Anti-pollution underground water stratified sampling device

Abstract

The invention relates to the technical field of underground water collection, and discloses an anti-pollution underground water stratified sampling device which comprises a sampling pump and a stratified pipe, the stratified pipe comprises a first pipe end on the head portion, a second pipe end on the tail portion and a plurality of pipe sections in the middle, and sealing covers are fixed to the first pipe end, the second pipe end and the end portions of the pipe sections. A connecting part is mounted between every two adjacent sealing covers; a segmentation opening is formed in the middle of the pipe section, the interior of the pipe section is divided into an upper cavity and a lower cavity through the segmentation opening, pressure collecting parts driven to move under air pressure are installed in the upper cavity and the lower cavity, and the pressure collecting parts move towards the interior of the lower cavity to enable water to enter the lower cavity through negative pressure. When water samples are collected, each layer of water sample is physically isolated by the independent cavity structure, the water samples with relative depths are extracted more accurately, and various water samples with different depths are collected at one time under the action of the air pressure of the sampling pump, so that excessive disturbance to the water body is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of groundwater collection, in particular to a pollution-proof groundwater stratified sampling device. Background Art

[0002] With the acceleration of industrialization and urbanization, accurate monitoring of groundwater quality parameters at different depths has become crucial for environmental assessment and remediation. During the collection process, groundwater samples must be obtained from specific depths to ensure they accurately reflect the water quality at the target depth, avoiding data inaccuracy due to mixing of different water layers or contaminants.

[0003] Currently, conventional sampling devices, such as bailer tubes, can easily disturb different water layers during repeated sampling, causing contaminants to penetrate between aquifers. Mixed water samples can dilute contamination concentrations and distort test results. During groundwater collection, flaws in the sampler's structural design can introduce contamination into the water sample, leading to low organic matter detection values. Furthermore, residual flushing fluid and external contaminants carried by the equipment during sampling also exacerbate the risk of sample contamination.

[0004] While existing integrated monitoring wells reduce the number of drill holes, the spacing between sampling tubes is fixed and cannot be flexibly adjusted to the actual water depth, limiting sampling accuracy. Furthermore, the sampling tubes are difficult to adapt to the underlying stratum structure, and the gas released from the tubes disturbs the water, disrupting stratification.

[0005] Most collection devices lack a convenient cleaning design, and residual contaminants can easily cross-contaminate subsequent samples when reused. To address these issues, a stratified sampling device that is both contamination-resistant, adjustable, portable, and efficient is urgently needed. Summary of the Invention

[0006] The purpose of the present invention is to provide a pollution-proof groundwater stratified sampling device to solve the problems raised in the above background technology.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a pollution-proof groundwater stratified sampling device, comprising a sampling pump and a stratified pipe, wherein the stratified pipe comprises a pipe end 1 at the head, a pipe end 2 at the tail, and a plurality of pipe segments in the middle portion, wherein the pipe end 1, the pipe end 2, and the ends of the pipe segments are all fixed with sealing covers, and connecting portions are installed between the sealing covers and adjacent sealing covers;

[0008] A segmented opening is provided in the middle portion of the pipe section, and the interior of the pipe section is divided into an upper chamber and a lower chamber through the segmented opening. Pressure collecting parts driven to move under air pressure are installed in the upper chamber and the lower chamber, and the pressure collecting parts move into the lower chamber to cause negative pressure to enter water.

[0009] Furthermore, a threaded pipe end 1 is fixed to the outside of the sealing cover, and the connecting part includes threaded pipe ends 2 at both ends and an intermediate pipe in the middle. The threaded pipe ends 2 at both ends are integrated with the intermediate pipe, and the threaded pipe ends 2 are threadedly connected to the threaded pipe end 1 to connect the interior of the layered pipe.

