JPH0675428B2 - Heating device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure of a high-frequency oscillator equipped with a hot-air circulating heating device.

2. Description of the Related Art In a cooling configuration of a high-frequency heating device with a hot-air circulation heating device, a cooling fan dedicated to high-frequency heating and a cooling fan operated during heating of a heater are provided.
The cooling fan operated when the heater is heated is disposed above the front portion of the main body portion where the electric components are disposed or above the rear portion of the main body portion.

A case where the cooling fan 12 is arranged above the front part of the main body is shown in FIG. 3 (conventional example 1). The cooling air becomes a descending air behind the high frequency oscillator arranged in the center of the side surface of the heating chamber. A circulation cycle was formed in which the cooling fan 12 was sucked into the front of the main body again and the cooling effect was significantly reduced. In addition, this downward wind suppresses the upward flow of thermal natural convection from the rear of the bottom of the heating chamber, and the bottom of the heating chamber and the lower part of the main body are not cooled, creating a high-temperature atmosphere, which protects the electrical components, etc. It wasn't good from a sex perspective either.

Problems to be Solved by the Invention On the other hand, FIG. 4 (conventional example 2) shows a case in which the cooling fan 13 is provided on the upper rear side of the main body, but the cooling air is provided in the center of the side surface of the heating chamber. It had the same drawback as the above-mentioned conventional example in that a cooling cycle was formed in which a cooling wind was generated in front of the high-frequency oscillator and turned around to the rear of the main body to be sucked into the cooling fan again, thereby significantly reducing the cooling effect.

Further, the high-frequency oscillator with hot-air circulation type heating device has a combination heating mode in which high-frequency heating and heater heating are alternately operated. However, in the conventional example, when operating in this mode, the second cooling fan 13 is used. Since the high frequency oscillation device is not sufficiently cooled, the first cooling fan 14 for cooling the high frequency heating device must be used for cooling.
Naturally, the first cooling fan 14 also serves as a fan for heating the heating chamber at the time of high-frequency heating, and thus has a drawback that the heating efficiency of the heater heating in the combination mode is significantly reduced.

The present invention solves the above-mentioned drawbacks of the conventional example. When the heater is heated, the cooling fan suppresses the circulation of the cooling air in the main body so that the downward natural air does not interfere with the thermal natural convection. It aims to promote natural convection and dramatically increase the cooling effect.

Also, in combination heating mode in which high frequency heating and heater heating are alternately operated, cooling is performed without the operation of a cooling fan dedicated to high frequency heating to prevent the cooling air from flowing into the heating chamber, and even during combination heating. It is intended to perform efficient heater heating.

Means for Solving the Problems The present invention provides a cooling fan that cools electric parts and structural parts that need to be cooled when heating a heater, in the vicinity of the upper part of a high-frequency heating device that is arranged substantially in the center of a heating chamber side wall. It was set up.

In a combination heating mode in which high-frequency heating and heater heating are alternately operated, a cooling fan dedicated to high-frequency heating is stopped and a second cooling fan arranged close to the upper part of the high-frequency heating device is operated. Is.

The cooling fan, which cools the electric parts and structural parts that need to be cooled when the working heater is heated, is arranged near the upper part of the high-frequency heating device and in the central upper part of the main body. Therefore, the cooling air at the time of heating the heater is uniformly taken in by the cooling fan from the front and the rear of the high-frequency heating device in the main body and is evenly blown upward. Since the intake air pressure balance is maintained, the blowing air does not descend into the main body and the cooling air does not form a circulation cycle. Also, because only the upward wind flow is inside the main body,
Natural thermal convection is also promoted and the cooling effect inside the main body is significantly enhanced.

Further, even in the combination heating mode in which high frequency heating and heater heating are alternately operated, the second cooling fan is close to the upper part of the high frequency heating device and cools the entire surface of the high frequency heating device. The heating device can be cooled.

Therefore, the cooling fan dedicated to high frequency heating can remain stopped, and it is possible to prevent the cooling air from flowing into the heating chamber due to the operation of the cooling fan dedicated to high frequency heating, and to improve the heater heating efficiency during combination mode heating. It can be done.

