JP2012084236A - Electromagnetic induction heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic induction heating cooker capable of improving detection accuracy of a temperature on the outer peripheral side more than the center in the bottom of a vessel to be heated.SOLUTION: In an electromagnetic induction heating cooker, an opening 41 penetrating in the vertical direction that is orthogonal to the loading surface of a top plate is installed in a coil support base 40 in which a plurality of annular heating coils 30 are concentrically arranged at an interval in the cross direction that is along the loading surface of the top plate. At least one portion of the opening 41 is configured to be situated, in a plan view, outside a main ventilation area R enclosed by two line segments L1 and L2 connecting each of both ends 22e in the cross direction of an air exhaust 22 with each of both ends 51e in the cross direction of a discharge port 51 in blowing means 50, and outer peripheral side temperature detection means 2 is installed in a portion outside the main ventilation area R in the opening 41 of the coil support base 40, in a plan view.

Description

  The present invention provides a casing having a top plate on which a container to be heated can be placed, and a plurality of concentrically arranged in a laterally spaced state that is a direction along a placement surface of the top plate. An annular heating coil; a coil support that supports the plurality of heating coils on the upper surface; a blower that blows cooling air from the discharge port in the lateral direction; and a central portion of the plurality of heating coils. A central temperature detecting means for detecting the temperature of the bottom of the heating container, and an outer peripheral temperature detecting means for detecting the temperature of the bottom of the heated container between the heating coils adjacent inside and outside, An exhaust port for discharging the cooling air blown by the blower means to the outside of the casing is provided in a part of the circumferential direction of the section, and the blower means is provided with the discharge port facing the exhaust port. Cooled Is configured to flow from the discharge port toward the exhaust port, and the coil support is provided with a central portion of the plurality of heating coils positioned between the air blowing unit and the exhaust port. The present invention relates to an electromagnetic induction heating cooker.

Such an electromagnetic induction heating cooker generates an induction current in a heated container by applying a high frequency power to a heating coil and generating a high frequency magnetic field with the heated container placed on the top plate. The container is heated.
Disposing a plurality of annular heating coils concentrically at intervals in the lateral direction widens the distribution of the magnetic flux to be generated and suppresses variations in the magnetic flux density in the radial direction. This is for equalizing the heating of the container.
Then, by actuating the air blowing means, the cooling air is laterally vented from the discharge port to the exhaust port in the casing and discharged from the exhaust port, thereby cooling the heating coil and the like provided in the casing. It is like that.

The temperature of the bottom of the heated container is detected by the central temperature detecting means at the center of the plurality of heating coils, and the temperature of the bottom of the heated container is detected by the outer peripheral temperature detecting means between the heating coils adjacent to the inside and outside. The detection information of the temperature detection means at the center and the outer peripheral side is used for adjusting the heating amount for heating the heated container, detecting abnormal temperature rise of the heated container, and the like.
The reason why the central temperature detecting means and the outer peripheral temperature detecting means are provided as the temperature detecting means for detecting the temperature of the bottom of the heated container is as follows.

That is, since the temperature of the center part in the bottom part of the to-be-heated container reflects the temperature of the to-be-heated object in a to-be-heated container better than the temperature of the outer peripheral side, generally a center temperature detection means is provided.
However, in order to prevent the heated container from rotating easily when the heated container is placed on the top plate, a recess that bulges upward is provided in the center of the bottom of the heated container. There is a case. Thus, if there is a dent in the center of the bottom of the heated container, there will be a gap between the top plate and the central part of the bottom of the heated container. For example, there may be a delay in detection of abnormal temperature rise of the heated container.
On the other hand, on the outer peripheral side of the center of the bottom of the heated container, it is difficult to form a gap between the top plate and the outer peripheral side temperature detection means in addition to the central temperature detection means.

In such an electromagnetic induction heating cooker, conventionally, the outer peripheral side temperature detection means has a cooling air flow surrounded by two line segments connecting both ends of the exhaust port and both ends of the discharge port in plan view. It was provided in the part located in the main ventilation area (for example, refer patent document 1).
In Patent Document 1, the outer peripheral side temperature detecting means is provided between heating coils adjacent to each other inside and outside, and is symmetrical to the blowing means with respect to the centers of the plurality of heating coils in the main ventilation region (the blowing means). (On the opposite side).
Incidentally, in the above-mentioned Patent Document 1, two exhaust ports are provided at intervals in the circumferential direction of the side portion of the casing. In this case, the main ventilation region is the outer ends of the two exhaust ports. This is a range surrounded by two line segments connecting each and both ends of the discharge port.

JP 2005-78902 A

In the above-mentioned patent document 1, since the outer peripheral side temperature detection means is provided in the main ventilation region, the cooling air from the blower means tends to hit the outer peripheral side temperature detection means. There is a problem that the temperature detection accuracy of the container to be heated is deteriorated because it is easily affected by the cooling air.
In particular, since the outer peripheral side temperature detecting means is provided in a position symmetrical to the air blowing means with respect to the center of the plurality of heating coils in the main ventilation region, the cooling air that has contributed to the cooling of the heating coil is the outer peripheral side temperature. It hits the detection means. The heating coil rises in temperature when high-frequency power is applied, and the temperature rise varies according to the amount of power applied. Since the temperature of the wind is likely to fluctuate, the temperature detection accuracy of the heated container by the outer peripheral side temperature detection means is deteriorated.
On the other hand, when the outer peripheral side temperature detection means is provided on the same side as the blower means with respect to the center of the plurality of heating coils in the main ventilation region, the outer peripheral side temperature detection means approaches the discharge port of the blower means. Since it is easily cooled by the wind, the temperature detection accuracy of the heated container by the outer peripheral side temperature detection means is deteriorated.

  This invention is made | formed in view of this situation, The objective is to provide the electromagnetic induction heating cooking appliance which can improve the detection accuracy of the temperature in the outer peripheral side rather than the center in the bottom part of a to-be-heated container. is there.

