Quantitative extraction device for underground water sample

Abstract

The utility model belongs to the technical field of underground water sampling, and particularly discloses a quantitative extraction device for an underground water sample, which is used for solving the technical problems that soil falls off and is mixed into well water, so that sampling is inaccurate, and a suction pump is blocked as a sampling pipe cannot vertically fall to rub a well wall in the downward probing process. Comprising a fixing plate, an inner limiting ring is arranged in the middle of the fixing plate, and a sampling pipe is inserted into the inner limiting ring; therefore, the motor can be used for driving the feeding wheel to rotate and driving the sampling pipe to be fed downwards at a constant speed, the sampling pipe can vertically move towards the underground in a centered manner and does not collide and rub with the well wall under the assistance of pre-centered assembly, the filter cartridge can vertically move downwards along with the centered sampling pipe, and a water sample enters the filter cartridge and is blocked by the sealing plate, so that the sampling pipe is prevented from being blocked by the sealing plate. Double filtration of a water sample is completed through the filter element for the second time after penetrating through the filter element for the first time, so that impurity-free sampling of an underground water sample is ensured, and meanwhile, blockage of a suction pump is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of groundwater sampling, in particular to a quantitative extraction device for groundwater samples. Background Art

[0002] The quality of groundwater will change with depth, so choosing the right sampling depth is very important for obtaining accurate water quality analysis results. Generally speaking, the groundwater sampling depth should be selected close to the surface to ensure the representativeness of the water sample, while avoiding problems such as possible mixing of rock particles and insufficient dissolved oxygen caused by sampling too deep. When choosing the sampling depth, the following factors should generally be considered: Purpose: Different sampling purposes require sampling of groundwater at different depths. For example, the hydrochemistry of groundwater varies greatly, so it is necessary to collect water samples at different depths for comparison; or it is necessary to collect certain specific pollutants in groundwater; Geological conditions: high or low groundwater levels, distribution of aquifers, rock types and other factors can affect the law of groundwater quality changes, thereby affecting the choice of sampling depth.

[0003] In the prior art, sampling of groundwater through existing wells requires inserting a sampling tube into the well and collecting water samples at different depths. However, some existing wells lack a hard structure of the well wall. During the process of the sampling tube being inserted into the well, it is impossible to drop vertically all the way down and rub against the well wall, causing mud to fall off and mix into the well water, which not only causes inaccurate sampling, but also blocks the suction pump.

[0004] In view of the above technical defects, a solution is now proposed. Utility Model Content

[0005] The utility model aims to provide a quantitative extraction device for groundwater samples, so as to solve the problem that the sampling tube cannot fall vertically throughout the whole process and scrapes against the well wall, causing mud to fall off and mix into the well water, which not only causes inaccurate sampling, but also blocks the suction pump.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a quantitative extraction device for groundwater samples, comprising a fixed plate, an inner limit ring is arranged in the middle of the fixed plate, a sampling tube is inserted in the inner limit ring, the sampling tube is a hard tube body, a suction pump is arranged at the end of the sampling tube extending below the fixed plate, a submerged frame is installed at the suction end of the suction pump, a filter cartridge is embedded in the inner top end of the submerged frame, a filter element is arranged in the filter cartridge, and the filter cartridge is connected to the suction end of the suction pump; a centering mechanism is arranged on the upper surface of the inner limit ring, the centering mechanism includes at least three feed wheels, and the feed wheels are in contact with the outer surface of the sampling tube.

[0007] Preferably, the centering mechanism also includes a mounting seat, which is mounted on the upper surface of the inner limit ring, and the feed wheel is rotatably arranged on the inner side of the mounting seat, a motor is arranged on the outer side of the mounting seat, the motor is drivingly connected to the feed wheel, and the wheel surface of the feed wheel is provided with anti-slip grooves.

[0008] Preferably, a bottom cover is provided at the bottom of the filter cartridge, and a water inlet is opened through the outer side of the bottom cover, the bottom of the filter element abuts against the bottom cover, and a core frame is provided at the top of the filter cartridge, and the core frame is snap-connected with the top of the filter element.

