An in-situ soil profile gas collection device

Abstract

The application 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 inserted end, the inner pipe is located in the inner cavity of the pipe body, one end of the inner pipe is detachably connected with the inner wall of the pipe body close to the inserted end, the inner wall of the inner pipe is connected with one end of a supporting rod, the outer circumferential side of the strip-shaped belt is equidistantly provided with not less than three elastic rings, the inner diameter of the strip-shaped belt is larger than the outer diameter of the inner pipe, the strip-shaped belt is sleeved on the inner pipe, each elastic ring is clamped on the outer circumferential side of the inner pipe, and the pipe body is provided with a pulling assembly for driving one end of the strip-shaped belt to move. The technical scheme of the example of the application realizes in-situ collection of soil profile nitrous oxide gas, is suitable for long-time measurement of nitrous oxide, and has smaller interference with the surface microclimate.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of soil gas collection, in particular to an in-situ soil profile gas collection device. BACKGROUND

[0002] To ensure crop yield, various types of nitrogen fertilizer are used when crops are planted, but the nitrogen fertilizer is not completely absorbed by the crops, part of the nitrogen fertilizer is converted into nitrous oxide by microorganisms, and then the nitrous oxide enters the atmosphere, the nitrous oxide is a greenhouse gas, and its warming capacity is more than 270 times that of carbon dioxide, and the nitrous oxide is the main reason for the depletion of stratospheric ozone.

[0003] In order to formulate effective greenhouse gas emission reduction strategies and improve the utilization rate of nitrogen fertilizer, it is necessary to study the generation, accumulation and migration of nitrous oxide in the soil profile, so as to obtain the mechanism of soil greenhouse gas generation and emission.

[0004] In the prior art, a closed box with an open lower end is placed on the surface of the soil, the concentration of nitrous oxide in the box increases with time, the flux is calculated by measuring the concentration change rate, and an automatic system realizes automatic opening and closing of the box cover and automatic collection and analysis of the gas, but the temperature and humidity, air pressure and wind speed in the box are different from those outside the box, which will affect the activity of soil microorganisms and gas diffusion. SUMMARY

[0005] The technical problem to be solved by the application is to overcome the defects of the prior art and provide an in-situ soil profile gas collection device, which realizes in-situ collection of nitrous oxide gas in the soil profile and is suitable for long-term measurement of nitrous oxide and has less interference with the surface microclimate.

[0006] To achieve the above object, the application provides the following technical scheme: an in-situ soil profile gas collection device, comprising an inner tube, a tube body and a strip-shaped belt, the tube body comprises an exposed end and an insertion end, the inner tube is located in the inner cavity of the tube body, one end of the inner tube is detachably connected with the inner wall of the tube body near the insertion end, and the inner wall of the inner tube is connected with one end of a supporting rod.

[0007] The outer circumferential side of the strip-shaped belt is provided with not less than three elastic rings at equal intervals, the inner diameter of the strip-shaped belt is greater than the outer diameter of the inner tube, the strip-shaped belt is sleeved on the inner tube, each elastic ring is clamped on the outer circumferential side of the inner tube, and the tube body is provided with a pulling assembly for moving one end of the strip-shaped belt.

[0008] The pulling assembly moves one end of the strip-shaped belt, the elastic ring farthest from the insertion end of the tube body on the inner tube is separated from the outer circumferential side of the inner tube, and the elastic ring separated from the inner tube is clamped on the outer circumferential side of the supporting rod.

[0009] Two adjacent elastic rings on the outer circumferential side of the supporting rod form air storage bags on the supporting rod.

[0010] As a preferred technical scheme of the present application, not less than three annular plates are installed on the inner wall of the strip-shaped belt at equal intervals, and the elastic rings and the annular plates are arranged alternately in the length direction of the strip-shaped belt, 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 less than the inner diameter of the tube body.

[0011] As a preferred technical scheme of the present application, the supporting rod is internally provided with a water passing cavity, and a connecting hole is formed on the outer circumferential side of the supporting rod to connect the water passing cavity, and the water passing cavity and the water storage container are connected through a connecting pipe.

