KR20100026410A - A high frequency cable for a high frequency induction heating device - Google Patents

Abstract

PURPOSE: A high frequency cable for a high frequency induction heater with high power is provided to improve capacitance by increasing a contact area between an input wire and an output wire. CONSTITUTION: A high frequency cable includes a plurality of input wires and output wires. The input wire and the output wire are covered with an insulation sheath. One end(1) of the high frequency cable is connected to the high frequency power source. The other end(3) of the high frequency cable is connected to the current converter of the high frequency induction heater with high power. The other end of the high frequency cable is comprised of an input wire bundle part(A) and an output wire bundle part(B).

Description

High frequency cable for large power high frequency induction heating device {A HIGH FREQUENCY CABLE FOR A HIGH FREQUENCY INDUCTION HEATING DEVICE}

This document relates to a high power high frequency cable, and more particularly, to a high frequency cable that can be used in a high frequency induction heating apparatus capable of providing a high power high frequency current to a heating coil through a single current power conversion.

1 shows a block diagram of a conventional large power high frequency induction heating apparatus.

The high frequency induction heating apparatus shown in FIG. 1 includes an external power source, a heating base, a current converter (CT-BOX), and a heating coil. The heating base is an inverter that generates heating power and receives an AC power source to generate a frequency suitable for induction heating. That is, a large power high frequency power is generated through the primary transformer. In addition, the current converter makes the connection between the heating base and the heating coil flexible and improves efficiency through the secondary transformer. And the induction heating is made by supplying the secondary transformed current to the heating coil.

According to such a high-power high-frequency induction heating device, there is a problem that the size of the device is increased by the first transformer and the second transformer in the heating base and the current converter, respectively. Then, the primary transformed current from the heating base is supplied to the current converter so that a large power flows between the two components. Therefore, the cable configuration connecting the heating base and the current converter also has a problem that it is difficult to miniaturize.

This document can be used in high frequency induction heating devices that can provide high-frequency high-frequency current generated after one time of power conversion and resonance to the heating coil through the high frequency transformer and resonance high frequency capacitor included in the current converter connected to the heating coil. The problem to be provided is a high frequency cable.

A high frequency cable for a large power high frequency induction heating apparatus as one means for solving the above problems includes a plurality of input wires and a plurality of output wires, each input wire of the plurality of input wires and each of the plurality of output wires The output wire is characterized by being wrapped in an outer sheath of an insulating material.

One end of the high-frequency cable may be configured to be one cable close to the maximum in a state where the plurality of input wires and the plurality of output wires are cross-mixed with each other.

The other end of the high frequency cable, the plurality of input wires and the plurality of output wires may be divided into different cables.

The high frequency cable may connect a high frequency power source and a large power high frequency induction heating apparatus.

The large power high frequency induction heating apparatus may include a high frequency transformer configured to convert a high frequency AC current input from the high frequency power source into a large power high frequency current through a primary coil and a secondary coil.

The high power high frequency induction heating apparatus may include a resonance high frequency capacitor having a capacitance value C for generating a resonance phenomenon with respect to the high power high frequency current.

The high power high frequency induction heating apparatus may include a heating coil in which thermal energy is generated by an induced current generated by a high frequency magnetic field induced from the high power high frequency current.

The high frequency transformer and the resonant high frequency capacitor may be mounted in one current converter.

According to the present invention, there is an effect that can drive a large power high frequency heating apparatus through one large power high frequency conversion.

In addition, it is possible to reduce the power loss by miniaturizing the size of the large power high frequency heating device and reducing the number of power conversion and simplifying the moving path.

In addition, there is an effect that can provide a stable large power high frequency current as a heating coil through a high frequency capacitor for resonance inducing a resonance phenomenon for the high frequency converted current in the current converter.

In addition, by attaching a cooling plate to a heat generating device such as a high frequency converter, there is an effect that can cool the generated heat without greatly increasing the size of the equipment.

