Circuit breaker

Abstract

The utility model discloses a circuit breaker. The circuit breaker comprises a frame body; the traction rod is rotationally connected to the frame body; the first backup protection structure and the second backup protection structure are arranged separately and are arranged on the frame body; the third backup protection structure is arranged on the frame body and located between the first backup protection structure and the second backup protection structure, and the first backup protection structure, the second backup protection structure and the third backup protection structure abut against the traction rod and are all configured to push the traction rod so that the traction rod can rotate back and forth relative to the frame body. According to the circuit breaker disclosed by the invention, the A phase is provided with the first backup protection, the C phase is provided with the second backup protection, and the third backup protection structure is additionally arranged on the intermediate phase between the A phase and the C phase, so that the first backup protection structure, the second backup protection structure and the third backup protection structure can play a line protection role; and the breaking reliability of the circuit breaker is improved by adopting three-phase backup protection.

Description

Technical Field

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

[0002] Molded case circuit breakers are divided into electronic and thermal magnetic types, both of which can automatically disconnect after the current exceeds the set value. Among them, the electronic molded case circuit breaker uses the control signal generated by the electronic controller to activate the release, thereby pushing the traction rod on the operating system to disconnect the circuit breaker. When the control signal is cancelled, the release and the traction rod are reset to achieve the circuit breaker again. However, when there is a large short-circuit current in the circuit, the electronic molded case circuit breaker needs a current detection amplification and signal conversion process. As a result, it cannot disconnect the fault very quickly, and once the electronic controller fails, it cannot effectively protect the line. The existing electronic molded case circuit breaker is equipped with an operating system at the position of the middle phase, so only magnetic backup protection releases can be added to phases A and C, and the release cannot be set at the position corresponding to the middle phase. The traction rods on the operating system extend to phases A and C respectively, so that the release can act on the traction rod, which solves the problem of line protection, but the disconnection reliability is always poor. Utility Model Content

[0003] In order to solve the above problems, the present application provides a circuit breaker.

[0004] According to one aspect of an embodiment of the present application, a circuit breaker is disclosed, which includes a frame; a traction rod rotatably connected to the frame; a first backup protection structure and a second backup protection structure separately arranged, the first backup protection structure and the second backup protection structure are arranged on the frame; a third backup protection structure is arranged on the frame and is located between the first backup protection structure and the second backup protection structure, the first backup protection structure, the second backup protection structure and the third backup protection structure are all against the traction rod, and the first backup protection structure, the second backup protection structure and the third backup protection structure are all configured to push the traction rod so that the traction rod rotates back and forth relative to the frame.

[0005] In an exemplary embodiment, at least one of the third backup protection structure and the first backup protection structure includes: a first bracket, which is arranged on the frame; an armature, which is rotatably connected to the first bracket; a second bracket, which is rotatably connected to the first bracket, and the second bracket is connected to or abuts against the armature so that the second bracket and the armature rotate synchronously relative to the first bracket; a magnetic member, which is arranged on the first bracket and is configured to drive the armature to rotate relative to the first bracket by generating a magnetic force; and an elastic reset member, one end of which is connected to the first bracket or the magnetic member, and the other end is connected to the armature or the second bracket.

[0006] In an exemplary embodiment, the armature includes a first U-shaped portion; the second bracket includes a second U-shaped portion and a push piece, the opposite sides of the second U-shaped portion are rotatably connected to the first bracket, the inner bottom surface of the second U-shaped portion and the outer bottom surface of the first U-shaped portion are in contact with each other, and the push piece is arranged on the outer bottom surface of the second U-shaped portion.

[0007] In an exemplary embodiment, a side surface of the armature is provided with an embedding groove, and side edges on opposite sides of the second U-shaped portion are provided with limiting blocks extending in opposite directions, and the limiting blocks extend into the embedding groove.

[0008] In an exemplary embodiment, the embedding groove is arranged on the rear side surface of the armature, the second U-shaped portion constructs a space that runs through the front and back, the limit block is arranged on the rear side edge of the second U-shaped portion, the magnetic member is configured to drive the armature to swing backward relative to the first bracket by generating a magnetic force, and the elastic reset member is configured to provide a reset force for the armature to swing forward and reset.

