In-situ soil profile gas collection device

Abstract

The invention relates to the technical field of soil gas collection, and particularly discloses an in-situ soil profile gas collection device which comprises an inner pipe, a pipe body and a strip-shaped belt, the pipe body comprises an exposed end and an insertion end, the inner pipe is located in an inner cavity of the pipe body, and one end of the inner pipe is detachably connected with the position, close to the insertion end, of the inner wall of the pipe body; the inner wall of the inner pipe is connected with one end of the supporting rod, no less than three elastic rings are installed on the peripheral side of the strip-shaped belt at equal intervals, the inner diameter of the strip-shaped belt is larger than the outer diameter of the inner pipe, the strip-shaped belt is arranged on the inner pipe in a sleeving mode, each elastic ring is hooped on the peripheral side of the inner pipe in a sleeving mode, and the elastic rings are connected with the supporting rod. According to the technical scheme, in-situ collection of nitrous oxide gas of the soil profile is achieved, the device is suitable for measuring nitrous oxide for a long time, and interference to microclimate of the earth surface is small.

Description

Technical Field

[0001] This invention relates to the field of soil gas collection technology, specifically to an in-situ soil profile gas collection device. Background Technology

[0002] To ensure crop yields, various types of nitrogen fertilizers are used during crop cultivation. However, nitrogen fertilizers are not completely absorbed by crops. Some nitrogen fertilizers are converted into nitrous oxide by microorganisms, and then nitrous oxide enters the atmosphere. Nitrous oxide is a greenhouse gas with a warming capacity more than 270 times that of carbon dioxide. Moreover, nitrous oxide is a major cause of stratospheric ozone depletion.

[0003] To develop effective greenhouse gas emission reduction strategies and improve nitrogen fertilizer utilization, it is necessary to study the generation, accumulation, and transport of nitrous oxide in soil profiles, thereby deriving the mechanisms of soil greenhouse gas generation and emission.

[0004] In existing technologies, a sealed box with an open bottom is placed on the soil surface. The concentration of nitrous oxide inside the box increases over time. The flux is calculated by measuring the rate of concentration change. An automated system automatically opens and closes the box lid and automatically collects and analyzes the gas. However, the temperature, humidity, air pressure, and wind speed inside the box are different from those outside the box, which can affect the activity of soil microorganisms and gas diffusion. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide an in-situ soil profile gas collection device to realize the in-situ collection of nitrous oxide gas from the soil profile. It is suitable for long-term measurement of nitrous oxide and has less interference with the surface microclimate.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an in-situ soil profile gas collection device, comprising an inner tube, a tube body, and a strip, wherein the tube body includes an exposed end and an inserted end, the inner tube is located in the inner cavity of the tube body, one end of the inner tube is detachably connected to the inner wall of the tube body near the inserted end, and the inner wall of the inner tube is connected to one end of a support rod.

[0007] At least three elastic rings are installed at equal intervals on the outer periphery of the strip. The inner diameter of the strip is larger than the outer diameter of the inner tube. The strip is sleeved on the inner tube, and each elastic ring is clamped on the outer periphery of the inner tube. A traction assembly that drives one end of the strip to move is installed on the tube body.

[0008] In this process, the pulling assembly pulls one end of the strip to move, and the elastic ring on the inner tube that is furthest from the insertion end of the tube body disengages from the outer periphery of the inner tube. The elastic ring that disengages from the inner tube is then fitted onto the outer periphery of the support rod.

[0009] Among them, two adjacent elastic rings on the outer periphery of the support rod cause the strip to form an air storage bag on the support rod.

[0010] As a preferred embodiment of the present invention, at least three annular plates are installed at equal intervals on the inner wall of the strip, and the elastic ring and the annular plates are staggered in the length direction of the strip. The inner diameter of the annular plate is greater than or equal to the outer diameter of the inner tube, and the outer diameter of the annular plate is smaller than the inner diameter of the tube.

[0011] As a preferred embodiment of the present invention, it further includes a water storage container and a connecting pipe. The support rod is provided with a water passage cavity, and a connecting hole for connecting the water passage cavity is opened on the outer periphery of the support rod. The water passage cavity and the water storage container are connected by the connecting pipe.

[0012] The water storage container contains water, and the gas storage bag closest to the inner tube is connected to the connecting hole.

[0013] In a preferred embodiment of the present invention, water is filled between the strip and the tube, and the water between the strip and the tube submerges the entire gas storage bag.

