JP5450191B2 - IH cooker - Google Patents

Description

  The present invention relates to an IH cooker.

  In recent years, IH cookers that heat containers by an electromagnetic induction heating (IH) method have been widely used. When a nonmagnetic material such as an aluminum alloy or a copper alloy is used as a material for a heated container used in such an IH cooker, an eddy current is hardly generated even if the magnetic field is changed. A magnetic material such as iron is joined by brazing or hot pressing, or a coating is formed by spraying iron powder or the like. Patent Document 1 proposes a nonmagnetic material pan in which a divided plate having a shape obtained by dividing a circular magnetic material into eight equal parts is joined to the bottom surface. This pan is heated by an IH cooker in which induction coils are arranged in a spiral. By doing so, it is described that small divided plates can be cut out from each other without punching out a large plate from a large-sized magnetic material, so that the material can be used without waste.

JP 2001-203070 A

  However, in Patent Document 1, since the induction coil of the IH cooker is a coil wound in one direction as is generally known, an eddy current is generated in each of the divided plates. There was a problem that the pan bottom could not be heated uniformly.

  The present invention has been made in view of the above-described problems, and a main object of the present invention is to uniformly heat a container made of a non-magnetic material to which magnetic material dividing plates are joined.

  The present invention adopts the following means in order to achieve the main object described above.

  That is, in the IH cooker of the present invention, a plurality of divided plates made of a magnetic material having first and second regions that are substantially parallel to and spaced from each other in a predetermined direction are arranged in a row along the predetermined direction. An IH cooker for heating a heated container, comprising: a coil; and a power supply unit capable of supplying AC power to both terminals of the coil, the coil being arranged in one row of the heated container The direction of the current flowing along the first imaginary line when the first regions are virtually connected and the second imaginary line when the second regions are virtually connected for the plurality of divided plates forming The wire is wound so that the direction of the current flowing along the line is opposite.

  In this IH cooker, in the vicinity of the center of each divided plate of the heated container, the direction of the magnetic field generated by the current flowing through the position facing the first region and the direction of the magnetic field generated by the current flowing through the position facing the second region And become the same. Therefore, an eddy current is generated in each of the divided plates of the heated container so that a magnetic field in a direction opposite to the direction is generated, and Joule heat is generated. As a result, portions of the heated container to which the plurality of divided plates are attached are dispersed and heated. Therefore, according to the IH cooker of this invention, the container made from a nonmagnetic material which joined the division | segmentation plate made from a magnetic material can be heated uniformly.

  The IH cooker of the present invention is applied to a bottomed cylindrical container as the heated container, and a plurality of the IH cookers are arranged along the circumferential direction on the cylindrical side surface and / or the circular bottom surface of the container. The divided plates arranged side by side may be heated. Examples of such heated containers include three-dimensional containers such as pots and kettles. In particular, a kettle for cooking simmered rice is easy to burn, so it is desirable to uniformly heat the entire bottom surface of the kettle, so that the present invention is highly meaningful.

  The IH cooker of the present invention is applied to a container including a flat portion as the heated container, and heats the divided plates arranged in a row along the linear direction in the flat portion. It may be a thing. Examples of such a container to be heated include a container that cooks on a flat surface such as a frying pan or an egg-cooker.

  In the IH cooker of the present invention, the coil is preferably covered with a heat insulating material. If it carries out like this, it will become easy to maintain the temperature of the heated container to be heated by the effect of a heat insulating material.

1 is a cross-sectional view of a copper pot 10. FIG. 3 is a bottom view of the copper pot 10. It is sectional drawing showing a mode when the copper pot 10 is heated with the IH cooker 30. FIG. It is a perspective view of the coil of the IH cooker 30. FIG. It is a bottom view of the copper pot 10 showing a state in which eddy current is generated in each divided plate 14 and 16. It is sectional drawing showing a mode when the pot main body 12 is heated with the IH cooker 130. FIG. It is a perspective view showing the egg-cooking device 60 and the IH cooking device 80. It is sectional drawing showing a mode when the egg-baking device 60 is heated with the IH cooking device 80. FIG.

