WO2004041035A1

WO2004041035A1 - Cooling apparatus for electrical cooker

Info

Publication number: WO2004041035A1
Application number: PCT/KR2003/002342
Authority: WO
Inventors: Jong-Bong Kim; Sung-Man Hwang; Yong-Ho Lee
Original assignee: Lg Electronics Inc.
Priority date: 2002-11-06
Filing date: 2003-11-04
Publication date: 2004-05-21
Also published as: AU2003276732A1

Abstract

A cooling apparatus for an electrical cooker includes a case receiving an oven therein, and having an inlet (24) and an outlet (26) at its bottom surface respectively; a power PCB (34) positioned at the rear portion of the case; a cooling plate (50) attached to a heat generating device of the power PCB (34); a cooling fan (42) installed at an inlet (24) of the case and at a position having a certain distance from a lower end portion of the power PCB (34) in a horizontal direction, and sucking outer air; and a support means for supporting an oven installed in the case. The cooling apparatus can improve cooling capacity, make a wiring work between a display unit (14) and a power PCB (34), easy and reduce the whole height of a main body.

Description

COOLING APPARATUS FOR ELECTRICAL COOKER

TECHNICAL FIELD

The present invention relates to an electrical cooker, and particularly to

a cooling apparatus for an electrical cooker capable of improving cooling

capacity for various circuit parts mounted at a PCB and reducing a whole

height of the electric cooker.

BACKGROUND ART

In general, an electrical cooker is an apparatus for performing cooking,

using electricity as a heating source, and for rapidly cooking food by

maintaining the inside of an oven at high pressure by making a heating

temperature higher than that under normal pressure.

Figure 1 is a sectional view of an electrical cooker according to the

conventional art.

As shown therein, a conventional electrical cooker includes a main

body 102 in which an oven 104 is mounted, and a lid 108 connected with a

hinge portion 106 at an upper part of the main body 102, and opening/closing

the main body 102 by rotating centering on the hinge portion 106.

In the main body 102, an electrical heating apparatus 110 for heating

the oven 104 is provided. The electrical heating apparatus 110 includes a

working coil generating an induced current in cooking, a heater generating

relatively small heat in keeping cooked food warm, and a heating vessel 112 at which the oven 104 is inserted.

According to the electrical cooker above, the oven 104 is heated by the

electrical heating apparatus 110 thereby performing cooking. Since, during a

cooking process, an inner portion of the lid 108 is adhered to an upper end of

the oven 104, and a steam discharging valve maintains a closed state thereof,

when steam is generated in boiling water, pressure in the oven 104 becomes

greater than normal pressure.

As pressure gets greater, a temperature of water gets higher than the

boiling points (100 degrees) under normal pressure, so that food is cooked

quickly. When the cooking process is terminated, a steaming process of

maintaining pressure in the oven 104 in a state that heating performed by the

electrical heating apparatus 110 has been stopped, progresses for a certain

time. After the steaming process has been terminated, a constant warming

process progresses, which is that the oven 104 is weakly heated at a certain

temperature by the electrical heating apparatus 110 in a state that steam in

the oven 104 has been discharged to the outside and thus pressure in the

oven 104 has been lowered.

At a front surface of the main body 102, a display window 114 for

displaying an operational state and the like of the electrical cooker is provided,

and, at the inside of the display window 114, a display PCB 116 having an

LCD 118 or the like is mounted. At a rear portion of the display PCB 116, a

power PCD 120 for controlling operations of the display PCB 116 and the

electrical heating apparatus 110 is mounted. Also, at the bottom surface of the main body 102, a cooling fan 126 for protecting the power PCB 120 from a

high temperature the electrical heating apparatus 110 generates, is provided.

Herein, Figures 2 and 3 are a side view and a back view showing the

power PCB 120 respectively. In the power PCB 120, various devices 130,

132 and 134 including a semiconductor device are provided on a substrate

128 to control various apparatuses.

Since these various devices 130, 132 and 134 are high temperature

heat generating devices, there is a need for cooling these devices to be

operated normally. According to this, a cooling pin 124, what is called a heat

sink, is attached at a main heat generating device 134 in order to cool the

device with an enlarging cooling area.

