Circuit breaker

Abstract

The utility model belongs to the technical field of low-voltage electric appliances, and discloses a circuit breaker, which comprises a shell, a draw bar, a release and a first adjusting piece, and is characterized in that the draw bar is rotationally arranged in the shell; the release comprises a support fixed in the shell, a magnet yoke fixed on the support, an armature rotationally arranged on the support and a spring connected with the armature, the armature rotates relative to the support and has a first position and a second position, and the spring enables the armature to have a trend of rotating from the first position to the second position; the armature abuts against the draw bar at the first position and enables the draw bar to trigger the circuit breaker to trip, and the armature is separated from the draw bar at the second position; the first adjusting piece is arranged in the shell and connected with the spring, and the position of the first adjusting piece relative to the release is adjustable. According to the circuit breaker provided by the utility model, the position of the first adjusting piece is adjusted relative to the release so as to adjust the stretching length of the spring, that is, the tension of the spring on the armature is adjusted, so that the magnetic protection multiple of the circuit breaker is adjusted.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to a circuit breaker. Background Technology

[0002] A circuit breaker is a switching device that can close, carry, and interrupt current under normal circuit conditions and can close, carry, and interrupt current under abnormal circuit conditions within a specified time.

[0003] In related technologies, circuit breakers typically provide short-circuit protection through a trip unit consisting of a bracket, spring, magnetic yoke, and armature. The magnetic yoke is fixed to the bracket, the armature is rotatably mounted on the bracket, and the two ends of the spring are connected to the bracket and the armature respectively. The spring acts on the armature; when a short circuit occurs, the armature, attracted by the magnetic yoke, overcomes the spring and rotates, triggering the circuit breaker to trip. However, the spring's extension length when triggering tripping is a fixed value, meaning the circuit breaker typically only provides protection against short circuits within its rated current range. If the circuit breaker is used in applications outside its rated current range, it will be difficult to provide effective protection. Utility Model Content

[0004] The purpose of this utility model is to provide a circuit breaker in which the extension length of the spring is adjustable when the circuit breaker is triggered to trip.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A circuit breaker is provided, comprising:

[0007] shell;

[0008] The traction rod is rotatably mounted inside the housing.

[0009] The trip unit includes a bracket fixed inside the housing, a magnetic yoke fixed on the bracket, an armature rotatably mounted on the bracket, and a spring connected to the armature. The armature has a first position and a second position relative to the bracket. The spring causes the armature to tend to rotate from the first position to the second position. In the first position, the armature abuts against the traction rod and causes the traction rod to trigger the circuit breaker to trip. In the second position, the armature remains separated from the traction rod.

[0010] A first adjusting member is disposed inside the housing and connected to the spring, and the position of the first adjusting member relative to the trip unit is adjustable. The first adjusting member is used to adjust the extension length of the spring.

[0011] Optionally, the circuit breaker further includes a guide member fixed inside the housing, the guide member having a first guide slope, the first adjusting member having a second guide slope, the first guide slope and the second guide slope being in contact, and the first adjusting member being able to slide relative to the first guide slope via the second guide slope to adjust the extension length of the spring.

[0012] Optionally, the guide member is provided with a guide protrusion, the guide protrusion having a first guide slope, the first adjusting member is provided with a guide groove, the guide groove having a second guide slope, and the guide protrusion is slidably inserted into the guide groove.

[0013] Optionally, the outer shell is provided with a partition, the guide is fixed to the top surface of the partition, and the top surface of the partition is provided with a limiting protrusion, and the first adjusting member is sandwiched between the limiting protrusion and the guide.

[0014] Optionally, the first adjusting member is provided with a positioning groove, and the circuit breaker further includes a first positioning member rotatably disposed on the housing. The first positioning member has an eccentric shaft, the center line of which is parallel to the rotation axis of the first positioning member, and the eccentric shaft is slidably inserted into the positioning groove.

[0015] Optionally, the trip unit further includes a first adjusting screw, which is threadedly connected to the bracket or guide, and a first end of the first adjusting screw can abut against the armature to limit the armature to the second position.

[0016] Optionally, the first adjusting member is rotatably disposed within the housing, and the rotation of the first adjusting member can adjust the extension length of the spring.

