JP2006179206A - Bushing for electric equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To lessen probability of inducing earth fault accident by preventing water from staying in a flange part mounted with a snow protection cover, and by maintaining a part of a shade part of an insulating tube in a dry zone state. <P>SOLUTION: This device is provided with the insulating tube main body 3 having the shade part 4 integrated at the outer periphery, terminal fittings 5 mounted on the end part of the insulating tube main body 3, a snow protection cover 10 that is formed so as to cover a part of the shade part 4 and mounted on the terminal fittings 5, and a terminal cover 13 that is formed so as to cover the outer charging part and fitted to the snow protection cover 10, while in the snow protection cover 10, a rib 10e is installed at the periphery engaged with a side face of the flange part 5a of the terminal fittings 5 arranged outward from the hole part 10d, and at the upper end part of the rib 10e, hollow flange parts 10f are formed integrally so as to be opposed in the diameter direction and are partially engaged with the upper end face of the flange part 5a of the terminal fittings 5, and an aperture 10g is formed between the flange parts 10f, 10f. Furthermore, the lower end part of the rib 10e is protruded toward inner side than the bottom part 10a of the snow protection cover 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bushing for electrical equipment suitable for use in a snowfall area near a coast.

  In electrical equipment installed in snowy areas near the coast, if salt snow (snow containing salt in seawater) adheres to the outer surface of the terminal cover exposed to the outside air and the outer surface of the bushing main body, for example, wet high pressure Leakage current will flow continuously through the outer surface of the lead wire, the outer surface of the terminal cover, and the outer surface of the pipe body to the electrical equipment case, which is the ground potential section, and eventually a ground fault will occur. In order to prevent such a ground fault, a snow cover may be provided on the soot pipe.

  7 to 10 show a conventional bushing for an electric device provided with this type of snow cover. 1 is a porcelain tube made of porcelain. The porcelain tube 1 is arranged in a state where a rear end portion thereof penetrates a case 2 of an electric device and fixed to the case 2 of the electric device, and the porcelain tube main body 3 And a plurality of shade portions 4 formed integrally with each other. A center conductor (not shown) that is electrically connected to the inside of the electrical equipment is inserted into a conductor through hole (not shown) of the shaft core portion of the soot tube 1, and a terminal fitting 5 is screwed to the tip of the center conductor, so that the terminal The lower end surface of the flange portion 5a of the metal fitting 5 is attached to the upper end surface of the soot tube 1 via a packing (not shown). A connection terminal 7 to which a high-voltage outlet wire 6 made of an insulating coated electric wire is connected is fastened and fixed to a terminal plate 5 b of the terminal fitting 5 by a bolt 8 and a nut 9. A bottomed mortar-shaped snowproof cover 10 is adhered to the flange portion 5 a of the terminal fitting 5 with an adhesive 11 so as to cover a part of the shade portion 4 of the soot tube body 3 and not to contact the shade portion 4. . The bottom portion 10a of the snow cover 10 has a drain hole 12 that communicates with the outside, and the terminal fitting 5 and the connection terminal 7 are fastened and fixed to the outer peripheral surface of the upper end portion of the snow cover 10. In order to cover the charging part, the lower end part of the terminal cover 13 having elasticity is detachably fitted.

As a terminal cover that has elasticity and covers the external charging unit as described above, a terminal cover disclosed in Patent Document 1 is known.
Japanese Utility Model Publication No. 1-32651

  However, in the conventional bushing for electric equipment provided with this type of snow cover 10, it is considered to maintain watertightness between the upper end portion of the terminal cover 13 and the high voltage outlet wire 6. Since the load stress of the lead wire 6 is particularly applied to the vicinity of the upper end portion of the terminal cover 13, a gap is generated between the upper end portion of the terminal cover 13 and the high pressure lead wire 6 due to the influence of strong winds, etc. When salt water containing salt in seawater enters the terminal cover 13 during snowing or raining from the gap, the concave portion corresponding to the thickness of the snow cover 10 is formed in the flange portion 5a of the terminal fitting 5. 14 is formed, there is a problem that salt water accumulates in the recess 14 and the terminal fitting 5 is corroded due to use over time.

