Moving contact of circuit breaker
By adopting a gas-producing protective cover and knurled shaft design on the moving contacts of the circuit breaker, the problem of the moving contacts being easily ablated by arc is solved, achieving a longer service life and more stable performance.
Patent Information
- Application Number
- CN202421189604.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-28
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-05-28
AI Technical Summary
The dynamic contact structure design of existing plastic case circuit breakers is unreasonable and is easily ablated by arcs, resulting in a short service life.
The design includes a moving contact plate, a gas-producing protective cover and a knurled shaft. The gas-producing protective cover is connected to the moving contact plate through a knurled shaft to form a protective cavity, which can quickly blow the arc and extend the service life, and the arc angle is triggered and The arc surface avoids arc ablation and moving contacts.
It effectively extends the service life of the moving contacts, improves the simplicity of the structure, stability of performance and convenience of assembly, and ensures a compact connection between the gas-producing protective cover and the moving contacts.
Smart Images
Figure CN222338213U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of circuit breakers, in particular to a moving contact of a circuit breaker. Background Art
[0002] Molded case circuit breaker is a commonly used protective electrical appliance. It has the functions of switching on and off load current and protecting load current from overload and short circuit. It is widely used in various power distribution systems and motor overload and short circuit protection. The molded case circuit breaker includes a housing, an operating mechanism, a contact system, and an arc extinguishing system. The structure design of the movable contact of the contact system of the existing molded case circuit breaker is unreasonable. The movable contact is easily burned by the arc, resulting in a short service life of the movable contact. Summary of the invention
[0003] The utility model aims to overcome the defects of the prior art and provide a moving contact of a circuit breaker with simple structure, stable and reliable performance, convenient assembly and long service life.
[0004] To achieve the above-mentioned purpose, the utility model adopts a moving contact of a circuit breaker, including a moving contact piece, a moving contact point arranged on one end of the moving contact piece, and a gas-generating protective cover arranged on the moving contact piece at a side corresponding to the moving contact point. The gas-generating protective cover includes a first gas-generating hood arranged on one side of the moving contact piece, and a second gas-generating hood arranged on the other side of the moving contact piece and matched with the first gas-generating hood. A protective cavity is formed between the first gas-generating hood and the second gas-generating hood, and the protective cavity is wrapped around the moving contact piece. Two knurled shafts are respectively arranged on the moving contact piece corresponding to the first gas-generating hood and the second gas-generating hood, and the two ends of the two knurled shafts are respectively inserted into the through holes of the first gas-generating hood and the second gas-generating hood.
[0005] The beneficial effects of the above structure are: the gas-generating protective cover on the moving contact piece is made of gas-generating material, and the gas-generating protective cover can play an arc-blowing role, and can quickly blow the arc on the moving contact into the arc-extinguishing chamber, which is conducive to quickly extinguishing the arc and extending the service life of the moving contact. The gas-generating protective cover is connected to the moving contact piece through a knurled shaft, which is convenient for assembling the gas-generating protective cover and the moving contact piece, and the assembly efficiency is higher. The gas-generating protective cover and the moving contact piece are not easy to loosen or fall off, thereby ensuring that the connection between the gas-generating protective cover and the moving contact piece is more compact and firm. Therefore, the moving contact of the circuit breaker has the advantages of simple structure, stable and reliable performance, convenient assembly, and long service life.
[0006] In particular, an arc striking angle is provided at one end of the movable contact piece corresponding to the movable contact point, and the arc striking angle can attract the arc at the movable contact point, thereby preventing the arc from burning the movable contact point, and is beneficial to prolonging the service life of the movable contact.
[0007] In particular, the movable contact piece has an arc surface transitionally connected between the movable contact and the arc striking angle. The arc surface can quickly lead the arc at the movable contact to the arc striking angle, thereby avoiding arc erosion of the movable contact and helping to extend the service life of the movable contact.
[0008] In particular, a limiting groove is provided on the movable contact piece at one side corresponding to the movable contact point, and limiting convex strips matching the limiting groove are provided on the first gas generating hood and the second gas generating hood, respectively. The limiting convex strips are engaged in the limiting grooves and constitute the limiting cooperation between the first gas generating hood, the second gas generating hood and the movable contact piece. The first gas generating hood, the second gas generating hood and the movable contact piece are assembled in a limiting cooperation manner, thereby ensuring that the connection between the first gas generating hood, the second gas generating hood and the movable contact piece is more compact.
[0009] In particular, the other end of the movable contact piece has a connection hole, and the movable contact piece has a welding portion at one side corresponding to the connection hole. The movable contact piece is connected to the circuit breaker shaft through the connection hole, so as to facilitate the assembly of the movable contact piece and the circuit breaker shaft. The movable contact piece is welded to the copper braided belt through the welding portion, and the connection reliability is higher. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a stereogram of an embodiment of the utility model.
[0011] Figure 2 It is a cross-sectional view of an embodiment of the utility model.
