331 results about "Drainage flow" patented technology

An integral conduit (407) in the formed of stepped tubing defines at least part of a drainage flow path (408 / 408′) that accommodates a flow rate of at least about 0.15 microliters / minute / mm2 / mm-Hg out of the anterior chamber (284) of the eye (266). One or more flow modules (415) may be disposed within this drainage flow path (408 / 048′) and are located exteriorly of the eye (266). Each flow module (415) may be in the form of a filter or a pressure regulator. In one embodiment, one flow module (415) in the form of a filter is used in combination with another flow module (415) in the form of a pressure regulator.

The present invention provides thoracentesis systems composed of an insertion needle, a thoracentesis catheter with self-sealing valve, and a valve opening device which are utilized in the removal of fluid or gases from a pleural cavity. The insertion needle is utilized to insert the thoracentesis catheter into the pleural cavity. The thoracentesis catheter provides automatic closure of the flow path from the pleural cavity by automatic closure of the self-sealing valve upon removal of the insertion needle from the thoracentesis catheter. The self-sealing valve prevents drainage of fluid from the pleural cavity and introduction of air into the pleural cavity when the needle is withdrawn from the thoracentesis catheter and a valve opening device is not in place. A drainage flow path from the pleural cavity is established by insertion of a valve opening device into the self-sealing valve of the thoracentesis catheter, thus opening the self-sealing valve. With the self-sealing valve opened by a valve opening device, fluid or gases can be removed from the pleural cavity.

The invention discloses a wall-hanging type air conditioner, which comprises an indoor machine with a shell body, wherein a heat exchanger and a main air duct are formed inside the shell body; the shell body is provided with a main air inlet and a main air outlet; a main injection flow fan is formed inside the main air duct; a fisrt drainage air outlet is formed below the main air outlet on the shell body; a first drainage air duct separate from the main air duct is formed inside the shell body below the main air duct; the first drainage air duct is communicated with the first drainage air outlet; a first drainage flow fan is formed inside the first drainage air duct; the shell body is also provided with a second drainage air outlet; the second drainage air outlet is located on the outer side of the main air outlet next to an upper edge of the main air outlet; a second drainage air duct separate from the main air duct is also formed inside the shell body; the second drainage air duct is communicated with the second drainage air outlet; and a second drainage flow fan is formed inside the second drainage air duct. By adopting the wall-hanging type air conditioner provided herein, mixing ventilation can be realized on the basis that the main air duct is not changed.

The invention relates to a horizontal initial rainwater drainage device, a water inlet tank is arranged on the right side of the upper part in a box body, a rainwater inlet is arranged at an inlet at the front end of the water inlet tank, and a rainwater collection port is arranged at the back end of the water inlet tank; a shunt plate is arranged in the back part position of the water inlet tank for dividing the back end of the water inlet tank into two parts with different sizes; a drainage shunt collection hole is arranged at the bottom part on the left side of the shunt plate and communicated with a drainage collection chamber below the back end part of the water inlet tank; a drainage shunt outlet opening is arranged below the end part on the right side of the shunt plate, a floating sliding groove is arranged under the drainage shunt outlet opening, the bottom of the groove is hollow, and the groove is communicated with the drainage collection chamber; a floating block is arranged in the floating sliding groove, a drainage flow by port is arranged on the front wall above the floating block, a drainage flow by groove in the vertical direction is arranged on the other side of the hole, and the hole is positioned on the upper side of the drainage flow by groove; and a drainage outlet opening is arranged at the bottom part of the drainage flow by groove and communicated with the outside of a machine body. Due to the adoption of the structure, the device can retain and collect later rainwater with better water quality, simultaneously effectively drain initial rainwater, reduce the cost, be applicable to different types of rainfall and be conductive to popularization.

