A sampling device for groundwater exploration and a sampling method thereof

Abstract

The application discloses a sampling device for groundwater detection and a sampling method thereof, and belongs to the technical field of groundwater detection, comprising a sleeve, a first water inlet is arranged on the side wall of the sleeve, and an electromagnetic valve is arranged at the first water inlet; a plurality of sampling chambers are uniformly distributed along the circumferential direction of the sleeve and are rotatably arranged in the sleeve through a rotating plate, and a sampling port is arranged on each sampling chamber; wherein the rotating plate can rotate to selectively make the sampling port of one of the sampling chambers correspondingly communicate with the first water inlet on the sleeve; a rotating mechanism is arranged in the sleeve, the output end of the rotating mechanism is in communication with the rotating plate, and the rotating mechanism is used for driving the rotating plate to rotate to switch different sampling chambers so that the sampling ports of the sampling chambers correspondingly communicate with the first water inlet. The application effectively solves the technical problems of low efficiency and inability to accurately preserve deep sampling technology in the traditional groundwater sampling method.

Description

Technical Field

[0001] This invention belongs to the field of groundwater detection technology, specifically relating to a sampling device and sampling method for groundwater detection. Background Technology

[0002] In fields such as environmental monitoring, hydrogeological surveys, and pollution assessment, accurate and pollution-free sampling and analysis of groundwater at specific depths is crucial. Traditional groundwater sampling methods often employ single-chamber samplers, which can only obtain water samples from one depth point per well run. To obtain water samples from different depths, the equipment must be repeatedly pulled up and lowered, which is cumbersome, inefficient, and prone to disturbing the aquifer, affecting the representativeness of water quality at subsequent sampling points.

[0003] Existing improved sampling devices attempt to acquire multiple water samples simultaneously, but most employ parallel multi-tube or sequentially opening / closing structures, resulting in bulky devices with poor adaptability to well placement. More importantly, during the sampler's lowering process, the sampling chamber in existing devices typically has a pressure difference or connection with the outside environment, allowing water, air, or impurities from depths other than the target depth to prematurely enter the chamber. This prevents true "fixed-depth" sampling, and the obtained samples cannot accurately reflect the groundwater quality at the target depth. Furthermore, the sampling process lacks automation and intelligence, with depth control relying on manual judgment, limiting accuracy and reliability.

[0004] Therefore, there is an urgent need for a groundwater detection and sampling device and method that can efficiently and accurately acquire multiple groundwater samples at different depths, effectively prevent sample contamination during the descent process, and ensure the purity of the samples. Summary of the Invention

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A sampling device for groundwater detection, comprising: A sleeve, wherein a first water inlet is provided on the side wall of the sleeve, and a solenoid valve is provided at the first water inlet; Multiple sampling chambers are evenly distributed along the circumference of the sleeve and rotatably disposed inside the sleeve via a rotating plate. Each sampling chamber is provided with a sampling port. The rotating plate is rotatable to selectively connect the sampling port of one of the sampling chambers with the first water inlet on the sleeve. A rotating mechanism is disposed inside the sleeve. The output end of the rotating mechanism is connected to the rotating plate and is used to drive the rotating plate to rotate, so as to switch different sampling chambers so that their sampling ports are connected to the first water inlet. A control module is connected to the solenoid valve and the rotating mechanism respectively, and is used to control the start and stop of the rotating mechanism and the opening and closing of the solenoid valve.

[0006] Furthermore, it also includes an air pump, air valves, and an number of airbags equal to the number of sampling chambers; The output end of the air pump is connected to one end of the air valve through the first air guide pipe, and the other end of the air valve is connected to the second air guide pipe provided on the top of the sleeve through the retractable air guide pipe. The second air guide tube extends into the sleeve and is connected to one end of the third air guide tube disposed inside the sleeve via a rotary joint; The airbag is installed in the sampling chamber and is installed in a one-to-one correspondence with the sampling chamber; the other end of the third air guide tube is connected to multiple branch tubes, each of which is connected to an airbag in the sampling chamber, and each branch tube is equipped with an air inlet valve. The control module is also electrically connected to the air pump, the air valve, and each of the air intake valves, for controlling the inflation of the designated airbag.

[0007] Furthermore, both the second and third air guide tubes are located on the same axis as the sleeve.

[0008] Furthermore, the rotating mechanism includes a first gear, a second gear, and a first motor; The first motor is disposed in the sampling chamber, and the output shaft of the first motor is connected to the first gear; The second gear is fixedly mounted on the outer surface of the third air guide tube and meshes with the first gear; The first motor is connected to the control module and is used to control the first motor to drive the first gear to rotate, thereby causing the second gear and the third air pipe to rotate, which in turn drives the rotating plate to rotate.

