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US 6,299,419 B1Granted
Reciprocating diaphragm pump with packless piston-cylinder unit
AssigneeLang Apparatebau GmbH (Lang)
InventorsHerbert Hunklinger, Klaus Rutz
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Abstract
This invention provides a sealing mechanism for sealing the piston-cylinder unit of a reciprocating diaphragm pump to ensure that the piston-cylinder unit is permanently and reliably sealed while being simple to assemble. The invention further provides a piston-cylinder unit which has almost no play in the micrometer (μm) range, and which is sealed by hydrodynamically sealing a slot thereof.
Claims7
A pump for dispensing an accurate dose of a liquid product, said pump comprising:
- a pump housing;
- an inner pump chamber for receiving and containing a liquid product to be dosed;
- a cylinder contained within the housing;
- a dosing piston configured for sliding within said cylinder, said piston forming, in combination with said cylinder, a compression chamber during a stroke cycle of the dosing piston;
- a gap formed between the dosing piston and cylinder, said gap being hydrodynamically sealed by the liquid product occupying the inner pump chamber and the compression chamber;
- a diaphragm connected to said dosing piston, said diaphragm being in contact with the liquid product in said inner pump chamber;
- and
- a control bore formed in the cylinder for providing a fluid connection between the compression chamber and the inner chamber during a stroke cycle of the dosing piston, for permitting the liquid product to flow from the inner chamber into the compression chamber prior to dispensing.
5 more elements
Dependencies are inferred from the claim text.