JP2014116268A - Induction heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an induction heating cooker which can efficiently cool heat generating components such as a heating coil and a circuit board, and which can effectively utilize a space inside a housing.SOLUTION: An induction heating cooker comprises: a cooling fan 43 for sending air sucked from a front suction port 15; an air duct unit including a substrate holding pedestal 41 for holding the cooling fan 43 and an inverter circuit substrate 20, and a substrate cover 42 for covering an upside of the inverter circuit substrate 20; and a duct formation member 50 attached and removed from a housing 1 independently from the air duct unit, for separating a suction side of the cooling fan 43 from an exhaust port 17 above the suction side of the cooling fan 43. The housing 1 includes: a front wall lower part 112 which projects forward with respect to a front wall upper part 111; and an overhang wall 113 for connecting a bottom edge of the front wall upper part 111 and a top edge of the front wall lower part 112. An anterior part of the air duct unit is arranged in a space under the hangover wall 113 in the housing 1. The air duct unit is positioned in a lengthwise direction by an inner surface of the front wall lower part 112 and an inner surface of a rear wall 12.

Description

  The present invention relates to an induction heating cooker that induction-heats an object to be heated with a heating coil.

  Conventionally, a technique for cooling a heat generating component such as a heating coil or a circuit component provided in an induction heating cooker has been proposed. As such, an air inlet and an air outlet are provided in the top plate, the inverter board and the induction heating coil are cooled by the cooling air sucked from the air inlet, and the cooling air after the inverter board and the induction heating coil are cooled. An induction heating cooker that exhausts the gas from the exhaust port has been proposed (see, for example, Patent Document 1).

  In addition, as another induction heating cooker, “air is taken in from the outside of the housing to the bottom surface, rear surface or side surface near the rear corner of either the left or right side of the housing covered with the top plate. A technique is proposed in which at least one intake port is provided and an exhaust port is provided at the rear of the top plate opposite to the intake port, so that air taken in from the intake port is discharged from the exhaust port. For example, see Patent Document 2).

JP 2011-3368 A (page 7, page 8, FIG. 1, FIG. 3) JP 2012-22919 A (page 4, FIG. 1)

  In the induction heating cooker described in Patent Document 1, since the intake port is provided in the top plate that forms the upper surface of the outer shell of the induction heating cooker, steam, oily smoke, etc. generated during cooking are discharged from the intake port into the outer shell. There is a possibility that a circuit board or the like that is sucked into the casing and contained in the outer shell will break down due to the influence of steam, oily smoke, or the like. In addition, the induction heating cooker described in Patent Document 1 is a built-in type housed in a drop hole formed in the kitchen, and the staircase so that the lower part of the front wall of the housing projects to the near side from the upper part. Although there is a space in the housing on the front side of the opening on the top surface of the housing, this space does not contain parts such as a substrate case, and is a dead space. The space inside the body was not used effectively.

  In the induction heating cooker described in Patent Document 2, the intake port is provided on the bottom surface, the rear surface, or the side surface of the casing, and the exhaust port is provided so as not to overlap with the suction port of the sirocco fan. Steam or oily smoke generated in the air is less likely to be sucked into the housing from the air inlet. However, because there is a restriction that the exhaust port must be arranged avoiding the suction port of the sirocco fan, the exhaust port is provided at a position close to the left and right sides of the top plate. As in the induction heating cooker described in Document 1, it is only possible to ensure an area equivalent to the exhaust port when the exhaust port and the intake port are provided on the upper surface of the top plate. Therefore, the induction heating cooker described in Patent Document 2 cannot be expected to improve the cooling efficiency as compared with the induction heating cooker in which the exhaust port and the intake port are provided on the upper surface of the top plate. An induction heating cooker that can be used has been desired.

  The present invention has been made against the background of the above problems, and provides an induction heating cooker capable of efficiently cooling a heating coil and an inverter board. Moreover, the induction heating cooking appliance which can utilize the space in a housing | casing effectively is provided.

  An induction heating cooker according to the present invention includes a casing having an opening formed on an upper surface and a front intake port formed on a front wall, and is placed on the opening of the casing and has an exhaust outlet at a rear portion. A heating plate for inductively heating an object to be heated placed on the top plate, and an inverter circuit board for driving the heating coil. A built-in induction heating cooker housed in a drop hole formed in the kitchen, which holds the cooling fan that sends out the air sucked from the front intake port as cooling air, the cooling fan, and the inverter circuit board A substrate holding table, a substrate cover mounted on the substrate holding table so as to cover the inverter circuit board, and an air path unit for sending the cooling air to the heating coil; and the air path unit And a duct forming member that is attached to and detached from the housing separately from the exhaust port and divides up and down between the exhaust port and the suction side of the cooling fan. The lower end of the upper front wall and the upper end of the lower front wall are connected by an overhanging wall, and the front portion of the air channel unit is a space below the overhanging wall in the housing The air passage unit is positioned in the front-rear direction on the inner surface of the lower portion of the front wall and the inner surface of the rear wall.

  According to the present invention, the front portion of the air path unit that sends the cooling air to the heating coil is disposed in the space below the overhanging wall in the housing. For this reason, the space in a housing | casing can be utilized effectively. In addition, since the air channel unit is positioned in the front-rear direction on the inner surface of the lower front wall and the inner surface of the rear wall, the air channel unit and the housing are fixed as separate parts when the air channel unit is installed in the housing. Therefore, the number of parts can be reduced, and the induction cooking device can be reduced in weight. In addition, since it has a duct forming member that partitions the space between the exhaust port and the suction side of the cooling fan, it is difficult for steam, oily smoke, etc. entering the housing from the exhaust port to enter the cooling air. Failure due to being sent to the components in the housing can be suppressed. In addition, since the duct forming member is provided so that steam, oily smoke, etc. are not easily mixed in the cooling air, the area of the exhaust port can be expanded in the width direction of the top plate portion, for example, so that the pressure loss is reduced. The amount of cooling air can be increased and the cooling efficiency can be increased. Moreover, since pressure loss can be reduced, the number of rotations of the cooling fan can be reduced, and noise of the cooling fan can be reduced.

