A spiral sampler and soil gas geochemical measurement device
By setting multiple air inlets and outlets on the drill bit of the spiral sampler and equipping it with a return pipe to achieve gas circulation and reinjection, the problem of air pore blockage is solved, ensuring that the gas circulates in the soil and the instrument, stabilizing the measurement data, and improving the measurement accuracy and sensitivity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DEV RES CENT OF CHINA GEOLOGICAL SURVEY
- Filing Date
- 2025-08-20
- Publication Date
- 2026-07-03
AI Technical Summary
Existing spiral samplers are prone to clogging of their pores when collecting soil gases, causing the gas meter data to change too quickly and making it difficult to accurately obtain the gas content in the soil.
Design a spiral sampler with multiple air inlets and outlets on the drill bit, and equipped with a return pipe to achieve gas circulation and reinjection. Combined with wire to clear blockages, a closed-loop gas path is formed to ensure gas circulation in the soil and instrument.
It stabilized gas measurement data, reduced the probability of pore blockage, extended the service life of the gas pump, and improved the accuracy and sensitivity of measurement data.
Smart Images
Figure CN224456325U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of land gas measurement technology, and more particularly to a spiral sampler for collecting land gas, and a soil gas geochemical measurement device including the spiral sampler. Background Technology
[0002] With the continuous improvement of mineral exploration in my country, the exploration of concealed mineral deposits in covered areas has become an important direction for future development. Soil gas geochemical measurement methods, as one of the most effective geochemical exploration methods for mineral exploration in covered areas, have achieved rapid development in recent years, especially in terms of instruments and equipment, overcoming the technical challenges of low soil gas content and difficulty in sample collection.
[0003] Soil gas geochemical measurement methods measure the gas content in soil and, based on the size and location of gas anomalies, determine the potential locations of mineral deposits, providing geochemical evidence for mineral exploration. In the field of gas geochemical measurement, based on the method of obtaining soil gas samples, it can generally be divided into active sampling methods, passive sampling methods, and laboratory thermal interpretation methods.
[0004] The current method for gas geochemical measurements using active sampling involves extracting gas from the soil using a gas pump and then delivering it to a gas analyzer via a gas delivery tube for analysis. During measurement, the drill bit of a spiral sampler is inserted into the soil, and the gas collected by the spiral sampler is sequentially sent through a silicone tube to a dryer, a filter, and a gas analyzer, which contains a gas pump.
[0005] The current spiral sampler has the following defects in practical applications: 1. The drill bit has 6 air inlets connected to the silicone tube. However, these 6 small holes are often blocked by soil during operation and are difficult to clean in time. Therefore, it is easy to cause the gas measuring instrument to fail to measure data, and in severe cases, it will damage the air pump; 2. The spiral sampler collects a limited amount of gas. The air pump quickly pumps out all the gas in the soil and discharges it into the atmosphere, causing the data of the gas measuring instrument to change too quickly, making it difficult to accurately obtain the gas content in the soil.
[0006] Therefore, the spiral samplers currently used for soil gas measurement still have many shortcomings, and there is an urgent need to propose a new technical solution to solve the problems existing in the current technology. Utility Model Content
[0007] This application provides a spiral sampler and a soil gas geochemical measurement device to solve the problem that the current spiral sampler can only collect a limited amount of gas, which leads to the data of the gas measuring instrument changing too quickly and making it difficult to accurately obtain the gas content in the soil.
[0008] To achieve the above objectives, this application provides the following technical solution:
[0009] In a first aspect, this application provides a spiral sampler, comprising a drill rod, a drill bit connected to one end of the drill rod, a connecting pipe connected to the other end of the drill rod, and a handle connected to the connecting pipe. The drill rod is in the shape of a hollow frustum, and a cutting edge is spirally wound around its outer wall. The drill bit is connected to the small-diameter end of the drill rod and has an inner cavity. Multiple air inlets and multiple air outlets are provided on the side wall of the drill bit. The connecting pipe is provided at the large-diameter end of the drill rod, and the handle is provided at the end of the connecting pipe away from the drill rod. The inner cavity of the drill bit, the cavity of the drill rod, and the cavity of the connecting pipe are sequentially connected. An air inlet pipe connected to the air inlet and a return air pipe connected to the air outlet are provided inside the drill bit. The air inlet pipe and the return air pipe extend outward from the cavity of the connecting pipe. The air inlet pipe is used to transport the collected gas to the air inlet of a gas analyzer, and the return air pipe is used to send the gas discharged from the gas analyzer to the air outlet for discharge.
