KR100827468B1 - Electric boiler using high frequency induction heaing - Google Patents

Abstract

An electric boiler is provided to transfer uniformly and quickly heat into a heating cylinder by increasing the heated area, and allow for smooth flow of fluid by guiding the straight flow. An electric boiler includes a heating cylinder(10), a second tubular heater(32), a first tubular heater(31), and induction coils(21,22). The heating cylinder has an internal space, and a water inlet and a water outlet. The second tubular heater is arranged in the heating cylinder. The first tubular heater is arranged in the second tubular heater. The induction coils are arranged between the second tubular heater and the first tubular heater.

Description

High Frequency Induction Heating Electric Boiler {ELECTRIC BOILER USING HIGH FREQUENCY INDUCTION HEAING}

1 is a block diagram conceptually showing a high frequency induction heating type electric boiler of the present invention.

Figure 2 is a cross-sectional view showing an electric boiler of the high frequency induction heating method according to a first embodiment of the present invention.

3 is a cross-sectional view taken along the line A-A of FIG.

4 is a bottom view taken along the line B in FIG. 2;

5 is a cross-sectional view showing an electric boiler of a high frequency induction heating method according to a second embodiment of the present invention.

Brief description of symbols for the main parts of the drawings

10: heating tube 21, 22: induction coil

31, 32: 1st and 2nd heating body

The present invention relates to a boiler, and more particularly to an electric boiler using a high frequency induction heating method.

A boiler is a device that burns fossil fuel such as petroleum, coal, and gas and transmits the heat of combustion to water to heat it. In recent years, the price continues to rise as resources such as petroleum and gas are gradually exhausted. Since there is a problem of environmental pollution due to the generation of various harmful gases in the burning process, in recent years electric boilers using electric energy has been widely used.

The electric boiler adopts a direct heating method in which a heating coil is disposed on the outer circumference of the heating tube, and heats the heating coil or the liquid in the heating tank by heating the heating coil by applying electrical energy to the heating coil. Electric boilers by coils take a long time to heat up, consumes a lot of power, and has a very complicated structure, such as an insulation structure for preventing heat generated from a heating coil from dissipating to the outside.

Accordingly, recently, an electric boiler using a high frequency induction heating method has been disclosed in order to overcome the disadvantages of a boiler and a direct heat type electric boiler using fossil fuel.

In the high frequency induction heating method, when a high frequency current is applied to the induction coil side, a high frequency magnetic field is generated on the induction coil side, and the high frequency magnetic field causes loss of eddy current (eddy current) or hysteresis loss generated in a heating tube made of a magnetic material. The heating box itself generates heat.

However, such a conventional high-frequency induction heating electric boiler is not able to heat the liquid in the heating tube uniformly and quickly, so that the heating efficiency is substantially lowered, and it takes a long time to heat up to a constant temperature and its power consumption There are still big drawbacks.

The present invention has been made in view of the above, and by greatly increasing the total heating area heated by high frequency induction heating, the heat transfer into the heating vessel is more uniformly and quickly delivered and the heating efficiency is greatly increased. The purpose is to provide a high-frequency induction heating electric boiler that can be made.

In addition, an object of the present invention is to provide a high-frequency induction heating type electric boiler that can further improve the heating efficiency of the liquid by inducing the flow of the liquid in a linear direction more smoothly. .

In addition, an object of the present invention is to provide an electric boiler of the high frequency induction heating method that can prevent the bubbles generated during the heating of the liquid passing through the inside of the heating tube by the high frequency induction heating.

The present invention for achieving the above object,

Heating tube;

Induction coil provided inside the heating vessel;

A first heating body disposed on the inner side of the induction coil; And

It includes; the second heating body disposed on the outer surface of the induction coil.

The induction coil is characterized in that the two or more induction coils are connected in parallel between the first and second heating elements arranged in the longitudinal direction of the heating tube.

The induction coil has a bobbin of a heat resistant material on its inner circumferential surface and its outer circumferential surface.

The heating tube is provided with water inlets and drains on the end sides opposite to each other in the longitudinal direction, so that the liquid passing through the inside of the heating tube flows in a straight line adjacent to the first and second heating bodies.

First and second inlets are provided at the lower end of the heating vessel, a drain is provided at the upper end of the heating vessel, and the first inlet allows the liquid to flow into the inner space of the first heating body, and the second inlet. The liquid is introduced into the space between the second heating body and the side wall of the heating vessel.

