An automatic groundwater monitoring sampling device

Abstract

The application discloses a kind of underground water monitoring automatic sampling device, belongs to underground water sampling technical field.A kind of underground water monitoring automatic sampling device, including portable power supply, control module, submersible pump, receiving tank and monitoring device;Control module is electrically connected with submersible pump, portable power supply and monitoring device by cable respectively;Receiving tank is communicated with submersible pump by water pipe, for collecting and storing water sample, monitoring device is used to monitor the parameter of underground water sample, control module is used to control the start-stop of submersible pump and sampling time and receive the underground water sample parameter monitored by monitoring device;Submersible pump includes pump body, waterproof motor and impurity removal device;Waterproof motor is detachably connected with the lower part of pump body, and the pump body is driven by waterproof motor to run and extract water sample;Impurity removal device is arranged between waterproof motor and pump body, can filter the impurities in underground water entering pump body simultaneously during sampling process, prevent dirt adhesion, prolong the service life of device.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of groundwater sampling, and more particularly relates to an automatic groundwater monitoring sampling device. BACKGROUND

[0002] Groundwater monitoring and sampling is an important link in environmental assessment, pollution control and hydrogeological research. Groundwater quality monitoring usually collects instantaneous water samples. For wells with water level to be measured, the groundwater level should be measured before sampling, and sampling should be performed after sufficient pumping to ensure that the water sample represents the groundwater quality. Traditional groundwater sampling devices usually extract water samples through submersible pumps and record the parameters of groundwater through synchronous monitoring of water quality parameters.

[0003] Existing groundwater sampling devices usually automatically and multidimensionally monitor groundwater through data storage and control modules, data transmission and connection modules, and measurement unit modules. However, when the existing water quality monitoring and sampling device monitors water quality, some dirt adheres to the inside of the submersible pump, which not only affects the detection results during subsequent groundwater sampling and monitoring, but also causes dirt deposition and shortens the service life of the device. For example, a groundwater quality monitoring and sampling device convenient for cleaning dirt and a use method thereof (CN202410639096.X) disclosed in Chinese patent documents, which uses the power generated during the movement of the hull to the next position for cleaning the last sampling cylinder, to ensure that the inner wall of the sampling cylinder does not adhere to dirt. However, the application is limited to boat travel, and the dirt inside the submersible pump cannot be removed when there is no boat travel to provide power.

[0004] Therefore, we need to provide a groundwater sampling device that is widely applicable and can effectively remove dirt from the submersible pump in a timely manner. SUMMARY

[0005] The purpose of the present application is to provide an automatic groundwater monitoring sampling device with high monitoring accuracy and wide application range, which can remove dirt during groundwater sampling through the setting of a dirt removal device, ensure the cleanliness of the inside of the submersible pump, and improve the accuracy of water quality monitoring.

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

[0007] The groundwater monitoring automatic sampling device of the present application comprises a mobile power supply, a control module, a submersible pump, a receiving tank, a monitoring device and a cable; the control module is electrically connected with the submersible pump, the mobile power supply and the monitoring device through the cable; the submersible pump is communicated with the receiving tank through a water pipe for pumping groundwater samples; the receiving tank is used for collecting and storing water samples; the monitoring device is used for monitoring the parameters of the groundwater samples; the control module is used for controlling the start and stop of the submersible pump, the sampling time and the parameters of the groundwater samples monitored by the monitoring device; the control module can set the sampling time and frequency to ensure the continuity and accuracy of water sample collection.

[0008] The submersible pump comprises a pump body, a waterproof motor and a impurity removal device; the waterproof motor is detachably connected with the lower part of the pump body and drives the pump body to operate to pump water samples; the impurity removal device is arranged between the waterproof motor and the pump body and can filter the impurities in the groundwater entering the pump body during the sampling process, prevent dirt adhesion and prolong the service life of the device.

