JP3180002B2 - Electric rice cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-efficiency electric rice cooker using a lamp heater such as a halogen lamp as a heat source.

[0002]

2. Description of the Related Art As a conventional electric rice cooker using a halogen heater, Japanese Patent Application Laid-Open No. 6-327552 discloses an electric rice cooker in which heating at the start of heating is fast, cleaning properties are improved, and heating efficiency is good. A vessel is disclosed. In this electric rice cooker, as shown in FIG. 10, an inner frame 2 in which the diameter of the lower part is larger than the inner diameter of the upper part is provided inside the main body 1,
A pan storage unit 5 for fixing an aluminum pan 4 to which a glass plate 3 closing the bottom of the inner frame 2 is fixed is provided. A heater unit 7 covered by a heater cover 6 is provided on the lower surface side of the glass plate 3. The heater unit 7 is provided in a shallow-bottom circular container-like heat insulating material 8 in an annular halogen shape corresponding to the outer peripheral portion of the pan 4. It is configured to house a heater 9, and a conical convex portion 10 is formed integrally with a central portion of the heat insulating material 8.

When the rice cooking operation is started by operating a switch or the like during rice cooking, power is supplied to the halogen heater 9 and electromagnetic waves are immediately emitted from the halogen heater 9. Then, the electromagnetic wave is transmitted directly through the glass plate 3 or reflected on the inner surface of the inner frame 2 and irradiated on the pan 4,
The pot 4 is heated to cook rice.

[0004]

However, in such an electric rice cooker, since the glass plate 3 is interposed between the halogen heater 9 and the pot 4, the halogen heater 9
Some of the emitted electromagnetic waves are absorbed by the glass plate 3,
Thermal efficiency decreases. Therefore, it has a bad influence on the taste of cooked rice. Furthermore, since the heated air around the halogen heater 9 is confined in the heater unit 7 by the glass plate 3, the temperature of the halogen heater 9 becomes high and the life is shortened. Further, since the bottom of the inner frame 2 is shielded by the glass plate 3, water, dust and the like do not enter the inside, so that the glass plate 3 has a good cleaning property.

[0005] In view of the above, an object of the present invention is to provide an electric rice cooker that efficiently irradiates a pot with electromagnetic waves radiated from a lamp heater and cooks delicious cooked rice.

[0006]

Means for solving the problems according to the present invention are, as shown in FIG. 1, an inner frame 22 located on the side of an inner hook 23.
A mounting portion 28 protruding outward is provided on the side wall of the device, and a halogen heater (lamp heater) 24 is disposed in a space 29 formed by the mounting portion 28. Further, a reflection plate 25 for reflecting electromagnetic waves radiated from the halogen heater 24 is provided below the inner pot 23.
Is that the thickness of the lower part of the side from the bottom is thicker than the thickness of the upper part of the side.

Further, as shown in FIG. 7, a protective reflector 36 for closing the space 29 when the inner pot 23 is taken out is provided on the inner frame 22 so as to be vertically movable.

[0008]

In the above-mentioned means for solving the above problems, when rice cooking is started by a switch operation or the like, an electromagnetic wave is radiated from the halogen heater 24 and radiated toward the inner pot 23 directly or reflected on the side surface of the inner frame 22. . Further, the electromagnetic waves traveling downward from the inner pot 23 are collected by the reflector 25,
Is irradiated on the bottom surface of. Further, in the inner pot 23, the heat of the lower side part generated by the irradiation of the electromagnetic wave of the halogen heater 24 is transmitted to the thick bottom and the upper part of the side face, and is efficiently and uniformly heated from the lower part of the inner pot 23 to the upper part. Done.

In this rice cooker, when the inner pot 23 is taken out, the halogen heater 24
Is located at a hidden position, the halogen heater 24 does not touch the eyes even when the inner frame 22 is viewed in a plan view, so that even if foreign matter such as dust or water falls through the opening of the inner frame 22, it enters the mounting portion 28. Hateful.

[0010] As shown in FIG. 7, by providing the protective reflector 36, when the inner pot 23 is not mounted, the protective reflector 36 rises and is located above the mounting portion 28 to close the space 29. Therefore, the halogen heater 24 is not exposed. Therefore, the mounting portion 2 for foreign matter such as dust or water is surely provided.
8 can be prevented. When the inner pot 23 is mounted, the protective reflection plate 36 is located at a predetermined position below the mounting section 28, and the halogen heater 24 is exposed, so that rice can be cooked.

