JPH0637840Y2 - Electromagnetic induction heating type ironing device - Google Patents

Description

[Detailed Description of the Invention] <Industrial field of application> The present invention relates to an ironing device using an electromagnetic induction heating method, and particularly for controlling the temperature of the iron surface of the iron body and safety control during ironing work. It is related.

<Prior Art> The prior art corresponding to claims 1 and 2 of the present invention is as follows.

2. Description of the Related Art In recent years, induction heating type cordless irons have been devised in which a heating coil is installed on the ironing board side and the iron surface of an iron body is heated by electromagnetic induction.

The characteristic of this ironing device is that it can be used without a cord. In order to control the temperature of the iron surface of the iron body, the conventional ironing device (see Japanese Patent Laid-Open No. 53-48243) uses a wireless communication such as a wireless iron. The temperature information of the surface was sent to the ironing board side.

In this case, a thermistor for detecting the iron surface temperature is provided on the iron body side to convert the temperature information into a voltage value, which is input to the comparator and compared with the set temperature in the comparator. When the iron surface temperature is low, an ON signal (ON signal for driving the heating coil on the ironing board side) is transmitted by the transmitting circuit. On the ironing board side, this signal is received by the receiving antenna and receiving circuit, and heating is performed. Turn on the coil drive circuit,
An electric current was passed through the heating coil to generate an alternating magnetic field, and the iron surface was induction-heated.

Further, since the iron body is cordless, an independent DC power source such as a battery is required to operate the above electronic circuit.

In addition, although there have been several proposals for a cordless iron to which electromagnetic induction is applied, nothing is said about the means for detecting the temperature of the iron surface. (See JP-A-57-190600 and JP-A-61-179193) Next, the prior art corresponding to claim 3 of the present invention is as follows.

In the conventional electromagnetic induction heating type ironing device, when the iron is left unused on the ironing board, the set temperature is maintained, and therefore clothes and the ironing board hanging surface may be scraped. In order to prevent this, conventionally, the heating is stopped if the iron body is kept stationary.

Further, in the case of the electromagnetic induction heating type, if there is a magnetic load other than the iron body on the ironing board, the iron body may be heated similarly to the iron body, and it is necessary to prevent this as well.

Conventionally, the input current of the electromagnetic induction heating device on the ironing board side is detected and the size of the load is distinguished to heat only the target load. This utilizes the fact that the heating output W differs depending on the magnitude of the magnetic material load on the ironing board, and if the heating efficiency η and the input voltage V are constant, the heating output W
And the input current A is W = η × V × A, which is in a proportional relationship. Therefore, by detecting the input current, it is possible to determine the magnitude of the load.

<Problems to be Solved by the Invention> The problems corresponding to claims 1 and 2 of the present invention are as follows.
In the case of a conventional cordless iron that applies electromagnetic induction (Japanese Patent Laid-Open No. 53-48243), the temperature information on the iron surface is detected,
An on / off signal is transmitted to control the induction heating device on the ironing board side to control the temperature of the iron surface to a constant temperature.

Therefore, the iron body side requires a temperature detection circuit, a set value comparison circuit and a transmission circuit, and the ironing board side requires a complicated electronic circuit such as a reception circuit and a heating coil drive control.

In addition, there are problems in reliability and safety such as reception errors due to wireless transmission and reception.

Further, a direct current power source such as a battery is required to operate the electronic circuit, and it is considered that the replacement is troublesome due to a guild of the battery.

In this way, the iron body alone cannot control the temperature of the iron surface to be constant, and the temperature of the iron surface can be controlled to be constant only when the iron body and the ironing board are combined.

In view of the above points, the claims 1 and 2 of the present invention have an object to provide an electromagnetic induction heating type ironing device that does not require a complicated electronic circuit and can reduce the cost.

The problems to be solved by the present invention are as follows. That is, with regard to the safety of the conventional ironing device, the above measures alone are still insufficient.

For example, regarding the safety when the iron body is left unused on the ironing board, conventionally, if the iron is left stationary for a certain time (1 to 10 minutes), it is in use, or It is not possible to determine whether it is in a neglected state. Therefore, it was not possible to stop heating immediately. In that case, there is a risk that the ironing surface of the clothes may be scraped by the time before the heating is stopped.

