A groundwater sampling device for urban underground space aquifers

Abstract

The present invention discloses a groundwater sampling device for an aquifer in an urban underground space, belonging to the field of water sampling technology. The device comprises: an outer cylinder, a second one-way valve is provided at the top of which only allows the gas inside the outer cylinder to flow out; a sampling cylinder, a first one-way valve is provided at the top of which only allows the gas inside the sampling cylinder to flow out; and a filter assembly for filtering water, comprising a fixed cylinder and a sliding cylinder. The present invention can achieve the effect of sealing the filter assembly by providing vertically offset through holes on the fixed cylinder and the sliding cylinder, so that water cannot enter the filter assembly. When the sampling cylinder is at the sampling depth, the vertically offset first and second through holes overlap to open the filter assembly. Only then can water enter the filter assembly and then the sampling cylinder, thereby solving the problem of inaccurate sampling in the existing fixed-depth water sampling equipment.

Description

Technical Field

[0001] The invention relates to the technical field of water sampling, in particular to a groundwater sampling device for a water-bearing layer in an urban underground space. Background Art

[0002] During the development of urban underground space, it is necessary to conduct testing and research on the geological environment. Combined with the current status of underground space development in the study area and the results of influencing factors, the impact of urban underground space projects on physical fields such as stratum stress, seepage, and temperature under different development intensities and construction process conditions, as well as the impact of changes in geological environmental conditions on underground space projects, are studied and analyzed. The interaction mechanism between underground space development and geological environmental conditions is comprehensively analyzed.

[0003] When testing the quality of underground water, sampling is required first, and then water quality testing and analysis are performed. Most of the airbag pumps of groundwater samplers currently on the market suck the sampled water into a plastic hose for storage, and then send the sampled water out through the water outlet joint. In order to prevent the sampled water from being contaminated, the plastic hose is disposable. For example, the Chinese utility model patent with the authorization announcement number CN214742020U and the patent name of the airbag pump is such a method. In this patent, although the plastic hose is replaced to ensure that the sampled water will not be affected by the previous sampling, there is still a pump tube inserted into the plastic hose, and the pump tube will not be replaced, but reused. If handled improperly, the composition of the sampled water will be affected to a certain extent, resulting in the sampled water not being consistent with the in-situ water, thereby affecting the accuracy of the hydrogeological survey of groundwater.

[0004] A Chinese invention patent with application number CN202210601873.2 discloses a fixed-depth sampling device for groundwater in hydrogeological surveys. In this patent, an air pump is used to pump air to drive the piston to move, and then the telescopic collection bag is stretched to take samples, which can effectively avoid water sample contamination. However, this patent requires an air pump as a power source, so more equipment is carried in the sampling operation, such as an air pump, a power supply and other equipment, which is inconvenient. At the same time, when this patent is used, after the equipment is placed in the water body, the water will first enter the filter screen. If fixed-depth sampling is performed, part of the water at the highest water level will be brought into a deeper water position. Then, after the air pump is started for sampling, the high-water-level water will be mixed in, causing inaccurate sampling. Therefore, improvement is needed. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that the equipment for sampling water samples at a fixed depth in the prior art is prone to inaccurate sampling, and to propose a groundwater sampling device for aquifers in urban underground space.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A groundwater sampling device for an urban underground space aquifer, comprising:

[0008] The outer cylinder has a top end provided with a second one-way valve that only allows the gas inside the outer cylinder to flow out, and a bottom end that is open;

[0009] The sampling cylinder has a first one-way valve at its top that only allows the gas inside the sampling cylinder to flow out, and an opening at its bottom. The sampling cylinder is inserted into the outer cylinder and is detachably connected;

[0010] a valve assembly, which is detachably connected to the bottom end of the sampling cylinder and is used to close the bottom end of the sampling cylinder;

[0011] A filter assembly, which is used to filter water and includes a fixed cylinder and a sliding cylinder;

[0012] The fixed cylinder is fixedly connected to the valve assembly, and the valve assembly is located at the inner bottom of the fixed cylinder. A first through hole is opened at the lower part of the fixed cylinder;

[0013] The slide is slidably sleeved on the fixed cylinder, and the bottom end of the slide is fixedly connected to the valve stem in the valve assembly. A second through hole is opened at the lower part of the slide, and the first through hole and the second through hole are staggered in the upper and lower parts.

