A connector structure for self-pressurized nitrogen insulated casting busbar

Abstract

This paper proposes a connector structure for a self-pressurizing nitrogen insulated cast busbar. The connector protective shell includes a cover plate, a side plate, a silicone ring and a silicone pad. The silicone ring is arranged on the outer side of the end of the busbar body, and side plates are arranged on the front and rear sides of the silicone ring. Cover plates are arranged on the upper and lower sides of the silicone ring. Silicone pads are arranged on the inner side of the cover plate. A pressure-maintaining valve is penetrated through the central surface of the cover plate. The front and rear bottom sides of the cover plate are respectively connected to the edges of the side plates. The surface of the sealing edge and the silicone ring are squeezed and fitted with each other. The upper and lower ends of the sealing edge are connected to the cover plate by bolts. By using the sealing effect, the interior of the connector is absolutely sealed, so that nitrogen can be poured into the interior, which meets the on-site pouring-free installation construction, solves the problem of on-site pouring of the cast busbar, and achieves a non-casting type cast busbar for the connector, which is convenient for later maintenance, on-site installation and maintenance.

Description

Technical Field

[0001] The present invention belongs to the technical field of busbar connectors, and specifically relates to a connector structure for a self-pressurized nitrogen-insulated cast busbar. Background Art

[0002] With the development of the times and the progress of science, many chemical giants have emerged in China, as well as new rail transit projects in various places. All of them prefer cast busbars without exception.

[0003] They need cast busbars to meet their needs for acid and alkali corrosion resistance, waterproofing, and explosion resistance, but cast busbars need to be cast on site, which has high requirements for the on-site environment: the castable cannot solidify normally when the temperature is below freezing; casting in the humid rainy season may cause low insulation resistance; the castable needs to be mixed in proportion during casting and needs to be vibrated to remove bubbles, etc. These problems continue to affect customers' demand for cast busbars.

[0004] Cast busbars are also called four-proof busbars because of their full casting and corrosion resistance. Although cast busbars have powerful performance, they have a defect: the connectors must be cast on site. This requirement discourages many customers who want to use cast busbars but do not have on-site conditions. Utility Model Content

[0005] In order to solve the above problems, this paper proposes a connector structure for self-pressurizing nitrogen insulated cast busbar. The ends of the busbar body are relatively connected to each other through the connector. A connecting protective shell is provided on the outside of the connector. The connector protective shell includes a cover plate, a side plate, a silicone ring and a silicone pad. The silicone ring is arranged on the outside of the end of the busbar body. Side plates are provided on the front and rear sides of the silicone ring. Cover plates are provided on the upper and lower sides of the silicone ring. Silicone pads are provided on the inside of the cover plate. A pressure-maintaining valve is penetrated through the central surface of the cover plate. The front and rear bottom sides of the cover plate are respectively connected to the edge of the side plate. The inner left and right sides of the side plate are vertically provided with sealing edges. The surface of the sealing edge is pressed and fitted with the silicone ring. The upper and lower ends of the sealing edge are connected to the cover plate by bolts. By using the sealing effect, the interior of the connector is absolutely sealed, so that nitrogen can be poured into the interior, which meets the on-site pouring-free installation construction, solves the problem of on-site pouring of the cast busbar, and achieves the connector non-casting cast busbar, which is convenient for later maintenance, on-site installation and maintenance.

[0006] The busbar body is a rectangular strip-type cast busbar, a number of busbars are arranged in parallel inside the busbar body, a number of silicone rings are arranged in parallel on the outer circumference of the end of the busbar body, and the silicone rings are embedded on the outer side of the end of the busbar body. The busbars that are connected to each other at the ends of the busbar body are connected to each other through connectors. A special-shaped casting mold is used at the end of the busbar trough to ensure that casting material extends out of the copper busbar port. At the same time, a stab-type insulating partition is used to increase the creepage distance to ensure that the electrical insulation performance requirements are met even if the joint is not cast.

