| 摘要 |
A reciprocating pump or compressor has an alignment adapter for providing a self-aligning piston rod. The alignment adapter and a clamp couple the piston rod to a crosshead extension rod. The alignment adapter provides compensation for misalignment of the longitudinal axis of the crosshead extension rod with the longitudinal axis of the piston rod. The alignment adapter has a hemispherical cavity, and the piston rod has a hemispherical projection that matingly fits within the hemispherical cavity. A split ring is received in a groove in the piston rod, and the piston rod and the split ring are received in the cavity in the alignment adapter for use in coupling the piston rod to the alignment adapter. A piston head has a hemispherical cavity for receiving a hemispherical projection on a piston rod. The piston head has a longitudinal midpoint, and the hemispherical projection has a focal point for a radius of curvature. The focal point is located forward of the midpoint so that the piston rod tends to pull the piston head, which allows the piston head to align within a piston cylinder. |
