A method and device for testing environmental tolerance of an electric discharger

Abstract

A method and device for testing the environmental tolerance of an electrostatic eliminator belongs to the field of electrostatic elimination. A closed test chamber is set up, and a set of three-directional sliding guide rails are installed inside the test chamber to determine the typical particulate matter and / or droplets in the environment. The test device is used to monitor the electrostatic elimination performance data of the electrostatic eliminator under different particle sizes and concentrations of the particulate matter and / or droplets specified in the test plan. A standard database for the environmental tolerance of the electrostatic eliminator is established. Based on the characteristics of the application industry and the corresponding electrostatic protection requirements, the applicable electrostatic eliminator type, operating parameters, and electrostatic elimination performance alarm threshold in the corresponding environment are determined with reference to the standard test data. Based on the alarm threshold, the cleaning and maintenance cycle of the electrostatic eliminator under different particle sizes and concentrations of the particulate matter and / or droplets is determined. By testing the stability of the electrostatic elimination performance under different operating parameters, the optimal operating parameters and maintenance plan under the environmental conditions are determined. The device can be widely used in the design and manufacturing of active electrostatic eliminators.

Description

Technical Field

[0001] The invention belongs to the field of active static elimination, and in particular relates to a test method for testing the environmental tolerance of a static elimination device. Background Art

[0002] Static eliminators are widely used in various industrial sectors such as electronics, optoelectronics, thin films, machinery / equipment manufacturing, electrical manufacturing, printing, and food processing. This results in a very complex operating environment, such as relatively clean electronics workshops, printing / electrical manufacturing workshops with oil mist, and machinery / food processing workshops with dust.

[0003] Different environmental conditions have a significant impact on the static eliminator's performance. The same eliminator can exhibit significant differences in performance when used in different environments. For example, in a relatively clean electronics workshop, the eliminator's performance can remain stable for a relatively long time. However, in a printing or electrical manufacturing workshop exposed to oil mist, or a machinery or food processing workshop exposed to dust, the eliminator's performance may decline significantly within a few to ten hours.

[0004] For example, in the electronics industry, dissipators are typically placed in an electronic cleanroom (i.e., the application site), where their dissipation performance is manually monitored daily and maintenance is performed if performance degrades. In contrast, in printing / electrical manufacturing workshops or machinery / food processing workshops, dissipators are typically maintained and repaired only after product quality issues are discovered or when production operations are impacted. For example, when the discharge electrode of a dissipator is contaminated by ink droplets, its dissipation performance degrades, causing ink flying and degrading the quality of printed products. Alternatively, when the discharge electrode of a dissipator is contaminated by food powder, its dissipation performance degrades, leading to blockage of the discharge port and production disruptions.

[0005] Therefore, the existing test (application / use) scheme for the environmental tolerance performance of the discharge device cannot systematically and completely study the environmental tolerance performance of the discharge device, nor has it formed a quantitative response plan, and cannot be applied to complex usage environments.

[0006] The existing technical solutions have the following technical defects:

[0007] 1) There is no relatively systematic and complete quantitative response plan, there is no expected management of the use of electrical appliances, the maintenance cost is high, and it is easy to affect product quality.

[0008] 2) The environmental applicability of different types of eliminators was not considered, and their applicable environments were not classified, resulting in incorrect eliminator selection and poor customer experience.

[0009] Therefore, whether it is to study the environmental tolerance of the dissipator or to define the appropriate application environment for different types of dissipators, a set of test equipment and test methods are urgently needed to systematically study the environmental tolerance performance of the dissipator. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to provide a method and device for testing the environmental tolerance of a dissipator. The present invention provides a set of test devices and test methods for studying the environmental tolerance of dissipators, thereby forming a systematic, complete, and quantifiable dissipator maintenance plan.

