A groundwater stratification pumping test auxiliary device

Abstract

The present invention belongs to the technical field of water sampling and detection, and in particular, relates to an auxiliary device for groundwater stratified pumping test, including a sealing airbag and a pipeline assembly, wherein the pipeline assembly includes an upper connecting pipe, an intermediate connecting pipe and a lower connecting pipe connected in sequence, and the outer walls of the upper connecting pipe and the lower connecting pipe are respectively provided with sealing airbags; an air source distributor is provided on the inner wall of the upper end of the intermediate connecting pipe, and the air inlet of the air source distributor is connected to an air inlet pipe; a plurality of sampling holes are evenly distributed on the circumference of the bottom end of the intermediate connecting pipe; a piston assembly is slidably provided on the inner wall of the intermediate connecting pipe, and the piston assembly is connected to the air source distributor through a spring 1, and the two air outlets of the air source distributor are respectively connected to the sealing airbags at the upper and lower ends through a pipeline 1 and a pipeline 2; the air source distributor also has an adjustable air outlet joint for inflating the inside of the intermediate connecting pipe. The device will not leak water during the diving process, ensuring the accuracy of sampling, and can achieve deeper water sampling operations in a small volume of space.

Description

Technical Field

[0001] The invention belongs to the technical field of water body sampling and detection, and in particular relates to an auxiliary device for groundwater stratification pumping test. Background Art

[0002] In the process of geothermal resource development, it is necessary to comprehensively carry out geothermal geological surveys, geophysical prospecting, geothermal drilling, well logging, and water quality testing to preliminarily ascertain the geological conditions such as the strata, geological structure, and magmatic activity in the working area, preliminarily ascertain the characteristics of the geothermal field, the characteristics of the geothermal resource occurrence and distribution patterns, ascertain the physical properties and chemical composition of the geothermal fluid, and evaluate the quality of geothermal water; evaluate the amount of geothermal resources, carry out development and utilization research, and provide a basis for the rational development and utilization of geothermal resources in the working area.

[0003] In geothermal geological surveys, geothermal geological drilling, pumping tests, water sample collection and testing are required. At present, the geothermal water collection and experiment uses an integrated device with upper and lower packers connected to a submersible pump. The whole device is placed inside the casing, and the submersible pump is lowered to the pumping target section. The pumping test can be carried out by turning on the water pump. However, in actual applications, due to the limitation of the borehole diameter used for the water stratification pumping test, the submersible pumps used for the stratification pumping test are all customized small-diameter submersible pumps, and their lowered working depth is limited. When the water depth of the pumping test is required to be deeper, the pumping operation cannot be carried out; if a submersible pump with a large diving depth is used, its volume size cannot meet the requirements of being placed in the borehole; secondly, due to the use of a submersible pump for the pumping test, during the submersible pump diving process, some seepage water easily enters the submersible pump, resulting in the mixing of water quality of different depth layers during subsequent pumping, resulting in problems in water sampling. Summary of the invention

[0004] In view of the technical problems in the background technology that the submersible pump water sampling device has a limited diving depth and is easy to mix water bodies at different depths during the diving process, the present invention provides a groundwater stratified pumping test auxiliary device.

[0005] To achieve the above purpose, the technical solution provided by the present invention is:

[0006] A groundwater stratified pumping test auxiliary device comprises a casing, a sealing air bag, and a pipeline assembly, wherein the casing is arranged on the inner wall of a test well, and the pipeline assembly comprises an upper connecting pipe, an intermediate connecting pipe, and a lower connecting pipe which are connected in sequence, and the outer walls of the upper connecting pipe and the lower connecting pipe are respectively provided with sealing air bags, and the sealing air bags are arranged close to the inner wall of the casing; a lifting rope is arranged at the upper end of the upper connecting pipe, and the lifting rope is connected to a retractable mechanism outside the test well; an air source distributor is arranged on the inner wall of the upper end of the intermediate connecting pipe, and the air inlet of the air source distributor is connected to an air inlet pipe, and the air inlet pipe passes upward from the inside of the upper connecting pipe and is connected to the retractable mechanism outside the test well. Mechanism connection; a plurality of sampling holes are evenly distributed on the circumference of the bottom end of the intermediate connecting tube; a piston assembly is slidably provided on the inner wall of the intermediate connecting tube, the piston assembly is connected to the gas source distributor through a spring 1, the gas source distributor is connected to the sealing air bag at the upper end through a pipe 1, the gas source distributor is connected to the sealing air bag at the lower end through a pipe 2, the piston assembly is a hollow structure, and the second part of the pipe is passed through the interior of the piston assembly; the gas source distributor also has an adjustable air outlet joint, the adjustable air outlet joint is arranged inside the intermediate connecting tube, and the adjustable air outlet joint is used to inflate the interior of the intermediate connecting tube to push the piston assembly down to close the sampling holes.

