JP2008059879A - Induction heating cooking device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain similar heating efficiency and roasted states by all induction heating coils, by eliminating necessity for a user to properly use three induction heating coils on the right and left of the front side and the center of the back side in a device body depending on the sizes of pans for cooking. <P>SOLUTION: In this induction heating cooking device equipped with a right induction heating coil 13a, a left induction heating coil 13b, and a center induction heating coil 13c on the right and left of the front side of the device body 2 and on the almost center part of the back side, the three ring-shaped induction heating coils 13a, 13b, 13c are set at almost the same size, and three pan placing parts 6a, 6b, 6c formed on a top plate 3 correspondingly to the induction heating coils 13a, 13b, 13c are set at almost the same size as that of the induction heating coils 13a, 13b, 13c. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an induction heating cooker that includes annular induction heating coils at the front left and right sides and the rear side center in a main body, and a heat-resistant glass top plate is disposed on the upper surface thereof.

  Conventionally, as a cooking device for heating a cooking pan, a heating cooking device using a flame such as a gas range as a heat source has occupied the majority.

  In recent years, the trend of so-called all-electric housing, such as electrification of all residential equipment, has become remarkable. As part of this, an electromagnetic induction heating cooker that uses the eddy current of the pot to heat the pot itself has been reviewed.

  As an electromagnetic conduction cooker, two heat generating parts arranged on the left and right sides of the front side in the main body are induction heating type, and heat generated in the rear side central part between these heat generating parts. A heater-type cooking device whose part uses a radiant heater or the like is common.

  By the way, the heater-type heat generating portion disposed in the central portion on the rear side in the main body is of the heater type, and therefore is a type that heats the pan by heat conduction. This is a structure in which the top plate on which the pan is placed is heated by the heat generating portion and the heat is transmitted to the pan. For this reason, there is a drawback that the top plate becomes hot. This is contrary to the advantage of the induction heating method in which the heat generating portion and its surroundings do not become hot.

  Therefore, a cooker that uses all three heat generating parts as an induction heating method is desired, and in fact, Patent Documents 1, 2, 3, and 4 also show that the heat generating part provided in the central part on the rear side of the main body is also induction heated. There is described a cooking device in which all the heat generating parts are induction heating type.

  These induction heating cookers are the main cooking places, the induction heating coils on the front side left and right inside the main body, the heating power is as large as about 3 kW, the functions are substantial, fried food, fried food, automatic Automatic cooking such as boiling water and automatic cooking is possible. Further, the coil diameter is approximately 200 mm so as to correspond to approximately 200 mm, which is the size of the bottom of a cooking pot generally used.

  On the other hand, the induction heating coil in the central portion on the rear side in the main body is far from the user and is subject to user-friendliness. For this purpose, a necessary heating power of about 1.6 kw, which is smaller than 3 kw of the induction heating coils on the left and right sides of the front side of the main body, is sufficient, and the coil diameter is as small as about 150 mm.

JP 2004-319350 A JP-A-3-114173 JP 2002-8842 A JP 2005-243535 A

  In the above-described prior art, the annular induction heating coils provided on the left and right of the front side in the main body have a coil diameter of approximately 200 mm so as to correspond to the pan bottom size of a commonly used cooking pan. When cooking fried foods, stir-fried foods, automatic rice cooking, etc., heating unevenness, baking unevenness, etc. do not occur, and problems such as reduced heating efficiency do not occur even in boiling water.

  On the other hand, the induction heating coil in the central part on the rear side in the main body has a heating power of about 1.6 kw as described above, and the coil diameter is as small as about 150 mm. The cooking pot that can be prepared is the main, but the pot size of the cooking pot that is generally used is about 200mm in diameter, so it tends to cause uneven heating at the center and the outer periphery of the pot, boiling water, etc. In this case, there is a problem that the heating efficiency is lowered.

  In addition, when grilled food is cooked in a cooking pan, there is also a problem that uneven baking is likely to occur, in that the baking is relatively strong in the center portion and the outer peripheral portion is weak.

  The present invention has been made in order to solve the above-mentioned problems. In claim 1, the annular induction heating coils disposed on the left and right sides of the front surface in the main body and the annular induction coils disposed on the rear side central portion are provided. In the induction heating cooker comprising an induction heating coil, a top plate that covers the upper surfaces of these three induction heating coils and on which a cooking pan is placed, and an inverter circuit that supplies electric power to the induction heating coil, the three annular rings The induction heating coil is set to a size of approximately the same size, and the three pan mounting portions formed on the top plate corresponding to the induction heating coil are also drawn to a size of approximately the same size as the induction heating coil. Is.

