KR20150028390A

KR20150028390A - microwave oven

Info

Publication number: KR20150028390A
Application number: KR20130106430A
Authority: KR
Inventors: 김현주; 김진성; 최건우; 김광근; 서응렬; 이세훈
Original assignee: 삼성전자주식회사
Priority date: 2013-09-05
Filing date: 2013-09-05
Publication date: 2015-03-16

Abstract

Disclosed is a microwave oven with an improved structure to effectively cool down a device which generates heat during operation. The microwave oven including a cooking space and an electric field space includes: a magnetron which is installed inside the electric field space and radiates microwaves inside the cooking space to cook food; a high voltage trans which applies a voltage to the magnetron; and an air blast fan casing which accommodates an air blast inside and includes a plurality of outlets including a first outlet for discharging air flowing into the electric field by rotation of the air blast towards the magnetron and a second outlet towards the high voltage trans.

Description

Microwave oven

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a microwave oven, and more particularly, to a microwave oven having an improved structure for effectively cooling a device for generating heat during operation.

A microwave oven is a cooking device that heats food using the property of electromagnetic waves called microwave. The microwave oven generates heat from the inside of the food by the dielectric heating method to warm the food.

When an electromagnetic wave having a high frequency collides with a food, the water molecules inside the food are rotated, and the molecular arrangement of the food is disturbed. Microwave ovens heat food using heat generated by water molecule rotation.

Specifically, when food is put into the cooking chamber and the magnetron, which is mounted in the electric room, oscillates the high frequency and fires into the cooking chamber, the high frequency is absorbed by the food, and the collision between the food molecules is caused by the high frequency The food is heated and cooked.

During the operation of the microwave oven, high temperature heat is generated in the magnetron generating the high frequency and in the high voltage transformer converting the voltage, and the heat must be cooled to prevent breakage of the microwave components and smooth operation.

Generally, a high-pressure transformer installed in the electric room and a blower fan are installed on the sides of the magnetron. When heat is generated in the magnetron and the high-pressure transformer during operation of the microwave oven, the air introduced into the electric room by the rotation of the blower fan flows through the high-pressure transformer to cool the heat generated by the magnetron and the high-voltage transformer.

In such a cooling structure of the microwave oven, the flow of the air flowing through the blowing fan flows around the edge of the blowing fan, so that the air can not flow sufficiently to the magnetron and the high-pressure transformer, and the cooling ability may be lowered.

Further, since the air introduced into the electric room by the rotation of the blowing fan flows through the porous air passage formed on the wall of the cooking chamber, the passage resistance of the microwave oven can be made high. In the microwave oven having a high flow path resistance, the air flow rate is reduced. Accordingly, in order to sufficiently cool the high-pressure transformer and the magnetron, the number of revolutions per minute (rpm) of the blowing fan must be increased.

A related art document is Korean Patent Laid-Open Publication No. 10-1997-0066297 (fan structure of a microwave oven).

One aspect of the present invention provides a microwave oven having an improved structure for effectively cooling heat generated in a magnetron and a high-pressure transformer.

Another aspect of the present invention provides a microwave oven having an improved structure to reduce noise generated by increasing the number of revolutions of the blowing fan.

A microwave oven according to an embodiment of the present invention includes a magnetron having a cooking cavity and an electric chamber and radiating a microwave into the cooking chamber to be installed in the electric chamber so as to prepare food, A high voltage transformer for applying a voltage and a blowing fan inside and a first discharge port through which air introduced into the electric room by rotation of the blowing fan is discharged toward the magnetron, And a plurality of discharge ports including a second discharge port which is discharged toward the discharge fan casing.

Wherein the blowing fan casing is provided with a frame in which a suction port is formed so that the air introduced into the electric room is transmitted to the blowing fan and the air introduced into the suction port is blown by the magnetron and / And a plurality of guides formed along the periphery of the blowing fan so as to flow toward the high-pressure transformer.

The plurality of guides may include a first guide that forms a part of the first discharge port so that air introduced into the blowing fan casing flows through the first discharge port and is discharged toward the magnetron, And a second guide that forms a part of the second discharge port so as to be discharged toward the high pressure transformer through the second discharge port.

