JPH0728654Y2 - Salt resistant bushing - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a salt-resistant bushing used in high-voltage electrical equipment installed in a salt-damaged area.

[Conventional technology]

Conventionally, as this type of salt resistant bushing, as shown in FIG. 3, a lead wire insertion hole 3 penetrating in the axial direction and a central protruding portion 2 extending in a concentric cylindrical shape with the lead wire insertion hole 3 are provided. And a lead wire 5 through which a lead wire insertion hole 3 of the insulator pipe 1 is connected and connected to a main body of a high-voltage electric device (not shown). The lead wire insertion hole 3 and the lead wire 5 are integrally formed concentrically with each other. Then, a cylindrical groove 9 is formed around the lead wire 5, and a mold cone 6 provided with an annular bonding portion 7 facing the end face of the central protruding portion 2 is provided. The end face of the and the adhesive portion 7 are adhered via the adhesive 4,
A salt-resistant bushing 11 is proposed, which is obtained by injecting and hardening a filling resin 8 into the lead wire insertion hole 3 and the cylindrical groove 9 to solidify the lead wire 5, the mold cone 6 and the porcelain tube 1 integrally. Refer to Kokoku 44-4732).

[Problems to be solved by the device]

However, in the salt-resistant bushing 11 as described above, in order to prevent the peeling strength between the porcelain bushing 1 and the mold cone 6 from decreasing during assembly, the end face of the central protruding portion 2 of the porcelain bushing 1 and the bonding portion of the mold cone 6 are prevented. It is necessary to bond 7 and 7 to each other over the entire surface. Therefore, it is necessary to hold both by using a jig or the like so that the bonding surfaces of both will not be displaced until the adhesive 4 is cured. There is a problem that it takes a lot of time and effort to assemble.

An object of the present invention is to solve the above-mentioned problems and to provide a jig or the like for preventing the bonding surfaces of the both ends from being displaced from each other when bonding the end surface of the central protruding portion of the porcelain tube and the bonding portion of the mold cone. An object of the present invention is to provide a salt resistant bushing that can be assembled without using it, and that further enhances the peeling strength between the porcelain bushing and the mold cone to prolong the service life.

[Means for Solving the Problems]

In order to solve the above problems, the present invention provides a porcelain insulator having a lead wire insertion hole penetrating in the axial direction and a central protruding portion formed to extend concentrically with the lead wire insertion hole and the porcelain insulator. Of the lead wire that penetrates the lead wire insertion hole and is connected to the main body of the high-voltage electric device in a concentric conical shape, and forms an annular adhesive portion on the bottom surface of the conical surface that faces the end face of the central protruding portion of the porcelain insulator. Along with this, a central portion of the adhesive portion is provided with a mold cone having a cylindrical groove communicating with the lead wire insertion hole of the porcelain insulator at a predetermined depth, and the end face of the central protruding portion of the porcelain insulator and the mold cone. After bonding the adhesive part of the, the resin for filling is injected into the lead wire insertion hole of the porcelain tube and the cylindrical groove of the mold cone to cure, and the lead wire, the mold cone and the porcelain tube are integrally fixed. In salt resistant bushings consisting of At the periphery of the cylindrical groove formed in the central portion of the bonded portion of the mold cone, a cylindrical guide of a predetermined length that is loosely fitted to the open end of the lead wire insertion hole of the central protruding portion of the porcelain bushing is provided. Then, after this cylindrical guide is loosely fitted in the lead wire insertion hole of the central protruding portion of the porcelain bushing, the outer peripheral surface of the cylindrical guide and the inner wall surface of the lead wire insertion hole of the porcelain bushing and the bonding portion of the mold cone While filling the gap between the end surface of the central protruding portion of the porcelain tube and the adhesive to solidify, the inner peripheral surface of the cylindrical guide, the lead wire insertion hole of the central protruding portion of the porcelain tube, and the cylindrical shape of the bottom of the mold cone. The filling resin is injected into the groove and cured, and the filling resin is injected into the cylindrical groove and cured, and the cylindrical guide is sandwiched between the adhesive and the filling resin. In this state, it is fixed to the central protruding portion of the porcelain bushing. It is intended.

