KR102481609B1 - A home appliance and a control unit cooling system installed therein - Google Patents

Abstract

The present invention relates to a structure for cooling an operation unit that is located in front of a cooking appliance and disposed close to a heat source of the cooking appliance and requires cooling, and to a cooking appliance in which the same is installed, a case (50) having an open top and having a predetermined space. ); an upper plate portion 2 coupled to the upper portion of the case 50 to shield the open upper portion of the space and having a surface on which food is seated; a first cooking heating unit 8 accommodated in a first space provided inside the case and heating food seated on the upper plate; a second cooking heating unit 9 accommodated in a second space adjacent to the first space inside the case and heating food seated on the upper plate; an operation unit assembly (6) disposed across the first space and the second space; and a first fan 96 adjacent to the control unit assembly 6 and installed in the second space, and a portion of the air introduced into the second space inside the case by the first fan 96. is a complex cooking appliance that flows into the first space through the inner space of the control unit assembly 6.

Description

Cooling structure of control unit and home appliance installed with it {A HOME APPLIANCE AND A CONTROL UNIT COOLING SYSTEM INSTALLED THEREIN}

The present invention relates to a cooking appliance, and more particularly, to a structure for cooling a control unit that is located in front of the cooking appliance and disposed close to a heat source of the cooking appliance and requires cooling, and to a cooking appliance in which the same is installed.

In general, a cooking appliance is a device that cooks food by generating heat using gas or electricity.

Representative cooking appliances using electricity include induction heating cooking appliances. In general, an induction heating cooker causes a high-frequency current to flow through a working coil or a heating coil, and when the strong magnetic force lines generated by this flow pass through the cooking container, eddy current flows and the container itself is heated. It is an electric cooking device that performs a cooking function in a way.

Looking at the basic heating principle of such an induction heating cooker, as current is applied to the heating coil, food in the container is cooked by generating heat by induction heating of the cooking container itself, which is a magnetic material. Therefore, induction heating cookers do not require combustion of gas, so combustion exhaust gas is not generated, and heat is generated immediately in the container itself, so the transfer process through heat radiation or conduction is minimized, so that food can be heated quickly. There are advantages.

However, such an induction heating cooker may have limitations in thermal power due to an increase in power usage cost due to a large amount of power consumption when driving a plurality of heating coils at the same time and a heating problem of a circuit that controls the heating coils. there is a problem.

On the other hand, as a representative cooking appliance using gas, there is a gas range. In general, a gas range is an open flame type in which a burner is exposed to the outside of the product and the flame directly heats the food or a container containing the food, and the burner is provided inside the product, and heats the radiator using combustion heat. It is divided into a radiant type that heats the cooking food or the container containing the cooking food by using the radiant wave emitted to the outside from the radiant body.

Korean Patent Laid-open Publication No. 10-2008-0069449 has a structure in which the upper surface of the case is shielded by a ceramic plate, and a burner system ignited by supplying gas is provided in the space inside the case below the ceramic plate, and an operation switch is provided. Disclosed is a heating cooking appliance capable of adjusting heat power by opening and closing a gas valve through manipulation of a gas valve.

Technology using gas, such as the radiant type, uses heat generated by the combustion reaction of fuel for cooking, so heat energy can be used very efficiently, and fuel costs can be reduced by using gas that is cheaper than electricity. There is an advantage to being

However, since the heat transfer path in this method is longer than that of the induction heating method, it cannot heat food more rapidly than the induction heating cooking device. In addition, since this method burns fuel such as gas, combustion exhaust gas is always generated.

Cooking appliances of the induction heating method and the fuel combustion method can provide various conveniences to users when used together in that the advantages of one method compensate for the disadvantages of the other method.

Meanwhile, induction heating or radiant type fuel combustion cooking appliances are all installed under a top plate made of ceramic glass or the like, and cooking containers or food are placed on the top plate. Also, for a sophisticated appearance, a control unit and a display unit for manipulating the cooking appliance and displaying the operation of the cooking appliance are generally provided on the front portion of the top surface of the top plate. These control parts and display parts are provided on the PCB installed under the ceramic glass. In addition, it is preferable that the control unit and the display unit are installed further forward than the cooking zone in order to allow the user to conveniently operate and conveniently check the operating state of the current cooking appliance.

In the case of a combined cooking appliance using different heat sources, since the components for operating different heat sources are all placed inside one cooking appliance, the internal space of the cooking appliance is limited compared to a cooking appliance using a single heat source method. lack. Therefore, it is highly necessary that the control unit and the display unit be installed in a position in close contact with the foremost part of the cooking appliance. However, it is not easy to cool electric appliances located at the forefront inside a case of a cooking appliance to which a cooling structure in which high-temperature exhaust gas must be discharged to the rear by using a gas combustion method is applied.

In addition, in the case of complex cooking appliances that use different heat sources, since there are differences in the heating method and pattern of the different heat sources, the structure for cooling them must also be differentiated, and implementing independent cooling for cooling efficiency is essential. can be advantageous

On the other hand, a power supply unit for controlling power supplied to different heating units may be used in common in order to save space, and it may be installed in any one of the installation spaces of the two heating units. In this case, when a common component is applied, the corresponding component (power supply unit) always operates even if only one of the heating units of different heating methods is used. Therefore, even when only the heating unit in the space where the power unit is not installed operates, the cooling structure of the inactive heating unit must also be operated to cool the power unit installed in the space where the inactive heating unit is disposed. However, this cooling structure has a problem in that it ignores the purpose of implementing independent cooling.

The present invention has been made to solve the problems of the prior art described above, and an object of the present invention is to provide a cooling structure for a cooking appliance that can smoothly cool a display input board installed at the forefront of a cooking appliance that cannot be cooled smoothly. to be

Another object of the present invention is to provide a cooking appliance having a cooling structure capable of preventing a display input substrate disposed close to a hot heat source from being affected by a heat source in a combined cooking appliance.

In addition, the present invention is to provide a cooking appliance that can be smoothly cooled without a separate fan for cooling electric appliances that must always be cooled regardless of which heating unit of the heating method operates in the combined cooking appliance. The purpose.