[0007] Optionally, the two ends of the upper connecting pipe are respectively provided with a first connecting flange, the two ends of the middle connecting pipe are respectively provided with a second connecting flange, and the two ends of the lower connecting pipe are respectively provided with a third connecting flange; the second connecting flanges at the two ends of the middle connecting pipe are respectively connected and fixed to the first connecting flange and the third connecting flange.

[0008] Optionally, the piston assembly includes a first piston and a second piston, the bottom end of the first piston is evenly distributed with a plurality of sliding rods, the upper end of the second piston is provided with a convex column, the outer diameter of the convex column is smaller than the outer diameter of the second piston, and an annular overflow cavity is formed between the inner wall of the intermediate connecting tube and the outer wall of the convex column; the circumference of the second piston and the convex column is evenly distributed with a plurality of sliding holes, the sliding rods are respectively slidably arranged in the sliding holes, a second spring is arranged in the sliding hole, and the second spring is connected to the sliding rod; a central hole is arranged inside the second piston; the interior of the lower connecting tube is separated into a first sampling cavity and a second sampling cavity by a partition The first through hole is connected to the second through hole of the second connecting flange at the bottom of the intermediate connecting tube, and the second through hole is directly opposite to the first through hole. The second through hole and the first sampling chamber are connected through the first sampling tube. The center of the one-way valve is provided with a third through hole, the second pipe is penetrated in the center hole, and the second end of the pipe is connected to the third through hole. The bottom end of the third through hole is connected with the pipe three, and the pipe three is connected to the sealing air bag outside the lower connecting tube. The upper end of the one-way valve is provided with an annular groove, and the bottom end of the annular groove is provided with a fourth through hole. The fourth through hole and the second sampling cavity are connected through the second sampling tube. A valve body is arranged in the conical valve port of the fourth through hole. A spring three is arranged on the valve body. A filter cartridge is arranged in the annular groove. One end of the spring three is connected to the filter cartridge. The spring three drives the valve body to close the fourth through hole. An annular magnet is arranged at the bottom end of the second piston. When the spring one is not stretched and the spring two is not compressed, the spring two drives the first piston and the second piston to separate from each other, and the first piston and the second piston are suspended away from the sampling hole. The water flowing into the sampling hole flows into the first sampling tube through the first sampling tube. In the first sampling cavity; when the spring one is stretched by force and the spring two is not compressed by force, the bottom end of the second piston is set tightly against the bottom wall of the middle connecting tube, the magnet causes the valve body to rise and open the fourth through hole, and the spring two drives the first piston and the second piston to separate from each other, and the water flowing into the sampling hole reaches the overflow cavity and flows into the second sampling cavity through the center hole, the annular groove, the fourth through hole and the second sampling tube; when the spring one is stretched by force and the spring two is compressed by force, the bottom end of the second piston is set tightly against the bottom wall of the middle connecting tube, and the first piston and the second piston are tightly against each other to close the sampling hole.

[0009] Optionally, a sealing ring is provided on the inner wall of the first piston, and the second pipe is provided close to the inner wall of the sealing ring.

[0010] Optionally, the sealing airbag has an air inlet connector, and the air inlet connector extends into the interior of the upper connecting tube or the lower connecting tube.

[0011] Optionally, a first drain port and a second drain port are provided on the third connecting flange at the bottom end of the lower connecting pipe, the first drain port is communicated with the first sampling cavity, and the second drain port is communicated with the second sampling cavity.

[0012] Optionally, the inner walls of the first connecting flanges at both ends of the upper connecting tube are arranged in close contact with the end surface of the sealing airbag; the inner walls of the third connecting flanges at both ends of the lower connecting tube are arranged in close contact with the end surface of the sealing airbag.

