CN112924232B - Four-channel gas-driven type underground water continuous sampling device - Google Patents
Four-channel gas-driven type underground water continuous sampling device Download PDFInfo
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- CN112924232B CN112924232B CN202110248551.XA CN202110248551A CN112924232B CN 112924232 B CN112924232 B CN 112924232B CN 202110248551 A CN202110248551 A CN 202110248551A CN 112924232 B CN112924232 B CN 112924232B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 176
- 238000005070 sampling Methods 0.000 title claims abstract description 48
- 238000006073 displacement reaction Methods 0.000 claims abstract description 42
- 230000005540 biological transmission Effects 0.000 claims abstract description 22
- 239000007789 gas Substances 0.000 claims description 108
- 229910001220 stainless steel Inorganic materials 0.000 claims description 45
- 239000010935 stainless steel Substances 0.000 claims description 45
- 230000001681 protective effect Effects 0.000 claims description 11
- 239000003673 groundwater Substances 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 5
- 239000002699 waste material Substances 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 3
- 238000005273 aeration Methods 0.000 claims 1
- 229910001873 dinitrogen Inorganic materials 0.000 claims 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims 1
- 239000011148 porous material Substances 0.000 claims 1
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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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
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Abstract
The invention discloses a four-channel gas-driven type underground water continuous sampling device which comprises a control unit, a transmission unit, a displacement unit, a four-channel water-gas displacer, a first displacement chamber, a second displacement chamber, a first check valve, a second check valve, a third check valve, a fourth check valve and a filter The gas is wasted seriously.
Description
Technical Field
The invention relates to the research device and technical field in the field of environmental science, in particular to a four-channel gas-driven underground water continuous 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 divided into four 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 four-channel gas-driven type underground water continuous sampling device to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the four-channel gas-driven type underground water continuous 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, a gas outlet of the high-pressure gas source is fixedly connected with one end of a first three-way valve, the other two ends of the first three-way valve are fixedly connected with a gas inlet of the controller, the controller is used for program control of opening and closing time and duration of the gas inlet channel and the water outlet channel, the pressure of high-pressure nitrogen is set according to the sampling depth, a gas outlet of the controller is fixedly connected with a first gas inlet, the other end of the first gas inlet is fixedly connected with one end of a second three-way valve, the other two ends of the second three-way valve are connected with the transmission unit, the transmission unit is composed of four PU pipes with the size of 8mm multiplied by 5mm, and the four PU pipes are respectively a first gas inlet pipe, a second gas inlet pipe, a first water outlet pipe and a second water outlet pipe, the first air inlet pipe and the second air inlet pipe transmit gas, the first water outlet pipe and the second water outlet pipe transmit water samples, the outer sides of the first air inlet pipe, the second air inlet pipe, the first water outlet pipe and the second water outlet pipe are provided with pipeline protective sleeves, the outer walls of the pipeline protective sleeves are smoothly arranged, the well blocking risk is greatly reduced, one ends of the first air inlet pipe and the second air inlet pipe are fixedly connected with the other two ends of the second three-way valve, the other ends of the first air inlet pipe and the second air inlet pipe are connected with a replacement unit, the replacement unit and the transmission unit both extend into a hydrological hole well, the replacement unit is lower than a water level line, the replacement unit is a four-channel water-gas replacer, the top of the four-channel water-gas replacer is provided with a second air inlet and a third air inlet, the second air inlet is fixedly connected with the first air inlet pipe, and the third air inlet is fixedly connected with the second air inlet pipe, the top of the four-channel water-gas displacer is provided with a second water outlet and a third water outlet, one end of the second water outlet is fixedly connected with a first water outlet pipe, the third water outlet is fixedly connected with a second water outlet pipe, the other end of the first water outlet pipe and the other end of the second water outlet pipe are fixedly connected with two ends of a third three-way valve, the other end of the third three-way valve is fixedly connected with the first water outlet, the other end of the second water outlet is fixedly connected with one end of a first stainless steel pipe, the other end of the third water outlet is fixedly connected with one end of a second stainless steel pipe, the inside of the four-channel water-gas displacer is separated into a first displacement chamber and a second displacement chamber by a separation baffle, both displacement chambers have water storage functions, the single-cycle water output is greatly increased, the first stainless steel pipe is arranged in the first displacement chamber, the second stainless steel pipe is arranged in the second displacement chamber, the length of the other ends of the first stainless steel pipe and the second stainless steel pipe extends to a position which is about 5cm away from the bottom of the first replacement chamber and the bottom of the second replacement chamber, the purpose is to press all water stored in the first replacement chamber and the second replacement chamber out of the ground as far as possible, the other ends of the first stainless steel pipe and the second stainless steel pipe are provided with a first check valve and a second check valve, the purpose is to prevent the phenomena of low water taking efficiency and serious gas waste caused by water backflow in a water outlet pipeline when the first replacement chamber and the second replacement chamber are emptied and filled, the bottom of the first replacement chamber and the bottom of the second replacement chamber are provided with a third check valve and a fourth check valve corresponding to the first check valve and the second check valve, the purpose is to open the first replacement chamber and the second replacement chamber when the water is emptied and filled and the water is closed, so that the water in the first replacement chamber and the second replacement chamber flows out of the first stainless steel pipe and the second stainless steel pipe along the first water outlet The water port flows out, and the bottom of the first replacement chamber and the second replacement chamber are provided with filters.
