JPH0142589B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a high-frequency heating device that uses high-frequency waves to heat and cook foods, etc. The present invention relates to a high-frequency heating device that uses high-frequency waves to heat and cook foods, etc., and includes a mounting structure for a waveguide that guides high-frequency waves into a heating chamber and a magnetron that is a high-frequency oscillator. Concerning an improved version of .

Structure of a conventional example and its problems FIG. 1 is a cross-sectional view showing a conventional high-frequency heating device.

In FIG. 1, in the conventional high-frequency heating device, a waveguide 3 that guides the high-frequency waves irradiated from the magnetron 2 into the heating chamber 1 is installed on the outside of the upper wall of the heating chamber 1, and the high-frequency waves are irradiated into the heating chamber 1. A power supply port 6 is provided on the upper wall of the heating chamber.

The magnetron 2 is attached to the lower wall of the waveguide 3, and the high frequency waves irradiated from the magnetron pass through the waveguide 3 and are irradiated from the power supply port 6 to the food placed in the heating chamber 1, heating it. I'm starting to do that. Furthermore, since the magnetron 2 becomes very hot when generating high frequency waves, a cooling fan 8 is provided to cool it down.
also serves to cool electrical components such as the high-voltage transformer 7 that generates the high-voltage power sent to the magnetron 2. Therefore, in this configuration in which the magnetron 2 is attached to the lower wall of the waveguide 3, the positions of the magnetron 2 and the high-voltage transformer 7 are very far apart, and if you try to cool both of them, you will need to use a large cooling fan 8. When using a small cooling fan, it is necessary to increase the winding diameter of the high-voltage transformer 7 or make the core for heat dissipation larger, which increases the weight of the main unit and increases the cost of high-frequency It becomes a heating device.

In addition, since the waveguide 3 is located on the upper surface of the heating chamber upper wall,
The overall height of the main body is also high, which has the drawbacks of requiring more space, requiring more packaging, and increasing transportation costs.

In addition, in devices equipped with a high-frequency heating function and a heater heating function, when the heater heats the heating chamber, the temperature inside the heating chamber becomes high and the side wall of the heating chamber is thermally deformed, causing the oven tray to not enter the heating chamber or falling off the rail. This resulted in the disadvantage that a reinforcing plate had to be welded to prevent thermal deformation of the heating chamber wall surface.

In addition, since the power supply port 6 and the waveguide 3 are provided on the upper wall of the heating chamber, the heat insulating plate 1
The insulation effect of 4 is also poor, and heat is radiated from the power supply port,
Another disadvantage was that the thermal efficiency was reduced and cooking using the heater could not be done efficiently.

Purpose of the Invention The present invention solves the above-mentioned drawbacks of the conventional technology.The magnetron and the high-voltage transformer can be efficiently cooled even when a small cooling fan is used during high-frequency heating, and the high-voltage transformer can be further downsized. In addition, it has the effect of preventing heat radiation from the waveguide when heating the heater and improving thermal efficiency.
The aim is to provide a small, lightweight, and efficient high-frequency heating device.

Structure of the Invention In order to achieve the above object, the present invention provides a power supply port on the side wall of the heating chamber, and a waveguide for guiding high frequency waves to the power supply port is provided on the outside of the side wall of the heating chamber, thereby bringing the magnetron and the high voltage transformer close to each other. , which is configured so that efficient cooling can be achieved even with the use of a small cooling fan. Furthermore, since there is no box-shaped waveguide or the like on the upper surface of the heating chamber, a sealed air layer can be formed with a heat insulating plate, and the structure is configured to increase thermal efficiency.

DESCRIPTION OF EMBODIMENTS An embodiment of the high frequency heating device according to the present invention will be described below with reference to the drawings.

In Figures 2 and 3, 1 is a heating chamber in which food is placed and performs high-frequency heating and heater heating, 2 is a magnetron that is a high-frequency oscillator that supplies high-frequency power to the heating chamber 1, and 3 is a heating chamber that uses high-frequency waves oscillated by the magnetron 2. A waveguide leading to the chamber 1 is composed of a waveguide box-shaped part 3a and a waveguide lower plate part 3b. 4
is the upper wall of the heating chamber forming the heating chamber 1, and 5 is the side wall of the heating chamber, and the high frequency waves oscillated by the magnetron 2 are supplied into the heating chamber 1 from the power supply port 6 provided on the side wall 5 of the heating chamber. ing. Further, 7 is a high voltage transformer that supplies high voltage power to the magnetron 2, and 8 is a cooling fan that cools the magnetron 2 and the high voltage transformer 7. The cooling fan 8 is rotated by a drive motor 9.

The cooling air that has cooled the magnetron 2 with this cooling fan 8 passes through the air guide 10 and passes through the heating chamber side wall 5.
It is designed to be fed into the heating chamber through a punched hole 11 provided in the heating chamber.

Further, 12 and 13 are electric heaters fixed at the upper and lower parts of the heating chamber 1, and are used for oven/grill cooking, etc., and are used to bake cakes and sweets, and to brown the surface of food. It is.
A heat insulating plate 14 is provided to prevent heat radiation from the heating chamber upper wall 4 when cooking is performed using the electric heaters 12 and 13, and an air layer is formed between the heating chamber upper wall 4 and the stepped heating plate 14. Improves thermal efficiency.

The operation of the above configuration will be explained below.

