JPH119443A - Electromagnetic induction heating type rice cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve heating and insulating efficiencies and to save energy without deteriorating the basic performances such as rice cooking performance. SOLUTION: A prescribed clearance is formed in the respective outsides of the outer bottom face and the outer side of a pot storage part 5 so that a shell insulation wall 23 and a coil cover 25 which cover the outer bottom surface and the outer side are provided. The shell insulation wall 23 and the coil cover 25 are composed of a plastic or an electrical insulating material. A heating coil 21 for heating the pot 4 by electromagnetic induction is provided in the clearance between the pot storage part 5 and the coil cover 25. This constitution can efficiently heat and insulate the pot and allows the heat generation of the heating coil 21 itself to be used for the heating and insulation of the pot 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic induction heating type rice cooker for cooking and maintaining rice by electromagnetic induction heating, and more particularly to a heat insulation structure.

[0002]

In the rice cooker of the electromagnetic induction heating type, the heating coil, which is a heating means for generating heat in the pot, is provided on the outer bottom surface of the pot accommodating portion, or the outer bottom surface and the lower portion of the outer surface, or the outer bottom surface. Provided on the upper and lower outer sides. Then, when a predetermined high-frequency current is supplied to the heating coil, the magnetic metal material of the pot provided in the magnetic field near the heating coil generates heat, and the pot is heated by electromagnetic induction. It is configured to be.

[0003] By the way, the reduction of power consumption has been one of the major technical problems in the past because of the recent energy situation. The biggest way to achieve energy savings is to reduce the amount of heating, but simply reducing the amount of heating
Insufficient heating during cooking may cause problems such as increased uneven cooking.

[0004] Generally, in a rice cooker, if the heat escapes to the outside without contributing to the heating of the pot, the heating efficiency deteriorates, resulting in poor rice cooking such as uneven cooking and an increase in power consumption. Various heat insulation structures have been proposed to prevent the occurrence of heat and reduce the amount of power consumed during cooking and keeping warm. For example, an air layer is formed by covering the side surface of the pan accommodating portion with aluminum, stainless steel, or steel plate, or an electric heater for heating the side surface of the pan is provided in the air layer. However, in an electromagnetic induction heating rice cooker, when a material having conductivity is selected as a heat insulating material, a problem such as a short circuit occurs when the heat insulating material comes into contact with a heating coil, and
Since the bottom of the pan mainly generates heat, a sufficient effect cannot be expected with a heat insulating material covering the side surface of the pan storage section.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide an electromagnetic induction heating type rice cooker which can realize energy saving without deteriorating basic performance such as rice cooking performance. I do.

[0006]

According to the first aspect of the present invention, there is provided an electromagnetic induction heating type rice cooker, comprising:
A pan storage section for storing the pan, and heating means for heating the pan by electromagnetic induction heating; and an outer bottom surface and an outer side of the pan storage section outside the outer bottom surface and the outer side surface of the pan storage section. A predetermined gap is formed between the side surface and the side surface, and a wall portion made of an electrically insulating material is provided to cover the outer bottom surface and the outer side surface.

At the time of cooking rice or the like, the pot accommodated in the pot accommodating portion is heated by electromagnetic induction by the heat generating means. At this time, heat insulation is performed by the wall that covers the outer bottom surface and the outer surface of the pan storage unit with a predetermined gap. Since this wall portion is made of an electrically insulating material, no problem such as a short circuit occurs even when a charged portion such as a heating means for electromagnetic induction heating contacts.

According to a second aspect of the present invention, in the electromagnetic induction heating type rice cooker according to the first aspect of the present invention, the heat generating means is disposed between an outer surface of the pot housing and the wall.

[0009] Thus, the heat generated by the heat generating means itself is supplied to the pot accommodating portion side, and is used for heating and keeping the temperature of the pot.

According to a third aspect of the present invention, in the electromagnetic induction heating rice cooker according to the first or second aspect of the present invention, a side space formed by an outer side surface of the pot housing portion and a side portion of the wall portion; A communication portion is provided for mutually ventilating an outer bottom surface of the housing portion and a bottom space formed by a bottom portion of the wall portion.

[0011] For example, even when the heat generating means is provided only on the bottom side of the pot housing, the heat generated on the bottom side is transmitted from the bottom space to the side space via the communicating portion, and the heating efficiency of the side of the pot is improved. .