In order to solve the above problems, the present invention, the upper portion is open, the case 50 having a predetermined space; an upper plate portion 2 coupled to the upper portion of the case 50 to shield the open upper portion of the space and having a surface on which food is seated; a first cooking heating unit 8 accommodated in a first space provided inside the case and heating food seated on the upper plate; a second cooking heating unit 9 accommodated in a second space adjacent to the first space inside the case and heating food seated on the upper plate; a space part 55 communicating between the first space and the second space; and a first fan 96 adjacent to the space 55 and installed in the second space, wherein a portion of the air introduced into the second space inside the case by the first fan 96 is Provided is a complex cooking appliance that flows into the first space through the space part. Therefore, only the operation of the first fan can cause air flow for cooling in the second space, the space portion, and the first space.

The second cooking heating unit 9 may include a different type of heat source than the first cooking heating unit. The first cooking heating unit 8 may use an induction heating type heat source, and the second cooking heating unit 9 may use a gas combustion type heat source. Considering that the heat source of the gas combustion method installed in the second space has a higher calorific value, the first fan may also use a high-capacity fan, and the high-capacity fan may cover the first space and the space portion.

Since the first space and the second space are spatially partitioned by the barrier 7, it is possible to isolate the two spaces with a simple structure, and accordingly, it is possible to independently design and cool the cooling structure of each space.

The space portion 55 is an operation unit accommodation unit, and the operation unit assembly 6 may be accommodated in the operation unit accommodation unit. The control unit assembly has a structure that must always operate regardless of which of the two heating units 8 and 9 is in operation, and is mainly installed in front of the cooking appliance for reasons of convenience of operation, etc., and when the part operated by a person becomes hot, the user Since the quality sensitivity is lowered, it should always be managed so as not to overheat. Therefore, when it is installed in the space, cooling can be performed smoothly by the air flowing between the first and second spaces. In particular, if air always flows in the space regardless of which heating unit 8 or 9 is operated, the operation unit assembly can be cooled at all times.

The operation unit assembly is an elongated assembly whose length in the left-right direction is longer than the width in the front-back direction, and is disposed in front of the case 50 . This is a structure to be installed in a narrow inner space of the case 50 in which all of the accessories and electrical components used for two or more heating methods are accommodated.

An elastic body 70 for elastically biasing the operation unit assembly upward is provided at the center of both sides of the operation unit assembly 6 to stably and elastically support the operation unit assembly.

Here, the operation unit assembly may be disposed across the first space and the second space. According to this arrangement, the leftover space can be utilized to solve the problem of the narrow space inside the case, and the control unit assembly can be smoothly cooled by the flow of air flowing in and out of the two spaces.

An opening is provided in the portion of the control unit assembly facing the first fan 96 so that air from the first fan is smoothly introduced into the control unit assembly, so that the control unit assembly and its vicinity can be smoothly cooled.

In particular, when the internal space of the operation unit assembly communicating with the opening communicates with the first space, the flow of the first fan for cooling the second space is introduced into the first space, so that the cooling structure of the first space Even in a state where is not operating, cooling of the component to be cooled disposed in the first space is possible to some extent.

The first space includes a third fan 85 installed adjacent to the space part 55, and the air discharge direction of the third fan 85 is in a direction away from the space part 55. , the air in the space part 55 can be induced to flow into the first space.

Here, the control unit assembly 6 is installed in a substrate holder 61 to which the first substrate 60 facing the bottom surface of the upper plate is fixed, and a lower portion of the substrate holder 61, and the substrate holder 61 It may include a holder support bracket 62 provided with a substrate fixing part 625 disposed spaced apart from the. A second substrate 601 may be installed on the substrate fixing part 625 .

That is, the operation unit assembly 6 has a two-layer structure and a first board and a second board are installed thereto, so that they can be installed compactly and cooled smoothly. In particular, this structure is advantageous for using the first substrate as a display and input substrate. In addition, since the second substrate is disposed adjacent to the lower portion of the first substrate, it is advantageous for the second substrate to control the first substrate. In addition, since the second substrate spans the first space and the second space, it is advantageous to control the first cooking heating unit 8 in the first space and the second cooking heating unit 9 in the second space.

In the first space, a component to be cooled 88 that operates when at least one of the first cooking heating unit 8 and the second cooking heating unit 9 is in operation is installed. In particular, a part of the air introduced into the case by the first fan 96 flows in the second space, cools the second cooking heating unit 9, and can be discharged to the outside of the case, so that the first cooking The cooling structure of the first space when the heating unit 8 is in operation, and the cooling structure of the second space when only the second cooking heating unit 9 is in operation can cool the component to be cooled (88).

In addition, the present invention, the upper portion is open, the case 50 having a predetermined space; an upper plate portion 2 coupled to the upper portion of the case 50 to shield the open upper portion of the space and having a surface on which food is seated; a first cooking heating unit 8 accommodated in a first space provided inside the case and heating food seated on the upper plate; a second cooking heating unit 9 accommodated in a second space adjacent to the first space inside the case and heating food seated on the upper plate; an operation unit assembly (6) disposed across the first space and the second space; and a first fan 96 adjacent to the control unit assembly 6 and installed in the second space, and a portion of the air introduced into the second space inside the case by the first fan 96. provides a complex cooking appliance that flows into the first space through the inner space of the control unit assembly (6).

The operation unit assembly 6 may be provided at the front of the case, the first fan may be provided at the rear of the operation unit assembly 6, and an opening may be provided at the rear of the operation unit assembly. This is a structure that enables the manipulation of the manipulation unit assembly 6 to be conveniently located and to place the manipulation unit assembly in a relatively free space. In addition, this structure is a structure capable of smoothly cooling both the operation unit assembly and the second cooking heating unit 9 in the second space with the first fan, and relatively cools the second cooking heating unit 9 and the operation unit assembly. It is possible to minimize the effect of heat from the second cooking heating unit on the control unit assembly by disposing it far away. In addition, since the air discharged from the first fan can cool the operation unit assembly and the second cooking heating unit separately, it is possible to efficiently cool the cooled parts 6 and 94 having different characteristics with one fan. Do.

The operation unit assembly 6 supports a substrate holder 61 to which the first substrate 60 facing the bottom surface of the upper plate portion is fixed, and the front portion and both side surfaces of the substrate holder 61 from below, and the substrate A holder support bracket 62 connected to a lower portion of the holder 61 may be included. This is a form capable of relatively firmly supporting the substrate holder while allowing the rear to be opened.

In particular, when the control unit assembly is an elongated assembly having a left-right direction longer than a front-back direction, if a seating leg 613 extending downward is provided on the rear surface of the substrate holder 61, the substrate holder 61 By preventing the rear surface from sagging downward, the substrate holder can be supported more reliably.

