JPH0319451B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to improving the thermal efficiency of a composite heating cooker that combines a hot air circulation type oven and a microwave oven.

Conventional configurations and their problems Conventionally, combined heating cookers that combine a microwave oven and a hot air circulation oven have used each function completely separately or in a programmed sequence for one heating cooking. It was mainly used for cooking, and there was little use for simultaneous cooking, where both functions operated at the same time. This is due to power consumption, and the input current is too large for a normal household 100V power supply, but 220V to 240V
This simultaneous cooking is possible in countries such as Australia and Europe where power is available. However, when both functions are operated at the same time, as is well known in the case of microwave ovens, the structure is such that the cooling air from the high-frequency oscillator enters the oven chamber to exhaust the steam generated from the food, and also prevents the door screen from fogging up. Because of this, there is a problem in that this cooling air mixes with the hot air circulation, lowering the temperature inside the refrigerator and deteriorating thermal efficiency. To solve this problem, some systems have been implemented that use a damper device to prevent the cooling air from the high-frequency heating device from entering the oven during simultaneous cooking, but this structure is extremely costly. The problem is that it is expensive.

Purpose of the invention The present invention solves the above-mentioned conventional problems.
To provide a composite heating cooker that has good thermal efficiency and low cost and is capable of simultaneous cooking.

Structure of the Invention In order to achieve the above object, the present invention includes a heating chamber, a high frequency oscillator, a fan device for cooling the high frequency oscillator, a fan device for circulating hot air in the heating chamber, and a heat source. However, in order to prevent most of the air flowing into the heating chamber by the cooling fan of the high-frequency oscillator from mixing with the air flowing into the heating chamber due to hot air circulation, the air paths are separated into separate air paths, which can be cooled during simultaneous cooking. Even if the air from the fan enters the oven, it does not mix with the air from the hot air circulation, so the temperature inside the oven is less likely to drop, and this has the effect of improving thermal efficiency.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a view of the product according to the present invention as seen diagonally from behind with the exterior removed. 1 is an oven, and a hot air chamber 3 is provided adjacent to the back of the oven. A hot air heater 4 and a hot air fan 5 (both shown in FIG. 3) are provided in the hot air chamber 3, and the hot air fan 5 is rotationally driven by a motor 6. 7 is a high frequency oscillator, and the radio waves oscillated by this are radiated into the oven 1 through a waveguide 8. 9 is a fan for cooling the high frequency oscillator, and 10 is a fan motor for rotating the fan 9. The cooling air from the fan 9 cools the high frequency oscillator 7 and is then guided by the air guide 11.
It enters the oven and is exhausted out of the oven along with the steam generated from the food during cooking. 12 is a partition plate that partitions the air intake side and the air outlet side in order to improve the cooling efficiency of the fan 9;
is a grill heater used for grilling food.

20, 21 and 22 in Figures 2 and 3.
is a discharge hole for hot air into the oven, and 23 is a suction hole. 24 is a main intake hole through which cooling air enters the oven, 26 is an auxiliary intake port, and 25 is an exhaust port for cooling air, steam, etc.

The operation of the above configuration will be explained below.
The air heated by the hot air heater 4 is turned into hot air by the hot air fan 5 and discharged through the discharge holes 20, 21, and 22 provided at both left and right sides and at the bottom of the rear wall of the oven.
It enters the oven chamber, flows along the side walls and bottom wall, and then changes direction by 180 degrees when it hits the door.
The air flows backward through the center of the oven interior and returns to the hot air chamber 3 through the suction hole 23 in the center of the rear wall of the oven, repeating this cycle to uniformly raise the temperature inside the oven and cook the food. At this time, since there are no holes for discharging hot air in the upper part of the rear wall of the oven, hardly any hot air flows near the upper wall of the oven.

On the other hand, most of the cooling air from the high-frequency oscillator enters the oven chamber through the main intake port 24 provided at the front upper part of the oven side wall, flows toward the oven upper wall, and then almost diagonally to the rear upper part of the opposite side wall. The air is exhausted from the main exhaust port 25 into the refrigerator. At this time, the steam generated from the cooking food is also exhausted. A portion of the cooling air enters through the auxiliary intake port 26 and flows along the door surface to prevent the door window from fogging up. In this way, since the air paths inside the oven for most of the cooling air from the high frequency oscillator and the hot air are separated, the two do not mix inside the oven. The temperature of the hot air will drop even if the hot air is put into the tank, and the heating efficiency will not deteriorate.

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

(1) When cooking with hot air, even if cooling air from a high-frequency oscillator is introduced into the oven, the heating efficiency will not deteriorate, so devices such as a darper, which were required in the past, are no longer required, and costs can be significantly reduced.

(2) By introducing cooling air into the oven during hot air cooking, steam generated from the food can be exhausted, preventing the food from becoming sticky and making it delicious and crispy.

(3) Since the high-frequency oscillator cooling fan can be operated while food is being cooked with hot air, the temperature in the electrical parts room can be significantly lowered, greatly improving the reliability and lifespan of parts, and improving control. However, it can also lower the temperature of parts that the user touches, such as the panel and body, and can prevent risks such as burns.

(4) By lowering the temperature of the electrical parts room during heating with hot air, there is no need for extra insulation between the oven and the electrical parts room, and the product cost can be reduced.

[Brief explanation of the drawing]

Figure 1 shows the product related to the present invention with the exterior removed.
The perspective view as seen from the rear side, FIGS. 2 and 3 are simplified diagrams showing the flow of wind in the product of the same embodiment. 1...Oven, 3...Hot air chamber, 4...Hot air heater, 5...Hot air fan, 9...Cooling fan,
20, 21, 22... Hot air discharge hole, 23... Hot air suction hole, 24... Cooling air intake hole, 25
...Exhaust hole for cooling air.

Claims (1)

[Scope of Claims] 1. A heating chamber, a high-frequency oscillator, a fan device for cooling the high-frequency oscillator, a fan device and a heat source for circulating hot air in the heating chamber, and a cooling fan for the high-frequency oscillator. This composite cooking device has a configuration in which the majority of the air flowing into the heating chamber and the air path flowing into the heating chamber using a hot air circulation fan are separated. 2. A composite according to claim 1, wherein most of the air from the cooling fan of the high-frequency oscillator is flowed along the upper wall of the heating chamber, and the air from the hot air circulation fan is flowed below the upper wall. Heating cooker. 3. The composite cooking device according to claim 1, which is configured to separate the air from the cooling fan into a component that flows along the upper wall of the heating chamber and a component that flows along the inner surface of the door.