[0009] In an exemplary embodiment, one end of the shifting member away from the second U-shaped portion is bent forward in an arc shape.

[0010] In an exemplary embodiment, the first bracket includes a third U-shaped portion, and the armature and the magnetic member are both located in the third U-shaped portion.

[0011] In an exemplary embodiment, two opposite sides of the third U-shaped portion are connected to a rotating shaft, and the armature is rotatably connected to the rotating shaft; the second bracket includes a second U-shaped portion, two opposite sides of the second bracket are rotatably connected to the rotating shaft, and an opening of the second U-shaped portion is opposite to an opening of the third U-shaped portion.

[0012] In an exemplary embodiment, the armature includes a first U-shaped portion, and the magnetic member includes a fourth U-shaped portion, and the opening of the first U-shaped portion is opposite to the opening of the fourth U-shaped portion; and / or the magnetic member is screwed to the first bracket; and / or the armature is provided with a first attraction slope, and the magnetic member is provided with a second attraction slope, and the first attraction slope is opposite to the second attraction slope; and / or the first bracket is provided with a rotating shaft, and the armature and the second bracket are both rotatably connected to the rotating shaft, and the elastic reset member is a torsion spring, and the torsion spring is sleeved on the rotating shaft, and the first torsion arm and the second torsion arm extend from both ends of the torsion spring, the first torsion arm abuts against the armature, and the second torsion arm abuts against the magnetic member; and / or the second bracket abuts against the traction rod, and when the armature rotates back and forth relative to the first bracket, it can drive the second bracket to push the traction rod, so that the traction rod rotates back and forth relative to the frame.

[0013] In an exemplary embodiment, the frame includes a base frame and an operating system, the third backup protection structure and the first backup protection structure are arranged on the base frame, the traction rod is rotatably connected to the operating system, the third backup protection structure has a pushing end that can push the traction rod to rotate, and the operating system is arranged on the base frame and facing the pushing end of the third backup protection structure; and / or at least three installation cavities are spaced side by side on the frame, and the third backup protection structure and the first backup protection structure are respectively arranged one-to-one in the installation cavities.

[0014] The technical solution provided by the embodiments of the present application includes at least the following beneficial effects:

[0015] In the circuit breaker disclosed in the present application, a first backup protection is provided on phase A, a second backup protection is provided on phase C, and a third backup protection structure is newly added on the middle phase between phase A and phase C, so that the first backup protection structure, the second backup protection structure and the third backup protection structure can all play a role in line protection, have three-phase backup protection, and improve the circuit breaker disconnection reliability.

[0016] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the description, are used to explain the principles of the present application.

[0018] Figure 1 A structural diagram of a circuit breaker provided in one embodiment of the present application;

[0019] Figure 2 A structural diagram of a circuit breaker in a tripped state provided by an embodiment of the present application;

[0020] Figure 3 A side view of a circuit breaker provided in an embodiment of the present application in cooperation with a traction rod in a tripped state;

[0021] Figure 4 A structural diagram of a circuit breaker in a re-locked state provided by an embodiment of the present application;

[0022] Figure 5 A structural diagram of a circuit breaker provided in an embodiment of the present application cooperating with a traction rod in a re-engaged state;

[0023] Figure 6 A back structural diagram of a circuit breaker provided in one embodiment of the present application;

[0024] Figure 7A back structural diagram of a circuit breaker provided in an embodiment of the present application at another viewing angle;

[0025] Figure 8 A structural diagram of a circuit breaker provided in an embodiment of the present application when the frame is ignored;

[0026] Fig. 9 A structural diagram of a base frame provided in one embodiment of the present application.

