Underground water solid sampling device and sampling method

Abstract

The invention provides an underground water solid sampling device and a sampling method, relates to an underground water sampling technology, and particularly discloses a mounting shell, a displacement seat, a sectioning plate, a sealing plate, a driving structure, a buoyancy structure, a pushing structure, a coolant storage shell and an opening and closing structure. An independent sampling area is defined on a target water layer site, then freezing treatment is conducted on the sampling area through a cooling system composed of a coolant storage shell and a cooling cavity, a captured water sample is instantly frozen into solid ice columns, a driving structure controls a displacement base to carry the length of a sectioning plate extending out of a shell, and a sealing plate is driven to synchronously move; the volume of the sampling area can be flexibly adjusted, so that the requirements of different aquifer thicknesses or different sampling volumes can be met.

Description

Technical Field

[0001] This invention relates to the field of groundwater sampling technology, and more specifically, to a groundwater solid sampling device and sampling method. Background Technology

[0002] Groundwater is an important natural resource, and its water quality monitoring and sampling analysis are of great significance for environmental protection, water resource management, and pollution prevention and control. Traditional groundwater sampling methods mostly use open samplers or single-layer sampling devices, which have problems such as susceptibility to external contamination during the sampling process, mixing of water between layers, and poor sample representativeness. Especially in water bodies with distinct stratification, the water quality characteristics at different depths differ significantly. If the sampling device cannot effectively isolate the water layers, it will lead to mixing of water between layers (cross-contamination), affecting the accuracy of the analysis results.

[0003] Furthermore, in the existing technology, some sampling devices attempt to achieve stratified sampling through mechanical seals or multi-chamber structures. However, since the existing sampling devices are cylindrical multi-cavity structures, when they are lowered into the area to be sampled, the complete cylindrical structure causes significant disturbance to the water, which can easily cause the water in the stratified state to mix. In addition, when the water in the sampling area flows into the vertically arranged chambers through the holes, it will also aggravate the disturbance of the water in the sampling area, thus leading to the problem of water mixing between different layers. Summary of the Invention

[0004] The purpose of this invention is to provide a groundwater solid sampling device and sampling method, which addresses the shortcomings of existing technologies and solves the problems mentioned in the background.

[0005] The technical solution of this invention is implemented as follows: This invention provides a groundwater solid sampling device, including a mounting housing, an inlet and outlet on one side of the mounting housing, a displacement seat slidably disposed inside the mounting housing, a plurality of segmented plates surrounding the side of the displacement seat near the inlet and outlet, and an installation space reserved between any two segmented plates; the mounting housing is provided with a driving structure for driving the displacement seat to move in and out of the mounting housing. The side wall of the displacement seat is surrounded by several sliding channels that are connected to the installation space. Each sliding channel is equipped with a sealing plate that matches the installation space. The installation housing is equipped with a mounting seat that is connected to several sealing plates. Each of the segmented plates has a pressure relief channel along its extension direction. A buoyancy structure is slidably installed in the pressure relief channel. A push structure is provided in the mounting housing that is connected to the buoyancy structure and the mounting base. The housing contains a coolant storage shell, and each sealing plate contains a cooling chamber that communicates with the coolant storage shell. The connection between the coolant storage shell and the cooling chamber is provided with an opening and closing mechanism.

[0006] In some technical solutions of the present invention, the drive structure includes a spiral channel opened on the inner wall of the mounting housing, a retainer sleeved on the outer wall of the displacement seat, a limiting frame embedded in the spiral channel on the outer wall of the retainer, a wheel set installed at the end of the limiting frame, the wheel surface of the wheel set abutting against the inner bottom wall of the spiral channel, and a drive motor connected to the wheel set for transmission is installed on the limiting frame.

[0007] In some technical solutions of the present invention, the buoyancy structure includes a float that is slidably disposed in a pressure relief channel, a buoyancy chamber is provided inside the float, a push rod is provided on the outer wall of the float, and the push structure is connected to the push rod in a driving connection.

