JP2008004354A - Induction heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an induction heating device capable of properly heating an object to be heated by estimating the temperature of the object to be heated which is contained in a heating vessel based on a plurality of detected temperatures of a vessel placing part or a cooking vessel. <P>SOLUTION: This induction heating cooker is equipped with the heating vessel 2 containing the object 1 to be heated, the vessel placing part 3, an induction heating coil 4, a first temperature detecting means 6, a second temperature detecting means 7, and a control means 8, and switching-on of the induction heating coil 4 is controlled by estimating heating characteristics of the cooking vessel 2 from the temperature difference between the temperatures detected by the first temperature detecting means 6 and the second temperature detecting means 7. Thereby, the object to be heated can be properly heated. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an induction heating cooker that heats a cooking container containing an object to be heated using induction heating means having an induction heating coil.

Conventionally, this type of induction heating cooker uses a cooking output of 3 kW (or when the temperature detected by the temperature detection means reaches a predetermined value (150 ° C.) as a method for determining the type of pan serving as a cooking container and the pan temperature. 2 kW) to 1.6 kW, and it is determined that the rate of change of the detected temperature at that time is a predetermined value or less (a decrease of 3 ° C. or more in 90 seconds), and whether or not the cooking container has a multilayer structure (For example, refer to Patent Document 1) and a method in which a plurality of temperature detection units are installed between the center of the internal heating coil, the external heating coil, and the internal heating coil, and the pan temperature is determined based on the maximum temperature among the detected temperatures. (See, for example, Patent Document 2).
JP 2003-272823 A JP 2006-12606 A

  However, the conventional configuration described in Patent Document 1 is affected by the way the pan is placed, the shape of the pan, or the amount and type of the object to be heated. May occur. Further, in the conventional configuration described in Patent Document 2, detection of the pan temperature with only the maximum temperature signal cannot eliminate erroneous detection due to how the pan is placed, and estimates the temperature of the object to be heated in the cooking vessel. It had the problem that it was difficult.

  The present invention solves the above-described conventional problems, and estimates the temperature of an object to be heated that has entered the cooking container based on a plurality of detected temperatures of the container mounting portion or the cooking container, and is suitable for the object to be heated. The purpose is to do.

  In order to solve the above-described conventional problems, the dielectric heating cooker according to the present invention detects a plurality of temperatures of the container mounting portion or the cooking container facing the induction heating unit, and detects the maximum temperature and the minimum temperature detected by the temperature detection unit. The heat generation characteristic of the cooking container is estimated based on the difference from the temperature, and the induction heating means is controlled.

  Accordingly, the type of the cooking container is determined from the heat generation characteristics of the cooking container, the temperature of the heated object that has entered the cooking container is estimated, and heating suitable for the heated object is performed.

  The induction cooking device of the present invention can determine the type of the cooking container from the heat generation characteristics of the cooking container, estimate the temperature of the heated object that has entered the cooking container, and perform heating suitable for the heated object. .

  1st invention detects the several temperature of the container mounting part which faces an induction heating means, or a cooking container, The heat_generation | fever characteristic of a cooking container is based on the difference of the maximum temperature and minimum temperature which the temperature detection means detected. It estimates and controls induction heating means.

  Thereby, the temperature of the to-be-heated material which entered the cooking container can be estimated, and the heating suitable for the to-be-heated material can be performed.

  In the second invention, in particular, at least one of the temperature detecting means of the first invention detects the temperature of the cooking container or the container mounting portion that does not face the induction heating coil.

  Thereby, the temperature of the low-temperature area | region different from the heat_generation | fever part by an induction heating coil can be measured reliably, and the temperature of to-be-heated material can be estimated with a high precision.

  In a third aspect of the invention, the induction heating coil of the first aspect of the invention has a multi-winding coil configuration, and at least one of the temperature detecting means controls the temperature of the cooking container or container mounting portion facing the gap of the multi-winding coil. It is something to detect.

  Thereby, the temperature of the high temperature area | region of the cooking container or container mounting part which heat | fever-generated by the induction heating coil can be measured reliably, and the temperature of a to-be-heated object can be estimated with a high precision.

  According to a fourth aspect of the present invention, in particular, when the difference between the maximum temperature and the minimum temperature detected by the temperature detection means is greater than a predetermined value, the control means of the first invention is induction heating to alleviate temperature unevenness in the cooking container. The energization to the means is reduced or energized intermittently.

