A soil gas stratified sampler and sampling well washing method

Abstract

The present invention provides a soil gas stratified sampler and a sampling and well washing method, comprising a sampling mechanism, which is composed of a sampling body, a sampling probe, a sampling probe head, a plurality of connecting mechanisms, and an extension rod twice the number of the connecting mechanisms, and is used for stratified sampling of soil and determining an optimal sampling time; a well washing mechanism, which is used for injecting a well washing medium from a sampling device and carrying the medium in a wellbore to the ground, thereby changing the medium properties in the wellbore to meet the operation requirements; a filter mechanism, which is arranged on one side inside the sampling body, and is used for filtering the sampled medium and conveying the filtered medium to an analyzer for analysis and processing; a medium transmission hose, which is arranged between the sampling mechanism and the filter mechanism, and is used for transmitting the acquired medium. The present invention can rapidly detect the concentrations of various gases in the soil in a stratified manner, and can remove water and dust from the gas, which is beneficial for subsequent analysis of the sampled gas.

Description

Technical Field

[0001] The invention relates to the technical field of soil quality evaluation, and in particular to a soil gas stratified sampler and a sampling well washing method. Background Art

[0002] Today, soil gas analysis is mainly used to assess contaminated sites and remediate them. On the one hand, it is used for pre-identification and preliminary investigations to identify the focus of contamination. On the other hand, it is used for soil gas monitoring during the implementation of remediation measures, and finally, after the remediation measures are completed, soil gas analysis can also be used for final checks. Another focus of soil gas analysis is the control of landfills. Traditional soil gas sampling methods are very simple, some are just a hose placed in a sampling well.

[0003] Traditional sampling instruments cannot determine the optimal sampling time for the point when collecting VOCs. The data is severely distorted, cannot truly reflect the actual soil conditions, and have poor repeatability. They cannot adjust the sampling flow rate according to the actual monitoring wells, nor can they remove water and dust from the sampled gas. Although the existing soil gas samplers are economical, they are far from meeting the current investigation and assessment of contaminated sites. Summary of the invention

[0004] In view of the defects and shortcomings of the prior art, the present invention provides a soil gas stratified sampler and a sampling and well washing method. To achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0005] A soil gas stratification sampler, comprising

[0006] The sampling mechanism is composed of a sampling body, a sampling probe, a sampling probe head, a plurality of connecting mechanisms, and extension rods twice the number of the connecting mechanisms, and is used for stratified sampling of soil and determining the best sampling time;

[0007] Well-washing mechanism is used to inject well-washing medium from the sampling device, carry the medium in the wellbore to the surface, and thus change the properties of the medium in the wellbore to meet the operation requirements;

[0008] A filtering mechanism is arranged at one side of the sampling body, and is used to filter the sampled medium and transport the filtered medium to the analyzer for analysis and processing;

[0009] The medium transmission hose is arranged between the sampling mechanism and the filter mechanism and is used for transmitting the acquired medium.

[0010] Preferably, the outer end surface of the sampling body is respectively provided with a first right-angle elbow, a second right-angle elbow, a third right-angle elbow, a fourth right-angle elbow and a fifth right-angle elbow, one end of the first medium transmission hose is connected to the sampling probe located at the bottom of the sampling body, the other end of the first medium transmission hose is connected to one end of the first right-angle elbow located on one side of the outside of the sampling body, the other end of the first right-angle elbow is connected to one end of the second right-angle elbow through a second medium transmission hose, a second right-angle thin elbow corresponding to the second right-angle elbow is provided on one side of the interior of the sampling body, one end of the second right-angle thin elbow is pressed into the second right-angle elbow, and the other end of the second right-angle thin elbow is pressed into the air inlet end of the filter mechanism, the third right-angle elbow is located on one side of the upper end surface of the filter mechanism and is connected to the air outlet end of the filter mechanism, and a panel-type adjustable filter is provided on the side of the interior of the sampling body away from the second right-angle thin elbow Adjust the gas flow meter, one end of the third medium transmission hose is connected to the third right-angle elbow, the other end of the third medium transmission hose is connected to the air inlet end of the panel-type adjustable gas flow meter, one end of the fourth medium transmission hose is connected to the air outlet end of the panel-type adjustable gas flow meter, the other end of the fourth medium transmission hose is connected to the fourth right-angle elbow located on the outer side of the sampling body, one end of the fifth medium transmission hose is connected to one end of the fourth right-angle elbow, the other end of the fifth medium transmission hose is connected to the fifth right-angle elbow located on the outer side of the sampling body, one end of the sixth medium transmission hose is connected to the fifth right-angle elbow, the other end of the sixth medium transmission hose is provided with a quick-plug interface, the quick-plug interface is connected to the gas analyzer, the gas analyzer is provided with a sampling pump for providing power for the sampler, and the outer end surface of the gas analyzer is provided with a switch for controlling the sampling pump.

[0011] Preferably, the first right-angle elbow, the second right-angle elbow, the third right-angle elbow, the fourth right-angle elbow and the fifth right-angle elbow are all hinged right-angle elbows, and the second right-angle thin elbow is a PP right-angle elbow with the same inner diameter as the second right-angle elbow.