[0014] A driving assembly, which is used to push the slide cylinder and open the valve assembly, and is provided on the outer cylinder;

[0015] The protection component is arranged between the slide cylinder and the driving component and is used to connect the driving component and the slide cylinder.

[0016] Preferably, the valve assembly further comprises:

[0017] The valve body is fixedly arranged on the inner bottom surface of the fixed cylinder, and the top opening thereof is detachably connected to the bottom end of the sampling cylinder;

[0018] a partition fixedly disposed inside the valve body;

[0019] a third through hole, which is formed on the upper annular surface of the valve body and is higher than the partition;

[0020] The valve plate is fixedly mounted on the top of the valve stem and is used to close the top opening of the valve body;

[0021] The upper part of the valve stem is slidably connected to the partition, and the lower end passes through the bottom of the fixed cylinder and is fixedly connected to the inner bottom surface of the sliding cylinder;

[0022] The second elastic member is arranged at the inner lower part of the valve body and located below the partition plate, and is used for providing an upward force for the valve stem.

[0023] Preferably, the drive assembly includes a drive unit and a transmission unit, and the transmission unit includes:

[0024] A support, which is fixedly arranged on the outer ring surface of the outer cylinder;

[0025] A push rod, which is slidably arranged on a support;

[0026] A support block, which is fixedly arranged on the top surface of the outer cylinder;

[0027] a connecting rod, the middle portion of which is rotatably connected to the top end of the support block;

[0028] The top end of the push rod is rotatably connected to one end of the connecting rod.

[0029] Preferably, the transmission part further includes:

[0030] A bracket, which is fixedly arranged at the center of the top surface of the outer cylinder;

[0031] a slide plate, which is slidably arranged inside the bracket;

[0032] a first elastic member, which is arranged inside the bracket and above the slide, and provides a downward force for the slide;

[0033] One end of the fixed rod is fixedly arranged on the side of the slide plate, and the other end is rotatably connected to the other end of the connecting rod.

[0034] Preferably, the driving unit includes:

[0035] A sleeve wire, one end of which is fixedly arranged on the top end of the bracket;

[0036] A handle, the bottom end of which is fixedly connected to the other end of the sleeve line;

[0037] a pull handle, which is slidably disposed within the handle;

[0038] A drawstring is slidably arranged in the sleeve line, one end of the drawstring is fixedly connected to the slide plate, and the other end is fixedly connected to the handle.

[0039] Preferably, the cross sections of the fixed cylinder and the sliding cylinder are both stepped, and the step surface of the fixed cylinder is higher than the step surface of the sliding cylinder.

[0040] Preferably, the protection component includes:

[0041] A fixed plate is fixedly arranged on the upper inner wall of the slide, and the fixed plate is located above the step surface of the slide;

[0042] The slide rail is fixedly arranged on the bottom surface of the fixed plate.

[0043] Preferably, the protection component further includes:

[0044] A floating plate placed on the step surface inside the slide;

[0045] A slider, which is slidably arranged in the slide rail;

[0046] A connecting mechanism for driving the slider to move horizontally is provided between the floating plate and the slider.

[0047] Preferably, the connecting mechanism includes:

[0048] A chute, which is obliquely opened on the slider;

[0049] a fixed column, which is fixedly arranged on the floating plate;

[0050] The limiting column is fixedly arranged on the top end of the fixing column, and the limiting column is slidably arranged in the sliding groove.

[0051] Preferably, a vertical through groove is provided on the upper annular surface of the slide cylinder;

[0052] A fourth through hole is formed on the step surface of the slide cylinder.

[0053] Compared with the prior art, the present invention provides a groundwater sampling device for an urban underground space aquifer, which has the following beneficial effects.

[0054] 1. The present invention can achieve the effect of sealing the filter assembly by providing vertically offset through holes on the fixed cylinder and the sliding cylinder. At this time, water cannot enter the filter assembly. When the sampling cylinder is at the sampling depth, the vertically offset first through hole and the second through hole are overlapped to open the filter assembly. At this time, water can enter the filter assembly and then enter the sampling cylinder, thereby solving the problem of inaccurate sampling in the fixed depth water sampling equipment in the prior art.

