JP5471520B2 - Induction heating cooker - Google Patents

Description

The present invention relates to an induction heating cooker that cooks on a top plate.

Conventionally, in this type of induction heating cooker, a capacitive electrode is provided on a top plate in a circle or a substantially rectangular shape around a heating means for an object to be heated.

JP-A-61-243690

However, since the conventional configuration is an electrode configuration arranged on the outer periphery of the heating means on the top plate, in an induction heating cooker equipped with two or more heating means, a plurality of electrodes are arranged due to space problems. It was difficult to cope with spilling of large pots.

The present invention is intended to solve the conventional problems, the degree of freedom in arrangement of the heating means to increase the degree of freedom in the arrangement of the electrodes in the periphery of the heating means can be improved, also detects Re Fukikobo large pot It is an object of the present invention to provide an induction heating cooker that can improve safety and can reduce costs by reducing wiring.

In order to solve the conventional problems, an induction heating cooker according to the present invention includes a top plate on which an object to be heated is placed, a main body provided below the top plate, and the food provided below the top plate. first and second heating means for heating the heating object, and a control unit for controlling the heating output of the first heating means and the second heating means, said first heating means of the top plate lower surface and said second heating left and right in the first heating means and the second heating means around the means
Including the first and second electrode portions substantially arcuate provided two or more on the front side and the rear side at intervals, the oscillating unit for applying an alternating signal to said first and second electrode parts wherein the contact between the electrostatic capacitance detecting means for detecting the increase in capacitance of the first and second electrode parts, the first and second connecting terminals connected to the capacitance sensing means while conducting said first and second electrode parts provided on the top plate lower surface connected to the first connecting terminal and said second connecting terminal, from the first heating means and the second heating means first and second electrode connecting portion is also provided on the front, the first and second electrode parts and the first electrode portion and the connecting the first electrode connecting portion and the second electrode connecting portions first and second electrodes communication unit thinner than the second electrode portion, wherein the first Together with the first electrode communicating unit and the second electrode communicating portion is arranged substantially parallel to between said heating means a second heating means, wherein the first heating means first electrode portion and the first electrode It is configured to be arranged with a certain distance between the communication unit and between the second heating means and the second electrode unit and the second electrode communication unit .

As a result, when the pan is placed above the first and second electrode communication units by heating the large pan or by shifting the pan during heating, the increase in capacitance can be reduced. The ability to prevent detection, increase the degree of freedom of electrode arrangement around the heating means, improve the degree of freedom of arrangement of the heating means, detect the spilling of large pots, increase safety, and reduce wiring Can reduce costs. In addition, the heating means is an induction heating coil, and when the distance between the electrode unit and the heating means is short in order to generate an alternating magnetic field, capacitance noise is generated due to the alternating magnetic field, so that a certain distance or more is secured. it is possible to prevent an erroneous operation, that provides an induction heating cooker.

The present invention can increase the degree of freedom of arrangement of the electrodes around the heating means and improve the degree of freedom of arrangement of the heating means, and can increase the safety by detecting the spilling of a large pan, and by reducing the wiring Cost can be reduced. In addition, the heating means is an induction heating coil, and when the distance between the electrode unit and the heating means is short in order to generate an alternating magnetic field, capacitance noise is generated due to the alternating magnetic field, so that a certain distance or more is secured. It is possible to provide an induction heating cooker that can prevent malfunction .

Overall configuration schematic diagram of induction heating cooker in Embodiment 1 of the present invention Front view of top surface of top plate of induction heating cooker in embodiment 1 of the present invention The block diagram which shows the cross section of the induction heating cooking appliance in Embodiment 1 of this invention. Overall perspective view of induction heating cooker in a conventional example

