KR970005101B1 - Microwave sealing apparatus for a microwave oven - Google Patents

Abstract

An electric room of a microwave range has a metal box. A high voltage transformer(15), a high voltage capacitor(16), a high voltage diode(17) and a cooling fan(18), etc is placed within the box, and a magnetron is placed above the box(20). With this structure, if high frequency irradiates inside the cooking room through a wave guide(12) connecting from the high voltage transformer(15) to the magnetron(11), unnecessary high frequency flows backward and comes in through the magnetron(11). The electronic wave coming through the magnetron(11) flow into the metal box(20), and from the high voltage transformer and some other equipment unnecessarily radiating electronic wave is produced. However, these electronic wave is unable to escape out of the box(20) and they are offset each other, so the neighboring equipments remain in stable state.

Description

Microwave electromagnetic shielding device

1 is a block diagram showing a conventional embodiment.

2 is a block diagram showing an electromagnetic shielding device of the present invention.

* Explanation of symbols for main parts of the drawings

11: magnetron 11a: high frequency choke

15: high voltage transformer 16: high voltage capacitor

17 high voltage diode 18 cooling fan

20: enclosure

The present invention relates to an invention capable of simplifying the electronic product arrangement structure of the microwave oven while fundamentally shielding various kinds of electromagnetic waves which are unnecessarily flowed back in the microwave oven.

In general, a magnetron is installed at one side waveguide of the cooking chamber to generate high frequency. The primary and secondary induction coils of the high voltage transformer mounted on the bottom plate of the electrical equipment room stably receive the high voltage generated by the mutual induction action. When applied to the magnetron, the magnetron generates a high frequency.

In the related art, a magnetron stably applied with a high voltage in a high voltage transformer oscillates a high frequency, in which undesired electromagnetic waves flow back to adversely affect peripheral devices due to electromagnetic interference.

A filter box is installed below the magnetron, and a high frequency choke, choke coil and a through capacitor are installed therein so that one end of the high frequency choke coil is connected to the power supply line of the filament for the magnetron and the other end is connected to the lead wire of the through capacitor. Therefore, it is configured to absorb or block unnecessary electromagnetic waves flowing back from the magnetron.

However, the high frequency chokes, choke coils and through-type capacitors built in the filter box cannot completely absorb or block unwanted radiated electromagnetic waves, so some electromagnetic waves are reversed and adversely affect the power supply and peripherals. In the high voltage transformer that supplies the current stably and some equipments, unnecessary electromagnetic waves are generated, and these electromagnetic waves have a bad effect on the peripherals and the power supply.

Therefore, noise filter equipped with choke coil in addition to magnetron (1), capacitor (4), high voltage transformer (5), high voltage capacitor (6), high voltage diode (7), cooling fan (8), etc. FILTER) is installed in the electrical equipment room by the mutual induction action of the first secondary induction coil of the high voltage transformer (5) through the high pressure diode (7) and the high pressure capacitor (6) in the electric heating of the microwave oven. As the generated high voltage is stably applied to the magnetron 1, the magnetron 1 generates a high frequency wave and irradiates the microwave cooking chamber through the waveguide 2, from the magnetron 1 to the waveguide 2. When oscillating a high frequency, an unwanted radiated electromagnetic wave flows back to absorb the electromagnetic wave primarily reversed by the high frequency choke, the choke coil and the through capacitor 4 in the filter box 3.

The filter box 3 is formed on the magnetron 1 and the high frequency choke, the choke coil and the through-type capacitor 4 are installed in the filter box 3 to absorb the electromagnetic radiation which is not radiated, and the electromagnetic wave is not absorbed but is flowed back. And a high-pressure transformer (5) for stably supplying a high-voltage current to the magnetron (1), and a noise filter (9) has been separately installed in order to block the second absorption by combining the electromagnetic radiation that is unnecessary.

However, the noise filter 9 alone cannot completely absorb unwanted electromagnetic waves, and the noise filter 9 is composed of various components such as choke coils, capacitors, and fuses. There was a long time for Pedan.