[0008] In some technical solutions of the present invention, the pushing structure includes a U-shaped guide structure installed in the mounting housing, a guide channel is provided in the guide structure, a link structure is slidably provided in the guide channel, one side of the link structure passes through the mounting base and is connected to the pushing rod, and the other side of the link structure is connected to the mounting base.

[0009] In some technical solutions of the present invention, the outer arc surface of both the split plate and the sealing plate is provided with a heat insulation plate, and a gap is reserved between the heat insulation plate and the split plate or the sealing plate.

[0010] In some technical solutions of the present invention, the mounting base is provided with an inlet and outlet chamber that communicates with the cooling chamber, and a telescopic tube that communicates with the outer side wall of the coolant storage shell is provided. The telescopic tube communicates with the inlet and outlet chamber, and the opening and closing structure is located at the connection between the telescopic tube and the inlet and outlet chamber.

[0011] In some technical solutions of the present invention, the opening and closing structure includes a sealing seat, which is installed at the connection between the telescopic tube and the inlet / outlet chamber. The outer wall of the sealing seat has several installation ports, each of which is provided with a sealing plate connected to it. A sealing flap is rotatably provided in the installation port. The sealing flap passes through the sealing plate and is placed in the sealing seat. After the several sealing flaps are surrounded in the sealing seat, they form a disc-shaped structure to close the connection between the telescopic tube and the inlet / outlet chamber. A connecting seat is installed on the outer wall of the mounting seat, and a lever arm extending out of the installation port is provided on the side wall of the sealing flap. A pushing flow channel is provided in the sealing plate along its extension direction. The free end of the pushing flow channel passes through the mounting seat and extends outward. A float is slidably provided in the pushing flow channel. A connecting rod is provided on the outer wall of the float, and the connecting rod is connected to its corresponding lever arm in a transmission manner.

[0012] In some technical solutions of the present invention, a locking structure for locking the chain link structure is provided on the outer wall of the mounting base.

[0013] In some technical solutions of the present invention, the locking structure includes a locking ring channel formed on the outer wall of the mounting base. The locking ring channel is connected to the push flow channel. Two locking rods are slidably arranged in the locking ring channel, respectively located on both sides of the connecting rod. A return spring connected to the inner wall of the locking ring channel is sleeved on the outer wall of the locking rod. When the connecting rod gradually moves along the push flow channel to the push flow channel, the connecting rod pushes the locking rod to move towards the chain link structure until it abuts against the chain link structure.

[0014] Compared with the prior art, the present invention has at least the following advantages or beneficial effects: through the coordinated action of the segmented plate and the sealing plate, an independent "sampling area" is formed in the target water layer. Then, the area is frozen by a cooling system consisting of a coolant storage shell and a cooling chamber, instantly freezing the captured water sample into a solid ice column. The drive structure controls the displacement seat to carry the segmented plate out of the shell and drive the sealing plate to move synchronously. The volume of the sampling area can be flexibly adjusted to meet the needs of different aquifer thicknesses or different sampling volumes. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the working structure of the sampling device in this invention.

[0016] Figure 2 This is a half-section diagram of the sampling device in this invention.

[0017] Figure 3 This is a schematic diagram of the assembly structure of the coolant storage shell, the segmented plate and the sealing plate in this invention.

[0018] Figure 4 This is an assembly structure diagram of the split plate and sealing plate of the present invention.

[0019] Figure 5 This is a cross-sectional view of the mounting base and sealing plate in this invention.

[0020] Figure 6 This is a cross-sectional view of the housing structure in this invention.

[0021] Figure 7 for Figure 2 A magnified schematic diagram of the structure at point A in the middle.

[0022] Figure 8 for Figure 2 A magnified schematic diagram of the structure at point B in the middle.

[0023] Figure 9 for Figure 2 A magnified schematic diagram of the structure at point C.

[0024] Figure 10 for Figure 5 A partially enlarged schematic diagram of the opening and closing structure.

