A groundwater sampling device

Abstract

The present invention belongs to the technical field of groundwater sampling, and in particular to a groundwater sampling device. In view of the technical problem that, during existing manual groundwater sampling, groundwater is completely exposed to the air, and the water sample is easily polluted by the environment or wind, resulting in inaccurate water sample results, the following solution is proposed, which includes a sampling part, a sample storage part and a control part. The present invention directly samples the water sample in a tube body and directly stores the water sample to obtain a sample, which can avoid the accidental secondary contamination of the water sample during manual operation and ensure the accuracy of the sample detection parameters.

Description

Technical Field

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

[0002] Water pollution is one of the common pollutions, which concerns many aspects of environmental quality and people's livelihood. With the worsening of water pollution, groundwater pollution has also shown an increasingly serious development trend. Therefore, groundwater quality testing is particularly important. The parameters of water quality testing are important criteria for judging the quality status of groundwater, and the premise of water quality testing is groundwater sampling. In the existing technology, according to the requirements of the sampling project, it can be divided into volatile organic matter sampling and non-volatile organic matter sampling. For the sampling of volatile organic compounds, due to the volatility of VOCs, the sampling method must be non-disturbance and non-cross-interference; and for the sampling of non-volatile organic compounds, since non-volatile organic matter sampling includes stable organic matter, microorganisms, heavy metals and ordinary inorganic matter sampling, this type of sampling method has no special requirements.

[0003] In the existing technology, the sampling tools for non-volatile organic compounds include air bag pumps, water pumps and bele tubes. Among them, the most commonly used sampling method is manual sampling by sampling personnel through bele tubes. During the manual sampling process, after the sampling personnel obtain groundwater through the sampling tool, they need to manually seal it. During this process, the water sample is easily contaminated; at the same time, since the sampling work needs to be targeted at different underground environments, the existing sampling device cannot adaptively adjust the water flow for multiple sampling environments, so that the water sample is significantly disturbed, resulting in unsatisfactory sampling results. Summary of the Invention

[0004] Based on the technical problem that during the existing manual sampling of groundwater in the background technology, groundwater is completely exposed to the air, and water samples are easily polluted by the environment or wind, resulting in inaccurate water sample results, the present invention proposes a groundwater sampling device.

[0005] The present invention proposes a groundwater sampling device, which includes a sampling part, a sample storage part and a control part; the control part includes a gyroscope and a pressure sensor, which can monitor the verticality of the device and the static pressure of groundwater in real time, and automatically adjust the speed of the transmission column (adjustment range ±20%). The user can also control the device through the control part to perform sampling and sample storage, as well as subsequent machine removal and withdrawal operations after sample storage is completed; the sampling part and the sample storage part work sequentially, the sampling part is used to obtain groundwater samples, and the sample storage part is used to store the groundwater samples obtained by the machine. The stored groundwater samples can be used for subsequent water quality detection and analysis, etc.

[0006] The control part includes a shell, which is open and has a groove recessed from top to bottom on the upper surface of the shell. The groove forms a chamber in the shell. A partition is arranged in the middle of the chamber and in the transverse direction of the chamber. The partition divides the chamber into an upper chamber and a lower chamber.

[0007] A circuit integrated board is installed in the upper chamber. The circuit integrated board includes at least one PLC for controlling the device. A control switch is connected to the power port of the PLC through a power cord. Input components such as temperature sensors and water level sensors can be installed at the input end of the PLC as required; output components such as motors, water pumps, and display screens are connected one-to-one at the output end of the PLC through several drive modules.

[0008] Two handles are installed on the outer wall of the shell, and the two handles are symmetrically distributed. A slot for installing a control switch is provided on the bottom end of one of the handles. A protective cover with the same shape as the shell is screwed to the upper surface wall edge of the shell by screws. A sealing rubber pad is adhered to the surface of the protective cover that is in contact with the shell. After the shell and the protective cover are in contact, the shell and the protective cover are in a sealed connection state.

[0009] Two threaded holes are formed through the bottom surface of the shell. The two threaded holes are respectively a first connecting hole for connecting a sampling tube and a second connecting hole for connecting a sample storage tube.

