Electromagnetic Relay Airflow Guide Wall for Arc-Resistant Contacts

The patent introduces a guide wall as an intermediary structure that redirects the airflow generated by the short-circuit current. The guide wall channels this airflow toward the second surface of the movable contact piece, creating a pressure differential that generates an additional force on the contacts. This intermediary structure allows the system to achieve higher contact force without proportionally increasing the drive device size, as the guide wall leverages the existing electromagnetic energy to produce mechanical force.

The patent converts the harmful effect of high current (which causes contacts to melt and scatter) into a beneficial force. The short-circuit current generates an airflow through electromagnetic interaction, and the guide wall directs this airflow to press the movable contact piece against the fixed contact. Thus, the same high current that could damage the contacts is transformed into a welding-assisting force that improves contact bonding while maintaining reliability.

The patent implements a self-service mechanism where the short-circuit current itself generates the airflow that provides the additional contact force. The system uses its own operating energy (the current flowing through the contacts) to create the welding-assisting force, rather than requiring an external or more complex drive mechanism. The guide wall simply redirects this self-generated airflow, maintaining simplicity while achieving the desired high contact force for welding.