Soil gas multi-point detection sampling device

Abstract

The utility model provides a soil gas multi-point detection sampling device. The soil gas multi-point detection sampling device comprises a sampling barrel, a gas conveying pipe and a gas collecting bottle, the sampling barrel is used for acquiring a gas sample; the sampling barrel is divided into a plurality of cavities, a gas inlet area is arranged on the outer wall of each cavity, and the gas inlet area is a gas inlet; the plurality of air inlet areas are respectively arranged at preset positions of the outer wall of each chamber; a gas conveying pipe is inserted into each cavity, one end of each gas conveying pipe extends upwards and then is connected with a main pipe, and the main pipe collects gas samples and then outputs the collected gas samples; a vent valve is arranged on each gas conveying pipe extending out of the sampling barrel; the gas collection bottle is used for receiving and outputting a gas sample. The gas content in the soil can be detected in real time, the growth environment of crops is detected, and normal growth of the crops is guaranteed. Gas collection and detection at different depths can be carried out on the soil at the same bottom coordinate point at the same time, the detection result is prevented from being influenced by spatial variability of the soil, and the detection precision and the detection efficiency are improved.

Description

Technical Field

[0001] The present application relates to the technical field of soil gas monitoring, and in particular to a soil gas multi-point detection and sampling device. Background Art

[0002] Against the backdrop of climate change and agricultural intensification, the soil environment in the crop root zone is undergoing dramatic changes. Under micro-irrigation or surface mulching, the ratio of soil oxygen to carbon dioxide concentration decreases, leading to temporary or persistent hypoxia in crops. Therefore, real-time monitoring of root zone gas types and concentrations is essential.

[0003] In the prior art, soil gas is monitored by using soil gas sensors. However, soil gas sensors are expensive and have high requirements for the working environment.

[0004] In addition, the physical and chemical properties of farmland soil have a high degree of spatial variability. The soil gas concentration data at different depths obtained at different locations often cannot reflect the actual situation. In particular, there is gas variability in gas monitoring at different depths at the same point, which makes it impossible to obtain the true situation of the soil, adding difficulties to subsequent maintenance.

[0005] In summary, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the existing technology. Utility Model Content

[0006] The purpose of the embodiments of the present application is to provide a soil gas multi-point detection sampling device, which can collect and detect gas at different depths of the soil at the same bottom coordinate point at the same time, avoid the impact of spatial variability of the soil on the detection results, and improve detection accuracy and efficiency.

[0007] The present application provides a soil gas multi-point detection sampling device, comprising:

[0008] A sampling tube for obtaining a gas sample; a partition is provided within the sampling tube, the partition dividing the sampling tube into a plurality of chambers, an air inlet region being provided on the outer wall of each chamber, the air inlet region being a gas inlet; the plurality of air inlet regions being provided at predetermined positions on the outer wall of each chamber, and the plurality of air inlet regions being provided at different positions;

[0009] A gas pipe is inserted into each chamber, one end of which extends upward and is connected to a main pipe, which collects and outputs the gas sample; a vent valve is provided on each gas pipe extending from the sampling cylinder;

[0010] The gas collecting bottle is connected to the gas outlet of the main pipe and is used to receive and output gas samples.

[0011] In one practicable manner, the sampling tube is a cylindrical body comprising a cylindrical side plate, a top plate and a bottom plate, and the cylindrical side plate of the sampling tube is a double-layer structure plate;

[0012] Two vertically cross-arranged partitions are arranged in the sampling cylinder, and the partitions divide the sampling cylinder into four chambers, including a first chamber, a second chamber, a third chamber and a fourth chamber.

[0013] In one practicable manner, a plurality of first air inlet areas are provided on the first chamber, a plurality of second air inlet areas are provided on the second chamber, a plurality of third air inlet areas are provided on the third chamber, and a plurality of fourth air inlet areas are provided on the fourth chamber;

[0014] The arrangement height of the first air intake zone is lower than that of the second air intake zone, the arrangement height of the second air intake zone is lower than that of the third air intake zone, and the arrangement height of the third air intake zone is lower than that of the fourth air intake zone.

[0015] In an operative manner, the first air inlet zone is arranged at a height of 5 cm, the second air inlet zone is arranged at a height of 15 cm, the third air inlet zone is arranged at a height of 30 cm, and the fourth air inlet zone is arranged at a height of 50 cm.

