CN210572297U

CN210572297U - Detection apparatus for soil emission gas isotope

Info

Publication number: CN210572297U
Application number: CN201921114538.XU
Authority: CN
Inventors: 董文旭; 张玉铭; 王玉英; 李晓欣; 胡春胜
Original assignee: Center for Agricultural Resources Research of Institute of Genetics and Developmental Biology of CAS
Current assignee: Center for Agricultural Resources Research of Institute of Genetics and Developmental Biology of CAS
Priority date: 2019-07-16
Filing date: 2019-07-16
Publication date: 2020-05-19
Anticipated expiration: 2029-07-16

Abstract

The utility model relates to a detection apparatus for soil discharge gas isotope, which comprises a controller, load the base of soil, the detector that has the detection sensor, the detection apparatus still includes the box, the gas outlet of base, the detection sensor all is connected with the inner chamber of box, the inner chamber of box is connected with the pressure regulating gasbag, intake pipe and blast pipe, the box is connected with the nitrogen gas replenisher with the help of the intake pipe, be connected with the outside air with the help of the blast pipe, be provided with the valve between box and the pressure regulating gasbag, be provided with the check valve on the blast pipe, this detection apparatus work does not receive space restriction, and CO in the air has effectively been avoided₂And adverse effects of pressure on detection results, and accurate measurement is realized.

Description

Detection apparatus for soil emission gas isotope

Technical Field

The utility model belongs to the technical field of soil detection equipment, concretely relates to detection device of soil emission gas isotope.

Background

The soil respiration is the process of carbon dioxide emission of soil into the atmosphere, is one of the most important processes of carbon cycle of a land ecosystem, is also the representation of life activities in the soil, and the accurate measurement of the release amount is the key for evaluating the biological process in the ecosystem. By detecting parameters related to soil respiration and its carbon isotopes, the response of root system and soil microorganisms to climate change can be estimated. Soil CO₂Flux and its¹³The C isotope abundance is influenced by various complex physical and biological processes in time and space, and the carbon flux of the soil is continuously and accurately measured for a long time, thereby having important significance for the carbon flux research of the land ecosystem.

Currently, those skilled in the art have achieved some results in the detection of soil respiration and related parameters, including the development of in-situ detection equipment for various soil carbon fluxes, which needs to be detected outside and is susceptible to CO in the outside air₂The influence of (a); the detection device which can be indoors and is not limited by position can detect collected soil, but the detection process is influenced by pressure change caused by the respiration of the soil and high background concentration in the atmosphere, and two detection devices have defects and inaccurate detection results, so that the detection device capable of overcoming the influences of the background and the pressure of the outside air is needed.

SUMMERY OF THE UTILITY MODEL

To the deficiency of the prior art, the utility model provides a detection device of soil emission gas isotope, its work is not restricted by the space, and has effectively avoided CO in the air₂And detection data errors caused by pressure, and effectively control the background concentration of the gas, thereby realizing accurate measurement.

The utility model adopts the technical proposal that:

the utility model provides a detection apparatus of soil discharge gas isotope, includes the controller, carries the base of soil, has the detector that detects the sensor, and the key lies in, this detection apparatus still includes the box, the gas outlet of base, detect the sensor and all be connected with the inner chamber of box, the inner chamber of box be connected with pressure regulating gasbag, intake pipe and blast pipe, the box is connected with the nitrogen gas replenisher with the help of the intake pipe, is connected with the outside air with the help of the blast pipe, is provided with the valve between box and the pressure regulating gasbag, is provided with the check valve on the blast pipe.

The upper end of the box body is in an open shape and is fixedly connected with the box cover by means of a connecting unit, and the connecting unit comprises a lock catch which is arranged on the box cover and the box body in a matched mode and a pressing plate which is arranged on the box body and is used for pressing the box cover.

And sealing gaskets are respectively arranged at the upper end of the box body and the lower end of the box cover.

