An outlet structure for a miniature circuit breaker

Abstract

This utility model relates to an air outlet structure for a miniature circuit breaker. By setting a first air outlet and a second air outlet on the housing, a multi-channel arc-extinguishing path is formed. During the operation of the circuit breaker, the electric arc and heat generated inside can be quickly dissipated through these two air outlets, preventing the airflow from interfering with each other within the arc-extinguishing assembly. This effectively reduces the residence time of the electric arc inside the circuit breaker. The first air guide wall between the arc-extinguishing assembly and the first air outlet, and the second air guide wall between the arc-extinguishing assembly and the second air outlet, play a role in precisely guiding the airflow. When an electric arc is generated, the air guide wall can guide the airflow in an orderly and uniform manner to the arc-extinguishing assembly, forming a stable and suitable airflow field around the arc-extinguishing grid. This airflow field helps to quickly remove the heat and plasma generated by the electric arc, accelerate the arc extinguishing process, improve the arc extinguishing efficiency, reduce the erosion of the internal components of the circuit breaker by the electric arc, and enhance the breaking capacity and reliability of the circuit breaker.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to an outlet structure for a miniature circuit breaker. Background Technology

[0002] In power systems, miniature circuit breakers (MCBs) serve as core protection devices to ensure safe and stable operation. They can quickly disconnect circuits when abnormalities occur. The vent structure plays a crucial role in their heat dissipation, arc extinguishing, and safety protection performance. However, traditional circuit breakers typically use a single vent. Under high load or high current faults, the limited heat dissipation channels prevent timely heat dissipation, leading to a rapid temperature rise. This accelerates the aging of insulation materials, affects the mechanical properties of metal components, damages electrical performance, and shortens service life. While some circuit breakers have multiple vents, their layout is often unreasonable, causing airflow interference, uneven heat dissipation, and low overall heat dissipation efficiency. Furthermore, existing vent structures lack precise design for airflow guidance and pose safety hazards. Residue generated by arc combustion can be ejected by high-speed airflow due to defects in the vent structure, potentially causing short circuits in surrounding equipment and threatening the safety of operators. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide an outlet structure for a miniature circuit breaker that is efficient in heat dissipation, fast in arc extinguishing, and safe and reliable.

[0004] To achieve the above objectives, this utility model adopts a small circuit breaker outlet structure, including a housing with an internal cavity. The housing has a first outlet and a second outlet. An arc-extinguishing assembly is disposed in the internal cavity of the housing. The arc-extinguishing assembly includes multiple parallel arc-extinguishing grids. A first air guide wall is disposed between the arc-extinguishing assembly and the first outlet, and a second air guide wall is disposed between the arc-extinguishing assembly and the second outlet. The housing also has an operating mechanism, a stationary contact, and a moving contact. The operating mechanism includes a handle and a linkage component. The handle is connected to the moving contact through the linkage component and is used to control the opening and closing of the moving contact and the stationary contact.

[0005] Compared with existing technologies, the beneficial effects of the above structure are as follows: By setting a first air outlet and a second air outlet on the housing, a multi-channel arc extinguishing path is formed. During the operation of the circuit breaker, the electric arc and heat generated inside can be quickly dissipated through these two air outlets, preventing the airflow from interfering with each other within the arc extinguishing assembly. This effectively reduces the residence time of the electric arc inside the circuit breaker. The first air guide wall set between the arc extinguishing assembly and the first air outlet, and the second air guide wall set between the arc extinguishing assembly and the second air outlet, play a role in precisely guiding the airflow. When an electric arc is generated, the air guide wall can guide the airflow to the arc extinguishing assembly in an orderly and uniform manner, forming a stable and suitable airflow field around the arc extinguishing grid. This airflow field helps to quickly remove the heat and plasma generated by the electric arc, accelerate the arc extinguishing process, improve the arc extinguishing efficiency, reduce the ablation of internal components of the circuit breaker by the electric arc, and enhance the breaking capacity and reliability of the circuit breaker.

