Circuit breaker

Abstract

A circuit breaker comprises a shell, a moving contact, a static contact, an operating mechanism, an arc extinguish chamber, a first wiring terminal and a second wiring terminal, the moving contact, the static contact, the operating mechanism, the arc extinguish chamber, the first wiring terminal and the second wiring terminal are respectively arranged in the shell, the first wiring terminal and the second wiring terminal are respectively connected with the static contact and the moving contact, and the operating mechanism is used for driving the moving contact and the static contact to be contacted and separated. The shell is provided with an exhaust hole, an exhaust channel communicated between the exhaust hole and the arc extinguish chamber is arranged in the shell, the baffle can move between a first position and a second position, the elastic piece is used for driving the baffle to move to the first position, and the limiting structure is used for limiting the baffle to move to the second position. Arc extinguishing gas exhausted by the arc extinguishing chamber can drive the baffle to move towards a second position far away from the limiting structure to open the exhaust channel, so that the arc extinguishing gas is exhausted from the exhaust hole through the exhaust channel, dust, foreign matters, water vapor and the like cannot enter the shell any more, and normal contact of the moving contact and the static contact is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of low voltage apparatus, concretely relates to a circuit breaker. BACKGROUND

[0002] Miniature circuit breaker is very important for electric safety, in order to ensure that it plays a protective role in the use process, can reliably break the current when the circuit overload or short circuit fault occurs, protects the electric appliance and household electric safety, should fully consider the influence of design, manufacture, assembly, use environment and so on to miniature circuit breaker. From the current return analysis situation, the failure of miniature circuit breaker is largely related to the use habit of user, such as exposing miniature circuit breaker in the environment full of dust, oil fume, humidity, dust and foreign matter will enter, even more, in the outdoor electric cabinet, ants, spiders, mosquitoes and so on will enter the inside of miniature circuit breaker, lead to the phenomenon of not power in the use process of miniature circuit breaker, the proportion in return analysis is 10-20%.

[0003] According to the analysis, foreign matter mainly enters through the exhaust hole arranged at the bottom of the circuit breaker, although the exhaust hole plays an important role in discharging high-temperature gas during the breaking process of the miniature circuit breaker, but it inevitably leads to the entry of dust, foreign matter and water vapor into the miniature circuit breaker, resulting in the performance degradation and even failure of the circuit breaker. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at overcoming at least one defect of the prior art, and provides a circuit breaker.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A circuit breaker, comprising a housing and a movable contact, a static contact, an operating mechanism, an arc extinguishing chamber, a first wiring terminal and a second wiring terminal arranged in the housing respectively, the first wiring terminal and the second wiring terminal are connected with the static contact and the movable contact respectively, the operating mechanism is used for driving the movable contact to contact and separate from the static contact, the housing is provided with an exhaust hole, the housing is internally provided with an exhaust passage communicated between the exhaust hole and the arc extinguishing chamber, and further comprises a baffle, an elastic member and a limiting structure, the baffle can move between a first position and a second position, the elastic member is used for driving the baffle to move to the first position, so that the baffle contacts the limiting structure and blocks the exhaust passage, the arc extinguishing gas discharged from the arc extinguishing chamber can drive the baffle to move to the second position away from the limiting structure to open the exhaust passage, so that the arc extinguishing gas is discharged from the exhaust hole through the exhaust passage.

[0007] Preferably, the arc-extinguishing chamber is provided with a baffle plate on the side close to the exhaust passage, the end of the baffle plate away from the arc-extinguishing chamber is arranged adjacent to the exhaust passage, and the end of the baffle plate close to the arc-extinguishing chamber is arranged away from the exhaust passage, so as to guide the arc-extinguishing gas to the exhaust passage.

