A molded case circuit breaker conduction system

Abstract

The utility model discloses a kind of moulded case circuit breaker conducting systems, including base, multiple contact cavities are formed by multiple arrangement settings baffle in the base, multiple rotating cavities are opened in the base middle part in contact cavity opposite position, movable contact assembly is rotatably connected in the rotating cavity, static contact assembly that is installed in contact cavity is cooperated with movable contact assembly and realizes on-off, connection position is opened in the base surface front end, the static contact assembly includes static contact, first arc-extinguishing chamber and fixed baffle, one end of the static contact is set in contact cavity, the other end of the static contact extends to connection position, first arc-extinguishing chamber is installed below static contact, fixed baffle is arranged in first arc-extinguishing chamber opposite position on the surface of static contact upper side, and the bottom of fixed baffle is contacted with the outer wall of first arc-extinguishing chamber. By setting two arc-extinguishing chamber arrangement and positioning, the breaking capacity, safety reliability and service life of moulded case circuit breaker are significantly improved.

Description

Technical Field

[0001] This utility model relates to the field of molded case circuit breaker technology, specifically to a conductive system for a molded case circuit breaker. Background Technology

[0002] Molded case circuit breakers (MCCBs) are commonly used electrical distribution protection devices. They provide power supply to the load and overload and short-circuit protection, and are widely used in power distribution systems. Compared with miniature circuit breakers of the same specifications, MCCBs have the advantages of larger breaking current, stronger overload capacity, and more stable operation.

[0003] However, when existing molded case circuit breakers interrupt large fault currents, a large number of electric arcs are generated. Under strong air pressure, the arcs will quickly spread outwards. If there are gaps between the three phases of the molded case circuit breaker, the dispersed arcs can easily cause internal short circuits, reducing the circuit breaker's breaking capacity. Summary of the Invention

[0004] The purpose of this invention is to provide a conductive system for a molded case circuit breaker to address the problem mentioned in the background art: when the fault current is large, the existing molded case circuit breaker interrupts a large current, resulting in the generation of numerous electric arcs. Under strong air pressure, the arcs quickly spread outwards. If there are gaps between the three phases of the molded case circuit breaker, the dispersed arcs can easily cause internal short circuits, reducing the circuit breaker's breaking capacity.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a conductive system for a molded case circuit breaker, comprising a base, wherein multiple contact cavities are formed within the base by multiple arranged partitions, and multiple rotating cavities are provided in the middle of the base at opposite positions to the contact cavities. A moving contact assembly is rotatably connected within each rotating cavity, and a stationary contact assembly that cooperates with the moving contact assembly to achieve switching is installed within each contact cavity. A connection position is provided at the front end of the base surface. The stationary contact assembly includes a stationary contact, a first arc-extinguishing chamber, and a fixed partition. One end of the stationary contact is disposed within the contact cavity, and the other end of the stationary contact extends into the connection position. The first arc-extinguishing chamber is installed below the stationary contact, and a fixed partition is provided above the surface of the stationary contact at an opposite position to the first arc-extinguishing chamber. The bottom of the fixed partition is in contact with the outer wall of the first arc-extinguishing chamber.

[0006] Preferably, the stationary contact includes a fixing part, a connecting part, and a contact part. One end of the connecting part is fixedly connected to the fixing part, and the other end of the connecting part is fixedly connected to the contact part that folds inward downward. A stationary contact is fixedly connected to the middle of the surface of the contact part.

[0007] Preferably, the surface of the fixing part is provided with a fixing hole, and the surface of the connecting part is provided with a first clearance opening.

[0008] Preferably, the first arc-extinguishing chamber is installed above the surface of the contact portion, and a first limiting plate is fixedly connected to both sides of the bottom of the fixed partition, with the inner wall of the first limiting plate in contact with the outer walls of both sides of the first arc-extinguishing chamber. A second limiting plate is fixedly connected to one end of the bottom surface of the fixed partition, with the inner wall of the second limiting plate in contact with the outer wall of one end of the first arc-extinguishing chamber. A second clearance opening is provided on the surface of the fixed partition, and the second clearance opening and the first clearance opening are at the same horizontal line.

[0009] Preferably, a second arc-extinguishing chamber is installed above the fixed partition in the contact cavity.

[0010] Preferably, an insulating plate is snapped into place at the connection between the contact cavity and the connection position within the base.

[0011] Preferably, a fixing cylinder for fixing the stationary contact is fixedly connected to the surface of the connection position, and the outer wall of the fixing cylinder is in contact with the inner wall of the fixing hole.

[0012] Preferably, the moving contact assembly includes a moving contact and a rotating shaft. The rotating shaft is rotatably connected to the rotating cavity. The moving contact is connected to the rotating shaft at a position opposite to the contact cavity. The moving contact moves within a first clearance opening and a second clearance opening. A moving contact that mates with the stationary contact is fixedly connected to the surface of the moving contact.