In order to achieve the above object, an electromagnetic induction heating cooker according to the present invention is provided in a casing having a top plate on which a container to be heated can be placed, and is spaced horizontally in the direction along the placement surface of the top plate. A plurality of annular heating coils arranged concentrically with a space between them, a coil support base that supports the plurality of heating coils on the upper surface, and a blower that blows cooling air from the discharge port in the lateral direction Means for detecting the temperature of the bottom of the heated container at the center of the plurality of heating coils, and detecting the temperature of the bottom of the heated container between the heating coils adjacent to the inside and outside An outer peripheral side temperature detection means, and a part of the side of the casing in the circumferential direction is provided with an exhaust port for discharging cooling air blown by the blower means out of the casing, the blower means, Discharge Is provided in a state of being opposed to the exhaust port, and cooling air flows from the discharge port toward the exhaust port, and the coil support base blows the central portion of the plurality of heating coils to the air blower. Electromagnetic induction heating cooker provided in a state of being located between the means and the exhaust port,
The characteristic configuration is that the coil support base is provided with an opening that penetrates in the vertical direction, which is a direction orthogonal to the mounting surface of the top plate, and at least a part of the opening in plan view is the exhaust It is configured to be located outside the main ventilation region surrounded by two line segments connecting each of the lateral ends of the mouth and each of the lateral ends of the discharge port,
The outer peripheral side temperature detecting means is provided in a portion located outside the main ventilation region in the opening of the coil support in a plan view.

According to the above characteristic configuration, most of the cooling air blown from the discharge port of the blower means is below the coil support base, above the coil support base, or above and below the coil support base in the main ventilation area in the casing. Is discharged to the outside through the discharge port.
In addition, when most of the cooling air flows below the coil support base in the main ventilation region, a small amount of the cooling air that flows below the coil support base passes upward through the opening of the coil support base. To do.
Alternatively, when most of the cooling air flows above the coil support base in the main ventilation region, a small amount of the cooling air that flows above the coil support base faces the opening of the coil support base downward. pass.
Alternatively, when most of the cooling air passes through both the upper and lower sides of the coil support base in the main ventilation region, a small amount of cooling air is opened from the side of the coil support base where the cooling air flow is large to the small side. Pass through.

And since the outer periphery side temperature detection means is provided in the part located outside the main ventilation area in the opening part of a coil support stand in planar view, it ventilates the lower part, the upper part, or the upper and lower sides of the coil support stand in the horizontal direction. Since it is possible to suppress the cooling air from hitting the outer peripheral side temperature detecting means, it is possible to suppress the cooling air from affecting the temperature detection of the heated container by the outer peripheral side temperature detecting means.
In addition, since a small amount of cooling air passes through the opening of the coil support base toward the upper side or the lower side, the heating coils on both sides of the outer peripheral side temperature detecting means rise in temperature with the application of the high frequency power, and further Even if the degree of temperature rise varies according to the amount of applied electric power, it is possible to suppress the heat generated from the adjacent heating coils from affecting the temperature detection by the outer peripheral side temperature detection means.
Accordingly, it is possible to provide an electromagnetic induction heating cooker that can improve the temperature detection accuracy on the outer peripheral side of the center of the bottom of the heated container.

  A further characteristic configuration of the electromagnetic induction heating cooker according to the present invention is such that the outer peripheral side temperature detection means is configured such that, in a plan view, the cooling coil has a plurality of heating coils in a ventilation direction from the discharge port to the exhaust port. It exists in the point which was near to the side of the said heating coil of the inner side rather than the center of the radial direction between the said heating coils which adjoins inside and outside from the center part.

According to the above characteristic configuration, the influence of heat generated by the outer heating coil on the outer peripheral side temperature detecting means is suppressed.
That is, in the air flow direction of the cooling air from the discharge port to the exhaust port, in an area downstream of the central portion of the plurality of heating coils in the plan view, the outer heating coil is more cooled than the inner heating coil. Therefore, the cooling air heated to contribute to the cooling of the inner heating coil is passed through the outer heating coil, so that the outer heating coil has a higher temperature than the inner heating coil. Then, when the cooling air is a small amount outside the main ventilation region, the outer heating coil is disposed outside the main ventilation region in the region downstream of the central portion of the plurality of heating coils in the ventilation direction of the cooling air. Becomes hotter than the inner heating coil.
Thus, by providing the outer peripheral side temperature detecting means as in this characteristic configuration, it is possible to suppress the influence of heat generation of the outer heating coil on the high temperature side with respect to the outer peripheral side temperature detecting means. This makes it difficult for the heating coils on both the inner and outer sides to be affected by heat generation.
Accordingly, it is possible to further improve the temperature detection accuracy on the outer peripheral side of the center of the bottom of the heated container.

  The further characteristic structure of the electromagnetic induction heating cooking appliance which concerns on this invention exists in the point which the said outer peripheral side temperature detection means is provided in the location with many sum totals of the winding number of these heating coils in the circumferential direction.

According to the above characteristic configuration, the temperature of the portion where the temperature tends to be high at the bottom of the container to be heated can be detected by the outer peripheral side temperature detecting means.
In other words, in a state where a plurality of heating coils are arranged concentrically with a space therebetween in the lateral direction, the conductor that is wound in a spiral shape and constitutes the inner heating coil starts from the outermost periphery of the inner heating coil. The outer side of the heating coil is formed so as to be separated outward in the radial direction, and the conductor is wound in a spiral shape to form an outer heating coil. Therefore, between the heating coils adjacent to the inside and outside, in the circumferential direction, the portion where the conductor exists in a form extending from the outermost periphery of the inner heating coil to the innermost periphery of the outer heating coil, than the other portions, The total number of turns of the plurality of heating coils may be reduced.
And as the number of turns of the heating coil increases, the magnetic flux density increases and the generated induced current increases. Therefore, the temperature distribution at the bottom of the heated container has a large number of turns of the plurality of heating coils in the circumferential direction. The distribution is such that the temperature rises in the portion located above the location.
Accordingly, since the temperature of the portion where the temperature tends to be high at the bottom of the heated container is detected by the outer peripheral side temperature detecting means, the abnormal temperature rise of the heated container can be accurately detected.

