Ventilation device for rise straight-tube of vacuum water drainage system

Abstract

A vacuum drainage system (12) having a vertical riser (16) with an aeration point (10,30). The aeration point prevents stalls in the vacuum drainage system by breaking up the formation of a solid fluid column in the riser (16). In certain applications, the aeration point allows the vacuum drainage system to operate in a deliberately flooded condition by regulating air flow into the riser. The aeration point (10,30) may be provided simply as a hole positioned at an optimum height (H) above a bottom of the riser, or it may include apparatus (10,30) for retaining fluid inside the riser (16), such as a check valve. In addition, the aeration point (10,30) may be provided with an automatically adjustable cross-section, so that the aeration point is quickly and easily adapted to changing operating parameters in the vacuum drainage system.

Description

technical field [0001] In general terms, the present invention relates to fluid drainage systems, more precisely vacuum drainage systems. Background technique [0002] Various types of drainage systems are used to transport sewage from its source to the required collection point. For example, gravity drainage systems use the force of gravity to move sewage. Such systems have a number of disadvantages, such as limited options for gravity drainage piping arrangements since the piping must be lower than the sewage source and slope continuously towards the collection point. Since the source of sewage is often located on the concrete deck, the piping must be installed before the cement is poured. In addition, due to the limitation of the location of the pipeline, it is very difficult to modify the gravity pipeline system and add pipeline devices, and personnel are often transferred during pipeline reconstruction, resulting in loss of working time. [0003] Vacuum drainage syst...

AI Technical Summary

Problems solved by technology

The vacuum source connected to the main vacuum line is typically designed for a specific riser lift height and water slug size, so it is often not possible to lift solids out of the riser

The result is that the vacuum drainage system is clogged, unable to accept additional sewage, and the sewage may return through the riser, causing sewage to flood the surrounding area

The only solution known to prevent clogging is to select a higher volume vacuum source, which is expensive and unnecessary in normal operation

Also, lifting solids beyond a certain height would exceed the ability of any type of vacuum source, so the problem of clogging cannot be solved

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