circuit breaker

Abstract

The embodiment of the present application provides a circuit breaker, which comprises a shell, a rotating mechanism, an operating mechanism, a locking mechanism and a tripping assembly, the shell comprises a first part, a second part and a third part arranged in sequence in a first direction, the interiors of the first part, the second part and the third part are communicated with each other, the height of the second part in a second direction is less than the heights of the first part and the third part in the second direction, so that the first part, the second part and the third part form a containing space by being half-enclosed outside the shell; an operating space is arranged in the containing space, the rotating mechanism and the tripping assembly are arranged in the shell, wherein the tripping assembly is configured to drive the locking mechanism to move when the current in the circuit breaker is abnormal, so as to drive the moving contact to move away from the static contact. The circuit breaker provided by the embodiment of the present application can improve the breaking capacity and arc extinguishing effect of the circuit breaker under high voltage level.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electrical equipment, and particularly relates to a circuit breaker. BACKGROUND

[0002] With the continuous development of the market, more and more occasions need to use high-voltage grade molded case circuit breakers, such as AC 1150V, DC 1500V, etc. Most manufacturers in the industry directly derive products based on existing mature molded case circuit breakers, but these derived products cannot be well applied to these occasions because they have more or less some quality problems, for example, insufficient insulation capacity, low breaking capacity (in the existing structure, it is impossible to arrange enough capacity of arc extinguishing chamber), and even in the case of high voltage grade, the basic isolation performance is discounted, and the arc extinguishing effect is also greatly discounted. SUMMARY

[0003] The circuit breaker provided by the application can improve the breaking capacity and arc extinguishing effect of the circuit breaker under high voltage grade.

[0004] Embodiments of the first aspect of the application provide a circuit breaker, the circuit breaker comprising a shell, a rotating mechanism, an operating mechanism, a locking mechanism and a tripping assembly, the shell comprising a first part, a second part and a third part arranged in sequence in a first direction, interiors of the first part, the second part and the third part being in communication with each other, a height of the second part in a second direction being less than heights of the first part and the third part in the second direction, so that the first part, the second part and the third part form an accommodation space by being half-enclosed outside the shell, the first direction intersecting the second direction; the rotating mechanism being rotationally connected in the first part; the operating mechanism being arranged in the accommodation space and connected to the rotating mechanism, for driving a moving contact connected to the rotating mechanism to move away from or close to a stationary contact; the locking mechanism being arranged in the accommodation space, the locking mechanism driving the moving contact to move by the operating mechanism; the tripping assembly being arranged in the third part, the tripping assembly being configured to drive the locking mechanism to move when an abnormal current is in the circuit breaker, so as to drive the moving contact to move away from the stationary contact.

[0005] In some embodiments, the third part comprises a side wall between the tripping assembly and the operating mechanism, and a through hole penetrating through the side wall in the first direction, and part of the tripping assembly can enter the accommodation space through the through hole and drive the locking mechanism to move.

[0006] In some embodiments, the tripping assembly comprises a driving piece and a pushing piece, the driving piece being used to drive the pushing piece to move, so that at least part of the pushing piece enters the accommodation space.

[0007] In some embodiments, the pushing piece comprises a conducting part and a pushing part connected to each other, and the driving piece drives the pushing part to move through the conducting part.

[0008] In some embodiments, the conducting part includes a first sub-part clamped between the pushing part and the driving member, and a second sub-part located on one side of the pushing part in the second direction, the second sub-part being slidingly connected to the through hole; wherein the second sub-part is overlapped with the through hole in the orthographic projection of the side wall.

[0009] In some embodiments, the first sub-part is at least partially located outside the through hole in the orthographic projection of the side wall.

[0010] In some embodiments, the circuit breaker further includes an arc extinguishing system arranged on the side of the moving contact away from the rotating mechanism in the second direction.

[0011] In some embodiments, the arc extinguishing system is located in the first part and the second part.

[0012] In some embodiments, the circuit breaker further includes a gas passage arranged in the second part and the third part, the trip assembly being communicated with the arc extinguishing system through the gas passage, and the gas in the gas passage being capable of driving the trip assembly to move so as to drive the moving contact away from the static contact.

[0013] In some embodiments, in the second direction, the trip assembly and the outlet of the gas passage are located on the side of the arc extinguishing system facing the rotating mechanism.

[0014] In some embodiments, the circuit breaker further includes a plurality of deionization devices, the plurality of deionization devices being arranged at intervals in the gas passage.

[0015] In some embodiments, the third part includes a containing part communicated with the outside, the containing part being provided with a wiring terminal, and the outlet of the gas passage being communicated with the containing part.

