Circuit breaker

Abstract

The utility model discloses a circuit breaker, which relates to the technical field of electric appliances and comprises a shell, a wiring terminal assembly, a switch assembly, an arc extinguishing device and a current detection device, the wiring terminal assembly, the switch assembly, the arc extinguishing device and the current detection device are arranged in the shell, and the shell is provided with a containing cavity, a first opening and a second opening, the wiring terminal assembly comprises a first wiring terminal arranged at the first opening and a second wiring terminal arranged at the second opening, a main loop is formed between the first wiring terminal and the second wiring terminal, and the switch assembly comprises a moving contact and a static contact which are arranged on the main loop; the arc extinguishing device is arranged corresponding to the moving contact and the static contact, the current detection device is arranged on the side, close to the second opening, of the arc extinguishing device and comprises an installation base and a detection assembly arranged on the installation base, and an exhaust channel is defined by the installation base and the inner wall of the shell. One end of the exhaust channel faces the arc extinguishing device, and the other end of the exhaust channel is communicated with the second opening, and is used for exhausting plasma to improve the safety of the circuit breaker system.

Description

Technical Field

[0001] This utility model relates to the field of electrical technology, and in particular to a circuit breaker. Background Technology

[0002] Existing arc extinguishing technologies mainly rely on arc-extinguishing grids to divide the arc, medium cooling, and gas blowing to extinguish the arc. However, in this process, the high-temperature plasma generated by the ionization of air by the arc can cause multiple negative effects: First, the plasma temperature can reach thousands of degrees Celsius, causing carbonization of the internal insulation material of the arc extinguishing chamber and ablation of the metal contacts, reducing the service life of the equipment; Second, corrosive gases such as ozone (O3) and nitrogen oxides (NOx) generated by ionization can erode the structure of the arc extinguishing chamber and damage its sealing performance; Third, if the instantaneous high pressure formed by gas expansion cannot be released quickly, it may cause the shell to burst, threatening the safety of operators.

[0003] Currently, to alleviate gas pressure buildup during arc extinguishing, circuit breaker housings are generally equipped with independent vents or pressure relief channels. However, this design has efficiency drawbacks: on the one hand, vents typically employ a unidirectional or fixed-aperture structure, making it difficult to dynamically adjust the venting rate when arc energy fluctuates drastically, leading to delayed internal pressure release and exacerbating mechanical stress concentration; on the other hand, when plasma and free metal vapor are discharged with the airflow, they easily recondense into conductive particles near the vents, causing secondary pollution or external insulation degradation. Furthermore, the airflow path of traditional vents lacks coordinated optimization with the electric field distribution inside the arc extinguishing chamber, and the high-speed discharged ionized gas may interfere with the arc trajectory, reducing breaking efficiency. Utility Model Content

[0004] The main purpose of this invention is to propose a circuit breaker that aims to improve the low exhaust efficiency of existing circuit breakers.

[0005] To achieve the above objectives, the circuit breaker proposed in this utility model includes:

[0006] The housing has a receiving cavity and a first opening and a second opening communicating with the receiving cavity;

[0007] The terminal assembly includes a first terminal and a second terminal disposed within the receiving cavity. The first terminal is disposed at the first opening, and the second terminal is disposed at the second opening. A main circuit is formed between the first terminal and the second terminal.

[0008] A switching assembly includes a moving contact and a stationary contact disposed on the main circuit, the moving contact and the stationary contact being used to connect or disconnect the main circuit;

[0009] An arc-extinguishing device is disposed within the receiving cavity and located on the side of the moving contact and stationary contact away from the first terminal.

[0010] A current detection device is disposed within the receiving cavity and located on the side of the arc-extinguishing device near the second opening. The current detection device includes a mounting base and a detection component disposed on the mounting base. The detection component is used to detect the current flowing through the main circuit. An exhaust channel is formed between the mounting base and the inner wall of the housing. One end of the exhaust channel is disposed towards the arc-extinguishing device, and the other end of the exhaust channel is connected to the second opening.

