KR20070081242A - Induction heating element for heater and heater thereof - Google Patents

Abstract

An induction heating element and the heater are provided to improve a thermal conversion efficiency of a conductor by increasing a contact area between the heating element and air. An induction heating element includes a high frequency power generator(30), an induction coil(20), and a hollow conductive tube(11). The hollow conductive tube is made of a metal, a magnetic material, or an alloy thereof inside the induction coil. The power generator is connected to the induction coil. When a high frequency current flows in the induction coil, an induction current is generated on a surface of the conductive tube, and the conductive tube is heated by the induction current. The conductive tube is made of a material with a high heat conductivity or high permeability.

Description

Induction heating element for electric hot air heater and hot air fan using the same {INDUCTION HEATING ELEMENT FOR HEATER AND HEATER THEREOF}

1 is an illustration of an electric warmer using an induction heating element according to the present invention.

2 is a perspective view of an induction heating element for an electric warmer of a first embodiment according to the present invention;

3 is a perspective view of an induction heating element for an electric warmer of a second embodiment according to the present invention;

4 is a perspective view of an induction heating element for an electric warmer of a third embodiment according to the present invention;

5 is a perspective view of an induction heating element for an electric warmer of a fourth embodiment according to the present invention;

6 is a perspective view of an induction heating element for an electric warmer of a fifth embodiment according to the present invention;

7 is a perspective view of an induction heating element for an electric warmer of a sixth embodiment according to the present invention;

8 is a perspective view of an induction heating element for an electric warmer of a seventh embodiment according to the present invention;

9 is a perspective view of an induction heating element for an electric warmer of an eighth embodiment of the present invention;

10 is a perspective view of an induction heating element for an electric hot air fan having a blade of a rotating form according to the present invention;

<Explanation of symbols for the main parts of the drawings>

11, 12, 14, 15: conductor tube 13: inner conductor tube

16: outer tube 20, 21: guide coil

30: high frequency power generating unit 40: bundle of induction heating heating element

50: blower 60: magnetic material for magnetic flux induction

71,72,73: conductor plate 74: outer conductor plate

80: Rotating wing (number 13 overlapping) 90: Cold air

91: hot air 92: air inlet

100: electric hot air fan

According to the present invention, when a high frequency magnetic field generated by an induction coil is applied to a nearby conductor, an induced eddy current is generated on the surface of the conductor, and thus the surface of the conductor is heated. The present invention relates to an induction heating element for an electric warmer that warms air by using an induction heating effect and a warmer using the same.

As income levels improve, consumers demand more comfortable and clean indoor environments in the winter. Therefore, interest in electric hot air heaters, which are much more comfortable than conventional hot air fans that consume oxygen and generate combustion gas by using oil or gas as fuel, has been greatly increased.

Conventional electric heaters use joule heating, which is generated by directly flowing current to a resistor, such as a heating element using nichrome wire, a ceramic heating element using a resistance of a thin metal film on a ceramic surface, or a carbon heating element using a carbon resistance. The room temperature is adjusted by heating the air.

However, the conventional general electric hot air heater has a disadvantage in that the heat supply capacity and energy efficiency of the hot air heater is very low due to the small contact area and heat conductivity of the heating element and air, and thus it is mainly used for non-home use because it requires a large power consumption.

However, as the income level increases recently, the demand for a comfortable indoor environment is rapidly increasing, and thus, a power-saving electric hot air fan using an improved ceramic heating element or heat pipe (HEAT-PIPE) is gradually being distributed to homes. However, it is still required to pay more power bills than gas heaters or fan heaters.

However, the advantages of electric heaters are that they can be used as easy-to-manage wall mounts, have a low risk of accidents, can be heated quickly, and they do not consume oxygen when they generate heat, thus maintaining a pleasant and fresh interior.

The present invention provides the energy-saving induction heating element to heat the air by using induction heating, which is different from the heating method of the existing heating fan, while still having the advantages of the above-described existing electric heating fan. For the purpose of Induction heating heating element using induction heating has a high thermal conductivity as the heating plate itself, unlike the heating element for electric heaters, so the thermal conversion efficiency is very good and there is no need to continuously supply electric power to maintain the constant temperature of the induction heating element. Power consumption can be reduced compared to conventional electric heaters. In addition, the induction heating element can quickly heat the air, it is easy to widen the contact area between the air and the heating element is good heat supply capacity, thereby making it possible to manufacture an electric heater.

