Dry gap-adjusting arc suppression coil

The utility model relates to a dry air gap adjusting type arc extinguishing coil which belongs to a protecting device arranged in an electric network. The utility model adopts a movable iron core type structure which belongs to the mode of stepless adjustment and sense, and has broad current adjusting ranges and favorable linear volt-ampere characteristics. The dry coil adopts the design of full insulation and vacuum casting by epoxy resins, which has high insulation levels and strong overloading force. A lifting mechanism of the device adopts a motor to directly drive a speed reducer of a cycloid pin gear, and the speed reducer drives nuts to rotate through a pair of meshed gears; therefore, the speed reducer drives a threaded rod which is matched with the speed reducer to rise and fall, and the purpose of the rise and fall of the movable iron core is achieved. The movable iron core and a clamping member form the rigid structure, both sides of the clamping member and a guide rod are arranged together in the mode of movable fit by a guide sleeve, and the movable iron core is limited to move in a vertical direction only. A matching housing adopts a dismountable aluminium alloy housing with protection levels of IP20. The utility model has the advantages of small maintenance workload, convenient transportation, low noise and temperature rise, high insulation levels, strong overloading force, high reliability and long life time.