The first guide includes a first partition wall having a shape bent toward the blowing fan. The second guide faces the first partition wall, and has a second partition wall bent toward the fan. .

The first partition wall may include an end portion connected to one end of the curved portion of the second guide having a curved shape along the blowing fan and having a cut-off formed therein.

The second partition may be connected to a bent portion of the first guide having a bent shape along the blowing fan.

A cutoff may be formed at one end of the bent portion of the first guide that is spaced apart from the second guide.

The blowing fan may include a centrifugal fan.

The blowing fan casing may further include a cover which faces the frame and is coupled with the plurality of guides to form the plurality of discharge openings.

A microwave oven according to an embodiment of the present invention includes a magnetron having a cooking chamber and an electric chamber and radiating a microwave into the cooking chamber to be installed in the electric chamber so as to cook food, A high voltage transformer for applying a voltage to the magnetron and a centrifugal fan in the interior of the magnetron, and air introduced into the electric field chamber by rotation of the centrifugal fan is discharged toward the magnetron. And a centrifugal fan casing including a first discharge port and a second discharge port discharged toward the high-pressure transformer.

Wherein the centrifugal fan casing is provided with a frame having a suction port formed therein to allow the air introduced into the electric chamber to be transmitted to the centrifugal fan, and air introduced into the suction port, A plurality of guides protruding toward the centrifugal fan to be discharged through the discharge port and the second discharge port, and a cover coupled with the plurality of guides to form the first discharge port and the second discharge port.

Wherein the plurality of guides are combined with the cover so that air introduced into the centrifugal fan casing passes through the first discharge port and is discharged toward the magnetron to form the first discharge port and a shape bent toward the centrifugal fan A first guide including a first partition wall portion and a second discharge port by being coupled with the cover such that air introduced into the centrifugal fan casing passes through the second discharge port and is discharged toward the high pressure transformer, And a second guide member having a second partition wall spaced apart from the first partition wall and having a shape bent toward the centrifugal fan.

The first partition wall portion may be connected to one end portion of the curved portion of the second guide forming a curved surface along the centrifugal fan and the second partition wall portion may be connected to the curved portion of the first guide forming a curved surface along the centrifugal fan .

The centrifugal fan casing may further include an induction part installed on at least one of the first guide and the second guide so as to be adjacent to at least one of the first discharge port and the second discharge port and protrude toward the cover.

The guide portion may be installed around at least one of the first discharge port and the second discharge port so as to include at least one of the first partition wall portion and the second partition wall portion.

External air flowing into the microwave oven housing can be concentrated to the magnetron and the high-pressure transformer through the first outlet and the second outlet, so that the cooling efficiency of the magnetron and the high-pressure transformer can be improved.

The outside air flowing into the microwave oven housing can be concentrated in the magnetron and the high-pressure transformer through the first outlet and the second outlet, so that it is possible to prevent noise caused by increasing the rotational speed of the blowing fan.

1 is a perspective view showing an appearance of a microwave oven according to an embodiment of the present invention;
2 is a perspective view showing a high-pressure transformer of a microwave oven according to an embodiment of the present invention;
3 is a cross-sectional view of a magnetron of a microwave oven according to an embodiment of the present invention.
FIG. 4 is a perspective view of a blowing fan casing of a microwave oven according to an embodiment of the present invention,
FIG. 5 is a perspective view of a blowing fan casing of a microwave oven according to an embodiment of the present invention,
Fig. 6 is an exploded perspective view of the ventilation fan casing of Fig.
7A and 7B are perspective views illustrating a structure in which a blowing fan is mounted on a frame of a microwave oven according to an embodiment of the present invention,
8 is a view showing the flow of air introduced into the electric room by the blowing fan of the microwave oven according to the embodiment of the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing an outer appearance of a microwave oven according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a high-pressure transformer of a microwave oven according to an embodiment of the present invention. 3 is a cross-sectional view illustrating a magnetron of a microwave oven according to an embodiment of the present invention.