A first invention is a top plate for placing an object to be heated, a main body provided below the top plate, and an induction heating coil for induction heating the object to be heated provided below the top plate with an alternating magnetic field. a certain first and second heating means, and a controller for controlling the heating output of the first heating means and the second heating means, the periphery of the top plate lower surface of the first heating means and the second heating means first and second electrode portions substantially arcuate provided 2 respectively to one or more front and rear side at an interval in the left and right in the first heating means and the second heating means, said AC signal first and capacitance detection means for detecting the increase in capacitance of the first and second electrode parts comprises an oscillation unit for applying to the electrode part and the second electrode portion, the capacitance sensing means With the connected first and second connection terminals While conducting said first and second electrode parts provided on the top plate lower surface first connection is connected to the terminal and the second connecting terminal by touch, the first heating means and the second first and second electrode connecting portion provided in front of the heating means, the first electrode portion and the first electrode for connecting the first electrode connecting portion and the second electrode portion and the second electrode connecting portions parts and and a thin first and second electrodes communication portion than the second electrode portion, the first electrode communicating unit and the second electrode communicating portion between the first heating means and the second heating means Are arranged substantially in parallel, and between the first heating means and the first electrode part and the first electrode communication part, and between the second heating means and the second electrode part and the second electrode communication part. to become disposed apart a predetermined distance or more between the Thus, when the pan is placed above the first and second electrode communication units by heating the large pan or by shifting the pan during heating, the increase in the capacitance can be reduced. The ability to prevent detection, increase the degree of freedom of electrode arrangement around the heating means, improve the degree of freedom of arrangement of the heating means, detect the spilling of large pots, increase safety, and reduce wiring Can reduce costs. In addition, the heating means is an induction heating coil, and when the distance between the electrode unit and the heating means is short in order to generate an alternating magnetic field, capacitance noise is generated due to the alternating magnetic field, so that a certain distance or more is secured. Malfunctions can be prevented.

A second invention is, in particular, in the first invention, the first said top plate of said first said capacitive detection means determines that the liquid is boiling over the opposite portion to the electrode portion during the heating by the heating means wherein in as predetermined increase amount of the capacitance detected becomes greater than the amount of increase of the electrostatic capacity when liquid boiling over the entire portion facing the first electrode connecting portion on the top plate first By determining the areas of the one electrode connection part and the second electrode connection part, the detection sensitivity of the spillage above the electrode connection part can be suppressed, and erroneous detection can be prevented.

A third invention is, in particular, in the first or second aspect, the display board connected to the control unit with is provided in front of the first heating means and the second heating means of the top plate downward, the display board upwards and a display unit showing the heating power or heating condition of the first heating means and second heating means provided in the top plate, the first on the display board connecting terminal and the second By providing the connection terminal, it is possible to secure a space around the first and second heating means and to reduce costs by reducing wiring.

A fourth invention is, in particular, in the first or second aspect, an operation board connected to the control unit with is provided in front of the first heating means and the second heating means of the top plate downward, An operation unit having a heating output adjustment button or a heating start button for adjusting the heating output of the first heating means and the second heating means provided on the top plate above the operation board, and the operation board by providing the first connecting terminal and said second connecting terminal, the cost can be suppressed by reducing the wiring and ensure the space around the first and second heating means.

(Embodiment 1)
Figure 1 is an overall schematic diagram of the structure of the induction heating cooker in the first embodiment of the present invention, FIG. 2 is a front view of the top plate top surface of the induction heating cooker in the first embodiment of the present invention. FIG. 3 is a block diagram showing a cross section of the induction heating cooker according to Embodiment 1 of the present invention.

In FIG. 1, a heated object 16 such as a pot containing water is placed on a translucent top plate 1 and heated by a first heating means 3 and a second heating means 4 disposed below the top plate 1. . Note that the top plate has a high heat resistant temperature and is preferably an insulating material. A main body 2 that holds the entire internal organs is provided below the top plate 1. The first heating unit 3 and the second heating unit 4 are connected to a control unit 5 that controls the heating output, and the control unit 5 is disposed below the first heating unit 3 and the second heating unit 4. In front of the first heating means 3 and the second heating means 4 below the top plate 1, a display board 17 connected to a control board indicating a heating output or a heating state is arranged, and an LED arranged on the display board 17. The display can be visually recognized on the display unit 19 above the top plate 1 by light emission from an LCD or the like. Further, the display substrate 17 of the present embodiment is provided with a capacitance detection means, and is provided with an operation terminal 21 made of electrostatic rubber, so that a heating output adjustment button or heating of the operation unit 20 above the top plate 1 is provided. When the user touches the start button, the heating start or heating output of the first heating means 3 and the second heating means 4 can be adjusted. The operation terminal 21 may be made of metal.

