Double-break isolating switch

Abstract

The utility model relates to a double-break isolating switch. Comprising a mechanism frame, an insulation isolation shaft rotationally arranged on the mechanism frame, three insulation driving cams arranged on the insulation isolation shaft in a linkage mode, three isolation knives arranged on the three insulation driving cams in a linkage mode, and three upper static contacts arranged on a fixed beam of the mechanism frame and matched with the three isolation knives. The three upper static contacts are arranged on a fixing frame of the mechanism frame, the three lower static contacts are arranged on the fixing frame of the mechanism frame and matched with the three isolation knives, the grounding contact assembly is arranged on the mechanism frame and matched with the three isolation knives, and the mechanism frame is provided with an insulating partition plate which is arranged between the grounding contact assembly and the three upper static contacts in a partition mode. The utility model has the advantages of simple structure, stable and reliable performance, fast opening and closing speed, good insulation performance and small volume.

Description

Technical Field

[0001] The utility model relates to an isolating switch, in particular to a double-break isolating switch. Background Art

[0002] At present, many large-scale power consumption sites have been using ring network cabinets on a large scale; the ring network cabinet has a simple structure, safe and reliable operation, low maintenance frequency and low operating costs. Compared with the traditional switch cabinet, the advantages are very prominent. In the technology of the ring network cabinet, the isolating switch is widely used. As a circuit switch in the ring network cabinet, the isolating switch not only plays the role of an ordinary switch, but also ensures the reliable grounding of the safety break and the lower end of the isolation, which absolutely guarantees the safety of circuit maintenance and repair personnel. It is one of the very important components in the ring network cabinet. The transmission torque of the isolation shaft and the isolation knife of the existing double-break isolating 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 network cabinet. 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 disconnector with simple structure, stable and reliable performance, fast opening and closing speed, good insulation performance and small size.

[0004] To achieve the above-mentioned purpose, the utility model adopts a double-break isolating switch, including a mechanism frame, an insulating isolation shaft rotatably arranged on the mechanism frame, three insulating drive cams linked to the insulating isolation shaft, three isolating knives linked to the three insulating drive cams, three upper static contacts arranged on a fixed beam of the mechanism frame and matched with the three isolating knives, three lower static contacts arranged on a fixed frame of the mechanism frame and matched with the three isolating knives, and a grounding contact assembly arranged on the mechanism frame and matched with the three isolating knives, wherein the mechanism frame is provided with an insulating partition separating the grounding contact assembly and the three upper static contacts.

[0005] The beneficial effects of the above structure are: the insulating isolation shaft drives three isolating knives through three insulating driving cams, and the cam eccentric driving 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 driving cam are made of insulating materials with better insulation performance, and the isolating knife cooperates with the upper static head and the lower static contact, and adopts a double-break structure design with higher safety. The insulating partition can improve the insulation performance between the upper static contact and the grounding contact group, which is conducive to the miniaturization of the isolating switch. Therefore, the double-break isolating switch has the advantages of simple structure, stable and reliable performance, fast opening and closing speed, good insulation performance and small size.

[0006] In particular, the lower static contact has a first contact portion and a second contact portion that match the isolating knife, and a limit ring that matches the isolating knife is provided between the first contact portion and the second contact portion on the lower static contact. The limit ring has a limiting effect on the isolating knife, which can ensure that the contact between the isolating knife and the lower static contact is more reliable.

[0007] In particular, the height of the first contact portion is greater than the height of the second contact portion. The lower static contact contacts the isolating blade via the first contact portion and the second contact portion, thereby ensuring that the contact between the lower static contact and the isolating blade is more reliable.

[0008] In particular, a guide slope matched with the isolation knife is respectively arranged on one side of the first contact part and the second contact part. The guide slope guides the isolation knife and ensures that the first contact part, the second contact part and the isolation knife are in more reliable contact.

