JP6713406B2 - Coil bobbin and transformer - Google Patents

Description

The present invention relates to a coil bobbin, a transformer using the coil bobbin, and the like.

As a conventional technique, a coil bobbin provided with a pair of iron core winding portions and a pair of connecting portions for connecting the iron core winding portions at a required interval, and a concave groove on the entire outer circumference, and a concave groove of the coil bobbin A winding formed by winding a conducting wire a required number of times, and a winding iron core formed by winding an electromagnetic steel sheet a required number of times on the iron core winding portion of the coil bobbin, and the outer peripheral surfaces of both side walls of the concave groove of the iron core winding portion. A curved surface having an arcuate cross section has been known (see, for example, Patent Document 1).

JP-A-8-51034 (page 1, FIG. 1, etc.)

When the outer peripheral surfaces of both side walls of the concave groove of the iron core winding portion are curved surfaces having an arcuate cross section, as in the above-described conventional technique, for example, when the electromagnetic steel sheet is wound to provide the iron core, the iron core It is possible to make it difficult for distortion, distortion, and winding disorder to occur.

However, when the outer peripheral surface of both side walls of the concave groove of the portion around which the winding core of the coil bobbin such as the iron core winding portion is wound is a curved surface having an arcuate cross section, the thickness of the portion around which the iron core of the coil bobbin is wound, that is, the winding. The thickness between the surface around which the iron core is wound and the groove for winding the coil becomes non-uniform depending on the part, and there is a part where the thickness is thick. Usually, the coil bobbin is a molded product of resin, but a cavity called a void is apt to occur during molding in the resin in such a thick portion. When a transformer is manufactured using a coil bobbin having such voids, discharge may occur in the voids located between the coil wound around the coil bobbin and the wound iron core. In particular, in a transformer, the coil on the high voltage side is usually wound around a portion close to the inside of the coil bobbin (for example, on the bottom side of the concave groove) in order to improve the insulation, but the coil on the high voltage side of the coil bobbin is wound. If there is a void in the area inside the wound core of the part to be attached, it will be sandwiched between the coil on the high voltage side to which a high voltage such as the power system is applied and the wound core. Discharge is more likely to occur than other parts. When discharge occurs in the void of the coil bobbin as described above, a portion near the void may be rapidly deteriorated, and as a result, the transformer is easily deteriorated, and a high-quality transformer is provided. There was a problem that I could not do it.

Further, if there is a thick portion of the resin, the amount of the resin increases, and the cost increases accordingly.

The present invention has been made to solve the above problems, and suppresses the occurrence of voids in the region of the coil bobbin on the inner side of the winding core of the coil on the high voltage side to improve the quality. An object of the present invention is to provide a low cost coil bobbin and a transformer that can be manufactured.

The coil bobbin of the present invention is a frame-shaped member in which a first groove in which a coil is arranged is provided along the outer periphery, and includes one or more first core regions that are regions arranged inside a wound core. A first frame body having and a frame-shaped member fitted inside the first frame body, a second groove in which the coil is arranged is provided along the outer periphery, and each first iron core region Having a second core region that is a region arranged inside the wound core at a position adjacent to the second core region, at least the cross-sectional shape of the second core region has a shape along the shape of the second groove. The frame body and the second frame body, in a state of being fitted inside the first frame body, the first frame body and the second frame body, the adjacent first iron core region and the second iron core region. And a cylindrical member disposed so as to enclose the coil bobbin.

With such a configuration, by reducing the thickness of the second core region, which is the region inside the winding core of the portion on which the coil on the high-voltage side of the coil bobbin is wound, to reduce the occurrence of voids in the second core region, When used in a container, it is possible to prevent the quality deterioration from occurring due to the discharge generated in the void, and it is possible to improve the quality. In addition, it is possible to reduce the cost by reducing the amount of resin.

Further, in the coil bobbin of the present invention, in the coil bobbin, the second frame body is a coil bobbin having a cross-sectional shape in a region other than the second iron core region along the shape of the second groove.

With this configuration, it is possible to reduce the thickness of the second frame body and suppress the generation of voids, and it is possible to improve the quality.

In the coil bobbin of the present invention, in the coil bobbin, the first frame body is a coil bobbin having a cross-sectional shape that follows the shape of the first groove.

With this configuration, it is possible to reduce the thickness of the first frame body and suppress the occurrence of voids, and it is possible to improve the quality.

The coil bobbin of the present invention is the coil bobbin, wherein the second groove has a step shape in the width direction.

With such a configuration, even when it has a step shape, it is possible to reduce the thickness of at least the second frame body in the second iron core region to suppress the occurrence of voids and improve the quality.

The coil bobbin of the present invention is the coil bobbin described above, wherein the bottom surface of the second groove is flat.

With such a configuration, even when the bottom surface of the second groove is flat, it is possible to reduce the thickness of at least the second frame body in the second core region to suppress the occurrence of voids, and improve the quality. it can.

Further, the coil bobbin of the present invention, in the coil bobbin, the cylindrical member, one first iron core region of the one first frame body, and the second frame body fitted into the first frame body, respectively. The coil bobbin is arranged so as to enclose only one second core region adjacent to one first core region.

With such a configuration, a coil bobbin that encloses one first iron core region and one second iron core region adjacent thereto with a cylindrical member, for example, in a coil bobbin used for an outer iron type transformer, at least a second iron core region. It is possible to reduce the thickness of the second frame body to suppress the occurrence of voids and improve the quality.

Further, in the coil bobbin of the present invention, in the coil bobbin, the first frame body has two first core regions arranged so as to face each other, and is provided with two cylindrical members. Is a state in which the second frame body is fitted inside the first frame body, the first frame body and the second frame body, the first iron core region and the second iron core region arranged adjacent to each other. And a coil bobbin arranged so as to wrap each of the two sets.

With such a configuration, a coil bobbin that wraps two sets of two first iron core regions and a second iron core region adjacent to each other in a cylindrical member, for example, an outer iron type transformer provided with a pair of opposing winding iron cores. In the coil bobbin used in the container, at least the thickness of the second frame body in each second iron core region can be reduced to suppress the occurrence of voids and improve the quality.

In addition, the coil bobbin of the present invention includes, in the coil bobbin, two first frame bodies, and the two first frame bodies are arranged such that the first grooves of the respective first core regions face each other. And two second frame bodies that are fitted into the two first frame bodies, respectively, and the cylindrical member has the first core regions and the two first frame bodies that are arranged so as to face each other. It is a coil bobbin arranged so as to enclose the second iron core region that each of the two second frames adjacent to the first iron core region has.

With such a configuration, a coil bobbin that encloses the first iron core regions of the two first frame bodies and the second iron core regions of the second frame bodies adjacent to the first iron core regions with one cylindrical member, for example, an inner iron type transformer. In the coil bobbin used in the container, it is possible to reduce the thickness of the second frame body in at least two second iron core regions to suppress the occurrence of voids, and to improve the quality.

A transformer of the present invention is a transformer having the above-mentioned coil bobbin, coils wound around the first groove and the second groove of the coil bobbin, and a wound iron core wound around a cylindrical member.

With such a configuration, by reducing the thickness of at least the second iron core region to suppress the occurrence of voids in the second iron core region, it is possible to prevent quality deterioration from occurring due to discharge occurring in the voids, Can be increased. In addition, it is possible to reduce the cost by reducing the amount of resin.

According to the coil bobbin and the like according to the present invention, it is possible to suppress the occurrence of voids in the region inside the winding core of the coil bobbin around which the coil on the high voltage side is wound, improve the quality, and reduce the cost. You can

A perspective view (FIG. 1A), a plan view (FIG. 1B), a side view (FIG. 1C), and a front view (FIG. 1D) of a coil bobbin according to an embodiment of the present invention. A partially cutaway perspective view (FIG. 2(a)), a plan view (FIG. 2(b)), a side view (FIG. 2(c)), and a front view (FIG. 2(d)) of a transformer using the coil bobbin. )) An exploded perspective view of the coil bobbin wound with a coil (FIG. 3A) and a perspective view of the coil bobbin wound with the coil (FIG. 3B). A perspective view (FIG. 4(a)), a plan view (FIG. 4(b)), a side view (FIG. 4(c)), and a front view (FIG. 4(d)) of the first frame body forming the coil bobbin. ) A perspective view (FIG. 5(a)), a plan view (FIG. 5(b)), a side view (FIG. 5(c)), and a front view (FIG. 5(d)) of the second frame body that constitutes the coil bobbin. ) A sectional view taken along line VIa-VIa in FIG. 1 (FIG. 6A) and a sectional view taken along line VIb-VIb in FIG. 2 (FIG. 6B). The figure for demonstrating an example of the structure of the circuit which has the transformer which used the same coil bobbin. A front view (FIG. 8A) for explaining a modified example of the transformer using the coil bobbin, and a cross-sectional view taken along line VIIIb-VIIIb of FIG. 8 (FIG. 8B).

Hereinafter, embodiments such as a coil bobbin will be described with reference to the drawings. It should be noted that, in the embodiments, the components denoted by the same reference numerals perform the same operation, and thus the repeated description may be omitted.

(Embodiment)
1 is a perspective view (FIG. 1(a)), a plan view (FIG. 1(b)), a side view (FIG. 1(c)), and a front view (FIG. 1(d)) of a coil bobbin in the present embodiment. ).

FIG. 2 is a partially cutaway perspective view (FIG. 2A), a plan view (FIG. 2B), a side view (FIG. 2C), and a front view of the transformer according to the present embodiment. It is FIG.2(d). This transformer is a transformer manufactured using the coil bobbin of the present embodiment.

FIG. 3 is an exploded perspective view (FIG. 3A) of the coil bobbin with the coil wound according to the present embodiment, and a perspective view (FIG. 3B) of the coil bobbin with the coil wound.

