A through-core current transformer structure and a low-current double-break molded case circuit breaker

Abstract

This utility model relates to the field of circuit breaker technology, and in particular to a through-hole current transformer structure and a small current double-break molded case circuit breaker. It includes a bracket, an upper terminal block, a lower terminal block, a current transformer body, and a flexible conductor. The bracket has a cavity with an upper insertion slot on the top wall and a lower insertion slot on the bottom wall. The current transformer body is housed within the cavity. The flexible conductor passes through the through-hole of the current transformer body at least twice. One end of the upper terminal block and one end of the lower terminal block are respectively inserted into the upper and lower insertion slots, while the other ends of the upper and lower terminal blocks extend outwards from both sides of the bracket. Both ends of the flexible conductor are connected to the upper and lower terminal blocks, respectively. This application uses a flexible conductor to pass through the current transformer body, which is convenient and reduces production costs. Furthermore, the upper and lower terminal blocks support and fix the bracket and the current transformer body, solving the problem in the prior art where the bracket cannot be fixed after the flexible conductor is passed through.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a through-core current transformer structure and a low-current double-break molded case circuit breaker. Background Technology

[0002] Molded case circuit breakers (MCCBs) use current transformers for current sampling. For double-break MCCBs, in high-current double-break MCCBs, since the current transformer only needs to be threaded once, a rigid conductor (e.g., copper busbar) is typically used for threading. The rigid conductor supports and fixes the current transformer's frame after installation. However, for low-current double-break MCCBs, the current transformer needs to be threaded multiple times. Traditional methods still use rigid conductors to achieve this multiple threading process. Figure 1 As shown, a rigid conductor consists of multiple bent conductor segments that pass through the core. After passing through, these bent conductor segments need to be welded, which is a difficult process and increases production costs. Using a flexible conductor as the core can solve the problem of multiple core passes, but the flexible conductor cannot support and fix the bracket (transformer frame). Screws or similar structures are required to fix the bracket; otherwise, the transformer will loosen within the circuit breaker body. However, there is no space designed for screws or similar structures to fix the bracket in a low-current double-break molded case circuit breaker. Therefore, the drawbacks are obvious, and a solution is urgently needed. Utility Model Content

[0003] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide a through-core current transformer structure and a low-current double-break molded case circuit breaker.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A through-hole current transformer structure includes a bracket, an upper terminal block, a lower terminal block, a current transformer body, and a flexible conductor. The bracket has a cavity in the middle, with an upper insertion slot on the top wall and a lower insertion slot on the bottom wall. The current transformer body is housed in the cavity. The flexible conductor passes through the through-hole of the current transformer body at least twice. One end of the upper terminal block is inserted into the upper insertion slot, and the other end of the upper terminal block extends out of one side of the bracket. One end of the lower terminal block is inserted into the lower insertion slot, and the other end of the lower terminal block extends out of the other side of the bracket. The two ends of the flexible conductor are connected to the upper terminal block and the lower terminal block, respectively.

[0006] Furthermore, an upper limit plug is detachably connected to the top of the bracket, which is used to limit the upper terminal block within the upper insertion slot.

[0007] Furthermore, the upper connector is provided with an upper limit notch, and the upper limit plug can extend into the upper insertion slot and the upper limit notch.

[0008] Furthermore, the top surface of the bracket is provided with an upper insertion hole that communicates with the upper insertion slot, and the upper limit plug is detachably inserted into the upper insertion hole.

[0009] Furthermore, a lower limit plug is detachably connected to the bottom of the bracket, which is used to limit the lower terminal block within the lower insertion slot.

[0010] Furthermore, the bottom surface of the bracket is provided with a lower insertion hole that communicates with the lower insertion slot, and the lower wiring plate is provided with a limit hole. The lower limit plug can be detachably inserted into the lower insertion hole and can extend into the limit hole and fit the concave and convex shape of the limit hole.

