Circuit breaker

Abstract

The circuit breaker comprises a shell, a rotating shaft system and an operating mechanism, the rotating shaft system and the operating mechanism are installed in the shell, the operating mechanism comprises a support, a rocker arm assembly, an energy storage spring, a hasp mechanism and a connecting rod mechanism, the rotating shaft system is provided with at least one moving contact, the connecting rod mechanism comprises a crank and a connecting rod, the rocker arm assembly is rotatably installed on the support, and the hasp mechanism comprises a jump pin, a lock catch and a traction rod; the side, facing the traction rod, of the lock catch is provided with a lock catch abutting face, the traction rod is provided with a first limiting face and a second limiting face which are used for being matched with the lock catch abutting face in a limiting mode, and the lock catch abutting face abuts against the first limiting face of the traction rod when the circuit breaker is in a closed state. And when the circuit breaker is tripped, the first limiting surface is separated from the first limiting surface of the draw bar and then abuts against the second limiting surface. According to the circuit breaker provided by the utility model, during tripping, the draw bar is abutted against the lock catch abutting surface through the second limiting surface to position and limit the position of the lock catch, so that the circuit breaker is stabilized in a tripping state, and the re-tripping and re-closing operation of the circuit breaker cannot be influenced.

Description

Technical Field

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

[0002] Circuit breakers are mainly used to protect electrical equipment and lines from overcurrent faults (short circuit and overload protection), which can effectively prevent personal electric shock accidents and protect the safe operation of power equipment. After the existing circuit breaker is tripped, the parts of the latch mechanism in the operating mechanism rotate relative to each other and separate from each other, resulting in uncertainty in the relative position, which may affect the re-closing operation of the circuit breaker. Summary of the invention

[0003] The purpose of the utility model is to overcome at least one defect of the prior art and provide a circuit breaker.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The circuit breaker comprises a housing, a rotating shaft system and an operating mechanism installed in the housing, wherein the operating mechanism comprises a bracket, a rocker assembly, an energy storage spring, a buckle mechanism and a connecting rod mechanism, at least one moving contact is arranged on the rotating shaft system, the connecting rod mechanism comprises a crank and a connecting rod, the rocker assembly is rotatably installed on the bracket, the buckle mechanism comprises a trip buckle, a lock buckle and a traction rod, the trip buckle, the lock buckle and the traction rod are rotatably arranged on the bracket respectively, the lock buckle is connected with the trip buckle buckle, the traction rod is limitedly connected with the lock buckle, the crank is rotatably installed on the trip buckle through a crank shaft, one end of the connecting rod is connected with the crank The spring shaft is rotatably connected, and the other end is directly or indirectly connected to the rotating shaft system for driving the rotating shaft system to rotate. One end of the energy storage spring is connected to the rocker arm assembly, and the other end is connected to the spring shaft at the connection between the connecting rod and the crank. The lock is provided with a lock abutment surface on the side facing the traction rod, and the traction rod is provided with a first limiting surface and a second limiting surface for limiting cooperation with the lock abutment surface. The lock abutment surface abuts with the first limiting surface of the traction rod when the circuit breaker is in a closed state, and abuts with the second limiting surface after being separated from the first limiting surface of the traction rod when the circuit breaker is tripped.

[0006] Optionally, the first limiting surface and the second limiting surface are arranged in steps.

[0007] Optionally, the edge of the lock buckle abutting surface is provided with rounded corners for slidingly cooperating with the first limiting surface and the second limiting surface.

[0008] Optionally, a step structure is provided at one end of the traction rod, and the first limit surface and the second limit surface are provided on the side of the step structure facing the lock. A traction rod rotating shaft for rotatable installation is provided in the middle of the traction rod, and an actuated rod parallel to the traction rod rotating shaft is provided at the other end of the traction rod, and at least one actuated part is provided on the actuated rod for cooperating with the magnetic release drive.

[0009] Optionally, the driven rod is provided with a spring positioning groove on a side facing the lock buckle, which is used to limit the reaction force spring between the lock buckle and the traction rod.

[0010] Optionally, a reaction force spring is provided between the lock and the traction rod. The reaction force spring is sleeved on the lock shaft, one end of which is inserted into a spring positioning hole on the lock between the lock shaft and the lock abutment surface, and the other end is confined in a spring positioning groove on the side of the traction rod facing the lock.