[0027] The following are the descriptions of the reference numerals:

[0028] 1010-frame, 1011-base, 1012-operating system, 1020-traction rod, 1030-third backup protection structure, 1040-first backup protection structure, 1050-braid, 1060-second backup protection structure, 100-first bracket, 110-armature, 120-second bracket, 121-second U-shaped portion, 122-push piece, 130-magnetic piece, 140-elastic reset piece, 150-rotating shaft, 310-first U-shaped portion, 510-embedded groove, 520-limiting block, 530-first suction slope, 540-second suction slope, 600-torsion spring, 610-first torsion arm, 620-second torsion arm, 630-third U-shaped portion, 640-fourth U-shaped portion, 910-installation cavity. DETAILED DESCRIPTION

[0029] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that the description of this application will be more comprehensive and complete, and the concept of the example embodiments will be fully conveyed to those skilled in the art.

[0030] In the description of the utility model, all the connection relationships mentioned do not refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the utility model can be combined interchangeably without conflicting with each other.

[0031] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0032] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number, and "above", "below", "within" etc. are understood to include the number.

[0034] Reference Figure 1 The circuit breaker disclosed in the present application includes a frame 1010; a traction rod 1020, which is rotatably connected to the frame 1010; a first backup protection structure 1040 and a second backup protection structure 1060 that are separately arranged, and the first backup protection structure 1040 and the second backup protection structure 1060 are arranged on the frame 1010; a third backup protection structure 1030, which is arranged on the frame 1010 and is located between the first backup protection structure 1040 and the second backup protection structure 1060, and the first backup protection structure 1040, the second backup protection structure 1060 and the third backup protection structure 1030 are all against the traction rod 1020, and the first backup protection structure 1040, the second backup protection structure 1060 and the third backup protection structure 1030 are all configured to push the traction rod 1020 so that the traction rod 1020 rotates back and forth relative to the frame 1010.

[0035] Specifically, the circuit breaker has phase A, a middle phase and phase C, phase A and phase C are on both sides of the middle phase, phase A is provided with a first backup protection, phase C is provided with a second backup protection, and a third backup protection structure 1030 is newly added on the middle phase between phase A and phase C, so that the first backup protection structure 1040, the second backup protection structure 1060 and the third backup protection structure 1030 can all play a role in line protection, have three-phase backup protection, and improve the circuit breaker disconnection reliability.

[0036] Combination Figure 1The frame 1010 includes a base frame 1011 and an operating system 1012. The first backup protection structure 1040, the second backup protection structure 1060 and the third backup protection structure 1030 are arranged on the base frame 1011. The traction rod 1020 is rotatably connected to the operating system 1012. The third backup protection structure 1030 has a driving end capable of driving the traction rod 1020 to rotate. The operating system 1012 is arranged on the base frame 1011 and faces the driving end of the third backup protection structure 1030. The third backup protection structure 1030 corresponding to the middle phase is arranged corresponding to the operating system 1012. When the same current is applied to the A phase, the middle phase and the C phase, the force required for the traction rod 1020 to trip through the third backup protection structure 1030 of the middle phase is minimal, thereby improving the force sensitivity of the traction rod 1020 and improving the breaking reliability of the circuit breaker.

[0037] In this embodiment, refer to Figure 8 and Fig. 9 At least three installation cavities 910 are arranged side by side and spaced apart on the frame body 1010, and the first backup protection structure 1040, the second backup protection structure 1060, and the third backup protection structure 1030 are arranged one-to-one in the installation cavity 910. In this embodiment, the first bracket 100 is arranged on the bottom frame 1011, and the first backup protection structure 1040, the second backup protection structure 1060, and the third backup protection structure 1030 are arranged side by side and spaced apart.

[0038] Specifically, the first backup protection structure 1040, and / or the second backup protection structure 1060, and / or the third backup protection structure 1030 of the present application form a complete assembly, which can be directly installed on the three installation cavities 811 of the frame 810, respectively. The installation is simple and the structure is stable, which improves the installation stability of the first backup protection structure 1040, the second backup protection structure 1060, and the third backup protection structure 1030. The position and size of the first backup protection structure 1040, the second backup protection structure 1060, and the third backup protection structure 1030 corresponding to different installation cavities 811 can be unified, reducing production inventory. The circuit breaker of the present application has three-phase backup protection, which improves the circuit breaker disconnection reliability.

