Circuit breaker

Abstract

The circuit breaker comprises a shell, an operating mechanism and a bimetallic strip, the operating mechanism comprises a draw bar shaft, a jump pin, a lock catch, a draw bar and a draw bar spring, the draw bar spring is used for driving the lock catch to rotate in the hasp fit direction with the jump pin, the draw bar comprises a rotating part, a triggering part and a re-buckling part, and the triggering part and the re-buckling part are integrally formed with the rotating part. The draw bar shaft is sleeved with the draw bar through the rotating hole, the draw bar can rotate around the draw bar shaft and slide in the axial direction of the draw bar shaft, and the draw bar directly locks the lock catch through the re-buckling part; and the thermal adjusting knob is used for adjusting the distance between the touch piece and the triggering part of the traction rod by adjusting the displacement of the traction rod in the axial direction of the traction rod shaft. According to the circuit breaker, the draw bar for directly locking the lock catch is unlocked by the bimetallic strip, the draw bar shaft serves as a rotating shaft and a sliding guide shaft of the draw bar, the thermal adjusting knob directly adjusts the position of the draw bar to realize a thermal adjustable function, and the draw bar integrates the thermal adjustable function and the re-buckling and tripping functions.

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 often used to control the on and off of circuits, and automatically disconnect the circuits through protection mechanisms when a fault occurs in the circuits, thereby achieving a protective function. When the circuit breaker is closed, the operating mechanism can remain locked in the energy storage state. When an overload fault occurs in the circuit controlled by the circuit breaker, the bimetallic strip is bent by heat, and the bending amount of the bimetallic strip is greater than the gap between the bimetallic strip and the traction rod. The traction rod is pushed by the bimetallic strip, and the traction rod rotates to drive the operating mechanism to trip. After the operating mechanism is unlocked, it begins to release energy and drives the circuit breaker to open, thereby automatically disconnecting the circuit. After the operating mechanism trips, it needs to be re-locked before it can return to the energy storage state. Moreover, in different application scenarios of circuit breakers, there will be a demand for thermally adjustable functions. The gap between the bimetallic strip and the traction rod can be adjusted by adding a thermal adjustment device.

[0003] However, the parts used for thermal adjustment, re-release and tripping of existing circuit breakers are multiple separate parts, which have problems such as a large number of parts, high requirements for the degree of coordination between parts, and unstable implementation of thermal adjustment, re-release and tripping functions. Utility Model Content

[0004] The purpose of the present utility model is to overcome at least one defect of the prior art and provide a circuit breaker.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The circuit breaker comprises a housing, an operating mechanism and a bimetallic strip installed in the housing, one end of the bimetallic strip is fixed, and the other end is provided with a trigger, the operating mechanism comprises a drawbar shaft, a trip latch, a lock latch and a drawbar, and a drawbar spring arranged between the drawbar and the lock latch, the drawbar shaft is arranged on the operating mechanism bracket, the trip latch and the lock latch are respectively rotatably arranged on the operating mechanism bracket, and the lock latch cooperates with the trip latch latch, the drawbar spring is used to drive the lock latch to rotate in a direction of cooperating with the trip latch latch, the drawbar comprises a rotating part, and a trigger part and a re-lock part integrally formed with the rotating part, the rotating part is provided with a rotating hole cooperating with the drawbar shaft, the drawbar is sleeved on the drawbar shaft through the rotating hole, and can rotate around the drawbar shaft and slide along the axial direction of the drawbar shaft, the drawbar directly locks the lock latch through the re-lock part, and after the bimetallic strip is bent by heat, the trigger touches the trigger part of the drawbar so that the drawbar rotates to release the locking of the lock latch by the re-lock part, so that the lock latch and the trip latch are released from the latching cooperation;

[0007] It also includes a rotatable heat adjustment knob, which adjusts the distance between the triggering piece and the triggering portion of the traction rod by adjusting the displacement of the traction rod in the axial direction of the traction rod shaft.

[0008] Optionally, a sliding protrusion is provided in the rotating hole of the traction rod, and a sliding groove corresponding to the sliding protrusion is provided on the outer wall of the traction rod shaft. The sliding groove has two opposite stop side walls, and the sliding protrusion is slidably arranged in the sliding groove and is located between the two stop side walls.

[0009] Optionally, the axial front end of the traction rod shaft is provided with a frustum for avoiding the sliding protrusion.

[0010] Optionally, a positioning cone is provided at the axial end of the traction rod shaft, and a positioning step is provided in the rotating hole to block and cooperate with the positioning cone in the axial direction of the traction rod shaft.

[0011] Optionally, a first thermal adjustment plane, a transition slope and a second thermal adjustment plane connected in sequence are provided on the side of the trigger portion facing the trigger piece. When the thermal adjustment knob adjusts the circuit breaker to a high delay position, the trigger piece is opposite to the first thermal adjustment plane, and when the circuit breaker is at a low delay position, the trigger piece is opposite to the second thermal adjustment plane.

