泵站蜗壳形流道采用活动导流盖断流的应用研究
发布时间：2018-10-15 10:44
【摘要】：低扬程泵站的泵装置效率问题一直是研究泵系统的重点和难点,本文从低扬程泵站的进、出水流道及断流装置入手,采用蜗壳形进、出水流道,并结合活动导流盖断流结构。通过理论分析与现场实施,证明在低扬程泵站中采用此设计是可行的,值得推广和应用。 在低扬程泵站中采用新型蜗壳形进、出水流道,其原理在于：新型蜗壳形进水流道在保持流道宽度不变的条件下,将蜗壳段弧线曲率半径适当加大,可加大吸水喇叭管直径,减小蜗壳断面及喇叭管下柱形断面流速,改善水泵进口水流流态,减少水力损失；新型蜗壳形出水流道在保持流道宽度不变的条件下,将蜗壳段弧线曲率半径适当加大,可加大扩散管直径,减小扩散管出口及蜗壳断面流速,减少水力损失。严登丰教授通过模型试验,得出在相同扬程条件下,采用优秀水力模型、正常流道宽度、净扬程5m左右时,D=0.3m模型泵装置效率可提高3～5%,最高可达到79～80%,接近或达到平直流动的贯流泵装置理想的效率指标。 相对于传统断流装置中存在的开启时水头损失大、闭合时撞击力大及开启速度慢等问题,结合低扬程及特低扬程泵站采用新型蜗壳形进、出水流道,加上出水流道可配套采用新型断流装置——活动导流盖,具有重要创新意义。活动导流盖断流结构具体结构为：于泵出口“倒置喇叭管”与泵站密封盖板之间设置容重接近水容重的活动导流盖,水泵正常运行时,导流盖因动水压力作用向上浮起,不产生附加水力损失；停泵后因自重力及喇叭管口水体吸力而下落并密闭止水。与现行常用断流装置相比,既具有节能意义,并可进一步减少、简化泵站附属设备,节约工程投资。 通过对新型活动导流盖开启及关闭的一系列力学分析,结合句容市发区焦家排涝泵站,通过现场实施,验证蜗壳形进、出水流道配套活动导流盖断流装置的新型结构在低扬程泵站中可安全、稳定运行。
[Abstract]:The efficiency of pump device in low head pump station is always the key and difficult point in the research of pump system. This paper starts with the inlet, outlet passage and cut-off device of low head pump station, adopts the volute inlet and outlet passage, and combines with the disconnection structure of the movable diversion cover. Through theoretical analysis and field implementation, it is proved that it is feasible to adopt this design in low head pumping station, and it is worth popularizing and applying. A new type of volute inlet and outlet passage is adopted in the low lift pump station. The principle lies in that the diameter of the water absorption horn pipe can be increased by increasing the curvature radius of the spiral section of the volute section properly under the condition of keeping the width of the flow passage constant. Reducing the flow velocity of the volute section and the cylindrical section under the horn tube, improving the inlet water flow state of the pump and reducing the hydraulic loss; while keeping the width of the flow passage constant, the curvature radius of the spiral section of the volute can be appropriately increased. It can increase the diameter of the diffuser tube, reduce the velocity of the outlet of the diffuser tube and the cross section of the volute, and reduce the hydraulic loss. Professor Yan Dengfeng through the model test, under the same lift condition, adopts the excellent hydraulic model, the normal flow channel width, When the net lift is about 5 m, the efficiency of the DX 0.3m model pump device can be increased by 3 / 5, and the maximum can reach 79 / 80, which is close to or up to the ideal efficiency index of the straight flow tubular pump device. Compared with the problems such as large head loss in opening, large impact force and slow opening speed in closing, the new type of volute inlet and outlet passage are adopted in combination with low head and ultra-low head pumping station. It is of great significance to adopt a new type of cutoff device, the movable guided-cap, in the outlet channel. The concrete structure of the cutoff structure of the movable diversion cover is as follows: between the pump outlet "inverted horn pipe" and the sealing cover plate of the pump station, a movable diversion cover with a bulk density close to the water bulk density is arranged. When the pump is in normal operation, the diversion cover will float upward due to the action of dynamic water pressure. No additional hydraulic loss; after pump shutdown due to gravity and the water suction of the horn nozzle fall and seal the water. Compared with the commonly used cutoff device, it has the significance of saving energy, further reducing the auxiliary equipment of pump station and saving the project investment. Through a series of mechanical analysis of the opening and closing of the new type of movable diversion cover, combined with the Jiaojia drainage pump station in the development area of Jurong City, through the on-site implementation, the volute shape is verified. The new structure of the disconnection device of the outlet channel is safe and stable in the low head pump station.
【学位授予单位】：扬州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV675;TV136.2
本文编号：2272295
[Abstract]:The efficiency of pump device in low head pump station is always the key and difficult point in the research of pump system. This paper starts with the inlet, outlet passage and cut-off device of low head pump station, adopts the volute inlet and outlet passage, and combines with the disconnection structure of the movable diversion cover. Through theoretical analysis and field implementation, it is proved that it is feasible to adopt this design in low head pumping station, and it is worth popularizing and applying. A new type of volute inlet and outlet passage is adopted in the low lift pump station. The principle lies in that the diameter of the water absorption horn pipe can be increased by increasing the curvature radius of the spiral section of the volute section properly under the condition of keeping the width of the flow passage constant. Reducing the flow velocity of the volute section and the cylindrical section under the horn tube, improving the inlet water flow state of the pump and reducing the hydraulic loss; while keeping the width of the flow passage constant, the curvature radius of the spiral section of the volute can be appropriately increased. It can increase the diameter of the diffuser tube, reduce the velocity of the outlet of the diffuser tube and the cross section of the volute, and reduce the hydraulic loss. Professor Yan Dengfeng through the model test, under the same lift condition, adopts the excellent hydraulic model, the normal flow channel width, When the net lift is about 5 m, the efficiency of the DX 0.3m model pump device can be increased by 3 / 5, and the maximum can reach 79 / 80, which is close to or up to the ideal efficiency index of the straight flow tubular pump device. Compared with the problems such as large head loss in opening, large impact force and slow opening speed in closing, the new type of volute inlet and outlet passage are adopted in combination with low head and ultra-low head pumping station. It is of great significance to adopt a new type of cutoff device, the movable guided-cap, in the outlet channel. The concrete structure of the cutoff structure of the movable diversion cover is as follows: between the pump outlet "inverted horn pipe" and the sealing cover plate of the pump station, a movable diversion cover with a bulk density close to the water bulk density is arranged. When the pump is in normal operation, the diversion cover will float upward due to the action of dynamic water pressure. No additional hydraulic loss; after pump shutdown due to gravity and the water suction of the horn nozzle fall and seal the water. Compared with the commonly used cutoff device, it has the significance of saving energy, further reducing the auxiliary equipment of pump station and saving the project investment. Through a series of mechanical analysis of the opening and closing of the new type of movable diversion cover, combined with the Jiaojia drainage pump station in the development area of Jurong City, through the on-site implementation, the volute shape is verified. The new structure of the disconnection device of the outlet channel is safe and stable in the low head pump station.
【学位授予单位】：扬州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV675;TV136.2
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