[0011] Furthermore, both the upper and lower wiring boards are equipped with lock holes.

[0012] Furthermore, the soft conductor is a soft copper wire, and both the upper and lower terminal blocks are copper terminal blocks.

[0013] Furthermore, at least one side of the top of the bracket is provided with an insertion guide groove.

[0014] This utility model also provides a low-current double-break molded case circuit breaker, including a circuit breaker body and the aforementioned through-core current transformer structure. One end of the circuit breaker body's housing has three input terminals. Inside the circuit breaker body's housing are a tripping device and a circuit board control box. The other end of the circuit breaker body's housing has three output terminals. There are three through-core current transformer structures, all sharing a single support. The three input terminals, the three through-core current transformer structures, and the three output terminals are arranged in a one-to-one correspondence. The tripping device and the three output terminals... There is a space between the terminals. The through-core current transformer structure and the circuit board control box are both located in the space. The circuit board control box is located above the through-core current transformer structure. The plug of the circuit board control box is inserted into the insertion guide groove of the bracket of the through-core current transformer structure. The three input terminals are respectively connected to the three input connection terminals of the tripping device. The upper terminals of the three through-core current transformer structures are respectively locked to the three output connection terminals of the tripping device by upper locking fasteners. The lower terminals of the three through-core current transformer structures are respectively locked to the three output terminals by lower locking fasteners.

[0015] The beneficial effects of this utility model are as follows: In practical applications, after the soft conductor passes through the through-hole of the transformer body at least twice, the upper and lower terminal blocks are respectively inserted into the upper and lower insertion slots, and the two ends of the soft conductor are welded to the upper and lower terminal blocks respectively. During use, the upper and lower terminal blocks are installed together with the corresponding terminals of external devices (e.g., the output connection terminal of the tripping device of the circuit breaker body and the output terminal of the circuit breaker body) and connected. In this way, after the upper and lower terminal blocks are fixed, the bracket and the transformer body can be supported and fixed, and the through-hole insertion of the soft conductor into the transformer body is more convenient. This utility model uses a soft conductor to pass through the transformer body, which is convenient, simplifies the structure, reduces production and processing costs, and uses the upper and lower terminal blocks to support and fix the bracket and the transformer body, eliminating the need for screws or other fixation methods, thus solving the problem in the prior art where the bracket could not be fixed after the soft conductor was passed through. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of a current transformer with a through-hole design, according to existing technology.

[0017] Figure 2 This is a three-dimensional structural diagram of the low-current double-break molded case circuit breaker of this utility model.

[0018] Figure 3 This is a three-dimensional structural schematic diagram of the low-current double-break molded case circuit breaker of this utility model from another perspective.

[0019] Figure 4 This is a three-dimensional structural diagram of the low-current double-break molded case circuit breaker of this utility model after the outer casing is hidden.

[0020] Figure 5 This is a three-dimensional structural diagram of the through-core current transformer structure of this utility model.

[0021] Figure 6 This is a three-dimensional structural diagram of the through-core transformer structure of this utility model from another perspective.

[0022] Figure 7 This is a three-dimensional structural diagram of the bracket of this utility model.

[0023] Figure 8 This is a three-dimensional structural diagram of the upper wiring board of this utility model.

[0024] Figure 9 This is a three-dimensional structural diagram of the lower wiring board of this utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Bracket; 2. Upper terminal block; 3. Lower terminal block; 4. Current transformer body; 5. Flexible conductor; 6. Cavity; 8. Upper insertion slot; 9. Lower insertion slot; 10. Upper limit switch plug; 11. Upper limit switch notch; 12. Upper insertion hole; 13. Lower limit switch plug; 14. Lower insertion hole; 15. Limit hole; 16. Locking hole; 17. Insertion guide groove; 18. Input terminal block; 19. Tripping device; 20. Circuit board control box; 21. Output terminal block; 22. Accommodation space; 24. Lower locking fastener; 25. Rigid conductor; 27. Circuit breaker body. Detailed Implementation

