Connecting rod type lower isolation circuit breaker switch

Abstract

The utility model relates to a connecting rod type lower isolation circuit breaker switch, which comprises a mechanism frame, a circuit breaker assembly and an isolation switch assembly, the circuit breaker assembly comprises a solid-sealed polar pole, three cam fixing seats, a main shaft and three groups of transmission cam assemblies, and the solid-sealed polar pole is provided with insulation accommodating grooves corresponding to the three cam fixing seats respectively. The other ends of the cam fixing seats are connected into the insulation containing grooves, the main shaft is provided with phase-to-phase insulation check rings arranged among the three cam fixing seats in a separated mode, the transmission cam assembly comprises two cams, a linkage shaft and two idler wheels, and the two cams are provided with guide holes matched with the two idler wheels respectively. A pull rod of the vacuum arc-extinguishing chamber is provided with a flexible connector, the pull rod is provided with a spring seat abutting against the flexible connector, the pull rod is sleeved with a pull cap in linkage fit with the linkage shaft, the pull rod is sleeved with an over-travel spring, and the two ends of the over-travel spring abut against the spring seat and the pull cap respectively. The utility model has the advantages of simple structure, stable and reliable performance, and good insulation performance.

Description

Technical Field

[0001] The utility model specifically relates to a connecting rod type lower isolating 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 creepage distance between the three cam fixing seats of the existing circuit breaker switch is small, the phase-to-phase insulation performance is poor, there are major safety hazards, the safety is low, and the three groups of cam components cannot reliably drive the three vacuum interrupters to perform the opening and closing actions, and the mechanical characteristics are unreliable. In addition, the connection between the three cam fixing seats and the sealed pole is not compact, resulting in low strength. Furthermore, the circuit breaker switch has the defects of complex structure, complicated assembly and unreliable performance. Summary of the invention

[0003] The utility model aims to overcome the defects of the prior art and provide a connecting rod type lower isolating 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 connecting rod type lower isolating circuit breaker switch, including a mechanism frame, a circuit breaker assembly arranged on the mechanism frame, and an isolating switch assembly arranged on the mechanism frame. The circuit breaker assembly includes a sealed pole arranged on the mechanism frame, three cam fixing seats arranged on the sealed pole, a main shaft rotatably arranged on one end of the three cam fixing seats, and three groups of transmission cam assemblies that cooperate with the main shaft and are used to drive three vacuum arc extinguishing chambers of the sealed pole to perform opening and closing actions. Insulating accommodating grooves are respectively arranged at the corresponding three cam fixing seats on the sealed pole, and the other end of the cam fixing seat is connected to the insulating accommodating groove. The main shaft is respectively provided with interphase insulating retaining rings separated between three cam fixing seats, the transmission cam assembly includes two cams which cooperate with the main shaft, a linkage shaft arranged on the pull rod of the vacuum arc extinguishing chamber, and two rollers which are arranged on the linkage shaft and cooperate with the two cams. The two cams are respectively provided with guide holes which cooperate with the two rollers, the pull rod of the vacuum arc extinguishing chamber is provided with a soft connection, the pull rod is provided with a spring seat which abuts against the soft connection, the pull rod is provided with a pull cap which cooperates with the linkage shaft, the pull rod is provided with an overtravel spring, and the two ends of the overtravel spring are respectively abutted in the spring seat and the pull cap.

[0005] The beneficial effects of the above structure are: the cam fixing seat and the sealed pole are fixed by upper and lower assembly, which makes assembly more convenient, and the cam fixing seat is fixed in the insulating accommodating groove of the sealed pole, and the interphase insulating retaining ring is separated between the three cam fixing seats, thereby increasing the three-phase insulation distance, improving the interphase insulation performance, and increasing safety. The pull rod of the vacuum arc extinguishing chamber is provided with a spring seat and a pull cap that match the overtravel spring, and the overtravel spring is contained in the spring seat and the pull cap, which can ensure that the elasticity of the overtravel spring is more stable and the mechanical characteristics are more reliable, so that the transmission cam assembly can reliably drive the vacuum arc extinguishing chamber to perform the opening and closing action through the linkage shaft. Therefore, the lower isolating circuit breaker switch has the advantages of simple structure, stable and reliable performance, good insulation performance, and high assembly efficiency.

