1361results about "Level indicators by pressure measurement" patented technology

The invention discloses a coastal protection dam settlement monitoring method, and belongs to the technical field of hydraulic engineering safety monitoring. The method comprises the steps that a longitudinal monitoring section is arranged on the slope surface of the back sea side of a dam, a three-measuring-line fiber grating sensor array is arranged, and vertical displacement and horizontal dip angle data are periodically collected through a synchronous triggering unit; establishing a vertical displacement-horizontal dip angle joint analysis model by using a multi-source data fusion module, and eliminating tide level interference through a Kalman filtering algorithm to generate a settlement distribution curve; and triggering third-level to first-level early warning signals based on the grading early warning rule, and transmitting the signals to the terminal equipment. The problems that a traditional monitoring method cannot effectively separate tidal interference, the real-time performance is poor, and multi-dimensional data collaborative analysis is insufficient are solved, high-precision settlement monitoring, complex environment anti-interference and rapid emergency response are achieved through multi-measuring-line sensor deployment, dynamic filtering optimization and a graded early warning mechanism, and the method is suitable for large-scale popularization and application. And the reliability and timeliness of dam safety monitoring are obviously improved.

The invention relates to the technical field of industrial automation control, in particular to a container liquid level measurement method, system and equipment of a pressure sensor and a medium, and provides a method for eliminating gas phase pressure influence based on a double-sensor differential measurement mechanism and dynamically correcting liquid density and sensor drift errors in combination with a temperature compensation model. The temperature data are linked in real time through a three-dimensional compensation function, density calculation and drift correction are synchronously adjusted, and multi-parameter dynamic decoupling and self-adaptive compensation are achieved; a collaborative measurement mechanism is adopted to integrate bottom and top sensor data, and a built-in temperature probe and a preset threshold are combined to complete multi-source signal fusion and compensation calculation; a dynamic calibration method is designed, and system errors are eliminated through reference pressure point calibration and structure coefficient correction; constructing a closed-loop signal processing flow, and integrating high-precision analog-to-digital conversion, digital filtering and real-time algorithm to output a compensated liquid level value; the method improves the measurement precision and stability, and is suitable for temperature change, gas phase pressure fluctuation and multi-medium scenes.

The invention discloses a high-precision flow online monitoring device and method for a siltation section, and belongs to the technical field of hydrological monitoring. The device comprises a sensing terminal, an edge terminal and a mounting mechanism, the sensing terminal is integrated with an upper and lower section layered speed measurement module, an underwater distance measurement module, a first absolute pressure type water level measurement module and an attitude and temperature sensor, and vertical section flow velocity data is obtained by receiving water body reflection signals in a time-sharing manner; and the dynamic deposition section area is corrected in real time in combination with ultrasonic ranging. And the edge terminal compensates water level measurement data by using atmospheric pressure, and calculates the flow through fusion of a telemetering module. The installation mechanism supports fixed or telescopic installation, and the height of the installation mechanism is automatically adjusted according to the distance between a deposition layer and equipment. The method comprises the steps of dynamically correcting the section, calculating the flow through layered integration and compensating errors of multiple sensors, the problems of large area deviation, high operation and maintenance cost and the like caused by sedimentation in a traditional flow measurement technology are solved, and high-precision online monitoring under the high-sand-content complex flow state is achieved.

The invention discloses an intelligent water level monitoring system and a data transmission method thereof, and belongs to the technical field of Internet of Things sensing. The system comprises a distributed water level sensing node, an edge computing gateway and a cloud management platform, wherein the sensing node is integrated with a piezoresistive water level transmitter and an adaptive Kalman filtering module; the data transmission method comprises a dynamic threshold triggering mechanism and a compression algorithm based on improved Huffman coding, and low-power-consumption and high-reliability transmission is realized by optimizing transmission frequency and a data packet structure. The edge computing gateway is internally provided with an LSTM water level prediction model, historical data are analyzed through an LSTM neural network, and an early warning signal is generated in real time. And the cloud management platform stores the key data by adopting a block chain technology. Through multi-sensor data fusion and layered encryption transmission, the water level monitoring error rate is reduced to + / -0.5 cm, the data transmission energy consumption is reduced by 40%, and the monitoring efficiency and the data safety are remarkably improved in flood early warning and reservoir management scenes.