[0014] As a preferred embodiment of the present invention, the pulling assembly includes a motor mounted on the tube body, a winding reel mounted on the output shaft of the motor, one end of the winding reel being fixedly connected to the pulling rope, and the other end of the pulling rope being connected to a strip of tape at a position away from the insertion end of the tube body.

[0015] As a preferred embodiment of the present invention, the strips are stacked and sleeved on the inner tube.

[0016] As a preferred embodiment of the present invention, a plurality of openings are provided on the outer periphery of the tube body near the insertion end of the tube body, and the openings are located between the insertion end of the tube body and the inner tube.

[0017] As a preferred embodiment of the present invention, a cone is installed at the insertion end of the tube.

[0018] As a preferred embodiment of the present invention, the inner wall of the tube body is fixedly connected to one end of the positioning tube, and the other end of the positioning tube is detachably connected to one end of the inner tube.

[0019] As a preferred embodiment of the present invention, the tube body is made of metal or plastic.

[0020] Compared with the prior art, the beneficial effects of the present invention are: 1. The in-situ soil profile gas collection device of this invention allows the operator to pull one end of a strip upwards at set intervals using a pulling component, with each pull moving the strip upwards by the height of a gas storage bag. On one hand, the newly formed gas storage bag carries away a portion of the air from the inner tube, enabling in-situ collection of nitrous oxide gas from the soil profile. On the other hand, during the process of pulling the strip upwards by the height of a gas storage bag, the air pressure inside the inner tube decreases, causing nitrous oxide in the soil to escape and enter the inner tube, thus enabling continuous sampling of nitrous oxide from the soil profile. This facilitates convenient in-situ continuous collection of nitrous oxide gas from the soil profile. Furthermore, the annular plate ensures that the volume of each gas storage bag is approximately the same, improving the reliability of this in-situ soil profile gas collection device.

[0021] 2. The in-situ soil profile gas collection device of the present invention restores the gas pressure in the gas storage bag and prevents gas flow between two adjacent gas storage bags. On the other hand, it prevents the gas in the gas storage bag from being drawn into the inner tube, thereby improving the reliability of the in-situ soil profile gas collection device.

[0022] 3. In the in-situ soil profile gas collection device of the present invention, when the surface of the gas storage bag is damaged, the water between the strip and the tube prevents external air from entering the gas storage bag through the damaged area, thereby improving the accuracy of the in-situ soil profile gas collection device. Furthermore, the water between the strip and the tube reduces the impact of ground temperature changes on the microbial activity at the bottom of the detection well. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an embodiment of the present invention; Figure 2 for Figure 1 A partial sectional view of the structure; Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A; Figure 4 for Figure 2 Enlarged schematic diagram of the structure at point B; Figure 5 for Figure 2 Enlarged schematic diagram of the structure at point C; Figure 6 This is a partial cross-sectional view of another embodiment of the present invention.

[0024] In the diagram: 1. Water storage container, 2. Connecting pipe, 3. Winding reel, 4. Motor, 5. Pipe body, 6. Support rod, 7. Pull rope, 8. Inner pipe, 9. Opening, 10. Connecting hole, 11. Air storage bag, 12. Elastic ring, 13. Ring plate, 14. Strip belt, 15. Water passage cavity, 16. Positioning pipe, 17. Cone head. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0026] Example 1: Please refer to Figures 1-5 This embodiment discloses an in-situ soil profile gas collection device, including an inner tube 8, a circular tube body 5, and a flexible strip 14. The tube body 5 includes an exposed end and an inserted end. The inner tube 8 is located in the inner cavity of the tube body 5. One end of the inner tube 8 is snapped or glued to the inner wall of the tube body 5 near the inserted end. The inner wall of the inner tube 8 is fixedly connected to one end of the support rod 6.

[0027] At least three elastic rings 12 are fixedly installed at equal intervals on the outer periphery of the strip 14. The inner diameter of the strip 14 is larger than the outer diameter of the inner tube 8. The strip 14 is sleeved on the inner tube 8. Each elastic ring 12 is clamped on the outer periphery of the inner tube 8. A pulling component is installed on the tube body 5 to drive one end of the strip 14 to move. The pulling component drives the strip 14 to move toward the exposed end of the tube body 5. The inner diameter of the elastic ring 12 in its natural placement state is smaller than the inner diameter of the support rod 6.

