Water pump selection method for low-lift pump unit based on impeller nominal average flow speed

A technology of average flow rate, low lift pump, applied to the components of pumping device for elastic fluid, pump device, axial flow pump, etc. Energy performance and cavitation performance, the effect of reducing the head loss of the flow channel

Active Publication Date: 2015-10-21
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Judging from the hydraulic performance of low-lift pumps that have been developed and applied, the hydraulic performance of low specific speed pumps is more excellent, and it is difficult to select a satisfactory pump model for pumping stations with a lift lower than 3m.

Method used

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  • Water pump selection method for low-lift pump unit based on impeller nominal average flow speed
  • Water pump selection method for low-lift pump unit based on impeller nominal average flow speed
  • Water pump selection method for low-lift pump unit based on impeller nominal average flow speed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Example 1 A large-scale low-lift pump device adopts indirect transmission, and the design lift is H 设计 =2.5m, the highest lift H max =4.01m, design flow Q 设计 =33.5m 3 / s. The steps of applying the present invention to carry out water pump type selection are as follows:

[0080] 1. Select the commonly used low-lift water pump models whose head in the high-efficiency area is higher than the design head of the pump device in this embodiment, and their models are arranged in order of specific speed from small to large: TJ04-ZL-20 (i=1), TJ04-ZL -19(i=2), TJ04-ZL-06(i=3) and TJ04-ZL-07(i=4), Table 2 lists the saddle bottom of the saddle area of ​​these 4 water pump models when nD=435 Head (H 鞍底扬程 ) i And the head, flow rate, efficiency, critical cavitation margin and other main performance parameters of the optimal working point of each blade angle;

[0081] Table 2 The main performance parameters of the pump model whose head in the high-efficiency zone is higher than...

Embodiment 2

[0115] Example 2 A large-scale low-lift pump device adopts direct drive, and the design lift is H 设计 =3.75m, the highest lift H max =5.6m, design flow Q 设计 =33.5m 3 / s. The steps of applying the present invention to carry out water pump type selection are as follows:

[0116] 1. Select the commonly used low-lift water pump models whose head in the high-efficiency area is higher than the design head of the pump device in this embodiment, and their models are arranged in order of specific speed from small to large: TJ04-ZL-20 (i=1), TJ04-ZL -19 (i=2), TJ04-ZL-06 (i=3), Table 2 lists the saddle bottom head (H 鞍底扬程 ) i And the head, flow rate, efficiency, critical cavitation margin and other main performance parameters of the optimal working point of each blade angle;

[0117] 2. Give the initial value of the nominal mean velocity of the impeller:

[0118] 3. Carry out iterative calculations for the selected three water pump models in turn. The iterative calculation formu...

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PUM

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Abstract

The invention discloses a low-lift water pump selection method based on impeller nominal average flow speed. The method is used for water pump selection for a low-lift pump unit. The method can enable the hydraulic performance of a high-performance axial-flow pump and a tubular pump to be better, wherein the high performance axial-flow pump and the tubular pump are relatively low in specific speed. The method is more applicable to the low-lift pump unit, can comprehensively improve the hydraulic performance of the low-lift pump unit, and belongs to the technical field of hydraulic engineering pump stations. The method is characterized in that a concept of the impeller nominal average flow speed is introduced in the method; the pump selection is not restricted by the correspondence of the lift and the specific speed in a conventional water pump selection method for the low-lift pump unit, and the water pump selection for the low-lift pump unit is performed based on the adjustment of the impeller nominal average flow speed; and the diameter of a water pump impeller is properly increased and the water pump rotating speed is properly reduced, the lift and the critical cavitation allowance of a water pump high-efficiency zone are reduced, the head loss of a flow channel is reduced, and the hydraulic performance of the low-lift pump unit can be comprehensively improved. The low-lift water pump selection method can substantially improve the hydraulic performance of the large low-lift pump unit, and plays an important role in guaranteeing the stability and high operation efficiency for a low-lift pump station.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering pumping stations, in particular to a pump type selection method for a low-lift pump device based on the nominal average flow velocity of the impeller, which is used for the type selection of water pumps in large and medium-sized low-lift pumping stations, and can enable high-performance pumps with low specific speeds The water pump can be better and more suitable for low-lift pump devices, and achieve the goal of maximizing the hydraulic performance of low-lift pump stations. Background technique [0002] Large and medium-sized low-head pumping stations are widely used in many fields that have a significant impact on my country's social and economic development, such as water resource allocation, agricultural irrigation and drainage, water environment management, and urban drainage. Axial flow pumps and guide vane mixed flow pumps are the core of low-head pump installations, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D3/00F04D11/00F04D29/18F04D13/06
Inventor 陆林广陆伟刚徐磊练远洋施克鑫王海李亚楠
Owner YANGZHOU UNIV
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