JPH05322187A - Microwave oven - Google Patents

Abstract

PURPOSE:To simplify a structure while securing highly efficient cooling of magnetrons by establishing a cooling path independent of the magnetrons in a microwave oven having the two magnetrons. CONSTITUTION:This apparatus is provided with first and second magnetrons 6a and 6b, first and second coolers 7a and 7b to supply cooling air to the first and second magnetrons 6a and 6b and a second duct structural body which is made up of an integration of a second exhaust duct 9b for introducing cooling air after the cooling of the first magnetron 6a and a second suction duct 8b for introducing the cooling air from the second cooler 7b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave oven having a plurality of microwave generators such as magnetrons.

[0002]

2. Description of the Related Art In a microwave oven having a plurality of magnetrons, for example, two, as disclosed in Japanese Patent Laid-Open No. 63-193489, a cooling device for supplying cooling air to the magnetrons for each magnetron, and cooling from this cooling device. By providing an intake duct that guides the wind to the magnetron and an exhaust duct that guides the cooling wind after cooling the magnetron, and establishing independent cooling paths, each magnetron can be cooled efficiently. On the other hand, a cooling device, an intake duct, and an exhaust duct must be provided for each magnetron, which complicates the structure.

[0003]

SUMMARY OF THE INVENTION According to the present invention, in a microwave oven having a plurality of microwave generators, an independent cooling path is established for each microwave generator to efficiently cool each microwave generator. It aims to simplify the structure while ensuring it.

[0004]

A first microwave oven according to the present invention comprises a first microwave generator and a second microwave generator, and the first and second microwave generators.
A first microwave generator for supplying cooling air to each of the first and second microwave generators;
A second cooling device, an exhaust duct for guiding the cooling air after cooling the first microwave generator, and an intake duct for guiding the cooling air from the second cooling device to the second microwave generator are integrally formed. And the duct structure. Further, in the duct structure, the partition portion that partitions the exhaust duct and the intake duct has low thermal conductivity.

Further, the second microwave oven includes a microwave generator, a cooling device for supplying cooling air to the microwave generator, and an intake duct for guiding the cooling air from the cooling device to the microwave generator. And a duct structure integrally formed with an exhaust duct,
A second unit is provided and the microwave generator of the first unit is connected to the exhaust duct of the second unit.

[0006]

In the first microwave oven, the cooling paths of the respective microwave generators are independent from each other, and the respective microwave generators can be efficiently cooled, and the intake duct and the exhaust duct are separated by the duct structure. The structure is simple because it is integrated. In addition, since the partition part that separates the intake duct and the exhaust duct has low thermal conductivity, the heat of the hot air passing through the exhaust duct is suppressed from being transferred to the cooling air passing through the intake duct.

In the second microwave oven, the microwave generator, the cooling device, and the duct structure in which the intake duct and the exhaust duct are integrally formed are unitized for each microwave generator. This simplifies assembly.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A microwave oven according to an embodiment of the present invention will be described with reference to the drawings. In the microwave oven main body 1, a heating chamber 3 whose front opening is opened and closed by a door 2 and an electrical equipment chamber 4 are formed adjacent to each other. Inside the electrical equipment chamber 4, first and second waveguides 5a and 5b connected to the upper right side surface of the heating chamber 3,
First and second magnetrons 6a and 6b for supplying microwaves into the heating chamber via these waveguides 5a and 5b, and first and second sirocco fan type cooling for supplying cooling air to these magnetrons 6a and 6b. Devices 7a and 7b, first and second intake ducts 8a and 8b, and first and second exhaust ducts 9
a, 9b, and first and second high voltage transformers 10a, 10b for supplying high voltage to the magnetrons 6a, 6b are provided.

The first and second intake ducts 8a and 8b use the cooling air from the first and second cooling devices 7a and 7b as the first and second cooling air.
Guide to the magnetron 6a 6b, and then the second exhaust duct 9
b is for guiding the wind after cooling the first magnetron 6a. The first exhaust duct 9a is not used in this case.

Then, the flow of the cooling air will be specifically described. When the first cooling device 7a is driven, cooling air is generated as shown by an arrow A, and this cooling air A passes through the first cooling device 7a after cooling the first high-voltage transformer 10a, and then the first cooling device 7a.
It reaches the first magnetron 6a via the intake duct 8a and cools this magnetron. After cooling the first magnetron 6a, the cooling air A reaches the inside of the heating chamber 3 through the second exhaust duct 9b and the auxiliary duct 11 connected to this duct 9b.

When the second cooling device 7b is driven, cooling air is generated as shown by an arrow B, and the cooling air B passes through the second cooling device 7b after cooling the second high-voltage transformer 10b, and then the second cooling device 7b. It reaches the second magnetron 6b through the two intake ducts 8b and cools this magnetron. After the second magnetron 6b is cooled, the cooling air B passes through another auxiliary duct 12, a part of which reaches the inside of the heating chamber 3 and the rest is discharged to the outside.

