Circuit breaker

Abstract

The utility model discloses a circuit breaker, and relates to the technical field of circuit breakers, and the circuit breaker comprises a housing, a static contact plate, an arc isolation assembly, an arc baffle plate, and a magnetic conductive block. The static contact plate is arranged on the shell. The arc isolating assembly is installed on the shell, an arc isolating cavity is defined on the arc isolating assembly, and the static contact plate can seal part of the arc isolating cavity. The arc blocking plate is arranged on the shell and located on the side, close to the arc isolating assembly, of the static contact plate, a backflow groove is formed in the arc blocking plate, and the backflow groove is opposite to the arc isolating cavity. The magnetic conductive block is arranged on the shell and located on the side, away from the arc isolation cavity, of the static contact plate, and the magnetic conductive block can generate a magnetic field and act on the electric arc so that the electric arc can move towards the arc isolation cavity along the backflow groove. According to the circuit breaker provided by the invention, the possibility of arc diffusion and leakage arc can be reduced, and the use safety of the circuit breaker is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit breakers, in particular to a circuit breaker. BACKGROUND

[0002] A circuit breaker is a switching device capable of realizing fast connection and disconnection of a current-carrying circuit. An arc is usually generated at a contact assembly in the circuit breaker at the moment when the circuit breaker connects or disconnects the circuit. The generated arc is likely to cause damage to the circuit breaker and the personnel operating the circuit breaker.

[0003] Most existing circuit breakers are provided with an arc separation assembly and an arc extinguishing assembly. The arc separation assembly limits the diffusion of the arc and guides the arc to the arc extinguishing assembly to extinguish the arc. However, since there is an assembly gap between the arc separation assembly and the contact assembly, the arc is likely to leak from the assembly gap to the space outside the arc separation assembly and the arc extinguishing assembly, which affects the safe use of the circuit breaker.

[0004] Therefore, it is urgent to provide a circuit breaker to solve the problems in the prior art. CONTENT OF THE INVENTION

[0005] The present application aims to provide a circuit breaker capable of reducing the diffusion of the arc to the operating mechanism and the operating handle and improving the use safety of the circuit breaker.

[0006] In a first aspect, the present application provides a circuit breaker, which comprises a housing, a static contact plate, an arc separation assembly, an arc blocking plate and a magnetic conducting block. The static contact plate is arranged on the housing. The arc separation assembly is arranged on the housing, and an arc separation cavity is formed around the arc separation assembly. The static contact plate can close part of the arc separation cavity. The arc blocking plate is arranged on the housing and located on the side of the static contact plate close to the arc separation assembly. The arc blocking plate is provided with a backflow groove opposite to the arc separation cavity. The magnetic conducting block is arranged on the housing and located on the side of the static contact plate away from the arc separation cavity. The magnetic conducting block can generate a magnetic field and act on the arc to move the arc along the backflow groove to the arc separation cavity.

[0007] By arranging the arc blocking plate and the magnetic conducting block on the housing of the circuit breaker, the backflow groove arranged on the arc blocking plate can make the arc leaked from the arc separation cavity flow back to the arc separation cavity. Meanwhile, the magnetic field generated by the magnetic conducting block can also act on the arc to guide the arc to move from the backflow groove to the arc separation cavity, further reducing the possibility of the arc leaking from the arc separation cavity, thereby reducing the risk of damage to the circuit breaker or electric shock accidents caused by the diffusion of the arc. Therefore, even if there is an assembly gap between the arc separation assembly and the contact assembly, the circuit breaker provided by the present application is not likely to leak the arc, which improves the use safety of the circuit breaker.

[0008] In some examples, the magnetic conducting block comprises a main body part, first and second positioning grooves oppositely arranged on the main body part, and the shell comprises first and second protrusions oppositely arranged, the first positioning groove is connected to the first protrusion, and the second positioning groove is connected to the second protrusion.

