Underground water fixed-depth sampling device

Abstract

The invention discloses an underground water fixed-depth sampling device, which belongs to the technical field of sampling, and comprises an outer cylinder, a counterweight is slidably arranged in the outer cylinder, a sampling cylinder is arranged at the lower end of the counterweight, and the sampling cylinder adopts a telescopic pipe structure; a sampling barrel is arranged at the lower end of the sampling barrel; a filter head is arranged at the bottom of the sampling barrel; a sampling cavity is formed between the upper part of the counterweight and the outer cylinder; a water sample outlet pipe is arranged in the center of the upper end of the outer cylinder, and the top of the counter weight penetrates out of the water sample outlet pipe through a rope and then is connected with a lifting assembly; sealing mechanisms are arranged at the upper and lower ends of the outer cylinder. The underground water fixed-depth sampling device adapts to complex well conditions through sealing mechanisms at the upper end and the lower end of the outer barrel to prevent sample pollution, a filter head anti-blocking stabilizing device at the lower end of the sampling barrel, a counterweight and the outer barrel are in sliding fit, cleaning is easy, cross contamination is reduced, the representativeness and accuracy of underground water samples are finally guaranteed, and reliable data support is provided for related work.

Description

Technical Field

[0001] This invention relates to the field of sampling technology, and in particular to a groundwater depth sampling device. Background Technology

[0002] Groundwater sampling is a core component of hydrogeological surveys, contaminated site assessments, and water source protection. The quality of the samples directly determines the reliability of subsequent experimental analyses, thus influencing the scientific validity of site investigation conclusions, pollution control plans, and water source protection strategy planning. In actual exploration scenarios, well conditions are complex and variable, and the environment for deep groundwater sampling is harsh. The technical limitations of existing fixed-depth sampling devices are becoming increasingly apparent, failing to meet the requirements for high-precision and high-reliability sampling, thus becoming a bottleneck restricting the efficient implementation of related work.

[0003] Existing fixed-depth sampling devices generally employ fixed-size sealing structures. While this design is simple, it suffers from extremely poor adaptability. In complex well conditions with uneven walls and well-developed rock fissures, the fixed sealing structure cannot form a tight seal with the well wall, easily leading to leakage and mixing between adjacent water layers at the sealing gaps. This results in the target water layer sample being diluted or contaminated by other water bodies, losing its original representativeness. Furthermore, during deep groundwater sampling, the device is susceptible to the impact of downhole water flow, resulting in insufficient overall stability and difficulty in guaranteeing sampling accuracy. When the downhole sediment content is high, the sampling channel and filter components are prone to blockage, affecting sampling efficiency and potentially damaging device components. In addition, the sampling chamber and channels of existing devices are difficult to clean, and residual samples after multiple samplings can easily mix with new samples, causing cross-contamination and further reducing the accuracy of sample analysis results. This fails to meet the requirements of scenarios with extremely high sample purity, such as contaminated site assessment.

[0004] Based on the aforementioned deficiencies of existing technologies, this invention proposes a groundwater depth sampling device. By optimizing the overall structural design, it achieves multiple functions such as adaptability to complex well conditions, anti-clogging, anti-cross-contamination, and stable sampling, effectively solving the pain points of existing devices. Summary of the Invention

[0005] The purpose of this invention is to provide a groundwater depth sampling device to solve the above-mentioned problems.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This invention discloses a groundwater depth-based sampling device, comprising an outer cylinder, a counterweight slidably disposed within the outer cylinder, a sampling cylinder disposed at the lower end of the counterweight, the sampling cylinder employing a telescopic tube structure, an inlet cylinder disposed at the lower end of the sampling cylinder, and a filter head disposed at the bottom of the inlet cylinder; a sampling chamber is formed between the upper part of the counterweight and the outer cylinder; the counterweight is connected to the sampling cylinder, a water sample outlet pipe is provided at the center of the upper end of the outer cylinder, and a lifting assembly is connected to the top of the counterweight via a rope passing through the water sample outlet pipe; sealing mechanisms are provided at both the upper and lower ends of the outer cylinder.

[0007] Furthermore, the sample inlet cylinder includes a shell, with a transmission mechanism placement groove at the center of the shell; a matching cover is provided above the shell, with a water inlet hole integrally formed at the center of the cover to cooperate with the transmission mechanism placement groove; a water wheel mechanism is provided in the water inlet hole, and the transmission shaft of the water wheel mechanism passes through the center hole and is connected to a bevel gear transmission mechanism, which is located in the placement groove; the other end of the bevel gear transmission mechanism is connected to a hollow shaft, the top of the hollow shaft is connected to the water inlet hole, and the lower end of the hollow shaft extends into the filter head and is connected to an anti-clogging mechanism.