According to a further feature of the electromagnetic induction heating cooker according to the present invention, a heat sink that dissipates heat generated from the heat generating member is provided below the coil support in the main ventilation region,
The outer peripheral side temperature detecting means is provided to be separated from the heat sink in the lateral direction.

According to the above characteristic configuration, since the heat sink is provided below the coil support base in the main ventilation region, the cooling air blown in the lateral direction from the discharge port is vented below the coil support base. Further, the cooling air can be blown while being effectively applied to the heat sink, and in addition to the coil support base, the heat generating member can also be appropriately cooled.
In addition, since the outer peripheral side temperature detecting means is provided laterally away from the heat sink, it is possible to suppress the outer peripheral side temperature detecting means from being influenced by the heat dissipated from the heat sink as much as possible. That is, the arrangement position of the outer peripheral side temperature detection means is a position opposite to the heat sink with respect to a line segment connecting the end of the exhaust port and the end of the discharge port.
Accordingly, it is possible to improve the temperature detection accuracy on the outer peripheral side of the center of the bottom of the heated container while appropriately cooling the heating member in addition to the coil support.

  According to a further feature of the electromagnetic induction heating cooker according to the present invention, the air guide plate is, in plan view, from the lateral end of the discharge port of the blowing means to the lateral end of the heat sink. The cooling air that is extended in the direction of connecting the discharge air flows from the discharge port flows toward the heat sink.

According to the above characteristic configuration, the cooling air blown from the discharge port is guided by the air guide plate so as to go to the heat sink, so that the cooling air is suppressed as much as possible to the outside temperature detection means side outside the main ventilation region. can do.
Accordingly, it is possible to further improve the temperature detection accuracy on the outer peripheral side of the center of the bottom of the heated container while appropriately cooling the heating member in addition to the coil support.

A further characteristic configuration of the electromagnetic induction heating cooker according to the present invention is that the air blowing means is provided below the coil support base in a state where a part thereof is overlapped with the coil support base in a plan view. At the outlet, at least a portion of the lateral end portions excluding the end portion on the outer peripheral side temperature detecting means side is configured to be covered with the coil support base,
The wind guide plate is provided in a state extending below the coil support;
The portion of the air guide plate that is located outside the coil support in plan view is configured to be higher than the upper surface of the coil support.

According to the above characteristic configuration, since the cooling air blown from the discharge port passes through both the upper and lower sides of the coil support table in the horizontal direction, the coil support table can be cooled from both the upper and lower sides.
The wind guide plate extends below the coil support and is guided so that the cooling air passing below the coil support is directed to the heat sink. Can be suppressed as much as possible.
Also, in plan view, the portion of the air guide plate located outside the coil support base is higher than the upper surface of the coil support base, so that the cooling air that is blown from the discharge port and flows above the coil support base is outside the main ventilation area. Ventilation toward the outer peripheral side temperature detection means side can be suppressed as much as possible.
Therefore, it is possible to improve the temperature detection accuracy on the outer peripheral side from the center at the bottom of the container to be heated, while cooling the coil support table more appropriately by passing both the upper and lower sides of the coil support table. Can do.

Perspective view of electromagnetic induction heating cooker Top view of the electromagnetic induction heating cooker with a part of the top plate cut out III-III arrow view of FIG. Top view of electromagnetic induction heating cooker with top plate and upper case member omitted An exploded perspective view of the electromagnetic induction heating cooker with the top plate and the upper case member omitted Perspective view of electromagnetic induction heating cooker with top plate and upper case member omitted VII-VII arrow view of the main part of FIG. Top view of coil support IX-IX arrow view of the main part of FIG. XX arrow view of the main part of FIG. The top view of the electromagnetic induction heating cooking appliance in the state where the top plate and upper case member concerning another embodiment were omitted

Hereinafter, an embodiment in which the invention is applied to a plate-shaped and portable electromagnetic induction heating cooker will be described with reference to the drawings.
As shown in FIG. 2, the electromagnetic induction heating cooker is placed on the placement surface 21 s of the top plate 21 in the casing 20 having the top plate 21 on which the heated container Y (see FIGS. 1 and 10) can be placed. A plurality of annular heating coils 30 arranged concentrically at intervals in the transverse direction, the coil support base 40 that supports the plurality of heating coils 30 on the upper surface, and the cooling air A is discharged. A blower 50 as a blowing means for blowing air from the outlet 51 in the lateral direction, and a central temperature sensor 1 as a central temperature detection means for detecting the temperature of the bottom of the heated container Y at the central portion 30c of the plurality of heating coils 30; The outer peripheral side temperature sensor 2 as an outer peripheral side temperature detecting means for detecting the temperature of the bottom portion of the heated container Y is provided between the heating coils 30 adjacent to each other inside and outside.
An exhaust port 22 (see FIG. 4) for discharging the cooling air A blown by the blower 50 to the outside of the casing 20 is provided in a part of the side portion of the casing 20 in the circumferential direction, and the blower 50 exhausts the discharge port 51. The cooling air A is provided so as to face the port 22, and is configured such that the cooling air A flows from the discharge port 51 toward the exhaust port 22.
Further, the coil support base 40 is provided in a state where the central portions 30 c of the plurality of heating coils 30 are positioned between the blower 50 and the exhaust port 22.

