JPS587132B2 - Hot air circulation cooking oven - Google Patents

Description

[Detailed Description of the Invention] The present invention achieves uniform heating and high speed through hot air circulation heating, and also makes it possible to adjust the degree of heating from above and below. The purpose is to easily rub the microwave seal.

A conventional example is one in which a sheathed heater is installed inside the heating chamber, and the degree of heating from the top and bottom can be adjusted by switching between the top and bottom heaters.

In addition, although there were gas ovens and other cooking ovens with hot air circulation, there were none that had upper and lower exhaust ports and operated an air volume control board.

An embodiment of the invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view of a main part when a hot air circulation device of an unexpected configuration is provided on the side wall of the heating chamber.

The side wall 1 of the heating chamber constituting the heating chamber (even when the rear wall of the heating chamber is shown is the same, FIG. 1 shows only the case where the side wall is provided).

) This includes an air guide 2, in which a turbo fan 3 is installed in the center of the side wall 1, a heater 4 surrounds the fan 3, and an air intake consisting of a large number of small holes is provided on the side wall facing the fan. An air volume control plate T is provided between the opening 5, the upper and lower ends of the air guide 2, the hot air outlet 6, and the heater 4 and the hot air outlet 6.

Note that a part of the air guide 2 is cut away in FIG. 1 to make it easier to see the inside.

The heater 4 is a sheathed heater, and the air guide 2 is made of metal. When microwaves are supplied to the heating chamber, the penetration part of the air guide 2 of the sheathed heater 4 is equipped with a simple choke mechanism for shielding microwaves. It will be rubbed.

The turbo fan 3 is rotationally driven from the outside by a motor 8,
The hot air inside the refrigerator is sucked in through the central intake port 5, passes through the heater 4, and is sent into the refrigerator through the upper and lower hot air discharge ports.

The hot air control plate 7 has a shaft 9, and this shaft 9 is always urged to the open position by a spring body 10.

For example, a pin 11 is provided on this shaft as shown in FIG.
It is constructed in such a way that it is difficult to operate the rotation.

Therefore, when the knob 12 is at the lowest normal position, the upper and lower air volume control plates are fully open, and when the knob 12 is pushed up to the position shown in Figure 1, the lower air volume control plate is fully closed and the hot air is released from the upper exhaust port 6. This means that only the liquid will be discharged from the refrigerator.

Similarly, when the knob 12 is pushed up further, the reverse upper air volume control plate is fully closed and the lower control plate is fully opened.

Although not shown in the figure, a mechanism for locking the positions of these knobs 12 may be provided, and the display may be made corresponding to the upper and lower heaters, the upper heater, and the lower heater.

The hot air inlet 5 is a small hole having a diameter less than the microwave cutoff wavelength, and the hot air outlet 6 is a small hole having a diameter less than the cutoff wavelength of the microwave, and the hot air outlet 6 has the dimension a in Fig. 1, which is less than i for the wavelength of the microwave used. 1/
About 4λ is lost.

FIG. 2 is a sectional view of the main parts seen from the front of the oven.

The operation panel 15 is partially cut away to show a cross section of the air guide 2 to make it easier to understand the air flow.

Inside the heating chamber 16, 18 trays of food 17 are placed.

The hot air is discharged from the upper hot air outlet 6, but since the saucer 18 has a dimension that covers almost the entire surface of the heating chamber 16, a large amount of the hot air hits the top surface of the food 17, and a small amount of hot air wraps around the bottom surface. do not have.

Although FIG. 2 shows the flow of hot air when it corresponds to the upper heater, it will be easily understood from this explanation also when switching between the upper and lower heaters and the lower heater.

Of course, the air volume control mechanism for the upper and lower exhaust ports can also be achieved by using the control plates in other configurations that block the exhaust ports.

FIG. 2 shows a case in which heating and microwave heating are used together.

Microwaves from the magnetron 19 pass through the waveguide 20,
Power is supplied from the center of the heating chamber 16 through a power supply port 21 .

This power supply port needs to be provided at the center of the heating chamber 16 in order to equalize the heating during microwave heating.

In this case, even if a heating means other than a heater or microwave is used, it is necessary to arrange it symmetrically with respect to the heating chamber 16 in order to achieve uniform heating.

Non-Example As shown in the example above, when using a hot air circulation type cooking oven, even if the hot air circulation mechanism is installed on the side wall or rear wall, uniform heating can be easily achieved. Since the power supply port is held at the center of the upper or lower surface, it is very easy to operate, and an oven with good uniform heating effect and high performance can be obtained.

Inventiveness has such unique features, but each dog has its own unique effects as described below.

(1) Hot air circulation heating has a large uniform heating effect, while preventing the formation of a heat insulating layer that is generally formed on the surface of the object to be heated, and provides more efficient heating than hot air that constantly circulates over the surface of the object.

Therefore, according to experiments, it is possible to achieve heating that is twice as efficient and three times as fast as a radiant oven.

From this, if microwave heating is used in combination, an extremely useful high-speed cooking device can be obtained.

(2) By discharging hot air from above and below and adjusting the amount of discharge, the doneness of the upper and lower surfaces of the heated object can be freely adjusted.

(3) A single operating rod can perform up/down, top/bottom heating operations, and can be performed with an extremely simple structure.

(4) Delicate degrees of doneness can be easily adjusted by adjusting the air volume control board, and there is no need for conventional upper and lower heaters and a switch to switch between the upper and lower heaters, and it can be done with inexpensive heating or heating.

(5) When microwave heating is used, the dimensions of the suction and exhaust ports can be adjusted appropriately, and the air guide can be configured as a microwave shielding chamber, so microwaves can be used inside the oven and outside the oven. There is no risk of leakage and harm to humans.

In addition, since it is a hot air circulation type, there is no need to install a heating means such as a sheathed heater directly inside the heating chamber, making it extremely easy to design a radio wave seal and providing an inexpensive and highly safe cooking oven. .

[Brief explanation of drawings]

FIG. 1 is a cutaway perspective view of a main part of a hot air circulation type cooking oven showing an embodiment of the invention, and FIG. 2 is a sectional view of the same cooking oven. 1... Heating chamber side wall, 2... Air guide, 3...
Fan, 4...Heater, 5...Intake port, 6...Outlet port, 7...Air volume control board.

Claims (1)

[Claims] 1. A heating chamber for storing food, a high-frequency oscillator for supplying microwaves for dielectric heating into the heating chamber, and a high-frequency oscillator installed at approximately the center of the wall of the heating chamber, and a heater at the peripheral portion of the wall at the center of the wall. comprising a fan that blows intake air from an intake port and sends hot air into the heating chamber from the upper and lower parts, and an air volume control plate interposed between the heater and the hot air outlet,
The hot air circulation type cooking oven is constructed such that the intake port and the exhaust port have opening dimensions that block the microwaves, and the air guide for hot air circulation that houses the fan is made of metal to block the microwaves.