According to a fourth aspect of the present invention, in the electromagnetic induction heating type rice cooker according to the first or third aspect of the present invention, the heat generating means is disposed between an outer surface of the pot housing and the wall. The means is a common heating means for the pot during cooking and keeping warm.

The presence of the heat generating means between the pot housing and the wall allows the heat generated by the heat generating means to be supplied to the pot housing, thereby enhancing the heat insulation of the pot. Since the heating means heats not only during cooking but also during warming, the effect of keeping the pot warm can be obtained both during cooking and during warming.

According to a fifth aspect of the present invention, in the electromagnetic induction heating type rice cooker according to any one of the first to fourth aspects, the wall portion is made of plastic, and the outer bottom surface and the outer side surface of the pan housing portion and the wall portion are formed. Is made 1 mm or more and 9 mm or less.

In general, plastics are more excellent in heat insulating properties than metals, so that they can be effectively insulated. Further, the gap between the outer bottom surface and the outer side surface of the pan housing portion and the wall portion is too narrow, and the heat insulation may be impaired due to contact due to a manufacturing error or the like. If the width is too wide, air convection occurs inside and the heat insulating effect is reduced. Therefore, the diameter is preferably 9 mm or less.

[0016] The invention of claim 6 is the invention of claim 1, 2 or 4.
In the rice cooker of the electromagnetic induction heating type, there is provided a main body having the pan housing portion and the heating means, and the heating means for heating the pan is not provided on the main body side except for the heat generating means for electromagnetically heating the pan. It is configured.

[0017] By the above-mentioned improvement of the heat insulating property, the pot can be sufficiently heated and kept warm even if there is no heating means other than the heating means for electromagnetic induction heating on the vessel body side.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.
In FIG. 1 showing an overall sectional view of a rice cooker, reference numeral 1 denotes a main body,
Reference numeral 2 denotes an outer frame which forms an outer shell of the main body 1, and a bottom plate 3 is fitted and fixed to the open lower end of the outer frame 2. Further, inside the outer frame 2, a bottomed cylindrical pot housing portion 5 for detachably housing the pot 4 is provided. The pan storage wall 6 that forms the side surface of the pan storage section 5 is formed integrally with the outer frame 2 that forms the upper portion of the pan storage section 5. The material of the outer frame 2 is an electrical insulator such as polypropylene which is a plastic material, has a glossy appearance, and has a ball pressure temperature specified by the Electrical Appliance and Material Control Law of 140 ° C or higher. doing. On the other hand, the coil base 7 which is a separate part from the outer frame 2 and forms the bottom of the pan housing 5 is
For example, it is made of an electrical insulator such as a material containing glass fiber in polyethylene terephthalate, has flame retardancy, and has an upper limit of the operating temperature of 12 for the electrical insulator specified in the Electrical Appliance and Material Control Law.
The material selected from materials at 0 ° C or higher is used. Then, the bottomed cylindrical pot 4 that accommodates a cooked product such as rice or water during rice cooking and stores a warmed product such as rice during warming can be inserted into and removed from the inside of the pan storage unit 5. Will be accommodated.

The pot 4 is made of a material selected from materials having good heat conductivity, such as aluminum, as a main material.
11 are formed. The pot body 11 is formed by die casting or molten metal forging, and at the time of molding, heat is generated by forming a material selected from a magnetic metal material such as ferritic stainless steel into a predetermined dish shape on the bottom and lower side of the pot body 11. The body 12 is joined. At the upper part of the pan 4, a flange portion 13 extending outward in the horizontal direction is formed.
The lower surface of the pan 4 is placed on the upper end of the pan storage section 5 so that the pan 4 is stored in a suspended state inside the pan storage section 5. At this time, a gap 14 of about 1 mm or more and 6 mm or less (hereinafter, simply referred to as 〜) is formed between the outer surface of the pan 4 and the inner surface of the pan storage portion 5, and as a heat insulating space. The configuration is such that the heat retention of the pan 4 is enhanced.

Reference numeral 15 denotes a pot temperature sensor which is a pot temperature detecting means provided at the center of the bottom of the coil base 7. The pan temperature sensor 15 is elastically pressed against the bottom of the outer surface of the pan 4 by a coil spring (not shown), and constantly detects the temperature of the cooked rice or the warmed food in the pan 4. In addition, heating during rice cooking and heat retention is controlled. The outer surface of the portion of the pot temperature sensor 15 that contacts the pot 4 is formed of aluminum having good thermal conductivity.

