CN104818699B - A kind of closed intake pool 1/4 elliptic cone taper platform vortex reducing means and method thereof - Google Patents
A kind of closed intake pool 1/4 elliptic cone taper platform vortex reducing means and method thereof Download PDFInfo
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Abstract
Description
技术领域technical field
本发明涉及一种消涡装置，尤其涉及一种封闭式进水池1/4椭圆锥面锥形台消涡装置及其方法，属于封闭式进水池设计技术领域。The invention relates to a vortex elimination device, in particular to a 1/4 ellipse conical table vortex elimination device for a closed water inlet pool and a method thereof, belonging to the technical field of design of a closed water inlet pool.
背景技术Background technique
国内外开敞式进水池的研究成果众多，在此基础上对箱涵式进水流道的研究成为近年研究的主流，然而对于封闭式进水池的研究较少。There are many research results on open intake tanks at home and abroad. On this basis, the research on box culvert intake channels has become the mainstream of research in recent years, but there are few studies on closed intake tanks.
由于水泵进水池布置了吸水管，使进水池和吸水管内部流态极为复杂，进水池内常出现水面涡和附底涡两种旋涡，它们是影响水泵装置稳定运行的重要因素。其中开敞式进水池常出现的水面涡易引起水面处空气吸入，诱发空化空蚀，而封闭式进水池内附壁涡在底部形成低压区，易产生空化涡带，导致泵及管道内周期性的振动，严重影响水泵性能和寿命。Due to the arrangement of the suction pipe in the water pump inlet pool, the internal flow state of the water inlet pool and the water suction pipe is extremely complicated. Two kinds of vortices, the water surface vortex and the attached bottom vortex, often appear in the water inlet pool, which are important factors affecting the stable operation of the pump device. Among them, the water surface vortex that often appears in the open water inlet pool can easily cause air inhalation at the water surface and induce cavitation cavitation, while the wall-attached vortex in the closed water inlet pool forms a low-pressure area at the bottom, which is easy to generate cavitation vortex belts, causing pumps and pipelines to be damaged. The periodic vibration in the pump seriously affects the performance and life of the pump.
进水池是泵站最主要的进水过流部件，直接影响到水泵的效率及整个泵站的运行效果。为改善封闭式进水池流态，目前采用的消涡方法有：隔板、压水板和导流墩等。但是目前的消涡方法难以彻底的消除进水池池底附底涡。The water inlet tank is the most important water flow part of the pumping station, which directly affects the efficiency of the pump and the operation effect of the entire pumping station. In order to improve the flow state of the closed inlet pool, the vortex elimination methods currently used include: partitions, pressure water plates, and diversion piers. However, the current vortex elimination method is difficult to completely eliminate the attached bottom vortex at the bottom of the inlet pool.
发明内容Contents of the invention
本发明就是针对上述现有技术的不足，提供一种能有效改善封闭式进水池不良流态、提高泵站效率、消除池底及其附近区域较大流速剪切梯度、达到消除池底附底涡且不诱发新的回流区或旋涡的封闭式进水池1/4椭圆锥面锥形台消涡装置及其方法。The present invention aims at the deficiencies of the above-mentioned prior art, and provides a method that can effectively improve the bad flow state of the closed water inlet pool, improve the efficiency of the pumping station, eliminate the large flow velocity shear gradient at the bottom of the pool and its surrounding areas, and achieve the elimination of the attachment to the bottom of the pool. A closed 1/4 elliptical conical surface conical platform vortex elimination device and method thereof for a closed water inlet pool without vortex and no new recirculation zone or vortex induced.
本发明的技术方案是，一种封闭式进水池1/4椭圆锥面锥形台消涡装置，包括封闭式进水池及封闭式进水池内安装的水泵和喇叭管口，喇叭管口的正下方的进水池底板上设置的导水锥，其特征是，所述导水锥为1/4椭圆锥面锥形台，1/4椭圆锥面锥形台距离封闭式进水池后壁距离与喇叭管口的直径相等，1/4椭圆锥面锥形台的高度为水泵喇叭管口直径的2/5，1/4椭圆锥面锥形台的锥底径与水泵喇叭管口直径相等，1/4椭圆锥面锥形台的锥顶径为水泵喇叭管口直径的7/25，1/4椭圆锥面锥形台的椭圆锥面截面为1/4椭圆锥面，1/4椭圆锥面的方程式为：式中：x为椭圆的短轴，y为椭圆的长轴。The technical solution of the present invention is a 1/4 elliptical conical surface vortex elimination device for a closed water inlet pool, including a closed water inlet pool and a water pump installed in the closed water inlet pool and a trumpet nozzle, and the front of the trumpet nozzle The water guide cone arranged on the bottom plate of the water inlet pool below is characterized in that the water guide cone is a 1/4 elliptical conical surface conical platform, and the distance between the 1/4 elliptical conical surface conical platform and the rear wall of the closed water inlet pool is equal to The diameters of the horn nozzles are equal, the height of the 1/4 elliptical cone is 2/5 of the diameter of the pump horn, and the bottom diameter of the 1/4 elliptical cone is equal to the diameter of the water pump horn. The cone top diameter of the 1/4 elliptical cone surface is 7/25 of the diameter of the water pump horn, and the elliptical cone surface section of the 1/4 elliptical cone surface is 1/4 elliptical cone surface, 1/4 ellipse The equation for the cone is: Where: x is the minor axis of the ellipse, and y is the major axis of the ellipse.