[0025] Figure 11 This is a top sectional view of the mounting base in this invention.

[0026] Reference numerals: 1. Mounting housing; 101. Inlet / outlet; 102. Cover; 2. Displacement seat; 201. Sliding channel; 3. Split plate; 301. Installation space; 302. Pressure relief channel; 4. Sealing plate; 401. Cooling chamber; 405. Pushing channel; 5. Drive structure; 501. Spiral channel; 502. Cage; 503. Limiting frame; 504. Wheel set; 505. Drive motor; 6. Buoyancy structure; 601. Float; 6011. Buoyancy chamber; 602. Push rod; 7. Pushing structure; 701 7011. Guiding structure; 702. Guide channel; 703. Link structure; 8. Coolant storage shell; 801. Telescopic tube; 9. Opening and closing structure; 901. Sealing seat; 9011. Mounting port; 902. Sealing plate; 903. Sealing flap; 904. Lever arm; 905. Float; 906. Connecting rod; 10. Mounting seat; 1001. Inlet and outlet chamber; 11. Sealing block; 12. Insulation plate; 1201. Gap; 13. Locking structure; 1301. Locking ring; 1302. Locking rod; 1303. Return spring. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0029] Example This invention provides a groundwater solid sampling device, such as... Figures 1-11As shown, the system includes a cylindrical mounting housing 1. One side of the mounting housing 1 has an inlet / outlet 101, and the other side has a removable cover 102, facilitating the exposure of the coolant storage tank 8 for subsequent addition of cooling medium, preparing for subsequent sampling. A circular displacement seat 2 slides within the mounting housing 1. At least four arc-shaped segmented plates 3 are integrally formed around the side of the displacement seat 2 closest to the inlet / outlet 101. An installation space 301 is reserved between any two segmented plates 3. The mounting housing 1 includes a drive structure 5 for driving the displacement seat 2 in and out of the mounting housing 1. When the drive structure 5 drives the four segmented plates 3 to slowly enter the water area to be sampled in the vertical direction, it does not cause significant fluctuations in the water area, avoiding violent disturbance to the static, stratified water body, thus ensuring the accuracy of stratified sampling.

[0030] The sidewall of the displacement seat 2 is surrounded by several sliding channels 201, each communicating with the installation space 301. Each sliding channel 201 contains a sealing plate 4 that matches the installation space 301. Furthermore, a mounting base 10, connected to the sealing plates 4, is slidably installed inside the mounting housing 1. The mounting base 10 and the sealing plates 4 are integrally formed, creating a housing structure with an internal cavity. When the sealing plates 4 are fully moved into the installation space 301 by the mounting base 10, the four sealing plates 4 and the four segmented plates 3 enclose a sealed sampling area along the circumference of the displacement seat 2, used to contain groundwater samples from a specific aquifer.

[0031] Each of the segmented plates 3 has a pressure relief channel 302 extending along its extension direction. A buoyancy structure 6 is slidably installed in the pressure relief channel 302. The mounting housing 1 has a push structure 7 that is connected to the buoyancy structure 6 and the mounting base 10. The buoyancy structure 6 generates buoyancy by utilizing water pressure changes, and converts it into the vertical movement of the mounting base 10 through the push structure 7, controlling the sealing plate 4 to enter the installation space 301 and form a sampling area for sampling the water area with the sealing plate 4.

[0032] The housing 1 contains a coolant storage tank 8, and each of the sealing plates 4 contains a cooling chamber 401 that communicates with the coolant storage tank 8. An opening and closing structure 9 is provided at the connection between the coolant storage tank 8 and the cooling chamber 401. In the sampling area, the coolant flows into the cooling chamber 401 through the opening and closing structure 9, causing the water sample within the sampling area to freeze at low temperature and solidify into an ice-like column within the area. This achieves non-contamination, stratified sampling of groundwater, avoiding interlayer mixing.

[0033] Preferably, the cooling medium is liquid nitrogen or similar.

