Conductive connecting piece for vacuum circuit breaker and vacuum circuit breaker

Abstract

The utility model relates to a conductive connecting piece for a vacuum circuit breaker and a vacuum circuit breaker, the conductive connecting piece is configured to be connected between an upper contact arm and an upper outgoing end line of the vacuum circuit breaker, the upper contact arm and an upper outgoing end line are spaced along the vertical direction, the conductive connecting piece comprises an upper connecting block which is aligned with the upper contact arm along the horizontal direction and is connected to the upper contact arm; the lower connecting block is aligned with the upper wire outlet end along the horizontal direction and is connected to the upper wire outlet end; and the conducting bar is connected between the upper connecting block and the lower connecting block and is integrally formed with the upper connecting block and the lower connecting block.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of power transmission and distribution, and in particular to an electrically conductive connecting piece for a vacuum circuit breaker, such as a medium voltage vacuum circuit breaker, and a vacuum circuit breaker. BACKGROUND

[0002] The distance between the upper and lower contact arms of the primary circuit of a vacuum circuit breaker, such as a medium voltage vacuum circuit breaker, has a fixed specification size according to different voltage levels. Since a large number of foreign medium voltage circuit breakers were used in the early days, the distance between the upper and lower contact arms of the primary circuit is quite different from the products on the market at present, especially for 10-35 kV vacuum circuit breakers. At present, the distance requirement between the upper and lower contact arms is achieved by multiple connections of conductive bars, conductive blocks and other parts. The connection of each conductive part uses an insulating heat shrink tube and a custom-made insulating box. The insulation process is complex, the installation of the insulating part is complex, the cost of the parts is high, and the use performance and overall aesthetics of the product are affected. CONTENT OF THE UTILITY MODEL

[0003] In order to overcome the above problems, the present disclosure provides an electrically conductive connecting piece for a vacuum circuit breaker, which is configured to be connected between an upper contact arm and an upper outgoing line end of the vacuum circuit breaker, the upper contact arm and the upper outgoing line end being spaced apart in a vertical direction, the electrically conductive connecting piece comprising:

[0004] an upper connecting block aligned with the upper contact arm in a horizontal direction and connected to the upper contact arm;

[0005] a lower connecting block aligned with the upper outgoing line end in the horizontal direction and connected to the upper outgoing line end;

[0006] a conductive bar connected between the upper connecting block and the lower connecting block and integrally formed with the upper connecting block and the lower connecting block.

[0007] Advantageously, the upper connecting block has a cylindrical shape, an axis of the cylinder extending in the horizontal direction, the upper connecting piece comprising a first end connected to the conductive bar and a second end opposite the first end, the upper connecting piece comprising a threaded hole extending from the second end towards the first end in the horizontal direction.

[0008] Advantageously, the lower connecting block has a cylindrical shape, an axis of the cylinder extending in the horizontal direction, the lower connecting block comprising a first end connected to the conductive bar and a second end opposite the first end, the lower connecting piece comprising a plurality of first through holes and a plurality of second through holes arranged in sequence from the second end to the first end in the horizontal direction, each second through hole being aligned with a corresponding first through hole and having a diameter greater than that of the corresponding first through hole, each first through hole and each second through hole being free of threads.

[0009] The conductive connecting piece includes an opening that penetrates the lower connecting block and the conductive row in a horizontal direction from one end of the plurality of second through holes away from the second end of the lower connecting block, and the opening is sized to enable external access to the plurality of second through holes.

[0010] Advantageously, the conductive connecting piece further includes an insulating piece inserted into the opening to block the opening.

[0011] Advantageously, the insulating piece includes a flat plate and a columnar portion inserted into the opening, and the flat plate is pressed against an outer surface of the conductive row.

[0012] Advantageously, the insulating piece includes a first annular groove and a second annular groove circumferentially disposed on the columnar portion, the first annular groove is disposed at one end of the columnar portion connected to the flat plate, the second annular groove is disposed at a free end of the columnar portion, and a sealing ring is respectively disposed in the first annular groove and the second annular groove.

[0013] Advantageously, the conductive connecting piece further includes an insulating layer disposed on a portion of the conductive connecting piece other than the threaded hole and the plurality of first through holes.