  In the present invention, as shown in FIG. 4, six openings 41 penetrating in the vertical direction, which is a direction orthogonal to the mounting surface 21 s of the top plate 21, are arranged in the coil support base 40 at equal intervals in the circumferential direction. Provided in a plan view, at least a part of the opening 41 connects two line segments 22e and 22e in the horizontal direction of the exhaust port 22 and two line segments 51e and 51e in the horizontal direction of the discharge port 51, respectively. It is configured to be located outside the main ventilation region R surrounded by L1 and L2. The outer peripheral side temperature sensor 2 is provided in the opening 41 of the coil support base 40 and in a portion located outside the main ventilation region R in plan view. In FIG. 4, the plurality of heating coils 30, the central temperature sensor 1, and the outer peripheral temperature sensor 2 are indicated by virtual lines.

Hereinafter, description is added about each part of an electromagnetic induction heating cooking appliance.
As shown in FIG. 1 to FIG. 3, in this embodiment, the casing 20 is configured in a rectangular shape in plan view, and the front side of the upper surface is an inclined portion that is inclined downward. An operation unit 60 including a switch for instructing various control commands and a display for displaying various information is provided.
The casing 20 includes a lower case member 23, an upper case member 24 having a rectangular opening at a location excluding an inclined portion on the upper surface, and a rectangular top plate that closes the opening of the upper case member 24 from above. 21 etc. are comprised.
The top plate 21 is fixed to the edge of the opening of the upper case member 24 with an adhesive (not shown) with a square frame-shaped magnetic shield member (not shown) interposed therebetween. The upper case member 24 and the lower case member 23 to which are fixed are integrally assembled by a plurality of screws (not shown).
Incidentally, the top plate 21 is made of a heat-resistant material having high magnetic permeability and low thermal conductivity, for example, glass or ceramic. As an adhesive, the top plate 21 and the upper case member 24 are hermetically sealed. In order to achieve this, a silicon sealant having adhesive performance is used.

As shown in FIGS. 3 to 6, the rear wall portion of the lower case member 23 is provided with a plurality of slits 22 s constituting the exhaust port 22 over the substantially entire length in the lateral direction. That is, the exhaust port 22 is provided in the rear wall portion (corresponding to a part in the circumferential direction of the side portion) of the rectangular casing 20 in a plan view over substantially the entire length in the lateral direction. In FIGS. 5 and 6, the plurality of heating coils 30, the central temperature sensor 1, and the outer peripheral temperature sensor 2 are indicated by virtual lines.
The laterally outer end 22e of each of the slits 22s at both ends of the plurality of slits 22s arranged in the lateral direction corresponds to the lateral end 22e of the exhaust port 22.

As shown in FIGS. 4 to 6, an intake port 25 including a plurality of radially arranged slits 25 s is provided at a position close to the left front side in plan view on the bottom plate of the lower case member 23.
Further, on the bottom plate of the lower case member 23, an outer plate 52 constituting the outer shell of the blower 50 is a front side portion of the outer peripheral portion of the intake port 25 in a plan view with the plate surface directed in the vertical direction. Is provided in a generally arcuate shape that is slightly larger than the semicircle along. However, both ends in the longitudinal direction of the substantially arc-shaped outer shell plate 52 surround the pair of boss portions 3 (see FIG. 5) standing upright to support a motor 53 of the blower 50 described later. It is configured in a shape that bulges to the side.
Both ends in the longitudinal direction (51e, 51e in the figure) of the substantially arc-shaped outer plate 52 have a right edge (51e in the figure) from a left edge (51e in the figure) in plan view. Is also configured to be located on the front side (see FIG. 4).
The arcuate outer plate 52 is partitioned by both longitudinal edges (51e and 51e in the drawing) and the arcuate opening along the outer periphery of the air intake port 25 in plan view is formed on the blower 50. Both ends of the outer plate 52 in the longitudinal direction (51e, 51e in the figure) are the opposite ends 51e, 51e in the lateral direction of the discharge port 51.
That is, the discharge port 51 of the blower 50 is provided so as to open toward the upper right in plan view.

As shown in FIGS. 4 to 6, the air guide plate 4 to be described later extends substantially in the tangential direction from the right end edge (51e in the drawing) in the plan view of the substantially arcuate outer plate 52. The inner wall body 5 extends from the left edge (51e in the figure) in plan view so as to extend along the left side wall, the rear wall, and the right side wall of the casing 20 with a space therebetween. ing.
Similarly to the upper case member 24, the lower case member 23 is manufactured by molding with resin, and the outer plate 52, the air guide plate 4 and the inner wall body 5 are molded with the lower case member 23. However, since the functions are different from each other, different reference numerals are given.

As shown in FIGS. 4 to 6, the motor 53 in which the blade body 54 is connected to the output shaft (not shown) is in a state where the blade body 54 is positioned in the outer arc-shaped outer plate 52. 3 is attached with a screw 6.
That is, the fan 50 includes a blade body 54, a motor 53 that drives and rotates the blade body 54, and an outer plate 52 that forms an outer periphery of the blower 50 and forms a discharge port 51 of the blower 50. The blower 50 is provided with the discharge port 51 facing the exhaust port 22 as described above.

As shown in FIG. 3 to FIG. 6, the control board 11 occupies approximately half of the rear side inside the inner wall body 5 of the casing 20 in a plan view and is located above the bottom plate of the lower case member 23. It is supported.
The control board 11 includes a heat sink 10 that dissipates heat generated from a heat generating member (not shown), various circuit components, an inverter that adjusts the amount of high-frequency power that excites a plurality of heating coils 30, and electromagnetic A control unit (not shown) for controlling the operation of the induction heating cooker is mounted.
The heat sink 10 is provided with a plurality of fins 10f in parallel with each other, and a semiconductor switching element (not shown) or the like constituting the inverter is attached to the heat sink 10 as a heat generating member to cool the semiconductor switching element. Has been.
And this heat sink 10 is the attitude | position which put each radiation fin 10f along the front-back direction of the casing 20 (flow direction of the cooling air A ventilated toward the exhaust port 22 from the discharge outlet 51 of the air blower 50), and the air blower 50. And mounted on the control board 11 so as to be positioned between the exhaust port 22 and the exhaust port 22.
In other words, the cooling air A blown from the discharge port 51 of the blower 50 is made to flow effectively along the plurality of heat radiation fins 10f, so that the heat sink 10 is effectively radiated with heat.

