F - Mech Eng,Light,Heat,Weapons – 23 – N
Patent
F - Mech Eng,Light,Heat,Weapons
23
N
F23N 5/24 (2006.01) F23N 5/20 (2006.01)
Patent
CA 2453077
The invention relates to a safety device for an industrial boiler (CHA) comprising electromechanical relays (RE¿n?, RS), which are connected in series in order to form an electromechanical safety chain (CH1), and at least one shunt relay (RT¿n?) which is normally open and mounted in parallel to one of the electromechanical relays (RE¿n?). Said shunt relay is controlled by an automaton (API) so that it is closed during a time delay. According to the invention, the shunt relay (RT¿n?) is provided with a contact that is connected to an electronic circuit (CE¿n?) and said electronic circuit (CE¿n?) opens an electromechanical relay (RS) which is mounted in series in the safety chain when the shunt relay (RT¿n?) is closed for longer than the time delay. Given said arrangement, in the event of an automaton failure, the time delay is ensured by the electronic circuit so that a satisfactory level of safety is guaranteed in relation to the installation.
Le dispositif de sécurité pour chaudière industrielle (CHA) comprend des relasis électromécaniques (REn, RS) connectés en série pour former une chaîne de sécurité électromécanique (CH1), et au moins un relais de shunt (RTn) normalement ouvert et monté en parallèle de l'un desdits relais électromécaniques (REn), ledit relais de shunt est piloté par un automate (API) pour être fermé pendant une durée de temporisation. Dans ce dispositif, le relais de shunt (RTn) a un contact relié à un circuit électronique (CEn), et le circuit électronique (CEn) commande une ouverture d'un relais électromécanique (RS) monté en série dans la chaîne de sécurité en cas de fermeture dudit relais de shunt (RTn) pendant une durée supérieure à ladite durée de temporisation. Avec cet agencement, en cas de défaillance de l'automate, la temporisation est assurée par le circuit électronique pour garntir une sécurité satisfaisante de l'installation.
Alstom Switzerland Ltd.
Robic
Stein Energie Chaudieres Industrielles
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