CN112964506A - Sleeve type gas-driven underground water sampling device - Google Patents
Sleeve type gas-driven underground water sampling device Download PDFInfo
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- CN112964506A CN112964506A CN202110248559.6A CN202110248559A CN112964506A CN 112964506 A CN112964506 A CN 112964506A CN 202110248559 A CN202110248559 A CN 202110248559A CN 112964506 A CN112964506 A CN 112964506A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N2001/1031—Sampling from special places
Abstract
The invention discloses a sleeve type gas-driven underground water sampling device which comprises a control unit, wherein the control unit comprises a high-pressure gas source and a controller, the high-pressure gas source is fixedly connected with the controller through a three-way valve, a transmission unit consists of two PU inner pipe pipelines and an outer pipe pipeline, the outer parts of the two pipelines are wrapped by smooth plastic films, and the diameter of the whole transmission pipeline is less than 20 mm; the replacement unit comprises stainless steel pipe material, and there are two mouths on replacement room upper portion, be an air inlet and a delivery port respectively, and 1 diameter of delivery port internal connection is less than 10 mm's stainless steel pipe, and outer tube and inner tube are the PU material, and gaseous input in the middle of outer tube and the inner tube is followed in the time of the sample, and the water sample flows out from the inner tube, and the sealing washer is adopted to the inner and outer pipe entrance to seal the isolation. The outer diameter of the whole transmission pipeline is smaller than 20mm, the outer wall is smooth, and well blocking risks are greatly reduced.
Description
Technical Field
The invention relates to a research device and the technical field in the field of environmental science, in particular to a sleeve type gas-driven underground water sampling device.
Background
In geological exploration and environmental investigation work, it is often necessary to newly drill a hydrological hole and collect groundwater in the hole. The domestic and foreign groundwater sampling devices are roughly classified into 4 types, namely sampling cylinder type samplers, inertial type samplers, submersible electric pump type samplers and gas driven type samplers, and the sampling devices required for different sampling purposes, aperture, water level depth and the like are different. The sampling cylinder type sampler has simple principle, convenient manufacture and low cost, is less influenced by the aperture and the sampling depth of the monitoring well, but has extremely low sampling efficiency and is not suitable for continuous sampling of underground water of a deep well; the inertial sampler has small outer diameter, can be applied to small-caliber underground water monitoring wells, and has the defects of limited sampling depth, low efficiency and large disturbance to water bodies; the submersible electric pump type sampler has high sampling efficiency, and has the defects of large equipment volume, more pipelines, high well clamping risk, large disturbance to a water body and inapplicability to sampling small-aperture underground water of a deep well; the gas-driven sampler has a complex structure, but has a small diameter and high sampling efficiency, and is suitable for most underground water monitoring wells. The U-shaped gas displacement type sampler developed by Lixiaojie and the like in China is more suitable for sampling underground water of a deep well with a small aperture, however, the sampler is still an intermittent sampler without a water-gas displacement chamber, and when the sampling depth is large, especially when inert gas protects sampling, the gas waste is serious, and the sampling efficiency is low. In addition, the U-shaped gas-driven sampling device is provided with two pipelines, a protective steel wire rope is sometimes required to be additionally arranged, and the three pipelines have higher well blocking risk when being put into a well at the same time. The invention aims to solve the problems of how to reduce the risk of well blockage of a sampling device and improve the sampling efficiency when collecting underground water for a small-aperture hydrological hole with an unstable newly-opened geological structure.
Disclosure of Invention
The invention aims to provide a sleeve type gas-driven underground water sampling device to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the sleeve type gas-driven underground water sampling device comprises a control unit, a transmission unit and a replacement unit, wherein the control unit comprises a high-pressure gas source and a controller, the high-pressure gas source is fixedly connected with the controller through a three-way valve, the transmission unit is formed by nesting an inner pipe and an outer pipe, the two pipes are made of PU materials, and the outer diameter of the whole transmission pipe is smaller than 20 mm; the displacement unit is composed of stainless steel tube material, and the size of the displacement unit is designed as follows: the inner diameter is smaller than 36mm, the outer diameter is smaller than 40mm, the wall thickness is 2-4 mm, the length is smaller than 50cm, one end of the inner pipe is fixedly connected with the upper end of a water outlet pipeline, the lower end of the water outlet pipeline is fixedly connected with a first hollow screw and a second hollow screw in sequence, one end of the outer pipe is fixedly connected with the upper end of an air inlet pipeline, the diameter of the lower end of the air inlet pipeline is enlarged and then fixedly connected with a flange, the second hollow screw is fixedly connected with the center of the flange, the center of the flange is fixedly connected with a check valve, the outer wall of the flange is fixedly connected with the outer wall of a displacer, the check valve is fixedly connected with a stainless steel hollow pipe, the displacer wall of the displacer is fixedly connected with a conical hollow part, the part is fixedly connected with a third hollow screw.