[0008] Preferably, the arc-extinguishing chamber is further provided with a second baffle plate on the side close to the exhaust passage, the end of the second baffle plate away from the arc-extinguishing chamber is connected to the end of the baffle plate away from the exhaust passage, and the end of the second baffle plate close to the arc-extinguishing chamber is located on the side of the baffle plate away from the exhaust passage, so that the baffle plate divides the arc-extinguishing gas into two parts, one part of the arc-extinguishing gas is guided to the exhaust passage through the baffle plate, and the other part of the arc-extinguishing gas is guided to the side of the arc-extinguishing chamber away from the exhaust passage through the second baffle plate, and then returns to the arc-extinguishing chamber through the space between the moving contact and the static contact.

[0009] Preferably, the side of the arc-extinguishing chamber away from the exhaust passage is provided with a short-circuit tripping device, the arc-extinguishing gas is guided to the short-circuit tripping device through the second baffle plate first, and then returns to the arc-extinguishing chamber through the space between the moving contact and the static contact.

[0010] Preferably, the end of the baffle plate close to the arc-extinguishing chamber is arranged at the middle of the second baffle plate and on the side of the middle of the second baffle plate close to the arc-extinguishing chamber.

[0011] Preferably, the baffle plate is in an arc shape, the baffle plate comprises a first curved portion curved away from the arc-extinguishing chamber and a second curved portion curved close to the arc-extinguishing chamber, and the second curved portion is located on the side of the first curved portion away from the arc-extinguishing chamber.

[0012] Preferably, the baffle plate is in a flat shape, and the baffle plate is arranged tangentially to the second curved portion.

[0013] Preferably, the baffle plate is arranged to slide linearly in the shell, or the baffle plate is arranged to rotate in the shell.

[0014] Preferably, the shell is further provided with a guide rod connected to the baffle plate, the shell is provided with a guide column, the guide column is provided with a guide groove for inserting the guide rod, and the baffle plate drives the guide rod to slide along the guide groove when the baffle plate moves between the first position and the second position.

[0015] Preferably, the elastic member is sleeved on the outside of the guide column, and the two ends of the elastic member are in contact with the baffle plate and the shell, respectively.

[0016] Preferably, the baffle plate is arranged to be inclined relative to the guide rod.

[0017] Preferably, the guide column is arranged in parallel with the length direction of the circuit breaker, and the guide rod is driven to move along the length direction of the circuit breaker when the baffle moves between the first position and the second position, and the side wall of the exhaust passage away from the exhaust hole along the length direction of the circuit breaker forms the limiting structure, and the side wall of the exhaust passage away from the exhaust hole along the height direction of the circuit breaker is in contact with the baffle.

[0018] Preferably, the exhaust hole is arranged in parallel with the height direction of the circuit breaker.

[0019] Preferably, the bottom of the shell is provided with a first mounting structure and a second mounting structure, and a mounting groove is arranged between the first mounting structure and the second mounting structure, a sliding groove is arranged in the first mounting structure, a limiting member is arranged in the sliding groove and can move along the length direction of the circuit breaker, a transverse plate is arranged between the sliding groove and the exhaust passage, and the exhaust hole is arranged on the transverse plate and communicates between the exhaust passage and the mounting groove.

[0020] Preferably, the circuit breaker is a miniature circuit breaker, the shell is in the shape of a Chinese character "K", a convex structure is arranged in the middle of the shell and protrudes along the height direction of the circuit breaker, the convex structure is used for accommodating a handle, at least part of an operating mechanism and at least part of a short-circuit release, first and second wiring grooves are arranged at two ends of the shell along the length direction of the circuit breaker, the first and second wiring grooves are respectively used for accommodating first and second wiring terminals, a static contact and a dynamic contact are arranged between an arc extinguishing chamber and the second wiring terminal, an overload release is arranged between the second wiring terminal and the dynamic contact, and the short-circuit release is arranged between the arc extinguishing chamber and the handle and is connected between the first wiring terminal and the static contact.

[0021] Preferably, one side of the first wiring groove along the height direction of the circuit breaker is provided with a first mounting structure, the exhaust passage is arranged between the first wiring groove and the first mounting structure, one side of the second wiring groove along the height direction of the circuit breaker is provided with a second mounting structure, and a mounting groove is arranged between the first mounting structure and the second mounting structure.

