Editor's note: The constant temperature and humidity test box is also called constant temperature and humidity test machine, constant temperature and humidity test box, constant temperature machine or constant temperature and humidity box. It is used to test the performance of materials in various environments and test the heat resistance of various materials Cold resistance, dry resistance, moisture resistance. This article introduces the structure and volume selection of the constant temperature and humidity box.
The overall structure of the constant temperature and humidity box: the refrigeration system is in the lower part of the rear of the box, and the control system is in the upper part of the constant temperature and humidity box. Heater, refrigeration evaporator, fan blade and other devices are distributed in the air duct interlayer at one end of the working room. The left side of the constant temperature and humidity box is equipped with a Ф50 cable hole, and the box door is a stainless steel embedded door handle with a single door. Adopt double high temperature resistant and anti-aging silicone rubber seal, which can effectively ensure the temperature loss of the test chamber.
The door of the constant temperature and humidity box is equipped with an observation window and a dirty anti-frost device that can be switched on and off. The observation window is made of multi-layer hollow tempered glass, and the inner side of the laminated conductive film is heated to defrost. The imported lamps are used for the lighting lamps, which can effectively observe the changes of the test samples in the working room in all aspects.
Selection of the volume of the constant temperature constant box: When the tested product is placed in the test box for testing, in order to ensure that the atmosphere around the tested product can meet the environmental conditions stipulated by the test specifications, the size of the working space of the climate box and the outer size of the tested product The following points should be followed:
1. The volume of the tested product (W × D × H) shall not exceed the effective working space of the test chamber (20-35) (20 is recommended). It is recommended to select no more than 30 for products that generate heat during the test.
2. The ratio of the windward cross-sectional area of ​​the tested product to the total area of ​​the working chamber of the test box on this cross-section is not greater than (35-50) (35 is recommended).
3. The distance between the outer surface of the tested product and the wall of the test chamber should be at least 100-150mm, (150mm is recommended).
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