CN221302908U - A soil N2O gas collection device - Google Patents

Abstract

The utility model discloses a soil _N2O gas collection device, and relates to the technical field of gas collection devices. Its structure includes a base and a box; a sealing ring is provided at the connection between the base and the box; an air guide tube is fixedly penetrated at the upper end of the box; a ball valve is installed on the air guide tube; a barometer is threadedly penetrated and connected to the upper end of the box; a round tube is fixedly penetrated at the upper end of the box; and a rubber plug is plugged at the end of the round tube. The utility model is conveniently and quickly installed in the soil and seals the box containing _N2O gas through the combination of the base, the box, and the sealing ring. The provided round tube and rubber plug facilitate the use of a syringe to collect the gas in the box for inspection. The provided air guide tube, ball valve, and barometer facilitate the final extraction of all the gas in the box for inspection. The overall sealing effect is good, and the sample gas in the box is collected in time periods. The gas sample collection process is accurate and reliable without external air mixing.

Description

A soil N2O gas collection device

Technical Field

The utility model belongs to the technical field of gas collection devices, in particular to a soil _N2O gas collection device.

Background technique

Nitrous oxide (N ₂ O) is one of the important greenhouse gases in the atmosphere. The global warming potential of N ₂ O is 298 times that of CO _2. In addition, N ₂ O is the substance that depletes stratospheric ozone the most. The content of N ₂ O in the atmosphere is increasing and will continue to increase, which has attracted the attention of governments and scientists in various countries. Agricultural soil is an important source of atmospheric N ₂ O emissions. The trace greenhouse gas N ₂ O in the soil is in a dynamic state of change. Mitigating greenhouse gas N ₂ O emissions is a major challenge facing human society today. By collecting soil N ₂ O and studying the flux, process, and mechanism of N ₂ O gas emissions in the soil, we can provide a scientific basis and data support for the reduction of greenhouse gas N ₂ O emissions. Among them, the utility model patent with the authorization announcement number CN208688884U discloses a soil _N2O gas collection device, which includes a base and a box body, with an annular water tank set at the top; the lower end of the box body is open and buckled on the base; the top of the box body is connected to a plastic tube for extracting _N2O gas in the box body, and a fan is fixedly installed on the inner side wall of the box body by bolts, which is used to mix the _N2O gas in the box body during sampling. It uses a plastic tube to connect the sample gas inside the box body, and the plastic tube is connected to the outside air. When the sample air is extracted, some air is mixed in, which has the problem of causing the mixed air detection data to deviate from the actual. In order to solve the above technical problems, this application document provides a soil _N2O gas collection device.

Utility Model Content

The utility model aims to provide a soil _N2O gas collection device, which has good overall sealing effect through the combination of a base, a box, a sealing ring, an air guide tube, a ball valve, a barometer, a round tube and a rubber plug, collects sample gas in the box in time periods, and no external air is mixed in the process of collecting gas samples.

In order to solve the above technical problems, the utility model is achieved through the following technical solutions:

The utility model discloses a soil _N2O gas collection device, comprising a base and a box body; a sealing ring is arranged at the connection between the base and the box body; an air guide pipe is fixedly passed through the upper end of the box body; a ball valve is installed on the air guide pipe; a barometer is threadedly passed through the upper end of the box body and connected; a round tube is fixedly passed through the upper end of the box body; and a rubber plug is plugged at the end of the round tube.

As a preferred technical solution of the utility model, the base includes a circular ring plate; the upper surface of the circular ring plate is provided with a coaxially arranged first ring cylinder, a second ring cylinder and a third ring cylinder; the sealing ring is sleeved on the second ring cylinder, and the opening end of the sealing ring is provided with an inner ring extension and an outer ring extension; the inner ring extension is placed between the first ring cylinder and the second ring cylinder; the outer ring extension is placed between the second ring cylinder and the third ring cylinder; the lower surface of the circular ring plate is provided with a fourth ring cylinder for inserting into the soil.

As a preferred technical solution of the utility model, the box body includes an annular cover body with a lower opening; an annular plate is fixed to the circumferential side surface of the lower end portion of the annular cover body; a fifth ring cylinder is fixed to the circumferential side surface of the annular plate, and the lower end of the fifth ring cylinder is flush with the lower end of the annular cover body; the inner ring surface of the fifth ring cylinder and the outer ring surface of the annular cover respectively cooperate with the two vertical ring surfaces of the sealing ring; the lower end of the fifth ring cylinder and the lower end of the annular cover body are respectively abutted against the outer ring edge and the inner ring edge.

