Groundwater sampling device for boreholes
By using a sealed disc and inlet design in the groundwater sampling device inside the borehole, the problem of surface contamination of samples was solved, enabling sampling below the water surface and ensuring the purity of the samples and the reliability of the experimental data.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN INVESTIGATION & RES INST
- Filing Date
- 2025-05-23
- Publication Date
- 2026-06-16
Smart Images
Figure CN224365804U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of borehole water sampling technology, specifically relating to a groundwater sampling device for boreholes. Background Technology
[0002] During geotechnical engineering investigation, groundwater samples need to be collected to comprehensively assess the impact of groundwater on engineering safety, cost and environment, and to provide a scientific basis for design.
[0003] In existing technologies, groundwater sampling is achieved through ground drilling. Specifically, a borehole is first drilled on the ground, then a sampling tool is placed inside the borehole to allow the tool to be submerged below the water level to complete the sampling. Finally, the sampling tool is retrieved to obtain a groundwater sample.
[0004] The inventors discovered that when the sampling tool passes through the water surface, floating objects (such as mud, oil, decaying leaves, and other impurities) can enter the sampling tool through the opening, causing contamination of the groundwater sample and reducing the reliability of subsequent experimental data. Utility Model Content
[0005] This application provides a borehole groundwater sampling device, which aims to sample groundwater below the water surface, avoid collecting floating objects on the water surface, ensure sampling effect, and improve the reliability of subsequent experimental data.
[0006] To achieve the above objectives, the technical solution adopted in this application is as follows:
[0007] A groundwater sampling device for boreholes is provided, comprising:
[0008] The shell has a hollow interior and an open end to form an inner cavity; the open end of the shell is detachably connected to a top cover for sealing the opening of the inner cavity, and the top cover has a water inlet hole suitable for communicating with the inner cavity.
[0009] A sampling bottle is disposed inside the housing, with its opening facing the opening of the inner cavity;
[0010] A plug rod, detachably connected to the top cover and extending outwards away from the housing; the plug rod has a pre-drilled hole extending through it axially; and
[0011] The control rod is inserted into the reserved hole and has a sealing disc extending radially outward.
[0012] The sealing disc abuts against the top cover, and the control rod is used to rotate the sealing disc to close or avoid the water inlet hole.
[0013] In one possible implementation, the control lever has a limiting disc extending radially outward therefrom, the limiting disc abutting against the lower end face of the insert to restrict the movement of the sealing disc away from the top cover.
[0014] In one possible implementation, the upper end of the control lever extends to the upper side of the insert rod, and the extended end of the control lever has a positioning disc extending radially outward therefrom.
[0015] The positioning plate has an alignment hole that extends through its thickness direction, and the upper end face of the insertion rod has a limiting groove; when the control rod rotates to the point where the sealing plate closes the water inlet, the limiting groove communicates with the alignment hole.
[0016] The positioning plate also has a stop rod adapted to be inserted into the alignment hole; the stop rod is also adapted to be inserted into the alignment hole to limit the rotation of the control rod.
[0017] In one possible implementation, the lower end of the insertion rod has a connecting plate extending radially outward therefrom; the connecting plate has a plurality of mating holes spaced apart circumferentially therefrom, each of the mating holes being through in the vertical direction;
[0018] The top cover has a plurality of docking posts corresponding one-to-one with the plurality of docking holes. Each docking post is adapted to abut against the connecting plate and close the corresponding docking hole, and each docking post has an outwardly extending connecting screw.
[0019] The connecting screw is adapted to pass through the mating hole and extend out, and a connecting nut for abutting against the upper side of the connecting disc is threaded onto the connecting screw.
[0020] In one possible implementation, the housing is provided with at least three centering rods spaced circumferentially thereon, the centering rods comprising:
[0021] A connecting post is fixedly disposed on the outer peripheral surface of the housing, and the connecting post extends radially outward along the housing; a threaded groove is formed on the extended end face of the connecting post; and
[0022] A mating part is disposed on the outside of the connecting post to abut against the inner wall of the drill hole; the mating part is provided with an adjusting screw, and the adjusting screw is threadedly connected to the threaded groove.
[0023] In one possible implementation, the mating member has a concave ball groove on the side facing away from the connecting post, and a ball is embedded in the concave ball groove;
[0024] Some of the balls extend to the outside of the concave ball groove to abut against the inner wall of the borehole.