[0011] Optionally, it also includes a magnetic release, which includes an oil cup, a coil, a yoke and a connecting plate. The yoke is provided with a positioning plate, and the positioning plate is provided with a fitting hole and a coil positioning hole. The positioning plate of the yoke is sleeved on the oil cup through the fitting hole, and the coil is sleeved on the oil cup. One end of the coil used to connect with the moving contact passes through the coil positioning hole of the yoke, and the other end of the coil used to connect with the terminal block is connected to the connecting plate, and the connecting plate is fixed in the shell.

[0012] Optionally, one end of the coil for connecting to the moving contact is located on one side of the oil cup, and the other end of the coil for connecting to the terminal block is located on the other side of the oil cup, and the side of the other end of the coil facing the one end of the coil is a first welding surface for welding to the connecting plate, and the other side is a second welding surface for connecting to the terminal block.

[0013] Optionally, a guide rail groove is provided on the outer side of the shell, a buckle is provided in the guide rail groove and is spaced from the bottom wall of the guide rail groove, and a retaining spring is provided on the side wall of the guide rail groove and is located between the bottom wall of the guide rail groove and the buckle; both side edges of the guide rail are inserted into the guide rail groove, and the upper limit of the side edge of the guide rail in the thickness direction is located between the buckle and the bottom wall of the guide rail groove, and the upper limit in the width direction is located between the retaining spring and the side wall of the guide rail groove opposite to the retaining spring.

[0014] Optionally, the retaining spring has a bent middle portion and two movable ends located at both ends, a retaining spring groove is provided on the side wall of the guide rail groove, the side wall of the retaining spring groove is adapted to the convex surface of the bent middle portion, and a positioning block corresponding to the recess in the bent middle portion is provided in the retaining spring groove.

[0015] Optionally, the bracket is provided with two fixing platforms on both sides outside, the shell is provided with a first supporting platform for supporting the fixing platforms, and the fixing platform is fixed to the first supporting platform by a second screw; and / or, the bracket is provided with two bracket limiting parts on both sides outside, the shell is provided with limiting grooves corresponding to the bracket limiting parts; and / or, the two sides of the bracket are respectively provided with supporting feet extending downward, and the shell is provided with slots corresponding to the supporting feet.

[0016] The circuit breaker of the utility model realizes positioning and limiting the position of the lock by abutting the second limiting surface against the lock abutting surface of the traction rod when tripping, so that the circuit breaker is stabilized in the tripping state, thereby not affecting the re-closing operation of the circuit breaker.

[0017] In addition, the limiting surface of the traction rod is designed in a stepped manner, which simplifies the structure and is easy to construct and form, and the locking buckle abutting surface can stably switch back and forth between the first limiting surface and the second limiting surface.

[0018] In addition, the rounded corners are used as process rounded corners, so that the lock buckle abutment surface can smoothly switch back and forth between the first limit surface and the second limit surface, avoiding the deadlock phenomenon caused by the lock buckle and the first limit surface and the second limit surface of the traction rod being stuck, thereby improving the reliability of the circuit breaker.

[0019] In addition, since there are no exposed live screws at the bottom of the circuit breaker, there is no need to assemble an insulating base plate, which reduces the number of components of the circuit breaker and improves the electrical performance of the circuit breaker, thereby achieving the purpose of electrical safety and personal safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model circuit breaker without the cover assembly;

[0021] Figure 2 It is a structural schematic diagram of the operating mechanism of the utility model in the closed state;

[0022] Figure 3 It is a structural schematic diagram of the operating mechanism of the utility model in the tripped state;

[0023] Figure 4 It is a structural schematic diagram of the traction rod of the utility model;

[0024] Figure 5 It is a structural schematic diagram of the lock buckle of the utility model;

[0025] Figure 6 It is a structural schematic diagram of the magnetic release of the utility model;

[0026] Figure 7 It is a structural schematic diagram of the base of the utility model;

[0027] Figure 8It is a structural schematic diagram of the mounting side plate on one side of the bracket of the utility model;

[0028] Fig. 9 This is a one-view assembly diagram of the circuit breaker and the guide rail of the utility model;