[0011]

【Example】

(First Embodiment) As shown in FIG. 1, an electric rice cooker according to a first embodiment of the present invention includes a rice cooker main body 20 and a lid 21 that can be opened and closed to cover an upper opening of the rice cooker main body 20. Has an inner frame 22 and an inner pot 23 stored in the inner frame 22.
And a halogen heater 2 which is a lamp heater as a heat source
4 and a reflector 25 for reflecting electromagnetic waves radiated from the halogen heater 24. The halogen heater 24 is arranged on the side of the inner pot 22. Although not shown, an operation unit, a control unit, and the like provided with a start / stop switch and the like are provided.

The halogen heater 24 generates electromagnetic waves from visible light to far-infrared light, and is excellent in quick heat and cool properties. As shown in FIG. 2, the halogen heater 24 is formed in a partially annular shape. I have. Note that this halogen heater 24 is the same as that shown in FIG.
, Four bar-shaped halogen lamps 26 are combined,
It is also conceivable to arrange the inner pot 23 on all sides.

The inner frame 22 is a bottomed container made of aluminum or the like. The inner surface of the inner frame 22 has a mirror gloss with high reflection efficiency for reflecting the electromagnetic wave of the halogen heater 24. And the upper edge is attached to the support piece 27 protruding from the rice cooker main body 20. On the side wall, a mounting portion 28 protruding in an arc shape outward is formed in the circumferential direction, and the halogen heater 24 is disposed in a space 29 formed by the mounting portion 28 via a support member. I have. The halogen heater 24 is provided in the inner pot 23 in consideration of thermal efficiency.
Is provided at a height of 50 mm or less above the bottom surface of.

That is, water and 1800 g of rice are put into an inner pot 23 having an inner diameter of 23 cm, and four rod-shaped halogen lamps 26 having a total power consumption of 1000 W are separated from the inner pot 23 by 15 mm as shown in FIG. And heats the inner pot 23. At this time, the height of the bottom surface of the inner pot 23 housed in the inner frame 22 was set as a reference (0 mm), and the halogen heater 24 was moved upward from the reference position, and the movement distance and thermal efficiency were examined. As shown in Fig. 4, the distance is 50m
m, the thermal efficiency is extremely reduced and the halogen heater 2
It can be understood that a high thermal efficiency of 75 to 80% can be obtained by setting the length 4 to 50 mm or less above the bottom surface of the inner pot 23.

The inner pot 23 is made of a metal having high thermal conductivity, heat resistance and impact resistance such as aluminum or aluminum alloy as a base material, and its inner surface is coated with a fluorine-based resin. In addition, the bottom of the side wall is formed to be thicker than the thickness of the upper side surface from the bottom surface in the shape of a bottomed cylinder, so that the heat received on the side surface by the electromagnetic wave irradiation of the halogen heater 24 is easily transmitted to the bottom surface. ing. Further, the inner pot 23 is provided with handles 30 at two opposing upper peripheral edges, and the inner pot 23 is supported by the handle 30 engaging with the upper edge of the inner frame 22.

The reflecting plate 25 is made of a heat-resistant and tarnish-resistant stainless steel plate or a material having a high reflectance to electromagnetic waves, such as bright aluminum, and has an arc-shaped dish-like shape enclosing the bottom surface of the inner pot 23. Is formed. Then, below the inner hook 23, it is fixed to the bottom surface of the inner frame via a support member. A cylindrical projection 31 penetrating in the vertical direction is fitted to the center of the reflection plate 25, and the projection 31 projects from the bottom surface of the inner frame 22. In the figure, reference numeral 32 denotes a temperature detection sensor which is inserted through the protruding body 31 and contacts the bottom surface of the inner pot 23 when the inner pot 23 is attached to detect the rice cooking temperature. In addition, as shown in FIG. 5, the shape of the reflector may be a parabolic reflector 33 surrounding the bottom surface of the inner pot 23.

The lid 21 includes an outer lid 21a and an inner lid 21b.
The outer lid 21a is formed in a hollow shape, and an inner lid 21b that covers the upper opening of the inner pot 23 so as to be freely opened and closed is attached to the lower surface so as to move slightly. Also, the inner lid 21b
A packing for sealing a gap with an upper portion of the inner pot 23 is attached to an inner peripheral edge of the inner pot 23.

