JP4178026B2 - Induction heating cooker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cooling structure for an induction heating coil of an induction heating cooker.
[0002]
[Prior art]
An induction heating cooker, for example, an induction heating type cooking heater (hereinafter referred to as IH cooking heater), an eddy current is generated in a cooking pan disposed above the induction heating coil due to a magnetic line generated mainly by a current flowing through the induction heating coil. It itself generates heat.
[0003]
Although the induction heating cooker has a higher thermal efficiency (about 90% for iron pans) than the thermal efficiency of gas heating (about 40%), heat loss occurs and induction heating coils generate heat. Needed.
[0004]
In an induction heating cooker, in order to obtain the highest heating power required for cooking, it is necessary to increase the amount of eddy current flowing through the cooking pan, that is, increase the input power, but for example, a non-magnetic cooking pan that is difficult to heat And in a multi-layered pan, the thermal efficiency (for example, 70% or less) is significantly lower than that of an iron pan or the like, and a large input power is required to generate a heating amount necessary for cooking.
[0005]
However, under conditions of low thermal efficiency for high power input, heat loss (electric power that does not heat the cooking pan) increases and heat generation of parts such as induction heating coils increases. Since the allowable temperature is exceeded, a cooling structure that suppresses the allowable temperature or less is required.
[0006]
The cooling structure in the conventional induction heating cooker has a structure in which cooling air is supplied from the fan device to the vicinity of the induction heating coil and the coil base on which the induction heating coil is placed, and is disclosed in Patent Document 1. In the example, in order to cool 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 can be configured between the induction heating coil and the coil base. 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.
[0007]
In the example disclosed in Patent Document 2, a structure is described 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. .
[0008]
[Patent Document 1]
JP 2002-43045 A [Patent Document 2]
JP 2002-33184 A.
[0009]
[Problems to be solved by the invention]
In the induction heating cooker that supplies cooling air to the vicinity of the induction heating coil and the induction heating cooker that blows cooling air to the induction heating coil by providing a large opening below the induction heating coil, which is a conventional configuration, the induction heating coil surface Therefore, the induction heating coil having a large heat loss cannot be sufficiently cooled.
[0010]
Moreover, the coil base surface on which the induction heating coil is placed 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 is likely to change, and the heating stability is not good.
[0011]
In addition, there is a problem that temperature non-uniformity tends to occur in the direction in which the cooling air flows to the induction heating coil.
[0012]
The present invention has been made to solve at least one of the above problems.
[0013]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention includes a top plate provided on a top frame on the upper surface of a main body, an induction heating coil provided below the top plate, and a coil base on which the induction heating coil is placed. In an induction heating cooker comprising a coil unit configured and a fan device provided inside the main body and supplying cooling air to the coil unit, a high heat conductive member is provided in a gap between the top plate and the induction heating coil. the arranged thermal contact with the said induction heating coil, a plurality of irregularities on the upper surface of the high thermal conductivity member, said plurality of irregularities, the lower the flat, forming a plurality of projections thereon The plurality of concave and convex gaps are used as the cooling air flow path.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
As described above, the present invention provides a coil comprising a top plate provided on the top frame on the upper surface of the 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 placed. In an induction heating cooker provided with a unit and a fan device that is provided inside the main body and supplies cooling air to the coil unit, a high thermal conductivity member is introduced into the gap between the top plate and the induction heating coil. thermal contact was placed on the coil, a plurality of irregularities on the upper surface of the high thermal conductivity member, those wherein a plurality of irregularities, the lower the flat, and configured by forming a plurality of projections thereon The clearance gap between the plurality of projections and depressions is used as an air path for the cooling air, so that the induction heating coil can be efficiently cooled and its reliability can be improved.
[0021]
【Example】
Hereinafter, actual施例a reference example of the present invention will be described with reference to FIG. In FIG. 2 and subsequent figures, a part of the configuration common to the embodiment of FIG. 1 is omitted, and a redundant description is omitted. The same reference numerals in the drawings of Examples and Reference Examples indicate the same or equivalent. In addition, if there are two or more of the same thing and it is easier to understand by discriminating between them, the suffixes such as a, b, and c are added to the numerals of the parts that do not appear in the figure, etc. In the case of the above, the suffix is not added.
