Arc extinguishing chamber of circuit breaker

Abstract

The utility model belongs to the field of electrical technology, and particularly relates to an arc extinguishing chamber of a circuit breaker, which comprises a circuit breaker shell and further comprises a supporting frame which is arranged in the circuit breaker shell and comprises supporting plates arranged oppositely and a connecting plate connected with the supporting plates on the two sides; the arc extinguishing grid plates are arranged between the supporting plates on the two sides and arranged in the height direction of the supporting plates, and arc striking grooves are formed in the arc extinguishing grid plates; the locking unit comprises clamping blocks arranged on the two sides of the arc extinguishing grid piece, clamping grooves formed in the supporting plate and matched with the clamping blocks in a clamped mode, and elastic lock tongues arranged in the clamping grooves, the free ends of the elastic lock tongues are used for allowing the clamping blocks to pass through, and the free ends of the elastic lock tongues abut against the clamping blocks matched with the clamping grooves when reset so as to prevent the clamping blocks from being separated from the clamping grooves. According to the utility model, the locking units of the clamping blocks, the clamping grooves and the elastic lock tongues are utilized to realize clamping and anti-falling, and the arc extinguishing grid sheets can be assembled conveniently and reliably fixed.

Description

Technical Field

[0001] This utility model belongs to the field of electrical technology, and specifically refers to an arc-extinguishing cover for a circuit breaker. Background Technology

[0002] High-voltage DC circuit breakers are key equipment in power systems, mainly used in high-voltage DC transmission and distribution networks to connect and disconnect circuits. They can quickly cut off current when a fault occurs, prevent the fault from escalating, and ensure the safe and stable operation of the power system.

[0003] Existing technologies for fixing arc-extinguishing grids have significant shortcomings. For example, some designs use riveting to fix the grids to the side plates, requiring precise alignment of the riveting points during installation, which is cumbersome, inefficient, and prone to affecting structural stability due to assembly errors. Others use simple snap-fit ​​structures for fixing, lacking effective anti-detachment mechanisms. Under arc impact or equipment vibration, the grids are prone to loosening or even falling off, leading to a decrease in arc-extinguishing performance. Therefore, there is an urgent need for an arc-extinguishing cover that allows for convenient assembly and reliable fixing of the arc-extinguishing grids. Utility Model Content

[0004] This invention utilizes a locking unit consisting of a locking block, a locking groove, and an elastic locking tongue to achieve locking and anti-detachment, enabling convenient assembly and reliable fixation of the arc-extinguishing grid plate, thereby solving the problems mentioned in the background art.

[0005] The purpose of this utility model is achieved as follows: an arc-extinguishing cover for a circuit breaker, including a circuit breaker housing, further comprising:

[0006] The support frame is installed inside the circuit breaker housing and includes support plates arranged opposite each other and a connecting plate connecting the two support plates.

[0007] An arc-extinguishing grid is disposed between two support plates and arranged along the height direction of the support plates. The arc-extinguishing grid is provided with an arc-inducing groove.

[0008] The locking unit includes locking blocks on both sides of the arc-extinguishing grid plate, a locking groove on the support plate that engages with the locking blocks, and an elastic locking tongue in the locking groove with its free end for the locking blocks to pass through. When the free end of the elastic locking tongue is reset, it abuts against the locking block that engages with the locking groove to prevent it from disengaging from the locking groove.

[0009] The present invention is further configured such that the elastic locking tongue is made of engineering plastic.

[0010] The present invention is further configured such that the elastic locking tongue and the support plate are integrally injection molded.

[0011] The present invention is further configured such that the arc-quenching grid sheet comprises:

[0012] The upper grid plate is located on the upper part of the support frame and is arranged in an inclined upward direction;

[0013] The lower grid plate is located at the lower part of the support frame and is arranged in an inclined downward direction.

[0014] The present invention is further configured such that the upper grid plate and the lower grid plate form a V-shaped angle.

[0015] The present invention is further provided that the bottom surface of the upper grid plate and the top surface of the lower grid plate are provided with arc-extinguishing teeth, which are perpendicular to the support plate and arranged at intervals.

[0016] The present invention is further configured such that the radial cross-section of the arc-extinguishing tooth is triangular.

[0017] By adopting the above technical solution, the beneficial effects that this utility model can achieve are:

[0018] 1. By using the side locking block of the arc-extinguishing grid plate to cooperate with the slot of the support plate, and the elastic locking tongue in the slot to allow the locking block to pass through and then reset and abut, the grid plate assembly can be completed without complicated riveting or disassembly operations, which simplifies the installation process and improves the assembly efficiency.

[0019] 2. The anti-disengagement structure of the locking block after the elastic locking tongue is reset ensures that the locking block is stably locked in the slot, preventing the grid plate from shifting due to arc impact or equipment vibration, thus improving the reliability of the arc extinguishing grid plate fixing.

