JPH0785959A - Coil unit of induction heating cooking apparatus - Google Patents

Abstract

PURPOSE:To eliminate any takeup jigs and reduce man-hours for the assembly by forming joints in appropriate places on a spacer, making joint in such a way as opening in the diameter enlarging direction, and providing projections for locating. CONSTITUTION:A spacer 8 consists of a plurality of spacer segments in the form of a circular arc plate, wherein the segments 8-1, 8-2 are jointed together by a joint 8-4 while the segments 8-2, 8-3 are jointed together by a joint 8-5. Projections for locating 16-1, 16-2, 16-3 are provided at one-side ends of the spacer segments 8-1, 8-2, 8-3, and insertion guide grooves 13-1, 13-2, 13-3 are furnished in positions mating with these projections. The this spacer 8 is to be installed in the middle coarse coil part of a heater coil concerned, the projections are inserted in the respective grooves, where the location takes place in such a way that the projections hitch at the termination of each groove or window of a reel 6, and thereupon an electric wire is taken up.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is particularly used in an induction heating type rice cooker, in which induction heating is performed by an induction heating coil having a dual structure in which electric wires are tightly wound on an inner peripheral portion and an outer peripheral portion and a central portion is roughened. The present invention relates to a coil unit of an induction heating cooker.

[0002]

2. Description of the Related Art A coil unit of this type of induction heating cooker is used for an induction heating type rice cooker for the purpose of finishing cooking deliciously with a strong heating force in a short time. Induction heating heats the pot of magnetic material placed on the induction heating coil by the high-frequency magnetic field generated by the induction heating coil. It is highly efficient, and only the pot heats the cooker body. It does not easily become a problem and does not have the problem of life like a resistance heater, so a large current can be applied. However, the heat generated in the pot tends to be concentrated right above the induction heating coil with a strong magnetic field, and there was a problem of uneven heating as the larger current was applied. Especially in the induction heating type rice cooker, the rice and water in the inner pot are heated to make rice, but it is very difficult for convection to occur. There was a problem that it was easy to get rice.

In order to solve such a problem, as described in Japanese Patent Laid-Open No. 1-315979, the inner peripheral portion and the outer peripheral portion of the induction heating coil are densely configured with a rough center and the outer peripheral portion is raised to the side surface. It can be seen that the heated part of the inner pot is dispersed. Further, as a structure for holding the induction heating coil in the main body, there is a structure in which a molded induction heating coil is sandwiched and held by main body constituent parts such as a protective frame bottom and a coil base, as disclosed in Japanese Patent Laid-Open No. 1-276583. Has been invented.

In the structure according to the above-mentioned conventional invention, it is necessary to first form the electric wire into a coil shape as a procedure for manufacturing the induction heating coil. Generally, this manufacturing method involves winding the wire around a reel-shaped winding jig, winding the inner circumference of the induction heating coil, and then reassembling the jig. To wind up. After that, the wires are glued together so that the wound wires do not separate and the coil shape does not collapse. The bonding is generally performed by applying a resin to the electric wire itself, allowing a large current to flow therethrough to generate heat, melting the resin, and cooling the resin to cure it. After the bonding is completed, the jig is disassembled and the induction heating coil whose molding has been completed is taken out. The induction heating coil formed by the above procedure is sandwiched and held between the components in the process of assembling the cooker body.

[0005]