[0009] The first and second positioning grooves and the first and second protrusions are matched to fix the magnetic conducting block on the shell, improve the assembly stability of the magnetic conducting block, and improve the stability of the magnetic field provided by the magnetic conducting block, so that the arc between the arc baffle and the static contact plate can be subjected to stable magnetic field force and move to the arc separation cavity, thereby improving the arc separation effect.

[0010] In some examples, the magnetic conducting block further comprises a first bending segment connected to the main body part, and the static contact plate is provided with a second bending segment, the first bending segment being adapted to the second bending segment.

[0011] The first bending segment on the magnetic conducting block and the second bending segment on the static contact plate are adapted to increase the matching length of the magnetic conducting block and the static contact plate, on the one hand, the magnetic field strength generated on the magnetic conducting block can be enhanced, the magnetic field force on the arc is larger, which is conducive to preventing the arc from spreading, on the other hand, the action range of the magnetic conducting block can be increased, so that more arcs can be subjected to the action of the magnetic field force, further reducing the possibility of arc leakage, thereby improving the arc separation effect.

[0012] In some examples, the main body part is provided with a third bending segment, the third bending segment and the first bending segment are located on opposite sides of the main body part, and the static contact plate is provided with an arc guiding corner, the third bending segment being adapted to the arc guiding corner.

[0013] The third bending segment is arranged to adapt to the arc guiding corner on the static contact plate, the arc guiding corner can be in communication with the arc extinguishing assembly in the circuit breaker, the magnetic field generated on the magnetic conducting block is extended to the arc guiding corner through the third bending segment, so that the arc can move along the contact segment to the arc guiding corner under the action of the magnetic field force, further reducing the possibility of arc leakage and spreading between the static contact plate and the arc separation assembly, which is conducive to the accurate transfer of the arc from the static contact plate and the arc separation cavity to the arc extinguishing assembly for arc extinction.

[0014] In some examples, the shell is provided with a mounting groove, the mounting groove and part of the arc separation assembly enclose a mounting hole, and the magnetic conducting block is mounted in the mounting hole.

[0015] The mounting groove is arranged to improve the assembly stability of the magnetic conducting block on the shell. The slot of the mounting groove is closed by part of the arc separation assembly to enclose the mounting hole, which can further improve the assembly stability of the magnetic conducting block on the shell and make the magnetic conducting block accurately correspond to the arc separation cavity.

[0016] In some examples, the arc baffle comprises first and second arc blocking segments and a bending part, the bending part being arranged between the first and second arc blocking segments to form a backflow groove.

[0017] The arc blocking plate formed by connecting the first arc blocking segment, the bending part and the second arc blocking segment can not only block the arc diffusion, but also guide the arc diffused from the arc separation cavity to move back into the arc separation cavity, effectively reducing the risk of damage caused by arc diffusion.

[0018] In some examples, the housing is provided with a blocking wall, and the circuit breaker further comprises an operating mechanism arranged on the housing, and the blocking wall is located between the operating mechanism and the arc separation assembly.

[0019] The arrangement of the blocking wall can isolate the operating mechanism and the arc separation assembly, reduce the possibility of arc leakage from between the arc separation cavity and the contact assembly and diffusion to the operating mechanism, thereby effectively reducing the risk of electric shock caused by arc diffusion and improving the use safety of the circuit breaker.

[0020] In some examples, the circuit breaker further comprises a movable contact, which is rotationally arranged on the housing, and the movable contact is provided with an extension arm, which is arranged on one side of the movable contact close to the static contact plate and extends towards the static contact plate.

[0021] The extension arm extends from the movable contact towards the static contact plate to form a blocking structure between the movable contact and the static contact plate, so as to block the movement of the arc away from the arc separation assembly when the arc is generated by the separation of the movable contact and the static contact plate, thereby reducing the risk of damage to other structures caused by the arc.

[0022] In some examples, the extension arm extends in a direction opposite to the extension direction of the second arc blocking segment.

