A plastic-cased circuit breaker housing and circuit breaker

Abstract

This utility model relates to a plastic-cased circuit breaker housing and a circuit breaker itself. The housing includes multiple grid receiving spaces on a base, with multiple grids spaced apart within each space. Several clamping portions for holding the grids are provided on the opposite inner walls of each grid receiving space. Each grid includes a Z-shaped portion, which includes a first fold and a second fold connected to opposite ends of the first fold and extending in opposite directions. A protrusion on the first fold, near the second fold, is located opposite to the extension direction of the second fold. The clamping portions include a second limiting block and a first limiting block for forming and limiting the space of the second fold. Compared with the prior art, this utility model's circuit breaker can effectively protect the integrity of the housing and prevent phase-to-phase short circuits during disconnection.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular 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] Most molded case circuit breakers on the market currently have enclosures that can cool and absorb the arc emitted during breaking, thus limiting arc spatter. However, when molded case circuit breakers are tested at high voltage, the large electrodynamic force generates a huge air wave during breaking, and the electrodynamic repulsion (attraction) can damage the enclosure, thus failing to prevent arc spatter.

[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] The purpose of this invention is to overcome the problem that the molded case circuit breaker housing will be damaged during high-voltage breaking, thus failing to achieve the function of arc blocking and preventing phase-to-phase short circuits during breaking, thereby providing a molded case circuit breaker housing and circuit breaker.

[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 case circuit breaker housing, which is provided on a base at the terminal of the plastic case circuit breaker. The housing includes a plurality of grid plate receiving spaces provided on the base. Each grid plate receiving space is provided with a plurality of grid plates spaced apart. The relative inner sidewalls of the grid plate receiving spaces are provided with a plurality of clamping parts for clamping the grid plates.

[0008] The grid plate includes a Z-shaped portion, which includes a first fold and a second fold that is connected to the opposite ends of the first fold and extends in opposite directions. A protrusion is provided on the first fold near the second fold, opposite to the extension direction of the second fold.

[0009] The clamping part includes a second limiting block and a first limiting block for forming a space that limits the second fold, and the opening of the limiting space formed by the second limiting block and the first limiting block is also interference-engaged with the protrusion and the first fold.

[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, 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 grating further includes a profile connected to the first fold, and the first fold and the profile are provided with a plurality of perforations arranged asymmetrically along the central axis of the grating.

[0014] In some specific embodiments, adjacent grids within each grid accommodating space are arranged in a mirror image configuration.

[0015] In some specific embodiments, the opening distance H1 of the limiting space formed by the second limiting block and the first limiting block and the sum of the thicknesses H2 of the protrusion and the first fold satisfy: H1≤H2.

[0016] In some specific embodiments, within the grating space, the distance L2 between the nearest inner wall of the limiting space formed by the second limiting block and the first limiting block on the two gratings and the distance L1 between the inner walls of the second fold at both ends of the first fold satisfy: L1≤L2.

[0017] In some specific embodiments, the partition plate is provided with longitudinally extending holes, and reinforcing members are provided inside the holes.

[0018] In some specific embodiments, each of the grid accommodating spaces contains three grids.

[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 beneficial effects:

[0021] (1) When the circuit breaker breaks, the casing is deformed to both sides due to the impact of the conductor. This utility model assembles the grid plate inside the casing so that the bent ends of the Z-shaped part of the grid plate can abut against the limiting space formed on the inner wall of the casing. Since the force is mutual, when the clamping part on the inner wall of the casing is deformed, it is also necessary to overcome the force of the Z-shaped part deforming to both sides, so that the clamping part cannot deform to both sides, thereby offsetting part of the destructive force of the conductor and air wave on the casing, thus avoiding the casing from deforming, effectively protecting the integrity of the casing, and preventing the occurrence of phase-to-phase short circuit.

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

[0023] Figure 1 This is a schematic diagram of the circuit breaker of this utility model.

[0024] Figure 2 This is a left view of the circuit breaker of this utility model.

[0025] Figure 3 This is a schematic diagram of the structure of the plastic-cased circuit breaker housing of this utility model.

