Method for deviation rectifying and vortex eliminating of water outlet flow channel of low lift pump station and application of method

A technology for low-lift pumps and flow channels, which is applied to parts, pumps, and pump components of pumping devices for elastic fluids, and can solve the problem of large differences in discharge flow, which affect the safe and stable operation of pump stations, and the flow of water in discharge channels. Unstable movement and other problems, to achieve the effect of eliminating vortex, reducing the loss of water head in the flow channel, and ensuring safe and stable operation

Pending Publication Date: 2019-04-16
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This flow state leads to a large difference in the flow rate of the left and right holes in the outlet channel, and causes the water flow in the outlet channel to be unstable, which seriously affects the safe and stable operation of the pumping station.

Method used

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  • Method for deviation rectifying and vortex eliminating of water outlet flow channel of low lift pump station and application of method
  • Method for deviation rectifying and vortex eliminating of water outlet flow channel of low lift pump station and application of method
  • Method for deviation rectifying and vortex eliminating of water outlet flow channel of low lift pump station and application of method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] A low-lift pumping station adopts an oblique pump device, the pumps are arranged obliquely, the inclination angle of the pump shaft is 20°, and the design flow rate of a single pump is 50m 3 / s, select the TJ04-ZL-20 water pump model tested on the same platform as the South-to-North Water Diversion pump model, and determine the pump impeller diameter D 0 It is 3.65m, the speed of the water pump is 107r / min, the water inlet channel is an inclined water inlet channel, and the water outlet channel is an inclined water outlet channel. The elevation view of the inclined pump device is as follows figure 1 As shown, from the inlet to the outlet of the pump device, there are inclined water inlet flow channel 1, water pump impeller 2, guide vane body 3 and inclined water outlet flow channel 4. The inclined water outlet channel 4 is divided into an inlet curved section 4a, a middle diffuser section 4b, and an outlet straight section 4c along the water flow direction, and a septu...

Embodiment 2

[0090] A large-scale low-lift pump station adopts a vertical pump device, and the design flow rate of a single pump is 33.5m 3 / s, select the TJ04-ZL-06 water pump model tested on the same platform as the water pump model of the South-to-North Water Diversion Project, the diameter of the pump impeller is D 0 The length is 3.15m, the speed of the water pump is 125r / min, the water inlet channel is an elbow-shaped water inlet channel, and the water outlet channel is a low hump-shaped outlet channel. like Figure 10 As shown, the vertical pump device includes an elbow-shaped water inlet channel 11 , a water pump impeller 12 , guide vanes 13 and a low-humped water outlet channel 14 from the inlet to the outlet. The low hump type outlet flow channel 14 is sequentially composed of an inlet curved section 14a, a middle diffuser section 14b, and an outlet straight section 14c from the inlet to the outlet, and an intermediate pier 17 is arranged in the middle of the outlet straight sec...

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Abstract

The invention discloses a method for deviation rectifying and vortex eliminating of a water outlet flow channel of a low lift pump station, and belongs to the technical field of hydraulic engineeringpump stations. The method is characterized by comprising the steps that the deviation rectifying and vortex eliminating of the water outlet flow channel are carried out based on the principle of reducing the inlet circulation of the water outlet flow channel of the low-lift pump station; m pieces of horizontal deflectors and n pieces of vertical deflectors are evenly arranged in a inlet curved segment, and the horizontal deflectors and the vertical deflectors perpendicularly intersect; the two ends of the horizontal deflectors are welded to left and right side walls, and the two ends of the vertical deflectors are welded to upper and lower side walls; the heads of the deflectors are 0.1-0.3 m away from the edge of a pump shaft, and the tail portions of the deflectors are located at the outlet section of the inlet curved segment; and a three-dimensional flow field numerical simulation method is used, the left and right hole drift coefficient lambda, the vortex volume V and the flow channel water head loss delta h are used as evaluation indexes to calculate the number of the horizontal deflectors and the vertical deflectors, and the purpose of deviation rectifying and vortex eliminating is achieved. The invention further discloses application of the method for deviation rectifying and vortex eliminating of an oblique type water outlet flow channel or a low hump-type water outletflow channel.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering pumping stations, and specifically relates to a method for correcting deflection and eliminating vortexes in the outlet channel of a low-lift pumping station and its application. This causes the instability of the flow state in the outlet channel. Background technique [0002] Large-scale low-head pumping stations are widely used in areas such as water resource allocation, water environment improvement, agricultural irrigation, and urban flood control in plain areas. In vertical pump devices and inclined pump devices that are widely used in low-lift pumping stations, the water outlet channels connected to the pump guide vanes are curved. The low hump outlet channel of the vertical pump device needs to be bent more than 90°, and the oblique outlet channel of the inclined pump device needs to be bent in an "S" shape first upward, then downward, and then upward. [0003] The o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/40F04D29/66
CPCF04D29/406F04D29/669
Inventor 徐磊颜士开施伟刘军陆林广陆伟刚金玉杰王东伟
Owner YANGZHOU UNIV
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