[0012] Optionally, an adjustment slot is provided on one side of the rotating portion, and an eccentric shaft is provided at one end of the heat adjustment knob and inserted into the adjustment slot.

[0013] Optionally, the thermal adjustment knob is rotatably arranged on the shell, the thermal adjustment knob is provided with a first limit block, the shell is provided with a first mounting hole that cooperates with the thermal adjustment knob for rotation, a first avoidance hole located on the side wall of the first mounting hole and used to avoid the first limit block, and a first stop block and a second stop block for limiting the movement range of the first limit block.

[0014] Optionally, a positioning spring is provided between the heat adjustment knob and the shell, and an annular groove is provided on the outer wall of the heat adjustment knob. The arcuate end of the positioning spring is clamped into the annular groove, and the straight end of the positioning spring is clamped into the straight groove on the shell.

[0015] Optionally, it also includes an electromagnetic system, an adjusting rod and a magnetic adjusting knob that are respectively rotatable, and a reset spring that provides an elastic reset force for the adjusting rod. The electromagnetic system includes a yoke, a rotatable armature, and an armature spring that provides an elastic reset force for the armature, and the armature and the yoke are arranged relative to each other; when a short circuit occurs in the circuit breaker, the armature overcomes the elastic force of the armature spring and is attracted to the yoke, and at the same time the armature drives the traction rod to rotate to release the lock of the re-locking part on the lock, so that the lock and the jump lock are released from the buckle cooperation; the magnetic adjusting knob is driven to cooperate with the adjusting rod, and the adjusting rod is driven to cooperate with the armature, and the magnetic adjusting knob drives the armature to rotate through the adjusting rod to adjust the angle of the armature, thereby adjusting the distance between the armature and the yoke.

[0016] Optionally, the rotation axis of the adjusting rod is arranged parallel to the rotation axis of the armature, and the armature includes a driven part and a suction part for engaging with the suction surface of the magnetic yoke, and the driven part and the suction part are located on both sides of the rotation axis of the armature, and a pushing arm is extended from one side of the adjusting rod to cooperate with the driven part, and the driven part and the pushing arm are located on the same side of the line between the rotation axis of the adjusting rod and the rotation axis of the armature.

[0017] Optionally, the rotation axis of the adjusting rod is arranged perpendicular to the rotation axis of the magnetic adjusting knob, the lower end of the magnetic adjusting knob is provided with a first magnetic adjusting plane, a spiral surface and a second magnetic adjusting plane connected in sequence, and an adjusting arm is extended on one side of the adjusting rod; when the magnetic adjusting knob adjusts the circuit breaker to a momentary high gear, the first magnetic adjusting plane is against the adjusting arm, and when the circuit breaker is in a momentary low gear, the second magnetic adjusting plane is against the adjusting arm.

[0018] Optionally, the magnetic adjustment knob is rotatably arranged on the shell, and the magnetic adjustment knob is provided with a second limit block. The shell is provided with a second mounting hole that rotatably cooperates with the magnetic adjustment knob, a second avoidance hole located on the side wall of the second mounting hole and used to avoid the second limit block, and a third stop block and a fourth stop block for limiting the movement stroke of the second limit block.

[0019] Optionally, a fixing frame is further included, and the upper end of the base of the shell is provided with a rotating groove that rotates with the adjusting rod, and the fixing frame includes a pressure plate and a fixing column on one side of the pressure plate, and the adjusting rod is rotatably installed in the rotating groove, and the pressure plate covers the rotating groove and is located above the adjusting rod, and the fixing column is fixed to the upper end of the base by a fixing screw, and the fixing column is provided with a fixing screw hole that cooperates with the fixing screw.

[0020] In the circuit breaker of the utility model, the traction rod of the direct locking catch is driven by the bimetallic sheet to unlock it, and the traction rod shaft serves as the rotating shaft and sliding guide shaft of the traction rod. The thermal adjustment knob directly adjusts the position of the traction rod to realize the thermal adjustment function. The traction rod integrates the thermal adjustment function, the re-locking function and the tripping function in one, simplifies the structure, reduces the intermediate transition parts, reduces the number of transmission stages, and improves the reliability and stability.

[0021] In addition, the sliding fit structure between the traction rod and the traction rod shaft is simple, and the traction rod can slide stably.

[0022] In addition, the magnetic adjustment knob drives the armature to rotate through the adjustment rod to adjust the angle of the armature, thereby adjusting the distance between the armature and the magnetic yoke, adjusting the size of the magnetic air gap, and realizing the magnetic adjustable function.

