A plastic housing type circuit breaker cover and circuit breaker

Abstract

The utility model relates to a kind of plastic shell formula circuit breaker cover and circuit breaker, the cover includes multiple louvre accommodating spaces being arranged on the base, multiple louvres are arranged in each louvre accommodating space with interval;Wherein, the two sides of the louvre are provided with convex point, the side of the louvre in the louvre accommodating space is provided with convex point clamping part, the convex point is clamped by the convex point clamping part.Compared with prior art, the utility model is provided with convex point on the two sides of louvre, and the interference fit of the convex point of louvre and cover is used to offset part of horizontal load from wiring row and air blast impact, to achieve the purpose of protecting cover.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically to a plastic-cased circuit breaker housing and circuit breaker. Background Technology

[0002] Arc spatter is a phenomenon that may occur when a circuit breaker disconnects a circuit (especially a short-circuit fault). The high temperature, high-energy particles and electromagnetic effects generated can have many negative impacts on equipment, personnel and the environment, such as contact erosion and damage to the arc extinguishing system.

[0003] Currently, most circuit breakers on the market use arc-blocking enclosures to cool and absorb the ejected arc, thus limiting arc splashing. However, this ignores the fact that during high-voltage tests, molded case circuit breakers generate huge air waves, and the conductors are subjected to repulsive and attractive forces from electromagnetism. The enclosure structure cannot withstand the lateral load on it by the conductors and cracks.

[0004] Therefore, it is urgent to improve the existing molded case circuit breakers so that they can effectively block arcs and ensure the integrity of the casing when breaking high voltage circuits. Utility Model Content

[0005] To overcome the shortcomings of existing molded case circuit breaker switches, which cause conductors to repel or attract each other due to the large electrodynamic force during high-voltage breaking, thus damaging the casing, this utility model provides a more robust molded case circuit breaker casing that can prevent phase-to-phase short circuits and block splashed arcs during breaking.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] One of the technical solutions of this utility model is to provide a plastic-cased circuit breaker housing, which is disposed on a base at the terminal outlet of the plastic-cased circuit breaker. The housing includes...

[0008] Multiple grid plate receiving spaces are provided on the base, and multiple grid plates are spaced apart in each grid plate receiving space;

[0009] The grid plate has protrusions on both sides, and a protrusion clamping part is provided on the side of the grid plate accommodating space near the grid plate. The protrusions are clamped by the protrusion clamping part. When the molded case circuit breaker breaks, the conductor impacts and the air wave impacts the cover, and the cover deforms to both sides. The protrusions on both sides of the grid plate and the protrusion clamping part interact with each other, giving the cover an inward pulling force, effectively protecting the integrity of the cover and preventing phase-to-phase short circuits.

[0010] In some specific embodiments, the grid receiving space is formed by a pair of partitions spaced apart on the base and a pair of side plates disposed between the partitions.

[0011] In some specific embodiments, the side plate is provided with a reinforcing part that is connected to the base plate, and the reinforcing part is also nested with the molded case circuit breaker.

[0012] In some specific embodiments, the reinforcing part is horseshoe-shaped.

[0013] In some specific embodiments, the partition plate is provided with longitudinally extending holes, and reinforcing members are provided inside the holes.

[0014] In some specific embodiments, the partition sidewall is provided with a T-shaped block along its vertical direction, and inverted L-shaped blocks are provided on both sides of the T-shaped block. The T-shaped block and the inverted L-shaped blocks together form a protruding clamping part.

[0015] In some specific embodiments, the distance between the outermost end of the T-shaped block and the outermost end of the inverted L-shaped block is denoted as L1, and the distance between the protrusions on both sides of the grid plate is denoted as L2, satisfying L2>L1.

[0016] In some specific embodiments, each of the grid accommodating spaces contains three grids.

[0017] In some specific embodiments, the grid plate is provided with a plurality of perforations arranged asymmetrically along its longitudinal central axis.

[0018] In some specific embodiments, adjacent grids within each grid accommodating space are arranged in a mirror image configuration.

