F - Mech Eng,Light,Heat,Weapons – 24 – H
Patent
F - Mech Eng,Light,Heat,Weapons
24
H
F24H 9/20 (2006.01) H01H 35/18 (2006.01)
Patent
CA 2232184
Multiple resistance type electric heating elements projecting into the interior of the storage tank portion of an electric water heater are protected against dry firing damage by using a water soluble member, representatively a sugar cube, positioned in the empty tank and blocking the spring-driven movement of a switch closure member that maintains an electrical circuit in an open state preventing electrical current flow through any of the heating elements. When the tank is initially filled with water the sugar cube dissolves, thereby unblocking the switch closure member and permitting it to be spring-driven into a circuit closing position to permit electrical current flow through the heating elements.
Cette invention concerne un moyen de protection des éléments chauffants électriques à résistance multiples placés dans le réservoir d'un chauffe-eau contre la destruction par mise sous tension à sec. Il s'agit d'un élément soluble dans l'eau, nommément un cube de sucre, placé dans le réservoir vide entre les contacts à fermeture par ressort d'un interrupteur pour maintenir le circuit d'alimentation ouvert et empêcher la mise sous tension des éléments chauffants. Au remplissage initial du chauffe-eau, le cube de sucre se dissout pour laisser les contacts de l'interrupteur se fermer sous l'impulsion des ressorts pour fermer le circuit d'alimentation et assurer la mise sous tension desdits éléments chauffants.
Blake Cassels & Graydon Llp
Rheem Manufacturing Company
LandOfFree
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