| 摘要 |
PROBLEM TO BE SOLVED: To forcibly feed water and saliva containing dusts stored in a vacuum main pipe to an air-liquid separation system without affecting a branch system, and automatically clean the vacuum main pipe. SOLUTION: In a vacuum piping system for dental use, a blower 35 to feed the air to generate the air velocity required to carry the stuff stored in a vacuum main pipe 20 is connected to the other end 202 of the vacuum main pipe 20, non-return valves 36A, 36B, etc., to prevent the reverse flow of the air or the like to branch pipes are provided on the branch pipes 22A, 22B, etc., and water and saliva containing dusts stored in the vacuum main pipe 20 is forcibly fed to an air-liquid separator 28 by driving a suction blower 31 and the blower 35 to feed the air of the specified air velocity into the vacuum main pipe 20 from the other end 201 of the vacuum main pipe 20.
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