Reference numeral 21 denotes a heating coil provided on the outer surface of the coil base 7 as a heating means. This heating coil 21
The pot 4 is used for both induction heating and heating by electromagnetic induction heating. The pot 4 is provided at a position facing the bottom surface and the lower side surface of the pot 4 in a state facing the heating element 12. In addition, the heating coil 21 may be provided only on the bottom surface of the pan 4 or in a state where the heating coil 21 is opposed to a plurality of locations on the side surface of the pan 4. Outside the pot housing wall 6, a side space 22 having a predetermined gap a of 1 to 9 mm, preferably 1 to 5 mm, is interposed between the outside of the pot housing wall 6 and the pot. A trunk heat insulating wall 23 is provided as a side of the wall covering the housing wall 6. The body heat insulating wall 23 is formed integrally with the outer frame 2 similarly to the pot housing wall 6 and has a material thickness of 0.8 to 0.8 mm.
Formed to 3.0mm. Therefore, the pot housing wall 6 and the body heat insulating wall 23 are formed of the same material as the outer frame 2 at the same time as plastic injection molding and have a reasonable productivity.

Outside the coil base 7, a bottom space 24 having a gap b of 1 to 9 mm, preferably 1 to 5 mm, is interposed between the coil base 7 and the outer bottom surface thereof. A bottom coil cover 25 is provided. However, at the place where the heating coil 21 is disposed, a bottom space 24 having a gap larger than the thickness of the heating coil 21 is formed. Similar to the coil base 7, the material of the coil cover 25 is an electrical insulator such as a material containing glass fiber in polyethylene terephthalate, which is a plastic material. The insulator used is selected from materials whose upper limit of operating temperature is 120 ° C or higher. The material thickness of the coil cover 25 is 1.2 to 3.5 mm. Then, the coil cover 25 is used for the coil base 7.
When the bottom portion of the pot housing 5 is covered, the gap at the lower end of the pot housing wall 6 is substantially shielded, and the outer bottom surface and the outer surface of the pot housing portion 5 have side spaces 22 respectively.
And the bottom surface space 24 are communicated with each other by a communication portion 26, and are formed by ventilation. It is preferable that the side space 22 and the bottom space 24 be completely sealed spaces. However, the fitting portion of each member, the outlet of a lead wire (not shown) of the heating coil 21, the There may be some gaps such as a part where the temperature sensor 15 is mounted. The heating coil 21 has a spiral shape, is partially adhered and fixed to the outer surface of the coil base 7 with a silicone adhesive or the like, and has a structure in which the heating coil 21 is further covered by a coil cover 25 from below and does not fall. Therefore, the heating coil 21 is configured to be disposed in the gap between the coil base 7 and the coil cover 25, that is, in the bottom space 24. Further, in order to prevent falling and vibration, it is preferable that the gap between the coil base 7 and the coil cover 25 where the heating coil 21 is provided is not formed. A ferrite member 27 that prevents leakage of magnetic flux from the heating coil 21 is mounted outside the coil cover 25.

In the outer frame 2, a heating substrate 31 is provided below the ferrite member 27. This heating substrate 31
In each case, a heating board unit 32 constituting a control circuit of the heating coil 21 and a switching element 33 as a heat generating component are mounted. The heating substrate unit 32 includes an inverter circuit and the like, and supplies a predetermined high-frequency current to the heating coil 21. By supplying the high-frequency current, a magnetic field is generated in the heating coil 21, and the heating element 12 of the pan 4 is heated by electromagnetic induction heating to heat the pan 4. It is the same as a jar type insulated pot.
Further, between the switching element 33 for generating the high-frequency current and the heating substrate 31, a heat radiating plate 35 having a large number of fins 34 formed downward is attached in a state of being in close thermal contact. The lower ends of the fins 34 are opposed to the ventilation holes 36 formed in the bottom plate 3 and are configured to circulate heat with the outside air.