It is an external appearance perspective view of the induction heating cooking appliance 100 which concerns on embodiment. It is a figure explaining the installation aspect to the kitchen cabinet 200 of the induction heating cooking appliance 100 which concerns on embodiment. It is a schematic sectional drawing of the induction heating cooking appliance 100 which concerns on embodiment, and is a figure which shows the cross section which follows the ZZ line | wire of FIG. It is a schematic sectional drawing of the induction heating cooking appliance 100 which concerns on embodiment, and is a figure which shows the cross section which follows the YY line of FIG. It is a perspective view of the air path unit 40 which concerns on embodiment. It is a disassembled perspective view of the components accompanying the air path unit 40 and the air path unit 40 which concern on embodiment. It is a figure explaining the dimensional relationship of the housing | casing 1 and the air path unit 40 of the induction heating cooking appliance 100 which concerns on embodiment. It is a figure explaining the assembly | attachment operation | movement to the housing | casing 1 of the air path unit 40 which concerns on embodiment. It is a figure explaining the screwing position of the board | substrate holding stand 41 and the board | substrate cover 42 of the air path unit 40 which concerns on embodiment.

  Hereinafter, embodiments of an induction heating cooker according to the present invention will be described with reference to the drawings. In addition, this invention is not limited by the form of drawing shown below. Moreover, the same code | symbol is attached | subjected to the same structure in each figure.

Embodiment.
[Configuration of induction heating cooker]
FIG. 1 is an external perspective view of induction heating cooker 100 according to the embodiment. An induction heating cooker 100 according to an embodiment is a built-in induction heating cooker that is housed and used in a kitchen cabinet. And a top plate portion 2 that covers the opening on the upper surface of the housing 1 (see the opening 18 in FIG. 7). In the present embodiment, the top plate portion 2 includes, for example, a ceramic plate (top plate) 2a and a metal plate frame 2b surrounding the outer periphery of the plate 2a as main components. The casing 1 and the top plate portion 2 constitute an outer shell of the induction heating cooker 100, and a heated object such as a pan is placed on the top plate portion 2. The induction heating cooker 100 according to the present embodiment is provided with three heating ports 3, and on the top panel 2, a guide position for placing an object to be heated is displayed for each heating port 3 by printing or the like. Has been. On the front side of the top plate 2, the operation unit 4 provided corresponding to each heating port 3 and configured by a push button or a touch panel, the operating state of the induction heating cooker 100, the heating conditions in each heating port 3, etc. There is provided a display unit 5 composed of a liquid crystal screen, a lamp or the like for displaying various information.

  Inside the housing 1 and below the top plate 2 are a grill 6 having heating means such as an electric heater inside and covered with a drawer-type door inside, and an upper side of the grill 6. A heating means (not shown in FIG. 1) for heating an object to be heated placed in the heating port 3 is provided. In the present embodiment, heating coils 7 (not shown in FIG. 1; see FIG. 3) as heating means are provided corresponding to the two left and right heating ports 3 on the front side among the three heating ports 3. A radiant heater (not shown) is provided corresponding to the heating port 3 at the center rear. Radiant heaters heat an object to be heated with radiant heat when AC power of commercial frequency is supplied and the heater itself generates heat. Note that the heating coils 7 may be provided in all the heating ports 3.

  A peripheral wall constituting the periphery of the housing 1 includes a front wall 11 provided on the side facing the user (front side), and a rear wall 12 provided on the rear side facing the front wall 11 (FIG. 3) and left and right side walls 13 that connect the left and right ends of the front wall 11 and the rear wall 12 in the depth direction.

A rear intake port 14 is formed in part of the rear wall 12 and the right side wall 13. The rear air inlet 14 of the present embodiment is configured by a plurality of openings formed in a sheet metal that forms the peripheral wall of the housing 1. The size and shape of the rear air inlet 14 are not limited to those shown in the drawing.
Further, a front air inlet cover 16 is attached to the front lower portion of the housing 1, and a front air inlet 15 (see FIG. 3) is formed on the front wall 11 of the housing 1 covered with the front air inlet cover 16. ) Is formed. The rear air inlet 14 and the front air inlet 15 are air inflow ports from the outside into the housing 1.

  An exhaust port 17 serving as an air outlet from the inside of the housing 1 to the outside is formed at the rear portion of the top plate portion 2, more specifically, at the rear portion of the plate frame 2 b constituting a part of the top plate portion 2. . In the present embodiment, two exhaust ports 17 extending in the width direction of the top plate portion 2 are provided. On the upper side of the exhaust port 17, an exhaust port cover (not shown) made of a highly heat-resistant material such as a sheet metal and having a ventable opening is placed, and the entry of foreign matter into the exhaust port 17 is suppressed. Is done. In the present embodiment, an example is shown in which the top plate part 2 having the plate 2a and the plate frame 2b as main components is provided and the exhaust port 17 is formed in the plate frame 2b. The specific structure and the specific member in which the exhaust port 17 is formed are not limited to this. For example, the exhaust port 17 may be formed in the plate 2 a without providing the plate frame 2 b, and if the exhaust port 17 communicating with the inside of the housing 1 is formed in a member constituting the upper surface of the outer shell of the induction heating cooker 100. Good.

  Drawing 2 is a figure explaining the mode of installation to kitchen cabinet 200 of induction heating cooking appliance 100 concerning an embodiment. 2A shows a state where the induction heating cooker 100 is installed in the kitchen cabinet 200, and FIG. 2B shows a state where the induction heating cooker 100 is being installed in the kitchen cabinet 200. .

  First, the configuration of the kitchen cabinet 200 will be briefly described. The kitchen cabinet 200 is formed with a drop hole 205 which is a space into which the casing 1 of the induction heating cooker 100 is fitted. The drop hole 205 is surrounded by the cabinet top plate 201, the cabinet rear wall 202, the cabinet bottom plate 203, and the cabinet side plate 204 (see FIG. 4). The cabinet top plate portion 201 is formed with a cabinet opening 206 that is smaller than the area of the top plate portion 2 and slightly larger than the area of the upper portion of the housing 1, and enters the drop hole 205 from the cabinet opening portion 206. The housing 1 is fitted. When the depth dimension of the opening 18 on the upper surface of the housing 1 is A, the depth dimension of the cabinet opening 206 is B, and the depth dimension of the top plate 2 is C, the relationship of A <B <C is established. Although not shown, the width dimension of the opening 18 on the upper surface of the housing 1, the width dimension of the cabinet opening 206, and the width dimension of the top panel 2 also have the same relationship as the depth dimension.

  As shown in FIG. 2 (B), when the induction heating cooker 100 is installed in the kitchen cabinet 200, the front portion of the housing 1 is put into the cabinet opening 206 of the kitchen cabinet 200 first, and then the housing. The housing 1 is dropped into the hole 205 while rotating the rear portion of the body 1 in the vertical direction. The lower part of the rear wall 12 of the housing 1 is cornered to avoid hitting the cabinet rear wall 202 of the kitchen cabinet 200 when the rear side of the housing 1 is rotated.

  As shown in FIG. 2 (A), in the state where the induction heating cooker 100 is installed in the kitchen cabinet 200, the peripheral edge of the top panel 2 is above the peripheral edge of the cabinet opening 206 of the cabinet top panel 201. Placed. A gap between the cabinet opening 206 and the induction heating cooker 100 is sealed with a seal member. In the state where the induction heating cooker 100 is incorporated in the kitchen cabinet 200, the inside of the drop hole 205 and the outside of the kitchen cabinet 200 communicate with each other via the air intake opening 207, and the inner surface of the drop hole 205 A gap is formed between the outer surface of the housing 1 and the outer surface of the housing 1 so as to allow ventilation.

  The front wall 11 of the housing 1 is such that the front wall lower portion 112 is located on the front side (the side facing the user; the left side of the drawing in FIG. 2) with respect to the front wall upper portion 111, and the lower end of the front wall upper portion 111. The upper ends of the front wall lower portion 112 are connected by an overhanging wall 113 extending in the depth direction. Since the front wall lower portion 112 projects to the near side, the volume in the housing 1 can be increased as compared with the case where the front wall 11 of the housing 1 is formed of the same planar wall. Moreover, since the handle | steering-wheel handle of the grill part 6 (refer FIG. 1) integrated in the housing | casing 1 can be brought close to a user side, the user can open and close the door of the grill part 6 easily. .

  FIG. 3 is a schematic cross-sectional view of the induction heating cooker 100 according to the embodiment, and is a view showing a cross-section along the line ZZ in FIG. 1. FIG. 4 is a schematic cross-sectional view of the induction heating cooker 100 according to the embodiment, and is a view showing a cross-section along the YY line of FIG. 3. 3 and 4 also show a kitchen cabinet 200 on which the induction heating cooker 100 is installed. In FIG. 3, the air flow generated by the operation of the cooling fan 43 is conceptually indicated by arrows.

  As shown in FIG. 3, a heating coil 7 placed on a coil holding base is disposed inside the housing 1 and below the top plate portion 2. The inverter circuit board 20 placed on the board holding table 41 is disposed below the heating coil 7, and placed on the power board holding board 44 below the inverter circuit board 20. The power supply board 30 is disposed. The upper side of the inverter circuit board 20 is covered with a board cover 42. At a position closer to the rear than the inverter circuit board 20, a cooling fan 43 is installed through a gap between the rear air inlet 14 formed in the housing 1. A duct forming member 50 is provided above the cooling fan 43. As shown in FIG. 4, the grill portion 6 is disposed at a position close to the left inside the housing 1, and the inverter circuit board 20 and its peripheral members are disposed on the other side. Note that the grill portion 6 may be arranged to the right by reversing the left-right positional relationship shown in FIG.

  The inverter circuit board 20 includes a board 21, a switching element 22 that constitutes an inverter circuit that is mounted on the board 21 and supplies high-frequency power to the heating coil 7 (see FIG. 4), and a heat sink 23 attached to the switching element 22. Prepare. The inverter circuit board 20 provided with the switching element 22 generates a larger amount of heat than the power supply board 30.

  The power supply substrate 30 includes a substrate 31 and a power supply circuit component 32 mounted on the substrate 31. A noise filter circuit is also mounted on the substrate 31. The power supply board 30 supplies power to the inverter circuit board 20 and the cooling fan 43. The commercial power supplied from the power supply board 30 to the inverter circuit board 20 is converted into high frequency power by the inverter circuit board 20 and supplied to the heating coil 7. When high-frequency power is supplied to the heating coil 7, a high-frequency magnetic field is generated around the heating coil 7, an eddy current is generated in the heated object placed on the top plate 2, and the heated object itself generates heat. To do. Since the power supply board 30 is installed further below the inverter circuit board 20 disposed on the lower side of the heating coil 7 and is separated from the heating coil 7, the power supply board 30 is emitted from the heating coil 7. It is hard to be affected by the generated noise, and the power supply with noise can be reduced.

