Development of 150QJS20 stainless steel casting multistage deep-well pump
Zhang Qihua1, Xu Yuanhui1, Xu Yan1, Ma Dongqi2, Zheng Wei2, Lian Songjin 2, Lu Weigang1
1.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Fujian Academy of Mechanical Sciences, Fuzhou, Fujian 350005, China
Abstract：Stainless steel casting multistage deep-well pumps have been extensively used in some specific applications where excellent corrosion- and wear-resistance as well as long life-span are highly desirable. Because of stainless steel investment casting multistage deep-well pumps with high cost, they are targeted to mid- or high-end users. By utilizing existing stainless steel casting techniques, a type 150QJS20 multistage deep-well pump was developed. Four kinds of techniques used in the development process are as follows:(1)the guide vane was cast by using outward rather than inward flanging technique to overcome the difficulty in cleaning sand from castings;(2)the inflow diffuser was adopted in this design to reduce manufacturing cost and shorten the axial length of di-ffuser, and eventually to improve the pump operation reliability;(3)tie-bolts are used to assemble the pump, and connection between stages is realized by spigots filled with O-shape seals, causing a more compact pump construction, convenient transportation and easy maintenance;(4)major accessories are interchangeable in the same series to reduce manufacturing cost. A prototype pump was built and its performance was measured, showing its efficiency being comparable with the international standard level and a greatly improved stage head. Compared with the traditional multistage deep-well pumps, the new type pump has a more compact configuration and lighter weight. Therefore the success in development of 150QJS20 pump can provide useful experience for development of other similar stainless steel casting pumps for mid- and high-end users.
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