As a further scheme of the invention: the control unit is arranged on the ground surface, and the high-pressure gas source is an air compressor or a high-pressure gas source.
As a still further scheme of the invention: the first air inlet pipe and the second air inlet pipe transmit air, the first water outlet pipe and the second water outlet pipe transmit water, and the diameters of the first air inlet pipe, the second air inlet pipe, the first water outlet pipe and the second water outlet pipe are all smaller than 10 millimeters.
As a still further scheme of the invention: the four-channel water-gas displacer is made of stainless steel tubes, and has the external dimensions of 34mm in inner diameter, 40mm in outer diameter, 3mm in wall thickness and 50cm in length.
As a still further scheme of the invention: the first replacement chamber and the second replacement chamber both have a water storage function, the single-cycle water yield is greatly increased, and the first stainless steel pipe and the second stainless steel pipe are 8mm in outer diameter and 6mm in inner diameter.
As a still further scheme of the invention: the aperture of the filter screen of the filter is 2mm, and the purpose is to prevent particles larger than 2mm from entering the sampler pipeline to cause the blockage of the equipment pipeline.
Compared with the prior art, the invention has the beneficial effects that:
1. by arranging the controller, personnel can conveniently control the opening and closing time and duration of the air inlet channel and the water outlet channel, the pressure of high-pressure nitrogen is set according to the sampling depth, the outer walls of the protective sleeves of the four transmission pipelines are smoothly arranged, the outer diameter of the whole transmission pipeline is smaller than 20mm, and the risk of well blockage is greatly reduced;
2. the first replacement chamber and the second replacement chamber with the water storage function are arranged to work circularly, so that continuous water taking is realized, the sampling efficiency is greatly improved, and the phenomena of low water taking efficiency and serious gas waste caused by water backflow in a water outlet pipeline when the first replacement chamber and the second replacement chamber are emptied and fed with water are avoided by arranging the first check valve, the second check valve, the third check valve and the fourth check valve;
3. by providing a filter, the aim is to prevent particles larger than 2mm from entering the sampling device line and causing the line of the device to be blocked.
Drawings
FIG. 1 is a schematic structural view of a four-channel gas-driven groundwater continuous sampling device.
Fig. 2 is a schematic structural diagram of the four-channel water gas displacer 11.
Shown in the figure: the device comprises a control unit 1, a transmission unit 2, a replacement unit 3, a high-pressure gas source 4, a first three-way valve 5, a controller 6, a first air inlet 7, a second three-way valve 8, a first air inlet pipe 9, a second air inlet pipe 10, a four-channel water gas replacer 11, a first water outlet pipe 12, a second water outlet pipe 13, a third three-way valve 14, a first water outlet 15, a pipeline protective sleeve 16, a hydrological hole well 17, a water level line 18, a second water outlet 19, a first stainless steel pipe 20, a third water outlet 21, a second stainless steel pipe 22, a second air inlet 23, a third air inlet 24, a separation baffle 25, a first replacement chamber 26, a second replacement chamber 27, a first check valve 28, a second check valve 29, a third check valve 30, a fourth check valve 31 and a filter 32.
