JP5561529B2 - Loose spacer mounting structure and loose spacer suitable for the same - Google Patents

Description

  The present invention relates to a loose spacer mounting structure for a multiconductor transmission line or a multiconductor transmission line, and a loose spacer suitable for the structure.

  In order to prevent galloping of a multi-conductor transmission line or a multi-conductor transmission line, it is effective to use a loose spacer. The loose spacer has a plurality of conductor gripping portions as in the case of a normal spacer, but some of the conductor gripping portions are loose gripping portions for gripping the conductor in a rotatable manner, and other conductor gripping portions. Is a fixed holding portion that holds the conductor in a non-rotatable manner (see Patent Documents 1 to 3).

  4 and 5 show an example of a conventional loose spacer. In the figure, 1 is a plurality of conductors constituting a multi-conductor power transmission line, 3 is a frame serving as a base for maintaining a conductor interval, 5 is a loose gripping part that is attached to the frame 3 and grips the conductor 1 in a rotatable manner, 7 Is a fixed gripping part that is attached to the frame 1 and grips the conductor 1 in a non-rotatable manner. The fixed grip portion 7 is configured by a boltless clamp (a clamp that is tightened by a repulsive force of a coil spring compressed by a cam) used for a normal spacer.

  The loose gripping portion 5 is composed of a conductor gripping bracket 9 that holds the conductor 1 in a fixed manner and a support bracket 11 that supports the conductor gripping bracket 9 so that it can rotate with the conductor 1 within a predetermined range.

  The conductor gripping metal fitting 9 is a split type in which the conductor 1 is gripped by two conductor gripping pieces 9a and 9b. The two conductor gripping pieces 9a and 9b are hinge-coupled by a hinge pin 13 on one side of the conductor 1, and the opposite side is fastened by a fastening member 15 so as to fix and hold the conductor 1. The tightening member 15 is a boltless type that is tightened by a repulsive force of a coil spring compressed by a cam. In addition, the conductor gripping metal 9 integrally has a split-type cylindrical portion 17 a and 17 b that penetrates the inside of the support metal 11 along the conductor 1. The cylindrical portion 17a is formed integrally with the conductor holding piece 9a, and the cylindrical portion 17b is formed integrally with the conductor holding piece 9b.

  The support metal fitting 11 is composed of a split-type loose gripping piece 11a, 11b that grips the cylindrical portions 17a, 17b of the conductor gripping metal fitting 9 in a rotatable manner. The two loose gripping pieces 11a and 11b are hinged by a hinge pin 19 on one side of the cylindrical portions 17a and 17b, and are clamped on the opposite side by a fastening member 21 so that the cylindrical portions 17a and 17b can be rotated (loosely). It is like that. This fastening member 21 is also a boltless type that is fastened by the repulsive force of the compression coil spring. The base portion of one loose gripping piece 11 a is connected to a connection fitting 23 attached to the frame 3 via a bolt nut 25.

  Note that a flange portion 27 is formed on the cylindrical portions 17a and 17b of the conductor gripping metal 9 in order to prevent the support metal fitting 11 from moving in the conductor direction.

  Further, as shown in FIG. 5B, a convex portion 29 is formed at the central portion of the outer peripheral surface of one cylindrical portion 17a, and a groove portion into which the convex portion 29 enters the inner peripheral surface of one loose gripping piece 11a. 31 is formed in the circumferential direction (the convex portion 29 and the groove portion 31 may be formed also on the other cylindrical portion 17b and the other loose gripping piece 11b). The convex portion 29 and the walls 31 a and 31 b at both ends in the circumferential direction of the groove portion 31 constitute a stopper that restricts the rotation range of the conductor holding metal fitting 9. That is, from the state of FIGS. 5 (A) and 5 (B) (the state in which the conductor gripping bracket 9 is at an intermediate position at which both sides can be rotated by the same angle), the conductor gripping bracket 9 is rotated clockwise, When the convex portion 29 abuts against the wall 31a on one end side of the groove portion 31 as shown in FIG. 5 (C), it cannot be rotated any more, and the conductor holding metal fitting 9 is turned counterclockwise from the state of FIG. 5 (B). When the convex portion 29 is rotated and abuts against the wall 31b on the other end side of the groove portion 31 as shown in FIG. 5D, it cannot be rotated any further. The rotation range of the conductor gripping metal 9 with respect to the support metal 11 is normally set to about ± 80 °.