[0006] In particular, the isolating switch assembly includes three static contacts arranged on the sealed pole and electrically connected to the three vacuum arc extinguishing chambers, three contact seats arranged on the fixed frame of the mechanism frame, three moving contacts rotatably arranged on the three contact seats, an isolating shaft arranged on the mechanism frame, three groups of crank arm assemblies linked to the isolating shaft and used to drive the three moving contacts to move, and a grounding contact assembly arranged on the mechanism frame and matched with the three moving contacts. The crank arm assembly includes a crank arm linked to the isolating shaft, a cam member arranged on the moving contact, and two connecting rods connected between the cam member and the crank arm. A pad is arranged on one end of the static contact, and a buffer pad matched with the moving contact is arranged between the pad and the static contact. The rotating shaft drives the three moving contacts to perform the opening and closing actions through the three groups of crank arm assemblies, thereby ensuring the synchronization of the actions of the three moving contacts, and the buffer pad plays a buffering role on the moving contacts, which can ensure that the moving contacts and the static contacts can be reliably in contact.

[0007] In particular, a bolt connected to the vacuum interrupter is provided on one end of the static contact, and two limiting protrusions are provided on both sides of the solid-sealed pole corresponding to the other end of the static contact, and the two limiting protrusions abut against both sides of the static contact, and constitute a limiting match between the static contact and the two limiting protrusions. The two limiting protrusions of the solid-sealed pole limit the static contact, and the connection between the static contact and the solid-sealed pole and the vacuum interrupter is more compact, which can prevent the static contact from tilting, and is conducive to improving the contact reliability between the static contact and the moving contact.

[0008] In particular, the grounding contact assembly includes a support plate arranged on the mechanism frame, a grounding conductive plate arranged on the support plate, and three grounding contacts respectively arranged on the grounding conductive plates, one end of the grounding conductive plate is provided with a lap hole, and a lap clearance hole is provided on the wall plate of the mechanism frame at a position corresponding to the lap hole. A lap hole is provided on one end of the grounding conductive plate, so as to facilitate the grounding lap of multiple circuit breakers, and a lap clearance hole is provided on the wall plate, so that a copper bar can be passed through the lap clearance hole to lap the grounding conductive plate, so as to achieve multi-directional lap, facilitate on-site construction, and help improve on-site construction efficiency.

[0009] In particular, the grounding contact is in a T-shape, a buffer pad is provided on the support plate at a position corresponding to the grounding contact, a positioning groove is provided on the buffer pad, one side of the grounding contact is engaged in the positioning groove, and a clamping fit between the grounding contact and the buffer pad is formed. The grounding contact adopts a T-shaped structural design, and the buffer pad plays a buffering role on the moving contact, thereby ensuring that the contact between the grounding contact and the moving contact is more reliable, which is conducive to improving the working reliability of the lower isolating circuit breaker switch.

[0010] In particular, the insulating groove is provided with slots on both sides, and one end of the flexible connection has a wiring hole that passes through the slot and is exposed outside the sealed pole. The flexible connection is arranged in the insulating groove, thereby improving the three-phase insulation performance. The flexible connection is led out from the slot, and can be led out on one side or both sides according to user needs, making the construction more flexible and the wiring more convenient.

[0011] In particular, the other end of the cam fixing seat is provided with four fixing holes, the insulating accommodating groove is provided with four fixing bosses corresponding to the four fixing holes, and the four fixing holes are respectively provided with screws connected to the four fixing bosses. The cam fixing seat is fixed in the insulating accommodating groove of the sealed pole by the four screws, thereby ensuring that the connection between the cam fixing seat and the sealed pole is more compact and firm, and the mechanical characteristics are more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a stereoscopic diagram of an embodiment of the utility model from a first viewing angle.

