JP2563566B2 - High frequency heating equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cooling a high frequency generator, that is, an electric component such as an inverter power supply in a high frequency heating device.

BACKGROUND ART Conventionally, power is generally supplied to a magnetron of a conventional high-frequency heating device by boosting a commercial power source with a high-voltage transformer to convert the power, and doubling the output of the output with a high-voltage capacitor and a high-voltage diode to supply power to the magnetron. Was used.

However, in order to make products lighter and more cycle-free, which has been strongly demanded by the market in recent years, there is an inverter power supply that rectifies commercial power, converts it to direct current, converts it to high frequency by high frequency switching, and then boosts it with a transformer. It has been used as a power supply for magnetrons.

An example of the high-frequency heating device using the conventional inverter power source will be described below with reference to FIGS. 3 and 4.

FIG. 3 is a side sectional view of a machine room of a conventional high frequency heating apparatus using an inverter power source, and FIG. 4 is a top sectional view of the machine room.

In FIGS. 3 and 4, a propeller fan 2 is attached to the rear surface of the outer casing 1, a magnetron 3 is provided above the propeller fan 2, and a dish cradle driving electric motor 4 for rotating food under the magnetron 3. Is installed.
The magnetron 3 is provided with a blower duct 5 for blowing cooling air into the heating chamber and an air guide 6 for guiding the wind of the propeller fan 2 to the magnetron 3. A board constituting the inverter power supply (hereinafter referred to as an inverter board 7) is attached to a space between the magnetron 3 and the plate pedestal drive motor 4 from before the propeller fan 2. An intake hole is provided on the rear surface of the outer shell 1, and an exhaust hole is provided on the bottom surface and the right side surface. As the propeller fan 2 rotates, the air is introduced into the outer shell 1 from the intake hole provided on the rear surface of the outer shell 1 as shown by the arrow, and the components on the inverter board 7, the magnetron 3, the plate pedestal driving electric motor 4, etc. are cooled. The air is exhausted to the outside through the exhaust holes on the bottom surface and the right side surface of the.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described conventional configuration, as shown in FIGS. 5A and 5B, the wind flow of the propeller fan 2 is uniform and constant over the entire circumference in the axial direction while maintaining the component in the rotational direction. The wind spreads at an angle. For this reason, it is necessary that the components such as the inverter board 7 that require cooling be within the divergence angle of the wind of the propeller fan 2 and be close to the propeller fan 2. However, some of the wind does not hit the parts that need cooling, which reduces the cooling effect. Therefore, it is necessary to improve the capacity of the motor 8 that drives the propeller fan 2. Further, a large heat dissipation plate is required for heat-generating components such as the transistor 9. Therefore, the guide 10 is necessary in order to give directionality to the wind flow and enhance the cooling effect, but the metal guide 10 is sufficient because it has to keep a distance from the component generating the high voltage. I couldn't make a size guide 10.
For this reason, a sufficient cooling effect cannot be obtained, and miniaturization of the electric components and the motor 8 for driving the propeller fan 2 is prevented, and thus the equipment exterior 1 for accommodating those components also becomes large, which saves resources. , It was supposed to avoid cost reduction of equipment. Further, since the guide 10 is made of metal, there is a great risk that a high voltage is applied to the guide 10 at the time of repairing or servicing the device, and electric shock may occur. Moreover, in the guide 10 formed of a magnetic metal, the magnetic flux of the high-voltage transformer 11 on the inverter board 7 is affected, and the high-frequency output that is indispensable to the high-frequency heating device is reduced, resulting in deterioration in quality or high performance. Since the high voltage transformer 11 is used, it has been a cause of cost increase.

The present invention is to solve the above-mentioned conventional problems, to realize an efficient cooling structure, prevent the temperature rise of the components on the inverter board, low cost, downsizing,
It is an object of the present invention to provide a high-frequency heating device which is of high quality to the user and which is safe even when repairing or servicing equipment.

Means for Solving the Problems In order to achieve this object, a high-frequency heating apparatus of the present invention is an inverter board including a magnetron that oscillates a high frequency and an electric component such as a high-voltage transformer that generates a high voltage to be supplied to the magnetron. A propeller fan for cooling the electric components on the magnetron and the inverter board, and a cooling for directing the wind to the electric components on the inverter board for directing the wind from the propeller fan to generate a high voltage. A guide, a machine room for accommodating the parts and the like, and an outer shell covering the machine room and the like for concealing the parts for generating a high voltage on the inverter board, and an outer shell for covering the electrical parts room. The cooling guide should be located inside the outer wall of the electrical component chamber so that it cannot be easily touched from the outside when removed. A barrier is provided.

Operation The present invention having the above-described configuration allows the guide to be arranged extremely close to the electric components on the inverter board, and therefore the wind can be efficiently applied to enhance the cooling effect. The magnetic flux of the high-voltage transformer on the inverter board is not affected, and the high-frequency output, which is essential for the high-frequency heating device, does not decrease. In addition, the risk of electric shock is low due to the insulation effect when repairing equipment.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a right side sectional view of a machine room of a high frequency heating apparatus according to an embodiment of the present invention, and FIG. 2 is a top sectional view of the machine room.