  A preferred embodiment of the present invention will be described below with reference to the drawings. 1 is a cross-sectional view of the copper pot 10, FIG. 2 is a bottom view of the copper pot 10, FIG. 3 is a cross-sectional view showing a state when the copper pot 10 is heated by the IH cooker 30, and FIG. It is a perspective view of a coil.

  The copper pot 10 includes a hook body 12 having an opening in the upper portion and a lid 18 that closes the opening of the hook body 12. The shuttle main body 12 is formed in a bottomed cylindrical shape, and has a shape in which the bottom surface is slightly swollen downward. The split plates 14 and 16 made of magnetic material (for example, iron) are sprayed from the cylindrical side surface near the bottom surface of the hook body 12 to the circular bottom surface. The dividing plate 14 has a substantially rectangular shape, and is provided in a line of eight sheets with a predetermined interval (for example, several mm to several cm) so as to form an upper row along the horizontal circumferential direction. Of the divided plate 14, two virtual regions that are substantially parallel to and spaced apart from each other in the horizontal circumferential direction are referred to as a first region 14a and a second region 14b. Moreover, the division | segmentation plate 16 is substantially fan shape, and is provided in 8 sheets at predetermined intervals so that the lower row | line | column may be made along a horizontal circumferential direction. Two regions of the divided plate 16 that are substantially parallel and spaced apart from each other along the horizontal circumferential direction are referred to as a first region 16a and a second region 16b.

  Although not shown, the hook body 12 is provided with a thermocouple for measuring the temperature of the internal space. The lid 18 is fixed so as not to be removed by a clamp (not shown) with the opening of the hook body 12 closed. Although not shown, the lid 18 has a vacuum pump for making the internal space of the copper pot 10 in a vacuum state, a vacuum gauge for measuring the degree of vacuum of the internal space, and a deaeration capable of communicating and blocking the internal space and the outside. Valves are provided.

  The IH cooker 30 is formed in a concave curved surface shape that can receive the pot body 12 of the copper pot 10, and a case 32 made of a non-magnetic material (for example, aluminum or non-magnetic stainless steel) and an inner upper stage of the case 32. The upper coil 34 disposed, the lower coil 36 disposed on the lower inner side of the case 32, the heat insulating layer 38 provided so as to cover both the coils 34, 36, and the alternating current that supplies power to both the coils 34, 36 And a power supply 40. The heat insulating layer 38 is not particularly limited as long as it can withstand the heating temperature, and examples thereof include rock wool and glass wool. Since the upper coil 34 and the lower coil 36 are the same except for the arrangement position, the winding diameter, and the distance between the wires, the upper coil 34 will be described below.

  As shown in FIG. 4, the upper coil 34 is wound slightly upward after winding the wire from one end 34 a, wound once more counterclockwise, then largely downward, and then wound clockwise. The other end 34d is shifted slightly upward and then wound clockwise again so that the other end 34d is directly below the one end 34a. Of the upper coil 34, the upper half 34 b faces the first region 14 a of the divided plate 14, and the lower half 34 c faces the second region 14 b of the divided plate 14. An AC power supply 40 is connected between one end 34 a and the other end 34 d of the upper coil 34. Since the upper coil 34 is wound in this way, for example, when current flows from one end 34a to the other end 34d of the upper coil 34, the current flows counterclockwise in the upper half 34b, but the lower half 34c is Current flows around. That is, in the upper coil 34, the direction of the current flowing along the first virtual line when the first region 14a of the divided plate 14 is virtually connected along the upper row and the second region 14b are virtually connected. The electric wire is wound so that the direction of the current flowing along the second imaginary line is opposite. On the other hand, for the lower coil 36, as with the upper coil 34, the direction of the current flowing along the first imaginary line when the first region 16 a of the divided plate 16 is virtually connected along the upper row, The electric wire is wound so that the direction of the current flowing along the second imaginary line when the regions 16b are virtually connected is opposite.

