JP4998128B2 - Induction heating cooker and pot for induction heating cooker - Google Patents

Description

  The present invention relates to an induction heating cooker that induction-heats a cooking container and controls the temperature of the cooking container using an infrared sensor, and a pan for the induction heating cooker.

  In recent years, induction cooking devices have been widely used as cooking devices that do not use fire.

  In this induction heating cooker, an infrared sensor is disposed below the heating coil, and the output of the heating coil is controlled by controlling the inverter circuit by the control means according to the output from the infrared sensor (for example, Patent Document 1). reference).

In recent years, earthenware pots have also been developed that have a heating element using silver at the bottom of the pot so that they can also be heated in induction heating cookers (see, for example, Patent Document 2).
JP 2005-38660 A JP 2005-334351 A

  However, in the induction heating cooker having the above-described configuration and the pot for the induction heating cooker, when a clay pot made of silver is heated at a high input, the temperature of the heating element becomes high. As a result, the temperature of the heating coil rises, and there is a problem that the main body breaks down or malfunctions. For this reason, until now, many of these pans have limited input when the user uses them in the instruction manual, but there is also a problem that there is a risk of easily adding a high input by mistake. Had.

  The present invention has been made in view of such problems of the prior art, and what kind of heating power setting is used when a silver transfer clay pot is used in an induction heating cooker that is controlled by an infrared sensor. However, it is an object of the present invention to provide a safe induction heating cooker and a pot for the induction heating cooker (earthen pot) that are designed to provide input that does not cause problems in the induction heating cooker body.

In order to achieve the above object, an induction heating cooker and a pan for an induction heating cooker according to the present invention are radiated from a main body constituting an outer shell and a cooking container mounted on an upper portion of the main body and mounted on the main body. A top plate having an infrared incident region that transmits infrared rays, a heating coil that is provided below the top plate and generates an induction magnetic field to heat the cooking vessel, and a cooking coil that is provided below the top plate and is provided from the cooking vessel. An infrared sensor for detecting the emitted infrared light, a light guide tube provided below the infrared incident area and radiated from the cooking container and guiding the infrared light incident from the infrared incident area to the infrared sensor, and the infrared light Control means for controlling the output of the heating coil so that the output signal of the infrared sensor becomes constant based on the output signal of the sensor , And a pot di previous SL cooking vessel convex feet on the bottom, the infrared sensor is disposed at a position different from the center of the heating coil in the radial direction of the inner edge of the heating coil, and The earthenware pot has a heating element using silver that enables heating by electromagnetic induction heating at the bottom of the pot, and is placed so that the center of the heating element of the earthenware pot is located immediately above the center of the heating coil. Sometimes, the portion located immediately above the infrared sensor has a higher amount of silver than the other portions, so that the portion located directly above the infrared sensor has a higher temperature than the other portions. It is a thing.

  As a result, when the earthenware pot is placed and heated so that the center of the heating element of the earthenware pot is located directly above the center of the coil, a large amount of current flows through the pot bottom temperature at the infrared sensor position, resulting in a high temperature. . The earthenware pan is provided with legs to provide a distance between the top plate and the heating element at the bottom of the pan to prevent the temperature rise of the induction heating cooker due to heat transfer, but the infrared sensor detects the temperature of the pan bottom, Changes in the bottom temperature can be reflected in the input to the infrared sensor without being affected by the distance between the bottom and the top plate. Therefore, the input of the infrared sensor increases due to the temperature rise at the bottom of the pan immediately above the infrared sensor. Since the control means controls the input to the infrared sensor to be constant, the input to the heating coil is suppressed. At that time, the temperature at the bottom of the pan other than directly above the infrared sensor is lower than that directly above the infrared sensor, so that the radiant heat from the entire pan bottom is reduced, and thus the temperature rise of the heating coil is suppressed, and the heating coil is burned. It is possible to prevent failures and malfunctions of the induction heating cooker body.

  According to the induction heating cooker and the pan for the induction heating cooker of the present invention, when a pan made of a heating element using silver is heated with an induction heating cooker at a high input setting, the temperature directly above the infrared sensor is increased. And by increasing the input of the infrared sensor, the control means suppresses the coil output and reduces the radiant heat of the entire pan bottom, suppresses the temperature rise of the heating coil, and induction heating cooker body such as heating coil seizure Can prevent malfunctions and malfunctions.

