Underground water monitoring device for preventing cross contamination of underground water
By using a filter cartridge and a combined sampling cartridge structure in the groundwater monitoring device, the problems of sediment mixing and cross-contamination were solved, achieving pure sampling and efficient detection, and expanding the applicability of the device.
Patent Information
- Application Number
- CN202511066793.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-31
- Publication Date
- 2025-11-07
AI Technical Summary
Existing groundwater monitoring devices are prone to introducing sediment during sampling, leading to turbidity and cross-contamination of groundwater.
A filter cartridge is used to isolate sediment. The filter holes and sealing structure inside the filter cartridge prevent sediment from entering the sampled water. A combination structure of sampling cartridge and connecting cartridge is used to sample groundwater at different depths. The water inlet structure and sampling structure achieve sampling without direct contact to prevent cross-contamination.
To ensure the purity of the sampled water, prevent cross-contamination of groundwater, improve the accuracy of test results, expand the applicability of the device, reduce the difficulty of sampling, and improve work efficiency.
Smart Images
Figure CN120907899A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of groundwater monitoring, in particular to a groundwater monitoring device for preventing cross contamination of groundwater. BACKGROUND
[0002] With the rapid development of industry, groundwater pollution has also been brought about. Monitoring of pollutants in groundwater is an important work content in the field of environmental monitoring, and also provides guidance for site risk assessment and soil remediation. Groundwater monitoring generally uses the method of stratified pumping and sampling test. In the same drill hole, a drill hole with different diameters is constructed in the aquifer at different depths. Firstly, most of the existing groundwater exists in the cracks and gaps of soil, which causes a large amount of silt to be mixed during sampling, thereby causing the groundwater to be turbid and affecting subsequent detection. Secondly, when sampling the groundwater below, the sampling device needs to pass through the space above, thereby easily bringing the water or impurities in the upper layer to the groundwater in the lower layer through the sampling structure, thereby causing cross contamination of the groundwater.
[0003] Therefore, the present application provides a groundwater monitoring device for preventing cross contamination of groundwater. SUMMARY
[0004] In view of the deficiencies in the prior art, the present application aims to provide a groundwater monitoring device for preventing cross contamination of groundwater to solve the problems raised in the background art. The present application can isolate most of the silt through the filter cartridge, thereby preventing the mixing of silt in the sampling water and ensuring the purity of the sampling water, thereby ensuring the accuracy of the subsequent detection results. In addition, for the groundwater in the soil cracks, the filter cartridge can be used to directly control the groundwater, facilitating sampling and reducing the difficulty of sampling. The depth of sampling can be adjusted according to the number of sampling cylinders and the number of connecting cylinders, and simultaneous sampling at different depths can be performed. The sampling structure is not directly in contact with the groundwater at different depths before and after sampling, thereby preventing cross contamination of the groundwater and ensuring the purity of the groundwater. The sampling cylinder can be used alone for sampling, thereby making the device more flexible to use and expanding the application range of the device.
[0005] To achieve the above-mentioned purpose, the present application is implemented by the following technical solution: a groundwater monitoring device for preventing cross contamination of groundwater, comprising a filter cartridge, the filter cartridge is internally provided with a sampling structure, the sampling structure comprises a sampling cylinder and a connecting cylinder, a sealing structure is arranged between the sampling cylinder and the connecting cylinder, a fixing structure is arranged between the filter cartridge and the connecting cylinder at the top, a limiting structure is arranged in the filter cartridge, the limiting structure corresponds to the sampling cylinder, a water inlet structure is arranged in the sampling cylinder, a sampling structure is arranged in the sampling cylinder, and the sampling structure corresponds to the connecting cylinder and the water inlet structure.
[0006] Further, the filter cartridge is provided with a plurality of filter holes on the circumferential side, the fixing structure comprises a fixing frame fixed to the top of the filter cartridge, a plurality of positioning grooves are formed in the fixing frame, a fixing plate is fixed to the top connecting cylinder, a plurality of positioning rods are fixed to the fixing plate, and the positioning rods correspond to the positioning grooves.
