JP4654167B2 - Container to be heated - Google Patents

Description

  The present invention relates to a heated container, and more particularly to a heated container used for an induction heating apparatus.

  Recently, an induction heating apparatus has been developed that can perform induction heating even in an aluminum heated container that is a nonmagnetic heated container. However, when heating a heated container made of aluminum, which is a nonmagnetic metal, a larger magnetomotive force is applied compared to a magnetic pan, so heated containers made of aluminum that are lightweight due to the repulsive force of the magnetic force are not covered. There is a drawback that the heating container is liable to float and shift. On the other hand, the heated container made of aluminum is a lightweight heated container that is less burdensome for the cook, and it is considered that the demand will continue to be great in the future.

  In Patent Document 1, as a heated container made of aluminum having a large load structure and a center of gravity at the center, the floating of the heated container is prevented from being reduced.

JP 2006-102084 A

  It is an object of the present invention to prevent the heated container that may be generated when the heated container made of aluminum, which is a light and low magnetic metal, is heated by an induction heating device.

  A heated container constituted by a low magnetic metal body, wherein a separation insulating part that insulates eddy current flowing through the heated container by an induction heating device is disposed from the bottom to the side of the heated container. The container can solve the above problem.

  Alternatively, in a heated container made of a low magnetic metal body, the container includes a separation insulating part that insulates eddy current flowing through the heated container, and the eddy current flows in opposite directions on both front and back surfaces of the bottom of the heated container. Thus, the said subject can be solved also by the to-be-heated container characterized by arrange | positioning the said isolation | separation insulation part.

  Alternatively, in a heated container composed of a low magnetic metal body, the induction heating apparatus includes a slit-shaped separation insulating part that insulates eddy current flowing in the heated container, and the separation insulating part is received by the heated container The above-mentioned problem can also be solved by a heated container characterized in that the eddy current flow path is configured to suppress buoyancy from the air.

  ADVANTAGE OF THE INVENTION According to this invention, when heating the to-be-heated container of a low magnetic material with an induction heating apparatus, it can implement | achieve prevention of the to-be-heated container comprised with a low magnetic metal.

FIG. 1 shows the principle configuration of a typical heated container. When a high-frequency current is applied to the heating coil 3 in an alternating direction and the coil current 31 flows in the direction shown in the figure, a magnetic force line 32 is induced from the core 4. This magnetic force line 32 generates an eddy current so that the back surface portion of the bottom back surface 101 of the heated container 10 is opposed to the magnetic force line 32. Heat is generated by the backside eddy current 33 and the power loss of the heated container 10. At the same time, the direction of the back surface eddy current 33 and the direction of the magnetic force lines 32 cause an upward force on the bottom back surface 101 of the heated container 10 according to the Fleming left-hand rule. Will occur.

  With the configuration shown in each example described later, the above-described heated container can be prevented from floating.

Example 1
Below, Example 1 of the to-be-heated container for induction heating apparatuses is described using figures. FIG. 2 shows the configuration of the induction heating apparatus and the heated container in the embodiment of the present invention. In FIG. 2, the heated container 1, its separation insulating part 9, the top plate 2 serving as a base plate of the heated container 1, the heating coil 3 for induction heating the heated container 1, and the magnetic force of the heating coil 3 are increased, A plurality of U-type, L-type, and I-type cores 4 for magnetic induction to the heated container 1, an AC power source 5 for driving the heating coil 3, a rectifier circuit 6, an inverter circuit 7 for converting DC to high-frequency power, resonance And a capacitor 8.

  In the heated container 1, a separation insulating part 9 is formed in a slit shape (a slit is a gap for separating a plate-like member) from the center to the side surface of the heated container bottom, and by providing this separation insulating part 9 The eddy current received from the heating coil 3 and the core 4 is caused to flow not only on the back surface of the bottom of the heated container 1 but also on the bottom surface, thereby preventing the lightweight heated container from rising. Details thereof will be described with reference to FIG.

