CN110907226B - Near liquid level ultra-deep sampling device and using method thereof - Google Patents
Near liquid level ultra-deep sampling device and using method thereof Download PDFInfo
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- CN110907226B CN110907226B CN201911009617.9A CN201911009617A CN110907226B CN 110907226 B CN110907226 B CN 110907226B CN 201911009617 A CN201911009617 A CN 201911009617A CN 110907226 B CN110907226 B CN 110907226B
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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
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
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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 provides an adjacent liquid level ultra-deep sampling device and a using method thereof. The liquid level near ultra-deep sampling device comprises a submersible pump, a water outlet pipe, a drainage body, a drainage cover and a water inlet pipe. The submersible pump is a vertical submersible pump with a water inlet arranged on the side wall; the water outlet pipe is used for conveying water pumped by the submersible pump to the water sample collecting device; the drainage body is arranged at the lower end of the submersible pump and used for enabling the water flow entering the device to change smoothly; the drainage cover is a barrel body with an opening at the upper end and a conical bottom with a downward conical top sealed at the lower end, the lower end of the submersible pump provided with the drainage body is sleeved on the submersible pump in a penetrating way, and the upper end port of the drainage cover is sealed with the outer wall of the upper end of the water inlet of the submersible pump to form an annular cavity; the inlet tube is installed on the small-diameter section of the lower end of the drainage cover. The invention has simple structure, convenient operation and lower manufacturing cost, the water sampling depth is not limited by the performance of pumping equipment such as a pump body and the like and the water pressure, and the fidelity of the collected water sample is better.
Description
Technical Field
The invention relates to a sampling device for ultra-deep well water, in particular to an adjacent liquid level ultra-deep sampling device and a using method thereof.
Background
At present, the monitoring method of the groundwater environment mainly adopts the modes of on-line monitoring, sampling detection and the like. The general on-line monitoring items comprise water level, water temperature, conductivity, pH value and the like, the monitoring items are limited by the performance of an on-line monitoring instrument, the depth of a monitoring point is also limited, and particularly, the monitoring point cannot be used for monitoring a large depth under the liquid level; the comprehensive monitoring of the environmental quality of underground water mainly depends on a sampling detection method. In the sampling monitoring process, the degree of coincidence between the detection result of the collected sample and the actual situation often depends on two main factors, namely the fidelity of the collected sample and the detection means. And the collection of the water sample with high fidelity is the basis for accurately judging the water environment quality.
The conventional underground water sample collection methods are more, such as a bucket, a pump or other various depth-setting sampling methods. The pail sampling method has the characteristics of directness, simplicity and convenience, but can only collect water samples in a limited depth range above and below the water surface. The sampling mode has more factors influencing the quality of the sample, the sample is greatly disturbed, the sample is easily cross-contaminated, and the nature or the state of an unstable substance in the water sample is easily changed, so that the sample has lower fidelity.
Pumping sampling methods are widely used, and usually include a first mode of lowering a submersible pump into a filter located at the lower part of a well pipe and a second mode of installing the submersible pump below the dynamic water level in the well. Because the well pipe filter corresponds to the position of the underground aquifer, only the water sample at the position of the well pipe filter is collected, and the detection data capable of reflecting the real condition of the underground water can be obtained. However, the submersible pump is limited by the pumping capacity of the submersible pump, so that the following main problems exist: the sampling depth of the first pumping sampling mode cannot be too deep, and if the depth of the well pipe filter part exceeds the maximum lift of the submersible pump, the pumping sampling method is not suitable for being adopted; the second pumping sampling method is that in the sampling process, in order to collect water samples with high fidelity as much as possible, all the water stored in the well pipe needs to be pumped out and discharged, namely, the residual water produced by the pumping sampling method is large, so that the waste of water resources is caused; for the polluted water well, the discharged excessive water can cause secondary pollution to the environment; moreover, the extraction of excessive residual water also consumes more electric energy.
Although other depth-fixed sampling methods can collect water samples within a certain depth range, the depth of collecting samples is also greatly limited due to the pressure resistance of a container filled with samples and a sampling system.
Disclosure of Invention
The invention aims to provide an adjacent liquid level ultra-deep sampling device and a using method thereof, and solves the problems that the existing sampling equipment is difficult to collect samples in ultra-deep wells and the collected water samples are easy to distort.