[0010] A sample delivery cavity is provided in the lower chamber of the shell. The straight length of the bottom end of the sample delivery cavity is sufficient to cover the first connecting hole and the second connecting hole. The sample delivery cavity has a certain thickness. A water inlet is provided at a position corresponding to the first connecting hole on the bottom end face of the sample delivery cavity. A water outlet is provided at a position corresponding to the second connecting hole on the bottom end face of the sample delivery cavity. A micro water pump is provided at the upper end of the water outlet. The height of the water inlet of the micro water pump is not higher than half the height of the sample delivery cavity. The outer wall of the water outlet of the water pump contacts the inner wall of the water outlet hole.

[0011] A waterproof motor is arranged in the sample delivery cavity. The shaft end of the waterproof motor is connected to a transmission column. The end of the transmission column not connected to the waterproof motor shaft passes through the first connecting hole and is arranged at the lower part of the shell.

[0012] A water supply plate is arranged around the outer wall of the transmission column. The water supply plate has an arc and is high on both sides and low in the middle. The water supply plate is arranged continuously in a progressive shape. The bottom end surface of the water supply plate and the bottom end surface of the transmission column are on the same horizontal plane.

[0013] A sampling tube is arranged on the periphery of the transmission column, and an external connecting thread that engages with the first connecting hole is provided at the upper end of the sampling tube. An internal connecting thread that is the same as the first connecting hole is provided on the inner wall of the other end of the sampling tube. The sampling tube can be connected to the connecting thread at the top of the extension column through the internal connecting thread at its bottom end. A lower connecting thread is provided on the inner wall of the bottom end of the extension column, and every two extension columns can be connected end to end through threads.

[0014] A sample storage tube is set at the water outlet end, and a spring cover is installed at the upper end of the inner part of the sample storage tube. The spring cover has the structure of a sewer floor drain. When water flows in, it can move downward to open; when there is no water flow in from above, the sample storage tube is blocked under the action of the spring.

[0015] The length of the transmission column is consistent with the length of the sampling tube; the water supply plate adopts an arc-shaped spiral blade design, and the edge of the water supply plate is provided with a guide tooth with a height of 2mm-3mm.

[0016] The sampling tube includes a manually threaded extension type and an electrically retractable type. The bottom end of the sampling tube can be screwed onto the bottom tube, and a depth sensor is fixed in the groove on the outer wall of the bottom tube. The bottom end surface of the sampling tube is flush with the bottom end surface of the transmission column or is 3-5 cm lower than the bottom end surface of the transmission column.

[0017] The outer wall of the water supply plate contacts the inner wall of the sampling tube; the water supply plate is connected to the transmission column through an elastic hinge, the blade spiral angle can be adaptively adjusted within the range of 30°-60°, and guide teeth are set on the edge of the blade with a tooth height of 2-3mm.

[0018] The shell is provided with a protective cover, and after the protective cover is connected to the shell, the inside of the shell is in a sealed state.

[0019] The beneficial effects of the present invention are:

[0020] 1. By setting up a sampling tube, the sampling tube can be selected manually or automatically according to actual conditions. The inner wall of the sampling tube is hollow, and a thread for connection is provided on its upper part, and a thread for connecting an extension column is provided on its lower part. A transmission column is provided inside the sampling tube. The length of each transmission column is consistent with the length of each section of the sampling tube. When the sampling tube is extended, the transmission column can be synchronously extended by a buckle, which can improve the overall fit of the device.

[0021] 2. By setting up a water delivery plate, after the motor drives the top transmission column to rotate, the water delivery plate rotates along with the rotation of the transmission column, so that the water contacts the transmission column along with the stirring of the motor. At the same time, driven by the rotation of the transmission column, the water enters the water delivery plate and is gradually delivered to the sample delivery chamber through the rotation of the water delivery plate. The water sample can be delivered to the sample delivery chamber stably and quickly, and then transferred to the sample storage tube.