A molten salt reactor system includes a fluid level control system configured to circulate a molten salt through a molten salt loop including an experimental tank, a sump tank, and a drain tank. The fluid level control system further includes a plurality of level sensors, pressure transducers, and electronic pressure regulators fluidically coupled with the fuel salt system. The fluid level control system is configured to receive cover gas pressures in the headspaces of the tanks and calculate target fluid height setpoints for each of the tanks. The fluid level control system further invokes the electronic pressure regulator to iteratively adjust the cover gas pressures of the tanks to achieve and maintain a target fluid level in the experimental tank.

The invention discloses an underground water level monitoring method and system, and belongs to the technical field of water level monitoring, and the method specifically comprises the steps: arranging a pressure sensor and a temperature sensor in to-be-monitored underground water, initializing the sensors, carrying out the calibration, collecting the pressure and temperature data in an underground water well in real time, and carrying out the real-time monitoring of the pressure and temperature data; the height of the underground water level is calculated and corrected according to the pressure and temperature data, filtering calibration processing is conducted on the corrected height of the underground water level, environmental noise and sensor errors are eliminated, modeling and analysis are conducted on stored historical data of the underground water level, and the future change trend of the underground water level is predicted; transmitting the finally estimated underground water level data and the predicted change trend of the underground water level, storing the data in real time and monitoring the data in real time; model parameters can be dynamically adjusted according to historical data, high-precision prediction is performed on short-term and long-term trends of the underground water level, and the method adapts to underground water level characteristics of different regions and different time periods, so that abnormal fluctuation of the underground water level is monitored in real time.

Apparatus and methods for monitoring the status of a floating roof. The floating-roof tank assembly has: an impermeable roof section, and a floating-roof seal configured to span between the impermeable roof section and components of a container. One or more deformable floats are attached to the roof section to provide buoyancy so that the roof floats on top of the liquid contained in the container. To monitor the status of the floating roof tank, it is provided with a fiber optic sensor array comprising one or more fiber optic sensors. A light source configured to transmit light to the fiber optic sensors and a receiver configured to detect light from each fiber optic cable after it has interacted with the fiber optic cable. Based on the received light, a controller configured to process the light received by the receiver to determine the status of the floating roof tank.

The invention belongs to the technical field of water conservancy monitoring, and discloses a water conservancy water level monitoring device and method, and the method comprises the steps: a monitoring point arrangement module of a monitoring mechanism reasonably arranges the number and positions of monitoring points; the flow velocity monitoring module monitors the water velocity; the meteorological data acquisition module acquires meteorological data; the echo sounder emits sound waves, and the water depth is calculated according to the sound wave propagation time and the sound velocity in water; the pressure water level gauge, the laser water level gauge and the radar water level gauge monitor the water level of water conservancy. The echo data analysis module analyzes the echo data; the comprehensive analysis module comprehensively analyzes the water level; the predictive analysis module predicts a water level trend and potential risks. The water level of water conservancy is monitored through various water level gauges, cross validation and high precision are achieved, and the sediment deposition thickness is accurately calculated by analyzing echo data; the comprehensive analysis module comprehensively evaluates the water level; the prediction analysis module integrates various monitoring equipment data and meteorological data, and predicts the water level trend and potential risks.

The invention discloses a monitoring system, belongs to the technical field of liquid level monitoring, and particularly relates to a hot well liquid level remote transmission monitoring system which comprises a signal acquisition unit, an automatic control unit and a cloud platform unit, and the signal acquisition unit is composed of a liquid level acquisition module and a visual module; the liquid level acquisition module and the visual module are used for double acquisition of liquid level values and data processing, filtering processing, temperature compensation processing and vibration compensation processing are carried out on two signals respectively, then data correction is carried out, stable and accurate reading data are obtained, meanwhile, the cloud platform unit is used for achieving real-time display of identification results, and the identification accuracy is improved. According to the system, unmanned and real-time monitoring of the boiler double-color liquid level meter is achieved, meanwhile, the recognition result is stable, and the safety of factory production is guaranteed.

The invention relates to the technical field of liquid level measurement, and particularly discloses a liquid level measuring instrument for a low-temperature container and a using method, and the liquid level measuring instrument comprises a gas phase pipe, a liquid phase pipe and a liquid level meter; the part, extending into the low-temperature container, of the liquid phase pipe comprises a straight pipe section arranged in an inner tank of the low-temperature container; the straight pipe section comprises a hole opening section provided with a first exhaust hole and a light pipe section without a hole, and the end of the light pipe section is a closed end. The drainage cylinder is arranged at the top of the side, close to the opening section, of the light pipe section, and the drainage cylinder is communicated with the light pipe section; the flow guide part is arranged in the flow guide cylinder, the width of the flow guide part is gradually increased from bottom to top, and a flow guide cavity is formed between the flow guide part and the flow guide cylinder; the sealing section is arranged on the side wall of the inner tank in a penetrating manner; one end of the sealing section is connected with the tapping section; the U-shaped air sealing section is arranged in the vacuum interlayer of the low-temperature container, one end is connected with the other end of the sealing section, and the other end is connected with the heating section. The accuracy and the stability of the differential pressure type liquid level instrument used for liquid level measurement of the low-temperature container can be improved.