[0011] In one embodiment, the first opening, the first terminal block, the arc extinguishing device, the current detection device, the second terminal block, and the second opening are arranged sequentially along a first direction, and the exhaust channel extends along the first direction.

[0012] In one embodiment, the mounting base is provided with the detection component on one side of the housing thickness direction, and the mounting base is provided with a guide groove on the side away from the detection component. The side of the mounting base with the guide groove abuts against and surrounds the inner wall of the housing to form the exhaust channel.

[0013] In one embodiment, a plurality of guide blocks are provided on the bottom wall of the guide groove protruding toward the inner wall of the housing, and the plurality of guide blocks are arranged in an alternating manner to make the exhaust channel bend and extend.

[0014] In one embodiment, the arc extinguishing device includes an arc extinguishing cover and an arc extinguishing grid plate disposed on the arc extinguishing cover. The arc extinguishing cover has a plurality of through holes on its side wall near the current detection device, and the plurality of through holes are connected to the exhaust channel.

[0015] In one embodiment, the housing is further provided with an exhaust port communicating with the receiving cavity. The exhaust port is spaced apart from the first opening and the second opening, and a plurality of through holes are communicating with the exhaust port.

[0016] In one embodiment, a partition is provided inside the housing. The partition is located between the current detection device and the arc extinguishing device and forms a first airflow channel and a second airflow channel. The exhaust channel communicates with a portion of the through holes through the first airflow channel, and the exhaust port communicates with another portion of the through holes through the second airflow channel.

[0017] In one embodiment, the second airflow channel is further provided with a plurality of guide plates, which are inclined toward the exhaust port.

[0018] In one embodiment, the terminal assembly further includes a first conductive element and a second conductive element. One end of the first conductive element is connected to the first terminal, and the other end of the first conductive element is disposed on one side of the arc extinguishing device. One end of the second conductive element is connected to the second terminal, and the other end of the second conductive element passes through the current detection device and is disposed on the arc extinguishing device on the opposite side of the first conductive element.

[0019] In one embodiment, the switch assembly further includes an operating mechanism, the moving contact is disposed on the operating mechanism and electrically connected to the first conductive element, the stationary contact is disposed at the end of the second conductive element away from the second terminal, and the moving contact and the stationary contact are arranged opposite to each other on the side of the arc extinguishing device away from the current detection device.

[0020] The technical solution of this utility model improves the venting efficiency of the circuit breaker by forming an exhaust channel through the cooperation of a current detection device and the housing. Specifically, the circuit breaker includes a housing and a terminal assembly, a switch assembly, an arc extinguishing device, and a current detection device disposed within the housing. The housing has a receiving cavity and a first opening and a second opening communicating with the receiving cavity. The terminal assembly includes a first terminal at the first opening and a second terminal at the second opening. The first terminal and the second terminal form a main circuit and are used to connect external cables respectively. The switch assembly includes a moving contact and a stationary contact disposed on the main circuit. The arc extinguishing device is disposed within the housing and is located on the side of the moving contact and the stationary contact away from the first terminal. The current detection device is disposed on the side of the arc extinguishing device close to the second opening. The current detection device includes a mounting base and a detection component disposed on the mounting base. The detection component is used to detect the current flowing through the main circuit. The mounting base and the inner wall of the housing enclose a venting channel. One end of the venting channel faces the arc extinguishing device and the other end communicates with the second opening.