1 to 3, the microwave oven 1 includes a housing 10 having an outer appearance. The housing 10 includes a cooking chamber 20 having a front surface opened to accommodate food, And an electric field chamber 30 in which electric components are installed.

A door 40 is hinged to one side of the housing 10 so as to be able to open and close the cooking chamber 20 and a door 40 which is located in front of the electric room 30 and controls various electric components inside the electric room 30. [ A panel 50 is installed.

The electric field chamber 30 is provided with a magnetron 60 for generating a microwave to be radiated to the cooking chamber 20 and a high-voltage transformer 70, a high-voltage condenser 80, and a high-voltage transformer 70 constituting a drive circuit for driving the magnetron 60, A diode 90 and the like are provided. A blowing fan 100 is provided in front of the electric field chamber 30 to cool the electric components inside the electric field chamber 30 by sucking outside air. The magnetron 60 and the high-pressure transformer 70 may be positioned at the top and bottom of the rear of the blowing fan 100. Specifically, the high-voltage transformer 70 may be installed on the bottom surface of the electric field chamber 30, and the magnetron 60 may be installed on the high-voltage transformer 70.

A high voltage transformer (HVT) 70 receives a commercial AC power (AC 110 V or 220 V) and outputs a high voltage of about 2000 V. This output voltage is supplied to a high voltage capacitor 80 and a high voltage diode 90 And maintains about 4000V. This voltage is supplied to the magnetron 60, and microwaves of 2450 MHz are generated in the magnetron 60.

The high-voltage transformer 70 includes a core 71, a primary coil 72, and a secondary coil 73. Specifically, the high-voltage transformer 70 includes a core 71 formed by laminating a steel sheet such as a silicon steel sheet, permalloy or ferrite, and a primary coil 72 wound around the core 71 and a secondary coil 73 ). The primary coil 72 is provided with an input terminal 74 for receiving a commercial power source and the secondary coil 73 is provided with an output terminal 75 for outputting a high voltage power source. The output voltage at the output terminal 75 is determined by the winding ratio of the primary coil 72 and the secondary coil 73. The core 71, the primary coil 72, the secondary coil 73 and the like are fixed to the bottom of the electric field chamber 30 by the mounting plate 76.

The magnetron 60 is a kind of bipolar tube in which a filament 61, which is a cathode part, is provided in the axial direction, and an anode part formed of a vane 62 and an anode body 63 radially around the filament 61. A current is caused to flow between the center lead 64 and the side lead 65 in the filament 61 which is the negative electrode part to emit a thermoelectromagnet and this hot electron emits high frequency energy by a strong electric field and a magnetic field applied between the cathode and the anode . Since the high frequency energy can not be drawn out to the outside, the heat is dissipated to the outside by the anode body 63 and the cooling fin 66 connected thereto. The heat generated from the cooling fins 66 of the magnetron 60 is usually as high as about 110 ° C.

The operation of the microwave oven 1 will now be described. When food is placed in the cooking chamber 20 and the microwave oven is operated through the control panel 50, the commercial power is supplied to the high-voltage transformer 70 and the commercial power is boosted to approximately 2000 V by the high- This voltage is again backpressed to a high voltage of about 4000 V by the high-voltage capacitor 80 and the high-voltage diode 90, and is transmitted to the magnetron 60. In the magnetron 60, microwaves of 2450 MHz are generated by radiating the microwaves to the cooking chamber 20, and food is cooked by microwaves in the microwave oven.

When the microwave oven 1 is operated, a blowing fan 100 for cooling the heat generated by the magnetron 60 or the high-pressure transformer 70 is operated to circulate the outside air into the electric room 30 A flow of air occurs. The outside air flows into the electric room 30 through the plurality of air inflow holes 11 provided at the upper end of the control panel 50 as the blowing fan 100 rotates. The external air introduced into the electric field chamber 30 flows into the interior of the cooking chamber 20 through a plurality of air moving holes 21 formed in the inner wall of the cooking chamber 20 which forms a boundary with the electric field chamber 30. The outside air introduced into the cooking chamber 20 is discharged to the outside of the housing 10 through the cooking chamber 20 so as to prevent the dew that may be generated inside the cooking chamber 20, do. The plurality of air moving holes 21 may have a size enough to prevent microwaves generated in the magnetron 60 from being discharged to the outside of the cooking chamber 20.