[0020] 3. By regularly arranging the arc-extinguishing grid plates with a support frame, and combining the arc-guiding grooves on the grid plates to guide the arc, no additional grid plate installation space is required, ensuring the normal layout of the grid plates and the arc handling effect, thus improving the arc-extinguishing performance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the circuit breaker housing of this utility model;

[0022] Figure 2 This is a three-dimensional structural diagram of the arc-extinguishing cover of this utility model;

[0023] Figure 3 This utility model Figure 2 Side view;

[0024] Figure 4 This is a schematic diagram of the arc-extinguishing grid sheet of this utility model.

[0025] The attached figures are labeled as follows: 1. Circuit breaker housing; 2. Support frame; 20. Support plate; 21. Connecting plate; 3. Arc extinguishing grid; 30. Upper grid; 31. Lower grid; 4. Arc ignition groove; 5. Locking unit; 50. Locking block; 51. Locking groove; 52. Elastic locking tongue; 6. Arc extinguishing tooth. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-4 :

[0027] Example 1:

[0028] This embodiment provides an arc-extinguishing cover for a circuit breaker, including a circuit breaker housing 1, and further comprising:

[0029] The support frame 2 is installed inside the circuit breaker housing 1 and includes a support plate 20 arranged opposite to each other and a connecting plate 21 connecting the two support plates 20.

[0030] An arc-extinguishing grid plate 3 is disposed between two support plates 20 and arranged along the height direction of the support plates 20. The arc-extinguishing grid plate 3 is provided with an arc-inducing groove 4.

[0031] The locking unit 5 includes locking blocks 50 disposed on both sides of the arc-extinguishing grid plate 3, a locking groove 51 disposed on the support plate 20 and engaging with the locking blocks 50, and an elastic locking tongue 52 disposed in the locking groove 51 with its free end for the locking blocks 50 to pass through. When the free end of the elastic locking tongue 52 is reset, it abuts against the locking blocks 50 engaging with the locking groove 51 to prevent them from disengaging from the locking groove 51.

[0032] The support frame 2 is installed inside the circuit breaker housing 1, serving to support and fix components such as the arc-extinguishing grid 3. It includes opposing support plates 20, which are generally flat and provide a vertical mounting base for the arc-extinguishing grid 3; and connecting plates 21, which are mostly flat and are fixed to the support plates 20 by bolts or integral molding, connecting the two support plates 20 into a stable frame structure to ensure the stability of the entire support frame 2.

[0033] The arc-extinguishing grid plate 3 is installed between the two support plates 20 via the locking unit 5, and is arranged in an orderly manner along the height direction of the support plates 20. It is generally a sheet structure, and its surface is provided with an arc-initiating groove 4. The arc-initiating groove 4 is generally a long strip groove structure, the function of which is to guide the electric arc into the area of ​​the arc-extinguishing grid plate 3, so as to facilitate subsequent arc segmentation, cooling and extinguishing operations.

[0034] The locking unit 5 is used to fix the arc-extinguishing grid plate 3. The locking blocks 50 are located on both sides of the arc-extinguishing grid plate 3, and are mostly block-shaped protrusions, integrally formed with the arc-extinguishing grid plate 3 or fixed by welding, etc., for engaging with the locking grooves 51 on the support plate 20. The locking grooves 51 are formed on the support plate 20, and their shape is adapted to the locking blocks 50, providing a locking position for the locking blocks 50. The elastic locking tongue 52 is located inside the locking groove 51, and is usually made of elastic material. One end of the elastic locking tongue 52 is fixed to the end of the locking groove 51, and the free end can elastically deform under force. When the locking block 50 is inserted into the locking groove 51, the free end deforms under force to allow the locking block 50 to pass through, and then the free end returns to its original position to abut against the locking block 50, preventing it from dislodging from the locking groove 51, thereby achieving a stable installation of the arc-extinguishing grid plate 3 on the support plate 20.

[0035] In the above design, when the circuit breaker breaks the circuit and generates an arc, the arc moves towards the arc extinguishing shroud. The arc-initiating groove 4 on the arc extinguishing grid 3 guides the arc into the area of ​​the arc extinguishing grid 3. The arc extinguishing grid 3 divides the arc into multiple segments and accelerates the cooling of the arc through its own thermal conductivity. During this process, the locking blocks 50 on both sides of the arc extinguishing grid 3 are pre-engaged with the locking slots 51 on the support plate 20. The elastic locking tongue 52 in the locking slot 51 undergoes elastic deformation under force when the locking block 50 is inserted, allowing the locking block 50 to smoothly enter the locking slot 51. After the locking block 50 is in place, the free end of the elastic locking tongue 52 resets and tightly abuts against the locking block 50, restricting the movement of the locking block 50 in the locking slot 51 and preventing the arc extinguishing grid 3 from shifting due to arc impact or equipment vibration. Meanwhile, the support frame 2 provides an installation base for the arc-extinguishing grid plate 3 through the stable structure of the two side support plates 20 and the connecting plate 21. Combined with the anti-detachment effect of the locking unit 5, it ensures that the arc-extinguishing grid plate 3 always maintains the preset arrangement position, so that the arc-extinguishing grid plate 3 can continuously and stably divide and cool the arc, and ensure the effective advancement of the arc extinguishing process.

