CH683731A5 - Device for adjustably supporting an electric element inside of a closed container. - Google Patents

Description

1

CH 683 731 A5

2

Description

The invention relates to a device for supporting, in an adjustable manner, an electrical element inside a closed container and, more particularly, an adjustable support for busbar placed inside a hermetically closed container of an electrical appliance insulated by means of a gas.

Figs. 1 and 2 show, in sectional view, an example of a busbar support of the usual type described in Japanese patent publication No. 54-25 228, FIG. 2 being a sectional view along the plane II-II of FIG. 1. In these figures, a conductor 1 mounted as a bypass is contained inside a container 8 and a connection conductor 2, to which a bus bar (not shown) is connected, is electrically connected to it. The connecting conductor 2 is fixed by bolts 14 to a metal frame 20 at one end of an insulating support 21. The other end of the insulating support 21 is provided with a metal frame 22 fixed to a mounting plate 23 at means of bolts 16.

The container 8 is provided with a mounting base 24, mounted by welding on its inner surface, the mounting plate 23, in the form of a disc, being fixed on this mounting base by means of adjustment bolts 25 and of fixing 26. The adjustment bolts 25 are arranged at equal angular intervals, as illustrated in FIG. 2, and are engaged by thread with the mounting plate 23, their points abutting on the upper surface of the mounting base 24, which makes it possible to adjust the distance between the mounting plate 23 and the mounting base 24 by the adjustment effect of screw supports of the adjustment bolts 25. The fixing bolts 26 are arranged between the adjustment bolts 25, at equal angular intervals, as illustrated in FIG. 2. The fixing bolts 26 pass through the mounting plate 23 and are screwed into the mounting base 24 to securely fix the mounting plate 23 to the mounting base 24. In order to block the adjustment bolts 25 to prevent their loosening, each of the adjustment bolts 25 is provided with a locking screw 27.

When it is desired to fine-tune the positions of the connecting conductor 2 and / or the bypass conductor 1, the adjustment bolts 25 are maneuvered so as to correctly adjust the spacing between the mounting plate 23 and the base of mounting 24, the fixing bolts 26 and the locking screws 27 being loose. The fixing bolts 26 are then screwed in order to securely fix the mounting plate 23 to the mounting base 24, and the locking screws 27 are also fully screwed in order to block the adjusting bolts 25.

Due to the arrangement which has just been described of the adjustable support of known type making it possible to support, in an adjustable manner, an electrical element, such as a bus bar, inside a closed container, the operation position adjustment and tightening must be carried out in a tightly delimited space inside the closed container. Consequently, these operations are difficult and not very rational, and there is the problem of introducing undesirable foreign matter inside the container, which makes it necessary to clean it. Also, when the interior space of the closed container is too congested or insufficient to allow access, it is not possible to use the adjustable support which has just been described. Another possibility consists in placing the adjustable support in a particular position chosen in advance and allowing the adjustment to be carried out, which limits the possible location for the support to a closely delimited region.

Consequently, one of the aims of the present invention is to provide an adjustable support for an electrical element, placed inside a closed container, this support not having the abovementioned drawbacks.

Another object of the invention is to provide an adjustable support for an electrical element placed inside a closed container, this support making it possible to carry out, in a rational and efficient manner, the adjustment and screwing operation.

Another object of the invention is to provide an adjustable support for an electrical element placed inside a closed container, making it possible to avoid the introduction of foreign matter inside the container.

Another object of the invention is to provide an adjustable support for an electrical element placed inside a closed container, which can be easily used in a hermetically closed electrical appliance.

Another object of the invention is to provide an adjustable support for an electrical element placed inside a closed container, this support being able to be mounted in practically any location of a hermetically closed electrical appliance.

To this end, the support according to the invention is as specified in claim 1.

According to a particularly advantageous embodiment, the adjustable mounting means comprise a support with an adjusting screw disposed between the insulating spacer and the container, for adjusting the relative position of this spacer with respect to this container. . Advantageously, the adjustable mounting assembly comprises a mounting plate fixed to said other end of the insulating spacer, a fixing bolt screwed into the mounting plate and having a rod passing through a part of the wall of the container and a head placed outside this mounting plate, a hollow adjusting bolt disposed around this locking bolt, between the mounting plate and the bolt head, the adjusting bolt being threaded with said part of the container wall, and a lock nut, threaded into engagement with the adjustment bolt, for locking the axial position of the adjustment bolt relative to said portion of the container wall. This part of the wall of the container can be an inner rim extending from a tubular appendage which forms a well in which the insulating spacer is, at least in part, housed.

