JPH0668997B2 - Cooking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a cooker that heats a heater by placing food on a metal turntable.

(B) Conventional Technology An example of a conventional microwave oven is disclosed in Japanese Patent Application Laid-Open No. 61-240591. This is provided with a metal turntable centrally supported only by a rotating shaft of a motor in the lower part of the heating chamber, and a flat heater extending over the entire area is arranged outside the bottom wall of the heating chamber. In such a microwave oven, from the structure in which the heater is arranged on the bottom wall of the heating chamber, the motor cannot be fixed to the bottom wall of the heating chamber because the heater interferes.
Therefore, it has no choice but to fix it on the bottom of the exterior. However, in the structure in which the motor is fixed to the outer bottom surface, it is difficult to correctly align the rotary shaft of the motor with the through hole on the bottom surface of the heating chamber through which the rotary shaft penetrates, and the positions are displaced from each other. Therefore, in order to prevent the rotation shaft and the through hole from interfering with each other, a means of forming the through hole in a relatively large hole is conceivable. However, in such means, radio wave leakage from the gap between the rotation shaft and the through hole is possible. There was a problem that the structure of the countermeasure became complicated. And the cooker which solved the above-mentioned malfunction is FIG. FIG. 8 shows a conventional cooking device as disclosed in Japanese Patent Laid-Open No. 62-12086, in which a metal turntable (2) for placing and rotating food is arranged in the heating chamber (1). The turntable is driven by a motor (3) and is supported by a rotating shaft (5) penetrating the bottom wall (4) of the heating chamber (5) so that the turntable is rotated.
The motor (3) is attached to a motor mounting bracket (7) fixed to the outer surface of the heating chamber bottom wall (4) via a fixing piece (6). On the outer surface of the heating chamber bottom wall (4), a flat heater (8) is arranged outside the fixing piece (6) of the motor mounting bracket (7).

In this case, the turntable (2) is considered to be centrally supported by the rotating shaft (5), and therefore when the food is mainly placed on the periphery of the turntable (2) as shown in the drawing, the rotating shaft (5). Tries to incline due to the force acting in the direction of arrow A.
Here, when the turntable is tilted by the force in the direction of the arrow A, the direction of the radio wave reflected by the turntable is reflected in a direction different from the desired direction, and the radio wave condition in the heating chamber changes. It causes a problem that the cooking condition of food is adversely affected. However, arrow A
Along with the force in the direction, the arrow B from the fixing piece (6) of the motor mounting bracket (7) to the bottom wall (4) of the storage chamber via the motor (3).
A force acts in the direction, but at this time, a reaction force in the direction of arrow C acts, and therefore the inclination of the rotating shaft (5) is suppressed,
It prevents the radio wave condition in the heating room from changing.

Thus, in the above structure, the more the fixing piece (6) of the motor mounting bracket (7) is separated from the rotating shaft (5), the more reliably the inclination is suppressed.

However, in this case, when the fixed piece (6) is separated from the rotating shaft (5), the flat heater (8) arranged outside the fixed piece (6) moves away from the vicinity of the center of the turntable (2), and accordingly, There is a considerable difference in the heat transfer rate between the center and the periphery of the food turntable (2),
Food has uneven heating.

(C) Problem to be Solved by the Invention According to the present invention, by reliably supporting the metal turntable without inclining it, the radio wave condition in the heating chamber can be always stabilized, and uneven food heating occurs. It is intended to provide a cooker capable of suppressing the above.

(D) Means for Solving the Problems As a first configuration of the present invention, a heating chamber, a food turntable metal turntable arranged in the heating chamber, and the heating chamber bottom wall are penetrated. A rotating shaft for supporting and rotating the turntable in the center, a motor for driving the rotating shaft, a motor mounting bracket fixed to the outer surface of the bottom wall of the heating chamber, to which the motor is mounted, A flat heater disposed on the outer surface of the bottom wall of the chamber and arranged outside the motor mounting bracket, forming a plurality of openings in the turntable, and dimensioning the plurality of openings in the center of the turntable; It becomes big as you go.

Further, as a second configuration of the present invention, a heating chamber, a flat heater disposed on the outer surface of the bottom wall of the heating chamber, a metal turntable for rotating food placement disposed in the heating chamber,
The motor includes a rotary shaft that penetrates the heating bottom wall and supports and rotates the turntable in the center, a motor that drives the rotary shaft, and a motor mounting bracket for mounting the motor. The mounting bracket is fixed near the through-hole on the bottom wall of the heating chamber, and the motor mounting bracket is integrally provided with a pressing portion for pressing the flat heater against the bottom wall of the heating chamber at a position around the through-hole. And the planar heater is distributed up to the vicinity of the penetrating portion.

