JP5445089B2 - Induction heating cooker - Google Patents

Description

  The present invention relates to an induction heating cooker that can heat the bottom of a high-viscosity heated object such as curry or stew without burning.

  A conventional induction heating cooker of this type is suitable for an object to be heated by estimating the physical state of the object to be heated from each detected temperature using a plurality of temperature detecting means and controlling the energization to the induction heating coil based on the estimated temperature. It is configured to perform cooking.

JP 2008-052960 A

  However, in the conventional configuration, in the heated object in a state where the liquid is not highly fluid and has a fluidity in a low temperature state and solids are unevenly present in the liquid, the portion detected by the temperature detection means Other than this, there was a problem that scorching would occur.

  This invention solves the said conventional subject, and it aims at providing the induction heating cooking appliance which prevents the burning except the part which a temperature detection means detects.

  In order to solve the above-mentioned conventional problems, the induction heating cooker of the present invention heats the cooking container with the first heating output, and when the bottom temperature detected by the temperature detecting means reaches the first temperature, the first predetermined cooking temperature is obtained. When the predetermined time has elapsed, heating is started again with the first heating output, and when the temperature decrease width within the first predetermined time is less than the first predetermined temperature width, the first temperature is decreased. The second heating temperature is changed to a second temperature that is higher than the first temperature by a second predetermined temperature range and does not cause burning, and the first heating output is changed to a second heating output that is larger than the first heating output. It is a thing.

  By this, in a state where the temperature difference between the bottom and top of the object to be heated is reduced, that is, by making the viscosity difference small and having fluidity, even if the heating temperature is raised, partial burning of the pan bottom is prevented. be able to.

  The induction heating cooker according to the present invention is a part of the bottom of the pan when heating the heated object in a state where the liquid is not viscous and fluid in a low temperature state and solids are unevenly present in the liquid. Can be prevented and warmed up quickly.

The schematic block diagram of the induction heating cooking appliance in embodiment of this invention Change figure of bottom detection temperature of heated object of the same induction heating cooker

1st invention, the top plate which mounts a cooking container, the induction heating coil which is located under the top plate and heats the cooking container, the control means which supplies a high frequency current to the induction heating coil, Temperature detection means for detecting the bottom temperature of the cooking container, and the control means has a curry heating mode, which is an automatic control mode, and starts cooking with a first heating output when heating is started in the curry heating mode. When the container is heated and the bottom temperature detected by the temperature detecting means reaches the first temperature, the heating is stopped for a first predetermined time, and when the predetermined time elapses, the heating is started again with the first heating output. When the temperature decrease width within the first predetermined time is less than the first predetermined temperature width, the first temperature is a temperature that is higher than the first temperature by a second predetermined temperature width and does not cause burning. The temperature difference between the bottom and the top of the object to be heated is reduced by changing to the second temperature and using an induction heating cooker that changes the first heating output to a second heating output larger than the first heating output. In the state, that is, by making the viscosity difference small and having fluidity, even if the heating temperature is changed to be high, partial burning of the pan bottom can be prevented.

  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 configuration diagram of an induction heating cooker according to Embodiment 1 of the present invention.

  FIG. 2: is a change figure of the bottom part detection temperature of the to-be-heated object of the induction heating cooking appliance.

  In the induction heating cooker according to the present embodiment, a cooking container containing the object to be heated 11, for example, a pan 10 is placed on the top plate 12, and a signal from an operation unit (not shown) is controlled by the control means. When sent to 16, the control means 16 controls the operation of the inverter circuit 15, and heats the object to be heated 11 by heat conduction from the cooking vessel 10 that performs induction heating by energizing the induction heating coil 14 with high frequency current.

