F - Mech Eng,Light,Heat,Weapons – 22 – B
Patent
F - Mech Eng,Light,Heat,Weapons
22
B
F22B 1/28 (2006.01) A47J 27/04 (2006.01) F22B 35/02 (2006.01) F24C 7/06 (2006.01) F24C 13/00 (2006.01)
Patent
CA 2526761
According to the invention, a steam generator (40) is provided having a housing (52) for forming a steam generating chamber (54), the housing having a steam outlet port (68). A heater plate (56) is supported by the housing (52) within the steam generating chamber. A water inlet valve (42) is fluidly connected to the housing for selectively supplying water into the steam generating chamber whereby water is directed to the heater plate for conversion to steam. The heater plate (56) forms a bottom wall of the steam generating chamber and is arranged to have a high point. The water inlet valve is opened and closed in accord with a duty cycle which alternates between two phases: a fill phase duty cycle and a steady state duty cycle. The steady state duty cycle is relatively slower than the fill phase duty cycle such that during the fill phase water the level of water in the steam generating chamber rises and in the steady state phase the level of water in the steam generating chamber decreases. In a boil dry condition (over threshold), the high point of the heater plate begins to overheat first such that a temperature sensor mounted to the heater plate at the high end of the heater plate can operate to prevent overheating of the heater plate. It is also possible to sense for leakage current to allow for safe operation of the steam generator at critical heat flux, thus ensuring a high efficiency and fast steam generation.
Bedetti Nicola
Eckstein Robert
Fossati Laura
Parachini Davide
Willemen Mauritz
Corporation Whirlpool
Ridout & Maybee Llp
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