The invention discloses a water level signal analyzing and processing method and system, and relates to the technical field of water level signal analyzing and processing. Comprising the steps of placing a plurality of water level gauges and collecting water level signals of the water level gauges; performing primary processing on the collected water level signal; verifying the effectiveness of the sampling point of the water level signal and the effectiveness of the measured value; and carrying out secondary processing on the water level signal, and carrying out automatic early warning according to a secondary processing result. The accuracy and timeliness of water level prediction are improved, flood control and reservoir management are facilitated, abnormal water level conditions can be found and handled in time, and disaster risks are reduced.

The invention relates to the technical field of liquid level meters, in particular to a liquid level measuring instrument for a low-temperature and high-pressure container, and aims to solve the problem that when the liquid level of the low-temperature and high-pressure container is measured, measured data are easy to be wrong due to the influence of the pressure and temperature of a medium. Comprising a pressure measuring container; the liquid level meter comprises a gas phase pipe, a liquid phase pipe and a differential pressure transmitter, and one end of the gas phase pipe and one end of the liquid phase pipe are both communicated with the pressure measuring container; a gas-liquid drainage assembly; the differential pressure transmitter is used for measuring the liquid level in the pressure measuring container through the pressure of gas or liquid in the gas phase pipe and the liquid phase pipe, and the gas-liquid drainage assembly is used for separating gas and liquid in the gas phase pipe or the liquid phase pipe. The gas in the low-temperature and high-pressure container enters the gas phase pipe, the liquid in the low-temperature and high-pressure container enters the liquid phase pipe, the gas-liquid drainage assembly can treat media at the gas phase pipe and the liquid phase pipe respectively, and the problem that the media directly enter the gas phase pipe or the liquid phase pipe, and measurement data are unstable due to factors such as pressure fluctuation is solved.

The invention discloses a rock hydraulics-based high-position separation water monitoring and drainage control method, which comprises the following steps of: determining a separation water development position according to an early-stage exploration result; a monitoring drill hole and a drainage drill hole which are communicated with the separation water are constructed on the ground surface above the development position of the separation water; a water pressure sensor is arranged at the bottom in the monitoring drill hole; a water suction pump is arranged in the drainage drill hole; a plurality of micro-seismic sensors are arranged in a roof rock stratum of the working face at set intervals, and the development height of the water flowing fractured zone is determined according to micro-seismic signals collected by the micro-seismic sensors; determining the thickness of a separation layer water-resisting layer according to the development height of the water flowing fractured zone; determining an abscission water warning water head according to the thickness of the abscission water water-resisting layer; determining a warning water level according to the separation water warning water head and the separation water bottom plate elevation obtained through early-stage exploration, and setting the determined separation water warning water level as an early warning water level; the water level data in the monitoring drill hole are collected in real time, the real-time water level is obtained, when the real-time water head exceeds the early warning water level, the water suction pump is started to pump separation water, and separation water level control is achieved.

The utility model discloses a water purifier for detecting the liquid level through pressure sensors, and relates to the technical field of liquid level detection of water purifiers, the water purifier comprises a water purifier water tank and a water pipe fixedly arranged on the lower portion, micro pressure sensors are arranged on the two sides of the water pipe, a square head fixedly connected with the water pipe is arranged on the lower portion of the water purifier water tank, and a plurality of transverse shafts A are slidably arranged in the middles of the two sides of the square head; clamping mechanisms are arranged at the two ends of each transverse shaft A, two transverse fixing plates fixedly penetrate through the two ends of each transverse shaft A, sealing plugs A are fixedly arranged in the middles of the surfaces of the opposite sides of the transverse fixing plates, transverse shafts B are fixedly arranged in the middles of the surfaces of the sides of the sealing plugs A, and sealing plugs B are fixedly arranged at one ends of the transverse shafts B. The problems that real-time continuous linear detection cannot be achieved, the detection precision is not high, high-precision liquid level detection cannot be achieved, more functions cannot be provided on the water purifier, and replacement is inconvenient are solved.

