WO1981003536A1

WO1981003536A1 - Heat cooking oven

Info

Publication number: WO1981003536A1
Application number: PCT/JP1981/000126
Authority: WO
Inventors: M Akiyoshi
Original assignee: Matsushita Electric Ind Co Ltd; M Akiyoshi
Priority date: 1980-06-04
Filing date: 1981-06-03
Publication date: 1981-12-10
Also published as: AU7226681A; EP0053189A1; EP0053189A4

Abstract

A heat cooking oven for heating the atmosphere in a heating chamber (5) by an electric heater to a high temperature for cooking food. The electric heater has a heating element (1) in a container (3) and the lead part (11) of a lead wire (2) as sealed at the container in such a manner that the lead part (11) is disposed within the chamber (5) and is projected out of the chamber (5). Since the element (1) is sealed in the container (3), it can be prevented from oxidizing and can heat at high temperature, thereby accelerating the cooking speed. Since the sealed lead part (11) is cooled by the outer atmosphere and retained at a low temperature, this invention can prevent damage to the lead wire due to the difference of thermal expansion coefficients between the container (3) and the lead wire (2) and can prolong its lifetime.

Description

. Specification

Title of invention

Cooker

Technical field

(5) The present invention relates to a heating cooker that heats and cooks by increasing the ambient temperature in a heating chamber, in which the cooking speed is fast, energy is saved, and the life of the heating element is long.

Background art

, ο Conventional heating cookers that control the heating temperature by raising the ambient temperature in the heating chamber with an electric heater include a sheathed heater as the electric heater and a heater coil built into a heat-resistant insulator such as a quartz tube. Only a so-called quartz tube heater was used. However, in both cases, the heat-generating part is exposed to the air.

1 5] It was damaged, so this heating part could only be heated to the following temperature in 1 OO〇. For this reason, the atmosphere temperature in the heating chamber does not become high or low, the radiant heat is weak, the cooking speed of food is slow, and energy loss is large.

0 Disclosure of the Invention

Thus, the present invention provides a cooking device that has a fast cooking speed and energy savings, and has a long heating element life.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

5 Brief Description of Drawings '' • FIG. 1 is a front view of a cooking device showing one embodiment of the present invention, FIG. 2 is a front sectional view of the cooking device, FIG. 3 is a sectional view of a main part of the cooking device, FIG. FIG. 5 is a sectional view of a main part of an assisting cooker according to another embodiment of the present invention, and FIG. 5 is a perspective view of a main part of FIG.

5 BEST MODE FOR CARRYING OUT THE INVENTION

1 to 5, lead wires 2 such as molybdenum are provided at both ends of a filament 1 made of a high melting point material such as tungsten used as a heating element. The filament 1 and the lead wire 2 are placed inside a container 3 made of a heat-resistant insulator such as quartz or crystallized glass or a horizontal elongated tube made of lO. It is stored. Also from opposite ends of the container 3 at one end of the lead line 2 is pull out to the outer container 3, the pulling out and part 1 ¹ by reducing deformation of the container 3, taking the sealing structure in the container 3.

^, Lead 容器⁴ is attached to the lead wire 2 outside the container 3

1 5 Connected. After evacuating the air into the container 3, an inert gas such as argon gas is sealed therein to prevent the filament 1 from being oxidized. The heating chamber 5 is divided into a main heating chamber for storing food ⁶ and a sub-heating chamber 8 for storing the container 3 by a partition net ^{5 /} ], and the partition net ^{5 /} transmits infrared rays. However, it has a net-like shape with a large number of holes having a size of 0 enough to block high-frequency electromagnetic waves. Further, since the partition screen ^{5 /} is close to the container 3 and strongly receives radiant heat from the filament 1, thermal expansion occurs sharply. In particular, repetition of expansion and contraction due to heating and stopping of Filament 1 causes local deformation, and in the case of a long-term inversion, a breakage accident may occur.

5 If the partition net ^{5 /} was broken, it was used as an example of a high-frequency oscillator.

OMPI WIPO The high-frequency electromagnetic wave supplied from the magnetron 9 to the main heating chamber a penetrates into the sub-heating chamber 8, and the filament ¹ breaks the spark! ), Which causes a very serious problem that high-frequency electromagnetic waves leak out to the outside of the heating chamber 5.

Therefore, in the present embodiment, the sub-heating chamber 8 and the main heating chamber are separated from each other.

-It is bent in a wavy shape. That is, the partition net 5 'is a filament 1

L Thermal expansion occurs and the both ends are fixed to both walls of the main heating chamber ⁵ , so that a bending stress is applied to the partition net ^{5 /.} And the deformation at each bend can be kept very small.

^There was no break of ⁵ ', and [9], filament 1 was disconnected by spark, and high-frequency electromagnetic wave was not leaked. Also, holes are formed in both walls of the sub-heating chamber 8 so that both ends of the container 3 can be penetrated.

8A is provided, and the lead-out portions 11 of the lead wires 2 at both ends of the container 3 protrude out of the heating chamber 5 through the hole 8A. The diameter of the hole 8A is larger than the outer diameter of the container 3 with a margin. The magnetron 9 and the main heating chamber are connected by a waveguide 10 O.

In the above configuration, the food 6 in the main heating chamber 7 is first subjected to dielectric heating from the inside by high-frequency electromagnetic waves supplied from the magnetron 9, and then the lead wire 4 and the lead 2 are drawn out. Immediately when the current is applied to Filament 1 through the interface, the surface heats up immediately, and the surface can be scorched in a short time by the radiant heat from Filament 1.

