JPS59146185A - Induction heating cooking device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention (l''!) relates to an induction heating cooker that directly heats the bottom of a pot with Joule heat caused by eddy currents generated by electromagnetic induction.

Conventional configuration and its problems 2Based: Previously, induction heating cookers that applied induction heating heated the bottom of the metal pot directly, unlike electric heaters or gas heaters.
'U, there are essentially no red-hot parts or high-temperature parts, and it has many features such as high efficiency, safety, and cleanliness. On the other hand, in order to generate an alternating magnetic field with ultra-audible frequencies, a power conversion device is required, and it must be stored inside the aircraft insulated from the outside, but it is not used during actual use, such as turning the power on/off and setting the output. The problem was the insulated and waterproof structure of the control section that accepts requests from users. In particular, for built-in cookers that are embedded in tables or counters, it is desirable to have the heating surface of the pot and the operating surface on the same plane, and to integrate the whole unit as a unit, in order to eliminate the complexity of installation. ,
It is necessary that the operation function is not lost due to cooking food, water droplets, and steam from the pot, and the insulation from the inside is not lost.

For example, in touch controls that utilize capacitance between electrodes on the front and back surfaces of glass, there is complete insulation from the inside, but
If there is boiling over on the operation surface, multiple electrodes become electrically conductive, making it impossible to determine which electrode has a signal, resulting in a loss of operability. In addition, the electrode (generally a tin oxide film) formed on the glass surface may be scraped or cut due to friction from cooking accessories such as knives or the bottom of the pot, resulting in a significant decrease in sensitivity. Alternatively, if the unit has multiple heating parts, the operating part will naturally have to be larger, but glass in general, and tempered glass in particular, has poor dimensional accuracy, which is an obstacle to making the entire unit into a unit. was.

As another conventional example, as shown in FIG. 1, a non-magnetic metal plate 1 is used to ensure insulation from the inside, and a magnetic sensor, such as a reed switch or a Hall element 2, is placed on the bottom surface of the metal plate 1.
There is something. This is a special magnet 3 on the soil surface of the metal plate 1.
When placed, the internal magnetic sensor activates and issues an operation signal.

This makes it easy to seal between the metal plate 1 and the metal frame 1, so there are no problems with insulation from the inside or scratches from the bottom of the pot, etc., but the magnet for operation always needs to be turned on. Therefore, if you lose it, you may not be able to use it.

Even if it is set to ``t''L, the user is required to be extremely careful when handling it, and it is necessary to improve the usability.

OBJECT OF THE INVENTION The present invention provides an induction heating cooker that is easy to use and eliminates the disadvantages of such usage. a heating coil disposed below the heating coil, and a static electric power converter that supplies an alternating current at an ultra-audible frequency to the heating coil; In addition, an input setting panel made of a membrane type thin film switch is arranged, and an operation plate made of a thin metal plate is attached to the upper surface of the input setting panel.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

5, - ・ FIG. 2 shows a state in which the unit part 't is fitted into the counter 6. In order to support the unit on the same plane as the counter 6, the metal exterior 4 forming the cooker is exposed to the surroundings. Inside the exterior 4, there is a heat-resistant and electrically insulating pot mounting plate 5 with two heating parts, and a thin metal operation plate γ having a display indicating an input setting switch, which are on the same plane. is fixed.

A detailed internal description is shown in FIG. The operation plate 7 is made of a thin metal plate such as a stainless steel plate or an aluminum sheet, has sufficient strength against scratches, etc., is pressed against the metal exterior 4, and has sufficient electrical and thermal properties. It is connected.

Below the operation panel 7, a pair of electrically insulating plates 8a and 8b are opposed to each other in a sandwich structure with an insulating spacer 1o in between. Electrodes 9a, 9b, 11a, 11 on the opposing surfaces
b is formed. The above-mentioned parts constitute an input setting panel 12 consisting of a membrane type thin film switch. This input setting panel 12 is arranged adjacent to the pot mounting plate 6. These electrodes 9a, 9b, 11a
, 11b may be arranged and formed as necessary, such as turning on/off the power and setting the output necessary for setting the induction heating cooker. Also, insulating plates 8a, 8b and electrodes 9a, 9b.

