104results about How to "Does not affect drainage" patented technology

The invention discloses an ecological canal for preventing and controlling agricultural area source pollution, which is realized by the following steps: A, constructing an artificial canal for collecting agricultural sewage and farmland surface runoff in a watershed, wherein the canal comprises a sewage runoff inlet and a main canal; B, making the width of the artificial canal between 60 and 240 cm, the depth between 40 and 70 cm, and the length unlimited; C, setting the shape of the canal according to the landform of the watershed; D, setting the sewage inlet of the canal according to the water volume of the sewage and the surface runoff rate in the watershed; and E, making the inlet a trapezoidal open inlet, arranging a physical barrier, a small bio-ball and a sedimentation basin at the inlet, wherein the physical barrier comprises a coarse screen and a fine screen; the two side walls of the main canal are embedded with large bio-balls; emergent plants, floating leaf plants and submerged plants are planted in the canal; and epiphytic algae and floating algae are inoculated in the sewage. The ecological canal for preventing and controlling the agricultural area source pollution is suitable for stopping, degrading, absorbing and utilizing water pollutants in watersheds of mountain region and hill farming areas.

The invention provides a paddy field recession water purification device placed in a ridge of a field. The paddy field recession water purification device is characterized in that a framework of a single water purifying device is constructed by using reinforcing steel bars with the diameter of phi10, plastic plates are arranged at two sides of the framework, steel wire meshes are arranged at the other four faces of the framework, a plastic gate is arranged at the front end of the framework, the interior of the device is partitioned into a part A and a part B by steel wire meshes with fine density, the volume ratio of the part A to the part B is 2: 1, the steel wire mesh of the part A is a high-density steel wire mesh and is filled with bio-filler balls, the steel wire mesh of the part B is a fine-density steel wire mesh and is filled with activated carbon, the front and rear faces of the single water purifying device are designed to be openable, and the single water purifying device or two single water purifying devices are placed in the ridge of a drainage end of the paddy field and are fixed by wood piles. The paddy field recession water purification device has the advantages that the traditional drainage manners that the traditional paddy fields directly drain paddy field recession water through opening gates and the water is not purified are improved, and harmful substances, such as nitrogen, phosphorus, organic substances and hardly-biodegradable pesticide residues, can be effectively trapped from recession water of cultivated field.

The invention discloses a black and odorous river regulating and recovering method which includes the following steps that firstly, dirt stopping and discharging of a river are performed; secondly, desilting of the river is performed; thirdly, paying-off is measured; fourthly, slope surface finishing is performed; fifthly, a plant pad is paved; sixthly, irrigation is performed; seventhly, the river is managed and maintained by manual work for one year. The black and odorous river regulating and recovering method can effectively regulates the conditions that the river is black and odorous and a water body is deteriorated, the quality of water is purified fundamentally, and a novel water body ecological system is formed. In addition, the water body can have self-growing and self-purifying capacities, and the water body can reach the standards of water of the fourth kind. Meanwhile, stability of slope bodies of the two sides of the river and conservation of water and soil are achieved, the environment is effectively renovated, after manual management and maintenance are removed, the functions of the black and odorous river regulating and recovering method can be continued, the functions of discharging dirt, preventing flood, ensuring navigation, draining flood and the like are not affected, and greening and beautifying of the urban landscape can also be effectively enhanced.

The invention belongs to the technical field of municipal drainage pipelines and particularly relates to a discarding catch basin connected with an anti-silting precipitation trash removal pipeline. The discarding catch basin connected with the anti-silting precipitation trash removal pipeline comprises the anti-silting precipitation trash removal pipeline and an discarding catch basin, wherein the anti-silting precipitation trash removal pipeline comprises a rainwater pipeline wall, an impermeable layer, a rainwater pipeline bin, trash cut inclined nets, buffer slopes, precipitable gratings,bottom precipitation ports, high-lift trash removal pumps, silt output pipelines and precipitation desilting grooves; the discarding catch basin comprises a storage and purification tank, a catch basin cover, an activated carbon core filter layer, an oil removal layer, a nonwoven geotextile layer, connecting rods, float balls, a piston slide, slide pistons, discarding water collection control cavity control holes, an discarding water collection control cavity, an discarding down pipe, a drainage pipeline, rainwater pipelines, a water pump and a water pumping pipe. The discarding catch basin purifies, stores and recycles rainwater while the rainwater is drained effectively, so that automatic control of desilting, purification, discarding and storage of the rainwater is realized, and industrialization process and sponge city construction can be promoted.