[0028] Among them, the pulling component pulls one end of the strip 14 to move, and the elastic ring 12 on the inner tube 8 that is farthest from the insertion end of the tube body 5 is detached from the outer periphery of the inner tube 8. The elastic ring 12 that is detached from the inner tube 8 is clamped on the outer periphery of the support rod 6.

[0029] Among them, two adjacent elastic rings 12 on the outer periphery of the support rod 6 cause the strip 14 to form an air storage bag 11 on the support rod 6.

[0030] Preferably, the pulling component is a traction rope or a traction rod. One end of the pulling component is fixedly connected to the strip 14 at a position away from the insertion end of the tube body 5, and the other end of the pulling component extends out of the tube body 5 through the exposed end of the tube body 5.

[0031] Preferably, the elastic ring 12 is made of elastic rubber, elastic silicone, or a serpentine spring with its two ends connected together.

[0032] Preferably, the tube body 5 is made of metal, glass, or hard plastic, and the strip 14 is made of soft plastic or soft rubber, with a thickness of 0.025mm-0.500mm.

[0033] The working process and principle of this embodiment are as follows: The operator uses an external drilling machine or an external iron rod to drill holes in the soil, forming vertical detection holes 10cm-200cm deep. The operator removes debris such as soil and stones from the detection holes. The inner diameter of the detection hole is equal to the outer diameter of the tube 5. The operator inserts the insertion end of the tube 5 into the detection hole and applies pressure to the exposed end of the tube 5 to make the insertion end of the tube 5 contact the soil at the bottom of the detection hole. The exposed end of the tube 5 protrudes from the ground. At set intervals, the operator pulls one end of the strip 14 upward using the pulling component, and each time the strip 14 is pulled up by the height of a gas storage bag 11, so that a new gas storage bag 11 is formed on the support rod 6. The newly formed gas storage bag 11 carries away a part of the air in the inner tube 8, realizing the in-situ collection of nitrous oxide gas from the soil profile. This method is suitable for long-term measurement of nitrous oxide and has little interference with the surface microclimate.

[0034] During the process of pulling the strip 14 up to the height of the gas storage bag 11, the gas pressure inside the inner tube 8 decreases, causing nitrous oxide in the soil to escape and enter the inner tube 8, thus enabling continuous sampling of nitrous oxide from the soil profile. In-situ continuous collection of nitrous oxide gas from the soil profile is convenient and suitable for small-scale multi-site studies of different ecosystems.

[0035] The gas inside the inner tube 8 is prevented from entering by precipitation or snowmelt, ensuring the normal operation of the in-situ soil profile gas collection device.

[0036] Operators should periodically, such as every half month or month, retrieve the device and send it back to the laboratory for analysis of nitrous oxide concentration using gas chromatography or isotope mass spectrometry.

[0037] Preferably, after the insertion end of the tube body 5 is inserted into the detection hole, the operator splashes water on the ground near the tube body 5. The water seeps into the ground, causing the soil on the inner wall of the tube body 5 to adhere, thus improving the sealing at the insertion end of the tube body 5.

[0038] Preferably, after the insertion end of the tube body 5 is inserted into the detection hole, the operator piles up a 5cm-15cm mound of soil above the detection hole, with the exposed end of the tube body 5 protruding from the mound of soil. The operator then pats and compacts the mound of soil, forming a tight sealing layer.

[0039] Preferably, the diameter of the detection hole is 20mm-50mm.

[0040] Example 2: Figure 2 , Figure 4 and Figure 5As shown, this embodiment discloses an in-situ soil profile gas collection device, whose structure is roughly the same as that of Embodiment 1. The difference is that in this embodiment, no fewer than three annular plates 13 are fixedly installed at equal intervals on the inner wall of the strip 14, and the elastic ring 12 and the annular plates 13 are staggered in the length direction of the strip 14. The inner diameter of the annular plate 13 is greater than or equal to the outer diameter of the inner tube 8, and the outer diameter of the annular plate 13 is smaller than the inner diameter of the tube body 5.

[0041] The working process and principle of this embodiment are as follows: The annular plate 13 makes the volume of each gas storage bag 11 approximately the same, improving the reliability of the in-situ soil profile gas collection device.

[0042] Example 3: Figure 1 and Figure 2 As shown, this embodiment discloses an in-situ soil profile gas collection device, whose structure is roughly the same as that of Embodiment 2. The difference is that this embodiment also includes a water storage container 1 and a connecting pipe 2. A water passage cavity 15 is provided inside the support rod 6, and a connecting hole 10 connecting the water passage cavity 15 is opened on the outer periphery of the support rod 6. The water passage cavity 15 and the water storage container 1 are connected through the connecting pipe 2.

