JPH024964B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a ceramic insulator tube used for insulating conductive wires indoors and outdoors, and in particular, a ceramic insulator tube that has a built-in nonlinear resistance element that discharges abnormal voltage to the ground and restores the original state. This relates to the end structure of a lightning arrester insulator tube.

FIG. 1 shows an example of the end structure of a conventional insulator tube for a lightning arrester. In this conventional example, by tightening the bolt 4, the tip 5 of the fixing piece 3 presses the flange 6 forming the outwardly inclined surface of the insulator tube 1, and the insulator tube 1 and the pedestal 2 are connected. . When the flange 6 of the insulator pipe is pressed in the direction a by the fixed piece 3, a component force is generated in the direction c parallel to the contact surface between the fixed piece 3 and the flange 6, and a component force is generated in the direction b perpendicular to this on the contact surface of the fixed piece. A component force (drag force) acts. Since the fixed piece tends to wear off on the flange 6 due to the component force in the c direction, in the illustrated example, the fixed piece is held by a stopper 7 provided on the pedestal 2, and the fixed piece is moved outwardly. Preventing movement.

The conventional structure described above has the following drawbacks.

By adopting a configuration in which the position of the fixed piece is restricted using the stopper 7, the fixed piece cannot follow the chamfer tolerance of the inclined surface of the flange. The inclined surface of the flange is generally tapered to prevent stress concentration. Therefore, the inclined surface of the flange and the fixed piece do not come into suitable surface contact, and the fixed piece tends to be in a floating state because the fixed piece only partially contacts the inclined surface. Therefore, the tightening force of the fixing piece is applied locally to the inclined surface of the flange, making it difficult to sufficiently tighten the flange. Over-tightening the bolts may destroy the flange. There have been cases where the flanges are left untightened for fear of damaging them. Furthermore, with the conventional configuration described above, it is difficult to tighten the flanges with equal force for each fixing piece.

The object of the present invention is to eliminate a series of drawbacks of the prior art, and to provide an insulator pipe with a reliable clamping structure in which the clamping action is not unstable due to the chamfer tolerance of the inclined surface of the flange. The purpose is to provide an end structure.

In order to achieve this object, the present invention has a configuration in which inclined surfaces are formed at two locations on the fixed piece, and each of these inclined surfaces is brought into contact with an inclined surface of the flange and an inclined surface provided on a part of the pedestal. is adopted.

That is, in the present invention, a flange with an inclined surface is formed at the end of an insulator pipe placed on a pedestal, and a plurality of fixing pieces are attached to the insulating pipe that straddles between this flange and a part of the pedestal and faces the pedestal. When tightening with bolts, at least a part of the pedestal is formed with an inclined surface facing toward the insulator, and each fixing piece has an inclined surface in a part that contacts the flange and another part that contacts a part of the pedestal. The structure is formed as follows, and each of these is arranged.

By adopting this configuration, the two inclined surfaces of the fixed piece are sandwiched between the inclined surface of the flange and the inclined surface provided on a part of the pedestal, and the chamfer tolerance of the inclined surface of the flange is adjusted by the lateral movement of the fixed piece. is substantially erased by At the same time, as the fixed piece is tightened, the fixed piece is supported from both sides, and there is no movement of the fixed piece. As a result, the fixed piece and the slanted surfaces of the flange are always in wide contact with each other, and the tightening force of the fixed piece is spread to the slanted surface of the flange, making it possible to safely and reliably tighten the flange. The tightening force of each fixing piece can also be equalized.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Insulator tube 1 placed on pedestal 2 as shown in Figure 2
is a flange 6 whose end face has a cylindrical or polygonal appearance and has an inclined surface 13 facing outward and downward at the end.
is formed. A fixing piece 8 spans between the flange 6 of the insulator 1 and a part of the pedestal 2, and the insulator 1
is tightened toward pedestal 2. In the illustrated example, a cylindrical wall 9 is provided on a part of the pedestal 2 so as to stand up on the outside thereof. The tightening force of the fixed piece 8 for tightening the insulator pipe 1 to the pedestal 2 is the same as that of the fixed piece 8 and the pedestal.
The bolt 4 is provided so as to pass through two sides.

