JP5233654B2 - Induction heating cooker - Google Patents

Description

  The present invention relates to an induction heating cooker that induction-heats an object to be heated by a plurality of heating coils.

Conventionally, this type of induction heating cooker has been disclosed in which an induction heating cooker is arranged that is concentrically arranged and includes inner and outer coils having different diameters, and alternately supplies induction heating power to the inner and outer coils. Yes. In the induction heating cooker of Patent Document 1, when the inner coil is heating the object to be heated, the outer coil is stopped, and when the outer coil is heating the object to be heated, the inner coil is stopped. doing. Thereby, a convection arises in the to-be-cooked object in a to-be-heated material, and heat spreads to the whole to-be-cooked material (for example, refer patent document 1).
Japanese Patent No. 2978069

  However, in the conventional configuration, as shown in FIG. 11, the convection generated in the object to be cooked in the object to be heated can form only a closed flow path in the half of the axis target plane. In such convection of the flow path, only a small flow path in which the food to be cooked moves up and down in the vertical direction can be formed. Therefore, the cooker uses the mixing means such as chopsticks to cook the food in the heated object. It is not possible to make a large flow path that stirs things.

  The present invention solves the above-described conventional problems, and an induction heating cooker capable of generating a counter flow channel having an effect of greatly moving and stirring the cooking object in the heating object by heating control. The purpose is to provide.

  In order to solve the conventional problems, an induction heating cooker according to the present invention includes an object to be cooked, an object to be heated such as a pan in which the object to be cooked is placed, and a top plate on which the object to be heated is placed. A plurality of annular heating coils disposed in substantially the same plane below the top plate and having different circular centers, an inverter for supplying induction heating power to the plurality of heating coils, and controlling an output of the inverter And a control unit for instructing the control unit to start / stop heating, set a heating power, etc., and the control unit is half of the plurality of heating coils in response to an instruction from the operation unit. As described above, the amount of induction heating power supplied to less than all of the heating coils is controlled more than the induction heating power of the remaining heating coils, thereby supplying a large amount of induction heating power for the pan to be heated. Convection part An induction heating cooker capable of generating a convection having a large flow path loop in the cooking object in the heated object, with a rising part and a part far from a part supplying a large amount of induction heating power as a falling part Can be provided.

  Further, even when the object to be cooked is highly viscous and convection does not occur, it is possible to simultaneously perform a plurality of heating cookings such as high heat cooking on one side and low heat cooking on the other side.

In the induction heating cooker of the present invention, the portion that supplies a large amount of induction heating power of the pan that is the object to be heated is the convection rising portion, and the portion that is far from the portion that supplies a large amount of induction heating power is the falling portion. It is possible to provide an induction heating cooker capable of generating convection having a large flow path loop in the cooking object in the heating object. Further, even when the object to be cooked is highly viscous and convection does not occur, it is possible to simultaneously perform a plurality of heating cookings such as high heat cooking on one side and low heat cooking on the other side.

  1st invention arrange | positions a to-be-cooked object, to-be-heated objects, such as a pot which puts the said to-be-cooked object, the top plate for mounting the said to-be-heated object, and the substantially same plane below the said top plate. A plurality of annular heating coils having different circular centers, an inverter for supplying induction heating power to the plurality of heating coils, a control unit for controlling the output of the inverter, and heating start / An operation unit for instructing a stop, a thermal power setting, and the like, and the control unit supplies induction heating power to more than half of the plurality of heating coils and less than all of the heating coils according to an instruction from the operation unit. By controlling the amount to be supplied more than the induction heating power of the remaining heating coils, the portion that supplies a large amount of induction heating power of the pan that is the object to be heated is supplied with the convection rising part and the induction heating power. Part It can provide et distant parts of the object to be cooked can be generated convection with large flow path loop induction heating cooker in the object to be heated as a descender.

