Underground water sampling device

Abstract

The invention belongs to the technical field of underground water sampling, particularly relates to an underground water sampling device, and provides the following scheme aiming at the technical problems that underground water is completely exposed in air and a water sample is easily polluted by environment or wind during manual sampling of the underground water in the prior art, so that the result of the water sample is inaccurate. The device comprises a sampling part, a sample storage part and a control part, according to the invention, direct sampling is carried out in the tube body, and the obtained water sample is directly stored in the tube so as to obtain the sample, so that the accident that the water sample is subjected to secondary pollution in the manual operation process can be avoided, and the accuracy degree of sample detection parameters is ensured.

Description

Technical Field

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

[0002] Water pollution is one of the common pollutions, which is related to the environmental quality and many aspects of people's livelihood. With the aggravation of water pollution, groundwater pollution also shows an increasingly serious development trend. Therefore, groundwater quality detection is particularly important. The parameters of water quality detection are important criteria for judging the groundwater quality state, and the premise of water quality detection is groundwater sampling. In the prior art, according to the sampling project requirements, it can be divided into volatile organic matter sampling and non-volatile organic matter sampling. For the sampling of volatile organic matter, due to the easy volatility of VOCs, the sampling method must be non-disturbing and free of cross-interference. For the sampling of non-volatile organic matter, since the sampling of non-volatile organic matter includes the sampling of stable organic matter, microorganisms, heavy metals and ordinary inorganic substances, there are no special requirements for this kind of sampling method.

[0003] In the prior art, the sampling tools for non-volatile organic matter include airbag pumps, water pumps and bailer tubes, etc. Among them, the most commonly used sampling method is that the sampling personnel realize manual sampling through the bailer tube. During the manual sampling process, after the sampling personnel obtain the groundwater through the sampling tool, they need to perform sealing manually. During this process, the water sample is easily contaminated. At the same time, since the sampling work needs to be carried out for different underground environments, the existing sampling devices cannot adaptively adjust the water flow for a variety of sampling environments, so the water sample is significantly disturbed, resulting in the problem that the sampling effect is not ideal from time to time. Summary of the Invention

[0004] Based on the technical problem that when sampling groundwater manually in the prior art, the groundwater is completely exposed to the air, and the water sample is easily contaminated by environmental pollution or wind pollution, resulting in inaccurate water sample results, the present invention proposes a groundwater sampling device.

[0005] A groundwater sampling device proposed by the present invention 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 device verticality and groundwater static pressure in real time, and automatically adjust the rotation speed of the transmission column (adjustment range ±20%). The user can also control the device to sample and store samples through the control part, as well as the operations of getting off the machine and withdrawing the machine after the subsequent 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 housing which is open at the top. A groove is recessed in the housing from top to bottom on the upper surface of the housing, and the groove forms a chamber inside the housing. A partition is arranged in the middle of the chamber and in the transverse direction of the chamber, and the partition divides the chamber into an upper chamber and a lower chamber.

[0007] In the upper chamber, a circuit integration board is installed. The circuit integration board at least includes a PLC for controlling the device. A control switch is connected to the power supply port of the PLC through a power line. Input components such as a temperature sensor and a water level sensor can be arranged at the input end of the PLC as required; at the output end of the PLC, output components such as a motor, a water pump, and a display screen are connected one-to-one through a number of drive modules.

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

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

[0010] In the lower chamber of the housing, a sample delivery chamber is arranged. The bottom end straight length of the sample delivery chamber is long enough to cover the first connection hole and the second connection hole. The sample delivery chamber has a certain thickness. A water inlet hole is arranged at the position corresponding to the first connection hole on the bottom end surface of the sample delivery chamber, and a water outlet hole is arranged at the position corresponding to the second connection hole on the bottom end surface of the sample delivery chamber. A micro water pump is arranged at the upper end position of the water outlet hole. The height of the water inlet of the micro water pump is not higher than half of the height of the sample delivery chamber, and 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 chamber. The rotating shaft end of the waterproof motor is connected to a transmission column, and the end of the transmission column that is not connected to the rotating shaft of the waterproof motor passes through the first connection hole and is arranged at the lower part of the housing.

