Underground water sampling device

Abstract

The invention belongs to the technical field of sampling equipment, and particularly discloses an underground water sampling device which comprises a sampling pipe body, a water inlet assembly and a water drainage assembly, and the sampling pipe body is provided with a first end and a second end in the axial direction of the sampling pipe body; the water inlet assembly is arranged at the first end, and the water inlet assembly is provided with a one-way water inlet; the drainage assembly is arranged at the second end and provided with a one-way drainage opening. The underground water sampling device disclosed by the invention is beneficial to eliminating the interference of dirt in a drill hole, ensures the sampling quality, does not need to be driven by external force for sampling, and can be convenient for field drilling and sampling.

Description

Technical Field

[0001] The invention belongs to the technical field of sampling equipment, and in particular relates to a groundwater sampling device. Background Art

[0002] Water chemical analysis is an important means of hydrogeological survey. The quality of the water chemical samples obtained is an important basis for ensuring the test results. The groundwater sampling points are mainly wells, springs and boreholes. It is difficult to obtain groundwater in boreholes, especially old boreholes. The conditions in the boreholes are poor, the sampling process is difficult and the sample quality cannot be guaranteed.

[0003] The sampling device in the related technology achieves accurate fixed-depth sampling and reduces errors caused by human operation through the combination of mechanical and electronic control. However, in the field environment, the maintenance cost of the equipment is high and it is even affected by environmental factors, which can easily cause contamination to groundwater samples. In addition, some sampling devices require external power and cannot be used in the field environment. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the present invention provides a groundwater sampling device that can achieve sampling without external power driving conditions and is conducive to ensuring the sampling quality.

[0005] The groundwater sampling device of an embodiment of the present invention includes a sampling tube body, a water inlet assembly and a drainage assembly, wherein the sampling tube body has a first end and a second end along its axial direction; the water inlet assembly is arranged at the first end, and the water inlet assembly has a one-way water inlet; the drainage assembly is arranged at the second end, and the drainage assembly has a one-way discharge outlet.

[0006] When sampling is needed, the water inlet component of the groundwater sampling device is placed downward into the sampling hole. The water in the borehole first enters the sampling tube body through the water inlet component, and the water in the borehole can only enter the sampling tube body from the one-way water inlet and cannot be discharged through the water inlet component. After the sampling tube body is filled with water, the water located at the second end can be discharged from the one-way discharge port of the drainage component, so that the floating objects that first enter the sampling tube body and float on the surface of the sampling hole can be discharged, so that the sampling tube body is filled with groundwater in the target layer, which is beneficial to ensure the sampling quality. The groundwater sampling device can sink into the water in the sampling hole by its own gravity, and sampling can be carried out without external force, which is convenient for field sampling.

[0007] In this embodiment, the water inlet assembly includes: a water inlet pipe body, which is connected to the first end; a first one-way valve component, which is arranged in the water inlet pipe body, and the first one-way valve component connects the water inlet pipe body and the sampling tube body when water is entering; and a filter component, which is arranged in the water inlet pipe body and is located on the water inlet side of the one-way valve component.

[0008] In this embodiment, the first one-way valve component includes: a first baffle, which is arranged in the water inlet pipe body, and the one-way water inlet is arranged on the first baffle to connect the water inlet pipe body and the sampling tube body; a first valve seat, which is arranged on the side of the first baffle facing the sampling tube body; a first elastic member, one end of the first elastic member is connected to the first valve seat; and a first valve plate, which is connected to the other end of the first elastic member and can block the one-way water inlet under the drive of the first elastic member.

[0009] In this embodiment, the first valve seat includes a first side plate and a first cover plate, the first side plate is arranged around the first cover plate, and one end of the first side plate away from the first cover plate is connected to the first baffle plate, and the first side plate is provided with a first drain port.

[0010] In this embodiment, the filter component includes a second baffle, which is arranged in the water inlet pipe body. The tube wall of the water inlet pipe body is provided with a side water inlet and a second drain port which are relatively arranged, and the side water inlet is located on the side of the second baffle facing the drain component, and the second drain port is located on the side of the second baffle facing away from the drain component.

