JP5887483B2 - rice cooker - Google Patents

Description

  The present invention relates to a rice cooker, and particularly to a rice cooker using electromagnetic induction as a heating source.

  Conventionally, there existed this kind of rice cookers as shown in FIG. 4 (for example, refer patent document 1). FIG. 4 is a side sectional view of a conventional rice cooker described in Patent Document 1.

  In FIG. 4, the conventional rice cooker is provided with an induction heating coil 21 that is continuously wound around two outer circumferences in advance with the bottom surface of the protective frame 20 facing upward instead of J-type ferrite. The induction heating coil 21 is divided into bar-shaped ferrites 22 and 23, and the end surfaces of the bar-shaped ferrites 22 and 23 are arranged substantially in parallel via a predetermined gap.

JP 2008-253434 A

  Magnetic polarization occurs when magnetic flux passes through the ferrite. When the ferrite structure is divided into two as a rod-like ferrite, the distance between both ends of the rod-like ferrite is shortened, and the magnetic polarization cancels out. Thus, there is a problem that the permeability of the ferrite is lowered and the coupling with the pan is deteriorated.

  In order to solve the above-mentioned problem, in the conventional rice cooker, by arranging the end faces of the rod-like ferrite substantially in parallel through a predetermined interval, the magnetic polarizations generated in different polarities on the ferrite facing surface cancel each other, The magnetic polarization is only on the side opposite to the opposite surface of the two ferrites, and the distance between the magnetic polarizations can be taken at both ends of the two ferrites.

  However, in the structure of the conventional rice cooker described in the said patent document, there existed a subject that variation was easy to generate | occur | produce in the distance of a rod-shaped ferrite opposing surface, and variation occurred in rice cooking. Further, since it is necessary to make a large gap on the ferrite facing surface in order to prevent the ferrites from contacting each other, there is a problem that the magnetic polarization cannot be sufficiently canceled and the magnetic permeability is lowered.

  This invention solves the said conventional subject, and even if it uses rod-shaped ferrite, it aims at providing the rice cooker which stabilized the rice cooking performance, without the magnetic permeability of a ferrite falling.

In order to solve the conventional problems, a rice cooker according to the present invention is provided in a pan provided detachably on a rice cooker body, a protective frame provided opposite to a lower portion of the pan, and the protective frame. together is, cooker equipped with a pot heater for heating the pot consists outer coil provided to face the lower side portion of the coil and the pan inner provided opposite to the bottom portion of the pot in the first ferrite rod-shaped and arranged in a plurality of radially facing the inside coil, the second ferrite rod-shaped and arranged in multiple several radially opposite the outer coil, further wherein the first The first ferrite and the second ferrite are projected from the upper surface and arranged in a substantially linear shape, and one or both of the first ferrite and the second ferrite have a cross-sectional shape that is substantially parallel to the opposing surface. A trapezoid so that Of ferrite and the second on the opposing surfaces of the ferrite obtained by defining the distance between the facing surfaces over the predetermined thickness of the buffer material, for first, second ferrite is rod-shaped, when the ferrite sintered Less deformation and stable dimensions. Further, the first and second ferrites are projected from the upper surface and arranged in the same straight line, the opposing surfaces of the first and second ferrites are arranged substantially in parallel, and the first and second ferrites are arranged in parallel. Since the distance between the first and second ferrites is defined by the thickness of the buffer material by interposing the buffer material on the opposite surface, the contact between the first and second ferrites can be prevented with a small gap. Since the distance between the opposed surfaces of the first and second ferrites is stabilized, the rice cooking performance is improved and stabilized.

  Furthermore, due to the presence of the buffer material, there is no need to excessively increase the distance between the first and second ferrites, and the magnetic polarization that occurs again when the magnetic flux passes through the first and second ferrites is reduced. By generating the opposite polarities on the two ferrite facing surfaces, it is possible to cancel each other efficiently. Therefore, since the magnetic polarization is only on the opposite side of the opposing surfaces of the two first and second ferrites, the distance between the magnetic polarizations can be taken, and the permeability of the first and second ferrites is reduced. It is possible to suppress this.

The rice cooker of this invention can suppress the fall of a ferrite magnetic permeability, and can aim at stabilization of rice cooking. In addition, since the distance between the first and second ferrites is defined by the thickness of the buffer material, the first and second ferrites can be prevented from coming into contact with each other with a small gap. Since the distance between the opposed surfaces of the rice is stable, the rice cooking performance is improved and stabilized.