The invention discloses a fine high-speed railway cross-over tunnel vibration-reducing blasting construction method and relates to an underneath pass section construction scheme of an existing railway tunnel main cave. The method mainly comprising the following two implementation scheme stages: at the first stage, leg-locking reinforcement is conducted on an underneath pass section lining, then a main cave inverted arch is excavated to reach the bottom of a buffer layer, a buffer layer and reinforced concrete access boards are sequentially constructed at an underneath pass section during main cave tunnel bottom karst treatment, and finally inverted arch concreting and filling are constructed; at the second stage, a water drainage tunnel downwards penetrates through the railway tunnel main cave, and a fine vibration-reducing blasting design scheme is adopted for blasting excavation. It is ensured that a tunnel lining structure is safe and ballastless track sedimentation meets the requirements while a water drainage function is achieved and overall construction period requirements are met, and achievement of the overall construction period goal is ensured.

The invention relates to a comprehensive treatment method for repairing the in-situ biological diversity in rivers and lakes, which is characterized in that the bottom sediments in water areas are quickly purified by taking indigenous bacteria from the rives and the lakes and regulating the pH value; the colonization of the original zoological biological diversity is strengthened by utilizing the nutrition preparation of a PU (Polyurethane) hydrolysis bubble film to degrade organic pollutants. The invention has the advantages that foreign ecological strains are not introduced, thus no variety appears, no secondary or micro-pollution nuisance appears; an automatic aerator is not arranged and sludge is not cleaned, thus the operation and maintenance cost and the investment of equipment are greatly reduced, the effect is obvious and good; and the cannel drainage function and the natural purification function are not influenced in the course of treatment and after the treatment.

The invention relates to a municipal drainage ditch with a vegetation planting layer and relates to the technical field of municipal drainage. The municipal drainage ditch comprises a base layer, a municipal drainage pipe, a drainage well, a grid and a filtering net. One end of the filtering net is hinged to the inner side wall of the drainage well; an overflow hole is formed in the drainage well;an impounding reservoir is installed outside the drainage well; the impounding reservoir is located below the overflow hole; an effusion opening is formed in the drainage well; the other end of the filtering net abuts against the upper portion of the effusion opening and extends to the outside of the effusion opening; a driving cylinder is disposed in the base layer; a switch starting device is installed in the impounding reservoir and electrically connected with the driving cylinder; a filtered residue filtering cavity is formed in the base layer and located in the position, at the outer endof the drainage well, below the effusion opening; when the filtering net is opened, one end of the filtering net abuts against a port of the filtered residue filtering cavity; and the filtered residue filtering cavity is located above the municipal drainage pipe and communicates with the municipal drainage pipe. The municipal drainage ditch with the vegetation planting layer has the effects thatthe drainage property of the municipal drainage ditch is improved, and the phenomenon of blocking of an existing drainage ditch is reduced.

The invention discloses an environmental protection device capable of recycling domestic water. The environmental protection device capable of recycling the domestic water includes a main body, filtering nets, pull wires, a motor, a connecting shaft, a smashing device, a sleeving-connecting gear, a baffle, a discharge hole, a discharge opening, a water gathering tank, a filter, a flow guiding pipeand a water guiding pipe. A water tank is embedded in a body wall of one side of the main body, and a water tap is installed on the side, close to the main body, of the water tank; the filtering netsare installed on the other side of the water tank, and the flow guiding plate is connected to the end, away from the water tank, of the filtering nets; and an automatic reset shaft is installed at the end, away from the flow guiding plate, of a connecting rod. The environmental protection device capable of recycling the domestic water is provided with the filtering nets which can intercept fruitpeel and vegetables discharged from the water tank; and the filtering nets are installed under the water tank, when fruits and vegetables are cleaned, the fruit peel and the vegetables can be discarded directly in the water tank and flow directly into the filtering nets with the water flow, the cleaning time is saved, and drainage cannot be affected by the filtering nets.

