JPH07313346A - Rice cooker - Google Patents

Abstract

PURPOSE:To suppress the generation of an unevenness in heating due to the split structure while improving the assembling property by constituting an internal frame of a split structure, and prevent a cylindrical part of the internal frame from being damaged. CONSTITUTION:An internal frame 5 in a rice cooker main body 1 is constituted of a half-split structure of a cylindrical part 6 and bottom plate part 7. Then, on the upper surface of the bottom plate part 7, a rice cooking heater 17 is provided, and a pot 30 is put in the internal frame 5. Then, the pot 30 is heated by a radiational heat of the rice cooking heater 17. For such a rice cooker, the cylindrical part 6 of the internal frame 5 is formed of an aluminum material, and an alumite process is applied on the internal surface of the cylindrical part 6, and the bottom plate part 7 of the internal frame 5 is formed of an aluminum material. Then, the surface of the upper side of the bottom plate part 7 is made as a heat-reflective surface 7a while keeping it as the base metal of aluminum without applying the alumite process, and the pot 30 is formed of an aluminum material. On the external surface of the pot 30, the alumite process is applied, and a gap between the side surface of the pot 30 and the internal surface of the cylindrical part 6 is made as very small interval L1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice cooker that cooks rice by heating a pan with a rice cooking heater.

[0002]

2. Description of the Related Art Generally, a rice cooker is provided with a bottomed cylindrical inner frame in its main body, and a rice cooking heater is provided at the inner bottom portion of the inner frame. Then, a pan is inserted into the inner frame from the opening at the upper end of the inner frame, and this pan is heated by the rice cooking heater to cook rice.

The inner frame is usually constructed as a bottomed tubular unitary structure. However, if the inner frame is a bottomed tubular unitary body, it is troublesome to incorporate the rice cooking heater into the inner bottom portion, and there is a problem that the assemblability of the rice cooker deteriorates.

Therefore, as disclosed in Japanese Utility Model Laid-Open No. 55-50631, the inner frame is divided into a cylindrical portion and a bottom plate portion, and a rice cooking heater is disposed on the bottom plate portion. In this state, it has been proposed to fit a cylindrical portion around the periphery of the bottom plate portion to form an inner frame.

In this rice cooker, the radiant heat of the rice cooking heater is reflected by the bottom plate portion when the rice is cooked to heat the bottom of the pan, and the heat of the rice cooking heater is conducted from the bottom plate portion to the tubular portion to form the tubular portion. The temperature becomes high, and the radiant heat of this tubular portion heats the peripheral surface of the pot, and rice is cooked by such heating.

[0006]

However, if the inner frame has a structure in which it is divided into a tubular portion and a bottom plate portion, the heat conduction from the bottom plate portion to the tubular portion is not possible due to the divided structure. As a result, the radiation from the inner surface of the tubular part to the side surface of the pan decreases, the side temperature of the pan does not rise sufficiently during rice cooking, the heating efficiency of the entire pan deteriorates, and uneven cooking Cooking unevenness is likely to occur.

Therefore, the side surface of the pot is brought close to the inner surface of the tubular portion of the inner frame, and the gap between the side surface of the pot and the inner surface of the tubular portion of the inner frame is set to be a very small gap. It is conceivable to configure so as to compensate for insufficient heating.

However, the pot is generally made of an aluminum material, and the outer surface of the pot is anodized so as to enhance heat absorption efficiency. The alumite film formed by this treatment is fairly hard, so if the gap between the side surface of the pan and the inner surface of the tubular portion of the inner frame is very small, the pan of There is a problem that the outer surface comes into contact with the tubular portion of the inner frame, and the inner surface of the tubular portion is rubbed by the hard alumite layer due to this contact, resulting in scratches.

The present invention has been made by paying attention to such a point. An object of the present invention is to construct an inner frame in a divided structure to improve the assemblability and to improve heating unevenness caused by the divided structure. An object of the present invention is to provide a rice cooker capable of suppressing the occurrence of the above and preventing the tubular portion of the inner frame thereof from being scratched.

