JP4292116B2 - Induction heating cooker - Google Patents

Description

  The present invention relates to a cooling structure for an induction heating cooker.

  The induction heating is performed due to an eddy current generated near the surface of the cooking pan by supplying a high-frequency current to a heating coil provided below the cooking pan and a magnetic field generated around the heating coil.

  In addition, the amount of heat that does not contribute to heating of the cooking pan with respect to the electric power supplied to the heating coil generates heat from the electronic components of the circuit board and the heating coil, so the circuit board and the heating coil are cooled by incorporating a fan device. The configuration is common.

  In the built-in type induction heating cooker installed on the kitchen table, the fan device is sucked from the vent hole provided on the back side of the top plate. The configuration is such that the parts do not touch the liquid.

  For example, in Patent Document 1, a water drain hole or a jetty portion that prevents inflow is provided at the bottom of the intake duct.

  Further, in Patent Document 2 that sucks air from the side, a configuration is adopted in which a shielding plate is provided between the air inlet and the fan, and liquid or the like that has entered from the air inlet is drained between the shielding plate and the air inlet.

JP 11-339946 A

JP-A-9-45471

  In the conventional cooking device, since the fan device easily sucks high-temperature air from the drain port, the temperature of the cooling air blown out from the fan device rises, and the cooling performance of electronic components, heating coils, etc. is not good.

  Moreover, a short circuit of the flow is generated inside the kitchen table, and the air volume of the fan device sucked from the top frame is reduced.

  Therefore, to improve cooling performance, it is necessary to increase the size of the fan device and increase the number of rotations of the fan. However, it is difficult to increase the size of the fan device with an induction heating cooker that is housed in a standard-sized kitchen table. The increase in the number makes the kitchen environment worse due to increased noise such as motor noise of the fan device and wind noise (fluid noise) of parts.

  The present invention has been made to solve at least one of the above problems.

In Claim 1 of this invention, the main body of the built-in type induction heating cooking appliance installed in the kitchen stand of a system kitchen, the top plate arrange | positioned at the upper surface of this main body, and the heating arrange | positioned under this top plate fan device for cooling the coil, and a circuit board on which electronic components are mounted for supplying a high-frequency current to the heating coil, and the heating coil is disposed behind the circuit board as viewed from the front side of the main body of the circuit board When the ventilation port provided in the rear portion of the top frame for holding the top plate, are possible circulation of air between the interior and the kitchen table and the bottom of the unit space of the body provided at the bottom of the body in the induction heating cooker penetration liquid from the vent and a water discharge portion for discharging outside the body, provided with the drainage portion in the bottom front side of the body, suction of the fan device The flow path length from part to the ventilation openings, the smaller than the flow passage length from the fan device to the drainage unit, the fan unit by outside air sucking flow path from the vent to the air intake of the fan device the ventilation resistance is obtained by less than the channel flow resistance of up to the drainage portion for discharging the fluid from the intake portion of the fan device.

  According to the first aspect of the present invention, the intrusion of hot air from the drainage portion into the fan device is reduced, and the rise in the temperature of the cooling air blown out from the fan device is suppressed, so that the heat generating components such as the heating coil are cooled with a small air flow rate. It is possible to increase the cooling effect of the heat generating component and perform stable induction heating cooking.

Also, liable actively takes in outside air from the water discharge portion by fan devices, low air volume by suppressing kitchen table internal short circuit, and can perform cooking with low noise.

Further, since the spaced apart drainage unit and fan unit, it is possible to suppress the intrusion of warm air through the drainage unit, the drainage liquid easily flows from the kitchen table to the outside, to keep the surrounding kitchen clean it can.

  Examples of the present invention will be described below.

  1, 2 and 3 show an example of the induction heating cooker according to the present invention. The built-in type (system kitchen integrated type) in which three pan mounting parts 73a, 73b and 73c are provided on the top plate 70. FIG. ) Induction heating cooker.

  Here, FIG. 1 is a side sectional view of the induction heating cooker viewed from the pan mounting portion 73a side, FIG. 2 is a perspective assembly view thereof, and FIG. 3 is a front sectional view thereof.

