JP2001069648A - Fireproof bus duct connecting section - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect the surface of an insulator, without allowing conductive toxic substances to stick to the surface of the insulator in case of a fire by lining up conductor connections in respective phases between duct joints via an insulating spacer inbetween, connecting the duct joints together using bolts, and fixing a member made of a high-temperature foaming material on the inner surface of a protective cover in contact. SOLUTION: Conductor connection 10 and 10' of respective phases are lined up between the joints 3 and 4 of left and right ducts with fireproof insulating spacers 5 and inorganic fireproof separators 11 (between phases) and 12 (to the ground), and the space between the duct joints 3 and 4 is tightened using a penetrating inorganic insulating bolt 9. A member 13 and 13' made of a high- temperature foaming material is fixed on the inner surface of a protective cover 2 and 2' in contact. In case of fire, as a result, the protective cover 2 and 2' is exposed to high temperatures, and the member 13 and 13' of high- temperature foaming material immediately foam due to the high temperature to prevent toxic substances from sticking to the surface of insulators. Thus, the connection can be used under a state of high degree of insulation maintained and enables energization use in case of a fire.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bus duct connection having a fireproof structure.

[0002]

2. Description of the Related Art Fireproof bus ducts used as emergency trunk lines in buildings, factories, hospitals, and the like apply an inorganic insulating material (tape) to conductors so that power can be continuously supplied even in the event of a fire ( Although it has a wound-up structure, the connection portion is often formed of a component formed by molding an insulator that can withstand high temperatures. Even when using an insulating material that uses inorganic insulators such as mica and insulators, soot and harmful gases may enter through the gap between the duct housing and the housing during combustion, and these may enter the surface of the insulator. Adhesion causes insulation failure, and in some cases, shifts to ground fault or short circuit.

FIG. 3 shows a connection portion of a conventional fire-resistant bus duct. The fire-resistant bus ducts 1 and 1 '(duct housing; housing) connected to each other have inorganic fire-resistant insulation-treated conductors 10 and 10' at their terminals. Are exposed, and the conductor exposed portions formed at the ends are overlapped for each phase to form conductor connection portions for each phase. The conductor connection portions between the adjacent conductor connection portions and on both outer sides and the duct joint 3 are formed. , 4, a fire-resistant insulating spacer 5 for inter-phase and ground-fault insulation and inorganic fire-resistant separators 6, 7 ′ for ensuring creepage distances are passed between both duct joints 3, 4. The connection is made by tightening together with the inorganic insulating bolt 9 and the nut. Further, protective covers 2, 2 'are placed on the upper and lower sides of the duct. Reference numeral 8 denotes a disc spring.

[0004]

Recently, the connection portion of the above-mentioned fire-resistant bus duct has a structure that is as compact as the bus duct body as shown in FIG. Most of the conductors are insulated with an inorganic material mainly composed of mica sheet or mica tape. However, at the conductor connection part, the charged part is exposed at various places, and this is placed in the space inside the duct connection part; housing. ing. In addition, because of the compactness, the creepage dimension between the phases and the ground cannot be long. Under such circumstances, when a conductive harmful substance such as a carbide at the time of a fire as described above adheres, a power failure accident is likely to occur. Power outages in the event of a fire are serious accidents involving human lives and must be avoided.

[0005] As described above, the connection portion of the conventional fireproof bus duct is not structured to cope with the adhesion of the conductive substance to the insulator, and therefore this point must be solved.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a connection structure for a fire-resistant bus duct that can protect the surface of an insulator in the event of a fire without causing the conductive harmful substances described above to adhere to the surface of the insulator. It is in.

[0007]

According to the present invention, there is provided a connection structure for a fire-resistant bus duct provided by the present invention, in which conductor connection portions of each phase are connected between left and right duct joints via insulating spacers, and the space between the duct joints is bolted. Tighten and connect, a member of a high-temperature foaming material is fixed to the inner surface of the protective cover in a structure in which the protective cover is covered from above and below, and the member of the high-temperature foaming material is foamed by high heat at the time of fire. The surface of the refractory insulating spacer is quickly covered with a foamed member so that harmful substances such as soot do not adhere to the surface of the insulator. Further, since the gap in the duct housing is filled with the foamed member, a heat insulating effect can be exhibited.

As the member of the high-temperature foaming material, a molded member made of silicon rubber containing aluminum hydroxide, magnesium hydroxide, and powdered phosphoric acid frit is suitable.
However, it can also be used in the form of paint.

The member of the high-temperature foamable material;
By providing a gap without contacting the adjacent fireproof insulating spacer via the conductor connection part of each phase and the conductor connection part,
Normal heat dissipation can be improved.

According to the present invention, there can be provided a structure in which a high-temperature foaming silicone rubber is filled in a groove surrounded by a refractory insulating spacer adjacent to the conductor connecting portion of each phase with the upper and lower surfaces as bottoms.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment of a connection structure of a fire-resistant bus duct according to the present invention by a cross-sectional structure.

The basic structure of the fire-resistant bus duct and the connecting portion of this embodiment is the same as the fire-resistant bus duct and the connecting portion of FIG. Therefore, the same portions as those of the refractory bus duct and the connecting portion in FIG. 3 are denoted by the same reference numerals as those assigned thereto, so that the above description regarding FIG. 3 is also referred to.