FIG. 3 shows a principle configuration for preventing the heated container according to the present embodiment from rising. Assuming that a coil current 31, which is a high-frequency current, flows to the heating coil 3 in the illustrated direction, a magnetic force line 32 is induced from the core 4. The magnetic force lines 32 pass through the bottom rear surface 11 of the heated container 1 and generate a back surface eddy current 33 so as to oppose the magnetic force lines 32. The back surface eddy current 33 loops in the opposite direction of the back surface eddy current 33 on the bottom surface 12 of the heated container 1 by the separation insulating portion 9 and the surface eddy current 35 flows. Therefore, according to the Fleming left-hand rule, an upward force is generated on the heated container bottom surface 11 and a downward force is generated on the heated container bottom surface 12 from the direction of the back surface eddy current 33 and the surface eddy current 35 and the direction of the magnetic force lines 32. A force that reverses the direction of the force to the heated container is applied to the bottom rear surface and the bottom surface of the heated container 1, and the force to the heated container 1 is offset. This is not a reduction in the floating of the heated container, but the floating of the heated container is almost eliminated.

  Further, since the eddy current flows through the bottom back surface 11 and the bottom surface 12 of the heated container 1, the flow length of the eddy current is increased and the flow resistance of the heated container 1 is increased. Therefore, the electric power to the heated container 1 that becomes heat increases because it is proportional to the product of the square of the eddy current and the resistance of the heated container 1. As a result, the increase in the resistance of the heated container 1 can reduce the coil current 31 of the heating coil 3, leading to a reduction in the copper loss of the heating coil 3 and the loss in the circuit section such as the inverter circuit 7, thereby improving the heating efficiency. Will contribute.

FIG. 4 shows a cross-sectional configuration of the heated container bottom. By providing the separation insulating portion 9 in the heated container 1, the loop of the back surface eddy current 33 on the bottom surface 11 of the heated container flows in the thickness direction through the separation insulating portion 9, and loops in the reverse direction on the heated container bottom surface 12. A surface eddy current 35 flows. In order to allow this eddy current to flow on both the bottom surface 11 of the heated container bottom and the bottom surface 12 of the heated container, the bottom of the heated container needs to have a thickness exceeding about twice the skin depth. For example, when the driving frequency is 90 kHz, the skin depth of aluminum is 0.266 mm, and the thickness is about 0.53 mm or more.

  The insulator of the separation insulating portion 9 is embedded and bonded to the slit to be separated of the heated container 1, and the material may be ceramic. Further, as shown in FIG. 5, the separation insulating portion 91 may have a structure in which an insulator is covered with the heated container 1. Furthermore, the entire surface of the heated container bottom may be coated.

  FIG. 6 shows an application example of the heated container according to this embodiment. A heat insulating material 40 is disposed on the back surface of the bottom of the heated container 1 that constitutes the separation insulating part 9, and the heat conduction from the heated container 1 is shielded against the upper surface of the top plate 2, and the conduction of the upper surface of the top plate 2 is performed. Prevents temperature rise due to heat. With this configuration, it is possible to improve safety and further improve thermal efficiency by suppressing the temperature rise of the top plate 2.

(Example 2)
FIG. 7 is a configuration diagram of a heated container in the second embodiment. Here, a structure having a spiral separation insulating portion 92 at the bottom of the container to be heated is employed. Due to this spiral structure, eddy currents flow in opposite directions on the back and front surfaces of the bottom, as well as increasing the resistance of the heated container 20 by increasing the flow path length of the eddy current. Thereby, the coil current to the heating coil 3 can be further reduced, and the heating efficiency can be improved by reducing losses such as copper loss.

  Also, a structure having a spiral separation insulating portion 92 on the bottom surface of the heated container as shown in FIG. 8 and a separation insulating portion 9 on the side surface of the heated container, or a heated container as shown in FIG. If the spiral separation insulating portion formed at the bottom of the structure is extended to the side surface, the heating efficiency is further improved.

  Also in the present embodiment, the insulator of the separation insulating portion 9 is embedded and bonded and bonded to the slit to be separated of the heated container 1, and the material may be ceramic. Further, as shown in FIG. 5, the separation insulating portion 91 may have a structure in which an insulator is covered with the heated container 1. Furthermore, the entire surface of the heated container bottom may be coated.

  Further, in the application example of the heated container which is the present embodiment shown in FIG. 8, the heat insulating material 40 is disposed on the back surface of the bottom of the heated container 1 constituting the separation insulating part 9, and conduction from the heated container 1 is performed. Heat is shielded from heat on the top surface of the top plate 2 to prevent temperature rise due to conduction heat on the top surface of the top plate 2. This configuration also has the same effect as the configuration of Reference 1 as shown in FIG.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the to-be-heated container which can prevent a container's floating by using for an induction heating apparatus.