[0013] Figure 2 This is a stereoscopic diagram of an embodiment of the utility model from a first viewing angle.

[0014] Figure 3 It is a cross-sectional view of an embodiment of the utility model.

[0015] Figure 4 It is a three-dimensional diagram of the transmission cam assembly according to an embodiment of the utility model.

[0016] Figure 5 It is a three-dimensional diagram of a ground contact assembly according to an embodiment of the utility model. DETAILED DESCRIPTION

[0017] like Figures 1 to 5As shown, the embodiment of the utility model is a connecting rod type lower isolating circuit breaker switch, including a mechanism frame 10, a circuit breaker assembly 20 arranged on the mechanism frame 10, and an isolating switch assembly 30 arranged on the mechanism frame 10, wherein the circuit breaker assembly 20 includes a sealed pole 21 arranged on the mechanism frame 10, three cam fixing seats 22 arranged on the sealed pole 21, a main shaft 23 rotatably arranged on one end of the three cam fixing seats 22, and three groups of transmission cam assemblies 24 that cooperate with the main shaft 23 and are used to drive three vacuum arc extinguishing chambers 211 of the sealed pole 21 to perform opening and closing actions, and the sealed pole 21 is respectively provided with insulating accommodating grooves 210 at the corresponding three cam fixing seats 22, and the other end of the cam fixing seat 22 is connected to the insulating accommodating groove 210, and the main shaft 23 is respectively provided with three cam fixing seats 22 separated from each other. An interphase insulating retaining ring 25 is provided between the fixed seats 22, and the transmission cam assembly 24 includes two cams 241 that cooperate with the main shaft 23, a linkage shaft 242 arranged on the pull rod 2111 of the vacuum arc extinguishing chamber 211, and two rollers 243 arranged on the linkage shaft 242 and cooperate with the two cams 241. The two cams 241 are respectively provided with guide holes 2411 that cooperate with the two rollers 243. A soft connection 26 is provided on the pull rod 2111 of the vacuum arc extinguishing chamber 211, and a spring seat 27 that abuts against the soft connection 26 is provided on the pull rod 2111. A pull cap 28 that cooperates with the linkage shaft 242 is installed on the pull rod 2111. An overtravel spring 29 is installed on the pull rod 2111, and the two ends of the overtravel spring 29 are respectively abutted in the spring seat 27 and the pull cap 28. The insulating groove 210 is provided with slots 2101 on both sides, and one end of the flexible connection 26 has a wiring hole 261 that passes through the slot 2101 and is exposed outside the sealed pole 21. The flexible connection is arranged in the insulating groove, so as to improve the three-phase insulation performance. The flexible connection is led out from the slot, and can be led out on one side or both sides according to user needs, so that the construction is more flexible and the wiring is more convenient. The cam fixing seat 22 is provided with four fixing holes on the other end, and four fixing bosses 2102 are provided at the corresponding positions of the four fixing holes in the insulating groove 210, and screws 221 connected to the four fixing bosses 2102 are respectively provided in the four fixing holes. The cam fixing seat is fixed in the insulating groove of the sealed pole by four screws, so as to ensure that the connection between the cam fixing seat and the sealed pole is more compact and firm, and the mechanical properties are more reliable.

