Circuit breaker top cover mounting structure

Abstract

A circuit breaker top cover mounting structure is characterized in that a plurality of split top covers are mounted above corresponding arc extinguish chambers in corresponding phases of a circuit breaker, and rear side end faces of two adjacent top covers in the plurality of top covers mounted on the corresponding arc extinguish chambers in the corresponding phases of the circuit breaker are spliced by a staggered structure. The split type blowout prevention arc top cover structure is adopted, so that the installation is convenient, the replacement and maintenance cost is low, the universality is high, the device can be adapted to circuit breakers of different models and specifications, and the flexibility and the universality are high.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breakers, and specifically relates to an installation structure of a circuit breaker top cover. Background Art

[0002] During the process of opening and closing the moving and static contacts of a circuit breaker, an electric arc will be generated. After the electric arc enters the arc extinguishing chamber, it will be quickly cut off and extinguished, but the free conductive particles generated by it will still be ejected from the arc extinguishing chamber together with the high-pressure gas. Therefore, generally, a circuit breaker and a transfer switch electrical appliance will install a arc shielding cover outside the arc extinguishing chamber to block the ejected arc particles, play a role in deionization, and achieve the purpose of zero flashover.

[0003] When the circuit breaker performs a breaking operation, an electric arc will be generated between the contacts. If not controlled, the electric arc may spread in all directions, especially spray backward into the rear of the switch cabinet, causing damage to the surrounding electrical components and even triggering a fire. The top cover of the circuit breaker for preventing backward arc spraying is a key safety protection structure in the circuit breaker, mainly used to prevent the electric arc generated when the circuit breaker opens the circuit from spraying backward. In the prior art, the top cover of the circuit breaker for preventing backward arc spraying is an integral type, with a large volume, high cost, long production cycle, and it is easy to cause phase-to-phase short circuit due to the lack of separation of adjacent phase arcs, and the versatility of the top cover parts is poor. Summary of the Utility Model

[0004] The purpose of the utility model is to address the above-mentioned defects existing in the top cover of the existing circuit breaker for preventing backward arc spraying, and provide an installation structure of a circuit breaker top cover. The split-type arc spraying prevention top cover structure is adopted to make the installation convenient, with lower replacement and maintenance costs, strong versatility, and can be adapted to different models and specifications of circuit breakers, having high flexibility and versatility.

[0005] Technical Solution

[0006] In order to achieve the above technical purpose, the utility model provides an installation structure of a circuit breaker top cover, which is characterized in that: several split top covers are installed above the corresponding arc extinguishing chambers in the corresponding phases of the circuit breaker, and the rear end faces of adjacent two top covers among the several top covers installed on the corresponding arc extinguishing chambers in the corresponding phases of the circuit breaker are spliced by using a dislocation structure.

[0007] In one embodiment, the several top covers share the installation screws of the corresponding arc extinguishing chambers in the corresponding phases of the circuit breaker and are installed on the base and bottom plate of the circuit breaker.

[0008] In one embodiment, the exhaust holes on the left and right sides of the several top covers are arranged in a dislocation manner.

[0009] In one embodiment, the front end faces of the several top covers have exhaust holes.

[0010] In one embodiment, the dislocation structure includes a raised step one on one side of one of the adjacent top covers among several top covers and a raised step two on the corresponding side of the other top cover. The raised step two and the raised step one are dislocated in the front-back direction and are fitted and installed together in the front-back direction.

[0011] In one embodiment, guiding ribs are provided on at least the upper side surface of the inner cavities of several top covers to guide the arc to move along a predetermined path.

[0012] In one embodiment, the bracket is fixedly installed on the base, the bracket is located at the front side of the top cover, and the secondary terminal is fixed on the bracket.

[0013] In one embodiment, the upper end surface of the bracket is flush with the upper end surfaces of several top covers.

[0014] In one embodiment, the several top covers are split anti-arc plastic top covers.

[0015] In one embodiment, exhaust holes are provided on the lower side of the front end surfaces of the several top covers. The bracket is located at the front side of the several top covers, and there is a gap between the exhaust holes and the bracket.

[0016] Advantageous Effects

[0017] The present utility model provides a mounting structure for a circuit breaker top cover. The split several top covers are installed above the corresponding arc extinguishing chambers in the corresponding phases of the circuit breaker. The rear end faces between two adjacent top covers among the several top covers installed on the corresponding arc extinguishing chambers in the corresponding phases of the circuit breaker are spliced using a dislocation structure. The adoption of the split anti-arc top cover structure makes the installation convenient, the replacement and maintenance costs are low, the universality is strong, it can be adapted to circuit breakers of different models and specifications, and it has high flexibility and universality. Brief Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0019] Att Figure 1 is a schematic diagram of a circuit breaker in an embodiment of the present utility model;

[0020] Att Figure 2 is a schematic diagram of the dislocation structure in an embodiment of the present utility model;

[0021] Att Figure 3It is a schematic diagram of the splint and the secondary terminal in the embodiment of the present utility model;

