Transformer

Abstract

To provide a transformer in which a core part can be fixed to a case by a simple operation.SOLUTION: In a transformer including: a case 2 storing a core part including a coil; and a fixation member 9 for fixing the core part to the case 2, the fixation member 9 has an inclined plate part 92 becoming closer to the case 2 as the inclined plate part approaches the upper end and also has a holding member 10 located in the inner wall of the case 2 and holding the inclination plate part 92 by engagement with the inclination plate part 92. The holding member 10 has an opposed surface 111 becoming farther from the inner wall as the holding member approaches the lower end and pressed against the inclination plate part 92.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a transformer.

Background Art

[0002] Conventionally, a transformer in which a coil and an iron core are housed in a case and mounted on a pole is widely known. In such a transformer, a core portion including a coil and an iron core is fixed by being bolted to the case via a cover member (see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above transformer, it is desirable that the fixing operation of the core portion be as simple as possible. However, when fixing the core portion by bolting as in Patent Document 1, the bolts have to be aligned with the corresponding nut hole positions and then rotated, which is not an easy operation and takes time.

[0005] The present invention has been made in view of such circumstances, and an object thereof is to provide a transformer capable of fixing a core portion to a case with a simple operation.

Means for Solving the Problems

[0006] The transformer according to the present invention is a transformer including a case in which a core portion including a coil is housed and a fixing member for fixing the core portion to the case, wherein the fixing member has an inclined plate portion that approaches the case as it approaches the upper end, and is provided on an inner wall of the case, and includes a holding member that engages and holds the inclined plate portion, and the holding member has an inclined surface that moves away from the inner wall as it approaches the lower end and is in pressure contact with the inclined plate portion.

Advantages of the Invention

[0007] According to the present invention, a transformer capable of fixing a core portion to a case with a simple operation can be provided.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Modes for Carrying Out the Invention

[0009] Hereinafter, the present invention will be described based on the drawings showing its embodiments. The transformer according to the present embodiment is attached to, for example, the upper part of a telegraph pole.

[0010] (Embodiment 1) FIG. 1 is a schematic diagram showing a main part configuration of a transformer 100 according to Embodiment 1. The transformer 100 includes a case 2 and a core portion 1, and the core portion 1 is housed in the case 2.

[0011] Case 2 is made of metal, has a bottomed cylindrical shape, and the opening of Case 2 is covered by a lid member 8 having a substantially disc shape. Inside Case 2, the core portion 1 is accommodated together with the insulating oil 3.

[0012] The core portion 1 has a wound core 4 and a coil 5. The wound core 4 is a hollow rectangular shape with rounded corners having a pair of vertically extending longitudinally long portions 4a and 4b, and the coils 5 are respectively wound around the longitudinally long portions 4a and 4b.

[0013] On both sides of the wound core 4 in the vertical direction, an upper core clamping fitting 6 (cover member) and a lower core clamping fitting 7 are respectively provided. The upper core clamping fitting 6 and the lower core clamping fitting 7 have a substantially box shape with one side open. The upper core clamping fitting 6 covers the upper end portion of the wound core 4 with the opening facing downward, and the lower core clamping fitting 7 accommodates the lower end portion of the wound core 4 with the opening facing upward.

[0014] In this way, with the upper end portion and the lower end portion of the wound core 4 respectively inserted inside the upper core clamping fitting 6 and the lower core clamping fitting 7, a pair of core clamping bands (not shown) with the lower ends fixed to the lower core clamping fitting 7 fix the wound core 4, the upper core clamping fitting 6, and the lower core clamping fitting 7.

[0015] On the upper surface of the upper core clamping fitting 6, a fixing member 9 for fixing the core portion 1 inside the case 2 is bolted. That is, the fixing member 9 is fixed to the core portion 1 via the upper core clamping fitting 6.

[0016] FIG. 2 is a perspective view illustrating the fixing member 9 of the transformer 100 according to Embodiment 1. The fixing member 9 is, for example, made of metal and has an elongated rectangular plate portion 91 fixed to the upper core clamping fitting 6 and inclined plate portions 92 respectively connected to both ends of the rectangular plate portion 91. The fixing member 9 has the rectangular plate portion 91 and the inclined plate portions 92 integrally formed, forming a substantially U-shaped as a whole, and the inclined plate portions 92 on both ends are held by two holding members 10 provided on the inner wall of the case 2.