[0012] Preferably, the sampling probe arranged at the bottom end of the sampling body is a hollow tubular structure, and the end face of the sampling device arranged on one side of the sampling probe is provided with a head, and the sampling device is obliquely connected to the sampling probe. The sampling device is used to inject the well washing medium into the sampling well / hole through the sampling probe, wherein the sampling device can be connected to the rubber stopper of the built-in VOC adsorption tube sleeve or the disposable syringe.

[0013] Preferably, a sealing cone is connected to the bottom of the sampling probe, and an extension rod is provided at the bottom of the sealing cone, wherein a connecting mechanism is provided between any two of the extension rods for connecting the two extension rods, and the length of a single extension rod is 1 meter. A sealing ring is provided outside the connecting mechanism for sealing the connecting gap between the extension rod and the connecting mechanism, and the sealing ring is made of any one of silicone rubber, butyl rubber, nitrile rubber, and EPDM rubber.

[0014] Preferably, the bottom end of the extension rod is connected to a sampling probe through the connecting mechanism, and a sealing ring is provided on the connecting mechanism and the outside of the extension rod for sealing the connecting gap between the extension rod and the sampling probe. The bottom of the sampling probe is an inverted cone, the diameter of the middle part of the sampling probe is smaller than the diameter of the two end parts of the sampling probe, and the outer surface of the middle part of the sampling probe is provided with evenly distributed small holes.

[0015] Preferably, the panel-type adjustable gas flow meter controls the flow rate at 80 L / h.

[0016] Preferably, the filtering mechanism is composed of a linear filter, a gasket and a circular hole filter from top to bottom. The gasket allows gas to pass through and is arranged in the middle of the linear filter and the circular hole filter to increase the contact area between the two. The inner surface of the air outlet end of the filtering mechanism is provided with a thread matching the third right-angle elbow. The air outlet end of the filtering mechanism is threadedly connected to the third right-angle elbow, and the acquired medium is filtered through the linear filter and the circular hole filter in turn.

[0017] Preferably, the circular hole filter in the filtering mechanism is a polytetrafluoroethylene microporous membrane filter with a pore size of 0.2 μm.

[0018] A sampling method of a soil gas stratified sampler comprises the following steps:

[0019] S1. Install the sampling mechanism. The length of a single extension rod is 1 meter. The number of extension rods is determined according to the sampling depth requirements. The extension rod is connected to the connecting mechanism. The sampling probe is connected to the bottom of the extension rod through the connecting mechanism. A sealing ring is arranged on the outside of the connecting mechanism. The top of the extension rod is inserted into a sealing cone whose inner diameter matches the outer diameter of the extension rod. The sampling probe is inserted into the designated test position so that the lower end face of the sealing cone is below the ground and the upper end face of the sealing cone is above the ground. The sampling probe connected to the sampling body is connected to the top of the extension rod through the sealing cone, and the quick-plug interface is connected to the analyzer.

[0020] S2, take samples, turn on the switch that controls the sampling pump, press the gas medium at the designated point in the soil into the interior of the sampling probe through the small holes evenly distributed on the outer surface of the middle part of the sampling probe, the gas medium enters the first medium transmission hose located inside the sampling body and connected to the sampling probe through the extension rod and the sampling probe, then the gas medium enters the first right-angle elbow located on the outer side of the sampling body and connected to the first medium transmission hose, the gas medium enters the second right-angle elbow located on the outer side of the sampling body through the second medium transmission hose connected to the first right-angle elbow, the gas medium enters the air inlet end of the filter mechanism through the second right-angle thin elbow located on the inner side of the sampling body and connected to the second right-angle elbow.

[0021] S3, removes water and dust from the sampled gas. The sampling medium first passes through the circular hole filter located at the bottom of the filter mechanism through the air inlet end of the filter mechanism. The medium with a diameter larger than the aperture of the circular hole in the gas medium cannot pass through the circular hole filter. The medium with a diameter smaller than the aperture of the circular hole filter in the gas medium passes through the gasket located between the circular hole filter and the linear filter through which the gas can pass and enters the linear filter for filtration again to remove moisture and impurities in the gas medium.

[0022] S4, adjust the flow rate of the gas medium, and the gas medium after removing moisture and impurities enters the third right-angle elbow located on the side of the upper end surface of the filter mechanism and connected to the gas outlet end of the filter mechanism through the gas outlet end of the filter mechanism, and the gas medium enters the gas inlet end of the panel-type adjustable gas flowmeter through the third medium transmission hose connected to the third right-angle elbow. By adjusting the gas flowmeter, the flow rate of the gas medium is controlled at 80L / h. The gas medium after adjusting the flow rate enters the fourth medium transmission hose connected to the gas outlet end of the panel-type adjustable gas flowmeter through the gas outlet end of the panel-type adjustable gas flowmeter, and the gas medium enters the fifth medium transmission hose through the fourth right-angle elbow located on the outside of the sampling body and connected to the fourth transmission medium hose. Then the gas medium enters the fifth right-angle elbow located on the outside of the sampling body and connected to the fifth medium transmission hose, and enters the sixth medium transmission hose with a quick-plug interface at the end connected to the fifth right-angle elbow through the fifth right-angle elbow. The sampled gas medium is connected to the analyzer through the quick-plug interface at the tail end of the sixth medium hose.