[0007] Further, the two ends of the sampling cylinder and the two ends of the connecting cylinder are fixed with connecting flanges, the adjacent two connecting flanges are fixed and connected through bolts, one end of the sampling cylinder and the connecting cylinder is fixed with a sealing gasket, the other end of the sampling cylinder and the connecting cylinder is provided with a sealing groove corresponding to the sealing gasket.
[0008] Further, the water inlet structure comprises a rotating pipe rotatingly fitted in the sampling cylinder, a plurality of first water inlets are formed on the circumferential side of the sampling cylinder, a plurality of second water inlets are formed on the circumferential side of the rotating pipe, the second water inlets correspond to the first water inlets, a plurality of water outlets are formed on the circumferential side of the rotating pipe, the water outlets are communicated with the sampling cylinder, and a one-way valve is arranged in the water outlet.
[0009] Further, the sampling structure comprises a sampling pipe, first through grooves are formed on the upper and lower sides of the sampling cylinder, the first through grooves are communicated with the rotating pipe, the first through grooves correspond to the sampling pipe, a rubber ring is fixed in the first through groove, a blocking plate is threadedly fitted in the first through groove on the lower side, a scraping ring is fixed in the connecting cylinder, and the scraping ring corresponds to the sampling pipe.
[0010] Further, a first piston plate is slidingly fitted in the rotating pipe, the first piston plate corresponds to the sampling pipe, a second through groove is formed in the first piston plate, an elastic limiting plate is fixed in the second through groove, the elastic limiting plate corresponds to the sampling pipe, a sliding groove is formed in the rotating pipe, the sliding groove corresponds to the first piston plate, and the first piston plate corresponds to the water outlet.
[0011] Further, a plurality of sampling cavities are formed in the sampling pipe, a partition plate is fixed between adjacent two sampling cavities, a water pumping rod is slidingly fitted in the sampling pipe, the water pumping rod is fixedly connected with the partition plate, a sealing ring is slidingly fitted in the sampling cavity, the sealing ring is fixedly connected with the water pumping rod, a plurality of water inlets are formed on the circumferential side of the sampling cavity, and the water inlets correspond to the sealing ring.
[0012] Further, a second piston plate is slidingly fitted at the bottom of the sampling pipe, a limiting ring is fixed at the bottom of the sampling pipe, a plurality of springs are fixed between the limiting ring and the second piston plate, and the second piston plate is fixedly connected with the water pumping rod.
[0013] Further, a plurality of limiting rods are arranged in the filter cylinder, the limiting rods are rotatably connected with the cylinder wall of the filter cylinder, a torsional spring is fixed between the limiting rod and the filter cylinder, the limiting rod corresponds to the first water inlet, and the end of the limiting rod is made of elastic material.
[0014] Further, the side of the sampling cylinder is fixed with a pressure sensor, the top of the sampling pipe is fixed with a handle, and the end of the water pumping rod is fixed with a pulling plate.
[0015] Advantages of the present application: 1. The sampling structure is installed in the filter cartridge, which can first isolate most of the silt through the filter cartridge, thereby preventing silt from mixing into the sampling water, ensuring the purity of the sampling water, and ensuring the accuracy of the subsequent detection results, secondly, for groundwater in soil fissures, the filter cartridge can be used to directly control the groundwater, facilitating sampling and reducing the difficulty of sampling, and the sampling structure can be placed in the filter cartridge for a long time, facilitating monitoring of the groundwater level.
[0016] 2. The sealing structure is installed between the sampling cylinder and the connecting cylinder, the water inlet structure is installed in the sampling cylinder, and the sampling structure is installed in the sampling cylinder, which can first adjust the sampling depth according to the number of sampling cylinders and the number of connecting cylinders, and can simultaneously sample at different depths, and the sampling structure is not directly in contact with groundwater at different depths before and after sampling, thereby preventing cross-contamination of groundwater, ensuring the purity of the groundwater, and preventing different depths of groundwater from polluting the sampled sample water, thereby ensuring the accuracy of the monitoring results.
