Circuit breaker

Abstract

The invention provides a circuit breaker, relates to the technical field of switches, and is used for improving the capability of cutting off the current of a circuit where the circuit breaker is located, improving the power utilization safety and improving the contact stability of a moving contact and a static contact when the circuit where the circuit breaker is located is abnormal. The circuit breaker comprises a shell, two static contacts, a moving contact, a pushing mechanism and a first elastic piece, the moving contact has a contact position and a separation position relative to the shell, when the moving contact is in the contact position, the two contact ends make contact with the corresponding static contacts at the same time, and the circuit breaker is in a closed state. And when the moving contact is in the separation position, the two contact ends are separated from the corresponding static contacts at the same time, and the circuit breaker is in a disconnected state. The pushing mechanism is provided with a contact support and is used for driving the moving contact to be switched between the contact position and the separation position. And the first elastic piece is used for applying an acting force to the two contact ends when the moving contact is in the contact position, wherein the acting force approaches to the corresponding static contact.

Description

Technical Field

[0001] The present application relates to the field of switch technology, and in particular to a circuit breaker. Background Art

[0002] A circuit breaker is an electrical device that can control the on and off of current. A circuit breaker generally includes a static contact, a moving contact, and a handle. When the static contact and the moving contact are in contact, the current in the circuit where the circuit breaker is located is connected. When the operator operates the handle or an abnormal situation occurs in the circuit where the circuit breaker is located, the static contact and the moving contact are disconnected, and the current in the circuit where the circuit breaker is located is disconnected.

[0003] In the prior art, when an abnormal situation occurs in the circuit where the circuit breaker is located, the ability to cut off the current in the circuit where the circuit breaker is located is poor, which reduces the safety of electricity use. In addition, the circuit breaker in the prior art has poor stability when the static contact and the moving contact are in contact. Summary of the invention

[0004] The present application provides a circuit breaker for improving the ability to cut off the current in the circuit where the circuit breaker is located when an abnormal situation occurs in the circuit where the circuit breaker is located, thereby improving the safety of electricity use and, at the same time, improving the contact stability between a moving contact and a static contact.

[0005] The present application provides a circuit breaker, comprising a housing, two stationary contacts, a moving contact, a pushing mechanism and a first elastic member, wherein the two stationary contacts are arranged in the housing. The moving contact is rotatably arranged in the housing, and the moving contact has two contact ends respectively used to contact the two stationary contacts. The moving contact has a contact position and a separation position relative to the housing, and when the moving contact is in the contact position, the two contact ends are in contact with the corresponding stationary contacts at the same time, and the circuit breaker is in a closed state; when the moving contact is in the separation position, the two contact ends are out of contact with the corresponding stationary contacts at the same time, and the circuit breaker is in an open state. The pushing mechanism is arranged in the housing, and the pushing mechanism has a contact support, and the contact support is rotatably arranged in the housing. The moving contact is movably arranged on the contact support, and the pushing mechanism is used to drive the moving contact to switch between the contact position and the separation position. The two ends of the first elastic member elastically act on the contact support and the moving contact respectively, and the first elastic member is used to apply a force to the two contact ends to approach the corresponding stationary contact when the moving contact is in the contact position.

[0006] When the above technical solution is adopted, when an abnormal phenomenon occurs in the circuit where the circuit breaker is located, under the action of the electric repulsion, the two contact ends are simultaneously disconnected from the corresponding static contacts. At this time, the circuit breaker switches from the closed state to the open state. At the moment when the two contact ends are simultaneously disconnected from the corresponding static contacts, the arc voltage generated is relatively large, forcing the arc to extinguish quickly, which can greatly improve the current limiting effect, effectively improve the breaking capacity, and enhance the safety of electricity use.

[0007] When the moving contact is in the contact position, the moving contact is subjected to the force from the first elastic member, which can ensure that the two contact ends are in close contact with the corresponding static contacts, thereby avoiding unstable contact between the moving contact and the static contact, which leads to increased contact resistance, and subsequently causes problems such as increased temperature rise and decreased product performance.

[0008] In a possible implementation, a through opening is provided on one side of the shell. The pushing mechanism also includes a handle and a connecting rod, the handle includes a handle body and a gripping portion connected to each other, and the handle body is rotatably arranged on the shell. An end of the gripping portion away from the handle body extends out of the shell through the through opening. The handle has an open position and a closed position relative to the shell, and when the handle is in the open position, the moving contact is in the separated position. When the handle is in the closed position, the moving contact is in the contact position. One end of the connecting rod is rotatably connected to the handle body, and the other end of the connecting rod is rotatably connected to the contact support.

[0009] When the above technical solution is adopted, when the operator holds the gripping part and operates the handle to rotate the handle body relative to the housing, so that the handle switches between the disconnected position and the closed position, the contact support can be synchronously driven to rotate relative to the housing under the action of the connecting rod. The moving contact is movably arranged on the contact support, and the moving contact and the contact support move synchronously, so that the moving contact rotates synchronously relative to the housing. The moving contact is switched between the contact position and the separated position.

[0010] In a possible implementation manner, a first limiting groove is provided on the contact support at a position contacting one end of the first elastic member.

[0011] When the above technical solution is adopted, one end of the first elastic member is limited in the first limiting groove, so as to avoid the phenomenon that one end of the first elastic member slides relative to the contact support, thereby affecting the force of the first elastic member acting on the moving contact and reducing the contact stability between the moving contact and the static contact.

[0012] In a possible implementation manner, a second limiting groove is provided at a position on the moving contact that contacts the other end of the first elastic member.

[0013] When the above technical solution is adopted, the other end of the first elastic member is limited in the second limiting groove, so as to avoid the phenomenon that the other end of the first elastic member slides relative to the moving contact, thereby affecting the force of the first elastic member acting on the moving contact and reducing the contact stability between the moving contact and the static contact.

[0014] In a possible implementation, the two contact ends are respectively a first contact end and a second contact end. The moving contact includes a first rotating arm and a second rotating arm, one end of the first rotating arm is connected to one end of the second rotating arm to form a mounting end of the moving contact. The other end of the first rotating arm is a first contact end, and the other end of the second rotating arm is a second contact end.

[0015] In a possible implementation, the structure of the first rotating arm is a linear plate structure, and the structure of the second rotating arm is an arcuate plate structure, wherein the center of curvature of the arcuate plate structure is located on a side of the arcuate plate structure away from the first contact end.