Reference numeral 37 denotes a substrate provided inside the front portion of the outer frame 2. A power supply unit 38 for forming a power supply circuit is provided on the substrate 37 downward, and an LCD or L
A display operation unit 39 including a display unit such as an ED and an operation unit including various switches is provided to face an operation panel 40 mounted on the front surface of the outer frame 2. Reference numeral 41 denotes a code reel provided inside the rear portion of the outer frame 2,
This is for winding a power cord (not shown).

Reference numeral 51 denotes a lid that directly covers the upper opening of the pot 4. The lid 51 is made of a plastic resin material such as polypropylene, and an outer lid 52 forming an outer surface of the lid 51,
An outer lid cover 53 made of a plastic resin material such as polypropylene, which is formed on the lower outer periphery of the lid 51 and does not face the upper opening of the pan 4 and is fitted to the lower outer periphery of the outer lid 52; And a lower surface member 54 which forms a portion of the lower surface of the lid 51 facing the upper opening of the pot 4. A flange-shaped fixing portion 55 that is attached and fixed to the outer lid cover 53 via a screw (not shown) is formed on an outer peripheral portion of the lower surface member 54, and a hole 56 is provided at the center in other portions. A base 57 is formed. The lower surface of the base 57 is designed to maintain good appearance and cleanability when the lid 51 is opened.
Except for the recessed portion 58, it is formed in a flat shape in which screws and the like are not exposed. An annular groove 59 is formed on the upper surface of the base 57. These recesses 58 and grooves 59 are provided to suppress a rise in the temperature of the fixing portion 55 on the outer peripheral portion of the lower surface member 54.

A lid temperature sensor 61 as a lid temperature detecting means for detecting the temperature of the lower surface member 54 is provided on the upper surface, that is, the rear surface of the lower surface member 54, and the lower surface member 54 is heated at the time of cooking rice and keeping the temperature warm to prevent dew condensation. Each is provided with a lid heater 62 serving as lid heating means. Then, the temperature information from the lid temperature sensor 61 is received, and while the power of the lid heater 62 is controlled, the temperature of the lid body 51, in particular, the temperature of the lower surface member 54 is controlled.

Inside the lid 51, a lid lower surface heat shield plate 63 for shielding heat from the lower surface member 54 is provided so as to cover the back surface of the lower surface member 54. Further, another outer cover heat shield plate 64 is provided inside the outer cover 52. Between the outer lid cover 53 and the lower surface member 54 is formed of an annular elastic body, and when the lid 51 is closed,
A lid packing 65 whose lower part is in close contact with the upper surface of the pan 4 is provided. The lid 51 is pivotally supported on one side of the container main body 1, and a spring (not shown) for urging the lid 51 in a direction in which the lid 51 is always opened is disposed on the hinge 66 serving as a pivotal support. Then, when the clamp button 67 for locking the lid 51 on the opposite side of the hinge 66 is released, the lid 51 is automatically opened.

The upper surface of the outer lid 52 is provided with a concave portion 71 depressed toward the pot 4 side. The hole 56 of the lower surface member 54 corresponding to the center of the concave portion 71 is a steam cylinder forming a lower portion of the steam port 72.
73 is to be mounted, and the recess located around the hole 56
The space between the bottom back side of the base 71 and the back side of the lower surface member 54 is sealed with a steam port packing 74 made of silicone rubber. Steam port 72
Are each formed of a steam port cap 75 and a steam port case 76 made of, for example, polypropylene resin having excellent steam resistance. Mounted freely. In addition, a closing plate 77 that opens and closes the upper opening of the steam cylinder 73 is attached to the upper opening of the steam cylinder 73 so as to be vertically movable. Then, when the steam generated in the pot 4 during the rice cooking flows into the steam cylinder 73 together with the dissolved water (neba) of the starch, the steam pushes up the shielding plate 77 by the pressure, and the opened steam cylinder is opened. 73
From the upper opening of the steam port 72. here,
Steam is separated from the one, and the one with the higher specific gravity is the steam outlet.
The steam is discharged to the outside from a steam outlet 78 formed in the steam port cap 75 while being stored in the lower portion of the steam outlet cap 75. Then, when the rice cooks and becomes uneven, the internal pressure of the pot 4 decreases, so that the ladle collected in the lower part of the steam port 72 is returned into the pot 4 from the return hole 79. At the same time, the shielding plate 77 is also lowered so as to close the upper opening of the steam cylinder 73 to prevent the release of heat.