A system, including for automatically detecting, monitoring and / or controlling loading of explosive material in a borehole during commercial blasting operations, including: a sensor component with a sensor element including at least one sensor configured to automatically determine a depth of the sensor element in fluid explosive material in a borehole; and a depth component configured to automatically determine a relative depth of the sensor element in the borehole relative to a fluid outlet while the fluid outlet is loading the fluid explosive material in the borehole.

The invention provides an underwater robot self-positioning platform based on multi-feature and multi-modal information fusion, and the platform is installed on an underwater robot, and comprises a visual sensing module which is used for collecting image information of an underwater environment, and extracting visual point features and visual line features from the image information; the acoustic measurement module is used for providing three-axis speed information and low-frequency pose information of the underwater robot based on the Doppler principle; the pressure measuring module is used for measuring water depth information of the underwater robot on the basis of a fluid statics principle; and the data processing and optimizing module is used for fusing the visual point features, the visual line features, the three-axis speed information, the low-frequency pose information and the water depth information on the basis of a factor graph optimizing framework so as to realize positioning and mapping. Compared with a traditional system, the self-positioning platform provided by the invention realizes tight coupling joint optimization of point-line features and acoustics and pressure sensor information, can stably operate in extreme underwater environments with low texture, turbidity and the like, and realizes high-precision underwater synchronous positioning and map construction.

A fuel system includes a chamber for storing a fuel, an optical differential pressure sensor, and one or more processors in communication with the optical differential pressure sensor. The optical differential pressure sensor is fluidically connected to the chamber and is configured to, when the fuel is stored in the chamber, output a signal indicative of a pressure difference in the optical differential pressure sensor to the one or more processors.

A tank monitor control system, device and methods are disclosed that are suitable for remote monitoring. The device comprises a monitoring unit for insertion into a fluid holding device or tank to monitor a level of fluid stored in the fluid holding device. The monitoring unit comprises at least one sensor and a communication device for transmitting the data. Additional functionalities include location data, temperature data, water quality properties, and a pressure device for measuring pressure and calculating the weight of the fluid. The system provides automatic data generation and user defined alerts along with the ability to use artificial intelligence.

Methods, apparatus, and systems for determining a level of a liquid in a liquid-containing vessel are disclosed. The liquid-containing vessel may be fluidically connected to a displacer cage. The method may include obtaining, with a load measurement device, a weight force of a displacer suspended from the load measurement device and disposed within the displacer cage. The method may also include submerging the displacer into the liquid and obtaining, with the load measurement device, a net force acting on the displacer. The method may further include obtaining, with a liquid density measurement sensor disposed within the displacer cage, a liquid density at a first location of the liquid. The method may still further include determining, using, at least, the net force and the liquid density at the first location of the liquid, the level of the liquid in the vessel.

The invention discloses a river water level detection method, and relates to the technical field of computer processing, and the method comprises the following steps: S01, presetting a distributed pressure sensor array in each target collection region to obtain underwater pressure data k and real-time water flow data v of a plurality of target collection regions of a river to be detected; s02, establishing a dynamic pressure water level model based on the water flow direction pressure conduction quantity estimation of the plurality of target acquisition areas in combination with real-time water flow velocity and wave period parameters; s03, performing signal attenuation compensation on the underwater pressure data according to the dynamic pressure water level model to obtain initial water level data; s04, multi-source data fusion calibration is carried out on the preliminary water level data, a river water level detection result is generated, and the result comprises a wave height frequency spectrum and a water level change curve after peak elimination correction; and S05, generating a wave energy spectral density map according to the calibrated water level data, performing real-time comparison according to the wave energy spectral density map and a preset threshold value, and performing result return according to a comparison structure. The small-wave-height short-period wave measurement precision and the water level detection reliability are remarkably improved, the intelligent flood prevention early warning and dynamic adjusting capacity is achieved, and it is guaranteed that data collection is accurate and consistent.

The invention discloses an oil level detection method and system based on correlation analysis, and relates to the technical field of oil level detection.The method comprises the following steps that a static pressure signal in a transformer oil tank is collected and preprocessed; the preprocessed static pressure signal is input into a preset programmable logic controller, and the initial oil level height is calculated; performing correlation analysis on the characteristics of the transformer, the environment temperature and the oil level height to obtain influence data of the oil level height; and an oil level height deviation model is constructed according to the influence data of the oil level height, a correction factor of the oil level height is obtained, and the initial oil level height is corrected to obtain the final oil level height. According to the method, the oil level height influence coefficient is obtained through correlation analysis and is used for correcting the oil level height, so that more comprehensive and accurate detection of the oil level height is realized, the real condition of the oil level in the actual operation of the transformer can be reflected more accurately, and potential problems can be found in advance and effective measures can be taken.