  Thereby, the temperature of a to-be-heated object can be raised without being influenced by the heating characteristic of an induction heating coil, and the heating suitable for a to-be-heated object can be performed.

  According to a fifth aspect of the present invention, in particular, when the difference between the maximum temperature and the minimum temperature detected by the temperature detection means is equal to or less than a predetermined value, the control means of the first invention reduces the electric power supplied to the induction heating means from the initial heating stage. It continues energization while lowering.

  Thereby, time for determining the material of the heating container becomes unnecessary, and heating suitable for the object to be heated can be performed while shortening the heating time.

  In the sixth aspect of the invention, in particular, when the difference between the maximum temperature and the minimum temperature detected by the temperature detection means is greater than a predetermined value, the control means of the first invention sets the minimum temperature to the temperature of the object to be heated in the cooking container. And the electric power supplied to the induction heating means is controlled based on the temperature of the object to be heated.

  Thereby, the temperature of the to-be-heated object in a heating container can be estimated with high precision, and the heating suitable for a to-be-heated object can be performed.

  According to a seventh aspect of the present invention, in particular, when the difference between the maximum temperature and the minimum temperature detected by the temperature detection means is equal to or less than a predetermined value, the control means according to the first invention multiplies the temperature difference by the first coefficient and the cooking container The temperature of the object to be heated is estimated, and the electric power supplied to the induction heating means is controlled based on the temperature of the object to be heated.

  Thereby, the temperature of the to-be-heated object in a heating container can be estimated with high precision, and the heating suitable for a to-be-heated object can be performed.

  In the eighth aspect of the invention, in particular, when the difference between the maximum temperature and the minimum temperature detected by the temperature detection means is larger than a predetermined value, the control means of the first invention sets the minimum temperature to the temperature of the object to be heated in the cooking container. And the energization time to the induction heating means is controlled based on the temperature of the object to be heated.

  Thereby, the temperature of a to-be-heated object can be raised without being influenced by the heating characteristic of an induction heating coil, and the heating suitable for a to-be-heated object can be performed.

  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 is a schematic view of an induction heating cooker according to the first embodiment of the present invention, and FIG. 2 is an enlarged view of a main part of the induction heating cooker.

  1 and 2, in the induction heating cooker, the cooking container 2 containing the article to be heated 1 is placed on the container placing portion 3 and cooking is performed. An induction heating coil 4 for heating the cooking container 2 is disposed below the container placement unit 3. The induction heating coil 4 includes a concentric induction heating coil (outer) 4a and an induction heating coil (inner) 4b. The inverter circuit 5 supplies a high frequency current to the induction heating coil 4. The first temperature detecting means 6 provided at a position facing the clearance of the induction heating coil 4 and the second temperature detecting means 7 provided at a position not facing the induction heating coil 4 are respectively the cooking container 2 and the container mounting. The temperature of the placement unit 3 is measured. In the present embodiment, the first temperature detection means 6 is disposed between the induction heating coil (outside) 4a and the induction heating coil (inside) 4b, and the second temperature detection means 7 is the induction heating coil (inside). Arranged in the center of 4b. The first temperature detection means 6 and the second temperature detection means 7 are composed of a thermistor, various metal resistors, a thermocouple, or an infrared sensor or an optical sensor that measures the temperature of the cooking vessel.

  Detection signals from the first temperature detection means 6 and the second temperature detection means 7 are sent to the control means 8. The control means 8 controls the input power from the inverter circuit 5 to the induction heating coil 4 based on the difference between the detection signals of the first temperature detection means 6 and the second temperature detection means 7.

  The calculation means 9 stores the temperature and amount of the object to be heated 1 and heating conditions suitable for various conditions, or from the detection signals of the first temperature detection means 6 and the second temperature detection means 7, the object to be heated 1. And the temperature of the cooking container 2 is estimated. Further, the input power to the induction heating coil 4 and the energization time are measured.

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

  First, when a heating start signal is sent to the control means 8 from an operation unit (not shown) or the like, the control means 8 starts energizing the induction heating coil 4. The calculation means 9 starts measuring the input power and the energization time to the induction heating coil 4 simultaneously with the start of energization to the induction heating coil 4. When a high-frequency current flows through the induction heating coil 4, a magnetic line is generated, and an eddy current is generated at the bottom of the cooking vessel 2 by the magnetic line. The bottom of the cooking container 4 itself generates heat due to the eddy current.

