JPH0835670A - Heating and cooking device - Google Patents

Abstract

PURPOSE:To provide a heating and cooking device having a heater in which a heating performance is improved through a uniform distribution of heat of an upper heater and a high safety in operation can be attained while a thermal shielding of the upper heater is being applied to get a low outer wall temperature of the device. CONSTITUTION:There are provided a fan-shaped reflection plate 11a and a fan-shaped reflection plate 11b having a substantial same size as that of a heating chamber 10 storing a heated item and an upper plate 10a at a ceiling surface of the heating chamber 10. The upper plate 10a placed at a position oppositely faced against the reflection plate is provided with many opening holes. A heater cover 11 having a glass tube heater 12 installed in the reflection plates 11a and 11b is fastened to end surfaces of the upper plate with small screws and then the upper part of the heat cover 11 is provided with an inner thermal insulating plate and an outer heat shielding plate 18 having double air heat insulating layers 13, 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker such as an electric oven or a microwave oven with a heater which heats an object to be heated housed in a heating chamber by the heat of the heater.

[0002]

2. Description of the Related Art Generally, in a microwave oven with a heater, a heating method using a heater is mainly used, and an upper and lower heater method is mainly used in which planar heaters are provided on the top and bottom surfaces of a heating chamber mainly utilizing radiation of heat and natural convection. However, in recent years, it has been desired to improve the cooking speed and to enhance the taste and to enhance the color of the tea. Therefore, the equipment using radiant heat using a glass tube heater on the top surface has become mainstream.

FIG. 4 is a top view showing a conventional upper and lower heater type heating cooker using a glass tube heater, and FIG. 5 is a partial side sectional view.

In FIGS. 4 and 5, two glass tube heaters 2 are shown in the upper part of a heating chamber 1, and a lower heater (not shown) is shown in the lower part of the heating chamber 1. The glass tube heaters have heater covers 3 and 4 each having a reflection plate. Each of the heater covers is mounted inside and is welded to the upper plate 5 constituted by the upper surface of the heating chamber 1 at the hatched portion shown in the drawing. A heat insulating material 5 is arranged so as to cover the upper surface of the heater cover, a heat insulating plate 6 is attached so as to fix and cover the heat insulating material, and a body 7 is fixed with a gap.

[0005]

However, in the above-mentioned conventional structure, since the heater covers 3 and 4 are welded to the upper plate 5, part of the heat from the tube heater 2 is reflected on the heater cover 1 and the heating chamber 1 is heated. Since most of them are directly radiated directly along the diameter of the glass tube, the amount of heat in the A part in the center of the figure and the B parts and C parts of the end face becomes weak and the heat distribution to the heated object in the warehouse It became worse and partially burnt and boiled, resulting in poor cooking finish. Since the heater is in the heating chamber, there is a problem such as breaking the glass tube during cleaning. Further, since the heat capacity of the upper heat insulating material is small and the heat insulating effect of the heat insulating plate is small, there is a problem that the body becomes hot and the body is burned and the ornament is thermally deformed.

The present invention solves the above problems and provides a heating cooker which has excellent heat distribution, is easy to use by cleaning the inside of the heating chamber, has good heating performance, and has a low outer wall temperature of the device and high safety. This is the purpose.

[0007]

The cooking device according to the present invention comprises:
Outside the ceiling surface of the heating chamber, a heater cover is arranged so as to cover almost the entire area, a reflector plate is formed in the heater cover, a tube heater is attached, and two heat insulating plates are used above the heater cover. It is intended to form a double air heat insulation layer and to obtain uniform temperature and reliable heat shielding of the upper plate of the heating chamber ceiling surface.