[0016] In some embodiments, the circuit breaker further includes a limiting member arranged on the movement path of the locking mechanism to limit the movement distance of the locking mechanism.

[0017] In the circuit breaker provided by the embodiments of the present application, the circuit breaker includes a housing, a rotating mechanism, an operating mechanism, a locking mechanism and a trip assembly, etc., the locking mechanism and the operating mechanism are arranged in a containing space, wherein the containing space is outside the housing, and the locking mechanism is connected with the operating mechanism; the rest of the mechanisms are arranged in the housing. When the circuit breaker needs to be tripped due to abnormal current, the trip assembly drives the locking mechanism to move to release the locking, so that the moving contact and the static contact are separated to complete the tripping. The trip assembly of the present application is arranged in the third part of the housing, the locking mechanism is arranged in the containing space outside the housing and connected with the trip assembly, so that when the circuit breaker needs to be tripped, the trip assembly does not need to be directly contacted with the locking mechanism by opening the housing, the air tightness in the housing can be maintained, and thus the arc extinguishing effect and the breaking capacity of the circuit breaker can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Other features, objects, and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments thereof, when read in conjunction with the accompanying drawings, in which like or similar reference numerals designate like or similar features.

[0019] Figure 1 is a structural schematic view of a shell provided by an embodiment of the application;

[0020] Figure 2 is a three-dimensional structural schematic view of a circuit breaker provided by an embodiment of the application;

[0021] Figure 3 is a structural schematic view of an operating mechanism and a locking mechanism provided by an embodiment of the application;

[0022] Figure 4 is a three-dimensional structural schematic view of a shell provided by an embodiment of the application;

[0023] Figure 5 is Figure 4 is an enlarged structural schematic view of part A in

[0024] Figure 6 is a structural schematic view of a trip assembly provided by an embodiment of the application;

[0025] Figure 7 is a structural schematic view of a pusher provided by an embodiment of the application;

[0026] Figure 8 is a structural schematic view of a circuit breaker provided by an embodiment of the application.

[0027] Legend of reference signs:

[0028] 100, circuit breaker; X, first direction; Y, second direction;

[0029] 1, shell; 11, first part; 12, second part; 13, third part; 131, side wall; 132, through hole; 14, accommodation space; 15, movable contact; 16, stationary contact; 17, accommodation portion; 171, wiring terminal;

[0030] 2, rotating mechanism; 21, rotating wheel;

[0031] 3, operating mechanism; 31, upper connecting rod; 32, main elastic member; 33, lower connecting rod; 34, operating handle; 35, operating frame;

[0032] 4, locking mechanism; 41, first locking member; 42, second locking member; 43, third locking member; 44, fourth locking member; 45, limiting member;

[0033] 5, tripping assembly; 51, driving member; 511, bimetallic adjusting nut; 512, bimetallic strip; 513, moving iron; 514, stationary iron; 52, pushing member; 521, conducting part; 521a, first subpart; 521b, second subpart; 522, pushing part;

[0034] 6, arc extinguishing system; 61, arc extinguishing chamber;

[0035] 7, gas passage; 71, gas elimination device. DETAILED DESCRIPTION

[0036] Features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without some or all of these specific details. The description of the embodiments is merely illustrative of the present application and is not intended to limit the present application, as is apparent to one of ordinary skill in the art. In the following description, well-known structures and techniques have not been shown in detail in order not to obscure the present application.

[0037] In the description of the present application, it is to be noted that, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer" and the like is for the purpose of facilitating description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present application. In addition, the terms "first", "second", and the like are used only for the purpose of description and should not be construed as indicating or implying relative importance.

[0038] The orientation words appearing in the following description are the directions shown in the drawings, and do not limit the specific structure of the embodiments of the present application. In the description of the present application, it is to be noted that, unless otherwise specified and limited, the terms "mounting", "connecting" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be directly connected, or indirectly connected. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] At present, in the prior art, the common single-break plastic shell circuit breaker has the structure that the operating mechanism, the locking mechanism, the rotating mechanism and the arc extinguishing system are arranged in the same cavity. When a circuit fault occurs and needs to be tripped, the shell needs to be opened so that the tripping device directly contacts the lock catch, which seriously affects the air tightness in the shell. Therefore, when the arc gas needs to be discharged, the arc particles can enter the gap of the shell, and the arc particles can adhere to the operating mechanism and the rotating mechanism to burn the operating mechanism or the rotating shaft. In the case of a large short-circuit current, the burning phenomenon is more serious. In the worst case, the arc particles can enter the thermal magnetic tripping device, causing the circuit breaker to lose the basic on-off capability.