[0009] As a further improvement of the present application, the control module comprises a box body and a power supply interface, a water level drawdown instrument interface, a flowmeter interface, a water quality detector interface, a display screen, a speed regulating knob and a submersible pump interface installed in the box body; the control module receives the monitoring data of the monitoring device through the water level drawdown instrument interface, the flowmeter interface and the water quality detector interface; the display screen is used for real-time display of the monitoring data and the working state of the submersible pump; the speed regulating knob is used for adjusting the pumping speed of the submersible pump; the submersible pump interface is electrically connected with the submersible pump and is used for transmitting the instructions of the control module for controlling the operation of the submersible pump.

[0010] As a further improvement of the present application, the pump body comprises a pump shell, a multi-stage impeller, a connecting frame, a mounting side pipe and a top cover; the multi-stage impeller is installed in the pump shell and detachably connected with the waterproof motor and generates centrifugal force through high-speed rotation to push the liquid flow, thereby pumping groundwater samples; the connecting frame is detachably installed at the bottom of the pump shell and is used for fixing the waterproof motor and the impurity removal device; the mounting side pipe is fixedly installed at the side of the pump shell and is used for accommodating the cable between the waterproof motor and the control module, avoiding cable winding and ensuring that the cable is not damaged during operation; the top cover is detachably connected with the top of the pump shell and is provided with a water outlet and a cable outlet above the top cover; the water outlet is used for conveying the pumped groundwater samples to the receiving tank and the monitoring device through the water pipe; the cable outlet is used for leading out the cable and connecting the control module.

[0011] As a further improvement of the present application, the mounting side pipe penetrates into the pump body through a top arc-shaped pipe, effectively preventing cable abrasion; a through hole is formed in the middle of the mounting side pipe and is used for connecting the impurity removal device; the position of the through hole is consistent with that of the impurity removal device, which is used for reducing the exposure of the cable in water and reducing the risk of short circuit.

[0012] As a further improvement of the application, the impurity removal device comprises a filter screen, a scraper, a differential pressure sensor, an air cylinder and a push plate; the filter screen is semicircular in profile and detachably installed at the bottom of the pump body, and the outer surface of the filter screen is attached to the scraper; the scraper is detachably connected to the waterproof motor, and comprises a connecting ring detachably connected to the output shaft of the waterproof motor and a plurality of plate surfaces evenly distributed in the circumferential direction, the upper part of the plate surface being rotatably connected to the filter screen; the differential pressure sensor is arranged on the inner and outer sides of the filter screen to detect the differential pressure change between the inner and outer sides of the filter screen caused by the blockage of the filter screen by dirt; the differential pressure sensor and the air cylinder are electrically connected to the control module through a cable, and the control module is used to control the start of the air cylinder when the differential pressure between the inner and outer sides of the filter screen increases; the push plate is located at the lower part of the filter screen and is slidably connected to the output shaft of the waterproof motor, and the air cylinder is detachably connected to the push plate, which is used to push the push plate to drive the water flow to remove the dirt attached to the surface of the filter screen, thereby ensuring the filtering effect and prolonging the stable operation period of the device.

[0013] As a further improvement of the application, the width of the plate surface of the scraper decreases from top to bottom, so that the two sides of the plate surface form inclined flow guiding planes for guiding the scraped dirt away from the filter screen to avoid secondary attachment of the dirt.

[0014] As a further improvement of the application, the monitoring device comprises a water quality detector, a flow meter and a water level drawdown instrument, one end of the water quality detector is electrically connected to the water quality detector interface, the other end is connected to the receiving tank through a water pipe, and is used to detect the turbidity, temperature, pH, oxidation-reduction potential, dissolved oxygen and conductivity of the extracted groundwater sample; the flow meter is electrically connected to the flow meter interface, and is used to record the instantaneous flow and cumulative flow of the submersible pump; the water level drawdown instrument is electrically connected to the water level drawdown instrument interface, and is used to measure the real-time data of the static water level, well depth and water level change. When the water level drops by 10 cm, the system automatically alarms and stops sampling, and after the water level recovers, the sampling process is automatically restarted.

[0015] As a further improvement of the application, the control module is adjusted by the feedback of the monitoring device, and the sampling is automatically ended when the pumping volume calculated by the flow meter reaches 3-5 times the well volume or the change of 3 of the 6 parameters detected by the water quality detector is determined to be stable for three consecutive times.

