JP2007335235A - Induction heating cooker - Google Patents

Abstract

To provide an induction heating cooker that quickly suppresses the heating power against empty cooking of a cooker and prevents damage to a pan or an airframe.
SOLUTION: An induction heating cooker can be provided with a temperature sensor at the lower part of the highest temperature position of the cooker, and quickly suppresses the thermal power against empty cooking of the cooker and prevents damage to the pan and the machine body. It becomes possible to do.
[Selection] Figure 1

Description

  The present invention relates to an induction heating cooker that can accurately measure the temperature on a top plate.

  In recent years, induction heating cookers have been increasing in thermal power, and as a result, it has become necessary to quickly suppress thermal power and prevent damage to pans and airframes due to sudden temperature changes caused by empty baking of cookers such as pans. ing.

  Conventionally, the heating coil of this type of induction heating cooker has been mounted horizontally, and the temperature sensor has been disposed at the center or the outer periphery of the heating coil (see, for example, Patent Document 1).

FIG. 4 shows a conventional induction heating cooker described in Patent Document 1. In FIG. As shown in FIG. 4, the conventional induction heating cooker has a heating coil 101 for heating the cooking device 103 and a temperature sensor 102 provided at the center or outer periphery of the heating coil 101.
JP 2005-141962 A

  However, in the above-described conventional configuration, it is a necessary condition for quickly suppressing the thermal power at the time of baking, and it is possible to predict and arrange the temperature sensor at the lower part of the highest temperature position of the cooker heated by the heating coil. It had the problem of being difficult.

  The present invention solves the above-mentioned conventional problems. A top plate is provided on the upper surface of the main body, a heating coil is provided below the top plate, and the heating coil is supported on the substantially horizontal top plate. A coil mounting portion that keeps a distance from the coil constant, and a projection portion that projects a part of the heating coil toward the top plate side, and a first temperature that measures the temperature of the top plate in the vicinity of the projection portion By providing the sensor and the second temperature sensor at a place other than the protruding portion, the first temperature sensor can be provided at the lower part of the highest temperature position of the cooking device. It is possible to quickly control the heating power and prevent damage to pans and aircraft, and at the same time, by controlling the temperature other than when baking with the second temperature sensor that is not easily affected by heating power, automatic cooking such as automatic water heating is possible Induction heating cooker An object of the present invention is to.

  In order to solve the above-mentioned conventional problems, the induction heating cooking of the present invention is provided with a top plate on the top surface of the main body, a heating coil below the top plate, and the heating plate supporting the heating coil on the top plate in a substantially horizontal state. On the other hand, a coil mounting part that keeps the distance from the heating coil constant, and a projection part that projects a part of the heating coil to the top plate side are provided, and the temperature of the top plate is measured in the vicinity of the projection part. By providing the first temperature sensor and the second temperature sensor at a place other than the protrusion, the first temperature sensor can be provided at the lower part of the highest temperature position of the cooker. Automatic heating, such as automatic water heating, is achieved by controlling the temperature other than when baking with the second temperature sensor, which is less susceptible to heating, and at the same time preventing the damage to pans and aircraft, etc. Can cook .

  The induction heating cooker according to the present invention can be provided with a temperature sensor at the lower part of the highest temperature position of the cooker, and quickly suppresses the thermal power against empty cooking of the cooker and prevents damage to the pan or the machine body. An induction heating cooker can be provided.

  In the first aspect of the present invention, a top plate is provided on the upper surface of the main body, and a heating coil is supported below the top plate, and the distance between the heating coil and the heating plate is maintained constant with respect to the substantially horizontal top plate. A coil mounting portion, a projection portion that projects a part of the heating coil toward the top plate side, a first temperature sensor that measures the temperature of the top plate in the vicinity of the projection portion, and other than the projection portion By providing a second temperature sensor at the location, the thermal power is quickly suppressed against empty cooking of the cooker, preventing damage to pans and aircraft, etc. By performing temperature control other than during baking, automatic cooking such as automatic water heating can be performed.