[0034] In some technical solutions of the present invention, the drive structure 5 includes a spiral channel 501 formed on the inner wall of the mounting housing 1, a retainer 502 sleeved on the outer wall of the displacement seat 2, a limiting frame 503 embedded in the spiral channel 501 on the outer wall of the retainer 502, a wheel set 504 mounted on the end of the limiting frame 503, the wheel surface of the wheel set 504 abutting against the inner bottom wall of the spiral channel 501, and a drive motor 505 connected to the wheel set 504 mounted on the limiting frame 503. The drive motor 505 drives the limiting frame 503 to move within the spiral channel 501 through the wheel set 504. Under the guidance of the spiral channel 501, the limiting frame 503 drives the retainer 502 and the displacement seat 2 to rotate and move linearly simultaneously, thereby realizing the extension or retraction of the displacement seat 2 into the mounting housing 1. This design facilitates adjustment of the length of the sampling area enclosed by the sealing plate 4 and the segmented plate 3, enabling the device to adapt to the stratified sampling requirements of waters of different depths.

[0035] In some technical solutions of this invention, the buoyancy structure 6 includes a float 601 slidably disposed within the pressure relief channel 302. A buoyancy chamber 601 is formed within the float 601, and a push rod 602 is provided on the outer wall of the float 601. A push structure 7 is drively connected to the push rod 602. The float 601 slides within the pressure relief channel 302. When the water pressure changes, the buoyancy chamber 6011 generates buoyancy, causing the float 601 to move. The push rod 602 on the float 601 is connected to the push structure 7, transmitting the movement of the float 601 to the push structure 7. The buoyancy chamber 6011 can adjust the buoyancy to adapt to various groundwater conditions.

[0036] In some technical solutions of the present invention, the pushing structure 7 includes a U-shaped guide structure 701 installed inside the mounting housing 1. A guide channel 7011 is provided within the guide structure 701, and a link structure 702 is slidably disposed within the guide channel 7011. One side of the link structure 702 passes through the mounting base 10 and connects to the pushing rod 602, while the other side of the link structure 702 is connected to the mounting base 10. The link structure 702 slides within the guide channel 7011. When the pushing rod 602 moves, the link structure 702 drives the mounting base 10 to move vertically. The U-shaped design of the guide structure 701 ensures a stable movement trajectory for the link structure 702, preventing jamming.

[0037] The link structure 702 comprises several sets of chain segments that are sequentially hinged together. Any two adjacent chain segments are connected by a shaft, and torsion springs connected to the two chain segments are sleeved on the shaft. This gives the link structure 702 good flexibility. When the device reaches the target water layer, the float 601 changes position within the pressure relief channel 302 due to buoyancy. Guided by the pressure relief channel 302, it moves vertically upward, forcing the push rod 602 to push the link structure 702 to produce displacement. Furthermore, under the constraint of the U-shaped guide structure 701, the link structure 702 converts the horizontal pushing and pulling motion into the power to drive the mounting base 10 to move vertically downward, thereby controlling the sealing plate 4 to enter the installation space 301 and achieving the closure of the sampling area.

[0038] In some technical solutions of the present invention, the outer arc surfaces of the segmented plate 3 and the sealing plate 4 are provided with heat insulation plates 12, and a gap 1201 is reserved between the heat insulation plates 12 and the segmented plate 3 or the sealing plate 4. The outer arc surfaces of the segmented plate 3 and the sealing plate 4 are provided with heat insulation plates 12, and a gap 1201 is reserved between the heat insulation plates 12 and the plate body. This gap 1201 forms an air insulation layer on the outside of the sampling area formed by the segmented plate 3 and the sealing plate 4. Together with the heat insulation plate 12 material with low thermal conductivity, it effectively reduces the heat exchange between the external environment and the internal sampling area and accelerates the rapid cooling of the medium in the sampling area.