The exhaust pipe comprises a transverse pipe and a longitudinal pipe which are perpendicular to each other, one end of the transverse pipe is connected with the inner cavity of the box body, and the one-way valve comprises an inflatable air bag which is arranged on the longitudinal pipe and matched with the other end of the transverse pipe.

And a pressure sensor is arranged in the inflatable air bag.

The exhaust pipe is also provided with a main valve.

The utility model has the advantages that: the gas outlet of the base and the detection sensor are connected with the inner cavity of the box body, the inner cavity of the box body is connected with a pressure regulating airbag, an air inlet pipe and an exhaust pipe, the box body is connected with a nitrogen gas replenisher through the air inlet pipe and is connected with the outside air through the exhaust pipe, nitrogen gas is discharged into the box body through the nitrogen gas replenisher, the air in the box body is completely replaced, and CO in the air is prevented₂The detection result is influenced; CO produced by soil respiration₂And when the gas enters the inner cavity of the box body, the gas in the box body is increased, and redundant gas enters the pressure regulating air bag to expand the pressure regulating air bag, so that the pressure in the box body is balanced with the external pressure, the real outdoor environment pressure is simulated, and the detection precision is improved.

Drawings

FIG. 1 is a schematic structural view of example 1;

FIG. 2 is a schematic view showing a state in which the case cover of embodiment 1 is opened;

FIG. 3 is a schematic view of the base and detector assembly;

FIG. 4 is a schematic view showing the assembly of the exhaust pipe and the check valve in embodiment 2;

in the attached drawing, the device comprises a base 1, a base 2, a detector 3, a box body 4, a pressure regulating air bag 5, an air inlet pipe 6, an exhaust pipe 7, a nitrogen replenisher 8, a valve 9, a one-way valve 10, a box cover 11, a lock catch 12, a pressure plate 13, a sealing washer 14, a transverse pipe 15, a longitudinal pipe 16, an inflatable air bag 17, a pressure sensor 18 and a main valve.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

Embodiment 1, as shown in fig. 1-3, a detection device of soil emission gas isotope, including controller, the base 1 that carries soil, the detector 2 that has the detection sensor, the key is, this detection device still includes box 3, the gas outlet of base 1, the detection sensor all be connected with the inner chamber of box 3, the inner chamber of box 3 be connected with pressure regulating gasbag 4, intake pipe 5 and blast pipe 6, box 3 is connected with nitrogen gas replenisher 7 with the help of intake pipe 5, is connected with the outside air with the help of blast pipe 6, is provided with valve 8 between box 3 and the pressure regulating gasbag 4, is provided with check valve 9 on the blast pipe 6. The air inlet pipe 5 is positioned at the lower end of the box body 3, and the air outlet pipe 6 is positioned at the upper end of the box body 3; the nitrogen replenisher 7 is a nitrogen bottle or a nitrogen making machine; the detection sensor comprises CO₂Sensor for detecting CO in the tank 3₂The concentration of (c).

The existing detector 2 further comprises a cover body, an interface of a detection sensor is arranged on the cover body, the cover body covers an air outlet of the base 1 for detection, in the embodiment, the base 1 and the detector 2 are both placed in the box body 3, the cover body is not required to be arranged on the air outlet of the base 1, the cover body directly rotates away from the air outlet of the base 1 and is arranged in an inner cavity of the box body 3, a wireless communication module is arranged on the detector 2, and the detection sensor is in signal connection with an external terminal and a controller by means of the wireless communication module; or, the detector 2, the external terminal and the controller are respectively provided with wire connectors, the side wall of the box body 3 is provided with wires in a penetrating way, and the detector 2 is connected with the external terminal and the controller by virtue of the wires; the base 1 is a cylinder with an opening at the upper end, soil is contained in the base 1, and gas generated by soil respiration is discharged into the inner cavity of the box body 3 from the gas outlet of the base 1; the one-way valve 9 of the exhaust pipe 6 can only exhaust air from the inner cavity of the box body 3 to the outside, and outside air cannot enter the box body 3 through the one-way valve 9.