[0008] Furthermore, the bevel gear transmission mechanism includes meshing bevel gears.

[0009] Furthermore, the anti-clogging mechanism includes a bushing disposed on the outer periphery of the hollow shaft, connecting rods symmetrically disposed on the outer periphery of the bushing, and anti-clogging brushes distributed downwardly disposed at the end of the connecting rods away from the bushing, the anti-clogging brushes abutting against the inner sidewall of the filter head.

[0010] Furthermore, the side wall of the water inlet is provided with a shaft hole through which the drive shaft passes.

[0011] Furthermore, mechanical seals are provided between the water inlet and the hollow shaft, as well as between the shaft hole and the drive shaft.

[0012] Furthermore, a one-way valve is provided between the top of the injection tube and the sampling tube.

[0013] Furthermore, a water channel communicating with the sampling cylinder is provided at the center of the counterweight, and a one-way valve is provided on the water channel.

[0014] Furthermore, the sealing mechanism includes a sealing airbag one located at the top of the outer cylinder and a sealing airbag two located at the bottom of the outer cylinder. Both sealing airbag one and sealing airbag two are annular airbags. After being inflated, sealing airbag one and sealing airbag two press against the well wall. An air pipe two is provided on the outer side wall of the outer cylinder. One end of the air pipe two is connected to the sealing airbag two, and the other end passes through the water sample outlet pipe and extends to the outside of the water sample outlet pipe to connect with the air source. The sealing airbag one is connected to the air pipe one, and the other end of the air pipe one passes through the water sample outlet pipe and extends to the outside of the water sample outlet pipe to connect with the air source.

[0015] Furthermore, symmetrical lifting rings are provided at the top of the outer cylinder, and the lifting rings are connected to the winch via lifting ropes.

[0016] Compared with the prior art, the beneficial technical effects of the present invention are as follows: This invention, a groundwater depth-based sampling device, features sealing mechanisms at both ends of the outer cylinder. This allows for flexible adaptation to complex well conditions with uneven walls and fractures, effectively preventing leakage and mixing between adjacent water layers and avoiding sample contamination. A filter head at the lower end of the sampling cylinder filters out sediment and impurities, reducing the risk of clogging during deep sampling and improving the device's stability under water flow impact. The sliding cooperation between the counterweight and the outer cylinder facilitates rapid cleaning after each sampling, reducing cross-contamination during multiple sampling processes. Ultimately, this ensures the representativeness and accuracy of the collected groundwater samples, providing reliable data support for hydrogeological surveys, contaminated site assessments, and water source protection. In summary, this invention's groundwater depth-based sampling device, through its sealing mechanisms at both ends of the outer cylinder to adapt to complex well conditions and prevent sample contamination, its anti-clogging and stable filter head at the lower end of the sampling cylinder, and its sliding cooperation between the counterweight and the outer cylinder for easy cleaning and reduced cross-contamination, ultimately ensures the representativeness and accuracy of groundwater samples, providing reliable data support for related work. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a structural diagram of the groundwater depth sampling device of the present invention; Figure 2 This is a structural diagram of the sampling chamber under compression. Figure 3 This is a cross-sectional view of the groundwater depth sampling device of the present invention; Figure 4 This is an enlarged view of A; Figure 5 This is an enlarged view of the filter head; Figure 6 This is a schematic diagram of the water turbine mechanism. Figure 7 Schematic diagram of the anti-clogging brush distribution structure; Explanation of reference numerals in the attached drawings: 1. Well wall; 2. Outer cylinder; 3. Counterweight; 4. One-way valve 1; 5. Water channel; 6. Sampling cylinder; 7. One-way valve 2; 8. Sampling chamber; 9. Rope; 10. Water sample outlet pipe; 11. Sealing airbag 1; 12. Sealing airbag 2; 13. Air pipe 1; 14. Air pipe 2; 15. Lifting ring; 16. Filter head; 17. Cover; 18. Water inlet; 19. Water turbine mechanism; 20. Shell; 21. Transmission mechanism placement slot; 22. Bevel gear transmission mechanism; 23. Hollow shaft; 24. Bushing; 25. Connecting rod; 26. Anti-clogging brush; 27. Shaft hole. Detailed Implementation