According to the present invention, it is possible to smoothly cool various components to be cooled using a minimal cooling configuration in a narrow space. In particular, it is possible to smoothly cool the display input board installed at the forefront of the cooking appliance, which cannot be cooled smoothly.

In addition, according to the present invention, it is possible to minimize the influence of the operation unit assembly disposed close to the hot heat source from the hot heat source.

In addition, according to the present invention, electrical components, such as a power board or control unit, which always need to be cooled regardless of which type of heating unit is operated in a combined cooking appliance, can be smoothly cooled even with the simplest structure.

In addition to the effects described above, specific effects of the present invention will be described together while explaining specific details for carrying out the present invention.

1 is a perspective view showing a state in which a case and a top plate of a cooking appliance are separated as an embodiment of a home appliance according to the present invention;
2 is a plan view showing a case portion of the cooking appliance of FIG. 1;
3 is a perspective view of a case portion of the cooking appliance of FIG. 2 viewed from the rear;
4 is a perspective view showing a state in which a heating unit is removed from a case portion of the cooking appliance of FIG. 3;
5 is a plan view showing a state in which an intermediate plate and a working coil are omitted in a space in which an induction heating unit of a cooking appliance is installed;
6 is an exploded perspective view of a control unit assembly installed in a cooking appliance viewed from the rear;
7 is a rear perspective view of a state in which the operation unit assembly of FIG. 6 is assembled;
8 is a rear cross-sectional view of the operation unit assembly of FIG. 7;
9 is a rear cross-sectional view showing a state in which the control unit assembly and the top plate are installed in the case of FIG. 8;
10 is a view of the inside of the case and the top plate cut from the side so that the state in which the operation unit assembly is installed between the case and the top plate is cut from the side and viewed from the rear side, and
11 is a side view of a state in which an operation unit assembly is installed by incising a home appliance in a forward and backward direction;

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

The present invention is not limited to the embodiments disclosed below and can be implemented in various different forms, but only the present embodiments make the disclosure of the present invention complete and the scope of the invention completely covered by those skilled in the art. It is provided to inform you.

[Appearance of cooking equipment]

1 is a perspective view showing a state in which a case and a top plate of a cooking appliance according to the present invention are separated. 1 shows a structure in which the display input board of the operation unit is omitted.

As illustrated, the cooking appliance according to the present invention may be largely divided into an upper plate part 2 and a body part 3. The body portion 3 is formed by accommodating a plurality of components for operating the cooking appliance inside a case 50 made of a plate-shaped steel material. The case 50 has a shape in which the upper surface is open by bending the side part 52, the front part 53, and the rear part 54 upward at the four corner ends of the rectangular bottom part 51 constituting the bottom surface. .

The upper plate portion 2 is covered and fixed to the open upper surface of the case 50 . The width of the upper plate portion 2 may be larger than that of the bottom portion 51 . The cooking appliance 1 is provided on the top plate of the sink, and may be placed on an opening that is wider than the bottom portion 51 and smaller than the top plate portion 2 . That is, the bottom surface of the upper plate part 2 protrudes outward more laterally than the bottom part 51 can be installed in the kitchen in a form that rests on the edge of the opening of the upper plate of the sink.

The top plate portion 2 covers the opening of the sink in a state where the cooking appliance 1 is mounted on the top plate of the sink and is exposed to the upper surface to form the upper surface of the cooking appliance 1 .

And, the upper plate portion 2 includes a top plate 20 providing a surface on which a container for cooking and food can be placed.

In addition, at the rear of the top plate 20, a vent member serving as a passage through which the air discharged after cooling the internal components of the body portion 3 or the exhaust gas of the mixture burned in the body portion 3 is discharged ( 30) is provided.

In addition, the upper plate portion 2 includes an upper plate frame 10 that fixes the top plate 20 and the vent member 30 and constitutes an outer edge thereof.

[Composition of the upper plate]

The top plate part 2 includes a top plate frame 10 constituting an outer edge of the entire top plate part, a top plate 20 fastened to the inside of the top plate frame 10, a rear end of the top plate 20 and the top plate frame. It includes a vent member 30 provided between the rear parts of (10).

The upper plate frame 10 is provided in a form in which an upper surface portion 11 and a side portion 12 are bent. Among these, the upper surface portion 11 is provided in a form connected in a rectangular shape as a whole, and the side portion 12 is provided in a downwardly bent form at an outer end of the upper surface portion 11.

The top plate 20 and the vent member 30 are inserted and fixed in the top frame 10. The top plate 20 is installed in front of the top frame 10, and the vent member 30 is the top plate. It is installed at the rear of the frame 10. However, their installation location or relationship is not necessarily limited thereto, and various other modified examples may be applied.

The top plate 20 may be made of ceramic glass and has a rectangular flat plate shape having a thickness. An operation unit display may be provided on the front portion of the top plate 20 to identify the operation part 4 corresponding to the upper surface of the operation unit accommodated in the operation unit accommodating unit 55 of the case. The display of the control unit may be printed on the upper surface of the top plate, attached in the form of a film, or a transparent or translucent portion of the ceramic glass portion to expose the control unit. In addition, although it is not externally displayed before manipulation, when a user touches a nearby area, a backlight is turned on from the bottom of the ceramic glass so that the manipulation unit can be displayed. A lower surface of the display portion of the operation unit of the top plate may be in close contact with an upper surface of the operation unit.

The control unit and the top plate portion in close contact with the control unit are cooled by the air flow of the first fan 96 of the main body part 3, which will be described later, so that the control unit does not become hot when the user touches the control area of the top plate 20. can

In addition, when the top plate 20 is fixed on the case 50, at the position of the top plate 20 corresponding to the burners 901 and 902 and the working coil 82 of the body part 3, which will be described later, A mark indicating that the corresponding position is the position of the heating unit may be provided. In addition, these marks may be displayed to distinguish whether they are a burner heating unit or an inverter heating unit.

Among the top edges of the top plate 20 described above, the front edge and the two side edges are closely fixed to the bottom surface of the top portion 11 of the top plate frame 10, and the left and right and front side edges of the top plate 20 is closely fixed to the inner surfaces of the left and right side and front side side parts 12 of the top plate frame 10 . As a method of fixing them, for example, a method in which a heat-resistant silicone adhesive member is injected between the top plate 20 and the top plate frame 10 to mutually fix them may be used.

