Underground water sampling device capable of preventing cross contamination

Abstract

The invention discloses an underground water sampling device capable of preventing cross contamination. The underground water sampling device comprises a cable type lifting machine; the wire wheel seat is driven by a cable type lifting machine to move up and down, and a carrying table is fixed at the bottom of the wire wheel seat; the motor is fixed on the top surface of the carrying table; and the stratified sampling mechanism is fixed on the bottom surface of the carrying table, is driven by a motor, and can perform synchronous sampling operation on a plurality of sections of underground water. According to the device, through layered synchronous sampling, dynamic sealing control and modular residue prevention design, the goals of high fidelity and low pollution of underground water sampling are achieved, and the device is particularly suitable for application scenes such as deeper underground water monitoring sites and the like which have strict requirements on data precision.

Description

Technical Field

[0001] The present invention specifically relates to the technical field of groundwater sampling, and more specifically, to a groundwater sampling device for preventing cross-contamination. Background Art

[0002] Groundwater sampling is a key link in environmental monitoring, resource assessment, and pollution control. The core issue lies in how to obtain high-fidelity water samples from complex geological environments while avoiding cross-contamination of different strata or historical samples. Due to the following design limitations and operational deficiencies of traditional technologies, it is difficult to meet the increasingly stringent monitoring requirements:

[0003] 1. Traditionally, a bailer or a submersible pump is used to collect water samples from different strata by lowering the well multiple times. During the lifting process, the water in the wellbore is mixed, resulting in vertical hydraulic crosstalk.

[0004] 2. When locally sampling the water body within a specified layer area, only the water body within a very small range around the pumping hole can be obtained. Due to the uneven distribution of substances in the water body, it is difficult to reflect the true substance content of the water layer containing the water, affecting the determination of the water health of the water layer area. Summary of the Invention

[0005] Therefore, the present invention proposes a groundwater sampling device for preventing cross-contamination to solve the problems raised in the above background art.

[0006] To achieve the above object, the present invention provides the following technical solutions: A groundwater sampling device for preventing cross-contamination, comprising:

[0007] A cable hoist;

[0008] A wire reel seat, which is driven by the cable hoist to move up and down. A carrying platform is fixed to the bottom of the wire reel seat.

[0009] A motor, which is fixed on the top surface of the carrying platform.

[0010] And a layered sampling mechanism, which is fixed to the bottom surface of the carrying platform. The layered sampling mechanism is driven by the motor and can perform synchronous sampling operations on multiple sections of groundwater.

[0011] Further, preferably, the layered sampling mechanism is composed of a bearing cylinder, a plurality of counterweight rings, and a small-flow sampling mechanism. Among them, the plurality of small-flow sampling mechanisms are arranged at equal intervals along the axial direction of the bearing cylinder, and the bearing cylinder is detachably connected to the small-flow sampling mechanism located above and between every two adjacent small-flow sampling mechanisms by counterweight rings.

[0012] Further, preferably, the small-flow sampling mechanism includes:

[0013] A sieve shell, with shaft seals installed at both its upper and lower ports in a sealed manner;

[0014] A rotating shaft, rotatably installed between the two shaft seals;

[0015] A linkage gear, rotatably installed on the upper shaft seal, and the linkage gear meshes with a toothed ring fixed on the side wall of the rotating shaft;

[0016] A rotating ring, whose outer wall fits against the inner wall of the sieve shell. Tooth patterns are provided on the inner wall of the rotating ring, which meshes with the linkage gear;

[0017] A sealing and control cylinder, arranged inside the sieve shell and fixedly connected to the rotating ring;

[0018] And an inner cylinder, arranged inside the sealing and control cylinder, fixedly connected to the rotating shaft by a plurality of spacer rings, and a plurality of fine-flow introduction components driven to open and close by the sealing and control cylinder are installed on the side wall of the inner cylinder.

[0019] Further, preferably, a plurality of notches are provided on the side wall of the sieve shell, and a filter screen is installed in each notch.

[0020] Further, preferably, a sampling cavity is formed between every two spacer rings, the inner cylinder and the rotating shaft, and each sampling cavity is communicated with its corresponding fine-flow introduction component.

