EP0436239A1

EP0436239A1 - Ventilation system

Info

Publication number: EP0436239A1
Application number: EP90203062A
Authority: EP
Inventors: Johannes Leonardus Maria Ruys
Original assignee: Rmtd International Bv
Current assignee: Rmtd International Bv
Priority date: 1989-12-01
Filing date: 1990-11-19
Publication date: 1991-07-10
Anticipated expiration: 2010-11-19
Also published as: DE69018229T2; NL8902977A; DE69018229D1; ATE120533T1; EP0436239B1

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 gullies and where the in-between distance of the louvres and valves prohibit the weather entries to pass along the gullies and enter the ventilated spaces. The ventilation system provides the possibillity to open the valves 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 valves are well known.
The passage of these known constructions is restricted by the requirement to keep out precipitation to such an extend that the ventilation capacity is hardly sufficient in case of fire.
The invention provides a system where control valves are used which are part of the sealing against precipitation when used as a ventilation control. While in case of fire the valves can be fully opened. 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 work in case of need. In the system of the invention the same valves 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 valves 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 valve.
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 valve (21) on the cylindrical part (19).
The valve (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 valves (21) are activated by rods (not drawn).
In Fig. 1 (30) the position of the valves (21) is at normal ventilation. In this position precipitation caught by valve (30) will be led to gutter (14). Precipitation which passes valve (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 valve 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 valve (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 valves (21) can be manufactured of single extruded profiles and make use of appropriate materials like aluminum or plastic.
The strips of louvres (6) and valves (21) can be made of transparant materials to have skylight entering the space.

Claims

Ventilation system using natural draught for ventilation of spaces characterised in that the on the outside placed valves (21) provide at minor opening an adjustable ventilation which is precipitation-tight while in case of fire and fully opened valves (21) the ventilation system features a ventilation coefficient (c_v) between 0.5 and 0.9.
Ventilation system using natural draught for ventilation of spaces as claimed in claim 1 characterised in that fixed louvres (6) and rotating valves (21) governs the flow while the fixed louvres (6) are composed out of two extruded profiles (7), (12), which are connected by a strip (11) and the valves (21) composed out of an extruded profile (22) and strips (23), (24), where a fitting part (26) of the extruded profile (22) of the valves (21) hinge around a cylindrical part (19) of one of the extruded profiles (12) of the fixed louvre (6).
Ventilation system using natural draught for ventilation of spaces as claimed in claim 1 and 2 characterised in that the extruded parts (7) and (12) of the fixed louvres (6) are provided with parts having the form of gutters (8), (9) and (14) to lead out precipitation.
Ventilation system using natural draught for ventilation of spaces as claimed in claim 1, 2 and 3 characterised in that the valves (21) in combination with the fixed louvres (6) form a precipitation-tight ventilation unit with a ventilation coeficient in the range of 0 to 0.6.
Ventilation system using natural draught for ventilation of spaces as claimed in claim 1, 2, 3 and 4 characterised in that the hinge reaches along the whole length of both the fixed louvres (6) and valves (21).
Ventilation system using natural draught for ventilation of spaces as claimed in claim 1, 2, 3, 4 and 5 characterised in that a bearing, consisting of comparative short parts (20), is placed between the bearing part (26) of the valves (21) and the bearing part (19) of the fixed louvres (6).
Ventilation system using natural draught for ventilation of spaces as claimed in claim 1, 2, 3, 4, 5 and 6 characterised in that the ventilation system can be used as well horizontal as vertical.
Ventilation system using natural draught for ventilation of spaces as claimed in claim 1, 2, 3, 4, 5, 6 and 7 characterised in that the fixed louvres (6) and the valves (21) are both consisting of a single extruded profile.