JPH08336226A - Bus duct with electromagnetic shielding function - Google Patents

Abstract

PURPOSE: To block a detrimental electromagnetic noise propagating through a bus duct by constituting an electric circuit, corresponding to an electromagnetic noise filter in a bus duct where feeder conductors are disposed in a conductive housing while being supported by an insulating material. CONSTITUTION: A feeder conductor 3 is supported by an insulating support 5 on the inside of a housing 4 and capacitors 1 are disposed between annular reactors 2 or on the opposite sides thereof thus forming an LC circuit for the feeder conductor 3. A bus duct 9 is passed through a corner of an electromagnetic shield room 8 and a bus duct 10 having electromagnetic shielding function is disposed at the part where the bus duct 9 penetrates the electromagnetic shield room 8. This structure blocks a detrimental electromagnetic noise propagating through the bus ducts 9, 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention prevents harmful electromagnetic wave noise propagating in a bus duct by constructing an electric circuit corresponding to an electromagnetic wave noise filter in a bus duct used for supplying power to an electromagnetic wave shield room. The present invention relates to a bus duct having an electromagnetic wave shielding function.

[0002]

2. Description of the Related Art A so-called intelligent system having a new function so as to meet a high level of telecommunications demand inside and outside a company by constructing an optical fiber network and a satellite earth station in a building Bill is in the limelight. These electronic circuits and devices are vulnerable to unnecessary electromagnetic waves, so-called noise, and noise causes troubles in the electronic circuits and electronic devices, which is a major cause of malfunction. On the other hand, due to the recent development of electric and electronic technologies, especially digital technology, the amount of electric and electronic equipment has been remarkably increased, and harmful electromagnetic waves are continuously generated from these electric and electronic equipment. This harmful electromagnetic wave, so-called noise, not only affects the electronic circuit network or electric and electronic devices of each other flying over the air extremely easily, but also intercepts the electromagnetic wave, which may cause leakage of confidential information. .

Therefore, in the above-mentioned intelligent building, the harmful electromagnetic waves that try to enter from the outside are shielded so that the electronic circuit network and the electronic equipment are not disturbed by the electromagnetic waves, and the electromagnetic waves generated inside are exposed to the outside. It is essential to have a dedicated electromagnetic wave shielded room for the purpose of preventing leakage. Therefore, it is common practice to enclose a target section with a conductor plate member and ground the plate member to prevent harmful electromagnetic waves from entering and exiting.

On the other hand, a power source is indispensable for operating the electronic circuit network, electricity, and electronic equipment even inside the electromagnetic wave shielded room where electromagnetic waves are shielded.

However, when an electric power is to be supplied to the shielded room by penetrating the electromagnetically shielded room, the bus duct conventionally used for power feeding is a covering material made of a metal plate in which a power feeding conductor is supported by an insulating material. Therefore, it was only formed into a cylindrical duct. The duct body is weather resistant,
Insulation and mechanical protection are required, but electromagnetic wave shielding is not particularly required.

[0006] Such a bus duct structurally serves as a coaxial waveguide, and the power feeding conductor in the bus duct serves as a medium to propagate electromagnetic noise. Therefore, if power is supplied to the shielded room using a normal bus duct, it may cause intrusion or leakage of harmful electromagnetic waves.

Therefore, in order to prevent this, it was necessary to disconnect the bus duct once and connect the filter. In particular, when power is supplied to the electromagnetic wave shield room, it is necessary to install the electromagnetic wave noise filter and the installation place in the shield wall penetrating portion.

Therefore, in the present invention, an electric circuit corresponding to an electromagnetic wave noise filter is constructed inside the bus duct to provide a bus duct having an electromagnetic wave shielding function for preventing propagation of harmful electromagnetic wave noise propagating in the bus duct. With the goal.

[0009]

[MEANS FOR SOLVING THE PROBLEMS] An electric circuit corresponding to an electromagnetic noise filter is provided inside a bus duct in which a feeding conductor (bus bar) supported by an insulating material is arranged while being covered with a conductive outer cover. Electromagnetic wave shielding, which is configured by forming a reactor by penetrating a feeding conductor (bus bar) into an annular body made of a high magnetic permeability material, connecting the reactor and a capacitor, and forming an electric circuit corresponding to an electromagnetic noise filter. Form a bus duct with functions.