[0016] In one practicable manner, each air intake area includes a plurality of evenly distributed air intake holes.

[0017] In one practicable embodiment, the air inlet end of the air delivery pipe is a microporous polytetrafluoroethylene tube, the inner diameter of the air delivery pipe is 0.25 cm, and the outer diameter of the air delivery pipe is 0.30 cm.

[0018] In one practicable manner, a telescopic tube is provided on the main pipe, and the length of the telescopic tube is adjustable.

[0019] In one practicable manner, a micro-pressure differential meter and a control valve are provided on the main pipe. The micro-pressure differential meter is used to obtain and display the gas pressure in the main pipe. The control valve is communicatively connected to the micro-pressure differential meter.

[0020] In one practicable manner, the outer layer of the cylindrical side plate is provided with a waterproof layer, and the waterproof layer is a polyurethane layer, and the thickness of the polyurethane layer is 3 mm.

[0021] In one practicable manner, a dust plug is provided at the connection between the gas delivery pipe extending upward and the top plate.

[0022] The technical solution of this application can detect the gas content in the soil in real time, monitor the crop growth environment, and ensure normal crop growth. Furthermore, it can simultaneously collect and detect gas at different depths of the soil at the same bottom coordinate point, avoiding the impact of spatial soil variability on the test results and improving detection accuracy and efficiency.

[0023] By setting up a waterproof layer, while ensuring that the air in the soil can diffuse normally into the cavity, it prevents moisture from entering the sampling tube through the air inlet, ensuring normal sampling.

[0024] By setting the vent valve, single-point or multi-point detection can be selectively performed, avoiding repeated burying of the sampling tube and greatly reducing the workload.

[0025] By setting up a micro differential pressure gauge, the pressure of the gas in the main pipe can be accurately obtained to ensure the timeliness of gas detection and improve the accuracy of detection data. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a soil gas multi-point detection and sampling device according to an embodiment of the present utility model.

[0027] The description of the accompanying drawings is as follows:

[0028] 1. Sampling tube; 2. Gas pipe; 3. Air inlet area; 4. Telescopic tube; 5. Main pipe; 6. Micro-pressure differential gauge; 7. Gas collecting bottle; 8. Dust plug. DETAILED DESCRIPTION

[0029] The following is a further detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, and are not intended to limit the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0032] In addition, in the description of the present invention, unless otherwise specified, “a plurality of” means two or more.

[0033] See also Figure 1 The present application provides a soil gas multi-point detection and sampling device, comprising:

[0034] A sampling tube 1 is inserted into the sampling hole for gas sampling. A plurality of partitions are provided in the sampling tube 1, which divide the sampling tube 1 into a plurality of chambers. An air inlet area 3 is provided on the outer wall of each chamber, and the arrangement heights of the plurality of air inlet areas are different. The air inlet area 3 is a gas inlet.

[0035] Specifically, in this embodiment, the sampling tube 1 is a cylindrical cylinder, including a cylindrical side plate, a top plate and a bottom plate. Two cross-arranged partitions are arranged in the sampling tube 1, and the partitions divide the sampling tube 1 into four chambers, including a first chamber, a second chamber, a third chamber and a fourth chamber respectively; a plurality of first air inlet areas are arranged on the first chamber, a plurality of second air inlet areas are arranged on the second chamber, a plurality of third air inlet areas are arranged on the third chamber, and a plurality of fourth air inlet areas are arranged on the fourth chamber; the arrangement height of the first air inlet area is lower than the arrangement height of the second air inlet area, the arrangement height of the second air inlet area is lower than the arrangement height of the third air inlet area, and the arrangement height of the third air inlet area is lower than the arrangement height of the fourth air inlet area, and the gases at different heights in the sampling hole are sampled through the first air inlet area, the second air inlet area, the third air inlet area and the fourth air inlet area respectively.

[0036] Gas pipe 2: A gas pipe 2 is inserted into each chamber, one end of which extends upward and is connected to a main pipe 5. The main pipe 5 collects the gas sample and then outputs it;

[0037] Specifically, the inner diameter of the gas pipe 2 is 0.25 cm, and the outer diameter of the gas pipe 2 is 0.30 cm. The gas inlet end of the gas pipe 2 is a microporous polytetrafluoroethylene tube, which has the characteristics of being waterproof and breathable, and can further waterproof the gas in the sampling tube 1.

