Ventilation system

Abstract: Ventilation system consisting of louvres (6) and valves (21) where the valves (21) function as precipitation-tight ventilation regulators providing a ventilation coefficient (c v ) in the range of 0 to 0.6. When the valves (21) are fully opened in case of fire the ventilation coefficient (c v ) is in the range of 0.5 to 0.9. The fixed louvres (6) consist of two extruded profiles (7, 12) and connecting strips (11). The valves (21) consists of an extruded profile (22) and strips (23, 24) and are hinged over the full length of the louvre (6). The hinge uses bearing elements (20). The extruded profiles (7,12) are provided with gutters (8, 9, and 14) to catch precipitation.

Description: The invention concerns a ventilation system to ventilate spaces with natural draught. The ventilation system is used on roofs or in walls of industrial buildings. The ventilation system is equipped to ventilate spaces while precipitation is caught in extrusions with gutters and where the in-between distance of the louvres and flaps prohibit the weather entries to pass along the gutters and enter the ventilated spaces. The ventilation system provides the possibillity to open the flaps completely to obtain a maximum passage when necessary in case of a fire to expel large quantities of smoke and combustion fumes. Ventilation systems which are equipped with adjustable flaps are well known. The European patent application EP-A-0103861 describes a system with fixed louvres, placed at about 45 degrees in reference to the airstream and is equipped with adjustable louvres which can rotate about 90 degrees. The passage of this type of constructions is restricted by the requirement to keep out precipitation to such an extent that the ventilation capacity is hardly sufficient in case of fire. The invention provides a system as defined in the single claim A universal ventilation system requires an air passage with a C v -value of 0 to 0.6. In case of fire the required C v of the air passage should have a value of 0.5 to 0.9. The values of air passage can be measured following the standard method described in the norm DIN 18232, part 3 chapter 3.7. It is of great importance for safety provisions that moving parts will be moved regularly to be sure that the provisions function in case of emergency. In the system of the invention the same flaps that are used for normal ventilation are opened extra to provide the necessary air passage for the ventilation in case of fire. This means that the flaps stay movable because of the daily adjustments. The invention will be described with the help of the drawing. Fig. 1 shows the system in cross section. Fig. 2 shows a cross section of a louvre and flap. Fig. 3 shows a part of the bearing. In the roof (1) or wall of the ventilated space (2) is a ventilation opening (3) where a frame (4) is placed. On this frame (4) is a casing (5). In this casing (5) louvres (6) are fastened. These louvres (6) are being composed from parts which fit together and are connected with fastening measurements. The lower part is an extruded profile (7). This profile (7) is partly in the form of a gutter (8) and a catcher of water drops (9), at (10) is a provision to connect extruded profile (7) to strip (11) made from sheet. On the other side of strip (11) a second extruded profile (12) is fastened with provisions (13). The extruded profile (12) contains a gutter (14) with dripping edge (15), a flat part (16) with provisions (17) to mount. From provision (13) goes a flat part (18) which is connected to a cylindrical (possibly hollow) part (19). Bearing parts (20) fit around the cylindrical part (19) which makes it possible to rotate flap (21) on the cylindrical part (19). The flap (21) is composed of an extruded profile (22) and strips (23) and (24) where (24) is meant as reinforcement. The extruded profile (22) contains providings for connections (25) for strip (23) and a curved part (26) that fits and rotates around bearing part (20). The curved part (26) grasps the bearing part (20) for more than 180 degrees. Rims (27) serve to hold a strip with a mohair seal. Operating arms (28) with opening (29) which are connected to the flaps (21) are activated by rods (not drawn). In Fig. 1 (30) the position of the flaps (21) is at normal ventilation. In this position precipitation caught by flap (30) will be led to gutter (14). Precipitation which passes flap (30) will be caught by gutter (8) and gutter (14) of the next louvre (6). The precipitation is lead out by holes (not drawn) near the end of the louvres (6). At (31) is indicated the position of the flap with maximum passage in case of fire. The bearing part (20) is cylindric and fits around the cylindrical part (19) and in the curved part (26) of profile (22). A part of the wall of the cylinder is taken away and leads through the flat part (18) of profile (12). Along the whole length of the hinge a number of bearing parts (20) are placed at even distances. If necessary distance parts (not drawn) can be mounted. The bearing parts (20) can possibly be made out of sinter bronze. Because of the fact that the hinge between louvre (6) and flap (21) is as long as the louvre itself, it is necessary to support the louvres at the end only. The ventilation system makes it possible to use elongated ventilator openings which ensures an efficient use of the opening. In some cases the louvres (6) and flaps (21) can be manufactured of single extruded profiles and make use of appropriate materials like aluminum or plastic. The strips of louvres (6) and flaps (21) can be made of transparant materials to have skylight entering the space.

Claims: A ventilation system using natural draught for ventilation of spaces comprising louvres (6) fixed in a casing (5) and pivoting flaps (21) placed on the outside thereof, which together govern the airflow through the ventilation opening (3), characterised in that the fixed louvres (6) are composed out of two extruded profiles (7, 12) which are connected by a strip (11); the inner profile (7) of the fixed louvre forms a gutter extending on the same side of the strip (11) as the flap (21) and a drop catcher (9) on the opposite side thereto; the outer profile (12) of the fixed louvre forms a gutter (14) on the opposite side of the strip (11) to the flap (21) such that in the normal ventilation position precipitation will flow into the gutter from the flap; the flaps (21) are composed out of an extruded profile (22) and strips (23, 24); a fitting part (26) of the extruded profile (22) of the flap (21) hinges around a cylindrical part (19) of the outer one of the extruded profiles (12) of the fixed louvres (6); the arrangement being such that at minor openings an adjustable ventilation with a ventilation coefficient (C v ), as measured according to DIN 18232 part 3, between 0 and 0.6 and which is precipitation-tight is obtained, whilst with fully opened flaps, such as in event of fire, the ventilation system features a ventilation coefficient (C v ) between 0.5 and 0.9.

Inventors: RUYS JOHANNES LEONARDUS MARIA, RUYS, JOHANNES LEONARDUS MARIA
Applicants: RMTD INT BV, R.M.T.D. INTERNATIONAL B.V.
Application year: 1990
Main classification: F24F7
IPC codes: F24F13, F24F7