A vent member 30 having a long rectangular shape in the left and right directions is installed at the inner rear of the upper plate frame 10 . The vent member 30 may have a shape that slightly protrudes upward from the upper plate portion 2, and on the upper surface of the vent member 30, exhaust holes in the form of track-shaped long holes extending in the front and rear directions may be formed side by side in the left and right directions. . The exhaust hole may be formed by a piercing process. At this time, by working the piercing mold downward from the top so that the burr on the inner circumferential surface of the exhaust hole is downward, it is possible to improve the appearance quality and prevent sharp burrs from being exposed to the outside.

A connection bracket 40 (see FIGS. 10 and 11) corresponding to the side part 52, front part 53, and rear part 54 of the case 50 is fixed to the bottom surface of the top plate part 2. , The top plate may be fixed to the case by fixing the connection bracket to the side, front, and rear portions of the case.

[Configuration of the inside of the main body]

2 is a plan view showing a case portion of the cooking appliance of FIG. 1, FIG. 3 is a rear perspective view of FIG. 2, FIG. 4 is a perspective view showing a state in which a heating unit is removed from the case portion of the cooking appliance of FIG. 3, and FIG. 5 is an induction of the cooking appliance. It is a plan view showing a state in which the middle plate and the working coil are omitted in the space where the heating unit is installed. 2 to 5 show a state in which the display input board of the operation unit is omitted.

1 to 5, a gas combustion heating unit 9 and an induction heating unit 8 are built into the case 50, which functions as a housing of the body unit 3 of the cooking appliance 1. . The space of the case 50 can be divided into a space for the gas combustion heating unit 9 and a space for the induction heating unit 8 by the barrier 7 serving as a partition, and the barrier 7 is Isolate space spatially.

In the embodiment, the gas combustion heating unit 9 located on the left side of the barrier 7 includes a plurality of burners 901 and 902 in which combustion of the supplied mixed gas occurs, and an insulator 94 for fixing and accommodating the burners includes Two burners, that is, the first burner 901 and the second burner 902 are accommodated in the insulator 94 and are modularized. And the modularized insulator 94 is accommodated in the left space of the case 50 divided by the barrier 7 .

The first burner 901 is located on the front left side of the cooking appliance, and the second burner 902 is located on the rear center. However, the number or location of the burners of the cooking appliance according to the present invention is not limited thereto. The location of the burner may be determined according to the structure and arrangement of the exhaust duct 91 extending to the rear of the burner.

Gas is supplied to the first burner 901 and the second burner 902 . The gas is depressurized through the regulator 93 provided at the right rear end of the case and supplied to the cooking appliance. The gas passing through the regulator 93 moves along the pipe and flows into the valve assembly 92 provided at the rear left end of the case.

In the valve assembly 92, whether to supply to the entire burner 901, 902 is controlled. That is, when the valve assembly 92 is closed, the supply of gas into the cooking appliance 1 is blocked. Also, the valve assembly 92 controls whether and how much gas is supplied to the burners 901 and 902 individually. That is, the gas introduced into the valve assembly 92 may be branched and controlled to be independently supplied to the burners 901 and 902 .

The gas supplied from the valve assembly 92 flows into each of the burners 901 and 902 through a nozzle 95 . When gas is injected into each burner through a nozzle, the primary air is mixed with negative pressure generated by the movement of the gas having pressure and is introduced into the burner. And the mixture of air and gas introduced into the burner burns.

As such, the first burner 901 and the second burner 902 independently burn gas, and combustion heat of the gas heats the glowing plates 911 and 912 of the burner. In addition, when the glowing plates 911 and 912 are heated to a high temperature, radiative heat transfer is performed upward.

Exhaust gas burned in the first burner 901 and the second burner 902 flows along each exhaust duct 91 extending to the rear of the insulator 94, and the discharge port opened at the end of the exhaust duct 91 It is discharged upward through 910.

Since the exhaust duct 91 defines a path through which the burnt exhaust gas is discharged, it can rise to a considerably high temperature by continuously contacting the high-temperature combustion exhaust gas. In this way, in order to prevent the heat generated by the combustion of gas from excessively increasing the temperature of components other than the glowing plate, air for cooling it is supplied to the space on the side of the gas combustion heating unit 9 partitioned by the barrier 7. There is a need. Accordingly, in the embodiment of the present invention, the first fan 96 in the form of a box fan may be installed on the bottom part 51 of the case 50 . The first fan is a configuration for cooling the gas combustion heating unit 9 that generates the most heat, and a larger fan than the second fan 97 or the third fan 85 to be described later may be used. The box fan has the simplest structure, but the intake efficiency is good because the amount of air that can be inhaled is large compared to the volume it occupies.

The first fan is provided in the installation space of the gas combustion heating unit 9 partitioned by the barrier 7 and is located slightly forward from the center of the case. In addition, the first fan is disposed right behind the operation unit to be described later.

The first fan 96 supplies relatively low-temperature air from the outer lower space of the case 50 toward the installation space of the gas combustion heating unit 9 in the case 50. The first fan is a box fan, sucking air from the bottom and discharging it to the top. The air discharged to the top is evenly distributed and flows in all directions.

A part of the supplied air is supplied as primary air for making gas and mixture at the nozzle side described above. Most of the remaining air comes into contact with the outer surface of the insulator 94 and the exhaust duct 91 extending rearward to cool the insulator and the exhaust duct, and is discharged upward through the outlet 910 provided at the rear of the case.

In addition, a part of the remaining air among the air supplied through the first fan 96 comes into contact with the control unit accommodated in the control unit accommodating part 55 and cools it. The air that has cooled the control unit moves toward the vent member 30 provided at the rear of the case and is discharged upward to the outside of the case.

Both the induction heating unit 8 and the gas combustion heating unit 9, which have different heating methods, have different electrical components and components required for heating heat sources, and they are all disposed within the case. Therefore, the inner space of the case is inevitably very narrow, and there is not much space to install the control unit. Therefore, in the present invention, it is considered to install an elongated control unit formed with a narrow width in the front-back direction and a long length in the left-right direction at the front of the case.

However, even if the elongated operation unit is applied, it is unavoidable that it is disposed adjacent to the gas combustion heating unit because there is no space in the case. In addition, since the elongated control unit is long on the left and right, when it is installed in the central part in the left and right width direction of the combined cooking appliance having different heat sources, a part in the longitudinal direction is adjacent to the gas combustion heating unit, The remaining part is adjacent to the induction heating part (8).