[0022]
It shows a exploded perspective view of a portion of the induction heating cooker of the real施例of the present invention in FIG. As an example of the induction heating cooker of the present invention, FIG. 1 shows a built-in type in which a cooking pan mounting portion by induction heating is provided in two fronts and right sides, and a cooking pan mounting portion by electric heater heating is provided in the center of the back. System kitchen integrated type) applied to IH cooking heater.
[0023]
Here, it is needless to say that the present invention can be easily applied not only to the built-in type but also to the stationary type (arranged as it is on the sink) as long as it is an IH cooking heater provided with at least one cooking pan placing part by induction heating.
[0024]
(First reference example)
Figure 2 is a side sectional view of the coil unit the periphery of the induction heating cooker is a diagram showing the relationship between the detailed structure of the coil unit and the flow of cooling air, or less, for the first reference example, FIG. 1 And it demonstrates using FIG. 2A 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. 2B includes a coil base cut at a portion where ferrite is mounted. It is side surface sectional drawing of a coil unit periphery part.
[0025]
In FIG. 1, 1 is a main body of the induction heating cooker. 2 (2a, 2b) is a coil unit, and there are two sets corresponding to induction heating of two necks, and is composed of the following six elements.
[0026]
3 (3a, 3b) are two induction heating coils, and an eddy current is generated in a cooking pan (not shown) placed above by magnetic lines generated by the current flowing therethrough, and the cooking pan (not shown). ) Heat itself. Reference numerals 4 (4a, 4b) are two coil bases, on which the induction heating coil 3 (3a, 3b) is placed and held.
[0027]
Reference numeral 5 (5a, 5b) is ferrite, and there are two pairs. One set is composed of several rods, and the coil base 4 (4a, 4b) is radially formed with respect to the induction heating coil 3 (3a, 3b). The magnetic field lines generated from the induction heating coil 3 (3a, 3b) are stopped from flowing downward. 6 (6a, 6b) are two temperature sensors, which are arranged in the center of the coil unit 2 (2a, 2b) and monitor the temperature of the upper cooking pan (not shown).
[0028]
The coil unit 2 (2a, 2b) includes an induction heating coil 3 (3a, 3b), a coil base 4 (4a, 4b), a ferrite 5 (5a, 5b), a temperature sensor 6 (6a, 6b), and high heat described later. It consists of a conductive member 17 (17a, 17b) and a heat conductive member 18 (18a, 18b) which will be described later.
[0029]
Reference numeral 7 denotes a radiant heater, which corresponds to a single electric heater.
[0030]
A top frame 8 is provided on the upper surface of the main body 1 and is composed of the following two elements. Reference numeral 9 denotes a top plate on which a cooking pan (not shown) formed of heat-resistant glass or the like and heated is placed. A ventilation hole 10 is provided at the rear portion on the top frame 8 and allows air to enter and exit between the inside and the outside of the main body 1. The top frame 8 is composed of the top plate 9 and the vent hole 10.
[0031]
Reference numeral 11 (11a, 11b, 11c) denotes a cooking pot placing portion, which indicates a part on which the cooking pot (not shown) is placed on the top plate 9, and 11a, 11b correspond to the two induction heating coils 3a, 3b. However, 11c is arrange | positioned at the front right and the left, and it corresponds to the radiant heater 7, and is arrange | positioned in the back substantially center.
[0032]
An operation panel 12 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. A main power source 13 is disposed in the operation panel 12 and turns on / off the entire device. Reference numeral 14 denotes a dial which is disposed in the operation panel 12 and can adjust the heating power by rotating. A roaster 15 is provided on the front surface of the main body 1 and grills fish.
[0033]
Reference numeral 16 (16a, 16b) denotes a fan device, and 16a is not shown, but is mounted on the rear side of the operation panel 27 and below the bottom surface 25 described later, and an electronic circuit component such as an inverter circuit board for controlling the induction heating coil 3 Air for cooling (not shown) is blown, and 16b is provided at a substantially central portion of the display panel 27 described later, and air for cooling the left coil unit 2b, that is, the induction heating coil 3b, is blown simultaneously. Cool down. The cooling air blown to the electronic circuit component (not shown) by the fan device 16a is then blown to the right coil unit 2a, that is, the induction heating coil 3a through the discharge port 26 provided on the bottom surface 25 described later. It is done.
[0034]
Here, the fan device 16 may be, for example, a propeller fan or a sirocco fan, but the fan device 16b is preferably large enough to be accommodated in a space between the bottom surface 25 and the top plate 9 as described later. .
