Dual venturi for combustor

Abstract

The present invention relates to a dual venturi for a combustor and, more specifically, to a dual venturi for a combustor which can control, in two stages, the amount of gas and air supplied to a burner provided in a water heater, wherein a motor and a damper are combined in such a manner that the damper is rotated by the driving of the motor, and thus the damper simultaneously opens or closes the inlet for secondary air and gas, thereby efficiently controlling the quantity of heat. The dual venturi comprises: a housing which has a first gas inlet and a second gas inlet on one side of the upper part thereof, and which has an interior divided by a partition wall such that a first passage and a second passage are formed; and an opening and closing means which is disposed in the housing, has an upper part connected to the second gas inlet such that gas flows therein, and controls the flow of air and gas by closing or opening the second passage as a damper is rotated by a motor provided on the exterior of the housing.

1 . A dual venturi for a combustion apparatus, comprising:
 a housing ( 10 ) having a first gas inlet ( 14 ) and second gas inlet ( 15 ) formed at one side of an upper portion thereof and divided therein by a partition wall ( 13 ) to have a first passage ( 11 ) and a second passage ( 12 ); and   an opening and closing unit ( 100 ) provided within the housing ( 10 ), connected to the second gas inlet ( 15 ) at an upper portion thereof such that gas is introduced into the opening and closing unit ( 100 ), and controlling flows of air and gas by closing or opening the second passage ( 12 ) along with rotation of a damper ( 142 ) by a motor ( 180 ) provided at an outer side of the housing ( 10 ).   
     
     
         2 . The dual venturi of  claim 1 , wherein the opening and closing unit ( 100 ) comprises:
 a tubular guide tube ( 130 ) having one or more concave guides ( 131 ) formed on an inner wall thereof;   a tubular moving body ( 120 ) having convex guides ( 122 ) formed on an outer wall thereof to correspond to the concave guides ( 131 ) so that the moving body ( 120 ) moves within the guide tube ( 130 ) in a longitudinal direction of the guide tube ( 130 ), a gas outlet ( 123 ) formed at a distal end thereof to communicate with the second gas inlet ( 15 ), and a moving body cam ( 121 ) having a cam shape formed on an outer surface thereof;   a valve body ( 140 ) having the damper ( 142 ) formed on an outer surface thereof, a gas outlet ( 143 ) formed at a side of the damper ( 142 ), and a valve body cam ( 141 ) formed at an inner side thereof in a shape corresponding to the moving body cam ( 121 ) such that the valve body cam ( 141 ) engages with the moving body cam ( 121 ), valve body ( 140 ) being coupled to the motor ( 180 );   a spring ( 160 ) provided within the moving body ( 120 ) to elastically support the moving body ( 120 ); and   a cap ( 170 ) supporting the spring ( 160 ) and coupled to an upper portion of the guide tube ( 130 ).   
     
     
         3 . The dual venturi of  claim 1 , wherein when the motor ( 180 ) is rotated and the moving body cam ( 121 ) formed at the moving body ( 120 ) is rotated, respective convex portions of the moving body cam ( 121 ) and the valve body cam ( 141 ) come into contact with each other to push the moving body ( 120 ) up, with the consequence that the opening and closing unit ( 100 ) opens the gas outlet ( 143 ) and simultaneously opens the second passage ( 12 ) by rotation of the damper ( 142 ) of the valve body ( 140 ). 
     
     
         4 . The dual venturi of  claim 2 , wherein the valve body ( 140 ) further comprises a sealing member ( 145 ) for sealing an inner lower end thereof. 
     
     
         5 . The dual venturi of  claim 1 , wherein the motor ( 180 ) is a synchronous motor. 
     
     
         6 . The dual venturi of  claim 2 , wherein when the motor ( 180 ) is rotated and the moving body cam ( 121 ) formed at the moving body ( 120 ) is rotated, respective convex portions of the moving body cam ( 121 ) and the valve body cam ( 141 ) come into contact with each other to push the moving body ( 120 ) up, with the consequence that the opening and closing unit ( 100 ) opens the gas outlet ( 143 ) and simultaneously opens the second passage ( 12 ) by rotation of the damper ( 142 ) of the valve body ( 140 ). 
     
     
         7 . The dual venturi of  claim 2 , wherein the motor ( 180 ) is a synchronous motor.