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US 4,230,570 AGranted
Aerator
AssigneeNational Research Development Corporation
InventorStephen J. Irving
Life of this patent
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AssigneeNational Research Development Corporation
InventorStephen J. Irving
Estimating the term…
An aerator for the treatment of liquid by immersion in the liquid to form in the liquid a liquid stream and introduced gas bubbles. The stream is to be produced with efficient use of power to have sufficient bubbles small enough to avoid waste by bubbles reaching the surface too quickly. The aerator has a pressure chamber (49), with a liquid inlet and gas inlets (422) positioned between the liquid inlet and a restricted outlet throat (47) associated with a chamber wall surface (44) arranged to direct an outlet stream deflected from the liquid inlet direction. The aerator can be formed without immersed moving parts by two tubes, a smaller inner one (41) expanding toward an outer larger one (42) to define the throat and pressure chamber and wall surface. The gas supply is applied through holes large enough to resist algal obstruction at a position where the gas and water enter a part of the pressure chamber of reducing cross-section for subsequent deflection out of the throat.
An aerator apparatus including an aerator body having a pressure chamber, said pressure chamber having at one end thereof a first inlet for receiving a forced liquid along a selected direction, a wall opposite said first inlet, said wall being directed obliquely to said first inlet direction, a second inlet for a gas disposed between said first inlet and said opposite wall, a restricted chamber throat outlet fixedly directed away from the direction of said first inlet in the line of said oblique wall, the path between said first inlet and said throat outlet being unobstructed, the arrangement being such that liquid and gas supplied to the aerator produce a chamber outlet stream deflected from the first inlet direction of liquid and gas introduced therein to form bubbles in the outlet stream.
An aerator apparatus including an aerator body having a pressure chamber with a first inlet for a forced liquid, a wall in said pressure chamber opposite said first inlet and directed obliquely to said first inlet direction, a second inlet for a gas disposed between said first inlet and said opposite wall, a restricted chamber throat outlet fixedly directed away from the direction of said first inlet in the line of said oblique wall, the arrangement being such that liquid and gas supplied to the aerator produce a chamber outlet stream deflected from the first inlet direction of liquid and gas introduced therein to form bubbles in the outward stream, said apparatus further including two tubes of different diameter, a smaller one of said tubes disposed inside the larger one and along the longitudinal axis thereof, said smaller tube expanding toward the larger one adjacent one end thereof to provide a directed wall surface to define said throat outlet, said second inlet for the gas being in the region of the expansion of said smaller tube and said first inlet for the liquid being along the space between the tubes toward said throat outlet, said smaller tube expanding as a flare at least to the larger tube and said larger tube having an end formed to cooperate with the flare.
An aerator apparatus including an aerator body having a pressure chamber with a first inlet for a forced liquid, a wall opposite said first inlet and directed obliquely to said first inlet direction, a second inlet for a gas disposed between said first inlet and said opposite wall, a restricted chamber throat outlet fixedly directed away from the direction of said first inlet in the line of said oblique wall, the arrangement being such that liquid and gas supplied to the aerator produce a chamber outlet stream deflected from said first inlet direction of liquid and gas introduced therein to form bubbles in the outlet stream, said apparatus including a double-walled vessel defining a core portion open at what, in operation of the device, will be the lower end of the core portion, an annular chamber surrounding the core portion, a shaped discharge outlet at what, in operation of the device, will be the lower end of the annular chamber, first inlet means for introducing a liquid flow at what, in operation of the device, will be the upper end of the annular chamber, and a second inlet means for introducing gas into a region of the annular chamber spaced from said upper and lower ends of the chamber, the shaped discharge outlet having a surface effective in operation of the device to encourage fluid leaving the outlet to flow away from the core portion of the device whereby, in operation of the device to aerate a liquid, a liquid/gas mixture discharge from the outlet will tend to circulate through a substantial part of the liquid in which the device is immersed in response to a circulatory flow of said liquid upwardly through the core portion of the device and subsequently downwardly through the annular chamber where the gas is introduced into the flow at the second inlet means.
A method of aerating a volume of liquid, including drawing from the volume a supply of liquid, causing the supply of liquid to flow down a conduit into the volume of liquid along a full bore, unobstructed liquid path, causing the liquid flow to be diverted by a surface spaced obliquely across the conduit and restricting the conduit to an outlet throat fixedly directed away from the conduit direction, introducing gas into the liquid flow in the conduit in the region of the outlet throat but upstream of the outlet throat to emerge as a stream of liquid and bubbles of introduced gas with momentum provided by the liquid supply flow and directed by the oblique surface to carry the bubbles downwardly and outwardly in a liquid aerating sense.
Dependencies are inferred from the claim text.