First and second inlets are provided at an upper end of the heating tube, a drain hole is provided at a lower end of the heating tube, and the first inlet port allows liquid to flow into an inner space of the first heating body, and the second inlet port. The liquid is introduced into the space between the second heating body and the side wall of the heating vessel.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing an electric boiler of the high frequency induction heating method of the present invention.

As shown, the electric boiler of the present invention is disposed separately inside and outside the heating vessel 10, one or more induction coils 21, 22 and the induction coils 21, 22 provided in the heating vessel 10. First and second heating bodies 31 and 32 are included.

The heating vessel 10 has spaces 15a and 15b through which a liquid such as water may be accommodated or flow therein, and may have a circular or rectangular cross section on a plane.

The induction coils 21 and 22 are arranged in the heating cylinder 10, and the induction coils 21 and 22 are connected with a high frequency current supply unit 25 for supplying a high frequency current.

The first heating element 31 is installed on the inner surfaces of the induction coils 21 and 22 to be spaced apart at predetermined intervals from the inner diameter surfaces of the induction coils 21 and 22. When a high frequency current is applied from the high frequency current supply unit 25 to the induction coils 21 and 22, a high frequency magnetic field is formed in the induction coils 21 and 22, and the high frequency magnetic field is applied to the inner circumferential surfaces of the induction coils 21 and 22. The adjacent first heating body 31 is heated by the loss of eddy current (eddy current) or the hysteresis loss to heat the liquid passing through the inner space of the first heating body 31.

The second heating body 32 is installed on the outer surfaces of the induction coils 21 and 22 to be spaced apart from the outer diameter surfaces of the induction coils 21 and 22 at predetermined intervals. Similarly, when a high frequency current is applied to the induction coils 21 and 22 from the high frequency current supply unit 25, a high frequency magnetic field is formed in the induction coils 21 and 22, and the induction coils 21 and 22 On the side of the second heating body 32 adjacent to the outer circumferential surface, heat is generated by loss of eddy current (eddy current) or hysteresis loss to heat the liquid passing through the inner space of the second heating body 32.

As described above, the present invention makes the liquid in the heating tube 10 more uniform by the first and second heating bodies 31 and 32 disposed in the inner and outer sides of the induction coils 21 and 22, that is, in a double tube structure. By heating rapidly over a wide range, the heating efficiency is greatly increased. That is, the present invention has the advantage of enhancing the heating efficiency by greatly expanding the heating area.

In addition, as shown in FIG. 1, at least two induction coils 21 and 22 are disposed in the longitudinal direction of the heating tube 10, and each induction coil 21 and 22 is a high frequency current supply unit 25. It is connected in parallel to the side.

In the multiple induction coils 21 and 22 of the present invention, the combined capacity of the inductance is calculated by the parallel connection structure, and when the combined capacity of the calculated inductance is set equal to the inductance when a single induction coil is installed. The number of turns of each of the induction coils 21 and 22 can be greatly increased, so that the heat generating area by the induction coils 21 and 22 is increased. Here, the case where a single induction coil is installed and the multiple induction coils 21 and 22 of the present invention are assumed to have the same thickness of each coil, and the number of turns of each induction coil 21 and 22 is the same.

As a result, in the present invention, the induction calorific value can be increased by interposing multiple induction coils 21 and 22 connected in parallel between the first and second heating bodies 31 and 32.

The induction coils 21 and 22 are provided with bobbins 23 and 24 of a heat resistant material on the inner and outer circumferential surfaces thereof, and the bobbins 23 and 24 are made of a heat resistant material such as ceramics and the like. It is possible to block the heat transfer from the (31, 32) to the induction coil (21, 22) side.

2 to 4 are cross-sectional views showing the electric boiler of the high frequency induction heating method according to the first embodiment of the present invention.

In the electric boiler according to the first embodiment of the present invention, the lower ends of the first and second heating bodies 31 and 32 are fixedly coupled to the lower end 10a of the heating vessel 10, and the lower end of the heating vessel 10 ( First and second inlets 12 and 13 are provided at 10a, and a drain 11 for discharging the heated liquid is provided at the upper end 10b of the heating vessel 10.

The lower end portions of the first and second heating elements 31 and 32 are fixedly coupled to the lower end portion 10a of the heating tube 10 by welding or the like, and the upper end portions of the first and second heating elements 31 and 32 are sealed. As the member 33 is fixedly coupled by welding or the like, the space between the first and second heating bodies 31 and 32 (that is, the space in which the induction coils 21 and 22 are installed) is accommodated in the heating cylinder 10. It is sealed to the spaces 15a and 15b.

