Circuit breaker

Abstract

The circuit breaker comprises a shell, an operating system and a tripping mechanism, the operating system and the tripping mechanism are arranged in the shell, a tripping interlocking assembly is arranged between a handle assembly of the operating system and an electromagnetic tripper of the tripping mechanism in a linkage mode, and the electromagnetic tripper comprises an ejector rod. The ejector rod faces the tripping interlocking assembly and is driven by the electromagnetic tripper to trigger the tripping interlocking assembly to be unlocked, the tripping interlocking assembly pushes the ejector rod to reset when resetting, and the operating system further comprises a buffer elastic piece; the buffer elastic member elastically abuts against one side of the electromagnetic release deviating from the push rod and is used for buffering impact when the push rod is reset. According to the invention, the operating system is internally provided with the buffer elastic member, and the buffer elastic member elastically abuts against one side, deviating from the push rod, of the electromagnetic release and is used for buffering the impact when the push rod is reset, thereby reducing the damage to the electromagnetic release when the push rod is reset, and avoiding the failure of the electromagnetic release.

Description

Technical Field

[0001] The invention relates to the field of low-voltage electrical appliances, and in particular to a circuit breaker. Background Art

[0002] Residual current operated circuit breakers are divided into electromagnetic and electronic types according to the working voltage. The working principle of electromagnetic residual current circuit breakers has nothing to do with the working power supply. The product tripping is unlocked by the electromagnetic release direct driving mechanism. Therefore, the mechanical and electrical life of the electromagnetic residual current circuit breaker is closely related to the product operating mechanism and the performance of the electromagnetic release. However, since the input current of the electromagnetic release is at the milliampere level, the magnetic conductive material inside the electromagnetic release needs to have a high magnetic permeability and low coercive force. The magnetic conductive material usually uses a soft magnetic nickel alloy, but due to the low hardness of the material, it is easy to be damaged. When the product mechanism is in the process of opening and closing, the top rod will hit the electromagnetic release when it quickly resets. After a certain number of uses, the electromagnetic release suction surface is often damaged, and the electromagnetic release fails, resulting in the problem of unqualified mechanical and electrical life of the residual current operated circuit breaker. Summary of the invention

[0003] The object of the present invention is to overcome at least one defect of the prior art and provide a circuit breaker with simple structure and high reliability.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A circuit breaker comprises a shell, an operating system and a tripping mechanism arranged in the shell, a tripping interlocking assembly being linked between a handle assembly of the operating system and an electromagnetic tripper of the tripping mechanism, the electromagnetic tripper comprising a push rod, the push rod facing the tripping interlocking assembly is driven by the electromagnetic tripper to trigger the tripping interlocking assembly to be unlocked, and the push rod is pushed to reset when the tripping interlocking assembly is reset, and the operating system also comprises a buffer elastic member, the buffer elastic member is elastically abutted against a side of the electromagnetic tripper away from the push rod to buffer the impact when the push rod is reset.

[0006] Preferably, the buffer elastic member is a torsion spring, and the handle assembly includes a handle body and a return spring. The buffer elastic member, the return spring and the handle body are coaxially rotatably assembled, one elastic end of the return spring and the first elastic arm of the buffer elastic member are respectively abutted against the handle body, the other elastic end of the return spring is fixed in the outer shell, and the second elastic arm of the buffer elastic member is elastically abutted against the side of the electromagnetic release away from the top rod.

[0007] Preferably, the second elastic arm extends along an outer surface of the electromagnetic release on a side facing away from the ejector rod.

[0008] Preferably, the rotation axis of the handle body is correspondingly located between the push rod and the second elastic arm.

[0009] Preferably, the electromagnetic release comprises a housing, one side of the housing is slidably equipped with a push rod, one end of the push rod is arranged opposite to the tripping interlocking assembly, and the other end of the push rod is opposite to the armature of the electromagnetic release.

[0010] Preferably, the electromagnetic release is slidably assembled between the buffer elastic member and the release interlocking assembly.