As a further scheme of the invention: the controller is mainly used for controlling the air pressure of the pipeline, the air charging and discharging time and the switch of the relevant air passage and water passage valves.
As a still further scheme of the invention: and 4 holes are formed around the central hole of the flange.
As a further scheme of the invention: the controller is fixedly connected with one side of the outer pipe of the transmission unit through the air inlet pipe.
As a further scheme of the invention: the air inlet pipe is communicated with the outer pipe of the transmission unit.
As a further scheme of the invention: and the sealing ring is provided with a through hole for penetrating through the inner pipe of the transmission unit.
Compared with the prior art, the invention has the beneficial effects that:
1. the transmission unit adopts the nested mode of combining of outer tube and inner tube, and interior outer tube is the PU material, and gaseous input in the middle of outer tube and inner tube during the sample, the water sample flows out from the inner tube, and the sealing washer is adopted to interior outer tube entrance sealed isolation. Whole transmission line is integrated into one, and the external diameter is less than 20mm, and the outer wall is smooth, very big reduction the stuck well risk.
2. The sleeve-type aqueous vapor displacer, it is stainless steel tube material, and the external dimension is: 34mm inside diameter, 40mm outside diameter, 3mm wall thickness, 50cm length. The interior of the displacement chamber is provided with a displacement chamber which has a water storage function, a stainless steel pipe with the outer diameter of 8mm and the inner diameter of 6mm is arranged in the displacement chamber and used for discharging water, the length of the stainless steel pipe extends to the bottom of the displacement chamber and is about 5cm away from the bottom of the displacement chamber, and the aim of the stainless steel pipe is to press all the water stored in the displacement chamber out of the ground as far as possible. The upper end of the steel pipe is provided with a check valve, and the purpose is to prevent the water in the water outlet pipeline from flowing back when the displacement chamber is emptied and filled with water, thereby avoiding the phenomena of low water taking efficiency and serious gas waste. The above design greatly improves the water taking efficiency.
3. The bottom of the replacement chamber is provided with a check valve, which aims to open when the water inlet is emptied to allow the external water to enter the replacement chamber and close when the water outlet is aerated to allow the water in the replacement chamber to flow out from the stainless steel pipe and the water outlet pipeline. The filter is arranged at the bottommost part of the replacement chamber, and the aperture of the filter screen is 2mm, so that particles larger than 2mm are prevented from entering the sampler pipeline to cause the blockage of the equipment pipeline.
Drawings
Fig. 1 is a schematic structural view of a telescopic gas-driven groundwater sampling device.
Fig. 2 is a schematic structural view of a double pipe type water gas displacer of the double pipe type gas driven groundwater sampling device.
Fig. 3 is an exploded view of a double pipe gas displacer for a double pipe gas driven groundwater sampling apparatus.
