Search

CN-115799013-B - Tripping mechanism of circuit breaker and circuit breaker

CN115799013BCN 115799013 BCN115799013 BCN 115799013BCN-115799013-B

Abstract

The invention relates to the technical field of circuit breakers, in particular to a tripping mechanism of a circuit breaker and the circuit breaker, wherein the circuit breaker comprises a strip-shaped shell, and the tripping mechanism of the circuit breaker is arranged in a handle operation assembly, an electric driving structure, a first transmission assembly, a deflector rod, an instantaneous protection assembly and a switching-on/off assembly in the strip-shaped shell; the switching-on/off assembly is provided with a switching-on state and a switching-off state, a lock catch of the switching-on assembly is in a locking state in the switching-on state, the lock catch of the switching-off assembly is in an unlocking state in the switching-off state, the handle operation assembly is connected with the switching-on/off assembly through the second transmission assembly, the electric driving structure is connected with the switching-on/off assembly through the first transmission assembly, the deflector rod is rotatably connected with the strip-shaped shell, the deflector rod is positioned in a transmission track of the first transmission assembly, the deflector rod is triggered to rotate when the first transmission assembly transmits, and the instantaneous protection assembly is provided with a driving rod positioned between the deflector rod and the lock catch. The technical problem that in a strip-shaped circuit breaker, the lock catch is difficult to control in a long distance or the control precision is low is solved.

Inventors

  • ZHANG YANYANG
  • ZHAO MING
  • ZHAO ZHISHENG
  • YANG FAN
  • REN CHANGBIN

Assignees

  • 浙江天正电气股份有限公司

Dates

Publication Date
20260512
Application Date
20230109

Claims (9)