[0055] 2. The present invention provides a sampling tube that can be inserted into the outer tube, and is equipped with a first one-way valve, a second one-way valve and a valve assembly. When the sampling tube is pulled back and forth in the outer tube, negative pressure can be generated inside the sampling tube. When sampling, the negative pressure inside the sampling tube can be used to suck water into the sampling tube to complete sampling, thereby achieving the effect of sampling without the need for an air pump to supply energy.

[0056] 3. The present invention provides a protective component to prevent the driving component from accidentally opening the valve component and the filter component when the device is placed in the water.

[0057] Other advantages, objects and features of the present invention will be set forth in part in the description which follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0059] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention.

[0060] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle.

[0061] Figure 4 For the present invention Figure 2 Enlarged structural diagram at point B in the middle.

[0062] Figure 5 It is a schematic structural diagram of the driving assembly and outer cylinder in the present invention.

[0063] Figure 6 It is a structural schematic diagram of the sampling tube in the present invention.

[0064] Figure 7 It is a structural schematic diagram of the filter component in the present invention.

[0065] Figure 8 It is a structural schematic diagram of the filter assembly and valve assembly in the present invention.

[0066] Figure 9 This is a schematic diagram of the split structure of the filter component in the present invention.

[0067] Figure 10 It is a structural schematic diagram of the slide in the present invention.

[0068] Figure 11 It is a structural schematic diagram of the floating plate in the present invention.

[0069] Figure 12 It is a structural schematic diagram of the slider in the present invention.

[0070] In the picture:

[0071] 1. Handle; 2. Pull handle; 3. Pull rope; 4. Sleeve; 5. Bracket; 6. Connecting rod; 7. Push rod; 8. Support; 9. Sampling tube; 10. Slide tube; 11. Fixed tube; 12. Screw; 13. Outer tube; 14. First elastic member; 15. First one-way valve; 16. Second one-way valve; 17. Valve body; 18. Fixed rod; 19. Slide plate; 20. Third through hole; 21. First through hole; 22. Valve plate; 23. Second elastic member; 24. Valve stem; 25. Partition plate; 26. Second through hole; 27. Floating plate; 28. Slider; 29. ​​Fixed plate; 30. Slide rail; 31. Through groove; 32. Fixed column; 33. Fourth through hole; 34. Limit column; 35. Slide groove; 36. Support block. DETAILED DESCRIPTION

[0072] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0073] Reference Figures 1-12As shown, a groundwater sampling device for an urban underground space aquifer comprises:

[0074] The outer tube 13 has a second one-way valve 16 at its top end, which only allows the gas inside the outer tube 13 to flow out, and an opening at its bottom end.

[0075] The sampling cylinder 9 has a first one-way valve 15 at its top end, which only allows the gas inside the sampling cylinder 9 to flow out. The bottom end is open. The sampling cylinder 9 is inserted into the outer cylinder 13 and is detachably connected.

[0076] The valve assembly is detachably connected to the bottom end of the sampling cylinder 9 and is used to close the bottom end of the sampling cylinder 9.

[0077] The filtering assembly is used for filtering water, and comprises a fixed cylinder 11 and a sliding cylinder 10 .

[0078] The fixed cylinder 11 is fixedly connected to the valve assembly, and the valve assembly is located at the inner bottom of the fixed cylinder 11 . A first through hole 21 is formed at the lower portion of the fixed cylinder 11 .

[0079] The slide 10 is slidably mounted on the fixed cylinder 11, and the bottom end of the slide 10 is fixedly connected to the valve stem 24 in the valve assembly. A second through hole 26 is opened at the lower part of the slide 10, and the first through hole 21 and the second through hole 26 are staggered in the upper and lower positions.

[0080] The driving assembly is used to push the slide 10 and open the valve assembly, and is disposed on the outer cylinder 13 .

[0081] The protection assembly is arranged between the slide 10 and the driving assembly, and is used to connect the driving assembly and the slide 10.