Embodiment An embodiment of the present invention will be described below with reference to the configuration diagram. As shown in FIG. 1, a high frequency oscillating device 2 is attached to the heating chamber 1 approximately at the center of its side surface, and is supplied with power by a high voltage transformer 3 or the like arranged in the main body of the device to enable high frequency oscillating in the heating chamber. It has become like. A heater 4 and a circulation fan 5 are arranged above the heating chamber. The circulation fan 5 is driven by a motor 7 via a belt 6 so that the heating chamber can be heated by the heater. A first cooling fan 8 for cooling the high-frequency heating device is provided at the rear of the main body so as to face the high-frequency heating device 2, and is driven by a motor 9 fixed to the main body by a mounting bracket during high-frequency oscillation. ing. Further, the cooling air from the first cooling fan 8 is introduced into the heating chamber from the intake port 10 of the heating chamber through the cooling passage in the high-frequency oscillator to ventilate the heating chamber.

In addition, a second cooling fan 11 for cooling electric parts and structural parts that need to be cooled when the heater is heated is provided near the upper part of the high-frequency oscillator 2 in the central upper part of the main body, and is fixed to the main body by a mounting bracket. The motor 7 is driven together with the circulation fan 5 when the heater is heated. FIG. 2 shows a ventilation path of cooling air when the heater is heated.
Since the second cooling fan is arranged near the upper part of the high-frequency heating device 2 and in the substantially central upper part of the main body, intake and exhaust are performed while maintaining a balance from the front part and the rear part of the main body, and the air pressure balance is maintained. Because there is no downdraft in the body. Therefore, the cooling air blown out from the second cooling fan 11 does not form a circulation cycle in the main body. Further, since all the cooling air in the main body becomes an upward flow, natural convection from the bottom of the heating chamber is further promoted, and the cooling effect is dramatically enhanced.

Further, in the combination heating mode operation in which high frequency heating and heater heating are alternately and continuously operated for a short time, the first cooling fan 8 for cooling the high frequency heating device 2 is stopped and the second cooling fan 8 is stopped. The fan 11 is driven for cooling. In the combination heating mode operation, the high-frequency oscillation is an intermittent operation for a short time, so that the high-frequency oscillator 2 and the high-voltage transformer 3 generate less heat than in the continuous oscillation, and the second cooling fan 11 operates in the high-frequency oscillator 2. Since the cooling air sucked by the second cooling fan 11 cools the entire surface concentrated in the high-frequency oscillator 2 and the high-voltage transformer 3 because it is arranged immediately above, the second cooling fan 11 alone Cooling is ready. As described above, in the combination heating mode, the cooling can be performed while the first cooling fan 8 that cools the high-frequency oscillator 2 is stopped. Therefore, the heater accompanying the inflow of the cooling air from the first cooling fan 8 into the heating chamber is achieved. It prevents a significant decrease in heating efficiency.

EFFECTS OF THE INVENTION As described above, according to the present invention, the cooling air at the time of heating the heater can be all made to be an upward flow, so that thermal natural convection is dramatically accelerated and a remarkable cooling effect can be obtained. In addition, in the combination heating mode, it is possible to obtain a much higher heater heating efficiency than before, which greatly contributes to the improvement of product performance and thus to the improvement of product safety.

[Brief description of drawings]

FIG. 1 is an internal perspective view of a heating device according to an embodiment of the present invention, FIG. 2 is an explanatory view of a cooling air flow path when the heater is heated, and FIG. 3 is an explanatory view of a conventional cooling air flow path. FIG. 4 is an explanatory view of another conventional cooling air flow path. 1 ... Heating chamber, 2 ... High-frequency oscillator, 3 ... High-voltage transformer, 4 ... Heater, 5 ... Circulation fan, 6 ... Belt, 7 ... Motor for driving circulation fan and second cooling fan , 8: first cooling fan, 9: motor for driving the first cooling fan, 10: intake port in the heating chamber, 11:
Second cooling fan.

Claims (1)

[Claims] 1. A heating chamber for storing food in a main body for heating and cooking, a high-frequency heating device for radiating high-frequency waves in the heating chamber, a first cooling fan for cooling the high-frequency heating device, and a first cooling. A motor that drives the fan to rotate, a heater that raises the temperature of the atmosphere in the heating chamber, a circulation fan that circulates the atmosphere in the heating chamber, a motor that drives the circulation fan by a belt, and an upstream wind when the heater is heated. For cooling electrical and structural parts that need cooling by cooling
Cooling fan, an intake part provided at the front and rear parts of the bottom of the main body, and an exhaust part provided at the front part and the rear part of the top of the main body, the high-frequency oscillation device, substantially in the center of the heating chamber side wall. A heating device having a second cooling fan arranged near the upper part thereof.