[0035]
17 (17a, 17b) is a high thermal conductivity member, and there are two corresponding to the two induction heating coils 3 (3a, 3b), and induction heating is performed in the gap between the top plate 9 and the induction heating coil 3 (3a, 3b). The coil 3 (3a, 3b) is disposed in thermal contact.
[0036]
The high thermal conductivity member 17 is formed of a ceramic material obtained by sintering a high thermal conductivity powder, and the ceramic material may be, for example, alumina nitride or alumina, which can transmit magnetic lines of force and has good thermal conductivity. For example, a resin mixed with a high thermal conductive powder may be used.
[0037]
Further, it is desirable that the outer diameter dimension of the high thermal conductivity member 17 is larger than the outer diameter dimension of the induction heating coil 3 and is about 1 to 3 times the diameter of the induction heating coil 3. Reference numeral 17-1 (17a-1, 17b-1) denotes an exposed portion which is a portion protruding from the outer periphery of the induction heating coil 3 (3a, 3b) of the high thermal conductivity member 17 (17a, 17b). The thickness of the high thermal conductivity member 17 is preferably about 1 to 5 mm.
[0038]
More preferably, the size of the high thermal conductivity member 17 is about 1.2 to 1.5 times the diameter of the induction heating coil 3, and the thickness is about 2 to 3 mm. In the present embodiment, the high thermal conductivity member 17 is circular, but it goes without saying that it can be cooled most efficiently if it is exposed from the outer periphery of the induction heating coil 3 and has the maximum size that can be mounted in the main body 1.
[0039]
Reference numeral 18 (18a, 18b) denotes a heat conductive member, for example, a heat conductive grease, which is provided at two locations corresponding to the two induction heating coils 3 (3a, 3b), and has a high heat conductive member 17 (17a, 17b). ) And the induction heating coil 3 (3a, 3b) to facilitate heat conduction therebetween.
[0040]
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 and at least three locations for each coil base 4.
[0041]
20 (20a, 20b) is an elastic member, and there are two corresponding to the two induction heating coils 3 (3a, 3b), which are formed of a member having elasticity such as rubber, for example, and a high thermal conductivity member 17 (17a, 17b) and the top plate 9. Thereby, while avoiding the contact of the induction heating coil 3 (3a, 3b) and the top plate 9, the induction heating coil 3 and the high thermal conductivity member 17 are pressed together by the elastic force of the elastic member 20 and the support portion 19, The heat conduction member 18 interposed therebetween is thinned to improve heat conduction.
[0042]
An exhaust port 21 is disposed on the left side of the rear portion of the main body 1 at a position corresponding to the lower side of the vent hole 10 disposed on the top frame 8, and exhausts air inside the main body 1 below the top plate 9. An air inlet 22 is disposed on the right side of the rear portion of the main body 1 at a position corresponding to the lower side of the vent hole 10 disposed on the top frame 8 and is used for a fan device 16a (not shown) mounted below the bottom surface 25 described later. Inhale.
[0043]
23 and 24 are exhaust ports, which are disposed at 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 the top plate. 9 The air inside the lower body 1 is exhausted.
[0044]
Reference numeral 25 denotes a bottom surface that divides the inside of the main body 1 into upper and lower portions, on which the coil unit 2, the fan device 16b and the like are disposed, and below the roaster 15, the fan device 16a (not shown), and electronic circuit components (not shown). Etc. are arranged. Reference numeral 26 denotes a discharge port, which is an opening provided on the bottom surface 25 below the coil unit 2a.
[0045]
Reference numeral 27 denotes a display panel which is arranged below the front portion of the top plate 9 and displays a heating power adjustment amount of induction heating, etc., and is cooled by a fan device 16b provided at a substantially central portion of the display panel 27 to maintain a stable temperature. Keep it. Here, the cooling of the display panel 27 may use air inside the main body 1, for example, or if it is a configuration using lower temperature air sucked from the side surface or the front surface of the main body 1 in order to improve the cooling performance, More effective cooling.
[0046]
A cooling air 28 is supplied from the fan device 16 and cools the coil unit 2, the display panel 27, an electronic circuit component (not shown), and the like.
