Air drying device used for closed cavity and control method of device

Abstract

The invention discloses an air drying device used for a closed cavity and a control method of the device, and belongs to the technical field of moisture-proof equipment. The confined space is continuously dried by using two or more groups of drying components in a circulation manner, and an active switching mechanism driven by a motor and an electromagnet is adopted, so that switching of the connection state of a drying box can be quickly realized, and moisture diffused into the cavity during the switching can be almost negligible to realize the purpose of controlling the moisture in the closed cavity to an extremely low level. The solution improves the drying capacity of a current moisture-proof box by one or more orders of magnitude, and meets the application needs for strict moisture control in 3D printing supplies storage and the like.

Description

technical field [0001] The invention belongs to the technical field of moisture-proof equipment, and in particular relates to an air drying device and a control method for sealing a cavity. Background technique [0002] In the 3D printing industry, plastic consumables need to be dried before they are melted. If the undried plastic raw materials are directly used for printing, air bubbles will appear, and some plastics will even decompose, resulting in a decrease in mechanical properties and seriously affecting the molding effect. [0003] For most plastic materials, to ensure that the moisture content in the plastic raw materials is within an acceptable range, generally the ambient humidity needs to be kept below 700PPM at least, and it is best to control the humidity within 100PPM (100PPM corresponds to the relative humidity at 25°C ambient temperature about 0.41%). At present, the drying devices in the common moisture-proof boxes do not have such drying capacity. [000...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: First, the action of memory alloy is related to temperature, and the action has a large hysteresis, which cannot be opened or closed in time, which will cause a small amount of water to be discharged into the moisture-proof box at the beginning of regeneration, and the regeneration is completed. Finally, the desiccant will also absorb a small amount of external moisture due to the temperature drop; secondly, the moisture absorption process of the desiccant is intermittent, resulting in humidity fluctuations in the moisture-proof box

Therefore, this type of structure is not suitable for drying closed cavities

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