JPS6126802Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a microwave oven equipped with a hot air circulation device.

Conventionally, in a microwave oven equipped with a hot air circulation device, an intake port and a hot air discharge port of the hot air circulation device are provided on the outside of the upper wall of the heating chamber. The object was browned by spraying it onto the upper surface of the object. However, this type of microwave oven has the disadvantage that the hot air is blown only onto the top surface of the object to be heated, and therefore it is difficult to achieve the desired heating when heating the object by blowing hot air over the entire object, so-called oven heating. Was. In addition, when a plurality of objects to be heated are stacked vertically, for example, in two stages,
The hot air hardly hits the heated items on the lower tiers directly, resulting in differences in the cooking results between the upper and lower tiers.

This invention was made in view of this point, and one embodiment will be described below.

1 is an exterior; 2 is a heating chamber formed inside the exterior 1 and whose front surface is closed by an opening/closing door (not shown); 3 is a heating case defining the heating chamber 2;
4 is a magnetron for generating microwaves,
5 faces the magnetron antenna 4a and directs the microwave output from the magnetron 4 to the heating chamber 2.
A waveguide 7 has a tip opening (not shown) provided in the upper wall 6 of the heating chamber so as to introduce the waveguide into the heating chamber 3.
This is a hot air circulation device placed between the exterior housing 1 and the housing 1. As for the configuration of the circulation device, 10 and 15 are an inlet port and a first outlet port provided in the upper wall 6, respectively;
8 is a second discharge port provided in the side wall 9, and 8 is an intake port 10, a first discharge port 15, and a second discharge port 1 provided outside the heating chamber.
1, 12 and 13 are a first blower fan and electric heater arranged in sequence between the intake port 10 and the first discharge port 15 in the duct 8, and 16 is a duct that connects the first discharge port 15 in the duct 8. Second discharge port 1
1, and the duct 8 or the first discharge port 15
A damper device 14 is a second blower fan disposed at the second outlet 11.

In the above embodiment, when cooking with browning is performed, the magnetron 4 is energized to heat the object 17 at high frequency with high frequency, and the first blower fan 12 and electric heater 13 are energized to reach a high temperature. Hot air is generated, the damper device 16 is switched to a position where the duct is closed as shown by the dotted line, and the hot air is discharged from the first discharge port 15 to brown the upper surface of the object to be heated 17.

〓〓〓
Also, when heating in the oven, magnetron 4
energizes the object 17 to be heated at high speed with high frequency, and also energizes the first blower fan 12 and electric heater 13.
is energized to generate high-temperature hot air, and the damper device 16 is switched to a position where the first discharge port 15 is closed and the duct 8 is opened, as shown by the solid line,
The second blower fan 14 is energized and the second outlet 11 is energized.
Hot air is discharged from the heating device to blow the hot air onto the entire object to be heated 17.

The opening and closing of the damper device 16 can be manually switched from the outside by lever operation or the like, or electrically switched by a plunger solenoid device or the like. Furthermore, the presence of the second blowing fan 14 promotes hot air discharge from the second discharge port 11, and is essential from the point of view of the purpose of this invention, which is to blow hot air onto the object to be heated 17 from the side. It's not a thing.

Since this device is constructed as described above, hot air can be blown onto the upper surface of the object to be heated during browning and heating, and hot air can be supplied to the entire object to be heated from the side of the object during oven heating. Moreover, even if the objects to be heated are stacked vertically in multiple tiers, hot air can be directly blown almost evenly onto the objects in each tier, making the finished state of oven cooking almost uniform on each tier. It can be done.

[Brief explanation of the drawing]

The figure is a schematic cross-sectional view of one embodiment of this invention. 2... Heating chamber, 4... Magnetron, 6... Heating chamber upper wall, 8... Duct, 9... Heating chamber side wall, 1
0...Intake port, 11...Second discharge port, 12...First ventilation fan, 13...Heater, 14...Second ventilation fan, 15...First discharge port, 16...
damper device. 〓〓〓

Claims (1)

[Scope of utility model registration request] In a microwave oven equipped with a hot air circulation device that circulates and supplies hot air to a microwave heating chamber, the hot air circulation device includes an inlet and a first outlet provided on an upper wall of the heating chamber, and a side wall of the heating chamber. a second outlet port outside the heating chamber, a duct connecting the respective ports outside the heating chamber, an intake fan and a heater arranged in sequence between the intake port and the first outlet port in the duct, and a first outlet port in the duct. A microwave oven equipped with a hot air circulation device, characterized in that it includes a damper device located between the outlet and the second outlet and selectively closing the duct or the first outlet.