[Action]

At the time of assembling the salt-resistant bushing, by fitting a cylindrical guide protruding on the peripheral edge of the adhesive portion of the mold cone to the central protruding portion of the porcelain tube and bringing the adhesive surfaces of both into contact, The entire surface and the entire fitting portion of the guide are held and adhered to the adhesive surface of the central protruding portion of the porcelain tube without being displaced from each other, and the adhesive is cured.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. 1 and 2 are cross-sectional side views of the salt resistant bushing, and the same members as those shown in FIG. 3 are designated by the same reference numerals and will be described. In FIG. 1, 1 is a porcelain tube provided with a lead wire insertion hole 3 penetrating in the axial direction and a central projecting portion 2 extending in a concentric cylindrical shape, and 6 is
A lead wire 5 penetrating through the lead wire insertion hole 3 of the porcelain bushing 1 is integrally molded concentrically with a lead wire 5 which is connected to a main body of a high-voltage electric device (not shown). A ring-shaped adhesive portion 7 facing each other is formed, and a cylindrical groove 9 communicating with the lead wire insertion hole 3 is bored at a predetermined depth in the central portion of the adhesive portion 7. The lead wire insertion hole 3 of the central protruding portion 2 of the porcelain bushing 1 is provided around the periphery of
Is a mold cone formed by projecting a cylindrical guide 10 that is loosely fitted to the open end of the. Then, the adhesive 4 is applied to the end surface of the central protruding portion and the inner wall surface of the opening end of the lead wire insertion hole 3 to penetrate the lead wire 5 into the lead wire insertion hole 3 of the porcelain bushing 1, and then the guide 10 Are fitted to the central protruding portion 2 and the porcelain bushing 1 and the mold cone 6 are pressed against each other in the axial direction, the entire surface of the adhesive portion 7 of the mold cone 6 and the guide 10
The entire outer peripheral surface is bonded to the end surface of the central protruding portion 2 of the porcelain insulator 1 and the inner wall surface of the opening end portion of the lead wire insertion hole 3. At this time, the cylindrical guide 10 fitted in the lead wire insertion hole 3 prevents the positional displacement in the axial direction, that is, the adhesive surfaces are held without being displaced from each other, and the adhesive 4 is hardened. After the adhesive 4 is hardened, a filling resin 8 is injected into the inner peripheral surface of the cylindrical guide 10 and the lead wire insertion hole 3 of the porcelain bushing 1 and the cylindrical groove 9 on the bottom surface of the mold cone 6. After curing, the cylindrical guide 10 is sandwiched between the adhesive 4 and the filling resin 8, and the porcelain bushing 1, the mold cone 6 and the lead wire 5 are integrally fixed to assemble the salt resistant bushing 11.

In the salt-resistant bushing thus configured, not only the adhesive portion 7 of the mold cone 6 is adhered to the end surface of the central protruding portion 2 via the adhesive 4, but also the inner peripheral surface of the central protruding portion 2 is cylindrical. Since the outer peripheral surfaces of the guides 10 are adhered to each other by the adhesive 4, even if the adhesive area is increased and the adhesive force is increased, and the force for peeling the adhesive boundary surface acts on the lead wire 5, By firmly supporting it together with the solidified filling resin 8, the peel strength can be further increased as compared with the conventional one.

FIG. 2 shows another embodiment. Explaining the different points, the guide 10a is made to project cylindrically on the outer peripheral edge of the adhesive portion 7 of the mold cone 6, and the central protruding portion 2 of the porcelain bushing 1 is formed. It is formed so as to be fitted to the outer peripheral portion of the. In this case, the porcelain bushing 1 and the mold cone 6 are bonded to each other by applying the adhesive part 4 to the end surface and the outer peripheral end of the central projecting portion 2 to form the entire surface of the adhesive part 7 of the mold cone 6 and the inner peripheral surface of the guide 10a. The entire surface is bonded as in the above-described embodiment, and the filling resin 8 is injected and hardened in the same manner as described above to form the salt resistant bushing 11. Also in this embodiment, as described above, the assembly can be facilitated and the peel strength can be increased.

In the above embodiment, the guides 10 and 10a are described as being provided on either the inner peripheral edge or the outer peripheral edge of the adhesive portion 7 of the mold cone 6, but the cylindrical guides are provided on both the inner peripheral edge and the outer peripheral edge. It is needless to say that both guides may be fitted to the central projecting portion 2 and bonded to the central projecting portion 2 together with the bonding portion 7.

[Advantages of the Invention] As described above, the present invention provides a cylindrical guide projecting at the peripheral edge of a cylindrical groove formed in the center of the adhesive portion of the mold cone, and Since the mold cone was loosely fitted in the lead wire insertion hole of the central protruding portion of the porcelain bushing and the central protruding portion of the porcelain bushing was fixed using an adhesive and a filling resin, the mold cone is Also, since the adhesive can be applied to the entire outer peripheral surface of the cylindrical guide and fixed to the central protruding portion, when fixing the mold cone to the central protruding portion of the porcelain bushing, it is quick and easy without using a jig or the like. You can carry out the bonding work.