FIG. 4 is a perspective view (FIG. 4(a)), a plan view (FIG. 4(b)), a side view (FIG. 4(c)), and a side view (FIG. 4(c)) of the first frame body forming the coil bobbin in the present embodiment. It is a front view (FIG.4(d)).

FIG. 5 is a perspective view (FIG. 5(a)), a plan view (FIG. 5(b)), a side view (FIG. 5(c)), and a side view (FIG. 5(c)) of the second frame body that constitutes the coil bobbin in the present embodiment. It is a front view (FIG.5(d)).

FIG. 6 is a sectional view taken along line VIa-VIa in FIG. 1C (FIG. 6A) and a sectional view taken along line VIb-VIb in FIG. 2C (FIG. 6B).

The coil bobbin 1 includes a first frame body 101, a second frame body 201, and a cylindrical member 301. In the present embodiment, the first coil 10 arranged in the first groove 1011 of the first frame body 101 and the second coil arranged in the second groove 2011 of the second frame body 201. The case where each of the coils 20 is composed of a plurality of windings will be described as an example. The winding is, for example, a wire 10a or a wire 20a wound a desired number of times.

As shown in FIG. 4 and the like, the first frame 101 is a frame-shaped member having a rectangular shape when viewed from the front. Here, a case will be described in which the outer circumference and the inner circumference of the first frame body 101 have a rectangular shape with rounded corners. However, the corners do not have to be rounded. Further, the radius of curvature of the corner here does not matter. The distance between the outer circumference and the inner circumference of the first frame body 101 does not matter. The first frame body 101 has a through hole 1017. The through hole 1017 is a hole into which the second frame body 201 is fitted, and is, for example, a hole surrounded by the inner peripheral surface of the first frame body 101. The front surface of the first frame body 101 is herein defined as one of the opening surfaces of the through holes 1017 of the first frame body 101. The same applies to the front surface of the second frame body 201 described later.

The first frame 101 is made of resin, for example. The first frame 101 is, for example, a resin molded product. The type of resin used for the first frame 101 does not matter. As the resin used for the first frame body 101, for example, a resin used as a material for a coil bobbin used for an ordinary transformer or the like can be used. The first frame body 101 is made of, for example, a thermoplastic resin.

The first frame 101 is provided with a first groove 1011 in which the first coil 10 is arranged along the outer circumference. The first groove 1011 is a concave groove. The first groove 1011 is, for example, a groove extending in the circumferential direction of the first frame body 101. The first groove 1011 may be considered as a groove extending along the outer surface provided on the outer surface of the first frame 101, for example. Here, the first groove 1011 is provided over the entire outer periphery of the first frame 101. Further, the bottom surface of the portion of the first groove 1011 corresponding to the corner of the first frame body 101 has a rounded corner here. However, the corners do not have to be rounded. It should be noted that plate-shaped members (not shown) are provided along the outer periphery of the first frame 101 on both sides of the outer periphery of the first frame 101, that is, on the front surface side and the back surface side. The combination of the plate-shaped member and the outer peripheral portion of the first frame 1 may be considered as the first groove 1011. The same applies to the second groove 2011 described later. Further, a notch or the like may be partially provided on the side surface or the bottom surface of the first groove 1011. The same applies to the second groove 2011.

Of the bottom surface of the first groove 1011, near the portion corresponding to the four corners when viewed from the front side of the first frame body 101, that is, near the curved portion of the first frame body 101, A plurality of guide grooves 1011c extending along the outer periphery of one frame 101 is provided. The bottom surface of the first groove 1011 is, for example, a portion around which the first coil 10 of the first groove 1011 is wound, and the first groove 1011 has a step shape in the width direction as described later. In such a case, the portion having the one or more step shapes around which the first coil 10 is wound may be considered as a part of the bottom surface.

The guide groove 1011c is a groove for guiding the winding position for winding the conductor wire 10a in alignment with the first groove 1011. The guide groove 1011c is a groove having an arcuate cross-sectional shape, and is provided in the width direction of the first groove 1011 at the same pitch as the diameter Φ _{1 of the} conducting wire 10a. The width of the guide groove 1011c is less than or equal to the diameter Φ ₁ of the conductor wire 10a, and the depth is less than or equal to half the diameter Φ ₁ of the conductor wire 10a.

The cross-sectional shape of the guide groove 1011c does not have to be a circular arc shape, and may be another shape. For example, the guide groove 1011c may be a V-shaped groove. Further, instead of providing the groove, by providing one or two or more protrusions (not shown) extending in a stripe shape along the extending direction of the first groove 1011, the portion between the protrusions is used as the guide groove 1011c. You may use. Further, the guide groove 1011c may be provided on the side surface of the second groove 1011. In addition, the guide groove 1011c may be provided in a portion other than the vicinity of the bent portion of the first frame body 101. Although a plurality of guide grooves 1011c are provided here, the number of guide grooves 1011c may be one or more. The guide groove 1011c may be omitted if a guide or the like for winding is not required.

The cross-sectional shape of the first frame body 101 has a shape that follows the shape of the first groove 1011. The cross-sectional shape of the first frame 101 is, for example, a cross section perpendicular to the direction along the outer circumference of the first frame 101. Hereinafter, the direction along the outer periphery of the first frame body 101 is referred to as the outer peripheral direction of the first frame body 101. The shape of the first groove 1011 here is, for example, the cross-sectional shape of the first groove 1011. This cross-sectional shape is, for example, a cross-sectional shape perpendicular to the extending direction of the first groove 1011. The shape of the first groove 1011 may be considered to be the cross-sectional shape of the inner surface of the first groove 1011. However, the cross section here is assumed to be a cross section excluding a reinforcing member such as the reinforcing rib 1013 and a member such as a protrusion necessary for molding. The cross-sectional shape having a shape along the shape of the first groove 1011 means, for example, the distance between the inner surface of the first groove 1011 and the outer surface of the first frame 101. May be uniform, that is, may be equidistant, or the thickness of at least a portion of the first frame body 101 along the inner surface of the first groove 1011 may be uniform. good. The thickness of the first frame body 101 is, for example, the thickness of the first frame body 101 in the direction perpendicular to the inner surface of the first groove 1011. Even if there is a difference in distance or thickness such as an error, for example, a difference in distance or thickness that is less than half of the conductive wire 10a wound around the first groove 1011 or the like, the distance and thickness are uniform here. You can think of it as By reducing the thickness of the portion of the first frame body 101 along the first groove 1011 by making the cross-sectional shape of the first frame body 101 along the shape of the first groove 1011. As a result, voids are less likely to occur in the first frame 101. The thickness of the portion of the first frame body 101 along the first groove 1011 is preferably a thickness that can prevent the occurrence of voids. For example, the thickness of the portion of the first frame body 101 along the first groove 1011 is preferably 4 mm or less, and more preferably 3 mm or less.

The first groove 1011 has a flat bottom surface and a side surface perpendicular to the bottom surface, as shown in FIG. In addition to having such a cross-sectional shape, the width of the first groove 1011 or the distance between the side surfaces is approximately (k+1/2) times or more and less than (k+1) times the diameter Φ ₁ of the first conducting wire 10a (however, , K is an integer of 1 or more), so that when the conductor wire 10a is wound around the first groove 1011 in the width direction of the first groove 1011 in an aligned manner, the winding of the conductor wire 10a of each layer is performed. The numbers can be the same. Thereby, when the conductive wire 10a is sequentially wound around the first groove 1011 to produce a plurality of windings each having a desired number of turns forming the first coil 10, for example, the number of turns of each winding is The terminal of each winding can be taken out from the side wall side in the width direction of the first groove 1011 by setting the number of turns that can be wound around the bottom surface of the first groove 1011 to be an integral multiple. In addition, for example, by setting the number of turns of each winding to be an even multiple of the number of turns that can be wound on the bottom surface of the first groove 1011, the terminal of each winding is provided on the side wall side of the first groove 1011 in the width direction. It is possible to take it out from. However, in the present invention, any cross-sectional shape may be used as the first groove 1011. For example, you may make it provide the 1st groove|channel 1011 which has a cross-sectional shape whose side surface inclines toward the outer side of the 1st groove|channel 1011.

When the conductive wire 10a is reciprocally wound around the first groove 1011, the number of windings of the conductive wire 10a wound in one reciprocation can be the same regardless of the width of the first groove 1011. .. Therefore, for example, by setting the number of turns of the conductive wire 10a of each winding forming the first coil 10 to be an integral multiple of the number of turns that can be wound around the bottom surface of the first groove 1011 in the width direction in one reciprocation, The wire terminal can be taken out from the side wall side of the first groove 1011 in the width direction.

Although the case where the first groove 1011 does not have a step shape has been described here, the first groove 1011 may have a step shape. The stepped shape here may be considered to be, for example, a portion in which the height difference is at least approximately √3 times or more the radius r of the conductive wire 10a wound around the first groove 1011. When the conducting wire 10a is wound in an aligned manner, in order to prevent the aligned winding from collapsing in the step portion, the height difference of the step shape is, for example, approximately the radius r×n×√3 of the conducting wire 10a. Is preferable (provided that n is an integer of 1 or more). The height difference here is, for example, a height difference based on the lowest position (for example, the bottommost surface side) of the conductive wire 10a arranged on the lower side of the step shape. The step shape of the first groove 1011 may be any step shape.

The first frame body 101 has a pair of first core areas 1012 that are parallel to each other. The first iron core region 1012 is a region of the first frame body 101 located inside the winding iron core 3 when the transformer 1000 is manufactured using the coil bobbin 1. The first iron core region 1012 has a linearly extending shape. However, the first iron core region 1012 may not necessarily have a linearly extending shape, and may have, for example, some curvature. Here, the height of the side wall of the first iron core region 1012 of the first groove 1011 is set so that the cylindrical member 301 can be arranged close to the first coil 10 arranged in the first groove 1011. Although the case where it is lower than the side wall of the region adjacent to the first core region 1012 of the frame 101 is shown, when the height of the side wall of the first groove 1011 is generally low, the first core region 1012 The part may not be recessed.