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

  First, when a user selects a curry heating mode in which a frozen curry, which is a low-temperature solid cooked product 11 to be heated, is put into a cooking container and the frozen curry is thawed, the signal is sent to the control means 16. It is done. Heating is started with the first heating output, and the bottom temperature of the cooking container 10 detected by the temperature detecting means 13 for detecting the infrared rays emitted from the bottom of the cooking container 10 by the infrared sensor and passing through the top plate 12 is predetermined. When the first temperature reaches, for example, 150 ° C., the information is sent from the temperature detection means 13 to the control means 16, the operation of the inverter circuit 15 is controlled by the control means 16, and the first heating output is turned off. Simultaneously with the turn-off, the time measuring means 17 starts measurement for a first predetermined time, for example, one minute, and transmits the heating output to the control means so that the heating output is turned off within the first predetermined time. After the first predetermined time, the control means 16 heats again with the first heating output, and the temperature detection means 13 determines how much the bottom temperature of the cooking container 10 has fallen from the first temperature within the first predetermined time. Detect. When this temperature decrease width is less than the first predetermined temperature width, for example, less than 10 ° C., the temperature difference between the bottom and the top of the article to be heated 11 is small, and the fluidity at the bottom comes out due to the temperature rise. It is determined that the bottom of the cooking container 10 is less likely to be burned even in the state where the solid matter is present in a non-uniform manner, and therefore, the first heating output is larger than the first heating output. After changing to the heating output and continuing the heating, the first temperature, which is the temperature to be reached, is changed to a second predetermined temperature range, for example, a second temperature that is 50 ° C. higher than the first temperature, and after reaching the second temperature The second heating output is intermittently controlled to maintain the second temperature.

On the other hand, when the temperature drop width is equal to or greater than the first predetermined temperature range, the temperature difference between the bottom and top of the article to be heated 11 is large, and the fluidity of the bottom is small, so that solids are unevenly present in the liquid. Since it is judged that it is in a state where it is easy to cause scorching due to being performed, the process proceeds to the step of heating with the first heating output again until the first temperature is reached, and the bottom temperature of the cooking container 10 is the predetermined first temperature. Is reached, the heating is turned off, and this process is repeated until the temperature drop within the first predetermined time becomes less than the first predetermined temperature.

  The second temperature here is a predetermined temperature at which the heated and fluid curry or the like does not burn, for example, 200 ° C. The first temperature is a low temperature state such as curry and has no fluidity, and even if the object to be heated 11 is in a state where solids are unevenly present in the liquid, The temperature that does not cause scorch in the portion of, for example, 150 ° C., is a temperature set lower than the second temperature. In addition, heating may be continued while maintaining the first temperature without changing to the second temperature. However, in order to quickly warm up the entire object to be heated 11, it is efficient and desirable to change to the higher second temperature. .

  As described above, in the present embodiment, after the temperature decrease width within the first predetermined time becomes less than the first predetermined temperature width, the temperature is changed to the predetermined second temperature higher than the predetermined first temperature. It becomes possible to warm the heated object faster than heating at the predetermined first temperature without causing the bottom of the cooking container 10 to burn.

  In FIG. 1, the induction heating coil 14 is described as a single one, but is not limited thereto, and may be configured as a double winding or a multiple winding configuration exceeding two.

  Moreover, although the temperature detection means 13 uses the infrared sensor, you may use other temperature detection elements, such as a thermistor and a thermocouple.

  Further, the temperature detection means 13 is arranged in the space in the center of the induction heating coil 14, but is not limited to this, and may be on the coil. In the induction heating coil having a double or double winding structure, the coil You may arrange between them.

  Moreover, although only one temperature detection means 13 is described, a plurality of temperature detection means 13 may be used. In that case, the temperature detecting means that first reaches the first temperature is employed.

  Further, in FIG. 2, the second heating output is described without a continuous energization state (discontinuation time is clearly specified). However, the duty is set to maintain the second temperature, or the heating output is smaller than the second heating output instead of the interruption, Heating control may be performed with a greater change.

  As described above, the induction heating cooker according to the present invention controls heating while estimating the temperature other than the bottom of the object to be heated. Therefore, even when the object to be heated is in a frozen state, for example, an automatic thawing course or the like It can be applied to such applications.

DESCRIPTION OF SYMBOLS 10 Cooking container 11 To-be-heated object 12 Top plate 13 Temperature detection means 14 Induction heating coil 15 Inverter circuit 16 Control means 17 Time measurement means

Claims (1)

A top plate on which the cooking container is placed, an induction heating coil that is located below the top plate and heats the cooking container, a control means for supplying a high-frequency current to the induction heating coil to control a heating output, and Temperature detecting means for detecting the bottom temperature of the cooking container, and the control means has a curry heating mode which is an automatic control mode, and when heating is started in the curry heating mode, the cooking container with a first heating output When the bottom temperature detected by the temperature detecting means reaches the first temperature, heating is stopped for a first predetermined time, and when the first predetermined time elapses, heating is started again with the first heating output. At the same time, when the temperature decrease width within the first predetermined time is less than the first predetermined temperature width, the first temperature is higher than the first temperature by a second predetermined temperature width and does not cause burning. The addition to changes in second temperature, the induction heating cooker to modify the first heating output to the second heating output is larger than the first heat output is.

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