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An apparatus for delivering measured liquid volumes comprising a dosing piston pump having an outlet for the measured liquid volumes, and a liquid accumulating device including an accumulator chamber having an inlet for liquid to be dispensed. The accumulator chamber communicates with the pump chamb

An apparatus for delivering measured liquid volumes comprising a dosing piston pump having an outlet for the measured liquid volumes, and a liquid accumulating device including an accumulator chamber having an inlet for liquid to be dispensed. The accumulator chamber communicates with the pump chamber of the dosing piston pump through a transfer passage having a valve for controlling the transfer of liquid from the accumulator chamber to the pump chamber. The accumulator chamber is expandable to accommodate constantly inflowing liquid through the inlet when the transfer passage is blocked and is contractible as a result of the displacement of a movable wall member so as when the transfer passage is open to transfer accumulated liquid to the dosing piston pump while inflowing liquid flows direct to the dosing piston pump.

대표청구항 ▼

Apparatus for repetitively dispensing measured volumes of liquid, comprising: a dosing piston pump having a dosing pump cylinder and a dosing pump piston which is reciprocable in the dosing pump cylinder and defines together with the dosing pump cylinder a dosing pump chamber having an outlet for th

Apparatus for repetitively dispensing measured volumes of liquid, comprising: a dosing piston pump having a dosing pump cylinder and a dosing pump piston which is reciprocable in the dosing pump cylinder and defines together with the dosing pump cylinder a dosing pump chamber having an outlet for the discharge of metered volumes of liquid, an accumulator device including an accumulator receptacle and a movable wall member which is reciprocable in the accumulator receptacle and defines therewith an accumulator chamber having an inlet for liquid to be received into the accumulator chamber, a transfer passage extending between the dosing pump chamber and the accumulator chamber and having associated therewith a transfer valve for controlling the transfer of liquid from the accumulator chamber to the dosing pump chamber, an actuating mechanism for repetitively and positively driving the dosing pump piston at least in the direction corresponding to contraction of the dosing pump chamber, means for contracting the accumulator chamber by displacing the movable wall member of the accumulator device, and valve means arranged between said outlet and said dosing pump chamber for alternately opening and closing to provide for a pulsed delivery of said metered volumes of liquid.