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CN-224232628-U - Clamping type contact mechanism and circuit breaker

CN224232628UCN 224232628 UCN224232628 UCN 224232628UCN-224232628-U

Abstract

The utility model discloses a clamping type contact structure which comprises a fixed contact assembly and a moving contact assembly, wherein the fixed contact assembly comprises a bus, a clamping head and a fixed contact are arranged at the top of the bus, the clamping head is positioned between the middle part and the tail end of the bus, the fixed contact is positioned at the tail end of the bus, the moving contact assembly comprises a moving contact support, a main contact and a clamping type contact, the moving contact support can drive the main contact and the clamping type contact to rotate towards the direction close to or far from the fixed contact, the tail end of the main contact and the tail end of the clamping type contact are both arranged on the moving contact support, the head end of the clamping type contact is in separated contact with the clamping head, and silver contacts which are in separated contact with the fixed contact are respectively arranged at the bottoms of the main contact and the clamping type contact. The utility model adopts a clamping type contact mode on the basis of the attaching type contact, can effectively prevent the moving contact from being separated from the fixed contact after being sprung up under the electric repulsive force of short-circuit current, reduces the generation of electric arcs, and improves the breaking performance and the safety of the circuit breaker.

Inventors

  • LUO SIKE
  • HE GUOBIAO
  • ZHU RONGWU

Assignees

  • 贵州泰永长征技术股份有限公司

Dates

Publication Date
20260512
Application Date
20250415

Claims (10)

  1. 1. The utility model provides a centre gripping formula contact structure, includes static contact subassembly (3) and moving contact subassembly (4), its characterized in that: The static contact assembly (3) comprises a bus (31), a clamping head (33) and a static contact (34) are arranged at the top of the bus (31), the clamping head (33) is positioned between the middle part and the tail end of the bus (31), the static contact (34) is positioned at the tail end of the bus (31), and the top height of the clamping head (33) is larger than the top height of the static contact (34); The movable contact assembly (4) comprises a movable contact support (41), a main contact (43) and a clamping contact (44), wherein the movable contact support (41) can drive the main contact (43) and the clamping contact (44) to rotate towards a direction close to or far away from the fixed contact (34), the tail end of the main contact (43) and the tail end of the clamping contact (44) are arranged on the movable contact support (41), the head end of the clamping contact (44) is in separated contact with the clamping head (33), and silver contacts (45) in separated contact with the fixed contact (34) are respectively arranged at the bottoms of the main contact (43) and the clamping contact (44).
  2. 2. The clamped contact structure of claim 1, wherein: When the main contact (43) and the clamping contact (44) are driven by the movable contact bracket (41) to approach the fixed contact assembly (3), the head end of the clamping contact (44) is contacted with the clamping head (33) first, and then the silver contacts (45) on the main contact (43) and the clamping contact (44) are contacted with the fixed contact (34); When the main contact (43) and the clamping contact (44) are far away from the fixed contact assembly (3) under the drive of the movable contact bracket (41), the silver contacts (45) on the main contact (43) and the clamping contact (44) are separated from the fixed contact (34) first, and then the head end of the clamping contact (44) is contacted and separated with the clamping head (33).
  3. 3. The clamping type contact structure according to claim 1, wherein the static contact assembly (3) further comprises an arc striking piece (32), the arc striking piece (32) is arranged at the top of the bus bar (31) and is close to the clamping head (33), the clamping head (33) is positioned between the arc striking piece (32) and the static contact (34) and used for dividing and elongating an electric arc, and the cooling and de-ionization processes of the electric arc are accelerated to achieve extinction of the electric arc.
  4. 4. The structure of claim 3, wherein when the head end of the clip contact (44) contacts the clip head (33), the end of the head end of the clip contact (44) is located between the clip head (33) and the striking plate (32) to serve as the striking contact.
  5. 5. The clamping type contact structure according to claim 1, wherein the movable contact assembly (4) further comprises a contact spring (42), one end of the contact spring (42) is fixed on the movable contact support (41), and the other end of the contact spring is connected to the main contact (43) and the clamping type contact (44) for providing contact pressure.
  6. 6. The structure of claim 5, wherein the tail end of the main contact (43) and the tail end of the clamping contact (44) are rotatably mounted on the same shaft preset on the moving contact bracket (41), and the main contact (43) and the clamping contact (44) are mutually attached to form a moving contact mechanism.
  7. 7. The clamping type contact structure according to claim 6, wherein the movable contact support (41) is provided with at least one mounting groove, each cavity is internally provided with a movable contact mechanism in a rotating mode, the head end of each movable contact mechanism extends out of the mounting groove to be in separated contact with the fixed contact assembly (3), a contact spring (42) is correspondingly connected to each movable contact mechanism, the upper end of the contact spring (42) is fixed at the top of the inner side of the mounting groove, the lower end of the contact spring is arranged at the top of the movable contact mechanism, the number of the clamping heads (33) is consistent with that of the movable contact mechanisms, the clamping type contacts (44) of each movable contact mechanism are in separated contact with the corresponding clamping heads (33).
  8. 8. The structure of claim 1, wherein the clamping head (33) is a U-shaped clamping structure formed by two contact pieces (331) symmetrically arranged at the top of the bus bar (31), a guide groove for clamping and limiting the movement range of the clamping contact (44) is formed between the two contact pieces (331), and the top height of the two contact pieces (331) is larger than the top height of the stationary contact (34).
  9. 9. The structure of claim 8, wherein the two contact blades (331) are made of elastic metal sheets, and the upper parts of the inner sides of the two contact blades are protruded inwards to form a neck part at the upper part of the guide groove.
  10. 10. A circuit breaker, characterized by comprising a base (1), a bottom plate (2) and at least one clamping contact structure as claimed in any one of claims 1-9, wherein the base (1) and the bottom plate (2) are cooperatively installed to form at least one cavity (5) for installing the clamping contact structure, each cavity (5) is provided with one clamping contact structure, adjacent cavities (5) are separated, and the moving contact assembly (4) can rotate in the cavity (5).