  Although not specifically described here, components corresponding to functions required by the induction heating cooker 100 are appropriately mounted on the substrate 21 and the substrate 31.

  In the present embodiment, the cooling fan 43 is configured by an axial fan, and is installed on the substrate holding table 41 so that the rotation axis is substantially horizontal in the front-rear direction. The discharge side of the cooling fan 43 faces the inverter circuit board 20, and the cooling air sent from the cooling fan 43 flows toward the inverter circuit board 20 that is a component to be cooled. In the present embodiment, the inverter circuit board 20 is arranged so that the area where the inverter circuit board 20 is projected on the surface including the discharge cross section of the cooling fan 43 is within the range of the discharge cross section of the cooling fan 43. The cooling air sent from the cooling fan 43 can be blown toward the inverter circuit board 20.

  The lower end of the cooling fan 43 on the discharge side is disposed on the same plane as the lower end of the inverter circuit board 20. By disposing the lower end on the discharge side of the cooling fan 43 and the lower end of the inverter circuit board 20 on the same plane, the cooling air sent from the cooling fan 43 can be supplied to the inverter circuit board 20 without waste. In addition, since a space with less unevenness can be secured below the inverter circuit board 20 and the cooling fan 43, a part of the circuit board (power supply board 30) necessary for the operation of the induction heating cooker 100 as in the present embodiment. Can be installed. For this reason, the space in the housing 1 can be used effectively, and the cooling air flowing in the vicinity of the power supply board 30 is hardly hindered. Further, since the circuit boards necessary for the operation of the induction heating cooker 100 can be divided into a plurality of parts, the density of parts on one board can be reduced, and the ventilation resistance of the parts mounted on each board can be reduced. Can be suppressed. Note that “on the same plane” does not mean that the plane is completely on the same plane, but allows a slight level difference that does not greatly hinder the cooling air sent from the cooling fan 43. It is.

  Further, the upper part of the discharge surface of the cooling fan 43 protrudes above the substrate cover 42, and the cooling air sent from the cooling fan 43 is divided into the lower side and the upper side of the substrate cover 42. In the present embodiment, the area on the discharge side of the cooling fan 43 located below the substrate cover 42 is larger than the area located above the substrate cover 42, and the direction of the cooling air flowing below the substrate cover 42 The air volume is larger than the cooling air flowing upward.

  The duct forming member 50 protrudes in a generally bowl shape from the inner surface of the rear wall 12 of the housing 1 toward the inside of the housing 1, and is one of the space on the suction side of the cooling fan 43, the cooling fan 43, and the substrate cover 42. Cover the upper side of the section. The duct forming member 50 partitions the exhaust port 17 and the suction side of the cooling fan 43 vertically. The rear end portion of the duct forming member 50 is in contact with the upper side of the rear intake port 14 on the inner surface of the rear wall 12 of the housing 1, and is sucked by the cooling fan 43 below the duct forming member 50. A duct through which air and air sent from the cooling fan 43 pass is formed. There is a gap in the height direction between the lower surface of the duct forming member 50 and the upper surface of the substrate cover 42, and the cooling air sent from the cooling fan 43 can pass through this gap. A gap leading to the heating coil 7 is formed in front of the front end portion of the duct forming member 50, and the cooling air coming out of the gap flows toward the heating coil 7.

  On the upper side of the duct forming member 50, a gap that allows ventilation is provided between the upper surface of the top plate 2 and the lower surface of the top plate 2. The upper gap of the duct forming member 50 leads to the exhaust port 17, and the air flowing above the duct forming member 50 flows out of the induction heating cooker 100 from the exhaust port 17.

  The duct forming member 50 is a space on the upstream side of the cooling fan 43 and covers a region overlapping with the exhaust port 17 when viewed from above, and steam, oily smoke, or liquid is introduced into the housing 1 from the exhaust port 17. Even if it flows in, they are less likely to be mixed into the cooling air sent from the cooling fan 43.

  A rib 54 protruding upward is provided on the upper surface of the duct forming member 50. The rib 54 is provided behind the heating coil 7, and even if foreign matter such as liquid or dust flows into the housing 1 from the exhaust port 17, the rib 54 blocks the liquid and dust. Or the like to prevent the foreign matter from reaching the heating circuit 7 or the inverter circuit board 20 in the board cover 42.

An air path configuration through which cooling air for cooling the inside of the induction heating cooker 100 flows will be described with reference to FIG.
As shown in FIG. 3, the air path formed between the rear intake port 14 and the suction side of the cooling fan 43 is referred to as a first intake air path 61. The air path formed between the substrate holding base 41 and the bottom plate of the housing 1 and extending from the front intake port 15 to the suction side of the cooling fan 43 is referred to as a second intake air path 62. The first intake air passage 61 and the second intake air passage 62 communicate with the suction side of the cooling fan 43, and the first intake air passage 61 and the second intake air passage 62 merge at the upstream side of the cooling fan 43. To do.

  An air path communicating with the discharge side of the cooling fan 43 and formed inside the substrate cover 42 is referred to as a first blow-out air path 63. An air path that communicates with the discharge side of the cooling fan 43 and is formed between the upper side of the substrate cover 42 and the duct forming member 50 is referred to as a second blowout air path 64.