[0019] like Figure 1-7 As shown, a groundwater depth sampling device includes an outer cylinder 2, a counterweight 3 slidably installed inside the outer cylinder 2, and a sampling cylinder 6 with a telescopic tube structure installed at the lower end of the counterweight 3. An inlet cylinder is installed at the lower end of the sampling cylinder 6, and a filter head 16 is installed at the bottom of the inlet cylinder. A sampling chamber 8 is formed between the upper part of the counterweight 3 and the outer cylinder 2. The counterweight 3 is connected to the sampling cylinder 6. A water sample outlet pipe 10 is opened at the center of the upper end of the outer cylinder 2. The top of the counterweight 3 is connected to a lifting assembly after passing through the water sample outlet pipe 10 via a rope 9. Sealing mechanisms are installed at both the upper and lower ends of the outer cylinder 2. Specifically, during sampling, the counterweight 3 compresses the sampling cylinder 6, and then the outer cylinder 2 is placed inside the sampling well wall 1. When the sampling is performed at the appropriate position, the upper and lower parts of the outer cylinder 2 are sealed by the sealing mechanism. Then, the counterweight 3 is pulled upward by the lifting component, creating a pressure difference inside the sampling cylinder 6. The water sample enters the sampling cylinder 6 after being filtered by the filter head 16. Finally, the counterweight 3 compresses the sampling cylinder 6 again, and the water sample enters the sampling chamber 8 above the sampling cylinder 6, completing the sampling operation.

[0020] The sample inlet cylinder includes a housing 20, with a transmission mechanism placement groove 21 at its center. A matching cover 17 is mounted on top of the housing 20, and a water inlet hole 18, which mates with the transmission mechanism placement groove 21, is integrally formed at the center of the cover 17. A water turbine mechanism 19 is installed inside the water inlet hole 18. The drive shaft of the water turbine mechanism 19 passes through the central hole 18 and connects to a bevel gear transmission mechanism 22. A shaft hole 27 is provided on the side wall of the water inlet hole 18 for the drive shaft to pass through. The bevel gear transmission mechanism 22 includes meshing bevel gears and is located within the placement groove 21. The other end of the bevel gear transmission mechanism 22 is connected to a hollow shaft 23. The top of the hollow shaft 23 communicates with the water inlet hole 18, and the lower end of the hollow shaft 23 extends into the filter head 16 and connects to an anti-clogging mechanism. Specifically, after the water sample enters the sample inlet cylinder 6 through the filter head 16, it impacts the blades of the water turbine mechanism 19 inside the water inlet hole 18, driving the transmission shaft of the water turbine mechanism 19 to rotate. The rotational power of the transmission shaft is transmitted to the hollow shaft 23 through the bevel gear transmission mechanism 22. The rotation of the hollow shaft 23 drives the anti-clogging mechanism to operate synchronously, thereby achieving anti-clogging and cleaning of the filter head 16 during the sampling process.

[0021] The anti-clogging mechanism includes a bushing 24 mounted on the outer periphery of the hollow shaft 23. Connecting rods 25 are symmetrically mounted on the outer periphery of the bushing 24. Anti-clogging brushes 26 are downwardly distributed at the end of each connecting rod 25 away from the bushing 24, and the anti-clogging brushes 26 abut against the inner wall of the filter head 16. The anti-clogging brushes 26 rotate with the hollow shaft 23, cleaning the inner wall of the filter head 16 to prevent clogging.

[0022] Mechanical seals are installed between the water inlet 18 and the hollow shaft 23, as well as between the shaft hole 27 and the drive shaft, which can effectively prevent water sample leakage and the intrusion of external impurities, ensuring the sealing of the sampling channel and the stability of the sampling process.

[0023] A one-way valve 7 is installed between the top of the injection tube and the sampling tube 6. A water channel 5, communicating with the sampling tube 6, is opened at the center of the counterweight 3. A one-way valve 4 is installed on the water channel 5. This ensures that the water sample can only flow along a one-way path from the injection tube to the sampling tube 6 to the water channel 5, preventing backflow of the water sample due to device shaking or water pressure changes during sampling. At the same time, it prevents external air or liquid from other water layers in the well from seeping back into the sampling chamber 8, preventing the sample from being diluted or contaminated, and ensuring the purity and representativeness of the groundwater sample.