  In the second invention, the heating coil is composed of an inner coil and an outer coil, the inner coil is protruded toward the top plate with respect to the outer coil, and the first temperature sensor is placed at the center of the inner coil. By quickly controlling the thermal power against baking of the cooker and preventing damage to pans and aircraft, etc., while controlling the temperature other than when baking with the second temperature sensor that is not easily affected by thermal power Automatic cooking such as automatic water heating can be done.

  In a third aspect of the invention, the first temperature sensor is used for preventing overheating, and the second temperature sensor is used for automatic temperature control. Automatic cooking such as automatic water heating can be performed by preventing temperature damage other than air baking with the second temperature sensor that is not easily affected by thermal power, while preventing damage to the aircraft.

  In a fourth aspect of the invention, the first temperature sensor is heated by the magnetic flux generated by the heating coil by providing a cylindrical ferrite between the inner coil and the first temperature sensor. This makes it possible to measure the temperature of the top plate with high accuracy, and quickly suppresses the thermal power against empty cooking of the cooker to prevent damage to pans and aircraft, while at the same time being less susceptible to thermal power. By performing temperature control other than when baking with the second temperature sensor, automatic cooking such as automatic water heating can be performed.

  In the fifth aspect of the invention, since at least one of the first temperature sensor and the second temperature sensor is a non-contact type, it is possible to accurately measure the temperature of the top plate. Automatic heating, etc. by controlling the temperature other than when baking with a second temperature sensor that is less susceptible to heating, while simultaneously suppressing thermal power and preventing damage to pans and aircraft etc. Can cook automatically.

  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 cross-sectional view showing the configuration of the induction heating cooker according to the first embodiment of the present invention, and FIG. 2 is a schematic diagram of the main points showing the configuration of the induction heating cooker.

  1 and 2, a top plate 2 is provided on the upper surface of one main body, and a heating coil 4 supported by a coil holder 3 is disposed below the top plate 2, and the distance between the top plate 2 and the heating coil 4 is constant. It keeps in. The heating coil 4 has a double coil shape divided into an inner coil 4a and an outer coil 4b. The heating coil 4 is driven and controlled by a frequency conversion circuit 7 such as an inverter circuit. The inner coil 4a and the outer coil 4b are driven and controlled by separate frequency conversion circuits 7, so that fine control is possible with various cooking performances. A temperature sensor that detects the temperature of the cooking device 9 such as a pan placed on the top plate 2 via the top plate 2 is held by the coil holder 3 and is a first temperature placed at the center of the inner coil 4a. A sensor 10 and a second temperature sensor 11 disposed between the inner coil 4a and the outer coil 4b are provided. The first temperature sensor 10 and the second temperature sensor 11 are always urged to the top plate 2 by a spring or the like, and are composed of a resistance element such as a thermistor or a bimetal type thermostat. Among the heating coils 4 supported by the coil holder 3, the inner coil 4a is disposed near the top plate 2 in the vertical direction with respect to the outer coil 4b. Further, a ferrite 12 is provided between the inner coil 4 a and the first temperature sensor 10.

