JPH0410386A - Microwave oven - Google Patents

Abstract

PURPOSE:To enable the easy matching of impedance and eliminate a vibration sound by drilling an excitation hole through the side panel of an oven frame body, providing a vertical waveguide along the side panel, adding a magnetron at the upper end of the waveguide and providing a high-voltage transformer at the lower end of the waveguide. CONSTITUTION:A waveguide 12 is provided approximately in a vertical direction in such a way as to cover an excitation hole 7 drilled through the side panel 4a of an oven frame body 4 at the side of a machine room 6. Also, a high- voltage transformer 10 is so provided as to oppose the side panel 4a. Furthermore, the height (h) of the lower end 12b of the waveguide 12 is made smaller than the height (H) of the upper end 12a thereof. As a result, discharge from an antenna 9a is eliminated. According to the aforesaid construction, impedance can be easily matched, and the sound of the vibration of the side panel 4a due to leakage flux occurring at the moment of power supply to the high-voltage transformer 10 can be prevented as a result of structural strengthening with the side panel 4a and waveguide 12.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a microwave oven for cooking food by high-frequency heating in an open space, for example, and particularly relates to a microwave oven for cooking food by high frequency heating in an open space. Concerning improvement of wave tubes.

(Prior Art) This type of microwave oven that has already been proposed is configured as shown in FIGS. 2 and 3.

That is, in FIGS. 2 and 3, an opening/closing door 2 and an operation panel 3 are provided on the front of a box-shaped case body 1, respectively, and an open frame is provided inside the case body 1. A body 4 is provided forming an opening 5 and a machine room 6. Further, an excitation lower is bored in the side plate 4a of the open frame body 4 on the side of the machine room 6, and the side plate 4a
A waveguide 8 is attached horizontally to cover the excitation lower. Further, a magnetron 9 is attached to the back end of the waveguide 8, and a high voltage transformer 1o is attached to the bottom plate 1a of the case body 1 located in the machine room 6. A vibration isolating rubber 11 is provided at a position lower than the magnetron 9, and is provided between the high voltage transformer 10 and the side plate 4a of the open frame 4.
is interposed so as to absorb vibration noise from the side plate 4a.

Therefore, in the above-mentioned microwave oven, by energizing the magnetron 9 during cooking, the magnetron 9 is heated.
Radio waves from the antenna 9a pass through the waveguide 8 and the excitation lower to heat and cook the food W in the open 5.

(Problem to be Solved by the Invention) However, in the above-mentioned microwave oven, since the waveguide 8 and the magnetron 9 are disposed above the high-voltage transformer 10, Due to insufficient dimensions, it is not only difficult to match impedances, but also there is a risk that discharge (spark phenomenon) may occur in the antenna 9a of the magnetron 9. Furthermore, the high voltage transformer 10 is installed directly opposite the side plate 4a of the open frame body 4, so that the vibration isolating rubber is used to absorb the vibration noise of the open frame body 4 due to the leakage magnetic flux that occurs at the moment when the high voltage transformer 10 is energized. 11 was forced to intervene.

The present invention has been made in view of the above-mentioned circumstances, and facilitates impedance matching.
To provide a microwave oven which prevents vibration noise of an open frame body due to leakage magnetic flux that occurs at the moment of energizing a high voltage transformer without interposing vibration isolating rubber.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides an open frame in which an open and machine room is formed in the case body, and an excitation port is bored in the side plate of the open frame on the machine room side. A substantially vertical waveguide is attached to the side plate so as to cover the excitation port, a magnetron is attached to the upper end of this waveguide, and a high voltage transformer is attached to the lower end of the waveguide to oppose it. It has been established.

(Function) The present invention includes a substantially vertical waveguide attached to the side plate so as to cover the excitation port, a magnetron attached to the upper end of the waveguide, and a magnetron attached to the lower end of the waveguide. By providing a high-voltage transformer to counteract this, impedance matching is facilitated, and the vibration noise of the open frame body due to leakage magnetic flux that occurs at the moment when electricity is applied to the high-voltage transformer is suppressed by connecting the side plate of the open frame body and the above-mentioned conductor. This is prevented by reinforcing the wave tube.

(Example) Hereinafter, the present invention will be described with reference to an illustrated embodiment.

Note that the present invention includes the same constituent members as those of the conventional example described above.
The same reference numerals will be used for explanation.

In FIGS. 1 and 2, reference numeral 1 denotes a box-shaped case body, and on the front of this case body 1,
An opening/closing door 2 and an operation panel 3 are provided, respectively.
Inside the case body 1, an open frame body 4 is open 5.
and a machine room 6. Further, an excitation lower is bored in the side plate 4a of the open frame body 4 on the side of the machine room 6, and a waveguide 12 is installed in the side plate 4a in a substantially vertical direction so as to cover the excitation lower. attached to. Further, a magnetron 9 equipped with an antenna 9a is attached to the upper end 12a of the waveguide 12, and a high voltage transformer 10 is attached to the bottom plate 1a of the case body 1 located in the machine room 6. It is provided so as to oppose the side plate 4a. Furthermore, the height h of the lower end portion 12b of the waveguide 12 is formed lower than the height H of the upper end portion 12a of the waveguide 12.

Therefore, in the present invention, the waveguide 12 is attached in a substantially vertical direction so as to cover the excitation lower, the high voltage transformer 10 is provided so as to oppose the side plate 4a, and the lower end of the waveguide 12 is provided. Since the height h of the waveguide 12b is formed lower than the height H of the upper end 12a of the waveguide 12, discharge (spark) of the antenna 9a can be eliminated and impedance matching can be easily achieved. The above high voltage transformer 10
Open frame 4 due to leakage magnetic flux that occurs the moment electricity is applied to
Vibration noise caused by the side plate 4a can be prevented by reinforcement by the side plate 4a and the waveguide 12.

〔Effect of the invention〕

As described above, according to the present invention, an open frame with an open and a machine room formed inside the case body is provided, an excitation port is bored in the side plate of the open frame on the side of the machine room, and an excitation port is bored in the side plate of the open frame on the machine room side. A substantially vertical waveguide is attached to cover the excitation port, and a magnetron is attached to the upper end of this waveguide.
A high-voltage transformer is provided at the lower end of the waveguide to counteract this, which eliminates the antenna discharge phenomenon, facilitates impedance matching, and leaks magnetic flux that occurs the moment the high-voltage transformer is energized. The vibration noise of the open frame body can be prevented by strengthening the side plate of the open frame body and the waveguide, and furthermore, since no anti-vibration rubber is used, assembly and adjustment are easy, and labor can be saved through mass production. It has excellent effects such as being able to achieve the following.

FIG. 2 is a plan view of the microwave oven that has already been proposed, and FIG. 3 is a cross-sectional view showing the main parts of the microwave oven that has already been proposed.

1...Case body, 4...Open frame body, 5...-
Open, 6... Machine room, 7... Excitation port, 9...
Magnetron, 10... High voltage transformer, 12... Waveguide.

Claims (1)

[Claims] An open frame body provided inside the case body and forming a machine room; an excitation port drilled in a side plate of the open frame body on the machine room side; and an excitation port formed in the side plate to cover the excitation port. A waveguide attached in the vertical direction, a magnetron attached to the upper end of the waveguide, and a high voltage transformer provided at the lower end of the waveguide so as to oppose it. A microwave oven featuring