Single box type circuit breaker switch

Abstract

The utility model relates to a single-box type circuit breaker switch, which comprises a mechanism frame, three solid-sealed polar poles, a circuit breaker main shaft, three groups of transmission cam assemblies, an isolation main shaft, three isolation knives and three grounding contacts, and each solid-sealed polar pole comprises an epoxy resin casting body, a vacuum arc-extinguishing chamber and a conductive copper piece. One end of the conductive copper piece extends out of the epoxy resin pouring body and is rotatably connected to one end of the isolation knife, the transmission cam assembly comprises a support, two transmission cams and a transmission plug pin, pulleys slidably arranged in sliding holes of the two transmission cams are arranged at the two ends of the transmission plug pin respectively, and one end of the support is rotatably arranged on a main shaft of the circuit breaker; the other end of the support is provided with four supporting legs distributed in a rectangular array mode, one end of the epoxy resin pouring body is provided with an insulation containing groove, and the four supporting legs are connected into the insulation containing groove through screws. The utility model has the advantages of simple structure, stable and reliable performance, good insulation performance and high assembly efficiency.

Description

Technical Field

[0001] The utility model relates to a circuit breaker switch, in particular to a single-box circuit breaker switch. Background Art

[0002] The ring main unit is a group of electrical transmission and distribution equipment installed in a metal or non-metallic insulating cabinet or made into an assembled interval ring main unit. It usually uses sulfur hexafluoride gas, environmentally friendly gas, or epoxy resin as an insulating medium. In view of the rapidly developing power industry, the use of environmentally friendly gas as an insulating medium will be an important trend in the future development of the switch industry. The advantage of the existing circuit breaker switch used in the environmentally friendly gas cabinet is its maintenance-free characteristics. The switch adopts a normal pressure sealed box structure, without the threat of gas leakage, and can effectively isolate the pollution of external dirt, dust, and acid mist, ensuring the cleanliness of the operating environment of its busbar, circuit breaker, isolation knife, and grounding knife and its service life, achieving the purpose of maintenance-free, thereby greatly reducing the investment in distribution network operation and maintenance management. The insulation performance of the circuit breaker switch in the existing single-box environmentally friendly gas cabinet is poor, the air creepage distance between the three vacuum interrupters and the three groups of cam assemblies is small, the phase-to-phase insulation performance is poor, and the safety is low. In addition, the circuit breaker switch also has the defects of complex structure, inconvenient assembly, and unreliable performance. Summary of the invention

[0003] The utility model aims to overcome the defects of the prior art and provide a single-box circuit breaker switch with simple structure, stable and reliable performance, good insulation performance and high assembly efficiency.

[0004] To achieve the above-mentioned purpose, the utility model adopts a single-box circuit breaker switch, including a mechanism frame, three sealed poles arranged on the mechanism frame, a circuit breaker main shaft rotatably arranged on the mechanism frame, three groups of transmission cam components that cooperate with the circuit breaker main shaft and are used to drive the three sealed poles to perform opening and closing, an isolation main shaft rotatably arranged on the mechanism frame, three isolation knives rotatably arranged on the three sealed poles and cooperate with the isolation main shaft, and three grounding contacts arranged on the mechanism frame and cooperate with the three isolation knives. The sealed pole includes an epoxy resin casting body, a vacuum interrupter arranged in the epoxy resin casting body, and a conductor arranged on one end of the vacuum interrupter. An electrically conductive copper part, wherein one end of the electrically conductive copper part extends outside the epoxy resin casting body and is rotatably connected to one end of the isolating knife. The transmission cam assembly comprises a bracket, two transmission cams arranged on the main shaft of the circuit breaker at both sides of the corresponding bracket, and a transmission pin linked to the pull rod at the other end of the vacuum arc extinguishing chamber. Both ends of the transmission pin are respectively provided with pulleys slidably arranged in the sliding holes of the two transmission cams. One end of the bracket is rotatably arranged on the main shaft of the circuit breaker, and the other end of the bracket has four supporting feet distributed in a rectangular array. One end of the epoxy resin casting body has an insulating accommodating groove, and the four supporting feet are connected to the insulating accommodating groove by screws.

[0005] The beneficial effects of the above structure are: the circuit breaker switch adopts a solid-sealed pole structure design, which is cast into an integrated structure through epoxy resin, with better insulation performance and more convenient assembly. The transmission cam assembly is arranged in the insulation accommodating groove of the solid-sealed pole, which can increase the air insulation distance between the three groups of transmission cam assemblies, and the phase-to-phase insulation performance is better. The bracket is fixed in the insulation accommodating groove by four supporting feet, which can ensure that the connection between the bracket and the epoxy resin casting body is more firm, and the phase-to-phase insulation performance between the three groups of transmission cam assemblies can be enhanced. Therefore, the circuit breaker switch has the advantages of simple structure, stable and reliable performance, good insulation performance, and high assembly efficiency.