By the way, among various circuit components, the choke coil 7 and the capacitors 8 and 9 constituting the smoothing circuit (not shown) for smoothing the output of the rectifier (not shown) generate a relatively large amount of heat.
Therefore, the choke coil 7 and the two capacitors 8 and 9 having a relatively large calorific value are mounted on the control board 11 so as to be located leeward of the cooling air A with respect to the heat sink 10. The cooling air A that has flowed along the fins 10 f is configured to easily hit the choke coil 7 and the capacitors 8 and 9.
Furthermore, the larger capacitor 8 of the two capacitors 8 and 9 has an elongated rectangular parallelepiped shape. The rectangular parallelepiped capacitor 8 has a longitudinal direction in which the cooling air A is passed in plan view. By providing in a posture inclined with respect to the direction, the area to which the cooling air A hits is increased so that cooling is effectively performed.

As shown in FIGS. 4, 8, and 9, the coil support base 40 has a substantially circular outer shape, and is insulated in a generally wheel shape having six fan-shaped openings 41 arranged at equal intervals in the circumferential direction. Consists of materials.
In each of the portions 42 (corresponding to the spokes of the wheel, which may be referred to as spoke-like portions hereinafter) corresponding to the gaps between the openings 41 in the coil support base 40, the concave portions 43 (see FIG. 9) recessed downward. In each recess 43, a ferrite core 44 is provided in a form extending in the radial direction of the coil support base 40.
The upper surface of the ferrite core 44 provided in the concave portion 43 of the coil support base 40 is configured to be lower than the upper surface of the coil support base 40. Silicon sealant 45 is filled so as to be substantially flush with the upper surface.

And on the upper surface of the coil support base 40, as a plurality of heating coils 30, an annular inner heating coil 31 and an annular outer heating coil 32 having a larger diameter than the inner heating coil 31 are connected in series with each other, In addition, the outer heating coil 32 is concentrically provided outside the inner heating coil 31.
As shown in FIG. 8, the inner heating coil 31 is spirally wound a plurality of times (14 times in this embodiment) in a state where the conductor 33 is in close contact or close to the upper surface direction of the coil support base 40 from the starting point S1 on the inner peripheral side. ) It is configured by being wound, and the outermost periphery is terminated at an end point E1 just before the start point S1 in the circumferential direction.
The conductor 33 constituting the inner heating coil 31 extends from the end point E1 of the inner heating coil 31 so as to be away from the radial direction outward, and the outer heating coil 32 has the conductor 33 extending from the end point E1 of the inner heating coil 31. It is configured to be wound in a spiral shape a plurality of times (in this embodiment, 10 times) in close contact with or close to the upper surface direction of the coil support base 40 from the inner periphery side start point S2, and the outermost periphery is the start point in the circumferential direction. Winding is terminated at the end point E2 at the same position as S2.
Accordingly, the total number of turns of the inner heating coil 31 and the outer heating coil 32 is 24 in the range D1 from the starting point S1 of the inner heating coil 31 to the end point E1 of the inner heating coil 31 in the winding direction in the circumferential direction. In the circumferential direction, the range D2 from the end point E1 of the inner heating coil 31 to the starting point S1 of the inner heating coil 31 in the winding direction is 23 times.

As shown in FIGS. 8 and 10, the sensor holder 46 that holds the outer temperature sensor 2 has a circumferential direction D1 in which the total number of turns of the inner heating coil 31 and the outer heating coil 32 is 24 times ( Between the inner heating coil 31 and the outer heating coil 32 in a state straddling the spoke-like portions 42 on both sides of the opening 41 existing in the range where the total number of turns of the inner heating coil 31 and the outer heating coil 32 is large). It is provided in the position.
And the outer peripheral side temperature sensor 2 is provided in the sensor holder 46 in the state biased upward by the elastic body (illustration omitted).
A sensor mounting hole 47 is provided in the central portion of the coil support base 40, and the central temperature sensor 1 is provided in the sensor mounting hole 47 in a state of being biased upward by an elastic body (not shown). Yes.

Based on FIG.8 and FIG.10, further description is added about the attachment position of the outer peripheral side temperature sensor 2. FIG.
In addition, the position of the outer peripheral side temperature sensor 2 in the radial direction of the heating coil 30 is indicated by a portion corresponding to the center in the radial direction of the heating coil 30 in the outer peripheral side temperature sensor 2.
If the center in the radial direction between the outer peripheral edge of the inner heating coil 31 and the inner peripheral edge of the outer heating coil 32 (hereinafter sometimes referred to as the center between the inner and outer coils) is Pc, the outer peripheral temperature sensor 2 is a flat surface. In view, it is provided at a location closer to the inner heating coil 31 side than the center Pc between the inner and outer coils.
That is, the outer peripheral side temperature sensor 2 is located closer to the inner side of the heating coil 30 (specifically, the inner heating coil 31) than the center in the radial direction between the heating coils 30 adjacent to each other in plan view. Will be provided.
In addition, the outer peripheral temperature sensor 2 has a distance Wi between the outer peripheral edge of the inner heating coil 31 and the outer peripheral edge of the inner heating coil 31 between the outer peripheral edge of the inner heating coil 31 and the inner / outer coil center Pc. It is arranged at a location where it becomes larger (location closer to the center Pc between the inner and outer coils).