[0017] Through holes 95 are respectively formed at both ends in the length direction of the rectangular plate portion 91. The rectangular plate portion 91 is fixed to the upper core clamping fitting 6 by a bolt (not shown) passing through the through hole 95 and screwing into a nut hole (not shown) provided in the upper core clamping fitting 6.

[0018] The inclined plate portion 92 has a rectangular plate shape extending in the vertical direction and is inclined with respect to the rectangular plate portion 91. The inclined plate portion 92 forms an obtuse angle θ with the rectangular plate portion 91. For example, the obtuse angle θ is more than 90° and up to 100°. Specifically, the closer the inclined plate portion 92 is to the upper end, the shorter the distance between it and the inner wall of the case 2 becomes. In other words, in the fixing member 9, the distance L between the inclined plate portions 92 becomes longer as it gets closer to the upper end of the inclined plate portion 92, that is, as it gets farther from the base end portion of the inclined plate portion 92.

[0019] As described above, holding members 10 for holding the inclined plate portions 92 of the fixing member 9 by engagement are attached to the inner wall of the case 2. The holding members 10 are respectively fixed by welding at positions corresponding to the respective inclined plate portions 92 of the fixing member 9. That is, the holding members 10 are arranged opposite to each other in the length direction of the rectangular plate portion 91 of the fixing member 9.

[0020] FIG. 3 is a perspective view illustrating the holding member 10 of the transformer 100 according to Embodiment 1, and FIG. 4 is a longitudinal sectional view taken along line IV-IV of FIG. 3. In FIG. 4, for convenience, the case 2 is shown by a two-dot chain line.

[0021] The holding member 10 is made of metal and has a rectangular plate portion 11 provided obliquely with respect to the inner wall of the case 2 (see FIG. 4). The rectangular plate portion 11 extends in the vertical direction, and the width of the rectangular plate portion 11 is substantially the same as the width of the inclined plate portion 92 of the fixing member 9. In the rectangular plate portion 11, both the opposing surface 112 facing the inner wall of the case 2 and the opposing surface 111 (inclined surface) on the side opposite to the opposing surface 112 are flat surfaces, and are inclined with respect to the inner wall of the case 2. The opposing surface 111 and the opposing surface 112 are provided such that the distance from the inner wall of the case 2 gradually becomes shorter as it approaches the upper end and gradually becomes longer as it approaches the lower end. The maximum distance between the opposing surfaces 111 in the opposing direction is shorter than the maximum distance L between the inclined plate portions 92 of the fixing member 9 before being held. When the fixing of the core portion 1 to the case 2 is completed, the opposing surface 111 abuts against the inclined plate portion 92 of the fixing member 9.

[0022] In the rectangular plate portion 11, holding spring portions 12 are continuously provided at both long side edges that oppose each other in the width direction intersecting the length direction, that is, in the intersecting direction orthogonal to the vertical direction. The holding spring portions 12 are provided in a range excluding the lower end portions of the long side edges. The holding spring portions 12 hold the rectangular plate portion 11 in a state separated from the inner wall of the case 2 as shown in FIG. 4.

[0023] Each holding spring portion 12 extends in the vertical direction and has a semi-cylindrical bent portion 121 with one edge in the circumferential direction continuously provided to the rectangular plate portion 11, and a leg plate portion 122 extending from the other edge of the bent portion 121 in the thickness direction of the rectangular plate portion 11. The edge portion of the leg plate portion 122 is fixed to the inner wall of the case 2 by welding. The bent portion 121 is convexly curved toward the opposing surface 111 side. The dimension of the leg plate portion 122 in the extending direction gradually becomes longer as it goes downward. As a result, the distance between the rectangular plate portion 11 and the inner wall of the case 2 gradually becomes longer as it goes downward as described above, and the rectangular plate portion 11 is inclined with respect to the inner wall of the case 2.

