IMPROVEMENTS IN OR RELATING TO METHODS AND APPARATUS FOR MIXING LIQUIDS COMPRISING DIFFERENT CONCENTRATIONS OF A SUBSTANCE

摘要

1,245,801. 801. Reciprocating pumps. INTERNATIONAL EQUIPMENT CO. Sept. 9, 1968 [Sept.11, 1967], No.42866/68. Heading F1A. In an apparatus for mixing two liquids having different concentrations of the same substance so as to obtain a liquid having a density gradient, a piston 27 is moved to transfer liquid of one concentration from a cylinder 25 through a conduit 46 to a cylinder 24 in which it is mixed with liquid of a different concentration, the mixture being delivered through an outlet 44 by movement of a piston 26. The pistons are moved at the same or different speeds by screwed shafts 30 having threaded connections with the bases 28 of the pistons. In one modification Fig. 5 (not shown) the cylinders are of different sizes and in another Fig.4 (not shown) only the piston 27 is driven. The shafts 30 are driven through gears 32, 33 or cams and are disconnectable from the bases by spring-controlled worm parts Fig.2 (not shown). A stirrer 42 is provided on the piston 26 and this may be driven directly or through a magnetic coupling Figs.7-9 (not shown).