Adjustable eddy current sensor for air leakage control system of air preheater

The utility model discloses an adjustable eddy current sensor for an air leakage control system of an air preheater. An eddy current probe is fixedly mounted at the bottom end of a probe rod of a conducting wire seal assembly; a coaxial cable penetrates out of the top end of the probe rod; the probe rod is contained in a probe rod protective sleeve of a corrugated pipe assembly; and the top end and the bottom end of the probe rod extend from the inside of the probe rod protective sleeve outwards; an adjusting device comprises a height adjusting assembly for adjusting relative displacement between the eddy current probe and a sector plate; the height adjusting assembly comprises an adjusting nut and a nut cover plate for preventing the axial movement of the adjusting nut; the adjusting nut is matched and connected with the probe rod through threads, and a base thereof is mounted between the nut cover plate and the top surface of the probe rod protective sleeve on the axial direction. The adjustable eddy current sensor reduces the levelness of the sector plate and the levelness and the height of a radial sealing plate through self adjustability, reduces the requirement of maximal deformation of a rotor and further more easily keeps the validity of the air leakage control system.