JP2001248842A - High frequency heating equipment - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In a high frequency heating device, powder from a reflecting portion falls into a heating chamber due to vibration when opening and closing a door. SOLUTION: Since a heat-resistant partition plate 14 is provided, it is possible to prevent powder from falling from a reflecting portion 16 of an upper heater 15. The heat-resistant partition plate 14 is formed by processing ceramic into a paper shape. Because it is paper-shaped, it is flexible in processing and assembly, and has good mass productivity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device such as a microwave oven.

[0002]

2. Description of the Related Art FIG.
There was something like that shown. In FIG. 4, a door 2 is provided on a front surface of the heating chamber 1, and heaters are arranged on upper and lower wall surfaces of the heating chamber 1. The upper heater 3 has a metal part 4, a reflection part 5,
The heating element 6 and the insulator 7 are formed in a planar shape. The upper heater 3 is attached to the oven upper plate 9 so as to radiate the heat of the upper heater 3 to the food 8 in the heating chamber 1. The oven upper plate 9 where the upper heater 3 is attached is in an open state. The heat emitted from the upper heater 3 is released to the heating chamber 1 and heats the food 8 placed on the turntable 10.

[0003]

However, in the above-described conventional configuration, the heat generated at the time of the heater cooking is reduced by the heating chamber 1.
And the food 8 placed on the turntable 10 is heated. The oven upper plate 9 where the upper heater is attached is in an open state.

[0004] The reflecting portion 5 is made of fumed silica having an ultrafine porous structure. Therefore, there is a problem that the powder from the reflecting portion 5 falls into the heating chamber 1 due to vibration or the like when the door 2 is opened and closed.

[0005]

In order to solve the above-mentioned problems, the present invention provides a heating chamber for accommodating an object to be heated, a heating element provided outside the heating chamber and heating the object to be heated, A reflecting portion made of fumed silica having a porous structure and reflecting heat of the heating element, a metal cover for fixing the periphery of the reflecting portion, and insulation for securing insulation between the reflecting portion and the metal cover. A heat-resistant partition plate is provided on the surface of the heating chamber located between the object and the heating element and the side of the object to be heated.

According to the above invention, the heat generated during the heater cooking is released to the heating chamber to heat the food placed on the turntable. By inserting a heat-resistant partition plate between the reflecting portion of the upper heater and the upper surface of the heating chamber, it is possible to prevent powder from falling from the fumed silica having an ultrafine porous structure due to vibrations such as opening and closing the door.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A high-frequency heating apparatus according to a first aspect of the present invention includes a heating chamber for accommodating an object to be heated, a heating element provided outside the heating chamber and heating the object to be heated, A reflecting portion made of fumed silica having a porous structure and reflecting heat of the heating element, a metal cover for fixing the periphery of the reflecting portion, and insulation for securing insulation between the reflecting portion and the metal cover. A heat-resistant partition plate is provided on the surface of the heating chamber located between the object and the heating element and the side of the object to be heated.

The heat-resistant partition plate is provided to prevent powder of fumed silica from dropping. The heat-resistant partition plate is inserted between the reflecting portion of the upper heater and the upper surface of the heating chamber to prevent vibration such as door opening and closing. It becomes possible to prevent powder from falling from fumed silica having an ultrafine porous structure.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a schematic sectional view showing a high-frequency heating device according to an embodiment of the present invention, FIG. 2 is a plan view of an upper heater of the high-frequency heating device, and FIG. It is aa 'sectional drawing of.

In FIG. 1 to FIG. 3, a door 12 is provided on the front surface of the heating chamber 11 so as to be substantially sealed. In the embodiment of the present invention, the example in which the heating elements (heaters) are arranged on the upper and lower two walls of the heating chamber is shown. It goes without saying that there is no such thing. Upper and lower 2 of heating chamber 11
A heater is arranged on a wall surface. The oven upper plate 13 of the heating chamber 11 is in an open state, and an upper heater 15 is installed thereon. The upper heater 15 has a reflecting portion 16,
The reflector 16 is composed of a heating element 17, an insulator 18, a metal cover 19, and a heat-resistant partition plate 14, and the reflection section 16 is a compression molded body of fumed silica. In addition, fumed silica has an extremely fine cell structure.