[0023] In addition, the adjusting rod drives the armature to rotate in the same direction, so that the adjusting rod, armature and yoke are arranged compactly, and the transmission is stable and reliable, thereby improving the reliability of the magnetic adjustable function. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of the circuit breaker of the utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the hidden upper cover of the circuit breaker of the utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the circuit breaker with hidden upper cover and middle cover of the utility model;

[0027] Figure 4 It is a structural diagram of the operating mechanism of the utility model;

[0028] Figure 5 It is a cross-sectional view of the drawbar and drawbar shaft of the utility model;

[0029] Figure 6 This is a schematic structural diagram of the traction rod shaft of the utility model;

[0030] Figure 7 This is a structural diagram of the traction rod of the utility model from one perspective;

[0031] Figure 8 This is a structural diagram of the traction rod of the utility model from another perspective;

[0032] Figure 9 This is a schematic diagram of the structure of the heat adjustment knob of the utility model;

[0033] Figure 10 This is a schematic structural diagram of the middle cover of the utility model;

[0034] Figure 11 This is a schematic structural diagram of the traction rod spring of the utility model;

[0035] Figure 12 It is a structural diagram of the electromagnetic system and bimetallic strip of the utility model;

[0036] Figure 13 It is a structural diagram of the adjusting rod of the utility model;

[0037] Figure 14 This is a structural diagram of the magnetic adjustment knob of the utility model;

[0038] Figure 15 It is a structural diagram of the fixing frame of the utility model;

[0039] Figure 16 This is a structural diagram of the heat adjustment knob, positioning clip and middle cover of the utility model;

[0040] Figure 17 It is a structural schematic diagram of the adjusting rod, the return spring and the magnetic adjusting knob of the utility model.

[0041] Housing 1; base 11; middle cover 12; first mounting hole 121; first avoidance hole 122; first stop block 123; second stop block 124; straight card slot 125; second mounting hole 126; second avoidance hole 127; third stop block 128; fourth stop block 129; upper cover 13; operating mechanism 2; lock 21; traction rod 22; rotating portion 221; rotating hole 2211; sliding protrusion 2212; positioning step 2213; triggering portion 222; first thermal adjustment plane 2221; transition slope 2222; second thermal adjustment plane 2223; re-locking portion 223; adjustment slot 224; limiting plate 225; hook slot 226; traction rod shaft 23; sliding groove 231; stop side wall 232; frustum 233; positioning Cone 234; traction rod spring 24; spring body 241; connecting rib 242; notch 243; operating mechanism bracket 25; bimetallic strip 3; touch piece 30; thermal adjustment knob 4; positioning retaining spring 40; eccentric shaft 41; first limit block 42; annular groove 43; electromagnetic system 5; yoke 51; suction surface 511; armature 52; driven part 521; suction part 522; armature spring 53; electromagnetic system bracket 54; adjusting rod 6; return spring 60; adjusting arm 61; pushing arm 62; magnetic adjustment knob 7; first magnetic adjustment plane 71; spiral surface 72; second magnetic adjustment plane 73; second limit block 74; fixing frame 8; pressure plate 81; fixing column 82; vertical plate 83; limit column 84; fixing screw hole 85; terminal block 9. DETAILED DESCRIPTION

[0042] The following embodiments are given in conjunction with the accompanying drawings to further illustrate the specific implementation of the circuit breaker of the present invention. The circuit breaker of the present invention is not limited to the description of the following embodiments.

[0043] like Figure 1-Figure 3 As shown, the circuit breaker of this embodiment includes a housing 1, an operating mechanism 2 mounted within the housing 1, a rotating shaft system, and a protective mechanism. The housing 1 comprises a base 11, a middle cover 12, and an upper cover 13, stacked and fixed in sequence. The rotating shaft system is provided with at least one moving contact. The operating mechanism 2 is used to drive the rotating shaft system to rotate, which drives the moving contact to contact or separate with the corresponding static contact, connecting and disconnecting the main circuit, thereby closing and opening the circuit breaker. The protective mechanism drives the operating mechanism 2 to trip when a main circuit fault (short circuit, overload, or leakage fault) occurs. The operating mechanism 2 drives the rotating shaft system to disconnect the main circuit to achieve the protective function. The protective mechanism includes a bimetallic strip 3 for overload protection and an electromagnetic system 5 for short-circuit protection. One end of the bimetallic strip 3 is fixed, and the other end is provided with a trigger 30.