[0013] Optionally, a connecting hole is provided on the second connecting flange, threaded holes are provided on the first connecting flange and the third connecting flange, the first connecting flange and the second connecting flange are connected by locking screws, and the third connecting flange and the second connecting flange are connected by locking screws.

[0014] Optionally, a plurality of water-stopping expansion members are provided on the outer wall of the casing, and the water-stopping expansion members are arranged close to the inner wall of the test well, and the positions of the water-stopping expansion members correspond one to one with the positions of the isolation airbags.

[0015] The present invention has the following advantages and beneficial effects:

[0016] In the present invention, the groundwater stratified pumping test auxiliary device includes a sealing air bag and a pipeline assembly, and the air source distributor, various air pipes, etc. are all arranged inside the pipeline assembly to avoid being affected by the water body.

[0017] In the present invention, the entire test device can be lowered along with the rope, and water sampling can be carried out using the pipeline assembly, that is, the sampling hole at the bottom end of the middle connecting pipe. During the lowering process, air is inflated inside the middle connecting pipe to make the piston assembly descend to close the sampling hole, ensuring that no water seepage occurs during the diving process, and that water from different depth layers will not be mixed during subsequent pumping / sampling, thereby ensuring the accuracy of sampling.

[0018] In the present invention, the design of the sampling hole can replace the submersible pump. After removing the submersible pump, a deeper water sampling operation can be achieved in a small space. When the piston assembly moves upward, the internal suction of the middle connecting pipe generates negative pressure, and the outer water is sucked inward through the sampling hole, making it easier to achieve water sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of the groundwater stratification pumping test auxiliary device of the present invention arranged in a test well;

[0020] Figure 2 for Figure 1 A partial enlarged view of the structure in the middle;

[0021] Figure 3 It is a partial structural cross-sectional view of the groundwater stratification pumping test auxiliary device in the present invention;

[0022] Figure 4 for Figure 3 A partial enlarged view of the structure in the middle;

[0023] Figure 5 It is a cross-sectional view of the piston assembly closing the sampling hole in the present invention;

[0024] Figure 6 for Figure 5 A partial enlarged view of the structure in the middle;

[0025] Figure 7 A cross-sectional view of the piston assembly of the present invention opening a sampling hole to implement sampling of a first depth sampling layer;

[0026] Figure 8 for Figure 7 A partial enlarged view of the structure in the middle;

[0027] Fig. 9 A cross-sectional view of the piston assembly of the present invention opening a sampling hole to implement sampling of a second depth sampling layer;

[0028] Fig.10 for Fig. 9 A partial enlarged view of the structure in the middle;

[0029] Fig.11 It is a cross-sectional view of the one-way valve in the present invention.

[0030] Figure numerals: 1-test well, 2-casing, 21-water-stop expansion member, 3-upper connecting pipe, 31-first connecting flange, 32-hanging rope, 4-sealing airbag, 41-air inlet joint, 5-middle connecting pipe, 51-sampling hole, 52-second connecting flange, 53-locking screw, 54-first through hole, 6-lower connecting pipe, 6a-first sampling cavity, 6b-second sampling cavity, 61-third connecting flange, 62-first drain port, 63-second drain port, 64-partition, 65-first sampling pipe, 66-second sampling pipe , 67-second through hole, 7-inlet pipe, 71-gas source distributor, 72-pipeline two, 73-pipeline one, 74-adjusting air outlet joint, 75-one-way valve, 751-ring groove, 752-fourth through hole, 753-third through hole, 754-filter cartridge, 755-spring three, 756-valve body, 76-pipeline three, 77-spring one, 8-first piston, 8a-overflow chamber, 81-slide rod, 82-second piston, 821-center hole, 822-magnet, 83-convex column, 84-spring two, 85-sealing ring. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example 1

[0034] like Figures 1 to 11 As shown, a groundwater stratified pumping test auxiliary device includes a casing 2, a sealing air bag 4, a pipeline component, etc.

[0035] like Figure 1 As shown, the casing 2 is arranged on the inner wall of the test well 1, and the isolation airbag 4 and the pipeline assembly are arranged in the casing 2. The casing 2 is selected so that it has filtering holes or water seepage holes, so that the water in the soil layer can penetrate into the casing 2.