Description

Clamping type contact mechanism and circuit breaker Technical Field The utility model belongs to the technical field of piezoelectric equipment, and particularly relates to a clamping type contact structure and a circuit breaker. Background The universal circuit breaker is used for distributing electric energy and protecting circuits and power supply equipment from faults such as overload, undervoltage, short circuit, single-phase grounding and the like. In the prior art, a moving contact of the circuit breaker usually adopts a clapping type contact mode, but under the action of electric repulsive force of short-circuit current, the moving contact is easy to bounce instantly, poor contact is caused, an electric arc is generated, and breaking performance and safety of the circuit breaker are affected. In addition, the generation of electric arc can also accelerate the abrasion of the contact, and the service life of the circuit breaker is reduced. Disclosure of utility model In order to solve the above problems, an object of the present utility model is to provide a clamp type contact structure and a circuit breaker, which can effectively prevent a moving contact from coming out of contact with a stationary contact after being sprung up by an electric repulsive force of a short-circuit current, and reduce the generation of an arc. The aim of the utility model is achieved by the following technical scheme: The clamping type contact structure comprises a fixed contact assembly and a movable contact assembly, wherein the fixed contact assembly comprises a bus, the head end of the bus is connected with the movable contact assembly, the tail end of the bus is close to the movable contact assembly, a clamping head and a fixed contact are arranged at the top of the bus, the clamping head is positioned between the middle part and the tail end of the bus, the fixed contact is positioned at the tail end of the bus, the top height of the clamping head is larger than the top height of the fixed contact, the movable contact assembly comprises a movable contact support, a main contact and a clamping type contact, the movable contact support can drive the main contact and the clamping type contact to rotate towards the direction close to or far from the fixed contact, the tail ends of the main contact and the clamping type contact are both arranged on the movable contact support, the head ends of the clamping type contact are in separated contact, and silver contacts in separated contact with the fixed contact are respectively arranged at the bottoms of the main contact and the clamping type contact. When the main contact and the clamping contact are driven by the moving contact bracket to approach the static contact assembly, the head end of the clamping contact is contacted with the clamping head first, and then the silver contacts on the main contact and the clamping contact are contacted with the static contact. When the main contact and the clamping contact are driven by the moving contact bracket to be far away from the fixed contact assembly, the silver contacts on the main contact and the clamping contact are separated from the fixed contact, and then the head end of the clamping contact is contacted and separated from the clamping head. Further, the static contact assembly further comprises an arc striking piece, wherein the arc striking piece is arranged at the top of the bus and is close to the clamping head, so that the clamping head is positioned between the arc striking piece and the static contact, and the arc is divided and elongated, the cooling and de-ionization processes of the arc are accelerated, and the extinction of the arc is realized. Further, the movable contact assembly further comprises a contact spring, one end of the contact spring is fixed on the movable contact support, and the other end of the contact spring is connected to the main contact and the clamping type contact and used for providing contact pressure. The utility model also provides a circuit breaker, which comprises a base, a bottom plate and at least one clamping type contact structure, wherein the base and the bottom plate are matched and installed to form at least one cavity for installing the clamping type contact structure, each cavity is provided with one clamping type contact structure, adjacent cavities are separated, and the moving contact assembly can rotate in the cavity. The utility model adopts a clamping type contact mode on the basis of the attaching type contact, can effectively prevent the moving contact from being separated from the fixed contact after being sprung up under the electric repulsive force of short-circuit current, reduces the generation of electric arcs, and improves the breaking performance and the safety of the circuit breaker. Drawings The structure of the present utility model will be described in further detail with reference to the accompanying drawings. Fig. 1 is an exploded structural view o