ADAPTER STRUCTURE OF VENTILATING FAN

摘要

The present invention pertains to an adapter structure of a ventilating fan, the structure comprises: an oval metal adapter and an oval metal shutter provided in the metal adapter and being cooperated with a shape of the oval metal adapter , wherein a symmetry axis of a longitudinal cross-section of the oval metal shutter in the horizontal direction is a major axis, and a symmetry axis in the vertical direction is a minor axis, the shutter is configured to be rotatable through a rotating shaft in the metal adapter , a curve point is provided between a projection point of a center line of the rotating shaft on the minor axis and a tail of the shutter, and a curve portion of the shutter is formed by curving the shutter from the curve point to an inner surface side of the shutter along the minor axis. The present invention can suppress the vibration of the shutter in a position where the shutter is opened and prevent turbulent flow so as to improve quality and reliability of the product.