In order to achieve the object as described above, the present invention provides an induction heating element for an electric hot air fan,

As a heating element for an electric hot air fan,

The hollow conductor tube is a solenoid induction coil wound around its outer circumferential surface, and the induction coil is provided with a high frequency current by a high frequency power generating unit, forcing air through the conductor tube to heat air. It may be.

In order to increase the contact area between the air and the heating element, one or more inner conductor tubes of different diameters may be overlapped with each other in the conductor tube.

An outer tube may be further included between the conductive tube and the induction coil, and the outer tube may be an insulator.

The conductor tube may be formed by gathering a plurality of conductor tubes facing each other side by side.

The outer coil may further include an outer tube and move the air between the outer tube and the conductor tube as well as inside the conductor tube to heat the air.

Further comprising an outer tube on the outside of the conductor tube and the induction coil, the conductor tube is full in its core form, it may be to move the air between the outer tube and the conductor tube to heat the air.

The material of the magnetic material for magnetic flux induction having a high permeability may be connected to both ends of the conductor tube, and the material is connected to the outside by wrapping the induction coil.

Further comprising a blower for moving the air into the inlet of the conductive pipe, it may be a bundle including one or more heating elements for the electric warmer.

It may further include a shim having a wing shape in order to widen the contact area of the air in the innermost inner tube or the inner tube.

A wing portion may be formed on the surface of the conductor tube or the inner conductor tube to widen the area of contact with the air on the outer or inner circumference of the conductor tube or the inner conductor tube.

A high frequency current is supplied to the induction coil and the induction coil wound between two conductor plates facing each other and the conductor plates and placed on a plane by a high frequency power generating unit, and the air is forcedly moved between the two conductor plates. It may be to heat.

As a heating element for an electric hot air fan,

Two conductor plates facing each other and an induction coil wound on a plane and placed outside the two conductor plates and the induction coil are supplied with a high frequency current by a high frequency power generator, forcing air to flow between the two conductor plates. And heating.

It may further include an outer conductor plate made of conductors spaced apart from each other at one or more regular intervals on the outside of the two conductor plates, and forcibly moving air to heat the outer conductor plates.

The two conductor plates and the outer conductor plates are connected to each other so that the side ends thereof are connected to each other, and the side plates are disposed so that air passes only between the two conductor plates and the outer conductor plates and the air does not leak to the side. It may be characterized in that it further comprises.

The plate which prevents air from leaking may be formed of a material of a magnetic material having a high permeability to form a magnetic path of the magnetic field.

It may further comprise a blower for blowing air between the two conductor plates and the outer conductor plate, including one or more heating elements for the electric warmer.

The conductor plate or tube heated by induction heating may be made of a material of high thermal conductivity metal or high magnetic permeability magnetic material or an alloy or coating of both to increase the heat conversion efficiency of the electric power.

The principle that the conductor is heated by induction heating means that when a high frequency current flows through the induction coil, the magnetic field generated by the induction coil penetrates into a nearby conductor and the surface of the skin at which the magnetic depth penetrates. Induction current flows to generate joule heating. More specifically, when a high frequency magnetic field is applied to the conductor, an induced current flows in the direction to counter the magnetic field on the surface of the conductor to satisfy the law of conservation of energy, thereby heating the surface of the conductor by its resistance. .

Induction heating has been actively used only as a heating method of the industrial heater for partial heating up to now, but the use area is rapidly expanding to an electric rice cooker and a heating method for cooking. Induction heating using induction heating is to adjust the room temperature appropriately by heating the cold air using a heating element.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. As shown in FIG. 1, the electric warmer 100 according to the present invention forcibly passes cold air 90 introduced through the air inlet 92 into the induction heating element bundle 40 using the blower 50. The air is heated and the heated hot air 91 is discharged to the outside through an outlet (not shown) located in the electric warmer 100. In this case, the induction heating element bundle 40 is induction heated by a high frequency current generated by the high frequency power generator 30. In addition, another air blower may be located at the air outlet for discharging the warmed air.

