| 摘要 |
A reciprocating pump ( 10 ) for pumping seawater or other fluid under high-pressure. The pump ( 10 ) has a pump body ( 11 ) defining an internal space ( 13 ) and an opening ( 18 ) onto the internal space. A plunger ( 25 ) extends through the opening ( 18 ) and into the internal space ( 13 ). A sheath ( 30 ) closes the opening ( 18 ) and embraces an inner portion of the plunger ( 25 ), whereby pumping chamber ( 33 ) is defined between the pump body ( 11 ) and the sheath ( 30 ). The sheath ( 30 ) is deformable in response to reciprocatory movement of the plunger ( 25 ) to effect volume change within the pumping chamber ( 33 ). The sheath ( 30 ) comprises a first portion ( 31 ) which is generally stable, and a second portion ( 32 ) which embraces the plunger ( 25 ) and which deforms through expansion and contraction upon reciprocatory movement of the plunger. The first portion ( 31 ) defines a mounting flange ( 35 ) clampingly engaged with the pump body ( 11 ). The sheath ( 30 ) incorporates a recess ( 45 ) adjacent the open end thereof. A reinforcement sleeve ( 47 ) is located in the recess ( 45 ), whereby a cavity is defined between the reinforcement sleeve ( 47 ) and the plunger ( 25 ). There is also provision for lubricating the interface between the sheath ( 30 ) and the plunger ( 25 ).
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