FIELD: mechanical engineering; fans.
SUBSTANCE: invention is designed for centrifugal electric fans with spiral housing and impeller secured on motor shaft. Spiral housing is sectional, being made of thick-walled plates and curved thin-walled sheet with fastened end side adjoining thick-walled plates from inside. Description of invention contains expressions for determining lengths of plates and sheet basing on data of aerodynamic calculations. In assembled housing, places of supports of curved sheet on plates are located to provide spiral form of sheet stable owing to own elastic forces. Profiling of surfaces on section of air outlet from spiral housing is done by means of strips fixing end sides of sheet.
EFFECT: improved manufacturability of construction without requirement of expensive equipment at full-scale production.
2 dwg
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