SUMMARY OF THE INVENTION In the above conventional configuration,
In the process of forming the induction heating coil, it takes much time and labor to assemble and disassemble the jig, resulting in a high cost. In addition, since the formed induction heating coil is divided into the inner peripheral portion and the outer peripheral portion, there is a problem that the coil shape is deformed during transportation and storage until assembly of the main body, and stable heating performance cannot be obtained. Further, there is a problem that unless the inner peripheral portion and the outer peripheral portion of the induction heating coil are positioned, the heating distribution is varied and the performance of the induction heating cooker is greatly affected.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a reel portion provided inside an induction heating cooker body, and an inner peripheral portion and an outer peripheral portion of the reel portion. The section is equipped with an induction heating coil with a dense winding of the wire and a coarse winding of the middle section, and the wire is tightly packed in the induction heating cooker coil unit that applies high-frequency current to the induction heating coil for induction heating. A plurality of arc-shaped plate-shaped spacers are interposed between the inner peripheral portion and the outer peripheral portion of the wound induction heating coil to form the intermediate coil rough portion of the induction heating coil. This spacer is a bendable resin. Are formed separately and joined so as to open in the diameter expansion direction by separate bodies or joints, and each divided spacer is provided with a convex portion for positioning, and each reel corresponds to each convex portion. Insert a guide groove into the insert guide groove when inserting the spacer into the insert guide groove of the reel, and position the spacer so that the protrusion of the spacer catches on the end of the insert guide groove. The electric wire was wound to form the outer peripheral portion of the induction heating coil.

Further, the spacer is integrally formed of a bendable resin, and a joint portion is formed at a plurality of appropriate places so that the spacer is joined so as to open in the diameter expanding direction, and the spacer is divided into a plurality of parts, which are set at the tip of the spacer. The reel has an insertion guide groove and a window, and when the spacer is installed, the protrusion is inserted into the reel's insertion guide groove, and the spacer's protrusion catches on the reel's window. It may be positioned in this way.

[0008]

According to the above-mentioned structure of the present invention, in the procedure for manufacturing the induction heating coil, the wire is tightly wound around the core of the reel portion to form the inner peripheral portion of the induction heating coil, and the outer peripheral portion of the inner peripheral portion is A spacer is attached to the intermediate coil rough part of the heating coil of
At that time, insert the spacer convex part into the insertion guide groove part of the reel part, and position it by the convex part of the spacer being caught by the end of the insertion guide groove part or the window part provided on the reel part, winding the electric wire on the outside The outer peripheral portion of the heating coil is formed. The formation of the coil unit is completed by fixing the ends of the wound electric wires.

As described above, in the induction heating coil, the electric wire is tightly wound on the center side in the reel portion so that the inner peripheral portion is inserted into the outer peripheral portion of the circular arc plate-shaped spacer. The central rough part and the outer peripheral part are formed by tightly winding the electric wires on the outer side of the plurality of spacers, and the induction heating cooking having the double-structure induction heating coil can be easily performed without using a winding jig. The coil unit of the cooker is formed, and in the assembly process of the induction heating cooker main body, it can be directly formed without performing an assembly work for holding the induction heating coil or carrying and storing only the induction heating coil.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. 1 is a sectional view of an induction heating cooker in which an embodiment of the present invention is applied to a rice cooker, FIG. 2 is a perspective view showing an assembled state of a coil unit of the induction heating cooker, and FIG. 3 is the same. FIG. 7 is a perspective view of a spacer of the coil unit, FIGS. 4 to 6 are perspective views showing a manufacturing procedure of the coil unit, and FIG. 7 is a hinge-like joint portion of a plurality of spacers according to a second embodiment of the present invention. FIG. 11 is a perspective view showing the spacer joined together in FIG. 8, and FIGS. 8 to 10 are views showing a manufacturing procedure of the coil unit simplified in the third embodiment of the present invention.

The configuration will be described with reference to FIGS. 1, 2 and 4.
The cooker main body 1 is provided with a protective frame 2 forming an inner wall side surface and a protective frame bottom portion 3 forming an inner wall bottom surface, and an inner pan 4 is provided as a protective frame 2
It is detachably stored inside. A coil base 5 is attached to the protective frame bottom portion 3, and the protective frame bottom portion 3 and the coil base 5 are attached.
A reel unit 6 is formed with a fixed gap therebetween. The induction heating coil 7 and the spacer 8 are held in the gap of the reel portion 6.

