Circuit breaker

Abstract

The embodiment of the utility model provides a circuit breaker. The circuit breaker comprises a shell; the mounting shaft is arranged on the shell; the sensor is arranged on the shell and provided with a triggering part, and the sensor sends out alarm information when the triggering part is triggered; a first end of the bimetallic strip is connected with a heating element of the circuit breaker; the overload alarm rod is pivotally connected with the mounting shaft, the overload alarm rod can be pushed by the second end of the bimetallic strip so as to rotate from the initial position to the alarm position around the mounting shaft, the overload alarm rod triggers the trigger part when in the alarm position, and the overload alarm rod can axially move along the mounting shaft; the overload alarm rod rotates from an initial position to a first alarm stroke of an alarm position, and / or the second end of the bimetallic strip moves from an initial state to a second alarm stroke abutting against the overload alarm rod. According to the circuit breaker provided by the embodiment of the invention, the time delay characteristic of the overload alarm mechanism can be adjusted by adjusting the axial position of the overload alarm rod on the mounting shaft.

Description

Technical Field

[0001] The embodiments of this disclosure generally relate to the field of electrical equipment, and more specifically to a circuit breaker. Background Technology

[0002] Circuit breakers are commonly used safety protection devices in electrical circuits. Circuit breakers used in general applications include thermal tripping and magnetic tripping functions. When an overload or short circuit occurs, the tripping mechanism disconnects the current. In some special applications, such as those related to fire protection, chemical processing, and medical facilities, when an overload occurs, the circuit is generally not disconnected; instead, an overload alarm signal is output. When a short circuit occurs, the magnetic tripping mechanism immediately disconnects the circuit. Utility Model Content

[0003] This disclosure provides a circuit breaker, comprising: a housing; a mounting shaft disposed on the housing; a sensor disposed on the housing and having a triggering part, wherein the sensor emits an alarm message when the triggering part is triggered; a bimetallic strip, the first end of which is connected to a heating element of the circuit breaker; and an overload alarm lever pivotally connected to the mounting shaft, wherein the overload alarm lever can be pushed by the second end of the bimetallic strip to rotate from an initial position about the mounting shaft to an alarm position, the overload alarm lever triggers the triggering part when in the alarm position, and the overload alarm lever can be axially moved along the mounting shaft to adjust a first alarm stroke of the overload alarm lever rotating from the initial position to the alarm position and / or a second alarm stroke of the second end of the bimetallic strip from the initial state to abutting against the overload alarm lever.

[0004] In some embodiments, the overload alarm rod is provided with a first trigger surface, the overload alarm rod triggers the trigger part through the first trigger surface, and when the overload alarm rod moves axially along the mounting shaft, the distance between the first trigger surface and the trigger part gradually increases or decreases.

[0005] In some embodiments, a first trigger is provided at a position opposite to the sensor on the overload alarm rod, a first trigger surface is formed on the first trigger, and the first trigger is connected to the overload alarm rod by a first thermal adjustment screw so that the position of the first trigger can be adjusted in a direction perpendicular to the axial direction of the mounting shaft.

[0006] In some embodiments, one end of the overload alarm rod is provided with a mounting recess, the first trigger is engaged with the mounting recess in a non-rotatable manner, and the first trigger is provided with a T-slot, the head of the first heat-adjusting screw is inserted into the T-slot, and the threaded part of the first heat-adjusting screw is screwed to the wall of the mounting recess.

[0007] In some embodiments, the first trigger surface is beveled, and / or the first trigger member is formed with a boss portion that overlaps with the edge of the mounting recess.

[0008] In some embodiments, the overload alarm rod is provided with a second thermal adjustment screw, and the second end of the bimetallic strip is provided with a second trigger member. The second trigger member has a second trigger surface, which is used to abut against the second thermal adjustment screw to push the overload alarm rod to rotate from the initial position to the alarm position. The distance between the second thermal adjustment screw and the second trigger surface gradually increases or decreases as the overload alarm rod moves axially along the mounting axis.

[0009] In some embodiments, the second trigger surface is inclined, and / or the second end of the bimetallic strip is provided with a positioning hole, the second trigger member is provided with a slot, at least one side wall of the slot is provided with a positioning protrusion, the second end of the bimetallic strip is inserted into the slot, and the positioning protrusion engages with the positioning hole.