  In addition, according to the present invention, it is possible to provide a heated container that reduces the heating coil current and improves the heating efficiency by increasing the resistance of the eddy current flowing through the container by using the induction heating apparatus. Become.

The principle block diagram of the floating of a general heated container. The block diagram of the induction heating apparatus and to-be-heated container in embodiment of this invention. The principle block diagram of the floating prevention of the to-be-heated container in Example 1 of this invention. The 1st cross-section block diagram of the to-be-heated container bottom part in embodiment of this invention. The 2nd cross-section block diagram of the to-be-heated container bottom part in embodiment of this invention. The block diagram of the application example of the to-be-heated container in Example 1 of this invention. The 1st block diagram of the to-be-heated container in Example 2 of this invention. The 2nd block diagram of the to-be-heated container in Example 2 of this invention. The 3rd block diagram of the to-be-heated container in Example 2 of this invention. The block diagram of the application example of the to-be-heated container in Example 2 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,10,20 ... Heated container, 2 ... Top plate, 3 ... Heating coil, 4 ... Core, 5 ... AC power supply, 6 ... Rectifier circuit, 7 ... Inverter circuit, 8 ... Resonance capacitor, 9, 91, 92 ... Separation insulating part 11, 101 ... Heated container bottom back surface, 12, 102 ... Heated container bottom surface, 31 ... Coil current, 32 ... Magnetic field line, 33 ... Back surface eddy current, 35 ... Surface eddy current, 40 ... Heat insulation material.

Claims (20)

In a heated container composed of a low magnetic metal body,
A separation insulating portion that insulates eddy current flowing in the heated container by a magnetic field generated from an induction heating device is disposed from the center of the bottom of the heated container to the side surface of the heated container. container. In claim 1,
The said isolation | separation insulation part is comprised by the said to-be-heated container in slit shape, The to-be-heated container characterized by the above-mentioned. In claim 2,
The container to be heated is characterized in that the separation insulating portion is embedded in or covered in the slit of the low magnetic metal body or covers the entire surface of the bottom of the container to be heated. In claim 1,
A container to be heated, wherein a part or all of the separation insulating part is arranged in a spiral shape. In claim 1,
The container to be heated is characterized in that the separation insulating part is disposed only at the bottom of the container to be heated. In claim 1,
The heated container, wherein the separation insulating part is disposed so as to lengthen the flow path of the eddy current. In claim 1,
The container to be heated is characterized in that the separation insulating part is arranged so that the eddy current flows through both the front and back surfaces of the bottom of the container to be heated in opposite directions. In claim 7,
The heated container is characterized in that the thickness of the bottom of the heated container is at least twice the metal skin depth of the low magnetic metal body. In claim 1,
A heated container comprising a heat insulating material on the bottom rear surface of the heated container. In a heated container composed of a low magnetic metal body,
Comprising a slit-like isolation insulating part that insulates eddy current flowing in the heated container by a magnetic field generated from an induction heating device;
The container to be heated is arranged so that the eddy current flows in opposite directions on both the front and back surfaces of the bottom of the container to be heated. In claim 10,
The container to be heated is characterized in that the separation insulating part is arranged from the center of the bottom of the container to be heated to the side surface of the container to be heated. In claim 10,
A container to be heated, wherein a part or all of the separation insulating part is arranged in a spiral shape. In claim 10,
The container to be heated is characterized in that the separation insulating part is disposed only at the bottom of the container to be heated. In claim 10,
The container to be heated is characterized in that the separation insulating portion is embedded in or covered in the slit of the low magnetic metal body or covers the entire surface of the bottom of the container to be heated. In claim 10,
The heated container is characterized in that the thickness of the bottom of the heated container is at least twice the metal skin depth of the low magnetic metal body. In claim 10,
A heated container comprising a heat insulating material on the bottom rear surface of the heated container. In a heated container composed of a low magnetic metal body,
Comprising a slit-like isolation insulating part that insulates eddy currents flowing through the heated container by a magnetic field generated from an induction heating device;
The separation insulating portion constitutes a flow path of the eddy current that suppresses buoyancy from the induction heating device received by the heated container. In claim 17,
The container to be heated is characterized in that the separation insulating part is arranged from the center of the bottom of the container to be heated to the side surface of the container to be heated. In claim 17,
The container to be heated is arranged so that the eddy current flows in opposite directions on both the front and back surfaces of the bottom of the container to be heated. In claim 17,
A container to be heated, wherein a part or all of the separation insulating part is arranged in a spiral shape.

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