In such a structure, the cooling paths of the magnetrons 6a and 6b, that is, the cooling airflow paths A and B are substantially independent of each other, and the magnetrons 6a and 6b are substantially independent of each other.
Can be cooled efficiently.

Then, the second exhaust duct 9b for guiding the air after cooling the first magnetron 6a and the second air for guiding the cooling air from the second cooling device 7b to the second magnetron 6b.
The intake ducts 8b are integrated with each other to form a second duct structure 12b made of resin. This simplifies the structure. The first intake duct 8a and the first exhaust duct 9a, which guide the cooling air from the first cooling device 7a to the first magnetron 6a, are also integrated with each other to form a resin-made first structural body 12a.

Further, in the second structure 12b, the partition portion 13 provided for partitioning the second exhaust duct 9b and the second intake duct 8b is made of resin and is thick and has low thermal conductivity. , The heat of the cooling air A that has passed through the second exhaust duct 9b and has a high temperature is the cooling air B that passes through the second intake duct 8b.
Is suppressed, and the cooling performance of the second magnetron 6b due to the cooling air B is suppressed from decreasing. The first partition 12a also has a similar partition. The partition 13 may have a double wall structure.

Further, the first cooling device 7a, the first magnetron 6a, and the first structure 12a are unitized in advance and shown in FIG.
As described above, the first unit 14a is configured, and the second cooling device 7
Similarly, the second magnetron 6b, the second magnet 12b, and the second structure 12b also constitute a second unit 14b. The first and second units 14a and 14b are mounted in the electrical equipment chamber 4 by mounting the first and second magnetrons 6a and 6b on the first and second waveguides 5a and 5b. ing. After this mounting, the first magnetron 6a of the first unit 14a is connected to the second exhaust duct 9 of the second unit 14b.
Connect to b.

Thus, the first and second units 14a, 1
Assembly into 4b facilitates assembly. Further, the first and second units 14a and 14b have the same standard and performance, and there is no problem even if the mounting positions of the first and second units 14a and 14b are interchanged, and in this respect as well, the assembly is easy.

The microwave oven having a plurality of magnetrons as described above has a high output and is for commercial use, and is generally used in convenience stores and the like. In this case, in a mode in which the microwave oven is placed on the cashier counter and operated by the store clerk, it is preferable that both the store clerk and the customer can confirm the heating state during operation and the remaining time. For this reason, the microwave oven further has a viewing window and a display unit (neither shown) on the back surface.

[0018]

According to the microwave oven of the present invention, an independent cooling path can be established for each magnetron in a structure having a plurality of microwave generators, for example, the first and second magnetrons, and the efficiency of each magnetron can be established. Good cooling can be ensured.

Further, since the exhaust duct for guiding the cooling air after cooling the first magnetron and the intake duct for guiding the cooling air to the second magnetron are integrated into a duct structure, the structure can be simplified.

Further, in this duct structure, since the partition portion for partitioning the exhaust duct and the intake duct has low thermal conductivity, the heat of the hot air passing through the exhaust duct is transmitted to the cooling air passing through the intake duct. It is possible to prevent the cooling performance of the second magnetron from being lowered.

Further, for each magnetron, by unitizing the magnetron, the cooling device, and the duct structure in which the intake duct and the exhaust duct are integrally formed,
Assembly can be simplified.

[Brief description of drawings]

FIG. 1 is a side view of a microwave oven according to an embodiment of the present invention when an exterior is removed.

FIG. 2 is a plan view of the same.

FIG. 3 is a perspective view of a main part.

[Explanation of symbols]

 6a 1st magnetron 6b 2nd magnetron 7a 1st cooling device 7b 2nd cooling device 8a 1st intake duct 8b 2nd intake duct 9a 1st exhaust duct 9b 2nd exhaust duct 12a 1st duct structure 12b 2nd duct structure 13 Partition part 14a 1st unit 14b 2nd unit

Claims (3)

[Claims] 1. A first and second microwave generator, first and second cooling devices for supplying cooling air to the first and second microwave generators, respectively, and the first microwave generator cooling. A microwave oven comprising an exhaust duct for guiding the subsequent cooling air and a duct structure integrally formed with an intake duct for guiding the cooling air from the second cooling device to the second microwave generator. 2. The microwave oven according to claim 1, wherein, in the duct structure, a partition portion that partitions the exhaust duct and the intake duct has low thermal conductivity. 3. A microwave generator, a cooling device for supplying cooling air to the microwave generator, and an intake duct and an exhaust duct for guiding the cooling air from the cooling device to the microwave generator are integrated. A first and a second unit in which the formed duct structure is unitized;
A microwave oven in which the microwave generator of the unit is connected to the exhaust duct of the second unit.