[0040] To solve the above problems, the embodiments of the present application provide a circuit breaker 100, which will be described below in combination with the drawings.

[0041] Referring to Figures 1 to 3 , Figure 1 is a structural schematic diagram of a shell provided by the embodiments of the present application; Figure 2 is a three-dimensional structural schematic diagram of a circuit breaker provided by the embodiments of the present application; Figure 3 is a structural schematic diagram of an operating mechanism and a locking mechanism provided by the embodiments of the present application.

[0042] As Figures 1 to 3 shown, the first aspect of the present application provides a circuit breaker 100, which includes a shell 1, a rotating mechanism 2, an operating mechanism 3, a locking mechanism 4 and a tripping assembly 5. The shell 1 includes a first part 11, a second part 12 and a third part 13 arranged in sequence in a first direction X. The interiors of the first part 11, the second part 12 and the third part 13 are in communication with each other. The height of the second part 12 in a second direction Y is less than the heights of the first part 11 and the third part 13 in the second direction Y, so that the first part 11, the second part 12 and the third part 13 form a containing space 14 outside the shell 1. The first direction X intersects the second direction Y. The rotating mechanism 2 is rotationally connected to the first part 11. The operating mechanism 3 is arranged in the containing space 14 and connected to the rotating mechanism 2, and is used to drive a moving contact 15 connected to the rotating mechanism 2 to move away from or close to a stationary contact 16. The locking mechanism 4 is arranged in the containing space 14 and drives the moving contact 15 to move through the operating mechanism 3. The tripping assembly 5 is arranged in the third part 13 and is configured to drive the locking mechanism 4 to move when the current in the circuit breaker 100 is abnormal, so as to drive the moving contact 15 to move away from the stationary contact 16.

[0043] In the embodiment of the present application, the first direction X and the second direction Y intersect at an angle, which is not limited in the present application, as long as the two directions are not coincident or parallel. Hereinafter, the first direction X is taken as the horizontal direction, and the second direction Y is taken as the vertical direction, and the case 1 includes opposite top and bottom parts, wherein the accommodating space 14 is an external space formed by the case 1 being recessed towards the bottom part, the operating mechanism 3 and the locking mechanism 4 are arranged in the accommodating space 14, the tripping assembly 5 is located on the top of the third part 13, and the rotating mechanism 2 is located on the top of the first part 11. The tripping assembly 5, the locking mechanism 4, the operating mechanism 3 and the rotating mechanism 2 are sequentially arranged along the first direction X and located at the same height. This arrangement can ensure that the circuit breaker 100 quickly reacts in series when it needs to be disconnected, so as to quickly trip the circuit breaker 100 in the case of abnormal current, thereby improving the breaking capacity of the circuit breaker 100.

[0044] The case 1 can be recessed downwards along the second direction Y to form the accommodating space 14, and the accommodating space 14 is separated from the entire internal space of the case 1, thereby reducing the risk of arc particles adhering to the operating mechanism 3 and the locking mechanism 4, and ensuring the breaking effect of the circuit breaker 100. Meanwhile, the entire case 1 has a concave structure, and the case 1 has a plurality of hollow cavities which are in communication with each other. This arrangement can ensure the airtightness of the case 1 and better guide the flow direction of the internal airflow, which is conducive to improving the arc extinguishing effect of the circuit breaker 100.

[0045] Optionally, in the embodiment of the present application, the rotating mechanism 2 includes a rotating wheel 21 which is rotatably connected to the case 1, and the movable contact 15 is located on the rotating wheel 21 and can move synchronously with the rotating wheel 21. The movable contact 15 is used in cooperation with the static contact 16. When the movable contact 15 combines with the static contact 16, the circuit breaker 100 is in a connected state, i.e. a closed state. When the movable contact 15 is separated from the static contact 16, the circuit breaker 100 is in a disconnected state, i.e. an open state.

