SUCTION DEVICE, SUCTION SYSTEM, AND SUCTION METHOD

摘要

A suction device (10) has an outer tube (36) connected at its base end to a liquid supply section (20) and having an open head section (37), and also has a suction tube (38) placed in the outer tube (36), connected at its base end to a negative pressure generation section (26), and having an open head section (39). An annular liquid supply path (40) is formed between the inner peripheral surface of the outer tube (36) and the outer peripheral surface of the suction tube (38). The open head section (39) of the suction tube (38) is located closer to the base ends than the open head end (37) of the outer tube (36).