[0025] In one possible implementation, a flow guide is inserted into the mouth of the sampling bottle; the flow guide has a funnel-shaped structure, and the outer peripheral surface of the flow guide abuts against the inner peripheral surface of the inner cavity;
[0026] The top cover is provided with a retaining ring; when the top cover is connected to the housing, the retaining ring abuts against the flow guide, so that the lower end of the flow guide is inserted into the sampling bottle, and the bottom surface of the sampling bottle abuts against the inner bottom surface of the inner cavity.
[0027] In one possible implementation, the housing has a limiting sleeve inside; the limiting sleeve is made of elastic material and is coaxially arranged with the housing for embedding the sampling bottle;
[0028] When the sampling bottle is inserted into the limiting sleeve, the limiting sleeve undergoes elastic deformation.
[0029] In one possible implementation, the bottom surface of the housing has an external through hole extending along its axial direction, and the bottom surface of the limiting sleeve has an internal through hole communicating with the external through hole; furthermore, a counterweight ring is fixedly provided on the bottom surface of the housing, and the counterweight ring is sleeved around the outer periphery of the external through hole.
[0030] When the sampling bottle is inserted into the limiting sleeve, the bottom surface of the sampling bottle closes the external through hole.
[0031] In one possible implementation, the open end of the housing is integrally connected to a connecting cylinder extending outward along its axial direction, the outer peripheral surface of the connecting cylinder having an external thread structure; the top cover is fitted onto the outer periphery of the connecting cylinder, and the inner peripheral surface of the top cover is provided with an internal thread structure adapted to the external thread structure.
[0032] In this embodiment of the application, the shell can be sealed by placing the sampling bottle into the inner cavity, sealing the opening of the inner cavity with the top cover, and sealing the water inlet with the sealing plate; subsequently, the technical purpose of placing the shell underwater can be achieved by inserting the insertion rod into the drill hole.
[0033] As the casing passes the water surface, its sealed state prevents floating debris from entering the sampling bottle. Once the casing reaches the preset depth, operators can rotate the control lever to simultaneously rotate the sealing disc to avoid the water inlet, allowing groundwater at that depth to enter the casing through the inlet and then collect in the sampling bottle. Finally, the casing is removed, the top cover is removed, and the sampling bottle can be retrieved and the groundwater sample inside recovered.
[0034] The borehole groundwater sampling device provided in this embodiment, compared with the prior art, can sample below the groundwater surface, avoiding sampling floating objects on the water surface, ensuring sampling effect, and improving the reliability of subsequent experimental data. Attached Figure Description
[0035] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0036] Figure 1 A three-dimensional structural schematic diagram of the borehole groundwater sampling device provided in the embodiments of this application;
[0037] Figure 2 for Figure 1 A magnified view of a portion of the middle circle A;
[0038] Figure 3 for Figure 1 Front view;
[0039] Figure 4 For along Figure 3 Cross-sectional view of the middle BB line;
[0040] Figure 5 This is a three-dimensional structural diagram of the sampling bottle and flow guide used in the embodiments of this application from an explosion perspective;
[0041] Figure 6 This is an exploded view of the shell and limiting sleeve used in the embodiments of this application.
[0042] Figure 7 This is a three-dimensional structural diagram of the insert and top cover used in the embodiments of this application from an exploded perspective;
[0043] Figure 8 This is a three-dimensional structural diagram of the top cover used in the embodiments of this application;
[0044] Figure 9 This is a cross-sectional view of the insertion rod used in the embodiments of this application;
[0045] Figure 10 This is an exploded structural diagram of the control rod and stop rod used in the embodiments of this application;
[0046] Figure 11 This is a three-dimensional structural diagram of the shell used in the embodiments of this application;
[0047] Figure 12This is an exploded view of the docking parts and balls used in the embodiments of this application;
[0048] Explanation of reference numerals in the attached drawings: 1. Shell; 11. Inner cavity; 12. Outer through hole; 13. Connecting cylinder; 2. Sampling bottle; 3. Insert rod; 31. Reserved hole; 32. Limiting groove; 33. Connecting plate; 331. Butt hole; 4. Control rod; 41. Sealing plate; 42. Limiting plate; 43. Positioning plate; 431. Alignment hole; 432. Stop rod; 5. Top cover; 51. Water inlet hole; 52. Butt post; 521. Connecting screw; 522. Connecting nut; 53. Stop ring; 6. Centering rod; 61. Connecting post; 611. Threaded groove; 62. Butt joint; 621. Adjusting screw; 622. Concave ball groove; 623. Ball; 7. Flow guide; 8. Limiting sleeve; 81. Inner through hole; 9. Counterweight ring. Detailed Implementation
[0049] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.