[0022] 3. When the water flows into the sample delivery chamber, the water in the sample delivery chamber will increase. The bottom end surface of the water pump opening is flat, and the water delivery plate can deliver the water in the sample delivery chamber to the sample storage tube, eliminating the disadvantage of manually pulling the sampling device for secondary operation to obtain water samples during the manual sampling process, thereby avoiding the contamination of the sample by environmental factors or wind factors during the secondary operation, and ensuring the purity of the sample.

[0023] 4. This device takes samples directly from the tube body and directly stores the water samples to obtain samples. This can avoid the accidental secondary contamination of water samples during manual operation and ensure the accuracy of sample detection parameters. The spiral water supply plate can break bubbles and guide the axial flow of water, effectively preventing air blockage and water sample disturbance. It can adapt to complex working conditions such as high sediment content and turbulent water flow, improve sampling efficiency, and reduce the erosion of the inner wall of the sampling tube by water flow, thereby extending the service life of the equipment. At the same time, this device is equipped with an independent depth detection module to achieve precise positioning, and with the spring cover, it can realize the automation of the entire "sampling-sealing" process to ensure the originality of the water sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a three-dimensional schematic diagram of the structure of a groundwater sampling device proposed by the present invention;

[0025] Figure 2 This is a schematic diagram of the connection structure between the sampling tube and the housing in a groundwater sampling device proposed by the present invention;

[0026] Figure 3 This is a schematic structural diagram of a water delivery chamber of a groundwater sampling device proposed by the present invention;

[0027] Figure 4 This is a schematic diagram of the connection between the transmission column and the water supply plate in the groundwater sampling device proposed by the present invention;

[0028] Figure 5 This is a schematic structural diagram of a sampling tube in a groundwater sampling device proposed by the present invention;

[0029] Figure 6 This is a schematic diagram of the connection structure between the sample storage tube and the conversion head in a groundwater sampling device proposed by the present invention.

[0030] In the figure: 1-protective cover; 2-display screen; 3-handle; 4-housing; 5-switch; 6-second connecting hole; 7-connector; 71-bite pattern; 72-conversion head; 8-sample storage tube; 9-first connecting hole; 10-external connecting thread; 101-lower chamber; 102-sample delivery chamber; 103-waterproof motor; 104-transmission column; 105-water delivery plate; 11-sampling tube; 12-internal connecting thread; 121-connecting thread; 122-extension column; 123-lower connecting pattern. DETAILED DESCRIPTION

[0031] The present invention will be further explained below with reference to specific embodiments.

[0032] refer to Figure 1-6 In this embodiment, a groundwater sampling device is proposed, including a sampling part, a sample storage part and a control part, wherein the control part is used to control the internal circuit structure of the device or the working state of the electronic components; specifically, the control part can integrate a gyroscope and a pressure sensor to monitor the verticality of the sampling tube 11 and the static pressure of the groundwater in real time; when the device tilts more than 5° or the static pressure is abnormal, the transmission column speed is automatically adjusted (±20%) to ensure that the depth accuracy of the sampling point is ≤±5cm; the sampling part includes a shell 4, the interior of the shell 4 has a cavity, in the cavity A sample delivery chamber 102 is installed inside, and the bottom surface of the sample delivery chamber 102 has two openings. The opening positions of the two openings correspond to the positions of the two openings located on the bottom end of the shell 4. One opening located on the shell 4 is used for water inlet, and the other opening located on the shell 4 is used for water outlet. A columnar transmission column 104 is arranged at the lower part of the shell 4 after passing through the hole for water inlet. The top of the transmission column 104 is connected to the transmission shaft of the waterproof motor 103, and the lower end surface of the transmission column 104 is concave with a thread for connecting other transmission columns 104; The outer periphery of the column 104 is surrounded by a water supply plate 105. The water supply plate 105 adopts an arc-shaped spiral blade design. The angle between the blade and the axis of the transmission column is 30°-45°, preferably 40°. The spacing between adjacent water supply plates is 5-8cm, preferably 6cm, forming a spiral ascending channel. The two sides of the water supply plate 105 are high and the middle is low. The bottom end surface of the water supply plate 105 and the bottom end surface of the transmission column 104 are located on the same horizontal plane. The outer wall of the water supply plate 105 contacts the inner wall of the sampling tube 11; the edge of the water supply plate 105 is provided with a guide tooth with a tooth height of 2-3mm for crushing The bubbles in the water flow are guided to converge toward the center of the sample delivery chamber 102; further, the water delivery plate 105 can also be connected to the transmission column 104 through an elastic hinge, the blade spiral angle can be adaptively adjusted within the range of 30°-60°, and guide teeth with a tooth height of 2-3mm are provided on the edge of the blade; when the water delivery plate 105 is connected to the transmission column 104 through an elastic hinge, if the water flow velocity exceeds the threshold, the blade automatically increases the spiral angle (up to 60°) to reduce water flow disturbance; when the flow velocity is low, the blade resets to the initial angle (30°) to ensure sampling efficiency.

