Primary and secondary separable molded case circuit breakers

Abstract

This utility model relates to the field of circuit breaker technology, specifically to a primary and secondary separable molded case circuit breaker. The utility model includes a housing, with an outer cover and a hinged cover connected to the front surface of the housing by screws. Several mounting compartments are provided on both the upper and lower surfaces of the housing, and each mounting compartment contains a magnetic blow-out mechanism. A movable slot is provided through the outer wall of the outer cover, and a switch handle is movably installed between the movable slot and the interior of the housing. The magnetic blow-out mechanism includes a magnetic blow-out body one, with a mounting hole through one end of the outer wall space of magnetic blow-out body one. A magnetic blow-out body two is fixedly connected to one end of the outer wall of magnetic blow-out body one, and a groove is provided through the outer wall of magnetic blow-out body two. This utility model, by setting a magnetic blow-out mechanism, can improve arc extinguishing efficiency, reduce arc dwell time, and improve arc extinguishing effect. Furthermore, by setting arc-shaped guide plates one and two, the arc movement path can be extended to accelerate cooling.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically to a primary and secondary separable molded case circuit breaker. Background Technology

[0002] A molded case circuit breaker is an automatic control device in a power system. It is used to automatically attempt to reclose the circuit breaker after a short delay following a line fault that causes it to trip, in order to restore power supply. It is mainly used to handle transient faults. If the fault has been eliminated, power supply is restored; if the fault still exists, it will not be reclosed. A molded case circuit breaker with separable primary and secondary circuits is a type of circuit breaker that separates the main circuit (primary circuit) from the control circuit (secondary circuit).

[0003] In existing technologies, molded case circuit breakers with separable primary and secondary circuits are prone to generating strong electric arcs when interrupting large currents, leading to contact erosion and shortened lifespan. Traditional arc-extinguishing chambers use a single magnetic blow-out coil, which has problems such as low arc-extinguishing efficiency and long arc stagnation time. Especially in high-frequency reclosing scenarios, they are prone to causing electrical fires. Moreover, the arc-guiding structure in existing technologies is mostly a straight plate type, and the arc diffusion path is uncontrollable, making it difficult to achieve rapid cooling. Utility Model Content

[0004] The purpose of this invention is to provide a primary and secondary separable molded case circuit breaker to solve the problems mentioned in the background art.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A primary and secondary separable molded case circuit breaker includes a housing. The front surface of the housing is connected to an outer cover and a hinged cover by screws. Several mounting compartments are provided on both the upper and lower surfaces of the housing. A magnetic blow mechanism is provided inside each of the mounting compartments. A movable slot is provided through the outer wall of the outer cover. A switch handle is movably installed between the movable slot and the inside of the housing.

[0007] The magnetic blowing mechanism includes a magnetic blowing body one, with an installation hole through one end of the outer wall space of the magnetic blowing body one, and a magnetic blowing body two fixedly connected to one end of the outer wall of the magnetic blowing body one.

[0008] Preferably, the outer wall of the magnetic blower body has a through groove, and a connector is fixedly installed inside the groove.

[0009] Preferably, a plurality of magnetic blowing plates are fixedly installed on the bottom surface of the connector body and at a position between the magnetic blowing body and the installation chamber, and the plurality of magnetic blowing plates cooperate with each other.

[0010] Preferably, the magnetic blower body is provided with a side plate 1 and a side plate 2 on both sides, and an arc-shaped guide plate 1 is fixedly connected to the outer wall of the side plate 1.

[0011] Preferably, an arc-shaped guide plate is fixedly connected to the outer wall of the second side plate, and the arc-shaped guide plate and the arc-shaped guide plate cooperate with each other.

[0012] Preferably, a plurality of arc guide plates are provided between the outer walls of the first side plate and the second side plate, and the plurality of arc guide plates are evenly distributed. A baffle is provided on one side of the plurality of arc guide plates, and the bottom end of the baffle is fixedly connected to the first magnetic blower.

[0013] Preferably, both the outer walls of side plate one and side plate two are provided with a number of insertion holes, and the insertion holes are matched with one end of the arc guide plate.