[0006] This utility model is further configured such that the first air outlet is located in the upper region of the arc-extinguishing component, and the second air outlet is located at the bottom of the housing and on one side of the arc-extinguishing component. Both the first and second air guide walls are located on one side of the arc-extinguishing component, with the first air guide wall adjacent to the first air outlet and the second air guide wall adjacent to the second air outlet. By placing the first air outlet in the upper region of the arc-extinguishing component, the second air outlet at the bottom of the housing and on one side of the arc-extinguishing component, and with both the first and second air guide walls located on one side of the arc-extinguishing component and adjacent to their respective air outlets, this layout can precisely guide airflow. When an electric arc is generated, the high-temperature gas around the arc can be quickly discharged through the first air outlet, while the cooled gas is introduced through the second air outlet, forming an effective gas circulation, accelerating arc extinguishing, and improving arc-extinguishing efficiency.

[0007] This invention is further configured with a bifurcated structure at one end of the second air guide wall near the second air outlet. During the break test, this bifurcated structure can disperse the airflow, preventing the airflow from concentrating and impacting the area around the air outlet, reducing sudden changes in airflow velocity, and preventing the residue generated by the electric arc combustion from being directly carried out of the circuit breaker by the high-speed airflow, but instead keeping it inside the circuit breaker, thereby ensuring safe operation.

[0008] This invention further features a second air outlet with its openings arranged in a staggered pattern in the horizontal direction, and adjacent portions in the vertical direction are staggered in height and do not touch each other. This staggered arrangement of the second air outlets in the horizontal and vertical directions allows for a more even distribution of the exhaust airflow in both directions. Furthermore, this arrangement effectively reduces mutual interference between exhaust airflows from adjacent outlets. The staggered and non-contact design of the outlets also increases the difficulty for dust and debris to enter the circuit breaker.

[0009] This utility model is further configured with an arc-blocking assembly on the housing. The arc-blocking assembly includes an arc-blocking iron sheet and an arc-blocking plate. A groove is formed on the arc-blocking plate. The opening and closing operations of the moving contact and the stationary contact occur within the area formed by the arc-blocking assembly. Because the arc-blocking assembly consists of an arc-blocking iron sheet and an arc-blocking plate, the opening and closing operations of the moving contact and the stationary contact occur within its formed area. The arc-blocking iron sheet can quickly conduct magnetism, concentrating the arc energy, while the groove on the arc-blocking plate can guide the arc to move along a specific path. Together, these two elements effectively limit the arc spread range and reduce damage to other components of the circuit breaker. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the internal structure of the shell according to an embodiment of the present invention.

[0011] Figure 2 This is a schematic diagram of the structure of the shell of this utility model, which lacks some of the arc-blocking iron sheets and arc-blocking plates.

[0012] Figure 3 This is a schematic diagram of the internal cavity structure of the shell according to an embodiment of the present invention.

[0013] Figure 4 This is a structural schematic diagram of an embodiment of the present utility model. Detailed Implementation

[0014] like Figures 1-4 As shown, an embodiment of this utility model provides an air outlet structure for a miniature circuit breaker. The structure is based on a housing 1, which has an internal cavity. An arc-extinguishing component 2 is disposed in the internal cavity of the housing 1. A first air outlet 3 and a second air outlet 4 are provided on the housing 1. The first air outlet 3 is located in the upper region of the arc-extinguishing component 2, while the second air outlet 4 is located at the bottom of the housing 1 and on one side of the arc-extinguishing component 2. The opening design of the second air outlet 4 is unique. In the horizontal direction, the two outlets are staggered left and right, and in the vertical direction, the adjacent parts are staggered at different heights and do not contact each other. This layout can ensure that the airflow is evenly distributed and discharged, and can effectively prevent dust and debris from entering.