[0022] Appendix Figure 4 It is a schematic diagram of the installation of the top cover of the arc extinguishing chamber in the embodiment of the present utility model;

[0023] Appendix Figure 5 It is a schematic diagram of the structure of the top cover of the arc extinguishing chamber in the embodiment of the present utility model Figure 1 ;

[0024] Appendix Figure 6 It is a schematic diagram of the structure of the top cover of the arc extinguishing chamber in the embodiment of the present utility model Figure 2 ;

[0025] Appendix Figure 7 It is a schematic diagram of the position of the guide rib in the embodiment of the present utility model; Detailed implementation manners

[0026] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0027] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the description of the present application are only for the purpose of illustration and do not represent the only implementation manner.

[0028] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0029] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first feature is in direct contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, the first feature being "above", "over" or "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" or "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0030] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the technical field to which this application pertains. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the related listed items.

[0031] Embodiment

[0032] In the prior art, the top cover of the circuit breaker for preventing backward arc spraying is integrally formed, with a relatively large volume, high cost, and long production cycle. The arcs between adjacent phases are not separated, making it easy for the arc to overflow, and the versatility of the top cover parts is relatively poor. To solve this problem, as shown in the appendix Figure 1 In this embodiment, a mounting structure for the top cover of a circuit breaker is provided. A plurality of split top covers 1 are installed above the corresponding arc extinguishing chambers 2 in the corresponding phases of the circuit breaker. The bracket 6 is fixedly installed on the base 4, and the face mask 8 is installed on the base 4 with screws. In this embodiment, the upper end surfaces of the bracket 6 and the plurality of top covers 1 are flush. As shown in the appendix Figure 1 In this embodiment, the side of the face mask 8 installed on the base 4 is the front of the base 4.

[0033] As shown in the appendix Figure 3 In this embodiment, the secondary terminal 7 is fixed on the bracket 6. The rear end faces of two adjacent top covers 1a, 1a' among the plurality of top covers 1 installed on the corresponding arc extinguishing chamber 2 in the corresponding phase of the circuit breaker are spliced using a dislocation structure. Specifically, as shown in the appendix Figure 1 and 2 In this embodiment, the dislocation structure includes a raised step one 1a02 on one side of one of the two adjacent top covers 1a, 1a' and a raised step two 1a02' on the corresponding side of the other top cover. During the installation of the two adjacent top covers 1a, 1a', the raised step one 1a02 and the raised step two 1a02' are misaligned in the front-rear direction and are fitted and installed together in the front-rear direction to prevent arc particles from splashing from the assembly gap between the two adjacent top covers 1a, 1a'.

[0034] As shown in the appendix Figure 4 As shown, the installation screws 3 of the corresponding arc extinguishing chambers 2 in the corresponding phases of the common circuit breaker of the several top covers 1 are installed on the base 4 and the bottom plate 5 of the circuit breaker. Specifically, as shown in the appendix Figure 5 As shown, mounting holes 101 are provided on both the front and rear sides of the top cover 1. The mounting screws 3 install the top cover 1 on the base 4 and the bottom plate 5 of the circuit breaker through the mounting holes 101. As shown in the appendix Figure 6 As shown, the exhaust holes 1a01 and 1a01' provided on the left and right side surfaces of the top cover 1 are arranged in a staggered manner, which can prevent the arc between two adjacent top covers 1a and 1a' of two adjacent phases (i.e., the top cover 1a is one phase and the top cover 1a' is the other phase) from causing arc cross-over and thus resulting in phase-to-phase short circuit. Among them, as shown in the appendix Figure 1 If it is a three-phase AC circuit breaker with 2 poles in parallel for 1 phase, then the top cover 1a is one phase and the top cover 1a' is the other phase. The two top covers 1a and 1a' are adjacent, which can prevent the arc between the two top covers 1a and 1a' from causing arc cross-over and thus resulting in phase-to-phase short circuit.

[0035] At the same time, as shown in the appendix Figure 5 As shown, there is an exhaust hole 1a03 on the front end face of the top cover 1, which can assist in exhausting and dissipating heat, and prevent the top cover 1 from being damaged due to excessive pressure. In addition, as shown in the appendix Figure 7 As shown, guiding ribs 102 are provided on at least the upper side surface of the inner cavity of the several top covers 1 to guide the arc to move along a predetermined path. The guiding ribs extend in the left-right direction, and at least two guiding ribs are arranged in the front-rear direction, so that most of the arc is discharged from the exhaust holes 1a01 and 1a01' provided on the left and right side surfaces of the top cover 1 in the left-right direction. In this embodiment, the bracket 6 is located on the front side of the top cover 1 and can install the secondary terminal 7. It can also prevent the particles generated by breaking from entering the operating mechanism. The upper end face of the bracket 6 is preferably flush with the upper end face of the top cover 1. In addition, when there is an exhaust hole 1a03 on the lower side of the front end face of the several top covers 1 and the bracket 6 is located on the front side of the top cover 1, there is a gap between the exhaust hole 1a03 and the bracket 6.