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

  When a high frequency current is supplied to the heating coil 4 from the frequency conversion circuit 7, a magnetic flux is generated from the heating coil 4, and the magnetic field is linked to the cooking device 9 placed on the top 2, and the cooking device 9 is swirled. An electric current is generated and the pan is heated. The temperature of the cooking device 9 is transmitted to the top plate 2 and transmitted to the first temperature sensor 10 that is biased to the top plate 2. The frequency conversion circuit 7 controls the supply of the high-frequency current to the heating coil 4 according to the situation of the first temperature sensor 10. When the temperature sensor 10 exceeds a certain temperature, the high-frequency current to the heating coil 4 is controlled. It functions as an overtemperature prevention device that completely stops the supply. Further, the second temperature sensor 11 performs the same operation as that of the first temperature sensor, but does not have a function as an overheat prevention device, and mainly performs temperature adjustment. The cooker 9 generates more heat at the portion heated by the inner coil 4a and the portion heated by the inner coil 4a due to the difference in eddy currents generated when heated by the outer coil 4b. Since the first temperature sensor 10 is arranged in the inner diameter portion where the heat generation of the inner coil 4a is increased most, even if the cooking device 9 performs an empty baking, the heating power is quickly suppressed and the cooking device 9 or the machine body is suppressed. Damage can be prevented. In the present embodiment, the inner coil 4a is close to the top plate side, but the outer coil 4b is close to the top plate 2 side, the first temperature sensor 10 is disposed in the vicinity of the outer coil 4b, and the second coil The temperature sensor 11 may be disposed in the vicinity of the inner coil 4a. Alternatively, a part of the coil may be protruded toward the top plate 2 and the first temperature sensor 10 may be disposed in the vicinity of the protrusion. In this case, the second temperature sensor 11 is disposed avoiding the vicinity of the protrusion. Also, it does not have to be a double-wound coil shape. By providing the ferrite 12 between the inner coil 4a and the first temperature sensor 10, the first temperature sensor 10 can be prevented from being heated by the magnetic flux generated by the inner coil 4a, and the temperature of the top plate 2 can be accurately measured. It becomes possible to measure well. The ferrite 12 has a substantially concentric shape with the heating coil or a closed shape surrounding the first temperature sensor. If a part of the ferrite 12 is between the first temperature sensor 10 and the inner coil 4a, the same effect can be obtained. The upper surface of the inner coil 4a of the cooking device 9 is likely to rise in temperature, and it is desirable that the first temperature sensor 10 for measuring a rapid temperature rise such as baking is disposed through the top plate 2, and also when baking. It is most desirable to arrange it in the vicinity of the outer coil 4b that is not easily affected by heating in order to reliably measure the temperature inside the cooker 9 in a normal state other than the above.

(Embodiment 2)
FIG. 3 is a cross-sectional view showing the configuration of the induction heating cooker in the second embodiment of the present invention.

  In FIG. 3, the first temperature sensor 10 is a non-contact temperature sensor that uses infrared rays or the like that are generally more sensitive than the thermistor, and can accurately measure the temperature of the top plate 2. By controlling the thermal power quickly with respect to the baking of the cooking device 9 to prevent damage to the pan and the aircraft, etc., and at the same time performing temperature control other than when baking with the second temperature sensor 11 that is not easily affected by the thermal power, Automatic cooking such as automatic water heating can be performed. Any temperature sensor may be a non-contact type.

  As described above, the induction heating cooker according to the present invention can be provided with a temperature sensor at the lower part of the highest temperature position of the cooker, and quickly suppresses the heating power against empty cooking of the cooker, such as a pan or an airframe. Therefore, it can be applied to uses such as a cooker or a rice cooker using induction heating.

Sectional drawing which shows the structure of the induction heating cooking appliance in the 1st Embodiment of this invention Schematic of the remarks which show the structure of the induction heating cooking appliance in the 1st Embodiment of this invention. Sectional drawing which shows the structure of the induction heating cooking appliance in the 2nd Embodiment of this invention. Sectional view of a conventional induction heating cooker

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Top plate 3 Coil holder 4 Heating coil 4a Inner coil 4b Outer coil 7 Frequency conversion circuit 9 Cooker 10 First temperature sensor 11 Second temperature sensor 12 Ferrite

Claims (5)

A top plate is provided on the top surface of the main body, a heating coil below the top plate, a coil mounting portion that supports the heating coil and keeps the distance from the heating coil constant with respect to the top plate in a substantially horizontal state, Provided with a protruding portion in which a part of the heating coil protrudes toward the top plate, a first temperature sensor for measuring the temperature of the top plate in the vicinity of the protruding portion, and a second temperature at a place other than the protruding portion. An induction heating cooker characterized by providing a sensor. The heating coil is constituted by an inner coil and an outer coil, the inner coil is protruded toward the top plate with respect to the outer coil, and a first temperature sensor is placed at the center of the inner coil. Induction heating cooker. The induction heating cooker according to claim 1, wherein the first temperature sensor is used to prevent overheating, and the second temperature sensor is used for automatic temperature control. The induction heating cooker according to claim 1, wherein a columnar ferrite is provided between the inner coil and the first temperature sensor. The induction heating cooker according to claim 1, wherein at least one of the first temperature sensor and the second temperature sensor is a non-contact type.