[0023] S5, sampling is completed, turn off the switch controlling the sampling pump, disconnect the quick-connect interface and the analyzer, disconnect the sampling probe rod and the extension rod, and pull the extension rod and the sampling probe out of the designated detection point.

[0024] A soil gas stratified sampler well washing method, applied to the well washing method of the sampler, comprises the following steps:

[0025] S1. Install the well washing mechanism. The length of a single extension rod is 1 meter. The number of extension rods is determined according to the sampling depth requirements. The extension rod is connected to the connecting mechanism. The sampling probe is connected to the bottom of the extension rod through the connecting mechanism. A sealing ring is arranged on the outside of the connecting mechanism. The top of the extension rod is inserted into a sealing cone whose inner diameter matches the outer diameter of the extension rod. The sampling probe is inserted into the designated position to be tested so that the lower end face of the sealing cone is below the ground and the upper end face of the sealing cone is above the ground. The sampling probe connected to the sampling body is connected to the top of the extension rod through the sealing cone. A rubber plug for inserting a disposable syringe is arranged on the end face of the sampling device on one side of the sampling probe.

[0026] S2, wash the well, insert the sampling device into the wellbore, suck the well-washing medium into the disposable syringe, and inject it into the wellbore through the rubber stopper.

[0027] S3, well washing is completed, the connection between the sampling probe rod and the extension rod is disconnected, and the extension rod and the sampling probe are pulled out from the designated detection point.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] ① The present invention can realize layered sampling by providing an extension rod and a connecting mechanism, and the sampling depth is not limited by the length of the instrument itself.

[0030] ② The present invention can inject the well-washing medium through the sampling device by setting up the sampling device, and carry the medium in the wellbore to the ground through the sampling device, thereby changing the medium properties in the wellbore to meet the requirements of the well-washing operation. The device can also be used to measure the VOC concentration at different times and depths for multiple times, and the measurement data can be entered into the analyzer to determine the optimal sampling time for VOC.

[0031] ③ The sealing head of the sampling device of the present invention can be set as an adsorption tube sleeve with an adsorption tube inside or a rubber plug that can be inserted into a disposable syringe. Sampling from this place can realize clustered (adsorption tube) and non-clustered (head space bottle) sampling.

[0032] ④ Compared with the prior art, the present invention has simple operation, diverse functions, readily available raw materials, low price, and can be operated by only one person, so it is very suitable for promotion and use.

[0033] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a front view of the sampler disclosed in the present invention;

[0035] Figure 2 A top view of the sampler disclosed in the present invention;

[0036] Figure 3 It is a partial enlarged view of the sampler filtering mechanism disclosed in the present invention;

[0037] Figure 4 The sampling flow chart of the sampler disclosed in the present invention;

[0038] Figure 5 This is a flow chart of well washing of the sampler disclosed in the present invention;

[0039] Figure markings: 1-sampling body, 2-sampling probe, 3-first medium transmission hose, 4-first right-angle elbow, 5-panel-type adjustable gas flowmeter, 6-sixth medium transmission hose, 7-second right-angle elbow, 8-second medium transmission hose, 9-fourth medium transmission hose, 10-fifth right-angle elbow, 11-head, 12-linear filter, 13-gasket, 14-round hole filter, 15-filter mechanism, 16-quick plug interface, 17-second right-angle thin elbow, 18-analyzer, 19-sampling probe, 20-connecting mechanism, 21-extension rod, 22-sealing cone, 23-sampling device, 24-sampling pump, 25-sealing ring, 26-fifth medium transmission hose, 27-fourth right-angle elbow, 28-hole, 29-third right-angle elbow, 30-third medium transmission hose, 31-panel-type adjustable gas flowmeter outlet, 32-panel-type adjustable gas flowmeter inlet. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0041] Reference Figures 1 to 3 The soil gas stratified sampler described in this embodiment includes a sampling mechanism, which is composed of a sampling body 1, a sampling probe 2, a sampling probe 19, a plurality of connecting mechanisms 20, and an extension rod 21 twice the number of the connecting mechanisms 20, and is used to perform stratified sampling of soil and determine the optimal sampling time;

[0042] The well-washing mechanism is used to inject the well-washing medium from the sampling device 23, carry the medium in the wellbore to the surface, and thus change the properties of the medium in the wellbore to meet the operation requirements;

[0043] The filtering mechanism 15 is arranged at one side of the sampling body 1, and is used to filter the sampled medium and transport the filtered medium to the analyzer 18 for analysis and processing;

[0044] The medium transmission hose is arranged between the sampling mechanism and the filtering mechanism 15 and is used for transmitting the acquired medium.