[0010] Furthermore, the inner walls of the upper chamber and the lower chamber near the segmented opening are respectively provided with a circle of support ring 1 and support ring 2, the side of the support ring 1 facing the segmented opening is affixed with a closing cover, the side of the support ring 2 facing the segmented opening is fixed with a closing ring, and the lower end of the closing cover has an elastic support portion for supporting it;

[0011] The pressure collecting portion includes a pressure tube that passes through the closing cover, with an upper sealing plate and a lower sealing plate fixed at both ends. The upper sealing plate and the lower sealing plate are respectively located in the upper chamber and the lower chamber. A push ring for pushing the closing cover is also fixed to the outer wall of the pressure tube. The pressure tube has a pneumatic transmission part inside, which is used to close the pressure tube and open it when a certain pressure is reached.

[0012] When resetting, the lower sealing plate is sealed against the lower ends of the second support ring; when collecting water, the upper sealing plate is sealed against the upper end of the first support ring, and the push ring pushes the closing cover to seal against the closing ring.

[0013] Furthermore, the outer sides of the upper sealing plate and the lower sealing plate are respectively sealed and fitted with the inner walls of the upper chamber and the lower chamber and are movable.

[0014] Furthermore, the pneumatic transmission part includes a ring fixed inside the pressure tube, a shaft rod is provided inside the ring one, and cover plates are fixed at both ends of the shaft rod, wherein the cover plate at the lower end is sealed and fitted with the lower end of the ring, and a spring body is provided between the cover plate at the upper end and the ring one, and the spring body is in a compressed state. When the pressure increases, the spring body will be further compressed to put the pneumatic transmission part in a connected state.

[0015] Furthermore, the plurality of pipe sections all have spring bodies and are distributed from top to bottom, and the spring bodies distributed from top to bottom have the same spring coefficients.

[0016] Furthermore, the elastic support portion includes a support shaft fixed on the outside of the pipe section, the support shaft is outer-circuited with a support spring, and the outer side of the closing cover is integrally provided with an extension end, the extension end is sleeved with the support shaft and abuts against the support spring.

[0017] Furthermore, a buckle is fixed on the outside of the tube section, and the buckle has a spring inside and a clamping shaft extending inward and outward. The outer end of the clamping shaft is set with an upward inclined surface. When the extended end moves downward, the extended end is buckled to seal the lower chamber.

[0018] Furthermore, an air tube is fixed between the sampling pump and the first tube end, and a pull rope is connected to the outside of the first tube end.

[0019] Furthermore, an air pressure sensor is provided inside the second tube end, a controller is installed in the sampling pump, and both the air pressure sensor and the sampling pump are electrically connected to the controller.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. When collecting water samples, the independent chamber structure physically isolates each layer of water samples, making the extraction of water samples at relative depths more accurate. In addition, the air pressure of the sampling pump can collect various water samples at different depths at one time to avoid excessive disturbance to the water body.

[0022] 2. The pipe sections can be freely increased or decreased, the connecting parts can be replaced with different lengths, the depth and number of the pipe sections can be adjusted, and flexible depth operation can be achieved.

[0023] 3. Each pipe section collects water samples through the pressure collection part. After collection, only the lower chamber contains water samples, and the upper chamber is closed by the upper sealing plate, thus preventing excess water samples from moving upward. Only the water samples collected in the lower chamber exist, preventing the water samples from mixing due to operation.

[0024] 4. The pipe sections can be separated and disassembled and stored separately, without the need for additional filling of water samples, which improves portability and enables cleaning without dead ends. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the layered tube structure of the present invention;

[0028] Figure 3 This is a schematic diagram of a half-section structure of a layered tube according to the present invention;

[0029] Figure 4 This is a schematic diagram of the exploded structure of the sealing cover and the connecting end of the present invention;

[0030] Figure 5 It is a schematic diagram of the internal structure of two adjacent pipe sections of the present invention;

[0031] Figure 6 This is a schematic diagram of the structure of the pressure collecting part of the present invention after downward movement;