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. 1-2, in an embodiment of the present invention, a four-channel gas-driven continuous groundwater sampling device includes a control unit 1, a transmission unit 2, a displacement unit 3, a high-pressure gas source 4, a first three-way valve 5, a controller 6, a first gas inlet 7, a second three-way valve 8, a first gas inlet pipe 9, a second gas inlet pipe 10, a four-channel gas displacer 11, a first water outlet pipe 12, a second water outlet pipe 13, a third three-way valve 14, a first water outlet 15, a pipeline protection sleeve 16, a hydrological bore well 17, a water level line 18, a second water outlet 19, a first stainless steel pipe 20, a third water outlet 21, a second stainless steel pipe 22, a second gas inlet 23, a third gas inlet 24, a partition plate 25, a first displacement chamber 26, a second displacement chamber 27, a first check valve 28, a second check valve 29, a third check valve 30, a fourth check valve 31, and a filter 32, where the control unit 1 is disposed on the ground surface, mainly including high-pressure gas source 4 and controller 6, high-pressure gas source 4 is an air compressor or a high-pressure gas bottle, the gas outlet of high-pressure gas source 4 is fixedly connected with one end of a first three-way valve 5, the other two ends of first three-way valve 5 are fixedly connected with the gas inlet of controller 6, controller 6 is mainly used for program control of the opening and closing time and duration of the gas inlet channel and the water outlet channel, and the pressure of high-pressure nitrogen is set according to the sampling depth, the gas outlet of controller 6 is fixedly connected with a first gas inlet 7, the other end of first gas inlet 7 is fixedly connected with one end of a second three-way valve 8, the other two ends of second three-way valve 8 are connected with transmission unit 2, transmission unit 2 is composed of four PU pipes 8mm 5mm, the four PU pipes are respectively a first gas inlet pipe 9, a second gas inlet pipe 10, a first water outlet pipe 12 and a second water outlet pipe 13, the gas-water separator comprises a first gas inlet pipe 9, a second gas inlet pipe 10, a first water outlet pipe 12, a second water outlet pipe 13, a pipeline protective sleeve 16, a displacement unit 3 and a transmission unit, wherein the first gas inlet pipe 9 and the second gas inlet pipe 10 transmit gas, the first water outlet pipe 12 and the second water outlet pipe 13 transmit water, the diameters of the first gas inlet pipe 9, the second gas inlet pipe 10, the first water outlet pipe 12 and the second water outlet pipe 13 are all smaller than 10 mm, the outer side of the pipeline protective sleeve 16 is fixedly sleeved with the pipeline protective sleeve 16, the risk of well blockage is greatly reduced, one end of the first gas inlet pipe 9 and the second gas inlet pipe 10 is fixedly connected with the other two ends of a second three-way valve 8, the other ends of the first gas inlet pipe 9 and the second gas inlet pipe 10 are connected with the displacement unit 3, the displacement unit 3 and the transmission unit both extend into a hydrological hole well 17, the displacement unit 3 is lower than a water level line 18, the displacement unit 3 is mainly a four-channel water gas displacer 11, the four-channel water-gas displacer 11 is made of stainless steel pipes, the external dimension of the four-channel water-gas displacer 11 is 34mm in internal diameter, 40mm in external diameter, 3mm in wall thickness and 50cm in length, a second air inlet 23 and a third air inlet 24 are arranged at the top of the four-channel water-gas displacer 11, the second air inlet 23 is fixedly connected with a first air inlet pipe 9, the third air inlet 24 is fixedly connected with a second air inlet pipe 10, a second water outlet 19 and a third water outlet 21 are arranged at the top of the four-channel water-gas displacer 11, one end of the second water outlet 19 is fixedly connected with a first water outlet pipe 12, the third water outlet 21 is fixedly connected with a second water outlet pipe 13, the other ends of the first water outlet pipe 12 and the second water outlet pipe 13 are fixedly connected with two ends of a third three-way valve 14, the other end of the third three-way valve 14 is fixedly connected with a first water outlet 15, and the other end of the second water outlet 19 is fixedly connected with one end of a first stainless steel pipe 20, the other end of the third water outlet 21 is fixedly connected with one end of a second stainless steel pipe 22, the inside of the four-channel steam displacer 11 is separated into a first displacement chamber 26 and a second displacement chamber 27 by a partition baffle 25, the first stainless steel pipe 20 is arranged in the first displacement chamber 26, the second stainless steel pipe 22 is arranged in the second displacement chamber 27, the first displacement chamber 26 and the second displacement chamber 27 both have a water storage function, and the single-cycle water output is greatly increased, the sizes of the first stainless steel pipe 20 and the second stainless steel pipe 22 are 8mm in outer diameter and 6mm in inner diameter, the lengths of the other ends of the first stainless steel pipe 20 and the second stainless steel pipe 22 extend to a position about 5cm away from the bottom of the first displacement chamber 26 and the bottom of the second displacement chamber 27, so that the water stored in the first displacement chamber 26 and the second displacement chamber 27 can be completely pressed out of the ground as far as possible, and the other ends of the first stainless steel pipe 20 and the second