5

10

15

20

25

30

35

40

45

50

55

60

65

2

3

CH 683 731 A5

4

Other objects and advantages of the invention will be clearly highlighted thanks to the detailed description which follows of a particular embodiment of the invention, with reference to the appended drawing, in which:

Fig. 1 is a sectional view of an adjustable device, of the usual type, for supporting an electrical element inside a closed container;

Fig. 2 is a sectional view along the plane II-II of FIG. 1;

Fig. 3 is a schematic view, in partial section, showing a gas-isolated circuit breaker, comprising the adjustable support according to the invention;

Fig. 4 is a sectional view of an adjustable support for an electrical element disposed inside a closed container, this support being arranged in accordance with the invention;

Fig. 5 is a sectional view along the plane V-V of FIG. 4;

Fig. 6 is a partial view, on an enlarged scale, of the adjustable support according to the invention, as illustrated in FIG. 4; and

Fig. 7 is a sectional view showing the way in which the position of the conductor can be adjusted.

Figs. 3 to 7 show an adjustable support for an electrical element arranged inside a closed container, in accordance with the present invention. In the illustrated embodiment, the adjustable support is used in a gas-insulated three-phase circuit switch 30, as shown in FIG. 3. The circuit switch 30 comprises a container 31, hermetically closed, filled with gas, three bus bars 32 placed inside the container 31, bypass conductors 33 connected to the respective bus bars 32 and three interrupt units 34 connected to the branch conductors 33. Each of the interrupting units 34 comprises a fixed contact 35, fixed to the branch conductor 33, a movable contact 36 and an actuating mechanism 37 for moving the movable contact 36 between its positions. opening and closing.

It can be seen that the bypass conductor 33 from the center, as illustrated in FIG. 3, is connected to the busbar 32 by means of a connecting conductor 38 which is mechanically supported on the bottom of the container 31 by the adjustable support 40 according to the invention. The adjustable support 40 plays an important role in precisely positioning the supported electrical element, such as the bus bar 32 and the contacts 35 and 36 of the interrupting unit 34. In fact, these are not often not in the desired position due to dimensional tolerances during the manufacture and assembly of the elements. In particular, the relative position of the fixed and mobile contacts 35 and 36 must be precisely maintained in order to obtain a satisfactory interrupting effect on the interrupting units 34.

Figs. 4 to 7 show details of the adjustable support 40 according to the invention, as illustrated in FIG. 3 which shows that the adjustable support 40 is used to support the bypass conductor 33 as well as the connecting conductor 38 relative to the closed container 31. The support 40 comprises an electrically insulating spacer 41, of generally essentially cylindrical shape, connected at one of its ends (namely the upper end, as illustrated in FIG. 4) to the connecting conductor 38, by means of a metal frame 42 inserted in the insulating spacer 41 and a bolt 43 screwed into the metal frame 42. The other end of the insulating spacer 41 (that is to say the lower end, as illustrated in FIG. 4) also has a metal frame 44 inserted by molding.

In order to adjustably support the other end of the insulating spacer 41 with respect to the wall of the container 31, an adjustable mounting assembly 45 is connected between the other end (lower end) of the piece d electrical insulating space 41 and the wall of the container 31. The wall of the container 31 has a tubular appendage 46 which extends outwards (that is to say downwards as illustrated in FIG. 4) in forming a well 46a or a cylindrical space in which the lower end of the insulating spacer 41 is, at least partially, housed. The wall of the container 31 also comprises an annular plate or an inner rim 47 extending from a median part of the inner surface of the tubular appendage 46. The inner rim 47 is welded to the appendage tubular 46 and can be considered as constituting a part of the wall of the container 31, and it has a plurality of threaded holes 48 (fig. 6) whose function will be indicated in the following description. The tubular appendage 46 also has an outer flange 49 for hermetically, but removably fixing, an access cover 50 by a suitable fastening means, such as bolts and nuts 51. As illustrated in FIG. 7, the inner rim 47 can also form an integral part of the wall of the container 31.

The adjustable mounting assembly 45 comprises a mounting plate 52 having essentially the general shape of a disc, fixed in its center to the lower end of the insulating spacer 41, by means of attachment bolts 53. A plurality of fixing bolts 54 is threaded into the mounting plate 52 along the outer edge of the mounting plate 52, at equal angular intervals, as shown in FIG. 5. In the illustrated embodiment, the number of the fixing bolts 54 is eight.