[0011] In this embodiment, the second baffle is arranged to be inclined relative to the radial direction of the water inlet pipe body, and in the axial direction of the water inlet pipe body, the side water inlet is located on the side of the second drain port away from the first baffle.

[0012] In this embodiment, the filter component further includes a filter screen, and the filter screen is arranged at the side water inlet.

[0013] In this embodiment, the water inlet pipe body is threadedly connected to the sampling tube body.

[0014] In this embodiment, the drainage component includes: a drainage pipe body, which is connected to the second end; a second one-way valve component, which is arranged in the drainage pipe body, and the second one-way valve component connects the drainage pipe body and the sampling tube body during drainage.

[0015] In this embodiment, the groundwater sampling device further includes a lifting member, and the lifting member is disposed on the drainage component. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic cross-sectional structure diagram of a groundwater sampling device according to an embodiment of the present invention.

[0017] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0018] Figure 3 yes Figure 1 Enlarged view of point B in the middle.

[0019] Reference numerals:

[0020] 1. Sampling tube body;

[0021] 2. Water inlet assembly; 21. One-way water inlet; 22. Water inlet pipe body; 221. Side water inlet; 222. Second drain outlet; 23. First one-way valve component; 231. First baffle; 232. First valve seat; 2321. First drain outlet; 233. First elastic member; 234. First valve plate; 24. Filter component; 241. Second baffle; 242. Filter screen;

[0022] 3. Drain assembly; 31. One-way discharge port; 32. Drain pipe body; 33. Second one-way valve component; 331. Third baffle; 332. Second valve seat; 3321. Overflow port; 333. Second elastic member; 334. Second valve plate;

[0023] 4. Lifting pieces. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0025] In this embodiment, if Figure 1 As shown, the groundwater sampling device includes a sampling tube body 1, a water inlet assembly 2, and a drainage assembly 3. The sampling tube body 1 has a first end and a second end along its axial direction; the water inlet assembly 2 is arranged at the first end, and the water inlet assembly 2 has a one-way water inlet 21; the drainage assembly 3 is arranged at the second end, and the drainage assembly 3 has a one-way discharge port 31.

[0026] Specifically, the sampling tube body 1 can be a stainless steel sampling tube body 1. The stainless steel sampling tube body 1 is corrosion-resistant and not easy to rust, which can prevent the sampling tube body 1 from polluting the water sample itself, and make the sampling tube body 1 heavier, so that it is easy to sink into the liquid to be sampled, which is convenient for sampling. Similarly, the water inlet component 2 and the drainage component 3 can both be made of stainless steel. Of course, those skilled in the art can also set the sampling tube body 1, the water inlet component 2, and the drainage component 3 to other materials that meet the needs, which is not limited here.

[0027] When sampling is required, the water inlet component 2 of the groundwater sampling device is placed downward into the sampling hole, and the water in the borehole enters the sampling tube body 1 through the water inlet component 2, and the water in the borehole can only enter the sampling tube body 1 from the one-way water inlet 21, and cannot be discharged through the water inlet component 2. After the sampling tube body 1 is filled with water, the water located at the second end can be discharged from the one-way discharge port 31 of the drainage component 3, so that the floating objects that first enter the sampling tube body 1 and float on the surface of the sampling hole can be discharged, and the sampling tube body 1 is filled with groundwater in the target layer, which is beneficial to ensure the sampling quality, and the groundwater sampling device can sink into the water in the sampling hole by its own gravity, and sampling can be carried out without external force, which is convenient for field sampling.

[0028] In this embodiment, if Figure 1 As shown, the water inlet assembly 2 includes a water inlet pipe body 22, a first one-way valve component 23 and a filter component 24, the water inlet pipe body 22 is connected to the first end; the first one-way valve component 23 is arranged in the water inlet pipe body 22, and the first one-way valve component 23 connects the water inlet pipe body 22 and the sampling tube body 1 when water is entering; the filter component 24 is arranged in the water inlet pipe body 22 and is located on the water inlet side of the first one-way valve component 23.

