JP2002100466A - Temperature-detecting part of electromagnetic cooking appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temperature-detecting part, suitable for measuring the heating temperature of a pan of an electromagnetic cooking appliance. SOLUTION: This temperature detecting part has a temperature sensor element 41 for measuring the heating temperature of the pan, a sensor holder 42 for holding this temperature sensor element 41, a coil spring 43 for pushing this sensor holder 42 against an under surface of a top plate 11, in a central part of a work coil 12 and a copper ring 44 for bringing about shielding effects, such as magnetic flux from the work coil 12 which acts so as to prevent influence on a lead wire 41a of the temperature sensor element 41 and the coil spring 43.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to induction heating of a pan placed on the top plate by supplying high-frequency power to a spiral work coil installed close to the bottom surface of the top plate. The present invention relates to an electromagnetic cooker, and more particularly to a temperature detector of the electromagnetic cooker for measuring a heating temperature of the pan.

[0002]

2. Description of the Related Art In a conventional electromagnetic cooker of this kind,
In order to measure the heating temperature of the pot placed on the upper surface of the top plate, a glass-sealed thermistor is installed at the center of the spiral work coil and in contact with the lower surface of the top plate.

The lead wire of the thermistor is generally made of a dumet wire (dum) in order to maintain the airtightness with the glass.
However, since this dumet wire is a magnetic metal conductor as is well known, it is affected by the magnetic flux generated from the work coil, and an error occurs in the measured value of the heating temperature of the pan. Sometimes occurred.

Conventionally, in order to reduce the above error, the center diameter of the spiral work coil is increased as much as possible,
It has been practiced to dilute the magnetic flux near the lead wire.

[0005]

However, as described above, when the center diameter of the spiral work coil is increased, the distribution state of the magnetic flux generated from the work coil for inductively heating the pan changes, and as a result, There is a risk that the heating efficiency of this electromagnetic cooker will decrease.

An object of the present invention is to provide a temperature detector of an electromagnetic cooker for more accurately measuring the heating temperature of a pot without impairing the heating efficiency of the electromagnetic cooker.

[0007]

According to the first aspect of the present invention, a high-frequency power is supplied to a spiral work coil installed close to the lower surface of the top plate, so that the coil is placed on the upper surface of the top plate. In an electromagnetic cooker for inductively heating a pan, a temperature sensor element installed at the center of the work coil so as to be in contact with the lower surface of the top plate, and a non-magnetic element installed at a side surface around the temperature sensor element And a temperature detector of an electromagnetic cooker comprising:

According to a second aspect of the present invention, in the electromagnetic cooker, a temperature sensor element for measuring a heating temperature of the pan, a sensor holder for holding the temperature sensor element, and the sensor holder At the center of the work coil,
A coil spring for pressing against the lower surface of the top plate, and a non-magnetic conductor provided on a side surface around the coil spring and the temperature sensor element. I do.

According to a third aspect of the present invention, in the temperature detector of the electromagnetic cooker according to the second aspect, the nonmagnetic conductor is formed of a hollow copper ring.

According to a fourth aspect of the present invention, in the temperature detection section of the electromagnetic cooker according to the third aspect of the present invention, the height of the copper ring and the compressed coil spring when the sensor holder is pressed against the lower surface of the top plate. And the height is almost the same.

According to the present invention, the non-magnetic conductor provided on the side surface around the temperature sensor element can act as a magnetic shield for the magnetic flux from the work coil. An error in the measured value of the heating temperature of the pan can be reduced.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic sectional view of an electromagnetic cooker showing an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes an electromagnetic cooker, and 2 denotes a pan which is induction-heated by the electromagnetic cooker 1.
Is a top plate 11 formed of ceramic or the like,
A work coil 12 wound in a spiral shape, the center of which is blank in a circle; a coil base 13 supporting the work coil 12; a temperature detector 14 for measuring the heating temperature of the pan 2; And a high frequency power supply 14 for supplying high frequency power to the coil 12. Here, the temperature detector 14 is attached so as to be in contact with the lower surface (inner surface) of the top plate 11.