[0007] The connector is a bolt-compression connector. Several insulating partitions are arranged in parallel in the middle of the connector. Compression plates are arranged on the outside of both sides of the connector. A locking bolt is passed through the center of the compression plate. The locking bolts pass through the center of the insulating partition. Busbar ends are arranged between the insulating partitions. The entire connector adopts multiple sealing technologies, including corrosion-resistant silicone rubber, heat-resistant and cold-resistant sealant, high-strength composite aluminum pressure plate and other accessories to work together to meet the on-site pouring-free installation and construction requirements.

[0008] The silicone ring is an integrated annular ring, and the silicone ring is embedded in the outer surface of the end of the busbar body. Several silicone rings are arranged in parallel. The cover plate is in the shape of a rectangular cover, and the front and rear sides of the cover plate are provided with vertical folding edges. The inner side of the bottom surface of the cover plate is provided with a silicone pad. The central surface of the cover plate and the silicone pad is provided with air holes through the cover plate and the four corner surfaces of the cover plate and the silicone pad are provided with connecting holes through the cover plate. The inner side of the air hole is provided with a pressure-maintaining valve, and the connecting holes are connected to the sealing edge end of the side plate through bolts. The side plate is in the shape of a rectangular side plate, and the inner sides of the side plate are vertically provided with sealing edges. The sealing edges are connected to the side plate in an integrated manner. The sealing edges are rectangular columns of profile type, and the width of the sealing edges is greater than the spacing between the two sides of the parallel silicone rings. The centers of the two ends of the sealing edges are provided with threaded holes. After completing the leak detection process, 1.2 bar high-purity nitrogen with a purity of more than 99.5% is filled into the connector. With the help of nitrogen, it has better anti-puncture ability, lower thermal expansion coefficient, and no corrosion to the conductor insulation parts. The connector is fully protected in an all-round state. After normal power-on, the internal nitrogen will be in a micro-positive pressure self-maintaining state for a long time, ensuring that external water vapor cannot enter the connector and preventing the connector from being damp and condensed.

[0009] A sealing cover is provided at the outer end of the pressure-maintaining valve, and a sealant is provided on the inner side of the sealing cover. The outer sides of the silicone ring and the silicone pad are sealed with the cover plate and the side plate through the sealant. After all the processes are completed, the sealing cover is coated with glue to seal the air nozzle to prevent the air nozzle from being damaged and leaking.

[0010] Beneficial effects:

[0011] The bus duct ends use special-shaped casting molds to ensure that casting material extends out of the copper busbar port. At the same time, stab-type insulating partitions are used to increase the creepage distance to ensure that the electrical insulation performance requirements are met even if the joints are not cast.

[0012] The entire connector adopts multiple sealing technologies, including corrosion-resistant silicone rubber, heat-resistant and cold-resistant sealants, high-strength composite aluminum pressure plates and other accessories to work together to meet the requirements of on-site pouring-free installation and construction.

[0013] After the connector is connected on site and covered with sealing pressure plates on all sides, a vacuum leak detection process is performed from the air port on the cover to ensure that the air tightness of the entire structure meets the IP68 requirement.

[0014] After the leak detection process is completed, 1.2 bar high-purity nitrogen with a purity of more than 99.5% is filled into the connector. Nitrogen has better anti-puncture ability, lower thermal expansion coefficient, and no corrosion to conductor insulation parts. The connector is completely in an all-round protection state. After normal power-on, the internal nitrogen will be in a micro-positive pressure self-maintaining state for a long time, ensuring that external water vapor cannot enter the connector and prevent the connector from being damp and condensed.