[0017] 3. The sampling cylinder can be used alone for sampling, thereby making the device more flexible to use and expanding the application range of the device, the fixing structure is installed between the filter cartridge and the connecting cylinder located at the top, and the limiting structure is installed in the filter cartridge, which can limit the position of the sampling cylinder, thereby achieving good sampling effect, and automatic sampling can be achieved through water pressure, making the device more convenient to use. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 It is an overall assembly perspective structure diagram of the underground water monitoring device for preventing cross-contamination of underground water of the present application; Figure 2 It is an overall assembly cross-sectional structure diagram of the underground water monitoring device for preventing cross-contamination of underground water of the present application; Figure 3 It is an assembly perspective structure diagram of the filter cartridge in the underground water monitoring device for preventing cross-contamination of underground water of the present application; Figure 4 It is an assembly perspective structure diagram of the sampling cylinder and the connecting cylinder in the underground water monitoring device for preventing cross-contamination of underground water of the present application; Figure 5 It is an assembly cross-sectional structure diagram of the filter cartridge in the underground water monitoring device for preventing cross-contamination of underground water of the present application; Figure 6It is the assembly profile structure schematic view of the sampling cylinder, the connecting cylinder in the groundwater monitoring device of the application for preventing groundwater cross contamination; Figure 7 It is the explosion view of the sampling cylinder in the groundwater monitoring device of the application for preventing groundwater cross contamination; Figure 8 It is the assembly profile structure schematic view of the sampling cylinder in the groundwater monitoring device of the application for preventing groundwater cross contamination; Figure 9 It is the assembly profile structure schematic view of the sampling cylinder in the groundwater monitoring device of the application for preventing groundwater cross contamination; Figure 10 It is the assembly profile structure schematic view of the connecting cylinder in the groundwater monitoring device of the application for preventing groundwater cross contamination; Figure 11 It is the assembly structure schematic view of the sampling pipe and the rotating pipe in the groundwater monitoring device of the application for preventing groundwater cross contamination; In the figure: 1, filter cylinder; 2, fixed frame; 3, filter hole; 4, limiting rod; 5, fixed plate; 6, positioning groove; 7, sampling cylinder; 8, connecting cylinder; 9, connecting flange; 10, scraping ring; 11, sealing groove; 12, sealing gasket; 13, first water inlet; 14, rotating pipe; 15, second water inlet; 16, sliding groove; 17, first piston plate; 18, baffle plate; 19, first through groove; 20, sampling pipe; 21, sampling cavity; 22, water inlet hole; 23, water pumping rod; 24, second piston plate; 25, spring; 26, sealing ring; 27, positioning rod; 28, water outlet; 29, one-way valve; 30, second through groove; 31, elastic limiting plate; 32, partition plate; 33, limiting ring; 34, pulling plate; 35, handle; 36, pressure sensor. DETAILED DESCRIPTION
[0019] In order to make the technical means, creative features, purposes and effects achieved by the application easy to understand, the application will be further described below in combination with specific embodiments.
[0020] Please refer to Figures 1 to 11 The application provides a technical scheme: a groundwater monitoring device for preventing groundwater cross contamination, comprising a filter cylinder 1, the filter cylinder 1 is internally provided with a sampling structure, the sampling structure comprises a sampling cylinder 7 and a connecting cylinder 8, the sampling cylinder 7 and the connecting cylinder 8 are provided with a sealing structure, the filter cylinder 1 and the connecting cylinder 8 located at the top are provided with a fixing structure, the filter cylinder 1 is internally provided with a limiting structure, the limiting structure corresponds to the sampling cylinder 7, the sampling cylinder 7 is internally provided with a water inlet structure, the sampling cylinder 7 is internally provided with a sampling structure, and the sampling structure corresponds to the connecting cylinder 8 and the water inlet structure.
[0021] The embodiment, the filter cartridge 1 is provided with a plurality of filter holes 3 on the circumferential side, the fixing structure includes a fixing frame 2 fixed to the top of the filter cartridge 1, a plurality of positioning grooves 6 are formed in the fixing frame 2, a fixing plate 5 is fixed on the connecting cylinder 8 at the top, a plurality of positioning rods 27 are fixed on the fixing plate 5, and the positioning rods 27 correspond to the positioning grooves 6.
[0022] Specifically, after drilling by the drilling machine, the filter cartridge 1 is fixed in the drilled hole, so that the underground water flows into the filter cartridge 1 through the filter holes 3, thereby forming a water well structure, facilitating subsequent sampling, preventing soil and the like from entering the underground water to be sampled, thereby ensuring the purity of the sampled water, and ensuring the accuracy of the final detection result.