[0036] like Figures 1 to 3 As shown, the pipeline assembly includes an upper connecting pipe 3, an intermediate connecting pipe 5 and a lower connecting pipe 6 which are connected in sequence, and the three are detachably connected. The outer walls of the upper connecting pipe 3 and the lower connecting pipe 6 are respectively provided with sealing airbags 4, and the sealing airbags 4 are arranged close to the inner wall of the casing 2. By the upper and lower sealing airbags 4 being close to the inner wall of the casing 2, a sampling cavity for sampling is enclosed in the casing 2 and between the two sealing airbags 4, and the outer wall of the test well 1 seeps water into the casing 2 between the two sealing airbags 4, and the next step of sampling operation can be realized.

[0037] like Figure 1 As shown, a lifting rope 32 is provided at the upper end of the upper connecting pipe 3, and the lifting rope 32 is connected to the retracting mechanism outside the test well 1. The retracting mechanism can adopt a winch, etc., so that the groundwater stratified pumping test auxiliary device can be lowered as a whole to different depths for sampling.

[0038] like Figure 1 , Figure 3As shown, the inner wall of the upper end of the middle connecting pipe 5 is provided with a gas source distributor 71, and the gas inlet of the gas source distributor 71 is connected to the gas inlet pipe 7, and the gas inlet pipe 7 passes upward from the inside of the upper connecting pipe 3 and is connected to the retractable mechanism outside the test well 1. The gas source distributor 71 is a device for distributing and regulating the gas flow. In the present invention, its main function is to distribute the gas supplied by the gas inlet pipe 7 to multiple gas use points through the gas source distributor 71 to ensure the stability and reliability of the gas supply. Secondly, the gas source distributor 71 is also equipped with a corresponding electromagnetic control system to control the on and off of the gas source at each gas use point. The specific structure is not repeated. The control of the electromagnetic control system and the gas source distributor 71 can be realized by remote control or by directly connecting the control line to lead the control line out of the test well 1. In the present invention, the gas source distributor 71 is also equipped with an exhaust valve to realize the exhaust operation of each gas-using equipment (sealing airbag 4 and piston assembly).

[0039] like Figures 1 to 11 As shown, a plurality of sampling holes 51 are evenly distributed on the circumference of the bottom end of the intermediate connecting tube 5; a piston assembly is slidably provided on the inner wall of the intermediate connecting tube 5, and the piston assembly is connected to the gas source distributor 71 through a spring 1 77, and the gas source distributor 71 has a plurality of gas outlets, one of the gas outlets of the gas source distributor 71 is connected to the sealing airbag 4 at the upper end through a pipe 1 73, and the other gas outlet of the gas source distributor 71 is connected to the sealing airbag 4 at the lower end through a pipe 2 72, wherein the pipe 1 73 is upwardly connected to the sealing airbag 4 on the upper connecting tube 3, and wherein the pipe 2 72 is downwardly connected to the sealing airbag 4 on the lower connecting tube 6, and the piston assembly is a hollow structure, and a portion of the pipe 2 72 is passed through the interior of the piston assembly; the gas source distributor 71 also has an adjustable gas outlet joint 74, and the adjustable gas outlet joint 74 is arranged inside the intermediate connecting tube 5, and the adjustable gas outlet joint 74 is used to inflate the interior of the intermediate connecting tube 5 to push the piston assembly down to close the sampling holes 51.

[0040] In the present invention, the gas source distributor 71, the control system, the gas pipes, etc. are all arranged inside the pipeline assembly to avoid being affected by the water body.

[0041] In the present invention, the entire test device can be lowered along with the lifting rope 32, and water sampling can be carried out using the pipeline assembly, that is, the sampling hole 51 at the bottom end of the intermediate connecting pipe 5. During the lowering process, air is inflated inside the intermediate connecting pipe 5 to make the piston assembly descend to close the sampling hole 51, ensuring that there will be no water seepage during the diving process, and that water quality from different depth layers will not be mixed during subsequent pumping / sampling, thereby ensuring the accuracy of sampling.

[0042] In the present invention, the design of the sampling hole 51 can replace the submersible pump. After removing the submersible pump, a deeper water sampling operation can be achieved in a small space. When the piston assembly moves upward, the internal suction of the middle connecting pipe 5 generates negative pressure, and the outer water is sucked inward through the sampling hole 51, making it easier to achieve water sampling.

