A pollution-proof groundwater layered sampling device

Abstract

The present application relates to the technical field of groundwater collection, and discloses a pollution-preventing layered groundwater sampling device, which comprises a sampling pump and a layered pipe, wherein the layered pipe comprises a pipe end one at the head, a pipe end two at the tail, and a plurality of pipe sections in the middle part; the pipe end one, the pipe end two and the pipe section end part are fixed with sealing covers; and the sealing covers and the adjacent sealing covers are provided with connecting parts; the pipe section middle part is provided with a sectioning opening; the pipe section is divided into an upper chamber and a lower chamber through the sectioning opening; the upper chamber and the lower chamber are provided with pressure collecting parts which are driven to move under the action of air pressure; and the pressure collecting parts move into the lower chamber to make the lower chamber negative pressure to let water in. When collecting water samples, the independent chamber structure makes the water samples in each layer physically isolated, the water samples in the relative depth are more accurately extracted, and various water samples in different depths are collected at one time through the action of the air pressure of the sampling pump, so that the water body is not disturbed too much.

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] Accurately monitoring groundwater quality parameters at different depths is crucial for environmental assessment and remediation. The collection process requires obtaining groundwater samples 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] Further, the outer side of the sealing cover is fixed with a threaded pipe end one, the connecting part includes two threaded pipe ends two and an intermediate pipe, the two threaded pipe ends two are integrally arranged with the intermediate pipe, the threaded pipe ends two are threadedly connected with the threaded pipe end one, and the inside of the layered pipe is communicated.

[0010] Further, the inner walls of the upper chamber and the lower chamber near the segmentation port are respectively provided with a support ring one and a support ring two, one side of the support ring one towards the segmentation port is attached with a sealing cover, one side of the support ring two towards the segmentation port is fixed with a sealing ring, and the lower end of the sealing cover is provided with an elastic support part for supporting the sealing cover.

[0011] The pressure collecting part includes a pressure pipe penetrating through the sealing cover, the two ends of the pressure pipe are respectively fixed with an upper sealing plate and a lower sealing plate, the upper sealing plate and the lower sealing plate are respectively located in the upper chamber and the lower chamber, the outer wall of the pressure pipe is further fixed with a pushing ring for pushing the sealing cover, the inside of the pressure pipe is provided with a gas pressure transmission part, and the gas pressure transmission part is used for sealing the pressure pipe and opening when a certain pressure is reached.

[0012] When resetting, the lower sealing plate is sealingly attached with the lower end of the support ring two, when collecting water, the upper sealing plate is attached with the upper end of the support ring one, and the pushing ring pushes the sealing cover to be sealingly attached with the sealing ring.

[0013] Further, the outer sides of the upper sealing plate and the lower sealing plate are respectively sealingly attached with the inner walls of the upper chamber and the lower chamber and can move.

[0014] Further, the gas pressure transmission part includes a ring one fixed in the inside of the pressure pipe, the ring one is provided with a shaft rod, the two ends of the shaft rod are respectively fixed with cover plates, the lower end of the cover plate is sealingly attached with the lower end of the ring one, a spring body is arranged between the upper end of the cover plate and the ring one, and the spring body is in a compressed state, and when the pressure increases, the spring body is further compressed to make the gas pressure transmission part in a communication state.

[0015] Further, the spring bodies are arranged in the pipe segments and are distributed from top to bottom, and the stiffness coefficients of the spring bodies distributed from top to bottom are the same.

[0016] Further, the elastic support part includes a support shaft fixed on the outer side of the pipe segment, a support spring is sleeved on the support shaft, the outer side of the sealing cover is integrally provided with an extension end, the extension end is sleeved with the support shaft and abuts against the support spring.

[0017] Further, the outer side of the pipe segment is further fixed with a buckle, the buckle is provided with a spring and a clamping shaft extending inside and outside, the outer end of the clamping shaft is provided as an upward inclined surface, and when the extension end moves downward, the extension end is buckled to seal the lower chamber.

