Input device for eccentric spiral pump has rise of spiral equal to at least half the filing funnel width measured in axial direction of spiral

摘要

The input device (2) is for an eccentric spiral pump (1). It includes a spiral (4) under a filling funnel (11). The rise of the spiral is equal to at least half, possibly all the width of the filling funnel measured in the axial direction of the spiral. The boundary line (12) of the external diameter of the spiral widens towards the drive shaft of the input device so that a narrow through gap is formed with the casing (3) round the spiral.