JP2016115614A - Induction heating coil unit and induction heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an induction heating coil unit capable of being miniaturized furthermore and capable of reducing the generation of eddy current, and an induction heating device.SOLUTION: An induction heating coil unit La of the present invention includes first and second coils 1-1, 1-2 arranged in an axial direction with an interval therebetween and a yoke allowing a magnetic flux generated by the coils to pass therethrough. Each of the first and second coils 1-1, 1-2 is configured such that a strip-like conductor member with a thickness equal to or less than a skin depth corresponding to a drive frequency is coiled in a manner so that the widthwise direction thereof goes along the axial direction thereof. The yoke includes: first and second yoke parts 2-1, 2-2 which are arranged on each outside of the first and second coils 1-1, 1-2 in the axial direction, respectively; third yoke parts 2-31, 2-32 coupling the yoke parts 2-1, 2-2; and first and second projecting magnetic poles 2-41, 2-42 projectingly provided in the first and second yoke parts 2-1, 2-2, respectively, so as to extend into each core of the first and second coils 1-1, 1-2, respectively.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an induction heating coil unit for induction heating of an object to be heated and an induction heating apparatus using the induction heating coil unit.

  2. Description of the Related Art Conventionally, induction heating apparatuses are known in which an eddy current is generated in a heated object by applying an alternating magnetic field to the heated object, and the heated object is heated by Joule heat of the eddy current. In this induction heating apparatus, a coil is usually used to generate the alternating magnetic field. When a relatively large member such as a steel plate is heated by the induction heating device, for example, a high frequency high current having a frequency of several kHz and a current of several hundred amperes needs to be applied to the coil. When such a high frequency high current is passed through the coil, the coil itself generates heat due to its Joule heat. For this reason, it is necessary to cool the coil. For example, as disclosed in Patent Document 1, Patent Document 2, and the like, a coil is usually formed by winding a copper pipe called a hollow conductor. The coil is cooled by circulating the cooling water.

  The induction heating inductor disclosed in Patent Document 1 includes an iron core disposed oppositely through a gap and a coil wound around the iron core, and a device for heating by inserting a material to be heated into the gap. In this case, an annular conductor that is wound at least once through an insulator is provided on a part of the iron core, and a magnetic structure that uses a surrounding metal structure as a part of the magnetic path A magnetic force is generated, and the aim is to suppress leakage magnetic flux. And the said annular conductor is a hollow copper pipe, The inside is water-cooled.

  Further, the high efficiency heating coil for induction heating disclosed in Patent Document 2 is a heating coil of an induction heating device used for heating a metal, and at least a portion of the meat corresponding to the inner circumference of the hollow conductor for the coil. The thickness is selected to be about twice or more than the current penetration depth, thereby aiming at suppression of eddy current.

Japanese Utility Model Publication No. 62-152392 JP 2005-150066 A

  However, when a coil is formed of a copper tube in this way, since the copper tube itself has a large diameter because it is hollow, the coil is also enlarged.

  Further, when the object to be heated is a magnetic metal, when the object to be heated approaches its Curie temperature, its magnetic permeability decreases rapidly. For this reason, since the magnetic resistance of the magnetic circuit including the path through the object to be heated also increases abruptly, a leakage magnetic flux that passes through the coil arranged in the vicinity of the magnetic circuit is generated. Due to this leakage magnetic flux, an eddy current is also generated in the coil conductor itself, and the coil generates heat due to the Joule heat. Therefore, loss occurs and heating efficiency is reduced.

  In Patent Document 1, although leakage magnetic flux can be suppressed, an eddy current flowing through the laid annular conductor generates heat, which deteriorates efficiency and requires a cooling method. In Patent Document 2, although the thickness of the coil conductor is reduced to the penetration thickness and the eddy current is suppressed by limiting the region through which the eddy current flows, the magnetic flux lines still penetrate the conductor surface vertically. The effect is about 10 to 20% and does not lead to an essential suppression.

  The present invention has been made in view of the above-described circumstances, and an object thereof is an induction heating coil unit that can be further miniaturized and can reduce generation of eddy currents, and an induction heating apparatus using the induction heating coil. Is to provide.

  As a result of various studies, the present inventor has found that the above object is achieved by the present invention described below. That is, the induction heating coil unit according to one aspect of the present invention includes a pair of first and second coils arranged at predetermined intervals in the axial direction, and magnetic flux generated by the first and second coils. The first and second coils each have a strip-like conductor member having a thickness equal to or less than the skin depth corresponding to the driving frequency, so that the width direction of the conductor member is along the axial direction. The yoke is disposed on the outer side in the axial direction of the second coil and the first yoke portion disposed on the outer side in the axial direction of the first coil. The second yoke portion, the third yoke portion connecting the first yoke portion and the second yoke portion, and the first yoke portion so as to extend into the first core portion of the first coil. First salient magnet And parts, characterized in that it comprises a second 突磁 pole part projecting from the said second yoke portions so as to extend into the second core of the second coil. In this induction heating coil unit, preferably, the third yoke portion is a pair of first and second connecting yoke members that connect the first yoke portion and the second yoke portion at both ends thereof, The induction heating coil unit is an H-type transverse apparatus. In the induction heating coil unit, preferably, the third yoke portion is one third connecting yoke member that connects the first yoke portion and the second yoke portion at one end thereof, The induction heating coil unit is a C-type lance verse type device.