[0039] Reference Figure 2 and Figure 4The third backup protection structure 1030 includes a first bracket 100, an armature 110, a second bracket 120, a magnetic member 130 and an elastic reset member 140, wherein the first bracket 100 is arranged on the frame 1010; the armature 110 is rotatably connected to the first bracket 100; the second bracket 120 is rotatably connected to the first bracket 100, and the second bracket 120 is connected or abuts against the armature 110, so that the second bracket 120 and the armature 110 rotate synchronously relative to the first bracket 100; the magnetic member 130 is arranged on the first bracket 100, and the magnetic member 130 is configured to drive the armature 110 to rotate relative to the first bracket 100 by generating a magnetic force; one end of the elastic reset member 140 is connected to the first bracket 100 or the magnetic member 130, and the other end of the elastic reset member 140 is connected to the armature 110 or the second bracket 120. Furthermore, the second bracket 120 abuts against the traction rod 1020 , and when the armature 110 rotates back and forth relative to the first bracket 100 , it can drive the second bracket 120 to push the traction rod 1020 , so that the traction rod 1020 rotates back and forth relative to the frame 1010 .

[0040] Specifically, the armature 110 and the second bracket 120 are both rotatably connected to the first bracket 100, and the second bracket 120 is connected to or abuts against the armature 110. Figure 3 When the magnetic member 130 generates magnetic force and drives the armature 110 to rotate relative to the first bracket 100, the armature 110 can transmit force to the second bracket 120 through the connection or abutment relationship, thereby driving the second bracket 120 to rotate relative to the first bracket 100 at the same time, so that the second bracket 120 acts as the pushing end of the third backup protection structure 1030 and further pushes the traction rod 210 on the circuit breaker to trip the circuit breaker, referring to Figure 5 After the magnetic member 130 cancels the magnetic adsorption of the armature 110, the elastic reset member 140 can drive the armature 110 and the second bracket 120 to reset together, so that the second bracket 120 pushes the traction rod 210 to lock the circuit breaker again. The utility model transmits the rotational force to the second bracket 120 through the armature 110, so that the second bracket 120 pushes the traction rod 210 as the armature 110 rotates, reducing the torque on the armature 110, improving the strength and service life of the armature 110, and reducing the production cost. In this embodiment, the armature 110 is an iron block that can be attracted by the fixed magnetic part 130 to move and form a closed magnetic circuit. The magnetic part 130 can be an iron core. A braid wire 1050 can be passed between the armature 110 and the magnetic part 130. After the braid wire 1050 is energized, the armature 110 and the magnetic part 130 generate magnetic attraction. After the braid wire 1050 is de-energized, the magnetic attraction between the armature 110 and the magnetic part 130 is canceled, and the armature 110 and the second bracket 120 are reset.

[0041] The third backup protection structure 1030 using the above-mentioned structure can reduce the space occupied by the third backup protection structure 1030, can push the traction rod 1020 through the movement of the second bracket 120, and stagger the movement space of the second bracket 120 and the installation position of the operating system 1012, so as to facilitate the installation of the third backup protection structure 1030 on the frame 1010. In addition, at least one of the first backup protection structure 1040, the second backup protection structure 1060 and the third backup protection structure 1030 may include a first bracket 100, an armature 110, a second bracket 120, a magnetic member 130 and an elastic reset member 140. In the present application, the first backup protection structure 1040, the second backup protection structure 1060 and the third backup protection structure 1030 have the same structure to reduce production inventory, and the armature 110, the second bracket 120 and the magnetic member 130 are all arranged on the first bracket 100 to form an integral combined structure, so that the staff can directly install the overall first backup protection structure 1040, the second backup protection structure 1060 and the third backup protection structure 1030 on the frame 1010, thereby improving the installation efficiency.