[0014] The beneficial effects of this utility model are:

[0015] 1. In this utility model, the circuit breaker trips by generating an electric arc that enters the magnetic blow-out mechanism area. A vertical magnetic field is generated by each magnetic blow-out plate in the magnetic blow-out mechanism. Under the action of the Lorentz force, the electric arc is elongated and pushed towards the direction of the first magnetic blow-out body and the arc guide plate. The arc energy is absorbed and dissipated by the first and second magnetic blow-out bodies. The residual ions are discharged through the bottom of the installation chamber and finally extinguished, thus extinguishing the arc. Compared with the existing method of using a single magnetic blow-out coil for arc extinguishing, this method can not only improve the arc extinguishing efficiency but also reduce the arc dwell time and improve the arc extinguishing effect.

[0016] 2. In this utility model, by setting multiple arc guide plates arranged at equal intervals to form a slit channel, the electric arc can be forcibly divided into multiple thin arcs. The divided electric arc moves along the channel between the arc guide plate one and the arc guide plate two. While guiding the electric arc, the movement path of the electric arc can be extended to accelerate cooling. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a partial structural schematic diagram of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of the baffle and the magnetic blower in this utility model;

[0021] Figure 4 This is a structural schematic diagram of the baffle, guide plate and side plate of this utility model;

[0022] Figure 5This is a structural schematic diagram of side plate one, arc-shaped guide plate one, and arc-shaped guide plate two in this utility model;

[0023] Figure 6 This is a schematic diagram of the structure of magnetic blown body one and magnetic blown body two in this utility model;

[0024] Figure 7 This is a cross-sectional view of the magnetic blower body in this utility model.

[0025] The attached figures are labeled as follows:

[0026] 1. Outer shell; 2. Switch handle; 3. Cover; 4. Magnetic blower body one; 5. Mounting chamber; 6. Magnetic blower plate; 7. Groove; 8. Connector; 9. Side plate one; 10. Arc-shaped guide plate one; 11. Baffle; 12. Arc guide plate; 13. Mounting hole; 14. Socket; 15. Arc-shaped guide plate two; 16. Side plate two; 17. Outer cover; 18. Movable slot; 19. Magnetic blower body two. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0028] Primary and secondary separable molded case circuit breakers, such as Figures 1-7 As shown, the device includes an outer casing 1. The front surface of the outer casing 1 is connected to an outer cover 17 and a cover 3 by screws. The outer cover 17 and the cover 3 are connected to the outer casing 1 by screws, which can be easily disassembled and installed for maintenance. Several installation chambers 5 are provided on the upper and lower surfaces of the outer casing 1. The upper and lower symmetrical installation chambers 5 realize a double arc extinguishing channel. Even in the event of a single-sided fault, the breaking capacity of the primary and secondary separable molded case circuit breaker can still be guaranteed. Each of the installation chambers 5 is equipped with a magnetic blow mechanism. The outer wall of the outer cover 17 has a through slot 18. A switch handle 2 is movably installed between the inside of the slot 18 and the inside of the outer casing 1. The magnetic blow mechanism includes a magnetic blow body 1 4. A mounting hole 13 is provided through one end of the space of the outer wall of the magnetic blow body 1 4. The mounting hole 13 is used to connect and install external electrical components. A magnetic blow body 2 19 is fixedly connected to one end of the outer wall of the magnetic blow body 1 4.

[0029] The outer wall of the magnetic blower body 19 has a through groove 7. A connector 8 is fixedly installed inside the groove 7. Several magnetic blower plates 6 are fixedly installed on the bottom surface of the connector 8 and located between the magnetic blower body 1 4 and the installation chamber 5. The magnetic blower plates 6 cooperate with each other. The multiple magnetic blower plates 6 are stacked to enhance the magnetic field strength, which can accelerate the arc away from the contact area. Each magnetic blower plate 6 is embedded into the groove 7 through the connector 8 to form a modular assembly unit, which can be directly replaced as a whole.

[0030] In use, the opening and closing operations of the primary and secondary separable molded case circuit breaker are performed by pushing the switch handle 2. When opening, an electric arc is generated between the contacts. The generated electric arc enters the magnetic blow-out mechanism area. At this time, each magnetic blow-out plate 6 in the magnetic blow-out mechanism generates a vertical magnetic field, which is parallel to the arc axis. Under the action of Lorentz force, the arc is stretched and pushed towards the direction of the magnetic blow-out body 4 and the arc guide plate 12. The arc energy is absorbed and dissipated by the magnetic blow-out body 4 and the magnetic blow-out body 19. The residual ions are discharged through the bottom of the installation chamber 5 and finally extinguished, thus extinguishing the arc. Compared with the existing method of using a single magnetic blow-out coil for arc extinguishing, this method can not only improve the arc extinguishing efficiency, but also reduce the arc dwell time and improve the arc extinguishing effect.