[0033] A sampling tube 11 is provided on the outside of the transmission column 104, and the upper end of the sampling tube 11 is screwed onto the inner wall of the first connecting hole 9 for water inlet at the bottom end of the shell 4; a sample storage tube 8 for storing water samples is connected to the second connecting hole 6 for water outlet; the inner wall of the sample storage tube 8 is coated with polytetrafluoroethylene (PTFE) coating to reduce liquid adhesion; a water pump is also provided in the sample delivery chamber 102, and the water pump delivers the water sample temporarily stored in the sample delivery chamber 102 into the sample storage tube 8; a spring cover can also be provided at the upper end of the sample storage tube 8, so that when the water sample is injected, the cover body automatically opens; after the sampling is completed, when the water flow is not injected, the sample storage tube can be automatically sealed by the spring.

[0034] The sampling tube 11 is in the shape of a hollow tube. When in use, the sampling tube 11 can be extended as needed. The specific method is as follows: an internal connecting thread 12 is formed on the inner wall of the bottom end of the sampling tube 11, and the extension column 122 can be tightly fixed to the lower end of the sampling tube 11 through the engagement of the connecting thread 121 at its top with the internal connecting thread 12. The outer wall diameter of the extension column 122 is consistent with the outer wall diameter of the sampling tube 11, and the inner wall diameter of the extension column 122 is consistent with the inner wall diameter of the sampling tube 11. It can be understood that when the sampling tube 11 and the extension column 122 are tightly connected, the internal lumen of the sampling tube 11 and the internal lumen of the extension column 122 are in a connected state. A lower connecting thread 123 is provided at the lower end of the extension column 122. By connecting the lower connecting threads 123 and the connecting threads 121 on different extension columns 122, the end-to-end connection between multiple extension columns 122 can be achieved, thereby achieving the effect of extending the total length of the extension column 122.

[0035] A protective cover 1 is provided on the outer shell 4. After the protective cover 1 and the outer shell 4 are connected, the inner shell 4 is in a sealed state; the length of the transmission column 104 is consistent with the length of the sampling tube 11 or the length of the transmission column 104 is 3-5 cm shorter than the length of the sampling tube 11. The bottom end of the sample storage tube 8 is open, and a sealing cover is connected to the bottom end of the sample storage tube 8 through a threaded connection.

[0036] In the existing structure, the water quality detection of shallow groundwater usually requires the operator to tie a connecting rope or a soft ruler on the bele tube for sampling; this sampling method requires manual pouring out of the water sample taken from the bele tube for storage or sealing. In the process of manually pouring out the water sample, the water sample is easily polluted by the environment or wind, resulting in inaccurate water sample detection results. The present device is also used to obtain shallow groundwater samples for water quality detection. Its intelligent structural connection is functionally connected by technicians in the technical field according to known attempts. There is no restriction on the power structure model, and it is only necessary to achieve the power structure workmanship effect predetermined by the device.

[0037] The user connects the device to an external control power supply. Since the working environment of water sample collectors is mostly outdoors, their power supply is not sufficient. The power supply structure is set as a car connector, which can be connected to the vehicle driven by the staff. After the device is powered on, the power status of the device can be controlled by the switch.