(E) Operation In the first configuration, the heat from the flat heater is usually difficult to transfer to the area near the center of the food turntable, but this area has a large-sized opening in the turntable. The difficulty of transmitting heat as described above is eliminated, and uneven food heating is suppressed. or,
Such uneven heating is suppressed by forming an opening in the turntable as described above. Therefore, as a structure for rotationally supporting the turntable, it is not necessary to take special consideration for suppressing uneven heating. It is possible to adopt a structure that can reliably support the turntable without inclining it regardless of the peripheral arrangement of the food.

Further, in the second configuration, since the planar heater is arranged up to the vicinity of the penetrating portion through which the rotary shaft of the turntable penetrates, the heater heat is well transmitted to the food near the center of the turntable, and the uneven heating of the food occurs. Is suppressed. Further, the mounting bracket of the motor for driving the rotating shaft is fixed near the penetrating part, and the pressing part for pressing the flat heater against the bottom wall of the heating chamber is integrally formed around the penetrating part. Therefore, when food is placed around the turntable, the force due to this acts on the bottom wall of the heating chamber from the pressing part via the flat heater, but in this case, the reaction force acts from the bottom wall of the heating chamber. Therefore, the turntable is securely supported without tilting.

(F) Embodiment FIG. 1 to FIG. 4 show a cooker according to a first embodiment of the present invention. The cooking device relates to a toaster microwave oven having a toast function, which has recently been in the spotlight.

A heating chamber (11) is arranged in the cooker main body (10), and a door (12) for opening and closing a front opening of the heating chamber (11) and an operating section (13) are provided on the front surface of the main body (10). Are arranged. Microwaves are supplied from the magnetron (15) into the heating chamber (11) through the waveguide (14), and a glass tube heater (17) outside the upper wall (16) of the heating chamber (11). Heat is supplied from the flat heater (19) arranged on the outer surface of the bottom wall (18) of the heating chamber (11). The glass tube is provided with a heat reflection plate (20) for the heater (17), and a heat insulating plate (21) and a heat insulating material (22) for the flat heater (19).
Is provided.

Further, a metal turntable (23) for rotating food placement is arranged in the heating chamber (11). The turntable (23) is driven by a motor (24), and is centrally supported and rotated by a ceramic rotation shaft (25) penetrating the heating chamber bottom wall (18). The motor (24) is attached to a motor mounting bracket (27) fixed to the outer surface of the heating chamber bottom wall (10) via a fixing piece (26). Then, on the outer surface of the heating chamber bottom wall (18), the motor mounting bracket (2
The planar heater (19) is arranged outside the fixing piece (26) of (7).

In this case, the turntable (23) is considered to be centrally supported, so that the food product will be the turntable (23) as shown.
When the rotary shaft (25) is mainly mounted on the periphery of the rotary shaft (25), the rotary shaft (25) tends to incline due to the force in the direction of arrow A. Along with this force, a force in the direction of arrow B acts on the heating chamber bottom wall (18) from the fixing piece (26) of the motor mounting bracket (27). However, at this time, a reaction force in the direction of the arrow C acts, so that the inclination of the rotating shaft (25) is suppressed.

Therefore, in the above structure, the fixing piece (26) is fixed in view of the fact that the inclination is more reliably suppressed as the fixing piece (26) of the motor mounting bracket (27) is farther away from the rotating shaft (25). Are well separated.

On the other hand, due to such separation, the flat heater 19) arranged outside the fixed piece (26) is moved away from the vicinity of the center of the turntable (23), and therefore the food is turned on the turntable (2).
There is a considerable difference in the degree of transfer of the heater heat from the flat heater (19) between the vicinity of the center and the vicinity of the periphery of (3), which may cause uneven heating of the food due to the heater heat.

For this, the following measures are taken. That is,
As described above, the turntable (22) is not related to the structure for securely supporting the turntable (23) without tilting it.
3) Regarding itself, a plurality of openings (28) are formed in the turntable (23), and the dimensions of these openings (28) are increased toward the center of the turntable (23).
Therefore, the vicinity of the center of the turntable (23) is moved away from the flat heater (19), and it is usually difficult for heat to be transmitted to the food near this center, but a large size opening is formed in the turntable (23) near where heat is difficult to transmit. By forming (28)), the difficulty of heat transfer is remarkably eliminated, and thus uneven food heating due to heater heat is suppressed.

Further, as described above, in the configuration in which the size of the opening (28) is increased toward the center of the turntable (23), more microwaves pass through the central opening (28). Generally, when a large food is placed on a metal turntable without such an opening and heated by microwaves, it is difficult for the lower part of the food near the center of the turntable to be heated by microwaves. By providing (28), microwaves are also radiated from below through the opening (28) to the lower portion of the food that is difficult to be heated, and therefore the food is uniformly heated by microwaves.