[0082] In a specific embodiment of the present invention, the outer diameter of the sampling tube 9 is the same as the inner diameter of the outer tube 13, and the sampling tube 9 can be inserted into the interior of the outer tube 13. When the sampling tube 9 is pulled back and forth in the outer tube 13, it can achieve an effect similar to that of a vacuum pump, and the gas in the sampling tube 9 can be extracted and a negative pressure can be generated inside it. When sampling, the negative pressure in the sampling tube 9 is used to suck the water into the sampling tube 9, thereby achieving the effect of quickly taking water samples without relying on an air pump. Therefore, when using this device for sampling, there is no need to carry equipment such as an air pump power supply, which greatly reduces the weight of the equipment carried; the valve assembly is used to close the bottom end of the sampling tube 9, and when extracting the gas inside the sampling tube 9, external gas is prevented from entering from the bottom end of the sampling tube 9. At the same time, when sampling, the effect of fixed depth sampling can be achieved, that is, the sampling tube 9 is placed at any position in the water body and then the valve assembly is opened for sampling. When the valve assembly is not opened, no water will be sucked in; the filter assembly is used to filter the water body to prevent large particles of soil and stones in the water body from clogging during sampling. The valve assembly and the filter assembly are composed of a fixed cylinder 11 and a sliding cylinder 10. When the first through hole 21 and the second through hole 26 are misaligned up and down, water cannot enter the interior of the fixed cylinder 11. Only when the first through hole 21 and the second through hole 26 coincide with each other, the water can pass through the second through hole 26 and the first through hole 21 and enter the interior of the fixed cylinder 11 and contact the valve assembly. Therefore, during the fixed depth sampling process, when the sampling cylinder 9 has not reached the specified depth, the water cannot enter the fixed cylinder 11, thereby avoiding the problem of mixing of water bodies at different depths; the driving assembly is used to drive the sliding cylinder 10 to move, thereby controlling the first through hole 21 and the second through hole 26 to be misaligned or coincident with each other up and down, and can also control the opening and closing of the valve assembly. When the valve assembly is in a closed state, the first through hole 21 and the second through hole 26 are in a state of being misaligned up and down, and when the valve assembly is in an open state, the first through hole 21 and the second through hole 26 are in a state of coincidence; the protective assembly is used to connect the driving assembly and the sliding cylinder 10, and the protective assembly is mainly used to prevent misoperation.

[0083] When vacuuming the sampling tube 9, first install the valve assembly to the bottom end of the sampling tube 9 to prevent external gas from entering the sampling tube 9 from here. After the above installation is completed, insert the sampling tube 9 into the outer tube 13. During the insertion process, since the first one-way valve 15 cannot intake air into the sampling tube 9, the sampling tube 9 at this time is equivalent to a piston that discharges the gas in the outer tube 13 out of the outer tube 13 through the second one-way valve 16, and then pulls the sampling tube 9 outward. During the pulling process, the second one-way valve 16 will prevent external gas from entering the outer tube 13. At this time, negative pressure will be generated inside the outer tube 13, so the gas in the sampling tube 9 will be sucked into the outer tube 13, and then the sampling tube 9 will be inserted inward and pulled out. Such a cycle can extract the gas in the sampling tube 9 to form a negative pressure.

[0084] The valve assembly also includes:

[0085] The valve body 17 is fixedly arranged on the inner bottom surface of the fixed cylinder 11, and its top opening is detachably connected to the bottom end of the sampling cylinder 9. In this solution, the valve body 17 and the sampling cylinder 9 are threadedly connected.

[0086] The partition plate 25 is fixedly disposed inside the valve body 17 .

[0087] The third through hole 20 is formed on the upper annular surface of the valve body 17 , and the third through hole 20 is higher than the partition plate 25 .

[0088] The valve plate 22 is fixedly disposed on the top end of the valve stem 24 and is used to close the top opening of the valve body 17 .

[0089] The upper portion of the valve stem 24 is slidably connected to the partition 25 , and the lower end thereof passes through the bottom of the fixed cylinder 11 and is fixedly connected to the inner bottom surface of the sliding cylinder 10 .