In addition, by converting to a large power in the current converter to which the heating coil is connected, relatively small power flows between the high frequency power supply and the current converter, thereby simplifying and miniaturizing the high frequency cable configuration.

Hereinafter, embodiments of the present invention for a high frequency cable for a large power high frequency induction heating apparatus will be described in more detail. First, a high frequency induction heating apparatus in which a high frequency cable according to the present invention can be used will be described.

Figure 2 shows a block diagram of a large power high frequency induction heating apparatus according to an embodiment of the present invention, Figure 3 shows a simplified circuit configuration of a large power high frequency induction heating apparatus according to an embodiment of the present invention.

According to the high frequency induction heating method, a high frequency magnetic field is generated by flowing a high frequency current through a heating coil by using an electromagnetic induction so that an induced current flows in a heating material within the high frequency magnetic field. This induced current generates the loss caused by the eddy current flowing by swirling the current in the object, and Joule heat due to the hysteresis loss, and generates heat in a very short time. The heating using the high frequency current to generate heat is called high frequency induction heating.

According to the high frequency induction heating method, because the high frequency current with high frequency is used, the magnetic flux and eddy current are concentrated on the surface layer of the object by the skin action and proximity effect of the current, and the heat loss (eddy current loss, hysteresis loss) generated at this time is The surface layer of water is heated. With this principle, productivity and workability are high because efficient rapid heating is possible by concentrating energy on necessary parts of the object to be heated.

Important is the heating efficiency, which is proportional to the coil current and the number of turns of the coil, and is proportional to the square root of frequency, effective permeability, and resistivity. Therefore, if the frequency is high, the heating efficiency is high, but only the surface is heated by the skin effect, so it may be necessary to lower the frequency when heating thick objects.

Referring to FIG. 2, a large power high frequency induction heating apparatus according to an exemplary embodiment of the present invention includes a high frequency power source 20, a high frequency transformer 30, a high frequency capacitor 40 for resonance, and a heating coil 60. In addition, the high frequency transformer 30 and the resonant high frequency capacitor 40 may be configured to be included in one current converter 50 to which the heating coil 60 is connected as shown in FIG. 2.

The high frequency transformer 30 according to the present embodiment is composed of a common iron core with a plurality of coils, and when an alternating voltage is applied to one coil, a voltage conversion device induces a voltage proportional to the turn ratio to the other coil by an electromagnetic induction phenomenon. That is, as shown in FIG. 3, the high frequency input current is supplied from the primary coil 31 corresponding to the current input line and connected to the high frequency power supply 20, and the secondary coil 32 corresponding to the current output line. The high frequency AC current input from the high frequency power source 20 is converted into a large power high frequency current and output.

The resonance high frequency capacitor 40 according to the present embodiment may be configured such that the resonance high frequency capacitor 40 is included in the high frequency transformer 30 and one current converter 50 as shown in FIG. 2. And, it is connected to the secondary coil 32 of the high frequency transformer 30, and configured to have a capacitance value (C) that can generate a resonance phenomenon for the input high power high frequency current.

The heating coil 60 according to the present embodiment is connected to the high frequency condenser 40 for resonance, an induction current is generated by a high frequency magnetic field derived from a high power high frequency current, and heat energy is generated by the induction current, thereby heating device. It becomes available.

In order for the heating coil 60 to transfer the maximum energy to the load, a coil should be installed as close as possible to the portion to be heated so that many magnetic lines cross each other to obtain a high magnetic flux density and a large amount of current is induced. In addition, it is preferable that the heating coil 60 does not cancel the magnetic lines of force by induction from the opposite side, and the coil direction is designed to be constant.

The heating coil 60 used for high frequency heating is not uniform in shape and size, and may be designed in various forms in consideration of the above-described design criteria. The cross section of the heating coil is circular, ellipse, square, etc. In particular, the elliptical shape is more effective when used as a heating coil because the coil value can be adjusted by adjusting the height of the coil, and the convenience of avoiding when the structure is limited.

