A circuit breaker
By employing a multi-pole main circuit structure and insulating baffles to separate conductive terminals in the circuit breaker, combined with slider limiting and sealing components, the problems of flashover and short circuit caused by small metal debris are solved, thereby improving the electrical safety and stability of the circuit breaker.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZHEJIANG SUONENG ELECTRIC GRP CO LTD
- Filing Date
- 2026-03-23
- Publication Date
- 2026-05-29
Smart Images
Figure CN122117702A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of power system protection equipment, and in particular to a circuit breaker. Background Technology
[0002] A residual current circuit breaker (RCCB) is a type of circuit breaker that integrates overload, short-circuit protection, and residual current protection functions. One type of circuit breaker in the related art includes a housing, inside which a current transformer, two conductive terminals, and a closing / opening mechanism capable of connecting or disconnecting the two conductive terminals are disposed.
[0003] In temporary distribution boxes at construction sites, residual current circuit breakers often require multiple wiring and maintenance processes. Cutting conductors and grinding busbars can easily generate small metal shavings that fall from above to the vicinity of the exposed conductive terminals of the circuit breaker. When there is vibration inside the cabinet or cable rebound, the shavings can migrate and accumulate near the conductive terminals, forming a cross-polar bridging, which can induce flashover or even short circuit between two adjacent conductive terminals and bring about safety hazards. Summary of the Invention
[0004] In order to improve and reduce the risk of failure caused by small metal debris falling near conductive terminals, this application provides a circuit breaker.
[0005] This application provides a circuit breaker that adopts the following technical solution: A circuit breaker includes a base, a cover on one side of the base, a bottom plate, and two symmetrical fixing plates on the side of the bottom plate facing the cover. The bottom plate and the two fixing plates enclose a receiving groove. A first fixing block aligned with the fixing plates is provided at the upper end of the cover. A first isolation structure is provided on the base. The first isolation structure includes a plurality of first isolation strips disposed on the bottom plate facing the fixing plates, a first insulating baffle disposed on the upper end of the fixing plates, and a first isolation block disposed on the upper end of the cover and aligned with the first isolation strips. A first insulating baffle is provided at the upper end of the first isolation strips. A multi-pole main circuit structure is disposed in the receiving groove. The multi-pole main circuit structure is located between the first isolation strips and adjacent first isolation strips / fixing plates. The multi-pole main circuit structure includes a housing, and a first conductive terminal is disposed inside the housing. The first conductive terminal extends upward out of the housing and is located between the first isolation strips and adjacent first isolation strips / fixing plates.
[0006] By adopting the above technical solution, the multi-pole main circuit structure is separated and limited between adjacent first isolation strips or between the first isolation strip and the fixed plate, and the first conductive terminal extending upward out of the housing is placed in the corresponding separation space. This forms a multi-level insulation isolation in the exposed area of the first conductive terminal, which can increase the effective air gap and creepage path between two adjacent first conductive terminals. When metal debris falls into the first conductive terminal or the environment is humid and dusty, the probability of flashover or short circuit between two adjacent first conductive terminals is reduced, improving the electrical safety of the exposed conductive parts of the circuit breaker and reducing the risk of circuit breaker failure. In addition, the first insulating baffle can increase the air gap and creepage distance between the first conductive terminal and other electrical components, reducing the impact of discharge on other electrical components.
[0007] Optionally, the first insulating partition is provided with a first slider on the side facing the cover, the base has a first sliding hole for inserting the first insulating partition on the end face facing the first isolation strip, the first isolation strip has a second sliding hole for inserting the first insulating partition on the end face facing the base, the first isolation block has a first insertion hole for inserting the first insulating partition and a second insertion hole for inserting the first slider on the side away from the first isolation strip, and the first slider and the second insertion hole form a stop fit in both the direction close to the cover and the direction away from the cover.
[0008] By adopting the above technical solution, the first slider is inserted into the second socket, which achieves bidirectional limiting of the first insulating partition along the direction close to the cover and away from the cover. This prevents the first insulating partition from shifting, tilting, or falling out under vibration or long-term thermal expansion and contraction. It ensures the relative position stability of the first insulating partition, the first isolation strip, and the first isolation block, and continuously maintains the isolation boundary and effective gap between the exposed conductive terminals of the multi-pole main circuit, reducing the probability of flashover or short circuit.
[0009] Optionally, the end face of the base plate away from the first isolation strip is set as a support plane, a locking block is provided in the first sliding hole, a gap is left between the locking block and the lower inner wall of the first sliding hole, and a slot for the locking block to be inserted is provided on the first insulating partition. The end face of the locking block away from the cover and the end face of the first insulating partition along the insertion direction both extend to the support plane.
[0010] By adopting the above technical solution, the circuit breaker is installed in the distribution box, and the end face of its base plate away from the fixed plate is in contact with the bottom wall of the distribution box. The end face of the locking block away from the cover and the end face of the first insulating partition along the insertion direction are also in contact with the bottom wall of the distribution box. This makes the side of the first insulating partition near the locking block form a continuous isolation boundary at the support plane, thereby reducing the possibility of the electric arc or discharge path detouring to the other side of the first insulating partition along the support plane direction, and maintaining the stability of the isolation structure under the vibration conditions of circuit breaker installation and operation.
[0011] Optionally, a first mounting assembly connecting the first insulating baffle and the fixing plate is provided. The first mounting assembly includes a mounting base and a second limiting block disposed on the side of the first insulating baffle facing the first insulating partition. The mounting base has a mounting groove for the fixing plate to be inserted on the side away from the first insulating baffle. The mounting groove passes through the mounting base towards the first insulating baffle. A first limiting block is disposed on the inner wall of the mounting groove near the first isolation strip. The fixing plate has a first limiting groove for the first limiting block to be inserted on the side facing the first isolation strip. The fixing plate has a second limiting groove for the second limiting block to be inserted on the side away from the first isolation strip. The first fixing block is located on the path of movement of the first limiting block away from the base plate.
