JPH0670849A - Electromagnetic water heater - Google Patents

Abstract

PURPOSE:To prevent the water heater from being heated in water-empty state, and to improve safety by constituting it so that a power source cannot be supplied to a work coil unless an electromagnetic vessel exceeds a set load. CONSTITUTION:In the electromagnetic water heater constituted so that an electromagnetic vessel 1 consisting of a magnetic material is arranged in a placing part 3 on a work coil 4, water poured into the electromagnetic vessel 1 is heated and hot water is boiled, a weight detecting switch 8 operated at the time when a load exceeding a set load is applied to the placing part 3 is provided. When the electromagnetic vessel 1 placed on this placing part 3 exceeds a set load, a power source can be supplied to the work coil 4. Since this water heater is constituted in such a way, when water of half or more by a scale is poured into the electromagnetic vessel 1, a switch holder 11 of the placing part 3 is deformed and the weight detecting switch 8 is turned on, and a high frequency current is supplied to the work coil 4. When water is not poured into the electromagnetic vessel 1, etc., the weight detecting switch 8 is turned off and the high frequency current is not supplied to the work coil 4, therefore, the water heater is prevented from being heated in water-empty state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic water heater suitable for use in a guest room of a hotel, for example.

[0002]

2. Description of the Related Art Generally, in a guest room of a hotel or the like, an electromagnetic water heater capable of heating tea without using fire is used for each customer to brew tea or the like.

As shown in FIGS. 4 and 5, this electromagnetic water heater uses an electromagnetic container so-called electromagnetic server 1 made of a magnetic material such as stainless steel, and the electromagnetic container 1 is provided at a substantially central portion of an upper case 2. For example, place it on the circular placing section 3,
A high-frequency current is supplied from a predetermined electronic circuit to the work coil 4 arranged below the mounting portion 3 to heat the water injected into the electromagnetic container 1 to boil the hot water.

Since such an electromagnetic water heater is heated without using fire, it is relatively safe.

[0005]

In such a conventional electromagnetic water heater, a temperature detector 5 is provided below the mounting portion 3 in order to prevent the air from being cooked. For example, a rapid temperature rise of the container 1 is detected and transmitted to an electronic circuit, and the electronic circuit stops the power supply to the work coil 4.

However, in such a conventional structure for detecting a rapid rise in temperature and transmitting it to an electronic circuit, when the temperature detector 5, the transmission circuit and the electronic circuit are defective, this empty cooking is performed. There was an inconvenience that could not be prevented.

In the conventional electromagnetic water heater, the electromagnetic container 1 may reach a temperature of 300 ° C. or more in the case of air cooking. Therefore, a ceramic plate is used as the mounting portion 3 in the upper case 2 made of synthetic resin. It is fixed with adhesive 6 etc.,
The structure is so complicated that it is expensive. In FIG. 4, 7 is a power switch for turning on and off the power to the work coil 4.

In view of the above point, the present invention has an object to prevent air-cooking with a relatively simple structure.

[0009]

In the electromagnetic water heater of the present invention, as shown in FIGS. 1 and 2, for example, an electromagnetic container 1 made of a magnetic material is placed on a mounting portion 3 on a work coil 4 and the electromagnetic container Container 1
In the electromagnetic water heater that heats the water injected into the container to boil the water, a weight detection switch 8 that operates when a load greater than a set load is applied to the mounting portion 3 is provided.
When the electromagnetic container 1 placed on the work coil has a load equal to or more than the set load, power can be supplied to the work coil 4.

The electromagnetic water heater of the present invention is, for example, as shown in FIGS.
Further, as shown in FIG. 3, in the above description, the weight detection switch 8 is provided in series with the power switch 7 of the work coil 4.

The electromagnetic water heater of the present invention is, for example, as shown in FIGS.
As described above, in the above description, the mounting portion 3 has a predetermined shape,
The weight detection switch 8 can be operated when the electromagnetic container 1 having a predetermined shape is placed.

[0012]

According to the present invention, power cannot be supplied to the work coil 4 unless the electromagnetic container 1 has a load equal to or greater than the set load, so that the cooked state does not occur.

Further, according to the present invention, even if the electronic circuit (automatic stop circuit, abnormal temperature prevention circuit, etc.) has a failure during the boiling water operation, when the electromagnetic container 1 becomes less than the set load, the work coil 4 It is safe because power is not supplied to the.

Further, according to the present invention, since it is not in an empty state, the temperature of the electromagnetic container 1 rises only up to about 110 ° C., and the mounting portion 3 is made of the same heat-resistant synthetic resin as the upper case 2, for example, PET, The mounting portion 3 can be formed of PPS and can be formed integrally with the upper case 2.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the electromagnetic water heater of the present invention will be described below with reference to FIGS. 1, 2 and 3. In FIGS. 1, 2 and 3, the parts corresponding to those in FIGS. 4 and 5 are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 2 shows the electromagnetic water heater according to this embodiment as a whole, and the upper case 2 of the electromagnetic water heater has a heat resistance of, for example, 2
It is made of synthetic resin such as PET or PPS at about 00 ° C., and the circular mounting portion 3 of the electromagnetic container 1 is formed integrally with the upper case 2.

In this case, the boundary between the mounting portion 3 and the upper case 2 is formed into a protruding shape 9 and the mounting portion 3 is formed slightly lower than the upper case 2.

Further, as shown in FIG. 1, a work coil 4 to which a high-frequency current is supplied from a predetermined electronic circuit 10 is arranged below the mounting portion 3.

Further, in this example, as shown in FIGS. 1 and 2, a switch holder 11 which is deformed when the load exceeds a set load is provided at the center of the mounting portion 3.

