Electric air preheater for an internal combustion engine

摘要

A preheater for heating air to be mixed with the fuel-air mixture for an internal combustion engine for ease of combustion in cold weather includes a hollow cylindrical casing defining a heating chamber in which is positioned a cylindrical rod-shaped electric resistance heating element. A cover at one end of the casing supports the heating element and is provided with a cold air inlet. A heated air outlet from the heating chamber is provided on a cover closing the other end of the casing and communicates with a valve body having a flow passage provided with an adjustable spring-biased check valve arranged to prevent flow in the direction toward heating chamber. An adjustable needle valve is provided in the flow passage intermediate the heated air outlet and the check valve for regulating the flow rate of heated air therethrough.