[0027] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0028] like Figures 2 to 9 As shown, the present invention provides a through-hole current transformer structure, which includes a bracket 1, an upper terminal block 2, a lower terminal block 3, a current transformer body 4, and a flexible conductor 5. A cavity 6 is provided in the middle of the bracket 1. An upper insertion groove 8 is provided on the top wall of the cavity 6, and a lower insertion groove 9 is provided on the bottom wall of the cavity 6. The current transformer body 4 is housed in the cavity 6. The flexible conductor 5 passes through the through-hole of the current transformer body 4 at least twice, that is, the flexible conductor 5 passes through the current transformer body 4 at least twice. One end of the upper terminal block 2 is inserted into the upper insertion groove 8, and the other end of the upper terminal block 2 extends out of one side of the bracket 1. One end of the lower terminal block 3 is inserted into the lower insertion groove 9, and the other end of the lower terminal block 3 extends out of the other side of the bracket 1. The two ends of the flexible conductor 5 are respectively connected to the upper terminal block 2 and the lower terminal block 3. Preferably, the two ends of the flexible conductor 5 are welded to the upper terminal block 2 and the lower terminal block 3 respectively.

[0029] In practical applications, after the soft conductor 5 passes through the through hole of the transformer body 4 at least twice, the upper terminal block 2 and the lower terminal block 3 are respectively inserted into the upper insertion slot 8 and the lower insertion slot 9. The two ends of the soft conductor 5 are respectively welded to the upper terminal block 2 and the lower terminal block 3. In use, the upper terminal block 2 and the lower terminal block 3 are respectively installed together with the corresponding terminals of external devices / equipment (such as the output connection terminal of the tripping device 19 of the circuit breaker body 27 and the output terminal 21 of the circuit breaker body 27) and connected. In this way, after the upper terminal block 2 and the lower terminal block 3 are fixed, the bracket 1 and the transformer body 4 can be supported and fixed, and the soft conductor 5 passes through the through hole of the transformer body 4 more conveniently. The current transformer structure uses a soft conductor 5 to pass through the current transformer body 4. Compared with the hard conductor 25 in the prior art, the current transformer structure is more convenient, simplifies the structure, and reduces the production and processing costs. Furthermore, the upper terminal plate 2 and the lower terminal plate 3 are used to support and fix the bracket 1 and the current transformer body 4, eliminating the need for screws or other means to fix the bracket 1. This solves the problem in the prior art where the bracket 1 cannot be fixed after using a soft conductor 5 to pass through the current transformer.

[0030] Specifically, bracket 1 is a plastic frame, which serves to provide insulation and reduce weight.

[0031] In this embodiment, an upper limit plug 10 is detachably connected to the top of the bracket 1. The upper limit plug 10 is used to limit the upper connector 2 within the upper insertion slot 8. After one end of the upper connector 2 is inserted into the upper insertion slot 8, the upper limit plug 10 is installed on the bracket 1 and limits the upper connector 2 within the upper insertion slot 8 to ensure the positional accuracy and stability of the upper connector 2 on the bracket 1, making it less likely for the upper connector 2 to detach from the bracket 1.

[0032] Specifically, the upper limit plug 10 is a pin. The pin has a simple structure, is easy to source, and has a low cost.

[0033] In this embodiment, the upper connector 2 is provided with an upper limit notch 11, and the upper limit plug 10 can extend into the upper insertion slot 8 and the upper limit notch 11. In practical applications, the upper limit plug 10 is inserted into the upper limit notch 11, and the outer wall of the upper limit plug 10 abuts against the inner wall of the upper limit notch 11 to limit the upper connector 2 within the upper insertion slot 8, further improving the firmness of the upper connector 2 installed in the upper insertion slot 8.

[0034] In this embodiment, the top surface of the bracket 1 has an upper insertion hole 12 that communicates with the upper insertion slot 8, and the upper limit plug 10 is detachably inserted into the upper insertion hole 12. This structural design facilitates the assembly and disassembly of the upper limit plug 10 and the bracket 1.

