Patent ID: 9157422
Filing Date: 2015-10-13
Classification: B01D,C01B,F04B

Abstract:
1. A reciprocating pump comprising: a motor including a motor shaft; four cylinders disposed at positions offset 90 degrees from each other about the motor shaft, the cylinders having cylinder shaft directions perpendicular to a motor shaft direction; four pistons disposed in the cylinders, respectively, the pistons being configured to be reciprocated by the motor shaft; a casing accommodating the motor shaft; and eight ducts including four intake ducts and four exhaust ducts, gas being introduced into the four cylinders through the four intake ducts and gas being discharged from the four cylinders through the four exhaust ducts, and the eight ducts being disposed in a region surrounded by the four cylinders when viewed along the motor shaft direction, the eight ducts being arranged in four pairs with each pair of two of the eight ducts being disposed between the cylinders adjacent to each other about the motor shaft, the four pairs of two ducts disposed between the cylinders adjacent to each other about the motor shaft extending along the motor shaft direction, each of the eight ducts including a first duct that extends onto a side of the motor shaft from an outside of the region surrounded by the four cylinders when viewed along the motor shaft direction, and each of at least four ducts of the eight ducts including a second duct extending along the motor shaft direction.