  The main body 2 constituting the outer shell is connected to the ground via a power cord (not shown).

  In FIG. 2, substantially arc-shaped first and second electrode portions 6 and 7 provided at least around the first heating means 3 and the second heating means 4 disposed on the lower surface of the top plate 1 are formed of carbon. Is arranged by printing. Needless to say, the first electrode portion 6 and the second electrode portion 7 may be arranged by attaching a thin copper plate, or the capacitance can be easily detected if it is a conductor. The first electrode means 6 and the second electrode part 7, which are communication lines of the first electrode part 6 and the second electrode part 7, are narrower than the first electrode communication part 14 and the second electrode communication part 15. And connected to the first electrode connecting portion 12 and the second electrode connecting portion 13 provided in front of the second heating means 4. The first electrode connection portion 12 and the second electrode connection portion 13 are connected to the capacitance detection means 8 by contact between the first connection terminal 10 and the second connection terminal 11 of FIG. Further, the electrostatic capacitance detection means 8 of the present embodiment also serves as the display substrate 17 and the operation substrate 18. Further, by arranging the first electrode communication unit 14 and the second electrode communication unit 15 substantially in parallel, a space is secured, and the first electrode unit 6 and the second electrode unit 7, the first heating means 3 and the second heating unit are secured. The degree of freedom of arrangement of the means 4 can be improved, and a cost reduction effect due to a reduction in wiring can be expected. Further, when the number of heating means is increased, there is a high possibility that the distance between the heating means will be narrowed, and the first electrode communication unit 14 and the second electrode communication unit 15 are arranged substantially in parallel so that there is a relatively large space. It becomes possible to arrange the first electrode connection portion 12 and the second electrode connection portion 13 in front of the first heating means 3 and the second heating means 4.

  In FIG. 3, when the liquid 22 spills on the top plate 1 around the object to be heated 16, the first electrode unit 6 or the second electrode unit 7 is connected to the first electrode communication unit 14 or the second electrode communication unit 15. The first electrode connection portion 12 or the second electrode connection portion 13 is connected to the capacitance detecting means 8 via the first connection terminal 10 or the second connection terminal 11 and is heated by the adhesion of the liquid 22. By detecting an increase in the capacitance between the object 16 and the object 16, it is possible to determine whether the spillage has occurred. A signal is transmitted to the control unit 5 connected to the capacitance detection means 8 when the capacitance detection means 8 determines that the spillage has occurred. The control unit 5 performs control to stop the spilling of the liquid 22 by reducing or setting the heating output of the first heating unit 3 or the second heating unit 4 to zero. In addition, since the capacitance detection means 8 of the present embodiment also serves as the display substrate 17 and the operation substrate 18, the heating output and heating of the first heating means 3 or the second heating means 4 in the control unit 5 are provided. The heating output and the heating state can be displayed on the display unit 19 which transmits the state and emits light from the LED or LCD disposed on the display substrate 17 and is also received by the top plate 1. Further, when the user touches the heating output adjustment button or the heating start button of the operation unit 20, the operation board 18 detects an increase in capacitance and transmits a heating output adjustment or heating start signal to the control unit 5. To do. The controller 5 adjusts the heating output of the first heating means 3 or the second heating means 4 or starts heating.

The operation and action of the induction heating cooker configured as described above will be described.

When the user touches the heating output adjustment button or the heating start button of the operation unit 20, the operation substrate 18 detects an increase in capacitance and transmits a heating start signal to the control unit 5. The controller 5 starts heating the article to be heated 16 by the first heating means 3. The object to be heated 16 is a pan containing a liquid 22 such as water. The liquid level rises due to temperature rise or evaporation due to heating, or bubbles are generated, so that the liquid 22 spills outside the object to be heated 16. Then, it travels along the outer surface of the object to be heated 16 and falls to the outer periphery of the object to be heated 16 on the top plate 1. Since the capacitance up to the capacitance detection means 8 that is in conduction with the first electrode portion 6 due to the adhesion of the liquid 22 increases, the capacitance detection means 8 detects and determines the spillage. First heating means 3
Or the control which stops the spilling of the liquid 22 is performed by reducing the heating output of the 2nd heating means 4 to 0. When the heating cooker of the present invention is an induction heating cooker, the first heating means 3 is an induction heating coil, and the distance between the first electrode unit 6 and the first heating means 3 is set to generate an alternating magnetic field. If the distance is near, capacitance noise due to an alternating magnetic field is generated, so that a certain distance or more can be secured to prevent malfunction. For this reason, it is difficult to arrange the first electrode part 6 and the second electrode part 7 at a short distance from the induction heating coil. In this example, since the first electrode communication unit 14 and the second electrode communication unit 15 are arranged substantially in parallel, the degree of freedom in arrangement of the arc-shaped first electrode unit 6 and second electrode unit 7 is increased. It is possible to ensure a distance from the first heating means 3 (induction heating coil), and the diameter of the object to be heated 16 is large above the first electrode communication unit 14 and the second electrode communication unit 15 on the top plate. Even when placed due to a pan slip, etc., the sensitivity of the increase in capacitance is dull because the width of the electrode is narrowed, and misdetection is difficult.