[0011] Preferably, an assembly structure is provided between the electromagnetic release and an adjacent shell side wall or a partition provided in the shell, and the assembly structure includes a sliding groove and a sliding part that slidably cooperate with each other, or the assembly structure includes a mounting protrusion and a mounting groove that cooperate with each other.

[0012] Preferably, the assembly structure includes a mounting protrusion and a mounting groove that cooperate with each other, the inner diameter of the mounting groove is larger than the outer diameter of the mounting protrusion so that a buffer gap is reserved in the mounting groove, and when the push rod is reset, the mounting protrusion moves in the mounting groove through the buffer gap.

[0013] Preferably, the buffer elastic member is arranged on a side of the electromagnetic release device facing away from the top rod, one end of the elastic buffer member is fixed in the housing, and the other end is connected to a side of the electromagnetic release device facing away from the top rod.

[0014] Preferably, the operating system further comprises a fixed plate and a connecting rod assembly, wherein the connecting rod assembly is linkedly connected between the handle assembly and the trip interlock assembly, and the handle assembly, the connecting rod assembly and the trip interlock assembly are all rotatably assembled on the fixed plate.

[0015] Preferably, the release interlocking assembly includes a pushing member, a jump catch, a first lock catch and a second lock catch. The pushing member and the jump catch are respectively rotatably assembled on the same side of the handle assembly, and the first lock catch and the second lock catch are respectively rotatably assembled on the other side of the handle assembly. One end of the pushing member is opposite to the top rod, and the other end of the pushing member is snap-fitted with the second lock catch, one end of the jump catch is snap-fitted with the first lock catch, and the other end of the jump catch is snap-fitted with the connecting rod assembly.

[0016] Preferably, the connecting rod assembly includes a lever and a connecting rod, the lever and the jump catch are arranged on the same side of the handle assembly, and the lever abuts the jump catch, one end of the connecting rod is connected to the handle assembly, and the other end of the connecting rod is linked to the lever and abuts the jump catch.

[0017] Preferably, it also includes at least one contact unit, which includes a pair of wiring terminals and a contact mechanism, the pair of wiring terminals are arranged at both ends of the shell at intervals along a first direction, the contact mechanism is located between the pair of wiring terminals, the contact mechanism includes a moving contact and a static contact that cooperate with each other, the moving contact of at least one contact unit is linked to the operating system, the operating system and the tripping mechanism are arranged in the shell along a second direction, and the first direction is perpendicular to the second direction.

[0018] The circuit breaker of the present invention has a buffer elastic member in the operating system, which elastically abuts against the side of the electromagnetic release away from the top rod to buffer the impact when the top rod is reset, thereby reducing damage to the electromagnetic release when the top rod is reset and avoiding failure of the electromagnetic release.

[0019] In addition, the buffer elastic member is a torsion spring, which has the advantages of simple structure, convenient assembly and low cost.

[0020] In addition, the handle body corresponds to between the second elastic member and the push rod, so that a reasonable matching structure is formed among the buffer elastic member, the handle body and the electromagnetic release.

[0021] In addition, a mounting structure is provided between the shell of the electromagnetic release and the adjacent partition and / or the adjacent shell side wall, wherein the mounting groove reserves a buffer gap for the movement of the mounting boss, thereby cooperating with the buffer elastic member to buffer the impact when the top rod is reset.

[0022] In addition, the fixed plate of the operating system is used to rotate and assemble the handle assembly, the connecting rod assembly and the tripping interlock assembly, so that the operating system forms a modular structure for easy assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the operating system, electromagnetic release and contact unit in the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the operating system and the buffer elastic member in the present invention;

[0025] Figure 3 It is a schematic diagram of the structure of the handle assembly and the buffer elastic member in the present invention;

[0026] Figure 4 It is a schematic diagram of the structure of the handle body, the return spring and the buffer elastic member in the present invention;

[0027] Figure 5 It is a structural schematic diagram of the operating system, electromagnetic release and moving contact in the present invention;

[0028] Figure 6 It is a structural schematic diagram of the operating system and the moving contact in the present invention;

[0029] Figure 7 It is a schematic diagram of the structure of the operating system of the present invention after the fixing plate is removed;

[0030] Figure 8 It is a schematic diagram of the external structure of the electromagnetic release in the present invention;

