JPS5951295B2 - heating cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating cooker in which the power supplied to a heating element is controlled by detecting the temperature of a container, and in particular, an object of the present invention is to accurately control the temperature of food to be cooked.

In general, in cooking appliances in which the container and the heating section are separable, the temperature of the food to be cooked is controlled by bringing a temperature sensing element into contact with the bottom of the container to sense the temperature at the bottom of the container. It is being

However, in this heating cooker, the temperature sensing element was only in contact with the bottom of the container, and the temperature of the food could not be accurately controlled.

The present invention eliminates the drawbacks of the conventional heating cooker and achieves the intended purpose by detecting the opening and closing of a temperature-sensitive switch provided at the bottom of the container using electromagnetic induction and controlling the power supplied to the heating element. A deep fryer according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

In the figure, 1 is a pot, and the center of the bottom protrudes upward.

A temperature-sensitive switch 2 is installed in this protrusion, and a temperature-sensitive switch 2 is installed inside this protrusion.
A support 3 for fixing the pot to the pot 1 and a first winding 4 are provided.

The support 3 protrudes upward, and a first winding is wound around the protrusion of the support 3 and connected to the temperature-sensitive switch 2.

These pot 1, temperature sensitive switch 2, support 3, first winding 4
This constitutes the container part.

5 is a heating element, and 6 is a sensing portion made of heat-resistant resin that protrudes upward.

Reference numeral 7 denotes a ferrite core provided within the protrusion of the sensing section 6, around which a second winding 8 is wound and supported by a presser plate 9.

Reference numeral 10 denotes a power control device, which includes a high-frequency oscillation circuit section 11 that constitutes a high-frequency oscillation circuit together with a second winding 8, and a transformer relay 12 that detects a change in the oscillation frequency of this high-frequency oscillation circuit. 12, the power supply to the heating element 5 is interrupted.

13 is a power cord, 14 is a bottom plate, and 15 is a rubber leg.

These heating element 5, sensing part 6, core 7, second
The winding 8, the press plate 9, the power control device 10, etc. constitute a heating section.

16 is oil in the pot 1.

Note that the container section is removably placed on the heating section.

In the above configuration, when the power cord 13 is connected to a power source, the high frequency oscillation circuit section 11 is activated.

At this time, the temperature of the oil 16 is low, so the temperature-sensitive switch 2 is turned on.
The inductance of the first winding 4 and the inductance of the second winding 8 are combined, and the frequency determined by this combined inductance (approximately 1.7 MHz
), the high frequency oscillation circuit oscillates.

While oscillation continues at this oscillation frequency, the high frequency oscillation circuit section 11
A signal is given to the transformer relay 12, which closes its contacts and supplies power to the heating element 5.

When power is supplied to the heating element 5, the temperature of the oil 16 rises, and when the temperature of the oil reaches, for example, 180° C., the temperature-sensitive switch 2 is turned off.

Therefore, the inductance of the first winding 4 disappears,
The high frequency oscillation circuit section 11 oscillates only by the inductance of the second winding 8, and the oscillation frequency at this time deviates from 1.7 MHz.

Therefore, the output of the high frequency oscillation circuit section 11 becomes zero, the contacts of the transformer relay 12 are opened, and the power supply to the heating element 5 is cut off.

Thereafter, when the temperature of the oil 16 decreases, the temperature-sensitive switch 2 is turned on again, and the above-described operation is repeated.

Although this embodiment has been described with respect to a deep fryer, it can also be applied to other cooking appliances, such as a stew pot.

As is clear from the above description, according to the present invention, since the temperature-sensitive switch is provided at the bottom of the container, the temperature of the container can be accurately detected, and highly accurate temperature control can be performed. It is safe because it is completely insulated from the electric circuit of the heating element, etc., and the container can be separated from the heating part of the heating element, making it easy to wash the container and put food in it. It's easy to use.

[Brief explanation of the drawing]

The figure is a sectional view of a deep fryer showing an embodiment of the present invention. 1...Pot, 2...Temperature switch, 4.
...First winding, 5...Heating element, 8...
...Second winding, 10...Power control device.

Claims (1)

[Claims] 1. A container portion is formed by a pot, a temperature-sensitive switch provided at the bottom of the pot, and a first winding that is opened and closed by the temperature-sensitive switch, and a heating element provided at the top and the temperature-sensitive switch. A heating section is formed by a second winding that detects the opening and closing of the heating element by electromagnetic induction, and a power control device that controls power supplied to the heating element based on a signal from the second winding. A heating cooker on which a container part is removably placed. 2. A patent characterized in that the power control device constitutes a high-frequency oscillation circuit together with the second winding, and controls the power supplied to the heating element by detecting a change in the oscillation frequency of the high-frequency oscillation circuit or the presence or absence of oscillation. A heating cooker according to claim 1.