[0009] Preferably, a sealing plate is provided at the lower part of the filter cartridge, the sealing plate is connected to the bottom cover, and the outer end of the sealing plate is flush with the outer side of the filter element, and the submersible frame is covered on the outside of the filter cartridge and is hollow.

[0010] Preferably, a drain pipe is provided at the output end of the suction pump, and the drain pipe is connected to the sampling tube. The upper end of the suction pump close to the drain pipe is sleeved with a symmetrically arranged upper water-breaking cover and a lower water-breaking cover, and the upper water-breaking cover and the lower water-breaking cover are both umbrella-shaped and sleeved to the outside of the bottom of the sampling tube.

[0011] Preferably, a plurality of brackets are arranged downward on the outer side of the fixing plate, and the brackets are hook-shaped and have their bottom ends flush with each other.

[0012] Beneficial effects of the utility model:

[0013] (1) In the present invention, the bracket on the fixed plate is used to complete the insertion in the soil beside the wellhead, and the sampling tube is pre-centered according to the insertion depth and the coincidence state between the sampling tube and the center of the wellhead. Then, the motor is started to drive the feed wheel to rotate and drive the sampling tube to feed downward at a uniform speed, which means that the sampling tube can move vertically down the well without colliding or scratching with the well wall, ensuring that the well wall will not fall off the soil to reduce the accuracy of the water sample;

[0014] (2) In the present invention, as the sampling tube is continuously fed by the motor and the feed wheel, the speed of the motor can be controlled so that the number of revolutions of the feed wheel can be controlled, that is, the length of the sampling tube fed can also be known. Therefore, the depth of the sampling tube and the filter cartridge entering the water sample can also be known. When the start-up time of the suction pump is constant, quantitative extraction of groundwater samples is achieved through the mutual cooperation with the central vertical downward movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings;

[0016] Figure 1 It is a structural stereogram of the entire utility model;

[0017] Figure 2 It is a schematic diagram of the structure of the utility model when viewed from above;

[0018] Figure 3 It is a detailed diagram of the centering mechanism of the utility model;

[0019] Figure 4 It is a schematic diagram of the installation structure of the filter cartridge of the utility model;

[0020] Figure 5 It is a partial structural cutaway schematic diagram of the filter cartridge of the utility model;

[0021] Figure 6 It is a side sectional view of the utility model.

[0022] Legend: 1. Fixed plate; 2. Suction pump; 3. Submerged frame; 4. Sampling tube; 5. Bracket; 6. Upper water-breaking cover; 7. Lower water-breaking cover; 8. Filter cartridge; 9. Inner limit ring; 10. Mounting seat; 11. Motor; 12. Feed wheel; 13. Drain pipe; 14. Bottom cover; 15. Water inlet; 16. Filter element; 17. Sealing plate; 18. Core frame. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Embodiment 1:

[0025] This embodiment is used to solve the problem that the sampling tube cannot fall vertically during the exploration process and scrapes against the well wall, causing soil to fall off and mix into the well water, resulting in inaccurate sampling. Specifically, a rough centering structure is set at the wellhead to achieve the purpose of accurate sampling by setting the sampling pipe vertically. The content is as follows:

[0026] See also Figure 1 - Figure 6As shown, this embodiment is a quantitative extraction device for groundwater samples, including a fixed plate 1, a plurality of brackets 5 are arranged on the outer side of the fixed plate 1 facing downward, the brackets 5 are hook-shaped and the bottom ends are flush, an inner limit ring 9 is arranged in the middle of the fixed plate 1, a sampling tube 4 is inserted in the inner limit ring 9, the sampling tube 4 is a hard tube body, and a suction pump 2 is arranged at the end of the sampling tube 4 extending to the bottom of the fixed plate 1, a submerged frame 3 is installed at the suction end of the suction pump 2, a filter cartridge 8 is embedded in the inner top end of the submerged frame 3, a filter element 16 is arranged in the filter cartridge 8, and the filter cartridge 8 is connected to the suction end of the suction pump 2; a centering mechanism is arranged on the upper surface of the inner limit ring 9, and the centering mechanism includes at least three feed wheels 12, and the feed wheel 12 is in contact with the outer surface of the sampling tube 4;