The invention provides an entitative coal seam gas drainage drilling hole double-pipe drainage method, which is particularly applicable to a coal mine underground entitative coal seam long-distance and large-aperture gas drainage drilling hole. A gas drainage pipe is sent into the drainage drilling hole to the hole bottom, a flexible sleeve pipe with the diameter being twice the diameter of the gas drainage pipe is sheathed at the back part of the gas drainage pipe, a 3-4m pattern hole is formed at the front end of the flexible sleeve pipe, a first polyurethane double-material hole sealing bag and a second polyurethane double-material hole sealing bag are respectively and fixedly arranged in positions with distances being 4 to 5m and 22 to 23m from the front end of the flexible sleeve pipe by adhesive tapes, and the flexible sleeve pipe is sent into the drainage drilling hole after the hole sealing bags are extruded so that the second polyurethane double-material hole sealing bag is 2 to 3m away from the hole opening of the drilling hole; after the polyurethane is cured, cement mortar is filled between the two polyurethane hole sealing sections; and after the cement mortar is cured, the flexible sleeve pipe is connected into a gas drainage net for gas drainage. The method has the advantages that the structure is simple, the operation is convenient, and the problem of gas drainage flow rate reduction can be effectively solved.

The invention discloses a breakwater capable of generating electricity by using waves. The upstream side of the cylindrical breakwater is provided with a water accumulating structure; the water accumulating structure comprises two side walls fixedly connected with the cylindrical breakwater; the bottoms of the two side walls are fixedly connected with a reinforced concrete cover plate; the two side walls are provided with inclined upstream fixed front baffle plates; the bottoms of the fixed front baffle plates are fixedly connected with the reinforced concrete cover plate; the reinforced concrete cover plate, the two side walls, the cylindrical breakwater and the fixed front baffle plates form a water accumulating pond with a water accumulating structure; a support frame of the water accumulating structure is arranged in the water accumulating pond; the bottom of the cylindrical breakwater is provided with a drainage flow channel communicated with the water accumulating pond; the drainage flow channel is communicated with the cylindrical breakwater; and a hydraulic power generation unit is arranged in the drainage flow channel. The breakwater capable of generating electricity by using waves has a wave-preventing function, is provided with a wave power generation device, has structural stability and high energy conversion efficiency, and realizes structural optimization.

The invention discloses a preparation device of a supersaturated hydrogen solution and a preparation method thereof. The preparation device of the supersaturated gas solution comprises a gas generator, a gas-liquid mixer and a water tank. The gas generator generates an air source. The gas-liquid mixer is connected to the gas generator. The gas-liquid mixer and the water tank are connected by a gas-liquid mixer water absorption flow branch and a gas-liquid mixer drainage flow branch respectively. And the gas-liquid mixer water absorption flow branch and the gas-liquid mixer drainage flow branch form a gas-liquid mixed flow loop. According to the invention, gas in the form of micro-nano scale diameter bubbles is fully mixed with water, a gas-liquid mixture cyclically operates through the gas-liquid mixed flow loop to form a supersaturated gas solution in the water tank rapidly within a predetermined time, and the gas mass concentration of the supersaturated gas solution is significantly higher than the mass concentration of gas prepared by a conventional method, both the prepared gas mass concentration and the preparation time are superior to the prior art, and the preparation efficiency is high.

A ballast water treatment device is provided with: a filter which is cylindrically disposed so as to surround an axis; a case which has an outer cylindrical part provided so as to surround the filter; a rotation mechanism which rotates the filter about the axis; a water-to-be-treated nozzle which discharges water to be treated to a filter outside region formed by the outer peripheral surface of the filter and the outer cylindrical part; a washing water nozzle which discharges washing water toward the outer peripheral surface of the filter; a filtrate water flow path through which filtrate water transmitted through the filter is led from the inside region of the filter to the outside of the case; and a drainage flow path through which drainage water not transmitted through the filter is drained from the filter outside region to the outside of the case.

A geonet having a length substantially greater than its width and including no more than first and second layers of strands. A first plurality of substantially parallel strands extends in the lengthwise direction and defines the first layer of strands, and a second plurality of substantially parallel strands is disposed on top of, and at an angle relative to, the first plurality of strands and defines the second layer of strands. The first and second plurality of strands are substantially incompressible and secured to one another at crossover locations. Geocomposites include geotextile bonded to at least one side of the geonet. The geonets / geocomposites are laid in geotechnical construction sites in the direction of expected drainage flow.