  The 1st temperature detection means 6 and the 2nd temperature detection means 7 detect the temperature of the cooking container 2 bottom or the container mounting part 3 from an energization start. On the bottom surface of the cooking container 2, the portion facing the clearance of the induction heating coil 4 generates a large amount of heat, and the portion facing the substantially center of the induction heating coil 4 generates a small amount of heat. For this reason, since temperature unevenness occurs on the bottom surface of the cooking container 2, it is difficult to simply estimate the temperature of the object to be heated from the detected temperature information, but the present invention solves this.

  Accordingly, the bottom surface of the cooking container 2 or the container mounting portion 3 has a minimum temperature at the portion in contact with the center of the induction heating coil (inside) 4b, and the induction heating coil (outside) 4a and the induction heating coil (inside). The part which touched between 4b becomes the maximum temperature.

  Next, the relationship between the heat generation characteristics of the induction heating coil 4 and the cooking vessel 2 will be described. In general, a cooking container using a multi-layer metal laminated with a plurality of metals (hereinafter referred to as a multi-layer cooking container) is a cooking container 2 than a cooking container using a single type of metal (hereinafter referred to as a single-layer cooking container). The heat conduction in the bottom thickness direction is poor. As an example of a multilayer metal, there is an example in which a metal (for example, stainless steel) that is easy to induction heat but poor in heat conduction is bonded to a metal (for example, aluminum) that is difficult to inductively heat but has good heat conductivity (for example, aluminum). By laminating a metal having good heat conduction, the heat conduction in the planar direction of the cooking vessel 2 is improved, and as a result, temperature unevenness on the bottom surface of the cooking vessel 2 is reduced.

  On the other hand, when a single-layer cooking container using only a metal that is easily induction-heated is induction-heated, the planar heat conduction of the cooking container 2 is poor, and if energization to the induction heating coil 4 is continued, Temperature unevenness may increase.

  Thus, the first temperature detecting means 6 detects the maximum temperature of the cooking container 2 or the container placing portion 3 facing the induction heating coil 4, and the second temperature detecting means 7 faces the induction heating coil 4. The temperature of the minimum temperature of the cooking container 2 or the container placing part 3 that is not to be detected is detected.

  The calculating means 9 calculates the temperature difference at the bottom of the cooking container 2 detected by the first temperature detecting means 6 and the second temperature detecting means 7 when a predetermined time has elapsed. The timing for calculating the temperature difference (predetermined time) varies according to the input power to the induction heating coil 4.

  When the temperature difference between the first temperature detection means 6 and the second temperature detection means 7 is larger than a predetermined value, the control means 8 determines that the material of the cooking container 2 is a single-layer cooking container that is susceptible to temperature unevenness on the bottom surface. To do. On the other hand, when the temperature difference between the first temperature detection means 6 and the second temperature detection means 7 is equal to or less than a predetermined value, the control means 8 is such that the material of the cooking vessel 2 is good in heat conduction and hardly causes temperature unevenness on the bottom surface. Judged as a multi-layer cooking container.

  In the single-layer cooking container, the temperature unevenness of the bottom surface is likely to be generated, so that the minimum temperature of the cooking container 2 or the container placing unit 3, that is, the temperature of the second temperature detecting means 7 is handled as the temperature of the heated object in the cooking container 2. be able to. On the other hand, in a multi-layered cooking container, since the temperature unevenness of the bottom surface is difficult to be produced, the temperature of the cooking container 2 or the container placing part 3 cannot be directly handled as the temperature of the object to be heated. Therefore, the temperature of the object to be heated is estimated by multiplying the temperature of the first temperature detection means 6 and the second temperature detection means 7 by a predetermined coefficient.

  When it is determined that the cooking container 2 is a single-layer cooking container, the control means 8 reduces or temporarily stops energization to the induction heating coil 4 in order to eliminate the temperature unevenness of the cooking container 2. When the detected temperature (maximum temperature) of the first temperature detecting means 6 is lower than the preset temperature input in advance from the operation unit, it can be determined that the temperature in the cooking container 2 is still lower. Therefore, the control means 8 starts energizing the induction heating coil 4 again, and maintains the set temperature while energizing intermittently.

  Further, when the cooking container 2 is a single layer cooking container, the control means 8 shortens the energization time and input power to the induction heating coil 4 to be shorter than the multilayer cooking container in order to maintain heating while suppressing temperature unevenness. Or reduce.