[0009] In particular, a limit stopper is provided on one side of the upper static contact, a buffer plate is provided between the upper 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 upper 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 upper static contact is more reliable.

[0010] In particular, the isolation knife comprises two isolation blades symmetrically arranged on both sides of one end of the insulating driving cam, and contact bumps are respectively arranged on both ends of the two isolation blades. The isolation knife adopts a double isolation blade structure design, and the isolation blades contact the upper static contact and the lower static contact through the contact bumps, thereby ensuring the contact reliability between the isolation knife and the upper static contact and the lower static contact.

[0011] In particular, the fixed beam is provided with insulating retaining rings separated between the three upper static contacts, and the fixed frame is provided with retaining rings separated between the three lower static contacts. The insulating retaining rings can increase the creepage distance between the three upper static contacts and the three lower static contacts, which is beneficial to improving the insulation performance of the disconnector.

[0012] 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.

[0013] In particular, the grounding contact assembly comprises 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, and the three grounding contacts are in the shape of a T. 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, thereby ensuring that the contact between the grounding contact and the isolation knife is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a stereogram of an embodiment of the utility model.

[0015] Figure 2 This is an exploded view of an embodiment of the utility model.

[0016] Figure 3 It is the front view of the embodiment of the utility model. DETAILED DESCRIPTION

[0017] like Figures 1 to 3As shown, the embodiment of the utility model is a double-break disconnector, comprising a mechanism frame 10, an insulating isolation shaft 11 rotatably arranged on the mechanism frame 10, three insulating drive cams 12 linked to the insulating isolation shaft 11, three isolation knives 13 linked to the three insulating drive cams 12, three upper static contacts 14 arranged on a fixed beam 101 of the mechanism frame 10 and matched with the three isolation knives 13, three lower static contacts 15 arranged on a fixed frame 102 of the mechanism frame 10 and matched with the three isolation knives 13, and a grounding contact assembly 20 arranged on the mechanism frame 10 and matched with the three isolation knives 13, wherein the mechanism frame 10 is provided with an insulating partition 16 separating the grounding contact assembly 20 and the three upper static contacts 14. The lower static contact 15 has a first contact portion 151 and a second contact portion 152 that match the isolation knife 13. A limit ring 17 that matches the isolation knife 13 is provided between the first contact portion 151 and the second contact portion 152 on the lower static contact 15. The limit ring plays a limiting role on the isolation knife, which can ensure that the isolation knife and the lower static contact are in contact more reliably. The height of the first contact portion 151 is greater than the height of the second contact portion 152. The lower static contact contacts the isolation knife through the first contact portion and the second contact portion, thereby ensuring that the lower static contact and the isolation knife are in contact more reliably. A guide slope 153 that matches the isolation knife 13 is provided on one side of the first contact portion 151 and the second contact portion 152, respectively. The guide slope plays a guiding role on the isolation knife, which can ensure that the first contact portion, the second contact portion and the isolation knife are in contact more reliably. A limit stopper 18 is provided on one side of the upper static contact 14, a buffer plate 19 is provided between the upper static contact 14 and the limit stopper 18, and a closing guide inclined surface 141 matching with the isolation knife 13 is provided on the other side of the upper static contact 14. 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 upper static contact is more reliable.