The invention discloses a preparation device and a preparation method for an over-saturated hydrogen solution. The preparation device comprises a hydrogen generator, a gas-liquid mixer and a water tank, wherein the hydrogen generator is used for generating a hydrogen source; the gas-liquid mixer is connected with the hydrogen generator; a gas-liquid mixer water absorption flowing branch path and a gas-liquid mixer water drainage flowing branch path are respectively connected between the gas-liquid mixer and the water tank; a gas-liquid mixing flowing loop is formed by the gas-liquid mixer water absorption flowing branch path and a gas-liquid mixer water drainage flowing branch path. By adoption of a method for fully mixing gas with water in a micronano-level diameter gas bubbles; gas-liquid mixed fluid cyclically runs in the gas-liquid mixing flowing loop to quickly form the over-saturated hydrogen solution within two minutes in the water tank, and the mass concentration of hydrogen of the hydrogen solution is not smaller than 2.5ppm; either the prepared hydrogen concentration or the preparation time is higher than that in the prior art, and the preparation efficiency is high.

The invention relates to a tunnel siphon water drainage system and a construction method thereof. The water drainage system comprises a drilling hole which is formed in a water seepage point in the wall of a tunnel, a water reservoir arranged on the bottom of the drilling hole, a siphon sleeve communicated with the water reservoir, a water storage barrel and a longitudinal water drainage ditch, wherein an included angle between the drilling hole and a vertical direction is 45-75 degrees; one end of the siphon sleeve is inserted into the drilling hole and is communicated with the water reservoir, and the other end of the siphon sleeve is vertically guided out from the drilling hole, and is arranged in the water storage barrel; a water outlet of the siphon sleeve is lower than the water reservoir by 40-60 cm; during construction, drilling is firstly carried out, the water reservoir and the water storage barrel are arranged, and the two ends of the siphon sleeve are separately inserted into the water reservoir and the water storage barrel. Compared with the prior art, the tunnel siphon water drainage system has the advantages that underground water near the water seepage point in the tunnel wall can be discharged timely, power is not needed to be additionally provided in a water drainage process, water drainage flow and a flow process are automatically controlled by water level changes, and smooth water drainage is effectively guaranteed.

The invention provides a cross drilling constrained expansion network anti-reflection gas drainage method, and belongs to the technical field of coal rock gas drainage. The method is characterized by comprising arranging cross drill holes on a thick coal seam whose permeability is low, an upper row of the cross drill holes being gas drainage cross drill holes, a lower row of the cross drill holes being arranged with the gas drainage cross drill holes and blastholes at interval, fixing blasting cartridges in a constraint manner on intersection positions of the lower row blastholes and the upper row gas drainage cross drill holes, to apply anti-reflection blasting to generate network cracks. A water bag is used to separate two blasting cartridges, and the water bag suppresses expansion and reduces dusts and can cuts apart a coal and rock mass, to form an effective drainage crack. Using the method can achieve objectives of increasing permeability of a coal seam, increasing gas flow of a cross drill hole drainage hole and prolonging effective duration time of gas drainage flow, and the method would not excessively damage a coal mass.

The invention relates to a method and device suitable for repairing a downhole failed gas extraction drilled hole. According to the method and the device, a guiding pipe outside the drilled hole is connected to a drainage pipeline through a flange and a quick connector, when the drainage flow or concentration of gas is greatly lowered, the flange is dismounted, a water pressure self-driven drilled hole repairing system device is connected, post-positioned reverse spray nozzles of a water pressure self-driven drill bit form reverse a jet flow so as to supply advancing power to the drill bit in the drilled hole, prepositioned forward outer-ring spray nozzles form an annular jet flow so as to supply rotating, reaming and deslagging power to the drill bit, and forward inner-ring spray nozzles form an annular jet flow and a center spray nozzle forms a forward jet flow, so as to supply power to slag removal and slag discharge; the exterior of the water pressure self-driven drill bit is of a shuttle-shaped structure, so that driving resistance can be reduced, and the withdrawing and reuse of the drill bit are facilitated. A simple and efficient method for repairing the failed drilled hole is provided, and the aims of prolonging the service time of the drilled hole and increasing the use efficiency of the drilled hole are achieved.

