JPH0786024A - Radiation-resistant electromagnetic device - Google Patents

Abstract

PURPOSE:To obtain a radiation-resistant, heat-resist and electromagnetic device by a method wherein the coil windings are formed of inorganic insulating wire comprising a conductor convered with a metallic sheath as well as an inorganic insulating material filling up the space between the conductor and the metallic sheath. CONSTITUTION:The displacement of a core 19 by a pressure P in an arrow direction is detected by a voltage signal on the operational principle of a differential transformer. At this time, the primary windings and the secondary windings of the differential transformer are respectively represented by CP1, CP2 and CS1, CS2. As for these windings, a heat resistant and high radiation resistant exterior insulating conductor is used. That is, an inorganic insulating wire comprising a conductor 16 convered with a metallic sheath 18 as well as an inorganic insulating material 15 filling up the space between the conductor 16 and the metallic sheath 18 is used. Through these procedures, the title electromagnetic device without deteriorating the insulation characteristics at all even in high temperature and radiation atmosphere can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic application part utilizing an electromagnetic effect, and more particularly to an electromagnetic application part which can be used even in a radiation atmosphere.

[0002]

2. Description of the Related Art In an atmosphere of radiation, various values,
For example, there are many cases where it is desired to measure displacement, pressure, magnetic field strength, electric field strength, and the like. In these measurements, a circuit is configured so that the measured amount can be detected as an amount of change in electricity. In that case, an electromagnetic coil is often used as the sensor portion. For the winding of this electromagnetic coil, a so-called enamel wire, in which an insulating resin paint is baked on the surface of a copper wire, is generally used. However, since the heat resistance of the insulating sheathing material is poor and it cannot withstand use at high temperatures, a conductor wire or the like coated with a ceramic is used as a winding wire at high temperatures.

[0003]

However, the ceramic coating wire used for the coil winding of the electromagnetic application part has higher heat resistance than the resin coated wire, but it is used in a radiation atmosphere or a high temperature atmosphere. Is
It was found that the insulation characteristics deteriorate rapidly. If the insulation characteristics are deteriorated, the performance as a coil for electromagnetically applied parts cannot be obtained. For example, if it is used for measurement, its accuracy and reproducibility exceed the allowable accuracy, and it cannot be used for measurement. It is considered that the cause is that the ceramic coating thin film is cracked or separated by radiation under high temperature, or the insulating property is deteriorated by ionization action by radiation.

In order to solve the above problems, an object of the present invention is to provide an electromagnetic application part using a coil winding having heat resistance of several hundred degrees or more and high radiation resistance.

[0005]

In order to solve the above problems, the present invention covers the coil winding with a metal sheath,
It is formed by an inorganic insulating wire in which an inorganic insulating material is filled between the conducting wire and the metal sheath. Specifically, some electromagnetic applied parts always have a winding part, but the above-mentioned inorganic insulated wire is used as the conductive wire for that winding, and the insulation characteristics deteriorate even at high temperature and in a radiation atmosphere. An electromagnetic application component having a coil winding that does not occur is provided.

[0006]

In the electromagnetic application component according to the present invention, the conductive wire used for the winding is covered with the metal sheath, and the inorganic insulating material and the conductive wire are contained therein. Therefore, the sheath or conductive wire used for this has a high melting point, its characteristics do not change even at temperatures of several hundreds of degrees, and by selecting a material with high stability under radiation, the conductive wire itself used for winding can be selected. Heat resistance and radiation resistance can be obtained. As a result, it is possible to obtain an electromagnetic application component in which the electromagnetic characteristics of the coil are less likely to deteriorate even under high temperature and radiation.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows an overall connection diagram of a pressure measuring device, which is a combination of a differential transformer type displacement gauge and a bellows, among electromagnetic application parts to which the present invention is applied. In FIG. 1, 19 is a core. Since this core is displaced by the pressure P as shown by the arrow, the displacement is detected as a voltage signal by the operating principle of the differential transformer. CP1, CP
Reference numeral 2 represents a primary winding of the differential transformer, and CS1 and CS2 represent secondary windings.