The upper end of the box body 3 is arranged in an open shape, the box cover 10 is arranged at the upper end of the box body 3, the box body 3 is fixedly connected with the box cover 10 by means of a connecting unit, the connecting unit comprises a lock catch 11 which is arranged on the box body 10 and a pressing plate 12 which is arranged on the box body 3 and is used for pressing the box cover 10, the pressing plate 12 is of an inverted L-shaped structure, a vertical plate of the pressing plate 12 is fixedly connected with the side wall of the box body 3, a horizontal plate of the pressing plate 12 is positioned above the upper end of the box body 3, a gap is formed between the lower end surface of the pressing plate 12 and the upper end surface of the box body 3, one side of the box cover 10 enters the space between the pressing plate 12 and the box body 3; the box body 3 is of a rectangular structure, the lock catches 11 are arranged on the other three sides without the pressing plate 12, and the lock catches 11 are matched with the pressing plate 12 to enable the box body 3 and the box cover 10 to be locked and fixed. Two handles are further arranged at the upper end of the box cover 10, so that operators can carry the box cover 10 conveniently.

In which the pressure-regulating airbag 4 is mounted on the case cover 10.

3 upper ends of box, case lid 10 lower extreme are provided with seal ring 13 respectively, and hasp 11, clamp plate 12 lock box 3, case lid 10 when fastening, and seal ring 13 receives the extrusion, improves the leakproofness between box 3 and the case lid 10, the utility model discloses a seal ring 13 adopt rubber material.

In the initial state, the pressure regulating air bag 4 is in an uninflated state, and the valve is in an 8-position closing state; when the device works, the base 1 filled with soil and the detector 2 are respectively placed in the box body 1, a worker places the box cover 10 on the box body 3, and locks and fixes the box body 3 and the box cover 10 by means of the lock catch 11 and the pressing plate 13, so that an inner cavity of the box body 3 forms a closed space; opening the detector 2, opening the one-way valve 9 on the exhaust pipe 6, controlling the nitrogen gas replenisher 7 to replenish nitrogen gas into the box body 3 through the air inlet pipe 5, discharging the gas in the box body 3 along the one-way valve 9, and when a detection sensor in the detector 2 detects that the gas is in the gasDetection of CO₂When the concentration of (2) is 0, it is confirmed that the tank 3 does not contain CO₂Closing the one-way valve 9 and the nitrogen gas replenisher 7, stopping replenishing nitrogen gas into the box body 3, and simultaneously opening the valve 8;

the soil in the base 1 breathes to slowly release CO into the box 3₂And the gas in the box body 3 is increased, the pressure regulating air bag 4 is gradually filled with the gas, the difference between the pressure inside and outside the box body 3 is regulated, the gas pressure in the box body 3 simulates the real environment outside the box, soil breathes under the normal and real conditions, the distortion of detection data is prevented, and the detection sensor can obtain real and effective accurate data.

Embodiment 2 is substantially the same as embodiment 1 except that, as shown in fig. 4, the exhaust pipe 6 comprises a transverse pipe 14 and a longitudinal pipe 15 which are perpendicular to each other, one end of the transverse pipe 14 is connected with the inner cavity of the box body 3, and the check valve 9 comprises an inflatable air bag 16 which is arranged on the longitudinal pipe 15 and is matched with the other end of the transverse pipe 14; the inflatable air bag 16 is in an inflated state at the initial state, and seals the other end of the cross tube 14 to prevent the exchange of air in the box body 3 with the outside air.

When the nitrogen replenisher 7 inputs nitrogen into the box body 3, the gas in the box body 3 is increased, the air pressure is increased, pressure is generated on the inflatable air bag 16, the inflatable air bag 16 is deformed, the transverse pipe 14 is communicated with the longitudinal pipe 15, and the gas in the box body 3 is discharged to the outside; after the nitrogen replenisher 7 stops inputting nitrogen into the box body 3, the air pressure in the box body 3 is gradually reduced to be insufficient to enable the inflatable air bag 16 to deform, and the inflatable air bag 16 restores to the original state to block the transverse pipe 14; followed by CO₂Detection of (2) emission of CO into the tank 3 during soil respiration₂The gas in the tank 3 is increased to fill the pressure-regulating airbag 4.