Further, since the composition contains an impermeable agent such as a heat-resistant metal oxide so that the transmission of infrared rays is at a minimum level, the infrared rays are effectively scattered. 90% or more, the same level as metal,
It has high heat insulation and high reflectivity.
However, fumed silica has an extremely fine cell structure, and innumerable gaps are opened between the fine particles bonded to each other, and if water enters the gaps,
Since the insulation resistance is deteriorated and the heat resistance metal oxide or the like is mixed into the reflection part to further promote the deterioration of the insulation resistance, an insulator 18 is inserted between the reflection part 16 and the metal cover 19 to secure the insulation. . The insulator 18 secures insulation with mica, a super heat-resistant resin, a mullite-based insulator, or the like.

In the embodiment of the present invention, the above three types of insulators are exemplified. However, it goes without saying that any insulator may be used as long as it satisfies the installation conditions (heat resistance, humidity resistance, mass production assemblage, etc.). That is. Further, the strength is not strong, and when an external impact or the like is applied, fine powder is peeled off. For this reason, the heat-resistant partition plate 14 is provided to prevent the powder from falling.

The heat-resistant partition plate 14 is formed by processing ceramic into a paper shape. Since it is in the form of paper, it is flexible in processing and assembling, so that it has good mass productivity. Further, the thinner the thickness, the better the heat permeability, and the best is t = 0.5 or 0.25 mm. However, it is necessary to protect the heat-resistant partition plate 14 because it is weak against an external impact. The heat-resistant partition plate 14 can be protected by providing a configuration in which a punching hole is provided in the oven upper plate 13 at the upper heater 15 or a configuration in which metal plating is provided on the heating chamber side from the heat-resistant partition plate 14. I can do it. In addition, the punching holes and the metal mesh also serve to prevent radio waves emitted during microwave cooking from leaking out of the heating chamber. Thereby, generation of noise can be minimized.

The heating element 17 is a ribbon-shaped Fe-Cr-Al material having a width of 5.25 mm. As shown in FIG. 3, it is formed into a corrugated shape, and is housed in a metal cover 19 integrally with the reflecting portion 16. In the present embodiment, the thickness of the heating element 17 is 50 μm, and the power consumption is 100 v750.
w. As shown in FIG. 3, the heating element 17 includes an exposed portion 17a protruding from the surface of the reflecting portion 16 and a buried portion 17b, and is fixed to the reflecting portion 16 by the buried portion 17b.

A lower heater 21 is provided below the bottom plate 20 of the oven. Lower heater 21 is also upper heater 1
5 is composed of a reflector 22, a heating element 23, an insulator 24, and a metal cover 25, which are attached to the oven bottom plate 20. The oven bottom plate 20 is heated by the heat generated by the lower heater 21 and transmitted to the food 27 on the turntable 26 in the heating chamber 11 by radiation and convection.

The lower heater 21 also has a configuration in which a heating element 23 is partially exposed on the surface of the reflection section 22 and the other is buried. The lower heater 21 has a width of 2.25 mm, a thickness of 50 μm, a ribbon-like waveform, and a material of the same composition. You are using Power consumption is 100v480w
And

Next, the operation and operation will be described. The food 27 in the heating chamber 11 is cooked by the heat from the upper heater 15 and the lower heater 21. At this time, the heating elements 17.2
Since 3 is a ribbon-shaped thin plate and is partially exposed from the reflecting portions 16 and 22, the radiation of heat is good, and it becomes a red heat state within 2 to 3 seconds after energization and reaches a predetermined temperature of the heater.

The reflection portions 16 and 22 are made of fumed silica having a thermal conductivity smaller than that of still air and a reflectance of infrared rays as large as 0.90 or more and excellent in high radiation heat shielding property. This makes it difficult for heat from the heater portion to escape to the outside, speeds up the rise of the internal temperature, and allows the applied energy to be used efficiently for cooking.

It should be noted that the thickness and width of the heater wire are not limited to the numerical values of the embodiment, but can be arbitrarily selected. The material of the heater is heat-resistant and can be selected from those having no problem in moldability and durability, and the shape is not limited to a waveform.

Since fumed silica is a combination of fine particles having an extremely fine cell structure and is weak against external impacts, etc., the fumed silica powdered is heated by the heat-resistant partition plate 14. It is prevented from falling into the chamber 11.

Embodiment 2 Embodiment 2 differs from Embodiment 1 in that heat-resistant glass is used for the heat-resistant partition plate 14.