  Since the loose gripping portion 5 is configured as described above, when the galloping occurs in the multiconductor transmission line, the loose gripping portion 5 allows the conductor 1 and the conductor gripping bracket 9 to reciprocate with respect to the support bracket 11, and the fixed gripping portion 7. It works to suppress galloping by interacting with.

  FIG. 7 shows another example of the loose gripping portion of the loose spacer. 7, parts corresponding to those in FIGS. 4 and 5 are denoted by the same reference numerals as in FIGS. That is, 1 is a conductor, 3 is a frame, 5 is a loose gripping part, 9 is a conductor gripping bracket, 9a and 9b are conductor gripping pieces, 11 is a support bracket, 13 is a hinge pin, 15 is a fastening member, and 17a and 17b are split cylinders. A member, 23 is a connecting metal fitting, and 25 is a connecting bolt and nut.

  The loose gripping portion 5 fixes and grips the conductor 1 by tightening the conductor gripping bracket 9 with the cylindrical members 17a and 17b on the inner side by two fastening members 15 at both ends in the axial direction, and the intermediate portion in the axial direction. The support bracket 11 is rotatably supported. The tightening member 15 of the loose grip 5 is an eyebolt.

  In order to rotatably support the conductor gripping bracket 9, a guide plate 33 having an arc cross section formed integrally with the curvature of the outer peripheral surface of the cylindrical members 17a and 17b is integrally formed at the tip of the support bracket 11. Has been. In addition, a wide groove 35 for accommodating the guide plate 33 is formed in the circumferential direction on the inner peripheral surface of the conductor gripping fitting 9. Further, a slot 39 is formed in the circumferential direction in the intermediate portion in the axial direction of the conductor gripping fitting 9 so as to penetrate the base end portion of the support fitting 11 and the connecting portion 37 of the guide plate 33. The circumferential length of the groove 35 is sufficiently longer than the circumferential length of the guide plate 33, and the circumferential length of the slot 39 is also set sufficiently longer than the width of the connecting portion 35 of the support fitting 11.

  Thereby, the conductor holding metal fitting 9 is guided by the guide plate 33 and can be rotated together with the conductor 1 in the arrow R direction or the arrow S direction of FIG. The rotation range of the conductor gripping metal 9 is such that the wall 35a on one end side in the circumferential direction of the groove portion 35 abuts against the side surface on one side of the guide plate 33, and the wall 35b on the other end side of the groove portion 35 is opposite to the guide plate 33. (Or until the wall 39a on one end side in the circumferential direction of the slot 39 hits the connecting portion 37 of the support fitting 11 and the wall 39a on the other end side of the slot 39 connects to the connecting portion of the support fitting 11). Or until it hits 37).

  Even if the loose grip 5 has the above-described structure, it is possible to suppress galloping of the multi-conductor power transmission line as in the case of the loose spacer shown in FIGS.

JP-A-2-254916 Japanese Patent Laid-Open No. 10-322866 JP-A-8-9544

  As shown in FIGS. 4 (A) and 7 (B), the loose gripping portion 5 of the conventional loose spacer has a dividing surface P of the conductor gripping bracket 9 that is connected to the central axis of the frame 3 and the conductor gripping bracket 9 (conductor). It is attached to the conductor 1 so as to coincide with a plane Q passing through the central axis (of the gripping portion). In order to make such an attachment structure, the split surface P of the conductor gripping metal 9 in FIG. 4A is provided on the outer surfaces of the conductor gripping metal 9 and the support metal 11 as shown in FIG. Marks 41a and 41b are attached so as to be in the same position when they coincide with the plane Q passing through the central axis of the conductor gripping fitting 9 and the plane Q passing through the central axis of the conductor gripping fitting 9 (the same applies to FIG. 7).

  On the other hand, the fastening member 15 of the conductor gripping bracket 9 protrudes from the outer surface of the one conductor gripping piece 9a in a direction perpendicular to the dividing surface P of the conductor gripping bracket 9 to form a projection.