  According to a second aspect of the present invention, the diameters of the three induction heating coils are set to about 200 mm, and the diameters of the three pan mounting portions formed on the top plate are also set to about 200 mm.

  In the present invention, as described above, the annular induction heating coils arranged on the left and right sides of the front surface in the main body and the annular induction heating coils arranged in the center on the rear side are set to substantially the same size. Since the three pan mounting portions formed on the top plate corresponding to the induction heating coils are also drawn to the same size, the size of the pan cooked by the user for all three induction heating coils There is no need to use them separately.

  Moreover, even when using the induction heating coil of the rear center part, it is the same as the induction heating coil of the front side right and left by mounting the pot to cook on the pan mounting part corresponding to the induction heating coil of the rear side center part. The heating efficiency and baking can be obtained.

  Furthermore, since a cooking pot having a pan bottom size of about 200 mm in diameter, which is generally used, can be used, the user is less likely to be restricted by the cooking pan, and the same pan is used with three induction heating coils. It can be used and is very easy to use.

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

  1 to 4 show an embodiment of the induction heating cooker of the present invention. The cooker shown in FIG. 1 is a built-in induction heating cooker provided with pan mounting portions 6a, 6b, and 6c at three locations on the top plate 3, as will be described in detail below.

  In addition, the present Example is not limited to the built-in type that fits in the kitchen, but may be a stationary heating cooker that is placed in the kitchen.

  The main body 2 of the heating cooker is incorporated by being dropped from the upper surface of the system kitchen 1 and installed. After the installation, a roaster unit 4 and an operation unit panel 5, which will be described later, can be operated from the front part of the system kitchen 1.

  A cooking pan (not shown) for cooking is placed on a top plate 3 made of heat-resistant glass or the like disposed on the upper surface of the main body 2.

  The cooking pan can be cooked by being placed on the annular pan placing portion 6 drawn on the top plate 3. The placement portion 6 is provided with a placement portion right 6a and a placement portion left 6b on the front surface side of the top plate 3, and a placement portion center 6c is located at the rear central portion between the placement portions 6a and 6b. Has been placed. And in the upper part of the main body 2 corresponding to the pan mounting portions 6a, 6b, 6c on the lower surface of the top plate 3, an induction heating coil right 13a, an induction heating coil left 13b, an induction heating coil center 13c for heating the cooking pan are provided. Are installed. The pan mounting portions 6a, 6b, and 6c have an annular diameter H2 of approximately 200 mm in accordance with the coil diameters of the induction heating coil right 13a, induction heating coil left 13b, and induction heating coil center 13c described in detail below. It is drawn in.

  Next, details of the induction heating coil right 13a, the induction heating coil left 13b, and the induction heating coil center 13c will be described with reference to FIG.

  The induction heating coil right 13a is formed by a double coil of an annular inner induction heating coil 13a1 and an outer induction heating coil 13a2 arranged with a gap 15 on the outer side thereof, and the induction heating coil left 13b is formed on an annular inner side. The induction heating coil 13b1 is formed of a double coil of an outer induction heating coil 13b2 arranged with a gap 15 on the outer side thereof, and the induction heating coil center 13c is further formed with an annular inner induction heating coil 13c1 and an outer side thereof. It is formed of a double coil of the outer induction heating coil 13c2 arranged with a gap 15 provided. The reason for making it a double coil is to disperse the magnetic flux generated by both coils to make the temperature of the pan uniform.

  The induction heating coil right 13a, the induction heating coil left 13b, and the induction heating coil center 13c all have coil diameters H1 of the outermost outer induction heating coil 13a2, the outer induction heating coil 13b2, and the outer induction heating coil 13c2. It is set to approximately 200 mm in accordance with the pan bottom dimension (diameter approximately 200 mm) of the most commonly used cooking pan. Of course, when the induction heating coil right 13a, the induction heating coil left 13b, and the induction heating coil center 13c are formed of so-called single coils that are not divided into inner and outer double coils, the coil diameter of the single coil is approximately Set to 200 mm.

  Among the induction heating coil right 13a, the induction heating coil left 13b, and the induction heating coil center 13c, the induction heating coil center 13c is a place that is difficult to reach by the user. For this reason, when a cooking pan is placed on the induction heating coil right 13a and the induction heating coil left 13b in front, when reaching the induction heating coil center 13c, the induction heating coil right 13a and the induction heating coil left 13b are moved. Steam generated during cooking from the placed cooking pan hits the hand, and cooking by moving the hand at the induction heating coil center 13c is difficult to perform. Therefore, the type of cooking performed at the induction heating coil center 13c is suitable for cooking that does not require much movement by the cook, mainly cooking such as stew or heat retention. In addition, since stew and heat retention require only a small heating power, the heating power of the induction heating coil center 13c is set so that it can be widely adjusted from strong to weak, such as a high heat at first and a low heat from the middle. Specifically, the induction heating coil center 13c may be set to about 3 kW, which is the same as the induction heating coil right 13a and the induction heating coil left 13b, and may be set to about 1.6 kW from the beginning.