所述1/4椭圆锥面锥形台由钢材料或混凝土制成。The 1/4 ellipse cone is made of steel or concrete.
所述1/4椭圆锥面锥形台为壳体结构，1/4椭圆锥面锥形台底的周围通过螺栓安装在封闭式进水池底板上。The 1/4 ellipse conical surface conical platform is a shell structure, and the periphery of the 1/4 elliptical conical surface conical platform bottom is installed on the bottom plate of the closed water inlet pool through bolts.
所述1/4椭圆锥面锥形台为混凝土结构，1/4椭圆锥面锥形台与封闭式进水池底板浇筑成整体。The 1/4 ellipse conical surface conical platform is a concrete structure, and the 1/4 elliptical conical surface conical platform and the bottom plate of the closed water inlet pool are poured into a whole.
一种封闭式进水池1/4椭圆锥面锥形台消涡方法，其特征是，在封闭式进水池底板上设置1/4椭圆锥面锥形台，1/4椭圆锥面锥形台在安装在封闭式进水池内的水泵喇叭管口正下方，1/4椭圆锥面锥形台的中心线与水泵轴心线重合，1/4椭圆锥面锥形台距离封闭式进水池后壁距离与喇叭管口的直径相等，1/4椭圆锥面锥形台的高度为水泵喇叭管口直径的2/5，1/4椭圆锥面锥形台的锥底径与水泵喇叭管口直径相等，1/4椭圆锥面锥形台的锥顶直径为水泵喇叭管口直径的7/25，1/4椭圆锥面锥形台的椭圆锥面截面为1/4椭圆锥面，1/4椭圆锥面的方程式为：式中：x为椭圆的短轴，y为椭圆的长轴。A vortex elimination method for a 1/4 elliptical conical surface conical platform of a closed water inlet pool, characterized in that a 1/4 elliptical conical surface conical platform and a 1/4 elliptical conical surface conical platform are set on the bottom plate of the closed water intake pool Directly below the trumpet nozzle of the water pump installed in the closed water inlet, the center line of the 1/4 elliptical conical table coincides with the axis line of the pump, and the distance between the 1/4 elliptical conical table and the closed water inlet The wall distance is equal to the diameter of the horn nozzle, the height of the 1/4 elliptical cone conical platform is 2/5 of the diameter of the pump horn nozzle, and the cone bottom diameter of the 1/4 elliptical cone conical platform is the same as the water pump horn nozzle The diameters are equal, the diameter of the cone top of the 1/4 elliptical cone is 7/25 of the diameter of the water pump horn, the cross section of the 1/4 elliptical cone is the 1/4 elliptical cone, 1 The equation of the /4 ellipse cone is: Where: x is the minor axis of the ellipse, and y is the major axis of the ellipse.
本发明结构合理简单、生产制造容易、使用方便，本发明的技术原理为：The present invention is reasonable and simple in structure, easy to manufacture, convenient to use, and the technical principle of the present invention is:
水流沿着1/4椭圆锥面锥形台规则的1/4椭圆锥面，从锥的周围平顺地进入封闭式进水池内的喇叭管口，有效改善水流流态及减少水力损失，确保水流流速均匀递增。The water flows along the regular 1/4 elliptical conical surface of the 1/4 elliptical conical surface, and smoothly enters the trumpet nozzle in the closed water inlet pool from around the cone, effectively improving the water flow pattern and reducing hydraulic loss, ensuring water flow The flow rate increases uniformly.
