COIL ASSEMBLY FOR INDUCTION HEATING DEVICE AND INDUCTION
HEATING DEVICE COMPRISING SAME
5
【Technical Field】
The present disclosure relates to a coil assembly for an
induction heating device and an induction heating device
including the same.
10
【Background Art】
An induction heating device is a device forming a strong
alternating magnetic field to form an induced current in a
heated member by electromagnetic induction so as to heat the
15 heated member.
An induction heating device for heating a conductive plate
such as a steel plate, or the like, is generally divided into
two types, that is, a longitudinal heating coil (LF) and a
transverse heating coil (TF). The longitudinal heating coil is
20 a device in which a heating coil surrounds the conductive plate,
and an induction current flows in the heating coil, to generate
magnetic flux in a longitudinal direction of a heated member.
The transverse heating coil is a device for heating in which
a conductive plate traverses magnetic flux flowing in heating
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coils on both sides thereof, so that an induction current is
generated in a plane of the conductive plate.
A longitudinal heating coil requires a high frequency when
heating a thin material, so that it is problematic to heat the
5 thin material. However, the transverse heating coil has a higher
degree of heating efficiency, even at a lower frequency than
the longitudinal heating coil.
In order to increase the heating efficiency in the
transverse heating coil, a gap between a heating coil and a
10 conductive plate should be narrow, so the longitudinal cross
sectional area of the heating coil should be designed to be wide.
If a heating coil is regarded as being a general
transformer, a voltage across a coil is proportional to the
number of turns of the coil, due to characteristics of a
15 transformer. As the number of turns of the coil increases, an
applied voltage also rises. Therefore, a problem such as
insulator breakdown between windings, called a coil body, due
to a high voltage, may occur. Since a voltage and a current are
in inverse proportion at the same level of power, it is desirable
20 to transmit energy to a conductive plate while protecting a coil
by decreasing the number of turns of a coil to reduce a coil
voltage and increasing a current.
On the other hand, when a coil is manufactured, in the
case of significantly high capacity equipment, if only a copper
25 pipe is used to manufacture a coil, in order to solve a high
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calorific value, a line in which cooling water flows in and out
should be additionally disposed for each middle portion of a
coil. Thus, a significant amount of welding work may be required.
If a welding area is increased, leakage accidents occur
5 frequently. Moreover, due to the characteristics of the
equipment in which a large current flows, it may lead to a
significantly large amount of arc damage. Thus, a problem of
a serious degree of recovery costs may occur.
FIG. 1 is an exemplary view illustrating a heating coil
10 according to the related art.
With reference to FIG. 1, a heating coil according to the
related art is a simple air-core type heating coil in which a
coil and a cooling pipe are integrated. Thus, the heating coil
has a large amount of heat and the coil has a small longitudinal
15 cross sectional area. Moreover, since a cooling water intake
and exhaust line is further disposed in the middle of the coil,
a welding operation for branching intermediate cooling water
is required. Therefore, a leakage current is frequent, and an
electric current may flow in a weld area, so the weld area may
20 be affected by surface resistance, which may frequently cause
arc damage.
【Disclosure】
【Technical Problem】
25 An aspect of the present disclosure may provide a coil
Page 5
assembly for an induction heating device, improving a
longitudinal cross sectional area of a coil, and preventing
leakage of cooling water, and an induction heating device
including the same.
5
【Technical Solution】
According to an aspect of the present disclosure, a coil
assembly for an induction heating device includes a first coil
part having a first cooling pipe insertion groove, indented into
10 the inside thereof, in one surface, a first cooling pipe
combined with the first cooling pipe insertion groove such that
a portion of an outer surface is exposed, a second coil part
disposed opposite to one surface of the first coil part provided
with the first cooling pipe insertion groove, and having a
15 second cooling pipe insertion groove, indented into the inside
thereof, in one surface opposite to one surface of the first
coil part, and a second cooling pipe combined with the second
cooling pipe insertion groove such that a portion of an outer
surface is exposed.
20 The first coil part and the second coil part may include
a plurality of heating conductors arranged side by side, and
a connecting conductor connecting one ends of a heating
conductor provided as the plurality of heating conductors to
each other.
25 The heating conductor and the connecting conductor of the
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first coil part may be disposed opposite to the heating
conductor and the connecting conductor of the second coil part.
The first cooling pipe and the second cooling pipe may
be provided continuously in the heating conductor and the
5 connecting conductor.
The other end of the heating conductor of the first coil
part and the second coil part may be provided with a coupling
part for coupling the first coil part and the second coil part.
