Peristaltic pump

A peristaltic pump comprising:

• a fixed support;
• a rotor rotatable about a rotor axis on the support;
• a plurality of rollers mounted on the rotor rotatable about respective roller axes angularly equispaced about and radially equispaced from the rotor axis;
• a stator fixedly mounted on the support and formed with a recess having an arcuate floor directed radially inward at the rotor axis and including a main region of constant radius of curvature centered on the rotor axis and an end region of a radius that increases progressively away from the region of constant radius at a uniform rate;
• a tube lying on and extending along the floor and engageable with the rollers, the rollers forming in the tube a series of transfer chambers;
• means including formations on the stator engaging around and capturing the tube for integrating the tube with the stator;
• and
• means for rotating the rotor about the rotor axis and thereby displacing the transfer chambers from the main region where the transfer chambers are of constant volume to the end region where they are of uniformly increasing volume.

A peristaltic pump comprising:

• a fixed support;
• a rotor rotatable about a rotor axis on the support;
• a plurality of rollers mounted on the rotor rotatable about respective roller axes angularly equispaced about and radially equispaced from the rotor axis;
• a stator fixedly mounted on the support and formed with a recess having an arcuate floor directed radially inward at the rotor axis and including a main region of constant radius of curvature centered on the rotor axis and an end region of a radius that increases progressively away from the region of constant radius at a uniform rate;
• a tube lying on and extending along the floor and engageable with the rollers, the rollers forming in the tube a series of transfer chambers;
• interfitting dovetail formations extending radially of the rotor axis on the stator and support;
• and
• means for rotating the rotor about the rotor axis and thereby displacing the transfer chambers from the main region where the transfer chambers are of constant volume to the end region where they are of uniformly increasing volume.