[0015] After all the processes are completed, use a sealing cover to apply glue to seal the air nozzle to prevent it from being damaged or leaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a connection explosion diagram of a connector structure for a self-pressurized nitrogen-insulated cast busbar;

[0017] Figure 2 It is a schematic diagram of a busbar end of a connector structure for a self-pressurized nitrogen-insulated cast busbar;

[0018] Figure 3 It is an internal top view of a connector structure for a self-pressurized nitrogen-insulated cast busbar;

[0019] In the figure; 1. busbar body, 2. silicone ring, 3. busbar, 4. insulating partition, 5. connector, 6. cover plate, 7. silicone pad, 8. side panel. DETAILED DESCRIPTION

[0020] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0021] Busbar body 1, silicone ring 2, busbar 3, insulating partition 4, connector 5, cover plate 6, silicone pad 7, side plate 8.

[0022] like Figure 1 , 2, as shown in 3;

[0023] A connector structure for a self-pressurizing nitrogen insulated casting busbar, the ends of the busbar body 1 are relatively connected to each other through a connector 5, and a connection protection shell is provided on the outside of the connector 5. The connector 5 protection shell includes a cover plate 6, a side plate 8, a silicone ring 2 and a silicone pad 7. The silicone ring 2 is arranged on the outside of the end of the busbar body 1, and the front and rear sides of the silicone ring 2 are provided with side plates 8, and the upper and lower sides of the silicone ring 2 are provided with a cover plate 6. The inner side of the cover plate 6 is provided with a silicone pad 7, and a pressure-maintaining valve is provided through the central surface of the cover plate 6. The front and rear bottom sides of the cover plate 6 are respectively connected to the edges of the side plate. The inner left and right sides of the side plate 8 are vertically provided with sealing edges, the surface of the sealing edges and the silicone ring 2 are pressed and fitted against each other, and the upper and lower ends of the sealing edges are connected to the cover plate 6 by bolts. The busbar body 1 is a rectangular strip-type cast busbar, and a plurality of busbars 3 are arranged in parallel inside the busbar body 1. A plurality of silicone rings 2 are arranged in parallel on the outer side of the end of the busbar body 1. The silicone ring 2 is embedded in the outer side of the end of the busbar body 1. The busbars 3 at the ends of the busbar body 1 are connected to each other by connectors 5. The connector 5 is a bolt-tightening connector 5, and the middle of the connector 5 is arranged in parallel. There are several insulating partitions 4, and clamping plates are provided on the outside of both sides of the connector 5. A locking bolt is provided through the center of the clamping plate, and the locking bolts all pass through the center of the insulating partition 4. The ends of the busbar 3 are provided between the insulating partitions 4. The silicone ring 2 is an integrated annular ring, and the silicone ring 2 is embedded in the outer surface of the end of the busbar body 1. Several silicone rings 2 are provided in parallel. The cover plate 6 is in the shape of a rectangular cover, and the front and rear sides of the cover plate 6 are provided with vertical folding edges. A silicone pad 7 is provided on the inner side of the bottom surface of the cover plate 6. The central surface of the cover plate 6 and the silicone pad 7 is provided with air holes, and the four corners of the cover plate 6 and the silicone pad 7 A connecting hole is provided through the surface, and a pressure-maintaining valve is provided on the inner side of the air hole. The connecting holes are connected to the sealing edge ends of the side panels 8 by bolts. The side panels 8 are in the shape of a rectangular side panel, and sealing edges are provided vertically on both inner sides of the side panels 8. The sealing edges are connected to the side panels 8 in an integrated manner, and the sealing edges are profile-type rectangular columns. The width of the sealing edges is greater than the spacing between the two sides of several parallel silicone rings 2. Threaded holes are provided at the centers of both ends of the sealing edges. A sealing cover is provided at the outer end of the pressure-maintaining valve, and a sealant is provided on the inner side of the sealing cover. The outer sides of the silicone ring 2 and the silicone pad 7 are sealed and connected to the cover plate 6 and the side panel through sealant.