As shown in FIG. 6, a space 34 is formed in the inner frame 22 so that the inner diameter of the upper portion of the side wall is smaller than the inner diameter of the lower portion.
It is also conceivable to arrange a reflecting plate 35 surrounding the bottom of the halogen heater 24 and the inner pot 23.

In the above arrangement, when the rice cooker main body 20 with the washed rice and an appropriate amount of water charged therein is mounted on the rice cooker main body 20 and the rice cooker operation switch is turned on, rice cooking is started, and power is supplied to the halogen heater 24. You. Then, the halogen heater 24 immediately emits an electromagnetic wave, and the electromagnetic wave is transmitted to the inner pot 23.
The rice is heated by being irradiated to the rice. At this time,
The electromagnetic wave is irradiated directly or on the side surface of the inner pot 23 after being reflected on the wall surface of the mounting portion 28 of the inner frame 22.
The electromagnetic wave directed downward from 3 is condensed by the reflection plate 25 and is irradiated on the bottom surface of the inner pot 23. Further, in the inner pot 23, the heat capacity from the thick bottom to the lower side is increased,
Heat is efficiently transmitted from the lower part to the upper part of the inner pot 23, and rice is cooked uniformly and evenly. Then, the rice cooking temperature is detected by the temperature detection sensor 32, and the cooked rice is heated at the ideal rice cooking temperature.

When the lid 21 is opened and the inner pot 23 is taken out, the halogen heater 24 is located at a position hidden from the opening of the inner frame 22. Never touch your eyes. Therefore, even if foreign matter such as dust or water falls from the opening of the inner frame 22, it is difficult for the foreign matter to enter the mounting portion 28, and most of the foreign matter can be prevented from falling on the reflection plate 25 and directly adhering to the halogen heater 24. Therefore, the thermal efficiency of the halogen heater 24 does not decrease. Further, at the time of cleaning, it is only necessary to clean the upper part of the reflection plate 25, and the cleaning property is very good.

Further, since the glass plate is not provided unlike the conventional electric rice cooker, the inner pot 23 can be directly heated, the thermal efficiency can be improved, and there is a possibility of damage due to the falling of the object onto the glass plate. Is also gone. Further, since the halogen heater 24 is not sealed in a narrow space, it does not reach a high temperature and its life is not shortened. Further, by disposing the reflection plate 25 on the bottom surface of the inner pot 23, it is possible to collect the electromagnetic wave leaking to the lower part of the inner pot 23 and irradiate the bottom surface of the inner pot 23 with the heat efficiency. It can save energy and cook delicious rice.

Further, since the thickness of the lower part of the side surface from the bottom surface of the inner pot 23 is larger than the thickness of the upper part of the side surface, the heat capacity of the bottom surface is increased and uniform heating can be performed from the bottom surface. Therefore, even if the halogen heater is at the lower part of the side surface, there is no temperature unevenness.

(Second Embodiment) In this embodiment, as shown in FIG. 7, a space formed by a mounting portion 28 of a halogen heater 24 below an inner pot 23 housed in an inner frame 22 of the rice cooker main body 20. A protective reflection plate 36 is provided as a protection plate that closes 29. The protective reflector 36 has the same material and shape as the reflector 25 of the first embodiment, and also has a function as a reflector. Further, the protective reflection plate 36 is supported by a compression spring 37 provided on the bottom surface of the inner frame 22, and can be moved up and down by the elasticity of the compression spring 37. A cylindrical projection 38 penetrating in the vertical direction is fitted to the center of the protective reflection plate 36,
The temperature detection sensor 32 is inserted into the upper part of the protruding body 38, and the space 29
The length of the lower part of the protruding body 38 is set so that the opening is opened. The shape of the protective reflector may be a parabolic protective reflector 39 surrounding the bottom of the inner pot as shown in FIG. Other configurations and operations are the same as those of the first embodiment, and members having the same functions are denoted by the same reference numerals.

When the inner pot 23 is not mounted on the rice cooker main body 20, as shown in FIG. 9, the protective reflection plate 36 is raised by the upward biasing force of the compression spring 37 and rises above the mounting portion 28. And the halogen heater 24 is not exposed. When the inner pot 23 is attached to the rice cooker main body 20, the bottom surface of the inner pot 23 comes into contact with the temperature detection sensor 32 inserted into the protruding body 38, and the protective reflection plate 36.
Is pushed down, and the protruding body 38 comes into contact with the bottom surface of the inner frame 22, the protective reflection plate 36 stops to a predetermined position below the mounting portion 28, and the halogen heater 24 is exposed. The rice cooking operation is the same as in the first embodiment.

