JP3569646B2 - rice cooker - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a rice cooker used for general household or business use.
[0002]
[Prior art]
Conventionally, this type of rice cooker has, for example, a configuration as shown in FIG. In the figure, reference numeral 1 denotes a cylindrical body having an open upper surface. Inside the body 1, a protective frame 2 serving as an inner pot storage portion is provided. The upper end of the protective frame 2 is engaged with the inside of the upper end of the body 1.
[0003]
Reference numeral 3 denotes an inner pot in which an outwardly projecting flange 4 is formed in an upper end opening. The inner pot 3 is detachably mounted in the protective frame 2 by placing the flange 4 on the upper surface of the upper frame 23 in a suspended state. It is arranged in. An induction coil 5 is provided outside the protection frame 2, and the induction coil 5 is inserted into a lower part of the outer periphery of the protection frame 2 so that a distance to an outer peripheral surface of the inner pot 3 is constant.
[0004]
Reference numeral 7 denotes an outer cover made of a synthetic resin. The outer cover 7 is rotatably supported via a pin 9 on a hinge member 8 integrally formed on an upper portion of the upper frame 23. Reference numeral 10 denotes an inner cover, and the inner cover 10 is fixed to the inner surface of the outer lid 7. A detachable heating plate 11 as a heating element is installed on the inner cover 10, and an induction coil 12 is located above the heating plate 11. The heating plate 11 generates heat by the electromagnetic action of the induction coil 12. Further, a sensor 14 for detecting the temperature of the heating plate 11 is pressed against the heating plate 11 to adjust the temperature of the heat radiating plate 11.
[0005]
Reference numeral 16 denotes an engaging member which is located on the opposite side of the hinge member 8 and is integrally formed on the upper end portion of the protection frame 2. An engaging lever 17 is attached to the outer lid 7 by a pin 18 so as to face the engaging member 16. Is instructed to be rotatable via the. When the outer lid is closed, the pot packing 20 is pressed against the flange 4 of the inner pot 3 to seal the inner pot 3.
[0006]
Numeral 24 denotes a steam cylinder, which prevents squirt from leaking outside. Reference numeral 25 denotes a control board, which controls input and output of the current to the induction coil 12 and signals of the operation display unit 26. A cooling fan 27 cools the control board 25 and the induction coil 5.
[0007]
[Problems to be solved by the invention]
In recent years, the situation of rice cookers has become a trend of society in which energy saving and resource saving together with the trend of compact rice cookers have been performed. From this viewpoint, the distance between the heating plate and the induction coil may be reduced in order to reduce the thickness of the lid. At this time, the heating plate in the outer lid generates a magnetic field due to electromagnetic induction during induction heating, and the heating plate vibrates. Then, there is a problem that sound is generated. In addition, if the heating plate is made thinner, there is a problem that the generation of sound is further increased.
[0008]
The present invention makes it possible to reduce the distance between a heating plate and an induction coil and solve the above-mentioned problems, thereby enabling a compact rice cooker that saves energy and resources.
[0009]
[Means for Solving the Problems]
A body having a inner bowl, an outer lid covering the upper body, the lower surface the outer lid, set up detachable heating plate with an integrated pan gasket which faces the inner bowl flange, heating induces the heating plate An induction coil to be provided in the outer lid, and a contact protrusion for suppressing the backlash of the heating plate that suppresses the movement of the detachable heating plate is provided on one of the lower surface of the detachable heating plate and the lower surface of the outer cover, thereby suppressing the backlash. Are always in contact with the outer lid and the detachable heating plate.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Installation invention of claim 1, wherein a body having a inner bowl, an outer lid covering the upper body, the lower surface said outer cover, a removable heating plate with an integrated pan gasket which faces the inner bowl flange portion and comprises an induction coil for inductively heating the heating plate in the outer lid, the abutment projection of the hotplate looseness suppressed to suppress the movement of the detachable heating plate, one of said detachable heating plate and the outer lid lower surface On the one hand, the rattling suppressing projection is always in contact with the outer lid and the detachable heating plate, so that the unique vibration frequency of the lid heating plate and the product itself can be shifted to generate sound. And vibration of the heating plate can be suppressed.