The first frame 101 has a plurality of reinforcing ribs 1013. The reinforcing rib 1013 is a plate-shaped member provided perpendicular to the outer peripheral direction of the first frame 101. However, as long as the strength and the like of the first frame 101 can be maintained, the number of reinforcing ribs 1013, the planar shape, the thickness, the size, the installation position, and the like do not matter. Further, here, the case where the reinforcing rib 1013 which is a plate-shaped member is provided as the reinforcing member has been described, but in the present invention, a reinforcing member other than the plate-shaped reinforcing rib 1013 is used for reinforcing. A member may be provided. For example, reinforcing ribs having a shape other than the plate shape may be provided, or another reinforcing member (not shown) may be provided. The reinforcing rib 1013 can be omitted when reinforcement is not necessary due to the material of the first frame 101, the overall size, and the like. The reinforcing rib 1013 is preferably not provided on the inner peripheral side of the first frame body 101.

Here, five reinforcing ribs 1013 are provided on the front side of each first iron core region 1012, and a part of them (here, the reinforcing ribs 1013 at both ends and the reinforcing rib 1013 in the middle) are provided. A protrusion 1014 for positioning and fixing the cylindrical member 301 in the first iron core region 1012 is provided on the front surface side of the one frame body 101 in the vicinity of the through hole 1017. Similarly, five reinforcing ribs 1013 are provided on the back side of each first iron core region 1012, and a part of them (here, the reinforcing ribs 1013 at both ends and the reinforcing rib 1013 in the middle) are provided. A protrusion 1014 for positioning and fixing the cylindrical member 301 in the first iron core region 1012 is provided on the rear surface side of the one frame body 101 in the vicinity of the through hole 1017. The back side is the side opposite to the front side. The projections 1014 on the front surface side and the back surface side of the first frame body 101 are, for example, with respect to the opening surface of the through hole 1017 of the first frame body 101 or with respect to the front surface of the first frame body 101. It is a protrusion protruding in the vertical direction. Note that the number of reinforcing ribs 1013 arranged in the first iron core region 1012, the number of reinforcing ribs 1013 having the protrusions 1014, and the like do not matter. Further, it does not matter how the protrusion 1014 is provided. Further, the protrusion 1014 may not be provided on the reinforcing rib 1013, and may be provided, for example, on a base (not shown) to which the protrusion 1014 is attached, or directly attached to the first frame 101. May be. Further, instead of being provided on the reinforcing rib 1013, the protrusion 1014 may be provided on the front side of the reinforcing rib 2013 and the like of the second iron core region 2012 of the second frame 201 in the same manner as above.

The two sides of the first groove 1011 on one side connecting the sides where the pair of first core regions 1012 of the first frame 101 having a rectangular shape are provided are notched in a rectangular shape. The terminal lead-out portion 1015 is provided. The terminal lead-out portion 1015 is a portion for taking out the terminal of the first coil 10. The shape of the terminal lead-out portion 1015 may be other than the above. For example, the terminal lead-out portion 1015 may be one or more through holes provided in one or more side walls of the first groove 1011. For example, the terminal lead-out portion 1015 may be provided on one side wall of the first groove 1011. Further, the terminal lead-out portion 1015 may be configured by a plurality of cutout portions provided on at least one side portion of the first groove 1011. Further, the terminal lead-out portion 1015 may be provided on each of two sides that connect the sides of the first frame body 101 on which the pair of first iron core regions 1012 are provided. The first frame 101 may not have the terminal lead-out portion 1015.

The second frame body 201 is a frame-shaped member that is fitted inside the first frame body 101. The inner side of the first frame 101 is the inside of the through hole 1017 of the first frame 101. The second frame body 201 is fitted in the through hole 1017 of the first frame body 101, for example. The second frame body 201 has a through hole 2014. The second frame body 201 has, for example, a shape that fits inside the first frame body 101. The fact that the second frame body 201 is fitted inside the first frame body 101 means, for example, the opening surface of the through hole 1017 of the first frame body 101 and the through hole 2014 of the second frame body 201. It may be considered that the second frame body 201 is arranged inside the first frame body 101 so as to be parallel to the opening surface of the second frame body 201, which will be described later provided on the outer periphery of the second frame body 201. It may be considered that the second frame body 201 is arranged with respect to the first frame body 101 so that the entire second groove 2011 faces the inner peripheral surface of the first frame body 101. Inside the first frame body 101, for example, a locking portion 1016 for locking the second frame body 201 fitted from the front side of the first frame body 101 in the fitted state is provided. There is. The front surface is, for example, one of the surfaces having the opening surface of the first frame body 101. The locking portion 1016 is a protrusion provided on the back side inside the first frame 101. However, the locking portion 1016 may have a structure other than the above as long as it can lock the second frame 201 in the through hole 1017 of the first frame 101. .. Here, the second frame body 201 is a frame-shaped member having a rectangular shape when viewed from the front. Here, a case where the outer circumference and the inner circumference of the second frame 201 have a rectangular shape with rounded corners will be described. However, the shape of the second frame 201 may be any shape as long as it fits into the first frame 101, and the corners may not be rounded. Further, the radius of curvature of the corner here does not matter. The distance between the outer circumference and the inner circumference of the second frame body 201 does not matter.

The second frame body 201 is made of, for example, a resin similarly to the first frame body 101. The resin of the second frame body 201 and the resin of the first frame body 101 may be different resins or the same resin.

The second frame 201 is provided with a second groove 2011 in which the second coil 20 is arranged along the outer circumference. The second groove 2011 is a concave groove. The second groove 2011 is, for example, a groove extending in the circumferential direction of the second frame body 201. The second groove 2011 may be considered as a groove extending along the outer surface provided on the outer surface of the second frame 201, for example. Here, the second groove 2011 is provided over the entire outer periphery of the second frame 201. The bottom surface of the portion of the second groove 2011 corresponding to the corner of the second frame body 201 has a rounded corner here. However, the corners do not have to be rounded.

Of the bottom surface of the second groove 2011, in the vicinity of the portion corresponding to the four corners when viewed from the front side of the second frame body 201, that is, in the vicinity of the bent portion of the second frame body 201, , A plurality of guide grooves 2011c extending along the outer periphery of the second frame body 201 are provided. The bottom surface of the second groove 2011 is, for example, a portion around which the second coil 20 of the second groove 2011 is wound, and the second groove 2011 has a step shape in the width direction as described later. In such a case, the portion having the one or more step shapes around which the second coil 20 is wound may be considered as a part of the bottom surface.

The guide groove 2011c is a groove that guides the winding position for winding the conducting wire 20a in alignment with the second groove 2011. The guide groove 2011c is a groove having an arcuate cross-sectional shape, and is provided in the width direction of the second groove 2011 at the same pitch as the diameter Φ _{2 of the} conducting wire 20a. The width of the guide groove 2011c is less than or equal to the diameter Φ ₂ of the conductor wire 20a, and the depth is less than or equal to half the diameter Φ ₂ of the conductor wire 20a.

The cross-sectional shape of the guide groove 2011c does not have to be an arc shape, and may be another shape. For example, the guide groove 2011c may be a V-shaped groove. Further, instead of providing the groove, by providing one or more protrusions (not shown) extending in a stripe shape along the extending direction of the second groove 2011, the portion between the protrusions is used as the guide groove 2011c. You may use. Further, the guide groove 2011c may be provided on the side surface of the second groove 2011. Further, the guide groove 2011c may be provided in a portion other than the vicinity of the bent portion of the second frame body 201. Although a plurality of guide grooves 2011c are provided here, the number of guide grooves 2011c may be one or more. In addition, the guide groove 2011c may be omitted if a guide or the like at the time of winding is unnecessary.

The cross-sectional shape of the second frame body 201 has a shape that follows the shape of the second groove 2011. The cross-sectional shape of the second frame body 201 is, for example, a cross-sectional shape perpendicular to the direction along the outer circumference of the second frame body 201. The direction along the outer periphery of the second frame body 201 is hereinafter referred to as the outer peripheral direction of the second frame body 201. The shape of the second groove 2011 here is, for example, the cross-sectional shape of the second groove 2011. This cross-sectional shape is, for example, a cross-sectional shape perpendicular to the extending direction of the second groove 2011. The shape of the second groove 2011 may be considered to be the cross-sectional shape of the inner surface of the second groove 2011. However, the cross section here is assumed to be a cross section excluding a reinforcing member such as a reinforcing rib 2013 described later and a member such as a protrusion necessary for molding. Further, the cross-sectional shape here excludes a cross-section of a member or the like provided on the inner surface of the second groove 2011 such as the dividing wall 2017. The cross-sectional shape having a shape along the shape of the second groove 2011 means, for example, the distance between the inner surface of the second groove 2011 and the outer surface of the second frame 201. May be uniform, that is, they may be equidistant, or the thickness of at least a portion of the second frame 201 along the inner surface of the second groove 2011 may be uniform. good. The thickness of the second frame body 201 is, for example, the thickness of the second frame body 201 in the direction perpendicular to the inner surface of the second groove 2011. By setting the cross-sectional shape of the second frame body 201 to be a shape that follows the shape of the second groove 2011, the thickness of the second frame body 201 can be reduced, and as a result, the second frame body can be formed. Voids can be made less likely to occur in the body 201. The thickness of the second frame body 201 is preferably a thickness that can prevent the generation of voids. For example, the thickness of the portion of the second frame body 201 along the second groove 2011 is preferably 4 mm or less, and more preferably 3 mm or less.