  In such an induction heating coil unit, a strip-shaped conductor member having a thickness equal to or less than the skin depth corresponding to the driving frequency is wound through an insulating member so that the width direction of the conductor member is along the axial direction of the coil. Since the first and second coils configured by turning are provided, the size (thickness) of the conductor member itself in the radial direction is reduced, and further miniaturization becomes possible. Each of the first and second coils includes first to third yoke portions so-called flatwise so as to include first and second salient pole portions in the first and second core portions, respectively. The induction heating coil unit disposed in the yoke is a so-called transverse type. For this reason, the first yoke part (or the second yoke part) exits substantially vertically (out along the axial direction) and enters the second yoke part (or first yoke part) substantially vertically (the axial direction). The leakage magnetic flux line (entered along the line) is parallel to the width direction in the first and second coils (along the width direction), and the eddy current generated in a thin conductor member having a thickness less than the skin depth is reduced. It becomes possible.

  According to another aspect, in the above-described induction heating coil unit, the first yoke portion is shaped to cover a part of one end surface in the axial direction of the first coil, and the second yoke portion is The shaft has a shape covering a part of the other end surface in the axial direction of the second coil, and the first coil is included in a predetermined turn in a portion not covered by the first yoke portion. A first through passage penetrating in the direction, and the second coil having a second through passage penetrating in the axial direction included between predetermined turns in a portion not covered by the second yoke portion. It is characterized by that.

  In such an induction heating coil unit, the first and second coils have first and second through passages that are included between predetermined turns and penetrate in the axial direction. Each of the first and second through paths may be one or more in one coil, may be provided every turn (one turn), may be provided every several turns, or random. May be provided for each turn. By such a 1st penetration path, the part (contact part) which contact | connects the 1st penetration path in a strip | belt-shaped conductor member can also have a heat dissipation function, and can also be utilized as a heat sink. Similarly, the part (contact part) which contact | connects the 2nd penetration path in a strip | belt-shaped conductor member by such a 2nd penetration path can also have a heat dissipation function, and can also be utilized as a heat sink. And since a conductor member is also a good heat conductor excellent in heat conductivity generally, the heat of each remaining part (each remaining part) except the said each contact part in a 1st and 2nd coil is each said Heat can be transferred to the contact portion, and heat can be radiated at each contact portion. In particular, the heat generated in the core side portions (inner radial portions) of the first and second coils is generally difficult to dissipate. However, in the induction heating coil unit, the inner radial portions are preferably used. Heat can be conducted to the contact portions by the strip-shaped conductor member, and heat can be radiated by the contact portions.

  From the viewpoint of providing the heat dissipation function, in the above-described induction heating coil unit, preferably, each of the first and second through passages has a longer length in the circumferential direction than a length in the radial direction. . Preferably, in the above-described induction heating coil unit, each of the first and second through passages has a predetermined radial distance in the uncovered portion when the conductor member is wound. It is formed by winding. In such an induction heating coil unit, the area of the strip-shaped conductor member that contacts the first and second through passages becomes larger, and a larger amount of heat can be radiated.

  In another aspect, the above-described induction heating coil unit has a first refrigerant passage portion that forms a refrigerant passage for allowing the refrigerant to flow through the first through passage, and the refrigerant flows through the second through passage. And a second refrigerant passage portion in which a refrigerant passage is formed.

  Since such an induction heating coil unit includes the first and second refrigerant passage portions, forced cooling can be performed by circulation of the refrigerant, and cooling can be performed efficiently.

  An induction heating apparatus according to another aspect of the present invention includes any one of the above-described induction heating coil units, and a power source that supplies electric power of the driving frequency to each of the first and second coils. It is characterized by that.

  According to this, the induction heating apparatus using any of the above-described induction heating coil units is provided. Since the induction heating apparatus uses any one of the above-described induction heating coil units, the induction heating device can be further downsized and the generation of eddy currents can be reduced.

  The induction heating coil unit according to the present invention can be further reduced in size and generation of eddy currents can be reduced. And according to this invention, the induction heating apparatus using this coil unit for induction heating can be provided.

It is a figure which shows the structure of the coil unit for induction heating in 1st Embodiment. It is a figure which shows the relationship between the frequency in each metal used as a to-be-heated material, and skin depth. It is a figure which shows the relationship between the temperature and skin depth in SPCC-pure iron system. It is a figure which shows the structure of the coil unit for induction heating in 2nd Embodiment. It is a figure which shows the structure of the induction heating apparatus in 3rd Embodiment.

  Hereinafter, an embodiment according to the present invention will be described with reference to the drawings. In addition, the structure which attached | subjected the same code | symbol in each figure shows that it is the same structure, The description is abbreviate | omitted suitably. In this specification, when referring generically, it shows with the reference symbol which abbreviate | omitted the suffix, and when referring to an individual structure, it shows with the reference symbol which attached the suffix.

  The induction heating coil unit according to the embodiment generates an eddy current in the heated object by applying an alternating magnetic field to the metal heated object, and heats the heated object by the Joule heat of the eddy current. It is a coil apparatus used for. The induction heating coil unit is, for example, a transverse type that generates a magnetic field (magnetic field) substantially perpendicular to the surface of the object to be heated. As an example, in the first embodiment, an H type induction heating type is used. The coil unit La will be described, and as another example, a C-type induction heating type coil unit Lb will be described in the second embodiment. The induction heating apparatus IH using the induction heating coil units La and Lb in the first and second embodiments will be described in the third embodiment.

(First embodiment)
FIG. 1 is a diagram illustrating a configuration of a coil unit for induction heating in the first embodiment. FIG. 1A is a top view as viewed from the axial direction, the upper right side of the diagonal is a normal top view, and the lower left side of the diagonal is IV shown in FIG. 1C. It is a top view (cross-sectional view) in a -IV cross section. FIG. 1B is a first longitudinal sectional view, the right half of which is a longitudinal sectional view taken along the line II of FIG. 1A, and the left half of FIG. It is a longitudinal section in the II-II section line shown. FIG. 1C is a second cross-sectional view taken along the line III-III shown in FIG. In FIG. 1C, the supply units 3-12 and 3-42 and the discharge units 3-23 and 3-33 are indicated by phantom lines in order to show supply and discharge of the refrigerant to each refrigerant passage unit. Has been. FIG. 2 is a diagram showing the relationship between the frequency and the skin depth in each metal used as an object to be heated. The horizontal axis in FIG. 2 indicates the drive frequency, and the vertical axis indicates the skin depth (skin depth, skin thickness) expressed in mm. FIG. 3 is a diagram showing the relationship between the temperature and the skin depth in the SPCC to pure iron system. The horizontal axis of FIG. 3 shows the temperature expressed in ° C., and the vertical axis shows the skin depth expressed in mm.

