Device for burning pre-mixed gas

Abstract

A device for burning premixed gas, including a ventilator ( 1 ) for drawing in the air/gas mixture, a gas-supply valve ( 2 ), a gas injector ( 3 ), and a venturi ( 4 ) interposed between said injector ( 3 ) and the ventilator ( 1 ), so as to create a negative pressure on the gas valve ( 2 ), The venturi ( 4 ) includes a movable part ( 40 ) capable of moving under the action of said ventilator ( 1 ) and a restoring spring ( 43 ), the displacement of said movable part being capable modifying the cross-sections of the passages ( 41, 42 ) for gas (G) and air (A).

1 . A device for burning premixed gas comprising:
 a ventilator drawing in an air/gas mixture,   a gas-supply valve,   a gas injector, and   a venturi interposed between said gas injector and said ventilator, so as to create a negative pressure on said gas-supply valve,   wherein said venturi comprises a movable part moving under action of said ventilator and a restoring spring, and wherein displacement of said movable part modifies cross-sections of passages for gas and air.   
     
     
         2 . Device according to  claim 1 , wherein said movable part comprises a planar wall being subjected to negative pressure exerted by said ventilator on one face of said planar wall, and, on an opposite face of said planar wall, projecting elements inserted into openings of a body, said movable part being guided in displacement, said body being connected to a supply means for gas or air, wherein cooperation of said projecting elements with said openings occurs through conical surfaces so that depth of insertion of said projecting elements into said openings changes dimensions of the passages, and wherein flow rates are modulated.