JP2015159026A - electromagnetic cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic cooker to which a technical idea suitable for a table top type article having plural heating units and an operation power supply of 200 V is applied.SOLUTION: An electromagnetic cooker has plural heating units which perform heating operation by making AC current flow in induction coils. A printed wiring board on which plural electronic parts constituting a constituent part for supplying AC current to the induction coils and a constituent portion for controlling the supply of AC current are mounted is provided to each heating unit, and the plural printed wiring boards provided to the respective heating units have the same construction in hardware, containing the types of the mounted electrical parts. Accordingly, the whole construction can be simply designed at low cost by making the construction common even when the heating mode and the heating step are different among the heating units.

Description

  The present invention relates to an electromagnetic cooker, and can be applied to, for example, an electromagnetic cooker having a plurality of heating units using a commercial power supply of 200 V as an operation power supply.

  Due to electromagnetic induction caused by the current flowing through the induction coil, cooking containers such as pots, kettles, and frying pans (hereinafter, various cooking containers may be collectively referred to as “pans”) generate heat and heat the liquid in the pots. Conventional electromagnetic cookers that perform cooking include a desktop type that can be carried (portable) in addition to a stationary type that is not portable such as that incorporated in a system kitchen.

  Many desktop-type electromagnetic cookers have a single heating unit for simple applications such as boiling hot water. In addition, most of the desktop-type electromagnetic cookers use a 100 V commercial power source as a power source so that the power source can be easily secured even at a portable place due to its portability.

  Recently, an electromagnetic cooker having a plurality of heating units that can be applied to cooking as a substitute for a stationary type electromagnetic cooker has been proposed as a tabletop type electromagnetic cooker. Also, a commercial power supply of 100V is used (see Non-Patent Document 1). Incidentally, most of the stationary type electromagnetic cookers have a plurality of heating units and grills using a commercial power source of 200 V (see Patent Document 1).

Japanese Patent Laying-Open No. 2005-076997

http: // kaden. watch. impres. co. jp / docs / news / 201211119 574038. html

  As described above, an electromagnetic cooker that can be used as an alternative to a stationary electromagnetic cooker has been proposed, but since a 100 V commercial power source is used as an operating power source, a stationary type using a 200 V commercial power source as an operating power source is proposed. Compared with the electromagnetic cooker, cooking performance is somewhat lower. Therefore, the patent applicant has been researching and developing a tabletop electromagnetic cooker having a plurality of heating units using a 200 V commercial power supply as an operation power supply.

  Even in the same desktop type, matters that must be taken into consideration are different, for example, the maximum power consumption allowed for one heating unit is greatly different between 200 V and 100 V operating power.

  In addition, even if the same 200V is used as the operating power supply, the desktop type electromagnetic cooker is required to be lightweight and downsized for portability, while the stationary type electromagnetic cooker occupies the occupancy permitted for the cooker in the system kitchen It is only necessary to provide a volume, and the table-type electromagnetic cooker is required to be less expensive than the stationary electromagnetic cooker, and the matters to be taken into consideration are different.

  For this reason, a desktop type electromagnetic cooker having a plurality of heating units and an operating power supply of 200 V is often unable to cope without introducing an unprecedented technical idea, and a new technical idea for the electromagnetic cooker is required. ing.

  The first aspect of the present invention is characterized by including a housing formed of an insulator that operates at a power supply voltage higher than 100V.

  The second aspect of the present invention is an electromagnetic cooker including a plurality of heating units that perform a heating operation by passing an alternating current through an induction coil. (1) A component that supplies alternating current to the induction coil and an alternating current A printed wiring board on which a plurality of electronic components constituting a component for controlling supply is mounted is provided for each of the heating units, and (2) the plurality of printed wiring boards are hardware-like including the types of the mounted electronic components. Are characterized by the same configuration.

  In the second aspect of the present invention, each of the heating units includes a cooling fan, and a plurality of inverter circuits that convert a direct current formed from a commercial power source into an alternating current are provided on the front side of the device in the printed wiring board. It is preferable that a heat sink on which a power control semiconductor element is mounted is provided, and that a cooling airflow from the fan in charge of cooling the heating unit corresponding to the printed wiring board flows through the heat sink on the printed wiring board.

  In the second aspect of the present invention, it is preferable that the printed wiring board has one or more electronic components mounted behind the heat sink.

  In the second aspect of the present invention, each of the heating units includes a plurality of narrow plate-like magnetic bodies that define a magnetic flux path of an induction electromagnetic field in a direction not directed to a heating region among induction electromagnetic fields generated by the induction coil, Among the plurality of plate-like magnetic bodies provided for each heating unit, the plate-like magnetic body disposed at the position closest to the heat sink corresponding to the heating unit extends in a direction orthogonal to the parallel arrangement direction of the fins of the heat sink. The air flow from the corresponding fan is preferably diffused in the direction in which the fins of the heat sink are juxtaposed.

  In the first or second aspect of the present invention, it is preferable to operate using an external power source of 200 V as an operating power source.

  In the first or second aspect of the present invention, a portable desktop type is preferable.

  In the first or second aspect of the present invention, the number of the heating parts is preferably three.

  According to the present invention, since the printed wiring board provided for each heating unit has the same configuration, a low-cost electromagnetic cooker with a simple overall configuration can be realized.

It is a perspective view which shows the external appearance of the electromagnetic cooker of 1st Embodiment. It is the perspective view which excluded the top plate of the electromagnetic cooker of 1st Embodiment, and was made to see the inside of a housing | casing. It is a perspective view which excludes an induction coil and a shield ring from the display content of FIG. It is a perspective view which excludes the structure relevant to the attachment of an induction coil from the display content of FIG. It is a longitudinal cross-sectional view along the longitudinal direction of the coil receiving plate shown in FIG. 3 by which the induction coil is wound. FIG. 3 is a perspective view showing only the shield ring and its mounting structure, modified from FIG. 2. FIG. 6 is a perspective view showing only the shield ring and its mounting structure from FIG. It is a block diagram which shows the electrical structure etc. which are related to the heating operation in the electromagnetic cooker of 1st Embodiment. It is explanatory drawing which shows the arrangement | positioning of the key of a touchscreen area | region, light emitting element, etc. in the electromagnetic cooker of 1st Embodiment. It is a flowchart which shows the operation | movement at the time of the boiled food heating in the electromagnetic cooker of 1st Embodiment. It is a perspective view which shows the external appearance of the electromagnetic cooker of 2nd Embodiment. It is the perspective view which excluded the top plate of the electromagnetic cooker of 2nd Embodiment, and was made to see the inside of a housing | casing. It is a perspective view which shows the inner surface side of the upper cover in the electromagnetic cooking device of 2nd Embodiment. It is a perspective view which excludes the structure relevant to attachment of an induction coil and an induction coil from the display content of FIG. It is a block diagram which shows the electrical structure etc. which are related to the heating operation in the electromagnetic cooker of 2nd Embodiment. It is explanatory drawing which shows arrangement | positioning of the key of a touchscreen area | region, light emitting element, etc. in the electromagnetic cooker of 2nd Embodiment. It is a perspective view which shows the electromagnetic cooker mounting stand formed in order to mount the electromagnetic cooker of 2nd Embodiment (and the electromagnetic cooker of 1st Embodiment), and is marketed. It is a perspective view which shows the state which mounted the electromagnetic cooker of 2nd Embodiment on the mounting base for electromagnetic cookers.

(A) 1st Embodiment Hereafter, 1st Embodiment of the electromagnetic cooker by this invention is described, referring drawings. Here, the electromagnetic cooker according to the first embodiment includes three heating units using a commercial power source of 200 V (here, the heating unit includes only a heating unit for induction heating, such as a radiant heater, a halogen heater, etc. It is a table-type electromagnetic cooker having a term that does not include other heating units.

  FIG. 1 is a perspective view showing an appearance of the electromagnetic cooking device 1 according to the first embodiment. FIG. 1 is a perspective view in which the surface (upper surface) can be observed mainly.

  The electromagnetic cooker 1 of the first embodiment is generally in the shape of a thin rectangular parallelepiped box. The electromagnetic cooker 1 has a thickness of about 60 mm, for example. The electromagnetic cooker 1 mainly includes an upper lid 2 and a lower lid 3 (see FIGS. 2 to 4 described later), and the upper lid 2 covers the lower lid 3 (the side plate of the upper lid 2 is outside the wall portion of the lower lid 3). It is a box shape.

  The upper lid 2 includes a quadrangular top plate 4 and a skirt portion 5 formed around a side plate extending downward from the periphery of the top plate 4. The top plate 4 and the skirt portion 5 are separate members. On the upper side plate of the skirt portion 5, there is provided a top plate mounting portion for mounting and bonding the peripheral portion of the lower surface of the top plate 4, and the top plate 4 and the skirt portion 5 are integrated by bonding. An upper lid 2 is formed.

