Method and device for preventing distribution of fire gases in a ventilating system
AssigneePolmannen AB
InventorAnders Odelros
Life of this patent
Estimating the term…
Abstract
A method and device for preventing distribution of fire gases in a ventilating system that serves a number of fire compartments (15, 16), the ventilating air, during normal operating conditions, having a certain predetermined direction of flow at the inlet side and the outlet side of the fire compartments (15, 16). It is significant that when a predetermined lowest pressure drop is registered, for the ventilating air in the direction of flow, over a measuring spot at the inlet side or the outlet side, a blocking is effected of the flowing area of the ventilating air past the measuring spot.
Claims5
Device for preventing distribution of fire gases in a ventilating system that serves a number of fire compartments having an inlet side and an outlet side, said ventilating system comprising inlet ducts for supplying ventilating air to the fire compartments and outlet ducts to exhaust ventilating air from the fire compartments, such that the ventilating air, during normal operating conditions, has a certain predetermined direction of flow at the inlet side and the outlet side of said fire compartments;
- valve means being provided in the inlet ducts and the outlet ducts in connection with said fire compartments;
- said valve means comprising means for regulating a flowing area of the ventilating air;
- wherein the device comprises means for registering, over a measuring spot in connection with said flowing area regulating means, an instantaneous pressure drop of the ventilating air in said predetermined direction of flow, and operating means for each flowing area regulating means;
- said operating means, in connection with registration of a predetermined lowest pressure drop for the ventilating air over said measuring spot, being adapted to actuate the adherent area regulating means to block the flowing area of the ventilating air past said measuring spot.
Dependencies are inferred from the claim text.