  As described above, the induction heating coil unit La in the first embodiment is an H-type transverse induction heating coil unit. For example, as shown in FIG. 1, the first and second coils 1-1 are used. 1 and the yoke 2 (2-1, 2-2, 2-31, 2-32, 2-41, 2-42). In the example shown in FIG. 2 Refrigerant passage portions 3-1 (3-11-13-3), 3-2 (3-21-3-23); 3-3 (3-31-3-33), 3-4 (3-41) ~ 3-43).

  As shown in FIGS. 1B and 1C, the first and second coils 1-1 and 1-2 are arranged at a predetermined interval in the axial direction. Since the first and second coils 1-1 and 1-2 have the same shape, they are collectively described as the coil 1 when it is not necessary to distinguish between them.

  The coil 1 is configured by winding a strip-shaped conductor member via an insulating member so that the width direction of the conductor member is along the axial direction. More specifically, the coil 1 winds a strip-like long conductor member (or a strip-like long conductor member covered with insulation) that is overlapped with an insulating material (not shown) a predetermined number of times. Consists of. Such a strip-like long conductor member has a sheet shape, a ribbon shape or a tape shape, and a thickness (length in the thickness direction, length in the thickness direction, radial direction) with respect to the width (length in the width direction, length in the axial direction) W. Length) t is less than 1 (0 <t / W <1). As shown in FIG. 1A, the coil 1 of the example shown in FIG. 1 has an outer shape that is substantially rectangular (rectangular) and has rounded corners in a plan view viewed from the axial direction. And the core part is wound so that it may become a substantially square by planar view. The coil 1 will be described in more detail later.

  The yoke 2 is a member that passes the magnetic flux generated by the first and second coils 1-1 and 1-2. For example, in the example illustrated in FIG. 1, the yoke 2 includes a first yoke part 2-1, a second yoke part 2-2, a third yoke part 2-3 (2-31 and 2-32), 1 salient pole part 2-41 and 2nd salient pole part 2-42 are provided.

  As shown in FIG. 1B, the first yoke part 2-1 is a member arranged on the outer side (upper side) in the axial direction of the first coil 1-1. As shown in FIG. 1B, the second yoke part 2-2 is a member arranged on the outer side (lower side) in the axial direction of the second coil 1-2. That is, each of the first and second yoke portions 2-1 and 2-2 is a pair of first and second coils 1-1, 1 arranged to face each other with a predetermined interval in the axial direction. -2 on the both outer sides (upper and lower sides) in the axial direction. As shown in FIGS. 1A and 1B, the first and second yoke portions 2-1 and 2-2 are members of the same shape and a relatively thin substantially rectangular parallelepiped (substantially plate shape). The third yoke part 2-3 is a member that connects the first yoke part 2-1 and the second yoke part 2-2. In the example shown in FIG. 1, the first yoke part 2-1 and the second yoke are provided. A pair of first and second connecting yoke members 2-31 and 2-32 are provided to connect the portion 2-2 at both ends thereof. As shown in FIG. 1B, the first and second connecting yoke members 2-31 and 2-32 are the same shape as each other and are relatively thin and substantially rectangular parallelepiped members. That is, one end portion of the first connecting yoke member 2-31 is connected to one end portion of the first yoke portion 2-1, so as to be orthogonal to the first yoke portion 2-1, and the first yoke portion 2-1. One end portion of the second connecting yoke member 2-32 is connected to the other end portion of the second connecting yoke member 2-32 so as to be orthogonal to the other end portion. Then, the other end portion of the first connecting yoke member 2-31 is connected to one end portion of the second yoke portion 2-2 so as to be orthogonal (hanging down), and the second yoke portion 2-2 is connected. The other end portion of the second connecting yoke member 2-32 is connected to the other end portion of the second connecting yoke member 2-32 so as to be orthogonal to the other end portion. As a result, the first to third yokes 2-1 to 2-3 have a cylindrical shape (hollow column shape) having a rectangular parallelepiped cross section, and the first and second coils 1- and 1- are opposed to each other in the inner space. 1, 1-2 are arranged.

  Then, as shown in FIG. 1B, the first salient pole portion 2-41 projects on the inner surface of the first yoke portion 2-1 so as to extend into the first core portion of the first coil 1-1. Established. The outer shape of the first salient pole portion 2-41 has a shape corresponding to the shape of the first core portion of the first coil 1-1. In the example shown in FIG. 1, as described above, the first coil 1-1 has a substantially square shape whose first core portion is chamfered in a plan view. As shown to 1 (A), it is a substantially square with the external shape slightly chamfered by planar view slightly smaller than the said 1st core part. More specifically, the first salient pole portion 2-41 has the length substantially equal to the length in the short direction (width length) of the first yoke portion 2-1, and is substantially square in plan view. . The height of the first salient pole portion 2-41 (the length in the axial direction) is substantially the same as the width of the conductor member in the first coil 1-1. Therefore, the first coil 1-1 is a cored coil having the first salient pole part 2-41 in the first core part.