[0042] Furthermore, the armature 110 includes a first U-shaped portion 310; the second bracket 120 includes a second U-shaped portion 121 and a shift piece 122, the second U-shaped portion 121 is rotatably connected to the first bracket 100 on two opposite sides, the inner bottom surface of the second U-shaped portion 121 is in contact with the outer bottom surface of the first U-shaped portion 310, and the shift piece 122 is arranged on the outer bottom surface of the second U-shaped portion 121.

[0043] Specifically, the first U-shaped portion 310 of the armature 110 and the second U-shaped portion 121 of the second bracket 120 correspond to each other, and the second U-shaped portion 121 is surrounded by the outer side of the first U-shaped portion 310, and the inner bottom surface of the second U-shaped portion 121 fits with the outer bottom surface of the first U-shaped portion 310, so that the second bracket 120 can be dragged by the armature 110 to achieve relative rotation with the first bracket 100 by fitting into the surface of the armature 110. The structure is simple, and the assembly of the armature 110 and the second bracket 120 is convenient. At the same time, the first U-shaped portion 310 of the armature 110 ensures that the armature 110 can easily form a closed magnetic field, thereby improving the magnetic field strength.

[0044] In fact, the outer surface of the first U-shaped portion 310 can correspond to the inner surface of the second U-shaped portion 121 one by one, and the corresponding surfaces of the two can also fit each other one by one, thereby improving the stability of the synchronous rotation of the two. In addition, only the inner bottom surface of the second U-shaped portion 121 can fit the outer bottom surface of the first U-shaped portion 310 to reduce the precision of parts production. In addition, the first U-shaped portion 310 can also be rotatably connected to the first bracket 100 at the bottom position of the U-shape. In some other embodiments, the first U-shaped portion 310 can also be surrounded by the outer side of the second U-shaped portion 121, the dial 122 can bypass the first U-shaped portion 310 or directly pass through the first U-shaped portion 310 to extend, the magnetic member 130 is arranged opposite to the armature 110, and the dial 122 extends to the side of the armature 110 that is away from the magnetic member 130, so that the dial 122 can extend to the side that can push the traction rod 210. In some other embodiments, the second bracket 120 can also achieve synchronous rotation with the armature 110 through connection methods such as covering, clamping, snap connection, or concave-convex matching structure, as long as the second bracket 120 can always be driven to rotate by the armature 110 through contact and resistance.

[0045] Reference Figure 6 The side of the armature 110 is provided with an embedding groove 510, and the side edges of the second U-shaped portion 121 on opposite sides are provided with limit blocks 520 extending in opposite directions, and the limit blocks 520 extend into the embedding groove 510. Specifically, the limit blocks 520 on the second U-shaped portion 121 extend into the embedding groove 510 of the armature 110, and the limit blocks 520 and the embedding groove 510 cooperate with each other to reduce the relative sliding between the armature 110 and the second bracket 120, avoid the relative tilting or falling of the second bracket 120 and the armature 110, and improve the synchronous rotation stability of the armature 110 and the second bracket 120.

[0046] Furthermore, in the present embodiment, the magnetic member 130 is configured to drive the armature 110 to swing backward relative to the first bracket 100 by generating a magnetic force, and the elastic reset member 140 is configured to provide a reset force for the armature 110 to swing forward and reset, and the first U-shaped portion 310 and the second U-shaped portion 121 both construct a space that runs through the front and back, the limit block 520 is arranged on the rear side of the second U-shaped portion 121, and the embedding groove 510 is arranged on the rear side of the armature 110.

[0047] Specifically, the first U-shaped portion 310 and the second U-shaped portion 121 are both connected front to back, and the limit block 520 extends into the embedded groove 510 on the rear side of the armature 110. When the armature 110 swings forward to reset, the embedded groove 510 can assist in driving the limit block 520 to rotate with the armature 110. When the armature 110 swings backward, the bottom of the embedded groove 510 can simultaneously push the limit block 520 to rotate with the armature 110. Under the cooperation of the embedded groove 510 and the limit block 520, and under the dragging of the fitting surface of the first U-shaped portion 310 and the second U-shaped portion 121, the synchronous rotation process of the armature 110 and the second bracket 120 is made more stable, and the connection strength of the second bracket 120 is improved. During installation, it is convenient for the armature 110 to slide into the second U-shaped portion 121 and position relatively, which is convenient for installation. In addition, the setting positions of the limit block 520 and the embedded groove 510 are opposite to the operating space of the staff on the frame 1010, which improves the aesthetics.

