Fluid actuated fluid extraction system

Abstract

The present invention is concerned with a fluid actuated fluid extraction system, and in particular an airflow actuated gas extraction system which in use is located in an airflow such as a natural flow of wind, and which airflow actuates the system in order to extract fluid such as a gas from a remote location such as the interior of a building, the system comprising a hollow body having at least a pair of concentric annular baffles longitudinally spaced from one another to define an annular flow channel circumscribing the body between the pair of baffles into which an actuating fluid can flow from an exterior of the body, the body further having an intake to permit an exhaust fluid to enter the body longitudinally, wherein one or more of the baffles are profiled to generate a vortex within an upstream portion of the flow channel and to effect propagation of the vortex circumferentially around the channel by means of the coanda effect

1 . A fluid actuated fluid extraction system comprising:
 a hollow body having at least a pair of concentric annular baffles longitudinally spaced from one another to define an annular flow channel circumscribing the body between the pair of baffles into which an actuating fluid can flow from an exterior of the body;   an intake to permit an exhaust fluid to enter the body longitudinally characterized in that one or more of the baffles are profiled to generate a vortex within an upstream portion of the flow channel and to effect propagation of the vortex circumferentially around the channel by means of the coanda effect.   
     
     
         2 . The fluid actuated fluid extraction system of  claim 1 , wherein the annular flow channel is open to an interior volume defined by the body. 
     
     
         3 . The fluid actuated fluid extraction system of  claim 1 , wherein the one or more baffles are profiled such that the vortex rotates in a direction which accelerates the exhaust fluid through the hollow interior of the body. 
     
     
         4 . The fluid actuated fluid extraction system of  claim 1 , wherein the one or more baffles include a lower edge, a throat, and an upper edge, the lower edge having a larger diameter than the upper edge and the throat having a smaller diameter than the upper edge. 
     
     
         5 . The fluid actuated fluid extraction system of  claim 4 , wherein the one or more baffles define a convergent divergent cross section relative to a longitudinal axis, and the baffle converges radially inwardly from the lower edge towards the throat and diverges radially outwardly from the throat towards the upper edge. 
     
     
         6 . The fluid actuated fluid extraction system of  claim 5 , wherein at least a divergent portion of the baffle has a curved profile. 
     
     
         7 . The fluid actuated fluid extraction system of  claim 6 , wherein at least the divergent portion defines a concave curvature with respect to an incident actuating fluid. 
     
     
         8 . The fluid actuated fluid extraction system of  claim 1 , wherein adjacent baffles longitudinally overlap. 
     
     
         9 . The fluid actuated fluid extraction system of  claim 8 , wherein adjacent baffles overlap such that a lower edge of one baffle extends longitudinally beyond the throat of an adjacent baffle. 
     
     
         10 . The fluid actuated fluid extraction system of  claim 1 , wherein adjacent baffles radially overlap. 
     
     
         11 . The fluid actuated fluid extraction system of  claim 1 , wherein the annular flow channel is shaped and dimensioned to accelerate and redirect the actuating fluid as it flows through the annular flow channel from an exterior to an interior of the body. 
     
     
         12 . The fluid actuated fluid extraction system of  claim 1 , further comprising a plurality of baffles defining three annular flow channels. 
     
     
         13 . The A fluid actuated fluid extraction system of  claim 1 , wherein one or more of the baffles further comprise an array of circumferentially arranged apertures to permit fluid to flow from the respective flow channel, through the aperture, to an exterior of the body. 
     
     
         14 . The fluid actuated fluid extraction system of  claim 13 , wherein the apertures are located adjacent the lower edge of the baffle. 
     
     
         15 . The fluid actuated fluid extraction system of  claim 1 , wherein the intake is oriented such that the first fluid enters the body in a substantially longitudinal direction. 
     
     
         16 . The fluid actuated fluid extraction system of  claim 1 , wherein the body comprises a top wall opposite and spaced from the intake. 
     
     
         17 . The fluid actuated fluid extraction system of  claim 16 , wherein the top wall is longitudinally recessed below an upper edge of the uppermost baffle. 
     
     
         18 . The fluid actuated fluid extraction system of  claim 16 , wherein the top wall is recessed below the throat of the uppermost baffle. 
     
     
         19 . The fluid actuated fluid extraction system of  claim 16 , wherein a circumferential gap is provided between an edge of the top wall and an adjacent baffle. 
     
     
         20 . The fluid actuated fluid extraction system of  claim 1 , wherein the body is substantially symmetrical about an axial axis of revolution. 
     
     
         21 . The fluid actuated fluid extraction system of  claim 1 , further comprising a frame securing the baffles relative to one another. 
     
     
         22 . The fluid actuated fluid extraction system of  claim 21 , wherein the frame retains the top wall. 
     
     
         23 . The fluid actuated fluid extraction system of  claim 1 , further comprising a set of fan blades mounted on an interior of the body and operable to draw the exhaust fluid from the exhaust. 
     
     
         24 . The fluid actuated fluid extraction system of  claim 1 , further comprising one or more sensors operable to monitor one or more environmental conditions.