[0043] Example 2

[0044] In order to further realize the water sampling operation at different depth layers, reduce the design of control equipment and simplify the composition of the sampling equipment in the well, further optimize the design.

[0045] like Figures 1 to 3 As shown, the two ends of the upper connecting pipe 3 are respectively provided with a first connecting flange 31, the two ends of the middle connecting pipe 5 are respectively provided with a second connecting flange 52, and the two ends of the lower connecting pipe 6 are respectively provided with a third connecting flange 61; the second connecting flanges 52 at the two ends of the middle connecting pipe 5 are respectively connected and fixed to the first connecting flange 31 and the third connecting flange 61, thereby realizing a detachable connection among the upper connecting pipe 3, the middle connecting pipe 5 and the lower connecting pipe 6.

[0046] like Figures 1 to 10 As shown, the piston assembly includes a first piston 8 and a second piston 82. The first piston 8 and the second piston 82 slide closely against the inner wall of the intermediate connecting pipe 5. The outer walls of the first piston 8 and the second piston 82 are provided with sealing members (not shown in the figure) to enhance the air tightness of the piston assembly. The bottom end of the first piston 8 is evenly distributed with a plurality of sliding rods 81. The upper end of the second piston 82 is provided with a convex column 83. The outer diameter of the convex column 83 is smaller than the outer diameter of the second piston 82. An annular overflow cavity 8a (such as Figure 6 As shown). The second piston 82 and the convex column 83 are evenly distributed with a plurality of sliding holes, and the sliding rods 81 are respectively slidably arranged in the sliding holes, and the sliding holes are provided with springs 84, and the springs 84 are connected to the sliding rods 81; the interior of the second piston 82 is provided with a central hole 821, and the interior of the first piston 8 is hollow.

[0047] like Figures 1 to 10 As shown, the interior of the lower connecting pipe 6 is separated into a first sampling chamber 6a and a second sampling chamber 6b by a partition 64; a one-way valve 75 and a first through hole 54 are arranged inside the second connecting flange 52 at the bottom end of the intermediate connecting pipe 5, and a second through hole 67 opposite to the first through hole 54 is arranged inside the third connecting flange 61 at the upper end of the lower connecting pipe 6, and the second through hole 67 and the first sampling chamber 6a are connected through the first sampling pipe 65.

[0048] like Figures 1 to 11As shown, the center of the one-way valve 75 is provided with a third through hole 753, the second pipe 72 passes through the first piston 8 and the second piston 82, the second pipe 72 is arranged in the center hole 821, and the end of the second pipe 72 is connected to the third through hole 753, the bottom end of the third through hole 753 is connected to the third pipe 76, and the third pipe 76 is connected to the sealing air bag 4 outside the lower connecting pipe 6. The upper end of the one-way valve 75 is provided with an annular groove 751, the annular groove 751 is arranged outside the third through hole 753, and the bottom end of the annular groove 751 is penetrated with a fourth through hole 752, and the fourth through hole 752 and the second sampling chamber 6b are connected through the second sampling tube 66. A valve body 756 is arranged in the conical valve port of the fourth through hole 752, a spring 3 755 is arranged on the valve body 756, a filter cartridge 754 is arranged in the annular groove 751, one end of the spring 3 755 is connected to the filter cartridge 754, and the spring 3 755 drives the valve body 756 to close the fourth through hole 752; an annular magnet 822 is arranged at the bottom end of the second piston 82. The bottom end of the magnet 822 can extend into the annular groove 751, or be flush with the bottom end of the second piston 82.

[0049] like Figures 7-10 As shown, the arrow shown in the figure indicates the flow direction of water sampling, that is, the flow direction of the water in the test well 1 into the middle connecting pipe 5 for sampling.

[0050] like Fig. 9 , Fig.10 As shown, when the spring 1 77 is not stretched and the spring 2 84 is not compressed, that is, the air source distributor 71 does not supply air to the middle connecting pipe 5, the spring 2 84 drives the first piston 8 and the second piston 82 to separate from each other, and the first piston 8 and the second piston 82 are suspended away from the sampling hole 51, that is, the spring 2 84 pulls the first piston 8 and the second piston 82 to be suspended, and the water flowing into the sampling hole 51 flows into the first sampling cavity 6a through the first through hole 54, the second through hole 67, and the first sampling tube 65 in sequence, thereby realizing the water sampling operation at the first depth layer.