[0027] The centering mechanism also includes a mounting seat 10, which is mounted on the upper surface of the inner limit ring 9, and a feed wheel 12 is rotatably arranged on the inner side of the mounting seat 10, and a motor 11 is arranged on the outer side of the mounting seat 10, and the motor 11 is drivingly connected to the feed wheel 12, and the wheel surface of the feed wheel 12 is provided with anti-slip grooves;

[0028] See Figure 1 - Figure 3 As shown, the entire groundwater sample extraction device is moved to the side of the sampling well, and the bracket 5 on the fixed plate 1 is inserted into the soil beside the wellhead, and the depth of the bracket 5 inserted into the soil is combined with the coincidence of the sampling tube 4 and the center of the wellhead to determine whether it is centered. In the process of the sampling tube 4 probing downward, after the motor is started, it drives the feed wheel 12 to rotate and drives the sampling tube 4 to feed downward at a uniform speed, and the feeding correction of the sampling tube 4 is completed through the pre-set centering setting combined with multiple feed wheels 12, so that the sampling tube 4 does not collide or scratch with the well wall during the vertical movement downward, ensuring that the well wall will not fall off the soil to reduce the accuracy of the water sample.

[0029] Embodiment 2:

[0030] This embodiment is used to solve the problem of blockage during the process of the sampling water pipe being probed downward and the water sample being extracted by the suction pump, specifically:

[0031] See also Figure 1 - Figure 6 As shown, a quantitative extraction device for groundwater samples of this embodiment includes a bottom cover 14 provided at the bottom of a filter cartridge 8, and a water inlet 15 is opened on the outside of the bottom cover 14 of the filter cartridge 8, the bottom of a filter element 16 is abutted against the bottom cover 14, and a core frame 18 is provided at the top of the filter cartridge 8, and the core frame 18 is snap-fitted with the top of the filter element 16 to form a quick fixation of the filter element 16;

[0032] A sealing plate 17 is provided at the lower part of the interior of the filter cartridge 8, the sealing plate 17 is connected to the bottom cover 14, and the outer end of the sealing plate 17 is flush with the outer side of the filter element 16, the submerged frame 3 is covered on the outside of the filter cartridge 8 and is hollow, wherein the submerged frame 3 is provided to provide a buffering effect to prevent the suction pump 2 from directly colliding with the bottom of the well during the downward vertical movement, a drain pipe 13 is provided at the output end of the suction pump 2, the drain pipe 13 is connected to the sampling tube 4, and the upper end of the suction pump 2 near the drain pipe 13 is sleeved with a symmetrically arranged upper water-breaking cover 6 and a lower water-breaking cover 7, both of which are umbrella-shaped and sleeved to the outer side of the bottom of the sampling tube 4, and the effect of the upper water-breaking cover 6 and the lower water-breaking cover 7 is to reduce the amplitude of the water-breaking oscillation during the upward and downward movement of the suction pump 2, thereby reducing the degree to which the groundwater sample is affected;

[0033] by Figure 1 - Figure 6 Detailed description: In the process of sampling groundwater samples in the sampling well, the filter cartridge 8 descends along with the sampling tube 4, and the water sample is continuously introduced from the water inlet 15 on the filter cartridge 8. The water sample enters the filter cartridge 8 and is blocked by the sealing plate 17. After passing through the filter element 16, the water sample passes through the filter element 16 again to complete double filtration. Finally, the water sample enters the sampling tube 4 from the top of the filter cartridge 8 to complete stable sampling.

