JPH03151916A - Rice cooker - Google Patents

Abstract

PURPOSE:To obtain a rice cooker prominent in the rice cooking ability and heat efficiently by mounting a heater of a circular quartz tube, in which gas argon is sealed and tungsten is placed in the center, on the bottom of a protection frame in a space between the bottoms of a body and a pot, and housing a heater inside a ventilated protection cover. CONSTITUTION:A substantially bottomed cylindrical protection frame 3, which works as a pot 5 housing part, is arranged inside a body 1 through an insulative material 2. A heater 7 bent in a circle is arranged on the bottom of the protection frame 3, covered with a protection cover 8 which is perforated, and further supported with insulators 9. The heater 7 consists of a quartz tube 7a, which has a tungsten wire 7b in the center and gas argon in a space 7c, and is sealed at the both ends. The surface of the quartz tube 7a is covered with an anti- corrosion film 7d composed of a mixture of zirconium and alumina, where the former is less than the latter, as a far infrared ray radiating material, and a product of hydrolysis of methyl silicate alkoxide as a coupling material. The protection cover 8 is arranged in a heating space between the heater 7 and the pot 5.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rice cooker used in general households, and particularly to a rice cooker with an improved heater.

Conventional technology There are two main types of heaters used in conventional rice cookers: (1) a cast-aluminum heater in which a sheathed heater is embedded in cast aluminum; and (2) a sheathed heater (high-temperature type). When using a cast aluminum heater, a direct heating method is used where the pot and heater come into direct contact, and when using a sheathed heater (2), an indirect heating method is used where the pot and heater do not come into contact.
The reality is that the positions of the pot and heater are changed depending on the type of heater used.

Problems to be Solved by the Invention However, in (1) the direct heating method using a cast aluminum heater, although the pot and heater are in contact with each other, the heat efficiency is excellent, but heat transfer from the heater to the pot occurs due to thermal conduction. Therefore, depending on the degree of contact between the pot and the heater, as well as in places such as the temperature sensor installed in the center of the heater and the top of the pot, unbalances in p heat transfer occur, which tends to cause uneven cooking during rice cooking, resulting in overall There was a problem with the taste being poor.

On the other hand, in the indirect heating method using a high-temperature type sheathed heater (2), the heat transfer from the heater to the pot occurs through thermal radiation, so the parts near the heater become sticky, and the parts far from the heater (in the pot) In the upper layer), there were problems such as uneven cooking such as hardness and poor taste, and poor thermal efficiency due to indirect heating.

The present invention aims to solve the above problems and provide a rice cooker with excellent rice cooking performance and thermal efficiency.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides the following methods: a pot for storing rice to be cooked is removably attached to a protective frame fixed inside the main body;
On the bottom of the protection frame in the space between the bottom of the protection frame and the bottom of the steel, there is a circular shape in which argon gas or argon gas containing nitrogen gas is sealed and tungsten is located in the center. A heater is provided by sealing both ends of a quartz tube, and the heater is housed within a breathable protective cover, and the surface of the quartz tube contains a substance with excellent far-infrared radiation characteristics, A corrosion-resistant coating is formed using a hydrolysis product of alkoxide as a binder, and the protective cover is formed into a circular shape with an n-shaped cross section.A ring line part is integrally formed on the lower outer periphery of the cover body, and a disc part is integrally formed at the lower center of the cover body. In addition to providing an opening for leading out the quartz tube, the cover main body is provided with notching-like holes in the upper and side portions or processed into a lath mesh shape, and the protective frame is configured to absorb the heat of the heater. It is constructed from an aluminum/zinc alloy plated steel plate that is bent into an arbitrary shape to ensure efficient and uniform reflection.

Function Conventionally, a heater in which a tungsten wire is placed in the center of a straight quartz tube, the space is filled with argon gas or argon gas containing halogen gas, and both ends are sealed is generally called a Korzuchita or halogen heater. , as a lighting lamp, and recently as a heater for smooth heaters.

However, the quartz tubes of these heaters are extremely sensitive to salt.

Furthermore, although there are issues such as poor mechanical strength, the temperature rises very quickly and the heater has excellent thermal efficiency. However, it is not suitable for use with beaters for rice cookers or as heaters for various cooking appliances. Apart from heaters, it has hardly ever been applied.

However, in the present invention, we focus on the advantages of the Colts heater or halogen heater, which have traditionally been considered difficult to apply as heaters for rice cookers, and utilize these advantages to solve the problem of rice cooking, which can be solved by conventional rice cookers. It has improved performance and thermal efficiency.

That is, in the present invention, by processing a conventional straight quartz tube into a circular shape, it has become possible to achieve thermal uniformity that could not be obtained with a conventional straight quartz tube.

In addition, for corrosion resistance against salt, a solution containing salt will adhere to the surface of the quartz tube by forming a corrosion-resistant coating on the surface of the quartz tube, using a mixture of silicon and alumina as a binder and a hydrolysis product of metal alkoxide. However, the quartz tube rarely suffers from devitrification or cracking, making it possible to use it even in such environments.

Furthermore, in terms of mechanical strength, it was possible to solve the problem by installing a protective cover processed into a punched or lath mesh shape above or around the heater.

By solving these conventional drawbacks, it has become possible to apply the device as a heater for a rice cooker, which has been said to be difficult in the past, and the following effects have been obtained.

First, because the temperature of the heater rises extremely quickly, it has become possible to significantly increase thermal efficiency, which was considered difficult with indirect heating methods.

In addition, the shape of the protective frame that houses the heater and pot is as in the present invention, and in particular, the material of the protective frame is an aluminum/zinc alloy plated steel plate that has excellent reflection efficiency and can reflect diffusely and uniformize heat. By doing so, the thermal efficiency of the heater can be greatly improved, and the heat of the heater can be uniformly supplied to the entire pot, so that the rice cooking performance can be improved with less uneven cooking than in the past.