[0015] The arc extinguishing assembly 2 includes multiple parallel arc extinguishing grid plates 21. A first air guide wall 5 is provided between the arc extinguishing assembly 2 and the first air outlet 3, and a second air guide wall 6 is provided between the arc extinguishing assembly 2 and the second air outlet 4. Both are located on one side of the arc extinguishing assembly 2, with the first air guide wall 5 located adjacent to the first air outlet 3 and the second air guide wall 6 located adjacent to the second air outlet 4. The end of the second air guide wall 6 near the second air outlet 4 is also provided with a bifurcated structure 61, which can make the guided airflow evenly dispersed when it approaches the second air outlet 4, avoid the airflow from concentrating and impacting the area around the air outlet, reduce local high pressure and sudden changes in airflow velocity, prevent the residue generated by arc combustion from being directly ejected from the circuit breaker by the high-speed airflow, and at the same time increase the contact area between the airflow and the arc extinguishing assembly 2 and the surrounding environment.

[0016] The housing 1 is also equipped with an operating mechanism 7, a stationary contact 8 and a moving contact 73. The operating mechanism 7 includes a handle 71 and a linkage component 72. The handle 71 is connected to the moving contact 73 through the linkage component 72, which can accurately control the opening and closing of the moving contact 73 and the stationary contact 8 to realize the opening and closing of the circuit.

[0017] In addition, the housing 1 is provided with an arc-blocking assembly 9, which consists of an arc-blocking iron sheet 91 and an arc-blocking plate 92. The arc-blocking plate 92 has a sliding groove 921. The opening and closing operations of the moving contact 73 and the stationary contact 8 are carried out in the area formed by the arc-blocking assembly 9. The arc-blocking iron sheet 91 can quickly conduct magnetism to concentrate the arc energy. The sliding groove 921 on the arc-blocking plate 92 can guide the arc to move along a specific path. The two work together to effectively limit the arc spread range, reduce damage to other components of the circuit breaker, and improve the safety and reliability of the circuit breaker.

[0018] Of course, in addition to the above embodiments, this utility model may have other various embodiments. Without departing from the essential technical solution of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, and these changes or modifications are equivalent to the technical solution in this patent. Therefore, these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.

Claims

1. An air outlet structure of a miniature circuit breaker, characterized by: The device includes a housing with an internal cavity. A first air outlet and a second air outlet are provided on the housing. An arc-extinguishing assembly is disposed within the internal cavity of the housing. The arc-extinguishing assembly comprises multiple parallel-arranged arc-extinguishing grids. A first air guide wall is provided between the arc-extinguishing assembly and the first air outlet, and a second air guide wall is provided between the arc-extinguishing assembly and the second air outlet. The housing also includes an operating mechanism, a stationary contact, and a moving contact. The operating mechanism includes a handle and a linkage component. The handle is connected to the moving contact via the linkage component and is used to control the opening and closing of the moving contact and the stationary contact.

2. The air outlet structure of a miniature circuit breaker according to claim 1, characterized by: The first air outlet is located in the upper region of the arc extinguishing component, and the second air outlet is located at the bottom of the housing and on one side of the arc extinguishing component. The first air guide wall and the second air guide wall are both located on one side of the arc extinguishing component. The first air guide wall is located adjacent to the first air outlet, and the second air guide wall is located adjacent to the second air outlet.

3. The air outlet structure of a miniature circuit breaker according to claim 1 or 2, characterized in that: The second air guide wall has a bifurcated structure at one end near the second air outlet.

4. The air outlet structure of a miniature circuit breaker according to claim 3, characterized in that: The openings of the second air outlet are arranged alternately in the horizontal direction, and the adjacent parts are staggered in height and do not touch each other in the vertical direction.

5. The air outlet structure of a miniature circuit breaker according to claim 1, characterized by: The housing is also provided with an arc-blocking assembly, which includes an arc-blocking iron sheet and an arc-blocking plate. The arc-blocking plate has a sliding groove, and the opening and closing operation of the moving contact and the stationary contact is carried out in the area formed by the arc-blocking assembly.

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