As shown in FIGS. 4 to 6, the coil support in which the inner heating coil 31 and the outer heating coil 32 are concentrically arranged on the upper surface as described above and the central temperature sensor 1 and the outer temperature sensor 2 are provided. In a state where the base 40 is partially overlapped with the blower 50 and the heat sink 10 in a plan view, and the central portion 30c of the plurality of heating coils 30 is positioned between the blower 50 and the exhaust port 22, the blower 50 and the heat sink 10 is disposed above.
In arranging the coil support 40 in this way, the position of the outer peripheral side temperature sensor 2 is, as shown in FIG. 4, in the plan view, outside the right side in the main ventilation region R and at the outlet of the blower 50. It is set at a position downstream of the central portions 30 c of the plurality of heating coils 30 in the direction of the cooling air A from 51 to the exhaust port 22.
The coil support base 40 is attached to the three boss portions 12 (see FIG. 5) erected on the bottom plate of the lower case member 23 with screws 13.
In the state in which the coil support base 40 is arranged in this way, as shown in FIG. 4, the portion excluding the lateral ends 51 e and 51 e side of the discharge port 51 of the blower 50 is caused by the coil support base 40. It is configured to be covered.

Further, the upper case member 24 is assembled to the upper portion of the lower case member 23, and the top plate 21 is attached to the upper case member 24 so that the casing 20 is assembled integrally.
As shown in FIG. 10, in the state where the coil support base 40 is provided in the casing 20 as described above, the central temperature sensor 1 and the outer peripheral temperature sensor 2 are placed on the back surface of the top plate 21 by the biasing force of each elastic body. The temperature of the heated container Y placed on the top plate 21 is detected by the central temperature sensor 1 and the outer temperature sensor 2 through the top plate 21.

As shown in FIGS. 4 to 6, the above-described air guide plate 4 is extended from the lateral end 51 e of the discharge port 51 in a direction to connect the lateral end of the heat sink 10 in a plan view. Thus, the cooling air A sent from the discharge port 51 is configured to flow toward the heat sink 10.
Further, the air guide plate 4 is provided in a state extending below the formation portion of the recess 43 in the coil support base 40, and further, as shown in FIG. 7, the outside of the coil support base 40 in the air guide plate 4 in a plan view. The part located in is configured to be higher than the upper surface of the coil support base 40 in a side view.
Although not shown, the air guide plate 4 is provided on the side of the concave portion 43 in a state of extending below the coil support base 40 and being superimposed on the concave portion 43 of the coil support base 40 in a side view. You can also. In this case, the cooling air A can be prevented from leaking to the outside of the air guide plate 4, and the cooling air A can be effectively guided to the heat sink 10.

With the arrangement as described above, the blower 50, the coil support base 40, and the control board 11 are provided in the casing 20, so that the outer temperature sensor 2 is cooled from the discharge port 51 to the exhaust port 22 in a plan view. In the ventilation direction of the wind A, the heating coil 30 (specifically, on the downstream side of the central portion 30c of the plurality of heating coils 30 and inside the radial center between the heating coils 30 adjacent inside and outside (specifically, the heating coil 30) In other words, it is provided at a location near the inner heating coil 31).
Moreover, the outer peripheral side temperature sensor 2 is provided in the location where there are many total turns of the some heating coil 30 in the circumferential direction.

In addition, a heat sink 10 that dissipates heat generated from the heat generating member is provided below the coil support base 40 in the main ventilation region R, and the outer peripheral temperature sensor 2 is provided laterally away from the heat sink 10. It will be.
Further, the blower 50 is provided below the coil support base 40 in a state where a part thereof is overlapped with the coil support base 40 in a plan view, and at the discharge port 51, at least the outer peripheral side temperature of both lateral ends. The portion excluding the end portion on the sensor 2 side is configured to be covered with the coil support base 40.

Hereinafter, based on FIG. 4, description is added about the ventilation effect | action by the air blower 50. FIG.
In FIG. 4, the flow state of the cooling air A is indicated by arrows. However, in plan view, the range in which the coil support base 40 does not exist and the flow state in the cooling air A blown toward the lower side of the coil support base 40 are indicated by thick arrows, and are directed upward of the coil support base 40. The flow state in the blown cooling air A is indicated by a thin line arrow.
Since the top of the blade body 54 of the blower 50 is covered by the top plate 21, the pressure above the blade body 54 increases, so that most of the cooling air A sucked from the inlet 25 on the bottom plate of the casing 20 is discharged. Air is blown from the outlet 51.
Then, the cooling air A blown from the discharge port 51 is divided into the upper and lower portions of the coil support base 40 under the condition that the lower part of the coil support base 40 increases, and the air is exhausted through the upper and lower sides of the coil support base 40. It is discharged out of the casing 20 through the port 22. Incidentally, the ratio of the air flow rate of the cooling air A below the coil support base 40 and the air flow rate of the cooling air A above the coil support base 40 is set to about 70:30 in this embodiment, for example. ing.
Although not shown, a small amount of the cooling air A that flows below the coil support 40 passes upward through the openings 41 of the coil support 40 and passes above the coil support 40. Then, it is discharged out of the casing 20 from the exhaust port 22.
That is, since the cooling air A blown from the discharge port 51 ventilates both the upper and lower sides of the coil support base 40 in the horizontal direction, the coil support base 40 can be cooled from both the upper and lower sides, and the plurality of heating coils 30 are effective. Can be cooled.

And since the outer peripheral side temperature sensor 2 is provided in the part located in the opening 41 of the coil support stand 40 in the opening 41 of the coil support stand 40 in planar view, the upper and lower sides of the coil support stand 40 are set to the horizontal direction. Since it is possible to minimize the flow of the cooling air A passing through the outer peripheral temperature sensor 2, it is possible to suppress the cooling air A from affecting the temperature detection by the outer peripheral temperature sensor 2.
Moreover, since the cooling air A passes through the opening 41 of the coil support base 40 upward, although only a small amount, the inner heating coil 31 and the outer heating coil 32 adjacent to the outer side temperature sensor 2 apply high frequency power. Even if the temperature rises along with the fluctuation of the amount of electric power applied, the heat generated from the inner heating coil 31 and the outer heating coil 32 adjacent to each other can be increased. It is possible to suppress as much as possible the influence on the temperature detection by.

