JP2004214217A - Induction heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an induction heating cooker capable of efficiently cooling an induction heating coil and achieving high reliability. <P>SOLUTION: In the cooker including a top plate 9 arranged on a top frame 8 on the upper surface of a main body 1; a coil unit 2 arranged below the top plate 9 and composed of at least an induction heating coil 3 and a coil base 4 with the heating coil 3 mounted thereon; a fan device 16 arranged inside the main body 1; and a duct 17 for inducing the air blown from the fan device 16 into the coil unit 2, a plurality of openings 18 with hole diameters of 3-10mm are arranged on the upper surface of the duct 17 positioned below the coil unit 2, and a flow of a collision jet stream for blowing a cooling air 28 from the many openings 18 to collide against the lower surface of the coil unit 2 is formed. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

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

  In an induction heating cooker, for example, an induction heating type cooking heater (hereinafter referred to as an IH cooking heater), an eddy current is generated in a cooking pot disposed above the induction heating coil mainly due to lines of magnetic force generated by a current flowing through the induction heating coil. It itself generates heat.

  Although the induction heating cooker has a higher thermal efficiency (about 90% in an iron pot) than the thermal efficiency of gas heating (about 40%), heat loss occurs and the induction heating coil and the like generate heat. Needed.

  In the induction heating cooker, in order to obtain the high heat power most required for cooking, it is necessary to increase the amount of eddy current flowing in the cooking pot, that is, to increase the input power. The heat efficiency (for example, 70% or less) of a multi-layered pan or a multi-layer pan is significantly lower than that of an iron pan or the like, and large input power is required to generate a heating amount necessary for cooking.

  However, under conditions of low thermal efficiency with respect to high power input, heat loss (power that does not heat the cooking pot) increases and heat generation of components such as the induction heating coil increases. Since the temperature exceeds the allowable temperature, a cooling structure for suppressing the temperature below the allowable temperature is required.

  A cooling structure in a conventional induction heating cooker has a structure in which cooling air is supplied from a fan device to an induction heating coil and a vicinity of a coil base on which the induction heating coil is mounted, and is disclosed in Patent Document 1. In the example, for cooling the induction heating coil, the rib inside the coil base is configured to be higher than the outer peripheral frame so that an air path through which the cooling air passes between the induction heating coil and the coil base can be configured, In addition, a structure is described in which a large opening is provided in the main body below the induction heating coil, and cooling air is blown from the opening to the induction heating coil.

  Further, in the example disclosed in Patent Document 2, there is described a structure in which a large opening is provided in a substrate base cover that covers a drive circuit board below the induction heating coil, and cooling air is blown from the opening to the induction heating coil. .

JP 2002-43045 A

JP-A-2002-33184.

  In a conventional configuration, an induction heating cooker that supplies cooling air to the vicinity of the induction heating coil, or an induction heating cooking device that provides a large opening below the induction heating coil to blow cooling air to the induction heating coil, The heat transfer is low and the cooling performance is not good, so that the induction heating coil with large heat loss cannot be sufficiently cooled.

  Further, the coil base surface on which the induction heating coil is mounted is small, and the strength of the coil base for fixing the induction heating coil is weak. Therefore, the gap between the top plate surface and the induction heating coil tends to change, and the heating stability is not good.

  Further, there is a problem that the temperature tends to be non-uniform in the direction in which the cooling air flows to the induction heating coil.

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

  In order to solve the above-mentioned problems, the present invention comprises a top plate provided on a top frame on an upper surface of a main body, and at least an induction heating coil provided below the top plate and a coil base on which the induction heating coil is mounted. A coil unit, a fan device provided inside the main body, and a duct for guiding air blown by the fan device to the coil unit, wherein the duct located below the coil unit. A plurality of openings having a hole diameter of 3 to 10 mm are provided on the upper surface, cooling air is blown out from the plurality of openings, and a flow of a multi-hole collision jet is made to collide with the lower surface of the coil unit.

  As described above, according to the induction heating cooker of the present invention, in the induction heating cooker provided with the duct for guiding the air blown by the fan device to the coil unit, the upper surface of the duct located below the coil unit A plurality of openings having a hole diameter of 3 to 10 mm are provided, and cooling air is blown out from the plurality of openings to form a flow of a perforated impingement jet that collides with the lower surface of the coil unit, so that the induction heating coil is efficiently cooled with a small air volume. Thus, the effect of reducing the temperature distribution in the induction heating coil and improving its reliability can be obtained.