[0024] Also, in the rectangular plate portion 11, lateral movement restricting portions 13 are continuously provided at the lower end portions of both long side edges. The lateral movement restricting portions 13 restrict the movement of the inclined plate portion 92 of the fixing member 9 in the intersecting direction (width direction).

[0025] Each lateral movement restricting portion 13 projects from the long side edge of the rectangular plate portion 11 toward the opposite surface 111 side in the thickness direction of the rectangular plate portion 11. The lateral movement restricting portion 13 is substantially rectangular, and the base end portion is curved. Also, when the core portion 1 is accommodated in the case 2, the inclined plate portion 92 of the fixing member 9 is sandwiched between the lateral movement restricting portions 13, and the vertical movement of the fixing member 9 is guided. After the assembly is completed, when the holding member 10 holds the inclined plate portion 92 of the fixing member 9, that is, in a state where the opposite surface 111 abuts against the inclined plate portion 92 of the fixing member 9 (see FIG. 5), the movement of the inclined plate portion 92 in the crossing direction is prevented by the lateral movement restricting portion 13. In the above, the case where the base end portion of the lateral movement restricting portion 13 is curved has been described as an example, but it is not limited to this, and a configuration bent vertically may be acceptable.

[0026] And in the rectangular plate portion 11, vertical movement restricting portions 14 are continuously provided on the upper short side edge among the both short side edges facing each other in the vertical direction. The vertical movement restricting portion 14 restricts the movement of the inclined plate portion 92 of the fixing member 9 in the vertical direction (length direction).

[0027] The vertical movement restricting portion 14 projects from the short side edge of the rectangular plate portion 11 toward the opposite surface 111 side in the thickness direction of the rectangular plate portion 11. The vertical movement restricting portion 14 is substantially rectangular, and the base end portion is curved. Therefore, after the assembly is completed, when the holding member 10 holds the inclined plate portion 92 of the fixing member 9 (see FIG. 5), the movement of the inclined plate portion 92 in the vertical direction is prevented by the vertical movement restricting portion 14. Note that the rectangular plate portion 11, the holding spring portion 12, the lateral movement restricting portion 13, and the vertical movement restricting portion 14 are integrally formed.

[0028] Since it has the configuration as described above, in the transformer 100 according to Embodiment 1, the work of fixing the core portion 1 accommodated in the case 2 to the case 2 (holding member 10) via the fixing member 9 becomes easy.

[0029] FIG. 5 is an explanatory diagram for explaining the process in which the core portion 1 is attached to the case 2 in the transformer 100 according to Embodiment 1. In FIG. 5, for convenience, the fixing member 9 and the case 2 are shown by a two-dot chain line.

[0030] The core part 1 is lowered from the opening of the case 2 to the bottom of the case 2. For example, the core part 1 is lifted by a crane or the like via the fixing member 9 and gradually descends inside the case 2. At this time, the inclined plate part 92 of the fixing member 9 abuts against the vertical movement restricting part 14 of the holding member 10 and bends inward. As described above, the inclined plate part 92 is provided obliquely from the rectangular plate part 91 toward the case 2 side, and the maximum distance between the opposite surfaces 111 is shorter than the maximum distance L between the inclined plate parts 92 of the fixing member 9 before being held. Therefore, although the rectangular plate part 91 can pass through between the holding members 10, the inclined plate part 92 abuts against the vertical movement restricting part 14 and is pressed inward. At this time, a restoring force acts on the vertical movement restricting part 14 due to the deformation. Thereafter, the descent of the core part 1 continues. When the fixing member 9 (core part 1) descends, the inclined plate part 92 passes between the lateral movement restricting parts 13, the vertical movement of the fixing member 9 is guided, and the position of the fixing member 9 (core part 1) is determined. When the inclined plate part 92 descends below the vertical movement restricting part 14, the pressing by the vertical movement restricting part 14 disappears, so the inclined plate part 92 returns to its original shape by the restoring force (see the white arrow in FIG. 5). At this time, the upper part of the inclined plate part 92 engages with the holding member 10 and is held by the holding member 10.