Next, the operation of the above configuration will be described. At the time of cooking rice, the lid 51 is opened, the pot 4 containing the rice to be cooked and water is accommodated in the pan accommodating portion 5 of the container body 1, and the lid 51 is closed. In this state, the lower surface member of the lid 51
The surface of 54 directly covers the upper opening of the pan 4. Then, when rice cooking is started by operating the operation means in the display operation unit 39, the heating element 12 of the pan 4 is heated by high-frequency power supply to the heating coil 21, and the pan 4 is heated. Heating of pan 4
It is controlled in accordance with the temperature of the pan 4 detected by the pan temperature sensor 15. That is, at the time of cooking rice, the heating output of 500 to 1300 W is intermittently controlled by adjusting the high-frequency current supplied to the heating coil 21, and the pot 4 is heated to cook rice. After the rice is cooked, the rice in the pan 4 is kept at a predetermined temperature by heating the pan 4 by high-frequency power supply to the heating coil 21. At the time of this heat retention, intermittent heating of 1 second on and 10 seconds off is performed with a heating output of 500 W, and the temperature of the pan 4 is maintained at a predetermined temperature, for example,
If the temperature is 71 ° C., the temperature is adjusted by omitting the ON for one second and the temperature is kept. Thus, the heating coil 21 serving as a heat source of the pan 4
The pan 4 is heated by both the rice cooking and the heat keeping by the power supply to the pot. The heating of the lid heater 62 prevents dew condensation from occurring on the surface of the lower surface member 54 of the lid 51 during the period from rice cooking to heat retention.

According to the configuration of the above-described embodiment, the predetermined gaps a and b are formed outside each of the outer bottom surface and the outer side surface of the pan housing 5.
And a body heat insulating wall 23 and a coil cover as walls made of an electrically insulating material covering the outer bottom surface and the outer surface.
Since 25 is provided, the heat insulating property of the outer bottom surface and the outer surface of the pot housing part 5 is improved, and the heat insulating property of the pot 4 is improved at the time of cooking rice and at the time of keeping heat, so that the heating efficiency is improved. Therefore, the power consumption can be reduced and energy saving can be realized without deteriorating the basic performance such as the rice cooking performance, that is, while preventing the problem that the cooking unevenness increases due to insufficient heating during the rice cooking. Further, since the body heat insulating wall 23 and the coil cover 25 are made of an electrically insulating material, even if the coil cover 25 or the body heat insulating wall 23 comes into contact with a charged portion such as the heating coil 21,
No problems such as electrical shorts occur. Therefore, the assemblability is extremely good. Moreover, since the body heat insulating wall 23 and the coil cover 25 are made of plastic, any shape according to the mounting shape can be easily realized by injection molding. Further, plastic has a lower thermal conductivity than metal, so that a higher heat insulating effect can be obtained. In addition, since the heat radiation to the outside from the side of the pan 4 is suppressed, the heating efficiency of the side of the pan 4 is improved.
The heating of the side surface is strengthened, and the effect of suppressing uneven heating can be obtained. In addition, if a material having flame retardancy is selected as an electrical insulator used for a portion of the heating coil 21, that is, the coil cover 25, even if abnormal heat is generated due to a short circuit or the like, it is possible to prevent spread of fire to other portions. , Safety can be ensured. Furthermore, the formation of the side space 22 and the bottom surface space 24, which are closed spaces outside the outer side surface and the outer bottom surface of the pot housing portion 5, can be simultaneously realized by assembling only by covering the coil cover 25 from the bottom surface direction of the pot housing portion 5. Good assemblability.

The heating coil 21 generates heat by supplying high-frequency current when cooking rice or keeping the temperature warm. However, since the heating coil 21 is arranged in the bottom space 24 between the pot housing 5 and the coil cover 25, Bottom space 24 due to heat generated by heating coil 21 itself
Further, an effect of heating the inside of the side space 22 can be obtained. If the heating coil 21 is exposed without being arranged in the closed space, the heat generated by the heating coil 21 will be freely radiated into the inside of the vessel main body 1, but the heating coil 21 must be arranged in the space 24. As a result, the heat of the heating coil 21 is supplied to the outer space of the pot housing 5, and the heat generated by the heating coil 21 can be utilized for improving the efficiency of heating and heat insulation around the pot housing 5. As described above, by increasing the heat insulating property of the pot 4 during rice cooking and heat keeping, rice cooking and heat keeping with higher heating efficiency can be realized, and the power consumption can be further reduced. The heating coil 21 may be provided at the bottom of the pot 4, or at the bottom and the lower portion of the side surface, or at a plurality of locations on the bottom portion and the side surface. In particular, it is possible to prevent the side surface of the pan 4 from being cooled at the time of keeping the temperature, and to obtain the effect of suppressing the temperature unevenness.