[0016] When the above technical solution is adopted, the first rotating arm is a linear plate-shaped structure, which is relatively easy to process and form. Moreover, when the moving contact is in the separation position, the first rotating arm is set as a linear plate-shaped structure, which is conducive to ensuring the distance between the first rotating arm and the first static contact. It can ensure that in the process of the handle switching from the closed position to the open position and the moving contact switching from the contact position to the separation position, the arc generated is elongated, and the arc energy is gradually reduced until the arc is disconnected and extinguished, which can improve the reliability of the circuit breaker disconnection.

[0017] In one possible implementation, a first recessed portion, a first protruding portion, and a second recessed portion are provided on one side of the first contact end for contacting the corresponding static contact, and the first recessed portion, the first protruding portion, and the second recessed portion are arranged in sequence from the mounting end to the first contact end, and the first protruding portion is used to contact the corresponding static contact.

[0018] When the above technical solution is adopted, when the moving contact is in the contact position, the first protrusion contacts the corresponding static contact. When the moving contact switches from the contact position to the separation position, the generated arc moves along the first recessed portion and the second recessed portion in a direction away from the first protrusion under the action of the electric repulsive force, which helps to reduce the energy of the arc and extinguish the arc.

[0019] In one possible implementation, a third recessed portion, a second protruding portion, and a fourth recessed portion are provided on one side of the second contact end for contacting the corresponding static contact, and the third recessed portion, the second protruding portion, and the fourth recessed portion are arranged in sequence from the mounting end to the second contact end, and the second protruding portion is used to contact the corresponding static contact.

[0020] When the above technical solution is adopted, when the moving contact is in the contact position, the second protrusion contacts the corresponding static contact. When the moving contact switches from the contact position to the separation position, the generated arc moves along the third recessed portion and the fourth recessed portion in a direction away from the second protrusion under the action of the electric repulsive force, which helps to reduce the energy of the arc and extinguish the arc.

[0021] In a possible implementation, the pushing mechanism further includes a second elastic member, two ends of which elastically act on the contact support and the housing respectively; the second elastic member is used to apply a force to the contact support close to the handle when the handle is in a closed position.

[0022] When the above technical solution is adopted, when the handle is in the closed position, the second elastic member is compressed, one end of the second elastic member is pressed against the inner wall of the shell, and the other end of the second elastic member is pressed against the contact support, and applies a force to the contact support close to the handle.

[0023] When the handle switches from the closed position to the open position, the second elastic member can release energy and exert a force on the contact support close to the handle, so that the push mechanism is quickly reset and the handle switches from the closed position to the open position. At the same time, the moving contact quickly breaks contact with the static contact, the arc is also quickly elongated, and the arc energy is weakened until it is extinguished, so as to achieve the purpose of quickly breaking the arc.

[0024] In a possible implementation, a limiting portion is provided on the housing, and the limiting portion is provided between the handle and the contact support. The limiting portion is used to limit the position of the contact support relative to the handle when the handle is in the disconnected position.

[0025] When the above technical solution is adopted, the handle and the contact support can be isolated, so as to avoid the contact support and the handle being too close or even tightly attached to each other when the handle is in the disconnected position, thereby interfering with the handle when switching from the disconnected position to the closed position.

[0026] In a possible implementation, the stationary contact has an extension portion, which extends from a position of the stationary contact for contacting the moving contact in a direction away from the moving contact, and is a U-shaped extension portion.

[0027] On the one hand, the magnetic field and the electric repulsion acting on the moving contact are enhanced. When an abnormal situation occurs in the circuit where the circuit breaker is located, the moving contact and the static contact can be accelerated to disengage, and the arc is easily elongated, making the arc thinner, and then the arc energy is weakened until it is extinguished. On the other hand, at the moment when the moving contact and the static contact are disengaged, the generated arc will move along the U-shaped extension and be guided to a position away from the static contact, which is conducive to weakening the arc energy until the arc is extinguished. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the structure of a circuit breaker provided in an embodiment of the present application.

[0029] Figure 2 This is a schematic structural diagram of a circuit breaker without a cover provided in an embodiment of the present application.

[0030] Figure 3 A schematic diagram of a first static contact and a U-shaped extension portion provided in an embodiment of the present application.

[0031] Figure 4 A schematic diagram of a second static contact and a U-shaped extension provided in an embodiment of the present application.

[0032] Figure 5 A schematic diagram of a moving contact provided in an embodiment of the present application.

[0033] Figure 6 Schematic diagram of the contact support structure provided in the embodiment of the present application Figure 1 .

[0034] Figure 7 Schematic diagram of the contact support structure provided in the embodiment of the present application Figure 2 .

[0035] Figure 8 Schematic diagram of the first elastic member provided in the embodiment of the present application Figure 1 .

[0036] Fig. 9 Schematic diagram of the first elastic member provided in the embodiment of the present application Figure 2 .

[0037] Fig.10 A schematic diagram of a connecting rod provided in an embodiment of the present application.

[0038] Description of reference numerals:

[0039] 1-shell, 11-base, 12-cover, 13-limiting part;

[0040] 2-static contact, 21-first static contact, 22-second static contact, 23-U-shaped extension;

[0041] 3-moving contact, 31-second limiting groove, 32-first rotating arm, 321-first recessed portion, 322-first protruding portion,

[0042] 323 - second recessed portion, 33 - second rotating arm, 331 - third recessed portion, 332 - second protruding portion, 333 - fourth recessed portion,

[0043] 34-through hole;

[0044] 4-pushing mechanism, 41-handle, 411-handle body, 412-gripping portion, 42-connecting rod, 421-connecting rod, 422-insertion end, 43-contact support, 431-connecting hole, 432-center circular hole, 433-installing groove, 434-limiting groove, 435-first limiting groove, 44-first elastic member, 441-first torsion spring, 442-second torsion spring, 45-second elastic member;

[0045] 5- Rotating axis. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover non-exclusive inclusions.

[0048] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiments" in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0049] The directional words appearing in the following description are all directions shown in the drawings, and do not limit the specific structure of the circuit breaker of the present application. For example, in the description of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present application.

[0050] In addition, the terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0051] In the description of the present application, unless otherwise specified, "plurality" means more than two (including two), and similarly, "multiple groups" means more than two groups (including two).