The heat-resistant glass is made of neoceram glass or quartz glass. Since the heat-resistant glass is transparent and has a small thickness, the heat and light of the heating element 17 can easily pass through the heat-resistant glass, thereby improving the heating characteristics.

The components having the same reference numerals as in the first embodiment have the same structure, and the description is omitted.

Next, the operation and operation will be described with reference to FIGS. The heat-resistant partition plate 14 is made of heat-resistant glass to prevent powder from falling from fumed silica.

The heat-resistant glass improves the confidentiality of the metal cover 19 and the heat-resistant partition plate 14, thereby suppressing the hygroscopicity of the reflecting portion 16. Eliminating the entry of humidity can prevent insulation resistance from deteriorating. Therefore, the insulation resistor 18 can be eliminated.

In order to protect the heat-resistant partition plate 14, the heat-resistant partition plate 14 is provided by providing a punching hole in the upper oven plate 13 or by providing a metal mesh on the heating chamber side of the heat-resistant partition plate 14. Can be protected. In addition, the punching holes and the metal mesh also serve to prevent radio waves emitted during microwave cooking from leaking out of the heating chamber. Thereby, generation of noise can be minimized.

Embodiment 3 Embodiment 3 is different from Embodiments 1 and 2 in that a glass fiber fabric is used for the heat-resistant partition plate 14. In this embodiment, a woven fabric having a tight clog is used.

The components having the same reference numerals as in the first embodiment have the same structure, and the description is omitted.

Next, the operation and operation will be described with reference to FIGS. The heat-resistant partition plate 14 is made of clogged glass fibers to prevent powder from falling from fumed silica.

Since fumed silica is a fine particle, if the weave of the glass fiber woven fabric is slightly open, it cannot be used because it cannot prevent powder falling.

In order to protect the heat-resistant partition plate 14, a punching hole is provided in the upper oven plate 13 or a metal mesh is provided on the heating chamber side of the heat-resistant partition plate 14 so that the heat-resistant partition plate 14 is formed. Can be protected. In addition, the punching holes and the metal mesh also serve to prevent radio waves emitted during microwave cooking from leaking out of the heating chamber. Thereby, generation of noise can be minimized.

[0033]

As described above, the high-frequency heating apparatus of the present invention uses a fumed silica molded body having an ultrafine porous structure excellent in heat reflectivity and heat insulation performance as a reflecting portion.
Since the ribbon-shaped thin plate heating element is formed into a corrugated shape, a part thereof is exposed and buried in the reflecting portion, and is fixed and integrated, the heat insulating layer becomes slim. Further, an insulator is inserted between the reflector and the metal cover so that the insulation is not deteriorated even in a high humidity environment. By providing a heat-resistant partition plate of ceramic paper between the upper heater and the oven upper plate, the fumed silica, which has an extremely fine cell structure, is a combination of fine particles and fine particles and is weak against external impact. There is an effect that the powder can be prevented from falling.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a high-frequency heating device according to a first embodiment of the present invention.

FIG. 2 is a plan view of an upper heater of the high-frequency heating device.

FIG. 3 is a sectional view of the upper heater of the high-frequency heating device taken along the line aa '.

FIG. 4 is a schematic sectional view showing the configuration of a conventional high-frequency heating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Heating chamber 12 Door 13 Oven upper plate 14 Heat-resistant partition plate 15 Upper heater 16 Reflector 17 Heating element 18 Insulator 19 Metal cover 20 Oven lower plate 21 Lower heater 22 Reflector 23 Heating element 24 Insulator 25 Metal cover 26 Turntable 27 Food

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3K034 AA03 AA08 AA12 AA22 BA01 BA11 BB20 BC12 FA02 FA29 GA02 GA03 GA10 3L086 AA02 BD07 DA18 DA19

Claims (1)

[Claims] 1. A heating chamber for accommodating an object to be heated, a heating element provided outside the heating chamber and heating the object to be heated, and a fumed silica having an ultrafine porous structure, the heat of the heating element A metal cover for fixing the periphery of the reflector, an insulator for securing insulation between the reflector and the metal cover, and a gap between the heating element and the object to be heated. A high-frequency heating apparatus, wherein a heat-resistant partition plate is provided on the surface of the heating chamber located at the position (1).