The fixing piece 8 includes inclined surfaces 10 and 11 at a portion that contacts the inclined surface 13 of the flange 6 and at another portion that contacts a part of the pedestal 2, respectively.
At the same time, an inclined surface 12 is also formed on a part of the base 2 that contacts the inclined surface of the fixed piece 8. Fixed piece 8
The inclined surfaces 10 and 11 are oriented in opposite directions with respect to each other.

By configuring as described above, the two inclined surfaces 10 and 11 of the fixed piece function as wedge surfaces that contact the inclined surface 13 of the flange and the inclined surface 12 of a part of the base 2. Therefore, by setting the inclination angles of the inclined surfaces of these fixing pieces 8 to angles that suit the inclination angles of the inclined surfaces 13 of the flange 6 and the inclined surfaces 12 formed on the pedestal 2, each of the fixed pieces 8 Slope 1
0 and 11 can be brought into surface contact with the flange 6 and the pedestal 2. Similarly, the dimensional tolerance of the inclined surface of the flange 6 can be eliminated by adjusting the position of the fixing piece.

As the bolt material 4 is tightened, two opposing c-component forces act along the two inclined surfaces of the fixing piece 8, as shown in FIG. If these c-component forces are balanced against the fixed piece 8, the fixed piece 8 will be tightened while remaining in the fixed position. When the force of the c component is unbalanced, the fixed piece 8 moves autonomously in either the left or right direction. Therefore, the fixed piece 8, the flange 6, and a part of the pedestal are always maintained in a good contact state, and local contact between the fixed piece 8 and the flange 6 can be prevented, and the tightening force is not applied to a part of the flange 6. I can't concentrate and participate.

FIGS. 3 and 4 are explanatory diagrams illustrating the operating function of the fixing piece 8 by comparing cases in which the inclined surface of the flange has and does not have a tolerance. That is, with reference to FIG. 3, there is a tolerance l between the flange and the flange as shown in FIG.
If there is, the fixing piece 8 can move upward and to the left to absorb this tolerance l.

The actions and effects described above apply to each fixed piece. Therefore, it is extremely easy to set the tightening force of each fixing piece equally.

The structure in this embodiment is not limited to that described above. For example, it is possible to interpose a seat plate between the fixed piece and the inclined surface of the flange, and between a part of the pedestal in contact with the fixed piece and the abutting fixed piece. Furthermore, the positional relationship between the two inclined surfaces of the fixing piece can be set to be symmetrical in the left and right lines.

According to the present invention, there is an advantage that the tolerance of the sloped surface of the flange can be absorbed by the sloped surface of the fixed piece, and the insulator pipe and the pedestal can be securely connected in a stable state.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view showing an end structure of a conventional insulator pipe, Fig. 2 is a longitudinal cross-sectional view showing an example of an end structure of an insulator pipe according to the present invention, and Figs. 3 and 4 are functions of a fixing piece. FIG. 1...Insulator, 2...Pedestal, 4...Bolt, 6...
...Flange, 8...Fixing piece, 9...Cylindrical wall, 10
~13...Slope surface.

Claims (1)

[Claims] 1. An insulator tube arranged on a pedestal and having an end flange formed with an inclined surface from the inside to the outside, and a plurality of fixing bolts tightened between the flange of the insulator tube and a part of the pedestal. At least a portion of the pedestal is provided with an inclined surface facing toward the insulator, and each of the fixed pieces corresponds to a portion that contacts the flange and another portion that contacts a portion of the pedestal, respectively. An end structure of an insulator tube, characterized in that the end portions of the insulator tube are arranged so as to form inclined surfaces. 2. The end structure of an insulator pipe according to claim 1, wherein each inclined surface of the fixed piece is formed in a substantially equal relationship.