[0031] That is, at the upper part of the inclined plate part 92, the surface facing the holding member 10 is in pressure contact with the opposite surface 111 of the rectangular plate part 11, and the upper side edge and the two side edges in the intersecting direction are respectively surrounded by the vertical movement restricting part 14 and the lateral movement restricting part 13. Since the upper part of the inclined plate part 92 is in pressure contact with the opposite surface 111 of the rectangular plate part 11, the core part 1 is held by the case 2 via the holding member 10. Since the upper side edge and the two side edges in the intersecting direction of the inclined plate part 92 are respectively surrounded by the vertical movement restricting part 14 and the lateral movement restricting part 13, the movement of the fixing member 9 (core part 1) in the vertical direction and the intersecting direction is prevented.

[0032] As described above, when fixing the core part 1 to the case 2, the transformer 100 according to Embodiment 1 does not require a separate fixing operation such as bolting, and only needs to engage the inclined plate part 92 of the fixing member 9 with the holding member 10. Thereby, in the transformer 100 according to Embodiment 1, the operation of fixing the core part 1 to the case 2 becomes simple, and the workability is improved.

[0033] Further, in the transformer 100 according to Embodiment 1, as described above, in the fixing member 9, the rectangular plate portion 91 and the two inclined plate portions 92 are integrated, and the inclined plate portions 92 are not provided separately. Therefore, the number of parts can be reduced compared to the case where the inclined plate portions 92 are provided separately, and the relative positioning between the inclined plate portions 92 becomes easy.

[0034] And, in the transformer 100 according to Embodiment 1, holding springs 12 are provided at both long side edges of the rectangular plate portion 11. Therefore, when the position of the rectangular plate portion 11 is changed in the direction of approaching and separating from the inner wall of the case 2, a restoring force acts on the holding springs 12, and the rectangular plate portion 11 is biased in the direction of returning to the original position. Therefore, the pressure contact state can be maintained between the upper portion of the inclined plate portion 92 and the opposite surface 111 of the rectangular plate portion 11. In addition, since the position of the rectangular plate portion 11 can be changed in the direction of approaching and separating from the inner wall of the case 2, the design tolerances in the fixing member 9 or the holding member 10 can be absorbed.

[0035] (Modification) FIG. 6 is an explanatory view for explaining a modification of the transformer 100 according to Embodiment 1. In FIG. 6, for convenience of explanation, the holding member 10 and the fixing member 9 are shown in a cross-sectional view, and the case 2 is shown by a two-dot chain line. Further, FIG. 6 shows the middle of the process in which the core portion 1 is lowered from the opening of the case 2 to the bottom of the case 2.

[0036] In the transformer 100 according to the modification, a groove 93 is formed in the inclined plate portion 92 of the fixing member 9. The groove 93 is formed in the opposing surface 94 of the inclined plate portion 92 with respect to the holding member 10, and is formed at the center of the opposing surface 94 in the width direction of the inclined plate portion 92. The groove 93 has the bottom of a concave curved surface, and extends in the vertical direction from the upper end of the inclined plate portion 92 to the bend between the inclined plate portion 92 and the rectangular plate portion 91. Further, the groove 93 is formed so that the depth becomes shallower as it approaches the rectangular plate portion 91.

[0037] Also, in the transformer 100 according to the modified example, a protrusion 117 (guide protrusion) is provided on the vertical movement restricting portion 14 of the holding member 10. The protrusion 117 is, for example, spherical, and protrudes from the tip surface of the vertical movement restricting portion 14 at the central portion in the intersecting direction. When the core portion 1 is lowered from the opening of the case 2 to the bottom of the case 2, the protrusion 117 engages with the groove 93 of the inclined plate portion 92. That is, the protrusion 117 is provided at a position corresponding to the groove 93 of the inclined plate portion 92 in the intersecting direction. Other configurations of the fixing member 9 and the holding member 10 have already been described in the first embodiment, and detailed descriptions thereof are omitted.