[0018] Further, the sampling pump is fixed with an air pipe between the pipe end one and the pipe end two, and a pull rope is connected to the outside of the pipe end one.

[0019] Further, the pipe end two is internally provided with an air pressure sensor, and the sampling pump is internally provided with a controller, and the air pressure sensor and the sampling pump are electrically connected with the controller.

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

[0021] 1. When collecting water samples, the independent chamber structure makes the water samples of different layers physically isolated, and the water samples of different depths are collected at one time through the air pressure of the sampling pump, so as to avoid excessive disturbance to the water body.

[0022] 2. The pipe segments can be freely increased or decreased, and the connecting part can be replaced with different lengths, so as to adjust the depth and number of the pipe segments and realize flexible operation.

[0023] 3. Each pipe segment is collected through the pressure collecting part, and after collection, only the lower chamber contains water samples, and the upper chamber is closed by the upper sealing plate, so as to avoid the upward movement of the excess water samples, and only the water samples collected in the lower chamber exist, so as to avoid the mixing of the water samples due to operation.

[0024] 4. The pipe segments can be separated and stored individually, without the need of additional filling of the water samples, so as to improve portability and realize cleaning without dead angle. DETAILED DESCRIPTION

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

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

[0027] Figure 2 is a schematic diagram of the layered pipe structure of the present application;

[0028] Figure 3 is a schematic diagram of the layered pipe structure of the present application;

[0029] Figure 4 is a schematic diagram of the layered pipe structure of the present application;

[0030] Figure 5 is a schematic diagram of the internal structure of two adjacent pipe segments of the present application;

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

[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, including sampling pump 1 and layered tube 4, layered tube 4 includes the first tube end one 5, the second tube end two 6 and the middle part of several tube segments 7, the tube end one 5, the tube end two 6 and the tube segment 7 are fixed with the sealing cover 8, the sealing cover 8 is installed with the connecting part 9 between the adjacent sealing cover 8;

[0041] As shown in the figure, Figure 5 The middle part of the tube segment 7 is provided with a segment port 71, and the tube segment 7 is divided into an upper chamber 72 and a lower chamber 73 by the segment port 71, and the pressure collecting part 74 driven by the gas pressure is installed in the upper chamber 72 and the lower chamber 73, and the pressure collecting part 74 moves to the lower chamber 73 to collect water in the lower chamber 73.

[0042] Specifically, the first tube end one 5, the second tube end two 6 and the middle part of several tube segments 7 form a long tube structure, when the sampling pump 1 drives the gas to move to the inside of the tube structure, the movement of the pressure collecting part 74 is realized, and the negative pressure collects the water sample in the relative position.

[0043] As shown in the figure, Figure 4 The outer side of the sealing cover 8 is fixed with the threaded tube end one 81, the connecting part 9 includes the threaded tube end two 91 at both ends and the middle tube 92 in the middle, the threaded tube end two 91 is integrally provided with the middle tube 92, the threaded tube end two 91 is screwed with the threaded tube end one 81, and the inside of the layered tube 4 is communicated.

[0044] Specifically, the threaded tube end one 81 and the threaded tube end two 91 are quickly disassembled to realize the free combination of the number of tube segments 7, the connecting part 9 can be replaced with different lengths to realize different depth detection. It should be noted that even if the detection position is not in the vertical state, the position and angle of the two adjacent tube segments 7 can be changed through the connecting part 9, so that the layered tube 4 can extend along different paths to adapt to the changeable environment.