Also, regarding the heating prevention control of the magnetic load other than the iron body, the load is determined by the magnitude of the input current. It was dead.

Furthermore, the type of material of the magnetic load depends on the above-mentioned heating efficiency η depending on the positional relationship between the heating coil on the ironing board and the iron body.
However, even if the heating output W of the load is the same, W = η
The value of the input current A differs from × V × A. For this reason, it is difficult to determine the magnitude of the load only by the magnitude of the input current, and if the detection standard is amended, there is a risk of heating other than the intended load.

In view of the above points, the third aspect of the present invention is to provide an electromagnetic induction heating type ironing device that can further improve safety.

<Means for Solving the Problem> According to the means for solving the problem of claim 1 of the present invention, as shown in FIGS. 1 and 2, the ironing board 1 is internally provided with the electromagnetic induction heating device 3, and the iron surface 8 of the iron body 7 is A trowel plate 11 made of a non-magnetic material,
It has a two-layer structure with a body 12 to be heated made of a magnetic material disposed inside the body 12, and the body 12 to be heated can be separated from and close to (including contact with) a trowel plate 11. A temperature-dependent deformable material for controlling the temperature of the iron plate 11 by adjusting the distance between the electromagnetic induction heating device 3 and the heated body 12 between the heated body 12 and the heated body 12.
13 is intervening.

As shown in FIGS. 3 to 6, the problem-solving means of the present invention is the same as that of claim 1 and the main part of the structure to be solved is the electromagnetic induction heating device 3 installed in the ironing board 1 and the iron body. 7 has a two-layer structure of a trowel plate 11 made of a non-magnetic material and a heated body 12 made of a magnetic material disposed inside the trowel plate 11. The heated body 12 has a thin wire shape. In addition, the eddy current generation circuit 14 is formed by connecting the temperature-dependent deformable material 13 that is formed in a coil shape and is opened and closed depending on the temperature of the iron plate 11 to both ends of the heated body 12.

As shown in FIGS. 7 to 11, the problem-solving means of the present invention is the same as that of the second aspect, and the electromagnetic induction heating device 3 is built in the ironing board 1 and the iron surface 8 of the iron body 7 is provided. Is a two-layer structure of a trowel plate 11 made of a non-magnetic material and a heated body 12 made of a magnetic material disposed inside the trowel plate 11,
The heated body 12 is formed in a thin wire shape and a coil shape to form an eddy current generation circuit 14, and the iron body 7
The grip portion 30 is provided with a detection means 31 for detecting the gripping state of the user, and a switch 32 for opening and closing the eddy current generating circuit 14 based on the detection result of the detection means 31 is provided, and the iron body 7 is provided. Opening / closing means for opening / closing the eddy current generation circuit 14
33 is provided, and the ironing board 1 is provided with opening / closing detection means 34 for detecting the open / closed state of the eddy current generating circuit 14,
A control circuit 35 for controlling the electromagnetic induction heating device 3 based on the detection result of the opening / closing detection means 34 is provided.

<Operation> In the problem solving means according to claim 1, the iron surface 8 of the iron body 7 is heated by the high-frequency magnetic field from the electromagnetic induction heating device 3 on the ironing board 1 side. When the temperature of the iron surface 8 rises, the temperature-dependent deformable material 13 between the iron plate 11 and the heated body 12 deforms, and the distance between the heating coil 2 inside the ironing board 1 and the heated body 12 increases. Become. Therefore, the output is automatically reduced and the temperature of the iron surface 8 is lowered. Conversely, when the temperature decreases, the distance between the two and the two decreases, and the heating output increases.

As described above, the iron body 7 does not require a complicated circuit, and the electromagnetic induction heating device 3 on the ironing board 1 side only needs to have a constant output, and the circuit and the control method can be simplified. Temperature control that maximizes the advantages of the electromagnetic induction heating ironing device can be realized.

In the problem solving means according to claim 2, the iron body 8 of the iron body has a two-layer structure, and is generated from the heating coil 2 on the ironing board 1 side by using a non-magnetic material for the iron plate 11 outside the iron surface. The alternating magnetic field is transmitted through the iron plate 11 of the iron surface 8 as it is, and induces an eddy current in the heated body 12 which is a magnetic material on the iron plate 11. At this time, if the body to be heated 12 is coiled so that the eddy current is effectively generated and the magnetic flux penetrates through the coil, if both ends of the coil are closed, the eddy current will flow through the coil. The coil made of a magnetic material flowing in a circulating manner is uniformly heated.