[0010] Furthermore, in the above technical solution, the drill bit is cylindrical, and the end of the drill bit facing away from the drill rod is provided with a tapered end. The outer diameter of the drill bit is less than or equal to the outer diameter of the small diameter end of the drill rod.
[0011] Furthermore, the plurality of air inlets are evenly arranged on the outer wall of the drill bit, and the plurality of air outlets are evenly arranged on the outer wall of the drill bit.
[0012] Furthermore, the six air inlets are arranged in two rows on the outer wall of the drill bit.
[0013] Furthermore, the handle is a crossbar connected to the end of the connecting pipe, and the connection between the handle and the connecting pipe forms a channel that allows the intake pipe and the return pipe to pass through.
[0014] Furthermore, a section of iron wire is wound around the connecting pipe or handle, and the iron wire can be inserted into the air inlet pipe or air outlet pipe. The iron wire is used to clean the mud blocking the air inlet or air outlet after being inserted into the air inlet pipe or air outlet pipe.
[0015] Furthermore, the maximum diameter of the wire is 2mm, and the length of the wire is not less than 70cm.
[0016] Secondly, this application provides a soil gas geochemical measuring device, including the aforementioned spiral sampler, as well as a dryer, a filter, and a gas analyzer with a pump. The inlet pipe of the spiral sampler is connected to the inlet end of the dryer, the outlet end of the dryer is connected to the inlet end of the filter, the outlet end of the filter is connected to the inlet of the gas analyzer, the detected gas is discharged from the outlet of the gas analyzer, and the outlet of the gas analyzer is connected to the return pipe.
[0017] Compared with the prior art, this application has at least the following beneficial effects:
[0018] 1. The spiral sampler provided in this application has multiple air inlets and multiple air outlets on its drill bit. The air inlets are connected to the air inlet pipe, and the air outlets are connected to the air return pipe. In use, the drill bit is spirally tightened into the surface detection hole by holding the handle. The air inlet pipe can send the gas collected from the soil into the air inlet of the gas analyzer, and the air return pipe can send the gas discharged from the gas analyzer to the air outlet and then to the detection hole. Therefore, the spiral sampler provided in this application can send the gas discharged from the gas analyzer back into the detection hole into which the drill bit is inserted, realizing the circulation of gas in the soil and the instrument. This can not only circulate the gas flux in the entire gas path, but also stabilize the gas content data in the instrument and improve the accuracy of the measurement data.
[0019] 2. The connecting pipe or handle of the spiral sampler provided in this application is wound with a section of iron wire. After the iron wire is straightened, it can be inserted into the air inlet pipe or air return pipe to clean the mud blocking the air inlet or air outlet. Therefore, this application solves the problem that gas measurement cannot continue due to the blockage of small air holes in the drill bit, and also extends the service life of the air pump to a certain extent. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing this application; for example, based on the technical concepts disclosed in this application and the exemplary drawings, those skilled in the art are able to easily make conventional adjustments or further optimizations to the addition / reduction / classification, specific shapes, positional relationships, connection methods, and size ratios of certain units (components).
[0021] Figure 1 This is a schematic diagram of the structure of the spiral sampler provided in this application in one embodiment. The arrows on the drill bit attachment in the figure indicate the direction of gas flow in the soil.
[0022] Figure 2 This is a system architecture diagram of the soil gas geochemical measurement device provided in this application in one embodiment;
[0023] Figure 3(a) is a schematic diagram of the structure of the first type of conventional gas sampler. The arrows in the figure indicate the flow direction of the collected gas.