[0048] In a specific embodiment, the limit blocks 520 disposed on both sides of the second U-shaped portion 121 are wrapped around two opposite arms of the first U-shaped portion 310. When the armature 110 swings forward to reset, the side wall of the embedded groove 510 can push the limit blocks 520 to rotate with the armature 110. When the armature 110 swings backward, the bottom of the embedded groove 510 can simultaneously push the limit blocks 520 to rotate together with the armature 110. The embedded groove 510 of this embodiment is disposed on the rear side of the first U-shaped portion 310, wherein the embedded groove 510 extends to the rear side of the opposite arms of the first U-shaped portion 310 and the outer bottom surface of the first U-shaped portion 310, so as to facilitate the embedding of the limit blocks 520. In addition, the embedding groove 510 can be set on the outer side wall, outer bottom surface, or front side wall of the first U-shaped portion 310, and the limit block 520 extends into the embedding groove 510 accordingly. When the armature 110 rotates, the limit block 520 can contact the side wall of the embedding groove 510 to receive the thrust of the armature 110.

[0049] Furthermore, one end of the shifting member 122 away from the second U-shaped portion 121 is bent forward in an arc shape.

[0050] Specifically, the dial 122 is curved and can fit the shape of the traction rod 210, making it easy to push the traction rod 210, and the curved dial 122 can better avoid the position of the operating system 1012, making it easy to install. The dial 122 in this embodiment respectively contacts the traction rod 210 with its outer curved surface and the end, thereby increasing the force on the parts and reducing damage to the parts, and the dial 122 contacts the traction rod 210 with its width surface, thereby increasing the contact area and improving the strength of the dial 122. In addition, the dial 122 can be a component formed by bending the second U-shaped portion 121, or can be fixed to the second U-shaped portion 121 by welding, screw connection, etc., and the dial 122 can also extend in a straight line, etc., and there is no restriction on the shape of the dial 122.

[0051] Furthermore, the first bracket 100 includes a third U-shaped portion 630, and the armature 110 and the magnetic member 130 are both located in the third U-shaped portion 630. The armature 110 and the magnetic member 130 are both rotatably connected to the first bracket 100 and form a component, which is easy to install, and the first bracket 100 is located on the outside of the armature 110 and the magnetic member 130. The first bracket 100 supports and protects the armature 110 and the magnetic member 130, and the structure is firm, which improves the disconnection reliability of the circuit breaker. In fact, the armature 110 and the magnetic member 130 are located in the third U-shaped portion 630, which can mean that they are completely in the space surrounded by the third U-shaped portion 630, or partially in the space surrounded by the third U-shaped portion 630.

[0052] Furthermore, the third U-shaped portion 630 is connected to a rotating shaft 150 on two opposite sides, and the armature 110 is rotatably connected to the rotating shaft 150; the second bracket 120 includes a second U-shaped portion 121, and the second bracket 120 is rotatably connected to the rotating shaft 150 on two opposite sides, and the opening of the second U-shaped portion 121 is opposite to the opening of the third U-shaped portion 630.

[0053] Specifically, the armature 110, the magnetic member 130 and the second bracket 120 are all located between the opposite sides of the third U-shaped portion 630, so that the first bracket 100 plays a supporting and protective role, which is convenient for installation. The armature 110 and the second bracket 120 are both rotatably connected to the rotating shaft 150, so that the rotation axes of the armature 110 and the second bracket 120 coincide with each other, which facilitates the surfaces of the first bracket 100 and the armature 110 that are in contact with each other to always be relatively still, and the first bracket 100 and the armature 110 are kept in synchronous rotation, which is convenient for spatial layout design and low cost. Moreover, the U-shaped opening of the third U-shaped portion 630 of the first bracket 100 and the U-shaped opening of the second U-shaped portion 121 of the second bracket 120 are opposite to each other, forming an installation space, so that the armature 110 and the magnetic member 130 can be set in the installation space, and at the same time, the braid wire 1050 of the moving contact can pass through, thereby avoiding the armature 110 and the braid wire 1050 touching each other and affecting the action characteristics of the armature 110. In fact, the armature 110 and the second bracket 120 may be connected by respectively providing pins on the two opposite sides of the third U-shaped portion 630 .