[0029] Fig.10 This is an assembly diagram of the circuit breaker and the guide rail of the utility model from another perspective;

[0030] Housing 1; guide rail 10; base 11; first support platform 111; first fixing hole 111a; limiting groove 112; second support platform 113; second fixing hole 113a; buckle 114; slope surface 114a; snap ring 115; bent middle part 115a; movable end 115b; snap ring groove 116; positioning block 117; slot 118; cover assembly 12; shaft system 2; operating mechanism 3; bracket 31; fixing platform 311; third fixing hole 312; bracket limiting part 313; supporting foot 314; rocker arm assembly 32; energy storage spring 33; jump buckle 34; jump buckle overlap surface 34a; lock buckle 35; lock buckle shaft 350; lock buckle abutment surface 351; fillet 351a ; Lock overlap surface 352; Spring positioning hole 353; Lock mounting portion 354; Lock shaft hole 355; Drawbar 36; Drawbar shaft 360; Step structure 361; First limiting surface 361a; Second limiting surface 361b; Connecting surface 361c; Drawbar shaft hole 362; Slit 362a; Actuated rod 363; Actuated portion 363a; Spring positioning groove 364; Reaction spring 37; Crank 38; Connecting rod 39; Magnetic release 4; Oil cup 41; Coil 42; First welding surface 42a; Second welding surface 42b; Yoke 43; Positioning plate 431; Coil positioning hole 431a; Connecting plate 44; Opening groove 44a; Terminal block 5; Arc extinguishing system 6; Transformer 7. DETAILED DESCRIPTION

[0031] The following is a further description of the specific implementation of the circuit breaker of the present utility model in conjunction with the embodiments given in the accompanying drawings. The circuit breaker of the present utility model is not limited to the description of the following embodiments.

[0032] like Figure 1As shown, the circuit breaker of this embodiment includes a housing 1, a shaft system 2 installed in the housing 1, an operating mechanism 3, a magnetic release 4, an arc extinguishing system 6, and two groups of terminal blocks 5 located on both sides of the housing 1 for circuit breaker wiring. The shaft system 2 is provided with at least one moving contact, and the operating mechanism 3 is used to drive the shaft system 2 to rotate, and the shaft system 2 drives the moving contact to contact or separate with the corresponding static contact, conducts and disconnects the main circuit, and realizes the closing and opening of the main circuit. The magnetic release 4 drives the operating mechanism 3 to trip when a fault occurs in the main circuit (short circuit fault, overload fault), and the operating mechanism 3 drives the shaft system 2 to disconnect the main circuit to realize the protection function. The arc extinguishing system 6 is used to extinguish the arc generated during the opening and closing of the moving and static contacts.

[0033] like Figure 2 and Figure 3 As shown, the operating mechanism 3 of this embodiment includes a bracket 31, a rocker assembly 32, an energy storage spring 33, a buckle mechanism and a connecting rod mechanism, wherein the connecting rod mechanism includes a crank 38 and a connecting rod 39, the rocker assembly 32 is rotatably mounted on the bracket 31, the buckle mechanism includes a jump buckle 34, a lock buckle 35 and a traction rod 36, the jump buckle 34, the lock buckle 35 and the traction rod 36 are respectively rotatably arranged on the bracket 31, the lock buckle 35 is buckled with the jump buckle 34, the traction rod 36 is limitedly connected with the lock buckle 35, the crank 38 is rotatably mounted on the jump buckle 34 through a crank shaft, one end of the connecting rod 39 is rotatably connected to the crank 38 through a spring shaft, and the other end is directly or indirectly connected to the rotating shaft system 2 for driving the rotating shaft system 2 to rotate, one end of the energy storage spring 33 is connected to the rocker assembly 32, and the other end is connected to the spring shaft at the connection between the connecting rod 39 and the crank 38. The lock catch 35 and the trip catch 34 connected by the buckle limit the rotation position of the crank 38 so that the crank 38 can rotate with the trip catch 34 as the rotation center. The rocker assembly 32 is driven to swing by the handle, and the rocker assembly 32 drives the crank 38 and the connecting rod 39 to rotate, and then the connecting rod 39 drives the rotating shaft system 2 to rotate, and the rotating shaft system 2 drives the moving contact to rotate to conduct and disconnect the main circuit, so as to achieve the closing and opening of the circuit breaker. When the circuit breaker is in the closed state, the magnetic release 4 drives the traction rod 36 to rotate when the main circuit fails, so that the traction rod 36 and the lock catch 35 are released from the limit fit, and then the lock catch 35 and the trip catch 34 are released from the buckle fit, so that the operating mechanism is tripped, and the trip catch 34 cannot limit the position of the crank 38, and the energy storage spring 33 releases energy to drive the rotating shaft system 2 to rotate through the connecting rod mechanism, and the rotating shaft system 2 drives the moving contact to rotate to disconnect the main circuit, so as to achieve the tripping protection, which is the prior art in this field.