[0090] The second elastic member 23 is arranged at the inner lower part of the valve body 17 and is located below the partition 25. It is used to provide an upward force for the valve stem 24. A circular plate is fixedly provided at the middle and lower part of the valve stem 24, and the circular plate is located below the partition 25; the second elastic member 23 can be a spring, one end of which is fixedly connected to the inner bottom surface of the fixed cylinder 11, and the other end is fixedly connected to the circular plate. Under the elastic force of the spring, the valve stem 24 can move upward, so that the valve plate 22 closes the top of the valve body 17. At this time, since the bottom end of the valve stem 24 is fixedly connected to the slide cylinder 10, the inner bottom surface of the slide cylinder 10 is close to the bottom surface of the fixed cylinder 11.

[0091] When the valve assembly is in normal state, the valve stem 24 drives the valve plate 22 to close the valve body 17 under the action of the second elastic member 23, and the inner bottom surface of the slide cylinder 10 is close to the bottom surface of the fixed cylinder 11 under the action of the valve stem 24 and the second elastic member 23. At this time, the first through hole 21 and the second through hole 26 are misaligned up and down; when the valve assembly is opened, the drive assembly is used to drive the slide cylinder 10 to move downward, and then the slide cylinder 10 will drive the valve stem 24 to move downward after overcoming the force of the second elastic member 23, and then drive the valve plate 22 to move downward to open the top of the valve body 17. At this time, the first through hole 21 and the second through hole 26 coincide with each other. At this time, the water can enter the valve body 17 from the third through hole 20 after being filtered through the first through hole 21 and the second through hole 26, and then enter the sampling cylinder 9 from the top of the valve body 17.

[0092] The drive assembly includes a drive unit and a transmission unit. The transmission unit includes:

[0093] The support 8 is fixedly arranged on the outer circumferential surface of the outer cylinder 13 .

[0094] The push rod 7 is slidably arranged on the support 8, and the push rod 7 can move up and down on the support 8.

[0095] The support block 36 is fixedly disposed on the top surface of the outer cylinder 13 .

[0096] The middle portion of the connecting rod 6 is rotatably connected to the top end of the supporting block 36 .

[0097] The top end of the push rod 7 is rotatably connected to one end of the connecting rod 6; a straight slot is provided at the end of the connecting rod 6, and a cylinder is fixedly provided at the top end of the push rod 7, and the cylinder is located inside the straight slot. When the middle part of the connecting rod 6 rotates around the support block 36, it can drive the push rod 7 to move up and down.

[0098] The transmission unit also includes:

[0099] The bracket 5 is fixedly arranged at the center of the top surface of the outer cylinder 13 .

[0100] The slide plate 19 is slidably arranged inside the bracket 5 .

[0101] The first elastic member 14 is arranged inside the bracket 5 and above the slide 19 to provide a downward force for the slide 19; the first elastic member 14 can be a spring, one end of which is fixedly connected to the inner top of the bracket 5, and the other end is fixedly connected to the slide 19.

[0102] One end of the fixed rod 18 is fixedly set on the side of the slide 19, and the other end is rotatably connected to the other end of the connecting rod 6; a cylinder is fixedly set on the end of the fixed rod 18 connected to the connecting rod 6, and a straight slot is opened on the end of the connecting rod 6 connected to the fixed rod 18, and the cylinder on the fixed rod 18 is located in the straight slot.

[0103] When the transmission part is in normal state, the slide plate 19 is moved close to the outer cylinder 13 under the elastic force of the first elastic member 14. At this time, the end of the connecting rod 6 connected to the fixed rod 18 will move downward under the drive of the slide plate 19, and then the end of the connecting rod 6 connected to the push rod 7 will be tilted, and then drive the push rod 7 to move upward; when the driving part starts to work, the slide plate 19 will overcome the force of the first elastic member 14 and move upward, thereby causing the end of the connecting rod 6 connected to the fixed rod 18 to move upward, and then causing the end of the connecting rod 6 connected to the push rod 7 to move downward, causing the push rod 7 to move downward.

[0104] The drive unit includes:

[0105] One end of the sleeve line 4 is fixedly arranged on the top end of the bracket 5, and the sleeve line 4 is used to send the sampling tube 9 into the sampling water area.

