Groundwater sample collection device and collection method

Abstract

The present invention relates to the field of groundwater collection, and in particular to a groundwater sample collection device and a collection method; wherein the groundwater sample collection device comprises a collection tank, an air inlet, a one-way air valve, a collection bottle, a collection hole, a filter hole, a counterweight and a closing component, and the present invention can solve the following problems existing in the prior art in the process of groundwater sample collection: it is necessary to carry a variety of devices and then assemble them before collecting groundwater, which is inconvenient to carry and has a complicated use process; it is impossible to seal the groundwater after collection, so that the groundwater contacts with the air after collection, affecting the detection result; the present invention forms a negative pressure state in the collection tank by pre-evacuating air, so that when actually collecting groundwater, there is no need to carry additional auxiliary devices such as an air pump, a tripod and a water pump, thereby simplifying the operation process and making it more convenient and efficient; the present invention can prevent air from entering through the collection bottle, thereby ensuring the accuracy of the test results of the collected groundwater samples.

Description

Technical Field

[0001] The invention relates to the field of groundwater collection, and in particular to a groundwater sample collection device and a collection method. Background Art

[0002] Groundwater quality monitoring is an important part of environmental science. Existing groundwater sampling devices usually include a sampling tube and a manual or electric pump, which pumps water from underground to the ground for collection. However, using the above equipment to collect groundwater requires operators to have certain skills and experience to ensure correct and safe use. In addition, since groundwater may contain various dissolved gases and microorganisms, these substances may react with air during the collection process, affecting the accuracy of the test results.

[0003] A large number of groundwater sample collection and corresponding devices are also disclosed in the prior art. For example, a Chinese patent with publication number CN116124526A discloses a groundwater sample collection device and a collection method, which include a first expandable water plug, a second expandable water plug, a porous anti-blocking water inlet pipe, an air pump, and a water pump; the air pump is connected to the first expandable water plug through a long flexible air pipe, and the water pump is connected to the first expandable water plug through a long flexible water pipe; a short flexible air duct and a porous anti-blocking water inlet pipe are arranged between the first expandable water plug and the second expandable water plug.

[0004] When in use, the air pump, air pressure measuring instrument, water pump, flow tester, exhaust valve, drain valve and sampling valve are placed at corresponding positions on the ground, and the air outlet end of the long flexible air pipe and the water outlet end of the long flexible water pipe are respectively connected to the first flexible air pipe of the first expandable water shutoff device and the upper end of the first rigid water pipe. The air pump and the water pump are started to pump out groundwater through the water inlet hole, the anti-blocking water inlet pipe, the first rigid water pipe and the long flexible water pipe.

[0005] However, in the process of collecting groundwater samples using the above-mentioned existing technology, there are still the following shortcomings: 1. In actual use, the above-mentioned existing technology needs to first transport multiple devices, such as the first expandable water shutoff device, the second expandable water shutoff device, the porous anti-clogging water inlet pipe, the air pump and the water pump, to the vicinity of the groundwater borehole to be collected, and then assemble them before collecting groundwater. It is inconvenient to carry and the use process is complicated.

[0006] 2. Some special groundwater may contain various dissolved gases and microorganisms. These substances may react when in contact with air during the collection process. However, in actual use, the above-mentioned existing technology cannot seal the groundwater after collection, so that the groundwater may react when in contact with air after collection, thereby affecting the detection results.

[0007] Therefore, based on the above-stated viewpoint, there is still room for improvement in the existing groundwater collection methods. Summary of the invention

[0008] In order to solve the above problems, the present invention provides a groundwater sample collection device, including a collection tank, an air inlet hole is provided at the upper end of the collection tank, a one-way air valve is installed in the air inlet hole, a mounting hole is provided at the upper end of the collection tank, a collection bottle for collecting groundwater is installed inside the mounting hole, a plurality of clamping grooves for connecting the collection bottle and the collection tank are provided on the inner wall of the mounting hole, and a plurality of collection holes are provided on the outer wall of the collection tank;

[0009] The diameter of the collecting hole gradually decreases from the inside of the collecting tank to the outside of the collecting tank, and a sliding piston is connected to the collecting hole;

[0010] The outer wall of the collecting bottle is provided with a filter hole for filtering the collected groundwater, the inner wall of the collecting bottle is slidably connected with a sealing ring for sealing the filter hole, a counterweight block for assisting the collection tank to descend in the groundwater is installed at the bottom of the collection tank, and a closing component for controlling the automatic opening and closing of the collection hole is installed in the collection hole.