However, at this time, if the wire diameter of the coil to be heated 12 is large, an eddy current flows in the line width of the heated body 12 as shown in FIG. Even if it is open, it is locally heated. Therefore, it is necessary to make the wire diameter of the object to be heated 12 sufficiently thin so as not to burn out, as shown in FIG. 5 (b).

The heated object 12 to be heated raises the temperature of the non-magnetic iron trowel plate 11 therebelow. Since both ends of the heated body 12 are connected by a thermostat 13 or the like, when the temperature of the iron plate 11 rises and the thermostat 13 operates, the heated body 12 becomes an open loop and the heating is stopped. When the temperature decreases, on the contrary, when the temperature decreases, a closed loop is formed, and the heated body 12 is heated,
The temperature of the iron surface is controlled to the temperature set by the thermostat 13.

Since the above temperature control can be performed at all times during use, the temperature of the trowel surface is almost the set temperature as shown in Fig. 6 (b) compared to the case of the heat storage type (Fig. 6 (a)). Can be maintained at.

In the problem solving means according to claim 3, the iron body 7
The trowel surface 8 is divided into two layers, the trowel plate 11 on the lower surface is made of a non-magnetic material such as ceramic, and the heated body 12 is on the upper surface.
When a magnetic material is used to make the magnetic material fine linear and a coil to be heated is formed in a spiral shape, an eddy current is induced by the high frequency alternating magnetic field transmitted through the trowel plate 11 to heat the object to be heated 12. It At this time, if the wire diameter of the heated body 12 made of a magnetic material is small, the induced eddy current flows so as to circulate in the coil. Therefore, when both ends of the coil are open, an eddy current is not induced and heating is not performed. On the contrary, when both ends are closed, an eddy current loop is formed, and the body 12 to be heated is heated by the induced eddy current and heats the iron plate 11 on the lower surface.

In this way, by opening and closing both ends of the heated body 12,
The heating of the iron surface 8 can be controlled.

Further, the open / closed state of both ends of the body 12 to be heated on the iron surface 8 of the iron body 7 is determined by the detection means 31 of the handle portion 30,
The moment the person leaves the iron body 7 on the ironing board 1 and leaves it, the operation is stopped. In other words, a person holds the handle 30 of the iron body 7
The iron surface 8 can be heated only when the iron body 7 is held on the ironing board 1, that is, when the iron body 7 is used for ironing.

Next, in order to distinguish the iron body 7 from the other magnetic material loads, the opening / closing means is arranged to open both ends of the body 12 to be heated in the iron body 7 in a pulse-like constant cycle and only for a moment. When 33 is provided, if both ends of the object to be heated 12 are opened, no eddy current flows and there is no load, and the heating output W becomes almost zero. Further, the input current A on the ironing board 1 side becomes almost 0 except for the opening operation current, which is detected by the open / close detection means 34 such as a current transformer and input to the control circuit 35. In the control circuit 35, if there is a pulse change in the input current, it is determined as the iron body 7, and if the input current is always constant, it is determined as a magnetic load other than the iron body.

Based on the result of this determination, only the target load can be selected and heated.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

[First Embodiment] A first embodiment corresponding to claim 1 of the present invention will be described with reference to Figs.

FIG. 1 is a block diagram showing an entire electromagnetic induction heating ironing device according to the present invention.

Inside the ironing board 1, an induction heating coil 2 and an electromagnetic induction heating device 3 including an inverter circuit for applying a high frequency current to the induction heating coil 2 are provided. An ironing surface 4 made of cloth or the like is formed on the upper surface of the induction heating coil 2.

The electromagnetic induction heating device 3 is supplied with power from a commercial power source through a power cord 5 to generate a high frequency magnetic field.

The generated high-frequency magnetic field passes through the heated object 6 to be ironed, such as clothes placed on the ironing surface 4, and is transferred to the iron surface 8 of the iron body 7 as a magnetic material. Ironing work is performed by heating the heating element 12 and raising the temperature of the iron surface 8.

