JP4425881B2 - Induction heating cooker - Google Patents

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 increased in thermal power, and as a result, it has become necessary to quickly suppress thermal power against sudden temperature changes caused by baking of cooking appliances such as pans to prevent damage to pans and aircraft. ing.

Conventionally, the heating coil of this type of induction heating cooker has been mounted horizontally, and the temperature sensor has been arranged 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. As shown 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 is above problems solves the aims to provide an induction heating cooker that prevents damage such as pots and airframe suppressed quickly fired against baking pan.

In order to solve the above-described conventional problems, an induction heating cooker according to the present invention includes a top plate provided on the upper surface of a main body, an inner coil provided below the top plate, and an outer coil outside the inner coil. A heating coil that heats a pan that is wound in a double concentric shape and is placed on the top plate, and the heating coil is inclined with respect to the top plate that supports the heating coil and is substantially horizontal. A coil holder for keeping the temperature, a temperature sensor provided between the inner coil and the outer coil for detecting the temperature of the pan through the top plate, and supplying a high-frequency current to the heating coil and the temperature sensor pressed if the sensed temperature exceeds a predetermined temperature the coil is fastened to the coil holder for fixing a frequency conversion circuit for stopping the supply of the high frequency current, the heating coil to the coil holder When provided with, in the direction of the site in which the heating coil from the center of the heating coil is closest to the top plate, the temperature sensor is provided, the coil presser of the heating coil which is closest to the top plate It is provided at a place other than the part .

As a result, a temperature sensor can be installed at the bottom of the cooker where the temperature is highest, quickly suppressing firepower against the cooking of the cooker and preventing damage to the pan or the machine , and the coil presser abnormally Heat generation can be suppressed .

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. In addition, it is possible to provide an induction heating cooker that suppresses abnormal heating of the coil presser .

The present invention is such that a top plate provided on the upper surface of a main body, an inner coil provided below the top plate, and an outer coil outside the inner coil are wound in a double substantially concentric shape and mounted on the top plate. A heating coil that heats the placed pan, a coil holder that supports the heating coil and keeps the heating coil inclined with respect to the substantially horizontal top plate, and the inner coil and the outer coil A temperature sensor that is provided between and detects the temperature of the pan via the top plate; and when the detected temperature of the temperature sensor exceeds a predetermined temperature while supplying a high-frequency current to the heating coil, the high-frequency current comprising a frequency converter circuit for stopping the supply of, and a coil retainer which is fastened to the coil holder for fixing the heating coil to the coil holder, the heating co from the center of the heating coil In the direction of the portion Le is closest to the top plate, wherein the temperature sensor is provided, the coil retainer in Rukoto provided in a location other than the site of the heating coil which is closest to the top plate, the pot A temperature sensor can be provided in the lower part of the highest temperature position, and it is possible to quickly suppress the thermal power against empty baking of the pot and prevent damage to the pot and the fuselage.

In addition , the heating coil has a double, substantially concentric shape, and by providing a temperature sensor between the inner inner coil and the outer outer coil, the temperature sensor is more reliably provided at the lower part of the cooker where the temperature is highest. It is possible to quickly suppress the thermal power against the pan baking and prevent damage to the pan and the aircraft.

Further, the temperature sensor because of having a function as a thermal cut-out device can be more reliably providing a temperature sensor at the bottom of the hottest position of the pan, quickly fired against bakeout pot Suppressing and preventing damage to pans and aircraft.

In addition , a coil presser for fixing the heating coil to the coil holder is provided, and the coil presser is provided at a place other than the part of the heating coil that is fastened to the coil holder and close to the top plate. Abnormal heat generation can be suppressed.