[0012] A water delivery plate is arranged around the outer wall of the transmission column. The water delivery plate has a radian and the two sides of the water delivery plate are high and the middle is low. The water delivery plates are arranged continuously in a progressive manner, and the bottom end surface of the water delivery plate and the bottom end surface of the transmission column are on the same horizontal plane.

[0013] A sampling tube is arranged around the transmission column. An external connection thread that engages with the first connection hole is provided at the upper end of the sampling tube. An internal connection thread identical to the first connection hole is provided on the inner wall at the other end of the sampling tube. The sampling tube can be connected to the connection thread at the top of the extension column through the internal connection thread at its bottom end. A lower connection thread is provided on the inner wall at the bottom end of the extension column. Any two extension columns can be connected end to end through threads.

[0014] A sample storage tube is arranged at the water outlet end. A spring cover is installed at the upper end inside the sample storage tube. The structure of the spring cover is similar to that of a floor drain. When water flows in, it can move downward to open; when there is no water flowing in from above, it seals the sample storage tube under the action of the spring.

[0015] The length of the transmission column is the same as that of the sampling tube; the water delivery plate is designed with an arc-shaped spiral leaf surface, and a flow guiding tooth with a height of 2 mm - 3 mm is provided at the edge of the water delivery plate.

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

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

[0018] A protective cover is provided on the outer shell. After the protective cover is connected to the outer shell, the inside of the outer shell is in a sealed state.

[0019] The beneficial effects of the present invention are: 1. By setting the sampling tube, the sampling tube can be selected manually or automatically according to the actual situation. The inner wall of the sampling tube is hollow. A thread for connection is provided at its upper part, and a thread for connecting the extension column is provided at its lower part. A transmission column is arranged inside the sampling tube. The length of each transmission column is the same as the length of each section of the sampling tube. When the sampling tube is extended, the transmission column can be synchronously extended through the buckle, which can improve the overall fitting degree of the device.

[0020] 2. By setting the water delivery plate, after the motor drives the topmost 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 agitation of the motor. At the same time, driven by the rotation of the transmission column, the water enters the water delivery plate, and the water is gradually sent into the sample delivery cavity through the rotation of the water delivery plate, which can stably and quickly send the water sample into the sample delivery cavity and then transfer it to the sample storage tube.

[0021] 3. When water flows into the sample feeding cavity, the water in the sample feeding cavity will increase. When the bottom end surface of the water extraction pump is level, the water delivery plate can send the water flow in the sample feeding cavity to the sample storage tube, eliminating the drawback that manual secondary operation of lifting the sampling device is required during manual sampling to obtain the water sample. Thus, it can avoid the pollution of the sample caused by environmental factors or wind factors during the secondary operation, ensuring the purity of the loaded sample.

[0022] 4. This device directly samples inside the pipe body and directly stores the obtained water sample in a tube to obtain the sample, which can avoid the accidental occurrence of secondary pollution of the water sample during manual operation, ensuring the accuracy of the sample detection parameters. The spiral water delivery plate can break bubbles and guide the water flow to flow axially, effectively preventing air blockage, avoiding water sample disturbance, being adaptable to complex working conditions such as high sediment content and rapid water flow, improving the sampling efficiency, and at the same time reducing the erosion of the inner wall of the sampling pipe by the water flow, 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 full automation of the "sampling - sealing" process, ensuring the originality of the water sample. Brief Description of the Drawings

[0023] Figure 1 It is a three - dimensional structure schematic diagram of a groundwater sampling device proposed by the present invention; Figure 2 It is a connection structure schematic diagram of the sampling pipe and the outer shell in a groundwater sampling device proposed by the present invention; Figure 3 It is a structure schematic diagram of the water delivery cavity of a groundwater sampling device proposed by the present invention; Figure 4 It is a connection schematic diagram of the transmission column and the water delivery plate in a groundwater sampling device proposed by the present invention; Figure 5 It is a structure schematic diagram of the sampling pipe in a groundwater sampling device proposed by the present invention; Figure 6 It is a connection structure schematic diagram of the sample storage tube and the adapter in a groundwater sampling device proposed by the present invention.