Furthermore, the outer side temperature sensor 2 is, in plan view, in the ventilation direction of the cooling air A, on the downstream side of the center part 30c of the inner heating coil 31 and the outer heating coil 32, and the inner heating coil 31 adjacent to the inner and outer sides. And the outer heating coil 32 are provided at locations closer to the inner heating coil 31 than the radial center Pc.
Thereby, in the ventilation direction of the cooling air A, the outer heating coil 32 is hotter than the inner heating coil 31 in a region downstream of the central portion 30c of the inner heating coil 31 and the outer heating coil 32 in plan view. However, since the influence of the heat generation of the outer heating coil 32 on the outer peripheral side temperature sensor 2 can be suppressed, the outer peripheral side temperature sensor 2 is hardly affected by the heat generation of the outer heating coil 32.
In addition, the outer peripheral temperature sensor 2 is disposed between the outer peripheral edge of the inner heating coil 31 and the center Pc between the inner and outer coils at a location close to the center Pc between the inner and outer coils. Since it is separated from the inner heating coil 31 as much as possible, the outer peripheral side temperature sensor 2 is hardly affected by the heat generated by the inner heating coil 31.

In addition, as indicated by a thick arrow in FIG. 4, the cooling air A blown from the discharge port 51 downward to the coil support base 40 is guided by the air guide plate 4 toward the heat sink 10, and Since it is suppressed from going outside the ventilation region R, the cooling air A can flow toward the outer peripheral temperature sensor 2 outside the main ventilation region R while effectively cooling the heat generating components mounted on the heat sink 10. Can be suppressed as much as possible.
Furthermore, since the portion of the air guide plate 4 located outside the coil support base 40 is higher than the upper surface of the coil support base 40 in plan view, the coil support is provided from the discharge port 51 as indicated by a thin line arrow in FIG. The cooling air A blown toward the upper side of the table 40 is suppressed from flowing outside the main ventilation region R, and the cooling air A flowing above the coil support table 40 is also at the outer peripheral side temperature. Ventilation toward the sensor 2 can be suppressed as much as possible.
In addition, since the air guide plate 4 extends to the lower part of the coil support base 40 where the recess 43 is formed, the gap between the lower surface of the coil support base 40 and the upper end of the air guide plate 4 can be made as small as possible. The cooling air A can be prevented from leaking to the outside of the air guide plate 4, and the cooling air A can be effectively directed toward the heat sink 10.
Although not shown, when the air guide plate 4 is provided on the side of the concave portion 43 in a state of extending below the coil support base 40 and being superimposed on the concave portion 43 of the coil support base 40 in a side view. The cooling air A can be prevented from leaking to the outside of the air guide plate 4, and the cooling air A can be effectively guided to the heat sink 10.

  As described above, in addition to providing the outer peripheral temperature sensor 2 outside the main ventilation region R, the outer peripheral temperature sensor 2 is disposed between the heating coils 30 adjacent to the inside and outside in the above arrangement form, Further, due to the synergistic effect of providing the air guide plate 4 as described above, the influence of the cooling air A and the heat generation of the internal and external heating coils 30 on the temperature detection by the outer peripheral temperature sensor 2 are suppressed as much as possible. Therefore, the temperature detection accuracy on the outer peripheral side of the bottom of the heated container Y can be improved as much as possible.

[Another embodiment]
(A) The arrangement form of the coil support base 40 and the blower 50 is not limited to the form exemplified in the above embodiment.
In the above embodiment, the blower 50 is provided below the coil support 40 in a state where a part of the blower 50 is overlapped with the coil support 40 in a plan view. Conversely, the blower 50 is partially supported by a coil in a plan view. You may provide above the coil support stand 40 in the state piled up on the stand 40. FIG.
Further, the blower 50 and the coil support base 40 may be arranged side by side without overlapping.

(B) In the embodiment described above, two inner heating coils 31 and two outer heating coils 32 are provided as the plurality of annular heating coils 30, but three or more annular heating coils 30 are spaced apart in the lateral direction. You may arrange | position concentrically in the state separated. In this case, two or more between the heating coils 30 adjacent to each other inside and outside (hereinafter sometimes referred to as between the heating coils) are formed, but the outer peripheral temperature sensor 2 may be provided between one heating coil. It is good and you may provide in each between several heating coils.

(C) In configuring the outer peripheral temperature sensor 2 to be provided at a portion located outside the main ventilation region R in the opening 41 of the coil support base 40 in plan view, in the above embodiment, the main ventilation is provided. Although it is configured to be provided outside one side (line L2 side) in the horizontal direction in the region R, it is provided outside each side in the horizontal direction (line L1, L2 side) in the main ventilation region R. You may comprise as follows.

(D) In the above-described embodiment, the outer peripheral side temperature sensor 2 is located downstream of the central portions 30c of the plurality of heating coils 30 in the ventilation direction of the cooling air A from the discharge port 51 toward the exhaust port 22 in plan view. However, it may be provided upstream of the central portion 30c of the plurality of heating coils 30.

