Spliced partition structure and circuit breaker arc extinguishing chamber

Abstract

This utility model discloses a spliced ​​partition structure and a circuit breaker arc-extinguishing chamber, including a gas-generating partition and a heat-resistant partition disposed near the stationary contact of the circuit breaker. The gas-generating partition is configured to be assembled with the heat-resistant partition on the same plane, and the gas-generating partition is spliced ​​at a position away from the stationary contact of the circuit breaker. In this utility model, the gas-generating partition and the heat-resistant partition are spliced ​​on the same plane, and the gas-generating partition is spliced ​​at a position away from the stationary contact of the circuit breaker. This ensures that the gas-generating partition is not directly adjacent to the stationary contact of the circuit breaker, effectively avoiding the circuit breaker's conductive system and the area with the highest temperature during contact arc generation. This prevents long-term heat accumulation that could cause the gas-generating partition to melt and deform, thereby improving the service life of the spliced ​​partition and ensuring stable product performance.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically to a splicing partition structure and a circuit breaker arc-extinguishing chamber. Background Technology

[0002] The changes in the new energy industry, the increasing demands of the new energy storage industry, and the continuous increase in the installed capacity of batteries in the energy storage industry have led to increasingly higher requirements for the voltage and current carrying capacity of high-voltage boxes in energy storage. As a result, the specifications required for circuit breaker products in high-voltage boxes have become increasingly stringent. The initial voltage requirement of DC 1000V has been increased to 1500V, and now some manufacturers have proposed requirements of 2000V and 2500V. The breaking protection current has increased from the original DC 10kA to 15kA, and now even to 20kA or higher. Furthermore, initially, DC products in the new energy DC field were all improved from 4P circuit breakers. This is because only two interfaces, positive and negative, are generally required. Therefore, 4P circuit breakers either use internal shorting bars or external shorting bars. However, multi-stage series shorting results in many contact points, high resistance, small cross-sectional area of ​​the internal series busbar, poor heat dissipation, and high temperature. The exposed external series busbar is prone to insulation breakdown. Therefore, one improvement method is to directly improve the circuit breaker to a 2P structure to improve the defects caused by the above shorting. However, after changing from 4P to 2P, the product size will be significantly reduced, and the heat dissipation area will also be reduced. During operation, heat is prone to accumulate inside the circuit breaker, especially during UL certification. This is because the frequency required for electrical life in UL certification is four times higher than that in ICE certification, leading to more serious heat accumulation. The heat accumulation can also cause the gas-generating material in the arc-extinguishing chamber structure inside the circuit breaker to melt and deform due to prolonged high-temperature erosion, which may eventually cause the moving contact of the circuit breaker to jam or even fail to operate. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a splicing partition structure, which mainly solves the technical problem that the gas-generating materials in existing arc-extinguishing chambers are prone to deformation due to high-temperature ablation caused by heat accumulation during use.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution: A splicing partition structure is used in the arc-extinguishing chamber of a circuit breaker, including a gas-generating partition and a heat-resistant partition disposed near the stationary contact of the circuit breaker. The gas-generating partition is configured to be assembled and combined with the heat-resistant partition on the same plane, and the gas-generating partition is spliced ​​to the heat-resistant partition at a position away from the stationary contact of the circuit breaker.

[0005] Furthermore, the side of the splicing partition structure corresponding to the moving contact mechanism of the circuit breaker is defined as the front side, and the side of the splicing partition structure corresponding to the arc-extinguishing grid of the circuit breaker is defined as the rear side. The lower part of the heat-resistant partition has a heat-resistant base close to the stationary contact of the circuit breaker. The gas-generating partition is configured to be assembled and combined with the part of the heat-resistant partition above the heat-resistant base and away from the stationary contact of the circuit breaker in the same plane in the front-rear direction.