[0046] As Figure 3As shown, the operating mechanism 3 can be arranged in various ways. In the embodiments of the present application, a four-bar linkage mechanism is taken as an example for illustration. The operating mechanism 3 is detachably connected to the housing 1 for subsequent maintenance and replacement. The operating mechanism 3 includes an upper link 31, a lower link 33, and a main elastic member 32. The upper link 31 and the lower link 33 are rotatably connected by a rotating shaft (not shown in the figure). One end of the main elastic member 32 is connected to the rotating shaft, and the other end is connected to an operating handle 34 through an operating frame 35. The end of the main elastic member 32 connected to the operating handle 34 is used to receive external force, and the other end is used to apply tension to the rotating shaft and drive the rotating shaft to move. The rotating shaft can be fixedly connected to the upper link 31, fixedly connected to the lower link 33, or rotatably connected to both the upper link 31 and the lower link 33. The present application does not limit this. One end of the lower link 33 is connected to the upper link 31, and the other end is connected to the rotating wheel 21. The lower link 33 and the rotating wheel 21 can be connected in various ways, such as through a pin shaft. This arrangement can maintain the air tightness of the housing 1 while transmitting power from the lower link 33 to the rotating wheel 21. The lower link 33 and the rotating wheel 21 can also be connected by a hinge. This connection facilitates subsequent maintenance and replacement. Those skilled in the art will readily understand that the present application does not limit the connection between the lower link 33 and the rotating wheel 21, as long as the connection can transmit power.

[0047] When the circuit breaker 100 needs to be closed or opened, the operating personnel can operate the operating handle 34 to transmit power to the main elastic member 32, which in turn transmits power to the rotating shaft. The rotating shaft drives the upper link 31 to move, and the upper link 31 drives the lower link 33 to move together, causing the rotating wheel 21 to rotate, so that the movable contact 15 moves away from or approaches the stationary contact 16, realizing the switching between the connected state and the disconnected state of the circuit breaker 100. Of course, those skilled in the art will readily understand that the present application does not limit the arrangement of the operating mechanism 3. The operating mechanism 3 can also be connected by gear transmission or a three-bar linkage or a two-bar linkage. The present application does not limit the specific arrangement of the operating mechanism 3, as long as it can transmit power.

[0048] In some optional embodiments, when the circuit breaker 100 is in the connected state, the locking mechanism 4 is in the locked state, and the movable contact 15 and the stationary contact 16 are in contact with each other. When the circuit breaker 100 fails, the trip assembly 5 can act on the locking mechanism 4 to switch the locking mechanism 4 from the locked state to the unlocked state. The locking mechanism 4 then transmits power to the rotating mechanism 2 through the operating mechanism 3 described above, separates the movable contact 15 from the stationary contact 16, and the circuit breaker 100 is disconnected at this time, protecting the safety of the circuit.

[0049] The locking mechanism 4 can be arranged in various ways. In the embodiment of the present application, a four-stage locking mechanism is taken as an example for illustration. It should be understood by those skilled in the art that the locking mechanism 4 can also be a two-stage locking mechanism, a three-stage locking mechanism, a five-stage locking mechanism, etc. The present application is not limited thereto. The locking mechanism 4 comprises a first locking member 41, a second locking member 42, a third locking member 43 and a fourth locking member 44. The first locking member 41 and the second locking member 42 are locked to each other, the second locking member 42 and the third locking member 43 are locked to each other, and the third locking member 43 and the fourth locking member 44 are locked to each other. The four locking members together form three locking mechanisms. One end of the first locking member 41 is connected to the tripping assembly 5. When the circuit breaker 100 encounters an abnormal current, the tripping assembly 5 can act on the first locking member 41, and a chain reaction occurs between the locking members. The fourth locking member 44 is connected to the operating mechanism 3. After the chain reaction of the locking mechanism 4, the fourth locking member 44 triggers the main elastic member 32, drives the upper link 31 and the lower link 33 to move, and finally drives the rotating wheel 21 to rotate to separate the movable contact 15 from the static contact 16, thereby completing the opening process of the circuit breaker 100. Compared with the conventional circuit breaker 100 having one locking mechanism, the locking mechanism 4 provided in the embodiment of the present application has a more secure and stable locking effect, and further improves the breaking capacity of the circuit breaker 100.

[0050] The tripping assembly 5 can be arranged in various ways. For example, the tripping assembly 5 can be arranged in the form of a moving member and a tripper. In the case of normal current, there is a certain gap between the moving member and the locking mechanism 4. The gap can be adjusted according to different overcurrent multiples of rated current to obtain overcurrent tripping under different rated currents. In the case of abnormal current, the tripper can sense the abnormal current and control the moving member to move and act on the locking mechanism 4, thereby finally separating the movable contact 15 from the static contact 16. The tripping assembly 5 can also be controlled by an electromagnetic valve. This arrangement can realize intelligent automation and has a more sensitive response. The arrangement of the tripping assembly 5 is not limited in the present application, as long as it can drive the locking mechanism 4 to move to drive the movable contact 15 away from the static contact 16 when the circuit breaker 100 encounters an abnormal current.