The heating conductor of the first coil part may include
10 a first heating conductor and a second heating conductor, the
heating conductor of the second coil part may include a third
heating conductor and a fourth heating conductor, opposite to
the first heating conductor and the second heating conductor,
respectively, and the coupling part may be provided in the other
15 end of the first heating conductor and the other end of the fourth
heating conductor or the other end of the second heating
conductor and the other end of the third heating conductor.
The coupling part provided in the first coil part and the
coupling part of the second coil part may be screw-coupled to
20 each other.
A gap between the coupling part provided in the first coil
part and the coupling part provided in the second coil part may
be provided with an insulating member.
The first cooling pipe and the second cooling pipe may
25 be disposed in the inside of the coupling part.
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The first cooling pipe insertion groove and the second
cooling pipe insertion groove may be provided to have shapes
corresponding to outer surfaces of the first cooling pipe and
the second cooling pipe, respectively.
5 The first cooling pipe and the second cooling pipe may
be press-fit into the first cooling pipe insertion groove and
the second cooling pipe insertion groove, respectively.
According to another aspect of the present disclosure,
an induction heating device includes the coil assembly for an
10 induction heating device, a power supply coupled to a first coil
part and a second coil part to supply AC power, and a cooling
pump coupled to a first cooling pipe and a second cooling pipe
to supply cooling water.
The coil assembly for an induction heating device may be
15 provided as a pair of coil assemblies for an induction heating
device disposed to be spaced apart from each other, with a
conductive plate passing between the pair of coil assemblies
for an induction heating device.
The coil assembly for an induction heating device may be
20 disposed to intersect a direction in which the conductive plate
is supplied.
【Advantageous Effects】
According to an exemplary embodiment in the present
25 disclosure, in a coil assembly for an induction heating device
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and an induction heating device, a weld zone is reduced in a
coil, so heating efficiency may be improved and leakage may be
prevented.
5 【Description of Drawings】
FIG. 1 is an exemplary view illustrating a heating coil
according to the related art.
FIG. 2 is a schematic exploded perspective view of a coil
assembly for an induction heating device according to an
10 exemplary embodiment.
FIG. 3 is a schematic cross-sectional view taken along
line A-A’ of FIG. 2.
FIG. 4 is a schematic side view of an induction heating
device in which a core is detached from a coil assembly for an
15 induction heating device according to an exemplary embodiment.
FIG. 5 is a schematic enlarged view of portion B of FIG.
2.
FIG. 6 is a schematic cross-sectional view taken along
line C-C’ of FIG. 5.
20
【Best Mode for Invention】
Prior to the description of the present invention, terms
and words used in the present specification and claims to be
described below should not be construed as limited to ordinary
25 or dictionary terms, and should be construed in accordance with
Page 9
the technical idea of the present invention based on the
principle that the inventors can properly define their own
inventions in terms of terms in order to best explain the
invention. Therefore, the embodiments described in the present
5 specification and the configurations illustrated in the
drawings are merely the most preferred embodiments of the
present invention and are not intended to represent all of the
technical ideas of the present invention, and thus should be
understood that various equivalents and modifications may be
10 substituted at the time of the present application.
Hereinafter, preferred embodiments of the present
invention will be described in detail with reference to the
accompanying drawings. In this case, in the drawings, the same
components are denoted by the same reference symbols as possible.
15 Further, the detailed description of well-known functions and
constructions which may obscure the gist of the present
invention will be omitted. For the same reason, some of the
elements in the accompanying drawings are exaggerated, omitted,
or schematically illustrated, and the size of each element does
20 not entirely reflect the actual size.
In addition, in the present specification, the
expressions such as an upper side, a lower side, a side face,
and the like, are described based on the drawings and may be
expressed differently when the direction of the corresponding
25 object is changed.
Page 10
FIG. 2 is a schematic exploded perspective view of an
induction heating device according to an exemplary embodiment,
FIG. 3 is a schematic cross-sectional view taken along line A-A’
of FIG. 2, and FIG. 4 is a schematic side view of an induction
5 heating device in which a core is detached from an induction
heating device according to an exemplary embodiment.
With reference to FIGS. 2 through 4, an induction heating
device 10 according to an exemplary embodiment may include a
coil assembly for an induction heating device 500, a separate
10 power supply applying AC power to the coil assembly for an
induction heating device 500, and a cooling pump coupled to the
coil assembly for an induction heating device 500 and supplying
cooling water.
The coil assembly for an induction heating device 500 may
15 include a first coil part 100 and a second coil part 200, and
a separate power supply (not shown) supplying AC power may be
connected to the first coil part 100 and the second coil part
200.
