A portable intelligent low-disturbance sampling device

Abstract

The present invention discloses a portable intelligent low-disturbance sampling device, which includes a power supply device, a low-disturbance pumping device, a sealing device, a downhole monitoring device, a true value determination and sampling device, and an automatic controller. The low-disturbance pumping device includes a sampling pump, a sampling pipe, a cable, and a frequency conversion controller, and is used to complete the task of low-disturbance sampling of groundwater; the true value determination and sampling device is used for the flow of water samples and to judge whether the collected water samples are true water samples of the formation; the downhole monitoring device is used to measure the downhole water level and water temperature data; the low-disturbance pumping device, the downhole monitoring device, and the true value determination and sampling device all need to be connected to the power supply device through the automatic controller via a cable or a data line; the present invention has a small disturbance to the underground aquifer, can meet the collection requirements of detection samples such as inorganic components, organic components, microorganisms, dissolved oxygen, etc., and has a true value determination function, and can analyze parameters such as TDS, PH, dissolved oxygen, etc. of the water sample.

Description

Technical Field

[0001] The present invention relates to the technical field of water sampling and detection, and particularly to a portable, intelligent and low-disturbance sampling device. Background Art

[0002] Sampling and monitoring equipment is a basic link in the groundwater pollution monitoring network and one of the key links determining the accuracy of groundwater pollution monitoring. The traditional single mixed layer sampling method is greatly affected by the seasonal variation of groundwater flow direction or precipitation fluctuation. Moreover, there are large-area drawdown funnels in the groundwater in the Beijing-Tianjin-Hebei region, and the fluctuation is significant under the influence of precipitation, which cannot meet the requirements for describing groundwater pollution plumes and pollution levels.

[0003] During the groundwater sampling process, how to obtain representative groundwater samples from monitoring wells completely and efficiently is the focus and difficulty of the sampling work. Scholars at home and abroad have respectively devoted a lot of energy to the research of this technology. Traditional groundwater sampling instruments (Bailer tubes, grab samplers, gas displacement samplers, bladder pumps, peristaltic pumps, electric submersible pumps, inertial lift pumps, etc.) repeatedly cross or strongly agitate the aquifer during the groundwater sampling process, resulting in large disturbances, volatilization of organic pollutants contained in the water, and cross-contamination of groundwater samples between different strata or aquifers, so that the obtained water samples are not sufficient to represent the actual pollution situation at a certain depth.

[0004] Therefore, it is urgent to develop a portable, intelligent and low-disturbance sampling device to improve the groundwater pollution sampling and monitoring technology level in China and provide technical support for correctly evaluating the groundwater pollution situation. Summary of the Invention

[0005] The purpose of the present invention is to provide a portable, intelligent and low-disturbance sampling device to solve the problems existing in the above-mentioned prior art, with less disturbance to the underground aquifer, capable of meeting the collection requirements of detection samples such as inorganic components, organic components, microorganisms, dissolved oxygen, etc., and having a true value determination function, capable of analyzing parameters such as TDS, PH, dissolved oxygen, etc. of water samples.

[0006] To achieve the above purpose, the present invention provides the following solutions:

[0007] The present invention provides a portable intelligent low-disturbance sampling device, which includes a power supply device, a low-disturbance pumping device, a sealing device, a downhole monitoring device, a true value determination and sampling device, and an automatic controller. The low-disturbance pumping device includes a sampling pump, a sampling pipe, a cable, and a frequency conversion controller, and is used to complete the task of low-disturbance sampling of groundwater. The sampling pump is connected to the true value determination and sampling device through the sampling pipe. The sealing device is arranged in the well to seal the target water-bearing layer from other non-target aquifers. The true value determination and sampling device includes a water sample flow-through pool, a low-disturbance sampling area, and a water quality detection probe, and is used for water sample flow-through and judging whether the collected water sample is the true water sample of the formation. The downhole monitoring device includes a water level and water temperature monitoring probe and a data line, and is used to measure the downhole water level and water temperature data. The low-disturbance pumping device, the downhole monitoring device, and the true value determination and sampling device are all connected to the power supply device through the cable or data line via the automatic controller.

[0008] Preferably, the drainage port of the sampling pump is connected to the water inlet of the sampling pipe, the water outlet of the sampling pipe is communicated with the true value determination and sampling device through the sealing device, and the sampling pump is connected to the frequency conversion controller through the cable.

[0009] Preferably, the sampling pump is a screw submersible pump with an outer diameter ≤ 50 mm.