[0013] Beneficial effects

[0014] Compared with existing technologies, the beneficial effects of this utility model are as follows:

[0015] This invention achieves a multi-isolation structure by setting up partitions and fixed partitions, and optimizes the arrangement and positioning of the two arc-extinguishing chambers. At the same time, it sets up key insulating plates and a fixed cylinder for stable contact fixing, which effectively solves the core problem of phase-to-phase short circuit caused by arc diffusion during high current interruption. It significantly improves the breaking capacity, safety, reliability and service life of the molded case circuit breaker, while maintaining the compactness and stability of the structure. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall mating structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the mating structure of the moving contact assembly and the stationary contact assembly of this utility model;

[0018] Figure 3 This is a schematic diagram of the static contact assembly structure of this utility model;

[0019] Figure 4 This is an exploded structural diagram of the stationary contact assembly of this utility model;

[0020] Figure 5This is a schematic diagram of the base structure of this utility model.

[0021] The correspondence between the labels and component names in the attached figures is as follows:

[0022] 1. Base; 2. Stationary contact assembly; 3. Moving contact assembly; 4. Second arc-extinguishing chamber; 11. Partition plate;

[0023] 12. Contact cavity; 13. Rotating cavity; 14. Connection position; 15. Insulating plate; 21. Stationary contact;

[0024] 22. First arc-extinguishing chamber; 23. Fixed partition; 31. Moving contact; 32. Rotating shaft; 141. Fixed cylinder;

[0025] 211. Fixing part; 212. Connecting part; 213. Contact part; 214. First clearance opening; 215. Fixing hole;

[0026] 216. Stationary contact point; 231. First limiting plate; 232. Second limiting plate; 233. Second clearance opening;

[0027] 311. Moving contact. Detailed Implementation

[0028] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "front," "rear," "inner," "outer," "vertical," and "horizontal," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] like Figure 1-5This is a schematic diagram of the conductive system of a molded case circuit breaker according to a preferred embodiment of the present invention. In this embodiment, the conductive system includes a base 1. Multiple independent contact cavities 12 are formed inside the base 1 by multiple longitudinally parallel partitions 11. A rotating cavity 13 is provided in the middle of the base 1, corresponding to each contact cavity 12. A connection position 14 for connecting external wires is provided on the front surface of the base 1. An insulating plate 15 is snapped into the connection channel between the contact cavity 12 and the connection position 14 to achieve electrical isolation. A moving contact assembly 3 is rotatably connected inside the rotating cavity 13. A stationary contact assembly 2, which cooperates with the moving contact assembly 3 to achieve switching, is installed inside the contact cavity 12. The stationary contact assembly 2 includes a stationary contact 21, a first arc-extinguishing chamber 22, and a fixed partition 23. The stationary contact 21 is integrally formed by a fixing part 211, a connecting part 212, and a contact part 213. The fixing part 211 is located in the area of ​​the connection position 14, and its surface has a fixing hole 215. The connecting portion 212 extends from the fixing portion 211, passes through the insulating plate 15, and enters the contact cavity 12. A first clearance opening 214 is provided on its surface. The end of the connecting portion 212 folds downwards and inwards to form a contact portion 213. A stationary contact 216 is fixed at the center of the upper surface of the contact portion 213. The first arc-extinguishing chamber 22 is installed above the contact portion 213. The fixing partition 23 is positioned above the surface of the stationary contact 21, relative to the first arc-extinguishing chamber 22, and covers the first arc-extinguishing chamber 22. Its bottom sides extend downwards to form first limiting plates 231, which are in close contact with the outer walls of both sides of the first arc-extinguishing chamber 22. One bottom end extends downwards to form a second limiting plate 232, which is in close contact with one end of the outer wall of the first arc-extinguishing chamber 22. The first limiting plate 231 and the second limiting plate 232 together achieve the positioning and limiting of the first arc-extinguishing chamber 22. The surface of the fixed partition 23 is provided with a second clearance opening 233, which is at the same horizontal line as the first clearance opening 214 on the stationary contact connection part 212.

[0031] In this embodiment, the second arc-extinguishing chamber 4 is installed inside the contact cavity 12, located above the fixed partition 23. The fixed partition 23 not only serves a positioning function but also effectively seals the upper space of the first arc-extinguishing chamber. This structure forces the arc to be strongly constrained and guided into the slit of the first arc-extinguishing chamber for cutting, cooling, and deionization, greatly accelerating the arc extinguishing process.

[0032] In this embodiment, the fixing cylinder 141 is fixedly connected to the surface of the connection position 14, and its outer wall is tightly inserted into the fixing hole 215 of the stationary contact fixing part 211, so as to achieve precise fixing and limiting of the stationary contact 21.

