Transformer

Abstract

To enable prevention of falling of a support member nipped by a winding and a frame.SOLUTION: A transformer (1) comprises: an iron core (10); a winding (20) of which a shaft direction is directed to a vertical direction so as to be arranged to a periphery of the iron core; a frame (40) that supports an upper part and a lower part of the iron core and the winding; and a support member (50) that is provided to an upper surface side and a lower surface side of the winding, and is arranged while being nipped by the winding and frame. The frame comprises a support surface part (42b) that nips the winding and the support member from the vertical direction. A hole (42c) is formed to the support surface part. The support member comprises: a main body (51) that is arranged between the winding and the support surface part; and a pin (52) that is inserted via a gap (S) into the hole so as to be projected from a mating opposite side with the support surface part in the main body. In a state where the support member is rotated and deviated by setting an outer edge as a center (C1) of a surface that is opposite to the support surface part in the main body, a pin contacts in a formation region on both sides while nipping a center shaft (C2) in the hole.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a transformer in which a winding is supported via a frame. [Background technology]

[0002] Patent Document 1 discloses a transformer including a lower frame, a coil provided on the upper part of the lower frame, an upper frame provided on the upper part of the coil, and a spacer interposed between the coil and the upper frame or the lower frame. This transformer is provided with a protrusion. The protrusion protrudes a certain height above the upper part of the lower frame and is inserted into a groove provided at the lower end of the spacer, and serves as a member that prevents the spacer supporting the coil from coming off. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-67710 A Summary of the Invention [Problem to be solved by the invention]

[0004] In a transformer, when vibrations occur due to an earthquake or the like, not only a horizontal force acts on the spacer, but also a force acts in a direction that rotates and displaces the spacer about the outer edge of its lower end, causing it to fall over. In Patent Document 1, when a horizontal force acts on the spacer, the projections and grooves can regulate the horizontal displacement of the spacer, but when a force acts on the spacer in a direction that causes it to fall over, the projections come out of the grooves, making the spacer more likely to fall off from between the coil and the frame.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and has an object to provide a transformer that can prevent a support member sandwiched between the winding and the frame from falling off. [Means for solving the problem]

[0006] The transformer of the present invention comprises an iron core, a winding arranged around the iron core with its axial direction oriented in a vertical direction, a frame supporting the iron core and the upper and lower parts of the winding, and a support member provided on at least one of the upper and lower sides of the winding and sandwiched between the winding and the frame, wherein the frame has a support surface portion that sandwiches the winding and the support member from above and below, and a hole is formed in the support surface portion, and the support member comprises a main body arranged between the winding and the support surface portion, and a pin that protrudes from the side of the main body facing the support surface portion and is inserted into the hole via a gap, and when the support member is rotationally displaced around the outer edge of the surface of the main body facing the support surface portion, the pin abuts against formation areas on both sides sandwiching the central axis of the hole. Effect of the Invention

[0007] According to the present invention, even if a force in the direction of the rotational displacement described above acts on the spacer member due to an external force such as an earthquake, the pins can be kept in contact with the holes at least at two positions. This contact can restrict large rotational displacement of the spacer member and prevent the support member from falling off from between the windings and the frame. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a front view of a transformer according to a first embodiment, with a portion of the configuration thereof omitted. [Diagram 2] FIG. 1 is a perspective view of a transformer according to a first embodiment, with a portion of the configuration omitted. [Diagram 3] 2 is a cross-sectional view taken along line AA in FIG. 1. [Figure 4] FIG. 4A is an enlarged view of part B in FIG. 3, and FIG. 4B is an enlarged view for explaining a state in which the support member has been rotationally displaced. [Diagram 5] 5A and 5B are similar illustrations to FIGS. 4A and 4B of a transformer according to a second embodiment. [Figure 6]6A and 6B are similar illustrations to FIGS. 4A and 4B of a transformer according to a third embodiment. [Figure 7] 7A and 7B are similar illustrations to those of FIGS. 4A and 4B of a transformer according to a fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] A transformer according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings. Note that the following describes the case where the present invention is applied to a molded transformer. However, the application of the present invention is not limited to molded transformers and can be changed as appropriate. For example, the present invention can be applied to oil-filled transformers, dry-type transformers other than molded transformers (e.g., H-type dry-type transformers, etc.), and gas-insulated transformers.