[0022] Preferably, the exhaust hole is in the shape of a strip, and the length direction of the exhaust hole is arranged in parallel with the width direction of the circuit breaker.

[0023] The circuit breaker of the utility model, by the baffle blocks up the exhaust passage, makes the gas flow in the single direction, and cannot flow reversely, makes the dust, foreign matter and water vapor etc. can no longer enter the shell, guarantees the normal contact of the dynamic contact and the static contact, when the contact separates, the baffle is blown open by the gas in the arc extinguishing chamber, makes the electric arc discharge from the arc discharge port, guarantees the normal breaking of the miniature circuit breaker, after the arc discharge ends, under the action of the elastic force, the baffle resets and again resists the arc inlet port.

[0024] In addition, the partition plate can guide the gas to the baffle position, play a role in concentrating the gas flow, facilitate the movement of the baffle to the second position, and also change the direction to improve the spring force, thereby improving the sealing protection effect.

[0025] In addition, the exhaust hole is arranged on the horizontal plate and is communicated between the exhaust channel and the mounting groove, the opening of the exhaust hole is directed to the bottom of the circuit breaker, the gas can be discharged in the length direction of the circuit breaker, and the influence on the adjacent circuit breaker is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic diagram of the circuit breaker of the utility model;

[0027] Figure 2 is a structural schematic diagram of the first embodiment of the utility model;

[0028] Figure 3 is a structural schematic diagram of the second embodiment of the utility model;

[0029] Figure 4 is a structural schematic diagram of the second embodiment of the utility model when the baffle is opened;

[0030] Figure 5 is a structural schematic diagram of the shell of the second embodiment of the utility model;

[0031] Figure 6 is a structural schematic diagram of the baffle of the second embodiment of the utility model;

[0032] Figure 7 is a structural schematic diagram of the baffle and the guide rod of the utility model;

[0033] Figure 8 is a structural schematic diagram of the bottom of the shell of the utility model;

[0034] In the drawings:

[0035] 1 shell 18 second wiring terminal

[0036] 2 exhaust hole 19 handle

[0037] 3 exhaust channel 71 first curved portion

[0038] 4 baffle 72 second curved portion

[0039] 5 spring 73 second partition plate

[0040] 6 limit structure 81 guide rod

[0041] 7 partition plate 91 first mounting structure

[0042] 11 movable contact 82 guide column

[0043] 12 stationary contact 92 second mounting structure

[0044] 13 operating mechanism 93 mounting slot

[0045] 14 overload release 94 sliding slot

[0046] 15 short-circuit release 95 cross plate

[0047] 16 arc-extinguishing chamber 171 first wiring slot

[0048] 17 first wiring terminal DETAILED DESCRIPTION

[0049] The specific embodiments of the circuit breaker of the present application are further illustrated in the following examples in conjunction with the accompanying drawings. The circuit breaker of the present application is not limited to the description of the following examples.

[0050] As shown in Figure 1 , the circuit breaker of the present embodiment comprises a housing 1 and a moving contact 11, a stationary contact 12, an operating mechanism 13, an overload release 14, a short-circuit release 15, an arc-extinguishing chamber 16, a first wiring terminal 17 and a second wiring terminal 18 arranged in the housing 1 respectively, the first wiring terminal 17 and the second wiring terminal 18 are connected to the line respectively, the first wiring terminal 17 and the second wiring terminal 18 are connected to the stationary contact 12 and the moving contact 11 respectively, in the present embodiment, the first wiring terminal 17 is connected to the stationary contact 12 through the short-circuit release 15, the second wiring terminal 18 is connected to the moving contact 11 through the overload release 14, the operating mechanism 13 is connected to a handle 19, the operating mechanism 13 is used to drive the moving contact 11 to contact and separate from the stationary contact 12, thereby turning on and off the line, the short-circuit release 15 triggers the operating mechanism 13 to release when the short-circuit current passes, so that the operating mechanism 13 drives the moving contact 11 to separate from the stationary contact 12, realizing the short-circuit protection function, the overload release 14 triggers the operating mechanism 13 to release when the overload current passes, so that the operating mechanism 13 drives the moving contact 11 to separate from the stationary contact 12, realizing the overload protection function.