  On the other hand, when it is determined that the cooking container 2 is a multi-layer cooking container, the control means 8 determines that the cooking container 2 is less likely to cause temperature unevenness, and lowers the electric power supplied to the induction heating coil 4 from the initial stage of heating. While energizing, continue energizing or intermittently energizing. At this time, the energization time can be made longer than in the case of a single-layer cooking container.

  When the calculation means 9 calculates that a predetermined time has elapsed while maintaining the set temperature, the calculation means 9 sends a signal to the control means 8. After receiving the signal from the calculating means 9, the control means 8 stops energizing the induction heating coil 4 and ends the heating. It is also possible for the user to finish heating halfway.

  As described above, according to the present embodiment, a plurality of temperatures of the container mounting portion or the cooking container facing the induction heating coil 4 are detected, and based on the difference between the maximum temperature and the minimum temperature detected by the temperature detection means. Thus, the heat generation characteristics of the cooking container are estimated and the energization of the induction heating coil is controlled, so that heating suitable for the object to be heated can be performed.

  In the present embodiment, the object to be heated is in a liquid state, for example, the temperature of oil, stew or the like can be detected with high accuracy, so that it is possible to provide high convenience for fried food cooking and stewing.

  Further, although the induction heating coil is doubled in the present embodiment, it may have a multiple winding configuration. Two or more first temperature detection means 6 may be installed as long as they are between the induction heating coil (outside) 4a and the induction heating coil (inside) 4b. In this case, however, the cooking container and the temperature of the object to be heated in the cooking container are estimated based on the maximum temperature and the minimum temperature detected by the plurality of temperature detection means. By providing a plurality of temperature detecting means on the concentric circles, the influence of how the cooking container is placed can be eliminated.

  As described above, the induction heating cooker according to the present invention can control the induction heating coil based on the arrangement position of the plurality of temperature detection means and the detection signal of the temperature detection means. It is effective for induction heating cookers and electromagnetic cookers.

Schematic of the induction heating cooker in Embodiment 1 of the present invention. Enlarged view of the main part of the induction heating cooker

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 To-be-heated object 2 Heating container 3 Container mounting part 4 Induction heating coil 4a Induction heating coil (outside)
4b Induction heating coil (inside)
6 First temperature detection means 7 Second temperature detection means 8 Control means

Claims (8)

A cooking container containing an object to be heated; a container placing part for placing the cooking container; and an induction heating means having an induction heating coil that is located below the container placing part and heats the cooking container; Control means for controlling the heating output of the induction heating means, and temperature detection means for detecting a plurality of temperatures of the container mounting portion or the cooking container facing the induction heating means, the control means comprising the temperature An induction heating cooker that estimates heat generation characteristics of the cooking container based on a difference between the maximum temperature and the minimum temperature detected by the detection means and controls the induction heating means. The induction heating cooker according to claim 1, wherein at least one of the temperature detection means detects a temperature of the cooking container or the container mounting portion that does not face the induction heating coil. 2. The induction according to claim 1, wherein the induction heating coil has a multi-winding coil configuration, and at least one of the temperature detection means detects the temperature of the cooking container or the container mounting portion facing the gap of the multi-winding coil. Cooking cooker. When the difference between the maximum temperature and the minimum temperature detected by the temperature detection means is larger than a predetermined value, the control means reduces or intermittently supplies the induction heating means to alleviate temperature unevenness of the cooking container. The induction heating cooker according to claim 1, which is electrically energized. The control means continues energization while lowering the energization power to the induction heating means from the initial stage of heating when the difference between the maximum temperature and the minimum temperature detected by the temperature detection means is less than a predetermined value. The induction heating cooker described in 1. When the difference between the maximum temperature and the minimum temperature detected by the temperature detection unit is greater than a predetermined value, the control unit sets the minimum temperature as the temperature of the heated object in the cooking container, and the temperature of the heated object The induction heating cooker of Claim 1 which controls the electricity supply to the said induction heating means based on. When the difference between the maximum temperature and the minimum temperature detected by the temperature detection means is equal to or less than a predetermined value, the control means multiplies the temperature difference by a first coefficient to obtain the temperature of the object to be heated in the cooking container. The induction heating cooker according to claim 1, wherein the induction heating cooker estimates and controls the electric power supplied to the induction heating means based on the temperature of the object to be heated. When the difference between the maximum temperature and the minimum temperature detected by the temperature detection unit is greater than a predetermined value, the control unit sets the minimum temperature as the temperature of the heated object in the cooking container, and the temperature of the heated object The induction heating cooker according to claim 1, wherein the energization time to the induction heating means is controlled based on the above.

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