JP2007266009A - Induction heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an induction heating cooker efficiently cooling an induction heating coil and capable of realizing high reliability. <P>SOLUTION: The induction heating cooker is equipped with a top plate 9 provided on a top frame 8 of an upper surface of a main body 1, a coil unit 2 structured by at least an induction heating coil 3 provided on downward of the top plate 9 and a coil base 4 with the induction heating coil 3 mounted, a fan device 16 provided inside the body 1, and a duct 17 inducing air sent by the fan device 16 to the coil unit 2. A plurality of openings 18 are provided on an upper surface of the duct 17 placed at downward of the coil unit 2, and flow of porous collision jet stream is structured of collision by blowing off cooling air 28 from the plurality of openings 18 to a lower surface of the coil unit 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

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

  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.

  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.

  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.

  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.

  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.

  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. .

JP 2002-43045 A JP 2002-33184 A

  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 and ferrite with large heat loss cannot be sufficiently cooled.

  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.

  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.

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

  In order to solve the above-described problems, the present invention provides an induction heating cooker according to claim 1, wherein a top plate provided on the upper surface of the main body, an induction heating coil provided below the top plate, and the induction heating coil include: A coil base to be mounted, and a plurality of rod-shaped ferrites mounted in the coil base radially with respect to the induction heating coil and stopping the flow of magnetic lines generated from the induction heating coil downward. In an induction heating cooker comprising a coil unit to be operated, a fan device provided inside the main body, and a duct for guiding air blown from the fan device to the coil unit, the coil unit is located below the coil unit. A plurality of openings are provided on the upper surface of the duct, and cooling air blown from the plurality of openings is made to collide with the lower surface of the coil unit to cause a flow of the multi-hole collision jet To cool the back surface of more induction heating coils, and the cooling air blown out from the plurality of openings and cooling the heat transmitted by thermal conduction to the ferrite from the induction heating coil by colliding the ferrite.

  In addition, in the induction heating cooker according to claim 2, an eddy current is generated in the cooking plate placed above by a top plate on which the cooking pan to be heated is placed and a magnetic line generated by a flowing current, and the cooking is performed. An induction heating coil for generating heat in the pan itself, a coil base on which the induction heating coil is placed and held, and several rods are formed as a set, and the coil base is radiated with respect to the induction heating coil. And a coil unit including a ferrite unit that stops a flow of magnetic lines generated from the induction heating coil from flowing downward, the induction heating coil, the coil base, and the ferrite, and a lower part of the coil unit. A duct provided with a plurality of openings on the upper surface, and cooling air ejected substantially vertically from the plurality of openings so as to collide with the ferrite portion. The air that was decided to anda fan device impinging on the coil unit ejection from said plurality of apertures.

  According to the induction heating cooker of the present invention, in the induction heating cooker including the duct for guiding the air blown from the fan device to the coil unit, the induction heating coil and the ferrite are efficiently cooled with a low air volume. The temperature distribution in the induction heating coil can be reduced and the reliability can be improved. Since it can be cooled with a small air volume, it is possible to reduce noise.

  Embodiments of the present invention will be described below with reference to the drawings. 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 the embodiments 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.

(First embodiment)
FIG. 1 is an exploded perspective view of a part of the induction heating cooker according to the first embodiment of the present invention. As an example of the induction heating cooker of the present invention, FIG. 1 shows a built-in type (system) in which a cooking pan mounting part by induction heating is provided in two on the left and right, and a cooking pot mounting part by electric heater heating is provided in the back in the center. This is applied to a kitchen integrated type) IH cooking heater.

  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.

  FIG. 2 is a side 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 by the duct. Hereinafter, the first embodiment will be described with reference to FIG. 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.

  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 four elements.

  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.

  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).

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

  Reference numeral 7 denotes a radiant heater, which corresponds to a single electric heater.

  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.

  Reference numeral 11 (11a, 11b, 11c) denotes a cooking pot placing portion, which indicates a portion 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. And 11c corresponds to the radiant heater 7 and is arranged at the center of the back.

  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 and the like.

  Reference numeral 16 (16a, 16b) is a fan device, and there are two corresponding to the two sets of coil units 2 (2a, 2b), and blows air for cooling the induction heating coils 3 (3a, 3b). Here, the fan device 16 may be, for example, a propeller fan or a sirocco fan. However, as shown in the present embodiment, the fan device 16 is preferably large enough to be accommodated in a space between the bottom surface 25 and the top plate 9 described later.