As best seen from fig. 6, each of the fixing bolts 54 has a rod 55 freely passing through the threaded hole 48 of the internal collar 47 and a head 56 at the end of the rod 55, on the opposite side of the internal collar 47. A hollow adjustment bolt 57 is placed around the rod 55 of the locking bolt 54 and between the mounting plate 52 and the bolt head 56, via a washer 58. The adjusting bolt 57 is threaded with the threaded hole 48 of the inner flange 47. Consequently, the distance between the mounting plate 52 and the inner flange 47 is determined by the axial position of the

5

10

15

20

25

30

35

40

45

50

55

60

65

3

5

CH 683 731 A5

6

adjustment bolt 57 relative to the inner flange 47, and it can be adjusted by the adjustment screw support mechanism composed of the adjustment bolts 57 and the inner flange 47. A locking nut 59 is engaged by thread with the external thread of the adjustment bolt 57, in order to prevent the bolt 57 from rotating relative to the internal flange 47, so that the axial position of the adjustment bolt 57 relative to the internal flange 47 cannot be changed.

When it is desired to adjust the position of the connecting conductor 33 relative to the wall of the container 31, in order to maintain a precise relative position between the fixed and movable contacts 35 and 36, for example, the fixing bolts 51 are removed in order to allow the access cover 50 to be removed while allowing access to the adjustable mounting assembly 45 placed inside the container 31, from the outside of the latter. The locknuts 59 of the adjustment bolts 57 are loosened and the adjustment bolts 57 are rotated by means of an appropriate tool so as to adjust their axial position relative to the inner flange 47, by means of a suitable tool, such as a socket wrench (not shown) inserted from the outside of the wall of the container 31. By suitably choosing the adjustment bolts 57 to be operated as well as the amplitude of screwing, can obtain a precise adjustment of the position of the bypass conductor 33 and the connecting conductor 38. FIG. 7 illustrates an example of such an adjustment from which it appears that the adjustment bolt 57 on the right of the figure is placed lower than the adjustment bolt 57 on the left, so that the mounting plate 52 fixed on the inner flange 47 and, consequently, the bypass conductor 33, can be tilted at an angle e relative to the vertical position illustrated in FIG. 4. When all of the adjustment bolts 57 are raised or lowered at the same point, the conductors 33 and 38 supported by the adjustable mounting assembly 45 are moved in translation.

As appears from the above description, the bolt adjustment and locking operations can be carried out entirely from the outside of the wall of the container 31, when the access cover 50 is removed, so that the maneuver is very easy compared to that of the device of the usual type illustrated in FIGS. 1 and 2. Also, since there is no locking screw extending laterally and that the locking nut can be accessed vertically, it is not necessary to provide lateral access to the locking mechanism.

Also, since the fixing bolts 53 are inserted essentially concentrically into the hollow adjustment bolts 57, the arrangement of the adjustable mounting mechanism 45 is much simpler than the arrangement of the usual type illustrated in FIGS. 1 and 2, and the number of parts to be clamped is notably reduced, for example by half, compared to the case of the device of the usual type shown in FIGS. 1 and 2.

In addition, the tubular appendage 46 forms, with the inner flange 47 and the access cover 50, the well or a region of low voltage which serves as a particle trap and in which the electrically conductive foreign matter, which is found at the interior of the hermetically sealed container 31 is retained.

Claims (5)

Claims 1. Adjustable support for an electrical element placed inside a closed container, characterized in that it comprises: - an electrically insulating spacer connected to one of its ends to said electrical element to be supported; - adjustable mounting means, connected between the other end of said electrically insulating spacer and said container, to support, in an adjustable manner, said electrical element in said container with a relationship between them such as the position of said electrical element relative to said container is adjustable from the outside of this container; and - An access cover, removably attached to said container, for hermetically closing the interior of the container as well as said adjustable mounting means, relative to the outside space, this access cover allowing, in the position of opening, to access said adjustable mounting means from the outside of said container. 2. Adjustable support according to claim 1, characterized in that said adjustable mounting means comprise a screw support, disposed between said insulating spacer and said container, for adjusting the relative position of this insulating spacer with respect to to this container. 3. adjustable support according to claim 2, characterized in that said mounting means adjustable by screw support comprise a mounting plate fixed on said other end of the insulating spacer and on which is mounted a plurality of said adjustment screws . 4. Adjustable support according to claim 1, characterized in that said adjustable mounting means comprise: - a mounting plate fixed to said other end of said insulating spacer, - fixing bolts engaged by thread with said mounting plate and having their rod extending through part of the wall of the container and their head placed outside this mounting plate, hollow adjustment bolts each disposed around said fixing bolts, between said mounting plate and said bolt head, these adjustment bolts being engaged by threading with said part of the wall of the container, and - Lock nuts engaged by thread each with said adjustment bolts, to lock the axial position of the latter relative to said part of the wall of the container. 5. Adjustable support according to claim 4, characterized in that said part of the wall of the container is an inner rim extending from a tubular appendage which forms a well in which said insulating spacer is, at least partly housed. 5 10 15 20 25 30 35 40 45 50 55 60 65 4