JP2597351B2 - Wire penetration structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a structure for penetrating a wall of an electric wire, and particularly to a case where electric power, control signals, and the like are sent to a sealed room surrounded by a reactor shielding wall. The present invention relates to an improvement of such a structure which is suitable to be adopted in the above.

[Conventional technology]

For enclosed rooms surrounded by reactor shield walls,
When power, control signals, etc. are sent into the sealed chamber, the through-holes for the installation of electric wires on the reactor shielding wall are kept airtight to isolate the sealed chamber, which is the radiation area, from the outside. For example, JP-A-53-146089 can be cited.

Here, a schematic configuration in a case where an electric wire is laid in a closed chamber represented by a reactor shielding wall will be described with reference to FIG. 1. In FIG. 1, 1 is a reactor shielding wall, and 3 is a shielding wall. 1, a through-wall hole for laying an electric wire, 7 indicates an electric wire [for example, a MI cable (mineral insulated cable: power cable for low voltage)], and the electric wire 7 has a filling material 8 on its outer periphery.
And is laid airtightly in the wall through hole 3,
The outside of the wall through hole 3 is sealed by a wall through hole sealing member 9 (in fact, a large number of electric wires 7 are inserted in the wall through hole 3 for the purpose of increasing the density of the electric wires. , 7 ... are laid, but in FIG.
Only the wire 7 is shown, and other wires are not shown).

FIG. 4 is a partially enlarged cross-sectional view of the wire wall penetration structure according to the conventional proposal. In FIG. 4, the same reference numerals as those in FIG. 1 denote the same parts, that is, 3 denotes a reactor shielding wall (see reference numeral 1 in FIG. 1). 7) shows a wall through hole for laying an electric wire, 7 denotes an electric wire, 9 denotes a wall through hole sealing member for sealing the outside of the wall through hole 3, and the configuration of the electric wire 7 is as follows.

In FIG. 4, a conductor 7a which is a central component of the electric wire 7 is shown.
Outside the metal tube with a gap between the conductor 7a
7c is covered, and a gap between the metal cladding tube 7c and the electric wire conductor 7a is filled with an insulating material 7b made of, for example, powdered ceramics. In addition, an end plug-shaped insulating material 7d made of, for example, solid ceramics is mounted on an end of the metal-coated tube 7c.
The leakage of the powdered insulating material 7b filled in the inside 7c is prevented. Reference numeral 10 denotes a terminal connected to the conductor 7a.
10 is supported by a metal sleeve 15 via an insulating material 16, and the metal sleeve 15 is attached to the wall through-hole sealing member 9.

In FIG. 4, reference symbol a denotes a connection portion between the electric wire conductor 7a and the terminal 10,
Reference numeral j denotes a junction between the wall through hole sealing member 9 and the metal sleeve 15, k denotes a junction between the metal sleeve 15 and the metal cladding tube 7c which is the outermost component of the electric wire 7, and l denotes a junction between the metal sleeve 15 and the metal sleeve 15. The joint, m, with the insulating material 16 indicates the joint between the insulating material 16 and the terminal 10, and the above-mentioned joints j to m are air-tightly treated with, for example, an adhesive.

In the above configuration, the reason why the outermost peripheral component of the electric wire 7 is the metal clad tube 7c is that the electric wire conductor 7a can be protected from damage by the metal clad tube 7c, and the metal clad tube 7c is excellent in heat resistance. On the basis that there is.

Thus, the metal clad tube which is the outermost layer constituent member of the electric wire 7
As described above, 7c is provided to protect the electric wire conductor 7a from damage and to prevent the heat resistance of the electric wire 7 from being impaired, and its electric potential must be kept at the earth electric potential as a matter of course. Therefore, the insulating material 7b is filled between the metal cladding tube 7c and the conductor 7a in consideration of the withstand voltage of the electric wire 7. The insulating material 7b is in the form of powder,
Since the powdered insulating material 7b is easily leaked to the outside during the terminal treatment, the end of the metal-coated tube 7c is provided with a solid plug-shaped insulating material 7d.