[0050] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.
[0051] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 limitations on this application.
[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0053] Please refer to the following: Figures 1 to 12The borehole groundwater sampling device provided in this application will now be described. The borehole groundwater sampling device proposed in this application includes a housing 1, a sampling bottle 2, an insertion rod 3, and a control rod 4.
[0054] The surface of the housing 1 is made of a corrosion-resistant material, and it has a hollow interior with an open end, forming a single-sided open inner cavity 11. In actual use, the housing 1 is used to insert a drill hole, with the open end of the inner cavity 11 facing upwards. A top cover 5 is detachably connected to the open end of the housing 1. When the top cover 5 is connected to the housing 1, the top cover 5 can close the opening of the inner cavity 11 to prevent external liquid from entering the inner cavity 11 through the opening. A water inlet 51 is also provided on the top cover 5. When the top cover 5 is connected to the housing 1, this water inlet 51 communicates with the inner cavity 11, allowing external liquid to enter the inner cavity 11 through the water inlet 51. Based on this, by controlling the opening and closing of the water inlet 51, the timing of liquid entering the inner cavity 11 can be controlled.
[0055] The sampling bottle 2 is placed inside the housing 1, that is, inside the inner cavity 11, and is fixed to the inside of the inner cavity 11 so that the mouth of the sampling bottle 2 faces the opening of the inner cavity 11.
[0056] The insertion rod 3 is detachably connected to the top cover 5 and extends outwards away from the housing 1. Because the insertion rod 3 and the top cover 5 are detachably connected, different lengths of insertion rod 3 can be selected for drilling at different depths to ensure that the housing 1 enters the corresponding depth of the borehole. It should be further noted that, to facilitate control of the insertion depth of the insertion rod 3 into the borehole, such as… Figure 1 As shown, the insert 3 has a support rod extending radially outward, which is used to support the drilled surface to ensure the insertion amount of the insert 3 into the drill hole.
[0057] The insert rod 3 has a pre-drilled hole 31 extending axially along its length. The length of the pre-drilled hole 31 is the same as the length of the insert rod 3, extending from the side of the insert rod 3 facing the top cover 5 to the side facing away from the top cover 5. Since the insert rod 3 is connected to the upper side of the top cover 5, there is a certain gap between the lower end face of the insert rod 3 and the upper end face of the top cover 5, and the lower end of the pre-drilled hole 31 is in an open state. The control rod 4 is inserted into the pre-drilled hole 31, and the lower end of the control rod 4 extends into the space between the insert rod 3 and the top cover 5. The lower end of the control rod 4 has a sealing disc 41 extending radially outward. In actual use, the sealing disc 41 can abut against the top cover 5 to seal the water inlet hole 51. Based on this, by rotating the control rod 4, the sealing disc 41 can be rotated synchronously to a position that closes or avoids the water inlet hole 51, thereby controlling the opening and closing state of the water inlet hole 51.
[0058] In this embodiment of the application, by placing the sampling bottle 2 into the inner cavity 11, and by sealing the opening of the inner cavity 11 with the top cover 5 and sealing the water inlet hole 51 with the sealing plate 41, the inner cavity 11 of the housing 1 can be sealed; subsequently, by inserting the insertion rod 3 into the borehole, the housing 1 can be sent into the borehole and moved to a position below the groundwater level.
[0059] As the housing 1 passes over the water surface, its sealed state prevents floating debris from entering the sampling bottle 2. Once the housing 1 reaches the preset depth, operators can rotate the sealing disc 41 to avoid the inlet hole 51 by rotating the control lever 4. This allows groundwater at that depth to enter the housing 1 through the inlet hole 51 and then collect in the sampling bottle 2. Finally, the housing 1 is removed, and the top cover 5 is taken off to retrieve the sampling bottle 2 and recover the groundwater sample collected inside.
[0060] The borehole groundwater sampling device provided in this embodiment, compared with the prior art, can sample below the groundwater surface, avoiding sampling floating objects on the water surface, ensuring sampling effect, and improving the reliability of subsequent experimental data.