[0043] The water storage container 1 contains water, and the air storage bag 11 closest to the inner tube 8 is connected to the connecting hole 10.

[0044] The working process and principle of this embodiment are as follows: When a new gas storage bag 11 is formed on the support rod 6, the newly formed gas storage bag 11 is under negative pressure. The newly formed gas storage bag 11 draws water from the water storage container 1 through the water passage 15 and the connecting pipe 2, so that the bottom of the inner cavity of the gas storage bag 11 is filled with water. On the one hand, this restores the gas pressure in the gas storage bag 11 and avoids gas flow between two adjacent gas storage bags 11. On the other hand, it prevents the gas in the gas storage bag 11 from being drawn into the inner pipe 8, thereby improving the reliability of the in-situ soil profile gas collection device.

[0045] Preferably, the water storage container 1 is a water storage bag or a water storage tank.

[0046] Example 4: Figure 2 As shown, this embodiment discloses an in-situ soil profile gas collection device, whose structure is roughly the same as that of Embodiment 1. The difference is that water is filled between the strip 14 and the tube 5, and the water between the strip 14 and the tube 5 submerges the entire gas storage bag 11.

[0047] The working process and principle of this embodiment are as follows: When the surface of the gas storage bag 11 is damaged, the water between the strip 14 and the tube 5 prevents outside air from entering the gas storage bag 11 through the damaged area, thus improving the accuracy of the in-situ soil profile gas sampling device. In addition, the water between the strip 14 and the tube 5 reduces the impact of ground temperature changes on microbial activity at the bottom of the detection well.

[0048] Example 5: Figure 1 and Figure 2 As shown, this embodiment discloses an in-situ soil profile gas collection device, whose structure is roughly the same as that of Embodiment 1. The difference is that the pulling component in this embodiment includes a motor 4 mounted on the tube body 5 via a fixed base. A winding disc 3 is coaxially mounted on the output shaft of the motor 4. One end of the winding disc 3 and the pulling rope 7 are fixedly connected, and the other end of the pulling rope 7 is connected to the strip 14 at a position away from the insertion end of the tube body 5.

[0049] The motor 4 used in this invention is a commonly used electronic component in the prior art. Its working method and circuit structure are well-known technologies and will not be described in detail here.

[0050] The working process and principle of this embodiment are as follows: The operator drives the motor 4 to rotate the winding reel 3. The winding reel 3 moves the strip belt 14 through the pull rope 7. The elastic ring 12 on the inner tube 8 falls off the inner tube 8 and the strip belt 14 forms an air storage bag 11 on the support rod 6.

[0051] Preferably, motor 4 is a stepper motor, servo motor, or brushless DC motor with encoder. Motor 4 is electrically connected to an external controller, which is powered by a battery, solar energy, or wind power. The external controller is a microcontroller or an embedded controller.

[0052] Example 6: Figure 2 and Figure 5 As shown, this embodiment discloses an in-situ soil profile gas collection device, whose structure is roughly the same as that of Embodiment 1. The difference is that in this embodiment, the strip 14 is stacked and sleeved on the inner tube 8, reducing the length of the inner tube 8 and thus reducing the cost of the device.

[0053] Example 7: Figure 1 , Figure 2 As shown, this embodiment discloses an in-situ soil profile gas collection device, whose structure is roughly the same as that of Embodiment 1. The difference is that in this embodiment, several openings 9 are provided on the outer periphery of the tube body 5 near the insertion end of the tube body 5, and the openings 9 are located between the insertion end of the tube body 5 and the inner tube 8.

[0054] The working process and principle of this embodiment are as follows: The opening 9 improves the gas exchange efficiency between the insertion end of the tube 5 and the soil.

[0055] Example 8: Figure 6 As shown, this embodiment discloses an in-situ soil profile gas collection device, whose structure is roughly the same as that of Embodiment 7. The difference is that the insertion end of the tube body 5 in this embodiment is equipped with a cone head 17, which facilitates the insertion of the tube body 5 into the detection hole.

[0056] Furthermore, the cone 17 eliminates the need for operators to drill or punch test holes in the soil beforehand. Operators can drive the tube body 5 to drive the cone 17 into the soil and form a test hole in the soil. The outer periphery of the tube body 5 and the inner wall of the test hole can fit tightly together.

