JP2012043669A - Heating coil unit for electromagnetic induction heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating coil unit which can suppress increase in production cost even if an insulating plate and a support base corresponding to a shape of a cooker bottom face are produced.SOLUTION: A heating coil unit hold base for the electromagnetic induction heating cooker comprises a heating coil 1 formed of a Litz wire wound in a concentric fashion, a plurality of ferrite materials 4 restricting leakage of electromagnetic induction noise generated from the heating coil 1, a plurality of hold bases 3 holding the heating coil 1 and each having a shape of a substantially rectangular solid or of a substantially cube inside of which the ferrite material 4 is inserted, and a support base 2 on which a plurality of flat and rod-like ribs are formed from the center of a substantially square in radial directions and in which the hold bases 3 are bonded at potions of the ribs determined by a diameter of the heating coil 1. A heating coil unit for the electromagnetic induction heating cooker has a heating coil unit hold base bonded to a predetermined position.

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 surface to be heated of various cooking utensils such as pots, pans, frying pans and the like forms a substantially circular shape, the generally circular shape is generally along the shape of the bottom surface. Heating coil units are widely used.

A configuration of a conventional heating coil unit will be described with reference to FIGS.
As shown in FIG. 7, the heater coil 1 formed by winding the litz wire 5 in a concentric manner is placed on the upper surface of the insulating plate 7 in FIG. Is supported by a plurality of (for example, four) holding bases 8 positioned by pins or the like on a support base 9 made of a heat resistant resin molded product.

  The holding base 8 shown in FIGS. 7 and 8 is fitted and positioned so as to surround the periphery of the substantially rectangular parallelepiped ferrite 4 that absorbs the downward magnetic field lines from the heating coil, and the positional relationship with the heating coil 1 is made constant. I keep it.

  Thus, since the heating coil 1 of the conventional electromagnetic induction heating cooking appliance is formed in a substantially circular heating coil 1 so as to match the shape of the bottom surface of the cooking utensil, the heating coil 1 is matched to this shape. The shape of the insulating plate 7 on which is mounted is determined.

  However, in the electromagnetic induction heating cooker used as a commercial cooker, the number of shipments is less than that for general household use, and the shape of the insulating plate 7 and the holding stand are set according to the shape of the bottom surface of the cooking utensil used. If the mounting position of 8 is changed, there is a problem that the man-hour for the change greatly increases.

  In the electromagnetic induction heating cooker described in Patent Document 1, the configuration of the heating coil unit described above is described.

JP 2007-157614 A

In an electromagnetic induction heating cooker for business use with a small number of units sold, if you use an insulating plate, a support base, etc. with a shape corresponding to the size of the bottom of the cooking device such as a pot, pan, frying pan etc. to heat, It is necessary to manufacture the support stand individually, which increases the manufacturing cost. In particular, an insulating plate (coil plate) that requires an area equal to or larger than that of the heating coil is expensive, and if the shape is changed according to individual requirements, the cost is greatly increased.
Furthermore, in the support base that is inserted and positioned so as to surround the periphery of the ferrite, since the ferrite cannot be placed at the optimum position on the lower side of the heating coil in accordance with the change in the coil diameter of the heating coil, it is generated in the heating coil. Electronic components such as the inverter cannot be protected from electromagnetic induction noise.

  Therefore, an object of the present invention is to provide a heating coil unit that can suppress an increase in manufacturing cost even if an insulating plate and a support base corresponding to the shape of the bottom surface of the cooker to be used are created.

  In order to solve the above-mentioned problem, the invention of claim 1 is a heating coil formed by winding litz wires in a circle and a plurality of ferrites that limit leakage of electromagnetic induction noise generated from the heating coil. And a plurality of holding bases for inserting the ferrite into a substantially rectangular parallelepiped or a substantially cube holding the heating coil, and a plurality of flat rod-shaped ribs radially from a substantially square center to form a diameter of the heating coil A heating coil unit for an electromagnetic induction heating cooker, comprising: a support base for adhering the holding base at a position of the rib determined by

  The invention according to claim 2 is the heating coil unit of the electromagnetic induction heating cooker according to claim 1, characterized in that four to ten ribs are formed radially from the center of the support base.