  In addition, since cooling can be performed with a small amount of air, noise can be reduced.

  Furthermore, since the hole diameter of the plurality of openings is set to 3 to 10 mm, an opening having a small air path loss and good thermal efficiency can be formed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in FIG. 2 and subsequent figures, a part of the configuration common to the embodiment of FIG. 1 is omitted, and the overlapping description is omitted. The same reference numerals in the drawings of each embodiment indicate the same or corresponding components. If there are two or more identical objects, and it is easier to distinguish and explain them, the parts that do not appear in the figure are also given suffixes such as a, b, c, etc. In the case of, the suffix is not added.

(First embodiment)
FIG. 1 is an exploded perspective view showing a part of an induction heating cooker according to a first embodiment of the present invention. FIG. 1 shows, as an example of the induction heating cooker of the present invention, a built-in type (system) in which a cooking pan rest part by induction heating is provided at two sides on the left and right, and a cooking pan rest part by electric heater heating is provided substantially at the center in the back. (Integrated kitchen) Applied to IH cooking heater.

  Here, it goes without saying that the present invention can be easily applied not only to a built-in type but also to a stationary type (placed directly on a sink) as long as it is an IH cooking heater provided with at least one cooking pot mounting portion by induction heating.

  FIG. 2 is a side cross-sectional view of the periphery of the coil unit of the induction heating cooker, showing the relationship between the coil unit and the flow of cooling air through the duct. This will be described with reference to FIG. FIG. 2A is a side cross-sectional view of the periphery of the coil unit including the coil base cut at a portion where no ferrite is mounted, and FIG. 2B includes a coil base cut at a portion where the ferrite is mounted. It is a side sectional view of a coil unit peripheral part.

  In FIG. 1, reference numeral 1 denotes a main body of an induction heating cooker. Reference numeral 2 (2a, 2b) denotes a coil unit, which has two sets corresponding to two-port induction heating and includes the following four elements.

  Reference numerals 3 (3a, 3b) denote induction heating coils, two of which are provided with eddy currents in a cooking pot (not shown) placed above due to the lines of magnetic force generated by the current flowing therethrough, thereby causing a cooking pot (not shown). ) Heat itself. Reference numeral 4 (4a, 4b) denotes a coil base, two of which have an induction heating coil 3 (3a, 3b) placed and held thereon.

  Reference numeral 5 (5a, 5b) denotes two sets of ferrites, and one set is composed of several rods, and is radially inside the coil base 4 (4a, b) with respect to the induction heating coil 3 (3a, 3b). To stop the downward flow of the lines of magnetic force generated from the induction heating coils 3 (3a, 3b). Reference numerals 6 (6a, 6b) denote temperature sensors, two of which are arranged at the center of the coil unit 2 (2a, 2b) and monitor the temperature of the upper cooking pot (not shown).

  The coil unit 2 (2a, 2b) includes the induction heating coil 3 (3a, 3b), a coil base 4 (4a, 4b), a ferrite 5 (5a, 5b), and a temperature sensor 6 (6a, 6b). ing.

  Reference numeral 7 denotes a radiant heater, which corresponds to heating of a single-port electric heater.

  Reference numeral 8 denotes a top frame, which is provided on the upper surface of the main body 1 and includes the following two elements. Reference numeral 9 denotes a top plate, which is made of heat-resistant glass or the like and on which a cooking pan (not shown) to be heated is placed. Reference numeral 10 denotes a ventilation hole, which is provided at a rear portion on the top frame 8 and allows air to flow between the inside and the outside of the main body 1. The top frame 8 includes the top plate 9 and the ventilation holes 10.

  Reference numeral 11 (11a, 11b, 11c) denotes a cooking pan mounting portion, which indicates a portion on which a cooking pan (not shown) is mounted on the top plate 9, and 11a, 11b correspond to the two induction heating coils 3a, 3b. The reference numeral 11c corresponds to the radiant heater 7 and is disposed substantially at the center in the back.

  Reference numeral 12 denotes an operation panel, which is provided on the front surface of the main body 1 and controls the heating of the induction heating coil 3 and the roaster 15 described later. Reference numeral 13 denotes a main power supply, which is arranged in the operation panel 12 and turns on and off the power of the entire apparatus. Reference numeral 14 denotes a dial, which is arranged in the operation panel 12 and can adjust the heating power by rotating the dial. A roaster 15 is provided on the front of the main body 1 and bake fish and the like.

