Importance

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Abstract

A dual phase difference pump 100 that can reduce the pulsation of a discharge pressure as much as possible. The dual phase difference pump 100 includes, in series, two gear pump units 1, 2 each including a pair of gears 4, 5 configured to mesh with each other. Shafts 42 of the gear pump units 1, 2 are coupled to each other by using a coupler 6. The pair of gears 4, 5 mesh with each other without backlash. The coupler 6 is configured to couple the shafts 42 to each other at any one of a plurality of predetermined phase angles, and is configured to make a phase difference between the gear pump units 1, 2 equal irrespective of which predetermined phase angle is selected among the plurality of predetermined phase angles as a phase angle at which the shafts 42 are coupled to each other.

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First Claim