  The top plate 4 includes a region 6 that functions as a cooking container mounting unit for mounting a pan (not shown) for cooking, and a region 7 that functions as a touch panel.

  Three sets of two concentric circles are drawn on the surface of the cooking container placing portion region 6. Regions 6A, 6B, and 6C (hereinafter referred to as left region, right region, or back side region, or left heating unit, right heating unit, or back side heating unit) in which concentric circles are drawn are respectively distinguished. , Indicating that a different heating section is located below. Of the two concentric circles in each of the regions 6A, 6B, 6C, the circle with the smaller radius represents the outer periphery of a circle around which an induction coil, which will be described later, of the corresponding heating unit is wound, that is, the induction coil has a current. Represents a region where the electromagnetic induction action works by flowing. Thereby, the user can recognize the area | region where heating is performed effectively. The circle with the larger radius of the two concentric circles gives an indication of the diameter of the pan that can be heated by the corresponding heating unit, and the user can recognize the size of the pan that can be placed. .

  In the case of the electromagnetic cooker 1 of the first embodiment, the maximum power that can be supplied to the left heating unit 6A during heating is greater than the maximum power that can be supplied to the right heating unit 6B or the back heating unit 6C during heating. Moreover, the maximum electric power which can be supplied to the right heating unit 6B and the back side heating unit 6C during heating is the same. In addition, you may make it provide a difference in the maximum capability between the right heating unit 6B and the back side heating unit 6C, and in this case, the maximum capability of the right heating unit 6B located in front is increased. Is preferred.

  Here, it is conceivable to arrange the three heating units 6A to 6C in a straight line on the front side. However, when the three heating units are arranged in a straight line on the front side, the length of the electromagnetic cooker in the left-right direction becomes considerably long. Although it is a desktop type, it is used for cooking, and an electromagnetic cooker is placed and cooked at a height at which the user can easily cook. There are not many tables, desks, kitchen kitchens, etc. that can be equipped with electromagnetic cookers that are quite long in the left-right direction. In particular, the electromagnetic cooker 1 of the first embodiment is a desktop type, but uses a commercial power supply of 200 V as an operating power supply, and therefore is installed at a place where a kitchen cooker (not necessarily an electromagnetic cooker) is installed. It is conceivable to be placed and used, and one heating unit 6C is arranged on the back side so that the planar shape matches the planar shape of the location where the cooking device is installed in the kitchen as much as possible (described later). See Figure X1).

  Of the two concentric circles related to the left heating unit 6A, the right heating unit 6B, and the back side heating unit 6C, a circle having a smaller radius (direct heating region) is an arbitrary point on the circumference of the skirt portion 5 The distance from any one of the side surfaces is as long as a predetermined length (here, 10 cm) or more. For example, the small circle of the left heating unit 6A has the shortest distance from the left side surface of the skirt unit 5, but is longer than a predetermined length even at the shortest distance. Here, the predetermined length (10 cm) is legally required as the distance between the heating unit of a cooking table (not limited to an electromagnetic cooker) incorporated in the system kitchen and the adjacent wall surface. Distance (Electrical Appliance and Material Safety Law). Since the electromagnetic cooker 1 of the first embodiment, which is a tabletop type, is actually unclear as to where it is placed, the law intends no matter how it is placed. The above-described distance is secured so that a safe distance from the wall surface is secured.

  Although omitted in FIG. 1, letters and symbols such as “IH” are drawn at the center of two concentric circles indicating that the heating unit is located below, and the heating unit performs electromagnetic induction action. You may make it clearly show that it is the heating part utilized. In this case, it is possible to prevent the heating unit from giving the user a misunderstanding that the heating unit is caused by a radiant heater or a halogen heater.

  The touch panel region 7 is divided into a region 7A corresponding to the left heating unit 6A, a region 7B corresponding to the right heating unit 6B, and a region 7C corresponding to the back heating unit 6C. Details of the touch panel partial areas 7A, 7B, and 7C will be described later with reference to FIG.

  The top plate 4 having the cooking container placing portion region 6 and the touch panel region 7 is composed of a single glass plate. Thereby, the top surface of the top plate 4 can be a flat surface having no irregularities, and it is possible to prevent the top plate 4 from being damaged when placing or lowering the pan, Liquids spilled from pots can be easily wiped off. In addition, even if the surface of the top plate 4 is flat, various key switches and the like to be described later can be provided by processing the glass surface similar to a commercially available tablet terminal.

  Here, the power switch 8 is not provided in the touch panel region 7, but is provided at the position of the lower lid 3 below the front side plate of the upper lid 2 and at a position close to the right side plate of the upper lid 2. . When the touch panel region 7 is provided, there is a risk that a part of the body or utensil moving for cooking may accidentally touch the power switch. However, when it is provided at the above-mentioned position, such a fear is remarkably small. Become. Moreover, it is preferable from the operativity to provide in this side.

  FIG. 2 is a perspective view in which the top plate 4 is excluded so that the inside of the housing can be seen. FIG. 3 is a perspective view in which the induction coil and the shield ring are excluded from the display content of FIG. FIG. 4 is a perspective view showing the display contents of FIG. 3 excluding the configuration related to the attachment of the induction coil. In the drawings of the present application, the same and corresponding parts are denoted by the same reference numerals. Moreover, wiring is abbreviate | omitted in FIGS.

  The lower lid 3 has a quadrangular bottom plate, a step portion provided on the periphery of the bottom plate, and a wall portion standing upward from the periphery of the step portion, and the bottom plate, the step portion, and the wall portion, Is integrally molded.

  The inner surface of the side plate of the skirt portion 5 of the upper lid 2 and the outer surface of the wall portion of the lower lid 3 are adhered to each other, thereby completing the casing with the upper lid 2 and the lower lid 3. Here, while the electromagnetic cooker 1 has a thickness of about 60 mm, the width in the vertical direction (thickness direction) where the side plate of the skirt portion 5 of the upper lid 2 is in contact with the wall portion of the lower lid 3 is about half. is there.

  The bottom plate 9 of the lower lid 3 has three intake windows 11A, 11B, 11C (see FIG. 4) and an exhaust window 12. Each of the intake windows 11A, 11B, and 11C includes a central opening, a plurality of concentric annular members provided around the center opening, and a linear member extending radially in the radial direction. The intake windows 11A to 11C respectively take in ambient air into the casing and diffuse in the circumferential direction by rotation of corresponding fans 13A to 13C (see FIG. 4) described later. The exhaust window 12 is configured by arranging a plurality of slits side by side in the left-right direction, and is provided at a step portion that connects the bottom plate 9 and the back side wall portion. Ambient air is taken into the casing from the intake windows 11A, 11B, and 11C, and the air inside the casing is discharged from the exhaust window 12. Thus, a flow path of air flow for forcibly air-cooling the casing is provided. Is formed.

  Legs are respectively provided at the four corners of the bottom plate 9, and the electromagnetic cooker 1 is stably placed on a mounting plate (not shown) or the like (a kitchen cooking table (see FIG. X described later), a table top plate, etc.). It has been made possible.

  The electromagnetic cooker 1 uses 200 V as an operation power supply, but has a smaller thickness (for example, 590 mm × 500 mm × 60 mm) than the length in the left-right direction and the depth direction, and the center of gravity is close to the placement surface. It is an instrument, and a stable placement state can be realized. Further, as the top plate 4, glass having a thickness of about 4 mm is applied, and as the bottom plate 9, not a mere resin but a filler-containing resin filled with glass fibers (for example, glass-filled nylon; PA6 + FR15%) is applied. Therefore, a large weight can be obtained as compared with the volume of the housing, and a stable placement state can be realized. Further, by configuring the bottom plate 9 with a filler-containing resin filled with glass fibers, sufficient strength as the bottom plate 9 can be obtained, and mechanical resonance can be prevented. Incidentally, the upper lid 2 other than the top plate 4 is made of, for example, an alloy resin (PC + ABS) of polycarbonate and ABS, or polybutylene terephthalate (PBT), and satisfies the strength and heat resistance.

  As described above, synthetic resin is applied as the material of the upper lid 2 and the lower lid 3 excluding the top plate 3. Since a power supply voltage (preferably 200 V) greater than 100 V is used as an operating power supply, a ground wire is included in the power cord. The above-described synthetic resin has a high withstand voltage, and there is no need for a ground wire separate from the power cord. When the ground wire is omitted, unnecessary electromagnetic waves picked up by the ground wire can be prevented from being picked up.

  In addition, the synthetic resin casing used in the electromagnetic cooker 1 has a possibility of electric leakage even if the AC voltage at the time of dielectric breakdown is much higher than 200 V and cannot be grounded to the casing, as will be described later. Is low because it is made of synthetic resin. In addition, as a housing | casing, you may make it apply the other insulator which has the withstand voltage characteristic similar to a synthetic resin.