Induction heating heating element bundle 40 is composed of a heating element consisting of a bundle of one or more induction heating element heating.

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

(First embodiment)

Figure 2 is a perspective view showing an induction heating element for an electric hot air blower having a solenoid form according to the present invention.

As shown in FIG. 2, the solenoid type induction heating element has a hollow form of a high frequency power generator 30, an induction coil 20, and a metal or magnetic material or an alloy or coating thereof in the induction coil 20. It has a structure consisting of a conductor tube 11 of, the power generator 30 is connected to the induction coil 20 and the high frequency current generated by the power generator 30 flows in the induction coil 20 this current Induced current is generated on the surface of the conductive pipe 11 located in the induction coil 20 in a reaction to prevent the conductive wire 11 is heated by the induced current. As the material of the conductive pipe 11, a metal having a large thermal conductivity and a magnetic material having a high permeability or a conductor made of an alloy or a coating of the two may be used to increase the thermal conversion efficiency by the power of the heating element.

As shown in FIG. 2, the conductive pipe 11 heated by a high frequency magnetic field has a hollow pipe shape, and cold air 90 is introduced into the heated conductive pipe 11 using a blower 50. Force the air through to regulate the temperature by heating the air.

When a conductor having a high thermal conductivity is used as the material of the heated conductor tube 11, heat conversion efficiency can be greatly increased, and power is continuously supplied to the conductor tube 11 to maintain a constant temperature of the conductor tube 11. There is no need to supply, and heat is generated in the conductor pipe 11 which serves as a heat generating plate, so it is highly efficient in terms of power. In addition, in order to increase the amount of heat supplied to the electric heater 100 using the induction heating element, the length of the induction coil 20 and the conductor pipe 11 can be increased to easily increase the heat generation area, and thus the size of the entire heater is also easy. Can be reduced.

When a conductor having a large thermal conductivity is used in the conductive pipe 11, which is a heated portion of the induction heating element, the heat loss rate can be greatly reduced, thereby reducing the power consumption of the hot air fan. For example, an aluminum pan with a low heat loss rate can be easily seen even when the same cooking effect can be obtained under the same conditions with about 25% less energy than an iron pan with a high heat loss rate. In addition, the induction heating (IH) electric rice cooker currently on the market reduces the cooking time under the same conditions by using brass with good thermal conductivity instead of stainless steel.

In the following, all the figures presented are exaggerated and drawn induction coils 20 and 21 for convenience.

(2nd Example)

3 is a structure in which a thin circular inner conductor tube 13 having a small diameter is inserted into a large and thin circular conductor tube 12, respectively, in order to increase the heating area between air and the heated conductor tube. 12) and the cold air 90 through the inside of the inner conductor pipe 13 is forcibly heated. In this case, the conductor tube 12 and the inner conductor tube 13 are conductors. The reason why the conductor tubes 12 and 13 should be thin is that heat is generated only at the surface of the conductor having a depth in which the magnetic field generated by the induction coil 20 penetrates into the surface of the good conductor. This is called the skin depth, and the skin depth of the good is determined by the following equation.

는 전류의 주파수,

는 도체의 전도율,

는 도체의 투자율, 그리고

는 3.141592 이다. 일반적으로 자성체가 아닌 금속의 투자율은 공기 중의 투자율과 거의 같다. here

Is the frequency of current,

Is the conductivity of the conductor,

Is the permeability of the conductor, and

Is 3.141592 In general, the magnetic permeability of non-magnetic metals is about the same as that of air.

Either using one conductor tube 11 as the induction heating element or a structure in which inner conductor tubes of several conductors of different diameters are arranged around a certain axis in the conductor tube, in which case the conductor and the total thickness of the same material If they are equal, they are heated to the same depth in both cases. However, when there are inner conductor tubes composed of the latter layers of conductors, the heating area between the air and the tubes is greatly increased, and thus, there may be better heat conversion efficiency when there are several layers of inner conductor tubes. In other words, the heat conversion efficiency may be better when the conductor tube and the inner conductor tube are made thin so that the tubes of several layers of conductors overlap. In the case of FIG. 3, one inner conductor tube 13 overlaps with respect to a certain axis in the conductor tube 12, but one or more inner conductor tubes may overlap.

