JP3356614B2 - Rice cooker manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a rice cooker of an induction heating system.

[0002]

2. Description of the Related Art In recent years, a rice cooker using electromagnetic induction heating has been proposed. This rice cooker is shown in FIG. In FIG. 9, reference numeral 1 denotes a main body having an openable / closable lid 2 on an upper surface, and an inner pot 3 is detachably disposed inside the main body 1.
The inside of the inner pot 3 is made of a magnetic material 4 such as iron or stainless steel, and the outside is made of a heat insulating material 5 such as wood. 6 is the inner pot 3
The storage portion 6 is formed of a molding material such as a heat-resistant plastic, and the inner pot 3 of the storage portion 6 is provided.
A heating bottom coil 7 is buried in a portion opposing the bottom of the inner pan 3, and a helical heating body coil 8 is provided in a portion opposing the side of the inner pan 3 to uniformly heat the side of the inner pan 3 of the magnetic material. And a helical heating zone coil 9 having the same shape as the heating body coil 8 is buried in a portion facing the hanging side surface of the lid 2 provided in the inner pot 3.

With the above configuration, the heating bottom coil 7,
The entire bottom and side surfaces of the inner pan 3 are uniformly heated by the heating body coil 8 and the heating band coil 9, and the food in the inner pan 3 is uniformly heated and cooked.

[0004]

However, in the above-mentioned conventional example, when producing the housing section 6 in which the heating bottom coil 7, the heating body coil 8 and the heating band coil 9 are enclosed, first, a molding die of the housing section 6 is formed. It is necessary to set each of the heating coils 7, 8, and 9. At this time, the spiral heating coils 7, 8, and 9 are set while maintaining their unstable shapes at several locations, and productivity is reduced. In addition, the heating coil 7, 8, 9 is misaligned due to the pressure at the time of resin molding and the like, and the completed storage section 6 itself is sealed, and the dimensions of the inner pan 4 and the heating coils 7, 8, 9 are varied. As a result, the inner pot 4 cannot be heated uniformly, and there is a problem that delicious rice cannot be cooked.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a plurality of strands having a diameter of 0.3 to 0.5 mm for induction heating an inner pot removably housed in a main body. as well as embedded spiral heating coil bundling, the heating co
Yl provided a plurality of radial ribs on the bottom, the back of the center
The surface becomes a base point of the radial ribs, the sensor tube for interior a sensor for controlling the temperature inside the pot by Shin set, in the coil base which is integrally molded with a non-metallic material to flow during molding of the coil base resin In order to prevent the deformation of the heating coil due to the molding pressure of the above, a gate portion at the time of forming the coil base is provided on the upper portion of the sensor cylinder, and molding resin flows from the gate portion to the upper surface of the heating coil, and The rear surface of the coil is abutted along the molding die of the coil base, and is formed by providing an exposed portion on the lower surface of the heating coil opposite to the inner pot.

[0006]

According to the first aspect of the present invention, the resin can be uniformly flowed from the sensor cylinder to the upper surface of the heating coil at the time of forming the coil base, and the heating coil can be integrally formed stably to increase the productivity. be able to.

[0007]

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In FIG. 1, reference numeral 30 denotes a main body, and an upper frame 31 is fitted into an upper opening of the main body 30. The main body 30
A pot housing portion 34 is formed by disposing a protective frame body 32 made of a metal material and a coil base 33 inside. The coil base 33 is formed of a heat-resistant material such as a synthetic resin into a cylindrical shape with a bottom.
2 and is fixed to the upper frame 31. This protective frame 3
2, a heat retaining heater 35 is fixed by an aluminum tape. An inner pot 36 is provided in the pot storage section 34, and the inner pot 36 is formed of a high conductivity material such as aluminum and a clad material made of a magnetic metal material such as ferrite stainless steel on the outer surface thereof. The inner pot 36 is detachably disposed by mounting the flange 36A on the upper surface of the upper frame 31 in a suspended state.
A gap is formed between 3 and the outer bottom of the inner pot 36.

