Isolation circuit breaker

Abstract

The utility model belongs to the field of circuit breakers, and particularly relates to an isolation circuit breaker which comprises a mechanism frame, a circuit breaker unit and an isolation switch unit, the isolation switch unit comprises an isolation shaft, an isolation knife and a static contact, the isolation knife is in linkage fit with the isolation shaft, the isolation knife acts along with the isolation shaft, and connection or disconnection of the isolation knife and the static contact is achieved. Two cooling fins are arranged at the positions, corresponding to the two sides of the isolation knife, of the static contact, one end of each cooling fin is provided with a contact part extending in the direction of the isolation knife, and when the isolation knife is connected with the static contact, the contact parts of the two cooling fins are attached to the two sides of the isolation knife respectively; the two cooling fins are additionally arranged on the static contact, when the isolation knife is connected with the static contact, the contact portions of the two cooling fins are attached to the two sides of the isolation knife, the cooling fins can conduct heat of the isolation knife, heat dissipation of the isolation knife is facilitated, and therefore temperature rise can be reduced.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breaker technology, specifically relating to an isolating circuit breaker. Background Technology

[0002] Isolating circuit breakers are mainly used in medium-voltage distribution network systems. They are the core component of environmentally friendly gas-insulated ring main units and are used for line control and protection.

[0003] The existing isolating circuit breakers have poor heat dissipation performance of the isolating blade, resulting in high temperature rise and unreliable operation. In addition, the contact pressure between the isolating blade and the stationary contact is low, leading to unreliable contact between the isolating blade and the stationary contact. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide an isolation circuit breaker that effectively solves the heat dissipation problem of the isolation blade and helps to reduce temperature rise.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A circuit breaker includes a frame, a circuit breaker unit mounted on the frame, and a disconnecting switch unit mounted on the frame. The disconnecting switch unit includes an isolation shaft rotatably mounted on the frame, an isolation blade rotatably mounted on the frame, and a stationary contact mounted on the stationary end of the circuit breaker unit. The isolation blade is linked to the isolation shaft, and the isolation blade moves with the isolation shaft, thereby connecting or disconnecting the isolation blade from the stationary contact. Two heat sinks are provided on the stationary contact corresponding to both sides of the isolation blade. One end of each heat sink has a contact portion extending towards the isolation blade. When the isolation blade is connected to the stationary contact, the contact portions of the two heat sinks respectively adhere to both sides of the isolation blade.

[0006] In some embodiments, a bending guide portion that cooperates with the isolation blade is provided on one side of the contact portion of the two heat sinks. When the isolation blade is connected to the stationary contact, both sides of the isolation blade slide along the bending guide portion to the two contact portions.

[0007] In some embodiments, two insulating isolation plates covering the outside of the two heat sinks are provided on both sides of the stationary contact.

[0008] In some embodiments, the other end of the two heat sinks has a fixing part, and two fasteners are respectively provided on the two insulating isolation plates. The two fasteners pass through the two insulating isolation plates, the two washers, and the fixing parts of the two heat sinks in sequence and are connected to the stationary contact.

[0009] In some embodiments, the isolation blade includes two symmetrically distributed isolation blades and a spring assembly disposed between the two isolation blades, and the contact ends of the two isolation blades are respectively provided with two contact points that contact the stationary contact.

[0010] In some embodiments, the contact portions of the two heat sinks are attached to the contact ends of the two isolation blades, and the contact portions of the two heat sinks apply a pressure that brings the contact ends of the two isolation blades closer together.

[0011] In some embodiments, a slot is provided on the contact end of the two isolation blades between two contact points.

[0012] In some embodiments, the spring assembly includes a bolt and a screw. The two isolating blades are provided with through holes communicating with the slot. One end of the bolt passes through the through holes of the two isolating blades and is connected to the screw. The bolt is provided with a first spring seat. A first spring is provided between the first spring seat and the bolt head. The first spring seat abuts against one of the isolating blades. The screw is provided with a second spring seat. A second spring is provided between the second spring seat and the screw head. The second spring seat abuts against the other isolating blade.

[0013] In some embodiments, the two isolating blades are provided with positioning grooves on the side corresponding to the spring assembly, and the isolating shaft is provided with an insulating sleeve portion that cooperates with the two isolating blades. The insulating sleeve portion is provided with a positioning protrusion that cooperates with the positioning groove. The positioning protrusion is engaged in the positioning groove and constitutes a limiting cooperation between the two isolating blades and the insulating sleeve portion.

[0014] In some embodiments, multiple reinforcing ribs are provided on the outer wall of the insulating sleeve portion.

