Five working condition point design method of impeller of non-overloading centrifugal pump
A centrifugal pump impeller and working point technology, which is applied to parts, pumps, pump components, etc. of pumping devices for elastic fluids, can solve the problems of not being able to know and ensure the performance of other working points, and achieve consistency sexual effect
Inactive Publication Date: 2014-07-30
JIANGSU UNIV
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[0012] The patent number is 200410014937.0, and the patent titled "a low specific speed centrifugal pump impeller design method" proposes: when designing the impeller of the centrifugal pump, the geometric parameters of the impeller and the performance parameters of the design working point of the pump are used by several The new relational formulas are connected together to achieve the design effect of the design working condition of the pump, that is, the working condition of the flow head and the coincidence of the working condition of the highest efficiency point and the working condition of the maximum power point, but the determination of the geometric parameters of the impeller of the centrifugal pump is still as above Like the speed coefficient method, it is based on an optimal efficiency operating point, and can only guarantee the performance of this optimal efficiency operating point, and it is impossible to know how it can guarantee the performance of other operating points.
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[0068] The performance parameters of the five working condition points of the centrifugal pump are: the first working condition point, H 1 = 240 meters; the second operating point, Q 2 = 25.5 meters 3 / hour, H 2 = 230 meters; the third operating point, Q 3 = 51 meters 3 / hour, H 3 =220 meters; the fourth operating point (optimum efficiency operating point), Q BEP = 85 meters 3 / hour, H BEP = 180 meters; the fifth operating point, Q 5 = 127.5 meters 3 / hour, H=25 meters;
[0069] The geometric parameters of the impeller are calculated by the above equation relationship: the diameter of the impeller outlet D 2 = m, blade outlet placement angle β 2 =17 degrees; number of blades=5 pieces; blade wrap angle=153 degrees. See image 3 It is the actual performance curve of the centrifugal pump in the embodiment of the present invention. Its flow (Q)-shaft power (N) curve has a maximum value, which has typical characteristics of a non-overloaded centrifugal pump. At the sam...
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The invention provides a design method of an impeller of a non-overloading centrifugal pump, which meet the requirements for five working condition points. The design method is characterized in that the geometric parameters of the impeller of a centrifugal pump and the performance parameters of different working condition points are combined together when the impeller of the centrifugal pump is designed, therefore not only can the requirements for non-overloading of power be met, but also the effect of coinciding a design performance curve of the centrifugal pump with a required performance curve can be achieved. The impeller designed by adopting the method can be regulated in the geometric parameters, therefore the purpose that the performance of the centrifugal pump meets the requirements for the five working condition points is achieved; and in addition, the design method provided by the invention can ensure the consistency of the actual motion performance curve of the centrifugal pump with the required performance curve and is especially suitable for designing the impeller of the non-overloading centrifugal pump which has strict requirements for performance.
Description
technical field [0001] The invention relates to a design method of five working condition points for an impeller of a non-overloaded centrifugal pump, which can be used not only for the impeller design of the centrifugal pump low specific speed working condition, but also for the impeller design of the centrifugal pump high specific rotational speed working condition, and is especially suitable for It is suitable for the impeller design with strict requirements on the performance parameters of non-overload centrifugal pumps. Background technique [0002] At present, the known centrifugal pump impeller design adopts the speed coefficient method. This method is to design the geometric parameters of the impeller according to a certain working point proposed in the application. The formula for determining the main geometric parameters of the impeller is as follows: [0003] D 2 = K D ...
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Inventor 袁寿其朱荣生付强王秀礼
Owner JIANGSU UNIV