Axial flow fan with high temperature resistance for ship desulfurization system

An axial flow fan for a ship desulfurization system, comprising a fan casing operatively securable along an axial direction in a flue gas transmission pipeline of the ship desulfurization system, axial flow fan blades, an insulating layer, and a cold water pipe;

• wherein
• the axial flow fan blades are located at an inner front end of the fan casing and arranged on a circle concentric with a rotating shaft that is inserted in a middle of the axial flow fan blades;
• a middle part of the rotating shaft is sleeved with a first bearing and a second bearing and the first bearing and the second bearing are spaced apart;
• outside of the first bearing and the second bearing are fixedly provided with a cruciform axis support;
• a rear end of the rotating shaft is sleeved with a worm gear, and an upper end of the worm gear is provided with a worm;
• the worm gear meshes with the worm;
• the worm gear and the worm are configured inside a lubricating oil casing;
• and the worm gear is configured to rotate along an axis under a driving of the worm, and to further rotate the rotating shaft and the axial flow fan blades;
• the lubricating oil casing is covered with the insulating layer for blocking a flue gas transmitted along the axial direction outside the insulating layer, thereby avoiding the rotating shaft, the first bearing and the second bearing being adapted to be capable of being in the flue gas transmission pipeline and exposed to the flue gas;
• a layer of steel is provided on an outside of the insulating layer to improve a mounting support for the insulating layer;
• and
• the cold water pipe is coiled inside the insulating layer;
• both ends of the cold water pipe extend out from the fan casing to form a cold water pipe inlet and a cold water pipe outlet, respectively;
• and an inside of the insulating layer is cooled by injecting cold water into the cold water pipe wherein the fan case further comprises
• an axial flow inlet upstream of the axial flow fan blades,
• an axial flow outlet downstream of the fan blades, and
• a sidewall extending from the axial flow inlet to the axial flow outlet,
• wherein the lubricating oil casing extends from the sidewall to the rear end of the rotating shaft, and
• wherein the worm extends radially outward from the rotating shaft such that an outer end of the worm is disposed radially outside the sidewall.