[0016] As a further improvement of the application, the six parameter intervals detected by the water quality detector include turbidity < 10 NTU or turbidity change within ± 10%, conductivity change within ± 10%, pH change within ± 0.1, temperature within ± 0.5℃, oxidation-reduction potential change within ± 10mV or within ± 10%, and dissolved oxygen change within ± 0.3mg / L or within ± 10%, and the reliability of automatic control is improved by joint determination of multiple parameters.

[0017] Compared to existing technologies, the advantages of this invention are as follows: The automatic groundwater sampling device of this invention uses a control module electrically connected to both a submersible pump and a monitoring device to control the start / stop of the submersible pump, the sampling time, and to receive groundwater sample parameters monitored by the monitoring device. This achieves centralized processing of monitoring data and control commands, allowing operators to simultaneously monitor parameters, display status, and adjust operation through a single control module. By installing a removal device at the submersible pump to filter impurities from the groundwater entering the pump body, damage to the pump body is prevented, and the device can effectively and promptly remove scale from the submersible pump, thus extending its service life. Furthermore, by using a scraper with a gradually decreasing width from top to bottom that adheres to the filter screen to remove scale from its surface, the cleaning efficiency is improved, and the obliquely oriented planes on both sides of the scraper can effectively remove scale. The system directs water away from the filter screen to prevent secondary adhesion of dirt. A differential pressure sensor detects excessive pressure difference between the inside and outside of the filter screen and, in conjunction with a cylinder and push plate, instantly reverses the water flow to flush the filter screen, achieving automatic dirt removal. This prevents dirt buildup from affecting test results and the device's lifespan, ensuring the accuracy of monitoring data and the long-term stability of the device. The system uses the pumping volume collected by the monitoring device and six parameters detected by the water quality analyzer to provide feedback to the control module, solving the problem of accurately determining the termination time during groundwater sampling. This ensures that the collected samples accurately reflect the true water quality state. Furthermore, the system automatically stops operating when the residual water in the well is fully replaced or the water quality parameters stabilize, avoiding energy consumption caused by excessive pumping and eliminating random errors introduced by manual operation, thus improving the reliability of the monitoring data. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an automatic groundwater monitoring sampling device according to the present invention;

[0019] Figure 2 This is a schematic diagram of the submersible pump structure of an automatic groundwater monitoring sampling device according to the present invention;

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of a submersible pump in an automatic groundwater monitoring sampling device according to the present invention;

[0021] Figure 4 This is a schematic diagram of the impurity removal device structure of an automatic groundwater monitoring sampling device according to the present invention.

[0022] Figure 5 This is a schematic diagram of the impurity removal device A of an automatic groundwater monitoring sampling device according to the present invention.

[0023] Figure 6 This is a schematic diagram of the control module structure of an automatic groundwater monitoring and sampling device according to the present invention.

[0024] Explanation of the labels in the diagram:

[0025] 1mobile power supply, 2control module, 21box, 22power supply interface, 23water level drawdown instrument interface, 24flow meter interface, 25water quality detector interface, 26display screen, 27speed knob, 28submersible pump interface, 3submersible pump, 31pump body, 311pump shell, 312multistage impeller, 313connecting frame, 314mounting side pipe, 3141through hole, 315top cover, 316water outlet, 317cable port, 32waterproof motor, 33impurity removal device, 331filter screen, 332scraper, 3321connecting ring, 3322plate surface, 333differential pressure sensor, 334cylinder, 335pushing plate, 4receiving tank, 5monitoring device, 51water quality detector, 52flow meter, 53water level drawdown instrument, 6cable, 7water pipe. DETAILED DESCRIPTION

[0026] Specific embodiment one: please refer to Figures 1-6 An underground water monitoring automatic sampling device, comprising a mobile power supply 1, a control module 2, a submersible pump 3, a receiving tank 4, a monitoring device 5 and a cable 6; the control module 2 is electrically connected with the submersible pump 3, the mobile power supply 1 and the monitoring device 5 through the cable 6; the submersible pump 3 is communicated with the receiving tank 4 through a water pipe 7, for extracting underground water sample; the receiving tank 4 is used for collecting and storing water sample, the monitoring device 5 is used for monitoring parameters of underground water sample, and the control module 2 is used for controlling start-stop and sampling time of the submersible pump 3 and receiving underground water sample parameters monitored by the monitoring device 5; the control module 2 can set sampling time and frequency, to ensure continuity and accuracy of water sample collection.

