JP4366137B2 - Induction heating cooker - Google Patents

Description

  The present invention relates to an induction heating cooker that heats a metal cooking pan by applying a high-frequency current to an induction heating coil, and more particularly to a heating structure thereof.

  The induction heating cooker generates a magnetic flux by flowing a high-frequency current through the induction heating coil, generates an eddy current in the metal load (cooking pan) placed on the top surface of the induction heating coil, and the metal load is generated by the Joule heat. By self-heating itself, the metal load is efficiently heated.

  In this induction heating cooker, when a heating operation is performed, a high voltage and high current flow through the induction heating coil by a drive circuit that drives the induction heating coil, the induction heating coil generates heat, and the temperature rises significantly. It has a structure in which a cooling air is sent with a space between the pan and the induction heating coil.

  The heating structure of this conventional induction heating cooker will be described with reference to FIG.

  FIG. 3 is a cross-sectional view of the induction heating cooker, 1 is a top plate, which is made of crystallized glass having high heat resistance, and a metal cooking pan 2 is placed on the top surface thereof. Reference numeral 3 denotes a coil base made of a heat-resistant resin. An induction heating coil 4 for heating the cooking pan 2 is horizontally placed on the upper surface thereof, and is integrally bonded with a silicon seal.

  Reference numeral 5 denotes a gap spacer for creating a uniform gap 7 between the top plate 1 and the induction heating coil 4. The gap spacer 5 is formed in a substantially reverse L shape with a heat-resistant resin and is outside the outer periphery of the induction heating coil 4. Are attached at equal intervals on the coil base 3, and the horizontal portion of the upper surface is extended horizontally toward the central portion of the induction heating coil 4.

  The gap 7 is formed between the induction heating coil 4 and the top plate 1 and is necessary for flowing cooling air for cooling the induction heating coil 4.

  The conventional induction heating cooker shown in FIG. 3 has a structure suitable for heating a cooking pot made of a magnetic metal such as iron or magnetic stainless steel.

  However, in recent years, induction heating cookers have been required to heat cooking pots made of non-magnetic metals such as aluminum and copper, which have been technically difficult to heat, as one of the functional improvements due to the increasing penetration rate. Products that meet this need have been developed.

  In the induction heating cooker shown in FIG. 3 described above, when a cooking pan made of a nonmagnetic metal such as aluminum or copper is heated, there are the following problems.

  That is, when the cooking pan 2 is a metal having a low skin resistance, such as aluminum or copper, the induction heating coil 4 is heated by applying a higher voltage than before, but the high voltage at this time is the maximum. Since it reaches about 3 kV, a leakage current is generated in the cooking pan 2, and the user may get an electric shock.

  In order to solve this problem, there is a means for interposing an antistatic plate, which is a conductor, between the induction heating coil and the cooking pan. For example, Patent Document 1, Patent Document 2, and Patent Document 3 show this. .

JP 2002-56959 A

Japanese Patent Laid-Open No. Sho 61-27087 JP-A-4-209589

  However, as shown in Patent Document 1, when the antistatic plate is installed between the top plate and the cooking pan, there is a problem that the cleaning property is deteriorated because the top plate is not flat.

  In addition, when the antistatic plate is installed below the top plate as shown in Patent Document 2 and Patent Document 3 in the structure shown in FIG. 3 as a conventional example, the antistatic plate touches the induction heating coil. As a result, the cooling air passage of the induction heating coil is blocked, and the temperature of the induction heating coil rises, which is dangerous.

  Furthermore, when heating a non-magnetic cooking pan such as aluminum or copper, a heating coil configured as shown in Patent Document 4 (Japanese Patent Application Laid-Open No. 2003-115368) is provided in order to enhance the insulation performance of the wire. It is used by covering with a fluorine insulating coating.

  However, in this structure, if the induction heating coil is to be bonded to the coil base with a silicon seal, the adhesion between fluorine and silicon is poor, and a more satisfactory adhesive force may not be obtained.

  Furthermore, since a strong repulsive force is generated between the induction heating coil and a cooking pan such as aluminum or copper, the induction heating coil may be peeled off from the coil base.

In order to solve the above-mentioned problems, in claim 1 of the present invention, the top plate on which the cooking pan is placed, the induction heating coil installed below the top plate, and the interval between the induction heating coil and the top plate are uniform. In an induction heating cooker equipped with a gap spacer placed between the top plate and the induction heating coil, an antistatic plate is provided between the top plate and the induction heating coil, and the antistatic plate is held by the gap spacer. Is formed in a substantially inverted L shape with heat-resistant resin, and the horizontal part is lowered by one step from the upper surface of the rising part and extends horizontally toward the center of the induction heating coil, and the horizontal part covers the induction heating coil. It is.

  According to a second aspect of the present invention, the antistatic plate is fixed between the top plate and the induction heating coil by a gap spacer.

  With the above configuration, the antistatic plate can be fixed at a predetermined position without increasing the number of parts while maintaining the conventional performance of keeping the gap between the induction heating coil and the cooking pan uniform with the gap spacer.

