针对三叶罗茨风机排气端的高压气体的回流问题,分析了采用传统的矩形排气口和新的异型排气口的不同情况;给出菱形排气口、平行四边形排气口的回流面积计算公式,并根据计算结果,提出b角的合理选择范围。 Aiming at the problem of backflow of high-pressure gas at the exhaust end of the three-lobed Roots blower fan, the different situations of using the traditional rectangular exhaust port and the new shaped exhaust port are analyzed. The backflow area of ​​the diamond exhaust port and the parallelogram exhaust port is given Calculate the formula, and according to the calculation result, put forward the reasonable choice range of b angle.