[0044] like Figure 4 As shown, the operating mechanism 2 includes an operating mechanism bracket 25, a rocker assembly, an energy storage spring, a buckle mechanism and a connecting rod mechanism, wherein the connecting rod mechanism includes a crank and a connecting rod, the operating mechanism bracket 25 is fixed in the base 11 of the housing 1, the rocker assembly is rotatably mounted on the operating mechanism bracket 25, the buckle mechanism includes a jump buckle, a lock buckle 21, a traction rod 22, a traction rod shaft 23 and a traction rod spring 24 arranged between the traction rod 22 and the lock buckle 21, the traction rod shaft 23 is arranged on the operating mechanism bracket 25, and the operating mechanism bracket 25 is provided with a spring for fixing the traction rod shaft 23. The fixing hole, the trip latch, lock catch 21 and traction rod 22 are respectively rotatably mounted on the operating mechanism bracket 25, the lock catch 21 is connected to the trip latch with a hasp, the traction rod spring 24 is used to drive the lock catch 21 to rotate in the direction of matching with the trip latch with a hasp, the traction rod 22 is limitedly connected to the lock catch 21, the crank is rotatably mounted on the trip latch via a crank shaft, one end of the connecting rod is rotatably connected to the crank via a spring shaft, and the other end is directly or indirectly connected to the shaft system for driving the shaft system to rotate, one end of the energy storage spring is connected to the rocker assembly, and the other end is connected to the spring shaft at the connection between the connecting rod and the crank. The hasp-connected lock catch 21 and the trip latch limit the rotation position of the crank so that the crank can rotate with the trip latch as the rotation center. The rocker assembly is driven to swing by the handle, and the rocker assembly drives the crank and connecting rod to rotate, and then the connecting rod drives the shaft system to rotate, and the shaft system drives the moving contact to rotate to conduct and disconnect the main circuit, thereby achieving the closing and opening of the circuit breaker. When the circuit breaker is in the closed state, the magnetic release drives the traction rod 22 to rotate when a fault occurs in the main circuit, so that the traction rod 22 releases the lock on the lock 21, and then the lock 21 and the tripping latch release the coupling, so that the operating mechanism 2 is tripped. The tripping latch cannot limit the position of the crank, and the energy storage spring releases energy through the connecting rod mechanism to drive the rotating shaft system to rotate. The rotating shaft system drives the moving contact to rotate to disconnect the main circuit, thereby realizing tripping protection. This is the existing technology in this field.

[0045] The improvement of this application is that Figure 2 and Figure 3 As shown, the traction rod 22 includes a rotating portion 221, and a trigger portion 222 and a re-engagement portion 223 integrally formed with the rotating portion 221. The rotating portion 221 is provided with a rotating hole 2211 that cooperates with the traction rod shaft 23. The traction rod 22 is sleeved on the traction rod shaft 23 through the rotating hole 2211, and can rotate around the traction rod shaft 23 and slide along the axial direction of the traction rod shaft 23. The traction rod 22 directly locks the lock buckle 21 through the re-engagement portion 223. When an overload fault occurs in the circuit breaker, the bimetallic strip 3 is bent by heat, and the trigger 30 touches the trigger portion 222 of the traction rod 22, causing the traction rod 22 to rotate to release the lock of the re-engagement portion 223 on the lock buckle 21, so that the lock buckle 21 and the trip buckle are released from the buckle fit.

[0046] The circuit breaker of this embodiment also includes a thermal adjustment knob 4 rotatably mounted on the middle cover 12 of the housing 1. This knob 4 adjusts the distance between the trigger 30 and the trigger portion 222 of the draw rod 22 by adjusting the axial displacement of the draw rod 22 about the draw rod shaft 23. In this embodiment, the draw rod 22, which directly locks the latch 21, is actuated by the bimetallic strip 3 to unlock it. The draw rod shaft 23 serves as both the rotating axis and the sliding guide axis for the draw rod 22. The thermal adjustment knob 4 directly adjusts the position of the draw rod 22 to achieve thermal adjustment. The draw rod 22 integrates thermal adjustment, re-engagement, and tripping functions, simplifying its structure, reducing intermediate transition parts, and reducing the number of transmission stages, thereby improving reliability and stability.

[0047] like Figure 5 and Figure 6 As shown, the mating structure between the drawbar 22 and the drawbar shaft 23 of this embodiment comprises a sliding protrusion 2212 disposed within the rotation hole 2211 of the drawbar 22, and a sliding groove 231 corresponding to the sliding protrusion 2212 is disposed on the outer wall of the drawbar shaft 23. The sliding groove 231 has two opposing stopper sidewalls 232 for limiting the sliding travel of the drawbar 22. The sliding protrusion 2212 slides within the sliding groove 231 and is located between the two stopper sidewalls 232. The sliding protrusion 2212 is preferably an annular protrusion disposed on the inner wall of the rotation hole 2211, and the sliding groove 231 is preferably an annular groove. The sliding mating structure between the drawbar 22 and the drawbar shaft 23 is simple, ensuring stable sliding of the drawbar 22.

[0048] Preferably, the axial front end of the drawbar shaft 23 is provided with a truncated cone 233 for avoiding the sliding protrusion 2212, thereby reducing installation difficulty and facilitating installation. The axial end of the drawbar shaft 23 is provided with a positioning cone 234. The rotating hole 2211 is provided with a positioning step 2213 that blocks and cooperates with the positioning cone 234 in the axial direction of the drawbar shaft 23, thereby locating the drawbar shaft 23. During installation, the truncated cone 233 at the axial front end of the drawbar shaft 23 first passes into the rotating hole 2211, passes over the sliding protrusion 2212, and then the positioning cone 234 at the axial end of the drawbar shaft 23 is blocked by the positioning step 2213. At this point, the drawbar shaft 23 is installed in place, and the sliding protrusion 2212 is located in the sliding groove 231 and abuts against the stop side wall 232 adjacent to the truncated cone 233.