[0017] Optionally, the armature includes a main body and two rotating protrusions on the main body, and the bracket includes two support arms;

[0018] One of the two support arms is provided with a first through hole, and the other is provided with an opening groove. One of the two rotating protrusions is inserted into the first through hole, and the other is inserted into the opening groove; or, both support arms are provided with a second through hole, and the two rotating protrusions are arranged in a one-to-one correspondence with the two second through holes, and the rotating protrusions are inserted into the corresponding second through holes.

[0019] Optionally, the armature is provided with a first hooking part, the first adjusting member is provided with a second hooking part, one of the two hooks of the spring is hooked to the first hooking part, and the other is hooked to the second hooking part.

[0020] Optionally, the circuit breaker further includes a conductive bar disposed within the housing, the conductive bar including a first plate portion perpendicular to the depth direction of the housing, and the magnetic yoke being clamped between the bracket and the first plate portion.

[0021] Beneficial effects: The circuit breaker provided by this utility model, when the circuit breaker is short-circuited, the magnetic force generated by the yoke acts on the armature, the armature rotates from the second position to the first position and pushes the traction rod to rotate, so that the traction rod triggers the circuit breaker to trip. The first adjusting member adjusts its position relative to the trip unit to adjust the spring's extension length; that is, the spring's extension length is adjusted in both the first and second positions of the armature.

[0022] When the extension length of the spring is shortened by the first adjusting member, the circuit breaker is suitable for applications with a current smaller than its own rated current, and the tension of the spring on the armature decreases; when the circuit breaker is short-circuited, the attraction of the yoke on the armature decreases, and the armature can overcome the tension of the spring and rotate from the second position to the first position under the magnetic attraction of the yoke, thus achieving short-circuit protection.

[0023] When the extension length of the spring is increased by the first adjusting component, the circuit breaker is suitable for applications with a current greater than its rated current, and the tension of the spring on the armature increases. When the circuit breaker is short-circuited, the attraction of the yoke on the armature increases, and the armature can overcome the tension of the spring and rotate from the second position to the first position under the magnetic attraction of the yoke, thus achieving short-circuit protection. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the internal structure of the circuit breaker provided by this utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the outer shell provided by this utility model;

[0026] Figure 3 This is a schematic diagram of the trip unit provided by this utility model;

[0027] Figure 4 This is an exploded view of the trip unit provided by this utility model;

[0028] Figure 5 This is a structural schematic diagram of one embodiment of the bracket provided by this utility model;

[0029] Figure 6 This is a structural schematic diagram of one embodiment of the armature provided by this utility model;

[0030] Figure 7 This is a partially exploded view of the circuit breaker provided by this utility model;

[0031] Figure 8This is a schematic diagram of the circuit breaker provided by this utility model inside the bottom shell;

[0032] Figure 9 This is a schematic diagram of the connection structure between the rotatable first adjusting member and the trip unit provided by this utility model;

[0033] Figure 10 This is another internal structure diagram of the circuit breaker provided by this utility model;

[0034] Figure 11 This is a schematic diagram of the structure of the second adjusting member provided by this utility model.

[0035] In the picture:

[0036] 100. Outer shell; 110. Base; 111. Partition; 112. Limiting protrusion; 120. Top cover;

[0037] 200. Traction rod; 210. Limiting plate; 211. Long strip hole; 212. Clearance hole;

[0038] 300. Trigger; 310. Bracket; 311. Support arm; 3111. First through hole; 3112. Opening slot; 3113. Second through hole; 3114. Bending part; 3115. Support rod; 3116. Clearance part; 312. Fixing plate; 320. Magnetic yoke; 321. Base plate; 322. Support plate; 330. Armature; 331. Rotating protrusion; 332. First hook part; 333. Extension rod; 334. Main body; 3341. First folding plate; 3342. Second folding plate; 340. Spring; 350. First adjusting screw;

[0039] 400. First adjusting component; 401. Second mounting part; 402. Guide groove; 403. Positioning groove; 410. Second guide slope; 420. Protrusion; 431. Shaft; 432. Connecting rod;

[0040] 500, Guide component; 510, First guide ramp; 520, Guide protrusion; 530, Connecting block; 540, Connecting lug;

[0041] 610. First positioning component; 611. Eccentric shaft; 612. Main shaft section; 613. Fan ring section; 614. Positioning table; 620. Second positioning component;

[0042] 700, Conductive busbar; 710, First plate section; 720, Second plate section;

[0043] 800. Thermo-bimetallic component; 810. Second adjusting screw;

[0044] 900, Second adjusting component; 901, Force-bearing surface; 910, Adjusting plate; 920, Guide shaft; 930, Protrusion. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0046] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0047] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0049] Reference Figures 1 to 3 As shown, this embodiment provides a circuit breaker, which includes a housing 100, a traction rod 200, a trip unit 300, and a first adjusting member 400.

