Rectangular heat preservation air valve blade structure with leakage requirement

The rectangular heat preservation air valve blade structure with the leakage requirement comprises side plates, a rubber and plastic heat preservation layer and a shaft are fixed between the two side plates, and the shaft and the rubber and plastic heat preservation layer are perpendicularly and fixedly connected. The side plate is of a rectangular structure with the middle protruding, and the middle protruding part is used for installing a shaft; the rubber-plastic insulating layers are positioned on two sides of the shaft; the blade sealing strip is located on the outer side of the rubber and plastic heat preservation layer and clamped between the two side plates, the blade sealing strip is fixedly connected with the side plates through bolts, spring washers and locking nuts, the bolts penetrate through the side plates and the blade sealing strip and are in threaded connection with the locking nuts, and the spring washers are located between the locking nuts and the side plates; the parts, exposed out of th