As a preferred technical solution of the utility model, at least four handle rings are fixed to the upper surface of the circular ring plate.

As a preferred technical solution of the present utility model, the base is made of stainless steel.

As a preferred technical solution of the utility model, the outer wall of the box is wrapped with an insulation layer, which isolates the temperature inside and outside the box, avoids the fluctuation of the internal air pressure of the box caused by the large fluctuation of the external temperature, and ensures the stable release of _N2O gas from the soil.

The utility model has the following beneficial effects:

1. The utility model can be quickly and conveniently installed in the soil and seal the box containing _N2O gas through the combination of the base, the box and the sealing ring. The provided round tube and rubber plug can conveniently use a syringe to collect the gas in the box for inspection. The provided air guide pipe, ball valve and pressure gauge can conveniently extract all the gas in the box for inspection.

2. The combination of the base, box body and sealing ring of the utility model is fixed and stable in the soil, has good connection and sealing effect, and is easy to install and remove.

3. The utility model collects the gas in the box through a syringe, without any external air mixing in, and the collected gas samples are accurate and reliable.

Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

FIG1 is a schematic diagram of the structure of the soil N ₂ O gas collection device of the present invention.

FIG. 2 is a front view of the utility model.

Fig. 3 is a cross-sectional view taken along line A-A in Fig. 2 .

FIG. 4 is a partial enlarged view of point A in FIG. 3 .

FIG. 5 is a partial enlarged view of point B in FIG. 3 .

FIG. 6 is a schematic structural diagram of the base.

FIG. 7 is a schematic structural diagram of a box body.

FIG8 is a schematic diagram of the structure of the sealing ring.

In the accompanying drawings, the components represented by the reference numerals are listed as follows:

1-base, 2-box, 3-sealing ring, 4-air guide tube, 5-ball valve, 6-pressure gauge, 7-round tube, 8-rubber plug, 11-circular ring plate, 12-first ring cylinder, 13-second ring cylinder, 14-third ring cylinder, 15-fourth ring cylinder, 16-handle ring, 21-annular cover, 22-annular plate, 23-fifth ring cylinder.

Detailed ways

The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

Specific embodiment one:

Please refer to Figures 1-8, the utility model is a soil _N2O gas collection device, including a base 1 and a box 2. A sealing ring 3 is provided at the connection between the base 1 and the box 2. An air guide tube 4 is fixedly passed through the upper end of the box 2. A ball valve 5 is installed on the air guide tube 4. A barometer 6 is threadedly passed through the upper end of the box 2. A round tube 7 is fixedly passed through the upper end of the box 2. A rubber plug 8 is plugged at the end of the round tube 7.

Among them, the base 1 specifically includes a circular ring plate 11. The upper surface of the circular ring plate 11 is provided with a first ring tube 12, a second ring tube 13 and a third ring tube 14 which are coaxially arranged. The sealing ring 3 is sleeved on the second ring tube 13, and the opening end of the sealing ring 3 is provided with an inner ring extension and an outer ring extension. The inner ring extension is placed between the first ring tube 12 and the second ring tube 13. The outer ring extension is placed between the second ring tube 13 and the third ring tube 14. The lower surface of the circular ring plate 11 is provided with a fourth ring tube 15 for inserting into the soil. The box body 2 specifically includes an annular cover body 21 with a lower opening. An annular plate 22 is fixed to the peripheral side surface of the lower end of the annular cover body 21. A fifth ring tube 23 is fixed to the peripheral side surface of the annular plate 22, and the lower end of the fifth ring tube 23 is flush with the lower end of the annular cover body 21. The inner ring surface of the fifth ring tube 23 and the outer ring surface of the annular cover body 21 are respectively matched with the two vertical ring surfaces of the sealing ring 3. The lower end of the fifth ring tube 23 and the lower end of the annular cover body 21 are respectively in contact with the outer ring edge and the inner ring edge.

When installing the soil _N2O gas collection device, first take the base 1 and insert the fourth ring tube 15 at its lower end into the soil until the annular plate 11 contacts the soil. Install the sealing ring 3 on the second ring tube 13, take the box 2 and insert the lower end of the annular cover 21 and the lower end of the fifth ring tube 23 between the first ring tube 12, the second ring tube 13 and the third ring tube 14 respectively. The lower end of the fifth ring tube 23 and the lower end of the annular cover 21 are respectively in contact with the outer ring edge and the inner ring edge, and the inner ring surface of the fifth ring tube 23 and the outer ring surface of the annular cover 21 are tightly matched with the inner and outer ring surfaces of the sealing ring 3. The sealing ring 3 forms a stable seal between the base 1 and the box 2. At this time, open the ball valve 5, and the pressure inside the box 2 is balanced with the external air pressure.