  Numeral 16 (16a, 16b) is a fan device, two of which correspond to two sets of coil units 2 (2a, 2b), and blow air for cooling the induction heating coil 3 (3a, 3b). Here, the fan device 16 may be, for example, a propeller fan or a sirocco fan. However, as shown in this embodiment, it is desirable that the fan device 16 be large enough to be accommodated in the space between the bottom surface 25 and the top plate 9 described later.

  Reference numeral 17 (17a, 17b) denotes a duct, two of which correspond to the two sets of coil units 2 (2a, 2b), are provided below the coil units 2 (2a, 2b), and have a plurality of openings 18 on the upper surface. Provided. The duct 17 has a substantially circular shape and is connected to a fan device 16 disposed upstream of the duct 17. In this embodiment, the openings 18 are arranged in a circular staggered arrangement. However, the openings 18 need not be circular but may be elliptical or polygonal. Alternatively, the arrangement may be a lattice or radial arrangement. The size, number, and arrangement of the openings 18 change the amount of air supplied by the fan device 16 in conjunction with airflow loss. For example, if the openings 18 are arranged with a hole diameter of 3 to 10 mm and a hole interval of 10 to 40 mm, the wind is reduced. The opening 18 having a small path loss and good thermal efficiency can be formed.

  Reference numeral 19 denotes a support portion which is made of an elastic material such as a spring, and is provided below the coil base 4 so as to support the coil base 4 in at least three places for one coil base 4. The support portion 19 may have a configuration in which the coil unit 2 is pressed against the top plate 9 or a structure that can be in close contact with the top plate 9.

  Reference numeral 20 (20a, 20b) denotes a connection duct, two of which correspond to two sets of coil units 2 (2a, 2b), and connect the fan device 16 (16a, 16b) to the duct 17 (17a, 17b). . The distance L between the fan device 16 and the duct 17, that is, the length of the connection duct 20, in consideration of the air flow resistance, the fan noise, and the mounting of the main body 1, the range of 50 mm to 150 mm is low noise and the flow loss is low. Cooling air can be supplied to the coil unit 2 with a small number of conditions.

  Reference numerals 21 and 22 denote intake ports, which are disposed at the rear of the main body 1 at positions corresponding to the lower side of the vent holes 10 disposed on the top frame 8, the intake port 21 performs intake for the fan device 16 b, and the intake port 22 The intake for the fan device 16a is performed.

  Reference numerals 23 and 24 denote exhaust ports, which are disposed on the rear portion of the main body 1 at positions corresponding to the lower side of the vent holes 10 disposed on the top frame 8, the exhaust port 23 exhausts the roaster 15, and the exhaust port 24 is a top plate. 9 The air inside the lower main body 1 is exhausted.

  As described above, in the present embodiment, all the intake and exhaust to and from the main body 1 are performed through the ventilation holes 10 arranged at the rear part on the top frame 8. The intake into the main body 1 may be performed not only from the vent hole 10 but also from the side surface of the main body 1 or the front part of the main body 1 above the roaster 15 or the operation panel 12.

  Reference numeral 25 denotes a bottom surface, which partitions the inside of the main body 1 up and down, on which the coil unit 2, the fan device 16 and the like are arranged, and below the roaster 15 and the like. Reference numeral 26 denotes a discharge port, which is an opening provided on the bottom surface 25 around the duct 17a.

  Reference numeral 27 denotes a display panel which is disposed below the front portion of the top plate 9 and displays a heat power adjustment amount of induction heating and the like, and a stable temperature is maintained by a cooling fan (not shown) provided below. Here, for cooling the display panel 27, for example, air inside the main body 1 may be used, or any configuration using lower-temperature air taken from the side surface or the front surface of the main body 1 to enhance the cooling performance may be used. More effective cooling.

  Reference numeral 28 denotes cooling air, which is air blown from the fan device 16 through the connection duct 20 and blown out from the plurality of openings 18 provided in the duct 17.

  Although not shown, electronic circuit components such as an inverter circuit board for controlling the induction heating coil 3 are mounted behind the operation panel 12 and below the bottom surface 25. For example, a cooling fan (see FIG. (Not shown). The air that has cooled the electronic circuit components is blown out from a discharge port 26 provided in a bottom surface 25 around the duct 17 into a space in which the coil unit 2a is arranged.

  Here, the configuration around the coil unit 2 will be described with reference to FIGS.

  The coil base 4 has a structure in which the ferrite 5 is disposed below the induction heating coil 3 for the purpose of concentrating the magnetic lines of force generated by the induction heating coil 3 on a cooking pan (not shown) above the top plate 9. Has become.

