Project background:

Application background of indoor vacuum blowdown Technology

There are many problems if apply the traditional gravity drainage method in the new large space, long-apan and large-scale underground buildings:

  • The slope of the pipeline affects the indoor floor height, thus hinders the space utilization and decoration effect

  • Increase of civil structure cost caused by sewage lifting

  • The pipe diameter is enlarged step by step to reduce the flow rate and cause impurities to accumulate and block

  • Structural beams and columns, professional pipelines and other restrictions on the direction of drainage pipes

  • Health and safety problems caused by leakage caused by defects of pipe and construction quality

  • Underground civil air defense space is used, no holes are allowed, and gravity flow pipelines cannot be arranged

  • The gravity flow in the underground space is easy to cause the problems of poor drainage, full of odor, and the breeding of flies and mosquitoes

  • For the reconstruction of existing buildings, gravity flow is difficult to expand, construction is difficult, investment is high, and the period is long

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Indoor vacuum blowdown system

The vacuum drainage system of Juchuan is formed by vacuum pump in the closed drainage pipe network. Through the vacuum diaphragm valve in each collection lifter, the pressure difference generated by vacuum negative pressure is used to realize the sewage flow to the sewage tank, and finally to the municipal sewage pipe network or sewage treatment equipment, which belongs to the pressure flow drainage system.

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Application field of vacuum collection and discharge system

Compared with the traditional gravity drainage system, the vacuum drainage system not only can effectively save water and protect the water environment, but also has the advantages of the pipe network not limited by the terrain, convenient installation, not easy to block, relatively small pipe diameter, good economic performance and so on.

Application of indoor vacuum drainage

  • Fixed space: underground commercial space, subway, environmental toilet, shopping mall / office building, commercial reconstruction, old urban reconstruction.

  • Mobile space: train, high-speed rail, ship, offshore oil drilling platform, container barracks, etc.

Outdoor vacuum drainage application

Water source protection area, rural sewage collection, villa sewage collection, industrial zone sewage collection, river sewage treatment, etc.

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                                              Comparison between vacuum drainage and gravity flow drainage

Comparison program

Traditional gravity sewage system

Vacuum blowdown system


Limited by hydraulic gradient, it is difficult to lift sewage, or it is necessary to lift pumps and structures

Inconvenient design in the same floor drainage design

Vacuum suction, not affected by gravity, can lift sewage at will

Drainage pipeline can be arranged as required, flexible and changeable

Pipe diameter

Large diameter, high cost and large-scale excavation

Slow flow rate and easy scaling

Pipeline laying takes up a large space and cannot bypass obstacles at will

Deep excavation of pipe trench, long construction period, great difficulty and high cost

The vacuum pipe diameter is small, usually 50-200mm, which can be made of PVC or PE with low cost

Fast flow rate, self flushing ability, not easy to scale

The pipeline can be laid flexibly, the direction is not limited by the terrain, and the obstacles can be easily bypassed

Shallow buried depth, small construction earthwork, simple and economic construction

Install and repair

Complicated installation, large quantities of work and imperceptible leakage

The installation is relatively small and the maintenance is simpler. The pipeline is in a vacuum state and there is no leakage of transmission medium

Odor problem

The pipe network system is semi open, with poor sealing performance, odor escaping, breeding mosquitoes and flies

The pipe network is negative pressure and completely closed, and the odor will not escape

Reconstruction of existing buildings

Difficult construction, high investment and long construction period

Easy to expand, easy to construct and short construction period

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Room 404, 4th floor, building 1, wansli technology building, 68 tiancheng road, hangzhou

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