Herein, the cooling pin 124 has a structure that a plurality of sheets

with a plate form is collocated at certain interval therebetween, enlarges

heat-transmitted area and cools heat generated at the heat generating device

134, performing heat-exchange with air flowed by the cooling fan 126

However, in the conventional electrical cooker constructed as above,

the display unit for indicating a state of the cooker to a user is installed at the

front portion of the main body 102. In case that the display unit is installed at

the lid 108 in order that the user can easily check the display unit with the

naked eye, since the power PCB 120 is provided at the front surface of the

main body 102, an electric wire for connecting the display PCB 116 and the

power PCB 120 has to be connected to the display PCB 116 from the front

portion of the main body 10 via the rear of the main body 102 and the hinge portion 106. Accordingly, the length of the electric wire is lengthened, and inside wiring is not easy.

Also, in the conventional electrical cooker, in order to sufficiently cool a

heat generating device 34, a main heat generating source, a cooling area of

the cooling pin 124 has to be large. Also, in order to make outside air flowed

in the case through the cooling fan 126 concentrated toward the cooling pin

124, the cooling fan 126 has to be installed right under the cooling pin 124.

However, in case that the cooling fan 126 is installed right under the cooling

pin 124, a certain distance between the cooling fan 126 and the cooling pin

124 has to exist in a vertical direction, and thus a whole height of the cooker

becomes higher.

Also, in case that the cooling fan 126 is not installed right under the

cooling pin 124, since a special apparatus for making an outside air, which is

flowed in the case through the cooling fan 126, concentrated toward the

cooling pin 124 is not provided, sufficient cooling efficiency for the heat

generating source can not be obtained.

Also, since the cooling pin 124 can have sufficient cooling capability

when a surface area coming in contact with air is large, the whole volume of

the cooling pin 124 becomes greater as much, and so the cooling pin 124

greatly occupies an inner space of the cooker. Accordingly, a plan and a

disposition for the inside of the cooker are not easy, and since the cooling pin

124 has a limit to increasing heat-exchange efficiency, it is not suitable for a

device generating high temperature heat. DISCLOSURE OF THE INVENTION

Therefore, it is an object of the present invention to provide a cooling

apparatus for an electrical cooker capable of reducing the whole height of a

main body as well as making a wiring work between a display unit and a

power PCB easy, by positioning a power PCB at the rear portion of a main

body, and positioning a cooling fan near the front of the power PCB, in case

that the display unit is installed at a lid.

It is another object of the present invention to provide a cooling

apparatus for an electrical cooker capable of being assembled and produced

easily, by simplifying its whole structure as well as improving cooling

efficiency for a heat generating source by forming a guide structure at one

portion of a tripod so as to concentratedly cool a heat generating device of the

power PCB, and integrally installing a cooling fan at the guide.

It is another object of the present invention to provide a cooling

apparatus for an electrical cooker capable of making parts mounted in the

cooker easily planned and disposed, and reducing production expenses of a

product, by improving cooling capacity with respect to a heat transmitting area

by reforming a structure of a cooling pin, and so being able to reducing a

volume of the cooling apparatus.

To achieve the above object, there is provided a cooling apparatus for

an electrical cooker including a case receiving an oven therein, and having an

inlet and an outlet at its bottom surface; a power PCB positioned at the rear portion of the inside of the case; a cooling plate attached to a heat generating

device of the power PCB; a cooling fan installed at an inlet of the case, and

sucking outer air; and a support means supporting an oven in the case, and

inducing air sucked through the cooling fan toward the cooling plate.

An outlet is formed at a rear surface of the case where the power PCB

is mounted, and the inlet is formed at a rear portion of the bottom surface, and

the outlet is formed at a front portion of the bottom surface.

At the cooling plate, a turbulator for guiding air flowed by the cooling

fan so that the air can be concentrated at a portion of the cooling plate, which

is adhered to the heat generating device, while passing over the turbulator, is

installed.

The support means includes a support portion for supporting an oven

in the case; and a guide portion integrally extended from the support portion,

and guiding air flowed in the case through the cooling fan toward the cooling

plate.

In a cooling apparatus for an electrical cooker according to the present

invention, at the inside of the case, a support plate having a plurality of air

passing holes is installed; the support means includes a support portion for

supporting an oven in the case, and a guide portion integrally extended from

the support portion, and guiding air flowed in the case through the cooling fan

toward the cooling plate; and thus air sucked through the inlet is discharged to

an outlet of the case via the cooling fan, the guide portion, the cooling plate, a

back air passing hole of a support plate, and a front air passing hole of the support plate.

