Soil gas collecting device

Abstract

The utility model relates to the technical field of soil gas collecting devices, and particularly discloses a soil gas collecting device which comprises a support, a collecting module for collecting gas in soil is arranged on the support, a switching module for switching the on-off state and the flow direction of a gas path is arranged in the collecting module, and the switching module regulates and controls the gas path state of the collecting module. When the sampling device is used, the valve core in the switching module is accurately matched with the airtight valve, and a sealing ring is matched to enhance the sealing performance, so that the flow path crosstalk of high-concentration waste gas in a well washing stage can be effectively blocked, the waste gas is prevented from being mixed into a final sample, soil gas is guided to naturally flow to complete sampling by virtue of preset negative pressure of a pipeline, and continuous driving of a pump body is not needed; the stable state of airflow in the sampling process can be always maintained, so that the original composition of the volatile organic compounds is maintained, and the sampling accuracy is guaranteed.

Description

Technical Field

[0001] This utility model relates to the technical field of soil gas collection devices, specifically a soil gas collection device. Background Technology

[0002] In the fields of environmental monitoring, soil pollution investigation, and ecological research, the analysis of volatile organic compounds (VOCs), greenhouse gases, and other components in soil gas is crucial. The data directly provides core evidence for soil pollution status assessment, pollution source tracing, and ecosystem carbon cycle research. To obtain gas samples from soil pores at different depths, existing soil gas sampling equipment is widely used to collect representative soil gas samples and stably transmit them to subsequent laboratory testing equipment to achieve accurate analysis of the content and composition of target components in the soil gas.

[0003] In practical applications of traditional active soil gas sampling methods, the high-concentration exhaust gas emitted during the well washing stage can be mixed into the final laboratory samples due to crosstalk in the valve body flow path. Furthermore, the pulses and vibrations generated by the continuously running vacuum pump during sampling can disturb the airflow and affect the original composition of volatile organic compounds. Therefore, we propose a soil gas sampling device. Utility Model Content

[0004] The purpose of this invention is to provide a soil gas collection device to solve the problems mentioned in the background art, such as the high concentration of waste gas during the well washing stage being mixed into the final sample sent to the laboratory due to crosstalk in the valve body flow path, and the pulses and vibrations generated by the continuously running vacuum pump during sampling disturbing the airflow and affecting the original composition of volatile organic compounds.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a soil gas collection device, comprising: a support frame, a collection module for collecting gases in the soil mounted on the support frame, and a switching module for switching the on / off state and flow direction of the gas path inside the collection module, the switching module regulating the gas path state of the collection module;

[0006] The acquisition module includes a vacuum pump fixedly connected to a bracket, a well washing port fixedly connected to the vacuum pump, an airtight valve fixedly connected to the well washing port, a common port fixedly connected to the airtight valve, a gas guide tube fixedly connected to the common port, a soil gas probe fixedly connected to the gas guide tube, a sampling port fixedly connected to the airtight valve, and an exhaust gas outlet fixedly connected to the vacuum pump.

[0007] The switching module includes a connecting frame fixedly connected to a bracket. A drive motor is fixedly connected to the connecting frame. A control shaft is fixedly connected to the drive motor. An adjustment knob is fixedly connected to the control shaft. A valve core control shaft is fixedly connected to the drive motor. The connecting frame has a reserved hole. A valve core is fixedly connected to the valve core through the reserved hole. The valve core is located inside an airtight valve. The airtight valve is fixedly connected to the connecting frame. A bottom through hole is opened at the bottom of the valve core. A conversion hole is opened on the side of the valve core. The conversion hole and the bottom through hole are interconnected.

[0008] The airtight valve has a sealing ring at the contact point with the valve core.

[0009] The connecting parts of the connecting frame are equipped with locking bolts.

[0010] The outer surface of the adjustment knob is textured with anti-slip grooves.

[0011] The connection between the air duct and the common port, as well as the soil gas probe, all adopt a sealed structure.

[0012] The exhaust gas outlet is positioned away from the sampling area.

[0013] The mating surfaces of the valve core control shaft and the reserved hole are kept flat and smooth.

[0014] The sealing ring is fitted around the outer circumference of the valve core and fits tightly against the inner wall of the airtight valve.

[0015] This utility model has at least the following beneficial effects:

[0016] In use, this invention, through the precise cooperation between the valve core and the airtight valve in the switching module, and the sealing ring to enhance the sealing performance, can effectively block the crosstalk of high-concentration waste gas during the well washing stage, preventing it from mixing into the final sample. It relies on the preset negative pressure in the pipeline to guide the natural flow of soil gas to complete the sampling, without the need for continuous pump drive. It can always maintain the stable state of the airflow during the sampling process, reduce the disturbance to the airflow, thereby maintaining the original composition of volatile organic compounds and ensuring the accuracy of sampling. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the data acquisition module of this utility model;

[0019] Figure 3 This is a schematic diagram of the switching module of this utility model;

[0020] Figure 4 This is a schematic diagram of the internal structure of the switching module of this utility model;

[0021] Figure 5This is a partially enlarged schematic diagram of the switching module of this utility model.