[0052] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, the "connection" or "connection" of a mechanical structure may refer to a physical connection. For example, the physical connection may be a fixed connection, such as a fixed connection through a barrier, such as a fixed connection through screws, bolts or other barrier; the physical connection may also be a detachable connection, such as a mutual snap-on or snap-fit ​​connection; the physical connection may also be an integral connection, such as a connection formed by welding, bonding or integral molding. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0053] like Figure 1 and Figure 2 As shown, an embodiment of the present application provides a circuit breaker, which includes a housing 1, two stationary contacts 2, a moving contact 3 and a pushing mechanism 4. The two stationary contacts 2 are arranged in the housing 1, and the moving contact 3 has two contact ends respectively used to contact the two stationary contacts 2.

[0054] In a specific implementation, the housing 1 includes a base 11 and a cover 12 that are arranged opposite to each other. Both the base 11 and the cover 12 are shell-like structures with an open accommodation space. The opening of the accommodation space of the base 11 is arranged toward the cover 12, and the opening of the accommodation space of the cover 12 is arranged toward the base 11. The base 11 and the cover 12 are arranged opposite to each other. After the cover 12 is covered on the base 11, the base 11 and the cover 12 are arranged to form an accommodation space of the housing 1. The moving contact 3, the static contact 2, etc. included in the circuit breaker are all arranged in the accommodation space of the housing 1.

[0055] The structure of the housing 1 can be a rectangular parallelepiped structure. In the embodiment provided in this application, for ease of understanding, refer to Figure 1 and Figure 2 As shown, at the same time, Figure 1 and Figure 2 Taking the placement orientation shown as an example, the extension direction of the longer edge on the bottom surface of the shell 1 is defined as the first direction, the extension direction of the shorter edge on the bottom surface of the shell 1 is defined as the second direction, and the height direction of the shell 1 is defined as the third direction. In actual situations, the first direction, the second direction, and the third direction are the X-axis, the Y-axis, and the Z-axis in the three-dimensional space. The first direction, the second direction, and the third direction are perpendicular to each other.

[0056] The two stationary contacts 2 are respectively as follows Figure 3 The first stationary contact 21 shown and Figure 4 The second stationary contact 22 is shown.

[0057] During specific implementation, the specific structures of the first stationary contact 21 and the second stationary contact 22 are not specifically limited here and are subject to actual conditions.

[0058] In actual situations, a first static contact point is fixedly disposed on the first static contact 21, and a second static contact point is fixedly disposed on the second static contact 22. The first static contact point and the second static contact point are used to contact with two contact ends of the moving contact 3, respectively.

[0059] The first stationary contact 21 and the second stationary contact 22 are both fixedly mounted on the housing 1 .

[0060] In specific implementation, the first connection end of the first static contact 21 is fixedly connected to the housing 1, so that the first static contact 21 is fixedly mounted on the housing 1. The second connection end of the second static contact 22 is fixedly connected to the housing 1, so that the second static contact 22 is fixedly mounted on the housing 1.

[0061] In addition, if Figure 2 As shown, the first static contact is located at an end of the first static contact 21 away from the first connection end, and correspondingly, the second static contact is located at an end of the second static contact 22 away from the second connection end.

[0062] In the embodiment provided in the present application, the first connection end and the second connection end are respectively arranged on two opposite side surfaces of the housing 1 .

[0063] Specifically, see Figure 2 As shown, the first connection end and the second connection end are respectively arranged on the side surfaces of the housing 1 located on both sides of the first direction. That is, the distance between the two side surfaces of the housing 1 used to connect with the first connection end and the second connection end is the length of the bottom surface of the housing 1. The vertical distance between the first connection end and the second connection end is equal to the length of the bottom surface of the housing 1. The length of the bottom surface of the housing 1 is greater than the width of the bottom surface of the housing 1, thereby ensuring the distance between the first static contact and the second static contact, effectively reducing the risk of arc breakdown or even short circuit caused by the close distance between the first static contact and the second static contact when an abnormal situation occurs in the circuit where the circuit breaker is located.

[0064] It should be pointed out that if Figure 1 and Figure 2 As shown, in the embodiment provided in the present application, the contact surface of the first static contact for contacting the moving contact 3 is parallel to the second direction and the third direction, and the contact surface of the second static contact for contacting the moving contact 3 is parallel to the first direction and the second direction.

[0065] The specific structures of the first stationary contact 21 and the second stationary contact 22 are not specifically limited here.

[0066] It should be noted that the second static contact 22 has a U-shaped structure, which can enhance the electric repulsion force when an abnormality occurs in the circuit where the circuit breaker is located.

[0067] The moving contact 3 is rotatably disposed in the housing 1 , and the moving contact 3 has a contact position and a separation position relative to the housing 1 .

[0068] Specifically, combined Figure 1 and Figure 2 As shown, a rotating shaft 5 is further provided in the housing 1 , and the axis of the rotating shaft 5 extends along the second direction.

[0069] It should be noted that the second direction is the direction from the base 11 to the cover 12. Two ends of the rotating shaft 5 are respectively disposed on the base 11 and the cover 12.

[0070] In specific implementation, the moving contact 3 has a mounting end, such as Figure 5 As shown, a through hole 34 may be opened on the mounting end of the moving contact 3 , and the rotating shaft 5 passes through the through hole 34 .

[0071] The two ends of the rotating shaft 5 can be fixedly arranged on the base 11 and the cover 12 respectively, that is, the rotating shaft 5 is fixedly arranged on the housing 1. At this time, the moving contact 3 can be rotatably arranged on the rotating shaft 5 to ensure that the moving contact 3 can rotate relative to the housing 1.

[0072] Of course, the two ends of the rotating shaft 5 can also be rotatably arranged on the base 11 and the cover 12 respectively, that is, the rotating shaft 5 can rotate relative to the housing 1. At this time, the moving contact 3 and the rotating shaft 5 can be fixedly connected, or the moving contact 3 can rotate relative to the rotating shaft 5.

[0073] The connection mode between the rotating shaft 5 and the base 11 and the cover 12, and the connection mode between the moving contact 3 and the rotating shaft 5 are not specifically limited here and are subject to actual conditions.