[0034] An improvement of the circuit breaker of this embodiment is that Figure 2-Figure 5As shown, the lock buckle 35 is provided with a lock buckle abutting surface 351 on the side facing the traction rod 36, and the traction rod 36 is provided with a first limiting surface 361a and a second limiting surface 361b for limiting cooperation with the lock buckle abutting surface 351. The lock buckle abutting surface 351 abuts against the first limiting surface 361a of the traction rod 36 when the circuit breaker is in a closed state, and abuts against the second limiting surface 361b after being separated from the first limiting surface 361a of the traction rod 36 when the circuit breaker is tripped. Figure 2 As shown, when the circuit breaker is in the closed state, the lock abutment surface 351 abuts against the first limit surface 361a, so that the operating mechanism 3 is in a stable state; Figure 3 As shown, when the circuit breaker trips, the traction rod 36 rotates clockwise around the traction rod shaft 360, and the first limiting surface 361a flips upward to separate from the lock buckle abutting surface 351, so that the lock buckle 35 is released from the limiting cooperation with the traction rod 36 and rotates clockwise around the lock buckle shaft 350, so that the lock buckle abutting surface 351 moves toward the second limiting surface 361b until it abuts against the second limiting surface 361b, completing the circuit breaker tripping. In the circuit breaker of this embodiment, when the traction rod 36 abuts against the lock buckle abutting surface 351 through the second limiting surface 361b, the position of the positioning and limiting lock buckle 36 is realized, so that the circuit breaker is stabilized in the tripped state, thereby not affecting the re-closing operation of the circuit breaker.

[0035] Preferably, the first limiting surface 361a and the second limiting surface 361b are arranged in steps. The limiting surface of the traction rod 36 is designed in a stepped manner, which simplifies the structure and is easy to construct and form. The lock abutting surface 351 can stably switch back and forth between the first limiting surface 361a and the second limiting surface 361b.

[0036] Furthermore, the edge of the lock buckle abutting surface 351 is provided with a rounded corner 351a for slidingly cooperating with the first limiting surface 361a and the second limiting surface 361b. The rounded corner 351a is used as a process rounded corner 351a, so that the lock buckle abutting surface 351 can smoothly switch back and forth between the first limiting surface 361a and the second limiting surface 361b, thereby avoiding the deadlock phenomenon caused by the locking buckle 35 and the first limiting surface 361a and the second limiting surface 361b of the traction rod 36, thereby improving the reliability of the circuit breaker.

[0037] like Figure 1-Figure 4As shown, the specific structure of the traction rod 36 in this embodiment, one end of the traction rod 36 is provided with a step structure 361, and the step structure 361 is provided with a first limit surface 361a, a connecting surface 361c and a second limit surface 361b connected in a step-like manner on the side facing the lock buckle 35, and the middle part of the traction rod 36 is provided with a traction rod rotating shaft 360 for rotatable installation, and the other end of the traction rod 36 is provided with an actuated rod 363 parallel to the traction rod rotating shaft 360, and the actuated rod 363 is provided with at least one actuated portion 363a on the side away from the traction rod rotating shaft 360, which is used to drive and cooperate with the magnetic release 4. The actuated rod 363 is provided with a spring positioning groove 364 on the side facing the lock buckle 35, which is used to limit the reaction force spring 37. Further, the traction rod 36 and the traction rod rotating shaft 360 are separately provided, and a traction rod rotating shaft hole 362 rotatably matched with the traction rod rotating shaft 360 is provided in the middle of the traction rod 36, and the traction rod rotating shaft hole 362 is provided with an axial gap 362a on the side connected to the step structure 361, and the traction rod 36 is rotatably mounted on the traction rod rotating shaft 360 through the traction rod rotating shaft hole 362 thereon, and both ends of the traction rod rotating shaft 360 are fixed on the bracket 31. Of course, the traction rod 36 and the traction rod rotating shaft 360 can also be fixedly connected, for example, integrally connected, and the traction rod rotating shaft 360 is rotatably mounted on the bracket 31.