[0051] In the circuit breaker 100 provided by the embodiments of the present application, the circuit breaker 100 comprises a housing 1, a rotating mechanism 2, an operating mechanism 3, a locking mechanism 4 and a tripping assembly 5, etc., the locking mechanism 4 and the operating mechanism 3 are arranged in a containing space 14, the containing space 14 is outside the housing 1, the locking mechanism 4 is connected with the operating mechanism 3; the rest mechanisms are in the housing 1. When the circuit breaker 100 needs to be tripped to disconnect due to abnormal current, the tripping assembly 5 drives the locking mechanism 4 to move to release the locking, so that the moving contact 15 is separated from the static contact 16 to complete the disconnection. The tripping assembly 5 of the present application is arranged in the third part 13 of the housing 1, the locking mechanism 4 is arranged in the containing space 14 outside the housing 1 and connected with the tripping assembly 5, so that the circuit breaker 100 does not need to be opened to directly contact the tripping assembly 5 with the locking mechanism 4 when disconnection is needed, the air tightness in the housing 1 can be maintained, and thus the arc extinguishing effect and the breaking capacity of the circuit breaker 100 can be improved.

[0052] With reference to Figure 4 and Figure 5 , Figure 4 is a schematic structural view of a housing provided by the embodiments of the present application; Figure 5 is Figure 4 is an enlarged structural view of part A in

[0053] As shown in Figure 4 and Figure 5 , in some optional embodiments, the third part 13 comprises a side wall 131 between the tripping assembly 5 and the operating mechanism 3, and a through hole 132 penetrating through the side wall 131 in the first direction X, part of the tripping assembly 5 can pass through the through hole 132 to enter the containing space 14 and drive the locking mechanism 4 to move.

[0054] In these optional embodiments, the through hole 132 is located at the top of the third part 13 and close to one side of the locking mechanism 4, the through hole 132 is at the same height as the locking mechanism 4, and the through hole 132 is aligned with the locking mechanism 4 in the first direction X, so that the part hit by the tripping assembly 5 can quickly pass through the through hole 132 to hit the locking mechanism 4 in the case of abnormal current of the circuit breaker 100, so as to trigger the locking mechanism 4 to switch to the unlocking state, and finally transmit to the rotating mechanism 2 to drive the moving contact 15 and the static contact 16 to separate to complete the switching of the circuit breaker 100 to the disconnected state, so as to realize the effect of quick disconnection of the circuit breaker 100. When it is needed to switch the circuit breaker 100 to the connected state again, the operator can operate the operating handle 34 to drive the locking mechanism 4 to move to switch back to the locking state, and the locking mechanism 4 will contact the tripping assembly 5, so that the tripping assembly 5 can be driven by the locking mechanism 4 to pass through the through hole 132 again to reset to the initial state

[0055] With reference to Figure 6 ,Figure 6 This is a schematic diagram of the structure of a tripping component provided in an embodiment of this application.

[0056] like Figure 6 As shown, in some optional embodiments, the tripping assembly 5 includes a drive member 51 and a pusher member 52, the drive member 51 being used to drive the pusher member 52 to move such that at least a portion of the pusher member 52 enters the receiving space 14.

[0057] In these optional embodiments, the driving component 51 can be configured in various ways. For example, the driving component 51 can be configured as a bimetallic adjusting nut 511, on which bimetallic strips 512 are provided. The bimetallic strips 512 are spaced apart, and the coefficient of thermal expansion of the left metal strip along the first direction X is greater than that of the right metal strip. The bimetallic strips 512 can also be spaced apart by changing the preset interval to handle abnormal situations under different multiples of rated current. When an abnormal current occurs, the metal strips will deform due to heat. Since the coefficient of thermal expansion of the left metal strip is greater than that of the right metal strip, the bimetallic strip 512 will deform to the right, thereby driving the bimetallic strip 512. The pusher 52 passes through the through hole 132 and strikes the locking mechanism 4, ultimately transmitting power to the rotating mechanism 2 to separate the moving contact 15 from the stationary contact 16, completing the tripping process. The drive 51 can also be an electromagnetic mechanism in the form of a moving iron plate 513 and a stationary iron plate 514. When an abnormal current occurs, the electromagnetic mechanism reacts, driving the moving iron plate 513 to strike the pusher 52. Under the impact force, the pusher 52 passes through the through hole 132 and strikes the locking mechanism 4, ultimately transmitting power to the rotating mechanism 2 to separate the moving contact 15 from the stationary contact 16, completing the tripping process. The electromagnetic mechanism can handle large-multiplier abnormal currents, such as short-circuit circuits, to achieve rapid tripping. It is readily understood by those skilled in the art that the drive 51 of this application can be used individually or in combination with the aforementioned dual-metal or electromagnetic mechanisms to adapt to different abnormal current conditions; the specific configuration of the drive 51 is not limited.