[0011] The technical solution of the present invention is to provide a method for testing the environmental tolerance of a eliminator, which is characterized by:

[0012] a) A closed test chamber with three air inlet channels on the top is set up to form a closed test space for the directional flow of suspended particles and / or droplets, simulating the actual use environment of the eliminator;

[0013] b) An airflow equalizing plate is provided directly below the air inlet channel to simulate the actual suspended particle and / or droplet movement environment when the eliminator is operating;

[0014] c) A side wall vortex suppression guide layer is installed on the inner wall of the test chamber to prevent the airflow driven by the eliminator from hitting the side wall and forming more complex vortices, which will affect the test;

[0015] d) A bottom eddy current suppression and diversion layer is set at the bottom of the experimental chamber to prevent the discharge current from hitting the bottom plate to form eddy currents and affect the test of the flat panel tester;

[0016] e) Set up a set of XYZ sliding guide rails inside the test chamber to test the dissipation performance of the eliminator at different positions;

[0017] f) Install and fix the eliminator on the sliding guide rail in the Z direction to adjust the vertical test distance of the eliminator;

[0018] g) Determine the typical particles and / or droplets in the environment according to the customer's usage environment;

[0019] h) Develop a test plan and determine the particle size and concentration of test particles and / or droplets;

[0020] i) Use the test device to monitor the dissipation performance data of the dissipator under different particle sizes and concentrations of particles or / and droplets specified in the test plan, and establish a standard database for the environmental tolerance of the dissipator;

[0021] j) According to the characteristics of the application industry and the corresponding electrostatic protection requirements, refer to the standard test data to determine the applicable type of eliminator, operating parameters and eliminator performance alarm threshold in the corresponding environment;

[0022] k) Determine the cleaning and maintenance cycle of the eliminator under different particle sizes and concentrations of particulate matter and / or droplets based on the alarm threshold.

[0023] Specifically, the closed test chamber is a square closed test chamber.

[0024] Specifically, the air outlet of the suspended particle generator discharges a suspended particle airflow of a set concentration, and the air outlet of the atomization generator discharges a suspended liquid droplet airflow of a set concentration or a humidified airflow of a set humidity.

[0025] Furthermore, the airflow equalizing plate is a multi-layer perforated metal mesh plate with staggered layers spaced apart from each other, and is used to evenly distribute the suspended particles / droplets airflow in the test chamber.

[0026] Specifically, the dissipation performance of the dissipator is tested by a flat panel tester arranged at the bottom of the experimental cabin.

[0027] Furthermore, the flat panel tester is arranged on sliding guide rails in the XY directions and can move in the horizontal direction.

[0028] Furthermore, the electrical dissipator is arranged on a sliding guide rail in the Z direction and can move in the longitudinal direction.

[0029] The technical solution of the present invention further provides an environmental tolerance test device for a eliminator, which is characterized by:

[0030] Set up a closed test chamber;

[0031] There are three air intake channels on the top of the test chamber;

[0032] The three air inlet channels are respectively connected to the air outlet of the suspended particle generator, the air outlet of the atomizer generator and one of the air outlets of the air filter;

[0033] The air inlet of the air filter is connected to the dehumidifier; the other two air outlets of the air filter are connected to the air inlets of the suspended particle generator and the atomization generator respectively;

[0034] The external air is dried by the dehumidifier and enters the air filter for filtration. The filtered air is sent to the suspended particle generator and the atomizer respectively, and is also sent to the square closed test chamber through one air intake channel. The filtered air sent to the suspended particle generator and the atomizer respectively passes through the suspended particle generator and the atomizer generator, and then enters the square closed test chamber through the remaining two air intake channels.

[0035] An airflow balancing plate is installed directly below the three air inlet channels of the closed test chamber;

[0036] Below the airflow balancing plate, a temperature and humidity sensor and a particle concentration sensor are respectively provided;

[0037] The space below the air flow equalizing plate is used to test the electrical appliance to be tested;

[0038] Inside the sealed test chamber, mesh panels with holes are provided on the four inner walls. Solid panels without mesh holes are provided around the mesh panels to wrap the mesh panels, forming a hollow interlayer.