[0051] As shown in Figure 2 , an improvement point of the present embodiment is that the housing 1 is provided with an exhaust hole 2, the housing 1 is internally provided with an exhaust passage 3 communicating between the exhaust hole 2 and the arc-extinguishing chamber 16, further comprising a baffle 4, an elastic member 5 and a limiting structure 6, the elastic member 5 is used to drive the baffle 4 to move to a first position, so that the baffle 4 contacts the limiting structure 6 and blocks the exhaust passage 3, the arc-extinguishing gas discharged from the arc-extinguishing chamber 16 can drive the baffle 4 to move to a second position away from the limiting structure 6 to open the exhaust passage 3, so that the arc-extinguishing gas is discharged from the exhaust hole 2 through the exhaust passage 3.

[0052] As shown in Figures 2-3As shown, the limiting structure is located on the side of the baffle 4 away from the exhaust hole 2, and the limiting structure 6 is used to block the baffle 4, so that the baffle 4 cannot move away from the second position when it bears the external force on the side of the exhaust hole, and the baffle 4 can move towards the second position when it bears the external force on the side of the arc extinguishing chamber 16. The gas in the arc extinguishing chamber 16 is discharged from the exhaust hole 2 after passing through the exhaust passage 3.

[0053] The circuit breaker of the embodiment blocks the exhaust passage 3 with the baffle 4 ( Figure 3 ), so that the gas flows in a single direction and cannot flow in the opposite direction, and dust, foreign matter and water vapor cannot enter the housing 1, ensuring the normal contact of the moving and static contacts 12. When the contacts are separated ( Figure 4 ), the baffle 4 is blown open by the gas in the arc extinguishing chamber 16, so that the arc is discharged from the arc discharge port, ensuring the normal breaking of the small circuit breaker. After the arc discharge is completed, the baffle 4 is reset under the action of the elastic member 5 and again abuts against the arc inlet port.

[0054] As shown in the drawings, Figure 3 the housing 1 is provided with a first wiring slot 171 for accommodating a first wiring terminal 17. The first wiring slot 171 and the exhaust passage 3 are both arranged on the side of the arc extinguishing chamber 16 away from the static contact 12, and the exhaust passage 3 is arranged on the side of the first wiring slot 171 along the height direction of the circuit breaker.

[0055] Further, as shown in the drawings, Figure 2 the side of the arc extinguishing chamber 16 close to the exhaust passage 3 is provided with a partition plate 7. The end of the partition plate 7 away from the arc extinguishing chamber 16 is arranged adjacent to the exhaust passage 3, and the end of the partition plate 7 close to the arc extinguishing chamber 16 is arranged spaced apart from the exhaust passage 3, for guiding the arc extinguishing gas to the exhaust passage 3. The partition plate 7 can guide the gas to the position of the baffle 4, so as to concentrate the airflow, facilitate the movement of the baffle 4 to the second position, and also change the direction to increase the elastic force of the elastic member 5, thereby improving the sealing and protection effect.

[0056] Further, the side of the arc extinguishing chamber 16 close to the exhaust passage 3 is also provided with a second partition plate 73. The end of the second partition plate 73 away from the arc extinguishing chamber 16 is connected to the end of the partition plate 7 away from the arc extinguishing chamber 16, and the end of the second partition plate 73 close to the arc extinguishing chamber 16 is located on the side of the partition plate 7 away from the exhaust passage 3. The partition plate 7 is used to divide the arc extinguishing gas into two parts. One part of the arc extinguishing gas is guided to the exhaust passage 3 through the partition plate 7, and the other part of the arc extinguishing gas moves along the path indicated by the arrow in the drawings. Figure 4 The side of the partition plate 7 away from the exhaust passage 3 is provided with a short-circuit release 15. The arc extinguishing gas is first guided to the side of the arc extinguishing chamber 16 away from the exhaust passage 3 through the second partition plate 73, then passes through the space between the moving contact 11 and the static contact 12 to return to the arc extinguishing chamber 16, and finally is guided to the exhaust passage 3 through the partition plate 7 to be discharged.