[0021] When the moving contact and the stationary contact separate, an electric arc is generated. The electric arc excites the air to generate plasma. The arc extinguishing device extinguishes the electric arc, and the generated plasma can be discharged from the casing through the exhaust channel from the second opening. This prevents equipment damage and arc reignition caused by untimely discharge of ionized gas, thereby improving the safety of the circuit breaker system. Attached Figure Description

[0022] 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, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the structure of an embodiment of the circuit breaker provided by this utility model;

[0024] Figure 2 for Figure 1 A cross-sectional view along the AA direction;

[0025] Figure 3 A schematic diagram of the internal structure of the housing in one embodiment of the circuit breaker provided by this utility model;

[0026] Figure 4 A schematic diagram of the current detection component in one embodiment of the circuit breaker provided by this utility model;

[0027] Figure 5 Another structural schematic diagram of the current detection component of an embodiment of the circuit breaker provided by this utility model;

[0028] Figure 6 A schematic diagram of the housing structure in one embodiment of the circuit breaker provided by this utility model;

[0029] Figure 7 A schematic diagram showing the disassembled structure of an embodiment of the circuit breaker provided by this utility model;

[0030] Figure 8 This is a schematic diagram of the assembly structure of the components in one embodiment of the circuit breaker provided by this utility model.

[0031] Explanation of icon numbers:

[0032] 100. Circuit breaker; 1. Housing; 1a. Receiving cavity; 1b. First opening; 1c. Second opening; 1d. Exhaust port; 11. Partition; 11a. First airflow channel; 11b. Second airflow channel; 12. Guide plate; 2. Terminal assembly; 21. First terminal; 22. Second terminal; 23. First conductive element; 24. Second conductive element; 3. Arc extinguishing device; 31. Arc extinguishing cover; 31a. Through hole; 32. Arc extinguishing grid; 4. Current detection device; 4a. Exhaust channel; 41. Mounting base; 41a. Guide groove; 411. Guide block; 42. Detection assembly; 421. Shielding element; 422. Magnetic sensor; 5. Switch assembly; 51. Moving contact; 52. Stationary contact; 53. Operating mechanism; 6. Main control board; 7. Tripping mechanism.

[0033] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] 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 of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0035] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0036] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0037] This utility model proposes a circuit breaker 100.

[0038] Please see Figures 1 to 4 The circuit breaker 100 includes a housing 1 and a terminal assembly 2, an arc-extinguishing device 3, and a current detection device 4 disposed within the housing 1. The housing 1 has a receiving cavity 1a and a first opening 1b and a second opening 1c communicating with the receiving cavity 1a. The terminal assembly 2 includes a first terminal 21 disposed at the first opening 1b and a second terminal 22 disposed at the second opening 1c. The first terminal 21 and the second terminal 22 form a main circuit and are used to connect external cables respectively. Further reference... Figure 8The switch assembly 5 includes a moving contact 51 and a stationary contact 52 disposed on the main circuit; the arc extinguishing device 3 is disposed on the side of the moving contact 51 and the stationary contact 52 away from the first terminal 21; the current detection device 4 is disposed on the side of the arc extinguishing device 3 near the second opening 1c. The current detection device 4 includes a mounting base 41 and a detection component 42 disposed on the mounting base 41. The detection component 42 is used to detect the current flowing through the main circuit. The mounting base 41 and the inner wall of the housing 1 form an exhaust channel 4a. One end of the exhaust channel 4a is disposed towards the arc extinguishing device 3 and the other end is connected to the second opening 1c.

[0039] When the moving contact 51 and the stationary contact 52 are in contact, the main circuit is connected. When the moving contact 51 and the stationary contact 52 are disconnected, an electric arc is generated. The air is broken down by the electric field and plasma is generated. The arc extinguishing device 3 guides the arc to move along a predetermined path to extinguish it quickly. The generated plasma can be discharged from the casing 1 through the exhaust channel 4a from the second opening 1c, preventing the arc from reigniting and equipment damage caused by the untimely discharge of ionized gas, thereby improving the safety of the circuit breaker 100 system.

[0040] It should be noted that the detection device is used to detect the current in the main circuit. When the current exceeds the set range, the detection component 42 can trigger the circuit breaker 100 to cut off the circuit to protect the equipment. The detection component 42 includes, but is not limited to, current transformers, intelligent current sensors, overload relays, electromagnetic induction devices, etc. It is mainly used to monitor current changes and ensure that the current does not exceed the set safety range. The detection component 42 can be one or more of these, and no specific limitation is made here.

