Magnetic latching relay of parallel type magnetic circuit

A magnetic latching relay of a parallel type magnetic circuit, comprising a magnetic circuit portion and a movable spring portion, characterized in that, the magnetic circuit portion comprises an iron core, an armature, an iron yoke, a permanent magnet, a magnetic conductor member, a coil and a coil rack wherein the coil rack comprises;

• a bobbin, one end of the bobbin is provided with a first terminal plate, a first pin, a second pin and a third pin are respectively mounted on the first terminal plate, characterized in that, a groove for guiding an enameled wire is provided at an inner side of the first terminal plate and between the bobbin and the second pin, one end of the groove is connected to the bobbin, the other end of the groove is connected to the second pin;
• the iron yoke is L shaped, formed by a first yoke parallel to the iron core and a second yoke perpendicular to the iron core;
• the coil is wound on the coil rack, the iron core passes through the coil rack, a lower end of the iron core is secured to the second yoke;
• the armature is movably mounted to a hinge portion of the iron yoke, an air gap is formed between one end of the armature and an upper end of the iron core;
• one end of the magnetic conductor member is connected to the first yoke, the other end of the magnetic conductor member is connected to first yoke through the permanent magnet;
• a magnetic isolation portion is provided on the first yoke which is between a joint of the first yoke and the permanent magnet and a joint of the first yoke and the magnetic conductor member, the magnetic isolation portion is configured to increase a magnetic resistance of the magnetic circuit portion, and to adjust balance between magnitudes of setting voltage and resetting voltage of the relay;
• the movable spring portion comprises a movable spring sheet and a movable contact point, the movable spring sheet formed with a first side and a second side, an elastically bendable angle is formed between the first side and the second side;
• the armature is secured to the second side, the first yoke is secured to the first side, the armature is flexibly connected to the first yoke via the movable spring sheet;
• the movable contact point is secured to the second side,
• wherein the permanent magnet and the magnetic conductor member, the first yoke, the second yoke, the iron core and the armature form two parallel permanent magnetic paths;
• the coil and the iron core form a control magnetic path, to control the opening and closing of the air gap;
• the permanent magnetic paths provide a force to maintain the air gap to be closed;
• the movable spring sheet provides a counter force to maintain the air gap to be opened.