Note that, in the cross-sectional shape of the second frame body 201, for example, even when there is a slight difference in distance or thickness such as an error, it may be considered that the distance or thickness is uniform. The same applies to the first groove 1011. The difference in the distance and the thickness that are in the degree of error is, for example, the difference in the distance and the thickness that are half or less of the conductive wire 20a wound around the second groove 2011. For example, when considering whether or not the cross-sectional shape of the second frame body 201 is along the shape of the second groove 2011, the shape of the inner surface of the second groove 2011 is as described above. Irregularities such as the guide groove 2011c and minute irregularities on the outer peripheral surface with respect to the second groove 2011 may or may not be designed, and the inner surface of the second groove 2011 may be included. When considering whether or not the cross-sectional shape of the second frame body 201 is along the shape of the second groove 2011, such minute unevenness may be excluded. You may not consider it. That is, it is sufficient that the cross-sectional shape of the second frame body 201 is substantially a shape along the shape of the second groove 2011 when the unevenness is ignored. Ignoring the unevenness may be considered, for example, to consider a smooth surface without such unevenness as the inner surface of the second groove 2011. The same applies to the first groove 1011. However, it goes without saying that it is preferable not to have such unevenness. For example, it is preferable that such irregularities do not exist particularly in the second iron core region 1012. For example, it is preferable not to provide the guide groove 2011c as described above in the second iron core region 2012. The same applies to the first iron core region 1012.

As shown in FIG. 4B, the second groove 2011 has a step shape in the width direction of the second groove 2011. In the present embodiment, the second groove 2011 is provided in the center of the outer groove 2011a having a flat bottom surface and the lower sides of both side surfaces being inclined outward, and in the center of the bottom surface of the outer groove 2011a. The inner groove 2011b has a flat bottom surface, both side surfaces are vertical, and the width is narrower than the bottom surface of the outer groove 2011a. As a result, a step shape is formed between the bottom surface of the outer groove 2011a of the second groove 2011 and the side surface of the inner groove 2011b. Here, a portion having this step shape is referred to as a step portion 2018. Note that, here, since the upper sides of both side surfaces of the outer groove 2011a are perpendicular to the bottom surface of the outer groove 2011a, this vertical surface and the outer side of the lower side of both side surfaces of the outer groove 2011a are inclined. The portion between the surface and the bottom surface of the outer groove 2011a may also be considered as a step portion having a step shape. The angle of the inclined surfaces of both side surfaces of the outer groove 2011a with respect to the bottom surface is preferably in the range of 100 to 140 degrees, for example.

Note that the step shape here may be considered to be, for example, a portion where the height difference is at least √3 times the radius r of the conductive wire 20a wound around the second groove 2011 or more. In order to prevent the aligned winding from collapsing in the step portion 2018 when the conductive wire 20a is wound in an aligned manner, the height difference of the step shape is, for example, approximately the radius r×n×√3 of the conductive wire 10a. Is preferable (provided that n is an integer of 1 or more). The height difference here is, for example, a height difference based on the lowest position (for example, the bottommost surface side) of the conducting wire 20a arranged on the lower side of the step shape. The step shape of the second groove 2011 may be a step shape other than the above. The step shape of the second groove 2011 may be, for example, one step or two or more steps in which the width of the second groove 2011 gradually decreases toward the bottom surface of the second groove 2011. .. Further, when the second groove 2011 has a step shape, the bottom surface of the second groove 2011 is preferably a flat surface. The second groove 2011 does not have to have a step shape. The first groove 1011 may or may not have a step shape.

Further, in the center of the bottom surface of the second groove 2011, here, in the center of the bottom surface of the inner groove 2011b, a partition wall 2017 extending along the second groove 2011 and perpendicular to the bottom surface is provided. However, the dividing wall 2017 may be provided at a position other than the center of the bottom surface. By providing the partition wall 2017 as described above, when the conductive wires 20a are aligned on the bottom surface of the second groove 2011 and sequentially wound in layers, the width of each overlapping layer is set to be smaller than that in the case where the partition wall 2017 does not exist. Therefore, it is not necessary to maintain a high withstand voltage between the layers where the windings overlap each other, it is possible to reduce insulation measures and the like, and it is possible to reduce parts and costs.

In addition, in the second groove 2011, the side surface of the inner groove 2011b and the partition wall 2017 are made perpendicular to the bottom surface, and the distance (that is, the width) between the side surface of the inner groove 2011b and the partition wall 2017 is set. ) Is approximately (m+1/2) times or more and less than (m+1) times the diameter Φ ₂ of the second conductor 20a (provided that m is an integer of 1 or more), the conductor 20a is When the inner groove 2011b is aligned and wound in the width direction of the second groove 2011, the number of windings of the conductor wire 20a in each layer can be the same. Thus, for example, when the conductive wire 20a is wound around the inner groove 2011b in order and a plurality of windings each having a desired number of turns forming the second coil 20 are manufactured, the number of windings of the conductive wire 20a of each winding is determined. The number of turns that can be wound around the bottom surface of the inner groove 2011b divided by the dividing wall 2017 is an integral multiple of the number of turns, so that the terminal of each winding is a side wall of the region in which the conductor wire 20a of the second groove 2011 is wound. Side or the division wall 2017 side can be taken out. The number of turns of each winding is set to be an even multiple of the number of turns that can be wound on the bottom surface of the inner groove 2011b divided by the dividing wall 2017, so that the terminal of each winding is wound by the conductor wire 20a of the second groove 2011. It is possible to take out from the side wall side of the attached region. This is the same when the conducting wire 20a is wound between both side surfaces of the inner groove 2011b when there is no partition wall 2017. Further, since the side surface of the outer groove 2011a of the second groove 2011 is inclined with respect to the bottom surface of the outer groove 2011a, the number of turns can be increased as compared with the case where the side surface is perpendicular to the bottom surface.

When the conductive wire 20a is reciprocally wound between the side wall perpendicular to the bottom surface of the inner groove 2011b and the partition wall 2017, the distance between the side surface of the inner groove 2011b and the partition wall 2017 is related. Instead, the number of windings of the conductive wire 20a wound in one reciprocation can be the same. Therefore, for example, when the conductive wire 20a is wound around the inner groove 2011b in order and a plurality of windings each having a desired number of windings forming the second coil 20 are manufactured, the number of windings of the conductive wire 20a of each winding is determined. The number of windings that can be wound in one reciprocation in the width direction on the bottom surface of the inner groove 2011b divided by the partition wall 2017 is an integral multiple of the number of windings, so that the terminal of each winding is wound by the conductor wire 20a of the second groove 2011. It can be taken out from the side wall side or the division wall 2017 side of the area. This is the same when the conducting wire 20a is wound between both side surfaces of the inner groove 2011b when there is no partition wall 2017.

Since the winding start of the conducting wire 20a is normally from the side wall side of the second groove 2011, the terminals of each winding wound by winding at an integral multiple of reciprocation are also taken out from the side wall side. In particular, when the inner groove 2011b is used as a region for winding a winding used as a tap winding as in the example given in the present embodiment, normally, the conductor wire 20a is provided from the side wall side of the second groove 2011. The terminal of each winding wound around is also taken out from the side wall side, and is not taken out from the divided wall 2017 side.

In the present invention, any shape may be used as the second groove 2011. Further, the second groove 2011 does not have to have the dividing wall 2017.

The second frame body 201 has a second iron core region 2012. The second core region 2012 is a region of the second frame body 201 located inside the winding core 3 when the transformer 1000 is manufactured using the coil bobbin 1. A second iron core region 2012 is provided at a position adjacent to each of the one or more first iron core regions 1012 included in the first frame body 101. The position adjacent to the first iron core region 1012 is, for example, a position adjacent to each first iron core region 1012 included in the first frame body 101 with the second frame body 201 fitted in the first frame body 101. Is. Here, the second frame body 201 has the second iron core regions 2012 at positions adjacent to the pair of first iron core regions 1012 that the first frame body 101 has and are parallel to each other. Therefore, the second frame body 201 has a pair of second core regions 2012 that are parallel to each other. The second iron core region 2012 has a shape that extends linearly. However, the second iron core region 2012 does not necessarily have a linearly extending shape, and may have, for example, some curvature.

The second frame body 201 has a plurality of reinforcing ribs 2013. The reinforcing rib 2013 is, for example, a plate-shaped member provided perpendicular to the outer peripheral direction of the second frame body 201. However, as long as the strength and the like of the second frame 201 can be maintained, the number of reinforcing ribs 2013, the planar shape, the thickness, the size, the installation position, and the like do not matter. Further, here, the case where the reinforcing rib 2013 which is a plate-shaped member is provided as the reinforcing member has been described, but in the present invention, a reinforcing member other than the plate-shaped reinforcing rib 2013 is used for reinforcing. A member may be provided. For example, reinforcing ribs having a shape other than the plate shape may be provided, or another reinforcing member (not shown) may be provided. The reinforcing rib 2013 can be omitted when reinforcement is not necessary depending on the material of the second frame body 201, the overall size, and the like. The reinforcing rib 2013 is preferably not provided on the outer peripheral side of the second frame 201. Note that the shape of the reinforcing member such as the reinforcing rib 2013 provided in the second iron core region 2012 is such that the second frame body 201 is formed in the first frame 201 so that the insulating oil or the like can flow into and out of the cooling hole 2019. The inner surface of the cylindrical member 301 and the second frame member 201 are fitted to the inside of the frame member 101, and in the state where a cylindrical member 301, which will be described later, is arranged so as to enclose the adjacent first iron core region 1012 and second iron core region 2012. It is preferable to have a shape that does not prevent the state in which the gap generated between the second core region 2011 and the opening at the end of the cylindrical member 301 communicate with each other. For example, it is preferable that the reinforcing rib 2013 provided in the second iron core region 2012 has a planar shape in which a gap or the like is formed at least partially with the inner surface of the cylindrical member 301 described later. Here, the planar shape of the portion of the reinforcing rib 2013 located inside the cylindrical member 301 is a polygonal shape. The same applies to the reinforcing rib 1013 provided in the first iron core region 1012.

