Patent ID: 8382451
Filing Date: 2013-02-26
Classification: F04B

Abstract:
1. A pump apparatus comprising: a body having a port through which a fluid is drawn in and discharged, and a pump chamber communicating with the port; a displacement mechanism having a displacement body disposed in an interior portion of the body and which is displaceable along an axial direction; a driving member disposed at an end of the body and which displaces the displacement mechanism along the axial direction upon being energized electrically; a bellows interposed between the displacement body and the body; an indirect medium made up from an incompressible fluid and which is filled in a filling chamber of the body and in the bellows that communicates with the filling chamber; and a diaphragm disposed in the interior of the body between the pump chamber and the indirect medium, wherein the diaphragm discharges the fluid inside the pump chamber upon displacement of the displacement mechanism, wherein the pump chamber comprises: