JPH0821466B2 - Electromagnetic induction heating coil for liquid heating - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid heating electromagnetic induction heating coil used for heating a liquid such as a boiler, a steamer, a fryer, and a boiled noodle cooker.

[0002]

2. Description of the Related Art Conventionally, a general structure of an electromagnetic induction heating coil used for this type of heating is shown in FIG.
Also, there are those as shown in FIG. 8 and FIG. First,
The electromagnetic induction heating coil having the structure illustrated in FIGS. 7 and 8 uses the yoke 1 that forms a magnetic path. FIG. 7 is a partially cutaway front view of this conventional electromagnetic induction heating coil,
FIG. 8 is a side view of the electromagnetic induction heating coil of FIG. 7. As shown in FIGS. 7 and 8, in this conventional electromagnetic induction heating coil, an electromagnetic coil 2 is wound around each leg of a yoke 1, and a heating portion 3 is further provided around each electromagnetic coil 2. It has been given. In this conventional electromagnetic induction heating coil, when the electromagnetic coil 2 is energized, a magnetic flux is generated in the yoke 1, which causes the heat generating portion 3 to generate heat by electromagnetic induction heating.

Further, in the conventional electromagnetic induction heating coil shown in the partial sectional view of FIG. 9, a flat electromagnetic coil 5 is arranged on a ferrite plate 4 which constitutes a magnetic path, and a heating portion is provided on the flat electromagnetic coil 5. A certain heating target plate 6 is arranged. In this conventional electromagnetic induction heating coil, when the electromagnetic coil 5 is energized, a magnetic flux is generated in the ferrite 4, and the heat generation target plate generates heat by electromagnetic induction heating.

[0004]

The conventional electromagnetic induction heating coil as described above requires a yoke and a ferrite plate as a magnetic path in addition to the electromagnetic coil and the heating target, and the weight of the whole is inevitable. Was heavy. Further, when these electromagnetic induction heating coils are incorporated into a device, the arrangement of the coils is inevitably limited by the shapes of the yoke and the ferrite plate forming the magnetic path. Furthermore, in the structure of the conventional heating coil, only the outer surface of the electromagnetic coil is used for heat generation, and the heat transfer area is smaller than the volume of the entire electromagnetic induction coil.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide an electromagnetic induction heating coil for heating a liquid, which is lightweight, compact, and can be freely laid out.

[0006]

An electromagnetic induction heating coil for heating a liquid according to the present invention comprises a pipe-shaped exterior member made of a material which is resistant to corrosion by a liquid to be heated and is suitable for electromagnetic induction heating. The pipe-shaped outer casing has a hollow portion that penetrates in the extension direction so that a liquid to be heated can enter from the outside, an outer peripheral wall portion surrounding the hollow portion, and an outer peripheral wall portion of the outer peripheral wall portion. It has a structure having a coil arrangement space formed inside and extending around the hollow portion, and an electromagnetic coil wound so as to surround the hollow portion is arranged in the coil arrangement space. In addition, a power feeding portion for energizing the electromagnetic coil is drawn out from the pipe-shaped exterior.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to FIGS.
The present invention will be described in more detail with reference to examples of the present invention.

FIG. 1 is a partial sectional perspective view showing an electromagnetic induction heating coil for heating a liquid as an embodiment of the present invention.
FIG. 2 is a perspective view showing the entire electromagnetic induction heating coil for heating liquid in FIG. As shown in FIGS. 1 and 2,
The electromagnetic induction heating coil for heating a liquid according to this embodiment has a pipe-like outer casing 20 made of a material having corrosion resistance to a liquid to be heated, for example, water, tempura oil, etc. and suitable for electromagnetic induction heating. And inside this pipe-shaped exterior 20,
Electromagnetic coil 1 arranged along the extension direction of the pipe
0, and a power feeding portion 11 for energizing the electromagnetic coil 10 is drawn out from the pipe-shaped exterior 20.

The operating principle of the electromagnetic induction heating coil of this embodiment will be described with reference to FIG. FIG. 3 is an enlarged schematic view of one end portion of the electromagnetic induction heating coil in a partial sectional perspective view. As shown in FIG. 3, when the electromagnetic coil 10 embedded in the pipe-shaped exterior 20 is energized, a magnetic flux MF is generated through the pipe-shaped exterior 20. Due to such magnetic flux MF, eddy current EC is applied to the pipe-shaped exterior 20.
Flow, which causes the pipe-shaped exterior 20 to generate heat.