[0033] In this embodiment, the moving contact assembly 3 includes a moving contact 31 and a rotating shaft 32. The rotating shaft 32 is rotatably connected to the rotating cavity 13 in the middle of the base 1. The moving contact 31 is fixed on the rotating shaft 32, and each moving contact 31 is located in a corresponding contact cavity 12. The free end of the moving contact 31 passes through the first clearance opening 214 and the second clearance opening 233, and can move within them. A moving contact point 311 is fixed on the moving contact 31, and the moving contact point 311 presses against the stationary contact point 216 to achieve circuit conduction.

[0034] Working principle:

[0035] When closed, the rotating shaft 32 drives the moving contact 31 to rotate, so that the moving contact 311 presses against the stationary contact 216, thus making the circuit conduction.

[0036] When disconnected, the rotating shaft 32 drives the moving contact 31 to rotate in the opposite direction, and the moving contact 311 quickly separates from the stationary contact 216. The electric arc generated during the disconnection process is drawn into the area between the first arc-extinguishing chamber 22 and the second arc-extinguishing chamber 4 and is divided, cooled and extinguished by the partition 11, the fixed partition 23 and the arc-extinguishing grid.

[0037] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present utility model. It should not be construed that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted by the present utility model.

Claims

1. A conductive system for a molded case circuit breaker, comprising a base (1), characterized in that: Multiple contact cavities (12) are formed within the base (1) by multiple arranged partitions (11). Multiple rotating cavities (13) are opened in the center of the base (1) at positions opposite to the contact cavities (12). A moving contact assembly (3) is rotatably connected within each rotating cavity (13). A stationary contact assembly (2) is installed within each contact cavity (12) to cooperate with the moving contact assembly (3) to achieve on / off switching. A connection position (14) is opened at the front end of the surface of the base (1). The stationary contact assembly (2) contains... The device includes a stationary contact (21), a first arc-extinguishing chamber (22), and a fixed partition (23). One end of the stationary contact (21) is disposed in the contact cavity (12), and the other end of the stationary contact (21) extends into the connection position (14). The first arc-extinguishing chamber (22) is installed below the stationary contact (21). A fixed partition (23) is disposed above the surface of the stationary contact (21) at a position opposite to the first arc-extinguishing chamber (22). The bottom of the fixed partition (23) is in contact with the outer wall of the first arc-extinguishing chamber (22).

2. The conductive system of a molded case circuit breaker according to claim 1, characterized in that: The stationary contact (21) includes a fixing part (211), a connecting part (212) and a contact part (213). The connecting part (212) is fixedly connected to the fixing part (211) at one end and to the contact part (213) which is folded inward downward at the other end. A stationary contact (216) is fixedly connected to the middle of the surface of the contact part (213).

3. The conductive system of a molded case circuit breaker according to claim 2, characterized in that: The fixing part (211) has a fixing hole (215) on its surface, and the connecting part (212) has a first clearance opening (214) on its surface.

4. The conductive system of a molded case circuit breaker according to claim 1, characterized in that: The first arc-extinguishing chamber (22) is installed above the surface of the contact part (213). The bottom sides of the fixed partition (23) are fixedly connected to the first limiting plate (231), and the inner wall of the first limiting plate (231) is in contact with the outer walls of the two sides of the first arc-extinguishing chamber (22). The bottom surface of the fixed partition (23) is fixedly connected to the second limiting plate (232), and the inner wall of the second limiting plate (232) is in contact with the outer wall of one end of the first arc-extinguishing chamber (22). The surface of the fixed partition (23) is provided with a second clearance opening (233), and the second clearance opening (233) and the first clearance opening (214) are on the same horizontal line.

5. The conductive system of a molded case circuit breaker according to claim 1, characterized in that: A second arc-extinguishing chamber (4) is installed above the fixed partition (23) inside the contact cavity (12).

6. The conductive system of a molded case circuit breaker according to claim 1, characterized in that: An insulating plate (15) is snapped into place at the connection between the contact cavity (12) and the connection position (14) inside the base (1).

7. The conductive system of a molded case circuit breaker according to claim 6, characterized in that: The surface of the connection position (14) is fixedly connected to a fixing cylinder (141) for fixing the stationary contact (21), and the outer wall of the fixing cylinder (141) is in contact with the inner wall of the fixing hole (215).

8. The conductive system of a molded case circuit breaker according to claim 1, characterized in that: The moving contact assembly (3) includes a moving contact (31) and a rotating shaft (32). The rotating shaft (32) is rotatably connected to the rotating cavity (13). The moving contact (31) is connected to the rotating shaft (32) at a position opposite to the contact cavity (12). The moving contact (31) moves within the first clearance opening (214) and the second clearance opening (233). The surface of the moving contact (31) is fixedly connected to a moving contact (311) that engages with the stationary contact (216).

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