[0029] It can be understood that when sampling is performed, the water in the sampling hole can enter the interior of the sampling tube body 1 through the filter component 24 and the first one-way valve component 23 in sequence. The filter component 24 can filter the water sample to improve the sampling quality. The first one-way valve component 23 can allow the water in the sampling hole to enter the sampling tube body 1 and can prevent the water in the sampling tube body 1 from being discharged through the water inlet component 2 to achieve sampling.

[0030] In this embodiment, if Figure 1 and Figure 2As shown, the first one-way valve component 23 includes a first baffle 231, a first valve seat 232, a first elastic member 233 and a first valve disc 234. The first baffle 231 is arranged in the water inlet pipe body 22, and the one-way water inlet 21 is arranged on the first baffle 231 to connect the water inlet pipe body 22 and the sampling tube body 1; the first valve seat 232 is arranged on the side of the first baffle 231 facing the sampling tube body 1; one end of the first elastic member 233 is connected to the first valve seat 232; the first valve disc 234 is connected to the other end of the first elastic member 233, and can block the one-way water inlet 21 under the drive of the first elastic member 233.

[0031] For example, the first elastic member 233 is a spring, and the axial direction of the first elastic member 233 is parallel to the axial direction of the sampling tube body 1. Of course, the first elastic member 233 can also be set in other forms, which is not limited here.

[0032] It should be noted that when the water inlet assembly 2 is not put into water, under the elastic force of the first elastic member 233, the first valve plate 234 abuts against the first baffle 231 to block the one-way water inlet 21 through the first valve plate 234; when the water inlet assembly 2 is put into water, under the pressure of water, the first valve plate 234 moves toward the direction of the drainage assembly 3, the first elastic member 233 contracts, the one-way water inlet 21 connects the water inlet pipe body 22 and the sampling pipe body 1, and the water in the water inlet pipe body 22 can enter the sampling pipe body 1 through the one-way water inlet 21 for sampling. The first valve seat 232 can be provided to facilitate the installation of the first elastic member 233.

[0033] In this embodiment, if Figure 2 As shown, the first valve seat 232 includes a first side plate and a first cover plate. The first side plate is arranged around the first cover plate, and one end of the first side plate away from the first cover plate is connected to the first baffle plate 231. The first side plate is provided with a first drain port 2321.

[0034] For example, if the first cover plate is circular and the first side plate is a cylindrical structure, the first valve seat 232 and the first baffle plate 231 enclose a second installation cavity, and the one-way water inlet 21 is connected to the second installation cavity. The first side plate and the first cover plate can be welded or integrally formed, which is not limited here. One or more first drain ports 2321 can be set on the first side plate. When multiple first drain ports 2321 are set, the efficiency of sampling can be improved. The number of first drain ports 2321 can be set as needed, which is not limited here.

[0035] It should be noted that water enters the first installation cavity surrounded by the first valve seat 232 and the first baffle plate 231 through the one-way water inlet 21, and then enters the sampling tube body 1 through the first drain port 2321 on the first side plate. The first valve seat 232 can further block some impurities, thereby improving the quality of the water sample entering the sampling tube body 1.

[0036] In this embodiment, if Figure 1 and Figure 2 As shown, the filter component 24 includes a second baffle 241, and the second baffle 241 is arranged in the water inlet pipe body 22. The tube wall of the water inlet pipe body 22 is provided with a side water inlet 221 and a second drain port 222 which are relatively arranged. The side water inlet 221 is located on the side of the second baffle 241 facing the drain component 3, and the second drain port 222 is located on the side of the second baffle 241 away from the drain component 3.