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

[0013] As a preferred technical scheme of the present application, the strip-shaped belt and the tube body are filled with water, and all the air storage bags are submerged in the water.

[0014] As a preferred technical scheme of the present application, the pulling assembly comprises a motor installed on the tube body, a winding disc is installed on the output shaft of the motor, one end of the winding disc is fixedly connected with a pulling rope, and the other end of the pulling rope is connected with the strip-shaped belt at a position away from the insertion end of the tube body.

[0015] As a preferred technical scheme of the present application, the strip-shaped belt is sleeved on the inner tube.

[0016] As a preferred technical scheme of the present application, a plurality of openings are formed on the outer circumferential side of the tube body at a position close to 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 technical scheme of the present application, a tapered head is installed on the insertion end of the tube body.

[0018] As a preferred technical scheme of the present application, the inner wall of the tube body is fixedly connected with one end of a positioning tube, and the other end of the positioning tube is detachably connected with one end of the inner tube.

[0019] As a preferred technical scheme of the present application, the tube body is made of metal or plastic.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] 1. The in-situ soil profile gas collection device of the present application, the operator sets the time interval and pulls one end of the strip belt upward by pulling the assembly, and each time the strip belt is pulled upward by one height of the gas storage bag: on the one hand, the newly formed gas storage bag takes part of the air in the inner tube away, realizing the in-situ soil profile nitrous oxide gas collection; on the other hand, during the process of pulling the strip belt upward by one height of the gas storage bag, the air pressure in the inner tube decreases, prompting the nitrous oxide in the soil to escape, so that the nitrous oxide in the soil enters the inner tube, realizing continuous sampling of the soil profile nitrous oxide, and the in-situ continuous collection of the soil profile nitrous oxide gas is convenient; on the other hand, the annular plate makes the volume of each gas storage bag close, improving the reliability of the in-situ soil profile gas collection device.

[0022] 2. The in-situ soil profile gas collection device of the present application, on the one hand, the gas pressure in the gas storage bag is restored, avoiding the flow of gas between the adjacent two gas storage bags, on the other hand, avoiding the gas in the gas storage bag being sucked into the inner tube, improving the reliability of the in-situ soil profile gas collection device.

[0023] 3. The in-situ soil profile gas collection device of the present application, when the surface of the gas storage bag is damaged, the water between the strip belt and the pipe body prevents external air from entering the gas storage bag through the damaged part of the gas storage bag, improving the accuracy of the in-situ soil profile gas collection device, and the water between the strip belt and the pipe body reduces the influence of ground temperature change on the microbial activity of the detection hole bottom. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structure schematic view of an embodiment of the present application;

[0025] Figure 2 It is a structure schematic view of an embodiment of the present application; Figure 1

[0026] Figure 3 It is an enlarged structure schematic view of A of the present application; Figure 2

[0027] Figure 4 It is an enlarged structure schematic view of B of the present application; Figure 2

[0028] Figure 5 It is an enlarged structure schematic view of C of the present application; Figure 2

[0029] Figure 6 It is a structure schematic view of another embodiment of the present application.

[0030] ​​​​In the figure: 1 water storage container, 2 connecting pipe, 3 winding reel, 4 motor, 5 pipe body, 6 support rod, 7 pull rope, 8 inner tube, 9 opening, 10 connecting hole, 11 air storage bag, 12 elastic ring, 13 annular plate, 14 strip belt, 15 water passing cavity, 16 positioning tube, 17 conical head. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0032] Embodiment one: please refer to Figures 1-5 The embodiment discloses an in-situ soil profile gas collection device, which comprises an inner tube 8, a circular pipe body 5 and a soft strip belt 14. The pipe body 5 comprises an exposed end and an insertion end. The inner tube 8 is located in the inner cavity of the pipe body 5. One end of the inner tube 8 is connected or bonded to the inner wall of the pipe body 5 near the insertion end. The inner wall of the inner tube 8 is fixedly connected to one end of a support rod 6.

