| 摘要 |
FIELD: personal use articles.SUBSTANCE: inventions relate to a liquid dispenser and can be used for pharmaceutical liquids. In the liquid dispenser the feeding device (50) comprises a dosing chamber (60) with a cylindrical wall (62) and a piston (24). The cross section of the piston (24) corresponds to the cross section of the cylindrical wall (62) of the dosing chamber (60), so that the possibility is provided of sliding movement of the piston along the cylindrical wall (62). The dosing chamber (60) and the piston (24) are mounted with the ability of movement relative to each other manually between an initial position and a final position. The dosing chamber (60) has an output side (60b) and an input side (60a). Through the output side (60b), the dosing chamber (60) is connected to the outlet opening (76). Through the input side (60a), the dosing chamber (60) is connected to the reservoir (12) for the liquid. On the output side (60b) the outlet chamber (66) is adjacent to the dosing chamber (60). From the input side (60a) the inlet chamber (64) is adjacent to the dosing chamber (60). The cross section of each of the chambers (64, 66) exceeds the cross section of the piston (24). In the initial position the piston (24) is located in the inlet chamber (64). In the final position the piston is located in the outlet chamber (66). In transition from the initial position to the final position an increase in liquid pressure in the dosing chamber (60) occurs that provides dispensing of the liquid through the outlet opening (76). The reservoir (12) for the liquid is connected to the feeding device (50) through two liquid paths (4, 6). The first liquid path (4) extends from the reservoir (12) for the liquid past the piston (24) into the inlet chamber (64) or the outlet chamber (66). The second liquid path (6) extends from the reservoir (12) for the liquid through the piston (24) into the dosing chamber (60). In the second liquid path (6) an inlet valve (28) is provided, closing at excessive pressure in the dosing chamber (60). The first liquid path (4) is made with the ability of closing when the piston (24) enters the dosing chamber (60) and opening when the piston (24) comes out of the dosing chamber (60) at the opposite end. The outlet head (14) for the liquid dispenser (10) comprises a body (20, 40), having a connecting part for mounting on the reservoir (12) for the liquid. The feeding device (50) has a manual control designed for feeding the liquid from the connecting part to the outlet opening (76).EFFECT: high accuracy of feeding the liquid and ensuring the possibility of obtaining a compact structure.8 cl, 4 dwg |
