JP2000060723A - Induction heating type rice cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and inexpensively suppress the consumption power, and improve the heat insulation performance by forming a protective frame in a double structure having an air heat insulating layer inside, in a rice cooker wherein an internal pot housed in an internal container is induction-heated by an induction heating coil held by the protective frame which forms the lower part of the internal container. SOLUTION: In a container main body 1, the internal container 4 comprising a protective frame 2 and an internal drum 3, is set, and also, in the internal container 4, the internal pot 5 is housed and closed with a lid body 6. In this case, the protective frame 2 is formed of an upper frame 7 and a lower frame 8, and an air heat insulating layer 9 is arranged in the tray-shaped internal space. When power is supplied to an induction heating coil 11, the internal pot 5 is induction-heated, and a rice cooking is started. Also, when the rice cooking is completed, by turning on a heater 12, the internal pot 5 is kept warm through the internal drum 3. The radiant heat generated from the internal pot 5, is shut off by the air heat insulating layer 9 on the bottom surface side, and shut off by a heat insulating cylindrical part 15 on the side surface side. Therefore, the heat insulation performance of the internal pot 5 is improved, and the consumption power of the rice cooker can be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating type rice cooker, and more particularly to an induction heating type rice cooker characterized by its heat insulating structure.

[0002]

2. Description of the Related Art Conventionally, in an induction heating type rice cooker, as shown in FIG.
An inner container 103 composed of 2 is provided, and an inner pot 104 is arranged in the inner container 103 so that the inner pot 104 can be taken out and is closed by a lid 105. An induction heating coil 106 is arranged on the lower surface of the protective frame 101 so that the inner pot 104 can be induction-heated. However, no measures have been taken to improve the heat retention of the inner pot.

On the other hand, in the electric rice cooker, for example, Japanese Utility Model Publication No. 7-48184, Japanese Utility Model Publication No. 7-52661,
As shown in Utility Model Registration No. 2503610,
The inner pot is directly heated by a heating plate equipped with a heater. The inner container has a vacuum double structure to improve the heat retention of the inner pot.

[0004]

However, in the induction heating type rice cooker, the heat is transferred to the outside of the container body 100 by the radiant heat from the inner pan 104 which is induction-heated. In particular, at the bottom of the container body 100, the heat from the inner pan 104 is further promoted because the structure is such that the wind from the fan provided for cooling various electronic components makes it easy to waste heat to the outside. As a result, power consumption is increasing.

On the other hand, in the electric rice cooker, since the entire inner container has the vacuum double structure, the processing cost thereof is high.

Further, since the inner container of this electric rice cooker is made of a metal material so as to have a vacuum double structure, even if this vacuum double structure is applied to the induction heating rice cooker as it is, There is a problem that the inner container is induction-heated by the induction heating coil.

[0007] Therefore, an object of the present invention is to provide a heat insulating structure for a rice cooker which has a simple structure and can be manufactured at low cost and which can suppress power consumption and is excellent in heat retention.

[0008]

Means for Solving the Problems As a means for solving the above problems, the present invention forms an inner container consisting of an inner shell and a protective frame in a container body, and makes it possible to take out an inner pot from the inner container. In an induction heating type rice cooker in which the inner pot is induction-heated by an induction heating coil arranged in a lower part of the inner container and held in a protection frame, the protection frame is a double layer having an air insulating layer inside. It is structured.

With this structure, even if radiant heat is generated from the inner pot by energizing the induction heating coil, this radiant heat is blocked by the air heat insulating layer formed on the protective frame, and is less likely to be radiated to the outside of the container body.

In this case, if the inner body is made of a cylindrical metal plate, it can be formed at low cost.

Further, it is preferable that a heater capable of controlling electric power is provided on the outer peripheral surface of the inner case in addition to the induction heating coil, since the deterioration of heat retention due to the metal plate can be eliminated.

It is preferable that the protective frame is composed of two parts, an upper frame and a lower frame, because it is easy to manufacture.

In this case, the reinforcing portion may be formed on at least one of the lower surface of the upper frame and the upper surface of the lower frame. This reinforcing part can be configured with ribs and protrusions,
It not only reinforces the protective frame, but also serves to secure the air heat insulating layer.

It is preferable to form the heat reflecting portion on the surface of at least one of the upper frame and the lower frame on which the air heat insulating layer is formed, because the heat insulating property can be further enhanced.

Further, it is preferable to provide a heat insulating cylindrical portion having a heat insulating space therein on the outer peripheral side of the inner case, since the heat insulating property can be further enhanced.

