KR20050088819A - High voltage transformer provided with air-guide groove and microwave oven range with the same - Google Patents

Abstract

The present invention relates to a high-pressure transformer having a heat dissipation effect and a microwave oven having the same by reducing the flow resistance of the air around the high-voltage transformer while widening the contact area between the core and the air of the high-voltage transformer.

The high pressure transformer according to the present invention includes a core in which a plurality of iron pieces are stacked; It includes a coil wound around the core, characterized in that the core is formed with an air guide groove for guiding the air passing through.

Description

HIGH VOLTAGE TRANSFORMER PROVIDED WITH AIR-GUIDE GROOVE AND MICROWAVE OVEN RANGE WITH THE SAME}

The present invention relates to a high pressure transformer having an air guide groove and a microwave oven having the same, and more particularly, to a high pressure transformer having a structure for easy cooling.

In general, as shown in FIG. 1, the microwave oven includes a cooking chamber 30 that accommodates food and an electrical equipment chamber 40 in which various electrical equipments are installed. The cooking chamber 30 has an open front face, and a door 10 for opening and closing the opening part is provided at the cooking chamber 30 front surface. The front of the electric compartment 40 is provided with a control panel 20 for operating a variety of electrical appliances, inside the electric compartment 40, a magnetron 41 for radiating microwaves to the cooking chamber 30, and the magnetron 41 The high voltage transformer 50, the high voltage capacitor 42, and the high voltage diode 43 constituting the driving circuit for driving the high voltage device are provided. In addition, a cooling fan 44 for cooling various electric components including the magnetron 41 is provided at the rear side of the cooking chamber 30.

The high voltage transformer 50 is a device for boosting a commercial AC voltage to a high voltage of 2000 volts or more. The high voltage transformer 50 includes a core in which a plurality of iron pieces are stacked and a coil wound around the core. Due to the electrical resistance in the coil during the operation of the high voltage transformer 50, the high voltage transformer 50 generates heat at a high temperature. This high temperature heat causes malfunction of the device and impairs safety. Cooling 50) below a certain temperature is a very important problem.

To this end, the Republic of Korea Utility Model Registration No. 211344 has provided a heat radiation fin around the core to promote heat dissipation of the high-voltage transformer (50). However, in order to provide the heat dissipation fins, an additional material and an assembly process are added to improve productivity, as well as an increase in the flow resistance of the air due to the addition of the heat dissipation fins.

The present invention is to solve this problem, an object of the present invention is to expand the contact area between the core and the air of the high-voltage transformer while reducing the flow resistance of the air around the high-voltage transformer high pressure transformer having good heat dissipation effect and the electronic To provide a range.

Still another object of the present invention is to provide a high-voltage transformer and a microwave oven having the same, which are highly productive because the manufacturing cost and time are reduced, unlike a conventional high-voltage transformer, which does not include a separate heat sink.

In order to achieve this object, the high-voltage transformer according to the present invention includes a core in which a plurality of iron pieces are stacked; It includes a coil wound around the core, characterized in that the core is formed with an air guide groove for guiding the air passing through.

In addition, the air guide groove is characterized in that the plurality is formed long along the flow direction of air on the outer surface of the core.

In addition, the cross section of the air guide groove is characterized in that any one of the square, inverted triangle, semi-circular.

And the microwave oven according to the present invention for achieving this object is a cooking chamber for cooking food; An electric equipment chamber including various electric components including a magnetron for generating microwaves to be radiated to the cooking chamber; A high voltage transformer installed in the electrical equipment room and having a core in which a plurality of iron pieces are stacked, and a coil wound around the core;

The core is characterized in that the air guide groove is formed for guiding the air passing through.

The microwave oven may further include a cooling fan for flowing air into the electric compartment.

In addition, the air guide groove is characterized in that the plurality is formed long along the flow direction of air on the outer surface of the core.

In addition, the cross section of the air guide groove is any one of a rectangular, inverted triangle, semi-circular microwave oven.

Hereinafter, a high pressure transformer having an air guide groove and a microwave oven having the same according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 2, the microwave oven according to the present invention includes a case 100 forming an external appearance, and a cooking chamber 130 having an open front to accommodate food in the case 100, and various electric components. The electrical equipment room 140 is installed.

The front of the case 100, the door 110 is hinged to one side to open and close the cooking chamber 130, and is located in front of the battle room 140, the control for operating the various devices inside the battle chamber 140 The panel 120 is installed.

The electric chamber 140 includes a magnetron 141 for generating microwaves to radiate into the cooking chamber 130, a high voltage transformer 150, a high voltage capacitor 142, and a high pressure which constitute a driving circuit for driving the magnetron 141. Diode 143 and the like are provided. In addition, a cooling fan 144 is provided at the rear of the electrical equipment room 140 to suck various air to cool various electrical components inside the electrical equipment room 140.

The high voltage transformer 150 (HVT: High Voltage Transformer) receives a commercial AC power supply (AC 110V, or 220V) and outputs a predetermined high voltage of about 2000V. The output voltage is a high voltage capacitor 142 and a high voltage diode ( Back pressure by 143) to maintain 4000V. This voltage is supplied to the magnetron 141, and the magnetron 141 generates microwaves of 2450 MHz.

