JPH05322186A - Microwave oven - Google Patents

Abstract

PURPOSE:To eliminate cooling imbalance of individual magnetrons and high voltage transformers in a microwave oven which has a plurality of magnetrons and a plurality of high voltage transformers corresponding to the magnetrons. CONSTITUTION:A cooking air introduction path which is formed with the wall of a heating chamber 2 and the bottom wall of an armor box body 1 is closed partially with a partition plate 7 having a draft hole 8 at positions facing first and second high voltage transformers 5a and 5b to form first and second air ports. Distribution ratio of suction cooling air from an opening 6 as flowing into an electric equipment chamber 3 is adjusted depending on the size of the draft hole 8 and the first and second air ports.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure for a microwave oven having a plurality of magnetrons and a plurality of high voltage transformers.

[0002]

2. Description of the Related Art Two magnetrons and two high-voltage transformers for driving each magnetron are provided, and each magnetron is cooled by a discharge air from a cooling fan and two high-voltage transformers are supplied by an intake air to the cooling fan. A cooling microwave oven is disclosed in Japanese Utility Model Laid-Open No. 60-152291.

In such a structure, an imbalance is likely to occur in the amount of cooling air that cools the two high-voltage transformers, so that a difference occurs in the intake air temperature of each cooling fan that cools the magnetron. Therefore, each of the two high-voltage transformers and the two magnetrons cannot be cooled uniformly, and although the one high-voltage transformer and the magnetron have a sufficient temperature margin, the other high-voltage transformer and the magnetron cannot be cooled. There was a temperature imbalance that there was no room at all, and there were inconveniences such as high voltage transformers and magnetrons could not be used efficiently.

[0004]

In a microwave oven having a plurality of magnetrons and a plurality of high-voltage transformers corresponding to the magnetrons, cooling imbalances of the magnetron and the high-voltage transformer are eliminated.

[0005]

According to the present invention, there is provided an outer casing, a heating chamber provided in the casing, an electrical equipment chamber adjacent to the heating chamber for accommodating electric parts, and the heating equipment provided in the electrical equipment chamber. First and second magnetrons for supplying microwaves to the room, first and second high-voltage transformers provided on the bottom wall of the electrical equipment room for driving the first and second magnetrons, respectively, and a housing facing the heating room wall An opening provided in the bottom wall, first and second cooling fans that are arranged in the electrical equipment chamber and inhale air from the opening to blow cooling air to the first and second magnetrons, and from the opening to the electrical equipment chamber A partition plate having ventilation holes for adjusting the amount of cooling air to the first and second high-voltage transformers is provided in the cooling air introduction passage.

[0006]

The amount of cooling air flowing around each high-voltage transformer can be adjusted by the ventilation holes provided in the partition plate and the installation position of the partition plate.

[0007]

1 to 3 show a microwave oven according to an embodiment of the present invention, in which an outer casing 1 is provided with a heating chamber 2 and an electric equipment chamber 3 for accommodating electric parts. .. 4a, 4
b is provided in the electrical equipment chamber 3, and the first and second magnetrons 5a and 5b for supplying microwaves into the heating chamber 2 are provided on the bottom wall of the electrical equipment chamber 3, and the first and second magnetrons are provided. First and second high voltage transformers driving 4a and 4b respectively, 6 is an opening provided in the bottom wall of the exterior housing 1 facing the wall of the heating chamber 2, and 7 is the electric equipment chamber 3 for supplying the cooling air sucked from the opening 6. A partition plate for shunting the electric components disposed inside, the partition plate 7 has ventilation holes 8 at positions facing the first and second high-voltage transformers 5a and 5b, and is heated by elasticity of the partition plate itself. It is attached to the bottom wall of the electrical equipment chamber 3 by spot welding or the like so as to suppress the chamber wall, and partially closes the cooling air introduction passage formed by the heating chamber 2 wall and the exterior housing 1 bottom wall, thereby heating the heating chamber. Ventilation hole 9 located on the front wall side of the chamber and the second ventilation hole 1 located on the rear wall side of the heating chamber To form a.

Reference numerals 11a and 11b are first and second cooling fans for blowing cooling air to the first and second magnetrons 4a and 4b, and 12 is air feeding for guiding the discharge air of the first cooling fan 11a to the first magnetron 4a. The duct, 13 guides the air after cooling the first magnetron 4a into the heating chamber 2, and
An air supply / exhaust duct that guides the air discharged from the cooling fan 11b to the second magnetron 4b, and an exhaust duct 14 that guides the air after cooling the second magnetron 4b to the inside of the heating chamber 2 and the outside of the exterior housing 1.