The switch holder 11 is made of, for example, silicon rubber and is fitted and fixed in a hole formed in the center of the mounting portion 3.
A pressing protrusion 11a for controlling the on / off of the weight detection switch 8 is provided in the lower center of 1.

The weight detection switch 8 is arranged below the pressing projection 11a so that its operation button is opposed.

The set load at which the switch holder 11 is deformed is set such that, for example, about half of the scale on the prescribed electromagnetic container 1 is filled with water.

In FIG. 1, 12 is a switch holder 11.
The stopper for the deformation of
Thus, the operation button of the weight detection switch 8 is prevented from being pressed for a predetermined stroke or longer.

The weight detection switch 8 is connected in series to the power switch 7 of the electronic circuit 10 for controlling the work coil 4, as shown in FIG.

Further, in the present example, a temperature detector 13 for detecting a temperature of, for example, 160 ° C. to 170 ° C. is provided below the mounting portion 3.
Is provided, and the temperature of the mounting portion 3 is set to 1 due to some reason.
The power switch 7 is turned off when the temperature reaches 60 ° C to 170 ° C.

Since this example is constructed as described above, when more than half of the scale is filled with water in the electromagnetic container 1, the switch holder 11 of the mounting portion 3 is deformed and the weight detection switch 8 is turned on. Since the high frequency current can be supplied to the work coil 4, the switch holder 11 does not deform and the weight detection switch 8 does not deform when water is not injected into the electromagnetic container 1 or when the scale is less than half. Even if the power switch 7 is turned on, the high frequency current is not supplied to the work coil 4 and there is an advantage that the cooking coil 4 does not enter an empty state.

Further, according to this example, even if there is a failure in the electronic circuit (automatic stop circuit, abnormal temperature prevention circuit, etc.) 10 during the operation of boiling water, the water present in the electromagnetic container 1 is less than half the scale. At this time, the deformation of the switch holder 11 returns, the weight detection switch 8 is turned off, and high frequency current is not supplied to the work coil 4, which is an advantage of safety.

Further, according to the present example, since the state of the cooked state does not come to an empty state, the temperature of the electromagnetic container 1 rises only up to about 110 ° C., and the mounting portion 3 is made of the same heat-resistant synthetic resin as that of the upper case 2, for example PET or PPS. The mounting portion 3 can be formed integrally with the upper case 2 and can be formed by integral molding, etc., which is advantageous in that the manufacturing is easy and the cost is low.

Further, in this example, the placing portion 3 and the upper case 2 are used.
Since the boundary portion of the mounting portion 3 has the protruding shape 9, the switch holder 11 cannot be deformed and the weight detection switch 8 can be turned on depending on an electromagnetic container or other object having a bottom larger than the circular shape of the mounting portion 3. In addition, the high-frequency current is not supplied to the work coil 4, the weight detection switch 8 can be turned on only by the predetermined electromagnetic container 1, and no malfunction occurs.

More positively, the shape of the mounting portion 3 should be specified such that the cross section has a corrugated shape (the switch holder 11 portion is the bottom of the wave), and the bottom of the electromagnetic container 1 also conforms to this cross sectional waveform. Moreover, there is an advantage that the weight detection switch 8 is less likely to malfunction.

Further, in this example, the temperature detector 13 is provided, and the mounting portion 3 is placed at 160 ° C. to 170 ° C. for some reason.
Since the power switch 7 is turned off when it becomes, there is an advantage that the mounting portion 3 made of synthetic resin is not deformed due to temperature.

The present invention is not limited to the above-described embodiments, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

[0033]

According to the present invention, power cannot be supplied to the work coil unless the electromagnetic container has a load equal to or more than a set load, and therefore, there is an advantage that the cooked state does not occur.

Further, according to the present invention, even if there is a failure in the electronic circuit during the boiling water operation, when the electromagnetic container becomes less than the set load, no power is supplied to the work coil, which is a safety advantage.

Further, according to the present invention, since it is not in the state of being cooked in the air, the temperature of the electromagnetic container rises only up to about 110 ° C., and this mounting portion can be made of the same heat-resistant synthetic resin as the upper case, Since the mounting portion and the upper case can be integrally formed, there is an advantage that the manufacturing becomes easier and the cost becomes lower.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of an embodiment of an electromagnetic water heater of the present invention.

FIG. 2 is a perspective view showing an embodiment of the electromagnetic water heater of the present invention.

FIG. 3 is a circuit configuration diagram of an embodiment of the electromagnetic water heater of the present invention.

FIG. 4 is a perspective view showing an example of a conventional electromagnetic water heater.

5 is a cross-sectional view showing the main parts of FIG.

[Explanation of symbols]

 1 Electromagnetic Container 2 Upper Case 3 Placement Part 4 Work Coil 7 Power Switch 8 Weight Detection Switch 9 Projection Shape 10 Electronic Circuit 11 Switch Holder 12 Stopper

Claims (3)

[Claims] 1. An electromagnetic water heater in which an electromagnetic container made of a magnetic material is arranged in a mounting portion on a work coil, and water poured into the electromagnetic container is heated to boil hot water. A weight detection switch that operates when a load greater than the set load is applied to the part so that power can be supplied to the work coil when the electromagnetic container placed on the mounting part is above the set load. An electromagnetic water heater characterized in that 2. The electromagnetic water heater according to claim 1, wherein the weight detection switch is provided in series with a power switch of the work coil. 3. The electromagnetic water heater according to claim 1, wherein the mounting portion has a predetermined shape, and the weight detection switch can be operated when the electromagnetic container having the predetermined shape is mounted. Characteristic electromagnetic water heater.