[Configuration of air path unit]
In the present embodiment, the substrate holding base 41, the substrate cover 42, and the cooling fan 43 are unitized and accommodated in the housing 1. These unitized ones are referred to as an air passage unit 40. The air path unit 40 and the configuration related thereto will be described with reference to FIGS.
FIG. 5 is a perspective view of the air passage unit 40 according to the embodiment. FIG. 6 is an exploded perspective view of the air path unit 40 and components attached to the air path unit 40 according to the embodiment.

The substrate holding base 41 includes a substantially flat support plate 411 on which the inverter circuit board 20 is placed, an upper peripheral wall 412 that rises upward from the front and left and right peripheral portions of the support plate 411, and left and right sides of the support plate 411. A lower peripheral wall 413 extending downward from the peripheral edge portion is a main component. The upper side of the rear end portion of the support plate 411 is not surrounded by the peripheral wall and communicates with the discharge side of the cooling fan 43.
In addition, in the state where the peripheral wall is not provided on the lower side of the front end portion of the support plate 411 and the holding base lower inlet 414 is formed, and the air path unit 40 is incorporated in the housing 1, The holding base lower inlet 414 communicates with the front air inlet 15. Further, no peripheral wall is provided below the rear end portion of the support plate 411 and communicates with the suction side of the cooling fan 43.
A tunnel-like air passage surrounded by the inner surfaces of the support plate 411 and the lower peripheral wall 413 is formed on the lower side of the support plate 411. In this embodiment, the power supply substrate is held in the tunnel-like air passage. The base 44 and the power supply substrate 30 held by the base 44 are accommodated. In the present embodiment, the power supply substrate 30 and the power supply substrate holding table 44 are attached to the substrate holding table 41 and integrated with the air path unit 40.

  The substrate cover 42 is assembled to the upper part of the substrate holding table 41 and accommodates the inverter circuit substrate 20 between the substrate holding table 41. A cooling air outlet 421 is opened on the upper surface of the substrate cover 42. The cooling air outlet 421 opens at a position near the front of the substrate cover 42 and away from the cooling fan 43, and lengthens the distance through which the cooling air flows from the rear to the front in the substrate cover 42.

  As shown in FIG. 6, the duct forming member 50 includes a duct upper plate 51 that covers the upper side of the cooling fan 43, and a duct side plate 52 that extends downward from the left and right ends of the duct upper plate 51 and covers the left and right sides of the cooling fan 43. Is the main component. A tunnel-like air passage is formed inside the duct upper plate 51 and the duct side plate 52, and the cooling fan 43 is disposed in the air passage.

  A part of the rear side of the duct upper plate 51 is formed with a duct upper plate inclined surface 53 inclined in the front-rear direction and the left-right direction. The duct upper plate inclined surface 53 is located below the exhaust port 17 (position overlapping the exhaust port 17 when viewed from above) when the duct forming member 50 is incorporated in the housing 1. For this reason, even if foreign matter such as spilled liquid, oily smoke, or dust flows into the housing 1 from the exhaust port 17, the foreign matter that has flowed in drops onto the duct upper plate inclined surface 53 and is inclined. And flows to a foreign substance discharge port (not shown). Therefore, foreign matter can be prevented from accumulating on the duct forming member 50 or flowing under the duct forming member 50. In addition, the inclination direction of the duct upper plate inclined surface 53 may be any direction as long as it is directed to the foreign substance discharge port.

  Also, the duct upper plate 51 is provided with ribs 54 protruding upward in the width direction of the duct forming member 50. For this reason, even if a foreign material such as a liquid or dust falling down on the duct upper plate 51 falls, the rib 54 blocks the flow of the foreign material forward.

  FIG. 7 is a diagram illustrating a dimensional relationship between the casing 1 and the air path unit 40 of the induction heating cooker 100 according to the embodiment. As shown in FIG. 7, if the outer dimension in the depth direction of the air passage unit 40 is D and the inner dimension in the depth direction of the lower part inside the housing 1 is E, D and E are substantially the same dimension. Here, the outer dimension D and the inner dimension E are “substantially the same dimension” when the air path unit 40 is accommodated in the lower part of the housing 1 and the air path unit 40 is moved in the front-rear direction by the inner surface of the housing 1. D and E are equal to each other, or D is slightly smaller. As described above, the air path unit 40 is incorporated into the casing 1 by making the outer dimension D in the depth direction of the air path unit 40 and the inner dimension E in the depth direction of the inner lower portion of the casing 1 approximately the same. Sometimes, the play of the air path unit 40 in the depth direction can be suppressed. Therefore, it is not necessary to fix the air path unit 40 and the housing 1 in the depth direction by using another member such as a screw. For this reason, the number of parts can be reduced, the weight of the induction heating cooker 100 can be reduced, and the number of assembling operations can also be reduced.

FIG. 8 is a diagram for explaining the operation of assembling the air passage unit 40 according to the embodiment to the housing 1. FIG. 8A shows a state in the middle of assembling the air passage unit 40 to the housing 1, and FIG. 8B shows a state in which the air passage unit 40 is attached to the housing 1.
When assembling the air path unit 40 to the housing 1, as shown in FIG. 8A, the front portion of the air path unit 40 is put into the housing 1 through the opening 18 first, and the air path unit 40. The air path unit 40 is put into the housing 1 while rotating the rear side portion in the vertical direction. Then, as shown in FIG. 8B, the air path unit 40 is accommodated in the lower part in the housing 1.

  As shown in FIG. 8B, in the state where the air path unit 40 is assembled in the housing 1, the air path unit 40 is inserted into the space formed below the overhanging wall 113 of the housing 1. The Therefore, the space below the projecting wall 113 of the housing 1 can be effectively utilized without making it a dead space.