[0036] The elastic locking tongue 52 is made of engineering plastic. The purpose of the above design is to ensure that the elastic locking tongue 52 can smoothly undergo elastic deformation to avoid the blocking block 50 when the arc-extinguishing grid plate 3 is inserted into the slot 51 by using engineering plastic to make the elastic locking tongue 52. After the blocking block 50 is in place, it can reliably reset and abut against the blocking block 50 to prevent it from falling off. At the same time, engineering plastic has good insulation properties, which can prevent the elastic locking tongue 52 from affecting the insulation environment inside the arc-extinguishing chamber due to conductivity. It also has a certain mechanical strength and aging resistance, which can maintain the structural stability and elastic function of the locking tongue during the long-term use of the circuit breaker, ensuring the durability of the fixing effect of the locking unit 5 on the arc-extinguishing grid plate 3, and thus ensuring that the arc-extinguishing grid plate 3 always stably performs its arc-extinguishing function.

[0037] The elastic locking tongue 52 and the support plate 20 are integrally injection molded. The purpose of the above design is to eliminate the need for separate processing and assembly of the elastic locking tongue 52 and the support plate 20 by integrally injection molding, thereby reducing the number of parts and assembly steps and avoiding possible connection gaps or positional deviations during assembly. At the same time, the integral molding structure allows the elastic locking tongue 52 and the support plate 20 to form a stable whole, eliminating weak points in the connection between them and preventing the elastic locking tongue 52 from detaching from the support plate 20 due to vibration, arc impact, or other factors during long-term use, thus ensuring the structural stability of the locking unit 5. In addition, this molding method can also ensure the accurate positioning of the elastic locking tongue 52 on the support plate 20, making the cooperation between the locking tongue and the slot 51 and the locking block 50 more reliable, further improving the fixing effect on the arc extinguishing grid plate 3, maintaining the stable arrangement of the arc extinguishing grid plate 3, and ensuring the smooth progress of the arc extinguishing process.

[0038] The arc-extinguishing grid 3 includes an upper grid 30 and a lower grid 31. The upper grid 30 is located on the upper part of the support frame 2 and is arranged in an inclined upward direction. The lower grid 31 is located on the lower part of the support frame 2 and is arranged in an inclined downward direction. The purpose of the above design is to divide the arc-extinguishing grid 3 into an upper grid 30 and a lower grid 31, both of which are sheet-like structures adapted to the installation of the support frame 2. Both are connected and fixed to the support plates 20 on both sides of the support frame 2 through locking units 5. At the same time, the upper grid 30 located on the upper part of the support frame 2 is arranged in an inclined upward direction, and the lower grid 31 located on the lower part of the support frame 2 is arranged in an inclined downward direction. This makes the two types of grids form a guiding channel with openings facing the moving and stationary contacts of the circuit breaker. This ensures that when the circuit breaker breaks the circuit and generates an arc, the arc can be more smoothly introduced into the area of ​​the arc-extinguishing grid 3, avoiding the arc from being stuck due to obstructed path. At the same time, the inclined layout allows the grid to make more full contact with the arc, creating favorable conditions for subsequent arc segmentation and cooling, and ensuring the progress of the arc extinguishing process.

[0039] The upper grid plate 30 and the lower grid plate 31 form a V-shaped angle. The purpose of this design is to create a V-shaped angle between the upper grid plate 30, located on the upper part of the support frame 2 and inclined upwards, and the lower grid plate 31, located on the lower part of the support frame 2 and inclined downwards. This V-shaped angle design ensures that the entrance to the arc-extinguishing chamber is directly opposite the starting point of the arc generation when the moving and stationary contacts break, conforming to the natural law of the arc moving upwards under the influence of an electromagnetic field. The inclined upward layout of the upper grid plate 30 facilitates the reception and guidance of the upward-moving arc, while the lower grid plate 31 effectively captures and divides arc branches that may spread downwards, thus achieving comprehensive guidance and constraint of the arc. Simultaneously, the V-shaped angle layout allows the upper grid plate 30 and the lower grid plate 31 to form a wrapping contact with the arc from different directions, increasing the contact area between the arc and the grid plates. This provides more sufficient contact conditions for subsequent grid plate segmentation and arc cooling, reducing the risk of arc escape and ensuring the stable operation of the arc-extinguishing process.