[0045] Preferably, the outer end surface of the sampling body 1 is hingedly connected with a first right-angle elbow 4, a second right-angle elbow 7, a third right-angle elbow 29, a fourth right-angle elbow 27 and a fifth right-angle elbow 10, one end of the first medium transmission hose 3 is connected to the sampling probe 2 located at the bottom of the sampling body 1 by a sleeve, the other end of the first medium transmission hose 3 is connected to one end of the first right-angle elbow 4 located on one side of the outside of the sampling body 1 by a sleeve, the other end of the first right-angle elbow 4 is connected to one end of the second right-angle elbow 7 by a second medium transmission hose 8. A second right-angled thin elbow 17 corresponding to the second right-angled thin elbow 7 is provided on one side of the interior of the sampling body 1, one end of the second right-angled thin elbow 17 is pressed into the second right-angled thin elbow 7, and the other end of the second right-angled thin elbow 17 is pressed into the air inlet end of the filtering mechanism 15, and the third right-angled elbow 29 is located on the upper end surface of the filtering mechanism 15 and is connected to the air outlet end of the filtering mechanism 15. A panel-type adjustable gas flow meter 5 is provided on one side of the interior of the sampling body 1 away from the second right-angled thin elbow 17, and the panel-type adjustable gas flow meter 5 can be controlled according to the sampling requirements. The gas flow rate is controlled by controlling the gas pressure. One end of the third medium transmission hose 30 is connected to the third right-angle elbow 29 by a ferrule, and the other end of the third medium transmission hose is connected to the inlet end 32 of the panel-type adjustable gas flow meter by a ferrule. One end of the fourth medium transmission hose 9 is connected to the outlet end 31 of the panel-type adjustable gas flow meter by a ferrule, and the other end of the fourth medium transmission hose 9 is connected to the fourth right-angle elbow 27 located on the outer side of the sampling body 1 by a ferrule. One end of the fifth medium transmission hose 26 is connected to the fourth One end of the right-angle elbow 27 is connected by a ferrule, the other end of the fifth medium transmission hose 26 is connected to the fifth right-angle elbow 10 located on the outside of the sampling body, one end of the sixth medium transmission hose 6 is connected to the fifth right-angle elbow 10, and the other end of the sixth medium transmission hose 6 is provided with a quick-plug interface 16, which is connected to the gas analyzer 18 and can also be connected to other portable analyzers. The gas analyzer 18 is provided with a sampling pump 24 that provides power for the sampler, and the outer end face of the analyzer 18 is provided with a switch for controlling the sampling pump 24.

[0046] Preferably, the first right-angle elbow 4 , the second right-angle elbow 7 , the third right-angle elbow 29 , the fourth right-angle elbow 27 and the fifth right-angle elbow 10 are all hinged right-angle elbows, and the second right-angle elbow 7 is a PP right-angle elbow with the same inner diameter as the second right-angle thin elbow 17 .

[0047] Preferably, the sampling probe 2 provided at the bottom of the sampling body 1 and connected to the first medium transmission hose 3 by a ferrule is a hollow tubular structure, and a sampling device 23 is brazed on one side of the sampling probe 2, and the sampling device 23 is connected to the upper end of the sampling probe 2 at a 45° angle, and a sealing head 11 is provided at the end of the sampling device 23, and the sealing head 11 is used to seal the sampling device 23, and the sampling device 23 is used to inject the well-washing medium into the sampling well / hole through the sampling probe 2, wherein the sampling device 23 can be connected to the rubber plug of the built-in VOC adsorption tube sleeve or disposable syringe, and the well-washing medium can be injected from the sampling device 23 by setting the sampling device 23, and the medium in the wellbore is carried to the ground through the sampling device 23, thereby changing the medium properties in the wellbore to meet the requirements of the well-washing operation. The device can also be used to measure the VOC concentration at different times and depths for multiple times, and the optimal sampling time of VOC can be determined by entering the measurement data into the analyzer.

[0048] Preferably, a sealing cone 22 is connected to the bottom of the sampling probe 2. The sealing cone 22 can prevent gas in the air from entering the sampler. An extension rod 21 is connected to the bottom of the sealing cone 22, wherein a connecting mechanism 20 is provided between any two of the extension rods 21 for connecting the two extension rods 21. The connecting mechanism 20 and the extension rods 21 are threadedly connected. The length of a single extension rod 21 is 1 meter. A sealing ring 25 is provided outside the connecting mechanism 20 for sealing the connecting gap between the extension rod 21 and the connecting mechanism 20. The sealing ring is made of any one of silicone rubber, butyl rubber, nitrile rubber, and EPDM rubber. By providing the extension rod 21 and the connecting mechanism 20, layered sampling can be achieved, and the sampling depth can be prevented from being limited by the length of the instrument itself.

[0049] Preferably, the bottom end of the extension rod 21 is connected to a sampling probe 19 through a connecting mechanism 20, and the connecting mechanism 20 and the sampling probe 19 are threadedly connected. A sealing ring 25 is arranged outside the connecting mechanism 20 and the sampling probe 19 to seal the connecting gap between the extension rod 21 and the sampling probe 19. By setting the sealing ring 25, the gas medium outside the test point in the sampling well / hole can be prevented from entering the extension rod 21. The bottom of the sampling probe is an inverted cone, the diameter of the middle part of the sampling probe 19 is smaller than the diameter of the two end parts of the sampling probe 19, and the outer surface of the middle part of the sampling probe 19 is provided with evenly distributed small holes 28.

[0050] Preferably, the panel-type adjustable gas flow meter 5 controls the flow rate at 80 L / h, and controls the gas pressure by controlling the gas flow entering the sampling body 1 .