[0051] like Figure 7 , Figure 8 , Fig.11As shown, when the spring 1 77 is stretched by force and the spring 2 84 is not compressed by force, that is, the air source distributor 71 supplies air to the middle connecting pipe 5, at this time, the pressure in the inner cavity of the middle connecting pipe 5 is recorded as P1, and the gas pushes the first piston 8 and the second piston 82 to move downward synchronously, and the spring 1 77 is stretched, so that the bottom end of the second piston 82 is set close to the bottom wall of the middle connecting pipe 5, but cannot further drive the first piston 8 to move relative to the second piston 82. The spring 2 84 drives the first piston 8 and the second piston 82 to separate from each other. When the second piston 82 reaches the bottom end, the magnet 822 approaches the one-way valve 75, and the magnetic attraction causes the valve body 756 to rise, thereby opening the fourth through hole 752. The water flowing into the sampling hole 51 reaches the overflow cavity 8a and then flows into the second sampling cavity 6b through the gap between the first piston 8 and the second piston 82, the center hole 821, the annular groove 751, the fourth through hole 752, and the second sampling tube 66 in sequence, thereby realizing the water sampling operation at another depth layer.

[0052] like Figure 5 , Figure 6 As shown, when spring 1 77 is stretched and spring 2 84 is compressed, that is, the gas source distributor 71 supplies gas to the middle connecting tube 5, the pressure in the inner cavity of the middle connecting tube 5 is recorded as P2, P2 is greater than P1, and the gas pushes the first piston 8 and the second piston 82 to move downward synchronously, and the spring 1 77 is stretched, so that the bottom end of the second piston 82 is set close to the bottom wall of the middle connecting tube 5, and the internal pressure further pushes the first piston 8 to move, so that the first piston 8 moves downward relative to the static second piston 82 until the first piston 8 and the second piston 82 are close to each other. When the first piston 8 and the second piston 82 are close to each other, the sampling hole 51 is completely closed. In this case, the entire test device can dive or rise, and the water outside will not penetrate, which will not affect the diving before sampling or the lifting operation after sampling.

[0053] In the present invention, before sampling, when diving, the test device needs to Figure 5 and Figure 6 In the state shown, the test device dives to the sampling position, and then gradually discharges the pressure inside the intermediate connecting pipe 5, so that the pressure gradually decreases from P2 to P1, so that the test device Figure 7 and Figure 8 The state shown in the figure completes the first sampling first; then the middle connecting tube is pressed to P2 and reset to Figure 5 and Figure 6 The test device continues to dive to the second sampling position in the state shown, and then quickly vents the pressure in the intermediate connecting pipe to quickly reduce it to below P1. The spring 77 pulls the piston assembly up, so that the test device is Fig. 9 and Fig.10 The second sampling is completed in the state shown. After the sampling is completed, the air is quickly supplied to the middle connecting pipe so that the pressure quickly reaches P2 and resets to Figure 5 and Figure 6 The state shown in the figure realizes the lifting operation after sampling.

[0054] In the present invention, this sampling structure replaces the water sampling method of the submersible pump, and can realize the deep diving sampling operation. The sampling structure is designed by utilizing the characteristic that the sealing airbag 4 itself needs an air source, and the air source is used to drive the movement of the piston assembly to realize the switching and closing of different water sampling channels, so as to realize the water sampling operation at two depth layers. This structure does not need to use various control components, and can realize water sampling accurately and quickly. The overall structure is simple and ingenious, and the sampling structure is integrated inside the pipeline assembly without occupying the space of the test device.

[0055] like Figure 8 As shown, further, a sealing ring 85 is provided on the inner wall of the first piston 8, and the second pipe 72 is arranged close to the inner wall of the sealing ring 85 to ensure the air tightness of the piston assembly.

[0056] like Figure 3 , Figure 4 As shown, further, the sealing airbag 4 has an air inlet connector 41, which extends into the upper connecting tube 3 or the lower connecting tube 6, and the air inlet point of the sealing airbag 4 is set inside the pipeline assembly to further realize the integrated design.