[0031] Fig. 9 yes Figure 8 A schematic diagram of the matching between the middle mounting groove and the mounting protrusion;

[0032] Reference numerals:

[0033] 1-operating system, 10-fixing plate, 11-handle assembly, 111-handle body, 112-reset spring, 12-connecting rod assembly, 121-connecting rod, 122-lever, 131-pushing member, 132-jump buckle, 133-first lock buckle, 134-second lock buckle, 14-buffer elastic member, 141-first elastic arm, 142-second elastic arm, 2-electromagnetic release, 21-housing, 22-top rod, 23-mounting groove, 3-contact unit, 31-connecting terminal, 32-moving contact, 41-partition, 42-mounting protrusion, a-buffer gap. DETAILED DESCRIPTION

[0034] The specific implementation of the circuit breaker of the present invention is further described below in conjunction with the embodiments given in the accompanying drawings. The circuit breaker of the present invention is not limited to the description of the following embodiments.

[0035] The circuit breaker includes a shell, an operating system 1 and a tripping mechanism are arranged in the shell, and at least one contact unit 3 driven by the operating system 1 is also arranged in the shell, wherein the operating system 1 includes a handle assembly 11, a connecting rod assembly 12 and a tripping interlock assembly which are linked and connected in sequence, the handle assembly 11 is rotatably arranged in the shell, one end of the handle assembly 1 extends out of the shell from a handle hole provided in the shell, and is used to manually drive the operating system 1 to perform opening and closing actions; the tripping mechanism includes a control circuit board and an electromagnetic release 2 and a mutual inductor connected to the control circuit board, the mutual inductor is connected to the main line of each contact unit 3 and is used to feed back the collected current signal to the control circuit board, the top rod 22 of the electromagnetic release 2 faces the tripping interlock assembly, the controller of the control circuit board outputs a control signal according to the current signal to drive the electromagnetic release 2, when the electromagnetic release 2 is driven, the top rod 22 triggers the tripping interlock assembly to unlock, the operating system 1 is tripped, thereby driving the contact unit 3 to open, and when the tripping interlock mechanism is locked again, the tripping interlock mechanism pushes the top rod 22 to reset.

[0036] The operating system 1, the tripping mechanism and the contact unit 3 can adopt the existing technology, wherein the tripping mechanism can also include a test button and a test circuit, wherein the test circuit draws power from at least one main line and passes through a transformer, and the test button is slidably assembled on the housing for connecting or disconnecting the test circuit.

[0037] The improvement of the present application is that the operating system 1 also includes a buffer elastic member 14, which elastically abuts against the side of the electromagnetic release 2 away from the top rod 22 to buffer the impact of the top rod 22 when it is reset. In this way, the impact damage to the electromagnetic release 2 when the top rod 22 is reset can be reduced, thereby avoiding failure of the electromagnetic release 2.

[0038] Furthermore, the electromagnetic release 2 is slidably assembled between the buffer elastic member 14 and the trip interlocking assembly. Specifically, a mutually matching assembly structure is arranged between the electromagnetic release 2 and the adjacent side wall of the shell or a fixed area arranged in the shell (for example, a partition arranged in the shell). The assembly structure includes a sliding groove and a sliding part that slidably cooperate, or an installation groove 23 and an installation protrusion 42, but a certain buffer gap a needs to be reserved between the installation groove 23 and the installation protrusion 42, so that the buffering effect is further improved by moving the electromagnetic release 2 a certain distance.

[0039] Preferably, the buffer elastic member 14 is a torsion spring, and the buffer elastic member 14 is coaxially assembled with the handle assembly 11, which has the advantages of simple structure, low cost and convenient assembly. Specifically, the handle assembly 11 includes a handle body 111 and a reset spring 112. The buffer elastic member 14, the reset spring 112 and the handle body 111 are coaxially rotated and assembled. The reset spring 112 is used to drive the handle body 111 to reset. The buffer elastic member 14 is used to buffer the impact of the push rod 22 when it is reset. One elastic end of the reset spring 112 and the first elastic arm 141 of the buffer elastic member 14 are respectively abutted against the handle body 111, and the other elastic end of the reset spring 112 is fixed in the outer shell and can also abut against other components in the outer shell. The second elastic arm 142 of the buffer elastic member 14 elastically abuts against the side of the electromagnetic release 2 away from the push rod 22.