[0010] [First embodiment] Fig. 1 is a front view of a transformer according to a first embodiment, with some of the configuration omitted. As shown in Fig. 1, the transformer 1 includes an iron core 10 that constitutes a magnetic circuit, a winding 20 that constitutes an electric circuit, and a frame 40 that accommodates a part of the iron core 10. Fig. 1 shows a three-phase, three-legged transformer 1 in which the upper and lower parts of the three windings 20 and the iron core 10 are supported by the frame 40. Note that the structure of the transformer to which the present invention is applicable is not limited to this, and the present invention can be applied to a transformer 1 having any structure, such as a three-phase, five-legged structure.

[0011] The iron core 10 is, for example, a wound core formed by winding electromagnetic steel sheets in multiple layers and forming a generally rectangular shape in front view. A pair of openings 10a, 10b are formed in the iron core 10, which penetrates perpendicularly to the lamination direction of the electromagnetic steel sheets. The iron core 10 is provided in a shape including a plurality of legs 11-13 (three in this embodiment) extending in the vertical direction, an upper yoke portion 14 connecting the upper ends of the legs 11-13, which are one end, and a lower yoke portion 15 connecting the lower ends of the legs 11-13, which are the other end. The iron core 10 may be a stacked core instead of a wound core, and the material is not particularly limited, and may be an amorphous alloy thin strip.

[0012] Fig. 2 is a perspective view of the transformer according to the first embodiment with some of the configuration omitted. As shown in Fig. 2, three windings 20 are arranged around the legs 11-13 of the core 10, with their axial directions facing up and down. Each winding 20 has an inner winding 21 and an outer winding 22, and the inner winding 21 and the outer winding 22 are molded windings formed by covering a cylindrical winding body (not shown) around which a conductor is wound with a resin. As such a resin, for example, an epoxy resin having excellent heat resistance and electrical insulation properties is used.

[0013] The outer winding 22 is a primary winding that provides high voltage on the power source side, and the inner winding 21 is a secondary winding that provides low voltage on the load side. The inner winding 21 and the outer winding 22 of each winding 20 are concentrically arranged around each of the legs 11 to 13 of the iron core 10.

[0014] Fig. 3 is a cross-sectional view taken along line AA in Fig. 1. As shown in Fig. 1 and Fig. 3, frame 40 has an upper frame 41 and a lower frame 42. Frame 40 functions as a jig during assembly of transformer 1, and also protects and supports core 10 and windings 20 after assembly is complete.

[0015] The upper frame 41 has a box-shaped frame body 41a that is open downward, and is configured to be able to accommodate the upper yoke portion 14 of the core 10 inside the frame body 41a. The upper frame 41 also has a support surface portion 41b that protrudes outward from the lower end, which is the opening side of the frame body 41a. The support surface portion 41b is oriented in a substantially horizontal direction, and is positioned above the upper surface of the winding 20.

[0016] The lower frame 42 has a box-shaped frame main body 42a that is open on the upward side, and is configured so that the bottom yoke portion 15 of the core 10 can be housed inside the frame main body 42a. The lower frame 42 also has a support surface portion 42b that protrudes outward from the upper end, which is the opening side of the frame main body 42a. The support surface portion 42b is oriented in a substantially horizontal direction, and is disposed below the lower surface of the winding 20.