[0039] In some technical solutions of the present invention, the mounting base 10 has an inlet / outlet chamber 1001 communicating with the cooling chamber 401. A telescopic pipe 801 communicating with the coolant storage shell 8 is provided on the outer wall of the coolant storage shell 8. The telescopic pipe 801 provides a flexible connection to adapt to the movement of the mounting base 10. The opening / closing structure 9 adjusts the coolant flow rate as needed to achieve on-demand cooling. The telescopic pipe 801 communicates with the inlet / outlet chamber 1001, and the opening / closing structure 9 is located at the connection point between the telescopic pipe 801 and the inlet / outlet chamber 1001. Coolant flows from the coolant storage shell 8 into the inlet / outlet chamber 1001 of the mounting base 10 through the telescopic pipe 801, and then into the cooling chamber 401 of the sealing plate 4. The opening / closing structure 9 controls the flow of coolant; when cooling is needed, the connection point is opened, quickly filling the cooling chamber 401 located within the sealing plate 4, rapidly cooling the samples located within the sampling area, thereby freezing the water samples at each level.

[0040] In some technical solutions of the present invention, the opening and closing structure 9 includes a sealing seat 901, which is installed at the connection between the telescopic tube 801 and the inlet / outlet chamber 1001. A plurality of mounting ports 9011 are provided on the outer wall of the sealing seat 901, and each mounting port 9011 is provided with a sealing sheet 902 connected thereto. A sealing flap 903 is rotatably disposed within the mounting port 9011, passing through the sealing sheet 902 and placed inside the sealing seat 901. The plurality of sealing flaps 903, after surrounding the sealing seat 901, form a disc-shaped structure. The connection between the telescopic tube 801 and the inlet / outlet chamber 1001 is closed. A connecting seat is installed on the outer wall of the mounting base 10, and a lever arm 904 extending into the mounting port 9011 is provided on the side wall of the sealing flap 903. A push flow channel 405 is provided in each of the sealing plates 4 along its extension direction. The free end of the push flow channel 405 passes through the mounting base 10 and extends outward. A float 905 is slidably provided in the push flow channel 405. A connecting rod 906 is provided on the outer wall of the float 905, and the connecting rod 906 is connected to its corresponding lever arm 904. The lever arm 904 converts the linear motion of the connecting rod 906 into the rotational motion of the sealing flap 903 to realize opening and closing. The float 905 slides based on water pressure changes, triggering the movement of the connecting rod 906, automatically controlling the flow of coolant. The sealing flap 903 surrounds the sealing base 901 to form a disc-shaped structure, which closes the connection between the telescopic tube 801 and the inlet / outlet chamber 1001 by default. When the float 905 slides within the push channel 405, it pushes the lever 904 via the connecting rod 906, causing the sealing flap 903 to rotate and open the connection. At this time, the coolant can flow from the coolant storage shell 8 through the telescopic tube 801 and the inlet / outlet chamber 1001 into the cooling chamber 401, rapidly freezing the water sample in the sampling area and solidifying it into an ice column, thus perfectly preserving the original state of the water sample and avoiding interlayer mixing and deterioration.

[0041] Preferably, a sealing block 11 is slidably provided at the connection between the telescopic tube 801 and the inlet / outlet chamber 1001. The sealing block 11 has a frustum structure, with its small-diameter end facing the telescopic tube 801. A rod is mounted on the sealing block 11, and a spring connected to the sealing seat 901 is provided on the rod. The rod is hinged to the ends of several sealing flaps 903. In this way, the above structure provides a double barrier to the cooling medium.

[0042] In some technical solutions of the present invention, a locking structure 13 for locking the chain link structure 702 is provided on the outer side wall of the mounting base 10. The locking structure 13 is located on the outside of the mounting base 10. When the chain link structure 702 moves to a designated position, the locking structure 13 is activated to fix the chain link structure 702, prevent the chain link structure 702 from moving accidentally, and ensure the stability of the mounting base 10. The locking structure 13 fixes the chain link structure 702 by physically blocking it, preventing rebound or slippage.