[0051] Preferably, the filtering mechanism 15 is composed of a linear filter 12, a gasket 13 and a circular hole filter 14 from top to bottom. The circular hole filter 14 is a polytetrafluoroethylene microporous membrane filter with a pore size of 0.2 μm. The gasket 13 is allowed to pass through by gas and is arranged in the middle of the linear filter 12 and the circular hole filter 14 to increase the contact area between the two. The inner surface of the air outlet end of the filtering mechanism 15 is provided with a thread matching the third right-angle elbow 29. The air outlet end of the filtering mechanism 15 is threadedly connected to the third right-angle elbow 29. The obtained gas medium is sequentially passed through the linear filter 12 for dust removal and the circular hole filter 14 for water removal.

[0052] As another solution of the present invention, a sampling method of a soil gas stratified sampler is also provided, comprising the following steps:

[0053] S1. Install the sampling mechanism. The length of a single extension rod 21 is 1 meter. The number of extension rods 21 is determined according to the sampling depth requirements. The extension rod 21 is threadedly connected to the connecting mechanism 20. The sampling probe 19 is threadedly connected to the extension rod 21 through the connecting mechanism 20. The sampling probe 19 is located at the bottom of the extension rod 21. A sealing ring 25 is arranged outside the connecting mechanism 20. The top of the extension rod 21 is inserted into a sealing cone 22 whose inner diameter matches the outer diameter of the extension rod. The sampling probe 19 is inserted into a designated test position so that the lower end face of the sealing cone 22 is located below the ground and the upper end face of the sealing cone 22 is located above the ground to prevent gas in the air from entering the sampling probe 2. The sampling probe 2 connected to the sampling body 1 is connected to the top of the extension rod 21 through the sealing cone 22, and the quick-plug interface 16 is connected to the analyzer 18.

[0054] S2, sampling is carried out, the switch controlling the sampling pump 24 is turned on, and the gas medium at the designated point in the soil is pressed into the sampling probe 19 through the small holes 28 evenly distributed on the outer surface of the middle part of the sampling probe 19, and the gas medium enters the first medium transmission hose 3 located inside the sampling body 1 and connected to the sampling probe 2 with a sleeve through the extension rod 21 and the sampling probe 2, and then the gas medium enters the first right-angle elbow 4 located on the outer side of the sampling body 1 and connected to the first medium transmission hose 3 with a sleeve, and the gas medium enters the second right-angle elbow 7 located on the outer side of the sampling body 1 through the second medium transmission hose 8 connected to the first right-angle elbow 4 with a sleeve, and the gas medium enters the air inlet end of the filtering mechanism 15 through the second right-angle thin elbow 17 located on the inner side of the sampling body 1 and corresponding to the second right-angle elbow 7.

[0055] S3, removes water and dust from the sampled gas. The sampled medium first passes through the circular hole filter 14 located at the bottom of the filter mechanism 15 through the air inlet end of the filter mechanism 15. The medium with a diameter larger than the aperture of the circular hole in the gas medium cannot pass through the circular hole filter 14. The medium with a diameter smaller than the aperture of the circular hole filter 14 in the gas medium can pass through the gasket 13 located between the circular hole filter 14 and the linear filter 12 to enter the linear filter 12 for filtering again, thereby removing moisture and impurities in the gas medium.

[0056] S4, adjust the flow rate of the gas medium, the gas medium after removing moisture and impurities enters the third right-angle elbow 29 located on one side of the upper end face of the filter mechanism 15 and communicates with the gas outlet end of the filter mechanism 15 through the gas outlet end of the filter mechanism 15, the gas medium enters the panel-type adjustable gas flow meter inlet end 32 through the third medium transmission hose 30 connected to the third right-angle elbow 29, adjust the gas flow meter 5, control the flow rate of the gas medium at 80L / h, and the gas medium after adjusting the flow rate enters the panel-type adjustable gas flow meter through the gas outlet end 31 The gas medium enters the fifth medium transmission hose 26 through the fourth right-angle elbow 27 located on the outside of the sampling body 1 and connected to the fourth medium transmission hose 9, and enters the sixth medium transmission hose 6 connected to the fifth right-angle elbow 10 with a ferrule through the fifth right-angle elbow 10 located on the outside of the sampling body 1 and connected to the fifth medium transmission hose 26. The sampled gas medium is connected to the analyzer 18 through the quick-plug interface 16 located at the tail end of the sixth medium transmission hose 6.

[0057] S5, sampling is completed, the switch controlling the sampling pump 24 is turned off, the connection between the quick-connect interface 16 and the analyzer 18 is disconnected, the connection between the sampling probe rod 2 and the extension rod 21 is disconnected, and the extension rod 21 and the sampling probe 19 are pulled out from the designated detection point.

[0058] As another solution of the present invention, a well washing method for a soil gas stratified sampler is also provided, comprising the following steps:

[0059] S1, install the well washing mechanism, the length of a single extension rod 21 is 1 meter, and the number of extension rods 21 is determined according to the sampling depth requirements. The extension rod 21 is connected to the connecting mechanism 20 by threads, and the sampling probe 19 is connected to the extension rod 21 by threads through the connecting mechanism 20. The sampling probe 19 is located at the bottom of the extension rod 21, and a sealing ring 25 is arranged outside the connecting mechanism 20. The top of the extension rod 21 is inserted into a sealing cone 22 whose inner diameter matches the outer diameter of the extension rod. The sampling probe 19 is inserted into the designated position to be measured, so that the lower end face of the sealing cone 22 is located below the ground, and the upper end face of the sealing cone 22 is located above the ground to prevent gas in the air from entering the sampling probe 2. The sampling probe 2 connected to the sampling body 1 is connected to the top of the extension rod 21 through the sealing cone 22, and a rubber plug for inserting a disposable syringe is arranged on the end face of the sampling device 23 located on one side of the sampling probe 2.