  Similarly, as shown in FIG. 1B, the second salient pole portion 2-42 is formed on the inner surface of the second yoke portion 2-2 so as to extend into the second core portion of the second coil 1-2. Projected. The outer shape of the second salient pole portion 2-42 has a shape corresponding to the shape of the second core portion of the second coil 1-2. In the example shown in FIG. 1, since the second coil 1-2 has the same shape as the first coil 1-1 as described above, the second salient pole part 2-42 is the first salient pole part 2-41. As shown in FIG. 1A, the outer shape is slightly smaller than the second core portion, and the outer shape is a substantially square chamfered in plan view. More specifically, the second salient pole part 2-42 has a length substantially equal to the length in the short direction (width length) of the second yoke part 2-2 and is substantially square in plan view. . The height (axial length) of the second salient pole portion 2-42 is substantially the same as the width of the conductor member in the second coil 1-2. Therefore, the second coil 1-2 is a cored coil having the second salient pole portion 2-42 in the second core portion.

  As shown in FIGS. 1B and 1C, the surfaces of the first and second salient pole portions 2-41 and 2-42 are flat surfaces orthogonal to the axial direction. They are opposed to each other with a predetermined interval. In addition, each edge (each ridge line part) in each surface of the 1st and 2nd salient pole parts 2-41 and 2-42 is chamfered.

  Such a yoke 2 is formed of a predetermined magnetic material. For example, the yoke 2 is formed by laminating a plurality of thin steel plate (for example, 0.5 mm or less) electromagnetic steel plates in a direction orthogonal to the axial direction. For example, the yoke 2 is formed by heat-press molding soft magnetic powder. The soft magnetic powder is a ferromagnetic metal powder. More specifically, for example, pure iron powder, iron-based alloy powder (Fe-Al alloy, Fe-Si alloy, Sendust, Permalloy, etc.) and amorphous powder are used. Furthermore, iron powder (for example, a diameter of 50 μm or less) having an electrical insulating film such as a phosphoric acid-based chemical film formed on the surface thereof can be used. These soft magnetic powders can be produced by a known means, for example, a method of making fine particles by an atomizing method or the like, a method of finely pulverizing iron oxide or the like and then reducing it. For example, the yoke 2 may integrally form the first to third yoke portions 2-1 to 2-3 and the first and second salient pole portions 2-41 and 2-42. Further, for example, the yoke 2 is formed by bonding and fixing the first to third yoke portions 2-1 to 2-3 and the first and second salient pole portions 2-41 and 2-42, for example. good. Further, for example, the yoke 2 is formed by integrating a part of the first to third yoke portions 2-1 to 2-3 and the first and second salient pole portions 2-41 and 2-42, and the remaining portions thereof. May be formed by, for example, bonding and fixing each other. For example, the cross section substantially E in which the first yoke part 2-1, the part of the first connecting yoke member 2-31, the part of the second connecting yoke member 2-32, and the first salient pole part 2-41 are integrally formed. The upper yoke portion, the second yoke portion 2-2, the remaining portion of the first connecting yoke member 2-31, the remaining portion of the second connecting yoke member 2-32, and the second salient pole portion 2-42 are integrally formed. The yoke 2 is formed by, for example, bonding and fixing the lower yoke portion having a substantially E-shaped cross section to each other.

  Such a yoke 2 is a so-called transverse type, and a magnetic field (magnetic flux) generated by energizing the first and second coils 1-1 and 1-2 is as shown in FIG. For example, the first yoke portion 2-1, the first connecting yoke member 2-41, the second yoke portion 2-2, and the second yoke portion 2-1 are arranged so as to be parallel to the axial direction from the first salient pole portion 2-41. It protrudes from the second salient pole part 2-42 via the salient pole part 2-42 so as to be parallel to the axial direction, and passes through the space between the first and second salient pole parts 2-41, 2-42. The return yoke forms a magnetic path (magnetic circuit) that enters the first salient pole portion 2-41 again.

  And in this embodiment, the 1st yoke part 2-1 is a shape which coat | covers a part of one end surface of the axial direction in the 1st coil 1-1, and the 2nd yoke part 2-2 is the 2nd coil 1 in the shape. -2 is a shape covering a part of the one end face in the axial direction. More specifically, in the first and second yoke portions 2-1 and 2-2 having the same shape, the length in the short direction out of the lengths in the long direction and the short direction that are orthogonal to the axial direction and orthogonal to each other. The length (width length) is shorter than the length of the outer shape of the first and second coils 1-1 and 1-2 having the same shape. More specifically, in the example shown in FIG. 1, the length in the short direction (the length of the width) of the first and second yoke portions 2-1 and 2-2 is the first and second coils 1-1, It is substantially the same as the length of the core of 1-2 or slightly longer than the length of the core.