[0021] Further, preferably, key grooves are provided on the upper and lower end faces of each rotating shaft, and adjacent rotating shafts are clamped by flat keys.

[0022] Further, preferably, the fine-flow introduction component includes:

[0023] A water intake seat, fixedly embedded in the side wall of the inner cylinder. A sealing hole is provided on the left end face of the water intake seat, and a plurality of drainage channels communicating between the sealing hole and the sampling cavity are provided inside the water intake seat;

[0024] A spring seat, fixed on the right end face of the water intake seat;

[0025] A sliding column, one end of which is fixedly connected to a ball seal fittingly sliding in the sealing hole, and the other end of the sliding column penetrates into the spring seat;

[0026] And a spring, arranged inside the spring seat, with both ends of the spring connected to the sliding column and the spring seat respectively.

[0027] Further, preferably, the sealing and control cylinder consists of a ring seat and an outer cylinder. Among them, the top of the ring seat is fixedly connected to the rotating ring, the bottom end of the ring seat is fixedly connected to the outer cylinder, and the outer cylinder fits against the inner cylinder;

[0028] A plurality of through openings are provided on the side wall of the outer cylinder body. A press strip with a rounded corner is fixedly connected in each through opening, and the press strip is adapted to a sliding spherical seal and can push the spherical seal to the right side of the inlet end of the drainage channel, so that the drainage channel is in a flowing state.

[0029] Further, preferably, a convex ring is fixed on the inner wall of the sieve housing, and the convex ring is slidably connected to the annular groove on the outer wall of the rotating ring in an adapted manner.

[0030] Further, preferably, a plurality of arc-shaped openings are also provided on the side wall of the outer cylinder body. A collecting pipe is arranged in each arc-shaped opening. One end of each collecting pipe penetrates into the corresponding sampling cavity, and the other end of each collecting pipe passes through the outer wall of the sieve housing and extends out, and then is blocked by a plug.

[0031] The present invention adopts the above technologies and has the following beneficial effects compared with the existing technologies:

[0032] 1. In the device of the present invention, by driving each small-flow sampling mechanism by a motor, synchronous sampling of water samples at different depths is realized. Sampling of multiple groundwater layers can be completed in a single well lowering, avoiding the interlayer hydraulic cross-talk caused by traditional single-point multiple liftings. Moreover, each small-flow sampling mechanism performs re-stratified sampling for the groundwater layer area corresponding to it, so as to improve the accuracy of material analysis of groundwater.

[0033] 2. When the device of the present invention samples, the motor drives each rotating shaft to rotate clockwise. During this process, the toothed ring on the rotating shaft drives the rotating ring to rotate counterclockwise through the linkage gear. At the same time, the inner cylinder rotates synchronously with the rotating shaft, and further drives the inner cylinder and the outer cylinder to rotate clockwise and counterclockwise respectively, so that the fine-flow introduction component is quickly opened, that is, the press strip of the outer cylinder pushes the spherical seal to move rightward through the rounded corner design, compresses the spring, opens the drainage channel, and the groundwater pre-filtered by the filter screen enters the sampling cavity to complete the sampling;

[0034] After sampling, the spring resets and pushes the spherical seal to move leftward to close the drainage channel, completely cutting off the flow channel and avoiding the retention of residual liquid. Description of the Drawings

[0035] Figure 1 It is a structural schematic diagram of a groundwater sampling device for preventing cross-contamination;

[0036] Figure 2 It is a structural schematic diagram of a layered sampling mechanism in a groundwater sampling device for preventing cross-contamination;

[0037] Figure 3 It is a partial cross-sectional view of a small-flow sampling mechanism in a groundwater sampling device for preventing cross-contamination;

[0038] Figure 4Partial perspective cross-sectional view of the small flow sampling mechanism in a groundwater sampling device for preventing cross-contamination;