  Here, the AC voltage at the time of dielectric breakdown is defined as a voltage when a leakage current of 1 mA or more flows when the AC voltage is applied for 1 minute. The AC voltage at the time of dielectric breakdown of a case in which a coating film (paint film) is applied to a metal casing body by 10 μm is 400 V, and the AC voltage at the time of dielectric breakdown in a case in which a coating film is applied to the metal casing body by 50 μm. Is 3000 V, the AC voltage at the time of dielectric breakdown of the PC + ABS resin casing is 5000 V or more (the measurement upper limit of the measuring instrument is 5000 V), and the AC voltage at the breakdown of the resin casing made of PBT is 5000 V or more is there.

  The electromagnetic cooker 1 has a voice guidance function, and appropriately emits voice guidance and the like from a speaker. A sound emission window 14 that emits sound and sound produced by a speaker provided inside the housing is provided at the front center portion of the bottom plate 9. Of course, the electromagnetic cooker 1 may be configured not to have the voice guidance function.

  As described above, the top plate mounting portion 20 for mounting and bonding the peripheral portion of the lower surface of the top plate 4 (not shown in FIGS. 2 to 4) on the upper side plate of the skirt portion 5 of the upper lid 2 is provided. Is provided. A region 21 on the near side of the top plate placement unit 20 is a region corresponding to the touch panel region 7 described above. This touch panel corresponding area 21 is a small window for visually recognizing the light emitting element (for example, LED) provided below, informing the operation state related to each heating unit, description of characters and figures representing the function of the key, A display area or the like is provided for notifying the timer time.

  The induction coils 22A, 22B, and 22C, which are the central components of the left heating unit 6A, the right heating unit 6B, and the back heating unit 6C described above, are fixed at a position below the circle with the small radius of the concentric circle set described above. Has been.

  Each induction coil 22A, 22B, 22C generates a magnetic flux around the coil due to a high frequency (for example, several tens of thousands Hz) alternating current from a corresponding inverter circuit (see reference numerals 43A to 43C in FIG. 6 described later). When the magnetic flux passes through the metal pan, an infinite number of eddy currents are generated inside the pan, and when the eddy current flows, heat is generated by the electric resistance at the bottom of the pan and is heated by the heat.

  The induction coils 22A, 22B, and 22C are attached to the corresponding coil fixtures 23A, 23B, and 23C, respectively. Hereinafter, although the coil fixture 23B of the induction coil 22B will be taken up and described, the coil fixtures 23A and 23C of the induction coils 22A and 22C have the same configuration.

  As shown in FIG. 3, the coil fixture 23 </ b> B has a small-diameter annular portion 24, a large-diameter annular portion 25, and equal intervals in the circumferential direction connecting the annular portions 24 and 25 (example of FIG. 3). (Fig. 3 shows six examples) coil receiving plates 26-1 to 26-6 and a large-diameter annular portion 25 extending radially outward. A plurality of supporting protrusions 27-1 to 27-3 (FIG. 2 shows three examples) provided at equal intervals in the circumferential direction (the example of FIG. 3 is an interval of 120 °), Supporting bases 28-1 to 28-3, which are erected upward from the bottom plate 9 and fix the corresponding supporting protrusions 27-1 to 27-3 at the upper ends with screws 29-1 to 29-3. Here, the annular portions 24 and 25, the coil receiving plates 26-1 to 26-6, and the supporting projections 27-1 to 27-3 are integrally formed.

  The inside of the small-diameter annular portion 24 is a place where a temperature sensor (thermistor) (not shown) for measuring the temperature of the back surface of the top plate 4 (temperature at the heating center of the heating portion 6B) is arranged. That is, the temperature at the time of heating can be measured by not winding the induction coil 22B until the center of the heating unit 6B.

  FIG. 5 is a longitudinal sectional view taken along a line connecting the supporting projection 27-1 and the center of the coil fixture 23B. Along the line, a coil receiving plate 26-1 is also present. In addition, unlike FIG. 3, FIG. 5 also shows a shield ring described later.

  As can be understood from the cross-sectional view of FIG. 5, each of the coil receiving plates 26-1 to 26-6 includes the substrate 30 and the coil fixture 23 </ b> B that is erected on the substrate 30 at a constant pitch in the radial direction. A plurality of arc-shaped pleats 31 centering on the center are provided. The length of the pleat piece 31 in the vertical direction is selected to be twice or more than the diameter of the induction coil 22B. The induction coil 22B is wound in two layers (double) in the vertical direction so as to sequentially pass between adjacent pleat pieces 31 in each of the coil receiving plates 26-1 to 26-6.

  When a 200V commercial power source is used as an operating power source, the maximum capacity during heating in each of the heating units 6A, 6B, and 6C can be set larger than when a 100V commercial power source is used as an operating power source. When a commercial power supply of 200V is used as an operation power supply, the induction electromagnetic field formed by the induction coils 22A, 22B, and 22C is also increased. In order to realize such a large induction electromagnetic field, two layers of induction coils 22A, 22B, and 22C are employed in the first embodiment. As an induction coil, it is possible to realize a large induction electromagnetic field by increasing the number of strands and twisting a large number of strands to achieve a large induction electromagnetic field. 22B and 22C are difficult to bend and are inconvenient to handle. Although it is conceivable to integrate a large number of strands with resin or the like to realize a large induction electromagnetic field, there are also disadvantages in that the handling is inconvenient and the cost is increased.

  When a large induction electromagnetic field is realized by winding an induction coil having a not so large diameter (about 4 mm) in two layers as in the first embodiment, a heating region (see a small concentric circle in FIG. 1). Can be easily handled during winding, and the costs associated with the induction coils 22A, 22B, and 22C can be reduced.

  The integrally formed portions of the coil fixtures 23A, 23B, and 23C are formed of resin or the like so as not to adversely affect the induction electromagnetic field created by the induction coils 22A, 22B, and 22C.

  As shown in FIG. 5, each of the back surfaces of the coil receiving plates 26-1 to 26-6 in the coil attachment 23 </ b> B is thin and has the same length and width as the coil receiving plates 26-1 to 26-6. A magnetic member (for example, a ferrite core) 32 is provided (the magnetic member and the coil fixture are laminated). Similarly, the magnetic body members 32 are provided below the coil receiving plates in the coil fixtures 23A and 23C, respectively.

  Each magnetic member 32 forms a magnetic flux path passing through the opposite side of the heating part (6A, 6B, 6C) in the induction electromagnetic field created by the induction coil (22A, 22B, 22C), and the induction electromagnetic field is stable. It is an attempt to realize the formation. Of the plurality (six) of magnetic members 32 for each induction coil 22A, 22B, 22C, the magnetic member 32 closest to the heat sink described later (for example, in the case of the induction coil 22B, the coil receiving plate 26). The magnetic member provided on the back surface of −5 extends in a direction substantially orthogonal to the extending direction of the fins of the heat sink. By extending in such a direction, the cooling airflow formed by the corresponding fan is disturbed, the cooling airflow is dispersed in the width direction of the heat sink (the direction in which the fins are juxtaposed), and the cooling airflow passes through all the fins. Thus, the cooling efficiency can be increased.

  In the case of the first embodiment, as shown in FIG. 2, shield rings 33A and 33B are provided for the heating units 6A and 6B. In addition, you may make it provide the shield ring 33C also with respect to the heating part 6C.

  The shield rings 33A and 33B prevent the induction electromagnetic field generated by the induction coils 22A and 22B from moving outside the heating region. Since each heating unit 6A, 6B is operated using a 200V commercial power source as an operating power source, the maximum heating capacity of each heating unit 6A, 6B is higher than that when a 100V commercial power source is used as an operating power source. The induction electromagnetic field during heating at close heating capacity is quite large. Therefore, the shield rings 33A and 33B are provided to prevent the induction electromagnetic field from the induction coils 22A and 22B from going outside the heating region. The shield ring 33A prevents the flow of electromagnetic field in the direction connecting the heating units 6A and 6C, and the shield ring 33B prevents the flow of electromagnetic field in the direction connecting the heating units 6B and 6C. Thus, the shield ring 33C for the heating unit 6C can be omitted.

  The shield rings 33A and 33B shield the electromagnetic field toward the outside of the heating region by separating and enclosing a large-diameter annular portion (see reference numeral 25 in FIG. 3) in the coil fixtures 23A and 23B. .

  As shown in FIG. 5, the main body 34 of the shield ring 33 is formed by ringing a metal wire (for example, aluminum) having a solid circular shape with a diameter of about 4 mm and welding (brazing) both ends thereof to form a ring. Is. Instead of welding, other endless methods may be applied. For example, both ends of the wire may be fitted to a cylindrical member having a diameter slightly larger than that of the wire so as to be endless. Ring attachment pieces 35 are provided at positions of the ring main body 34 that equally divides the circumferential direction into three parts (see FIG. 3), and these ring attachment pieces 35 are supported by the coil attachment 23 (23A, 23B) described above. It is fixed to the top of the table (see reference numerals 28-1 to 28-3 in FIG. 3) with screws (see reference numerals 29-1 to 29-3 in FIG. 3). When the ring body 34 is formed into a ring shape, the heat treatment is performed through a heat-shrinkable vinyl chloride pipe. After the ring body 34 is formed into a ring shape, the position of the vinyl chloride pipe is adjusted so as to cover the joints at both ends. Shrink. The thus formed vinyl chloride covering portion 36 is positioned at a position where it comes into contact with the wiring or the like. Even if the wiring covering is damaged when it comes into contact with the wiring, the leakage current is prevented from flowing. .