[0043] In some technical solutions of the present invention, the locking structure 13 specifically includes a locking ring channel 1301 formed on the outer wall of the mounting base 10. The locking ring channel 1301 is connected to the push flow channel 405. Two locking rods 1302 are slidably disposed within the locking ring channel 1301, respectively located on both sides of the connecting rod 906. A return spring 1303 connected to the inner wall of the locking ring channel 1301 is sleeved on the outer wall of the locking rod 1302. When the connecting rod 906 moves to its end along the push flow channel 405, the connecting rod 906 pushes the locking rod 1302 toward the link structure 702 until it abuts against the link structure 702. The locking rod 1302 in the locking ring channel 1301 is disengaged from the link structure 702 by default under the action of the return spring 1303 in the initial state and is in an unlocked state. When the connecting rod 906 moves to the end of the push channel 405, it pushes the locking rods 1302 on both sides to overcome the elastic force of the return spring 1303 and move towards the link structure 702 until the end of the locking rod 1302 is tightly abutted against the link structure 702, thereby achieving mechanical locking and preventing the link structure 702 from accidentally rebounding or moving during the sampling process, ensuring the absolute stability of the position of the mounting base 10 and the sealing plate 4. When the connecting rod 906 is reset, the return spring 1303 resets the locking rod 1302 after the locking is released. The return spring 1303 provides a restoring force, causing the locking rod 1302 to disengage normally. When the connecting rod 906 pushes, it overcomes the spring force to achieve locking.

[0044] The sampling method mainly includes the following steps: S1. Lowering and Positioning: The hoisting rope lowers the installation housing 1 to the sampling area. The displacement seat 2, carried by the unfolded split plate 3, is controlled by the drive structure 5 and extends into the water through the inlet and outlet 101 until the target sampling depth is reached.

[0045] S2, Triggering Seal: The water pressure at the target water layer causes the buoyancy structure 6 to shift, and the pushing structure 7 drives the mounting base 10 and the sealing plate 4 to move downward, so that the sealing plate 4 is precisely inserted into the installation space 301 between the split plates 3, forming a sealed sampling area.

[0046] S3. Freezing sampling: The opening and closing structure 9 is opened by the floating element 905 in the sealing plate 4, and the coolant flows from the coolant storage shell 8 into the cooling chamber 401 of the sealing plate 4 to quickly freeze the water sample in the sampling area and form a solid ice column.

[0047] S4. Sample recovery: The installation shell 1 is lifted to the water surface by a hoisting rope to complete the stratified sampling.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A groundwater solid sampling device, characterized by, The utility model provides a kind of installation shell, one side of the installation shell is equipped with inlet and outlet, displacement seat is slidably arranged in the installation shell, and the side of displacement seat near inlet and outlet is surrounded by a plurality of split plates, and installation space is reserved between any two split plates;The installation shell is equipped with driving structure for driving displacement seat into and out of installation shell; A plurality of sliding channels are arranged on the side wall of the displacement seat, which are in communication with the installation spaces, respectively, and a sealing plate matched with the installation space is slidably arranged in each sliding channel, and an installation seat connected with the plurality of sealing plates is slidably arranged in the installation shell. A pressure relief channel is formed in each split plate along its extension direction, and a buoyancy structure is slidably arranged in the pressure relief channel, and a pushing structure is drivingly connected with the buoyancy structure and the installation seat in the installation shell. A coolant storage shell is arranged in the installation shell, and a cooling chamber in communication with the coolant storage shell is arranged in each sealing plate, and an opening and closing structure is arranged at the communication position of the coolant storage shell and the cooling chamber.

2. The groundwater solid sampling device of claim 1, wherein, The driving structure includes a spiral channel formed on the inner wall of the installation shell, a retainer is arranged on the outer side wall of the displacement seat, a limiting frame is embedded in the spiral channel on the outer side wall of the retainer, a wheel set is mounted on the end of the limiting frame, the wheel surface of the wheel set is in abutment with the inner bottom wall of the spiral channel, and a driving motor is drivingly connected with the wheel set on the limiting frame.