  Further, even when the object to be cooked is highly viscous and convection does not occur, it is possible to simultaneously perform a plurality of heating cookings such as high heat cooking on one side and low heat cooking on the other side.

  In the second invention, in particular, the control unit of the first invention is controlled so that the heating coil that supplies a large amount of induction heating power and the heating coil that supplies a small amount of induction heating power are changed during cooking. Move the part where a lot of electric power is supplied to move the direction of the large convection loop in the direction perpendicular to the vertical direction to generate the stirring effect, promote emulsification of the cooked food, When obtaining the effect of accelerating dissolution or physically stirring the solid food in the liquid, the part that supplies less induction heating power plays the role of heat retention power, so the heating part Induction that eliminates the time delay required to warm the heated object during movement and the time delay required to start the heat transfer from the heated object to the cooked food, increasing the responsiveness and heating efficiently. Cooking It is possible to provide.

  The third aspect of the invention controls the current direction when applying the induction heating power to the heating coil so that the magnetic flux generated in the adjacent heating coils is in the same direction, particularly the control unit of the first or second aspect of the invention. Thus, it is possible to provide an induction heating cooker capable of generating a strong upward flow that is a basis of convection and making convection stronger.

  In the fourth aspect of the invention, in particular, the control unit of the first or second aspect of the invention controls the current direction when the induction heating power is applied to the heating coils so that the magnetic fluxes generated in adjacent heating coils cancel each other. Induction heating cooker that can be heated while giving heat fluctuation to promote high-viscosity cooking that is likely to cause scorching when heated regularly (convection is unlikely to occur) Can be provided.

  According to a fifth aspect of the present invention, in particular, the controller according to any one of the second to fourth aspects is changed during cooking, with the heating coil supplying a large amount of the induction heating power and the heating coil supplying a small amount of the induction heating power. However, by controlling the total electric energy to be constant, it is possible to provide an induction heating cooker that can make the cooking sensation almost the same as when the heating unit is not moved.

  In a sixth aspect of the invention, the control unit of the fifth aspect of the invention is controlled so that the heating coil that supplies a large amount of induction heating power and the heating coil that supplies a small amount of induction heating power are gradually changed during cooking. By doing so, it is possible to provide an induction heating cooker that can suppress the generation of useless turbulent flow when the convection direction is changed during movement of the heating unit and can smoothly move in the convection direction.

  The seventh invention is the induction heating cooker according to any one of the first to sixth inventions in particular, the plurality of heating coils are four heating coils, and two heating coils for supplying a large amount of induction heating power are provided. By adopting two heating coils that supply a small amount of induction heating power, an inexpensive configuration with a minimum number of heating coils when the object to be heated with a circular bottom is covered with a circular heating coil can be used in the vertical direction. An induction heating cooker capable of performing convection movement in a vertical direction can be provided.

  The eighth invention is the induction heating cooker according to any one of the first to sixth inventions in particular, the plurality of heating coils are four heating coils, and three heating coils for supplying a large amount of induction heating power are provided. By using a single heating coil that supplies a small amount of induction heating power, induction heating cooking that can efficiently perform heating while reducing loss by reducing the power burden per heating coil when the same energy is input. Can be provided.

  The ninth aspect of the invention is the induction heating cooker of any one of the first to sixth aspects of the invention, wherein the plurality of heating coils are six heating coils, and the number of heating coils for supplying induction heating power is three. By using three heating coils that do not supply heating power, it is possible to provide an induction heating cooker that can more precisely perform convection movement in a direction perpendicular to the vertical direction.

  The tenth aspect of the invention is particularly the induction heating cooker of any one of the first to sixth aspects, wherein the plurality of heating coils are six heating coils, and four heating coils that supply a large amount of induction heating power are provided. By using two heating coils that supply less induction heating power, the power burden per heating coil when the same energy is input is reduced, and convection moves in a direction perpendicular to the vertical direction. An induction heating cooker that can be performed more finely can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a block diagram of an induction heating cooker according to the first embodiment of the present invention.