[0027] As Figure 2 shown, the submersible pump 3 comprises a pump body 31, a waterproof motor 32 and an impurity removal device 33; the waterproof motor 32 is detachably connected with the lower part of the pump body 31, and the waterproof motor 32 drives the pump body 31 to run to extract water sample; the impurity removal device 33 is arranged between the waterproof motor 32 and the pump body 31, can filter impurities in underground water entering the pump body 31 in the sampling process, prevent dirt adhesion, and prolong service life of the device.

[0028] Specifically, as Figure 5 shown, the control module 2 comprises a box 21 and a power supply interface 22, a water level drawdown instrument interface 23, a flow meter interface 24, a water quality detector interface 25, a display screen 26, a speed knob 27 and a submersible pump interface 28 installed in the box 21; the control module 2 receives monitoring data of the monitoring device 5 through the water level drawdown instrument interface 23, the flow meter interface 24 and the water quality detector interface 25 respectively, the display screen 26 is used for real-time display of monitoring data and working state of the submersible pump 3, and the speed knob 27 is used for adjusting water pumping speed of the submersible pump 3; the submersible pump interface 28 is electrically connected with the submersible pump 3, and is used for transmitting instructions of the control module 2 for controlling the submersible pump 3 to run.

[0029] Specifically, as shown in Figure 3 The pump body 31 includes a pump shell 311, a multi-stage impeller 312, a connecting frame 313, a mounting side pipe 314, and a top cover 315; the multi-stage impeller 312 is installed inside the pump shell 311 and detachably connected with the waterproof motor 32; the multi-stage impeller 312 is a booster unit composed of a plurality of serially connected centrifugal impellers, which generates centrifugal force through high-speed rotation to push the liquid to flow, thereby efficiently pumping the underground water sample; the connecting frame 313 is detachably installed at the bottom of the pump shell 311 and used for fixing the waterproof motor 32 and the impurity removal device 33; the mounting side pipe 314 is fixedly installed at the side of the pump shell 311 and used for accommodating the cable 6 between the waterproof motor 32 and the control module 2, the internal passage of which provides physical protection for the cable 6 to avoid damage or entanglement of the cable 6 in water flow scouring or mechanical vibration, and to ensure that the cable 6 is not damaged in operation; the top cover 315 is detachably connected with the top of the pump shell 311, and a water outlet 316 and a cable port 317 are arranged above the top cover 315, the water outlet 316 is used for conveying the pumped underground water sample to the receiving tank 4 and the monitoring device 5 through the water pipe 7, and the cable port 317 is used for leading out the cable 6 and connecting the control module 2; the water outlet 316 and the cable port 317 are respectively provided with independent passages to realize physical isolation of water sample conveying and power control.

[0030] Specifically, as shown in Figure 4 The mounting side pipe 314 penetrates into the inside of the pump body 31 through the top arc-shaped pipe, effectively preventing the cable 6 from being abraded; the mounting side pipe 314 is provided with a through hole 3141 in the middle, which is used for connecting the impurity removal device 33; the through hole 3141 is located at the same position as the impurity removal device 33, which is used for reducing the exposure of the cable 6 in water and reducing the risk of short circuit.

