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CN-122025480-A - Large-opening-distance miniature circuit breaker

CN122025480ACN 122025480 ACN122025480 ACN 122025480ACN-122025480-A

Abstract

A large-opening-distance miniature circuit breaker. The problem that the existing circuit breaker is small in opening distance and cannot break large current is solved. The movable contact comprises a shell, a fixed contact and a movable contact, wherein the movable contact is provided with a first position attached to the fixed contact and a second position separated from the fixed contact, an operating mechanism is connected with the operating mechanism, the operating mechanism comprises a contact frame, a jump buckle, a lock catch and a baffle, a first mounting hole and a second mounting hole are formed in the contact frame, the baffle is hinged to the contact frame at the first mounting hole, a clamping groove for the movable contact to pass through is formed in the baffle, the baffle is in linkage with the movable contact, a contact torsion spring is sleeved on a middle shaft, and the contact torsion spring has a movement trend that the movable contact tends to the second position through the baffle driving. The invention has the advantages of simple structure, convenient assembly, reliable action and the like.

Inventors

  • SUN BINPENG
  • TANG TING
  • GU XIANG
  • WANG RUILIN

Assignees

  • 环宇高科有限公司

Dates

Publication Date
20260512
Application Date
20260210

Claims (10)

  1. 1. The large-opening miniature circuit breaker comprises a shell (1) and an operating handle (2), and is characterized by further comprising: The fixed contact (3) is arranged in the shell (1); The movable contact (4) is arranged in the shell (1), and the movable contact (4) is provided with a first position attached to the fixed contact (3) and a second position separated from the fixed contact (3); The arc extinguishing system (5) is arranged in the shell (1) and is used for extinguishing an electric arc generated when the moving contact (4) is separated from the fixed contact (3); The operating mechanism (6) is arranged in the shell (1), the operating handle (2) is connected with the operating mechanism (6), the operating mechanism (6) comprises a contact frame (61), a jump buckle (62), a lock catch (63) and a baffle plate (64), a first mounting hole (611) and a second mounting hole (612) are formed in the contact frame (61), the baffle plate (64) is hinged with the contact frame (61) at the first mounting hole (611), a clamping groove (641) for a moving contact (4) to pass through is formed in the baffle plate (64), and the baffle plate (64) is linked with the moving contact (4); The contact torsion spring (7) is sleeved on the intermediate shaft (11), one end of the contact torsion spring (7) is propped against the shell (1), the other end of the contact torsion spring is propped against the baffle plate (64), and the contact torsion spring (7) has a movement trend that the movable contact (4) is driven to tend to a second position through the baffle plate (64); and the tripping system (8) is arranged in the shell (1) and is used for fault tripping.
  2. 2. The large-opening miniature circuit breaker according to claim 1, wherein the contact frame (61) is arranged on the shell (1) through an intermediate shaft (11), the lock catch (63) is hinged with the contact frame (61) through the intermediate shaft (11), the movable contact (4) is hinged with the contact frame (61) at a first mounting hole (611), the jump catch (62) is hinged with the contact frame (61) through a second mounting hole (612), the lock catch (63) is provided with a first position which is matched with the jump catch (62) and is in linkage with the movable contact and a second position which is in rotation unlocking with the jump catch (62), the slide hole (41) is arranged on the movable contact (4), and the intermediate shaft (11) is arranged through the slide hole (41) and enables a swing gap to be reserved between the movable contact (4) and the intermediate shaft (11).
  3. 3. The large-opening miniature circuit breaker according to claim 1 is characterized in that a first boss portion (642) is arranged on the baffle plate (64), a bump (12) is arranged on the shell (1), one end of the contact torsion spring (7) is abutted against the bump (12), the other end of the contact torsion spring (7) is abutted against the first boss portion (642) and has a movement trend of driving the moving contact (4) to tend to a second position through the first boss portion (642), a limiting end portion (643) for limiting the movement of the moving contact (4) is arranged on the baffle plate (64), and the limiting end portion (643) is abutted against the bump (12) when the moving contact (4) is in the second position.
  4. 4. The large-opening miniature circuit breaker according to claim 1, characterized in that the housing (1) is provided with a separation edge (13), the separation edge (13) separates the space in the housing (1) into an operation space (14) and an arc extinguishing space (15), and the moving contact (4) is arranged in the arc extinguishing space (15) from the operation space (14) through the separation edge (13) on the housing (1).
  5. 5. The large-opening miniature circuit breaker according to claim 4, characterized in that a second boss portion (644), a third boss portion (645) and a baffle mounting portion (646) are arranged on the baffle (64), the second boss portion (644), the third boss portion (645) and the baffle mounting portion (646) are mutually matched to form the clamping groove (641) for the moving contact (4) to pass through, and projections of the second boss portion (644) and/or the third boss portion (645) on a vertical surface exceed projection settings of the baffle mounting portion (646) and the separation edge (13) on the vertical surface.
  6. 6. The large-opening miniature circuit breaker according to claim 4, characterized in that the separation edge (13) is arranged on the housing (1) in an arc shape along the movement track of the moving contact (4), and the baffle (64) is arranged in the operation space (14) above the separation edge (13).
  7. 7. The large-opening miniature circuit breaker according to claim 4, characterized in that said arc extinguishing system (5) comprises two arc extinguishing chambers (51), said two arc extinguishing chambers (51) being arranged in the arc extinguishing space (15), wherein one arc extinguishing chamber (51) is arranged on the path of the moving contact (4) moving from its first position to its second position.
  8. 8. The large-opening miniature circuit breaker according to claim 1, further comprising an indicator (9) for indicating, wherein the indicator (9) is hinged on the housing (1) and can rotate relative to the housing (1), and the contact frame (61) is provided with a pulling piece (613) for driving the indicator (9) to rotate.
  9. 9. The large-opening miniature circuit breaker according to claim 8, characterized in that the indicator (9) is provided with an opening (91), the pulling piece (613) is inserted into the opening (91) and drives the indicator (9) to rotate relative to the housing (1) when the contact frame (61) rotates, and when the moving contact (4) is in the first position and the second position, the projection of the opening (91) facing to the horizontal plane falls on the left side and the right side of the intermediate shaft (11).
  10. 10. The large-opening miniature circuit breaker according to claim 8, characterized in that the lock catch (63) is provided with a supporting surface (631), the trip button (62) is provided with a snap surface (621), and the snap surface (621) is attached to the supporting surface (631) so that the lock catch (63) is linked with the trip button (62).

