JPH031914Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a cooking container used in an electromagnetic cooker.

Conventional configurations and their problems Pots that can be heated with conventional induction cookers are limited to metal enamelled pots, cast iron, stainless steel pots, etc., and pots made of non-metallic materials such as clay pots, tempered glass pots, and ceramic plates. It was inconvenient because the pot could not be heated.

To improve this problem, it has been proposed to provide an earthenware pot with a non-magnetic metal thin film 5 as shown in FIG. Those made of thin film are
This device does not operate and cannot heat up. In order to solve this problem, there is also a plan to heat the container 4 by causing an iron plate 5 or the like to generate heat as shown in FIG. However, in both cases, if the container is left empty, it is difficult to protect it and the container may break due to the difference in thermal expansion between the container and the heating element. In general, the pot temperature overheat prevention device built into induction cookers does not directly detect the temperature of the pot, and the accuracy of temperature detection with this device may deteriorate, especially for pots that tend to warp on the bottom of the pot, such as clay pots. I can't do it. because,
The built-in pot temperature overrise prevention device detects the temperature at the bottom of the pot using the temperature sensor on the back of the pot mounting plate, so many heat resistors are used to detect the temperature. are doing.

In particular, the degree of contact between the bottom of the pot and the pot mounting plate is a major factor, but it is hardly possible to expect uniformity of the contact surface with earthenware pots and the like.

Purpose of the invention This invention not only provides a heating cooking container such as an earthenware pot made of non-metallic materials, which could not be used until now, but also prevents the risk of cracking if the temperature reaches abnormal temperatures due to empty heating. Therefore, it is an object of the present invention to provide a safe cooking container equipped with a magnetic material that loses its magnetism depending on the temperature.

Structure of the Invention In order to achieve the above object, the present invention provides a member heated by magnetic lines of force, such as a thin film of non-magnetic metal, on the bottom of a container body formed of a non-metallic material such as an earthenware pot, and A magnetic material having a Kyuri point such as ferrite is provided in the center of the bottom.

Description of the embodiment In Fig. 1, a heating coil 2 is mounted on a coil base 1.
is fixed, and a pot mounting plate 3 is configured above it. When a cooking container 4 made of a non-metallic material such as an earthenware pot is placed on the pot mounting plate 3, the permanent magnet 7 is attracted by the magnetic material 6, which is made of ferrite and has a Kyuri point, so that it moves upward as shown in the figure. , the micro switch 8 is turned on, and a high frequency current flows through the heating coil 2. Further, the magnetic body 6 is provided at the center of the container 4, and the permanent magnet 7 constituting the pot detection device
Of the microswitches 8 and 8, the permanent magnet 7 is provided at the center of the heating coil 2. That is, the heating operation is performed only when the center of the container 4 and the center of the heating coil coincide.

Magnetic lines of force are generated from the heating coil 2, eddy currents are induced by the lines of magnetic force, and the heating element 5 disposed throughout the bottom plate of the container 4 generates heat to heat the food in the cooking container 4.

The heating element 5 is a printed thin film or sheet of non-magnetic metal. Even if a non-magnetic material is made into a thin film through which high-frequency current penetrates deep, it has an effective resistance sufficient to heat the material and can generate heat.
This can be understood from the fact that aluminum oil generates heat.

If the moisture in the cooking container 4 runs out and you accidentally continue heating, the cooking container 4 will become empty and reach an abnormally high temperature. Naturally, the cooked food will be wasted since it may break. In order to prevent this, the magnetic body 6 has a characteristic that when the temperature reaches an abnormal temperature, the magnetic body 6 reaches the Kyuri point and loses its magnetism.

When the magnetic body 6 reaches the Kyuri point, the permanent magnet 7
cannot be fully absorbed and falls downward due to its own weight, and presses the button on micro switch 8 to turn it off.
The supply of high frequency current to the heating coil is stopped and the container is no longer heated.

The permanent magnet 7 and the micro switch 8 detect the magnetic material and have the power-saving effect of heating only when a pot is present, and are generally known as a pot detection device.

Utilizing the characteristics of this pot detection device and interacting with the cooking container configured according to the present invention, it is possible to operate the pot detection device and heat it even with a heating element made of a non-magnetic thin film, as described above. At the same time, it is possible to detect empty firing. As already explained, it is naturally possible to operate as a power saving function in which heating is automatically stopped when the container is removed, as in the conventional function.

FIG. 2 shows another embodiment in which it is used for hot plates, ceramic plates, etc.

The structure and operation are the same as in FIG. 1 and will not be described here, but since this type of container is used for cooking grilled foods, the Curie temperature of the magnetic body 6 is set to a higher temperature than in the embodiment shown in FIG.

FIG. 3 shows another embodiment in which the temperature distribution is improved. Particularly, as shown in Figure 2, uniformity of temperature distribution is required for ceramic firing.

Generally, the distribution of magnetic lines of force from the heating coil 2 is weaker on the outer circumferential side. Since this directly deteriorates the temperature distribution, more heating elements 5 are provided on the outer periphery rather than on one side, and the area of the heating element is reduced in the middle part where the lines of magnetic force are concentrated. In this way, the heating element 5 is divided so as to correct the distribution of magnetic lines of force, and the overall temperature can be made flat.

In FIG. 3, it is divided into four parts on the circumferential side in a donut shape, but this division can be made arbitrarily.

Furthermore, in addition to flattening the temperature distribution, it is also possible to arrange them arbitrarily to suit the purpose of cooking.

4 and 5, the heating element 5 is located in the cooking container 4.
Another example will be shown in which the cross-sections are different.
FIG. 4 shows a heating element 5 disposed on the bottom of a container, and the manufacturing process of the heating element is easy even if the container is a deep pot, a shallow pot, or an irregularly shaped pot.

In FIG. 5, a heating element 5 is disposed on the top surface of the container, which is close to the contents to be cooked, and has the advantage that the temperature rises quickly.

Effects of the invention (1) A container made of non-metal can be used in an electromagnetic cooker.

(2) Empty heating can be detected and there is no risk of the container breaking.

(3) Since there is a sensor inside the container that detects the temperature, highly accurate protection is possible even if there is a warp on the bottom of the container.

(4) Since the heating operation is performed when the center of the container and the center of the heating coil match, efficient heating is guaranteed.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an electromagnetic cooker showing one embodiment of the present invention, Fig. 2 is a sectional view of a cooking container showing another embodiment, and Fig. 3 is a sectional view of an embodiment with improved temperature distribution. FIGS. 4 and 5 are sectional views of other embodiments of the arrangement position of the heating element, and FIGS. 6 and 7 are sectional views of conventional examples. 1... Coil base, 2... Heating coil, 3...
...Pot mounting plate, 4...Cooking container, 6...Magnetic material.

Claims (1)

[Scope of utility model registration request] A member heated by lines of magnetic force, such as a thin film of non-magnetic metal, is provided at the bottom of a container body made of a non-metallic material such as an earthenware pot, and a magnetic material with a Currie point such as ferrite is placed in the center of the bottom of the container. A cooking container for an electromagnetic cooker with a body.