[0040] Of course, the buffer elastic member 14 can also be arranged on the side of the electromagnetic release 2 away from the top rod 22. One end of the buffer elastic member 14 is fixed in the outer shell, and the other end is elastically abutted or connected to the side of the electromagnetic release 2 away from the top rod 22. The elastic deformation direction of the buffer elastic member 14 is preferably consistent with the moving direction of the electromagnetic release 2. At this time, the buffer elastic member 14 can be a spring.

[0041] Combination Figure 1-9 A specific embodiment of a circuit breaker is provided.

[0042] The circuit breaker includes a shell, in which an operating system 1, a tripping mechanism and at least one contact unit 3 are arranged. The shell includes a base and a cover body covering the base. At least one pair of wiring holes are provided at opposite ends of the base, and the connection direction between each pair of wiring holes is a first direction. Two directions perpendicular to the first direction are respectively a second direction and a third direction, and the second direction is perpendicular to the third direction. In this embodiment, when two or more pairs of wiring holes are provided at opposite ends of the base, two adjacent pairs of wiring holes are arranged in parallel along the second direction, and a contact unit 3 is arranged between each pair of wiring holes. In this embodiment, two contact units 3 arranged in parallel in the second direction are provided in the shell as an example, and the cover body covers the base along the third direction.

[0043] like Figure 1 , 2 As shown, a partition 41 is provided in the shell, and the partition 41 divides the space in the shell into two installation cavities parallel in the second direction, and a contact unit 3 is provided in each installation cavity. The tripping mechanism includes an electromagnetic release 2, and the operating system 1 and the electromagnetic release 2 are arranged side by side in the shell along the second direction, that is, the operating system 1 and the electromagnetic release 2 share a mounting cavity with a contact unit 3 respectively.

[0044] like Figure 3-7 As shown, in this embodiment, the operating system 1 includes a fixing plate 10, on which a handle assembly 11, a connecting rod assembly 12 and a tripping interlock assembly are rotatably mounted, respectively, so that the operating system 1 forms a modular structure, which is convenient for assembling the operating system 1 in a housing; specifically, Figure 3 , 4 As shown, the handle assembly 11 includes a handle body 111 and a return spring 112, wherein the rotating portion of the handle body 111 is rotatably assembled on one side of the fixed plate 10, and a receiving groove is provided on the side of the rotating portion facing away from the fixed plate 10, and the return spring 112 is arranged in the receiving groove and coaxially assembled with the handle body 111, one elastic end of the return spring 112 abuts against the inner wall of the receiving groove, and the other end of the return spring 112 extends out of the receiving groove and abuts against other components in the outer shell; the handle portion of the handle body 111 extends from the handle hole opened in the cover body to the outside of the outer shell, which is used for manually operating the handle assembly 11 to rotate.

[0045] The connecting rod assembly 12 includes a connecting rod 121 and a lever 122. Figure 6The middle connecting rod 121 is a U-shaped rod body as a whole, one end of the connecting rod 121 is connected to the handle body 111, and the lever 122 is rotatably assembled on the fixed plate 10, and in the first direction, the lever 122 is located on one side of the handle assembly 11; the release interlocking assembly includes a pushing member 131, a jump buckle 132, a first lock buckle 133 and a second lock buckle 134, in the first direction, the pushing member 131 and the jump buckle 132 are respectively rotatably assembled on the fixed plate 10 on the same side of the handle assembly 11, the first lock buckle 133 and the second lock buckle 134 are respectively rotatably assembled on the fixed plate 10 on the other side of the handle assembly 11, wherein the jump buckle 132 and the lever 122 are located on the same side of the handle assembly 11, and the jump buckle 132 abuts against the lever 122, the other end of the connecting rod 121 is linked to the lever 122 and the middle part of the lever 122 can abut against the jump buckle 132, In the third direction, the pushing member 131 and the second lock buckle 134 are closer to the cover body, and the first lock buckle 133 and the jump buckle 132 are closer to the base, wherein the end of the jump buckle 132 adjacent to the first lock buckle 133 is snap-fitted between the partition 41 and the fixed plate 10 to form a first snap-fit ​​structure, and the end of the pushing member 131 away from the fixed plate 10 passes through the partition 41 as a pushing part and extends into another assembly cavity for being opposite to the top rod 22 of the electromagnetic releaser 2, a first boss is protruding from the middle part of the pushing member 131, and a second boss is provided at one end of the second lock buckle 134, the first boss and the second boss are snap-fitted between the fixed plate 10 and the partition 41 to form a second snap-fit ​​structure, and in the third direction, the second snap-fit ​​structure is located between the first snap-fit ​​structure and the handle assembly 11, and the other end of the second lock buckle 134 is engaged with the other end of the first lock buckle 133. When the first buckle structure and the second buckle structure are in a buckle-fitted state, the operating system 1 is in a stable state as a whole, and the operating handle assembly 11 can drive the contact unit 3 to perform normal opening and closing.

