Portable groundwater rapid sampling and in-situ filtration device

Abstract

The utility model discloses a portable groundwater rapid sampling and in-situ filtering device belongs to groundwater sampling device technical field. Portable groundwater rapid sampling and in-situ filtering device, including filter drum and winding device, the filter drum lower extreme is provided with the counterweight head of water inlet hole, and the filter drum inside is equipped with filter core, and the upper end of filter drum is detachably connected with sampling pipe. The utility model discloses through the filter core is built -in in the filter drum that can work underwater, and utilizes the electric drive assembly integrated in the sampling pipe to produce negative pressure suction directly at the sampling point, so that water sample is sealed and preserved in the sampling pipe after entering aquifer immediately, this maximally reduces the contact of water sample and air and the change of water quality in the transportation process, guarantees the authenticity and accuracy of dissolved component analysis result.

Description

Technical Field

[0001] This utility model relates to the technical field of groundwater sampling devices, and more specifically, to a portable groundwater rapid sampling and in-situ filtration device. Background Technology

[0002] Currently, common groundwater sampling methods often employ simple instruments such as Bayler tubes. This traditional method has significant drawbacks: First, during storage, transportation, and waiting for laboratory filtration, particulate matter and microorganisms in the water continuously undergo physical, chemical, and biological reactions, leading to changes in the water sample composition. This severely affects the determination of the true concentration of dissolved pollutants and fails to reflect the in-situ water quality at the moment of sampling. Second, the operation process is cumbersome, time-consuming, and labor-intensive, and the exposure of samples to air and transfer containers easily introduces secondary pollution. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and to provide a portable groundwater rapid sampling and in-situ filtration device to solve the above-mentioned shortcomings.

[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0005] A portable groundwater rapid sampling and in-situ filtration device includes a filter cartridge and a cable reel. The lower end of the filter cartridge is equipped with a counterweight head with a water inlet. The filter cartridge contains a filter element, and the upper end of the filter cartridge is detachably connected to a sampling tube. The sampling tube contains a piston that can slide along the tube wall and a piston rod connected to the piston. A drive assembly is provided inside the sampling tube to drive the piston rod to move linearly, so that the piston moves inside the sampling tube and generates negative pressure. The cable reel is connected to the piston rod via a cable.

[0006] Preferably, the lower end of the filter cylinder is provided with a first threaded port, the upper end of the filter cylinder is provided with a second threaded port, the counterweight head is detachably connected to the lower end of the filter cylinder through the first threaded port, the sampling tube is detachably connected to the second threaded port through the mounting port at its end, and at least one sealing ring is provided at the connection between the mounting port and the second threaded port.

[0007] Preferably, a primary filter screen is provided at the water inlet.

[0008] Preferably, the inner wall of the mounting port of the sampling tube is provided with a limiting ring to limit the stroke of the piston, and a sealing ring is also provided between the limiting ring and the end face of the second threaded port.

[0009] Preferably, an exhaust valve is provided at the top of the sampling tube.

[0010] Preferably, the drive assembly includes a waterproof micro motor, a power communication module, a drive gear, and a transmission gear. The power communication module supplies power to the waterproof micro motor and receives control signals. The output end of the waterproof micro motor is connected to the drive gear, which meshes with the transmission gear. The transmission gear meshes with the piston rod via a thread. The radial rotation of the piston rod is restricted by the sampling tube, thus converting the rotational motion of the transmission gear into the linear motion of the piston rod.

[0011] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0012] This utility model discloses a portable groundwater rapid sampling and in-situ filtration device. By embedding the filter element inside a filter cylinder that can operate underwater, and utilizing an electric drive component integrated into the sampling tube to directly generate negative pressure suction at the sampling point, the water sample is immediately filtered and sealed in the sampling tube after entering the aquifer. This minimizes the contact between the water sample and air and the changes in water quality during transportation, ensuring the authenticity and accuracy of the dissolved component analysis results. The device adopts a modular design, with the filter cylinder, counterweight head, and sampling tube connected by threads, making disassembly and assembly convenient. The entire system has a compact structure and is retracted using a reel, making it suitable for field transport and operation. The connection between the sampling tube and the filter cylinder uses a double sealing ring design, combined with the sealing effect of the piston, to form a fully enclosed structure from water inlet to storage. The counterweight head has a detachable structure, can be easily replaced, and has strong versatility. Attached Figure Description

[0013] Figure 1 This is a structural diagram of the portable groundwater rapid sampling and in-situ filtration device of this utility model;

[0014] Figure 2 This is an exploded view of the filter cartridge, counterweight head, and sampling tube of this utility model;

[0015] Figure 3 This is a structural diagram showing the connection between the filter cartridge, counterweight head, and sampling tube of this utility model.

[0016] Figure 4 This is an enlarged view of section A of this utility model.

[0017] In the diagram: 1. Filter cylinder; 11. First threaded port; 12. Filter element; 13. Second threaded port; 14. Sealing ring; 2. Counterweight head; 21. Water inlet cover; 211. Water inlet hole; 212. Primary filter screen; 3. Sampling tube; 31. Limiting ring; 32. Piston; 321. Piston rod; 322. Pull ring; 33. Exhaust valve; 34. Drive assembly; 341. Waterproof micro motor; 342. Power communication module; 343. Drive gear; 344. Transmission gear; 4. Cable reel. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings.

[0020] Combination Figures 1-4 The portable groundwater rapid sampling and in-situ filtration device of this utility model includes a filter cylinder 1. A counterweight head 2 and a sampling tube 3 are respectively connected to the two ends of the filter cylinder 1. Groundwater enters the filter cylinder 1 from one end of the counterweight head 2. After being filtered by the filter cylinder 1, it enters the sampling tube 3. One end of the sampling tube 3 is connected to a cable reel 4 through a cable.

[0021] Specifically, the lower end of the filter cylinder 1 is provided with a first threaded port 11, which engages with the counterweight head 2. The counterweight head 2 is provided with a water inlet cover 21, and the upper end of the water inlet cover 21 engages with the first threaded port 11 through a thread. The counterweight head 2 adopts a detachable structure, and the specifications of the counterweight head 2 can be adjusted according to the water quality and depth of the sampled water. In addition, the water inlet cover 21 is provided with annularly distributed water inlet holes 211, and a primary filter screen 212 is provided on the water inlet holes 211 to block sand and gravel. When the filter cylinder 1 is placed into the test water well, the counterweight head 2 drives the filter cylinder 1 to sink in a vertical state, and water enters the filter cylinder 1 from the water inlet holes 211. During the process, some air will be discharged from the filter cylinder 1 from the water inlet holes 211.

[0022] The filter cylinder 1 is equipped with a filter element 12. Water entering the filter cylinder 1 gradually fills the filter cylinder 1. During the process, it is filtered by at least two filter elements 12 inside the filter cylinder 1 to remove impurities. The upper end of the filter cylinder 1 is provided with a second threaded port 13, which engages with the sampling tube 3.

[0023] More specifically, one end of the sampling tube 3 is provided with an installation port that engages with the second threaded port 13. A limit ring 31 is provided on the inner wall of the sampling tube 3 near the installation port. After the installation port engages with the second threaded port 13, the limit ring 31 abuts against the second threaded port 13. A sealing ring 14 is provided at the connection between the limit ring 31 and the second threaded port 13. Similarly, a sealing ring 14 is also provided at the end of the second threaded port 13 and the installation port. Through two layers of sealing, external water is prevented from entering the sampling tube 3 from the connection between the installation port and the second threaded port 13. A piston 32 is provided inside the sampling tube 3. Under the action of the limit ring 31, the piston 32 cannot be detached from the sampling tube 3. The piston rod 321 on one side of the piston 32 passes through the sampling tube 3 and is connected to a pull ring 322. The pull ring 322 is connected to the cable through a buckle. The cable is wound on the reel 4. The sampling tube 3, the filter cylinder 1, and the cable adopt a detachable structure, which facilitates sampling after sampling.

[0024] It is important to understand that the top of the sampling tube 3 is equipped with an exhaust valve 33, and the connection between the piston rod 321 and the sampling tube 3 is equipped with a drive assembly 34. The drive assembly 34 includes a waterproof micro motor 341, a power communication module 342, a drive gear 343, and a transmission gear 344. The power communication module 342 receives signals from the shore and supplies power to the waterproof micro motor 341. It is composed of a low-power microcontroller, such as the STM32L4 series, and an independent power management circuit with fine control by the MCU. The waterproof micro motor 341 drives the transmission gear 344 to rotate through the drive gear 343. The transmission gear 344 is sleeved with the piston rod 321, and the piston rod 321 meshes with the transmission gear 344. The sampling tube 3 restricts the up and down movement of the piston rod 321. When the transmission gear 344 rotates, it drives the piston rod 321 to move its position. When collecting water samples, the waterproof micro motor 341 works, driving the piston rod 321 to move upward. The air in the sampling tube 3 is discharged through the exhaust valve 33, and then the water in the filter cylinder 1 quickly enters the sampling tube 3. The sampling tube 3 and the filter cylinder 1 are then lifted out of the well through the cable. The filter cylinder 1 is inverted, the counterweight head 2 is kept upward, and the sampling tube 3 is unscrewed to obtain the sampled water.

