Spiral-shaped separation device for fluid purification device

A method of separating a fluid containing liquid, gas and solids, the method being performed by a separation device comprising at least three concentric enclosures including an outermost enclosure and an innermost enclosure, and defining at least two concentric cavities;

• a plurality of spiral-shaped walls extending between two of the at least three concentric enclosures such that each of the plurality of spiral-shaped walls forms a horizontal angle with a radial line of the at least three concentric enclosures, wherein the horizontal angle is not zero;
• a plurality of enclosed spiral-shaped channels formed in each of the at least two concentric channels wherein each of the plurality of spiral-shaped channels is enclosed by two of the plurality of spiral-shaped walls and two of the at least three concentric enclosures, the method comprising the steps of:
• receiving a fluid through an upper section of an outermost cavity among the at least two concentric cavities;
• allowing the fluid to flow downwards through the plurality of enclosed spiral-shaped channels of the outermost cavity and allowing gas contained in the fluid to move upwards through the plurality of enclosed spiral-shaped channels of the outermost cavity and to leave the separation device through the upper section of the outermost cavity;
• when the fluid reaches a redirecting chamber located below the outermost cavity, allowing the fluid to switch from a downward flow through the plurality of enclosed spiral-shaped channels of the outermost cavity, to an upward flow through the plurality of enclosed spiral-shaped channels of at least one inner cavity and, when reaching an upper section of the at least one inner cavity converted into liquid, allowing the liquid to leave the separation device, wherein each of the plurality of enclosed spiral-shaped channels includes an opening width of at least 25 millimetres;
• and
• allowing solids to move downwards through the plurality of enclosed spiral-shaped channels of the outermost cavity and through the plurality of enclosed spiral-shaped channels of the at least one inner cavity and to leave the separation device through a lower section of the separation device.