Patent ID: 8840454
Filing Date: 2014-09-23
Classification: F04D,F24F

Abstract:
1. A shutter device comprising: an intake port adapted to be connected with a side into which air enters; a discharging port adapted to be connected with a side from which air is discharged; a shutter mount provided between the intake port and the discharging port, the shutter mount having an inner diameter larger than a diameter of the discharging port; a shutter for preventing air from entering from the discharging port; a shutter frame inserted into an inside of the shutter mount so as to mount the shutter partially within a step between the shutter mount and the discharging port; and a shutter support shaft supporting the shutter, wherein the shutter frame includes a rib which contacts the shutter when the shutter is closed, so that the rib closes a gap between the shutter and the shutter mount, an upper end of the rib protrudes toward a side of the intake port with respect to the shutter support shaft, a lower end of the rib protrudes toward the side of the discharging port with respect to the shutter support shaft, within a range from the upper end to the step, portions of the rib which contact the shutter are positioned in an area from the step to the intake port, within a range from the lower end to the step, portions of the rib which contact the shutter are positioned in an area from the step to the discharging port, the shutter has an upper end configured to contact the upper end of the rib and a lower end configured to contact the lower end of the rib, the shutter has curved portions provided at left and right sides of the shutter and the curved portions protrude toward the intake port when the shutter is closed, the shutter support shaft is positioned at a side of the upper end of the rib between the upper end of the rib and the lower end of the rib, and the curved portions are provided between the shutter support shaft and the lower end of the shutter.