[0039] Figure 5 is Figure 3 An enlarged schematic view of part A in

[0040] In the figure: 1. Cable hoist; 2. Cable wheel seat; 3. Mounting platform; 4. Motor; 5. Stratified sampling mechanism; 6. Bearing cylinder; 7. Counterweight ring; 8. Small flow sampling mechanism; 9. Filter screen; 801. Rotating shaft; 802. Sieve shell; 803. Outer cylinder; 804. Spacer ring; 805. Ball seal; 806. Water intake seat; 807. Drainage channel; 808. Spring seat; 809. Spring; 810. Slide post; 811. Pressure strip; 812. Through port; 813. Linkage gear; 814. Shaft seal seat; 815. Rotating ring; 816. Inner cylinder; 817. Ring seat. Detailed implementation mode

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0042] Embodiment: Please refer to the attached Figures 1-5 , the present invention provides a technical solution: A groundwater sampling device for preventing cross-contamination, which includes:

[0043] Cable hoist 1;

[0044] Cable wheel seat 2, which is driven by cable hoist 1 to move up and down, and a mounting platform 3 is fixed at the bottom of cable wheel seat 2;

[0045] Motor 4, which is fixed on the top surface of mounting platform 3;

[0046] And a stratified sampling mechanism 5, which is fixed on the bottom surface of mounting platform 3, and the stratified sampling mechanism 5 is driven by motor 4 and can perform synchronous sampling operations on multiple sections of groundwater.

[0047] In this embodiment, the stratified sampling mechanism 5 is composed of a bearing cylinder 6, multiple counterweight rings 7, and a small flow sampling mechanism 8. Among them, multiple small flow sampling mechanisms 8 are arranged at equal intervals along the axial direction of the bearing cylinder 6, and the bearing cylinder 6 and the small flow sampling mechanism 8 located above it, as well as between every two adjacent small flow sampling mechanisms 8, are detachably connected by counterweight rings 7;

[0048] Specifically, multiple small-flow sampling mechanisms are evenly distributed at equal intervals along the axial direction of the bearing cylinder, such that each mechanism corresponds to a specific aquifer underground. By driving each small-flow sampling mechanism with a motor, synchronous sampling of water samples at different depths can be achieved. Sampling of 3 - 5 groundwater levels can be completed in a single well lowering (depending on the number of small-flow sampling mechanisms), avoiding the interlayer hydraulic cross-talk caused by traditional single-point multiple liftings.

[0049] In this embodiment, the small-flow sampling mechanism 8 includes:

[0050] A sieve shell 802, with shaft seals 814 sealed and installed at both its upper and lower ports;

[0051] A rotating shaft 801, which is rotatably installed between two shaft seals 814;

[0052] A linkage gear 813, which is rotatably installed on the upper shaft seal 814, and the linkage gear 813 meshes with a toothed ring fixed on the side wall of the rotating shaft 801;

[0053] A rotating ring 815, whose outer wall fits against the inner wall of the sieve shell 802. Tooth patterns are provided on the inner wall of the rotating ring 815, and it meshes with the linkage gear 813;

[0054] A sealing control cylinder, which is arranged inside the sieve shell 802 and is fixedly connected to the rotating ring 815;

[0055] And an inner cylinder 816, which is arranged inside the sealing control cylinder and is fixedly connected to the rotating shaft 801 through a plurality of spacer rings 804. A plurality of fine-flow introduction components that are driven to open and close by the sealing control cylinder are installed on the side wall of the inner cylinder 816.

[0056] In this embodiment, a plurality of notches are provided on the side wall of the sieve shell 802, and a filter screen 9 is installed in each notch.

[0057] In this embodiment, a sampling cavity is formed between every two spacer rings 804, the inner cylinder 816, and the rotating shaft 801. Each sampling cavity is communicated with its corresponding fine-flow introduction component;

[0058] Specifically, each sampling cavity is separated by a spacer ring 804. During sampling, only the water body of the target layer enters through the corresponding drainage channel 807, completely avoiding interlayer water mixing.

[0059] In this embodiment, key grooves are provided on the upper and lower end faces of each rotating shaft 801, and adjacent rotating shafts 801 are clamped with each other through flat keys.