The invention provides a simulated rainfall earth pillar infiltration test system which is used for researching infiltration laws of rainfall in unsaturated soil. The simulated rainfall earth pillar infiltration test system is characterized in that the test system comprises a simulated rainfall device, a rainwater receiving device, a data acquisition device, a control system and a data analysis device, the simulated rainfall device comprises a water storage tank, a water flow circuit unit and a spray component, the water flow circuit unit is connected with the water storage tank, the spray component for simulating rainfall is connected with the water flow circuit unit, the rainwater receiving device comprises a plurality of soil column cylinder units and runoff drainage units, the soil column cylinder units are arranged on the lower portion of the spray component, the runoff drainage units are arranged on the outer sides of the soil column cylinder units, the data acquisition device comprises a water supply flow meter, drainage flow meters and a plurality of sensor units, the water supply flow meter is arranged on the water flow circuit unit, the drainage flow meters are arranged on the runoff drainage units, the sensor units are arranged on the soil column cylinder units and used for acquiring rainfall earth pillar infiltration data, the control system is used for controlling water supply quantity of the water flow circuit unit and drainage of the runoff drainage units, and the data analysis device is used for receiving data acquired by the data acquisition device and analyzing the data to obtain the infiltration laws of rainfall in the unsaturated soil.

The invention relates to a device for preparing a thin film by a liquid level drawdown method, which controls the stable liquid level drawdown of sol by utilizing the principle of hydraulics and realizes uniform film coating on a substrate. The device mainly comprises a hydraulic piston, a hydraulic piston sleeve, a substrate bracket and the like. The uniform film coating of the sol on the surface of the substrate is implemented by the following steps: hanging the substrate with a clean surface on a sample bracket at a top end, fixing a container accommodating the sol at the top end of the hydraulic piston, closing a liquid outlet of a hydraulic pipeline at the lower end of the device, injecting liquid (water or oil) into the piston sleeve through a liquid inlet by using a hydraulic pump, driving the container accommodating the sol to move upwards by using the piston, and gradually impregnating the hung sample substrate in the sol so as to finish a substrate impregnation process; and stopping injecting the liquid, opening the liquid outlet and making the piston move downwards. The device controls the injection flow rate and drainage flow rate of the liquid by utilizing a flow-limiting valve so as to accurately control the film coating speed and can be charged with a drying gas to control the atmosphere of the film coating environment by a gas passage arranged on the device. Due to the design of small holes on a baffle plate in the device, the airflow disturbance is reduced, thereby ensuring more stable film coating process.

Disclosed are a drainage system air pressure fluctuation test method and a device thereof; the device is composed of a water tank, a water supply and drainage pipe system and a test instrument; the water tank is arranged at a position which is more than 5 meters high; the water supply and drainage pipe system is composed of a water tank outlet pipe, a valve, a horizontal drainage pipe, a tee joint, a reducing elbow, a 45-degree elbow, a ventilation pipe, a horizontal branch pipe, a vertical drainage pipe, a horizontal discharging pipe and a triangle plastic plate; and the test instrument comprises a pressure sensor and a computer. The test method comprises the following steps: supplying the water tank with water, recording the water level calibration number of a glass tube outside the water tank, starting up the computer, opening the valve at an angle of 60 degrees and discharging water for 20 seconds; the closing the valve, recording the water level decrease value of the water tank, and calculating the average flow during the water discharging period based on data; repeating the test for three times for each flow, removing the data with irregular pressure fluctuation from the beginning of water discharging to the five seconds before the end of the discharging; and then taking the average value so as to get the pressure extreme value in the operating condition. The test method and the device are easy to use and operate, and provide a technical platform for improving the drainage flow pattern, reducing the air pressure fluctuation inside the standpipes as well as improving the water passing capacity of the water drainage system.