[0017] A plurality of support members 50 are provided on both the upper and lower sides of the winding 20. The support members 50 are arranged radially around the center of the winding 20 when the winding 20 is viewed from above. The support members 50 provided on the upper side of the winding 20 are arranged between the upper surface of the winding 20 and the support surface portion 41b of the upper frame 41. The support members 50 provided on the lower side of the winding 20 are arranged between the lower surface of the winding 20 and the support surface portion 42b of the lower frame 42. Thus, the support surface portions 41b, 42b are arranged to sandwich the winding 20 and the support members 50 from above and below.

[0018] Next, the support member 50 and its surrounding structure will be described. The support members 50 on the upper and lower sides of the winding 20 have the same structure using common parts and are arranged symmetrically with their vertical orientations reversed. The surrounding structures of the support members 50 on the upper and lower sides of the winding 20 are also symmetrical with their vertical orientations reversed. Therefore, in the following, the support member 50 and its surrounding structure surrounded by the two-dot chain circle indicated by the symbol B in Fig. 3 will be illustrated and described using Fig. 4, and detailed descriptions of other support members 50 and their surrounding structures will be omitted.

[0019] Fig. 4A is an enlarged view of part B in Fig. 3. As shown in Fig. 4A, support member 50 includes a main body 51 disposed between the lower surface of winding 20 and the upper surface of support surface portion 42b, and a pin 52 provided to protrude from the lower surface side of main body 51 that faces support surface portion 42b. Pin 52 is inserted into hole 42c formed in support surface portion 42b.

[0020] Displacement absorbing member 55 is sandwiched and disposed between the upper surface of main body 51 and the lower surface of winding 20. Main body 51, pins 52, and displacement absorbing member 55 are formed from materials that exhibit good electrical insulation. For example, in this embodiment, main body 51 and pins 52 are integrally molded from a resin material such as epoxy resin. Displacement absorbing member 55 is made of an elastic member such as rubber, and is provided so as to be able to absorb relative displacement between support member 50 and winding 20 within a predetermined range by elastic deformation.

[0021] The main body 51 and the pin 52 are each formed in a cylindrical shape with an axial direction facing the up-down direction, and are provided on the same central axis (concentrically). The hole 42c is formed in a circular hole shape, and a central axis C2 is arranged in the up-down direction, which is the thickness direction of the support surface portion 42b. If the diameter of the main body 51 is D, the diameter of the pin 52 is d1, and the diameter of the hole 42c is d2, the dimensions are formed to be larger in the order of diameter d1, diameter d2, and diameter D (D>d2>d1). Therefore, the diameter d1 of the pin 52 is formed smaller than the diameter d2 of the hole 42c, and the pin 52 is inserted into the hole 42c via a gap S.

[0022] The hole 42c is formed penetrating the support surface portion 42b in the thickness direction, and the thickness of the support surface portion 42b is set to the depth T of the hole 42c. The length L of the pin 52 is formed to be longer than the depth T of the hole 42c.

[0023] Generally, the transformer 1 may be subjected to an external force due to an earthquake or the like. This may cause a displacement that cannot be absorbed by the displacement absorbing member 55, or vibrations in multiple directions. Even in such a case, it is required to prevent the support member 50 from falling off due to a large rotational displacement of the support member 50 and from being unable to be supported by the support member 50 and falling off due to the falling off of the support member 50. To meet such a requirement, in the present embodiment, the pin 52 and the hole 42c are configured as follows.

[0024] Fig. 4B is an explanatory enlarged view of the state in which the support member is rotationally displaced. When a force is applied in a direction in which the support member 50 is rotationally displaced so that it falls over as shown in Fig. 4B, the support member 50 is rotationally displaced with the outer edge of the lower surface of the main body 51 as the center C1. In this state, the pin 52 abuts against the formation area of ​​the hole 42c on both radial sides (both left and right sides in Fig. 4B) so as to sandwich the central axis C2. In other words, the pin 52 abuts against the formation area of ​​the hole 42c on both radial sides (both left and right sides in Fig. 4B).