[0106] The bottom end of the handle 1 is fixedly connected to the other end of the sleeve wire 4.

[0107] The handle 2 is slidably arranged in the handle 1.

[0108] The pull rope 3 is slidably arranged in the sleeve 4. One end of the pull rope 3 is fixedly connected to the slide plate 19, and the other end is fixedly connected to the handle 2.

[0109] When the driving part is in use, the handle 2 is pulled away from the position of the sleeve line 4. At this time, the pull rope 3 will be pulled by the handle 2, so that the slide plate 19 is pulled by the pull rope 3 to overcome the elastic force of the first elastic member 14 and move upward, thereby causing the push rod 7 to move downward.

[0110] The cross sections of the fixed cylinder 11 and the slide cylinder 10 are both stepped, and the step surface of the fixed cylinder 11 is higher than the step surface of the slide cylinder 10 . The protection component is arranged in the area between the step surfaces of the fixed cylinder 11 and the slide cylinder 10 .

[0111] Protection components include:

[0112] The fixing plate 29 is fixedly disposed on the upper inner wall of the slide 10 , and the fixing plate 29 is located above the step surface of the slide 10 .

[0113] The slide rail 30 is fixedly arranged on the bottom surface of the fixing plate 29 .

[0114] The protection components also include:

[0115] The floating plate 27 is placed on the step surface inside the slide 10 and can move upward due to the buoyancy of water.

[0116] The slider 28 is slidably arranged in the slide rail 30 .

[0117] A connecting mechanism is provided between the floating plate 27 and the slider 28 for driving the slider 28 to move horizontally.

[0118] The connection mechanism includes:

[0119] The sliding groove 35 is obliquely provided on the slider 28 .

[0120] The fixed column 32 is fixedly arranged on the floating plate 27 .

[0121] The limiting post 34 is fixedly disposed on the top end of the fixing post 32 and is slidably disposed in the sliding groove 35 .

[0122] A vertical through slot 31 is provided on the upper annular surface of the slide 10 . The width of the through slot 31 is greater than the width of the slider 28 . The slider 28 can enter the through slot 31 and be pushed by the push rod 7 during horizontal movement.

[0123] A fourth through hole 33 is defined on the stepped surface of the slide 10 .

[0124] When the protective assembly is in normal state, the floating plate 27 falls on the step surface of the slide 10 under the action of gravity, and the limiting column 34 is also located at the lowest point of the slide groove 35. At this time, the slider 28 is retracted into the slide rail 30, that is, the slider 28 is not located below the push rod 7. In this state, the drive assembly is in a failed state, that is, the drive assembly cannot be used to drive the slide 10 to move. This setting can avoid the problem that when the outer cylinder 13 and the sampling cylinder 9 are sent into the sampling water area, the filter assembly and the valve assembly are opened due to misoperation when they are not in contact with the water body, resulting in the sampling cylinder 9 only inhaling gas. When the outer cylinder 13 and the sampling cylinder 9 are sent into the water body, water will enter the slide 10 through the fourth through hole 33, and the floating plate 27 will move upward due to the buoyancy of the water. During the upward movement, the limiting column 34 will also move upward, and then under the action of the oblique slide groove 35, the slider 28 can be driven to move outward along the slide rail 30, so that the slider 28 can be located below the push rod 7. At this time, the drive assembly can be used to drive the slide 10 to move.