[0024] Figure 3(b) is a graph of gas concentration over time obtained by using the gas sampler shown in Figure 3(a) to conduct gas geochemical measurements.
[0025] Figure 4(a) is a schematic diagram of the second type of conventional gas sampler. The solid arrows in the figure indicate the direction of gas flow, and the dashed arrows indicate the direction of air flow.
[0026] Figure 4(b) is a graph of gas concentration over time obtained by using the gas sampler shown in Figure 4(a) to conduct gas geochemical measurements.
[0027] Figure 5(a) is a schematic diagram of the spiral sampler provided in this application. The arrow on the right side of the figure indicates the flow direction of the collected gas, and the arrow on the left side of the figure indicates the flow direction of the gas discharged from the gas analyzer in the drill bit.
[0028] Figure 5(b) is a graph of gas concentration over time obtained by using the spiral sampler provided in this application to perform gas geochemical measurements.
[0029] Explanation of reference numerals in the attached figures:
[0030] 1. Spiral sampler; 11. Drill rod; 12. Connecting pipe; 13. Handle; 14. Air inlet pipe; 15. Air return pipe; 16. Air inlet; 17. Air outlet; 18. Drill bit;
[0031] 2. Dryer;
[0032] 3. Filter;
[0033] 4. Air pump;
[0034] 5. Gas analyzer;
[0035] 6. Three-way valve;
[0036] 100. Air inlet hole; 101. Air delivery pipe;
[0037] 200. Air inlet; 201. Air outlet; 202. Air duct. Detailed Implementation
[0038] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0039] In the description of this application: unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," etc., in this application are intended to distinguish the objects referred to and do not have any special meaning in terms of technical connotation (e.g., they should not be construed as an emphasis on importance or order). Expressions such as "comprising," "including," and "having" also mean "not limited to" (certain units, components, materials, steps, etc.).
[0040] The terms used in this application, such as "upper," "lower," "left," "right," and "middle," are generally used to facilitate intuitive understanding by referring to the accompanying drawings, and are not absolute limitations on the positional relationships in the actual product. Changes in these relative positional relationships, without departing from the technical concept disclosed in this application, should also be considered within the scope of this application.
[0041] Example 1
[0042] This embodiment provides a spiral sampler; see [link / reference] Figure 1 , 2 The spiral sampler 1 mainly includes a drill bit 18, a drill rod 11, a connecting pipe 12, and a handle 13. The drill rod 11 includes a hollow frustum-shaped main tube section and a cutting edge spirally wound around the main tube section. The drill bit 18 is connected to the small-diameter end of the drill rod 11. The drill bit 18 has an inner cavity. Multiple air inlets 16 and multiple air outlets 17 are provided on the side wall of the drill bit 18. A connecting pipe 12 is provided at the large-diameter end of the drill rod 11. A handle 13 is provided at the end of the connecting pipe 12 away from the drill rod 11. The inner cavity of the drill bit 18, the tube cavity of the drill rod 11, and the tube cavity of the connecting pipe 12 are connected in sequence. An air inlet pipe 14 connected to the air inlet 16 and a return air pipe 15 connected to the air outlet 17 are provided inside the drill bit 18. The air inlet pipe 14 and the return air pipe 15 extend outward from the tube cavity of the connecting pipe 12. The air inlet pipe 14 is used to transport the collected gas to the air inlet of the gas analyzer 5. The return air pipe 15 is used to send the gas discharged from the gas analyzer 5 to the air outlet 17 for discharge.
[0043] Compared to traditional spiral samplers, the spiral sampler provided in this application has an air outlet 17 at the drill bit and a return air pipe 15 connected to the air outlet 17 in the drill bit 18. Therefore, the gas discharged from the gas analyzer 5 can be circulated through the return air pipe 15 to the detection hole into which the drill bit 11 is inserted, and then sent back into the gas analyzer 5 for detection through the air inlet 16, realizing the circulation of gas in the soil and the instrument. This can both circulate the gas flux in the entire gas path and stabilize the gas content data in the instrument.