  As a result, when the conductor gripping bracket 9 is largely rotated in the protruding direction of the tightening member 15, the tightening member 15 moves outward from the spacer as shown in the lower right of FIG. It may protrude greatly (outside the circumscribed circle of the gripping part). Even in the loose gripping portion as shown in FIG. 7, when the conductor gripping bracket 9 is largely rotated in the protruding direction of the tightening member 15, it becomes a solid line in FIG. 8 and is in the same state as in FIG. 6. There is.

  If such a condition occurs temporarily when galloping occurs in the multiconductor transmission line, there is almost no problem. Recently, however, it has been confirmed that even when galloping has not occurred, the state in which the tightening member 15 protrudes outwardly from the spacer may continue without the twist generated in the conductor returning. In such a state, there is a problem that the fastening member 15 becomes a protrusion from the loose spacer and corona discharge occurs.

  In view of the above-described problems, the object of the present invention is to provide a loose spacer mounting structure that is less likely to cause corona discharge even when the loose gripping conductor twists and does not return to its original state, and is suitable for it. It is to provide a simple loose spacer.

The loose spacer mounting structure according to the present invention includes:
A frame serving as a base for holding a conductor interval, a loose gripping part that is attached to the frame and grips the conductor rotatably, and a fixed gripping part that grips the conductor non-rotatably,
The loose gripping part is composed of a conductor gripping bracket for fixing and gripping a conductor, and a support bracket for supporting the conductor gripping bracket so that it can rotate within a predetermined range together with the conductor.
The conductor gripping bracket is a split type in which a conductor is gripped by two conductor gripping pieces, and the two conductor gripping pieces are hinged on one side of the conductor, and the opposite side is clamped by a clamping member so that the conductor is fixedly gripped. And
To the multi-conductor transmission line or the multi-conductor transmission line of the loose spacer in which the tightening member of the conductor gripping fitting protrudes from the outer surface of one conductor gripping piece in a direction orthogonal to the split surface of the conductor gripping bracket and becomes a projection. The mounting structure of
Even if the conductor gripping bracket of the loose gripping portion is rotated to the limit of the rotation range in the protruding direction of the tightening member due to the twist of the conductor, the tightening member does not protrude outwardly from the circumscribed circle of the loose gripping portion and each fixed gripping portion. As described above, the conductor gripping bracket is in a state in which the split surface is inclined by a predetermined angle to the side opposite to the protruding direction of the tightening member with respect to a plane passing through the center axis of the frame and the center axis of the conductor gripping bracket. Thus, it is characterized by being attached to a conductor.

The loose spacer according to the present invention is
A frame serving as a base for holding a conductor interval, a loose gripping part that is attached to the frame and grips the conductor rotatably, and a fixed gripping part that grips the conductor non-rotatably,
The loose gripping part is composed of a conductor gripping bracket for fixing and gripping a conductor, and a support bracket for supporting the conductor gripping bracket so that it can rotate within a predetermined range together with the conductor.
The conductor gripping bracket is a split type in which a conductor is gripped by two conductor gripping pieces, and the two conductor gripping pieces are hinged on one side of the conductor, and the opposite side is clamped by a clamping member so that the conductor is fixedly gripped. And
In the loose spacer in which the tightening member of the conductor gripping fitting protrudes from the outer surface of one conductor gripping piece in a direction perpendicular to the divided surface of the conductor gripping fixture and becomes a projection,
The conductor gripping bracket has a state in which the split surface is inclined by a predetermined angle to the side opposite to the protruding direction of the fastening member with respect to a plane passing through the center axis of the frame and the center axis of the conductor gripping bracket. The stopper that restricts the rotation range of the conductor gripping bracket cannot be rotated any further when the conductor gripping bracket is rotated by an allowable angle from the intermediate position to the protruding direction of the tightening member, and the protruding direction of the tightening member The stopper is pivoted until the conductor gripping bracket cannot be rotated in the protruding direction of the tightening member due to the twisting of the conductor. Even so, the tightening member is formed so as not to protrude outward from the circumscribed circle of the loose gripping portion and the fixed gripping portions .