[0033] The outer circumferential side of the strip belt 14 is fixedly installed with not less than three elastic rings 12 at equal intervals. The inner diameter of the strip belt 14 is greater than the outer diameter of the inner tube 8. The strip belt 14 is sleeved on the inner tube 8. Each elastic ring 12 is clamped on the outer circumferential side of the inner tube 8. The pipe body 5 is provided with a pulling assembly for moving one end of the strip belt 14. The pulling assembly drives the strip belt 14 to move towards the exposed end of the pipe body 5. The inner diameter of the elastic ring 12 in the natural placement state is less than the inner diameter of the support rod 6.

[0034] The pulling assembly moves one end of the strip belt 14. The elastic ring 12 farthest from the insertion end of the pipe body 5 on the inner tube 8 is separated from the outer circumferential side of the inner tube 8. The elastic ring 12 separated from the inner tube 8 is clamped on the outer circumferential side of the support rod 6.

[0035] The two adjacent elastic rings 12 on the outer circumferential side of the support rod 6 form an air storage bag 11 on the support rod 6.

[0036] Preferably, the pulling assembly is a traction rope or a traction rod. One end of the pulling assembly is fixedly connected to the position of the strip belt 14 away from the insertion end of the pipe body 5. The other end of the pulling assembly extends to the outside of the pipe body 5 through the exposed end of the pipe body 5.

[0037] Preferably, the elastic ring 12 is made of elastic rubber material, elastic silica gel material or a serpentine spring with two ends connected together.

[0038] Preferably, the tube body 5 is made of metal, glass or hard plastic, the strip 14 is made of soft plastic or soft rubber, and the thickness of the strip 14 is 0.025-0.500 mm.

[0039] The working process and principle of the embodiment are as follows:

[0040] The operator drills a hole on the ground by using an external drilling machine or makes a hole in the soil by using an external iron drill, and forms a vertical detection hole with a depth of 10-200 cm in the soil. The operator removes the debris and stones in the detection hole, and the inner diameter of the detection hole is equal to the outer diameter of the tube body 5. The operator inserts the insertion end of the tube body 5 into the detection hole, and presses the exposed end of the tube body 5 to make the insertion end of the tube body 5 contact with the soil at the bottom of the detection hole. The exposed end of the tube body 5 is exposed to the ground. The operator pulls one end of the strip 14 upward at a set interval of time by using the pulling assembly, and pulls the strip 14 upward by the height of one gas storage bag 11 each time, so that a new gas storage bag 11 is formed on the support rod 6. The newly-formed gas storage bag 11 takes part of the air in the inner tube 8 away, realizes in-situ collection of the nitrous oxide gas in the soil profile, and is suitable for long-time measurement of nitrous oxide and less interference with the surface microclimate.

[0041] During the process of pulling the strip 14 upward by the height of one gas storage bag 11, the air pressure in the inner tube 8 decreases, which promotes the nitrous oxide in the soil to escape, so that the nitrous oxide in the soil enters the inner tube 8, and realizes continuous sampling of the nitrous oxide in the soil profile. The in-situ continuous collection of the nitrous oxide gas in the soil profile is convenient, and is suitable for small-scale multi-point research on different ecological systems.

[0042] The gas in the inner tube 8 prevents precipitation or snowmelt from entering the inner tube 8, and ensures normal operation of the in-situ soil profile gas collection device.

[0043] The operator regularly recovers the device, such as every half month or every month, and sends it back to the laboratory for analysis of the concentration of nitrous oxide by using a gas chromatograph or an isotope ratio mass spectrometer.

[0044] Preferably, after the insertion end of the tube body 5 is inserted into the detection hole, the operator sprinkles water on the ground near the tube body 5. The water in the ground infiltrates to make the soil on the inner wall of the detection hole adhere to the tube body 5, and improves the sealing performance of the insertion end of the tube body 5.

[0045] Preferably, after the insertion end of the tube body 5 is inserted into the detection hole, the operator piles up a soil pile with a height of 5-15 cm above the detection hole, and the exposed end of the tube body 5 is exposed to the soil pile. The operator pats and compacts the soil pile by hand, and the soil pile forms a tight sealing layer.

[0046] Preferably, the diameter of the detection hole is 20-50 mm.

