DECOMPRESSION LIQUID PUMPING DEVICE AND LIQUID SPRAYING DEVICE USING THE SAME

PROBLEM TO BE SOLVED: To provide a liquid pumping device of a high pump head largely exceeding a natural height of liquid in a decompressed pipe. SOLUTION: The decompression liquid pumping device pumps up liquid from a liquid source 30 via a liquid pumping pipe 10 to a pumped liquid receiving part 40 arranged at a high position and has a decompression means (50) reducing pressure in the liquid pumping pipe and a gas introduction means 200 introducing a gas of higher pressure than air pressure in the liquid pumping pipe to a position higher than a liquid level and lower than the natural height of a liquid column in the liquid pumping pipe at reduced pressure. In an internal space of the pumped liquid receiving part 40, an upper terminal 10b of the liquid pumping pipe projects from a bottom surface 42 and the upper terminal 10b is arranged apart from an upper surface 44 not to contact with it. The liquid column in the liquid pumping pipe is parted up and down by gas bubbles introduced in the liquid pumping pipe and the upper liquid column which is parted is pushed up by the gas bubbles floating up in the liquid pumping pipe to pump up the liquid. COPYRIGHT: (C)2010,JPO&INPIT