[0010]

In order to achieve such an object, the present invention provides a bottomed tubular inner frame in a rice cooker body, the inner frame being a tubular portion, and the tubular portion. It has a split structure with a bottom plate that detachably fits into the opening at the lower end of the bottom plate to close the opening, a rice cooking heater is provided on the upper surface of the bottom plate, and a pan is stored in the inner frame. In a rice cooker that supports the pot in a state of being separated from the tubular portion and the rice cooking heater and heats the pot with radiant heat of the rice cooking heater to cook rice, the tubular portion of the inner frame is formed of an aluminum material. Then
The inner surface of this tubular portion is anodized, the bottom plate of the inner frame is made of an aluminum material, and the upper surface of the bottom plate is a heat-reflecting surface of the aluminum material that has not been anodized. The pot is made of an aluminum material, the outer surface of the pot is anodized, and the gap between the side surface of the pot and the inner surface of the tubular portion is a very small gap.

[0011]

[Function] During rice cooking, the rice cooking heater is energized, and the rice cooking heater heats the pan. Here, the surface of the bottom plate portion of the inner frame is a heat reflection portion of the aluminum material that is not anodized and has good heat reflection, and therefore the radiant heat of the rice cooking heater is the surface of this bottom plate portion. Efficiently reflects at the heat reflection part of and hits the pot. And since the outer surface of the pan is anodized, which has excellent heat absorption,
The pot efficiently absorbs the heat, which causes the pot to be sufficiently heated.

The tubular portion of the inner frame is heated by heat conduction from the bottom plate portion, and the side surface of the pot is heated by the radiant heat from the tubular portion. Since the tubular portion and the bottom plate portion are configured in a divided structure, heat conduction from the bottom plate portion to the tubular portion is lower than that in the case where the both are integrated, and the temperature of the tubular portion is reduced. The rise is suppressed a little.

However, since the side surface of the pot is arranged close to the inner surface of the tubular portion, the side surface of the pot is sufficiently heated even if the temperature of the tubular portion does not rise to such a high temperature.
As a result, the entire pot is efficiently heated in combination with the heating by the rice cooking heater, and uneven cooking is prevented.

Since the side surface of the pot is arranged close to the inner surface of the tubular portion, when the pot is put in and taken out from the inner frame, the lower end portion and side surface of the pot come into contact with the inner surface of the tubular portion and rub against each other. May be However, the inner surface of the tubular part is subjected to alumite treatment of the same quality as the alumite treatment applied to the outer surface of the pot, that is, a coating layer of the same hardness is provided on the outer surface of the pot and the inner surface of the tubular part. Therefore, even if the pot contacts the inner surface of the tubular portion, the inner surface is not scratched and the outer surface of the pot is not scratched.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 is a rice cooker main body, and the main body 1 is composed of a tubular case 2 and a bottom lid 4 attached to an opening at the lower end of the tubular case 2 via screws 3.

An inner frame 5 is provided inside the rice cooker main body 1, and the inner frame 5 has a two-part structure composed of a tubular portion 6 and a bottom plate portion 7. An opening at the upper end of the tubular portion 6 is provided. A flange 8 is integrally formed at the edge so as to be bent on the outer peripheral side thereof.

A frame 10 is attached to the opening edge at the upper end of the tubular case 2, and the tubular portion 6 of the inner frame 5 is inserted into the rice cooker body 1 through the inside of the frame 10. The flange 8 of the tubular portion 6 is the frame 1
The tubular case 6 of the rice cooker body 1 is locked to
It is fixed to.

An opening 11 is formed at the lower end of the tubular portion 6, and a fitting opening 12 is formed on the periphery of the opening 11 so as to expand downward in a tapered shape. The tubular portion 6 is also provided.
A cord-shaped side heater 13 is attached to the outer periphery of the.

The bottom plate portion 7 of the inner frame 5 is horizontally attached to the upper surface portion of the bottom lid 4 via a support plate 15. Then, a rice cooking heater 17 composed of an annular sheathed heater is attached on the bottom plate portion 7 via a heat resistant insulating member 16 such as an insulator.

At the central portion of the bottom plate portion 7, there is a convex portion 1 having a truncated cone shape.
8 is integrally formed to project, an opening 19 is formed in the upper surface of the convex portion 18, and a temperature sensor 20 is provided inside the opening 19. The temperature sensor 20 includes a spring 21
Is elastically urged so as to project upward from the opening 19. The temperature sensor 20 is provided with an interlocking lever 22, and a pan switch 23 interlocking with the vertical movement of the interlocking lever 22 is provided below the bottom plate portion 7.

