Spatial guide vane body of vertical type multi-stage pump

Abstract

The invention discloses a spatial guide vane body of a vertical type multi-stage pump. The spatial guide vane body comprises an outer housing and an inner housing, and is characterized in that the right end of the outer housing is provided with a connecting flange; the middle position of the inner housing is provided with a guide vane hub; a guide vane blade is arranged between the outer housing and the inner housing; the tail end of the guide vane blade is provided with an extension section in the axial direction; the right side of the guide vane hub is provided with a secondary impeller; thesecondary impeller is connected with the outer housing in a manner of being matched with the outer housing; the left end of the secondary impeller is set as an impeller inlet; the secondary impelleris provided with a plurality of impeller blades; a space is kept between an impeller blade inlet and the impeller inlet; and an impeller blade outlet is flush with the right end of the secondary impeller. The spatial guide vane body disclosed by the invention has the advantages of being simple in structure, eliminating the rotational component of the speed of fluid at the inlet of the secondary impeller more completely, reducing the turbulence intensity of the fluid, improving the flowing state of the impeller inlet, reducing hydraulic loss of a transition region of a guide vane of the impeller, also remarkably increasing the lift of the next stage of impeller, and improving the running stability of the pump.

Description

technical field [0001] The invention relates to the field of pumps, in particular to a space guide vane body of a vertical multistage pump. Background technique [0002] Space guide vanes are widely used in long-axis submersible pumps, submerged pumps, and guide vane mixed-flow pumps. Change to axial flow and eliminate the peripheral velocity component. However, according to all the current data, due to the limited number of blades, the flow cannot completely follow the trend of the guide vane outlet streamline, and there must be a circumferential component of velocity. In the basic equation of the pump, if there is a rotational component of the impeller inlet speed, that is, the head H of the impeller of the next stage will be significantly reduced, and the performance of the whole pump will be greatly lost. [0003] The space guide vane body and the impeller have a dynamic and static matching relationship, and the flow structure in the transition zone is complex, and flo...

AI Technical Summary

Problems solved by technology

The space guide vane body in the prior art has problems such as the inability to eliminate the velocity rotation component of the inlet fluid of the secondary impeller, and the large hydraulic loss in the transition area of ​​the impeller guide vane.

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