Patent ID: 11873838
Assignee: FISHER & PAYKEL HEALTHCARE LIMITED
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  A | IPC A  F

Claim 0:
1. A blower for a breathing apparatus comprising:
a housing with an inlet and an outlet,
a motor within the housing for rotating an impeller,
a diffuser within the housing between the impeller and the outlet, the diffuser comprising a plate with diffuser vanes, the plate including a flow guide extending from the plate and tapering in diameter towards a point, the flow guide being arranged to promote a smooth redirection of flow from the diffuser towards the outlet, and
the diffuser vanes being arranged in a plurality of cascades on the plate, each cascade comprising a series of diffuser vanes configured to accommodate movement of reverse airflow,
wherein a spacing between each pair of adjacent cascades of the plurality of cascades increases from narrower to wider as the each pair of adjacent cascades extend toward a center of the plate, wherein the spacing between the each pair of adjacent cascades is defined in a direction normal to a centerline extending between the pair of adjacent cascades.