[0012] By adopting the above technical solution, the first limiting block is inserted into the first limiting groove and the second limiting block is inserted into the second limiting groove. The first insulating baffle obtains reliable insertion positioning and limiting constraint on the fixed plate. The first fixed block is located on the path of the first limiting block moving away from the base plate, forming a travel block on the first limiting block, thereby suppressing the displacement of the mounting base relative to the fixed plate away from the base plate.
[0013] Optionally, the first fixing block is provided with a limiting part that inserts into the first limiting groove on the side facing the fixing plate, and the limiting part is located on the path of the first limiting block moving away from the bottom plate.
[0014] By adopting the above technical solution, the limiting part is inserted into the first limiting groove and positioned on the path of the first limiting block moving away from the base plate, so that the limiting part effectively blocks the first limiting block from moving away from the base plate; in addition, the pre-positioning of the cover and the base is achieved, which makes it convenient for workers to connect the cover and the base with fasteners.
[0015] Optionally, the first isolation structure further includes a first sealing component, which includes a mounting block disposed on the upper end of the cover and an operating plate disposed at one end of the first insulating partition along the pull-out direction. The mounting block is located between the first isolation block and an adjacent first isolation block / first fixing block. The mounting block has an installation notch on the side away from the cover. The operating plate is provided with an operating element for sliding into and closing the installation notch. The operating plate has an operating groove on the side facing the cover. The operating element includes a sealing plate slidably disposed in the operating groove. The sealing plate has a sealing block adapted to the installation notch on the side away from the bottom wall of the operating groove. The operating plate has an operating hole communicating with the operating groove on the side away from the first insulating partition. The operating hole is elongated. The operating element is provided with an operating rod inserted into the operating hole. The operating rod is slidably disposed in the operating hole. The operating plate is provided with a locking element for restricting the movement of the operating element.
[0016] By adopting the above technical solution, after the operating plate is assembled on the first insulating partition, the operating rod is driven to slide in the operating hole, which can realize the extension or retraction of the sealing block. When the sealing block is inserted into the installation notch, it can form an effective seal, reducing the probability of foreign objects such as metal debris and dust entering the first isolation structure through the installation notch, and reducing the risk of flashover or short circuit caused by foreign objects bridging the exposed first conductive terminal. The locking component is used to limit and lock the movement position of the operating component, preventing the sealing plate from retracting or being misplaced under vibration, impact, frequent operation or assembly stress.
[0017] Optionally, both the first isolation strip and the fixing plate have reinforcing strips on their end faces facing the mounting block. The reinforcing strips are located on the side of the mounting block facing the base, with one side connected to the mounting block and the other side extending to the end face of the first isolation strip / fixing plate facing the base. The reinforcing strips are arc-shaped in the direction facing the mounting notch. The side of the closing block facing the reinforcing strip has an elastic locking plate, and the side of the locking plate away from the closing block has a slot for inserting the reinforcing strip.
[0018] By adopting the above technical solution, the reinforcing strip is set as an arc-shaped surface facing the installation notch, so that the closing block can smoothly contact the mounting notch under the guidance of the arc-shaped surface during the sliding process of the closing block, and guide the locking plate on the closing block to elastically yield, reducing assembly resistance and the risk of scratch interference. When the closing block slides into place, the locking plate makes the locking groove and the reinforcing strip lock and position under the action of elastic restoring force, thereby forming a reliable limit retention for the closing block. One end of the reinforcing strip is connected to the mounting block, and the other end extends to the end face of the first isolation strip / fixed plate facing the base, which can improve the local bending stiffness and torsional stiffness of the first isolation strip and fixed plate in the area near the mounting block.
[0019] Optionally, the operating slot has a groove on the inner wall facing the first insulating partition. The locking component includes a locking block and a locking spring disposed in the groove. The locking spring is in a compressed state. One end of the locking spring is fixedly connected to the bottom wall of the groove, and the other end of the locking spring is fixedly connected to the locking block. The locking block has a chamfer. The chamfer bevel is disposed at the junction of the side of the locking block away from the bottom wall of the operating slot and the side of the locking block away from the locking spring. The sealing plate has a locking groove for the locking block to be inserted. When the locking block is inserted into the locking groove, the operating component is in a retracted state.
[0020] By adopting the above technical solution, the locking block is inserted into the locking groove to lock the operating component, preventing the operating component from retracting or shifting due to vibration, impact or external disturbance, which could lead to the accidental opening of the installation gap. When the operating component moves towards the bottom wall of the operating groove, the closing plate contacts the chamfer. As the closing plate continues to move, it guides the locking block to overcome the spring force of the locking spring and retract, allowing the operating component to smoothly pass through the locking position and complete the opening and closing switch, ensuring both locking reliability and smooth operation.
[0021] Optionally, the bottom wall of the locking groove has a through hole, the operating rod is disposed in the through hole, the opening shape of the locking groove is not smaller than the opening shape of the groove, and an operating block with the same opening shape as the locking groove is disposed in the locking groove, one end of the operating block is connected to the operating rod.
[0022] By adopting the above technical solution, a driving force is applied to the operating lever along its axial direction. This driving force is then transmitted to the locking block through the operating block, causing the locking block to disengage from the locking groove. This achieves rapid unlocking of the operating component and improves operational reliability. The opening of the locking groove is not smaller than the opening of the groove, preventing the operating block from entering the groove and avoiding interference between the locking block and the edge of the groove opening during the unlocking process.
[0023] Optionally, the housing is provided with a second conductive terminal and a closing / opening assembly for realizing the connection and disconnection between the first conductive terminal and the second conductive terminal. The second conductive terminal extends downward to the outside of the housing. A first arc-extinguishing channel is provided at the upper end of the housing. The opening of the first arc-extinguishing channel is located between the mounting block and the first conductive terminal. An arc-extinguishing grid assembly and a throttling plate are provided in the first arc-extinguishing channel. The throttling plate is located on the side of the arc-extinguishing grid assembly away from the closing / opening assembly.
