150QJS20型精铸不锈钢深井泵的开发

精铸不锈钢井泵成本高,市场定位为中高端用户,在对耐腐蚀、耐磨及使用寿命较高要求的特定场合有着广泛的应用.为研制高端深井泵产品,在精铸不锈钢工艺的基础上,开发出150QJS20型多级深井泵.在研制过程中主要采用了4个方面的技术：首先,精铸不锈钢井泵导叶壳体的翻边采用向外翻边的方式,消除了向内翻边时存在的精铸过程清砂困难;其次,泵的导叶采用了圆周弯扭式的径向导叶,比传统的铸造工艺中采用的空间更节约材料,也缩短了轴向长度,提高了运行可靠性;第三,泵体结构采用拉杆连接,级与级之间采用止口连接,由密封圈进行密封,整体外观更加紧凑,运输和检修更为简便;第四,主要配件通用,保证了系列产品零件的互换性,减轻生产加工成本.通过进行样机试制和试验表明150QJS20泵效率接近国标,但单级扬程显著增加,相比传统的空间导叶式多级井泵,其结构更紧凑轻巧.通过150QJS20多级深井泵的研制,对发展中高端井泵产品提供了一定的参考.

Development of 150QJS20 stainless steel casting multistage deep-well pump

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 type150QJS20 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 wasmeasured,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 of150QJS20 pump can provide useful experience for development of other similar stainless steel casting pumps for mid-and high-end users.