The coil base 5 has a cylindrical portion 9 having a hollow central portion.
And the flange portion 1 extending from the cylindrical portion 9 to the outer circumference in the radial direction.
0, a part of the cylindrical part 9 is provided with an electric wire take-out part 11 which is formed by cutting out a cylinder and connected to a central hollow part, and a flange part 10 is provided with an electric wire fixing part 12 for fixing an end of an electric wire 15. Insertion guide groove portion 1 of the convex portion of the spacer 8 described later
3-1, 13-2, 13-3 and the window part 14 are provided. The induction heating coil 7 is configured by winding the electric wire 15 in a concentric shape, and the inner peripheral portion 7-where the electric wire 15 is wound a predetermined number of times.
1 and an outer peripheral portion 7-2 in which the electric wire 15 is wound another predetermined number of times, and has an inner peripheral portion 7-1 and an outer peripheral portion 7-.
The intermediate portion between the two is a coil coarse portion only connected without winding the electric wire 15.

Next, the structure of the spacer 8 will be described with reference to FIG. The spacer 8 is composed of a plurality of spacers 8-1, a spacer 8-2, and a spacer 8-3 having an arc plate shape.
The spacer 8-1 and the spacer 8-2 are joined by a joint portion 8-4, and the spacer 8-2 and the spacer 8-3 are joined by a joint portion 8-5. These are integrally formed of resin, and the widths of only the joint portions 8-4 and 8-5 are extremely narrow. This resin is a relatively flexible and bendable resin, and the spacer 8-1 and the spacer 8-
2. The joint 8-4 and the joint 8-5 are configured to bend in the direction in which the diameter of the circle formed by the inner circumference of the arc of the spacer 8-3 increases. Spacer 8-1, Spacer 8
-2, each of the spacers 8-3 is provided with a positioning projection 16-1, 16-2, 16-3 at one end thereof,
The insertion guide groove portions 13-1, 13-2, 13-3 described above are provided at positions corresponding to the convex portions 16-1, 16-2, 16-3, respectively.

Next, the manufacturing procedure will be described with reference to FIGS.

First, the protective frame bottom portion 3 and the coil base 5 are joined by screwing to form a reel portion 6 having a fixed gap between the protective frame bottom portion 3 and the coil base 5. After this screwing, or at the same time as screwing, the wire extraction part 1
The electric wire 15 is taken out from the hollow portion of the central cylindrical portion 9 of the coil base 5 from 1 (FIG. 4).

Next, when the reel portion 6 is rotated, the cylindrical portion 9
The electric wire 15 is wound around the reel portion 6 around the core, and the inner peripheral portion 7-1 of the induction heating coil 7 is formed. When the inner peripheral portion 7-1 is rotated by the number of turns, the suspension is temporarily stopped, and the convex portion 16-1 of the spacer 8-1 is inserted into the insertion guide groove portion 13-1 of the coil base 5.
Insert more (Fig. 5). Similarly, the convex portion 16-2 of the spacer 8-2 and the convex portion 16-3 of the spacer 8-3 are also inserted into the insertion guide groove portions 13-2 and 13-3 of the coil base 5, respectively.

When the reel portion 6 is rotated from this state to start winding the outer peripheral portion 7-2 of the induction heating coil 7, the convex portion 16-1 of the spacer 8-1 is biased by the electric wire 15 and the coil base 5 is inserted. It is located at the end of the guide groove portion 13-1. Similarly, the convex portion 16-2 of the spacer 8-2 and the spacer 8-3
The convex portions 16-3 of each of the insertion guide grooves 1 of the coil base 5
It is located at the end of 3-2 and 13-3. All convex parts 16-
1, 16-2, 16-3 are coil bases 5 as described above.
When the spacer 8 is located at the end of the insertion guide groove portions 13-1, 13-2, and 13-3, the spacer 8 has a ring shape with an outer peripheral diameter φD and serves as a core for winding the outer peripheral portion 7-2 of the induction heating coil 7. (Fig. 6).

Further, the reel portion 6 is rotated to rotate by the number of turns of the outer peripheral portion 7-2 of the induction heating coil 7, and the wire fixing portion 12
The electric wire 15 is taken out and fixed so as to be hooked on. After that, a large current is applied to the wound electric wire 15 to heat the electric wire 15 to melt the resin previously applied to the electric wire 15, cool the resin, and cure the resin to complete the coil unit.

As described above, in this embodiment, the spacer 8 is joined at the joint portion 8-4 and the joint portion 8-5 and can be bent in the radial direction, so that the outer peripheral portion 7 of the induction heating coil 7 can be bent.
-2 before starting winding, the convex portion 16- of the spacer 8-1
If only 1 is inserted into the insertion guide groove portion 13-1 of the coil base 5, when the reel portion 6 is rotated and the outer peripheral portion 7-2 of the induction heating coil 7 is started to be wound, the convex portion 16- of the spacer 8-1 1 is located at the end of the insertion guide groove portion 13-1 of the coil base 5 by being biased by the electric wire 15, and at the same time the spacer 8
The convex portion 16-2 of -2 has a shape such that it is biased by the electric wire 15 and is inserted into the insertion guide groove portion 13-2 of the coil base 5, and likewise when the reel portion 6 is further rotated to wind the electric wire. The convex portion 16-3 of the spacer 8-3 is also inserted into the insertion guide groove portion 13-3 of the coil base 5. This means that the spacer 8 is divided into a plurality of parts, and the joint parts 8-4 and 8-5 are provided between them.
This is one of the effects of making it possible to bend.

Further, in the coil unit in which the molding is completed and the protective frame bottom 3, the coil base 5, the induction heating coil 7 and the spacer 8 are integrated, a jig is assembled, the electric wire 15 is wound, and the jig is disassembled after molding. Moreover, since the coil unit is directly incorporated into the main body, there is no step of incorporating the induction heating coil 7 alone into the protective frame bottom portion 3 in the main body assembling step, and the number of assembling steps can be greatly reduced.

Further, since it is not necessary to disassemble the jig and carry and store it only by the induction heating coil, there is no fear that the induction heating coil 7 is deformed and the heating performance is deteriorated, the quality is improved and the carrying cost is reduced. Also, the storage location can be saved.

In the above-described embodiment, the joint portion 8-4 of the spacers 8-1, 8-2, 8-3 divided into a plurality of parts,
Although the width of 8-5 is made extremely narrow to allow bending, a spacer 8-is divided into a plurality of parts as shown in the second embodiment in FIG.
11, 8-12 and 8-13 are hinge-like joints 8-1
Even if it is configured to bend through 4, 8-15, the same effect can be obtained.

In addition, in the above-described embodiment, the positioning of the spacer 8 is performed by inserting the positioning guide portions 16-1, 16-2, 16-3 provided in the spacer 8 into the insertion guide groove portion 13 provided in the coil base 5, respectively. Although the configuration is such that it is located at the end of -1, 13-2, 13-3, a third embodiment in which the same operational effect is obtained more easily is shown in FIGS. 8 to 10.
In the figure, the part names are the same as those in FIGS. 2 to 4, 103 is the bottom of the protective frame, 105 is the coil base, 106 is the reel part, and 108.
Is a spacer, 111 is an electric wire take-out portion, 112 is an electric wire fixing portion, 113 is an insertion guide groove portion, and 116 is a positioning convex portion. Other numbers and parts having the same names are the same as those in FIGS. 2 to 4.

In the figure, the coil base 105 may have a substantially flat disk shape in terms of its role, so that the induction heating coil 7 can be cooled and the winding state can be confirmed.
A plurality of windows 114 are provided to reduce the material. The insertion guide groove portion 113 provided only at one place on the coil base 105 is formed by a groove penetrating one of the window portions 114. Moreover, the joint portion 108-
Only one position is provided with a positioning projection 116 at the tip of the spacer 108 configured to be bendable by 4, 108-5.

The manufacturing procedure of the third embodiment will be described below with reference to the drawings. Similar to the above-described embodiment, the coil base 10
The electric wire 15 is taken out from the electric wire take-out portion 111 of FIG. 5, and the electric wire 15 is attached to the reel portion 106 configured by screwing the protective frame bottom portion 103 and the coil base 105 by the number of turns of the inner peripheral portion 7-1 of the induction heating coil 7. Wind up. Next, the convex portion 116 of the spacer 108 is pushed into the window portion 114 using the insertion guide groove portion 113 of the coil base 105 as a guide. In this state, the convex portion 116 of the spacer 108 is free to move within a range other than the area where the inner peripheral portion 7-1 of the induction heating coil 7 of the window portion 114 of the coil base 105 is wound (FIG. 9).