[0047]
Although not shown, an electronic circuit component such as an inverter circuit board for controlling the induction heating coil 3 is mounted on the rear side of the operation panel 27 and below the bottom surface 25, and a fan device 16 a (not shown) provided at the rear of the main body 1. The air is cooled by the cooling air 28 that blows. The cooling air 28 that has cooled the electronic circuit components is blown out from a discharge port 26 provided in the bottom surface 25 below the coil unit 2a into the space in which the coil unit 2a is disposed.
[0048]
Here, the configuration of the periphery of the coil unit 2 will be described with reference to FIGS. 2 (a) and 2 (b).
[0049]
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 field lines generated by the induction heating coil 3 in a cooking pan (not shown) above the top plate 9. It has become.
[0050]
In this reference example, as an example, a plurality of rod-like ferrites 5 are mounted radially in the coil base 4 with respect to the induction heating coil 3. As shown in FIG. There are a part that flows in the vicinity of the induction heating coil 3 and a part that flows in the vicinity of the coil base 4 on which the ferrite 5 is mounted as shown in FIG.
[0051]
The cooling air 28 exchanges heat with the induction heating coil 3 that generates heat, and the coil base 4, the ferrite 5, and the high thermal conductivity member 17 that are heated by heat conduction from the induction heating coil 3, and cools the top plate 9 while cooling the top plate 9. 1 flows to the rear, passes through the exhaust port 21 or the exhaust port 24, and is exhausted from the vent hole 10.
[0052]
In the induction cooking device of this reference example, there are two flows: a flow of cooling air 28 for cooling the electronic circuit components (not shown) and the coil unit 2a, and a flow of cooling air 28 for mainly cooling the coil unit 2b. These two cooling flows will now be described.
[0053]
First, in order to cool an electronic circuit component (not shown), the former flow is caused by a fan device 16a (not shown) mounted on the rear side of the operation panel 12 and below the bottom surface 25. Low-temperature air is sucked from the intake port 22.
[0054]
The fan device 16a (not shown) uses the low-temperature air sucked from the intake port 22 at the rear of the main body 1 as the cooling air 28, and blows air from the rear to the front of the main body 1 below the bottom surface 25, to the windward side. An electronic circuit component (not shown) is cooled.
[0055]
The cooling air 28 that has taken heat from the electronic circuit components (not shown) flows out from the discharge port 26 provided on the bottom surface 25 below the coil unit 2a to the space above the bottom surface 25. The cooling air 28 flowing out from the discharge port 26 flows in the vicinity of the coil unit 2a, and directly from the induction heating coil 3a or through the high heat conductive member 17a having a large heat transfer area, the coil base 4a, or the ferrite 5a. The heat is taken away and the induction heating coil 3a is cooled with high efficiency.
[0056]
Since the exposed portion 17a-1 of the high thermal conductivity member 17a is also cooled by the flow of the cooling air 28, the heat is taken away and the temperature is lowered, thereby cooling the induction heating coil 3a with higher efficiency.
[0057]
The cooling air 28 whose temperature has been increased by heat exchange in the coil unit 2a flows around the coil unit 2a, flows along the lower surface of the top plate 9, passes through the exhaust port 24 at the rear of the main body 1, and is exhausted from the vent hole 10.
[0058]
On the other hand, in the latter flow, the fan device 16b sucks air in the vicinity of the display panel 27 and cools the display panel 27, and blows out the cooling air 28 toward the coil unit 2b. The cooling air 28 blown out from the fan device 16b flows in the vicinity of the coil unit 2b and directly from the induction heating coil 3b or through the high heat conductive member 17b having a large heat transfer area, the coil base 4b, or the ferrite 5b. The heat is taken away and the induction heating coil 3b is cooled with high efficiency.
[0059]
Since the exposed portion 17b-1 of the high thermal conductivity member 17b is also cooled by the flow of the cooling air 28, the heat is deprived and the temperature is lowered, and the induction heating coil 3a is cooled with higher efficiency.
[0060]
The cooling air 28 whose temperature has risen due to heat exchange in the coil unit 2b flows around the coil unit 2b, flows along the lower surface of the top plate 9, passes through the exhaust port 21 or the exhaust port 24 at the rear of the main body 1, and is exhausted from the vent hole 10. Is done.
[0061]
Next, in the above configuration, with reference to FIG. 1 and FIG. 2, the operation at the time of induction heating cooking when a cooking pan (not shown) is arranged on the cooking pan mounting portion 11 a on the right side on the top plate 9. explain.
