Ventilation – Having both inlet and outlet airways – With air pump means
Patent
1996-03-11
1998-06-16
Joyce, Harold
Ventilation
Having both inlet and outlet airways
With air pump means
553852, 55467, F24F 316
Patent
active
057660727
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a ventilation plant comprising fans for distribution of intake air and exhaust air in branch ducts, devices for balancing the air flows through the branch ducts by means of throttling devices positioned in the ducts, devices for filtering the air, and sound damping devices.
2. Description of the Related Art
Plants of this type usually are provided with filter boxes positioned in the ducts and containing laterally replaceable filter units. Measures are taken there that the filters are causing as low pressure drops as possible in order not to load the fans unnecessarily. Therefore, the filter units have a complicated design with a large area in spite of a limited space resulting in difficulties in connection with sealing members which have a tendency to by-pass air unfiltered. The boxes are also space consuming. Moreover, throttling devices in the shape of adjustable valves in the ducts are necessary. The mounting of these and the adjusting of them to proper balancing of the air flows in the ducts is a considerable complication and a time consuming work.
SUMMARY OF THE INVENTION
The object of the invention is to achieve a ventilation plant of the kind initially mentioned in which the drawbacks mentioned above are eliminated, and which is specially suited for systems with extremely heavy demands for purity and functioning, and, as a consequence, simple and sufficient inspection possibilities, as for example in laboratory buildings and animal-occupied spaces.
This has been achieved, according to the invention, by the fact that in the different spaces the duct openings for intake air and for exhaust air are provided with tubular, thick-walled filters providing a pressure drop of such a magnitude, preferably of about 200 Pascal, that at properly adjusted flow velocities at the openings, preferably of about 2-5 m/sec, the filters are acting also as the throttling devices and the sound damping devices of the plant.
A solution to the problems of balancing air flows and the damping of the usually strong noise occurring when the air flows through the throttling devices in conventional plants has been achieved by the invention by a simple measure, which is completely against accepted or standard rules. Filters are installed having an interior or a built-in pressure drop of a magnitude making the installation of conventional throttling devices and accordingly also conventional sound-damping devices superfluous. Air flows noise lessly through the filters. The are positioned in the spacings at the openings for intake air and exhaust air, and specific throttling devices and sound damping devices are eliminated, so that the interior of the duct system becomes free from pollution as well as devices disturbing the air flow. Moreover, different spacings become separated from each other by the filters such that, for instance, disease carrying particles are prevented from being spread between different spacings, because normally the filters are of such a grade that disease carrying particles cannot penetrate the filters. The filters also act as sound-damping means between different spacings. The placing of the filters simplifies the important changing of the filters, which can be made out of fire-resistive material that can resist high temperatures without being destroyed, at least under the temperature circumstances existing in connection with release of a sprinkler system in case of fire.
BRIEF DESCRIPTION OF THE DRAWING
The invention will become more readily apparent from the following description, reference being made to the accompanying drawing showing a simplified diagram of a ventilation plant in a building.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The drawing discloses a building 1 with a number of room spaces 2. A straight duct 4 for intake air is suspended from the ceiling of a corridor 3 and connected to a fan 5 provided with a conventional filter 6. In parallel to the duct 4 there is a duct 7 for exhaust air conn
REFERENCES:
patent: 1052450 (1913-02-01), Berglund
patent: 3180363 (1965-04-01), Knarbakk
patent: 3458130 (1969-07-01), Juhlin
patent: 3465666 (1969-09-01), Knab
patent: 3714884 (1973-02-01), Christiansen
patent: 4150696 (1979-04-01), Meier et al.
patent: 5313803 (1994-05-01), Detzer
Joyce Harold
P.O. Andersson Konstruktionsbyra AB
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