[0024] By adopting the above technical solution, the closing and opening assembly connects the first conductive terminal and the second conductive terminal in the closed state, and disconnects the circuit between the first conductive terminal and the second conductive terminal in the open state. The arc generated by the opening of the closing and opening assembly is distributed, cooled and deionized after entering the arc extinguishing grid assembly. The arc products are further decelerated, cooled and blocked by the throttling plate, thereby reducing the risk of thermal shock and contamination of the closing and opening assembly and the internal structure of the housing by high-temperature arc gas and molten particles, suppressing the possibility of flame escape and secondary flashover, and improving the breaking reliability and operational safety of the circuit breaker. In addition, after the first sealing assembly closes the installation gap, the first sealing assembly can form an isolation and guiding constraint on the airflow channel between the circuit breaker terminal area and the internal arc extinguishing area, so that the high-temperature arc gas, metal vapor and molten particles generated during the closing and opening process are not easy to backflow or escape into the space where the first isolation structure is located through the installation gap, thereby reducing the probability of arc products depositing and forming a conductive contamination film in the exposed area of the terminal.
[0025] In summary, this application includes at least one of the following beneficial technical effects: The multi-pole main circuit structure is divided and confined between adjacent first isolation strips or between the first isolation strip and the fixed plate, and the first conductive terminal extending upward out of the housing is placed in the corresponding separation space. This forms a multi-level insulation isolation in the exposed area of the first conductive terminal, which can increase the effective air gap and creepage path between two adjacent first conductive terminals. When metal debris falls into the first conductive terminal or the environment is humid and dusty, it reduces the probability of flashover or short circuit between two adjacent first conductive terminals, improves the electrical safety of the exposed conductive parts of the circuit breaker, and reduces the risk of circuit breaker failure. In addition, the first insulating baffle can increase the air gap and creepage distance between the first conductive terminal and other electrical components, reducing the impact of discharge on other electrical components. The first slider is inserted into the second socket and forms a stop engagement with the socket in the direction near the cover and away from the cover, which prevents the first insulating partition from shifting or falling out under vibration, thermal expansion and contraction or external disturbance, thereby stabilizing the isolation boundary and further reducing the risk of flashover or short circuit. Attached Figure Description
[0026] Figure 1 This is a structural schematic diagram of an embodiment of this application; Figure 2 This is a structural diagram highlighting the connection between the base and the first insulating baffle; Figure 3 This is a schematic diagram highlighting the structure of the cover; Figure 4 This is a structural diagram highlighting the base; Figure 5 This is a structural diagram highlighting the first enclosed component; Figure 6 This is a structural schematic diagram highlighting the operating components; Figure 7 This is a partial sectional view highlighting the structure of the circuit breaker; Figure 8 yes Figure 7 An enlarged schematic diagram of part A in the middle; Figure 9 This is a structural diagram illustrating the inertia of the base and the multi-pole main circuit structure.
[0027] Reference numerals: 1. Base; 11. Base plate; 111. First sliding hole; 12. Fixing plate; 121. First limiting groove; 122. Second limiting groove; 13. Receiving groove; 14. Current transformer; 2. Cover; 21. First fixing block; 211. Third limiting groove; 212. Limiting part; 22. Second fixing block; 3. First isolation structure; 31. First insulating baffle; 311. First positioning block; 32. First isolation strip; 321. Second sliding hole; 322. First slot; 323. Reinforcing strip; 33. First Insulating partition; 331, First slider; 332, Second positioning block; 34, First isolation block; 341, First insertion hole; 342, Second insertion hole; 35, First sealing assembly; 351, Mounting block; 3511, Mounting notch; 3512, Mounting strip; 352, Operating panel; 3521, First slide rail; 3522, Second slide rail; 3523, First positioning groove; 3524, Second positioning groove; 3525, Operating groove; 3526, Operating hole; 3527, Groove; 36, First mounting assembly; 361, Installation... Mounting base; 3611, Mounting slot; 362, First limit block; 363, Second limit block; 37, Operating component; 371, Enclosing plate; 3711, Locking slot; 3712, Through hole; 3713, Locking plate; 3714, Positioning slot; 3715, Storage slot; 3716, Stop bar; 3717, Support base; 3718, Stop block; 3719, Rotating shaft; 372, Enclosing block; 3721, Mounting ring groove; 373, Operating lever; 3731, Operating block; 38, Locking component; 381, Locking block; 382, Lock 4. Fixed spring; 41. Second isolation structure; 42. Second insulating baffle; 43. Second isolation strip; 44. Second slot; 45. Second insulating partition; 46. Second slider; 47. Second isolation block; 48. Third socket; 49. Fourth socket; 40. Second sealing assembly; 41. Second mounting assembly; 52. Multi-pole main circuit structure; 53. First conductive terminal; 54. Second conductive terminal; 55. Closing and opening assembly; 56. Housing; 57. First arc extinguishing channel; 58. Arc extinguishing grid assembly; 59. Throttling plate. Detailed Implementation
[0028] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail.
[0029] This embodiment discloses a circuit breaker. (Refer to...) Figure 1 A circuit breaker, comprising a base 1 and a cover 2.
[0030] Reference Figure 1 and Figure 2The base 1 has a receiving groove 13 on the side facing the cover 2. The base 1 includes a base plate 11 and two fixing plates 12. Both fixing plates 12 are fixedly connected to the side of the base plate 11 facing the cover 2 and are symmetrical to each other. The receiving groove 13 is formed by the base plate 11 and the two fixing plates 12. The end face of the base plate 11 away from the fixing plates 12 is set as a supporting plane.
[0031] Reference Figure 2 and Figure 3 The cover 2 is located on the side of the fixing plate 12 away from the base plate 11. Two first fixing blocks 21 are fixedly connected to the upper end face of the cover 2, and each of the two first fixing blocks 21 is aligned with one of the fixing plates 12. Two second fixing blocks 22 are fixedly connected to the lower end face of the cover 2, and each of the two second fixing blocks 22 is aligned with one of the fixing plates 12.
[0032] Reference Figure 1 The base 1 is provided with a first isolation structure 3 and a second isolation structure 4. The first isolation structure 3 and the second isolation structure 4 are arranged opposite to each other, with the first isolation structure 3 located above the second isolation structure 4.
[0033] Reference Figure 1 , Figure 2 and Figure 3 The first isolation structure 3 includes two first insulating baffles 31, three first isolation strips 32, three first insulating partitions 33, three first isolation blocks 34, and a first sealing assembly 35.
