JP2005166390A - Induction heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an induction heating cooker with improved magnetic field leakage prevention effect. <P>SOLUTION: The induction heating cooker has a heating coil 1 for induction heating, a magnetic field shielding member 2 located at an outer periphery of the heating coil 1, and a heating coil holding stand 4 located under the heating coil 1 through a magnetic material 3. A holding part 2a made of the magnetic material 3 is formed so as to be along the under surface of the heating coil 1 on the magnetic field shielding member 2, whereby, breakage of the magnetic material 3 can be avoided, and the magnetic field leakage prevention effect can be improved by a combined effect of the magnetic material 3 and the magnetic field shielding member 2. By forming the holding part 2a of the magnetic material 3 by the shielding member 2, the amount of resin material used and the weight of the heating coil unit are reduced, and further, heating of a case body of equipment caused by the magnetic field leaked downward from the heating coil 1 can be prevented, a magnetic field shield plate for aluminium for preventing heating is not required and the thickness of the cooker can be reduced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an induction heating cooker.

  Conventionally, this type of induction heating cooker has a configuration in which a conductive member is attached so as to surround the outer periphery of the heating coil in order to suppress leakage of the magnetic field generated from the heating coil to the periphery (for example, Patent Documents 1 and 2).

  As shown in FIGS. 6 and 7, the heating coil 11 is placed on a heating coil holding base 12 molded of resin and fixed with an adhesive such as silicon.

  Further, the heating coil holding base 12 incorporates magnetic bodies 13 arranged radially therein by integral molding. The magnetic body 13 absorbs the spread of the magnetic field generated from the heating coil 11.

Further, a groove is provided on the outer periphery of the heating coil holding base 12, and a magnetic field shield member 14 made of aluminum is placed in this groove. The magnetic field shield member 14 absorbs the magnetic field generated by the heating coil 11 and reduces the influence of the magnetic field on other devices in the vicinity of the induction heating cooker body.
JP 2002-319479 A JP-A-8-250272

  However, in the configuration of the conventional induction heating cooker, although leakage of the magnetic field is prevented, since the magnetic body 13 is molded integrally with the heating coil holding base 12, there is a problem that the magnetic body 13 is easily damaged. It was.

  Further, in the induction heating cooker of the conventional example, the casing 15 is often formed of iron-based magnetic sheet metal to ensure strength, but the casing is caused by a magnetic field leaking downward from the heating coil 11. In order to prevent 15 from being heated, the magnetic field shield plate 16 made of aluminum has to be placed below the heating coil 11.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide an induction heating cooker in which the effect of preventing a leakage magnetic field is improved by a synergistic effect of a magnetic body and a magnetic field shield member.

  In order to achieve the above object, an induction heating cooker according to the present invention includes a heating coil for performing induction heating, a magnetic field shield member positioned on the outer periphery of the heating coil, and a magnetic material below the heating coil. The magnetic field shield member is provided with a holding portion for the magnetic body formed along the lower surface of the heating coil.

  With such a configuration, damage to the magnetic body during the manufacturing process can be avoided, and the effect of preventing the leakage magnetic field can be improved by the synergistic effect of the magnetic body and the magnetic field shield member. An induction heating cooker is obtained.

  The induction cooking device of the present invention can avoid damage to the magnetic body during the manufacturing process, eliminate problems such as poor connection or disconnection due to electrical connection of the magnetic shield member, and can be reduced in weight and thickness. Furthermore, the effect of preventing the leakage magnetic field can be improved by the synergistic effect of the magnetic body and the magnetic field shield member.

  An embodiment of the present invention includes a heating coil for performing induction heating, a magnetic field shield member positioned on the outer periphery of the heating coil, and a heating coil holding table disposed below the heating coil via a magnetic material. The magnetic field shield member is provided with a magnetic body holding portion formed along the lower surface of the heating coil to improve the effect of preventing leakage magnetic field by the synergistic effect of the magnetic body and the magnetic field shield member. The effect of the magnetic field shield made can be obtained.

  Moreover, damage to the magnetic body can be avoided by eliminating the integral molding of the magnetic body and the heating coil holder.

  By forming the magnetic body holding portion with a magnetic shielding member, the amount of resin material used is reduced, and the heating coil unit including the heating coil, the heating coil holding base, the magnetic body, and the magnetic shielding member is reduced in weight. . In addition, since the electrical connection of the magnetic field shield member is unnecessary, problems such as connection failure or disconnection due to electrical connection can be eliminated.

  Even if the casing is made of iron-based magnetic sheet metal, there is a magnetic body holding part formed along the lower surface of the heating coil, so that the casing is caused by a magnetic field leaking downward from the heating coil. The body can be prevented from being heated, and the aluminum magnetic field shield plate for preventing heating is not required, and the thickness can be improved.

  Furthermore, the configuration in which at least one of the plurality of magnetic bodies is held by the heating coil holding base increases the number of magnetic bodies and the degree of design freedom when arranging them.

  In addition, since the concave portion is provided in the holding portion of the magnetic body and the magnetic body having a thickness equal to or greater than the height of the concave portion is placed in the concave portion, positioning can be performed when the magnetic body is disposed. Further, the thermal efficiency can be improved by providing a distance between the heating coil and the magnetic field shield member.

  Furthermore, the magnetic body can be cooled by adopting a configuration in which a hole is provided in the bottom surface of the concave portion of the magnetic body holding portion.

  The magnetic field shield member is formed by connecting an outer ring located on the outer periphery of the heating coil and an inner ring located on the inner periphery with holding portions formed radially, and a notch is formed in a part of the inner ring. By forming the portion, the current flow loop is cut and self-heating of the magnetic field shield member can be suppressed.

  On the other hand, by providing a coil holder along the upper and outer circumferences of the heating coil, the coil holder can press and hold the heating coil and can be used as an insulator between the heating coil and the magnetic field shield member located on the outer circumference.

  Moreover, the intensity | strength of a heating coil unit rises by setting it as the structure which fastens a coil holder, a magnetic field shield member, and a heating coil holding stand together. In addition, individual positional relationships are determined, and the heating power, leakage magnetic field, and thermal efficiency can be stabilized.

  And the number of attachment bodies and an assembly man-hour can be reduced by tightening at once.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

(Example 1)
1 and 2 show an induction heating cooker according to a first embodiment of the present invention.

  In FIG. 1, a heating coil 1 for performing induction heating, a magnetic shielding member 2 positioned on the outer periphery of the heating coil 1, and a heating coil holder 4 disposed below the heating coil 1 via a magnetic body 3 The magnetic field shield member 2 is radially provided with holding portions 2a of the magnetic body 3 formed along the lower surface of the heating coil 1. Therefore, the plurality of magnetic bodies 3 are also arranged radially.

  According to the above configuration, a magnetic field shield with improved leakage magnetic field prevention effect can be obtained by the synergistic effect of the magnetic body 3 and the magnetic field shield member 2.

  Further, by eliminating the integral molding of the magnetic body 3 and the heating coil holding base 4, the damage of the magnetic body 3 can be reduced.

  By forming the holding portion 2a of the magnetic body 3 with the magnetic field shield member 2, the amount of resin material used is reduced, and the heating coil unit is reduced in weight. In addition, since the electrical connection of the magnetic field shield member is unnecessary, problems such as connection failure or disconnection due to electrical connection can be eliminated.

  Further, since the holding portion 2a of the magnetic body 3 formed along the lower surface of the heating coil 1 exists, even if the housing is formed of a sheet metal of an iron-based magnetic body, it leaks downward from the heating coil 1. The heating of the housing by the magnetic field can be prevented, and the aluminum magnetic field shield plate for preventing heating is not necessary, and the thickness can be improved.

  Here, although the magnetic bodies 3 are held by the magnetic field shield member 2, the number of the magnetic bodies 3 and the design when the magnetic bodies 3 are arranged by the configuration in which at least one of the plurality of magnetic bodies 3 is held by the heating coil holding base 4. The upper degree of freedom spreads.

(Example 2)
Next, a second embodiment of the present invention will be described with reference to FIG.