[0047] Embodiment Two: as shown in Figure 2 , Figure 4 and Figure 5 , the embodiment discloses an in-situ soil profile gas collection device, which has substantially the same structure as that of Embodiment One, except that the inner wall of the strip-shaped belt 14 is fixedly installed with not less than 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-shaped belt 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.

[0048] The working process and principle of the embodiment are as follows:

[0049] The annular plate 13 makes the volume of each gas storage bag 11 close, thereby improving the reliability of the in-situ soil profile gas collection device.

[0050] Embodiment Three: as shown in Figure 1 and Figure 2 , the embodiment discloses an in-situ soil profile gas collection device, which has substantially the same structure as that of Embodiment Two, except that the embodiment further comprises a water storage container 1 and a connecting pipe 2, the support rod 6 is internally provided with a water passing cavity 15, the support rod 6 is externally provided with a connecting hole 10 connected to the water passing cavity 15, and the water passing cavity 15 and the water storage container 1 are communicated through the connecting pipe 2.

[0051] The water storage container 1 contains water, and the gas storage bag 11 closest to the inner tube 8 is communicated with the connecting hole 10.

[0052] The working process and principle of the embodiment are as follows:

[0053] When a new gas storage bag 11 is formed on the support rod 6, the newly formed gas storage bag 11 is in a negative pressure state, and the newly formed gas storage bag 11 draws water in the water storage container 1 through the water passing cavity 15 and the connecting pipe 2, so as to fill the bottom of the inner cavity of the gas storage bag 11 with water, thereby recovering the gas pressure in the gas storage bag 11, avoiding the flow of gas between the adjacent two gas storage bags 11, and avoiding the gas in the gas storage bag 11 from being drawn into the inner tube 8, thereby improving the reliability of the in-situ soil profile gas collection device.

[0054] Preferably, the water storage container 1 is a water storage bag or a water storage tank.

[0055] Embodiment Four: as shown in Figure 2 , the embodiment discloses an in-situ soil profile gas collection device, which has substantially the same structure as that of Embodiment One, except that the strip-shaped belt 14 and the tube body 5 are filled with water, and the water between the strip-shaped belt 14 and the tube body 5 submerges all the gas storage bags 11.

[0056] The working process and principle of the embodiment are as follows:

[0057] When the surface of the air bag 11 is damaged, the water between the strip 14 and the pipe 5 prevents the external air from entering the air bag 11 through the damaged part of the air bag 11, thereby improving the accuracy of the in-situ soil profile gas collection device, and the water between the strip 14 and the pipe 5 reduces the influence of the change of ground temperature on the microbial activity at the bottom of the detection hole.

[0058] Embodiment five: as shown in Figure 1 and Figure 2 , the embodiment discloses an in-situ soil profile gas collection device, which has a structure similar to that of the first embodiment, but differs from the first embodiment in that the pulling assembly comprises a motor 4 mounted on the pipe 5 through a fixing seat, a winding disc 3 is coaxially mounted on the output shaft of the motor 4, the winding disc 3 is fixedly connected with one end of a pulling rope 7, and the other end of the pulling rope 7 is connected with the position of the strip 14 away from the insertion end of the pipe 5.

[0059] The motor 4 used in the present application is a common electronic element in the prior art, and its working mode and circuit structure are known technologies, which will not be described here.

[0060] The working process and principle of the embodiment are as follows:

[0061] The operator drives the motor 4 to rotate the winding disc 3, the winding disc 3 drives the strip 14 to move through the pulling rope 7, the elastic ring 12 on the inner pipe 8 falls off from the inner pipe 8 and forms the air bag 11 of the strip 14 on the support rod 6.

[0062] Preferably, the motor 4 is a stepping motor, a servo motor or a brushless DC motor with an encoder, the motor 4 is electrically connected with an external controller, the external controller is powered by a storage battery, solar energy or wind energy, and the external controller is a single-chip microcomputer controller or an embedded controller.