  The coil 1 (first coil 1-1, second coil 1-2) will be further described. The conductor member of the coil 1 in this embodiment has a thickness equal to or less than the skin depth corresponding to the driving frequency. FIG. 2 shows the relationship between the frequency and the skin depth for each metal. Each straight line in FIG. 2 is the relationship of γ iron at 800 ° C., brass at 800 ° C., copper at 800 ° C., aluminum at 25 ° C., copper at 25 ° C., and α iron at 25 ° C. in order from top to bottom. . FIG. 3 shows the relationship between the temperature and the skin depth in the SPCC to pure iron system. This pure iron-based Curie temperature Tc is 768 ° C. When the object to be heated is a plate-shaped iron material and is heated to a temperature equal to or higher than the Curie temperature Tc, for example, 800 ° C. at a driving frequency of 1 kHz or higher, for example, the copper conductor member preferably has a thickness of 2 mm from FIG. It is as follows. For example, the conductor member made of aluminum preferably has a thickness of 3 mm or less from FIG. These copper (Cu) and aluminum (Al) are metal materials having a relatively low resistivity and a relatively high thermal conductivity, and are suitable as a strip-shaped conductor member from the viewpoint of conductivity and thermal conductivity. . Therefore, in these cases, by setting the thickness to 2 mm or less, the conductor member of the coil 1 has a thickness of skin depth or less corresponding to the driving frequency of 1 kHz. And when supplying the alternating current power of 1 kHz of drive frequency to the coil 1 formed with such a conductor member which is 2 mm or less in thickness and carrying out induction heating, the to-be-heated material of iron material is preferably 0 from FIG. The thickness is 5 mm or more. When such an iron material to be heated is inductively heated, the iron material to be heated, which is a ferromagnetic material at room temperature, reaches the vicinity of the Curie temperature Tc and loses magnetism. When magnetism is lost, the magnetic resistance of the magnetic path passing through the first and second salient poles increases rapidly, and the magnetic flux leaks to the first and second coils 1-1 and 1-2. In the present embodiment, as described above, the first and second coils 1-1 and 1-2 are so-called flatwise formed of a strip-shaped conductor member having a thickness equal to or less than the skin depth corresponding to the driving frequency. Therefore, since the leaked leakage magnetic flux passes through the conductor member substantially along the width direction (axial direction), and further has a skin depth or less, eddy current is less likely to be generated inside the conductor member. The loss can be reduced. Furthermore, inductive heating of the iron object to be heated generally causes temperature non-uniformity, but the magnetic flux can leak to the first and second coils 1-1 and 1-2 at the edge of the object to be heated. This means that the region where the Curie temperature is reached can move to the region where the magnetism remains (the region where the magnetic resistance is low) without reaching the Curie temperature. It can be heated uniformly.

  In the present embodiment, the first coil 1-1 includes the first through passage 4-1 that penetrates in the axial direction and is included between predetermined turns in a portion that is not covered by the first yoke portion 2-1. The second coil 1-2 has a second through passage 4-2 that penetrates in the axial direction and is included between predetermined turns in a portion not covered by the second yoke portion 2-2. That is, the coil 1 (the first coil 1-1 and the second coil 1-2) has a predetermined interval in the radial direction at a portion not covered by the first and second yoke portions 2-1 and 2-2. A belt-shaped conductor member is formed by winding it through an insulating member so that the width direction of the conductor member is along the axial direction so as to be vacant. In other words, the coil 1 is axially wound in a coil shape so as to have a predetermined interval in the radial direction at a portion not covered by the first and second yoke portions 2-1 and 2-2. A long strip-shaped conductor member whose width is longer than the thickness in the radial direction, and an insulating member disposed between the turns of the strip-shaped conductor member wound in the coil shape. Each of the first and second through passages 4-1 and 4-2 has a length in the direction along the circumferential direction that is longer than a length along the radial direction. In the present embodiment, in the present embodiment, the first through passage 4-1 has both sides with respect to the first yoke portion 2-1 in the first coil 1-1 having an outer rectangular shape in plan view (see FIG. 1A). And in the example shown to (C), it forms in the both-sides part which is not coat | covered with the 1st yoke part 2-1. In the present embodiment, in the present embodiment, the second through-path 4-2 is opposite to the second yoke portion 2-2 in the outer rectangular second coil 1-2 as described above in plan view (FIG. 1A). And in the example shown to (C), it forms in the both-sides part which is not coat | covered with the 2nd yoke part 2-2 on the paper surface left side and paper surface right side.

  The first through passage 4-1 may be one or a plurality of the first coil 1-1, may be provided every turn, may be provided every several turns, or may be a random turn. It may be provided for each. Similarly, the second through path 4-2 may be one or more in one second coil 1-2, may be provided every turn, may be provided every several turns, and May be provided for each random turn. In the example shown in FIG. 1, each of the first and second through passages 4-1 and 4-2 is provided for each turn.

  In the first and second coils 1-1 and 1-2, the first and second yoke portions 2-1 and 2-2 formed the first and second through passages 4-1 and 4-2. From the viewpoint of miniaturization, the conductor members are in close contact with each other through the insulating material in the portions other than the uncovered portions, for example, the portions covered by the first and second yoke portions 2-1 and 2-2. Is wound. As a result, the effective sectional areas of the first and second coils 1-1 and 1-2 can be secured in the internal space of the yoke 2 with a high occupation rate.

  Further, a shape maintaining member (spacer) for maintaining the shape of the first through passage 4-1 may be disposed in each first through passage 4-1, and each second through passage is similarly provided. In 4-2, the shape maintenance member (spacer) for maintaining the shape of the 2nd penetration way 4-2 may be arranged.

  The first refrigerant passage portions 3-1 (3-11-1 to -13) and 3-2 (3-21 to 3-23) form a refrigerant passage for allowing the refrigerant to flow through the first through passage 4-1. The first refrigerant passage portions 3-1 and 3-2 are arranged on one side of the first coil 1-1 with respect to the first yoke portion 2-1 (examples shown in FIGS. 1A and 1C). The first a refrigerant passage section 3-1 having a refrigerant passage for allowing the refrigerant to flow through the portion of the first through passage 4-1 that is not covered by the first yoke section 2-1 on the left side of the drawing), The first portion of the coil 1-1 that is not covered by the first yoke portion 2-1 on the other side of the first yoke portion 2-1 in the coil 1-1 (the right side of the drawing in the examples shown in FIGS. 1A and 1C). And a first-b refrigerant passage portion 3-2 having a refrigerant passage for circulating the refrigerant in the through passage 4-1.