[0038] like Figure 2 , Figure 3 and Figure 5 As shown in the figure, the specific structure of the lock buckle 35 in this embodiment is that the lock buckle abutting surface 351 is provided at one end of the lock buckle 35, the middle part of the lock buckle 35 is provided with a spring positioning hole 353 for connecting the reaction spring 37 and a lock buckle lap surface 352 for snap connection with the jump buckle 34 at the side, and the other end of the lock buckle 35 is provided with a lock buckle rotating shaft 350 for rotational installation. When the circuit breaker is in the closed state, the jump buckle lap surface 34a overlaps the lock buckle lap surface 352 to realize the snap fit between the jump buckle 34 and the lock buckle 35; when the circuit breaker is tripped, the jump buckle lap surface 34a is separated from the lock buckle lap surface 352 to realize the release of the snap fit between the jump buckle 34 and the lock buckle 35. Furthermore, the lock buckle 35 and the lock buckle shaft 350 are separately provided, and the other end of the lock buckle 35 is provided with two lock buckle mounting parts 354 located on both sides, and the lock buckle mounting parts 354 are provided with lock buckle shaft holes 355 that are rotatably matched with the lock buckle shaft 350. The lock buckle 35 is rotatably mounted on the lock buckle shaft 350 through the lock buckle shaft holes 355 thereon, and the two ends of the lock buckle shaft 350 are fixed on the bracket 31. Of course, the lock buckle 35 and the lock buckle shaft 350 can also be fixedly connected, such as integrally connected, and the lock buckle shaft 350 can be rotatably mounted on the bracket 31.

[0039] like Figure 2 and Figure 3As shown, a reaction spring 37 is provided between the lock buckle 35 and the traction rod 36. The reaction spring 37 is sleeved on the lock buckle shaft 350, one end of which is inserted into a spring positioning hole 353 on the lock buckle 35 between the lock buckle shaft 350 and the lock buckle abutment surface 351, and the other end is limited in a spring positioning groove 364 on the side of the traction rod 36 facing the lock buckle 35. The spring positioning hole 353 and the spring positioning groove 364 cooperate to realize the positioning and limiting of the reaction spring 37 between the lock buckle 35 and the traction rod 36. Figure 3 The circuit breaker is in a tripped state. When the circuit breaker is closed again, the lock 35 rotates counterclockwise around the lock shaft 350 under the action of the tripping lock 34, and the lock abutment surface 351 ( Figure 5 ) is away from the second limiting surface 361b. At this time, the traction rod 36 rotates counterclockwise under the action of the reaction spring 37, and the first limiting surface 361a gradually and completely abuts against the lock abutting surface 351, completing the circuit breaker closing operation. Figure 2 The circuit breaker is shown in the closed position.

[0040] like Figure 6 As shown, the specific structure of the magnetic release 4 in this embodiment is a hydraulic electromagnetic release, the magnetic release 4 includes an oil cup 41, a coil 42, a yoke 43 and a connecting plate 44, the oil cup 41 is provided with a moving iron core and a spring, and the inside is sealed with hydraulic oil, the yoke 43 is provided with a positioning plate 431, the positioning plate 431 is provided with a set hole and a coil positioning hole 431a, the positioning plate 431 of the yoke 43 is sleeved on the oil cup 41 through the set hole, the coil 42 is sleeved on the oil cup 41, one end of the coil 42 for connecting to the moving contact passes through the coil positioning hole 431a of the yoke 43, the other end of the coil 42 for connecting to the terminal block 5 is connected to the connecting plate 44, and the connecting plate 44 is fixed in the housing 1. One end of the coil 42 for connecting with the moving contact is positioned in the coil positioning hole 431a of the yoke 43, and the other end of the coil 42 for connecting with the terminal block 5 is positioned in the housing through the connecting plate 44. The positioning structure of the coil 42 is simple and reliable. It should be noted that the working principle of the magnetic release 4 and the driving structure and action principle between the magnetic release 4 and the traction rod 36 are prior art and will not be described in detail here.