  17 (17a, 17b) are two ducts corresponding to the two sets of coil units 2 (2a, 2b), provided below the coil units 2 (2a, 2b), and having a plurality of openings 18 on the upper surface. Provided. The duct 17 has a substantially circular shape and is connected to the fan device 16 disposed upstream thereof. The air blown by the fan device 16 is ejected from the plurality of openings 18 to collide with the lower surface of the coil unit 2. In the present embodiment, the openings 18 are circular and staggered. However, the openings 18 may be elliptical or polygonal, or may be arranged in a grid or a radial pattern. The size, number and arrangement of the openings 18 change the amount of air supplied by the fan device 16 in conjunction with the air path loss. For example, if the holes 18 are arranged with a hole diameter of 3 to 10 mm and a hole interval of 10 to 40 mm, The opening 18 with small path loss and good thermal efficiency can be configured.

  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. The support portion 19 may be any structure that presses the coil unit 2 against the top plate 9 or a structure that can be in close contact with the top plate 9.

  20 (20a, 20b) is a connection duct, and there are two corresponding to the two sets of coil units 2 (2a, 2b), and connects the fan device 16 (16a, 16b) and the duct 17 (17a, 17b). . In addition, the distance L between the fan device 16 and the duct 17, that is, the length of the connecting duct 20, takes into account the air flow resistance, fan noise, and the body 1 mounting, etc. Cooling air can be supplied to the coil unit 2 under fewer conditions.

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

  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.

  As described above, in this embodiment, the intake and exhaust to and from the inside and outside of the main body 1 are all performed through the vent hole 10 disposed in the rear portion on the top frame 8. The air 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 from the front surface of the main body 1 above the roaster 15 or the operation panel 12.

  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 16 and the like are disposed, and the roaster 15 and the like are disposed below. Reference numeral 26 denotes a discharge port, which is an opening provided in the bottom surface 25 around the duct 17a.

  A display panel 27 is disposed below the front portion of the top plate 9 and displays a heating power adjustment amount of induction heating and the like, and a stable temperature is maintained by a cooling fan (not shown) provided below. 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.

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

  Although not shown, an electronic circuit component such as an inverter circuit board for controlling the induction heating coil 3 is 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 the discharge port 26 provided in the bottom surface 25 around the duct 17 to the space where the coil unit 2a is disposed.

  Here, the configuration of the periphery of the coil unit 2 will be described with reference to FIGS. 2 (a) and 2 (b).

  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.

  In this embodiment, 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 as shown in FIG. There are a portion where the cooling air 28 ejected from the plurality of openings 18 directly collides with the induction heating coil 3 and a portion where it collides with the coil base 4 on which the ferrite 5 is mounted as shown in FIG.

  The portion of the coil unit 2 shown in FIG. 2A is such that the cooling air 28 ejected from the plurality of openings 18 provided in the duct 17 directly collides with the induction heating coil 3 surface substantially perpendicularly. The heat generation can be efficiently dissipated by high convection heat transfer, and the cooling air 28 having the same temperature can be supplied in the direction of the surface of the induction heating coil 3. it can.

  2 (b), the cooling air 28 ejected substantially vertically from the plurality of openings 18 collides with the ferrite 5 portion, so that it is transmitted from the induction heating coil 3 to the ferrite 5 by heat conduction. Heat can be efficiently cooled.

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

  For this reason, compared with the conventional cooling method, high heat transfer performance can be obtained by blowing high-speed air from the opening 18 even with a small air flow, and the collision surface (induction heating coil 3) can be efficiently produced with a low air flow. The ferrite 5 and the 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, passes through the exhaust port 24 at the rear of the main body 1 and cools the top plate 9 from the vent hole 10. Exhausted.

  In the induction heating cooker of 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), and these three cooling flows will be described next.

  The 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, and blowing out the cooling air 28 from the plurality of openings 18 through the duct 17a through the connection duct 20a. The cooling air 28 is made to collide with.

  The cooling air 28 that has been heated efficiently by exchanging heat 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, flows mainly along the lower surface of the top plate 9, and exhausts at the rear of the main body 1. The air is exhausted from the vent hole 10 through the opening 24.

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

  The cooling air 28 efficiently exchanged heat 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 the intake port 22 at the rear of the main body 1 by a cooling fan (not shown) disposed below the rear of the main body 1. The air that has cooled the air flows out from the discharge port 26 of the bottom surface 25 disposed 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 of the main body 1, and is exhausted to the outside through 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 to assist the cooling of the induction heating coil 3, the induction heating coil 3 can be further made. The induction heating coil 3 can be cooled with higher cooling performance if it can be efficiently cooled, and if a separate fan device 16 is provided to force air to flow.

  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.

  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.

  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.

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

  The air that has entered the duct 17a is ejected 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 becomes cooling air 28 to cool the induction heating coil 3a and the like.

