VERFAHREN UND VORRICHTUNG ZUM DOSIEREN EINES ADDITIVS BEIM SAMMELN EINER FLÜSSIGKEIT

摘要

PCT No. PCT/SE92/00048 Sec. 371 Date Jul. 27, 1993 Sec. 102(e) Date Jul. 27, 1993 PCT Filed Oct. 22, 1993 PCT Pub. No. WO92/13582 PCT Pub. Date Aug. 20, 1992.A method and a device designed to suck and to convey various types of liquids through a suction hose (45) and at the same time does (4) an additive to the liquid in an accurate proportion to the amount of the sucked liquid. A liquid or a liquid/air/gas mixture is sucked by means of a suction nozzle (2,45), which is influenced by a certain pressure P2 with a moderate suction action, and is passed through the suction hose (45). A dosage device (4), which includes a flexible dosage container (20), which is enclosed in a rigid casing (21), and which is influenced by a certain relatively lower pressure P3 (providing a stronger suction action) than the pressure in the suction hose (45), is connected directly to the suction hose (45). The pressure gradient P2-P3 is adjusted in such a way that no additive is introduced when only air/gas is sucked through the suction hose (45), whereas an additive does flow into the suction hose (45) as soon as some amount of liquid is sucked through the suction hose, and the amount of dosed additive is proportional to the amount of sucked liquid. The suction hose (45) may be connected to a separation and defoaming filter (3), which in its turn may be connected to a de-air receiver (5) with a mechanism designed to de-air the sucked liquid as well as to store the liquid without any admixture of gas/air.