4 illustrates an external configuration of a high power high frequency induction heating apparatus according to an embodiment of the present invention, and FIG. 5 illustrates an internal configuration of a high power high frequency induction heating apparatus according to an embodiment of the present invention.

4 shows a current converter 50 and a heating coil 60 according to the present embodiment. As shown in FIG. 5, the current converter 50 according to the present embodiment includes a high frequency transformer 30 and a high frequency capacitor 40 for resonance. In addition, the heating coil 60 according to the present embodiment is configured to protrude out of the current converter 50 to transfer heat to the heated object, and the heating coil 60 is a high frequency capacitor for resonance in the current converter 50. It is preferred to be connected to 40.

When power is applied from the high frequency power source 20 generating the high frequency current through the primary coil L1 31 of the high frequency transformer 30, the appropriate high power high frequency current is 2 according to the winding ratio L1: L2 of the high frequency transformer 30. It is generated in the secondary coil L2 32 and flows along the current supply line to the heating coil 60.

This high-power high-frequency current flows along the heating coil 60 to form a magnetic field around it. At this time, the heating element changes the magnetic field formed around the heating coil 60 to generate an induction current in the heating element. Done. The induced current flows through a predetermined section of the heating object having inherent electrical resistance to generate Joule heat in this portion, thereby heating the heating object.

In addition, the current converter 50 according to the present embodiment has a coolant inlet tube 70 for introducing coolant into the current converter 50 and a coolant outlet tube 72 and a coolant inlet tube 70 for discharging the used coolant. Through the cooling water introduced through the high frequency transformer 30 and the high frequency condenser 40 for resonance and / or the heat generated in the heating coil 60 may be cooled.

In addition, in the high frequency transformer 30 and / or the resonant high frequency capacitor 40, a cooling plate 76 may be mounted to allow the cooling water to flow over a large area. In addition, the cooling plate 76 may further include a cooling port 74 for introducing the cooling water into the cooling plate 76. The coolant inlet pipe 70 and the coolant outlet pipe 72 may be connected to a coolant circulation device provided separately to circulate the coolant continuously.

The coolant supplied from the external coolant circulator through the coolant inlet pipe 70 flows into the secondary current output line 32 and the current supply line conduit, and thus the secondary water output line 32 and the current flow due to the high frequency current flowing therethrough. It can cool the heat generated from the supply line. In addition, since the temperature of the heating coil 60 rises not only by self-heating by high frequency current flowing through itself, but also by heat transfer from the heated object, the cooling water circulates inside the heating coil 60 to cool it. It may be.

In addition, the internal circulation prevention film is formed inside the cooling plate 76 of the high frequency transformer 30 and / or the high frequency condenser 40 for resonating, thereby allowing the coolant and the coolant outlet tube 72 to flow through the coolant inlet tube 70. By allowing the coolant discharged through to be separated, it is possible to prevent the coolant from circulating in the current converter 50 without passing through the coolant circulator. This inner circulation prevention film is preferably disposed between the position where the coolant inlet pipe 70 and the coolant outlet pipe 72 are attached.

The cooling plate 76 according to the present embodiment is preferably made of a material having excellent thermal conductivity, for example, copper, brass, etc., and a cooling water passage (not shown) is formed in the cooling plate 76 to coolant flowing into the cooling plate. May be configured to cool the heat while flowing along the cooling water channel. In this case, the cooling water may be embodied in various forms such as c-type, k-type, and d-type.

In addition, the cooling plate 76 may be configured in each of a plurality of to-be-cooled bodies, for example, the high frequency transformer 30 and / or the high frequency condenser 40 for resonance, or may be configured as one cooling plate 76. There will be. As the coupling member for coupling the cooling plate 76 and the object to be cooled, it may be preferable to use a member such as an elastic plate, for example, silicon, which can easily heat transfer and increase the adhesion rate.