[0074] The axis of the rotating shaft 5 is the rotation axis of the moving contact 3. The moving contact 3 can rotate relative to the housing 1 in a plane formed by the first direction and the third direction with the axis of the rotating shaft 5 as the rotation axis. During the rotation of the moving contact 3 relative to the housing 1, the moving contact 3 has a contact position and a separation position relative to the housing 1.

[0075] When the moving contact 3 is in the contact position, the two contact ends are in contact with the corresponding static contacts 2 at the same time, the circuit breaker is in a closed state, the current in the circuit where the circuit breaker is located is conducted, and the circuit where the circuit breaker is located works normally.

[0076] When the moving contact 3 is in the separated position, the two contact ends are simultaneously out of contact with the corresponding stationary contacts 2, and the circuit breaker is in the disconnected state.

[0077] When an abnormal phenomenon occurs in the circuit where the circuit breaker is located, such as a short circuit or an overload, the two contact ends are simultaneously disconnected from the corresponding static contact 2 under the action of the electric repulsion force. At this time, the circuit breaker switches from the closed state to the open state. At the moment when the two contact ends are simultaneously disconnected from the corresponding static contact 2, the arc voltage generated is relatively large, forcing the arc to extinguish quickly, which can greatly improve the current limiting effect and effectively improve the breaking capacity.

[0078] It should be noted that when the moving contact 3 switches from the separated position to the contact position, the two contact ends contact the corresponding static contacts 2 at the same time. When the circuit breaker is in a closed state, the moving contact 3 and the two static contacts 2 are connected in series in the circuit.

[0079] As can be seen from the above, the circuit breaker provided in the embodiment of the present application includes a moving contact 3 and two stationary contacts 2, the moving contact 3 has two contact ends respectively contacting the two stationary contacts 2, and each stationary contact 2 and the corresponding contact end are called a breakpoint. The circuit breaker provided in the embodiment of the present application has two breakpoints, that is, the circuit breaker provided in the embodiment of the present application is a double breakpoint structure.

[0080] The breaking effect of the circuit breaker with a double breakpoint structure provided in an embodiment of the present application is described below in a possible implementation manner.

[0081] In a single-pole circuit breaker, if a circuit breaker with a single breakpoint structure in the prior art is used, when an abnormal situation occurs in the circuit and the moving contact 3 is out of contact with the static contact 2, one breakpoint breaks the 230V voltage, and the arc energy generated is large, which seriously burns the moving contact 3 and the static contact 2, shortening the service life of the circuit breaker and affecting subsequent use.

[0082] In the circuit breaker with the double breakpoint structure provided by the embodiment of the present application, since the moving contact 3 and the two stationary contacts 2 are connected in series, it is equivalent to dividing the 230V voltage into two 115V. In the process of switching the circuit breaker from the closed state to the open state, one breakpoint is used to break the 115V voltage, which greatly reduces the voltage value that needs to be broken, reduces the arc energy generated when the moving contact 3 is out of contact with the stationary contact 2, reduces the erosion of the moving contact 3 and the stationary contact 2 by the arc, and helps to extend the service life of the circuit breaker.

[0083] Similarly, when a four-pole circuit breaker is used to disconnect a voltage of 400V, since each pole circuit breaker has a double breakpoint structure and each pole circuit breaker has two breakpoints, there are eight breakpoints in the four-pole circuit breaker. When an abnormal situation occurs in the circuit where the circuit breaker is located, it is equivalent to each breakpoint disconnecting a voltage of 50V. Compared with the situation in the prior art where each breakpoint disconnects a voltage of 100V, the circuit breaker with a double breakpoint structure has a smaller voltage on each breakpoint. When disconnecting, the arc energy generated is smaller and easier to extinguish, which is more conducive to disconnection and improves the safety of electricity use.

[0084] In the embodiment provided in the present application, the pushing mechanism 4 is arranged in the housing 1, and the pushing mechanism 4 has a contact support 43, and the contact support 43 is rotatably arranged in the housing 1. The moving contact 3 is movably arranged on the contact support 43, and the pushing mechanism 4 is used to drive the moving contact 3 to switch between the contact position and the separation position.

[0085] The specific structure of the pushing mechanism 4 is not specifically limited here. Similarly, the connection method between the moving contact 3 and the pushing mechanism 4 is not specifically limited here.

[0086] In actual situations, the moving contact 3 can be integrally formed with the contact support 43 , which facilitates the processing of the contact support 43 and the moving contact 3 , helps to improve the structural strength of the connection between the moving contact 3 and the contact support 43 , and improves the movement synchronization of the moving contact 3 and the contact support 43 .

[0087] Of course, the moving contact 3 can also be formed separately from the contact support 43 and then connected by a fixing method such as welding, clamping, riveting, etc., so as to realize synchronous movement of the moving contact 3 and the contact support 43.

[0088] In the embodiment provided in the present application, the moving contact 3 and the contact support 43 are separately provided.

[0089] At this time, when the moving contact 3 or the contact support 43 needs to be replaced or repaired, the contact support 43 or the moving contact 3 can be disassembled and replaced or repaired respectively. In particular, when the moving contact 3 or the contact support 43 needs to be replaced, only the contact support 43 or the moving contact 3 can be replaced separately, without replacing the moving contact 3 and the contact support 43 as a whole, which can save material and processing costs.

[0090] In addition, combined Figure 2 , Figure 6 and Figure 7 As shown, a mounting groove 433 matching with the mounting end is also provided on the contact support 43. The mounting end can be arranged in the mounting groove 433, and the groove wall of the mounting groove 433 is closely fitted with the mounting end.

[0091] In this way, not only the position of the mounting end in the mounting groove 433 can be limited. Furthermore, the relative position of the moving contact 3 and the contact support 43 is limited to remain unchanged, which can ensure that when the contact support 43 rotates relative to the housing 1, the moving contact 3 is synchronously driven to rotate relative to the housing 1, ensuring the synchronization of the movement of the moving contact 3 and the contact support 43, so that the contact end of the moving contact 3 can contact or disconnect with the two stationary contacts 2 at the same time.

[0092] See also Figure 6 and Figure 7 As shown, a central circular hole 432 is also provided on the contact support 43. The central circular hole 432 is matched with the rotating shaft 5.