It is very meaningful that the first fan 96 cools the control unit. That is, the first fan 96 cools the gas combustion heating unit 9 by operating together with the gas combustion heating unit 9 having the highest amount of heat generated. Here, the first fan 96 is located between the insulator 94 and the operation unit and is adjacent to the insulator 94 and the operation unit, so when the gas combustion heating unit 9 is operated, the first fan 96 The discharged air not only cools the insulator 94, but also cools the control unit that can be thermally affected by the gas combustion heating unit 9. Conversely, when the gas combustion heating unit 9 does not operate, the first fan 96 may not operate. When the gas combustion heating unit 9 does not operate, the operation unit is operated by the gas combustion heating unit. Since there is no possibility of being thermally affected, it is okay even if the first fan does not operate.

A holder support bracket 62 is fixed to the bottom part 51 of the case via an elastic body 70 in the operation unit accommodating part 55 provided in the left and right rectangular shape at the front of the case. The elastic body 70 is provided at both ends in the longitudinal direction to stably support the long and thin holder support bracket 62 .

A substrate holder 61 is fixed to the upper portion of the holder support bracket 62, and a display input substrate 60 (not shown in FIGS. 1 to 3) is installed on the upper portion of the substrate holder 61. In addition, as an upper surface of the holder support bracket 62, an operating substrate 601 for controlling the display contents of the display input substrate and controlling each heating unit 8, 9 according to an input command is placed on the lower portion of the substrate holder 61. is installed

The display input board of the control unit is a component manipulated by the user to adjust the heating power of the cooking appliance, and can be manipulated by the user's touch operation. However, as the manipulation method, various other methods may be applied in addition to the touch.

Meanwhile, a second fan 97 for separately cooling the valve assembly 92 is installed at the rear left side of the case. The second fan 97 may also be a box fan. The air introduced from the lower part of the outer space of the case by the second fan 97 moves to the rear of the case and is discharged to the outside through the vent member 30 . The valve assembly 92 is provided with a valve for controlling distribution and supply of gas, and an internal configuration for controlling this may be sensitive to heat.

In view of this point, in the embodiment of the present invention, a separate second fan 97 for cooling the valve assembly 92 is installed, and the valve assembly 92 is cooled separately from the insulator 94 through this structure. exemplify Accordingly, air is discharged to the outside through the vent member 30 without a separate duct structure at the rear portion of the case 50 where the valve assembly 92 is provided.

If the valve assembly 92 is in a separate space, the second fan 97 smaller than the first fan 96 may be sufficient to cool the valve assembly 92 . By the way, the valve assembly 92 and the insulator 94 with a built-in heating device of the combustion heating method are disposed together in the left space separated by the barrier 7. Therefore, it cannot be ruled out that the heat generated in the combustion heating device is transferred to the valve assembly 92. Accordingly, in the present invention, a second barrier 7-1 may be further installed between the valve assembly 92 and the insulator 94. When the second barrier is installed, the space in which the valve assembly 92 is installed may be separated from the insulator installation space. Accordingly, it is possible to independently cool the valve assembly 92 with the second fan 97 by preventing heat generated from the heating device of the combustion heating method from being transferred to the space where the second barrier is installed through convection or radiation. there is.

Meanwhile, an induction heating unit 8 is provided in the right space partitioned by the barrier 7 in the case. The induction heating unit 8 is installed on the working coil 82 installed on the middle plate 81 provided in front of the right space and the bottom part 51 of the case 50, but the middle plate 81 ) The control board PCB 87 provided in the space of the accommodating part 57 provided at the bottom of the case, and the power board provided on the bottom part 51 of the accommodating part 56 provided in the rear part of the space on the right side of the case. A noise filter PCB 88 is included.

In addition, the induction heating unit 8 further includes a display unit 83 installed on the intermediate plate 81 in front of the working coil 82 to irradiate visible light upward. The display unit 83 is for visually displaying that the working coil is operating when the working coil 82 is operating.

The noise filter PCB 88 is a power supply board, and functions to remove noise from power to be supplied to the working coil, and the valve assembly 92, the control board 87, and the display input board 60 and operation It functions to supply power to the substrate 601. The control PCB 87 controls the operation of the working coil. An IGBT (872), which is a kind of high-heating chip that controls the working coil, is mounted on the control PCB. This chip is a chip that requires temperature management and cannot control the working coil if it is overheated to a predetermined temperature.

In view of this, a third fan 85 is installed on the front right side of the case 50 . The third fan 85 may be a sirocco fan that sucks in air from the lower part of the outer space of the case 50 and discharges it to the rear.

The air introduced into the right space of the barrier 7 through the sirocco fan first contacts and cools the IGBT chip 872 and the heat sink 871 attached to cool it, and some of them cool the middle plate 81 ), cooling the working coil 82 installed in the housing 56, and cooling the noise filter PCB 88 installed in the housing 56, reaching the rear end of the case and being discharged upward.

It is preferable that the third fan 85 intensively cools the heat sink 871 by discharging air to the rear. In addition, since the induction heating unit itself does not have a higher calorific value than the gas combustion method, it does not have a large thermal effect on the operation unit. Therefore, it is more advantageous in terms of cooling efficiency to focus on cooling the IGBT 872, which desperately needs temperature management, rather than allowing the air discharged from the third fan 85 to reach the control unit. In addition, when the third fan 85 generates a strong air flow backward, the air in front of the third fan also flows backward under the influence of the air flow. Therefore, there is no concern that the hot air that cooled the IGBT flows backward.

The barriers 7 and 7-1 apply different heating methods or function to separate spaces requiring cooling independently from each other. This barrier is in the form of a plate material extending upward from the bottom part 51 of the case 50, and can be fixed to the side part 52, the rear part 54, etc. as necessary to maintain rigidity.

[Structure of operation unit assembly]

Hereinafter, an embodiment of an operation unit assembly applied to the cooking appliance of the present invention will be described in detail.

6 is an exploded perspective view of a control unit assembly installed in a cooking appliance as viewed from the rear; FIG. 7 is a rear perspective view of an assembled control unit assembly of FIG. 6; Figure 8 is a rear cross-sectional view showing a state in which the control unit assembly and the top plate are installed in the case, and FIG. A view viewed from the rear side, and FIG. 11 is a view viewed from the side of a state in which the operation unit assembly is installed by cutting the home appliance in the front and rear directions.