[0010] In some embodiments, the circuit breaker further includes a thermal adjustment knob that engages with an overload alarm lever to drive the overload alarm lever to move axially along the mounting shaft.

[0011] In some embodiments, the overload alarm rod is provided with a sliding groove, the extension direction of which is perpendicular to the axial direction of the mounting shaft, and the hot adjustment knob includes a central column and an eccentric column. The axis of the central column is perpendicular to the axis of the mounting shaft and serves as the rotation axis of the hot adjustment knob. The axis of the eccentric column is parallel to the axis of the central column and slides in conjunction with the sliding groove.

[0012] In some embodiments, the overload alarm rod includes a first main body and a plurality of first sleeves protruding relative to the first main body, the plurality of first sleeves being sleeved on a mounting shaft; the circuit breaker further includes a magnetic tripping mechanism, the magnetic tripping mechanism including a tripping rod, the tripping rod including a second main body and a plurality of second sleeves protruding relative to the second main body, the plurality of second sleeves being sleeved on a mounting shaft, the plurality of second sleeves being spaced apart from the plurality of first sleeves along the axial direction of the mounting shaft.

[0013] The circuit breaker provided in this embodiment adjusts the delay characteristics of the overload alarm mechanism by adjusting the axial position of the overload alarm rod on the mounting shaft, thereby adjusting the first alarm stroke of the overload alarm rod and / or the second alarm stroke of the bimetallic strip to meet the user's needs.

[0014] It should be understood that the content described in this section is not intended to limit the key or essential features of the embodiments of this disclosure, nor is it intended to restrict the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0015] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein:

[0016] Figure 1 A schematic diagram of the structure of a circuit breaker according to an embodiment of the present disclosure is shown;

[0017] Figure 2 It shows Figure 1 The diagram shown is an exploded view of the circuit breaker.

[0018] Figure 3 and Figure 4 It shows Figure 1 The diagram shows the overload alarm mechanism of the circuit breaker viewed from different angles.

[0019] Figure 5 It shows Figure 2 A schematic diagram of the overload alarm rod and the first trigger element in the diagram;

[0020] Figure 6 It shows Figure 5 An exploded view of the overload alarm lever and the first trigger element;

[0021] Figure 7 and Figure 8 It shows Figure 6 A schematic diagram of the structure of the first trigger element when viewed from different angles;

[0022] Figure 9 A schematic diagram of the structure of a circuit breaker according to another embodiment of the present disclosure is shown;

[0023] Figure 10 and Figure 11 It shows Figure 9 The diagram shows the structural schematics of the overload alarm mechanism of the circuit breaker viewed from different angles; and

[0024] Figure 12 and Figure 13 It shows Figure 11 The structural diagram of the second trigger element when viewed from different angles. Detailed Implementation

[0025] Preferred embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0026] The term "comprising" and its variations as used herein signify open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc., may refer to different or the same objects.

[0027] Figure 1 A schematic diagram of the structure of a circuit breaker 100 provided according to a disclosed embodiment is shown. Figure 2 An exploded view of circuit breaker 100 is shown. Figure 3 and Figure 4 The diagram shows the structure of the overload alarm mechanism 20 of the circuit breaker 100 as viewed from different angles. Figure 5 A schematic diagram of the overload alarm rod 23 and the first trigger 25 is shown. Figure 6 An exploded view of the overload alarm lever 23 and the first trigger 25 is shown. Figure 7 and Figure 8 The diagram shows the structure of the first trigger 25 when viewed from different angles.

[0028] See Figure 1 and Figure 2 The circuit breaker 100 includes a housing 10, on which heating elements 31 corresponding to each phase of the circuit breaker 100 are disposed. The circuit breaker 100 also includes an overload alarm mechanism 20 and a magnetic trip mechanism 40 mounted on the housing 10 and corresponding to each phase of the circuit breaker 100. In the event of a circuit current overload, the overload alarm mechanism 20 may issue an alarm signal but will not cause the operating mechanism (not shown) of the circuit breaker 100 to trip. In the event of a circuit current short circuit, the magnetic trip mechanism 40 actuates, causing the operating mechanism of the circuit breaker 100 to trip, thereby interrupting the current. This circuit breaker 100 is particularly suitable for fire-related systems, where the load may be a three-phase motor such as a smoke exhaust fan or fire pump. The circuit breaker 100 may be, but is not limited to, a molded case circuit breaker.

