Fan assembly with exhaust offset

The fan assembly with a constricted exhaust surface offset from a pocket surface improves airflow efficiency and reduces tip clearance gaps, addressing manufacturing challenges and enhancing performance in ventilation systems for animal houses.

WO2026136152A1PCT designated stage Publication Date: 2026-06-25THE GSI GRP LLC
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
THE GSI GRP LLC
Filing Date
2025-12-12
Publication Date
2026-06-25

AI Technical Summary

Technical Problem

Conventional ventilation fans in animal houses face challenges in achieving optimal performance due to difficulties in reducing tip clearance between fan blades and shroud, which affects airflow efficiency and energy usage, despite the desire for tighter manufacturing tolerances.

Method used

A fan assembly design featuring a fan shroud with a constricted exhaust surface longitudinally offset from a pocket surface, creating an annular pocket that allows fan blades to extend into, resulting in a smaller effective tip clearance gap.

Benefits of technology

The design enhances airflow efficiency and reduces air return, improving air flow rate per watt at higher static pressures compared to conventional designs, while maintaining manufacturability without excessive tolerance requirements.

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Abstract

A fan assembly has a rotatable propeller having a plurality of fan blades, each having an outer tip. A cylindrical fan shroud surrounds the propeller and has an inner surface facing the propeller. The inner surface comprises a pocket surface longitudinally aligned with the propeller and a constricted exhaust surface longitudinally downstream of the pocket surface and radially offset from the pocket surface by a pocket depth. Outer tips of the fan blades may define a tip clearance gap between the propeller and the inner surface. The outer tips may extend into an annular pocket. An effective tip clearance gap, defined by a distance between a diameter of the constricted exhaust surface and the outer tips of the fan blades, is smaller than a tip clearance gap between the outer tips and the pocket surface. Related fan assemblies for agricultural building are also disclosed.
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