Browse Prior Art Database

Fanned-Air Short-Circuit Presenter

IP.com Disclosure Number: IPCOM000106483D
Original Publication Date: 1993-Nov-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 2 page(s) / 64K

Publishing Venue

IBM

Related People

Coles, R: AUTHOR [+2]

Abstract

Disclosure is a technique for automatically preventing unwanted recirculation of cooling air through a failed fan in a multi-fan cooling system. In one embodiment, an iris shutter arrangement, mounted on the inlet side of the fan, is opened radially by the dynamic effect of the airflow induced by the fan and when the fan fails, a spring mechanism forces the iris to close. Another embodiment employs axial movement of a concentric cone of annular baffles.

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Fanned-Air Short-Circuit Presenter

      Disclosure is a technique for automatically preventing unwanted
recirculation of cooling air through a failed fan in a multi-fan
cooling system.  In one embodiment, an iris shutter arrangement,
mounted on the inlet side of the fan, is opened radially by the
dynamic effect of the airflow induced by the fan and when the fan
fails, a spring mechanism forces the iris to close.  Another
embodiment employs axial movement of a concentric cone of annular
baffles.

      Iris Shutter (Fig. 1) - Situated and mounted at the inlet side
1 of a centrifugal fan assembly 2 in an iris shutter (similar to a
camera lens iris), consisting of radially moving blades 3 capable of
shutting off air movement from outside 1, to the fan.  The iris
blades are held in the closed position by means of peripheral spring
pressure if the fan stops.  The iris opens due to the dynamic effect
of internal air flow generated by the fan impeller impinging on
several shutter driver vanes 4 spaced around a shutter driver ring 5
producing a limited circular movement of ring 5.  Each iris blade 3
pivots on a fixed pin allowing the heel of blade 3 to be driven by a
shutter driving pin 7 projecting from driving ring 5.  Thus movement
of the driving ring from impeller air pressure on the shutter causes
all iris blades to open by interaction between shutter drive pins,
blade heel leverage and pivot pins.  Spring action closes the iris.

      An alternative arrangement of automatic shutter...