[0015] The beneficial effects of this invention are as follows: Two heat sinks are added to the stationary contact. When the isolating blade is connected to the stationary contact, the two heat sinks adhere to both sides of the isolating blade. The heat sinks can conduct heat from the isolating blade, which is beneficial for heat dissipation and thus helps reduce the temperature rise of the isolating circuit breaker. Furthermore, the contact portion of the two heat sinks applies a pressure that brings the two isolating blades of the isolating blade closer together, thereby increasing the contact pressure between the two isolating blades and the stationary contact, ensuring more reliable contact between the isolating blade and the stationary contact. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0017] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0018] Figure 2 This is a front view of an embodiment of the present utility model;

[0019] Figure 3 This is an assembly diagram of the isolation blade and isolation shaft according to an embodiment of the present utility model;

[0020] Figure 4 This is a perspective view of the heat sink in an embodiment of the present invention;

[0021] Figure 5 This is a perspective view of the isolation blade according to an embodiment of the present utility model;

[0022] Figure 6 This is a cross-sectional view of the isolation blade according to an embodiment of the present invention. Detailed Implementation

[0023] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0025] The directional and positional terms used in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, and side, are only for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0026] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments:

[0027] like Figure 1-4 As shown, an isolating circuit breaker includes a frame 1, a circuit breaker unit 2 mounted on the frame 1, and an isolating switch unit 3 mounted on the frame 1. The isolating switch unit 3 includes an isolating shaft 31 rotatably mounted on the frame 1, an isolating blade 32 rotatably mounted on the frame 1, and a stationary contact 33 mounted on the stationary end 21 of the circuit breaker unit 2. The isolating blade 32 is linked to the isolating shaft 31 and moves with the isolating shaft 31, thereby connecting or disconnecting the isolating blade 32 from the stationary contact 33. Two heat sinks 34 are provided on the stationary contact 33 corresponding to both sides of the isolating blade 32. One end of each heat sink 34 has a contact portion 341 extending toward the isolating blade 32. When the isolating blade 32 is connected to the stationary contact 33, the contact portions 341 of the two heat sinks 34 respectively adhere to both sides of the isolating blade 32. Two heat sinks are added to the stationary contact. When the isolating blade is connected to the stationary contact, the two heat sinks adhere to both sides of the isolating blade. The heat sinks can conduct heat from the isolating blade, which is beneficial for heat dissipation and thus helps reduce the temperature rise of the isolating circuit breaker. Furthermore, the contact portion of the two heat sinks applies a pressure that brings the two isolating blades of the isolating blade closer together, thereby increasing the contact pressure between the two isolating blades and the stationary contact, ensuring more reliable contact between the isolating blade and the stationary contact. The two heat sinks are made of copper, which has high thermal conductivity, thus benefiting heat dissipation of the isolating blades. A bent guide portion 342 is provided on one side of the contact portion 341 of the two heat sinks 34, which cooperates with the isolating blade 32. When the isolating blade 32 is connected to the stationary contact 33, both sides of the isolating blade 32 slide along the bent guide portion 342 onto the two contact portions 341. The bent guide portions of the two heat sinks guide the isolating blade, thus ensuring reliable contact between the isolating blade and the heat sink, which is beneficial for heat dissipation of the isolating blade. Two insulating isolation plates 35 are provided on both sides of the stationary contact 33, covering the outside of the two heat sinks 34. The insulating isolation plates serve to provide insulation and isolation, thereby increasing the phase-to-phase insulation distance of the isolating circuit breaker and improving insulation performance. The other end of each heat sink 34 has a fixing part 343. Two fasteners are respectively provided on each of the two insulating isolation plates 35. The two fasteners pass sequentially through the two insulating isolation plates 35, two washers 36, and the fixing parts 343 of the two heat sinks 34, and are connected to the stationary contact 33. The two heat sinks and two insulating isolation plates are fixed to the stationary contact by the fasteners, thus facilitating the assembly of the two heat sinks, two insulating isolation plates, and the stationary contact.

[0028] like Figure 3 , 5As shown in Figure 6, the isolation blade 32 includes two symmetrically distributed isolation blades 321 and a spring assembly 37 disposed between the two isolation blades 321. The contact ends 3210 of the two isolation blades 321 are respectively provided with two contact points 322 that contact the stationary contact 33. The isolation blade adopts a double-blade structure design, and the isolation blades adopt a double-contact structure design, which can ensure more reliable contact between the isolation blade and the stationary contact.

[0029] like Figure 1-3 As shown, the contact portions 341 of the two heat sinks 34 are attached to the contact ends 3210 of the two isolation blades 321, and the contact portions 341 of the two heat sinks 34 apply a pressure that brings them closer together to the contact ends 3210 of the two isolation blades 321. The contact portions of the heat sinks can conduct heat from the contact ends of the two isolation blades, which is beneficial for heat dissipation of the two isolation blades and reduces temperature rise. The contact portions of the two heat sinks apply a clamping force to the two isolation blades, which helps to increase the contact pressure of the two isolation blades on the stationary contact, thereby ensuring more reliable contact between the two isolation blades and the stationary contact. A slot 323 is provided on the contact ends 3210 of the two isolation blades 321 at the positions corresponding to the two contact points 322. The slots on the two isolation blades increase the surface area of ​​the isolation blades, improve the efficiency of convection and radiation heat dissipation, and reduce temperature rise. In addition, the slots divide the isolation blades into multiple parallel conductive paths, making the current distribution more uniform and avoiding local overheating.

