JPH0216643B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a conduit connection structure between one electrical device such as a capacitor, reactor, or switch, and a conduit connected to another electrical device such as a capacitor, reactor, or switch. It is something.

FIGS. 1 and 2 each show a conventional connection structure between a flange b provided on a conduit a fixed to a container T of one electric device and a conduit a' from the other electric device.

What is shown in Figure 1 is the outer periphery of the insulating spacer c.
Since the screw d of c' is provided and the flanges b and b' of both conduits a and a' are fixed by passing bolts e and e' through this part, the undulations and sagging of the flanges b and b' are caused. A load due to such deformation is directly applied to the insulating spacer c, which may cause distortion or destruction of the insulating spacer. Furthermore, if the outer periphery c' of the insulating spacer c reaches the outer periphery of the flanges b and b', the insulating spacer c will become very large, requiring a large amount of molding resin material, increasing the weight and increasing the cost. There are also problems.

The one shown in Fig. 2 does not use bolts, and the outer periphery c' of the insulating spacer c does not reach the outer periphery of the flanges b, b', thus eliminating the drawbacks of the one shown in Fig. 1. However, since the outer periphery is welded f, if any abnormality occurs in the pipes a, a' or in the main body of the electrical equipment, it will take a lot of effort to dismantle it.Furthermore, with this configuration, welding is done at the installation site, so this is a problem. There is also the disadvantage that the accompanying vacuuming inside the electrical equipment and the filling of insulating media such as insulating oil and gas can only be carried out at the installation site.

This invention has been made to solve the problems of the conventional products described above, and includes a flange provided on a container of one electrical device or a conduit fixed to the container;
In a conduit connection structure with a flanged conduit connected to the other electrical device, an insulating spacer with an outer diameter smaller than the outer diameter of both flanges and an insulating spacer with an outer diameter larger than the outer diameter of the insulating spacer are provided between the two flanges. A fixing member is interposed, and the fixing bolt head provided on the other flange is inserted through the hole and the bolt tightening hole provided on the fixing frame member is inserted into the female thread provided on one flange. The fixing frame member and one flange are fixed with a fixing bolt provided on the other flange, and a hole provided on the other flange through which the body of the fixing bolt is inserted, and a hole provided on the fixing frame member for tightening the bolt is provided on the other flange. A conduit characterized in that the two flanges are fixed with fixing bolts inserted through holes and screwed into female threads provided on one flange, alternating along the circumference of the two flanges. It is a connection structure.

An embodiment of the present invention will be described in detail below with reference to the drawings.

Fig. 3 shows its external structure, Fig. 4 shows its plane, Fig. 5 shows a longitudinal section along A-A in Fig. 4, and Fig. 6 shows a longitudinal section along B-B in Fig. 4. show.

1 and 2 are conduits, respectively; conduit 1 is fixed to a container (not shown) of one electrical device, for example, an oil-filled electrical device, and is provided with a flange 1'; conduit 2 is connected to the other electrical device ( (not shown) and is provided with a flange 2'. 3 is a conical-shaped insulating spacer with an open bottom made of synthetic resin such as epoxy resin, and 4 is a flat ring-shaped fixing frame member made of metal such as iron or stainless steel. , 2 are interposed in the connection. The flange 1' of the conduit 1 has a stepped cross section, for example, and has a thick wall part 5 on the outer circumference and a thin wall part 6 on the inner circumference.
The thick part 5 is provided with screws 7 arranged at the same interval on the same circumference and screwed into fixing bolts 13 and 14, and the upper surface of the thick part 5 and the thin part 6 are Gasket grooves 8, 8 are provided at circumferential positions. The flange 2' of the conduit 2 has a flat shape, and as shown in the plan view of the conduit 2 in FIG. A large diameter hole 9 through which the head is inserted and a small diameter hole 10 through which the body of the bolt 14 is inserted are provided alternately. The outer circumference 3' of the insulating spacer 3 is thick, and its thickness is slightly smaller than the thickness of the thick portion 5 of the flange 1. The fixed frame member 4 is also provided with bolt tightening holes 11 through which bolts 13 and 14 are inserted, at positions facing each of the screws 7, the large-diameter hole 9, and the small-diameter hole 10. ,
Gasket grooves 12, 12 are provided on the lower surface.