[0023] The two ends of the sampling cylinder 7 and the two ends of the connecting cylinder 8 are fixed with connecting flanges 9, and the adjacent two connecting flanges 9 are fixed and connected through bolts, one end of the sampling cylinder 7 and the connecting cylinder 8 is fixed with a sealing gasket 12, and the other end of the sampling cylinder 7 and the connecting cylinder 8 is provided with a sealing groove 11, and the sealing groove 11 corresponds to the sealing gasket 12.
[0024] Specifically, when sampling is needed, a proper number of sampling cylinders 7 and connecting cylinders 8 can be selected as needed, and the sampling cylinder 7 and the connecting cylinder 8 are fixed and connected through the connecting flanges 9 and the bolts, when connected, the sealing gasket 12 is inserted into the sealing groove 11, thereby ensuring sealing, and then the sediment is poured into the filter cartridge 1, so that the sampling cylinder 7 sinks to the required depth, and then the positioning rod 27 on the topmost connecting cylinder 8 is clamped into the positioning groove 6, thereby realizing the fixing of the sampling cylinder 7 and the connecting cylinder 8, facilitating subsequent sampling, and the sampling cylinder 7 and the connecting cylinder 8 can be fixed in the filter cartridge 1 for a long time, thereby monitoring the water level, preventing cross contamination caused by the sliding of the sampling cylinder 7 and the connecting cylinder 8 in a short time, ensuring the purity of the underground water, preventing the underground water at different depths from mixing with each other, and thereby ensuring the accuracy of the detection result.
[0025] The water inlet structure includes a rotating pipe 14 rotatingly fitted in the sampling cylinder 7, a plurality of first water inlets 13 are formed on the circumferential side of the sampling cylinder 7, a plurality of second water inlets 15 are formed on the circumferential side of the rotating pipe 14, the second water inlets 15 correspond to the first water inlets 13, a plurality of water outlets 28 are formed on the circumferential side of the rotating pipe 14, the water outlets 28 communicate with the sampling cylinder 7, and a one-way valve 29 is arranged in the water outlet 28.
[0026] Specifically, when sampling is needed to be performed by using the sampling cylinder 7, the first water inlet 13 and the second water inlet 15 are communicated by rotating the rotating pipe 14, so that the underground water enters the sampling cylinder 7 under the action of water pressure, and then the rotating pipe 14 is rotated to dislocate the first water inlet 13 and the second water inlet 15, so that the rotating pipe 14 is in a sealed state, and the sampling is directly performed by using the sampling cylinder 7, so that the device has multiple sampling modes and the application range of the device is expanded.
[0027] The sampling structure comprises the sampling pipe 20, the first through slot 19 is arranged on the upper and lower sides of the sampling cylinder 7 and is communicated with the rotating pipe 14, the first through slot 19 corresponds to the sampling pipe 20, the rubber ring is fixed in the first through slot 19, the blocking plate 18 is threadedly connected in the first through slot 19 on the lower side, the scraping ring 10 is fixed in the connecting cylinder 8 and corresponds to the sampling pipe 20, the first piston plate 17 is slidably connected in the rotating pipe 14 and corresponds to the sampling pipe 20, the second through slot 30 is arranged in the first piston plate 17, the elastic limiting plate 31 is fixed in the second through slot 30 and corresponds to the sampling pipe 20, the sliding groove 16 is arranged in the rotating pipe 14 and corresponds to the first piston plate 17, the first piston plate 17 corresponds to the water outlet 28, the sampling pipe 20 is provided with the plurality of sampling cavities 21, the partition plate 32 is fixed between the adjacent two sampling cavities 21, the water pumping rod 23 is slidably connected in the sampling pipe 20 and is fixedly connected with the partition plate 32, the sealing ring 26 is slidably connected in the sampling cavity 21 and is fixedly connected with the water pumping rod 23, the plurality of water inlets 22 are arranged on the side of the sampling cavity 21 and correspond to the sealing ring 26, the second piston plate 24 is slidably connected at the bottom of the sampling pipe 20, the limiting ring 33 is fixed at the bottom of the sampling pipe 20, the plurality of springs 25 are fixed between the limiting ring 33 and the second piston plate 24, and the second piston plate 24 is fixedly connected with the water pumping rod 23.