[0041] In one embodiment, the first opening 1b, the first terminal 21, the arc extinguishing device 3, the current detection device 4, the second terminal 22, and the second opening 1c are arranged sequentially along the first direction, and the exhaust channel 4a extends along the first direction.

[0042] like Figure 3 As shown, in one embodiment of this utility model, the first opening 1b and the second opening 1c are located on opposite sides of the housing 1. The first terminal 21, the arc extinguishing device 3, the current detection device 4, and the second terminal 22 are sequentially arranged in the receiving cavity 1a, so that the first opening 1b, the first terminal 21, the arc extinguishing device 3, the current detection device 4, the second terminal 22, and the second opening 1c are arranged along a first direction, which is the width direction of the housing 1. The moving contact 51 and the stationary contact 52 are located on the side of the arc extinguishing device 3 near the first terminal 21. The arc extinguishing device 3 is used to guide and extinguish the electric arc. The exhaust channel 4a extends along the first direction, and the plasma generated by the electric arc can be discharged from the housing 1 along the first direction from the exhaust channel 4a and the second opening 1c.

[0043] It is understandable that arranging multiple components in the housing 1 along the first direction can effectively save space, reduce the vertical height occupied by the equipment, and the horizontal arrangement helps air circulation, improves heat dissipation efficiency, avoids local overheating or accumulation of ionized gas, ensures that the circuit breaker 100 maintains a stable temperature during operation, and extends the service life of the equipment.

[0044] In one embodiment, a detection component 42 is provided on one side of the housing 1 in the thickness direction of the mounting base 41, and a guide groove 41a is provided on the side of the mounting base 41 away from the detection component 42. The side of the mounting base 41 with the guide groove 41a abuts against and surrounds the inner wall of the housing 1 to form an exhaust channel 4a.

[0045] like Figure 3 and Figure 4 As shown, in one embodiment of this utility model, the housing 1 includes two sub-housings. The engagement direction of the two sub-housings is the thickness direction of the housing 1. A detection component 42 is disposed on the side of the mounting base 41 facing one of the sub-housings. A guide groove 41a is recessed on the side of the mounting base 41 facing the other sub-housing. The side of the mounting base 41 away from the detection component 42 abuts against the inner wall of the housing 1 so that the guide groove 41a is enclosed to form an exhaust channel 4a. It can be understood that using the existing current detection device 4 to set the guide groove 41a can save space and improve the plasma exhaust efficiency, which is beneficial to reducing the manufacturing cost of the circuit breaker 100.

[0046] In one embodiment, a plurality of guide blocks 411 are provided on the bottom wall of the guide groove 41a protruding toward the inner wall of the housing 1, and the plurality of guide blocks 411 are arranged in an alternating manner to make the exhaust channel 4a bend and extend.

[0047] like Figure 4 As shown, in one embodiment of this utility model, a plurality of guide blocks 411 are provided on the bottom wall of the flow guide trough 41a. The guide blocks 411 protrude from the bottom wall of the flow guide trough 41a toward the opening of the flow guide trough 41a and abut against the inner wall of the housing 1. The plurality of guide blocks 411 are distributed at intervals on both sides of the flow guide trough 41a along a first direction. One end of some guide blocks 411 is connected to the side wall of the flow guide trough 41a, and the other end extends obliquely and forms an angle with the first direction, so that the exhaust channel 4a extends in a curved manner. It can be understood that the curved exhaust channel 4a helps to change the direction of plasma flow, increase the contact time between plasma and cooling medium (air), thereby effectively helping to cool the plasma and make it more smoothly and controllably discharged outside the housing 1, avoiding damage to the internal components of the circuit breaker 100 by the plasma.

[0048] In one embodiment, the arc extinguishing device 3 includes an arc extinguishing cover 31 and an arc extinguishing grid 32 disposed on the arc extinguishing cover 31. The arc extinguishing cover 31 has a plurality of through holes 31a on its side wall near the current detection device 4, and the plurality of through holes 31a are connected to the exhaust channel 4a.