  In this embodiment, the pan mounting portions 73a and 73b for supplying induction heat to the cooking pot (not shown) by supplying a high frequency current to the heating coil 20 are heated to the left and right by the radiant heat of the electric heater 10. Although it is the structure which has arrange | positioned the part 73c in the center back, what is necessary is just the induction heating cooking appliance which provided the one pan mounting part which carries out the induction heating with the heating coil 20 at least.

  In the figure, a top plate 70 is disposed on the upper surface of the main body 7 of the induction heating cooker, and the periphery thereof is covered with a top frame 72 and placed on the upper surface of the main body 7.

  Ventilation holes 71a and 71b through which the air inside the main body 7 enters and exits are provided at the rear part of the top frame 72, and an upper operation panel 6b for operating the cooking pan and the like is provided at the front.

  Moreover, the heating coil 20 is provided below the top plate 70 so as to be positioned substantially below the pan mounting portions 73a and 73b, and the electric heater 10 is provided at a substantially lower position of the pan mounting portion 73c. It has been. The pan placing parts 73a and 73b place a metal pan that can be induction-heated, and the pan placing part 73c is not capable of induction heating, for example, can be cooked by placing a clay pot or the like.

  In addition, a front frame 68 is attached to the front surface of the main body 7, that is, the front surface, a roaster 8 including a heater 11 and a grill 12 is disposed on the left side, and the cooking pan is heated on the right side of the front surface. And an operation panel 6 a for operating the heating condition of the roaster 8, and the heating power adjustment amount is displayed on the display panel 65 below the top plate 70.

  The operation panel 6 is provided with a main power supply 66 and a heating power adjustment dial 67, and the main power supply 66 is connected to an outlet 1 provided on the rear side of the main body 7.

  That is, since the roaster 8 is disposed on the left side of the main body 7, most of the circuit board 43 on which electronic components such as an inverter are mounted for induction heating of the heating coil 20 is located on the right side of the main body 7. Mounted on the substrate case 4.

  In the present invention, the roaster 8 and the operation panel 6 are not fixed to the illustrated positional relationship. For example, the roaster 8 may be provided at the front center or the right side of the main body 7 or may be operated on the front. A configuration in which either the panel 6a or the upper operation panel 6b is arranged may be employed.

  The volume of the circuit board 43 is determined by the number of electronic components 41 and 42 and the number of heat sinks 40 and the number of wirings installed on the highly heat generating electronic component 41. Therefore, the more electronic components 41 and 42, the closer to the roaster 8 side. In the space, a plurality of sheets are arranged with high density according to the volume shape.

  Here, the substrate case 4 is provided in a box shape in order to improve the workability when the circuit board 43 or the like is stored inside the main body 7, but the circuit board is directly provided inside the main body 7. For example, 43 may be directly installed.

  In the present embodiment, the circuit board 43 is stacked in three stages in the height direction of the board case 4. However, a plurality of circuit boards 43 may be juxtaposed in the width direction. It arrange | positions in parallel with the flow direction of the cooling air which blows off.

  The fan device 5 is a sirocco fan that includes a fan 51, a fan motor (not shown), and a casing 52, and is disposed behind the circuit board 43 in the board case 4 when viewed from the front side of the main body 7.

  Further, the space between the fan device 5 and the circuit board 43 is separated by a partition plate 55 provided inside the substrate case 4 except for the blowing portion 5a of the fan device 5, and the blowing portion of the fan device 5 is separated. The air 86 blown out from the circuit board 43 toward the circuit board 43 flows backward and does not enter the intake section 5b of the fan device 5.

  That is, in this configuration, the air 81 sucked from the ventilation port 71 a by the fan device 5 is blown out toward the space of the circuit board 43 through the blowing portion 5 a of the fan device 5.

  Here, the contact portion between the blow-out portion 5a and the partition plate 55 is provided with a step or unevenness to reduce the gap, or a heat-resistant elastic member, for example, silicon rubber or resin is sandwiched, thereby reducing air leakage. The cooling effect by the fan device 5 can be enhanced.

