JP2009148044A - Spacer for power transmission line - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spacer for a power transmission line which is improved in durability by dramatically improving the friction resistance performance of a movable part. <P>SOLUTION: The spacer for the power transmission line is constituted in such a manner that a plurality of clamps 3 each having a holding part 1 for folding a conductor, and a crevice 2 formed into a U-shape at its cross section are supported to a bearing 5 of a frame 4 via an shaft-shaped connecting member 6 having a flange 7 at its middle part at prescribed intervals. Fluorocarbon resin sheets T1, T2 and T3 are interposed in at least either of clearances between the crevice 2 of the clamp 3 and one end of the connecting member 6 inserted into the crevice 2, or between the flange 7 of the connecting member 6 which is fit to and engaged with the bearing 5 of the frame 4 and the bearing 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a power transmission line spacer for supporting each conductor of a multiconductor power transmission line at a predetermined interval.

  In an ultrahigh voltage and large capacity overhead power transmission line, the number of conductors per phase is constituted by a plurality of multiconductor power transmission lines. In order to keep the electrical and mechanical characteristics of such a multiconductor transmission line stable, a transmission line spacer is used that maintains a constant spacing between the conductors. For example, as shown in FIG. 4, the transmission line spacer includes a holding portion 1 that holds a conductor (not shown) in a sandwiched state, and a clevis portion 2 that is formed in a substantially U shape and has a gap. A plurality of clamps 3 are configured to be supported at respective vertices of a frame 4 formed in a rectangular frame shape with a predetermined interval (see, for example, Patent Document 1).

  In such a transmission line spacer, not only simple axial loads are repeated, but also subspan vibration, light wind vibration, and accompanying tension fluctuations of each conductor act simultaneously, and various variations such as the line direction and the direction perpendicular to the line Load elements repeatedly act. Due to the action of such a complicated load, in the initial state, the gap increases due to fretting wear (fretting wear), and play occurs. Once rattling occurs, the impact is repeatedly applied and progresses to fatigue failure. If the wear of the connecting part increases, the wear will increase rapidly, causing troubles such as damage to the nut or cotter pin, damage to the clamp body, dropping of the clamp from the frame, or damage to the conductor. Will occur.

For this reason, wear countermeasures are applied to the transmission line spacer. In the above conventional example, a spring 8 is provided for elastically urging and slidingly contacting the flange portion 7 of the connecting member (I metal fitting) 6 for connecting the clamp 3 to the bearing portion 5 of the frame 4 to the bearing portion 5. ing. Further, one end of the connecting member 6 inserted into the gap of the clevis portion 2 is urged against the inner wall surface of the clevis portion 2 by a spring 10 wound around an I metal fitting pin 9 for fixing the one end. With such a configuration, the wear resistance of the movable part in the transmission line spacer can be improved. The conductor is sandwiched between the main body of the holding unit 1 and a lid member 11 that can be opened and closed. The lid member 11 is latched in a closed state by a pivotable latch member 12. The latching member 12 is supported by the lower end of the cylindrical member 13 that is urged upward by the elastic force of the return spring 14, and the vertical position of the cylindrical member 13 is adjusted by the holding bolt 15, thereby providing a conductor. The holding state of the lid member 11 with respect to can be adjusted.
JP 2005-198358 A

  In the above conventional example, even when the above-described wear countermeasures are taken, the wear resistance of the movable part cannot be sufficiently improved. In particular, since the clamp 3 is formed by casting an aluminum alloy, the hardness is relatively low, and the inner wall surface of the clevis portion 2 is worn by the steel connecting member 6 biased by the spring 10 as described above. Could not be effectively prevented. Further, even when the flange portion 7 of the connecting member (I metal fitting) 6 is elastically slidably contacted with the bearing portion 5 by the spring 8, the wear of the bearing portion 5 cannot be sufficiently prevented.

  This invention is made | formed in view of such a situation, and it aims at providing the spacer for power transmission lines which improved the abrasion resistance of a movable part markedly, and improved durability.

According to the present invention, a plurality of clamps including a holding portion for holding a conductor and a clevis portion having a U-shaped cross section are attached to a bearing portion of a frame via a shaft-like connecting member having a flange portion at an intermediate portion. Transmission line spacers that are supported at predetermined intervals,
Between the clevis part of the clamp and one end of the connecting member fitted into the clevis part, or between the flange part of the connecting member fitted into the bearing part of the frame and the bearing part A fluorine resin sheet is interposed between the two.