[0029] See also Figure 1 and Figure 2 In some embodiments, the overload alarm mechanism 20 may include a mounting shaft 21, a sensor 22, an overload alarm rod 23, a bimetallic strip 24, a first trigger 25, a first heat-adjusting screw 271, a heat-adjusting knob 28, and a resilient reset member 29. In some embodiments, the magnetic tripping mechanism 40 may include a tripping rod 41, a stationary magnet 42, a moving magnet 43, a magnetic adjustment rod 44, a resilient reset member 45, a magnetic adjustment knob 46, a tripping hammer 47, and a resilient reset member 48. Of course, in some alternative embodiments, the overload alarm mechanism 20 and the magnetic tripping mechanism 40 may have other suitable implementations.

[0030] In some embodiments, the housing 10 may include a base 11. The heating element 31, the overload alarm mechanism 20, and the magnetic tripping mechanism 40 may be disposed on the base 11 and may be enclosed by a cover (not shown).

[0031] The mounting shaft 21 of the overload alarm mechanism 20 can be directly or indirectly connected to the base 11 of the housing 10. In some embodiments, a bracket 12 can be mounted on the top of the base 11. In some embodiments, the bracket 12 is provided with a mounting hole 121, and the base 11 is correspondingly provided with a mounting hole 111. Fasteners (not shown) can pass through the mounting hole 121 and connect to the mounting hole 111, thereby fixing the bracket 12 to the base 11.

[0032] The sensor 22 can be mounted on the housing 10 via the bracket 12. Specifically, the bracket 12 is provided with a mounting groove 123, in which the sensor 22 can be disposed. The sensor 22 has a trigger part 221, which can be, but is not limited to, a trigger spring. When the trigger part 221 is triggered by the overload alarm lever 23, the sensor 22 can issue an alarm signal. The sensor 22 can be, but is not limited to, a microswitch. Of course, in some alternative embodiments, the sensor 22 can also be mounted on the housing 10 in other ways.

[0033] In some embodiments, the connection terminal 222 of the sensor 22 is exposed relative to the sensor 22 body. The plug 50 with wiring harness 51 has a socket, and the connection terminal 222 of the sensor 22 detachably engages with the socket of the plug 50. Thus, during the production of the circuit breaker 100, the probes of the thermal adjustment equipment can be easily connected to the connection terminal of the sensor 22 for thermal adjustment testing without having to connect the plug 50 to the sensor 22 for testing via the wiring harness 51. The plug 50 can be connected to the sensor 22 at the appropriate time, thereby preventing the wiring harness 51 from interfering with the normal operation of the production equipment due to entanglement with the production equipment during the production of the circuit breaker 100.

[0034] The overload alarm lever 23 is pivotally connected to the mounting shaft 21, allowing it to rotate around the shaft to switch between the initial position and the alarm position. In the initial position, the overload alarm lever 23 does not trigger the trigger part 221 of the sensor 22, and the sensor 22 does not issue an alarm signal. In the alarm position, the overload alarm lever 23 triggers the trigger part 221 of the sensor 22, and the sensor 22 issues an alarm signal. The rotation angle of the overload alarm lever 23 from the initial position to the alarm position can be called the first alarm stroke of the overload alarm lever 23. In embodiments where the sensor 22 uses a microswitch, when the overload alarm lever 23 rotates towards the alarm position, the portion of the overload alarm lever 23 corresponding to the trigger part 221 presses down on the trigger part 221. Once the trigger part 221 is pressed into place, the sensor 22 issues an alarm signal.

[0035] See Figures 3 to 6 In some embodiments, the overload alarm lever 23 may include a first body portion 231, a plurality of first sleeve portions 233 protruding relative to the first body portion 231, and a plurality of abutment portions 232 extending from the first body portion 231. The first body portion 231 may be a split structure or a one-piece structure. The plurality of first sleeve portions 233 are spaced apart along the axial direction of the mounting shaft 21, and each first sleeve portion 233 is sleeved on the mounting shaft 21 to allow the overload alarm lever 23 to rotate between an initial position and an alarm position, and to allow the overload alarm lever 23 to move axially along the mounting shaft 21. Each abutment portion 232 is, for example, a flat plate structure extending from the first body portion 231. In some embodiments, the position and number of abutment portions 232 correspond to the position and number of bimetallic strips 24, and each abutment portion 232 is used to withstand the torque applied by the corresponding bimetallic strip 24.

