Dosing device and method for operating a dosing device
First Claim
1. A dosing device with a dosing chamber unit receiving dosing fluid and actively ejecting dosing fluid, the dosing chamber unit including at least one dosing chamber, an inflow channel which fluidically connects a dosing chamber with an inlet and which opens in an inflow orifice into the dosing chamber, and a backflow channel which fluidically connects the dosing chamber with a backflow orifice in which a backflow proceeds from the associated dosing chamber, wherein the inflow orifice and the backflow orifice are spaced from each other, wherein the inflow channel and a backflow channel have different flow resistances and/or flow resistances dependent on the flow direction, so that a specified one way flow is obtained in the inflow channel and an opposite specified one way flow is obtained in the backflow channel, and a 3-way valve which has a port for the inflow, a port for the backflow, and a common port for the inflow channel and the backflow channel.
1 Assignment
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Accused Products
Abstract
A dosing device with a dosing chamber unit receiving dosing fluid and actively ejecting dosing fluid, which includes at least one dosing chamber, an inflow channel which fluidically connects a dosing chamber with an inlet and in an inflow orifice opens into the dosing chamber, and a backflow channel which fluidically connects the or a dosing chamber with a backflow and which in a backflow orifice proceeds from the associated dosing chamber, is able to exactly eject minimum amounts of fluid. Inflow and backflow orifice are spaced from each other. A 3-way valve is provided with a common port for the inflow and the backflow channel.
10 Citations
19 Claims
- 1. A dosing device with a dosing chamber unit receiving dosing fluid and actively ejecting dosing fluid, the dosing chamber unit including at least one dosing chamber, an inflow channel which fluidically connects a dosing chamber with an inlet and which opens in an inflow orifice into the dosing chamber, and a backflow channel which fluidically connects the dosing chamber with a backflow orifice in which a backflow proceeds from the associated dosing chamber, wherein the inflow orifice and the backflow orifice are spaced from each other, wherein the inflow channel and a backflow channel have different flow resistances and/or flow resistances dependent on the flow direction, so that a specified one way flow is obtained in the inflow channel and an opposite specified one way flow is obtained in the backflow channel, and a 3-way valve which has a port for the inflow, a port for the backflow, and a common port for the inflow channel and the backflow channel.
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19. A dosing device with a dosing chamber unit receiving dosing fluid and actively ejecting dosing fluid, dosing chamber unit including at least one dosing chamber, an inflow channel which fluidically connects a dosing chamber with an inlet and which opens in an inflow orifice into the dosing chamber, and a backflow channel which fluidically connects the dosing chamber or a dosing chamber with a backflow orifice in which a backflow proceeds from the associated dosing chamber, wherein inflow orifice and backflow orifice are spaced from each other, and a 3-way valve which has a port for the inflow, a port for the backflow, and a common port for the inflow channel and the backflow channel,
wherein the dosing device comprises several dosing chambers connected in series with each other by at least one connecting channel and the inflow channel of a second dosing chamber fluidically connects a first dosing chamber with the inlet of the second dosing chamber and the backflow channel of the last in series dosing chamber connects a last dosing chamber in flow direction with the backflow, wherein several diaphragm pumps with dosing chambers and associated pump chambers are present, and wherein the at least one dosing chamber is part of a diaphragm pump, with a diaphragm which separates the dosing chamber from an opposed pump chamber, and wherein the diaphragm pumps in comparison with each other have different maximum pumping volumes, and a controller is provided, which actuates the diaphragm pumps, wherein the controller is designed such that the diaphragm pumps are actuated in groups or individually at a same time in a same direction or in opposite directions, offset in time relative to each other, in order to eject a dosed fluid volume which is a differential volume of the pumping volumes of several diaphragm pumps.
Specification