[0011] Preferably, the upper end of the collecting bottle is connected to a sealing cover, the outer wall of the sealing cover is connected to a clamping block located in the clamping groove, a handle is installed on the upper end of the sealing cover, and a partition is installed on the bottom of the sealing cover.

[0012] Preferably, the upper end of the partition is provided with a plurality of through grooves, the outer wall of the sealing cover is provided with a plurality of through grooves, the upper end of the sealing ring is connected to a connecting rod sliding in the through groove, and the upper end of the connecting rod is connected to a sliding rod sliding in the through groove.

[0013] Preferably, a plurality of sliding grooves are provided on the inner wall of the mounting hole, and the sliding grooves are divided into vertical grooves, inclined grooves and transverse grooves. The transverse grooves are arranged horizontally along the inner wall of the mounting hole, and the vertical grooves are arranged along the axial direction of the mounting hole. The upper end of the vertical groove is connected to the outside, one end of the inclined groove is connected to the transverse groove, and the other end gradually tilts upward and is connected to the bottom of the inclined groove. The sliding rod passes through the through groove and then slides in the sliding groove.

[0014] Preferably, the sliding piston is connected to a cylindrical rod on the side away from the collecting tank, the cylindrical rod is connected to a baffle on the side away from the collecting tank, and a return spring is installed between the baffle and the collecting tank.

[0015] Preferably, the closing assembly includes an annular groove formed on the outer wall of the sliding piston, and the inner wall of the collection tank is rotatably connected to two buckles symmetrically arranged along the sliding piston. A semicircular groove for limiting the sliding piston is formed on the side of the buckle close to the sliding piston, and the semicircular groove cooperates with the annular groove.

[0016] Preferably, the closing assembly also includes two trigger holes opened at the bottom of the counterweight block, and a hinged rod is installed on the side of the buckle close to the axis of the collection tank. The hinged rods on the two adjacent buckles are commonly connected to a T-shaped rod, and the T-shaped rod slides in the trigger hole, and a pad is connected to the bottom of the T-shaped rod, and the pad is located outside the collection tank.

[0017] In addition, the present invention also provides a method for collecting groundwater samples, comprising the following steps: S1: vacuuming: first, vacuum the collection tank from the air inlet through a vacuum pump to change the air pressure in the collection tank to a negative pressure, then tie the collection tank with a rope, and then place the collection tank into the groundwater well to be collected.

[0018] S2: Groundwater collection: During the descent of the collection tank, when the collection tank descends to the bottom, the negative pressure in the collection tank and the external water pressure cause the collection hole to open automatically, and the groundwater enters the collection tank under the action of negative pressure, and then enters the collection bottle after being filtered.

[0019] S3: Groundwater sealing: After the collection is completed, the collection tank is pulled out of the water surface, and the sealing cover is turned by the handle to seal the collection bottle and separate it from the collection tank, so as to take out the groundwater that needs to be collected.

[0020] In summary, this application includes the following beneficial technical effects:

[0021] 1. The present invention forms a negative pressure state in the collection tank by pre-evacuating air, so that there is no need to carry additional auxiliary devices such as an air pump, a tripod and a water pump when actually collecting groundwater, which simplifies the operation process, greatly reduces the carrying burden, and makes on-site operations more convenient and efficient.

[0022] 2. After the collection tank is pulled out of the water by a rope, the present invention can safely take out the collection bottle without exposing it to the external environment by rotating the sealing cover and the sealing ring, thereby preventing the gas and microorganisms in the air from contaminating the sample. The sealing ring seals the filter hole after the collection bottle is taken out, ensuring that the collected groundwater sample will not be affected by external factors before testing, thereby ensuring the accuracy of the test results.