[0037] Specifically, the second baffle 241 is located on the side of the first baffle 231 away from the sampling tube body 1, and is spaced apart from the first baffle 231, so as to form a water inlet cavity between the first baffle 231 and the second baffle 241 in the water inlet tube body 22, so that the water sample enters the water inlet cavity through the side water inlet 221, and the water in the water inlet cavity applies pressure to the first valve plate 234 to open the one-way water inlet 21. In addition, the end of the water inlet tube body 22 away from the sampling tube body 1 is annular, and the resistance of the water inlet tube body 22 entering the water body is small, and the silt in the sampling hole can be dredged in combination with the overall gravity, so that it can be used for sampling in sampling holes under different working conditions, thereby improving the scope of application.

[0038] When sampling, the bottom of the water inlet pipe body 22 first contacts the water surface in the sampling hole. As the water inlet pipe body 22 penetrates into the water body, impurities floating in the water body enter the interior of the water inlet pipe body 22 through the end of the water inlet pipe body 22 and are discharged from the second drain port 222 on the water inlet pipe body 22. At the same time, water can enter the water inlet pipe body 22 above the second baffle 241 through the side water inlet 221, and the one-way water inlet 21 is opened under pressure for sampling. The side water inlet 221 and the second drain port 222 are arranged relative to each other, which can effectively reduce the floating impurities entering the water inlet pipe body 22 from the side water inlet 221, which is beneficial to improving the sampling quality.

[0039] In this embodiment, if Figure 1 and Figure 2 As shown, the second baffle 241 is arranged to be inclined relative to the radial direction of the water inlet pipe body 22 , and in the axial direction of the water inlet pipe body 22 , the side water inlet 221 is located on the side of the second drain port 222 away from the first baffle 231 .

[0040] It can be understood that the side water inlet 221 is located on the side of the second drain outlet 222 away from the first baffle 231, that is, when sampling is performed, the side water inlet 221 is located below the second drain outlet 222, and impurities on the surface of the sampling hole enter the water inlet pipe body 22 through the port below the water inlet pipe body 22. As the water inlet pipe body 22 goes deeper, the water in the sampling hole enters the water inlet pipe body 22 above the second baffle 241 through the side water inlet 221, and the water with floating impurities is discharged through the second drain outlet 222. The side water inlet 221 is at the bottom and the second drain outlet 222 is at the top, which can prevent the liquid with floating objects discharged from the second drain outlet 222 from entering the water inlet pipe body 22 above the second baffle 241 after being discharged from the second drain outlet 222, which is beneficial to further improve the sampling quality.

[0041] In this embodiment, if Figure 1 and Figure 2 As shown, the filter component 24 further includes a filter screen 242 , and the filter screen 242 is disposed at the side water inlet 221 .

[0042] Specifically, the filter screen 242 is fixed to the water inlet pipe body 22 . The fixing method of the filter screen 242 is conventional in the prior art and will not be described in detail herein.

[0043] It is understandable that a filter screen 242 is provided at the side water inlet 221. By providing the filter screen 242, water entering the water inlet pipe body 22 from the side water inlet 221 can be filtered, thereby improving the quality of sampling.

[0044] In this embodiment, if Figure 1 and Figure 2 As shown, the water inlet pipe body 22 is threadedly connected to the sampling pipe body 1.

[0045] For example, an end of the water inlet pipe body 22 adjacent to the sampling pipe body 1 is provided with an external thread, and the sampling pipe body 1 is provided with an internal thread corresponding to the water inlet pipe body 22, so that the water inlet pipe body 22 and the sampling pipe body 1 are threadedly connected through the cooperation of the internal thread and the external thread. Of course, the water inlet pipe body 22 can also be provided with an internal thread, and the sampling pipe body 1 can be provided with an external thread, which is not limited here.

[0046] It can be understood that the water inlet pipe body 22 and the sampling tube body 1 are threadedly connected, which can make the connection between the water inlet pipe body 22 and the sampling tube body 1 more convenient.

[0047] In this embodiment, if Figure 1 and Figure 3 As shown, the drainage assembly 3 includes a drainage pipe body 32 and a second one-way valve component 33, and the drainage pipe body 32 is connected to the second end; the second one-way valve component 33 is arranged in the drainage pipe body 32, and the second one-way valve component 33 connects the drainage pipe body 32 and the sampling tube body 1 when draining water.

