JP5117992B2 - Heating coil unit of electromagnetic induction heating cooker - Google Patents

Description

  The present invention relates to a heating coil unit of an electromagnetic induction heating cooker.

  Generally, in an electromagnetic induction heating cooker, since the bottom surfaces of pots, pans, frying pans, and the like that are to be heated are substantially circular, a generally circular heating coil unit usually follows the shape of the heated surface. Widely used (for example, see Patent Document 1 below). That is, this heating coil unit has an insulating disk-shaped holding base made of a heat-resistant resin molded product, and a circular protrusion protruding to the surface side is formed at the center of the holding base. A heating coil made of litz wire is wound around the protrusion around the protrusion so as to circulate in a spiral shape. Moreover, the ferrite core is radially attached to the back surface side of the holding table along the rib.

  By the way, among the types of electromagnetic induction heating cookers, the surface to be heated is not necessarily a circular one. For example, when cooking okonomiyaki, takoyaki, teppanyaki, boiled noodles, etc. It may be necessary to heat the surface uniformly. However, in the case of using a substantially circular heating coil unit in which a heating coil is wound so as to circulate in a spiral shape as described in Patent Document 1, as an electromagnetic induction heating cooker, a rectangular covering is used. It is difficult to uniformly heat the heating surface.

  Therefore, conventionally, in order to uniformly heat the rectangular surface to be heated, a technique has been proposed in which a heating coil that is wound in an elliptical shape is formed (for example, see Patent Document 2 below). That is, in this prior art, an elliptical winding mold is manufactured, and three rollers are provided along the heating coil supply direction, and each roller is wound while being bent by applying a bending force to the heating coil. By winding it around a mold, a heating coil that is circulated in an elliptical shape is formed.

Japanese Patent No. 3006184 JP 59-130637 A

  By the way, in the prior art described in Patent Document 2 described above, it is possible to mold an elliptical heating coil. However, when performing such molding, a dedicated winding die or a bending coil is used. There is a problem that it is necessary to provide a roller, and manufacturing costs are high.

  In other words, the electromagnetic induction heating cooker used as a cooking device for business use such as okonomiyaki, takoyaki, teppanyaki, boiled noodles, etc. has fewer shipments than ordinary household ones, and pots, pans, pans, etc. Compared with the case where the bottom surface to be heated is substantially circular, the size of the surface to be heated is different depending on the area, so that it becomes a small variety of products. For this reason, when a dedicated winding die or a bending roller is manufactured to meet individual requirements, there is a problem that enormous costs and man-hours are required.

  The present invention has been made to solve the above-described problems, and can easily and inexpensively form a non-circular heating coil, and can flexibly cope with a small variety of products. An object of the present invention is to provide a heating coil unit of an electromagnetic induction heating cooker capable of performing the above.

In order to achieve the above object, the present invention employs the following configuration.
That is, the heating coil unit of the electromagnetic induction heating cooker according to the invention of claim 1 includes a plurality of disk-shaped holding stands each having a protrusion formed at the center, and each holding stand is mounted on one fixed substrate, A heating coil is wound around the holding tables so as to circulate between the holding tables while being hooked on the protrusions of the holding tables.

  Moreover, the heating coil unit of the electromagnetic induction heating cooker according to the invention of claim 2 is the configuration of the invention of claim 1, wherein each holding base has a ferrite core so as to cross the circumferential direction of the heating coil. It is characterized by being arranged.

  According to the first aspect of the present invention, a plurality of existing disc-shaped holding stands for constituting a heating coil unit of a standard electromagnetic induction heating cooker are used as they are, and are circulated between the holding stands. By winding the heating coil in this manner, a non-circular heating coil unit can be configured. For this reason, there is no need to provide a dedicated winding die or a bending roller, so that the heating coil unit can be manufactured at a low cost, and the diameter of the holding table is different even when the size of the heated surface is different. Since it is only necessary to change the diameter of the heating coil, it is possible to flexibly deal with a small variety of products.