水泵喇叭管口下方的滞水区被1/4椭圆锥面锥形台所填补，避免封闭式进水池后壁处及喇叭管口下滞水区与流动水体相互摩擦碰撞而造成的流态紊乱和较大剪切速度梯度(即涡量)；1/4椭圆锥面锥形台消除了原有不良水流流态，使水流重新组合，以减小涡流强度及消除涡带，提高泵站效率。The stagnant water area below the bell nozzle of the water pump is filled by a 1/4 elliptical conical table, avoiding the flow disorder caused by friction and collision between the back wall of the closed water inlet pool and the stagnant water area under the bell nozzle and the flowing water body. Larger shear velocity gradient (ie vorticity); 1/4 elliptical conical surface and conical platform eliminates the original bad water flow pattern, recombines the water flow, reduces the vortex intensity and eliminates the vortex belt, and improves the efficiency of the pumping station.
基于1/4椭圆锥面锥形台消涡方法不仅可以明显改善喇叭管口下方水流不良流态，而且可以起到减小旋涡涡流强度，达到消除附底涡的作用。1/4椭圆锥面锥形台具有导流作用，水流从封闭式进水池底下方沿椭圆锥面平顺地进入喇叭管口，同时1/4椭圆锥面锥形台可有效填充喇叭口下方的滞水区，明显改善封闭式进水池喇叭管口下方流速分布，破坏旋涡。The vortex elimination method based on the 1/4 elliptical conical surface and conical platform can not only significantly improve the bad flow state of the water flow below the horn nozzle, but also reduce the vortex vortex intensity and achieve the effect of eliminating the bottom vortex. The 1/4 elliptical cone surface has a diversion effect, and the water flow enters the horn nozzle smoothly from the bottom of the closed water inlet pool along the elliptical cone surface. In the stagnant water area, the flow velocity distribution under the horn nozzle of the closed water inlet pool is obviously improved, and the vortex is destroyed.
通过整流和调整池底速度，使进入水泵及管道的水流断面流速趋于均匀。本发明应用于泵站建设与改造，提高泵站效率6％至10％，可发挥巨大的经济效益。By rectifying and adjusting the speed at the bottom of the pool, the cross-sectional flow velocity of the water entering the pump and pipeline tends to be uniform. The invention is applied to the construction and transformation of the pumping station, improves the efficiency of the pumping station by 6% to 10%, and can exert huge economic benefits.
基于1/4椭圆锥面锥形台消涡装置，通过引导水流沿规则椭圆锥面有序地进入喇叭管，并填补原水泵进水口下的滞水区，起到了稳定流态、消除附底涡、减小汽蚀的效果。1/4椭圆锥面锥形台结构简单、施工方便，可用模具实现成批生产。随着国家大中型泵站技术改造和南水北调东线工程的建设实施，共计有上百座泵站的进水流态需要改善，因此本发明的技术方案的应用和实施，对于水位变化幅度较大和喇叭管悬空高过高的泵站，安装1/4椭圆锥面锥形台的效果最为明显，这将会产生较大的经济价值和社会效益。可以用于设计院设计采用或者在工程改造中实施。Based on the 1/4 elliptical cone-shaped cone-shaped vortex elimination device, by guiding the water flow into the trumpet tube in an orderly manner along the regular elliptical cone surface, and filling the stagnant water area under the water inlet of the raw water pump, it stabilizes the flow state and eliminates bottom attachment. Vortex, reducing the effect of cavitation. The 1/4 ellipse conical table has a simple structure and convenient construction, and can be mass-produced with molds. With the technical transformation of national large and medium-sized pumping stations and the construction and implementation of the east route project of the South-to-North Water Diversion Project, there are a total of hundreds of pumping stations that need to be improved. For pumping stations where the pipe suspension height is too high, the effect of installing a 1/4 elliptical conical platform is the most obvious, which will generate greater economic value and social benefits. It can be used in the design and adoption of design institutes or implemented in engineering transformation.
附图说明Description of drawings
图1是封闭式进水池的三维实体透视图。Fig. 1 is a three-dimensional solid perspective view of a closed water intake tank.
图2是本发明的1/4椭圆锥面锥形台防涡消涡锥三维实体图。Fig. 2 is a three-dimensional solid diagram of the anti-vortex and vortex-eliminating cone of the 1/4 elliptical conical surface conical platform of the present invention.
图中：1封闭式进水池、2 1/4椭圆锥面锥形台、3导水帽、4水泵、5喇叭管口、6 1/4椭圆锥面锥形台断面。In the figure: 1 closed water inlet pool, 2 1/4 elliptical conical surface conical platform, 3 water guide cap, 4 water pump, 5 trumpet nozzle, 6 1/4 elliptical conical surface conical platform section.
具体实施方式detailed description
下面结合附图和附图说明对本发明作进一步说明。The present invention will be further described below in conjunction with the accompanying drawings and description of the accompanying drawings.