  In the fan device 5 in the substrate case 4, the outside air 81 is sucked from the ventilation port 71 a on the top frame 72 through the air intake duct 60 on the back side of the main body 7, and the air is sucked from the side surface of the fan 51.

  The induction heating cooker is provided with a plurality of drainage ports in preparation for the case where the liquid 100 or the like in the cooking pan spills and enters from the ventilation port 71. For example, even if the liquid 100 enters from the ventilation port 71a, the fan device 5 is provided. In order to prevent the circuit board 43 from getting wet, a drain hole 49 of the board case is provided below the intake portion 5b.

  In addition, a rectifying plate 48 is provided below the intake duct 60, and is configured so as to suppress scattering of the liquid 100 that has vigorously entered and hardly enter the fan 51 directly.

  The liquid 101 drained from below the rectifying plate 48 and from the drain hole 49 of the substrate case 4 passes through the gap 47 between the substrate case 4 and the main body 7 and from the drainage section 78 provided on the front side of the main body 7 to the kitchen table 9. It is discharged into the gap 90 of the main body 7.

  In the present embodiment, by reducing the gap 47 between the substrate case 4 and the main body 7, the ventilation resistance of the flow path from the intake portion 5 b to the ventilation port 71 a of the fan device 5 is reduced, and the flow resistance from the intake portion 5 b to the drainage portion 78 is reduced. It is smaller than the draft resistance of the road.

  That is, the flow path length from the intake section 5b to the vent 71a is made longer than the flow path length from the intake section 5b to the drain section 78, and the flow resistance of air entering from the drain section 78 is increased.

  Further, the ventilation resistance of the flow path from the intake portion 5 b to the drainage portion 78 can be adjusted by the air path cross-sectional area of the gap 47 between the substrate case 4 and the main body 7. In addition, as shown in FIG. 3, if the flow path 46 is separately provided below the substrate case 4, the direction of draining the liquid can also be adjusted.

  Here, the flow path 46 includes a rib 46a provided on the bottom surface of the substrate case 4 and the bottom surface of the main body 7, and the flow resistance varies depending on the gap between the ribs 46a at both ends and the height of the rib 46a.

  For example, in order to further reduce the flow resistance, the height of the ribs 46a may be reduced so as to reduce the cross-sectional area of the flow path 46, the interval between the ribs 46a may be reduced, or a protrusion may be provided in the flow path.

  With this drainage configuration, the amount of air that has risen in the space 90 between the kitchen table 9 and the main body 7 flows into the fan device 5 through the drainage section 78, and the temperature of the air blown to the circuit board 43 increases. It becomes difficult, and the circuit board 43 etc. can be cooled efficiently.

  Here, in the present embodiment, the rotation axis of the fan device 5 has a horizontal fan structure, but with the rotation axis set to the vertical direction, the intake portion 5b of the fan 51 is either the upper surface or the lower surface of the fan device 5. It is also possible to employ a configuration in which both of them are used, and it is needless to say that the liquid scattered by the rectifying plate 48 is more difficult to enter the intake portion 5b even with this structure.

  In addition, if the ribs that divide the inside of the fan 51 are provided with a rotating shaft and the air intake portions 5b are provided on both sides of the fan device 5, air is efficiently sucked into the fan 51, and the blowing performance of the fan device 5 is good. Thus, the circuit board 43 and the heating coil 20 can be cooled.

  Although the illustrated fan device 5 is a sirocco fan, it goes without saying that a turbo fan, an axial fan, or the like can be cooled by a similar drainage configuration.

  The air 86 for cooling the circuit board 43 enters the duct 3 provided above the substrate case 4, that is, below the heating coil 20, and blows out air toward the display panel 65 and the left and right heating coils 20.

  The coil base 21 on which the heating coil 20 is placed is supported by at least three elastic support portions 27 using, for example, springs, and is pressed against the top plate 70 by the support portions 27. Thus, a thermistor, for example, a contact temperature sensor provided in the sensor portion 29 of the coil base 21 is in good contact with the top plate 70.

