Magnetically-controlled gas ignition system
First Claim
1. An automatic fuel ignition and detection system for gas fired devices having a source of electrical power, a burner provided with an outlet, and a fuel valve for controlling the flow of gas into said burner,said system comprising an electrical ignition element connected to said source of electrical power and located in proximity to said burner outlet for igniting gas flowing thereto when said ignition element is energized and brought to a gas ignition temperature,a heat-sensing element mounted adjacent to said ignition element in a position to receive the heat therefrom,said heat-sensing element being normally magnetically attractable and having a Curie temperature at least as high as said gas ignition temperature at which it loses its magnetic attractability,a permanent magnet positioned to be attracted to and engaged by said heat-sensing element when the temperature of the latter is below its Curie temperature, said magnet being released by said heat-sensing element when the latter is heated to its Curie temperature,biasing means urging said magnet in a direction away from said heat-sensing element,and means operatively connecting said magnet to said fuel valve for closing said fuel valve when said magnet is in engagement with said heat-sensing element, and opening said fuel valve when said magnet is released by said heat-sensing element and moved out of engagement therewith by said biasing means,whereby gas is fed through said burner only after said ignition element has been heated to said gas ignition temperature.
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Accused Products
Abstract
An automatic gas ignition system including an electrically-energized gas ignition element in proximity to a gas burner and a magnetic heat-sensing device comprising a permanent magnet and a sensing plate having a Curie temperature at or above the ignition temperature of the gas in the system. The sensing plate is located close to the ignition element so as to be heated thereby. The magnet is attracted into contact with the sensing plate when the latter is at a temperature below its Curie temperature, and is released from the plate when the latter is heated to its Curie temperature by the ignition element. The magnet is operatively connected to a valve supplying gas to the burner in such a manner as to maintain the valve closed when the magnet is attracted to the sensing plate, and to open the valve when the magnet is released by the plate. Thus, gas is permitted to flow to the burner only when the ignition element has reached a gas ignition temperature.
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Citations
9 Claims
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1. An automatic fuel ignition and detection system for gas fired devices having a source of electrical power, a burner provided with an outlet, and a fuel valve for controlling the flow of gas into said burner,
said system comprising an electrical ignition element connected to said source of electrical power and located in proximity to said burner outlet for igniting gas flowing thereto when said ignition element is energized and brought to a gas ignition temperature, a heat-sensing element mounted adjacent to said ignition element in a position to receive the heat therefrom, said heat-sensing element being normally magnetically attractable and having a Curie temperature at least as high as said gas ignition temperature at which it loses its magnetic attractability, a permanent magnet positioned to be attracted to and engaged by said heat-sensing element when the temperature of the latter is below its Curie temperature, said magnet being released by said heat-sensing element when the latter is heated to its Curie temperature, biasing means urging said magnet in a direction away from said heat-sensing element, and means operatively connecting said magnet to said fuel valve for closing said fuel valve when said magnet is in engagement with said heat-sensing element, and opening said fuel valve when said magnet is released by said heat-sensing element and moved out of engagement therewith by said biasing means, whereby gas is fed through said burner only after said ignition element has been heated to said gas ignition temperature.
Specification