Ventilation – Clean room
Reexamination Certificate
1999-12-21
2001-03-13
Joyce, Harold (Department: 3749)
Ventilation
Clean room
C055S471000, C055S473000, C181S225000
Reexamination Certificate
active
06200215
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a fan module for use in clean room applications.
TECHNICAL BACKGROUND
A filter-fan-unit designed as a modular unit in clean room applications is previously known, see for instance Babcock-BSH “Clean room-tunnel-module”, prospect paper II/87. Adjacent to a side wall of this unit there is a fan with which the air is sucked in and transported into an air flow room, extended from the horizontal outlet of the fan to the opposite wall, then reversed 180° and limited downwards by the filter means placed under the partition wall and at a distance therefrom. With this design the air will have long flow distances leading to correspondingly high flow losses and a correspondingly high energy consumption. This air guidance also makes it very difficult to obtain an even flow distribution over the filter surface. Further, this device has a comparatively high sound pressure level.
Efforts have been made to overcome the drawbacks of this known structure, e.g. according to EP,C,497296, wherein the flow room has been designed as one or several annular channels, and wherein at least one of the walls of the flow room is made of a sound-absorbing material. This is not an optimal solution either in view of flow stabilization and silencing of noise.
SUMMARY OF THE INVENTION
One object of the invention is to provide a fan module with enhanced flexibility compared to prior art fan modules.
Another object of the invention is to provide a fan module with better noise silencing characteristics compared to prior art fan modules.
The above and other objects of the present invention are achieved with the fan module according to the present invention, which is characterized in that it comprises outer, vertical restriction walls with a lower edge part having a planar lower surface as well as an element protruding from the outside edge of the planar lower surface for cooperation with a filter docking module arranged in a roof filter frame and having a substantial planar upper surface with an extension corresponding to said planar lower surface, whereby said protruding element is designed to overlap part of said filter docking module.
Developments and embodiments of the invention are disclosed in the subclaims and in the following detailed description of the invention.
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Jansson Peter
Larsson Bertil
ABB Flakt AB
Burns Doane , Swecker, Mathis LLP
Joyce Harold
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