The first coil part 100 may be provided to have a U-shape
20 as a whole, and a material therefor may preferably be a metal
material with high conductivity. For example, the first coil
part 100 may be formed of a 99% pure electrolytic tough pitch
(ETP) copper wide flare material.
In one surface of the first coil part 100, a first cooling
25 pipe insertion groove 110, indented into the inside thereof,
Page 11
may be provided. The first cooling pipe insertion groove 110,
provided as at least one first cooling pipe insertion groove,
may be continuously arranged along one surface of the first coil
part 100, and may be manufactured by cutting into one surface
5 of the first coil part 100, or may be manufactured at the same
time as the first coil part 100.
A first cooling pipe 120 may be combined with the first
cooling pipe insertion groove 110. Here, the first cooling pipe
insertion groove 110 may be provided to have a shape
10 corresponding to an outer surface of the first cooling pipe 120,
and the first cooling pipe 120 may be press-fitted into the first
cooling pipe insertion groove 110. However, a method in which
the first cooling pipe is combined with the first cooling pipe
insertion groove 110 is not limited to press-fitting, and
15 various methods commonly used in the art to which the present
invention belongs may be employed, such as welding, or the like.
The first coil part 100 may include a plurality of heating
conductors 101 arranged to intersect a direction in which a
conductive plate P is supplied, and a connecting conductor 102
20 connecting one ends of a heating conductor 101, by way of example.
Here, the direction in which the conductive plate P is supplied
is indicated by an arrow and the letter 'D' in FIG. 2.
The heating conductor 101 may be provided as a plurality
of heating conductors arranged side by side, and may include
25 a first heating conductor 101a and a second heating conductor
Page 12
101b, by way of example.
One end of the heating conductor 101 may be provided with
the connecting conductor 102 connecting two heating conductors
101. Here, the heating conductor 101 and the connecting
5 conductor 102 may be manufactured as separate members and
coupled together by a method such as welding, or the like, or
may be integrally molded at the same time during manufacture.
One surface of the first coil part 100, in detail, one
surface of the heating conductor 101 and the connecting
10 conductor 102 may be provided with the first cooling pipe
insertion groove 110, indented into the inside thereof. The
first cooling pipe insertion groove 110 may be provided
continuously along one surface of the first coil part 100. In
other words, the first cooling pipe insertion groove 110 may
15 be provided continuously in one surface of the first heating
conductor 101a, the connecting conductor 102, and the second
heating conductor 101b.
Meanwhile, as previously described, a method of
manufacturing the first cooling pipe insertion groove 110 may
20 be a cutting machining process. As described above, when the
first cooling pipe insertion groove 110 for coupling of the
first cooling pipe 120 is cutting machined in one surface of
the first coil part 100 in advance, and the first cooling pipe
120 is press-fitted thereinto, the first cooling pipe 120 may
25 be tightly coupled to the first coil part 100 during indentation.
Page 13
In addition, only a small amount of additional soldering and
brazing operations may be required.
Thus, a welding work area may be significantly reduced,
and an effect of surface resistance, slightly increased by
5 welding materials, may be not significant, so heating
efficiency may be improved.
In addition, a degree of current flowing to a weld zone
of a cooling pipe is significantly reduced, so a risk caused
by internal leakage may be reduced. Moreover, stability of the
10 use of a coil part in a harsh environment such as a steel
processing line may be improved.
At least one first cooling pipe 120 may be combined with
the first cooling pipe insertion groove 110. In this case, the
first cooling pipe 120 may be combined with the first cooling
15 pipe insertion groove 110 while a portion of an outer surface
is exposed externally. In other words, in the first cooling pipe
120, a portion of an outer surface may be exposed to one surface
of the first cooling pipe insertion groove 110. In this case,
the first cooling pipe 120 may be provided continuously in one
20 surface of the first coil part 100 along the first cooling pipe
insertion groove 110, and may be provided in a U-shape as a whole.
In addition, the first cooling pipe 120 may be connected to
a separate cooling pump (not shown), and the cooling pump may
supply cooling water to the first cooling pipe 120.
25 Thus, when the first coil part 100 is heated, the first
Page 14
cooling pipe 120 may allow the first coil part 100, having been
heated, to be cooled.
Meanwhile, the other end of the first coil part 100, that
is, an end in which the connecting conductor 102 is not provided,
5 may be provided with a coupling part 130 for coupling of the
second coil part 200 which will be described later.
The coupling part 130 may be coupled to a coupling part
230 of the second coil part 200 which will be described later,
and a detailed description thereof will be provided later.
10 The second coil part 200 may be disposed opposite to one
surface of the first coil part 100 provided with the first
cooling pipe insertion groove 110, and one surface opposite to
one surface of the first coil part 100 may be provided with a
second cooling pipe insertion groove 210, indented into the
15 inside thereof.