On the upper surface of the display input substrate 60 closely adhered to the bottom surface of the top plate 20 of the present invention, a sensing unit for detecting a user's touch operation and a display unit for displaying the operating state of the cooking appliance to the user are provided. The sensing unit and the display unit may be implemented in a form mounted on a PCB.

Considering the fact that there is insufficient space for installation internally, the display input board 60 is substantially formed in the form of a rectangle that is elongated left and right. And, this display input board is provided on the inside front of the body part 3 and adheres to the lower surface of the front part of the top plate. Also, the display and input sensing of the display input board are controlled by the operation board 601.

The display input board 60 and the operating board 601 are fixed by holders 61 and 62. The holders 61 and 62 are detachably installed at the bottom of the substrate holder 61 and the substrate holder 61 that fixes the display input substrate 60 and evenly supports the lower surface of the display input substrate, and operates the substrate ( 601) and includes a holder support bracket 62 elastically supported by the elastic body 70. The display input board 60 is fixed to the upper holder 61 since it must be in close contact with the lower surface of the upper plate, whereas the operating board 601 is fixed to the lower holder 62 for compact arrangement.

The substrate holder 61 has an upper structure supporting at least an edge portion of the display input substrate 60 . The upper structure includes a shape supporting a bottom edge of the display input board and a side surface of the display input board. And the substrate holder 61 has a lower structure extending downward from the upper structure. The lower structure may have a shape in which a member supporting a side surface of the display input substrate of the upper structure extends downward. The lower end of the lower structure is supported by the upper part of the holder support bracket 62 detachably fixed to the lower part of the substrate holder 61.

Looking at their detachable structure, first, at the lower end of the substrate holder 61, a plurality of first fastening members 611 in the form of hooks extending downward are provided at predetermined intervals along the circumference of the lower end of the substrate holder. In the illustrated embodiment, a first fastening member 611 is provided on the inner surface of the lower end of the substrate holder located at the front, and a first fastening member 611 is provided on the outer surface of the lower end of the substrate holder located on the side.

Correspondingly, a second fastening member 621 in the form of a hole is provided near the upper end of the holder support bracket 62 to prevent the first fastening member 611 from being caught in a hook shape after being inserted thereinto. Similar to the installation position of the first fastening member 611, the second fastening member is provided on the inner surface of the front upper end of the holder support bracket 62 and the outer surface of the lateral upper end of the holder support bracket 62.

In addition, to increase the supporting force of the substrate holder 61, a support 622 is provided at an upper end of the holder support bracket 62 to further expand an area for supporting the lower surface of the substrate holder 61. The support is formed in the form of extending inwardly from the upper end of the holder support bracket 62 . In addition, if necessary, a seating groove 612 in the form of surrounding the top and side surfaces of the support 622 is further provided inside the substrate holder 61 so that the substrate holder 61 is attached to the holder support bracket 62. It can be supported more firmly by

By the configuration of the above-described fastening members 611 and 621, the support 622, and the seating groove 612, the substrate holder 61 can be attached to and detached from the holder support bracket 62 and securely fixed without flow. .

A board fixing part 625 to which an operating board 601 can be installed is provided below the holder support bracket 62 . The operation board 601 fixed to the board fixing part 625 controls the display items of the display input board 60, receives user input information input through the display input board 60, and Based on the operation information, the operation of the induction heating unit 8 and the gas combustion heating unit 9 is controlled.

Both the substrate holder 61 and the holder support bracket 62 have a long rectangular shape, and a first substrate 60 and a second substrate 601 are respectively installed. In addition, these (61, 62) are fixed to each other with the edge portion corresponding to the front and both sides of the rectangle. The back surface of the substrate holder 61 and the holder support bracket 62 are not fastened to each other, and have an opening provided between the substrate holder 61 and the substrate fixing part 625 .

Elastic body coupling parts 623 are provided on both sides of the holder support bracket 62 . The elastic coupling part 623 is formed on both sides of the holder support bracket 62 . According to the cooking appliance of the present invention, space is insufficient because the heating unit is installed behind the control unit accommodating part 55 in the case, and space is also insufficient in the front because the display input board is formed in a rectangular shape that is long to the left and right. In addition, since the display input board is a rectangular shape that is long to the left and right, elastic deformation is smoothly performed in one direction (up and down direction) like a leaf spring on the left and right sides of the display input board, and considerable robustness is maintained in the other direction (left and right directions). When an elastic body is installed, a simple elastic support structure can be implemented while elastic movement is possible in the vertical direction and the movement is small in the front and rear and left and right directions.

In addition, the substrate 60 and the substrate holder 61 are provided a little shorter than the length of the holder support bracket 62, so that the elastic body coupling part 623 is more outward than both ends of the substrate 60 and the substrate holder 61. If formed so as to protrude, the elastic body can be easily fastened to the holder support bracket 62 even when the display input substrate 60 and the substrate holder 61 are installed on the holder support bracket 62.

The elastic fastening part has a side surface and a bottom surface in contact with the elastic body 70, and a hole for fastening a screw is provided on the bottom surface to fix the elastic body 70 with a screw. In addition, accommodating guides 624 supporting the widthwise side surfaces of the elastic body 70 and accommodating the elastic body 70 are provided on the front and rear sides of the bottom surface in a downwardly extending form, so that the operation unit can move forward and backward with respect to the elastic body. It can be prevented to some extent from swinging in the direction.

According to the present invention, since the substrate holder 61 and the holder support bracket 62 are manufactured in a separate form, it is easy to install the first substrate and the second substrate, respectively. In addition, this is advantageous in terms of manufacturing convenience as it can simplify the take-out or mold configuration during injection molding. In addition, since the substrate holder 61 on which the first substrate 60 is installed and the holder support bracket 62 on which the second substrate 601 is installed can be separated and coupled, the first substrate 60 and the holder support bracket 62 are fixed. The substrate holder 61, the second substrate 601, and the holder support bracket 62 to which it is fixed are each of different types (washing machines, dishwashers, etc.) or devices of different standards (small cooking appliances, large cooking appliances, etc.) It can also be modularized for use. For example, as long as the standards of the substrates 60 and 601 are the same, even if different substrates are used, the substrate holder 61, the holder support bracket 62, and the elastic body 70 can be used in common.