[0023] The extension arm and the second arc blocking segment can be matched with each other in this arrangement, further enhancing the blocking effect of the arc, preventing the arc from moving away from the arc separation assembly along the static contact plate and the movable contact, and effectively reducing the risk of damage caused by the diffusion of the arc away from the arc separation assembly. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0025] Figure 1 The exploded view of the circuit breaker provided in the embodiments of the present application.

[0026] Figure 2 The structural schematic diagram of the static contact plate, the arc separation assembly, the arc blocking plate and the magnetic conducting block installed in the housing provided in the embodiments of the present application.

[0027] Figure 3 A structure schematic diagram of the magnetic conducting block provided by the embodiment of the present application is installed in the shell.

[0028] Figure 4 A structure schematic diagram of the magnetic conducting block provided by the embodiment of the present application.

[0029] Figure 5 A structure schematic diagram of the magnetic conducting block provided by the embodiment of the present application is installed in the shell.

[0030] Figure 6 A structure schematic diagram of the magnetic conducting block provided by the embodiment of the present application is installed in the shell.

[0031] Figure 7 A structure schematic diagram of the magnetic conducting block provided by the embodiment of the present application is installed in the shell.

[0032] Figure 8 A structure schematic diagram of the magnetic conducting block provided by the embodiment of the present application is installed in the shell.

[0033] Figure 9 A structure schematic diagram of the magnetic conducting block provided by the embodiment of the present application is installed in the shell.

[0034] Explanation of reference signs:

[0035] 100, circuit breaker; 1, shell; 11, mounting groove; 12, first boss; 13, blocking wall; 14, first mounting hole; 15, second mounting hole; 2, static contact plate; 21, second bending section; 22, arc striking angle; 23, contact section; 3, arc separation assembly; 31, arc separation cavity; 32, first arc separation plate; 321, first side wall; 33, second arc separation plate; 331, second side wall; 4, arc blocking plate; 41, backflow groove; 42, first arc blocking section; 43, bending part; 44, second arc blocking section; 5, magnetic conducting block; 51, main body part; 511, first positioning groove; 512, second positioning groove; 513, third bending section; 52, first bending section; 6, moving contact; 61, extension arm. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the application.

[0038] It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0039] In the description of the application, it should be noted that the terms "in", "out" 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 commonly placed when the product of the application is used, only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0040] In the description of the application, it should also be noted that unless otherwise explicitly specified and limited, the terms "set", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0041] At the moment of closing and opening, the moving contact and the static contact plate in the circuit breaker are prone to produce arc, and the high temperature and high pressure of the arc are prone to cause damage to the components in the circuit breaker, and even cause electric shock accident, so the existing circuit breaker usually has an arc separation component and an arc extinguishing component to reduce the possibility of damage caused by arc diffusion.

[0042] However, due to the gap or misalignment between the static contact plate and the arc separation component, and between the moving contact and the arc separation component, the arc is prone to leak out and diffuse to the space outside the arc separation component and the arc extinguishing component, affecting the safety of the circuit breaker.

[0043] Based on this, the embodiments of the application provide a circuit breaker which can reduce the possibility of arc diffusion and leakage, and improve the safety of the circuit breaker.

[0044] In order for those skilled in the art to better understand the application scheme, the technical solutions in the embodiments of the application will be described clearly and completely in conjunction with the drawings.

[0045] Please refer to Figures 1 to 3 The embodiment provides a circuit breaker 100, which comprises a shell 1, a static contact plate 2, an arc separation assembly 3, an arc blocking plate 4 and a magnetic conducting block 5. The static contact plate 2 is arranged on the shell 1. The arc separation assembly 3 is installed on the shell 1, and an arc separation cavity 31 is formed on the arc separation assembly 3, and the static contact plate 2 can close part of the arc separation cavity 31. The arc blocking plate 4 is arranged on the shell 1 and located on the side of the static contact plate 2 close to the arc separation assembly 3, and a backflow groove 41 is arranged on the arc blocking plate 4 and opposite to the arc separation cavity 31. The magnetic conducting block 5 is arranged on the shell 1 and located on the side of the static contact plate 2 away from the arc separation cavity 31, and the magnetic conducting block 5 can generate a magnetic field and act on the electric arc to make the electric arc move along the backflow groove 41 to the arc separation cavity 31.