  1. 1. The tripping mechanism of the circuit breaker comprises a strip-shaped shell (1) and is characterized by comprising a handle operation assembly, an electric driving structure, a first transmission assembly, a deflector rod (4), an instantaneous protection assembly (2) and a switching-on/off assembly which are arranged in the strip-shaped shell (1); The opening and closing assembly is provided with a closing state and a separating and closing state, the lock catch (3) of the opening and closing assembly is in a locking state in the closing state, and the lock catch (3) of the opening and closing assembly is in an unlocking state in the separating and closing state; The handle operation assembly is connected with the opening and closing assembly through a second transmission assembly and is used for realizing manual opening or closing operation; The electric driving structure is connected with the opening and closing assembly through the first transmission assembly, and the first transmission assembly is driven by the electric driving structure along a first direction to drive the opening and closing assembly to be closed so as to realize electric closing operation; the deflector rod (4) is rotatably connected with the strip-shaped shell (1), the deflector rod (4) is positioned in a transmission track of the first transmission assembly, and the deflector rod (4) is triggered to rotate when the first transmission assembly is transmitted along the second direction; The instantaneous protection assembly (2) is provided with a driving rod positioned between the deflector rod (4) and the lock catch (3), and the lock catch (3) is pushed to unlock under the rotation of the deflector rod (4) so as to realize the electric brake-separating operation; And a limiting piece (9) used for limiting the deflector rod (4) is arranged on one side, away from the lock catch (3), of the deflector rod (4) in the strip-shaped shell (1).
  2. 2. The tripping mechanism of a circuit breaker according to claim 1, wherein the instantaneous protection assembly (2) comprises a movable iron core (201), a reset spring (202) and a mounting seat (203), the mounting seat (203) is fixedly connected with the strip-shaped shell (1), the movable iron core (201) is slidably arranged in the mounting seat (203), one end of the movable iron core (201) extends out of one end of the mounting seat (203) and abuts against one end of the deflector rod (4) far away from the first transmission assembly, the other end of the movable iron core is integrally connected with the driving rod, the driving rod extends out of the other end of the mounting seat (203) to push the lock catch (3) to unlock, a limit flange (205) is arranged on the periphery of the movable iron core (201), the reset spring (202) is sleeved on the movable iron core (201), one end of the reset spring (202) abuts against one end of the mounting seat (203) close to the lock catch (3), the other end of the reset spring abuts against the limit flange (205), and a coil (206) is arranged on the outer side of the movable iron core (203).
  3. 3. The tripping mechanism of the circuit breaker according to claim 1, wherein the instantaneous protection assembly (2) comprises a movable iron core (201), a reset spring (202) and a mounting seat (203), the mounting seat (203) is fixedly connected with the strip-shaped shell (1), the movable iron core (201) is arranged in the mounting seat (203) in a sliding mode, one end, close to the lock catch, of the movable iron core (201) extends out of the mounting seat (203) to push the lock catch (3) to unlock, a limiting flange (205) is arranged on the periphery of the movable iron core (201), the reset spring (202) is sleeved on the movable iron core (201), one end of the reset spring (202) is abutted with one end, close to the lock catch (3), of the mounting seat (203), the other end of the reset spring is abutted with the limiting flange (205), and a coil group (206) is sleeved on the outer side of the mounting seat (203) corresponding to the movable iron core (201); the driving rod is arranged in the movable iron core in a penetrating mode and is in sliding connection with the movable iron core, one end of the driving rod extends out of one end of the mounting seat (203) and is in butt joint with one end, away from the first transmission assembly, of the deflector rod (4), and the other end of the driving rod extends out of the other end of the mounting seat (203) to push the lock catch (3) to unlock.
  4. 4. A tripping mechanism of a circuit breaker according to any one of claims 1-3, characterized in that the first transmission assembly comprises a reduction gear assembly (7) and a first sector gear (8) which are distributed along the length direction of the strip-shaped shell (1), the electric driving structure is in driving connection with the reduction gear assembly (7), the reduction gear assembly (7) is in meshed connection with the first sector gear (8), the deflector rod (4) is positioned in the transmission track of the reduction gear assembly (7), the reduction gear assembly (7) triggers the deflector rod (4) to rotate when being transmitted along the second direction, the first sector gear (8) is connected with the lock catch, and the first sector gear (8) drives the lock catch (3) to lock along the transmission of the first direction, so that the electric closing operation is realized.
  5. 5. Trip mechanism of a circuit breaker according to claim 4, characterized in that said electric drive structure comprises a drive motor (5); The speed reduction gear assembly (7) comprises a gear set (701) and a toggle gear (702) which are distributed along the length direction of the strip-shaped shell (1); the driving motor (5) is meshed with the gear set (701) through a worm (6), and the gear set (701) is meshed with the toggle gear (702); one end of the poking gear (702) is provided with a poking block (703) in an outward protruding mode, and the poking block (703) rotates along with the poking gear (702) and can be abutted with one end of the poking rod (4) to drive the poking rod (4) to rotate; the one end that stir gear (702) kept away from stir piece (703) is provided with second sector gear (704) coaxial, first sector gear (8) with second sector gear (704) meshing.
  6. 6. The trip mechanism of a circuit breaker of claim 5 wherein said handle operating assembly includes a handle (16) and a first link (14); The second transmission assembly comprises a rotating piece (19), the rotating piece (19) is rotationally connected with the strip-shaped shell (1), and the rotating piece (19) is connected with the lock catch (3); One end of the first connecting piece (14) is connected with the handle (16), the other end of the first connecting piece is in rotary connection with the rotating piece (19) away from the axis, and the handle (16) can drive the rotating piece (19) to rotate so as to drive the lock catch (3) to lock or unlock.
  7. 7. Trip mechanism of a circuit breaker according to claim 6, characterized in that said rotating member (19) is coaxially connected to said first sector gear (8), said rotating member (19) being connected to said shackle (3) by means of a second connecting member (15); one end of the second connecting piece (15) is rotationally connected with the rotating piece (19) far away from the axis, and the other end of the second connecting piece is rotationally connected with one end of the lock catch (3) far away from the driving rod, so that the lock catch (3) is driven to be locked or unlocked.
  8. 8. The trip mechanism of a circuit breaker according to claim 5, characterized in that said toggle block (703) is circumferentially spaced from the center line of said second sector gear (704) by a preset angle.
  9. 9. A circuit breaker comprising a trip mechanism of the circuit breaker of any one of claims 1-8.