[0048] Specifically, the drain pipe body 32 and the sampling pipe body 1 can be connected by threads. For example, an end of the drain pipe body 32 adjacent to the sampling pipe body 1 is provided with an external thread, and the sampling pipe body 1 is provided with an internal thread corresponding to the drain pipe body 32, so that the drain pipe body 32 and the sampling pipe body 1 are threadedly connected by the cooperation of the internal thread and the external thread. Of course, the drain pipe body 32 can also be provided with an internal thread, and the sampling pipe body 1 can be provided with an external thread, which is not limited here.

[0049] In this embodiment, if Figure 1 and Figure 3 As shown, the second one-way valve component 33 includes a third baffle plate 331, a second valve seat 332, a second elastic member 333 and a second valve plate 334. The third baffle plate 331 is arranged in the drainage pipe body 32, the second valve seat 332 is arranged on the side of the third baffle plate 331 facing the sampling tube body 1, and a second installation cavity is formed between the second valve seat 332 and the third baffle plate 331. The side of the second valve seat 332 facing the sampling tube body 1 is provided with an overflow port 3321 to connect the second installation cavity with the sampling tube body 1.

[0050] The third baffle plate 331 is provided with a one-way discharge port 31 to connect the side of the third baffle plate 331 away from the sampling tube body 1 with the second installation cavity; the second elastic member 333 is located in the second installation cavity, and one end of the second elastic member 333 is connected to the third baffle plate 331; the second valve plate 334 is connected to the other end of the second elastic member 333, so that the second valve plate 334 blocks the overflow port 3321 under the drive of the second elastic member 333.

[0051] Specifically, the one-way outlet 31 may include a plurality of one-way through holes spaced apart on the third baffle 331 , and the one-way outlet 31 is divided into a plurality of one-way through holes to discharge water or gas in the upper part of the sampling tube body 1 through the one-way through holes.

[0052] For example, the second elastic member 333 is a spring, and the axial direction of the second elastic member 333 is parallel to the axial direction of the sampling tube body 1. Of course, the second elastic member 333 can also be set in other forms, which is not limited here.

[0053] It should be noted that, when no water enters the sampling tube body 1, under the elastic force of the second elastic member 333, the second valve plate 334 abuts against the second valve seat 332 and blocks the overflow port 3321; when water enters the sampling tube body 1, the second valve plate 334 is pressurized, so that the second valve plate 334 pushes the second elastic member 333 to contract, and the overflow port 3321 connects the second installation cavity and the sampling tube body 1. When the sampling tube body 1 is filled with water, the water in the upper part can enter the second installation cavity through the overflow port 3321, and the water in the second installation cavity can be discharged through the one-way discharge port 31 on the third baffle 331.

[0054] In this embodiment, if Figure 1 and Figure 3 As shown, the second valve seat 332 includes a second side plate and a second cover plate, the second side plate is arranged around the circumference of the second cover plate, and the end of the second side plate away from the second cover plate is connected to the third baffle plate 331, and the overflow port 3321 is arranged on the second cover plate. The second side plate and the second cover plate can be welded or integrally formed, which is not limited here.

[0055] In this embodiment, if Figure 1 and Figure 3 As shown, the groundwater sampling device also includes a lifting member 4, which is arranged on the drainage component 3.

[0056] For example, the lifting member 4 is a rod, and when sampling, a rope can be tied to the lifting member 4, so that the groundwater sampling device can be pulled by the rope. Of course, the lifting member 4 can also be set in other forms that are convenient for pulling, which is not limited here.

[0057] It can be understood that by providing the lifting member 4 on the drainage component 3, it is convenient to tie the rope through the lifting member 4 and lift the groundwater sampling device, making it easier to operate during sampling.