6A to 6C illustrate a high frequency transformer configuration of a large power high frequency induction heating apparatus according to an embodiment of the present invention.

FIG. 6A illustrates an example in which the high frequency transformer 30 includes a plurality of cores formed in the form of EI coupling, and FIG. 6B illustrates an example in which a plurality of cores in the form of EE coupling is included, and FIG. 6C illustrates a UU. An example including a plurality of cores formed in a bonded form is shown. In order to strengthen the coupling between the E type and I type in FIG. 6A, the E type and E type in FIG. 6B, and the U type and U type in FIG. 6C, The fixing frame may be further mounted.

In addition, as described above, in order to cool the heat generated during the transformation process, the cooling plate 76 having the above-described cooling holes 80 may be coupled together. The cooling plate 76 may, in each embodiment, be mounted only at one end of the core or may be mounted at both ends. In this case, the cooling plate 76 may be mounted to perform the function of the above-described fixing frame, in which case the fixing frame configuration may be omitted.

The high frequency transformer 30 according to the present embodiment is connected to the high frequency power source 20 as shown in FIGS. 6A to 6C and the secondary coil corresponding to the primary coil 31 corresponding to the current input line and the current output line. It is made to include a coil 32 and operates so as to transform the winding ratio L1: L2 of the primary coil 31 and the secondary coil 32. Thus, it converts into a high power high frequency current and outputs it. The high frequency transformer 30 shown in FIGS. 6A to 6C is only one embodiment and may be configured in any form as long as it is a transformer capable of generating high frequency high frequency power, and is limited to the type shown in FIGS. 6A to 6C. It would be natural not to.

The high frequency transformer 30 according to the present embodiment may be configured as a transformer using an iron core. In general, iron core transformers are laminated with a steel sheet of about 0.35mm thickness, and coils are wound around the cores to be used as transformers. They are used in the general frequency band (about 50Hz to several hundred Hz). Iron core transformers have the advantage of easy to manufacture and repair with various core sizes and capacities and easy core separation, but they are bulky and heavy due to the low frequency band, and the high losses There are disadvantages.

In addition, the high frequency transformer 30 according to the present embodiment may be configured by using ferrite materials. Ferrite transformers form ferrite cores using materials called ferrites to produce ferrites cores. Frequency bands can be used in the range of several KHz to several tens of KHz. The ferrite transformer has a high frequency band and can be small in size compared to the capacity, which is light and has very low loss, thereby achieving high efficiency.

7 illustrates a cable connection configuration of a high power high frequency induction heating apparatus according to an embodiment of the present invention, and FIG. 8 illustrates a cable internal configuration of a high power high frequency induction heating apparatus according to an embodiment of the present invention.

7 illustrates a state in which the current converter 50 and the high frequency power supply 20 are connected through the high frequency cable 90. As shown in FIG. 7, the high frequency cable 90 according to the present embodiment is constituted by one cable. That is, the high frequency cable 90 according to the present embodiment has a wire flowing in a direction in which current flows into the current converter 50 (hereinafter referred to as an input wire) and a wire in which current flows in a direction flowing from the current converter 50. (Hereinafter referred to as an output wire) is configured to be included in one high frequency cable 90.

The high frequency cable 90 according to the present embodiment is configured such that a plurality of input wires and a plurality of output wires are included in the same cable. In addition, each input wire and each output wire should be configured to be insulated from other cables through a sheath, that is, a sheath.

 In addition, since the capacitance of the high frequency cable 90 has a property that is proportional to the contact area of the input wire and the output wire and inversely proportional to the square of the distance, it is advantageous that the contact area is wide and the distance is close. Therefore, it is preferable that the plurality of input wires and the plurality of output wires are configured to be included in the high frequency cable 90 in close contact with each other in a state where they are mixed alternately with each other.

