CN217237373U

CN217237373U - In-situ soil gas quantitative collecting device

Info

Publication number: CN217237373U
Application number: CN202123428032.6U
Authority: CN
Inventors: 蔡冰杰; 王栋; 王长明; 邱成浩; 聂溧
Original assignee: Jiangsu Environmental Engineering Technology Co Ltd
Current assignee: Jiangsu Environmental Engineering Technology Co Ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-08-19
Anticipated expiration: 2031-12-31

Abstract

The utility model discloses an in-situ soil gas quantitative acquisition device, which comprises a sampling cylinder, a cylinder cover and a sealing component for sealing the bottom end of the sampling cylinder after sampling, wherein the sampling cylinder comprises an inner cylinder, a heat-preserving cylinder sleeved on the inner cylinder and an outer cylinder sleeved on the heat-preserving cylinder from inside, an electric heating element is arranged between the inner cylinder and the heat-preserving cylinder, the sampling cylinder is provided with an air duct communicated with the inner cylinder, and a cavity between the heat-preserving cylinder and the outer cylinder forms an accommodating space of the sealing component; the cover is movably connected to the top end of the sampling tube, and the cover is communicated with an air inlet pipe. The soil survey system can effectively improve soil survey efficiency and accuracy, and has high practicability and popularization value.

Description

In-situ soil gas quantitative collecting device

Technical Field

The utility model relates to an environmental protection technical field especially relates to a normal position soil gas ration collection system.

Background

Currently, soil and underground water are mainly used as media in soil investigation, and soil samples and underground water samples are collected and sent to a detection laboratory for detection, so that the soil pollution condition is determined. The investigation methods have some disadvantages in the actual field investigation process, are often low in efficiency, and cannot effectively solve emergency projects. Soil gas, which is one of the three-phase constituents of soil, generally accounts for about 20-30% of the volume of soil and is distributed mainly in soil pores. For organic pollution sites, investigation aiming at soil gas can effectively improve investigation efficiency and reduce investigation time.

The existing soil gas investigation technology is mainly divided into a gas phase extraction method and a film interface detection technology. The soil gas phase extraction method is characterized in that a vacuum pump is used for extraction to generate negative pressure, when air flows through a polluted area, volatile and semi-volatile organic pollutants in soil pores are desorbed and carried away by airflow, and sometimes, a gas injection well can be arranged to manually introduce air into soil during extraction; the membrane interface detection technology is mainly used for site volatile organic compound in-situ detection, the result of the detection reflects the total amount of organic compounds rather than the concentration of single substances, and the detection can assist in judging the organic pollution degree of a plot and quickly judge the pollution space distribution condition of the site. However, the gas phase extraction method in the two methods has simple structure, poor extraction effect on organic pollutants in soil gas and long extraction time; the membrane interface detection technology can only reflect the total amount of organic matters in a small range reached by the probe, and cannot acquire more accurate pollutant data.

How to improve the soil gas investigation efficiency and the investigation accuracy and scientifically and reasonably analyze the soil pollution condition is an urgent problem to be solved in the relevant work of organic contaminated soil investigation.

SUMMERY OF THE UTILITY MODEL

In order to overcome the not enough of prior art, the utility model aims to provide an normal position soil gas ration collection system, it can effectively improve soil investigation efficiency and accuracy, has higher practicality and spreading value.

In order to solve the above problem, the utility model discloses the technical scheme who adopts as follows:

a quantitative in-situ soil gas collecting device comprises a sampling cylinder, a cylinder cover and a sealing component for sealing the bottom end of the sampling cylinder after sampling, wherein the sampling cylinder internally comprises an inner cylinder, a heat-insulating cylinder sleeved on the inner cylinder and an outer cylinder sleeved on the heat-insulating cylinder; the cover is movably connected to the top end of the sampling tube, and the cover is communicated with an air inlet pipe.

Preferably, the heat preservation cylinder is made of rock wool.

