JP3651537B2 - rice cooker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rice cooker.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a rice cooker having a lid thermistor for detecting the temperature in the pot inside the outer lid is known. In general, such a rice cooker is provided with a lid heater for heat insulation heating, and is covered and held by a lid heater cover inside the outer lid. The lid heater cover is suspended and fixed to an outer lid shaft that penetrates the outer lid. In many cases, the lid thermistor is housed in the lid heater cover. In order to prevent the temperature detection accuracy from being lowered, a structure in which the temperature detection portion of the lid thermistor is exposed in the hook is also known. In such a structure, a lid thermistor that forms a rod-shaped temperature detector is fixed by penetrating the thermistor fixing resin, and the thermistor fixing resin is fixed to the upper surface of the lid heater cover with the packing interposed therebetween. The lower end of the lid thermistor was exposed from the cylindrical inner lid shaft attached to the lid.
[0003]
[Problems to be solved by the invention]
However, the structure as described above has a problem that the number of parts increases and the manufacturing cost increases. In addition, since the outer lid shaft is provided through the outer lid, not only a configuration to prevent water from entering from the outside is required, but also the exposed portion of the outer lid shaft is painted when painting the outer surface of the outer lid. There is a problem that the manufacturing cost becomes high.
The rice cooker of this invention solves the said subject and aims at simplifying the structure which fixes components inside an outer cover.
[0004]
[Means for Solving the Problems]
The rice cooker according to claim 1 of the present invention for solving the above-mentioned problems is
A pot for storing rice and water,
An outer trunk for storing the hook,
An outer lid that covers the outer trunk;
An inner lid that covers the hook;
An inner lid holding shaft that is inserted through the central hole of the inner lid and holds the inner lid inside the outer lid;
Between the inner lid and the outer lid, a lid heater cover that holds a lid heater for heat insulation and heating,
In a rice cooker equipped with a temperature detection element for detecting the temperature in the kettle,
The lid heater cover is fixed to an outer lid shaft that is welded from the lower surface to the center portion of the outer lid,
The inner cover holding shaft is fixed to the lid heater cover, forming a through hole penetrating the center of its axial and summarized in that for fixing the temperature sensing element to the inner wall of the through hole .
[0005]
The rice cooker according to claim 2 of the present invention that solves the above problems is the rice cooker according to claim 1,
The gist of the outer lid shaft is that a ring-shaped protrusion is formed on the contact surface with the lower surface of the outer lid and is fixed to the outer lid by projection welding .
[0006]
The rice cooker according to claim 1 of the present invention having the above-described configuration includes an inner lid holding shaft that is inserted through the center hole of the inner lid and holds the inner lid inside the outer lid. A through hole is formed in the center of the inner lid holding shaft in the axial direction, and a temperature detecting element for detecting the temperature in the hook is fixed to the inner wall of the through hole. Thus, not only the inner lid is held by the inner lid holding shaft, but also the temperature detection element is fixed.
In addition, the inner lid holding shaft is fixed to a lid heater cover that holds a lid heater for heat insulation heating.
[0007]
The rice cooker according to claim 2 of the present invention having the above-described configuration forms a ring-shaped protrusion on the contact surface of the outer lid shaft with the lower surface of the outer lid, and is fixed to the outer lid by projection welding. Therefore, the outer lid shaft is not exposed on the outer surface of the outer lid.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
In order to further clarify the configuration and operation of the present invention described above, preferred embodiments of the rice cooker of the present invention will be described below.
FIG. 1 is a cross-sectional view illustrating a configuration of a lid portion of a rice cooker as an embodiment of the present invention. The lid portion of this rice cooker opens and closes the upper part of an outer trunk (not shown) that forms a side casing, and an inner lid 20 that serves as a lid for the pot 1 inside the outer lid 10 that forms the upper casing. And a lid heater 30 for heat-retaining heating and a lid thermistor 40 for detecting the temperature in the pot.
[0009]
An outer lid shaft 11 having a male screw is fixed to the center portion of the lower surface of the outer lid 10 by welding. As shown in FIG. 2, the outer lid shaft 11 has a ring-shaped projection 11a formed on the contact surface with the lower surface of the outer lid 10, and is fixed by projection welding. Therefore, the welding operation is simple and the strength is high. high. Then, a lid heater cover 31 having a packing 31 a on the outer edge and holding the lid heater 30 on the upper surface is fastened and fixed to the outer lid shaft 11 with a nut 12. Further, a resin-made inner lid shaft 21 for holding the inner lid 20 is screwed and fixed to the lid heater cover 31 with an O-ring 32 interposed therebetween. Thus, the inner lid shaft 21 is fixed to the lower surface of the outer lid 10 by the outer lid shaft 11 and the lid heater cover 31. A through hole 21 a for fixing the lid thermistor 40 is formed in the center of the inner lid shaft 21 in the axial direction. The lid thermistor 40 is inserted from above the through hole 21a of the inner lid shaft 21 via the O-ring 41, and the temperature detection portion 40a is fixed to the inner wall of the through hole 21a with the lower end of the inner lid shaft 21 exposed. Is done. The inner lid 20 is detachably held on the inner lid shaft 21. The inner lid 20 includes an inner lid rubber 20a at the inner edge of a central hole formed at the center, and engages with an outer surface step portion 21b of the inner lid shaft 21 by elastic change of the inner lid rubber 20a.
[0010]
Thus, since the outer lid shaft 11 is fixed from the lower surface of the outer lid 10, no hole is formed in the outer surface of the outer lid 10, so that it is not necessary to seal against the water dropped on the outer surface of the outer lid 10. Further, since there are no parts exposed to the outside of the outer lid 10, the outer lid 10 can be easily painted, and the manufacturing cost can be reduced. Furthermore, by fixing the lid thermistor 40 to the inner lid shaft 21 for holding the inner lid 20, it is not necessary to provide a dedicated part for fixing the position of the lid thermistor 40, so that the number of parts can be reduced. . In addition, since the temperature detection portion of the lid thermistor 40 is exposed in the hook 1 to detect the temperature in the hook, the temperature detection accuracy can be increased.
[0011]
Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can of course be implemented in various modes without departing from the gist of the present invention.
[0012]
【The invention's effect】
As described above in detail, according to the rice cooker according to claim 1 of the present invention, the position of the temperature detection element is fixed by fixing the temperature detection element to the inner lid holding shaft for holding the inner lid. For this reason, it is not necessary to provide a dedicated part for reducing the number of parts, and the manufacturing cost can be reduced. Further, the lower end of the inner lid holding shaft is exposed in the hook, and the temperature inside the hook is directly detected by fixing the temperature detecting element to a through hole that penetrates the inner lid holding shaft in the axial direction. Therefore, the accuracy of temperature detection can be increased.
In addition, the inner lid holding shaft is fixed to a lid heater cover that holds a lid heater for heat insulation heating.
[0013]
Furthermore, according to the rice cooker of Claim 2 of this invention, the structure which seals with respect to the water from an outer cover outer surface in order not to make a hole in an outer cover by the structure which does not expose an outer cover axis | shaft to an outer cover outer surface. Since it is not necessary and there are no parts exposed to the outside of the outer lid, the outer lid can be easily painted, and the manufacturing cost can be reduced.
In addition, since the outer lid shaft has a ring-shaped protrusion formed on the contact surface with the lower surface of the outer lid and is fixed to the outer lid by projection welding, the welding operation is simple and the strength is high.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of a lid portion of a rice cooker as one embodiment.
FIG. 2 is a cross-sectional view of an outer lid shaft.
[Explanation of symbols]
10 ... outer lid, 11 ... outer lid shaft, 20 ... inner lid, 21 ... inner lid shaft,
30 ... Lid heater, 31 ... Lid heater cover, 40 ... Lid thermistor.

Claims (2)

A pot for storing rice and water,
An outer trunk for storing the hook,
An outer lid that covers the outer trunk;
An inner lid that covers the hook;
An inner lid holding shaft that is inserted through the central hole of the inner lid and holds the inner lid inside the outer lid;
Between the inner lid and the outer lid, a lid heater cover that holds a lid heater for heat insulation and heating,
In a rice cooker equipped with a temperature detection element for detecting the temperature in the kettle,
The lid heater cover is fixed to an outer lid shaft that is welded from the lower surface to the center portion of the outer lid,
The inner cover holding shaft is fixed to the lid heater cover, forming a through hole penetrating the center of its axially, characterized in that fixing the temperature sensing element to the inner wall of the through hole rice cooker. The rice cooker according to claim 1 , wherein the outer lid shaft is formed with a ring-shaped protrusion on a contact surface with the lower surface of the outer lid, and is fixed to the outer lid by projection welding .

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