[0046] By arranging the arc blocking plate 4 and the magnetic conducting block 5 on the shell 1 of the circuit breaker 100, the electric arc leaked from the arc separation cavity 31 can flow back to the arc separation cavity 31 through the backflow groove 41 arranged on the arc blocking plate 4, and the electric arc can also be guided to move from the backflow groove 41 to the arc separation cavity 31 through the magnetic field generated by the magnetic conducting block 5, so that the possibility of the electric arc leaking from the arc separation cavity 31 is further reduced, thereby reducing the risk of damage to the circuit breaker 100 or electric shock accidents caused by the diffusion of the electric arc. Therefore, even if there is an assembly gap between the arc separation assembly 3 and the contact assembly, the circuit breaker 100 provided by the application is not prone to electric arc leakage, and the use safety of the circuit breaker 100 is improved.

[0047] The shell 1 generally comprises a base and a cover, and an installation cavity can be formed between the base and the cover. The static contact plate 2, the arc separation assembly 3, the arc blocking plate 4 and the magnetic conducting block 5 and other components are installed in the installation cavity. The shell 1 can not only play a role in assembling and supporting the aforementioned components, but also play a role in preventing accidental touch and electric leakage.

[0048] The static contact plate 2 is fixedly installed in the installation cavity, and the static contact plate 2 generally cooperates with a movable contact 6 also arranged in the installation cavity of the shell 1 to realize the conduction and disconnection of the circuit breaker 100.

[0049] Referring to Figure 2 The arc separation assembly 3 generally comprises a first arc separation plate 32 and a second arc separation plate 33 arranged at intervals, and the interval space between the first arc separation plate 32 and the second arc separation plate 33 forms the arc separation cavity 31. Part of the static contact plate 2 corresponds to the opening of the arc separation cavity 31 and is attached to the first arc separation plate 32 and the second arc separation plate 33 to close the opening of the arc separation cavity 31 corresponding to the static contact plate 2. This is conducive to the electric arc generated on the static contact plate 2 entering the arc separation cavity 31 and reducing the possibility of the electric arc leaking from the opening of the arc separation cavity 31 close to the static contact plate 2.

[0050] The arc baffle plate 4 is arranged on the shell 1, specifically, the arc baffle plate 4 can be fixedly connected in the mounting cavity of the shell 1 in a connecting structure, or the arc baffle plate 4 can be arranged in an integrated structure with the shell 1. In this embodiment, the arc baffle plate 4 is integrally arranged on the base, and the arc baffle plate 4 extends to the cover body and abuts against the cover body, so that a stable arc blocking effect can be achieved in the mounting cavity.

[0051] With reference to Figure 2 and Figure 3 , the arc baffle plate 4 is arranged on the side of the static contact plate 2 close to the arc separation assembly 3, and the arc baffle plate 4 is provided with a backflow groove 41 opposite to the arc separation cavity 31, that is, the slot of the backflow groove 41 faces the arc separation cavity 31. After the arc leaked from the arc separation cavity 31 to the direction of the arc baffle plate 4 is blocked by the arc baffle plate 4, the arc moves along the groove wall of the backflow groove 41 and finally returns to the arc separation cavity 31. In this way, the possibility of arc leakage from the gap between the arc separation cavity 31 and the static contact plate 2 can be effectively reduced, thereby reducing the risk of damage caused by arc diffusion.