[0062]
For example, heating of a cooking pot (not shown) containing an object to be heated such as water is provided on the front surface of the main body 1 by placing the cooking pot (not shown) on the cooking pot mounting portion 11 a on the top plate 9. The main power source 13 of the operation panel 12 is turned on, and the heating power adjustment dial 14 corresponding to the cooking pan mounting portion 11a is rotated, so that the display panel 27 disposed below the front portion of the top plate 9 has its heating power. The adjustment amount is displayed.
[0063]
When the amount of rotation of the dial 14 is adjusted to heat the cooking pan (not shown), the amount of current flowing through the induction heating coil 3a is controlled according to the amount of adjustment, and the cooking pan (not shown) is heated. Is started.
[0064]
In addition, an electric current flows through the induction heating coil 3a, and a fan device 16a (not shown) is operated to suck in air from an intake port 22 located below the vent hole 10 on the top frame 8 to thereby generate an electronic circuit component (FIG. (Not shown) is supplied with cooling air 28.
[0065]
The cooling air 28 that has taken away the heat of the electronic circuit components (not shown) flows out from the discharge port 26 provided in the bottom surface 25 below the coil unit 2a into the space above the bottom surface 25. The cooling air 28 flowing out from the discharge port 26 flows in the vicinity of the coil unit 2a, and takes heat directly from the induction heating coil 3a or through the high thermal conductivity member 17a, the coil base 4a, or the ferrite 5a.
[0066]
Cooling air 28 whose temperature rises by heat exchange coil unit 2 a is evacuated flow body 1 the rear portion of the exhaust port 24 along the lower surface top plate 9 flows around the coil unit 2a from the street vents 10.
[0067]
Here, the fan device 16a (not shown) measures the temperature of the induction heating coil 3a and the electronic circuit component (not shown) or the ambient air temperature, and performs ON / OFF control based on the temperature. Alternatively, the air volume may be adjusted by intermittent operation or fan speed control.
[0068]
A cooking pan (not shown) on the top plate 9 is monitored by a temperature sensor 6a arranged at the center of the coil unit 2a. For example, for preventing overheating during heating operation, preventing burns at the end of heating, and the like. Used for.
[0069]
Further, for example, even when a cooking pan (not shown) is placed on the two cooking pan placing portions 11a and 11b at the same time and heated, the two induction heating coils 3a and 3b are respectively connected to the fan devices 16a and 16a, Since it can cool by b, it cannot be overemphasized that the temperature of the two induction heating coils 3a and 3b can be maintained simultaneously.
[0070]
( First embodiment)
FIG. 3 is a perspective view in which a part of the coil unit 2 of the first embodiment is broken.
[0071]
In this example, in the same configuration as the embodiment shown in the first reference example, a plurality of irregularities 29 are provided on the high thermal conductive member 17 arranged in the gap between the top plate 9 and the induction heating coil 3. is there. In the example shown in FIG. 3, the plurality of projections and depressions 29 are configured by forming a plurality of protrusions on the lower portion thereof in a planar shape.
[0072]
Since the gaps between the plurality of projections and depressions 29 provided in the high thermal conductivity member 17 are used as the air path of the cooling air 28 supplied by the fan device 16, heat exchange can be performed over a wide area of the high thermal conductivity member 17. The temperature can be further lowered as compared with the case where there is no.
[0073]
For this reason, the induction heating coil 3 disposed in thermal contact with the high heat conductive member 17 by the heat conductive member 18 such as heat conductive grease can be cooled with higher efficiency.
[0074]
The plurality of irregularities 29 is not limited to the above-described lower portion having a flat shape and a protrusion formed thereon, but the lower surface, that is, the surface in contact with the induction heating coil 3 is in a shape that is in close contact with the induction heating coil 3. It suffices for the upper portion to have a shape in which the cooling air 28 flows smoothly through the gap and has a large surface area.
[0075]
( Second reference example)
Next, FIG. 4 shows a side sectional view of the periphery of the coil unit 2 of the second reference example.
[0076]
In this reference example, a ventilation duct 30 is arranged below the coil unit 2 in the center of the coil base 4 of the coil unit 2 in the first reference example, and a ventilation hole 31 through which the cooling air 28 ejected from the ventilation duct 30 can pass is provided. This is a configuration provided.
