JP2738083B2 - rice cooker - Google Patents

Description

The present invention relates to a rice cooker used in a general household,
In particular, it relates to a rice cooker with an improved heater.

2. Description of the Related Art Conventionally, as a heater of a rice cooker, two types of (1) an aluminum cast heater in which a sheathed heater is embedded in an aluminum cast and (2) a sheathed heater (high temperature type) are mainly used. When using a cast-in heater, a direct heating method in which the pot and the heater are in direct contact is adopted. When using a sheathed heater (2), an indirect heating method in which the pot and the heater do not contact is adopted, and the heater to be used is used. The fact is that the position of the pot and the heater is changed depending on the type.

Problems to be Solved by the Invention However, in the direct heating method using the cast aluminum heater of (1), although the pot and the heater are in contact with each other, the heat efficiency is excellent, but heat transfer from the heater to the pot occurs by heat conduction. Therefore, depending on the degree of contact between the pot and the heater, the temperature sensor located in the center of the heater and the top of the pot may cause an imbalance in heat transfer depending on the location, making it easier for the cooker to cook unevenly, resulting in an overall taste. There was a problem of falling.

On the other hand, in the case of (2), in the indirect heating method using a sheathed heater of a high-temperature type, heat is transferred from the heater to the pan by heat radiation, so that a portion close to the heater is squeezed,
In the part far from the heater (upper part of the pot), there is a problem that the cooking becomes uneven and the taste is reduced, and there is a problem that the heating efficiency is poor due to indirect heating.

An object of the present invention is to solve the above problems and to provide a rice cooker excellent in rice cooking performance and thermal efficiency.

Means for Solving the Problems In order to solve the above problems, the present invention removably mounts a pot for storing cooked food in a protection frame fixed in the main body, and the bottom of the protection frame and the pan A heater that seals both ends of a circular quartz tube in which argon gas or halogen gas-containing argon gas is sealed inside and tungsten is positioned in the center on the bottom of the protective frame in the space between the bottoms. Is provided, and the heater is housed in a gas-permeable protective cover. The surface of the quartz tube contains a material having excellent far-infrared radiation characteristics, and a hydrolysis product of a metal alkoxide is used as a binder. A corrosion-resistant coating is formed, and the protective cover is formed in a circular shape with a cross section of Π. Provide and cover A hunting hole is provided in the upper and side portions of the body or processed into a lath net shape, and the protective frame is bent into an arbitrary shape so as to efficiently and uniformly reflect the heat of the heater. It is made of aluminum-zinc alloy plated steel sheet.

Operation Conventionally, a heater in which a tungsten wire is positioned at the center of a straight quartz tube, argon gas or halogen gas containing halogen gas is sealed in the space, and both ends are sealed, is generally called a Colts heater or halogen heater. And
It is used as an illumination lamp and recently as a heater for a smooth heater.

However, the quartz tubes of these heaters are extremely sensitive to salt. In addition, there are problems such as poor mechanical strength, but the temperature rise is very fast, and although it is a heater with excellent thermal efficiency, it is not only a heater for rice cookers but also a heater for various cookers as described above. Apart from heaters, they have rarely been applied.

However, the present invention pays attention to the advantages of the Colts heater or the halogen heater, which has been conventionally difficult to apply as a heater for a cooker, and by utilizing this, the rice cooking performance which is a problem of the conventional rice cooker is considered. Also, the thermal efficiency is improved.

That is, in the present invention, by processing a conventional linear quartz tube into a circular shape, it is possible to achieve heat uniformity that could not be obtained by the conventional linear quartz tube.

As for the corrosion resistance to salt, a solution containing salt in a high-temperature region is formed by forming a corrosion-resistant coating using a mixture of zircon and alumina with a hydrolysis product of metal alkoxide as a binder on the surface of the quartz tube. Also, devitrification and cracking of the quartz tube hardly occurred, and it was possible to use even in such an environment.

Further, in terms of mechanical strength, the problem can be solved by installing a protective cover formed in a punched or lath shape on or around the heater.

By solving such a conventional drawback, application as a heater of a rice cooker, which has been conventionally considered difficult, has become possible, and the following effects have been obtained.

First, since the temperature rise of the heater is extremely fast, it has become possible to remarkably increase the thermal efficiency which has been difficult with the indirect heating method.

In addition, the shape of the protective frame for housing the heater and the pot is made as in the present invention. In particular, the material of the protective frame is made of aluminum having excellent reflection efficiency and capable of appropriately irregularly reflecting and uniforming the temperature.
By using a zinc alloy plated steel plate, the thermal efficiency of the heater can be further improved, and the heat of the heater can be uniformly supplied to the entire pot, so that the conventional cooking less unevenness and the rice cooking performance can be improved. .

Embodiment FIG. 1 is a partial cross-sectional view of a rice cooker of the present invention, FIG. 2 is a plan view of a heater of the rice cooker of the present invention, partially cut away, and FIG. 3 is a perspective view of the same protective cover.

In the drawing, reference numeral 1 denotes a substantially bottomed cylindrical body having an open upper surface, and a protective frame 3 made of a substantially bottomed cylindrical aluminum / zinc alloy-plated steel plate serving as a pan storage portion via a heat insulating material 2 therein. The outer periphery of the upper end of the protection frame 3 is fitted to an annular upper frame 4 made of heat-resistant plastic that is fitted around the upper end of the main body 1. The upper frame 4 is supported on the upper edge of the main body 1 by the projection 4-1.

Reference numeral 5 denotes a pot having an outwardly directed flange 6 formed at the upper end opening, which is disposed in the protective frame 3 by being placed on the upper surface of the upper frame 4 via the protective frame 3 of the flange 6. I have.

Further, a black ceramic coat is applied to the outer peripheral surface of the pot 5.