[0060] In this embodiment, the fine-flow introduction component includes:

[0061] The water intake seat 806 is fixedly embedded on the side wall of the inner cylinder 816. A sealing hole is provided at the left end face of the water intake seat 806, and a plurality of drainage channels 807 communicating between the sealing hole and the sampling cavity are provided inside the water intake seat 806;

[0062] The spring seat 808 is fixed on the right end face of the water intake seat 806;

[0063] One end of the sliding column 810 is fixedly connected to the ball seal 805 that fits and slides in the sealing hole, and the other end of the sliding column 810 penetrates into the spring seat 808;

[0064] It should be added that a limiting ring is fixed on one end of the sliding column 810 that penetrates into the spring seat 808 to prevent it from disengaging from the sliding hole;

[0065] And the spring 809 is arranged inside the spring seat 808, and both ends of the spring 809 are respectively connected to the sliding column 810 and the spring seat 808;

[0066] During sampling, the motor drives each rotating shaft to rotate clockwise. During this process, the toothed ring on the rotating shaft drives the rotating ring to rotate counterclockwise through the linkage gear 813. At the same time, the inner cylinder rotates synchronously with the rotating shaft, thereby driving the inner cylinder and the outer cylinder to rotate clockwise and counterclockwise respectively, so that the fine flow introduction component is quickly opened, that is, the pressing strip 811 of the outer cylinder 803 pushes the ball seal 805 to move to the right through the rounded corner design, compresses the spring 809, opens the drainage channel 807, and the groundwater pre-filtered by the filter screen 9 enters the sampling cavity to complete the collection;

[0067] After sampling, the spring 809 resets and pushes the ball seal 805 to move to the left to close the drainage channel 807, completely cutting off the flow channel to prevent residual liquid from staying;

[0068] Moreover, it should also be noted that low-speed sampling avoids disturbing the aquifer due to too fast suction and prevents fine particles from surging up and polluting other area samples.

[0069] In this embodiment, the sealing cylinder is composed of a ring seat 817 and an outer cylinder 803. Among them, the top of the ring seat 817 is fixedly connected to the rotating ring 815, the bottom end of the ring seat 817 is fixedly connected to the outer cylinder 803, and the outer cylinder 803 is in contact with the inner cylinder 816;

[0070] Specifically, the bottom of the outer cylinder 803 is in sealed rotational connection with the shaft seal seat below, and a sealed relationship is formed between the outer cylinder 803 and the inner cylinder 816 to ensure that parts such as the rotating shaft, linkage gear, and rotating ring are not affected by moisture and rust, affecting subsequent continued use;

[0071] A plurality of through ports 812 are provided on the side wall of the outer cylinder 803. A press strip 811 with a rounded corner is fixedly connected in each through port 812. The press strip 811 is adapted to the sliding spherical seal 805 and can push the spherical seal 805 to the right side of the inlet end of the drainage channel 807, so that the drainage channel 807 is in a flowing state.

[0072] In this embodiment, a convex ring is fixed on the inner wall of the sieve housing 802, and the convex ring is slidably engaged with the annular groove on the outer wall of the rotating ring 815. On the one hand, it can be used for limiting, and on the other hand, it blocks the infiltration of external water.

[0073] In this embodiment, a plurality of arc-shaped ports are further provided on the side wall of the outer cylinder 803. A collecting pipe is arranged in each arc-shaped port. One end of each collecting pipe penetrates into the sampling cavity corresponding to it, and the other end of each collecting pipe passes through the outer wall of the sieve housing 802 and extends out, and then is blocked by a plug.

[0074] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A groundwater sampling device for preventing cross - contamination, characterized in that, It includes: A cable type hoister (1); A wire wheel seat (2), which is driven by the cable type hoister (1) to move up and down, and a carrying platform (3) is fixed at the bottom of the wire wheel seat (2); A motor (4), which is fixed on the top surface of the carrying platform (3); And a layered sampling mechanism (5), which is fixed on the bottom surface of the carrying platform (3), and the layered sampling mechanism (5) is driven by the motor (4) and can perform synchronous sampling operations on multiple sections of groundwater.