[0014] The disclosure also provides a vacuum circuit breaker including the conductive connecting piece as described above.

[0015] Advantageously, the vacuum circuit breaker includes an insulating sleeve respectively sleeved at a connection between the upper connecting block and the upper contact arm and a connection between the lower connecting block and the upper outgoing terminal.

[0016] Advantageously, the vacuum circuit breaker further includes an insulating support rod connected between the conductive row and a cover plate mounted to a housing of the vacuum circuit breaker.

[0017] The outgoing terminal of the primary circuit of the vacuum circuit breaker provided by the disclosure can not only realize the requirement that the distance between the upper and lower contact arms of the existing primary circuit can be adjusted by mounting the conductive connecting piece, but also realize the insulation requirement of the conductive connecting piece itself and the connection between the conductive connecting piece and the remaining conductive parts connected thereto. The conductive connecting piece is integrally formed, the remaining part thereof is integrally insulated except for the threaded hole of the upper conductive block and the plurality of first through holes of the lower conductive block, and the insulating layer along the surface of the conductor smoothly transitions at the connection between the upper conductive block and the lower conductive block and the conductive row, respectively; the insulating heat-shrinkable tube installed on the outer side of the contact surface between the contact arm and the upper conductive block of the conductive connecting piece plays a role in strengthening insulation; the insulating piece installed on the opening of the lower conductive block plays a role in strengthening insulation; and the insulating sleeve installed on the outer side of the upper outgoing terminal of the primary circuit of the medium-voltage circuit breaker plays a role in strengthening insulation. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and other features and advantages of the exemplary embodiments of the present application will become more apparent from the following detailed description, taken in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of the application. The description and drawings are given merely for illustrative purposes and are not intended to limit the scope of the application in any way. In the drawings:

[0019] Figure 1 A perspective view of a conductive connection according to the present disclosure is shown.

[0020] Figure 2 A cross-sectional view of a conductive connection according to the present disclosure is shown.

[0021] Figure 3 A schematic view of a vacuum circuit breaker according to the present disclosure is shown. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the technical scheme of the present disclosure clearer, the technical scheme of the embodiments of the present disclosure will be described clearly and completely in the following with reference to the drawings of the embodiments of the present disclosure. The same reference signs in the drawings represent the same components. It should be noted that the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present disclosure.

[0023] Compared with the embodiments shown in the drawings, the feasible implementation schemes within the protection scope of the present disclosure can have fewer components, have other components not shown in the drawings, have different components, have differently arranged components or differently connected components, etc. In addition, two or more components in the drawings can be implemented in a single component, or a single component shown in the drawings can be implemented as multiple separate components.

[0024] Unless otherwise defined, technical terms or scientific terms used herein shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first", "second", and similar terms do not imply any order, quantity, or importance, but are used to distinguish one element from another, and are used arbitrarily and merely for the purpose of description. When the number of components is not specified, the number of components can be one or more; similarly, the terms "one", "the", "said", and the like are not necessarily limited to a quantity of one. The terms "comprise", "comprising", and the like are intended to mean that the elements or objects listed after the terms are inclusive, not exclusive, and that other elements or objects are not excluded. The terms "upper", "lower", "left", "right", and the like are used to indicate relative positional relationships or positional relationships shown in the drawings when the device is used, and the relative positional relationships can also change accordingly when the absolute position of the described object changes. In addition, "connected" in this application should be understood as including electrical connections in addition to mechanical connections.

[0025] Figure 1 and Figure 2 respectively show a perspective view and a sectional view of a conductive connecting piece according to the present disclosure. The conductive connecting piece is used to connect an upper contact arm 12 of a vacuum circuit breaker and an upper outgoing terminal 16 of a pole 19. The conductive connecting piece is integrally formed and includes an upper conductive block 2, a lower conductive block 6, and a conductive strip 3 connected between the upper conductive block and the lower conductive block. The upper conductive block 2 is aligned with the upper contact arm 12 in a horizontal direction to be connected to the upper contact arm 12. The lower conductive block 6 is aligned with the upper outgoing terminal 16 in the horizontal direction to be connected to the upper outgoing terminal 16. The upper conductive block 2 and the lower conductive block 6 are spaced apart in a vertical direction.