一种封闭式进水池1/4椭圆锥面锥形台消涡装置，包括封闭式进水池1及封闭式进水池1内安装的水泵4和喇叭管口5，喇叭管口5的正下方的进水池底板上设置的导水锥，本发明中，导水锥为1/4椭圆锥面锥形台2，1/4椭圆锥面锥形台2距离封闭式进水池1后壁距离与喇叭管口5的直径相等，1/4椭圆锥面锥形台2的高度为水泵4喇叭管口5直径的2/5，1/4椭圆锥面锥形台2的锥底径与水泵4喇叭管口5直径相等，1/4椭圆锥面锥形台2的锥顶径为水泵4喇叭管口5直径的7/25，1/4椭圆锥面锥形台2的椭圆锥面截面为1/4椭圆锥面，1/4椭圆锥面的方程式为：式中：x为椭圆的短轴，y为椭圆的长轴。其中，1/4椭圆锥面锥形台2由钢材料或混凝土制成。A closed 1/4 elliptical conical conical platform vortex elimination device for a closed water inlet pool, including a closed water inlet pool 1 and a water pump 4 installed in the closed water inlet pool 1, a horn nozzle 5, and a tube directly below the horn nozzle 5 The water guide cone arranged on the bottom plate of the water inlet pool, in the present invention, the water guide cone is a 1/4 elliptical conical surface conical platform 2, and the distance between the 1/4 elliptical conical surface conical platform 2 and the distance from the rear wall of the closed water inlet pool 1 is the same as that of the horn The diameters of nozzle 5 are equal, and the height of 1/4 elliptical conical surface conical platform 2 is 2/5 of the diameter of water pump 4 trumpet nozzle 5, and the cone bottom diameter of 1/4 elliptical conical surface conical platform 2 is the same as that of water pump 4 trumpets. Nozzle 5 diameters are equal, and the conical top diameter of 1/4 ellipse conical surface conical platform 2 is 7/25 of the diameter of water pump 4 trumpet nozzle 5, and the elliptical conical section of 1/4 elliptical conical surface conical platform 2 is 1 /4 ellipse cone, the equation of 1/4 ellipse cone is: Where: x is the minor axis of the ellipse, and y is the major axis of the ellipse. Wherein, the 1/4 ellipse conical surface conical platform 2 is made of steel material or concrete.
对于1/4椭圆锥面锥形台2与封闭式进水池1底板的连接方式，可以使用两种：(1)所述1/4椭圆锥面锥形台2为壳体结构，1/4椭圆锥面锥形台2底的周围通过螺栓安装在封闭式进水池1底板上。(2)所述1/4椭圆锥面锥形台2为混凝土结构，1/4椭圆锥面锥形台2与封闭式进水池1底板浇筑成整体。For the connection of the 1/4 elliptical conical surface conical platform 2 and the bottom plate of the closed water inlet pool 1, two types can be used: (1) the 1/4 elliptical conical surface conical platform 2 is a shell structure, and 1/4 Around the bottom of the elliptical conical platform 2 is installed on the bottom plate of the closed water inlet pool 1 by bolts. (2) The 1/4 ellipse conical surface conical platform 2 is a concrete structure, and the 1/4 elliptical conical surface conical platform 2 and the bottom plate of the closed water inlet pool 1 are poured into a whole.
一种封闭式进水池1/4椭圆锥面锥形台消涡方法，该方法是，在封闭式进水池1底板上设置1/4椭圆锥面锥形台2，1/4椭圆锥面锥形台2在安装在封闭式进水池内的水泵4喇叭管口5正下方，1/4椭圆锥面锥形台2的中心线与水泵4轴心线重合，1/4椭圆锥面锥形台2距离封闭式进水池1后壁距离与喇叭管口5的直径相等，1/4椭圆锥面锥形台2的高度为水泵4喇叭管口5直径的2/5，1/4椭圆锥面锥形台2的锥底径与水泵4喇叭管口5直径相等，1/4椭圆锥面锥形台2的锥顶直径为水泵4喇叭管口5直径的7/25，1/4椭圆锥面锥形台2的椭圆锥面截面为1/4椭圆锥面，1/4椭圆锥面的方程式为：式中：x为椭圆的短轴，y为椭圆的长轴。A vortex elimination method for a 1/4 elliptical conical surface conical platform of a closed water inlet pool. The shaped platform 2 is directly below the bell nozzle 5 of the water pump 4 installed in the closed water inlet pool. The center line of the 1/4 elliptical conical surface conical platform 2 coincides with the axis line of the water pump 4, and the 1/4 elliptical conical surface is conical. The distance between platform 2 and the rear wall of closed water inlet pool 1 is equal to the diameter of the horn nozzle 5, and the height of the 1/4 elliptical conical surface conical platform 2 is 2/5 of the diameter of the water pump 4 horn nozzle 5, and the 1/4 elliptical cone The diameter of the bottom of the conical table 2 is equal to the diameter of the nozzle 5 of the water pump 4, and the diameter of the cone top of the 1/4 elliptical conical table 2 is 7/25 of the diameter of the nozzle 5 of the water pump 4, 1/4 elliptical The cross-section of the elliptical conical surface of the conical surface conical pedestal 2 is a 1/4 elliptical conical surface, and the equation of the 1/4 elliptical conical surface is: Where: x is the minor axis of the ellipse, and y is the major axis of the ellipse.