  The cooling air 28 collides with the coil unit 2a and then flows in the circumferential direction, proceeds mainly along the top plate 9 from the front part of the main body 1 toward the rear part, passes through the exhaust port 62, and passes from the vent hole 10 to the outside. Exhausted.

  In addition, when heating of the cooking pan (not shown) by the induction heating coil 3a is started, an electronic circuit component that supplies an electric current to the induction heating coil 3a in order to efficiently heat the cooking pan (not shown) ( Operates (not shown). At this time, the electronic circuit component (not shown) mounted below the bottom surface 25 generates heat and the temperature rises. Therefore, in order to ensure reliability, a cooling fan (see FIG. (Not shown) begins to operate.

  This cooling fan (not shown) sucks in low-temperature air from the intake port 22 in the same manner as the fan device 16a, and causes the air to flow from the rear side to the front side of the main body 1, whereby the electronic circuit component (not shown). Cool down.

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

  Part of the air that flows in the vicinity of 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 then is exhausted to the outside through the vent hole 10 through the exhaust port 24. The

  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 temperature. / OFF control may be used, or the air volume may be adjusted by intermittent operation or fan speed control.

  A cooking pan (not shown) on the top plate 9 is monitored by a temperature sensor 6a disposed in 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.

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

(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 ejected from a plurality of openings 18 provided in the duct 17 disposed below the coil unit 2 can pass through the central portion of the coil unit 2 in the first embodiment. 29 is provided.

  Therefore, a part of the cooling air 28 ejected from the duct 17 cools the lower surface of the induction heating coil 3 by a flow colliding with the induction heating coil 3 from below the coil unit 2, and the other part passes through the vent hole 29. Thus, a radial 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 can be formed, and 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 placed on the coil base 4 is divided in the radial direction (in the drawing, the outer coil 3-1 and the inner coil 3-2), and at least one coil gap 31 is provided. A part of the cooling air 28 flowing from below the coil unit 2 can pass through the coil gap 31.

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

  Here, in the embodiment shown in FIG. 3 and FIG. 4, the air from one fan device 16 is distributed and flows to the upper and lower surfaces of the induction heating coil 3 through the duct 17. 16 and the duct 17 are provided separately, and if the flow 30 in the gap between the bottom surface of the top plate 9 and the top surface of the induction heating coil 3 is a separate flow, the bottom surface of the top plate 9 and the induction heating coil 3 are increased at higher wind speeds. Since the air flow 30 can flow through the gap between the upper surfaces, 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 obtained by the perforated 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 supplied from both sides of the heater to efficiently reduce the temperature of the induction heating coil 3.

(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 facing the lower surface of the coil unit 2 disposed above the duct 17 is provided in the opening 18 that is supplied from the fan device 16 and blows out the cooling air 28.

  Here, as shown in the present embodiment, the nozzle 32 is provided by adjusting the nozzle height according to the unevenness due to the presence or absence of the ferrite 5 on the lower surface of the coil base 4 disposed above, so that the coil base extends from the upper end of the nozzle 32. Cooling with good thermal efficiency can be achieved by controlling the interval up to 4.

  For example, if the inner diameter of the nozzle 32 is φ3 to 10 mm in consideration of the heat transfer performance in the air collision flow and the mounting of the main body 1, the nozzle 32 can be arranged at a height of 5 to 50 mm.

(Fifth embodiment)
As a fifth embodiment, as shown in FIG. 6, the inner wall surface between the upper end surface 33 and the lower end surface 34 of the opening 18 is inclined or rounded to reduce the flow resistance when the cooling air 28 is blown out. Thus, the amount of cooling air supplied from the fan device 16 can be increased, and high cooling performance can be realized.

  Here, the flow resistance can be reduced even if the inner wall surface between the upper end surface 33 and the lower end surface 34 of the opening 18 has an arc shape, and it can be applied regardless of the shape regardless of whether the opening 18 is circular or slit. Thus, the amount of cooling air can be increased.

(Sixth embodiment)
Further, as a sixth embodiment, as shown in FIG. 7, a configuration in which the wall surface of the duct 17 is inclined so that the cooling air 28 blown out from the duct 17 is uniformly blown, for example, the bottom wall surface is deep in the central portion and the peripheral portion. However, the inner pressure of the duct 17 may be adjusted by using a shallow conical shape or a spherical shape.

(Seventh embodiment)
Further, as a seventh embodiment, as shown in FIG. 8, the hole diameter of the opening 18 of the duct 17 is made smaller toward the outer periphery in the radial direction of the induction heating coil 3 to adjust the wind speed of the cooling air 28 ejected from the opening 18. If it is set as the structure to perform, the coil unit 2 lower surface can be cooled uniformly.

  Even in the configurations shown in FIGS. 5 and 6, the same effects can be superimposed by applying the configurations in FIGS. 7 and 8 in the same manner.