[0036] When the first main body 231 of the overload alarm rod 23 is a split structure, the first main body 231 may include two or more split parts connected sequentially along the axial direction of the mounting shaft 21. Each split part of the first main body 231 is relatively short, and each pair of adjacent split parts is fitted with a clearance. In this way, even if the first main body 231 undergoes partial or overall creep deformation, the multiple first sockets 233 located on different split parts can maintain good coaxiality, and the multiple first sockets 233 maintain a small frictional force with the mounting shaft 21, avoiding rotational jamming of the overload alarm rod 23.

[0037] See Figure 5 In some embodiments, the overload alarm rod 23 includes, for example, two separate parts: a first part 2311 and a second part 2312. The adjacent ends of the first part 2311 and the second part 2312 overlap, and the second part 2312 is provided with a groove 2313. The first part 2311 is provided with a locking block 2314, which engages with the groove 2313. Both the first part 2311 and the second part 2312 are provided with a first socket portion 233 and an abutment portion 232. When the mounting shaft 21 passes through each of the first socket portions 233 of the first part 2311 and the second part 2312, the first part 2311 and the second part 2312 can move together axially and circumferentially.

[0038] The first end 241 of the bimetallic strip 24 is fixed to the corresponding heating element 31, and the heat from the heating element 31 can be transferred to the bimetallic strip. The second end 242 of the bimetallic strip 24 extends toward the overload alarm lever 23. In the initial state, before being affected by the current heating effect, the second end 242 of the bimetallic strip 24 is not in contact with the overload alarm lever 23. When the circuit current is overloaded, the bimetallic strip bends due to the current heating effect. When the second end 242 of the bimetallic strip 24 bends to a certain extent, it abuts against the corresponding abutment part 232 of the overload alarm lever 23, thereby pushing the corresponding abutment part 232, causing the overload alarm lever 23 to rotate from the initial position to the alarm position. The distance that the second end 242 of the bimetallic strip 24 moves from the initial state to the point of contact with the overload alarm lever 23 (specifically, the abutment part 232) can be called the second alarm stroke. When the temperature of the bimetallic strip 24 drops and it no longer abuts against the contact portion 232 of the overload alarm rod 23, the overload alarm rod 23 can return to its initial position under the drive of the elastic reset member 29 and be held in the initial position.

[0039] See Figure 4 and Figure 5 In some embodiments, the elastic reset member 29 is, for example, a spring, with a first end connected to the bracket 12 and a second end connected to the fixing hook 236 on the overload alarm rod 23. In some alternative embodiments, the elastic reset member 29 may also have other implementations, as long as it can apply a torque to the overload alarm rod 23 to rotate it to its initial position.

[0040] The first trigger 25 is disposed at one end of the overload alarm lever 23, opposite to the sensor 22. The first trigger 25 has a first trigger surface 251, and the overload alarm lever 23 triggers the trigger part 221 by abutting the first trigger surface 251 against the trigger part 221. For example, when the overload alarm lever 23 rotates from the initial position to the alarm position, the first trigger surface 251 of the first trigger 25 gradually approaches the trigger part 221 of the sensor 22, and then presses the trigger part 221 into place, at which point the sensor 22 issues an alarm signal.

[0041] In some embodiments, the first trigger 25 is connected to the overload alarm rod 23 via a first thermal adjustment screw 271, the axis of which is perpendicular to the axis of the mounting shaft 21. During the production of the circuit breaker 100, when the overload alarm rod 23 is in its initial position in the circumferential direction, turning the first thermal adjustment screw 271 allows the first trigger 25 to move in a direction perpendicular to the axis of the mounting shaft 21, thereby adjusting the distance between the first trigger surface 251 of the first trigger 25 and the trigger portion 221 of the sensor 22. It is understood that as the distance between the first trigger surface 251 and the trigger portion 221 changes, the first alarm stroke of the overload alarm rod 23 is adjusted accordingly, and the delay characteristics of the overload alarm mechanism 20 are also adjusted accordingly. Therefore, during the production of the circuit breaker 100, the thermal adjustability of the overload alarm mechanism 20 can be easily achieved by turning the first thermal adjustment screw 271, which is beneficial for improving production efficiency. During the production process, after the position of the first trigger 25 is adjusted into place by the first heat adjustment screw 271, the relative positions of the first heat adjustment screw 271, the first trigger 25 and the overload alarm rod 23 can be fixed by sealant.