[0077]
The cooling air 28 ejected from the ventilation duct 30 passes through the ventilation hole 31 to form a radial flow 32 passing through the gap between the top plate 9 and the high thermal conductivity member 17, and induction heating is performed via the high thermal conductivity member 17. The upper surface of the coil 3 can be cooled.
[0078]
Here, if the fan device 16 for supplying the cooling air 28 to the ventilation duct 30 is separately provided inside the main body 1, the air volume of the flow 32 flowing through the gap between the top plate 9 and the high thermal conductivity member 17 can be easily increased. It becomes possible to improve the cooling effect.
[0079]
Although not shown, even if the induction heating coil 3 is divided into a plurality of portions in the radial direction and is mounted on the coil base 4 with at least one gap, high thermal conductivity is provided according to the gap. A hole is provided in the member 17. For example, the cooling air 28 is similarly passed through the gap between the induction heating coil 3 and the hole of the high thermal conductivity member 17 by the ventilation duct 30, and flows through the gap between the top plate 9 and the high thermal conductivity member 17. By doing so, the upper surface of the induction heating coil 3 can be cooled via the high thermal conductivity member 17.
[0080]
Also in such an embodiment, since the cooling air 28 can be forced to flow to the lower surface of the induction heating coil 3, the induction heating coil 3 can be cooled from both sides, and the temperature of the induction heating coil 3 can be lowered more efficiently. be able to.
[0081]
( Third reference example)
Next, FIG. 5 shows a side sectional view of the periphery of the coil unit 2 of the third reference example.
[0082]
In this reference example, a duct 33 is provided below the coil base 4 of the coil unit 2 in the first reference example, and a fan device 16 that supplies cooling air 28 to the duct 33 is provided inside the main body 1, and is blown from the duct 33. This is a flow in which the jet-like cooling air 28 is collided with the exposed portion 17-1 of the high thermal conductivity member 17, the lower surface of the coil base 4, and the like.
[0083]
A plurality of openings 34 are provided on the upper surface of the duct 33 corresponding to the coil base 4, and a plurality of nozzles 35 are provided on the outer periphery corresponding to the exposed portion 17-1 of the high thermal conductivity member 17.
[0084]
Cooling air 28 ejected from a plurality of openings 34 provided on the upper surface of the duct 33 collides with the lower surface of the induction heating coil 3 and the lower surface of the coil base 4, flows in the circumferential direction, flows around the coil unit 2, and flows into the top plate. 9 Flows along the bottom surface, passes through the exhaust port 21 or the exhaust port 24 at the rear of the main body 1, and is exhausted from the vent hole 10.
[0085]
Cooling air 28 ejected from a plurality of nozzles 35 provided on the outer periphery of the upper surface of the duct 33 collides with the lower surface of the exposed portion 17-1 of the high thermal conductivity member 17, flows around the coil unit 2, and flows on the lower surface of the top plate 9. The air is exhausted from the vent hole 10 through the exhaust port 21 or the exhaust port 24 at the rear of the main body 1.
[0086]
Therefore, the induction heating coil 3 is directly cooled by the cooling air 28 blown from the opening 34 on the upper surface of the duct 33 on the lower surface side, and the outer peripheral portion of the high thermal conductivity member 17 by the cooling air 28 blown from the nozzle 35 on the outer periphery of the upper surface of the duct 33. Cooling indirectly through the exposed portion 17-1. That is, the induction heating coil 3 can be efficiently cooled from both sides.
[0087]
In addition, since the cooling air 28 can be directly collided with the high thermal conductivity member 17 to perform cooling with good heat transfer, the condition that the air volume of the cooling air 28 flowing through the gap between the high thermal conductivity member 17 and the top plate 9 is small. Alternatively, the induction heating coil 3 can be cooled even under conditions where it cannot flow.
[0088]
As long as the induction heating coil 3 can be sufficiently cooled, the duct 33 may have a structure in which only the opening 34 is provided without the nozzle 35, and the opening 34 is used to control the blowing air speed of the cooling air 28 from the opening 34. It may be a structure in which the size of is adjusted.
[0089]
( Fourth reference example)
Next, FIG. 6 shows a side sectional view of the periphery of the coil unit 2 of the fourth reference example.