[0045] As shown in the figure, Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown in the figure, Figure 6 is the state diagram of the downward movement of the pressure collecting part 74, Figure 7 is the initial state separation diagram of the pressure collecting part 74, Figure 8 and Figure 9 is the separation diagram of the pressure collecting part 74 and the tube segment 7, Figure 8 Specifically, before the movement of the pressure collecting part 74, Figure 9For the movement of the pressure collecting part 74, the inner wall of the upper chamber 72 and the lower chamber 73 near the segmented port 71 is respectively provided with a support ring one 721 and a support ring two 731, the side of the support ring one 721 towards the segmented port 71 is attached with a closing cover 745, the side of the support ring two 731 towards the segmented port 71 is fixed with a closing ring 732, the lower end of the closing cover 745 is provided with an elastic support part 76 for supporting the closing cover 745;

[0046] The pressure collecting part 74 comprises a pressure pipe 741 penetrating through the closing cover 745, the two ends of the pressure pipe 741 are respectively fixed with an upper sealing plate 742 and a lower sealing plate 743, the upper sealing plate 742 and the lower sealing plate 743 are respectively located in the upper chamber 72 and the lower chamber 73, the outer wall of the pressure pipe 741 is further fixed with a pushing ring 744 for pushing the closing cover 745, the inside of the pressure pipe 741 is provided with a pneumatic transmission part 75 for closing the pressure pipe 741 and opening when a certain pressure is reached;

[0047] When resetting, the lower sealing plate 743 is sealingly attached with the lower end of the support ring two 731, when collecting water, the upper sealing plate 742 is attached with the upper end of the support ring one 721, and the pushing ring 744 pushes the closing cover 745 to be sealingly attached with the closing ring 732.

[0048] The outer side of the upper sealing plate 742 and the lower sealing plate 743 is respectively sealingly attached with the inner wall of the upper chamber 72 and the lower chamber 73 and can move.

[0049] Specifically, when the pressure collecting part 74 is driven by the air pressure to move downward, the lower sealing plate 743 is separated from the support ring two 731 to form a negative pressure water inlet channel, the closing cover 745 is sealingly formed with the closing ring 732 under the action of the pushing ring 744 to prevent the mixing of interlayer water, and the elastic support part 76 cooperates with the buckle 77 to automatically lock the sealing state after sampling is completed.

[0050] It should be noted that the segmented port 71 is a water inlet part, when the pressure collecting part 74 moves downward, the upper sealing plate 742 in the pressure collecting part 74 moves downward, the space above the upper end of the upper sealing plate 742 gradually increases, the space below the 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 moves 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 port 71, and the part for water negative pressure adsorption is near the lower end of the segmented port 71, so even if upward gas is generated when collecting water samples, it will not affect the water sample at the water sample collection position. In addition, it should be noted that the water samples of the multi-segment pipe section 7 are collected one by one from top to bottom, and the generated gas moves upward, so it will not affect the water sample collection position at the lower end. It should be noted that the pressure collecting part 74 moves downward in the pipe section 7, like Figures 8-9When the pressure in the lower chamber 73 of the upper tube segment 7 changes, the space in the portion of the lower end of the lower sealing plate 743 gradually decreases, and the air pressure increases to a certain extent. The pressure in the pressure collecting portion 74 of the next tube segment 7 is pushed to a certain extent, but the elastic support portion 76 supports the closure cover 745, which causes the air pressure in the upper chamber 72 of the next tube segment 7 to increase to a certain extent, and the air leakage does not occur. Until the lower chamber 73 of the upper tube segment 7 is completely collected, the air pressure continues to enter the upper chamber 72 of the next tube segment 7, which causes the air leakage of the upper chamber 72 of the next tube segment 7.

[0051] In addition, the pressure pipe 741 penetrates the closure cover 745, but the pressure pipe 741 and the closure cover 745 are sealed to prevent the partial downward movement of the pressure collecting portion 74 in the next tube segment 7 from causing the air bubbles when the water sample is collected in the upper tube segment 7.

[0052] As shown in Figure 10 The air pressure transmission portion 75 includes a ring one 751 fixed in the pressure pipe 741, the ring one 751 is provided with a shaft 752, and the two ends of the shaft 752 are respectively fixed with a cover plate 753. The lower end of the cover plate 753 is sealed and attached to the lower end of the ring one 751, and the upper end of the cover plate 753 is provided with a spring body 754 between the ring one 751. The spring body 754 is in a compressed state, and when the pressure increases, the spring body 754 is further compressed to make the air pressure transmission portion 75 in a connected state.