Further, a side space 22 between the outer surface of the pot housing 5 and the body heat insulating wall 23 and a bottom space 24 between the outer bottom surface of the pot housing 5 and the coil cover 25 are communicated with each other by a communication portion 26. Therefore, even when the heating coil 21 is provided only in the bottom space 24, the heat generated by the self-heating of the heating coil 21 is easily supplied to the side space 22 side, and the side surface of the pan 4 is efficiently heated. The heat retention is improved. In addition, most rice cookers are equipped with a cord-shaped electric heater as a heating means for keeping the side of the pot warm while keeping the temperature warm. Since the heat is maintained by using the heat generated, the side surface can be maintained by using only the heating coil 21 as the heating source without using a heating means such as another electric heater other than the heating coil 21 on the container body 1 side. Therefore, it is possible to simplify the structure without deteriorating the heat retention performance such as increase in the heat retention unevenness, and to reduce the power consumption during the heat retention because the power consumption of the electric heater is eliminated.

By the way, it is generally known that, when the gap of the heat insulating space becomes large, the heat insulation effect becomes thinner due to the convection of the air inside. However, if the gap is made as close as possible to zero, there is a possibility that due to variations in dimensions of the components forming the heat insulating space, these components are partially in contact with each other and the function of the heat insulating space is lost. Therefore, in order to prevent contact, it is desirable to set the minimum gap to 1.0 mm. That is, in the present rice cooker, the gaps a and b between the outer side surface and the outer bottom surface of the pot housing portion 5 forming the side space 22 and the bottom space 24 as the heat insulating space and the body heat insulating wall 23 and the coil cover 25 are 1.0 mm or more. It is desirable to do.

Further, as described above, the larger the gap, the thinner the heat insulating effect. Therefore, the upper limit of the gap should be set, and the following test was conducted. In this test, the gap a of the side space 22 was set to 1 mm, 5 mm, 9 mm, 13 mm, 17 mm.
It was confirmed in a long-term heat retention test in which the power consumption was maximized by adjusting to mm. The test method is to measure the power consumption when 1.8L rice is cooked at room temperature of 20 ° C and rated voltage of 100V, and then kept warm for 12 hours. The result is 428Wh for the conventional structure without the heat insulation space, 426Wh for the 17mm gap (0.5% reduction compared to the conventional structure), 424Wh for the 13mm gap (0.9% reduction compared to the conventional structure), and 9mm for the 9mm clearance. 407Wh (4.9% reduction from the conventional structure), 398Wh (7.0% reduction from the conventional structure) at 5mm gap, and 395Wh (7.7% reduction from the conventional structure) at 1mm gap. From these results, it was concluded that the gaps a and b were preferably less than 10 mm, and more preferably 5 mm or less.

That is, by setting the gaps a and b between the side space 22 and the bottom space 24 to 1 to 9 mm, the heat insulation of the pot housing 5 can be reliably and efficiently increased, and the heat insulation of the pot 4 can be improved. To improve power consumption during use.

Further, the thickness of the plastic body heat insulating wall 23 and the coil cover 25 is 1.5 to 2.5 mm even when the material thickness is 0.8 to 3.5 mm.
If the thickness is about mm, the heat insulating effect is further improved.

Note that the present invention is not limited to the above-described embodiment, and various modifications can be made. For example,
In the above-described embodiment, the body heat insulating wall 23 and the coil cover 25 that respectively cover the outer side surface and the outer bottom surface of the pot housing portion 5 are separate members, but the wall portion that covers the outer surface and the outer bottom surface of the pot housing portion 5 is entirely formed. It may be made of an integral member. Further, in the above-described embodiment, the pot housing portion 5 is constituted by the two members of the pot housing wall 6 and the coil base 7 integrated with the outer frame 2, but the pot housing portion may be entirely formed of an integral member. .

