| 摘要 |
PROBLEM TO BE SOLVED: To provide an air lift pipe which eliminates possibility of deformation and cut of a flexible member or separation of a connection part of the flexible member and an air supply part, which is generated by removing stress in inspection and replacement of the air lift pipe.SOLUTION: A guide ring arranged in a periphery of an upper part of an air lift pipe and an air supply part arranged on a lower end part of the air lift pipe are connected by at least two wires, and force of removing the air lift pipe is applied on an upper part and a lower part of the air lift pipe simultaneously. Thus in the air lift pipe, any tensile force in accordance with removal is not applied on a flexible member of the air lift pipe and a connection part of the flexible member and the air supply part. |