[0038] When the core portion 1 is lowered from the opening of the case 2 to the bottom of the case 2, as described above, the inclined plate portion 92 of the fixing member 9 hits the vertical movement restricting portion 14 of the holding member 10 and bends inward. At this time, since the protrusion 117 of the vertical movement restricting portion 14 engages with the groove 93 of the inclined plate portion 92, the movement of the fixing member 9 (inclined plate portion 92) in the intersecting direction is restricted. As a result, the vertical movement of the fixing member 9 (inclined plate portion 92) is guided, and when the fixing member 9 (inclined plate portion 92) continues to descend, the inclined plate portion 92 is guided between the lateral movement restricting portions 13. As described above, since the lateral movement restricting portion 13 further guides the vertical movement of the inclined plate portion 92, the position of the fixing member 9 is determined, and the upper portion of the inclined plate portion 92 is engaged with the holding member 10 (see FIG. 5).

[0039] As described above, in the transformer 100 according to the modified example, during the process of housing the core portion 1 in the case 2, in addition to the lateral movement restricting portion 13, the vertical movement of the fixing member 9 is also guided by the protrusion 117 of the holding member 10. Therefore, the upper portion of the inclined plate portion 92 can be engaged with the holding member 10 more reliably and quickly.

[0040] In the transformer 100 according to the modified example, the case where the groove 93 is formed from the upper end of the inclined plate portion 92 to the bent portion in the fixing member 9 has been described as an example, but it is not limited thereto. For example, a so-called throw-away hole may be formed in the bent portion of the fixing member 9. In this case, such a throw-away hole can avoid stress concentration during deformation of the inclined plate portion 92.

[0041] In the above description, the case where the depth of the groove 93 becomes shallower as it approaches the rectangular plate portion 91 has been described, but the present invention is not limited to this. The dimension (width dimension) of the groove 93 in the crossing direction may be configured to become narrower as it approaches the rectangular plate portion 91.

[0042] (Embodiment 2) The transformer 100 according to Embodiment 2 includes a core portion 1, a case 2, a fixing member 9, and a holding member 10, similar to Embodiment 1. Since the core portion 1, the case 2, and the fixing member 9 of the transformer 100 according to Embodiment 2 are the same as those in Embodiment 1, detailed descriptions thereof are omitted, and hereinafter, only the holding member 10 will be described.

[0043] FIG. 7 is a perspective view illustrating the holding member 10 of the transformer 100 according to Embodiment 2, and FIG. 8 is a view taken along the arrow VIII in FIG. 7. In FIG. 8, for the sake of convenience, the inclined plate portion 92 of the fixing member 9 is shown by a two-dot chain line.

[0044] The holding member 10 has a rectangular plate portion 11 provided obliquely with respect to the inner wall of the case 2. The rectangular plate portion 11 extends in the vertical direction, and the width of the rectangular plate portion 11 is substantially the same as the width of the inclined plate portion 92 of the fixing member 9. Both the opposing surface 112 and the opposite surface 111 of the rectangular plate portion 11 are flat surfaces and are inclined with respect to the inner wall of the case 2. The opposite surface 111 and the opposing surface 112 are provided such that the distance from the inner wall of the case 2 gradually becomes shorter as it approaches the upper end and gradually becomes longer as it approaches the lower end.

[0045] In the rectangular plate portion 11, holding spring portions 12A are continuously provided at both long edges, respectively. The holding spring portions 12A are provided over the entire range of the long edges of the rectangular plate portion 11. The holding spring portions 12A hold the rectangular plate portion 11 in a state separated from the inner wall of the case 2.

[0046] Each holding spring portion 12A extends in the vertical direction and has a semi-cylindrical bending portion 121A whose one circumferential edge is connected to the rectangular plate portion 11 and a foot plate portion 122A extending from the other edge of the bending portion 121A in the thickness direction of the rectangular plate portion 11. The bending portion 121A is convexly curved toward the opposite surface 111 side and is provided such that the radius becomes larger as it approaches the lower end of the holding spring portion 12A. That is, the closer to the lower end of the holding spring portion 12A, the more the bending portion 121A protrudes greatly from the opposite surface 111. More specifically, in the holding spring portion 12A, the dimension M from the surface along the opposite surface 111 to the ridge line connecting the vertices of the bending portion 121A becomes longer as it approaches the lower end (see FIG. 8). For example, the dimension M at the lower end portion (lateral movement restricting portion) of the holding spring portion 12A is equal to or greater than the thickness of the inclined plate portion 92 shown in FIG. 8. Also, the dimension of the foot plate portion 122A in the extending direction gradually becomes longer as it approaches the lower end of the holding spring portion 12A.