[0054] In this embodiment, the first U-shaped portion 310 of the armature 110 has connecting holes on opposite sides for the rotation shaft 150 to pass through, and the second U-shaped portion 121 of the second bracket 120 also has connecting holes on opposite sides for the rotation shaft 150 to pass through. In addition, the second bracket 120 may also be located outside the third U-shaped portion 630.

[0055] Further, the armature 110 includes a first U-shaped portion 310, the magnetic member 130 includes a fourth U-shaped portion 640, and the opening of the first U-shaped portion 310 is opposite to the opening of the fourth U-shaped portion 640. Specifically, the armature 110 and the magnetic member 130 both have a U-shaped structure, which can more easily form a closed magnetic field, improve the magnetic field strength, and thus improve the response accuracy, and can avoid the passage of the braid 1050, so as to prevent the armature 110 and the braid 1050 from touching each other and affecting the action characteristics of the armature 110.

[0056] Furthermore, the magnetic member 130 is fixed to the first bracket 100 by screws. Specifically, the screw connection can improve the connection stability of the magnetic member 130, thereby reducing the movement or falling off of the magnetic member 130 relative to the first bracket 100 during the breaking test, thereby improving the reliability of the circuit breaker breaking. In addition, the magnetic member 130 and the first bracket 100 can also be fixed by overfitting or other methods.

[0057] Further, see Figure 6 The armature 110 is provided with a first engaging inclined surface 530, and the magnetic member 130 is provided with a second engaging inclined surface 540, and the first engaging inclined surface 530 is opposite to the second engaging inclined surface 540. Specifically, when a magnetic attraction force is formed between the magnetic member 130 and the armature 110, the armature 110 rotates and makes the first engaging inclined surface 530 and the second engaging inclined surface 540 fit each other, thereby achieving a rotation-stopping effect.

[0058] Reference Figure 7 , a rotating shaft 150 is provided on the first bracket 100, the armature 110 and the second bracket 120 are both rotatably connected to the rotating shaft 150, the elastic reset member 140 is a torsion spring 600, the torsion spring 600 is sleeved on the rotating shaft 150, and a first torsion arm 610 and a second torsion arm 620 are extended from both ends of the torsion spring 600, the first torsion arm 610 abuts against the armature 110, and the second torsion arm 620 abuts against the magnetic member 130. Specifically, the torsion spring 600 is sleeved on the rotating shaft 150, and the rotating shaft 150 provides support for the torsion spring 600 to improve the stability of the torsion spring 600. When the armature 110 rotates relative to the first bracket 100, the first torsion arm 610 abutting against the armature 110 and the second torsion arm 620 abutting against the magnetic member 130 move accordingly, that is, the torsion spring 600 is tensioned, which is convenient for connection and installation.

[0059] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the utility model disclosed herein. The present application is intended to cover any deformation, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary technical means in the art that are not disclosed in the present application. The specification and examples are considered to be exemplary only, and the true scope and spirit of the present application are indicated by the appended claims.

Claims

1. A circuit breaker, characterized in that: include: Frame; A traction rod, rotatably connected to the frame; A first backup protection structure and a second backup protection structure are separately arranged, and the first backup protection structure and the second backup protection structure are arranged on the frame; The third backup protection structure is arranged on the frame and is located between the first backup protection structure and the second backup protection structure. The first backup protection structure, the second backup protection structure and the third backup protection structure are all against the traction rod. The first backup protection structure, the second backup protection structure and the third backup protection structure are all configured to push the traction rod so that the traction rod rotates back and forth relative to the frame.

