| 摘要 |
<p>The invention relates to a manual, self-priming precompression spray pump (100), which employs a minimal number of different parts. The entire assembly (100) includes a container for the liquid which is to be dispensed, a cap (120) for closing the open end of the container, a conventional spray nozzle unit (104), a valve member (400), a piston (600), a spring (700) and a cylinder (500) for housing the piston (600) and providing a compression chamber (516). The valve upper end functions as an outlet valve (402) and the valve lower end functions as an inlet valve (414). The spring (700) is a compound spring and serves two, independently variable functions. It serves both to force the valve outlet end (402) into a constant sealing engagement with the interior of the piston (600), and to resist the compression movement of the piston (600). The compound spring (700) has one end seated on the seat (510), which is formed where the inner concentric valve cylinder (504) is joined to the outer cylinder (500), the piston housing cylinder (500).</p> |