[0042] See Figure 3 The first trigger surface 251 is generally inclined, and it is tilted relative to the axial direction of the mounting shaft 21. When the overload alarm lever 23 moves axially along the mounting shaft 21, the distance between the first trigger surface 251 and the trigger part 221 gradually increases or decreases. As can be seen from the above, as the distance between the first trigger surface 251 and the trigger part 221 changes, the first alarm stroke of the overload alarm lever 23 is adjusted accordingly, and the delay characteristics of the overload alarm mechanism 20 are also adjusted accordingly.

[0043] See Figures 2 to 4 The axial position of the overload alarm lever 23 on the mounting shaft 21 can be adjusted by a heat-adjusting knob 28. In some embodiments, the heat-adjusting knob 28 is rotatably mounted in a hole 125 of the bracket 12. The heat-adjusting knob 28 may include a central post 281 and an eccentric post 282. The axis of the central post 281 is perpendicular to the axis of the mounting shaft 21, and the axis of the central post 281 serves as the rotation axis of the heat-adjusting knob 28. The axis of the eccentric post 282 is parallel to the axis of the central post 281. The overload alarm lever 23 is provided with a sliding groove 234, the extension direction of which is perpendicular to the axial direction of the mounting shaft 21, and the sliding groove 234 is slidably engaged with the eccentric post 282. That is, the heat-adjusting knob 28 engages with the overload alarm lever 23 via the eccentric post 282. When an external force turns the heat-adjusting knob 28, the heat-adjusting knob 28 drives the alarm lever 23 to move axially along the mounting shaft 21.

[0044] The overload alarm lever 23 can be adjusted on the mounting shaft 21 by using the thermal adjustment knob 28, thereby enabling the thermally adjustable (Ir position adjustable) operation of the overload alarm mechanism 20 to be performed at the user end. In some embodiments, multiple Ir positions can be marked on the bracket 12 along the circumference of the hole 125. Thus, after receiving the manufactured circuit breaker 100, the user can adjust the overload alarm lever 23 to a suitable axial position according to the markings to achieve the desired delay characteristics of the circuit breaker 100. Compared to circuit breakers 100 where the overload alarm mechanism 20 cannot be thermally adjusted, the circuit breaker 100 provided in this embodiment offers users a thermally adjustable overload alarm mechanism 20, meeting different user needs.

[0045] In some embodiments, one end of the overload alarm rod 23 is provided with a mounting recess 230, and the first trigger 25 is engaged with the mounting recess 230 in a non-rotatable manner. In this way, when the first thermal adjustment screw 271 is turned, the first trigger 25 can only move along the axial direction of the first thermal adjustment screw 271 and will not rotate around the axis of the first thermal adjustment screw 271, thus avoiding inaccurate positioning of the first trigger surface 251.

[0046] There are many ways to achieve a non-rotatable fit between the first trigger 25 and the mounting recess 230. See also Figures 5 to 7 In some embodiments, the side of the first trigger 25 contacts the sidewall of the mounting recess 230 via a planar contact. In some embodiments, the first trigger 25 is formed with a boss 252 that overlaps with the edge of the mounting recess 230. The boss 252 can restrict the rotation of the first trigger 25 relative to the axis of the first heat-adjusting screw 271 and enhance the structural strength of the first trigger 25.

[0047] See Figure 6 and Figure 8 In some embodiments, the first trigger 25 is provided with a T-slot 250. The head 2711 of the first heat-adjusting screw 271 engages in the T-slot 250, and the threaded shank 2712 of the first heat-adjusting screw 271 is screwed into the hole 2302 of the wall 2301 of the mounting recess 230. By turning the threaded shank 2712, the first trigger 25 moves together with the first heat-adjusting screw 271 in a direction perpendicular to the axial direction of the mounting shaft 21.

[0048] It should be noted that, although the above description takes the example of the first trigger surface 251 being set on the first trigger member 25 connected to the overload alarm rod 23, in some alternative embodiments, the first trigger surface 251 can be directly formed on the overload alarm rod 23.

[0049] See back Figure 1 and Figure 2The release lever 41 of the magnetic release mechanism 40 includes a second main body 411, a plurality of second sleeve portions 412 protruding relative to the second main body 411, a latch portion 413 extending from the second main body 411, and a plurality of force-bearing arms 415 extending from the second main body 411.

