KR20230129708A - Induction heating coil including core members of different height each other for uniform heating along width direction - Google Patents

Abstract

The present invention provides an induction heating coil including core members with different heights to guarantee uniform heating in a width direction, which comprises: a heated material of which both surfaces are heated to be merged; a pair of coil members separated and arranged on both sides of the heated material to face each other, and protruding to be close to one surface facing the heated material; and a core member formed to be close along one surface of the protruding coil members, and penetrating the inside of coils to form a housing cover.

Description

Induction heating coil that ensures uniform heating in the width direction, including core members with different heights {INDUCTION HEATING COIL INCLUDING CORE MEMBERS OF DIFFERENT HEIGHT EACH OTHER FOR UNIFORM HEATING ALONG WIDTH DIRECTION}

The present invention relates to an induction heating coil that ensures uniform heating in the width direction by including core members of different heights. More specifically, it relates to an induction heating coil that includes core members of different heights that can maximize magnetic flux density and cooling efficiency and ensures uniform heating in the width direction. It relates to an induction heating coil that ensures uniform heating.

Induction heating using high-frequency current of a material to be heated is widely used for heat treatment, including quenching. For the purpose of controlling the material during the manufacturing process of ferrous and non-ferrous thin plates such as steel plates and aluminum plates, and for the purpose of improving productivity or freely adjusting production volume by increasing the heating rate, indirect heating using conventional gas heating or electric heating is used. It is used as a heating method to replace heating.

When induction heating a material to be heated, there are two major methods. One is the so-called LF (longitudinal magnetic flux heating) method, in which a high-frequency current flows through an induction coil surrounding the material to be heated, the generated magnetic flux penetrates the width direction of the metal plate, and an induced current is generated within the cross section of the material to be heated, thereby heating it. It is called an induction heating method, and the other is to place a material to be heated between coils and apply a current to the coil, and the magnetic flux generated passes across the material to be heated, thereby generating an induced current in the plane of the metal plate. It is a TF (transverse heating) method of heating.

LF type induction heating has good uniformity of temperature distribution, but the generated induced current circulates within the plate cross section. From the relationship between current penetration depth, if the thickness of the material to be heated is thin, the frequency of the power source must be increased unless the frequency of the power source is increased. There is a problem in that no current is generated, and even for non-magnetic or magnetic materials, if the temperature exceeds the Curie point, the penetration depth of the current becomes deeper, so thin plates cannot be heated.

On the other hand, the TF type induction heating has the characteristic that the magnetic flux penetrates the plane of the material to be heated, so it can be heated without distinguishing between the thickness of the material to be heated or whether it is magnetic or non-magnetic, or the leakage magnetic flux can be reduced by using a magnetoresistive coil. , it has the characteristic of high heating efficiency because it is possible to concentrate magnetic flux between coils arranged opposite to both ends of the material to be heated.

However, the TF type induction heating has the problem that uneven temperature distribution is prone to occur. Moreover, when TF-type induction heating is applied to a sheet heating line, there is a drawback in that the temperature in the width direction is uneven, the edges at both ends are overheated, and response is difficult.

In particular, the conventional TF method had a problem in that its efficiency was reduced due to the heat generated by itself. When current is applied to the coil and magnetic force is generated, the coil itself is gradually heated, and as a result, the magnetic force crossing the material to be heated gradually decreases. This is because the heat generated gradually increases over time, causing the material to be heated to be inductively heated. There is a problem of decreased city efficiency.

Korean Patent Publication No. 10-2020-0075662 (published on June 26, 2020) Korean registered patent 10-2031865 (announced on October 15, 2019)

The present invention was developed to solve the above problems, and provides uniform heating in the width direction, including core members of different heights, which can maximize magnetic flux density and cooling efficiency in order to resolve temperature unevenness in the width direction and increase efficiency. The purpose is to provide an induction heating coil that guarantees

According to an embodiment of the present invention, an induction heating coil that includes core members of different heights and ensures uniform heating in the width direction is a material to be heated and bonded on both sides, and is paired to face each side of the material to be heated. A coil member that is spaced apart and protrudes to be close to one surface facing the material to be heated, and a core member that is formed to be proximate along one surface of each of the protruding coil members and penetrates the inside of each coil to the housing cover. It can be included.

Each of the coil members may be wound around each core member at least once or more along the inner surface of each inner groove and the outer surface of the core member.

It may include a cooling passage formed in a portion of the coil member.

It includes a reinforcing part that is stepped to have a large thickness toward the material to be heated, and a support part that is formed to have a thickness smaller than the thickness of the reinforcing part, and the coil member may include a silver material or silver plating formed on a portion of the coil member.