A rectangular groove is formed on each of the two sides connecting the sides of the second frame body 201 having a rectangular shape, where the pair of second core regions 2012 are provided, on both sides of the second groove 2011. Four terminal lead-out portions 2015a to 2015d that are notched in a shape are provided. Note that, hereinafter, for convenience of description, when the four terminal lead-out portions 2015a to 2015d are not distinguished, they may be simply referred to as terminal lead-out portions 2015. The terminal lead-out portion 2015 is a portion for taking out the terminal of the second coil 20. The terminals respectively taken out from the plurality of terminal lead-out portions 2015 may be, for example, terminals of a plurality of windings forming the second coil 20, and terminals of two or more windings of the plurality of windings may be replaced. It may be a connected terminal. The terminals taken out from the plurality of terminal take-out portions 2015 may be terminals used for so-called tap switching, for example. The number and shape of the terminal lead-out portions 2015 may be other than the above. For example, the terminal lead-out portion 1015 may be one or more through holes provided on one or more side portions of the second groove 2011. In addition, for example, the second frame body 201 may have only one terminal extraction portion 2015, or may have two or more. Further, at least a part of the plurality of terminal lead-out portions 2015 may have a shape different from the other shapes. Further, the plurality of terminal lead-out portions 1015 may be provided on one side of the second groove 2011. Further, the terminal lead-out portion 2015 may be provided only on one side that connects the sides of the second frame body 201 on which the pair of second iron core regions 2012 are provided. The second frame body 201 may not have the terminal lead-out portion 2015. In addition, here, the upper side of the side surface of the second groove 2011 between the terminal lead-out portion 2015a and the terminal lead-out portion 2015b and the upper side of the portion between the terminal lead-out portion 2015c and the terminal lead-out portion 2015d are cut out. However, the notch is not necessary.

The cylindrical member 301 is a cylindrical member. The cylindrical member 301 is open at both ends in the longitudinal direction. As shown in FIG. 1( a ), the cylindrical member 301 has the second frame body 201 fitted inside the first frame body 101, and the first frame body 101 and the second frame body 201. Of the first core region 1012 and the second core region 2012 that are adjacent to each other. Here, two cylindrical members 301 are arranged so as to respectively enclose a pair of a pair of first core areas 1012 and second core areas 2012 that are adjacent to each other. Here, as an example, one or more cylindrical members 301 in one coil bobbin 1 are fitted into one first iron core region 1012 of one first frame body 101 and this first frame body 101, respectively. A case will be described in which the second frame body 201 is arranged so as to wrap only one second iron core region 2012 adjacent to the one first iron core region 1012. However, it is preferable that both ends in the longitudinal direction of the cylindrical member 301 are completely opened, but if insulating oil can flow into and out of the inside of the cylindrical member 301, both ends of the cylindrical member 301 are partially It may be open. Further, the cylindrical member 301 may have one or more openings (not shown) that allow inflow and outflow of insulating oil near both ends, instead of having both ends open.

The cylindrical member 301 is a member around which the wound iron core 3 is wound. For the cylindrical member 301, for example, by winding a steel plate, which is a material of the wound iron core 3 such as an electromagnetic steel plate, it is possible to produce a regular cylindrical wound iron core with little distortion, distortion, winding disorder, or the like. The outer surface, that is, the outer peripheral surface, may have one or more flat portions, and the outer peripheral surface may have one or more recesses or protrusions as long as they are one or more. It may have a hole, a slit, a notch, or the like, and at least a part thereof may have a mesh shape. Further, the cylindrical member 301 has a shape close to a cylinder, and as long as it is possible to manufacture a regular cylindrical wound iron core without distortion by winding a steel plate, The side may have a polygonal columnar shape.

The material of the cylindrical member 301 is resin, for example. The resin of the cylindrical member 301 and the resin of the first frame 101 may be different resins or the same resin. The same applies to the resin of the cylindrical member 301 and the resin of the second frame body 201. The thickness of the cylindrical member 301 does not matter. However, it is preferable that the cylindrical member 301 also has a thickness that does not generate voids, for example, a thickness of 4 mm or less. The diameter and the arrangement of the cylindrical member 301 are, for example, a pair of the first iron core regions 1012 in the state where the second frame 201 is arranged inside the first frame 101, that is, on the inner peripheral side. And a diameter such that the distance between the first iron core region 1012 and the second iron core region 2012, which are arranged inside the cylindrical member 301, that is, on the inner peripheral side, is as short as possible while being arranged so as to enclose the second iron core region 2012. The arrangement is preferable. For example, the diameter and arrangement may be such that the inner surface of the cylindrical member 301, that is, the inner peripheral surface, contacts at least a part of the first iron core region 1012 and the second iron core region 2012 arranged on the inner peripheral side of the cylindrical member 301. Good. The length of the cylindrical member 301 in the longitudinal direction does not matter. The length of the cylindrical member 301 in the longitudinal direction is set according to, for example, the width of the wound core 3.

The cylindrical member 301 is composed of a pair of semi-cylindrical portions 3011a and 3011b. The semi-cylindrical portion 3011a is arranged on the front side of the first frame body 101, and the semi-cylindrical portion 3011b is arranged on the rear side of the first frame body 101. A pair of semi-cylindrical portion 3011a and semi-cylindrical portion 3011b are arranged such that the arcuate convex directions are opposite to each other in the same straight line, and the two end portions 3013 extending along the longitudinal direction of each are formed. The semi-cylindrical portion 3011a and the semi-cylindrical portion 3011b are assembled to form the cylindrical member 301 by joining the facing members. The end portion 2013 may be considered as a joint surface. The semi-cylindrical parts 3011a and 3011b are members having a shape obtained by dividing the cylindrical member 301 into two parts so as to be symmetrical in the longitudinal direction, and combining the two semi-cylindrical parts 3011a and 3011b. Then, the cylindrical member 301 is configured. However, the semi-cylindrical portions 3011a and 3011b do not necessarily have to have symmetrical shapes. For example, the semi-cylindrical parts 3011a and 3011b may be members having an asymmetrical shape obtained by dividing the cylindrical member 301 into two in the longitudinal direction at a position intersecting a plane parallel to the central axis thereof.

The pair of semi-cylindrical parts 3011a and 3011b have a connecting means 3012. The pair of semi-cylindrical parts 3011a and 3011b are connected by the connecting means 3012. The connecting means 3012 assembles the semi-cylindrical portion 3011a and the semi-cylindrical portion 3011b in the vicinity of the two end portions 3013 that extend along the longitudinal direction of the semi-cylindrical portion 3011a and the semi-cylindrical portion 3011b, respectively. It is provided at a position facing each other. The connecting means 3012 is fitted to the protruding portion 3012a provided on either one of the semi-cylindrical portion 3011a and the semi-cylindrical portion 3011b and the protruding portion 3012a provided at a position facing the other protruding portion 3012a. It is configured as a set with the concave portion 3012b. Here, a pair of semi-cylindrical portions 3011a and 3011b is shown to include four pairs of connecting means 3012 at each of two opposing end portions 3013 extending in the longitudinal direction. The number of 3012 does not matter. Further, the connecting means included in the pair of semi-cylindrical portions 3011a and 3011b may be a connecting means other than the connecting means 3012 described above. Further, the connecting means can be omitted when the connection by the connecting means is not necessary, as in the case where the pair of semi-cylindrical portions 3011a and 3011b are bonded. Further, of the two end portions 3013 extending along the longitudinal direction of the pair of semi-cylindrical portions 3011a and 3011b, respectively, one of the end portions 3013 facing each other when the semi-cylindrical portions 3011a and 3011b are assembled is hinged ( (Not shown) or the like may be connected in advance so as to be rotatable, and the connecting means 3012 may be provided at the other opposing end portion 3013.

In addition, here, the case where the cylindrical member 301 is composed of the pair of semi-cylindrical portions 3011a and 3011b has been described, but the cylindrical member 301 may be constructed by assembling three or more members. good. Further, the cylindrical member 301 may have a configuration other than the above as long as it can be arranged so as to wrap the pair of the first iron core region 1012 and the second iron core region 2012, and has a structure other than the above. May be. For example, the cylindrical member 301 may be composed of one member.

The cylindrical member 301 has a recess 3014 that fits into the protrusion 1014 used for the positioning and fixing described above. Specifically, the cylindrical member 301 is positioned at a desired position so as to wrap the pair of the first iron core region 1012 and the second iron core region 2012, and is positioned on the first frame 101 of the cylindrical member 301 for positioning. Positioning protrusions 1014 are provided at positions corresponding to the respective protrusions 1014. Here, of the pair of semi-cylindrical portions 3011a and 3011b forming the cylindrical member 301, the first iron core region 1012 is located at the center in the width direction of the semi-cylindrical portion 3011a arranged on the front side of the first frame 101. Is provided with three recesses 3014 respectively fitted to the three protrusions 1014 arranged on the front side of the semi-cylindrical portion 3011b arranged on the back side of the first frame body 101, in the width direction. Three recesses 3014 that fit into the three protrusions 1014 arranged on the back side of the first iron core region 1012 are provided. However, the position and the number of the concave portions 3014 are not limited as long as they are the positions and the numbers corresponding to the protrusions 1014. Further, when the projection 1014 is not provided or when the positioning using the projection 1014 and the recess 3014 is unnecessary, the recess 3014 may be omitted. The coil bobbin 1 may have a positioning means or a configuration other than the positioning using the protrusion 1014 and the recess 3014 described above.

Next, the transformer 1000 having the coil bobbin 1 will be described. The transformer 1000 has a coil bobbin 1, a first coil 10, a second coil 20, and two winding cores 3.

As shown in FIG. 3A, the first coil 10 is arranged in the first groove 1011 of the first frame body 101 of the coil bobbin 1. The first coil 10 is a coil wound around the first groove 1011 and is composed of a conductive wire 10a. Usually, the first coil 10 is used as a so-called secondary coil of the transformer 1000. For example, the first coil 10 is used as a coil on the low voltage side with respect to the second coil 20 described later. The first coil 10 has a plurality of windings formed by winding a conductive wire 10a. The material of the conductive wire 10a may be any conductive wire that can be used in a normal transformer, and the material is not limited.