[0024] The sealing mechanism includes a sealing airbag 11 located at the top of the outer cylinder 2 and a sealing airbag 22 located at the bottom of the outer cylinder 2. Both sealing airbag 11 and sealing airbag 22 are annular airbags. After being inflated, sealing airbag 11 and sealing airbag 22 press against the well wall 1. An air pipe 24 is installed on the outer side wall of the outer cylinder 2. One end of the air pipe 24 is connected to the sealing airbag 22, and the other end passes through the water sample outlet pipe 10 and extends to the outside of the water sample outlet pipe 10 and is connected to the air source. The sealing airbag 11 is connected to an air pipe 13, and the other end of the air pipe 13 passes through the water sample outlet pipe 10 and extends to the outside of the water sample outlet pipe 10 and is connected to the air source. When the gas source is supplying gas, the gas flow passes through the gas pipe 13 and gas pipe 14 through the water sample outlet pipe 10 and is delivered to the sealing airbag 11 at the top and the sealing airbag 22 at the bottom of the outer cylinder 2, respectively. After the annular sealing airbag 11 and sealing airbag 22 are inflated, they expand and tightly abut against the well wall 1, forming two sealing barriers. After sampling is completed, the gas in the airbag is discharged, the airbag contracts and resets, and can be recovered by the rope lifting device.

[0025] The top of the outer cylinder 2 is symmetrically equipped with lifting rings 15. The lifting rings 15 are connected to the winch by the lifting rope. The winch’s winding and unwinding actions can smoothly control the raising and lowering of the device in the well. With the traction of the counterweight 3 by the rope 9, the device can be accurately positioned at a certain depth and safely retrieved after sampling.

[0026] The working process of this invention is as follows: First, preliminary preparation: After the device is assembled, connect the lifting rings 15 symmetrically installed on the top of the outer cylinder 2 to the hoisting rope of the winch, and at the same time, pass the rope 9 on the top of the counterweight 3 through the water sample outlet pipe 10 and connect it to the lifting assembly; connect the ends of the air pipe 13 and the air pipe 2 14 to the external air source, and then lower the device through the winch until the outer cylinder 2 reaches the target sampling depth inside the well wall 1.

[0027] Secondly, well section sealing: when the gas source is activated, the gas flow passes through the gas pipe 13 and gas pipe 2 14 installed inside the water sample outlet pipe 10, and is delivered to the sealing airbag 11 at the top and the sealing airbag 22 at the bottom of the outer cylinder 2 respectively; after the annular sealing airbag 11 and sealing airbag 2 12 are inflated, they expand and press tightly against the well wall 1, forming two sealing barriers to prevent water samples from adjacent water layers from leaking and mixing.

[0028] Next, sampling preparation and negative pressure water introduction: Before sampling, the counterweight 3 is moved downward by the lifting component, squeezing the sampling cylinder 6, which has a telescopic tube structure at its lower end, so that the sampling cylinder 6 is in a contracted state; then the lifting component is operated to pull the rope 9, which drives the counterweight 3 to move upward. The sampling cylinder 6 is stretched synchronously with the counterweight 3 and generates a negative pressure difference; the well water sample is subjected to negative pressure, and after being filtered by the filter head 16 to remove mud and sand impurities, it enters the sampling cylinder.

[0029] Then, the anti-clogging linkage of the sample inlet tube: when the water sample enters the sample inlet tube, it impacts the blades of the water turbine mechanism 19 inside the water inlet hole 18, driving the transmission shaft of the water turbine mechanism 19 to rotate; the rotational power of the transmission shaft is transmitted to the hollow shaft 23 through the bevel gear transmission mechanism 22. The lower end of the hollow shaft 23 extends into the filter head 16 and is connected to the anti-clogging mechanism. As the hollow shaft 23 rotates, the anti-clogging mechanism operates synchronously to clean the filter head 16 in real time and prevent the filter head from clogging; during this process, the mechanical seal between the water inlet hole 18 and the hollow shaft 23, and between the shaft hole 27 and the transmission shaft, can effectively prevent water sample leakage and the intrusion of external impurities.

[0030] Next, the water sample is transported and temporarily stored in one direction: the water sample entering the sample inlet tube flows into the sampling tube 6 through the one-way valve 2 7. The one-way valve 4 on the water channel 5 is closed to prevent air from entering and affecting the sampling. After the sampling tube 6 is filled with water sample, the counterweight 3 is driven to move downward and squeeze the sampling tube 6. After the water sample is compressed, it opens the one-way valve 4 and enters the sampling chamber 8 between the counterweight 3 and the outer tube 2 through the water channel 5 in the center of the counterweight 3 for temporary storage. At this time, the one-way valve 2 7 closes in the reverse direction to prevent the water sample from flowing back into the sample inlet tube.