As shown in the figure: the water-saving type water-gas exchanger comprises a water outlet channel 1, an air inlet channel 2, a first hollow screw 3, a second hollow screw 4, a flange 5, a check valve 6, a stainless steel hollow pipe 7, a displacer outer wall 8, a sleeve type water-gas displacer 9, a conical hollow part 10, a third hollow screw 11, a check valve 12, a filter 13, a control unit 14, a high-pressure gas source 15, a controller 16, a transmission unit 17, a displacer unit 18, an inner pipe 19, an outer pipe 20, a sealing ring 21, an air inlet pipe 22 and a three-way valve 23.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 3, in the embodiment of the present invention, a bushing-type gas-driven groundwater sampling device includes a water outlet pipe 1, a gas inlet pipe 2, a first hollow screw 3, a second hollow screw 4, a flange 5, a check valve 6, a stainless steel hollow pipe 7, a displacer outer wall 8, a bushing-type water-gas displacer 9, a conical hollow part 10, a third hollow screw 11, a check valve 12, a filter 13, a control unit 14, a high-pressure gas source 15, a controller 16, a transmission unit 17, a displacement unit 18, an inner pipe 19, an outer pipe 20, a seal ring 21, a gas inlet pipe 22, and a three-way valve 23, the bushing-type gas-driven groundwater sampling device is composed of three parts, namely, the control unit 14, the transmission unit 17, and the displacement unit 18, and the whole device is driven by high; the control unit 14 is connected with a transmission unit 17, and the transmission unit 17 is connected with a replacement unit 18; the control unit 14 comprises a high-pressure gas source 15 and a controller 16, wherein the controller 16 is mainly used for controlling the air pressure of the pipeline, the air charging and discharging time and the switch of the relevant air passage and water passage valves; the high-pressure gas source 15 is fixedly connected with the controller 16 through a three-way valve 23, the controller 16 is fixedly connected with one side of the outer pipe 20 through an air inlet pipe 22, the transmission unit 17 is formed by nesting a PU inner pipe and a PU outer pipe, and the outer diameter of the whole transmission pipeline is less than 20 mm; the displacement unit 18 mainly comprises a sleeve-type water-gas displacer 9, which is made of stainless steel tube material and has the following dimensions: the inner diameter is less than 36mm, the outer diameter is less than 40mm, the wall thickness is 2-4 mm, and the length is less than 50 cm; the upper part of the displacer 9 is provided with two pipelines, namely an air inlet pipeline 2 and a water outlet pipeline 1, the inside of the water outlet pipeline 1 is connected with a stainless steel pipe with the diameter less than 10mm, the stainless steel pipe extends to the bottom of the displacer chamber and is 5cm away from the bottom, 1 check valve is arranged on the stainless steel pipe, and the bottom is provided with a water inlet; the bottom of the whole replacement unit is provided with a filter 13, the aperture of the filter screen is smaller than 2mm, one end of an inner pipe 19 is fixedly connected with the upper end of a water outlet pipeline 1, the lower end of the inner pipe is fixedly connected with a first hollow screw 3 and a second hollow screw 4 in sequence, one end of an outer pipe 20 is fixedly connected with the upper end of an air inlet pipeline 2, the diameter of the lower end of the air inlet pipeline 2 is enlarged and then fixedly connected with a flange 5, the second hollow screw 4 is fixedly connected with the center of the flange 5, the center of the flange 5 is fixedly connected with a check valve 6, 4 holes are arranged around the center hole of the flange 5, the outer wall of the flange 5 is fixedly connected with an outer wall 8 of a displacer, the check valve 6 is fixedly connected with a stainless steel hollow pipe 7, a displacer wall 9 is fixedly connected with a conical hollow part 10, the part 10 is fixedly connected with a third hollow screw 11, the, the other end of the inner tube 19 penetrates through a sealing ring 21, and a through hole for penetrating through the inner tube 19 is formed in the sealing ring 21.
The water yield of the designed bushing type gas-driven groundwater sampler in a single circulation is calculated according to the formula (1):
in the formula: v0-single cycle water output, L;
rg-outer tube inner radius, 0.007 m;
rw1-inner tube outer radius, 0.005 m;
rw2-inner tube inner radius, 0.004 m;
hglength of the transfer unit below water level, m;
rz-displacement chamber inner diameter, 0.034 m;
hz-displacement chamber height, 0.5 m;
the sampling efficiency of the sampler is calculated according to equation (2)
In the formula: s is the water flow speed of the water outlet pipeline, m/s;
t0-the time, s, required for the water gas displacer to enter.
When the displacement unit is 100m below the water level, the flow rate s of the water outlet pipeline is 1m/s, and the water inlet time t0 of the water-gas displacer is 60s, the maximum water outlet amount of a single circulation of the device is 14.37L, and the maximum sampling efficiency is 149.5L/h.