[0025] More specifically, in the state of FIG. 4B, the pin 52 and the region where the hole 42c is formed are in contact with each other at two contact positions P1 and P2 in a generally point-like manner. The contact position P1 is a range between the outer edge of the lower surface of the main body 51, which is the center C1 of the rotational displacement, and the central axis C2 of the hole 42c, and is a region near the base end of the pin 52 and an upper opening edge of the hole 42c. The contact position P2 is a region near the tip of the pin 52 and an upper opening edge of the hole 42c in a range on the opposite side of the center C1 from the central axis C2 of the hole 42c. Therefore, in a state where the pin 52 is in contact with the contact positions P1 and P2, the tip side of the pin 52 protrudes from the lower opening edge of the hole 42c and the pin 52 penetrates the hole 42c. In other words, the length L of the pin 52 and the depth T of the hole 42c are set so as to achieve this state.

[0026] Thus, according to the first embodiment, even if a force acts on support member 50 in a direction causing rotational displacement about center C1 at the outer edge of the lower surface of main body 51, hole 42c can be brought into contact with pin 52 at two contact positions P1 and P2. This makes it possible to restrict the rotational displacement of support member 50 within a predetermined range, preventing support member 50 from falling over or falling off, and ultimately preventing support member 50 from falling off from between winding 20 and frame 40.

[0027] According to the first embodiment, when the pin 52 is inserted into the hole 42c, a gap S is formed therebetween, as shown in Fig. 4A. This improves the workability of inserting the pin 52 into the hole 42c, and also reduces the manufacturing burden by allowing for lower precision required for machining the hole 42c and the pin 52.

[0028] Next, other embodiments of the present invention will be described. In the following description, the same reference numerals may be used for the same or equivalent components as those in the first embodiment, and the description may be omitted or simplified.

[0029] [Second embodiment] A second embodiment of the present invention will be described with reference to Fig. 5. Fig. 5A and Fig. 5B are similar to Fig. 4A and Fig. 4B of the transformer according to the second embodiment. As shown in Fig. 5A, in the second embodiment, the length L of the pin 52 and the depth T of the hole 42c in the first embodiment are changed.

[0030] In the second embodiment, the length L of the pin 52 is shorter than the depth T of the hole 42c. In the second embodiment, when a force in a direction of rotational displacement is applied to the support member 50, the support member 50 is rotated and displaced around the outer edge of the lower surface of the main body 51 as the center C1, as shown in Fig. 5B. In this state, the formation area of ​​the hole 42c and the pin 52 abut at two abutment positions P3 and P4.

[0031] The contact position P3 is in the range between the outer edge of the lower surface of the main body 51, which is the center C1 of the rotational displacement, and the central axis C2 of the hole 42c, similarly to the contact position P1 in the first embodiment, and is an area near the base end of the pin 52 and an upper opening edge of the hole 42c. The contact position P4 is in the range on the opposite side of the center C1 from the central axis C2 of the hole 42c, and is the tip of the pin 52 and the inner circumferential surface of the hole 42c. In the second embodiment, when the pin 52 is in contact with the contact positions P3 and P4, the tip of the pin 52 does not protrude from the lower opening edge of the hole 42c and the pin 52 is contained within the hole 42c. In other words, the length L of the pin 52 and the depth T of the hole 42c are set so as to achieve this state.

[0032] Also in the second embodiment, the pin 52 abuts against the formation region of the hole 42c on both radial sides (both left and right sides in FIG. 5B) of the central axis C2 of the hole 42c, and both radial sides of the pin 52 (both left and right sides in FIG. 5B) abut against the formation region of the hole 42c. Thus, the hole 42c and the pin 52 abut at two abutment positions P3 and P4, and the rotational displacement of the support member 50 can be restricted within a predetermined range. This makes it possible to prevent the support member 50 from falling over or falling off, as in the first embodiment, and therefore to prevent the support member 50 from falling off between the winding 20 and the frame 40.