[0049] like Figure 3 and Figure 7 As shown, the matching structure between the traction rod 22 and the trigger member 30 of this embodiment, the trigger portion 222 of the traction rod 22 is provided with a first thermal adjustment plane 2221, a transition slope 2222 and a second thermal adjustment plane 2223 connected in sequence on the side facing the trigger member 30, and the thermal adjustment knob 4 adjusts the circuit breaker to a high delay position so that the trigger member 30 is opposite to the first thermal adjustment plane 2221, that is, adjusts the distance between the trigger member 30 and the traction rod 22 to the maximum value; the thermal adjustment knob 4 adjusts the circuit breaker to a low delay position so that the trigger member 30 is opposite to the second thermal adjustment plane 2223, that is, adjusts the distance between the trigger member 30 and the traction rod 22 to the minimum value.

[0050] like Figure 3 、 Figure 7 and Figure 9 As shown, the matching structure between the traction rod 22 and the heat adjustment knob 4 of this embodiment is that an adjustment slot 224 is provided on one side of the rotating portion 221 of the traction rod 22, and two spaced limit plates 225 are extended from one side of the rotating portion 221. The adjustment slot 224 is formed between the two limit plates 225, and the limit plates 225 are preferably L-shaped structures; one end of the heat adjustment knob 4 is provided with an eccentric shaft 41 inserted into the adjustment slot 224. Figure 3 As shown, when the heat adjustment knob 4 is rotated clockwise, the heat adjustment knob 4 is driven to slide to the left by the eccentric shaft 41; when the heat adjustment knob 4 is rotated counterclockwise, the heat adjustment knob 4 is driven to slide to the right by the eccentric shaft 41.

[0051] like Figure 2 、 Figure 9 、 Figure 10 and Figure 16As shown in FIG. 1 , the rotation structure of the heat adjustment knob 4 of this embodiment is provided with a first limit block 42. The middle cover 12 of the housing 1 is provided with a first mounting hole 121 for rotationally cooperating with the heat adjustment knob 4, a first avoidance hole 122 located on the side wall of the first mounting hole 121 and used to avoid the first limit block 42, and a first stop block 123 and a second stop block 124 for limiting the movement range of the first limit block 42. Figure 2 and Figure 10 As shown, when the thermal adjustment knob 4 is rotated clockwise until the first limit block 42 is blocked by the first stop block 123, the circuit breaker is in the delayed high position, that is, the trigger 30 is opposite to the first thermal adjustment plane 2221; when the thermal adjustment knob 4 is rotated counterclockwise until the first limit block 42 is blocked by the second stop block 124, the circuit breaker is in the delayed low position, that is, the trigger 30 is opposite to the second thermal adjustment plane 2223.

[0052] Preferably, a positioning spring 40 is provided between the heat adjustment knob 4 and the middle cover 12 of the housing 1. An annular groove 43 is provided on the outer wall of the heat adjustment knob 4. The positioning spring 40 is a hook structure. The arcuate end of the positioning spring 40 is snapped into the annular groove 43, and the straight end of the positioning spring 40 is snapped into the straight snap groove 125 on the middle cover 12 of the housing 1. The positioning spring 40 serves to position and limit the rotational installation of the heat adjustment knob 4, allowing the positioning spring 40 to be assembled quickly and accurately, thereby improving the assembly quality of the heat adjustment knob 4 and the stability of the adjustment function.

[0053] like Figure 4 and Figure 11 As shown, the traction rod spring 24 is a torsion spring, including two spring bodies 241 sleeved on the rotating shaft of the lock buckle 21, and the ends of the two spring bodies 241 that are close to each other are respectively abutted against the side surfaces of the lock buckle 21 for limiting cooperation with the re-locking portion 223, and the other ends of the two spring bodies 241 that are far away from each other are connected together to form a connecting rib 242. The connecting rib 242 is a convex frame structure with an open bottom edge and two notches 243 located on both sides of the top. The top edge of the connecting rib 242 is hung in the hook groove 226 of the traction rod 22.