The invention is realized by the following steps: an ultra-deep adjacent liquid level sampling device comprising:
the submersible pump is a cylindrical pump body, a water outlet pipe used for guiding the water to the ground is connected to a water outlet at the top of the submersible pump, scale marks representing the length of the water outlet pipe are marked on the pipe wall of the water outlet pipe, and one end of the starting point of the scale marks of the water outlet pipe of the marking column is connected to the water outlet of the submersible pump;
the upper part of the fluid guide is a cylindrical pipe body with the same diameter as the submersible pump, the lower part of the fluid guide is a cone with the downward top, and the fluid guide is arranged at the lower end of the submersible pump and used for reducing disturbance to pumped liquid;
the drainage cover is a cover body which covers the periphery of the submersible pump and the drainage fluid, the cover body comprises a large-diameter section positioned at the upper part, a small-diameter section positioned at the lower part and a reducing section for connecting the large-diameter section and the small-diameter section, the upper end opening of the large-diameter section is sealed on a pump body at the upper part of a water inlet annular opening of the submersible pump, the reducing section corresponds to a lower cone of the drainage fluid, the taper of the reducing section is consistent with that of the lower cone of the drainage fluid, the diameter of the small-diameter section is larger than that of the water outlet pipe, and the sectional area of an annular cavity formed between the large-diameter section and the reducing section and the drainage fluid is not larger than that of the small-diameter section;
the upper end of the water inlet pipe is connected to the thin pipe section of the drainage cover, and the lower end of the water inlet pipe is connected with the flower net pipe drop; and
the mesh pipe drop is arranged at a filter at the lower part of the deep well and used for collecting underground water and providing pull-down gravity for keeping a water inlet pipe in a straight state; the structure is that the bottom of a section of straight-wall lattice net pipe is connected with a conical bottom plate, the top of the straight-wall lattice net pipe is connected with an annular top plate, and the inner circle of the annular top plate is connected with a connector which is used for connecting the water inlet pipe.
The central lines of the upper cylindrical pipe body and the lower cone of the fluid guide body and the central line of the submersible pump are on the same straight line.
The central lines of the large-diameter section, the small-diameter section and the variable-diameter section on the drainage cover are on the same straight line, and the central line of the drainage cover coincides with the central line of the submersible pump after the drainage cover is installed.
The ratio of the diameter of the bottom circle of the cone at the lower end of the drainage body to the height of the cone is 1/2-1/3.
According to the invention, the lower end of the submersible pump is provided with the drainage body, and the drainage cover is sleeved on the peripheries of the drainage body and the submersible pump, so that the pumped water body enters the submersible pump through the conical-bottom annular cavity formed between the drainage cover and the drainage body after entering from the drainage cover, and the disturbance of the bottom plane of the pump to the water body can be reduced to the maximum extent; meanwhile, by means of the distribution mode that the sectional area of the inner cavity is gradually reduced from the water inlet pipe and the drainage cavity to the water outlet pipe, the water flow in the liquid level approaching ultra-deep sampling device is sufficient, instantaneous change of the water pressure of the water body in the device is avoided, and precipitation of volatile substances contained in the water body is greatly reduced. The cooperative matching of the measures enables the fidelity of the collected water sample to be obviously improved. And, because the immersible pump only needs to set up under the liquid level, through the inlet tube of sub-unit connection and flower net pipe weight, has prolonged the water inlet of immersible pump downwards equivalently, and the immersible pump only needs to set up the position that closes on the liquid level below the liquid level, just so in fact has eliminated the lift restriction of immersible pump to can suck the water of arbitrary degree of depth, realize the extra-deep sampling. The key to the present invention is this.
The invention can also be realized as follows: the use method of the critical liquid level ultra-deep sampling device comprises the following steps:
a. measuring the distance between the surface of the well water in the water well to be sampled and the well mouth, and determining the throwing depth of the submersible pump in the water well to be sampled according to the distance so as to enable the water outlet of the submersible pump to be submerged below the surface of the well water after throwing;
b. respectively calculating the distance between a filter at the lower part of a well pipe and the well water liquid level and the configuration length of a required water outlet pipe according to well pipe structure data of a well to be sampled and measured distance data between the well water liquid level and a well mouth, and intercepting the water inlet pipe with the corresponding length according to the calculation result;
c. one end of the intercepted water inlet pipe is fixedly connected to the lower port of the drainage cover, and the other end of the intercepted water inlet pipe is fixedly connected to the interface of the flower net pipe pendant;
d. a flower net pipe drop, a water inlet pipe, a submersible pump, a drainage cover and a water outlet pipe which are connected in sequence are put down in a water well to be sampled; according to the size marked on the pipe wall of the water outlet pipe, after the submersible pump which is lowered is determined to be completely submerged in the water level of the well, the lowering operation is stopped, at the moment, the water inlet pipe is straightened in the well pipe by the flower net pipe weight, and the flower net pipe weight is just suspended at the position to be sampled in the well pipe;
e. the total internal volumes of the water inlet pipe, the submersible pump, the drainage cover and the water outlet pipe which are transferred are calculated, the submersible pump is started, the initially collected water body which is not smaller than the total internal volumes of the water inlet pipe, the submersible pump, the drainage cover and the water outlet pipe which are transferred is discharged after being pumped out, and the water body pumped out by the follow-up pumping is collected into the water sample collecting device, so that the sampling work is completed.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1. a water outlet; 2. a submersible pump; 3. a drainage cover; 4. introducing a fluid; 5. a water inlet pipe orifice; 6. a water inlet; 7. a water outlet pipe; 8. a water inlet pipe; 9. the lace pipe pendant; 10. well casing, 11, filter.