[0039] A mesh plate with holes is set at the bottom of the closed test chamber, and a funnel-shaped solid plate without mesh holes is wrapped around the bottom of the mesh plate to form a funnel-shaped hollow sandwich;

[0040] The air outlet of the funnel-shaped solid plate is connected to the outlet filter;

[0041] The air outlet of the filter is connected to the second dehumidifier;

[0042] Two vertical Z-direction sliding guide rails are arranged in parallel on the inner wall of the closed test chamber. A vertical slider is provided on each Z-direction sliding guide rail. A eliminator mounting bracket is fixed and installed between the two sliders.

[0043] The eliminator to be tested is fixed on the eliminator mounting bracket;

[0044] A set of XY direction sliding guide rails is arranged on the bottom mesh plate of the closed test chamber, and a flat panel tester is installed on the sliders of the XY direction sliding guide rails.

[0045] Specifically, the closed test chamber is a square closed test chamber.

[0046] Furthermore, the airflow equalizing plate is a multi-layer perforated metal mesh plate with layers spaced apart and staggered.

[0047] Compared with the prior art, the advantages of the present invention are:

[0048] 1. The technical solution of the present invention relies on a test device to establish a standard database of the effects of powders / droplets with different physical properties at different particle sizes and concentrations on the performance and cleaning cycle of the electrical appliance;

[0049] 2. According to the use environment and standard database, the eliminator can be selected in advance and the working parameters of the eliminator can be adjusted / set to enhance the applicability and tolerance of the eliminator to the actual use environment;

[0050] 3. Based on the use environment and standard database, it can improve the predictability, accuracy and precision of customers' maintenance management of power consumption appliances, reduce unnecessary maintenance frequency, and effectively reduce maintenance management costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a schematic structural diagram of the environmental tolerance test device for the eliminator of the present invention;

[0052] Figure 2 Schematic diagram of the partial structure of the airflow equalizing plate of the present invention;

[0053] Figure 3 It is a block diagram of the environmental tolerance test method of the present invention for dissipating electrical appliances.

[0054] In the figure, 1 is a square closed test chamber, 2 is an air inlet channel, 3 is a suspended particle generator, 4 is an air filter, 5 is an atomizer, 6 is a first dehumidifier, 7 is an air flow balancing plate, 8 is a temperature and humidity sensor, 9 is a particle concentration sensor, 10 is a eliminator to be tested, 11 is a mesh plate with holes, 12 is a solid plate, 13 is a hollow interlayer, 14 is a mesh plate with holes, 15 is a funnel-shaped solid plate, 16 is a funnel-shaped hollow interlayer, 17 is an outlet filter, 18 is a second dehumidifier, 19 is a Z-direction sliding guide rail, 20 is a vertical slider, 21 is a eliminator mounting bracket, 22a and 22b are XY-direction sliding guide rails, and 23 is a flat panel tester. DETAILED DESCRIPTION

[0055] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0056] The technical solution of the present invention first sets up a test device for setting the environmental tolerance of the dissipator:

[0057] like Figure 1 As shown, a square, sealed test chamber 1 is provided with three air inlet channels 2 on the top of the chamber. These three inlet channels are respectively connected to the air outlets of a suspended particle generator 3, an atomizer 5, and one of the air outlets of an air filter 4. The air inlet of the air filter is connected to a dehumidifier 6, and the other two air outlets of the air filter are respectively connected to the air inlets of the suspended particle generator and the atomizer.

[0058] The external air is dried by the dehumidifier and enters the air filter for filtration. The filtered air is sent to the suspended particle generator and the atomizer generator respectively, and is also sent into the square closed test chamber through an air intake channel. The filtered air sent into the suspended particle generator and the atomizer generator passes through the suspended particle generator and the atomizer generator respectively, and then enters the square closed test chamber through the remaining two air intake channels.