The core member may include a gap spaced apart to form a cooling air flow path.

It may include an insulating member formed to surround a core member adjacent to a protruding portion of the coil member.

It may include a power supply terminal and a refrigerant supply unit formed at one end along the longitudinal direction of the coil member.

According to the induction heating coil that includes core members with different heights and ensures uniform heating in the width direction according to an embodiment of the present invention as described above, the contact end of the coil adjacent to the material to be heated is oriented in the width direction of the material to be heated. Accordingly, since it is arranged eccentrically at one corner and the end is formed thick, heating performance can be improved by maximizing the magnetic flux density to the heating area.

In addition, durability can be increased by effectively dispersing the load generated at the contact area of the coil member with the heating material.

In addition, durability can be improved by reducing the amount of heat generated by the core member and the coil member itself and preventing core burnout by effectively cooling the heated core member and coil member.

Figures 1 and 2 are perspective views of an induction heating coil that includes core members with different heights and ensures uniform heating in the width direction according to an embodiment of the present invention.
Figures 3 and 4 are perspective views showing the core member and coil member on either side of an induction heating coil that includes core members with different heights and ensures uniform heating in the width direction according to an embodiment of the present invention, separated.
Figure 5 is a front view showing a coil member on one side of an induction heating coil that includes core members with different heights and ensures uniform heating in the width direction according to an embodiment of the present invention.
Figure 6 is a rear view of Figure 5.
Figure 7 is a cross-sectional view showing the internal cooling passage of Figure 5.
Figure 8 is a cross-sectional view taken along line II' of Figure 1.
FIG. 9 is a cross-sectional view taken along line II-II' of FIG. 1.
FIG. 10 shows a state in which a material to be heated is provided in a cross-sectional view taken along line III-III' of FIG. 1.
FIG. 11 shows a state in which the contact end of the coil member of FIG. 10 is in contact with a material to be heated.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. The present embodiments are merely provided to ensure that the disclosure of the present invention is complete and to provide a general understanding of the technical field to which the present invention pertains. It is provided to fully inform the skilled person of the scope of the present invention, and the present invention is only defined by the scope of the claims.

The terminology used herein is for describing embodiments and is not intended to limit the invention. As used herein, singular forms also include plural forms, unless specifically stated otherwise in the context. As used in the specification, “comprises” and/or “comprising” does not exclude the presence or addition of one or more other elements in addition to the mentioned elements. Like reference numerals refer to like elements throughout the specification, and “and/or” includes each and every combination of one or more of the referenced elements. Although “first”, “second”, etc. are used to describe various components, these components are of course not limited by these terms. These terms are merely used to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may also be a second component within the technical spirit of the present invention.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used with meanings commonly understood by those skilled in the art to which the present invention pertains. Additionally, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless clearly specifically defined.

Spatially relative terms such as “below”, “beneath”, “lower”, “above”, “upper”, etc. are used as a single term as shown in the drawing. It can be used to easily describe the correlation between a component and other components. Spatially relative terms should be understood as terms that include different directions of components during use or operation in addition to the directions shown in the drawings. For example, if a component shown in a drawing is flipped over, a component described as “below” or “beneath” another component will be placed “above” the other component. You can. Accordingly, the illustrative term “down” may include both downward and upward directions. Components can also be oriented in other directions, so spatially relative terms can be interpreted according to orientation.

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

Figures 1 and 2 are perspective views of an induction heating coil that includes core members with different heights and ensures uniform heating in the width direction according to an embodiment of the present invention, and Figures 3 and 4 are a perspective view of an induction heating coil according to an embodiment of the present invention. Figure 5 is a perspective view showing the core member and coil member on one side of an induction heating coil that ensures uniform heating in the width direction, including core members with different heights, separated from each other, and Figure 5 is a perspective view of a core member and a coil member with different heights according to an embodiment of the present invention. It is a front view showing a coil member on one side of an induction heating coil that includes the core member and ensures uniform heating in the width direction. Figure 6 is a rear view of Figure 5, and Figure 7 is a cross-sectional view showing the internal cooling passage of Figure 5. , FIG. 8 is a cross-sectional view along line II-I' of FIG. 1, FIG. 9 is a cross-sectional view along line II-II' of FIG. 1, and FIG. 10 is a cross-sectional view along line III-III' of FIG. 1 showing the material to be heated. It shows the prepared state, and FIG. 11 shows the state in which the contact end of the coil member of FIG. 10 is in contact with the material to be heated.

