Double-break circuit breaker switch

Abstract

The utility model relates to a double-break circuit breaker switch, which comprises a mechanism frame, a circuit breaker assembly and an isolating switch assembly, and the circuit breaker assembly comprises a solid-sealed polar pole, three fixing seats, a main shaft and three groups of transmission cam assemblies. The isolation switch assembly comprises three first static contacts, an insulation isolation shaft which is rotatably arranged on the mechanism frame, three insulation cams which are respectively arranged on the insulation isolation shaft, three isolation knives which are respectively arranged on the three insulation cams, three second static contacts which are arranged on a fixed beam of the mechanism frame, and a grounding contact assembly which is arranged on the mechanism frame. The two ends of the static contact are respectively provided with a first contact part and a second contact part which are matched with the isolation knife, and a limiting check ring which is matched with the isolation knife is arranged at the position, corresponding to the position between the first contact part and the second contact part, of the static contact. The vacuum circuit breaker has the advantages of simple structure, stable and reliable performance, good insulating property, high opening and closing speed and small volume.

Description

Technical Field

[0001] The utility model relates to a circuit breaker switch, in particular to a double-break 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, isolating 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 transmission torque of the isolating shaft and the isolating knife of the existing circuit breaker switch is large, resulting in a slow opening and closing speed of the isolating switch, and the insulation performance of the double-break isolating switch is unreliable, which cannot meet the insulation requirements of the ring main unit. In addition, the isolating switch also has the defects of complex structure, unreliable performance, and large size. Summary of the invention

[0003] The utility model aims to overcome the defects of the prior art and provide a double-break circuit breaker switch with simple structure, stable and reliable performance, good insulation performance, fast opening and closing speed and small size.

[0004] To achieve the above-mentioned purpose, the utility model adopts a double-break 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 fixed seats arranged on the sealed pole, a main shaft rotatably arranged on the three fixed 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. The isolating switch assembly includes three first static contacts arranged on the sealed pole and electrically connected to the three vacuum arc extinguishing chambers, an insulating isolation shaft rotatably arranged on the mechanism frame, three insulating cams respectively arranged on the insulating isolation shafts, three isolating knives respectively arranged on the three insulating cams, three second static contacts arranged on the fixed beam of the mechanism frame, and a grounding contact assembly arranged on the mechanism frame, and the first static contact has a first contact portion and a second contact portion respectively at both ends thereof that cooperate with the isolating knife, and a limit retaining ring that cooperates with the isolating knife is arranged on the first static contact corresponding to the first contact portion and the second contact portion.

[0005] The beneficial effects of the above structure are: the insulating isolation shaft drives three isolating knives through three insulating drive cams, and the cam eccentric drive structure design is adopted, so the transmission torque of the isolating knife is smaller and the transmission speed is faster, which is conducive to speeding up the opening and closing speed of the isolating switch. The insulating isolation shaft and the insulating drive cam are made of insulating materials with better insulation performance, and the isolating knife cooperates with the upper static head and the second static contact, and adopts a double-break structure design, which is safer. The limit ring has a limiting effect on the isolating knife, thereby ensuring that the contact between the isolating knife and the first static contact is more reliable, and the circuit breaker assembly adopts a sealed pole structure design with better insulation performance. Therefore, the double-break isolating switch has the advantages of simple structure, stable and reliable performance, good insulation performance, fast opening and closing speed, and small size.

[0006] In particular, the mechanism frame is provided with an insulating partition separating the grounding contact assembly and the three second stationary contacts. The insulating partition can improve the insulation performance between the first stationary contact and the grounding contact group, which is safer and is conducive to the miniaturization of the isolating switch.

[0007] In particular, a clamping protrusion is provided at each end of the insulating partition, and clamping holes matching with the clamping protrusion are provided on the two side plates of the mechanism frame, and the clamping protrusion is clamped in the clamping hole to form a clamping fit between the insulating partition and the two side plates. The insulating partition is clamped on the two side plates of the mechanism frame through the clamping protrusion, so that the assembly efficiency of the isolating switch is higher.

[0008] In particular, the grounding contact assembly includes a grounding bracket arranged between two side plates of the mechanism frame, a grounding copper bar arranged on the grounding bracket, and three grounding contacts respectively arranged on the grounding copper bar and matched with the isolating knife. The three grounding contacts are T-shaped, and a guide slope matched with the isolating knife is arranged on one side of the grounding contact. The grounding bracket is provided with a limit plate abutting against the other side of the grounding contact. The grounding contact assembly adopts a modular structural design, which is conducive to the modular assembly of the grounding contact group and the mechanism frame, and the grounding contact adopts a T-shaped structural design, so as to ensure that the contact between the grounding contact and the isolating knife is more reliable, and the limit plate on the grounding bracket plays a limiting role on the grounding contact, so as to ensure that the connection between the grounding contact and the grounding bracket is more compact.