[0018] like Figure 1 and 2As shown, the isolating switch assembly 30 includes three static contacts 31 arranged on the sealed pole 21 and electrically connected to the three vacuum arc extinguishing chambers 211, three contact seats 32 arranged on the fixed frame 101 of the mechanism frame 10, three moving contacts 33 rotatably arranged on the three contact seats 32, an isolating shaft 34 arranged on the mechanism frame 10, three groups of crank arm assemblies 35 linked to the isolating shaft 34 and used to drive the three moving contacts 33 to move, and a grounding contact assembly 36 arranged on the mechanism frame 10 and matched with the three moving contacts 33. The crank arm assembly 35 includes a crank arm 351 linked to the isolating shaft 34, a cam member 352 arranged on the moving contact 33, and two connecting rods 353 connected between the cam member 352 and the crank arm 351. A pad 37 is arranged on one end of the static contact 31, and a buffer pad 38 matching the moving contact 33 is arranged between the pad 37 and the static contact 31. The rotating shaft drives three moving contacts to perform the opening and closing actions through three groups of crank arm assemblies, thereby ensuring the synchronization of the actions of the three moving contacts, and the buffer pad plays a buffering role on the moving contact, which can ensure that the moving contact and the static contact can be reliably in contact. A bolt 311 connected to the vacuum arc extinguishing chamber 211 is provided on one end of the static contact 31, and two limiting protrusions 212 are provided on both sides of the other end of the static contact 31 on the sealed pole 21. The two limiting protrusions 212 abut on both sides of the static contact 31 and constitute a limiting fit between the static contact 31 and the two limiting protrusions 212. The two limiting protrusions of the sealed pole play a limiting role on the static contact, and the connection between the static contact and the sealed pole and the vacuum arc extinguishing chamber is more compact, which can prevent the static contact from tilting, and is conducive to improving the contact reliability between the static contact and the moving contact.

[0019] like Figure 1 and 4As shown, the grounding contact assembly 36 comprises a support plate 361 arranged on the mechanism frame 10, a grounding conductive plate 362 arranged on the support plate 361, and three grounding contacts 363 respectively arranged on the grounding conductive plate 362. A lap hole 3621 is arranged at one end of the grounding conductive plate 362, and a lap clearance hole 1021 is arranged at a position corresponding to the lap hole 3621 on the wall plate 102 of the mechanism frame 10. A lap hole is arranged on one end of the grounding conductive plate, so as to facilitate the grounding lap of multiple circuit breakers and switches, and a lap clearance hole is arranged on the wall plate, so that a copper bar can be passed through the lap clearance hole to lap the grounding conductive plate, so as to achieve multi-directional lap, facilitate on-site construction, and help improve on-site construction efficiency. The grounding contact 363 is in a T-shape, and a buffer pad 364 is provided on the support plate 361 at a position corresponding to the grounding contact 363. A positioning groove 3641 is provided on the buffer pad 364. One side of the grounding contact 363 is engaged in the positioning groove 3641, and the grounding contact 363 and the buffer pad 364 are engaged with each other. The grounding contact adopts a T-shaped structure design, and the buffer pad plays a buffering role on the moving contact, thereby ensuring that the contact between the grounding contact and the moving contact is more reliable, which is conducive to improving the working reliability of the lower isolating circuit breaker switch.

[0020] The cam fixing seat and the sealed pole are fixed by upper and lower assembly, which is more convenient to assemble. The cam fixing seat is fixed in the insulating accommodating groove of the sealed pole, and the interphase insulating retaining ring is separated between the three cam fixing seats, so that the three-phase insulation distance can be increased, the interphase insulation performance is better, and the safety is higher. The pull rod of the vacuum arc chamber is provided with a spring seat and a pull cap matched with the overtravel spring. The overtravel spring is contained in the spring seat and the pull cap, which can ensure that the elasticity of the overtravel spring is more stable and the mechanical characteristics are more reliable, so that the transmission cam assembly can reliably drive the vacuum arc chamber to perform the opening and closing action through the linkage shaft. Therefore, the lower isolating circuit breaker switch has the advantages of simple structure, stable and reliable performance, good insulation performance, and high assembly efficiency.