[0019] The second technical solution of this utility model is to provide a circuit breaker, which includes a plastic-cased circuit breaker housing as described in one of the above technical solutions.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] (1) This utility model provides protrusions on both sides of the grid plate. By using the interaction of forces, when the cover is deformed to both sides by air waves and lateral loads, the protrusions on the grid plate will contact the groove wall of the cover. It is necessary to overcome the force of grid plate deformation. Since the grid plate is made of steel, its tensile and compressive strength is much higher than that of plastic cover, which will inhibit the cover from deforming to both sides and achieve the purpose of protecting the cover.

[0022] (2) The present invention has a horseshoe-shaped reinforcing part inside the cover, which is an unconventional reinforcing rib design that effectively increases the strength of the cover.

[0023] (3) Within a controllable cost range, the damage to the enclosure is reduced, ensuring the functionality and aesthetics of the enclosure, and improving the stability and reliability of the circuit breaker under high current. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the circuit breaker of this utility model.

[0025] Figure 2 This is a left view of the circuit breaker of this utility model.

[0026] Figure 3 This is a schematic diagram of the structure of the plastic-cased circuit breaker housing of this utility model.

[0027] Figure 4 This is a top view of the housing of the plastic-cased circuit breaker of this utility model.

[0028] Figure 5 This is a schematic diagram of the structure of the grid plates in the housing of the plastic-cased circuit breaker of this utility model.

[0029] Figure 6 This is a front view of the grid plates in the housing of the plastic-cased circuit breaker of this utility model.

[0030] Figure 7 This is a side view of the grid plates in the housing of the plastic-cased circuit breaker of this utility model.

[0031] Figure 8 This is a schematic diagram showing the dimensions of the protrusion clamping part and the grid plate in the housing of the plastic-cased circuit breaker of this utility model.

[0032] The numbers in the diagram indicate: 1 is a molded case circuit breaker, 2 is the casing, 21 is the reinforcing part, 22 is the side plate, 23 is the partition, 24 is the hole, 25 is the protrusion clamping part, 2501 is the inverted L-shaped block, 2502 is the T-shaped block, 3 is the grid plate, 31 is the perforation, 32 is the protrusion, and 4 is the base. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0036] In the following embodiments, unless otherwise specified, the functional components or structures are conventional components or structures used in the art to achieve the corresponding functions.

[0037] Example 1

[0038] like Figures 1-8 As shown, this embodiment provides a plastic case circuit breaker housing, which is located on a base 4 at the terminal of the plastic case circuit breaker 1. The housing 2 includes multiple grid receiving spaces provided on the base 4, and multiple grids 3 are spaced apart in each grid receiving space.

[0039] The grid plate 3 has protrusions 32 on both sides, and a protrusion clamping part 25 is provided on the side of the grid plate accommodating space near the grid plate 3, so that the protrusions 32 are clamped by the protrusion clamping part 25.

[0040] When a molded case circuit breaker interrupts high voltage and high current, the current in the conductors at the terminals is opposite (or the same), which causes an electric repulsion (attraction) between adjacent phases. This results in conductor impact and air blast impact on the housing 2, causing the housing 2 to deform to both sides. This technical solution uses the interaction of forces between the protrusions 32 on both sides of the grid plate 3 and the protrusion clamping part 25 to give the housing 2 an inward pulling force, effectively protecting the integrity of the housing 2 and preventing phase-to-phase short circuits.

[0041] like Figure 3 The grid space is formed by a pair of partitions 23 spaced apart on the base 4 and a pair of side plates 22 between the partitions 23. The side plates 22 are provided with reinforcing portions 21 connected to the base 4, and these reinforcing portions 21 are also nested within the molded case circuit breaker 1. More preferably, the reinforcing portion 21 is horseshoe-shaped. When the molded case circuit breaker performs high-voltage, high-current interruption, the opposite (or identical) current in the conductors at the terminals causes an electrodynamic repulsion (attraction) between adjacent phases, leading to cracking of the base 4. Therefore, this technical solution, through the design of an unconventional reinforcing structure, with the horseshoe-shaped reinforcing portion 21 perfectly nested within the molded case circuit breaker, effectively increases the local structural strength of the housing 2. When the conductors move to the sides due to repulsion or approach due to attraction, the base 4 is less likely to be damaged, thus also enhancing the strength of the housing 2 and preventing damage to the housing 2 from conductors and air currents.

