JP4601791B2 - Resin bushing - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resin bushing attached to a device such as a transformer.
[0002]
[Prior art]
3 and 4 show the resin bushing previously proposed by the present applicant (Japanese Patent Application No. 11-118141). The resin bushing 1 projects below the umbrella cover resin portion 3 and a resin bushing main body 4 including a cylindrical core resin portion 2 and a rubber elastic umbrella cover resin portion 3 integrally provided so as to cover the surface thereof. The flange metal fitting 5 fixed to the outer periphery of the core resin portion 2 is integrated with the inner periphery of the flange metal fitting 5 so as to project integrally under the flange metal fitting 5 and The fixed cylindrical body 6 that covers the outer periphery and is provided with a locking projection 6a in an annular shape on the lower outer periphery, and a conductor rod 7 that is disposed through the cylindrical core resin portion 2 are configured. An attachment fitting 8 is constituted by the flange fitting 5 and the fixed cylinder 6. The flange metal fitting 5 and the fixed cylinder 6 are filled with an extension 3 a of the umbrella cover resin portion 3 in a gap between the inner circumference of the flange metal fitting 5 and the fixed cylinder 6 and the outer circumference of the core resin portion 2. The flange metal fitting 5 and the fixed cylinder 6 are fixed to the core resin portion 2 by an extension 3 a of the umbrella cover resin portion 3. Further, the upper surface and the outer peripheral surface of the flange metal fitting 5 are also integrally covered with the cover portion 3 b of the umbrella cover resin portion 3. The core resin portion 2 is made of epoxy resin FRP, unsaturated polyester FRP, epoxy resin, or the like. Moreover, the umbrella cover resin part 3 is comprised by the silicone rubber, ethylene propylene-type rubber, etc. which have a weather resistance and rubber elasticity. A primer adhesive is applied in advance to the portion of the core resin portion 2 covered with the umbrella cover resin portion 3 before the umbrella cover resin portion 3 is molded, and the core resin portion 2 and the umbrella cover resin portion 3 are chemically treated at the time of molding. Are to be combined. Umbrella portions 3c are projected from the outer periphery of the umbrella cover resin portion 3 at predetermined intervals in the longitudinal direction. The mounting bracket 8 composed of the flange bracket 5 and the fixed cylindrical body 6 is preferably made of stainless steel for rust prevention. However, since the cost is increased, the entire surface of the mounting bracket 8 is formed of an iron-based material for cost reduction. Plating (for example, galvanization, galvanization chromate treatment, etc.) is applied and covered with the plating layer M. A terminal fitting 9 is provided at one end of the conductor rod 7 to close one end of the core resin portion 2 and prevent the conductor rod 7 from coming off. The screw portion 7a at the other end of the conductor rod 7 passes through a fixture 10 that closes the other end of the core resin portion 2, and this fixture 10 is fixed by fastening a nut 11 screwed into the screw portion 7a. The fixture 10 is made of an insulator (for example, a bake plate).
[0003]
Next, a mounting structure for mounting the resin bushing 1 to a mounting seat 12 made of, for example, a transformer case will be described. The resin bushing 1 is arranged by placing the flange metal fitting 5 on the mounting seat plate 12 via the packing 14 in a state where the exposed portion of the core resin portion 2 and the fixed cylindrical body 6 are passed through the hole portion 13 of the mounting seat plate 12. Has been. The hole 13 of the mounting seat 12 is formed in such a size that the locking projection 6a of the fixed cylinder 6 can pass through. On the outer periphery of the fixed cylinder 6, an annular fixing fitting 16 is fitted with a hole 15. The hole 15 of the fixture 16 is also formed in a size that allows the locking projection 6a of the fixed cylinder 6 to pass therethrough. A coil spring 17 is fitted on the outer periphery of the fixed cylinder 6 and supported by the locking projection 6a so as not to fall. The fixing metal 16 is supported by the coil spring 17. That is, the outer diameter of the coil spring 17 is larger than the inner diameter of the hole 15 of the fixing bracket 16, so that the portion of the fixing bracket 16 on the outer peripheral side of the hole 15 is placed on the portion of the coil spring 17. Is supported. The tips of the fixing screws 19 screwed into the screw holes 18 of the fixing bracket 16 are brought into pressure contact with the lower surface of the mounting seat plate 12, and the fixing screws 19 are turned in such a state, whereby the fixing screws 19 are screwed into the screw holes. The fixing metal fitting 16 screwed at 18 is urged downward, and the urging force acts on the locking projection 6a of the fixed cylinder 6 via the coil spring 17, whereby the resin bushing 1 is pulled downward. The flange fitting 5 is pressed against the mounting seat plate 12 via the packing 14, and the resin bushing 1 is attached to the mounting seat plate 12 in an upright state.