[0038] like Figure 1As shown, a first gas pipe is inserted into the first chamber, a second gas pipe is inserted into the second chamber, a third gas pipe is inserted into the third chamber, and a fourth gas pipe is inserted into the fourth chamber.

[0039] The gas collecting bottle 7 is connected to the gas outlet of the main pipe 5, and is used to receive and output gas samples, and transport the gas samples collected by the sampling cylinder 1 to the gas chromatograph for detection.

[0040] This application can effectively avoid the spatial variability problem of field gas collection and reduce the workload of gas collection. Gases at various depths can be collected through one sampling hole, thereby improving the detection accuracy of single-point detection.

[0041] In one practicable embodiment, multiple air inlet zones 3 are disposed at predetermined locations on the outer wall of each chamber. In this embodiment, the first air inlet zone is disposed at a height of 5 cm, the second air inlet zone is disposed at a height of 15 cm, the third air inlet zone is disposed at a height of 30 cm, and the fourth air inlet zone is disposed at a height of 50 cm. This application allows for the collection of gas at different depths within a single sampling hole, thereby reducing measurement errors caused by variability during collection and improving the accuracy of single-point detection and the reliability of detection data.

[0042] In one practicable manner, each air inlet area 3 includes a plurality of air inlet holes. When one or more of the air inlet holes are blocked, the remaining air inlet holes can ensure smooth air flow, thereby ensuring normal use of the device.

[0043] In one embodiment, a telescopic tube 4 is provided on the main pipe 5, and the length of the telescopic tube 4 is adjustable. By controlling the extension length of the telescopic tube 4, the height of the sampling tube 1 in the sampling hole is controlled to collect and detect gas in sampling holes at different depths.

[0044] It should be noted that by setting a scale on the telescopic tube 4, the extension length of the telescopic tube 4 can be set according to the depth of the sampling hole, thereby improving the collection efficiency.

[0045] In an practicable manner, a micro-pressure differential gauge 6 is provided on the main pipe 5 , and the micro-pressure differential gauge 6 is used to obtain and display the gas pressure in the main pipe 5 .

[0046] It should be noted that a control valve is provided on the main pipe 5 and is in communication with the micro-differential pressure meter 6. When the gas pressure detected by the micro-differential pressure meter 6 reaches a predetermined range, the control valve opens to transport the gas sample through the main pipe 5 to the gas chromatograph for testing. The provision of the micro-differential pressure meter 6 allows for accurate measurement of the gas pressure within the main pipe 5, ensuring timely gas testing and improving the accuracy of the test data.

[0047] In one feasible embodiment, a waterproof layer is provided on the outer layer of the cylindrical side plate, and the waterproof layer is a waterproof and breathable membrane. Through the provision of the waterproof and breathable membrane, the gas can be normally diffused into the sampling tube 1 while preventing moisture in the soil from entering the sampling tube 1, thereby achieving selective passage of water and gas.

[0048] Specifically, in this embodiment, the waterproof layer is a polyurethane layer, and the thickness of the polyurethane layer is 3 mm.

[0049] In one feasible method, a vent valve is provided on the gas pipe 2 extending from the sampling tube 1, and the vent valve is used to control the opening and closing of the gas pipe 2. By setting the vent valve, different gas pipes 2 can be controlled separately to supply gas, so as to realize selective collection of gas at different depths. Single-point detection or multi-point detection can be performed according to needs, so as to meet various experimental needs and improve detection efficiency.

[0050] In one practicable manner, a dust plug 8 is provided at the connection between the gas pipe 2 extending upward and the top plate of the sampling cylinder 1. The dust plug 8 can prevent the top gas from entering the sampling cylinder 1 and affecting the accuracy of the detection.

[0051] In one practicable manner, the cylindrical side panels of the sampling tube 1 are double-layer structural panels, which increase the strength of the sampling tube 1 and can prevent damage to the sampling tube 1 caused by roots, soil animals and human activities.

[0052] When using this device, a sampling hole is first opened in the soil at the location to be monitored. Multiple small rods are placed on the sidewalls of the sampling hole to press down on the surrounding soil, preventing it from falling into the hole. After adjusting the length of the telescopic tube 4 as needed, the sampling tube 1 is placed into the sampling hole to collect gas. When the gas pressure detected by the micro-differential pressure gauge 6 reaches a predetermined range, the control valve opens, transporting the gas sample through the main pipe 5 to the gas chromatograph for testing.