The bottom plate portion 7 is formed to have a size corresponding to the fitting opening portion 12 of the cylindrical portion 6, and the peripheral portion of the bottom plate portion 7 has an inclined portion which tapers downwardly. 25 are integrally formed. Then, the fitting opening portion 12 of the tubular portion 6 is fitted and closely adhered to the inclined portion 25 on the outer periphery of the bottom plate portion 7, and the bottom plate portion 7 closes the opening 11 at the lower end of the tubular portion 6, whereby An inner frame 5 having a bottom cylindrical shape is configured.

When assembling the rice cooker, first, the bottom plate portion 7 is attached on the bottom lid 4, the rice cooking heater 17 is attached on the bottom plate portion 7, and the tubular portion 6 is attached to the tubular case 2. When the rice cooking heater 17 is mounted on the bottom plate portion 7, since the bottom plate portion 7 is in a flat state, the mounting can be performed easily and efficiently.

Then, the cylindrical case 2 is placed on the bottom cover 4, and the bottom cover 4 and the cylindrical case 2 are connected to each other with screws 3. When the tubular case 2 is overlaid on the bottom cover 4, the inclined portion 25 on the outer periphery of the bottom plate portion 7 is fitted into the fitting opening portion 12 of the tubular portion 6, whereby the tubular inner frame 5 with a bottom is formed. Composed.

A pot 30 is removably housed inside the inner frame 5. A step portion 31 is formed on the upper portion of the pot 30 so as to project to the outer peripheral side thereof. It is supported in a suspended state.

When the pot 30 is inserted into the inner frame 5, the pot 3
The outer bottom surface of 0 pushes the temperature sensor 20 downward against the spring 21. And this temperature sensor 20
The upper end surface of the pot adheres to the central portion of the outer bottom surface of the pot 30 by the urging force of the spring 21.

When the temperature sensor 20 is pushed down by the pan 30 and moves downward, this operation is performed by the interlocking lever 22.
It is transmitted to the pan switch 23 via
The contact of is closed and the arrangement of the pot 30 with respect to the inside of the inner frame 5 is detected.

A lid 32 is pivotally attached to the upper surface of the rice cooker body 1 through a hinge pin 33 so as to be vertically rotatable, and an inner lid 34 is attached to the inner surface of the lid 32. The opening at the upper end of the pan 30 is closed with.

The tubular portion 6 of the inner frame 5 is made of an aluminum material having a thickness of about 0.7 mm, and the inner surface of the tubular portion 6 is anodized to a film thickness of 0.5 to 4.0 μm. The bottom plate portion 7 of the inner frame 5 is made of an aluminum material having a thickness of about 0.5 mm, and the surface of the bottom plate portion 7 on the upper surface side is a reflection surface 7a which is a non-anodized aluminum material. There is.

The pot 30 is made of an aluminum material having good heat conductivity, and the outer surface of the pot 30 is anodized to have a film thickness of 3 to 10 μm in order to absorb radiation heat from the rice cooking heater 17 well. .

The gap L1 between the side surface of the pot 30 and the inner surface of the tubular portion 6 is a minute gap of 0.5 to 1.5 mm, and the gap L2 between the outer bottom surface of the pot 30 and the rice heating heater 17. Is 2 to 5 mm.

Reference numeral 35 is a control circuit section for controlling the energization of the rice cooking heater 17 and the side heater 13. When rice is cooked, a predetermined amount of washed water and water are stored in the pot 30, and a rice cooker switch (not shown) is turned on by a timer or manual operation. According to the turning on of the rice cooking switch, the power supply to the rice cooking heater 17 and the side heater 13 is controlled via the control circuit unit 35, and the pan 30 is heated by the rice cooking heater 17 and the side heater 13 to cook rice.

Here, the surface of the bottom plate portion 7 of the inner frame 5 is a heat reflecting portion 7a which is an aluminum material which is not anodized and has a good heat reflecting property. The radiant heat is efficiently reflected by the heat reflecting portion 7a on the surface of the bottom plate portion 7 and enters the pot 30. Then, the outer surface of the pot 30 is subjected to an alumite treatment which is excellent in heat absorption, so that the pot 30 efficiently absorbs the heat, whereby the pot 30 is sufficiently heated.

The tubular portion 6 of the inner frame 5 is heated by heat conduction from the bottom plate portion 7, and the side surface of the pot 30 is heated by the radiant heat of the heated tubular portion 6. However, since the tubular portion 6 and the bottom plate portion 7 are divided, heat conduction from the bottom plate portion 7 to the tubular portion 6 is lower than that in the case where the both are integrated, and the tubular portion 6 is thus separated. The rise in temperature is slightly suppressed.

