Electrical connection mechanism of plug-in breaker

Abstract

The invention discloses an electrical connection mechanism of a plug-in breaker, which comprises left and right two sets of contact pieces and a bus fixed on an underframe of a drawer seat, wherein a plurality of horizontal plates are extended from the front end of the bus in the draw-out direction of a breaker body, and the horizontal plates are provided with two vertical round holes symmetric about the central axis of the bus; the outer sides of the contact pieces are provided with concave cavities and the middle parts of the inner sides of the contact pieces are provided with trapezoidal grooves; the plurality of pairs of contact pieces are hinged with the bus by pin shafts; the concave cavities arranged on the outer sides of the contact pieces accommodate spring pieces; and the plurality of pairs of contact pieces hinged with the bus are inserted into a rectangular frame, the upper and lower frames of the frame are vertically provided with shaft frame holes, one central shaft is inserted into the shaft frame holes of the frame and the trapezoidal grooves of the contact pieces; the two ends of the central shaft frame limit the rectangular frame through a limiting rod, and the left and right frames of the rectangular frame act on the spring pieces to tightly press the contact pieces on the central shaft frame. The scheme of the invention adopts a rotary structure and has the advantages of excellent electric conductivity, flexible adjustment, compact structure and flexible assembly.

Description

technical field [0001] The invention relates to an electrical connection mechanism for a plug-in circuit breaker, in particular to an electrical connection component for inserting the main body bus bar of the plug-in circuit breaker in an axial direction to realize the connection of the main circuit, otherwise the main circuit is disconnected. Background technique [0002] Existing electrical connection mechanisms for withdrawable circuit breakers, such as figure 1 , 2 As shown, it includes a busbar 112 installed on the bottom frame of the drawer seat, and a contact bridge 111 matched with the busbar 112 . The touch bridge 111 includes contact pieces 101 , 102 , a shaft 103 , a tension spring 104 , and rectangular frames 105 , 107 . Depend on figure 2 It can be seen that there are several pieces of contact pieces 101, 102, one piece of contact piece 101 and one piece of contact piece 102 are used as a group, so they are assembled into two symmetrical rows by stacking sev...

AI Technical Summary

Problems solved by technology

There are the following defects in the electrical connection mechanism of this withdrawable circuit breaker: first, due to the direct contact of the contact bridge 111 on the fixed chuck 113, the contact bridge 111 cannot swing freely when it is installed on the bus bar 112, when the circuit breaker body bus 109 When inserting into the plug-in chuck 114 of the contact bridge 111, there is often a certain deviation between the bus bar 109 of the circuit breaker body and the bus bar 112. This error may be caused by processing or assembly, thus causing the bus bar 109 of the circuit breaker body The resistance to the plug-in chuck 114 increases, and a larger thrust must be applied to overcome it, so the load on the transmission mechanism will be relatively increased; in addition, the connection between the contact bridge 111 and the busbar 112 relies on the horizontal plate 110 on the bottom side of the busbar To limit the position, when there is an error between the bus bar 109 of the circuit breaker body and the bus bar 112, when the bus bar 109 of the circuit breaker body is inserted into the plug-in chuck 114, the contact bridge 111 will be distorted, so that the fixed chuck 113 The surface contact with the plug-in chuck 114 becomes a line contact. In the actual use of the line contact connection method, due to the large contact resistance, the heat of the circuit breaker increases and the loss increases.

However, when the busbar of the circuit breaker body and the contact bridge are not aligned, the adjusted contact bridge will not be able to form a fit with the arc groove fixed on the busbar of the drawer seat, but will form a line contact, which increases the number of broken circuits. device heating

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