Numeral 7 denotes a heater bent in a circular shape. The periphery of the heater 7 is covered with a protective cover 8 punched in a punching shape, and further supported by an insulator 9.

On the other hand, the heater 7 has a tungsten wire at the center of the quartz tube 7a.
7b is supported by the support member and positioned at the center, the space 7c is filled with argon gas, and both ends of the quartz tube 7a are sealed.

On the surface of 7a, a mixture with zircon-rich alumina was used as a far-infrared radiating material, and metal alkoxide 1
A corrosion-resistant coating 7d is formed using a hydrolysis product of methyl silicate alkoxide as a binder.

A protective cover 8 exists in a heating space between the heater 7 and the pot 5.

Reference numeral 10 denotes a sensing element for detecting the rice cooking end temperature, which is attached to the bottom of the center of the protective frame 3.

Reference numeral 11 denotes a lever interlocked with the thermosensitive element 10, and reference numeral 12 denotes a microswitch for controlling energization of the heater, which is turned on and off by the lever 11.

 Reference numeral 13 denotes a display plate attached to the main body 1.

 Reference numeral 14 denotes a button, which is adhered to the lever 11.

Reference numeral 15 denotes a lid, which is attached to the open upper surface of the main body 1 so as to be freely opened and closed.

The protective cover 8 is a cover body having a circular cross section with a Π shape.
An annular edge 8B for attachment is formed on the outer periphery of the lower portion of 8A, and a disc 8C is integrally formed at the lower center, and openings 8D and 8E for leading out a quartz tube are provided. Is provided with a perforated hole 8F formed into a punched hole or lath net shape.

 Next, the operation of the rice cooker according to the present invention will be described.

The washed rice and water are stored in the pot 5, the pot 5 is stored in the protective frame 3, and the lid 15 is closed.

When the button 14 is pressed, the lever 11 rotates, the heat-sensitive element 10 linked to the lever 11 operates, the rice is put into the cooking state, the micro switch 12 is turned on, and the heater 7 is energized.

When the heater 7 generates heat, the air in the closed heating space is heated, and the pot 5 is heated via the heated air.

When the pot 5 is heated, rice is cooked.

When all the water in the pot 5 is not absorbed by the rice, the bottom of the pot 5 becomes empty and the temperature rises rapidly.

At this time, the temperature of the heat-sensitive element 10 also rises, the lever 11 is pushed down, the microswitch 12 is opened, the power supply to the heater 7 is stopped, and the rice cooking is completed.

In this way, the rice cooker of the present invention can cook rice. However, as described above, a Colts heater or a halogen heater having a high temperature rise is used as a heater, so that the rice cooker is compared with a conventional indirect heating system using a sheathed heater for high temperature. As a result, the thermal efficiency became excellent.

In addition, the use of aluminum-zinc alloy-plated steel plate to enhance the reflection and to make the reflection even, so that the whole pot is heated evenly, so that the cooking unevenness was greatly reduced and the rice cooking performance could be improved. .

Effect of the InventionThe rice cooker of the present invention has a tungsten tube positioned at the center of a quartz tube bent into a circular shape, and an argon gas or an argon gas containing a halogen gas is sealed in a space portion. In addition to using a heater sealed at both ends, the surface of the quartz tube contains a substance of a mixture of zircon and alumina with excellent far-infrared radiation characteristics, and is a corrosion-resistant coating using a hydrolysis product of metal alkoxide as a binder. Is formed, and a protective cover formed in a punched or lath shape is installed on or around the heater, so that the pot for storing the heater and the cooked rice further protects them. Located inside the frame,
This protective frame is made of an aluminum / zinc alloy-plated steel sheet that is bent into an arbitrary shape so as to efficiently and uniformly reflect the heat of the heater, and as a rice cooker, has excellent rice cooking performance and thermal efficiency. Is generated.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a rice cooker according to an embodiment of the present invention, FIG. 2 is a plan view of a heater of the rice cooker according to the present invention, and FIG. 3 is a perspective view of a protective cover of the present invention. Shown respectively. 1: body, 2: heat insulating material, 3: protective frame 4: upper frame, 5: pot, 6: flange, 7: heater, 7a: quartz tube, 7b:
Tungsten wire 7c: Space, 7d: Corrosion resistant coating, 8: Protective cover, 9: Insulator, 10: Thermal element 11: Lever, 12: Micro switch, 13: Display panel, 14: Button, 15: Lid

Claims (4)

(57) [Claims] 1. A pot for accommodating cooked food is removably mounted in a protection frame fixed in the main body, and a space between the bottom of the protection frame and the bottom of the pot is provided on the bottom of the protection frame. A heater is provided in which an argon gas containing an argon gas or a halogen gas is sealed, and a heater is provided in which both ends of a circular quartz tube in which tungsten is located at the center are sealed, and the heater is placed in a gas-permeable protective cover. Rice cooker configured by storing 2. The quartz tube according to claim 1, wherein a surface of the quartz tube is provided with a corrosion-resistant coating containing a substance having excellent far-infrared radiation characteristics and having a hydrolysis product of a metal alkoxide as a binder. Cooker described 3. A cover body in which the protective cover is formed in a circular shape with a cross section of Π, an annular edge portion is formed in a lower outer peripheral portion, a disk portion is integrally formed in a lower center portion, and an opening for leading out a quartz tube is provided. 2. The rice cooker according to claim 1, wherein a punched hole is provided in an upper portion and a side portion of the cover body, or the cover body is processed into a lath net shape. 4. The protection frame efficiently transfers heat from the heater,
2. The rice cooker according to claim 1, wherein the rice cooker is made of an aluminum-zinc alloy-plated steel sheet bent into an arbitrary shape so as to reflect light uniformly.