As described above, in this embodiment, when the inner pot 23 is not inserted into the electric rice cooker, the protective reflector 36 covers the space 29 of the mounting portion 28 of the halogen heater 24, so that dust and Intrusion of water or the like can be reliably prevented, the performance of the halogen heater 24 does not decrease, and the cleanability and design are further improved.

It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that many modifications and changes can be made to the above-described embodiment within the scope of the present invention. For example, in the second embodiment, since the temperature detection sensor also moves up and down with the up and down movement of the protective reflector, it is difficult to wire the lead wires of the temperature detection sensor. In order to solve this, the temperature detection sensor is fixed directly to the inner frame by using a mounting member, etc., and the protrusion that penetrates the protective reflection plate is fitted to the temperature detection sensor so that the outer surface of the temperature detection sensor is The inner surface may be configured to slide vertically. At this time,
In order to prevent the protective reflector from moving too far upward and the projecting body from falling out of the temperature detection sensor, even if a guide member is provided to restrict horizontal displacement due to the vertical movement of the protective reflector. Good.

[0027]

As is clear from the above description, according to the present invention, since the halogen heater is disposed in a space protruding outward from the side wall of the inner frame, dust, water and the like to the halogen heater can be obtained with a simple structure. Foreign matter can be prevented from entering. Further, it is possible to prevent the halogen heater from being damaged due to the falling object. Furthermore, since the inner pot is directly heated, the heat of the halogen heater can be effectively used, the thermal efficiency is improved, and the rice can be cooked evenly. In addition, since the halogen heater is not hermetically sealed in a narrow space, heat is not stored and the temperature does not become high, so that the life of the halogen heater can be extended.

Further, by disposing a reflection plate below the inner pot,
Electromagnetic waves leaking below the inner pot can be collected and radiated to the bottom of the inner pot, so that thermal efficiency can be further improved. Furthermore, since the thickness of the lower part of the side from the bottom of the inner pot is made thicker than the thickness of the upper part of the side, the heat applied to the side of the inner pot is easily transmitted to the bottom of the inner pot, and the heat capacity of the bottom increases, Uniform heating of the entire pot is possible.

When a protective plate for closing a space for housing a halogen heater when the inner pot is taken out is provided,
Intrusion of foreign matter can be more reliably prevented, and cleanability is further improved. Further, no foreign matter adheres to the halogen heater, and the performance of the halogen heater does not decrease.

[Brief description of the drawings]

FIG. 1 shows an electric rice cooker according to a first embodiment.

FIG. 2 is a diagram showing an arrangement of a halogen heater.

FIG. 3 is a diagram showing an arrangement of another halogen heater.

FIG. 4 is a diagram showing a change in thermal efficiency with respect to a distance of a halogen heater from a bottom of an inner pot.

FIG. 5 is a diagram showing an electric rice cooker provided with a reflector of another shape.

FIG. 6 is a view showing an electric rice cooker provided with an inner frame of another shape.

FIG. 7 shows an electric rice cooker according to a second embodiment.

FIG. 8 is a view showing an electric rice cooker provided with a protective reflection plate of another shape.

FIG. 9 is a view showing the electric rice cooker when the inner pot is removed.

FIG. 10 shows a conventional electric rice cooker.

[Explanation of symbols]

 22 Inner frame 23 Inner pot 24 Halogen heater 25 Reflector 28 Mounting part 29 Space 36 Protective reflector 37 Compression spring

Claims (2)

(57) [Claims] 1. An electric rice cooker having an inner pot built in an inner frame, and a lamp heater for heating the inner pot, wherein the lamp heater is disposed at a side of the inner pot. A lamp heater is provided in the inner frame to provide a space for preventing foreign substances such as dust and water from entering the lamp heater .
Empty space for installing the lamp heater when removing the kettle
An electric rice cooker comprising a protective plate for closing the gap . 2. The thickness from the bottom to the lower side of the inner pot is
2. The structure according to claim 1, wherein the thickness of the upper surface is larger than that of the upper surface.
An electric rice cooker as described.