Anti-backward-flow method and system applied to drainage port

Abstract

The invention discloses an anti-backward-flow method applied to a drainage port. The method comprises the steps that an in-well liquid meter and an out-wall liquid meter are used for transmitting collected in-well liquid level information H1 and out-well liquid meter liquid level information H2 to a controller, and the controller is used for controlling action of a control valve according to the relation between the in-well liquid level information H1 and the out-well liquid meter liquid level information H2; when the out-well liquid meter liquid level information H2 is larger than or equal tothe in-well liquid level information H1, an anti-backward-flow program is executed; the control valve operates, a first pneumatic cut-off device is subjected to air inflation, a first water outlet pipe is closed, and natural water connected with the first water outlet pipe or a fluid in a rainwater pipe is prevented from flowing backward into a drainage port well through the first water outlet pipe; when the out-well liquid meter liquid level information H2 is smaller than the in-well liquid level information H1, the anti-backward-flow program exits.

Description

technical field [0001] The invention relates to the field of municipal engineering, in particular to an anti-backflow method and system applied to drains. Background technique [0002] At present, in diversion wells, abandonment wells and interception well systems, the systems are composed of water inlet pipes, outlet pipes and sewage interception pipes, and the devices used to prevent backflow all use gates or weir gates to correspond to the water outlet pipes. Anti-backflow, the power source of the gate valve is electric or hydraulic. However, in reality, electric control has the following problems: 1. Generally, flammable and explosive biogas will be produced in closed pipelines and sewage environments. General electric control devices are prone to explosion and unsafe. Therefore, when using electric control devices It is required that the electronic control part in contact with the biogas must have an explosion-proof function, so the price of the electronic control syst...

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Problems solved by technology

However, in reality, electric control has the following problems: 1. Generally, flammable and explosive biogas will be produced in closed pipelines and sewage environments. General electric control devices are prone to explosion and unsafe. Therefore, when using electric control devices It is required that the electronic control part in contact with the biogas must have an explosion-proof function, so the price of the electronic control system is relatively expensive and the cost is high; The equipment in the wells, abandonment wells or interception wells cannot work normally, resulting in urban waterlogging and other situations; In a day, such an electronic control device that is completely suitable for underwater use will be too redundant and cost too high, and the commonly used IP68-rated electronic control device can be submerged within a few hours, and there are also situations where the capacity is insufficient; 4. The devices of the electronic control system use unsafe voltage, and the high voltage is unsafe and prone to accidents; 5. After the electrical equipment is flooded, it is easy to leak electricity and there is a risk of electric shock; 6. The electronic control equipment (gates, weirs) Upward or downward travel is required during operation, which exposes the urban ground, which affects the urban landscape and traffic, and the excavation area is large during construction; 7. The electric control system uses 380V three-phase electricity, and the municipal power grid cannot supply power, and there is a power supply difficult question

[0003] In particular, for occasions requiring concealed installation, and the power supply and costs of the electronic control system are not easy to solve

There are also certain problems in hydraulic control: the hydraulic station uses high-pressure oil pipes, and the cost of the hydraulic station and high-pressure oil pipes is relatively high; the rupture of high-pressure oil pipes will pollute the environment; after the electrical equipment is flooded, it is easy to leak electricity and there is a risk of electric shock; Gates, weir gates) require upward or downward strokes during operation, exposing the urban ground, affecting the urban landscape and traffic, and the excavation area is large during construction

[0004] In addition to the above-mentioned problems in the equipment used in the existing interception wells, drainage wells or abandonment wells, there are also problems that the sewage and rainwater cannot be accurately diverted and discharged, and there are potential safety hazards, and water from spontaneous combustion water bodies is prone to backflow into the wells body, causing urban waterlogging

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