[0035] In this embodiment, a lower limit plug 13 is detachably connected to the bottom of the bracket 1. The lower limit plug 13 is used to limit the lower connector 3 within the lower insertion slot 9. After one end of the lower connector 3 is inserted into the lower insertion slot 9, the lower limit plug 13 is installed on the bracket 1 and limits the lower connector 3 within the lower insertion slot 9 to ensure the positional accuracy and stability of the lower connector 3 on the bracket 1, making it less likely for the lower connector 3 to detach from the bracket 1.

[0036] In this embodiment, the bottom surface of the bracket 1 has a lower insertion hole 14 communicating with the lower insertion slot 9. The lower connector plate 3 is provided with a limiting hole 15. The lower limiting plug 13 is detachably inserted into the lower insertion hole 14. The lower limiting plug 13 can extend into the limiting hole 15 and fits the limiting hole 15 with a concave-convex fit. In practical applications, the lower limiting plug 13 is inserted into the lower insertion hole 14 and extends into the limiting hole 15. The outer wall of the lower limiting plug 13 abuts against the inner wall of the limiting hole 15 to limit the lower connector plate 3 in the lower insertion slot 9, further improving the firmness of the lower connector plate 3 installed in the lower insertion slot 9.

[0037] Specifically, the lower insertion hole 14 is a screw hole, and the lower limit plug 13 is a screw, which is threaded into the screw hole. This structural design allows for easy assembly and disassembly, provides a secure connection, and is cost-effective.

[0038] In this embodiment, both the upper terminal block 2 and the lower terminal block 3 are provided with locking holes 16. The locking holes 16 facilitate the fasteners to lock the upper terminal block 2 or the lower terminal block 3 onto the terminals of external devices / equipment.

[0039] In this embodiment, the soft conductor 5 is a soft copper wire, and both the upper terminal block 2 and the lower terminal block 3 are copper terminal blocks.

[0040] In this embodiment, at least one side of the top of the bracket 1 is provided with an insertion guide groove 17, which is used for the insertion of the circuit board control box 20 into the insertion guide groove 17.

[0041] This utility model also provides a low-current double-break molded case circuit breaker, including a circuit breaker body 27 and the aforementioned through-core current transformer structure. One end of the circuit breaker body 27 has three input terminals 18. Inside the circuit breaker body 27's casing are a tripping device 19 and a circuit board control box 20. The other end of the circuit breaker body 27's casing has three output terminals 21. There are three through-core current transformer structures, all sharing a single support 1. The three input terminals 18, the three through-core current transformer structures, and the three output terminals 21 are respectively and correspondingly arranged. The tripping device 19 is connected to the three output terminals... A receiving space 22 is provided between the terminals 21. The through-core transformer structure and the circuit board control box 20 are both located within the receiving space 22. The circuit board control box 20 is located above the through-core transformer structure. The insert plate of the circuit board control box 20 is inserted into the insertion guide groove 17 of the bracket 1 of the through-core transformer structure. The three input terminals 18 are respectively connected to the three input connection terminals of the tripping device 19. The upper terminal plates 2 of the three through-core transformer structures are respectively locked to the three output connection terminals of the tripping device 19 by upper locking fasteners. The lower terminal plates 3 of the three through-core transformer structures are respectively locked to the three output terminals 21 by lower locking fasteners 24. This structural design allows the through-core transformer structure to be supported and fixed in the receiving space 22 of the circuit breaker body 27 without screws or other structures. This solves the problem in the prior art that small current double-break molded case circuit breakers can only be fixed to the bracket 1 by using a hard conductor 25 through the core, and cannot be fixed to the bracket 1 by using a soft conductor 5 through the core.

[0042] All technical features in this embodiment can be freely combined according to actual needs.