  Further, the loose spacer according to the present invention has a protruding direction of the tightening member with respect to a plane passing through the center axis of the frame and the center axis of the conductor gripping bracket on the outer surface of the conductor gripping bracket and the support bracket. It is preferable that the mark is attached so as to be in the same position when it is inclined by a predetermined angle to the opposite side.

  The loose spacer mounting structure according to the present invention includes a loose gripping portion for a conductor gripping bracket when the loose spacer is mounted on a multi-conductor transmission line or a multi-conductor transmission line, and a split surface of which is a central axis of the frame and a conductor gripping bracket. Since the conductor is attached to the conductor so as to be inclined at a predetermined angle to the side opposite to the direction in which the fastening member protrudes with respect to the plane passing through the central axis of the conductor, the conductor gripping bracket is attached in the direction in which the fastening member protrudes by twisting the conductor. Even if it is rotated to the limit, it can be avoided that the tightening member protrudes outward from the spacer. Therefore, even if the conductor remains twisted, the generation of corona discharge can be suppressed.

  In the loose spacer according to the present invention, the state in which the dividing surface of the conductor gripping bracket is inclined toward the side opposite to the protruding direction of the tightening member with respect to the plane passing through the center axis of the frame and the center axis of the conductor gripping bracket. Since it is in the middle position of the bracket rotation range, even if the conductor remains twisted, the corona discharge can be suppressed for the same reason as described above, and the conductor gripping bracket can be moved to either side from the middle position. Since it can be rotated by substantially the same angle, it can follow the reciprocal rotation of the conductor at the time of occurrence of galloping, and can sufficiently exhibit the galloping suppression effect.

  In addition, the loose spacer according to the present invention matches the conductor gripping bracket and the mark on the outer surface of the support bracket so that the conductor gripping bracket has a split surface whose center axis is the center axis of the frame and the conductor gripping bracket. Since it can be easily attached to the conductor so as to be inclined at a predetermined angle to the opposite side to the protruding direction of the tightening member with respect to the passing plane, the loose spacer can be attached efficiently.

An example of the attachment structure of the loose spacer concerning the present invention is shown, (A) is a front view and (B) is a BB line arrow directional view of (A). 1A shows a loose gripping portion of the loose spacer in FIG. 1, FIG. 1A is an enlarged view taken along the line B-B in FIG. 1A, FIG. 1B is a cross-sectional view along the line B-B in FIG. Sectional drawing which shows the state which the conductor holding metal fitting rotated to the limit from the state of (B) to the limit, (D) is sectional drawing which shows the state rotated to the limit to the opposite side similarly. The front view which shows one Example of the loose holding part of the loose spacer which concerns on this invention. An example of the attachment structure of the conventional loose spacer is shown, (A) is a front view, (B) is a BB line arrow directional view of (A). 4A shows a loose gripping portion of the loose spacer in FIG. 4, (A) is an enlarged view taken along line BB in FIG. 4 (A), (B) is a cross-sectional view along line BB in (A), (C) is Sectional drawing which shows the state which the conductor holding metal fitting rotated to the limit from the state of (B) to the limit, (D) is sectional drawing which shows the state rotated to the limit to the opposite side similarly. The front view which shows the problem of the attachment structure of the loose spacer of FIG. The other example of the loose grip part of the conventional loose spacer is shown, (A) is a plan view, (B) is a front view, (C) is a cross-sectional view along line CC of (B), and (D) is (A) D-D sectional view taken on the line of FIG. The front view which shows the problem of the attachment structure of the loose spacer of FIG.

  1 and 2 show an embodiment of the present invention. In FIG. 1 and FIG. 2, since the same code | symbol is attached | subjected to FIG.4 and FIG.5 demonstrated previously, the overlapping description is abbreviate | omitted.

  The feature of the loose spacer mounting structure is that the conductor gripping bracket 9 of the loose gripping portion 5 has its split surface P passing through the center axis of the frame 3 and the center axis of the conductor gripping bracket 9 (the center axis of the conductor gripping portion). It is attached to the conductor 1 so as to be inclined by a predetermined angle θ with respect to the plane Q toward the side opposite to the protruding direction of the fastening member 15.