Sectional drawing of the side surface of the rice cooker in Embodiment 1 of this invention (A)-(C) The partial side view which shows the example of arrangement | positioning of the inner ferrite of the rice cooker, and an outer ferrite Sectional drawing of the side surface of the rice cooker in the 2nd Embodiment of this invention Cross-sectional view of the side of a conventional rice cooker

1st invention is provided in the rice cooker main body so that attachment or detachment is possible, the protection frame provided facing the lower part of the pan, and provided in the protection frame, and opposed to the bottom part of the pan. of the coil and the pan inner provided Te in rice cooker with a pan heating device, the heating the pot consists outer coil provided to face the lower side surface portion, a rod-shaped facing in said coil the first ferrite disposed a plurality of radially, facing the outer coil is arranged a second ferrite rod-like double several radially from further said first ferrite and the second ferrite upper surface The first ferrite and the second ferrite are projected and arranged in a substantially linear shape, and one or both of the first ferrite and the second ferrite are trapezoidal so that the opposing surfaces are substantially parallel to each other. And the second Ferai Obtained by defining the distance between the facing surfaces over the predetermined thickness of the buffer material on the facing surface of the first, second ferrite for a rod-like, deformation during ferrite firing is small size is stabilized. Further, the first and second ferrites are projected from the upper surface and arranged in the same straight line, the opposing surfaces of the first and second ferrites are arranged substantially in parallel, and the first and second ferrites are arranged in parallel. Since the distance between the first and second ferrites is defined by the thickness of the buffer material by interposing the buffer material on the opposite surface, the contact between the first and second ferrites can be prevented with a small gap. Since the distance between the opposed surfaces of the first and second ferrites is stabilized, the rice cooking performance is improved and stabilized.

  Furthermore, due to the presence of the buffer material, there is no need to excessively increase the distance between the first and second ferrites, and the magnetic polarization that occurs again when the magnetic flux passes through the first and second ferrites is reduced. By generating the opposite polarities on the two ferrite facing surfaces, it is possible to cancel each other efficiently. Therefore, since the magnetic polarization is only on the opposite side of the opposing surfaces of the two first and second ferrites, the distance between the magnetic polarizations can be taken, and the permeability of the first and second ferrites is reduced. It becomes possible to suppress this.

A second invention is, in particular, the cushioning material of the first invention, a woven fabric made of glass fiber and polyester Le textiles, which was the thickness of about 0.3 mm, to have elasticity buffer material Therefore, the vibrations of the first and second ferrites can be efficiently absorbed and the contact noise can be prevented. Moreover, since the distance of the opposing surface of a 1st, 2nd ferrite is stabilized, rice cooking performance improves and is stabilized.

A third invention is, in particular, those of the first ferrite及 beauty the second ferrite of the first or second invention, and molded integrally with the protective frame while interposing the buffer material Because it can prevent the vibration that occurs when magnetic flux flows through the first and second ferrites, and can stabilize the distance between the first and second ferrites, it is possible to achieve both noise prevention and performance stability. It can be done.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a side sectional view of a rice cooker according to Embodiment 1 of the present invention, and FIG. 2 is a partial side view showing an arrangement example of inner ferrite and outer ferrite of the rice cooker.

  In FIG. 1, 2, the rice cooker in this Embodiment is the rice cooker main body 1, the pan 2 accommodated in the pan accommodating part 1a formed in the inside of the rice cooker main body 1, and the opening part of the rice cooker main body 1. As shown in FIG. A lid main body 3 attached to the rice cooker main body 1 so that 1d can be opened and closed, and detachably attached to the inside of the lid main body 3 (the side covering the opening 2a of the pan 2) to seal the opening 2a of the pan 2 It has a substantially disk-shaped inner lid 4 and a pot heating device 5 for induction heating the pot 2.

  The pot storage portion 1 a of the rice cooker body 1 is formed in a bottomed cylindrical shape corresponding to the shape of the substantially annular upper frame 1 b fitted into the inner periphery of the upper opening of the rice cooker body 1 and the pot 2. The protective frame 1c is integrally connected to the upper frame 1b at the upper opening side end.

  An inner coil 5a and an outer coil 5b constituting the pot heating device 5 are attached to the outer peripheral surface of the protective frame 1c. The inner coil 5a is arranged so as to face the periphery of the center of the bottom of the pan 2 via the protective frame 1c, and the outer coil 5b faces the corner of the bottom of the pan 2 via the protective frame 1c. Are arranged to be.

  An inner ferrite 6a that is a first ferrite is provided on the outer surface side of the inner coil 5a, and an outer ferrite 6b that is a second ferrite is provided on the outer side of the outer coil 5b so as to face the coil surface.

  A plurality of inner ferrites 6a and outer ferrites 6b are arranged radially, and when the inner ferrite 6a facing the inner coil 5a and the outer ferrite 6b facing the outer coil 5b are projected from the upper surface, it becomes substantially linear. They are arranged as follows.