[0057] Example 9: Figure 5 As shown, this embodiment discloses an in-situ soil profile gas collection device, whose structure is roughly the same as that of Embodiment 1. The difference is that in this embodiment, the inner wall of the tube body 5 is fixedly connected to one end of the positioning tube 16, and the other end of the positioning tube 16 is threadedly connected to one end of the inner tube 8 or snapped together.

[0058] When one elastic ring 12 remains on the inner tube 8, the operator detaches the inner tube 8 from the positioning tube 16, and then installs the new inner tube 8 on the positioning tube 16 to increase the working time of the in-situ soil profile gas collection device.

[0059] Although embodiments of the 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 invention.

Claims

1. An in-situ soil profile gas collection device, characterized in that: It includes an inner tube (8), a tube body (5) and a strip (14). The tube body (5) includes an exposed end and an inserted end. The inner tube (8) is located in the inner cavity of the tube body (5). One end of the inner tube (8) is detachably connected to the inner wall of the tube body (5) near the inserted end. The inner wall of the inner tube (8) is connected to one end of the support rod (6). The outer periphery of the strip (14) is equipped with at least three elastic rings (12) at equal intervals. The inner diameter of the strip (14) is larger than the outer diameter of the inner tube (8). The strip (14) is sleeved on the inner tube (8). Each elastic ring (12) is clamped on the outer periphery of the inner tube (8). The tube body (5) is equipped with a traction component that drives one end of the strip (14) to move. Among them, the pulling component pulls one end of the strip (14) to move, and the elastic ring (12) on the inner tube (8) that is farthest from the insertion end of the tube body (5) is separated from the outer periphery of the inner tube (8), and the elastic ring (12) that is separated from the inner tube (8) is clamped on the outer periphery of the support rod (6). Among them, two adjacent elastic rings (12) on the outer periphery of the support rod (6) cause the strip (14) to form an air storage bag (11) on the support rod (6).

2. The in-situ soil profile gas collection device according to claim 1, characterized in that: The inner wall of the strip (14) is equipped with at least three annular plates (13) at equal intervals, and the elastic ring (12) and the annular plates (13) are staggered in the length direction of the strip (14). The inner diameter of the annular plate (13) is greater than or equal to the outer diameter of the inner tube (8), and the outer diameter of the annular plate (13) is less than the inner diameter of the tube body (5).

3. The in-situ soil profile gas collection device according to claim 2, characterized in that: It also includes a water storage container (1) and a connecting pipe (2). The support rod (6) is provided with a water passage cavity (15). The support rod (6) is provided with a connecting hole (10) connecting the water passage cavity (15) on its outer periphery. The water passage cavity (15) and the water storage container (1) are connected through the connecting pipe (2). The water storage container (1) contains water, and the gas storage bag (11) closest to the inner tube (8) is connected to the connecting hole (10).

4. The in-situ soil profile gas collection device according to claim 3, characterized in that: wherein, Water is filled between the strip (14) and the tube (5), and the water between the strip (14) and the tube (5) submerges the entire gas storage bag (11).

5. The in-situ soil profile gas collection device according to claim 1, characterized in that: The pulling assembly includes a motor (4) mounted on the tube body (5), a winding disc (3) mounted on the output shaft of the motor (4), one end of the winding disc (3) and the pulling rope (7) are fixedly connected, and the other end of the pulling rope (7) is connected to the strip (14) at a position away from the insertion end of the tube body (5).

6. The in-situ soil profile gas collection device according to claim 1, characterized in that: The strip (14) is stacked and sleeved on the inner tube (8).

7. The in-situ soil profile gas collection device according to claim 1, characterized in that: The outer periphery of the tube (5) is provided with a number of openings (9) near the insertion end of the tube (5), and the openings (9) are located between the insertion end of the tube (5) and the inner tube (8).

8. The in-situ soil profile gas collection device according to claim 7, characterized in that: The insertion end of the tube (5) is equipped with a cone (17).

9. The in-situ soil profile gas collection device according to claim 1, characterized in that: The inner wall of the tube body (5) is fixedly connected to one end of the positioning tube (16), and the other end of the positioning tube (16) is detachably connected to one end of the inner tube (8).

10. The in-situ soil profile gas collection device according to claim 1, characterized in that: The tube (5) is made of metal or plastic.

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