Method and apparatus for cleaning water supply pipes

JP7863388B1Active Publication Date: 2026-05-21CHIYODA CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
CHIYODA CORP
Filing Date
2026-01-16
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

Existing pipe cleaning methods using carbon dioxide and carbon dioxide gas are costly, environmentally impactful, require special equipment, and are inefficient due to batch cleaning processes, with insufficient cleaning effects and challenges in maintaining high flow velocities.

Method used

A method and apparatus utilizing a gas-liquid two-phase flow generated by mixing air and water through a twisted plate configuration, allowing for efficient cleaning of water supply pipes by generating a slug flow without the need for carbon dioxide, reducing environmental impact and costs.

Benefits of technology

The method enables efficient, low-cost cleaning of water supply pipes by preventing backflow and chemical residues, suppressing dust inclusion, and maintaining high flow rates, while simultaneously cleaning branch pipes without additional equipment.

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Abstract

To provide a low-cost and efficient method and apparatus for cleaning water supply pipes, thereby reducing environmental impact. [Solution] A cleaning method for cleaning a water supply pipe 10 includes the steps of: slightly opening a first valve 2 located upstream of the cleaning section L of the water supply pipe 10 to restrict the water flow; closing a second valve 3 located downstream of the first valve 2 in the cleaning section L; introducing a gas-liquid two-phase flow from a cleaning device 6, which mixes water and air that has passed through a filter to produce a gas-liquid two-phase flow, from a first fire hydrant 4 located downstream of the first valve 2; and recovering the gas-liquid two-phase flow from a second fire hydrant 5 located downstream of the first fire hydrant 4.
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