Novel air bag type water hammer protection device used in water supply pipeline

Abstract

The invention discloses an airbag type pressure protection device for eliminating excessive water hammer pressure in long-distance water supply projects. The exterior of the device is composed of a metal airtight shell, and the interior is composed of an air bag type liner. The metal airtight shell is equipped with an air pressure detection instrument, and a connecting flange and a small section of steel pipe are installed at both ends. The device can be directly installed in the pipeline, and the front and rear can be set. Butterfly valves are used for inspection and maintenance. The device of the present invention is low in cost and easy to install and maintain. On the premise of meeting other adjustment and maintenance requirements, the compression and expansion characteristics of the airbag are used to form a large negative reflection boundary in the pipeline to reflect water hammer waves and change The propagation characteristics of the water hammer wave greatly relieve the water hammer pressure when the valve is adjusted to ensure the stable and safe operation of the water supply system, especially for long-distance gravity flow water supply projects, the effect is more significant.

Description

technical field [0001] The invention relates to the technical field of long-distance water delivery projects, in particular to a long-distance gravity flow water delivery project, which is a structural device for reducing the maximum water hammer pressure in system pipelines. Background technique [0002] Long-distance water transfer projects are one of the effective means to alleviate the uneven temporal and spatial distribution of water resources in my country. However, long-distance water transfer projects have long distances and complex hydraulic conditions. When an emergency occurs, the valve needs to be closed urgently, and water hammer pressure is easily generated in the pipeline. When the pressure exceeds the pipeline pressure standard, the pipeline will be damaged. When the system starts to operate, the negative water hammer generated when the valve is opened will cause the pressure in some parts of the pipeline to drop below the steam pressure, resulting in water c...

AI Technical Summary

Problems solved by technology

In the engineering example, although the air valve has a certain effect on the protection of negative pressure, it is far from solving the problem of water column separation and re-bridging during the accident process, and the air intake of the pipeline also poses a greater threat to the safety of the system

Also, the air valve has no protection against positive pressure

As an effective water hammer protection measure, the air tank has been well used in large and medium-sized pumping station water delivery systems, but it is expensive and complicated to operate and maintain

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