[0047] As a result, the distance between the rectangular plate portion 11 and the inner wall of the case 2 gradually increases downward as described above, and the rectangular plate portion 11 is inclined with respect to the inner wall of the case 2. Also, when the core portion 1 is housed in the case 2, the inclined plate portion 92 of the fixing member 9 is sandwiched between the lower end portions of the holding spring portions 12A, and the vertical movement of the fixing member 9 is guided. Then, after the assembly is completed, when the holding member 10 holds the inclined plate portion 92 of the fixing member 9, the movement of the inclined plate portion 92 in the intersecting direction is prevented by the lower end portion of the holding spring portion 12A.

[0048] Furthermore, the vertical movement restricting portion 14 connected to the upper short edge of the rectangular plate portion 11 protrudes in the thickness direction of the rectangular plate portion 11 from the short edge of the rectangular plate portion 11 toward the opposite surface 111 side. The vertical movement restricting portion 14 restricts the vertical (length direction) movement of the inclined plate portion 92 of the fixing member 9.

[0049] In order to accommodate the core part 1 in the case 2, when the core part 1 is lowered into the case 2 from the opening of the case 2, although the rectangular plate part 91 can pass through between the holding members 10, the inclined plate part 92 hits the vertical movement restricting part 14 and is pressed inward, bending inward. Thereafter, the lowering of the core part 1 continues. When the fixing member 9 (core part 1) descends, the inclined plate part 92 passes between the lower ends of the holding spring parts 12A, and the vertical movement of the fixing member 9 is guided, and the position of the fixing member 9 (core part 1) is determined. When the inclined plate part 92 drops below the vertical movement restricting part 14, the pressing of the vertical movement restricting part 14 disappears, so the inclined plate part 92 returns to its original shape. At this time, the upper part of the inclined plate part 92 engages with the holding member 10 and is held by the holding member 10.

[0050] That is, at the upper part of the inclined plate part 92, the facing surface with the holding member 10 is in pressure contact with the opposite surface 111 of the rectangular plate part 11, and the upper side edge and both side edges in the intersecting direction are respectively surrounded by the vertical movement restricting part 14 and the lower ends of the holding spring parts 12A. Since the upper part of the inclined plate part 92 is in pressure contact with the opposite surface 111 of the rectangular plate part 11, the core part 1 is held by the case 2 via the holding member 10. Since the upper side edge and both side edges in the intersecting direction of the inclined plate part 92 are respectively surrounded by the vertical movement restricting part 14 and the lower ends of the holding spring parts 12A, the movement of the fixing member 9 (core part 1) in the vertical direction and the intersecting direction is prevented.

[0051] Therefore, also in the transformer 100 according to the second embodiment, as in the first embodiment, when fixing the core part 1 to the case 2, it is only necessary to engage the inclined plate part 92 of the fixing member 9 with the holding member 10. Thereby, the transformer 100 according to the second embodiment simplifies the configuration, makes the operation of fixing the core part 1 to the case 2 easy, and improves the workability.

[0052] For parts similar to those in the first embodiment, the same reference numerals are given and detailed descriptions are omitted.

[0053] (Embodiment 3) The transformer 100 according to Embodiment 3 includes a core portion 1, a case 2, a fixing member 9, and a holding member 10, similar to Embodiment 1. Since the core portion 1, the case 2, and the fixing member 9 of the transformer 100 according to Embodiment 3 are the same as those in Embodiment 1, detailed descriptions thereof are omitted, and hereinafter, only the holding member 10 will be described.