  FIG. 9 is a diagram for explaining the screwing positions of the substrate holding base 41 and the substrate cover 42 of the air path unit 40 according to the embodiment, and shows the main part of the housing 1 as viewed from above. The substrate holding base 41 and the substrate cover 42 that constitute a part of the air path unit 40 are combined vertically and fixed with screws 45. In the present embodiment, the substrate holding base 41 and the substrate cover 42 are stopped by the four screws 45. As shown in FIG. 9, the stop position of the screw 45 is inside the opening 18 of the housing 1 when viewed from above. That is, the screw 45 is fastened behind the upper part 111 of the front wall of the housing 1 (upper side of the paper surface in FIG. 9) and forward of the rear wall 12 (lower side of the paper surface of FIG. 9). It is not hidden by the overhanging wall 113. For this reason, when assembling the induction heating cooker 100, the assembly operator can easily confirm that the screw 45 has been forgotten to be tightened by looking into the opening 18 of the housing 1 from above. Moreover, the maintenance operator who performs the maintenance of the induction heating cooker 100 inserts a screwdriver from the opening 18 of the housing 1 and removes the screw 45 without taking out the entire air path unit 40 from the housing 1. Since the board cover 42 can be removed and components in the board cover 42 can be confirmed, work efficiency is good.

[Operation and action of induction cooking device]
Next, the operation and action of the induction heating cooker 100 according to the embodiment will be described. Here, with reference to FIG. 3, it demonstrates centering around the flow of the cooling air which arises when the cooling fan 43 operate | moves.
When cooking with the heating port 3 provided with the heating coil 7, the user places a heated object such as a pan on the heating port 3 of the top plate 2 and instructs the operation unit 4 to start heating. Is input, high-frequency power is supplied from the inverter circuit board 20 to the heating coil 7, and the object to be heated placed on the top plate 2 is induction-heated. Then, the cooling fan 43 starts operating.

  As shown in FIG. 3, when the cooling fan 43 operates, the air outside the housing 1 is sucked into the housing 1 from the rear air inlet 14 by the suction action of the cooling fan 43, and the first intake air passage An air flow toward the cooling fan 43 is formed in 61. A space allowing ventilation is provided between the housing 1 and the drop hole 205 of the kitchen cabinet 200, and air in the drop hole 205 is sucked into the housing 1. Further, since the drop hole 205 communicates with the outside of the kitchen cabinet 200 through the intake opening 207, the air outside the kitchen cabinet 200, that is, the air inside the kitchen, flows from the rear intake port 14 into the housing 1. It will be sucked into.

  Further, when the cooling fan 43 is operated, a suction force is also generated in the front air inlet 15 communicating with the suction side of the cooling fan 43, and air outside the housing 1 passes through the front air inlet 15 and enters the inside of the housing 1. The air flow toward the cooling fan 43 is formed in the second intake air passage 62. The power supply board 30 is disposed in the second intake air passage 62, and the power supply board 30 is cooled by the cooling air flowing through the second intake air passage 62 passing around the power supply board 30. The cross-sectional area (maximum value) of the power supply board 30 in the direction orthogonal to the flow direction of the cooling air in the second intake air passage 62 is smaller than the cross-sectional area of the second intake air passage 62 in the same direction. 30 does not block the flow of the cooling air in the second intake air passage 62. In the present embodiment, the suction side of the cooling fan 43 is disposed closer to the rear of the housing 1, whereas the front intake port 15 that is the inlet of the second intake air passage 62 is formed on the front surface of the housing 1. Therefore, the distance of the second intake air passage 62 can be secured, and the space below the overhanging wall 113 in the housing 1 can be effectively utilized as a space for cooling the parts to be cooled.

  The air heated by the heat of the power supply board 30 when flowing through the second intake airflow path 62 and passing around the power supply board 30 joins the air flowing through the first intake airflow path 61 on the suction side of the cooling fan 43. To do. Since the air flowing through the first intake air passage 61 is relatively cool air (room temperature) sucked from the outside of the housing 1, the temperature is lower than that of the air that has passed through the second intake air passage 62 and is heated. The cooled air is sent out from the cooling fan 43. For this reason, the components arranged on the discharge side of the cooling fan 43 can be efficiently cooled.

  A part of the cooling air sent from the cooling fan 43 flows through the first blowout air passage 63, that is, the inside of the substrate cover 42, and passes around the inverter circuit board 20. By passing the cooling air around the inverter circuit board 20, the heat sink 23 mounted on the inverter circuit board 20 is cooled, whereby the switching element 22 is also cooled and the increase in temperature is suppressed. The switching element 22 of the inverter circuit board 20 is particularly easily heated among the components in the induction heating cooker 100. However, since the inverter circuit board 20 is arranged on the discharge side of the cooling fan 43, the cooling fan 43 Most of the cooling air sent out from is supplied to the inverter circuit board 20, and the inverter circuit board 20 can be efficiently cooled. Then, the cooling air that has passed through the first blowing air passage 63 is blown out from the cooling air outlet 421 formed on the upper surface of the substrate cover 42. The cooling air outlet 421 opens at a position behind the overhanging wall 113 of the housing 1 in a state where the air passage unit 40 is incorporated in the housing 1, and the cooling air blown out from the cooling air outlet 421 is overhanging the wall. It flows smoothly into the heating coil 7 without colliding with 113.

  The cooling air blown out from the cooling air outlet 421 is blown to the heating coil 7 disposed on the cooling air outlet 421, passes through the vicinity of the heating coil 7, and is heated by the cooling air passing through the vicinity of the heating coil 7. The coil 7 is cooled.