  As the ring body 34, it is conceivable to use a hollow body instead of a solid body. However, the hollow body and the solid body have a greatly different distribution of electrical resistance depending on the depth from the surface, and there is a difference in shielding ability. Since it is large, it was decided to apply a solid one as described above.

  In the above description, the ring body 34 using a wire having a circular cross section has been described. However, the ring body 34 may have other shapes. For example, the ring main body 34 may be configured in a plate-like annular shape, and FIGS. 6 and 7 each show a case where such a plate-like ring main body 34 is applied. . For example, the ring main body 34 that is a plate-shaped annular member can be formed by punching a metal flat plate. In the case of the plate-like ring-shaped ring main body 34, the shielding effect can be further enhanced by increasing the width (the length in the radial direction) of the plate (for example, the length within a range of 5 mm to 20 mm). it can. In the case of the plate-shaped ring-shaped ring body 34, the shield ring 33 is fixed to the uppermost portion of the support base (see 28-1 to 28-3 in FIG. 3) in the coil fixtures 23A and 23B. Instead, a fixing method of attaching to the inner surface of the top plate 4 can also be applied (see the second embodiment described later). When this fixing method is applied, the covering portion 34 of vinyl chloride can be omitted.

  In order to intake air through the intake windows 11A, 11B, and 11C described above, fans 13A, 13B, and 13C are provided corresponding to the intake windows 11A, 11B, and 11C, respectively. Wall portions are provided so as to stand upward from substantially semicircles of the outer peripheral circles of the intake windows 11A, 11B, and 11C, and a bridge plate that passes through the upper center of the outer peripheral circle is provided at each upper portion of each wall portion. It has been. Corresponding fans 13A, 13B, and 13C are attached to the center of the lower surface of each bridge plate.

  The direction of the rotation axis of each fan 13A, 13B, 13C is the normal direction of the center of the corresponding circular induction coil 22A, 22B, 22C (in other words, the heating unit) that the fans 13A, 13B, 13C are responsible for cooling. It is off. When the rotation axis directions of the fans 13A, 13B, and 13C coincide with the central normal directions of the corresponding induction coils 22A, 22B, and 22C, the flow caused by the intake air is in all directions and does not go to the exhaust window 12. Although a flow is likely to occur, the above-described axial shift makes it easy to create an air flow toward the exhaust window 12 below the induction coils 22A, 22B, and 22C.

  In the case of the first embodiment, as the fans 13A, 13B, and 13C, the airflow sucked up and down by the blade shape is diffused in the circumferential direction without applying the intake airflow to the top plate 4 or the like to diverge. Since the thing is applied, even if the intake power in the vertical direction is somewhat low, the cooling capacity is sufficient. Therefore, the fan 13A, 13B, 13C having a smaller blade diameter than the diameter of the circular region around which the induction coils 22A, 22B, 22C to be cooled are wound is applied, and the necessary occupation for the fans 13A, 13B, 13C is applied. The area is reduced.

  Here, since the number of fans 13A, 13B, and 13C is made the same as the number of induction coils 22A, 22B, and 22C, sufficient cooling can be achieved. Moreover, as mentioned above, a small fan can be applied as each fan, and the entire size of the electromagnetic cooker 1 can be reduced and simplified.

  FIG. 8 is a block diagram showing an electrical configuration and the like related to the heating operation in the electromagnetic cooker 1.

  The power supplied by the 200V commercial power supply 40 is distributed by the power distributor 41 to the processing series of the heating units 6A, 6B, and 6C. The alternating current generated by the power distribution to each series is converted into a direct current by the rectifier circuits 42A, 42B, and 42C of the series and is supplied to the corresponding inverter circuits 43A, 43B, and 43C, and the high frequency is generated by the inverter circuits 43A, 43B, and 43C. AC current is generated and supplied to the induction coils 22A, 22B, 22C to generate an alternating magnetic field as appropriate, and the pan facing the induction coils 22A, 22B, 22C is self-heated with the top plate 4 interposed therebetween. Has been made.

  In order to control the operation of the inverter circuits 43A, 43B, and 43C, heating control units 44A, 44B, and 44C are provided in each series. The heating control units 44A, 44B, and 44C include, for example, a CPU, a ROM (may be a rewritable ROM such as an EEPROM), a RAM (of course, may include other memory elements), and the like. It is composed of a microcomputer equipped. The heating control units 44A, 44B, and 44C are connected to the corresponding touch panel partial areas 7A, 7B, and 7C for the heating units 6A, 6B, and 6C, respectively, and take in key inputs and perform lighting control of lamps and the like. To do. Although omitted in FIG. 8, the heating control units 44A, 44B, and 44C are also in charge of on / off control of the fans 13A, 13B, and 13C corresponding to each series.

  The power distributor 41 is configured by, for example, a relay sequence, and the heating control units 44A, 44B, and 44C distribute power by performing on / off control of the corresponding relays according to the operation state.

  Each of the inverter circuits 43A, 43B, and 43C applies a plurality of semiconductor elements for switching for power control, and converts a direct current into an alternating current having a predetermined frequency. For example, an insulated gate bipolar transistor (IGBT) is used as the semiconductor element for power control. Since the IGBT is switched at a high frequency, the IGBT generates a large amount of heat during operation.

  Electronic components constituting the rectifier circuit 42A, the inverter circuit 43A, and the heating control unit 44A for the heating unit 6A (the term electronic component here refers to not only an elemental component that performs electronic processing, but also a larger component) Most of them are mounted on a printed wiring board 45A shown in FIG. Similarly, most of the electronic components constituting the rectifying circuit 42B, the inverter circuit 43B, and the heating control unit 44B for the heating unit 6B are mounted on the printed circuit board 45B, and the rectifying circuit 42C and the inverter circuit for the heating unit 6C. 43C and most of the electronic components constituting the heating control unit 44C are mounted on the printed wiring board 45C.

  The printed circuit boards 45A to 45C on which these three electronic components and the like are mounted have the same configuration as can be understood from FIG. Note that although the programs recorded in the ROM or RAM executed by the CPU constituting the heating control unit 44A are different, the appearance is the same. Therefore, the printed wiring boards 45A to 45C can be formed on a similar production line. Since the heating stage and the like differ depending on the heating units 6A, 6B, and 6C, an over-spec printed circuit board is also generated, but the manufacturing cost can be suppressed by the ease of manufacturing and the sharing of parts. Also, each printed wiring board 45A, 45B, 45C can be applied to the heating part of an electromagnetic cooker with one heating part, and the heating part can also be used for each heating part of two electromagnetic cookers. It has a general-purpose configuration that can be applied.

  Incidentally, unlike the first embodiment, it is possible to mount electronic components for different heating parts on one printed wiring board, but in this case, since the operation timing of the electronic parts differs depending on the heating part, Mutual unnecessary radiation may act on the wiring and oscillate electrically. However, when the printed wiring boards 45A, 45B, 45C are provided in association with the heating units 6A, 6B, 6C, The fear can be very small.

  As can be seen from FIG. 4, heat sinks 46 </ b> A, 46 </ b> B, and 46 </ b> C are provided on the left and right sides of the printed wiring boards 45 </ b> A, 45 </ b> B, and 45 </ b> C and in the depth direction. Each of the heat sinks 46A, 46B, 46C includes a substrate, a plurality of fins extending in the depth direction integrally provided on the upper portion, and a smaller number of fins than the upper portion extending in the depth direction integrally provided on the lower portion of the substrate. And have. A plurality of IGBTs that constitute the inverter circuits 43A, 43B, and 43C are mounted at the center of the heat sinks 46A, 46B, and 46C in the left and right direction where fins are not provided.

  By providing the heat sinks 46A, 46B, and 46C on the front side of the printed wiring boards 45A, 45B, and 45C and increasing the weight on the front side, the airflow formed by the rotation of the fans 13A, 13B, and 13C is changed to the printed wiring board 45A, Even if it hits the edge on the near side of 45B and 45C, the vicinity of the edge can be prevented from vibrating up and down and wind noise caused by vibration can be suppressed. Also, by providing the heat sinks 46A, 46B, 46C on the front side of the printed wiring boards 45A, 45B, 45C, one or more electronic components having a large amount of heat generation can be mounted on the back side of the heat sinks 46A, 46B, 46C. Electronic components can be efficiently cooled.