[0011]
【Example】
(Example 1)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In the figure, reference numeral 31 denotes a substantially cylindrical body whose upper surface is open. An upper frame 32 fits into the opening of the body 31. Inside the body 31, a pot housing portion is formed by the protection frame 33 and the coil base 34. The coil base 34 is formed in a bottomed cylindrical shape, and is fixed to the upper frame 32 via the protective frame 33 at the upper end of the coil base 34.
[0012]
Reference numeral 35 denotes a body coil fixed to the protection frame 33. Reference numeral 36 denotes an inner pot having an outwardly projecting flange formed at the upper end opening. The inner pot 36 has the flange mounted on the upper surface of the upper frame 32, and is detachably attached to the inner pot 36 storage portion. An induction coil 37 is inserted in the coil base 34, and the innermost and outermost turns of the induction coil 37 are densely wound.
[0013]
Reference numeral 38 denotes a circuit board for supplying a current for generating an alternating magnetic field to the induction coil 37.
[0014]
Reference numeral 43 denotes an outer lid made of a synthetic resin. The outer lid 43 is rotatably supported via a pin 45 on a hinge member 44 integrally formed on the rear portion of the upper frame 32, and is urged by a lid spring 46. .
[0015]
Reference numeral 47 denotes a pot packing 53 attached / detachable heating plate, which is attached to an outer lid cover 48 constituting the lower surface of the outer lid 43. Further, an induction coil 49 for inductively heating the heating plate 47 is provided on the outer lid cover 48. Here, the heating amount of the heating plate 47 is determined by the magnitude of the current supplied to the induction coil 49 and the number of turns of the induction coil 49 in the same manner as the heating principle of the electromagnetic cooker. The effect of the heating plate 47 requires as strong a heating power as possible to exert the oven effect from above the rice.
[0016]
Therefore, the heating plate 47 is vibrated and heated by an alternating magnetic field of 25 kHz in the case of the present invention by the action of a magnetic field applied to the induction coil 49, but if a larger heating amount is to be obtained, the heating plate is heated. The vibration of 47 increases. Further, the sound level increases in inverse proportion to the distance between the induction coil 49 and the heating plate 47.
[0017]
In such a situation, in order to reduce the size of the lid and achieve compactness, it is necessary to lower the position of the induction coil 49 in the lid and the distance to the heating plate 47 as a matter of course. This increases the vibration of the heating plate 47 and causes noise, which is a major factor in hindering compactness.
[0018]
In order to solve such a problem, the present invention has a rattling suppressing means for suppressing the movement of the heating plate 47 and eliminating generation of sound. This rattling suppression means can also solve the generation of noise that is generated by making the heating plate 47 thinner, and has the advantage of enabling a resource saving configuration due to a reduction in plate thickness that could not be achieved conventionally.
[0019]
The distance between the heating plate 47 and the induction coil 49 also affects the heating effect, and, needless to say, the shorter the distance, the more efficiently the heating is performed, and the unnecessary energization can be eliminated. This means that the current value to the induction coil 49 can be set smaller in the configuration of the present invention, so that the temperature in the outer lid 43 can be made lower than before, and the selection of control board components and the temperature heat generation can be reduced. It can also exhibit effects such as energy saving and inexpensive component selection. Hereinafter, the rattling suppressing means of the heating plate 47 of the present invention will be described in detail.
[0020]
As an alternative, as shown in FIGS. 2 and 3, several projections 48a are formed on the lower surface of the outer cover 48 on the heating plate 47 side. When the heating plate 47 is attached to the outer lid cover 48, which is the lower surface of the lid, the projection 48a surely comes into contact with the upper surface of the heating plate 47, so that the movement of the heating plate 47 can be suppressed. Thus, the vibration of the heating plate 47 is suppressed, and the generated noise is also suppressed.
