Patent ID: 8366409
Filing Date: 2013-02-05
Classification: F04B

Abstract:
1. A reciprocating pump including a cylinder, a reciprocating member reciprocating in the cylinder, and a pumping chamber provided at the leading end of the cylinder, the pumping chamber producing a pumping action, the reciprocating pump comprising: a first manifold having the pumping chamber; a second manifold that has the cylinder communicating with the pumping chamber and that is connected to the first manifold; a cylindrical communicating tube that extends over both the first manifold and the second manifold so as to constitute a part of the cylinder; a first O-ring disposed between the first manifold and the periphery, adjacent to the first manifold, of the communicating tube; a second O-ring disposed between the second manifold and the periphery, adjacent to the second manifold, of the communicating tube; an auxiliary O-ring ( a relief path configured to recycle liquid leaking from at least one of the first and second O-rings from upstream of the auxiliary O-ring to regions in the manifolds under a lower pressure relative to the pumping chamber, the relief path being provided in at least one of the first manifold and the second manifold; and a cylindrical vane case, the leading end, adjacent to the pumping chamber, of the vane case being disposed between the first O-ring and the second O-ring, the vane case being fit on the periphery of the communicating tube, thereby the vane case constituting the leading-end interior of the second manifold.