Embodiment FIG. 1 is a partially sectional view of the rice cooker of the present invention, FIG. 2 is a partially cutaway plan view of the heater of the rice cooker of the present invention, and FIG. 3 is a perspective view of the protective cover.

In the figure, reference numeral 1 denotes a substantially bottomed cylindrical main body with an open upper surface, and a protective frame 3 made of an aluminum-zinc alloy plated steel plate and substantially bottomed cylindrical shape serves as a pot storage space inside this with a heat insulating material 2 interposed therebetween. The outer periphery of the upper end of the protective frame 3 is fitted into the annular upper frame 4 made of heat-resistant plastic, which is fitted around the inner periphery of the upper end of the main body 1 . The upper frame 4 has a protrusion 4
-1 and is supported by the upper part of the main body 1.

Reference numeral 5 denotes a pot in which seven flange 6 is formed on the upper opening line, which points outward. It is located in

Further, the outer peripheral surface of the pot 5 is coated with black ceramic.

Reference numeral 7 denotes a heater bent into a circular shape.The heater 7 is covered with a protective cover 8 having punched holes, and is further supported by an insulator 9.

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

In addition, on the surface of 7a, a mixture with alumina containing a large amount of zircon is used as a far-infrared radiating material, and one of metal alkoxide
A corrosion-resistant coating 7d is formed using a hydrolysis product of methylsilicate alkoxide as a binder.

A protective cover 8 is present in the heating space between the heater 7 and the pot 5.

IO is a sensing element that detects the end temperature of rice cooking and is attached to the bottom center of the protective frame 3.

Reference numeral 11 indicates a lever 12 which is connected to the heat-sensitive element 10. A lever 12 is a microswitch which controls the energization of the heater and is turned on and off by the lever 11.

13 is a display plate attached to the main body 1.

14 is a button that is glued 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 openable and closable.

The protective cover 8 has a circular cover body 8 with an a-shaped cross section.
Annular wire part for mounting on the lower outer periphery of A, cover body 8A
It is constructed by providing ventilation holes 8F in the upper and side portions of the body in the form of punched holes or lath mesh.

Next, the operation of the rice cooker of the present invention will be explained.

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

By pressing the button 14, the lever 11 rotates, and the lever! The heat-sensitive element 1o linked to 1 operates and the rice cooking state is reached, and the micro switch 12's snow inch is turned on.
The heater 7 is energized.

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

Rice is cooked by heating the pot 5.

When all the water in the pot 5 is 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, and the electricity 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, but as mentioned above, it uses a Colts heater or a halogen heater that rises in temperature quickly, so compared to the conventional indirect heating method using a sheathed heater for high temperatures. As a result, thermal efficiency was excellent.

In addition, since the 7F1 aluminum/zinc alloy plated steel plate is used to increase reflection and uniform reflection, the entire pot is heated evenly, resulting in very little uneven cooking and improved rice cooking performance. done.

Effects of the Invention In the rice cooker of the present invention, a tungsten wire is placed in the center of a quartz tube bent into a circular shape, and the space is filled with argon gas or argon gas containing halogen gas. In addition to using a heater with both ends sealed, the surface of the quartz tube is coated with a corrosion-resistant coating that contains a mixture of zircon and alumina that has excellent far-infrared radiation properties, and uses a metal alkoxide hydrolysis product as a binder. In addition, a protective cover in the form of a punched or lath mesh is installed on or around the heater, and the pot that houses the heater and the food to be cooked is equipped with these. It is located inside a protective frame for housing, and this protective frame is made of an aluminum-zinc alloy plated steel plate that is bent into an arbitrary shape so as to reflect the heat of the heater efficiently and uniformly. As a rice cooker, it has excellent rice cooking performance and thermal efficiency.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of an embodiment of the rice cooker of the present invention, FIG. 2 is a partially cutaway plan view of the heater of the rice cooker of the present invention, and FIG. 3 is a perspective view of the protective cover of the present invention. Each is shown below. 1: Main body 2: Insulation material 3: Protective frame 4: Upper frame 5: Pot 6: 7 lunge 7: Heater 7a:
Quartz tube 7b: Tungsten wire 7c: Space 7d: Corrosion-resistant coating 8: Protective cover 9: Insulator 10: Heat-sensitive element 11 lever 12: Micro switch f13: Display board 14: Button 15: Lid/: Insulator 2: Line cutter J: 54jy tsubo 4.2I fathom Left / Plow

Claims (1)

[Claims] 1. A pot for storing rice to be cooked is removably mounted in a protective frame fixed in the main body, and a space between the bottom of the protective frame and the bottom of the pot is covered with the protective frame. A heater is installed on the bottom, with both ends sealed of a circular quartz tube filled with argon gas or argon gas containing halogen gas and with tungsten placed in the center, and placed inside a breathable protective cover. In the rice cooker 2 configured to house the heater, a corrosion-resistant coating containing a substance with excellent far-infrared radiation properties and using a hydrolysis product of metal alkoxide as a binder is formed on the surface of the quartz tube. A rice cooker 3 according to claim 1, wherein the protective cover is formed into a circular shape with a cross section, and has an annular wire portion integrally formed at the lower outer peripheral portion of the cover body and a circular plate portion at the center lower portion, and is made of quartz. The rice cooker 4 according to claim 1, wherein the cover main body is provided with an opening for leading out the pipe and has hunting-like holes in the upper and side parts of the cover main body, or is formed by processing it into a lath mesh shape. The rice cooker according to claim 1, wherein the protective frame is made of an aluminum-zinc alloy plated steel plate bent into an arbitrary shape so as to efficiently and uniformly reflect the heat of the heater.