JPH0869868A - Heating container for electromagnetic cooker - Google Patents

Abstract

(57) [Summary] [Object] To obtain a heating container for an electromagnetic cooker which is heated by electromagnetic induction, in which a predetermined output can be easily obtained and in which a heating layer does not rust. In an electromagnetic cooker in which a heating container 1 made of aluminum or an aluminum alloy is installed on the upper surface corresponding to the electromagnetic induction heating coil 5, and the heating container is heated by Joule heat by eddy current, A heat generating layer 2 of 300 μm to 600 μm is formed on the outer bottom surface and the outer periphery of the lower portion of the side surface by thermal spraying in a metal powder inert atmosphere having a particle size distribution of 200 mesh to 325 mesh and made of a magnetic material such as iron.
Further, a rust preventive layer 4 made of a heat resistant resin is provided on the surface of the heat generating layer 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating container used in an electromagnetic cooker.

[0002]

2. Description of the Related Art An electromagnetic cooker heats a heating container installed above the electromagnetic induction heating coil by Joule heat by eddy current. Generally, the heating container is iron, S
Although a magnetic container made of US430 series stainless steel or the like is widely used, it is heavy and difficult to handle, and a lighter aluminum container has been demanded. However, since the aluminum container itself is a non-magnetic material and is not heated by electromagnetic induction, a magnetic iron or SUS430 series stainless steel plate is attached to the aluminum container by brazing or the like. Further, as a method of attaching a magnetic material to this aluminum container, there is a thermal spraying method which can be easily attached to containers of various shapes. As a method of attaching a magnetic material to this aluminum container by a thermal spraying method, conventionally, an inclined groove is provided in advance on the outer bottom of the aluminum container so that iron is sprayed, and measures are taken to prevent peeling (Actual Publication No. 61-
No. 27107) or a magnetic material such as iron having a thickness of 0.33 to 0.80 mm provided on the bottom of an aluminum container by thermal spraying, and an aluminum layer having a thickness of 0.62 on the surface of the magnetic material by thermal spraying.
There has been proposed a device having a thickness of 0.20 mm to prevent rust and improve heat generation efficiency (Japanese Utility Model Publication No. 3-38798).

[0003]

The method of brazing an iron or stainless steel plate to an aluminum container has a problem that the size and shape of the heating container are limited and peeling occurs. Also, in the case of forming an exothermic layer by spraying metal powder such as iron by providing inclined grooves in an aluminum container, it is difficult to mold the grooves and it is difficult to produce the required output by thermal spraying, which causes uneven performance. There is. Further, in the case where a magnetic body and an aluminum layer are formed on the bottom of an aluminum container, it is difficult to control the dimensions of the magnetic body and the aluminum layer, and if the control is not successful, abnormal heat generation occurs.

[0004]

In the present invention, therefore, the heating for an electromagnetic cooker is simple to manufacture, the required output is easily obtained by electromagnetic induction heating, and the temperature distribution of the heating container is uniform and the control is accurate. It is intended to provide a container.

As a concrete means thereof, the present invention has a particle size distribution of 200 mesh to 325 on the outer bottom surface and the outer periphery of the lower side surface of the heating container made of aluminum or aluminum alloy.
A metal powder made of a magnetic material such as iron of a mesh is sprayed in an inert atmosphere to form a heat generating layer of 300 μm to 600 μm, and a rust preventive layer made of a heat resistant resin is further provided on the surface of the heat generating layer.

[0006]

According to the above construction, it is possible to provide a stable heat generating layer by thermal spraying on the outer bottom surface and the lower side surface of the heating container used in the electromagnetic cooker. That is, the thermal spraying is performed, for example, by arc spraying or high-speed fuel spraying in an inert atmosphere.
Using 25 mesh and large particles, the particles are blown onto the surface of the heating container at a high speed, and a metal heating layer of 300 μm to 600 μm that is not oxidized is formed on the surface. In addition, a heat-resistant resin rust preventive layer is provided on the surface of the heat generating layer to improve the water repellent property and prevent the entry of water.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

A heating container 1 is made of aluminum or an aluminum alloy. This heating container 1 is provided with a heat generating layer 2 by spraying a metal powder made of a magnetic material such as SUS430 of iron, 13Cr and 18Cr from the outer bottom surface to the rising portion (about 50 mm in height) on the outer periphery of the lower side surface. In order to obtain the output required for electromagnetic induction heating, the heat generating layer 2 needs to be continuously connected to the metal powder without containing an oxide film. Therefore, the heating layer 2 has a mesh size of 200 mesh to 32.
Heating container 1 using 5 mesh metal powder of uniform particle size
To a uniform thickness of 300 μm to 600 μm. In this case, if the particle size distribution of the metal powder is not uniform and a large amount of fine powder of 325 mesh or less is contained, the metal particles are likely to be blocked by the oxide film, so that the metal particles are removed. If it is larger than 200 mesh, it may not be melted at the time of thermal spraying. The sensor mounting portion 3 in which the heating layer 2 is not provided in the central portion of the bottom surface of the heating container 1 for accurately detecting the temperature
Is provided. Reference numeral 4 denotes a rust preventive layer, which is formed by applying a polysulfone-based or polysiloxane-based heat-resistant resin on the surface of the heat generating layer 2 so that the heating container 1 and the heat generating layer 2 are not corroded. This rust preventive layer 4 has heat resistance up to 300 ° C., and since it is not porous, it has water repellency and has a function of preventing the intrusion of water. In addition, a release layer (not shown) such as a fluororesin is applied to the inner surface of the heating container 1 to facilitate easy cleaning of the food. Reference numeral 5 denotes an electromagnetic induction heating coil, which is provided on a coil support plate 6 having a ferrite (not shown) attached to its back surface, and has an outer diameter larger than the outer bottom surface outer diameter of the heating container 1 by H (about 10 mm). The side surface of the heating container 1 is also heated.

In this embodiment, when the electromagnetic induction heating coil 5 is energized, an eddy current is generated between the electromagnetic induction heating coil 5 and the heat generating layer 2, and the heating container 1 is heated by Joule heat to cook the food inside. To do. The end of cooking is detected by a sensor (not shown) mounted on the sensor mounting portion 3.

[0010]

According to the present invention, the outer bottom surface and the outer circumference of the lower side surface of a heating container made of aluminum or an aluminum alloy are sprayed in an inert atmosphere at 200 mesh to 3 mesh.
Since a metal powder made of a magnetic material such as iron powder of 25 mesh is sprayed to provide a heat generating layer of 300 μm to 600 μm, the heating container can obtain a predetermined output and can improve the durability of the surface of the heat generating layer. . In addition, since the heat-resistant resin layer is provided on the surface of the heat-generating layer, moisture does not enter the heat-generating layer and rusting can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an electromagnetic cooker according to the present invention.

[Explanation of symbols]

 1 Heating Container 2 Heating Layer 3 Sensor Attachment Part 4 Sensor 5 Electromagnetic Induction Heating Coil 6 Coil Support Plate

Claims (1)

[Claims] 1. A heating container (1) made of aluminum or an aluminum alloy is installed above the electromagnetic induction heating coil (5), and the heating container (1) is heated by Joule heat by eddy current. In an electromagnetic cooker, a metal powder made of a magnetic material such as iron having a particle size distribution of 200 mesh to 325 mesh is thermally sprayed in an inert atmosphere on the outer bottom surface and the outer periphery of the lower side surface of the heating container (1) to 300 μm to 600 μm. The heating container for an electromagnetic cooker, wherein the heating layer (2) is formed, and a rust preventive layer (4) made of a heat-resistant resin is further provided on the surface of the heating layer (2).