[0018] like Figure 1 and 2As shown, the isolation knife 13 includes two isolation blades 131 symmetrically arranged on both sides of one end of the insulating driving cam 12, and contact protrusions 132 are respectively arranged on both ends of the two isolation blades 131. The isolation knife adopts a double isolation blade structure design, and the isolation blades contact the upper static contact and the lower static contact through the contact protrusions, so as to ensure the contact reliability between the isolation knife and the upper static contact and the lower static contact. The fixed beam 101 is respectively provided with insulating retaining rings 1011 separated between the three upper static contacts 14, and the fixed frame 102 is respectively provided with retaining rings 1021 separated between the three lower static contacts 15. The insulating retaining rings can increase the creepage distance between the three upper static contacts and the three lower static contacts, which is conducive to improving the insulation performance of the disconnector. The insulating partition 16 is provided with a snap-on protrusion 161 at both ends, and the two side plates 103 of the mechanism frame 10 are provided with snap-on holes 1031 matched with the snap-on protrusion 161, and the snap-on protrusion 161 is snapped into the snap-on holes 1031, and constitutes the snap-on match between the insulating partition 16 and the two side plates 103. The insulating partition is snapped on the two side plates of the mechanism frame through the snap-on protrusion, so that the assembly efficiency of the isolating switch is higher. The grounding contact assembly 20 includes a grounding bracket 21 arranged between the two side plates 103 of the mechanism frame 10, a grounding copper bar 22 arranged on the grounding bracket 21, and three grounding contacts 23 respectively arranged on the grounding copper bar 22 and matched with the isolation knife 13, and the shape of the three grounding contacts 23 is T-shaped. 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 that the contact between the grounding contact and the isolation knife can be ensured to be more reliable.

[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 lower static contact, and adopts a double-break structure design with higher safety. The insulating partition can improve the insulation performance between the upper static contact and the grounding contact group, which is conducive to the miniaturization of the isolating switch. Therefore, the double-break isolating switch has the advantages of simple structure, stable and reliable performance, fast opening and closing speed, good insulation performance and small size.

Claims

1. A double-break disconnector, characterized in that: The invention comprises a mechanism frame, an insulating isolation shaft rotatably arranged on the mechanism frame, three insulating driving cams linked to the insulating isolation shaft, three isolating knives linked to the three insulating driving cams, three upper static contacts arranged on a fixed beam of the mechanism frame and matched with the three isolating knives, three lower static contacts arranged on a fixed frame of the mechanism frame and matched with the three isolating knives, and a grounding contact assembly arranged on the mechanism frame and matched with the three isolating knives. The mechanism frame is provided with an insulating partition separating the grounding contact assembly and the three upper static contacts.

2. The double-break disconnector according to claim 1, characterized in that: The lower static contact has a first contact portion and a second contact portion matched with the isolating knife, and a limit retaining ring matched with the isolating knife is arranged between the first contact portion and the second contact portion on the lower static contact.

3. The double-break disconnector according to claim 2 is characterized in that :The height of the first contact portion is greater than the height of the second contact portion.

4. The double-break disconnector according to claim 2 or 3, characterized in that : A guiding inclined surface matching with the isolation knife is respectively arranged on one side of the first contact portion and the second contact portion.

5. The double-break disconnector according to claim 1 or 2, characterized in that A limit baffle is arranged on one side of the upper static contact, a buffer plate is arranged between the upper 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 upper static contact.

6. The double-break disconnector according to claim 1 or 2, characterized in that The isolation blade comprises two isolation blades symmetrically arranged on both sides of one end of the insulating driving cam, and contact protrusions are respectively arranged on both ends of the two isolation blades.

7. The double-break disconnector according to claim 1 or 2, characterized in that : The fixed beam is respectively provided with insulating retaining rings separating the three upper static contacts, and the fixed frame is respectively provided with retaining rings separating the three lower static contacts.

8. The double-break disconnector according to claim 1 or 2, characterized in that : A snap-fitting protrusion is respectively arranged at both ends of the insulating partition, and snap-fitting holes matching with the snap-fitting protrusion are respectively arranged on the two side plates of the mechanism frame, and the snap-fitting protrusion is snapped into the snap-fitting hole to form a snap-fitting fit between the insulating partition and the two side plates.

9. The double-break disconnector according to claim 1 or 2, characterized in that The grounding contact assembly includes a grounding bracket arranged between two side plates of the frame, a grounding copper bar arranged on the grounding bracket, and three grounding contacts respectively arranged on the grounding copper bar and matched with isolation blades. The three grounding contacts are T-shaped.

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