In addition, a second cooling pipe 220 may be combined
with the second cooling pipe insertion groove 210. In this case,
a portion of an outer surface of the second cooling pipe 220
may be exposed to one surface of the second coil part 200. Thus,
20 the outer surface of the first cooling pipe 120, having been
exposed, may be provided to opposite to the outer surface of
the second cooling pipe 220, having been exposed.
The second coil part 200 may include a third heating
conductor 201a and a fourth heating conductor 201b opposite to
25 the first heating conductor 101a and the second heating
Page 15
conductor 101b of the first coil part 100, respectively, by way
of example, and the third heating conductor 201a and the fourth
heating conductor 201b may be connected by a connecting
conductor 202. In addition, the connecting conductor 202 may
5 be disposed opposite to the connecting conductor 202 of the
first coil part 100.
Here, the second coil part 200 may be provided to have
the same shape as that of the first coil part 100 described
previously. In other words, with reference to FIG. 4, the second
10 coil part 200 may be provided symmetrically with respect to the
first coil part 200 based on the conductive plate P.
Thus, a detailed description of the second coil part 200
is omitted and replaced with the detailed description of the
first coil portion 100.
15 Meanwhile, the coupling parts 130 and 230 may be coupled
to the first coil part 100 and the second coil part 200,
respectively. As the coupling parts 130 and 230 are
screw-coupled, the first coil part 100 and the second coil part
200 may be coupled to each other. Hereinafter, the coupling
20 relationship between the first coil part 100 and the second coil
part 200 will be described with reference to FIGS. 5 and 6.
FIG. 5 is an enlarged view of portion B of FIG. 2, and
FIG. 6 is a schematic cross-sectional view taken along line C-C’
of FIG. 5. With reference to FIGS. 5 and 6, the coupling parts
25 130 and 230 may be provided in the other end in which the
Page 16
connecting conductors 102 and 202 of the first coil part 100
and the second coil part 200 are not provided, respectively.
In this case, the coupling parts 130 and 230 may be
provided in the first heating conductor 101a of the first coil
5 part 100 and the fourth heating conductor 201b of the second
coil part 200, or may be provided in the second heating conductor
101b of the first coil part 100 and the third heating conductor
201a of the second coil part 200.
In addition, in a heating conductor provided as a pair
10 of heating conductors, the coupling parts 130 and 230 of one
heating conductor may be provided to protrude toward the other
heating conductor, and a plurality of screw holes 130a may be
provided therein.
A screw hole 130a is provided with a male thread 131 and
15 a female thread 132, the first coil part 100 and the second coil
part 200 are screw-coupled.
Here, an insulating member 140 may be provided between
the coupling part 130 of the first coil part 100 and the coupling
part 230 of the second coil part 200. The insulating member 140
20 is provided as an insulator, thereby preventing a phenomenon
in which the first coil part 100 and the second coil part 200
are electrically short-circuited. The insulating member 140 may
be provided with at least one screw through hole 140a.
Meanwhile, the first cooling pipe 120 and the second
25 cooling pipe 220 may be disposed in the coupling parts 130 and
Page 17
230. In other words, a cooling pipe passing through the heating
conductors 101 and 201 may pass through the inside of the
coupling parts 130 and 230.
However, in a similar manner to the heating conductors
5 101 and 201, as a portion of an outer surface of the first cooling
pipe 120 and the second cooling pipe 220 is exposed, the first
cooling pipe 120 and the second cooling pipe 220 may be coupled
to the coupling parts 130 and 230.
As described above, the first coil part 100 and the second
10 coil part 200 are screw-coupled through the coupling part 130.
Thus, the first coil part 100 and the second coil part 200 may
be easily coupled to each other without a brazing process
performed by a skilled welding technician, and replacement and
repair may be easily performed, as advantages.
15 Meanwhile, a core 600 may be coupled to the coil assembly
for an induction heating device 500 to allow the other surface
of the second coil part 200, which is not opposite to the first
coil part 100, to be exposed externally.
As an example, a body part 610 of the core 600 may be
20 provided with an accommodating groove 620 indented into the
inside thereof to accommodate the coil part. Here, the
accommodating groove 620 is provided in a U-shape as a whole,
so the first coil part 100 and the second coil part 200 may be
accommodated, and the other surface of the second coil part 200
25 may be exposed externally.
Page 18
Here, the conductive plate P may pass below the other
surface of the second coil part 200, and the coil assembly for
an induction heating device 500 may be disposed to intersect
a direction in which a conductive plate is supplied.