[0038]

According to the electromagnetic induction heating type rice cooker according to the first aspect of the present invention, a predetermined space is provided between the outer bottom surface and the outer surface of the pot housing portion outside each of the outer bottom surface and the outer surface of the pot housing portion. A wall made of an electrically insulating material is provided to cover the outer bottom surface and the outer surface by forming a gap between the pots, so that the heat insulation of the pot can be improved without causing a problem such as an electric short circuit, and the unevenness of the heating can be improved. Power consumption during use can be reduced without deteriorating basic performance.

According to the electromagnetic induction heating type rice cooker according to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, the heat generating means is disposed between the outer surface of the pot housing and the wall. The heat generated by the heating means itself can be effectively used for heating the pan, and the heating efficiency can be further improved.

According to the third aspect of the present invention, in addition to the effects of the first and second aspects of the present invention, in addition to the effects of the first and second aspects, the side space formed by the outer side surface of the pot housing portion and the side portion of the wall portion. And, since the communication part which mutually ventilates the bottom space formed by the outer bottom surface of the pot housing part and the bottom part of the wall part is provided,
For example, even if the heating means is provided only on the bottom side of the pot housing, the side of the pot can be efficiently heated, and it is not necessary to provide another electric heater on the side of the pot housing.

According to the electromagnetic induction heating type rice cooker of the invention of claim 4, in addition to the effect of the invention of claim 1 or 3, a heating means is provided between the outer surface of the pot housing and the wall. Since this heating means is a heating means of a common pot at the time of cooking and keeping warm, the heat generated by the heating means itself can be effectively used for heating the pot, and the heating efficiency can be further improved, and this effect can be further improved. Can be obtained with a simple structure both when cooking and keeping warm.

According to the electromagnetic induction heating type rice cooker according to the fifth aspect of the present invention, in addition to the effects of any one of the first to fourth aspects of the present invention, the wall is made of plastic, Since the gap between the side surface and the wall portion is set to 1 mm or more and 9 mm or less, the heat insulation performance can be further improved, and a decrease in heat insulation due to a manufacturing error can be prevented.

According to the electromagnetic induction heating type rice cooker of the invention of claim 6, in addition to the effect of the invention of claim 1, 2 or 4,
Since the heating means for heating the pan is not provided on the vessel body except for the heating means for heating the pan by electromagnetic induction heating, the structure can be simplified without impairing the heatability and heat retention of the pan, and energy can be saved. Can be planned.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of an electromagnetic induction heating type rice cooker according to the present invention.

[Explanation of symbols]

 4 Pot 5 Pot storage section 21 Heating coil (heating means) 22 Side space 23 Body heat insulation wall (side of wall) 24 Bottom space 25 Coil cover (bottom of wall) 26 Communication part a Gap in side space b Bottom space Gap

Claims (6)

[Claims] A pan, a pan accommodating section for accommodating the pan, and a heating means for heating the pan by electromagnetic induction heating;
Outside of each of the outer bottom surface and the outer surface of the pot housing portion, a predetermined gap is formed between the outer bottom surface and the outer surface of the pot housing portion to cover the outer bottom surface and the outer surface. An electromagnetic induction heating type rice cooker characterized by having a wall portion. 2. The electromagnetic induction heating type rice cooker according to claim 1, wherein the heat generating means is provided between an outer surface of the pot housing portion and the wall portion. 3. A side space formed by an outer side surface of the pot housing portion and a side portion of the wall portion, and a bottom space formed by an outer bottom surface of the pot housing portion and a bottom portion of the wall portion. The electromagnetic induction heating type rice cooker according to claim 1 or 2, further comprising a communicating portion for ventilation. 4. The heat generating means is disposed between the outer surface of the pot housing portion and the wall, and the heat generating means is a common heat generating means for the pot during cooking and keeping warm. The electromagnetic induction heating rice cooker according to claim 1 or 3. 5. The method according to claim 1, wherein the wall is made of plastic, and a gap between the outer bottom surface and the outer surface of the pot housing and the wall is 1 mm or more and 9 mm or less. An electromagnetic induction heating rice cooker according to any one of the preceding claims. 6. A container main body having the pan housing portion and a heat generating means, wherein the heating means for heating the pan is not provided on the container main body side except for the heat generating means for electromagnetically heating the pan. The electromagnetic induction heating type rice cooker according to claim 1, 2 or 4, wherein: