US 6,632,018 B2 · Thermocouple-type temperature-detecting device

Abstract

A thermocouple-type temperature-detecting device excellent in the temperature measurement responsiveness constituted of an outer protective pipe 1 and an inner protective pipe 2, the outer protective pipe 1 is formed in a laminated layer structure of a 2nd layer 10 made of a ceramic containing molten metal-repelling BN and a 1st layer 11 made of a ceramic, the inner protective pipe 2 is formed of a front protective pipe 3 made of a ceramic having a good heat conductivity and a heat-shielding rear protective pipe 4 extending into the outer protective pipe 1 through an air layer 17, furthermore, the head portion 5 of the front protective pipe 3 is projected from the outer protective pipe 1, and a temperature-sensitive portion 20 of a thermocouple is disposed in the inside of the head portion 5.

Claims12

Dependent claims

A thermocouple temperature-detecting device comprising:

a ceramic-made outer protective pipe having an outermost layer of a material mainly comprising Si3N4 and containing 10-40 vol % of BN;
a first fixing member;
a ceramic-made front protective pipe fixed to the inside, at a front end portion, of the outer protective pipe by the first fixing member in a manner such that a closed end head portion of the front protective pipe is projected to an outside of the outer protective pipe;
a heat-resisting ceramic filler packed in an inside of the front protective pipe;
a rear protective pipe fixed to an open end portion of the front protective pipe opposite the closed end head portion;
and
a pair of alloy element wires having different respective compositions, which are laid in the filler and constitute a temperature-measuring portion, the wires connect at a side of the closed end head portion.

4 more elements

Dependencies are inferred from the claim text.

Thermocouple-type temperature-detecting device

Life of this patent

Thermocouple-type temperature-detecting device

Life of this patent

Abstract

Claims12