In this case, it is preferable that the heat insulating cylindrical portion has a vacuum double structure.

A heat insulating member may be arranged on the outer circumference of the upper portion of the heat insulating cylindrical portion.

Further, when the lower part of the heat insulating cylindrical portion of the vacuum double structure is extended to the side of the induction heating coil and the magnetic shield is arranged between the heat insulating cylindrical portion and the induction heating coil, the induction heating It is possible to improve heat insulation without causing a problem.

[0019]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a rice cooker according to this embodiment.
In this rice cooker, an inner container 4 including a protective frame 2 and an inner case 3 is provided in a container body 1. Inner pot 5 in inner container 4
Is arranged so that it can be taken out, and is closed by the lid 6.

The protective frame 2 is formed by combining an upper frame 7 and a lower frame 8. Both the upper frame 7 and the lower frame 8 are formed by processing PET (polyethylene terephthalate). In a state where the upper frame 7 and the lower frame 8 are combined, the upper frame 7 and the lower frame 8 have a substantially dish shape, and the air heat insulating layer 9 is formed inside. A rib (not shown) serving as a reinforcing portion is formed on the lower surface of the upper frame 7 or the upper surface of the lower frame 8. In the combined state, the rib abuts the upper surface of the lower frame 8 or the lower surface of the upper frame 7 (may be non-contact), and the air heat insulating layer 9 can be reliably formed (non-contact). In this case, the air insulating layer 9 is maintained even if the upper frame 7 or the lower frame 8 is deformed. Since the rib also plays a role of increasing the strength of the protective frame 2, it is possible to reduce the thickness of the upper frame 7 and the lower frame 8. As a result, the air insulation layer 9 can provide the protective frame 2 having the same thickness as the conventional one, which has high heat insulation performance. Further, on the lower surface of the upper frame 7 or the upper surface of the lower frame 8, a heat reflection layer 10 made of silicon resin paint containing mica is formed by coating, vapor deposition or the like. The heat reflection layer 10 is provided to prevent radiant heat from the heated inner pot 5 from leaking to the outside. As described above, since the protective frame 2 is configured by the two members including the upper frame 7 and the lower frame 8, the air heat insulating layer 9 and the heat reflecting layer 10 can be easily formed.

On the lower surface of the lower frame 8, there are arranged induction heating coils 11 which are wound at two locations inside and outside. A high-frequency current is supplied to the induction heating coil 11 from a high-frequency generation circuit (not shown) so that the inner pot 5 can be induction-heated. Further, a plurality of ferrites (not shown) are radially arranged on the lower surface of the lower frame 8. And
The induction heating coil 11 also has a lower frame 8 by a ferrite holding portion (not shown) for holding these ferrites.
It is designed to be held at.

The inner case 3 is formed by forming a stainless thin plate into a cylindrical shape and disposing the heater 12 on the outer peripheral surface thereof. The lower open end of the inner case 3 is in contact with the open edge 8a of the protective frame 2, and the upper open end is in contact with the shoulder body 13 of the container body 1. The shoulder body 13 can support the opening flange portion of the inner pot 5. The heater 12 is controlled to be energized separately from the induction heating coil 11.

A heat insulating cylindrical portion 15 having a vacuum double structure is disposed on the outer peripheral side of the inner case 3. The upper open end of the heat insulating cylindrical portion 15 is in contact with the shoulder body 13 like the inner case 3. A heat insulating member 16 made of urethane or the like attached to the shoulder body 13 is disposed on the outer peripheral side of the upper opening end of the heat insulating cylindrical portion 15. Specifically, this heat insulating member 16
Is located on the outer periphery of the heat insulating cylindrical portion 15 and on the upper side thereof, and blocks heat radiation from the upper open end of the heat insulating cylindrical portion 15 having poor heat insulating properties.

On the other hand, the lower opening end of the heat insulating cylindrical portion 15 is
It extends downward beyond the opening edge portion 8a of the protective frame 2 and shields the lateral space of the induction heating coil 11 from heat. A magnetic shield 17 is arranged between the induction heating coil 11 and the heat insulating cylindrical portion 15. With this magnetic shield plate 17, the heat insulating cylindrical portion 1
The induction heating coil 11 does not induce induction heating of 5 and the internal vacuum state is not disturbed.

A sensor (not shown) is provided below the side surface of the inner container to detect the temperature of the inner pot 5.

In the induction heating type rice cooker having the above-mentioned structure, when the induction heating coil 11 is energized, the inner pot 5 is induction-heated and the rice cooking is started. Then, when the rice cooking is completed, the energization rate of the induction heating coil 11 is suppressed, and the heater 12 is energized to keep the inner pot 5 warm via the inner case 3.