[0036] In addition, the several top covers 1 are split type arc-proof plastic top covers. The split type plastic top cover, through special structural design (such as adding diversion grooves, adding isolation baffles, etc.), can effectively guide and limit the arc to self-extinguish inside it instead of splashing backward, reducing the safety hazard, improving the overall safety performance and service life of the equipment. It ensures the stable operation of the power system and also meets the requirements of the electrical equipment safety code

[0037] When the circuit breaker breaks, the split type arc-proof plastic top cover used in the frame circuit breaker has the following advantages specifically:

[0038] (1) Arc Blocking and Guidance: The arc-proof cover is designed with a guiding rib structure, which can guide the arc to move along a predetermined path when the arc is generated, rather than spraying randomly. It can effectively prevent the arc from damaging the electrical equipment outside the circuit breaker or causing harm to the operator.

[0039] (2) Insulating Barrier: The plastic material itself has good insulation performance. The split arc-proof cover forms an additional insulating layer at the moment when the contacts of the circuit breaker are separated, which helps to prevent the arc from spanning to the outside of the circuit breaker and protects the surrounding environment.

[0040] (3) Thermal Protection and Cooling: Although plastic is not a direct arc-extinguishing medium, some high-performance plastics have good high-temperature resistance and heat conduction performance, which can absorb and disperse the heat generated by the arc to a certain extent, assist in accelerating the cooling process in the arc area, and indirectly promote the extinction of the arc.

[0041] (4) Cooperating with the Arc Extinguishing System: As an external barrier, it forms a complete protection system together with the arc extinguishing system to ensure that the arc can be extinguished quickly and safely.

[0042] (5) The split cover can be disassembled separately, with convenient installation, low replacement and maintenance costs; the misaligned openings on both sides prevent phase-to-phase arc bridging and reignition.

[0043] (6) Wide universality, can be adapted to different models and specifications of circuit breakers, with high flexibility and universality.

[0044] In summary, the present utility model provides an installation structure for the top cover of a circuit breaker. The split arc-proof top cover structure makes the installation convenient, with low replacement and maintenance costs, strong universality, can be adapted to different models and specifications of circuit breakers, and has high flexibility and universality.

[0045] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0046] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A circuit breaker top cover mounting structure, characterized in that: A plurality of split top covers (1) are mounted above corresponding arc extinguishing chambers (2) in corresponding phases of a circuit breaker, and rear side end surfaces of two adjacent top covers (1a, 1a') of the plurality of top covers (1) mounted on corresponding arc extinguishing chambers (2) in corresponding phases of the circuit breaker are spliced ​​using a dislocation structure.

2. A circuit breaker top cover mounting structure according to claim 1, characterized in that: The plurality of top covers (1) are mounted on a base (4) and a bottom plate (5) of the circuit breaker using common mounting screws (3) of corresponding arc extinguishing chambers (2) in corresponding phases of the circuit breaker.

3. A circuit breaker top cover mounting structure according to claim 1, characterized in that: The exhaust holes (1a01, 1a01') on the left and right sides of the plurality of top covers (1) are arranged in a staggered manner.

4. A circuit breaker top cover mounting structure as claimed in claim 3, characterized in that: The front end surfaces of the plurality of top covers (1) are provided with exhaust holes (1a03).

5. A circuit breaker top cover mounting structure according to claim 1, characterized in that: The dislocation structure comprises a raised step 1 (1a02) on one side of one top cover among two adjacent top covers (1a, 1a') of a plurality of top covers (1) and a raised step 2 (1a02') on the corresponding side of the other top cover, wherein the raised step 2 (1a02') and the raised step 1 (1a02) are dislocated with each other in the front-to-back direction and are fitted together in the front-to-back direction.

6. A circuit breaker top cover mounting structure according to claim 1, characterized in that: At least the upper side surfaces of the inner cavities of the plurality of top covers (1) are provided with guide ribs (102) for guiding the electric arc to move along a predetermined path.

7. A circuit breaker top cover mounting structure according to claim 1, characterized in that: The bracket (6) is fixedly mounted on the base (4), the bracket (6) is located on the front side of the top cover (1), and the secondary terminal (7) is fixed on the bracket (6).

8. A circuit breaker top cover mounting structure according to claim 7, characterized in that: The upper end surface of the bracket (6) is flush with the upper end surfaces of the plurality of top covers (1).

9. A circuit breaker top cover mounting structure according to claim 1, characterized in that: The plurality of top covers (1) are split-type arc-blowout-proof plastic top covers.

10. A circuit breaker top cover mounting structure according to claim 7, characterized in that: An exhaust hole (1a03) is provided on the lower side of the front end surface of the plurality of top covers (1), the bracket (6) is located on the front side of the plurality of top covers (1), and there is a gap between the exhaust hole (1a03) and the bracket (6).

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