[0057] Preferably, the arc-extinguishing chamber 16 is provided with a short-circuit tripping device 15 on the side away from the exhaust channel 3, the short-circuit tripping device 15 has a magnetic yoke and a coil former, which can play a role in guiding the airflow, and the operating mechanism 13 can guide the airflow passing through the short-circuit tripping device 15 to the space between the moving contact 11 and the static contact 12.

[0058] The arc-extinguishing gas first passes through the second partition plate 73 to the short-circuit tripping device 15, and then passes through the space between the moving contact 11 and the static contact 12 to return to the arc-extinguishing chamber 16, and the partition plate 7 is arranged at the middle part of the second partition plate 73 corresponding to the end of the arc-extinguishing chamber 6, and is located on the side of the second partition plate 73 close to the arc-extinguishing chamber 16. By cooperating the partition plate 7 and the second partition plate 73, the exhaust gas of the arc-extinguishing chamber 16 is divided into two parts, which can avoid the interference between the upper gas and the lower gas, and ensure the smooth exhaust of the gas.

[0059] Preferably, the partition plate 7 is located at the middle part of the height of the arc-extinguishing chamber 16, and is basically at the position of 1 / 2 of the height of the arc-extinguishing chamber 16, which can guide half of the gas in the arc-extinguishing chamber 16 to the exhaust channel 3.

[0060] As shown in Figure 5 , 6 , the partition plate 7 is in an arc shape, and the partition plate 7 includes a first curved portion 71 curved away from the arc-extinguishing chamber 16, and a second curved portion 72 curved toward the arc-extinguishing chamber 16, the second curved portion 72 is located on the side of the first curved portion 71 away from the arc-extinguishing chamber 16, and by the arc-shaped partition plate 7, the outflowing gas in the arc-extinguishing chamber 16 can be compressed, so that the gas flow can more easily push the baffle 4.

[0061] As shown in Figures 6-7 , the baffle 4 is in a flat plate shape, and the baffle 4 is tangent to the second curved portion 72, which can make the gas in the arc-extinguishing chamber 16 push the baffle 4 as vertically as possible, so that the baffle 4 can move to the second position more quickly to avoid the gas in the arc-extinguishing chamber 16.

[0062] Further, a guide rod 81 is connected with the baffle 4, a guide column 82 is arranged in the shell 1, a guide groove for inserting the guide rod 81 is arranged in the guide column 82, the guide rod 81 is driven to slide along the guide groove when the baffle 4 moves between the first position and the second position, the elastic member 5 is sleeved outside the guide column 82, the two ends of the elastic member 5 are in contact with the baffle 4 and the shell 1 respectively, the guide column 82 can not only play a guiding role for the movement of the baffle 4, but also play a role of limiting the elastic member 5. Preferably, the baffle 4 is arranged obliquely relative to the guide rod 81, the cross section of the guide rod 81 is circular in the embodiment, the cross section of the guide rod 81 can be square or other shapes, and the cross section of the guide groove is matched with the shape of the cross section of the guide rod 81. As shown in Figure 5 the sleeve 85 can be arranged outside the guide column 82. The elastic member 5 is a compression spring in the embodiment, the elastic member 5 can also be a torsion spring, a spring sheet or an elastic arm integrally formed with the baffle 4 as other embodiments, the elastic arm can be appropriately bent to generate elasticity through deformation. In addition, the baffle 4 is arranged to move linearly in the embodiment, the baffle 4 can also be arranged to rotate as other embodiments, one end is a rotating shaft and the other end rotates and limits the limiting structure 6. The limiting structure 6 can be an existing structure in the shell 1, or a newly arranged protrusion or convex shaft.