[0054] FIG. 9 is a perspective view illustrating the holding member 10 of the transformer 100 according to Embodiment 3, and FIG. 10 is a longitudinal sectional view taken along the line X-X of FIG. 9. In FIG. 10, for convenience, the inclined plate portion 92 of the fixing member 9 and the case 2 are shown by two-dot chain lines.

[0055] The holding member 10 has a rectangular plate portion 11B facing the inner wall of the case 2. The rectangular plate portion 11B extends in the vertical direction, and the width of the rectangular plate portion 11B is wider than the width of the inclined plate portion 92 of the fixing member 9. In the rectangular plate portion 11B, a recess 113 having a shape following the upper end portion of the inclined plate portion 92 is formed on the opposite surface 111B opposite to the facing surface 112B facing the inner wall of the case 2.

[0056] The recess 113 has a rectangular bottom surface 116 (inclined surface). The bottom surface 116 is a rectangle extending in the vertical direction, and the dimension in the width direction is slightly larger than the dimension in the width direction of the inclined plate portion 92 of the fixing member 9. That is, the upper end portion of the inclined plate portion 92 can be accommodated in the recess 113. Further, as shown in FIG. 10, the bottom surface 116 is inclined with respect to the inner wall of the case 2. The bottom surface 116 is provided such that the distance from the inner wall of the case 2 gradually decreases as it approaches the upper end and gradually increases as it approaches the lower end.

[0057] In addition, the recess 113 has lateral side surfaces 114 (lateral movement restricting portions) that stand vertically with respect to the bottom surface 116 on both long sides in the width direction of the bottom surface 116. As described above, since the bottom surface 116 is inclined, the dimension of each lateral side surface 114 in the direction perpendicular to the bottom surface 116 becomes smaller as it approaches the lower end of the rectangular plate portion 11B. And the recess 113 has a longitudinal side surface 115 (longitudinal movement restricting portion) that stands vertically with respect to the bottom surface 116 on the upper short side of the two short sides of the bottom surface 116.

[0058] Also in the transformer 100 according to Embodiment 3, similar to Embodiment 1, two holding members 10 are arranged to face each other, and the maximum distance between the bottom surfaces 116 in such a facing direction is shorter than the maximum distance L between the inclined plate portions 92 of the fixing member 9 before being held.

[0059] In addition, holding spring portions 12B are continuously provided at both long edge portions of the rectangular plate portion 11B. The holding spring portions 12B are provided over the entire range of the long edge portion of the rectangular plate portion 11B. The holding spring portions 12B hold the rectangular plate portion 11B in a state of being separated from the inner wall of the case 2.

[0060] Each holding spring portion 12B extends in the vertical direction and has a semi-cylindrical bent portion 121B whose one edge in the circumferential direction is continuously provided to the rectangular plate portion 11B, and a leg plate portion 122B extending in the thickness direction of the rectangular plate portion 11B from the other edge of the bent portion 121B. The bent portion 121B is convexly curved toward the opposite surface 111B side. The dimension of the leg plate portion 122B in the extending direction is constant in the vertical direction.

[0061] To accommodate the core portion 1 in the case 2, when the core portion 1 is lowered into the case 2 from the opening of the case 2, the inclined plate portion 92 of the fixing member 9 hits the edge of the vertical side surface 115 of the concave portion 113 and bends inward. As described above, the maximum distance between the bottom surfaces 116 is shorter than the maximum distance L between the inclined plate portions 92 of the fixing member 9 before being held. Therefore, although the rectangular plate portion 91 can pass through between the holding members 10, the inclined plate portion 92 hits the edge on the opposite surface 111B side of the vertical side surface 115 and is pressed inward. At this time, a restoring force acts on the vertical movement restricting portion 14 due to the deformation. Thereafter, the lowering of the core portion 1 continues, and when the inclined plate portion 92 of the fixing member 9 drops below the vertical side surface 115, the pressing by the edge of the vertical side surface 115 disappears, so the inclined plate portion 92 returns to its original shape by the restoring force. At this time, the upper portion of the inclined plate portion 92 engages with the concave portion 113 and is held by the concave portion 113.