  In FIG. 1, 101 is an object to be cooked, 102 is an object to be heated, 103 is a heating coil, 104 is an inverter, 105 is a control unit, 106 is an operation unit, and 107 is a top plate.

  The heated object 102 is a pan, and the heating coil 103 is arranged by arranging four annular coils having different circular centers of the same size on the same plane close to each other to form one heated object 102 with four coils. This configuration can be easily realized by using a microcomputer for the heating configuration, the control unit 105 and the operation unit 106, and a glass plate for the top plate 107.

  About the induction heating cooking appliance comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

First, when the user puts the object to be cooked 101 into the object to be heated 102 and instructs to start heating the object to be cooked 101, the control unit 105 operates the inverter 104 to generate a high-frequency magnetic field in the heating coil 103, so 102 induction heating is performed. At this time, as shown in FIG. 2, a large amount of induction heating power is supplied to coils (for example, coils 1 and 4) that occupy half the area constituting the heating coil 103, and the remaining coils (for example, 2 and 3). When the induction heating power having a small amount of heat retention power is supplied to the coil), the specific gravity of the portion in the heated object 102 to which much induction heating power is supplied is reduced. The object to be heated 102 is heated most by the coils 1 and 4 in the central portion of the coil portion indicated by the white arrow, and an upward flow that is a basis for convection is generated in the object 101 in this portion. . And since the heat | fever by induction heating is transmitted to the to-be-heated object 102 also by heat conduction, it will be a place farthest from the part currently being induction-heated that the to-be-heated to-be-cooked 101 tends to fall physically. Therefore, the flow path of the convection generated in the object to be cooked 101 in the object to be heated 102 becomes a large convection loop passing through more than half of the surface in the object to be cooked 101 as shown in FIG.

  As described above, in the present embodiment, more than half of the plurality of heating coils 103 and less than all of the heating coils 103 are supplied with a larger amount of induction heating power than the induction heating power of the remaining heating coils. By doing this, the portion that supplies a large amount of induction heating power of the pan, which is the object to be heated 102, is a convection rising portion, and the portion that is far from the portion that supplies a large amount of induction heating power is a falling portion in the object to be heated 102 The convection having a large channel loop can be generated in the object to be cooked 101.

  In addition, even when the to-be-cooked object 101 is highly viscous and convection does not occur, it is possible to simultaneously perform a plurality of heating cookings such as high heat cooking on one side and low heat cooking on the other side.

(Embodiment 2)
FIG. 3 shows a block diagram of an induction heating cooker according to the second embodiment of the present invention. In FIG. 3, reference numeral 301 denotes a control unit that changes a heating coil that supplies a large amount of induction heating power and a heating coil that supplies a small amount of induction heating power during cooking. Note that this configuration can be easily realized by using a microcomputer for the control unit 301.

  About the induction heating cooking appliance comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. In the drawings, the same reference numerals are given to portions showing the same operations as those in the first embodiment.

  The basic operation of the induction heating cooker in the second embodiment is the same as that in the first embodiment, but in the second embodiment, a portion for supplying a large amount of induction heating power is provided every predetermined time (for example, every 10 seconds). The operation to change in order is performed. In this way, by changing the portion where a large amount of induction heating power is supplied, the direction of the convection loop generated in the object to be cooked 101 can be periodically changed. Such a physical stirring effect can be generated. Here, when the to-be-cooked object 101 is comprised from solids, such as a potato, and liquids, such as a soup, the effect which rolls a solid in a pan and permeates the soup can be acquired.

  At this time, the part that supplies a small amount of induction heating power plays the role of heat insulation power, so that when the heated part is moved, the time delay necessary for warming the heated object and the object to be cooked are heated. Since it is possible to eliminate the time delay required to start the heat transfer to the heat exchanger, it is possible to improve the responsiveness of changing the heating position and efficiently perform the heating.

