A circuit breaker tripping structure

Abstract

The utility model discloses a circuit breaker tripping structure, including a traction rod and a lock catch, wherein a hook for connecting with the lock catch is formed radially on the traction rod; an overload trigger device and a short circuit trigger device for driving the traction rod to rotate are also provided, and the hook is disengaged from the lock catch during the rotation of the traction rod. The utility model is based on the tripping mode of the traction rod in cooperation with the lock catch, and combines the overload trigger device and the short circuit trigger device to jointly trigger the tripping of the traction rod, so that the circuit breaker has both overload and short circuit tripping protection functions under a single tripping action structure, effectively reducing the complexity of the structure and the space occupied, and increasing the rationality and safety of the circuit breaker product function; further, the overload tripping and short circuit tripping have the ability to adjust the tripping current, making its application scenarios more comprehensive and applicable.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breakers and relates to a circuit breaker tripping structure. Background Art

[0002] A circuit breaker is a switching device that can close, carry and disconnect currents under normal circuit conditions and can close, carry and disconnect currents under abnormal circuit conditions within a specified time. It is usually equipped with a tripping structure inside, which can quickly trip when overload or short circuit occurs in the circuit breaker circuit to ensure the safety of the circuit.

[0003] The tripping structure in the existing circuit breaker products corresponds to a single tripping situation, and the design of a single tripping structure often only corresponds to one of the following: overload, short circuit, etc. If it is required to comprehensively deal with various abnormal situations that may occur in the circuit breaker, it is necessary to integrate the tripping structures with multiple functions. However, there are still many problems that need to be solved in the current integrated design, including the complex structure of the existing integrated products, multiple tripping structures occupying too much installation space, and the complex connection relationship between the components of the structure will abnormally affect the speed and effect of the tripping, etc. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a circuit breaker tripping structure.

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

[0006] A circuit breaker tripping structure comprises a traction rod and a lock catch, wherein a hook for connecting with the lock catch is formed radially on the traction rod; an overload trigger device and a short-circuit trigger device for driving the traction rod to rotate are also provided, and during the rotation of the traction rod, the hook is disengaged from the lock catch; the overload trigger device comprises a bimetallic strip and a movable part connected to one end of the bimetallic strip, a top rod facing the movable part is formed radially on the traction rod, and when the circuit breaker is overloaded, the bimetallic strip is deformed to drive the movable part to abut against the top rod; the short-circuit trigger device comprises a support member fixedly arranged in a housing, and a trigger member movably connected to the support member, the trigger member abuts against the outer periphery of the traction rod, and when the circuit breaker is short-circuited, the trigger member moves to drive the traction rod to rotate.

[0007] Furthermore, it also includes a shell, a core shaft is arranged in the shell, and the traction rod is sleeved on the core shaft.

[0008] Furthermore, an axial adjustment structure is provided for driving the traction rod to move axially along the core shaft, the movable part is provided with an inclined surface, the inclined surface faces the push rod, the axial adjustment structure includes a first knob and a slide groove, the slide groove is provided on the traction rod, the slide groove is provided perpendicular to the axial direction of the traction rod, the first knob is a cylindrical structure, an eccentric shaft is provided on the outer periphery of the first knob, the eccentric shaft is passed through the slide groove, and the eccentric shaft abuts against the side wall of the slide groove when the first knob is rotated.

[0009] Furthermore, the trigger member is an armature, one end of which is hinged to the support member, and a second protrusion is radially extended on the outer periphery of the traction rod. The short-circuit trigger device also includes a yoke, and when the circuit breaker is short-circuited, the yoke generates a magnetic field that attracts the armature to rotate, and the second protrusion is located between the armature and the yoke.

[0010] Furthermore, the short-circuit trigger device also includes an adjusting rod, a tension spring, a block and a second knob for fixing the circumferential position of the adjusting rod, a limiting rod is provided on the support member for abutting against a side of the armature facing away from the second protrusion, the block is hinged to the support member, one end of the block abuts against a side of the armature facing away from the limiting rod, a hook is radially provided on the outer periphery of the adjusting rod, and the two ends of the tension spring are respectively connected to the other end of the block and the hook; a bracket is provided in the shell, the adjusting rod is axially inserted into the bracket, and the adjusting rod abuts against the second knob in the circumferential direction.

[0011] Furthermore, the second knob is cylindrical in structure, a spiral surface is circumferentially provided at the bottom of the second knob, the spiral surface forms a certain length along the axial direction of the second knob, a lever is radially extended on the adjustment rod, and the end of the lever abuts against the spiral surface.