1 to 11, an induction heating coil that includes core members with different heights and ensures uniform heating in the width direction according to an embodiment of the present invention includes a pair of housings 100 and a mounting groove 100a. , it may include a core member 200, an inner groove 201, a coil member 300, and cooling passages 311, 321, and 331.

The housing 100 has one side open to provide a predetermined space so that the core member 200 and the coil member 300 can be built in, and the open side is sealed by the housing cover 101.

The housings 100 may be provided as a pair spaced apart to face each other, and each housing 100 may be formed to have a polygonal cross-section and a predetermined length.

The material to be heated (M) described below may refer to a stack-pouch type battery, and the edges of the pouch in the width direction of this stack-pouch type battery are joined so that the sealing portion is sealed so that the width of both sides along the longitudinal direction is sealed. This is heated and adheres closely.

The pair of housings 100 is pressed inward toward the material to be heated (M) disposed inside, thereby heating the material (M) by passing magnetic flux through it. Here, the space where the facing surfaces of the housing 100 are located is defined as the inside, and with the inside of the housing 100 as the center, the outside, which is the opposite side of the inside of the pair of housings 100, is defined as the outside.

Although not shown, the pair of housings 100 may be connected to the outer surfaces of each of the pair and may be disposed with a driving cylinder for pressing them inward, and the pair of housings 100 may be connected to the material to be heated by the driving cylinder. It can be moved along a direction approaching and away from (M).

Hereinafter, for convenience of explanation, the core member 200 and the coil member 300 will be described as being seated in the mounting groove 100a of the housing 100 on one side, but the core member 200 and the coil member 300 are seated in the mounting groove 100a of the housing 100 on one side. It should be understood that the member 200 and the coil member 300 are seated. However, the pair of housings 100 and the core member 200 and coil member 300 disposed therein have a shape that is symmetrical with respect to the space between the pair of housings 100 or the material to be heated (M). can be formed. In addition, the coil member 300 may be formed so that any one member having a continuous predetermined length is continuously bent and wound around the core member 200 at least once, but in the wound state of the coil member 300 Depending on the location, they will be described separately as a first coil 310, a second coil 320, a third coil 330, and a fourth coil 340.

That is, the coil member 300 is formed along the longitudinal direction of the core member 200, and the first coil 310, which is in surface contact with the outer surface of the core member 200, is formed along the longitudinal direction of the first coil 310. It is connected to the end along the second coil 320 formed along the longitudinal direction of the inner groove 201 while seated in the inner groove 201, and connected to the end along the longitudinal direction of the second coil 320. , It may include a third coil 330 formed along the longitudinal direction of the core member 200 in a state disposed close to the outer surface of the second coil 320.

Mounting grooves 100a may be formed along each longitudinal direction on the inner surface of the housing 100.

The mounting groove 100a is formed as a groove on the inner surface of the housing 100 and may mean a space in which the core member 200 and the coil member 300 can be seated, as will be described later.

The core member 200 may be formed to be seated in the mounting groove 100a. That is, the core member 200 can be formed to fill the space of the mounting groove 100a and thus can have various cross-sectional shapes and be formed along the longitudinal direction of the housing 100.

The core member 200 may have an opening 200a that opens toward the inside of the housing 100. The opening 200a is formed along the longitudinal direction of the core member 200, and a bent portion 210 may be formed along the longitudinal direction of the opening 200a. The bent portion 210 may be formed to protrude to surround a portion of the inner portion of the coil member 300. The bent portion 210 supports the coil member 300 so that it is firmly fixed.

A flat portion 220 may be formed on one side of the opening 200a facing the bent portion 210 and formed on a side perpendicular to the bent portion 210. In addition, a stepped portion 221 is formed from the flat portion 220 toward the inner groove 201 to expand the space on the inner groove 201 side. At this time, the space on the inner groove 201 side may mean the space occupied inside the inner groove 201 by the fourth coil 340, which will be described later. Additionally, the fourth coil 340 and the flat portion 220 may be spaced apart to form a space. The space between the fourth coil 340 and the flat part 220 forms a gap of a minimum distance to maintain mutual insulation, and the contact end 231 formed by the fourth coil 340 and the flat part 220 It is desirable to minimize the area of ) so that the contact area with the heating material (M) is of an appropriate width. The contact end 231 may include an area in contact with the heating material M of the fourth coil 340 and an area in contact with the heating material M, which is a side of the flat portion 220.

In particular, the contact end 341 of the fourth coil 340 may be formed to have a greater thickness by forming a stepped end on the side of the material to be heated (M). That is, the end is formed to be thicker than the thickness of the inner groove 201 of the fourth coil 340, which increases the magnetic flux density of the contact end 341 close to the material to be heated (M), and the core member 340 This is to ensure sufficient rigidity to support the load caused by the pressing force transmitted in the extended contact state.

