Patent ID: 9534802
Date: 2017-01-03
CPC Classifications: F04D,F24F

Claim:
1. A ventilation device mounted on an inner wall in a wind tunnel communicating between indoor and outdoor sides, comprising: a ventilation louver, including a louver frame and a movable louver, wherein the louver frame is mounted at a front opening of a ventilation device body of the ventilation device and the movable louver is supported by a movable louver shaft at a lower part of the louver frame and covers a front side of the louver frame, wherein a horizontal distance from a center of gravity of the movable louver to an inner wall at the indoor side is greater than a horizontal distance from the movable louver shaft to the inner wall; a lever disposed at a lower part of the louver frame to move in a left-right direction along a bottom end face thereof; a connection element connects the movable louver with the lever between the movable louver and the louver frame, which is configured to be a slidable structure in an up-down direction, and transforms the movement in the left-right direction of the lever to opening and closing movement of the movable louver around the movable louver shaft, wherein the lever includes a horizontal slot disposed in its end face facing the lower part of the louver frame opening portion, and a corresponding protrusion plate is disposed to extend in the left-right direction on the lower part of the louver frame opening portion, the protrusion plate is fitted in the slot and slidable in the left-right direction therein.