The invention relates to an ecological protection system for highway cut slopes in a severe cold mountain area. The ecological protection system comprises a fixed protection structure arranged on a slope and a movable protection structure arranged on the fixed protection structure. The fixed protection structure comprises a steplike concrete wall arranged on the slope and anchor rods anchored in the slope, a drainage ditch is formed between the lower end of the concrete wall and a roadbed, and the ends of the anchor rods stretch out from the surface of the concrete wall. The movable protectionstructure comprises gabion bands arranged along the step planes of the concrete wall, the stretching parts of the anchor rods are connected with the gabion bands, the vertical side faces of the concrete wall are provided with a plurality of ribs at intervals, each gabion band is composed of a plurality of gabions, and each gabion is embedded between two adjacent ribs. The protection system can beapplied to the terrain of high slopes and steep slopes in the mountain area and has high resistance to debris flows and ice and freezing failures.

The invention relates to a farmland non-point source pollution control system and method based on biomass charcoal and biomass vinegar. After the biomass charcoal and the biomass vinegar are mixed, amixture is applied to a farmland; nutrient elements including nitrogen, phosphorus and the like, which are adsorbed by the biomass charcoal, can be repeatedly utilized by crops; the biomass charcoal and the biomass vinegar also contain mineral elements which are necessary for the growth of the corps, such as K, Ca, Mg, Zn, Mn and Fe, so that additional nutrient elements can be provided for the crops; meanwhile, after the biomass charcoal is applied to soil, a soil aggregate structure can be improved and the water retention and fertilizer preservation capability of the soil is improved; the utilization rate of fertilizer is improved; meanwhile, the application amount of basic fertilizer is reduced and a positive cycle of farmland pollutant emission reduction-fertilizer synergism-chemical fertilizer application reduction is realized.

The invention relates to the technical field of intelligent well covers, in particular to an intelligent inspection well cover. The intelligent inspection well cover comprises an upper well cover, a functional module and a wireless power supply device; a plurality of functional units are arranged in the functional module, and the functional module is detachably connected with the upper well cover;the wireless power supply device comprises a power supply module and a receiving module, wherein the power supply module is electrically connected with the power supply to receive electric energy andconvert the electric energy into electromagnetic energy to be output to the receiving module; the receiving module receives the electromagnetic energy and converts the electromagnetic energy into electric energy; and the receiving module is electrically connected with the function units. In the prior art, although a sensor is arranged on the well cover to obtain various different data, the sensorneeds to be connected with a power supply through a wire, so that the sensor is difficult to replace and maintain. Compared with the prior art, the wireless power supply device is used for supplyingpower so that the functional module can be independently disassembled, and the replacement or maintenance of the sensor is greatly facilitated.

The invention relates to a pipeline coagulation method for quickly reducing outfall pollution. The method comprises the following steps: adding a coagulant and a flocculant into a tail-end drainage pipeline, and directly carrying out coagulation and flocculation in the tail-end drainage pipeline. Compared with the prior art, the tail-end drainage pipeline is used for carrying out mixing and coagulation flocculation reaction on sewage, so that the subsequent treatment time can be greatly shortened, the treatment efficiency is improved in a disguised manner, rapid discharge of redundant rainwater and sewage mixed water can be realized in rainy days, and urban drainage is not influenced; the space of a tail-end drainage pipeline is utilized, a subsequent mixing tank and a subsequent reactiontank are omitted, the occupied area is reduced by 32.6%-75%, and an effective reference method is provided for an urban drainage system with land shortage; and the response time of the reaction tank is saved while a coagulation and flocculation reaction tank is omitted, so that the total response time is shortened, and the stability of the effluent quality is accelerated.

The invention discloses a flow control method for a diversion shaft. A predetermined flow value is set, a flow value of a second water outlet pipe is measured as a real-time measured value, and the real-time measured value is compared with the predetermined flow value. When the real-time measured value is greater than the predetermined flow value, a controller issues a control signal to drive a control valve to actuate a pneumatic shut-off device to inflate, the second water outlet pipe tends to be closed until the measured value is equal to the predetermined flow value, and then the pneumaticshut-off device stops inflation. When the real-time measured value is smaller than the predetermined flow value, the controller issues a control signal to drive the control valve to actuate the pneumatic shut-off device to deflate, the second water outlet pipe tends to be opened until the measured value is equal to the predetermined flow value, and then the pneumatic shut-off device stops deflation.