[0028] Specifically, when sampling is performed using the sampling tube 20, the blocking plate 18 in the first through slot 19 is completely removed, on the basis that the sampling cylinder 7 and the connecting cylinder 8 are fixed by the fixing plate 5 and the fixing frame 2, the sampling tube 20 is inserted so that the sampling tube 20 passes through the first through slot 19, so that part of the sampling tube 20 enters the sampling cylinder 7, the sampling tube 20 is in sliding connection with the second through slot 30, the sampling tube 20 can slide in the second through slot 30 after overcoming the friction, the sampling tube 20 is limited by the second through slot 30 when rotating to drive the first piston plate 17 to rotate together, so that the sampling tube 20 is limited by the elastic limiting plate 31 when sliding downward, thereby pushing the first piston plate 17 to slide downward, so that the water remaining in the sampling cylinder 7 is squeezed out downward, so that the water in the sampling cylinder 7 is discharged from the water outlet 28, so that the sampling cylinder 7 is in a water-free state, when the sampling tube 20 is completely inserted, the sampling tube 20 can be rotated to drive the first piston plate 17 to rotate together, so that the first piston plate 17 drives the rotating tube 14 to rotate together, so that the first water inlet 13 is in communication with the second water inlet 15, at this time the water pressure at the bottom can push the second piston plate 24 upward, so that the second piston plate 24 drives the water pumping rod 23 to move upward, thereby reducing the force when manually pumping the water pumping rod 23 to pump water, reducing the difficulty of sampling, thereby improving the working efficiency of sampling, when the water pumping rod 23 slides upward, the water pumping rod 23 drives the sealing ring 26 to slide synchronously, so that the water inlet hole 22 is opened, so that the water in the sampling cylinder 7 enters the sampling cavity 21 through the water inlet hole 22, when sampling is completed, the sampling tube 20 is rotated, so that the first water inlet 13 is out of position with the second water inlet 15, so that the rotating tube 14 is not in communication with the outside, at this time the water pumping rod 23 is pushed downward, so that the water inlet hole 22 is sealed by the sealing ring 26, and because it is not in communication with the outside, it will not produce a large water pressure to make it difficult to push the water pumping rod 23, thereby sampling more easily, improving the efficiency of sampling, and during sampling, different heights of underground water can be sampled at one time, improving the efficiency of sampling, and during sampling, different heights of underground water will not affect each other, thereby preventing cross contamination of the sample water, thereby ensuring the accuracy of the final test result, preventing a large error in the test result, and the sliding of the sampling tube 20 is performed in the sampling cylinder 7 and the connecting cylinder 8, and during sliding, it will not cause stirring of the underground water, thereby preventing mixing of different heights of underground water, preventing cross contamination between the underground water, thereby ensuring the purity of the underground water, preventing mixing of the underground water before sampling, further ensuring the accuracy of the monitoring result.
[0029] A plurality of limiting rods 4 are arranged in the filter cartridge 1, the limiting rods 4 are rotatably connected to the upper and lower walls of the filter cartridge 1, a torsion spring is fixed between the limiting rods 4 and the filter cartridge 1, the limiting rods 4 correspond to the first water inlet 13, the end of the limiting rod 4 is made of elastic material, the side of the sampling cylinder 7 is fixed with a pressure sensor 36, the top of the sampling pipe 20 is fixed with a handle 35, and the end of the water pumping rod 23 is fixed with a pulling plate 34.
[0030] Specifically, when the sampling cylinder 7 is used for sampling alone, the sampling pipe 20 can be inserted into the sampling cylinder 7 in advance, and when the sampling cylinder 7 sinks to a certain depth, the sampling pipe 20 is rotated, and the sampling cylinder 7 is limited by the limiting rod 4, so that the sampling cylinder 7 cannot rotate with the rotation of the sampling pipe 20, and the sampling pipe 20 can drive the rotating pipe 14 to rotate, so that the first water inlet 13 and the second water inlet 15 are communicated, and sampling can be performed.