  Since the electromagnetic cooking device 1 of the first embodiment is portable, it is preferable that the user can easily lift it. In general, a user grips and lifts the vicinity of a position half the length of the left and right side plates in FIG. 1 with both hands. In this case, if the weight is different between the front half and the back half, the lifted electromagnetic cooker falls to the front or back and becomes unstable. Therefore, it is preferable that the weight of the front half and the weight of the back half are substantially equal. Some users may hold both the hands in the vicinity of the position in the left and right half of the front and back side plates in FIG. In this case, if the left half and the right half have different weights, the lifted electromagnetic cooker falls to the left or right and becomes unstable. Therefore, it is preferable that the weight of the left half and the weight of the right half are substantially equal.

  That is, in the portable electromagnetic cooker, it is preferable that the weight of the front half and the weight of the back half are approximately equal, and the weight of the left half and the weight of the right half are approximately equal. Realizing this in consideration of the size and position of each heating unit and the weight of each electronic component is a very difficult task in terms of design. As in the first embodiment, printed circuit boards 45A, 45B, and 45C on which many electronic components are mounted are provided in association with the heating units 6A, 6B, and 6C, and the printed circuit boards 45A, 45B, and 45C are shared. In this case, the balance between the horizontal direction and the depth direction is taken into consideration in consideration of the weight of the printed wiring boards 45A, 45B, and 45C. Therefore, even if the size and position of each heating unit are taken into consideration, the balance Therefore, the electromagnetic cooker 1 can be realized with a good balance between the left-right direction and the depth direction.

  FIG. 4 shows the three heat sinks 46A, 46B, 46C having the same length in the depth direction, but the heat sinks 46A, 46B, 46C have different depth lengths (in other words, fin lengths). May be. For example, the length in the depth direction of the heat sinks 46A, 46B, 46C may be selected according to the maximum heating capacity of the heating units 6A, 6B, 6C. Also in this case, the length in the depth direction is constant for mounting the heat sinks 46A, 46B, and 46C on the printed wiring boards 45A, 45B, and 45C. And about the heat sink whose length in the depth direction is longer than this mounting length, a part of the heat sink protrudes from the front edge of the printed wiring board. Thereby, the identity of the printed wiring boards 45A, 45B, 45C other than the heat sinks 46A, 46B, 46C can be ensured.

  FIG. 9 is an explanatory diagram showing the arrangement of key switches (hereinafter simply referred to as keys) and light emitting elements in the touch panel area 7.

  As described above, the touch panel region 7 is divided into the region 7A related to the left heating unit 6A, the region 7B related to the right heating unit 6B, and the region 7C related to the back side heating unit 6C.

  The left heating unit touch panel area 7A includes a “heating” key 50 for instructing normal heating on (on) and off (off) in the left heating unit 6A, and hot water heating on (on) and off (off) in the left heating unit 6A. ) Instructing the “heating” key 51, the “fried food” key 52 instructing on (off) / off (turning off) fried food heating in the left heating unit 6 A, and the steps of normal heating and fried food heating in the left heating unit 6 A “Strength” key 53 for instructing to increase by one level, “Weak” key 54 for instructing to decrease the level of normal heating or deep-fried food heating in left heating unit 6A by one step, and a timer timing in left heating unit 6A Is provided with a “+” key 55 for instructing to lengthen the time by one unit, and a “−” key 56 for instructing to shorten the time measured by the timer in the left heating section 6A by one unit.

  In addition, the left heating unit touch panel region 7A indicates that the light emitting element 57 indicating that normal heating is selected, the light emitting element 58 indicating that kettle heating is selected, and fried food heating are selected. A light-emitting element 59 to be displayed, a stage display unit 60 including nine light-emitting elements for displaying a stage selected by normal heating or deep-fried food heating, and a numerical display unit for displaying the remaining time of the timer, the temperature during frying food heating, and the like 61. The number display unit 61 also includes an indicator that indicates whether the displayed number is the remaining time of the timer or the temperature during heating of the deep-fried food.

  The right heating unit touch panel area 7B includes a “heating” key 62 for instructing on (on) / off (off) normal heating in the right heating unit 6B, and on (on) off (off) of boiled food heating in the right heating unit 6B. ) To indicate that the normal heating step in the right heating unit 6B is to be increased by one step, and to decrease the normal heating step in the right heating unit 6B by one step. “Weak” key 65 for instructing, “+” key 66 for instructing to increase the timer timing in the right heating unit 6B by one unit, and the timer timing in the right heating unit 6B by one unit A “−” key 67 for instructing shortening is provided.

  The right heating unit touch panel region 7B includes a light emitting element 68 indicating that normal heating is selected, a light emitting element 69 indicating that boiled food heating is selected, and a stage selected by normal heating. It has a stage display unit 70 composed of eight light emitting elements for display, and a number display unit 71 for displaying the remaining time of the timer.

  The back side heating unit touch panel region 7C raises the “heating” key 72 for instructing on (on) / off (off) heating in the back side heating unit 6C and the normal heating stage in the back side heating unit 6C by one step. “Strong” key 73 for instructing, “weak” key 74 for instructing to lower the normal heating stage in the back side heating unit 6C by one step, and the time measured by the timer in the back side heating unit 6C by one unit A “+” key 75 for instructing to increase the time by a predetermined amount, and a “−” key 76 for instructing to shorten the time measured by the timer in the back side heating unit 6C by one unit.

  The back side heating unit touch panel region 7C includes a light emitting element 77 indicating that normal heating is selected, and a stage display unit 78 including eight light emitting elements that display the stage selected by normal heating. And a number display unit 79 for displaying the remaining time of the timer.

  In addition, the touch panel region 7 is also provided with a light emitting element 80 that indicates the on / off state of the power switch, and a light emitting element 81 for urging attention to “high temperature” determined from an operation mode, a heating stage of a predetermined heating unit, and the like. .

  Next, the operation | movement at the time of the boiled food which the heating control part 44B of the right heating part 6B performs is demonstrated. FIG. 10 is a flowchart showing the operation at the time of heating the boiled food. In FIG. 10, lighting control of the light emitting element is omitted.

  When the “boiled food” key 63 is operated, the control unit 44B starts the processing shown in FIG. First, the control unit 44B heats the left heating unit 6A with the initial power consumption P1 during the cooking of the boiled food, and starts counting with a built-in timer (step S100).

  When the first predetermined time T1 that is determined in advance is reached, the control unit 44B takes in and detects the temperature detected by the temperature sensor (step S101). When the detected temperature is equal to or lower than the first threshold temperature C1 while heating for the first predetermined time T1, the control unit 44B performs a stop process or the like as a heating abnormality (step S102). When the detected temperature is higher than the second threshold temperature C2 that is higher than the first threshold temperature C1, the control unit 44B switches to heating with the power consumption P2 for stable heating that is lower than the initial power consumption P1 (step S103). When the measured time has elapsed after the first predetermined time T1, if the detected temperature is greater than the first threshold temperature C1 and not more than the second threshold temperature C2, the control unit 44B continues the heating operation with the initial power consumption P1. Let

  When the time measured from the heating start time reaches a second predetermined time T2 (T2> T1) that is determined in advance, the control unit 44B detects that the temperature sensor exceeds the third threshold temperature C3 (C3> C2). It is determined whether or not (step S104). When the detected temperature is higher than the third threshold temperature C3, the control unit 44B switches to heating with the power consumption P2 for stable heating (step S103). When the measured time is equal to or lower than the third threshold temperature C3 when the second predetermined time T2 has elapsed, the control unit 44B continues the heating operation with the initial power consumption P1.

  Thereafter, the control unit 44B monitors whether the temperature detected by the temperature sensor exceeds the fourth threshold temperature C4 (C4> C3) (step S105). When the detected temperature is higher than the fourth threshold temperature C4, the control unit 44B switches to heating with the power consumption P2 for stable heating (step S103). On the other hand, when the measured time reaches the third predetermined time T3 (T3> T2) without the detected temperature becoming higher than the fourth threshold temperature C4, the control unit 44B performs heating with the power consumption P2 for stable heating. (Step S103).

  After switching to heating with the power consumption P2 for stable heating, the control unit 44B controls the measured temperature to be within a very narrow temperature range of C5 to C6. That is, the control unit 44B stops heating when the temperature detected by the temperature sensor exceeds the fifth threshold temperature C5, and stable heating is performed when the temperature detected by the temperature sensor falls below the sixth threshold temperature C6 (C6 <C5). Heating with the power consumption P2 is resumed (steps S106 to S109).

  When the “boiled food” key 63 is operated during the execution of the boiled food shown in FIG. 10 and the end of the boiled food is instructed, the control unit 44B ends the boiled food heating.