[0004]
[Problems to be solved by the invention]
However, if the entire surface of the mounting bracket 8 composed of the flange bracket 5 and the fixed cylinder 6 is plated and covered with the plating layer M as described above, the plating layer M prevents activation of the surface of the mounting bracket 8. Since it has an effect, compared with an iron substrate, the adhesive force with the umbrella cover resin part 3 falls.
[0005]
Therefore, as shown in FIG. 4, the plating layer M is formed on the outer peripheral surface through the upper surface from the inner peripheral surface of the flange metal fitting 5, which is a portion in contact with the umbrella cover resin portion 3, and the inner peripheral surface of the fixed cylindrical body 6. In the mounting bracket 8 that is applied, the adhesive strength between the mounting bracket 8 and the umbrella cover resin portion 3 is lower than the adhesive strength between the iron base mounting bracket 8 and the umbrella cover resin portion 3, as described below. There is a problem.
[0006]
(A) When the adhesive strength between the fixed cylindrical body 6 of the mounting bracket 8 and the umbrella cover resin portion 3 is lowered, the resin bushing 1 is attached to the electrical equipment such as a transformer for transportation, or connected to the resin bushing 1. The mechanical strength of the resin bushing 1 decreases when the high-voltage distribution line is shaken by an earthquake or strong wind.
[0007]
(B) If there is a gap in the bonding surface between the fixed cylindrical body 6 of the mounting bracket 8 and the umbrella cover resin portion 3, the electric field between the conductor rod 7 and the fixed cylindrical body 6 of the mounting bracket 8 due to the presence of this gap. The distribution deteriorates (parts with high potential gradient occur), and the insulation strength decreases.
[0008]
(C) When the airtightness of the bonding surface between the fixed cylindrical body 6 of the mounting bracket 8 and the umbrella cover resin portion 3 decreases, rainwater passes through the bonding interface between the fixed cylindrical body 6 of the mounting bracket 8 and the umbrella cover resin portion 3. Or the like enters the electrical equipment container such as a transformer case, and the insulation performance of the electrical equipment is reduced.
[0009]
An object of the present invention is to provide a resin bushing that can sufficiently obtain an adhesive force with an umbrella cover resin portion even when a plating layer is provided on a mounting bracket.
[0010]
[Means for Solving the Problems]
The present invention is a resin bushing body composed of a cylindrical core resin part and an umbrella cover resin part integrally provided so as to cover the surface thereof, and is fixed to the outer periphery of the resin bushing body at the lower part of the umbrella cover resin part The resin bushing is provided with a mounting bracket, and the mounting bracket is provided with a plating layer.
[0011]
The resin bushing according to the present invention is characterized in that the surface of the mounting metal fitting in contact with the umbrella cover resin part is a surface in which the surface of the metal material constituting the mounting metal fitting is exposed without being provided with a plating layer. To do.
[0012]
As described above, when the surface of the mounting bracket in contact with the umbrella cover resin portion is a surface where the surface of the metal material constituting the mounting bracket is exposed without providing a plating layer, the umbrella cover resin portion and the mounting bracket Adhesive strength is improved. For this reason, the mechanical strength of the resin bushing can be prevented from being lowered, the insulation strength can be prevented from being lowered, and the insulation performance of the electrical equipment to which the resin bushing is connected can also be prevented.
[0013]
The present invention also includes a resin bushing body composed of a cylindrical core resin portion and an umbrella cover resin portion integrally provided so as to cover the surface thereof, and is fixed to the outer periphery of the resin bushing body at the lower portion of the umbrella cover resin portion. An annular flange fitting and an attachment fitting comprising a fixed cylindrical body integrated with the flange fitting, and a resin bushing provided with a plating layer on the attachment fitting are improved.