  The first-a refrigerant passage portion 3-1 communicates with a hollow rectangular parallelepiped (box-shaped) first-a refrigerant passage portion main body 3-11 and the internal space of the first-a refrigerant passage portion main body 3-11, and the first-a refrigerant passage portion 3-1. A cylindrical 1a supply unit 3-12 formed so as to stand upright on the upper surface of the main part 3-11 and an internal space of the 1a refrigerant passage part main body 3-11, and a 1a refrigerant passage part main body 3-11 and a cylindrical 1a discharger 3-13 formed to stand on the upper surface of 3-11. The first a refrigerant passage 3-1 is on the first yoke portion 2 on one side (the left side in the example shown in FIGS. 1A and 1C) with respect to the first yoke portion 2-1 in the first coil 1-1. -1 enters the internal space at one end of the side surface of the 1a refrigerant passage main body 3-11, and from the internal space at the other end of the side surface through the internal space. It attaches to the 1st coil 1-1 so that it may come out. The part where the first coil 1-1 enters and exits the first-a refrigerant passage body 3-11 is formed watertight by a sealing member such as a resin. Similarly, the 1b refrigerant passage portion 3-2 communicates with a hollow rectangular parallelepiped (box shape) first b refrigerant passage portion main body 3-21 and an internal space of the first b refrigerant passage portion main body 3-21. A cylindrical 1b supply portion 3-22 formed to stand on the lower surface of the 1b refrigerant passage portion main body 3-21 and an internal space of the 1b refrigerant passage portion main body 3-21 to communicate with the first b refrigerant And a cylindrical first b discharge portion 3-23 formed so as to stand on the lower surface of the passage portion main body 3-21. The first b refrigerant passage 3-2 is located on the other side of the first coil 1-1 in the first coil 1-1 (on the right side in the drawing in the example shown in FIGS. 1A and 1C). -1 enters the internal space at one end of the side surface of the 1b refrigerant passage section main body 3-21 and passes through the internal space from the internal space at the other end of the side surface. It attaches to the 1st coil 1-1 so that it may come out. The part where the first coil 1-1 enters and exits the first b refrigerant passage main body 3-21 is formed watertight by a sealing member such as a resin.

  The second refrigerant passage portions 3-3 (3-31 to 3-33) and 3-4 (3-41 to 3-43) form a refrigerant passage for allowing the refrigerant to flow through the second through passage 4-2. The second refrigerant passage portions 3-3 and 3-4 are on one side of the second coil 1-2 with respect to the second yoke portion 2-2 (examples shown in FIGS. 1A and 1C). 2a refrigerant passage section 3-3 in which a refrigerant passage is formed to circulate the refrigerant through the second through passage 4-2 in a portion not covered by the second yoke section 2-2 on the left side of the drawing), A second portion of the coil 1-2 that is not covered by the second yoke portion 2-2 on the other side of the second yoke portion 2-2 with respect to the second yoke portion 2-2 (the right side of the drawing in the examples shown in FIGS. 1A and 1C). And a second b refrigerant passage portion 3-4 having a refrigerant passage for allowing the refrigerant to flow through the through passage 4-2.

  The second-a refrigerant passage portion 3-3 communicates with a hollow rectangular parallelepiped (box-shaped) second-a refrigerant passage portion main body 3-31 and the internal space of the second-a refrigerant passage portion main body 3-31. A cylindrical 2a supply portion 3-32 formed to stand on the upper surface of the portion main body 3-31 and an internal space of the 2a refrigerant passage portion main body 3-31. And a cylindrical second 2a discharge portion 3-33 formed so as to stand on the upper surface of 3-31. The second-a refrigerant passage 3-3 is located on one side of the second coil 1-2 with respect to the second yoke part 2-2 (on the left side in the example shown in FIGS. 1A and 1C). -2 is part of the side of the 2a refrigerant passage part main body 3-31 and enters the internal space at the other end of the side through the internal space. It attaches to the 2nd coil 1-2 so that it may come out. The part where the second coil 1-2 enters and exits the 2a refrigerant passage part main body 3-31 is formed watertight by a sealing member such as a resin. Similarly, the second b refrigerant passage portion 3-4 communicates with the hollow rectangular parallelepiped (box shape) second b refrigerant passage portion main body 3-41 and the internal space of the second b refrigerant passage portion main body 3-41, and The 2b refrigerant passage portion main body 3-41 is connected to the cylindrical second b supply portion 3-42 standing on the lower surface of the refrigerant passage portion main body 3-41 and the internal space of the second b refrigerant passage portion main body 3-41. And a cylindrical second b discharge portion 3-43 formed so as to stand on the lower surface of the passage portion main body 3-41. The second b refrigerant passage 3-4 is located on the other side of the second coil 1-2 with respect to the second yoke portion 2-2 (the right side in the drawing in the example shown in FIGS. 1A and 1C). -2 enters the internal space at one end of the side surface of the second-b refrigerant passage section main body 3-41, and from the internal space at the other end of the side surface through the internal space. It attaches to the 2nd coil 1-2 so that it may come out. The part where the second coil 1-2 enters and exits the second b refrigerant passage section main body 3-41 is formed watertight by a sealing member such as a resin.

  The portion where the first coil 1-1 enters and exits the 1a refrigerant passage portion main body 3-11 or the 1b refrigerant passage portion main body 3-21 and the second coil 1-2 is the 2a refrigerant passage portion main body 3-. 31 or 2b refrigerant passage part main body 3-41, instead of forming a watertight with a sealing member such as resin, for example, the 1a refrigerant passage part main body 3-11 and the 1b refrigerant passage part main body 3-21 Or the 2a refrigerant passage portion main body 3-31 and the 2b refrigerant passage portion main body 3-41 are connected to each other by a rectangular pipe made of a non-conductive and non-magnetic material, and the first coil 1 fills the inner space. -1 or a second structure of the refrigerant passage housing the second coil 1-2. Since it is not easy in construction to individually form the coil conductors with a sealing member such as a resin, this structure is more practical. In that case, the rectangular pipe does not expect the refrigerant to flow through the narrow space between the inner space, the coil wire and the pipe wall, but merely serves to ensure water-tightness against the refrigerant.