[0026] Thus, for a vacuum circuit breaker in which the upper contact arm and the upper outgoing terminal are spaced apart in the vertical direction, a conductive strip of different length can be selected according to the distance of the spacing to connect the upper contact arm and the upper outgoing terminal, thereby adapting to the upper contact arm and the upper outgoing terminal spaced apart by different distances.

[0027] The upper conductive block 2 has a cylindrical shape with an axis extending in the horizontal direction. The upper conductive block 2 has a first end connected to the conductive strip 3 and a second end opposite the first end for connection to the upper contact arm. The upper conductive block 2 has a threaded hole 1 extending in the horizontal direction from the second end towards the first end, for receiving a bolt 14 to connect the upper contact arm and the upper conductive block. As shown in Figure 3 a first insulating sleeve 13, such as an insulating heat-shrinkable tube, is provided at the connection between the upper contact arm and the upper conductive block.

[0028] The lower conductive block 6 has a cylindrical shape, the axis of the cylinder extending in the horizontal direction. The lower conductive block 6 has a first end connected to the conductive bar 3 and a second end opposite the first end for connection to the upper terminal. From the second end towards the first end, the lower conductive block 6 comprises a plurality of first through holes 5, a plurality of second through holes 4 arranged in succession. As shown in Figure 1 each second through hole 4 is aligned with a corresponding first through hole 5 and has a diameter greater than that of the corresponding first through hole, each first through hole and each second through hole being free of threading. The plurality of first through holes 5 and the plurality of second through holes 4 are for receiving a plurality of bolts 15 for connecting the upper terminal to the lower conductive block.

[0029] The conductive connection further comprises an opening 7 extending through the lower conductive block and the conductive bar from one end of the plurality of second through holes, away from the second end of the lower conductive block, in the horizontal direction, the opening being sized to enable external access to the plurality of second through holes.

[0030] The lower conductive block 6 further comprises an insulating piece 10 inserted into the opening 7 to seal the opening. The insulating piece 10 comprises a flat plate and a cylindrical portion extending from the flat plate, the cylindrical portion being inserted into the opening, the flat plate being pressed against the outer surface of the conductive bar.

[0031] The insulating piece 10 comprises an annular groove 11 circumferentially provided on the cylindrical portion, the sealing ring 9 being provided in the annular groove 11. In the example shown in the figures, the annular groove 11 comprises a first annular groove provided at one end of the cylindrical portion connected to the flat plate and a second annular groove provided at the free end of the cylindrical portion, the sealing ring being provided in the first annular groove and the second annular groove, respectively.

[0032] The conductive connection further comprises an insulating layer 8 provided on the conductive connection except for the threaded hole and the plurality of first through holes, as shown in Figure 2 .

[0033] At the connection of the lower conductive block 6 and the upper terminal 16, a second insulating sleeve 17, for example an insulating heat-shrinkable tube, is provided.

[0034] With the conductive connection of the present disclosure, the distance between the upper conductive block 1 and the lower conductive block 6 can be selected, indirectly adjusting the distance between the upper contact arm 12 and the lower contact arm 20. In addition, when the length of the conductive bar 3 between the upper conductive block 2 and the lower conductive block 6 exceeds a certain distance, an insulating support rod (not shown) can also be installed between the conductive bar 3 and the cover plate 18 mounted to the housing of the vacuum circuit breaker. The cover plate serves as a barrier between the vacuum circuit breaker and the switchgear, meeting the protection level, which is well known to those skilled in the art, and therefore will not be described in detail.

[0035] The distance between the upper contact arm and the lower contact arm of the vacuum circuit breaker in the prior art is adjusted by using a conductive row or a conductive block to realize multiple times of conversion connection between the upper contact arm and the lower contact arm, the reliability of the multiple times of connection of the conductive loop is reduced, a special-shaped part is formed at the conductor connection, insulation processing is difficult, the cost is high, high-voltage discharge phenomenon is prone to occur, and the product performance is affected. The present disclosure adopts an integrally formed conductive connecting piece, after processing and forming, the whole is insulated except for the threaded hole and the light hole, the outer surface of the conductive connecting piece and the adjacent conductive part is connected and contacted to strengthen the insulation processing, both the matching requirement of the conductive loop and the connection strength are met, and the insulation problem of the conductive part in any outward direction is solved, and the whole processing can obtain excellent product insulation performance and beautiful appearance.

