Method for improving cavitation-erosion performance of centrifugal pump

A centrifugal pump and cavitation technology, which is applied to parts, pumps, and pump components of pumping devices used for elastic fluids, can solve unreasonable design of blade tail width, hump of centrifugal pump performance curve, and restricted effective working range, etc. problems, to achieve the effect of improving the phenomenon of low local pressure, improving cavitation performance, and improving the effective working range

Inactive Publication Date: 2015-07-22
CHINA JILIANG UNIV
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  • Summary
  • Abstract
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Problems solved by technology

The inefficiency of some centrifugal pumps lies in the fact that their design is only based on empirical formulas, lacking numerical simulation verification, and there are many unreasonable places
The unreasonable angle of attack at the head of the blade will cause the head to impact, causing the hydraulic loss of the fluid to be too large, so that the efficiency of the centrifugal pump is low and the head is not high
The unreasonable design of the width of the blade tail will lead to the obvious hump phenomenon of the performance curve of the centrifugal pump, which seriously restricts its effective working range

Method used

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  • Method for improving cavitation-erosion performance of centrifugal pump
  • Method for improving cavitation-erosion performance of centrifugal pump
  • Method for improving cavitation-erosion performance of centrifugal pump

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with accompanying drawing.

[0024] Such as figure 1 As shown, the prototype pump inlet installation angle relative flow angle are not equal, the difference between the two is the angle of attack , at this time there is a liquid flow impact on the blade head.

[0025] figure 2 Inlet mounting angle for modified pump shown relative flow angle The relationship between the two, we can see the difference between the two, both the angle of attack , to improve the impact of the blade head.

[0026] Depend on image 3 with Figure 4 It can be seen that the modification of the blade curve is mainly concentrated on the outlet width of the blade and on the front and rear cover curves, the modified blade outlet width Compared with the prototype pump vane outlet width increased by about 20%, and the area of ​​the impeller flow path increased a lot compared to the same period last year.

[002...

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Abstract

The invention relates to a method for improving the cavitation-erosion performance of a centrifugal pump. According to the method for improving the cavitation-erosion performance of the centrifugal pump, through the reducing of a blade head impact angle, the impact of a blade and incoming flow is reduced, the impact condition of impeller head liquid flow and the blade is improved, and the adaptation to the incoming flow can be better achieved. The width of an impeller channel is increased, the curves of a front cover plate and a back cover plate are adjusted, the impact loss due to the fact that the liquid flow is absorbed into the impeller from an outlet position is reduced, the effective working area of the centrifugal pump is improved, and the energy waste is reduced. Through the above improvement, the speed of fluid in the pump is more even, the phenomenon of over low local pressure is improved, and therefore the cavitation-erosion performance of the centrifugal pump is improved.

Description

technical field [0001] The invention belongs to the technical field of fluid machinery and relates to a method for improving the cavitation performance of a centrifugal pump by modifying the blade profile. Background technique [0002] The water pump is a general mechanical product with a large quantity and a wide range. Centrifugal pumps are one of the most numerous and widely used pump products. Carrying out basic research on the internal flow mechanism of centrifugal pumps and improving the operating efficiency of centrifugal pumps not only has huge economic benefits in terms of energy saving and environmental protection, but also has important and far-reaching significance for promoting the development level of my country's pump industry. [0003] The working body of the centrifugal pump is composed of a water suction chamber, a pressure water chamber and an impeller. The impeller is the most important part of the centrifugal pump, and the shape of the main blade of it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/22
CPCF04D29/245F04D29/669
Inventor 包福兵赵飞狄辉彬凃程旭李楠
Owner CHINA JILIANG UNIV
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