[0034] Reference Figure 2 The three first isolation strips 32 are all fixedly connected to the end face of the base plate 11 facing the fixed plate 12, and are all located between the two fixed plates 12. The three first isolation strips 32 are distributed at intervals in the horizontal direction. The upper end face of the first isolation strip 32 is coplanar with the upper end face of the base plate 11.
[0035] Reference Figure 1 and Figure 4 The bottom plate 11 has three first sliding holes 111 on its end face facing the first partition strip 32, and the first sliding holes 111 extend upward through the bottom plate 11. The three first sliding holes 111 are distributed at intervals in the horizontal direction, and each of the three first sliding holes 111 is aligned with one of the first partition strips 32. A locking block is fixedly connected inside the first sliding hole 111, and a gap is left between the locking block and the lower inner wall of the first sliding hole 111. The end face of the locking block away from the cover 2 extends to the support plane.
[0036] Reference Figure 4 The first isolation strip 32 has a second sliding hole 321 on its end face facing the base plate 11, and the second sliding hole 321 extends upward through the first isolation strip 32. The second sliding hole 321 is aligned with and connected to the first sliding hole 111.
[0037] Reference Figure 2 , Figure 3 and Figure 4 Three first insulating partitions 33 are each disposed on the upper end of a first isolation strip 32. A first slider 331 is fixedly connected to the side of the first insulating partition 33 facing the cover 2. Both the first sliding hole 111 and the second sliding hole 321 allow the first insulating partition 33 to be inserted. A slot is provided on the first insulating partition 33 for inserting a locking block.
[0038] In other embodiments, the number of first isolation strips 32 and first insulating partitions 33 is the same, and each can be one, two or other quantities.
[0039] Reference Figure 2 and Figure 3 All three first isolation blocks 34 are fixedly connected to the upper end face of the cover 2 and are located between the two first fixing blocks 21. The three first isolation blocks 34 are horizontally spaced apart and each is aligned with a first isolation strip 32.
[0040] Reference Figure 2 and Figure 3 The first isolation block 34 has a first insertion hole 341 and a second insertion hole 342 on its end face away from the first isolation strip 32. The first insertion hole 341 extends upward through the first isolation block 34, allowing the first insulating partition 33 to be inserted. The second insertion hole 342 is located directly below the first insertion hole 341 and communicates with it. The second insertion hole 342 allows the first slider 331 to be inserted, and the first slider 331 and the second insertion hole 342 form a stop fit both near the cover 2 and away from the cover 2. Furthermore, the first isolation strip 32 has a first slot 322 on its end face facing the first isolation block 34, which is aligned with the second insertion hole 342. The first slot 322 allows the first slider 331 to be inserted.
[0041] In other embodiments, a plurality of elastic pre-tightening ribs are fixedly connected to the circumferential surface of the first slider 331. Both the first slider 331 and the elastic pre-tightening ribs can be inserted into the second insertion hole 342. The elastic pre-tightening ribs deform and abut against the inner wall of the second insertion hole 342, so that the position of the first insulating partition 33 can still be kept stable under assembly tolerance and external force disturbance.
[0042] Reference Figure 2 Each first insulating baffle 31 is disposed on the upper end of a fixed plate 12. A first mounting assembly 36 is provided between the first insulating baffle 31 and the fixed plate 12 to connect the two. The first mounting assembly 36 includes a mounting base 361, a first limiting block 362, and a second limiting block 363.
[0043] Reference Figure 2 and Figure 4The mounting base 361 is fixedly connected to the end face of the first insulating baffle 31 facing the first insulating partition 33. A mounting groove 3611 is formed on the side of the mounting base 361 away from the first insulating baffle 31. Both the side of the mounting groove 3611 near the base plate 11 and the side of the mounting groove 3611 away from the base plate 11 penetrate the mounting base 361, and the mounting base 361 extends towards the first insulating baffle 31. The fixing plate 12 can be inserted into the mounting groove 3611. The first limiting block 362 is fixedly connected to the inner wall of the mounting groove 3611 near the first isolation strip 32.
[0044] Reference Figure 2 and Figure 4 The second limiting block 363 is fixedly connected to the end face of the first insulating baffle 31 facing the first insulating partition 33, and the second limiting block 363 is located on the side of the mounting base 361 away from the base plate 11.
[0045] Reference Figure 2 , Figure 3 and Figure 4 A first limiting groove 121 is provided on the end face of the fixing plate 12 facing the first isolation strip 32, and the first limiting groove 121 penetrates the fixing plate 12 on the end face away from the bottom plate 11. A first limiting block 362 is inserted into the first limiting groove 121. One end of the first limiting block 362 is in contact with the bottom plate 11.
[0046] Reference Figure 2 , Figure 3 and Figure 4 A limiting part 212, which is inserted into the first limiting groove 121, is fixedly connected to the side of the first fixing block 21 facing the fixing plate 12. The end face of the first limiting block 362 away from the bottom plate 11 contacts the limiting part 212. The limiting part 212 is located on the path of the first limiting block 362 moving away from the bottom plate 11. The limiting part 212, the bottom plate 11 and the fixing plate 12 form a surface contact stop fit with the first limiting block 362, which forms a hard limit on the upward displacement of the mounting base 361 and the first insulating baffle 31, suppressing the positional displacement or warping of the first insulating baffle 31, and maintaining the relative position and isolation boundary stability between the first insulating baffle 31 and the first isolation strip 32 and the first insulating partition 33.
[0047] Reference Figure 2 , Figure 3 and Figure 4 A second limiting groove 122 is provided on the end face of the fixing plate 12 away from the first isolation strip 32, and the second limiting groove 122 penetrates the fixing plate 12 towards the end face away from the bottom plate 11. A second limiting block 363 is inserted into the second limiting groove 122. A third limiting groove 211 is provided on the first fixing block 21, and the third limiting groove 211 is aligned with the second limiting groove 122.
[0048] Reference Figure 1 and Figure 3 The first enclosure component 35 includes a mounting block 351, an operation panel 352, and an operation element 37.
