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Deterioration detector and thermocouple inspection device

  • US 10,209,144 B2
  • Filed: 11/21/2014
  • Issued: 02/19/2019
  • Est. Priority Date: 01/06/2014
  • Status: Expired due to Fees
First Claim
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1. A deterioration detection device provided with a protection tube thermocouple for detecting deterioration of the protection tube thermocouple by applying current to the protection tube thermocouple, whereinthe protection tube thermocouple includes a thermocouple, and a protection tube which accommodates the thermocouple,the protection tube includes:

  • a conical portion formed on a front end side of the protection tube;

    a hollow portion which extends in a length direction of the protection tube for connecting between a front end and a rear end of the protection tube in the inside of the protection tube, and into which the thermocouple is received; and

    a main body portion formed on the rear end side with respect to the conical portion,the hollow portion in the conical portion has a tapered portion configured such that a sectional area of the hollow portion decreases toward the front end, andthe hollow portion includes;

    a cylindrical portion which is formed on the rear end side with respect to the tapered portion, a radius of the cylindrical portion being set to be larger than a radius of the tapered portion on the rear end side; and

    a step portion which is formed within the conical portion on the front end side with respect to a connection position between the conical portion and the main body portion, and which connects between the cylindrical portion and the tapered portion.

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