[Problems to be solved by the invention]

By the way, a conductor which is a central component of the electric wire 7 described above.
The distance between the outer circumferential component 7a and the metal cladding tube 7c is set to an extremely small size in consideration of, for example, flexibility in routing the electric wire 7; Problems when the dimension between 7a and the metal cladding tube 7c is minimized will be described below.

That is, in the terminal processing work of the electric wire 7, it is necessary to expose the end of the electric wire conductor 7a and connect it to the terminal 10, but at this time, the electric wire conductor 7a is attached to the wall through hole sealing member 9 The distance from the metal sleeve 15 is extremely small. If the distance between the end of the conductor 7a and the metal sleeve 15 attached to the wall through-hole sealing member 9 calculated at the time of the terminal processing operation of the electric wire 7 is minute, the electric wire 7 The insulation space 18 is also extremely small, and its withstand voltage is impaired.

In order to improve the voltage resistance of the electric wire 7, a sleeve formed of an insulating material may be used instead of the metal sleeve 15. However, the insulating material is inevitably stronger than the metal material. In order to secure the strength of the insulating sleeve at the same level as the metal sleeve 15, the thickness must be increased, and simply diverting the insulating sleeve instead of the metal sleeve 15 results in The following problems occur.

That is, in order to increase the density of the electric wires laid in the wall through-hole 3 of the reactor shielding wall, when a large number of electric wires 7, 7. The insulation space 18 allowed for each one is extremely small, and therefore, as described above, the use of a thick insulation sleeve in place of the metal sleeve 15 requires that the inside of the through hole 3 of the reactor shield wall be provided. This is counter to the increase in the density of the wires to be laid, and it is difficult to simply adopt the idea of using an insulating sleeve instead of the metal sleeve 15.

By the way, conventionally, in order to improve the insulating property of the insulating space indicated by reference numeral 18 in FIG. 4, that is, the space 18 located between the metal sleeve 15 and the electric wire conductor 7a (and the terminal 10), the insulating space indicated by reference numeral 17 in FIG. This type of structure having the insulating material shown therein has also been proposed. As an example, a method of dividing the sleeve-like insulating material 17 into two parts in the axial direction to cover the exposed portions of the wire conductor 7a and the terminal 10 is considered. However, in such a case, the slit of the insulating material 17 becomes an electric creeping portion, which causes a problem that the withstand voltage of the electric wire 7 is impaired as compared with a case where the insulating material 17 is not interposed in the space 18. .

The present invention has been made as a result of study to solve the above-mentioned problems of the prior art, and an object thereof is to lay an electric wire in a closed chamber represented by a reactor shielding wall. In the case of using wires that are excellent in preventing damage to the conductor and having heat resistance (that is, wires that have an insulating material wrapped around the wire conductor and a metal tube is coated on the wire), the wire must be used for wire termination processing. An improved electric wire capable of improving the voltage resistance of the electric wire in the through hole portion of the wall of the closed chamber without impairing the density of many electric wires even if the end of the conductor is exposed. It is an object of the present invention to provide a wall penetration structure.

[Means for solving the problem]

In order to achieve the above object, the present invention provides an insulating material on the outer periphery of a conductor, lays a plurality of electric wires formed by coating a metal tube on the outer periphery of the insulating material in a wall through hole, An outermost periphery of the electric wire, wherein the electric wire is hermetically inserted into a wall through-hole sealing member provided outside the wall through-hole and the inside and outside of the wall through-hole are air-tightly processed. A terminal for positioning an end of a metal cladding tube as a constituent member and an end of an insulating material as an inner layer member thereof in a through hole in a wall, and being connected to a conductor of the electric wire and led out of the through hole in the wall. Is hermetically sealed to the wall through-hole sealing member via an insulating sleeve including a thickness dimension corresponding to a thickness of a metal cladding tube as an outermost peripheral member of the electric wire and an insulating material as an inner layer member thereof. It is characterized by the fact that it is supported.