[0049] Reference Figure 1 and Figure 3 Four mounting blocks 351 are provided, each fixedly connected to the upper end of the cover 2, and the four mounting blocks 351 are horizontally spaced apart. The mounting blocks 351 are located between the first isolation block 34 and adjacent first isolation blocks 34 / first fixing blocks 21. When a mounting block 351 is located between two adjacent first isolation blocks 34, both horizontally opposite end faces of the mounting block 351 are fixedly connected to one of the first isolation blocks 34. When a mounting block 351 is located between the first isolation block 34 and the first fixing block 21, one end face of the mounting block 351 is fixedly connected to the first isolation block 34, and the other end face is fixedly connected to the first fixing block 21. A mounting notch 3511 is provided on the end face of the mounting block 351 away from the cover 2. The end of the mounting notch 3511 near the bottom plate 11 and the other end of the mounting notch 3511 away from the bottom plate 11 both penetrate the mounting block 351. A mounting strip 3512 is fixedly connected to the inner wall of the mounting notch 3511, and the mounting strip 3512 is arranged circumferentially around the mounting notch 3511.
[0050] Reference Figure 2 and Figure 3 A reinforcing strip 323 is fixedly connected to both the end face of the first isolation strip 32 facing the mounting block 351 and the end face of the fixing plate 12 facing the mounting block 351. The reinforcing strip 323 is located on the side of the mounting block 351 facing the base 1. The direction of the reinforcing strip 323 towards the mounting notch 3511 is arc-shaped. When the reinforcing strip 323 is on the fixing plate 12, one end of the reinforcing strip 323 is connected to the mounting block 351, and the other end of the reinforcing strip 323 extends to the end face of the fixing plate 12 facing the base 1. When the reinforcing strip 323 is on the first isolation strip 32, one end of the reinforcing strip 323 is connected to the mounting block 351, and the other end of the reinforcing strip 323 extends to the end face of the first isolation strip 32 facing the base 1.
[0051] Reference Figure 1 , Figure 2 and Figure 5 The operating plate 352 is disposed on one side of the first insulating partition 33 along the pull-out direction, which is the direction in which the first insulating partition 33 retracts relative to the first sliding hole 111. The operating plate 352 has a first slide rail 3521 and a second slide rail 3522 on the side facing the first insulating partition 33.
[0052] Reference Figure 5Two first slide rails 3521 are provided and are parallel to each other. The first slide rails 3521 extend vertically through the operating plate 352. The first slide rails 3521 allow the first insulating baffle 31 to be inserted. A first positioning block 311 is fixedly connected to the end face of the first insulating baffle 31 facing the operating plate 352. A first positioning groove 3523 is formed on the end face of the first positioning block 311 away from the fixed plate 12. The first positioning groove 3523 communicates with the first slide rails 3521 and allows the first positioning block 311 to be inserted.
[0053] Reference Figure 5 There are three parallel second slide rails 3522. Each of the three second slide rails 3522 is located between two first slide rails 3521. The second slide rails 3522 extend vertically through the operating plate 352. The second slide rails 3522 allow the insertion of a first insulating partition 33. A second positioning block 332 is fixedly connected to the end face of the first insulating partition 33 facing the operating plate 352. A second positioning groove 3524 is formed on the end face of the second positioning block 332 away from the fixed plate 12. The second positioning groove 3524 communicates with the second slide rails 3522 and allows the second positioning block 332 to be inserted.
[0054] Reference Figure 2 and Figure 6 The operating panel 352 has four operating slots 3525 on the side facing the cover 2, and the four operating slots 3525 are spaced apart. The operating slots 3525 are located between the first slide rail 3521 and an adjacent second slide rail 3522, or between two adjacent second slide rails 3522. When the operating slot 3525 is located between the first slide rail 3521 and an adjacent second slide rail 3522, one end of the operating slot 3525 is connected to the first slide rail 3521, and the other end is connected to the second slide rail 3522. When the operating slot is located between two adjacent second slide rails 3522, each of the opposite ends of the operating slot 3525 is connected to one of the second slide rails 3522.
[0055] Reference Figure 6 The operating plate 352 has four operating holes 3526 on the side away from the first insulating partition 33, and each operating hole 3526 is aligned with an operating slot 3525. The operating holes 3526 communicate with the operating slots 3525. The operating holes 3526 are elongated holes.
[0056] Reference Figure 3 and Figure 6 Each operating slot 3525 is provided with an operating component 37. The operating component 37 is used to close the mounting notch 3511. The operating component 37 includes a closing plate 371, a closing block 372, and an operating lever 373.
[0057] Reference Figure 1 and Figure 6The sealing plate 371 is inserted into the operating groove 3525 and can move along the axis of the operating groove 3525. One end of the sealing plate 371 is attached to the first insulating partition 33, and the other end of the sealing plate 371 is attached to the first insulating partition 33 or the first insulating baffle 31.
[0058] Reference Figure 1 and Figure 6 The sealing block 372 is fixedly connected to the sealing plate 371 in the direction away from the bottom wall of the operating groove 3525. The shape of the sealing block 372 is adapted to the mounting notch 3511. The sealing block 372 has a mounting ring groove 3721 in its circumferential direction, and the mounting strip 3512 can be inserted into the mounting ring groove 3721.
[0059] Reference Figure 3 and Figure 6 A locking plate 3713 is fixedly connected to the side of the closing block 372 facing the reinforcing strip 323. The locking plate 3713 is elastic. A locking groove 3714 is provided on the side of the locking plate 3713 away from the closing block 372, and the locking groove 3714 allows the reinforcing strip 323 to be inserted. When the reinforcing strip 323 is inserted into the locking groove 3714, it restricts the movement of the operating member 37 along the axial direction of the operating groove 3525.
[0060] Reference Figure 7 and Figure 8 A locking groove 3711 is provided on the end face of the closed plate 371 away from the operating hole 3526. A through hole 3712 is provided on the bottom wall of the locking groove 3711, and the through hole 3712 communicates with the operating hole 3526. An operating rod 373 is disposed in the through hole 3712. One end of the operating rod 373 passes through the operating hole 3526 and extends out of the operating plate 352. An operating block 3731 is fixedly connected to the other end of the operating rod 373, and the operating block 3731 is located in the locking groove 3711.