[0024] In the figure: 1 - protective cover; 2 - display screen; 3 - handle; 4 - outer shell; 5 - switch; 6 - second connection hole; 7 - adapter; 71 - engagement pattern; 72 - adapter; 8 - sample storage tube; 9 - first connection hole; 10 - external connection thread; 101 - lower chamber; 102 - sample feeding cavity; 103 - waterproof motor; 104 - transmission column; 105 - water delivery plate; 11 - sampling pipe; 12 - internal connection thread; 121 - connection thread; 122 - extension column; 123 - lower connection thread. Detailed Embodiments

[0025] The present invention will be further explained below in conjunction with specific embodiments.

[0026] Reference Figure 1-6 , in this embodiment, a groundwater sampling device is proposed, which includes a sampling part, a sample storage part and a control part. Among them, the control part is used to control the working state of the internal circuit structure or electronic components of the device; specifically, the control part can integrate a gyroscope and a pressure sensor to monitor the verticality of the sampling pipe 11 and the static pressure of groundwater in real time; when the device tilts more than 5° or the static pressure is abnormal, the rotation speed of the transmission column is automatically adjusted (±20%) to ensure that the depth accuracy of the sampling point is ≤ ±5 cm; the sampling part includes a housing 4, the inside of the housing 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 two openings correspond to the positions of the two openings on the bottom end of the housing 4. One opening on the housing 4 is for water inlet, and the other opening on the housing 4 is for water outlet. A columnar transmission column 104 passes through the hole for water inlet and is arranged at the lower part of the housing 4. The top end of the transmission column 104 is connected to the transmission shaft of the waterproof motor 103. The lower end surface of the transmission column 104 is concavely provided with a thread for connecting other transmission columns 104; a water delivery plate 105 is arranged around the transmission column 104. The water delivery plate 105 adopts an arc-shaped spiral leaf surface design, and the angle between the leaf surface and the axis of the transmission column is 30° - 45°, preferably 40°. The distance between adjacent water delivery plates is 5 - 8 cm, preferably 6 cm, forming a spiral rising channel. The two sides of the water delivery plate 105 are high and the middle is low. The bottom end surface of the water delivery plate 105 and the bottom end surface of the transmission column 104 are on the same horizontal plane. The outer wall of the water delivery plate 105 contacts the inner wall of the sampling pipe 11; guide teeth are arranged at the edge of the water delivery plate 105, with a tooth height of 2 - 3 mm, which is used to break the bubbles in the water flow and guide the water flow to converge towards the center of the sample delivery cavity 102; further, the water delivery plate 105 can also be connected to the transmission column 104 through an elastic hinge, and the spiral lift angle of the blade can be adaptively adjusted within the range of 30° - 60°, and guide teeth are arranged at the edge of the blade, with a tooth height of 2 - 3 mm; 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 lift angle (up to 60°) to reduce the water flow disturbance; when the flow velocity is low, the blade resets to the initial angle (30°) to ensure the sampling efficiency.

[0027] Outside the transmission column 104, a sampling tube 11 is provided. The upper end of the sampling tube 11 is screwed onto the inner wall of the first connection hole 9 at the bottom end of the outer shell 4 for water inlet; a sample storage tube 8 for storing water samples is connected to the second connection hole 6 for water outlet; the inner wall of the sample storage tube 8 is coated with a polytetrafluoroethylene (PTFE) coating to reduce liquid adhesion; a water pump is also provided in the sample delivery cavity 102, and the water pump sends the water sample temporarily stored in the sample delivery cavity 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 automatically opens; after sampling, when water does not flow in, the sample storage tube can be automatically sealed by the spring.