[0006] In particular, a flexible connection is provided on the pull rod of the vacuum interrupter, one end of the flexible connection extends into the insulating groove of the epoxy resin casting body and is provided with a wiring hole, and a copper insert is provided in the insulating groove corresponding to the wiring hole. The flexible connection is provided in the insulating groove, which is conducive to improving the insulation performance of the circuit breaker switch.

[0007] In particular, an overtravel spring assembly is provided between the corresponding soft connection and the transmission pin on the pull rod, and the overtravel spring assembly includes a spring seat sleeved on the pull rod and coordinated with the transmission pin, a fixed seat sleeved on the pull rod and abutting on the soft connection, and an overtravel spring sleeved on the pull rod, and the two ends of the overtravel spring abut on the spring seat and the fixed seat respectively. The overtravel spring assembly can ensure that the circuit breaker switch can be reliably opened and closed, which is conducive to improving the working reliability of the circuit breaker switch.

[0008] In particular, the epoxy resin casting body is provided with a plurality of inserts at the mounting beams corresponding to the mechanism frame, and the mounting beams are provided with screws connected to the plurality of inserts. The sealed pole is connected to the mounting beams of the mechanism frame through the plurality of inserts, thereby facilitating the assembly of the sealed pole and the mechanism frame, and achieving higher assembly efficiency.

[0009] In particular, a plurality of insulating convex strips are respectively arranged on the outer wall of the epoxy resin casting body between the corresponding insert and the transmission cam assembly. The insulating convex strips can increase the creepage distance of the sealed pole, which is beneficial to improving the insulation performance of the sealed pole.

[0010] In particular, the main shaft of the circuit breaker is provided with interphase retaining rings for separating the three groups of transmission cam assemblies. The retaining rings can increase the air insulation distance of the three groups of transmission cam assemblies, thereby facilitating the improvement of the interphase insulation performance of the three groups of transmission cam assemblies. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a stereogram of an embodiment of the utility model.

[0012] Figure 2 It is a cross-sectional view of an embodiment of the utility model.

[0013] Figure 3 It is the front view of the embodiment of the utility model. DETAILED DESCRIPTION

[0014] like Figures 1 to 3As shown, the embodiment of the utility model is a single-box circuit breaker switch, including a mechanism frame 10, three sealed poles 11 arranged on the mechanism frame 10, a circuit breaker main shaft 12 rotatably arranged on the mechanism frame 10, three groups of transmission cam components 13 that cooperate with the circuit breaker main shaft 12 and are used to drive the three sealed poles 11 to perform opening and closing, an isolation main shaft 14 rotatably arranged on the mechanism frame 10, three isolation knives 15 rotatably arranged on the three sealed poles 11 and cooperate with the isolation main shaft 14, and three grounding contacts 16 arranged on the mechanism frame 10 and cooperate with the three isolation knives 15. The sealed pole 11 includes an epoxy resin casting body 111, a vacuum arc extinguishing chamber 112 arranged in the epoxy resin casting body 111, and a conductive copper piece 113 arranged on one end of the vacuum arc extinguishing chamber 112. The conductive copper piece 11 3 extends outside the epoxy resin casting body 11 and is rotatably connected to one end of the isolation knife 15. The transmission cam assembly 13 includes a bracket 131, two transmission cams 132 arranged on the circuit breaker main shaft 12 at both sides of the corresponding bracket 13, and a transmission latch 133 linked to the pull rod 1121 at the other end of the vacuum interrupter 112. The two ends of the transmission latch 133 are respectively provided with pulleys 134 slidably arranged in the sliding holes 1321 of the two transmission cams 132. One end of the bracket 131 is rotatably set on the circuit breaker main shaft 12, and the other end of the bracket 131 has four supporting feet 1311 distributed in a rectangular array. One end of the epoxy resin casting body 111 has an insulating accommodating groove 114, and the four supporting feet 1311 are connected to the insulating accommodating groove 114 through screws 115. A flexible connection 116 is provided on the pull rod 1121 of the vacuum interrupter 112, one end of which extends into the insulating accommodating groove 114 of the epoxy resin casting body 111 and is provided with a wiring hole 1161, and a copper insert 117 is provided in the insulating accommodating groove 114 corresponding to the wiring hole 1161. The flexible connection is provided in the insulating accommodating groove, which is conducive to improving the insulation performance of the circuit breaker switch.