[0032] Figure 7 This is a schematic diagram of the exploded structure of the pressure collection part and the pipe section of the present invention;

[0033] Figure 8 It is a schematic diagram of the planar separation structure of the pipe section and the pressure collecting part in the initial state of the present invention;

[0034] Figure 9 This is a schematic diagram of the planar separation structure of the pipe section and the pressure collection part after deformation of the present invention;

[0035] Figure 10 This is a schematic diagram of a half-section structure of the pressure collecting part of the present invention;

[0036] Figure 11 This is a schematic diagram of the outer structure of the pipe section of the present invention;

[0037] Figure 12 This invention Figure 11 Schematic diagram of the locally enlarged structure of A in the middle.

[0038] In the figure: 1. sampling pump; 11. air pressure sensor; 2. air pipe; 3. pull rope; 4. layered pipe; 5. pipe end 1; 6. pipe end 2; 7. pipe section; 71. segmented opening; 72. upper chamber; 721. support ring 1; 73. lower chamber; 731. support ring 2; 732. closing ring; 74. pressure collecting part; 741. pressure pipe; 742. upper sealing plate; 743. lower sealing plate; 744. push ring; 745. closing cover; 75. air pressure transmission part; 751. ring 1; 752. shaft; 753. cover plate; 754. spring body; 76. elastic support part; 761. support shaft; 762. support spring; 763. extension end; 77. buckle; 771. clamping shaft; 8. sealing cover; 81. threaded pipe end 1; 9. connecting part; 91. threaded pipe end 2; 92. intermediate pipe. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] See also Figures 1-12 The present invention provides a technical solution: a groundwater stratification sampling device to prevent pollution, such as Figure 1 、 Figure 2 and Figure 3As shown, it includes a sampling pump 1 and a layered tube 4. The layered tube 4 includes a tube end 1 5 at the head, a tube end 2 6 at the tail, and several tube segments 7 in the middle. The tube end 1 5, the tube end 2 6, and the ends of the tube segments 7 are all fixed with sealing covers 8. A connecting portion 9 is installed between the sealing covers 8 and the adjacent sealing covers 8.

[0041] like Figure 5 As shown, a segmented opening 71 is provided in the middle portion of the pipe section 7, and the pipe section 7 is divided into an upper chamber 72 and a lower chamber 73 through the segmented opening 71. A pressure collecting portion 74 driven to move under air pressure is installed in the upper chamber 72 and the lower chamber 73. The pressure collecting portion 74 moves into the lower chamber 73 to cause negative pressure water to enter the lower chamber 73.

[0042] Specifically, the tube end 1 5 at the head, the tube end 2 6 at the tail and the several tube sections 7 in the middle part form a long tube body structure. When the sampling pump 1 drives the gas to move into the inside of the tube body structure, the pressure collecting part 74 moves, and the negative pressure collects the water samples at the relative position.

[0043] like Figure 4 As shown, a threaded pipe end 1 81 is fixed to the outside of the sealing cover 8, and the connecting part 9 includes a threaded pipe end 2 91 at both ends and an intermediate pipe 92 in the middle. The threaded pipe end 2 91 at both ends and the intermediate pipe 92 are integrally arranged, and the threaded pipe end 2 91 is threadedly connected to the threaded pipe end 1 81 to connect the inside of the layered pipe 4.

[0044] Specifically, by quickly assembling and disassembling the first and second threaded pipe ends 81 and 91, the number of pipe segments 7 can be freely combined, and the connecting portion 9 can be replaced with different lengths to achieve different depth detection. It should be noted that even if the detection position is not vertical, the connecting portion 9 can change the position and angle of two adjacent pipe segments 7, allowing the layered pipe 4 to extend along different paths and adapt to changing environments.