From this state, the outer peripheral portion 7 of the induction heating coil 7 is
2 starts to be wound, the convex portion 116 of the spacer 8 is urged by the electric wire 15 toward the inner peripheral side of the window 114 in the winding direction of the electric wire 15, and as shown in FIG. The protrusion 116 located outside -1 is positioned so as to be caught by the window 114. When the electric wire 15 is further wound, the spacer 108 becomes the inner peripheral portion 7 of the induction heating coil 7.
It becomes a ring shape on the outer peripheral side of -1, and serves as a core for winding the outer peripheral portion 7-2 of the induction heating coil 7. Thereafter, similarly to the above-described embodiment, the wire 15 is rotated by the number of turns of the outer peripheral portion 7-2 of the induction heating coil 7 so as to be hooked on the wire fixing portion 112.
Take out and fix. After that, a large current is applied to the wound electric wire 15 to heat the electric wire 15 to melt the resin previously applied to the electric wire 15, cool the resin, and cure the resin to complete the coil unit.

[0027]

As described above, according to the present invention, a plurality of arcuate plate-shaped spacers are interposed between the inner peripheral portion and the outer peripheral portion of the induction heating coil in which the electric wire is wound tightly to form the induction heating coil. The intermediate coil rough portion is configured, and this spacer is formed of a bendable resin, and is configured so that it is joined so as to open in the radial expansion direction by a separate body or a joint portion,
Equipped with a convex part for positioning, an insertion guide groove is provided between the outer periphery of the reel part and a proper place in the central part, and when a spacer is attached to the rough part of the intermediate coil of the heating coil, the convex part of the spacer is inserted in the insertion guide groove part of the reel part. Since the protrusions of the spacers are positioned so that the protrusions of the spacers are hooked on the end of the insertion guide groove or the window provided on the reel, the wire is wound on the outside to form the outer peripheral portion of the induction heating coil. Since a winding jig is not required, there is no need to disassemble the jig after molding, and the coil unit wound with the induction heating coil is incorporated into the main body as it is. Since there is no step of assembling into the bottom of the protective frame, the number of assembly steps can be greatly reduced.

Further, since it is not necessary to disassemble the jig and carry and store it only with the induction heating coil, there is no fear that the induction heating coil will be deformed and the heating performance will be deteriorated. Costs and storage space can also be saved. As described above, there is an effect that the coil unit of the induction heating cooker which is inexpensive and has high quality can be provided to the consumer.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an induction heating cooker showing an example of a rice cooker according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an assembled state of a coil unit of the induction heating cooker.

FIG. 3 is a perspective view of a spacer of the coil unit.

FIG. 4 is a perspective view showing a manufacturing procedure of the coil unit.

FIG. 5 is a perspective view showing a next step of the same manufacturing procedure.

FIG. 6 is a cross-sectional perspective view showing a final step of the same manufacturing procedure.

FIG. 7 is a perspective view showing a spacer in which a plurality of spacers are joined together by a hinge-like joint in the second embodiment of the present invention.

FIG. 8 is an exploded perspective view showing the component structure of the coil unit simplified in the third embodiment of the present invention.

FIG. 9 is a cross-sectional perspective view showing the same manufacturing procedure.

FIG. 10 is a top view showing the final step of the same manufacturing procedure.