[0049] like Figure 3 and Figure 7 As shown, in one embodiment of this utility model, the arc-extinguishing device 3 includes an arc-extinguishing cover 31 and arc-extinguishing grid plates 32. Specifically, the arc-extinguishing cover 31 is open on the side facing the first terminal 21, and a plurality of arc-extinguishing grid plates 32 are arranged at intervals on the arc-extinguishing cover 31 along the second direction (i.e., the height direction of the circuit breaker 100). (Refer to reference...) Figure 8 The moving contact 51 and the stationary contact 52 are located on the side of the arc-extinguishing cover 31 away from the current detection device 4. Multiple through holes 31a are provided on the side wall of the arc-extinguishing cover 31 away from the moving contact 51 and the stationary contact 52. The arc-extinguishing grid 32 is used to guide and extinguish the arc generated when the moving contact 51 and the stationary contact 52 separate. The plasma generated by the arc enters the exhaust channel 4a through the through holes 31a of the arc-extinguishing cover 31 and finally exits to the outside of the housing 1 through the second opening 1c. The multiple through holes 31a are used to allow plasma to flow and prevent plasma from accumulating inside the housing 1.

[0050] In one embodiment, the housing 1 is further provided with an exhaust port 1d that communicates with the receiving cavity 1a. The exhaust port 1d is spaced apart from the first opening 1b and the second opening 1c, and a plurality of through holes 31a communicate with the exhaust port 1d.

[0051] like Figure 6 and Figure 7 As shown, in one embodiment of this utility model, the housing 1 is also provided with an exhaust port 1d. Specifically, the exhaust port 1d is connected to the receiving cavity 1a and is spaced apart from the first opening 1b and the second opening 1c. The multiple through holes 31a of the arc extinguishing cover 31 are connected to the exhaust port 1d, so that the plasma generated by the arc extinguishing device 3 can be discharged from the housing 1 from the exhaust channel 4a and the second opening 1c, or from the exhaust port 1d, thereby further improving the plasma discharge efficiency and enhancing the safety of the equipment.

[0052] It should be noted that the exhaust port 1d can be located at the bottom of the housing 1 near the arc extinguishing device 3 in order to shorten the flow time of the plasma in the housing 1 and reduce the internal temperature of the circuit breaker 100. Its location can be set according to the actual situation and is not limited in any specific way.

[0053] In one embodiment, a partition 11 is provided inside the housing 1. The partition 11 is located between the current detection device 4 and the arc extinguishing device 3 and forms a first airflow channel 11a and a second airflow channel 11b. The exhaust channel 4a is connected to a portion of the through hole 31a through the first airflow channel 11a, and the exhaust port 1d is connected to another portion of the through hole 31a through the second airflow channel 11b.

[0054] like Figure 3 and Figure 7 As shown, in one embodiment of this utility model, a partition 11 is further provided inside the housing 1. The partition 11 is located between the current detection device 4 and the arc extinguishing device 3, separating a first airflow channel 11a and a second airflow channel 11b. The exhaust channel 4a is connected to the first airflow channel 11a, and the exhaust port 1d is connected to the second airflow channel 11b, so that the through hole 31a in the upper half of the arc extinguishing cover 31 is connected to the first airflow channel 11a and the exhaust channel 4a, and the through hole 31a in the lower half of the arc extinguishing cover 31 is connected to the second airflow channel 11b and the exhaust port 1d. It can be understood that by discharging plasma through dual channels, the plasma can come into more effective contact with the air, accelerating the plasma cooling process, reducing heat accumulation inside the equipment, and avoiding the design limitations of a single channel. By rationally planning multiple exhaust paths, the spatial layout of the equipment can be optimized to reduce its volume.

[0055] In one embodiment, a plurality of guide plates 12 are also provided in the second airflow channel 11b, and the guide plates 12 are inclined toward the exhaust port 1d.