[0052] In addition, with reference to Figure 2 and Figure 3 , the magnetic conducting block 5 is arranged on the side of the static contact plate 2 away from the arc separation assembly 3, and the magnetic conducting block 5 is opposite to the arc separation assembly 3. The magnetic conducting block 5 can generate a magnetic field under the action of current, and the magnetic field generated by the magnetic conducting block 5 can cover the space between the arc separation cavity 31 and the arc baffle plate 4, and the magnetic field force generated can make the arc in the space have a tendency to move from the arc baffle plate 4 to the arc separation cavity 31. In this way, the arc baffle plate 4 can assist in guiding the arc to flow back into the arc separation cavity 31, thereby enabling the arc to move along the arc separation assembly 3 to the arc extinguishing assembly, effectively reducing the risk of damage caused by arc leakage from the gap between the arc separation assembly 3 and the static contact plate 2.

[0053] With reference to Figure 3 and Figure 4 , in some examples, the magnetic conducting block 5 includes a main body portion 51, and the main body portion 51 is oppositely provided with a first positioning groove 511 and a second positioning groove 512. The shell 1 includes a first boss 12 and a second boss (not shown in the figure) arranged opposite to each other, and the first positioning groove 511 is correspondingly connected with the first boss 12, and the second positioning groove 512 is correspondingly connected with the second boss.

[0054] With the cooperation of the first positioning groove 511 and the first boss 12, and the second positioning groove 512 and the second boss, the magnetic conducting block 5 can be fixedly installed on the shell 1, improving the assembly stability of the magnetic conducting block 5 so as to improve the stability of the magnetic field provided by the magnetic conducting block 5, thereby enabling the arc between the arc baffle plate 4 and the static contact plate 2 to be subjected to stable magnetic field force and move into the arc separation cavity 31, and thereby improving the arc separation effect.

[0055] Specifically, the first positioning groove 511 and the second positioning groove 512 are arranged on the opposite two side edges of the main body part 51, and the openings of the first positioning groove 511 and the second positioning groove 512 face opposite directions. The first boss 12 is arranged on the base, and the second boss is arranged on the cover body, and the first boss 12 and the second boss are opposite in position in the mounting cavity. In this way, the magnetic conducting block 5 can be positioned and mounted with the base through the first positioning groove 511 and the first boss 12, and positioned and mounted with the cover body through the second positioning groove 512 and the second boss, so as to ensure that the magnetic conducting block 5 remains fixed in the mounting cavity.

[0056] Referring to Figure 4 and Figure 5 In some examples, the magnetic conducting block 5 further comprises a first bent section 52 connected with the main body part 51, and the static contact plate 2 is provided with a second bent section 21, and the first bent section 52 is adapted to the second bent section 21.

[0057] The first bent section 52 on the magnetic conducting block 5 is adapted to the second bent section 21 on the static contact plate 2, which can increase the fitting length of the magnetic conducting block 5 and the static contact plate 2. On the one hand, it can enhance the magnetic field strength generated on the magnetic conducting block 5, so that the magnetic field force on the arc is larger, which is conducive to preventing the arc from spreading. On the other hand, it can increase the range of action of the magnetic conducting block 5, so that more arcs can be affected by the magnetic field force, further reducing the possibility of arc leakage, thereby improving the arc isolation effect.

[0058] Specifically, the static contact plate 2 further comprises a contact section 23, referring to Figure 8 , the contact section 23 abuts against the arc isolation assembly 3 and closes part of the arc isolation cavity 31, and the contact section 23 is used to contact the moving contact 6 to realize the conduction of the circuit. The second bent section 21 of the static contact plate 2 is bent away from the side of the arc isolation assembly 3 relative to the contact section 23, and is adapted to the arc isolation assembly 3 and the moving contact 6.

[0059] The magnetic conducting block 5 is arranged on the side of the static contact plate 2 away from the arc isolation assembly 3. The main body part 51 on the magnetic conducting block 5 is in close contact with the contact section 23, and the first bent section 52 on the magnetic conducting block 5 is bent relative to the main body part 51, and the bending direction is the same as that of the second bent section 21, so the first bent section 52 is in close contact with the second bent section 21. In this way, the fitting tightness between the magnetic conducting block 5 and the static contact plate 2 can be improved, and it is ensured that the magnetic conducting block 5 can accurately act on the arc moving along the static contact plate 2, avoiding the arc from leaking out between the arc isolation cavity 31 and the static contact plate 2.

