JPS60152218A - Wire passing unit for coaxial cable - 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 [Technical Field] The present invention relates to an airtight coaxial cable wire penetration section provided in a wall of a containment vessel or the like of a nuclear power plant.

[Prior art]

In nuclear power generation, the core of the reactor is surrounded by a pressure vessel or containment vessel, which prevents the radioactivity inside from leaking to the outside in the unlikely event of an accident. Therefore, strict airtightness is required for this containment vessel.

Naturally, the wire penetration portion that penetrates the wall of such a containment vessel is also required to have strict airtightness. One of these types of wire penetration parts is the wire penetration part for coaxial cables, and coaxial cables consist of an insulator, an outer conductor, and an outer sheath, which are arranged concentrically from the inside around a central conductor. As expected, the cross-sectional structure is complicated, so it is difficult to seal airtightly.Therefore, in the conventional wire penetration section for coaxial cable, in which the coaxial cable passes through the above-mentioned wire penetration section, it is difficult to maintain airtightness. I have anxiety.

[Purpose of the invention]

In view of the above-mentioned problems, an object of the present invention is to provide an electric wire penetration part for a coaxial cable with excellent airtightness.

[Structure of the invention]

To achieve the above object, the electric wire penetration part for a coaxial cable of the present invention has an end plate having a through hole at both ends of an outer cylinder, which is airtightly attached, and a metal tube protrudes from the through hole of the end plate to form an airtight structure. An inorganic insulated metal sheathed cable having a two-core conductor housed in the wire-penetrating portion, the wire-penetrating portion being attached to the wire-penetrating portion and having the outer sleeve airtightly attached to the penetrating wall; A connector consisting of an insulator made of glass or ceramic that insulates a conductor in an airtight structure, and a metal eyelet that encloses the insulator in an airtight structure and one end of which is airtightly connected to the external end of the metal tube. The conductors are connected to each other at their terminals, and at the other end of the connector connected to the terminal of the inorganic insulated metal sheath cable, one conductor of this connector is connected to the center conductor, and the other conductor is connected to the external conductor. A coaxial cable to be connected to the conductor is connected, and this connector and the coaxial cable Q connection part are housed in a sleeve connected to the other end of the metal eyelet of the connector, and the inside of the sleeve has no moisture permeability. It is characterized by being filled with an insulator.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention.As shown in this figure,
An end plate 3 having a through hole 2 at each end of the outer cylinder 1 is attached airtightly by welding or the like, and a metal tube 4 protrudes to the outside from each through hole 2 of the end plate 3 and is also airtightly attached by welding or the like. This is an electric wire penetration part in which the outer cylinder 1 is airtightly taken out by welding or the like to the penetration wall 5 of the containment vessel, and there are two conductors 6 and 6 in the electric wire penetration part. An inorganic insulated metal sheathed cable 7 (hereinafter referred to as MIC) having a
The two conductors 11.1i of each connector 10 are connected by a crimp sleeve or the like (not shown). Incidentally, this connector 10 has the conductor 11.11 and the conductor 1.
1.11 has an airtight structure, that is, an insulator 12 made of glass or ceramic in the form of a spacer that insulates each conductor 11.11 with its joint surface airtightly sealed, and the insulator 12 is airtight in the same sense as above. It is composed of a metal eyelet 13 enclosed in the structure. Now, the MI' with the connector 10 arranged almost in the center of the wire penetration part like this.
At C7-, first, each through hole 2. of the end plate 3.3.
The metal eyelet 13 of the connector 10 is hermetically connected to the outer end of the metal tube 4.4 attached to the connector 2 by welding or the like. Note that the central axes of each through hole 2.2 of the end plate 3.3 are provided so as to be substantially coincident with each other. Next, coaxial cables 20.20 (one not shown) having a cross-sectional structure as shown in FIG. 2 are connected to connectors 10.10 (one not shown) connected to both ends of the MIC 70. As shown in FIG. 2, this coaxial cable 20 includes a center conductor 21, an insulator 22 provided around the center conductor 21,
It consists of an outer conductor 23 provided outside the insulator 22 and an outer sheath 24 covering the outer conductor 23,
The connection between the coaxial cable 20 and the connector 10 is as shown in FIG. Connect via lead wire 25 or the like. After that, the connection part between this connector 10 and the coaxial cable 20 is connected to the metal eyelet 13 of the connector 10.
It is housed and protected by a sleeve 30 connected to the other end with a screw or the like, and the sleeve '30 is filled with a non-moisture permeable insulator 31 such as epoxy resin.

In the electric wire penetration part for coaxial cables of the present invention thus constructed, the cable housed in the main body of the electric wire penetration part is replaced with a conventional coaxial cable, and a conductor 6.6 as shown in FIG.
Inorganic insulator 3 such as magnesium oxide powder that insulates this
5 and a metal sheath 36 made of stainless steel or the like provided around the inorganic insulator 35.
This is because the IC7 part is short and its characteristic impedance is close to that of the coaxial cable 20, so there is no problem in terms of characteristics when using the MIC7 instead of the coaxial cable 20. By arranging the cable in the center of the penetration part, it is only necessary to hermetically seal the conductors 10, 1, and 11 of the connector 10 connected to the conductor 6, 6 of the MIC 7, and it is possible to hermetically seal a coaxial cable with a complicated cross-sectional structure. It is easier to work with, and the airtightness is therefore more reliable. In addition, using a 28-conductor MIC means that you can use a standard MIC that is normally used, and therefore, the connectors 10 connected to both ends can also be ordinary products that you are used to handling on a daily basis. It can be expected to improve the reliability of airtightness.

〔Effect of the invention〕

As described above, according to the present invention, a MIC with a simple structure is used instead of a coaxial cable with a complicated structure in the main body of the wire penetration portion, thereby creating a wire penetration portion for a coaxial cable with excellent airtight reliability. Obtainable.

[Brief explanation of drawings]

FIG. 1 is a partial vertical cross-sectional view showing an embodiment of the coaxial cable wire penetration part of the present invention, FIG. 2 is a cross-sectional view of the coaxial cable according to the present invention, and FIG. 3 is a MIC according to the present invention. FIG. 1. Outer cylinder, 3. End plate, 7. MIC, 10 connector, 13
Metal eyelet, 20. Coaxial cable, 2I center conductor, 23. 4 external bodies, 30. Sleeve, 31.. Insulator.

Claims (1)

[Claims] An end plate having a through hole is attached airtightly to both ends of the outer cylinder, a metal tube protrudes to the outside and is airtightly attached to the through hole of the end plate, and the outer cylinder is airtightly attached to the through wall. A wire penetration part that has two wires stored in the wire penetration part.
An inorganic insulated metal sheathed cable having a core conductor includes an insulator made of glass or ceramic that insulates two core conductors in an airtight structure, and an insulator encapsulating the insulator in an airtight structure, and an outer end of the metal tube. a connector consisting of a metal eyelet, one end of which is airtightly connected to the connector; conductors are connected to each other at the terminals thereof, and the other end of the connector is connected to the terminal of the inorganic insulated metal sheath cable;
A coaxial cable is connected in which one conductor of this connector is connected to the center conductor and the other conductor is connected to the outer conductor, and the connection between this connector and the coaxial cable is connected to the other end of the metal eyelet of said connector. 1. An electric wire penetration part for a coaxial cable, characterized in that the wire penetration part is housed in a sleeve, and the inside of the sleeve is filled with a non-moisture permeable insulator.