[0050] Specifically, the traction rod 200 is rotatably disposed within the housing 100; the trip unit 300 includes a bracket 310 fixed within the housing 100, a magnetic yoke 320 fixed on the bracket 310, an armature 330 rotatably disposed on the bracket 310, and a spring 340 connected to the armature 330. The armature 330 has a first position and a second position relative to the bracket 310. The spring 340 causes the armature 330 to have a tendency to rotate from the first position to the second position. In the first position, the armature 330 abuts against the traction rod 200 and causes the traction rod 200 to trigger the circuit breaker to trip. In the second position, the armature 330 remains separated from the traction rod 200. The first adjusting member 400 is disposed within the housing 100 and connected to the spring 340. The position of the first adjusting member 400 relative to the trip unit 300 is adjustable. The first adjusting member 400 is used to adjust the extension length of the spring 340.

[0051] It is understandable that the position of the first adjusting member 400 relative to the trip unit 300 is adjustable to adjust the extension length of the spring 340, that is, the extension length of the spring 340 in both the first and second positions of the armature 330 is adjusted.

[0052] Understandably, when the circuit breaker is short-circuited, the attraction force generated by the magnetic yoke 320 acts on the armature 330, and the armature 330 rotates from the second position to the first position and pushes the traction rod 200 to rotate, so that the traction rod 200 triggers the circuit breaker to trip. By adjusting the extension length of the spring 340 through the first adjusting member 400, the magnetic protection multiple of the circuit breaker can be adjusted.

[0053] For example, when the extension length of the spring 340 is shortened by the first adjusting member 400, the circuit breaker is suitable for application scenarios with a current smaller than its own rated current, and the tension of the spring 340 on the armature 330 decreases; when the circuit breaker is short-circuited, the attraction of the yoke 320 on the armature 330 decreases, and the armature 330 can overcome the tension of the spring 340 and rotate from the second position to the first position under the magnetic attraction of the yoke 320, thereby achieving short-circuit protection.

[0054] For example, when the extension length of the spring 340 is increased by the first adjusting member 400, the circuit breaker is suitable for application scenarios with a current greater than its own rated current, and the tension of the spring 340 on the armature 330 increases; when the circuit breaker is short-circuited, the attraction of the yoke 320 on the armature 330 increases, and the armature 330 can overcome the tension of the spring 340 and rotate from the second position to the first position under the magnetic attraction of the yoke 320, thereby achieving short-circuit protection.

[0055] In this embodiment, reference is made to Figures 4 to 6 As shown, the armature 330 includes a main body 334 and two rotating protrusions 331 provided on the main body 334, and the bracket 310 includes two support arms 311.

[0056] In one feasible implementation, such as Figure 5 and Figure 6 As shown, one of the two support arms 311 is provided with a first through hole 3111, and the other is provided with an opening groove 3112. One of the two rotating protrusions 331 is inserted into the first through hole 3111, and the other is inserted into the opening groove 3112, so as to realize the rotatable connection between the armature 330 and the bracket 310. In some embodiments, the first through hole 3111 and the opening groove 3112 are both provided on the armature 330, and the rotating protrusion 331 is provided on the bracket 310; or, one of the first through hole 3111 and the opening groove 3112 is provided on the bracket 310, the other of the first through hole 3111 and the opening groove 3112 is provided on the armature 330, and one of the two rotating protrusions 331 is provided on the bracket 310, and the other of the two rotating protrusions 331 is provided on the armature 330.

[0057] In another feasible implementation, such as Figure 4 As shown, each of the two support arms 311 is provided with a second through hole 3113, and two rotating protrusions 331 are provided corresponding to the two second through holes 3113. The rotating protrusions 331 are inserted into the corresponding second through holes 3113 to realize the rotatable connection between the armature 330 and the bracket 310. In some embodiments, the second through hole 3113 is provided on the armature 330 and the rotating protrusion 331 is provided on the bracket 310; or, one of the two second through holes 3113 is provided on the bracket 310 and the other of the two second through holes 3113 is provided on the armature 330, and one of the two rotating protrusions 331 is provided on the bracket 310 and the other of the two rotating protrusions 331 is provided on the armature 330.