  In such an induction heating coil unit La, when AC power having a driving frequency of 1 kHz, for example, is supplied to the first and second coils 1-1 and 1-2, the magnetic flux indicated by the one-dot chain line in FIG. An alternating magnetic field (alternating magnetic field) is generated. In this state, when an object to be heated WK that is, for example, an iron material and has, for example, a plate shape, a rod shape, a line shape, and the like is disposed in the space between the first and second salient pole portions 2-41 and 2-42. The magnetic flux passes through the article to be heated WK. For this reason, an eddy current is generated in the heated object WK by the alternating magnetic field, and the heated object WK is induction-heated by the Joule heat of the eddy current. When a leakage magnetic flux is generated during the induction heating, the first yoke part 2-1 (or the second yoke part 2-2) exits from the first yoke part 2-1 (or the second yoke part 2-2) substantially vertically (out along the axial direction (in parallel)). The leakage magnetic flux lines entering the two yoke portions 2-2 (or the first yoke portion 2-1) substantially perpendicularly (entering along (in parallel with) the axial direction) the first and second coils 1-1, -2 passes through the conductor member substantially along the width direction (axial direction) in each of them, and further has a skin depth or less, so that eddy currents hardly occur inside the conductor member, and the loss can be reduced.

  Even when the first and second coils 1-1 and 1-2 are heated, the first coil 1-1 has the first through passage 4-1. A portion (contact portion) in contact with the first through passage 4-1 in the strip-shaped conductor member of the first coil 1-1 can also have a heat dissipation function by the first through passage 4-1, and also as a heat dissipation plate. Available. For this reason, the first coil 1-1 can dissipate heat at the contact portion, and the temperature rise can be suppressed. Similarly, the second coil 1-2 has a second through path 4-2. The part (contact part) which touches the 2nd penetration path 4-2 in the strip | belt-shaped conductor member in the 2nd coil 1-2 by the 2nd penetration path 4-2 can also give a heat dissipation function, and also as a heat sink Available. For this reason, the second coil 1-2 can dissipate heat at the contact portion, and the temperature rise can be suppressed. In particular, the heat generated in the core side portions (the radially inner portions) of the first and second coils 1-1 and 1-2 is generally difficult to dissipate, but is suitable for the induction heating coil unit La. In addition, heat of each radially inner portion can be conducted to each contact portion by the strip-shaped conductor member, and can be radiated by each contact portion. In particular, heat conduction can be more suitably achieved by using copper or aluminum as the strip-shaped conductor member. In the induction heating coil unit La described above, the first and second through passages 4-1 and 4-2 have the first and second yoke portions 2-1 and 2-2 when the conductor member is wound. -2 is formed by winding at a predetermined interval in the radial direction in the portion not covered by -2, and the first and second through-passes 4-1 and 4-2 are respectively directions along the circumferential direction. Is longer than the length along the radial direction. For this reason, the area which contacts the 1st and 2nd penetration paths 4-1 and 4-2 in a strip | belt-shaped conductor member becomes larger, and can radiate more heat.

  Further, during the induction heating, in each of the 1a, 1b, 2a, and 2b refrigerant passage parts 3-1 to 3-4, the 1a, 1b, 2a, and 2b supply parts 3-12 to 3-3 are provided. Refrigerant is supplied from 42, and each 1a, 1b, 2a, and 2b discharge part 3- is passed through each 1a, 1b, 2a, and 2b refrigerant passage part main bodies 3-11 to 3-41. The refrigerant is discharged from 13 to 3-43. For this reason, forced cooling becomes possible by circulation of the refrigerant, and cooling can be performed efficiently. As the refrigerant, for example, in the liquid phase, antifreeze-added pure water, nonpolar insulating oil, chlorofluorocarbon-based or non-fluorocarbon organic solvent, liquid nitrogen, liquefied natural gas, etc. are used. Inert gas, hydrogen, helium, nitrogen, argon, chlorofluorocarbon-based or non-fluorocarbon-based gas, etc. are used.

  As described above, the coil unit La for induction heating in the first embodiment has a strip-like conductor member having a thickness equal to or less than the skin depth corresponding to the driving frequency, and the width direction of the conductor member is in the axial direction of the coil. Since the first and second coils 1-1 and 1-2 configured by winding through an insulating member so as to be along are provided, the conductor member itself and the radial size (thickness) thereof are reduced. Further downsizing is possible. Each of the first and second coils 1-1 and 1-2 includes the first and second salient pole portions 2-41 and 2-42 in the first and second core portions, respectively. The induction heating coil unit La is so-called flatwise and disposed in the yoke 2 including the first to third yoke portions 2-1, 2-2, 2-3 (2-31, 2-32). It becomes a transverse type. For this reason, the second yoke part 2-2 (or the second yoke part 2-2) (or the second yoke part 2-2) exits from the first yoke part 2-1 (or the second yoke part 2-2) substantially vertically (out along the axial direction (in parallel)). The leakage magnetic flux line that enters substantially perpendicular to the one yoke part 2-1) (enters along (in parallel with) the axial direction) is parallel to the width direction of each of the first and second coils 1-1 and 1-2. (Along the width direction), it becomes possible to reduce the eddy current generated in the thin conductor member having the skin depth or less. In particular, the eddy current can be reduced as described above even when the object to be heated is a magnetic substance and is heated to a temperature above the Curie temperature and the leakage magnetic flux increases. Therefore, induction heating can be performed efficiently.

  In the above description, the drive frequency is 1 kHz. However, the drive frequency is not limited to this and can be changed as appropriate.