[0023] 3. In the present invention, when the collection tank is lowered to the bottom of the well, the negative pressure in the collection tank and the external water pressure are combined to enable the sliding piston to automatically open the collection hole, thereby ensuring that groundwater can smoothly enter the collection tank under the action of negative pressure. Subsequently, the sliding piston is automatically sealed under the action of the return spring to ensure that the groundwater in the collection tank will not be lost or contaminated due to improper operation, thereby reducing the possibility of human operation errors and improving the safety and reliability of sample collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0025] Figure 1 It is a structural schematic diagram of the present invention.

[0026] Figure 2 It is a schematic diagram of the structure between the collecting tank and the collecting bottle of the present invention.

[0027] Figure 3 It is a structural schematic diagram of the collection tank of the present invention.

[0028] Figure 4 It is a schematic structural diagram of the collecting bottle of the present invention.

[0029] Figure 5 It is a schematic diagram of the structure between the sliding rod and the sliding groove of the present invention.

[0030] Figure 6 It is a first structural schematic diagram of the closing assembly of the present invention.

[0031] Figure 7 It is a second structural schematic diagram of the closing assembly of the present invention.

[0032] In the figure, 1. collection tank; 11. air inlet; 12. one-way air valve; 13. collection hole; 14. counterweight; 15. mounting hole; 16. snap-in groove; 17. sliding groove; 171. vertical groove; 172. inclined groove; 173. horizontal groove; 2. collection bottle; 20. sliding rod; 21. filter hole; 22. sealing cover; 23. snap-in block; 24. handle; 25. partition; 26. sealing ring; 27. penetration groove; 28. through groove; 29. ​​connecting rod; 3. closing assembly; 31. sliding piston; 32. cylindrical rod; 33. baffle; 34. reset spring; 35. annular groove; 36. buckle; 37. semicircular groove; 38. trigger hole; 39. hinged rod; 40. T-bar; 41. pad. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-Figure 7 Embodiments of the present invention are described in detail.

[0034] The embodiment of the present application discloses a groundwater sample collection device. It should be noted that the groundwater sample collection device of the present application is mainly used in the process of groundwater collection. In terms of technical effect, it can filter groundwater during the groundwater collection process to prevent mud and sand contained in the groundwater from entering, thereby affecting the subsequent detection of the groundwater. Especially after the collection is completed, the collected groundwater can be sealed to prevent the groundwater from changing due to contact with the air and affecting the detection results. Furthermore, the local groundwater sample collection device is easy to carry, does not require multiple devices to be assembled and used, and is easy to operate.

[0035] Reference Figure 1 and Figure 2As shown, a groundwater sample collection device includes a collection tank 1, an air inlet 11 is opened at the upper end of the collection tank 1, a one-way air valve 12 is installed in the air inlet 11, a collection bottle 2 for collecting groundwater is installed in the middle of the collection tank 1, a plurality of collection holes 13 are opened on the outer wall of the collection tank 1, a filter hole 21 for filtering the collected groundwater is opened on the outer wall of the collection bottle 2, a counterweight block 14 for assisting the collection tank 1 to descend in the groundwater is installed at the bottom of the collection tank 1, a closing component 3 for controlling the automatic opening and closing of the collection hole 13 is installed in the collection hole 13, and a rope for hoisting the collection tank 1 and dropping it into a groundwater well is connected to the upper end of the collection bottle 2.

[0036] It should be noted that when the collection tank 1 falls in the groundwater, it always falls vertically under the action of the gravity of the counterweight 14, thereby ensuring that the bottom of the collection tank 1 can contact the bottom of the groundwater well.

[0037] In the specific implementation process, first, air is pumped from the air inlet 11 to the collection tank 1 through an air pump (the air pump used in this embodiment is a prior art and will not be described in detail here), so that the air pressure state in the collection tank 1 becomes negative pressure, and the collection tank 1 is tied with a rope, and then the collection tank 1 is placed in the groundwater well to be collected, and descends under the gravity of the collection tank 1 and the counterweight block 14. In addition, since the collection tank 1 is in a negative pressure state, its buoyancy is small, thereby accelerating the descent speed of the collection tank 1 and the depth of the water layer that the collection tank 1 can reach; when the collection tank 1 reaches the bottom of the groundwater well, the closing component 3 controls the collection hole 13 to open, and the groundwater flows into the collection tank 1 from the collection hole 13 under the action of the negative pressure inside the collection tank 1, and then when the water level inside the collection tank 1 reaches the height of the filter hole 21, the groundwater is filtered through the filter hole 21 and enters the collection bottle 2, thereby preventing the mud and sand in the groundwater from entering the collection bottle 2.