The working principle of the invention is as follows: the device is conveyed to an underground water sampling site, the aperture of a hydrological hole on the site is 90cm, the water level is 100m, the well depth is 300m, the air compressor 15 is connected with the controller 16, the gas outlet of the controller 16 is connected with the gas inlet of the transmission unit 17, the inner pipe 19 and the outer pipe 20 of the transmission unit 17 are isolated by the sealing ring 21, and the outer pipe 20 and the inner pipe 19 of the transmission unit 17 are respectively connected with the gas inlet pipeline 2 and the water outlet pipeline 1. And slowly putting the displacement unit 18 and the transmission unit 17 into the well integrally, stopping putting the displacement unit 18 when the water level is 100m, fixing the displacement unit at the well mouth, setting the pressure of the gas inlet end of the controller 16 to be 2MPa, and setting relevant parameters such as the gas charging and discharging time of the control unit 14. After the replacement unit 18 is stabilized at the predetermined position for 5min, the transfer line and the replacement chamber below the water level are filled with water. The control unit 14 is started to be switched on and switched off, the air inlet starts to be inflated, the check valve 6 is opened along with the gradual rise of the pressure in the air inlet channel 2, the check valve 12 is closed, and when the air pressure in the air inlet channel 2 reaches 2MPa, the inner pipe 19 starts to discharge water. When all water samples in the replacement chamber are discharged, the controller controls the air inlet to be emptied and communicated with the atmosphere, the check valve 6 is closed, the check valve 12 is opened, the replacement chamber begins to empty and feed water, and when the replacement chamber and the underwater transmission pipeline are filled with water, the air inlet begins to charge air, and the steps are repeated in such a way, so that the efficient sampling of the underground water with the small aperture diameter and the deep water level on site is realized.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (6)
1. A telescopic gas-driven groundwater sampling device comprising a control unit (14), a transmission unit (17) and a displacement unit (18), characterized in that: the control unit (14) comprises a high-pressure gas source (15) and a controller (16), the high-pressure gas source (15) is fixedly connected with the controller (16) through a three-way valve (23), the transmission unit (17) is formed by nesting an inner pipe (19) and an outer pipe (20), the two pipes are made of PU materials, the outer wall of the two pipes is smooth, and the outer diameter of the whole transmission pipeline is less than 20 mm; the displacement unit (18) is composed of stainless steel tubing material and is dimensioned: the inner diameter is less than 36mm, the outer diameter is less than 40mm, the wall thickness is 2-4 mm, the length is less than 50cm, the aperture of a bottom filter screen is less than 2mm, one end of an inner pipe (19) is fixedly connected with the upper end of a water outlet channel (1), the lower end of the water outlet channel (1) is fixedly connected with a first hollow screw (3) and a second hollow screw (4) in sequence, one end of an outer pipe (20) is fixedly connected with the upper end of an air inlet channel (2), the diameter of the lower end of the air inlet channel (2) is enlarged and then fixedly connected with a flange (5), the second hollow screw (4) is fixedly connected with the center of the flange (5), the center of the flange (5) is fixedly connected with a check valve (6), the outer wall of the flange (5) is fixedly connected with a displacer outer wall (8), the check valve (6) is fixedly connected with a stainless steel hollow pipe (7), a displacer wall (9) is fixedly connected with a conical hollow part (, the hollow screw (11) is fixedly connected with the check valve (12), the check valve (12) is fixedly connected with the filter (13), the other end of the outer pipe (20) is fixedly connected with a sealing ring (21), and the other end of the inner pipe (19) penetrates through the sealing ring (21).
2. The telescopic gas driven groundwater sampling device according to claim 1, wherein: the inner pipe of the transmission unit is nested in the outer pipe.
3. The telescopic gas driven groundwater sampling device according to claim 1, wherein: 4 holes are formed around the central hole of the flange (5).
4. The telescopic gas driven groundwater sampling device according to claim 1, wherein: the controller (16) is fixedly connected with one side of the outer pipe (20) through an air inlet pipe (22).
5. The telescopic gas driven groundwater sampling device according to claim 1, wherein: the air inlet pipe (22) is communicated with the outer pipe (20).
6. The telescopic gas driven groundwater sampling device according to claim (1), wherein: and a through hole for the inner pipe (19) to penetrate through is formed in the sealing ring (21).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113804508A (en) * | 2021-07-27 | 2021-12-17 | 湖南新九方科技有限公司 | Undisturbed automatic layering sampling device and method for underground water |
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