In actual ironing work, there are a wide range of materials from materials that work at relatively low temperatures such as acrylic, polyester, and nylon to materials that work at relatively high temperatures such as cotton and hemp. The temperature control of the surface 8 is indispensable.

FIG. 2 is a block diagram showing an automatic temperature control unit of the iron surface 8 of the iron body 7 according to the present invention. The iron surface 8 of the iron body 7 has a two-layer structure, and the iron plate 7 on the bottom side in contact with the ironing surface 4 uses a non-magnetic material such as ceramic.
11 is arranged, and a heated body 12 made of a magnetic material such as iron is arranged inside.

The object to be heated 12 can be moved toward and away from the iron plate 11 (including contact). A temperature-dependent deformable material 13 such as a bimetal or a shape memory alloy is interposed between the two 11 and 12 to thermally connect them.

In the above structure, the high frequency magnetic field generated from the heating coil 2 passes through the iron plate 11 without heating, and heats the body 12 to be heated therein. When the temperature of the object to be heated 12 rises, the temperature of the temperature-dependent deformable material 13 that is thermally connected rises, and the deformation starts. The iron plate 11 is fixed to the iron main body 7, but the heated body 12 is not fixed to the iron main body 7 but is fixed only to the temperature-dependent deformable material 13. When deformed, the spatial distance between the iron plate 11 and the heated body 12, that is, the spatial distance between the heating coil 2 and the heated body 12, changes.

One of the features of electromagnetic induction heating is that the output decreases when the spatial distance between the heating coil 2 and the object to be heated 12 is large, and conversely the output increases when the spatial distance is small. Is decided.

Utilizing this, when the temperature of the heated body 12 rises, if the temperature-dependent deformable material 13 is deformed in the direction of increasing the spatial distance, the output is automatically reduced and the heated body 12 is heated.
The temperature will also drop.

In this way, the heating temperature of the object to be heated 12 is kept constant, and the temperature of the iron surface bottom of the iron plate 11 is also kept constant through the temperature-dependent deformable material 13.

Further, as a temperature adjusting means, the upper part of the body to be heated 12 is set so that pressure can be applied by some means, and if the temperature of the iron surface 8 of the iron body 7 is to be raised, the pressure is increased to increase the temperature. When the deformation of the dependent deformable material 13 is suppressed, and conversely, when the temperature is set to a low temperature, the pressure is weakened so that the dependent deformable material 13 can be freely deformed, whereby a simple temperature adjustment can be realized.

In this way, the iron body 7 does not require a complicated electronic circuit, and the cost can be reduced.

Moreover, since the temperature can be controlled only by the iron body, reliability and safety can be improved. Furthermore, since the iron body 7 side does not require a complicated electronic circuit, a DC power source such as a battery is not required on the iron body side, and the battery runs out.
The trouble of replacement is eliminated. Further, the receiving circuit and the heating coil drive control circuit are not required on the ironing board side either.

[Second Embodiment] A second embodiment for claim 2 of the present invention is shown in FIGS.
It will be described with reference to the drawings.

FIG. 3 is a schematic plan view of the iron body of the iron body of the electromagnetic induction heating ironing device according to the present invention, and FIG. 4 is an electric circuit diagram of the electromagnetic induction heating device installed on the ironing board side. Fifth
The figure is a diagram for schematically explaining how the eddy current flows depending on the coil wire diameter. In the figure, (a) shows a case where the wire diameter is large, and (b) shows a case where the wire diameter is small. FIG. 6 (a) is a diagram showing the temperature of the iron surface during use of the heat storage type, and FIG. 6 (b) is a diagram showing the temperature of the iron surface during use of the electromagnetic induction heating type.

As shown in FIG. 3, the iron body 7 has a trowel surface 8 having a two-layer structure, and the ironing surface 4 side is a trowel plate 11 made of a non-magnetic material such as ceramic. A heated body 12 made of a magnetic material is provided so as to be in contact with 11.

The heated body 12 is formed in a thin wire shape and in a coil shape, and a temperature-dependent deformable material 13 that opens and closes depending on the temperature of the iron plate 11 is connected to both ends of the heated body 12 and an eddy current generation circuit 14
Is configured.