Detailed Description
As shown in figure 1, the liquid level approaching ultra-deep sampling pump comprises a submersible pump 2, a drainage body 4, a drainage cover 3, a water inlet pipe 8, a water outlet pipe 7 and the like, wherein the submersible pump 2 adopts a vertical cylindrical submersible pump with a commercially available water inlet arranged on the side wall, the drainage cover 3 is arranged on the outer wall of the submersible pump 2, the drainage body 4 is arranged at the lower end of the submersible pump 2, the water outlet 1 of the submersible pump 2 is connected with the water outlet pipe 7 connected with an acquisition system on the ground, and the lower end of the drainage cover 3 is connected with the water inlet pipe 8.
The drainage body 4 of the invention is of an upper and lower two-section structure, wherein the upper section is a cylinder with the diameter equal to that of the submersible pump 2, the lower section is a cone structure with a downward conical top, and the conical bottom of the cone structure is also equal to that of the submersible pump 2 and is butted on the lower end surface of the cylinder. The central line of the cylinder of the fluid guiding body 4 is coincided with the central line of the cone to form an integral axial piece. The fluid guiding body 4 is butted at the lower end of the submersible pump 2, the upper end surface of the cylinder of the fluid guiding body 4 is butted with the lower end surface of the submersible pump 2, and the axial lead of the fluid guiding body 4 and the axial lead of the submersible pump 2 are on the same straight line, so that the change of water flow entering the device is smooth.
The drainage cover 3 is a barrel structure with an opening at the upper end and a conical bottom with a downward conical top sealed at the lower end, the bottom of the barrel structure is communicated with a water inlet pipe orifice 5 extending outside, namely the water inlet pipe orifice 5 is communicated with the conical top of the conical bottom at the bottom of the drainage cover 3, and the water inlet pipe orifice 5 is vertically arranged downwards. The drainage cover 3 is sleeved outside the submersible pump 2 in a penetrating way from the lower end of the submersible pump 2 provided with the drainage fluid 4, and the upper end opening of the drainage cover 3 is sealed with the upper side outer wall of the water inlet 6 on the outer wall of the submersible pump 2. Thus, an annular cavity is formed, the upper end of which is communicated with the water inlet 6 of the submersible pump 2, and the lower end of which is communicated with the water inlet pipe orifice 5. The side wall of the drainage cover 3 is a cylindrical side wall, and the diameter of the cylindrical side wall is equal to the diameter of the bottom circle of the conical bottom at the bottom of the bucket body. In addition, the sealing part between the drainage cover 3 and the submersible pump 2 adopts transitional arc sealing so as to ensure that the flowing water flow changes smoothly.
The drainage cover 3, the drainage body 4 and the submersible pump 2 are coaxially arranged, the side wall of the conical bottom of the drainage cover 3 is parallel to the side wall of the cone of the drainage body 4, the longitudinal sectional area of the passing axis in the annular cavity is equal everywhere, and the minimum sectional area of the annular cavity is not larger than the sectional area of the water inlet pipe orifice 5, so that the water flowing through the annular cavity has no negative pressure when being sampled in deep water. The pipe diameter of the water inlet pipe orifice 5 is 2-3 times of the pipe diameter of the water outlet 1 of the submersible pump 2, the ratio of the bottom circle diameter of the conical bottom of the drainage cover 3 to the height of the conical bottom is set to be 1/2-1/3, and the ratio of the bottom circle diameter of the cone of the drainage body 4 to the height of the cone is also set to be 1/2-1/3, so that when underground water enters the annular cavity from the water inlet pipe orifice 5, the flow velocity of the water changes smoothly, the disturbance to substances in the water is reduced as much as possible, the fidelity of a sample is improved, and the state change of unstable substances in the water is avoided.