  A part of the cooling air sent from the cooling fan 43 flows through the second blowing air passage 64, that is, the air passage formed between the substrate cover 42 and the duct forming member 50, and then the duct forming member 50. It progresses upward from the gap formed on the front side of the front end portion of the, and is blown to the heating coil 7 and passes through the vicinity of the heating coil 7. The cooling coil sent from the second blowing air passage 64 flows in the vicinity of the heating coil 7 so that the heating coil 7 is cooled. Since no heat generating component is arranged in the second blowing air passage 64, the cooling air supplied from the second blowing air passage 64 to the heating coil 7 is supplied from the first blowing air passage 63 to the heating coil 7. The temperature is lower than that of the cooling air, and the heating coil 7 can be efficiently cooled. Moreover, although the cooling air sent out from the cooling fan 43 is once shunted to the first blowing air passage 63 and the second blowing air passage 64, it is then merged and blown to the heating coil 7, so that the heating coil 7 is made efficient. Can cool well. In addition, the cooling air heated by the heat of the inverter circuit board 20 when passing through the first blowing air passage 63 is mixed with the relatively low-temperature cooling air blown out from the second blowing air passage 64 to lower the temperature. Therefore, a decrease in the cooling efficiency of the heating coil 7 can be suppressed.

  Cooling air passing through the periphery of the heating coil 7 flows toward the rear of the top plate portion 2 in which the exhaust ports 17 are formed along the lower surface of the top plate portion 2. Since the duct forming member 50 provided on the lower side of the exhaust port 17 covers the upper side of the suction side of the cooling fan 43, it is blown from the cooling fan 43 and heated by the heat of the inverter circuit board 20, the heating coil 7, and the like. The cooled cooling air can be prevented from being re-intaken into the suction side of the cooling fan 43. In addition, since the duct forming member 50 is provided, even when the exhaust port 17 is provided above the air path unit 40, liquid or foreign matter that has flowed into the housing 1 from the exhaust port 17 may be removed. It is possible to suppress the influence on the internal parts. Therefore, failure of components in the housing 1 is reduced, and the induction heating cooker 100 that can be used for a long time can be obtained. Moreover, since the exhaust port 17 can be provided above the air path unit 40, the exhaust port 17 can be formed over the both right and left sides of the top plate part 2 as shown in FIG. Therefore, since the area of the exhaust port 17 can be expanded as compared with the conventional induction heating cooker in which the exhaust port 17 is formed only on either the left or right side of the top plate 2, the pressure loss is reduced and the air volume is increased. In addition, the cooling efficiency can be increased. Moreover, since pressure loss falls, the rotation speed of the cooling fan 43 can be made low and the noise accompanying the driving | operation of the cooling fan 43 can be reduced.

  And the cooling air which flowed back along the lower surface of the top-plate part 2 flows out of the induction heating cooking appliance 100 from the exhaust port 17. Since the exhaust port 17 is provided in the back of the top plate part 2, the air which flows out from the exhaust port 17 is easy to circulate through the inside of a kitchen, and can suppress the partial temperature rise of a kitchen. Further, in the present embodiment, air is exhausted from the exhaust port 17 provided at the rear of the top plate portion 2, whereas the air supplied as cooling air into the housing 1 is in front of the induction heating cooker 100. Therefore, it is difficult for the high-temperature air exhausted from the induction heating cooker 100 to be sucked in at a high temperature, and a decrease in cooling efficiency can be suppressed. In addition, since air close to room temperature is supplied almost constantly into the housing 1, the cooling efficiency can be stably maintained.

  Further, since the top plate portion 2 is not provided with an intake port, the opening area of the exhaust port 17 can be increased as compared with the case where both the intake port and the exhaust port are provided in the top plate portion 2. In particular, in the present embodiment, the total width dimension of the two exhaust ports 17 is approximately the same as the width dimension of the housing 1. Thus, by increasing the opening area of the exhaust port 17, smooth exhaust can be performed at the exhaust port 17 than when the opening area is small, and the cooling air can be circulated efficiently.

  Further, since the two intake ports, the rear intake port 14 and the front intake port 15, are provided, the intake area is expanded and the cooling air volume is increased as compared with the case where one intake port is provided, thereby improving the cooling efficiency. be able to. Moreover, since the back surface intake port 14 and the front surface intake port 15 face the direction different from the top-plate part 2, the vapor | steam and the oil smoke which arise on the upper side of the top-plate part 2 by heating cooking are the back-surface intake port 14 and the front surface intake Difficult to be sucked from mouth 15. Therefore, it is possible to suppress the failure of the component due to the steam and oil smoke flowing around the component such as the inverter circuit board 20 and the power supply board 30 together with the cooling air.

  In addition, while providing a plurality of intake ports, the rear intake port 14 and the front intake port 15, a plurality of intake air passages, a first intake air passage 61 and a second intake air passage 62, each of which serves as an inlet, Since the cooling fan 43 is an axial fan having only one suction side, the air that has passed through the plurality of intake air passages is mixed on the suction side (upstream) of the cooling fan 43. Therefore, even when any one of the plurality of intake air paths is used as an air path for cooling the component to be cooled, the air heated by the component to be cooled is sent out from the cooling fan 43 at that temperature. In other words, the influence on the cooling efficiency of the component to be cooled arranged on the discharge side of the cooling fan 43 can be reduced.

  Moreover, since the induction heating cooking appliance 100 of this Embodiment can cool the to-be-cooled components inside the housing | casing 1 efficiently as mentioned above, the rotation speed of the cooling fan 43 can be suppressed. Therefore, power consumption and noise of the cooling fan 43 can be suppressed.