  The air that has entered the duct 3 from the substrate case 4 through the lower opening 3b of the duct 3 is diverted to cool the left and right heating coils 20, and a part of the air flows from the opening 3a of the duct 3 to the right coil base. The remaining air is blown toward the left coil base 21 and the display panel 65 through the duct 3.

  Also, the air whose temperature has risen due to the heat of the left and right heating coils 20 flows in the space below the top plate 70 toward the left side and the back of the main body 7, and the air vent 71 b and the left side on the top frame 72. The exhaust holes 63 are exhausted to the outside.

  Here, if the amount of air passing through the circuit board 43 is insufficient for cooling the display panel 65, another cooling fan may be provided in the vicinity of the display panel 65. You may make it the structure cooled using the low temperature air suck | inhaled from the side surface or the front surface.

  Further, in the present embodiment, the air intake 81 of the fan device 5 is configured to be performed through the air vent 71 a disposed on the top frame 72, but in order to increase the amount of blown air of the fan device 5, it is separately provided on the side surface of the main body 7. An air inlet may be provided.

  Further, the exhausts 83 and 84 may have a configuration in which an exhaust port is provided on the side surface of the other main body 7 to reduce the ventilation resistance of the air blown out of the main body 7.

  The operation of the induction heating cooker having the above-described configuration will be described with reference to FIGS. 1 to 3 by taking as an example the case where the cooking pan is arranged on the right side pan placing portion 73a on the top plate 70.

  For example, the cooking pot containing liquid such as water is heated by placing the cooking pot on the pan placing portion 73 a on the top plate 70 and then main power 66 of the operation panel 6 a provided in front of the main body 7. And, for example, by rotating the heating power adjustment dial 67, heating control according to the heating power adjustment amount displayed on the display panel 65 disposed in front of the top plate 70 is performed.

  Further, in the induction heating cooker of the present embodiment, the operation panel 6b is provided on the top frame 72, and the same operation as the operation panel 6a can be performed on the operation panel 6b.

  The heating coil 20 located below the cooking pan is controlled to supply a high-frequency current according to the heating power adjusted by the operation panel 6a or 6b, and induction heating of the cooking pan is performed while adjusting the heating power. it can.

  Further, at the same time as the current flows through the heating coil 20, the fan device 5 is operated and the cooling air 81 is sucked from the intake duct 60 located below the ventilation port 71 a on the top frame 72, and the fan disposed inside the substrate case 4. The air is supplied to the device 5.

  When the cooking pan is induction-heated with the heating coil 20, the heating efficiency depends on the material of the cooking pan, and the heat loss becomes the heat generation of the heating coil 20 and the electronic components 41 and 42 on the circuit board 43, respectively. The component temperature will rise.

  Here, for example, an aluminum heat sink is disposed in the highly heat generating electronic component 41 to efficiently cool it.

  The air 81 flowing in from the air intake duct 60 flows into the fan 51 from the air intake portion 5b on the side surface of the fan device 5, and from the blowout portion 5a of the fan device 5 provided on the partition plate 55 partitioned from the circuit board 43 side. Thus, the cooling air 86 is blown out toward the cooling air 43.

  Further, in this embodiment, the drainage part 78 is arranged at a position where the ventilation resistance becomes larger than the ventilation resistance of the flow path from the intake part 5b of the fan device 5 to the ventilation hole 71a. Most of the air is supplied to the fan device 5.

  For this reason, even when the temperature of the kitchen table 9 or the main body 7 rises in long-time cooking, the fan device 5 hardly sucks warm air in the gap 90 between the kitchen table 9 and the main body 7. An increase in the blown air temperature can be suppressed.

  In the present embodiment, the circuit board 43 is arranged in three stages in the height direction on the board case 4, and the cooling air 86 blown from the fan device 5 moves the gaps of the circuit board 43 from the back side of the main body 7 to the front side. It flows toward.

  The air that has cooled the circuit board 43 flows through the duct 3 provided on the ceiling surface of the board case 4 to cool the left and right heating coils 20 and the display panel 65.

  Here, in this embodiment, all the air that has cooled the circuit board 43 cools the left and right heating coils 20 and the display panel 65 through the duct 3. However, a separate air path is formed from the board case 4. Alternatively, a small fan may be arranged and cooled.