  Both the outer end face of the inner ferrite 6a and the outer ferrite 6b have a trapezoidal side cross-sectional shape so that at least one or both of the inner ferrite 6a and the outer ferrite 6b are substantially parallel to each other. Moreover, the buffer material 7 is provided in the substantially parallel surface. In the present embodiment, the cushioning material 7 is formed of a glass cloth tape having a thickness of 0.3 with an adhesive on one side, and is attached to the opposing surface of the inner ferrite 6a or the outer ferrite 6b, and then the inner The ferrite 6a and the outer ferrite 6b are set.

  Thereby, since the inner ferrite 6a and the outer ferrite 6b are each rod-shaped, there is little deformation when the ferrite is fired, and the dimensions are stabilized. Further, the rod-like ferrite is projected from the upper surface and arranged in the same straight line, the opposed surfaces of the inner ferrite 6a and the outer ferrite 6b are arranged substantially in parallel, and the buffer material 7 is arranged on the opposed surfaces of the inner ferrite 6a and the outer ferrite 6b. Since the distance between the inner ferrite 6a and the outer ferrite 6b is defined by the thickness of the buffer material 7, the contact between the inner ferrite 6a and the outer ferrite 6b can be prevented with a small gap, and the inner ferrite 6a and the outer ferrite 6b can be prevented. Since the distance between the opposing surfaces of the ferrite 6b is stabilized, the rice cooking performance is improved and stabilized.

  Further, due to the presence of the buffer material 7, it is not necessary to excessively increase the distance between the inner ferrite 6a and the outer ferrite 6b, and the magnetic polarization generated when the magnetic flux passes through the inner ferrite 6a and the outer ferrite 6b Further, the occurrence of different polarities on the opposing surface of the outer ferrite 6b can cancel each other efficiently, so that a decrease in ferrite permeability can be suppressed.

  In this embodiment, a glass cloth tape is used as the cushioning material 7, but the same effect can be obtained if it is made of a woven fabric made of fibers of a heat-resistant material such as polyester.

  As shown in FIG. 2, as a means for arranging the end faces of the inner ferrite 6a and the outer ferrite 6b substantially in parallel, the end faces of the inner ferrite 6a and the outer ferrite 6b are opposed substantially in parallel as shown in FIG. As shown in (B), the upper surface of the inner ferrite 6a and the end face of the outer ferrite 6b are opposed substantially in parallel, and the end face of the inner ferrite 6a and the outer ferrite 6b as shown in (C). The inner surface of each may be opposed substantially in parallel. Further, in the cases shown in (B) and (C), the opposing areas of the inner ferrite 6a and the outer ferrite 6b can be made wider than the structure shown in (A), and there is an effect that the coupling of both ferrites is improved.

(Embodiment 2)
FIG. 3 shows a rice cooker according to Embodiment 2 of the present invention. In addition, the same code | symbol is attached | subjected to the part same as the rice cooker in the said Embodiment 1, and the description is abbreviate | omitted.

  As shown in FIG. 3, the rice cooker in the present embodiment has an inner ferrite 16 a and an outer ferrite 16 b in the resin forming the protective frame 15 that houses the lower portion of the pan 2 with the buffer material 17 interposed. Inserted and held.

  As described above, according to the rice cooker in the present embodiment, by integrally forming the rod-shaped ferrite of the inner ferrite 16a and the outer ferrite 16b, vibrations that occur when magnetic flux flows through the rod-shaped ferrite can be prevented. Since the distance between the two ferrites can be stabilized, it is possible to achieve both noise prevention and performance stability.

  As mentioned above, the rice cooker concerning this invention is excellent in rice cooking performance, and can be applied to the various rice cookers heated by induction heating.

DESCRIPTION OF SYMBOLS 1 Rice cooker main body 1c, 15 Protective frame 2 Pan 5 Pan heating apparatus 5a Inner coil 5b Outer coil 6a, 16a Inner ferrite (first ferrite)
6b, 16b Outer ferrite (second ferrite)
7, 17 cushioning material

Claims (3)

A pan provided detachably on the rice cooker body, a protective frame provided opposite to the lower part of the pan, and an inner coil provided on the protective frame and provided opposite the bottom surface of the pan and in rice cooker equipped with a pot heater for heating the pot consists outer coil provided to face the lower side surface portion of said pot,
The first ferrite rod-shaped and arranged in a plurality of radially facing the inside coil, the second ferrite rod-shaped and arranged in multiple several radially opposite the outer coil, further said first ferrite And the second ferrite are projected from the upper surface and arranged in a substantially linear shape, and the cross-sectional shape of one or both of the first ferrite and the second ferrite is made substantially parallel to the opposing surface. A rice cooker in which the distance between the opposing surfaces is defined on the opposing surfaces of the first ferrite and the second ferrite via a buffer material having a predetermined thickness . The cushioning material is a woven fabric made of glass fiber and polyester Le textiles, rice cooker according to claim 1 in which the thickness of about 0.3 mm. Cooker according to the first ferrite及 beauty the second ferrite, in claim 1 or 2 was molded integrally with the protective frame in a state that said cushioning material is interposed.

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