JP2002141166A - Cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cook foods with no heating irregularity and without any wasteful installation space in a low-cost cooker having two magnetrons. SOLUTION: This cooker for heating a heating object 5 in a heating chamber 3 by alternately oscillating the two magnetrons 6 and 7 aligned in a side of the heating chamber 3, is provided with a single rotating blade 8 irregularly reflecting a microwave irradiated from antenna caps 6a and 7a in the adjacent to the antenna caps 6a and 7a of the two magnetrons 6 and 7. The rotation axis of the rotating vane 8 is disposed in the intermediate position of the two magnetrons 6 and 7, and the outside diameter of the rotating vane 8 is set to such a dimension that its outer circumferential locus of the rotating arc passes through a part of the two antenna caps 6 and 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking device for performing cooking by microwave. Examples of the heating cooker include a microwave oven and an electronic microwave oven.

[0002]

2. Description of the Related Art A microwave oven heats food by irradiating microwaves generated from a magnetron to food stored in a heating chamber. In order to obtain large power, a microwave oven using two magnetrons is used. is there.

In this case, magnetrons are often arranged side by side, and a region where microwaves radiated from two magnetrons overlap is generated, and the heating capacity in that region increases as compared with other regions, resulting in uneven heating. Will occur.

[0004] On the other hand, a blade rotated by a motor is attached to the antenna cap of each magnetron, and the microwaves radiated from the two magnetrons are radiated in a random manner, so that the microwaves are partially generated in the heating chamber. It is conceived to prevent the user from concentrating on.

[0005]

According to the above-described conventional example, two sets of elements for rotating the antenna are required, so that the cost is increased and the rotation radius is required to be increased. Is increased.

[0006] In view of such circumstances, an object of the present invention is to provide a cooking device having two magnetrons that can perform cooking without uneven heating without requiring an inexpensive and wasteful installation space. I have.

[0007]

A first cooking device according to the present invention heats an object to be heated in a heating chamber by alternately oscillating two magnetrons arranged side by side on the heating chamber. In the vicinity of the antenna caps of the two magnetrons, a single rotating blade for irregularly reflecting the microwave radiated from the antenna cap is provided, and the rotation axis of the rotating blade is arranged at an intermediate position between the two magnetrons. And the outer diameter of the rotating blade is
The outer circumference locus of the rotating arc is set to a size passing through a part of the two antennas.

[0008] The second cooking device according to the first aspect of the present invention, in the first configuration, prevents contamination of the rotating blades and allows passage of microwaves irregularly reflected by the rotating blades into the heating chamber rather than the rotating blades. Protection plate is provided,
It is characterized by:

A third cooking device according to the present invention, in the above-mentioned second configuration, further comprises a heater for radiating radiant heat into the heating chamber on a side of the heating chamber opposite to a side where the magnetron is installed. The protection plate is made of ceramics, and the rotating blades are formed in a propeller shape that exerts a blowing action with rotation.

According to a fourth aspect of the present invention, in the cooking device according to any one of the first to third aspects, the rotating blade is disposed in a convex wall bulging outward on a side surface of the heating chamber. The protection plate is disposed on the opening side of the convex wall, and a gap is secured between the outer periphery of the protection plate and the opening of the convex wall.

[0011] The fifth cooking device of the present invention is characterized in that the convex wall included in the fourth configuration is provided with an exhaust hole and an intake hole communicating with the outside.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described based on embodiments shown in the drawings.

Here, a microwave oven is taken as an example of the heating cooker. As shown in FIG. 1, the microwave oven according to this embodiment has a configuration in which a front door 2 is provided on a front surface of a case 1, and a heating target 5 placed on a turntable 4 in a heating chamber 3 is provided. Heat cooking by irradiating microwaves or radiant heat.

In this embodiment, as shown in FIG.
The configuration is such that a large power is generated using the two magnetrons 6 and 7, and the power of the two magnetrons 6 and 7 is devised so as to be distributed over a wide area in the heating chamber 3, thereby heating the object 5 to be heated. I try to prevent unevenness. This will be specifically described below.

On one side surface of the heating chamber 3, two magnetrons 6, 7 are arranged vertically.

A side wall on which the magnetrons 6 and 7 are installed is provided with a convex wall 3a which bulges outward, and the magnetrons 6 and 7 are attached to the convex wall 3a in a horizontal position. ing. The antenna caps 6a and 7a of the magnetrons 6 and 7 protrude into the heating chamber 3 from the convex wall 3a. The convex wall 3a is provided with an intake hole 3b and an exhaust hole 3c.

At the opening of the convex wall 3a on the side of the heating chamber 3, the antenna caps 6a, 7 of the magnetrons 6, 7 are respectively provided.
A single aluminum rotating blade 8 that irregularly reflects the microwave radiated from a is provided. When the rotating blade 8 is rotated by the motor 9, the microwave generated from the two magnetrons 6 and 7 is generated. The radiation is scattered over a wide area in the heating chamber 3.