[0012] Furthermore, the trigger member is a pull rod, and the short-circuit trigger device also includes a moving iron core, a static iron core and a top spring. The static iron core is fixedly connected to the support member, and the two ends of the top spring are respectively connected to the moving iron core and the static iron core. When the circuit breaker is short-circuited, the static iron core generates a magnetic field for attracting the moving iron core to move, and the pull rod is connected to the moving iron core. A third protrusion is radially extended on the traction rod, and a through hole is opened on the pull rod for the third protrusion to pass through.

[0013] Furthermore, it also includes a sleeve sleeved outside the static iron core, and the sleeve is sleeved with a coil for strengthening the magnetic field generated by the static iron core.

[0014] Furthermore, one end of the lock is hinged to the shell and also includes a spring, both ends of the spring are respectively connected to the lock and the shell, and the spring provides elastic force to the lock to move away from the hook.

[0015] In summary, the utility model is beneficial in that:

[0016] The utility model is based on the tripping mode of the traction rod and the lock, and combines the overload trigger device and the short-circuit trigger device to jointly trigger the tripping of the traction rod, so that the circuit breaker has the tripping protection functions of overload and short circuit under the single tripping action structure, effectively reducing the complexity of the structure and the space occupied, and increasing the rationality and safety of the circuit breaker product function; further, the overload tripping and the short-circuit tripping have the adjustable tripping current, so that the application scenarios are more comprehensive and applicable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the tripping structure of the utility model.

[0018] Figure 2 for Figure 1 Schematic diagram of the structure from another perspective.

[0019] Figure 3 It is a schematic diagram of the structure of the traction rod and the locking part.

[0020] Figure 4 It is a structural schematic diagram of the overload trigger device.

[0021] Figure 5 It is a schematic diagram of the structure of the traction rod axial adjustment device in the overload trigger device.

[0022] Figure 6 Schematic diagram of the internal structure of the shell in some embodiments.

[0023] Figure 7 for Figure 6 Schematic diagram of the structure of the short-circuit trigger device.

[0024] Figure 8 for Figure 7 Schematic diagram of the structure from another perspective.

[0025] Fig. 9 for Figure 6 Schematic diagram of the cross-section structure in.

[0026] Fig.10 for Figure 6 Schematic diagram of the structure of the middle adjustment rod and the second knob part.

[0027] Fig.11 Schematic diagram of the internal structure of the shell in some other embodiments.

[0028] Fig.12 for Fig.11 Schematic diagram of the structure of the short-circuit trigger device.

[0029] Fig.13 for Fig.12 Schematic diagram of the cross-section structure in.

[0030] Markings in the figure: 1, housing; 11, rod body; 111, mandrel; 112, hook; 113, first protrusion; 1131, push rod; 114, slide groove; 115, third protrusion; 116, second protrusion; 12, lock; 121, hook; 122, spring; 13, support member; 2, overload trigger device; 21, bimetallic strip; 22, movable member; 221, inclined plane; 3, short-circuit trigger device; 312, pull rod; 3121, through hole; 313, moving iron core; 314, stationary iron core; 315, sleeve; 316, coil; 321, yoke; 322, armature; 323, stopper; 324, tension spring; 325, adjustment rod; 3251, hook; 3252, lever; 326, limit rod; 4, bracket; 41, first knob; 411, eccentric shaft; 42, second knob; 421, helical surface. DETAILED DESCRIPTION

[0031] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0032] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0033] All directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, horizontal, vertical...) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0034] Due to installation errors and other reasons, the parallel relationship referred to in the embodiments of the present invention may actually be an approximately parallel relationship, and the vertical relationship may actually be an approximately vertical relationship.

[0035] The utility model provides a circuit breaker tripping structure, which can be arranged in a thermal magnetic module or a leakage module in the circuit breaker. When a risk situation such as a short circuit or an overload occurs, the tripping action is triggered in time to disconnect the circuit in the circuit breaker to achieve short circuit protection or overload protection.

[0036] Reference Figure 1 and Figure 2 The adjustable tripping structure includes a housing 1, a traction rod, a lock 12, an overload trigger device 2 and a short circuit trigger device 3 arranged on the housing 1.