[0061] In some embodiments, such as Figure 4 and Figure 10 As shown, the control lever 4 has a limiting disc 42 extending radially outward. The limiting disc 42 abuts against the lower end face of the insertion rod 3 to restrict the movement of the sealing disc 41 away from the top cover 5, ensuring that the sealing disc 41 rotates with the control lever 4 while abutting against the top cover 5.
[0062] In some embodiments, such as Figure 4 , Figure 9 and Figure 10 As shown, the upper end of the control lever 4 extends to the upper side of the insertion rod 3, and the extended end of the control lever 4 has a positioning disk 43 extending radially outward. In actual use, the rotation of the control lever 4 can be driven and controlled by rotating the positioning disk 43. At the same time, the positioning disk 43, in conjunction with the limiting disk 42, can restrict the movement of the control lever 4 along its own axial direction.
[0063] The positioning plate 43 has a through-hole 431 along its thickness direction, which is located on the outside of the control rod 4. A limiting groove 32 is formed on the upper end face of the insertion rod 3; when the control rod 4 is rotated to the point where the sealing plate 41 closes the water inlet hole 51, the limiting groove 32 communicates with the alignment hole 431.
[0064] The positioning plate 43 also has a stop rod 432 that is suitable for insertion into the alignment hole 431; after the limiting groove 32 is connected to the alignment hole 431, the stop rod 432 is also suitable for insertion into the alignment hole 431 to limit the rotation of the control rod 4, so as to ensure that the sealing plate 41 can be stably positioned in the closed water inlet 51, and to ensure that the shell 1 can be stably sealed when entering and exiting groundwater.
[0065] In some embodiments, such as Figure 7 As shown, the lower end of the insertion rod 3 has a connecting plate 33 extending radially outward; the connecting plate 33 has a plurality of mating holes 331 spaced apart circumferentially thereon, each mating hole 331 being located outside the insertion rod 3 and penetrating in the vertical direction.
[0066] The top cover 5 has multiple docking posts 52 that correspond one-to-one with multiple docking holes 331. Each docking post 52 is adapted to abut against the connecting plate 33 and close the corresponding docking hole 331. Each docking post 52 has an outwardly extending connecting screw 521 that can pass through the corresponding docking hole 331 and extend outward.
[0067] A connecting nut 522 is threaded onto the connecting screw 521. When the connecting screw 521 extends to the upper side of the connecting plate 33, the connecting nut 522 can be tightened to abut against the upper side of the connecting plate 33, thereby cooperating with the mating post 52 to limit the movement of the insertion rod 3 along its own axis.
[0068] In some embodiments, such as Figure 1 , Figure 11 and Figure 12 As shown, the housing 1 is provided with at least three centering rods 6 spaced apart along its circumference; in this embodiment, there are four centering rods 6, which are spaced apart around the central axis of the housing 1, and the included angle between two adjacent centering rods 6 is a right angle.
[0069] In this embodiment, the centering rod 6 includes a connecting post 61 and a docking member 62.
[0070] The connecting post 61 is fixedly disposed on the outer peripheral surface of the housing 1, and the connecting post 61 extends outward along the radial direction of the housing 1. A threaded groove 611 is provided on the extended end face of the connecting post 61, and the threaded groove 611 extends axially along the connecting post 61.
[0071] The mating part 62 is located on the outside of the connecting post 61, specifically on the side facing the opening of the threaded groove 611; after the housing 1 is inserted into the borehole, the mating part 62 is used to abut against the inner wall of the borehole.
[0072] The mating part 62 is provided with an adjusting screw 621, and the adjusting screw 621 is threadedly connected to the threaded groove 611, so that the distance between the mating part 62 and the outer side of the housing 1 can be adjusted by manually rotating the mating part 62, thereby adapting to different sizes of drill holes.
[0073] In some embodiments, such as Figure 12 As shown, the side of the docking member 62 facing away from the connecting post 61 has a concave ball groove 622, and a ball 623 is embedded in the concave ball groove 622.
[0074] After the ball bearing 623 and the mating part 62 are combined, part of the ball bearing 623 extends to the outside of the concave ball groove 622 so that the protruding surface of the ball bearing 623 can abut against the inner wall of the drill hole, so as to ensure that the mating part 62 can roll smoothly along the inner wall of the drill hole.