[0041] Specifically, Figure 6-Figure 7As shown, the yoke 43 is an L-shaped structure, one end of which is a positioning plate 431, the other end of the yoke 43 and the end of the coil 42 for connecting with the moving contact are located on one side of the oil cup 41, the other end of the coil 42 for connecting with the terminal block 5 is located on the other side of the oil cup 41, and the other end of the coil 42 facing the one end of the coil 42 is a first welding surface 42a for welding with the connecting plate 44, and the other side is a second welding surface 42b for connecting with the terminal block 5, the coil 42 and the terminal block 5 are connected by a conductive connector passing through the mutual inductor 7, and the conductive connector 42a is connected to the terminal block 5 by the conductive connector 42a. The connecting piece can be a soft connection structure or a connecting plate structure; the connecting plate 44 is an L-shaped structure, one end of which is welded to the first welding surface 42a of the coil 42, and the other end is fixed to the second supporting platform 113 of the housing 1. The housing 1 is provided with a second supporting platform 113 for supporting the connecting plate 44, and the other end of the connecting plate 44 is fixed to the second supporting platform 113 by a first screw. The other end of the connecting plate 44 is provided with an open groove 44a that matches the first screw, and the second supporting platform 113 is provided with a second fixing hole 113a that matches the first screw. The parts layout of the magnetic release 4 is compact and orderly, and the parts assembly and processing technology are simpler and more reliable.

[0042] like Figure 7 and Figure 8 As shown, in this embodiment, the bracket 31 of the operating mechanism 3 is installed in the housing 1, and the bracket 31 includes two symmetrical installation side plates arranged at intervals. The bracket 31 is provided with two fixing platforms 311 on both sides, and the housing 1 is provided with a first supporting platform 111 for supporting the fixing platform 311. The fixing platform 311 is fixed to the first supporting platform 111 by a second screw, and the first supporting platform 111 is provided with a first fixing hole 111a matched with the second screw, and the fixing platform 311 is provided with a third fixing hole 312 matched with the second screw; and / or, the bracket 31 is provided with two bracket limiting parts 313 on both sides, and the housing 1 is provided with a limiting groove 112 corresponding to the bracket limiting part 313; and / or, the two sides of the bracket 31 are respectively provided with supporting feet 314 extending downward, and the housing 1 is provided with a slot 118 corresponding to the supporting feet 314, and further, the supporting feet 314 are provided with a protrusion so that the supporting feet 314 and the slot 118 are interference fit. The mounting structure of the bracket 31 is simple, easy to install, and the installation is stable and firm.

[0043] like Figure 9-10As shown, the guide rail installation structure of the housing 1 in this embodiment, the housing 1 includes a base 11 and a cover assembly 12, and the cover assembly 12 is covered on the base 11. A guide rail groove is provided on the outer side of the housing 1, that is, on the bottom surface of the base 11, and a buckle 114 is provided in the guide rail groove, which is spaced from the bottom wall of the guide rail groove, and a retaining spring 115 is provided on the side wall of the guide rail groove between the bottom wall of the guide rail groove and the buckle 114; the two sides of the guide rail 10 are installed in the guide rail groove, and the upper limit of the side of the guide rail 10 in the thickness direction is located between the buckle 114 and the bottom wall of the guide rail groove, and the upper limit in the width direction is located between the retaining spring 115 and the side wall of the guide rail groove opposite to the retaining spring 115. The guide rail installation of the housing 1 adopts an elastic clamping method, which has a simple structure, is easy to disassemble and assemble, and is firmly installed. Of course, the retaining spring 115 of this embodiment can also be other elastic structures such as an elastic arm integrally arranged on the housing 1.

[0044] Specifically, a group of buckles 114 corresponding to one side of the guide rail 10 are respectively provided on the two side walls of the guide rail groove, and each group of buckles 114 includes at least one buckle 114 in a row, and the buckle 114 is a block structure, and a slope surface 114a is provided on the side away from the bottom wall of the guide rail groove. The clamping spring 115 is similar to an Ω-shaped structure, having a bent middle portion 115a and two movable ends 115b at both ends, and a clamping spring groove 116 is provided on the side wall of the guide rail groove, and the side wall of the clamping spring groove 116 is adapted to the convex surface of the bent middle portion 115a, and a positioning block 117 corresponding to the notch of the bent middle portion 115a is provided in the clamping spring groove 116.