3. A groundwater solid-phase sampling device according to claim 2, wherein The buoyancy structure includes a float slidably arranged in the pressure relief channel, a buoyancy chamber is formed in the float, a pushing rod is arranged on the outer side wall of the float, and the pushing structure is drivingly connected with the pushing rod.

4. The groundwater solid sampling device of claim 3, wherein, The pushing structure includes a U-shaped guide structure mounted in the installation shell, a guide channel is formed in the guide structure, a chain link structure is slidably arranged in the guide channel, one side of the chain link structure penetrates through the installation seat and is connected with the pushing rod, and the other side of the chain link structure is connected with the installation seat.

5. The groundwater solid sampling device of claim 1, wherein, The outer arc surface of the split plate and the sealing plate is provided with a temperature insulation plate, and a gap is reserved between the temperature insulation plate and the split plate or the sealing plate.

6. The groundwater solid sampling device of claim 1, wherein, An inlet and outlet chamber in communication with the cooling chamber is formed in the installation seat, an extension tube in communication with the installation seat is arranged on the outer side wall of the coolant storage shell, the extension tube is in communication with the inlet and outlet chamber, and the opening and closing structure is located at the communication position of the extension tube and the inlet and outlet chamber.

7. A groundwater solid-phase sampling device according to claim 6, wherein The opening and closing structure comprises a sealing seat installed at the communication position of the telescopic pipe and the inlet and outlet chamber, a plurality of installation openings are formed in the outer side wall of the sealing seat, a sealing sheet connected with the installation opening is arranged in each installation opening, and a sealing flap is rotatably arranged in the installation opening, the sealing flap is arranged in the sealing seat after penetrating the sealing sheet, a plurality of sealing flaps form a disc-shaped structure after being surrounded in the sealing seat, and the disc-shaped structure is used for closing the communication position of the telescopic pipe and the inlet and outlet chamber; a connecting seat is installed on the outer side wall of the mounting seat, a force arm extending out of the installation opening is arranged on the side wall of the sealing flap; a pushing flow channel is formed in the sealing plate along the extension direction of the sealing plate, a free end of the pushing flow channel extends outwards after penetrating the mounting seat, a floating element is slidably arranged in the pushing flow channel, and a connecting rod is arranged on the outer side wall of the floating element, and the connecting rod is in transmission connection with the corresponding force arm.

8. A groundwater solid-phase sampling device according to claim 7, wherein The outer side wall of the mounting seat is provided with a locking structure for locking the chain link structure.

9. A groundwater solid-phase sampling device according to claim 8, wherein, The locking structure comprises a locking ring channel formed in the outer side wall of the mounting seat, the locking ring channel is in communication with the pushing flow channel, two locking rods respectively located on the two sides of the connecting rod are slidably arranged in the locking ring channel, a reset spring connected with the inner wall of the locking ring channel is arranged on the outer side wall of the locking rod, and when the connecting rod gradually moves to the rear of the pushing flow channel, the connecting rod drives the locking rod to move towards the chain link structure until the locking rod abuts against the chain link structure.

10. A method of sampling using a groundwater solid sampling device according to any one of claims 1 to 9, characterised in that, The method comprises the following steps: S1, the lifting rope is used to lower the installation shell into the sampling area, the displacement seat carrying the unfolded split plate is controlled by the driving structure to extend into the water body through the inlet and outlet until the target sampling depth is reached; S2, the water pressure of the target water layer causes the displacement of the buoyancy structure, and the pushing structure drives the mounting seat and the sealing plate to move downwards, so that the sealing plate is accurately inserted into the installation space between the split plates to form a closed sampling area; S3, the floating element in the sealing plate is used to open the opening and closing structure, the coolant flows into the cooling chamber of the sealing plate from the coolant storage shell, the water sample in the sampling area is quickly frozen to form a solid ice column; S4, the installation shell is lifted to the water surface by the lifting rope, and the stratified sampling is completed.

Images