[0031] Finally, the device is recovered and the water sample is taken out: After sampling is completed, the gas source is turned off, the gas in the sealing airbag 11 and sealing airbag 2 12 is discharged, and the airbags are contracted and reset; the winch is operated to pull the hoisting rope to lift the outer cylinder 2 out of the well as a whole, and finally the water sample in the sampling chamber 8 is exported through the water sample outlet pipe 10 to complete the sampling operation.

[0032] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A groundwater depth sampling device, characterized in that: The device includes an outer cylinder (2), a counterweight (3) is slidably disposed inside the outer cylinder (2), a sampling cylinder (6) is disposed at the lower end of the counterweight (3), the sampling cylinder (6) adopts a telescopic tube structure; an inlet cylinder is disposed at the lower end of the sampling cylinder (6), and a filter head (16) is disposed at the bottom of the inlet cylinder; a sampling chamber (8) is formed between the upper part of the counterweight (3) and the outer cylinder (2); the counterweight (3) is connected to the sampling cylinder (6), a water sample outlet pipe (10) is opened at the center of the upper end of the outer cylinder (2), and the top of the counterweight (3) is connected to the lifting assembly after passing through the water sample outlet pipe (10) via a rope (9); a sealing mechanism is disposed at both the upper and lower ends of the outer cylinder (2).

2. The groundwater depth sampling device according to claim 1, characterized in that: The sample inlet cylinder includes a housing (20), and a transmission mechanism placement groove (21) is provided at the center of the housing (20). A matching cover (17) is provided above the housing (20), and a water inlet hole (18) that cooperates with the transmission mechanism placement groove (21) is integrally formed at the center of the cover (17). A water turbine mechanism (19) is provided in the water inlet hole (18), and the transmission shaft of the water turbine mechanism (19) passes through the center hole (18) and is connected to a bevel gear transmission mechanism (22). The bevel gear transmission mechanism (22) is located in the placement groove (21). The other end of the bevel gear transmission mechanism (22) is connected to a hollow shaft (23). The top of the hollow shaft (23) is connected to the water inlet hole (18), and the lower end of the hollow shaft (23) extends into the filter head (16) and is connected to an anti-clogging mechanism.

3. The groundwater depth sampling device according to claim 2, characterized in that: The bevel gear transmission mechanism (22) includes bevel gears that mesh with each other.

4. The groundwater depth sampling device according to claim 2, characterized in that: The anti-clogging mechanism includes a bushing (24) disposed on the outer periphery of the hollow shaft (23). A connecting rod (25) is symmetrically disposed on the outer periphery of the bushing (24). An anti-clogging brush (26) is disposed at the end of the connecting rod (25) away from the bushing (24) and is distributed downwardly. The anti-clogging brush (26) abuts against the inner wall of the filter head (16).

5. The groundwater depth sampling device according to claim 2, characterized in that: The side wall of the water inlet (18) is provided with a shaft hole (27) for the drive shaft to pass through.

6. The groundwater depth sampling device according to claim 2, characterized in that: Mechanical seals are provided between the water inlet (18) and the hollow shaft (23), as well as between the shaft hole (27) and the drive shaft.

7. The groundwater depth sampling device according to claim 1, characterized in that: A one-way valve (7) is provided between the top of the injection tube and the sampling tube (6).

8. The groundwater depth sampling device according to claim 1, characterized in that: A water channel (5) communicating with the sampling cylinder (6) is provided at the center of the counterweight (3), and a one-way valve (4) is provided on the water channel (5).

9. The groundwater depth sampling device according to claim 1, characterized in that: The sealing mechanism includes a sealing airbag one (11) located at the top of the outer cylinder (2) and a sealing airbag two (12) located at the bottom of the outer cylinder (2). Both the sealing airbag one (11) and the sealing airbag two (12) are annular airbags. After the sealing airbag one (11) and the sealing airbag two (12) are inflated, they press against the well wall (1). An air pipe two (14) is provided on the outer side wall of the outer cylinder (2). One end of the air pipe two (14) is connected to the sealing airbag two (12), and the other end passes through the water sample outlet pipe (10) and extends to the outside of the water sample outlet pipe (10) to connect to the air source. The sealing airbag one (11) is connected to the air pipe one (13), and the other end of the air pipe one (13) passes through the water sample outlet pipe (10) and extends to the outside of the water sample outlet pipe (10) to connect to the air source.

10. The groundwater depth sampling device according to claim 1, characterized in that: The top of the outer cylinder (2) is symmetrically provided with lifting rings (15), and the lifting rings (15) are connected to the winch by a lifting rope.

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