  According to such a configuration, in a state where the transmission line spacer is installed between the conductors of the multiconductor transmission line, it is formed between the clevis part that becomes a movable part and the connecting member, or in the intermediate part of the connecting member. A fluorine resin sheet having a low friction coefficient is interposed between at least one of the flange portion and the bearing portion of the frame. Therefore, even if various load elements repeatedly act on these movable parts, the frictional resistance in the movable parts is reduced. Thereby, wear of a movable part is reduced, progress to fatigue destruction is eased, and durability is improved. As such a fluorine resin sheet, for example, polytetrafluoroethylene (PTFE) is a suitable material.

  You may provide the elastic member for carrying out the urging | biasing contact of the one end side surface of the said connection member with the inner wall face of the said clevis part. In this way, when an external force is applied, it is possible to suppress the occurrence of rattling between one end side surface of the connecting member and the inner wall surface of the clevis portion. Wear is reduced.

  A fluororesin sheet may be interposed between the biasing end of the elastic member and the corresponding surface of the connecting member. In this way, since the frictional resistance between the biasing end of the elastic member and the corresponding surface of the connecting member is reduced, the wear of that portion is reduced when an external force is applied.

  According to the transmission line spacer of the present invention, at least one of the clevis portion and the connecting member, or between the flange portion formed in the intermediate portion of the connecting member and the bearing portion of the frame. Since a fluororesin sheet is interposed between them, even if various load elements repeatedly act on these movable parts, the frictional resistance in the movable parts is reduced, so that wear of the movable parts is reduced, leading to fatigue failure. Progresses, and durability is improved.

  Hereinafter, a power transmission line spacer according to an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an explanatory diagram of a configuration of a transmission line spacer. As shown in the figure, this power transmission line spacer has four clamps 3 each including a holding part 1 for holding a conductor (not shown) and a clevis part 2 having a U-shaped cross section, and a flange part 7 at an intermediate part. It is configured to be supported by a rectangular frame-like frame 4 (see FIG. 3) via a shaft-like connecting member 6 having a predetermined interval. The connecting member 6 is inserted and connected at one end into the gap of the clevis portion 2 and the other end is screwed and fixed to a bearing portion 5 provided at the four corners of the frame 4. Is biased toward the opposing inner wall surface of the clevis portion 2.

  In such a configuration, the three movable portions, that is, between the inner wall surface of the clevis portion 2 and one end side surface of the connecting member 6, the biasing end of the elastic member 10 and the corresponding surface of the connecting member 6, Fluorine-based resin sheets (for example, polytetrafluoroethylene) T1, T2, and T3 having a low friction coefficient are interposed between the flange portion 7 of the connecting member 6 and the bearing portion 5 provided on the frame 4, respectively. ing. As described above, since the fluororesin sheets T1, T2, and T3 are interposed at the three positions that become the movable part, even if various load elements repeatedly act on the movable part, the frictional resistance of the movable part. Therefore, the wear of the movable part is reduced, the progress to fatigue failure is mitigated, and the durability of the transmission line spacer is improved.

  More specifically, one end of the connecting member 6 inserted into the gap of the clevis portion 2 is penetrated by an I metal fitting pin 9 with a head portion 9a, and the I metal fitting pin 9 is connected to both side walls 21 and 22 of the clevis portion 2. The tip is fixed to the side wall 21 by a stop pin p. Thereby, one end of the connecting member 6 is fixed to the clevis portion 2 in a state of being rotatable around the I metal fitting pin 9. Then, as shown in an enlarged view in FIG. 2A, a state in which the fluororesin sheet T <b> 1 is fitted on the I metal fitting pin 9 between the inner wall surface 2 a of the clevis portion 2 and one end side surface 6 a of the connecting member 6. It is intervened in.

  On the other hand, the elastic member 10 made of a coil spring fitted on the pin shaft is locked to the head portion 9a of the I metal fitting pin 9 in a retaining state, as shown in an enlarged view in FIG. Between the urging end of the coil spring 10 and the corresponding surface 6b of the connecting member 6, a fluororesin sheet T2 integrated with a metal washer w by adhesion or the like is interposed. In such a configuration, both the fluororesin sheets T1 and T2 are moved between the inner wall surface 2a of the clevis portion 2 and the one end side surface 6a of the connecting member 6 and the coil spring 10 by the biasing force of the coil spring 10. The pressure is held between the biasing end and the corresponding surface 6 b of the connecting member 6. Therefore, in particular, fixing with an adhesive is unnecessary, but one fluorine-based resin sheet T1 may be bonded to the inner wall surface 2a of the clevis portion 2.

