Device for controlling the delivery of a combustible gas to...

F - Mech Eng,Light,Heat,Weapons – 23 – K

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F23K 5/00 (2006.01) F23N 1/00 (2006.01)

Patent

CA 2630767

A device for controlling the delivery of a combustible gas to a burner apparatus comprises a main pipe (2) for delivery of the gas in which are disposed a first and a second servovalve (5, 6), respectively in cascade with each other, with respect to the direction of flow of the gas, the servovalves including respective valve seats (5a, 6a) associated with corresponding shut- off means (5b, 6b) with diaphragm control (5c, 6c) for the opening of the seats in opposition to respective resilient return means (5d, 6d), the first and second servovalve (7, 13) comprising a respective first and second control solenoid valve (7, 13) with electromagnetic operating means for controlling the opening/closure of the corresponding servovalve (5, 6), the solenoid valves being arranged to act for opening/closure of pipes of respective servo- assisted control circuits, so as to control indirectly, by way of the diaphragm control, the respective shut-off means (5b, 6b) of the corresponding servovalve (5, 6), the pipes of the control circuit placing the main pipe (2) in fluid communication with respective control chambers (10, 17) of the servovalves, one side of the diaphragms (5c, 6c) of said diaphragm controls being subjected to the pressure existing in the respective control chamber. The intake pipes (8, 9) of the respective control circuits, capable of picking up the pressure signal to be transmitted to the corresponding control chamber (10, 17), are both respectively connected, in fluid communication, with the main pipe (2), upstream of the first servovalve (5).

Dispositif de commande de fourniture d~un gaz combustible à un appareil à brûleur comprenant un tuyau principal (2) permettant l~acheminement du gaz dans lequel sont disposés une première et une seconde servosoupapes (5, 6), respectivement en cascade l~une par rapport à l~autre, par rapport au sens d~écoulement du gaz, les servosoupapes comprenant des sièges de soupape respectifs (5a, 6a) associés à des moyens de coupure correspondants (5b, 6b) avec une commande à membrane (5c, 6c) pour l~ouverture des sièges en opposition à des moyens de rappel élastiques respectifs (5d, 6d), la première et la seconde servosoupapes (5, 6) comprenant une première et une seconde électrovannes de commande respectives (7, 13) avec des moyens de commande électromagnétiques permettant de commander l~ouverture/la fermeture de la servosoupape correspondante (5, 6), les électrovannes étant disposées pour permettre l~ouverture/la fermeture de tuyaux de circuits de commande servo-assistés respectifs, de façon à commander indirectement, à l~aide de la commande à membrane, les moyens de coupure respectifs (5b, 6b) de la servosoupape correspondante (5, 6), les tuyaux du circuit de commande mettant le tuyau principal (2) en communication fluidique avec les chambres de commande respectives (10, 17) des servosoupapes, un côté des membranes (5c, 6c) desdits commandes de membrane étant soumis à la pression existant dans la chambre de commande respective. Les tuyaux d~admission (8, 9) des circuits de commande respectifs, capables de détecter le signal de pression à transmettre à la chambre de commande correspondante (10, 17), sont tous deux connectés respectivement, en communication fluidique, avec le tuyau principal (2), en amont de la première servosoupape (5).

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