[0033] [Third embodiment] A third embodiment of the present invention will be described with reference to Fig. 6. Fig. 6A and Fig. 6B are similar to Fig. 4A and Fig. 4B of the transformer according to the third embodiment. As shown in Fig. 6A, in the third embodiment, the shape of the pin 52 in the first embodiment is changed.

[0034] In the third embodiment, the pin 52 is formed in a truncated cone shape with a tapered surface that gradually narrows toward the tip. In the third embodiment, when a force in a rotational displacement direction is applied to the support member 50, the support member 50 is rotated and displaced around the outer edge of the lower surface of the main body 51 as the center C1, as shown in Fig. 6B. In this state, the formation area of ​​the hole 42c and the pin 52 abut at two abutment positions P5 and P6.

[0035] Similar to the contact position P1 in the first embodiment, the contact position P5 is in the range between the outer edge of the lower surface of the main body 51, which is the center C1 of rotational displacement, and the central axis C2 of the hole 42c, and is a region near the base end of the pin 52 and an upper opening edge of the hole 42c. The contact position P6 is in the range on the opposite side of the center C1 from the central axis C2 of the hole 42c, and is the tip of the pin 52 and the lower opening edge of the hole 42c.

[0036] According to the third embodiment, the pin 52 abuts against the formation region on both radial sides (both left and right sides in FIG. 6B) of the hole 42c so as to sandwich the central axis C2, and both radial sides of the pin 52 abut against the formation region of the hole 42c. Thus, the hole 42c and the pin 52 abut at two abutment positions P5 and P6, and the rotational displacement of the support member 50 can be restricted within a predetermined range. As a result, as in the first embodiment, the support member 50 can be prevented from falling over and falling off, and the support member 50 can be prevented from falling off between the winding 20 and the frame 40. In addition, since the pin 52 becomes thinner toward the tip, when the support member 50 is integrally molded, a draft angle can be set for the pin 52 when it is removed from the mold, and the workability of inserting the pin 52 into the hole 42c can be improved.

[0037] [Fourth embodiment] A fourth embodiment of the present invention will be described with reference to Fig. 7. Fig. 7A and Fig. 7B are similar to Fig. 4A and Fig. 4B of the transformer according to the fourth embodiment. As shown in Fig. 7A, in the seventh embodiment, the shape of the pin 52 in the first embodiment is changed.

[0038] In the fourth embodiment, the pin 52 is formed in a truncated cone shape with a tapered surface that gradually becomes thicker toward the tip. In the fourth embodiment, when a force in a direction of rotational displacement is applied to the support member 50, the support member 50 is rotated and displaced around the outer edge of the lower surface of the main body 51 as the center C1, as shown in Fig. 7B. In this state, the formation area of ​​the hole 42c and the pin 52 abut at two abutment positions P7 and P8.

[0039] Like the contact position P1 in the first embodiment, the contact position P7 is in the range between the outer edge of the lower surface of the main body 51, which is the center C1 of rotational displacement, and the central axis C2 of the hole 42c, and is a region near the base end of the pin 52 and an upper opening edge of the hole 42c. The contact position P8 is in the range opposite the center C1 from the central axis C2 of the hole 42c, and is the tip of the pin 52 and the inner peripheral surface of the hole 42c.

[0040] According to the fourth embodiment, the pin 52 abuts against the formation region of the hole 42c on both radial sides (both left and right sides in FIG. 7B) of the hole 42c so as to sandwich the central axis C2, and both radial sides of the pin 52 (both left and right sides in FIG. 7B) abut against the formation region of the hole 42c. Thus, the hole 42c and the pin 52 abut at two abutment positions P7 and P8, and the rotational displacement of the support member 50 can be restricted within a predetermined range. As a result, as in the first embodiment, the support member 50 can be prevented from falling over or falling off, and the support member 50 can be prevented from falling off between the winding 20 and the frame 40.