As shown in FIG. 6( b ), the first coil 10 is composed of a conducting wire 10 a wound in a line in a first groove 1011. Here, as an example, the first coil 10 is assumed to be composed of a first winding (not shown) and a second winding (not shown). In addition, in FIG. 6B, a cross section indicated by a white circle is a cross section of the conductive wire 10 a forming the first winding of the first coil 10, and a cross section indicated by hatching is a cross section of the first coil 10. It is a cross section of the conducting wire 10a which comprises a 2nd winding. It is assumed that the first winding and the second winding have the same number of turns. It should be noted that the winding method of the conducting wire 10a forming the first winding and the conducting wire 10a forming the second winding shown here is an example, and it goes without saying that other winding methods may be used. The second terminal (not shown) of the first winding is connected to the first terminal (not shown) of the second winding, and the connected terminal is the first frame 101. Of the terminal lead-out portion 1015 of FIG. The connected terminal is used, for example, as a ground for a single-phase three-wire output. The first terminal of the first winding and the second terminal of the second winding are individually taken out from one of the terminal lead-out portions 1015 to the outside. For example, one of them is a single-phase three-wire. It is used as the positive terminal of the output of the equation, and the other is used as the negative terminal. Note that, in FIG. 2 and FIG. 3 and the like, illustrations of terminals of windings taken out from the terminal lead-out portion 1015 are omitted.

Further, as shown in FIG. 3A, the second coil 20 is arranged in the second groove 2011 of the second frame body 201. The second coil 20 is a coil wound around the second groove 2011 and is composed of a conductor wire 20a. Generally, the second coil 20 is used as a so-called primary coil of the transformer 1000. Usually, the second coil 20 is used as a coil on the high voltage side with respect to the first coil 10. For example, the second coil 20 is used as a high voltage side coil that is connected to an electric power system or the like. Here, the second coil 20 has a plurality of windings configured by winding the conductor wire 20a. The material of the conductive wire 20a may be any conductive wire that can be used in a normal transformer, and the material is not limited.

As shown in FIG. 6B, the second coil 20 is composed of a conductive wire 20a wound in a line around the second groove 2011. Here, as an example, the second coil 20 includes a third winding (not shown), a fourth winding (not shown), a fifth winding (not shown), and a third winding (not shown). It is assumed to be composed of six windings (not shown) and a seventh winding (not shown). The third winding is a lower two-layer winding on the right side portion divided by the dividing wall 2017 of the second groove 2011, and the fourth winding is a two-layer winding on the third winding. A wire, the fifth winding is a two-layer winding on the fourth winding, and the sixth winding is a multiple-layer winding arranged on the fifth winding. .. The seventh winding is a multi-layer winding arranged on the left side portion of the second groove 2011 which is partitioned by the dividing wall 2017. From the third winding to the fifth winding, the side surface of the second groove 2011 is wound around the bottom surface of the inner groove 2011b that is perpendicular to the bottom surface in one reciprocating motion. For example, in any of the windings from the third winding to the fifth winding, the conductor 20a is wound from the right to the left in the lower row, and the upper layer is the portion of the dividing wall 2017. The conducting wire 20a wound around the lower layer is folded and wound from left to right. As a result, the first terminal and the second terminal, which are not shown, respectively included in the windings from the third winding to the fifth winding are all four terminals provided on the right side of the second groove 2011. It can be taken out from any one of the terminal takeout portions 2015. Note that, here, the case where the number of windings wound around the inner groove 2011b of the second groove 2011 having the side surface perpendicular to the bottom surface is three is described. Is not limited to three and may be one or two or more. Further, the number of reciprocations of each winding may be two or more. Further, the number of reciprocations of each winding may be the same or different. The height of the side surface of the inner groove 2011b is set, for example, to a height at which one or more windings to be arranged are at least accommodated.

Assuming that the right side in FIG. 6B is the front side of the second frame body 201, here, as an example, the first terminal (not shown) of the third winding is connected to the terminal extraction portion 2015a. The second terminal (not shown) of the third winding wire is connected to the first terminal (not shown) of the fourth winding wire, and is taken out from the terminal lead-out portion 2015b. The second terminal (not shown) of the fifth winding is connected to the first terminal (not shown) of the fifth winding, is taken out from the terminal lead-out portion 2015c, and is connected to the first terminal of the fifth winding. The second terminal (not shown) is connected to the first terminal (not shown) of the sixth winding and taken out from the terminal lead-out portion 2015d. The second terminal (not shown) of the sixth winding and the first terminal (not shown) of the seventh winding are connected outside the coil bobbin 1. Further, the second terminal (not shown) of the seventh winding is taken out from one of the second rear side terminal take-out portions 2015. Although the case where the terminal lead-out portions 2015a to 2015d are arranged counterclockwise when viewed from the front is shown here, the arrangement order of the four terminal lead-out portions 2015 does not matter in the present invention. .. Note that, in FIG. 2 and FIG. 3 and the like, illustrations of terminals of windings taken out from the terminal lead-out portion 1015 are omitted.

In a normal transformer, the primary coil has a higher voltage than the secondary coil, and a larger current flows in the secondary coil. Therefore, the primary coil used as the secondary coil is As the conductive wire 10 a forming the coil 10, a conductive wire thicker than the conductive wire forming the second coil 20 is used. The winding method of the first coil 10 and the second coil 20 may be a winding method other than the above-described aligned winding, and the winding method is not limited. The winding method of the first coil 10 and the second coil 20 shown in FIG. 2 and the like, the number of windings, the thickness of the conductive wires 10a and 20a, etc. are for the purpose of explanation, and the actual winding core 3 May differ from.

The second frame 201 in which the second coil 20 is wound in the second groove 2011 has a through hole 1017 in the first frame 101 in which the first coil 10 is wound in the first groove 1011. Be fitted into.

The two cylindrical members 301 are two sets of a first core region 1012 and a second core region 2012 that are adjacent to each other in a state where the second frame 201 is fitted in the through hole 1017 of the first frame 101. Are individually wrapped. The cylindrical member 301 is obtained by fitting a plurality of recesses 3014 provided at positions corresponding to the respective protrusions 1014 of the cylindrical member 301 into a plurality of protrusions 1014 provided on the front side and the back side of the first frame 101. It is positioned and placed in. Each cylindrical member 301 is configured by connecting the semi-cylindrical portions 3011a and 3011b with a plurality of connecting means 3012. Here, each cylindrical member 301 is configured by connecting the semi-cylindrical portions 3011a and 3011b by fitting the protrusions 3012a and the recesses 3012b, which respectively form the plurality of connecting means 3012, into each other.

As shown in FIG. 2, the wound iron core 3 is wound around each of the cylindrical members 301 arranged so as to respectively enclose two sets of the adjacent first iron core region 1012 and second iron core region 2012. The wound core 3 is an iron core formed by winding a steel plate (not shown) such as an electromagnetic steel plate around the cylindrical member 301. As the steel plate forming the winding core 3, it does not matter what kind of steel plate is used as long as it is a steel plate used for a normal winding core. The number of times the winding iron core 3 is wound does not matter. Further, the thickness and width of the steel plate used for the wound core 3 are not limited. It should be noted that the number of turns of the wound core 2, the steel plate used for the wound core 3, and the like shown in FIG. 2 and the like are for explanation, and may differ from those of the actual wound core 3.

FIG. 7: is a figure for demonstrating an example of the circuit structure of the transformer 1000 connected to the tap changer TL. In the figure, the circuit configuration of the transformer 1000 corresponds to the portion indicated by the dotted line. Here, the case where the transformer 1000 is used as a step-down transformer is shown. However, the connection of the transformer 1000 may be a connection other than the connection shown in FIG. 7 as long as it can be used as a transformer. In FIG. 7, windings 21 to 22 are the first and second windings that form the first coil 10 described above, and windings 23 to 27 that form the second coil 20 described above. It is assumed that there are three to seven windings.

The terminal (not shown) taken out from any of the terminal take-out portions 2015a to 2015d described above is connected to the so-called tap terminal of the tap changer TL.

A first terminal (not shown) of the first winding 21, a second terminal (not shown) of the first winding 21 and a first terminal (not shown) of the second winding 22. And a second terminal (not shown) of the second winding 22 are secondary terminals provided in a container (not shown) in which the transformer 1000 is housed. It is connected to the positive terminal BS2(+), the ground BS2(G), and the negative terminal BS2(-). As the terminals BS2(+), BS2(G), and BS2(−) provided on the container (not shown), bushings are used here. The voltage between the terminal BS2(+) and the terminal BS2(G) is, for example, 100 to 110V, and the voltage between the terminal BS2(−) and the terminal BS2(G) is, for example, −100 to −110V. is there.

The first terminal T1 of the third winding wire 23 extracted from the terminal extraction portion 2015a is connected to the tap terminal P1 and the second terminal of the third winding wire 23 extracted from the terminal extraction portion 2015b (see FIG. (Not shown) and a first terminal (not shown) of the fourth winding 24, the terminal T2 is connected to the tap terminal P2, and the fourth winding 24 extracted from the terminal extracting portion 2015c. The second terminal (not shown) of the fifth winding 25 and the first terminal (not shown) of the fifth winding 25 are connected to the terminal T3, which is connected to the tap terminal P3 and is taken out from the terminal extracting portion 2015d. The terminal T4 connecting the second terminal (not shown) of the fifth winding 25 and the first terminal (not shown) of the sixth winding 26 is connected to the tap terminal P4. .. Any one of the tap terminals P1 to P4 is connected to the common terminal Pc by the switching piece TC. The common terminal Pc and the second terminal Q1 of the seventh winding 27 are respectively connected to the positive terminal BS1(+) on the primary side and the negative terminal BS1(+) provided on the container (not shown) in which the transformer 1000 is housed. It is connected to the terminal BS1(−). As the terminals BS1(+) and BS1(−) provided in the container (not shown), bushings are used here. Between the terminal BS1(+) and the terminal BS1(-), for example, a high voltage having a potential difference of 6000 V or more is applied from the power system. In such a circuit configuration, tap switching is performed by moving the switching piece TC and changing the tap terminals P1 to P4 connected to the common terminal Pc. The sixth winding wire 26 and the seventh winding wire 27 connected at the terminal T5 function as the main windings of the second coil 20 that cannot be tap-switched.

