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What are the principles and appearance requirements for the dimensions of air filters?
What are the principles and appearance requirements for the dimensions of air filters?Answer: The principles for expressing the dimensions of air filters are: the depth is the direction of airflow, the height is the vertical length when the vertical plane of the direction of airflow is correctly installed, and the width is the horizontal length.How are air filters classified by performance (type, filter material replacement method)? Answer: According to the type, they are classified into flat type, pleated type, bag type, and winding type; according to the filter material replacement method, they are classified into washable, cleanable, and disposable. The principles and basis for customers to judge whether air filters (primary, medium, and high-efficiency filters) are qualified? Answer: For a sample, if one of the main items or two of the other items in the inspection items are unqualified, the sample is unqualified; If one sample fails to pass the inspection when sampling, double the sampling. If there is still one unqualified, the batch of filters is unqualified; If more than 3 (including 3) filters have the same defect, the entire batch of products is also unqualified. What issues should be paid attention to during the labeling, packaging, and transportation of air filters? Answer: Label: Each filter must be marked in an obvious position. If necessary, the airflow direction should also be indicated. The marked content should at least include the product name, filter model specifications, efficiency at rated air volume, initial resistance, manufacturer name, and product production date. Packaging: The packaging should be able to protect the filter that has passed the factory inspection from damage caused by external factors during loading and unloading, transportation, handling, and storage until the user installs it. Before packaging, the filter should be placed in a plastic bag and protected with a hard board of the same size as the end face at both ends. Transportation: During the transportation of the filter, it should be placed according to the mark on the package, and fixed measures should be taken to stack the height to avoid crushing. Determination of the counting efficiency of atmospheric dust particle size grouping? Answer: Underrated air volume, two dust particle counters are generally used to simultaneously measure the particle count concentration of particles greater than or equal to 0.5um, greater than or equal to 1.0um, greater than or equal to 3.0um, and greater than or equal to 5um in the air on the upper and lower wind sides of the test filter to group them. What are the conditions of temperature, humidity, and pressure insertion during clean room testing? Answer: The temperature and relative humidity of the clean room area should be consistent with its production process requirements. The temperature is controlled between 18°C and 24°C. Its relative humidity is 45%~%; the pressure difference is generally a relatively positive pressure, and the pressure difference between clean rooms with different air cleanliness should be ≤4.9Pa. How about the fan of the duct system (fan, air pressure, resistance of the air inlet filter)? Answer: The air volume of the duct system fan is generally calculated by 1.3 times the test air volume of the tested filter; the resistance of the duct is generally calculated by 1.2 times the calculated resistance, and the resistance of the air inlet filter is calculated by 2 times the initial resistance; the rated air volume and wind speed of the tested filter must be ensured to ensure that the installation frame of the tested filter leaks, otherwise it will affect the accuracy of the data. What units are used for the wind speed, resistance, rated air volume, initial resistance, final resistance, and filtration efficiency of the air filter? Answer: The wind speed of the air filter is expressed in "m/s", the air volume is expressed in "m/h3", the resistance, initial resistance, and final resistance are expressed in "Pa", the filtration efficiency is expressed in "%MPPS", and the dust particles are expressed in microns. What negative impact does a small leakage of filter paper have on the air filter? Answer: The filter paper has fluff and damage, causing small leakage, which will seriously affect the filtration efficiency of the filter and the quality of the airflow, bringing unnecessary troubles and burdens to the production workshop, clean bench, and clean room, and hindering the entire production process. |
