JPS59181484A - Electromagnetic induction heating vessel - 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 The present invention particularly relates to containers such as pots and kerators for cooking using induction heating using a high-frequency electromagnetic generator.

Induction heating containers for electromagnetic generators that use this type of high-frequency method cannot achieve induction heating unless they are made of ferromagnetic materials such as iron, and those made of non-magnetic materials such as aluminum (alloy). In order to use this container as the above-mentioned induction heating container, it is necessary to fix a heating plate made of a ferromagnetic material to a part of the container body (usually the bottom surface). However, if the container body and the heat generating plate are carelessly fixed by common welding means, a space will be created between them, and this space will impede heat conduction from the heat generating plate to the container body. . As a result, even though the container body is made of a material such as aluminum (alloy) with high thermal conductivity, the thermal efficiency is significantly reduced when used as a cooking container or the like.

In view of these conventional circumstances, the present invention has been developed to improve heat conduction from a heat generating plate made of a ferromagnetic material to a container body made of a material with high thermal conductivity such as aluminum (alloy). The object is to provide an electromagnetic induction heater configured as follows.

In order to achieve this object, the present invention provides an outer surface of a container body made of a non-magnetic material such as aluminum (alloy);
This device is characterized in that the entire surface of the device is brazed to a heating plate made of a ferromagnetic material in close contact.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Figure 1 shows a partial cross-section of an induction heating container applied to high-frequency electromagnetic generation training (not shown), Figure 8g2 shows its bottom surface, and Figure 8g2 shows a part of Figure 1 in an enlarged cross-section. In FIG. 6, a container body 1, which is typified by a pot for a household cooking device, is made of a non-magnetic material with high thermal conductivity, such as aluminum or an alloy thereof. A heat generating plate 2 made of a ferromagnetic material such as stainless steel is mounted on the bottom surface 1a of the container body 1, and a heat generating plate 2 made of aluminum hard brazing material 6
It is soldered by. As a result, the container body 1 made of a non-magnetic material can be used as a high-frequency electromagnetic induction heating container.

Here, the working procedure for brazing the heat generating plate 2 to the bottom surface 1a of the container body 1 will be explained with reference to FIGS. 4(A) to 4(C). First, the material for the container body 1, the material for the heat generating plate 2, and the aluminum brazing material 6 are each punched out into disk shapes of predetermined dimensions and placed on a table (Fig. 41 (A).
)reference). Examples of these types and dimensions are shown in Table 1 below.
Shown below.

Table 1 Note that a representative aluminum alloy of the A1100 series is generally used as the material for the container body 1. 4 (Fig.
As is clear from A), the four circular parts 4 are formed in advance by pressing, cutting, or the like. This recess 4 has a diameter of 11f of about 150.5 in the case of the Ten Thousand Kuzu Example in Table 1 above.
The depth is approximately Q, 5 tsm. However, the heating plate 2 is a flat design of the container body 1.
In some cases, it is soldered to J, and in this case, it is
+(4 is of course unnecessary. However,
It is preferable to process these four parts 4 and make the bottom surface 1a of the container body 1 flat as shown in FIGS. 1 and 6 in the state where the hot plate 2 and the hot plate 2 are joined together.

Furthermore, 5US430, which is the material of the heat generating plate 2, is a ferritic stainless steel, which is inexpensive and has excellent corrosion resistance when compared to austenitic stainless steel.

Furthermore, A404, which is the aluminum hard soldering material mentioned above,
Although No. 5 has a high melting point, it has excellent bonding strength and corrosion resistance. Its chemical composition is shown in Table 2 below.

Table 2 Now, each member shown in FIG. 4(A) needs to be cleaned for the purpose of removing dirt and foreign matter and degreasing as a pretreatment for brazing the parts. To describe this specifically, regarding the aluminum (alloy) that is the material of the container body 1,
Perform 4 complete cleanings after immersion in Triclean, or chemical treatment cleaning using nitric acid solution. Stainless steel, which is the material of the heating plate 2, is cleaned with nitric acid, and the aluminum hardening material 6 is cleaned with a weak alkaline solution.

Next, flux (
A fluoride solvent) is applied to both the raw material side of the container body 1 and the aluminum hardening material 3.

As is well known, flux is generally used in the form of a dry powder, which is kneaded with distilled water to form a beanute, and this is then applied thinly to the soldered joint. This flux particularly improves the wetting properties of the brazing material, which improves the wetting properties of the brazing material, resulting in a durable brazed joint.
Furthermore, when a fluoride solvent is used, there is no need to wash the flux of the brazed area after soldering.

After applying flux to predetermined locations as described above, the material of the heat generating plate 2 is placed on the four parts 4 formed on the material of the container body 1 with the aluminum brazing material 6 interposed therebetween. In this state, as shown in FIG. 4(B), place these on the base 11 of the dedicated tightening jig 10 and screw in several bolts 12, so that the material of the heat generating plate 2 is attached to the container. It has risen from the material of main body 1, so set it so that it does not shift. However, the fastener 10 may be a ready-made clamping fitting or the like.

In the state shown in FIG. 41(B), in order to obtain good adhesion of the entire surface of the brazed portion, it is preferable to heat it at about 200° C. by passing it through a special drying oven using a conveyor gutter (not shown). First, remove the water contained in wax. Subsequently, by bending the heating rectangle for brazing, the heating temperature is approximately 577°C to 650°C (preferably approximately 600°C).
Heat for about 1 to 15 minutes (preferably about 2.6 minutes). This is the heating temperature and time required to properly melt the aluminum brazing material 6 as the component. As a result, as shown in FIG. 4(C), the heat generating plate 2 is soldered to the bottom surface 1a of the container body 1 in a state in which the entire surface is in close contact with the bottom surface 1a without any gaps.

Thereafter, in this embodiment, the material of the container body 1 is formed into the shape shown in FIGS. 1 to 6 by press drawing or the like. Thereafter, if necessary, the surface of the container body 1 is finished by, for example, anodizing, painting, or enameling.

Note that the drawing process of the container body 1 may have already been completed at the time of FIG. obtain.

Further, in the above embodiment, the heat generating plate 2 is connected to the bottom surface 1 of the container body 1.
Although we have described the most preferable case where a is brazed to a,
It is also possible to braze the heat generating plate 2 to the outer surface of the container body 1 or to the entire outer surface of the container body 1 in a state of close contact with the entire surface.

As mentioned above, this invention can be applied to aluminum (!

By soldering the container body made of a non-magnetic material such as Takeno's alloy and the hot plate made of ferromagnetic material on the entire surface in close contact, the container body made of aluminum (alloy) can be heated by high-frequency electromagnetic induction. Not only can it be used as a heating container, but it also maintains good thermal conductivity from the heating plate to the container body, resulting in good thermal efficiency when used as a cooking container.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view showing a part of the electromagnetic induction heating container in cross section, FIG. 2 is a bottom view of FIG. FIGS. 4(A) to 4(C) are cross-sectional views showing a partially enlarged cross-sectional view showing the working procedure for soldering the container body and the heat-generating plate. 1... Container body 1a... Bottom surface 2... Heat generating plate 6... Aluminum hard brazing material

Claims (1)

[Claims] The outer surface of the container body made of a non-magnetic material such as aluminum or aluminum alloy and the heat generating plate made of a strong, magnetic material are welded together by heating with a brazing material interposed between them so that the entire surface is in close contact with the outer surface of the container body. An electromagnetic induction heating container characterized by: