JPS58194208A - Measuring wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a measuring wire formed by embedding an electrical measuring wire in an insulator such as ceramic.

An example of a conventional sensor such as a thermocouple is one in which an electrical measuring wire is installed inside a core and the periphery is filled with insulating powder such as magnesia.

In conventional products such as these, chromel, armello, constantan, cap wire, etc. are used as the metal wire for electrical measurement installed in the core, and those with an outer diameter of 1 mm or more are used. An insulator such as magnesia is inserted through a hole with a certain diameter, and the outer shell is coated with a metal such as stainless steel, and the outer metal body is rolled with rollers, dies, etc. A thermocouple with a desired outer diameter is manufactured by reducing the diameter of the metal wire installed in the core by performing plastic processing such as drawing.

This conventional method requires complicated processes such as repeated plastic working and an annealing process each time, and these processes also require considerable skill and require a large amount of manufacturing equipment. Investment is required. Furthermore, a fatal flaw in these conventional methods is that the difficult process of reducing the diameter of the metal wire in the insulator causes accidents such as breakage of the metal wire. In addition, the finished products that are manufactured using conventional methods such as those offered on the market are considered to have already deteriorated because the surface of the metal wire has been considerably damaged. It can be inferred.

There is a basis for providing the present invention to stamens.

That is, the method of the present invention is different from conventional methods in that it is possible to manufacture a sensor with a desired outer diameter without the step of reducing the diameter of the metal wire in an insulator.

The present invention will be described in detail. FIG. 1 is a shape diagram of an embodiment according to the present invention. 1 is a metal wire that generates an electromotive force, such as Armello or Constantan. 2 is an insulator such as soft mud-like magnesia or alumina. Fig. 2 is an enlarged view of the soft mud state of No. 2. 21 is fired fine particles such as magnesia or alumina, and 22 is a binder such as silicone oil or paraffin. This 22 binder is 50
It is evaporated by heating at 0° C. to 500° C., and has the effect of shrinking the 21 insulating particles covered by it.

In this way, the soft mud-like material was heated to the extent that the binder evaporated, and the melting point of the metal wire 1 in the core was 1000°C.
It should not be affected at all since it exceeds the above.

After heating in this manner, the outer surface of 2 is coated with a water-wetting resin or coated with metal powder by thermal spraying.

This is the state in which the outer surface of 5 in FIG. 3 is coated.

The sensor of the present invention has the remarkable advantage that the metal wire, which is the core wire, can be buried very easily in the ceramic material, and therefore, there is no possibility of wire breakage, which can be a fatal accident, during production, as in the case of the conventional sensor. It is something that you have.

[Brief explanation of drawings]

1 to 3 are shape diagrams of one embodiment of the present invention, and FIG. 2 is an enlarged partial view of the part 2 in FIG. 1. 1 core wire. 2...Mud-like insulator. 21...Fine insulating particles. 22... Binder. 3...Material in contact with water. Patent applicant Kiyoshi Kano 5- Figure 1

Claims (1)

[Claims] An electrical measurement wire is installed in the core, and the periphery is filled with insulating ceramic powder such as magnesia.A ceramic mud-like outer shell is formed as the outer shell, and the wire is buried in the core. A measurement wire comprising an electrical measurement wire embedded in an insulator, characterized by being heated at a temperature at which the wire does not melt and coated with a water-repellent material.