  In this embodiment, as an example, a plurality of rod-shaped ferrites 5 are radially mounted on the coil base 4 with respect to the induction heating coil 3, and as shown in FIG. There are a portion where the cooling air 28 blown out from the plurality of openings 18 provided directly collides with the induction heating coil 3 and a portion where the cooling air 28 collides with the coil base 4 on which the ferrite 5 is mounted as shown in FIG.

  In the portion of the coil unit 2 shown in FIG. 2A, the cooling air 28 blown out from the plurality of openings 18 provided in the duct 17 directly collides with the surface of the induction heating coil 3 almost perpendicularly. The heat can be efficiently radiated by high convection heat transfer, and the cooling air 28 having the same temperature can be supplied to the surface of the induction heating coil 3, so that the temperature distribution in the induction heating coil 3 can be reduced to achieve highly reliable cooling. .

  In the portion of the coil unit 2 shown in FIG. 2 (b), the cooling air 28 blown out from the plurality of openings 18 substantially perpendicularly collides with the ferrite 5 portion, and is transmitted from the induction heating coil 3 to the ferrite 5 by heat conduction. Heat can be efficiently cooled.

  In the cooling by the collision of air, the surface heat transfer of the collision surface (for example, the surface of the induction heating coil 3 of the present embodiment) increases in correlation with the speed of the collision air.

  For this reason, high heat transfer performance can be obtained by blowing high-speed air from the opening 18 even with a small amount of air compared with the conventional cooling method, and the collision surface (the induction heating coil 3) can be efficiently formed with a small amount of air. , Ferrite 5 and coil base 4) can be cooled.

  The cooling air 28 that has cooled the coil base 4 on which the induction heating coil 3 and the ferrite 5 are mounted flows in the circumferential direction of the coil base 4, and cools the top plate 9, passes through the exhaust port 24 at the rear of the main body 1, and passes through the vent hole 10. Exhausted.

  In the induction heating cooker according to the present embodiment, there are three flows mainly for cooling the coil unit 2a, the coil unit 2b, and the electronic circuit components (not shown). Next, these three cooling flows will be described.

  Cooling of the coil unit 2a is performed by sucking low-temperature air from the intake port 22 at the rear of the main body 1 by the fan device 16a, blowing out cooling air 28 from the plurality of openings 18 through the duct 17a through the connection duct 20a, and lowering the coil unit 2a. Is made to collide with the cooling air 28.

  The cooling air 28 whose temperature has risen due to efficient heat exchange with the induction heating coil 3a and the coil base 4a of the coil unit 2a flows in the circumferential direction of the coil unit 2a, mainly flows along the lower surface of the top plate 9, and exhausts the rear part of the main body 1. The air is exhausted from the vent 10 through the port 24 to the outside.

  The cooling of the coil unit 2b is performed by sucking low-temperature air from the intake port 21 at the rear part of the main body 1 by the fan device 16b, passing through the connection duct 20b, passing through the duct 17b, and passing through a plurality of openings 18 (not shown) through the cooling air 28. And the cooling air 28 collides with the lower surface of the coil unit 2b.

  The cooling air 28 that has been efficiently heat-exchanged by the coil unit 2b flows mainly along the top plate 9, passes through the exhaust port 24 at the rear of the main body 1, and is exhausted to the outside from the vent hole 10.

  The electronic circuit components (not shown) are cooled by sucking low-temperature air from an intake port 22 at the rear of the main body 1 by a cooling fan (not shown) arranged below the rear portion of the main body 1 to cool the electronic circuit components (not shown). The air that has cooled is discharged from the discharge port 26 of the bottom surface 25 arranged near the duct 17a below the coil unit 2a.

  The air flowing out from the discharge port 26 flows mainly along the top plate 9, passes through the exhaust port 24 at the rear part of the main body 1, and is exhausted to the outside from the vent hole 10.

  Here, if a part of the air flowing along the top plate 9 passes through the gap between the top plate 9 and the induction heating coil 3 and assists the cooling of the induction heating coil 3, the induction heating coil 3 can be further reduced. It is possible to cool the induction heating coil 3 with a higher cooling performance if the cooling can be performed efficiently and a configuration is provided in which a separate fan device 16 is provided to force the air to flow.

  Next, in the above configuration, the operation at the time of induction heating cooking when a cooking pot (not shown) is arranged on the right cooking pot placing portion 11a on the top plate 9 with reference to FIGS. explain.