[0045] like Figure 6 、 Figure 7 、 Figure 8 and Figure 9 As shown, Figure 6 is a state diagram after the pressure collecting part 74 moves downward, Figure 7 This is a separation diagram of the initial state of the pressure collection unit 74. Figure 8 and Figure 9 This is a diagram showing the separation of the pressure collecting portion 74 and the pipe section 7. Figure 8 Specifically, before the pressure collecting part 74 moves, Figure 9After the pressure collecting portion 74 moves, the inner walls of the upper chamber 72 and the lower chamber 73 near the segmented opening 71 are respectively provided with a first support ring 721 and a second support ring 731. The side of the first support ring 721 facing the segmented opening 71 is affixed with a closing cover 745, and the side of the second support ring 731 facing the segmented opening 71 is fixed with a closing ring 732. The lower end of the closing cover 745 has an elastic support portion 76 to support it.

[0046] The pressure collecting portion 74 includes a pressure tube 741 that passes through a sealing cover 745 , with an upper sealing plate 742 and a lower sealing plate 743 fixed at each end. The upper sealing plate 742 and the lower sealing plate 743 are located in the upper chamber 72 and the lower chamber 73 , respectively. A push ring 744 is also fixed to the outer wall of the pressure tube 741 for pushing the sealing cover 745 . The pressure tube 741 has a pneumatic transmission portion 75 inside it, which is used to seal the pressure tube 741 and open it when a certain pressure is reached.

[0047] When resetting, the lower sealing plate 743 is sealed against the lower end of the second support ring 731 . When collecting water, the upper sealing plate 742 is fitted against the upper end of the first support ring 721 , and the push ring 744 pushes the closing cover 745 to make it fit and seal against the closing ring 732 .

[0048] The outer sides of the upper sealing plate 742 and the lower sealing plate 743 are respectively sealed and fitted with the inner walls of the upper chamber 72 and the lower chamber 73 and are movable.

[0049] Specifically, when the pressure collecting part 74 is driven downward by air pressure, the lower sealing plate 743 separates from the support ring 2 731 to form a negative pressure water inlet channel. The closing cover 745 forms a seal with the closing ring 732 under the action of the push ring 744 to prevent the mixing of water between layers. The elastic support part 76 and the buckle 77 work together to automatically lock the sealing state after sampling is completed.

[0050] It should be noted that the segmented opening 71 is the water inlet portion. When the pressure collecting portion 74 moves downward, the upper sealing plate 742 in the pressure collecting portion 74 moves downward, and the space of the upper chamber 72 located at the upper end of the upper sealing plate 742 gradually increases, and the space located at its lower end gradually decreases. The air pressure in the gradually decreasing space of the upper chamber 72 will gradually increase, and there is a possibility that the gas will move outward from the edge of the closing cover 745. Even if the gas moves outward, the gas is located near the upper end of the segmented opening 71, and the part that absorbs the negative pressure of the water is near the lower end of the segmented opening 71. Therefore, even if upward gas is generated when collecting water samples, it will not affect the water sample at the collection position. It should also be noted that the water samples of the multi-segment pipe segment 7 are collected one by one from top to bottom, and the generated gas moves upward, so it will not affect the position of the water sample collected at the lower end. It should also be noted that the pressure collecting portion 74 is located in the pipe segment 7 and moves downward, such as Figures 8 and 9With the change, the space of the lower chamber 73 at the lower end of the lower sealing plate 743 gradually decreases, and the air pressure also increases to a certain extent, which will push the pressure collecting part 74 in the next pipe segment 7 to a certain extent. However, due to the support of the elastic support part 76 on the closing cover 745, the air pressure in the upper chamber 72 of the next pipe segment 7 increases to a certain extent, and no gas leakage occurs. Until the collection of the lower chamber 73 of the previous pipe segment 7 is completed, the air pressure continues to enter the upper chamber 72 of the next pipe segment 7, which will cause the gas leakage in the upper chamber 72 of the next pipe segment 7.