When the deep water sampling device is used for deep water sampling, the submersible pump 2 is submerged to a position close to about 0.5m of the water surface under the deep water, the water outlet 1 of the submersible pump 2 is connected with the water outlet pipe 7, the water outlet pipe 7 is connected with the water sample collecting device on the ground, the water inlet pipe 8 connected with the lower end of the drainage cover 3 on the outer wall of the submersible pump 2 vertically extends downwards to the sampling position of a water well, and the submersible pump 2 is started to perform deep water sampling work. The length of the water inlet pipe 8 can be set according to the sampling depth of the water body, and the sampling device is not limited by factors such as the lift of a sampling device, such as a water pump, the pressure bearing capacity of various depth-fixed sampling containers and the like. In order to keep the water inlet pipe 8 in a vertical state in the deepwater sampling process, the free end of the water inlet pipe 8 is provided with the flower net pipe pendant 9, the flower net pipe pendant 9 is provided with a plurality of fine water inlet holes, and the flower net pipe pendant 9 is of a mesh shell structure, so that the submersible pump can be prevented from being damaged due to the fact that sundries in water enter a pump body in the pumping and sampling process.
The drainage cover 3 and the drainage body 4 are both made of corrosion-resistant rigid materials so as to prevent corrosion and influence the detection result of the collected water sample. The water outlet pipe 7 and the water inlet pipe 8 are both soft plastic pipes, and are convenient to store and use.
When the invention is used for sampling deep water, only the submersible pump 2 is needed to be submerged below the liquid level in the well, the water outlet 1 of the submersible pump 2 is connected with a water sample collecting device arranged on the ground through the water outlet pipe 7, and the water inlet pipe 8 connected to the lower end of the drainage cover 3 vertically extends to the range of the filter 11 of the deep well. Although the submersible pump 2 of the near-liquid-level ultra-deep sampling device is arranged close to the liquid level of the well pipe, the submersible pump can directly collect water samples in the range of the water well filter 11 without completely extracting the water body in the whole well pipe, thereby not only reducing the waste of water resources and the secondary environmental pollution caused by the discharge of polluted water bodies, but also saving electric energy and reducing the energy consumption and the cost of water sample collection due to the great reduction of the well water extraction amount.
The use method of the near liquid level ultra-deep sampling device comprises the following steps:
a. the distance between the water liquid level of the well in the water well to be sampled and the well mouth is measured, and the throwing depth of the submersible pump 2 in the water well to be sampled is determined according to the distance, so that the water outlet 1 of the submersible pump 2 can be submerged below the water liquid level of the well after throwing.
b. According to the well pipe structure data of the well to be sampled and the measured data of the distance between the well water liquid level and the wellhead, the distance between the filter 11 at the lower part of the well pipe and the well water liquid level and the configuration length of the required water outlet pipe 7 are respectively calculated, and the water inlet pipe 8 with the corresponding length is intercepted according to the calculation result.
c. One end of the intercepted water inlet pipe 8 is fixedly connected to the lower port of the drainage cover 3, and the other end of the intercepted water inlet pipe is fixedly connected to the interface of the flower net pipe pendant 9;
d. a flower net pipe drop 9, a water inlet pipe 8, a submersible pump 2, a drainage cover 3 and a water outlet pipe 7 which are connected in sequence are put down in a water well to be sampled; according to the size marked on the pipe wall of the water outlet pipe 7, after the submersible pump 2 which is lowered is determined to be completely submerged in the well water level, the lowering operation is stopped, at the moment, the water inlet pipe 8 is straightened in the well pipe by the flower net pipe pendant 9, and the flower net pipe pendant 9 is just suspended at the position to be sampled in the well pipe;
e. the total internal volumes of the water inlet pipe 8, the submersible pump 2, the drainage cover 3 and the water outlet pipe 7 which are transferred are calculated, the submersible pump 2 is started, the initially collected water body which is not smaller than the total internal volumes of the water inlet pipe 8, the submersible pump 2, the drainage cover 3 and the water outlet pipe 7 which are transferred is discharged after being pumped out, and the water body which is pumped out by the follow-up pumping is collected into the water sample collecting device, so that the sampling work is completed.