[0031] When the sampling pipe 20 is used for sampling alone, the sampling pipe 20 is inserted into the filter cartridge 1, and then the water pumping rod 23 is manually pulled to open the water inlet hole 22, although cross infection between underground water at different depths cannot be prevented, but for monitoring scenes with low requirements, one-time sampling of multiple different depths can be realized, thereby improving work efficiency, so that the device can flexibly adjust the sampling method according to actual needs, expand the application range of the device, and make the device more flexible to use.
[0032] Work flow: after the drilling is finished by the drilling machine, the filter cartridge 1 is fixed in the drilling hole, so that the underground water flows into the filter cartridge 1 through the filter hole 3, so that the filter cartridge 1 forms a water well structure, a proper number of sampling cartridges 7 and connecting cartridges 8 are selected according to the needs, the sampling cartridges 7 and the connecting cartridges 8 are fixed and connected through the connecting flanges 9 and bolts, when connected, the sealing gaskets 12 are inserted into the sealing grooves 11, so as to ensure sealing, then the sediment is poured into the filter cartridge 1, so that the sampling cartridge 7 sinks to the required depth, and then the positioning rod 27 on the topmost connecting cartridge 8 is clamped into the positioning groove 6, that is, the fixing of the sampling cartridge 7 and the connecting cartridge 8 is realized, when the sampling pipe 20 is used for sampling, the blocking plate 18 in the first through slot 19 is completely disassembled at this time, on the basis of the sampling cartridge 7 and the connecting cartridge 8 being fixed by the fixing plate 5 and the fixing frame 2, the sampling pipe 20 is inserted, so that the sampling pipe 20 passes through the first through slot 19, so that part of the sampling pipe 20 enters the sampling cartridge 7, and the sampling pipe 20 is limited by the elastic limiting plate 31 when sliding downward, so as to push the first piston plate 17 to slide downward relatively, so as to extrude the water remaining in the sampling cartridge 7 downward, so that the water in the sampling cartridge 7 is discharged from the water outlet 28, so that the sampling cartridge 7 is in a water-free state, when the sampling pipe 20 is completely inserted, the sampling pipe 20 can be rotated at this time, so as to drive the first piston plate 17 to rotate together, so that the first piston plate 17 drives the rotating pipe 14 to rotate together, so that the first water inlet 13 and the second water inlet 15 are communicated, at this time, the water pressure at the bottom can push the second piston plate 24 upward, so that the second piston plate 24 drives the water pumping rod 23 to move upward relatively, so as to reduce the force when manually pumping the water pumping rod 23, reduce the difficulty of sampling, and improve the working efficiency of sampling, when the water pumping rod 23 slides upward, the water pumping rod 23 will drive the sealing ring 26 to slide synchronously, so that the water inlet hole 22 is opened, so that the water in the sampling cartridge 7 enters the sampling cavity 21 through the water inlet hole 22, when the sampling is completed, the sampling pipe 20 is rotated at this time, so that the first water inlet 13 and the second water inlet 15 are out of position, so that the rotating pipe 14 is not connected with the outside, at this time, the water pumping rod 23 is pushed downward relatively, so that the water inlet hole 22 is sealed by the sealing ring 26, and because it is not connected with the outside, therefore, it will not produce a large water pressure to cause difficulty in pushing the water pumping rod 23, so as to sample more labor-savingly, improve the efficiency of sampling.
[0033] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.
Claims
1. A groundwater monitoring device for preventing cross contamination of groundwater, comprising a filter cartridge (1), characterized in that, The filter cartridge (1) is internally provided with a sampling structure, the sampling structure comprises a sampling cylinder (7) and a connecting cylinder (8), a sealing structure is arranged between the sampling cylinder (7) and the connecting cylinder (8), a fixing structure is arranged between the filter cartridge (1) and the connecting cylinder (8) at the top, a limiting structure is arranged in the filter cartridge (1) and corresponds to the sampling cylinder (7), a water inlet structure is arranged in the sampling cylinder (7), and a sampling structure is arranged in the sampling cylinder (7) and corresponds to the connecting cylinder (8) and the water inlet structure.
2. The groundwater monitoring device for preventing cross contamination of groundwater according to claim 1, wherein: A plurality of filter holes (3) are formed in the circumferential side of the filter cartridge (1), the fixing structure comprises a fixing frame (2) fixed to the top of the filter cartridge (1), a plurality of positioning grooves (6) are formed in the fixing frame (2), a fixing plate (5) is fixed to the topmost connecting cylinder (8), a plurality of positioning rods (27) are fixed to the fixing plate (5), and the positioning rods (27) correspond to the positioning grooves (6).