Preferably, the sealing assembly comprises a soil sealing claw and a hydraulic rod, the soil sealing claw can be arranged in the accommodating space in a vertically sliding mode, one end of the hydraulic rod is connected to the inner wall of the outer barrel, and the other end of the hydraulic rod is hinged to the soil sealing claw.

Preferably, the soil sealing claws are more than two, and the more than two soil sealing claws are matched to form a closed structure.

Preferably, the longitudinal section of the soil sealing claw is arc-shaped.

Preferably, the top end of the soil sealing claw abuts against the inner wall of the outer cylinder, and the bottom end of the soil sealing claw abuts against the outer wall of the heat preservation cylinder.

Preferably, the sealing assembly further comprises a support ring which can be sleeved in the accommodating space in a vertically sliding mode, the soil sealing claw is hinged to the support ring, and the other end of the hydraulic rod is connected with the support ring.

Compared with the prior art, the beneficial effects of the utility model reside in that: by adopting the middle sampling device, the investigation efficiency and the accuracy of the organic pollution plots can be fully improved; in addition, the device can effectively isolate heat in the using process, and secondary pollution caused by volatilization of organic matters in the soil at the periphery of the sampling cylinder is avoided; the device has the advantages of simple structure, simple and convenient sampling method, and higher practicability and popularization value.

Drawings

FIG. 1 is a schematic structural view of an in-situ soil gas quantitative collection device in a preferred embodiment of the present invention;

FIG. 2 is a schematic view of the sampling cartridge of FIG. 1;

FIG. 3 is a longitudinal cross-sectional view of the soil sealing claw of FIG. 2;

wherein, 1 is a sampling tube, 10 is an air duct, 11 is an inner cylinder, 12 is a heat preservation cylinder, 13 is an outer cylinder, 2 is a cylinder cover, 21 is an air inlet pipe, 3 is a sealing component, 30 is a rotating shaft, 31 is a soil sealing claw, 32 is a hydraulic cylinder, and 33 is a support ring.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1-3, in order to provide a quantitative in-situ soil gas collecting device in the preferred embodiment of the present invention, the device comprises a sampling cylinder 1, a cylinder cover 2 and a sealing component 3 for sealing the bottom end of the sampling cylinder 1 after sampling, wherein the sampling cylinder 1 internally comprises an inner cylinder 11, a heat-preserving cylinder 12 sleeved on the inner cylinder 11 and an outer cylinder 13 sleeved on the heat-preserving cylinder 12, an electric heating element is arranged between the inner cylinder 11 and the heat-preserving cylinder 12, the sampling cylinder 1 is provided with an air duct 10 communicated with the inner cylinder 11, and a cavity between the heat-preserving cylinder 12 and the outer cylinder 13 forms an accommodating space of the sealing component; the cover 2 is movably connected to the top end of the sampling tube 1, and the cover 2 is communicated with an air inlet pipe 21. The utility model discloses during the use, the organic contaminated soil of impressing the sampler barrel 1, cover the cover 2, and seal the completion back to 1 bottom of sampler barrel with seal assembly 3, open the sample soil of heating member in to inner tube 11 and heat, pump into quantitative gas in to inner tube 11 through intake pipe 21, collect the soil gas that the thermal evaporation produced in air duct 10 department, leading-in air bag or lug connection gas chromatography-mass spectrometer, begin to carry out VOC concentration measurement, realize the normal position ration collection of soil gas, can effectively improve soil investigation efficiency and accuracy, higher practicality and spreading value have.

Specifically, the heat-insulating cylinder 12 is made of rock wool in order to prevent heat from dissipating to the outer cylinder during heating and reduce volatilization of VOC or SVOC in soil polluted outside the pipe due to heating. Furthermore, a reflecting film can be arranged between the heat-preserving cylinder 12 and the heating element for reflecting heat, thereby further reducing the heat loss to the outside.