In FIG. 2 and FIG. 3, a heating coil 37 is embedded in the coil base 33. The heating coil 37 bundles about 20 to 30 strands of a self-fusing insulating coating material having a diameter of 0.3 to 0.5 mm, and faces the bundled wire to the bottom surface and the lower side surface of the inner pot 36. The inner coil and the outer coil are respectively formed. The heating coil 37 has an exposed portion 37A on the back surface of the coil base 33.
And a plurality of radial ribs 38 are provided to shield the exposed portion 37A. A ferrite core 39, which is a high-permeability magnetic shield made of, for example, iron oxide as a main material, is embedded in the rib 38 below the heating coil 37 and with a uniform gap from the heating coil 37. In the center of the upper part of the heating coil 37 and the ferrite core 39 of the coil base 33, a gate part 33A for molding the coil base 33 is provided.
Is provided.

Reference numeral 45 denotes a circuit board for supplying a current for generating an alternating magnetic field to the heating coil 37. Reference numeral 46 denotes a board base which is fitted to the main body 30 and the upper frame 31 to fix the circuit board 45 and the operation board 47. are doing. Reference numeral 48 denotes a synthetic resin outer lid, which is rotatably supported by a hinge at the rear of the upper frame 31.

A method of manufacturing the coil base 33 according to the present embodiment configured as described above will be described. Coil base 33
At the time of molding, first, the heating coil 37 is set along the molding die of the coil base 33, and the coil base 3
3 and the heating coil 37 and the ferrite core 3
When the resin flows from the gate portion 33A provided on the upper surface of the heating member 9, the lower surface of the heating coil 37 is buried in the coil base 33 without deforming the heating coil 37 by contacting the molding die with the resin molding pressure. The dimensional accuracy can be ensured, and the rice cooking performance can be reliably ensured.

Although the present embodiment has been described with a configuration in which the ferrite core 39 is embedded in all of the plurality of radial ribs 38 disposed below the heating coil 38, the same applies when a rib in which the ferrite core 39 is not embedded is provided. Needless to say, the effect is obtained.

Embodiment 2 A second embodiment of the present invention will be described with reference to FIGS. In FIG. 4, reference numeral 50 denotes a bottomed coil base formed of a nonmetallic heat-resistant material such as a synthetic resin.
A heating coil 51 is embedded in the coil base 50. 5 and 6, a plurality of radial ribs 52 are provided below the heating coil 51. The flight core 53, which is a high-permeability material magnetic shield sintered using iron oxide as a main material, is provided on the rib 52, for example.
Embedded with a uniform gap. A sensor tube 54 is provided at the center of the coil base 50 and extends from the rear surface thereof. The sensor tube 54 is formed at a radial base point of the rib 52. The sensor cylinder 54 has a small-diameter step 54A at the upper end thereof. The small-diameter step 54A is used as a stopper, and the temperature detecting device 55 is vertically movably mounted therein. Gate 50A is provided. The configuration other than the coil base 50 is the same as that of the first embodiment, and a description thereof will be omitted.

[0013] During molding of the coil base 50 by this arrangement, the gate portion 5 provided on the upper end of the sensor tube 54
Although the resin flows into the upper surface of the heating coil 51 from 0A, the heating coil 51 comes into contact with the molding die due to the resin molding pressure, and as a result, the heating coil 51 is embedded in the coil base 50 without being deformed. Thus, the dimensional accuracy can be reliably ensured, and the productivity can be improved.

Embodiment 3 A third embodiment of the present invention will be described with reference to FIGS. FIG. 7 shows a lead wire portion of the heating coil 51 shown in FIG. 5. The heating coil 51 is embedded in the bottomed cylindrical coil base 50 made of a nonmetallic heat-resistant material such as a synthetic resin as described above. The heating coil 51 has a diameter of 0.
A self-fusing insulating coating material of 3 to 0.5 mm
Approximately 0 bundles are formed, and the inner coil and the outer coil are respectively formed by the bundled wires, and the lead wire lead-out portion 51A is provided as it is. This lead wire lead-out portion 51A is provided with a seal tape 62 partially embedded in the coil base 50 and impregnated with a varnish or the like in a polyester cloth or the like, and as shown in FIG. It is provided by being wound around the linear lead wire lead-out portion 51A two to four times. The configuration other than the coil base 50 is the same as that of the first embodiment, and a description thereof will be omitted.