[0006] Furthermore, a splicing gap is formed on the front side of the heat-resistant partition above the heat-resistant base. The top surface of the heat-resistant base, the side of the splicing gap, and the top surface of the heat-resistant partition are sequentially formed to form a first splicing surface, a second splicing surface, and a third splicing surface that are interconnected. A fourth splicing surface, a fifth splicing surface, and a sixth splicing surface are formed on the gas-generating partition, respectively adapted to the first splicing surface, the second splicing surface, and the third splicing surface.

[0007] Furthermore, the first splicing surface is roughly horizontal, the second splicing surface is roughly vertical, and the third splicing surface extends upwards and tilts to the rear.

[0008] Furthermore, the gas-generating baffle and the heat-resistant baffle have several first arc-extinguishing grid slots and second arc-extinguishing grid slots arranged in sequence on the side of the grid foot facing the arc-extinguishing grid.

[0009] Furthermore, a limiting structure is provided between the gas-generating baffle and the heat-resistant baffle to enhance the stability of their assembly.

[0010] Furthermore, limiting slots are provided on the second and third splicing surfaces of the heat-resistant partition, while limiting protrusions that are adapted to the two limiting slots are provided on the fifth and sixth splicing surfaces of the gas-generating partition. The two limiting protrusions form a limiting fit with the two limiting slots to improve the assembly stability between the gas-generating partition and the heat-resistant partition, and to make the gas-generating partition only able to be laterally assembled relative to the heat-resistant partition in the left or right direction.

[0011] Furthermore, limiting walls are formed on the first, second, and third splicing surfaces of the heat-resistant partition, thereby stopping and limiting the lateral assembly of the gas-generating partition and the heat-resistant partition.

[0012] Based on the same inventive concept, this utility model also provides a circuit breaker arc-extinguishing chamber, including arc-extinguishing grid plates, two arc-isolating plates, and two sets of the above-mentioned spliced ​​partition plate structures. The two spliced ​​partition plate structures are respectively locked to the inner walls of the two arc-isolating plates by a number of fastening screws. A number of arc-extinguishing grid plate positioning holes are opened on the two arc-isolating plates. A number of positioning protrusions that cooperate with each arc-extinguishing grid plate positioning hole are provided on the left and right sides of the arc-extinguishing grid plates. The arc-extinguishing grid plates are connected to the two arc-isolating plates by the insertion and cooperation of each positioning protrusion with the corresponding arc-extinguishing grid plate positioning hole. Each grid plate foot of the arc-extinguishing grid plate is respectively inserted into the corresponding first arc-extinguishing grid plate slot and second arc-extinguishing grid plate slot.

[0013] Furthermore, the gas-generating baffle is a gas-generating baffle structure made of thermoplastic PA material, the heat-resistant baffle is a heat-resistant baffle structure made of thermosetting plastic material, and the arc-blocking plate is an arc-blocking plate structure made of melamine material.

[0014] The above technical solution has the following advantages or beneficial effects:

[0015] In the spliced ​​partition structure and circuit breaker arc-extinguishing chamber described in this utility model, the gas-generating partition and the heat-resistant partition are spliced ​​together on the same plane. Furthermore, the lower part of the heat-resistant partition has a heat-resistant base, and the gas-generating partition is spliced ​​and combined with the part above the heat-resistant base. In this way, the gas-generating partition as a whole does not directly approach the stationary contact of the circuit breaker. Instead, the heat-resistant base provides a certain degree of insulation against high temperatures for the gas-generating partition. This allows the gas-generating partition to effectively avoid the conductive system of the circuit breaker and the area with the highest temperature when the contact arc is generated. This prevents the gas-generating partition from melting and deforming due to long-term heat accumulation, thereby improving the service life of the spliced ​​partition and ensuring stable product performance. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the arc-extinguishing chamber of the circuit breaker according to an embodiment of the present invention.

[0017] Figure 2 This is an exploded three-dimensional structural diagram of the arc-extinguishing chamber of the circuit breaker according to an embodiment of the present invention.

[0018] Figure 3 This is a three-dimensional structural schematic diagram of the arc-extinguishing grid sheet according to an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the circuit breaker arc-extinguishing chamber in use according to an embodiment of this utility model.