[0022] In the diagram: 1. Support; 2. Acquisition module; 21. Soil gas probe; 22. Gas guide pipe; 23. Airtight valve; 24. Common port; 25. Well washing port; 26. Vacuum pump; 27. Exhaust gas outlet; 28. Sampling port; 3. Switching module; 31. Adjustment knob; 32. Control shaft; 33. Drive motor; 34. Valve core control shaft; 35. Valve core; 36. Connecting frame; 37. Reserved hole; 38. Bottom through hole; 39. Conversion hole; 4. Sealing ring; 5. Locking bolt; 6. Anti-slip texture. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1

[0025] Please see Figures 1 to 5 This utility model provides a technical solution: a soil gas collection device, comprising: a support 1, which can be stably placed on a flat ground in the soil sampling area, providing a stable support and installation foundation for all components of the device, ensuring that the device will not be displaced due to external forces or vibrations generated during operation; a collection module 2 for collecting gases from the soil is provided on the support 1, which is specifically used to extract gases from different depths and locations in the soil, and to perform preliminary transmission and diversion of the extracted gases, providing a gas flow path for subsequent well washing, sampling and other operations; a switching module 3 is provided inside the collection module 2 to switch the gas path on / off and flow direction, which precisely controls the gas path state of the collection module 2 through its own mechanical action, so that the gas path can be smoothly switched between different working stages according to actual working needs, to adapt to different working scenarios such as well washing, sampling, and exhaust, and to ensure that the entire gas collection process can be carried out in an orderly and efficient manner.

[0026] The acquisition module 2 includes a vacuum pump 26 fixedly connected to the bracket 1. The vacuum pump 26 serves as one of the power sources for the device, providing necessary power support for the flow of gas in the gas path. The vacuum pump 26 is fixedly connected to a well-washing port 25, which is a key interface for gas circulation and return during the well-washing stage, used to achieve reciprocating flow of gas in the well-washing circuit. The well-washing port 25 is fixedly connected to an airtight valve 23, which is the core component controlling the opening and closing and sealing of the gas path, effectively ensuring the sealing performance of the gas path under different conditions. The airtight valve 23 is fixedly connected to a common port. 24. The common port 24 is the main inlet for soil gas to enter the entire collection device. All gases collected from the soil enter the internal gas path system of the device through this port. A gas guide tube 22 is fixedly connected to the common port 24. The gas guide tube 22 is used to stably transmit the soil gas entering from the common port 24 to the soil gas probe 21, and at the same time, it transmits the gas collected by the soil gas probe 21 back to the common port 24. The gas guide tube 22 is fixedly connected to the soil gas probe 21. The soil gas probe 21 needs to be inserted into the preset sampling position in the soil to directly contact the gas in the soil pores. A gas sample is collected by a contact valve 23. A sampling port 28 is fixedly connected to the gas valve 23. The sampling port 28 is specifically designed to connect to an external sampling container, allowing the processed target gas sample to be introduced into the sampling container for storage. A vacuum pump 26 is fixedly connected to an exhaust gas outlet 27, which is used to discharge high-concentration exhaust gas and other unwanted gases generated during the well-washing process. When performing well-washing, the vacuum pump 26 starts, and the soil gas probe 21 extracts gas from the soil. The gas is transmitted through the gas guide pipe 22 to the common port 24, and then enters the soil from the common port 24. The gas is then returned to the vacuum pump 26 through the well washing port 25 via the airtight valve 23, forming a complete circulation loop to clean the gas path and remove residual impurities and interfering gases. When sampling is performed, the gas collected from the soil enters the airtight valve 23 through the gas guide pipe 22 and the common port 24. Under the control of the switching module 3, the gas is introduced into the pre-connected sampling container through the sampling port 28 to complete the collection of gas samples. The high-concentration waste gas generated during the well washing process is discharged from the device through the waste gas outlet 27 under the action of the vacuum pump 26.