2. The circuit breaker according to claim 1, characterized in that: The frame body includes a base frame and an operating system, the first backup protection structure, the second backup protection structure and the third backup protection structure are all arranged on the base frame, the third backup protection structure has a pushing end capable of pushing the traction rod to rotate, the operating system is arranged on the base frame and facing the pushing end of the third backup protection structure, and the traction rod is rotatably connected to the operating system; and / or At least three installation cavities are arranged side by side and at intervals on the frame, and the first backup protection structure, the second backup protection structure and the third backup protection structure are arranged one-to-one in the installation cavities respectively.

3. The circuit breaker according to claim 1, characterized in that: At least one of the first backup protection structure, the second backup protection structure, and the third backup protection structure comprises: A first bracket, disposed on the frame; an armature, rotatably connected to the first bracket; A second bracket is rotatably connected to the first bracket, and the second bracket is connected to or abuts against the armature, so that the second bracket and the armature rotate synchronously relative to the first bracket; A magnetic member, disposed on the first bracket, configured to generate a magnetic force to drive the armature to rotate relative to the first bracket; An elastic reset member has one end connected to the first bracket or the magnetic member, and the other end connected to the armature or the second bracket.

4. The circuit breaker according to claim 3, characterized in that: The armature includes a first U-shaped portion; The second bracket includes a second U-shaped portion and a shifting member. The opposite sides of the second U-shaped portion are rotatably connected to the first bracket. The inner bottom surface of the second U-shaped portion is in contact with the outer bottom surface of the first U-shaped portion. The shifting member is arranged on the outer bottom surface of the second U-shaped portion.

5. The circuit breaker according to claim 4, characterized in that: An embedding groove is provided on the side surface of the armature, and limiting blocks extending in opposite directions are provided on the side edges of the second U-shaped portion, and the limiting blocks extend into the embedding groove.

6. The circuit breaker according to claim 5, characterized in that: The first U-shaped portion and the second U-shaped portion both construct a space that runs through the front and back, the limit block is arranged on the rear side of the second U-shaped portion, the embedding groove is arranged on the rear side of the armature, the magnetic member is configured to drive the armature to swing backward relative to the first bracket by generating a magnetic force, and the elastic reset member is configured to provide a reset force for the armature to swing forward and reset.

7. The circuit breaker according to claim 4 or 5, characterized in that: One end of the shifting member away from the second U-shaped portion is bent forward in an arc shape.

8. The circuit breaker according to claim 3, characterized in that: The first bracket includes a third U-shaped portion, and the armature and the magnetic member are both located in the third U-shaped portion.

9. The circuit breaker according to claim 8, characterized in that Two opposite sides of the third U-shaped portion are connected with a rotating shaft, and the armature is rotatably connected to the rotating shaft; The second bracket includes a second U-shaped portion, two opposite sides of the second bracket are rotatably connected to the rotating shaft, and an opening of the second U-shaped portion is opposite to an opening of the third U-shaped portion.

10. The circuit breaker according to claim 3, characterized in that The armature includes a first U-shaped portion, the magnetic member includes a fourth U-shaped portion, and an opening of the first U-shaped portion is opposite to an opening of the fourth U-shaped portion; and / or The magnetic member is screwed to the first bracket; and / or The armature is provided with a first attraction slope, the magnetic member is provided with a second attraction slope, the first attraction slope is opposite to the second attraction slope; and / or The first bracket is provided with a rotating shaft, the armature and the second bracket are both rotatably connected to the rotating shaft, the elastic reset member is a torsion spring, the torsion spring is sleeved on the rotating shaft, a first torsion arm and a second torsion arm are extended from both ends of the torsion spring, the first torsion arm abuts against the armature, and the second torsion arm abuts against the magnetic member; and / or The second bracket is against the traction rod. When the armature rotates back and forth relative to the first bracket, the second bracket can be driven to push the traction rod, so that the traction rod rotates back and forth relative to the frame.

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