[0125] Working process: First, vacuum the sampling tube 9. When vacuuming, first install the valve assembly to the bottom end of the sampling tube 9, that is, connect the top end of the valve body 17 with the bottom end of the sampling tube 9, and use the valve assembly to seal the bottom end of the sampling tube 9. Then, insert the sampling tube 9 into the outer tube 13 and perform reciprocating motion to extract the gas inside the sampling tube 9 and form a negative pressure. After the above operation is completed, use the screw 12 to fix the sampling tube 9 and the outer tube 13 (the state at this time can be referred to Figure 1 and Figure 2), after the fixation is completed, the staff uses the sleeve line 4 to send the outer tube 13 and the sampling tube 9 into the sampling area. Before reaching the water area, the slider 28 is located in the slide rail 30. At this time, the push rod 7 cannot push the slider 28, acting as a safety. When it reaches the specified depth, the float 27 moves upward due to the buoyancy of the water, thereby causing the limit column 34 to move upward, and the inclined slide groove 35 can be used to move the slider 28 outward, so that the slider 28 moves to the position below the push rod 7, and a part of the slider 28 is still located in the slide rail 30. At this time, the handle 2 is pulled and the pull rope 3 is used to drive the slide plate 19 to move upward. At this time, the end of the connecting rod 6 connected to the fixed rod 18 moves upward, and the other end moves downward to drive the push rod 7 downward. During the downward movement, The slider 28 is pushed downward, and the slide rail 30 is driven to move downward. Since the slide rail 30 is fixedly connected to the slide cylinder 10 through the fixing plate 29, the slide cylinder 10 is moved downward, so that the first through hole 21 and the second through hole 26 coincide with each other. At the same time, when the slide cylinder 10 moves downward, the valve stem 24 is driven downward, and then the valve assembly is opened, so that the bottom end of the sampling cylinder 9 is opened, and then the water is sucked into the sampling cylinder 9 due to the negative pressure of the sampling cylinder 9. After sampling, the handle 2 is released, the push rod 7 moves upward, and the slide cylinder 10 is reset under the action of the second elastic member 23, and the valve assembly and the filter assembly are reclosed. Then, the outer cylinder 13 and the sampling cylinder 9 are lifted upward using the sleeve line 4. After the outer cylinder 13 and the sampling cylinder 9 are lifted to the ground, the screw 12 is unscrewed. The sampling tube 9 is pulled out from the outer tube 13. In order to facilitate the extraction of the sampling tube 9, an air vent can be set at the top of the outer tube 13, which is usually closed with a bolt. When the sampling tube 9 is taken out, the bolt is unscrewed to leak the air vent. Due to the existence of the air vent, gas can enter the outer tube 13 when the sampling tube 9 is taken out, so that the sampling tube 9 can be easily taken out. At this point, one sampling is completed. If sampling needs to be continued, a new sampling tube 9 and the matching filter assembly and valve assembly can be replaced for sampling. The used sampling tube 9, filter assembly and valve assembly are uniformly taken back for cleaning for next use. In summary, the device can achieve fixed-depth sampling and is not easy to mix with water bodies of different water levels, thereby ensuring sampling accuracy. When sampling multiple times, , will not be affected by the previous sampling, further improving the sampling accuracy; when sampling, due to the built-in air extraction function, there is no need to carry additional air pumps, cables and power equipment, reducing the amount of equipment carried; in the sampling process, due to the provision of a protective component, it is possible to avoid accidentally opening the filter component and the valve component when lowering the equipment, thereby avoiding the sampling tube 9 sucking in air and causing the problem of being unable to suck in water later; in addition, the sampling tube 9 and the outer tube 13 in the present device are detachably connected, and the sampling tube 9 and the valve component are also detachably connected, which can achieve the effect of easy disassembly and replacement. At the same time, the sampling tube 9, the valve component and the protective component can be recycled after cleaning after use, reducing resource waste.

