JPS62153Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microwave oven equipped with a stirrer fan that works with a shape memory alloy.

Conventionally, in microwave ovens that cook food using microwave energy, a motor is used to rotate the tray on which the food is placed so that the electric field strength of the microwaves radiated into the heating chamber is evenly irradiated onto the food. Alternatively, the food is fixed and a stirrer fan is rotated in the upper part of the heating chamber so that the microwaves are applied to the food as uniformly as possible. This method of rotating the stirrer fan eliminates the need for a rotating tray, simplifies the structure of the bottom of the heating chamber, and reduces costs, so it is likely to be adopted more frequently in the future. However, in order to rotate the Starer Fan, a special motor is used, or
They also serve as motors for cooling fans, but both have complex structures, making it difficult to significantly reduce costs.

The present invention has been made in view of the above points, and provides a microwave oven in which the stirrer fan is rotated by utilizing the shape memory effect of a shape memory alloy without using any motor to drive the stirrer fan. It is something.

In order to achieve the above-mentioned purpose, this invention attaches a shape memory alloy to the outer periphery of a pulley fixed to a rotating shaft that drives a stirrer fan, and partially heats this shape memory alloy with an oven lamp. , is characterized in that the pulley is rotated.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

Fig. 1 is a schematic front view of a microwave oven showing an embodiment of the present invention with the cabinet, door, operation panel, etc. removed; Fig. 2 is an enlarged view of the main parts of Fig. 1; and Fig. 3: FIG. 3 is a side view of the pulley seen from direction A in FIG. 2;

In the figure, 1 is a microwave oven consisting of a heating chamber 2 for heating food, and a control section 3 consisting of a cooling fan and an operation section (none of which are shown) for cooling electrical components such as a magnetron and a high-voltage transformer.
A side wall 4 of the heating chamber 2 is provided with an air outlet 6 in which a punched hole 5 is formed through which air flows after cooling the magnetron or the like. There is a rotating shaft 9 vertically attached to the top plate 8 of the main body of the microwave oven 1 so as to be rotatable, and a stirrer fan 10 consisting of a propeller fan is fixed at the tip of the rotating shaft 9, and the rotating shaft 9 is arranged in the upper part of the heating chamber 2. has been done. 11 is a first bevel gear fixed to the rotating shaft 9 and rotates in the horizontal direction, and 12 is a second bevel gear that meshes with the first bevel gear 11 and rotates in the vertical direction. It is a shaped gear. 13 is the second bevel gear 12
A pulley having a rotating shaft 14 fixed to it,
The outer periphery of this pulley 13 has a recess 1 all around it.
4, the coiled shape memory alloy 15 is
At normal room temperature, it is housed and held in the recess 14. Reference numeral 16 indicates the center of the pulley 13, and indicates the center of gravity of the pulley 13.
17 is an L-shaped support rod fixed to the top plate 8, the tip of which is connected to the center 1 of the pulley 13.
It is inserted in 6. Reference numeral 18 denotes an incandescent bulb oven lamp that illuminates the inside of the heating chamber 2, and is placed close to a part of the outer circumference of the pulley 13 to partially heat the surface of the coiled shape memory alloy 15. It is becoming possible to do this.

Next, the operation of the embodiment of the present invention having the above configuration will be explained.

First, after placing food (not shown) in the heating chamber 2, when the heating start switch (not shown) is operated, the magnetron (not shown) is turned on, the oven lamp 18 is turned on, and the third As shown in the figure, a force acts on the shape memory alloy 15 heated by the oven lamp 18 to partially return to its original shape, and as shown by arrow B, the shape memory alloy 15 moves toward the pulley. It starts to protrude from the outer periphery. Therefore, as shown in FIG. 3 above, on the heating side of the oven lamp 18, the weight increases by the weight of the heated and protruding shape memory alloy 15, and the left and right balance with respect to the center 16 of the pulley 13 is lost. Therefore, the pulley 13 starts rotating in the direction of arrow C.

Therefore, the rotating shaft 14 and the second bevel gear 12 fixed to the pulley 13 also rotate in the direction of arrow C, and at the same time, the first bevel gear 11 and the rotating shaft 9 rotate in the direction of arrow D. By starting to rotate, the stirrer fan 10 begins to receive rotational force.

In this way, a part of the shape memory alloy 15 housed and held on the outer periphery of the pulley 13 is heated, thereby utilizing the shape memory effect to return to the original shape memorized in a high temperature state. By moving the center of gravity of the body, the balance can be changed and the rotating body can be rotated.

In addition, if the outer periphery of the pulley 13 on the side opposite to the side adjacent to the lamp 18 in FIG. It can become a thing.

As explained above, the present invention consists of a shape memory alloy attached to the outer periphery of a pulley fixed to the rotating shaft of a stirrer fan, and an oven used as a heat source to partially heat the shape memory alloy to illuminate a heating chamber. Since the heat from the lamp is used, there is no need for a motor to rotate the stirrer fan, and the microwave oven is quieter than a motor-driven one and has a simpler structure, thus providing a space-saving and low-cost microwave oven. It has high practical value.

[Brief explanation of the drawing]

Fig. 1 is a schematic front view of a microwave oven showing an embodiment of the present invention, Fig. 2 is an enlarged view of the main parts of Fig. 1, and Fig. 3 is a side view of the pulley seen from direction A in Fig. 2. It is. 1... Microwave oven, 2... Heating chamber, 10... Starer fan, 11, 12... Bevel gear, 13
... Pulley, 14 ... Recess, 15 ... Shape memory alloy, 18 ... Oven lamp.

Claims (1)

[Scope of utility model registration request] A microwave oven characterized by comprising a shape memory alloy attached to the outer periphery of a pulley fixed to the rotating shaft of a stirrer fan, and an oven lamp that partially heats the shape memory alloy.