However, since the side surface of the pot 30 is arranged close to the inner surface of the tubular portion 6, the side surface of the pot 30 is sufficiently heated even if the temperature of the tubular portion 6 does not rise so much. Thus, in combination with the heating by the rice cooking heater 17, the entire pan 30 is efficiently heated, and uneven cooking is prevented.

Further, a side heater 13 is attached to the tubular portion 6, so that the side heater 13 compensates for the decrease in heat conduction from the bottom plate portion 7 to the tubular portion 6, and further heats the pot 30. Efficiency is improved and uneven cooking is more reliably prevented.

After the rice is cooked, the rice heater 17 is de-energized, and the cooked rice in the pan 30 is kept warm by the side heaters 13. However, a gap between the inner surface of the tubular portion 6 and the side surface of the pan 30 is created. Since the amount of heat is very small, the heat of the side heater 13 is effectively transmitted to the pan 30, and good heat retention can be obtained.

Since the side surface of the pot 30 is arranged close to the inner surface of the tubular portion 6, when the pot 30 is taken in and out of the inner frame 5, the lower end portion and the side surface of the pot 30 have the tubular portion 6. May come in contact with the inner surface and be rubbed.

However, on the inner surface of the tubular portion 6, the pot 3
0 is subjected to the same alumite treatment as that applied to the outer surface, that is, the outer surface of the pot 30 and the inner surface of the tubular portion 6 are provided with a coating layer having the same hardness, and thus the pot 30 is Even if the inner surface of the tubular portion 6 is contacted, the inner surface is not scratched, and the outer surface of the pot 30 is not scratched.

Since the bottom plate portion 7 of the inner frame 6 effectively reflects heat on its surface, there is an advantage that the temperature rise of parts such as the pan switch 23 arranged below the bottom plate portion 7 can be suppressed. .

Further, the bottom plate portion 7 has a pot 30 and a tubular portion 6.
Is applied to the bottom plate portion 7, and therefore, the plate thickness of the bottom plate portion 7 can be reduced, and the bottom plate portion 7 does not need to be subjected to alumite treatment. Therefore, the cost of the bottom plate portion 7 can be reduced. It has the advantage of being cheap and economically advantageous.

[0041]

As described above, according to the present invention,
While the inner frame is configured in a divided structure to improve the assemblability, there are advantages that it is possible to suppress the occurrence of heating unevenness due to the divided structure and prevent the tubular portion of the inner frame from being scratched. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a rice cooker according to an embodiment of the present invention.

[Explanation of symbols]

 1 ... Rice cooker main body 5 ... Inner frame 6 ... Cylindrical part 7 ... Bottom plate part 17 ... Rice cooker heater 30 ... Pot

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hirotaka Sarashina 2570 1 Gosuda, Kamo City, Niigata Prefecture 1570 Toshiba Home Techno Co., Ltd. (72) Hiroyuki Takeishi 2570 1 Gosuda, Kamo City, Niigata Prefecture Toshiba Home Inside Techno Co., Ltd. (72) Inventor Toshiyuki Takahashi 2570-1 Gosuda, Kamo City, Niigata Prefecture Toshiba Home Techno Co., Ltd.

Claims (2)

[Claims] 1. A bottomed tubular inner frame is provided in the rice cooker body, and the inner frame is detachably fitted into a tubular portion and an opening at a lower end of the tubular portion, and the opening is formed. It has a divided structure with a closed bottom plate part, a rice cooking heater is provided on the upper surface part of the bottom plate part, a pan is stored in the inner frame, and the pan is supported in a state of being separated from the tubular part and the rice cooking heater. Then, in the rice cooker that cooks rice by heating the pot with the radiant heat of the rice cooking heater, the tubular portion of the inner frame is formed of an aluminum material, and the inner surface of the tubular portion is anodized to form an inner frame. The bottom plate part of is formed of an aluminum material, the surface of the upper surface side of this bottom plate part is a heat-reflecting surface of the aluminum dough that is not anodized, and the pot is formed of an aluminum material.
The rice cooker is characterized in that the outer surface of the pot is anodized, and the gap between the side surface of the pot and the inner surface of the tubular portion is set to a very small interval. 2. The rice cooker according to claim 1, wherein the gap between the side surface of the pot and the inner surface of the tubular portion of the inner frame is 0.5 to 1.5 mm.