[0010] Preferably, the sampling pipe includes a polytetrafluoroethylene water pipe, a steel wire rope and a cable wrapped around the polytetrafluoroethylene water pipe with polytetrafluoroethylene tape, and the sampling pipe is controlled to be retracted and extended by a winch.

[0011] Preferably, the frequency conversion controller is used to adjust the water pump flow rate, realize large-flow well flushing and low-flow sampling, reduce the sampling auxiliary time, and reduce the disturbance to the water sample.

[0012] Preferably, the sealing device includes an inflatable packer, a high-pressure pipeline and a gas supply source. The inflatable packer includes an upper joint, a lower joint, a rubber cylinder and a central pipe. The rubber cylinder is sleeved outside the central pipe. The rubber cylinder is connected to the gas supply source through the high-pressure pipeline. The upper joint is threadedly connected to the top of the central pipe, the lower joint is threadedly connected to the lower end of the central pipe, the lower joint and the lower end of the central pipe are sealed by an O-ring, and the pipe body of the sampling pipe passes through the upper joint, the lower joint and the central pipe.

[0013] Preferably, the body of the true value determination and sampling device is a box in the shape of a cuboid. The box is provided with a water inlet, a drain outlet, an overflow outlet and a monitoring window, all of which are circular. The water inlet is arranged at the middle position on one side of the box. The drain outlet and the overflow outlet are arranged on the other side of the box, and the overflow outlet is located at the top of the drain outlet. The water inlet is connected to the water outlet of the sampling pipe. The drain outlet is provided with a solenoid valve for controlling drainage. The drain outlet and the overflow outlet are connected with a polytetrafluoroethylene drainage pipe. A water quality detection probe is placed in the monitoring window, and an O-ring is used to seal the monitoring window.

[0014] Preferably, a baffle is arranged inside the box. The baffle is arranged horizontally and divides the box into a water sample flow-through pool and a low-disturbance sampling area. The water sample flow-through pool is arranged at the bottom of the low-disturbance sampling area. The water quality detection probe is located in the water sample flow-through pool and is used to determine the true value of the water sample. Several sampling bottles are placed in the low-disturbance sampling area for low-disturbance water sample collection.

[0015] Preferably, the indicators that the water quality detection probe can detect are pH value, temperature, conductivity, oxidation-reduction potential, dissolved oxygen and turbidity.

[0016] Preferably, the automatic controller includes a water pump control switch, a frequency converter frequency modulation unit, a monitoring probe power supply unit, a liquid crystal display screen, a solenoid valve control unit, a storage system, an alarm unit and a Bluetooth module. Among them, the water pump control switch is used to control the start and stop of the sampling pump; the frequency converter frequency modulation unit uses an RS485 serial port to adjust the frequency of the frequency converter controller to control the flow rate of the sampling pump; the monitoring probe power supply unit includes two power supply units for supplying power to the water level and water temperature monitoring probe and the water quality detection probe; the water level and water temperature monitoring probe uses 4 wires with a voltage of 9V, and the water quality detection probe uses 4 wires with a voltage of 12V, both using RS485 serial ports; the power supply voltage of the solenoid valve control unit is 12V and is used to control the start and stop of the solenoid valve; the storage system is used to store the water quality detection data during the sampling process; the alarm unit is used to prompt the operator of the sampling process, and the Bluetooth module can use an RS485 / 232 serial port communication to transmit the sampling and water quality detection data to the mobile phone APP for remote viewing; the liquid crystal display screen is used to display parameters such as pH value, temperature, conductivity, oxidation-reduction potential, dissolved oxygen and turbidity.

[0017] The present invention has achieved the following beneficial technical effects compared with the prior art:

[0018] 1. The portable intelligent low-disturbance sampling device provided by the present invention causes less disturbance to the groundwater aquifer and can meet the sampling requirements of detection samples such as inorganic components, organic components, microorganisms, dissolved oxygen, etc., and can efficiently and completely obtain representative groundwater samples of each layer from the monitoring well.

[0019] 2. The portable intelligent low-disturbance sampling device provided by the present invention does not contact air during the sampling process, which can effectively reduce the interference of the external environment on the water sample.

[0020] 3. The portable intelligent low-disturbance sampling device provided by the present invention has the advantages of being easy to carry, simple to install, and easy to transport, and is applicable to a depth within 120m.