[0046] like Figure 1 , 5 As shown in Figure 8, the electromagnetic release 2 includes a shell 21, in which at least a coil assembly, an armature and a magnetic conductive member for forming a magnetic circuit between the coil assembly and the armature are installed. The coil assembly is connected to a control circuit board, and a controller of the control circuit board outputs a control signal to energize or de-energize the coil assembly, and the armature is driven by the coil assembly to swing in the shell 21. Preferably, the armature is also connected to a reset member, and the armature is driven by the reset member to rotate and reset; a push rod 22 is slidably installed on one side of the shell 21, and one end of the push rod 22 located in the shell 21 cooperates with the armature, and one end of the push rod 22 located outside the shell 21 is opposite to the push member 131 in the trip interlocking assembly, that is, the push rod 22 is opposite to the push part.

[0047] The cooperation principle between the electromagnetic release 2 and the operating system 1 is:

[0048] When the coil assembly is energized, it drives the armature to move, and the armature drives the push rod 22 to move out of the shell 21 and push the pushing member 131 to rotate in the tripping direction. The rotation of the pushing member 131 causes the second boss to rotate in the tripping direction, and the second boss is separated from the first boss, so that the second buckle structure collapses. At the same time, the rotation of the second lock buckle 134 drives the first lock buckle 133 to rotate, thereby causing the buckle cooperation between the first lock buckle 133 and the jump buckle 132 to collapse, that is, the first buckle structure collapses, and the jump buckle 132 loses balance and drives the lever 122 and the handle assembly 11 to move in the opening direction. At this time, the operating mechanism is tripped, and the contact unit 3 is opened and powered off; when the coil assembly loses power, the reset member drives the armature to reset, and the reset of the push rod 22 is driven by the operating system 1, that is, after the tripping interlocking assembly re-forms the first buckle structure and the second buckle structure, the operating handle assembly 11 rotates in the closing direction, and the pushing portion of the pushing member 131 pushes the push rod 22 to reset.

[0049] like Figure 1-4 , 8 and 9, the operating system 1 also includes a buffer elastic member 14. In the present embodiment, the buffer elastic member 14 is a torsion spring, and the torsion portion of the torsion spring is coaxially assembled with the handle assembly 11. Preferably, the torsion portion and the reset spring 112 are coaxially assembled in the receiving groove of the handle body 111, and the two ends of the torsion portion respectively extend radially outwardly along the torsion portion to form a first elastic arm 141 and a second elastic arm 142, wherein the first elastic arm 141 abuts against the receiving groove, and the second elastic arm 142 extends out of the receiving groove and elastically abuts against a side of the electromagnetic release 2 away from the top rod 22. When the electromagnetic release 2 is not driven, the second elastic arm 142 of the buffer elastic member 14 The elastic contact with the electromagnetic release 2 makes the push rod 22 fit closely with the push part of the push member 131. At this time, the second elastic arm 142 can apply a certain elastic force to the electromagnetic release 2, thereby ensuring the coordination stability between the push rod 22 and the operating system 1. When the push rod 22 is driven to reset by the push member 131, the impact generated during the reset of the push rod 22 drives the electromagnetic release 2 and drives the buffer elastic member 14 to undergo elastic deformation. The electromagnetic release 2 moves slightly away from the push member 131 to buffer the impact force, and then the second elastic arm 142 drives the electromagnetic release 2 back to its original position, so that the push rod 22 fits with the push member 131. Of course, as other embodiments, the buffer elastic member 14 can also be other elastic members.

