Many electronic instruments cannot be affected by moisture during use. They often need to be equipped with a cabinet for protection. They are called electronic instrument cabinets. However, it is impossible for electronic instrument cabinets to achieve constant humidity. It is likely that moisture will be caused by the surrounding ambient moisture. Intrusion into the cabinet, causing the components to get wet. Therefore, the electronic instrument cabinet needs to be dehumidified.
Generally, conventional dehumidification measures can be divided into two types: physical dehumidification and chemical dehumidification. Among them, physical dehumidification is convection ventilation and electric heating; chemical dehumidification is brushing three anti-paints and using desiccants. Analysis of various dehumidification methods are as follows:
Convection ventilation; the use of fans for air convection ventilation can speed up convection. However, there are problems such as explosion-proof and ash-proof, which make reconstruction difficult.
Electric heating: Install a heater in the electric cabinet, and realize the automatic control of the temperature and humidity in the electric cabinet through the temperature and humidity controller. When the heater is operating, the high-temperature air can contain more moisture, which can cause the condensation on the equipment to evaporate. However, it is also difficult to drain excess moisture out of the cabinet, which cannot fundamentally dehumidify.
Brush-proof three-proof paint: It is generally used for dehumidification of circuit boards and electronic components. It is rarely used in cabinets for dehumidification, and it does not solve the fundamental problem. It still cannot prevent the generation of condensation, and once there is missing coating If the paint or lacquer is peeled off, flashover or short circuit will still occur.
Desiccant moisture absorption: In the industry, desiccant usually uses silicone rubber, clay, and molecular sieve as raw materials, which has strong adaptability and practicality. However, there are problems that the moisture storage speed is slow and the desiccant deteriorates quickly. Therefore, the effect is not satisfactory, large replacement and maintenance, and high costs.
Therefore, in summary, the most commonly used is physical dehumidification, and the most commonly used for electric heating dehumidification is silica gel heating sheet dehumidification.