  Although the threshold temperature, predetermined time, power consumption during heating, etc. differ between boiling water heating and boiled food heating, the processing before switching to heating with power consumption for stable heating is the same, making it easy to create a processing program It is. In the case of boiling water heating, the heating is automatically terminated when a predetermined time elapses after the first transition to heating with power consumption for stable heating. In the case of boiling water, it is only necessary to boil hot water, but the boiled food needs to be boiled even after reaching a predetermined temperature, and the temperature maintaining operation is performed.

  In the case of the first embodiment, the simmered food heating threshold temperatures C1 to C6, the predetermined times T1 to T3, and the power consumption P1 and P2 during heating are set to a temperature suitable for the simmered food (a temperature lower than the boiling temperature). It is selected to a value that gradually increases over time until it reaches a temperature suitable for boiled food, and maintains that temperature (or the vicinity temperature).

  That is, it is possible to perform heating suitable for the boiled food without changing the heating stage appropriately while the user is aware of the boiled food.

  According to the first embodiment, since the electromagnetic cooker 1 is a desktop type and uses a 200 V commercial power supply as an operating power supply, it can be used by being placed at a place where the kitchen cooker is installed. Moreover, it has the external shape suitable for mounting in such a location.

  According to the first embodiment, the power cord may not include the ground wire by selecting the housing resin. If the ground wire is omitted, unnecessary electromagnetic waves picked up by the ground wire are removed. You can avoid picking it up. The case to which the selected resin is applied has an AC voltage significantly higher than 200 V at the time of dielectric breakdown, and it is unlikely that a current due to dielectric breakdown flows even if the case cannot be grounded.

  According to the first embodiment, since the induction coil is provided by being wound in two layers (double) in the vertical direction, even if the maximum heating capacity of the heating unit is increased by using a 200 V commercial power supply as an operating power supply. A large induction electromagnetic field commensurate with it can be easily realized at low cost.

  According to the first embodiment, the magnetic member closest to the heat sink among the magnetic members (ferrite cores) extends in a direction substantially orthogonal to the extension direction (depth direction) of the fins of the heat sink. Since the magnetic material member disturbs the cooling airflow formed by the corresponding fan, the cooling airflow is distributed in the width direction of the heat sink (the fins are arranged side by side), so that the cooling airflow passes through all the fins. Therefore, the cooling efficiency can be increased.

  According to the first embodiment, since some of the induction coils (or all induction coils) are surrounded by the shield ring, an induction electromagnetic field that is not directed to the heating area by the induction coil is blocked. can do. When a commercial power supply of 200V is used as the operating power supply, the induction electromagnetic field is also large, so the effect of providing the shield ring is great. Here, since the shield ring is made of a solid metal wire having a circular cross section, a larger shielding effect can be exhibited than when a hollow one is applied. In addition, since the shield ring is provided with a covering portion made of an insulator, it is possible to prevent a leakage current from flowing even if it comes into contact with the wiring.

  According to the first embodiment, as a fan, a fan that diffuses an airflow sucked in a vertical direction by a blade shape in a circumferential direction without applying an intake airflow to a top plate or the like to diverge is applied. Therefore, even if the intake force in the vertical direction is somewhat low, sufficient cooling capacity can be exhibited. Therefore, it is possible to apply a fan whose fan blade diameter is smaller than the diameter of the circular region around which the induction coil to be cooled is wound, and the occupied area necessary for the fan can be suppressed.

  According to the first embodiment, each heating unit is provided with a printed wiring board on which electronic components related to heating control are mounted, and these printed wiring boards are made the same. Sharing can be achieved and manufacturing costs can be reduced. Moreover, since the printed wiring board is provided for each heating unit, electronic components of a plurality of heating units are not mixed in one printed wiring board, and unnecessary oscillation and vibration can be suppressed.

  According to the first embodiment, since the heat sink is mounted on the front side of the printed wiring board to increase the weight on the front side, the airflow formed by the rotation of the fan strikes the edge on the front side of the printed wiring board. Even so, it can be prevented that the vicinity of the edge vibrates up and down, and wind noise caused by the vibration can be suppressed. Further, by providing the heat sink on the front side of the printed circuit board, one or more electronic components having a large amount of heat generation can be mounted on the back side of the heat sink, and these electronic components can be efficiently cooled.

  The electromagnetic cooker according to the first embodiment can easily optimize the weight distribution due to the arrangement relationship of the three heating units and the common use of a plurality of printed wiring boards, and the weight of the front half and the back half. Are substantially equal, and the weight of the left half and the weight of the right half can be made substantially equal. As a result, when the user grips and lifts the central part of the two side plates in the left-right direction or the central part of the two side plates in the depth direction, the user can lift the tilted parts without tilting.

  According to the first embodiment, since the boiled food heating mode is provided, heating suitable for boiled food heating can be performed without placing a burden on the user when selecting boiled food heating.

(B) 2nd Embodiment Next, 2nd Embodiment of the electromagnetic cooker by this invention is described, referring drawings. Here, the electromagnetic cooking device which concerns on 1st Embodiment has the desktop type which has two heating parts (only the induction heating part is included similarly to 1st Embodiment) using 200V commercial power supply. This is an electromagnetic cooker.

  The electromagnetic cooker 1X according to the second embodiment and the electromagnetic cooker 1 according to the first embodiment are different in the number of heating units, but often have a common technical idea, and are described below. Then, the electromagnetic cooker 1X which concerns on 2nd Embodiment is demonstrated centering on a technical idea in common.

  FIG. 11 is a perspective view showing an external appearance of the electromagnetic cooking device 1X according to the second embodiment, and is a drawing corresponding to FIG. 1 according to the first embodiment. , The corresponding symbols are attached.

  The electromagnetic cooker 1X of the second embodiment has, for example, a generally rectangular parallelepiped box shape in which the horizontal direction is 590 mm, the depth direction is 500 mm, and the thickness is 60 mm. The electromagnetic cooker 1X also mainly includes an upper lid 2 and a lower lid 3. The upper lid 2 includes a quadrangular top plate 4 and a skirt portion 5 formed around a side plate extending downward from the periphery of the top plate 4. The lower lid 3 includes a quadrangular bottom plate 9, a step portion 10 provided on the periphery of the bottom plate 9, and a wall portion standing upward from the periphery of the step portion 10.

  The top plate 4 has a cooking container placement area 6 and a touch panel area 7.

  In the case of the second embodiment, since there are two heating parts, two sets of two concentric circles are drawn on the surface of the cooking container placing part region 6. Regions 6D and 6E (hereinafter referred to as the left region or the right region, or the left heating unit or the right heating unit, respectively) in which concentric circles are drawn are respectively located below the different heating units. It represents that. In the case of the electromagnetic cooker 1X of the second embodiment, the maximum power that can be supplied to the left heating unit 6D during heating is greater than the maximum power that can be supplied to the right heating unit 6E during heating.

  In both the left heating part 6D and the right heating part 6E, the distance between an arbitrary point on the circumference of the heating area circle and any side surface of the skirt part 5 is longer than a predetermined length (here, 10 cm). ing. Similarly to the first embodiment, this is to ensure a legally required distance between the heating unit and the adjacent wall surface no matter how the electromagnetic cooker 1X is placed. is there.

  Although omitted in FIG. 11, letters and symbols such as “IH” are drawn at the center of two concentric circles indicating that the heating unit is located below, and the heating unit performs electromagnetic induction action. You may make it clearly show that it is the heating part utilized.

  The touch panel region 7 is divided into a region 7D of the left heating unit 6D and a region 7E of the right heating unit 6E. Details of the touch panel partial areas 7D and 7E will be described later with reference to FIG. XX.

  The top plate 4 having the cooking container placing portion region 6 and the touch panel region 7 is configured by a single glass plate for the same reason as in the first embodiment. Also in the second embodiment, the power switch 8 is provided at the position of the lower lid 3 below the front side plate of the upper lid 2 and close to the right side plate of the upper lid 2. Also in the second embodiment, while the electromagnetic cooker 1X has a thickness of about 60 mm, the vertical direction (thickness direction) in which the side plate of the skirt portion 5 of the upper lid 2 and the wall portion of the lower lid 3 are in contact with each other. ) Is selected to be about half the width.

  FIG. 12 is a perspective view in which the top plate 4 is excluded and the inside of the housing can be seen. FIG. 12 shows only the induction coil 22E of the right heating unit 6E, excluding the induction coil (not shown, but using reference numeral 22D) for the left heating unit 6D. However, the illustration of the induction coil 22E is not exact, and is described as an image in which the induction coil 22E is mounted.

  Also in the second embodiment, a top plate mounting portion 20 for mounting and adhering the peripheral portion of the lower surface of the top plate 4 (not shown in FIG. 12) on the side plate upper portion of the skirt portion 5 of the upper lid 2 is provided. Is provided. The area 21 on the near side of the top plate mounting portion 20 is an area corresponding to the touch panel area 7 in the second embodiment.