[0044] Therefore, the spiral sampler provided in this application, through its "circulation-reinjection" gas path design, transforms the original single-extraction and direct discharge working mode into a closed-loop gas path, which to a certain extent solves the two major problems of pore blockage and transient gas concentration distortion. Specifically, the airflow can repeatedly flush the pores during the "extraction-reinjection" cycle, blowing away the loose soil that initially enters, significantly reducing the probability of blockage. Once a slight blockage occurs, the reinjected positive pressure airflow can act as a backflushing action, achieving real-time online cleaning and reducing the probability of downtime for pore cleaning. In addition, the extracted gas, after being analyzed by the instrument, is all reinjected into the soil pores of the sampling probe. The total gas volume of the gas path system remains basically constant, preventing the "emptying" of local soil due to continuous gas extraction, thus eliminating the phenomenon of rapid concentration drop and avoiding damage to the gas pump caused by running dry due to emptying. Furthermore, the gas circulation and reinjection establishes a dynamic balance between the soil and the instrument, transforming the instrument reading from a transient peak value to a steady-state reading, facilitating accurate reading of the average value and reducing the number of repeated measurements.
[0045] In this embodiment, the drill bit 18 is cylindrical, and the end of the drill bit 18 away from the drill rod 11 is provided with a tapered end. The outer diameter of the drill bit 18 is less than or equal to the outer diameter of the small diameter end of the drill rod 11. Therefore, the whole formed by the drill rod and the drill bit is cone-shaped, which makes it easy to screw into the surface detection hole in a spiral manner.
[0046] In this embodiment, the aforementioned plurality of air inlets 16 and air outlets 17 are evenly arranged on the outer wall of the drill bit 18. In a specific embodiment, six air inlets 16 are arranged in two rows on the outer wall of the drill bit 18, with three air inlets 16 in each row, and six air outlets 17 are arranged in two rows on the outer wall of the drill bit 18, with three air outlets 17 in each row. The six air inlets 16 are connected to the air inlet pipe 14, and the six air outlets 17 are connected to the air return pipe 15.
[0047] In this embodiment, the handle 13 is a horizontal bar connected to the end of the connecting pipe 12. The connecting pipe 12 and the handle 13 form a "T" shaped structure. The connection between the handle 13 and the connecting pipe 12 forms a channel that allows the air intake pipe 14 and the air return pipe 15 to pass through.
[0048] In this embodiment, a section of iron wire can be wound around the connecting pipe 12 or the handle 13. The iron wire can be inserted into the air inlet pipe 14 or the air return pipe 15. The iron wire is used to clean the mud blocking the air inlet hole 16 or the air outlet hole 17 after being inserted into the air inlet pipe 14 or the air return pipe 15.
[0049] Compared with traditional spiral samplers, this application equips the spiral sampler with a clearing device, which adds a wire. When the air hole is blocked, the wire can be used to push down into the air inlet pipe 14 or air return pipe 15 of the spiral sampler to clear the blocked mud and sand, thereby clearing the air hole.
[0050] In one specific embodiment, the maximum diameter of the wire is 2mm. This diameter wire has a certain degree of flexibility and can be wrapped around the handle 13 or the connecting tube 12 for easy carrying. In addition, the length of the wire should exceed the length of the air inlet pipe 14 or the air return pipe 15, preferably the length of the wire is not less than 70cm, so that it can be easily inserted into the air inlet pipe 14 or the air return pipe 15. By rotating the wire, the dirt in the drill bit 18 is discharged from the air hole on the side wall of the drill bit 18, thereby clearing the small holes blocked in the drill bit 18. This solves the problem that gas measurement cannot continue due to the blockage of small air holes in the drill bit 18, and also improves the service life of the air pump to a certain extent.
[0051] Therefore, the spiral sampler provided in this application can minimize the probability of downtime for drilling, reduce the probability of repeated insertion and removal of the drill bit, and improve the accuracy of measurement data.