[0031] Specifically, as shown in Figure 5The shown impurity removal device 33 includes a filter screen 331, a scraper 332, a differential pressure sensor 333, an air cylinder 334, and a push plate 335; the filter screen 331 is semicircular in profile and detachably installed at the bottom of the pump body 31, and the outer screen surface of the filter screen 331 is in contact with the scraper 332; the scraper 332 is detachably connected with the waterproof motor 32, and includes a connecting ring 3321 detachably connected with the output shaft of the waterproof motor 32 and a plurality of plate surfaces 3322 evenly distributed in the circumferential direction, and the upper part of each plate surface 3322 is rotatably connected with the filter screen 331; the differential pressure sensor 333 is arranged on both the inner and outer sides of the filter screen 331 and is used to detect the differential pressure change between the inner and outer sides of the filter screen 331 caused by the dirt blocking the filter screen 331; the differential pressure sensor 333 and the air cylinder 334 are electrically connected with the control module 2 through the cable 6, and the air cylinder 334 is controlled to be started after the differential pressure between the inner and outer sides of the filter screen 331 increases through the control module 2; the push plate 335 is located at the lower part of the filter screen 331 and is slidably connected with the output shaft of the waterproof motor 32, and the air cylinder 334 is detachably connected with the push plate 335 and is used to push the push plate 335 to drive the water flow to remove the dirt attached to the surface of the filter screen 331, so as to ensure the filtering effect and prolong the stable operation period of the device; when the submersible pump 3 is operated, the underground water enters the pump body 31 through the filter screen 331 of the impurity removal device 33, and the impurities are intercepted on the outer side of the filter screen 331; the waterproof motor 32 drives the scraper 332 to rotate, and the edges of the plate surfaces 3322 are in contact with the outer surface of the filter screen 331 and scrape off the attached dirt; when the differential pressure between the inner and outer sides of the filter screen 331 caused by the blockage of the filter screen 331 exceeds the set value, the differential pressure sensor 333 transmits a signal to the control module 2, triggering the air cylinder 334 to push the push plate 335 to slide along the output shaft of the waterproof motor 32, and the displacement of the push plate 335 causes the water flow to instantaneously reverse and flush the filter screen 331, so as to flush the scraped dirt away from the surface of the filter screen 331; after the cleaning is completed, the differential pressure sensor 333 detects that the differential pressure returns to normal, and the air cylinder 334 is reset to wait for the next triggering; thus, the real-time dirt removal during the operation of the submersible pump 3 is realized, the accumulation of impurities is avoided to affect the water quality detection accuracy, the frequency of manual maintenance is reduced through the mechanical linkage cleaning mechanism, and the continuous working time of the equipment in the complex water quality environment is prolonged.

[0032] Specifically, the plate surfaces 3322 of the scraper 332 decrease in width from top to bottom, so that the two sides of the plate surfaces 3322 form inclined flow guiding planes, the fluid shear force generated by the width change of the plate surfaces 3322 can accelerate the dirt to separate, the directional flow formed by the inclined surface structure ensures that the dirt is effectively taken away from the filter screen area, avoids the secondary attachment of the dirt, reduces the risk of blockage of the filter screen 331, prolongs the continuous working time of the equipment, and guarantees the accuracy of the underground water monitoring data.

[0033] Specifically, as shown in FIG. 6, the filter screen 331 is provided with a plurality of inclined flow guiding planes 3311, and the plate surfaces 3322 of the scraper 332 are in contact with the inclined flow guiding planes 3311. Figure 6The monitoring device 5 shown includes a water quality detector 51, a flow meter 52 and a water level drawdown detector 53. The water quality detector 51 is electrically connected to the water quality detector interface 25 at one end and connected to the receiving tank 4 through the water pipe 7 at the other end, for detecting the turbidity, temperature, pH, oxidation-reduction potential, dissolved oxygen and conductivity of the extracted groundwater sample. The flow meter 52 is electrically connected to the flow meter interface 24, for recording the instantaneous flow rate and cumulative flow rate of the submersible pump 3. The water level drawdown detector 53 is electrically connected to the water level drawdown detector interface 23, for measuring the real-time data of the static water level, well depth and water level change. When the water level drops by 10 cm, the system automatically alarms and stops sampling. After the water level recovers, the sampling process is automatically restarted.

[0034] Specifically, the control module 2 is adjusted by the feedback of the monitoring device 5. The sampling is automatically ended when the water pumping volume calculated by the flow meter 52 reaches 3-5 times the well volume or the change of three of the six parameters detected by the water quality detector 51 is measured three times in succession and reaches the stable interval. Thus, the problem of difficult accurate judgment of the termination time during the groundwater sampling process is solved, and the collected sample can accurately reflect the real water quality state. At the same time, when the residual water in the well is fully replaced or the water quality parameters tend to be stable, the system automatically stops running, which not only avoids the energy loss caused by excessive pumping, but also eliminates the random errors introduced by manual operation, and improves the reliability of the monitoring data.