[0054] like Figure 3 and Figure 12As shown, the circuit breaker of this embodiment further includes a rotatable adjustment rod 6 and a magnetic adjustment knob 7, and a reset spring 60 that provides an elastic reset force for the adjustment rod 6. The electromagnetic system 5 includes a yoke 51, a rotatable armature 52, and an armature spring 53 that provides an elastic reset force for the armature 52. The armature 52 is spaced apart and opposed to the yoke 51. When the circuit breaker short-circuits, the armature 52 overcomes the elastic force of the armature spring 53 and engages with the yoke 51. Simultaneously, the armature 52 drives the drawbar 22 to rotate, releasing the lock of the re-engagement portion 223 on the lock catch 21, thereby releasing the lock catch 21 from the jump catch. The magnetic adjustment knob 7 is driven in conjunction with the adjustment rod 6, which in turn drives the armature 52. The magnetic adjustment knob 7 drives the armature 52 to rotate via the adjustment rod 6 to adjust the angle of the armature 52, thereby adjusting the distance between the armature 52 and the yoke 51 and the size of the magnetic air gap, thereby achieving a magnetically adjustable function.

[0055] It should be noted that the electromagnetic system 5 of this embodiment has various implementations. Optionally, the electromagnetic system 5 further includes a U-shaped electromagnetic system bracket 54. The armature 52 is rotatably mounted between two side edges of the electromagnetic system bracket 54. The yoke 51 is a U-shaped structure fixed within the opening of the electromagnetic system bracket 54. The opening of the yoke 51 is opposite to the armature 52, forming a through cavity between the yoke 51 and the armature 52. The two side edges of the yoke 51 are provided with inclined engaging surfaces 511. One end of the bimetallic strip 3 passes through the through cavity and is fixed to the terminal block 9 of the circuit breaker.

[0056] like Figure 12-14 As shown, the mating structure between the adjusting rod 6 and the armature 52 of this embodiment is arranged in parallel with the rotation axis of the adjusting rod 6. The armature 52 includes a driven portion 521 and an engaging portion 522 for engaging with the engaging surface 511 of the yoke 51. The driven portion 521 and the engaging portion 522 are located on either side of the rotation axis of the armature 52. A push arm 62 is provided on one side of the adjusting rod 6, drivingly engaged with the driven portion 521. The driven portion 521 and the push arm 62 are located on the same side of the line connecting the rotation axis of the adjusting rod 6 and the rotation axis of the armature 52. The adjusting rod 6 drives the armature 52 to rotate in the same direction, resulting in a compact layout of the adjusting rod 6, the armature 52, and the yoke 51, and stable and reliable transmission, thereby improving the reliability of the magnetic adjustable function.

[0057] like Figure 3 、 Figure 13 and Figure 14As shown in the figure, the matching structure between the adjustment rod 6 and the magnetic adjustment knob 7 of this embodiment is that the rotation axis of the adjustment rod 6 is perpendicular to the rotation axis of the magnetic adjustment knob 7. The lower end of the magnetic adjustment knob 7 is provided with a first magnetic adjustment plane 71, a spiral surface 72, and a second magnetic adjustment plane 73 connected in sequence. An adjustment arm 61 is extended from one side of the adjustment rod 6. The adjustment arm 61 and the push arm 62 are located on the same side of the rotation axis of the adjustment rod 6. Figure 3 As shown, when the magnetic adjustment knob 7 is rotated clockwise to adjust the circuit breaker to a momentary high gear, the adjustment arm 61 of the adjustment rod 6 is lifted upward under the action of the return spring 60, so that the first magnetic adjustment plane 71 abuts against the adjustment arm 61. At the same time, the push arm 62 of the adjustment rod 6 moves upward from the passive portion 521 of the armature 52, causing the armature 52 to rotate and the suction portion 522 of the armature 52 to move away from the suction surface 511 of the yoke 51. When the magnetic adjustment knob 7 is rotated counterclockwise to adjust the circuit breaker to a momentary low gear, the second magnetic adjustment plane 73 abuts against the adjustment arm 61, so that the adjustment arm 61 of the adjustment rod 6 is pressed downward. At the same time, the push arm 62 of the adjustment rod 6 presses downward on the passive portion 521 of the armature 52, causing the armature 52 to rotate and the suction portion 522 of the armature 52 to move toward the suction surface 511 of the yoke 51.

[0058] like Figure 2 、 Figure 10 and Figure 13 As shown, the rotation structure of the magnetic adjustment knob 7 of this embodiment, the magnetic adjustment knob 7 is provided with a second limit block 74, the middle cover 12 of the shell 1 is provided with a second mounting hole 126 that rotates with the magnetic adjustment knob 7, a second avoidance hole 127 located on the side wall of the second mounting hole 126 and used to avoid the second limit block 74, and a third stop block 128 and a fourth stop block 129 for limiting the movement stroke of the second limit block 74; when the magnetic adjustment knob 7 rotates clockwise until the second limit block 74 is blocked by the third stop block 128, the circuit breaker is in the instantaneous high gear; when the magnetic adjustment knob 7 rotates counterclockwise until the second limit block 74 is blocked by the fourth stop block 129, the circuit breaker is in the instantaneous low gear.