[Action]

Thus, the present invention has the above-mentioned configuration, that is, the end of the metal cladding tube, which is the outermost component of the electric wire, and the end of the insulating material, which is the inner layer member, are located in the through-holes in the wall, and The outer circumference of the terminal connected to the conductor and guided out of the wall through-hole is defined as a wall thickness dimension corresponding to the thickness of the metal cladding tube as the outermost peripheral member of the electric wire and the insulating material as the inner layer member thereof. The sealing member is hermetically supported by the wall through-hole sealing member via an insulating sleeve, and is connected to the wire conductor when the end portion of the wire conductor is exposed at the time of the terminal treatment of the wire. Because the metal cladding tube and the insulating material are not located at the site where the terminal that leads the terminal through the wall through hole to the outside (the position of the wall through hole sealing member), the wall thickness is increased by the margin. Using a strength-compensated insulating sleeve, It is possible to directly support the outer periphery of the terminal that is led out from the hole, and as a result, the voltage resistance of the electric wire at the wall through-hole portion of the closed chamber can be improved without impairing the density of many electric wires. It can be improved than before.

〔Example〕

Hereinafter, the present invention will be described with reference to an embodiment in which electric wires are laid on a reactor shielding wall, with reference to one embodiment of FIGS. 1 and 2. FIG. 1 shows the entire structure of the structure of the present invention. FIG. 2 is a longitudinal sectional view, and FIG. 2 is a partially enlarged view of FIG. 1 which is a main part of the present invention.

In FIG. 1, a lining 2 is provided on a reactor shielding wall 1.
The lining 2 protects the shielding wall 1 from substances harmful to the reactor shielding wall 1. A sleeve 4 for mounting a housing 5 of an electric wire penetration mechanism is attached to a wall penetration hole 3 for laying electric wires provided in the shielding wall 1. Reference numerals 6 and 6 'denote wire supports which are located in the wall through holes 3 and support the wires 7,
A filler 8 is provided between the wire supports 6, 6 '. The electric wire 7 is airtightly laid in the wall through-hole 3 via a filler 8 laid on the outer periphery thereof, and the outside of the wall through-hole 3 is sealed by the wall through-hole sealing member 9. Are sealed.

1 and 2, reference numerals 7a to 7d and 9 to 10 and 15 to 16 are the same as those described using the same reference numerals in FIG. 5, that is, 7a is a central component of the electric wire 7. The conductor 7a is shown outside the conductor 7a.
The metal tube 7c is covered with a gap between the metal tube 7c and the gap between the metal clad tube 7c and the electric wire conductor 7a is filled with an insulating material 7b made of, for example, powder ceramics. At the end of the metal cladding tube 7c, an end plug-shaped insulating material 7d made of, for example, solid ceramics is mounted, and the solid plug-shaped insulating material 7d is filled in the metal cladding tube 7c. The leakage of the powdery insulating material 7b to the outside is prevented. 10 is a terminal connected to the electric wire conductor 7a, and the terminal 10 is an insulating sleeve 11
The insulating sleeve 11 is attached to the wall through-hole sealing member 9.

In FIG. 1 and FIG. 2, the symbol a indicates the electric wire conductor 7a and the terminal 10
The symbol b indicates a junction between the sleeve 4 and the electric wire penetration mechanism housing 5, the symbol c indicates a junction between the housing 5 and the wall through-hole sealing member 9, and the junctions b and c are welded. Alternatively, airtight processing is performed by packing or the like. d is a joint between the wall through hole sealing member 9 and the insulating sleeve 11, e is a joint between the insulating sleeve 11 and the electric wire conductor 7a, and the joints d and e are hermetically sealed with, for example, an adhesive. Has been given.

In FIG. 1, the same electric wire laying means as described above is provided also on the inner wall side of the reactor shielding wall 1 indicated by the symbol X in FIG.

