| 摘要 |
1. Control device for opening a gate (1) able to deliver a pressurized combustible gas, said control being made by closing an electric switch (3) and setting normally in action, successively, excitation of a first relay contactor (2) intended to open the gate (1) by feeding it with an electric voltage (10), actuation of an igniter (5) of said gas, detection (6) of the flame corresponding to the so ignited gas, automatic closing of said gate (1) if said detection is not actual at the end of an opening period T0 of said gate and excitation, in the contrary case, of a second relay contactor (7) with several movable contacts (71 , 72 ) mounted so as to stop the working of the igniter (5) and to maintain the electrical feed of the gate (1), beyond the period T0 , by an alternating voltage (8) rectified through contacts (21 , 71 ) and a rectifier (9), a protection circuit-breaker (14) being mounted so as to be blown out and to consequently cut said feed (8) if one of the movable contacts (71 , 72 ) of the second relay contactor (7) is in an inadequate position on starting, characterized in that, in view of automatically blowing out said circuit breaker (14) when any one said movable contacts (71 , 72 ) of the second relay contactor (7) is in its working position while the first contactor (2) is in its resting position, each of said movable contacts (71 , 72 ), in its working position, serially connects the voltage source (8), the circuit-breaker (14), one closed contact (21 ) of the first relay contactor (2) in its resting position and rectifier means (respectively 15, 16 and 17, 18) allowing flowing of a rectified current in the sense opposite to that of the current which normally feeds the gate (1) beyond each period T0 . |