[0075] In some embodiments, such as Figure 4 and Figure 5 As shown, a flow guide 7 is inserted into the mouth of the sampling bottle 2; the flow guide 7 adopts a funnel-shaped structure that is wider at the top and narrower at the bottom to achieve its flow guiding purpose. The outer peripheral surface of the flow guide 7 abuts against the inner peripheral surface of the inner cavity 11 to prevent the water flowing into the inner cavity 11 from remaining in the inner cavity 11 and being unable to enter the sampling bottle 2.
[0076] The top cover 5 is provided with a downwardly extending baffle ring 53; when the top cover 5 is connected to the housing 1, the baffle ring 53 is embedded in the inner cavity 11 and abuts against the guide member 7, so that the lower end of the guide member 7 is kept inserted into the sampling bottle 2, and the bottom surface of the sampling bottle 2 abuts against the inner bottom surface of the inner cavity 11, ensuring that each component in the inner cavity 11 is in a stable state.
[0077] In some embodiments, such as Figure 4 As shown, the housing 1 has a limiting sleeve 8 inside.
[0078] To secure the housing 1 and the limiting sleeve 8, the outer circumferential surface of the limiting sleeve 8 has multiple connecting rings. These connecting rings are spaced apart along the axial direction of the limiting sleeve 8, and each connecting ring is coaxially fitted onto the outer circumference of the limiting sleeve 8. Correspondingly, the inner circumferential wall of the inner cavity 11 has multiple annular grooves spaced apart along the vertical direction. The multiple connecting rings are correspondingly embedded in the multiple annular grooves to ensure that the limiting sleeve 8 and the housing 1 are coaxially arranged and to restrict the movement of the limiting sleeve 8 relative to the housing 1 along the axial direction of the housing 1.
[0079] The limiting sleeve 8 is made of elastic material for the sampling bottle 2 to be inserted into; and when the sampling bottle 2 is inserted into the limiting sleeve 8, the limiting sleeve 8 undergoes elastic deformation to provide a force to the sampling bottle 2 and prevent the sampling bottle 2 from moving relative to the housing 1.
[0080] In some embodiments, such as Figure 4 and Figure 6As shown, the bottom surface of the housing 1 has an external through hole 12 extending along its axial direction, and the through hole 12 communicates with the inner cavity 11; and the bottom surface of the limiting sleeve 8 has an internal through hole 81 communicating with the external through hole 12. When the sampling bottle 2 is placed into the housing 1 and the sampling bottle 2 is limited by the limiting sleeve 8, the lower end face of the sampling bottle 2 closes the internal through hole 81 to prevent external liquid from entering the inner cavity 11 through the interconnected internal through hole 81 and external through hole 12.
[0081] Based on the foregoing, a counterweight ring 9 is also fixedly provided on the bottom surface of the housing 1. This counterweight ring 9 is sleeved on the outer periphery of the outer through hole 12 to avoid blocking the outer through hole 12.
[0082] By adopting the above technical solution, when it is necessary to remove the sampling bottle 2, a thin straight rod can be inserted into the interconnected inner through hole 81 and outer through hole 12, and the sampling bottle 2 can be pushed to the opening of the inner cavity 11, so as to remove it manually and avoid liquid overflowing from the bottle mouth.
[0083] In some embodiments, such as Figure 4 , Figure 8 and Figure 11 As shown, the open end of the housing 1 is integrally connected to a connecting cylinder 13 extending outward along its axial direction, and the outer circumferential surface of the connecting cylinder 13 has an external thread structure; based on this, the top cover 5 is sleeved on the outer circumference of the connecting cylinder 13, and the inner circumferential surface of the top cover 5 is provided with an internal thread structure that is compatible with the external thread structure.
[0084] When it is necessary to combine the housing 1 and the top cover 5, the top cover 5 can be fitted onto the outer periphery of the connecting cylinder 13. Then, by rotating the top cover 5, the internal thread structure and the external thread structure can be engaged. The threaded connection between the housing 1 and the top cover 5 can be achieved by using the connecting cylinder 13 as an intermediate component.