[0060] Referring to Figure 4 and Figure 5 In some examples, the main body part 51 is provided with a third bent section 513, the third bent section 513 and the first bent section 52 are located on opposite sides of the main body part 51, the static contact plate 2 is provided with an arc guiding corner 22, and the third bent section 513 is adapted to the arc guiding corner 22.

[0061] The third bending section 513 is arranged to adapt to the arc leading angle 22 on the static contact plate 2, which can be in communication with the arc extinguishing assembly in the circuit breaker 100. The magnetic field generated on the magnetic conducting block 5 is extended to the arc leading angle 22 through the third bending section 513, so that the electric arc can move along the contact section 23 to the arc leading angle 22 under the action of the magnetic field force, further reducing the possibility of electric arc leakage and diffusion between the static contact plate 2 and the arc separation assembly 3, and facilitating the accurate transfer of the electric arc from the static contact plate 2 and the arc separation cavity 31 to the arc extinguishing assembly for arc extinguishing.

[0062] Specifically, the third bending section 513 is arranged on the side of the main body part 51 away from the first bending section 52, and the arc leading angle 22 is arranged on the side of the contact section 23 away from the second bending section 21. The bending direction of the third bending section 513 relative to the main body part 51 is the same as the bending direction of the arc leading angle 22 relative to the contact section 23, and the third bending section 513 is in close contact with the arc leading angle 22. In this way, the magnetic field on the third bending section 513 can stably act on the electric arc between the arc leading angle 22 and the arc separation cavity 31, so that the electric arc can smoothly move along the arc leading angle 22 to the arc extinguishing assembly.

[0063] Referring to Figures 6 to 8 In some examples, the housing 1 is provided with a mounting groove 11, and the mounting groove 11 forms a mounting hole in cooperation with part of the arc separation assembly 3, and the magnetic conducting block 5 is installed in the mounting hole.

[0064] The mounting groove 11 is arranged to improve the assembly stability of the magnetic conducting block 5 on the housing 1. The slot of the mounting groove 11 is closed by the part of the arc separation assembly 3 to form a mounting hole, which can further improve the assembly stability of the magnetic conducting block 5 on the housing 1, so that the magnetic conducting block 5 accurately corresponds to the arc separation cavity 31.

[0065] Specifically, referring to Figures 6 to 8 The mounting groove 11 can be composed of two parts, one part is located on the base of the housing 1, and the other part is located on the cover of the housing 1, and the two parts of the mounting groove 11 are located at opposite positions in the mounting cavity.

[0066] The first arc separation plate 32 is provided with a first side wall 321 on the side close to the static contact plate 2, and the second arc separation plate 33 is provided with a second side wall 331 on the side close to the static contact plate 2. The first side wall 321 and the mounting groove 11 on the base form a first mounting hole 14, and the second side wall and the mounting groove 11 on the cover form a second mounting hole 15. In this way, the first mounting hole 14 and the second mounting hole 15 form the aforementioned mounting hole.

[0067] Based on this, the part of the magnetic conducting block 5 close to the first arc separation plate 32 can be fixed in the first mounting hole 14, and the part of the magnetic conducting block 5 close to the second arc separation plate 33 can be fixed in the second mounting hole 15, which greatly improves the assembly stability of the magnetic conducting block 5.

[0068] Referring to Figure 6 and Figure 7 In some examples, the arc-shielding plate 4 includes a first arc-shielding segment 42, a bending portion 43, and a second arc-shielding segment 44, the bending portion 43 is arranged between the first arc-shielding segment 42 and the second arc-shielding segment 44 to form a backflow groove 41.

[0069] The arc-shielding plate 4 formed by connecting the first arc-shielding segment 42, the bending portion 43, and the second arc-shielding segment 44 can not only block the diffusion of the arc but also guide the arc diffused from the arc-shielding cavity 31 to move back into the arc-shielding cavity 31, effectively reducing the risk of damage caused by the diffusion of the arc.