[0045] When the circuit breaker is installed on the guide rail 10, the bent middle part 115a of the retaining spring 115 is placed in the retaining spring groove 116 of the housing 1 and sleeved on the positioning block 117; then one side of the guide rail 10 is installed in the guide rail groove, and the retaining spring 115 is inserted between the buckle 114 on the side wall of the guide rail groove where the retaining spring 115 is located and the bottom wall of the guide rail groove and abuts against the movable end 115b of the retaining spring 115; then the circuit breaker is pressed to compress the retaining spring 115 in the direction away from the one side of the guide rail 10, and the other side of the guide rail 10 slides into the guide rail groove through the slope surface 114a of the buckle 114 on the corresponding side, and is inserted between the buckle 114 on the corresponding side and the bottom wall of the guide rail groove; finally, the circuit breaker is stopped from being pressed, and the circuit breaker is firmly fixed to the guide rail 10 under the reaction force of the retaining spring 115. When the circuit breaker and the guide rail 10 are disassembled, the circuit breaker is pressed, and one side of the guide rail 10 squeezes the retaining spring 115, so that the other side of the guide rail 10 slides out of the guide rail groove. At this time, the circuit breaker can be directly removed to complete the disassembly.

[0046] It is worth mentioning that the fixing holes on the housing 1 of the circuit breaker are all arranged on the side of the base 11 facing the cover assembly 12, and the fixing holes include a first fixing hole 111a for fixing the operating mechanism 3, a second fixing hole 113a for fixing the magnetic release 4, and a fixing hole for fixing the terminal block 5, so that there are no exposed live screws at the bottom of the circuit breaker and no need to assemble an insulating base plate, which reduces the components of the circuit breaker and improves the electrical performance of the circuit breaker, thereby achieving the purpose of electrical safety and personal safety.

[0047] 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 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 a limitation on 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.

[0048] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be 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 (1), a rotating shaft system (2) installed in the housing (1), and an operating mechanism (3), wherein the operating mechanism (3) comprises a bracket (31), a rocker assembly (32), an energy storage spring (33), a buckle mechanism and a connecting rod mechanism, the rotating shaft system (2) is provided with at least one moving contact, the connecting rod mechanism comprises a crank (38) and a connecting rod (39), the rocker assembly (32) is rotatably installed on the bracket (31), the buckle mechanism comprises a trip buckle (34), a lock buckle (35) and a traction rod (36), the trip buckle (34), the lock buckle (35) and the traction rod (36) The guide rods (36) are rotatably arranged on the brackets (31), the lock buckle (35) is snap-connected with the jump buckle (34), the traction rod (36) is limit-connected with the lock buckle (35), the crank (38) is rotatably mounted on the jump buckle (34) via a crank shaft, one end of the connecting rod (39) is rotatably connected with the crank (38) via a spring shaft, and the other end is directly or indirectly connected with the rotating shaft system (2) for driving the rotating shaft system (2) to rotate, one end of the energy storage spring (33) is connected with the rocker arm assembly (32), and the other end is connected with the spring shaft at the connection between the connecting rod (39) and the crank (38); the characteristics are: The lock buckle (35) is provided with a lock buckle abutting surface (351) on a side facing the traction rod (36); the traction rod (36) is provided with a first limiting surface (361a) and a second limiting surface (361b) for limiting cooperation with the lock buckle abutting surface (351); the lock buckle abutting surface (351) abuts against the first limiting surface (361a) of the traction rod (36) when the circuit breaker is in a closed state; and abuts against the second limiting surface (361b) after being separated from the first limiting surface (361a) of the traction rod (36) when the circuit breaker is tripped.

2. The circuit breaker according to claim 1, characterized in that: The first limiting surface (361a) and the second limiting surface (361b) are arranged in steps.

3. The circuit breaker according to claim 1, characterized in that: The edge of the lock buckle abutting surface (351) is provided with a rounded corner (351a) for slidingly cooperating with the first limiting surface (361a) and the second limiting surface (361b).