FIGS. 5 to 7 show a cooker according to a second embodiment of the present invention. Only the parts different from the first embodiment will be described, but the metal turntable (23) has no opening.
The motor mounting bracket (27) is fixed to the heating chamber bottom wall (18) near the penetrating portion of the rotating shaft (25) via a fixing bracket (29). The fixing fitting (29) integrally has a microwave seal pipe (30) through which the rotating shaft (25) is inserted. The motor mounting bracket (27) has a flat heater (19) at the peripheral position of the penetrating portion and a heating chamber bottom wall (1).
It has four pressing parts (31) that press against 8). The pressing section (31) may be one that presses the flat heater (19) through a heat insulating plate (21) covering the flat heater (19) and a heat insulating material (22). At this time, the planar motor (19) is distributed up to the vicinity of the penetrating portion.

In this case, when food is placed on the peripheral portion of the turntable (23) as shown in the figure, the rotating shaft (25) similarly tends to tilt due to the force in the direction of arrow A. Along with this force, a force in the direction of arrow B acts on the heating chamber bottom wall (18) from the pressing portion (31) of the motor mounting bracket (27). However, at this time, the reaction force in the direction of the arrow C acts in the same manner, and accordingly, the rotating shaft (2
The inclination of 5) is suppressed and the turntable (23) is securely supported without inclination.

Further, since the planar heater (19) is distributed up to the vicinity of the penetrating portion, the heater heat is well transmitted to the food near the center of the turntable (23), and uneven heating of the food due to the heater heat is suppressed. To be done. In this case, the vicinity of the penetrating portion of the flat heater (19) is pressed against the heating bottom wall (18) by the pressing portion (31) and is in close contact with the bottom wall (18),
Therefore, the heat of the heater is efficiently transferred to the food.

Further, in the motor mounting bracket (27), the peripheral edge of the through hole (32) through which the rotating shaft (25) penetrates is bent upward to form a flange (33), and the through hole (32) is rotated. The moving shaft (25) is covered with a Teflon ring (34) that is tightly fixed. Further, the motor mounting bracket (27) has a rectangular shape, and the longitudinally extending portion (35) thereof is the motor (24).
The groove (36) is formed by reaching the outer side of and bending downward there. Both ends of the concave groove (36) are open.
Therefore, for example, when a large amount of water is spilled in the heating chamber (11), the water passes through the pipe (30) as shown by an arrow W and is surrounded by the ring (34) around the motor mounting bracket (27). After that, the water flows through the concave groove (36) and is discharged from its end portion to a predetermined place, thereby preventing the water from splashing on the motor (24).

(G) Effect of the Invention According to the present invention, since it is possible to employ a structure that can reliably support the metal turntable without tilting, it is possible to prevent changes in the radio wave state in the heating chamber due to tilting of the turntable, and The heat from the flat heater is evenly transmitted to the food, and the food can be evenly heated by the heater.

[Brief description of drawings]

1 to 4 show a cooking device according to a first embodiment of the present invention, FIG. 1 is an external perspective view, FIG. 2 is a sectional view, and FIGS. 3 and 4 are plan views of a turntable and Sectional views, FIGS. 5 to 7 show a cooking device according to a second embodiment of the present invention, FIG. 5 is a sectional view of essential parts, FIG. 6 is a sectional view taken along line VI-VI of FIG. 5, and FIG.
The figure is an exploded perspective view of essential parts, and FIG. 8 is a sectional view of a conventional cooker. (11) …… Heating chamber, (19) …… Flat heater, (23) ……
Metal turntable, (24) …… motor, (25) ……
Rotation axis, (27) …… Motor mounting bracket, (28) …… Opening,
(31) …… Pushing section.

Claims (2)

[Claims] 1. A heating chamber, a turntable made of metal for rotating foods placed in the heating chamber and a bottom wall of the heating chamber which penetrates through the heating chamber and supports the turntable in the center to rotate the turntable. A driving shaft, a motor for driving the rotating shaft, a motor mounting bracket fixed to the outer surface of the heating chamber bottom wall and mounted with the motor, and a motor mounting bracket located on the outer surface of the bottom wall of the heating chamber. A cooker comprising: a flat heater arranged outside; a plurality of openings are formed in the turntable; and the dimensions of the plurality of openings are increased toward the center of the turntable. 2. A heating chamber, a flat heater disposed on the outer surface of the bottom wall of the heating chamber, a metal turntable for rotating food placement disposed in the heating chamber, and a penetrating through the heating chamber bottom wall. A rotary shaft for supporting and rotating the turntable in the center, a motor for driving the rotary shaft, and a motor mounting tool for mounting the motor. The bottom wall is fixed near the penetrating part, and the motor mounting bracket is integrally provided with a pressing part that presses the flat heater against the heating chamber bottom wall at a position around the penetrating part. A cooking device characterized in that a heater is distributed up to the vicinity of the through portion.