[0058] Of course, the bracket 310 and the armature 330 can also be rotatably connected through other connecting structures, which is not limited in this embodiment.

[0059] For example, taking one of the two support arms 311 having a first through hole 3111 and the other having an opening slot 3112, when installing the armature 330, one rotating protrusion 331 can be first inserted into the first through hole 3111, and then the other rotating protrusion 331 can be inserted into the opening slot 3112 through the opening, which facilitates assembly. It can be understood that, for ease of assembly, the rotating protrusion 331 and the first through hole 3111 can be in clearance fit.

[0060] For example, the bracket 310 also includes a fixing plate 312, with support arms 311 respectively provided on opposite sides of the fixing plate 312, and a magnetic yoke 320 disposed on the fixing plate 312 and located between the two support frames.

[0061] For example, the bracket 310 may be U-shaped.

[0062] In one feasible implementation, such as Figure 4 As shown, the magnetic yoke 320 includes a base plate 321 and support plates 322 disposed on both sides of the base plate 321. The support plates 322 are fixed to the bracket 310. Specifically, the support plates 322 are fixed to the fixing plate 312. For example, the support plates 322 can abut against the armature 330 to limit the armature 330 to a first position.

[0063] For example, the magnetic yoke 320 can be U-shaped.

[0064] For example, the support plate 322 and the fixing plate 312 can be riveted together.

[0065] In one feasible implementation, such as Figure 4 As shown, the armature 330 is provided with an extension rod 333. The armature 330 pushes the traction rod 200 to rotate through the extension rod 333. The extension rod 333 can facilitate the internal layout of the circuit breaker and make the structure of the circuit breaker more compact.

[0066] In one feasible implementation, such as Figure 4 , Figure 6 and Figure 7 As shown, the armature 330 is provided with a first hooking part 332, and the first adjusting member 400 is provided with a second hooking part 401. One of the two hooks of the spring 340 is hooked to the first hooking part 332, and the other is hooked to the second hooking part 401, which facilitates assembly.

[0067] For example, the first hook portion 332 may be in the shape of a hook, or the first hook portion 332 may have a through hole through which the hook of the spring 340 may pass.

[0068] For example, the second hook portion 401 may be in the shape of a hook, or the second hook portion 401 may have a through hole through which the hook of the spring 340 may pass.

[0069] In one feasible implementation, such as Figure 4 As shown, the main body 334 of the armature 330 can be configured as a flat plate. In another feasible embodiment, such as Figure 6 As shown, the main body 334 of the armature 330 includes a first folding plate 3341 and a second folding plate 3342 that fold together. The second folding plate 3342 is located on the side of the first folding plate 3341 facing the magnetic yoke 320. The arrangement of the first folding plate 3341 and the second folding plate 3342 can increase the attraction force of the magnetic yoke 320 on the armature 330.

[0070] For example, the rotating protrusion 331 is provided on the second folding plate 3342.

[0071] For example, the extension rod 333 is provided on the second folding plate 3342.

[0072] For example, the first hook part 332 is provided on the second folding plate 3342.

[0073] In some embodiments, refer to Figure 1 , Figure 2 and Figure 7 As shown, the circuit breaker also includes a guide member 500 fixed inside the housing 100. The guide member 500 has a first guide slope 510, and the first adjusting member 400 has a second guide slope 410. The first guide slope 510 and the second guide slope 410 are in contact with each other. The first adjusting member 400 can slide relative to the first guide slope 510 through the second guide slope 410 to adjust the extension length of the spring 340, which is convenient for adjustment. It can be understood that under the action of the spring 340, the first guide slope 510 and the second guide slope 410 of the first adjusting member 400 always remain in contact.

[0074] For example, such as Figure 7 As shown, when the first adjusting member 400 slides to the left in cooperation with the second guide inclined surface 410 and the first guide inclined surface 510, the first adjusting member 400 will move upward, thereby lengthening the extension length of the spring 340; when the first adjusting member 400 slides to the right in cooperation with the second guide inclined surface 410 and the first guide inclined surface 510, the first adjusting member 400 will move downward, thereby shortening the extension length of the spring 340.

[0075] For example, the guide 500 may be plate-shaped.

[0076] In one feasible implementation, such as Figure 7 As shown, the guide member 500 is provided with a guide protrusion 520, which has a first guide slope 510. The first adjusting member 400 is provided with a guide groove 402, which has a second guide slope 410. The guide protrusion 520 is slidably inserted into the guide groove 402, facilitating the positioning and assembly of the first adjusting member 400. In another feasible embodiment, the guide protrusion 520 is provided on the first adjusting member 400, and the guide groove 402 is provided on the guide member 500.