[0058] When sampling is required, first check the connection status of each component. Under the condition that the connection is intact, put the water inlet component 2 of the groundwater sampling device downward into the sampling hole. The groundwater in the hole first enters the water inlet component 2 through the bottom water inlet, and is then blocked by the second baffle 241 and discharged from the second drain port 222. This process is intended to remove floating objects and oil stains in the sampling hole. During the continuous descent of the groundwater sampling device, under the influence of gravity and hydrostatic pressure, the first valve plate 234 in the water inlet component 2 opens, and groundwater enters the sampling tube body 1 through the one-way water inlet 21, compressing the gas in the sampling tube body 1, so that the second valve plate 334 of the drain component 3 opens the overflow port 3321 to complete the exhaust; the groundwater sampling device continues to descend, causing the sampling tube body 1 to be filled with groundwater, and completes the replacement of shallow groundwater by deep groundwater in the sampling tube body 1, so that the sampling tube body 1 is filled with groundwater in the target layer. During the process of lifting the groundwater sampling device upward, the one-way water inlet 21 of the water inlet component 2 and the overflow port 3321 of the drainage component 3 are both kept closed, ensuring that the groundwater sample in the sampling tube body 1 is not contaminated, which is beneficial to ensuring the sampling quality. The groundwater sampling device can sink into the water in the sampling hole by its own gravity, and sampling can be carried out without external force, which is convenient for field sampling.

[0059] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0060] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0063] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. 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 described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0064] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A groundwater sampling device, characterized in that: It includes a sampling tube body, a water inlet assembly and a drainage assembly. The sampling tube body has a first end and a second end along its axial direction; the water inlet assembly is arranged at the first end, and the water inlet assembly has a one-way water inlet; the drainage assembly is arranged at the second end, and the drainage assembly has a one-way discharge outlet.

2. The groundwater sampling device according to claim 1, characterized in that: The water inlet assembly comprises: a water inlet pipe body connected to the first end; a first one-way valve component, the first one-way valve component is arranged in the water inlet pipe body, and the first one-way valve component connects the water inlet pipe body and the sampling pipe body when water is flowing in; A filter component is arranged on the water inlet pipe body and is located at the water inlet side of the one-way valve component.

3. The groundwater sampling device according to claim 2, characterized in that: The first one-way valve component comprises: A first baffle, wherein the first baffle is disposed in the water inlet pipe body, and the one-way water inlet is disposed on the first baffle to enable the water inlet pipe body to communicate with the sampling pipe body; a first valve seat, the first valve seat being arranged on a side of the first baffle plate facing the sampling tube body; a first elastic member, one end of which is connected to the first valve seat; A first valve plate is connected to the other end of the first elastic member and can block the one-way water inlet under the drive of the first elastic member.

4. The groundwater sampling device according to claim 3, characterized in that: The first valve seat includes a first side plate and a first cover plate. The first side plate is arranged around the first cover plate. One end of the first side plate away from the first cover plate is connected to the first baffle plate. The first side plate is provided with a first drain port.

5. The groundwater sampling device according to claim 3, characterized in that: The filter component includes a second baffle, which is arranged in the water inlet pipe body. The water inlet pipe body is provided with a side water inlet and a second drain port arranged oppositely on the tube wall, and the side water inlet is located on the side of the second baffle facing the drain component, and the second drain port is located on the side of the second baffle facing away from the drain component.

6. The groundwater sampling device according to claim 5, characterized in that: The second baffle is arranged to be inclined relative to the radial direction of the water inlet pipe body, and in the axial direction of the water inlet pipe body, the side water inlet is located on the side of the second drain port away from the first baffle.

7. The groundwater sampling device according to claim 5, characterized in that: The filter component further comprises a filter screen, and the filter screen is arranged at the side water inlet.

8. The groundwater sampling device according to claim 2, characterized in that: The water inlet pipe body is threadedly connected to the sampling pipe body.

9. The groundwater sampling device according to claim 1, characterized in that: The drainage assembly comprises: a drainage pipe body connected to the second end; A second one-way valve component is disposed in the drainage pipe body, and the second one-way valve component connects the drainage pipe body and the sampling pipe body during drainage.

10. The groundwater sampling device according to any one of claims 1 to 9, characterized in that: It also includes a lifting member, which is arranged on the drainage component.

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