Device for conveying and dispensing liquid media
AssigneeSiemens Aktiengesellschaft
InventorsAlfred Heinzl, Heinz Stadler
Life of this patent
Estimating the term…
Abstract
A device for conveying and dispensing liquid media such as casting resin has at least one piston pump having a cylinder chamber which forms a seal for a piston therein which is connected via an input opening to a feed container for receiving a supply of liquid therefrom. The cylinder chamber has an output opening and the piston is tubular in form having wall perforations in the region of the input opening for admitting the liquid to the interior of the piston and has a valve at a discharging end thereof for exit of the liquid from the piston. A seal is thus formed by which the piston operates entirely surrounded by the liquid medium to be dispensed and external seals between the piston and the atmosphere are eliminated.
Claims10
A device for conveying and dispensing liquid media containing a granulated filler comprising at least one piston pump having a cylinder chamber and a tubular piston slidably received therein such that an annular gap exists between said cylinder chamber and said piston, said gap being larger than the average size of the particles of said granulated filler, said cylinder chamber having a widened upper portion forming an annular feed zone and having an input opening at a side thereof communicating with a feed container for receiving said liquid media from said feed container and having an output opening for dispensing said liquid media, said piston having a plurality of wall perforations in the region of said input opening for admitting said liquid media to the interior of said piston, and said piston further having an open lower end in the region of said output opening, and an inlet valve for opening and closing said lower end of said piston for admitting said liquid media from the interior of said piston to said output opening, whereby said piston is continuously completely surrounded by said liquid media and is sealed thereby.
Dependencies are inferred from the claim text.