[0051] In addition, although the pressure tube 741 passes through the closing cover 745, the pressure tube 741 and the closing cover 745 are sealed to prevent the pressure collecting part 74 in the next pipe section 7 from partially moving downward when the previous pipe section 7 is collecting water samples, thereby preventing bubbles from being generated.

[0052] like Figure 10 As shown, the pneumatic transmission part 75 includes a ring 751 fixed inside the pressure tube 741, and a shaft 752 is provided in the ring 751. Cover plates 753 are respectively fixed to both ends of the shaft 752, wherein the cover plate 753 at the lower end is sealed and fitted with the lower end of the ring 751, and a spring body 754 is provided between the cover plate 753 at the upper end and the ring 751. The spring body 754 is in a compressed state. When the pressure increases, the spring body 754 will be further compressed to put the pneumatic transmission part 75 in a connected state.

[0053] The multiple pipe sections 7 all have spring bodies 754 and are distributed from top to bottom. The spring bodies 754 distributed from top to bottom have the same spring coefficient.

[0054] Specifically, a series of pipe segments 7 are used, each equipped with a spring 754 having the same spring constant. When the sampling pump 1 injects gas, the pressure is transmitted step by step through the pneumatic transmission unit 75. When the upper pipe segment 7 reaches the set pressure, the spring 754 compresses, opening the channel and allowing gas to enter the next layer. Each layer is activated sequentially, ensuring a top-down sampling process. The end pressure sensor 11 monitors the completion status in real time, achieving closed-loop control.

[0055] like Figure 11 and Figure 12 As shown, the elastic support portion 76 includes a support shaft 761 fixed on the outside of the pipe section 7, and the support shaft 761 is outer-circuited with a support spring 762. The outer side of the closing cover 745 is integrally provided with an extension end 763, which is sleeved with the support shaft 761 and abutted against the support spring 762.

[0056] Specifically, the elastic support portion 76 supports the closing cover 745 to prevent the pressure collecting portion 74 in the next pipe section 7 from partially moving downward when the previous pipe section 7 is collecting water samples, thereby preventing bubbles from being generated.

[0057] A buckle 77 is also fixed to the outside of the pipe section 7. The buckle 77 has a spring inside and a clamping shaft 771 extending inward and outward. The outer end of the clamping shaft 771 is set with an upward inclined surface. When the extended end 763 moves downward, the extended end 763 is buckled to seal the lower chamber 73.

[0058] The downwardly moving extension end 763 is pressed against the inclined surface of the clamping shaft 771, causing the clamping shaft 771 to contract. After the subsequent downward movement of the extension end 763, the clamping shaft 771 extends again, locking the extension end 763. After the pipe section 7 takes out the water sample upward, the clamping shaft 771 is contracted by toggling the buckle 77, and the closing cover 745 can move upward to pour out the collected water sample. At the same time, the pressure collection part 74 needs to be manually reset. It should be noted that when resetting the pressure collection part 74, the connecting part 9 needs to be separated, so that the pipe sections 7 form separate units, which can store water samples separately and reset the pressure collection part 74.

[0059] An air pipe 2 is fixed between the sampling pump 1 and the pipe end 5, and a pull rope 3 is connected to the outside of the pipe end 5. The pull rope 3 is used to change the depth of the layered pipe 4 moving downward in the water.

[0060] like Figure 3 As shown, there is an air pressure sensor 11 inside the pipe end 6, and a controller is installed in the sampling pump 1. The air pressure sensor 11 and the sampling pump 1 are both electrically connected to the controller. The end air pressure sensor 11 monitors the completion status in real time to achieve closed-loop control.

