Blower Arrangement Flow Dividing Nozzle Recirculation Loss
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Solution Overview
Problem
Conventional blower arrangements experience volumetric losses due to recirculation volume flow, which counteracts the advantageous pulse flow between the impeller and nozzle, leading to inefficiency.
Innovation Solution
A blower arrangement with an axial intake opening, an intake nozzle, and an outer nozzle that creates a circumferential radial gap, allowing the total volume flow to be divided into a main volume flow and a secondary volume flow, with the secondary flow further divided by the cover plate and outer nozzle, eliminating recirculation losses while maintaining pulse flow benefits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional nozzle arrangement is used, then the pulse flow between impeller and nozzle is maintained, but a recirculation volume flow occurs causing volumetric loss
Solution Approach 1:
The flow path is segmented into distinct channels: a first flow path for the main volume flow through the impeller, and a second flow path for the secondary volume flow through the inlet nozzle duct. The cover plate and outer nozzle create separate passage regions that guide these flows independently, preventing mixing and recirculation while maintaining the pulse flow effect in the nozzle gap.
Solution Approach 2:
The harmful recirculation volume flow is extracted and redirected into the second flow path through the inlet nozzle duct. By providing a dedicated passage for the secondary volume flow between the outer nozzle and intake nozzle, the design removes the recirculation loop that would otherwise return flow to the impeller suction side, converting the loss into a useful flow component.
2Loss of energy
If the recirculation volume flow is eliminated, then volumetric loss is reduced, but the advantageous pulse flow in the nozzle gap may be lost
Solution Approach 1:
Different regions of the flow field are given different qualities and functions. The nozzle gap region maintains high-velocity pulse flow characteristics for effective flow deflection, while the inlet nozzle duct region provides a separate path for secondary volume flow that does not interfere with the impeller suction. This spatial differentiation allows simultaneous achievement of pulse flow benefits and recirculation elimination.
Data Source
AI summary
A blower arrangement comprising an impeller, which has an axial intake opening formed by a cover plate covering impeller blades at least in sections, by an intake nozzle connected upstream of the impeller, which extends at least in sections into an overlap section in the intake opening of the impeller, wherein a circumferential nozzle gap is formed between the intake nozzle and the cover plate of the impeller, an outer nozzle, which is arranged spaced apart in the radial direction in relation to the impeller and the intake nozzle and enclosing them in the circumferential direction. A first circumferential radial gap is provided between the outer nozzle and the intake nozzle, which forms an inlet nozzle duct extending in the flow direction. A second circumferential radial gap is provided between the outer nozzle and the cover plate of the impeller, which forms a gap duct extending in the flow direction.