Saddle-area-free axial flow fan

Abstract

The invention belongs to the field of fan technology and relates to a saddle-free axial flow fan, comprising a fan inlet, a conical annular flow stabilizer, a rectifying grid, a conical joint, a fan impeller and a fan outer cylinder; the conical annular flow stabilizer includes a stabilizer The outer cylinder of the current stabilizer and the inner cylinder of the current stabilizer; one end of the outer cylinder of the current stabilizer is fixedly connected to the inlet of the fan, and the other end is fixedly connected to the outer cylinder of the fan through the tapered joint; the rectifier grid is connected to the outer cylinder of the current stabilizer The tube is fixedly connected; the inner tube of the current stabilizer is welded on the rectifying grid; the inner tube of the current stabilizer has a missing ring at the inlet of the fan; the invention can transfer the secondary return flow generated by the top of the fan blade when the flow rate is small to the cone ring stabilizer The flow device is exported to the impeller, then merged into the main flow, and re-enters the impeller after being rectified by the rectifying grid, which can effectively eliminate the influence of the secondary backflow on the fan inlet, avoid the pressure loss caused by the impeller outlet airflow impacting the cylinder wall, and thus eliminate the performance curve of the axial flow fan The saddle area in the middle; can improve the stability and safety of the axial flow fan operation.

Description

technical field [0001] The invention belongs to the field of fan technology, and in particular relates to a saddle-free axial flow fan, which is mainly used in occasions requiring a pipeline type axial flow fan, especially the occasion requiring continuous, safe and stable operation of the axial flow fan under large and small flow rates. Background technique [0002] Fan is a machine used to convey gas, widely used in various sectors of the national economy, especially in the fields of mining, metallurgy, petroleum, chemical industry, aerospace and energy. For general axial flow fans, there is a saddle area in their performance curves. When the flow rate decreases to a certain value, the pressure of the fan will drop rapidly and then rise again. Due to the existence of the saddle area, the pressure of the fan will be lower than the flow rate. About 80% to 90% of the design value will start to drop and enter the unstable working area. At this time, the fan will stall and surg...

AI Technical Summary

Problems solved by technology

Therefore, during the use of the axial flow fan, the saddle area will be avoided, but when the required air volume decreases, the traditional method is to switch to a fan with a smaller design flow rate, which is costly and inconvenient to operate. To meet the requirements of some special occasions, it is urgent to design a saddle-free axial flow fan

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