The ironing board 1 is provided with a heating coil 2 below the ironing surface 4, and the electromagnetic induction heating device 3 for supplying a high-frequency current to the heating coil 2 converts the AC voltage supplied from the power plug 20 into a DC voltage. A rectifying circuit 21 for conversion, a switching element (power transistor) 22 for performing high frequency switching to supply the direct current rectified by the rectifying circuit 21 to the heating coil 2 as a high frequency current, and the switching.
High frequency inverter 23 for high frequency switching 23
Composed of and. In the figure, 24 is a smoothing capacitor, and 25 is a resonance capacitor.

The deformable member 13 is composed of a thermostat that comes into contact with the iron plate 11 and detects the temperature thereof to open and close.

In the above configuration, the electromagnetic induction heating device 3 on the ironing board side
The high-frequency alternating magnetic field generated from the heating coil 2 of (1) passes through the iron plate 11 which is a non-magnetic body as it is, and induces an eddy current in the non-heated body 12 which is a magnetic body on the iron plate 11.

At this time, if the magnetic material is coiled so that the magnetic flux penetrates through the coil to effectively generate the eddy current, the eddy current circulates in the coil if both ends of the coil are closed. The coil made of a magnetic material flows in such a manner that it is uniformly heated.

However, as shown in FIG. 5 (a), if the wire diameter of the coil to be heated 12 is large, an eddy current flows in the coil wire width and the coil is locally heated even if both ends of the coil are open. Therefore, as shown in FIG. 5B, it is necessary to make the wire diameter of the coil to be heated 12 sufficiently thin so as not to burn out.

The heated object 12 is a non-magnetic trowel plate underneath.
Raise the temperature of 11. Since both ends of the object to be heated are connected by a deformable material 13 such as a thermostat, when the temperature of the trowel plate 11 rises and the thermostat operates, the eddy current generating circuit 14 including the object to be heated 12 goes into an open loop. , The heating stops and the temperature drops.

On the contrary, when the temperature decreases, the thermostat returns to form a closed loop, the object to be heated 12 is heated, and the temperature of the iron surface 8 is controlled to the temperature set by the thermostat.

Since the above temperature control can be performed at all times during use, the temperature of the iron surface 8 has a smaller change than in the case of the heat storage type shown in FIG. 6 (a), and as shown in FIG. 6 (b). In addition, the temperature can be maintained almost at the set temperature.

When changing the set temperature, it can be realized by changing the operating temperature of the thermostat, so no electronic circuit is required in the iron body.

Further, as long as the eddy current generation circuit 14 of the heated body 12 can be opened and closed depending on the temperature, other shape memory alloy, bimetal, etc. may be used without using the thermostat.

Next, regarding the electromagnetic induction heating device 3 on the ironing board 1 side,
As shown in FIG. 4, an AC voltage is supplied from the power plug 20, converted into a DC voltage by the rectifier circuit 21, and supplied to the high frequency inverter 23. The high-frequency inverter 23 applies a high-frequency current to the heating coil 2 on the back side of the hanging surface 4 of the ironing board 1 by performing high-frequency switching of the power transistor 22 to generate a high-frequency alternating magnetic field, and the iron surface 8 of the iron body on the ironing board. The eddy current is induced to heat.

At this time, since the temperature is controlled only by the iron body 7 as described above, the power transistor 22 is provided on the ironing board 1 side.
It is not necessary to change the ON time of the high frequency switching by the high frequency inverter 23 to change the current flowing through the heating coil 2. Therefore, on the ironing board 1 side, it is only necessary to control to a constant coil current.

As described above, according to the electromagnetic induction heating type ironing device of the present invention, the ironing body is made cordless, and the ironing is performed without having a complicated electronic circuit in the ironing body as in the heat storage type cordless ironing device. The temperature of the iron surface 8 can be controlled at all times even during work, the set temperature can be maintained, and highly accurate temperature control can be realized, so that the temperature of the iron surface 8 is wide. The area can be ironed continuously.

Moreover, since the temperature control can be performed only by the iron body, the electromagnetic induction heating device 3 on the ironing board side can be controlled.
When the heating output is changed in accordance with the temperature, no complicated control is required anymore, a constant heating output is always required, and the electromagnetic induction heating device can be simplified.

Furthermore, since it is not necessary to exchange signals between the iron main body 7 and the ironing board 1, it is possible to prevent malfunctions such as signal reception errors and improve reliability.