[0059] like Figure 3 、 Figure 15 and Figure 17As shown, the circuit breaker of this embodiment further includes a fixing frame 8. The upper end of the base 11 of the housing 1 is provided with a rotation slot that rotatably engages with the adjustment rod 6. The fixing frame 8 includes a pressure plate 81 and a fixing post 82 on one side of the pressure plate 81. The adjustment rod 6 is rotatably mounted within the rotation slot. The pressure plate 81 covers the rotation slot and is located above the adjustment rod 6. The fixing post 82 is fixed to the upper end of the base 11 by a fixing screw. The fixing post 82 is provided with a fixing screw hole 85 that engages with the fixing screw. The pressure plate 81 is provided with a vertical plate 83 located on one side of the adjustment arm 61. The vertical plate 83 is provided with a limiting post 84 on the side facing the adjustment arm 61. The return spring 60 is a torsion spring and is sleeved on the limiting post 84. The straight end of the return spring 60 abuts against the pressure plate 81, and the L-shaped end of the return spring 60 rests on the adjustment arm 61. The rotation groove on the upper end of the base 11 cooperates with the pressure plate 81 fixed on the upper end of the base 11 to limit the adjustment rod 6. The structure is simple and the adjustment rod 6 is easy to disassemble and assemble.

[0060] The circuit breaker of this embodiment has both thermal and magnetic adjustment functions. Functional customization can be achieved by rationally installing the required functional components according to usage requirements. When thermal adjustment is required, only the thermal adjustment knob 4 needs to be installed on the circuit breaker body. When magnetic adjustment is required, only the adjustment rod 6 and magnetic adjustment knob 7 need to be installed. When both thermal and magnetic adjustment are required, only the thermal adjustment knob 4, adjustment rod 6, and magnetic adjustment knob 7 need to be installed. When no adjustment function is required, the thermal adjustment knob 4, adjustment rod 6, and magnetic adjustment knob 7 are not required.

[0061] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, or are conventionally placed directions or positional relationships during use. They are intended solely for ease of description and do not imply that the devices or components referred to must have a specific direction. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely for distinction and description and should not be construed as indicating relative importance.

[0062] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A circuit breaker, comprising a housing (1), an operating mechanism (2) installed in the housing (1), and a bimetallic strip (3), wherein one end of the bimetallic strip (3) is fixed and the other end is provided with a trigger (30), the operating mechanism (2) comprises a traction rod shaft (23), a trip latch, a lock latch (21), and a traction rod (22), and a traction rod spring (24) arranged between the traction rod (22) and the lock latch (21), the traction rod shaft (23) being arranged on an operating mechanism bracket (25), the trip latch and the lock latch (21) being rotatably arranged on the operating mechanism bracket (25), and the lock latch (21) being engaged with the trip latch, and the traction rod spring (24) being used to drive the lock latch (21) to rotate in a direction engaged with the trip latch, characterized in that: The traction rod (22) comprises a rotating portion (221), a trigger portion (222) and a re-lock portion (223) integrally formed with the rotating portion (221); the rotating portion (221) is provided with a rotating hole (2211) matched with the traction rod shaft (23); the traction rod (22) is sleeved on the traction rod shaft (23) through the rotating hole (2211) and can rotate around the traction rod shaft (23) and slide along the axial direction of the traction rod shaft (23); the traction rod (22) directly locks the lock buckle (21) through the re-lock portion (223); after the bimetallic strip (3) is bent by heat, the trigger (30) touches the trigger portion (222) of the traction rod (22), causing the traction rod (22) to rotate to release the locking of the lock buckle (21) by the re-lock portion (223), thereby releasing the lock buckle (21) and the jump buckle from the buckle; It also includes a rotatable heat adjustment knob (4), which adjusts the distance between the triggering member (30) and the triggering portion (222) of the traction rod (22) by adjusting the displacement of the traction rod (22) in the axial direction of the traction rod shaft (23).

2. The circuit breaker according to claim 1, wherein: A sliding protrusion (2212) is provided in the rotating hole (2211) of the traction rod (22); a sliding groove (231) corresponding to the sliding protrusion (2212) is provided on the outer wall of the traction rod shaft (23); the sliding groove (231) has two opposite stop side walls (232); the sliding protrusion (2212) is slidably arranged in the sliding groove (231) and is located between the two stop side walls (232).

3. The circuit breaker according to claim 2, wherein: The axial front end of the traction rod shaft (23) is provided with a frustum (233) for avoiding the sliding protrusion (2212).

4. The circuit breaker according to claim 2, wherein: A positioning cone (234) is provided at the axial end of the traction rod shaft (23), and a positioning step (2213) is provided in the rotating hole (2211) for blocking and cooperating with the positioning cone (234) in the axial direction of the traction rod shaft (23).

5. The circuit breaker according to claim 1, wherein: A first heat regulating plane (2221), a transition slope (2222), and a second heat regulating plane (2223) connected in sequence are provided on the side of the trigger portion (222) facing the trigger member (30); the heat regulating knob (4) regulates the circuit breaker so that the trigger member (30) is opposite to the first heat regulating plane (2221) when the circuit breaker is in a high delay position, and so that the trigger member (30) is opposite to the second heat regulating plane (2223) when the circuit breaker is in a low delay position.