Numeral 15 is a stirrer blade provided on the upper part of the heating chamber 2 for stirring microwave radio waves and driven by the wind after cooling the first and second magnetrons 4a, 4b introduced into the heating chamber 2. To be done. Reference numeral 16 is a radio wave reflection plate for improving heating unevenness during microwave heating, and the stirrer blade is provided so that the wind driving the stirrer blade effectively acts on the stirrer blade 15.
It is arranged around the blade 15. Reference numeral 17 is a stirrer protection bar for protecting the stirrer blades 15 and the radio wave reflection plate 16.

Then, the first and second cooling fans 11 mentioned above.
The cooling air sucked from the opening 6 by the operation of a and 11b passes through the cooling air introduction passage formed by the wall of the heating chamber 2 and the outer casing 1, and a part of the cooling air is formed on the partition plate 7. The cooling air blown from one side of each high-voltage transformer 5a, 5b through the ventilation hole 8 and the first ventilation port 9 and the second ventilation port 10 into the electrical equipment chamber 3 to generate the first and second high-voltage transformers 5a. Cool the other side of 5b.

Thereafter, the cooling air that has cooled the high-voltage transformer is sucked by the first and second cooling fans 11a and 11b, and the air discharged from the first cooling fan 11a is sent to the air supply duct 12.
The discharge air of the second cooling fan 11b passes through the first magnetron 4a and the air supply / exhaust duct 13 into the heating chamber 2, while the discharge air of the second cooling fan 11b passes through the air supply / exhaust duct 13, the second magnetron 4b, and the exhaust duct 14, and the inside of the heating chamber 2 and the exterior. The air is blown outside the housing 1. The air blown into the heating chamber is guided by the reflection plate 16 to drive the stirrer blades 15.

Therefore, the first and second high voltage transformers 5a,
The sizes of the ventilation holes 8 and the first and second ventilation holes 9 and 10 of the partition plate 7 are adjusted so that the cooling level of 5b becomes substantially the same, and the cooling air is introduced into the electrical equipment chamber 3 from the introduction path. By adjusting the split ratio of the cooling air, the intake air temperatures of the first and second cooling fans can be made substantially the same, and the first and second magnetrons 4a and 4b can be obtained.
The cooling levels can be made substantially the same. Moreover, since the elasticity of the partition plate 7 is used to elastically attach the heating chamber wall at the upper end of the partition plate 7, vibration of the heating chamber 2 wall and the partition plate 7 due to the leakage magnetic flux of the high-voltage transformers 5a and 5b is prevented. Suppressed.

[0013]

EFFECTS OF THE INVENTION A partition plate having ventilation holes at positions facing the first and second high-voltage transformers closes a cooling air introduction passage formed by a heating chamber wall and a bottom wall of an outer casing, thereby heating the heating chamber. A first ventilation hole located on the front wall side of the heating chamber and a second ventilation hole located on the rear wall side of the heating chamber, so that the cooling levels of the first and second high-voltage transformers are substantially the same. Ventilation holes in the board,
Since the cooling air can be diverted and adjusted by the first and second vents, the cooling levels of the first and second magnetrons can be made substantially the same. Therefore, each of the two high-voltage transformers and the two magnetrons can be cooled uniformly, so that the temperature imbalance is resolved and the high-voltage transformer and the magnetron can be used efficiently.

[Brief description of drawings]

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

FIG. 2 is a side view of an electric equipment room of the microwave oven according to the embodiment of the present invention.

3 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exterior case 2 Heating chamber 3 Electric equipment chamber 4a 1st magnetron 4b 2nd magnetron 5a 1st high voltage transformer 5b 2nd high voltage transformer 6 opening 7 partition plate 8 ventilation hole 11a 1st cooling fan 11b 2nd cooling fan

Claims (1)

[Claims] 1. An exterior casing, a heating chamber provided in the casing, an electrical equipment chamber adjacent to the heating chamber for accommodating electric parts, and a microwave disposed in the electrical equipment chamber to supply microwaves to the heating chamber. 1st and 2nd magnetrons, 1st provided in the bottom wall of the said electrical equipment chamber, and respectively driving said 1st and 2nd magnetrons
And a second high-voltage transformer, an opening provided in a bottom wall of the housing facing the heating chamber wall, and a first air-discharging device provided in the electrical equipment chamber for inhaling cooling air to the first and second magnetrons. And an electronic component comprising a second cooling fan, and a partition plate having a ventilation hole for adjusting the amount of cooling air to the first and second high-voltage transformers is provided in the cooling air introduction path from the opening into the electrical equipment chamber. range.