  According to the first aspect of the present invention, since the heating coil is supported by a plurality of holding bases incorporating ferrite without using an insulating plate that supports the heating coil, insulation having a shape corresponding to the size of the bottom surface of the cooker There is no need to manufacture a plate, a support base, or the like. Furthermore, since an insulating plate (coil plate) that requires an area equal to or larger than that of the heating coil is not used, the cost is greatly reduced.

  According to the second aspect of the present invention, in addition to the effect of the first aspect, the ferrite can be placed at an optimum position below the heating coil in accordance with the coil diameter of the heating coil. Therefore, it is possible to protect electronic parts such as an inverter.

It is sectional drawing of the heating coil unit of the electromagnetic induction heating cooking appliance concerning Embodiment 1 of this invention. It is a top view of the heating coil unit shown in FIG. It is detail drawing of the holding stand shown in FIG. It is detail drawing of the support stand shown in FIG. 6 is a plan view of a heating coil unit according to Embodiment 2. FIG. It is sectional drawing of the heating coil unit of a prior art. It is a top view of the heating coil unit shown in FIG. It is detail drawing of the support stand of a prior art.

“Embodiment 1”
FIG. 1 is a cross-sectional 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.

  The heating coil unit shown in FIG. 1 includes a support base 2 made of a nonmagnetic metal (for example, an aluminum plate), and the support base 2 is formed in a substantially square shape in plan view shown in FIG. Flat rod-shaped ribs 10 are formed radially from the center at a plurality of locations (for example, 8 locations), and substantially fan-shaped notch holes 11 are formed between the ribs 10 to reduce weight and save material. ing.

  The holding table 3 shown in FIG. 3 is made of an insulating phenol resin, has a substantially rectangular parallelepiped shape or a substantially cubic shape, and is provided with a buried hole 6 penetrating through the side surface thereof, and a flat rod-shaped ferrite 4 is buried in the buried hole 6. Insert into and fix with silicone adhesive. In addition, one ferrite 4 is inserted into one holding table 3, but when it is desired to increase the inductance for matching with the inverter circuit, a plurality of ferrites 4 are inserted into one holding table 7. You may be able to wear it.

  A holding base 3 in which a flat bar-like ferrite 4 is inserted into the rib 10 (e.g., 8 locations) shown in FIG. 2 to limit the external leakage of electromagnetic induction noise is fixed to each rib 10 determined by the diameter of the heating coil 1. The holding table 3 is bonded to the position. And the heating coil 1 formed by winding a litz wire in a concentric manner on the upper surface of the eight holding bases 3 is placed. As the heating coil 1 in this case, a litz wire that reduces the skin effect in a high frequency region is applied. Further, although not shown in the drawing, an adhesive fixing silicon resin is applied between the holding table 3 and the heating coil 1 in order to prevent the heating coil 1 from being displaced.

When mounting the heating coil 1 having a small coil diameter on the holding table 3,
The number of windings of the heating coil 1 is reduced. At this time, the heating coil is moved by moving the holding table 3 provided on the upper surface of the rib 10 shown in FIG. The holding table 3 can be installed on the rib 10 at an optimal position where the external leakage of the electromagnetic induction noise generated at 1 can be limited.

Conversely, when the heating coil 1 having a large coil diameter is mounted on the holding table 3,
Since the number of windings of the heating coil 1 is increased, the heating coil is moved by moving the holding table 3 provided on the upper surface of the rib 10 shown in FIG. The holding table 3 can be installed on the rib 10 at an optimal position where the external leakage of the electromagnetic induction noise generated at 1 can be limited.