[0021] 4. The portable intelligent low-disturbance sampling device provided by the present invention has the functions of automatic control and intelligent monitoring. It can intelligently analyze and automatically control the sampling process according to the sampling data, reducing the interference of human factors, saving time and effort; at the same time, it also has a data transmission function and can receive water sample analysis data through the mobile phone APP.

[0022] 5. The portable intelligent low-disturbance sampling device provided by the present invention can be connected to a packer for stratified sampling of groundwater. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic structural diagram of the portable intelligent low-disturbance sampling device in the present invention;

[0025] Figure 2 It is a schematic structural diagram of the true value determination and sampling device in the present invention;

[0026] In the figure: 1 - power supply device, 2 - true value determination and sampling device, 3 - automatic controller, 4 - winch, 5 - sampling pump, 6 - sampling pipe, 7 - cable, 8 - frequency conversion controller, 9 - water level and water temperature monitoring probe, 10 - data line, 11 - inflatable packer, 12 - high-pressure pipeline, 13 - gas supply source, 14 - upper joint, 15 - lower joint, 16 - rubber cylinder, 17 - central pipe, 18 - box body, 19 - water inlet, 20 - drain outlet, 21 - overflow outlet, 22 - monitoring window, 23 - baffle, 24 - water sample flow pool, 25 - low-disturbance sampling area, 26 - cover plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] The purpose of the present invention is to provide a portable intelligent low-disturbance sampling device to solve the problems existing in the prior art.

[0029] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] The portable intelligent low-disturbance sampling device in this embodiment, as Figure 1 shown, includes a power supply device 1, a low-disturbance pumping device, a sealing device, a downhole monitoring device, a true value determination and sampling device 2, and an automatic controller 3. The low-disturbance pumping device includes a sampling pump 5, a sampling pipe 6, a cable 7, and a variable frequency controller 8, which is used to complete the task of low-disturbance sampling of groundwater. The sampling pump 5 is connected to the true value determination and sampling device 2 through the sampling pipe 6. The sealing device is arranged in the well to seal the target water-bearing layer from other non-target aquifers. The true value determination and sampling device 2 includes a water sample circulation pool 24, a low-disturbance sampling area 25, and a water quality detection probe, which is used for water sample circulation and judging whether the collected water sample is the true water sample of the formation. The downhole monitoring device includes a water level and water temperature monitoring probe 9 and a data line 10, which is used to measure the downhole water level and water temperature data. The low-disturbance pumping device, the downhole monitoring device, and the true value determination and sampling device 2 all need to be connected to the power supply device 1 through the cable or data line by the automatic controller 3.

[0031] In this specific embodiment, the drainage port 20 of the sampling pump 5 is connected to the water inlet of the sampling pipe 6. The water outlet of the sampling pipe 6 is communicated with the true value determination and sampling device 2 through the sealing device. The sampling pump 5 is connected to the variable frequency controller 8 through the cable 7. The variable frequency controller 8 is used to adjust the water pump flow rate, realize large-flow well washing and low-flow sampling, reduce the sampling auxiliary time, and reduce the disturbance to the water sample. The sampling pump 5 is a screw submersible pump with an outer diameter ≤ 50mm. It belongs to a positive displacement rotary pump and relies on the volume change of the sealing cavity formed by the screw and the bushing to inhale and discharge liquid. The flow rate is stable, uniform, and continuous, the outlet pressure is stable, and no eddy current will be formed when transporting the medium.

[0032] In this specific embodiment, the sampling tube 6 includes a polytetrafluoroethylene water pipe, a steel wire rope and a cable wrapped around the polytetrafluoroethylene water pipe with polytetrafluoroethylene tape, so as to reduce the influence on the water quality of the water sample. The sampling tube 6 is controlled by the winch 4 for retracting and extending. The fixed end of the steel wire rope is connected to the winch 4, and the parts of the cable and the polytetrafluoroethylene water pipe that are not tied together extend from the winch 4 and are respectively connected to the frequency conversion controller 8 and the true value determination and sampling device 2.

[0033] In this specific embodiment, the packer device includes an inflatable packer 11, a high-pressure pipeline 12 and a gas supply source 13. The inflatable packer 11 includes an upper joint 14, a lower joint 15, a rubber cylinder 6 and a central pipe 17. The rubber cylinder 6 is sleeved outside the central pipe 17. The rubber cylinder 6 is connected to the gas supply source 13 through the high-pressure pipeline 12. The upper joint 14 is threadedly connected to the top of the central pipe 17, and the lower joint 15 is threadedly connected to the lower end of the central pipe 17. The lower joint 15 and the lower end of the central pipe 17 are sealed by an O-ring. The pipe body of the sampling tube 6 passes through the upper joint 14, the lower joint 15 and the central pipe 17. When the inflatable packer 11 needs to be packed, the gas in the gas supply source 13 is inflated into the rubber cylinder 6 through an air pump, so that the rubber cylinder 6 expands to play a packing role.

