JPS61125524A - Complex heat-cooking apparatus - Google Patents

Abstract

PURPOSE:To provide a complex heating cooking apparatus capable of simultaneous heat-cooking foods with good efficiency by separating air passages so that air flowing by a cooling fan of a high-frequency oscillator and air flowing by a hot air circulation do not mix with each other within a heating chamber, and providing an electric heater outwardly of the air flow passage of the hot air circulation fan. CONSTITUTION:Air heated by an air heater 4 is converted into hot air by a hot air fan 5, and enters into an oven 1 through exhaust ports 20, 21 and 22 provided at both left and right sides of a rear wall of the oven 1 and flows along the side wall and bottom wall. then, hot air hits against a door and converts its flow direction at an angle of 180 deg.C, and then counterflows through the central part within the oven 1 and returns from a suction hole 23 at the central part of the oven rear wall to the hot air chamber 3. The above circulation of hot air is repeated to increase the temperature within the oven 1 and heat-cook the food. A major part of cooling air from the high frequency oscillator is introduced into the oven 1 through a main suction port provided at the front side upper part of the oven side wall, and flows along the oven side wall, and is exhausted out of the case the rear side upper part of the side wall on the opposite side.

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 oven and a microwave oven.

゛ Conventional structure and its problems Conventionally, a combined heating cooker that combines a microwave oven and a hot air circulation oven has either used each function completely separately or programmed sequences in one heating cooking. It was mainly used for cooking, and there was little use for simultaneous cooking, where both acid parts operate 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 from 220V to
This simultaneous cooking is possible in Australia, Europe, etc. where 240 ■ power source 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. Therefore, there is a problem that this cooling air mixes with the circulating hot air, lowering the temperature inside the refrigerator and reducing 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.

Structure of the Invention In order to achieve the above object, the present invention provides 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, a heat source, and an electric heater provided in the heating chamber,
The air passages are separated so that most of the air flowing into the heating chamber by the cooling fan of the high frequency oscillator and the air flowing into the heating chamber by hot air circulation do not mix together in the heating chamber, and the electric heater is operated by the hot air circulation fan. The structure is installed outside the air path, so 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 shield ring, which lowers the internal temperature and improves hot efficiency. At the same time, the electric heater is used to supplementally heat the areas where hot air from the hot air circulation fan does not flow and the temperature is difficult to rise, thereby achieving a uniform temperature throughout the heating chamber.

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 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.

Inside the hot air chamber 3, there is a hot air heater 4 and a hot air fan 5.
(all shown in FIG. 3) are provided, 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. After cooling the high-frequency oscillator 7, the cooling air generated by the fan 9 is guided by an air guide 11, enters the oven 1, and is exhausted to the outside of the oven together 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, and 13 is a grill heater used for grilling food.

In FIGS. 2 and 3, 20, 21 and 22 are discharge holes for hot air into the oven, and 23 is a suction hole for hot air into the hot air chamber.

24 is the main intake hole through which cooling air enters the oven compartment, and 26
25 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, enters the oven 1 through the discharge holes 20, 21, and 22 provided on both left and right sides and the bottom of the rear wall of the oven, and blows into the side wall and bottom wall. Then, it hits the door, changes direction by 180 degrees, flows back through the center of the oven l circle, returns to the hot air chamber 3 through the suction hole 23 in the center of the oven rear wall, and repeats the cycle. Cook food by raising the internal temperature.

At this time, since there are no hot air outlet holes in the upper part of the rear wall of the oven, the hot air hardly flows near the upper wall of the oven, and the temperature in this area decreases, but the grill heater 13 installed near the upper wall of the oven By supplying electricity, the temperature inside the oven 1 can be made uniform. - Most of the cooling air from the blade high-frequency oscillator enters the oven l through the main air inlet provided at the front top of the oven side wall, flows approximately diagonally along the oven top wall, and flows toward the back of the opposite side wall. Exhaust air is exhausted from the top. At this time, the steam generated from the cooking food is also exhausted. A part of the cooling air enters through the auxiliary intake port 25 and flows along the lid door surface to prevent the door window from fogging up. Since the air paths inside the oven 1 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 1, and therefore the cooling air is kept inside the oven 1. 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.

In addition, by installing the grill heater 13 in the cooling air passage, the temperature can be rapidly lowered by the cooling air after the grill heater 13 stops energizing, so even if you forget to take out the food after cooking, It also solves the problem of overcooking 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, an imbalance between the upper and lower heating tends to occur when cooking in two stages at the same time, but the grill heater 13 can be rapidly cooled with cooling air. Depending on the situation, this problem can also be resolved.

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

■) Even if cooling air from a high-frequency oscillator is introduced into the oven during cooking with hot air, 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, making it possible to cook deliciously and smoothly.

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 drastically reduced, greatly improving the reliability and lifespan of parts.
In addition, the temperature of parts that the user touches, such as the control panel and body, can be lowered to prevent risks such as burns.

4) By lowering the temperature of the electrical parts room during hot air heating, extra insulation between the oven and the electrical parts room is no longer necessary, 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 passage, the temperature of the grill heater can be rapidly lowered as needed, thereby preventing the residual heat of the grill heater from having an adverse effect on cooking.

[Brief explanation of drawings]

Figure 1 shows a product that is an embodiment of the present invention with its exterior removed.
The perspective view seen from the rear, FIGS. 2 and 3 are simplified diagrams showing the flow of air in the product according to the same embodiment. Engineering: Oven, 3: Hot air chamber, 4:
...Hot air heater, 5...Hot air fan,
9... Cooling fan, 13... Grill heater, 20.21.22 Old... Hot air discharge hole, 23
...Hot air intake hole, 24... Cooling air intake hole, 25... Cooling air exhaust hole.

Claims (3)

[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 within the heating chamber, a heat source for generating hot air, and a heating chamber provided within the heating chamber. The air passages are separated so that most of the air flowing into the heating chamber by the cooling fan of the high-frequency oscillator and the air flowing into the heating chamber by the hot air circulation fan do not mix in the heating chamber. The electric 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 path of the cooling fan. (3) The composite heating cooker according to claim 1, wherein the electric heater provided in the oven is simultaneously and intermittently energized during hot air cooking.