2. The groundwater sampling device for preventing cross - contamination according to claim 1, wherein: The layered sampling mechanism (5) is composed of a bearing cylinder (6), a plurality of counterweight rings (7), and a small flow sampling mechanism (8). Among them, the plurality of small flow sampling mechanisms (8) are arranged at equal intervals along the axial direction of the bearing cylinder (6), and the bearing cylinder (6) is detachably connected to the small flow sampling mechanism (8) located above and between every two adjacent small flow sampling mechanisms (8) by counterweight rings (7).

3. The groundwater sampling device for preventing cross-contamination according to claim 2, wherein: The small flow sampling mechanism (8) includes: A sieve shell (802), and shaft seals (814) are hermetically installed at both the upper and lower ports thereof; A rotating shaft (801), which is rotatably installed between the two shaft seals (814); A linkage gear (813), which is rotatably installed on the shaft seal (814) located above, and the linkage gear (813) meshes with a toothed ring fixed on the side wall of the rotating shaft (801); A rotating ring (815), whose outer wall fits with the inner wall of the sieve shell (802), and tooth patterns are arranged on the inner wall of the rotating ring (815) and mesh with the linkage gear (813); A sealing control cylinder body, which is arranged in the sieve shell (802) and is fixedly connected to the rotating ring (815); And an inner cylinder body (816), which is arranged in the sealing control cylinder body and is fixedly connected to the rotating shaft (801) by a plurality of spacer rings (804), and a plurality of fine flow introduction components driven by the sealing control cylinder body to open and close are installed on the side wall of the inner cylinder body (816).

4. The groundwater sampling device for preventing cross - contamination according to claim 3, characterized in that: A plurality of notches are arranged on the side wall of the sieve shell (802), and a filter screen (9) is installed in each notch; 5. The groundwater sampling device for preventing cross - contamination according to claim 3, wherein: A sampling cavity is formed between every two spacer rings (804) and the inner cylinder body (816) and the rotating shaft (801), and each sampling cavity is communicated with a corresponding fine flow introduction component; 6. The groundwater sampling device for preventing cross - contamination according to claim 5, characterized in that: Key grooves are arranged on the upper and lower end faces of each rotating shaft (801), and every two adjacent rotating shafts (801) are clamped by a flat key; 7. A groundwater sampling device for preventing cross - contamination according to claim 5, characterized in that: The fine flow introduction component includes: A water intake seat (806), which is fixedly embedded on the side wall of the inner cylinder body (816), a sealing hole is arranged on the left end face of the water intake seat (806), and a plurality of drainage channels (807) communicating the sealing hole with the sampling cavity are arranged in the water intake seat (806); A spring seat (808), which is fixed on the right end face of the water intake seat (806); A sliding column (810), one end of which is fixedly connected to a ball seal (805) slidably fitted in the sealing hole, and the other end of the sliding column (810) penetrates into the spring seat (808); And a spring (809), which is arranged in the spring seat (808), and both ends of the spring (809) are respectively connected to the sliding column (810) and the spring seat (808).

8. The groundwater sampling device for preventing cross - contamination according to claim 7, wherein: The sealed cylinder body is composed of a ring base (817) and an outer cylinder body (803). Among them, the top of the ring base (817) is fixedly connected to the rotating ring (815), the bottom end of the ring base (817) is fixedly connected to the outer cylinder body (803), and the outer cylinder body (803) is in contact with the inner cylinder body (816). A plurality of through openings (812) are provided on the side wall of the outer cylinder body (803). A pressure strip (811) with a rounded corner is fixedly connected in each through opening (812), and the pressure strip (811) is adapted to the sliding spherical seal (805) and can push the spherical seal (805) to the right side of the inlet end of the drainage channel (807), so that the drainage channel (807) is in a flowing state.

9. The groundwater sampling device for preventing cross - contamination according to claim 8, wherein: A convex ring is fixed on the inner wall of the sieve shell (802), and the convex ring is slidably connected to the annular groove on the outer wall of the rotating ring (815).

10. The groundwater sampling device for preventing cross - contamination according to claim 8, wherein: A plurality of arc openings are also provided on the side wall of the outer cylinder body (803). A collecting pipe is arranged in each arc opening. One end of each collecting pipe penetrates into the corresponding sampling cavity, and the other end of each collecting pipe passes through the outer wall of the sieve shell (802) and extends out, and then is blocked with a plug.

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