[0053] It should be noted that after the sampling tube 1 is placed in the sampling hole, the number of vent valves to be opened can be controlled according to detection requirements.

[0054] In summary, this application can detect the gas content in the soil in real time, monitor the crop growth environment, and ensure normal crop growth. Furthermore, it can simultaneously collect and detect gas at different depths in the soil at the same bottom coordinate point, avoiding the impact of spatial variability in the soil on the test results and improving detection accuracy and efficiency.

[0055] By setting up the waterproof layer, while ensuring that the air in the soil can diffuse into the cavity normally, it prevents moisture from entering the sampling tube 1 through the air inlet hole, thereby ensuring normal sampling.

[0056] By setting the vent valve, single-point or multi-point detection can be selectively performed, avoiding repeated burying of the sampling tube 1, and greatly reducing the workload.

[0057] By setting the micro differential pressure meter 6, the pressure of the gas in the main pipe 5 can be accurately obtained to ensure the timeliness of gas detection and improve the accuracy of detection data.

[0058] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. A soil gas multi-point detection sampling device, characterized in that: include: A sampling tube for obtaining a gas sample; a partition is provided within the sampling tube, the partition dividing the sampling tube into a plurality of chambers, an air inlet region being provided on the outer wall of each chamber, the air inlet region being a gas inlet; the plurality of air inlet regions being provided at predetermined positions on the outer wall of each chamber, and the plurality of air inlet regions being provided at different positions; A gas pipe is inserted into each chamber, one end of which extends upward and is connected to a main pipe, which collects and outputs the gas sample; a vent valve is provided on each gas pipe extending from the sampling cylinder; The gas collecting bottle is connected to the gas outlet of the main pipe and is used to receive and output gas samples.

2. The soil gas multi-point detection sampling device according to claim 1, characterized in that: The sampling tube is a cylindrical body, comprising a cylindrical side plate, a top plate and a bottom plate, wherein the cylindrical side plate of the sampling tube is a double-layer structure plate; Two vertically cross-arranged partitions are arranged in the sampling cylinder, and the partitions divide the sampling cylinder into four chambers, including a first chamber, a second chamber, a third chamber and a fourth chamber.

3. The soil gas multi-point detection sampling device according to claim 2, characterized in that: The first chamber is provided with a plurality of first air inlet areas, the second chamber is provided with a plurality of second air inlet areas, the third chamber is provided with a plurality of third air inlet areas, and the fourth chamber is provided with a plurality of fourth air inlet areas; The arrangement height of the first air intake zone is lower than that of the second air intake zone, the arrangement height of the second air intake zone is lower than that of the third air intake zone, and the arrangement height of the third air intake zone is lower than that of the fourth air intake zone.

4. The soil gas multi-point detection sampling device according to claim 3, characterized in that: The arrangement height of the first air intake zone is 5 cm, the arrangement height of the second air intake zone is 15 cm, the arrangement height of the third air intake zone is 30 cm, and the arrangement height of the fourth air intake zone is 50 cm.

5. The soil gas multi-point detection sampling device according to claim 1, characterized in that: Each air intake area includes a plurality of evenly distributed air intake holes.

6. The soil gas multi-point detection sampling device according to claim 1, characterized in that: The air inlet end of the air delivery pipe is a microporous polytetrafluoroethylene tube, the inner diameter of the air delivery pipe is 0.25 cm, and the outer diameter of the air delivery pipe is 0.30 cm.

7. The soil gas multi-point detection sampling device according to claim 1, characterized in that: A telescopic tube is provided on the main pipe, and the length of the telescopic tube is adjustable.

8. The soil gas multi-point detection sampling device according to claim 1, characterized in that: A micro-differential pressure gauge and a control valve are provided on the main pipe. The micro-differential pressure gauge is used to obtain and display the gas pressure in the main pipe. The control valve is communicatively connected with the micro-differential pressure gauge.

9. The soil gas multi-point detection sampling device according to claim 2, characterized in that: The outer layer of the cylindrical side plate is provided with a waterproof layer, which is a polyurethane layer with a thickness of 3 mm.

10. The soil gas multi-point detection sampling device according to claim 2, characterized in that: A dust plug is provided at the connection between the gas delivery pipe and the top plate after the gas delivery pipe extends upward.

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