  As described above, in the present embodiment, the control unit 301 supplies a large amount of power by changing the heating coil that supplies a large amount of induction heating power and the heating coil that supplies a small amount of induction heating power during cooking. The portion of the convection loop is moved to move the direction of the large convection loop in a direction perpendicular to the vertical direction to generate an agitation effect, thereby facilitating emulsification of the cooked food or speeding up the dissolution of dissolvable solids. In this case, it is possible to obtain the effect of physically moving and stirring the solid food in the liquid. It eliminates the time delay required to warm the heated object during partial movement and the time delay required to start the heat transfer from the heated object to the cooking object, thus improving responsiveness and heating efficiently. That.

  In the present embodiment, a plurality of heating coils are described as four, but the number of heating coils is not limited to four.

  Here, as shown in FIG. 4, when a plurality of heating coils 103 are used as four heating coils, two heating coils that supply a large amount of induction heating power are used, and two heating coils that supply a small amount of induction heating power are used. In the case where the object to be heated 102 having a circular bottom is covered with a circular heating coil, the convection can be moved in a direction perpendicular to the vertical direction with an inexpensive configuration with a minimum number of heating coils. .

  In addition, as shown in FIG. 5, when a plurality of heating coils 103 are used as four heating coils, three heating coils that supply a large amount of induction heating power are used, and one heating coil that supplies a small amount of induction heating power is used. Can reduce the loss of electric power per heating coil when the same energy is input, and can efficiently perform heating while suppressing loss.

  Further, as shown in FIG. 6A, the plurality of heating coils 103 are six heating coils, three heating coils that supply a large amount of induction heating power, and three heating coils that supply a small amount of induction heating power. In this case, the convection can be moved more finely in the direction perpendicular to the vertical direction.

  As shown in FIG. 6B, the plurality of heating coils are six heating coils, four heating coils that supply a large amount of induction heating power, and two heating coils that supply a small amount of induction heating power. In this case, the convection movement in the direction perpendicular to the vertical direction can be performed more finely while reducing the power burden per heating coil when the same energy is input.

  In addition, when the control unit 301 changes the heating coil that supplies a large amount of induction heating power and the heating coil that supplies a small amount of induction heating power during cooking, it controls the power fluctuation so that the total power amount is constant. By doing this, the total energy applied to the object to be cooked is not changed, so that the cooking sensation can be made substantially the same as when the heating unit is not moved.

  Further, the control unit 301 gradually changes the heating coil that supplies the induction heating power and the heating coil that does not supply the induction heating power during cooking (for example, the non-change time 15 seconds, the change time 3 seconds), Generation of useless turbulence can be suppressed when the convection direction is changed when the heating unit is moved, and the convection direction can be moved smoothly.

  The heating coils in FIGS. 4, 5, and 6 are annular heating coils, but are shown in a simplified manner.

(Embodiment 3)
FIG. 7 shows a block diagram of an induction heating cooker according to the third embodiment of the present invention. In FIG. 7, reference numeral 701 denotes a control unit that changes a heating coil that supplies a large amount of induction heating power and a heating coil that supplies a small amount of induction heating power during cooking. When supplying induction heating power, adjacent heating coils The direction of the current when the induction heating power is applied to the heating coil is determined so that the magnetic flux generated in step 1 is in the same direction. Note that this configuration can be easily realized by using a microcomputer for the control unit 701.

  About the induction heating cooking appliance comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. In the drawings, the same reference numerals are given to portions showing the same operations as those in the first and second embodiments.