The invention relates to a device for measuring a flow and a flow velocity of a drainage pipeline synchronously. A water inlet is formed at the upper end of an impact-relief measuring water tank and a small hole is formed at the lower end of the impact-relief measuring water tank; a stabilized voltage supply is used for providing voltage for a differential pressure transducer; the differential pressure transducer is connected with the small hole at the lower end of the impact-relief measuring water tank through a hose and is used for generating a corresponding current according to the change of pressure intensity; an analog / digital (A / D) data acquisition card is used for acquiring the voltage of the two ends of a resistor which is connected with the differential pressure transducer, converting voltage signals into digital signals and sending the digital signals to a computer; a vidicon is used for taking a picture of a reference object moving with water flow in the drainage pipeline and transmitting the taken picture to the computer in real time; and the computer is used for receiving the real-time picture which is transmitted by the vidicon and computing the flow velocity of water in the drainage pipeline through an image acquisition frequency and a displacement distance of the image in each frame, and receiving the digital signals sent by the A / D data acquisition card and computing the flow of water in the drainage pipeline. The invention is applicable for measuring the drainage flow and the drainage flow velocity of the sanitary ware and the horizontal drainage pipeline in a building.

The invention discloses a double-hole drainage pipe which is applied to an indoor drainage pipeline of a building and can be used for completing drainage and ventilation by a riser. The double-hole drainage pipe mainly comprises a straight pipe, a connector and a pipe fitting, wherein the straight pipe consists of an inner pipe 1 and an outer pipe 2, the inner pipe 1 is supported and fixed in the outer pipe 2 by a side wing 4 and a positioning tenon 5, concentric circles are formed by the inner pipe 1 and the outer pipe 2, a drainage hole is formed in the inner pipe, a vent hole 6 is formed in an annular channel between the inner pipe 1 and the outer pipe 2, the drainage riser is formed by one pipe, achieves a drainage effect of double risers but occupies less space compared with the double risers and is convenient to clean and maintain, and vents for connecting drainage with ventilation are uniformly distributed in the riser, so that the venting effect is good, the possibility of air blocking is low, and the drainage flow is large. The riser passes through a floor slab, and is convenient to connect and install compared with the double risers, so that the construction process is reduced, and the construction efficiency is improved.

The invention provides a real-time dynamic monitoring system of a remote irrigation and drainage system based on internet. The system comprises a data collection unit which comprises a meteorologicalfactors module, a canal system water level-flow module, a field soil moisture content module, an underground water level module and a drainage flow module arranged in the field, wherein the data collection unit is used for acquiring parameters required by the irrigation and drainage system; a storage system comprises a remote receiving terminal, a cloud storage module and a data visual analysis module; a model system automatically acquires the required parameters through a cloud platform in a cloud storage module, and performs data processing, wherein the model system comprises a parameter calibration and inversion module, a crop water need prediction model, an irrigation system optimization model, an irrigation area water balance computation module and a water usage management module. Theremote, intelligence and high efficiency of the irrigation area and basin water resource monitoring technology are realized by utilizing the modern information technology, the technical support is provided for the hydraulic engineering modern construction and water resource intelligent management, and the modern management level and the water resource utilization efficiency of the irrigation areacan be improved.

The invention discloses a method for dynamically predicting drainage discharges at drainage outlets of urban rainwater system. The method comprises the following steps of: (1) simulating a rainfall-runoff by utilizing a rainstorm flood management model pair, and taking drainage flow duration curves at outlets of a plurality of drainage pipe networks as training samples; (2) establishing an RBF neural network to carry out training, and in the training process, optimizing network hidden nodes and center widths Spread; (3) establishing an NARX neural network to carry out training; and (4) coupling the trained NARX neural network and the RBF neural network to obtain a coupled network, carrying out prediction, calculating mean square errors between the coupled network and the samples, returninga flow value with the minimum mean square error as an optimized coupling locus, randomly selecting rainfall data to input into the coupled network so as to obtain a predicted drainage flow duration curve. According to the method, advantages and characteristics of different neural networks are organically combined, the prediction results well accord with SWMM simulation, and the mean square errorsof the curves are 0.000458, so that favorable prediction precision is provided.