A plurality of air inflow holes 11 through which the outside air flows may be formed at various positions outside the housing 10 and are not limited to the upper end of the control panel 50.

FIG. 4 is a perspective view of a blowing fan casing of a microwave oven according to an embodiment of the present invention, and FIG. 5 is a perspective view of a blowing fan casing of a microwave oven according to an embodiment of the present invention. FIG. 6 is an exploded perspective view of the blowing fan casing of FIG. 4, and FIGS. 7a and 7b are perspective views illustrating structures in which a blowing fan is mounted on a frame of a microwave oven according to an embodiment of the present invention, from different angles. FIG. 8 is a view showing the flow of air introduced into the electric room by a blowing fan of a microwave oven according to an embodiment of the present invention.

As shown in FIGS. 4 to 8, the blowing fan 100 may be housed inside the blowing fan casing 200.

A plurality of discharge ports (260, 270) may be formed in the blowing fan casing (200). Specifically, the plurality of discharge ports 260 and 270 are formed in the first discharge port 260 and the blowing fan 100, through which the air introduced into the electric field chamber 30 by the rotation of the blowing fan 100 is discharged toward the magnetron 60, And a second discharge port 270 through which the air introduced into the electric field chamber 30 is discharged toward the high-voltage transformer 70 by the rotation of the electric motor 30. The first discharge port 260 is formed on the upper portion of the blowing fan casing 200 and the second discharge port 270 is formed on the lower portion of the blowing fan casing 200 so as to correspond to the positions of the magnetron 60 and the high- .

The blowing fan casing 200 may include a frame 210, a plurality of guides 221 and 222, and a cover 230.

A suction port 250 is provided in the frame 210 facing the front of the electric field chamber 30 so that the external air introduced into the electric field chamber 30 is sucked into the inside of the fan casing 200 as the blowing fan 100 rotates . A motor fastening hole 211 may be formed in the front of the suction port 250 to fasten the motor 130 to provide a driving force to rotate the blowing fan 100. The plurality of extension portions 212 extend from the motor fastening hole 211 in the radial direction of the motor fastening hole 211. The suction port 250 may be divided into a plurality of openings 213 by a plurality of extension portions 212. The front surface of the frame 210 is not flat and may have a curved shape.

The plurality of guides 221 and 222 may be provided on the rear surface of the frame 210 so as to protrude toward the rear of the frame 210. Specifically, the plurality of guides 221 and 222 guide air toward the magnetron 60 and the high-pressure transformer 70 located behind the blowing fan casing 200 in accordance with the rotation of the blowing fan 100, And may be formed along the periphery of the blowing fan 100 so as to flow.

The plurality of guides 221 and 222 may include a first guide 221 and a second guide 222.

The first guide 221 can form a part of the first discharge port 260 so that the air introduced into the blowing fan casing 200 passes through the first discharge port 260 and is discharged toward the magnetron 60, The second guide 222 can form a part of the second discharge port 270 so that the air introduced into the blowing fan casing 200 passes through the second discharge port 270 and is discharged toward the high pressure transformer 70 .

The first guide 221 may include a first partition 221a and a first bend 221b. The first bending portion 221b may have a shape bent toward the blowing fan 100 and the first bent portion 221b may have a shape extending from the first partition wall 221a toward the second discharge port 270 Lt; / RTI > The first partition 221a and the first bent part 221b may be formed at both ends of the first guide 221, respectively.

The second guide 222 may include a second partition 222a and a second bent portion 222b. The second bending portion 222b may have a shape bent toward the blowing fan 100 and the second bent portion 222b may have a shape extending from the second partition wall 222a toward the first discharge port 260 Lt; / RTI > The second partition 222a and the second bent portion 222b may be formed at both ends of the second guide 222, respectively.