[0031] The magnetic blower body 4 has a side plate 9 and a side plate 16 on both sides. An arc-shaped guide plate 10 is fixedly connected to the outer wall of the side plate 9, and an arc-shaped guide plate 15 is fixedly connected to the outer wall of the side plate 16. The arc-shaped guide plate 10 and the arc-shaped guide plate 15 cooperate with each other to form an arc channel, guide the arc to move in a specific direction, and extinguish the arc.

[0032] Several arc guide plates 12 are provided between the outer walls of side plate 19 and side plate 26, and the arc guide plates 12 are evenly distributed. By setting multiple arc guide plates 12 evenly distributed, the energy density per unit area can be reduced by physically dividing the electric arc. A baffle 11 is provided on one side of the arc guide plates 12, and the bottom end of the baffle 11 is fixedly connected to the magnetic blower 4. The baffle 11 can block the arc return path and protect the bottom structure of the magnetic blower 4.

[0033] Both side plate 9 and side plate 16 have several through-holes 14 on their outer walls, and the through-holes 14 fit one end of the arc guide plate 12. The two ends of the arc guide plate 12 are tightly engaged in the corresponding through-holes 14 on side plate 9 and side plate 16, which can stably install each arc guide plate 12 and achieve welding-free plug-in fixation.

[0034] Specifically, by setting multiple arc guide plates 12 equidistantly arranged to form a slit channel, the electric arc can be forcibly divided into multiple thin arcs. The divided electric arc moves along the channel between the arc guide plate 10 and the arc guide plate 2 15, which can extend the electric arc movement path to accelerate cooling. The baffle 11 blocks the electric arc backflow, ensuring that the electric arc enters the depth of the arc extinguishing zone.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A primary and secondary separable molded case circuit breaker, comprising a housing (1), characterized in that, The front surface of the outer shell (1) is connected to the outer cover (17) and the cover (3) by screws. Several installation compartments (5) are opened on both the upper and lower surfaces of the outer shell (1). A magnetic blow mechanism is installed inside each of the several installation compartments (5). A movable slot (18) is opened through the outer wall of the outer cover (17). A switch handle (2) is movably installed between the movable slot (18) and the inside of the outer shell (1). The magnetic blowing mechanism includes a magnetic blowing body one (4), and an installation hole (13) is provided through one end of the outer wall space of the magnetic blowing body one (4). A magnetic blowing body two (19) is fixedly connected to one end of the outer wall of the magnetic blowing body one (4).

2. The primary and secondary separable molded case circuit breaker according to claim 1, characterized in that, The outer wall of the magnetic blower (19) is provided with a groove (7), and a connector (8) is fixedly installed inside the groove (7).

3. The primary and secondary separable molded case circuit breaker according to claim 2, characterized in that, Several magnetic blowing plates (6) are fixedly installed on the bottom surface of the connector (8) and between the magnetic blowing body (4) and the installation chamber (5), and the several magnetic blowing plates (6) cooperate with each other.

4. The primary and secondary separable molded case circuit breaker according to claim 3, characterized in that, The magnetic blower body (4) is provided with a side plate (9) and a side plate (16) on both sides respectively, and an arc-shaped guide plate (10) is fixedly connected to the outer wall of the side plate (9).

5. The primary and secondary separable molded case circuit breaker according to claim 4, characterized in that, The outer wall of the second side plate (16) is fixedly connected to the second arc-shaped guide plate (15), and the first arc-shaped guide plate (10) and the second arc-shaped guide plate (15) cooperate with each other.

6. The primary and secondary separable molded case circuit breaker according to claim 5, characterized in that, A plurality of arc guide plates (12) are provided between the outer walls of the first side plate (9) and the second side plate (16), and the plurality of arc guide plates (12) are evenly distributed. A baffle (11) is provided on one side of the plurality of arc guide plates (12), and the bottom end of the baffle (11) is fixedly connected to the first magnetic blower (4).

7. The primary and secondary separable molded case circuit breaker according to claim 4, characterized in that, Both the outer walls of the first side plate (9) and the second side plate (16) are provided with a number of slots (14), and the slots (14) are matched with one end of the guide plate (12).

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