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CN-115148555-B - Operating mechanism of circuit breaker

CN115148555BCN 115148555 BCN115148555 BCN 115148555BCN-115148555-B

Abstract

An operating mechanism of a circuit breaker belongs to the technical field of low-voltage electrical appliances. The brake release mechanism comprises a pair of side plates, a connecting rod assembly, a brake release lever and a brake release half shaft, wherein the brake release half shaft is in snap fit with the brake release lever, the brake release lever is in snap fit with the connecting rod assembly, the connecting rod assembly comprises a first connecting rod, a second connecting rod, a locking rod and a swinging rod, two ends of the first connecting rod are respectively hinged with the second connecting rod and the locking rod, the locking rod is arranged between the pair of side plates, the other end of the second connecting rod is hinged with the swinging rod, the swinging rod is fixed on a main shaft, and the brake release mechanism is characterized by further comprising a blocking device, wherein the blocking device comprises a blocking part positioned on any one of the locking rod and the brake release lever and a matching part positioned on the other one of the locking rod and the brake release lever, the brake release half shaft is unlocked in the brake release lever, and the locking rod pushes the brake release lever to rotate until the locking rod is unlocked, and then the blocking part collides with the matching part to prevent the brake release lever from continuously rotating. The brake release lever has the advantages of preventing the brake release lever from rotating beyond a range and improving the safety of an operating mechanism.

Inventors

  • CHEN BIN
  • DING XIAOHUI
  • ZHOU MINCHEN

Assignees

  • 常熟开关制造有限公司(原常熟开关厂）
  • 常熟开关制造有限公司(原常熟开关厂）

Dates

Publication Date
20260421
Application Date
20220705
Priority Date
20220705

Claims (10)

  1. 1. An operating mechanism of a circuit breaker comprises a pair of side plates (11), a connecting rod assembly (13), a brake separating lever (15) and a brake separating half shaft (16), wherein the brake separating half shaft (16) is in snap fit with the brake separating lever (15), the brake separating lever (15) is in snap fit with the connecting rod assembly (13), the connecting rod assembly (13) comprises a first connecting rod (131), a second connecting rod (132), a locking rod (133) and a swinging rod (134), one end of the first connecting rod (131) is hinged with the second connecting rod (132), the other end of the first connecting rod is hinged with the locking rod (133), the locking rod (133) is rotatably arranged between the pair of side plates (11), the other end of the second connecting rod (132) is hinged with the swinging rod (134), the swinging rod (134) is fixed on a main shaft (14) and synchronously rotates along with the main shaft (14), the operating mechanism is characterized by further comprising a blocking device 133 which comprises a blocking part located on the locking rod (133) and one part of the brake separating lever (15) which is matched with the brake separating half shaft (15) in a process of the brake separating lever (15), the locking rod (133) pushes the brake separating lever (15) to rotate until the locking rod (133) is unlocked, and then the blocking part (1334) collides with the matching part (155) to prevent the brake separating lever (15) from continuing to rotate.
  2. 2. The operating mechanism of a circuit breaker as set forth in claim 1 wherein said blocking portion (1334) is located on said latch lever (133) and said mating portion (155) is located on said trip lever (15).
  3. 3. The operating mechanism of a circuit breaker as set forth in claim 1 wherein said blocking portion (1334) is located on said trip lever (15) and said mating portion (155) is located on said latch lever (133).
  4. 4. The operating mechanism of a circuit breaker according to claim 2, wherein the opening lever (15) comprises a mounting shaft (151) and a pair of lever pieces (152), the lever pieces (152) are arranged at intervals, one end of each lever piece is rotatably arranged between the pair of side plates (11) through the mounting shaft (151), an abutting shaft (153) and a fixing shaft (154) are arranged between the lever pieces (152), the fixing shaft (154) is used for ensuring that the lever pieces (152) are arranged at intervals, the abutting shaft (153) is used for being in snap fit with the locking rod (133), and the matching part (155) is arranged between the lever pieces (152).
  5. 5. An operating mechanism for a circuit breaker according to any of claims 2 or 3 wherein the blocking portion (1334) is hook-shaped.
  6. 6. The operating mechanism of a circuit breaker as recited in claim 4 wherein said mating portion (155) is a circular shaft proximate to the rotational ends of said pair of lever plates (152).
  7. 7. The operating mechanism of a circuit breaker as recited in claim 4 wherein the latch lever (133) further comprises a catch portion (1333), the catch portion (1333) being a recess, the catch portion (1333) being snap-fit with the abutment shaft (153).
  8. 8. The operating mechanism of a circuit breaker according to claim 4, wherein the mounting shaft (151) is sleeved with a return spring (1511) to provide a return force for the breaking lever (15) to swing downward.
  9. 9. The operating mechanism of a circuit breaker as set forth in claim 4 wherein said latch lever (133) further has an outer peripheral surface (1335), said outer peripheral surface (1335) being in contact engagement with said abutment shaft (153) after said latch lever (133) is unlocked, said blocking portion (1334) having an inner peripheral surface (1336) on an inner side thereof, said inner peripheral surface (1336) being adapted to block said engagement portion (155), said outer peripheral surface (1335) and said inner peripheral surface (1336) being arc surfaces centered about a center of rotation of said latch lever (133).
  10. 10. The operating mechanism of a circuit breaker as claimed in claim 9, wherein the first operating angle between the abutment shaft (153) of the breaking lever (15) and the mating portion (155) is smaller than the second operating angle of the outer edge surface (1335) of the latch lever (133).

