The invention relates to the technical field of draught fans, in particular to a twin-stage
impeller high-pressure axial flow draught fan for shipbuilding. The twin-stage
impeller high-pressure axial flow draught fan for the shipbuilding comprises a draught fan body, wherein the draught fan body is composed of impellers, a motor, a wind
barrel, guide vanes, a support and an
electric control device. The twin-stage
impeller high-pressure axial flow draught fan for the shipbuilding is characterized in that a wind collecting device, a
reducer pipe and flow collecting devices are arranged, the
reducer pipe and the wind collecting device are respectively formed by drawing a
metal plate around to form a tubular shape, the
reducer pipe is in a
frustum shape, the wind collecting device is in a horn shape, the wind outlet end of the wind
barrel is connected with the small-
diameter end of the reducer pipe, the wind inlet end of the wind
barrel is connected with the small-opening end of the wind collecting device, a protection screen is arranged at the large-opening end of the wind collecting device, a flow collecting plate is arranged at the large-
diameter end of the reducer pipe, more than two flow collecting holes are formed in the circumference of the flow collecting plate, the flow collecting devices are arranged in the flow collecting holes, each flow collecting device is formed by a channel, a wind volume regulating valve and a protecting screen, the channels are in a
cylindrical tube shape, the wind volume regulating valves are arranged on the channels, the protecting screens are arranged at the front ends of the channels, and the rear ends of the channels are fixedly connected with the flow collecting plate. Due to the adoption of the structure, the twin-stage impeller high-pressure axial flow draught fan for the shipbuilding has the advantages of being novel in structure, high in anti-collision strength, high in protecting performance and capable of damping and preventing sliding, meeting the requirements for multiple working stations and adjustable wind volume, having the functions of wind discharging and wind delivery, ensuring the normal starting and normal operation and the like.