[0028] The sampling tube 11 is in a hollow tubular shape, and the sampling tube 11 can be extended according to requirements during use. The specific method is as follows: an internal connection thread 12 is formed on the inner wall of the bottom end of the sampling tube 11. The extension column 122 can be tightly fixed to the lower end of the sampling tube 11 through the engagement of the connection thread 121 at its top end with the internal connection thread 12. The outer wall diameter of the extension column 122 is the same as the outer wall diameter of the sampling tube 11, and the inner wall diameter of the extension column 122 is the same as 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 closely connected, the internal lumen of the sampling tube 11 and the internal lumen of the extension column 122 are in a communicating state. A lower connection thread 123 is provided at the lower end of the extension column 122. By connecting the lower connection threads 123 and the connection threads 121 on different extension columns 122, the head-to-tail connection between multiple extension columns 122 can be achieved, and the effect of extending the total length of the extension column 122 can be achieved.

[0029] A protective cover 1 is provided on the outer shell 4. After the protective cover 1 is connected to the outer shell 4, the inside of the outer shell 4 is in a sealed state; the length of the transmission column 104 is the same as 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 in an open shape, and a sealing cover is connected to the bottom end of the sample storage tube 8 by a thread.

[0030] In the existing structure, the water quality detection of shallow groundwater usually requires an operator to tie a connecting rope or a soft ruler to a bailer for sampling; this sampling method requires manual pouring out of the water sample taken in the bailer for storage or sealing. During the process of manually pouring out the water sample, the water sample is easily polluted by the environment or wind, resulting in inaccurate test results of the water sample. This device is also used to obtain water samples of shallow groundwater for water quality detection. Its intelligent structure connection is functionally connected by those skilled in the art according to common knowledge. There is no limit to the power structure model, as long as the power structure work effect in the device is achieved.

[0031] The user connects the device to an external control power supply. Since the working environment of water sample collectors is mostly outdoors and the 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-on state of the device can be controlled through a switch.

[0032] At the same time, the length of the sample storage tube 8 can be replaced according to the amount of water sample required by the user. When the diameter of the connector 7 at the upper end of the sample storage tube 8 to be replaced is equal to the diameter of the second connection hole 6, it can be directly replaced; when the diameter of the connector 7 at the upper end of the sample storage tube 8 to be replaced is smaller than or larger than the diameter of the second connection hole 6, a conversion head 72 is required; one end of the conversion head 72 is equal to the diameter of the second connection hole 6; the other end is provided with an outer wall diameter equal to the connector 7 at the upper end of the sample storage tube 8 to be replaced, and this end is provided with a biting pattern 71 connected to the connector 7. The conversion head 72 has various specifications to meet the usage requirements of sample storage tubes 8 with various diameters.

[0033] 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 waterproof effect, and the manual sampling tube 11 is extended through threaded end-to-end connection; the specifications of the sampling tube are not unique, that is, the sampling tube can have various lengths such as 10m, 8m, and 5m to meet the needs of users at different sampling depths.

[0034] To accurately determine the descending depth of the device, a wireless depth detector needs to be installed. 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 bottommost end, and a card slot is provided in the groove. The depth sensor is fixed in the card slot. The tube body with a slot is the bottom tube, and the length of the bottom tube is 30 cm. The bottom tube is screwed to the bottom end of the bottommost sampling tube 11.

[0035] First Embodiment 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, first connect the drive column 104 end to end, and then connect the sampling tube 11 according to the length of the drive column 104. After the connection of the sampling tube 11 is completed, connect the bottom tube; then connect the sample storage tube 8, the outer shell 4 and the sample delivery chamber 102. Then connect the device to the vehicle power supply. After the connection is completed, control the device to be powered on through the switch 5. The user inserts 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 through the display screen. After reaching the sampling depth, the user turns on the device through the switch. The waterproof motor 103 drives the drive column 104 to rotate. The water flow contacts the drive column 104 along with the rotation of the sampling tube 11. When the drive column 104 rotates, the spiral blade surface of the water delivery plate 105 pushes the water flow to spiral upward along the inner wall of the sampling tube 11. At the same time, the guide teeth destroy the water flow vortex to form a stable axial flow; at the same time, the suction port of the water pump generates suction, so that there is negative pressure in the sampling tube 11, and the water flow will rise along with the rotation of the water delivery plate 105 and finally reach the sample delivery chamber 102 and enter the water pump. The water pump sends 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 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 seals the sampling tube 11.

