Method of increasing air quantity of centrifugal fan

• Main Authors: TU CHENGXU, XU FEI, GAO XIAOYAN, YIN ZHAOQIN, CHEN TAOHOU, BAO FUBING
• Format: Patent
• Language: Chinese; English
• Published: 08.05.2020
• Subjects: BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-POSITIVE DISPLACEMENT PUMPS; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; WEAPONS

The invention discloses a method of increasing air quantity of a centrifugal fan. On the premise of keeping the geometrical shape of an exhaust outlet of a volute unchanged, a molded line of the volute is optimized. In the optimized molded line of the volute, the radius of a volute tongue is decreased and an expansion angle of an outlet is increased. The section form of a volute outlet has a tendency to a gas flowing direction. Speed distribution in the optimized volute is smoother, so that the flowing loss is reduced. The speed change at the optimized volute tongue becomes gentle and the flowing state of a fluid in a runner is improved, so that pressure pulsation in the volute tongue area is reduced and the flowing loss at the volute tongue is reduced. 本发明公开了一种增加离心风机风量的方法。本发明在保持蜗壳排气出口的几何形状不变的前提下，对蜗壳型线进行优化，优化后的蜗壳型线中的蜗舌半径变小，出口扩张角变大，蜗壳出口段型趋于气体流动方向，优化后蜗壳内的速度分布更为平滑，减小了流动损失。优化后蜗舌处的速度变化变得平缓，改善了流道内流体的流动状态，从而使得蜗舌区域压力脉动减小，减小了蜗舌处的流动损失。