[0050] The second sleeve 412 is fitted onto the mounting shaft 21 to allow the trip lever 41 to rotate between the tripped position and the normal position. The trip lever 41 can be held in the normal position by an elastic reset member 48, which can be, but is not limited to, a torsion spring. Multiple second sleeves 412 and multiple first sleeves 233 are spaced apart axially along the mounting shaft 21 to avoid interference between the rotation of the trip lever 41 around the mounting shaft 21 and the rotation of the overload alarm lever 23 around the mounting shaft 21, which could cause false tripping or false alarms. The step of the latch 413 is used to engage with the hook 471 of the trip hammer 47, holding the trip hammer 47 in the locked position. When the trip hammer 47 is in the locked position, the operating mechanism is not tripped.

[0051] A stationary magnet 42 is fixed to the heating element 31. A movable magnet 43 is pivotally connected to a bracket 49 via a pivot 431, and the bracket 49 is fixed to the heating element 31. A magnetic adjustment rod 44 is rotatably mounted in a recess 122 of the bracket 12 about its own axis. Each movable magnet 43 is connected to the magnetic adjustment rod 44 via a corresponding elastic reset member 45. A magnetic adjustment knob 46 is rotatably mounted in a hole 126 of the bracket 12. The magnetic adjustment knob 46 abuts against the magnetic adjustment rod 44 via a helical surface. When an external force turns the magnetic adjustment knob 46, the magnetic adjustment knob 46 drives the magnetic adjustment rod 44 to rotate, thereby adjusting the tension of each elastic reset member 45, so that the magnetic tripping current can be adjusted, realizing the magnetically adjustable function of the magnetic tripping mechanism 40.

[0052] The trip hammer 47 slides into the groove 124 of the bracket 12. An elastic reset member (not shown) may be provided inside the groove 124. The elastic reset member is used to apply a force to the trip hammer 47 so that its disc-shaped head extends out of the groove 124.

[0053] When the circuit is short-circuited, the moving magnet 43 is attracted by the stationary magnet and rotates towards the force arm 415. The moving magnet 43 then applies torque to the trip lever 41 through the force arm 415, causing the trip lever 41 to rotate from its normal position to the tripped position. The step of the latch 413 no longer locks the trip hammer 47. Afterwards, the trip hammer 47 extends from the slide groove 124 under the action of an elastic reset member (not shown), and the disc-shaped head of the trip hammer 47 strikes the operating mechanism, causing the operating mechanism to trip and the current to be disconnected.

[0054] For circuit breakers with thermomagnetic tripping function, to ensure sufficient torque on the tripping rod during thermal (overload) tripping, the relative positions of the second ends of each bimetallic strip and the tripping rod need to be strictly adjusted so that each bimetallic strip simultaneously applies torque to the tripping rod during overload. In the overload alarm but non-tripping circuit breaker 100 provided in this embodiment, when the circuit is overloaded, each bimetallic strip 24 does not need to drive the tripping rod 41; only a torque needs to be applied to the overload alarm rod 23 to trigger the sensor (specifically, a microswitch). The overload alarm rod 23 can rotate to the alarm position with a small torque to trigger the trigger part 221 of the sensor 22. Even in extreme cases, as long as one bimetallic strip 24 pushes the overload alarm rod 23 to rotate, the trigger part 221 of the sensor 22 can be triggered. Therefore, the adjustment process of each bimetallic strip 24 during the production of the circuit breaker 100 can be simplified, significantly improving production efficiency. In addition, considering the difference in the initial position of each bimetallic strip 24, the difference in the second alarm stroke caused by the difference in the initial position of each bimetallic strip 24 can be compensated by adjusting the thermal adjustment range of each bimetallic strip 24, so that each bimetallic strip 24 can jointly apply torque to the overload alarm rod 23.

[0055] Figure 9 A schematic diagram of the structure of a circuit breaker 100 provided according to another disclosed embodiment is shown. Figure 10 and Figure 11 The diagram shows the structure of the overload alarm mechanism 20 of the circuit breaker 100 as viewed from different angles. Figure 12 and Figure 13 The diagram shows the structure of the second trigger 26 as viewed from different angles. This embodiment mainly modifies the structure of the overload alarm mechanism 20. Unless otherwise specified, the structure of the circuit breaker 100 can be referred to the description of the circuit breaker 100 above, and will not be repeated here.