stainless steel pipe 22 are provided with a first check valve 28 and a second check valve A valve 29 for preventing the water in the outlet pipe from flowing back when the first and second replacement chambers 26 and 27 are emptied of water, thereby preventing the water from being taken out efficiently and the gas from being wasted, the bottom of the first replacement chamber 26 and the bottom of the second replacement chamber 27 are installed with a third check valve 30 and a fourth check valve 31 corresponding to the first check valve 28 and the second check valve 29, its purpose is that the first displacement chamber 26 and the second displacement chamber 27 open to let the external water enter the four-channel water gas displacer 11 when the incoming water is being emptied, when the water is aerated and discharged, the water in the first displacement chamber 26 and the second displacement chamber 27 is closed to flow out from the first stainless steel pipe 20 and the second stainless steel pipe 22 along the first water outlet 15, the bottom parts of the first displacement chamber 26 and the second displacement chamber 27 are provided with filters 32, the filter mesh diameter of each filter 32 is 2mm, the purpose is to prevent particles larger than 2mm from entering the pipeline of the sampling device to cause the blockage of the pipeline of the device.
Estimation of sampling efficiency:
the water yield of a single circulation of the designed four-channel gas driven type underground water continuous sampler is calculated according to the formula (1):
in the formula: v0-single cycle water output, L;
rg-transport pipe internal diameter, 0.005 m;
hg-length of the transport pipe below water level, m;
ng-number of transport pipes, 4;
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: epsilon-water intake efficiency, L/h;
s is the flow velocity of the water outlet pipeline, m/s.
When the displacement unit is 100m below the water level and the flow rate of the water outlet pipeline is 1m/s, the maximum water outlet amount of a single circulation of the device is 8.3L, and the maximum sampling efficiency is 282.6L/h.
The working principle of the invention is as follows:
when the four-channel gas-driven type underground water continuous sampling device needs to be used, a person conveys the device to a hydrological hole well 17 of an underground water sampling site, the aperture of the hydrological hole well 17 is 90cm, the water level is 100m, the well depth is 300m, a high-pressure gas source 4 is connected with a controller 6, the controller 6 is connected with a second three-way valve 8 of two gas inlets of a transmission unit 2, a first gas inlet pipe 9, a second gas inlet pipe 10, a first water outlet pipe 12 and a second water outlet pipe 13 of the transmission unit 2 are connected with a second water outlet 19, a third water outlet 21, a second gas inlet 23 and a third gas inlet 24 which correspond to a displacement unit 3, the displacement unit 3 and the transmission unit 2 are integrally and slowly put into the hydrological hole well 17, the displacement unit 3 stops putting down when being 100m below a water level line 18 and is fixed at the wellhead of the hydrological hole well 17, the pressure of a gas inlet end is set to be 2MPa, the gas charging and discharging time related parameters of the control unit 1 are set, after the replacement unit 3 is stabilized at the preset position for five minutes, the first water outlet pipe 12, the second water outlet pipe 13, the first stainless steel pipe 20, the second stainless steel pipe 22, the first replacement chamber 26 and the second replacement chamber 27 below the water level are filled with water, the control unit 1 is started, the second air inlet 23 starts to be inflated, at the moment, the third air inlet 24 is communicated with the atmosphere, the first check valve 28 is opened, the second check valve 29 is closed, when the air pressure in the first air inlet pipe 9 reaches 2MPa, the first replacement chamber 26 starts to be inflated and discharged with water samples flowing out from the second water outlet 19, when all the water samples in the first replacement chamber 26 are discharged, the third air inlet 24 starts to be inflated, at the moment, the third air inlet 24 is communicated with the atmosphere, the first check valve 28 is closed, the second check valve 29 is opened, the third check valve 30 is opened, the fourth check valve 31 is closed, the first replacement chamber 26 starts to be emptied with water, when the air pressure in the third air inlet 24 reaches 2MPa, the second replacement chamber 27 starts to be inflated to discharge water, water samples flow out of the third water outlet 21, and the continuous sampling of the underground water with small aperture and deep water level on site is realized by the reciprocating circulation, the controller 6 is arranged to facilitate personnel to control the opening and closing time and duration of the air inlet channel and the water outlet channel, the pressure of high-pressure nitrogen is set according to the sampling depth, the outer wall of the pipeline protective sleeve 16 is set to be smooth, the well blocking risk is greatly reduced, the phenomena of low water taking efficiency and serious gas waste caused by water backflow in the water outlet pipeline when the first replacement chamber 26 and the second replacement chamber 27 empty the water inlet are avoided by arranging the first check valve 28, the second check valve 29, the third check valve 30 and the fourth check valve 31, and the filter 32 is arranged to prevent particles larger than 2mm from entering the sampler pipeline to cause the blockage of the equipment pipeline.