[0042] like Figures 3-4 As shown in Figure 8, the partition 23 has longitudinally extending holes 24, and a reinforcing member, such as a screw, is installed inside the holes 24. Since the cover 2 is generally made of plastic, it is prone to deformation and damage when subjected to impact. When a screw is installed inside the holes 24, the stronger screw can effectively prevent the wire from hitting the partition 23 and causing the cover 2 to crack. Figures 3-48. The sidewall of the partition 23 is provided with a T-shaped block 2502 along its vertical direction. Inverted L-shaped blocks 2501 are provided on both sides of the T-shaped block 2502. The T-shaped block 2502 and the inverted L-shaped blocks 2501 together form a protrusion clamping part 25. The distance between the outermost end of the T-shaped block 2502 and the outermost end of the inverted L-shaped block 2501 is denoted as L1, and the distance between the protrusions 32 on both sides of the grid plate 3 is denoted as L2, satisfying L2>L1. Through the elasticity of the protrusion clamping part 25, when the grid plate 3 is inserted from top to bottom, L1>L2 is satisfied, ensuring that the grid plate 3 can be smoothly inserted. However, since L1<L2 in its natural state, after the grid plate 3 is inserted, it can achieve an interference fit with the protrusion clamping part 25 to limit the grid plate 3 within the grid plate receiving space, thereby avoiding deformation of the grid plate receiving space and effectively protecting the integrity of the cover 2.

[0043] like Figure 3 As shown, each of the grid plate accommodating spaces contains 3 grid plates 3.

[0044] like Figures 5-7 As shown, the grid plate 3 is asymmetrically arrayed with several perforations 31 along its longitudinal central axis. The adjacent grid plates 3 within the accommodating space of each grid plate are mirror images, that is, one of the adjacent grid plates 3 is rotated 180° laterally along its longitudinal central axis. The adjacent grid plates 3 are either face-to-face or back-to-back, so that the perforations 31 between the grid plates 3 are misaligned, thereby better limiting the electric arc.

[0045] Example 2

[0046] This embodiment provides a circuit breaker, such as Figure 1 and 2 As shown, it includes a plastic-cased circuit breaker housing as described in Example 1.

[0047] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A plastic-cased circuit breaker housing, disposed on a base (4) at the terminal of a plastic-cased circuit breaker (1), characterized in that, The enclosure (2) includes: Multiple grid plate receiving spaces are provided on the base (4), and multiple grid plates (3) are spaced apart in each grid plate receiving space; The grid plate (3) has protrusions (32) on both sides, and a protrusion clamping part (25) is provided on the side of the grid plate accommodating space near the grid plate (3) to clamp the protrusions (32).

2. The plastic-cased circuit breaker housing according to claim 1, characterized in that, The grating space is formed by a pair of partitions (23) spaced apart on the base (4) and a pair of side plates (22) spaced between the partitions (23).

3. The plastic-cased circuit breaker housing according to claim 2, characterized in that, The side plate (22) is provided with a reinforcing part (21) connected to the base (4), and the reinforcing part (21) is also nested with the molded case circuit breaker (1).

4. The plastic-cased circuit breaker housing according to claim 3, characterized in that, The reinforcing part (21) is horseshoe-shaped.

5. A plastic-cased circuit breaker housing according to claim 3, characterized in that, The partition (23) has longitudinally extending holes (24), and a reinforcing member is provided inside the holes (24).

6. The plastic-cased circuit breaker housing according to claim 2, characterized in that, The partition (23) has a T-shaped block (2502) on its side wall along its vertical direction. The T-shaped block (2502) has an inverted L-shaped block (2501) on both sides. The T-shaped block (2502) and the inverted L-shaped block (2501) together form a protrusion clamping part (25).

7. A plastic-cased circuit breaker housing according to claim 6, characterized in that, The distance between the outermost end of the T-shaped block (2502) and the outermost end of the inverted L-shaped block (2501) is denoted as L1, and the distance between the protrusions (32) on both sides of the grid plate (3) is denoted as L2, satisfying L2>L1.

8. The plastic-cased circuit breaker housing according to claim 1, characterized in that, The grid plate (3) is provided with a plurality of perforations (31) arranged asymmetrically along its longitudinal central axis.

9. A plastic-cased circuit breaker housing according to claim 8, characterized in that, The two adjacent grids (3) within each grid space are mirror images.

10. A circuit breaker, characterized in that, It includes the plastic-cased circuit breaker housing as described in any one of claims 1-9.

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