[0061] Reference Figure 7 and Figure 8 The locking element 38 is used to restrict the movement of the operating element 37. The locking element 38 includes a locking block 381 and a locking spring 382. The operating groove 3525 has a groove 3527 facing the inner wall of the first insulating partition 33. The opening shape of the locking groove 3711 is not smaller than the opening shape of the groove 3527.
[0062] Reference Figure 7 and Figure 8 The locking block 381 and the locking spring 382 are disposed within the groove 3527. One end of the locking spring 382 is fixedly connected to the bottom wall of the groove 3527, and the other end of the locking spring 382 is fixedly connected to the locking block 381. The locking spring 382 is in a compressed state.
[0063] Reference Figure 7 and Figure 8The locking block 381 has a chamfer, and the chamfered surface is located at the junction of the side of the locking block 381 away from the bottom wall of the operating groove 3525 and the side of the locking block 381 away from the locking spring 382. The locking block 381 can be inserted into the locking groove 3711. When the locking block 381 is inserted into the locking groove 3711, the operating member 37 is completely within the operating groove 3525, that is, the operating member 37 is in the retracted state.
[0064] Reference Figure 7 and Figure 8 A storage groove 3715 is formed on the end face of the sealing plate 371 facing the sealing block 372, and the storage groove 3715 penetrates the sealing plate 371 towards the bottom plate 11. A baffle 3716 is fixedly connected to the inner wall of the storage groove 3715 away from the sealing block 372. A support base 3717 is connected to the end face of the storage groove 3715 away from the bottom plate 11, and a rotating shaft 3719 is rotatably connected to the support base 3717. A baffle 3718 is sleeved on the rotating shaft 3719. The baffle 3718 can rotate around the axis of the rotating shaft 3719. One end of the baffle 3718 contacts the first insulating partition 33, and the other end of the baffle 3718 contacts the first insulating partition 33 / first insulating baffle 31.
[0065] Reference Figure 7 and Figure 8 A torsion spring is fitted onto the rotating shaft 3719. One end of the torsion spring is fixedly connected to the closing block 372, and the other end is fixedly connected to the stop block 3718. When the torsion spring is in a compressed state, it applies a force to the stop block 3718, causing it to rotate towards the base plate 11. When the operating component 37 is in the retracted state, the stop block 3718 is stored in the storage slot 3715 and simultaneously located in the operating slot 3525. When the operating component 37 is in use, the stop block 3718 abuts against the stop bar 3716 under the force of the torsion spring.
[0066] Reference Figure 1 , Figure 2 and Figure 3 The second isolation structure 4 includes two second insulating baffles 41, three second isolation strips 42, three second insulating partitions 43, three second isolation blocks 44, and a second enclosure component 45.
[0067] Reference Figure 2 The three second isolation strips 42 are all fixedly connected to the end face of the base plate 11 facing the fixed plate 12, and are all located between the two fixed plates 12. The three second isolation strips 42 are distributed at intervals in the horizontal direction, and each of the three second isolation strips 42 is aligned with a first isolation strip 32. The upper end face of the second isolation strip 42 is coplanar with the lower end face of the base plate 11.
[0068] Reference Figure 4The bottom plate 11 has three third sliding holes on its end face facing the second isolation strip 42, and the third sliding holes penetrate downward through the bottom plate 11. The three third sliding holes are distributed at intervals in the horizontal direction, and each of the three third sliding holes is aligned with one of the second isolation strips 42.
[0069] Reference Figure 4 The second isolation strip 42 has a fourth sliding hole on its end face facing the base plate 11, and the fourth sliding hole passes downward through the second isolation strip 42. The fourth sliding hole is aligned with and connected to the third sliding hole.
[0070] Reference Figure 2 , Figure 3 and Figure 4 Each of the three second insulating partitions is disposed at the lower end of a second insulating strip 42. A second slider 431 is fixedly connected to the side of the second insulating partition 43 facing the cover 2. The third and fourth sliding holes can both allow the second insulating partitions 43 to be inserted.
[0071] In other embodiments, the number of second isolation strips 42 and second insulating partitions 43 is the same, and each can be one, two or other quantities.
[0072] Reference Figure 2 and Figure 3 All three second isolation blocks 44 are fixedly connected to the lower end face of the cover 2 and are located between the two second fixing blocks 22. The three second isolation blocks 44 are horizontally spaced apart and each is aligned with a second isolation strip 42.
[0073] Reference Figure 2 and Figure 3 The second isolation block 44 has a third insertion hole 441 and a fourth insertion hole 442 on its end face away from the second isolation strip 42. The third insertion hole 441 extends downward through the second isolation block 44, allowing the second insulating partition 43 to be inserted. The fourth insertion hole 442 is located directly above the third insertion hole 441 and communicates with it. The fourth insertion hole 442 allows the second slider 431 to be inserted. The second slider 431 and the fourth insertion hole 442 form a stop fit both near the cover 2 and away from the cover 2. Furthermore, the second isolation strip 42 has a second slot 421 on its end face facing the second isolation block 44, which is aligned with the fourth insertion hole 442. The second slot 421 allows the second slider 431 to be inserted.
[0074] Reference Figure 1 and Figure 2Each second insulating baffle 41 is disposed at the lower end of a fixed plate 12. A second mounting assembly 46 is provided between the second insulating baffle 41 and the fixed plate 12 to connect the two. The structure of the second mounting assembly 46 is the same as that of the first mounting assembly 36, except that the first mounting assembly 36 is used to connect the first mounting base 361 to the fixed plate 12, and the second mounting assembly 46 is used to connect the second mounting base 361 to the fixed plate 12.
[0075] Reference Figure 1 and Figure 2 The second sealing component 45 is located below the cover 2. The structure of the second sealing component 45 is the same as that of the first sealing component 35, except that the first sealing component 35 is disposed on the first insulating partition 33, and the second sealing component 45 is disposed on the second insulating partition 43.
[0076] Reference Figure 9 A current transformer 14 is provided in the receiving groove 13, and the current transformer 14 is located between the first isolation bar 32 and the second isolation bar 42.