  The air that has cooled the heating coil 20 and the display panel 65 flows around the coil base 21, and a part of the air is exhausted to the outside from the exhaust port 62 at the rear of the main body 7 through the ventilation port 71 b of the top frame 72. Is exhausted to the outside through the gap between the main body 7 and the kitchen table 9 from the exhaust hole 63 on the left side surface of the main body 7.

  Here, the fan device 5 may be controlled stepwise in advance by the amount of heating adjustment by the operation panel 6a, or may be airflow controlled steplessly. Moreover, you may make it the structure which measures the temperature of the heating coil 20 and the electronic component 43, and performs air volume adjustment by ON / OFF control or intermittent operation.

  Even if the cooking pan falls, the kitchen table 9 and the top frame 72 are arranged in close contact with each other with an elastic member such as silicon rubber so that the liquid enters the inside of the main body 7. There is nothing.

  However, liquid may enter the inside of the main body 7 from the vent 71a. Since the air vent 71a is located closer to the substrate circuit 43 than the air vent 71b, a structure is required to efficiently drain water and prevent the liquid from touching the substrate circuit 43 while maintaining fan performance.

  The liquid entering from the ventilation port 71a collides with the rectifying plate 48 disposed below the intake duct 60 and the momentum is suppressed, and the scattering of the liquid is suppressed.

  Further, the decelerated liquid flows below the rectifying plate 48 and is drained, and the liquid partially scattered on the fan device 5 side drains holes 49 on the bottom surface of the substrate case 4 below the fan device 5 before entering the intake portion 5b. Flows down from.

  The liquid coming out of the rectifying plate 48 and the drainage hole 49 flows toward the drainage part 78 provided on the front side of the main body 7 through the gap 47 between the bottom surface of the substrate case 4 and the main body 7 and enters the gap 90 between the main body 7 and the kitchen table 9. Discharged.

  In addition, when the flow path 46 is provided below the substrate case 4, the water is similarly discharged.

  Thus, with the drainage configuration of the present embodiment, stable cooking can be performed while maintaining the cooling performance of the heating coil 20 and the substrate circuit 43 while coping with the intrusion of the liquid from the ventilation port 71a.

  Further, even if the temperature of the kitchen table 9 rises, high-temperature air hardly flows into the air intake portion 5b of the fan device 5, and a high cooling effect can be obtained even with a small amount of air. Therefore, an induction heating cooker that suppresses fan noise and fluid noise is provided. Realized and can provide a quiet kitchen environment.

  FIG. 4 shows a side sectional view of the coil unit 2 in the second embodiment.

  In the present embodiment, the fan device 5 disposed in the substrate case 4 has a horizontal fan rotation and is provided with an intake portion 5b above and below, and a drain hole 49 in the substrate case 4 and a drain portion 78 in the main body 7 A liquid reservoir 44 is provided in the gap 47 between the two.

  Here, the air flow configuration for cooling the circuit board 43 and the heating coil 20 and the operation method during cooking in this embodiment are the same as those in the first embodiment, and a description thereof will be omitted.

  The liquid storage unit 44 temporarily stores the liquid 100 even when there is a large amount of the liquid 100 that has entered from the ventilation port 71a, and reduces the amount of the drainage 101 flowing from the drainage unit 78 of the main body 7 to the kitchen table 9, It is the structure which suppresses that a liquid flows out from the front of the kitchen stand 9 in the middle of cooking. In this case, the gap 47 can be made narrower than that of the embodiment of FIG. 1, and warm air from the drainage section 78 can be further suppressed from flowing in.

  Here, if the liquid storage part 44 is the structure which can be removed and wash | cleaned from the front of the kitchen stand 9, cleaning property will become more favorable and can provide a clean kitchen environment.

  Here, it goes without saying that the liquid reservoir 44 can be easily mounted even in a structure in which the flow path 46 is provided below the substrate case 4 as shown in FIG.