[0070] The arc-shielding plate 4 is arranged close to one side of the second bending segment 21 of the stationary contact plate 2, and further, the first arc-shielding segment 42 is arranged close to the second bending segment 21, the first arc-shielding segment 42 is parallel to the second bending segment 21, and the first arc-shielding segment 42 is located between the second bending segment 21 and the arc-shielding cavity 31, so that the arc moving from the arc-shielding cavity 31 along the stationary contact plate 2 to the outside of the arc-shielding cavity 31 can move onto the first arc-shielding segment 42.

[0071] The bending portion 43 is bent away from the side of the stationary contact plate 2 relative to the first arc-shielding segment 42, the bending portion 43 is arranged in an arc-shaped structure, and the side of the bending portion 43 away from the first arc-shielding segment 42 is close to the arc-shielding assembly 3. The second arc-shielding segment 44 is arranged on the side of the bending portion 43 away from the first arc-shielding segment 42 and extends to the arc-shielding assembly 3. With this arrangement, an included angle can be formed between the first arc-shielding segment 42 and the second arc-shielding segment 44, and the arc-shaped bending portion 43 can form a backflow groove 41 for guiding the backflow of the arc, so that the arc moving onto the first arc-shielding segment 42 can backflow into the arc-shielding cavity 31 along the bending portion 43 and the second arc-shielding segment.

[0072] Referring to Figure 6 and Figure 9 In some examples, the first arc-shielding segment 42 abuts against the stationary contact plate 2, which can prevent the arc from diffusing out of the gap between the first arc-shielding segment 42 and the stationary contact plate 2, and ensure that the arc can backflow into the arc-shielding cavity 31 along the backflow groove 41 on the arc-shielding plate 4.

[0073] Referring to Figures 6 to 8 In some examples, the housing 1 is provided with a blocking wall 13, and the circuit breaker 100 further includes an operating mechanism arranged on the housing 1, and the blocking wall 13 is located between the operating mechanism and the arc-shielding assembly 3.

[0074] The arrangement of the blocking wall 13 can isolate the operating mechanism and the arc-shielding assembly 3, reduce the possibility of the arc leaking out from between the arc-shielding cavity 31 and the contact assembly and diffusing to the operating mechanism, and thus effectively reduce the risk of electric shock caused by the diffusion of the arc, and improve the use safety of the circuit breaker 100.

[0075] Specifically, the blocking wall 13 comprises two parts, a first blocking wall and a second blocking wall, the first blocking wall is arranged on the base, and the second blocking wall is arranged on the cover body, the positions of the first blocking wall and the second blocking wall are opposite, and the first blocking wall and the second blocking wall can form a complete isolation structure to completely isolate the arc separation assembly 3 and the operating mechanism in the mounting cavity, thereby effectively reducing the possibility of electric shock accidents caused by the diffusion of the electric arc to the operating mechanism.

[0076] The blocking wall 13 is arranged in an integrated structure with the shell 1, and has the characteristics of simple structure, easy manufacturing and high structural stability.

[0077] Referring to FIGS. 1 to 4 Figure 6 and Figure 9 In some examples, the circuit breaker 100 further comprises a movable contact 6, the movable contact 6 is rotatably arranged on the shell 1, the movable contact 6 is provided with an extension arm 61, the extension arm 61 is arranged on one side of the movable contact 6 close to the static contact plate 2, and the extension arm 61 extends towards the static contact plate 2.

[0078] The extension arm 61 extends from the movable contact 6 to the direction of the static contact plate 2, and can form a blocking structure between the movable contact 6 and the static contact plate 2, so that when the electric arc is generated by the separation of the movable contact 6 and the static contact plate 2, the electric arc can be blocked from moving away from the arc separation assembly 3 between the movable contact 6 and the static contact plate 2, thereby reducing the risk of damage caused by the diffusion of the electric arc to other structures.