A first invention includes a main body that constitutes an outer shell, a top plate that is attached to an upper portion of the main body and that has an infrared incident region on which a cooking container is placed and which transmits infrared rays radiated from the cooking container, and the top plate A heating coil provided below to generate an induction magnetic field to heat the cooking vessel, an infrared sensor provided below the top plate to detect infrared radiation emitted from the cooking vessel, and below the infrared incident region A light guide tube that is radiated from the cooking container and guides infrared light incident from the infrared light incident area to the infrared sensor; and an output of the heating coil based on an output signal of the infrared sensor. and a control means for controlling so that the signal is constant, the pot is a lifting previous SL cooking vessel convex feet on the bottom, the infrared cell Sa is the be in the radial direction of the inner edge of the heating coil is arranged at a position different from the center of the heating coil, and said pot is a heating element using silver to allow heating by electromagnetic induction heating pan bottom a, wherein when the center of the heating element of the pot directly above the center of the heating coil is placed so as to be positioned, so as to be greater than the amount of silver and the other part of the portion located directly above the infrared sensor By making the part located immediately above the infrared sensor at a higher temperature than the other parts, the pan made of a silver heating element is heated with an induction heating cooker at a high input setting. In this case, by increasing the temperature of the infrared sensor by increasing the temperature directly above the infrared sensor, the control means suppresses the coil output and reduces the radiant heat of the entire pan bottom, thereby suppressing the temperature rise of the heating coil. It is possible to prevent failure or malfunction of the induction heating cooking device body including seizure of the heating coil.

  According to a second aspect of the present invention, in particular, in the first aspect of the invention, the silver amount in the portion located immediately above the infrared sensor is increased, and the thickness of the heating element in the portion located directly above the infrared sensor is set to be different from that in the other portions. By making the structure thicker, when the pan with a silver heating element is heated with an induction heating cooker at a high input setting, the temperature directly above the infrared sensor is increased to increase the input of the infrared sensor. Therefore, the output of the coil can be suppressed by the control means to reduce the radiant heat as the whole pan bottom, the temperature rise of the heating coil can be suppressed, and the failure or malfunction of the induction heating cooker body such as the burning of the heating coil can be prevented.

  According to a third aspect of the invention, in particular, in the first or second aspect of the invention, the structure is such that the legs of the earthenware pot are continuously formed in an annular shape, thereby preventing ambient light from entering the space at the bottom of the pot, and using an infrared sensor to Temperature can be detected stably and accurately.

  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)
In FIG. 1, the schematic sectional drawing of the induction heating cooking appliance C of the 1st Embodiment of this invention is shown.

  As shown in FIG. 1, an induction heating cooker C according to the present invention includes a main plate 2 that constitutes an outer shell, and a top plate on which a cooking pan that is attached to the upper portion of the main unit 2 and includes a dedicated clay pot P is placed. 4 and a heating coil 6 provided below the top plate 4 and generating a high-frequency magnetic field.

  The top plate 4 is a non-magnetic material that transmits light, and a heating unit for placing the cooking pan including the earthenware pan P is formed by forming a printed film in a circular shape on the back surface corresponding to the heating coil 6. A black light shielding layer (not shown) having a light transmittance of about zero is formed by printing on the outer side (lower surface) of the printed film. At least a part of the top plate 4 is formed with an infrared incident region 4a that transmits infrared rays. In the present embodiment, the infrared incident region 4 a is provided so as to face the top plate 4 at a portion different from the center of the heating coil 6 on the radially inner side of the inner edge of the heating coil 6. A circular punched portion is formed in a part of the printed film and the light shielding layer facing the infrared incident region 4a.

  The heating coil 6 is mounted on a coil base 8 made of resin or the like, and is held by a plurality of coil holders (not shown) extending radially and formed at predetermined intervals. Are provided with an infrared sensor 10 for detecting the temperature of the bottom of the cooking pan including the earthenware pan P located on the near side from the center of the heating coil 6 and a light emitter 11 for emitting light toward the top plate 4. The infrared sensor 10 and the light emitter 11 are installed on a substrate (printed wiring board) 12.

  The infrared sensor 10 is provided so as to face the top plate 4 directly below the infrared incident region 4 a, that is, at a radially inner side of the inner edge portion of the heating coil 6 and different from the center of the heating coil 6.

  A flat plate-like filter 14 for suppressing the transmission of visible light is provided above the infrared sensor 10, and a side wall 16 for suppressing the transmission of visible light is also provided around the infrared sensor 10. The filter 14 is mounted on the substrate 12 so as to cover the infrared sensor 10 on the substrate 12 via the side wall 16 surrounding the infrared sensor 10, and the filter 14 positioned directly above the infrared sensor 10 includes A lens 18 for narrowing the visual field of the infrared sensor 10 is integrally formed.