  For example, to heat a cooking pot (not shown) containing an object to be heated such as water, the cooking pot (not shown) is placed on the cooking pot mounting portion 11a on the top plate 9 and provided on the front surface of the main body 1. By turning on the main power supply 13 of the operation panel 12 and turning the heating power adjustment dial 14 corresponding to the cooking pot mounting portion 11a, the display panel 27 arranged below the front portion of the top plate 9 displays the heating power. The adjustment amount is displayed.

  When the cooking pot (not shown) is heated by adjusting the rotation amount of the dial 14, the amount of current flowing through the induction heating coil 3a is controlled in accordance with the adjustment amount, and the heating of the cooking pot (not shown) is performed. Is started.

  In addition, a current flows through the induction heating coil 3a, and the fan device 16a (not shown) operates to draw air from the air inlet 22 located below the vent hole 10 on the top frame 8, and through the connection duct 20a. The air is supplied to the duct 17a below the coil unit 2a.

  The air that has entered the duct 17a is blown out from the plurality of openings 18 provided on the coil unit 2a side toward the induction heating coil 3a and the coil unit 2a, and serves as cooling air 28 to cool the induction heating coil 3a and the like.

  After colliding with the coil unit 2a, the cooling air 28 flows in the circumferential direction, travels mainly along the top plate 9 from the front part to the rear part of the main body 1, passes through the exhaust port 62 to the outside from the ventilation hole 10. Exhausted.

  Further, when heating of the cooking pot (not shown) by the induction heating coil 3a is started, in order to efficiently heat the cooking pot (not shown), an electronic circuit component for supplying a current to the induction heating coil 3a ( (Not shown) is activated. At this time, since the electronic circuit components (not shown) mounted below the bottom surface 25 generate heat and rise in temperature, in order to ensure reliability, a cooling fan (see FIG. (Not shown) starts working.

  This cooling fan (not shown) draws in low-temperature air from the intake port 22 in the same manner as the fan device 16a, and allows air to flow from the rear side to the front side of the main body 1 so that the electronic circuit components (not shown). To cool.

  The air that has cooled the electronic circuit components (not shown) flows from the discharge port 26 provided above the air passage to the vicinity of the coil unit 2a, and together with the cooling air 28 blown out from the opening 18 provided in the duct 17a. The main body 1 flows from the front side to the rear side along the top plate 9.

  Part of the air flowing near the top plate 9 passes through the gap between the top plate 9 and the induction heating coil 3a, cools the induction heating coil 3a, and is exhausted to the outside from the ventilation hole 10 through the exhaust port 24. You.

  Here, the fan device 16a and the cooling fan (not shown) measure the temperature of the induction heating coil 3a and the electronic circuit component (not shown) or the ambient air temperature, and turn on based on the measured temperature. / OFF control, or a configuration in which the air volume is adjusted by intermittent operation or fan speed control.

  The cooking pot (not shown) on the top plate 9 is monitored by a temperature sensor 6a disposed at the center of the coil unit 2a, for example, to prevent overheating during the heating operation and to prevent burns at the end of heating. Used for

  Further, for example, even when a cooking pot (not shown) is placed on the two cooking pot placement sections 11a and 11b and heated at the same time, the induction heating coils 3a and 3b are both cooled by the same cooling method. Needless to say, in an induction heating cooker in which cooling can be performed and input powers of the two induction heating coils 3a and 3b are different, only the induction heating coil 3a or 3b having a large input power can be applied.

(Second embodiment)
FIG. 3 is a side sectional view of the periphery of the coil unit 2 of the second embodiment.

  In the present embodiment, a ventilation hole through which a part of the cooling air 28 blown out from the plurality of openings 18 provided in the duct 17 disposed below the coil unit 2 is provided at the center of the coil unit 2 in the first embodiment. 29 is provided.

  Therefore, a part of the cooling air 28 blown out from the duct 17 cools the lower surface of the induction heating coil 3 by a flow colliding from below the coil unit 2 with the induction heating coil 3, and another part passes through the ventilation hole 29. As a result, a radial flow 30 passing through a gap between the lower surface of the top plate 9 and the upper surface of the induction heating coil 3 is formed, so that the upper surface side of the induction heating coil 3 can be cooled.

(Third embodiment)
Next, FIG. 4 shows a side sectional view of the periphery of the coil unit 2 of the third embodiment.

