Magnetic latching relay capable of resisting short-circuit currents

Abstract

The invention discloses a magnetic latching relay capable of resisting short-circuit currents. The magnetic latching relay comprises a contact part formed by two groups of moving reed parts parallel with each other approximately. The moving reed parts consist of moving reed pieces, moving contacts, moving reed leading-out pieces and static contacts. First bending parts are arranged at the two moving reed pieces respectively, wherein each first bending part has one surface protruding in thickness and the other surface recessed; the protruding directions of the two first bending parts are identical; and bending of the first bending part of one moving reed piece is smaller than bending of the first bending part of the other moving reed piece, so that the protrusion of the first bending part of the one moving reed piece can cooperate with the recession of the first bending part of the other moving reed piece and thus the distance between the two moving reed pieces can be reduced and the effective length of each moving reed piece. Therefore, the electromagnetic attraction force between the two groups of moving reed parts can increase, so that the contact pressure between the contacts can be increased and the short-circuit current can be resisted.

Description

technical field [0001] The invention relates to the technical field of relays, in particular to a magnetic latching relay capable of resisting short-circuit current. Background technique [0002] The structure of the existing magnetic latching relay consists of a magnetic circuit system, a contact system, a driving mechanism and a base. The magnetic circuit system generally consists of two basically symmetrical magnetic circuits, including stationary magnetizer parts, movable magnetizer parts and coils, the contact system includes a moving spring part and a static spring part, and the pushing mechanism is generally acted by a pushing block. The relay coil passes the positive pulse voltage, the magnetic circuit system works, the pushing block pushes the moving spring part, makes the moving and static contacts contact, the relay operates, the coil passes the reverse pulse voltage, the magnetic circuit system works, the pushing block pushes the moving spring part, making the mo...

AI Technical Summary

Problems solved by technology

One of the schemes of this short-circuit current resistance structure, as disclosed in Chinese patent CN201210306861.9, is to use two sets of movable springs in parallel design, and use the current to attract each other to increase the contact pressure of the contacts. However, the structure of this The disadvantages are: the effective length of the moving reed is short, the reaction force is large, the distance between the two groups of moving spring parts is small at the position away from the contact point, and the position close to the contact point is large, resulting in a small electromagnetic attraction at the contact position , and the disadvantages of uneven distribution of electromagnetic attraction. Moreover, because there is a bend near the contact, it will cause a structure similar to a seesaw. On the contrary, it is easy to make the reed at the contact point outward, which reduces the contact pressure

The second solution of this short-circuit current resistance structure, as disclosed in Chinese patent CN201280008648.2, also adopts two sets of moving springs in parallel design, and uses the current to attract each other to increase the contact pressure of the contacts. However, the structure of this The disadvantages are: the effective length of the moving reed is short, the reaction force is large, and the distance between the moving and static contacts between the two groups of moving springs is relatively large, resulting in a small electromagnetic attraction. Moreover, the spring with this structure The sheet has less elasticity and less pressure on the contacts

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