[0024] Implementation examples;

[0025] First, the connector 5 is connected on site by using the force-pressed seal of silicone rubber and flat sealant, and then the sealing pressure plates on all sides are covered. Then, a vacuum leak detection process is performed from the air port on the cover plate 6, and then a vacuum leak detection test is performed. Finally, after the leak detection process is completed, 1.2 bar high-purity nitrogen with a purity of more than 99.5% is filled into the connector 5, and the high-purity nitrogen is filled to achieve the casting-free connector 5.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A connector structure for a self-pressurizing nitrogen insulated casting busbar, the ends of the busbar body are relatively connected to each other through the connector, and a connection protection shell is provided on the outside of the connector, characterized in that: The connector protective shell includes a cover plate, a side plate, a silicone ring and a silicone pad. The silicone ring is arranged on the outside of the end of the busbar body, the front and rear sides of the silicone ring are provided with side plates, the upper and lower sides of the silicone ring are provided with cover plates, the inner side of the cover plate is provided with silicone pads, and a pressure-maintaining valve is penetrated through the central surface of the cover plate. The front and rear bottom sides of the cover plate are respectively connected to the edges of the side plates. The inner left and right sides of the side plates are vertically provided with sealing edges. The surface of the sealing edge is squeezed and fitted with the silicone ring, and the upper and lower ends of the sealing edge are connected to the cover plate by bolts.

2. A connector structure for a self-pressurizing nitrogen insulated cast busbar according to claim 1, characterized in that: The busbar body is a rectangular strip-type cast busbar, a plurality of busbars are arranged in parallel inside the busbar body, a plurality of silicone rings are arranged in parallel on the outer circumference of the end of the busbar body, the silicone rings are embedded on the outer side of the end of the busbar body, and the busbars connected to each other at the ends of the busbar body are connected to each other through connectors.

3. A connector structure for a self-pressurized nitrogen insulated cast busbar according to claim 1, characterized in that: The connector is a bolt-clamped connector, and a plurality of insulating partitions are arranged in parallel in the middle of the connector, and clamping plates are arranged on the outside of both sides of the connector. A locking bolt is arranged through the center of the clamping plate, and the locking bolts all pass through the center of the insulating partition, and busbar ends are arranged between the insulating partitions.

4. A connector structure for a self-pressurizing nitrogen insulated cast busbar according to claim 1, characterized in that: The silicone ring is an integrated annular ring, which is embedded on the outer surface of the end of the busbar body, and a plurality of silicone rings are arranged in parallel.

5. A connector structure for a self-pressurized nitrogen insulated cast busbar according to claim 1, characterized in that: The cover plate is in the shape of a rectangular cover, and both the front and rear sides of the cover plate are provided with vertical folded edges. A silicone pad is provided on the inner side of the bottom surface of the cover plate. Air holes are provided on the central surfaces of the cover plate and the silicone pad, and connecting holes are provided on the four corner surfaces of the cover plate and the silicone pad. A pressure-maintaining valve is provided on the inner side of the air hole, and the connecting holes are connected to the sealing edge ends of the side plates through bolts.

6. A connector structure for a self-pressurized nitrogen insulated cast busbar according to claim 1, characterized in that: The side panel is in the shape of a rectangular side panel, and sealing edges are vertically provided on both inner sides of the side panel. The sealing edges are integrally connected to the side panel, and the sealing edges are profiled rectangular columns. The width of the sealing edges is greater than the spacing between the two sides of several parallel silicone rings, and threaded holes are provided at the centers of both ends of the sealing edges.

7. A connector structure for a self-pressurized nitrogen insulated cast busbar according to claim 1, characterized in that: The outer end of the pressure-maintaining valve is provided with a sealing cover, and the inner side of the sealing cover is provided with sealing glue.

8. A connector structure for a self-pressurized nitrogen insulated cast busbar according to claim 1, characterized in that: The outer sides of the silicone ring and the silicone pad are sealed and connected to the cover plate and the side plate through sealant.

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