By the way, as mentioned above, the temperature of filament 1 is more than 150

OMPI

/., V / IPO. _Λ Because of the high temperature of the container 3, the temperature of the container 3 is about 900 and higher.], And the upper surface of the sub-heating chamber 8 and the partition net ^{5 /} are ⁵ ° C or more.

The major problem here is that, due to the difference in the thermal expansion coefficient between the container ³ and the lead wire 2, if the lead portion 11 of the container 3 that is the contact portion between the two becomes hot, breakage occurs and the external air Infiltration into the container 3 內 and the filament 1 is oxidized. According to this embodiment, the drawer 11 protrudes out of the sub-heating chamber 8. since, this argument out section 1 1 is cooled by the outside air, it is clauses that damage so keep at a low temperature, was Tsu take off I La e n t "! of long life. in addition, the above-mentioned pull out Shi line ² Due to the generation of heat, the temperature in the vicinity was relatively low, and the insulation distance from the wall of the sub-heating chamber 8 was not sufficiently long, but the insulation properties of the container 3 were satisfactory.

Quartz or crystallized glass, which is the material for the container 3, hardly undergoes thermal expansion even at a high temperature of 1 OOO'C, but stainless steel and the like generally used for the walls of the sub-heating chamber ⁸ etc. The metal plate has a large thermal expansion even at about 5 OO ° C. Therefore, in the present embodiment, in consideration of such characteristics, as described above, holes 8A are provided in both side walls of the sub-heating chamber 8, and the width of the sub-heating chamber 8 is reduced because the container 3 is penetrated and held. Even if the temperature changes, no excessive force is applied to the container 3 and the container 3 is not damaged.

Also, as shown in FIG. 3, both ends of the container 3 penetrate the double wall of the heat insulating plate 12 and the second heat insulating plate 13 made of the first metal material, respectively. Further, a heat insulating elastic body 14 for holding the container 3 is provided between the heat insulating plates 1 and ¹³ . Further, the dimension between the first heat insulating plate 12 and the second heat insulating plate 13 is increased.

OMFI WIPO Wavelength of high-frequency electromagnetic waves in heat chamber 5! It is almost ほぼ of 1 and this portion forms the high impedance part in high frequency electromagnetic waves. That is, even if the high-frequency electromagnetic wave enters the sub-heating chamber S without being able to completely block the partition net ⁵ ? / ₄ two insulation board 1 2 with a spacing of 1 ³ selected Saegihei to prevent Moikada to the secondary heating chamber 8 outer, is also enhance safety. In addition, the two heat insulating plates 12 and 13 do not leak the hot air in the sub-heating chamber 8 or the main heating chamber a to the outside of the heating chamber 5 and are cut off together with the elastic body 14 to enhance the heat effect. As a result, the heating efficiency of the food 6 is further enhanced, and the result is that the food can be cooked more speedily. Oil smoke and food waste generated from the food 6 were also prevented from entering the machine room that houses the magnetron 9 and the like, and malfunctions such as poor insulation were eliminated.

As shown in Fig. 4, if a cylindrical metal pipe 12A is provided in the container 3 between the two insulating plates 12 and 3 described above, a complete ⁴ choke structure is formed. The effect of preventing the leakage of high-frequency electromagnetic waves can be enhanced.

てお Is the front opening of the heating chamber 5 open and closed by the door 15? Further, the heating chamber 5 is housed in the main body case 16.

Industrial applicability

As described above, according to the present invention, since the heating element is sealed in the container, the heating element is not oxidized. Therefore, the temperature of the heating element is extremely high, and the ambient temperature in the heating chamber is rapidly increased. The cooking speed can be made extremely fast, and the energy can be saved accordingly.

O PI

iS ^ — Ό — Also, since the lead-out part of the lead wire outside the container protrudes out of the heating chamber, it is unlikely that the lead-out part of this container is damaged and air enters the container. Therefore, the heating element does not oxidize and its life is extremely long.

OMPI WIPO

Claims

The scope of the claims

1. A heating chamber for storing food, a sealed container provided in the heating chamber, a heating element provided in the container, and a heating element, and the end is drawn out of the container. A heating cooker comprising: a drawn-out lead wire, wherein a lead-out part of the lead-out line of the container projects outside the heating chamber. -

2. A heating cooker according to claim 1, wherein the container is formed of a horizontally long straight pipe, and a lead wire is drawn out from both ends of the straight pipe.

3. The heating cooker according to claim 2, wherein the straight pipe protruding outside the heating chamber is supported by an elastic body.

4. The cooking device according to claim 1, wherein a high-frequency oscillator for supplying high-frequency electromagnetic waves is provided in the heating chamber.

5. In Claim 4, the heating chamber is divided into a main heating chamber to which high-frequency electromagnetic waves are supplied by a partition net and a sub-heating chamber in which a container is provided! ) 、 The heating cooker is characterized by having a plurality of holes in the bracket net that are large enough to transmit infrared rays and block high-frequency electromagnetic waves.

6. A cooking device according to claim 5, wherein the mesh side of the partition net is bent.

In Claim 4, the container is constituted by a straight pipe having a length of 橫 ', and the straight pipe penetrates through a double heat insulating plate so as to protrude out of the heating chamber, and has a double heat insulating property. A heating cooker characterized by having a dimension between the plates that is ¾ of the wavelength of the high-frequency electromagnetic waves in the heating chamber.

8-In claim a, the end of the straight pipe is supported between the insulating plates A heating cooker characterized by having an elastic body to be provided. .

9. The cooking method according to claim ⁴ , wherein the container is constituted by a horizontally long straight pipe, and a choke structure is provided at a protruding portion of the straight pipe outside the heating chamber. vessel.

OMPI WIPO