[0077] Reference Figure 7 and Figure 9 The receiving groove 13 is provided with at least two multi-pole main circuit structures 5. In this embodiment, there are three multi-pole main circuit structures 5. A portion of the multi-pole main circuit structures 5 are located between the first isolation strip 32 and the adjacent first isolation strip 32, and the remaining portion of the multi-pole main circuit structures 5 are located between the first isolation strip 32 and the adjacent fixing plate 12.
[0078] Reference Figure 7 and Figure 9 The multi-pole main circuit structure 5 includes a first conductive terminal 51, a second conductive terminal 52, a closing and opening assembly 53, and a housing 54.
[0079] Reference Figure 7 and Figure 9 The housing 54 is located between the first isolation strip 32 and the adjacent first isolation strip 32, or between the first isolation strip 32 and the adjacent fixing plate 12.
[0080] Reference Figure 7 and Figure 9 The first conductive terminal 51, the second conductive terminal 52, and the closing / opening assembly 53 are all located inside the housing 54. The first conductive terminal 51 is located above the second conductive terminal 52. The first conductive terminal 51 extends upwards outside the housing 54, and the portion of the first conductive terminal 51 extending outside the housing 54 is located between the first isolation strip 32 and the adjacent first isolation strip 32 / fixed plate 12. The first conductive terminal 51 is connected to the base plate 11 by a first fastener, which is a bolt and a nut.
[0081] Reference Figure 7 and Figure 9 The second conductive terminal 52 extends downwards outside the housing 54. The portion of the second conductive terminal 52 extending outside the housing 54 passes through the current transformer 14, and the portion of the second conductive terminal 52 extending outside the housing 54 is located between the second isolation strip 42 and the adjacent second isolation strip 42 / fixed plate 12. The second conductive terminal 52 is connected to the base plate 11 by a second fastener, which is a bolt and a nut.
[0082] Reference Figure 7 and Figure 9 The closing / opening assembly 53 is located between the first conductive terminal 51 and the second conductive terminal 52. The closing / opening assembly 53 is used to connect or disconnect the first conductive terminal 51 and the second conductive terminal 52.
[0083] Reference Figure 7 and Figure 9 The upper surface of the housing 54 has a first arc-extinguishing channel 541. The opening of the first arc-extinguishing channel 541 is located between the mounting block 351 and the first conductive terminal 51. The stop block 3718 can be rotated to the ejection direction of the first arc-extinguishing channel 541. When the circuit breaker performs arc extinguishing, the arc-extinguishing gas flows through the first arc-extinguishing channel 541 and is output to the outside of the circuit breaker. The stop block 3718 blocks the arc-extinguishing gas flow, thereby improving the safety of the circuit breaker during arc extinguishing.
[0084] Reference Figure 7 and Figure 9 A second arc-extinguishing channel 542 is provided on the lower end face of the housing 54. The opening of the second arc-extinguishing channel 542 is located between the base plate 11 and the second conductive terminal 52. A vent hole is provided on the base plate 11, which is aligned with the second arc-extinguishing channel 542, so that when the circuit breaker performs arc extinguishing, the arc-extinguishing airflow passes through the second arc-extinguishing channel 542 and the vent hole and is output to the outside of the circuit breaker.
[0085] Reference Figure 7 Both the first arc-extinguishing channel 541 and the second arc-extinguishing channel 542 are equipped with an arc-extinguishing grid assembly 55 and a throttling plate 56. The throttling plate 56 is located on the side of the arc-extinguishing grid assembly 55 away from the closing / opening assembly 53. The throttling plate 56 has several holes.
[0086] The implementation principle of a circuit breaker according to an embodiment of this application is as follows: The first insulating partition 33 is inserted into the first sliding hole 111 and the second sliding hole 321 from the side opposite to the pull-out direction and extends into the first insertion hole 341. The first slider 331 is further inserted into the second insertion hole 342 to form a bidirectional stop, so that the first insulating partition 33 remains stable under the action of vibration, thermal expansion and contraction and terminal fastening reaction force, thereby continuously maintaining the air gap and creepage path between adjacent poles. The first insulating baffle 31 is positioned by being inserted into the fixing plate 12 through the first mounting assembly 36. The first limiting block 362 and the second limiting block 363 cooperate with the first limiting groove 121 and the second limiting groove 122 respectively to form multi-directional constraints; at the same time, the limiting part 212 of the first fixing block 21 forms a surface contact stop with the first limiting block 362, which hard limits the mounting base 361 and the first insulating baffle 31. When the circuit breaker is installed in the distribution box, the supporting plane of the base plate 11 fits against the bottom wall of the distribution box, and the end of the locking block and the first insulating partition 33 in the insertion direction extends to the supporting plane, so that the first insulating partition 33 forms a continuous isolation boundary at the supporting plane, reducing the possibility of the electric arc or discharge path going around the bottom.
[0087] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0088] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of this application should be included within the protection scope of this application.
Claims
1. A circuit breaker, comprising a base (1), characterized in that: A cover (2) is provided on one side of the base (1). The base (1) includes a base plate (11). Two symmetrical fixing plates (12) are provided on the side of the base plate (11) facing the cover (2). The base plate (11) and the two fixing plates (12) enclose a receiving groove (13). A first fixing block (21) aligned with the fixing plate (12) is provided at the upper end of the cover (2). A first isolation structure (3) is provided on the base (1). The first isolation structure (3) includes a plurality of first isolation strips (32) provided at the end of the base plate (11) facing the fixing plate (12), a first insulating baffle (31) provided at the upper end of the fixing plate (12), and a first insulating baffle (31) provided at the cover. The body (2) has a first isolation block (34) at its upper end and aligned with the first isolation strip (32). The upper end of the first isolation strip (32) is provided with a first insulating partition (33). The receiving groove (13) is provided with a multi-pole main circuit structure (5). The multi-pole main circuit structure (5) is located between the first isolation strip (32) and the adjacent first isolation strip (32) / fixed plate (12). The multi-pole main circuit structure (5) includes a housing (54). The housing (54) is provided with a first conductive terminal (51). The first conductive terminal (51) extends upward to the outside of the housing (54) and is located between the first isolation strip (32) and the adjacent first isolation strip (32) / fixed plate (12).