4. The circuit breaker according to claim 1, characterized in that: A step structure (361) is provided at one end of the traction rod (36); the step structure (361) is provided with the first limit surface (361a) and the second limit surface (361b) on the side facing the lock buckle (35); a traction rod rotating shaft (360) for rotatable installation is provided in the middle of the traction rod (36); a driven rod (363) parallel to the traction rod rotating shaft (360) is provided at the other end of the traction rod (36); and at least one driven portion (363a) is provided on the driven rod (363) for driving and cooperating with the magnetic release (4).

5. The circuit breaker according to claim 4, characterized in that: The driven rod (363) is provided with a spring positioning groove (364) on a side facing the lock buckle (35) for limiting the reaction force spring (37) between the lock buckle (35) and the traction rod (36).

6. The circuit breaker according to claim 1, characterized in that: A reaction spring (37) is provided between the lock buckle (35) and the traction rod (36); the reaction spring (37) is sleeved on the lock buckle rotating shaft (350); one end of the reaction spring (37) is inserted into a spring positioning hole (353) on the lock buckle (35) between the lock buckle rotating shaft (350) and the lock buckle abutting surface (351); and the other end is confined in a spring positioning groove (364) on a side of the traction rod (36) facing the lock buckle (35).

7. The circuit breaker according to claim 1, characterized in that: The invention also comprises a magnetic release (4), the magnetic release (4) comprising an oil cup (41), a coil (42), a yoke (43) and a connecting plate (44), the yoke (43) being provided with a positioning plate (431), the positioning plate (431) being provided with a sleeve hole and a coil positioning hole (431a), the positioning plate (431) of the yoke (43) being sleeved on the oil cup (41) through the sleeve hole, the coil (42) being sleeved on the oil cup (41), one end of the coil (42) being used for connecting with the moving contact passing through the coil positioning hole (431a) of the yoke (43), the other end of the coil (42) being used for connecting with the terminal block (5) being connected with the connecting plate (44), and the connecting plate (44) being fixed in the housing (1).

8. The circuit breaker according to claim 7, characterized in that: One end of the coil (42) used for connecting to the moving contact is located on one side of the oil cup (41), and the other end of the coil (42) used for connecting to the terminal block (5) is located on the other side of the oil cup (41), and the side of the other end of the coil (42) facing the one end of the coil (42) is a first welding surface (42a) used for welding to the connecting plate (44), and the other side is a second welding surface (42b) used for connecting to the terminal block (5).

9. The circuit breaker according to claim 1, characterized in that: A guide rail groove is provided on the outer side of the housing (1), a buckle (114) spaced from the bottom wall of the guide rail groove is provided in the guide rail groove, and a retaining spring (115) is provided on the side wall of the guide rail groove and is located between the bottom wall of the guide rail groove and the buckle (114); both side edges of the guide rail (10) are inserted into the guide rail groove, and the upper limit of the side edge of the guide rail (10) in the thickness direction is located between the buckle (114) and the bottom wall of the guide rail groove, and the upper limit in the width direction is located between the retaining spring (115) and the side wall of the guide rail groove opposite to the retaining spring (115).

10. The circuit breaker according to claim 9, characterized in that: The retaining spring (115) comprises a bent middle portion (115a) and two movable ends (115b) at both ends; a retaining spring groove (116) is provided on the side wall of the guide rail groove; the side wall of the retaining spring groove (116) is adapted to the convex surface of the bent middle portion (115a); and a positioning block (117) corresponding to the notch of the bent middle portion (115a) is provided in the retaining spring groove (116).

11. The circuit breaker according to claim 1, characterized in that: The bracket (31) is provided with two fixing platforms (311) located on both sides, the shell (1) is provided with a first supporting platform (111) for supporting the fixing platform (311), and the fixing platform (311) is fixed on the first supporting platform (111) by a second screw; and / or, the bracket (31) is provided with two bracket limiting parts (313) located on both sides, the shell (1) is provided with limiting grooves (112) corresponding to the bracket limiting parts (313); and / or, the two sides of the bracket (31) are respectively provided with supporting feet (314) extending downwards, and the shell (1) is provided with slots (118) corresponding to the supporting feet (314).

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