[0057] like Figure 2 As shown, a first drain port 62 and a second drain port 63 are provided on the third connection flange 61 at the bottom end of the lower connection pipe 6. The first drain port 62 is connected to the first sampling chamber 6a, and the second drain port 63 is connected to the second sampling chamber 6b. After sampling is completed, the entire test device is taken out of the test well 1, and the sampled water can be taken out through the first drain port 62 and the second drain port 63.

[0058] like Figure 1 and Figure 2 As shown, the inner walls of the first connecting flanges 31 at both ends of the upper connecting tube 3 are arranged in close contact with the end face of the sealing airbag 4; the inner walls of the third connecting flanges 61 at both ends of the lower connecting tube 6 are arranged in close contact with the end face of the sealing airbag 4, and the first connecting flange 31 and the second connecting flange 52 are used to limit and fix the sealing airbag 4, so that it can be stably installed on the upper connecting tube 3 and the lower connecting tube 6.

[0059] like Figure 3 and Figure 4As shown, a connecting hole is provided on the second connecting flange 52, and threaded holes are provided on the first connecting flange 31 and the third connecting flange 61. The first connecting flange 31 and the second connecting flange 52 are connected by locking screws 53, and the third connecting flange 61 and the second connecting flange 52 are connected by locking screws 53. In this way, the installation and fixation of the upper connecting tube 3 and the middle connecting tube 5, as well as the middle connecting tube 5 and the lower connecting tube 6 can be realized without affecting the installation of the sealing airbag 4.

[0060] like Figure 1 and Figure 2 As shown, in the present invention, the outer wall of the casing 2 is provided with a plurality of water-stopping expansion members 21, and the water-stopping expansion members 21 are arranged close to the inner wall of the test well 1, and the positions of the water-stopping expansion members 21 correspond to the positions of the isolation airbags 4. The water-stopping expansion members 21 can be made of a water-swellable rubber material, and after swelling in water, the gap between the casing 2 and the wall of the test well 1 is sealed. By installing the water-stopping expansion members 21 on the outer wall of the casing 2 outside the isolation airbag 4, a sealing effect can be achieved to prevent the moisture of the upper and lower layers from penetrating into the casing 2 and then entering the sampling layer to affect the accuracy of water sampling.

[0061] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An auxiliary device for groundwater stratification pumping test, comprising a casing, a sealing air bag and a pipeline assembly, wherein the casing is arranged on the inner wall of a test well, and is characterized in that: The pipeline assembly comprises an upper connecting pipe, an intermediate connecting pipe and a lower connecting pipe which are connected in sequence, and the outer walls of the upper connecting pipe and the lower connecting pipe are respectively provided with sealing air bags, and the sealing air bags are arranged closely against the inner wall of the casing; A suspension rope is provided at the upper end of the upper connecting pipe, and the suspension rope is connected to a retractable mechanism outside the test well; The inner wall of the upper end of the intermediate connecting pipe is provided with an air source distributor, the air inlet of the air source distributor is connected with an air inlet pipe, the air inlet pipe passes upward from the inside of the upper connecting pipe and is connected to the retractable mechanism outside the test well; A number of sampling holes are evenly distributed on the circumference of the bottom end of the intermediate connecting tube; a piston assembly is slidably provided on the inner wall of the intermediate connecting tube, the piston assembly is connected to the gas source distributor through spring 1, the gas source distributor is connected to the sealing airbag at the upper end through pipe 1, the gas source distributor is connected to the sealing airbag at the lower end through pipe 2, the piston assembly is a hollow structure, and the second part of the pipe is passed through the interior of the piston assembly; the gas source distributor also has an adjustable air outlet joint, the adjustable air outlet joint is arranged inside the intermediate connecting tube, and the adjustable air outlet joint is used to inflate the interior of the intermediate connecting tube to push the piston assembly down to close the sampling holes.

2. The groundwater stratification pumping test auxiliary device according to claim 1 is characterized in that: The two ends of the upper connecting pipe are respectively provided with a first connecting flange, the two ends of the middle connecting pipe are respectively provided with a second connecting flange, and the two ends of the lower connecting pipe are respectively provided with a third connecting flange; the second connecting flanges at the two ends of the middle connecting pipe are respectively connected and fixed to the first connecting flange and the third connecting flange.