The first guide 221 and the second guide 222 may be connected to each other. Specifically, the first partition wall 221a may be connected to one end of the second bend section 222b, and the second partition wall 222a may be connected to the first bend section 221b. The second partition wall portion 222a may not be connected to one end of the first bent portion 221b. That is, one end of the first bent portion 221b may be spaced apart from the second guide 222.

Cut offs 221c and 222c may be formed at the end of the first partition wall 221a and the end of the first bend 221b. The external air introduced into the blowing fan casing 200 by the rotation of the blowing fan 100 is partially cut off at the position of the cutoff 221c formed at the end of the first partition wall 221a along the second guide 222 And the remainder is discharged toward the magnetron 60 through the first discharge port 260. The outside air introduced into the blowing fan casing 200 by the rotation of the blowing fan 100 flows along the first guide 221 at a portion of the cutoff 222c formed at the end of the first bent portion 221b, And the remainder is discharged toward the high-pressure transformer 70 through the second discharge port 270.

The cover 230 is positioned in front of the magnetron 60 and the high pressure transformer 70 so as to face the frame 210 and can be combined with the plurality of guides 221 and 222 to form a plurality of discharge ports 260 and 270. The first discharge port 260 may be formed by coupling the first guide 221 including the first partition wall 221a and the cover 230 and the second discharge port 270 may be formed by connecting the second partition wall 222a, The second guide 222 and the cover 230 may be combined.

At least one of the first discharge port (260) and the second discharge port (270) may be provided with an induction unit (240). The induction unit 240 is disposed behind the ventilation fan casing 200 so that external air passing through the first discharge port 260 and the second discharge port 270 can be intensively transmitted to the magnetron 60 and the high pressure transformer 70, . The guide portion 240 may be installed along the entire circumference or a part of at least one of the first discharge port 260 and the second discharge port 270. When the guide portion 240 is installed along a part of the circumference of at least one of the first discharge port 260 and the second discharge port 270, the first partition wall portion 221a and the second partition wall portion 222a may include at least one of the first partition wall portion 221a and the second partition wall portion 222a. To be installed.

The blowing fan 100 accommodated in the blowing fan casing 200 may include a centrifugal fan.

The blowing fan 100 may have a configuration in which a plurality of blades 120 are coupled to a circular plate 110. Specifically, the plate 110 faces the cover 230 of the blowing fan casing 200, and the central portion 111 of the plate 110 protrudes toward the front of the blowing fan casing 200. A through hole 112 may be formed in the central portion 111 so that a rotary shaft 140 having one end connected to the motor 130 may be coupled. The rotation shaft 140 coupled to the through hole 112 of the plate 110 is connected to a motor 130 positioned in front of the frame 210 through a motor coupling hole 211 formed in the frame 210. The blowing fan 100 can rotate about the rotating shaft 140 by the motor 130. [

The number of the plurality of discharge ports 260, 270 and the plurality of guides 221, 222 is not limited to two.

The foregoing has shown and described specific embodiments. However, it should be understood that the present invention is not limited to the above-described embodiment, and various changes and modifications may be made without departing from the technical idea of the present invention described in the following claims .

1: Microwave oven 10: Housing
11: air inflow hole 20: cooking chamber
21: air moving ball 30: electric field room
40: Door 50: Control panel
60: Magnetron 61: Filament
62: Vane 63: anode body
64: center lead 65: side lead
66: cooling pin 70: high voltage transformer
71: core 72: primary coil
73: Secondary coil 74: Input terminal
75: Output terminal 76: Mounting plate
80: High-voltage condenser 90: High-voltage diode
100: blowing fan (centrifugal fan) 110: plate
111: center portion 112: through hole
120: wing 130: motor
140: rotating shaft 200: blowing fan (centrifugal fan) casing
210: frame 211: motor fastener
212: extension part 213: opening
221: first guide 221a: first partition wall portion
221b: first bend section 222: second guide
222a: second partition wall portion 222b: second bend portion
221c, 222c: Cutoff 230: Cover
240: guide part 250: inlet
260: first discharge port 270: second discharge port

Claims

A microwave oven having a cooking chamber and an electric field chamber,
A magnetron disposed inside the electric compartment and radiating a microwave into the cooking chamber to cook food;
A high voltage transformer installed in the electric field chamber and applying a voltage to the magnetron; And
And a plurality of discharge ports including a first discharge port for discharging air toward the magnetron and a second discharge port for discharging toward the high-pressure transformer, wherein the air introduced into the electric field chamber by rotation of the blowing fan is accommodated in a discharge port And a blowing fan casing in which the fan casing is formed.