[0030] like Figure 3 , 4 As shown in Figure 6, the spring assembly 37 includes a bolt 371 and a screw 372. Two isolating blades 321 have through holes 324 communicating with slots 323. One end of the bolt 371 passes through the through holes 324 of the two isolating blades 321 and is connected to the screw 372. A first spring seat 373 is provided on the bolt 371, and a first spring 374 is provided between the first spring seat 373 and the head of the bolt 371. The first spring seat 373 abuts against one of the isolating blades 321. A second spring seat 375 is provided on the screw 372, and a second spring 376 is provided between the second spring seat 375 and the head of the screw 372. The second spring seat 375 abuts against the other isolating blade 321. The first and second springs of the spring assembly can increase the contact pressure of the two isolating blades on the stationary contact, thereby improving the contact reliability between the isolating blades and the stationary contact.

[0031] like Figure 3As shown, each of the two isolating blades 321 has a positioning groove 325 on the side corresponding to the spring assembly 37. The isolating shaft 31 has an insulating sleeve portion 311 that mates with the two isolating blades 321. Inside the insulating sleeve portion 311, a positioning protrusion 3111 mates with the positioning groove 325. The positioning protrusion 3111 engages within the positioning groove 325, forming a limiting fit between the two isolating blades 321 and the insulating sleeve portion 311. The two isolating blades are engaged with the positioning protrusion inside the insulating sleeve via the positioning groove, thus ensuring more reliable transmission between the two isolating blades and the isolating shaft. Multiple reinforcing ribs 3112 are provided on the outer wall of the insulating sleeve portion 311. The insulating sleeve portion and the isolating shaft are integrally molded using injection molding. The reinforcing ribs enhance the strength of the insulating sleeve portion, which helps extend the service life of the entire isolating shaft.

[0032] The above description is only one embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model; the scope of protection of the present utility model is defined by the claims in the claims, and all equivalent changes and modifications made in accordance with the utility model are within the scope of protection of the present utility model patent.

Claims

1. An isolating circuit breaker comprising a mechanism frame, a circuit breaker unit provided on the mechanism frame, and an isolating switch unit provided on the mechanism frame, characterized by: The disconnecting switch unit includes an isolating shaft rotatably mounted on a frame, an isolating blade rotatably mounted on the frame, and a stationary contact mounted on the stationary end of the circuit breaker unit. The isolating blade is linked to the isolating shaft, and moves with the isolating shaft to connect or disconnect the isolating blade from the stationary contact. Two heat sinks are provided on the stationary contact corresponding to both sides of the isolating blade. One end of each heat sink has a contact portion extending toward the isolating blade. When the isolating blade is connected to the stationary contact, the contact portions of the two heat sinks are respectively attached to both sides of the isolating blade.

2. The isolating circuit breaker of claim 1, wherein: The two heat sinks have a bent guide portion on one side of the contact portion that cooperates with the isolation blade. When the isolation blade is connected to the stationary contact, the two sides of the isolation blade slide along the bent guide portion to the two contact portions.

3. The isolating circuit breaker according to claim 1 or 2, characterized in that: The stationary contact is provided with two insulating isolation plates on both sides, which cover the outside of the two heat sinks.

4. The isolating circuit breaker of claim 3, wherein: The other end of each of the two heat sinks has a fixing part, and each of the two insulating isolation plates is provided with two fasteners. The two fasteners pass through the two insulating isolation plates, the two washers, and the fixing parts of the two heat sinks in sequence and are connected to the stationary contact.

5. The isolating circuit breaker of claim 1, wherein: The isolation blade includes two symmetrically distributed isolation blades and a spring assembly disposed between the two isolation blades. The contact ends of the two isolation blades are respectively provided with two contact points that contact the stationary contact.

6. The isolating circuit breaker of claim 5, wherein: The contact portions of the two heat sinks are attached to the contact ends of the two isolation blades, and the contact portions of the two heat sinks apply a pressure that brings the contact ends of the two isolation blades closer together.

7. The isolating circuit breaker according to claim 5 or 6, characterized in that: The two isolation blades have slots on their contact ends corresponding to the two contact points.

8. The isolating circuit breaker of claim 7, wherein: The spring assembly includes a bolt and a screw. The two isolating blades are provided with through holes that communicate with the slot. One end of the bolt passes through the through holes of the two isolating blades and is connected to the screw. The bolt is provided with a first spring seat. A first spring is provided between the first spring seat and the bolt head. The first spring seat abuts against one of the isolating blades. The screw is provided with a second spring seat. A second spring is provided between the second spring seat and the screw head. The second spring seat abuts against the other isolating blade.

9. The isolating circuit breaker of claim 8, wherein: The two isolating blades are provided with positioning grooves on the side corresponding to the spring assembly. The isolating shaft is provided with an insulating sleeve part that cooperates with the two isolating blades. The insulating sleeve part is provided with a positioning protrusion that cooperates with the positioning groove. The positioning protrusion is engaged in the positioning groove and forms a limiting cooperation between the two isolating blades and the insulating sleeve part.

10. The isolating circuit breaker of claim 9, wherein: Multiple reinforcing ribs are provided on the outer wall of the insulating sleeve.

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