  At this time, a slide mechanism may be provided on the upper surface of each rib of the support table 2, the holding table 3 may be placed on the slide mechanism, and the holding table 3 may be slid to a position determined according to increase or decrease of the coil diameter. Then, silicon resin or the like is applied to the surface of the heating coil 1 and bonded to the upper surfaces of the eight holding bases 3 so that the heating coil 1 is not displaced.

  From the above, since the heating coil 1 is held only by the plurality of holding bases 3 without using the insulating board that supports the heating coil 1, an insulating board, a support base, etc. according to the dimensions of the bottom surface of the cooker are individually manufactured. There is no need to do it. Furthermore, it is not necessary to use an expensive insulating plate that requires an area equal to or larger than that of the heating coil, and the cost is greatly reduced.

  Since the holding table 3 contains the ferrite 4, electromagnetic waves generated from the heating coil 1 can be obtained by placing the holding table 3 at the optimal position of the rib 10 of the support table 2 and holding the heating coil 1. Electronic components such as the inverter can be protected from inductive noise.

  Furthermore, the support base 2 may form 4 to 10 flat rod-shaped ribs radially from the center, and determine the number of ribs according to the diameter of the heating coil.

“Embodiment 2”
FIG. 5 is a plan view of the heating coil unit according to the second embodiment of the present invention. The same reference numerals as those in FIGS. 1 to 4 have the same functions, and therefore description thereof will be omitted. Only different reference numerals will be described.

  5 is fixed to a predetermined position by bonding or the like on the upper surface of the rib 10 in order to limit the external leakage of magnetic flux to the rib 10 (for example, 8 locations) shown in FIG. . And the heating coil 1 formed by winding a litz wire in a concentric manner on the upper surface of the eight holding bases 3 is placed. As the heating coil 1 in this case, a litz wire that reduces the skin effect in a high frequency region is applied. Further, although not shown, a silicon resin for adhesion and fixing is applied between the holding table 3 and the heating coil 1 in order to prevent the heating coil 1 from being displaced.

When the heating coil 1 whose coil diameter forms an elliptical shape is mounted on the holding table 3,
As shown in FIG. 5, the holding table 3 is moved to an optimal position in the outer direction of the support table 2 on the long side of the heating coil 1, and the holding table 3 is the center of the support table 2 on the short side of the heating coil 1. By moving to the optimum position in the direction, the holding table 3 can be placed on the rib 10 at the optimum position for limiting the external leakage of magnetic flux noise generated from the heating coil 1.

  And the silicon resin etc. are apply | coated to the surface and it adhere | attaches on the holding stand 3 so that the position shift of the heating coil 1 may not arise.

  From the above, even in the heating coil 1 having a different shape wound in an elliptical shape, the heating coil can be held only by a plurality of holding bases, so that an expensive insulating plate that requires an area equal to or larger than the heating coil is not used. And cost is greatly reduced.

  Further, the present invention is not limited to the configuration shown in FIGS. 1 to 5, and various modifications can be made without departing from the spirit of the present invention. For example, in the first and second embodiments, the holding table 3 has a substantially square shape in plan view, but is not limited to such a shape, and may be a polygon such as a hexagon, an octagon, or a decagon.

DESCRIPTION OF SYMBOLS 1 Heating coil 2 Support stand 3 Holding stand 4 Ferrite 5 Litz wire 6 Embedded hole 7 Insulating plate 8 Holding stand 9 Support stand 10 Rib 11 Notch hole

Claims (2)

  A heating coil formed by winding a litz wire in a concentric circle, a plurality of ferrites that limit leakage of electromagnetic induction noise generated from the heating coil, and a substantially rectangular parallelepiped or a substantially cube holding the heating coil A plurality of holding bases for inserting the ferrite; and a support base for forming a plurality of flat rod-shaped ribs radially from a substantially square center and bonding the holding bases to the positions of the ribs determined by the diameter of the heating coil; A heating coil unit of an electromagnetic induction heating cooker, comprising:   The heating coil unit of the electromagnetic induction heating cooker according to claim 1, wherein the support base forms four to ten ribs radially from the center.

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