[0026] Figure 4 This is a top view of the housing of the plastic-cased circuit breaker of this utility model.

[0027] Figure 5 This is a side top view of the housing of the plastic-cased circuit breaker of this utility model.

[0028] Figure 6 This is a schematic diagram showing the dimensions of the limiting space within the grid space of the plastic-cased circuit breaker housing of this utility model.

[0029] Figure 7 This is a schematic diagram showing the dimensions of the grid plates in the housing of the plastic-cased circuit breaker of this utility model.

[0030] Figure 8 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.

[0031] The diagram is labeled as follows:

[0032] 1 is a molded case circuit breaker, 2 is a housing, 21 is a side plate, 22 is a reinforcing part, 23 is a partition, 24 is a hole, 25 is a clamping part, 2501 is a first limiting block, 2502 is a second limiting block, 3 is a grid plate, 31 is a Z-shaped part, 311 is a first fold, 312 is a second fold, 32 is a protrusion, 33 is a type part, 34 is a perforation, and 4 is a base. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. This embodiment is based on the technical solution of the present invention and provides 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-cased circuit breaker housing, which is installed on a base 4 at the terminal of the plastic-cased circuit breaker 1. The housing 2 includes: a plurality of grid plate receiving spaces provided on the base 4, each of the grid plate receiving spaces having a plurality of grid plates 3 spaced apart, and a plurality of clamping parts 25 for clamping the grid plates 3 provided on the opposite inner sidewalls of the grid plate receiving spaces.

[0039] The grid plate 3 includes a Z-shaped portion 31, which includes a first fold 311 and a second fold 312 that are connected to opposite ends of the first fold 311 and extend in opposite directions. The first fold 311 has a protrusion 32 near the second fold 312 that is opposite to the extension direction of the second fold 312.

[0040] The clamping part 25 includes a second limiting block 2502 and a first limiting block 2501 for forming a space that limits the second fold 312. The opening of the limiting space formed by the second limiting block 2502 and the first limiting block 2501 is also interference-engaged with the protrusion 32 and the first fold 311.

[0041] When the molded case circuit breaker 1 interrupts high voltage and high current, the current direction of the conductors at the terminals is opposite (same), which causes an electrodynamic repulsion (attraction) between adjacent phases. Furthermore, a huge air blast is generated inside the molded case circuit breaker 1 during interruption, causing the inner wall of the casing 2 to crack and resulting in a short circuit between adjacent phases. In this technical solution, multiple grid spacers are designed inside the casing 2, and multiple grids 3 are spaced apart within each grid spacer. The grid spacer clamping part 25 can limit and clamp the Z-shaped part 31 of the grids 3, thereby preventing deformation of the grid spacer and effectively protecting the integrity of the casing 2.

[0042] like Figure 3As shown, the grid receiving space is formed by a pair of partitions 23 spaced apart on the base 4 and a pair of side plates 21 disposed between the partitions 23. The side plates 21 are provided with reinforcing portions 22 connected to the base 4, and the reinforcing portions 22 are also used for nesting with the molded case circuit breaker 1 with a gap. Preferably, the reinforcing portions 22 are horseshoe-shaped. Since the side plates 21 and the base 4 can be damaged when the molded case circuit breaker 1 performs high-voltage, high-current interruption, this technical solution designs an unconventional reinforcing structure. When the conductor moves to both sides due to repulsion or approaches due to attraction, the side plates 21 and the base 4 are not easily damaged, thereby also enhancing the strength of the casing body 2 and preventing damage to the casing body 2 from the conductor and air currents.

[0043] like Figures 3-5 As shown in Figure 8, the grid plate 3 also includes a type part 33 connected to the first fold 311. The first fold 311 and the type part 33 are provided with a plurality of perforations 34 asymmetrically arranged along the central axis of the grid plate 3. The adjacent grid plates 3 in each grid plate accommodating space are mirror images, that is, one of the adjacent grid plates 3 is rotated 180° laterally along its central axis. The adjacent grid plates 3 are either face-to-face or back-to-back, so that the perforations 34 between the grid plates 3 are misaligned, thereby better limiting the electric arc.

[0044] Considering space constraints, in this embodiment, each of the grid sheet accommodating spaces contains 3 grid sheets 3.