  Next, the operation of the IH cooker 30 of this embodiment will be described with reference to FIG. Here, the operation of the upper coil 34 will be described. For example, when a current flows from one end 34 a to the other end 34 d of the upper coil 34, a current flows counterclockwise in the upper half 34 b, so that a magnetic field inward in the radial direction is generated near the center of the divided plate 14. In addition, since a current flows clockwise in the lower half 34c, a radially inward magnetic field is also generated near the center of the divided plate 14. Then, an eddy current flows through the divided plate 14 so as to cancel the magnetic field generated in this way (see the thick dotted arrow in FIG. 4). On the other hand, when a current flows from one end to the other end of the lower coil 36, a magnetic field in the same direction is generated by the upper half and the lower half of the lower coil 36 near the center of the divided plate 16. An eddy current flows in the same manner as the divided plate 14. The state at this time is shown in FIG. When a current flows from the other end 34d of the upper coil 34 toward the one end 34a and a current flows from the other end of the lower coil 36 toward the one end, an eddy current in the direction opposite to that in FIG. 5 flows.

  According to the IH cooker 30 of the present embodiment described in detail above, the copper pot 10 to which the divided plates 14 and 16 made of magnetic material are joined can be heated uniformly. In particular, when the copper pot 10 is used for cooking in a bowl, it is desirable to uniformly heat the entire bottom surface of the pot because the bowl is easily burnt. Therefore, the significance of applying the IH cooker 30 is high. Further, since the bottom surface of the hook body 12 is covered with the heat insulating layer 38, the temperature of the hook body 12 can be easily maintained.

  It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that the present invention can be implemented in various modes as long as it belongs to the technical scope of the present invention.

  For example, in the above-described embodiment, the divided plate 14 that forms the upper row and the divided plate 16 that forms the lower row are configured such that the other row does not enter one row, but as shown in FIG. A configuration may be adopted in which the lower end of the dividing plate 114 forming the upper row enters the lower row and the upper end of the dividing plate 116 forming the lower row enters the upper row. In this case, the upper coil 134 surrounding the divided plate 114 forming the upper row is wound in the same manner as the upper coil 34, and the upper half (two turns) faces the first region 114a and the lower half (2 The winding portion) is opposed to the second region 114b. The direction of the current flowing along the first imaginary line when the first region 114a of the divided plate 114 is virtually connected along the upper row and the second direction when the second region 114b is virtually connected. The electric wire is wound so that the direction of the current flowing along the virtual line is opposite. On the other hand, the lower coil 136 surrounding the divided plate 116 forming the lower row is wound in the same manner as the upper coil 134, and the upper half (two turns) faces the first region 116a and the lower half (two turns). Min) is opposed to the second region 116b. The direction of the current flowing along the first imaginary line when the first region 116a of the divided plate 116 is virtually connected along the lower row and the second direction when the second region 116b is virtually connected. The electric wire is wound so that the direction of the current flowing along the virtual line is opposite. In FIG. 6, since the second region 114b of the dividing plate 114 and the first region 116a of the dividing plate 116 overlap in the vertical direction, the current direction of the lower half of the upper coil 134 surrounding the second region 114b Wiring is performed so that the direction of the current of the upper half of the lower coil 136 surrounding the first region 116a is the same. For this reason, the magnetic field which penetrates each division | segmentation plates 114 and 116 generate | occur | produces efficiently, and the eddy current which cancels it efficiently generate | occur | produces.