In the present invention, an armored insulated conductive wire having high temperature resistance and radiation resistance is used as the winding. That is, an inorganic insulated wire is used in which the conductive wire is covered with a metallic sheath and an inorganic insulating material is filled between the conductive wire and the metallic sheath, the details of which will be described later. 1 is the plug side of the mounting device, 2
Is the socket side of the mounting device. Reference numerals 5 and 6 are extraction cables on the socket side, which are also inorganic insulated cables. 7a and 7b are adapters for drawer leads, 8
Reference numerals a and 8b are lead wires.

FIG. 2 shows an example of the construction of the mounting device shown in FIG. 1 on the plug side. CP1, CP2, and CS1,
CS2 corresponds to the primary and secondary windings in FIG. 9 above
Reference numerals a, 9b and 10 are yoke rings, and 11a and 11b are coil spacers. 3 is a coil cable, 4 is a guide ring, and generally SUS is used. Reference numeral 19 is a core, and this displacement is detected by the differential transformer. The spring 14 of FIG. 3 is deformed according to the strength of the pressure P applied to the plunger 17 of the bellows 13, and the core 19 moves in the direction of the arrow in FIG.
An imbalance occurs in the induced voltage of No. 2, and the difference voltage appears as a voltage corresponding to the displacement of the core 19. 12 is a bobbin.

FIG. 3 schematically shows the structure of the bellows assembly. The side 17 indicates the side connected to the differential transformer section. It has been described above that when the bellows 13 having the spring 14 is deformed by the pressure P, the core 19 moves accordingly, resulting in an imbalance of the induced voltage in the secondary coil of the differential transformer. FIG. 4 shows a sectional view of the inorganic insulated wire used for the coil wire. Reference numeral 18 is a metal sheath made of stainless steel or the like, 16 is a conductive wire, and 15 is an inorganic insulating material such as magnesia powder or alumina powder filled in the metal sheath 18. The winding of the coil is formed by the inorganic insulated wire having such a structure. Further, FIG. 5 shows an example of the electromagnetic probe, and detailed description of the structure is omitted. This coil 20
An inorganic insulated wire is used for the winding of the same as above.

[0011]

As described above, by using the inorganic insulating wire according to the present invention for a coil, it is possible to obtain an electromagnetically applied component which does not deteriorate in insulation characteristics even in a high temperature and radiation atmosphere.

[Brief description of drawings]

FIG. 1 is an overall connection diagram of an electromagnetic application component according to an embodiment of the present invention.

FIG. 2 is a differential transformer section of the electromagnetic application part.

FIG. 3 is a bellows assembly part of the electromagnetic application part.

FIG. 4 is a cross-sectional view of an inorganic insulated wire used in the electromagnetic application part.

FIG. 5 is an overall connection diagram of an electromagnetic application component showing another embodiment of the present invention.

[Explanation of symbols]

 1 mounting device plug side 2 mounting device socket side 3 coil cable 4 guide ring 5, 6 socket side extraction cable 7a, 7b adapter for extraction lead 8a, 8b extraction lead wire 9a, 9b, 10 yoke ring 11a, 11b coil Spacer 12 Bobbin 13 Bellows 14 Spring 15 Inorganic insulating material 16 Conductive wire 17 Plunger 18 Metal sheath 19 Core 20 Coil CP1, CP2 Primary winding CS1, CS2 Secondary winding

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yuzo Teruyama 3-19-5 Namerikawa Honcho, Hitachi City, Ibaraki Prefecture Inside Sukegawa Electric Industry Co., Ltd. No. 5 Sukegawa Electric Industry Co., Ltd.

Claims (1)

[Reference number] 0915050-02 [Claims] 1. An electromagnetic application part having a coil wire for use in a radiation atmosphere, wherein the coil wire covers a conductor wire with a metal sheath, and an inorganic insulating material is filled between the conductor wire and the metal sheath. Radiation resistant electromagnetic application parts characterized by being made of inorganic insulating wires