Patent ID: 9079701
Filing Date: 2015-07-14
Classification: B65D,F04B

Abstract:
1. A pneumatic dosing unit, comprising: a multipart housing having a cavity formed between the first housing part and the second housing part; a flexible diaphragm clamped between the first housing part and the second housing part and dividing the cavity into a pump chamber and a dosing chamber that are fluidically separated from each other; at least one feed channel and at least one drain channel in the second housing part leading to the dosing chamber and starting from the dosing chamber, respectively; diaphragm valves in the feed channel and in the drain channel that are spaced apart from the associated pump chamber and the associated dosing chamber, and wherein the diaphragm valves in the feed channel and in the drain channel are controllable via control channels in the first housing part; one of the diaphragm valves being arranged upstream and one of the diaphragm valves being arranged downstream of the feed channel and the drain channel; and the flexible diaphragm and the diaphragm valves being arranged in such a way that dosing fluid does not contact the first housing part, wherein the second housing part is an injection molded part able to be manufactured without cross slides, wherein the second housing part has two opposing end faces, the first housing part facing one of the two opposing end faces, wherein the second housing part having longitudinal channels leading from one end face to an opposite end face and having transverse channels connecting the longitudinal channels, wherein the transverse channels are exclusively formed by an open groove at at least one of the two opposing end faces, and wherein a third housing part is provided adjoining one of the two opposing end faces of the second housing part which is opposite to the flexible diaphragm, the third housing part being fluidically separated from the dosing-fluid receiving channels in the second housing part by an elastic seal.