[0038] When the water level of groundwater entering the collection tank 1 reaches a certain height, the groundwater enters the interior of the collection bottle 2 from the upper end thereof. At this time, the collection tank 1 is no longer in a negative pressure state. Subsequently, the closing component 3 controls the collection hole 13 to close, and the collection tank 1 is pulled by a rope. After the collection tank 1 is pulled out of the water, the collection bottle 2 is rotated to take it out as a whole together with the groundwater sample inside it, thereby completing the groundwater sample collection. In addition, by evacuating the collection tank 1 in advance, when groundwater needs to be collected, only the collection tank 1 and the rope need to be carried, without the need to carry auxiliary devices such as an air pump, a tripod and a water pump, thereby facilitating carrying.

[0039] Reference Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, in order to keep the collection bottle 2 in a sealed state to prevent air from entering during the process of collecting groundwater, based on this, in this example, a mounting hole 15 for mounting the collection bottle 2 is opened at the upper end of the collection tank 1, and a plurality of clamping grooves 16 for connecting the collection bottle 2 and the collection tank 1 are opened on the inner wall of the mounting hole 15, and a sealing cover 22 is connected to the upper end of the collection bottle 2, and a clamping block 23 located in the clamping groove 16 is connected to the outer wall of the sealing cover 22, and a handle 24 is installed at the upper end of the sealing cover 22, and a partition 25 is installed at the bottom of the sealing cover 22. The snap-in groove 16 is divided into a vertical section and a horizontal section. When the snap-in block 23 is located in the horizontal section of the snap-in groove 16, sealing is achieved, so that a seal is formed between the sealing cover 22 and the collection jar 1. A sealing ring 26 for blocking the filter hole 21 is slidably connected to the inner wall of the collecting bottle 2. A plurality of through grooves 27 are provided at the upper end of the partition 25. A plurality of through grooves 28 are provided on the outer wall of the sealing cover 22. A connecting rod 29 sliding in the through groove 27 is connected to the upper end of the sealing ring 26. A sliding rod 20 sliding in the through groove 28 is connected to the upper end of the connecting rod 29.

[0040] Furthermore, in the present embodiment, a plurality of circumferentially distributed sliding grooves 17 are provided on the inner wall of the mounting hole 15. The sliding grooves 17 are divided into a vertical groove 171, an inclined groove 172 and a transverse groove 173. The transverse groove 173 is horizontally arranged, and the vertical groove 171 is arranged along the axial direction of the mounting hole 15. The upper end of the vertical groove 171 is connected to the outside, one end of the inclined groove 172 is connected to the transverse groove 173, and the other end gradually tilts upward and is connected to the bottom of the inclined groove 172. The sliding rod 20 passes through the through groove 28 and slides in the sliding groove 17.

[0041] In the specific implementation process, after the collection tank 1 is pulled out of the water, the sealing cover 22 is rotated by the handle 24, and the sealing cover 22 drives the clamping block 23 and the collecting bottle 2 to rotate, and the clamping block 23 slides along the horizontal section of the clamping groove 16 to the vertical section, so that the sealing cover 22 loses its limit; in the process of rotating the sealing cover 22, the sealing cover 22 drives the sliding rod 20 to rotate, and the sliding rod 20 slides along the transverse groove 173 and moves into the inclined groove 172, and then the sliding rod 20 gradually slides upward along the inclined groove 172 and the through groove 28, and the connecting rod 29 slides upward inside the through groove 27 under the limit of the through groove 27, and drives the sealing ring 26 to move upward synchronously, so as to The filter hole 21 is sealed; when the sliding rod 20 slides to the uppermost end of the inclined groove 172, the sliding rod 20 and the snap-in block 23 are respectively located in the vertical sections of the vertical groove 171 and the snap-in groove 16, and at this time, the handle 24 is pulled upward, and the sliding rod 20 and the snap-in block 23 slide upward along the vertical groove 171 and the snap-in groove 16 respectively, and then the collecting bottle 2 can be taken out; after the collecting bottle 2 is taken out, the sealing ring 26 seals the filter hole 21 to prevent air from entering the collecting bottle 2 from the filter hole 21, causing the collected groundwater to contain various dissolved gases and microorganisms to change when in contact with the air, and finally affecting the accuracy of the groundwater test results.

[0042] When using the collection tank 1 again, grasp the handle 24, and then insert the collection bottle 2 into the collection tank 1. It is necessary to pay attention to align the snap-fit ​​block 23 with the snap-fit ​​groove 16, and then rotate the handle 24 so that the snap-fit ​​block 23 is screwed into the horizontal section of the snap-fit ​​groove 16 to achieve locking; at the same time, during the locking process, the sliding rod 20 slides down along the vertical groove 171, and then the handle 24 is rotated to drive the sealing cover 22 and the sliding rod 20 to rotate, so that the sliding rod 20 gradually slides downward along the inclined groove 172 into the transverse groove 173. During the sliding downward sliding of the sliding rod 20 along the inclined groove 172, the sealing ring 26 is driven downward by the connecting rod 29 to slide, so that the filter hole 21 is opened, so that the groundwater in the collection tank 1 can enter the collection bottle 2 through the filter hole 21 during the subsequent collection process.

[0043] Reference Figure 2 , Figure 6 and Figure 7 As shown, in order to enable the collecting hole 13 to open and close automatically during the groundwater collection process and to close automatically after the groundwater collection is completed, so that the inside of the collecting tank 1 is in a sealed state, a closing component 3 is provided in the present embodiment; specifically, the diameter of the collecting hole 13 gradually decreases from the inside of the collecting tank 1 to the outside of the collecting tank 1, a sliding piston 31 is connected to the collecting hole 13, a cylindrical rod 32 is connected to the side of the sliding piston 31 away from the collecting tank 1, a baffle 33 is connected to the side of the cylindrical rod 32 away from the collecting tank 1, and a return spring 34 is installed between the baffle 33 and the collecting tank 1.

[0044] Further, in the present embodiment, the closing component 3 includes an annular groove 35 provided on the outer wall of the sliding piston 31, and the inner wall of the collection tank 1 is rotatably connected to two buckles 36 symmetrically arranged along the sliding piston 31, and the lower end of the buckle 36 is rotatably connected to the collection tank 1 through a pin shaft, and the buckle 36 is provided with a semicircular groove 37 for limiting the sliding piston 31 on the side close to the sliding piston 31, and the semicircular groove 37 cooperates with the annular groove 35. The closing component 3 also includes two trigger holes 38 provided at the bottom of the counterweight block 14, and the buckle 36 is rotatably connected to a hinged rod 39 on the side close to the axis of the collection tank 1, and the hinged rods 39 on the two adjacent buckles 36 are rotatably connected to a T-bar 40 together, and the T-bar 40 slides in the trigger hole 38, and the bottom of the T-bar 40 is located outside the collection tank 1 and is connected to a pad 41.

[0045] In the initial state, the sliding piston 31 is located in the collecting hole 13 and seals it. The two hinged rods 39 and the T-bar 40 are hinged for a section that gradually tilts downward, and the buckle 36 is engaged with the annular groove 35, so that the sliding piston 31 overcomes the negative pressure closure inside the collection tank 1. Therefore, when the collection tank 1 moves downward in the groundwater well, the pad first contacts the bottom of the groundwater well, and the pad 41 and the T-bar 40 move into the collection tank 1 under the weight pressure of the counterweight block 14 and the collection tank 1. As a result, the two hinged rods 39 are driven to gradually tend to the horizontal during the rising process of the T-bar 40, and the two buckles 36 are pushed to open.

[0046] It should be noted that the return spring 34 always provides a force to drive the baffle 33, the cylindrical rod 32 and the sliding piston 31 to move toward the side close to the axis of the collection tank 1, thereby ensuring that the sliding piston 31 seals the collection hole 13 after the negative pressure inside the collection tank 1 is reduced.

[0047] In a specific implementation process, when the collection tank 1 descends to the bottom of the groundwater well, the pad 41 and the T-bar 40 slide upward along the trigger hole 38 under the weight of the collection tank 1 and the counterweight 14. The T-bar 40 drives the hinged rod 39 to rotate during the rising process, and the hinged rod 39 drives the two buckles 36 to move backward, so that the sliding piston 31 loses its limit. Since the collection tank 1 is in a negative pressure state, the sliding piston 31 moves into the collection tank 1 under the suction force in the collection tank 1 and the squeezing of the external groundwater, and the reset spring 34 shrinks adaptively, and prevents the sliding piston 31 from completely entering the collection tank 1 through the baffle 33. Subsequently, the groundwater is sucked out from the collection hole 13 under the suction force of the collection tank 1. Entering into the collection tank 1, as the groundwater gradually enters the collection tank 1, the negative pressure in the collection tank 1 gradually decreases. When the negative pressure decreases to a specified level, the sliding piston 31 enters the collection hole 13 again under the elastic force of the return spring 34 to seal it. When the collection tank 1 is pulled up, the T-bar 40 descends under the gravity of the pad 41 and pulls the two hinged rods 39. The two hinged rods 39 drive the two buckles 36 to rotate toward each other, so that the semicircular groove 37 on the buckle 36 cooperates with the annular groove 35 again, so that the buckle 36 limits the sliding piston 31, preventing air from entering the collection tank 1 after the groundwater in the collection tank 1 flows out, and entering the collection bottle 2 from the filter hole 21 to affect the subsequent groundwater detection results.

[0048] In addition, the present invention also provides a method for collecting groundwater samples, comprising the following steps: S1, vacuuming: first, vacuuming the collection tank 1 from the air inlet 11 through a vacuum pump, so that the air pressure state in the collection tank 1 becomes negative pressure, and the collection tank 1 is tied with a rope, and then the collection tank 1 is placed in the groundwater well to be collected, and descends under the gravity of the collection tank 1 and the counterweight block 14. In addition, since the collection tank 1 is in a negative pressure state, its buoyancy is small, thereby accelerating the descent speed of the collection tank 1 and the depth to which the collection tank 1 can reach the water layer.

[0049] S2. Groundwater collection: When the collection tank 1 descends to the bottom of the groundwater well, the pad 41 and the T-bar 40 slide upward along the trigger hole 38 under the weight of the collection tank 1 and the counterweight 14. The T-bar 40 drives the hinged rod 39 to rotate during the ascending process, and the hinged rod 39 drives the two buckles 36 to move backward, so that the sliding piston 31 loses its limit. Since the collection tank 1 is in a negative pressure state, the sliding piston 31 moves into the collection tank 1 under the suction force in the collection tank 1 and the squeezing of the external groundwater, and the reset spring 34 shrinks adaptively, and the baffle 33 blocks the sliding piston 31 from completely entering the collection tank 1. Then, the groundwater enters the collection tank 1 from the collection hole 13 under the suction force of the collection tank 1. When the groundwater flows into the collecting tank 1, the negative pressure in the collecting tank 1 gradually decreases. When the negative pressure decreases to a specified level, the sliding piston 31 enters the collecting hole 13 again under the elastic force of the reset spring 34 to seal it. When the collecting tank 1 is pulled up, the T-bar 40 descends under the gravity of the pad 41 and pulls the two hinged rods 39. The two hinged rods 39 drive the two buckles 36 to rotate toward each other, so that the semicircular groove 37 on the buckle 36 cooperates with the annular groove 35 again, so that the buckle 36 limits the sliding piston 31, preventing air from entering the collecting tank 1 after the groundwater flows out of the collecting tank 1, and entering the collecting bottle 2 from the filter hole 21 to affect the subsequent detection results of the groundwater.