[0079] Specifically, the movable contact 6 is rotatably arranged on the shell 1, when the circuit breaker 100 is disconnected, the movable contact 6 rotates away from the static contact plate 2, the extension arm 61 is located between the movable contact 6 and the static contact plate 2, the extension arm 61 is opposite to the arc separation assembly 3, so that the electric arc generated between the movable contact 6 and the static contact plate 2 cannot move away from the arc separation assembly 3, thereby further reducing the risk of damage caused by the diffusion of the electric arc.

[0080] Referring to FIGS. 1 to 4 Figure 6 and Figure 9 In some examples, the extension arm 61 is opposite to the extension direction of the second arc blocking segment 44.

[0081] With this arrangement, the extension arm 61 and the second arc blocking segment 44 can cooperate with each other to further enhance the blocking effect of the electric arc, prevent the electric arc from moving away from the arc separation assembly 3 along the static contact plate 2 and the movable contact 6, and effectively reduce the risk of damage caused by the diffusion of the electric arc away from the arc separation assembly 3.

[0082] Specifically, the extension arm 61 extends towards the static contact plate 2, the arc blocking plate 4 is arranged at a position close to the static contact plate 2, and the second arc blocking segment 44 extends towards the movable contact 6, so that the extension arm 61 and the second arc blocking segment 44 are on the same straight line, forming a stable arc separation belt to achieve a stable arc separation effect.

[0083] The above descriptions are only the preferred embodiment of the present application, but not for limiting the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A circuit breaker characterized by, The circuit breaker comprises a housing, a static contact plate arranged in the housing, an arc separation assembly arranged in the housing, the arc separation assembly being surrounded by an arc separation cavity, and the static contact plate being capable of closing part of the arc separation cavity, an arc blocking plate arranged in the housing and located on a side of the static contact plate close to the arc separation assembly, the arc blocking plate being provided with a backflow groove opposite the arc separation cavity, and a magnetic conducting block arranged in the housing and located on a side of the static contact plate away from the arc separation cavity, the magnetic conducting block being capable of generating a magnetic field and acting on an arc to move the arc along the backflow groove to the arc separation cavity. The magnetic conducting block comprises a main body part, the main body part being provided with a first positioning groove and a second positioning groove arranged oppositely, the housing comprises a first boss and a second boss arranged oppositely, the first positioning groove is connected to the first boss in correspondence, and the second positioning groove is connected to the second boss in correspondence. The magnetic conducting block further comprises a first bending section connected to the main body part, the static contact plate is provided with a second bending section, and the first bending section is adapted to the second bending section. The main body part is provided with a third bending section, the third bending section and the first bending section are located on opposite sides of the main body part, the static contact plate is provided with an arc guiding corner, and the third bending section is adapted to the arc guiding corner. The housing is provided with a mounting groove, the mounting groove and part of the arc separation assembly form a mounting hole, and the magnetic conducting block is mounted in the mounting hole. The arc blocking plate comprises a first arc blocking section, a bending part and a second arc blocking section, the bending part is arranged between the first arc blocking section and the second arc blocking section to form the backflow groove.

2. The circuit breaker of claim 1, wherein, The housing is provided with a blocking wall, the circuit breaker further comprises an operating mechanism arranged on the housing, and the blocking wall is located between the operating mechanism and the arc separation assembly.

3. The circuit breaker of claim 2, wherein, The circuit breaker further comprises a moving contact, the moving contact is rotatably arranged in the housing, the moving contact is provided with an extension arm, the extension arm is arranged on a side of the moving contact close to the static contact plate, and the extension arm extends to the static contact plate.

4. The circuit breaker of claim 3, wherein, The extension arm is opposite to the extension direction of the second arc blocking section.

5. The circuit breaker of any one of claims 1-4, wherein, ​ 6. The circuit breaker of any one of claims 1-4, wherein, ​ 7. The circuit breaker of any one of claims 1-4, wherein, ​ 8. The circuit breaker of claim 6, wherein, ​ 9. The circuit breaker of claim 8, wherein, ​

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