  According to the second aspect of the present invention, since the ferrite core is disposed so as to cross the rotating direction of the heating coil on each holding base, the inductance value of the heating coil can be set large, and the high frequency magnetic field can be set. It is possible to efficiently heat the surface to be heated by reducing the skin loss.

Embodiment 1 FIG.
FIG. 1 is a plan view of a heating coil unit of an electromagnetic induction heating cooker according to Embodiment 1 of the present invention, and FIG. 2 is a plan view of a holding table used to configure the heating coil unit.

  The heating coil unit of the electromagnetic induction heating cooker according to the first embodiment includes two holding bases 1 and each holding base 1 is attached to one fixed substrate 2 made of a metal plate or the like with a bolt or the like. It has been. As shown in FIG. 2, each holding stand 1 is an existing one that is manufactured to heat a substantially circular surface to be heated. That is, each holding stand 1 has a disk shape made of an insulating heat-resistant resin molded product such as a phenol resin, and a circular protrusion 11 protruding from the surface side is formed at the center, and the protrusion 11 is the center. Fan-shaped cutout holes 12 are formed at a predetermined pitch along the circumferential direction, and ribs 13 are provided radially between the front and rear cutout holes 12.

  And the heating coil 3 is wound so that it may circulate between each holding stand 1 in the state latched by the protrusion 11 of each holding stand 1. The heating coil 3 is made of a litz wire or the like that reduces the skin effect in the high frequency range. Although not shown, an adhesive fixing silicon resin is applied between the holding table 1 and the heating coil 3 in order to prevent the heating coil 3 from being displaced.

  Further, a flat rod-shaped ferrite core 4 is fixed to the rib 13 of each holding table 1 by adhesion or the like. In this case, each ferrite core 4 is disposed at a position crossing the rotating direction of the heating coil 3. As described above, if the ferrite core 4 is arranged on each holding base 1 so as to cross the rotating direction of the heating coil 3, the inductance value of the heating coil 3 can be increased, and the skin loss in the high frequency magnetic field is further reduced. This is convenient because the surface to be heated can be heated efficiently.

  In order to manufacture the heating coil unit having the above configuration, first, two holding bases 1 having a diameter in consideration of the size of the surface to be heated are prepared. And the ferrite core 4 is fixed to the location of the rib 13 of the back surface side of each holding stand 1 by adhesion or the like. Next, after each holding base 1 is fixed to the fixed substrate 2 with a bolt or the like (not shown), a silicon resin for bonding and fixing the heating coil 3 is applied to an appropriate portion on the surface side of each holding base 1. Then, one end of the heating coil 3 is inserted between the fixed substrate 2 and one holding table 1, pulled out from one notch hole 12 of the holding table 1 to the surface side, and hooked on the protrusion 11 of each holding table 1. The heating coil 3 is sequentially wound so as to circulate between the holding bases 1. After the heating coil 3 is wound, the surface of the heating coil 3 is coated and bonded and fixed so that the winding position of the heating coil 3 is not displaced. Further, the two end portions of the heating coil 3 are also fixed by a fixture (not shown).

  As described above, in the first embodiment, the two existing disk-shaped holding bases 1 for constituting a heating coil unit of a standard electromagnetic induction cooking device are used as they are, and are substantially rectangular. The circulating heating coil 3 can be molded very easily. Therefore, since there is no need to provide a dedicated winding die or bending roller as in the prior art, a substantially rectangular heating coil unit can be manufactured at a low cost, and the size of the surface to be heated is different in size. In this case, it is only necessary to use the holding bases 1 having different diameters, so that it is possible to flexibly cope with a small quantity and a wide variety.

  In FIG. 1, the distance between the holding bases 1 is short. However, when it is desired to increase the longitudinal dimension of the heated surface, the longitudinal dimension is as shown in FIG. This can be dealt with by using a large fixed substrate 2 to increase the distance between the two holding bases 1 and to increase the total length of the heating coil 3 to be wound. In this case, it is preferable to securely fix the intermediate portion with a silicon resin for adhesive fixing so that the heating coil 3 positioned between the left and right holding bases 1 is not displaced. Moreover, if the existing holding stand 1 with a small diameter is used, it is possible to reduce the dimension in the short direction of the heated surface. Further, here, the ferrite core 4 is fixed to the rib 13 as a flat bar, but instead, the ferrite core 4 may be formed in a sector shape and inserted into the notch hole 12.

