JP3326850B2 - High frequency heating device with heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heating device with a heater.

[0002]

2. Description of the Related Art In a conventional high-frequency heating apparatus with a heater, it is necessary to have a structure for properly preventing the intake and exhaust directions of a heating chamber from being reversed when a heating source is a high frequency and a heater. However, its structure was complicated and had many problems. This will be described below with reference to the drawings.

FIG. 3 is a front sectional view of a conventional high-frequency heating device with a heater during a high-frequency heating operation. FIG. 4 is a front sectional view of a conventional high-frequency heating device with a heater during a heater heating operation.

As shown in FIG. 3, a magnetron 2 serving as high-frequency heating means is connected to the side surface of the heating chamber 1, and the object 3 to be heated is subjected to high-frequency heating by the magnetron 2 or a heater 9 provided above the heating chamber 1. Is heated by convection and radiation heating by the heat source.

FIG. 3 shows heating of an object to be heated by high frequency. Since the object to be heated 3 itself generates heat by high frequency, a large amount of steam 19 is generated from the surface of the object to be heated 3 and dew condensation on the inner wall of the heating chamber 1 is not preferable. Therefore, the air that has cooled the magnetron 2 by the cooling fan 4 is introduced into the heating chamber 1 through the air guide 5 and the intake hole of the heating chamber right side plate 1a, and the ventilation air 1
8a. The ventilation air 18a causes the steam 19
Through the exhaust hole of the left side plate 1b of the heating chamber and the exhaust guide 6, and is discharged to the atmosphere from the exhaust hole 7a of the outer box 7.

On the other hand, heating by the heat source of the heater is shown in FIG.
Shown in The heater 9 is disposed in the circulation fan chamber 8 provided above the heating chamber upper plate 1c. The circulating air 18b generated by the rotation of the circulating fan 10 is heated by the heater 9 in the circulating fan case 8, and heats the object 3 in the heating chamber 1 through the heating chamber upper plate 1c. The circulation fan 10 includes a pulley A12a, a rubber belt 13, and a pulley B12b.
And is driven by the circulation fan motor 11 via the.

At the time of heating the heater, the object to be heated is heated from the outer surface thereof and the heating speed is slower than that at the time of the high frequency heating. Therefore, the generation of steam from the object to be heated 3 is small. The cooling fan 4 is stopped so that the inside of the heating chamber 1 is kept at a high temperature without being released into the atmosphere. The circulation fan motor 11 has a self-cooling fan 14,
The cooling fan motor 11 itself and other electric parts are cooled.

[0008]

However, in this configuration, not only the cooling air 18c due to the negative pressure on the suction side of the self-cooling fan 14, but also the ventilation air 18 described in FIG.
A reverse ventilation wind 18d that follows the reverse route to the route a is generated. The adverse effects of the reverse ventilation wind 18d are as follows.

(1) Lower the temperature of the heating chamber. (2) Decrease energy efficiency.

(3) The high-temperature wind acts on the circulating fan motor and other electric parts to reduce the cooling performance and the service life.

Conventionally, in order to prevent this adverse effect, Japanese Unexamined Patent Publication No.
In JP-A-193517, a shutter is provided, and the passage of reverse ventilation air is prevented by opening and closing the shutter during high-frequency heating and heater heating.

Japanese Patent Application Laid-Open No. 62-100989 controls the rotation of a cooling fan, and lowers the number of revolutions of the cooling fan during high-frequency heating and heater heating to balance the negative pressure on the suction side of the self-cooling fan. This was to prevent the generation of reverse ventilation wind.

However, according to the conventional method, not only the components and assembly costs for the shutter and the motor rotation control become expensive, but also the space in the device and the shutter operation noise for the shutter, and noise and noise on the power supply line for the motor rotation control. There are also new issues such as distorting the voltage and current waveforms.

SUMMARY OF THE INVENTION It is a first object of the present invention to provide a high-frequency heating device with a heater which reliably and reliably prevents reverse ventilation wind.

A second object of the present invention is to provide a high-frequency heating device with a heater that prevents reverse ventilation wind by utilizing the viscosity of gas.
The purpose is.

[0016]

In order to solve the above-mentioned problems, a high-frequency heating apparatus with a heater according to the present invention comprises a heating chamber for storing an object to be heated, and a heating chamber for heating the object to be heated. The combined high-frequency heating means, the heating chamber includes an air intake hole for taking in air for ventilation and an exhaust hole for exhausting steam or the like coming out of the object to be heated, and an air intake hole for sucking air from the heating chamber; A circulating fan chamber having a circulating fan for circulating air between a blowing hole for blowing air into the heating chamber and the heating chamber, a heater disposed in the circulating fan chamber, a motor for driving the circulating fan, and the motor in comprising a self-cooling fan capable of sucking the air in the heating chamber to be driven, the than the suction hole the exhaust hole is closer to the intake hole side, air in the heating chamber flows back to the intake hole at a heater heating It was stomach configuration.

[0017]

According to the present invention, the air flows from the heating chamber to the outside of the heating chamber by sucking air from the air intake hole of the heating chamber against the flow of air flowing from the exhaust hole of the heating chamber.