[0090]
In this reference example, the coil unit 2 includes an induction heating coil 3, a coil base 4, a ferrite 5, a temperature sensor 6, and a high thermal conductivity member 36 having high thermal conductivity provided on the coil base 4. FIG. 6A is a side sectional view of the periphery of the coil unit including a coil base cut at a portion where no ferrite is mounted, and FIG. 6B includes a coil base cut at a portion where ferrite is mounted. It is side surface sectional drawing of a coil unit periphery part.
[0091]
The induction heating coil 3, the ferrite 5, and the temperature sensor 6 are the same as in the first reference example, but the configuration of the coil base 4 is different from that in the first reference example, and a high thermal conductivity member 36 is provided on the coil base 4. The induction heating coil 3 is provided with a part or all of the induction heating coil 3 in thermal contact with and placed on the high thermal conductivity member 36. The induction heating coil 3 is cooled by the cooling air 28 via the high thermal conductivity member 36. Is done.
[0092]
In the present reference example, as in the first reference example, as an example, a plurality of rod-like ferrites 5 are mounted radially in the coil base 4 with respect to the induction heating coil 3, and FIG. As shown in a), there are a portion where the cooling air 28 flows in the vicinity of the induction heating coil 3 and a portion where the cooling air 28 flows in the vicinity of the coil base 4 on which the ferrite 5 is mounted as shown in FIG.
[0093]
By providing the coil base 4 on which the induction heating coil 3 is placed with the high thermal conductivity member 36 having high thermal conductivity, the heat of the induction heating coil 3 is efficiently transferred to the high thermal conductivity member 36, and the induction heating coil 3. The temperature distribution in the radial direction can be relaxed.
[0094]
This reference example can be applied even when the gap between the induction heating coil 3 and the top plate 9 is small, and the induction heating coil 3 can be efficiently cooled.
[0095]
( Fifth reference example)
Next, FIG. 7 shows a side sectional view of the periphery of the coil unit 2 of the fifth reference example.
[0096]
This reference example has a structure in which a plurality of irregularities 29, for example, protrusions, are provided below the high thermal conductivity member 36 provided on the coil base 4 in the fourth reference example.
[0097]
Since the plurality of irregularities 29 are provided, the heat transfer area of the high thermal conductivity member 36 is expanded as compared with the case of the fourth reference example, and the induction heating coil 3 can be cooled more efficiently.
[0098]
Further, in the above reference example described, by combining the coil base 4 of the fourth or fifth reference example to the structure of the first embodiment or the first to third reference example, even more induction heating coil 3 Cool with high efficiency.
[0099]
【The invention's effect】
Thus, as mentioned, according to the induction heating cooker of the present invention, it can be cooled efficiently induction heating coil, to reduce the temperature distribution in the induction heating coil, the effect of increasing its reliability Can play. Therefore, cooling can be performed with a small amount of air, and noise can be reduced.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a part of an induction heating cooker according to a first embodiment of the present invention.
FIG. 2 is a side cross-sectional view of the periphery of the coil unit of the first reference example , wherein (a) is a side cross-sectional view of the periphery of the coil unit including a coil base cut at a portion not mounting ferrite; FIG. 5 is a side cross-sectional view of the periphery of a coil unit including a coil base cut at a site where ferrite is mounted.
FIG. 3 is a perspective view in which a part of the coil unit according to the first embodiment of the present invention is broken.
FIG. 4 is a side sectional view of the periphery of a coil unit of a second reference example.
FIG. 5 is a side cross-sectional view of the periphery of a coil unit of a third reference example.
6A is a side cross-sectional view of the periphery of the coil unit of the fourth reference example, and FIG. 6A 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; FIG. 5 is a side cross-sectional view of the periphery of a coil unit including a coil base cut at a site where ferrite is mounted.
FIG. 7 is a side sectional view of the periphery of a coil unit 2 of a fifth reference example.

Claims (1)

A coil unit comprising a top plate provided on a top frame on the upper surface of the main body, at least an induction heating coil and a coil base on which the induction heating coil is placed, provided below the top plate; In an induction heating cooker comprising a fan device for supplying cooling air to the coil unit,
Said top plate and induce high heat conductivity member into a gap between the heating coil thermal contact with the said induction heating coil is disposed, a plurality of irregularities on the upper surface of the high thermal conductivity member, said plurality of irregularities, An induction heating cooker characterized in that a lower part is formed in a planar shape and a plurality of protrusions are formed thereon, and the gaps between the plurality of projections and depressions serve as an air passage for the cooling air.

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