[0020] Figure 5 This is a partial structural schematic diagram of the arc-extinguishing chamber of a 2P structure circuit breaker according to an embodiment of this utility model.

[0021] Label Explanation:

[0022] 1. Gas-generating baffle, 2. Heat-resistant baffle, 3. Arc-extinguishing grid plate, 4. Arc-blocking plate, 5. Fastening screw, 6. Circuit breaker stationary contact, 7. Circuit breaker moving contact mechanism, 11. Fourth splicing surface, 12. Fifth splicing surface, 13. Sixth splicing surface, 14. First arc-extinguishing grid plate slot, 15. Limiting bracket protrusion, 21. Heat-resistant base, 22. Splicing gap, 23. First splicing surface, 24. Second splicing surface, 25. Third splicing surface, 26. Second arc-extinguishing grid plate slot, 27. Limiting bracket groove, 28. Limiting barrier, 31. Positioning protrusion, 32. Grid plate foot, 41. Arc-extinguishing grid plate positioning hole. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Please refer to the appendix. Figure 1 To be continued Figure 5One embodiment of this utility model provides a splicing partition structure applied in the arc-extinguishing chamber of a circuit breaker, including a gas-generating partition 1 and a heat-resistant partition 2 near the stationary contact 6 of the circuit breaker. Preferably, the lower part of the heat-resistant partition 2 has a heat-resistant base 21 near the stationary contact 6 of the circuit breaker. The side of the splicing partition structure corresponding to the moving contact mechanism 7 of the circuit breaker is defined as the front side, and the side of the splicing partition structure corresponding to the arc-extinguishing grid 3 of the circuit breaker is defined as the rear side. The gas-generating partition 1 is configured to be assembled with the heat-resistant partition 2 in the same plane in the front-rear direction from the part above the heat-resistant base 21 and away from the stationary contact 6 of the circuit breaker. It is understood that in this embodiment, the gas-generating baffle 1 and the heat-resistant baffle 2 are spliced ​​together on the same plane. The lower part of the heat-resistant baffle 2 has a heat-resistant base 21, and the gas-generating baffle 1 is spliced ​​together with the part above the heat-resistant base 21. In this way, the gas-generating baffle 1 as a whole does not directly approach the stationary contact 6 of the circuit breaker (when the stationary contact of the circuit breaker is separated from the moving contact mechanism 7 of the circuit breaker, a high-temperature arc will be generated at the contact gap, and the closer to the contact, the higher the ambient temperature). Instead, the heat-resistant base 21 plays a certain role in isolating the gas-generating baffle 1 from the high temperature, so that the gas-generating baffle 1 effectively avoids the conductive system of the circuit breaker and the area with the highest temperature when the contact arc is generated. This avoids the long-term heat accumulation that causes the gas-generating baffle 1 to melt and deform, thereby improving the service life of the spliced ​​baffle and ensuring the stability of product performance. Furthermore, the planar, vertically connected panel structure of this embodiment can improve the breaking capacity of the circuit breaker. When the moving contact of the circuit breaker just opens, the arc initiation point is concentrated near the contact. At this time, the arc is at its highest because most of it is concentrated between the contacts and in areas where the cooling of the grid plate cutting is minimal. Therefore, a thermosetting material is used at the lower end to isolate the arc from the grid plate feet. As the moving contact opens to a larger angle, and the arc lengthens, some of the arc will pass through the arc-initiating angle on the contact and enter the grid plate of the arc-extinguishing chamber. Another portion will enter the grid plate for cooling and cutting due to the blowing effect. As the contact opens further, most of the arc will be further cooled due to the stronger arc initiation angle. The blowing effect allows more arc-extinguishing grids near the upper part to cut and cool, resulting in a lower temperature at the upper gas-generating baffle. Compared to existing internally and externally wrapped baffle structures (where thermosetting material is wrapped around the gas-generating baffle to improve its temperature resistance), the baffle structure in this embodiment, with its rationally positioned baffle, isolates the high-temperature area via the heat-resistant base 21 of the heat-resistant baffle 2. This allows the arc at a suitable temperature to directly contact the baffle, thus balancing the high-temperature melting and deformation of the baffle with its gas-generating performance to ensure sufficient gas production to drive the arc into the arc-extinguishing grids for cutting and cooling. Furthermore, repeated switching operations at high frequency and rated voltage and current during the electrical life will cause a large amount of heat accumulation. The spliced ​​baffle structure of this embodiment effectively improves the electrical life of the structure through the thermal isolation effect of the heat-resistant base.Furthermore, in this embodiment, the gas-generating baffle 1 and the heat-resistant baffle 2 are assembled by splicing them together on the same plane. Compared with the existing structure that wraps the gas-generating material with thermosetting heat-resistant material, this method has a better balance between heat resistance and gas generation performance. Moreover, existing technologies use thermosetting heat-resistant materials, including the gas-generating material, in the hope of mitigating the melting and deformation caused by high-temperature erosion. Therefore, to effectively release gas, corresponding venting holes must be opened in the thermosetting material. Even though the high-temperature electric arc can directly contact the internal gas-generating material through these venting holes, the gas-generating material may still deform due to high-temperature erosion. Furthermore, the gas generation effect of the encased gas-generating material is significantly reduced due to the influence of the external thermosetting material. In normal operating conditions, the existing inner and outer encapsulated baffle structure can still work normally to meet the purpose of interrupting abnormal current. However, when dealing with special operating conditions such as high voltage and high current conditions in the new energy field and heat accumulation problems caused by high frequency electrical life in UL certification, the existing baffle structure of the arc-extinguishing chamber will be difficult to cope with. In contrast, the baffle structure with the same plane splicing structure in this embodiment can effectively avoid the above-mentioned problems.