[0014]
In the resin bushing according to the present invention, the surface of the fixed cylindrical body in contact with the umbrella cover resin portion is a surface in which the surface of the metal material constituting the mounting bracket is exposed without the plating layer being provided. And
[0015]
Thus, when the surface of the fixed cylindrical body that is in contact with the umbrella cover resin portion is a surface on which the surface of the metal material constituting the mounting bracket is exposed without being provided with a plating layer, the umbrella cover resin portion with respect to the fixed cylindrical body This improves the adhesive strength. For this reason, the mechanical strength of the resin bushing can be prevented from being lowered, the insulation strength can be prevented from being lowered, and the insulation performance of the electrical equipment to which the resin bushing is connected can also be prevented.
[0016]
Also in resin bushing according to the present invention, the surfaces of the flange bracket in contact with the umbrella covering the resin portion and the fixed cylindrical member, the surface of a metal material plated layer constitutes the mounting bracket without being provided is exposed surfaces It can also be.
[0017]
In this way, if the surface of the flange metal fitting and the fixed cylindrical body in contact with the umbrella cover resin portion is a surface where the surface of the metal material constituting the attachment metal fitting is exposed without providing a plating layer , the flange metal fitting is fixed. The adhesive strength of the umbrella cover resin part to the cylindrical body is improved. For this reason, the mechanical strength of the resin bushing can be prevented from being lowered, the insulation strength can be prevented from being lowered, and the insulation performance of the electrical equipment to which the resin bushing is connected can also be prevented.
[0018]
In the resin bushing according to the present invention, the mounting bracket is made of an iron-based material.
[0019]
In this way, when the mounting bracket is formed of an iron-based material, the cost can be reduced.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a longitudinal sectional view of an essential part showing a first example of an embodiment of a resin bushing according to the present invention.
[0021]
In the resin bushing 1 of this example, the inner peripheral surface 6b of the fixed cylinder 6 of the mounting bracket 8 that contacts the extension 3a of the umbrella cover resin portion 3 is a non-plated portion where the plating layer M is not provided. . Other configurations are the same as those in FIGS. 3 and 4 described above, and corresponding portions are denoted by the same reference numerals.
[0022]
In this way, when the inner peripheral surface 6b of the fixed cylinder 6 in contact with the extension 3a of the umbrella cover resin portion 3 is a non-plated portion where the plating layer M is not provided, the umbrella cover resin for the fixed cylinder 6 is provided. The adhesive strength of the part 3 is improved. Therefore, the mechanical strength of the resin bushing 1 can be prevented from being lowered, the insulation strength can be prevented from being lowered, and the insulation performance of the electrical equipment to which the resin bushing 1 is connected can be prevented from being lowered. Moreover, since the flange metal fitting 5 and the fixed cylinder 6 which comprise the attachment metal fitting 8 are formed with the iron-type material, cost reduction can be aimed at.
[0023]
FIG. 2 is a longitudinal sectional view of an essential part showing a second example of the embodiment of the resin bushing according to the present invention.
[0024]
In the resin bushing 1 of this example, the surfaces of the flange fitting 5 and the fixed cylinder 6 that are in contact with the umbrella cover resin portion 3 are non-plated portions where the plating layer M is not provided. In this example, the inner peripheral surface 5a, the upper surface 5b, and the outer peripheral surface 5c of the flange metal fitting 5 are non-plated portions, and the inner peripheral surface 6b of the fixed cylinder 6 is not plated with no plating layer M provided thereon. Has become a department. Other configurations are the same as those in FIGS. 3 and 4 described above, and corresponding portions are denoted by the same reference numerals.
[0025]
Thus, when the surfaces of the flange metal fitting 5 and the fixed cylindrical body 6 that are in contact with the umbrella cover resin portion 3 are non-plated portions where the plating layer M is not provided, the flange metal fitting 6 and the fixed cylindrical body 6 are not affected. The adhesive strength of the umbrella cover resin part 3 is improved. Therefore, the mechanical strength of the resin bushing 1 can be prevented from being lowered, the insulation strength can be prevented from being lowered, and the insulation performance of the electrical equipment to which the resin bushing 1 is connected can be prevented from being lowered.
[0026]
In the above examples, the non-plated portion is formed on the mounting bracket 8 by dividing the portion to be plated by the masking portion and the portion not to be plated, or after plating the entire portion, a paper file is formed at the portion where the non-plated portion is formed. The plating process may be removed by hanging or flap foil, or by removing the plating with chemicals.
