JPH05190272A - Microwave oven - Google Patents

Abstract

PURPOSE:To uniformly and efficiently heat food in various kinds of shape and size regardless of these shape and size. CONSTITUTION:A waveguide 4 is provided in the outside of a heating chamber 1. A moving type partitioning plate 7 is removably mounted to a peripheral wall of the heating chamber 1, in a plurality of positions at different height in the heating chamber 1. The inside of the heating chamber 1 is divided into two upper and lower parts by the partitioning plate 7. A lower surface of the partitioning plate 7 is formed as a microwave reflecting surface. A radiating plate 15 is provided on the lower surface of the partitioning plate. A movable stub 10 for electromagnetically coupling the waveguide 4 to the radiating plate 15 at the time of mounting the partitioning plate 4 is provided in a height position corresponding to each mounting position of the partitioning plate 7 on the peripheral wall of the heating chamber 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave oven.

[0002]

2. Description of the Related Art In order to uniformly and efficiently heat food in a microwave oven, it is necessary to uniformly apply microwaves to the food to be heated. Therefore, conventionally, a microwave is equipped with a stirrer and microwaves are stirred by the stirrer, or a food placing table provided in the heating chamber is made rotatable and the microwave is stirred by rotating the table. I was doing it.

However, in these conventional microwave ovens, the oscillation output of the magnetron fluctuates depending on the shape and type of food, and there is a trade-off relationship between the heating uniformity and the heating efficiency. Difficult to heat.

That is, in the method of stirring the microwave radiated from the waveguide port of the top wall of the heating chamber by the stirrer during cooking, in the case of food which is extremely smaller than the size of the heating chamber, or In the case of thin and wide foods that come to a position away from the tube mouth, uniform and efficient heating cannot be performed. On the other hand, the method of rotating the table on which food is placed during cooking can uniformly and efficiently heat wide and thin foods, but for extremely small foods and high-height foods, this method can be used. Such heating cannot be done. The reason is considered to be that the microwave mode radiated to the heating chamber is limited by the volume and size of the heating chamber.

Therefore, as a microwave oven which solves such a problem, the resonance mode of the heating chamber is changed by elevating and lowering the circular table for placing the food, the food is rotated, and at the portion where the food is present. A microwave oven has been proposed in which the distribution of microwaves is suitable (see Japanese Patent Laid-Open No. 59-71291).

However, since this microwave oven has a structure for raising and lowering the table for placing food, it is necessary to increase the torque of the drive motor in order to rotate the table in a stable state even when the weight of the food is large. is there. Moreover, since the heating chamber has a rectangular parallelepiped shape and the table has a circular shape, a gap is generated between the corner portion of the heating chamber and the table,
As a result, the microwave is coupled to an unnecessary cavity below the table, resulting in loss.

An object of the present invention is to provide a microwave oven which solves the above problems.

[0008]

A microwave oven according to the present invention has a waveguide provided outside a heating chamber, a lower surface serving as a microwave reflecting surface, and heating at a plurality of different height positions in the heating chamber. A movable partition plate that is detachably attached to the peripheral wall of the chamber and divides the heating chamber into two parts, the upper and lower parts.
The radiation plate provided on the lower surface of the movable partition plate and the height position corresponding to each mounting position of the partition plate on the peripheral wall of the heating chamber, and the electromagnetic wave between the waveguide and the radiation plate when the partition plate is mounted. And a movable stub that is mechanically coupled.

[0009]

A waveguide provided outside the heating chamber and a movable partition plate that is detachably attached to the peripheral wall of the heating chamber at a plurality of different height positions inside the heating chamber to divide the heating chamber into two upper and lower portions. And a radiation plate provided on the lower surface of the movable partition plate, and a height position corresponding to each mounting position of the partition plate on the peripheral wall of the heating chamber, and the waveguide and the radiation plate when mounting the partition plate. Since it is equipped with a movable stub that electromagnetically couples, the microwave in the waveguide is transmitted to the radiation plate through the movable stub at any mounting height position of the partition plate, and the partition plate is separated from the radiation plate. It is possible to radiate to a portion below the plate. Therefore, by changing the mounting height position of the movable partition plate according to the shape and size of the food to be heated, the distribution state of microwaves in the food portion can be optimized for that food. Moreover, since the lower surface of the partition plate is the microwave reflecting surface, it is possible to prevent the microwave radiated from the radiation plate from being coupled to the portion above the partition plate.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In addition, in the following description, the left and right of FIGS. 1 to 4 are referred to as the left and right.

FIG. 1 shows the overall structure of the microwave oven, and FIG.
Indicates a part of it. Moreover, FIGS. 3-5 shows a movable partition plate.

In FIGS. 1 and 2, the microwave oven is
A rectangular parallelepiped heating chamber (1), a food placing turntable (3) provided at the lower end of the heating chamber (1) and rotated by a rotation drive mechanism (2), and the heating chamber (1) Right side wall (1a)
The waveguide (4) extending vertically on the outer surface of the magnetron, the magnetron (6) with the antenna (5) protruding at the upper end of the waveguide (4), and the heating chamber (1) A movable partition plate (7) that is detachably attached to the heating chamber (1) at a plurality of different height positions to partition the inside of the heating chamber (1) into upper and lower parts.
It has and.