[0059] An airflow balancing plate 7 is provided directly below the three air inlet channels of the square closed test chamber. Below the airflow balancing plate, a temperature and humidity sensor 8 and a particle concentration sensor 9 are provided respectively. The space below the airflow balancing plate is used for testing the electrical discharge device 10 to be tested.

[0060] Inside the square closed test chamber, mesh panels 11 with holes are provided on the four inner walls. Solid plates 12 without mesh holes are provided on the periphery of the mesh panels to wrap the mesh panels and form a hollow interlayer 13.

[0061] A mesh plate 14 with holes is provided at the bottom of the sealed test chamber, and a funnel-shaped solid plate 15 without mesh holes is wrapped around the bottom of the mesh plate to form a funnel-shaped hollow interlayer 16 .

[0062] The air outlet of the funnel-shaped solid plate is connected to the outlet filter 17 , and the air outlet of the filter is connected to the second dehumidifier 18 .

[0063] Two vertical Z-direction sliding guide rails 19 are arranged in parallel on the inner wall of the closed test chamber. A vertical slider 20 is provided on each Z-direction sliding guide rail. A eliminator mounting bracket 21 is fixed and installed between the two sliders. The eliminator 10 to be tested is fixed on the eliminator mounting bracket.

[0064] A set of XY direction sliding guide rails (indicated by 22a and 22b in the figure) is provided on the bottom mesh plate of the closed test chamber, and a flat panel tester 23 is installed on the sliders of the XY direction sliding guide rails.

[0065] Based on this test device, a systematic test method for environmental tolerance of electrical appliances and its use and maintenance plan can be formed:

[0066] 1. Set up a closed test chamber with three air inlet channels on the top;

[0067] 2. Set up an airflow balancing plate directly below the air inlet channel;

[0068] 3. Set up a side wall vortex suppression guide layer on the inner wall of the experimental cabin;

[0069] 4. Set up a bottom vortex suppression guide layer at the bottom of the experimental chamber;

[0070] 5. Set up a set of XYZ sliding guide rails inside the test chamber;

[0071] 6. Install and fix the electrical eliminator on the sliding guide rail in the Z direction;

[0072] 7. According to the use environment, determine the typical environmental particles and / or droplets (droplets) and make them enter the corresponding air flow channel;

[0073] 8. Determine the particle size and concentration of particles and / or droplets entering the test chamber;

[0074] 9. Use the test device to monitor the dissipation performance data of the eliminator under different particle sizes and concentrations of specified particles or / and droplets;

[0075] 10. Based on the application industry and its electrostatic protection requirements, as well as test data, determine the applicable type of eliminator, operating parameters and eliminator performance alarm threshold in the corresponding environment;

[0076] 11. According to the alarm threshold, determine the maintenance cycle of the eliminator under different particle sizes and concentrations of particulate matter and / or droplets.

[0077] The technical solution of the present invention is further described in detail below:

[0078] 1) If Figure 1 As shown, three air inlet channels are provided on the top of the square closed test chamber. All three air inlet channels are in the shape of an inverted funnel to facilitate the diffusion of airflow.

[0079] 2) The three air inlet channels are respectively connected to the air outlet of the suspended particle generator, the air outlet of the atomizer generator and one of the air outlets of the air filter.

[0080] The air outlet of the suspended particle generator discharges a suspended particle airflow of a set concentration, and the air outlet of the atomizing generator discharges a suspended liquid droplet airflow of a set concentration or a humidified airflow of a set humidity.

[0081] The air filter inlet is connected to a dehumidifier to ensure that dry and clean air flows into the test device. Its other two air outlets are connected to the air inlets of the suspended particle generator and the atomizer generator, respectively, to provide clean and dry air sources for both, so as to eliminate the influence of background particles / droplets on test errors.