[0050] The electromagnetic release 2 is slidably assembled between the buffer elastic member 14 and the trip interlocking assembly. In this embodiment, the electromagnetic release 2 is slidably assembled between the second elastic arm 142 and the push member 131. An assembly structure is provided between the housing 21 and the adjacent partition 41 and / or the adjacent housing side wall. The assembly structure includes a mounting protrusion 42 and a mounting groove 23 that cooperate with each other. Preferably, the mounting protrusion 42 is protruding and arranged on the outer surface of the housing 21, and the mounting groove 23 is opened on the adjacent partition 41 and / or the adjacent housing side wall. The mounting groove 23 is pre- A buffer gap a is left so that the inner diameter of the mounting groove 23 is larger than the outer diameter of the mounting protrusion 42. The buffer elastic member 14 can apply elastic force to the electromagnetic release 2 so that the electromagnetic release 2 rests against one side of the mounting protrusion 23. When the push rod 22 is reset, the mounting protrusion 42 can move in the mounting groove 23. At this time, the electromagnetic release 2 moves to the other side of the mounting protrusion 42, that is, the electromagnetic release 2 moves slightly away from the push member 131 in this process. At the same time, the buffer elastic member 14 is squeezed to finally achieve buffering. Of course, the mounting protrusion 42 can also be set on the adjacent partition 41 and / or the adjacent side wall of the shell, and the mounting groove 23 is opened on the shell 21 of the electromagnetic release 2. Figure 8 , 9 As shown, both the mounting protrusion 42 and the mounting groove 23 are circular. Of course, the shapes of the mounting protrusion 42 and the mounting groove 23 are not limited to circular.

[0051] In addition, the assembly structure may also include a sliding groove and a sliding part that are slidably matched. The sliding part is protruded on the adjacent partition 41 and / or the adjacent side wall of the shell. The sliding groove is matched and opened on the outer surface of the shell 21. The central axis of the sliding groove is a straight line, so that the sliding part moves along a straight line in the sliding groove. The buffering elastic part 14 can apply elastic force to the electromagnetic release 2. When the electromagnetic release 2 drives the operating system to release, the sliding part is located on one side of the sliding groove. When the push rod 22 is reset, the sliding part moves to the other side of the sliding groove. At the same time, the buffering elastic part 14 is squeezed to finally achieve buffering.

[0052] In this embodiment, in the first direction, the rotation axis of the handle body 111 is located between the push rod 22 and the second elastic arm 142, so that the second elastic arm 142 extends along the outer surface of the electromagnetic release 2 away from the push rod 22. Figure 1-4 In the embodiment, the second elastic arm 142 extends from the accommodating groove, extends roughly along the first direction, bends along the second direction and fits the outer surface of the shell 21, so that the second elastic arm 142 elastically abuts against the shell 21, so that a reasonable matching structure is formed between the buffer elastic member 14, the handle body 111 and the electromagnetic release 2.

[0053] like Figure 1 , 5-7, each contact unit 3 includes a pair of wiring terminals 31 and a contact mechanism, wherein the pair of wiring terminals 31 are spaced apart in a first direction, each wiring terminal 31 corresponds to a wiring hole in the assembly cavity respectively, and the contact mechanism is arranged between the pair of wiring terminals 31, and the contact mechanism includes a movable contact 32 and a stationary contact that cooperate with each other, and the movable contact 32 is linked to the operating system 1, that is, the movable contact 32 is connected to the lever 122, and the stationary contact is fixedly arranged in the assembly cavity and connected to a wiring terminal 31, and the movable contacts 32 of the two contact units 3 are linked to each other, and the linkage connection can be provided with two mounting parts on the lever 122, and each mounting part is respectively connected to a movable contact 32, or, the two movable contacts 32 are linked to each other through a linkage shaft, and the linkage of the movable contacts 32 of the two contact units 3 can adopt the existing technology.