The basic operation of the induction heating cooker in the third embodiment is the same as that in the first and second embodiments. However, in the third embodiment, when induction heating is performed, as shown in FIG. The current direction when applying the induction heating power to the heating coil is determined so that the magnetic fluxes generated in the adjacent heating coils are in the same direction. In the case of adjacent coils wound in the same direction as shown in FIG. 8 (a), when currents of the same phase are passed, they flow in the opposite direction in the adjacent portions. Therefore, as shown in FIG. 8B, by applying a current that is in reverse phase in the high-frequency current to the coil 1 and the coil 2, the magnetic fluxes generated by influencing each other in close proximity are aligned in the direction of strengthening. As a result, as shown in FIG. 8C, it is possible to create a high-temperature portion due to the magnetic flux enhancement effect. Since the strength of induction heating is proportional to the amount of magnetic flux, this portion is at a higher temperature than other portions, and the rising portion that is the basis of convection can be made stronger.

  As described above, in the present embodiment, the control unit 701 determines the current direction when applying the induction heating power to the heating coil 103 so that the magnetic fluxes generated in adjacent heating coils are in the same direction. The convection can be strengthened by generating a strong upward flow that is the basis of convection.

  In addition, it cannot be overemphasized that this operation | movement of this Embodiment may be made to perform this operation | movement automatically according to the cooking menu of the to-be-cooked object 101 selected from the operation part 106. FIG.

(Embodiment 4)
FIG. 9 shows a block diagram of an induction heating cooker according to the fourth embodiment of the present invention. In FIG. 9, reference numeral 901 denotes a control unit that changes a heating coil that supplies a large amount of induction heating power and a heating coil that supplies a small amount of induction heating power during cooking. When supplying induction heating power, adjacent heating coils The direction of the current when the induction heating power is applied to the heating coil is determined so that the magnetic flux generated in step 1 cancels out. Note that this configuration can be easily realized by using a microcomputer for the control unit 901.

  About the induction heating cooking appliance comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. In the drawings, the same reference numerals are given to portions showing the same operations as those in the first and second embodiments.

  The basic operation of the induction heating cooker in the fourth embodiment is the same as in the first and second embodiments, but as shown in FIG. 10, in the fourth embodiment, when induction heating is performed. The current direction when applying the induction heating power to the heating coils is determined so that the magnetic fluxes generated in the adjacent heating coils cancel each other. As shown in FIG. 10 (a), in the case of adjacent coils wound in the same direction, when currents having opposite phases are flowed, the adjacent portions flow in the same direction. Therefore, as shown in FIG. 10 (b), the currents having the same phase in the high-frequency current are supplied to the coils 1 and 2, so that the magnetic fluxes generated by the mutual influences in the adjacent portions are aligned in the direction of canceling each other. be able to. As a result, as shown in FIG. 10C, in the proximity portion of the coil, the induction heating amount is suppressed by the magnetic flux canceling effect, but there is a heat transfer effect from the heating portions of the adjacent heating coils on both sides, By appropriately transmitting the heat generation amount for the two coils, a uniform heat generation distribution state can be created in the entire heating coil to which induction heating power is applied.

  Thereby, it becomes a uniform heat generating part without a high temperature part, and when convection is generated, it becomes possible to generate convection in a state where it is difficult to cause scorching. Moreover, when the characteristic of the to-be-cooked object 101 is a thing which does not generate | occur | produce a convection easily, scorching can be suppressed.

As described above, in the present embodiment, the control unit 901 determines the current direction when applying the induction heating power to the heating coil 103 so that the magnetic fluxes generated in the adjacent heating coils cancel each other, so that the steady state is obtained. Heating can be applied to a highly viscous cooked product that is likely to be burnt when heated to a high temperature (i.e., convection is unlikely to occur), and warming can be performed while promoting heat conduction.

  Note that the operation of the present embodiment may be performed automatically in accordance with the cooking menu of the object to be cooked 101 selected from the operation unit 106.

  As described above, the induction heating cooker according to the present invention supplies the induction heating power to the heating coils of the half or more and less than all of the plurality of heating coils, and does not supply the induction heating power to the remaining heating coils. Thus, the convection having a large flow path loop can be generated in the cooking object in the heated object, with the induction heating part of the pan to be heated as the rising part of the convection and the part far from the induction heating part as the falling part. . Further, even when the object to be cooked is highly viscous and convection does not occur, it is possible to simultaneously perform a plurality of heating cookings such as high heat cooking on one side and low heat cooking on the other side.

