JPH0312006Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to an insulating spacer for gas-insulated electrical appliances that is provided with centering means for facilitating connection work with a high-voltage conductor.

[Prior art and its problems]

FIG. 1 is a side sectional view of a conventional insulating spacer, showing one state in which the insulating spacer is attached to a horizontally arranged closed container of a gas insulated electric appliance. In the figure, 1 and 2 are a pair of airtight containers for gas-insulated electrical appliances, with flanges 1A and 2, respectively.
Equipped with A. High-voltage conductors 3A and 3B are supported by support members (not shown) at the center of the closed containers 1 and 2, respectively. Reference numeral 4 denotes an insulating spacer, which is made up of a connecting fitting 5, a cured cast resin 6, and an outer ring 7, which conductively connects both ends of the connecting fitting 5 to the high voltage conductors 3A and 3B so that their end surfaces coincide with each other, and connects the outer ring to the high voltage conductors 3A and 3B. 7 and a pair of flanges 1A and 2A are tightened with a plurality of bolts 8, and the flanges 1A and 2A and the outer circumferential ring 7 are tightened with a plurality of bolts 8.
A sealing material 9 such as an O-ring is provided between the hardened resin material 6 and the hardened resin material 6 to maintain airtightness. By the way, the cast resin cured material 6 constituting the insulator of the insulating spacer 4 undergoes curing shrinkage and shrinks during the process of casting thermosetting resin containing an inorganic filler and heating and hardening it, and further shrinks. Because heat shrinks during the process of cooling the spacer to room temperature,
The finished cast resin cured material 6 of the insulating spacer (hereinafter referred to as insulator) is approximately 1% of the inner diameter of the mold.
It is normal for the dimensions to be somewhat shrunken. Therefore, the connecting fitting 5 and the insulator 6 are brought into extremely tight contact with each other due to the stress caused by the shrinkage of the insulator, and it is possible to prevent the flow of insulating gas at the interface between the two. However, a gap G is created between the outer peripheral ring 7 and the insulator 6, which are made of iron, for example, as the insulator 6 contracts. In particular, the first
A pair of airtight containers 1 and 2 arranged horizontally as shown in the figure
When attempting to attach the insulating spacer 4 between the connecting fittings 5 and A problem arises in that the high voltage conductors 3A and 3B are eccentric by g.
Therefore, in order to conductively connect the end surfaces of the connecting fitting 5 and the end surfaces of the high voltage conductors 3A and 3B so that they match each other, the conductors must first be aligned and connected while the insulating spacer 4 is suspended. ,
Next, it is necessary to align the outer ring 7 and the flanges 1A and 2A and connect them with the bolts 8, which complicates the installation work of the insulating spacer and causes an economic disadvantage in that it takes a lot of man-hours and time. There are drawbacks. The insulating spacer 4, which originally has an outer circumferential ring, has an insulator 6 when the insulating spacer is fixed between the flanges with bolts 8.
In addition to preventing damage to the insulator due to excessive tightening force applied to the insulator, the insulating spacer and outer ring are supplied as an integrated part, thereby simplifying the installation work and sealing work in the airtight container. It is something. However, as mentioned above, due to the unforeseen problem of complicating the installation process due to the gap created between the outer ring and the insulator, the reality is that the originally intended function cannot be utilized. be.

[Purpose of invention]

This idea was created in view of the above-mentioned situation.
It is an object of the present invention to provide a gas insulated electric appliance that is equipped with an insulating spacer that is equipped with means for adjusting the relative position of an outer ring and an insulator and that can be easily incorporated into the gas insulated electric appliance.

[Key points of the idea]

The insulating spacer of the present invention has a plurality of screw holes provided in the outer ring at intervals in the circumferential direction so as to pass through the outer ring in the radial direction, and a tip portion of the insulator that is screwed into each screw hole. The insulator is easily held concentrically with the outer circumferential ring by providing centering means consisting of a push screw that abuts the outer circumferential surface.

[Example of idea]

The present invention will be explained below based on examples.

FIG. 2 is a side sectional view showing an embodiment of the present invention. In the figure, the outer ring 11 constituting the insulating spacer 4 has screw holes 13 provided at equal intervals in the circumferential direction with a center angle of 120 degrees, for example.
and a centering means 12 consisting of a set screw 14 which is screwed into each screw hole and whose tip abuts against the outer circumferential surface of the insulator 6.
It is configured such that the relative positional relationship in the radial direction with respect to 1 can be freely adjusted. Therefore, the insulating spacer configured as described above is, for example, an insulator 6.
is adjusted and held by a centering means so that it is concentric with the outer circumferential ring 11, and for example, a contact (not shown) provided between the high voltage conductor 3A and the connecting fitting 5 held in advance at the central position of the closed containers 1 and 2. If the children are connected to each other, the relative positions of the outer ring 11 and the flange 1A coincide without any effort, so that the operation of connecting the closed container 2 and the closed container 1 can be carried out easily. In addition, when the position of the high voltage conductor 3A is held at the center position of the sealed container by determining the center position of the connecting fitting 5, first align the outer circumferential ring 11 and the flange 1A, as described above. Assembly work can be easily carried out.