[0037] Reference Figure 3 As shown, the traction rod includes a rod body 11, the rod body 11 is passed through a core shaft 111, and the two ends of the core shaft 111 are fixedly connected to the housing 1. A hook 112 is arranged on the outer periphery of the rod body 11, and the hook 112 extends along the radial direction of the rod body 11. One end of the lock buckle 12 is hinged to the housing 1, and the other end is provided with a hook portion 121 for cooperating with the hook 112, and a spring 122 is also provided. The two ends of the spring 122 are respectively connected to the hook portion 121 and the housing 1, and the spring 122 is provided to the The lock buckle 12 forms an elastic force for driving the tripping action; when the lock buckle 12 is rotated to make the hook 112 and the hook portion 121 cooperate, the hook 112 and the hook portion 121 can form an interactive pulling force to counteract the elastic force of the spring 122 and maintain the positional relationship between the hook 112 and the lock buckle 12; when the rod body 11 drives the hook 112 to rotate, the hook 112 will be disengaged from the lock buckle 12, and then the lock buckle 12 will be further away from the hook 112 under the action of the spring 122 to complete the tripping action.

[0038] Reference Figure 4 The overload trigger device 2 includes a bimetallic strip 21 arranged in the housing 1, a movable part 22 is arranged on the top of the bimetallic strip 21, a first protrusion 113 is radially arranged on the outer periphery of the rod body 11, and a top rod 1131 facing the movable part 22 is arranged at the end of the first protrusion 113. When an overload occurs in the circuit breaker, the bimetallic strip 21 is deformed by the temperature change, so that the movable part 22 moves toward the top rod 1131 and resists against it. Under the push of the movable part 22, the rod body 11 rotates, thereby driving the hook 112 to disengage from the lock buckle 12, completing the tripping action.

[0039] Furthermore, in order to adjust the overload current that triggers the tripping, an axial adjustment structure for adjusting the axial position of the rod body 11 is also provided in this embodiment. Figure 5 The rod body 11 can move axially relative to the core shaft 111, and the axial adjustment structure includes a bracket 4, a first knob 41 and a slide groove 114, the slide groove 114 is arranged on the outer periphery of the rod body 11, and the opening direction of the slide groove 114 is perpendicular to the axial direction of the rod body 11, the bracket 4 is fixedly arranged on the shell 1, the first knob 41 is arranged on the bracket 4, the first knob 41 is a cylindrical structure, and can rotate around its own axis, an eccentric shaft 411 is arranged on the outer peripheral side of the first knob 41, the axis of the eccentric shaft 411 is parallel to the axis of the first knob 41 and is at a set interval, the eccentric shaft 411 extends downward into the slide groove 114, and the eccentric shaft 411 is driven to move by rotating the first knob 41, so that the eccentric shaft 411 abuts against the inner wall of the slide groove 114, thereby pushing the rod body 11 to move axially and adjust to the desired set position.

[0040] Correspondingly, the movable part 22 is provided with an inclined surface 221, and the inclined surface 211 can also be connected with the plane. The inclined surface 221 faces the top rod 1131, so that it forms a certain undulation in the direction toward the top rod 1131. Then, when the rod body 11 moves in the axial direction, the distance between the top rod 1131 and the inclined surface 221 also changes accordingly, changing the deformation amount required to trigger the tripping, thereby achieving the effect of adjusting the size of the overload current.

[0041] In some embodiments, a support member 13 is fixedly disposed in the housing 1 for fixing and installing the short-circuit trigger device 3. Figure 6 , 7 , 8, 9, the short-circuit trigger device 3 includes an armature 322, the lower end of the armature 322 is hinged to the support member 13, so that the armature 322 can rotate within a certain range around the hinge axis, and a limit rod 326 is provided on the support member 13, and the limit rod 326 abuts against the armature 322 on one side of the rotation direction of the armature 322 to limit the rotation of the armature 322 to that side. In the initial state or the circuit breaker closing state, the armature 322 remains against the limit rod 326.

[0042] A conductive part and a yoke 321 are provided on the side of the armature 322 away from the limit rod 326. When a large current passes through the circuit breaker and a short circuit occurs, the conductive part and the yoke 321 generate a magnetic field to attract the armature 322, causing the armature 322 to rotate. A second protrusion 116 is provided on the outer periphery of the rod body 11. The second protrusion 116 extends along the radial direction of the rod body 11 and is located on the side of the armature 322 away from the limit rod 326. When the armature 322 is attracted by the magnetic field and rotates, the armature 322 will abut against the second protrusion 116 and push it, thereby driving the rod body 11 to rotate so that the hook 112 is disengaged from the lock buckle 12, completing the tripping action.

