| 摘要 |
<p>The pump consists of a housing having at least one cylindrical chamber (14) with an inlet (9) and an outlet (11) for a pumped liquid or gas, a piston with a rod (16) which passes through an aperture (18) in a housing end wall (4) and has one end connected to the piston and the other to a reciprocating drive. The piston rod is surrounded with a clearance by a bellows seal (23) which has one end fixed to the piston rod and the other to the end wall. At least one spacer (28) is fitted to the bellows between its two ends and slides along the rod to maintain a set clearance between the bellows and the rod and prevent the bellows from buckling.</p> |
