Patent ID: 9422926
Filing Date: 2016-08-23
CPC Classification: B01D,B04C,F04B

Claim Text:
1. A pump device, comprising: a positive-displacement pump; a cyclone filter operably coupled to the positive-displacement pump, the cyclone filter being provided on an intake side of the positive-displacement pump; and a non-positive-displacement pump operably coupled to the cyclone filter, the non-positive displacement pump being provided on an intake side of the cyclone filter, wherein: the cyclone filter comprises a primary cyclone and secondary cyclones, each of the primary cyclone and the secondary cyclones expels therein separated foreign substances, the secondary cyclones are arranged at outward positions in a radial direction of the primary cyclone, a secondary non-positive-displacement pump is arranged in a space through which an outflow of the primary cyclone and an intake of the secondary cyclone communicate with each other so that a coolant forms a flow directing outwards in the radial direction of the primary cyclone when the secondary non-positive-displacement pump rotates, a discharge rate of the non-positive-displacement pump is set higher than a discharge rate of the positive-displacement pump, and the positive-displacement pump, the cyclone filter, and the non-positive-displacement pump are linearly arranged in the vertical direction.