| 摘要 |
PROBLEM TO BE SOLVED: To provide a pump dispenser which discharges water collected in an air chamber and can suppress the deterioration of foam quality.SOLUTION: A pump dispenser 1 includes: a liquid cylinder part 30; a liquid piston part 31; an air cylinder part 14; an air piston part 16; an air supply valve 26; and an air exhaust valve 27, and mixes liquid extruded from the liquid cylinder part 30 and air extruded from the air cylinder part 14 via the air exhaust valve 27 and ejects the mixed liquid and air. Therein, a drain path 33 communicated with a bottom part on the air cylinder part 14 and a drain valve 34 disposed on the drain path 33 are provided on an inner part of the liquid cylinder part 30 and, when an internal pressure of the air cylinder part 14 increases in accordance with a decrease of an inner volume of the air cylinder part 14, the drain valve 34 is opened and, when the internal pressure of the air cylinder part 14 decreases in accordance with an increase of the inner volume of the air cylinder part 14, the drain valve is closed.SELECTED DRAWING: Figure 1 |