[0034] As Figure 2 shown, the main body of the true value determination and sampling device 2 is a box body 18 in the shape of a cuboid. The box body 18 is provided with a water inlet 19, a drain outlet 20, an overflow outlet 21 and a monitoring window 22, all of which are circular; the water inlet 19 is arranged at the middle position on one side of the box body 18, the drain outlet 20 and the overflow outlet 21 are arranged on the other side of the box body 18, and the overflow outlet 21 is located at the top of the drain outlet 20; the water inlet 19 is connected to the water outlet of the sampling tube 6, and the drain outlet 20 is provided with a solenoid valve for controlling drainage; the drain outlet 20 and the overflow outlet 21 are connected with a polytetrafluoroethylene drainage pipe. A water quality detection probe (not shown in the figure) is placed in the monitoring window 22, and the monitoring window 22 is sealed with an O-ring. A baffle 23 is arranged inside the box body 18. The baffle 23 is arranged horizontally and divides the box body 18 into a water sample flow-through pool 24 and a low-disturbance sampling area 25. The water sample flow-through pool 24 is arranged at the bottom of the low-disturbance sampling area 25. The water quality detection probe is located in the water sample flow-through pool 24. The water quality detection probe is used for true value determination of the water sample. Multiple placement slots can be arranged on the baffle 23 so that several sampling bottles can be placed in the low-disturbance sampling area 25 for low-disturbance collection of water samples. By setting the water quality detection probe, the pH value, temperature, conductivity, oxidation-reduction potential, dissolved oxygen and turbidity of the water sample are detected.

[0035] In this specific embodiment, the automatic controller 3 includes a water pump control switch, a frequency converter frequency modulation unit, a monitoring probe power supply unit, a liquid crystal screen, a solenoid valve control unit, a storage system, an alarm unit and a Bluetooth module, wherein the water pump control switch is used to control the start and stop of the sampling pump 5; the frequency converter frequency modulation unit adopts an RS485 serial port to adjust the frequency of the frequency converter controller 8 to control the flow rate of the sampling pump 5; the monitoring probe power supply unit includes two power supply units for supplying power to the water level and water temperature monitoring probe 9 and to the water quality detection probe; the water level and water temperature monitoring probe 9 adopts 4 wires, The voltage is 9V, the water quality detection probe uses 4 wires, the voltage is 12V, and both use RS485 serial port; the power supply voltage of the solenoid valve control unit is 12V, which is used to control the start and close of the solenoid valve; the storage system is used to store the water quality detection data during the sampling process; the alarm unit is used to remind the operator of the sampling process, and the Bluetooth module can use RS485 / 232 serial port communication to transmit the sampling and water quality detection data to the mobile phone APP for remote viewing; the LCD screen is used to display pH value, temperature, conductivity, redox potential, dissolved oxygen and turbidity parameters.

[0036] The method for using the portable, intelligent, low-disturbance sampling device of the present invention comprises the following steps:

[0037] A. According to the sampling requirements, the water outlet of the sampling pump 5 is connected to the water inlet of the sampling tube 6 in turn, the water outlet of the sampling tube 6 is connected to the water inlet 19 of the truth value judgment and sampling device 2, and the cable 7 of the sampling pump 5 is connected to the frequency conversion controller 8; the water level and water temperature monitoring probe 9 is fixed about 20 cm above the connection joint between the sampling tube 6 and the sampling pump 5, and the data line 10 of the water level and water temperature monitoring probe 9 is fixed on the sampling tube 6 line; the water outlet of the truth value judgment and sampling device 2 is installed with a solenoid valve and connected to the drainage pipeline, and the overflow port 21 is directly connected to the polytetrafluoroethylene drainage pipeline; the water quality detection probe is placed in the monitoring window 22, and the monitoring window 22 is sealed with an O-ring; the low-disturbance pumping device, the downhole monitoring device, the truth value judgment and sampling device 2 must be connected to the power supply device 1 through the cable 7 or the data line 10 through the automatic control device.

