Unsynchronized phase operation of peristaltic pump rollers

A peristaltic fluid pump having a suction side and a pumping side, and comprising:

• a pump housing having a mainly arcuate support surface,
• a flexible tube extending along the support surface,
• a rotor having two opposite rollers for during operation rolling over the flexible tube along an entrance section where the tube successively is compressed, a pumping section extending across an angle having an arc of less than 180°, and an exit section where the compression successively is ended, whereby the entrance and exit sections include an idling zone that does not provide a pumping action, and a pumping zone that does provide a pumping action, and
• means for rotating the rotor during operation,
• wherein the arcuate support surface is constructed in such a way that the two opposite rollers do not operate in synchronous phase opposition during operation, and both the entrance section end and the exit section have an arc length χ;δ of between 110° and 50°.

A peristaltic fluid pump having a suction side and a pumping side, and comprising:

• a pump housing having a mainly arcuate support surface,
• a flexible tube extending along the support surface,
• a rotor having two opposite rollers for during operation rolling over the flexible tube along an entrance section where the tube successively is compressed, a pumping section extending across an angle having an arc of less than 180°, and an exit section where the compression successively is ended, whereby the entrance and exit sections include an idling zone that does not provide a pumping action, and a pumping zone that does provide a pumping action,
• pressure means for elastically pressing against the tube outside of the engagement of the rollers to maintain the tube in a predetermined shape, and
• means for rotating the rotor during operation,
• wherein the arcuate support surface is constructed in such a way that the two opposite rollers do not operate in synchronous phase opposition during operation, and the entrance section end and the exit section beginning are arranged at an angle that is smaller than 180°.