Claims (5)
1. The utility model provides a face liquid level ultra-deep sampling device which characterized by includes:
the submersible pump is a cylindrical pump body, a water outlet pipe used for guiding the water to the ground is connected to a water outlet at the top of the submersible pump, scale marks representing the length of the water outlet pipe are marked on the pipe wall of the water outlet pipe, and one end of the starting point of the scale marks of the water outlet pipe of the marking column is connected to the water outlet of the submersible pump;
the upper part of the fluid guide is a cylindrical pipe body with the same diameter as the submersible pump, the lower part of the fluid guide is a cone with the downward top, and the fluid guide is arranged at the lower end of the submersible pump and used for reducing disturbance to pumped liquid;
the drainage cover is a cover body which covers the periphery of the submersible pump and the drainage fluid, the cover body comprises a large-diameter section positioned at the upper part, a small-diameter section positioned at the lower part and a reducing section for connecting the large-diameter section and the small-diameter section, the upper end opening of the large-diameter section is sealed on a pump body at the upper part of a water inlet annular opening of the submersible pump, the reducing section corresponds to a lower cone of the drainage fluid, the taper of the reducing section is consistent with that of the lower cone of the drainage fluid, the diameter of the small-diameter section is larger than that of the water outlet pipe, and the sectional area of an annular cavity formed between the large-diameter section and the reducing section and the drainage fluid is not larger than that of the small-diameter section;
the upper end of the water inlet pipe is connected to the thin pipe section of the drainage cover, and the lower end of the water inlet pipe is connected with the flower net pipe drop; and
the mesh pipe drop is arranged at a filter at the lower part of the deep well and used for collecting underground water and providing pull-down gravity for keeping a water inlet pipe in a straight state; the structure is that the bottom of a section of straight-wall lattice net pipe is connected with a conical bottom plate, the top of the straight-wall lattice net pipe is connected with an annular top plate, and the inner circle of the annular top plate is connected with a connector which is used for connecting the water inlet pipe.
2. The liquid level approaching ultra-deep sampling device of claim 1, wherein the centerlines of the upper cylindrical tube body and the lower cone of the fluid guide are aligned with the centerline of the submersible pump.
3. The liquid level adjacent ultra-deep sampling device of claim 1, wherein the centerlines of the large diameter section, the small diameter section and the variable diameter section on the flow guide cover are on a straight line, and after installation, the centerline of the flow guide cover coincides with the centerline of the submersible pump.
4. The liquid level adjacent ultra-deep sampling device as claimed in claim 2, wherein the ratio of the diameter of the bottom circle of the cone at the lower end of the drainage body to the height of the cone is 1/2-1/3.
5. A method of using the meniscus ultra-deep sampling apparatus of claim 1, comprising the steps of:
a. measuring the distance between the surface of the well water in the water well to be sampled and the well mouth, and determining the throwing depth of the submersible pump in the water well to be sampled according to the distance so as to enable the water outlet of the submersible pump to be submerged below the surface of the well water after throwing;
b. respectively calculating the distance between a filter at the lower part of a well pipe and the well water liquid level and the configuration length of a required water inlet pipe according to well pipe structure data of a well to be sampled and measured distance data between the well water liquid level and a well mouth, and intercepting the water inlet pipe with corresponding length according to the calculation result;
c. one end of the intercepted water inlet pipe is fixedly connected to the lower port of the drainage cover, and the other end of the intercepted water inlet pipe is fixedly connected to the interface of the flower net pipe pendant;
d. a flower net pipe drop, a water inlet pipe, a submersible pump, a drainage cover and a water outlet pipe which are connected in sequence are put down in a water well to be sampled; according to the size marked on the pipe wall of the water outlet pipe, after the submersible pump which is lowered is determined to be completely submerged in the water level of the well, the lowering operation is stopped, at the moment, the water inlet pipe is straightened in the well pipe by the flower net pipe weight, and the flower net pipe weight is just suspended at the position to be sampled in the well pipe;
e. the total internal volumes of the water inlet pipe, the submersible pump, the drainage cover and the water outlet pipe which are transferred are calculated, the submersible pump is started, the initially collected water body which is not smaller than the total internal volumes of the water inlet pipe, the submersible pump, the drainage cover and the water outlet pipe which are transferred is discharged after being pumped out, and the water body pumped out by the follow-up pumping is collected into the water sample collecting device, so that the sampling work is completed.
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| JPH0835979A (en) * | 1994-07-21 | 1996-02-06 | Kajima Corp | Under ground-water sampling/flow-measuring apparatus |
| JPH0925783A (en) * | 1995-07-10 | 1997-01-28 | Power Reactor & Nuclear Fuel Dev Corp | Packer type underground water collecting device and collecting method |
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| CN110907226A (en) | 2020-03-24 |
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