Embodiment 2. FIG.
FIG. 4 is a plan view of a heating coil unit of the electromagnetic induction heating cooker according to the second embodiment.

  In the first embodiment, the heating coil 3 is tightly wound between the two holding bases 1, but in this second embodiment, each holding base 1 has two protrusions in addition to the central protrusion 11. A piece 14 is provided, and a predetermined gap Sp is formed between the heating coils 3 that are circulated by the protrusions 14.

  As described above, if the gap Sp is generated in the heating coil 3 that is circulated by providing the projecting piece 14 on each holding base 1, compared to the case where the heating coil 3 is densely wound between the two holding bases 1. And the advantage which can adjust the inductance value of the heating coil 3 arbitrarily according to the heating characteristic requested | required of an electromagnetic induction heating cooking appliance is acquired.

Embodiment 3 FIG.
FIG. 5 is a plan view of the heating coil unit of the electromagnetic induction heating cooker according to the third embodiment.

  In the first and second embodiments, the two holding tables 1 are used to form a substantially rectangular heating coil unit. In the third embodiment, four holding tables 1 are used to form a substantially square shape. A heating coil unit is configured. That is, the holding table 1 is fixed to each of the four corners of the square fixed substrate 2, and the heating coil 3 is wound around the holding table 1.

  As described above, when the four holding bases 1 are used, a substantially square heating coil unit can be configured. Therefore, the shape of the heating coil unit is not limited to the rectangular shape, and the application surface is expanded.

  In the case of the configuration shown in FIG. 5, the inner portion surrounded by the heating coil 3 may be non-uniformly heated. In order to cope with this, as shown in FIG. 6, the projections 21 are provided on the inner side of the mounting positions of the four holding bases 1 on the fixed substrate 2, and the heating coils are circulated around the outer sides of the projections 21. After winding 3, the heating coil 3 is subsequently wound around the outside of the protrusion 11 of the holding table 1. Thereby, since the part inside the processus | protrusion 11 of the holding stand 1 can also be heated simultaneously, the nonuniformity of a heating can be eliminated. Note that the heating coil wound along the protrusions 21 of the fixed substrate 2 and the heating coil wound along the protrusions 11 of each holding base 1 can be separated.

  The present invention is not limited to the configuration of the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the first and second embodiments, two holding bases 1 are used to form a rectangular heating coil unit, and in the third embodiment, four holding bases 1 are used to form a square heating coil unit. However, the present invention is not limited to this. For example, a substantially triangular heating coil unit is configured using three holding bases 1, six holding bases 1 are used, or eight holding bases 1 are used. It is also possible to configure a polygonal heating coil unit.

It is a top view of the heating coil unit of the electromagnetic induction heating cooking appliance in Embodiment 1 of this invention. It is a top view of the holding stand used in order to constitute the heating coil unit. It is a top view which shows the modification of the heating coil unit of the electromagnetic induction heating cooking appliance in Embodiment 1 of this invention. It is a top view of the heating coil unit of the electromagnetic induction heating cooking appliance in Embodiment 2 of this invention. It is a top view of the heating coil unit of the electromagnetic induction heating cooking appliance in Embodiment 3 of this invention. It is a top view which shows the modification of the heating coil unit of the electromagnetic induction heating cooking appliance in Embodiment 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Holding stand, 11 Protrusion, 12 Notch hole, 13 Rib, 14 Protruding piece 2
21 protrusions, 3 heating coils, 4 ferrite cores.

Claims (2)

A plurality of disk-shaped holding stands each having a protrusion formed at the center, each holding stand is mounted on one fixed substrate, and circulates between the holding stands while being hooked on the protrusion of each holding stand. A heating coil unit of an electromagnetic induction heating cooker, wherein the heating coil is wound as described above. The heating coil unit of the electromagnetic induction heating cooker according to claim 1, wherein a ferrite core is disposed on each of the holding bases so as to cross a rotating direction of the heating coil.

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