JPS589474Y2 - fireproof bus duct - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a fireproof bus duct used in an emergency power circuit of firefighting equipment, etc.

Fire-resistant bus ducts must withstand use for 30 minutes after a fire occurs.

For this reason, the insulators that insulate and support the conductors inside the duct are currently made of fire-resistant insulating inorganic materials such as porcelain, ceramics, and mica, but these are extremely expensive, have poor elasticity, and are susceptible to short-circuit electromagnetic forces. There are many cases where it is easily destroyed.

In view of this fact, the present invention can be supported by an insulating material with good impact resistance when used at normal temperatures, while in an abnormally high temperature state during a fire, a fire-resistant material can be used instead of the insulating material. It has been improved so that it can be supported.

To explain the following with reference to the drawings, in Figs. 1 and 2, 1 is a steel plate duct, 2 is a rectangular conductor, and 3 is a polyethylene duct with excellent impact resistance, at least when a fire occurs. The first insulating support is made of an insulating material that is melted and dripped before being burned and carbonized by high temperature, and the second insulating support 5 is made of a fire-resistant insulating material such as porcelain or ceramic.

Therefore, the first insulating support 3 and the second insulating support 5
are respectively placed in the duct 1, and as shown in FIG. In addition to direct support, the second insulating support 5 is fixed inside the duct 1, and a gap is set between the surface facing the conductor 1 at a height higher than the inner surface of the duct 1 to ensure insulation performance. is formed.

The bus duct configured in this way is laid in preparation for the outbreak of a fire, and the state in which the conductor 2 is directly supported by the first insulating support 3 continues until the outbreak of a fire.

On the other hand, in the event of a fire, as shown in FIG. 1, the first insulating support 3 melts and drips due to exposure to high temperatures, flows out from the auxiliary support 4, and flows down to the inner surface of the duct 1. A gap is formed between the conductor 1 and the auxiliary support 4 to create an air-insulated state, and the conductor 1 is now connected to the second insulating support 3 by releasing the support from the first insulating support 3. The receiver 5 is movably engaged in the groove 5a, and the conductor 2 is supported in a fireproof and insulating manner with respect to the duct 1 via the second insulating support 5.

Therefore, during energized use for 30 minutes after the occurrence of a fire, only the second insulating support 5 supports the conductor while maintaining the fireproof insulation ability.

FIG. 3 shows an example of application of a fireproof insulating support part, in which a mica sheet 6 is applied to the groove 5a of the second insulating support 5, and a fireproof insulator such as porcelain or ceramic is applied to the conductor side. Fireproof insulation support is achieved by attaching a heat-resistant spacer 7 and engaging this spacer 7 with the surface of the mica sheet 6, which is effective in further ensuring fireproof insulation support.

In this case, when the first insulating support 3 directly supports the conductor 2, a gap is set between the spacer 7 and the mica sheet 6 as shown in the figure so that the conductor is not held. Such fireproof insulating support is performed after the first insulating support 3 is melted and dripped from a high temperature at the time of a fire outbreak.

As is clear from the above explanation (the main feature of the present invention is that under normal temperature conditions, it is possible to achieve good impact resistance without using a fireproof insulating support to support the conductor). Because it is directly supported by an insulating support made of an insulating material, it can be installed with high short-circuit strength without worrying about insulation breakdown. The insulating support that has been directly supporting the duct melts and drips, forming a gap between the conductor and the duct, creating an air-insulated state, and with the formation of this gap, the conductor moves and engages with the fire-resistant insulating support, making it fireproof. The conductor is insulated and supported, so it can be used with electricity for 30 minutes after a fire breaks out.Therefore, insulation breakdown is caused by continuing to support the conductor with a fire-resistant insulating support even before the fire breaks out. If the problem can be eliminated and the number of supports required for fireproof insulation can be reduced to less than half of the conventional number, it will be economical and provide a useful product as this type of fireproof bus duct. .

[Brief explanation of the drawing]

1 and 2 show an embodiment of the fireproof bus duct of the present invention, FIGS. 1A and B are a front view and a cross-sectional side view showing the conductor support structure before a fire broke out, and FIG. This is a conductor support structure using fireproof insulated supports after a fire outbreak. FIG. 3 is a front view showing another structural example of the fireproof insulating support part. 1...Duct, 2...Conductor, 3...
...first insulating support, 5...second insulating support.

Claims (1)

[Scope of utility model registration request] When insulating and supporting a conductor in a duct, a first insulating support made of an insulating material such as polyethylene that has good impact resistance and melts and drips before burning and carbonizing due to high temperatures when a fire occurs. is arranged to directly support the conductor, and a second insulating support made of a fire-resistant insulating material such as porcelain or ceramic and having grooves formed in the conductor supports is placed opposite to the conductor with the grooves spaced apart. When a fire occurs, the first insulating support melts and drips, creating air insulation between the conductor and the duct, and the conductor moves to the groove of the second insulating support. A fireproof bus duct characterized in that it is configured to engage with each other to provide fireproof insulation support.