  Further, when salt water enters the terminal cover 13 through the high-voltage outlet wire 6, the salt water that has entered the drainage hole 12 passes through the drain hole 12 as shown by the broken line arrow A in FIG. After reaching the flange portion 5a through the inner side, it falls on the shade portion 4 and wets the dry zone B of the shade portion 4, which may cause a ground fault.

  Further, when the snow cover 10 is attached to the bushing of an existing electric device, the snow cover 10 is mounted on the upper end surface of the flange portion 5a of the terminal fitting 5 and is not restrained at all. The snow cover 10 may move due to external factors such as strong winds, and the bonding portion may be displaced, and the positional relationship between the snow cover 10 and the cap portion may not be maintained well. Since it was necessary to take some holding means so that the snow cover 10 did not move until the adhesive was cured, there was a problem that workability on site was poor.

  An object of the present invention is to prevent salt water from accumulating in the flange portion of the terminal fitting to which the snow cover is attached, and to maintain a part of the shade portion of the soot pipe in the dry zone, which may cause a ground fault. It is an object of the present invention to provide a bushing for an electric device that can reduce the amount of the electric device.

  A further object of the present invention is to provide a bushing for an electric device in which a snowproof cover can be easily attached to a bushing of an existing electric device.

  A soot tube main body having a conductor through hole in the shaft core portion, a cap portion integrally formed in the outer peripheral portion, and arranged in a state where the rear end side penetrates the case of the electrical device, and the conductor through hole of the soot tube body A central conductor provided in a state of passing through the terminal, a terminal fitting provided at an end of the central conductor, a high-voltage outlet wire made of an insulation-coated electric wire, and the terminal in a state where the high-voltage outlet wire is connected A part of the cap portion of the soot tube main body having a connection terminal fastened to the metal fitting, a hole through which the terminal metal fitting is inserted at the center, and a drain hole communicating with the outside at the bottom. And a bottomed mortar-shaped snow cover that is bonded to the flange portion of the terminal fitting so as not to contact the cap portion, and a charging portion where the terminal fitting and the connection terminal are fastened and fixed The lower end is removably fitted on the outer peripheral surface of the upper end of the snow cover. Target bushing for an electric apparatus including a cylindrical terminal cover that is.

  According to a first aspect of the present invention, a rib that engages with a side surface of the flange portion of the terminal metal fitting is provided from the hole portion of the snow cover to the outside, and a flange portion of the terminal metal fitting is provided at an upper end portion of the rib. A bushing for an electric device, characterized in that a hollow collar part partially engaged with an upper end surface is integrally formed in a state of being opposed in a radial direction.

  A second invention is a bushing for an electric device, wherein the snow cover described in the first invention has rubber elasticity.

  According to a third aspect of the present invention, there is provided a bushing for an electric device, wherein the lower end of the rib of the snow cover described in the first or second aspect protrudes inward from the bottom of the snow cover.

  According to a fourth aspect of the present invention, a plurality of engagements are provided at predetermined intervals in the circumferential direction on the inner wall portion of the rib protruding inward from the bottom portion of the snow cover according to any one of the first to third aspects. A bushing for an electric device, characterized in that a stop protrusion protrudes in the radial direction of the snow cover.

  According to a fifth aspect of the present invention, the height of the rib located at the opening between the flanges according to any one of the first to fourth aspects is set lower than the upper end surface of the flange portion of the terminal fitting. It is the bushing for electrical devices characterized by having it.