[0043] Furthermore, in order to adjust the magnitude of the short-circuit current that triggers the tripping, a short-circuit current adjustment structure is further provided in the present embodiment, including an adjustment rod 325, a second knob 42, a tension spring 324 and a block 323, the middle portion of the block 323 being hinged to the support member 13, one end of the block 323 being against a side of the armature 322 that is away from the limiting rod 326, so that the armature 322 is pressed against the limiting rod 326; the adjustment rod 325 is provided on the bracket 4, the adjustment rod 325 can rotate around its own axis, a hook 3251 is radially extended on the adjustment rod 325, the two ends of the tension spring 324 are respectively connected to the other end of the block 323 and the hook 3251, the hook 3251 pulls the tension spring 324, so that the tension spring 324 pulls one end of the block 323, and then the block 323 is kept against the armature 322 with a set force.

[0044] The second knob 42 is disposed on the bracket 4 and is used to limit and adjust the angular position of the adjustment rod 325. Fig.10 The second knob 42 is cylindrical in structure and can rotate along its own axis. A spiral surface 421 with a certain length in its axial direction is circumferentially provided at the bottom of the second knob 42. A lever 3252 is radially extended from the outer periphery of the adjustment rod 325. The end of the lever 3252 forms a spherical surface to abut against the spiral surface 421. One end of the adjustment rod 325 is subjected to the continuous tension formed by the tension spring 324, and the other end is limited by the abutment between the lever 3252 and the spiral surface 421, so that the adjustment rod 325 is limited to a set angle position.

[0045] When the second knob 42 is rotated, the spiral surface 421 rotates to generate further axial pressure on the lever 3252, thereby driving the adjustment rod 325 to rotate, causing the hook 3251 to rotate and increase the pulling force on the tension spring 324. At this time, the pulling force on the block 323 increases, and the pressure applied by the block 323 to the armature 322 increases, thereby increasing the magnetic field strength required to trigger the armature 322 to resist the action of the block 323 and trigger the tripping, that is, increasing the short-circuit current for triggering the tripping; according to the same principle as above, the second knob 42 is rotated in the opposite direction to reduce the short-circuit current for triggering the tripping.

[0046] In some other embodiments, the short-circuit trigger device 3 may also include other forms, for example, Fig.11 , 12 , 13, a support member 13 is fixedly provided in the shell 1 for fixing the short-circuit trigger device 3, the short-circuit trigger device 3 includes a sleeve 315, the sleeve 315 is fixedly connected to the support member 13, a moving iron core 313 and a static iron core 314 are axially penetrated in the sleeve 315, wherein the static iron core 314 is located below the moving iron core 313, and the bottom of the static iron core 314 is fixedly connected to the support member 13, a top spring is provided between the moving iron core 313 and the static iron core 314, and the top spring maintains the moving iron core 313 and the static iron core 314 at a set distance.

[0047] A pull rod 312 is fixedly mounted on the top of the moving iron core 313 , and a through hole 3121 is provided in the middle of the pull rod 312 . The movement of the moving iron core 313 synchronously drives the lifting and lowering of the pull rod 312 .

[0048] A third protrusion 115 is disposed on the outer circumference of the rod body 11 . The third protrusion 115 extends in the radial direction of the rod body 11 and is used to pass through the through hole 3121 of the pull rod 312 .

[0049] When a large current passes through the coil 316 in the circuit breaker and causes a short circuit, the static iron core 314 generates a magnetic field sufficient to attract the moving iron core 313 to move downward. When the pull rod 312 moves downward under the action of the moving iron core 313, the pull rod 312 contacts the third protrusion 115 and drives it downward, driving the rotation of the rod body 11, thereby causing the hook 112 to rotate and disengage from the hook 121. At this time, the lock buckle 12 moves away from the hook 112 under the action of the spring 122, completing the tripping action.

[0050] Furthermore, a coil 316 is sleeved outside the sleeve 315 to enhance the magnetic field strength generated by the static iron core 314 .