[0093] In specific implementation, the central circular hole 432 cooperates with the rotating shaft 5, and the central circular hole 432 passes through the mounting groove 433. When the mounting end is set in the mounting groove 433, the axis of the through hole 34 is colinear with the axis of the central circular hole 432, and one end of the rotating shaft 5 passes through the central circular hole 432 and the through hole 34, and is connected to the housing 1, so that the moving contact 3 and the contact support 43 are set on the housing 1.

[0094] like Figure 2 As shown, the pushing mechanism 4 provided in the embodiment of the present application also includes a first elastic member 44, the two ends of which elastically act on the contact support 43 and the moving contact 3 respectively, and the first elastic member 44 is used to apply a force to the two contact ends to approach the corresponding static contact 2 when the moving contact 3 is in the contact position.

[0095] Specifically, the first elastic member 44 may be Figure 8 and Fig. 9 The first elastic member 44 is shown.

[0096] like Figure 8 As shown, the first elastic member 44 includes two torsion springs arranged opposite to each other.

[0097] For ease of description, the two torsion springs are defined as a first torsion spring 441 and a second torsion spring 442, and the axis of the first torsion spring 441 and the axis of the second torsion spring 442 are collinear. At the same time, the first torsion spring 441 is defined to have a first free end, a second free end, and a first body, and the second torsion spring 442 is defined to have a third free end, a fourth free end, and a second body.

[0098] See also Figure 8 As shown, the first free end and the second free end are both bent along the axis of the first torsion spring 441 toward the direction close to the second torsion spring 442 , and the third free end and the fourth free end are both bent along the axis of the second torsion spring 442 toward the direction close to the first torsion spring 441 .

[0099] In this way, the first free end and the third free end are arranged opposite to each other to form one end of the first elastic member 44 .

[0100] The second free end and the fourth free end are arranged opposite to each other to form the other end of the first elastic member 44 .

[0101] In fact, the first free end may be connected to the third free end, and the second free end may be connected to the fourth free end, so as to form an integrated first elastic member 44.

[0102] In the examples provided in this application, see Figure 8 The first free end and the third free end are arranged opposite to each other, and the second free end and the fourth free end are connected.

[0103] There is a gap between the first body and the second body, and the axis of the first body and the axis of the second body are collinear, forming the axis of the first elastic member 44. The first body and the second body form the body of the first elastic member 44.

[0104] The number of turns of the first torsion spring 441 and the second torsion spring 442 is not specifically limited here and is subject to actual conditions.

[0105] When implementing it, refer to Figure 6 and Figure 7 As shown, the contact support 43 is provided with limiting grooves 434 on both sides of the central circular hole 432 in the axial direction. The limiting grooves 434 are matched with the first body of the first torsion spring 441 and the second body of the second torsion spring 442 .

[0106] refer to Figure 2 In actual situations, after the first elastic member 44 is installed, the first body and the second body are respectively located in the corresponding limiting grooves 434. At the same time, one end of the first elastic member 44 is limited on the side wall of the contact support 43, and the other end of the first elastic member 44 is limited on the side wall of the moving contact 3.

[0107] Combination Figure 1 , Figure 2 , Figure 5 , Figures 7 to 9 As shown, the axis of the first torsion spring 441, the axis of the second torsion spring 442, the axis of the central circular hole 432, the axis of the through hole 34 and the axis of the rotating shaft 5 are all collinear. The first elastic member 44, the contact support 43 and the moving contact 3 are all rotatably connected to the housing 1 via the rotating shaft 5.

[0108] Furthermore, the first elastic member 44 , the contact support 43 , and the movable contact 3 can all rotate relative to the housing 1 around the axis of the rotating shaft 5 .

[0109] When the above technical solution is adopted, initially, the first elastic member 44 is in a free state, and the tangent lines between the two ends of the first elastic member 44 and the body of the first elastic member 44 have an angle α, such as Fig. 9 After the first elastic member 44 is installed, the two ends of the first elastic member 44 elastically act on the contact support 43 and the moving contact 3 respectively. At this time, the first elastic member 44 is in an installed state, and the connecting line between the two ends of the first elastic member 44 and the body of the first elastic member 44 has an angle β.

[0110] It can be understood that β>α, and the difference between β and α is 10° to 20°.

[0111] When the operator operates the handle 41 through the grip 412 to rotate relative to the housing 1, so that the handle 41 switches from the disconnected position to the closed position, and the moving contact 3 switches from the separated position to the contact position, when the two contact ends just contact the corresponding static contact 2, the first elastic member 44 is still in the installation state, so that the connection line between the two ends of the first elastic member 44 and the body of the first elastic member 44 has an angle β. When the handle 41 continues to rotate toward the closed position, the force exerted on the first elastic member 44 by the contact support 43 increases, and the force exerted on the end of the first elastic member 44 that elastically contacts the contact support 43 to move away from the contact support 43 also increases. Similarly, the force exerted on the end of the first elastic member 44 that elastically contacts the moving contact 3 to move away from the moving contact 3 gradually increases. Correspondingly, the force exerted on the moving contact 3 by the first elastic member 44 to move toward the static contact 2 gradually increases, so that the moving contact 3 can be ensured to be in reliable contact with the static contact 2.

[0112] When the handle 41 is in the closed position, an angle γ is formed between the lines connecting the two ends of the first elastic member 44 and the body of the first elastic member 44 , where γ>β.

[0113] It can be seen from this that when the moving contact 3 is in the contact position, the moving contact 3 is subjected to the force from the first elastic member 44, which can ensure that the two contact ends are in close contact with the corresponding static contacts 2, thereby avoiding unstable contact between the moving contact 3 and the static contact 2, which leads to increased contact resistance, and subsequently brings about problems such as increased temperature rise and decreased product performance.

[0114] In one example, a through opening is opened on one side of the housing 1 .

[0115] like Figure 2 As shown, the pushing mechanism 4 further includes a handle 41 and a connecting rod 42 . The handle 41 includes a handle body 411 and a gripping portion 412 that are connected to each other. The handle body 411 is rotatably disposed on the housing 1 .

[0116] Specifically, Figure 1 and Figure 2 As shown, the through opening can be opened at the top of the housing 1. One end of the grip portion 412 away from the handle body 411 extends out of the housing 1 through the through opening, so that the operator can hold the grip portion 412 to operate the handle 41, so that the handle body 411 rotates relative to the housing 1.

[0117] In actual situations, the handle body 411 may be a cylindrical structure, and the rotation axis of the cylindrical handle body 411 is parallel to the direction from the base 11 to the cover body 12, that is, the rotation axis of the handle body 411 is parallel to the second direction.

