Patent EA-000589-B1 (EA)
Title: Mixing and dispensing device
Inventor: KRAMER HANS
IPC: B65D81/32
Filed: 1997-06-09
Abstract: 1. A mixing device which is suitable for mixing two or more fluid materials; comprising a generally tubular column (1), within the column (1) there being an internal longitudinally aligned core (2), with a space between the column (1) and the core (2) defining a channel (7) which is suitable for the flow of the fluid materials in an overall longitudinal direction through the column (1), the channel (7) having an inlet end (4) and an outlet end (5) for the respective inlet and exit of fluid material into and out of the channel (7), the inner surface of the column (1) which faces the core (2) having one or more fluid guide elements (3) thereon which impart helical flow in a first twist direction upon a fluid flowing longicudinally along the channel (7) from the inlet end (4) to the outlet end (5), and the outer surface of the core (2) which faces the column (I) also having one or more fluid guide elements (6) thereon which impart helical flow in a second twist direction opposite to the first twist direction upon a fluid flowing longitudinally along the channel (7) from the inlet end (4) to the outlet end (5), characterised in that: at part of the channel (7) the helical flow imparted to the fluid is predominantly in the twist direction of the guide elements (6) on the core (2) and at a part of the channel upstream or downstream of this part the helical flow imparted to the fluid flow is predominantly in the twist direction of the guide elements (3) on the column (1). 2. A mixing device according to Claim 1 characterised in that toward the inlet (4) end of the channel (7) the helical flow imparted to the fluid is predominantly in the twist direction of the guide elements (6) on the core (2) and at a part of the channel downstream (5) of the inlet end (4) the helical flow imparted to the fluid flow is predominantly in the twist direction of the guide elements (3) on the column (1). 3. A mixing device according to Claim 1 characterised in that the tubular column (1) is internally generally circular - sectioned, and the core (2) is also externally generally circular-sectioned, with the core (2) coaxially aligned with the tube axis of the column (1). 4. A mixing device according to Claim 1, 2 or 3 characterised in that the said fluid guide elements comprise one or more helical grooves (3) in the surface of the column (1) which faces the core (2), and one or more helical grooves (6) in the surface of the core (2) which faces the column (1), the helical axes of the grooves (3, 6) being generally longitudinal, and the relative twist directions of the helical grooves (3, 6) on the column (1) and core (2) being opposite, the said grooves (3, 6) comprising the channel (7). 5. A mixing device according to Claim 4 characterised in that the depth of the one or more grooves (3) in the column (1) is greater in the vicinity of the outlet end (5) of the column (1) than in the vicinity of the inlet end (4). 6. A mixing device according to Claim 5 characterised in chat the depth of the one or more grooves (6) in the surface of the core (2) is greater in the vicinity of the inlet end (4) of the column (1) than in the vicinity of the outlet end (5). 7. A mixing device according to Claim 4 characterised in that the internal cross section of the column (1) decreases from the inlet end (4) toward the outlet end (5), so that internally the column (1) is wider at the inlet end (4) than at the outlet end (5), and the external cross section of the core (2) decreases in a manner generally corresponding to the internal decrease in internal cross section of the column. 8. A mixing device according to Claim 7 characterised in that the column (1) and core (2) are of a generally frustro - conical shape, with a cone angle for the taper of 1-4 degree . 9. A mixing device according to any one of Claims 1 to 8 characterised in that it is made as a separate nozzle-like extension or adapter for attachment to the outlet passages of a dispenser for two or more fluid materials. 10. A dispensing device for two or more fluid materials incorporating the mixing device according to any one of Claims 1 to 9 such as to mix the fluid materials therein upon dispensing them.