[0036] Although the present application has been described in the specification and illustrated in the drawings on the basis of various embodiments, it is understood by those skilled in the art that the above embodiments are only preferred implementation manners, and some technical features in the embodiments may not be essential to solve the specific technical problems, so that these technical features can be omitted without affecting the solution of the technical problems or the formation of the technical scheme; moreover, the features, elements and / or functions of one embodiment can be appropriately combined, combined or matched with the features, elements and / or functions of one or more other embodiments, unless the combination, combination or matching is obviously not implementable.

Claims

1. A conductive connector for a vacuum circuit breaker, the conductive connector being configured to connect between an upper contact arm (12) and an upper output terminal (16) of the vacuum circuit breaker, the upper contact arm (12) and the upper output terminal (16) being spaced apart in a vertical direction, characterized in that, The conductive connector includes: The upper connecting block (2) is aligned with the upper contact arm in the horizontal direction and connected to the upper contact arm (12). The lower connecting block (6) is aligned horizontally with the upper outgoing end and connected to the upper outgoing end (16). The conductive busbar (3) is connected between the upper connecting block (2) and the lower connecting block (6) and is integrally formed with the upper connecting block and the lower connecting block.

2. The conductive connector as described in claim 1, characterized in that, The upper connecting block (2) has a cylindrical shape with the axis of the cylinder extending in a horizontal direction. The upper connecting block (2) includes a first end connected to the conductive bus (3) and a second end opposite to the first end. The upper connecting block (2) includes a threaded hole (1) extending horizontally from the second end toward the first end.

3. The conductive connector as described in claim 2, characterized in that, The lower connecting block (6) has a cylindrical shape with its axis extending horizontally. The lower connecting block (6) includes a first end connected to the conductive busbar (3) and a second end opposite to the first end. The lower connecting block (6) includes a plurality of first through holes (5) and a plurality of second through holes (4) arranged sequentially from the second end towards the first end in a horizontal direction. Each second through hole (4) is aligned with a corresponding first through hole and has a diameter larger than the diameter of the corresponding first through hole (5). Each first through hole (5) and each second through hole (4) is not threaded. The conductive connector includes an opening (7) that extends horizontally through the lower connecting block and the conductive busbar from one end of the plurality of second through holes away from the second end of the lower connecting block. The opening (7) is sized to allow external access to the plurality of second through holes (4).

4. The conductive connector as described in claim 3, characterized in that, The conductive connector also includes an insulating element (10) inserted into the opening (7) to seal the opening.

5. The conductive connector as described in claim 4, characterized in that, The insulating element (10) includes a flat plate and a columnar portion inserted into an opening, the flat plate pressing against the outer surface of the conductive busbar.

6. The conductive connector as described in claim 5, characterized in that, The insulating component (10) includes a first annular groove and a second annular groove circumferentially disposed on the columnar portion. The first annular groove is disposed at one end of the columnar portion connected to the plate, and the second annular groove is disposed at the free end of the columnar portion. The sealing ring (9) is disposed in the first annular groove and the second annular groove respectively.

7. The conductive connector as described in claim 3, characterized in that, The conductive connector further includes an insulating layer (8) disposed on the portion of the conductive connector other than the threaded hole and the plurality of first through holes.

8. A vacuum circuit breaker, characterized in that, The vacuum circuit breaker includes a conductive connector as described in any one of claims 1 to 7.

9. The vacuum circuit breaker as described in claim 8, characterized in that, The vacuum circuit breaker includes a first insulating sleeve (13) fitted at the connection between the upper connecting block and the upper contact arm, and a second insulating sleeve (17) fitted at the connection between the lower connecting block and the upper outgoing end.

10. The vacuum circuit breaker as claimed in claim 8, characterized in that, The vacuum circuit breaker also includes an insulating support rod connecting the conductor bar and the sealing plate mounted to the housing of the vacuum circuit breaker.

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