  According to the first aspect of the invention, the rib that engages the side surface of the flange portion of the terminal fitting is provided from the hole portion of the snow cover to the outside, and the terminal fitting of the terminal fitting is provided at the upper end portion of the rib. A hollow flange part that is partially engaged with the upper end surface of the flange part is integrally formed in a state of being opposed to each other in the radial direction, so that an opening is generated between the flange parts, and a snow-proof part is formed on the flange part of the terminal fitting. Since there is no recess for the thickness of the cover, even if salt water enters the flange of the terminal fitting through the high-voltage outlet wire, it flows down on the snow cover from the opening between the flanges and drains the snow cover. It is immediately discharged from the hole to the outside, and salt water is not stored in the flange portion of the terminal fitting, and corrosion of the terminal fitting can be prevented. In addition, the snow cover can be attached so that the rib of the snow cover is attached to the side of the flange of the terminal fitting and the flange is partially attached to the upper end of the flange of the terminal fitting so as to wrap the flange. The stability and stability of the snow cover can be constrained in a stable state, and the snow cover does not move due to external factors such as strong winds. It can be easily attached to the bushing of existing electrical equipment without dropping the electrical equipment in the mounted pole from the utility pole, improving workability on site and the positional relationship between the snow cover and the cap Can be kept good.

  Furthermore, according to the second aspect of the invention, in addition to the above effects, the snow cover has rubber elasticity, so that the snow cover can be firmly attached to the flange portion of the terminal fitting, and the snow cover is Even when it is blown by a strong wind, the snow cover can be temporarily and freely deformed to relieve the wind pressure on the snow cover, and the mounting state can be maintained stably for a long time even in severe weather conditions such as the coast.

  According to the third aspect of the invention, in addition to the above effects, the lower end of the rib of the snow protection cover protrudes inward from the bottom of the snow protection cover, so that it enters the terminal cover through the high-voltage outlet line. In order to prevent salt water that has traveled through the drain hole from the inside of the bottom of the snow cover to reach the upper part of the dry zone of the shade (see broken line arrow A in FIG. 4), The state of the dry zone can be maintained, and the probability of inducing a ground fault can be reduced.

  According to the fourth aspect of the invention, in addition to the above-described effect, the plurality of locking projections are provided at the inner wall portion of the rib protruding inward from the bottom portion of the snow-proof cover with a predetermined interval in the circumferential direction. Since the cover is projecting in the radial direction, the locking projection is engaged with the lower end of the flange of the terminal fitting when the snow cover is attached, and the adhesion and stability when the snow cover is attached are further improved. It can restrain in a more stable state, and the workability at the time of adhesive application improves more.

  Furthermore, according to the fifth aspect of the invention, in addition to the above effects, the height of the rib located at the opening between the flange portions of the snow cover is set lower than the upper end surface of the flange portion of the terminal fitting. Therefore, the adhesive part between the snow cover and the flange part of the terminal fitting can always be positioned below the upper end surface of the flange part, and no adhesive is attached to the upper end surface of the flange part, so that The problem of blocking the intruding salt water can be solved, and the salt water entering the terminal cover can be reliably discharged to the outside.

  1 to 4 show a bushing for an electric device according to an embodiment of the present invention, and FIGS. 5 and 6 show a snowproof cover according to the embodiment of the present invention, which corresponds to FIGS. 7 to 10 described above. The same reference numerals are given to the parts to be applied.

  1 is a porcelain tube made of porcelain. The porcelain tube 1 is arranged in a state where a rear end portion thereof penetrates a case 2 of an electric device and fixed to the case 2 of the electric device, and the porcelain tube main body 3 And a plurality of shade portions 4 formed integrally with each other.

  An unillustrated center conductor that is electrically connected to the inside of the electrical device is inserted into an unillustrated conductor through hole in the shaft core portion of the soot tube 1, and a not-illustrated screw portion that is screwed into the tip of the center conductor. A terminal fitting 5 is screwed, and the lower end surface of the flange portion 5a of the terminal fitting 5 is attached to the upper end surface of the soot tube 1 via a packing (not shown). A connection terminal 7 to which a high-voltage outlet wire 6 made of an insulating coated electric wire is connected is fastened and fixed to a terminal plate 5 b of the terminal fitting 5 by a bolt 8 and a nut 9.