[0050] S3. Groundwater sealing: After the collection is completed, the collection tank 1 is pulled out of the water, and the sealing cover 22 is rotated by the handle 24. The sealing cover 22 drives the clamping block 23 and the collecting bottle 2 to rotate, and the clamping block 23 slides along the horizontal section of the clamping groove 16 to the vertical section, so that the sealing cover 22 loses its limit; in the process of rotating the sealing cover 22, the sealing cover 22 drives the sliding rod 20 to rotate, and the sliding rod 20 slides along the transverse groove 173 and moves into the inclined groove 172, and then the sliding rod 20 gradually slides upward along the inclined groove 172 and the through groove 28, and the connecting rod 29 slides upward inside the through groove 27 under the limit of the through groove 27, and drives the sealing ring 26 to move upward synchronously, Thereby, the filter hole 21 is sealed; when the sliding rod 20 slides to the uppermost end of the inclined groove 172, the sliding rod 20 and the snap-in block 23 are respectively located in the vertical sections of the vertical groove 171 and the snap-in groove 16, and at this time, the handle 24 is pulled upward, and the sliding rod 20 and the snap-in block 23 slide upward along the vertical groove 171 and the snap-in groove 16 respectively, and then the collecting bottle 2 can be taken out; after the collecting bottle 2 is taken out, the sealing ring 26 seals the filter hole 21 to prevent air from entering the collecting bottle 2 from the filter hole 21, resulting in the collected groundwater containing various dissolved gases and microorganisms changing due to contact with air, and finally affecting the accuracy of the groundwater test results.

[0051] When using the collection tank 1 again, grasp the handle 24, and then insert the collection bottle 2 into the collection tank 1. It is necessary to pay attention to align the snap-fit ​​block 23 with the snap-fit ​​groove 16, and then rotate the handle 24 so that the snap-fit ​​block 23 is screwed into the horizontal section of the snap-fit ​​groove 16 to achieve locking; at the same time, during the locking process, the sliding rod 20 slides down along the vertical groove 171, and then the handle 24 is rotated to drive the sealing cover 22 and the sliding rod 20 to rotate, so that the sliding rod 20 gradually slides downward along the inclined groove 172 into the transverse groove 173. During the sliding downward sliding of the sliding rod 20 along the inclined groove 172, the sealing ring 26 is driven downward by the connecting rod 29 to slide, so that the filter hole 21 is opened, so that the groundwater in the collection tank 1 can enter the collection bottle 2 through the filter hole 21 during the subsequent collection process.

