Radial deep-well pump with return guide vane

Abstract

The invention discloses a radial deep-well pump with a return guide vane and belongs to fluid machinery. The radial deep-well pump comprises two or more pairs of impellers and a flow guide shell as well as a water inlet section and a water outlet section which are all connected in series and linked through a pull rod, wherein the return guide vane equipped with an upper cover plate and a lower cover plate serves as a guide vane of the flow guide shell; an enclosed impeller equipped with a front cover plate and a rear cover plate serves as each impeller; the gap between the outer diameter of the front cover plate of each impeller and the maximum inner diameter of the flow guide shell is 1-1.5 mm; the outer diameter of the rear cover plate of each impeller is smaller than that of the front cover plate of each impeller and greater than that of the outer diameter of the lower cover plate of the guide vane; and a cylindrical vane with an involute serves as the return guide vane. The radial deep-well pump disclosed by the invention has the advantages that the cylindrical vane is adopted as the return guide vane, the foundry technology for the cylindrical vane is the simplest, and the production cost is the lowest; the return guide vane takes the shape of the involute, the flow area of an involute flow channel is the simplest to control, the inlet setting angle is the easiest to calculate, and the outlet setting angle is always 90 degrees; and accordingly the hydraulic loss of the radial deep-well pump is relatively low and the water pump efficiency is relatively high.

Description

technical field [0001] The invention relates to a fluid machine, especially a submersible deep well centrifugal pump or a long axis deep well pump mainly used in a motor well. Background technique [0002] The deep well centrifugal pump is a slender vertical multistage centrifugal pump, which consists of at least two pairs of impellers and guide casings connected in series together with a water inlet section and a water outlet section. At present, most deep well centrifugal pumps at home and abroad are deep well centrifugal pumps using space guide vanes. Patent application number 200420010385.1 "submersible electric pump for well" is a deep well centrifugal pump using space guide vanes. This kind of deep well centrifugal pump has low single-stage head and long axial dimension, and its manufacturing cost is very high. The invention patent "A Deep Well Centrifugal Pump" (Patent Application No. 200510123015.8) adopts anti-guide vanes twisted at the inlet side. Although its sin...

AI Technical Summary

Problems solved by technology

This kind of deep well centrifugal pump has low single-stage head and long axial dimension, and its manufacturing cost is very high.

The invention patent "A Deep Well Centrifugal Pump" (Patent Application No. 200510123015.8) adopts anti-guide vanes twisted at the inlet side. Although its single-stage head is high and the axial dimension is short, the production cost is much lower than that of deep well centrifugal pumps with space guide vanes. However, the manufacturing mold of the guide vane castings is very complicated, which makes it almost impossible to make cast iron guide vanes. Only plastic guide vanes and precision casting stainless steel guide vanes can be made.

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