  The angle θ is determined by the rotation range of the conductor gripping bracket 9, the protruding height of the fastening member 15 from the outer surface of the conductor gripping piece 9a, and the like. In the illustrated example, the state in which the dividing plane P is inclined by the angle θ is an intermediate position in the rotation range of the conductor gripping bracket 9, and the conductor gripping bracket 9 can be rotated within a range of ± 80 °, for example, from this intermediate position. If there is, θ should be set to about 25 °. Then, even when the conductor holding metal fitting 9 is rotated by 80 ° in the protruding direction of the tightening member 15, as shown by T in the lower right of FIG. No protrusion (outside the circumscribed circle of each gripping part). For this reason, even if this state continues due to the twist of the conductor 1, there is little possibility that corona will occur. Further, even when the conductor gripping bracket 9 is rotated by 80 ° in the direction opposite to the protruding direction of the tightening member 15, the outer surface of the conductor gripping piece 9b of the conductor gripping bracket 9 is indicated by U at the lower right in FIG. Does not protrude outward from the spacer. However, since the outer surface of the conductor gripping piece 9b of the conductor gripping bracket 9 is a smooth curved surface without protrusions, there is no problem of corona discharge even if it protrudes slightly to the outside of the spacer. Therefore, θ can be set to about 30 °.

  The stopper that restricts the rotation range of the conductor gripping bracket 9 includes the convex portion 29 formed on the outer peripheral surface of one cylindrical portion 17a and the convex portion formed in the circumferential direction on the inner peripheral surface of the loose gripping pieces 11a and 11b. It is comprised with the groove part 31 in which the part 29 enters. The projecting portion 29 and the groove portion 31 have a predetermined distance from the plane Q passing through the center axis of the frame 3 and the center axis of the conductor gripping bracket 9 to the side opposite to the protruding direction of the fastening member 15. The conductor gripping metal fitting 9 in the state inclined by the angle θ (the state shown in FIGS. 1A, 2A, and 2B) rotates by an allowable angle (for example, 80 °) in the protruding direction of the fastening member 15. Then, as shown in FIG. 2 (C), the convex portion 29 hits the wall 31a on one end side of the groove portion 31 and can no longer be rotated, and only an allowable angle (for example, 80 °) to the opposite side to the protruding direction of the tightening member 15. When rotated, the convex portion 29 is formed so as to abut against the wall 31b on the other end side of the groove portion 31 as shown in FIG. In this way, the conductor gripping bracket can be rotated from the intermediate position to either side by substantially the same angle, so that it can follow the reciprocating rotation of the conductor when galloping occurs, and the galloping suppression effect can be sufficiently exhibited.

  Further, on the outer surfaces of the conductor gripping bracket 9 and the support bracket 11, the split surface P of the conductor gripping bracket 9 protrudes from the plane Q passing through the center axis of the frame 3 and the center axis of the conductor gripping bracket 9. Marks 41a and 41b are attached so as to be in the same position when they are inclined by a predetermined angle to the opposite side of the direction. By attaching such marks 41a and 41b, the operator can easily tighten and fix the conductor gripping bracket to the conductor at an appropriate inclination angle.

  FIG. 3 shows another embodiment of the present invention. In this embodiment, the present invention is applied to a loose spacer having a loose gripping portion as shown in FIG. In FIG. 3, the same parts as those in FIG.

  In this loose spacer mounting structure, the conductor holding fitting 9 of the loose holding portion 5 is also protruded from the clamping member 15 with respect to a plane Q whose split surface P passes through the central axis of the frame 3 and the central axis of the conductor holding fitting 9. It is attached to the conductor 1 so as to be inclined by a predetermined angle θ toward the opposite side to the direction.

  In this way, the position of the clamping member 15 is as indicated by a two-dot chain line T even when the conductor gripping bracket 9 is rotated by, for example, 80 ° in the protruding direction of the clamping member 15 from the intermediate position (solid line position) of the rotation range. Thus, the height of the tightening member 15 protruding outward from the spacer can be made smaller than in the conventional example of FIG. 8, and corona discharge can be suppressed to that extent. Further, when the conductor gripping bracket 9 is rotated by, for example, 80 ° from the intermediate position of the rotation range to the side opposite to the protruding direction of the fastening member 15, the position of the conductor gripping piece 9b is as indicated by a two-dot chain line U. Since there is no possibility that the conductor gripping piece 9b protrudes outward from the spacer as a protrusion, there is no problem of corona discharge.