[0056] like Figure 6 and Figure 7 As shown, in one embodiment of this utility model, a plurality of guide plates 12 are further provided on the housing 1 within the second airflow channel 11b. Specifically, the plurality of guide plates 12 are arranged at intervals along the second direction on the inner wall of the housing 1, and the guide plates 12 are located at the edge of the through hole 31a and inclined towards the exhaust port 1d. After the plasma is discharged from the through hole 31a, it flows towards the exhaust port 1d under the guidance of the guide plates 12. It can be understood that the guide plates 12 can precisely control the flow path of the plasma, making it easier to be discharged quickly, reducing its residence time inside the circuit breaker 100, thereby causing the plasma around the arc to disperse rapidly, which is beneficial to the cooling and disappearance of the arc and reduces the possibility of arc recovery.

[0057] In one embodiment, the terminal assembly 2 further includes a first conductive element 23 and a second conductive element 24. One end of the first conductive element 23 is connected to the first terminal 21, and the other end of the first conductive element 23 is disposed on one side of the arc extinguishing device 3. One end of the second conductive element 24 is connected to the second terminal 22, and the other end of the second conductive element 24 passes through the current detection device 4 and is disposed on the arc extinguishing device 3 on the opposite side of the first conductive element 23.

[0058] like Figure 8 As shown, in one embodiment of this utility model, the terminal assembly 2 further includes a first conductive element 23 and a second conductive element 24. One end of the first conductive element 23 is electrically connected to the first terminal 21, and the other end extends to the bottom of the arc extinguishing device 3. One end of the second conductive element 24 is electrically connected to the second terminal 22, and the other end passes through the current detection device 4 and extends to the top of the arc extinguishing device 3. The stationary contact 52 is located at the end of the second conductive element 24 away from the second terminal 22. The moving contact 51 is connected to the first conductive element 23 so that when the moving contact 51 abuts against the stationary contact 52, the circuit between the first terminal 21 and the second terminal 22 is connected.

[0059] Further reference Figure 2 and Figure 5 The current detection device 4 includes a magnetic sensor 422 and a shield 421 mounted on a mounting base 41. The shield 421 has a shielding space that is open to one side. A second conductive element 24 passes through the shielding space. The magnetic sensor 422 is located within the shielding space and is positioned on the side of the second conductive element 24 closest to the open side of the shield 421. (Refer to reference...) Figure 2 and Figure 7 The circuit breaker 100 also includes a main control board 6, which is located on the side of the mounting base 41 away from the guide groove 41a. The magnetic sensor 422 is electrically connected to the main control board 6. The magnetic sensor 422 is used to detect the magnetic field strength in the shielded space and send the detection information to the main control board 6 to obtain the magnitude of the current flowing through the second conductive element 24.

[0060] In one embodiment, the switch assembly 5 further includes an operating mechanism 53, a moving contact 51 disposed on the operating mechanism 53 and electrically connected to the first conductive element 23, and a stationary contact 52 disposed at the end of the second conductive element 24 away from the second terminal 22. The moving contact 51 and the stationary contact 52 are arranged opposite to each other on the side of the arc extinguishing device 3 away from the current detection device 4.

[0061] like Figure 8 As shown, in one embodiment of this utility model, the switch assembly 5 further includes an operating mechanism 53. Specifically, the operating mechanism 53 includes a handle and a transmission assembly connected to the handle. The moving contact 51 is disposed on the transmission assembly. When the handle is rotated under the action of external force, the moving contact 51 can be driven to move closer to or away from the stationary contact 52 through the transmission assembly. The moving contact 51 is connected to the first conductive element 23 through a welded wire. The stationary contact 52 and the moving contact 51 are arranged opposite to each other and are located on the side of the arc extinguishing device 3 away from the current detection device 4. When the stationary contact 52 and the moving contact 51 are separated, the electric arc generated is extinguished by the arc extinguishing device 3.