The axis of rotation of the rotary blade 8 is arranged at an upper and lower intermediate position between the two magnetrons 6 and 7, and the outer diameter of the rotary blade 8 is such that the outer trajectory of the rotary arc is two.
When the distance between the centers of the two antenna caps 6a and 7a is set to be substantially the same as or larger than the distance between the centers, the outer circumference trajectory of the rotating arc passes through a part of both antenna caps 6a and 7a.

In the opening of the convex portion 3a on the side of the heating chamber 3, dirt is attached to the rotating blade 8 and the antenna cap 6 due to cooking.
a, 7a to prevent adhesion to the rotating blades 8
A protective plate 10 made of ceramics is provided to allow the passage of microwaves that are irregularly reflected by the ceramic. The outer diameter of the protective plate 10 is set smaller than the outer diameter of the opening of the convex wall 3a, so that a required gap is secured between the protective plate 10 and the opening of the convex wall 3a.

A heater 11 for radiating radiant heat into the heating chamber 3 and a convection fan 12 are provided on the side opposite to the side on which the magnetrons 6 and 7 are installed. By arranging the heater 11 in this way, the degree of freedom in designing the shape of the heating chamber 3 can be increased.

When the heater 11 is provided,
The protective plate 10 made of ceramics is heated by the radiant heat from the heater 11. In particular, when the heater 11 is arranged in a form facing the magnetrons 6 and 7 as described above, the protective plate 10 Is excessively heated, and the temperature easily rises. Incidentally, if the temperature of the ceramic protection plate 10 rises, it is not preferable because the microwaves absorb microwaves and easily generate heat, and the microwave permeability decreases. In consideration of this, the rotary blade 8 is formed in a propeller shape that exerts an air blowing action with rotation, and is configured to cool the protection plate 10 by the wind generated by the rotary blade 8. are doing.

With the configuration described above, microwave cooking and grill cooking can be performed. In particular, in microwave cooking, the microwaves generated from the two magnetrons 6 and 7 rotate the rotating blade 8. As a result, the light is diffusely reflected, passes through the protection plate 10, passes through the gap between the opening of the convex wall 3 a and the protection plate 10, and is dispersed and incident on a wide area in the heating chamber 3. Therefore, the heating target 5 stored in the heating chamber 3 is uniformly heated from the entire surface, and is cooked with a good finish without uneven heating.

By the way, as shown in FIG. 3, the driving devices for the two magnetrons 6 and 7 in the microwave oven are roughly divided into two oscillating circuits 20 and 30,
It includes a control device 40 and a commercial power supply 50. In addition, 51 is a door switch, 52 is a monitor switch, 53 and 54 are thermal protectors, 55 is an interior light, and 56 is a fan motor for cooling the magnetrons 6 and 7.

The first and second oscillating circuits 20 and 30 boost the AC voltage of 100 V from the commercial power supply 50 to, for example, 2 kV by the high voltage transformers 21 and 31 and generate the AC voltage generated on the secondary coil side of the high voltage transformers 21 and 31. To high voltage diodes 22 and 3
2, oscillates by generating a doubled voltage of as much as 4 kV by charging the high-voltage capacitors 23 and 33 and applying it to the magnetrons 6 and 7.

The control device 40 is composed of a microcomputer or the like, and manages processing relating to the operation of each component relating to the heating and cooking of the object 5 to be heated. During heating cooking, the two magnetrons 6 and 7 are alternately oscillated at required timing.

In the illustrated example, the power supply from the commercial power supply 50 to the two oscillation circuits 20 and 30 is performed separately via the first and second power supply lines 61 and 62. The power supply to the control device 40 is performed from the commercial power supply 50 via a branch line 63 connected in parallel to a first power supply line 61 for the first oscillation circuit 20.

The first and second power supply lines 61 and 6
2 is provided with fuses 64 and 65 for circuit protection and a kindness function against the following failures.

First, as a first virtual phenomenon, if an abnormality occurs in the device and the fuse 64 inserted in the second power supply line 62 is blown, the second power supply line 62
Although the power supply to the first power supply line 61 is stopped and the driving of the second oscillation circuit 30 is stopped, the power supply of the first power supply line 61 is normally performed, so that the driving of the first oscillation circuit 20 and the control device 40 is stopped. To be continued. However, although the output may decrease due to the non-driving state of the second oscillation circuit 30 and the cooking may be incomplete, the control device 40 can cope with the problem so that the user can be notified of the occurrence of the failure. Absent.