  Further, in this embodiment, the drainage portion 79 is also provided in the main body 7 on the lower side of the rectifying plate 48 located below the intake duct 60 so that the drainage can be stably performed even when the amount of intrusion water is large. . Even if this drainage part 79 is provided, the air resistance in the gap between the kitchen table 9 and the main body 7 is difficult to suck due to the flow resistance of the rectifying plate 48, and the same effect as in FIG. 1 can be realized.

  FIG. 5 shows a side sectional view of the induction heating cooker in the third embodiment.

  In this embodiment, the opening / closing means 45 is provided in the drain hole 49 of the liquid 100 entering from the ventilation port 71a.

  Moreover, although it is a case where the fan apparatus 5 is comprised with an axial fan, a drainage structure is applicable irrespective of a fan kind.

  Here, the air flow configuration for cooling the substrate circuit 43 and the heating coil 20 and the operation method during cooking in this embodiment are the same as those in the first embodiment, and a description thereof will be omitted.

  The opening / closing means 45 is composed of an elastic body such as a resin film or a rubber plate provided in the drain hole 49, and is installed with the drain hole 49 closed during normal cooking.

  In this embodiment, the liquid flows into the drain hole 49 from above, and the opening / closing means is opened downward by the weight of the liquid, and the liquid is guided from the substrate case 4 to the gap 47 with the main body 7.

  Therefore, if the opening / closing means 45 is constituted by a cantilever beam in which only one end of the drainage hole 49 located far from the drainage part 78 is fixed as shown in the drawing, the structure is simple and efficient drainage can be performed.

  If the opening / closing means 45 is thin and light, the operation of the fan device 5 causes negative pressure on the substrate case 4 side, the opening / closing means 45 is sucked upward, and the drain hole 49 and the opening / closing means 45 are in close contact with each other. The sealing effect can be enhanced.

  Furthermore, if the opening / closing means 45 is provided in the drainage part 78 of the main body 7 or another drainage port (not shown), the airtightness of the main body 7 is improved, and a drainage configuration that can be opened only in the event of liquid intrusion. realizable.

  As described above, according to the drainage configuration of the present invention, it is possible to cope with liquid intrusion from the ventilation port 71a to the main body 7, and it is possible to realize stable cooling performance even when the temperature of the kitchen table 9 rises. In addition, it is possible to obtain an induction heating cooker that has both low noise and low noise and can provide a comfortable kitchen environment.

It is side surface sectional drawing of the induction heating cooking appliance in the 1st Example of this invention. It is a perspective exploded view of the induction heating cooking appliance in the 1st example of the present invention. It is front sectional drawing of the induction heating cooking appliance in the 1st Example of this invention. It is side surface sectional drawing of the induction heating cooking appliance in the 2nd Example of this invention. It is side surface sectional drawing of the induction heating cooking appliance in the 3rd Example of this invention.

Explanation of symbols

3 Duct 4 Board Case 5 Fan Device 6 Operation Panel 7 Body 8 Roaster 9 Kitchen Stand 10 Electric Heater 20 Heating Coil 40 Heat Sink 43 Circuit Board 45 Opening / Closing Means 70 Top Plate 71a Ventilation Port

Claims (1)

A main body of a built-in type induction heating cooker installed on a kitchen table of a system kitchen, a top plate disposed on the upper surface of the main body, a heating coil disposed below the top plate, and a high frequency applied to the heating coil holding a circuit board on which electronic components are mounted to supply current, and a fan device for the arranged behind the circuit board as viewed from the front side of the main body for cooling the circuit board and the heating coil, the top plate A ventilation hole provided at the rear part of the top frame and a liquid provided in the bottom part of the main body and capable of circulating air between the inside of the main body and the space between the kitchen table and the bottom part of the main body , in the induction heating cooker having a water discharge portion for discharging outside the body, provided with the drainage portion in the bottom front side of the body, until the vent from the intake portion of the fan device The channel length, the smaller than the flow passage length from the fan device to the drainage unit, the ventilation resistance of the flow path for sucking air through the vent to the air intake of the fan device by said fan device, said fan device An induction heating cooker characterized in that it is smaller than the ventilation resistance of the flow path from the air intake portion to the drainage portion for discharging liquid.

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