[0082] 3) An air flow balancing plate is provided directly below the three air inlet channels. See the schematic diagram of its structure for details. Figure 2 As shown, the panel consists of multiple layers of perforated metal mesh arranged in staggered intervals. Its function is to evenly distribute the suspended particle / droplet airflow within the test chamber. This is because the surrounding airflow during operation of the eliminator forms a vortex, which creates a nearly uniform distribution of suspended particles / droplets. Temperature and humidity sensors and particle concentration sensors are located below the airflow equalization plate to monitor the temperature, humidity, and concentration of the suspended particle / droplet airflow entering the test chamber. The space below the equalization plate is used for testing the eliminator.

[0083] 4) The inner walls of the closed test chamber are provided with mesh panels with holes, and solid panels without holes are provided around the mesh panels to wrap the mesh panels, forming a hollow sandwich. The purpose of this arrangement is that when the airflow (of a vortex nature) driven by the eliminator moves to the mesh panels, it enters the sandwich between the mesh panels and the solid panels, preventing the airflow from hitting the side walls to form more complex vortices that affect the test.

[0084] 5) A perforated mesh panel is installed at the bottom of the sealed test chamber. A funnel-shaped solid plate without holes is wrapped around the bottom of the mesh panel, forming a funnel-shaped hollow sandwich. This arrangement allows the airflow driven by the eliminator to enter the funnel-shaped sandwich between the mesh panel and the solid plate, preventing the airflow from striking the bottom plate and forming vortices that could affect the flat panel tester's testing. The air outlet of the funnel-shaped solid plate is connected to a filter to remove suspended particles and droplets from the airflow. The air outlet of the filter is connected to a dehumidifier to dehumidify the sealed test chamber and regulate the humidity within the test chamber.

[0085] 6) Two parallel vertical (Z-direction, i.e., height) sliding guides are installed on the inner wall of the sealed test chamber. A charge eliminator mounting bracket is mounted on the guide rail sliders. The charge eliminator to be tested is fixed to the charge eliminator mounting brackets to adjust the charge eliminator's operating (test) distance. XY-direction sliding guides are installed on the bottom mesh panel of the sealed test chamber. A flatbed tester is mounted on the guide rail sliders to test the charge eliminator's horizontal charge dissipation capability.

[0086] 7) Using the above test device, a systematic test method for the environmental tolerance of the eliminator can be formed, a standard database can be established, and based on the standard database, the use and maintenance plan of the eliminator can be formulated:

[0087] a) Set up a closed test chamber with three air inlet channels on the top to form a closed test space for the directional flow of suspended particles and / or droplets, simulating the actual use environment of electrical appliances, such as electronic and pharmaceutical clean rooms;

[0088] b) An airflow equalizing plate is provided directly below the air inlet passage. Since the airflow around the eliminator is in a vortex state when the eliminator is working, the suspended particles and / or droplets will be approximately evenly distributed. Therefore, the equalizing plate will evenly distribute the suspended particles and / or droplet airflow in the test chamber, which well simulates the actual suspended particle and / or droplet movement environment when the eliminator is working;

[0089] c) A side wall vortex suppression and deflection layer is installed on the inner wall of the test chamber to prevent the airflow (vortex in nature) driven by the eliminator from hitting the side wall and forming more complex vortices that affect the test;

[0090] d) A bottom eddy current suppression and diversion layer is set at the bottom of the experimental chamber to prevent the discharge current from hitting the bottom plate to form eddy currents and affect the test of the flat panel tester;

[0091] e) Set up a sliding guide rail in the XYZ direction inside the test chamber to test the dissipation performance of the eliminator at different positions;

[0092] f) Install and fix the eliminator on the sliding guide rail in the Z direction to adjust the vertical test distance of the eliminator;

[0093] g) Determine the typical particles and / or droplets (liquid droplets) in the environment according to the customer's use environment:

[0094] For example, the silicides and ammonium salts in electronic cleanrooms, the ink droplets in printing workshops, and the metal dust in machining workshops;

[0095] h) Develop a test plan and determine the particle size and concentration of test particles and / or droplets;

[0096] i) Use the test device to monitor the dissipation performance data of the dissipator under different particle sizes and concentrations of particles or / and droplets specified in the test plan, and establish a standard database for the environmental tolerance of the dissipator;

[0097] j) According to the characteristics of the application industry and the corresponding electrostatic protection requirements, refer to the standard test data to determine the applicable type of eliminator, operating parameters and eliminator performance alarm threshold in the corresponding environment;

[0098] k) Determine the cleaning and maintenance cycle of the eliminator under different particle sizes and concentrations of particulate matter and / or droplets based on the alarm threshold.