According to this configuration, the coil base 50 is formed so that the lead-out portion 51A of the heating coil 51 is
It can be molded reliably without causing resin leakage. A seal tape 62 impregnated with varnish or the like is provided,
As shown in FIG. 8, it is provided by winding it about 2 to 4 times around about 20 to 30 twisted lead wire lead-out portions 51A. The configuration other than the coil base 50 is the same as that of the first embodiment,
Omitted.

With this configuration, when the coil base 50 is formed, the lead wire lead-out portion 51A of the heating coil 51 is formed.
It can be molded reliably without causing resin leakage.

Embodiment 4 Further, a fourth embodiment of the present invention will be described with reference to FIG.
In FIG. 5, on a back surface of the heating coil 51 and the ferrite core 53 embedded in the coil base 50, a motor base 74 is provided integrally with the coil base 50 so as to surround a part of the heating coil 51 and the ferrite core 53. ing. A fan motor 75 is mounted on the motor base 74, and the heating coil 51 and a circuit board (not shown) for supplying power to the heating coil 51 are mounted on the motor base 74.
The cooling air is guided by the guide ribs 74A also serving as a cooling unit. The configuration other than the coil base 50 is the same as that of the first embodiment, and a description thereof will be omitted.

With this configuration, the coil base 50 and the motor base 74 can be integrally molded, so that the material and molding time can be reduced, and the productivity can be further increased.

[0019]

As described above, according to the first aspect of the present invention, the heating coil can be integrally formed stably, and the productivity thereof can be increased.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a rice cooker according to a first embodiment of the present invention.

FIG. 2 is a back view of the rice cooker.

FIG. 3 is a cutaway sectional view of a main part of the rice cooker.

FIG. 4 is a longitudinal sectional view of a rice cooker according to a second embodiment of the present invention.

FIG. 5 is a back view of the rice cooker.

FIG. 6 is a cutaway sectional view of a main part of the rice cooker.

FIG. 7 is a cutaway rear view of the rice cooker according to the third embodiment of the present invention.

FIG. 8 is a cutaway sectional view of a main part of the rice cooker.

FIG. 9 is a longitudinal sectional view of a conventional rice cooker.

[Explanation of symbols]

 Reference Signs List 30 Main body 33 Coil base 33A Gate part 36 Inner pot 37 Heating coil 37A Exposed part 38 Rib 39 Ferrite core 50 Coil base 50A Gate part 51 Heating coil 52 Rib 53 Ferrite core 54 Sensor cylinder 61A Lead wire lead-out part 62 Seal tape 74 Motor stand 75 fan motor

Continuation of front page (72) Inventor Atsushi Tanaka 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-7-67765 (JP, A) JP-A 5-251167 (JP) JP-A-63-237919 (JP, A) JP-A-1-315979 (JP, A) JP-A-61-71581 (JP, A) JP-A-3-145106 (JP, A) 56-15592 (JP, U) Japanese Utility Model Application Hei 5-95715 (JP, U) Japanese Utility Model Application Publication No. 62-180895 (JP, U) Japanese Utility Model Application Utility Model 5-50714 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) A47J 27/00 103

Claims (1)

(57) [Claims] 1. A spiral heating coil having a wire diameter of 0.3 to 0.5 mm for bundling a plurality of strands for inductively heating an inner pot removably housed in a main body is embedded and said heating is performed.
A plurality of radial ribs are provided at the bottom of the coil ,
The rear surface becomes a base point of the radial ribs, the sensor tube for interior a sensor for controlling the temperature inside the pot by Shin set,
In a coil base integrally formed of a non-metallic material, a gate portion at the time of molding the coil base is provided at an upper portion of the sensor cylinder in order to prevent deformation of the heating coil due to a molding pressure of resin flowing in at the time of molding the coil base. The molding resin flows from the gate portion to the upper surface of the heating coil, and the back surface of the heating coil abuts along the molding die of the coil base, and is exposed on the lower surface of the heating coil opposite to the inner pot. A method for manufacturing a rice cooker comprising a part.