[0062] That is, at the upper part of the inclined plate portion 92, the surface facing the bottom surface 116 is in pressure contact with the bottom surface 116 of the concave portion 113, and the upper side edge and both side edges in the intersecting direction are respectively surrounded by the vertical side surface 115 and the horizontal side surface 114. Since the upper part of the inclined plate portion 92 is in pressure contact with the bottom surface 116 of the concave portion 113, the core portion 1 is held by the case 2 via the holding member 10. Since the upper side edge of the inclined plate portion 92 and both side edges in the intersecting direction are respectively surrounded by the vertical side surface 115 and the horizontal side surface 114, the movement of the fixing member 9 (core portion 1) in the vertical direction and the intersecting direction is prevented.

[0063] Therefore, also in the transformer 100 according to the third embodiment, as in the first embodiment, when fixing the core portion 1 to the case 2, it is only necessary to engage the inclined plate portion 92 of the fixing member 9 with the holding member 10. As a result, the transformer 100 according to the third embodiment simplifies the configuration, and the work of fixing the core portion 1 to the case 2 becomes easy, improving the workability.

[0064] For the parts similar to those in the first embodiment, the same reference numerals are given and the detailed description is omitted.

[0065] In the above description, the case where the rectangular plate portion 91 and the two inclined plate portions 92 are integrated in the fixing member 9 has been described as an example, but it is not limited thereto. The rectangular plate portion 91 may be omitted and the inclined plate portions 92 may be provided independently.

[0066] The technical features (constitutive elements) described in the first to third embodiments can be combined with each other, and by combining them, new technical features can be conceived. The embodiments disclosed this time should be considered as illustrative in all respects and not restrictive. The scope of the present invention is shown not by the above meaning but by the scope of the claims, and it is intended that all modifications within the meaning and scope equivalent to the scope of the claims are included.

[0067] The matters described in each embodiment can be combined with each other. Also, the independent claims and dependent claims described in the claims can be combined with each other in all possible combinations regardless of the citation form. Further, although the claims use a form (multi-claim form) of describing claims that cite two or more other claims, it is not limited to this. A form of describing a multi-claim (multi-multi-claim) that cites at least one multi-claim may be used.

Description of Reference Numerals

[0068] 1: Core part, 2: Case, 4: Winding core, 5: Coil, 6: Upper core clamping fitting (cover member), 7: Lower core clamping fitting, 9: Fixed member, 10: Holding member, 11, 11B: Rectangular plate part, 12, 12A, 12B: Holding spring part, 13: Lateral movement limiting part, 14: Vertical movement limiting part, 91: Rectangular plate part, 92: Inclined plate part, 93: Groove, 94: Opposing surface, 100: Transformer, 111: Opposite surface (inclined surface), 114: Lateral side surface, 115: Vertical side surface, 116: Bottom surface, 117: Protrusion

Claims

1. A transformer comprising a case housing a core portion including a coil, and a fixing member for fixing the core portion to the case, wherein the fixing member has an inclined plate portion that approaches the case as it approaches the upper end, and is provided with a holding member on the inner wall of the case for engaging and holding the inclined plate portion, wherein the holding member has an inclined surface that moves away from the inner wall as it approaches the lower end and presses against the inclined plate portion.

2. The holding member, has a rectangular plate portion having the inclined surface, and a holding spring portion for holding the rectangular plate portion separated from the inner wall. The transformer according to claim 1.

3. comprises a cover member covering the upper portion of the core portion, wherein the fixing member has a rectangular plate portion fixed to the cover member, and the inclined plate portions are respectively provided at both ends of the rectangular plate portion. The transformer according to claim 1.

4. The holding member has a vertical movement restricting portion for restricting the vertical movement of the inclined plate portion. The transformer according to claim 1.

5. The holding member has a lateral movement restricting portion for restricting the movement of the inclined plate portion in a direction intersecting the vertical direction. The transformer according to claim 1.

6. the inclined plate portion has a groove extending in the vertical direction on the surface facing the holding member, and the holding member has a guide protrusion for guiding the vertical movement of the inclined plate portion by engaging with the groove at a position corresponding to the groove in the intersecting direction. The transformer according to any one of claims 1 to 5.

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