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Browse Prior Art Database

Fan Acoustic Isolators

IP.com Disclosure Number: IPCOM000101233D
Original Publication Date: 1990-Jul-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Huerta, JL: AUTHOR [+2]

Abstract

Disclosed is a mechanical isolator for tube-axial fans for controlling acoustic noise. The isolator requires no assembly adjustments and provides fan mounting without the need for screws or fasteners.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 73% of the total text.

Fan Acoustic Isolators

       Disclosed is a mechanical isolator for tube-axial fans
for controlling acoustic noise.  The isolator requires no assembly
adjustments and provides fan mounting without the need for screws or
fasteners.

      Tube-axial fans are the air-moving devices generally used in
the air-cooling designs of electronic boxes such as computer system
units. The fans are almost always mounted to the box using some means
of mechanical isolation.  Without isolation, the fan vibration will
be transmitted to the box creating structure-borne acoustic noise.
Maintaining acoustic noise levels within specifications is critical
in IBM products.

      One method commonly used for isolation mounting of fans
consists of threads which are insert-molded in soft rubber. The
rubber around these insert-molded threads expands in the mounting
holes as the mounting screws are tightened. Tightening torque on the
screws is critical.  If the screws are over-tightened, isolation is
lost; if the screws are under-tightened, the fan will not be securely
mounted.  This common method of isolation mounting is expensive due
to parts and to critical assembly adjustments.

      The disclosed fan mounting isolators are soft rubber parts that
attach to the four fan corners using the existing holes on fan corner
flanges.  The fan-isolator assembly is then inserted into a pocket
which is formed into or attached to the box.  No adjustments or
special assembly instructions...