A cooling apparatus for an electrical cooker includes a case receiving

an oven therein, and having an inlet and an outlet at its bottom surface

respectively; a power PCB positioned at the rear portion of inside of the case;

a heat sink attached to a heat generating device of the power PCB; a cooling

fan installed at the inlet of the case and at a position having a certain distance

from a lower end portion of the power PCB 34 in a horizontal direction, and

sucking outer air; and a support means for supporting an oven installed in the

case.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a longitudinal sectional view showing an inner structure of

an electrical cooker according to the conventional art;

Figure 2 is a side view showing a cooling structure of a cooling

apparatus according to the conventional art;

Figure 3 is a front view showing a cooling structure of a cooling

apparatus according to the conventional art;

Figure 4 is a longitudinal sectional view showing an electrical cooker

having a cooling apparatus according to the present invention;

Figure 5 is a bottom view showing a bottom plate of an electrical

cooker according to the present invention;

Figure 6 is a back view showing a cooling structure of a power PCB of

an electrical cooker according to the present invention; Figure 7 is a side view showing a cooling structure of a power PCB of

an electrical cooker according to one embodiment of the present invention;

Figure 8 is a front view showing a cooling structure of a power PCB of

an electrical cooker according to one embodiment of the present invention;

Figure 9 is a perspective view showing a support apparatus of an

electrical cooker according to the present invention;

Figure 10 is a side view showing a PCB cooling structure of an

electrical cooker according to another embodiment of the present invention;

and

Figure 11 is a front view showing a PCB cooling structure of an

electrical cooker according to another embodiment of the present invention.

MODES FOR CARRYING OUT THE PREFERRED EMBODIMENTS

Hereinafter, an embodiment of a cooling apparatus for an electrical

cooker according to the present invention will now be described with

reference to accompanying drawings.

There can be a plurality of embodiments of a cooling apparatus for an

electrical cooker according to the present invention, and hereinafter a

preferred embodiment will be described.

Figure 4 is a longitudinal sectional view showing an electrical cooker

having a cooling apparatus according to the present invention, and Figure 5 is

a bottom view of an electrical cooker according to the present invention.

An electrical cooker according to the present invention includes a main body 2 in which an oven 4 is mounted, an electrical heating apparatus 5

installed at a lower portion of the main body 2 to heat the oven 4, and a lid 8

connected to an upper portion of the main body by a hinge portion 6, and

opening/closing the main body 2 by rotating centering on the hinge portion 6.

At the lid 8, a display unit 14 is provided so that a user can easily check

a state of a cooker and also operate the cooker. The display unit 14 includes

a display window 16 installed at the lid 8 and a display PCB 18.

The main body 2 includes a case 22 including a bottom plate 20 so as

to form an enclosure of the cooker. At the bottom plate 20 of the case, an inlet

25 and a first outlet 26 are formed respectively so that outer air can be sucked

and then discharged. Also, at the rear side of the case 22, a second outlet 28

is formed so that inner air can be discharged to the outside of case.

Herein, as shown in Figure 6, the inlet 24 is formed at a relatively rear

portion of the bottom plate 20, and the first outlet 26 is formed at both sides of

the front portion of the bottom plate 20. To be sure, preferably, the inlet 24

and the outlet 26 have a screen structure so that alien substances and the

like are not flowed into the case 22.

The electrical heating apparatus 5 includes a working coil 10

generating an induced current in cooking, a heater generating relatively small

heat in keeping cooked food warm, and a heating vessel 12. Herein, at the

outside of the heating vessel 12, the working coil 10 is installed, and at the

inside thereof, the oven 4 is inserted.

In order to support the heating vessel 12 in which the oven 4 is inserted, a support apparatus is provided. The support apparatus includes a

support plate 30 installed between a circumference of the heating vessel 12

and an inner surface of the case 22, and a tripod type support body 70 fixed

to the support plate 30 by a coupling means such as a screw or the like, and

supporting a lower portion of the heating vessel 12.

The support plate 30 has a plurality of air passing hole 32 so that air

flowed in the case through the inlet 24 passes through an upper space of the

main body, and then can be discharged to the outside through the outlet 26.

At the rear portion of the case 22, a power PCB 34 is vertically erected

and fixed so as to control the cooker by being connected to the display PCB

14 and the working coil 10 and the like by an electric wire 40.

In order to cool the power PCB 34 with an air cooling method, a cooling

fan is provided at the inside of the inlet 24 and at a position having a certain

distance from a lower end portion of the power PCB 34 in a horizontal

direction so as to forcedly suck outer air.