As described above, the induction heating cooker according to the present invention can increase the degree of freedom of arrangement of the electrodes around the heating means and improve the degree of freedom of arrangement of the heating means. Since the cost can be reduced by reducing the number of wires, the present invention can be applied to uses such as a home or business induction heating cooker in which a pan is placed on a top plate for cooking.

DESCRIPTION OF SYMBOLS 1 Top plate 2 Main body 3 1st heating means 4 2nd heating means 5 Control part
6 First electrode section
7 Second electrode part 8 Capacitance detection means 10 First connection terminal 11 Second connection terminal 12 First electrode connection part 13 Second electrode connection part 14 First electrode communication part 15 Second electrode communication part 16 Heated object 17 Display board 18 Operation board 19 Display section 20 Operation section 21 Operation terminal 22 Liquid 23 Electrode

Claims (4)

A top plate for placing an object to be heated, a main body provided below the top plate, and first and second induction heating coils for induction heating the object to be heated provided below the top plate with an alternating magnetic field . and heating means, and a controller for controlling the heating output of the first heating means and the second heating means, said first heating means around the top plate lower surface of the first heating means and the second heating means and front and rear side two or more and the first and second electrode portions substantially arcuate provided, the first electrode portion and the second electrode an AC signal at an interval in the left and right respectively in the second heating means and capacitance detection means for detecting the increase in capacitance of the first and second electrode parts comprises an oscillating unit to be applied to the parts, first and connected to the capacitance sensing means 2 contact with the connection terminal While conducting said first and second electrode parts provided on the top plate lower surface which is connected to the connection terminal and the second connecting terminal, forward of the first heating means and the second heating means the provided first and the second electrode connecting portions, said first and second electrode parts and the first electrode connecting portion and the first electrode portion and the second connecting said second electrode connecting portions and a thin first and second electrodes communication unit than the electrode portions, arranged substantially parallel to the first electrode communicating unit and the second electrode communicating portion between the first heating means and the second heating means And constant between the first heating unit and the first electrode unit and the first electrode communication unit, and between the second heating unit and the second electrode unit and the second electrode communication unit. induction, characterized in that formed by spaced apart over a distance Heat cooker. Wherein a predetermined amount of increase in the capacitance detected by the first heating means in the electrostatic capacitance detection means determines that the liquid is boiling over in a portion facing the first electrode portions on the top plate during heating increase the area of the first electrode connecting portion and the second electrode connecting portion is determined as larger than the electrostatic capacity when boiling over a liquid throughout a portion facing the first electrode connecting portion on the top plate The induction heating cooker according to claim 1, wherein the induction heating cooker is used. A display board connected to the control unit with is provided in front of the first heating means and the second heating means of the top plate downward, the display substrate upward in the first heating means provided in the top plate and and a display unit showing the heating power or heating condition of the second heating means, to claim 1 or 2, characterized in that a first connecting terminal and said second connecting terminal on the display substrate The induction heating cooker described. An operation board connected to the control unit with is provided in front of the first heating means and the second heating means of the top plate downward, the first heating means provided in the top plate by the operation above the substrate and and the operating unit having a heating output adjustment button or heating start button for adjusting the heating power of the second heating means comprises, in that a first connecting terminal and said second connecting terminal to said operation panel The induction heating cooker according to claim 1 or 2, characterized by the above.

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