Specifically, the sealing assembly 3 comprises a soil sealing claw 31 and a hydraulic rod 32, wherein the soil sealing claw 31 can be arranged in the accommodating space in a vertically sliding manner, one end of the hydraulic rod 32 is connected to the inner wall 13 of the outer cylinder, and the other end of the hydraulic rod is hinged to the soil sealing claw 31. The circuit switch of hydraulic stem 32 and heating member can set up on bung 2, and when bung 2 lid was on sampler barrel 1, the heating member began to heat, and simultaneously, hydraulic stem 32 opened, will seal the accommodation space that soil claw 31 released, constitutes enclosed construction in the bottom of sampler barrel. Furthermore, the number of the soil sealing claws 31 is more than two, and the more than two soil sealing claws 31 are matched to form a semi-spherical sealing structure. In order to ensure that a closed structure is formed after the push-out, the longitudinal section of the soil sealing claw 31 is arc-shaped, the top end of the soil sealing claw 31 abuts against the inner wall of the outer cylinder 13, and the bottom end of the soil sealing claw abuts against the outer wall of the heat preservation cylinder 12. After the bottom of the soil sealing claw 31 is pushed out of the accommodating space, the soil sealing claw moves downwards and simultaneously releases the line to the circumferential axis of the sampling tube, and finally the soil sealing claw is closed to form a semi-spherical closed structure.

Specifically, in order to ensure the uniformity of the up-and-down movement of each soil sealing claw 31 in the accommodating space, the sealing assembly 3 further comprises a support ring 33 which can be slidably sleeved in the accommodating space up and down, the soil sealing claws 31 are hinged to the support ring 33, and the other end of the hydraulic rod 32 is connected with the support ring 33.

The utility model discloses during the use, the organic contaminated soil of impressing sampling cylinder 1, cover the cover 2 to seal the completion back with closing assembly 3 to sampling cylinder 1 bottom, open the heating member and heat the sample soil in the inner tube 11, pump into quantitative gas in to inner tube 11 through intake pipe 21, collect the soil gas that the thermal evaporation produced in air duct 10 department, realize the normal position ration collection of soil gas, can effectively improve soil investigation efficiency and accuracy, higher practicality and spreading value have.

Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes are intended to fall within the scope of the claims.

Claims

1. The in-situ soil gas quantitative acquisition device is characterized by comprising a sampling cylinder, a cylinder cover and a sealing component for sealing the bottom end of the sampling cylinder after sampling, wherein the sampling cylinder comprises an inner cylinder, a heat-insulating cylinder sleeved on the inner cylinder and an outer cylinder sleeved on the heat-insulating cylinder from inside; the cover is movably connected to the top end of the sampling tube, and the cover is communicated with an air inlet pipe.

2. The in-situ soil gas quantitative collection device of claim 1, wherein said thermal insulating cylinders are made of rock wool.

3. The in-situ soil gas quantitative collection device of claim 1 wherein said sealing assembly comprises a soil sealing claw and a hydraulic rod, said soil sealing claw is slidably disposed in said receiving space, one end of said hydraulic rod is connected to the inner wall of said outer cylinder, and the other end of said hydraulic rod is hinged to said soil sealing claw.

4. The in-situ soil gas quantitative collection device of claim 3, wherein said soil sealing claws are two or more, and said two or more soil sealing claws cooperate to form a closed structure.

5. The in-situ soil gas quantitative collection device of claim 3, wherein said soil sealing claw is arcuate in longitudinal cross-section.

6. The in-situ soil gas quantitative collection device of claim 5 wherein said soil sealing claw has a top end abutting against the inner wall of the outer cylinder and a bottom end abutting against the outer wall of the heat-insulating cylinder.

7. The in-situ quantitative soil gas collection device of claim 3, wherein said closure assembly further comprises a support ring slidably disposed in said receiving space, said soil sealing claw is hinged to said support ring, and the other end of said hydraulic rod is connected to said support ring.