  In the configuration as described above, a gap for flowing cooling air for cooling the induction heating coil can be held between the induction heating coil and the cooking pan while holding the antistatic plate.

  Furthermore, even when the adhesive performance between the induction heating coil and the coil base is insufficient only by the silicon seal, it is possible to provide an effect of suppressing the induction heating coil at the horizontal portion extending to the center side of the induction coil of the gap spacer.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 in the drawings.
FIG. 1 is a cross-sectional view of an induction heating cooker, and FIG. 2 is a perspective view of a component structure.

  In the figure, reference numeral 1 denotes a top plate, which is made of insulating crystallized glass having high heat resistance, and a metal cooking pan 2 is placed on the top surface thereof. Reference numeral 3 denotes a coil base made of a heat-resistant resin. An induction heating coil 4 for heating the cooking pan 2 is horizontally placed on the upper surface thereof, and is integrally bonded with a silicon seal.

  Although not shown, the induction heating coil 4 has a high voltage and insufficient insulation between the strands. Therefore, a fluorine-processed insulating layer is provided around the strands.

  Reference numeral 5 denotes a gap spacer for creating a uniform gap between the top plate 1 and the induction heating coil 4, which is formed in a substantially reverse L shape with heat-resistant resin, and is formed outside the outer periphery of the induction heating coil 4. A plurality of horizontal parts 5a are mounted on the base 3 at equal intervals, and the horizontal part 5a is lowered by one step from the upper surface 5c of the rising part 5b and horizontally extended toward the center part of the induction heating coil 4. I try to cover it.

  Reference numeral 6 denotes an antistatic plate, which has a conductive paint sandwiched between insulators and exhibits a function that is not induction-heated, and is placed and held on the horizontal portion 5a of the gap spacer 5 on the lower surface of the top plate 1. Has been.

  Needless to say, the antistatic plate 6 is grounded.

  Reference numeral 7 denotes a gap formed between the top plate 1 and the induction heating coil 4. The gap 7 formed by the gap spacer 5 is necessary for flowing cooling air for cooling the induction heating coil 4.

  In the above configuration, when the induction heating coil 4 is driven by the drive circuit (not shown) and the cooking pan 2 is heated, if the cooking pan 2 is a metal having a low skin resistance such as aluminum or copper, induction heating is performed. The coil 4 is heated by applying a higher voltage than before.

  At this time, since it reaches about 3 kV at the maximum, a leakage current may flow through the cooking pan 2 and the user may get an electric shock. However, an antistatic plate 6 is provided between the induction heating coil 4 and the cooking pan 2. In addition, since the antistatic plate 6 is grounded, leakage current can be prevented and electric shock to the user is prevented.

  In the present invention, a plurality of gap spacers 5 are mounted on the coil base 3 at equal intervals outside the outer periphery of the induction heating coil 4 as shown in FIGS. 1 and 2, and the horizontal portion 5a is formed on the rising portion 5b. Since it is lowered by one step from the upper surface 5c and extends horizontally toward the center of the induction heating coil 4, and the antistatic plate 6 is placed on the horizontal portion 5a that is lowered by one step, the antistatic plate 6 is predetermined without increasing the number of parts. Can be fixed in the position.

  In other words, the antistatic plate 6 is held in the height direction by the top plate 1 and the rising portion 5b of the gap spacer 5, and in the horizontal direction, the portion lowered by one step from the upper surface 5c of the gap spacer 5 is held as a wall. Is.

  In addition, since the induction heating coil 4 is covered with a fluorine-processed insulating layer, the gap spacer 5 extends toward the center of the induction coil 4 even when the adhesion performance with the coil base 3 is insufficient only by the silicon seal. The induction heating coil 4 can be suppressed by the horizontal portion 5a.

  In addition, the cooking method by induction heating is already well-known and description is abbreviate | omitted.

FIG. 1 is a cross-sectional view of an induction heating cooker according to the present invention. It is a perspective view of the same component structure. It is sectional drawing of the conventional induction heating cooking appliance.

Explanation of symbols

1 Top plate 2 Cooking pan 3 Coil base 4 Induction heating coil 5 Gap spacer 6 Antistatic plate 7 Gap

Claims (2)

The top plate (1) for placing the cooking pan (2), the induction heating coil (4) installed below the top plate (1), and the distance between the induction heating coil (4) and the top plate (1) In an induction heating cooker provided with a gap spacer (5) placed between the two to maintain a uniform thickness, an antistatic plate (6) is provided between the top plate (1) and the induction heating coil (4), The antistatic plate (6) is held by a gap spacer (5), and the gap spacer (5) is formed in a substantially inverted L shape by a heat-resistant resin, and the horizontal portion (5a) is an upper surface of the rising portion (5b). An induction heating cooker characterized in that it is lowered by one step from (5c) and extends horizontally toward the center of the induction heating coil (4), and the induction heating coil (4) is covered with the horizontal portion (5a) .   Induction heating cooking according to claim 1, characterized in that the antistatic plate (6) is fixed between the top plate (1) and the induction heating coil (4) by a gap spacer (5).

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