1: Conductor 3: Frame 5: Loose gripping part 7: Fixed gripping part 9: Conductor gripping metal fittings 9a, 9b: Conductor gripping piece 11: Support metal fittings 11a, 11b: Loose gripping piece 13: Hinge pin 15: Tightening members 17a, 17b: Cylindrical part 19: Hinge pin 21: Tightening member 23: Connecting metal fitting 25: Bolt nut 27: Gutter part 29: Convex part 31: Groove part 31a, 31b: Wall 33 at both ends of groove part 31: Guide plate 35: Groove part 35a, 35b: Groove part 35 at both ends 37: connecting portion 39: slots 39a, 39b: walls 41a, 41b at both ends of the slot 39: marks

Claims (3)

A frame serving as a base for holding a conductor interval, a loose gripping part that is attached to the frame and grips the conductor rotatably, and a fixed gripping part that grips the conductor non-rotatably,
The loose gripping part is composed of a conductor gripping bracket for fixing and gripping a conductor, and a support bracket for supporting the conductor gripping bracket so that it can rotate within a predetermined range together with the conductor.
The conductor gripping bracket is a split type in which a conductor is gripped by two conductor gripping pieces, and the two conductor gripping pieces are hinged on one side of the conductor, and the opposite side is clamped by a clamping member so that the conductor is fixedly gripped. And
To the multi-conductor transmission line or the multi-conductor transmission line of the loose spacer in which the tightening member of the conductor gripping fitting protrudes from the outer surface of one conductor gripping piece in a direction orthogonal to the split surface of the conductor gripping bracket and becomes a projection. The mounting structure of
Even if the conductor gripping bracket of the loose gripping portion is rotated to the limit of the rotation range in the protruding direction of the tightening member due to the twist of the conductor, the tightening member does not protrude outwardly from the circumscribed circle of the loose gripping portion and each fixed gripping portion. As described above, the conductor gripping bracket is in a state in which the split surface is inclined by a predetermined angle to the side opposite to the protruding direction of the tightening member with respect to a plane passing through the center axis of the frame and the center axis of the conductor gripping bracket. As described above, a loose spacer mounting structure characterized by being mounted on a conductor. A frame serving as a base for holding a conductor interval, a loose gripping part that is attached to the frame and grips the conductor rotatably, and a fixed gripping part that grips the conductor non-rotatably,
The loose gripping part is composed of a conductor gripping bracket for fixing and gripping a conductor, and a support bracket for supporting the conductor gripping bracket so that it can rotate within a predetermined range together with the conductor.
The conductor gripping bracket is a split type in which a conductor is gripped by two conductor gripping pieces, and the two conductor gripping pieces are hinged on one side of the conductor, and the opposite side is clamped by a clamping member so that the conductor is fixedly gripped. And
In the loose spacer in which the tightening member of the conductor gripping fitting protrudes from the outer surface of one conductor gripping piece in a direction perpendicular to the divided surface of the conductor gripping fixture and becomes a projection,
The conductor gripping bracket has a state in which the split surface is inclined by a predetermined angle to the side opposite to the protruding direction of the fastening member with respect to a plane passing through the center axis of the frame and the center axis of the conductor gripping bracket. The stopper that restricts the rotation range of the conductor gripping bracket cannot be rotated any further when the conductor gripping bracket is rotated by an allowable angle from the intermediate position to the protruding direction of the tightening member, and the protruding direction of the tightening member The stopper is pivoted until the conductor gripping bracket cannot be rotated in the protruding direction of the tightening member due to the twisting of the conductor. The loose spacer, wherein the tightening member is formed so as not to protrude outward from the circumscribed circle of the loose gripping portion and each fixed gripping portion .   On the outer surface of the conductor gripping bracket and the support bracket, the split surface of the conductor gripping bracket is inclined at a predetermined angle to the opposite side to the protruding direction of the fastening member with respect to the plane passing through the center axis of the frame and the center axis of the conductor gripping bracket. 3. The loose spacer according to claim 2, wherein a mark is attached so as to come to the same position when in a state.

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