6. The circuit breaker according to claim 1, wherein: An adjustment slot (224) is provided on one side of the rotating portion (221), and an eccentric shaft (41) inserted into the adjustment slot (224) is provided at one end of the heat adjustment knob (4).

7. The circuit breaker according to claim 1, wherein: The heat regulating knob (4) is rotatably mounted on the housing (1); the heat regulating knob (4) is provided with a first limit block (42); the housing (1) is provided with a first mounting hole (121) rotatably engaged with the heat regulating knob (4); a first avoidance hole (122) located on a side wall of the first mounting hole (121) and used for avoiding the first limit block (42); and a first stop block (123) and a second stop block (124) for limiting the movement stroke of the first limit block (42).

8. The circuit breaker according to claim 7, wherein: A positioning spring (40) is provided between the heat regulating knob (4) and the housing (1); an annular groove (43) is provided on the outer wall of the heat regulating knob (4); the arc-shaped end of the positioning spring (40) is snapped into the annular groove (43); and the straight end of the positioning spring (40) is snapped into the straight snap groove (125) on the housing (1).

9. The circuit breaker according to claim 1, wherein: The invention also includes an electromagnetic system (5), an adjusting rod (6) and a magnetic adjusting knob (7) which are respectively arranged to rotate, and a reset spring (60) which provides an elastic reset force for the adjusting rod (6). The electromagnetic system (5) includes a magnetic yoke (51), a rotatable armature (52), and an armature spring (53) which provides an elastic reset force for the armature (52). The armature (52) and the magnetic yoke (51) are arranged relative to each other with a distance. When the circuit breaker is short-circuited, the armature (52) overcomes the elastic force of the armature spring (53) and resets the armature (53) to the magnetic yoke (51). 1) is attracted, and at the same time, the armature (52) drives the traction rod (22) to rotate to release the locking of the lock buckle (21) by the re-locking part (223), so that the lock buckle (21) and the jump buckle are released from the buckle fit; the magnetic adjustment knob (7) is driven to cooperate with the adjustment rod (6), and the adjustment rod (6) is driven to cooperate with the armature (52). The magnetic adjustment knob (7) drives the armature (52) to rotate through the adjustment rod (6) to adjust the angle of the armature (52), thereby adjusting the distance between the armature (52) and the magnetic yoke (51).

10. The circuit breaker according to claim 9, characterized in that: The rotation axis of the regulating rod (6) is arranged parallel to the rotation axis of the armature (52); the armature (52) comprises a driven portion (521) and an engaging portion (522) for engaging with the engaging surface (511) of the magnetic yoke (51); the driven portion (521) and the engaging portion (522) are located on both sides of the rotation axis of the armature (52); a push arm (62) is extended from one side of the regulating rod (6) and is driven by the driven portion (521); the driven portion (521) and the push arm (62) are located on the same side of a line connecting the rotation axis of the regulating rod (6) and the rotation axis of the armature (52).

11. The circuit breaker according to claim 9, wherein: The rotation axis of the regulating rod (6) is arranged perpendicular to the rotation axis of the magnetic regulating knob (7); the lower end of the magnetic regulating knob (7) is provided with a first magnetic regulating plane (71), a spiral surface (72), and a second magnetic regulating plane (73) connected in sequence; an regulating arm (61) is extended from one side of the regulating rod (6); when the magnetic regulating knob (7) regulates the circuit breaker to a momentary high gear, the first magnetic regulating plane (71) abuts against the regulating arm (61); when the circuit breaker is in a momentary low gear, the second magnetic regulating plane (73) abuts against the regulating arm (61).

12. The circuit breaker according to claim 9, wherein: The magnetic adjustment knob (7) is rotatably mounted on the housing (1); the magnetic adjustment knob (7) is provided with a second limit block (74); the housing (1) is provided with a second mounting hole (126) rotatably engaged with the magnetic adjustment knob (7); a second avoidance hole (127) located on the side wall of the second mounting hole (126) and used for avoiding the second limit block (74); and a third stop block (128) and a fourth stop block (129) for limiting the movement stroke of the second limit block (74).

13. The circuit breaker according to claim 9, wherein: The invention also includes a fixing frame (8), wherein the upper end of the base (11) of the housing (1) is provided with a rotation groove that rotates with the adjustment rod (6), and the fixing frame (8) includes a pressure plate (81) and a fixing column (82) on one side of the pressure plate (81), and the adjustment rod (6) is rotatably installed in the rotation groove, the pressure plate (81) covers the rotation groove and is located above the adjustment rod (6), and the fixing column (82) is fixed to the upper end of the base (11) by a fixing screw, and the fixing column (82) is provided with a fixing screw hole (85) that cooperates with the fixing screw.

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