[0063] As shown in Figure 2 the first embodiment, the guide column 82 is arranged parallel to the length direction of the circuit breaker, the guide rod 81 is driven to move along the length direction of the circuit breaker when the baffle 4 moves between the first position and the second position, the side wall of the exhaust passage 3 away from one side of the exhaust hole 2 along the length direction of the circuit breaker constitutes the limiting structure 6, and the side wall of the exhaust passage 3 away from one side of the exhaust hole 2 along the height direction of the circuit breaker is in contact with the baffle 4 to play a sealing role.

[0064] As shown in Figure 3 the second embodiment, the guide column 82 is arranged parallel to the height direction of the circuit breaker, the guide rod 81 is driven to move along the height direction of the circuit breaker when the baffle 4 moves between the first position and the second position, the side wall of the exhaust passage 3 away from one side of the exhaust hole 2 along the height direction of the circuit breaker constitutes the limiting structure 6, and the side wall of the exhaust passage 3 away from one side of the exhaust hole 2 along the length direction of the circuit breaker is in contact with the baffle 4 to play a sealing role. It can be understood that the baffle 7 can not be arranged, the gas in the arc extinguishing chamber 16 can not be drained through the baffle 7, and the baffle 7 can also adopt other shapes, all of which belong to the protection scope of the utility model.

[0065] As shown in Figure 3 the exhaust hole 2 is arranged parallel to the height direction of the circuit breaker, the bottom of the shell 1 is provided with a protruding first mounting structure 91 and a second mounting structure 92 (see Figure 1), the first mounting structure 91 is provided with a sliding groove 94, the sliding groove 94 is provided with a limiting piece (not shown in the figure) which can move along the length direction of the circuit breaker, the mounting groove 93 is used for sleeving on a card rail (not shown in the figure), the limiting piece is used for limiting the card rail, the circuit breaker is mounted on the card rail, the mounting groove 93 is provided with a transverse plate 95 between the exhaust passage 3, the exhaust hole 2 is arranged on the transverse plate 95 and is communicated between the exhaust passage 3 and the mounting groove 93, the opening of the exhaust hole 2 is directed to the bottom of the circuit breaker, the gas can be discharged in the length direction of the circuit breaker, and the influence on the adjacent circuit breaker is reduced. Of course, the exhaust direction of the exhaust hole 2 can also be parallel to the length direction of the circuit breaker, which belongs to the protection scope of the utility model.

[0066] Specifically, the circuit breaker of the embodiment is a small circuit breaker, the shell 1 is in the shape of a Chinese character "N", the middle part of the shell 1 is provided with a protruding structure which protrudes along the height direction of the circuit breaker, the protruding structure is used for accommodating a handle 19, at least part of an operating mechanism 13 and at least part of a short-circuit release 15, the two ends of the shell 1 along the length direction of the circuit breaker are provided with a first wiring groove 171 and a second wiring groove, the first wiring groove 171 and the second wiring groove are used for accommodating a first wiring terminal 17 and a second wiring terminal 18 respectively, a static contact 12 and a moving contact 11 are arranged between an arc-extinguishing chamber 16 and the second wiring terminal 18, an overload release 14 is arranged between the second wiring terminal 18 and the moving contact 11, the short-circuit release 15 is located between the arc-extinguishing chamber 16 and the handle 19, and the short-circuit release 15 is connected between the first wiring terminal 17 and the static contact 12, one side of the first wiring groove 171 along the height direction of the circuit breaker is provided with a first mounting structure 91, and an exhaust passage 3 is located between the first wiring groove 171 and the first mounting structure 91, one side of the second wiring groove along the height direction of the circuit breaker is provided with a second mounting structure 92, and the second mounting structure 92 is provided with an adjusting screw which is used for pushing the overload release 14. Preferably, the exhaust hole 2 is in the shape of a long strip, and the length direction of the exhaust hole 2 is parallel to the width direction of the circuit breaker.