Figure 7 is a side view of a power PCB according to one embodiment

of the present invention, and Figure 8 is a front view according to one

embodiment of the present invention.

The power PCB 34 includes a substrate 46 mounted at a rear side of

the case 22 by support brackets 36 and 38, and various devices 47, 48 and

49 including a semiconductor device, mounted on the substrate 46 and

controlling various apparatuses.

Herein, the various devices 47, 48 and 49 are heat generating devices generating high temperature heat during operation, and so in order that the

semiconductor and the like can be operated normally, a cooling plate 50 and

a turbulator 52 are provided.

Herein, the cooling plate 50 is adhered and fixed to the heat generating

devices 49 of the power PCB 34, and expands a cooling area. The turbulator

52 is mounted at the cooling plate 50, and guides air flowed by the cooling fan

42 so that, going over the turbulator 52, the air can be concentrated at a

portion of the cooling plate 50 which is adhered to the heat generating device

49.

To be sure, both cooling plate 50 and turbulator 52 are made of a

metal material having great heat conductibility, and the cooling plate 50 has a

single plate structure having a certain thickness.

In the cooling plate 50 above, the back of its one side end portion is

adhered and fixed to the heat generating device, and at the front of its other

side end portion, the turbulator 52 is installed. Thusly, the cooling plate 50 has

a clank structure.

The turbulator 52 has a protrusion form protruded from the surface of

the cooling plate 50. In the present embodiment, three turbulators collocated

at a predetermined interval therebetween are illustrated, however, the

number of turbulators may be one, two or even more than four.

In the embodiment of the present invention, it is illustrated that the

turbulator 52 has a hexahedron type block structure, however, the structure of

the turbulator can be variously varied according to operation conditions or plan conditions.

That is, the front part of the turbulator 52 may be formed in a curved

surface form in an air flowing direction so that flow resistance can be reduced,

or at the rear part of the turbulator 52, a guide may be extended long up to the

part where air has to be concentrated.

The cooling fan 42 is integrally fixed and installed at the tripod type

support body 70. At this time, the cooling fan 42 is positioned at a lower

portion of the heating vessel 12, and the power PCB 34 is positioned at the

rear of a side surface of the heating vessel 12.

Herein, as shown in Figure 9, three feet 72, 74 and 76 of the support

body 70 are disposed in a radial form so as to support the heating vessel. At

one 76 of the three feet, the cooling fan 42 is mounted, and the foot 76 guides

air flowed by the cooling fan 42 so that the air can be concentrated at the side

surface of the heating vessel 12 and thus be introduced toward the heat

generating device 49.

That is, the support body 70 is provided with two support feet 72 and

74 for supporting the heating vessel 12 in the case 22, and a guide foot 76

integrally connected to the support feet 72 and 74, supporting the heating

vessel with the support feet, and guiding air flowed in the case through the

cooling fan 42 toward the cooling plate 50.

At an end of each foot 72, 74 and 76 of the support body 70, a flange

portion 78 is formed so as to fix the tripod to the support plate 30 by a screw

or the like. The guide foot 76 includes a fan-mounted portion 80 having a four-

cornered box form so that the cooling fan 42 can be integrally installed, and a

guide portion 82 extended upwardly from the fan-mounted portion 80 along

the heating vessel 12, And, the width of the guide foot 76 is relatively greater

than those of the two support foot 74 and 76.

At the tripod type support body 70, the cooling fan 42 is mounted, and

one of the feet of the support body 70 becomes a guide foot 76 for making air

flowed by the cooling fan 42 concentrated toward the cooling plate 50. For

this reason, an installation structure of the cooling fan 42 is simplified, and,

without installing a special air guiding fabrication, air can be concentrated

toward the cooling plate 50 as well. Accordingly, cooling efficiency for the

power PCB 34 including the heat generating device 49 can improved.

Also, the cooling fan 42 is not disposed right under the power PCB 34

and the cooling plate 50, but is disposed at the lower side of the heating

vessel. For this reason, without extending the whole height of the cooker, the

sizes of the power PCB 34 and the cooling plate 50 can be sufficiently

enlarged according to the plan condition.

Operations of the cooling apparatus for an electrical cooker according

to the present invention constructed as above will now be described.