[0077] For example, the shapes of the guide protrusion 520 and the guide groove 402 include, but are not limited to, triangular or trapezoidal shapes.

[0078] In one feasible implementation, such as Figure 8As shown, the outer casing 100 is provided with a partition 111, and a guide member 500 is fixed to the top surface of the partition 111. A limiting protrusion 112 is provided on the top surface of the partition 111. A first adjusting member 400 is sandwiched between the limiting protrusion 112 and the guide member 500, facilitating the positioning and assembly of the first adjusting member 400. Under the limiting of the limiting protrusion 112 and the partition 111, the first adjusting member 400 can only slide along the width and depth directions of the outer casing 100, ensuring stable and reliable adjustment of the extension length of the spring 340. The width direction of the outer casing 100 is set as... Figure 8 In the width direction, the depth direction of the outer shell 100 is set as... Figure 8 The depth direction.

[0079] For example, the housing 100 is provided with at least one partition 111, such as two or three.

[0080] For example, the housing 100 includes a base 110 and a top cover 120 disposed on the base 110, and a partition 111 is disposed on the base 110.

[0081] For example, the guide member 500 can be fixed to the base 110 by bolt fastening. The guide member 500 is provided with a connecting block 530, which has a mounting hole (not shown). The bolt passes through the mounting hole and is threadedly connected to the partition plate 111. Of course, the guide member 500 can also be fixed to the base 110 by snap-fit ​​or other means; this embodiment does not limit this.

[0082] For example, the connecting block 530 is provided with at least one corresponding to the partition 111, and the bolt passes through the mounting hole and is threadedly connected to the corresponding partition 111.

[0083] In one feasible implementation, such as Figure 1 , Figure 7 and Figure 8 As shown, the first adjusting member 400 is provided with a positioning groove 403. The circuit breaker also includes a first positioning member 610 rotatably mounted on the housing 100. The first positioning member 610 has an eccentric shaft 611, the center line of which is parallel to the rotation axis of the first positioning member 610. The eccentric shaft 611 is slidably inserted into the positioning groove 403. In this embodiment, rotating the first positioning member 610 causes the eccentric shaft 611 to push against the groove wall of the positioning groove 403, thereby pushing the first adjusting member 400 to slide, thus realizing the adjustment of the extension length of the spring 340, which is stable and reliable.

[0084] For example, the first adjusting member 400 is provided with two protrusions 420, and a positioning groove 403 is formed between the two protrusions 420, which is beneficial to improving the structural strength of the first adjusting member 400 and facilitating the molding and manufacturing of the first adjusting member 400.

[0085] For example, the end of the first positioning member 610 away from the eccentric shaft 611 is exposed outside the housing 100, meaning that the first positioning member 610 can be rotated outside the housing 100 to facilitate adjustment of the extension length of the spring 340. Of course, the end of the first positioning member 610 away from the eccentric shaft 611 can also be located inside the housing 100.

[0086] For example, the first positioning member 610 includes a main shaft portion 612, an eccentric shaft 611 is disposed at one end of the main shaft portion 612, and the main shaft portion 612 is rotatably connected to the outer casing 100. Specifically, the top cover 120 is provided with a connecting hole (not shown), and the main shaft portion 612 is rotatably disposed in the connecting hole.

[0087] For example, the first positioning member 610 further includes a fan ring portion 613 disposed on the main shaft portion 612. The two ends of the fan ring portion 613 can form a limiting engagement with the housing 100, that is, limit the rotation angle of the first positioning member 610, thereby limiting the adjustment range of the extension length of the spring 340. For example, a limiting block (not shown) may be provided on the top cover 120 or the guide member 500, and the two ends of the fan ring portion 613 can form a limiting engagement with the limiting block.

[0088] Exemplarily, the first positioning member 610 also has a positioning platform 614, which and the fan ring portion 613 are clamped at both ends of the connecting hole. Exemplarily, to facilitate the clamping of the positioning platform 614 and the fan ring portion 613 at both ends of the connecting hole, the top cover 120 may also be provided with a relief groove (not shown) communicating with the connecting hole, through which the fan ring portion 613 can pass and move into the connecting hole. The main shaft portion 612 can be engaged within the connecting hole and rotatably connected to it.