  In the second embodiment, unlike the first embodiment, the center in the left-right direction of the top plate mounting portion 20 above the back side plate and the center in the left-right direction of the near side region 21 of the top plate mounting portion 20 Are connected to the top plate mounting portion 20. The bridging portion 15 supports the top plate 4 (the back surface thereof) and has a function of dividing the region of the back surface of the top plate 4 in the left-right direction. In the case of the second embodiment, the configuration on the left side and the configuration on the right side across the bridging portion 15 are generally the same configuration such that when one configuration is translated, it overlaps the other configuration.

  Inductive coils 22D and 22E, which are central components of the left heating unit 6D and the right heating unit 6E, are fixed at positions below the circle with the small radius of the concentric circle set. Also in 2nd Embodiment, induction coil 22D, 22E is attached in the state wound by double similarly to 1st Embodiment.

  On the other hand, unlike the first embodiment, the second embodiment is not provided with a shield ring (see reference numerals 33A and 33B in FIG. 2) surrounding the induction coils 22D and 22E. In the case of the second embodiment, a metal plate (for example, an aluminum plate) performs the same function as the shield ring.

  FIG. 13 is a perspective view showing the inner surface side of the upper lid 2 in the electromagnetic cooking device 1X of the second embodiment.

  The metal plate 16D on the right side (corresponding to the left side of FIG. 11) in FIG. 13 shields the induction electromagnetic field from the induction coil 22D, and the metal plate 16E on the left side (corresponding to the right side of FIG. 11) in FIG. The electromagnetic field from the induction coil 22E is shielded. Each of the metal plates 16D and 16E has a rectangular shape slightly smaller than the rectangular shape obtained by dividing the electromagnetic cooker 1X in the left-right direction, and has circular through holes 17D and 17E at the center thereof. The outer peripheries of the respective through holes 17D and 17E surround the outer diameters of the corresponding induction coils 22D and 22E that are fixed. Thereby, among the induction electromagnetic fields formed by the induction coils 22D and 22E, it is possible to shield the induction electromagnetic fields directed outward from the heating units 6D and 6E.

  Although FIG. 13 shows that the metal plates 16D and 16E provided on the inner surface of the upper lid 2 are rectangular, it is needless to say that other shapes may be used. For example, the annular metal plates 16D and 16E referred to in the first embodiment may be provided on the inner surface of the upper lid 2. Further, in addition to being provided on the inner surface of the upper lid 2, the metal plates 16D and 16E may be attached by other methods such as suspending the metal plates 16D and 16E from the top plate 4. Furthermore, a shield ring may be applied to one heating unit (for example, 6D), and a metal plate may be applied to the other heating unit (for example, 6E).

  In FIG. 12, the magnetic member of the heating unit 6E (not visible but using the symbol 32E) is not visible, but is provided in the same manner as the magnetic member 32D of the heating unit 6D. The magnetic members 32D and 32E of the heating units 6D and 6E are the same as those in the first embodiment. The following points are also the same as in the first embodiment. Of the plural (six) magnetic members for each induction coil 22D, 22E, the magnetic member closest to the heat sink extends in a direction substantially perpendicular to the direction of extension of the fins of the heat sink. The formed cooling airflow is disturbed, the cooling airflow is dispersed in the width direction of the heat sink, and the cooling airflow passes through all the fins to enhance the cooling efficiency.

  FIG. 14 is a perspective view showing the display contents of FIG. 12 excluding the configuration related to the induction coil and the installation of the induction coil.

  The forced cooling configuration in the second embodiment is the same as that in the first embodiment, although the number of heating units is different.

  The bottom plate 9 of the lower lid 3 has two intake windows 11D and 11E and an exhaust window 12. The intake windows 11D and 11E each take in ambient air into the housing by the rotation of the fan 13D.

  The rotation axis directions of the fans 13D and 13E are the same as those of the corresponding circular induction coils 22D and 22E (in other words, heating units) that the fans 13D and 13E are in charge of cooling for the reason described in the first embodiment. Deviation from the normal direction of the center. Further, for the reason described in the first embodiment, the fan 13D, 13E having a blade diameter smaller than the diameter of the circular region around which the induction coils 22D, 22E to be cooled are wound is applied.

  FIG. 15 is a block diagram illustrating an electrical configuration and the like related to a heating operation in the electromagnetic cooker 1X of the second embodiment.

  The power supplied by the 200V commercial power supply 40 is distributed by the power distributor 41 to the processing series of the heating units 6D and 6E. The alternating current generated by the power distribution to each series is converted to direct current by the rectifier circuits 42D and 42E of the series and supplied to the corresponding inverter circuits 43D and 43E, and the high-frequency driving alternating current is supplied by the inverter circuits 43D and 43E. Is formed and supplied to the induction coils 22D and 22E to generate an alternating magnetic field as appropriate, and the pan facing the induction coils 22D and 22E is self-heated with the top plate 4 interposed therebetween. In order to control the operation of the inverter circuits 43D and 43E, heating control units 44D and 44E are provided in each series. The heating control units 44D and 44E are respectively connected to the corresponding touch panel partial areas 7D and 7E for the heating units 6D and 6E, and take in key inputs and perform lighting control of lamps and the like.

  Most of the electronic components constituting the rectifying circuit 42D, the inverter circuit 43D, and the heating control unit 44D for the heating unit 6D are mounted on the printed wiring board 45D shown in FIG. 14, and the rectifying circuit 42E for the heating unit 6E and the inverter Most of the electronic components constituting the circuit 43E and the heating control unit 44E are mounted on a printed wiring board 45E shown in FIG.

  The printed circuit boards 45D and 45E on which these two electronic components and the like are mounted have the same external configuration as can be understood from FIG. Therefore, the printed wiring boards 45D and 45E can be formed on the same production line. Further, the common configuration of the printed wiring board can realize ease of manufacture and low manufacturing cost. In addition, it is possible to prevent electrical oscillation and mechanical vibration as in the case where electronic components of different heating parts are mounted on one printed wiring board.

  Heat sinks 46D and 46E are provided on the left and right sides of the printed wiring boards 45D and 45E, respectively, and in the depth direction. A plurality of IGBTs constituting the inverter circuits 43D and 43E are mounted on the center of the heat sinks 46D and 46E in the left-right direction at the bottom of the substrate where no fins are provided.

  Also in the second embodiment, the heat sinks 46D and 46E are provided on the front side of the printed wiring boards 45D and 45E, and vibration and wind noise generated when the cooling airflow hits the edge on the front side of the printed wiring boards 45D and 45E. At the same time, one or a plurality of electronic components that generate a large amount of heat are also mounted on the back side of the heat sinks 46D and 46E so that the electronic components are efficiently cooled.

  Since the electromagnetic cooker 1X of the second embodiment is also provided with printed wiring boards 45D and 45E on which many electronic components are mounted in association with the heating units 6D and 6E, the printed wiring boards 45D and 45E are shared. It is sufficient to design the right and left direction and the depth direction in consideration of the weight of the printed wiring boards 45D and 45E, and even if the size and position of each heating unit are taken into consideration, the design work to balance them is easy. Thus, it is possible to realize the electromagnetic cooker 1X in which the left-right direction and the depth direction are balanced.

  FIG. 16 is an explanatory diagram showing the arrangement of keys and light emitting elements in the touch panel region 7 of the electromagnetic cooking device 1X of the second embodiment.

  As described above, the touch panel region 7 is divided into the region 7D related to the left heating unit 6D and the region 7E related to the right heating unit 6E.

  The touch panel area 7D for the left heating unit includes a “heating” key 90 for instructing on (on) / off (off) normal heating in the left heating unit 6D and an on (off) off (off) of boiling water heating in the left heating unit 6D. ) For instructing ”,“ Fried food ”key 92 for instructing on (off) or“ off ”(off) fried food heating in the left heating unit 6D, and steps of normal heating and fried food heating in the left heating unit 6D. “Strength” key 93 for instructing to increase by one level, “Weak” key 94 for instructing to decrease the level of normal heating or deep-fried food heating in left heating unit 6D by one level, and a timer timing in left heating unit 6D Is provided with a “+” key 95 for instructing to lengthen the time by one unit, and a “−” key 96 for instructing to shorten the time measured by the timer in the left heating unit 6D by one unit.

  Further, the touch panel region 7D for the left heating unit indicates that the light emitting element 97 indicating that normal heating is selected, the light emitting element 98 indicating that kettle heating is selected, and fried food heating are selected. A light-emitting element 99 to be displayed, a stage display unit 100 including nine light-emitting elements for displaying a stage selected by normal heating or fried food heating, and a numerical display unit for displaying the remaining time of the timer, the temperature at the time of frying food heating, etc. 101.

  The right heating unit touch panel area 7E includes a “heating” key 102 for instructing on (on) and off (off) normal heating in the right heating unit 6E, and boiled food on (on) and off (off) in the right heating unit 6E. ) To indicate that the normal heating step in the right heating unit 6E is to be increased by one step, and to decrease the normal heating step in the right heating unit 6E by one step. A “weak” key 105 for instructing, a “+” key 106 for instructing to increase the time measured by the timer in the right heating unit 6E by one unit, and a timer time for the right heating unit 6E by one unit A “−” key 107 for instructing shortening is provided.

