Area of u200bu200binlet and outlet flow passage of centrifugal pump impeller

u003cpu003eDiscussion on the area ratio of the inlet and outlet flow passages of the centrifugal pump impeller: Through the statistical results of real pumps, it is proved that different specific speeds correspond to different area ratios, thereby expanding the application of area ratios. The statistical law of centrifugal pump impeller blade passage area ratio ratio speed Introduction The entry and exit area ratio of the impeller passage described in this article is different from the effective area ratio of the general concept impeller passage entrance and exit. u003c/pu003eu003cpu003eThe latter is the effective area ratio of the inlet and outlet flow passages between the two blades of the impeller, and what this article is talking about is the sum of the effective cross-sectional area of u200bu200bthe suction inlet of the impeller and the effective area of u200bu200bthe outlet of the flow passage between the two blades of the impeller. One is to control the degree of diffusion of the impeller channel, and the other is to control the entry and exit area of u200bu200bthe impeller channel with different specific speeds, which is also an important criterion for testing whether the impeller hydraulic design is reasonable. A good hydraulic model can be designed by selecting the above reasonable parameters. However, when the number of blades is one, the single (double) runner impeller design is not the case, because the single (double) runner design is to design the runner first, that is Determine the relationship between the effective area of u200bu200bthe runner inlet and outlet. So far, the author has not seen the theoretical research report on the ratio of the sum of the cross-sectional area of u200bu200bthe suction of the centrifugal pump impeller and the effective area of u200bu200bthe flow passage between the blades. Therefore, it is hoped that the discussion of the area ratio of the inlet and outlet flow passages of the centrifugal pump impeller in this article will be enlightening to those engaged in fluid machinery design. Hereinafter, the area ratio of the inlet and outlet flow passage of the centrifugal pump impeller is referred to as the leaf passage area ratio. The expression of the derivation of the relationship between the area ratio of the blade passage and the number of specific revolutions The expression of the ratio of the blade passage area In the formula two, the effective area of u200bu200bthe impeller inlet is jD, the diameter of the impeller inlet is equal to the diameter of the impeller, the outlet of the impeller is effective The sum of the area, the number of blades, the effective width of the two blades, the pseudo-axial diagram, the effective width of the blades, the ratio of the sky to the coefficient, and the symbol in the equation are shown in the figure. The velocity relationship between the inlet and outlet of the leaf passage is used by the fluid continuity equation. The rabbit literature shows that the relative movement in the impeller can be considered steady regardless of the number of blades. Therefore, the Yao speed here is also the relative speed, that is, the two beggars used to beg for the two are usually seen as one return to two one and two one. The above reference value is related to the specific speed, which means that the leaf path area ratio is related to the specific speed. , And different specific revolutions correspond to different but the value is a range value, and the range is very large. Even so, it will not affect our determination of the value. A large number of centrifugal pump theories are based on theoretical calculations and practical experience coefficients. Here the author performs one-to-many statistics on a centrifugal pump impeller with high efficiency according to the order of specific revolutions, that is, a same specific revolution corresponds to different types of centrifugal pumps. The statistical results found that the same, the corresponding value of the relative speed of the geometric parameters of the impeller is determined by the speed triangle. Since flying is the average speed, Yao is not the circumferential speed at the outer diameter of the impeller. Instead, the circumferential speed at the effective width 2/point between the two blades in the plan view is recognized as shown in the figure. The relationship between the velocity and the circumferential speed is the reaction potential coefficient. The generation of the clan () Shi Deji Eryi Yaojiang () the generation of Erqiao, one recognizes the prisoner and recognizes the seal, so the relationship between the import diameter 0D and the import speed is called by Er Tian Zhao Ding Wan Yuao: Er Ting . The cylinder is also determined by the ratio of the area of u200bu200bthe leaf passage between the two powders and the two powders. The generation of people () the two one heart spear 2 Zhongshi captures two when two hours two, so Tian Yifan, the relationship between the pressure and the graph value in the spear blade Recently, take the average value after the last as shown in the chart. When you print, the ratio of two to one, that is, the specific speed increases, and the ratio of the leaf path area will increase, and the curve with and is smoother, again indicating the leaf path area The ratio is related to the specific revolution. The relationship between the application value of the blade passage area ratio and the geometric parameters of the impeller design a low ratio centrifugal pump impeller. When choosing a reasonable impeller inlet diameter and choosing a blade wrap angle close to the mid-to-high specific speed, the value should tend to a low ratio value. (1) Increase the blade wrap angle, that is, increase to increase the value and reduce the value to the desired value. Of course, the blade wrap angle is not as large as possible. When the blade wrap angle is 21, the pump performance is more ideal. (2). Increasing the width of the impeller outlet also increases the value and reduces the value to the desired value. Of course, the value cannot be increased indefinitely. If the value is too large, a Q curve will appear downward. The end face of the shaft may not be strictly perpendicular to its axis. For pump units with intermediate bearings, the coaxiality of the rotating parts must be measured. Adjustment. The method is to first connect the water pump shaft and drive shaft. The lower guide bearing of the pump will not be installed temporarily. The stuffing box part of the upper guide bearing is sleeved on the water pump shaft and then hung under the pump coupling. The intermediate bearing and seat are preliminarily fixed with a dial indicator. Measure the swing value of the lower guide journal of the pump and the pump coupling, and calculate the direction and quantity of the coupling scraping or padding. After the treatment is completed, connect the coupling and perform swing measurement and adjustment until it is qualified.
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