| 摘要 |
A clog-free spray device for viscous materials is disclosed with a housing providing separate supply chambers for a viscous material and the fluid carrier therefor. A tubular discharge opening communicates directly with the supply chamber for the viscous material and has an inwardly directed resilient tubular wall. A reciprocatable plunger is provided with a hollow portion, one end of which has an inlet opening for the fluid carrier and the other end has an outlet nozzle with a cylindrical outer portion which is engageable in sliding sealed relationship within the tubular wall of the discharge opening to form a peripheral valve closing the viscous material supply chamber. As the plunger is moved toward the fluid carrier supply chamber its inlet communicates with that chamber and the nozzle conveys the fluid carrier alone out the discharge opening. Further movement of the plunger opens the peripheral valve about the nozzle and the viscous material enters the tubular discharge opening from all sides to intermix intimately with the carrier fluid. Reversing the plunger causes the tubular wall to wipe the cylindrical portion of the nozzle clean of viscous material to prevent clogging. In one embodiment an edge of the tubular wall seats in its closed position against a flange on the nozzle to provide both radial and axial sealing surfaces.
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