  Reference numeral 10 denotes a snow cover, and the snow cover 10 is made of a soft and elastic insulating material such as silicon rubber or ethylene propylene rubber, and extends so as to cover the bottom portion 10a and a portion of the cap portion 4 of the tub tube body 3. The entire taper portion 10 b is formed in a mortar shape, and the outer peripheral edge 10 c is set to a diameter larger than the outer diameter of the cap portion 4.

  In the bottom portion 10a, a plurality of drain holes 12 communicating with the outside are provided at predetermined intervals in the circumferential direction in order to discharge salt water that has entered the terminal cover 13 through the high-pressure outlet line. A hole 10d through which the terminal fitting 5 is inserted is formed at the center of the bottom 10a.

  The snow cover 10 is provided with a rib 10e that is engaged with a side surface of the flange portion 5a of the terminal fitting 5 from the hole 10d toward the outside, and the terminal fitting 5 is provided at an upper end portion of the rib 10e. The hollow flange portion 10f that partially engages with the upper end surface of the flange portion 5a is integrally formed in a state of being opposed in the radial direction, whereby an opening portion 10g is generated between the flange portions 10f and 10f. .

  As described above, the rib that engages with the side surface of the flange portion of the terminal metal fitting is provided from the hole portion of the snow cover to the outside, and the upper end surface of the flange portion of the terminal metal fitting is provided at the upper end portion of the rib. Are formed in a state of being opposed to each other in the radial direction, an opening is generated between the flanges, and a recess corresponding to the thickness of the snow cover is formed on the flange portion of the terminal fitting. Since salt water does not exist, even if salt water enters the flange part of the terminal fitting through the high-voltage outlet wire, it flows down from the opening between the opposite flanges onto the snow cover, and is immediately discharged to the outside through the drain hole of the snow cover. Thus, salt water is not stored in the flange portion of the terminal fitting, and corrosion of the terminal fitting can be prevented. In addition, the snow cover can be attached so that the rib of the snow cover is attached to the side of the flange of the terminal fitting and the flange is partially attached to the upper end of the flange of the terminal fitting so as to wrap the flange. The stability and stability of the snow cover can be constrained in a stable state, and the snow cover does not move due to external factors such as strong winds. It can be easily attached to the bushing of existing electrical equipment without dropping the electrical equipment in the mounted pole from the utility pole, improving workability on site and the positional relationship between the snow cover and the cap Can be kept good.

  The lower end portion of the rib 10e protrudes inward from the bottom portion 10a of the snow cover 10, and a plurality of arc-shaped locking projections 10h are provided at predetermined intervals in the circumferential direction on the inner wall portion of the protruding rib 10e. The snow cover 10 protrudes in the radial direction.

  As described above, by projecting the lower end of the rib of the snow cover inward from the bottom of the snow cover, it penetrates into the terminal cover through the high pressure outlet wire, passes through the drain hole, Prevents salt water that has traveled from the inside of the bottom from reaching the upper part of the dry zone of the shade and can maintain a predetermined portion of the shade in the dry zone, reducing the probability of causing a ground fault. can do. In addition, by providing a plurality of locking projections projecting in the radial direction of the snow cover at predetermined intervals in the circumferential direction on the inner wall portion of the rib projecting inward from the bottom of the snow cover, the snow cover is provided. When the terminal bracket is inserted from above, the snow cover is easily elastically deformed due to the rubber elasticity, and the locking projection easily gets over the flange portion of the terminal bracket and is engaged with the lower end surface of the flange portion. The movement of the snow cover is restrained in a more stable state.