FIG. 2 shows an embodiment of the temperature detecting section of the electromagnetic cooking device according to the present invention. FIG. 2 is a schematic detailed sectional view showing an example of the configuration of the temperature detecting section 11 shown in FIG. The same components as those shown in FIG.

In FIG. 2, a plurality of strip-shaped or fan-shaped ferrites 13a are radially arranged on a coil base 13, and the ferrite 13a, the work coil 12, and the iron pot 2 form a magnetic circuit. 2 is induction heated by the high frequency magnetic flux of this magnetic circuit.

Accordingly, in order to detect the heating temperature of the pan 2 via the top plate 11, the temperature detecting section 11 includes a temperature sensor element 41 such as a glass-sealed thermistor and a sensor for holding the temperature sensor element 41. Holder 42, installed between sensor holder 42 and coil base 13,
A coil spring 43 for bringing the temperature sensor element 41 into contact with the lower surface (inner surface) of the top plate 11 via the sensor holder 42 and a magnetic flux from the magnetic circuit, such as a dumet wire of the temperature sensor element 41, are used. Lead wire 41
a and a copper coil 44 serving as a magnetic shield for preventing linkage with the magnetic coil spring 43.

The height of the copper ring 44 is substantially the same as the height of the coil spring 43 which is compressed when the sensor holder 42 is pressed against the lower surface of the top plate 11, so that the magnetic force for the lead wire 41a is reduced. The effect of the shield is also achieved.

The fall prevention leg 42 of the sensor holder 42
a is formed for the purpose of preventing the coil spring 43 from dropping off from the coil base 13 when the top plate 11 is removed, as shown in FIG. Formed into a shape
It is integrally molded or fixed.

[0019]

According to the present invention, a non-magnetic conductor, for example, a hollow copper ring provided on the side surface around the temperature sensor element has a magnetic shielding function against magnetic flux from the work coil. As a result, the error of the measured value of the heating temperature of the pan can be reduced. Therefore, the inside diameter of the center of the work coil may be small, and the effect on the heating efficiency of the electromagnetic cooker is small.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of an electromagnetic cooker according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of a temperature detector of an electromagnetic cooker according to an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electromagnetic cooker, 2 ... Pot, 11 ... Top plate, 12
... Work coil, 13 ... Coil base, 14 ... Temperature detector, 15 ... High frequency power supply, 41 ... Temperature sensor element, 42 ...
Sensor holder, 43: coil spring, 44: copper ring.

Claims (4)

[Claims] 1. An electromagnetic cooker for inductively heating a pan placed on an upper surface of a top plate by supplying high-frequency power to a spiral work coil installed close to a lower surface of the top plate, At the center of the work coil, a temperature sensor element is provided so as to be in contact with the lower surface of the top plate, and a non-magnetic conductor is provided on a side surface around the temperature sensor element. Temperature detector of electromagnetic cooker. 2. An electromagnetic cooker for inductively heating a pan placed on an upper surface of a top plate by supplying high-frequency power to a spiral work coil installed close to a lower surface of the top plate, A temperature sensor element for measuring the heating temperature of the pan; a sensor holder for holding the temperature sensor element; and a sensor holder for pressing the sensor holder against the lower surface of the top plate at the center of the work coil. And a non-magnetic conductor disposed on a side surface around the coil spring and the temperature sensor element. 3. The temperature detection unit of an electromagnetic cooker according to claim 2, wherein the nonmagnetic conductor is formed of a hollow copper ring. 4. The temperature detecting section of the electromagnetic cooker according to claim 3, wherein a height of the copper ring and a height of a compressed coil spring when the sensor holder is pressed against a lower surface of the top plate. The temperature detecting section of the electromagnetic cooker, wherein the temperature is substantially the same.