[0041] The present invention is not limited to the above-mentioned embodiments, and can be modified in various ways. In the above-mentioned embodiments, the size and shape shown in the attached drawings are not limited to these, and can be modified as appropriate within the scope of the effects of the present invention. In addition, the present invention can be modified as appropriate without departing from the scope of the purpose of the present invention.

[0042] As long as the upper frame 41 and the lower frame 42 in the above embodiment have support surface portions 41b, 42b, they are not limited to the above shapes and structures, and may have another structure, for example, using L-shaped or U-shaped steel members.

[0043] Also, the support members 50 on the upper and lower sides of the winding 20 have the same structure, but may have different structures. Thus, as described above, the configuration in which the pin 52 abuts on the formation regions on both radial sides of the hole 42c so as to sandwich the central axis C2 need only be provided on at least one of the support members 50 on the upper and lower sides of the winding 20, rather than on both. However, since the support member 50 on the lower side of the winding 20 makes it easier for the winding 20 to fall off in the event of an unintentional fall, it is preferable to adopt the configurations of the above-mentioned embodiments.

[0044] Moreover, the shape of the main body 51 of the support member 50 is not limited to a cylindrical shape, and may be changed to any extending shape that extends in the vertical direction, such as a rectangular column shape. Furthermore, the position of the center C1 when the support member 50 is rotationally displaced is not limited to the illustrated example, and is changed appropriately depending on the direction of the external force applied to the support member 50 and the shape of the main body 51.

[0045] Furthermore, the pin 52 of the support member 50 is not limited to a cylindrical shape or a truncated cone shape, and may be changed to any protruding shape such as a rectangular column shape. Furthermore, the opening shape of the round hole 42c is not limited to a circular shape, and may be changed to a rectangular shape, a polygonal shape, or the like. Thus, the position where the pin 52 and the hole 42c abut is not limited to one point in the formation region on each side of the central axis C2 of the hole 42c, and may be two or more points or a line shape.

[0046] In addition, in the above-mentioned embodiments, the present invention has been described as being applied to a transformer, but it may also be applied to other power static devices and power conversion devices as long as the above-mentioned effects can be obtained. Furthermore, it may also be applied to cases where the transformer is a step-up transformer. [Explanation of symbols]

[0047] 1: Transformer 10: Iron core 20: Winding 40: Frame 41b: Support surface part 42b: Support surface part 42c: Hole 50: Support material 51: Main body 52: Pin C1: Center C2: Central axis S: Gap

Claims

1. Iron core and A winding arranged around the iron core and having an axial direction oriented in a vertical direction; a frame supporting the core and upper and lower parts of the winding; a support member provided on at least one of an upper surface side and a lower surface side of the winding and disposed between the winding and the frame, the frame includes a support surface portion that sandwiches the winding and the support member from above and below, and a hole is formed in the support surface portion; The support member includes a body disposed between the winding and the support surface; a pin protruding from a surface of the main body facing the support surface portion and inserted into the hole via a gap, A transformer characterized in that when the support member is rotationally displaced around the outer edge of the surface of the main body facing the support surface portion, the pin abuts against formation areas on both sides of the central axis of the hole.

2. The pin is formed in a cylindrical shape, The transformer as described in claim 1, characterized in that when the support member is rotationally displaced around the outer edge of the surface of the main body facing the support surface portion, it abuts against the hole formation area on both radial sides of the pin.

3. The pin is formed in a truncated cone shape having a tapered surface that narrows toward the tip, The transformer as described in claim 1, characterized in that when the support member is rotationally displaced around the outer edge of the surface of the main body facing the support surface portion, it abuts against the hole formation area on both radial sides of the pin.

4. The hole is formed through the support surface portion in a thickness direction, A transformer as claimed in any one of claims 1 to 3, characterized in that the pin passes through the hole when the support member is rotationally displaced around the outer edge of the surface of the main body that faces the support surface portion.

5. 4. The transformer according to claim 1, wherein the winding is formed by coating a cylindrical winding body made of a wound conductor with a resin.

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