[0051] Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

Claims

1. A circuit breaker tripping structure, characterized in that: The invention comprises a traction rod and a lock buckle (12), wherein a hook (112) for connecting with the lock buckle (12) is formed radially on the traction rod; an overload trigger device (2) and a short circuit trigger device (3) for driving the traction rod to rotate are also provided, wherein during the rotation of the traction rod, the hook (112) is disengaged from the lock buckle (12); the overload trigger device (2) comprises a bimetallic strip (21) and a movable part (22) connected to one end of the bimetallic strip (21); A push rod (1131) is formed radially on the guide rod and faces the movable part (22); when the circuit breaker is overloaded, the bimetallic strip (21) deforms to drive the movable part (22) to abut against the push rod (1131); the short-circuit trigger device (3) comprises a support member (13) fixedly arranged in the housing (1), and a trigger member movably connected to the support member (13); the trigger member abuts against the outer periphery of the traction rod; when the circuit breaker is short-circuited, the trigger member moves to drive the traction rod to rotate.

2. A circuit breaker tripping structure according to claim 1, characterized in that: It also comprises a shell (1), a core shaft (111) is arranged in the shell (1), and the traction rod is sleeved on the core shaft (111).

3. A circuit breaker tripping structure according to claim 2, characterized in that: An axial adjustment structure for driving the traction rod to move axially along the core shaft (111) is also provided. The movable part (22) is provided with an inclined surface (221), and the inclined surface (221) faces the push rod (1131). The axial adjustment structure comprises a first knob (41) and a slide groove (114). The slide groove (114) is provided on the traction rod, and the slide groove (114) is perpendicular to the axial direction of the traction rod. The first knob (41) is a cylindrical structure. An eccentric shaft (411) is provided on the outer periphery of the first knob (41), and the eccentric shaft (411) is inserted into the slide groove (114). When the first knob (41) rotates, the eccentric shaft (411) abuts against the side wall of the slide groove (114).

4. A circuit breaker tripping structure according to claim 1, characterized in that: The trigger member is an armature (322), one end of which is hinged to the support member (13), the outer periphery of the traction rod is provided with a second protrusion (116) extending radially, the short-circuit trigger device (3) also includes a yoke (321), when the circuit breaker is short-circuited, the yoke (321) generates a magnetic field that attracts the armature (322) to rotate, and the second protrusion (116) is located between the armature (322) and the yoke (321).

5. A circuit breaker tripping structure according to claim 4, characterized in that: The short-circuit trigger device (3) further comprises an adjusting rod (325), a tension spring (324), a stopper (323) and a second knob (42) for fixing the circumferential position of the adjusting rod (325); the support member (13) is provided with a limit rod (326) for abutting against a side of the armature (322) away from the second protrusion (116); the stopper (323) is hinged to the support member (13); one end of the stopper (323) is connected to the armature; The side of the iron (322) facing away from the limit rod (326) is abutted against, the outer circumference of the adjustment rod (325) is radially provided with a hook (3251), and the two ends of the tension spring (324) are respectively connected to the other end of the stopper (323) and the hook (3251); a bracket (4) is provided in the shell (1), the adjustment rod (325) is axially penetrated in the bracket (4), and the adjustment rod (325) is abutted against the second knob (42) in the circumferential direction.

6. A circuit breaker tripping structure according to claim 5, characterized in that: The second knob (42) is of cylindrical structure, and a spiral surface (421) is provided at the bottom of the second knob (42) along the circumferential direction, and the spiral surface (421) forms a certain length along the axial direction of the second knob (42). A lever (3252) is provided on the adjustment rod (325) along the radial direction, and the end of the lever (3252) abuts against the spiral surface (421).

7. A circuit breaker tripping structure according to claim 1, characterized in that: The trigger member is a pull rod (312), and the short-circuit trigger device (3) also includes a moving iron core (313), a static iron core (314) and a top spring. The static iron core (314) is fixedly connected to the support member (13), and the two ends of the top spring are respectively connected to the moving iron core (313) and the static iron core (314). When the circuit breaker is short-circuited, the static iron core (314) generates a magnetic field for attracting the moving iron core (313) to move. The pull rod (312) is connected to the moving iron core (313), and a third protrusion (115) is radially extended on the traction rod. A through hole (3121) for the third protrusion (115) to pass through is opened on the pull rod (312).

8. A circuit breaker tripping structure according to claim 7, characterized in that: It also includes a sleeve (315) sleeved outside the static iron core (314), and a coil (316) for strengthening the magnetic field generated by the static iron core (314) is sleeved on the sleeve (315).

9. A circuit breaker tripping structure according to claim 2, characterized in that: One end of the lock buckle (12) is hinged to the shell (1), and further comprises a spring (122), the two ends of the spring (122) being respectively connected to the lock buckle (12) and the shell (1), and the spring (122) providing elastic force to the lock buckle (12) to move away from the hook (112).

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