3. The groundwater stratification pumping test auxiliary device according to claim 2 is characterized in that: The piston assembly comprises a first piston and a second piston, a plurality of sliding rods are evenly distributed at the bottom end of the first piston, a convex column is arranged at the upper end of the second piston, the outer diameter of the convex column is smaller than the outer diameter of the second piston, and an annular overflow cavity is formed between the inner wall of the intermediate connecting pipe and the outer wall of the convex column; The second piston and the convex column are evenly distributed with a plurality of sliding holes, the sliding rods are slidably arranged in the sliding holes, a second spring is arranged in the sliding hole, and the second spring is connected to the sliding rod; the second piston is provided with a central hole inside; The interior of the lower connecting pipe is divided into a first sampling chamber and a second sampling chamber by a partition; a one-way valve and a first through hole are arranged inside the second connecting flange at the bottom end of the intermediate connecting pipe, and a second through hole facing the first through hole is arranged inside the third connecting flange at the upper end of the lower connecting pipe, and the second through hole and the first sampling chamber are connected through the first sampling pipe; A third through hole is provided at the center of the one-way valve, the second pipe is penetrated in the central hole, and the second end of the second pipe is connected to the third through hole, the bottom end of the third through hole is connected to the third pipe, and the third pipe is connected to the sealing air bag outside the lower connecting pipe; an annular groove is provided at the upper end of the one-way valve, and a fourth through hole is provided at the bottom end of the annular groove, and the fourth through hole is communicated with the second sampling cavity through the second sampling tube, and a valve body is provided in the conical valve port of the fourth through hole, and a spring three is provided on the valve body, and a filter cartridge is provided in the annular groove, one end of the spring three is connected to the filter cartridge, and the spring three drives the valve body to close the fourth through hole; an annular magnet is provided at the bottom end of the second piston; When the first spring is not stretched under force and the second spring is not compressed under force, the second spring drives the first piston and the second piston to separate from each other, and the first piston and the second piston are suspended away from the sampling hole, and the water flowing into the sampling hole flows into the first sampling cavity through the first sampling tube; When the spring 1 is stretched by force and the spring 2 is not compressed by force, the bottom end of the second piston is set close to the bottom wall of the middle connecting pipe, the magnet causes the valve body to rise and open the fourth through hole, and the spring 2 drives the first piston and the second piston to separate from each other, and the water flowing into the sampling hole reaches the overflow cavity and flows into the second sampling cavity through the center hole, the annular groove, the fourth through hole, and the second sampling tube; When the spring 1 is stretched by force and the spring 2 is compressed by force, the bottom end of the second piston is arranged close to the bottom wall of the middle connecting tube, and the first piston and the second piston are close to each other to close the sampling hole.

4. The groundwater stratification pumping test auxiliary device according to claim 3 is characterized in that: The inner wall of the first piston is provided with a sealing ring, and the second pipeline is arranged close to the inner wall of the sealing ring.

5. The groundwater stratification pumping test auxiliary device according to claim 2 is characterized in that: The sealing airbag has an air inlet connector, and the air inlet connector extends into the interior of the upper connecting tube or the lower connecting tube.

6. The groundwater stratification pumping test auxiliary device according to claim 3 is characterized by: A first drain port and a second drain port are provided on the third connecting flange at the bottom end of the lower connecting pipe. The first drain port is communicated with the first sampling cavity, and the second drain port is communicated with the second sampling cavity.

7. The groundwater stratification pumping test auxiliary device according to claim 3 is characterized by: The inner walls of the first connecting flanges at both ends of the upper connecting tube are arranged closely to the end surface of the sealing airbag; the inner walls of the third connecting flanges at both ends of the lower connecting tube are arranged closely to the end surface of the sealing airbag.

8. The groundwater stratification pumping test auxiliary device according to claim 7 is characterized in that: The second connecting flange is provided with a connecting hole, the first connecting flange and the third connecting flange are provided with threaded holes, the first connecting flange and the second connecting flange are connected by locking screws, and the third connecting flange and the second connecting flange are connected by locking screws.

9. The groundwater stratification pumping test auxiliary device according to claim 1, characterized in that: The outer wall of the casing is provided with a plurality of water-stopping expansion members, and the water-stopping expansion members are arranged close to the inner wall of the test well, and the positions of the water-stopping expansion members correspond one to one with the positions of the isolation airbags.

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