[0063] Embodiment six: as shown in Figure 2 and Figure 5 , the embodiment discloses an in-situ soil profile gas collection device, which has a structure similar to that of the first embodiment, but differs from the first embodiment in that the strip 14 of the embodiment is stacked on the inner pipe 8, thereby reducing the length of the inner pipe 8 and the cost of the device.

[0064] Embodiment seven: as shown in Figure 1 , Figure 2 , the embodiment discloses an in-situ soil profile gas collection device, which has a structure similar to that of the first embodiment, but differs from the first embodiment in that a plurality of openings 9 are formed in the position of the outer periphery of the pipe 5 close to the insertion end of the pipe 5, and the openings 9 are located between the insertion end of the pipe 5 and the inner pipe 8.

[0065] The working process and principle of this embodiment are as follows:

[0066] The opening 9 improves the gas exchange efficiency between the insertion end of the tube 5 and the soil.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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 apparatus, characterized by: It comprises an inner tube (8), a tube body (5) and a strip-shaped belt (14), the tube body (5) comprises an exposed end and an insertion end, the inner tube (8) is located in the inner cavity of the tube body (5), one end of the inner tube (8) and the inner wall of the tube body (5) are detachably connected near the insertion end, the inner wall of the inner tube (8) and one end of the supporting rod (6) are connected; The outer peripheral side of the strip-shaped belt (14) is equidistantly provided with not less than three elastic rings (12), the inner diameter of the strip-shaped belt (14) is greater than the outer diameter of the inner tube (8), the strip-shaped belt (14) is sleeved on the inner tube (8), each elastic ring (12) is clamped on the outer peripheral side of the inner tube (8), and the tube body (5) is provided with a pulling assembly for moving one end of the strip-shaped belt (14). The pulling assembly moves one end of the strip-shaped belt (14), the elastic ring (12) farthest from the insertion end of the tube body (5) on the inner tube (8) is separated from the outer peripheral side of the inner tube (8), and the elastic ring (12) separated from the inner tube (8) is clamped on the outer peripheral side of the supporting rod (6). Two adjacent elastic rings (12) on the outer peripheral side of the supporting rod (6) form an air storage bag (11) on the supporting rod (6).

2. The in situ soil profile gas collection device of claim 1, wherein: The inner wall of the strip-shaped belt (14) is equidistantly provided with not less than three annular plates (13), and the elastic ring (12) and the annular plate (13) are staggered in the length direction of the strip-shaped belt (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. An in situ soil profile gas collection apparatus as claimed in claim 2, wherein: It also comprises a water storage container (1) and a connecting pipe (2), the supporting rod (6) is provided with a water passing cavity (15) therein, the outer peripheral side of the supporting rod (6) is provided with a connecting hole (10) communicating with the water passing cavity (15), and the water passing cavity (15) and the water storage container (1) are communicated through the connecting pipe (2). The water storage container (1) contains water, and the air storage bag (11) closest to the inner tube (8) is communicated with the connecting hole (10).

4. The in situ soil profile gas collection apparatus of claim 3, wherein: The strip-shaped belt (14) and the tube body (5) are filled with water, and the water between the strip-shaped belt (14) and the tube body (5) submerges all the air storage bags (11).

5. The in situ soil profile gas collection device of claim 1, wherein: The pulling assembly comprises a motor (4) mounted on the tube body (5), an output shaft of the motor (4) is provided with a winding disc (3), 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 with the strip-shaped belt (14) away from the insertion end of the tube body (5).

6. The in situ soil profile gas collection device of claim 1, wherein: The strip-shaped belt (14) is stacked and sleeved on the inner tube (8).

7. The in situ soil profile gas collection device of claim 1, wherein: A plurality of openings (9) are formed on the outer peripheral side 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).

8. The in situ soil profile gas collection device of claim 7, wherein: A tapered head (17) is mounted on the insertion end of the tube body (5).

9. The in situ soil profile gas collection device of claim 1, wherein: The inner wall of the tube body (5) and one end of a positioning tube (16) are fixedly connected, and the other end of the positioning tube (16) and one end of the inner tube (8) are detachably connected.

10. The in situ soil profile gas collection device of claim 1, wherein: The tube body (5) is made of metal or plastic.

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