4 and 5 are schematic views showing a more concrete embodiment of the electromagnetic induction heating coil for heating a liquid according to the present invention. FIG. 4 is a longitudinal sectional view thereof and FIG. 5 is a plan view thereof. Is. In this specific example, a power feeding portion 11 for energizing the electromagnetic coil 10 is passed through the outer periphery of the pipe-shaped outer casing 20, and the heating coil is fixed to the inner wall of the container containing the liquid to be heated. A stay portion 21 is provided for this purpose.

FIG. 6 is a schematic view showing a state in which the heating coil shown in FIGS. 4 and 5 is mounted in a container 30 containing a liquid to be heated such as water or tempura oil to perform heating. . The heating coil is attached and fixed to the inner wall of the container 30 via the stay portion 21 of the pipe-shaped exterior 20. When the electromagnetic coil in the pipe-shaped exterior 20 is energized in such a state, the liquid is heated by the heat generated from the outer surface and the inner surface of the pipe-shaped exterior 20.

At this time, since the heat generated by the copper loss of the electromagnetic coil 10 is also transmitted to the liquid through the outer surface and the inner surface of the pipe-shaped exterior 20, it is possible to eliminate the waste of heat quantity.
Conversely, this is advantageous because it suppresses the temperature rise of the electromagnetic coil itself.

[0013]

According to the structure of the electromagnetic induction heating coil of the present invention, the exterior forms a magnetic path, and all the magnetic field energy from the electromagnetic coil is consumed by the eddy current generated in the exterior. Therefore, a separate magnetic path structure such as a conventional yoke or ferrite plate is not required, so that the number of parts can be reduced, and the weight and the size can be reduced.

If the material forming the pipe-shaped exterior is made elastic, the electromagnetic induction heating coil as a whole can be made elastic, and can be freely arranged when it is incorporated into a device. Becomes

Furthermore, since not only the outer surface of the pipe-shaped exterior but also the inner surface can be the heating surface, the heat transfer area can be increased and the heating efficiency can be increased. Moreover, the heat generated by the copper loss of the electromagnetic coil is also transmitted to the liquid through the outer surface and the inner surface of the pipe-shaped exterior, so that the amount of heat can be saved. This, on the contrary,
This is advantageous because it suppresses the temperature rise of the electromagnetic coil itself.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional perspective view showing an electromagnetic induction heating coil for heating liquid as an embodiment of the present invention.

FIG. 2 is a perspective view showing the whole of an electromagnetic induction heating coil for heating liquid in FIG.

FIG. 3 is an enlarged schematic cross-sectional perspective view of one end of the electromagnetic induction heating coil shown in FIG.

FIG. 4 is a schematic vertical sectional view showing a more specific embodiment of the electromagnetic induction heating coil for heating liquid of the present invention.

FIG. 5 is a plan view of the electromagnetic induction heating coil for heating the liquid in FIG.

FIG. 6 is a schematic view showing a state in which the heating coil shown in FIGS. 4 and 5 is mounted in a container containing a liquid to be heated such as water or tempura oil to perform heating.

FIG. 7 is a partially cutaway front view showing an example of a conventional electromagnetic induction heating coil.

8 is a side view of the electromagnetic induction heating coil of FIG. 7. FIG.

FIG. 9 is a partial cross-sectional view showing another example of a conventional electromagnetic induction heating coil.

[Explanation of symbols]

 10 Electromagnetic Coil 11 Power Supply Section 20 Pipe-Shaped Exterior 21 Stay Section 30 Container

Claims (2)

[Claims] 1. A pipe-shaped sheath formed of a material having corrosion resistance to a liquid to be heated and suitable for electromagnetic induction heating, the pipe-shaped sheath penetrating in an extension direction thereof. A hollow portion that allows a liquid to be heated to enter from the outside, an outer peripheral wall portion surrounding the hollow portion, and a coil arrangement that is formed inside the outer peripheral wall portion and extends around the hollow portion. It has a structure having a space, in the coil arrangement space, an electromagnetic coil wound so as to surround the hollow portion is arranged,
An electromagnetic induction heating coil for heating a liquid, wherein a power feeding portion for energizing the electromagnetic coil is drawn out from the pipe-shaped exterior. 2. A stay portion is provided on the outer periphery of the pipe-shaped exterior for passing the power feeding portion and fixing the heating coil to an inner wall of a container containing a liquid to be heated. 1. An electromagnetic induction heating coil for heating a liquid according to 1.