Meanwhile, at the rear of the substrate holder 61, a seating leg 613 extending downward from a substantially central portion is provided. The seating leg 613, together with the control unit seat 551 installed in the case 50, accurately regulates the installation position of the control unit assembly with respect to the case 50, and is a control unit capable of moving up and down by an elastic body. Upward flow of the assembly may be guided, and a lower limit at which the control unit assembly may descend may be regulated. This seating leg 613, together with the control unit seating table 551, has a supporting force for the rear of the substrate holder 61 with respect to the rear structure of the substrate holder 61 and the holder support bracket 62, which are not fixed to each other. reinforces

Looking at the assembly structure of the control unit assembly, first, the lower end of the elastic body 70 of the control unit assembly is fixed to the bottom part 51 of the case 50, and then the upper plate is fixed to the upper part of the case to form the control unit assembly on the bottom of the upper plate. In a state where is pressed so that the elastic body is pressed, the connection bracket 40 installed on the bottom surface of the upper plate part 2 is fixed to the sidewall of the case 50 (see FIGS. 10 and 11). Then, even if the top plate is slightly deformed due to food being placed on the top plate, the display input substrate 60 is pressed upward by the elasticity of the elastic body 70 and continuously adheres to the bottom surface of the top plate.

When the control unit assembly is pushed down by the upper plate and moved, the seat leg 613 is seated on the control unit seat 551, and the movement is guided in the vertical direction. In addition, since the control unit assembly is still aligned while the movement is guided, even if the top plate moves up and down, the control unit assembly moves up and down together at the aligned position.

Even when the cooking appliance is assembled, as shown in FIGS. 9 and 11 , since there is a certain gap between the lower end of the control unit assembly and the bottom of the case 51, even if the top plate receives a load or an impact, the elastic body By absorbing it, it is possible to mitigate impact applied to the display input substrate.

[Operation unit assembly and cooling structure]

As described above, the operation unit assembly has a rear open structure, and accordingly, a space between the substrate holder 61 and the substrate fixing part 625 of the operation unit assembly is open to the rear. A portion of the open space of the control unit assembly is adjacent to the first fan 96 and is open toward the gas combustion heating unit 9, and the remaining portion is open toward the induction heating unit 8. That is, the control unit assembly is disposed across the inner space of the case 50 divided by the barrier 7, and the front surface of the control unit assembly is in close contact with the front part 53 of the case, and the front side of the barrier 7 The end is adjacent to the rear surface of the operation unit assembly. Therefore, the barrier 7 is not installed in the area occupied by the control unit assembly, but the space of the gas combustion heating part 9 and the space of the induction heating part 8 are separated by the barrier 7 in the inner space of the control unit. will communicate

When the first fan 96 operates, a portion of air is introduced into the internal space of the control unit assembly that is open toward the gas combustion heating unit 9, and the introduced air is distributed to the left and right along the longitudinal direction of the control unit assembly. become and flow In addition, the air flowing to one side of the distributed flow returns to the gas combustion heating unit 9 again, and the air flowing to the other side is separated from the gas combustion heating unit 9 by the barrier 7 and the induction heating unit ( After passing through the boundary of 8), it comes out toward the induction heating part (8).

The air returned to the gas combustion heating unit 9 moves to the rear of the case 50, comes into contact with the outer surface of the insulator 94, or is supplied as primary or secondary air of the burners 901 and 902. Then, after cooling the insulator 94 or burning together with the fuel, it moves to the rear of the case and is discharged upward.

And the air coming out toward the induction heating unit 8 moves backward and comes into contact with the noise filter PCB that controls the power and is discharged upward from the rear of the case 50 .

Hereinafter, a cooling operation of the combined cooking appliance according to the present invention will be described.

First, looking at the case of using only the induction heating unit 8, when the induction heating unit 8 operates, the third fan 85 operates, heat is generated in the high heating chip that controls the working coil 82, and the upper plate Heat is transferred from the food heated while placed on the table to the working coil 82 inside the case. The third fan 85 sucks air from the outside of the case, that is, from the bottom, and discharges it to the rear. The air discharged to the rear contacts the high-heating chip 872 and the heat sink 871, cools them, and then discharges the air to the rear.

In addition, some of the air discharged to the rear moves to the upper space of the middle plate through a ventilation hole (not shown) provided in the middle plate 81 and then moves to the rear. The air that has moved to the upper part of the middle plate cools the heat transferred from the food, moves backward, and is discharged to the outside of the case.

When only the induction heating unit 8 operates, air from the third fan 85 is intensively discharged to the rear, so the flow rate at the rear of the third fan increases and the pressure decreases accordingly. Accordingly, the air located in front of the third fan has a relatively high pressure, and an air current that moves backward in the air located in front of the third fan in the case is generated. Therefore, the air in the inner space of the control unit assembly is also reduced, and accordingly, the air is introduced through the first fan 96 side of the gas combustion heating unit 9 or other parts of the case communicating with the outside, again to the inside of the control unit assembly. will fill the space.

That is, even if only the third fan 85 is operated, air flows in the space toward the gas combustion heating unit 9 and moves toward the induction heating unit 8 through the internal space of the control unit assembly. Therefore, even if some of the heat of the food is transferred to the control unit assembly, there is no problem in cooling it.

Next, when only the gas combustion heating unit 9 operates, the first fan 96 and the second fan 97 operate. The second fan 97 introduces air from the lower space of the case into the space separated by the barrier 7-1. The air introduced by the second fan 97 moves backward, cools the valve assembly 92, and then is discharged to the outside of the case.

A portion of the air supplied to the inside of the case by the first fan 96 is supplied toward the burner 901 and/or 902 where ignition has occurred and is used for combustion with gas, and the burned gas passes through the exhaust duct 91 to the rear. After moving to , it is discharged through the discharge port 910 . In addition, another part of the air supplied to the inside of the case by the first fan 96 contacts the outer surface of the insulator 94, cools the insulator 94, moves backward, and is discharged to the outside through the outlet 910. As described above, the first fan 96 is located between the insulator 94 and the operation unit and is adjacent to the insulator 94 and the operation unit, so air already supplied from the first fan to the insulator (burner) as described above. It is apparent that, as shown in FIG. 4, it does not move towards the operation unit and moves backward and is discharged to the outside.