[0009] In particular, a limit stopper is provided on one side of the second static contact, a buffer plate is provided between the second static contact and the limit stopper, and a closing guide inclined surface matched with the isolating knife is provided on the other side of the second static contact. The buffer plate has a buffering effect on the isolating knife, and the closing guide inclined surface has a guiding effect on the isolating knife, thereby ensuring that the contact between the isolating knife and the first static contact is more reliable.

[0010] In particular, a limiting protrusion is respectively arranged on the two sides of the first static contact corresponding to the sealed pole, and the two limiting protrusions respectively abut on the two sides of the first static contact, and constitute the limiting cooperation between the first static contact and the two limiting protrusions, and the first static contact is provided with a screw connected to the sealed pole. The two limiting protrusions of the sealed pole can limit the first static contact, thereby ensuring that the connection between the first static contact and the sealed pole is more compact, which is conducive to improving the working reliability of the circuit breaker switch.

[0011] In particular, the main shaft is provided with insulating retaining rings separated between the three groups of transmission cam components. The insulating retaining rings can enhance the interphase insulation performance between the three groups of transmission cam components, thereby facilitating the improvement of the safety performance of the circuit breaker switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a stereogram of an embodiment of the utility model.

[0013] Figure 2 This is an exploded view of an embodiment of the utility model.

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

[0015] like Figures 1 to 3As shown, the embodiment of the utility model is a double-break 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 fixed seats 22 arranged on the sealed pole 21, a main shaft 23 rotatably arranged on the three fixed seats 22, and three groups of transmission cam assemblies 24 that cooperate with the main shaft 23 and are used to drive three vacuum interrupter chambers 211 of the sealed pole 21 to perform opening and closing actions, and the isolating switch assembly 30 includes a sealed pole 21 arranged on the sealed pole 21 and three vacuum interrupter chambers 22 arranged on the sealed pole 21. The invention relates to a circuit breaker 21, wherein the first static contact 31 is electrically connected to the first static contact 31, an insulating isolation shaft 32 rotatably arranged on the mechanism frame 10, three insulating cams 33 respectively arranged on the insulating isolation shaft 32, three isolation knives 34 respectively arranged on the three insulating cams 33, three second static contacts 35 arranged on the fixed beam 101 of the mechanism frame 10, and a grounding contact assembly 36 arranged on the mechanism frame 10, wherein the first static contact 31 has a first contact portion 311 and a second contact portion 312 respectively matched with the isolation knives 34 at both ends, and a limit retaining ring 37 matched with the isolation knives 34 is arranged between the first contact portion 311 and the second contact portion 312 on the first static contact 31. The main shaft 23 is respectively provided with insulating retaining rings 25 separated between the three groups of transmission cam assemblies 24. The insulating retaining rings can enhance the interphase insulation performance between the three groups of transmission cam assemblies, thereby facilitating the improvement of the safety performance of the circuit breaker switch.

[0016] The mechanism frame 10 is provided with an insulating partition 38 separating the grounding contact assembly 36 and the three second static contacts 35. The insulating partition can improve the insulation performance between the second static contact and the grounding contact group, which is safer and is conducive to the miniaturization of the isolating switch. The two ends of the insulating partition 38 are respectively provided with a snap-in protrusion 381, and the two side plates 102 of the mechanism frame 10 are respectively provided with snap-in holes 1021 that match the snap-in protrusion 381. The snap-in protrusion 381 is snapped into the snap-in hole 1021, and constitutes the snap-in fit between the insulating partition 38 and the two side plates 102. The insulating partition is snapped on the two side plates of the mechanism frame through the snap-in protrusion, so that the assembly efficiency of the isolating switch is higher.

[0017] like Figure 1 and 2As shown, the grounding contact assembly 36 comprises a grounding bracket 361 disposed between two side plates 102 of the mechanism frame 10, a grounding copper bar 362 disposed on the grounding bracket 361, and three grounding contacts 363 disposed on the grounding copper bar 362 and matched with the isolation knife 34, the three grounding contacts 363 are in a T-shaped shape, one side of the grounding contact 363 is provided with a guide inclined surface 3631 matched with the isolation knife 34, and the grounding bracket 361 is provided with a limiting piece 3611 abutting against the other side of the grounding contact 363. The grounding contact assembly adopts a modular structural design, which is conducive to the modular assembly of the grounding contact group and the mechanism frame, and the grounding contact adopts a T-shaped structural design, so as to ensure that the contact between the grounding contact and the isolation knife is more reliable, and the limiting piece on the grounding bracket plays a limiting role on the grounding contact, so as to ensure that the connection between the grounding contact and the grounding bracket is more compact. A limit stopper 39 is provided on one side of the second static contact 35, a buffer plate 391 is provided between the second static contact 35 and the limit stopper 39, and a closing guide inclined surface 351 matching with the isolation knife 34 is provided on the other side of the second static contact 35. The buffer plate has a buffering effect on the isolation knife, and the closing guide inclined surface has a guiding effect on the isolation knife, thereby ensuring that the contact between the isolation knife and the first static contact is more reliable.