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. Four passageway gas drive formula groundwater continuous sampling device, including control unit (1), transmission unit (2) and replacement unit (3), its characterized in that: control unit (1) includes high-pressure gas source (4) and controller (6), high-pressure gas source (4) gas outlet and first three-way valve (5) one end fixed connection, first three-way valve (5) both ends and controller (6) air inlet fixed connection in addition, controller (6) are used for opening of program control inlet channel and outlet channel, the time and the duration of closing to set for the pressure of high-pressure nitrogen gas according to the sampling depth, controller (6) gas outlet and first air inlet (7) fixed connection, first air inlet (7) other end and second three-way valve (8) one end fixed connection, second three-way valve (8) both ends in addition are connected with transmission unit (2), transmission unit (2) comprise four 8mm 5 mm's PU pipe, and four PU pipes are first intake pipe (9), second intake pipe (10) respectively, First outlet pipe (12) and second outlet pipe (13), first intake pipe (9) and second intake pipe (10) transmission gas, the outside of first intake pipe (9), second intake pipe (10), first outlet pipe (12) and second outlet pipe (13) is provided with pipeline protective sheath (16), pipeline protective sheath (16) outer wall is smooth setting, very big reduction the stuck well risk, first intake pipe (9) and second intake pipe (10) one end and second three-way valve (8) both ends fixed connection in addition, first intake pipe (9) and second intake pipe (10) other end are connected with replacement unit (3), replacement unit (3) all stretch into hydrological hole well (17) with transmission unit, replacement unit (3) are less than water-water line (18), replacement unit (3) are four-channel displacer (11), the top of the four-channel water gas displacer (11) is provided with a second air inlet (23) and a third air inlet (24), the second air inlet (23) is fixedly connected with a first air inlet pipe (9), the third air inlet (24) is fixedly connected with a second air inlet pipe (10), the top of the four-channel water gas displacer (11) is provided with a second water outlet (19) and a third water outlet (21), one end of the second water outlet (19) is fixedly connected with a first water outlet pipe (12), the third water outlet (21) is fixedly connected with a second water outlet pipe (13), the other ends of the first water outlet pipe (12) and the second water outlet pipe (13) are fixedly connected with two ends of a third three-way valve (14), the other end of the third three-way valve (14) is fixedly connected with a first water outlet (15), and the other end of the second water outlet (19) is fixedly connected with one end of a first stainless steel pipe (20), the other end of the third water outlet (21) is fixedly connected with one end of a second stainless steel pipe (22), a first replacement chamber (26) and a second replacement chamber (27) are isolated from the interior of the four-channel water-gas displacer (11) through a separation baffle plate (25), the first stainless steel pipe (20) is arranged in the first replacement chamber (26), the second stainless steel pipe (22) is arranged in the second replacement chamber (27), the lengths of the other ends of the first stainless steel pipe (20) and the second stainless steel pipe (22) extend to a position which is about 5cm away from the bottom of the first replacement chamber (26) and the bottom of the second replacement chamber (27), the purpose is to press all water stored in the first replacement chamber (26) and the second replacement chamber (27) out of the ground as far as possible, and a first check valve (28) and a second check valve (29) are arranged at the other end of the first stainless steel pipe (20) and the other end of the second stainless steel pipe (22), the purpose is to prevent the phenomena of low water taking efficiency and serious gas waste caused by the backflow of water in the water outlet pipeline when the first replacement chamber (26) and the second replacement chamber (27) are emptied into water, the bottom of the first replacement chamber (26) and the bottom of the second replacement chamber (27) are provided with a third check valve (30) and a fourth check valve (31) corresponding to the first check valve (28) and the second check valve (29), the purpose is that the first displacement chamber (26) and the second displacement chamber (27) are opened when the inlet water is emptied to let the external water enter the four-channel water gas displacer (11), when the water is discharged by aeration, the water in the first replacement chamber (26) and the second replacement chamber (27) is closed to flow out from the first stainless steel pipe (20) and the second stainless steel pipe (22) along the first water outlet (15), and filters (32) are arranged at the bottoms of the first replacement chamber (26) and the second replacement chamber (27).