[0118] The handle body 411 and the grip portion 412 may be connected by threading, welding or clamping. Of course, the handle body 411 and the grip portion 412 may also be formed in one piece, which is not specifically limited here.

[0119] One end of the connecting rod 42 is rotatably connected to the handle body 411 , and the other end of the connecting rod 42 is rotatably connected to the contact support 43 .

[0120] When implementing it, Fig.10 As shown, the connecting rod 42 includes a connecting rod 421 and insertion ends 422 disposed at both ends of the connecting rod 421 in the length direction. The insertion ends 422 are located on the same side of the connecting rod 421, so that the connecting rod 42 is in a U-shaped structure.

[0121] In actual situations, an insertion hole matching one of the insertion ends 422 is opened on the handle body 411, the insertion end 422 extends into the insertion hole, and the insertion end 422 is movably arranged in the insertion hole, that is, the insertion end 422 can rotate relative to the handle body 411 in the insertion hole.

[0122] It should be noted that the axis of the insertion hole is staggered with the rotation axis of the handle body 411. Thus, when the handle body 411 rotates, the axis of the insertion hole rotates synchronously around the rotation axis of the handle body 411, thereby changing the position of the insertion end 422 connected to the handle body 411 relative to the housing 1.

[0123] Likewise, if Figure 6 and Figure 7 As shown, a connection hole 431 is provided on the contact support 43 to match another insertion end 422. The insertion end 422 extends into the connection hole 431 and is movably arranged in the connection hole 431, that is, the insertion end 422 can rotate relative to the contact support 43 in the connection hole 431.

[0124] Moreover, the axis of the connecting hole 431 is staggered with the rotation axis of the contact support 43. Thus, when the handle body 411 rotates, the position of the insertion end 422 connected to the handle body 411 changes relative to the housing 1, and further, the position of the insertion end 422 connected to the contact support 43 changes relative to the housing 1, thereby driving the contact support 43 to rotate around the rotating shaft 5, and realizing the rotation of the contact support 43 relative to the housing 1.

[0125] In this way, when the operator holds the grip portion 412 and operates the handle 41 to rotate the handle body 411 relative to the housing 1, the insertion end 422 of the connecting rod 42 connected to the handle body 411 is synchronously driven to rotate relative to the housing 1. Furthermore, the insertion end 422 of the connecting rod 42 connected to the contact support 43 rotates relative to the housing 1, thereby driving the contact support 3 to rotate relative to the housing 1.

[0126] Furthermore, the mounting end of the moving contact 3 is movably disposed on the contact support 43 .

[0127] Here, it should be noted that the mounting end is movably arranged on the contact support 43 , that is, the mounting end and the contact support 43 move synchronously, and further, the moving contact 3 and the contact support 43 move synchronously.

[0128] Exemplarily, when the contact support 43 rotates relative to the housing 1 , the mounting end and the contact support 43 move synchronously, so that the mounting end rotates synchronously relative to the housing 1 . Further, the moving contact 3 rotates relative to the housing 1 .

[0129] Moreover, the handle 41 has an opening position and a closing position relative to the housing 1. When the handle 41 is in the opening position, the moving contact 3 is in the separation position. When the handle 41 is in the closing position, the moving contact 3 is in the contact position.

[0130] In this case, when the operator operates the handle 41 to rotate relative to the housing 1 through the gripping portion 412, the handle 41 switches between the open position and the closed position, thereby driving the moving contact 3 to switch between the separated position and the contact position, so as to realize the switching of the circuit breaker between the open state and the closed state.

[0131] In some embodiments, in combination Figure 2 , Figure 6 and Figure 7 As shown, a first limiting groove 435 is provided on the contact support 43 at a position contacting one end of the first elastic member 44 .

[0132] In this way, one end of the first elastic member 44 is limited in the first limiting groove 435, avoiding the phenomenon that one end of the first elastic member 44 slides relative to the contact support 43, affecting the force of the first elastic member 44 acting on the moving contact 3, and reducing the contact stability between the moving contact 3 and the static contact 2.

[0133] In addition, combined Figure 2 and Figure 5 As shown, a second limiting groove 31 is provided on the moving contact 3 at a position in contact with the other end of the first elastic member 44 .

[0134] At this time, the other end of the first elastic member 44 is limited in the second limiting groove 31, avoiding the other end of the first elastic member 44 from sliding relative to the moving contact 3, affecting the force of the first elastic member 44 acting on the moving contact 3, and reducing the contact stability between the moving contact 3 and the static contact 2.

[0135] As an implementable manner, the two contact terminals are respectively a first contact terminal and a second contact terminal.

[0136] like Figures 2 to 5 As shown, the moving contact 3 includes a first rotating arm 32 and a second rotating arm 33 , and one end of the first rotating arm 32 is connected to one end of the second rotating arm 33 to form a mounting end.

[0137] In a specific implementation, the first rotating arm 32 and the second rotating arm 33 can be integrally formed, so that during actual installation, the positioning, matching and installation of the first rotating arm 32 and the second rotating arm 33 are omitted. At the same time, the structural strength of the moving contact 3 can be enhanced.

[0138] The other end of the first rotating arm 32 is a first contact end, and the other end of the second rotating arm 33 is a second contact end.

[0139] In actual situations, the first contact end corresponds to the first stationary contact 21 , and the second contact end corresponds to the second stationary contact 22 .

[0140] Furthermore, in the embodiments provided in this application, Figure 2 Taking the placement shown as an example, when the static contact 2 is in the contact position, when the first contact end contacts the first static contact 21, the first static contact 21 is located on the left side of the first contact end. When the second contact end contacts the second static contact 22, the second static contact 22 is located below the second contact end.

[0141] In addition, in the specific implementation, Figure 2 As shown, one end of the first elastic member 44 contacts the side of the contact support 43 away from the handle body 411 , and the other end of the first elastic member 44 contacts the side of the second rotating arm 33 away from the first rotating arm 32 .

[0142] According to the dimensional chain structure design, refer to Figure 2 and Figure 5 As shown, the structure of the first rotating arm 32 is a linear plate structure, and the structure of the second rotating arm 33 is an arcuate plate structure, and the center of curvature of the arcuate plate structure is located on the side of the arcuate plate structure away from the first contact end.