[0012] Figure 3 This is an exploded view of an embodiment of the utility model. DETAILED DESCRIPTION
[0013] like Figures 1 to 3As shown, the embodiment of the utility model is a moving contact of a circuit breaker, comprising a moving contact piece 10, a moving contact point 11 arranged at one end of the moving contact piece 10, and a gas generating protective cover 12 arranged on the moving contact piece 10 at one side of the moving contact point 11. The gas generating protective cover 12 comprises a first gas generating cover 121 arranged on one side of the moving contact piece 10, and a second gas generating cover 122 arranged on the other side of the moving contact piece 10 and matched with the first gas generating cover 121. A protective cavity 120 is formed between the first gas generating cover 121 and the second gas generating cover 122. The protective cavity 120 wraps around the moving contact piece 10. Two knurled shafts 13 are respectively arranged on the moving contact piece 10 at the corresponding positions of the first gas generating cover 121 and the second gas generating cover 122. The two ends of the two knurled shafts 12 are respectively inserted into the through holes 123 of the first gas generating cover 121 and the second gas generating cover 122. An arc striking angle 101 is provided at one end of the moving contact piece 10 at the corresponding position of the moving contact point 11. The arc striking angle can attract the arc at the moving contact, avoid arc erosion of the moving contact, and help to extend the service life of the moving contact. The moving contact piece 10 has an arc surface 102 that transitions between the moving contact 11 and the arc striking angle 101. The arc surface can quickly lead the arc at the moving contact to the arc striking angle, avoid arc erosion of the moving contact, and help to extend the service life of the moving contact. The moving contact piece 10 is provided with a limiting groove 103 on one side corresponding to the moving contact 11, and the first gas generating hood 121 and the second gas generating hood 122 are respectively provided with limiting convex strips 124 that match the limiting groove 103. The limiting convex strips 124 are engaged in the limiting groove 103, and constitute the limiting cooperation between the first gas generating hood 121, the second gas generating hood 122 and the moving contact piece 10. The first gas generating hood, the second gas generating hood and the moving contact piece are assembled in a limited matching manner, so as to ensure that the connection between the first gas generating hood, the second gas generating hood and the moving contact piece is more compact. The moving contact piece 10 has a connecting hole 104 at the other end, and a welding portion 105 is provided on the moving contact piece 10 corresponding to the connecting hole 104. The moving contact piece is connected to the circuit breaker shaft through the connecting hole, so as to facilitate the assembly of the moving contact piece and the circuit breaker shaft. The moving contact piece is welded to the copper braided belt through the welding portion, and the reliability of the connection is higher.
[0014] The gas-generating protective cover on the moving contact piece is made of gas-generating material. The gas-generating protective cover can play an arc-blowing role, and can quickly blow the arc on the moving contact into the arc-extinguishing chamber, which is conducive to quickly extinguishing the arc and extending the service life of the moving contact. The gas-generating protective cover is connected to the moving contact piece through a knurled shaft, which is convenient for the assembly of the gas-generating protective cover and the moving contact piece, and the assembly efficiency is higher. The gas-generating protective cover and the moving contact piece are not easy to loosen or fall off, thereby ensuring that the connection between the gas-generating protective cover and the moving contact piece is more compact and firm. Therefore, the moving contact of the circuit breaker has the advantages of simple structure, stable and reliable performance, convenient assembly, and long service life.
Claims
1. A moving contact of a circuit breaker, characterized in that: It includes a moving contact piece, a moving contact point arranged on one end of the moving contact piece, and a gas-generating protective cover arranged on the moving contact piece at a side corresponding to the moving contact point. The gas-generating protective cover includes a first gas-generating hood arranged on one side of the moving contact piece, and a second gas-generating hood arranged on the other side of the moving contact piece and matched with the first gas-generating hood. A protective cavity is formed between the first gas-generating hood and the second gas-generating hood, and the protective cavity is wrapped around the moving contact piece. Two knurled shafts are respectively arranged on the moving contact piece corresponding to the first gas-generating hood and the second gas-generating hood, and the two ends of the two knurled shafts are respectively inserted into the through holes of the first gas-generating hood and the second gas-generating hood.
2. The moving contact of the circuit breaker according to claim 1, characterized in that: An arc striking angle is provided at one end of the moving contact piece corresponding to the moving contact point.
3. The moving contact of the circuit breaker according to claim 2, characterized in that: The moving contact piece is provided with an arc surface transitionally connected between the moving contact point and the arc striking angle.
4. The moving contact of the circuit breaker according to claim 1 or 2, characterized in that: A limiting groove is arranged on the movable contact piece at one side corresponding to the movable contact point, and limiting convex strips matching with the limiting groove are arranged on the first gas generating hood and the second gas generating hood respectively. The limiting convex strips are engaged in the limiting groove and constitute the limiting cooperation between the first gas generating hood, the second gas generating hood and the movable contact piece.
5. The moving contact of the circuit breaker according to claim 1 or 2, characterized in that: The other end of the moving contact piece is provided with a connecting hole, and the moving contact piece is provided with a welding portion at one side corresponding to the connecting hole.