[0060] S2, for well washing, insert the sampling device into the wellbore, suck the well washing medium into the disposable syringe, and inject it into the wellbore through the rubber stopper for well washing.

[0061] S3, the well washing is completed, the connection between the sampling probe rod 2 and the extension rod 21 is disconnected, and the extension rod 21 and the sampling probe 19 are pulled out from the designated detection point.

[0062] The working principle of the present invention is as follows: when sampling, the number of extension rods 21 is determined according to the depth of the sampling point from the ground. Different numbers of extension rods 21 are connected to meet the needs of sampling points of different depths of the sampler. After the number of extension rods 21 is determined, the extension rods 21 are connected to the extension rods 21 through the connecting mechanism 20, and the sampling probe 19 is connected to the extension rod 21 through the connecting mechanism 20. Sealing rings 25 are installed at the connecting gaps between the sampling probe 19 and the connecting mechanism 20 and at the connecting gaps between the extension rod 21 and the connecting mechanism 20 to prevent the gas in the sampling well / hole other than the sampling point from entering the extension rod 21. The end of the extension rod 21 away from the sampling probe 19 is inserted into the sealing cone 22, and the sampling probe 19 is inserted into the designated position to be tested, so that the sealing cone 25 is installed. 2 is located below the ground, and the upper end surface of the sealing cone 22 is located above the ground to prevent gas in the air from entering the extension rod 21. The sampling probe 2 connected to the sampling body 1 is connected to the end of the extension rod 21 away from the sampler 19 through the sealing cone 22. A rubber plug for inserting a disposable syringe is provided on the end surface of the sampling device 23 located on one side of the sampling probe 2. The quick-insertion interface 16 connected to the sampling body 1 is connected to the analyzer 18 with a sampling pump 24 installed therein. The well washing medium is sucked into the disposable syringe and injected into the wellbore through the rubber plug for washing the well. The switch controlling the sampling pump 24 is turned on, and the gas medium at the point to be measured is pressed into the interior of the sampling probe 19 through the small hole on the outer surface of the middle part of the sampling probe 19. The gas medium passes through the extension rod 21 and the sampling probe 19. The probe rod 2 enters the first medium transmission hose 3, and then the gas passes through the first medium transmission hose 3, the first right-angle elbow 4, the second medium transmission hose 8, the second right-angle elbow 7, and the second right-angle thin elbow 17 to enter the filter mechanism 15. The gas medium passes through the inlet end of the filter mechanism 15 and first passes through the circular hole filter 14 located at the bottom of the filter mechanism 15. The medium with a diameter larger than the aperture of the circular hole in the gas medium cannot pass through the circular hole filter 14. The medium with a diameter smaller than the aperture of the circular hole filter 14 in the gas medium can pass through the gasket 13 located between the circular hole filter 14 and the linear filter 12 to enter the linear filter 12 for filtering again. The moisture and impurities in the gas medium are removed by the circular hole filter 14 and the linear filter 12, and the water is removed. The gas medium after separation and impurities passes through the outlet end of the filter mechanism 15, passes through the third right-angle elbow 29, the third medium transmission hose 30, and the panel-type adjustable gas flow meter inlet end 32 in turn. After the gas enters the gas flow meter 5, the gas flow meter 5 is adjusted. By controlling the gas flow and controlling the gas pressure, the different flow rate requirements of different analyzers for the sampled gas can be met. The gas medium after adjusting the flow rate passes through the outlet end 31 of the panel-type adjustable gas flow meter, passes through the fourth medium transmission hose 9, the fourth right-angle elbow 27, the fifth medium transmission hose 26, the fifth right-angle elbow 10 and the sixth medium transmission hose 6 in turn. The sampled gas medium is connected to the analyzer 18 through the quick-plug interface 16 at the tail end of the sixth medium transmission hose 6. After the sampling is completed,Turn off the switch controlling the sampling pump 24, disconnect the quick-insert interface 16 from the analyzer 18, disconnect the sampling probe rod 2 from the extension rod 21, and pull out the extension rod 21 and the sampling probe 19 from the designated detection point. The present invention is simple to operate, has multiple functions, is easy to obtain raw materials, is inexpensive, and can be operated by only one person, making it very suitable for promotion and use.

