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    • 31. 发明授权
    • Dispensing pump having no check valves
    • 无止回阀的点胶泵
    • US4139122A
    • 1979-02-13
    • US792262
    • 1977-04-29
    • Peter Bauer
    • Peter Bauer
    • B05B11/00G01F11/02B67D5/42
    • B05B11/3004B05B11/0056B05B11/3001B05B11/3011B05B11/3015B05B11/3074B05B11/3076G01F11/028
    • A dispensing pump having no check valves includes upper and lower mechanically-joined pistons which are moveable together through respective upper and lower cylinders. As the pistons are moved in one direction toward a rest position the cylinders are initially pressure-isolated and the upper piston aspirates spray liquid into the upper cylinder while the lower piston aspirates air into the lower cylinder. Before reaching the rest position the pistons unblock flow communication between the cylinders to permit liquid from the upper cylinder to fall into the lower cylinder. During movement of the pistons in the opposite direction the cylinders are again pressure-isolated and the lower piston forces liquid from the lower cylinder through a spray outlet under high pressure.
    • 没有止回阀的分配泵包括上和下机械连接的活塞,它们可以通过相应的上部和下部气缸一起移动。 当活塞沿着一个方向移动到静止位置时,气缸最初被隔离并且上部活塞将喷射液体吸入上部气缸,同时下部活塞将空气吸入下部气缸。 在到达静止位置之前,活塞解除气缸之间的流动连通,以允许来自上部气缸的液体落入下部气缸。 在活塞在相反方向移动期间,气缸再次被隔离并且下活塞通过高压下的喷射出口迫使来自下部气缸的液体。