[0058] In this embodiment, the driving member 51, the pushing member 52, the through hole 132, and the locking mechanism 4 are arranged sequentially along the first direction X and at the same height. The pushing member 52 and the housing 1 are fitted with a small gap. This arrangement can ensure the correct airflow direction in the housing 1 and the airtightness between the various parts in the housing 1. On the other hand, it can ensure that in the event of an abnormal current, the pushing member 52 and the locking mechanism 4 can form an interactive cooperation, and the pushing member 52 can quickly pass through the through hole 132 to strike the locking mechanism 4, thereby achieving the purpose of rapid tripping and opening.

[0059] See also Figure 7 , Figure 7Fig. 1 is a structural schematic diagram of a pusher according to an embodiment of the present application.

[0060] As shown in Fig. 1, in some optional embodiments, the pusher 52 comprises a conducting portion 521 and a pushing portion 522 connected with each other, and the driving member 51 drives the pushing portion 522 to move through the conducting portion 521. Figure 7 In these optional embodiments, the conducting portion 521 and the pushing portion 522 are sequentially arranged along the first direction X, the pushing portion 522 protrudes from the conducting portion 521, and the pushing portion 522 is formed into a pointed end at one end close to the through hole 132. When the current is abnormal, the driving member 51 can push the conducting portion 521 to drive the pushing portion 522 to move, and the pointed end can pass through the through hole 132 to hit the locking mechanism 4 to trigger a chain reaction of the locking mechanism 4, so as to finally drive the moving contact 15 and the static contact 16 to separate, thereby achieving the tripping and opening. The conducting portion 521 can buffer the power generated when the pushing portion 522 is rapidly hit, thereby increasing the stability of the pusher 52, and can also ensure the air tightness in the shell 1, thereby improving the arc extinguishing effect.

[0061] In some optional embodiments, the conducting portion 521 comprises a first sub-portion 521a clamped between the pushing portion 522 and the driving member 51, and a second sub-portion 521b located on one side of the pushing portion 522 in the second direction Y, and the second sub-portion 521b is slidingly connected to the through hole 132; wherein the second sub-portion 521b overlaps the through hole 132 in the orthographic projection of the side wall 131.

[0062]

[0063] ​In these optional embodiments, the conducting portion 521 can be made in an "L" shape, the first sub-portion 521a extends along the second direction Y, the second sub-portion 521b extends along the first direction X, and the pushing portion 522 protrudes from the first sub-portion 521a towards the through hole 132 along the first direction X and is clamped between the first sub-portion 521a and the second sub-portion 521b. In this way, the entire pushing member 52 can be kept stable and interference dislocation of the pushing member 52 during movement can be prevented, so that the pushing member 52 cannot be tripped. Alternatively, in the embodiments of the present application, a slide rail is arranged at the position where the side wall 131 and the second sub-portion 521b move, and the second sub-portion 521b is slidably connected to the side wall 131. On the one hand, the friction between the first sub-portion 521a and the shell 1 can be reduced, and the smoothness of movement of the pushing member 52 can be increased. On the other hand, the slide rail can also support the pushing portion 522. On the other hand, the slide rail can prevent the airflow from the bottom from being blown back, prevent the pushing member 52 from interfering, and prevent the pushing portion 522 from being dislocated or even unable to be tripped from the through hole 132. Those skilled in the art can easily understand that the specific arrangement of the conducting portion 521 is not limited to this, as long as the pushing portion 522 can smoothly pass through the through hole 132. The specific arrangement is not limited in the present application. The orthographic projection of the second sub-portion 521b on the side wall 131 overlaps the through hole 132, so that the cross section of the second sub-portion 521b matches the shape of the through hole 132. When tripping and opening the circuit, the air tightness in the shell 1 is increased, and the arc extinguishing effect in the circuit breaker 100 is ensured.

[0064] In some optional embodiments, the orthographic projection of the first sub-portion 521a on the side wall 131 is at least partially located outside the through hole 132. In these optional embodiments, the orthographic projection of the first sub-portion 521a on the side wall 131 is at least partially located outside the through hole 132, so that when tripping and opening the circuit, the entire pushing member 52 will not directly move out of the through hole 132 and fall out of the shell 1. The pushing member 52 will be stuck on the shell 1. In this way, the distance of movement of the pushing member 52 can be limited, and the pushing member 52 will not fall out of the through hole 132, so as to affect the tripping effect.