The invention discloses a water-saving drainage system for a roof. The water-saving drainage system comprises a main drainage pipeline, an intercepting plug, pumping equipment, a pumping pipeline and a branch drainage pipeline, the top of the main drainage pipeline is connected with a roof drainage outlet, the main drainage pipeline is used for draining roof rainwater to the ground, the intercepting plug is located in the main drainage pipeline and used for intercepting the rainwater drained by the main drainage pipeline, the pumping equipment and the pumping pipeline are used for pumping the rainwater intercepted by the intercepting plug to the roof, two ends of the branch drainage pipeline are butted with the main drainage pipeline, and the branch drainage pipeline is used for draining excessive accumulated water in a bypass after the intercepted rainwater in the main drainage pipeline exceeds a certain water storage height. The purpose of realizing water-saving drainage of the roof is realized.

The invention provides a pipe rack and a pipe rack assembly containing same. The pipe rack comprises a pipe body, and further comprises a valve mechanism and a plurality of water level sensors; the pipe body comprises a center pipe and a first outer pipe; the outer side wall of the center pipe is connected with the inner wall of the first outer pipe through a plurality of first connection ribs; astandby channel is defined by the center pipe and the first outer pipe; a plurality of flow disturbing blocks are arranged on the inner wall of the bottom of the center pipe; a plurality of flow discharging holes are formed in the pipe wall of the center pipe; the valve mechanism comprises a plurality of valves and driving assemblies; the driving assemblies are fixedly arranged on the outer wall of the center pipe; each valve is connected with the corresponding driving assembly; each valve is arranged on the corresponding flow discharging hole in a covering manner; all the water level sensorsare uniformly distributed on the inner wall of the top of the center pipe, and are electrically connected with the driving assemblies; and when the water level sensors detect that the water level in apipe reaches a preset water level, each driving assembly is used for opening the corresponding valve. The pipe rack and the pipe rack assembly solve the problem that after an underground pipe rack isblocked by city waste, water draining is affected.

The invention discloses a ventricular drainage positioning stent which comprises an L-shaped positioning mechanism, a guide post and a fixing mechanism, wherein the fixing mechanism is used for fixingthe guide post on the bed edge of a hospital bed; the L-shaped positioning mechanism comprises a positioning rod A and a positioning rod B; a guide hole is vertically formed in the position, which isclose to the first end of the positioning rod A, of the bottom wall of the positioning rod A; the guide post penetrates through the guide hole, and the lower end of the guide post is connected with the fixing mechanism; a locking bolt A is arranged at the position, which is close to the first end of the positioning rod A, of the side wall of the positioning rod A; scale marks from 0cm to 15cm bytaking centimeter as the unit are arranged on the outer wall of the positioning rod B from bottom to top; the 0cm scale mark arranged on the outer wall of the positioning rod B is flush with the top wall of the positioning rod A; and when the locking bolt A is loosened, the height of the positioning rod A is adjustable, so that the height of the L-shaped positioning mechanism is adjustable. The ventricular drainage positioning stent has the effects that the positioning accuracy at the lowest point of the external auditory canal of a patient and positioning accuracy of the highest drainage position of a drainage tube can be ensured, and related nursing operation of ventricular drainage of the patient can be conveniently and rapidly performed, so that the ventricular drainage positioning stent disclosed by the invention is high in practicality and excellent in using effect.

The invention discloses a grouting consolidation method for a large-diameter concrete pipeline lining fiber grid. The grouting consolidation method comprises the following steps: clearing the inner surface of a to-be-consolidated concrete pipeline; mounting a fiber grid on the inner surface of the processed pipeline, and temporarily fixing the fiber grid by the device; mounting a waterproof surface layer at the outer side of the mounted fiber grid, and using the device to temporarily fix the waterproof surface layer; grouting mortar into a gap between the paved fiber grid and the waterproof surface layer; and after mortar curing is accomplished, dismounting a waterproof surface layer fixing device, and welding a jointing seam exposed by the surface layer. The effect of the fiber grid, themortar and the waterproof surface layer is sufficiently brought into play. The method disclosed by the invention can be adopted to remarkably improve structure bearing ability, also can form an effective waterproof layer on the surface of the structure, does not need excavation, is quick in construction, and is small in influences on production and life.