[0056] Figure 10 and Figure 11 The overload alarm mechanism 20 shown omits the first trigger 25 and the first heat-adjusting screw 271 compared to the overload alarm mechanism 20 described above. Correspondingly, the mounting recess 230 for receiving the first trigger 25 is omitted from the overload alarm lever 23. In some embodiments, the overload alarm lever 23 has a plate formed corresponding to the position of the sensor 22, which can be integrally formed with a protrusion 235 extending from the first main body portion 231 of the overload alarm lever 23. When the overload alarm lever 23 rotates towards the alarm position, the plate triggers the trigger portion 221 of the sensor 22. Of course, the overload alarm lever 23 can also trigger the trigger portion 221 of the sensor 22 through other suitable structures.

[0057] In some embodiments, the overload alarm lever 23 includes a first main body portion 231, a plurality of first sleeve portions 233 protruding relative to the first main body portion 231, and a plurality of protrusions 235 extending from the first main body portion 231. The first main body portion 231 can be a split structure or a one-piece structure. When the first main body portion 231 adopts a split structure, the structure of the first main body portion 231 described above can be referred to. The plurality of first sleeve portions 233 are spaced apart along the axial direction of the mounting shaft 21, and each first sleeve portion 233 is sleeved on the mounting shaft 21 to allow the overload alarm lever 23 to rotate between an initial position and an alarm position, and to allow the overload alarm lever 23 to move axially along the mounting shaft 21.

[0058] Each protrusion 235 is provided with a second heat-adjusting screw 272, the number and position of which correspond to the number and position of the bimetallic strips 24. The second end 242 of the bimetallic strip 24 is provided with a second trigger 26, which has a second trigger surface 261. The bimetallic strip 24 pushes the overload alarm rod 23 by abutting the second trigger surface 261 against the second heat-adjusting screw 272, so that the overload alarm rod 23 rotates from the initial position to the alarm position.

[0059] See Figure 10 and Figure 12 The second trigger surface 261 is generally inclined, and it is tilted relative to the axial direction of the mounting shaft 21. When the overload alarm lever 23 moves axially along the mounting shaft 21, the distance between the second thermal adjustment screw 272 and the second trigger surface 261 gradually increases or decreases. As the distance between the second thermal adjustment screw 272 and the second trigger surface 261 changes, the second end of the bimetallic strip 24 adjusts from its initial state to the second alarm stroke abutting against the overload alarm lever 23, and the delay characteristics of the overload alarm mechanism 20 are also adjusted accordingly. Thus, after receiving the completed circuit breaker 100, the user can adjust the overload alarm lever 23 to a suitable axial position using the thermal adjustment knob 28 to achieve the desired delay characteristics of the circuit breaker 100.

[0060] In some embodiments, the second end 242 of the bimetallic strip 24 is provided with a positioning hole (not shown in the figure). See also Figure 13 The second trigger 26 is provided with a slot 260, and a positioning protrusion 262 is provided on the side wall of the slot 260. The second end 242 of the bimetallic strip 24 can be inserted into the slot 260, and the positioning protrusion 262 engages with the positioning hole on the second end 242 of the bimetallic strip 24, so that the second trigger 26 can be reliably positioned on the bimetallic strip 24.

[0061] The circuit breaker 100 provided in this embodiment adjusts the first alarm stroke of the overload alarm rod 23 and / or the second alarm stroke of the bimetallic strip 24 by adjusting the axial position of the overload alarm rod 23 on the mounting shaft 21, thereby adjusting the delay characteristics of the overload alarm mechanism 20 to meet the user's requirement that the circuit breaker 100 has magnetically adjustable and thermally adjustable functions.

[0062] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A circuit breaker (100), characterized in that, include: Shell (10); Mounting shaft (21) is disposed on the housing (10); A sensor (22) is disposed on the housing (10) and has a trigger part (221), which emits an alarm message when the trigger part (221) is triggered; A bimetallic strip (24), the first end (241) of which is connected to the heating element (31) of the circuit breaker (100); and The overload alarm rod (23) is pivotally connected to the mounting shaft (21), and The overload alarm lever (23) is practicable by the second end (242) of the bimetallic strip (24) to rotate from an initial position about the mounting shaft (21) to an alarm position, wherein the overload alarm lever (23) triggers the trigger (221) when in the alarm position, and The overload alarm rod (23) can move axially along the mounting shaft (21) to adjust the first alarm stroke of the overload alarm rod (23) from the initial position to the alarm position and / or the second end (242) of the bimetallic strip (24) from the initial state to the second alarm stroke that abuts against the overload alarm rod (23).

