초록 ▼

The invention relates to a dispensing device and a method for dispensing liquids, preferably reagents, in an essentially automated and finely dosed manner. The dispensing device comprises a first duct that is connected to a storage element for storing the liquid to be dispensed. In addition, a conve

The invention relates to a dispensing device and a method for dispensing liquids, preferably reagents, in an essentially automated and finely dosed manner. The dispensing device comprises a first duct that is connected to a storage element for storing the liquid to be dispensed. In addition, a conveying element for conveying the liquid through the fist duct is provided, whereby the liquid has to be dispensed. Liquid is transported from the storage element and is conveyed into the first duct by the conveying element. Moreover, the dispensing device is provided with a closing device that is arranged downstream in the conveying direction of the liquid in relation to the conveying element and serves for quickly closing and quickly opening the first duct. The aim of the invention is to regulate the pressure of the liquid in the region between the conveying element and the closing device. A device for regulating the pressure of the liquid in this region is provided. Liquids can be very exactly and repeatedly dispensed in short time intervals by means of the inventive device and the inventive method. In another embodiment of the invention, a dispensing element is provided for evenly dividing the liquid stream into partial streams.

대표청구항 ▼

1. A dispenser for the substantially automated and finely metered dispensing of liquids, the dispenser comprising:a first line; a conveying element for conveying the liquid which is to be dispensed through the first line, wherein the liquid is transported out of the storage element by the conveying

1. A dispenser for the substantially automated and finely metered dispensing of liquids, the dispenser comprising:a first line; a conveying element for conveying the liquid which is to be dispensed through the first line, wherein the liquid is transported out of the storage element by the conveying element and conveyed into the first line, wherein the conveying element is connected to the storage element by means of a second line and the end of the second line proximal to the storage element is movable in the direction of the immersion in the liquid in the storage element; a closure device for the rapid closing and rapid opening of the first line, the closure device being located downstream of the conveying element in the direction of travel of the liquid; a device for regulating the pressure of the liquid in the area between the conveying element and the closure device, the device comprising a third line which branches off the first line, as well as a pressure valve for opening and closing the third line, wherein the third line opens into the second line upstream of the conveying element in the direction of travel of the liquid. 2. The dispenser according to claim 1, wherein the conveying element is a pump.3. The dispenser according to claim 2, wherein the pump is a diaphragm pump.4. The dispenser according to claim 1, further comprising an aspiration needle on the end of the second line proximal to the storage element.5. The dispenser according to claim 4, wherein a liquid sensor for determining and regulating the depth of immersion in the liquid of the storage element is provided on the end of the second line proximal to the storage element.6. The dispenser according to claim 5, wherein the end of the second line proximal to the storage element is automatically movable to another storage element or the storage element is automatically replaceable by another storage element.7. The dispenser according to claim 6, wherein the pressure of the liquid in the region between the conveying element and the closure device is regulated, by means of the device for regulating the pressure, so as not to exceed a threshold value.8. The dispenser according to claim 7, wherein a dispensing element with at least one inlet opening and at least one outlet opening is provided on the end of the first line downstream of the conveying element.9. The dispenser according to claim 8, wherein the dispensing element is constructed as a dispensing head with automated movement.10. The dispenser according to claim 8, wherein the dispensing element is automatically replaceable.11. The dispenser according to claim 10, wherein the direction of conveying of the conveying element is reversible.12. The dispenser according to claim 1, wherein the opening and closing cycle of the closing device can be controlled by a microprocessor.13. The dispenser according to claim 12, wherein the lines are made from a plastic that is easily bendable.14. The dispenser according to claim 13, wherein the dispensing element dispenses the liquid into one or more collecting containers.15. The dispenser according to claim 14, wherein the dispensing element further comprises an inlet opening and at least two outlet openings; a first and a second transverse channel for distributing the liquid which is to be dispensed; and at least two supply channels between the first and second transverse channels.16. The dispenser according to claim 15, wherein the dispensing element has eight outlet openings.17. The dispenser according to claim 15, wherein the dispenser has twelve outlet openings.18. The dispenser according claim 15, wherein an inlet channel downstream of the inlet opening runs substantially perpendicularly to the first transverse channel.19. The dispenser according to claim 18, wherein the supply channels run substantially perpendicularly to the first and second transverse channels.20. The dispenser according to claim 19, wherein outlet channels leading to the outlet openings run substantially perpendicularly to the second transverse channel.21. The dispenser according to claim 20, wherein the first transverse channel extends on the same level as the second transverse channel.22. The dispenser according to claim 20, wherein the first transverse channel extends underneath the second transverse channel.23. The dispenser according to claim 22, wherein the supply channels supply outlet openings with liquid to be dispensed, wherein two outlet openings are provided for each supply channel.24. The dispenser according to claim 23, wherein the transverse channels are connected by additional flushing channels.25. The dispenser according to claim 24, wherein additional transverse channels are provided.26. The dispenser according to claim 25, wherein the diameter of the flushing channels is smaller than the diameter of the supply channels.27. The dispenser according to claim 26, wherein the diameter of the supply channels is less than the diameter of the transverse channels.28. The dispenser according to claim 27, wherein the flow resistance along the channels between the inlet opening and the outlet openings is substantially equal.29. The dispenser according to claim 28, wherein the dispensing element further comprisesan inlet opening and at least two outlet openings; a first and a second pressure stage for equalizing the pressure within the pressure stage in question; and at least two supply channels between the two pressure stages. 30. The dispenser according to claim 1, wherein the closure device is a solenoid.31. A process for the substantially automated, finely metered dispensing of liquids, the process comprising the following steps:a) automatically moving one end of a pipe system so that the pipe system communicates with a selected storage container; b) transporting the liquid out of the storage container into the pipe system; c) building up a pressure which is substantially constant over time in the liquid in at least one section of the pipe system, wherein the liquid is continuously conveyed by means of a pump in order to build up the pressure, and wherein the pressure is limited on the pump delivery side by recycling of the liquid; and d) metering the quantity of liquid to be dispensed by briefly opening a rapid closure device arranged in the pipe system, so that a quantity of liquid corresponding to the duration of opening of the rapid closure device and the liquid pressure is dispensed from the section of the pipe system. 32. The process according to claim 31, wherein step c) of the process further comprises the step of limiting the pressure on the pump delivery side by pressure-controlled recycling of the liquid.33. The process according to claim 32, wherein step c) of the process is repeated several times in succession.34. The process according to claim 33, wherein before step c) of the process the distal end of the pipe system in relation to the storage element is automatically moved so that the metered quantity of liquid is dispensed into one or more selected containers.35. The process according to claim 31, wherein the containers into which the metered liquid is dispensed are moved in a controlled manner before step c) of the process.36. The process according to claim 31, wherein when a maximum pressure is exceeded in the pipe system the liquid is recycled into the storage element.37. The process according to claim 31, wherein when a maximum pressure is exceeded in the pipe system the liquid is recycled into a part of the pipe system situated in front of the pump.38. The process according to claim 31, wherein after the end of the dispensing of the liquid the pipe system is washed with a washing liquid.