In addition, an outer tube of the insulator may be further included between the conductor tube and the induction coil.

(Third Embodiment)

The conductive tube 14 heated as shown in FIG. 4 has a rectangular shape in which several holes are drilled, and is heated by forcibly passing air into the empty space of the heated conductive tube 14.

(Example 4)

As shown in FIG. 5, there is an outer tube 16 for inducing air outside the induction coil 20, and there is a conductor tube 15 heated in the induction coil, and the heated conductor tube 15 and the outer tube ( The air is forced to pass through the space between 16) and heated. The conductor tube 15 may have a hollow pipe or a hollow core shape.

(Example 5)

In the case of the induction heating element of the solenoid type as shown in FIG. 6, the magnetic field generated by the induction coil forms a magnetic flux path to prevent the leakage of magnetic flux. It is connected to both ends of the) and this material has a structure surrounding the outside of the induction coil 20 is connected to each other wrapped. Thereby, the heat generation efficiency of the conductor pipe 11 can be improved.

(Example 6)

7 is a perspective view showing an induction heating element for an electric hot air heater in which the induction coil 21 according to the present invention is wound in a flat plate shape.

FIG. 7 shows two conductor plates 71 and 72 made of a magnetic material having a high permeability and a metal having a high thermal conductivity or an alloy or a coating of the two and an induction coil 21 in a constant plane between the two conductor plates. And the high frequency power generator 30 is connected to the induction coil 21. When the high frequency current generated from the high frequency power circuit 30 flows through the induction coil 21, the two conductor plates 71 and 72 are formed. Heated to force air through the two conductor plates.

(Example 7)

As shown in FIG. 8, two conductive plates 71 and 73 are heated, and an induction coil 21 is disposed outside the two conductive plates 71 and 73, and a high frequency power generator 30 is formed in the induction coil 21. Is connected to and in this case, the air is forced through the two conductor plates 71 and 73 to heat the air.

(Example 8)

As shown in Fig. 9, the two conductor plates 71 and 72 can use a thin conductor plate as in the second embodiment, so that the outside of the conductor plates 71 and 72 are separated by one or more regular intervals, respectively. It further includes a conductor plate 74, the air can also be heated between the outer conductor plate 74 to heat the air.

In addition, in the sixth embodiment and the seventh embodiment, the sides of the two conductive plates may be further connected to each other so that the sides thereof are connected to each other and face each other, and the air passes only between the two plates. These plates may also be a material of magnetic material for magnetic flux induction, which forms a magnetic field path of the magnetic field to prevent leakage of magnetic flux.

In addition, in all embodiments, a suitable structure may be added to increase the contact area of the conductor and the air, which is the portion to be heated. For example, in the case of FIG. 2, a hollow tube or a hollow core made of metal having a blade having a rotating shape may be inserted into the conductive tube 11 to increase the contact area between the heating element and the air. This is shown in Figure 10, and as shown in Figure 10 may further include a rotary blade 80 of the rotation type in the innermost tube. In addition, in all embodiments, a rotor blade may be added to the inner or outer surface of the conductor to increase the contact area between the air and the heating element.

In all embodiments, the conductors heated by induction heating may increase the heat conversion efficiency of the heating element by using a metal having a high thermal conductivity and a magnetic material having a high permeability or a conductor made of an alloy or a coating of the two.

In all embodiments, the induction heating element bundle 40 may be composed of a heating element consisting of a bundle of one or more induction heating element.

As mentioned above, although the preferred embodiment of the present invention has been described in detail, the scope of the present invention is not limited to the specific embodiment and should be interpreted by the appended claims. In addition, those skilled in the art should understand that many modifications and variations are possible without departing from the scope of the present invention.

As described above, the induction heating element according to the present invention uses induction heating as a heating method, and unlike the case of nichrome wire, which is a heating element of the conventional electric warmer, a conductor having a high thermal conductivity is used as the heating plate, and thus the thermal conversion efficiency is very good. In addition, it is not necessary to continuously supply power to keep the temperature of the heating plate constant, and when a conductor having a large permeability and a large thermal conductivity is used as a material of the induction heating element, power consumption can be greatly reduced than that of the existing electric heater.

