JPH0140246Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a power receiving and distribution board that houses switches, transformers, controllers, etc. used in the supply, distribution, and branch points of various electrical circuits and protects them from wind, rain, snow, cold, damage, etc. Regarding BOTS.

Conventional switchboard boxes consist of a housing body and an opening/closing door that are formed from a relatively thin steel plate of approximately 1.6 to 3.2 mm, and these surfaces are only painted and colored for appearance and rust prevention purposes. It was hot. However, when this conventional type is left outdoors, it is cooled to below 0℃ in the winter, and the temperature inside the case rises to 60-80℃ due to hot air over 30℃ in the summer. When painting with rust paint, it begins to peel off in about two years due to thermal distortion of the thin steel plate, and then red rust develops and corrosion progresses, forming corrosion holes in about four years (see Figure 1).

Damage to the power distribution board box due to these corrosive atmospheres and humidity does not only result in peeling of paint and deterioration of the appearance due to red rust on thin steel plates, but also impairs the function of electrical equipment.If the situation worsens, rainwater may enter through the corrosion holes. This was also a cause of electrical leakage and short circuit accidents. Moreover, these phenomena tend to cause deterioration and corrosion to progress more quickly in locations near the coast, in industrial areas, and in areas with heavy traffic. As another anti-corrosion surface treatment method, Japanese Patent Application Laid-Open No. 52-90432 describes an aqueous solution containing one or more types of metal ions such as nickel or silicate.
A method is described in which a coating film is coated by applying an aqueous solution in which oxide colloid is dispersed as a subcomponent and then passing it through a heating furnace. A method of applying a salt film, a primer coating layer, and a water-based lubricant film is described, and JP-A-57-83710 also describes a method of applying a treatment agent containing fine metal zinc particles and a trivalent chromium compound. Heat to 330° to create a rust-preventive coating layer.
A method is described in which a polymer is applied to this surface and sintered to form a lubricating coating. Furthermore, a method of galvanizing by dipping in zinc has been known for a long time.

However, the method described in JP-A No. 52-90432, the method described in JP-A-57-83710, and the method of dipping in zinc are heated and fired at high temperatures, and are not practical for sheet materials such as steel plates or bolts. However, in the case of half-finished switchboard boxes that are box-shaped to house switches, transformers, controllers, etc., and have a door attached, the box body may be thermally deformed due to the heat generated by the process, resulting in size problems. It is difficult to use for anti-corrosion treatment after box molding because it distorts the structure and causes backlash. Also Tokukaisho
As in the inventions described in No. 52-90432 and JP-A No. 50-62145, coatings on zinc/metallic layers generally do not adhere well and tend to peel off during thermal deformation, and peel off due to outdoor temperature changes. This causes rust.

The present invention aims to provide a power receiving and distribution board box that solves these problems.

This idea involves coating the inner circumferential surface of a casing 1 manufactured by processing and forming a thin steel plate with an insulating rust-preventing paint 2, and forming a thermal spray layer 3 on the outer circumferential surface by thermally spraying zinc and aluminum alloy. This relates to a power receiving and distribution board box characterized in that it is coated with anti-rust paint 4.

In the figure, 5 is the housing body, 6 is the opening/closing door, 7 is the door opening/closing handle, 8 is the viewing window, 9 is the paint peeling part, 1
0 is a red rust occurrence area, 11 is a corrosion hole, 12 is a base surface roughened by gritplast on the surface of the casing 1, 13 is a base paint, and 14 is a colored paint. The sprayed layer 3 of the present invention may be a sprayed layer made of only zinc, a sprayed layer made only of aluminum, or a sprayed layer made of a zinc alloy or an aluminum alloy, and includes these. It goes without saying that the power receiving and distribution board box of the present invention can be used indoors or as a casing for other electronic equipment.

In this design, the outer peripheral surface of the casing 1, which is directly exposed to wind, rain, heat, sunlight, seawater, sulfuric acid gas, and exhaust gas, is first coated with a thermally sprayed layer 3 of zinc and aluminum alloy, and then an insulating layer is coated on top. By painting with the anti-corrosion paint 4, not only the peeling of the anti-rust paint 4 can be suppressed, but also the occurrence of rust is significantly weakened, making it possible to withstand use for many years and under adverse environments. For example, with conventional retractable switchgears for outdoor electric lights that are painted only, a considerable amount of red rust will develop on the bottom and lower part of the retractable fan after being used for about three years. 5 in Kikan
Even if it had been left outdoors for a year, there was hardly any rust, other than water scale on the bottom. Furthermore, the inner peripheral surface of the housing 1, which has a relatively good environment, is also coated with the insulating rust-preventing paint 2, so that the inner surface is also rust-proofed and, in addition, the electrical insulation is improved.

As described above, according to the present invention, by adopting the structure having the above characteristics, it was possible to significantly suppress the peeling of paint and the occurrence of rust and corrosion, thereby making it possible to sufficiently withstand use for many years. . Further, since the sprayed layer of the present invention is applied only to the outer circumferential surface and not to the inner circumferential surface, the thermal spraying work is easy and can be manufactured at low cost.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing a conventional switchboard box used outdoors for four years, Figure 2 is a perspective view of the switchboard box of the present invention, Figure 3 is a cross-sectional view of the same, and Figure 4 is a conventional switchboard box. FIG. 5 is an enlarged sectional view showing the casing wall of the present invention. 1: Housing, 2: Antirust paint, 3: Thermal spray layer, 4: Antirust paint.

Claims (1)

[Scope of utility model registration request] The inner circumferential surface of the casing 1, which is manufactured by processing and forming a thin steel plate, is coated with an insulating rust-preventing paint 2, and the outer circumferential surface is thermally sprayed with zinc and aluminum alloy to form a thermally sprayed layer 3. A power receiving and distribution board box characterized by being coated with Rust Paint 4.