[0143] At this time, the moving contact 3 is a structure similar to a "herringbone". The first rotating arm 32 is a linear plate-like structure, which is relatively easy to process and form. Moreover, when the moving contact 3 is in the separated position, the first rotating arm 32 is set as a linear plate-like structure, which is conducive to ensuring the distance between the first rotating arm 32 and the first stationary contact 21.

[0144] In addition, when the moving contact 3 is in the separated position, the distance between the first contact end and the first stationary contact 21 is 5 mm-5.5 mm. Similarly, the distance between the second contact end and the second stationary contact 22 is 5 mm-5.5 mm.

[0145] In this case, it can be ensured that when the handle 41 switches from the closed position to the open position and the moving contact 3 switches from the contact position to the separated position, the generated arc is elongated and the arc energy gradually decreases until the arc is disconnected and extinguished, thereby improving the reliability of the circuit breaker's disconnection.

[0146] Please combine Figure 2 and Figure 5 As shown, the first contact end is provided with a first recessed portion 321, a first protruding portion 322 and a second recessed portion 323 on one side thereof for contacting the corresponding stationary contact 2. The first recessed portion 321, the first protruding portion 322 and the second recessed portion 323 are arranged in sequence from the mounting end to the first contact end, and the first protruding portion 322 is used to contact the corresponding stationary contact 2. Specifically, the first protruding portion 322 is used to contact the first stationary contact 21.

[0147] Thus, when the moving contact 3 is in the contact position, the first protrusion 322 contacts the corresponding stationary contact 2. When the moving contact 3 switches from the contact position to the separation position, the generated arc moves along the first recessed portion 321 and the second recessed portion 323 in a direction away from the first protrusion 322 under the action of the electromotive repulsive force, which helps to reduce the energy of the arc and extinguish the arc.

[0148] It is understandable that the setting of the first protrusion 322 is that when the operator operates the handle 41 to rotate relative to the housing 1 through the grip 412, so that the handle 41 switches from the disconnected position to the closed position, and the moving contact 3 switches from the separated position to the contact position, when the first contact end and the first static contact 21 just come into contact, it is a point contact, that is, a certain point on the first protrusion 322 contacts a certain point on the first static contact 21. When the handle 41 continues to rotate toward the closed position, the contact mode between the first contact end and the first static contact 21 changes from point contact to line contact. At this time, the contact area between the first rotating arm 32 and the first static contact 21 is large, the contact is relatively stable, and the internal resistance at the position where the first rotating arm 32 contacts the first static contact 21 is small. During the power-on process, the product will not cause excessive temperature rise due to the large resistance value, thereby affecting the service life.

[0149] Continue to combine Figure 2 and Figure 5 As shown, a third recessed portion 331, a second protruding portion 332 and a fourth recessed portion 333 are provided on one side of the second contact end for contacting the corresponding stationary contact 2. The third recessed portion 331, the second protruding portion 332 and the fourth recessed portion 333 are arranged in sequence from the mounting end to the second contact end, and the second protruding portion 332 is used to contact the corresponding stationary contact 2. Specifically, the second protruding portion 332 is used to contact the second stationary contact 22.

[0150] Thus, when the moving contact 3 is in the contact position, the second protrusion 332 contacts the corresponding stationary contact 2. When the moving contact 3 switches from the contact position to the separation position, the generated arc moves along the third recess 331 and the fourth recess 333 in a direction away from the second protrusion 332 under the action of the electromotive repulsive force, which helps to reduce the energy of the arc and extinguish the arc.

[0151] Similarly, it can be understood that the second protrusion 332 is set so that when the operator operates the handle 41 to rotate relative to the housing 1 through the grip 412, so that the handle 41 switches from the disconnected position to the closed position, and the moving contact 3 switches from the separated position to the contact position, when the second contact end and the second static contact 22 just come into contact, it is a point contact, that is, a certain point on the second protrusion 332 contacts a certain point on the second static contact 22. When the handle 41 continues to rotate toward the closed position, the contact mode between the second contact end and the second static contact 22 changes from point contact to line contact. At this time, the contact area between the second rotating arm 33 and the second static contact 22 is large, the contact is relatively stable, and the internal resistance at the position where the second rotating arm 33 contacts the second static contact 22 is small. During the power-on process, the product will not cause excessive temperature rise due to the large resistance value, thereby affecting the service life.

[0152] In one example, the second rotating arm 33 includes a first section and a second section, and the point with the shortest distance between the second rotating arm 33 and the first contact end is defined as the bending point of the second rotating arm 33. The first section is between the mounting end and the bending point, and the second section is between the bending point and the second contact end. The third recessed portion 331, the second protruding portion 332, and the fourth recessed portion 333 are all arranged on the second section.

[0153] For example, see Figure 5 As shown, the angle between the first section and the second section is δ, 115°≤δ≤125°.

[0154] In a specific implementation, δ can be 115°, 118°, 120°, 124°, 125°, etc.

[0155] Through the functional structure analysis of the dimension chain and the 3D printing molding test, it can be learned that when 115°≤δ≤125°, it is helpful to ensure that when the moving contact 3 is in the contact position, the center of the first protrusion 322 contacts the center of the first static contact point on the first static contact 21, and the center of the second protrusion 332 contacts the center of the second static contact point on the second static contact 22, so that the moving contact 3 can be reliably contacted with the two static contacts 2.

[0156] In some embodiments, Figure 2As shown, the pushing mechanism 4 provided in the embodiment of the present application further includes a second elastic member 45, and the two ends of the second elastic member 45 elastically act on the contact support 43 and the housing 1 respectively. The second elastic member 45 is used to apply a force to the contact support 43 to approach the handle 41 when the handle 41 is in the closed position.

[0157] In a specific implementation, the second elastic member 45 may be a spring.

[0158] When the handle 41 is in the closed position, the second elastic member 45 is compressed, one end of the second elastic member 45 is pressed against the inner wall of the housing 1, and the other end of the second elastic member 45 is pressed against the contact support 43, exerting a force on the contact support 43 to move closer to the handle 41.

[0159] When the handle 41 is switched from the closed position to the open position, the second elastic member 45 can release energy and exert a force on the contact support 43 to approach the handle 41, so that the push mechanism 4 is quickly reset and the handle 41 is quickly switched from the closed position to the open position. At the same time, the moving contact 3 is quickly separated from the static contact 2, the arc is also quickly elongated, and the arc energy is weakened until it is extinguished, so as to achieve the purpose of quickly breaking the arc.