The transformer 1000 is used by being placed in insulating oil (not shown). The transformer 1000 is, for example, a so-called oil-filled transformer. For example, the transformer 1000 and the tap changer TL are connected as shown in FIG. 7 and housed in a container (not shown) filled with insulating oil. The composition of the insulating oil does not matter.

Next, a method of manufacturing the transformer 1000 will be briefly described. As shown in FIG. 3A, the conductive wire 10 a is wound around the first groove 1011 of the molded first frame body 101, and the first frame body 101 around which the first coil 10 is wound is attached. Create. The terminals of the plurality of windings forming the first coil 10 are appropriately taken out from the terminal take-out portion 1015. Similarly, the conductive wire 20a is wound around the second groove 2011 of the molded second frame body 201 to produce the second frame body 201 around which the second coil 20 is wound. The terminals of the plurality of windings that form the second coil 20 are appropriately taken out from the terminal take-out portion 2015. A known technique can be used for a method of winding the conductor wire 10a and the conductor wire 20a.

The second frame body 201 around which the second coil 20 is wound is not provided with the locking portion 1016 in the through hole 1017 of the first frame body 101 around which the first coil 10 is wound. Inset. A part of the fitted second frame body 201 is engaged with the locking portion 1016, and is assembled integrally with the first frame body 101. The second frame body 201 wound with the second coil 20 is fitted into the through hole 1017 of the first frame body 101, and then the conductive wire 10a is wound around the first groove 1011. One coil 10 may be manufactured.

Inside the first frame body 101, that is, in a state where the second frame body 201 is fitted in the through hole 1017 of the first frame body 101, a pair of adjacent first iron core region 1012 and second iron core region 2012. The semi-cylindrical parts 3011a and 3011b are arranged so as to respectively wrap each pair of and, and these are connected by the connecting means 3012, and as shown in FIG. 3B, a pair of adjacent first iron core regions 1012 and second A pair of cylindrical members 301 arranged so as to respectively wrap the set with the iron core region 2012 is obtained. The cylindrical member 301 is positioned by fitting the concave portion 3014 of the cylindrical member 301 into the protrusion 1014 of the first frame body 101.

By winding a steel plate (not shown) around each of the pair of cylindrical members 301 to provide the pair of wound iron cores 3, a transformer 1000 as shown in FIG. 2 can be obtained. A known technique can be used as a method for winding the steel sheet.

The transformer 1000 assembled in this way is connected to the tap changer TL or the like as shown in FIG. 7, and is housed in a container (not shown) in which the transformer 1000 is arranged. Then, as described above, the terminals (not shown) of the first winding 21 and the second winding 22 of the transformer 1000 have the terminals BS2(+), BS2(G), and BS2 on the secondary side of the container. 7 and the common terminal Pc and the terminal Q1 are connected to the terminals BS1(+) and BS1(−) on the primary side of the container and are filled with insulating oil. It is possible to assemble the transformer 1000 that is connected in the circuit configuration shown in FIG.

As described above, according to the present embodiment, the cross-sectional shape of the second frame body 201 is a shape along the shape of the second groove 2011 provided along the outer circumference of the second frame body 201, and the second frame body 201 and the second groove body 201 are adjacent to each other. By arranging the cylindrical member 301 so as to surround the first iron core region 1012 and the second iron core region 2012, the thickness of the second frame body 201 is reduced and a void is formed in the second frame body 201. It can be made difficult to occur. Accordingly, voids can be made less likely to occur in the second iron core region 2012, which is a region located inside the wound iron core of the second frame body 201 around which the high-voltage coil is wound, and the second frame body 201 can be prevented. In a transformer using, the deterioration of the second frame body 201 is prevented by preventing the discharge generated in the void located between the second coil 20 used as the coil on the high voltage side and the winding core 3. You can In addition, the cylindrical member 301 can provide the wound iron core 3 free from distortion, strain, and disorder of spreading, and thus a high-quality transformer can be provided.

In addition, in the present embodiment, even in a portion other than the second iron core region 2012 of the second frame body 201, by making it difficult for voids to occur, a portion other than the second iron core region 2012 of the second frame body 201. It is possible to prevent electric discharge that occurs in the voids, and to prevent deterioration of the second frame body 201.

Further, according to the present embodiment, the cross-sectional shape of the first frame body 101 is further set to the shape along the shape of the first groove 1011 provided along the outer periphery of the first frame body 101. This makes it possible to reduce the thickness of at least the portion of the first frame body 101 along the inner surface of the first groove 1011 to make it difficult for voids to occur in the first frame body 101. In the transformer using the frame body 101, it is possible to prevent the discharge in the void and prevent the deterioration of the first frame body 101.

Further, according to the present embodiment, the cross-sectional shape of the first frame body 101 is made to be a shape along the shape of the first groove 1011 to reduce the amount of resin required for the first frame body 101. Therefore, the cost can be reduced.

Further, according to the present embodiment, the cross-sectional shape of the second frame body 201 is set to a shape along the shape of the second groove 2011, so that the amount of resin required for the second frame body 201 is reduced. Therefore, the cost can be reduced.

Further, in the present embodiment, by providing the second groove 2011 with a step shape in the width direction, for example, as described above, the terminals of the plurality of windings that form the second coil 20 are It is possible to achieve both the purpose of taking out from the same side of the frame 201 and the purpose of increasing the winding amount of the conductive wire 20a. Further, for example, the second groove 2011 is provided with a step shape in the width direction so that the width of the second groove 2011 can be changed stepwise, and the second groove 2011 is aligned and wound in the second groove 2011. It is possible to easily set the number of turns of each of the plurality of windings forming the second coil 20 by the difference in width due to the step. In this case, it is preferable that the bottom surface of the second groove 2011 is a flat surface as described later. In addition, in the present embodiment, when the second groove 2011 has the step shape in the width direction as described above, the cross-sectional shape of the second frame body 201, particularly the cross-sectional shape of the second iron core region 2012 is Since the shape is in conformity with the shape of the second groove 2011, the winding core 3 appropriately winds the portion of the outer peripheral surface of the second frame body 201 corresponding to the portion having the step shape of the second groove 2011. Since it is not necessary to make the cross-sectional shape to be a part of the cylindrical shape as described above, it is possible to prevent the thickness of the portion having the step shape from increasing, and it is possible to prevent the occurrence of voids. The same effect can be obtained.

In addition, in the present embodiment, by making the bottom surface of the second groove 2011 a flat surface, for example, the number of windings of a plurality of aligned windings that form the second coil 20 is set to the second groove 2011. The width can be easily set. In addition, the bottom surface of the second groove 2011 is a flat surface, and the side surface of the second groove 2011 is perpendicular to the bottom surface, so that, for example, the alignment for configuring the second coil 20 as described above. The terminals of the plurality of wound windings can be taken out from one side wall side of the second groove 2011, that is, from the same side of the second frame 201. In addition, in the present embodiment, when the bottom surface of the second groove 2011 is a flat surface as described above, the cross-sectional shape of the second frame body 201, particularly the cross-sectional shape of the second iron core region 2012 is Since the shape is along the shape of the groove 2011, the portion of the outer peripheral surface of the second frame body 201 corresponding to the flat bottom surface of the second groove 2011 is cylindrical so that the winding core 3 can be appropriately wound. Since it is not necessary to make the shape to be a part of the shape, it is possible to prevent the thickness of the portion corresponding to the bottom surface from being thickened, it is possible to prevent the occurrence of voids, and the same effect as the above is obtained. Obtainable.

In addition, in the above-mentioned embodiment, the one cylindrical member 301 includes the one first iron core region 1012 of the one first frame body 101 and the second frame fitted in the first frame body 101. The case where the body 201 is arranged so as to enclose only the one second iron core region 2012 adjacent to the one first iron core region 1012 described above has been described. However, in the present invention, the one cylindrical member 301 is The two first iron core regions 1012 of the two first frame bodies 101 and the two first iron core regions 1012 respectively fitted into the two first frame bodies 101, respectively The two second iron core regions 2012 adjacent to the iron core region 1012 may be wrapped.

For example, in the above embodiment, the coil bobbin 1 used in a so-called outer iron type transformer in which the winding core 3 is wound around the first coil 10 and the second coil 20 has been described as an example. The present invention may also be applied to the coil bobbin 5 used for a so-called inner iron type transformer in which the first coil 10 and the second coil 20 are wound around the wound iron core. Hereinafter, such a case will be described with an example.

FIG. 8 is a diagram for explaining a modified example of the transformer described in the above embodiment, and is a front view (FIG. 8A) showing an example of an inner iron type transformer, and FIG. It is sectional drawing (FIG.8(b)) by the VIIIb-VIIIb line of a). In the figure, the same reference numerals as those in FIGS. 1 to 6 denote the same or corresponding parts.

The transformer 1005 includes a coil bobbin 5, two first coils 10, two second coils 20, and a winding core 3.

The coil bobbin 5 includes two first frame bodies 101, two second frame bodies 201, and one cylindrical member 301. In addition, here, it is assumed that each of the first frame bodies 101 has one first iron core region 101, and each of the second frame bodies 201 also has one second iron core region 201. The two first frame bodies 101 are arranged such that the first grooves 1011 of the respective first iron core regions 1012 face each other. For example, the two first frame bodies 101 are arranged such that the outer peripheral sides of the first iron core regions 1012 are in contact with each other. The two second frame bodies 201 are fitted into the above two first frame bodies 101, respectively. The cylindrical member 301 includes a first iron core region 1012 of each of the two first frame members 101 arranged so as to face each other and the above-described two second frame members adjacent to the first iron core region 1012. It is arranged so as to enclose the set of the second iron core regions 2012 that each 201 has.