In this way, the input wire and the output wire may be configured to be included in the same cable, according to the above-described embodiment, a large power transformer is performed in the current converter 50 in close proximity to the heating coil 60, so that a high frequency power source 20 It can be seen that because it is possible to transfer a relatively low voltage current toward the current converter 50 in the).

Referring to FIG. 8, the configuration of the high frequency cable 90 according to the present embodiment may be confirmed through the cut surface of the cable. More specifically, at one end (1-1`) connected to the high frequency power supply 20, a plurality of input wires 80 and a plurality of output wires 81 each wrapped with independent outer shells cross each other as described above. It is configured to be included in the high frequency cable 90 is in close contact with the mixed state.

In addition, the middle point of the high frequency cable 90 (2-2`) is divided into a portion consisting of a plurality of input wires 80 and a portion consisting of a plurality of output wires 81, and is connected to the current converter 50 At one end (3-3 '), the bundle portion A consisting of a plurality of input wires 80 and the bundle portion B consisting of a plurality of output wires 81 are divided and constituted with different cables.

When using a single high frequency cable as in the present embodiment, the contact area between the input wire and the output wire can be wider than the case where the input wire and the output wire are used respectively, and there is an advantage that a shorter distance can be realized. It will be possible to increase the capacitance of high frequency cables.

Although described above with reference to the drawings and embodiments, those skilled in the art that the present invention can be variously modified and changed within the scope without departing from the spirit of the invention described in the claims below I can understand.

1 shows a structural diagram of a conventional large power high frequency induction heating apparatus.

Figure 2 shows a block diagram of a large power high frequency induction heating apparatus according to an embodiment of the present invention.

Figure 3 shows a simplified circuit configuration of a large power high frequency induction heating apparatus according to an embodiment of the present invention.

Figure 4 shows an external configuration of a large power high frequency induction heating apparatus according to an embodiment of the present invention.

5 shows an internal configuration of a large power high frequency induction heating apparatus according to an embodiment of the present invention.

Figure 6 shows the configuration of a high frequency transformer of a high power high frequency induction heating apparatus according to an embodiment of the present invention.

7 shows a cable connection configuration of a large power high frequency induction heating apparatus according to an embodiment of the present invention.

Figure 8 shows the internal structure of the cable of the high power high frequency induction heating apparatus according to an embodiment of the present invention.

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

20: high frequency power supply 30: high frequency transformer

31: Primary coil 32: Secondary coil

40: high frequency capacitor for resonance 50: current converter

60: heating coil 76: cooling plate

90: high frequency cable

Claims (6)

A high power high frequency induction heating comprising a plurality of input wires and a plurality of output wires, each input wire of the plurality of input wires and each output wire of the plurality of output wires is wrapped in a sheath of an insulating material. High frequency cable for the device. The method according to claim 1, One end of the high-frequency cable, the plurality of input wires and the plurality of output wires are in close contact with each other in the state of maximum close contact is composed of a single cable, high-frequency cable for high-power high-frequency induction heating apparatus . The method according to claim 2, The other end of the high frequency cable is characterized in that the plurality of input wires and the plurality of output wires are divided into different cables, characterized in that the high-frequency high-frequency cable for high-frequency induction heating apparatus. The method according to claim 1, The high frequency cable is a high frequency high frequency induction heating device, characterized in that for connecting a high frequency power source and a high power high frequency induction heating device. The method according to claim 4, The large power high frequency induction heating apparatus, A high frequency transformer converting a high frequency AC current input from the high frequency power source into a large power high frequency current through a primary coil and a secondary coil and outputting the high frequency high frequency current; A resonance high frequency capacitor having a capacitance value C for generating a resonance phenomenon with respect to the high power high frequency current; And And a heating coil in which thermal energy is generated by an induction current generated by a high frequency magnetic field derived from the high power high frequency current. In claim 5, And the high frequency transformer and the resonant high frequency capacitor are mounted in one current converter.

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