[0026] Please refer to the appendix. Figure 1 To be continued Figure 3 In one preferred embodiment, preferably, a splicing gap 22 is formed on the front side of the heat-resistant partition 2 above the heat-resistant base 21. A first splicing surface 23, a second splicing surface 24, and a third splicing surface 25 are sequentially formed on the top surface of the heat-resistant base 21, the side surface of the splicing gap 22, and the top surface of the heat-resistant partition 2. A fourth splicing surface 11, a fifth splicing surface 12, and a sixth splicing surface 13 are formed on the gas-generating partition 1, respectively adapted to the first splicing surface 23, the second splicing surface 24, and the third splicing surface 25. Further, the first splicing surface 23 is generally horizontal, the second splicing surface 24 is generally vertical, and the third splicing surface 25 extends upwards and tilts towards the rear. In this embodiment, the gas-generating baffle 1 is positioned so that it is offset from the region of highest arc temperature by a specific splicing position, and is also basically aligned with the moving contact of the circuit breaker. This allows the spliced ​​baffle structure to balance temperature resistance and gas generation performance, thereby improving the gas generation arc extinguishing effect and ensuring its high-temperature resistance to mitigate problems such as bulging, deformation, and carbonization caused by high temperatures. This improves the service life of the spliced ​​baffle and ensures the stability of the product test.

[0027] Please refer to the appendix. Figure 1 To be continued Figure 3 In one preferred embodiment, the gas-generating baffle 1 and the heat-resistant baffle 2 are respectively provided with a plurality of first arc-extinguishing grid slots 14 and second arc-extinguishing grid slots 26 arranged in sequence on the side of the grid foot 32 facing the arc-extinguishing grid 3.

[0028] Please refer to the appendix. Figure 1To be continued Figure 3 In one preferred embodiment, a limiting structure is provided between the gas-generating partition 1 and the heat-resistant partition 2 to enhance the assembly stability of the two. Preferably, limiting slots 27 are provided on the second splicing surface 24 and the third splicing surface 25 of the heat-resistant partition 2, while limiting protrusions 15 adapted to the two limiting slots 27 are provided on the fifth splicing surface 12 and the sixth splicing surface 13 of the gas-generating partition 1. The two limiting protrusions 15 form a limiting fit with the two limiting slots 27 to improve the assembly stability between the gas-generating partition 1 and the heat-resistant partition 2, and to ensure that the gas-generating partition 1 can only be laterally assembled relative to the heat-resistant partition 2 in the left or right direction. However, those skilled in the art should understand that in other embodiments, other existing conventional limiting structures and adaptive changes in the arrangement of the limiting structures can be set between the splicing positions of the gas-generating baffle 1 and the heat-resistant baffle 2 to limit the splicing between the gas-generating baffle 1 and the heat-resistant baffle 2 in order to improve splicing stability, and are not limited to the specific implementation methods disclosed in this embodiment.