[0027] The switching module 3 includes a connecting frame 36 fixedly connected to the bracket 1. The connecting frame 36 provides a stable mounting base and support structure for each component of the switching module 3, enabling the components to be installed and fixed according to a preset positional relationship. A drive motor 33 is fixedly connected to the connecting frame 36, providing power output for the switching action of the switching module 3. A control shaft 32 is fixedly connected to the drive motor 33, transmitting the power output from the drive motor 33 to the adjustment knob 31. The control shaft 32 also connects the drive motor 33 and the adjustment knob 31. The adjustment knob 31 is fixedly connected to the control shaft 32. This device allows for manual fine-tuning of the drive motor 33 to ensure precise switching. The drive motor 33 is fixedly connected to a valve core control shaft 34, which transmits power from the drive motor 33 to the valve core 35, causing it to rotate. The connecting frame 36 has a pre-drilled hole 37, providing space for the installation and movement of the valve core control shaft 34. This allows the valve core control shaft 34 to pass smoothly through the connecting frame 36 and drive the valve core 35. The valve core control shaft 34 passes through the pre-drilled hole 37 and is fixedly connected to the valve core 35. The valve core 35 is the core component for switching the air path, changing the air path's connectivity through its rotation. In this configuration, valve core 35 is located inside airtight valve 23, which is fixedly connected to connecting frame 36 to ensure stable rotation of valve core 35 within airtight valve 23. A bottom through-hole 38 is provided at the bottom of valve core 35, specifically for docking with common port 24, allowing gas to enter valve core 35 from common port 24. A switching hole 39 is provided on the side of valve core 35, for docking with well washing port 25 or sampling port 28 to switch the gas path. The switching hole 39 and bottom through-hole 38 are interconnected, forming a gas flow channel. When switching the gas path is required, drive motor 33 starts, and the output shaft of drive motor 33 drives... The control shaft 32 and the valve core control shaft 34 rotate simultaneously. The valve core control shaft 34 drives the valve core 35 to rotate inside the airtight valve 23. If the bottom through hole 38 at the bottom of the valve core 35 is aligned with the common port 24, and the conversion hole 39 on the side of the valve core 35 is connected to the well washing port 25, the gas path is switched to the well washing mode. If the conversion hole 39 on the side of the valve core 35 is connected to the sampling port 28, the gas path is switched to the sampling mode. Based on the drive of the drive motor 33, the operator can also manually fine-tune the position of the valve core 35 by rotating the adjustment knob 31 to ensure that the through hole on the valve core 35 can be accurately connected with the corresponding port, so as to realize the reliable switching of the gas path.

[0028] Example 2

[0029] In this second embodiment, the other structures remain unchanged. The difference from the first embodiment is that a sealing ring 4 is provided at the contact position between the airtight valve 23 and the valve core 35. The sealing ring 4 can enhance the sealing performance between the airtight valve 23 and the valve core 35, and further block the crosstalk of the high-concentration waste gas flow path during the well washing stage. A locking bolt 5 is provided at the connection of the connecting frame 36. The locking bolt 5 can strengthen the installation stability of the connecting frame 36. The outer peripheral surface of the adjustment knob 31 is provided with anti-slip texture 6. The anti-slip texture 6 can improve the operating grip of the adjustment knob 31.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A soil gas collection apparatus comprising: Support, characterized in that: the support is equipped with a collection module for collecting gas in the soil, the collection module is internally provided with a switching module for switching the on-off and flow direction of the gas circuit, and the switching module regulates the gas circuit state of the collection module. The collection module comprises a vacuum pump fixedly connected to the support, the vacuum pump is fixedly connected with a well flushing port, the well flushing port is fixedly connected with an airtight valve, the airtight valve is fixedly connected with a common port, the common port is fixedly connected with a gas guide pipe, the gas guide pipe is fixedly connected with a soil gas probe, the airtight valve is fixedly connected with a sampling port, and the vacuum pump is fixedly connected with a waste gas outlet. The switching module comprises a connecting frame fixedly connected to the support, the connecting frame is fixedly connected with a driving motor, the driving motor is fixedly connected with a control shaft, the control shaft is fixedly connected with an adjusting knob, the driving motor is fixedly connected with a valve core control shaft, the connecting frame is provided with a reserved hole, the valve core control shaft passes through the reserved hole and is fixedly connected with a valve core, the valve core is located in the airtight valve, the airtight valve is fixedly connected with the connecting frame, a bottom through hole is formed in the bottom of the valve core, a conversion hole is formed in the side of the valve core, and the conversion hole and the bottom through hole are through.

2. The soil gas collection apparatus of claim 1, wherein: The airtight valve is provided with a sealing ring at the contact position of the valve core.

3. The soil gas collection apparatus of claim 1, wherein: The connecting part of the connecting frame is provided with a locking bolt.

4. The soil gas collection apparatus of claim 1, wherein: The outer circumferential surface of the adjusting knob is provided with an anti-skid pattern.

5. The soil gas collection apparatus of claim 1, wherein: The connecting parts of the gas guide pipe, the common port and the soil gas probe are all sealed.

6. The soil gas collection apparatus of claim 1, wherein: The waste gas outlet is arranged in a direction away from the sampling area.

7. The soil gas collection apparatus of claim 2, wherein: The matching surface of the valve core control shaft and the reserved hole is kept smooth.

8. The soil gas collection apparatus of claim 2, wherein: The sealing ring is sleeved on the outer circumference of the valve core, and the sealing ring is tightly attached to the inner wall of the airtight valve.

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