Description

Large-opening-distance miniature circuit breaker Technical Field The invention relates to a circuit breaker, in particular to a large-opening-distance miniature circuit breaker. Background The circuit breaker is a mechanical switching device which can switch on, bear and break the current under the normal circuit condition and can switch on, bear and break the current under the abnormal circuit condition in a specified time. When the circuit generates fault current, the circuit breaker is disconnected, an arc can be generated between the moving contact and the fixed contact, the arc is required to be completely disconnected and extinguished through the whole set of arc extinguishing system, so that fault equipment and lines are disconnected with a power grid, and the protection effect on the equipment and the lines is realized. When the arc is introduced into the arc-extinguishing chamber, the metal grid sheet in the arc-extinguishing chamber is divided into a plurality of sections, and each section of arc generates a near-pole voltage near the metal grid sheet, so that the voltage drop of the whole arc is rapidly improved, and the arc is extinguished. At present, a new energy system is rapidly developed, and in order to reduce the cost and increase the efficiency, the improvement of the system voltage is a main mode of improving the efficiency and reducing the cost of new energy related systems such as photovoltaic, energy storage, charging piles and the like. However, increasing the voltage significantly increases the difficulty of arc breaking of the circuit breaker, and the number of times of electrical life is also significantly reduced. The new energy related system is generally a low-voltage direct current system, the electric arc can not be automatically extinguished in the zero crossing process, and the electric arc voltage is improved in the manners of elongating the electric arc, cooling the electric arc, compressing the electric arc and cutting the electric arc by a metal grid sheet in the breaking process, so that the direct current is forced to cross zero. When the arc voltage is greater than the power supply voltage on both sides of the circuit breaker, the arc current starts to decrease, and when the arc current is zero, the arc is completely broken and extinguished. The existing circuit breaker is generally smaller in opening distance, poor in overall arc striking structure, generally about 5.5mm in opening distance (distance between a moving contact and a fixed contact) of a moving contact, and when the voltage of a direct-current system is higher, even if the moving contact is completely opened, an electric arc is still connected with the moving contact and the fixed contact in series, so that a product is difficult to break. In the existing miniature circuit breaker, a general mechanism adopts a tension spring and a compression spring to realize the acting force of opening and closing of the circuit breaker, when the opening distance of the circuit breaker is increased, the two springs cannot realize larger deformation distance due to the fact that the rotation angle of the mechanism is too large, and the acting force of opening and closing of the circuit breaker cannot be reliably provided. Disclosure of Invention The invention provides a large-opening-distance miniature circuit breaker, which aims to solve the problem that the existing circuit breaker in the background art is smaller in opening distance and cannot break large current. The technical scheme of the invention is that the large-opening-distance miniature circuit breaker comprises a shell and an operating handle, and further comprises: The fixed contact is arranged in the shell; The movable contact is arranged in the shell and is provided with a first position attached to the fixed contact and a second position separated from the fixed contact; the arc extinguishing system is arranged in the shell and is used for extinguishing an electric arc generated when the moving contact and the fixed contact are separated; the operating mechanism comprises a contact frame, a jump buckle, a lock catch and a baffle plate, wherein a first mounting hole and a second mounting hole are formed in the contact frame, and the baffle plate is hinged with the contact frame at the first mounting hole; The contact torsion spring is sleeved on the intermediate shaft, one end of the contact torsion spring is propped against the shell, the other end of the contact torsion spring is propped against the baffle, and the contact torsion spring has a movement trend that the movable contact tends to the second position through the baffle; and the tripping system is arranged in the shell and is used for fault tripping. The invention further improves that the contact frame is arranged on the shell through the intermediate shaft, the lock catch is hinged with the contact frame through the intermediate shaft, the movable contact is hinged with the contact frame