  In the present embodiment, the rear intake port 14 is provided on the rear wall 12 of the housing 1. However, the rear intake port 14 may not be provided, or another side wall 13 of the housing 1 may be provided. An air inlet may be formed. When the intake area is increased, the pressure loss is reduced and the cooling efficiency can be increased. Therefore, the intake air is sucked into the rear wall 12 and the side wall 13 of the housing 1 in consideration of the amount of cooling air necessary for cooling the components in the housing 1. A mouth may be provided.

Further, in the present embodiment, the example in which the power supply board 30 is arranged in the second intake air passage 62 has been shown. However, when there is a space for installing the power supply board 30 between the board holding base 41 and the board cover 42. May arrange the power supply board 30 in the space.
Moreover, you may install to-be-cooled components, such as an inverter circuit board which drives some of the some heating coils 7, for example in the 2nd intake air path 62. FIG.
In addition, a second cooling fan that sucks external air from the front air inlet 15 and sends it to the suction side of the cooling fan 43 may be installed in the second intake air passage 62.

  Moreover, although the example which provides an axial-flow fan as the cooling fan 43 was shown in the said embodiment, if it is an air path structure which can make the air attracted | sucked from a some air path merge on the upstream side of a fan Other fans (blowers) can be used.

  DESCRIPTION OF SYMBOLS 1 Case, 2 Top plate part, 2a plate, 2b Plate frame, 3 Heating port, 4 Operation part, 5 Display part, 6 Grill part, 7 Heating coil, 11 Front wall, 12 Rear wall, 13 Side wall, 14 Back surface intake , 15 Front air inlet, 16 Front air inlet cover, 17 Exhaust port, 18 opening, 20 Inverter circuit board, 21 board, 22 Switching element, 23 Heat sink, 30 Power board, 31 board, 32 Power circuit part, 40 wind Road unit, 41 Substrate holder, 42 Substrate cover, 43 Cooling fan, 44 Power supply substrate holder, 45 Screw, 50 Duct forming member, 51 Duct upper plate, 52 Duct side plate, 53 Duct upper plate inclined surface, 54 Rib, 61 First intake air passage, 62 Second intake air passage, 63 First blowout air passage, 64 Second blowout air passage, 100 Induction heating cooker, 111 Previous Upper wall, 112 Lower front wall, 113 Overhang wall, 200 Kitchen cabinet, 201 Cabinet top plate, 202 Cabinet rear wall, 203 Cabinet bottom plate, 204 Cabinet side plate, 205 Drop hole, 206 Cabinet opening, 207 Air intake opening, 411 Support plate, 412 Upper peripheral wall, 413 Lower peripheral wall, 414 Holding stand lower inlet, 421 Cooling air outlet.

Claims (11)

A housing having an opening on the top surface and a front air inlet on the front wall;
A top plate portion placed on the opening of the housing and having an exhaust port formed at the rear;
A heating coil that is arranged in the housing and induction-heats an object to be heated placed on the top plate part;
An inverter circuit board for driving the heating coil,
A built-in type induction heating cooker housed in a drop hole formed in the kitchen,
A cooling fan that sends out air sucked from the front air inlet as cooling air, a board holding base that holds the cooling fan and the inverter circuit board, and a top of the inverter circuit board so as to cover the top of the inverter circuit board An air path unit having a substrate cover to be attached and sending the cooling air to the heating coil;
A duct forming member that is attached to and detached from the housing separately from the air path unit, and that vertically partitions between the exhaust port and the suction side of the cooling fan,
In the case, the lower part of the front wall projects to the front side with respect to the upper part of the front wall, and the lower end of the upper part of the front wall and the upper end of the lower part of the front wall are connected by the projecting wall,
A front portion of the air path unit is disposed in a space below the projecting wall in the housing, and the air path unit is positioned in the front-rear direction by an inner surface of the lower front wall and an inner surface of the rear wall. An induction heating cooker characterized by 2. The induction heating cooker according to claim 1, wherein a rear end portion of the duct forming member is in contact with an inner surface of a rear wall of the casing in a state of being attached to the casing. The induction heating according to claim 1 or 2, wherein the screwing position for attaching the substrate cover to the air path unit is provided within the range of the opening of the housing as viewed from above. Cooking device. The induction heating cooker according to any one of claims 1 to 3, wherein a rib protruding upward is provided on the upper surface of the duct forming member over the width direction. The induction heating cooker according to any one of claims 1 to 4, wherein an upper surface of the duct forming member is inclined. The cooling fan is an axial fan, and the discharge side for discharging cooling air is installed in a direction facing the lower part of the front wall of the housing,
The said induction circuit board is installed in the discharge side of the said cooling fan. The induction heating cooking appliance as described in any one of Claims 1-5 characterized by the above-mentioned. A part of the discharge surface of the cooling fan is located above the substrate cover,
Cooling air sent from the discharge surface of the cooling fan located above the substrate cover reaches the heating coil without passing through the space between the substrate cover and the substrate holder. The induction heating cooker as described in any one of Claims 1-6. The front part of the duct forming member and the rear part of the substrate cover are installed so as to overlap each other when viewed from above,
Between the front part of the duct forming member and the rear part of the substrate cover, there is formed an air path through which cooling air sent from the discharge surface of the cooling fan located above the substrate cover flows. The induction heating cooker according to claim 7. The lower intake air passage extending from the front air inlet to the suction side of the cooling fan is formed below the substrate holding table of the air passage unit. The induction heating cooker according to any one of the above. The induction heating cooker according to claim 9, wherein a circuit board is installed in the lower intake air passage. A rear intake port is formed on the rear wall of the housing,
The air path extending from the front air inlet to the suction side of the cooling fan and the air path extending from the rear air inlet to the suction side of the cooling fan merge on the suction side of the cooling fan. The induction heating cooking appliance as described in any one of Claims 1-10.

Images