Air pre-heater sealing structure with high tightness

The utility model provides an air pre-heater sealing structure with high tightness, which relates to the technical field of sealing structures, and comprises an air pre-heater body, the surface of the air pre-heater body is provided with a cold air inlet, a flue gas inlet, a hot air outlet and a flue gas outlet, and the surface of the air pre-heater body is fixedly provided with a fixing block. A fixing ring is rotatably connected to the interior of the fixing block, a rotating rod is fixedly installed on the surface of the fixing ring, a clamping block is fixedly installed on the surface of the fixing ring, and an inserting strip is slidably connected to the interior of the clamping block. By arranging a fixing block, a torsional spring and a rotating rod, the effect that a fixing ring is bounced off from an air outlet when an inserting strip and a threaded hole are opened is achieved, and therefore the effect that the fixing ring is convenient to open is achieved, and by means of the design of the inserting