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Laminar Flow Thin Chemical Breather Filter for Direct Access Storage Device

IP.com Disclosure Number: IPCOM000107146D
Original Publication Date: 1992-Jan-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Beck, JL: AUTHOR [+7]

Abstract

A Flatpak chemical breather filter used in direct access storage devices (DASDs) protects the product from external airborne ionic, organic, and particulate contamination. This function is provided in a low-profile form factor that directs the incoming air parallel to the filter bank.

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Laminar Flow Thin Chemical Breather Filter for Direct Access Storage Device

       A Flatpak chemical breather filter used in direct access
storage devices (DASDs) protects the product from external airborne
ionic, organic, and particulate contamination. This function is
provided in a low-profile form factor that directs the incoming air
parallel to the filter bank.

      The filter consists of three main elements (see Figs. 1 and 2);
the housing 1, the filter bank 2, and the cover plate 3.  Air
external to the DASD enters the filter through the inlet hole 4 in
the cover plate 3.  The air then travels down the inlet diffusion
channel 5 in corporated into the housing 1.  At the end of the inlet
diffusion channel 5 the air enters the upstream plenum 6 for the
filter bank 2.  The geometry of the inlet diffusion channel 5 imparts
a flow parallel to filter bank 2 in the upstream plenum 6.  Because
of the flow rates involved and the pressure drop across the filter
bank 2, the air diffuses through the filter bank uniformly across the
entire surface area.  This flow path arrangement through the filter
bank 2 significantly improves performance.  After the air travels
through the filter bank 2 where the contamination is removed, it
enters the downstream plenum 7.  From there, the contaminate-free air
flows through the downstream diffusion channel 8 and into the file
via the breather filter exit port 9.