Description

Tripping mechanism of circuit breaker and circuit breaker Technical Field The invention relates to the technical field of circuit breakers, in particular to a tripping mechanism of a circuit breaker and the circuit breaker. Background A circuit breaker refers to a switching device capable of closing, carrying and opening a current under normal circuit conditions and closing, carrying and opening a current under abnormal circuit conditions within a prescribed time. The circuit breaker generally comprises a contact system, an arc extinguishing system, an operating mechanism, a protection device, a shell and the like, wherein the protection device mainly comprises a tripping mechanism, the opening or closing of the circuit breaker can be controlled, and when the circuit breaker is short-circuited or severely overloaded, the opening can be carried out through the tripping mechanism. The existing tripping mechanism drives the deflector rod to drive the lock catch to realize tripping through the reduction gear mechanism or to trip through the switch handle, so that manpower is saved, the lock catch is driven to be closed through the electric driving structure, however, in the strip-shaped circuit breaker, because the inner space of the circuit breaker is long and narrow, each structural member is distributed along the length direction of the circuit breaker, the arrangement distance is far, and the long-distance control or the control precision of the lock catch is low. Disclosure of Invention The invention provides a tripping mechanism of a circuit breaker and the circuit breaker, which solve the technical problems that in the strip-shaped circuit breaker, as the internal space of the circuit breaker is long and narrow, each structural member is distributed along the length direction of the circuit breaker, the arrangement distance is far, and the long-distance control of a lock catch is difficult or the control precision is low. In view of the above, a first aspect of the present invention provides a trip mechanism of a circuit breaker, the circuit breaker including a strip-shaped housing, the trip mechanism of the circuit breaker including a handle operation assembly, an electric driving structure, a first transmission assembly, a lever, a transient protection assembly, and a switching-on/off assembly disposed in the strip-shaped housing; The opening and closing assembly is provided with a closing state and a separating and closing state, the lock catch of the opening and closing assembly is in a locking state in the closing state, and the lock catch of the opening and closing assembly is in an unlocking state in the separating and closing state; The handle operation assembly is connected with the opening and closing assembly through a second transmission assembly and is used for realizing manual opening or closing operation; The electric driving structure is connected with the opening and closing assembly through the first transmission assembly, and the first transmission assembly is driven by the electric driving structure along a first direction to drive the opening and closing assembly to be closed so as to realize electric closing operation; The deflector rod is rotatably connected with the strip-shaped shell, the deflector rod is positioned in the transmission track of the first transmission assembly, and the deflector rod is triggered to rotate when the first transmission assembly is transmitted along the second direction; The instantaneous protection component is provided with a driving rod positioned between the deflector rod and the lock catch, and the lock catch is pushed to unlock under the rotation of the deflector rod so as to realize the electric brake-separating operation. The instantaneous protection assembly comprises an iron moving core, a reset spring and an installation seat, wherein the installation seat is fixedly connected with the strip-shaped shell, the iron moving core is arranged in the installation seat in a sliding mode, one end of the iron moving core extends out of one end of the installation seat and is in butt joint with one end of the deflector rod, which is far away from the first transmission assembly, the other end of the iron moving core is integrally connected with the driving rod, the driving rod extends out of the other end of the installation seat to push the lock catch to unlock, a limit flange is arranged on the periphery of the iron moving core, the reset spring is sleeved on the iron moving core, one end of the reset spring is in butt joint with one end, close to the lock catch, of the installation seat, the other end of the reset spring is in butt joint with the limit flange, and a coil group is sleeved on the outer side of the installation seat corresponding to the iron moving core. The instantaneous protection assembly comprises an instantaneous protection assembly, a movable iron core, a reset spring and a mounting seat, wherein the mounting seat is fixedly co