The invention relates to a liquid level measurement and correction method for a reactor pressure vessel. The method comprises the following steps: dividing the pressure vessel into a plurality of measurement intervals along a pressure difference direction; acquiring first measurement data of the pressure vessel, calculating the initial measurement liquid level height of the pressure vessel according to the first measurement data, assigning the initial measurement liquid level height to the variable liquid level height to be corrected, judging the measurement interval and correcting; according to the corrected liquid level height and the to-be-corrected liquid level height before correction, the measurement intervals where the corrected liquid level height and the to-be-corrected liquid level height are located are compared, when the corrected liquid level height and the to-be-corrected liquid level height belong to different measurement intervals, the to-be-corrected liquid level height is replaced with the current corrected liquid level height, and the latest to-be-corrected liquid level height continues to be corrected; when the latest corrected liquid level height and the latest to-be-corrected liquid level height are located in the same measurement interval, the latest corrected liquid level height is used as the liquid level height of the coolant in the pressure container; on-line correction of the liquid level of the coolant in the pressure container can be achieved, and the liquid level characterization precision is improved.

A container for pressurized fluid, in particular a gas cylinder, having a given internal volume, having a fluid distribution valve having a member for selecting the flow rate, which can be manipulated by a user, a position sensor configured to detect the position of the member for adjusting flow rate, and an electronic device having a means for measuring pressure and temperature, a microprocessor-based data processing means that are configured to calculate a remaining fluid on the basis of pressure and temperature measurements, of the position of the member for selecting the flow rate and of the internal volume of the container, a timer, and display means for displaying an updated remaining fluid.

The invention relates to an anti-interference intelligent liquid level transmitter system which comprises a measuring unit used for acquiring an original liquid level signal; the anti-interference processing unit is in signal connection with the measuring unit and is used for executing anti-interference algorithm processing on the original liquid level signal, and the anti-interference algorithm processing includes adopting an acceleration compensation algorithm and a dynamic filtering algorithm to eliminate measuring errors caused by mechanical vibration and medium flow; and the output unit is in signal connection with the anti-interference processing unit and is used for outputting the standardized liquid level signal. The problem that a traditional static filtering algorithm cannot adapt to a dynamically changing vibration environment in real time is solved.

The invention discloses a system for realizing liquid level calibration of a low-temperature liquid nitrogen biological container through pressure difference. The system comprises a liquid nitrogen container, a nitrogen filling device, an initialization module, a pressure difference measurement module, a liquid level calculation module, a processing module, a communication interface and a display terminal, after the system is initialized, nitrogen with a fixed volume is filled into the liquid nitrogen container through the nitrogen filling device, and the air pressure difference after inflation is measured and recorded; after each inflation, calculating the difference value between the volume of the liquid nitrogen container and the air pressure difference, and organizing into a pressure difference change data set; based on the data set, the liquid level calculation module calculates the relation between the actual volume of the liquid nitrogen container and the liquid level height; the processing module receives the liquid level height information and performs abnormity verification; the communication interface and the display terminal realize visual display of liquid level height information including a real-time curve, an information set and an abnormal alarm; according to the system, the liquid level change in the liquid nitrogen container is indirectly deduced by controlling the volume of filled nitrogen and monitoring the air pressure difference change, and non-contact liquid level calibration is achieved.

The utility model provides a transformer intelligent cooling visualization measurement and control system. The transformer intelligent cooling visualization measurement and control system comprises a transformer body, a transformer cooler, a transformer body monitoring unit, a transformer cooler monitoring unit, an environment monitoring unit, a controller, a communication unit and a man-machine interaction unit. The transformer main body monitoring unit is arranged on the transformer main body; the transformer cooler monitoring unit is arranged on the transformer cooler; the environment monitoring unit is used for at least obtaining the temperature of the external environment. The controller is connected with the transformer cooler, the transformer main body monitoring unit, the transformer cooler monitoring unit and the environment monitoring unit; and the man-machine interaction unit is connected with the controller through the communication unit. According to the utility model, the problems that the traditional cooling control system does not comprehensively detect and judge the transformer, the transformer cooler and the surrounding environment and cannot effectively judge the operation safety of the transformer and preventively prompt faults are solved.