2. The four-channel gas-driven continuous groundwater sampling apparatus according to claim 1, wherein: the control unit (1) is arranged on the ground surface, and the high-pressure gas source (4) is an air compressor or a high-pressure gas bottle.
3. The four-channel gas-driven continuous groundwater sampling apparatus according to claim 1, wherein: the gas transmission device is characterized in that the first gas inlet pipe (9) and the second gas inlet pipe (10) transmit gas, the first water outlet pipe (12) and the second water outlet pipe (13) transmit water, and the diameters of the first gas inlet pipe (9), the second gas inlet pipe (10), the first water outlet pipe (12) and the second water outlet pipe (13) are all smaller than ten millimeters.
4. The four-channel gas-driven continuous groundwater sampling apparatus according to claim 1, wherein: the four-channel water gas displacer (11) is made of stainless steel pipes and has the following external dimensions: 34mm inside diameter, 40mm outside diameter, 3mm wall thickness, 50cm length.
5. The four-channel gas-driven continuous groundwater sampling apparatus according to claim 1, wherein: the first replacement chamber (26) and the second replacement chamber (27) have a water storage function, and the first stainless steel pipe (20) and the second stainless steel pipe (22) have the sizes of 8mm of outer diameter and 6mm of inner diameter.
6. The four-channel gas-driven continuous groundwater sampling apparatus according to claim 1, wherein: the filter (32) has a filter mesh pore size of 2mm, and aims to prevent particles larger than 2mm from entering the sampling device pipeline to cause the blockage of the equipment pipeline.
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|---|---|---|---|---|
| US5611671A (en) * | 1996-04-26 | 1997-03-18 | Tripp, Jr.; Ralph N. | Pumping system for groundwater sampling |
| CN101718640B (en) * | 2009-12-11 | 2012-04-18 | 西北核技术研究所 | Split type gas displacement type underground water sampler |
| CN102749223B (en) * | 2012-07-20 | 2014-11-05 | 中国地质调查局水文地质环境地质调查中心 | Pneumatic pump sampling system device of multi-stage monitoring well and method thereof |
| CN203798628U (en) * | 2014-04-16 | 2014-08-27 | 中国地质调查局水文地质环境地质调查中心 | U-shaped pipe sampler underground pipeline connecting device |
| CN205958301U (en) * | 2016-08-15 | 2017-02-15 | 中国冶金地质总局山东正元地质勘查院 | Groundwater sample thief is used to hydrogeology |
| CN106153395B (en) * | 2016-09-21 | 2018-05-18 | 中国地质大学（北京） | A kind of underground water integrates sampling apparatus |
| CN210051587U (en) * | 2019-04-10 | 2020-02-11 | 中国地质调查局水文地质环境地质调查中心 | Pneumatic underground water stratified sampling device |
| CN210108786U (en) * | 2019-05-30 | 2020-02-21 | 锦州华冠环境科技实业股份有限公司 | Water sampling all-in-one machine capable of providing circulating water sample |
| CN111537282A (en) * | 2020-05-29 | 2020-08-14 | 中国地质调查局武汉地质调查中心(中南地质科技创新中心) | Groundwater single tube pulse stratified sampling device based on gas drive principle |
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