[0063] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A soil gas stratified sampler, characterized in that: include The sampling mechanism is composed of a sampling body (1), a sampling probe (2), a sampling probe head (19), a plurality of connecting mechanisms (20), and extension rods (21) twice the number of the connecting mechanisms (20), and is used for stratified sampling of soil and determining an optimal sampling time; The well-washing mechanism is used to inject the well-washing medium from the sampling device (23) to carry the medium in the wellbore to the surface, thereby changing the properties of the medium in the wellbore to meet the operation requirements; A filtering mechanism (15) is arranged on one side of the sampling body (1) and is used to filter the sampled medium and transport the filtered medium to an analyzer (18) for analysis; A medium transmission hose, arranged between the sampling mechanism and the filtering mechanism (15), and used for transmitting the acquired medium; The outer end surface of the sampling body (1) is respectively provided with a first right-angle elbow (4), a second right-angle elbow (7), a third right-angle elbow (29), a fourth right-angle elbow (27) and a fifth right-angle elbow (10); one end of a first medium transmission hose (3) is connected to a sampling probe (2) located at the bottom of the sampling body (1); the other end of the first medium transmission hose (3) is connected to one end of the first right-angle elbow (4) located on one side of the outside of the sampling body (1); the other end of the first right-angle elbow (4) is connected to one end of the second right-angle elbow (7) via a second medium transmission hose (3). A second right-angled thin elbow (17) corresponding to the second right-angled thin elbow (7) is arranged on one side of the interior of the sampling body (1), wherein one end of the second right-angled thin elbow (17) is pressed into the second right-angled thin elbow (7), and the other end of the second right-angled thin elbow (17) is pressed into the air inlet end of the filtering mechanism (15), the third right-angled elbow (29) is located directly above the filtering mechanism (15) and is connected to the air outlet end of the filtering mechanism (15), and a panel-type The adjustable gas flow meter (5) comprises a third medium transmission hose (30) having one end in communication with the third right-angle elbow (29), the other end of the third medium transmission hose (30) in communication with the gas inlet end (32) of the panel-type adjustable gas flow meter, a fourth medium transmission hose (9) having one end in communication with the gas outlet end (31) of the panel-type adjustable gas flow meter, the other end of the fourth medium transmission hose (9) in communication with the fourth right-angle elbow (27) located on one side of the outside of the sampling body (1), and a fifth medium transmission hose (26) having one end in communication with the fourth right-angle elbow (27). ), the other end of the fifth medium transmission hose (26) is connected to the fifth right-angle elbow (10) located on the outer side of the sampling body (1), one end of the sixth medium transmission hose (6) is connected to the fifth right-angle elbow (10), the other end of the sixth medium transmission hose (6) is provided with a quick-connect interface (16), the quick-connect interface (16) is connected to the gas analyzer (18), the gas analyzer (18) is provided with a sampling pump (24) for providing power to the sampler, and the outer end surface of the gas analyzer (18) is provided with a switch for controlling the sampling pump (24); The sampling probe (2) arranged at the bottom end of the sampling body (1) is a hollow tubular structure, and a sealing head (11) is provided at the end of the sampling device (23) arranged on one side of the sampling probe (2). The sampling device (23) is connected to the sampling probe (2) in an oblique manner. The sampling device (23) is used to inject a well-washing medium into the sampling well / hole through the sampling probe (2), wherein the sampling device (23) can be connected to a built-in VOC adsorption tube sleeve or a rubber plug head for inserting a disposable syringe; A sealing cone (22) is connected to the bottom of the sampling probe (2), and an extension rod (21) is arranged at the bottom of the sealing cone (22), wherein a connecting mechanism (20) is arranged between any two of the extension rods (21), and the connecting mechanism (20) is used to connect two adjacent extension rods (21), and the length of a single extension rod (21) is 1 meter. A sealing ring (25) is arranged outside the connecting mechanism (20), and the sealing ring (25) is used to seal the connection gap between the extension rod (21) and the connecting mechanism (20), and the material of the sealing ring (25) is any one of silicone rubber, butyl rubber, nitrile rubber, and EPDM rubber; The bottom end of the extension rod (21) is connected to a sampling probe (19) via a connecting mechanism (20), a sealing ring (25) is provided outside the connecting mechanism (20) and the sampling probe (19), the bottom of the sampling probe (19) is in an inverted cone shape, the diameter of the middle portion of the sampling probe (19) is smaller than the diameter of the two end portions of the sampling probe (19), and the outer surface of the middle portion of the sampling probe (19) is provided with evenly distributed small holes (28).

2. A soil gas stratified sampler according to claim 1, characterized in that: The first right-angle elbow (4), the second right-angle elbow (7), the third right-angle elbow (29), the fourth right-angle elbow (27) and the fifth right-angle elbow (10) are all hinged right-angle elbows, and the second right-angle thin elbow (17) is a PP right-angle elbow having the same inner diameter as the second right-angle elbow (7).

3. A soil gas stratified sampler according to claim 1, characterized in that: The filtering mechanism (15) is composed of a linear filter (12), a gasket (13) and a circular filter (14) from top to bottom. The gasket (13) allows gas to pass through, and the gasket (13) is arranged between the linear filter (12) and the circular filter (14) to increase the contact area between the two. The inner surface of the air outlet end of the filtering mechanism (15) is provided with a thread matching the third right-angle elbow (29). The air outlet end of the filtering mechanism (15) is threadedly connected to the third right-angle elbow (29), and the obtained medium is filtered through the linear filter (12) and the circular filter (14) in sequence.

4. A soil gas stratified sampler according to claim 3, characterized in that: The circular pore filter (14) is a polytetrafluoroethylene microporous membrane filter with a pore size of 0.2 μm.