  The snow cover 10 is inserted into the hole 10d from above the terminal fitting 5 to cover the uppermost shade portion 4 of the soot tube body 3, and the flange portion of the terminal fitting 5 so as not to contact the shade portion 4. 5a is engaged with the rib 10e and the flange portion 10f, and the outer peripheral edge of the opening 10g between the opposite flange portions 10f, 10f of the snow cover 10 so that salt water does not enter the snow cover 10. The adhesive 11 is applied over the entire periphery of the edge and is water-tightly bonded to the outer surface of the flange portion 5a.

  A terminal cover 13 is formed in a conical shape. An electric shock caused by a person coming into contact with an external charging unit to which the terminal fitting 5 and the connection terminal 7 are fastened and fixed, or a ground caused by contact of birds and beasts. In order to prevent an entanglement accident, it has rubber elasticity made of the same material as that of the snow cover 10, and the inner peripheral surface of the lower end is detachably fitted to the outer peripheral surface of the upper end of the snow cover 10. ing.

It is a partial longitudinal cross-sectional view of the bushing for electrical devices which showed embodiment of this invention. It is a principal part perspective view of the bushing for electric devices which showed embodiment of this invention. FIG. 3 is a partial longitudinal sectional view of FIG. 2. FIG. 4 is a plan view of FIG. 3. It is a longitudinal cross-sectional view of the snowproof cover in embodiment of this invention. FIG. 6 is a plan view of FIG. 5. It is a partial longitudinal cross-sectional view of the bushing for electric equipment provided with the conventional snowproof cover. It is a principal part perspective view of the bushing for electric devices provided with the conventional snow cover. It is a fragmentary longitudinal cross-sectional view of FIG. FIG. 10 is a plan view of FIG. 9.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fence pipe 2 Case of electric equipment 3 Fence pipe main body 4 Cap part 5 Terminal metal fitting 5a Flange part 10 Snowproof cover 10a Bottom part 10b Tapered part 10c Outer peripheral edge 10d Hole part 10e Rib 10f Girder part 10g Opening part 10h Locking protrusion 11 Adhesive 12 Water Hole 13 Terminal cover 14 Recess

Claims (5)

A soot tube main body having a conductor through hole in the shaft core portion, a cap portion integrally formed in the outer peripheral portion, and arranged in a state where the rear end side penetrates the case of the electrical device, and the conductor through hole of the soot tube body A central conductor provided in a state of passing through the terminal, a terminal fitting provided at an end of the central conductor, a high-voltage outlet wire made of an insulation-coated electric wire, and the terminal in a state where the high-voltage outlet wire is connected A connecting terminal fixed to the metal fitting, and a hole portion through which the terminal metal fitting is inserted at the center of the bottom portion, and a drain hole that communicates with the outside on the outer peripheral side of the hole portion. A bottomed mortar-shaped snow cover covered with a flange portion of the terminal fitting so as not to contact the shade portion, and the terminal fitting and the connection terminal are fastened and fixed. The lower end is provided to cover the external charging part that is being In electrical apparatus bushing with a freely fitted a cylindrical terminal cover attached to and detached from the peripheral surface,
A rib that engages with a side surface of the flange portion of the terminal metal fitting is provided from the hole portion of the snow cover to the outside and is partially provided on the upper end surface of the flange portion of the terminal metal fitting at the upper end portion of the rib. A bushing for an electric device, wherein the engaging hollow collars are integrally formed in a state of being opposed in the radial direction.   The bushing for an electric device according to claim 1, wherein the snow cover has rubber elasticity.   The bushing for an electric device according to claim 1 or 2, wherein a lower end of the rib of the snow protection cover projects inward from a bottom of the snow protection cover.   A plurality of locking projections projecting in a radial direction of the snow cover are provided at predetermined intervals in the circumferential direction on the inner wall portion of the rib projecting inward from the bottom of the snow cover. The bushing for electrical devices according to any one of claims 1 to 3. The height of the rib located in the opening part between the said collar parts is set lower than the upper end surface of the flange part of the said terminal metal fitting, The any one of Claims 1 thru | or 4 characterized by the above-mentioned. Bushing for electrical equipment.

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