[0027]
【The invention's effect】
In the resin bushing according to the present invention, the surface of the mounting bracket that contacts the umbrella cover resin portion is a surface where the surface of the metal material that constitutes the mounting bracket is not provided with a plating layer , The adhesive strength between the umbrella cover resin part and the mounting bracket is improved. For this reason, the mechanical strength of the resin bushing can be prevented from being lowered, the insulation strength can be prevented from being lowered, and the insulation performance of the electrical equipment to which the resin bushing is connected can also be prevented.
[0028]
Further, in the resin bushing according to the present invention, the surface of the fixed cylindrical body that is in contact with the umbrella cover resin portion is a surface in which the surface of the metal material constituting the mounting bracket is exposed without the plating layer being provided. Therefore, the adhesive strength of the umbrella cover resin part with respect to the fixed cylinder is improved. For this reason, the mechanical strength of the resin bushing can be prevented from being lowered, the insulation strength can be prevented from being lowered, and the insulation performance of the electrical equipment to which the resin bushing is connected can also be prevented.
[0029]
Further, in the resin bushing according to the present invention, the surface of the flange metal fitting and the fixed cylindrical body that are in contact with the umbrella cover resin portion is the surface on which the surface of the metal material constituting the mounting metal fitting is exposed without providing a plating layer. Therefore, the adhesive strength of the umbrella cover resin part to the flange fitting and the fixed cylinder is improved. For this reason, the mechanical strength of the resin bushing can be prevented from being lowered, the insulation strength can be prevented from being lowered, and the insulation performance of the electrical equipment to which the resin bushing is connected can also be prevented.
[0030]
Furthermore, in the resin bushing according to the present invention, since the mounting bracket is formed of an iron-based material, the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an essential part showing a first example of an embodiment of a resin bushing according to the present invention.
FIG. 2 is a longitudinal sectional view of a main part showing a second example of an embodiment of a resin bushing according to the present invention.
FIG. 3 is a partially broken side view of a conventional resin bushing.
FIG. 4 is a longitudinal sectional view of a main part of a conventional resin bushing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Resin bushing 2 Core resin part 3 Umbrella cover resin part 3a Extension part 3b Cover part 3c Umbrella part 4 Resin bushing main body 5 Flange metal fitting 5a Inner peripheral surface 5b Upper surface 5c Outer peripheral surface 6 Fixed cylinder 6a Locking protrusion 6b Inner peripheral surface 7 Conductor rod 7a Threaded portion 8 Mounting bracket 9 Terminal bracket 10 Mounting bracket 11 Nut 12 Mounting seat 13 Hole portion 14 Packing 15 Hole portion 16 Fixing bracket 17 Coil spring 18 Screw hole 19 Fixing screw M Plating layer

Claims (4)

A resin bushing main body comprising a cylindrical core resin portion and an umbrella cover resin portion integrally provided so as to cover the surface thereof, and a mounting bracket fixed to the outer periphery of the resin bushing main body at the lower portion of the umbrella cover resin portion In the resin bushing in which the mounting bracket is provided with a plating layer,
The surface of the mounting bracket in contact with the umbrella cover resin portion is a surface in which a surface of a metal material constituting the mounting bracket is exposed without a plating layer. A resin bushing main body composed of a cylindrical core resin portion and an umbrella cover resin portion integrally provided so as to cover the surface thereof, and an annular shape fixed to the outer periphery of the resin bushing main body at the lower portion of the umbrella cover resin portion In the resin bushing provided with a mounting bracket comprising a flange bracket and a fixed cylindrical body integrated with the flange bracket, the mounting bracket is provided with a plating layer,
The resin bushing according to claim 1, wherein the surface of the fixed cylindrical body in contact with the umbrella cover resin portion is a surface in which a surface of a metal material constituting the mounting bracket is exposed without providing a plating layer. A resin bushing main body composed of a cylindrical core resin portion and an umbrella cover resin portion integrally provided so as to cover the surface thereof, and an annular shape fixed to the outer periphery of the resin bushing main body at the lower portion of the umbrella cover resin portion In the resin bushing provided with a mounting bracket comprising a flange bracket and a fixed cylindrical body integrated with the flange bracket, the mounting bracket is provided with a plating layer,
The surfaces of the flange metal fitting and the fixed cylindrical body that are in contact with the umbrella cover resin portion are surfaces on which the surface of the metal material constituting the attachment metal fitting is exposed without providing a plating layer. Resin bushing.   The resin bushing according to claim 1, wherein the mounting bracket is made of an iron-based material.

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