  The right heating unit touch panel area 7E includes a light emitting element 108 indicating that normal heating is selected, a light emitting element 109 indicating that boiled food heating is selected, and a stage selected by normal heating. It has a stage display unit 110 composed of eight light emitting elements for display, and a number display unit 111 for displaying the remaining time of the timer.

  In addition, the touch panel region 7 is also provided with a light emitting element 112 that represents the on / off state of the power switch, and a light emitting element 113 for urging attention to “high temperature” determined from the operation mode, the heating stage of a predetermined heating unit, and the like. .

  The heating control at the time of heating the boiled food performed by the heating control unit 44E in response to the ON operation of the “boiled food” key 103 is the same as that described in the first embodiment (see FIG. 10).

  FIG. 17: is a perspective view which shows the electromagnetic cooker mounting stand 120 marketed and formed in order to mount the electromagnetic cooker 1X of 2nd Embodiment (or the electromagnetic cooker 1 of 1st Embodiment). is there.

  As described above, the electromagnetic cooker 1X of the second embodiment and the electromagnetic cooker 1 of the first embodiment differ in the number of heating units, but the length in the left-right direction is 590 mm and the length in the depth direction. It has a similar external shape of about 500 mm and a thickness of about 60 mm. Therefore, the mounting table 120 for an electromagnetic cooker shown in FIG. 17 can mount the electromagnetic cooker 1 of the first embodiment or the electromagnetic cooker 1X of the second embodiment. It is.

The induction cooker mounting table 120 includes a top plate 121, a right side plate 122, a left side plate 123, and a back side plate 124 (not visible in FIG. 17). Although not shown, a plurality of protrusions are provided at the upper ends of the right side plate 122, the left side plate 123, and the back side plate 124, and the protrusions described above are fitted in the recesses provided in the lower surface of the top plate 121. It is made to do. Reference numerals 125 to 130 denote blindfold caps that conceal the upper part of the screw that is screwed. The top plate 121 and the right side plate 122 are connected and fixed by screws existing under the blindfold caps 125 and 126,
The top plate 121 and the left side plate 123 are connected and fixed by screws existing below the blindfold caps 127 and 128, and the top plate 121 and the back side plate 124 are connected by screws existing below the blindfold caps 129 and 130. It is fixed. The recesses 131 to 134 provided in the vicinity of the four corners of the top plate 4 are engaged with the leg portions provided at the four corners of the electromagnetic cooker 1 </ b> X or the electromagnetic cooker 1. Note that the concave portions 131 to 134 may not be provided. At the lower ends of the right side plate 122, the left side plate 123, and the back side plate 124, rubber legs for preventing slipping are provided.

  The top plate 121, the right side plate 122, the left side plate 123, and the back side plate 124 are wooden members, and the entire surface thereof is coated with, for example, a paint containing a fungicide that prevents mold. By making it wooden, it is possible to absorb vibration noise generated during the heating operation of the electromagnetic cooker 1X or the electromagnetic cooker 1 and to prevent the temperature from becoming high compared to a metal one. it can. In terms of corrosion, metal is preferable to wood, but corrosion can be suppressed by applying a paint containing a fungicide.

  In addition, since the electromagnetic cooking device mounting table 120 does not include the front side plate, dishes, seasonings, and the like can be placed under the electromagnetic cooking device mounting table 120 during cooking.

  The induction cooker mounting table 120 has a height of about 120 mm. The electromagnetic cooker 1X or the electromagnetic cooker 1 has a thickness (height) of about 60 mm. Therefore, as shown in FIG. 18, the height of the electromagnetic cooker 1X or the electromagnetic cooker 1 placed on the electromagnetic cooker mounting table 120 is about 180 mm.

  As shown in FIG. 18, this height is the same as the depth of a portion that is prepared for installing a cooking device in the kitchen and is one step lower than the other portions. When the mounting table 120 for the electromagnetic cooker on which the cooker 1 is placed is placed in a place that is one step deeper, the surface height of the electromagnetic cooker 1X or the electromagnetic cooker 1 is substantially flush with other places, and cooking is performed. It will be easy.

  In the second embodiment, the number of heating units is smaller than that in the first embodiment, but the same technical idea as that applied by the first embodiment is applied. The same effect as the form can be achieved.

  In the second embodiment, a metal plate is provided on the back surface of the top plate instead of the shield ring, but the same shielding effect as that of the shield ring can be achieved.

  Since the mounting table for the electromagnetic cooker of the second embodiment (same as the mounting table for the electromagnetic cooker of the first embodiment) is wooden coated with a paint containing an antifungal agent, it can absorb vibration noise. It is possible to produce effects such as preventing the table from becoming high temperature and suppressing corrosion. In addition, by placing the electromagnetic cooker on this table for the electromagnetic cooker, the electromagnetic cooker is appropriately placed in a place that is one step lower than other places prepared for installing the cooker in the kitchen. Can be positioned.

(C) Other Embodiments In the description of each of the above-described embodiments, various modified embodiments have been referred to. However, modified embodiments as exemplified below can be given.

  In each of the above embodiments, all the heating units can select a heating step from a plurality of heating steps, but some heating units have one heating step, and the heating step can be selected. It may be impossible.

  In each said embodiment, although the electromagnetic cooker which operate | moves with a 200V commercial power supply was shown, a part of the various technical thoughts mentioned above is applicable also to the electromagnetic cooker which operates with a 100V commercial power supply. It is.

  In each of the above embodiments, a desktop type electromagnetic cooker has been shown, but some of the various technical ideas described above can also be applied to a stationary type electromagnetic cooker.

  In each said embodiment, although the heating part showed 2 or 3 electromagnetic cookers, the number of a heating part is not limited to this. For example, if there are two or more heating units based on induction heating, some of the various technical ideas described above can be applied. When there are two or more heating parts based on induction heating, a heating part based on a principle other than induction heating may be provided.

  DESCRIPTION OF SYMBOLS 1, 1A ... Electromagnetic cooker, 2 ... Upper lid, 3 ... Lower lid, 4 ... Top plate, 6A-6E ... Heating part, 11A-11E ... Intake window, 12 ... Exhaust window, 13A-13E ... Fan, 16D, 16E ... Metal plate provided on the back surface of the top plate, 22A to 22E ... Induction coil, 23A to 23D ... Coil fixture, 32 ... Magnetic body member (ferrite core), 33A, 33B ... Shield ring, 40 ... Commercial power supply, 41 ... Power distributor, 42A to 42E ... rectifier circuit, 43A to 43E ... inverter circuit, 44A to 44E ... heating controller, 45A to 45E ... printed wiring board, 46A to 46E ... heat sink, 63, 103 ... "boiled food" key, 120 ... Mounting table for electromagnetic cooker.

Claims (8)

  An electromagnetic cooker comprising a casing made of an insulator that operates at a power supply voltage higher than 100V. In an electromagnetic cooker equipped with a plurality of heating parts that perform a heating operation by passing an alternating current through the induction coil,
Provided for each heating unit a printed wiring board on which a plurality of electronic components that constitute a component that supplies an alternating current to the induction coil and a component that controls the supply of the alternating current are provided.
An electromagnetic cooker characterized in that a plurality of printed wiring boards have the same hardware configuration including the type of electronic component mounted. Each heating unit has a cooling fan,
On the front side of the device in the printed wiring board, a heat sink is provided, on which a plurality of power control semiconductor elements constituting an inverter circuit that converts a direct current formed from a commercial power source into an alternating current is mounted,
The electromagnetic cooker according to claim 2, wherein a cooling airflow from the fan in charge of cooling the heating unit corresponding to the printed wiring board is caused to flow to a heat sink on the printed wiring board.   The electromagnetic cooker according to claim 2 or 3, wherein the printed wiring board has one or more electronic components mounted on the inner side of the heat sink. A plurality of narrow plate-like magnetic bodies that define the magnetic flux path of the induction electromagnetic field in the direction not directed to the heating region of the induction electromagnetic field by the induction coil are provided for each heating unit,
Among the plurality of plate-like magnetic bodies provided for each heating unit, the plate-like magnetic body disposed at the position closest to the heat sink corresponding to the heating unit extends in a direction orthogonal to the parallel arrangement direction of the fins of the heat sink. The electromagnetic cooker according to any one of claims 2 to 4, wherein an air flow from the corresponding fan is diffused in a direction in which fins of the heat sink are juxtaposed.   The electromagnetic cooker according to any one of claims 1 to 5, which operates using an external power source of 200V as an operating power source.   It is a portable desktop type, The electromagnetic cooker in any one of Claims 1-6 characterized by the above-mentioned.   The number of said heating parts is three, The electromagnetic cooker in any one of Claims 1-7 characterized by the above-mentioned.

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