In addition, induction heating elements can heat conductors at a desired temperature immediately after electricity is applied, and the contact area between induction heating elements and air can be easily enlarged, so the heat supply capacity is good, thereby reducing the size of the electric heater.

In addition, since the induction heating element uses electricity, it does not consume oxygen, which is an advantage of the existing electric heater, and does not generate combustion gas, thereby maintaining comfortable and clean indoor air. Conventional induction coil heating element has a strong characteristic against failure because there is little fear that the induction coil short circuit or open circuit, unlike the case of the conventional nichrome wire.

Claims (17)

As a heating element for an electric hot air fan, The hollow conductor tube is a solenoid induction coil wound around its outer circumferential surface, and the induction coil is provided with a high frequency current by a high frequency power generating unit, forcing air through the conductor tube to heat air. Induction heating element for electric hot air fan. The induction heating apparatus of claim 1, wherein one or more inner conductor tubes having different diameters are overlapped with each other about a certain axis in order to increase the contact area between air and the heating element. Heating element. The induction heating element of claim 2, wherein an outer tube is further included between the conductor tube and the induction coil, and the outer tube is an insulator. The induction heating element of claim 1, wherein the conductive pipes are formed of a plurality of conductive pipes facing each other side by side. The induction for electric warmer of claim 1, further comprising an outer tube outside the induction coil and heating the air by moving air not only in the conductor tube but also between the outer tube and the conductor tube. Heating heating element. The method of claim 1, further comprising an outer tube on the outside of the conductor tube and the induction coil, the conductor tube is filled in the core form of the core, and moves the air between the outer tube and the conductor tube to heat the air A heating element for an electric warmer, characterized in that. The material of any one of claims 1 to 6, wherein a material of magnetic material for magnetic flux induction having a high permeability is connected to both ends of the conductor tube, and the material is connected to the outside by surrounding the induction coil. Induction heating heating element for an electric hot air fan. The electric hot air blower according to any one of claims 1 to 6, further comprising a blower for moving air into the inlet of the conductive pipe, and comprising one or more heating elements for the electric hot air blower. . The method according to any one of claims 1 to 5, characterized in that it further comprises a wing-shaped shim in order to increase the contact area of the air in the innermost of the conductor tube or the inner conductor tube. Heating element for electric hot air fan. 7. The electric hot air blower according to any one of claims 1 to 6, wherein wings are formed on the surface of the conductor pipe or the inner conductor pipe to extend the area of contact with the air. Induction heating element. As a heating element for an electric hot air fan, A high frequency current is supplied to the induction coil and the induction coil wound between two conductor plates facing each other and the conductor plates and placed on a plane by a high frequency power generating unit, and the air is forcedly moved between the two conductor plates. Induction heating element for an electric warmer, characterized in that the heating. As a heating element for an electric hot air fan, Two conductor plates facing each other and an induction coil wound on a plane and placed outside the two conductor plates and the induction coil are supplied with a high frequency current by a high frequency power generator, forcing air to flow between the two conductor plates. Induction heating element for an electric warmer, characterized in that the heating. 13. The apparatus of claim 11 or 12, further comprising an outer conductor plate of conductors spaced apart from each other by one or more regular intervals on the outside of the two conductor plates, and forcibly moving air to heat the outer conductor plates. Induction heating heating element for an electric hot air blower. The method according to any one of claims 11 to 13, wherein the two conductor plates and the outer conductor plates face each other with their side ends connected to each other, and only between the two conductor plates and the outer conductor plates. Induction heating element for an electric warmer, characterized in that it further comprises a side plate so that the air passes through the side. 15. The induction heating element according to claim 14, wherein the plate which prevents air from leaking is made of a material of magnetic material having a high permeability to form a magnetic path of the magnetic field. According to any one of claims 11 to 13, further comprising a blower for blowing air between the two conductor plates and the outer conductor plate, characterized in that the bundle comprising at least one heating element for the electric heater. Electric heater. The plate or tube of any one of claims 1 to 6 and 11 to 13, wherein the conductor or plate is heated by induction heating is made of a high thermal conductivity metal or high in order to increase the heat conversion efficiency of electric power. An induction heating element for an electric hot air blower, characterized in that it is made of a magnetic material of magnetic permeability or an alloy or coating of both.

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