[0025] Working Process: Based on the depth of the monitoring well and sampling requirements, select a suitable counterweight head 2 and a filter element 12 with appropriate filtration precision. Connect the counterweight head 2, filter cylinder 1, and sampling tube 3 sequentially via threads and tighten them, ensuring that the sealing rings 14 at each interface form an effective seal. Check and ensure that the exhaust valve 33 at the top of the sampling tube 3 is closed. Release the cable using the cable reel 4 and slowly lower the assembled device to the predetermined sampling depth in the monitoring well. During this process, the counterweight head 2 ensures that the device remains vertically lowered. Under hydrostatic pressure, groundwater enters through the water inlet 211 of the counterweight head 2. After passing through the primary filter screen 212 to block large particles of impurities, it fills the filter cylinder 1. Air inside the filter cylinder 1 is expelled through the water inlet 211 during the water intake process. After the device reaches the designated depth and stabilizes, a start command is sent to the power communication module 342 of the drive assembly 34 via the wires built into the cable or an independent signal line. The output shaft of the waterproof micro motor 341 drives the drive gear 343 to rotate, which in turn drives the transmission gear 344 meshing with it to rotate. Since the transmission gear 344 and the piston rod 321 are threadedly engaged, and the radial rotation of the piston rod 321 is restricted by the wall of the sampling tube 3, the rotational motion of the transmission gear 344 is converted into the linear motion of the piston rod 321, driving the piston 32 to move stably upward within the sampling tube 3. When the piston 32 moves upward, a negative pressure is formed in the cavity of the sampling tube 3 below it. This negative pressure is transmitted to the interior of the filter cartridge 1 through the through hole in the center of the limiting ring 31. Under the suction of negative pressure, the clean water sample that has been filtered in situ by the filter element 12 inside the filter cartridge 1 is quickly sucked into the cavity of the sampling tube 3. At the same time, the air in the cavity above the piston 32 is discharged through the exhaust valve 33 at the top. When the required volume of water sample is collected, the waterproof micro motor 341 stops working through the signal control, the piston 32 stops moving, and the sampling process ends. The cable reel 4 winds up the cable, lifts the entire device out of the monitoring well, moves the device to the sample processing area, inverts it so that the counterweight head 2 is facing up and the sampling tube 3 is facing down, and screws and removes the sampling tube 3.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A portable groundwater rapid sampling and in-situ filtration device, comprising a filter cartridge (1) and a reel (4), characterized in that, The filter cylinder (1) is provided with a counterweight head (2) with a water inlet hole (211) at the lower end. The filter cylinder (1) is provided with a filter element (12) inside. The upper end of the filter cylinder (1) is detachably connected to the sampling tube (3). The sampling tube (3) is provided with a piston (32) that can slide along the tube wall and a piston rod (321) connected to the piston (32). The sampling tube (3) is provided with a drive assembly (34). The winding device (4) is connected to the piston rod (321) through a cable.

2. The portable groundwater rapid sampling and in-situ filtration device according to claim 1, characterized in that, The filter cylinder (1) has a first threaded port (11) at its lower end and a second threaded port (13) at its upper end. The counterweight head (2) is detachably connected to the lower end of the filter cylinder (1) through the first threaded port (11). The sampling tube (3) is detachably connected to the second threaded port (13) through the mounting port at its end. At least one sealing ring (14) is provided at the connection between the mounting port and the second threaded port (13).

3. The portable groundwater rapid sampling and in-situ filtration device according to claim 1, characterized in that, A primary filter screen (212) is provided at the water inlet (211).

4. The portable groundwater rapid sampling and in-situ filtration device according to claim 1, characterized in that, The sampling tube (3) has a limiting ring (31) on the inner wall of the mounting port.

5. The portable groundwater rapid sampling and in-situ filtration device according to claim 1, characterized in that, An exhaust valve (33) is provided at the top of the sampling tube (3).

6. The portable groundwater rapid sampling and in-situ filtration device according to claim 1, characterized in that, The drive assembly (34) includes a waterproof micro motor (341), a power communication module (342), a drive gear (343), and a transmission gear (344). The power communication module (342) is used to supply power to the waterproof micro motor (341) and receive control signals. The output end of the waterproof micro motor (341) is connected to the drive gear (343). The drive gear (343) meshes with the transmission gear (344), and the transmission gear (344) meshes with the piston rod (321) through a thread.

Images