In FIGS. 1 and 2, an intake hole (not shown) is provided on the rear surface of the outer shell 1, and a propeller fan 2 and a motor 8 for driving the propeller fan 2 are provided inside the intake hole. An intake guide 12 is provided on the outer periphery of the propeller fan 2 so as to regulate the direction of the wind and prevent the wind, which has cooled the electric parts, from being sucked into the propeller fan 2 again. The inverter board 7 is arranged at the lower end of the propeller fan 2 so that electric components such as the high voltage transformer 11 face upward.
Also, on the inverter board 7, a high voltage transformer 11 for boosting the primary voltage, a high voltage diode 1 for rectifying the boosted voltage.
3, switching element 14 for converting commercial frequency to high frequency
Parts having large heat generation such as are arranged near the propeller fan 2 having a large wind speed and volume.

In the above-mentioned configuration, the cool air sucked from the rear intake holes of the outer shell 1 by the propeller fan 2 is divided into two, that is, the cooling of the magnetron 3 and the cooling of the components on the inverter board 7. The air that has cooled the magnetron 3 flows through the air duct 5 into the heating chamber. The cold air that has flowed to the inverter board 7 flows evenly and uniformly over the entire circumference in the axial direction at an angle while maintaining the component in the direction of rotation of the propeller fan 2. There is a heating chamber wall surface 15 and a cooling guide 16 made of synthetic resin on both sides, and the spreading component is converted into an axial component.

Therefore, the air flowing along the inverter board 7 and the air flowing along the heating chamber wall surface 15 and the cooling guide 16 are obtained for the components on the inverter board 7.

Since the cooling guide 16 is made of synthetic resin, there is no need to worry about a decrease in high-frequency output due to the influence of the magnetic flux of the high-voltage transformer 11 and securing of an insulation distance from the electric parts, and the cooling guides 16 are arranged very close to the electric parts. Can cool efficiently.

The wind that has cooled the electrical components on the inverter board 7 is the operating unit.
It wraps under the gap between 17 and the inverter board 7
Is exhausted from the bottom of the. Electric components such as the plate cradle driving electric motor 4 that generate less heat are cooled by using cooling air that has cooled the electric components on the inverter board 7 and arranging them on the exhaust route.

In this embodiment, with the outer shell 1 removed, the cooling guide 16 hides the high voltage transformer 11, the high voltage diode 13, the switching element 14 and other components that generate a high voltage from the outside and makes them easy to touch. Since the barrier 18 is provided by the cooling guide so as to be located inside the outer wall of the electrical component room so that it cannot be prevented, there is little risk of electric shock during repair and service of the equipment and safety. Is.

With the above-described configuration, the guide can be arranged extremely close to the electric components on the inverter board, so that the cooling effect can be enhanced by efficiently applying the wind, and the components on the inverter board can be improved. The temperature rise is prevented, the cost is reduced, the magnetic flux of the high-voltage transformer on the inverter board is not affected, and the high-frequency output that is indispensable for the high-frequency heating device is not reduced. It is possible to provide a safe high-frequency heating device with a low risk of electric shock due to an insulating effect during repair, service, etc.

EFFECTS OF THE INVENTION As is clear from the description of the above embodiments, the present invention provides a magnetron, an inverter board, a propeller fan for cooling electric components on the magnetron and the inverter board,
Efficient cooling is achieved by providing a guide for directing the wind from the propeller fan to the electric parts that generate high voltage on the inverter board, and the guide is made of synthetic resin. It is possible to realize a high frequency heating device that realizes a structure, prevents temperature rise on the inverter board, is low in cost and downsized, has good quality for the user, and is safe when repairing or servicing equipment. .

[Brief description of drawings]

1 is a side sectional view of a machine room of a high-frequency heating apparatus according to an embodiment of the present invention, FIG. 2 is a top sectional view of the machine room, and FIG.
FIG. 4 is a side sectional view of a machine room of a conventional high-frequency heating apparatus, FIG. 4 is a top sectional view of the machine room, and FIGS. 5A and 5B are side and front views of a propeller fan. 2 ... Propeller fan, 3 ... Magnetron, 7 ... Inverter board, 16 ... Synthetic resin cooling guide, 18
……barrier.

Claims (1)

(57) [Claims] 1. An inverter board including a magnetron that oscillates a high frequency, an electric component such as a high-voltage transformer that generates a high voltage supplied to the magnetron, and a propeller fan that cools the magnetron and the electric components on the inverter board. And a cooling guide for directing the wind from the propeller fan to the electric parts that generate a high voltage on the inverter board, a machine room for accommodating the parts, the machine room, etc. An outer shell for covering the components that generate a high voltage on the inverter board, and when the outer shell for covering the electric component chamber is removed, so that it cannot be easily touched from the outside,
A high-frequency heating device configured to provide a barrier with the cooling guide so as to be located inside the exterior plate of the electric component chamber.