[0099] Example:

[0100] In the cleanroom of the electronics industry, according to the industry's anti-static requirements, the eliminator must eliminate static electricity within 20 seconds, and the ion balance voltage must not exceed │±35V│. For example, ammonium chloride, a typical particle in the electronic cleanroom, is used as the test particle, with a particle size of 0.1μm. The particle concentration in the test chamber is set at 0.1g / m 3 , the temperature and humidity of the test chamber are maintained at 23±3℃, 50±5%RH, and a continuous discharge test is carried out on the discharger.

[0101] When either the de-charge time or the ion balance voltage exceeds the alarm threshold, the continuous monitoring time under the above conditions will be locked, which is the cleaning maintenance cycle.

[0102] In this way, the same test can be performed on different types of electrical eliminators to obtain their respective cleaning and maintenance cycles. After comparison, it can be inferred which type of electrical eliminator is more suitable for the use environment of the above-mentioned electronic clean room.

[0103] Under the above test environment conditions, the working parameters of the dissipator can also be adjusted, such as increasing or decreasing the working voltage, increasing or decreasing the working frequency, etc., to test the stability of the dissipation performance under different working parameters and determine the optimal working parameters under the environmental conditions.

[0104] The following table is an example of the environmental tolerance standard database for eliminators:

[0105]

[0106]

[0107] The technical solution of the present invention provides a set of test equipment and test methods for studying the environmental tolerance of the eliminator. By simulating the use environment of the eliminator and the eliminator effect under different environments, different types of eliminators can be tested to obtain their respective cleaning and maintenance cycles. After comparison, it can be inferred which type of eliminator is more suitable for the use environment of the above-mentioned electronic cleanroom; the working parameters of the eliminator can also be adjusted under different test environment conditions (such as increasing or decreasing the working voltage, increasing or decreasing the working frequency, etc.), and the stability of the eliminator performance under different working parameters can be tested, and then the optimal working parameters under the environmental conditions can be determined to form a systematic, complete, and quantifiable executable eliminator use and maintenance plan.

[0108] The present invention can be widely used in the fields of design, manufacture and on-site debugging of active static elimination devices.

Claims

1. A method for testing the environmental tolerance of an electric device, characterized by: a) A sealed test chamber with three air inlet channels on the top is provided to form a closed test space for the directional flow of suspended particles and / or droplets, simulating the actual use environment of the eliminator; the three air inlet channels are respectively connected to the air outlet of the suspended particle generator, the atomizer generator, and one of the air outlets of the air filter; b) An air flow equalizing plate is provided directly below the air inlet channel to simulate the actual suspended particle and / or droplet movement environment when the eliminator is working; c) A side wall vortex suppression guide layer is installed on the inner wall of the test chamber to prevent the airflow driven by the eliminator from hitting the side wall and forming more complex vortices, which will affect the test; d) A bottom eddy current suppression and diversion layer is installed at the bottom of the test chamber to prevent the discharge current from hitting the bottom plate to form eddy currents that affect the test of the flat panel tester; e) Set up a set of XYZ sliding guide rails inside the test chamber to test the dissipation performance of the eliminator at different positions; f) Install and fix the eliminator on the sliding guide rail in the Z direction to adjust the vertical test distance of the eliminator; g) Determine the typical particles and / or droplets in the environment according to the customer's usage environment; h) Develop a test plan and determine the particle size and concentration of test particles and / or droplets; i) Use the test device to monitor the dissipation performance data of the dissipator under different particle sizes and concentrations of particles or / and droplets specified in the test plan, and establish a standard database for the environmental tolerance of the dissipator; j) According to the characteristics of the application industry and the corresponding electrostatic protection requirements, refer to the standard test data to determine the applicable type of eliminator, operating parameters and eliminator performance alarm threshold in the corresponding environment; k) Determine the cleaning and maintenance cycle of the eliminator under different particle sizes and concentrations of particulate matter and / or droplets based on the alarm threshold.

