing water test device is placed in an environment with a humidity of 0%RH for 2.5 to 3.5 hours to form a granulated test device.

2. The wet dust testing method according to claim 1, characterized in that, The step of adjusting the ambient temperature of the dust-containing test equipment to cause condensation to form inside the dust-containing test equipment, thereby obtaining a mud-containing water test equipment, includes: The dust-containing test device was placed in an environment with a temperature maintained at 60 degrees Celsius and a humidity maintained at 95%RH for 3 hours; The ambient temperature of the dust-containing test device is reduced to 5 degrees Celsius within 1.5 hours, and the ambient humidity is maintained at 95%RH. The device is then placed in the current temperature environment for 3 hours. The ambient temperature of the dust-containing test device is raised to 60 degrees Celsius within 1.5 hours, and the ambient humidity is maintained at 95%RH. The device is then placed in the current temperature environment for 3 hours to obtain the mud-containing test device.

3. The wet dust testing method according to any one of claims 1-2, characterized in that, The dust falling in the dust settling environment includes at least one of metal dust and graphite powder.

4. The wet dust testing method according to any one of claims 1-2, characterized in that, The dust falling in the dust-falling environment includes ash, salt, metal dust, and graphite.

5. The wet dust testing method according to any one of claims 1-2, characterized in that, The combined test includes at least one of the following tests: high temperature and high humidity operation test, condensation operation test, alternating damp heat operation test, constant damp heat storage and temperature shock test.

6. The wet dust testing method according to any one of claims 1-2, characterized in that, Before adjusting the ambient temperature of the dust-containing test device, the following steps are included: The dust-laden test device is pushed out of the dust-falling environment and into a temperature and humidity-controlled environment.

7. The wet dust testing method according to any one of claims 1-2, characterized in that, The process of placing the device under test in a dusty environment to obtain dusty test equipment includes: Multiple dust particles are mixed in a preset ratio to obtain mixed dust. The mixed dust is blown upwards at an angle to allow the dust to settle naturally, and then left to stand for a first preset time to allow the environmental particle concentration to meet the requirements. After the fan blows air horizontally for a second preset time, the blowing stops to allow the air to enter the device under test. After a third preset period of stillness, the tested device becomes dusty.

8. The wet dust testing method according to any one of claims 1-2, characterized in that, The combined test on the device containing the agglomerates includes: If an abnormality occurs in the device under test containing agglomerates during the combined test, the test shall be stopped. Determine whether the device under test is repairable. If it is determined that the device is repairable, repair it and continue testing.

9. The wet dust testing method according to any one of claims 1-2, characterized in that, The combined test on the device containing the agglomerates includes: The device under test containing agglomerates is powered on and tested at room temperature. After determining that the functional status of the device under test containing agglomerates meets the requirements, a combined test is performed on the device under test containing agglomerates.

10. A wet dust testing device, characterized in that, The wet dust testing method according to any one of claims 1-9 includes: A dust blowing zone, which can create an environment for dust to fall; The temperature and humidity controllable zone includes a temperature control module for adjusting temperature and a humidity control module for adjusting humidity; the temperature control module has an adjustment range of not less than 50 degrees Celsius. A support platform is used to support the device under test and is movable between the dust blowing area and the temperature and humidity controllable area; a control device is connected to the drive mechanism of the support platform, the humidity control module and the temperature control module, and the control device is capable of performing control steps according to the wet dust testing method according to any one of claims 1-9.

11. The wet dust testing equipment according to claim 10, characterized in that, The dust blowing zone is equipped with a first fan for blowing air horizontally; the temperature and humidity controllable zone is equipped with a second fan for accelerating the airflow.

12. The wet dust testing equipment according to claim 11, characterized in that, It also includes a stirring zone, the dust blowing zone including a collection hopper at the bottom, a circulation pump whose inlet is connected to the outlet of the collection hopper, and a dust guide channel with one end connected to the circulation pump, the other end of the dust guide channel extending obliquely upward; the outlet of the stirring zone and the middle of the dust guide channel are connected by an obliquely downward connecting channel.

13. The wet dust testing equipment according to claim 12, characterized in that, The dust blowing area is equipped with PM10 and PM2.5 sensors.

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