[0008]

According to this operation, the tube heater forms a heater cover by forming a reflector plate on the outside of the ceiling surface of the heating chamber with a size substantially equal to the upper plate constituting the ceiling surface. The opening hole is opened so as to face the relative position with the reflection plate, the upper plate and the heater cover are brought into surface contact with each other, and the left and right flanges of the upper plate are screwed. At this time, a part of the heat of the tube heater is reflected by the reflecting plate and tries to enter the heating chamber, but a part of the radiant heat is conducted to the upper plate because there are many opening holes in the upper plate. Also, since the heater cover is almost the same size as the upper plate, the conduction heat from the tube heater is propagated to every corner of the periphery, and the temperature distribution in the heating chamber is uniform due to the synergistic effect with the conduction heat of the upper plate described above. Be converted. Further, since the radiant heat from the opening holes is also dispersed, local heat concentration on the object to be heated is reduced, uneven heat distribution is improved, and a good cooking finish can be obtained. In addition, the heater cover is the same size as the upper plate, and the heat is evenly distributed, and part of the heat is released into the heating chamber, and the rest is transferred to the upper part, but there is no locally high temperature range, and the temperature decreases and the upper part With the double air insulation layer provided, heat is shielded to reduce the temperature of the body outside the equipment, prevent burns and thermal deformation of the figurine, and eliminate the heater exposed in the heating chamber, and cleaning is also possible. It can also be made easier and easier to use.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A heating cooker according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view showing the structure of a heating cooker according to the present invention, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is a top view. Outside the upper plate 10a of the ceiling surface forming the heating chamber 10, the reflectors 11a, 1 having the same size as the upper plate 10a are provided.
A glass tube heater 12 in which a heater cover 11 provided with 1b is arranged, and a nichrome wire is arranged inside each of the space portions of the reflection plate.
It is attached by penetrating. An inner heat insulating plate A14 is provided above the heater cover 11 via an air heat insulating layer A13 along the shape of the reflection plates 11a and 11b, and an oven lamp 15 for illuminating the heating chamber is provided between the reflection plates and the upper plate 10a and the heater cover 11 are provided. It is provided on the lamp glass 16 interposed between. The upper surface of the inner heat insulating plate A14 is covered with an outer heat insulating plate B18 via an air heat insulating layer B17. A body 20 constituting an outer shell of the heating cooker is attached to the upper portion of the outer heat insulating plate B18 via a space 19. The inner heat insulating plate A14 and the outer heat insulating plate B18 are fastened to the heater cover 11 with screws 21 by utilizing the recesses provided in a part thereof. The heater cover 11 is the upper plate 10
Screws are fastened by the flanges provided on the left and right of a.
The upper plate 10a is the reflection plate 1 of the upper heater cover 11.
A large number of opening holes 2 are provided at positions facing the space portions of 1a and 11b.
2 (the drawing shows only the peripheral surface of the opening).
Reference numeral 23 is an opening for irradiating light from the lamp.
Further, on the lower surface of the heating chamber 10, a planar heater 24 is provided in close contact with the outer surface, is fixed by a fixing plate 25 for mounting the heater, and a heat insulating material 26 for radiating heat is arranged inside. . 27 is a door that can be opened and closed in the front of the heating chamber 10. Reference numeral 28 is a side wave tube that forms a path for radio waves in the microwave oven, and 29 is a magnetron for high frequency heating.

In the above structure, the upper glass tube heater 12 and the planar heater 24 arranged on the lower surface are heated in sequence, and in the process of cooking the object to be heated in the heating chamber 10, the nichrome of the glass tube heater 12 is heated. The surface of the glass tube is red-heated by the red heat of the wire, and as radiation heat, a part of the heat is reflected by the reflection plates 11a and 11b of the heater cover 11 and radiated into the heating chamber 10. Although it is dissipated (solid line arrow), it is diffusely reflected in multiple directions by the large number of opening holes 22 provided in the upper plate 10a as shown by the broken line arrow in the figure, and is not locally concentrated, and the heat quantity is dispersed from the opening hole 22. While pouring down. Here, since the heater cover 11 is configured to have substantially the same size as the upper plate 10a, part of the amount of heat received as radiant heat is reflected, and part of the amount of heat absorbed is absorbed as heat conduction to the heater cover 11 as heat conduction. Are uniformly heated, and the heat is transmitted to the heating chamber 10.
Therefore, the amount of heat is spread to the vicinity of the central portion other than the reflector and the four corners. Further, sending the amount of radiation directly through the opening 22 of the upper plate 10a means that heat is applied to the upper plate 10a, which also makes the heat of the upper plate 10a uniform. Since the heat distribution from above the heating chamber 10 can be improved as compared with the conventional case, the heat absorption to the food to be cooked can be made uniform and a stable heat distribution with good heat efficiency can be obtained.