Claims

1. A connecting rod type lower isolating circuit breaker switch, characterized in that: The invention comprises a mechanism frame, a circuit breaker assembly arranged on the mechanism frame, and an isolating switch assembly arranged on the mechanism frame. The circuit breaker assembly comprises a sealed pole arranged on the mechanism frame, three cam fixing seats arranged on the sealed pole, a main shaft arranged on one end of the three cam fixing seats, and three groups of transmission cam assemblies which are linked with the main shaft and used to drive three vacuum arc extinguishing chambers of the sealed pole to perform opening and closing actions. The sealed pole is respectively provided with insulating accommodating grooves at the positions corresponding to the three cam fixing seats, and the other end of the cam fixing seat is connected to the insulating accommodating groove. The main shaft is respectively provided with insulating accommodating grooves separated at three positions. An interphase insulating retaining ring between the cam fixing seats, the transmission cam assembly includes two cams that cooperate with the main shaft, a linkage shaft arranged on the pull rod of the vacuum arc extinguishing chamber, and two rollers arranged on the linkage shaft and cooperate with the two cams. The two cams are respectively provided with guide holes that cooperate with the two rollers. The pull rod of the vacuum arc extinguishing chamber is provided with a soft connection, and the pull rod is provided with a spring seat that abuts against the soft connection. The pull rod is provided with a pull cap that cooperates with the linkage shaft, and the pull rod is provided with an overtravel spring, and the two ends of the overtravel spring are respectively abutted in the spring seat and the pull cap.

2. The connecting rod type lower isolating circuit breaker switch according to claim 1, characterized in that: The isolating switch assembly includes three static contacts arranged on the sealed pole and electrically connected to the three vacuum arc extinguishing chambers, three contact seats arranged on the fixed frame of the mechanism frame, three moving contacts rotatably arranged on the three contact seats, an isolating shaft arranged on the mechanism frame, three groups of crank arm assemblies linked to the isolating shaft and used to drive the three moving contacts to move, and a grounding contact assembly arranged on the mechanism frame and matched with the three moving contacts. The crank arm assembly includes a crank arm linked to the isolating shaft, a cam member arranged on the moving contact, and two connecting rods connected between the cam member and the crank arm. A pad is arranged on one end of the static contact, and a buffer pad matching the moving contact is arranged between the pad and the static contact.

3. The connecting rod type lower isolating circuit breaker switch according to claim 2, characterized in that: A bolt connected to the vacuum arc extinguishing chamber is arranged on one end of the static contact, and two limiting protrusions are arranged on both sides of the other end of the static contact on the sealed pole. The two limiting protrusions abut against the two sides of the static contact and constitute a limiting fit between the static contact and the two limiting protrusions.

4. The connecting rod type lower isolating circuit breaker switch according to claim 2, characterized in that: The grounding contact assembly includes a support plate arranged on the mechanism frame, a grounding conductive plate arranged on the support plate, and three grounding contacts respectively arranged on the grounding conductive plate. A lap hole is arranged at one end of the grounding conductive plate, and a lap clearance hole is arranged on the wall plate of the mechanism frame at a position corresponding to the lap hole.

5. The connecting rod type lower disconnecting circuit breaker switch according to claim 4, characterized in that: The grounding contact is T-shaped, a buffer pad is provided on the support plate at a position corresponding to the grounding contact, a positioning groove is provided on the buffer pad, one side of the grounding contact is engaged in the positioning groove, and a snap-fitting fit between the grounding contact and the buffer pad is formed.

6. The connecting rod type lower disconnecting circuit breaker switch according to claim 1 or 2, characterized in that: Slots are respectively arranged on both sides of the insulating accommodating groove, and one end of the flexible connection has a wiring hole passing through the slot and exposed outside the sealed pole.

7. The connecting rod type lower disconnecting circuit breaker switch according to claim 1 or 2, characterized in that: The other end of the cam fixing seat is provided with four fixing holes, and the insulating accommodating groove is provided with four fixing bosses corresponding to the four fixing holes, and the four fixing holes are respectively provided with screws connected with the four fixing bosses.

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