The fire-resistant bus duct connecting portion of this embodiment includes a conductor connecting portion 1 of each phase between the left and right duct joints 3 and 4.
0, 10 'are connected via a fire-resistant insulating spacer 5 and inorganic fire-resistant separators 11 (between phases), 12 (between ground), and an inorganic insulating bolt 9 which penetrates the left and right duct joints 3, 4 via a disc spring 8; By tightening between the duct joints 3 and 4 with nuts, conductor connection portions of each phase; conductor 1
A structure in which the overlapping portions of 0, 10 'are tightened and connected, and the upper and lower protective covers 2, 2' are covered to form a housing; the inner surfaces of the protective covers 2, 2 'are made of a high-temperature foaming material. Member: Molded members 13 and 13 ′ made of silicon rubber containing aluminum hydroxide, magnesium hydroxide, and powdered phosphoric acid frit are fixed in contact with each other.

A member of the high-temperature foamable material; molded member 1
3, 13 'are provided with gaps without contacting the adjacent refractory insulating spacer 5 and inorganic refractory separators 11 and 12 via the conductor connection portions 10 and 10' of each phase and the conductor connection portions. The heat dissipation is kept good.

The surfaces of the inorganic refractory separators 11 and 12 of this embodiment are provided with a surface treatment layer made of a foamable insulating material made of aluminum hydroxide, magnesium hydroxide, silicon rubber or the like.

In the fire-resistant bus duct of this embodiment, the members 13, 13 'made of a high-temperature foaming material are used in a normal use condition.
Does not touch the conductor connection portions 10 and 10 ′ of each phase, the refractory insulating spacer 5, and the inorganic refractory separators 11 and 12, and has a gap in the housing. It has good radiation and can be used with electricity.

On the other hand, at the time of fire, the protective covers 2, 2 'are exposed to high heat, and the members 13, 13' made of a high-temperature foaming material in contact with the protective covers 2, 2 'immediately foam at high heat, and this foaming occurs. A housing whose members are surrounded by left and right duct joints 3 and 4 and upper and lower protective covers 2 and 2 ′; a gap in the housing is filled and an insulator; the surface of the fireproof insulating spacer 5 and the inorganic fireproof separators 11 and 12 are quickly formed. Because of the covering, harmful substances such as soot and harmful gas can be prevented from adhering to the surface of the insulator, and the power can be used during a fire while maintaining high insulation. Further, since the foamed member fills the gap in the housing, a heat insulating effect can be exhibited, and the protection function works for a predetermined time.

FIG. 2 shows a second embodiment of the fire-resistant bus duct connecting portion according to the present invention by a cross-sectional structure.
The fire-resistant bus duct connecting portion of this embodiment is the first embodiment; in the fire-resistant bus duct connecting portion of FIG. 1, the upper and lower surfaces of the conductor connecting portions 10 and 10 'of each phase are bottoms and the adjacent fire-resistant insulation is provided via the conductor connecting portion. A structure in which a groove surrounded by spacers 5 is filled with high-temperature foamable silicone rubber 14 is added. By doing so, it covers up the live part of the conductor connection part,
Since the exposed portion of the charged portion can be reduced, the protection from harmful substances such as soot can be further enhanced.

[0019]

As described above, according to the present invention, it is intended to provide a fire-resistant bus duct connection portion capable of protecting an insulator surface in the event of a fire without causing conductive harmful substances to adhere to the surface of the insulator. Can be achieved, and the conventional fire-resistant bus duct connection can be dealt with only by replacing the protective cover, which is of great practical value.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a fire-resistant bus duct connecting portion according to the present invention.

FIG. 2 is a cross-sectional view showing a second embodiment of the fire-resistant bus duct connecting portion according to the present invention.

FIG. 3 shows an example of a conventional fire-resistant bus duct connection part,
(A) is a plan view with the top cover removed, (B) is a front view, and (C) is a cross-sectional view.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Duct 1 'Duct 2 Cover (upper surface) 2' Cover (lower surface) 3 Duct joint 4 Duct joint 5 Fireproof insulating spacer 8 Disc spring 9 Inorganic insulating bolt 10 Inorganic insulated conductor 10 'Inorganic insulated conductor 11 Inorganic refractory separator (surface) Foaming material treatment) (interphase) 12 Inorganic refractory separator (surface foaming material treatment) (ground) 13 High temperature foaming member 14 High temperature foaming silicone rubber

Claims (4)

[Claims] 1. A protective cover having a structure in which a conductor connecting portion of each phase is connected between left and right duct joints via an insulating spacer, and the duct joints are tightened and connected with bolts to cover the protective cover from above and below. A fire-resistant bus duct connection where a member made of a high-temperature foaming material is in contact with and fixed to the inner surface. 2. The fire-resistant bus duct connection according to claim 1, wherein a molded member made of silicon rubber containing aluminum hydroxide, magnesium hydroxide, and powdered phosphoric acid frit is used as the member of the high-temperature foamable material. 3. A member made of the high-temperature foamable material;
The fire-resistant bus duct connection part according to claim 1 or 2, wherein a gap is provided without being in contact with the adjacent fire-resistant insulating spacer via the conductor connection part of each phase and the conductor connection part. 4. The fire-resistant material according to claim 1, wherein the upper and lower surfaces of the conductor connection portion of each phase are bottomed, and a groove surrounded by a fire-resistant insulating spacer adjacent through the conductor connection portion is filled with high-temperature foamable silicone rubber. Bus duct connection.