5 Moreover, the coil assembly for an induction heating
device 500 may be provided as a pair of coil assemblies. In other
words, the coil assembly for an induction heating device 500
may be provided as two coil assemblies as a pair, spaced apart
from each other. The conductive plate P may pass between the
10 coil assemblies for an induction heating device.
As described above, when the coil assemblies for an
induction heating device 500 are disposed in both surfaces of
the conductive plate P, heating efficiency of the conductive
plate P may be improved.
15 While the present disclosure has been particularly shown
and described with reference to exemplary embodiments thereof,
but is not limited thereto. It will be apparent to those skilled
in the art that various changes and modifications thereof may
be made within the spirit and scope of the present disclosure,
20 and therefore, it is to be understood that such changes and
modifications belong to the scope of the appended claims.

WE CLAIM:
【Claim 1】
A coil assembly for an induction heating device,
5 comprising:
a first coil part having a first cooling pipe insertion
groove, indented into the inside thereof, in one surface;
a first cooling pipe combined with the first cooling pipe
insertion groove such that a portion of an outer surface is
10 exposed;
a second coil part disposed opposite to one surface of
the first coil part provided with the first cooling pipe
insertion groove, and having a second cooling pipe insertion
groove, indented into the inside thereof, in one surface
15 opposite to one surface of the first coil part; and
a second cooling pipe combined with the second cooling
pipe insertion groove such that a portion of an outer surface
is exposed.
20 【Claim 2】
The coil assembly for an induction heating device of claim
1, wherein the first coil part and the second coil part include
a plurality of heating conductors arranged side by side, and
a connecting conductor connecting one ends of a heating
25 conductor provided as the plurality of heating conductors to
Page 20
each other.
【Claim 3】
The coil assembly for an induction heating device of claim
5 2, wherein the heating conductor and the connecting conductor
of the first coil part are disposed opposite to the heating
conductor and the connecting conductor of the second coil part.
【Claim 4】
10 The coil assembly for an induction heating device of claim
2, wherein the first cooling pipe and the second cooling pipe
are provided continuously in the heating conductor and the
connecting conductor.
15 【Claim 5】
The coil assembly for an induction heating device of claim
2, wherein the other end of the heating conductor of the first
coil part and the second coil part is provided with a coupling
part for coupling the first coil part and the second coil part.
20
【Claim 6】
The coil assembly for an induction heating device of claim
5, wherein the heating conductor of the first coil part includes
a first heating conductor and a second heating conductor, the
Page 21
heating conductor of the second coil part includes a third
heating conductor and a fourth heating conductor opposite to
the first heating conductor and the second heating conductor,
respectively, and the coupling part is provided in the other
5 end of the first heating conductor and the other end of the fourth
heating conductor or the other end of the second heating
conductor and the other end of the third heating conductor.
【Claim 7】
10 The coil assembly for an induction heating device of claim
5, wherein the coupling part provided in the first coil part
and the coupling part provided in the second coil part are
screw-coupled to each other.
15 【Claim 8】
The coil assembly for an induction heating device of claim
7, wherein a gap between the coupling part provided in the first
coil part and the coupling part provided in the second coil part
is provided with an insulating member.
20
【Claim 9】
The coil assembly for an induction heating device of claim
5, wherein the first cooling pipe and the second cooling pipe
are disposed in the inside of the coupling part.
25
Page 22
【Claim 10】
The coil assembly for an induction heating device of claim
1, wherein the first cooling pipe insertion groove and the
second cooling pipe insertion groove are provided to have shapes
5 corresponding to outer surfaces of the first cooling pipe and
the second cooling pipe, respectively.
【Claim 11】
The coil assembly for an induction heating device of claim
10 10, wherein the first cooling pipe and the second cooling pipe
are press-fit into the first cooling pipe insertion groove and
the second cooling pipe insertion groove, respectively.
【Claim 12】
15 An induction heating device, comprising:
the coil assembly for an induction heating device
according to any one of claims 1 to 11;
a power supply coupled to a first coil part and a second
coil part to supply alternating current (AC) power; and
20 a cooling pump coupled to a first cooling pipe and a second
cooling pipe to supply cooling water.
【Claim 13】
The induction heating device of claim 12, wherein the coil
Page 23
assembly for an induction heating device is provided as a pair
of coil assemblies for an induction heating device disposed to
be spaced apart from each other, with a conductive plate passing
between the pair of coil assemblies for an induction heating
5 device.
【Claim 14】
The induction heating device of claim 13, wherein the coil
assembly for an induction heating device is disposed to
10 intersect a direction in which the conductive plate is supplied.