[0021]
In FIG. 4, a rubber-based vibration absorbing material 50 having elastic force is interposed between the outer lid cover 48 and the heating plate 47. Since it can be used effectively, the movement of the heating plate 47 can be further suppressed as compared with the previous plan. The rubber-based vibration absorbing material 50 is formed by being attached to one of the lower surface of the outer lid cover 48 and the upper surface of the heating plate 47 at several places.
[0022]
(Example 2)
A second embodiment will be described with reference to FIG. Since a part of the configuration is the same as that of the first embodiment, the description is partially omitted. In the drawing, reference numeral 61 denotes a heating plate, 62 denotes a pot packing, and 63 denotes an outer lid cover. The pot packing 62 of the detachable heating plate 61 extends outward or upward, and its lip piece is an outer lid lower surface. The lower cover or the outer surface of the lid cover 63 can be brought into contact with the ring in a ring shape.
[0023]
In such a configuration, the function of the lip piece of the pot packing 62 is to suppress the vertical and horizontal movements of the heating plate 61 by using the elastic force. Further, by abutting in a ring shape, the space between the lower surface of the outer lid cover 63 and the heating plate 61 is configured as a complete heat-insulating space without air convection, and the upper surface of the heating plate 61 is shut off from the outside air. It is not easily cooled, and the amount of heat generated by the heating plate 61 or the like is kept in this space area so that it can be used for the heat retaining power UP above the inner pot 66. It is possible to achieve energy saving and heat insulation effect. Further, the lip piece is also formed integrally with the pot packing 62, and can be implemented at low cost without increasing the number of parts.
[0024]
In the present invention, the outer cover on the lower surface of the outer cover has been described as the heating plate attaching / detaching portion. However, it is natural that the same effect can be obtained even when the outer cover is integrated with the outer cover.
[0025]
【The invention's effect】
As described above, according to the present invention, rattling of the heating plate is suppressed, and not only a quiet rice cooker but also a compact lid configuration can be realized, and energy saving and resource saving can be realized.
[0026]
In particular, the invention according to claim 1 is a detachable heating plate in which a main body having an inner pan, an outer lid covering the upper part of the main body, and a pot packing opposed to the inner pan flange portion are integrated on a lower surface of the outer lid. Is installed, an induction coil for induction heating the heating plate is provided in the outer lid, and a contact projection for suppressing the backlash of the heating plate for suppressing the movement of the detachable heating plate is provided on the lower surface of the detachable heating plate and the outer lid. Either way, the rattling suppression projection is always in contact with the outer lid and the detachable heating plate, so that it is possible to suppress the generation of noise, and to reduce the vibration of the heating plate. It becomes possible to suppress.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a rice cooker according to a first embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of a main part of the rice cooker. FIG. FIG. 4 is an enlarged sectional view of a main part of a rice cooker. FIG. 5 is an enlarged sectional view of a main part of a rice cooker according to a second embodiment of the present invention. FIG. 6 is a sectional view of a main part of a conventional rice cooker. Explanation of code]
Outer lid 43, 64
Inner pot 36, 66
Pot packing 53, 62
Heating plate 47, 61

Claims (1)

A body having a inner bowl, an outer lid covering the upper body, the lower surface the outer lid, set up detachable heating plate with an integrated pan gasket which faces the inner bowl flange, heating induces the heating plate An induction coil to be provided in the outer lid, and a contact protrusion for suppressing the backlash of the heating plate that suppresses the movement of the detachable heating plate is provided on one of the lower surface of the detachable heating plate and the lower surface of the outer cover, thereby suppressing the backlash. Is a rice cooker in which the projections are always in contact with the outer lid and the detachable heating plate.

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