Thus, as is apparent from the contents shown in FIGS. 1 and 2, the present invention is directed to the end of the metal cladding tube 7c which is the outermost component of the electric wire 7 and the insulating material 7b which is the inner layer member. The outer periphery of the terminal 10 whose end is located in the wall through hole 3 and which is connected to the electric wire conductor 7a and led out from the wall through hole 3 is formed as a metal cladding tube which is the outermost peripheral component of the electric wire 7. A structure in which the wall through-hole sealing member 9 is hermetically supported via an insulating sleeve 11 including a thickness dimension corresponding to the thickness of the insulating material 7c as an inner layer member thereof, When the end portion of the wire conductor 7a is exposed during the terminal processing operation of the wire 7, a portion for guiding the terminal 10 connected to the wire conductor 7a to the outside through the wall through hole 3 (the portion of the wall through hole sealing member 9). Position), the metal cladding tube 7c and the insulating material 7b are not located at the same position. The outer periphery of the terminal 10 guided to the outside through the wall through-hole 3 can be directly supported by using the insulating sleeve 11 which is thickened and the strength is compensated. , 7,... Without impairing the increase in the density, the withstand voltage of the electric wire 7 in the wall through hole 3 of the reactor shielding wall 1 can be improved as compared with the related art.

FIG. 3 is an enlarged longitudinal sectional view of a main part showing another embodiment of the structure of the present invention. In the embodiment of FIG. This shows a case where an insulating resin layer 12 that is in close contact with the outer periphery of the terminal 10 led out is stretched. According to this configuration, the airtightness at the joint d between the wall through-hole sealing member 9 and the insulating sleeve 11 is obtained. The effect can be further ensured. The above-mentioned insulating resin layer 12 may be provided on the inner wall instead of the outer wall of the wall through-hole sealing member 9, or may be provided on the inner / outer wall.

〔The invention's effect〕

The present invention is as described above, and as is clear from the description of the illustrated embodiment, according to the present invention, when laying an electric wire in a closed chamber represented by a reactor shielding wall, it is necessary to prevent a wire conductor from being damaged. When using an electric wire with excellent heat resistance, that is, applying an insulating material to the outer periphery of the electric wire conductor and further coating a metal tube on it, exposing the end of the electric wire conductor at the end treatment of the electric wire In addition, to obtain an improved wire penetration structure of an electric wire capable of improving the withstand voltage of the electric wire in the wall penetration hole portion of the closed chamber as compared with the conventional one without impairing the high density of a large number of electric wires. Can be.

[Brief description of the drawings]

1 and 2 show one embodiment of the structure of the present invention.
FIG. 1 is a longitudinal sectional view showing the entire structure, FIG. 2 is a partially enlarged view of FIG. 1 which is a principal part of the present invention, and FIG. 3 is an enlarged longitudinal section of a principal part showing another embodiment of the structure of the present invention. FIG. 4 is a partially enlarged longitudinal sectional view of a conventional electric wire wall penetrating portion structure. 1 ... reactor shielding wall, 3 ... wall through hole, 7 ... electric wire,
7a ... conductor, 7b ... powdered insulating material, 7c ... metal clad tube,
7d: solid plug-shaped insulating material, 9: wall through-hole sealing member, 11
…… Insulation sleeve, 12 …… Insulation resin layer.

Claims (2)

(57) [Claims] 1. An insulating material is provided on the outer periphery of a conductor, and a plurality of electric wires formed by coating a metal tube on the outer periphery of the insulating material are laid in a through-hole in the wall. A wall through-hole structure of an electric wire, which is hermetically inserted into a wall through-hole sealing member provided on the outside of the electric wire and air-tightly treated inside and outside of the wall through-hole, wherein a metal coating which is an outermost component of the electric wire The end of the tube and the end of the insulating material that is the inner layer member are positioned in the through-hole in the wall, and the outer periphery of the terminal connected to the conductor of the electric wire and led out from the through-hole in the wall is connected to the electric wire. The airtight tube is hermetically supported by the wall through-hole sealing member via an insulating sleeve having a thickness dimension corresponding to the thickness of the metal cladding tube as the outermost peripheral member and the insulating material as the inner layer member. An electric wire through-wall structure. 2. The insulating resin according to claim 1, wherein at least one of the inner and outer walls of the wall through-hole sealing member is in close contact with an outer periphery of a terminal led out from the wall through-hole. The wall penetration structure of the electric wire where the layer is stretched.