[0062] Furthermore, the circuit breaker 100 also includes a tripping mechanism 7 located above the arc extinguishing device 3. The second conductive element 24 is partially wound around the tripping mechanism 7. When the current in the main circuit is too large, the magnetic field generated by the current in the second conductive element 24 drives the tripping mechanism 7 to push the operating mechanism 53, so that the moving contact 51 and the stationary contact 52 are separated to achieve circuit breaking and ensure the safety of the equipment line.

[0063] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A circuit breaker, characterized in that, include: The housing has a receiving cavity and a first opening and a second opening communicating with the receiving cavity; The terminal assembly includes a first terminal and a second terminal disposed within the receiving cavity. The first terminal is disposed at the first opening, and the second terminal is disposed at the second opening. A main circuit is formed between the first terminal and the second terminal. A switching assembly includes a moving contact and a stationary contact disposed on the main circuit, the moving contact and the stationary contact being used to connect or disconnect the main circuit; An arc-extinguishing device is disposed within the receiving cavity and located on the side of the moving contact and stationary contact away from the first terminal. A current detection device is disposed within the receiving cavity and located on the side of the arc-extinguishing device near the second opening. The current detection device includes a mounting base and a detection component disposed on the mounting base. The detection component is used to detect the current flowing through the main circuit. An exhaust channel is formed between the mounting base and the inner wall of the housing. One end of the exhaust channel is disposed towards the arc-extinguishing device, and the other end of the exhaust channel is connected to the second opening.

2. The circuit breaker as described in claim 1, characterized in that, The first opening, the first terminal block, the arc extinguishing device, the current detection device, the second terminal block, and the second opening are arranged sequentially along the first direction, and the exhaust channel extends along the first direction.

3. The circuit breaker as described in claim 2, characterized in that, The mounting base is provided with the detection component on one side of the housing thickness direction, and the mounting base is provided with a guide groove on the side away from the detection component. The side of the mounting base with the guide groove abuts against and surrounds the inner wall of the housing to form the exhaust channel.

4. The circuit breaker as described in claim 3, characterized in that, The bottom wall of the guide channel has multiple guide blocks protruding towards the inner wall of the housing, and the multiple guide blocks are arranged in an alternating manner to make the exhaust channel bend and extend.

5. The circuit breaker as described in any one of claims 1 to 4, characterized in that, The arc extinguishing device includes an arc extinguishing cover and an arc extinguishing grid plate disposed on the arc extinguishing cover. The arc extinguishing cover has multiple through holes on its side wall near the current detection device, and the multiple through holes are connected to the exhaust channel.

6. The circuit breaker as described in claim 5, characterized in that, The housing is also provided with an exhaust port that communicates with the receiving cavity. The exhaust port is spaced apart from the first opening and the second opening, and a plurality of through holes communicate with the exhaust port.

7. The circuit breaker as described in claim 6, characterized in that, A partition is provided inside the housing. The partition is located between the current detection device and the arc extinguishing device and forms a first airflow channel and a second airflow channel. The exhaust channel communicates with a portion of the through holes through the first airflow channel, and the exhaust port communicates with another portion of the through holes through the second airflow channel.

8. The circuit breaker as claimed in claim 7, characterized in that, The second airflow channel is also provided with multiple guide plates, which are inclined toward the exhaust port.

9. The circuit breaker as claimed in claim 1, characterized in that, The terminal assembly further includes a first conductive element and a second conductive element. One end of the first conductive element is connected to the first terminal, and the other end of the first conductive element is disposed on one side of the arc extinguishing device. One end of the second conductive element is connected to the second terminal, and the other end of the second conductive element passes through the current detection device and is disposed on the arc extinguishing device on the opposite side of the first conductive element.

10. The circuit breaker as claimed in claim 9, characterized in that, The switch assembly further includes an operating mechanism, the moving contact is disposed on the operating mechanism and electrically connected to the first conductive element, the stationary contact is disposed at the end of the second conductive element away from the second terminal, and the moving contact and the stationary contact are arranged opposite to each other on the side of the arc extinguishing device away from the current detection device.

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