Also, the axial thickness of the outer ring 11 and the insulator 6
If the thicknesses of the outer circumferential portions of the two flanges are made substantially equal, the outer circumferential ring and the insulator 6 can be held between the pair of flanges 1A and 2A by the tightening force of the bolts 8. At this time, the airtightness between the two closed containers is maintained by the packing 9B that engages with the side surface of the insulator 6, and the airtightness between the closed containers and the outside air is also maintained by the packing 9A. Therefore, the packing 9A is only required to have the function of preventing rainwater etc. from entering the gap G, so for example, a water-blocking film may be applied in advance to the contact surface between the outer ring and the flange. Packing 9A
can be omitted. Moreover, the centering means 12
Since the gap between the screw hole 13 and the push screw 14 also serves as a path for water to enter, it is preferable to inject a water-blocking filler into part A in the figure to prevent water from entering.

Further, as mentioned above, the insulator 6 is connected to the pair of flanges 1
Since it is held between A and 2A, the set screw 14 can be removed after assembly is completed. By doing this, if the gap G changes due to a difference in the coefficient of thermal expansion between the insulator 6 and the outer ring 11, excessive stress will act between the push screw 14 and the insulator 6, resulting in poor insulation. The risk of damaging the body 6 can be avoided.

FIG. 3 is a sectional view of a main part showing a different embodiment of the present invention. 3 differs from the embodiment shown in FIG. 2 in that a resilient filler 21 is interposed in the gap G between the insulator 6 and the outer ring 11. That is, at the time when the connection between the connecting fitting 5 and the high voltage conductor 3A and the positioning between the outer circumferential ring 11 and the flange 1A are completed, and before installing the airtight container 2, insert a resilient material 21 such as a rubber plate into the gap G. When the assembly work is completed, the push screw 14 is removed, and the screw hole 13 is filled with a water-blocking filler if necessary. With this configuration, it is possible to avoid the risk of the push screw applying excessive stress to the insulator, and to prevent the insulator from moving for any reason.

FIG. 4 is a sectional view showing still another embodiment of the present invention, and the difference from the previous embodiment is that the push screw 2
4 is provided with a resilient buffer body 24A at the tip thereof. By configuring like this,
The relative position of the insulator 6 and the outer ring 11 can be maintained, and the thermal stress acting between the insulator 6 and the set screw 24 can be alleviated. Note that a water-blocking filler is injected between the push screw 24 and the outer ring 11 as necessary.

Note that when the insulating spacer is assembled into a horizontally arranged closed container, the desired purpose can be achieved by providing centering means at two locations on the lower half of the outer ring.

[Effect of idea]

As mentioned above, the present invention provides centering means consisting of screw holes and push screws at multiple locations on the outer circumferential ring of an insulating spacer in which the connecting fitting and the outer circumferential ring are integrally molded with resin. The gap between the insulator and the outer ring caused by curing shrinkage and heat shrinkage was adjusted so that the insulator could be held concentrically with the outer ring. As a result, the insulating spacer with an integrally molded outer ring can fully utilize the ease of integration into gas-insulated electrical appliances, which has not been utilized in the past despite its original properties, reducing assembly man-hours and assembly time. This can contribute to the provision of gas-insulated electrical appliances with less energy consumption. Furthermore, since the centering means of the present invention has an extremely simple structure and can be constructed at low cost, great economic effects can be obtained by simplifying the assembly work.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing how a conventional insulating spacer is incorporated into a gas insulated electrical appliance, Fig. 2 is a side sectional view showing an embodiment of the present invention, and Fig. 3 is a schematic diagram showing a different embodiment of the present invention. FIG. 4 is a sectional view of a main part showing still another embodiment of the present invention. 1, 2... Airtight container, 1A, 2A... Flange, 3A, 3B... High voltage conductor, 4... Insulating spacer, 5... Connection conductor, 6... Insulator (cast resin cured product), 7 , 11... Outer ring, 8... Bolt, 9... Packing, 12... Centering means, 1
3...screw hole, 14, 24...push screw, 21...
...filling, 24A...buffer, 25...filler,
G...Gap, 6A...Engaging portion.

Claims (1)

[Claims for Utility Model Registration] 1. A connection in which both ends in the axial direction are electrically connected to the high voltage conductor and a metal outer ring sandwiched between the flanges of a pair of airtight containers containing a high voltage conductor and an insulating gas. In an insulating spacer in which a metal fitting and an insulator made of a cured thermosetting resin are integrally molded, a pusher that comes into contact with an outer circumferential surface of the insulator to control the relative position in the radial direction between the insulator and the outer circumferential ring; An insulating spacer for a gas insulated electrical appliance, characterized in that a plurality of centering means each comprising a screw and a screw hole are provided on the lower half circumference side of the outer ring in the circumferential direction. 2. The insulating spacer for a gas-insulated electrical appliance as set forth in claim 1 of the utility model registration, characterized in that the push screw is provided with a buffer at the tip that comes into contact with the insulator.