  In addition, the heating coil 6 can be configured to have a split winding configuration of an inner coil and an outer coil, and the infrared sensor 10 can be disposed directly under the inner edge of the heating coil 6 and between the inner coil and the outer coil.

  An amplifier (not shown) for amplifying the output signal from the infrared sensor 10 is provided on the substrate 12, and the output signal from the infrared sensor 10 is amplified by the amplifier to connect the lead wire 22 connected to the connector 20. To the control means 24.

  The substrate 12 on which the infrared sensor 10 and the light emitter 11 are placed is housed in a case 26 formed of a light-shielding material. A light guide tube 56 is provided on the upper surface of the case 26 so as to face the infrared sensor 10. The opening 26a for allowing the infrared rays radiated from the cooking pan including the earthenware pan P to pass therethrough is formed.

  An operation panel 28 for operating the heating cooker C is provided in front of the control means 24. When a heating operation is instructed by operating the operation panel 28, an output signal from the infrared sensor 10 is amplified by an amplifier, and the control means 24 supplies high frequency power to the heating coil 6 based on the amplified output. 30 is controlled and the temperature of the earthenware pot P and other pots is adjusted to predetermined | prescribed temperature.

  3 and 4 are a bottom perspective view and a cross-sectional view of a clay pot P according to the present invention. As shown in FIG. 3 or 4, the earthenware pot P according to the present invention has legs 60 that are continuously formed in an annular shape in a convex shape on the outer periphery of the bottom surface 58 of the pot. A heating element 62 made of a glass mixture is printed in three layers by a transfer method. The range of the printing part is set to a size corresponding to the heating coil 6. The thickness of one layer of the heating element 62 is about 10 μm to 30 μm, and can be changed depending on the heating output and area to be obtained as appropriate. The first layer of the heating element 62 is printed on almost the entire surface of the printing unit, and the second and third plates are centered with respect to a circle whose radius is the distance from the coil center of the induction heating cooker C to the infrared sensor 10. And a ring with a certain width on the leg side. By doing so, a donut-shaped heat generating layer 62a in which the heat generating elements are tripled is provided immediately above the infrared sensor 10.

  With such a configuration, the amount of silver can be increased by increasing the thickness of the heating element immediately above the infrared sensor 10, and the amount of silver can be decreased by reducing the thickness of the heating elements in other portions.

[Operation of induction heating cooker]
About the induction heating cooking appliance C and the earthenware pan P comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  When water and ingredients are put in the earthenware pot P and cooked in the induction heating cooker C, the earthenware pot P is placed in the center of the heating unit and the power switch (not shown) of the induction heating cooker C is turned on. Since the heating operation can be started by operating a cut-off key (not shown) provided on the panel 28, the infrared sensor 10 receives infrared rays emitted from the heating element 62 on the bottom surface of the clay pot P. .

  When a heating operation is started by operating a cut-off key (not shown) provided on the operation panel 28, the control unit 24 supplies high-frequency power to the heating coil 6 through the inverter power supply 30. When high-frequency power is supplied to the heating coil 6, the heating coil 6 generates an induction magnetic field, and the temperature of the heating element 62 on the bottom surface of the earthenware pot P rises due to induction heating. When the temperature of the heating element of the earthenware pot P rises, the heating element generally emits infrared energy proportional to a quadruple of its absolute temperature, as shown by Stefan-Boltzmann's law. The infrared rays emitted from the heating element 62 pass through the infrared incident region 4 a and the light guide tube 42, pass through the filter 14 provided so as to cover the infrared sensor 10, and reach the infrared sensor 10.

  When the temperature of the heating element 62 increases, the output signal of the infrared sensor 10 receiving the infrared energy increases, and as described above, this output signal is amplified by the amplifier. The control means 24 adjusts ON / OFF or strength of the high-frequency power output from the inverter power supply 30 so that the amplified output becomes a predetermined value set in advance.

  Here, the heating element 62 of the earthenware pan P is formed so that the thickness is increased by the heating layer 62a immediately above the infrared sensor 10, that is, the temperature is increased because current flows through that portion. The earthenware pan P is provided with legs 60 formed continuously in an annular shape to provide a distance between the top plate 4 and the heating element 62 at the bottom of the pan to prevent the temperature rise of the induction heating cooker due to heat transfer. Since the temperature of the pan bottom is detected by the sensor 10, the change in the pan bottom temperature can be reflected in the input to the infrared sensor 10 without being affected by the distance between the pan bottom and the top plate.

  Further, since the legs 60 are continuously formed in an annular shape, it is possible to prevent disturbance light from entering the infrared sensor 10 and to detect the temperature change of the pan bottom more stably and accurately.