When the cooling fan 42 is operated, outer air is flowed into the case

22 through an inlet 24 of a bottom plate 20. The flowed air passes through the

cooling fan 42 and then flows toward the cooling plate 50 and the power PCB

34 by guiding of the guide foot 76 of the support body 70. During this flow, heat-exchange of the air and the cooling plate 50 is occurred and thus the

power PCB 34 and the heat generating device 49 are cooled.

At this time, a part of the air flowing toward the cooling plate 50 goes

over the turbulator 52 with colliding against the turbulator 52, and then is

concentrated to a portion of the cooling plate 50,which is adhered to the heat

generating device 49.

Accordingly, since cooling air is concentrated at the portion adhered to

the heat generating device 49 and so having a relatively higher temperature

than at the other portions, heat transmission efficiency becomes higher at the

high temperature portion, and thus the heat generating device 49 is

effectively cooled.

A part of air which has performed a cooling operation is discharged to

the outside through a second outlet 28 positioned at the rear of the power

PCB 34. Remaining air flows to an upper space of the main body 2 through a

back air passing hole 32 of the support plate 30, then flows to a lower space

of the main body 2 through a front air passing hole 32 of the support plate 30,

and then is discharged to a lower portion of both sides of the cooker through

first outlets 26.

Figure 10 is a side view and also a detail drawing showing a heat

generating device cooling structure according to another embodiment of the

present invention, and Figure 11 is a front view showing a heat generating

device cooling structure according to another embodiment of the present

invention. Various devices 93, 94 and 95 installed at a substrate 92 of the power PCB 90 are heat generating devices generating high temperature heat during operation. So, a porous cooling plate 96, a cooling means is provided

in order that a semiconductor device, which is a heat generating device, and

the like can be normally operated.

The porous cooling plate 96 is made of a porous metal material, and is

adhered to the heat generating device 95, and cools heat generated from the

heat generating device 95.

Herein, the porous cooling plate 96 has a plurality of holes so that

heat-exchange can be performed while air forcedly flowed by the cooling fan

42 passes through the holes. That is, preferably, the porous cooling plate 96

is formed by zigzag and consecutively attaching a wire to the substrate 92

with a predetermined space between the wires.

Operations of a heat generating device cooling apparatus of the

cooker according to another embodiment of the present invention constructed

as above will now be described.

When the cooker is operated, an electrical heating apparatus is

operated, and the cooling fan 42 for cooling the power PCB and the like in the

main body 2 is operated as well.

When the cooling fan 42 is operated, outer air is flowed into the main

body 2, and the flowed air flows toward the porous cooling plate 96 adhered

to the heat generating device 95 of the power PCB 90.

Herein, since, at the porous cooling plate 96, a plurality of holes is

formed, and so an area being in contact with air is more obtained than that of the conventional cooling pin, so that heat transmission efficiency is improved,

and thus the heat generating device 95 can be effectively cooled.

That is, on the assumption that the porous cooling plate of the present

invention and the conventional cooling plate have the same size, the heat

transmission efficiency of the conventional plate is 15 ~ 22%, but the heat

transmission efficiency of the porous cooling plate is 90~100%. Accordingly,

the porous cooling plate 96 can cool a high temperature heat generating

device more effectively than the conventional cooling plate.

Thereafter, air, which has cooled the heat generating device 95 and

the porous cooling plate 96, cools the inside of the main body 2, with flowing

along an air flowing direction, and then is discharged to the outside.

In an cooling apparatus for a cooker according to the present invention

constructed and operated as above, since, in a condition that a displaying unit

is installed at a lid, a power PCB is positioned at the rear portion of a main

body, and a cooling fan is positioned in front of the power PCB, wiring

between the display unit and the power PCB becomes easy and the whole

height of the main body can be reduced as well.

Also, in the present invention, a guide structure is formed at a part of a

tripod type support body for supporting an oven so as to concentrated ly cool a

heat generating device of the power PCB, and a cooling fan is integrally

installed at the guide. For this reason, cooling efficiency for a heat generating

source is improved, and, since the whole structure of the cooker is simplified,

a product can be assembled and produced easily as well. In addition, since the cooling apparatus is constructed so as to cool a

heat generating device with using a cooling plate and a turbulator, cooling

efficiency with respect to a cooling area is maximized.

In addition, since the cooling apparatus is constructed so as to cool a

heat generating device with using a porous heat sink, cooling efficiency with

respect to a volume can be increased, thus a high temperature heat

generating device can be easily cooled, and a plan and a disposition for the

inside of the cooker becomes easy, too.

