Importance

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Abstract

An electrode-type steam generator includes a pair of spaced electrodes extending into a pressure vessel having a feed water inlet and a steam outlet. A rotary stirring device, cycled on and off by a pressure switch in the steam outlet, is provided in the vessel below the electrodes and is operative to create a vortex which artificially raises the level of the water adjacent the sides of the vessel without water being added, whereby the electrodes are immersed to a greater extent when the stirrer is operating to increase steam production than when it is not operating. The flow of water into the vessel through the feed water inlet is controlled by a solenoid valve responsive to the current flow between the immersed portions of the electrodes. A pressure operated valve is provided in the feed water inlet upstream of the solenoid valve for overriding operation of the solenoid valve if the pressure in the vessel exceeds a predetermined value, the predetermined value being lower than the pressure at which the pressure switch is operative to cycle the stirrer on and off.

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First Claim