[0053] The spring body 754 is distributed from top to bottom in the multi-segment tube segment 7, and the spring body 754 has the same stiffness coefficient from top to bottom.

[0054] Specifically, a series connection type tube segment 7 structure is adopted, each tube segment 7 is provided with a spring body 754 having the same stiffness coefficient. When the sampling pump 1 injects the gas, the pressure is transmitted step by step through the air pressure transmission portion 75. When the upper tube segment 7 reaches the set pressure, the spring body 754 is compressed to open the channel, and the gas enters the next layer. Each layer is activated in turn to ensure that the sampling process is sequentially performed from top to bottom. The end air pressure sensor 11 monitors the completion state in real time to realize closed-loop control.

[0055] As shown in Figure 11 and Figure 12 The elastic support portion 76 includes a support shaft 761 fixed outside the tube segment 7, the support shaft 761 is sleeved with a support spring 762, and the outside of the closure cover 745 is integrally provided with an extension end 763. The extension end 763 is sleeved with the support shaft 761 and abuts against the support spring 762.

[0056] Specifically, the elastic support portion 76 supports the closure cover 745 to prevent the partial downward movement of the pressure collecting portion 74 in the next tube segment 7 from causing the air bubbles when the water sample is collected in the upper tube segment 7.

[0057] The outer side of the pipe section 7 is further fixed with a buckle 77, the buckle 77 is internally provided with a spring and has an internally and externally extending clamping shaft 771, the outer end of the clamping shaft 771 is provided as an upward inclined surface, and the downward movement of the extending end 763 realizes the buckling of the extending end 763 and the sealing of the lower chamber 73.

[0058] The downward movement of the extending end 763 extrudes the inclined surface of the clamping shaft 771, so that the clamping shaft 771 is contracted, and after the subsequent downward movement of the extending end 763, the clamping shaft 771 is extended again to clamp the extending end 763. After the water sample is taken out upwardly by the pipe section 7, the clamping shaft 771 is contracted by pulling the buckle 77, the closure cover 745 can move upwardly, the collected water sample is poured out, and the pressure collecting part 74 needs to be reset manually. It should be noted that when the pressure collecting part 74 is reset, the connecting part 9 needs to be separated, so that the pipe section 7 forms a single individual, the water sample can be stored individually, and the pressure collecting part 74 can be reset.

[0059] The sampling pump 1 is fixed with an air pipe 2 between the pipe end one 5, and the outer side of the pipe end one 5 is further connected with a pull rope 3. The pull rope 3 realizes the change of the depth of the downward movement of the layered pipe 4 in water.

[0060] As shown in Figure 3 The pipe end two 6 is internally provided with an air pressure sensor 11, the sampling pump 1 is internally installed with a controller, and the air pressure sensor 11 and the sampling pump 1 are electrically connected with the controller. The terminal air pressure sensor 11 monitors the completion state in real time, realizes closed-loop control.

[0061] The working principle of the present application is as follows: first, the layered pipe 4 is placed downwardly into underground water to be detected, after the layered pipe 4 reaches a certain position, the sampling pump 1 inputs air into the interior of the layered pipe 4 through the air pipe 2, so that the pipe section 7 has pressure, and with the increase of the pressure, the pressure collecting part 74 is pushed downwardly, the upper sealing plate 742 and the lower sealing plate 743 in the upper chamber 72 and the lower chamber 73 are moved downwardly, the upper end of the lower chamber 73 originally closed by the lower sealing plate 743 is opened, with the downward movement of the lower sealing plate 743, water is adsorbed inwardly by negative pressure, because the opening of the upper end of the lower chamber 73 is relatively large and the moving speed of the lower sealing plate 743 is relatively slow, the relatively deep water slowly moves into the lower chamber 73, the collection of the water sample is completed, finally, with the increase of the pressure, the pressure collecting part 74 continues to move downwardly, and the push ring 744 pushes the closure cover 745 downwardly, the closure cover 745 finally seals the cover arranged on the upper end of the closure ring 732, the collection of the water sample at a certain depth is completed. Finally, the extending end 763 of the closure cover 745 is buckled by the buckle 77, and the closure state is maintained, so as to avoid the outward movement of the water sample.