The radiant heat generated from the inner pot 5 is shielded by the air insulating layer 9 of the protective frame 2 on the bottom surface side and by the heat insulating cylindrical portion 15 on the side surface side. At the upper opening end of the heat insulating cylindrical portion 15, the heat insulating member 16 disposed on the outer peripheral side thereof.
Since the heat insulation performance is improved by this, the amount of heat radiation from this portion is also suppressed. Further, since the lower opening end of the cylindrical portion 15 extends downward beyond the opening edge 8a of the protective frame 2, the heat retaining property of the lower portion of the inner pot 5 where radiant heat is likely to occur is improved. . Therefore, the induction heating coil 1
Even if the power consumption of 1 or the heater 12 is suppressed, the inner pot 5 is appropriately heated or kept warm.

[0029]

As is clear from the above description, according to the heat insulating structure of the rice cooker according to the present invention, the protective frame has the double structure having the air heat insulating layer inside, so that the structure is simple.
It is possible to improve the heat insulation performance of the inner pot at low cost and suppress power consumption.

Further, since the protective frame is composed of two parts, the upper frame and the lower frame, the processing can be performed easily and the heat reflecting portion can be easily formed. Since the reinforcing portion is provided, it is possible to secure the air heat insulating layer while increasing the strength of the protective frame and suppressing the increase in size.

In particular, since the heat reflecting portion is formed on the protective frame, and the air insulating layer, the heat insulating cylindrical portion having the vacuum double structure, and the heat insulating member are arranged on the outer peripheral portion of the inner case, the inner portion is further improved. It is possible to improve the heat retention performance of the pan.

[Brief description of drawings]

FIG. 1 is a partial side sectional view of a rice cooker according to this embodiment.

FIG. 2 is a partial side sectional view of a rice cooker according to a conventional example.

[Explanation of symbols]

2… Protection frame 3 ... Inner trunk 4 ... Inner container 5 ... Inner pot 7 ... Top frame 8 ... bottom frame 9 ... Air insulation layer 10 ... Heat reflection layer 11 ... Induction heating coil 12 ... Heater

Continued front page    (72) Inventor Kunihiro Hoshika             Elephant 1-20-5 Tenma, Kita-ku, Osaka City, Osaka Prefecture             In Mahobin Co., Ltd. F-term (reference) 4B055 AA02 AA09 BA23 BA28 CA09                       CA16 CA17 CA19 CA68 CA71                       CA75 CB03 CB18 CB27 CC04                       CC43 CC45 CC58 DA02 DA03                       DB03 DB14 DB21 DB22 EA05                       FA06 FA16 FA17 FB01 FC11                       FC20

Claims (10)

[Claims] 1. An inner container consisting of an inner shell and a protective frame is formed in a container body, and an inner pan is arranged in the inner container so that the inner pan can be taken out of the inner container. An induction heating rice cooker for induction heating the inner pot by the induction heating coil, wherein the protection frame has a double structure having an air heat insulating layer inside. 2. The induction heating rice cooker according to claim 1, wherein the inner body is made of a cylindrical metal plate. 3. The induction heating rice cooker according to claim 2, wherein a heater capable of controlling electric power is provided on the outer peripheral surface of the inner case, separately from the induction heating coil. 4. The protective frame is composed of two parts, an upper frame and a lower frame, as claimed in any one of claims 1 to 3.
Induction heating rice cooker according to the item. 5. The induction heating rice cooker according to claim 4, wherein a reinforcing portion is formed on at least one of the lower surface of the upper frame and the upper surface of the lower frame. 6. The induction heating rice cooker according to claim 4, wherein a heat reflecting portion is formed on at least one surface of the upper frame or the lower frame on which the air heat insulating layer is formed. 7. The induction heating type rice cooker according to claim 1, further comprising a heat insulating cylindrical portion having a heat insulating space therein, on the outer peripheral side of the inner case. 8. The induction heating rice cooker according to claim 7, wherein the heat insulating cylindrical portion has a vacuum double structure. 9. The induction heating type rice cooker according to claim 7, wherein a heat insulating member is provided on an outer periphery of an upper portion of the heat insulating cylindrical portion. 10. The heat insulating cylindrical portion is provided with a lower portion extending to a side of the induction heating coil, and a magnetic shield is disposed between the heat insulating cylindrical portion and the induction heating coil. Alternatively, the induction heating rice cooker according to item 9.