Further, the electromagnetic induction heating has a different heating principle from the heater heating and has good heating efficiency, so that it is possible to realize merits which the conventional ironing device does not have, such as shortening the preheating time and speeding up the temperature control.

[Third embodiment]

A third embodiment corresponding to claim 3 of the present invention is shown in FIGS.
It will be described with reference to FIG.

Fig. 7 is an electric circuit diagram inside the iron body, 8, 9
1 is a side view and a plan view of an iron body of an electromagnetic induction heating type ironing device of the present invention. Fig. 10 is an electric circuit diagram of the electromagnetic induction heating device on the ironing board side, and Figs. 11 (a) and (b).
Is a diagram showing a change in the input current value detected by the opening / closing detection means. FIG. 7A shows the case of the iron body, and FIG. 7B shows the case of another magnetic load.

As shown in the drawing, in the ironing device according to the present invention, the ironing board 1 is internally provided with the electromagnetic induction heating device 3, and the ironing surface 8 of the iron body 7 is provided with the ironing plate 11 made of a non-magnetic material and the inside thereof. And a heated body 12 made of a magnetic material, and has a two-layer structure.

The heated body 12 is formed in a thin wire shape and in a coil shape to form an eddy current generation circuit 14.

The grip portion 30 of the iron body 7 is provided with a detection means 31 for detecting the gripping state of the user, and a switch 32 for opening and closing the eddy current generating circuit 14 based on the detection result of the detection means 31.
Is provided.

On the other hand, the iron body 7 is provided with opening / closing means 33 for opening / closing the eddy current generating circuit 14. The ironing board 1 is provided with an open / close detecting means 34 for detecting the open / closed state of the eddy current generating circuit 14, and a control circuit 35 for controlling the electromagnetic induction heating device 3 based on the detection result of the open / close detecting means 34.
Is provided.

As shown in FIG. 7, the detecting means 31 has two electrode plates 40 and 41 arranged on both sides of the handle portion 30 and a base current flows when a potential difference is generated between the two electrode plates 40. And a relay coil 44 that is excited by the ON operation of the transistor 43. The switch 32
Is a relay switch that is turned on by exciting the relay coil 44. In the figure, 45 is a capacitor and 46 and 47 are diodes.

On the other hand, the opening / closing means 33 is for opening / closing the eddy current generating circuit 14 in a pulsed manner, and is connected to a voltage generated in the object to be heated 12 or a power source using a storage battery to repeat charging / discharging resistance R.
And a capacitor C, an amplifier 49 having a negative terminal connected to an intermediate point between these and a positive terminal connected to an intermediate point between the resistors R1 and R2, and an eddy current generating circuit 14 connected to an output terminal of the amplifier 49 to turn on and off. It consists of a relay 50 and a relay.

The relay contact 50a of the relay 50 is interposed in the eddy current generation circuit 14. The amplifier 49 is configured to turn off the relay 50 when the voltage of the capacitor C becomes higher than the reference voltage, and the eddy current generating circuit is pulsed at a constant cycle.
It releases 14 for a moment.

The ironing board 1 has a trowel plate as in the second embodiment.
In addition to 11, as described above, the opening / closing detection means 34 and the control circuit 35
And have.

As shown in FIG. 10, the open / close detection means 34 is composed of a current transformer that detects the input current of the AC power supply, and its signal is input to the control circuit 35.

The control circuit 35 is a general one-chip microcomputer, and is a judgment means for judging whether or not there is a pulse change in the input current, and turns off the high frequency inverter 23 when the judgment result shows no pulse change. Inverter control means for outputting a signal to turn on when there is a change.

In the above configuration, the high frequency alternating magnetic field generated from the heating coil of the electromagnetic induction heating device 3 on the ironing board 1 side is the iron plate.
11 is transmitted as it is, and an eddy current is induced in the object to be heated 12 above it. At this time, if the wire diameter of the heated body 12 is small, the induced eddy current flows to circulate in the heated body 12, so by short-circuiting or opening both ends of the heated body 12, this eddy current is generated. The loop through which the current flows can be opened and closed, and the heating state of the iron surface 8 can be controlled.