A plurality of pairs of left and right partition plate support members (8) are provided on the left and right side surfaces of the heating chamber (1) at intervals in the vertical direction. A through hole (1b) is formed in the right side wall (1a) of the heating chamber (1) at a portion slightly above each supporting member (8) on the right side.
Is formed, and the microwave insulator (9) in the shape of a short tube is fitted in the through hole (1b). Left end closure wall of insulator (9)
A movable stub (10) extending in the left-right direction is passed through (9a) so as to be movable in the left-right direction. The length and diameter of the movable stub (10) are designed so as to be in an optimum matching state in a state of being coupled with the radiation plate (15), as will be described later. At the height position corresponding to each movable stub (10), the stub presser bar (11) extending in the left-right direction penetrates the right side wall (4a) of the waveguide (4) so as to be movable in the left-right direction. It is installed in a shape. The stub retainer bar (11) is made of a dielectric material with low loss. A tension spring (12) is installed between the right end flange (11a) of the stub pressure rod (11) and the right side wall (4a) of the waveguide (4).
The movable stub (10) is urged to the left by the stub presser bar (11). Therefore, when the cutting plate (7) is not attached, the flange (10a) at the right end of the movable stub (10) fits inside the insulator (9), and the waveguide (4) and the movable stub (10) are insulated. Then, the electromagnetic coupling between the two is cut off.

The partition plate (7) is supported by the support members (8) that are paired on the left and right at the same height position. The partition plate (7) is made of metal, and the lower surface of the partition plate (7) serves as a microwave reflection surface. The width and depth of the partition plate (7) are almost the same as the width and depth of the heating chamber (1). The partition plate (7) is, as shown in FIGS.
It is fixed to the frame (14) and the frame (14) is a support member.
(8) The partition plate (7) is placed on the heating chamber.
(1) It is designed to be detachably attached inside. On the lower surface of the partition plate (7), the meandering radiation plate (1
5) is attached via a mounting member (16) formed of a dielectric material with low loss. An upper bent portion (15a) is formed on each of the left and right ends of the radiation plate (15), and the upper bent portion (15a) passes through a notch (14a) formed in the frame (14) to form a frame ( It protrudes laterally outward than 14). Partition board
On the upper surface of (7), there is a choke (17) with an outer opening on the outer surface
A frame-shaped choke forming member (18) having is fixed. The opening of the choke (17) is closed by a choke cover (19) made of a dielectric material.

The partition plate (7) is provided with a movable spring stub (10) corresponding to the support member (8) at a height to be attached, and a tension spring (1).
It is mounted in the heating chamber (1) by placing the frame (14) on the support member (8) while moving it to the right against the urging force of 2). The partition plate (7) divides the inside of the heating chamber (1) into two parts, an upper part and a lower part, and a part lower than the partition plate (7) serves as a cooking section. When the force that moves the movable stub (10) to the right is released, the movable stub (10) is moved to the left by the tension spring (12) via the stub pressure rod (11), and its left end is moved. The radiation plate (15) is brought into contact with the upper bent portion (15a). Therefore, the waveguide (4) and the radiation plate (15) are electromagnetically coupled through the movable stub (10), and the microwave radiated from the antenna (5) of the magnetron (6) is emitted by the radiation plate (15). ) And is radiated from the radiation plate (15).

In such a configuration, when cooking food, the mounting height position of the partition plate (7) is changed according to the shape and size of the food placed on the turntable (3), and this state is set. Then, as described above, the microwave is radiated from the radiation plate (15) to the heating and cooking unit below the partition plate (7). Then, this microwave hits the food directly and is reflected by the lower surface of the partition plate (7) to be directed and radiated to the food.The distribution state of the microwave in the area where the food is present shows the shape and size of the food. It will be suitable for. As a result, the food is heated uniformly and efficiently. Further, at this time, the function of the partition plate (7) prevents the microwave from being coupled to a portion above the partition plate (7) in the heating chamber (1), so that the loss is reduced,
The heating efficiency is further improved.

In the above, when the partition plate (7) is mounted in the heating chamber (1), the movable stub (10) may be moved to the right by hand or by using a motor or the like. You may go. In addition, when a cam is provided on the partition plate (7) and the partition plate (7) is fitted into the heating chamber (1),
The movable stub may be moved to the right by the action of this cam. Further, in the above, a stirrer may be provided if necessary.

In the above-mentioned embodiment, the biasing force of the movable stub (10) to the left is given by the tension spring (12), but the present invention is not limited to this. Good.

[0019]

According to the microwave oven of the present invention, as described above, the distribution state of microwaves in the food portion is
Since the food can be optimized according to the shape and size of the food, foods of various shapes and sizes can be uniformly and efficiently heated regardless of the shape and size. Therefore, it is possible to cook with high efficiency without uneven heating. Moreover, due to the function of the partition plate,
Since it is possible to prevent microwaves from being coupled to a portion above the partition plate, the heating efficiency is further improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a microwave oven according to the present invention with a part thereof omitted.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a plan view of a partition plate.

FIG. 4 is a front view of a partition plate.

FIG. 5 is an exploded perspective view of a partition plate.

[Explanation of symbols]

 1 heating chamber 4 waveguide 7 movable partition plate 10 movable stub 15 radiation plate

Claims (1)

[Claims] 1. A waveguide provided outside the heating chamber, a lower surface of which is a microwave reflecting surface, and detachably attached to a peripheral wall of the heating chamber at a plurality of different height positions in the heating chamber for heating. A movable partition plate for partitioning the room into two upper and lower parts, and a radiation plate provided on the lower surface of the movable partition plate,
A microwave oven provided with a movable stub provided at a height position corresponding to each mounting position of the partition plate on the peripheral wall of the heating chamber and electromagnetically coupling the waveguide and the radiation plate when the partition plate is mounted.