[0035] Specifically, the six parameter intervals detected by the water quality detector 51 include turbidity <10 NTU or turbidity change within ±10%, conductivity change within ±10%, pH change within ±0.1, temperature within ±0.5℃, oxidation-reduction potential change within ±10 mV or within ±10%, and dissolved oxygen change within ±0.3 mg / L or within ±10%. The reliability of automatic control is improved by joint determination of multiple parameters.

[0036] In use, the elements are connected by cable 6 and water pipe 7, the submersible pump 3 is placed in the well to start work, the water quality detector 51, flow meter 52 and water level drawdown instrument 53 monitor data in real time, and the control module 2 automatically adjusts the sampling speed according to the preset parameters; when the submersible pump 3 is running, the groundwater enters the pump body 31 through the filter screen 331 of the impurity removal device 33, the impurities are intercepted outside the filter screen 331, the waterproof motor 32 drives the scraper 33 to rotate synchronously with the multi-stage impeller 312, the plate surface 3322 edge contacts the outer surface of the filter screen 331 and scrapes off the attached dirt; when the filter screen 331 is blocked and the internal and external pressure difference exceeds the set value, the pressure difference sensor 333 transmits the signal to the control module 2, triggers the air cylinder 334 to push the push plate 335 to slide along the waterproof motor 32 output shaft, the displacement of the push plate 335 causes the water flow to be temporarily flushed in the opposite direction to flush the dirt scraped off from the surface of the filter screen 331, after cleaning, the pressure difference sensor 333 detects that the pressure difference returns to normal, the air cylinder 334 resets and waits for the next trigger; so as to realize real-time dirt removal during the working process of the submersible pump 3; when the flow meter 52 calculates the pumping volume to be 3-5 times the well volume or the changes of three of the six parameters detected by the water quality detector 51 are measured continuously for three times and reach the stable interval, the sampling is automatically ended, ensuring the accuracy and efficiency of the sampling process.

[0037] The above is only a preferred embodiment of the present application and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An automatic groundwater sampling device, characterized in that: The system includes a power bank (1), a control module (2), a submersible pump (3), a receiving tank (4), a monitoring device (5), and a cable (6). The control module (2) is electrically connected to the submersible pump (3), the power bank (1), and the monitoring device (5) via the cable (6). The submersible pump (3) is connected to the receiving tank (4) via a water pipe (7) and is used to extract groundwater samples. The receiving tank (4) is used to collect and store water samples. The monitoring device (5) is used to monitor the parameters of the groundwater samples. The control module (2) is used to control the start and stop of the submersible pump (3) and the sampling time, as well as to receive the groundwater sample parameters monitored by the monitoring device (5). The submersible pump (3) includes a pump body (31), a waterproof motor (32), and a cleaning device (33); the waterproof motor (32) is detachably connected to the lower part of the pump body (31), and the waterproof motor (32) drives the pump body (31) to run and extract water samples; the cleaning device (33) is set between the waterproof motor (32) and the pump body (31) and is used to filter impurities in the groundwater entering the pump body (31); The impurity removal device (33) includes a filter screen (331), a scraper (332), a differential pressure sensor (333), a cylinder (334), and a pusher plate (335); the filter screen (331) has a semi-circular outline and is detachably installed at the bottom of the pump body (31), with the outer mesh surface of the filter screen (331) in contact with the scraper (332); the scraper (332) is detachably connected to the waterproof motor (32), and the scraper (332) includes a connecting ring (3321) detachably connected to the output shaft of the waterproof motor (32) and several evenly circumferentially distributed plate surfaces (3322), the upper part of which is rotatably connected to the filter screen (331); differential pressure sensor (333) Sensor (333) is installed on both the inside and outside of the filter screen (331) to detect the pressure difference generated inside and outside the filter screen (331); the pressure difference sensor (333) and the cylinder (334) are electrically connected to the control module (2) through the cable (6). The control module (2) controls the start of the cylinder (334) after the pressure difference inside and outside the filter screen (331) increases; the push plate (335) is located at the lower part of the filter screen (331) and is slidably connected to the output shaft of the waterproof motor (32). The cylinder (334) is detachably connected to the push plate (335) to push the push plate (335) to drive the water flow to remove the dirt attached to the surface of the filter screen (331); The width of the scraper (3322) decreases from top to bottom, so that the two sides of the scraper (3322) form a plane with oblique flow guidance, which is used to guide the scraped dirt away from the filter screen (331).