[0029] Please refer to the appendix. Figure 1 To be continued Figure 3 In one preferred embodiment, limiting baffles 28 are formed on the first splicing surface 23, the second splicing surface 24, and the third splicing surface 25 of the heat-resistant partition 2. These limiting baffles 28 stop and limit the lateral assembly of the gas-generating partition 1 and the heat-resistant partition 2. However, those skilled in the art should understand that in other embodiments, limiting baffles 28 can also be set at any one or two of the first splicing surface 23, the second splicing surface 24, and the third splicing surface 25. The embodiment is not limited to the specific implementation disclosed herein, as long as it can stop and limit the lateral assembly of the gas-generating partition 1 and the heat-resistant partition 2. Those skilled in the art can set and arrange the baffles according to specific needs.

[0030] Please refer to the appendix. Figure 1 To be continued Figure 3An embodiment of this utility model also provides a circuit breaker arc-extinguishing chamber, including an arc-extinguishing grid plate 3, two arc-blocking plates 4, and two sets of the above-mentioned spliced ​​partition structure (the two sets of spliced ​​partition structure are mirror symmetrical structures). The two spliced ​​partition structure is respectively locked to the inner wall of the two arc-blocking plates 4 by a number of fastening screws 5. A number of arc-extinguishing grid plate positioning holes 41 are provided on the two arc-blocking plates 4. A number of positioning protrusions 31 are provided on the left and right sides of the arc-extinguishing grid plate 3, which respectively cooperate with each arc-extinguishing grid plate positioning hole 41. The arc-extinguishing grid plate 3 and the two arc-blocking plates 4 are connected together by the insertion and cooperation of each positioning protrusion 31 with each corresponding arc-extinguishing grid plate positioning hole 41. Each grid plate foot 32 of the arc-extinguishing grid plate 3 is respectively inserted into each corresponding first arc-extinguishing grid plate slot 14 and second arc-extinguishing grid plate slot 26. In this embodiment, since a limiting structure is provided between the splicing parts of the gas generating baffle 1 and the heat-resistant baffle 2, after the gas generating baffle 1 and the heat-resistant baffle 2 are spliced ​​laterally, the spliced ​​baffle structure can be securely locked onto the arc-blocking plate 4 by the fastening screws 5 installed laterally.

[0031] Please refer to the appendix. Figure 1 To be continued Figure 3 In one preferred embodiment, the gas-generating baffle 1 is a gas-generating baffle structure made of thermoplastic PA material, the heat-resistant baffle 2 is made of thermosetting plastic with high temperature resistance and deformation resistance, and the arc-blocking plate 4 is an arc-blocking plate structure made of melamine material, which has excellent gas-generating performance.

[0032] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model. Therefore, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A splicing partition structure, applied in the arc-extinguishing chamber of a circuit breaker, characterized in that: It includes a gas-generating baffle (1) and a heat-resistant baffle (2) installed near the stationary contact (6) of the circuit breaker. The gas-generating baffle (1) is configured to be assembled with the heat-resistant baffle (2) on the same plane, and the gas-generating baffle (1) is spliced ​​to the heat-resistant baffle (2) at a position away from the stationary contact (6) of the circuit breaker.

2. The splicing partition structure according to claim 1, characterized in that: The side of the splicing partition structure corresponding to the moving contact mechanism of the circuit breaker is defined as the front side, and the side of the splicing partition structure corresponding to the arc extinguishing grid (3) of the circuit breaker is defined as the rear side. The lower part of the heat-resistant partition (2) has a heat-resistant base (21) close to the stationary contact (6) of the circuit breaker. The gas-generating partition (1) is configured to be assembled with the heat-resistant partition (2) in the same plane in the front-back direction from the part above the heat-resistant base (21) and away from the stationary contact (6) of the circuit breaker.