[0065] For reference Figure 8 , Figure 8 is a structural schematic diagram of a circuit breaker provided in the embodiments of the present application.

[0066] In some optional embodiments, the circuit breaker 100 further comprises an arc extinguishing system 6 arranged on the side of the movable contact 15 away from the rotating mechanism 2 along the second direction Y.

[0067] In the embodiments of the present application, the arc extinguishing system 6 comprises an arc extinguishing chamber 61, which is located at the bottom of the housing 1, and the moving contact 15 is located between the rotating wheel 21 and the arc extinguishing chamber 61. At the moment of opening of the circuit breaker 100, due to the existence of the capacitance between the moving contact 15 and the static contact 16, the insulation between the contacts is broken and an arc is generated. The existence of the arc not only expands the overall failure degree of the circuit system, but also causes damage to the contacts. Therefore, the circuit breaker 100 needs to be provided with the arc extinguishing system 6 for reducing the burning loss of the contacts caused by the arc and limiting the space of the arc expansion.

[0068] In some optional embodiments, the arc extinguishing system 6 is located in the first part 11 and the second part 12. In these optional embodiments, the arc extinguishing chamber 61 is also arranged at the bottom of the first part 11 and the second part 12 and is arranged transversely along the first direction X, so that the volume of the entire arc extinguishing chamber 61 is larger and can accommodate more fins, thereby improving the arc extinguishing effect of the arc extinguishing system 6 and also improving the reliability of the breaking of the moving contact 15 and the static contact 16.

[0069] In some optional embodiments, the circuit breaker 100 further comprises a gas passage 7 arranged in the second part 12 and the third part 13, and the trip assembly 5 is in communication with the arc extinguishing system 6 through the gas passage 7. The gas in the gas passage 7 can drive the trip assembly 5 to move, so that the moving contact 15 moves away from the static contact 16.

[0070] In the embodiments of the present application, the gas passage 7 leads from the bottom of the housing 1 to the top of the housing 1, and the gas rises from bottom to top. Compared with the traditional circuit breaker 100, the gas in the gas passage 7 moves left and right. The gas passage 7 of the present application is longer, which can enhance the cooling effect in the gas passage 7, thereby better cooling the gas, so that the arc disappears, and the arc cannot enter other components such as the trip assembly 5 through the gas passage 7 to cause burning of the components and thus affect the breaking capacity of the circuit breaker 100. Moreover, the arrangement of the gas passage 7 can form a strong gas flow in the gas passage 7 in the case of abnormal current when the driving member 51 fails or delays triggering, so that a high-pressure area is formed in the area of the trip assembly 5 to generate high-pressure gas. The high-pressure gas can push the first part 521a, so that the pushing part 522 passes through the through hole 132 and hits the locking mechanism 4, so as to finally separate the moving contact 15 from the static contact 16, thereby achieving the purpose of rapid tripping and opening. In the case of no abnormal current, no strong gas flow is generated in the gas passage 7, so the driving member 52 remains stationary and does not hit the locking mechanism 4, thereby not affecting the locking state of the locking mechanism 4. The movement flow direction of the gas in the gas passage 7 is shown by the arrow mark. Figure 8

[0071] ​In some alternative embodiments, the trip unit 5 and the outlet of the gas passage 7 are located on the side of the arc extinguishing system 6 facing the rotating mechanism 2 in the second direction Y. In these alternative embodiments, the outlet of the gas passage 7 is arranged on the top of the housing 1 and faces away from the trip unit 5. This arrangement has two advantages. On the one hand, the gas rises from bottom to top, and the gas has a longer flow path, so that the gas is cooled better and more arcs are extinguished. On the other hand, in the case of failure or delay of the drive 51 and abnormal current of the circuit breaker 100, the gas flow pushes the first part 521a instead of the second part 521b, and then hits the locking mechanism 4 to complete the tripping process.

[0072] In some alternative embodiments, the circuit breaker 100 further comprises a plurality of deionization devices 71 arranged in the gas passage 7. In these alternative embodiments, the gaps of the deionization devices 71 gradually become smaller and denser along the direction of the gas flow in the gas passage 7. This arrangement can better cool the gas in the gas passage 7 and enhance the cooling effect in the gas passage 7, so that zero arc in the gas passage 7 can be achieved. Alternatively, the deionization device 71 can be a wire-cut integrated part, which is convenient to process. It is easy for those skilled in the art to understand that the hole type and mesh type of the deionization device 71 of the present application are not limited, as long as the gas in the gas passage 7 can be cooled, and the specific shape and number are not limited.