[0018] like Figure 3 As shown, a limiting protrusion 212 is respectively provided on the two sides of the first static contact 31 on the sealed pole 21, and the two limiting protrusions 212 respectively abut on the two sides of the first static contact 31, and constitute the limiting cooperation between the first static contact 31 and the two limiting protrusions 212, and the first static contact 31 is provided with a screw 213 connected to the sealed pole 21. The two limiting protrusions of the sealed pole can limit the first static contact, thereby ensuring that the connection between the first static contact and the sealed pole is more compact, which is conducive to improving the working reliability of the circuit breaker switch.

[0019] The insulating isolation shaft drives three isolating knives through three insulating drive cams. The cam eccentric drive structure is adopted. The transmission torque of the isolating knife is smaller and the transmission speed is faster, which is conducive to speeding up the opening and closing speed of the isolating switch. The insulating isolation shaft and the insulating drive cam are made of insulating materials with better insulation performance. The isolating knife cooperates with the upper static head and the second static contact, and adopts a double-break structure design, which is safer. The limit ring has a limiting effect on the isolating knife, thereby ensuring that the contact between the isolating knife and the first static contact is more reliable, and the circuit breaker assembly adopts a sealed pole structure design with better insulation performance. Therefore, the double-break isolating switch has the advantages of simple structure, stable and reliable performance, good insulation performance, fast opening and closing speed, and small size.

Claims

1. A double-break circuit breaker switch, characterized in that: It includes 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 fixed seats arranged on the sealed pole, a main shaft rotatably arranged on the three fixed 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. The isolating switch assembly includes three first static contacts arranged on the sealed pole and electrically connected to the three vacuum arc extinguishing chambers, an insulating isolation shaft rotatably arranged on the mechanism frame, three insulating cams respectively arranged on the insulating isolation shaft, three isolating knives respectively arranged on the three insulating cams, three second static contacts arranged on the fixed beam of the mechanism frame, and a grounding contact assembly arranged on the mechanism frame, wherein the two ends of the static contact are respectively provided with a first contact portion and a second contact portion that cooperate with the isolating knife, and a limit retaining ring that cooperates with the isolating knife is arranged between the corresponding first contact portion and the second contact portion on the static contact.

2. The double-break circuit breaker switch according to claim 1, characterized in that: The mechanism frame is provided with an insulating partition plate separating the grounding contact assembly and the three second stationary contacts.

3. The double-break circuit breaker switch according to claim 2, characterized in that: The two ends of the insulating partition are respectively provided with a clamping protrusion, and the two side plates of the mechanism frame are respectively provided with clamping holes matching with the clamping protrusion. The clamping protrusion is clamped in the clamping hole to form a clamping fit between the insulating partition and the two side plates.

4. The double-break circuit breaker switch according to claim 1 or 2, characterized in that: The grounding contact assembly includes a grounding bracket arranged between two side plates of the mechanism frame, a grounding copper bar arranged on the grounding bracket, and three grounding contacts respectively arranged on the grounding copper bar and matched with the isolation knife. The three grounding contacts are T-shaped, and a guide slope matched with the isolation knife is arranged on one side of the grounding contact. The grounding bracket is provided with a limit plate that abuts against the other side of the grounding contact.

5. The double-break circuit breaker switch according to claim 1 or 2, characterized in that: A limit baffle is arranged on one side of the second static contact, a buffer plate is arranged between the second static contact and the limit baffle, and a closing guide inclined surface matched with the isolating knife is arranged on the other side of the second static contact.

6. The double-break circuit breaker switch according to claim 1 or 2, characterized in that: A limiting protrusion is respectively arranged on both sides of the first static contact corresponding to the sealed pole, and the two limiting protrusions respectively abut on both sides of the first static contact, and constitute a limiting cooperation between the first static contact and the two limiting protrusions. A screw connected to the sealed pole is arranged on the first static contact.

7. The double-break circuit breaker switch according to claim 1 or 2, characterized in that: The main shaft is respectively provided with insulating retaining rings separated between the three groups of transmission cam components.

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