[0052] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A groundwater sample collection device, comprising a collection tank (1), an air inlet (11) being provided at the upper end of the collection tank (1), a one-way air valve (12) being installed in the air inlet (11), characterized in that: The collection tank (1) has a mounting hole (15) at its upper end, a collection bottle (2) for collecting groundwater is mounted inside the mounting hole (15), a plurality of snap-in grooves (16) for connecting the collection bottle (2) and the collection tank (1) are formed on the inner wall of the mounting hole (15), and a plurality of collection holes (13) are formed on the outer wall of the collection tank (1); The diameter of the collecting hole (13) gradually decreases from the inside of the collecting tank (1) to the outside of the collecting tank (1), and a sliding piston (31) is connected to the collecting hole (13); The outer wall of the collecting bottle (2) is provided with a filter hole (21) for filtering the collected groundwater, the inner wall of the collecting bottle (2) is slidably connected with a sealing ring (26) for blocking the filter hole (21), the bottom of the collecting tank (1) is provided with a counterweight (14) for assisting the collecting tank (1) to descend in the groundwater, and a closing component (3) for controlling the automatic opening and closing of the collecting hole (13) is provided in the collecting hole (13); The upper end of the collecting bottle (2) is connected to a sealing cover (22); the outer wall of the sealing cover (22) is connected to a clamping block (23) located in the clamping groove (16); the upper end of the sealing cover (22) is provided with a handle (24); the bottom of the sealing cover (22) is provided with a partition (25); the clamping groove (16) is divided into a vertical section and a horizontal section; when the clamping block (23) is located in the horizontal section of the clamping groove (16), sealing is achieved, so that a seal is formed between the sealing cover (22) and the collecting jar (1); The partition plate (25) has a plurality of through grooves (27) at its upper end, the sealing cover (22) has a plurality of through grooves (28) at its outer wall, the sealing ring (26) has a connecting rod (29) at its upper end that slides in the through grooves (27), and the connecting rod (29) has a sliding rod (20) at its upper end that slides in the through grooves (28); The inner wall of the mounting hole (15) is provided with a plurality of sliding grooves (17), the sliding grooves (17) being divided into a vertical groove (171), an inclined groove (172) and a transverse groove (173), the transverse groove (173) being arranged horizontally along the inner wall of the mounting hole (15), the vertical groove (171) being arranged along the axial direction of the mounting hole (15), and the upper end of the vertical groove (171) being connected to the outside, one end of the inclined groove (172) being connected to the transverse groove (173), and the other end being gradually inclined upward and connected to the bottom of the inclined groove (172), and the sliding rod (20) passing through the through groove (28) and then sliding in the sliding groove (17); After the collection tank (1) is pulled out of the water, the sealing cover (22) is rotated by the handle (24), and the sealing cover (22) drives the clamping block (23) and the collection bottle (2) to rotate, and the clamping block (23) slides along the horizontal section of the clamping groove (16) to the vertical section, so that the sealing cover (22) loses its limit position; in the process of rotating the sealing cover (22), the sealing cover (22) drives the sliding rod (20) to rotate, and the sliding rod (20) slides along the transverse groove (173) and moves into the inclined groove (172), and then the sliding rod (20) gradually slides upward along the inclined groove (172) and the through groove (28), and the connecting rod (29) is inserted into the through groove ( When the sliding rod (20) slides to the uppermost end of the inclined groove (172), the sliding rod (20) and the clamping block (23) are respectively located in the vertical sections of the vertical groove (171) and the clamping groove (16). At this time, the handle (24) is pulled upward, and the sliding rod (20) and the clamping block (23) slide upward along the vertical groove (171) and the clamping groove (16), respectively. Then, the collecting bottle (2) can be taken out, so that the sealing ring (26) can seal the filtering hole (21) after the collecting bottle (2) is taken out.

2. A groundwater sample collection device according to claim 1, characterized in that: The side of the sliding piston (31) away from the collection tank (1) is connected to a cylindrical rod (32), the side of the cylindrical rod (32) away from the collection tank (1) is connected to a baffle (33), and a return spring (34) is installed between the baffle (33) and the collection tank (1).

3. A groundwater sample collection device according to claim 2, characterized in that: The closing component (3) comprises an annular groove (35) formed on the outer wall of the sliding piston (31); the inner wall of the collection tank (1) is rotatably connected to two buckles (36) symmetrically arranged along the sliding piston (31); a semicircular groove (37) for limiting the position of the sliding piston (31) is formed on one side of the buckle (36) close to the sliding piston (31); the semicircular groove (37) cooperates with the annular groove (35); The closing assembly (3) further comprises two trigger holes (38) formed at the bottom of the counterweight (14); a hinged rod (39) is installed on one side of the buckle (36) close to the axis of the collection tank (1); the hinged rods (39) on two adjacent buckles (36) are connected to a T-shaped rod (40); the T-shaped rod (40) is slidable in the trigger hole (38); and a pad (41) is connected to the bottom of the T-shaped rod (40); the pad (41) is located outside the collection tank (1).

4. A method for collecting groundwater samples, using a groundwater sample collecting device as described in any one of claims 1 to 3, characterized in that: The collection method includes the following steps: S1: Pumping air: First, the air is pumped out of the collection tank (1) from the air inlet (11) by means of an air pump, so that the air pressure in the collection tank (1) becomes negative pressure, and then the collection tank (1) is tied with a rope, and then the collection tank (1) is placed in the groundwater well to be collected; S2: Groundwater collection: During the descent of the collection tank (1), when the collection tank (1) reaches the bottom, the negative pressure in the collection tank (1) and the external water pressure cause the collection hole (13) to open automatically, and groundwater enters the collection tank (1) under the negative pressure, and then enters the collection bottle (2) after being filtered; S3: Groundwater sealing: After the collection is completed, the collection tank (1) is pulled out of the water surface, and the sealing cover (22) is rotated by the handle (24) so ​​that the collection bottle (2) is sealed and separated from the collection tank (1), thereby taking out the groundwater to be collected.

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