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    • 6. 发明授权
    • Precompression pump sprayer having suck-back feature
    • 具有吸回功能的预压泵喷雾器
    • US5785208A
    • 1998-07-28
    • US630351
    • 1996-04-10
    • Douglas B. DobbsR. Pat Grogan
    • Douglas B. DobbsR. Pat Grogan
    • B65D83/44B05B11/00B05B15/02B67D1/08
    • B05B11/3053B05B11/3018B05B11/3097B05B15/0208
    • A precompression pump sprayer has a variable volume suck-back chamber in communication with the discharge orifice for inwardly suctioning any residual liquid away from the orifice and the spin mechanics to avoid clogging as a result of dried accumulated product. In one embodiment a cover on the plunger head is spring loaded and therewith defines the suck-back chamber. In another embodiment the plunger head is spring loaded on the piston stem, such that in both embodiments a top end wall of the suck-back chamber is shiftable relative to the piston stem independently of piston reciprocation. The biasing spring has a spring force permitting a shifting of the end wall to reduce the volume of the suck-back chamber at a peak pressure reached in the pump chamber beyond the threshold pressure required to open the discharge valve, at which time the spring is compressed. The restoring force of the spring causes the top end wall to shift to expand the volume of the suck-back chamber.
    • 预压泵喷雾器具有与排放孔连通的可变容积的吸回腔,用于向内吸引离开孔和旋转机构的任何残余液体,以避免由于干燥的积聚产物而导致的堵塞。 在一个实施例中,柱塞头上的盖子是弹簧加载的,并且由此限定了回吸室。 在另一个实施例中,柱塞头弹簧加载在活塞杆上,使得在两个实施例中,独立于活塞往复运动,吸回腔的顶端壁可相对于活塞杆移动。 偏置弹簧具有允许端壁移动的弹簧力,以在泵室内达到的峰值压力下减小吸回腔的体积,超过打开排出阀所需的阈值压力,此时弹簧为 压缩 弹簧的恢复力使顶端壁移动以扩大吸回腔的体积。