[0015] like Figure 2 and 3As shown, an overtravel spring assembly 20 is arranged between the corresponding soft connection 116 and the transmission latch 133 on the pull rod 1121, and the overtravel spring assembly 20 includes a spring seat 21 which is sleeved on the pull rod 1121 and cooperates with the transmission latch 133, a fixed seat 22 which is sleeved on the pull rod 1121 and abuts on the soft connection 116, and an overtravel spring 23 which is sleeved on the pull rod 1121, and the two ends of the overtravel spring 23 abut on the spring seat 21 and the fixed seat 22 respectively. The overtravel spring assembly can ensure that the circuit breaker switch can be reliably opened and closed, which is conducive to improving the working reliability of the circuit breaker switch. A plurality of inserts 118 are respectively arranged on the epoxy resin casting body 111 at the corresponding mounting beam 101 of the frame 10, and screws 119 connected to the plurality of inserts 118 are respectively arranged on the mounting beam 101. The sealed pole is connected to the mounting beam of the mechanism frame through a plurality of inserts, thereby facilitating the assembly of the sealed pole and the mechanism frame and improving the assembly efficiency.

[0016] like Figure 1 As shown, a plurality of insulating ridges 1111 are respectively arranged on the outer wall of the epoxy resin casting body 111 between the corresponding insert 118 and the transmission cam assembly 13. The insulating ridges can increase the creepage distance of the sealed pole, which is beneficial to improving the insulation performance of the sealed pole. The circuit breaker main shaft 12 is respectively provided with interphase retaining rings 121 separating the three groups of transmission cam assemblies 13. The retaining rings can increase the air insulation spacing of the three groups of transmission cam assemblies, thereby helping to improve the interphase insulation performance of the three groups of transmission cam assemblies.

[0017] The circuit breaker switch adopts a solid-sealed pole structure design, which is cast into an integrated structure through epoxy resin, with better insulation performance and more convenient assembly. The transmission cam assembly is arranged in the insulation accommodating groove of the solid-sealed pole, which can increase the air insulation distance between the three groups of transmission cam assemblies, and the phase-to-phase insulation performance is better. The bracket is fixed in the insulation accommodating groove through four supporting feet, which can ensure that the connection between the bracket and the epoxy resin casting body is more firm, and the phase-to-phase insulation performance between the three groups of transmission cam assemblies can be enhanced. Therefore, the circuit breaker switch has the advantages of simple structure, stable and reliable performance, good insulation performance, and high assembly efficiency.

Claims

1. A single-box circuit breaker switch, characterized in that: The invention comprises a mechanism frame, three sealed poles arranged on the mechanism frame, a circuit breaker main shaft rotatably arranged on the mechanism frame, three groups of transmission cam components which cooperate with the circuit breaker main shaft and are used to drive the three sealed poles to perform opening and closing, an isolation main shaft rotatably arranged on the mechanism frame, three isolation knives which are rotatably arranged on the three sealed poles and cooperate with the isolation main shaft, and three grounding contacts which are arranged on the mechanism frame and cooperate with the three isolation knives. The sealed pole comprises an epoxy resin casting body, a vacuum arc extinguishing chamber arranged in the epoxy resin casting body, and a conductive copper piece arranged on one end of the vacuum arc extinguishing chamber. One end of the conductive copper piece Extending outside the epoxy resin casting body and rotatably connected to one end of the isolating knife, the transmission cam assembly includes a bracket, two transmission cams arranged on the main shaft of the circuit breaker at both sides of the corresponding bracket, and a transmission pin linked to the pull rod at the other end of the vacuum arc extinguishing chamber. Both ends of the transmission pin are respectively provided with pulleys slidably arranged in the sliding holes of the two transmission cams. One end of the bracket is rotatably set on the main shaft of the circuit breaker, and the other end of the bracket has four supporting feet distributed in a rectangular array. One end of the epoxy resin casting body has an insulating accommodating groove, and the four supporting feet are connected to the insulating accommodating groove by screws.

2. The single-box circuit breaker switch according to claim 1, characterized in that: A flexible connection is arranged on the pull rod of the vacuum interrupter, one end of which extends into the insulating accommodating groove of the epoxy resin casting body and is provided with a wiring hole, and a copper insert is arranged in the insulating accommodating groove at a position corresponding to the wiring hole.

3. The single-box circuit breaker switch according to claim 2, characterized in that: An overtravel spring assembly is arranged between the corresponding soft connection and the transmission pin on the pull rod. The overtravel spring assembly includes a spring seat which is sleeved on the pull rod and cooperates with the transmission pin, a fixed seat which is sleeved on the pull rod and abuts against the soft connection, and an overtravel spring which is sleeved on the pull rod. The two ends of the overtravel spring respectively abut against the spring seat and the fixed seat.

4. The single-box circuit breaker switch according to claim 1 or 2, characterized in that: A plurality of inserts are respectively arranged on the epoxy resin casting body at the mounting beams corresponding to the machine frame, and screws connected with the plurality of inserts are respectively arranged on the mounting beams.

5. The single-box circuit breaker switch according to claim 4, characterized in that: A plurality of insulating convex strips are respectively arranged on the outer wall of the epoxy resin casting body between the corresponding inserts and the transmission cam assembly.

6. The single-box circuit breaker switch according to claim 1 or 2, characterized in that: Interphase retaining rings for separating the three groups of transmission cam components are respectively arranged on the main shaft of the circuit breaker.

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