[0160] As an alternative, see Figure 2 As shown, a limiting portion 13 is provided on the housing 1, and the limiting portion 13 is provided between the handle 41 and the contact support 43. The limiting portion 13 is used to limit the position of the contact support 43 relative to the handle 41 when the handle 41 is in the disconnected position.

[0161] In this way, the setting of the limit portion 13 can isolate the handle 41 and the contact support 43, avoiding that the distance between the contact support 43 and the handle 41 is too close or even close to each other when the handle 41 is in the disconnected position, thereby preventing interference when the handle 41 switches from the disconnected position to the closed position.

[0162] In one possible implementation, combining Figure 2 , Figure 3 and Figure 4 The stationary contact 2 has an extension portion, which extends from a position of the stationary contact 2 for contacting the moving contact 3 in a direction away from the moving contact 3 , and the extension portion is a U-shaped extension portion 23 .

[0163] like Figure 3 and Figure 4 As shown, both the first fixed contact 21 and the second fixed contact 22 have a U-shaped extension 23 .

[0164] In this way, on the one hand, the magnetic field and the electric repulsion acting on the moving contact 3 are enhanced. When an abnormal situation occurs in the circuit where the circuit breaker is located, the moving contact 3 and the static contact 2 can be accelerated to break contact, and the arc is easily elongated, making the arc thinner, and then the arc energy is weakened until it is extinguished. On the other hand, at the moment when the moving contact 3 and the static contact 2 are out of contact, the generated arc will move along the U-shaped extension 23 and be guided to a position away from the static contact, which is conducive to weakening the arc energy until the arc is extinguished.

[0165] In summary, the arc generated at the moment when the moving contact 3 and the stationary contact 2 are out of contact in the circuit breaker provided in the embodiment of the present application can be moved in the direction away from the contact position between the moving contact 3 and the stationary contact 2 through the first recess 321, the second recess 323, the third recess 331, the fourth recess 333, and the U-shaped extension 23, effectively reducing the possibility of the arc staying between the moving contact 3 and the stationary contact 2 and damaging the moving contact 3 or the stationary contact 2. The energy of the arc is weakened during the movement until it is extinguished. In this way, the circuit breaker provided in the embodiment of the present application can omit the arc extinguishing grid structure, and the structure is relatively simple, so that the volume of the housing 1 is relatively small.

Claims

1. A circuit breaker, characterized in that: include: case; Two stationary contacts are arranged in the housing; A moving contact, rotatably disposed in the housing; The moving contact has two contact ends respectively used to contact with the two stationary contacts; The moving contact has a contact position and a separation position relative to the housing. When the moving contact is in the contact position, the two contact ends are in contact with the corresponding static contacts at the same time, and the circuit breaker is in a closed state. When the moving contact is in the separated position, the two contact ends are simultaneously out of contact with the corresponding static contacts, and the circuit breaker is in an off state; A pushing mechanism is arranged in the housing; the pushing mechanism has a contact support, and the contact support is rotatably arranged in the housing; the moving contact is movably arranged on the contact support, and the pushing mechanism is used to drive the moving contact to switch between the contact position and the separation position; A first elastic member, two ends of which elastically act on the contact support and the moving contact respectively, and the first elastic member is used to apply a force to the two contact ends approaching the corresponding static contact when the moving contact is in the contact position.

2. The circuit breaker according to claim 1, characterized in that: A through opening is provided on one side of the shell; The driving mechanism also includes: A handle, the handle comprising a handle body and a gripping portion connected to each other, the handle body being rotatably disposed on the housing; an end of the gripping portion away from the handle body extending out of the housing through the through opening; the handle having an open position and a closed position relative to the housing, when the handle is in the open position, the moving contact is in the separated position; when the handle is in the closed position, the moving contact is in the contact position; A connecting rod has one end rotatably connected to the handle body, and the other end of the connecting rod is rotatably connected to the contact support.

3. The circuit breaker according to claim 1, characterized in that: A first limiting groove is provided on the contact support at a position in contact with one end of the first elastic member; and / or a second limiting groove is provided on the moving contact at a position in contact with the other end of the first elastic member.

4. The circuit breaker according to claim 1, characterized in that: The two contact ends are respectively a first contact end and a second contact end; The moving contact includes a first rotating arm and a second rotating arm, one end of the first rotating arm is connected to one end of the second rotating arm to form a mounting end of the moving contact; the other end of the first rotating arm is the first contact end, and the other end of the second rotating arm is the second contact end.

5. The circuit breaker according to claim 4, characterized in that: The structure of the first rotating arm is a linear plate-shaped structure, and the structure of the second rotating arm is an arc-shaped plate-shaped structure, wherein the center of curvature of the arc-shaped plate-shaped structure is located on a side of the arc-shaped plate-shaped structure away from the first contact end.

6. The circuit breaker according to claim 5, characterized in that: A first recessed portion, a first protruding portion, and a second recessed portion are provided on one side of the first contact end for contacting the corresponding static contact. The first recessed portion, the first protruding portion, and the second recessed portion are arranged in sequence from the mounting end to the first contact end, and the first protruding portion is used for contacting the corresponding static contact.

7. The circuit breaker according to claim 5, characterized in that: A third recessed portion, a second protruding portion and a fourth recessed portion are provided on one side of the second contact end for contacting the corresponding static contact, and the third recessed portion, the second protruding portion and the fourth recessed portion are arranged in sequence from the mounting end to the second contact end, and the second protruding portion is used for contacting the corresponding static contact.

8. The circuit breaker according to claim 2, characterized in that: The pushing mechanism also includes a second elastic member, two ends of which elastically act on the contact support and the housing respectively; the second elastic member is used to apply a force to the contact support approaching the handle when the handle is in the closed position.

9. The circuit breaker according to claim 2, characterized in that: The housing is provided with a limiting portion, the limiting portion is provided between the handle and the contact support, and the limiting portion is used to limit the position of the contact support relative to the handle when the handle is in the disconnected position.

10. The circuit breaker according to claim 1, characterized in that The stationary contact has an extension portion, which extends from a position of the stationary contact for contacting the moving contact in a direction away from the moving contact, and is a U-shaped extension portion.

Images