[Explanation of symbols]

6,106 Reel part 7 Induction heating coil 7-1 Inner peripheral part 7-2 Outer peripheral part 8,108 Spacer 8-1, 8-2, 8-3, 8-11, 8-12, 8-1
3 Spacers 8-4, 8-5, 8-14, 8-15, 108-4, 1
08-5 Joining part 13-1, 13-2, 13-3, 113 Insertion guide groove part 14, 114 Window part 15 Electric wire 16-1, 16-2, 16-3, 116 Convex part

Claims (4)

[Claims] 1. A reel portion disposed inside an induction heating cooker main body, and an inner peripheral portion and an outer peripheral portion of the reel portion, on which electric wires are tightly wound and an intermediate portion is roughly wound to form a two-part induction structure. In a coil unit of an induction heating cooker that includes a heating coil, and induction heating is performed by passing a high frequency current through the induction heating coil,
Spacers (8), (108) in the shape of circular arc plates are provided in the middle of the inner peripheral part (7-1) and the outer peripheral part (7-2) of the induction heating coil (7) in which the electric wire (15) is closely wound. ) Is interposed to form a rough portion of the intermediate coil of the induction heating coil (7), and the spacers (8) and (108) are jointed so as to form joints at a plurality of appropriate places so as to open in the radial expansion direction. It is provided with a convex portion for positioning, and an insertion guide groove portion is provided between the outer periphery of the reel portions (6) and (106) and a proper place of the central portion, and the inner peripheral portion (7) of the induction heating coil (7) is provided. −
When the spacers (8) and (108) are mounted on the rough portion of the intermediate coil of the heating coil (7) on the outside of 1), the spacer (8) is inserted into the insertion guide groove of the reels (6) and (106),
Insert the convex part of (108) and its spacers (8), (1
A coil unit for an induction heating cooker, characterized in that an electric wire (15) is wound outside of (08) to form an outer peripheral portion (7-2) of an induction heating coil (7). 2. The spacer (8) is integrally formed of a bendable resin, and joints (8-4), (8-
5) and spacers (8-1), (8-2), which are divided into a plurality of pieces in a state where they are joined so as to open in the diameter expansion direction,
(8-3), each spacer (8-1), (8-
2) and (8-3) are respectively provided with convex portions (16-
1), (16-2) and (16-3), each convex portion (1
6-1), (16-2), and (16-3) corresponding to the insertion guide groove portions (13-1) and (13-
2) and (13-3) are provided, and when the spacer (8) is mounted, each insertion guide groove portion (13-1) of the reel portion (6),
(13-2) and (13-3) have convex portions (16-1),
(16-2) and (16-3) are inserted, and the convex portions (16-1), (16-2) and (16- of the spacer (8) are inserted.
3) are insertion guide groove portions (13-1), (13-2), (1
The coil unit for an induction heating cooker according to claim 1, wherein the coil unit is positioned so as to be caught at the end of 3-3). 3. A plurality of spacers (8-11), (8-12), (8-1) each of which is a separate body from the spacer (8).
3) and each spacer (8-11), (8-1)
2) and (8-13) are hinge-shaped joints (8-
14) and (8-15) so as to be joined so as to open in the diameter expansion direction, and the spacers (8-11) and (8
-12) and (8-13) are provided with convex portions (16-1), (16-2) and (16-3) for positioning, respectively, and the convex portions (16-1) and (16-2) are provided. ), (16-3) corresponding to the insertion guide groove (13-1) on the reel portion (6),
(13-2) and (13-3) are provided, and the spacer (8)
When installing the reel guide (6), each insertion guide groove (13-
1), (13-2), and (13-3) have convex portions (16-
1), (16-2) and (16-3) are inserted, and the convex portions (16-1), (16-2) and (16- of the spacer (8) are inserted.
3) are insertion guide groove portions (13-1), (13-2), (1
The coil unit for an induction heating cooker according to claim 1, wherein the coil unit is positioned so as to be caught at the end of 3-3). 4. The spacer (108) is integrally formed of a bendable resin, and joints (108-
4), (108-5) is formed and is divided into a plurality of parts in a state where they are joined so as to open in the diameter expansion direction, and a projection (116) for positioning is provided at the tip of this spacer (108), The reel portion (106) is provided with an insertion guide groove portion (113) and a window portion (114), and when the spacer (108) is mounted, the convex portion (116) is inserted into the insertion guide groove portion (113) of the reel portion (106). The positioning is performed such that the convex portion (116) of the spacer (108) is caught by the window portion (114) of the reel portion (106).
A coil unit for the induction heating cooker described.