Utilizing this, the handle portion 30 of the iron main body is provided with a means 31 for detecting that a person grips it so that the iron surface 8 is heated only when the person is ironing it. To close. When a person grips the handle portion 30 of the iron body 7, the two electrode plates 40 and 41 are electrically connected through the human body. Then, since the displacement current induced from the power line of the commercial power source flows through the human body, a potential is generated between the two electrode plates 40 and 41 as shown in FIG. Is turned on, and as a result, the relay 44 is turned on, and its contact, the switch 32, is turned on.
The eddy current generation circuit 14 forms a closed loop, the object to be heated 12 is heated, and the iron surface 8 is heated.

On the contrary, when the iron body 7 is just placed on the ironing board, no electric potential is generated between the two electrode plates 40 and 41, the relay 44 is turned off, and the eddy current loop of the heated body 12 is generated. However, even if a high frequency alternating magnetic field is applied, the iron surface 8 is not heated.

Next, in order to determine whether the load on the ironing board is the iron body 7 or a magnetic material load other than the iron, as shown in FIG. 7, the eddy current loop of the heated body 12 is opened by the opening / closing means 33. The pulse is opened for a moment at a constant cycle.

Since the eddy current loop is formed when the iron body 7 is in use, the eddy current does not flow and there is no load when the iron body 7 is opened for a moment, and electromagnetic induction heating on the ironing board side shown in FIG. The input current value of the device 3 changes.

This change in the input current value is detected by the current transformer, which is the opening / closing detecting means 34, and is input to the control circuit 35. At this time, the change in the input current value of the iron body 7 and the other magnetic load becomes as shown in FIG. 11, and in the control circuit 35,
Detecting the pulse change of this input current, iron body 7
Is on the ironing board, the high-frequency inverter 23 is operated, the power transistor 22 is high-frequency switched, a high-frequency current is passed through the heating coil 2, a high-frequency alternating magnetic field is generated, and the iron body 7 of the ironing board is placed on the ironing board. The surface 8 is heated by inducing an eddy current.

At this time, since the heated body 12 of the iron body 7 is opened only for a moment in a pulsed manner, the temperature of the iron surface 8 is hardly affected and the set temperature can be maintained.

Conversely, if the input current has a constant value with no pulse change,
The control circuit 35 determines that there is another magnetic load on the ironing board, stops the high frequency inverter 23, and turns off the power transistor 22. Therefore, no high-frequency alternating magnetic field is generated and no heating is performed regardless of the magnetic load on the ironing board.

In this way, regarding the safety of the ironing device, which has been a problem in the past, 1) Due to the electromagnetic induction heating type, the iron body will not be heated except on the ironing board, and can be cooled by leaving it after use, It is possible to prevent the risk of fire caused by forgetting to disconnect the electric cord as in the past.

2) Instantaneous after the iron body 7 leaves the hand of the person and is left on the ironing board by the heated body 12 on the iron surface 8 of the iron body 7 and the detection means 31 of the handle portion 30 which utilizes the property of electromagnetic induction. The heating can be stopped, and the heating cannot be stopped until a certain time elapses as in the conventional case, and the clothes are not scraped before the heating is stopped.

3) In the case of the electromagnetic induction heating type, a magnetic material load equivalent to that of the iron body may be heated when placed on the ironing board, but in the present invention, magnetic material loads other than the iron body can be distinguished from the iron body. Therefore, it will not be heated.

As described above, it is considered that it is possible to provide a step in safety as compared with the conventional ironing device.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

<Effect of Device> As is clear from the above description, according to claim 1 of the present invention, the iron surface of the iron body has a two-layer structure of a non-magnetic body and a magnetic body, and the iron body is made of a magnetic body by a temperature-dependent deformable material. The distance to the heating coil on the ironing board side is changed, and according to claim 2 of the present invention, there is a temperature-dependent deformable material that opens and closes depending on the temperature of the iron surface, so the temperature of the iron surface is constant only with the iron body. The iron body does not require a complicated electronic circuit, and the cost can be reduced. In addition, since the temperature of the iron surface can be controlled to be constant with only the iron body, reliability,
The safety can be increased.

Furthermore, since a complicated electronic circuit on the iron body side is not required, a DC power source such as a battery is not required on the iron body side, and the battery runs out and the trouble of replacement is eliminated.

Further, the receiving circuit and the heating coil drive control circuit are not required on the ironing board side.