The first and second heating bodies 31 and 32 are annularly disposed on the inner side and the outer side of the induction coils 21 and 22, as shown in FIG. 3.

The liquid is introduced into the heating tube 10 through the first inlet 12 provided at the lower end 10a, and the liquid introduced through the first inlet 12 is the inner surface of the first heating body 31. It may pass through the first space (15a) formed in or temporarily stored.

In addition, the lower end portion 10a of the heating tube 10 may be provided with a second inlet 13 as shown in FIGS. 2 and 4, and the liquid is supplied to the second heating body through the second inlet 13. 32 flows into the second space 15b formed between the side wall 10c of the heating vessel 10 and flows to the drain port 11 so that the flow of the liquid is more smoothly, and the heating efficiency is improved by the smooth flow of the liquid. This is further increased.

In addition, in the present invention, the water inlets 12 and 13 and the drain holes 11 are separately provided on the end sides facing each other in the longitudinal direction of the heating tube 10 so that the liquid is spaces 15a and 15b in the heating tube 10. When passing through, it is possible to induce a straight flow adjacent to the first and second heating bodies 31 and 32, thereby allowing the liquid to be transferred by the first and second heating bodies 31 and 32. Heating can be done more quickly and uniformly.

Meanwhile, the liquid heated by the first and second heating elements 31 and 32 may be discharged through a water pipe connected to the drain port 11 and sent to the heating water pipe to be used as heating water or hot water.

Figure 5 shows an electric boiler of the high frequency induction heating method according to a second embodiment of the present invention.

As shown, the electric boiler according to the second embodiment includes first and second inlets 12 and 13 at the upper end 10b of the heating vessel 10, and the lower end 10a of the heating vessel 10. ) Is provided with a drain 11, characterized in that the upper end of the first and second heating elements (31, 32) is fixedly coupled to the upper end (10b) of the heating tube (10).

In the second embodiment, the first and second water inlets 12 and 13 are provided at the upper end of the heating vessel 10 so that the liquid flows from the upper portion of the heating vessel 10 to the lower portion of the heating vessel 10. It is possible to minimize the generation of bubbles in the liquid heated by 31, 32).

Since the rest of the configuration and operation is similar or identical to the preceding embodiment, detailed description thereof will be omitted.

The present invention as described above, by significantly increasing the total heating area heated by the high frequency induction heating, there is an effect that can be more uniformly and quickly transfer the heat to be transferred into the heating vessel and significantly increase the heating efficiency.

In addition, the present invention has the advantage that can guide the flow of the liquid in a straight direction to smooth the flow of the liquid, and further improve the heating efficiency of the liquid.

In addition, the present invention has a feature that can prevent the bubbles generated during the heating of the liquid passing through the inside of the heating tube by the high-frequency induction heating.

Claims (6)

A heating tube through which an inlet and a drain are provided to form a space therein and the liquid is obtained and drained; A tubular second heating element disposed therein at intervals from an inner circumferential surface of the heating tube; A tubular first heating body disposed therein at intervals from an inner circumferential surface of the second heating body; An induction coil which is a heating element provided between the second heating body and the first heating body; Electric boiler of high frequency induction heating method characterized in that it comprises a. The method of claim 1, The induction coil is an electric boiler of the high frequency induction heating method, characterized in that two or more induction coils are connected in parallel between the first and second heating elements in the longitudinal direction of the heating tube. The method according to claim 1 or 2, The induction coil is an electric boiler of the high frequency induction heating method, characterized in that the inner circumferential surface and the outer circumferential surface provided with a bobbin of a heat-resistant material. The method of claim 3, The heating tube is provided with water inlets and drains on the end sides facing each other in the longitudinal direction, respectively, so that the liquid passing through the interior of the heating tube flows in a straight line adjacent to the first and second heating elements. Heated electric boiler. The method of claim 4, wherein First and second inlets are provided at the lower end of the heating vessel, a drain is provided at the upper end of the heating vessel, and the first inlet allows the liquid to flow into the inner space of the first heating body, and the second inlet. The electric boiler of the high frequency induction heating method characterized in that the liquid flows into the space between the second heating body and the side wall of the heating tube. The method of claim 4, wherein First and second inlets are provided at an upper end of the heating tube, a drain hole is provided at a lower end of the heating tube, and the first inlet port allows liquid to flow into an inner space of the first heating body, and the second inlet port. The electric boiler of the high frequency induction heating method characterized in that the liquid flows into the space between the second heating body and the side wall of the heating tube.

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