[0018]

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

In the first embodiment, as shown in FIG. 1, a heater 29 and a circulation fan 30 are arranged in a circulation fan chamber 28 provided above the upper plate 21c of the heating chamber. The circulation fan 30 is driven by a circulation fan motor 31 via a pulley A 32a, a rubber belt 33, and a pulley B 32b. Circulating wind 3 generated by rotation of circulation fan 30
8b is heated by the heater 29 in the circulation fan chamber 28, and heats the object 23 in the heating chamber 21 through the heating chamber upper plate 21c. Also, the heating chamber upper plate 21c
Has a suction hole of a circulation fan chamber 28, and the suction hole of the circulation fan chamber 28
Of the heating chamber right side plate 21a due to the negative pressure generated by the rotation of the circulation fan 30.
Suppress air by sucking air from the suction hole of the heating chamber 21
8e is the one that is opposed to the reverse ventilation wind 38d. As a result, the reverse ventilation wind 3
8d can be prevented from entering the heating chamber 21.
The strength of the suppression wind 38e generally depends on the degree of proximity between the position of the intake hole of the circulation fan chamber 28 and the position of the intake hole of the heating chamber 21 on the right side plate 21a of the heating chamber. It is possible to freely set the direction and size of the wind to be generated.

Although this can be done by design, for example, a number of holes are formed in the upper plate 21c and the upper plate 21c is formed.
By providing a plate in contact with c, the position of the intake hole may be changed by moving this plate, or the position of the circulation fan may be changed. By doing so, the direction and size of the circulating air 38b can be changed depending on the object to be heated.

In the second embodiment, as shown in FIG. 2, the circulating air 38b blown out from a part of the outlet of the circulating fan chamber 28 travels substantially parallel to the right side plate 21a of the heating chamber and depends on the viscosity of the gas. The air is sucked from the air inlet of the heating chamber 21 and is made to be the deterrent wind 38e as opposed to the reverse ventilation wind 38d. Further, by adjusting the amount of the circulating wind 38b blown out from a part of the blowout hole of the circulating fan chamber 28, the direction and the size of the wind passing through the heating chamber 21 can be freely set as in the first embodiment. .

[0022]

As described above, the following effects can be obtained in the high-frequency heating apparatus with a heater according to the present invention.

(1) The energy efficiency of the heating chamber can be improved by preventing cold air from entering the heating chamber from the outside.

(2) The backflow of the hot air from the heating chamber to the machine room can be prevented, and the temperature of the circulating fan motor and other parts can be prevented from rising.

(3) The heat insulation effect can be enhanced with high productivity without using an expensive shutter and eliminating the shutter.

(4) Since no shutter is used,
It is possible to reduce noise without the space in the device or the shutter operation noise.

[Brief description of the drawings]

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

FIG. 2 is a front sectional view of a high-frequency heating device with a heater according to another embodiment of the present invention.

FIG. 3 is a front sectional view of a conventional high-frequency heating device with a heater at the time of high-frequency heating.

FIG. 4 is a front sectional view of a conventional high-frequency heating device with a heater when the heater is heated.

[Explanation of symbols]

 Reference Signs List 21 heating chamber 22 high-frequency heating means 23 object to be heated 27a exhaust hole 28 circulation fan chamber 29 heater heating means 30 circulation fan 31 motor 34 self-cooling fan 38b circulation air

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F24C 7/02 541 H05B 6/64

Claims (2)

(57) [Claims] 1. A heating chamber for accommodating an object to be heated, a high-frequency heating means coupled to the heating chamber for heating the object to be heated, and an air inlet for taking in air for ventilation in the heating chamber. A circulation fan that has an exhaust hole for exhausting steam and the like from the object to be heated, and that circulates air between the suction chamber that sucks air from the heating chamber, the air outlet that blows air into the heating chamber, and the heating chamber; A circulating fan chamber, a heater disposed in the circulating fan chamber, a motor for driving the circulating fan, and the heating chamber driven by the motor.
A high frequency with heater having a configuration in which a self-cooling fan capable of sucking air inside is provided, the suction hole is made closer to the intake hole side than the exhaust hole, and air in the heating chamber does not flow back through the intake hole when heating the heater. Heating equipment. 2. A heating chamber for accommodating an object to be heated, a high-frequency heating means coupled to the heating chamber for heating the object to be heated, and an air inlet for taking in air for ventilation in the heating chamber. A circulation fan that has an exhaust hole for exhausting steam and the like from the object to be heated, and that circulates air between the suction chamber that sucks air from the heating chamber, the air outlet that blows air into the heating chamber, and the heating chamber; A circulating fan chamber, a heater disposed in the circulating fan chamber, a motor for driving the circulating fan, and the heating chamber driven by the motor.
A self-cooling fan capable of sucking air inside the heater, increasing the circulating air volume of the air outlet near the air inlet on the side of the heating chamber, and preventing the air in the heating chamber from flowing back through the air inlet when heating the heater. Heating equipment.