[0038] At the same time, the length of the sample storage tube 8 can be replaced according to the amount of water sample that the user wants to obtain. When the diameter of the upper end connector 7 of the sample storage tube 8 to be replaced is equal to the diameter of the second connecting hole 6, it can be directly replaced; when the diameter of the upper end connector 7 of the sample storage tube 8 to be replaced is smaller than or larger than the diameter of the second connecting hole 6, a conversion head 72 is required; one end of the conversion head 72 is equal to the diameter of the second connecting hole 6; the other end is provided with an outer wall diameter equal to the outer wall diameter of the upper end connector 7 of the sample storage tube 8 to be replaced, and the end is provided with a bite pattern 71 connected to the connector 7. The conversion head 72 has a variety of specifications to meet the use requirements of sample tubes 8 of various diameters.

[0039] At the same time, the sampling tube 11 has two types: electric and manual. The electric sampling tube is realized by an electric telescopic rod with a waterproof effect, and the manual sampling tube 11 is extended by a threaded end connection; the specifications of the sampling tube are not unique, that is, the sampling tube can have multiple lengths such as 10m, 8m and 5m to meet the user's needs when sampling at a different depth.

[0040] In order to accurately determine the descent depth of the device, a wireless depth detector needs to be installed. In order to ensure the installation stability of the depth detector, a groove for placing the depth detector is opened on the outer wall of the tube body at the bottom end. A card slot is provided in the groove, and the depth sensor is fixed in the card slot. The tube body with the slot is the bottom end tube, and the length of the bottom end tube is 30 cm. The bottom end tube is screwed to the bottom end of the bottommost sampling tube 11.

[0041] First embodiment

[0042] The user determines the length of the sampling tube 11 according to the specific groundwater depth. After the length of the sampling tube 11 is determined, the transmission column 104 is first connected at both ends, and then the sampling tube 11 is connected according to the length of the transmission column 104. After the sampling tube 11 is connected, the bottom tube is connected; then the sample storage tube 8 is connected to the shell 4 and the sample delivery chamber 102, and the device is then connected to the car power supply. After the connection is completed, the device is powered on by controlling the switch 5. The user sends the sampling tube 11 into the groundwater sampling well. The depth sensor detects and feeds back the depth of the device in real time and displays it on the display. After reaching the sampling depth, the user turns on the device by the switch, and the waterproof motor 103 drives the transmission column 104 to rotate. The water flow contacts the transmission along with the rotation of the sampling tube 11 Column 104, when the transmission column 104 rotates, the spiral blades of the water delivery plate 105 push the water flow to spiral up along the inner wall of the sampling tube 11, and at the same time the guide teeth destroy the water vortex to form a stable axial flow; at the same time, the water inlet of the water pump generates suction, so that there is a negative pressure in the sampling tube 11, and the water flow will go up along with the rotation of the water delivery plate 105, and finally reach the sample delivery cavity 102, enter the water pump, and the water pump delivers the water sample in the sample delivery cavity 102 into the sample storage tube 8; the spring gravity cover on the surface of the sample storage tube 8 is opened by the impact of the water flow, and the water sample enters the sample storage tube 8. After the sampling is completed, the water pump stops working, the motor stops rotating, and the water sample no longer enters the sampling tube 11. The user lifts the device, and the spring gravity cover automatically blocks the sampling tube 11.

[0043] Second embodiment

[0044] When the user's sampling depth is between 20-25m, an electrically retractable sampling tube can be used. When the electrically retractable rod is fully retracted, the user connects the transmission column 104 end to end and connects the bottom tube to the bottom end of the sampling tube 11; then connects the sample storage tube 8 to the housing 4 and the sample delivery chamber 102, and then connects the device to the car power supply. After the connection is completed, the device is powered on by controlling the switch 5. The user sends the sampling tube 11 into the groundwater sampling well. The depth sensor detects and feeds back the depth of the device in real time and displays it on the display. After reaching the sampling depth, the user turns on the device through the switch, and the waterproof motor 103 drives the transmission column 104 to rotate. The water flow contacts the transmission column 104 as the sampling tube 11 rotates, and the transmission column 10 After the outer water supply plate 105 contacts the water flow, the water flow rotates along with the rotation of the water supply plate 105. At the same time, the water inlet of the water pump generates suction, which creates a negative pressure in the sampling tube 11. The water flow then rises along with the rotation of the water supply plate 105, eventually reaching the sample delivery chamber 102 and entering the water pump. The water pump then delivers the water sample in the sample delivery chamber 102 into the sample storage tube 8. The spring gravity cover on the surface of the sample storage tube 8 opens under the impact of the water flow, and the water sample enters the sample storage tube 8. After sampling is completed, the water pump stops working, the motor stops rotating, and the water sample no longer enters the sampling tube 11. The spring gravity cover automatically blocks the sampling tube 11. The user then lifts the device, removes the sample storage tube 8, retracts the electric telescopic rod, and removes the transmission column 104.