  This operation can be applied to other than the induction heating cooker if the movement of the heating part by the induction heating coil is realized by moving the position where the flame generated by gas or the like directly hits the object to be heated.

The block diagram which shows the structure of the heating cooker in Embodiment 1 of this invention. The figure which shows the mode of the convection in Embodiment 1 of this invention The block diagram which shows the structure of the heating cooker in Embodiment 2 of this invention. The figure which shows the mode of the convection direction movement in Embodiment 2 of this invention The figure which shows the mode of the convection direction movement (three heating parts) in Embodiment 2 of this invention. The figure which shows the mode of the convection direction movement (six coils) in Embodiment 2 of this invention. The block diagram which shows the structure of the heating cooker in Embodiment 3 of this invention. The figure which shows the mode of the heat_generation | fever distribution in Embodiment 3 of this invention. The block diagram which shows the structure of the heating cooker in Embodiment 4 of this invention. The figure which shows the mode of the heat_generation | fever distribution in Embodiment 4 of this invention. The figure which shows the mode of the convection in the conventional induction heating cooking appliance

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 To-be-cooked object 102 To-be-heated object 103 Heating coil 104 Inverter 105 Control part 106 Operation part 107 Top plate 301 Control part 701 Control part 901 Control part

Claims (10)

A to-be-cooked object, a to-be-heated object such as a pan in which the to-be-cooked object is to be placed, a top plate for placing the to-be-heated object, and a substantially concentric plane disposed below the top plate, A plurality of annular heating coils, an inverter for supplying induction heating power to the plurality of heating coils, a control unit for controlling the output of the inverter, and heating start / stop and heating power setting for the control unit. An operation unit for instructing, and the control unit, in accordance with an instruction from the operation unit, leaves an amount of induction heating power to be supplied to more than half of the plurality of heating coils and less than all of the heating coils. An induction heating cooker characterized by causing convection to occur in the cooking object in the heated object by controlling more than the induction heating power of the heating coil. The induction heating cooking according to claim 1, wherein the control unit controls the heating coil that supplies a large amount of induction heating power and the heating coil that supplies a small amount of induction heating power so as to change during cooking. vessel. The induction heating cooker according to claim 1 or 2, wherein the control unit controls a current direction when applying induction heating power to the heating coils so that magnetic fluxes generated in adjacent heating coils are in the same direction. The induction heating cooker according to claim 1 or 2, wherein the control unit controls a current direction when the induction heating power is applied to the heating coils such that magnetic fluxes generated in adjacent heating coils cancel each other. The control unit controls the heating coil that supplies a large amount of the induction heating power and the heating coil that supplies a small amount of the induction heating power so that the total power amount is constant even if the heating coil is changed during cooking. The induction heating cooker according to any one of claims 2 to 4. The said control part controls the heating coil which supplies many said induction heating electric powers, and the heating coil which supplies few induction heating electric powers so that it may change gradually during cooking. Induction heating cooker. The plurality of heating coils are four heating coils, wherein two heating coils for supplying a large amount of induction heating power are provided, and two heating coils for supplying a small amount of induction heating power are used. The induction heating cooker described. The plurality of heating coils are four heating coils, the number of heating coils supplying a large amount of induction heating power is three, and the number of heating coils supplying a small amount of induction heating power is one. The induction heating cooker described. The plurality of heating coils are six heating coils, three heating coils that supply induction heating power, and three heating coils that do not supply induction heating power, according to any one of claims 1 to 6. Induction heating cooker. The plurality of heating coils are six heating coils, the number of heating coils supplying a large amount of induction heating power is four, and the number of heating coils supplying a small amount of induction heating power is two. The induction heating cooker described.

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