It will be apparent to those skilled in the art that various modifications

and variations can be made in the present invention without departing from

the spirit or scope of the invention. Thus, it is intended that the present

invention cover modifications and variations of this invention provided they

come within the scope of the appended claims and their equivalents.

Claims

1. A cooling apparatus for an electrical cooker comprising;

a case receiving an oven therein, and having an inlet and an outlet at

its bottom surface;

a power PCB positioned at the rear portion of the inside of the case;

a cooling plate attached to a heat generating device of the power PCB;

a cooling fan installed at an inlet of the case, and sucking outer air; and

a support means supporting an oven in the case, and inducing air

sucked through the cooling fan toward the cooling plate.

2. The apparatus of claim 1 , an outlet is formed at the rear portion

of the case where the power PCB is mounted.

3. The apparatus of claim 1 , wherein, in the case, the inlet is

formed at a rear portion of the bottom surface, and the outlet is formed at a

front portion of the bottom surface.

4. The apparatus of claim 3, wherein the outlet is formed at both

sides of the bottom surface of the case.

5. The apparatus of claim 1 , wherein the heat generating device is

a semiconductor device.

6. The apparatus of claim 1 , wherein the cooling plate is provided

with a turbulator for guiding air flowed by the cooling fan so that the air can

pass over the turbulator, and can be concentrated at a portion of the cooling

plate, which is adhered to the heat generating device.

7. The apparatus of claim 6, wherein the back side of the cooling

plate is adhered to the heat generating device, and, at the front side thereof,

the turbulator is installed.

8. The apparatus of claim 6, wherein the turbulator has a

protrusion form protruded to an upper surface of the cooling plate.

9. The apparatus of claim 6, a turbulator is provided with plural

numbers of turbulators disposed at a determined interval therebetween.

10. The apparatus of claim 1, wherein the supporting means

comprising:

a support portion for supporting an oven in the case; and

a guide portion integrally extended from the support portion, and

guiding air, which has been flowed into the case through the cooling fan,

toward the cooling plate.

11. The apparatus of claim 10, wherein the support unit has a tripod

structure, and one of three feet is the guide portion.

12. The apparatus of claim 10, wherein, at the guide portion, the

cooling fan is fixed.

13. The apparatus of claim 1, wherein at the inside of the case, a

support plate having a plurality of air passing holes is installed.

14. The apparatus of claim 13, wherein the support means is fixed

to the support plate by a coupling means.

15. The apparatus of claim 1 , wherein at the inside of the case, a

support plate having a plurality of air passing holes is installed;

the support means comprises a support portion for supporting an oven

in the case, and a guide portion integrally extended from the support portion ,

and guiding air flowed in the case through the cooling fan toward the cooling

plate; and thus

air sucked through the inlet is discharged to an outlet of the case via

the cooling fan, the guide portion, the cooling plate, a back air passing hole of

a support plate, and a front air passing hole of the support plate.

16. The apparatus of claim 1, wherein the cooling fan is positioned at a lower part of the oven, and the cooling plate is positioned at a rear of the

oven.

17. The apparatus of claim 1, wherein the support means has a

concave tripod structure, and one of three feet includes a support apparatus

formed in a guide structure so as to guide air flowed by the cooling fan to be

concentrated toward a side surface of the oven.

18. The apparatus of claim 17, wherein at an end of the tripod, a

flange portion is formed so as to fix the tripod to an inner fabrication of the

cooker.

19. The apparatus of claim 17, wherein, at the guide, a cooling fan

is integrally installed.

20. The apparatus of claim 17, wherein the width of the guide is

relatively wider than that of other feet where the guide is not formed.

21. A cooling apparatus for an electrical cooker comprises:

a case receiving an oven therein, and having an inlet and an outlet at

its bottom surface respectively;

a power PCB positioned at rear portion of the inside of the case;

a heat sink attached to a heat generating device of the power PCB; a cooling fan installed at the inlet of the case and at a position having a

certain distance from a lower end portion of the power PCB 34 in a horizontal

direction, and sucking outer air; and

a support means for supporting an oven installed in the case.

22. The apparatus of claim 1 , wherein the cooling plate is made of a

porous material, and is adhered to the heat generating device to cool heat

generated at the heat generating device.

23. The apparatus of claim 22, wherein the cooling plate has a

plurality of holes so that heat transmission can be performed while air forcedly

flowed by the cooling fan passes through the holes.