  In the above-described embodiment, the IH cooker 30 that heats the copper pot 10 having the cylindrical portion has been described as an example. However, as shown in FIGS. 7 and 8, the IH that heats the egg roaster 60 having the flat portion. The cooking device 80 may be used. The egg roaster 60 includes a copper rectangular flat part 62, an outer wall part 64 that surrounds the outer periphery of the flat part 62, and a partition part 66 that bisects the space surrounded by the outer wall part 64. Further, four rectangular divided iron plates 68 are arranged on the back surface of the flat portion 62 so as to form a line along the longitudinal direction (linear direction). Each divided plate 68 has two virtual regions, which are substantially parallel to the longitudinal direction and spaced apart from each other, first and second regions 68a and 68b. On the other hand, the IH cooker 80 includes a coil 82 disposed on the back side of the egg-cooker 60 and an AC power supply 84 that can supply power between one end 82 a and the other end 82 d of the coil 82. The coil 82 is obtained by winding an electric wire twice in an oval shape. When the egg-cooker 60 is heated by the IH cooker 80, the back surface of the egg-cooker 60 is placed close to the upper surface of the coil 82 as shown in FIG. The portion of the coil 82 where the electric wire is U-turned is protruded from the back surface of the egg-baking device 60. At this time, the direction of the current flowing along the first imaginary line when the coil 82 virtually connects the first regions 68a of the divided plates 68 (direction of the current flowing through the electric wire in the left half 82b of the coil 82). The direction of the current flowing along the second imaginary line when the second region 68b is virtually connected (the direction of the current flowing through the electric wire in the right half 82c of the coil 82) is opposite. Then, in the vicinity of the center of each divided plate 68, the direction of the magnetic field generated by the current flowing through the left half 82b of the coil 82 is the same as the direction of the magnetic field generated by the current flowing through the right half 82c. For this reason, an eddy current is generated in each of the divided plates 68 of the egg roaster 60 so that a magnetic field in a direction to cancel the magnetic field is generated, and Joule heat is generated. Therefore, according to the IH cooker 80, the flat surface portion 62 of the egg roaster 60 can be heated uniformly. Note that a heat insulating layer may be provided between the coil 82 and the flat portion 62 of the egg roaster 60.

  In the above-described embodiment, the upper half of the upper coil 34 is wound twice and the lower half is wound twice, but the number of turns may be two or more. Further, the number of windings in the upper half and the lower half may be the same or different. The same applies to the lower coil 36.

  In the embodiment described above, a plurality of rows of divided plates are provided in the upper and lower rows, but only one row (for example, only the upper row, only the lower row) may be provided, or three or more rows may be provided. Good.

10 copper pot, 12 pot body, 14 divided plate, 14a first area, 14b second area, 16 divided plate, 16a first area, 16b second area, 18 lid, 30 IH cooker, 32 case, 34 upper coil , 34a one end, 34b upper half, 34c lower half, 34d other end, 36 lower coil, 38 heat insulation layer, 40 AC power source, 60 fried egg oven, 62 plane portion, 64 outer wall portion, 66 partition portion, 68 split plate, 68a first plate 1 area, 68b 2nd area, 80 IH cooker, 82 coil, 82a one end, 82b left half, 82c right half, 82d other end, 84 AC power supply, 114 divided plate, 114a 1st area, 114b 2nd area, 116 Dividing plate, 116a first region, 116b second region, 130 IH cooker, 134 upper coil, 1 36 Lower coil

Claims (4)

An IH cooker for heating a heated container in which a plurality of divided plates made of a magnetic material having first and second regions which are substantially parallel to and spaced from each other in a predetermined direction are arranged in a row along the predetermined direction Because
Coils,
A power supply unit capable of supplying AC power to both terminals of the coil;
With
The coil includes a plurality of divided plates that form one row of the heated containers, a direction of a current flowing along a first imaginary line when the first regions are virtually connected, and a second direction. The wire is wound so that the direction of the current flowing along the second imaginary line when the regions are virtually connected is opposite,
IH cooker. The container is applied to a bottomed cylindrical container as the container to be heated, and heats the divided plates arranged in a row along the circumferential direction on the cylindrical side surface and / or the circular bottom surface of the container. ,
The IH cooker according to claim 1. It is applied to a container including a flat part as the heated container, and heats the divided plates arranged in a row along the linear direction in the flat part.
The IH cooker according to claim 1. The coil is covered with a heat insulating material,
The IH cooker of any one of Claims 1-3.

Images