[0036] Second Embodiment When the sampling depth of the user is between 20 - 25m, an electrically telescopic sampling tube can be used. When the electric telescopic rod is fully retracted, the user connects the drive column 104 from end to end, and connects the bottom tube to the bottom of the sampling tube 11. Then, connect the sample storage tube 8, the outer shell 4, and the sample delivery chamber 102. After that, connect the device to the vehicle power supply. After the connection is completed, control the device to be powered on through the switch 5. The user inserts 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 is displayed on the display screen. After reaching the sampling depth, the user turns on the device through the switch. The waterproof motor 103 drives the drive column 104 to rotate. As the water flow rotates with the rotation of the sampling tube 11 and contacts the drive column 104, after the water delivery plate 105 on the periphery of the drive column 104 contacts the water flow, the water flow rotates with the rotation of the water delivery plate 105. At the same time, the suction port of the water pump generates suction, creating a negative pressure inside the sampling tube 11, and the water flow will rise along with the rotation of the water delivery plate 105 and finally reach the sample delivery chamber 102 and enter the water pump. The water pump sends 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 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 spring gravity cover automatically seals the sampling tube 11. The user lifts the device out. First, remove the sample storage tube 8, retract the electric telescopic rod, and then remove the drive column 104.

[0037] Third Embodiment There is no display screen on the outer shell 4. A handle is provided on the protective cover 1, and a flexible ruler is tied to the handle. The user can judge the depth of the device according to the descending length of the flexible ruler. Therefore, when in use, since there is no need for a wireless depth detector to detect the depth, there is no need to connect the bottom tube to the bottom of the sampling tube 11. The user lowers the device through the flexible ruler. After reaching the appropriate height, connect the device to the vehicle power supply to turn 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.

[0038] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope 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 internal circuit structure or electronic components of the device. It is characterized in that the sampling part includes a housing (4). The interior of the housing (4) has a cavity. Inside the cavity, a sample delivery chamber (102) is installed. The bottom end face of the sample delivery chamber (102) has two openings. The opening positions of the two openings correspond to the positions of two openings on the bottom end of the housing (4). One opening on the housing (4) is for water inlet, and the other opening on the housing (4) is for water outlet. A columnar drive column (104) passes through the hole for water inlet and is arranged at the lower part of the housing (4). The top end of the drive column (104) is connected to the transmission shaft of a waterproof motor (103). The lower end face of the drive column (104) is recessed with a thread for connecting other drive columns (104). A water delivery plate (105) is arranged around the drive column (104). The water delivery plate (105) is arc-shaped and the two sides of the water delivery plate (105) are high and the middle is low. The bottom end face of the water delivery plate (105) and the bottom end face of the drive column (104) are on the same horizontal plane. An external sampling tube (11) is arranged outside the drive column (104). The upper end of the sampling tube (11) is screwed to the inner wall of the first connection hole (9) for water inlet at the bottom end of the housing (4) through an external connection thread (10). A sample storage tube (8) for storing the water sample is connected to the second connection hole (6) for water outlet. A water pump is also arranged in the sample delivery chamber (102). The water pump sends the water sample temporarily stored in the sample delivery chamber (102) into the sample storage tube (8). A spring cover is arranged 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 drive column (104) is the same as the length of the sampling tube (11). The water delivery plate (105) adopts an arc-shaped spiral leaf surface design, and guide teeth with a height of 2 - 3 mm are arranged at the edge of the water delivery plate (105).

3. The groundwater sampling device according to claim 2, wherein, The sampling tube (11) includes a manually thread-connected extended type and an electrically telescopic type. Its bottom end can be screwed to a bottom end tube, and a depth sensor is fixed in the outer wall groove of the bottom end tube. The bottom end face of the sampling tube (11) is flush with the bottom end face of the drive column (104) or the bottom end face of the sampling tube (11) is 3 - 5 cm lower than the bottom end face of the drive column (104).

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

5. The groundwater sampling device according to claim 1, wherein A protective cover (1) is arranged on the housing (4). 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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