[0089] In other embodiments, reference is made to Figure 9 As shown, the first adjusting member 400 is rotatably disposed within the outer casing 100, and the rotation of the first adjusting member 400 can adjust the extension length of the spring 340. The rotation axis of the first adjusting member 400 is parallel to the rotation axis of the traction rod 200.

[0090] For example, the first adjusting member 400 includes a shaft 431 and a connecting rod portion 432 disposed around the periphery of the shaft 431, the connecting rod portion 432 being connected to the spring 340. In this embodiment, the first adjusting member 400 is rotatably connected to the housing 100 via the shaft 431. The rotation of the shaft 431 drives the connecting rod to rotate around the axis of the shaft 431, so that one end of the spring 340 connected to the connecting rod portion 432 approaches or moves away from the end of the spring 340 connected to the armature 330, thereby realizing the adjustment of the extension length of the spring 340.

[0091] In this embodiment, reference is made to Figure 3 , Figure 4 and Figure 7As shown, the trip unit 300 also includes a first adjusting screw 350, which is threadedly connected to the bracket 310 or the guide 500. The first end of the first adjusting screw 350 can abut against the armature 330 to limit the armature 330 to a second position. It is understood that rotating the first adjusting screw 350 allows it to move axially, thereby adjusting the second position of the armature 330. It is understood that there is a gap between the armature 330 and the yoke 320 in the second position. Adjusting the second position of the armature 330 adjusts the size of this gap, thereby adjusting the magnetic force exerted by the yoke 320 on the armature 330 in the second position and adjusting the extension length of the spring 340 when the armature 330 is in the second position. In conjunction with the first adjusting member 400, dual adjustment of the tripping function of the trip unit 300 can be achieved, further improving the applicability of the circuit breaker.

[0092] For example, the second end of the first adjusting screw 350 is provided with a slotted groove to facilitate tool turning.

[0093] In some embodiments, one of the two support arms 311 of the bracket 310 is provided with a bent portion 3114, and a first adjusting screw 350 is threadedly connected to the bent portion 3114. In other embodiments, the guide member 500 is provided with a connecting lug 540, and a first adjusting screw 350 is threadedly connected to the connecting lug 540.

[0094] In one feasible implementation, such as Figure 5 As shown, one of the two support arms 311 of the bracket 310 is provided with a support rod 3115, and a bent portion 3114 is provided at the end of the support rod 3115 away from the support arm 311; in other words, the support rod 3115 is bent to form a bent portion 3114.

[0095] In one feasible embodiment, the end of the support rod 3115 away from the support arm 311 is provided with a clearance portion 3116, which is connected to the bending portion 3114. The clearance portion 3116 forms a clearance space for the armature 330 to avoid interference. It is understood that both the clearance portion 3116 and the bending portion 3114 are formed by bending the end of the support rod 3115 away from the support arm 311. Exemplarily, a U-shaped groove is formed between the clearance portion 3116 and the bending portion 3114, with the opening of the U-shaped groove facing the other of the two support arms 311.

[0096] In this embodiment, reference is made to Figure 3 and Figure 10As shown, the circuit breaker also includes a conductive busbar 700 disposed within the housing 100. The conductive busbar 700 includes a first plate portion 710, which is perpendicular to the depth direction of the housing 100. A magnetic yoke 320 is sandwiched between a bracket 310 and the first plate portion 710. Specifically, the base plate 321 of the magnetic yoke 320 is sandwiched between the first plate portion 710 and the fixing plate 312 of the bracket 310, so that the trip unit 300 is placed laterally, which helps to improve the structural compactness of the circuit breaker. The conductive busbar 700 can be electrically connected to the moving contact (not shown) of the circuit breaker.

[0097] For example, combined Figure 8 As shown, the length direction of the first plate portion 710 extends along the length direction of the outer casing 100. The length direction of the outer casing 100 can be set as follows: Figure 8 The length direction in the middle.

[0098] For example, the first plate 710, the base plate 321 and the fixing plate 312 can be riveted together.

[0099] For example, multiple conductive bars 700 are arranged side by side along the width direction of the housing 100. It can be understood that the partition 111 on the housing 100 divides the housing 100 into multiple mounting slots, and the conductive bars 700 are arranged in a one-to-one correspondence with the mounting slots. The conductive bars 700 are disposed in the corresponding mounting slots to effectively prevent electrical conduction between adjacent conductive bars 700.