The invention discloses a back stop device of a drain pipe of an irrigation seepage control canal, which comprises a base, wherein a groove, an installing groove and a first water gap are arranged on the base; a shaft is arranged in the middle of the base of the first water gap; a positioning lug is arranged on the base; a sealing disc is installed in the groove; a round hole and an arc groove are arranged on the sealing disc; the periphery of the sealing disc is provided with a spacing convex edge; a second water gap is arranged on the sealing disc; the round hole is matched with the shaft; the positioning lug is matched with the arc groove; the spacing convex edge is matched with the edge of the base; a triangle hole is arranged on the sealing disc and communicated with the round hole; a water permeable cover is mounted on the periphery of the base; a water outlet hole is arranged on the water permeable cover; an adjusting rod is installed in the middle of the water permeable cover; a triangle block is arranged at one end of the adjusting rod and matched with the triangle hole; and a flexible pipe is installed on the periphery of the water permeable cover. The invention can solve the problems in the prior art, can prevent water in the canal from reversely flowing and recharging through the drain pipe in an irrigation period, can greatly improve the seepage control effect of the seepage control canal, and simultaneously can not affect the draining function of the drain pipe.

The invention relates to the field of water body ecological treatment, and discloses an exogenous sewage ecological treatment system which comprises a biological treatment area arranged in a water body near a sewage draining exit, a physical treatment area surrounding the biological treatment area and the sewage draining exit to form a closed area, and an aeration device used for aerating the bottom of the biological treatment area, wherein the biological treatment area comprises an ecological floating island arranged on the water surface and used for planting aquatic plants and a microorganism growth ecological base connected to the lower portion of the ecological floating island, and the physical treatment area comprises a supporting layer located at the bottom of a water body, an adsorption filler layer arranged on the supporting layer and a plant layer arranged on the adsorption filler layer. According to the invention, biological treatment and physical treatment are combined, so that the removal efficiency of water pollutants is improved, the layout is reasonable, and the space utilization rate is high; modular installation is achieved, installation is efficient and rapid, maintenance is easy and convenient, and the impact resistance of the system is high; solar energy is used for supplying power, extra power is not needed, and operation cost is low.

The invention provides a floor type air conditioner indoor unit and an air conditioner. The indoor unit comprises a shell, a heat exchanger, a draught fan and a chassis; a plurality of air inlet holes are formed in the shell, an air inlet is defined by the multiple air inlet holes, and an air outlet communicated with the air inlet is formed in the shell; the heat exchanger is located in the shell and corresponds to the air inlet; the draught fan is located in the shell, under driving of the draught fan, air enters the shell from the air inlet and exchanges heat with the heat exchanger, and the air subject to heat exchange is blow out through the air outlet; the chassis is mounted below the shell, the multiple air inlet holes are arranged in a manner of being close to the shell, and the distance between the lower edge of the air inlet hole in the bottommost portion and the lower surface of the chassis is within the preset range; according to the floor type air conditioner indoor unit, the arrangement height of the air inlet hole in the bottommost portion does not obstruct mounting of a heat exchanger outlet pipe and mounting and work of a water receiving disc, air at the lower position can enter the air inlet and participates in air circulating and convection, and indoor temperature uniformity is improved.

The invention provides an automatically sealing floor drain, which belongs to technical field of building. The invention solves the problems of poor deodorizing effect and easy blockage of the existing deodorizing floor drain. The automatically sealing floor drain comprises a cylindrical body having a water inlet and a water outlet. A cover plate is arranged above the body. A magnetic sealing member is arranged at the water outlet. A blocking member capable of preventing the magnetic sealing member from falling off is further arranged below the body. The inside of the body is provided with a circular permanent magnet parallel to the cover plate. The magnetic sealing member is capable of sealing the water outlet under the magnetic attraction of the magnetic sealing member and the circular permanent magnet. The automatically sealing floor drain has the advantages of good sealing effect, long service life, effective prevention of insects and peculiar smell, and the like.