The method according to claim 1,
The blowing fan casing includes:
A frame having a suction port for transferring the air introduced into the electric compartment to the blowing fan; And
And a plurality of guides provided along the periphery of the blowing fan so that air introduced into the suction port can flow toward the magnetron and the high pressure transformer in accordance with rotation of the blowing fan Microwave oven.

3. The method of claim 2,
The plurality of guides
A first guide which forms a part of the first discharge port so that the air introduced into the blowing fan casing passes through the first discharge port and is discharged toward the magnetron; And
And a second guide that forms a part of the second discharge port so that the air introduced into the blowing fan casing passes through the second discharge port and is discharged toward the high pressure transformer.

The method of claim 3,
Wherein the first guide includes a first partition wall having a shape bent toward the blowing fan,
And the second guide includes a second partition wall facing the first partition wall and having a shape bent toward the ventilation fan.

5. The method of claim 4,
Wherein the first partition wall portion is connected to one end portion of a bent portion of the second guide having a bent shape along the blowing fan and includes an end portion where a cut-off is formed.

6. The method of claim 5,
Wherein the second partition wall portion is connected to a bent portion of the first guide having a bent shape along the blowing fan.

The method according to claim 6,
And a cutoff is formed at one end of the bent portion of the first guide which is spaced apart from the second guide.

The method according to claim 1,
Wherein the blowing fan includes a centrifugal fan.

3. The method of claim 2,
Wherein the blowing fan casing further comprises a cover which faces the frame and forms a plurality of ejection orifices by engaging with the plurality of guides.

A microwave oven having a cooking chamber and an electric field chamber,
A magnetron disposed inside the electric compartment and radiating a microwave into the cooking chamber to cook food;
A high voltage transformer installed in the electric room so as to be positioned below the magnetron and applying a voltage to the magnetron; And
Pressure centrifugal fan casing including a centrifugal fan inside thereof and a first discharge port through which air introduced into the electric field chamber by rotation of the centrifugal fan is discharged toward the magnetron and a second discharge port discharged toward the high- And a microwave oven.

11. The method of claim 10,
In the centrifugal fan casing,
A frame having a suction port for transferring the air introduced into the electric chamber to the centrifugal fan;
A plurality of guides provided inside the frame and having a shape protruding toward the centrifugal fan so that the air introduced into the suction port is discharged through the first discharge port and the second discharge port in accordance with the rotation of the centrifugal fan; And
And a cover coupled to the plurality of guides to form the first discharge port and the second discharge port.

12. The method of claim 11,
The plurality of guides
The first discharge port is formed by engaging with the cover such that air introduced into the centrifugal fan casing passes through the first discharge port and is discharged toward the magnetron, and a first partition wall portion having a shape bent toward the centrifugal fan A first guide comprising; And
And the second discharge port is formed by engaging with the cover so that the air introduced into the centrifugal fan casing passes through the second discharge port and is discharged toward the high pressure transformer, and the second discharge port is separated from the first partition wall toward the centrifugal fan And a second guide including a second partition wall having a bent shape.

13. The method of claim 12,
Wherein the first partition wall portion is connected to one end of a bent portion of the second guide which forms a curved surface along the centrifugal fan,
And the second partition wall portion is connected to a bent portion of the first guide which forms a curved surface along the centrifugal fan.

13. The method of claim 12,
The centrifugal fan casing further includes an induction part installed at at least one of the first guide and the second guide so as to be adjacent to at least one of the first discharge port and the second discharge port and protruding toward the cover Microwave.

15. The method of claim 14,
Wherein the guide portion is provided around at least one of the first discharge port and the second discharge port so as to include at least one of the first partition wall portion and the second partition wall portion.