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Plain Polder Large Vertical Structure Analysis and selection of pump units

D :2.0-3 .1 m,[link widoczny dla zalogowanych], supporting the electrical power N = 1000-3000kW more appropriate. Water pump impeller diameter should not exceed 4.0m, the overall stator as well. 3.2 The overall structure of the pump structure, selection of pumps used in Table 1, the impeller diameter D ≥ 2.0m,[link widoczny dla zalogowanych], pipe manufacturing, transportation, installation is more difficult, so the pipe-type case only for D ≤ 1.8m; shaft type for in D: 2.0 ~ 3.0m pump; masonry-type pumps suitable for all sizes, especially for D ≥ 4.0m of the large pumps. To ensure ease of installation, the shaft should be fixed flange and the impeller hub connection, but should pay particular attention to ensure that the shaft diameter under the water pump shaft flange socket concentric with the vertical adjustment of the stator is completed, the installation of the shaft can not be suspended, must take the stator and hanging under the frame (such as 2.8 pass away Dl | _-7.0 pump motor with rDI_325/56--- '40) even need to take the guide vane hanging body (such as ZL13.5-- 8 pump motor with variable pole 1600/600) who can hang with the impeller shaft connection, and then reset the fixed components,[link widoczny dla zalogowanych], vertical concentric difficult to ensure. If the unit axis is not very long, pumps (including pipe-type) guide vane located a body should only guide bearing, and should adopt the care-tube water-lubricating bearings, lubrication to ensure water quality, flow and pressure. Should be based on impeller diameter (Table 3), is pumping its own particular characteristics of the requirements of the regulatory function of leaves reasonable choice of adjustment method (Table 4), should not blindly adjust the way a good use of functions. When asked if the short run the drainage pumping station, and operating costs compared to the dominant investment in equipment, even if the larger diameter impeller, still semi-regulation; while the annual number of hours of operation of irrigation pumping station,[link widoczny dla zalogowanych], for the realization of angle Economic camel trip, should be less than the motor shaft under the frame aperture and the diameter of the Mouth of Waterloo, or install using base regulation impeller. Table 3, adjusted by way of the pump impeller diameter, impeller diameter used (m) 0.3 ~ 0.850.87 a I. 25I. 54 A I2.0 ~ 3. I4. O stands for a full adjustment of 5.7 semi-hydraulic regulating non-stop non-stop full-regulating mechanical adjustment of 3.3 full-open type electrical motor structure used natural ventilation should be eliminated, the original pumping station using this ventilation can be updated transformation of the motor when the elevation layer (layer of the original motor is not moving), located in the old and new Stories in the motor air duct, air duct fan to pull air into ventilation. If possible, the new air cooler pump motor should be closed by ventilation, to improve the cleanliness of the motor, reducing the workload of overhaul cleaning oily dirt to extend the overhaul period, save repair costs. Table 4 Characteristics of selected pump impeller blade diameter adjustment means (m) 0. g7-1.251.54 ~ 1.82. O-3. I half-regulating A1A1 + AI + A2 hydraulic stop all regulation regulating non-stop all AI + B2 + c2, A2 + c2 mechanical non-stop all regulation A1 +, A2A】 + + cl, A2 + c1 linked to: 1. Annual operation time is short; BI. Straight pipe ball} c1. Pump head lower; A2, asked in a long run;. Glance siphon water;. The higher the pump head should be integral stator, stator diameter should not be too large. Thrust bearing load rate should not exceed 0.8, often occurs Burning Thrust designed or modified motor, you can consider greater flexibility in capacity metal plastic tile,[link widoczny dla zalogowanych], which bearing in Jiangsu Province, the fourth pumping station Jiangdu 3000kW successful application of vertical synchronous motor. Net head high, with straight pipe water (shoot the door or gate fast drying) pumping station, electrical braking system should be set; and siphon the water by vacuum drying damage Yan low lift pump station and net other pumps station without setting the brake system. The unit installation, maintenance, start easy, 500kW should be set above the top of the motor vehicle equipment, 1600kW motor should be set above the hydraulic load shedding equipment. I North Water Transfer, etc. References. Large vertical pump bearing oil bearing improved water application. Fluid Machinery, 2000 ~ 28 (I) 2 North Water Transfer. All the economic angle regulation of pump station operation. Pump technology. 1993 (4): 25 ~ 283 Huang Haitian, agents Army. Second Point Thrust tile Siyang high temperature causes and treatment. ELECTRICAL ENGINEERING, 1997 (3) :17-204 DU Gang thumb. Large hydraulic pump unit of load shedding equipment. Pump Technology, 1988 (3) :54-56 Author: North Water Transfer, male, 37 years old, master. Associate Professor, fluid machinery and engineering hardware disabilities tutor. Pump House, is mainly engaged in the device structure, of Mi and applied research and teaching. Zang four provincial department level, municipal equipment 5. More than 50 published articles. Address: 2250o9 Yangzhou University, Yangzhou, Jiangsu Institute of Water Conservancy and Hydropower Department.

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