Also, another part of the air supplied to the inside of the case by the first fan 96 is introduced into the inside of the operation unit assembly through an open part at the rear of the operation unit assembly, and the introduced air is distributed left and right and flows. . The air moved to one side cools the control unit assembly and moves toward the gas combustion heating unit 9 again to cool the insulator or is supplied to gas combustion to be combusted and then discharged to the rear. The air moved to the other side cools the control unit assembly and crosses the inner space of the case partitioned by the barrier 7 and flows into the space where the induction heating unit 8 is installed. Then, it flows to the rear of the case, cools the power board 88, and then is discharged from the rear end of the case to the outside of the case.

As such, even if the third fan 85 does not operate because the induction heating unit 8 does not operate, the air introduced into the case through the first fan 96 partially flows toward the induction heating unit 8 and the power board 88 ) to cool. The power board 88 generates heat even when only the gas combustion heating unit 9 operates, and the installation position of the power board 88 is a space on the side of the induction heating unit 8. Therefore, if the gas combustion heating unit 9 and the induction heating unit 8 are partitioned up to the case front part 53 by the barrier 7, even if only the gas combustion heating unit 9 operates, the induction heating unit 8 side The third fan 85 must be operated to cool the power board 88.

By the way, according to the cooling structure of the present invention, the inner space of the operation unit assembly becomes a passage connecting the space of the gas combustion heating unit 9 and the induction heating unit 8. And, the first fan 96 is located just behind the open rear surface of the control unit assembly. Therefore, when only the gas combustion heating unit 9 operates, only the operation of the first fan 96 for cooling the gas combustion heating unit 9, some air passes through the control unit assembly and flows into the induction heating unit 8 and cools the power board 88 and is discharged to the rear. That is, cooling of the power board 88 is possible even when the third fan 85 is not operating.

On the other hand, when both the gas combustion heating unit 9 and the induction heating unit 8 operate, the first to third fans all operate, and the air flow and cooling principle accordingly are the two cases described above, that is, the induction Since it can be understood that both the cooling principle of the case where only the heating unit 8 operates and the case where only the gas combustion heating unit 9 operates is applied, redundant description thereof will be omitted.

As described above, the present invention has been described with reference to the drawings illustrated, but the present invention is not limited by the embodiments and drawings disclosed in this specification, and various modifications are made by those skilled in the art within the scope of the technical idea of the present invention. It is obvious that variations can be made. In addition, although the operational effects according to the configuration of the present invention have not been explicitly described and described while describing the embodiments of the present invention, it is natural that the effects predictable by the corresponding configuration should also be recognized.

1: Cooking appliance
2: upper plate
3: main body
4: manipulation site
6: control unit assembly
7, 7-1: Barrier
8: induction heating unit
9: gas combustion heating unit
10: Top frame
20: Top plate (ceramic glass)
30: vent member
40: connection bracket
50: case
55: operation unit accommodating part
551: control unit seat
56: noise filter PCB receiving part
57: control PCB receiving part
60: display input board (first board)
601: operating board (second board)
61: board holder
611: first fastening member (hook)
612: seating groove
613: seating leg
62: holder support bracket
621: second fastening member (hole)
622: support
623: elastic body coupling part
624: acceptance guide
625: board fixing part
70: elastic body
81 middle plate
82: working coil
83: display unit
85: 3rd fan
87: control board (PCB)
871: heat sink
872: high heating chip (control chip)
88: power supply board (noise filter PCB)
881: noise filter
901, 902: first burner, second burner
911, 912: red heat plate
91: exhaust duct
910: discharge port
92: valve assembly
93: regulator
94: insulator
95: nozzle
96: 1st fan
97: Second fan

Claims (19)

a case with an open top and a predetermined space;
an upper plate coupled to the upper portion of the case to shield the open upper portion of the space and having a surface on which food is seated;
a first cooking heating unit accommodated in a first space provided inside the case and heating food seated on the upper plate;
a second cooking heating unit accommodated in a second space adjacent to the first space inside the case and heating food seated on the upper plate;
an operation unit assembly disposed across the first space and the second space; and
A first fan adjacent to the control unit assembly and installed in the second space,
An opening is provided in a portion of the control unit assembly facing the first fan, so that a part of the air introduced into the second space inside the case by the first fan flows into the first space through the control unit assembly. A combined cooking appliance.
The method of claim 1,
The second cooking heating unit includes a different type of heat source than the first cooking heating unit.
The method of claim 2,
The first cooking heating unit uses an induction heating type heat source, and the second cooking heating unit uses a gas combustion type heat source.
The method of claim 2,
The first space and the second space are spatially partitioned by a barrier.
The method of claim 1,
The first fan is a box fan combined cooking appliance.
The method of claim 1,
The control unit assembly is an elongated assembly having a longer left-right direction than a front-back direction width, and disposed in front of the case.
The method of claim 6,
An elastic body for elastically biasing the operation unit assembly upward is provided at the center of both sides of the operation unit assembly.
The method of claim 5,
The first fan is disposed between the second cooking heating unit and the control unit assembly.
The method of claim 1,
An inner space of the control unit assembly communicating with the opening communicates with the first space.
The method of claim 1,
A third fan is provided in the first space and installed adjacent to a space in which the first space and the second space communicate,
An air discharge direction of the third fan is a direction away from the space unit.
The method of claim 10,
The third fan is a sirocco fan.
The method of claim 1,
The operation unit assembly,
a substrate holder to which a first substrate facing the bottom surface of the upper plate unit is fixed;
A combined cooking appliance comprising a holder support bracket installed under the substrate holder and having a substrate fixing portion disposed spaced apart from the substrate holder.
The method of claim 12,
A composite cooking appliance in which a second substrate is installed on the substrate fixing part.
The method of claim 1,
A component to be cooled that operates when at least one of the first cooking heating unit and the second cooking heating unit is in operation is installed in the first space.
The method of claim 1,
A part of the air introduced into the case by the first fan flows in the second space, cools the second cooking heating unit, and is discharged to the outside of the case.
The method of claim 1,
An internal space of the control unit assembly communicates with the first space and the second space.
The method of claim 16
The operation unit assembly is provided in front of the case,
The first fan is provided at the rear of the control unit assembly,
The opening is provided at the rear of the control unit assembly.
The method of claim 11,
A combined cooking appliance comprising a high heating chip for controlling the first cooking heating unit disposed on a discharge side of the third fan.
The method of claim 10,
The first fan operates when the second cooking heating unit operates,
The third fan operates when the first cooking heating unit operates.

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