Description

Operating mechanism of circuit breaker Technical Field The invention belongs to the technical field of piezoelectric devices, and particularly relates to an operating mechanism of a circuit breaker. Background The universal circuit breaker is widely used in low-voltage power supply and distribution systems due to its excellent protection characteristics. The circuit breaker comprises an operating mechanism for executing the switching operation of the circuit breaker, and the operating mechanism is a core component part of the circuit breaker. With the increase of the capacity of the power system, the consumption of the large-capacity universal circuit breaker is increased year by year, and the large-capacity universal circuit breaker has larger contact energy, and part of the contact energy is absorbed by the mechanism impact during opening. Specifically, as shown in fig. 1 and 2, the operating mechanism 1 is mounted at the front part of the base 2, and the operating mechanism 1 provides power for the switching action of the contact system inside the base 2. The operating mechanism 1 includes a pair of side plates 11 and a top plate 12 positioned on top of the operating mechanism 1, and a plurality of components are mounted on the top plate 12. When the operating mechanism 1 is overhauled, the top plate 12 is often required to be detached, and the operating mechanism is often required to be combined or separated to observe where a problem is. At this time, in the process of opening the brake by the operating mechanism 1, the brake opening half shaft 16 of the operating mechanism 1 rotates, so that the brake opening lever 15 of the operating mechanism 1 is forced to rotate, and the rotation of the brake opening lever 15 after unlocking brings a certain potential safety hazard to an operator. The connecting rod assembly 13 of the operating mechanism 1 comprises a first connecting rod 131, a second connecting rod 132, a locking rod 133 and a swinging rod 134, wherein two ends of the first connecting rod 131 are respectively hinged with one end of the second connecting rod 132 and the locking rod 133, and the other end of the second connecting rod 132 is hinged with the swinging rod 134. The swing rod 134 is fixed on the main shaft 14 and can rotate along with the main shaft 14. Because the brake release lever 15 is abutted against the lock catch lever 133 on the connecting rod assembly 13 of the operating mechanism 1 in the switch-on state, the lock catch lever 133 can apply rotating power to the brake release lever 15, and the larger the energy of the operating mechanism 1 is, the larger the rotating power applied to the brake release lever 15 by the lock catch lever 133 is, so that the rotating of the brake release lever 15 after unlocking brings about greater potential safety hazard to operators. In view of the above-described prior art, there is a need for a rational improvement to the operating mechanisms of existing circuit breakers. To this end, the inventors have advantageously devised that the technical solutions described below are created in this context. Disclosure of Invention The invention aims to provide an operating mechanism of a circuit breaker, which is provided with a matched blocking device on a locking rod and a brake release lever, so that the brake release lever is prevented from continuing to rotate after unlocking, and the safety of the operating mechanism is improved. The invention aims to achieve the purpose that an operating mechanism of a circuit breaker comprises a pair of side plates, a connecting rod assembly, a brake separating lever and a brake separating half shaft, wherein the brake separating half shaft is in snap fit with the brake separating lever, the brake separating lever is in snap fit with the connecting rod assembly, the connecting rod assembly comprises a first connecting rod, a second connecting rod, a locking rod and a swinging rod, two ends of the first connecting rod are respectively hinged with the second connecting rod and the locking rod, the locking rod is rotatably arranged between the pair of side plates, the other end of the second connecting rod is hinged with the swinging rod, the swinging rod is fixed on a main shaft and synchronously rotates along with the main shaft, and the operating mechanism further comprises a blocking device, the blocking device comprises a blocking part positioned on any one of the locking rod and the brake separating lever and a matching part positioned on the other one of the locking rod and the brake separating lever, during brake separating, the brake separating half shaft is unlocked, and the locking rod pushes the brake separating lever to rotate until the locking rod is continuously matched with the blocking part of the brake separating lever in a collision mode. In a specific embodiment of the present invention, the blocking portion is located on the latch lever, and the mating portion is located on the release lever.