Also, according to claim 3 of the present invention, the iron body is left on the ironing board away from the hand of the person by means of the heated body on the iron surface of the iron body and the detection means of the handle portion utilizing the property of electromagnetic induction. The heating can be instantaneously stopped from here, and the heating cannot be stopped until a certain time has passed as in the conventional case, and clothes are not scraped before the heating is stopped.

In addition, in the case of the electromagnetic induction heating type, there is a risk that the magnetic body load equivalent to the iron body will be heated when placed on the ironing board, but in the present invention, magnetic body loads other than the iron body can be distinguished from the iron body. Therefore, it will not be heated.

As described above, it is possible to provide safety that is one step higher than that of the conventional ironing device.

[Brief description of drawings]

FIG. 1 is a block diagram showing the entire electromagnetic induction heating type ironing apparatus according to the first embodiment of the present invention, and FIG. 2 is a block diagram showing an automatic temperature control unit for the iron surface of the iron body. FIG. 3 is a schematic plan view of the iron surface of the iron body of the electromagnetic induction heating ironing apparatus according to the second embodiment of the present invention, and FIG. 4 is an electric circuit diagram of the electromagnetic induction heating apparatus installed on the ironing board side. FIG. 5 is a diagram schematically illustrating how eddy currents flow depending on the coil wire diameter. FIG. 5A shows a case where the wire diameter is large, and FIG. 5B shows a case where the wire type is small. FIG. 6 (a) is a diagram showing the iron surface temperature during use of the heat storage ironing device, and FIG. 6 (b) is a diagram showing the iron surface temperature during use of the electromagnetic induction heating system. FIG. 7 is an electric circuit diagram installed in the iron body of the ironing device according to the third embodiment of the present invention, FIGS. 8 and 9 are side and plan views of the iron body, and FIG. 10 is electromagnetic induction heating of the ironing board. An electric circuit diagram of the apparatus, FIGS. 11 (a) and 11 (b) are diagrams showing changes in the input current value detected by the opening / closing detection means, and FIG. 11 (a) shows the case of the iron body, FIG. Indicates the case of another magnetic material load. 1: Ironing board, 2: Heating coil, 3: Electromagnetic induction heating device, 7:
Iron body, 8: Iron surface, 11: Iron plate, 12: Heated object, 1
3: Temperature-dependent deformable material, 14: Eddy current generation circuit, 30: Handle part, 32: Switch, 33: Opening / closing means, 34: Detection means, 35: Control circuit.

Claims (3)

[Scope of utility model registration request] 1. An iron board is equipped with an electromagnetic induction heating device, and a trowel surface of an iron body is a two-layer structure comprising a trowel plate made of a non-magnetic material and a body to be heated made of a magnetic material arranged inside the trowel plate. The structure is such that the object to be heated can be moved closer to and away from the iron plate, and the distance between the electromagnetic induction heating device and the object to be heated is adjusted between the iron plate and the object to be heated. An electromagnetic induction heating ironing device characterized in that a temperature-dependent deformable material for controlling temperature is interposed. 2. An iron board is internally provided with an electromagnetic induction heating device, and a trowel surface of the iron body is a two-layer structure comprising a trowel plate made of a non-magnetic material and a body to be heated made of a magnetic material disposed inside the trowel plate. The heated body is formed into a thin wire shape and a coil shape, and a temperature-dependent deformable material that opens and closes according to the temperature of the iron plate is connected to both ends of the heated body to form an eddy current generation circuit. An electromagnetic induction heating type ironing device characterized in that 3. An iron board is internally provided with an electromagnetic induction heating device, and a trowel surface of an iron body is a two-layer structure comprising a trowel plate made of a non-magnetic material and a body to be heated made of a magnetic material arranged inside the trowel plate. The heated body has a thin wire shape and is formed in a coil shape to form an eddy current generating circuit, and the grip portion of the iron body is provided with a detection means for detecting a gripping state of a user. A switch that opens and closes the eddy current generating circuit based on the detection result of the detection means is provided, and an opening and closing means that opens and closes the eddy current generating circuit is provided in the iron body, and the ironing board opens and closes the eddy current generating circuit. An electromagnetic induction heating ironing device comprising: an opening / closing detecting means for detecting; and a control circuit for controlling the electromagnetic induction heating device based on a detection result of the opening / closing detecting means.