[0045] Third embodiment

[0046] There is no display screen on the housing 4, but a handle is provided on the protective cover 1, and a tape measure is tied to the handle. The user can judge the depth of the device according to the lowering length of the tape measure. Therefore, when in use, since a wireless depth detector is no longer needed for depth detection, there is no need to connect a bottom tube to the bottom end of the sampling tube 11. The user lowers the device with a tape measure. After placing it at a suitable height, the user connects the device to the car power supply, that is, turns on the power. After the power is turned on, the waterproof motor 103 starts working and the water pump starts working. The sampling process is as above.

[0047] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A groundwater sampling device, comprising a sampling part, a sample storage part and a control part, wherein: The control part is used to control the working state of the circuit structure or electronic components inside the device, and is characterized in that the sampling part includes a shell (4), the interior of the shell (4) has a cavity, and a sample delivery cavity (102) is installed in the cavity. The bottom end surface of the sample delivery cavity (102) has two openings, and the opening positions of the above-mentioned two openings correspond to the positions of the two openings located on the bottom end of the shell (4). One opening located on the shell (4) is used for water inlet, and the other opening located on the shell (4) is used for water outlet. A columnar transmission column (104) passes through the hole for water inlet and is arranged at the lower part of the shell (4). The top end of the transmission column (104) is connected to the transmission shaft of the waterproof motor (103), and the lower end surface of the transmission column (104) is concavely provided with a thread for connecting to other transmission columns (104); A water supply plate (105) is arranged around the periphery of the transmission column (104). The water supply plate (105) is arc-shaped and has high sides and a low middle. The bottom end surface of the water supply plate (105) and the bottom end surface of the transmission column (104) are located on the same horizontal plane. A sampling tube (11) is arranged outside the transmission column (104). The upper end of the sampling tube (11) is screwed to the inner wall of the first connecting hole (9) for water inlet at the bottom end of the housing (4) through an external connecting thread (10); a sample storage tube (8) for storing water samples is connected to the second connecting hole (6) for water outlet; a water pump is also arranged in the sample delivery chamber (102), and the water pump delivers the water sample temporarily stored in the sample delivery chamber (102) into the sample storage tube (8); a spring cover is provided at the upper end of the sample storage tube (8).

2. The groundwater sampling device according to claim 1, characterized in that The length of the transmission column (104) is consistent with the length of the sampling tube (11); the water supply plate (105) adopts an arc-shaped spiral blade design, and the edge of the water supply plate (105) is provided with a guide tooth with a height of 2-3 mm.

3. The groundwater sampling device according to claim 2, characterized in that: The sampling tube (11) includes a manually threaded extension type and an electrically retractable type, the bottom end of which can be screwed to a bottom end tube, and a depth sensor is fixed in a groove on the outer wall of the bottom end tube; the bottom end surface of the sampling tube (11) is flush with the bottom cross-section of the transmission column (104) or the bottom end surface of the sampling tube (11) is 3-5 cm lower than the bottom end surface of the transmission column (104).

4. The groundwater sampling device according to claim 1, characterized in that The outer wall of the water supply plate (105) contacts the inner wall of the sampling tube (11); the water supply plate (105) is connected to the transmission column (104) via an elastic hinge, the blade helix angle can be adaptively adjusted within the range of 30°-60°, and guide teeth are provided on the blade edge with a tooth height of 2-3 mm.

5. The groundwater sampling device according to claim 1, characterized in that: The housing (4) is provided with a protective cover (1), and after the protective cover (1) is connected to the housing (4), the interior of the housing (4) is in a sealed state.

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