Next, another embodiment will be described.
(Second Embodiment)
FIG. 4 is a cross-sectional view showing the configuration of the induction heating coil unit in the second embodiment. As described above, the induction heating coil unit Lb in the second embodiment is a C-type transverse induction heating coil unit. For example, as shown in FIG. 4, the first and second coils 1-1 are used. 1-2 and the yoke 5 (5-1, 5-2, 5-3, 5-41, 5-42). The first and second coils 1-1 and 1-2 in the induction heating coil unit Lb of the second embodiment are respectively the first and second coils 1-1 in the induction heating coil unit La of the first embodiment. Since this is the same as 1-2, the description thereof is omitted.

  The yoke 5 is a member that allows the magnetic flux generated by the first and second coils 1-1 and 1-2 to pass through similarly to the yoke 2 of the first embodiment. The yoke 5 is, for example, as shown in FIG. The first yoke part 5-1, the second yoke part 5-2, the third yoke part 2-3, the first salient magnetic pole part 5-41, and the second salient magnetic pole part 2-42. In the yoke 2 of the first embodiment, the first and second yoke portions 2-1 and 2-2 are equal along the longitudinal direction on both sides of the first and second salient pole portions 2-41 and 2-42. Although extending in length and connected to each other by a pair of first and second connecting yoke members 2-31 and 2-32 at each end, the yoke 5 of the second embodiment has the first and second yoke portions. 5-1 and 5-2 extend along the longitudinal direction only on one side of the first and second salient pole portions 2-41 and 2-42 (that is, the other side is omitted). The end portions are connected to each other by a third yoke portion 5-3 configured by one third connecting yoke member. Except for this point, the yoke 5 of the second embodiment is the same as the yoke 2 of the first embodiment, and a description thereof will be omitted.

  As in the first embodiment, the induction heating coil unit Lb in the second embodiment is a first in which a refrigerant passage is formed for circulating the refrigerant in the first and second through passages 4-1, 4-2. 1 and a 2nd refrigerant | coolant channel | path part may be provided.

  The induction heating coil unit Lb in the second embodiment has the same function and effect as the induction heating coil unit La in the first embodiment. And the coil unit Lb for induction heating in 2nd Embodiment can induction-heat a part, such as an edge part, of the to-be-heated material WK, as shown in FIG.

Next, another embodiment will be described.
(Third embodiment)
FIG. 5 is a diagram showing a configuration of the induction heating device in the third embodiment. The induction heating device in the third embodiment is a heating device using an induction heating coil unit. Such an induction heating apparatus IH in the third embodiment includes, for example, the induction heating coil unit L (La, Lb) in the above-described first or second embodiment, the first and the second, as shown in FIG. A high-frequency power source PS that supplies power of the driving frequency to each of the second coils 1-1 and 1-2 is provided. The high-frequency power source PS is a circuit that generates a high-frequency large current having a frequency of several kHz and a current of several hundred amperes. This high-frequency large current is sent to the first and second coils 1-1 and 1-2, respectively. Power is supplied.

  Since the induction heating device IH in the third embodiment uses one of the induction heating coil units La and Lb in the first and second embodiments, the induction heating device IH can be further downsized and generate eddy currents. Can be reduced.

  In order to express the present invention, the present invention has been properly and fully described through the embodiments with reference to the drawings. However, those skilled in the art can easily change and / or improve the above-described embodiments. It should be recognized that this is possible. Therefore, unless the modifications or improvements implemented by those skilled in the art are at a level that departs from the scope of the claims recited in the claims, the modifications or improvements are not covered by the claims. To be construed as inclusive.

La, Lb Induction heating coil unit IH Induction heating device PS High frequency power supply 1-1 First coil 1-2 Second coil 2 (2-1, 2-2, 2-31, 2-32, 2-41, 2 -42), 5 (5-1, 5-2, 5-3, 5-41, 5-42) Yoke 3-1 (3-11-1 to -13) 1a refrigerant passage section 3-2 (3- 21-3-33) 1 b refrigerant passage portion 3-3 (3-31-3-33) 2 a refrigerant passage portion 3-4 (3-41-3-43) 2 b refrigerant passage portion 4-1 1st Through-pass 4-2 Second through-passage

Claims (4)

A pair of first and second coils arranged at predetermined intervals in the axial direction;
A yoke for passing magnetic flux generated by the first and second coils,
Each of the first and second coils is formed by winding a strip-shaped conductor member having a thickness equal to or less than the skin depth corresponding to the driving frequency via an insulating member so that the width direction of the conductor member is along the axial direction. Composed by turning
The yoke includes a first yoke portion disposed outside the first coil in the axial direction, a second yoke portion disposed outside the axial direction in the second coil, and the first yoke portion. A third yoke part connecting the second yoke part, a first salient pole part projecting from the first yoke part so as to extend into a first core part of the first coil, and a second coil part An induction heating coil unit comprising: a second salient pole portion protruding from the second yoke portion so as to extend into the second core portion. The first yoke portion has a shape that covers a part of the one end surface in the axial direction of the first coil;
The second yoke portion is shaped to cover a part of the other end surface in the axial direction of the second coil,
The first coil has a first through path penetrating in the axial direction, included between predetermined turns, in a portion not covered by the first yoke portion,
2. The second coil according to claim 1, wherein the second coil has a second through passage that penetrates in the axial direction and is included between predetermined turns in a portion that is not covered by the second yoke portion. Coil unit for induction heating. A first refrigerant passage portion that forms a refrigerant passage for allowing the refrigerant to flow through the first through passage;
The induction heating coil unit according to claim 2, further comprising: a second refrigerant passage portion in which a refrigerant passage for allowing the refrigerant to flow through the second through passage is formed. The induction heating coil unit according to any one of claims 1 to 3,
An induction heating apparatus comprising: a power source that supplies electric power of the driving frequency to each of the first and second coils.

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