  Therefore, the input of the infrared sensor 10 increases due to the temperature rise of the heat generating layer 62a immediately above the infrared sensor 10. When the high frequency power output from the inverter power supply 30 is adjusted so that the infrared energy detected by the infrared sensor 10 becomes a predetermined value set in advance, and the input to the heating coil 6 is suppressed, the range other than the heat generation layer 62a The temperature becomes lower and the radiant heat from the bottom of the pan decreases as a whole. For this reason, the temperature rise of the heating coil 6 by radiation is suppressed.

  Thus, according to the present embodiment, by increasing the thickness of the heat generating layer 62a immediately above the infrared sensor 10, the temperature of the heat generating elements other than the heat generating layer 62a becomes a lower value, so the radiant heat as the whole pan bottom is Therefore, the temperature rise of the heating coil 6 can be suppressed, and a failure or malfunction of the induction heating cooker C main body such as seizure of the heating coil 6 can be prevented.

  In the present embodiment, the thickness of the heat generating layer 62a directly above the infrared sensor, that is, the silver thickness is increased to increase the amount of silver, but the thickness is the same as the other parts. The same effect can be obtained by increasing the silver amount by increasing the silver density of the heating element directly above that of the other portions.

  Moreover, if the range where temperature rises is made into a ring, if there is a pan in the heating part printed on the top plate 4, the effect can be obtained regardless of the direction of the pan.

  Even when the position of the infrared sensor 10 is not at the position where the magnetic flux density is maximum in the coil, the present invention can obtain the effect.

  In the present embodiment, the heat generating layer 62a is composed of three layers. However, in the case of two or four layers, the same effect can be obtained by increasing the amount of silver in the heat generating layer 62a immediately above the infrared sensor 10 as compared with other portions. .

  The induction heating cooker and the pot for the induction heating cooker according to the present invention can be used to heat a clay pot having a heating element using silver without increasing the temperature of the heating coil. In addition to home induction heating cookers, it is also useful for desktop induction heating cookers.

Schematic sectional view of induction heating cooker and its induction heating cooker pan in Embodiment 1 of the present invention The fragmentary top view of the top plate provided in the induction heating cooking appliance in Embodiment 1 of this invention The bottom perspective view of the pot for induction heating cookers (earthen pot) in Embodiment 1 of the present invention Sectional drawing of the bottom face of the pan for induction heating cookers (earthen pan) in Embodiment 1 of this invention

Explanation of symbols

2 Body 4 Top plate 4a Infrared incident area 6 Heating coil 8 Coil base 10 Infrared sensor 11 Light emitter 12 Substrate 14 Filter 16 Side wall 18 Lens 20 Connector 22 Lead wire 24 Control means 26 Case 26a Opening 28 Operation panel 30 Inverter power supply 42 Conduction Light tube 58 Pan bottom 60 Leg 62 Heating element 62a Heating layer C Induction heating cooker P Earthenware pot (Induction heating cooker pot)

Claims (3)

A main body constituting the outer shell,
A top plate having an infrared incident region that is attached to the upper portion of the main body and that has a cooking vessel placed thereon and transmits infrared rays emitted from the cooking vessel;
A heating coil that is provided below the top plate and generates an induction magnetic field to heat the cooking vessel;
An infrared sensor that is provided below the top plate and detects infrared rays emitted from the cooking container;
A light guide tube that is provided below the infrared incident region and is radiated from the cooking container and guides infrared rays incident from the infrared incident region to the infrared sensor;
Control means for controlling the output of the heating coil based on the output signal of the infrared sensor so that the output signal of the infrared sensor is constant;
Bottom and a pot di previous SL cooking vessel convex leg,
The infrared sensor is disposed at a position different from the center of the heating coil in the radial direction of the inner edge of the heating coil, and the earthen pot generates heat using silver that enables heating by electromagnetic induction heating on the pot bottom And when placed so that the center of the heating element of the earthenware pan is located immediately above the center of the heating coil, the silver amount of the portion located immediately above the infrared sensor is larger than that of the other portions. By doing so,
An induction heating cooker in which a portion located immediately above the infrared sensor has a higher temperature than other portions, and a pan for the induction heating cooker. 2. The induction heating according to claim 1, wherein the configuration in which the silver amount in a portion located immediately above the infrared sensor is increased is configured such that the thickness of the heating element in the portion located immediately above the infrared sensor is thicker than the other portions. Cooker and its induction heating cooker pan. The induction heating cooker pan according to claim 1 or 2, wherein the legs of the clay pot are continuously formed in an annular shape.

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