[0038] B. After the equipment is connected, the sampling pump 5 and the water level and temperature monitoring probe 9 are lowered into the well to the sampling position. After reaching the predetermined position, the pipeline is fixed to the wellhead by a clamping device.

[0039] C. Turn on the power supply device 1, start the sampling pump 5 through the automatic control device, and control the frequency conversion controller 8 to adjust the flow rate to the maximum to complete the well washing work before sampling. At the same time, monitor the water level changes through the water level and water temperature monitoring probe 9, which can not only prevent the water level from being lower than the water inlet 19 of the sampling pump 5, but also guide the operator to adjust the flow rate of the sampling pump 5 according to the water level drop to ensure the normal water discharge of the sampling pump 5.

[0040] D. After the sampling pump 5 fills with water normally, close the solenoid valve at the drain port 20, store water in the water sample flow cell 24 until the water level in the box body 18 submerges the water quality detection probe, and the water quality detection probe starts to work. Set the start of the true value determination of the water sample according to the detection time (different time intervals of 30 min, 15 min, 10 min, 5 min, 3 min, and 1 min can be selected). After the true value determination is completed, feedback the sampling data to the storage unit of the automatic control system and send it to the mobile APP through the Bluetooth module. After waiting for the automatic control system to store and send the sampling data, control the solenoid valve at the drain port 20 to open for drainage. Thus, the first round of sampling work is completed.

[0041] E. After the first round of sampling work is completed and the set sampling time interval is reached, the automatic control system starts the second sampling work. First, close the solenoid valve at the drain port 20 and store water in the water sample flow cell 24 again, repeating the first round of sampling work. After completing 3 rounds of sampling work in sequence, the automatic control system compares the data of the three samplings until three conditions among the detection indicators (pH value, temperature, conductivity, oxidation-reduction potential, dissolved oxygen, and turbidity) meet the sampling standards. The pH stability standard is within ±0.1, the temperature stability index is within ±0.5 °C, the conductivity stability index is within ±10%, the oxidation-reduction potential stability index is within ±10 mV or within ±10%, the dissolved oxygen stability index is within ±0.3 mg / L or within ±10%, and the turbidity stability index is ≤10 NTU or within ±10%. If the sampling standards are not met, the automatic control system will continue to carry out the next round of sampling.

[0042] F. After meeting the sampling standards, the automatic control system will open the solenoid valve at the drain port 20 for drainage, clean the sampling bottle at the drain port 20. After the cleaning is completed, open the cover plate 26 above the low-disturbance sampling area 25, place the sampling bottle on the baffle 23 of the low-disturbance sampling area 25, and close the cover plate 26.

[0043] G. The automatic control system controls the solenoid valve at the drain port 20 to close and reduces the flow rate to 0.1 - 0.5 L / min through the frequency converter controller 8. As the liquid level gradually rises and exceeds the mouth of the sampling bottle, the water sample slowly submerges into the sampling bottle until it overflows the mouth of the sampling bottle (it can also be judged by the water flowing out from the overflow port 21), and the sampling is completed. Then, the automatic control device opens the solenoid valve at the drain port 20 for drainage, controls the sampling pump 5 and other monitoring devices to close, and the sampling is over. The equipment in the well can be taken out.

[0044] The mechanism of the portable intelligent low-disturbance sampling device and method of the present invention is as follows: Through the automatic control system, intelligent management is carried out on the sampling device, monitoring device, and data storage and transmission. It can not only perform low-disturbance sampling, obtain representative groundwater samples from the monitoring well completely and efficiently, meet the sampling requirements for inorganic components, organic components, microorganisms, dissolved oxygen, etc., but also can perform intelligent analysis on the sampling data, control the sampling process, which is of great significance for groundwater pollution monitoring.