In addition, an insulating member 230 may be included to prevent the contact ends 231 and 341 from being electrically connected by directly contacting the heating material M, and to serve as a buffer for insulation and coil protection. The insulating member 230 is preferably disposed between the contact ends 231 and 341 and the heating material M so that the contact ends 231 and 341 do not directly contact the heating material M. However, the insulating member 230 is preferably insulated. The member 230 is stably maintained at the contact ends 231 and 341 and is formed in an 'E' or 'F' shape (to prevent falling off) so that it can be replaced periodically. 341) can be formed to surround the surrounding area. In this embodiment, as an example, the shape of the insulating member 230 is shown as an 'F' shape, but various shapes that can prevent the contact ends 231 and 341 from directly contacting the material to be heated (M) can be applied. It is possible, so it is not limited to this.

The contact ends 341 of the fourth coil 340 are arranged to be spaced apart in pairs so as to face both sides of the material to be heated (M), and are eccentric toward one edge along the width direction of the material to be heated (M). It may be formed in a protruding form close to one surface facing the heating material (M). This shows the effect that the magnetic field is formed along area A, as shown in FIG. 10. That is, by concentrating the heating area around the contact ends 231 and 341 in contact with the material to be heated (M), a concentrated current density can be expected.

The inner groove 201 formed in the facing direction of each core member 200 may mean a groove dug into the inside of each core member 200. A portion of the coil member 300 may be formed to contact the inner surface of the inner groove 201, or the coil member 300 may be in contact along the entire length of the inner groove 201. In addition, of course, it may be continuously wound to completely surround the outer surface 202 of the core member 200.

The core member 200 is configured to form an induced magnetic field together with the coil member 300. For this purpose, the core member 200 may be made of a magnetic material. The core member 200 is configured to accommodate the coil member 300, as will be described later.

Each coil member 300 may be wound around the core member 200 at a predetermined length. For example, at the end of the first coil 310, there is a power supply unit 110 for supplying current to the coil member 300, 120) and a control unit (not shown) for controlling the current supply intensity, etc. may be further included.

Additionally, the coil member 300 may be covered with an insulating material or an insulating material. For example, the surface of the coil member 300 may be coated with an insulating material to block electrical connection with the core member 200.

A first cooling passage 311 may be formed in the first coil 310. Refrigerant may be introduced into the first cooling passage 311 and flow along the inside of the first coil 310. Therefore, even if a current is applied to the first coil 310 and the first coil 310 itself generates heat, it is cooled by the refrigerant. Likewise, a second cooling passage 321 and a third cooling passage 331 may be formed inside the second coil 320 and the third coil 330. The second cooling passage 321 and the third cooling passage 331 each perform the same role as the first cooling passage 311.

Additionally, a refrigerant supply unit 130 and a refrigerant discharge unit 332 may be formed at one end of the first coil 310 and each end of the third coil 330. The refrigerant supply part 130 serves as an inlet so that the refrigerant can be injected from the outside into the inside of the coil member 300 along the refrigerant inlet 131, and the refrigerant discharge part 332 is supplied from the first coil 310. 3 It serves as an outlet through which the refrigerant that has finished flowing to the coil 330 is discharged from the coil member 300 to the outside.

The second coil 320 and the third coil 330 may be connected through a connection portion 321 that bypasses the first coil 310 and passes through it. The connection portion 321 may be made of the same material as that of the second coil 320 and the third coil 330, and may extend to bypass the first coil 310. At this time, inside the connection portion 321, a connection cooling passage 322 is communicated with the second cooling passage 321 of the second coil 320 and the third cooling passage 331 of the third coil 330 and through which the refrigerant flows. ) is formed, allowing the refrigerant to flow continuously through the second cooling passage 321 and the third cooling passage 331.

In other words, the magnetic flux is concentrated in the core member 200, and an induced current is generated inside the core member 200 like the material to be heated (M), so the core member 200 also heats up like the material to be heated (M). As this occurs, the first coil 310 and the third coil 330 additionally cool the heat generated from the core member 200.

In addition, a fourth coil 340 may be included so that one side is in surface contact with the flat portion 220 and the other side faces one side of the second coil 320.

The fourth coil 340 extends from the reinforcing portion 340a and the reinforcing portion 340a to the inner groove 201, which is formed stepwise to have a relatively large thickness toward the material to be heated (M). It may include a support portion 340b formed with a thickness relatively thinner than the thickness of.

