Safety relief valve of dehumidification unit

The safety relief valve comprises a valve plate, a lead screw and an installation support, the safety relief valve is installed on a polyurethane heat preservation panel of the dehumidification unit and an air conditioning unit, the polyurethane heat preservation panel is provided with a square opening, four nuts are welded to the valve plate, rubber and plastic heat preservation cotton is pasted in the valve plate, and the valve plate is provided with a screw rod. The valve plate is attached to a square opening of the polyurethane heat preservation panel, guide pipes are symmetrically welded to the two ends of the mounting support and inserted into the square opening formed in the polyurethane heat preservation panel, one ends of four lead screws are in threaded connection with nuts, the lead screws are located on the nuts and provided with first nuts, the lead screws penetrate through the guide pipes, and springs are arranged on the lead screws in a sleeving mode. The lower end of the spring abuts against t