[0043] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A core-form transformer structure, characterized by: The device includes a bracket (1), an upper terminal block (2), a lower terminal block (3), a current transformer body (4), and a flexible conductor (5). The bracket (1) has a cavity (6) in the middle. The top wall of the cavity (6) is provided with an upper insertion slot (8), and the bottom wall of the cavity (6) is provided with a lower insertion slot (9). The current transformer body (4) is housed in the cavity (6). The flexible conductor (5) passes through the through hole of the current transformer body (4) at least twice. One end of the upper terminal block (2) is inserted into the upper insertion slot (8), and the other end of the upper terminal block (2) extends out of one side of the bracket (1). One end of the lower terminal block (3) is inserted into the lower insertion slot (9), and the other end of the lower terminal block (3) extends out of the other side of the bracket (1). The two ends of the flexible conductor (5) are connected to the upper terminal block (2) and the lower terminal block (3) respectively.

2. A core-form transformer structure according to claim 1, characterised in that: The top of the bracket (1) is detachably connected to an upper limit plug (10), which is used to limit the upper terminal block (2) within the upper insertion slot (8).

3. A core-form transformer structure according to claim 2, characterised in that: The upper connector (2) is provided with an upper limit notch (11), and the upper limit plug (10) can extend into the upper plug slot (8) and the upper limit notch (11).

4. A core-form transformer construction as claimed in claim 3, characterised in that: The top surface of the bracket (1) is provided with an upper insertion hole (12) that communicates with the upper insertion slot (8), and the upper limit plug (10) is detachably inserted into the upper insertion hole (12).

5. A structure for a core-forming mutual inductor according to claim 1, characterized in that: The bottom of the bracket (1) is detachably connected to a lower limit plug (13), which is used to limit the lower terminal block (3) within the lower insertion slot (9).

6. A core-form transformer construction as claimed in claim 5, characterised in that: The bottom surface of the bracket (1) is provided with a lower insertion hole (14) that communicates with the lower insertion slot (9). The lower wiring plate (3) is provided with a limit hole (15). The lower limit plug (13) is detachably inserted into the lower insertion hole (14). The lower limit plug (13) can extend into the limit hole (15) and is compatible with the limit hole (15).

7. A core-form transformer structure as claimed in claim 1, characterised in that: Both the upper terminal block (2) and the lower terminal block (3) are provided with lock holes (16).

8. A core-form transformer structure as claimed in claim 1, characterised in that: The soft conductor (5) is a soft copper wire, and the upper terminal block (2) and the lower terminal block (3) are both copper terminal blocks.

9. A core-form transformer structure according to any one of claims 1 to 8, characterised in that: The top of the bracket (1) has an insertion guide groove (17) on at least one side.

10. A molded case circuit breaker with small current double break points, characterized by: The circuit breaker includes a circuit breaker body (27) and a through-core transformer structure as described in claim 9. One end of the outer casing of the circuit breaker body (27) has three input terminals (18). Inside the outer casing of the circuit breaker body (27) are a tripping device (19) and a circuit board control box (20). The other end of the outer casing of the circuit breaker body (27) has three output terminals (21). There are three through-core transformer structures, all sharing a single support (1). The three input terminals (18), the three through-core transformer structures, and the three output terminals (21) are respectively arranged in a one-to-one correspondence. A commutator is provided between the tripping device (19) and the three output terminals (21). The space (22) contains the through-core transformer structure and the circuit board control box (20). The circuit board control box (20) is located above the through-core transformer structure. The plug of the circuit board control box (20) is inserted into the insertion guide groove (17) of the bracket (1) of the through-core transformer structure. The three input terminals (18) are respectively connected to the three input connection terminals of the tripping device (19). The upper terminals (2) of the three through-core transformer structures are respectively locked to the three output connection terminals of the tripping device (19) by upper locking fasteners. The lower terminals (3) of the three through-core transformer structures are respectively locked to the three output terminals (21) by lower locking fasteners (24).

Images