The invention provides a coalescence filter core structure and a filtering device. The coalescence filter core structure comprises: a first inner frame, which is equipped with at least one internal drainage flow channel and an air inlet at the bottom, and encircles a to-be-filtered space communicated with the air inlet; a pre-filter layer and a liquid collection layer that are sleeved outside thefirst inner frame in order; a second inner frame sleeved outside the liquid collection layer, with a clearance space being formed between the liquid collection layer and the second inner frame and being communicated with the internal drainage flow channel; an outer frame sleeved outside the second inner frame, with a coalescence space formed between the second inner frame and the outer frame; a filter core disposed in the coalescence space; an upper end cover, which seals at least the end of the to-be-filtered space; and a lower end cover, which is equipped with an opening for inserting into the first inner frame, and is in detachable connection with the bottom of the first inner frame. The coalescence filter core structure and the filtering device provided by the invention can prolong theservice life of the coalescence filter core.

The invention discloses a fish farming device with a salinity auto-control and auto-adjust function of a water body. The main structure comprises a fish tank, a salty water tank, a fresh water tank, an air pump and a central control unit; the central control unit is provided with a fish tank salinity detection probe which reaches to the bottom of the fish tank and is used to detect the salinity of the water body in the fish tank. A strong brine salinity detection probe reaches to the bottom of the salty water tank and is used to detect the salinity of the water body in the salty water tank. The inflow, outflow and quantity of drainage flow of salty water and fresh water in the whole device are regulated and controlled by a flow control implementation structure controlled by the central control unit. The outflow and inflow of the fish tank is controlled by a drainage electromagnetic valve control signal line connected to the outer edge of the bottom of a PVC pipe in the center of the fish tank. By use of the fish farming device, auto-monitor and auto-adjust of the salinity of a water body, and changing water at a same salinity level are achieved. The change of salinity of water body can be preset according to requirements so that the salinity of water body can be changed according to cultivation requirements.

The invention provides a fixed temperature water supplying device. Damage of a driving part is avoided and time for exchange work of cooling water and shutdown time are greatly reduced. The fixed temperature water supplying device (1) comprises a first storage container (11) for storing water used for processing, a first flow path (12) for providing water of the first storage container for a processing device (3), a water temperature adjusting unit (16) for adjusting water temperature in the first flow path, a second storage container (21) for storing water used for cooling a driving part, a second flow path (22) for providing water of the second storage container for the driving part (4), a circulation flow path (23) for returning water for cooling the driving part from the driving part to the second storage container, a fixed temperature water supplying flow path (31) for providing water with adjusted temperature for the second storage container from the first flow path, and a water drainage flow path (32) for draining water in the second storage container to the outside. By providing water for the second storage container from the first flow path and draining water from the second storage container, water in the second storage container is exchanged.

The damping device of the tensioning device has at least one damping channel that is open in both flow directions as a component of the fluid supply in such a way that during operation at least a portion of the supply stream is fed through the at least one damping channel into the pressure reservoir, and the damping device and the venting device are coupled with each other by fluid engineering means such that a drainage flow from the pressure reservoir occurs via the damping device and the venting device in combination, and the supply flow occurs predominantly independently of the venting device.

An air trap (74) is formed integrally with a water tank (42) in the side wall at the bottom rear of the outer circumference of the water tank (42) and has an opening (88) at the bottom. A water level detection tube (87) communicating with the air trap (74) via the opening (88) is formed integrally at one end of a drainage pipe (64) which is connected to a drainage port (85) formed at the bottom of the water tank (42). The drainage pipe (64) is connected to a case connection port (89) of a filter case (83), and by arranging the air trap (74), the water level detection tube (87), the drainage port (85), the drainage pipe (64), and the case connection port (89) essentially horizontally, the drainage flow is rectified, foreign objects such as pieces of thread contained in the wash water are less prone to flow into the air trap (74), and the water level in the water tank (42) is stabilized.