Further, the mold cone is capable of enlarging the bonding area with the central projecting portion of the porcelain bushing by the bonding portion formed on the bottom surface and the cylindrical guide protruding in the central portion of the bonding portion. After fixing the mold cone to the central protruding part of the porcelain bushing, the cylindrical groove formed in the central part of the bonded part and the inner peripheral surface of the cylindrical guide projecting at the peripheral edge of this groove, the lead penetrating through the porcelain pipe Since the filling resin is injected into the wire insertion hole to be cured, the cylindrical guide is fixed while the inner and outer peripheral surfaces thereof are sandwiched by the adhesive and the filling resin. The mechanical strength between the mold cone and the central projecting portion of the porcelain tube can be remarkably enhanced in combination with the expansion of the bonding area.

Further, since the mold cone and the central protruding portion of the porcelain tube are firmly fixed by the adhesive and the filling resin, a force acts to peel off the bonding boundary surface between the lead wire mold cone and the central protruding portion. Even in the case of the above, as a result of strengthening the mechanical strength of the adhesive boundary surface by the adhesive and the filling resin, the mold cone is never separated from the central protruding portion of the porcelain tube, and the salt-proof bushing The service life can be extended.

Further, in the mold cone, the cylindrical guide projecting from the bottom surface is firmly held at the opening end of the lead wire insertion hole of the porcelain bushing while being sandwiched by the adhesive and the filling resin. There is also an advantage that the mechanical strength between the mold cone and the central protruding portion of the porcelain tube can be enhanced without enlarging its shape.

[Brief description of drawings]

1 is a sectional side view showing an embodiment of the present invention, FIG. 2 is a sectional side view showing another embodiment of the present invention, and FIG. 3 is a sectional side view showing a conventional example. 1; Insulator, 2; Central protrusion, 3; Lead wire insertion hole 4; Adhesive, 5; Lead wire, 6; Mold cone 7; Adhesive, 8; Filling resin, 9; Groove 10, 10a; Guide, 11; Salt resistant bushing

Claims (1)

[Scope of utility model registration request] 1. A porcelain bushing 1 having a lead wire insertion hole 3 penetrating in the axial direction and a central projecting portion 2 formed in a concentric cylindrical shape with the lead wire insertion hole 3 and extending, and a porcelain bushing 1 of the porcelain bushing 1. A lead wire 5 penetrating through the lead wire insertion hole 3 and integrally formed with a lead wire 5 connected to the main body of the high-voltage electric device in a concentric conical shape, and an annular adhesive portion facing the end surface of the central protruding portion 2 of the porcelain bushing 1 on the conical bottom surface. 7
The porcelain insulator 1 is formed at the center of the adhesive portion 7 while forming the
And a mold cone 6 having a cylindrical groove 9 communicating with the lead wire insertion hole 3 of the above, and having a predetermined depth.
After adhering the end surface of the central protruding portion 2 and the bonding portion 7 of the mold cone 6, the filling resin 8 is injected into the lead wire insertion hole 3 of the porcelain bushing 1 and the cylindrical groove 9 of the mold cone 6 and cured. The lead wire 5, the mold cone 6 and the porcelain insulator 1
In the salt-resistant bushing 11 formed by integrally fixing and
At the periphery of the cylindrical groove 9 formed in the central portion of the adhesive portion 7 of the mold cone 6, a cylinder of a predetermined length is loosely fitted into the open end portion of the lead wire insertion hole 3 of the central protruding portion 2 of the porcelain bushing 1. After the cylindrical guide 10 is projected and the cylindrical guide 10 is loosely fitted in the lead wire insertion hole 3 of the central protruding portion 2 of the porcelain tube 1, the outer peripheral surface of the cylindrical guide 10 and the lead of the porcelain tube 1 are inserted. The adhesive 4 is filled into the gap between the inner wall surface of the wire insertion hole 3 and the bonding portion 7 of the mold cone 6 and the end surface of the central protruding portion 2 of the porcelain bushing 1, and the inner peripheral surface of the cylindrical guide 10 The filling resin 8 is injected into the lead wire insertion hole 3 of the central protruding portion 2 of the porcelain insulator 1 and the cylindrical groove 9 on the bottom surface of the mold cone 6 to cure the resin.
The cylindrical guide 10 is provided with the adhesive 4 and the filling resin 8
A salt resistant bushing characterized in that it is fixed to the central protruding portion 2 of the porcelain bushing 1 in a state of being sandwiched between and.