JPS6158956B2 - - Google Patents

Description

Detailed Description of the Invention The present invention relates to a high-frequency heating device with a built-in electric heater, and its purpose is to improve the efficiency of the oven when using the electric heater in the transparent screen portion on the heating chamber side of the door. The aim is to achieve energy savings and energy savings.

Conventionally, when an electric heater is installed in a heating chamber, a window or the like is provided with transparent glass so that the cooking progress can be seen. The same is true for high-frequency heating equipment, and even in high-frequency heating equipment with a built-in electric heater, metal mesh, punching metal, etc. are used to prevent radio waves from leaking inside the heating chamber, and its radio wave shield (radio wave Transparent materials such as tempered glass were used to provide strength and shield heat and water vapor between the shielding screens (shielding screens). However, when using an electric heater, even if there is a metal radio wave shielding screen, the transparent screen may be heated, the door may be heated, and hot air may leak from the transparent screen to the outside. There was a need for space to provide a shield, such as making the handle a heat-resistant material or creating a gap between the handle and the door so that the handle and the handle could not touch the door. In addition, heat leaks from the equipment itself, which increases the temperature of the room where the equipment is installed and even reduces the motivation to use the equipment. Furthermore, in order to improve the quality of the finished product when using an electric heater or to shorten the cooking time, the electric heater itself must be constructed so that radiant heat is irradiated all over the plane. There was also a need to increase input.

The present invention improves the conventional drawbacks as described above,
This is intended to block the leakage of heat to the outside by a heat reflecting plate built into the door, and its configuration will be explained below based on the drawing shown as an example.

Reference numeral 1 denotes a main body of a high-frequency heating device with a built-in electric heater, and a heating chamber 2 is provided inside the main body 1. 3 is a top heater, 4 is a bottom heater, 5 is a magnetron,
Each is placed in the heating chamber 2, and the mounting table 6
Place food 7 on top and cook. At the front of the heating chamber 2, there is a door 8 which is pivotally supported so as to be openable and closable, and this door 8 is provided with a handle 9 for opening and closing. Furthermore, door 8
The detailed configuration is shown in FIG.
10 is a door exterior plate, 11 is a door back plate, and the attachment plate 12 of the door exterior plate 10 and the door back plate 11 are spot welded. A radio wave shielding screen 13 made of punched metal or metal mesh is sandwiched between the mounting plate 12 of the door back plate and the door back plate 11, and is placed between the heating chamber 2 and the center of the door exterior plate 10. Radio wave leakage from the peephole 14 of the heating chamber 2 is blocked. Door exterior plate 10 and door back plate 1
1 forms a chiyoke to prevent leakage of radio waves through the gap between the heating chamber 2, the opening peripheral front plate 15, and the door back plate 11. Door exterior plate 10 and door back plate 11
A yoke opening cover 16 is attached to the yoke opening consisting of the yoke opening, which prevents dust and the like from entering.

Next, the heat reflecting plate section as the main part of the present invention will be described. On the heating chamber 2 side of the radio wave shielding screen 13, there is an internal transparent body 17 with heat resistance such as tempered glass.
An inner rubber 18 for end face protection and holding strength is pressed and attached by the door back plate 11. Then, on the outside of the radio wave shielding screen 13, a door exterior plate 1 is provided.
A heat-resistant external transparent body 19 made of tempered glass or the like is provided in the groove portion 0. And this external transparent body 1
Metal heat reflecting plate groups 20a, 20b, 2 are placed inside the 9.
0c... are rotatably supported around fulcrums 21a, 21b, 21c.... The heat reflector group consists of a large number of elongated parallel plates that cover the entire door peephole, and the other end of each heat reflector group is made of a material such as a synthetic resin material with low dielectric loss. They are connected to the connecting rod 22 via shafts 23a, 23b, 23c, . . . , respectively. One end of this connecting rod 22 is connected at a connecting fulcrum 26 to a knob 25 having an operating knob 24 which can be operated from the outside, and the knob 25 is rotatable at a fulcrum 27. The state shown by the solid line in FIG.
0a, 20b, 20c, . . . are opened by the operation knob 24, and there is a gap between them, so that the inside of the heating chamber 2 can be seen from the outside. In addition, if you lower the knob 24 as shown by the arrow in the figure, the heat reflector group 2
0a, 20b, 20c, . . . are closed as shown by dotted lines.

Since the knob connecting rod 25, the connecting rod 22, etc. are molded from a synthetic resin material with low dielectric loss, they do not disturb the door yoke, and there is no leakage of radio waves from the knob portion 24.

By incorporating a heat reflecting plate in the door as described above, the present invention can be closed to prevent heat from coming out of the door when an electric heater is used, and the efficiency of the oven can be greatly improved. . Experimentally, an efficiency increase of 20-25% was observed.

By increasing the efficiency of ovens, it has become possible to save resources and energy by shortening cooking time, improving uneven cooking, and so on.

Incidentally, since the heat reflecting plate group is provided inside the external transparent body, there is almost no temperature rise in the external transparent body itself. In addition, since the heat is shielded by a heat reflector, there is no need to take measures against temperature rises or heat around the device, and restrictions on installation location are greatly reduced.
Able to use equipment comfortably. Therefore, there are effects such as significantly reversing the negative image of using electric heaters, creating a desire to use the equipment, and increasing the use of high-frequency heating devices with built-in electric heaters.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a high-frequency heating device with a built-in electric heater showing an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of the same, and FIG. 3 is an enlarged cross-sectional view of a main part of the present invention. 2...Heating chamber, 8...Door, 13...Radio wave shielding screen, 14...Peep window section, 20a, 20b, 20
c...Heat reflecting plate, 23...Connecting rod, 24...Operation knob portion, 25...Knob connecting rod.

Claims (1)

[Scope of Claims] 1. A group of heat reflecting plates, in which a number of elongated parallel plates are pivotally supported in a position that covers the entire viewing window and can be freely opened and closed, is built into the door in front of the opening of the heating chamber, and A high-frequency heating device with a built-in electric heater, characterized in that an operating end of a connecting part that pivotally supports the group of reflectors is provided outside the door, so that the inside of the heating chamber can be seen through when the group of reflectors is opened. 2. The high-frequency heating device with a built-in electric heater according to claim 1, wherein the heat reflecting plate is located outside the radio wave shielding screen.