2. The automatic groundwater sampling device according to claim 1, characterized in that: The control module (2) includes a housing (21) and a power interface (22), a water level discharge instrument interface (23), a flow meter interface (24), a water quality tester interface (25), a display screen (26), a speed control knob (27), and a submersible pump interface (28) installed inside the housing (21). The control module (2) receives monitoring data from the monitoring device (5) through the water level discharge instrument (23) interface, the flow meter interface (24), and the water quality tester interface (25), respectively. The display screen (26) is used to display the monitoring data and the working status of the submersible pump (3) in real time. The speed control knob (27) is used to adjust the pumping speed of the submersible pump (3). The submersible pump interface (28) is electrically connected to the submersible pump (3) and is used to transmit the control module (2)'s instructions to control the operation of the submersible pump (3).

3. The automatic groundwater sampling device according to claim 1, characterized in that: The pump body (31) includes a pump casing (311), a multi-stage impeller (312), a connecting frame (313), a mounting side pipe (314), and a top cover (315); the multi-stage impeller (312) is installed inside the pump casing (311) and is detachably connected to a waterproof motor (32) for extracting groundwater samples; The connecting bracket (313) is detachably installed at the bottom of the pump casing (311) to fix the waterproof motor (32) and the impurity removal device (33); the mounting side pipe (314) is fixedly installed on the side of the pump casing (311) to accommodate the cable (6) between the waterproof motor (32) and the control module (2); the top cover (315) is detachably connected to the top of the pump casing (311), and the top cover (315) is provided with an outlet (316) and a cable port (317). The outlet (316) is used to transport the extracted groundwater sample through the water pipe (7) to the receiving tank (4) and the monitoring device (5); the cable port (317) is used to lead out the cable (6) and connect it to the control module (2).

4. The automatic groundwater sampling device according to claim 3, characterized in that: The mounting side pipe (314) extends into the pump body (31) through the top arc-shaped pipe. A through hole is opened in the middle of the mounting side pipe (314) for connecting the impurity removal device (33).

5. The automatic groundwater sampling device according to claim 2, characterized in that: The monitoring device (5) includes a water quality analyzer (51), a flow meter (52), and a water level drain meter (53). One end of the water quality analyzer (51) is electrically connected to the water quality analyzer interface (25), and the other end is connected to the receiving tank (4) through a water pipe (7). It is used to detect the turbidity, temperature, pH, oxidation-reduction potential, dissolved oxygen, and conductivity of the extracted groundwater sample. The flow meter (52) is electrically connected to the flow meter interface (24) and is used to record the instantaneous flow rate and cumulative flow rate of the submersible pump (3). The water level drain meter (53) is electrically connected to the water level drain meter interface (23) and is used to determine the static water level, well depth, and water level changes.

6. The automatic groundwater sampling device according to claim 5, characterized in that: The control module (2) is adjusted by the feedback from the monitoring device (5). When the pumping volume reaches 3-5 times the well volume of water calculated by the flow meter (52) or when the change of 3 out of 6 parameters detected by the water quality tester (51) reaches the stable range after three consecutive measurements, the sampling will automatically end.

7. The automatic groundwater sampling device according to claim 6, characterized in that: The water quality analyzer (51) detects six parameter ranges, including turbidity <10 NTU or turbidity change within ±10%, conductivity change within ±10%, pH change within ±0.1%, temperature within ±0.5℃, oxidation-reduction potential change within ±10mV or +10%, and dissolved oxygen change within ±0.3mg / L or +10%.

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