[0100] For example, the trip unit 300 is provided in multiple ways and is configured one-to-one with the conductive busbar 700.

[0101] In this embodiment, reference is made to Figure 10 and Figure 11 As shown, the circuit breaker also includes a thermal bimetallic element 800 fixed on the conductor bar 700. When an overload current is applied to the circuit breaker, the thermal bimetallic element 800 can bend and push the traction rod 200 to rotate, so that the traction rod 200 triggers the circuit breaker to trip.

[0102] For example, the conductive bus 700 further includes a second plate portion 720 disposed at an angle to the first plate portion 710, and the thermal bimetallic member 800 is fixed to the second plate portion 720. For example, the angle between the first plate portion 710 and the second plate portion 720 can be 90°, 105° or 120°.

[0103] In one feasible embodiment, the bimetallic element 800 is provided with a second adjusting screw 810, and a second adjusting member 900 is slidably provided on the traction rod 200, with a force-bearing surface 901 on the second adjusting member 900. The bimetallic element 800 can bend to push against the force-bearing surface 901 via the second adjusting screw 810, thereby triggering the circuit breaker tripping by the traction rod 200. It is understood that adjusting the position of the second adjusting member 900 relative to the traction rod 200 adjusts the contact point between the second adjusting screw 810 and the force-bearing surface 901. Different contact points between the second adjusting screw 810 and the force-bearing surface 901 result in different bending angles of the bimetallic element 800 required for the second adjusting screw 810 to push against the force-bearing surface 901 until the traction rod 200 triggers the circuit breaker tripping. In other words, by adjusting the position of the second adjusting member 900 relative to the traction rod 200, the stroke of the second adjusting screw 810 when an overload current is applied to the circuit breaker can be adjusted; when the traction rod 200 triggers the circuit breaker to trip, the greater the bending amplitude of the thermal bimetallic member 800, the greater the stroke of the second adjusting screw 810; the smaller the bending amplitude of the thermal bimetallic member 800, the smaller the stroke of the second adjusting screw 810.

[0104] It is understandable that the second adjusting screw 810 corresponds one-to-one with the force-bearing surface 901.

[0105] It is understood that the second adjusting screw 810 is threadedly connected to the hot bimetallic element 800. Tightening the second adjusting screw 810 allows it to move axially, and can also adjust the bending radius of the hot bimetallic element 800 required when the traction rod 200 triggers the circuit breaker tripping. Combined with the second adjusting element 900, dual adjustment can be achieved, further improving the applicability of the circuit breaker. For example, a screw sleeve (not shown) is threadedly connected to the second adjusting screw 810. The screw sleeve abuts against the hot bimetallic element 800, effectively preventing the second adjusting screw 810 from rotating relative to the hot bimetallic element 800. The screw sleeve can be located on the side of the hot bimetallic element 800 away from the force-bearing surface 901.

[0106] For example, the force-bearing surface 901 includes, but is not limited to, an inclined surface or an arc surface.

[0107] In one feasible embodiment, the circuit breaker further includes a second positioning member 620 rotatably disposed on the guide member 500. The structure of the second positioning member 620 is the same as that of the first positioning member 610, and the connection method between the second positioning member 620 and the second adjusting member 900 is the same as that between the first positioning member 610 and the first adjusting member 400. This embodiment will not elaborate further.

[0108] In one feasible embodiment, the second adjusting member 900 includes an adjusting plate 910 and a guide shaft 920 disposed on the adjusting plate 910. The guide shaft 920 is stepped, and its small end is connected to the adjusting plate 910. The traction rod 200 has a limiting plate 210 with an elongated hole 211. The small end of the guide shaft 920 passes through the elongated hole 211, and the limiting plate 210 is sandwiched between the adjusting plate 910 and the large end of the guide shaft 920. The extension rod 333 of the armature 330 can push against the limiting plate 210 to trigger the circuit breaker tripping mechanism.

[0109] For example, at least two guide shafts 920 and elongated holes 211 are provided and correspond one-to-one, so that the second adjusting member 900 can be stably adjusted in position along the width direction of the housing 100.

[0110] For example, the second adjusting member 900 further includes a protrusion 930 provided on the adjusting plate 910, and a force-bearing surface 901 provided on the protrusion 930. It can be understood that the protrusion 930 and the force-bearing surface 901 correspond one-to-one.

