JPH0319452B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to improving the thermal efficiency and temperature distribution performance 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 methods have been used to use a damper device to prevent the cooling air from the high-frequency heating device from entering the oven chamber during simultaneous cooking, but this method is extremely costly. The disadvantage is that it is expensive.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and provides a composite heating cooker that has good thermal efficiency, good temperature distribution performance in the oven, and is capable of simultaneous cooking.

Configuration of the Invention In order to achieve the above object, the present invention includes a heating chamber,
It has a high frequency oscillator, a fan device for cooling the high frequency oscillator, a fan device for circulating hot air in a heating chamber, a heat source, and an electric heater provided in the heating chamber, The air channels are separated so that the majority of the air flowing into the heating chamber by the cooling fan and the air flowing into the heating chamber due to hot air circulation do not mix inside the heating chamber.
The electric heater is installed outside the air path of the hot air circulation fan, and even if the air from the cooling fan enters the oven during simultaneous cooking, it does not mix with the air from the hot air circulation, making it difficult for the temperature inside the oven to drop. This has the effect of improving thermal efficiency, and at the same time keeping the entire heating chamber at a uniform temperature by supplementally heating the areas where the hot air circulating fan does not flow and the temperature is difficult to rise using the electric heater. be.

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

FIG. 1 is a perspective view of a product according to the present invention 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.
23 is a hot air discharge hole into the oven, and 23 is a suction hole into the hot air chamber.

24 is a main intake hole through which cooling air enters the oven chamber, 26 is an auxiliary intake port, and 25 is an exhaust port for cooling air and steam.

The grill heater 13 is located near the top wall of the oven, away from the hot air path and in the cooling air path.

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 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 1, 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 1 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 raise the temperature inside the oven 1 and cook the food.

At this time, since there are no holes for discharging hot air at the top of the rear wall of the oven, the hot air hardly flows near the top wall of the oven, and the temperature in this area decreases, but the grill heater 13 installed near the top wall of the oven By supplying electricity, the temperature inside the oven 1 can be made uniform. On the other hand, most of the cooling air from the high-frequency oscillator enters the oven 1 through the main intake port provided at the front upper part of the oven side wall, flows almost diagonally along the oven upper wall, and flows at the rear upper part of the opposite side wall. It is exhausted to the outside of the refrigerator from the exhaust port 25. 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 in the oven 1 for most of the cooling air from the high frequency oscillator and the hot air are separated,
These two do not mix inside oven 1,
Therefore, even if cooling air is introduced into the oven 1, the temperature of the hot air will not drop and heating efficiency will not deteriorate.

In addition, by installing the grill heater 13 in the cooling air passage, the temperature of the grill heater 13 can be rapidly lowered by the cooling air after the power supply to the grill heater 13 is stopped, so that there is no need to forget to take out the food after cooking is complete. However, it can also solve the problem of overheating due to residual heat.

Furthermore, when cooking with hot air circulation, the temperature inside the oven is normally preheated until it reaches the set temperature, but in order to shorten this preheating time, it is possible to energize the grill heater 13 at the same time only during preheating. If residual heat from the grill heater 13 remains even after starting cooking, when cooking in two stages at the same time, etc.
Imbalance in heating between the top and bottom tends to occur,
This problem can be solved by rapidly cooling the grill heater 13 with cooling air.

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 dampers that were conventionally required are no longer required, and costs can be significantly reduced.

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

(3) Since the cooling fan of the high-frequency oscillator can be operated during hot-air cooking, the temperature in the electrical parts room can be greatly reduced, greatly improving the reliability and lifespan of parts. The temperature of parts that the user touches, such as the body, can be lowered, and dangers such as burns can be prevented.

(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.

(5) By installing a grill heater outside the hot air path and energizing it as necessary, it is possible to raise the temperature of the areas where the hot air does not circulate and make the temperature inside the refrigerator uniform.

(6) By installing the grill heater in the cooling air path, the temperature of the grill heater can be lowered rapidly as needed, thereby preventing the residual heat of the grill heater from having an adverse effect on cooking.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a product according to an embodiment of the present invention, as seen from the rear with the exterior removed; Figs. 2 and 3;
The figure is a simplified diagram showing the flow of air in the product of the same example. 1...Oven, 3...Hot air chamber, 4...Hot air heater, 5...Hot air fan, 9...Cooling fan,
13...Grill heater, 20,21,22...
Hot air discharge hole, 23...Hot air suction hole, 24
... Cooling air intake hole, 25... Cooling air exhaust hole.

Claims (1)

[Scope of Claims] 1. A heating chamber, a high-frequency oscillator, a cooling fan for cooling the high-frequency oscillator, a fan device for circulating hot air in the heating chamber, a heat source for generating the hot air, and the and an electric heater installed in the heating chamber, and separates the majority of the air flowing into the heating chamber by the cooling fan of the high frequency oscillator and the air path of the air flowing into the heating chamber by the hot air circulation fan, and The composite heating cooker is configured such that the heater is provided outside the air path of the hot air circulation fan. 2. The composite heating cooker according to claim 1, wherein the electric heater is provided in the air passage of the cooling fan. 3. The composite heating cooker according to claim 1, which is configured to simultaneously energize an electric heater provided in the oven intermittently during hot air cooking.