First, in the case of high frequency heating, when power is supplied to the high voltage transformer 7, the high voltage power is supplied from the high voltage transformer 7 to the magnetron 2, and the magnetron 2 oscillates. The high frequency waves oscillated from the magnetron 2 are guided by a waveguide 3, enter the heating chamber 1 through a power supply port 6 provided on the side wall 5 of the heating chamber, and irradiate the food placed inside the heating chamber 1. It is then heated and cooked. At the same time as power is supplied to the high voltage transformer 7, power is also applied to the cooling drive motor 9, the cooling fan 8 starts rotating, and the cooling air sent from the cooling fan 8 causes the magnetron 2 and the high voltage Cooling transformer 7. This cooling fan 8 usually uses blades called propeller fans, and it is known that due to its characteristics, the wind is sent not only in the axial direction but also in a radial direction.

Therefore, if the magnetron 2 is mounted inclined at an arbitrary angle in the direction of the highest flow rate of the cooling air sent by the cooling fan 8, the cooling efficiency of the magnetron 2 will be improved. In addition, since the temperature of the cooling air after cooling the magnetron 2 has increased, it flows upward, and the punched hole 1 provided in the heating chamber side wall 5 flows upward.
It flows in more smoothly than 1.

On the other hand, in the case of heater heating, the electric heaters 12 and 13 shown in FIG. 2 work to raise the temperature inside the heating chamber 1. As the temperature inside the heating chamber rises, the heating chamber 1 wall surface begins to thermally expand, and the heating chamber side wall 5
However, as in the present invention, the heating chamber side wall 5
When the waveguide 3 is fixed to the heating chamber 1, it serves as reinforcement and prevents deformation, and the phenomenon of the oven plate not entering the heating chamber 1 or falling off the rail will be eliminated. In addition, as shown in FIG. 3, hot air also leaks from the intake punching hole 11 provided in the side wall 5 of the heating chamber, but since the heat radiation opening of the magnetron 2 is located below the punching hole 11, A thermal gradient is created between the hole 11 and the heat radiation opening of the magnetron 2, and leakage of hot air from the punched hole 11 is small. Therefore, heat loss can also be kept to a minimum.

According to this embodiment, during high-frequency heating, the flow rate of the cooling air flowing through the magnetron 2 increases and flows smoothly, so the cooling effect of the magnetron 2 is enhanced and high-frequency output can be stably obtained. In addition, the life of the magnetron 2 is also extended.

Furthermore, when the heater is heated, there is little heat loss from the air intake punching hole 11 in the side wall 5 of the heating chamber, and the upper wall 4 of the heating chamber has no openings such as the power supply port 6 and is completely sealed by the heat insulating board 14. Since the air layer is formed, the thermal efficiency is increased, and there is an effect that efficient heating heating cooking can be performed.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) Since the cooling air from the propeller fan flows out radially in the axial direction, a large amount of cooling air flows in through the heat dissipation opening of the magnetron and flows upward smoothly, increasing the cooling effect of the magnetron. As a result, high-frequency output can be stably obtained, the life of the magnetron can be extended, and deterioration over time can be reduced.

(2) By installing a waveguide on the side wall of the heating chamber, the magnetron and high-voltage transformer are brought close together, allowing effective cooling even with a small cooling fan and drive motor. Furthermore, since the high-voltage transformer and the cooling fan are also located close to each other, the cooling effect of the high-voltage transformer is enhanced, and the high-voltage transformer can be made smaller and lighter.

(3) By installing the waveguide on the side wall of the heating chamber, it is possible to not only downsize the high-voltage transformer and cooling fan drive motor, but also to reduce the total height of the main unit, making it possible to make the main body of the high-frequency heating device smaller and lighter. becomes. As a result, packaging time and transportation costs can be reduced.

(4) By providing the power supply port on the side wall of the heating chamber, an air layer is created on the upper wall of the heating chamber that is sealed with a heat insulating plate, increasing thermal efficiency, and the punched hole for intake on the side wall of the heating chamber and the magnetron heat dissipation opening are A thermal gradient is created, making it possible to minimize heat loss.

(5) Due to the increase in thermal efficiency in the heating chamber, cooking can be done by heating the heater in a short time, and with less power consumption, economical cooking can be achieved.

[Brief explanation of drawings]

Figure 1 is a front sectional view of a conventional high-frequency heating device.
FIG. 2 is a front cross-sectional view of a high-frequency heating device showing an embodiment of the present invention, and FIG. 3 is a cross-sectional view of the essential parts thereof. 1... Heating chamber, 2... Magnetron (high frequency oscillator), 6... Power supply port, 7... High voltage transformer, 8
...Cooling fan, 9...Drive motor, 10...
Air guide, 11...Punching hole.

Claims (1)

[Scope of Claims] 1. A heating chamber in which food is stored and cooked in the main body, a high-frequency oscillator that supplies high-frequency waves into the heating chamber, a waveguide that guides the high-frequency waves oscillated from the high-frequency oscillator into the heating chamber, and the In a high-frequency heating device equipped with a high-frequency oscillator and a cooling fan for cooling power supply components, the waveguide is provided on a side wall of the heating chamber, and the high-frequency oscillator is installed on the waveguide so that the tip of the oscillator and the side wall of the heating chamber face each other. A high-frequency heating device in which the high-frequency oscillator is fixed to the waveguide, and the heat radiation opening of the high-frequency oscillator is fixed to the waveguide at an arbitrary angle with respect to the axial direction of the cooling fan. 2 A box-shaped heat insulating board is provided on the upper surface of the upper wall of the heating chamber, an air intake opening is provided on the side wall of the heating chamber, an air guide is provided to guide the cooling air of the high-frequency oscillator into the heating chamber, and the front air intake opening is provided with the air intake opening for the high-frequency oscillator. The high-frequency heating device according to claim 1, which is provided above the heat dissipation opening.