[0111] For example, to facilitate the assembly of the second adjusting member 900, one end of the elongated hole 211 is connected to a relief hole 212. The diameter of the relief hole 212 is larger than the diameter of the large end of the guide shaft 920. That is, the large end of the guide shaft 920 can be passed through the relief hole 212 first, and then the small end of the guide shaft 920 can be slid into the elongated hole 211 for easy assembly.

[0112] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A circuit breaker, characterized in that, include: Outer shell (100); The traction rod (200) is rotatably disposed within the housing (100); The trip unit (300) includes a bracket (310) fixed inside the housing (100), a magnetic yoke (320) fixed on the bracket (310), an armature (330) rotatably disposed on the bracket (310), and a spring (340) connected to the armature (330). The armature (330) has a first position and a second position relative to the bracket (310). The spring (340) causes the armature (330) to have a tendency to rotate from the first position to the second position. In the first position, the armature (330) abuts against the traction rod (200) and causes the traction rod (200) to trigger the circuit breaker to trip. In the second position, the armature (330) remains separated from the traction rod (200). A first adjusting member (400) is disposed inside the housing (100) and connected to the spring (340), and the position of the first adjusting member (400) relative to the trip unit (300) is adjustable. The first adjusting member (400) is used to adjust the extension length of the spring (340).

2. The circuit breaker according to claim 1, characterized in that, The circuit breaker further includes a guide member (500) fixed inside the housing (100). The guide member (500) is provided with a first guide slope (510), and the first adjusting member (400) is provided with a second guide slope (410). The first guide slope (510) and the second guide slope (410) are in contact. The first adjusting member (400) can slide relative to the first guide slope (510) through the second guide slope (410) to adjust the extension length of the spring (340).

3. The circuit breaker according to claim 2, characterized in that, The guide member (500) is provided with a guide protrusion (520), the guide protrusion (520) has a first guide slope (510), the first adjusting member (400) is provided with a guide groove (402), the guide groove (402) has a second guide slope (410), and the guide protrusion (520) is slidably inserted into the guide groove (402).

4. The circuit breaker according to claim 2, characterized in that, The outer shell (100) is provided with a partition (111), the guide (500) is fixed on the top surface of the partition (111), and the top surface of the partition (111) is provided with a limiting protrusion (112). The first adjusting member (400) is sandwiched between the limiting protrusion (112) and the guide (500).

5. The circuit breaker according to claim 2, characterized in that, The first adjusting member (400) is provided with a positioning groove (403). The circuit breaker also includes a first positioning member (610) rotatably disposed on the housing (100). The first positioning member (610) has an eccentric shaft (611). The center line of the eccentric shaft (611) is arranged parallel to the rotation axis of the first positioning member (610). The eccentric shaft (611) is slidably inserted into the positioning groove (403).

6. The circuit breaker according to claim 2, characterized in that, The trip unit (300) further includes a first adjusting screw (350), which is threadedly connected to the bracket (310) or the guide (500), and the first end of the first adjusting screw (350) can abut against the armature (330) to limit the armature (330) to the second position.

7. The circuit breaker according to claim 1, characterized in that, The first adjusting member (400) is rotatably disposed inside the housing (100), and the rotation of the first adjusting member (400) can adjust the extension length of the spring (340).

8. The circuit breaker according to claim 1, characterized in that, The armature (330) includes a main body (334) and two rotating protrusions (331) provided on the main body (334); the bracket (310) includes two support arms (311). One of the two support arms (311) is provided with a first through hole (3111), and the other is provided with an opening groove (3112). One of the two rotating protrusions (331) is inserted into the first through hole (3111), and the other is inserted into the opening groove (3112); or, both support arms (311) are provided with a second through hole (3113), and the two rotating protrusions (331) are arranged in a one-to-one correspondence with the two second through holes (3113). The rotating protrusions (331) are inserted into the corresponding second through holes (3113).

9. The circuit breaker according to claim 1, characterized in that, The armature (330) is provided with a first hook part (332), the first adjusting member (400) is provided with a second hook part (401), one of the two hooks of the spring (340) is hooked to the first hook part (332), and the other is hooked to the second hook part (401).

10. The circuit breaker according to any one of claims 1-9, characterized in that, The circuit breaker also includes a conductive bar (700) disposed within the housing (100), the conductive bar (700) including a first plate portion (710), the first plate portion (710) being perpendicular to the depth direction of the housing (100), and the magnetic yoke (320) being sandwiched between the bracket (310) and the first plate portion (710).

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