2. The environmental tolerance test method for dissipating electrical appliances according to claim 1, characterized in that The airtight test chamber is a square airtight test chamber.

3. The environmental tolerance test method for dissipating electrical appliances according to claim 1, characterized in that The air outlet of the suspended particle generator discharges a suspended particle airflow of a set concentration, and the air outlet of the atomization generator discharges a suspended liquid droplet airflow of a set concentration or a humidified airflow of a set humidity.

4. The environmental tolerance test method for dissipating electrical appliances according to claim 1, characterized in that The airflow equalizing plate is a multi-layer perforated metal mesh plate with staggered layers spaced apart from each other, and is used to evenly distribute the suspended particles / droplets in the test chamber.

5. The environmental tolerance test method for dissipating electrical appliances according to claim 1, characterized in that The dissipation performance of the dissipator is tested by a flat panel tester arranged at the bottom of the test chamber.

6. The environmental tolerance test method for dissipating electrical appliances according to claim 5, characterized in that The flat panel tester is arranged on sliding guide rails in the XY directions and can move in the horizontal direction.

7. The environmental tolerance test method for dissipating electrical appliances according to claim 1, characterized in that The electrical dissipator is arranged on a sliding guide rail in the Z direction and can move in the longitudinal direction.

8. A device for testing environmental tolerance of an electric eliminator, characterized by: Set up a closed test chamber; There are three air intake channels on the top of the test chamber; The three air inlet channels are respectively connected to the air outlet of the suspended particle generator, the air outlet of the atomizer generator and one of the air outlets of the air filter; The air inlet of the air filter is connected to the dehumidifier; the other two air outlets of the air filter are connected to the air inlets of the suspended particle generator and the atomization generator respectively; The external air is dried by the dehumidifier and enters the air filter for filtration. The filtered air is sent to the suspended particle generator and the atomizer respectively, and is also sent to the square closed test chamber through one air intake channel. The filtered air sent to the suspended particle generator and the atomizer respectively passes through the suspended particle generator and the atomizer generator, and then enters the square closed test chamber through the remaining two air intake channels. An airflow balancing plate is installed directly below the three air inlet channels of the closed test chamber; Below the airflow balancing plate, a temperature and humidity sensor and a particle concentration sensor are respectively provided; The space below the air flow equalizing plate is used to test the electrical appliance to be tested; Inside the sealed test chamber, mesh panels with holes are provided on the four inner walls. Solid panels without mesh holes are provided around the mesh panels to wrap the mesh panels, forming a hollow interlayer. A mesh plate with holes is set at the bottom of the closed test chamber, and a funnel-shaped solid plate without mesh holes is wrapped around the bottom of the mesh plate to form a funnel-shaped hollow sandwich; The air outlet of the funnel-shaped solid plate is connected to the outlet filter; The air outlet of the filter is connected to the second dehumidifier; Two vertical Z-direction sliding guide rails are arranged in parallel on the inner wall of the closed test chamber. A vertical slider is arranged on each Z-direction sliding guide rail. A eliminator mounting bracket is fixedly installed between the two sliders. The eliminator to be tested is fixed on the eliminator mounting bracket; A set of XY direction sliding guide rails is provided on the bottom mesh plate of the closed test chamber, and a flat plate tester is installed on the slider of the XY direction sliding guide rails; The airflow equalizing plate is a multi-layer perforated metal mesh plate with mutually spaced layers staggered.

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