[0067] It should be noted that, in the description of the utility model, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship in use, and are only for the convenience of description, and cannot be understood as indicating that the devices or elements referred to must have a specific orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating relative importance.

[0068] The above is further detailed description of the utility model in combination with specific preferred embodiments, and cannot be deemed as limitation of the specific implementation of the utility model to these descriptions. For ordinary skilled persons in the technical field to which the utility model belongs, without departing from the concept of the utility model, a number of simple deductions or substitutions can be made, and all of them shall be deemed as belonging to the protection scope of the utility model.

Claims

1. A circuit breaker comprising a housing (1) and a moving contact (11), a stationary contact (12), an operating mechanism (13), an arc extinguishing chamber (16), a first terminal (17) and a second terminal (18) arranged in the housing (1) respectively, the first terminal (17) and the second terminal (18) being connected with the stationary contact (12) and the moving contact (11) respectively, the operating mechanism (13) being used to drive the moving contact (11) to contact and separate from the stationary contact (12), the housing (1) being provided with an exhaust hole (2), and the housing (1) being provided with an exhaust passage (3) communicating between the exhaust hole (2) and the arc extinguishing chamber (16), characterized in that: Further comprising a baffle (4), an elastic member (5) and a limiting structure (6), the baffle (4) is movable between a first position and a second position, the elastic member (5) is used to drive the baffle (4) to move to the first position, so that the baffle (4) is in contact with the limiting structure (6) and blocks the exhaust passage (3), the arc extinguishing gas discharged from the arc extinguishing chamber (16) can drive the baffle (4) to move to the second position away from the limiting structure (6) to open the exhaust passage (3), so that the arc extinguishing gas is discharged from the exhaust hole (2) through the exhaust passage (3).

2. The circuit breaker of claim 1, wherein: The arc extinguishing chamber (16) is provided with a partition plate (7) on one side close to the exhaust passage (3), one end of the partition plate (7) away from the arc extinguishing chamber (16) is arranged adjacent to the exhaust passage (3), and one end of the partition plate (7) close to the arc extinguishing chamber (16) is arranged spaced apart from the exhaust passage (3), so as to guide the arc extinguishing gas to the exhaust passage (3).

3. The circuit breaker of claim 2, wherein: The arc extinguishing chamber (16) is further provided with a second partition plate (73) on one side close to the exhaust passage (3), one end of the second partition plate (73) away from the arc extinguishing chamber (16) is connected with one end of the partition plate (7) away from the exhaust passage (3), and one end of the second partition plate (73) close to the arc extinguishing chamber (16) is located on one side of the partition plate (7) away from the exhaust passage (3), the partition plate (7) divides the arc extinguishing gas into two parts, one part of the arc extinguishing gas is guided to the exhaust passage (3) through the partition plate (7), and the other part of the arc extinguishing gas is guided to one side of the arc extinguishing chamber (16) away from the exhaust passage (3) through the second partition plate (73), and then returns to the arc extinguishing chamber (16) through the space between the moving contact (11) and the static contact (12).

4. The circuit breaker of claim 3, wherein: The arc extinguishing chamber (16) is provided with a short-circuit release device (15) on one side away from the exhaust passage (3), the arc extinguishing gas is guided to the short-circuit release device (15) through the second partition plate (73) first, and then returns to the arc extinguishing chamber (16) through the space between the moving contact (11) and the static contact (12).

5. The circuit breaker of claim 2, wherein: The end of the partition plate (7) close to the arc extinguishing chamber (16) is correspondingly arranged in the middle of the second partition plate (73) close to the arc extinguishing chamber (16).