[0009] Furthermore, a depth sensor for detecting the depth of the device is also provided at the first water inlet, and the depth sensor is connected to the control module.

[0010] Furthermore, the control module has a preset sampling program that can automatically control the rotating mechanism to switch the sampling chamber according to a preset depth signal, and control the solenoid valve, the air pump, the air valve and the corresponding air inlet valve to open for sampling.

[0011] Furthermore, it also includes a rope winder, the output end of which is connected to the sleeve via a rope. The rope winder is connected to the control module, and the control module controls the raising / lowering of the sleeve by controlling the length of the rope winder's rope.

[0012] Furthermore, a filter screen is also provided at the sampling port.

[0013] Furthermore, gravity blocks for traction by ropes are provided on both sides of the sleeve.

[0014] A sampling method for groundwater detection, using the sampling device described above, the sampling method comprising the following steps: S1. Lower the sampling device to the target sampling depth of groundwater; S2. The control module controls the rotation mechanism to start, drives the rotating plate to rotate, so that the sampling port of a designated sampling chamber is connected to the first water inlet on the sleeve. S3. The control module controls the opening of the air inlet valve corresponding to the designated sampling chamber, and controls the air pump and the air valve to start, inflating the airbag in the sampling chamber through the third air guide pipe and the branch pipe until the airbag expands so that the pressure in the sampling chamber is balanced with the external water pressure. S4. Under pressure balance, the control module controls the solenoid valve at the first water inlet to open, so that groundwater enters the sampling chamber through the first water inlet and the corresponding sampling port to complete the fixed-depth water sample collection. S5. After sampling is completed, the control module controls the solenoid valve to close and controls the airbag to deflate and contract. S6. Repeat the above steps and switch between different sampling chambers by rotating the mechanism to achieve multiple groundwater samplings at different depths or locations.

[0015] Beneficial effects: 1. Achieve efficient, multi-depth stratified sampling: By setting up multiple independent sampling chambers evenly distributed along the circumference and controlled by a rotating plate, and in conjunction with the rotating mechanism, different chambers can be switched and activated sequentially at different depths according to a preset program or command during a single well run. This avoids the cumbersome operation of repeatedly raising and lowering the equipment required by traditional methods, greatly improves sampling efficiency, and reduces the impact of operational disturbances on the aquifer.

[0016] 2. Ensuring the accuracy and purity of fixed-depth sampling: An airbag is installed in each sampling chamber, and before sampling, the airbag in the target chamber is inflated by an air pump to balance the gas pressure inside the chamber with the external water pressure at the current depth. This crucial step ensures that the pressure inside and outside the chamber is essentially the same at the moment the inlet solenoid valve is opened, effectively preventing the passive influx of water or impurities from non-target depths during the device's descent. Only when the solenoid valve is actively opened at the target depth can the water sample at the corresponding depth flow in under pressure equilibrium, thus truly achieving "fixed-depth, high-fidelity" sampling with extremely high sample representativeness.

[0017] 3. Enhanced Automation and Intelligence: The device integrates a control module, depth sensor, motor-driven solenoid valve, and air circuit valves, allowing for preset sampling depth programs. It can automatically sense depth, automatically switch sampling chambers, and automatically complete airbag pressure balancing and sampling operations. The fully automated operation reduces human error, improves sampling accuracy and reliability, and enables remote control.

[0018] 4. Compact structure and good adaptability: Multiple sampling chambers are evenly arranged along the circumference of the sleeve, making full use of the radial space. This ensures that the device maintains the capacity of multiple chambers while maintaining a compact overall structure and small diameter, making it easy to place in a standard monitoring well. The rotary joint design ensures stable gas supply to the central gas guide tube when the rotating plate is switched.

[0019] 5. Enhanced practicality through auxiliary functions: The linkage between the depth sensor and the rope reel enables precise control of the descent depth; the filter screen prevents large particles from entering the sampling chamber, protecting the internal pipelines and airbags; the gravity blocks on both sides help the device maintain a stable vertical posture during descent, ensuring the accuracy of depth measurement. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the sleeve of the present invention; Figure 2 This is a schematic diagram of the internal structure of the sleeve of the present invention; Figure 3 This is a schematic diagram of the structure of the present invention; Explanation of reference numerals in the attached drawings: 1. Sleeve; 2. Sampling chamber; 3. First water inlet; 4. Second air guide tube; 5. Third air guide tube; 6. Second gear; 7. First gear; 8. Airbag; 9. Sampling port; 10. Air pump; 11. Rope winder; 12. Gravity block. Detailed Implementation

[0021] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0022] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0023] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0024] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0025] Example 1