The CSF shunt valve includes an elongate, hollow housing and a valve unit disposed within the housing. A plurality of exit ports are formed along the wall of the housing, and a plurality of bleeder ports are formed on the bottom of the housing. The valve unit includes at least one regulating mechanism disposed within the housing. Each regulating mechanism includes an obstructing member operatively attached to a spring. The spring is compressible within a predefined range of fluid pressure. The obstructing member compresses the attached spring in response to fluid pressure acting thereon, opening the exit ports for fluid being drained. The spring-biased obstructing members facilitate self-adjustment for drainage flow. Although arranged in series, the range limits are not continuous with subsequent springs, which safeguards against transient spikes in fluid pressure and ensures independent compression of subsequent springs in response to the predefined limits of pressure for that spring.

The invention discloses a building drainage plastic stack with spiral ribs. The plastic stack comprises a plastic stack body, wherein the inner wall of the plastic stack body is coaxially and circumferentially provided with a plurality of spiral ribs along the axis of the stack; the top surfaces of the spiral ribs are curved surfaces; junctions of the root parts of the spiral ribs and the inner wall of the plastic stack body are of circular arc transition structures. The top surfaces of the spiral ribs are curved surfaces, the curvature is greatly reduced (the curvature radius is increased), the situation that a water flow moves towards the center of the stack to produce water blockage is avoided according to the theory of a fluid wall attachment effect, the fluctuation of pressure in the pipe is reduced, the drainage flow rate within a certain pressure fluctuation range is improved, alternate impact of the water flow to the pipe is also avoided, and the pipeline vibration and the drainage noise are greatly reduced.

The invention discloses a constant water level discharge system for a municipal wastewater collecting well. The system comprises the municipal wastewater collecting well, a wastewater channel, a draining pump, a water supply pressure well, a water supply channel, a high-position water outlet well, a high-position water outlet well water outlet, a control module and a draining pump motor, wherein an upper-limit water level sensor and a lower-limit water level sensor are arranged at the top of the municipal wastewater collecting well; the wastewater channel is connected with the municipal wastewater collecting well; a water inlet of the draining pump is connected with the wastewater channel; the water supply pressure well is connected with the draining pump; a water inlet of the water supply channel is connected to the water supply pressure well; the high-position water outlet well is connected with a water outlet of the water supply channel; the high-position water outlet well water outlet is used for conveying sewage to a sewage treatment tank; and the control module receives the wastewater level detected by the upper-limit water level sensor and the lower-limit water level sensor and performs frequency conversion control on the draining pump motor and controls drainage flow of the draining pump. According to the invention, frequency conversion control is performed on the draining pump, so that the water level of the wastewater collecting well of a draining pump station is stabilized in a range of a preset value, and the phenomena that the water level of the wastewater collecting well fluctuates wildly and the draining pump motor is started frequently are prevented.

The invention discloses a big-data-based urban drainage network monitoring and control system comprising a monitoring module, a data sorting module, a comparison unit, a database, an analysis module,a processor, an acquisition module, an alarm unit, a smart device and a display screen. The monitoring module is configured to monitor sewage drainage information in real time, wherein the sewage drainage information includes a liquid level of a sewage pool, drainage time of the sewage pool, and harmful gas information and the harmful gas includes molecular weight information of harmful gas, temperature information of harmful gas, and gas pressure intensity information. According to the invention, with the analysis module, the sewage drainage flow rate is calculated and the drainage speed of the sewage is obtained, so that the staff member can carry out adjustment conveniently, the too fast or too slow drainage is prevented, and the workload of the staff is reduced. Meanwhile, the alarm unit is used for carrying out corresponding prompting on the mass concentration of toxic gas, thereby enhancing the safety of drainage work and improving the work efficiency.