Detailed structure of the high-voltage transformer 150 is, as shown in Figure 3a, the core 151 made by laminating a steel sheet of a material such as silicon steel sheet, permalloy or ferrite, and the first and second winding wound on the core 151 Coils 152 and 153 are provided. The primary coil 152 is provided with an input terminal 154 for receiving commercial power, and the secondary coil 153 is provided with an output terminal 155 for outputting high voltage power. The output voltage at the output terminal 155 is determined by the turns ratio of the primary and secondary coils 152 and 153. The cores 151 and the coils 152 and 153 are fixed to the bottom of the electric chamber 140 by the mounting plate 156. Air guide grooves 151a elongated in the flow direction of the air (indicated by the arrow) are formed on the upper surface and both sides of the core 151, so that the flow of air generated by the cooling fan 144 is the air guide groove. It flows along 151a. The air guide groove 151a is formed by using a mold having a shape corresponding to the air guide groove 151a in the process of punching out each iron piece constituting the core 151.

Hereinafter will be described the operation and operation of the high-voltage transformer 150 and the microwave oven having the same according to the embodiment.

When food is placed in the cooking chamber 130 and the microwave oven is operated through the control panel 120, commercial power is applied to the high voltage transformer 150, and the high voltage transformer 150 boosts the commercial power to approximately 2000V. . The voltage is again backed up to a high voltage of about 4000V by the high voltage capacitor 142 and the high voltage diode 143 and transferred to the magnetron 141. The magnetron 141 receives this high voltage power and generates 2450 MHz microwaves to radiate them into the cooking chamber 130. In the cooking chamber 130, the food is cooked by the microwaves.

On the other hand, when the microwave oven is operating, the cooling fan 144 is operated to cool the heat generated by the magnetron 141 or the high-pressure transformer 150 to circulate the outside air into the electric chamber 140 is Occurs.

Due to the flow of air, air flows around the high pressure transformer 150, and the air passing around the high pressure transformer 150 flows along the air guide groove 151 a formed in the core 151. Since the core 151 has a large contact area with air due to the air guide groove 151a, heat dissipation of the high voltage transformer 150 is promoted. The air guide groove 151a reduces the area of the core 151 itself, which acts as a resistance to the air flow cross section, unlike the heat radiation fins used in the conventional high pressure transformer 150. Increases the amount of air flowing through the heat dissipation is active.

On the other hand, since the air guide groove 151a can be manufactured by integrally punching when the iron pieces constituting the core 151 are integrally manufactured, the high-pressure transformer 150 having good heat dissipation effect can be manufactured without the addition of additional materials or processes. can do.

In the above only the co-op transformer 150 and the microwave oven having the same according to an embodiment of the present invention have been described. The cross-sectional shape of the air guide groove 151a is not only a channel-shaped quadrangle, but also various modifications such as a notch-shaped inverted triangle and a semi-circle as shown in FIGS. 3B and 3C, which are also within the scope of the present invention.

The degree of heat dissipation may be varied by varying the number of air guide grooves 151a, 151b, and 151c according to the heat generation degree of the co-pressure transformer 150.

As described above in detail, the high-pressure transformer according to the present invention has an air guide groove formed in the core, so that the contact area between the core and the air is wide and the flow resistance is reduced, thereby providing excellent heat dissipation effect.

In addition, unlike the conventional transformer, because it does not have a separate heat dissipation fin, there is an advantage in that the productivity and time are reduced and productivity is high.

1 is a perspective view showing a conventional microwave oven.

Figure 2 is a perspective view of a microwave oven according to a preferred embodiment of the present invention.

Figure 3a is a perspective view showing a high voltage transformer in accordance with a preferred embodiment of the present invention.

Figure 3b, 3c is a perspective view showing a high-voltage transformer according to another embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

100: case 110: door

120: control panel 130: cooking chamber

140: battlefield 141: magnetron

142: high pressure capacitor 143: high voltage diode

144: cooling fan 150: high pressure transformer

151: core 151a, 151b, 151c: air guide groove

152,153: coil

Claims (7)

A core in which a plurality of iron pieces are stacked; A coil wound around the core; High pressure transformer, characterized in that the core is formed with an air guide groove for guiding the air passing through. The high pressure transformer according to claim 1, wherein a plurality of air guide grooves are formed along the flow direction of air on the outer surface of the core. 3. The high pressure transformer according to claim 2, wherein the cross section of the air guide groove is any one of a rectangle, an inverted triangle, and a semicircle. A cooking chamber for cooking food; An electric equipment chamber including various electric components including a magnetron for generating microwaves to be radiated to the cooking chamber; A high voltage transformer installed in the electrical equipment room and having a core in which a plurality of iron pieces are stacked, and a coil wound around the core; Microwave oven characterized in that the core is formed with an air guide groove for guiding the air passing through. The method of claim 4, wherein The microwave oven further comprises a cooling fan for flowing air in the electric compartment. The method of claim 5, The air guide groove is a plurality of microwave oven, characterized in that formed long along the flow direction of air on the outer surface of the core. The method of claim 6, The cross section of the air guide groove is any one of a rectangular, inverted triangle, semi-circular microwave oven.