Therefore, an object of the present invention is to remove the choke coil and through-capacitor in the filter box and the filter box that primarily blocks the electromagnetic waves, and to prevent the electromagnetic wave from flowing backward without forming a noid filter separately. It is to provide a microwave high-frequency shielding device that can cancel the electromagnetic wave flowing back by attaching.

Hereinafter, described in detail by the accompanying drawings a preferred embodiment that can achieve the above object is as follows.

That is, according to the present invention, a metal enclosure 20 is provided in an electric chamber of a microwave oven, and the high voltage transformer 15, the high voltage capacitor 16, the high voltage diode 17, and the cooling fan 18 are provided inside the enclosure 20. The magnetron 11 is attached to the upper part of the housing 20, but the high frequency choke 11a of the magnetron 11 is positioned inside the housing 20. In the drawing, reference numeral 12 denotes a waveguide, ( 21 is an intake hole for sucking air when the cooling fan is rotated, and 22 is an exhaust hole for discharging air.

The present invention thus formed is connected to the high voltage generated by the mutual induction action of the primary and secondary induction coils directly from the high voltage transformer 15 to the magnetron 11 to irradiate the high frequency inside the cooking chamber through the waveguide 12. In this case, when the high frequency is oscillated through the waveguide 12 in the magnetron 11, undesired high frequency is reversed to enter through the magnetron 11.

Then, the electromagnetic wave introduced through the magnetron 11 flows into the metal enclosure 20 installed under the magnetron 11 and also supplies a high voltage current to the magnetron 11 in a stable manner. The electromagnetic radiation is generated and these electromagnetic waves do not escape to the outside of the housing 20, but are printed together in the inside of the housing 20 as it is to stabilize the peripherals outside the housing 20.

The present invention forms the metal housing 20 in the lower portion of the magnetron 11 so that the conducting wire of the high frequency choke 11a directly without passing through the through-type capacitor and the choke coil in the high-voltage transformer 15 installed in the housing 20. By introducing a high voltage into the magnetron 11 through a high voltage through the high-frequency transformer (15) and electromagnetic waves from the reverse flow when the high frequency is irradiated from the magnetron (11) in the housing 20 It is to be offset.

In this way, a metal enclosure 20 is formed, and all electrical components such as a high frequency choke 11a, a high voltage transformer 15, a high pressure capacitor 16, and a cooling fan 18 are united in the unit 20. It can be produced in a way that can maximize the productivity.

In addition, the present invention is to install the cooling fan 18 in the housing 20, in order to facilitate the flow of air to form a suction hole 21 in the cooling fan 18 is installed and the exhaust hole (the opposite side) 22) to facilitate the flow of air, the diameter of the suction hole 21 and the exhaust hole 22 is to be configured to 5mm or less so that electromagnetic waves can not pass.

As described above, the present invention installs a metal enclosure at the bottom of the magnetron to counteract the incoming electromagnetic waves in the enclosure, and is installed on one side of the choke coil, through-type capacitor and the electric compartment inside the filter bath and the filter box. It is a very useful invention that can reduce the cost of materials by eliminating the noise filter and can manufacture all the electronics such as high voltage transformer, high pressure condenser and cooling fan in unit units, thereby maximizing productivity.

Claims (3)

When installing the magnetron 11, the high-voltage transformer 15, the high-pressure capacitor 16, the high-pressure diode 17, the cooling fan 18, etc. in the electric chamber of the microwave oven, a metal enclosure (11) in the lower portion of the magnetron (11). 20) and the high pressure transformer 15, the high pressure capacitor 16, the high pressure diode 17, the cooling fan 18, etc. are installed inside the enclosure 20, and the magnetron 11 is attached to the upper portion of the enclosure 20. Microwave electromagnetic shielding device characterized in that the installation. The microwave electromagnetic shielding apparatus according to claim 1, wherein the housing (20) is formed with suction holes (21) and exhaust holes (22) to smooth air flow. 3. The microwave shielding device according to claim 2, wherein a diameter of the suction hole (21) and the exhaust hole (22) is 5 mm or less.