Stirring apparatus using magnetically coupled stirring impellers

A stirring apparatus comprising:

• a plurality of vessels each having walls and including:
• a predetermined number of liquid supply ports into which liquid to be stirred is made to flow;
• and
• a liquid exhaust port from which liquid is exhausted after stirring;
• a plurality of stirring impellers separately arranged at at least two positions opposed to each other in said vessels, said plurality of stirring impellers being rotated in directions opposite to each other so that liquid in each of said vessels is stirred;
• external magnets arranged outside the walls of said vessels close to said stirring impellers, said external magnets comprising magnetic couplings having no shafts which penetrate the vessels and are connected to said stirring impellers;
• and
• drive means, arranged outside said vessels, for driving said external magnets so as to rotate said stirring impellers;
• wherein said plurality of vessels are coupled in series in a manner such that said liquid exhaust port of one of said vessels is connected to one of said liquid supply ports of another one of said vessels.

A stirring apparatus comprising:

• a plurality of vessels each having walls and including:
• a predetermined number of liquid supply ports into which liquid to be stirred is made to flow;
• and
• a liquid exhaust port from which liquid is exhausted after stirring;
• a plurality of stirring impellers separately arranged at at least two positions opposed to each other in said vessels, said plurality of stirring impellers being rotated in directions opposite to each other so that liquid in each of said vessels is stirred;
• external magnets arranged outside the walls of said vessels close to said stirring impellers, said external magnets comprising magnetic couplings having no shafts penetrating said vessels and connected to said stirring impellers;
• and
• drive means, arranged outside said vessels, for driving said external magnets so as to rotate said stirring impellers;
• wherein said plurality of vessels are coupled in parallel in a manner such that all the liquid exhaust ports of said vessels are connected into a single liquid discharge port.