[0045] The present invention uses specific examples to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A portable intelligent low-disturbance sampling device, characterized in that: It includes a power supply device, a low-disturbance pumping device, a packer device, a downhole monitoring device, a true value determination and sampling device, and an automatic controller. The low-disturbance pumping device includes a sampling pump, a sampling pipe, a cable, and a variable-frequency controller, and is used to complete the task of low-disturbance sampling of groundwater. The sampling pump is connected to the true value determination and sampling device through the sampling pipe. The packer device is arranged in the well to isolate the target water-bearing layer from other non-target aquifers. The true value determination and sampling device includes a water sample flow-through cell, a low-disturbance sampling area, and a water quality detection probe, and is used for water sample circulation and judging whether the collected water sample is the true water sample of the formation. The downhole monitoring device includes a water level and water temperature monitoring probe and a data line, and is used to measure the downhole water level and water temperature data. The low-disturbance pumping device, the downhole monitoring device, and the true value determination and sampling device are all connected to the power supply device through the cable or data line via the automatic controller. The packer device includes an inflatable packer, a high-pressure pipeline, and a gas supply source. The inflatable packer includes an upper joint, a lower joint, a rubber barrel, and a central pipe. The rubber barrel is sleeved outside the central pipe. The rubber barrel is connected to the gas supply source through the high-pressure pipeline. The upper joint is threadedly connected to the top of the central pipe. The lower joint is threadedly connected to the lower end of the central pipe. The lower joint and the lower end of the central pipe are sealed by an O-ring. The pipe body of the sampling pipe passes through the upper joint, the lower joint, and the central pipe. The body of the true value determination and sampling device is a cuboid-shaped box. The box is provided with an inlet, a drain, an overflow port, and a monitoring window, all of which are circular. The inlet is arranged at the middle position on one side of the box. The drain and the overflow port are arranged on the other side of the box, and the overflow port is located above the drain. The inlet is connected to the outlet of the sampling pipe. The drain is provided with a solenoid valve for controlling drainage. The drain and the overflow port are connected with a polytetrafluoroethylene drainage pipe. A water quality detection probe is placed in the monitoring window, and the monitoring window is sealed with an O-ring. A baffle is arranged inside the box. The baffle is arranged horizontally and divides the box into a water sample flow-through cell and a low-disturbance sampling area. The water sample flow-through cell is arranged at the bottom of the low-disturbance sampling area. The water quality detection probe is located in the water sample flow-through cell. The water quality detection probe is used to determine the true value of the water sample. Several sampling bottles are placed in the low-disturbance sampling area for low-disturbance collection of water samples.

2. The portable intelligent low-disturbance sampling device according to claim 1, characterized in that: The drain of the sampling pump is connected to the inlet of the sampling pipe. The outlet of the sampling pipe is communicated with the true value determination and sampling device through the packer device. The sampling pump is connected to the variable-frequency controller through a cable.

3. The portable intelligent low-disturbance sampling device according to claim 1, characterized in that: The sampling pump is a screw submersible pump with an outer diameter ≤ 50 mm.

4. The portable intelligent low-disturbance sampling device according to claim 1, characterized in that: The sampling pipe includes a polytetrafluoroethylene water pipe, a steel wire rope, and a cable wrapped around the polytetrafluoroethylene water pipe with polytetrafluoroethylene tape. The sampling pipe is controlled by a winch for retraction and extension.

5. The portable intelligent low-disturbance sampling device according to claim 1, characterized in that: The variable-frequency controller is used to adjust the water pump flow rate, realize large-flow well flushing and low-flow sampling, reduce the sampling auxiliary time, and reduce the disturbance to the water sample.

6. The portable intelligent low-disturbance sampling device according to claim 1, wherein: The indicators that the water quality detection probe can detect are pH value, temperature, conductivity, oxidation-reduction potential, dissolved oxygen, and turbidity.

7. The portable intelligent low-disturbance sampling device according to claim 1, characterized in that: The automatic controller includes a water pump control switch, a frequency converter frequency modulation unit, a monitoring probe power supply unit, a liquid crystal display screen, a solenoid valve control unit, a storage system, an alarm unit, and a Bluetooth module. Among them, the water pump control switch is used to control the start and stop of the sampling pump; the frequency converter frequency modulation unit uses an RS485 serial port to adjust the frequency of the frequency conversion controller to control the flow rate of the sampling pump; the monitoring probe power supply unit includes two power supply units for supplying power to the water level and water temperature monitoring probe and the water quality detection probe; the water level and water temperature monitoring probe uses 4 wires with a voltage of 9V, and the water quality detection probe uses 4 wires with a voltage of 12V, both using RS485 serial ports; the solenoid valve control unit has a power supply voltage of 12V and is used to control the start and stop of the solenoid valve; the storage system is used to store the water quality detection data during the sampling process; the alarm unit is used to prompt the operator of the sampling process, and the Bluetooth module can use RS485 / 232 serial port communication to transmit the sampling and water quality detection data to the mobile phone APP for remote viewing; the liquid crystal display screen is used to display parameters such as pH value, temperature, conductivity, oxidation-reduction potential, dissolved oxygen, and turbidity.

Images