  In FIG. 3, the induction heating coil right 13a and the induction heating coil left 13b are a first temperature detector that detects the temperature of the central portion of the cooking pot at the center of the inner induction heating coil 13a1 and the inner induction heating coil 13b1. 16, a second temperature detector 17 is provided in each gap 15, and the induction heating coil center 13c is provided with a temperature detector 18 at the center of the annular inner induction heating coil 13c1. Of course, the first temperature detector 16, the second temperature detector 17, and the temperature detector 18 are installed in close contact with the lower surface of the top plate 3.

  Thereby, the temperature detection of the pan during automatic cooking or the like is performed by the first temperature detector 16, the second temperature detector 17, and the temperature detector 18 through the top plate 3.

  In addition, the induction heating coil right 13a, the induction heating coil left 13b, and the induction heating coil center 13c employ litz wires to suppress the skin effect. A voltage of several tens of kHz and several hundreds of volts is applied to the induction heating coil right 13a, the induction heating coil left 13b, and the induction heating coil center 13c from the inverter means 72 described later for heating the cooking pan.

  1 and 2, a frame 14 for protecting the end face is provided around the top plate 3. The frame 14 includes a frame front 14a attached to the upper upper edge in front of the top plate 3, a frame rear 14b attached to the rear upper edge of the plate 3, a frame right 14c attached to the right upper edge, and a left upper edge. It is composed of a left frame 14d to be attached. In this example, the frame is divided into 4 pieces, but it can be integrated or 2 pieces or any number of pieces, and it is not necessary to attach it to the 4 sides of the plate 3, only in front of the plate 3, only in the back, front and back Only two sides of the left or right side may be used.

  Inside the main body 2, the induction heating coil right 13a, the induction heating coil left 13b, the induction heating coil center 13c and electronic components (not shown) which are the heat generating members described above are provided. An intake port 7 for sucking air from the outside is provided on the right side of the rear upper surface of the main body 2. The intake port 7 is also located on the right side of the exhaust port 8 provided on the left side of the rear upper surface of the housing 2.

  The air sucked through the air inlet 7 is discharged from the air outlet 8 to the outside of the main body 2 after cooling the induction heating coil right 13a, the induction heating coil left 13b, the induction heating coil center 13c and the electronic parts that generate heat inside the main body 2. Is done. Further, waste heat from the roaster section 4 described later is also discharged from the exhaust port 8 at the same time.

  The roaster portion 4 is for baking fish, pizza, etc., and is disposed on the left or right side of the front surface of the main body 2 (left side in the present embodiment), and on the front side, a roaster door 32 that allows you to look into the burnt condition inside, The roaster door 32 is provided with a handle 11. Note that the roaster section 4 is not dedicated to grilled fish and may be called a grill or an oven.

  9 is an upper surface operation unit, which is composed of a plurality of tact switches, and is provided on the front frame 14a. The heating power adjustment of the induction heating coil right 13a, the induction heating coil left 13b, the induction heating coil center 13c and the setting of the cooking timer It can be used to call the cooking menu, set the temperature, boiled food, automatic rice cooking, fried food cooking, start and stop heating, etc. Easy operation on the top.

  Reference numeral 10 denotes an upper surface display unit, which is provided on the front surface side of the top plate 3 along the upper surface operation unit 9. The user can know the thermal power setting, cooking menu, timer value, cooking temperature, etc. set in the upper surface operation unit 9. Display easily.

  Next, the control will be briefly described with reference to FIG. Note that the control of the roaster section 4 is not directly related to the present invention, and is not shown in the figure.

  The operation / display unit 75 includes the upper surface operation unit 9 and the upper surface display unit 10 described so far. Menus, thermal power information, cooking start / off information, etc. input by operating the operation / display unit 75 are sent to the control means 74 as an input signal 80, and information recognized by the control means 74, processing status such as cooking progress, etc. Is sent to the operation / display unit 75 as a display signal 79 and displayed on the upper surface display unit 10 or the like.