  In this embodiment, the induction heating coil 3 mounted on the coil base 4 is divided in the radial direction (the outer coil 3-1 and the inner coil 3-2 in the figure) to provide at least one coil gap 31. , A part of the cooling air 28 flowing from below the coil unit 2 through the coil gap 31.

  Therefore, similarly to the second embodiment, the lower surface of the induction heating coil 20 is cooled by colliding a part of the cooling air 28 ejected from the plurality of openings 18 provided in the duct 17 with the lower surface of the coil unit 2, Another part of the cooling air 28 passes through the coil gap 31 of the induction heating coil 3 to form a flow 30 passing through the gap between the lower surface of the top plate 9 and the upper surface of the induction heating coil 3, and the upper surface side of the induction heating coil 3 Can be cooled.

  Here, in the embodiment shown in FIGS. 3 and 4, the air from one fan device 16 is distributed to the upper and lower surfaces of the induction heating coil 3 via the duct 17 and flows therethrough. 16 and the duct 17 are separately provided, and the flow 30 in the gap between the lower surface of the top plate 9 and the upper surface of the induction heating coil 3 is made to flow in a different system. Since the air flow 30 can flow through the gap on the upper surface, high cooling performance can be obtained.

  In these embodiments, since the cooling air can be forced to flow also on the upper surface of the induction heating coil 3, the coil unit 2 is cooled by the porous jet impingement cooling on the lower surface of the induction heating coil 3 and the convection cooling on the upper surface of the induction heating coil 3. The cooling air can be efficiently supplied from both sides to lower the temperature of the induction heating coil 3 efficiently.

(Fourth embodiment)
FIG. 5 shows a side sectional view of the duct 17 of the fourth embodiment.

  The duct 17 shown in FIG. 5 has a configuration in which a cylindrical nozzle 32 is provided in the opening 18 that is supplied from the fan device 16 and blows out the cooling air 28 toward the lower surface of the coil unit 2 disposed above the duct 17.

  Here, as shown in this embodiment, the nozzle 32 is provided by adjusting the height of the nozzle in accordance with the unevenness due to the presence or absence of the ferrite 5 on the lower surface of the coil base 4 arranged above, so that the coil base is positioned from the upper end of the nozzle 32. By controlling the interval up to 4, cooling with good thermal efficiency can be performed.

  For example, considering the heat transfer performance in the impinging flow of air and the mounting of the main body 1, if the inner diameter of the nozzle 32 is 3 to 10 mm, the height of the nozzle 32 can be set to 5 to 50 mm.

  As described above, according to the embodiment shown in FIGS. 1 to 5, the induction heating coil 3 can be efficiently cooled. Therefore, the temperature rise of the induction heating coil 3 is reduced, and the reliability of the induction heating coil 3 can be increased. In addition, since the cooling can be performed with a small amount of air, noise can be reduced.

  In addition, since the hole diameter of the opening 18 is set to 3 to 10 mm, it is possible to configure an opening having a small air path loss and good thermal efficiency.

1 is an exploded perspective view of a part of an induction heating cooker according to a first embodiment of the present invention. FIG. 4A is a side cross-sectional view of the periphery of the coil unit of the induction heating cooker, FIG. 4A is a side cross-sectional view of the periphery of the coil unit including a coil base cut at a portion where no ferrite is mounted, and FIG. FIG. 4 is a side cross-sectional view of a peripheral portion of a coil unit including a coil base cut at a cut portion. It is a side sectional view of a coil unit peripheral part of a 2nd example of the present invention. It is a side sectional view of a coil unit peripheral part of a 3rd example of the present invention. It is a side sectional view of the duct of the 4th example of the present invention.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Main body 2 (2a, 2b) Coil unit 3 (3a, 3b) Induction heating coil 4 (4a, 4b) Coil base 8 Top frame 9 Top plate 16 (16a, 16b) Fan device 17 (17a, 17b) Duct 18 Opening 28 cooling air 29 vent hole 30 flow 31 gap

Claims (1)

A top plate (9) provided on a top frame (8) on the upper surface of the main body (1), and at least an induction heating coil (3) provided below the top plate (9) and the induction heating coil (3) are placed. A coil unit (2) composed of a coil base (4), a fan device (16) provided inside the main body (1), and air blown by the fan device (16). ), A plurality of openings (18) having a hole diameter of 3 to 10 mm are provided on the upper surface of the duct (17) located below the coil unit (2). An induction heating cooker characterized in that cooling air (28) is blown out from a plurality of openings (18) to collide with a lower surface of the coil unit (2).

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