[0026] refer to Figure 1-3 A sampling device for groundwater detection, comprising: Sleeve 1, a first water inlet 3 is provided on the side wall of sleeve 1, and a solenoid valve is provided at the first water inlet 3; Multiple sampling chambers 2 are evenly distributed along the circumference of the sleeve 1 and are rotatably disposed inside the sleeve 1 via a rotating plate. Each sampling chamber 2 is provided with a sampling port 9. The rotating plate can rotate to selectively connect the sampling port 9 of one of the sampling chambers 2 with the first water inlet 3 on the sleeve 1. A rotating mechanism is installed inside the sleeve 1. The output end of the rotating mechanism is connected to the rotating plate and is used to drive the rotating plate to rotate so as to switch different sampling chambers so that the sampling port 9 is connected to the first water inlet 3. The control module is connected to the solenoid valve and the rotating mechanism respectively, and is used to control the start and stop of the rotating mechanism and the opening and closing of the solenoid valve.

[0027] Preferably, it also includes an air pump 10, an air valve, and an airbag 8 in the same number as the sampling chamber 2; The output end of the air pump 10 is connected to one end of the air valve through the first air guide pipe, and the other end of the air valve is connected to the second air guide pipe 4 set at the top of the sleeve through the retractable air guide pipe. The second air guide tube 4 extends into the sleeve and is connected to one end of the third air guide tube 5, which is located inside the sleeve, through a rotary joint. The airbag 8 is set in the sampling chamber 2 and is set one-to-one with the sampling chamber 2; the other end of the third air guide tube 5 is connected to multiple branch tubes, each branch tube is connected to the airbag in the sampling chamber 2, and each branch tube is equipped with an air inlet valve. The control module is also electrically connected to the air pump 10, air valves, and various air intake valves to control the inflation of the designated airbag 8.

[0028] Preferably, the second air guide tube 4 and the third air guide tube 5 are both located on the same axis as the sleeve 1.

[0029] Preferably, the rotating mechanism includes a first gear 7, a second gear 6, and a first motor; The first motor is installed inside the sampling chamber 2, and the output shaft of the first motor is connected to the first gear 7. The second gear 6 is fixedly installed on the outer surface of the third air pipe 5 and meshes with the first gear 7; The first motor is connected to the control module and is used to control the first motor to drive the first gear 7 to rotate, so that the second gear 6 and the third air pipe 5 rotate, thereby driving the rotating plate to rotate.

[0030] Preferably, a depth sensor for detecting the depth of the device is also provided at the first water inlet 3, and the depth sensor is connected to the control module.

[0031] In this embodiment, the depth sensor is a pressure level gauge or a radar / ultrasonic non-contact level gauge.

[0032] Preferably, the control module has a preset sampling program that can automatically control the rotating mechanism to switch sampling chambers according to the preset depth signal, and control the solenoid valve, air pump 10, air valve and corresponding air inlet valve to open for sampling.

[0033] Preferably, it also includes a rope winder 11, the output end of which is connected to the sleeve 1 via a rope. The rope winder 11 is connected to a control module, and the control module controls the rise / fall of the sleeve 1 by controlling the length of the rope in the rope winder 11.

[0034] Preferably, a filter screen is also provided at sampling port 9.

[0035] Preferably, gravity blocks 12 for traction by ropes are provided on both sides of the sleeve 1.

[0036] Example 2

[0037] A sampling method for groundwater detection, using the sampling device of Example 1, the sampling method includes the following steps: S1. Lower the sampling device to the target sampling depth of groundwater; S2. The control module controls the rotation mechanism to start, drives the rotating plate to rotate, so that the sampling port 9 of a designated sampling chamber 2 is connected to the first water inlet 3 on the sleeve 1. S3. The control module controls the air inlet valve corresponding to the designated sampling chamber 2 to open, and controls the air pump 10 and the air valve to start, inflating the air bag 9 in the sampling chamber 2 through the third air guide pipe 5 and the branch pipe until the air bag 9 expands so that the pressure in the sampling chamber 2 where it is located reaches the balance with the external water pressure. S4. Under pressure balance, the control module controls the solenoid valve at the first inlet 3 to open, so that groundwater enters the sampling chamber 2 through the first inlet 3 and the corresponding sampling port 9, and completes the fixed-depth water sample collection. S5. After sampling is completed, the control module controls the solenoid valve to close and controls the airbag 8 to deflate and contract. S6. Repeat the above steps and switch between different sampling chambers 2 by rotating the mechanism to achieve multiple groundwater samplings at different depths or locations.

[0038] In this embodiment, in step S1, the control module precisely controls the descent depth and position of the sleeve by controlling the winding and unwinding length of the rope of the rope reel based on the real-time depth signal fed back by the depth sensor.

[0039] In this embodiment, the control module has a preset sampling program; the sampling method includes: the control module receiving at least one preset target sampling depth signal; when the depth sensor detects that the current depth of the sampling device reaches any target sampling depth, the control module automatically triggers and executes the subsequent steps of switching the sampling chamber, inflating the airbag to balance the pressure, and opening the solenoid valve for sampling.