  The control means 74 controls each heating part based on the contents set by the operation / display part 75 and a program such as automatic cooking incorporated in advance. Based on the set contents, cooking start / stop and heating power setting information is sent to an inverter control means 73 to be described later via a control signal 78.

  The inverter control unit 73 sets power to the induction heating coil right 13a, the induction heating coil left 13b, and the induction heating coil center 13c, and starts and stops energization based on an instruction from the control unit 74. Further, the control means 74 includes a first temperature detector 16 and a second temperature detector 17 provided on the induction heating coil right 13a and the induction heating coil right 13b, and a temperature detector 18 provided on the induction heating coil center 13c. The control signal 78 carrying the temperature information is received, and the inverter 72 is controlled by sending an inverter control signal 76 to the inverter 72. The induction heating coil right 13a, the induction heating coil right 13b, the induction heating coil center The power consumption of the 13c heating coil 13 is monitored and corrected.

  About monitoring and correcting the heating power of the induction heating coil right 13a, the induction heating coil right 13b, and the induction heating coil center 13c, the input current and the input voltage of each heating coil 13 sent from the inverter 72 by the detection signal 77 are used. The power consumption is calculated, and the inverter 72 is controlled by the inverter control signal 76 so that the heating power becomes a set value.

  The inverter 72 is a means for supplying thermal power to the induction heating coil right 13a, the induction heating coil right 13b, and the induction heating coil center 13c. The inverter 72 supplies power to the heating coil 13 based on an instruction from the inverter control means 73. Do. Similarly to the inverter control means 73, the inverter 72 is provided for each of the induction heating coil right 13a, the induction heating coil left 13b, and the induction heating coil center 13c, and is provided with an inverter right 72a, an inverter left 72b, and an inverter center 72c. ing. Then, the input voltage and input current of each heating coil 13 a, 13 b, 13 c are detected and placed on each detection signal 77 and sent to the inverter control means 73.

  The present embodiment has the above configuration, and the operation thereof will be described next.

  As an example, a case where the user places and heats the cooking pot 20 on the placement unit right 6a will be described.

  First, when the heating key of the upper surface operation unit 9 is pressed, the pressed key signal becomes an input signal 80 and is sent to the control means 74. The control means 74 recognizes that the heating power key has been input, and this content Is transmitted to the operation display unit 75 as a display signal 79, and the lamp of the upper surface display unit 10 is turned on.

  Next, when the OFF / ON key of the upper surface operation unit 9 is pressed, the lamp is turned on through the same transmission path (hereinafter, description of the same signal path is omitted), and heating is started.

  When the control means 74 instructs the start of cooking, the control signal right 78a transmits the thermal power set to the inverter control means right 73a, and the inverter control means right 73a that receives this transmits the thermal power set to the inverter right 72a so that it becomes the set thermal power. The power control of the induction heating coil right 13a is performed. The inverter right 72a carries the detected values of the input voltage and input current on the detection signal right 77a and transmits them to the inverter control means right 73a. The inverter control means right 73a calculates the power consumption from the detected values, and the set thermal power is consumed. The power control of the induction heating coil right 13a is performed so as to be electric power (the description of the same signal path is omitted hereinafter).

  Cooking is performed by the above-described operation. In these operations, the cooking pan is placed on the placement portion left 6b and the placement portion center 6c and heated by the induction heating coil left 13b and the induction heating coil center 13c. The same is true in some cases.

  Next, induction heating coil right 13a, induction heating coil left 13b, induction heating coil center 13c, induction heating coil right 13a, induction heating coil left 13b, first temperature detector 16, second temperature detection The relationship with the temperature detector 18 provided in the vessel 17 and the induction heating coil center 13c will be described.

  First, a case where the user places a cooking pan on the placement part right 6a of the top plate 3 and heats it will be described.

  The induction heating coil right 13a corresponding to the placement part right 6a of the top plate 3 described above has a coil diameter of about 200 mm and a heating power of about 3 kW, so when a cooking pan having a pan bottom diameter of about 200 mm is used, The gap 15 is maintained between the inner induction heating coil 13a1 and the outer induction heating coil 13a2 so as to disperse the magnetic flux generated by both coils so as to equalize the temperature of the pan. The temperature of the peripheral part rises faster than the temperature of the central part of the cooking pan, resulting in a high temperature.

  Therefore, the temperature around the pan where the temperature rises quickly is detected by the second temperature detector 17 provided in the gap 15 between the inner induction heating coil 13a1 and the outer induction heating coil 13a2, and the temperature information is detected signal. As the right 77a, the inverter right 72a is sent to the inverter control means right 73a, and the control signal right 78a is sent to the control means 74.