2. The circuit breaker (100) according to claim 1, characterized in that, The overload alarm rod (23) is provided with a first trigger surface (251), and the overload alarm rod (23) triggers the trigger part (221) through the first trigger surface (251). When the overload alarm rod (23) moves axially along the mounting shaft (21), the distance between the first trigger surface (251) and the trigger part (221) gradually increases or decreases.

3. The circuit breaker (100) according to claim 2, characterized in that, A first trigger (25) is provided at a position opposite to the sensor (22) on the overload alarm rod (23), and a first trigger surface (251) is formed on the first trigger (25). The first trigger (25) is connected to the overload alarm rod (23) via a first heat-adjusting screw (271) so that the position of the first trigger (25) can be adjusted in a direction perpendicular to the axial direction of the mounting shaft (21).

4. The circuit breaker (100) according to claim 3, characterized in that, One end of the overload alarm rod (23) is provided with a mounting recess (230), and the first trigger (25) is engaged with the mounting recess (230) in a non-rotatable manner. The first trigger (25) is provided with a T-slot (250), the head (2711) of the first heat-adjusting screw (271) is inserted into the T-slot (250), and the threaded rod (2712) of the first heat-adjusting screw (271) is screwed to the wall (2301) of the mounting recess (230).

5. The circuit breaker (100) according to claim 4, characterized in that, The first trigger surface (251) is inclined, and / or the first trigger member (25) is formed with a boss (252) that overlaps with the edge of the mounting recess (230).

6. The circuit breaker (100) according to claim 1, characterized in that, The overload alarm rod (23) is equipped with a second heat adjustment screw (272). The second end (242) of the bimetallic strip (24) is provided with a second trigger (26), the second trigger (26) having a second trigger surface (261), the second trigger surface (261) being used to abut against the second heat-adjusting screw (272) to push the overload alarm lever (23) to rotate from the initial position to the alarm position, and When the overload alarm rod (23) moves axially along the mounting shaft (21), the distance between the second heat adjustment screw (272) and the second trigger surface (261) gradually increases or decreases.

7. The circuit breaker (100) according to claim 6, characterized in that, The second trigger surface (261) is inclined, and / or The second end (242) of the bimetallic strip (24) is provided with a positioning hole, and the second trigger (26) is provided with a slot (260). At least one side wall of the slot (260) is provided with a positioning protrusion (262). The second end (242) of the bimetallic strip (24) is inserted into the slot (260), and the positioning protrusion (262) engages with the positioning hole.

8. The circuit breaker (100) according to any one of claims 1 to 7, characterized in that, The circuit breaker (100) also includes a heat adjustment knob (28) which engages with the overload alarm lever (23) to drive the overload alarm lever (23) to move axially along the mounting shaft (21).

9. The circuit breaker (100) according to claim 8, characterized in that, The overload alarm rod (23) is provided with a sliding groove (234), the sliding groove (234) extending perpendicular to the axial direction of the mounting shaft (21), and The heat adjustment knob (28) includes a central column (281) and an eccentric column (282). The axis of the central column (281) is perpendicular to the axis of the mounting shaft (21) and serves as the rotation axis of the heat adjustment knob (28). The axis of the eccentric column (282) is parallel to the axis of the central column (281) and slides with the sliding groove (234).

10. The circuit breaker (100) according to any one of claims 1 to 7, characterized in that, The overload alarm rod (23) includes a first main body (231) and a plurality of first sleeve portions (233) protruding relative to the first main body, the plurality of first sleeve portions (233) being sleeved on the mounting shaft (21); The circuit breaker (100) further includes a magnetic tripping mechanism (40), which includes a tripping rod (41). The tripping rod (41) includes a second main body (411) and a plurality of second sleeves (412) protruding relative to the second main body (411). The plurality of second sleeves (412) are sleeved on the mounting shaft (21). The plurality of second sockets (412) and the plurality of first sockets (233) are spaced apart along the axial direction of the mounting shaft (21).

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