南水北调东线一期工程灯泡贯流泵结构特点

对南水北调东线一期工程中不同结构型式的灯泡贯流泵,按照工况调节方式和传动方式及总体结构的组合,归纳为变频调节整体紧凑结构型(I型)、变频调节现场可拆装结构型(II型)、齿轮箱传动机械全调节现场可拆装结构型(III型)和液压全调节现场可拆装结构型(IV型)等4种结构型式.根据机械和液压式叶片全调节以及变频变速调节等工况调节方式,以及直接传动和通过减速齿轮箱的间接传动的不同传动方式,对4种不同结构型式的主要特点进行了定性和定量分析.研究结果表明:不同结构的灯泡贯流泵均安全、可靠,其中IV型结构机组在最大水推力及反向推力等不利工况下,最大变形值约为0.2 mm,不同部位的变形差小于0.1 mm,但在结构特性方面有明显差异.IV型机组的重量达225 t,约为I型结构的3倍;与叶片调节相比,采用变频变速调节时,不仅能够简化机组的结构,而且水泵可以采用柱形轮毂,提高效率1.6%以上.

Structural features of bulb tubular pumps in first phase of South-to-North Water Diversion Eastern Route Project in China

According to the blade regulation method and power transmission mode, the structure of bulb tubular pumps installed in the first phase of South-to-North Water Diversion Eastern Route Project in China can be classified into four kinds, i.e. compact structure with variable frequency drives(VFD)(type Ⅰ), dismountable structure with VFD(type Ⅱ), dismountable structure with gearbox power transmission chain and mechanical blade regulation mechanism(type Ⅲ), and dismountable structure with hydraulic blade regulation mechanism(type Ⅳ). Based on the blade regulation method, pump operational condition adjusting approach and power transmission chain, the major advantages and disadvantages of these structures are analyzed qualitatively and quantitatively. The result shows that even though all the four kinds of pump structure are safe and reliable, in which the maximum deformation of type Ⅳ is about 0.2 mm and the deformation differences between various locations is less than 0.1 mm under the positive and negative peak axial thrust conditions, there are some notable differences in the structure features. For instance, the weight of type Ⅳ unit is 225 t, about three times type Ⅰ. Compared with the mechanical blade regulation method, the structure with VFD is simple, but also a cylindrical hub can be adopted in the pumps, so that the pump efficiency can be improved by over 1.6%.