[0073] Continuing to refer to Figure 8 In some alternative embodiments, the third part 13 comprises a containing portion 17 communicating with the outside, and the containing portion 17 is provided with a wiring terminal 171. The outlet of the gas passage 7 communicates with the containing portion 17. Alternatively, the containing portion 17 can be provided with through holes on the top wall and the side wall, and the wires are connected to the wiring terminal 171 through the through holes. The containing portion 17 is separated from the other parts in the housing 1, so that the wires do not affect the normal operation of the internal mechanisms of the circuit breaker 100. In these alternative embodiments, the containing portion 17 is arranged on the third part 13 and communicates with the outside. On the one hand, the gas in the gas passage 7 can go out of the containing portion 17, so as not to affect the normal operation of the internal mechanisms of the circuit breaker 100 and increase the air tightness in the housing 1. On the other hand, the gas can go out of the outlet of the containing portion 17 to push the drive 52 to hit the locking mechanism 4 to achieve the purpose of tripping. The shape and size of the containing portion 17 are not limited in the present application.

[0074] In some optional embodiments, the circuit breaker 100 further comprises a limiting member 45 arranged on the movement path of the locking mechanism 4 to limit the moving distance of the locking mechanism 4. Optionally, the limiting member 45 is arranged in the moving direction of the first locking member 41 to limit the maximum moving distance of the first locking member 41, preventing the first locking member 41 from tripping and affecting the breaking effect of the circuit breaker 100.

[0075] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to the application without departing from the scope thereof. In particular, the technical features mentioned in each of the embodiments can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A circuit breaker characterized by, The circuit breaker comprises: a housing comprising a first part, a second part and a third part arranged in sequence in a first direction, interiors of the first part, the second part and the third part being in communication with each other, a height of the second part in a second direction being less than heights of the first part and the third part in the second direction, so that the first part, the second part and the third part form a containing space in a half-enclosure manner outside the housing, the third part comprising a side wall between the trip assembly and the operating mechanism, and a through hole penetrating through the side wall in the first direction, a part of the trip assembly being capable of entering the containing space through the through hole and driving the locking mechanism to move, the first direction intersecting the second direction; a rotating mechanism rotatably connected in the first part; an operating mechanism arranged in the containing space and connected to the rotating mechanism, for driving a moving contact connected to the rotating mechanism to move away from or close to a stationary contact; a locking mechanism arranged in the containing space, the locking mechanism being driven by the operating mechanism to move the moving contact; a trip assembly arranged in the third part, the trip assembly being configured to drive the locking mechanism to move when an abnormal current in the circuit breaker, so as to drive the moving contact to move away from the stationary contact, the trip assembly comprising a driving member and a pushing member, the driving member being used to drive the pushing member to move, so that at least a part of the pushing member enters the containing space, the pushing member comprising a conducting part and a pushing part connected to each other, the driving member driving the pushing part to move through the conducting part, the conducting part comprising a first part arranged between the pushing part and the driving member, and a second part arranged on one side of the pushing part in the second direction, the second part being slidably connected to the through hole; wherein a projection of the second part on the side wall overlaps the through hole.

2. The circuit breaker of claim 1, wherein A projection of the first part on the side wall is at least partially located outside the through hole.

3. The circuit breaker of claim 1, wherein, Further comprising an arc extinguishing system arranged on a side of the moving contact away from the rotating mechanism in the second direction.

4. The circuit breaker of claim 3, wherein, The arc extinguishing system is located in the first part and the second part.

5. The circuit breaker of claim 3 or 4, wherein, Further comprising a gas passage arranged in the second part and the third part, the trip assembly being in communication with the arc extinguishing system through the gas passage, gas in the gas passage being capable of driving the trip assembly to move, so that the moving contact moves away from the stationary contact.

6. The circuit breaker of claim 5, wherein, In the second direction, the trip assembly and an outlet of the gas passage are located on a side of the arc extinguishing system facing the rotating mechanism.

7. The circuit breaker of claim 6, wherein, Further comprising a plurality of ionization elimination devices, the plurality of ionization elimination devices being arranged at intervals in the gas passage.

8. The circuit breaker of claim 5, wherein, The third part comprises a containing part in communication with the outside, the containing part being provided with a terminal, and the outlet of the gas passage is in communication with the containing part.

9. The circuit breaker of claim 1, wherein, Further comprising a limiting member arranged on a movement path of the locking mechanism to limit a movement distance of the locking mechanism.

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