[0052] Example 2
[0053] This embodiment provides a soil gas geochemical measurement device, including the spiral sampler provided in Embodiment 1 above, as well as a dryer 2, a filter 3, and a gas analyzer 5 with a vacuum pump 4. The inlet pipe 14 of the spiral sampler is connected to the inlet end of the dryer 2, the outlet end of the dryer 2 is connected to the inlet end of the filter 3, the outlet end of the filter 3 is connected to the inlet of the gas analyzer 5, the detected gas is discharged from the outlet of the gas analyzer 5, and the outlet of the gas analyzer 5 is connected to the return pipe 15.
[0054] When using the soil gas geochemical measurement device provided in this embodiment to measure the ground gas, firstly, a hole (detection hole, generally 70-100cm deep) is pre-drilled on the ground surface. Then, the drill bit of the spiral sampler is tightened into the detection hole. The drilling depth of the drill bit can be 40-50cm. Then, the air inlet pipe 14 extending from the spiral sampler is connected to the air inlet of the dryer 2, filter 3 and gas analyzer 5 to form a gas supply path. The return gas pipe 15 extending from the spiral sampler is connected to the air outlet of the gas analyzer 5 to form a return gas path. After the device is installed, the air pump 4 is started, and the gas in the detection hole is collected through the spiral sampler. The collected gas is dried and filtered and then sent to the gas analyzer 5 for detection and analysis. The gas discharged from the gas analyzer 5 is then circulated back into the detection hole through the return gas pipe 15.
[0055] Therefore, the soil gas geochemical measurement device provided in this application establishes a dynamic balance between the soil and the instrument through gas circulation and reinjection. The instrument reading changes from transient peak value to steady-state reading, which facilitates accurate reading of the average value and reduces the number of repeated measurements. This gas circulation and reinjection method can continuously circulate at the same depth for several minutes or even tens of minutes, which is equivalent to increasing the sampling volume, enabling the capture of low-concentration anomalies and improving exploration sensitivity. In addition, this gas circulation and reinjection method prevents the gas from being discharged, avoiding the release of volatile anomalous components into the atmosphere, and also prevents the introduction of external air. The original gas components of the soil are not diluted or oxidized, ensuring that the data truly reflects the original geochemical field.
[0056] The following is a comparative experiment on gas measurements conducted using a traditional gas sampler and the spiral sampler provided in this application:
[0057] Referring to Figure 3(a), which is a schematic diagram of the first type of conventional gas sampler, the drill bit of this conventional gas sampler is equipped with an air inlet hole 100, which is connected to a gas delivery pipe 101. The gas collected by the drill bit is sent to the gas analyzer through the gas delivery pipe 101, and the airflow is unidirectional. The gas concentration-time curve obtained by using this conventional gas sampler for gas geochemical measurement is shown in Figure 3(b). It can be seen that as the measurement time increases, the carbon dioxide gas content slowly increases from the air concentration (400-500 ppm), reaches a maximum value (i.e., soil carbon dioxide concentration), and then slowly decreases until it drops below the air concentration. We record the maximum value as the gas concentration value of this measurement.
[0058] Referring to Figure 4(a), which is a schematic diagram of the second type of conventional gas sampler, this conventional gas sampler has an inlet 200 and an outlet 201 on its drill bit. The inlet 200 is connected to the gas guide tube 202, and the outlet 201 is connected to the atmospheric gas. The gas collected by the drill bit is sent to the gas analyzer through the gas guide tube 202. During the process, air enters the drill bit to balance the pressure inside the detection hole. The gas concentration-time curve obtained by using this conventional gas sampler for gas geochemical measurement is shown in Figure 4(b). It can be seen that as the measurement time increases, the carbon dioxide gas content slowly increases from the air concentration (400-500 ppm), reaches a maximum value (i.e., soil carbon dioxide concentration), and then slowly drops back to the air concentration. We record the maximum value as the gas concentration value of this measurement.