  As a result, the control means 74 sends the control signal right 78a to the inverter control means right 73a through the reverse route to the above, and further controls the inverter 72 by sending the detection signal right 77a to the inverter 72, thereby induction heating. It correct | amends in the direction which reduces the electric power of the coil right 13a, and suppresses the local temperature rise of a cooking pan.

  Thereafter, when the cooking pot is heated, the temperature at the bottom of the cooking pot becomes uniform, and the bottom of the cooking pot is heated by the first temperature detector 16 and the second temperature detector 17 provided at the center of the inner induction heating coil 13a1. The temperature is detected and supplied to the induction heating coil right 13a by the control means 74 while controlling the electric power.

  Moreover, the 1st temperature detector 16 and the 2nd temperature detector 17 detect the curvature state of the center part of the pan bottom of the cooking pan 20 and a peripheral part other than the above, a small pan, etc. The control means 74 controls the thermal power corresponding to the pots having different diameters.

  On the other hand, when the user puts a cooking pan on the placing portion center 6c of the top plate 3 and heats it, the cooking content is boiling, keeping warm, stewing, etc., so the temperature of the central portion of the inner induction heating coil 13c1 is detected. The temperature of the cooking pan can be sufficiently accurately captured by the vessel 18, and automatic cooking such as detection of abnormal temperature rise and heat retention and stew can be enabled.

  The heating power control of the induction heating coil center 13c is performed by the inverter center 72c, the inverter control means center 73c, and the control means 74 shown in FIG. 4, which are the induction heating coils described above. This is the same as the case of the right 13a, and is omitted.

  Next, cooking in a cooking pan used when cooking is performed in the induction heating coil right 13a, the induction heating coil left 13b, and the induction heating coil center 13c, particularly cooking in the pan used in the induction heating coil center 13 will be described.

  As described above, the annular induction heating coil right 13a, the induction heating coil left 13b, and the annular induction heating coil center 13c arranged in the rear central portion are arranged on the front side in the main body 2 and have substantially the same size. The three annular pan mounting portions right 6a, the pan mounting portion left 6b, and the pan mounting portion center formed on the top plate 3 corresponding to these induction heating coils 13a, 13b, 13c. 6c is also drawn to the same size. Therefore, the user does not have to use different sizes of cooking pots when using any of the three induction heating coils 13a, 13b, and 13c, which improves usability.

  In addition, when using the induction heating coil center 13c in the rear center part for cooking and keeping warm, a cooking pot having a pan bottom size generally used can be used. Even when heating unevenness occurs in the outer peripheral portion or when boiling hot water, the heating efficiency does not decrease.

  In addition, when the pottery is cooked in a pan, there is no occurrence of uneven baking in which the center portion is relatively strong and the outer peripheral portion is weak.

  Furthermore, the coil diameter of the annular induction heating coil center 13c arranged at the rear side center is set to about 200 mm in accordance with a generally used cooking pot having a pan bottom size of about 200 mm. The person is less restricted by the pan during cooking, and can use the same pan with the three induction heating coils 13a, 13b, 13c, which improves usability.

It is a perspective view of the state which stored the built-in type induction heating cooking appliance concerning the present invention in the system kitchen. It is explanatory drawing which shows the upper surface of the induction heating cooking appliance. It is explanatory drawing which shows the state which removes the top plate of the upper surface of the same induction heating cooking appliance, and can see an induction heating coil. It is a control circuit diagram of the induction heating cooker.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... System kitchen, 2 ... Main body, 3 ... Top plate, 6 ... Pan mounting part, 9 ... Upper surface operation part, 10 ... Upper surface display part, 13a ... Induction heating coil right, 13b ... Induction heating coil left, 13c ... Induction Heating coil center, 16 ... first temperature detector, 17 ... second temperature detector, 18 ... temperature detector, 72 ... inverter, 73 ... inverter control means, 74 ... control means, 75 ... operation / display section.

Claims (2)

  An annular induction heating coil disposed on the left and right sides of the front side of the main body, an annular induction heating coil disposed in the central portion on the rear side, and a top plate for covering the upper surface of these three induction heating coils and placing a cooking pan And an inverter circuit for supplying electric power to the induction heating coil, wherein the three annular induction heating coils are set to substantially the same size and correspond to the induction heating coil. An induction heating cooker characterized in that the three pan mounting portions formed on the top plate are also drawn to the same size as the induction heating coil. 2. The induction heating cooking according to claim 1, wherein the diameter of the three induction heating coils is set to about 200 mm, and the diameter of the three pan mounting portions formed on the top plate is also set to about 200 mm. vessel.

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