The reinforcement portion 340a is made of silver plating and silver material to increase conductivity to suppress heat generation, and to increase heating efficiency by bringing the current distribution closer to the contact ends 231 and 341.

The support portion 340b may extend toward the inner groove 201 longer than the length of the reinforcement portion 340a. This increases rigidity by maximally dispersing the concentrated stress generated in the process of pressing the reinforcing part 340a toward the heating material M, and assists the cooling function by increasing the surface area.

That is, when power is applied to the power supply units 110 and 120, and current is supplied to the first coil 310, second coil 320, third coil 330, and fourth coil 340, magnetic force is generated. In the process of generating magnetic force toward the plurality of coils formed to correspond to the facing housing, the magnetic force passes laterally through the material to be heated (M). In this process, the material to be heated (M) is heated.

In addition, a space may be provided between the second coil 320 on both sides of the support portion 340b of the fourth coil 340, but the insulating member 230 is extended to connect the fourth coil 340 and the second coil 320. It may be formed to be in close contact between the coils 320. That is, on one side of the support portion 340b, an insulating member 230 is located in close contact between the second coil 320 and the opposing side, and on the other side of the support portion 340b, the insulating member 230 is located between the step portion 221 and the opposing side. A gap (c) formed in may be provided. The gap c can maximize the cooling effect by exchanging heat generated on its surface while a current is formed in the fourth coil 340 with the air flowing through the gap c.

In particular, when the refrigerant discharged through the discharge part 332 is compressed air, the compressed air is discharged through the discharge part 332 and then guided to flow through the gap c, thereby converting the air into room temperature air. In addition, rapid cooling can be performed using the low-temperature refrigerant.

Therefore, according to an induction heating coil that includes core members with different heights and ensures uniform heating in the width direction according to an embodiment of the present invention, the contact end of the coil adjacent to the material to be heated is on one side along the width direction of the material to be heated. Since it is arranged eccentrically at the edge and the end is formed thick, heating performance can be improved by maximizing the magnetic flux density to the heating area.

In addition, durability can be increased by effectively dispersing the load generated at the contact area of the coil member with the heating material.

In addition, durability can be improved by reducing the amount of heat generated by the core member and the coil member itself and preventing core burnout by effectively cooling the heated core member and coil member.

As described above, an induction heating coil that includes core members with different heights and ensures uniform heating in the width direction according to an embodiment of the present invention has been described with reference to the illustrative drawings, but the present invention is similar to the embodiment described above. It is not limited by the drawings, and various implementations can be made by those skilled in the art within the scope of the patent claims.

100: housing
100a: Mounting groove
101: Housing cover
110, 120: power supply unit
130: Refrigerant supply unit
131: Refrigerant inlet
200: core member
200a: opening
201: inner groove
210: bending part
220: Flat part
221: Stepped part
230: Insulating member
231: contact end
300: coil member
310: first coil
311: first cooling passage
320: second coil
321: second cooling passage
330: third coil
331: Third cooling passage
340: fourth coil
340a: reinforcement part
340b: support part
341: contact end
C: gap

Claims (7)

A material to be heated so that both sides are heated and laminated;
A pair of coil members arranged to be spaced apart from each other on both sides of the heating material and protruding close to one side facing the heating material; and
A core member formed in close proximity along one surface of each of the protruding coil members and penetrating the inside of each coil to the housing cover, including core members with different heights, ensures uniform heating in the width direction. Induction heating coil. According to paragraph 1,
Each coil member is wound at least once or more along the inner surface of each inner groove and the outer surface of the core member around each core member. An induction heating coil that includes core members of different heights and ensures uniform heating across the width. According to paragraph 1,
An induction heating coil that ensures uniform heating in the width direction by including a core member with different heights and including a cooling passage formed in a portion of the coil member. According to paragraph 1,
A reinforcement portion formed stepwise to have a large thickness toward the material to be heated; and
It includes a support portion formed with a thickness thinner than the thickness of the reinforcement portion,
An induction heating coil that ensures uniform heating in the width direction by including core members of different heights, which are formed on a portion of the coil member and include silver material or silver plating. According to paragraph 1,
The core member is an induction heating coil that ensures uniform heating in the width direction by including core members of different heights and including a gap spaced apart to form a cooling air flow path. According to paragraph 1,
An induction heating coil that ensures uniform heating in the width direction, including core members with different heights and including an insulating member formed to surround a core member adjacent to a protruding portion of the coil member. According to paragraph 1,
An induction heating coil that ensures uniform heating in the width direction by including a core member with different heights, including a power supply terminal and a refrigerant supply unit formed at one end along the longitudinal direction of the coil member.

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