[0040] Both the bottom surface of the upper grid plate 30 and the top surface of the lower grid plate 31 are provided with arc-extinguishing teeth 6, which are perpendicular to the support plate 20 and arranged at intervals. The purpose of the above design is to enable the arc-extinguishing teeth 6 to function synchronously with the arc-extinguishing grid plate 3 by providing arc-extinguishing teeth 6 on the bottom surface of the upper grid plate 30 and the top surface of the lower grid plate 31. These arc-extinguishing teeth 6 are protruding structures perpendicular to the support plate 20 and arranged at intervals, and are integrally formed with the corresponding arc-extinguishing grid plate 3 or firmly connected by a fixed connection. Traditional arc-extinguishing grid plates 3 only divide the arc in the vertical direction, while the arc-extinguishing teeth 6 of this design form an additional dividing barrier in the horizontal direction. When the electric arc enters the V-shaped channel formed by the upper grid plate 30 and the lower grid plate 31, the arc-extinguishing teeth 6 perpendicular to the support plate 20 can form multiple dividing barriers on the electric arc in the horizontal direction. Combined with the dividing effect of the arc-extinguishing grid plate 3 in the vertical direction, the electric arc is more finely broken up. At the same time, the spaced arc-extinguishing teeth 6 can significantly increase the contact area with the electric arc, accelerate the dissipation of arc heat, further improve the cooling effect, and prevent the electric arc from being difficult to extinguish due to insufficient division and cooling, thus ensuring the progress of the arc extinguishing process and maintaining the stable arc extinguishing performance of the arc extinguishing shroud.

[0041] The radial cross-section of the arc-extinguishing tooth 6 is triangular. The purpose of this design is to utilize the inherent wedge-like characteristics of the triangular structure to allow the arc-extinguishing tooth 6 to more precisely cut into the arc when in contact with it, thereby enhancing the arc-segmentation capability and allowing the arc to be more finely broken down into smaller segments in the horizontal direction. Simultaneously, compared to other cross-sectional shapes, the triangular cross-section of the arc-extinguishing tooth 6 creates a sharper contact edge within the same installation space, more effectively guiding the arc energy dispersion. Combined with the spaced arrangement of the arc-extinguishing teeth 6, this further accelerates the conduction and dissipation of arc heat, preventing prolonged extinguishing time due to insufficient segmentation and slow cooling, ensuring a stable arc-extinguishing process, and maintaining the arc-extinguishing shroud's effectiveness in handling the arc.

[0042] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. An arc-extinguishing cover for a circuit breaker, comprising a circuit breaker housing (1), characterized in that... It also includes: The support frame (2) is installed inside the circuit breaker housing (1) and includes a support plate (20) arranged opposite to each other and a connecting plate (21) connecting the two support plates (20). An arc-extinguishing grid plate (3) is disposed between two support plates (20) and arranged along the height direction of the support plates (20). The arc-extinguishing grid plate (3) is provided with an arc-inducing groove (4). The locking unit (5) includes a locking block (50) disposed on both sides of the arc-extinguishing grid plate (3), a locking groove (51) disposed on the support plate (20) and engaging with the locking block (50), and an elastic locking tongue (52) disposed in the locking groove (51) with its free end for the locking block (50) to pass through. When the free end of the elastic locking tongue (52) is reset, it abuts against the locking block (50) engaging with the locking groove (51) to prevent it from disengaging from the locking groove (51).

2. The arc-extinguishing cover of a circuit breaker according to claim 1, characterized in that, The resilient latch (52) is made of engineering plastic.

3. The arc-extinguishing cover of a circuit breaker according to claim 2, characterized in that, The elastic locking tongue (52) and the support plate (20) are integrally injection molded.

4. The arc-extinguishing cover of a circuit breaker according to claim 1, characterized in that, The arc-quenching grid (3) includes: The upper grid plate (30) is located on the upper part of the support frame (2), and the upper grid plate (30) is arranged in an inclined upward direction; The lower grid plate (31) is located at the lower part of the support frame (2), and the lower grid plate (31) is arranged in an inclined downward direction.

5. The arc-extinguishing cover of a circuit breaker according to claim 4, characterized in that, The upper grid plate (30) and the lower grid plate (31) form a V-shaped angle.

6. The arc-extinguishing cover of a circuit breaker according to claim 5, characterized in that, The bottom surface of the upper grid plate (30) and the top surface of the lower grid plate (31) are provided with arc-extinguishing teeth (6), which are perpendicular to the support plate (20) and arranged at intervals.

7. The arc-extinguishing cover of a circuit breaker according to claim 6, characterized in that, The radial cross section of the arc-extinguishing tooth (6) is triangular.

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