JPS6295898A - Heat prevention of cubicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for preventing heat generation due to electromagnetic induction in a case made of iron or the like.

[Conventional technology]

Some use a ferromagnetic material such as iron as a housing. For example, the housing of an induction heating device is one of them. Since the induction heating device generates an alternating magnetic field around the main body of the induction heating device, an eddy current is generated within the casing due to electromagnetic induction and heat is generated in the casing surrounding the main body of the induction heating device.

To prevent this, conventionally, as shown in Figure 3,
Wrap the copper foil 12 around the casing 11, and solder the edges of the copper foil 12.
It was fixed at 3rd class.

[Problem that the invention seeks to solve]

By the way, there is a large casing for an induction heating device, which has dimensions of about 2 m in height, about 3 m in width, and about 1.5 m in depth. If the casing is large or has a complicated structure, the conventional method of wrapping copper foil around the casing and soldering it would be extremely time-consuming and require complete removal of the casing. The drawback was that it could not be covered.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for preventing heat generation of a casing, which can completely cover the casing in a short time even when the casing is large or has a complicated structure.

[Means for solving problems]

The method for preventing heat generation of a housing according to the present invention is characterized in that copper powder of one grain size different from the paint is mixed into a coating for wrapping a copper foil around the housing, and this is applied to the surface of the housing.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram for explaining an embodiment of the method for preventing heat generation in a casing according to the present invention. The housing 1 in this embodiment is
The casing of the induction heating device has, for example, dimensions of approximately 2 m in height, approximately 3 mp in width, and approximately 1.5 m in depth. The iron plate that makes up the housing 1 is L-shaped, and the length of the - side is approximately 4.
cIrL and has a thickness of approximately 4 mm. The two drawings are
Only the corner portion of the housing l is shown.

2 is a paint mixed with copper powder, 2 For example, 2 is a commercially available paint for metal parts made of synthetic resin and an organic solvent, and 1 is a relatively coarse first copper fine powder (particle size of 50 to 200 μm) and a particle size of of relatively thin second fine copper powder (particle size is 30 μm or less).
:1 mixture. This copper powder mixed paint 2 is sprayed onto the housing 1 through its spray nozzle 3a using a coating compressor 3.

The reason for using two different particle sizes of copper powder mixed into the paint is to increase the effect of preventing heat generation on the surface of the casing 1, as shown in Figure 2. Coarse first fine copper powder 2a is mixed.

The second fine copper powder 2b having a small particle size was used to cover the surface of the casing without any gaps. However, it goes without saying that the particle size of the first fine copper powder 2a is selected to be no larger than the diameter of the nozzle 3a of the compressor 3.

Next, FIG. 4 shows measurement results for comparing the heat generation prevention effects of the present invention and the conventional example. Here, the two inventions are:
Samples were prepared by spraying copper powder-containing paint onto a 2111 mm thick iron plate using a compressor at varying thicknesses in the range of 100 to 500 μm. The thickness of the copper foil on the iron plate is 200-50mm
Samples were prepared by wrapping different wires in a range of 0 μm and soldering them. In FIG. 4, the horizontal axis is the coating thickness or the thickness of the copper foil, and the vertical axis is the heat generation prevention effect. The heat generation prevention effect is measured by the difference between the temperature 'ro before heat generation and the temperature T1 after heat generation when the surface of the iron plate is not covered with anything.

Ratio (ΔT
−δT)/ΔT was used. Here, δT is the rising temperature of each sample.

As is clear from Fig. 4, in the present invention, the coating thickness is 30 mm.
Approximately 90% heat generation prevention effect is achieved at 0μm, and 400μm
It can be seen that when coated to a thickness of more than m, the effect is comparable to that of conventional copper foil wrapping.

Although the above embodiment describes an example in which the paint containing copper powder is sprayed using a compressor, the paint containing copper powder may also be applied uniformly with a spatula.

〔Effect of the invention〕

As is clear from the above description, there are two aspects of the present invention.

By applying copper powder, even if the casing is large or has a complex structure, the casing can be easily and completely covered in a short time, preventing heat generation in the casing. There is an effect.

[Brief explanation of drawings]

The first diagram is a diagram illustrating an embodiment of the method for preventing heat generation in a housing according to the present invention, and the second diagram is a diagram showing an example of the shape of the copper and powder coated on the surface of the housing in Figure 1. Figure 1 is an enlarged view of part A, Figure 3 is a perspective view showing the housing part to which the conventional housing heat generation prevention method has been applied, and Figure 4 is an example of the heat generation prevention effect of the present invention and the conventional housing. It is a diagram. 1... Housing, 2... Copper powder mixed paint, 2a... Fine copper powder with coarse particle size, 2b... Fine copper powder with fine particle size, 3.
...Compressor + 3 a...Injection nozzle.

Claims (1)

[Claims] 1. A method for preventing heat generation in a casing made of iron or the like due to electromagnetic induction, the method comprising applying a paint containing copper powder of different particle sizes to the surface of the casing.