The two first coils 10 are arranged in the first grooves 1011 of the two first frames 101, respectively. Further, the two second coils 20 are arranged in the second grooves 2011 of the two second frames 201, respectively. The method of winding the first coil 10 and the second coil 20 does not matter. Further, each of the first coil 10 and the second coil 20 may be composed of one winding, or may be composed of a plurality of windings. The wound iron core 3 is wound around the cylindrical member 301.

Also in the coil bobbin 5 and the transformer 1005 shown in such a modified example, the cross-sectional shape of the second frame body 201 is changed to the shape of the second groove 2011 provided along the outer circumference of the second frame body 201. Since the cylindrical member 301 is arranged so as to surround the first iron core region 1012 and the second iron core region 2012 which are adjacent to each other, the same effect as that of the above-described embodiment is obtained.

In the case of the outer iron type transformer as described with reference to FIGS. 1 to 6, the upper portions of both side walls of the first groove 1011 of the first frame body 101, that is, the outer peripheral side portion is It is necessary to wind one coil 10 because it is necessary to wind the coil 10, and like the inner iron type transformer shown in FIG. 8, the opened portion is blocked by the other first frame 101 or the like. Therefore, when the cylindrical member 301 is not used, the upper portions of both side walls of the opened first groove 1011 can be an obstacle for winding the winding iron core 3 without distortion or disorder. Therefore, in the coil bobbin used for the outer iron type transformer, by providing the cylindrical member 301 as in the present invention, the wound iron core 3 can be wound without distortion, distortion, or disorder in winding manner. It is possible to obtain a high quality transformer.

In addition, in the above-described embodiment, the cross-sectional shape of the first frame body 101 is a shape along the shape of the first groove 1011 and the cross-sectional shape of the second frame body 201 is the second groove 2011. However, in the present invention, the cross-sectional shape of at least the second frame body 201 of the second core region 2012 is a shape along the second groove 2011. I wish I had it. For example, in the present invention, the cross-sectional shape of the first frame body 101 may or may not be the shape along the shape of the first groove 1011. Of the above, the regions other than the second iron core region 2012 do not have to have the shape along the second groove 2011. As described above, the occurrence of the electric discharge in the void is most likely to occur in the void between the second coil 20 of the second frame body 201 and the winding iron core 3, and therefore at least the second coil 20 and the winding iron core 3 are generated. By making the cross-sectional shape of the second iron core region 2012 of the second frame body 201 located between and the shape along the second groove 2011, it is possible to make it difficult for voids to occur in the portion where discharge is likely to occur. it can. Also in this case, the amount of resin can be reduced.

Further, in the present invention, at least the cross-sectional shape of the second iron core region 2012 of the second frame body 201 located between the second coil 20 and the winding iron core 3 is set to a shape along the second groove 2011. In addition, the cross-sectional shape of the first iron core region 1012 of the first frame body 101, which is a region between the first coil 10 and the wound iron core 3, may be a shape along the first groove 1011. When the generation of the discharge in the void is considered excluding the void of the second frame body 201 between the second coil 20 and the winding core 3, it is wound with the first coil body 10 of the first frame body 101. Since it is considered that a void between the iron core 3 and the iron core 3 is also likely to occur, such a configuration makes it possible to prevent a void from occurring in a portion where discharge is likely to occur. Also in this case, the amount of resin can be reduced.

Further, in the first frame body 101, the portion of the first iron core region 1012 located on the side surface of the first groove 1011 is the region between the first coil 10 and the winding iron core 3, so in the present invention. Alternatively, the cross-sectional shape of at least the side surface side of the first groove 1011 in the first iron core region 1012 of the first frame 101 may be a shape along the first groove 1011. With such a configuration, it is possible to make it difficult for voids to occur in a portion where discharge easily occurs.

In the above embodiment, the case where the first coil 10 is composed of a plurality of windings has been described, but in the present invention, the first coil 10 is composed of one winding. May be. When the first coil 10 is composed of a plurality of windings, the number of windings does not matter. In addition, the plurality of windings may or may not be connected to each other. Further, how to take out the terminals of the plurality of windings and how to connect the plurality of windings does not matter.

Further, in the above embodiment, the case where the second coil 20 is composed of a plurality of windings has been described, but in the present invention, the second coil 20 is composed of one winding. May be. When the second coil 20 is composed of a plurality of windings, the number of windings does not matter. In addition, the plurality of windings may or may not be connected to each other. Further, how to take out the terminals of the plurality of windings and how to connect the plurality of windings does not matter.

In addition, in the above-described embodiment, when the terminals of the plurality of windings of the second coil 20 are all located on one side wall side of the second groove 2011, at least the plurality of terminal lead-out portions 2015 are provided. The second coil 20 is preferably provided on the side where the terminals of the plurality of windings are located.

In addition, in the said embodiment, the case where the front shape of the 1st frame 101 and the 2nd frame 201 had a rectangular shape was demonstrated. However, in the present invention, what is the plan shape of the first frame body 101 as long as it is a shape having one or more first core regions 1012, for example, a shape having sides that can be wrapped with the cylindrical member 301? It does not matter whether it is a perfect shape. Further, similarly, the planar shape of the second frame body 201 is a shape that can be fitted inside the first frame body 101, and the second frame body 201 has a second shape at a position adjacent to each of the one or more first iron core regions 1012. Any shape may be used as long as it has the iron core region 2012.

Moreover, in the said embodiment, the 1st frame 101 has a pair of 1st iron core area|region 1012 which opposes, and the state which fitted the 2nd frame 201 in the through-hole 1017 of the 1st frame 101. Then, regarding the case where the two cylindrical members 301 are arranged so as to wrap each of the two sets of the adjacent first iron core region 1012 and the second iron core region 2012, and the wound iron core 3 is wound around the two cylindrical members 301. Although described, in the present invention, one set of the first core region 1012 and the second core region 2012 which are adjacent to each other in a state where the second frame 201 is fitted in the through hole 1017 of the first frame 101. You may make it arrange|position one cylindrical member 301 so that only one may be wrapped, and wind the winding core 3 around this one cylindrical member 301. In this case, the first frame body 101 only needs to have at least one first iron core region 1012, and the second frame body 201 has at least one second iron core region 2012. It should be.

It is needless to say that the present invention is not limited to the above-mentioned embodiment, and various modifications can be made, and these are also included in the scope of the present invention.

Further, in the above embodiment, the case where the coil bobbin of the present invention is used for the transformer has been described, but the coil bobbin of the present invention is not limited to the coil bobbin used for the transformer, and includes, for example, a coil. It can be widely used for static dielectric devices.

As described above, the coil bobbin according to the present invention is suitable as a coil bobbin used in a transformer having a wound iron core, and particularly useful as a coil bobbin used in a transformer arranged in insulating oil. ..

1, 5 Coil bobbin 3 Winding iron core 10 First coil 20 Second coil 101 First frame body 201 Second frame body 301 Cylindrical member 1000, 1005 Transformer 1011 First groove 1012 First iron core region 2011 Second Groove 2012 Second core area

Claims (9)

A coil bobbin for a transformer,
A first frame body, which is a frame-shaped member in which a first groove in which a coil is arranged is provided along an outer periphery, and which has one or more first core regions which are regions arranged inside a wound core. When,
A frame-shaped member fitted inside the first frame, and a second groove in which a coil on a higher voltage side than a coil arranged in the first groove of the first frame is arranged is It is provided along the outer periphery and has a second core region that is a region arranged inside the wound core at a position adjacent to each of the first core regions, and at least the cross-sectional shape of the second core region. Is a second frame having a shape along the shape of the second groove,
The second frame body, in a state of being fitted inside the first frame body, the first frame body and the second frame body, the adjacent first iron core region and the second iron core region. A cylindrical member arranged so as to wrap ,
The coil bobbin , wherein the second frame body is made of resin, and the thickness of the portion along the shape of the second groove is 4 mm or less . The coil bobbin according to claim 1, wherein the second frame body also has a cross-sectional shape along the shape of the second groove in a region other than the second iron core region. The coil bobbin according to claim 1 or 2, wherein the first frame body has a cross-sectional shape that follows the shape of the first groove. The coil bobbin according to any one of claims 1 to 3, wherein the second groove has a step shape in the width direction. The coil bobbin according to claim 1, wherein a bottom surface of the second groove is flat. Each of the cylindrical members has one first iron core region of the one first frame body and the second frame body fitted in the first frame body, and the one first iron core. The coil bobbin according to any one of claims 1 to 5, wherein the coil bobbin is arranged so as to enclose only one second core region adjacent to the region. The first frame body has two first core regions arranged to face each other,
Two cylindrical members are provided, and the two cylindrical members have the first frame body and the second frame body in a state where the second frame body is fitted inside the first frame body. The coil bobbin according to claim 6, wherein the coil bobbins are arranged so as to respectively enclose two sets of the first core region and the second core region, which are arranged adjacent to each other, of the body. Two first frame bodies are provided, and the two first frame bodies are arranged such that the first grooves of the respective first iron core regions face each other,
It is provided with two said 2nd frame bodies each fitted in the said 2nd 1st frame bodies,
The said cylindrical member has the 1st iron core area|region which each of the said 2nd 1st frame bodies arrange|positioned so that it may oppose, and the 2nd iron core which each of the 2nd 2nd frame bodies respectively adjacent to the said 1st iron core area|region has. The coil bobbin according to claim 1, wherein the coil bobbin is arranged so as to surround the region. A coil bobbin according to any one of claims 1 to 8,
A coil wound around each of the first groove and the second groove of the coil bobbin,
A transformer having a winding core wound around the cylindrical member.

Images