This application document uses a syringe to extract and collect samples from the space inside the box 2. When extracting, the air in the syringe is emptied, the injection needle is passed through the rubber stopper 8, and the piston rod is pulled back and forth multiple times. Finally, the full tube of sample gas is extracted, the injection needle is pulled out from the rubber stopper 8, and the front end of the syringe is sealed with a rubber cap for laboratory testing. The following part will not repeat the process of extracting gas samples with a syringe.

When extracting gas samples for the first time, after the box 2 is installed, use a syringe to take two syringes of gas samples.

Gas samples were extracted at different time periods. After the box 2 was installed, two syringes of gas samples were taken every 2 hours using a syringe.

Finally, the gas sample is extracted. The tools include a vacuum bottle, a vacuum pump and a connecting pipe. The connecting pipe connects the air guide pipe 4, the vacuum pump and the vacuum bottle. Open the ball valve 5 to start the vacuum pump, and draw all the air in the box 2 into the vacuum bottle. When the pointer of the barometer 6 reaches a near-vacuum state, close the ball valve 5, the vacuum pump and the valve on the vacuum bottle. After removing the connecting pipe, open the ball valve 5 to allow air to enter the box 2 again, and then the base 1 and the box 2 can be easily removed.

Among them, at least four handle rings 16 are fixed on the upper surface of the circular plate 11, which facilitates the removal of the base 1 from the soil. The base 1 is made of 304 stainless steel with high overall strength and good structural stability. The base 1 is made of stainless steel to contact the soil to reduce the corrosion of the soil to the device itself, and stainless steel is used for easy cleaning.

The outer wall of the box 2 is wrapped with a heat-insulating layer, which isolates the temperature inside and outside the box 2, avoids the fluctuation of the internal air pressure of the box 2 caused by the large fluctuation of the external temperature, and ensures the stable release of _N2O gas from the soil.

In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims (6)

1. Soil N ₂ O gas collection system, its characterized in that:

Comprises a base (1) and a box body (2);

A sealing ring (3) is arranged at the joint of the base (1) and the box body (2);

An air duct (4) is fixedly penetrated at the upper end of the box body (2); a ball valve (5) is arranged on the air duct (4);

The upper end of the box body (2) is connected with a barometer (6) in a threaded penetrating way;

The upper end of the box body (2) is fixedly penetrated by a circular tube (7); a rubber plug (8) is plugged at the end part of the round tube (7).

2. The soil N ₂ O gas collection device according to claim 1, wherein the base (1) comprises a circular plate (11); the upper surface of the annular plate (11) is provided with a first annular cylinder (12), a second annular cylinder (13) and a third annular cylinder (14) which are coaxially arranged; the sealing ring (3) is sleeved on the second ring barrel (13), and an inner ring extension and an outer ring extension are arranged at the opening end of the sealing ring (3); the inner ring extension is arranged between the first ring cylinder (12) and the second ring cylinder (13); the outer ring extension is arranged between the second ring cylinder (13) and the third ring cylinder (14); the lower surface of the annular plate (11) is provided with a fourth annular cylinder (15) for being inserted into soil.

3. The soil N ₂ O gas collection device according to claim 2, wherein the tank (2) comprises a lower open annular cover (21); an annular plate (22) is fixed on the peripheral side surface of the lower end part of the annular cover body (21); a fifth ring cylinder (23) is fixed on the peripheral side surface of the annular plate (22), and the lower end of the fifth ring cylinder (23) is flush with the lower end of the annular cover body (21); the inner annular surface of the fifth annular cylinder (23) and the outer annular surface of the annular cover body (21) are respectively matched with the two vertical annular surfaces of the sealing ring (3); the lower end of the fifth ring cylinder (23) and the lower end of the annular cover body (21) are respectively abutted with the outer ring extension edge and the inner ring extension edge.

4. A soil N ₂ O gas collection device according to claim 3, characterised in that the upper surface of the annular plate (11) is fixed with at least four handle rings (16).

5. The soil N ₂ O gas collection device according to claim 1, wherein the base (1) is made of 304 stainless steel.

6. The soil N2O gas collection device according to claim 1, wherein the outer wall of the box body (2) is wrapped with a heat insulation layer.