[0040] In this embodiment, in step S3, the airbag inflates and occupies part of the volume of the sampling chamber 2, causing the air inside the chamber to be moderately compressed, increasing its pressure to be equal to the external water pressure. This effectively prevents external water and impurities from entering before the solenoid valve opens.

[0041] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A sampling device for groundwater detection, characterized in that, include: A sleeve, wherein a first water inlet is provided on the side wall of the sleeve, and a solenoid valve is provided at the first water inlet; Multiple sampling chambers are evenly distributed along the circumference of the sleeve and rotatably disposed inside the sleeve via a rotating plate. Each sampling chamber is provided with a sampling port. The rotating plate is rotatable to selectively connect the sampling port of one of the sampling chambers with the first water inlet on the sleeve. A rotating mechanism is disposed inside the sleeve. The output end of the rotating mechanism is connected to the rotating plate and is used to drive the rotating plate to rotate, so as to switch different sampling chambers so that their sampling ports are connected to the first water inlet. A control module is connected to the solenoid valve and the rotating mechanism respectively, and is used to control the start and stop of the rotating mechanism and the opening and closing of the solenoid valve.

2. The sampling device for groundwater detection according to claim 1, characterized in that, It also includes an air pump, air valves, and airbags in the same number as the sampling chambers; The output end of the air pump is connected to one end of the air valve through the first air guide pipe, and the other end of the air valve is connected to the second air guide pipe provided on the top of the sleeve through the retractable air guide pipe. The second air guide tube extends into the sleeve and is connected to one end of the third air guide tube disposed inside the sleeve via a rotary joint; The airbag is installed in the sampling chamber and is installed in a one-to-one correspondence with the sampling chamber; the other end of the third air guide tube is connected to multiple branch tubes, each of which is connected to an airbag in the sampling chamber, and each branch tube is equipped with an air inlet valve. The control module is also electrically connected to the air pump, the air valve, and each of the air intake valves, for controlling the inflation of the designated airbag.

3. A sampling device for groundwater detection according to claim 2, characterized in that, Both the second and third air guide tubes are located on the same axis as the sleeve.

4. A sampling device for groundwater detection according to claim 3, characterized in that, The rotating mechanism includes a first gear, a second gear, and a first motor; The first motor is disposed in the sampling chamber, and the output shaft of the first motor is connected to the first gear; The second gear is fixedly mounted on the outer surface of the third air guide tube and meshes with the first gear; The first motor is connected to the control module and is used to control the first motor to drive the first gear to rotate, thereby causing the second gear and the third air pipe to rotate, which in turn drives the rotating plate to rotate.

5. A sampling device for groundwater detection according to claim 2, characterized in that, A depth sensor for detecting the depth of the device is also provided at the first water inlet, and the depth sensor is connected to the control module.

6. A sampling device for groundwater detection according to claim 5, characterized in that, The control module has a preset sampling program that can automatically control the rotating mechanism to switch the sampling chamber according to the preset depth signal, and control the solenoid valve, the air pump, the air valve and the corresponding air inlet valve to open for sampling.

7. A sampling device for groundwater detection according to claim 2, characterized in that, It also includes a rope winder, the output end of which is connected to the sleeve via a rope. The rope winder is connected to the control module, and the control module controls the raising / lowering of the sleeve by controlling the length of the rope winder.

8. A sampling device for groundwater detection according to claim 1, characterized in that, A filter screen is also installed at the sampling port.

9. A sampling device for groundwater detection according to claim 1, characterized in that, The sleeve is provided with gravity blocks for traction by ropes on both sides.

10. A sampling method for groundwater detection, characterized in that, The sampling apparatus according to any one of claims 2-9, characterized in that the sampling method comprises the following steps: S1. Lower the sampling device to the target sampling depth of groundwater; S2. The control module controls the rotation mechanism to start, drives the rotating plate to rotate, so that the sampling port of a designated sampling chamber is connected to the first water inlet on the sleeve. S3. The control module controls the opening of the air inlet valve corresponding to the designated sampling chamber, and controls the air pump and the air valve to start, inflating the airbag in the sampling chamber through the third air guide pipe and the branch pipe until the airbag expands so that the pressure in the sampling chamber is balanced with the external water pressure. S4. Under pressure balance, the control module controls the solenoid valve at the first water inlet to open, so that groundwater enters the sampling chamber through the first water inlet and the corresponding sampling port to complete the fixed-depth water sample collection. S5. After sampling is completed, the control module controls the solenoid valve to close and controls the airbag to deflate and contract. S6. Repeat the above steps and switch between different sampling chambers by rotating the mechanism to achieve multiple groundwater samplings at different depths or locations.

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