In addition, at the time of the above-mentioned heating, the heat efficiency of the heating chamber 10 is improved and the temperature rising speed in the chamber is improved by suppressing the heat escaping to the upper side of the heater cover 11 as opposed to the heat to the heating chamber 10 side. Heater cover 1
1 through the air insulation layer A13, the inner insulation plate A14
To the upper part of the outer heat insulating plate B1 through the air heat insulating layer B17.
By fastening 8 to the heater cover 11 with the screws 21, the heat of high temperature is hindered from being propagated by the two air layers. Therefore, the temperature of the body 20 can be reduced.

With the heat insulation of the air, the heater cover 1
1 also contributes to making the temperature uniform, and is effective in improving the heat distribution in the heating chamber 10.

Although the glass tube heater is used in this embodiment, the present invention is not limited to this, and a tube heater such as a sheath heater may be used.

[0015]

As described above, according to the heating cooker of the present invention, the following effects can be obtained. (1) In order to obtain a good heat distribution by utilizing the radiant heat of the tube heater, it is necessary to disperse the radiant heat by avoiding local concentration and to make the entire upper surface of the heating chamber a uniform temperature. By constructing a heater cover that is approximately the same size as the upper plate of the heating chamber and has a separate reflection plate on the outside, heat is efficiently conducted to the entire upper plate and heater cover, eliminating localized heating. , A uniform heat distribution without heating unevenness is obtained, and cooking performance is improved. (2) Similarly, due to the double structure of the upper plate and the heater cover, the heat capacity increases and the heat does not easily escape, so there is a margin in the amount of heat to be heated, the cooking time can be shortened, and cooking with excellent thermal efficiency can be realized. (3) The upper tube heater is housed inside through the opening in the upper plate, and the heating chamber has a clean shape without any extra protrusions, which is a convenient and easy-to-use heating cooker. (4) By forming a double air heat insulation layer on the upper part of the heater cover, the heat escaping to the upper part is reduced and the local heating is eliminated, so that the body temperature is uniform and the temperature at which the resin of the burn or the figurine is deformed is maintained. It is possible to realize a heating cooker that has a lower temperature than the range and is excellent in safety without danger.

[Brief description of drawings]

FIG. 1 is a side sectional view of a heating cooker according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the heating cooker.

FIG. 3 is a top view of the heating cooker.

FIG. 4 is a top view of a conventional heating cooker.

FIG. 5 is a side sectional view of the main part of the heating cooker.

[Explanation of symbols]

 10 Heating Chamber 10a Upper Plate 11 Heater Covers 11a, 11b Reflector 12 Glass Tube Heater 13 Air Insulation Layer A 14 Inner Insulation Plate A 17 Air Insulation Layer B 18 Outer Insulation Plate B

Claims (1)

[Claims] 1. A heating chamber for containing an object to be heated and a glass tube heater for heating the object to be heated, wherein the glass tube heater is provided on the outer wall surface of a heating chamber upper plate constituting the heating chamber. The heater cover, which has a reflection plate of approximately the same size as the upper plate, is held and brought into close contact, and an inner heat insulating plate is arranged above the heater cover via an air layer, and an air layer is formed above the inner heat insulating plate. A cooking device with an external heat insulation plate.