Patent ID: 7618481

Claim:
A core unit of a dehumidifier comprising: a drying agent absorbing water from moist air and giving water to dry air; two towers being parallelly mounted in the core unit and filled with the drying agent and having upper and lower openings; a lower air valve mounted on the two lower openings of the towers, wherein the lower air valve has an airway being formed transversely through and connecting the lower ends of the towers; two waterways, formed perpendicularly to the airway and communicating with the airway and the lower opening of the corresponding tower; and an outside hole communicating with the airway; two control valves being mounted securely to the lower air valve and communicating with the waterways and respectively communicating with the lower openings of the towers through the lower airway; a three way valve being mounted inside the airway between the waterways alternately closing one side of the airway; an upper air valve mounted on the upper openings of the towers, wherein the upper air valve comprises an internal channel formed in the upper valve and having a threaded end; and two mounting holes respectively communicating with the internal channel and the upper opening of the corresponding tower; and two check valves respectively mounted in the corresponding mounting hole of the upper air valve and the upper opening of the corresponding tower and each check valve comprising a chamber having: a top end communicating with the corresponding lower hole of the upper valve; a lower open end; and an equalizing slot defined through the chamber and communicating with the upper end of the corresponding tower.