3. The splicing partition structure according to claim 2, characterized in that: A splicing gap (22) is formed on the front side of the heat-resistant partition (2) above the heat-resistant base (21). The top surface of the heat-resistant base (21), the side surface of the splicing gap (22) and the top surface of the heat-resistant partition (2) are sequentially connected to form a first splicing surface (23), a second splicing surface (24) and a third splicing surface (25). A fourth splicing surface (11), a fifth splicing surface (12) and a sixth splicing surface (13) are formed on the gas-generating partition (1) respectively, which are adapted to the first splicing surface (23), the second splicing surface (24) and the third splicing surface (25).

4. The splicing partition structure according to claim 3, characterized in that: The first splicing surface (23) is roughly horizontal, the second splicing surface (24) is roughly vertical, and the third splicing surface (25) extends upwards and tilts to the rear.

5. The splicing partition structure according to claim 1, characterized in that: The gas-generating baffle (1) and the heat-resistant baffle (2) are respectively provided with a number of first arc-extinguishing grid slots (14) and second arc-extinguishing grid slots (26) arranged in sequence on the side of the grid foot (32) of the arc-extinguishing grid (3).

6. The splicing partition structure according to any one of claims 3 to 5, characterized in that: A limiting structure is provided between the gas-generating baffle (1) and the heat-resistant baffle (2) to enhance the stability of their assembly.

7. The splicing partition structure according to claim 6, characterized in that: Limiting slots (27) are provided on the second splicing surface (24) and the third splicing surface (25) of the heat-resistant partition (2), while limiting protrusions (15) that are adapted to the two limiting slots (27) are provided on the fifth splicing surface (12) and the sixth splicing surface (13) of the gas-generating partition (1). The two limiting protrusions (15) form a limiting fit with the two limiting slots (27) respectively to improve the assembly stability between the gas-generating partition (1) and the heat-resistant partition (2) and make the gas-generating partition (1) only able to be laterally assembled relative to the heat-resistant partition (2) in the left or right direction.

8. The splicing partition structure according to claim 7, characterized in that: Limiting walls (28) are formed on the first splicing surface (23), the second splicing surface (24) and the third splicing surface (25) of the heat-resistant partition (2). The limiting walls (28) stop and limit the lateral assembly between the gas-generating partition (1) and the heat-resistant partition (2).

9. A circuit breaker arc-extinguishing chamber, characterized in that: The system includes an arc-extinguishing grid plate (3), two arc-blocking plates (4), and two sets of splicing partition structures as described in any one of claims 1 to 8. The two sets of splicing partition structures are mirror-symmetrical structures. The two splicing partition structures are respectively locked to the inner walls of the two arc-blocking plates (4) by several fastening screws (5). Several arc-extinguishing grid plate positioning holes (41) are provided on the two arc-blocking plates (4). Several positioning protrusions (31) are provided on the left and right sides of the arc-extinguishing grid plate (3) respectively, which cooperate with each arc-extinguishing grid plate positioning hole (41). The arc-extinguishing grid plate (3) and the two arc-blocking plates (4) are connected together by the insertion and cooperation of each positioning protrusion (31) with each corresponding arc-extinguishing grid plate positioning hole (41). Each grid plate foot (32) of the arc-extinguishing grid plate (3) is respectively inserted into each corresponding first arc-extinguishing grid plate slot (14) and second arc-extinguishing grid plate slot (26).

10. The circuit breaker arc-extinguishing chamber according to claim 9, characterized in that: The gas-generating baffle (1) is a gas-generating baffle structure made of thermoplastic PA material, the heat-resistant baffle (2) is a heat-resistant baffle structure made of thermosetting plastic material, and the arc-blocking baffle (4) is an arc-blocking baffle structure made of melamine material.

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