With one peripheral surface 31 of the outer peripheral part 3' of the insulating spacer 3 in contact with the thin part 6 of the flange 1', the fixing frame member 4 is inserted into the hole 11 of the flange 1' from the other peripheral surface 32 side. The bolts 13 are brought into contact with the screws 7 so as to match them, and the bolts 13 are screwed into every other bolt from the conduit 2 side. That is, in this state, the oil-filled electrical equipment is filled and sealed with insulating oil as an insulating medium, and after the oil-filled electrical equipment is completed, it can be sent from the factory to the installation site.

The conduit 2 is connected by fitting the head of the bolt 13 into the large diameter hole 9 of the flange 2', aligning the hole 10 with the hole 11 and the screw 7, and bringing it into contact with the fixed frame member 4. Holes 10, 11 and screw 7
Screw the bolt 14 inside and fix it.

Each gasket groove 8, 8, 12, 12 is used by fitting a gasket material, but as shown in the figure, the actual pressure on the outer circumference 3' of the insulating spacer 3 is applied to the insulating spacer 3 side of the fixed frame member 4. This is done by the gasket 12' in the gasket groove 12. Insulating oil from oil-filled electrical equipment is present in the conduit 1, and the outer circumference 3' of the insulating spacer 3 is used to seal this insulating oil.
The circumferential surface 31 of the flange 1' must be in close contact with the thin wall portion 6 of the flange 1' through the gasket 8', and therefore the repulsive stress of the gasket 12' must be greater than the repulsive stress of the gasket 8'. Therefore, when the gaskets 12' and 8' are of different shapes and materials, or when they are of the same shape and material, it is preferable that the depth of the gasket groove 12 be made shallower than the depth of the gasket groove 8.

In addition, in the above-mentioned embodiment, when tightening the insulating spacer 3 and the pipe line 1 and both pipe lines 1 and 2, the bolts 13,
14 and the screw 7 provided on the flange 1' of the conduit 1 are configured to be screwed together.
In place of the screws 7, holes may be provided through which the bolts 13 and 14 are inserted, and nuts or the like may be used to tighten them.In short, the structure is such that the connection relationship between these can be loosened without breaking the seal of at least one of the electrical devices. do it.

FIGS. 7 and 8 show other embodiments of the present invention, and parts given the same reference numerals as in FIGS. 3 to 6 indicate the same or corresponding parts.

To explain in detail another embodiment of the present invention shown in FIGS. 7 and 8, in the illustrated example, a flange 1' is directly fixed to the container T of one electric device by means such as welding, According to this embodiment, since the conduit 1 can be omitted, the height of the container T, that is, one of the electric devices can be reduced, which is convenient.

This invention is constructed as described above, and since the insulating spacer is not directly fastened with bolts, it does not receive any deformation stress, and has the advantage that the molding resin material of the insulating spacer can be saved because it can be made small. . For example, if the diameter of the insulating spacer is about 1 m, the resin material can be saved by 10 to 15%, which is a huge advantage in terms of cost. Furthermore, it is of course possible to transport the device to the installation site with the insulating medium oil sealed and the insulating spacer attached.

[Brief explanation of drawings]

1 and 2 are longitudinal sectional views showing different examples of the conventional example, FIGS. 3 to 6 show an embodiment of the present invention, FIG. 3 is a perspective view of the main part of the embodiment, and FIG. 5 is an enlarged vertical sectional view taken along the line AA in FIG. 4, and FIG. 6 is an enlarged sectional view taken along the line BB in FIG. 4. FIGS. 7 and 8 are longitudinal sectional views of different parts of other embodiments of the present invention. 1, 2...pipe line, 1', 2'...flange, 3...
...Insulating spacer, 4...Fixed frame member.

Claims (1)

[Claims] 1 In a conduit connection structure between a flange provided on a container of one electrical device or a conduit fixed to this container and a flanged conduit connected to the other electrical device, there is a An insulating spacer with an outer diameter smaller than the outer diameter of the flange and a fixing member with an outer diameter larger than the outer diameter of the insulating spacer are interposed, and a hole through which the head of a fixing bolt provided on the other flange is inserted, and the fixing frame. Fixing the fixed frame member and one flange with a fixing bolt inserted through a bolt tightening hole provided in the member and screwed into a female thread provided on one flange,
A fixing bolt inserted through a hole through which the body of a fixing bolt provided on the other flange is inserted and a bolt tightening hole provided on the fixed frame member and screwed into a female thread provided on one flange. A conduit connection structure characterized in that structures for fixing both flanges are formed alternately along the circumferences of both flanges.