JPS58123782A - Thermocouple - Google Patents

Abstract

PURPOSE:To improve corrosion resistance, acid resistance, heat resistant property and insulating property by coating the surface of the constitutional material of the thermocouple through the application, spraying, etc. of fine ceramic powder. CONSTITUTION:A thermocouple strand 1 is immersed into a joining liquid or a bonding agent is smeared onto the surface. Ceramic powder 2 is sprayed against the surface of the thermocouple stand and rubbed against it by a roller, and the surface is coated with ceramic powder 2. Ceramics are proper as the protective film of the thermocouple because they have excellent corrosion resistance, acid resistance and heat-resisting property and are brought to a superiorly insulated state. When the extent of the coating of a sensing section is thinned, sensitive structure can be obtained, and flexibility can be ensured sufficiently.

Description

[Detailed description of the invention] The present invention relates to the surface of a thermocouple wire.

Conventional thermocouple wires are, for example, PR, OA, CR.
The temperature sensed at the connected part is measured by connecting the wires specified in J Engineering S standards such as Olxc, CC, etc., but for that reason, the wire insulation powder Measures are being taken such as burying the wires inside the wires or installing overhead wires on insulators to prevent the wires from becoming shallower. In addition, there are various problems such as the need to ensure that the area around the heat-sensing portion of the wire has good heat conductivity in order to ensure temperature measurement.

The surface of the thermocouple element wire of the present invention satisfies these requirements and provides a surface suitable for a flexible thermocouple structure, which has not been possible in the past.

That is, the present invention provides a thermocouple wire in which the surface of the thermocouple wire is coated with finely divided ceramic pieces, fine powder, or the like. Therefore, the surface of the thermocouple wire is not used as is in the past.
In particular, since the coating material is made of ceramic material, it has excellent corrosion resistance, acid resistance, heat resistance, and perfect insulation.Furthermore, the sensing part can be made into a sensitive structure by thinning the coating, so it can be easily used as a cotton thermocouple. It can also coat thermocouples with minute diameters, so it adds sufficient flexibility to thermocouples with a diameter of 0.2 mm or less.

The present invention will be described in detail. FIG. 1 is a shape diagram of an embodiment of the present invention. FIG. 1 is a diagram showing the shape of a wire of a thermocouple, one surface of which is coated with fine pieces of ceramic according to the present invention. FIG. 2 is an enlarged view of the partial cross-sectional shape of FIG. 1. 1 is the thermocouple wire itself, and 2 is a ceramic fine piece. 3 is an adhesive that joins the ceramic minute pieces of 2 and the thermocouple wire of 1. The bonding agent in step 3 is applied by dipping the surface of the wire in step 1 into the bonding solution in step 3 (= soaking it or painting it on the surface, then spraying fine pieces of ceramic on it, or rubbing it with a roller, etc.) to bond the thermocouple element. The entire surface of the wire is coated.In this way, the surface of the thermocouple wire can be coated with ceramic, so it can be used as is as it has high corrosion resistance, acid resistance, heat resistance, and insulation properties. It can be provided to the market at a lower cost than conventional products.

[Brief explanation of the drawing]

FIG. 1 is a shape diagram of one embodiment of the present invention, and FIG. 2 is a sectional view of a partially enlarged view of FIG. 1. 1... Thermocouple wire. 2... Ceramic coated surface of 1. 3... Bonding agent. 1' tusk 2r3

Claims (1)

[Claims] Two different types of thermocouple wires, such as PR, OA, ORC!
. IC! , QC%, the surface of the connected thermocouple component material is coated with fine ceramic powder, sprayed, etc. to make the surface heat resistant. Acid resistant, corrosion resistant, insulated thermocouple.