[0059] Referring to Figure 5(a), which is a schematic diagram of the spiral sampler provided in this application, the drill bit is equipped with an air inlet and an air outlet. The air inlet is connected to the air inlet pipe, and the air outlet is connected to the air return pipe. The gas collected by the drill bit is sent to the gas analyzer through the air inlet pipe, and the gas discharged from the gas analyzer is then circulated back into the detection hole through the air return pipe. The gas concentration-time curve obtained by using the spiral sampler provided in this application for gas geochemical measurement is shown in Figure 5(b). It can be seen that as the measurement time increases, the carbon dioxide gas content slowly increases from the air concentration (400-500 ppm), reaches a maximum value (i.e., soil carbon dioxide concentration), and then remains relatively stable or fluctuates within the maximum value range. We will record this relatively stable value as the gas concentration value of this measurement.
[0060] Comparing the measurement results of the three sets of gas samplers, it can be found that the gas concentration value obtained by using the spiral sampler provided in this application can remain stable over a period of time, which makes it easier for us to accurately obtain the gas concentration value of this measurement.
[0061] The technical features of the above embodiments can be combined in any way (as long as there is no contradiction in the combination of these technical features). For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written should also be considered to be within the scope of this specification.
[0062] The present application has been described in a relatively specific and detailed manner above through general descriptions and specific embodiments. It should be understood that, based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not depart from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the protection scope of the claims of the present application.
Claims
1. A spiral sampler, characterized in that, The device includes a drill rod, a drill bit connected to one end of the drill rod, a connecting pipe connected to the other end of the drill rod, and a handle connected to the connecting pipe. The drill rod is in the shape of a hollow frustum, and a cutting edge is spirally wound around its outer wall. The drill bit is connected to the small-diameter end of the drill rod and has an inner cavity. Multiple air inlets and multiple air outlets are provided on the side wall of the drill bit. The connecting pipe is provided at the large-diameter end of the drill rod, and the handle is provided at the end of the connecting pipe away from the drill rod. The inner cavity of the drill bit, the cavity of the drill rod, and the cavity of the connecting pipe are sequentially connected. An air inlet pipe connected to the air inlet and a return air pipe connected to the air outlet are provided inside the drill bit. The air inlet pipe and the return air pipe extend outward from the cavity of the connecting pipe. The air inlet pipe is used to transport the collected gas to the air inlet of a gas analyzer, and the return air pipe is used to send the gas discharged from the gas analyzer to the air outlet for discharge.
2. The auger according to claim 1, wherein, The drill bit is cylindrical, and the end of the drill bit facing away from the drill rod is provided with a tapered end. The outer diameter of the drill bit is less than or equal to the outer diameter of the small diameter end of the drill rod.
3. The auger according to claim 1, wherein, The plurality of air inlets are evenly arranged on the outer wall of the drill bit, and the plurality of air outlets are evenly arranged on the outer wall of the drill bit.
4. The auger according to claim 3, wherein, The six air inlets are arranged in two rows on the outer wall of the drill bit, and the six air outlets are arranged in two rows on the outer wall of the drill bit.
5. The auger according to claim 1, wherein, The handle is a horizontal bar connected to the end of the connecting pipe, and the connection between the handle and the connecting pipe forms a channel that allows the intake pipe and the return pipe to pass through.
6. The auger according to claim 1, wherein, A section of iron wire is wound around the connecting pipe or handle. The iron wire can be inserted into the air inlet pipe or air outlet pipe. The iron wire is used to clean the mud blocking the air inlet or air outlet after being inserted into the air inlet pipe or air outlet pipe.
7. The auger according to claim 6, wherein, The maximum diameter of the wire is 2mm, and the length of the wire is not less than 70cm.
8. A soil gas geochemical survey apparatus, characterized by comprising: The invention includes the spiral sampler as described in any one of claims 1-7, as well as a dryer, a filter, and a gas analyzer with a suction pump. The inlet pipe of the spiral sampler is connected to the inlet end of the dryer, the outlet end of the dryer is connected to the inlet end of the filter, the outlet end of the filter is connected to the inlet of the gas analyzer, the detected gas is discharged from the outlet of the gas analyzer, and the outlet of the gas analyzer is connected to the return pipe.