The invention provides a urinary catheter including a bladder end closed top, a water bag, a urine drainage pipe, a flushing pipe, a water bag water injection pipe, a urinary catheter tail end and anannular flushing structure, wherein a micropore, a connector and a funnel-shaped connection port are disposed on the side wall of the annular flushing structure. Pipes on the urinary catheter are notcommunicated with each other and are provided with outlets and inlets respectively. The annular flushing structure divides the urinary catheter into catheter bodies with two diameters, so that a gap is formed between the urinary catheter and the urethra, drainage can be performed effectively, and urethra postoperation secretions can be flushed. The side wall of the annular flushing structure is provided with the micropore, wherein the included angle between the micropore and the axis parallel to the urinary catheter is smaller than 90 degrees, and the further damage of the urethra suture can be reduced. The connector and the funnel-shaped connection port are of a detachable structure. When flushing is not required, the connector and the funnel-shaped connection port can be dismantled, to alleviate the burden on a patient; connection ports of each pipe are in dislocation layout, and misoperation is reduced.

The invention provides an environment-friendly drain board which comprises a board body and a filtering layer arranged on the board body in a covering mode. A plurality of hollow protrusions are arranged on the board body. The board body is made of melamino-formaldehyde resin, and the distributing rate of the hollow protrusions on the board body is larger than 80%. The filtering layer is made of geotechnical cloth, and the hole diameter of the geotechnical cloth ranges from 20 micrometers to 180 micrometers. The filtering layer and the board body can be combined in a bonding or heat sealing mode. The environment-friendly drain board has the advantages of being good in drain effect, low in machining cost, degradable, environmentally friendly and free of pollution, and saving energy.

The invention provides a cleaning device for gentle slope water power floating garbage of a shallow water beach of a riverway. The cleaning device includes a riverbed substrate plate and a lifting supporting base plate. The surface of the riverbed substrate plate is provided with a hydraulic cylinder, the inner wall of the hydraulic cylinder is slidably connected with a hydraulic plug, a hydraulicrod is welded to the surface of the hydraulic plug, a lifting supporting plate is welded to the surface of the hydraulic rod, the surface of the lifting supporting plate is welded to the lower surface of the lifting supporting base plate, and the surface of the hydraulic cylinder is sleeved with an oil inlet pipe, which relates to the field of environmental protection. According to the cleaning device for gentle slope water power floating garbage of the shallow water beach of the riverway, by arranging a first vortex forming plate and a second vortex forming plate to form a curve, on the onehand, water flows on the two sides is concentrated to the surface of the first vortex forming plate and the surface of the second vortex forming plate, so that vortex is formed more easily by means ofthe force of the water flow, thereby effectively solving the problems that an ordinary cleaning device cannot well adapt to shallow water beach flotage cleaning and the garbage is retained easily atthe shallow water beach.

The invention relates to a pipe network runoff purification device based on a rotational flow sand setting principle, and belongs to the technical field of sewage treatment. The device comprises a tank body, a water inlet pipe, a water outlet pipe, a flow guide plate, a supporting body, an energy dissipation grating and a sand collecting hopper, the water inlet pipe is connected into the cylindrical tank body at a low position in the tangential direction of the tank body, the water outlet pipe is connected out of the tank body at a high position in the tangential direction of the tank body, and the outer edges of the water inlet pipe and the water outlet pipe are tangent; axes of the water inlet pipe and the water outlet pipe are on the same vertical plane; a half-moon-shaped guide plate is arranged between the upper edge of the opening of the water inlet pipe and the lower edge of the opening of the water outlet pipe in the horizontal direction; wherein a support body is arranged at the bottom of the tank body, an energy dissipation grid is supported on the support body, and a sand collecting hopper is formed in a tank body space below the energy dissipation grid; and the energy dissipation grid is a split type grid, and a plurality of fan-shaped grids form a complete circular grid. The invention effectively overcomes the defects of an existing rotational flow sand setting device for the drainage pipeline.

The invention relates to the technical field of household appliances, in particular to a residual water removing device and a dish washing machine. The residual water removing device comprises a bodyand a negative pressure structure, and a cavity is formed in the body; at least part of the negative pressure structure is arranged in the cavity; the negative pressure structure is arranged in the cavity and divides the cavity into a water absorption cavity, a circulation opening is formed in the water absorption cavity, and the water absorption cavity has the water absorption state that the volume is increased to form negative pressure and water is absorbed through the circulation opening and the water drainage state that the volume is reduced and water is drained through the circulation opening under the action of the negative pressure structure. The residual water removing device is not blocked, and the residual water removing effect is good.

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.