Blocking device for ventilator

Abstract

A blocking device coupled to a ventilator comprising: a frame extending from an air discharge port of a ventilator case having a fan which is rotated by a motor to suction inside air; an air passage formed by the frame to discharge the inside air to the outside therethrough; and a blocking plate mounted on a central shaft movably installed at the center of the frame. The blocking plate allows the inside air to be discharged when the blocking plate is pushed backward by the pressure of discharged air. When the fan does not rotate, the blocking plate and a blocking bump protruding from the inner surface of the frame are engaged with each other to block the air passage to prevent inner heat from being discharged and external air from being introduced.

1 . In a blocking device ( 100 ) for a ventilator, which is located at a position where the inside and the outside of a building are connected and installed in a ventilator case ( 10 ), which has a fan ( 12 ) for rotating by a motor ( 11 ) and sucking inside air, so as to block external air, the blocking device for a ventilator, comprising:
 a frame ( 110 ) mounted to be extended from an air discharge port ( 13 ), through which air is discharged, in the ventilator case ( 10 ) and fixed to an inner wall so as to form an air passage ( 111 ), through which the inside air is discharged to the outside;   a blocking bump ( 120 ) made of an insulating material and protruding from the inner surface of the frame ( 110 );   a hollow center shaft ( 130 ) movably installed in the center of the frame ( 110 );   a blocking plate ( 140 ) made of an insulating material, formed in a shape corresponding to that of the blocking bump ( 120 ), and fixed to the center shaft ( 130 ) so as to come into surface contact with an inclination with the blocking bump ( 120 ) by the movement of the center shaft ( 130 ) and thus block the air passage ( 111 ),   wherein a spring ( 160 ) is provided around the center shaft ( 130 ),   a bearing ( 150 ) is provided such that the center shaft ( 130 ) is inserted through the bearing ( 150 ),   the frame ( 110 ), the blocking bump ( 120 ), the center shaft ( 130 ), the blocking plate ( 140 ) and the bearing ( 150 ) are formed in multiple stages,   the frame ( 110 ) includes a basic frame ( 110   a ) provided at the upper end thereof and a subsidiary frame ( 110   b ) provided at the lower portion thereof,   the blocking bump ( 120 ) includes a basic blocking bump ( 120   a ) provided at the upper end thereof and a subsidiary blocking bump ( 120   b ) provided at the lower portion thereof,   the center shaft ( 130 ) includes a basic center shaft ( 130   a ) provided at the upper end thereof and a subsidiary center shaft ( 130   b ) provided at the lower portion thereof,   the blocking plate ( 140 ) includes a basic blocking plate ( 140   a ) provided at the upper end thereof and a subsidiary blocking plate ( 140   b ) provided at the lower portion thereof,   the bearing ( 150 ) includes a basic bearing ( 150   a ) provided at the upper end thereof and a subsidiary bearing ( 150   b ) provided at the lower portion thereof, and   the spring ( 160 ) is located outside the basic bearing ( 150   a ), into which the basic center shaft ( 130   a ) is inserted.   
     
     
         2 . The blocking device for a ventilator according to  claim 1 , wherein
 the basic bearing ( 150   a ) is extended vertically from the inside of the lower portion of the basic frame ( 110   a ) such that the basic center shaft ( 130   a ) is inserted through the basic bearing ( 150   a ),   a spring support protrusion ( 154 ) is perpendicularly connected to the basic bearing ( 150   a ),   a spring guide part ( 151 ) is perpendicularly connected to the spring support protrusion ( 154 ) and formed to be parallel to the basic bearing ( 150   a ),   fixing rods ( 152 ) are provided on the outer circumferential surface of the spring guide part ( 151 ), and   through holes ( 153 ) are formed between the fixing rods ( 152 ) such that air passes through the through holes ( 153 ).   
     
     
         3 . The blocking device for a ventilator according to  claim 2 , wherein the fixing rod ( 152 ) is formed in a streamlined shape ( 152   a ) so as to have a larger cross-sectional area in a direction in which air is discharged, and a hot wire is provided inside the lower surface of the subsidiary blocking bump ( 120   b ) of the subsidiary frame ( 110   b ) and the inner surface of the subsidiary bearing ( 150   b ). 
     
     
         4 . The blocking device for a ventilator according to  claim 2 , wherein a folded surface ( 131 ) is formed integrally with the basic center shaft ( 130   a ) so as to fix the upper portion of the spring ( 160 ) fitted around the basic center shaft ( 130   a ) of the basic frame ( 110   a ) and the center shaft ( 130 ) is enabled to move to a predetermined width until the folded surface ( 131 ) comes into contact with the top head of the basic bearing ( 150   a ) when the center shaft ( 130 ) moves. 
     
     
         5 . The blocking device for a ventilator according to  claim 1 , wherein the blocking plate ( 140 ) and the blocking bump ( 120 ) are made of the same material.