[0061] The working principle of the present invention is as follows: first, the stratified tube 4 is placed downward into the groundwater to be tested. After the stratified tube 4 reaches a certain position, the sampling pump 1 supplies air to the inside of the stratified tube 4 through the air pipe 2, so that there is pressure inside the pipe section 7, and as the pressure increases, the pressure collecting part 74 is pushed downward, and the upper sealing plate 742 and the lower sealing plate 743 located in the upper chamber 72 and the lower chamber 73 both move downward, and the upper end of the lower chamber 73 originally closed by the lower sealing plate 743 will open. As the lower sealing plate 743 moves downward, the water is adsorbed inwardly under negative pressure. Since the opening at the upper end of the lower chamber 73 is relatively large, the moving speed of the lower sealing plate 743 is relatively slow, and the water of a relatively deep depth moves slowly into the lower chamber 73 to complete the collection of the water sample. Finally, the pressure increases, the pressure collecting part 74 continues to move downward, and the push ring 744 pushes the closing cover 745 downward. The final sealed cover of the closing cover 745 is located at the upper end of the closing ring 732, completing the collection of water samples at a certain depth. Finally, the extended end 763 of the closing cover 745 is fastened by the buckle 77 to maintain the closed state and prevent the water sample from moving outward.

[0062] It should be noted that the downward movement of the pressure collecting part 74 is divided into multiple steps. In step one, the upper end of the pressure collecting part 74 is subjected to pressure, and the overall pressure collecting part 74 moves downward. In step two, the push ring 744 pushes the closing cover 745 supported by the elastic support part 76 to move downward. In step three, the upper sealing plate 742 is offset against the support ring 1 721, so that there is a certain air pressure inside the upper chamber 72. In step four, the push ring 744 pushes the closing cover 745 and presses it against the closing ring 732. Step four is performed simultaneously with step three. In step five, as the air pressure gradually increases, the spring body 754 in the pneumatic transmission part 75 will be subjected to a force that further increases the air pressure, causing the gas to move downward from the pressure tube 741 to the next pipe section 7 and repeat the above movement under the action of air pressure.

[0063] The spring bodies 754 in the arranged pneumatic transmission parts 75 have the same spring coefficient, which is equivalent to the function of a pressure relief valve. When the pressure in the upper chamber 72 of the previous pipe section 7 increases to the pressure relief point, the pressure is relieved downward and the gas enters the upper chamber 72 of the next pipe section 7, repeating the movement of pushing the pressure collection part 74 downward. When the pressure in the upper chamber 72 of the next pipe section 7 reaches the threshold, the pressure is further relieved downward, and multiple pipe sections 7 from top to bottom collect water samples.

[0064] When the air pressure reaches the lowermost pipe end 2 6, as the internal air pressure of the pipe end 2 6 increases, the air pressure sensor 11 performs real-time detection, so that the operator knows that all water samples have been collected.

[0065] It should also be noted that the connection portion 9 between the pipe sections 7 can be disassembled and replaced to meet the requirements of different environments and collect water samples at different depths.

[0066] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0067] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A pollution-proof groundwater stratified sampling device, comprising a sampling pump (1) and a stratified tube (4), characterized in that: The layered tube (4) comprises a tube end 1 (5) at the head, a tube end 2 (6) at the tail, and a plurality of tube sections (7) at the middle portion. The tube end 1 (5), the tube end 2 (6), and the ends of the tube sections (7) are all fixed with sealing covers (8), and connecting parts (9) are installed between the sealing covers (8) and adjacent sealing covers (8). The middle portion of the pipe section (7) is provided with a segment opening (71), and the interior of the pipe section (7) is divided into an upper chamber (72) and a lower chamber (73) through the segment opening (71). A pressure collecting portion (74) driven to move under air pressure is installed in the upper chamber (72) and the lower chamber (73). The pressure collecting portion (74) moves into the lower chamber (73) to cause negative pressure water to enter the lower chamber (73).

2. The anti-pollution groundwater stratified sampling device according to claim 1, characterized in that: A threaded pipe end (81) is fixed on the outside of the sealing cover (8), and the connecting portion (9) includes threaded pipe ends (91) at both ends and an intermediate pipe (92) in the middle. The threaded pipe ends (91) at both ends and the intermediate pipe (92) are integrally arranged, and the threaded pipe ends (91) are threadedly connected to the threaded pipe end (81) to connect the interior of the layered pipe (4).