(E) As shown in FIG. 11, two exhaust ports 22 may be provided at intervals in the circumferential direction of the side portion of the casing 20. Incidentally, in the example shown in FIG. 11, the two exhaust ports 22 are provided so as to be distributed to the rear wall portion and the right wall portion of the lower case member 23.
In this case, as shown in FIG. 11, the main ventilation region R is formed by two line segments L1 and L2 connecting the outer ends 22e and 22e of the two exhaust ports 22 and the both ends 51e of the discharge port 51, respectively. The range is surrounded.
Similarly to the above embodiment, the outer peripheral temperature sensor 2 is provided in the opening 41 of the coil support base 40 and in a portion located outside the main ventilation region R in plan view.
Further, in the plan view, the outer peripheral temperature sensor 2 is downstream of the central portion 30c of the plurality of heating coils 30 and adjacent to the inside and outside in the ventilation direction of the cooling air A from the discharge port 51 to the exhaust port 22. It is provided at a location that is closer to the inner heating coil 30 (specifically, the inner heating coil 31) than the center in the radial direction between the matching heating coils 30.
In addition, in FIG. 11, the several heating coil 30, the center temperature sensor 1, and the outer peripheral side temperature sensor 2 are shown with the virtual line. Further, in a plan view, the range in which the coil support base 40 does not exist and the flow state in the cooling air A blown toward the lower side of the coil support base 40 are indicated by bold arrows and are directed upward of the coil support base 40. The flow state in the blown cooling air A is indicated by a thin line arrow.

(F) The arrangement position of the outer peripheral side temperature sensor 2 is the position exemplified in the above embodiment, that is, the heating coil 30 on the inner side of the radial center between the heating coils 30 adjacent inside and outside in plan view. It is not limited to the part which approached the side (specifically the inner side heating coil 31). For example, in the plan view, the center in the radial direction between the heating coils 30 adjacent inside and outside may be used, or the outside heating coil 30 (specifically, the outside heating) between the heating coils 30 adjacent inside and outside in the plan view. A location close to the coil 32) may be used.

(G) In the above embodiment, the inner heating coil 31 and the outer heating coil 32 are connected in series, but may be connected in parallel.

(H) The shape of the casing 20 in plan view is not limited to the rectangular shape illustrated in the above embodiment, and may be, for example, a circular shape.

(I) The electromagnetic induction heating cooker to which the present invention can be applied is not limited to the type illustrated in the above embodiment, that is, the plate-shaped and portable electromagnetic induction heating cooker.
For example, a so-called two-port or three-port stationary electromagnetic induction heating cooker provided with a plurality of heating units including a plurality of heating coils 30 and an inverter that excites them may be used.

  As described above, it is possible to provide an electromagnetic induction heating cooker that can improve the temperature detection accuracy on the outer peripheral side of the center of the bottom of the heated container.

1 Central temperature sensor (Central temperature detection means)
2 Outer temperature sensor (outer temperature detector)
4 Wind guide plate 10 Heat sink 20 Casing 21 Top plate 21s Placement surface 22 Exhaust port 22e End 30 in the horizontal direction of the exhaust port Heating coil 30c Heating coil central part 40 Coil support base 41 Opening part 50 Blower (blower means)
51 Discharge port 51e Horizontal end A of discharge port Cooling air L1, L2 Line segment R Main ventilation area Y Heated container

Claims (6)

A plurality of annular heating coils disposed concentrically in a casing having a top plate on which a container to be heated can be placed, spaced apart in a lateral direction that is a direction along the placement surface of the top plate. A coil support base for supporting the plurality of heating coils on the upper surface, a blowing means for blowing cooling air from the discharge port in the lateral direction, and a bottom portion of the heated container at the center of the plurality of heating coils A central temperature detecting means for detecting the temperature of the outer peripheral side temperature detecting means for detecting the temperature of the bottom of the heated container between the heating coils adjacent to each other inside and outside,
An exhaust port for discharging the cooling air blown by the blowing means to the outside of the casing is provided in a part of the circumferential direction of the side portion of the casing,
The air blowing means is provided in a state where the discharge port faces the exhaust port, and the cooling air is configured to flow from the discharge port toward the exhaust port.
The coil support is an electromagnetic induction heating cooker provided in a state where the center of the plurality of heating coils is positioned between the air blowing means and the exhaust port,
The coil support is provided with an opening that penetrates in a vertical direction that is a direction orthogonal to the mounting surface of the top plate, and in plan view, at least a part of the opening is in the lateral direction of the exhaust port. Is configured to be located outside the main ventilation region surrounded by two line segments connecting each of both ends of the discharge port and each of both ends of the discharge port in the lateral direction,
The electromagnetic induction heating cooker in which the outer peripheral temperature detection means is provided in a portion located outside the main ventilation region in the opening of the coil support base in a plan view.   In the plan view, the outer peripheral side temperature detecting means is adjacent to the inside and outside of the plurality of heating coils in the air flow direction of the cooling air from the discharge port toward the exhaust port. The electromagnetic induction heating cooker according to claim 1, wherein the electromagnetic induction heating cooker is provided at a location near the heating coil inside the radial center between the coils.   The electromagnetic induction heating cooker according to claim 1 or 2, wherein the outer peripheral side temperature detecting means is provided at a location where the total number of turns of the plurality of heating coils is large in the circumferential direction. A heat sink for dissipating heat generated from the heat generating member is provided below the coil support in the main ventilation region,
The electromagnetic induction heating cooker according to any one of claims 1 to 3, wherein the outer peripheral side temperature detecting means is provided to be spaced apart from the heat sink in the lateral direction.   In a plan view, the air guide plate extends from the lateral end of the discharge port of the air blowing means in a direction connecting the lateral end of the heat sink, and is sent out from the discharge port. The electromagnetic induction heating cooker according to claim 4, wherein the cooling air is configured to flow toward the heat sink. The air blowing means is provided below the coil support base in a state of being partially overlapped with the coil support base in a plan view, and at the discharge port, at least the outer peripheral side of the lateral ends. The portion excluding the end on the temperature detection means side is configured to be covered with the coil support,
The wind guide plate is provided in a state extending below the coil support;
The electromagnetic induction heating cooker according to claim 5, wherein a portion of the air guide plate located outside the coil support base in plan view is configured to be higher than an upper surface of the coil support base.

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