[0085] The above content is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A groundwater sampling device for boreholes, characterized in that, include: The shell has a hollow interior and an open end to form an inner cavity; the open end of the shell is detachably connected to a top cover for sealing the opening of the inner cavity, and the top cover has a water inlet hole suitable for communicating with the inner cavity. A sampling bottle is disposed inside the housing, with its opening facing the opening of the inner cavity; A plug rod, detachably connected to the top cover and extending outwards away from the housing; the plug rod has a pre-drilled hole extending through it axially; and The control rod is inserted into the reserved hole and has a sealing disc extending radially outward. The sealing disc abuts against the top cover, and the control rod is used to rotate the sealing disc to close or avoid the water inlet hole.
2. The borehole groundwater sampling device as described in claim 1, characterized in that, The control rod has a limiting disc extending radially outward therefrom, the limiting disc abutting against the lower end face of the insertion rod to restrict the sealing disc from moving away from the top cover.
3. The borehole groundwater sampling device as described in claim 1 or 2, characterized in that, The upper end of the control rod extends to the upper side of the insertion rod, and the extended end of the control rod has a positioning disc extending radially outward therefrom; The positioning plate has an alignment hole that extends through its thickness direction, and the upper end face of the insertion rod has a limiting groove; when the control rod rotates to the point where the sealing plate closes the water inlet, the limiting groove communicates with the alignment hole. The positioning plate also has a stop rod adapted to be inserted into the alignment hole; the stop rod is also adapted to be inserted into the alignment hole to limit the rotation of the control rod.
4. The borehole groundwater sampling device as described in claim 1, characterized in that, The lower end of the insertion rod has a connecting plate extending radially outward; the connecting plate has a plurality of mating holes spaced apart circumferentially, each of the mating holes being through in the vertical direction; The top cover has a plurality of docking posts corresponding one-to-one with the plurality of docking holes. Each docking post is adapted to abut against the connecting plate and close the corresponding docking hole, and each docking post has an outwardly extending connecting screw. The connecting screw is adapted to pass through the mating hole and extend out, and a connecting nut for abutting against the upper side of the connecting disc is threaded onto the connecting screw.
5. The borehole groundwater sampling device as described in claim 1, characterized in that, The housing is provided with at least three centering rods spaced apart along its circumference, the centering rods comprising: A connecting post is fixedly disposed on the outer peripheral surface of the housing, and the connecting post extends radially outward along the housing; a threaded groove is formed on the extended end face of the connecting post; and A mating part is disposed on the outside of the connecting post to abut against the inner wall of the drill hole; the mating part is provided with an adjusting screw, and the adjusting screw is threadedly connected to the threaded groove.
6. The borehole groundwater sampling device as described in claim 5, characterized in that, The mating part has a concave ball groove on the side facing away from the connecting post, and a ball is embedded in the concave ball groove; Some of the balls extend to the outside of the concave ball groove to abut against the inner wall of the borehole.
7. The borehole groundwater sampling device as described in claim 1, characterized in that, A flow guide is inserted into the mouth of the sampling bottle; the flow guide has a funnel-shaped structure, and the outer peripheral surface of the flow guide abuts against the inner peripheral surface of the inner cavity. The top cover is provided with a retaining ring; when the top cover is connected to the housing, the retaining ring abuts against the flow guide, so that the lower end of the flow guide is inserted into the sampling bottle, and the bottom surface of the sampling bottle abuts against the inner bottom surface of the inner cavity.
8. The borehole groundwater sampling device as described in claim 1, characterized in that, The housing has a limiting sleeve inside; the limiting sleeve is made of elastic material and is coaxially arranged with the housing for the sampling bottle to be inserted. When the sampling bottle is inserted into the limiting sleeve, the limiting sleeve undergoes elastic deformation.
9. The borehole groundwater sampling device as described in claim 8, characterized in that, The bottom surface of the housing has an external through hole extending along its axial direction, and the bottom surface of the limiting sleeve has an internal through hole communicating with the external through hole; furthermore, a counterweight ring is fixedly provided on the bottom surface of the housing, and the counterweight ring is sleeved on the outer periphery of the external through hole. When the sampling bottle is inserted into the limiting sleeve, the bottom surface of the sampling bottle closes the external through hole.
10. The borehole groundwater sampling device as described in claim 1, characterized in that, The shell has an integrally connected connecting cylinder extending outward along its axial direction at its open end, and the outer circumferential surface of the connecting cylinder has an external thread structure; the top cover is fitted onto the outer circumference of the connecting cylinder, and the inner circumferential surface of the top cover is provided with an internal thread structure that is compatible with the external thread structure.