| 摘要 |
<p>A liquid supply pump adapted for coupling to a reciprocable motor, particularly for pumping liquids having thermosetting properties. The pump incorporates a double-acting piston ¢35! in a pumping cylinder ¢30!, driven by an elongated drive shaft ¢16! which projects from the top of the pump for reciprocable motion, the pump having a lower intake valve ¢12! and an upper exhaust valve ¢41!, and an intermediate drive shaft seal ¢57! above the pumping cylinder and a liquid and air drive shaft seal ¢64! proximate the point of projection of the drive shaft from the pump, wherein said two seals are spaced apart by a distance greater than the pump stroke length, and a liquid drainage path ¢58! from the intermediate seal back to the pump intake region, and an outer cylinder ¢13! concentrically positioned about the pumping cylinder and enclosing the liquid drainage path.</p> |