The invention discloses a pipe network safety monitoring method and device, and the method comprises the steps: obtaining a topological structure and historical liquid level data of a target pipe network, and dividing the target pipe network into a plurality of pipe network sub-regions; based on a preset monitoring period, obtaining a radar liquid level value and a pressure liquid level value of the pipe network sub-region, and generating a fusion liquid level value of the pipe network sub-region; in response to the fact that the fusion liquid level value of the pipe network sub-area is larger than a preset liquid level early warning value, it is judged that the pipe network sub-area is a liquid level abnormal area, multiple associated sub-areas of the liquid level abnormal area are determined, and the liquid level trend of the liquid level abnormal area is compared with the liquid level trend of the multiple associated sub-areas; and in response to the fact that the multiple associated sub-regions are consistent with the liquid level trend of the abnormal liquid level region, judging that the abnormal liquid level region is an early warning triggering region, and correspondingly generating a safety alarm. By adopting the method and the device, the multi-source liquid level data and the pipe network topological structure can be combined, the internal interference characteristics of the pipe network are considered, and global analysis is performed, so that the accuracy of liquid level monitoring is improved, and the reliability of safety alarm is improved.

The invention belongs to the technical field of ocean sampling, and provides a pneumatic throwing type multi-channel self-sinking and floating trace seawater sampling device and a pneumatic throwing type multi-channel self-sinking and floating trace seawater sampling method. The device comprises a portable gas cylinder, a casting track, a self-sinking and floating type trace seawater sampler shell, a fixing frame, a pressure sensor, a control bin and the like, and after a seawater sample is collected, a fixing agent can be injected into the seawater sample to fix microorganisms in the seawater sample and the like. And the self-sinking and floating trace seawater sampler is far away from the trace element precipitation influence area of the scientific investigation ship in a pneumatic throwing manner. Meanwhile, the seawater sampling valve with the engineering plastic valve core and the flow channel is innovatively designed, and the seawater sample bin and the fixing agent bin on the inner surface are coated with engineering plastic, so that the interference caused by trace element precipitation of a metal structure of the sampler in the prior art is avoided.

The utility model relates to the technical field of transmitters, and discloses a remote transmission type liquid level differential pressure transmitter which comprises a transmitter body, the outer surface of the transmitter body is fixedly communicated with two extension pipes, capillary pipes are placed on the left side and the right side of the transmitter body, and the output ends of the two capillary pipes are connected with the extension pipes close to the capillary pipes in an inserted mode. The outer surfaces of the two extension pipes are both slidably connected with sliding rings, and the side faces, away from each other, of the two sliding rings are both fixedly connected with a set of swing pieces. According to the remote transmission type liquid level differential pressure transmitter, the capillary tube can be limited by installing the swing piece, so that the capillary tube can be stably connected with the extension tube in an inserted mode, and the situation that the capillary tube and the extension tube are loosened and use of the transmitter body is affected is avoided; and through cooperation of the mounting fixing frame, the clockwork spring and the rotating cylinder, the used capillary tube can be automatically wound, so that the capillary tube can be uniformly wound in the fixing frame, the purpose of automatically winding the capillary tube is achieved, and the phenomenon that the capillary tube is knotted due to disorder is avoided.

The invention discloses water sample collection equipment capable of simultaneously collecting multiple layers of water samples, which comprises a sampling shell, a plurality of sampling cylinders are arranged in the sampling shell along the vertical direction, sampling pipes are arranged on the bottom surfaces of the sampling cylinders, and the tail ends of the sampling pipes extend out of the sampling shell; a sealing mechanism is arranged in the sampling cylinder and is used for sealing the sampling pipe; the top of the side wall of the sampling cylinder is communicated with a communicating pipe, the tail end of the communicating pipe extends to the outer side of the sampling shell, and an electromagnetic valve is mounted on the communicating pipe; a plurality of pressure gauges are mounted on the outer wall of the sampling shell, are in one-to-one correspondence with the sampling cylinders, and are used for detecting pressure values in the sampling cylinders; a controller is arranged on each pressure gauge, and the pressure gauges and the electromagnetic valves are electrically connected with the controllers; a lifting lug used for being connected with a traction rope is fixedly arranged at the top end of the sampling shell. According to the invention, sampling work on different water layers can be realized, and a water sample can be prevented from entering the sampling cylinder before reaching a specified sampling depth.