JPH0523491U - High frequency heating device - Google Patents

Abstract

(57) [Abstract] [Purpose] In a microwave oven that drives a magnetron at high frequency using an inverter, the leakage magnetic flux from the high-frequency high-voltage transformer and the harmonic noise from the inverter are shielded.
Efficiently cool each component of the inverter. A magnetron 2 for supplying a high frequency to a heating chamber for containing food, an inverter 5 for driving the magnetron 2 at a high frequency, a cooling fan 6 for supplying cooling air to the magnetron 2 and the inverter 5, and an inverter 5
And a metallic storage portion 9 having wire meshes 8, 8 for storing the cooling air.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a high-frequency heating device such as a microwave oven which drives a high-frequency supplying means at a high frequency using an inverter.

[0002]

[Prior Art]

 Recently, a microwave oven (see Japanese Patent Application Laid-Open No. 1-248487, etc.) has been commercialized in which an inverter is used to drive a high frequency supplying means, that is, a magnetron. As an example of mounting the main parts in such a microwave oven, a magnetron is arranged in the upper part of the electrical equipment room, an inverter is arranged in the lower part, and one cooling fan is arranged behind these magnetron and inverter. The magnetron and the inverter are cooled by this cooling fan.

[0003]

[Problems to be solved by the device]

 However, such a microwave oven has the following two problems.

Generally, a high-frequency high-voltage transformer used in an inverter has an open structure for cooling windings and a void is provided in a ferrite core, so that the leakage magnetic flux is large and an iron plate or the like for the exterior of a microwave oven is used. To heat.

Since the inverter (voltage resonance type) has a large distortion of the current waveform, it radiates harmonic noise and interferes with a radio or the like.

Since many parts of the inverter require cooling and are widely dispersed on the printed circuit board, it is difficult to cool these parts, and the structure of the air passage becomes complicated.

The present invention is intended to provide a high-frequency heating device that can shield leakage flux from a high-frequency high-voltage transformer and harmonic noise from an inverter and can efficiently cool each component of the inverter.

[0008]

[Means for Solving the Problems]

 The high-frequency heating device of the present invention comprises a high-frequency supplying means for supplying a high-frequency into a heating chamber containing food, an inverter for driving the high-frequency supplying means at a high frequency, and a cooling air supply for the high-frequency supplying means and the inverter. Cooling fan, and a metal storage unit that stores the above-mentioned inverter and has a mesh-shaped portion for passing cooling air.

[0009]

[Action]

 Since the inverter is housed in the metal housing, leakage magnetic flux from the high-frequency high-voltage transformer and harmonic noise from the inverter are shielded. Furthermore, the cooling air that cools the inverter passes through the metal housing and is separated from the cooling air of the high-frequency supply means, so that each of the inverter parts is efficiently cooled. In the metallic storage part, since the place where cooling air passes is a mesh, it substantially shields the above-mentioned leakage magnetic flux and harmonic noise.

[0010]

【Example】

 FIG. 1 shows a microwave oven according to an embodiment of the present invention. An electric equipment room 1 is formed on the right side of a heating room (not shown) for storing food. In the electrical equipment room 1, a magnetron 2 for supplying a high frequency into the heating chamber, a high frequency high voltage transformer 4 mounted on a printed circuit board 3 and the like, an inverter 5 for driving the magnetron 2 at a high frequency, the magnetron 2 and the inverter. A cooling fan 6 for supplying cooling air to 5 is provided. Further, a duct 7 for guiding the cooling air from the cooling fan 6 to the magnetron 2 and a high conductivity metal material such as aluminum for accommodating the inverter 5 and an inlet and an outlet for allowing the cooling air from the cooling fan 6 to pass therethrough. Is a mesh, that is, a wire mesh 8, and a storage portion 9 is arranged. The outside of the storage unit 9 is covered with a heat insulating material (not shown) to prevent heat from the heating chamber from being transferred to the storage unit.

Since the inverter 5 is housed in the housing portion 9, the leakage magnetic flux from the high frequency high voltage transformer 4 and the harmonic noise from the inverter 5 are shielded. Furthermore, the cooling air that cools the inverter 5 passes through the storage portion 9 and is separated from the cooling air of the magnetron 2, and efficiently cools each component of the inverter 5. In the storage section 9, since the places through which the cooling air passes are the metal nets 8 and 8, the above-mentioned leakage magnetic flux and harmonic noise are effectively shielded.

[0012]

[Effect of the device]

 According to the present invention, in the high-frequency heating device that drives the high-frequency supplying means by using the inverter, the leakage magnetic flux from the high-frequency high-voltage transformer and the harmonic noise from the inverter can be shielded, and each component of the inverter can be efficiently cooled. .

[Brief description of drawings]

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

[Explanation of symbols]

 2 Magnetron 5 Inverter 6 Cooling fan 8 Wire net 9 Storage

Claims (1)

[Scope of utility model registration request] 1. A high frequency supplying means for supplying a high frequency to a heating chamber containing food, an inverter for driving the high frequency supplying means with a high frequency, a cooling fan for supplying cooling air to the high frequency supplying means and the inverter, and the inverter. And a high-frequency heating device comprising a metallic storage part having a mesh-shaped portion for storing cooling air.