As a second virtual phenomenon, when an abnormality occurs in the device and the fuse 63 inserted into the first power supply line 61 is blown, the power supply to the first power supply line 61 is cut off. Since the power supply to the branch line 63 is also cut off, the driving of the first oscillation circuit 20 is stopped and the function of the control device 40 is also stopped.
Therefore, although the power supply of the second power supply line 62 is normally performed, the drive of the second oscillation circuit 30 is stopped due to the stoppage of the function of the control device 40, and the output stops. In such a case, the user can clearly confirm the failure, but does not know that the power is supplied halfway through the second power supply line 62. In such a situation, when repairing the equipment, it is not preferable because the repairer may touch the second power supply line 62 and receive an electric shock.

Therefore, in the above-mentioned driving device, A is provided near the connection between the first power supply line 61 and the branch line 63.
The C relay 64 is inserted and the AC relay 64 is inserted.
A normally closed relay switch 65 that is turned on when the power supply to the power supply is cut off, and a warning lamp 66 that is turned on when the relay switch 65 is turned on, are inserted into the second power supply line 61.

Thus, when the above-described second virtual phenomenon occurs, the current to the AC relay 64 is cut off with the blowing of the fuse 63 inserted into the first power supply line 61. Is turned on, and the warning lamp 66 is lit. Therefore, when repairing the device, the repairer can know that the power is being supplied halfway through the second power supply line 62, and it is possible to prevent an electric shock.

In addition, if the inner surface of the door 2 in the above-mentioned microwave oven becomes dirty with use, the user wipes the dirt with a detergent. The detergent causes the following problems. .

That is, as shown in FIG. 4, the door 2 is provided with a large number of punching holes in a dot matrix in order to make the heating chamber 3 easy to see in the intermediate bulging area 2d and to prevent microwave leakage. Door body 2a, a choke dielectric 2b having a window 2e opening corresponding to the middle bulging area 2d, and a transparent body pasted in a form that covers the middle bulging area 2d and closes the punching hole in the door body 2a. And a sheet 2c made of a suitable polyester film.

The size of the sheet 2c is set so as to cover only the intermediate bulging area 2d.
The four edges of c are exposed from the window 2e of the choke dielectric 2b.

Due to such a configuration, when the inner surface of the door 2, that is, the choke dielectric 2b and the sheet 2c are wiped with a detergent or the like, the detergent easily permeates the four edges of the sheet 2c. When the detergent is soaked repeatedly, the sheet 2c is easily peeled off.

Therefore, in this embodiment, as shown in FIG. 5, the sheet 2c has an outer shape sufficiently larger than the intermediate bulging area 2d, and the four edges of the sheet 2c are formed on the frame portion of the choke dielectric 2b. It is designed to be hidden.

More specifically, the sheet 2c is adhered in such a manner that the edges of the four sides of the door body 2a protruding from the intermediate bulging area 2d are bent so as to go around the square cylindrical wall surface of the intermediate bulging area 2d. Accordingly, the four edges of the sheet 2c are hidden by the frame portion of the choke dielectric 2b. In addition, the four corners of the sheet 2c are cut off in order to eliminate slack when bending.

In this way, even if the inner surface of the door 2 is wiped with a detergent, the detergent does not touch the four edges of the sheet 2c at all, so that the detergent permeates into the sticking surface from the edges. Disappears. Therefore, peeling of the sheet 2c can be semi-permanently prevented.

It should be noted that the present invention is not limited to only the above embodiment, and various applications and modifications are conceivable.

For example, as shown in FIG. 6, two magnetrons 6 and 7 are arranged on one side of the heating chamber 3, and a microwave generated from one of the magnetrons 6 is supplied to the heating chamber 3 through a waveguide 14. There is a configuration in which the light is incident from the ceiling wall side and a microwave generated from the other magnetron 7 is incident from the bottom wall side of the heating chamber 3 via the waveguide 15.

The microwaves propagating through the two waveguides 14 and 15 are individually rotated by the motors 9 and 9 at the openings of the two waveguides 14 and 15 in order to diffusely reflect the microwaves into the heating chamber 3. The blades 8, 8 are installed.

In such a configuration, discharge may occur between the opening edge of the ceiling wall and the metal rotary shafts 8a, 8a of the rotary blades 8, 8, so the following configuration is used. ing.

That is, first, as shown in FIG. 7, the rotating blades 8, 8 and the metallic rotating shafts 8a, 8a are connected to the two waveguides 14,
Sliding bearings 16 and 1 made of fluororesin in the openings 15
The rotating blades 8 are attached to portions of the rotating shafts 8a protruding into the heating chamber 3 on the rotating shafts 8a.