11a and 11b can be easily constructed by using a flexible printed circuit board made of polyester or polyimide base material with copper foil adhered to it, but a good conductor is formed on a part of the surface of an insulating board that has some elasticity. There is no particular limitation as long as it is. Alternatively, a pair of insulating plates 8a and 8b can be formed by bending a single flexible printed circuit board.
Further, a support plate 13 having sufficient mechanical strength is in contact with the lower surface of the insulating plate 8b located below, and this plate is fixed to the exterior 4i/il by an L-shaped angle 4'.

Among these configurations, those that do not use a metal working board are:
As a membrane-type thin film switch, it can be used on geeboards, etc.
Although it has been put into practical use, the use of a metal operating plate can provide great effects as described below.

The effect of this configuration is that the electrode (
In the case of FIG. 3, the terminals 11a and 11b) are in contact with each other and conductive (~, giving a signal to the static 11 - power converter 14 in the same exterior 4. Accordingly, the crystallized glass such as ceramic An alternating current with an ultra-audible frequency is supplied to a heating coil 15 disposed below a pot mounting plate 5 such as the above.

In addition, since induction heating cookers do not have flames or red-hot parts, you cannot tell whether they are working or not, or whether they are set. It is essential to have a display means to inform the user of the output level etc.

In FIG. 3, a light indicator 16 using a light emitting diode (LED) is placed near the electrode. Since the operation plate is made of metal, a display window is cut out and a glass piece 17 is placed underneath for waterproofness and light guidance.

Further, since the membrane type thin film switch is thin, four parts are provided on the support &13 to fix and support the glass piece 1γ. The optical display 16 is displayed through windows 18 formed in four parts of the support plate 12.

2. Although the built-in induction heating cooker has been described as shown in FIG. 2, the content of the present invention is not limited thereto. Even with conventional stove-top type devices that are placed on a table, the operating section could not be placed on the same plane as the pot placement surface to ensure waterproofness and mechanical strength, so the configuration of the present invention was applied. This will give you extremely good operability and display.

Effects of the Invention As described above, the induction heating cooker of the present invention has the following excellent effects.

■ Since the switch part is covered with a metal operation panel, it has high mechanical strength and is safe even if it is hit with sharp cooking utensils or the bottom of a pot without causing any cracks.

■ High dimensional accuracy as no tempered glass is required.

In particular, when there are two or more heating parts, the operation panel also needs to be enlarged, but it can easily accommodate large panels.

■ If the operation panel and the exterior are in contact as in the example, static electricity from the human body will be discharged by 9S through the exterior and static electricity will not infiltrate into the interior, so static electricity from the human body will not pass through the fingertips like a touch panel. It is safe as there is no possibility of electrical discharge inside the aircraft and destruction of internal elements.

■ Even if a high-temperature object such as an empty pot is accidentally placed on the operation panel, if the exterior and operation panel are in contact as in the example, the heat will be dissipated through the operation panel, so it will not be possible to avoid electrodes or other objects with low heat resistance. Heat stress is less likely to be applied to the light emitting diode.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of a conventional induction heating cooker, Fig. 2 is a partial perspective view of an induction heating cooker according to an embodiment of the present invention, and Fig. 3 is a sectional view of a main part of the induction heating cooker. It is a diagram. 4. Exterior, 6. Pot mounting plate, 7. Metal operation plate, s a, s b - Insulating plate, 9a, 9b,
11a. 11b--Electrode, 14-Static power converter, 15-Heating coil. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (2)

[Claims] (1) It has a pot mounting plate having heat resistance and electrical insulation, a heating coil disposed below the plate, and a static power converter that supplies an alternating current at an ultra-audible frequency to the heating coil, and the above-mentioned An induction heating cooker in which an input setting panel made of a membrane-type thin film switch is arranged adjacent to a pot mounting plate, and an operation plate made of a thin metal plate is attached in contact with the top surface of the input setting panel. (2) The induction heating cooker according to claim 1, wherein the operation plate is in contact with a metal frame constituting the exterior of the cooker.