6. The circuit breaker of claim 2, wherein: The partition plate (7) is in the shape of an arc surface, the partition plate (7) comprises a first curved portion (71) curved away from the arc extinguishing chamber (16), and a second curved portion (72) curved close to the arc extinguishing chamber (16), and the second curved portion (72) is located on one side of the first curved portion (71) away from the arc extinguishing chamber (16).

7. The circuit breaker of claim 6, wherein: The baffle (4) is in the shape of a flat plate, and the baffle (4) is tangent to the second curved portion (72).

8. The circuit breaker of claim 1, wherein: The baffle (4) is linearly slidably arranged in the shell (1), or the baffle (4) is rotatably arranged in the shell (1).

9. The circuit breaker of claim 1, wherein: Further comprising a guide rod (81) connected with the baffle (4), a guide column (82) is arranged in the shell (1), a guide groove for inserting the guide rod (81) is arranged in the guide column (82), and the baffle (4) drives the guide rod (81) to slide along the guide groove when moving between the first position and the second position.

10. The circuit breaker of claim 9, wherein: The elastic member (5) is sleeved outside the guide column (82), and two ends of the elastic member (5) are in contact with the baffle (4) and the shell (1) respectively.

11. The circuit breaker of claim 9, wherein: The baffle (4) is arranged obliquely relative to the guide rod (81).

12. The circuit breaker of claim 9, wherein: The guide column (82) is arranged in parallel with the length direction of the circuit breaker, the guide rod (81) is driven to move in the length direction of the circuit breaker when the baffle (4) moves between the first position and the second position, the side wall of the exhaust passage (3) away from one side of the exhaust hole (2) in the length direction of the circuit breaker constitutes the limiting structure (6), and the side wall of the exhaust passage (3) away from one side of the exhaust hole (2) in the height direction of the circuit breaker is in contact with the baffle (4).

13. The circuit breaker of claim 1, wherein: The exhaust direction of the exhaust hole (2) is arranged in parallel with the height direction of the circuit breaker.

14. The circuit breaker of claim 13, wherein: The bottom of the shell (1) is provided with a first mounting structure (91) and a second mounting structure (92), a mounting groove (93) is arranged between the first mounting structure (91) and the second mounting structure (92), a sliding groove (94) is arranged in the first mounting structure (91), a limiting member capable of moving in the length direction of the circuit breaker is arranged in the sliding groove (94), a transverse plate (95) is arranged between the sliding groove (94) and the exhaust passage (3), and the exhaust hole (2) is arranged on the transverse plate (95) and communicates between the exhaust passage (3) and the mounting groove (93).

15. The circuit breaker of claim 1, wherein: The circuit breaker is a small circuit breaker, the shell (1) is in the shape of a Chinese character "K", a convex structure protruding in the height direction of the circuit breaker is arranged in the middle of the shell (1), the convex structure is used for accommodating a handle (19), at least part of an operating mechanism (13) and at least part of a short-circuit release (15), first and second wiring grooves are arranged at two ends of the shell (1) in the length direction of the circuit breaker, the first and second wiring grooves are used for accommodating first and second wiring terminals (17) and (18) respectively, a static contact (12) and a movable contact (11) are arranged between an arc-extinguishing chamber (16) and the second wiring terminal (18), an overload release (14) is arranged between the second wiring terminal (18) and the movable contact (11), and the short-circuit release (15) is arranged between the arc-extinguishing chamber (16) and the handle (19) and is connected between the first wiring terminal (17) and the static contact (12).

16. The circuit breaker of claim 15, wherein: One side of the first wiring groove (171) in the height direction of the circuit breaker is provided with the first mounting structure (91), the exhaust passage (3) is located between the first wiring groove (171) and the first mounting structure (91), one side of the second wiring groove in the height direction of the circuit breaker is provided with the second mounting structure (92), and a mounting groove (93) is arranged between the first mounting structure (91) and the second mounting structure (92).

17. The circuit breaker of either of claims 1 or 16, wherein: The exhaust hole (2) is in the shape of a long strip, and the length direction of the exhaust hole (2) is arranged in parallel with the width direction of the circuit breaker.

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