(Eighth embodiment)
FIG. 9 shows a perspective view of the coil unit 2 of the eighth embodiment.

  In this embodiment, for example, the upper wall surface 35 of the duct 17 provided with a plurality of openings 18 is made of ferrite, and the flow of magnetic lines of force directed downward of the induction heating coil 3 is stopped by the ferrite upper wall surface 35. .

  Therefore, for example, the rod-shaped ferrite 5 shown in FIG. 2B is not arranged on the rib 38 that connects the inner frame 36 and the outer frame 37 of the coil base 4, so that the induction heating coil 3 is mainly placed. It is supported by the inner frame 36 and the rib 38.

  In this embodiment, since the ferrite for stopping the flow of the magnetic field lines is configured as the upper wall surface 35 of the duct 17 provided below the coil unit 2, the rib 38 of the coil base 4 is configured by a plurality of thin members. The cooling air 28 ejected from the plurality of openings 18 provided in 17 can be directly collided with the induction heating coil 3 in a wider area, and the induction heating coil 3 can be cooled with high thermal efficiency.

  Further, by configuring the ferrite as the upper wall surface 35 of the duct 17 and disposing it all over the coil base 4, the flow of magnetic lines of force directed downward of the induction heating coil 3 can be stopped, and an upper cooking pan (not shown) Induction heating can be further promoted to improve heating efficiency.

  Here, the upper wall surface 35 may have a configuration in which divided plate materials are combined instead of a single plate, or a nozzle 32 may be provided as shown in FIG. 5, or a flow loss may be caused as shown in FIG. If the configuration is reduced, the cooling air can be efficiently cooled by increasing the air volume of the cooling air.

  As mentioned above, according to the Example shown in FIGS. 1-7, the induction heating coil 3 can be cooled efficiently. Therefore, the temperature rise of the induction heating coil 3 is reduced, the reliability of the induction heating coil 3 can be increased, and the noise can be reduced because the induction heating coil 3 can be cooled with a small amount of air.

It is the perspective view which decomposed | disassembled some induction heating cooking appliances of a 1st Example. It is side surface sectional drawing of the coil unit periphery part of the induction heating cooking appliance, (a) is side surface sectional drawing of the coil unit periphery part including the coil base cut | disconnected in the site | part which does not mount a ferrite, (b) mounts a ferrite It is side surface sectional drawing of the coil unit periphery part containing the coil base cut | disconnected by the site | part which carried out. It is side surface sectional drawing of the coil unit periphery part of a 2nd Example. It is side surface sectional drawing of the coil unit periphery part of a 3rd Example. It is side surface sectional drawing of the duct of a 4th Example. It is side surface sectional drawing of the duct of a 5th Example. It is side surface sectional drawing of the duct of a 6th Example. It is side surface sectional drawing of the duct of a 7th Example. It is a perspective view of the coil unit of an 8th Example.

Explanation of symbols

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 apparatus 17 (17a, 17b) Duct 18 Opening 28 Cooling air 29 Ventilation hole 30 Flow 31 Gap 32 Nozzle 35 Upper wall surface

Claims (2)

A top plate provided on the upper surface of the main body,
An induction heating coil provided below the top plate, a coil base on which the induction heating coil is placed, and a radial base mounted on the induction heating coil in the coil base and generated from the induction heating coil A coil unit composed of a plurality of rod-shaped ferrites that stop the flow of magnetic field lines downward,
A fan device provided inside the main body;
In an induction heating cooker provided with a duct for guiding air blown from the fan device to the coil unit,
A plurality of openings are provided on the upper surface of the duct located below the coil unit, and cooling air blown from the plurality of openings is collided with the lower surface of the coil unit to cool the back surface of the induction heating coil by the flow of a multi-hole collision jet. An induction heating cooker characterized in that cooling air blown out from the plurality of openings collides with the ferrite to cool the heat transferred from the induction heating coil to the ferrite by heat conduction. A top plate on which the cooking pan to be heated is placed;
An induction heating coil for generating an eddy current in the cooking pan placed above by the magnetic lines generated by the flowing current and generating heat in the cooking pan itself;
A coil base for mounting and holding the induction heating coil;
A set of several rod-shaped ones, mounted in the coil base radially with respect to the induction heating coil, and a ferrite that stops the flow of magnetic lines generated from the induction heating coil downward,
A coil unit including the induction heating coil, the coil base, and the ferrite;
A duct provided below the coil unit and having a plurality of openings on the upper surface;
A fan device that blows out air to be blown from the plurality of openings and collides with the coil unit so that the cooling air blown out substantially vertically from the plurality of openings collides with the ferrite portion;
An induction heating cooker comprising:

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