[0010]

The feeding conductor (bus bar) in the bus duct is passed through an annular body made of a high magnetic permeability material such as ferrite to form a reactor, and capacitors are connected to both ends or one end of the LC circuit. By configuring the above, the inside of the bus duct becomes a circuit corresponding to an electromagnetic noise filter, and the electromagnetic waves propagated by the bus duct can be reliably shielded.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A bus duct having an electromagnetic wave shielding function of the present invention will be described below with reference to the drawings.

FIG. 1 is a detailed vertical sectional view of a bus duct having an electromagnetic wave shielding function according to the present invention, and FIG. 2 is a horizontal sectional view thereof. The outer cover 4 that houses the power supply conductor (bus bar) 3 is formed of a material having excellent conductivity, and the outer cover 4 is screwed via a shield gasket 7 so as to surround the power supply conductor 3 with a plate material for four rounds. ing. The power supply conductor 3 is supported inside the jacket 4 by an insulating support 5, and the annular reactor 2 made of a high magnetic permeability material such as ferrite is also supported inside the jacket 4 by a reactor support 6. There is.

The power feeding conductor 3 is configured to pass through the annular reactor 2, and the feeding conductor 3 is provided between the annular reactors 2 and 2 or on both sides of the annular reactor 2 with the capacitor 1 interposed therebetween. By arranging L
An electric circuit corresponding to an electromagnetic noise filter can be formed in the bus duct 9 by forming a -C circuit. FIG.
The bus duct 9 penetrates one corner of the electromagnetic wave shield chamber 8, and the bus duct 10 having an electromagnetic wave shielding function is arranged in a portion where the bus duct 9 penetrates the electromagnetic wave shield chamber 8.

It should be understood that the connecting portions in the longitudinal direction of the outer jackets 4 are also screwed together via the shield gasket 7.

When the outer cover 4 is attached to the conductor plate member of the electromagnetic wave shield chamber 8, the outer cover 4 is fixed by screwing it through a fixing member having good conductivity, welding or soldering, or a braided wire. It

According to the present invention, the bus duct 10 is provided with an electromagnetic wave shielding function for electromagnetic waves propagating in and out of the bus duct 9.
However, it acts as an electromagnetic noise filter and shields harmful electromagnetic noise.

FIG. 4 shows an equivalent circuit formed by a bus duct having an electromagnetic wave shielding function.

[0018]

EFFECTS OF THE INVENTION A power supply conductor (bus bar) supported by an insulating material is penetrated through an annular body made of a high magnetic permeability material while being covered with a conductive outer cover to form a reactor, and the reactor and the capacitor. Since the electric circuit corresponding to the electromagnetic noise filter is formed inside the bus duct by connecting the above, there are the following effects.

1. If this bus duct is used for supplying power to the electromagnetic wave shielded room where the electromagnetic wave noise does not go in and out, the electromagnetic wave noise can be prevented from entering and leaking.

2. Since electromagnetic wave noise can be prevented from entering and leaking out without using an electromagnetic wave noise filter as in the conventional case, the electromagnetic wave filter is not required to be installed and its installation place is required.

3. Power can be supplied in a small space.

[Brief description of drawings]

FIG. 1 is a detailed vertical sectional view of a bus duct having an electromagnetic wave shielding function of the present invention.

2 is a cross-sectional view of FIG.

FIG. 3 shows a bus duct 1 having an electromagnetic wave shielding function of the present invention at a portion where a bus duct 9 penetrates one corner of an electromagnetic wave shield chamber 8 and the bus duct 9 is inserted into the electromagnetic wave shield chamber 8.
It is the figure which arranged 0.

FIG. 4 is a diagram showing an equivalent circuit formed by a bus duct having an electromagnetic wave shielding function.

[Explanation of symbols]

1 ... Capacitor, 2 ... Annular reactor, 3 ...
・ Feeding conductor (bus bar), 4 ... Jacket, 5 ... Insulating support, 6 ... Reactor support, 7 ... Shield gasket, 8 ... Electromagnetic shield room, 9 ... Bus duct 10: Bus duct with electromagnetic wave shielding function

Claims (2)

[Claims] 1. An electric circuit corresponding to an electromagnetic noise filter is formed inside a bus duct in which a power supply conductor (bus bar) supported by an insulating material is arranged while being covered with a conductive outer cover. A bus duct equipped with an electromagnetic wave shielding function. 2. A reactor is formed by penetrating a feeding conductor (bus bar) through an annular body made of a high magnetic permeability material, and connecting the reactor and a capacitor to form an electric circuit corresponding to an electromagnetic noise filter. A bus duct having an electromagnetic wave shielding function according to claim 1.