[0054] In addition, the control circuit board, mutual inductor, test button and test loop are arranged in the shell, and the assembly position thereof can adopt the existing technology.

[0055] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the accompanying drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0056] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A circuit breaker, comprising a housing, an operating system (1) and a tripping mechanism arranged in the housing, wherein a tripping interlocking assembly is provided in linkage between a handle assembly (11) of the operating system (1) and an electromagnetic tripping device (2) of the tripping mechanism, wherein the electromagnetic tripping device (2) comprises a push rod (22), wherein the push rod (22) faces the tripping interlocking assembly and the electromagnetic tripping device (2) drives the push rod (22) to trigger the tripping interlocking assembly to be unlocked, and when the tripping interlocking assembly is reset, the push rod (22) is pushed to reset, wherein: The operating system (1) further comprises a buffer elastic member (14), wherein the buffer elastic member (14) elastically abuts against a side of the electromagnetic release (2) facing away from the push rod (22) to buffer the impact of the push rod (22) when it is reset.

2. The circuit breaker according to claim 1, characterized in that: The buffer elastic member (14) is a torsion spring, and the handle assembly (11) comprises a handle body (111) and a reset spring (112). The buffer elastic member (14), the reset spring (112) and the handle body (111) are coaxially rotatably assembled, one elastic end of the reset spring (112) and a first elastic arm (141) of the buffer elastic member (14) respectively abut against the handle body (111), the other elastic end of the reset spring (112) is fixed in the housing, and the second elastic arm (142) of the buffer elastic member (14) elastically abuts against a side of the electromagnetic release (2) that is away from the top rod (22).

3. The circuit breaker according to claim 2, characterized in that: The second elastic arm (142) extends along the outer surface of the electromagnetic release (2) on a side facing away from the top rod (22).

4. The circuit breaker according to claim 2 or 3, characterized in that: The rotation axis of the handle body (111) is correspondingly located between the top rod (22) and the second elastic arm (142).

5. The circuit breaker according to claim 1, characterized in that: The electromagnetic release (2) comprises a housing (21), one side of the housing (21) is slidably equipped with a push rod (22), one end of the push rod (22) is arranged opposite to the release interlocking assembly, and the other end of the push rod (22) is opposite to the armature of the electromagnetic release (2).

6. The circuit breaker according to claim 1, characterized in that: The electromagnetic release (2) is slidably assembled between the buffer elastic member (14) and the release interlocking assembly.

7. The circuit breaker according to claim 6, characterized in that: An assembly structure is provided between the electromagnetic release (2) and an adjacent housing side wall or a partition (41) provided in the housing, wherein the assembly structure comprises a sliding groove and a sliding portion that slidably cooperate with each other, or the assembly structure comprises a mounting protrusion (42) and a mounting groove (23) that cooperate with each other.

8. The circuit breaker according to claim 6, characterized in that: The assembly structure comprises a mounting protrusion (42) and a mounting groove (23) which cooperate with each other. The inner diameter of the mounting groove (23) is larger than the outer diameter of the mounting protrusion (42) so that a buffer gap (a) is reserved in the mounting groove (23). When the ejector rod (22) is reset, the mounting protrusion (42) moves in the mounting groove (23) through the buffer gap (a).

9. The circuit breaker according to claim 6, 7 or 8, characterized in that: The buffer elastic member (14) is arranged on the side of the electromagnetic release (2) facing away from the top rod (22); one end of the elastic buffer member (14) is fixed in the housing, and the other end is connected to the side of the electromagnetic release (2) facing away from the top rod (22).

10. The circuit breaker according to claim 1, characterized in that: The operating system (1) further comprises a fixed plate (10) and a connecting rod assembly (12); the connecting rod assembly (12) is linked and connected between the handle assembly (11) and the tripping interlock assembly; the handle assembly (11), the connecting rod assembly (12) and the tripping interlock assembly are all rotatably mounted on the fixed plate (10).

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