5. A soil gas stratified sampling method, using the sampling method of the sampler according to any one of claims 1 to 4, characterized in that: The steps are as follows: S1, installing a sampling mechanism, wherein the length of a single extension rod (21) is 1 meter, and the number of extension rods (21) is determined according to the sampling depth requirement, the extension rod (21) is connected to the connection mechanism (20), the sampling probe (19) is connected to the bottom of the extension rod (21) through the connection mechanism (20), a sealing ring (25) is arranged outside the connection mechanism (20), the top of the extension rod (21) is inserted into a sealing cone (22) whose inner diameter matches the outer diameter of the extension rod, the sampling probe (19) is inserted into a designated position to be tested, the lower end surface of the sealing cone (22) is located below the ground, and the upper end surface of the sealing cone (22) is located above the ground, the sampling probe (2) connected to the sampling body (1) is connected to the top of the extension rod (21) through the sealing cone (22), and the quick-plug interface (16) is connected to the analyzer (18); S2, sampling is performed, the switch for controlling the sampling pump (24) is turned on, and the gas medium at the designated point in the soil is pressed into the interior of the sampling probe (19) through the small holes (28) evenly distributed on the outer surface of the middle part of the sampling probe (19), and the gas medium enters the first medium transmission hose (3) located inside the sampling body (1) and connected to the sampling probe (2) through the extension rod (21) and the sampling probe (2), and then the gas medium enters the first right-angle elbow (4) located on the outer side of the sampling body (1) and connected to the first medium transmission hose (3), and the gas medium enters the second right-angle elbow (7) located on the outer side of the sampling body (1) through the second medium transmission hose (8) connected to the first right-angle elbow (4), and the gas medium enters the air inlet end of the filter mechanism (15) through the second right-angle thin elbow (17) located on the inner side of the sampling body (1) and connected to the second right-angle elbow (7); S3, removing water and dust from the sampled gas, the sampled medium first passes through the circular hole filter (14) located at the bottom of the filter mechanism (15) through the air inlet end of the filter mechanism (15), the medium with a diameter larger than the aperture of the circular hole in the gas medium cannot pass through the circular hole filter (14), and the medium with a diameter smaller than the aperture of the circular hole filter (14) in the gas medium can pass through the gasket (13) located between the circular hole filter (14) and the linear filter (12) to enter the linear filter (12) for filtering again, thereby removing moisture and impurities in the gas medium; S4, adjusting the flow rate of the gas medium, the gas medium after removing moisture and impurities enters the third right-angle elbow (29) located on one side of the outer end surface of the filter mechanism (15) and connected to the gas outlet end of the filter mechanism (15) through the gas outlet end of the filter mechanism (15), the gas medium enters the gas inlet end (32) of the panel-type adjustable gas flow meter through the third medium transmission hose (30) connected to the third right-angle elbow (29), and the flow rate of the gas medium is controlled at 80L / h by adjusting the gas flow meter (5). The gas medium after adjusting the flow rate enters the fourth medium transmission hose (9) connected to the gas outlet end (31) of the panel-type adjustable gas flow meter through the gas outlet end (31) of the panel-type adjustable gas flow meter, the gas medium enters the fifth medium transmission hose (26) through the fourth right-angle elbow (27) located on the outer side of the sampling body (1) and connected to the fourth medium transmission hose (9), and the sampled gas medium is connected to the analyzer (18) through the quick-connect interface (16) located at the rear end of the fifth medium transmission hose (26); S5, sampling is completed, the switch controlling the sampling pump (24) is turned off, the connection between the quick-connect interface (16) and the analyzer (18) is disconnected, the connection between the sampling probe rod (2) and the extension rod (21) is disconnected, and the extension rod (21) and the sampling probe (19) are pulled out from the designated detection point.

6. A method for washing a soil gas stratified sampler, using the method for washing a soil gas stratified sampler as claimed in claim 2, characterized in that: The steps are as follows: S1, installing a well washing mechanism, wherein the length of a single extension rod (21) is 1 meter, and the number of extension rods (21) is determined according to the sampling depth requirement, the extension rod (21) is connected to the connection mechanism (20), the sampling probe (19) is connected to the bottom of the extension rod (21) through the connection mechanism (20), a sealing ring (25) is arranged outside the connection mechanism (20), the top of the extension rod (21) is inserted into a sealing cone (22) whose inner diameter matches the outer diameter of the extension rod, the sampling probe (19) is inserted into a designated position to be tested, the lower end surface of the sealing cone (22) is located below the ground, and the upper end surface of the sealing cone (22) is located above the ground, the sampling probe (2) connected to the sampling body (1) is connected to the top of the extension rod (21) through the sealing cone (22), and a rubber plug for inserting a disposable syringe is arranged on the end surface of the sampling device (23) located on one side of the sampling probe (2); S2, wash the well, insert the sampling device into the wellbore, suck the well-washing medium into the disposable syringe, and inject it into the wellbore through the rubber stopper to wash the well; S3, the well washing is completed, the connection between the sampling probe rod (2) and the extension rod (21) is disconnected, and the extension rod (21) and the sampling probe (19) are pulled out from the designated detection point.

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