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Low specific speed impeller with function of drag reduction by grooves

A low-specific-rotation-number, groove-based technology, applied to parts of pumping devices for elastic fluids, non-displacement pumps, machines/engines, etc., can solve low-efficiency and wasteful impeller centrifugal pumps with low specific revolutions Large energy and hydraulic losses, etc.

Inactive Publication Date: 2013-07-10
JIANGSU UNIV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Due to the outlet width of the blades of the low specific speed centrifugal pump, the outer diameter of the impeller, and the shape of the axial flow channel, the hydraulic loss in the impeller is determined to be large, resulting in low efficiency of the low specific speed impeller centrifugal pump and a waste of energy.

Method used

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  • Low specific speed impeller with function of drag reduction by grooves
  • Low specific speed impeller with function of drag reduction by grooves
  • Low specific speed impeller with function of drag reduction by grooves

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Embodiment Construction

[0014] For the novel impeller of the present invention, the overall structure of the blade and the rear cover is first obtained by casting, and then the working surface and the back of the blade are processed by a CNC milling machine such as the attached Figure 4 In the V-shaped groove shown, the included angle of the groove is 60°, and the height of the groove is 2-4mm. The integral structure of front cover plate and blade and back cover plate is welded together again. Finally, the outer surface of the impeller is finished, and the precision of the mouth ring is guaranteed by lathe processing. Figure 5 keyway shown.

[0015] Through the above method, a low specific speed impeller with a new groove structure is processed. Since the impeller is only different from the traditional low specific speed impeller on the surface of the blade, and the impeller hub and front and rear cover plates have no corresponding changes, so When installing, it is still installed in the same wa...

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Abstract

The invention relates to a low specific speed impeller with the function of drag reduction by grooves. The low specific speed impeller provided with a dry three-phase asynchronous motor or a submersible motor is characterized in that series of grooves are made on pressure surfaces and suction surfaces of blades by machining or casting, and the grooves are 60-degree and 2-4mm in depth. The low specific speed impeller has the advantages that vortexes in an impeller passage are less strong, surface turbulent energy loss is reduced for the low specific speed impeller, and positive effects on improving the efficiency of a low specific speed pump, saving energy, absorbing shock and reducing noise are achieved.

Description

Technical field [0001] The invention is a low specific speed impeller with grooves for drag reduction. The designed specific speed of the impeller is less than 80, the number of blades is equal to or greater than 3, and the blades are cylindrical blades. The axial width of the blade inlet and outlet is the same, which can be used for The matching dry-type three-phase asynchronous dry-type motor or submersible motor belongs to the technical field of general mechanical product manufacturing. Background technique [0002] Low specific speed centrifugal pump has the characteristics of small flow and high head, and is widely used in agriculture, mining, chemical industry and other industries. The impeller of low specific speed centrifugal pump has the geometrical characteristics of narrow blade outlet width, large impeller outer diameter, narrow and long flow channel. Generally speaking, the losses in the pump mainly include mechanical loss, volume loss and hydraulic loss. For l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/22
Inventor 曹卫东代珣
Owner JIANGSU UNIV
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