JPH0119351Y2 - - Google Patents

Description

[Detailed explanation of the idea] (b) Industrial application fields The present invention relates to a microwave oven.

(b) Prior Art In microwave ovens, it is essential to improve uneven heating, and various countermeasures have already been considered and implemented. For example, microwave power is supplied into the heating chamber from multiple microwave power supply ports, and more specifically, microwave power is supplied into the heating chamber from multiple microwave power supply ports via a cross-shaped waveguide. be. With this configuration, heating unevenness has been significantly improved. However, this method is still not sufficient, and therefore, as seen in Utility Model Application No. 171,685/1985, a method in which a microwave stirring stirrer, which is a conventional method, is combined is being considered.

Figures 1 and 2 show such a microwave oven. In the figure, microwaves from a magnetron 1 propagate through a cross-shaped waveguide 2, and are transmitted through a plurality of microwave feed ports 4 and 5 provided at its branches 3 and a central microwave feed port 6 at the intersection. Electricity is supplied into the heating chamber 7. The microwaves supplied in this manner are stirred by a microwave stirring stirrer 8 provided in the heating chamber 7 and rotated by the cooling air of the magnetron 1, thereby further improving uneven heating. . If the stirrer 8 is too large, smooth rotation will not be possible, and the size of the stirrer 8 in this case is as shown by the broken line S in FIG.

However, in such a configuration, the stirrer 8 does not always directly oppose the outermost power feed port 4 of each branch 3 among the power feed ports 4, 5, and 6; The microwaves from the food travel directly and hit the food locally, and in this case, that part of the food is slightly overheated compared to other parts, and some uneven heating remains at this point.

(c) Purpose of the invention The purpose of the invention is to more significantly eliminate uneven heating with a simple structure.

(d) Structure of the invention In order to achieve the above object, the structure of the invention is such that among the plurality of microwave power feed ports, the power feed port that does not directly face the microwave stirrer is more open than all other power feed ports. It is characterized by its small area.

(E) Embodiment Figures 3 and 4 show a microwave oven as an embodiment of the present invention. In the figure, microwaves from a magnetron 9 propagate through a cross-shaped waveguide 10, and a plurality of microwave feed ports 12 provided at its branches 11,
Power is supplied into the heating chamber 15 from the central microwave power supply port 14 at the intersection. The microwaves supplied in this manner are stirred by a microwave stirring stirrer 16 provided in the heating chamber 15 and rotated by the magnetron 9 cooling air. The stirrer is covered with a dielectric cover 17. Here,
The stirrer 16 is connected to the power feed ports 12, 13, 14.
Of these, the outermost power feed port 12 on each branch 11 is not always directly opposed to it (the rotating range of the stirrer 16 is indicated by the broken line S' in FIG. 4), and such a power feed port 12 is , all power supply ports 1 whose width dimension y is other than
It is smaller than the width dimensions x1 and x2 of No. 3 and No. 3 and 14, so that the opening area is naturally smaller than the other widths. For example, x1=30mm and y=15mm.
With such a configuration, even if the microwave from the power supply port 12 goes straight without passing through the stirrer 16 and hits the food locally, the amount of microwaves is equal to that of the microwaves from the other power supply ports 13 and 14. Therefore, it is possible to prevent the food from being locally heated too much by the microwaves from the power supply port 12, even if slightly, and uneven heating can be significantly eliminated.

(f) Effects of the invention According to the invention, among the plurality of microwave power feed ports, the power feed port that does not directly face the microwave stirrer has a smaller opening area than all other power feed ports. It is possible to significantly eliminate uneven heating and obtain an extremely practical microwave oven.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional microwave oven, Fig. 2 is a sectional view taken along the - line in Fig. 1, Fig. 3 is a sectional view of the microwave oven according to the embodiment of the present invention, and Fig. 4 is a sectional view taken along the - line in Fig. 3. It is a diagram. 12, 13, 14...Microwave power supply port, 15...
Heating chamber, 16...starrer.

Claims (1)

[Scope of utility model registration request] In a microwave oven equipped with a microwave stirrer in the heating chamber that receives microwave power from multiple microwave power feed ports, the power feed port that does not directly face the stirrer among the multiple power feed ports is connected to all other power feed ports. A microwave oven characterized by having an opening area smaller than the mouth.