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Structural design of pump with front preswirl plate of inducer having long and short vanes

A technology of long and short blades and structural design, which is applied to parts, pumps, and pump components of pumping devices used for elastic fluids. It can solve problems such as water pump cavitation damage and unreasonable design of water inlet pipes, and prevent cavitation. , Improve the inlet flow field and reduce the effect of NPSH

Inactive Publication Date: 2013-06-05
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the rotation of the blades, or the unreasonable design of the water inlet pipe, etc., the water flow has a certain rotation when it enters the pump inlet.
The pre-swirl of the pump inlet may cause the pump not to work in the high-efficiency area, and in more severe cases, it may cause cavitation damage to the pump

Method used

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  • Structural design of pump with front preswirl plate of inducer having long and short vanes
  • Structural design of pump with front preswirl plate of inducer having long and short vanes
  • Structural design of pump with front preswirl plate of inducer having long and short vanes

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Embodiment Construction

[0012] figure 1 , figure 2 with image 3 Together determine the structural form of the pump in this embodiment. The inducer (3) and the main shaft (5) are threadedly connected, and the fluid enters the main impeller (2) through the pre-rotation plate (9) and the inducer (3), and then enters the pump body (1) and the discharge pipe. In the present invention, a pre-rotation plate is arranged in front of the inducer with long and short blades. When the fluid passes through the pre-rotation plate, the pre-rotation at the inlet is stopped. When the fluid flows through the inducer with long and short blades, the inlet pressure becomes larger, and the inlet of the main impeller (2) is less prone to cavitation. The structural design of the pump with long and short blade inducers and pre-rotating plates in front of the pump improves the inlet flow field of the impeller, improves the cavitation performance of the pump, prevents cavitation at the inlet of the impeller, and prolongs it...

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Abstract

The invention relates to structural design of a pump with a front preswirl plate of an inducer having long and short vanes. The inducer is provided with two long vanes and two short vanes. According to the design, the long and short vanes are spaced, the short vanes are located at the tail of the inducer, and the short vanes are disposed between the long vanes. Therefore, occurrence and development of flow separation are prevented effectively. The inducer is fine in cavitation resistance, so that inlet flow field of an impeller can be improved. In addition, formed lift enables net positive suction head to be lowered, and prevention on impeller cavitation is promoted. The tail of the preswirl plate extends to the inducer at an acute-angle, the tail is kept equal to an inlet edge of the inducer with long and short vanes in edge distance, the inlet flow field can be improved effectively, and pre-whirling is prevented.

Description

technical field [0001] The invention relates to the structural design of a pump with a pre-rotating plate in front of a long and short vane inducer, which is used for improving the anti-cavitation ability of the pump and improving the flow field at the inlet of the impeller. Background technique [0002] At present, the inducer has been widely used to improve the anti-cavitation performance of the pump. The inducer belongs to the axial flow impeller, which has the geometric characteristics and cavitation characteristics of the axial flow impeller. The inducer itself has a small load and low power. As long as it cooperates properly with the main impeller, it can change the flow of the impeller inlet. However, the conventional The internal flow field of the inducer is not ideal, and the gap between adjacent blade outlets is too large, which may easily cause shedding and boundary layer separation near the outlet of the inducer blades. The design of the pump assumes that the fl...

Claims

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Application Information

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IPC IPC(8): F04D29/18F04D29/44F04D29/66
Inventor 朱荣生龙云付强王秀礼
Owner JIANGSU UNIV
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