JPH08203668A - Microwave oven - Google Patents

Abstract

PURPOSE: To stably rotate a stirrer fan without requiring an exclusive motor, perform a uniform heating, and reduce the cost by using the driving motor of a turn table also for the drive of the stirrer fan. CONSTITUTION: A driving motor 5 is operated, its driving shaft 6 is rotated to gear and interlock a small gear 13 to a large gear 7 and a large gear 12 to a small gear 8, respectively, whereby a cylinder 14 and a gear body 10 are rotated, respectively, and a stirrer fan 3 and a turn table 2 are rotated together in turn. The angle speed of the stirrer fan 3 is differed from the angle speed of the turn table 2 in a proper gear ratio, whereby the angle speed of the stirrer fan 3 can be properly set so as to be suitable for stirring of radio waves. Thus, the cost of a microwave oven can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive structure for a stirrer fan in a microwave oven.

[0002]

2. Description of the Related Art A stirrer fan is provided in a heating chamber of a microwave oven. Radio waves from the magnetron are reflected and agitated by the star fan so that uneven heating of the food can be avoided. The stirrer fan is driven by a dedicated motor or is rotated by using cooling air of electronic components.

[0003]

However, it is costly to use a dedicated motor for driving the stirrer fan as described above, and when the motor is rotated by cooling air, its rotation is not stable and the radio wave is agitated. There was a problem that the operation was not performed sufficiently.

The present invention has been made in view of the above circumstances, and does not use a stirrer fan as a dedicated fan,
In addition, the purpose is stable driving.

[0005]

According to a first aspect of the present invention, in a microwave oven equipped with a magnetron, a stirrer fan for agitating radio waves from the magnetron, and a turntable on which food is placed, the stirrer fan is the turntable. It is configured so as to be driven by the drive motor of.

According to a second aspect of the present invention, in the first aspect of the invention, the stirrer fan is arranged below the turntable and coaxially with the turntable.

According to a third aspect of the invention, in the second aspect of the invention, a gear mechanism for rotating the stirrer fan and the turntable at different angular velocities is provided.

According to a fourth aspect of the invention, in the second aspect of the invention, a gear mechanism for rotating the stirrer fan and the turntable in different directions is provided.

[0009]

According to the first aspect of the present invention, the stirrer fan is also driven by the drive motor of the turntable.

According to the invention of claim 2, in the invention of claim 1, the stirrer fan is further rotated below the turntable by a drive motor of the turntable.

According to the invention described in claim 3, in the invention described in claim 2, the stirrer fan and the turntable are further rotated at different angular velocities.

According to the invention described in claim 4, in the invention described in claim 2, the stirrer fan and the turntable are further rotated in directions different from each other.

[0013]

1 is a sectional view of a lower portion of a heating chamber of a microwave oven according to the present invention, FIG. 2 is a sectional view showing an essential portion thereof, and FIG. 3 is a plan view of the heating chamber.

Reference numeral 1 denotes a heating chamber, in which a turntable 2 and a stirrer fan 3 are vertically arranged coaxially with each other. The turntable 2 has a mesh structure.

Reference numeral 5 is a drive motor for the turntable 2, and a drive shaft 6 thereof is provided with a large gear 7 and a small gear 8 in two upper and lower stages. Reference numeral 10 denotes a gear body for the turntable 2. A large gear 12 is integrally provided below the shaft portion 11, and the turntable 2 is attached to the upper end of the shaft portion 11. A cylindrical body 14 having a small gear 13 integrated therein is rotatably attached to the lower portion of the shaft portion 11.
A stirrer fan 3 is attached to the upper part of 4.

The small gear 13 is attached to the large gear 7.
However, the small gear 8 and the large gear 12 mesh with each other, and in the meshed state, each gear has a gear case 16
It is housed inside. The drive motor 5 is attached to a lower portion of the gear case 16, and an upper portion of the gear case 16 is attached to a bottom portion of the heating chamber 1 via a bearing body 17, and the bearing body 17 includes a shaft portion 11 of the gear body 10. The portion to which the tubular body 14 is attached is inserted.

With the above-described structure, the drive motor 5 is actuated, the drive shaft 6 thereof is rotated, and the large gear 7 and the small gear 1 are rotated.
3, the small gear 8 and the large gear 12 are meshed with each other, so that the cylindrical body 14 and the gear body 10 rotate, respectively, whereby the stirrer fan 3 and the turntable 2 both rotate.

In this embodiment, the large gear 7 and the small gear 13 are
With the configuration in which the small gear 8 and the large gear 12 are meshed with each other, the stirrer fan 3 is rotated faster than the turntable 2. In this way, the turntable 2 and the stirrer fan 3 are prevented from rotating in synchronization with each other so that the stirrer fan 3 has a good stirring action. When the synchronous rotation is performed, the same portion of the stirrer fan 3 and the mesh portion of the turntable 2 always overlap with each other, so that the stirring action is hindered. Further, by making the angular velocity of the stirrer fan 3 different from the angular velocity of the turntable 2 in an appropriate gear ratio, the angular velocity of the stirrer fan 3 can be appropriately set so as to be good for agitating radio waves.

FIG. 4 shows another embodiment. In this embodiment, a reverse gear 20 is used between the large gear 7 and the small gear 13. With such a configuration, the stirrer fan 3 and the turntable 2 rotate in mutually opposite directions, and the turntable 2 and the stirrer fan 3 do not rotate in the same direction, so that the stirring operation of the stirrer fan 3 is favorably performed. It is configured.

[0020]

According to the first aspect of the present invention, the stirrer fan is stably rotated without the need for a dedicated motor for driving the stirrer fan as in the conventional case.
It became possible to heat evenly, which made it possible to reduce the cost of microwave ovens.

According to the invention described in claim 2, in the invention described in claim 1, since the stirrer fan is provided below the turntable, the space for accommodating the stirrer fan in the conventional heating chamber can be omitted. As a result, A microwave oven that can effectively use the space in the heating chamber is obtained.

According to the invention of claim 3 or 4, in the invention of claim 2, a microwave oven can be obtained in which the stirring action of the stara fan is further favorably performed.

[Brief description of drawings]

FIG. 1 is a sectional view of a lower portion of a heating chamber of a microwave oven according to the present invention.

FIG. 2 is an enlarged cross-sectional view of the main part of FIG.

FIG. 3 is a plan view of the heating chamber.

FIG. 4 is a sectional view of another embodiment.

[Explanation of symbols]

 2 Turntable 3 Starer fan 5 Drive motor

Claims (4)

[Claims] 1. A microwave oven provided with a magnetron, a stirrer fan for stirring radio waves from the magnetron, and a turntable on which food is placed, wherein the stirrer fan is commonly driven by a drive motor of the turntable. .. 2. The microwave oven according to claim 1, wherein the stirrer fan is arranged below the turntable and coaxially with the turntable. 3. The microwave oven according to claim 2, further comprising a gear mechanism that rotates the stirrer fan and the turntable at different angular velocities. 4. The microwave oven according to claim 2, further comprising a gear mechanism for rotating the stirrer fan and the turntable in different directions.