The placement and requirements of the test workpiece in the dustproof test box
The placement and requirements of the dustproof test chamber for the test workpiece strong> Dust Chamber The test piece is exposed to a vertical rather than laminar airflow containing a certain amount of dust. To do this, the test dust must be stirred and blown into the sealed test chamber. If specified in the relevant specifications, the sample should be connected to a vacuum pump for pumping so that the gas in the dust chamber can enter the sample through crevices, casings or other similar parts. The pressure drop must be adjustable and controlled and the pump speed must be measured. The dustproof test chamber is based on the operating conditions of the samples. Sample housings can be divided into two types: Type 1: The pressure inside the sample housing may differ from the atmospheric pressure outside, atexample due to a thermal cycle in operation. For samples with type 1 housings, place them in the test chamber, install them in the normal use position, and connect the vacuum pump to make the internal pressure of the samples lower than atmospheric pressure. For this purpose, a suitable hole must be made in the housing and, if a drain hole has already been made in the sample wall, the vacuum line must be connected to this hole without re-drilling. If there is more than one drain hole, the vacuum hose should be connected to one of the holes and the other holes sealed during the test. Type 2: The air pressure in the sample room is equal to the outside air pressure. Place samples with Type 2 housings in the test chamber and install them in the normal operating position. All open pores remain open. The dustproof test chamber has the requirements and solutions for the placement of test pieces, and Nanjing Enviro's technical expertsnmental Technology will list them for you one by one: 1. The volume of the sample should not exceed 25% of the volume of the test chamber. The sample base should not exceed 50% of the horizontal area of the working space of the chamber. 2. If the sample size does not meet the previous article, the relevant specifications should determine the following methods: 1. Test only the sealing part of the sample
Score; 2. Representative areas of the test sample, including components such as doors, vents, supports, seal shafts, etc., during the test. The fine parts containing the product, such as terminals, collector coils, etc. must remain in place; 3. Test a small sample with the same design details as the original sample.