  In FIG. 3, the end surface of the holding portion 2a of the magnetic body 3 of the magnetic field shield member 2 is cut and raised or deep-drawn to provide a concave portion 2b in the holding portion 2a of the magnetic body 3, and the concave portion 2b has a height equal to or higher than that height. The magnetic body 3 having a thickness of 1 is placed. Thereby, when arrange | positioning the magnetic body 3, it can utilize for positioning. Moreover, the thermal efficiency can be improved by providing a distance between the heating coil 1 and the magnetic field shield member 2.

  Furthermore, the magnetic body 3 can be cooled by adopting a configuration in which the hole 2c is provided in the bottom surface of the concave portion 2b of the holding portion 2a of the magnetic body 3. The magnetic field shield member 2 is configured by connecting an outer ring 2d positioned on the outer periphery of the heating coil 1 and an inner ring 2e positioned on the inner periphery with holding portions 2a formed radially, and the inner ring A notch 2f was formed in a part of 2e.

  According to this configuration, the loop of the current flowing through the magnetic field shield member 2 is cut, and the self-heating of the magnetic field shield member 2 can be suppressed.

(Example 3)
Next, a third embodiment of the present invention will be described with reference to FIGS.

  A coil holder 5 is provided along the upper and outer circumferences of the heating coil 1, and the coil holder 5, the magnetic shielding member 2, and the heating coil holding base 4 are fastened together by a mounting body 6 such as a screw.

  With the above configuration, the heating coil 1 is pressed and held by one component of the coil holder 5, and the outer peripheral edge thereof faces the heating coil 1 and the magnetic field shield member 2 positioned on the outer periphery as an insulator between them. There is an effect.

  In addition, the strength of the heating coil unit is increased by fastening together with the attachment body 6. And the number of attachment bodies 6 and an assembly man-hour can be reduced by tightening at once. Furthermore, individual positional relationships are determined, and the heating power, leakage magnetic field, and thermal efficiency can be stabilized.

  As described above, the synergistic effect of the magnetic body and the magnetic field shield member according to the present invention can improve the effect of preventing the leakage magnetic field, and further reduce the weight and thickness, so that it can be applied to cooking utensils such as IH cooking heaters. It can be used.

The principal part top view of the induction heating cooking appliance in Example 1 of this invention The principal part longitudinal cross-sectional view of the induction heating cooking appliance in Example 1 of this invention (A) Top view of the magnetic field shield member of the induction heating cooker in Example 2 of this invention (b) The principal part longitudinal cross-sectional view of the magnetic field shield member The principal part top view of the induction heating cooking appliance in Example 3 of this invention The principal part longitudinal cross-sectional view of the induction heating cooking appliance in Example 3 of this invention Main part plan view of a conventional induction heating cooker Main part exploded longitudinal sectional view of a conventional induction heating cooker

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heating coil 2 Magnetic shielding member 2a Holding part 2b Recessed part 2c Hole 2d Outer ring 2e Inner ring 2f Notch 3 Magnetic body 4 Heating coil holder 5 Coil holder

Claims (7)

A heating coil for performing induction heating; a magnetic field shield member positioned on an outer periphery of the heating coil; and a heating coil holding base disposed below the heating coil via a magnetic material, the magnetic field shield member having An induction heating cooker provided with a holding part for the magnetic body formed along the lower surface of the heating coil. The induction heating cooker according to claim 1, wherein at least one of the plurality of magnetic bodies is configured to be held by a heating coil holding stand. The induction heating cooker according to claim 1, wherein a concave portion is provided in the holding portion, and a magnetic body having a thickness equal to or greater than the height of the concave portion is placed in the concave portion. The induction heating cooker according to claim 3, wherein a hole is provided in the bottom surface of the recess. The magnetic field shield member is configured by connecting an outer peripheral ring located on the outer periphery of the heating coil and an inner peripheral ring located on the inner periphery with a radially formed holding portion, and a cutout portion is formed in a part of the inner peripheral ring. The induction heating cooker according to any one of claims 1 to 4, wherein the is formed. A coil holder is provided along the upper and outer circumferences of the heating coil, and the coil holder presses and holds the heating coil and is used as an insulator between the heating coil and a magnetic field shield member located on the outer circumference. The induction heating cooker according to any one of the above. The induction heating cooker according to claim 6, wherein the coil holder, the magnetic field shield member, and the heating coil holding base are fastened together.

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