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Thermostatically controlled electric fluid heating apparatus

  • US 4,356,383 A
  • Filed: 11/20/1979
  • Issued: 10/26/1982
  • Est. Priority Date: 11/22/1978
  • Status: Expired due to Term
First Claim
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1. A heating apparatus for heating of a fluid comprising:

  • a conduit having a fluid passage therethrough for conduction of a fluid to be heated;

    heating means in heat transfer contact with a portion of said conduit for heating the fluid being conducted therethrough;

    temperature sensing means positioned in engagement with said conduit at a predetermined location along said conduit external to said conduit for sensing the temperature of fluid to be conducted through said conduit;

    means operatively associated with said temperature sensing means for controlling operation of said heating means in response to the temperature of the fluid sensed by said temperature sensing means; and

    constricting means associated with said conduit for maintaining the fluid in said fluid passage in contact with said conduit at said predetermined location when the flow rate of said fluid through said fluid passage is below a predetermined flow rate so as to guide the fluid in said conduit in temperature sensing relationship with said temperature sensing means, said constricting means being responsive to the flow rate of fluid through said fluid passage at said predetermined location to vary the cross-sectional area of the fluid passage between a predetermined cross-section area when the flow rate of said fluid is below a predetermined flow rate and a larger cross-sectional area when the flow rate of said fluid is above said predetermined flow rate, said predetermined cross-sectional area being of a size less than the unconstricted cross-sectional area of said fluid passage in said portion of said conduit in heat tranfer contact with said heating means.

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