[0126] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

[0127] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0128] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A groundwater sampling device for an urban underground space aquifer, characterized in that: include: The outer cylinder (13) has a top end provided with a second one-way valve (16) for allowing only the gas inside the outer cylinder (13) to flow outward, and a bottom end that is open; The sampling cylinder (9) has a first one-way valve (15) at its top end for allowing only the gas inside the sampling cylinder (9) to flow outward, and an opening at its bottom end. The sampling cylinder (9) is inserted into the outer cylinder (13) and is detachably connected; A valve assembly, which is detachably connected to the bottom end of the sampling cylinder (9) and is used to close the bottom end of the sampling cylinder (9); A filter assembly for filtering water, comprising a fixed cylinder (11) and a sliding cylinder (10); The fixed cylinder (11) is fixedly connected to the valve assembly, and the valve assembly is located at the inner bottom of the fixed cylinder (11). A first through hole (21) is opened at the lower part of the fixed cylinder (11); The slide cylinder (10) is slidably sleeved on the fixed cylinder (11), and the bottom end of the slide cylinder (10) is fixedly connected to the valve stem (24) in the valve assembly. A second through hole (26) is opened at the lower part of the slide cylinder (10), and the first through hole (21) and the second through hole (26) are staggered in the upper and lower parts. A driving assembly, which is used to push the slide cylinder (10) and open the valve assembly, and is arranged on the outer cylinder (13); A protective assembly is provided between the slide (10) and the drive assembly and is used to connect the drive assembly and the slide (10), and comprises: A fixed plate (29) is fixedly arranged on the upper inner wall of the slide cylinder (10), and the fixed plate (29) is located above the step surface of the slide cylinder (10); A slide rail (30) fixedly disposed on the bottom surface of the fixed plate (29); A floating plate (27) is placed on a stepped surface inside the slide cylinder (10); A slider (28) slidably disposed within a slide rail (30); A connecting mechanism for driving the slider (28) to move horizontally is provided between the floating plate (27) and the slider (28); The connecting mechanism comprises: A chute (35) is obliquely provided on the slider (28); A fixed column (32) fixedly mounted on the floating plate (27); The limiting column (34) is fixedly arranged on the top end of the fixing column (32), and the limiting column (34) is slidably arranged in the sliding groove (35).

2. The groundwater sampling device for urban underground space aquifers according to claim 1, characterized in that: The valve assembly further comprises: A valve body (17) is fixedly arranged on the inner bottom surface of the fixed cylinder (11), and its top opening is detachably connected to the bottom end of the sampling cylinder (9); a partition (25) fixedly disposed inside the valve body (17); A third through hole (20) is provided on the upper annular surface of the valve body (17), and the third through hole (20) is higher than the partition (25); a valve plate (22) fixedly disposed on the top end of the valve stem (24) and used to close the top opening of the valve body (17); The upper portion of the valve stem (24) is slidably connected to the partition (25), and the lower end thereof passes through the bottom of the fixed cylinder (11) and is fixedly connected to the inner bottom surface of the sliding cylinder (10); The second elastic member (23) is arranged at the inner lower part of the valve body (17) and below the partition (25), and is used to provide an upward force for the valve stem (24).

3. The groundwater sampling device for urban underground space aquifers according to claim 2, characterized in that: The drive assembly includes a driving part and a transmission part, and the transmission part includes: A support (8) fixedly disposed on the outer annular surface of the outer cylinder (13); A push rod (7) slidably mounted on a support (8); A support block (36) fixedly disposed on the top surface of the outer cylinder (13); A connecting rod (6), the middle portion of which is rotatably connected to the top end of the support block (36); The top end of the push rod (7) is rotatably connected to one end of the connecting rod (6).

4. The groundwater sampling device for urban underground space aquifers according to claim 3, characterized in that: The transmission unit further includes: A bracket (5) is fixedly arranged at the center of the top surface of the outer cylinder (13); A slide plate (19) slidably disposed inside the bracket (5); A first elastic member (14) is disposed inside the bracket (5) and above the slide plate (19) to provide a downward force for the slide plate (19); A fixed rod (18) has one end fixedly arranged on the side of the slide plate (19) and the other end rotatably connected to the other end of the connecting rod (6).

5. The groundwater sampling device for urban underground space aquifers according to claim 4, characterized in that: The driving unit includes: A sleeve wire (4), one end of which is fixedly mounted on the top of the bracket (5); A handle (1), the bottom end of which is fixedly connected to the other end of the sleeve wire (4); A handle (2) is slidably disposed within the handle (1); A pull rope (3) is slidably arranged in the sleeve line (4), one end of the pull rope (3) is fixedly connected to the slide plate (19), and the other end is fixedly connected to the handle (2).

6. The groundwater sampling device for urban underground space aquifers according to claim 3, characterized in that: The cross sections of the fixed cylinder (11) and the sliding cylinder (10) are both stepped, and the step surface of the fixed cylinder (11) is higher than the step surface of the sliding cylinder (10).

7. The groundwater sampling device for urban underground space aquifers according to claim 1, characterized in that: A vertical through groove (31) is provided on the upper annular surface of the slide cylinder (10); A fourth through hole (33) is provided on the step surface of the slide cylinder (10).

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