When mounting the sliding bearings 16 on the opening of the ceiling wall of the heating chamber 3, the bent pieces 3d, 3d bent outward in the opening of the ceiling wall are formed by burring, and the sliding is performed. Bearing 1
6, 16 are provided with annular concave grooves 16a on the lower surface, and sliding bearings 16, 1 are formed on the bent pieces 3a, 3a of the ceiling wall.
6 are fitted in the annular grooves 16a, 16a. In this way, not only can the slide bearings 16 and 16 be easily positioned, but also the spacing between the opening edge of the ceiling wall and the metal rotary shafts 8a can be increased, and the slide made of a synthetic resin material can be used. Since the bearings 16, 16 can insulate, it is possible to prevent the occurrence of discharge there.

[0045]

According to the first to fifth aspects of the present invention, in a heating cooker having two magnetrons, two extra components can be used without securing extra installation space as in the conventional example. Since the microwave generated from the magnetron can be dispersed and incident over a wide area in the heating chamber, the object to be heated housed in the heating chamber can be uniformly heated from the entire surface, and a good finish without uneven heating Can be cooked.

In particular, according to the second aspect of the present invention, during the heating operation, water, oil, etc., released from the object to be heated, etc.
As a result, it is possible to avoid contamination from being attached to the rotating blades or the magnet cap of the magnetron, and it is possible to maintain cleanliness for a long period of time, thereby improving usability.

According to the third aspect of the present invention, grill cooking using a heater is possible, and even if the radiant heat of the ceramic protection plate causes the protection plate to be heated by air, the protection plate may be heated by rotating blades. As a result, the durability of the protection plate can be ensured, and the phenomenon that the microwave permeability of the protection plate made of ceramics is reduced due to an increase in temperature can be avoided.

According to the fourth aspect of the present invention, there is obtained an advantage that projections are eliminated in the heating chamber, the appearance is improved, and the accommodation volume of the object to be heated can be increased.

According to the fifth aspect of the present invention, the wind when cooling the protection plate by the rotating blades can be efficiently taken in from the outside instead of from the heating chamber, and the hot air generated by cooling the protection plate can be removed. The cooking can be prevented from being adversely affected, such as being able to efficiently exhaust to the outside.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a microwave oven according to an embodiment of the present invention.

FIG. 2 is an exemplary front view showing the internal configuration of the microwave oven shown in FIG. 1;

FIG. 3 is a diagram showing a circuit configuration of the microwave oven of FIG. 1;

FIG. 4 is an exploded perspective view of the door of FIG.

FIG. 5 is a perspective view showing how a seat is attached to the door of FIG. 1;

FIG. 6 is a front view showing the internal configuration of a microwave oven according to a modification of the present invention.

FIG. 7 is an enlarged view of a part of FIG. 6;

[Explanation of symbols]

 Reference Signs List 3 heating chamber 5 heating object 6,7 magnetron 6a, 7a antenna cap 8 rotating blade 9 motor 10 protection plate 11 heater

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F24C 7/02 531 F24C 7/02 531B 541 541C H05B 11/00 H05B 11/00 Z (72) Inventor Ueda Kazuhiro F-term (reference) 2-5-5 Keihanhondori, Moriguchi-shi, Osaka 3K086 AA01 AA02 AA05 BA02 BA05 BA08 DA06 DB02 3K090 AA01 AA04 AA05 AA06 AA15 AB02 BA01 BA08 BA09 BB03 BB05 CA08 DA15 DA16 DA19 EB26 EB27 3L086 AA01 AA03 BA05 BB02 BB04 BB07 BC01 BC07 BE02 CC22 DA12 DA19 DA21 DA29

Claims (5)

[Claims] 1. A heating cooker for heating an object to be heated in a heating chamber by alternately oscillating two magnetrons arranged side by side on a side of the heating chamber, the heating cooker being provided near an antenna cap of the two magnetrons.
A single rotating blade for irregularly reflecting microwaves radiated from the antenna cap is provided. The rotating axis of the rotating blade is arranged at an intermediate position between the two magnetrons, and the rotating shaft is located outside the rotating blade. A heating cooker, wherein a diameter dimension is set to a size such that an outer trajectory of the rotating arc passes through a part of the two antennas. 2. The cooking device according to claim 1, further comprising a protection plate provided in the heating chamber rather than the rotating blades, the protection plate preventing contamination of the rotating blades and allowing passage of microwaves irregularly reflected by the rotating blades. A cooking device characterized by the following. 3. The heating cooker according to claim 2, further comprising a heater for radiating radiant heat into the heating chamber on a side of the heating chamber opposite to a side on which a magnetron is installed, wherein the protection plate comprises: A heating cooker made of ceramics, wherein the rotating blades are formed in a propeller shape that exerts a blowing action with rotation. 4. The cooking device according to claim 1, wherein the rotating blades are arranged in a convex wall bulging outward on a side surface of the heating chamber, and the protection plate is provided with A heating cooker which is arranged on the opening side of the convex wall and has a gap secured between the outer periphery of the protection plate and the opening of the convex wall. 5. The cooking device according to claim 4, wherein the convex wall is provided with an exhaust port and an intake port communicating with the outside.