Clean-room ceiling module

Details Clean-room ceiling module Clean-room ceiling module

1993-11-30

1995-10-31

Joyce, Harold

Ventilation

Clean room

553852, 55423, 55437, 55473, 454296, 454906, F24F 316

Patent

active

054624843

DESCRIPTION:

BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION

This application is a national phase application corresponding to PCT/EP92/01297 filed Jun. 10, 1992 and based in turn on German national application P41 22 582.1 filed Jul. 8, 1991 under the International Convention.


FIELD OF THE INVENTION

The invention relates to a clean-room ceiling module with a laminar air flow technology, with three superimposed chambers separated by two false floors, whereby the chambers are interconnected by openings alternately arranged in the false floors, the upper chamber has a return-air opening in the module ceiling on the side opposite to the opening in the upper false floor.
Certain production processes, for example in micro-electronics, precision mechanics, optics or in the pharmaceutical industry, require clean, dust-free atmospheres, which require the technology of clean-room installations. In the so-called laminar air flow technology the clean atmosphere is produced by passing high-grade filtered air in a low-turbulence displacement flow through the clean room.
In the clean-room installation based on laminar air flow technology described in the EP-A 2 0 202 110 air under pressure is supplied by fans in a chamber between the ceiling and a false ceiling formed by high-efficiency filters. The air purified by the high-efficiency filters traverses the clean room vertically downwardly, is aspirated from the clean room through lateral channels. In this installation the elements of clean-room technology are fixedly mounted.
Since the production conditions in many fields change with increasing rapidity, there is a great deal of interest in clean-room systems which can be quickly assembled and disassembled, wherein new clean rooms can be quickly set up, old ones can be removed or already existing ones can be enlarged or reduced in size.
This has led to the development of modular systems.
EP-Al 0 196 333 for instance describes a clean-room system is which has a false ceiling with a support system and ceiling modules, which are designed as filter-fan modules, return-air modules and as blind modules. Through different arrangements of the various ceiling modules, zones with different degrees of cleanliness are set up.
A further clean-room system with various ceiling modules is described in the brochure "Flexi-Reinraum". This system is also suited only to set up smaller areas based on the laminar air flow technology with a higher degree of cleanliness, i.e. Class 100 or under, within a larger clean room. An arrangement of several rows of filter-fan modules (filter-fan modules) is not possible due to space restrictions.
A precondition of the laminar flow in the clean room is an even speed distribution downstream of the high-efficiency particulate air filters, must be generated by a uniform flow into the filters.
The high-efficiency particulate air filters have very high air resistances and considerably reduce the flow velocity. Therefore only the static pressure fraction of the air flow upstream of the high-efficiency particulate air filter is effective.
The laminar air flow technology requires therefore an air flow with the lowest possible turbulence and with the highest possible static pressure fraction in the chamber before the high-efficiency particulate air filters.
A low-turbulence flow is favored by a one-sided air supply to this chamber before the high-efficiency particulate air filters. The static pressure fraction of a flow can be increased through the transformation of dynamic pressure into static pressure.
Such a transformation is achieved by guiding the air through a chamber system with several chambers, thereby reducing the flow velocity.
From DE-U 88 05 774 such a chamber system is known with so-called tunnel modules, which can be arranged in a row one after the other for the construction of clean rooms with laminar air flow technology with the highest degree of cleanliness.
A tunnel module consists of an upper part and two lateral walls. The upper part has a chamber system with a return-air opening, a fan and superimposed chamb

REFERENCES:
patent: 1879107 (1932-09-01), Couch
patent: 4549472 (1985-10-01), Endo et al.
patent: 4560395 (1985-12-01), Davis
patent: 4810269 (1989-03-01), Stackhouse et al.

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