本发明中，可将1/4椭圆锥面锥形台2采用预制方式先浇制好，再将其设置在封闭式进水池1相应位置，也可在封闭式进水池1内采用混凝土现浇。1/4椭圆锥面锥形台2必须固定在封闭式进水池1的底板上，防止因水泵4吸力较大导致1/4椭圆锥面锥形台2发生移位，固定方法可将锥体与底板一起浇筑，对于分开浇筑的，可用钢钻在封闭式进水池1底板打孔，通过预埋螺丝从而固定1/4椭圆锥面锥形台2。操作过程应确保1/4椭圆锥面锥形台2的锥面平滑，避免不必要的阻力损失。In the present invention, the 1/4 elliptical conical surface conical platform 2 can be prefabricated first, and then placed in the corresponding position of the closed water inlet pool 1, or concrete can be cast in-situ in the closed water inlet pool 1 . The 1/4 elliptical conical surface conical platform 2 must be fixed on the bottom plate of the closed water inlet pool 1 to prevent the displacement of the 1/4 elliptical conical surface conical platform 2 due to the strong suction of the water pump 4. The fixing method can be the cone It is poured together with the bottom plate, and for separate pouring, a steel drill can be used to drill holes in the bottom plate of the closed water inlet pool 1, and the 1/4 elliptical conical surface conical platform 2 is fixed by pre-embedded screws. During the operation, it should be ensured that the conical surface of the 1/4 elliptical conical pedestal 2 is smooth, so as to avoid unnecessary loss of resistance.
我们可以设定，X为1/4椭圆锥面锥形台中心到封闭式进水池1后壁的距离；D上为1/4椭圆锥面锥形台的上端面直径；D下为1/4椭圆锥面锥形台的底部直径；H为1/4椭圆锥面锥形台的高度；D0为喇叭管口直径。We can set that X is the distance from the center of the 1/4 elliptical cone to the rear wall of the closed water inlet pool 1; D is the diameter of the upper end of the 1/4 elliptical cone; D is 1/ 4 Diameter of the bottom of the elliptical cone; H is the height of the 1/4 elliptical cone; D 0 is the diameter of the horn.
1/4椭圆锥面锥形台2的参数：距离封闭式进水池1后壁的距离X＝1.0D0，1/4椭圆锥面锥形台的消涡锥高度H＝0.4D0，1/4椭圆锥面锥形台的锥底径D下＝1.0D0，1/4椭圆锥面锥形台的锥顶径D上＝0.28D0。Parameters of 1/4 elliptical conical surface conical pedestal 2: distance X=1.0D 0 from the back wall of closed water inlet pool 1, vortex elimination cone height of 1/4 elliptical conical surface conical pedestal H=0.4D 0 , 1 The bottom diameter D of the truncated cone of the /4 elliptical cone surface = 1.0D 0 , and the top diameter D of the truncated cone of the 1/4 elliptical cone surface = 0.28D 0 .
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| CN106759665B (en) * | 2016-11-30 | 2023-04-07 | 华北水利水电大学 | Combined hydraulic rectifying device under ultralow water level of pump station water inlet pool |
| CN107489655B (en) * | 2017-09-29 | 2019-06-07 | 扬州大学 | Pump installation bell-shaped inflow passage with the suitable flowing plate of activity |
| CN107938758B (en) * | 2017-11-29 | 2018-11-20 | 扬州大学 | A kind of water inlet structure control whirlpool device based on fermat spiral |
| CN109469155B (en) * | 2018-11-15 | 2020-07-03 | 扬州大学 | A vortex control device for water inlet structure based on equal difference variable diameter arc line |
| CN110486922B (en) * | 2019-07-29 | 2024-02-06 | 西安建筑科技大学 | Round table-shaped guide plate device for vortex elimination in jet flow limited space |
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