[0034] It is important to note that, in combination with the above-mentioned embodiment 1, in the process of the sampling tube 4 being continuously driven to feed by the motor 11 and the feed wheel 12, the speed of the motor 11 is controllable so that the number of revolutions of the feed wheel 12 is controllable, that is, the length of the sampling tube 4 driven to feed is also known, and therefore, the depth of the sampling tube 4 and the filter cartridge 8 entering the water sample is also known. Under the condition that the start time of the suction pump 2 is constant, quantitative extraction of groundwater samples is formed by mutual cooperation with the above-mentioned embodiment 1;

[0035] In combination with Example 1 and Example 2, the motor 11 can be used to drive the feed wheel 12 to rotate and drive the sampling tube 4 to feed downward at a uniform speed, assisted by the pre-centering assembly and the correction operation of the feed wheel 12, so that the sampling tube 4 can be centered and vertically moved downward into the well without colliding or scratching the well wall. The filter cartridge 8 can also be used to move vertically downward along with the sampling tube 4. The water sample enters the filter cartridge 8 and is blocked by the sealing plate 17. After passing through the filter element 16 for the first time, it passes through the filter element 16 for the second time to complete the double filtration of the water sample. The combination of the two ensures the impurity-free collection of groundwater samples and avoids clogging of the suction pump 2.

[0036] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A quantitative extraction device for groundwater samples, comprising a fixing plate (1), characterized in that: An inner limit ring (9) is provided in the middle of the fixed plate (1), a sampling tube (4) is inserted in the inner limit ring (9), the sampling tube (4) is a hard tube body, a suction pump (2) is provided at the end of the sampling tube (4) extending below the fixed plate (1), a submersible frame (3) is installed at the suction end of the suction pump (2), a filter cartridge (8) is embedded in the inner top end of the submersible frame (3), a filter element (16) is provided in the filter cartridge (8), and the filter cartridge (8) is connected to the suction end of the suction pump (2); a centering mechanism is provided on the upper surface of the inner limit ring (9), the centering mechanism includes at least three feed wheels (12), and the feed wheels (12) are in contact with the outer surface of the sampling tube (4).

2. A quantitative extraction device for groundwater samples according to claim 1, characterized in that: The centering mechanism further comprises a mounting seat (10), the mounting seat (10) being mounted on the upper surface of the inner limit ring (9), and the feed wheel (12) being rotatably arranged on the inner side of the mounting seat (10), a motor (11) being arranged on the outer side of the mounting seat (10), the motor (11) being drivingly connected to the feed wheel (12), and the wheel surface of the feed wheel (12) being provided with anti-slip grooves.

3. A quantitative extraction device for groundwater samples according to claim 1, characterized in that: The bottom of the filter cartridge (8) is provided with a bottom cover (14), and the filter cartridge (8) is provided with a water inlet (15) through the outer side of the bottom cover (14); the bottom of the filter element (16) is abutted against the bottom cover (14); the top of the filter cartridge (8) is provided with a core frame (18), and the core frame (18) is snap-connected with the top of the filter element (16).

4. A quantitative extraction device for groundwater samples according to claim 3, characterized in that: A sealing plate (17) is provided at the lower part of the filter cartridge (8), the sealing plate (17) is connected to the bottom cover (14), and the outer end of the sealing plate (17) is flush with the outer side of the filter element (16), and the submersible frame (3) is covered on the outside of the filter cartridge (8) and is hollow.

5. A quantitative extraction device for groundwater samples according to claim 4, characterized in that: The output end of the suction pump (2) is provided with a drainage pipe (13), and the drainage pipe (13) is connected to the sampling tube (4). The upper end of the suction pump (2) close to the drainage pipe (13) is sleeved with a symmetrically arranged upper water-breaking cover (6) and a lower water-breaking cover (7), and the upper water-breaking cover (6) and the lower water-breaking cover (7) are both umbrella-shaped and sleeved to the outside of the bottom of the sampling tube (4).

6. A quantitative extraction device for groundwater samples according to claim 1, characterized in that: A plurality of brackets (5) are arranged downwardly on the outer side of the fixing plate (1); the brackets (5) are hook-shaped and have their bottom ends flush with each other.

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