[0062] The pressure collecting part 74 moves downward in multiple steps. In step one, the upper end of the pressure collecting part 74 is pressed, and the whole pressure collecting part 74 moves downward. In step two, the push ring 744 pushes the closing cover 745 supported by the elastic supporting part 76 downward. In step three, the upper sealing plate 742 abuts against the supporting ring one 721, so that the upper chamber 72 has a certain air pressure. In step four, the push ring 744 pushes the closing cover 745 and presses it against the closing ring 732. Step four is performed synchronously with step three. In step five, under the condition that the air pressure gradually increases, the spring body 754 in the air pressure transmission part 75 is subjected to further force of the air pressure, so that the gas moves downward from the pressure pipe 741 to the next pipe section 7 and repeats the above movement under the action of the air pressure.

[0063] The spring bodies 754 in the arranged air pressure transmission part 75 have the same stiffness 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 a pressure relief point, downward pressure relief is realized, and the gas enters the upper chamber 72 of the next pipe section 7, so that the movement of pushing the pressure collecting part 74 downward is repeated. Then, when the pressure in the upper chamber 72 of the next pipe section 7 reaches a threshold value, further downward pressure relief is realized. The multiple pipe sections 7 from top to bottom all collect water samples.

[0064] When the air pressure reaches the lowermost pipe end two 6, the air pressure sensor 11 detects in real time as the air pressure in the pipe end two 6 increases, so that the operator knows that the water sample has been completely collected.

[0065] It is also to be noted that the connecting part 9 connected between the pipe sections 7 can be disassembled and replaced, so as to adapt to different environments and collect water samples of different depths.

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

[0067] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that the technical solutions described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalent ones. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

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 segments (7) at the middle portion. 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 cover (8) and the adjacent sealing cover (8). The connecting portion is used to connect the interiors of the layered tubes. A segmented opening (71) is provided in the middle of the pipe section (7), and the interior of 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); The inner wall of the upper chamber (72) near the segmented opening (71) is provided with a circle of support ring 1 (721), and the inner wall of the lower chamber (73) near the segmented opening (71) is provided with support ring 2 (731). A closing cover (745) is attached to the side of the support ring 1 (721) facing the segmented opening (71), and a closing ring (732) is fixed to the side of the support ring 2 (731) facing the segmented opening (71). 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 the closing cover (745), with an upper sealing plate (742) and a lower sealing plate (743) fixed at both ends, respectively. 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, and the pneumatic transmission portion (75) is used to close the pressure tube (741) and open when a certain pressure is reached. 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; 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 seal against the closing ring (732).

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

3. The anti-pollution groundwater stratified sampling device according to claim 1, 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 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), 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.

4. The anti-pollution groundwater stratified sampling device according to claim 3, characterized in that: The multiple tube sections (7) all have spring bodies (754) and are distributed from top to bottom, and the spring bodies (754) distributed from top to bottom have the same spring coefficient.

5. The anti-pollution groundwater stratified sampling device according to claim 1, characterized in that: The elastic support portion (76) comprises a support shaft (761) fixed on the outside of the pipe section (7), a support spring (762) being connected to the outer surface of the support shaft (761), and an extension end (763) is integrally provided on the outer side of the closing cover (745), the extension end (763) being connected to the support shaft (761) and abutting against the support spring (762).

6. The anti-pollution groundwater stratified sampling device according to claim 5, characterized in that: A buckle (77) is also fixed to the outside of the tube section (7), and the buckle (77) has a spring inside and a clamping shaft (771) extending inwardly and outwardly. The outer end of the clamping shaft (771) is arranged in an upwardly inclined surface. When the extension end (763) moves downward, the extension end (763) is buckled, thereby sealing the lower chamber (73).

7. 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 first tube end (5), and a pull rope (3) is also connected to the outside of the first tube end (5).

8. 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.

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