3. The groundwater monitoring device for preventing cross contamination of groundwater according to claim 1, wherein: The two ends of the sampling cylinder (7) and the two ends of the connecting cylinder (8) are fixedly provided with connecting flanges (9), the adjacent two connecting flanges (9) are fixedly connected through bolts, one end of the sampling cylinder (7) and the connecting cylinder (8) is fixedly provided with a sealing gasket (12), and the other end of the sampling cylinder (7) and the connecting cylinder (8) is provided with a sealing groove (11) corresponding to the sealing gasket (12).
4. The groundwater monitoring device for preventing cross contamination of groundwater according to claim 1, wherein: The water inlet structure comprises a rotating pipe (14) rotatably arranged in the sampling cylinder (7), a plurality of first water inlets (13) are formed in the circumferential side of the sampling cylinder (7), a plurality of second water inlets (15) are formed in the circumferential side of the rotating pipe (14), the second water inlets (15) correspond to the first water inlets (13), a plurality of water outlets (28) are formed in the circumferential side of the rotating pipe (14), the water outlets (28) are in communication with the sampling cylinder (7), and a one-way valve (29) is arranged in the water outlet (28).
5. The groundwater monitoring device for preventing cross contamination of groundwater according to claim 4, wherein: The sampling structure comprises a sampling pipe (20), first through grooves (19) are formed in the upper and lower sides of the sampling cylinder (7) and are in communication with the rotating pipe (14), the first through grooves (19) correspond to the sampling pipe (20), a rubber ring is fixedly arranged in the first through groove (19), a blocking plate (18) is threadedly arranged in the first through groove (19) on the lower side, a scraping ring (10) is fixedly arranged in the connecting cylinder (8) and corresponds to the sampling pipe (20).
6. The groundwater monitoring device for preventing cross contamination of groundwater according to claim 5, wherein: A first piston plate (17) is slidably arranged in the rotating pipe (14) and corresponds to the sampling pipe (20), a second through groove (30) is formed in the first piston plate (17), an elastic limiting plate (31) is fixedly arranged in the second through groove (30) and corresponds to the sampling pipe (20), a sliding groove (16) is formed in the rotating pipe (14) and corresponds to the first piston plate (17), and the first piston plate (17) corresponds to the water outlet (28).
7. The groundwater monitoring device for preventing cross contamination of groundwater according to claim 6, wherein: A plurality of sampling cavities (21) are arranged in the sampling tube (20), a partition plate (32) is fixed between two adjacent sampling cavities (21), a water pumping rod (23) is slidably arranged in the sampling tube (20), the water pumping rod (23) is fixedly connected with the partition plate (32), a sealing ring (26) is slidably arranged in the sampling cavity (21), the sealing ring (26) is fixedly connected with the water pumping rod (23), a plurality of water inlet holes (22) are arranged on the side of the sampling cavity (21), and the water inlet holes (22) correspond to the sealing ring (26).
8. The groundwater monitoring device for preventing cross contamination of groundwater according to claim 7, characterized in that: A second piston plate (24) is slidably arranged at the bottom of the sampling tube (20), a limiting ring (33) is fixed at the bottom of the sampling tube (20), a plurality of springs (25) are fixed between the limiting ring (33) and the second piston plate (24), and the second piston plate (24) is fixedly connected with the water pumping rod (23).
9. The groundwater monitoring device for preventing cross contamination of groundwater according to claim 4, wherein: A plurality of limiting rods (4) are arranged in the filter cartridge (1), the limiting rods (4) are rotatably connected with the wall of the filter cartridge (1) in an up-down mode, a torsion spring is fixed between the limiting rod (4) and the filter cartridge (1), the limiting rod (4) corresponds to the first water inlet (13), and the end of the limiting rod (4) is made of elastic material.
10. The groundwater monitoring device for preventing cross contamination of groundwater according to claim 1, wherein: A pressure sensor (36) is fixed on the side of the sampling cylinder (7), a handle (35) is fixed at the top of the sampling tube (20), and a pulling plate (34) is fixed at the end of the water pumping rod (23).