2. A circuit breaker according to claim 1, characterized in that: The first insulating partition (33) is provided with a first slider (331) on the side facing the cover (2). The base (1) is provided with a first sliding hole (111) for inserting the first insulating partition (33) on the end face facing the first isolation strip (32). The first isolation strip (32) is provided with a second sliding hole (321) for inserting the first insulating partition (33) on the end face facing the base (1). The first isolation block (34) is provided with a first insertion hole (341) for inserting the first insulating partition (33) and a second insertion hole (342) for inserting the first slider (331) on the side away from the first isolation strip (32). The first slider (331) and the second insertion hole (342) form a stop fit in the direction close to the cover (2) and in the direction away from the cover (2).
3. A circuit breaker according to claim 2, characterized in that: The end face of the base plate (11) away from the first isolation strip (32) is set as a support plane. A locking block is provided in the first sliding hole (111). A gap is left between the locking block and the lower inner wall of the first sliding hole (111). A slot for the locking block to be inserted is opened on the first insulating partition (33). The end face of the locking block away from the cover (2) and the end face of the first insulating partition (33) along the insertion direction both extend to the support plane.
4. A circuit breaker according to claim 3, characterized in that: A first mounting assembly (36) connecting the first insulating baffle (31) and the fixing plate (12) is provided. The first mounting assembly (36) includes a mounting base (361) and a second limiting block (363) disposed on the side of the first insulating baffle (31) facing the first insulating partition (33). The mounting base (361) has a mounting groove (3611) for the fixing plate (12) to be inserted on the side away from the first insulating baffle (31). The mounting groove (3611) passes through the mounting base (361) in the direction of the first insulating baffle (31). The mounting groove (3611) is provided with a first limiting block (362) on the inner wall near the first isolation strip (32). The fixing plate (12) has a first limiting groove (121) for the first limiting block (362) to be inserted on the side facing the first isolation strip (32). The fixing plate (12) has a second limiting groove (122) for the second limiting block (363) to be inserted on the side away from the first isolation strip (32). The first fixing block (21) is located on the path of the first limiting block (362) moving away from the bottom plate (11).
5. A circuit breaker according to claim 4, characterized in that: The first fixing block (21) is provided with a limiting part (212) that is inserted into the first limiting groove (121) on the side facing the fixing plate (12). The limiting part (212) is located on the path of the first limiting block (362) moving away from the bottom plate (11).
6. A circuit breaker according to claim 1, characterized in that: The first isolation structure (3) further includes a first sealing component (35), which includes a mounting block (351) disposed on the upper end of the cover (2) and an operating plate (352) disposed on one end of the first insulating partition (33) along the pull-out direction. The mounting block (351) is located between the first isolation block (34) and the adjacent first isolation block (34) / first fixing block (21). The mounting block (351) has a mounting notch (3511) on the side away from the cover (2). The operating plate (352) is provided with an operating element (37) for sliding into the mounting notch (3511) and closing the mounting notch (3511). The operating plate (352) has an operating groove (3525) on the side facing the cover (2). The operating component (37) includes a closed plate (371) slidably disposed in the operating groove (3525). A closed block (372) adapted to the installation notch (3511) is provided on the side of the closed plate (371) away from the bottom wall of the operating groove (3525). An operating hole (3526) communicating with the operating groove (3525) is provided on the side of the operating plate (352) away from the first insulating partition (33). The operating hole (3526) is elongated. An operating rod (373) inserted into the operating hole (3526) is provided on the operating component (37). The operating rod (373) is slidably disposed in the operating hole (3526). A locking component (38) for restricting the movement of the operating component (37) is provided on the operating plate (352).
7. A circuit breaker according to claim 6, characterized in that: The first isolation strip (32) and the fixing plate (12) are both provided with reinforcing strips (323) on the end faces of the mounting block (351). The reinforcing strips (323) are located on the side of the mounting block (351) facing the base (1). One side of the reinforcing strips (323) is connected to the mounting block (351). The other side of the reinforcing strips (323) extends to the end face of the first isolation strip (32) / fixing plate (12) facing the base (1). The direction of the reinforcing strips (323) facing the mounting notch (3511) is an arc-shaped surface. The side of the closing block (372) facing the reinforcing strips (323) is provided with an elastic locking plate (3713). The side of the locking plate (3713) away from the closing block (372) is provided with a slot (3714) for the reinforcing strips (323) to be inserted.
8. A circuit breaker according to claim 7, characterized in that: The operating groove (3525) has a groove (3527) on the inner wall facing the first insulating partition (33). The locking member (38) includes a locking block (381) and a locking spring (382) disposed in the groove (3527). The locking spring (382) is in a compressed state. One end of the locking spring (382) is fixedly connected to the bottom wall of the groove (3527), and the other end of the locking spring (382) is fixedly connected to the locking block (381). The locking block (381) has a chamfer. The chamfer bevel is disposed at the junction of the side of the locking block (381) away from the bottom wall of the operating groove (3525) and the side of the locking block (381) away from the locking spring (382). The closing plate (371) has a locking groove (3711) for the locking block (381) to be inserted. When the locking block (381) is inserted into the locking groove (3711), the operating member (37) is in a retracted state.
9. A circuit breaker according to claim 8, characterized in that: The bottom wall of the locking groove (3711) is provided with a through hole (3712), and the operating rod (373) is disposed in the through hole (3712). The opening shape of the locking groove (3711) is not smaller than the opening shape of the groove (3527). An operating block (3731) with the same opening shape as the locking groove (3711) is provided in the locking groove (3711), and one end of the operating block (3731) is connected to the operating rod (373).
10. A circuit breaker according to claim 9, characterized in that: The housing (54) is provided with a second conductive terminal (52) and a closing / opening assembly (53) for switching the first conductive terminal (51) and the second conductive terminal (52) on and off. The second conductive terminal (52) extends downward outside the housing (54). The upper end of the housing (54) is provided with a first arc-extinguishing channel (541). The opening of the first arc-extinguishing channel (541) is located between the mounting block (351) and the first conductive terminal (51). The first arc-extinguishing channel (541) is provided with an arc-extinguishing grid assembly (55) and a throttling plate (56). The throttling plate (56) is located on the side of the arc-extinguishing grid assembly (55) away from the closing / opening assembly (53).