Embodiments and reference embodiments of the present invention will be described below 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, thereby enabling fine control with various cooking performances. A temperature sensor 10 that detects the temperature of a 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 disposed between the inner coil 4a and the outer coil 4b. ing. The temperature sensor 10 is always urged to the top plate by a spring or the like, and is constituted by a resistance element such as a thermistor or a bimetal type thermostat. Further, the coil holder 3 is inclined with respect to the top plate 2 so that the heating coil 4 is inclined with respect to the top plate 4, and the temperature sensor 10 is located closer to the top plate 2 than the center of the inclined heating coil 4. Provided. When the coil holder 3 is substantially parallel to the top plate 2, the same effect can be obtained by inclining the heating coil 4 by inclining the installation surface of the coil holder 3 that holds the heating coil 4. Further the heating coil 4 in order to securely hold the coil holder 3, the coil presser 5 to bias the upper surface of the heating coil 4 to the coil holder 3 side provided, the coil retainer 5 is also heating coil 4 and the top plate 2 is more They are disposed in a place off the position where the near-contact.

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

First, 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 plate 2. An eddy 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 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 temperature sensor 10, and when the temperature sensor 10 exceeds a certain temperature, the supply of the high-frequency current to the heating coil 4 is complete. It has a function as an overheat prevention device that stops. Further, since the heating coil 4 is inclined with respect to the top plate 2 and further the cooking device 9, the cooking device 9 generates more eddy currents than the part where the part is away from the top plate 2 near the heating coil 4. This increases heat generation. Since the temperature sensor 10 is arranged at a position where heat generation increases, even when the cooking device 9 performs an empty baking, the heating power can be quickly suppressed and damage to the cooking device 9 or the machine body can be prevented. Further, by arranging the coil holder 5 other than the high temperature portion, it is possible to prevent the coil presser from generating heat abnormally.

( Reference form 1 )
FIG. 3 is a cross-sectional view showing the configuration of the induction heating cooker according to the first reference embodiment of the present invention.

  In FIG. 3, among the heating coils 4 supported by the coil holder 3, the inner coil 4a is arranged near the top plate 2 side in the vertical direction with respect to the outer coil 4b. Furthermore, the temperature sensor 10 is located in the middle of the inner coil 4a and the outer coil 4b or in the inner diameter portion of the inner coil 4a.

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

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 temperature sensor 10 which is arranged at a position where the inner diameter portion of which heat generation of the intermediate or inner coil 4a of the inner coil 4a and the outer coil 4b increases, quickly fired even when the cooker 9 has event conducted bakeout It can suppress and can prevent damage to a cooking appliance 9 or an airframe. Although the inner coil 4a is close to the top plate side in the present reference embodiment, the outer coil 4b is close to the top plate 2 side, it may be arranged a temperature sensor 10 in the vicinity of the outer coil 4b. Further, a part of the coil may be protruded toward the top plate 2, and the temperature sensor 10 may be disposed in the vicinity of the protrusion. In this case, the shape may not be a double-winding coil.

As described above, the induction heating cooker according to the present invention may be provided with a temperature sensor at the bottom of the hottest position of the pot, to suppress the rapidly fired against baking pan, such as pots and airframe Since it becomes possible to prevent damage, it is applicable also to uses, such as a cooker and 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 1st reference form 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 5 Coil presser 7 Frequency conversion circuit 9 Cooker 10 Temperature sensor

Claims (1)

A pan placed on the top plate, in which a top plate provided on the top surface of the main body and an inner coil provided below the top plate and an outer coil outside the inner coil are wound in a double, substantially concentric shape. A heating coil that heats the heating coil, a coil holder that supports the heating coil and keeps the heating coil inclined with respect to the substantially horizontal top plate, and is provided between the inner coil and the outer coil. A temperature sensor that detects the temperature of the pan through the top plate, and a high-frequency current is supplied to the heating coil, and the supply of the high-frequency current is stopped when a temperature detected by the temperature sensor exceeds a predetermined temperature. a frequency conversion circuit for, and a coil retainer which is fastened to the coil holder for fixing the heating coil to the coil holder, wherein the heating coil from said center of said heating coil In the direction of the site closest to the plate, the temperature sensor is provided, the coil presser induction heating cooker, characterized in that provided in a location other than the site of the heating coil which is closest to the top plate .