  And between the collar part 7 of the connection member 6 and the bearing part 5 provided in the flame | frame 4, as expanded and shown in FIG.2 (c), the fluororesin sheet | seat T3 is the axis | shaft of the connection member 6. As shown in FIG. It is inserted in a state of being fitted on the part. A hooked nut 16 screwed into a threaded portion formed at the tip of the connecting member 6 and a reduced diameter portion around the opening of the bearing portion 5 are fitted on the shaft portion of the connecting member 6. A coil spring 8 is stretched. Therefore, the fluorine-based resin sheet T3 is held in a state of being sandwiched between the flange portion 7 of the connecting member 6 and the bearing portion 5 of the frame 4. Also in this case, it is not particularly necessary to fix the fluororesin sheet T3 with an adhesive or the like, but it may be adhered to the bearing portion 5.

  As the fluororesin sheets T1, T2, T3, for example, those having a thickness of about 2.4 mm can be used. Its friction coefficient (both static friction coefficient and dynamic friction coefficient) is low, it is self-lubricating, it is maintenance-free, can be used for a long time, and can be applied to a wide temperature range. About the thickness, it can select suitably according to use conditions, the freedom degree of a design is high, and it can also adhere | attach strongly with a metal material. Therefore, as described above, it may be integrated with the washer, may be attached alone to the sliding surface of the movable part, or may be used while being held in a pinched state without being bonded. Since such fluororesin sheets T1, T2, and T3 can be procured at low cost, the power line spacer of the present invention can be provided at low cost.

  It should be noted that the present invention is not limited to the embodiment, and can be freely improved, changed, etc. as necessary without departing from the gist of the invention. For example, two fluororesin sheets may be used in a stacked manner. In this case, since self-lubricating properties are provided, the durability can be further improved. Further, as shown in the embodiment, the power transmission line spacer of the present invention does not have to be provided with the fluorine-based resin sheets T1, T2, and T3 at three locations. The clevis portion 2 of the clamp 3 and the clevis portion 2 Between one end of the connecting member 6 inserted into the bearing member 5 or between at least one of the flange portion 7 of the connecting member 6 inserted into the bearing portion 5 of the frame 4 and the bearing portion 5, What is necessary is just to interpose a fluorine resin sheet. Therefore, for example, between the clevis part 2 and one end of the connecting member 6 fitted in the clevis part 2, one of the fluorine-based resin sheets T1 and T2 may be omitted. Moreover, the fluorine resin sheet T3 interposed between the flange portion 7 of the connecting member 6 and the bearing portion 5 may be omitted.

  The power transmission line spacer of the present invention has high durability by interposing a fluororesin sheet having a low friction coefficient in the movable part, and therefore can be suitably applied to, for example, an ultrahigh voltage large capacity overhead power transmission line.

It is explanatory drawing of the principal part structure of the spacer for power transmission lines which concerns on embodiment of this invention. It is expansion explanatory drawing of each movable part in which the same fluorine-type resin sheet is interposed, (a) is between a clevis part and one end of a connection member, (b) is the energizing end of a resilient member, and the corresponding surface of a connection member (C) shows a state in which a fluororesin sheet is interposed between the flange portion of the connecting member and the bearing portion. It is explanatory drawing of the whole spacer for power transmission lines. It is explanatory drawing of the principal part structure of the conventional spacer for power transmission lines.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Holding part 2 Clevis part 2a Inner wall surface 3 Clamp 4 Frame 5 Bearing part 6 Connection member 6a One end side surface 6b Corresponding surface 7 Grow part 8 Spring 9 I metal fitting pin 9a Head part 10 Spring 11 Lid member 12 Latching member 13 is cylindrical Member 14 Return spring 15 Presser bolt 16 Nuts with hooks 21 and 22 Side wall T1, T2, T3 Fluorine-based resin sheet w Washer p Stop pin

Claims (3)

A plurality of clamps each including a holding portion for holding a conductor and a clevis portion having a U-shaped cross section are arranged at predetermined intervals on a bearing portion of the frame via a shaft-like connecting member having a flange portion at an intermediate portion. A transmission line spacer that is supported by
Between the clevis part of the clamp and one end of the connecting member fitted into the clevis part, or between the flange part of the connecting member fitted into the bearing part of the frame and the bearing part A spacer for power transmission lines, characterized in that a fluorine resin sheet is interposed between the two. The transmission line spacer according to claim 1, wherein a resilient member is provided to urge and abut one end side surface of the connecting member against the inner wall surface of the clevis portion. The power transmission line spacer according to claim 2, wherein a fluorine-based resin sheet is interposed between a biasing end of the elastic member and a corresponding surface of the connecting member.

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