[0045] like Figures 3-7 As shown, the opening distance H1 of the limiting space formed by the second limiting block 2502 and the first limiting block 2501 and the sum of the thicknesses H2 of the protrusion 32 and the first fold 311 satisfy: H1≤H2. More preferably, the range of H1 being less than H2 is 0.1 to 0.2 mm.

[0046] The distance L2 between the nearest inner wall of the limiting space formed by the second limiting block 2502 and the first limiting block 2501 on the two relative grid plates 3 and the distance L1 between the inner walls of the second fold 312 at both ends of the first fold 311 satisfy: L1≤L2. More preferably, the range of L1 being less than L2 is 0.1 to 0.2 mm.

[0047] In this technical solution, by inserting the grid plate 3 into the clamping part 25 from top to bottom, the grid plate 3 is limited in the grid plate receiving space through the interference fit between the clamping part 25 and the Z-shaped part 31, thereby avoiding deformation of the grid plate receiving space and effectively protecting the integrity of the cover 2.

[0048] like Figures 3-4As shown, the partition 23 has a longitudinally extending hole 24, and a reinforcing member is provided inside the hole 24. The reinforcing member can be a screw. Since the cover is generally made of plastic, it is easy to deform and be damaged when it is impacted. When a screw is placed inside the hole 24, the stronger screw can effectively prevent the wire from hitting the partition 23 and causing the cover to crack.

[0049] Example 2:

[0050] 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.

[0051] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. A plastic housing circuit breaker cover, which is arranged on a base (4) at a terminal of a molded case circuit breaker (1), characterized in that, The cover (2) includes multiple grid plate receiving spaces provided on the base (4), and multiple grid plates (3) are spaced apart in each grid plate receiving space. Several clamping parts (25) for clamping the grid plates (3) are provided on the opposite inner sidewalls of the grid plate receiving space. The grid plate (3) includes a Z-shaped portion (31), which includes a first fold (311) and a second fold (312) that is connected to the opposite ends of the first fold (311) and extends in opposite directions. The first fold (311) has a protrusion (32) on it near the second fold (312) that is opposite to the extension direction of the second fold (312). The clamping part (25) includes a second limiting block (2502) and a first limiting block (2501) for forming a space that limits the second fold (312). The opening of the limiting space formed by the second limiting block (2502) and the first limiting block (2501) is also interference-engaged with the protrusion (32) and the first fold (311).

2. The plastic housed circuit breaker cover of claim 1, wherein, The grating space is formed by a pair of partitions (23) spaced apart on the base (4) and a pair of side plates (21) spaced between the partitions (23).

3. The plastic housed circuit breaker enclosure of claim 2, wherein, The side plate (21) is provided with a reinforcing part (22) connected to the base (4), and the reinforcing part (22) is also nested with the molded case circuit breaker (1).

4. The plastic housed circuit breaker enclosure of claim 3, wherein, The reinforcing part (22) is horseshoe-shaped.

5. The plastic-housed circuit breaker enclosure of claim 1, wherein, The grating (3) also includes a type part (33) connected to the first fold (311), and the first fold (311) and the type part (33) are provided with a plurality of perforations (34) arranged asymmetrically along the central axis of the grating (3).

6. The plastic housed circuit breaker enclosure of claim 5, wherein, The two adjacent grids (3) within each grid space are mirror images.

7. The plastic-housed circuit breaker enclosure of claim 1, wherein, The opening distance H1 of the limiting space formed by the second limiting block (2502) and the first limiting block (2501) and the sum of the thickness H2 of the protrusion (32) and the first fold (311) satisfy: H1≤H2.

8. The plastic-housed circuit breaker enclosure of claim 1, wherein, Within the grating space, the distance L2 between the nearest inner wall of the limiting space formed by the second limiting block and the first limiting block on the two gratings and the distance L1 between the inner walls of the second fold at both ends of the first fold satisfy: L1≤L2.

9. The plastic-housed circuit breaker enclosure of claim 2, wherein, The partition (23) is provided with longitudinally extending holes (24), and a reinforcing member is provided inside the holes (24).

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

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