3. The anti-pollution groundwater stratified sampling device according to claim 1, characterized in that: The inner walls of the upper chamber (72) and the lower chamber (73) close to the segmented opening (71) are respectively provided with a circle of support ring 1 (721) and support ring 2 (731); the support ring 1 (721) is attached to the side facing the segmented opening (71) with a closing cover (745); the support ring 2 (731) is fixed to the side facing the segmented opening (71) with a closing ring (732); the lower end of the closing cover (745) is provided with an elastic support portion (76) for supporting it; The pressure collecting portion (74) includes a pressure tube (741) that passes through a closing cover (745), with an upper sealing plate (742) and a lower sealing plate (743) fixed at both ends. The upper sealing plate (742) and the lower sealing plate (743) are respectively located in the upper chamber (72) and the lower chamber (73). A push ring (744) for pushing the closing cover (745) is also fixed to the outer wall of the pressure tube (741). The pressure tube (741) has a pneumatic transmission portion (75) inside. The pneumatic transmission portion (75) is used to close the pressure tube (741) and open when a certain pressure is reached. When resetting, the lower sealing plate (743) is sealed against the lower end of the second support ring (731); when collecting water, the upper sealing plate (742) is sealed against the upper end of the first support ring (721), and the push ring (744) pushes the closing cover (745) to make it seal against the closing ring (732).

4. The anti-pollution groundwater stratified sampling device according to claim 3, characterized in that: The outer sides of the upper sealing plate (742) and the lower sealing plate (743) are respectively sealed and fitted with the inner walls of the upper chamber (72) and the lower chamber (73) and are movable.

5. The anti-pollution groundwater stratified sampling device according to claim 3, characterized in that: The pneumatic transmission part (75) includes a ring (751) fixed inside the pressure tube (741), a shaft (752) is provided inside the ring (751), and cover plates (753) are respectively fixed at both ends of the shaft (752), wherein the cover plate (753) at the lower end is sealed and fitted with the lower end of the ring (751), and a spring body (754) is provided between the cover plate (753) at the upper end and the ring (751), and the spring body (754) is in a compressed state. When the pressure increases, the spring body (754) will be further compressed to put the pneumatic transmission part (755) in a connected state.

6. The anti-pollution groundwater stratified sampling device according to claim 5, characterized in that: The multiple pipe sections (7) all have spring bodies (754) and are distributed from top to bottom. The spring bodies (754) distributed from top to bottom have the same spring coefficient.

7. The anti-pollution groundwater stratified sampling device according to claim 3, characterized in that: The elastic support portion (76) includes a support shaft (761) fixed on the outside of the pipe section (7), and a support spring (762) is connected to the outer surface of the support shaft (761). The outer side of the closing cover (745) is integrally provided with an extension end (763), and the extension end (763) is connected to the support shaft (761) and abuts against the support spring (762).

8. The anti-pollution groundwater stratified sampling device according to claim 7, characterized in that: A buckle (77) is also fixed on the outside of the tube section (7), and a spring is provided inside the buckle (77) and a clamping shaft (771) extending inwardly and outwardly. The outer end of the clamping shaft (771) is provided with an upwardly inclined surface. When the extension end (763) moves downward, the extension end (763) is buckled, thereby sealing the lower chamber (73).

9. The anti-pollution groundwater stratified sampling device according to claim 1, characterized in that: An air tube (2) is fixed between the sampling pump (1) and the tube end (5), and a pull rope (3) is also connected to the outside of the tube end (5).

10. The anti-pollution groundwater stratified sampling device according to claim 1, characterized in that: The second pipe end (6) has an air pressure sensor (11) inside, and the sampling pump (1) is installed with a controller. The air pressure sensor (11) and the sampling pump (1) are both electrically connected to the controller.

Images