In order to prevent the air pressure in the box body 3 from generating a difference value with the external air pressure, a pressure sensor 17 is arranged in the inflating air bag 16, a main valve 18 is also arranged on the exhaust pipe 6, when the box body 3 is inflated with nitrogen to replace air, the main valve 18 is in an open state, and when the nitrogen replenisher 7 stops working, the main valve 18 is closed to prevent the gas in the box body 3 from leaking; when the air pressure in the case 3 rises, the inflatable air bag 16 is pressed, and the inside thereofWhen the pressure rises, the pressure sensor 17 transmits a signal to the controller, and the controller judges whether the box body 3 is in the state of detecting the soil CO according to the working state of the nitrogen gas replenisher 7 and the received signal of the pressure sensor 17₂The state of flux; since nitrogen gas is not supplied at this time, the nitrogen gas supply 7 is not operated, and the controller receives a signal indicating that the pressure of the pressure sensor 17 is increased, and thus it can be determined that soil CO is being detected₂When the air pressure in the box body 3 is increased in the flux state, the controller marks or screens the detection data at the moment, so that the external terminal can record the later data as invalid data, and the increase of the air pressure to the soil CO is reduced₂And due to the influence of the flux, the detection data are always detected under the simulated air pressure, so that the accuracy of the detection data is ensured.

Further, the inflatable airbag 16 is connected to an inflator, and when the pressure sensor 17 in the inflatable airbag 16 senses that the air pressure in the inflatable airbag 16 decreases from the initial state, the controller controls the inflator to inflate the inflatable airbag 16 until the air pressure in the inflatable airbag 16 reaches the initial state.

The utility model relates to a detection apparatus for soil emission gas isotope can not receive the restriction of region, space, can gather real external environment to soil CO with soil after simulating₂And detecting the flux to realize accurate statistics of the data. Meanwhile, the detection device can also detect other gases by adding other gas sensors, such as nitrous oxide, methane or ammonia sensors.

Claims

1. The utility model provides a detection device of soil emission gas isotope, includes controller, carries the base (1) of soil, has detector (2) that detect the sensor, its characterized in that: the detection device further comprises a box body (3), the gas outlet of the base (1) and the detection sensor are connected with the inner cavity of the box body (3), the inner cavity of the box body (3) is connected with a pressure regulating air bag (4), an air inlet pipe (5) and an exhaust pipe (6), the box body (3) is connected with a nitrogen gas replenisher (7) through the air inlet pipe (5) and is connected with the outside air through the exhaust pipe (6), a valve (8) is arranged between the box body (3) and the pressure regulating air bag (4), and a check valve (9) is arranged on the exhaust pipe (6).

2. The apparatus for detecting a soil exhaust gas isotope according to claim 1, wherein: the upper end of box (3) be the setting of opening form and with the help of linkage unit and case lid (10) fixed connection, the linkage unit including supporting setting up hasp (11) on case lid (10), box (3), set up clamp plate (12) that are used for compressing tightly case lid (10) on box (3).

3. The apparatus for detecting a soil exhaust gas isotope according to claim 2, wherein: and sealing gaskets (13) are respectively arranged at the upper end of the box body (3) and the lower end of the box cover (10).

4. The apparatus for detecting a soil exhaust gas isotope according to claim 1, wherein: the exhaust pipe (6) comprises a transverse pipe (14) and a longitudinal pipe (15) which are perpendicular to each other, one end of the transverse pipe (14) is connected with the inner cavity of the box body (3), and the one-way valve (9) comprises an inflatable air bag (16) which is arranged on the longitudinal pipe (15) and matched with the other end of the transverse pipe (14).

5. The apparatus for detecting a soil exhaust gas isotope according to claim 4, wherein: a pressure sensor (17) is arranged in the inflatable air bag (16).

6. The apparatus for detecting a soil exhaust gas isotope according to claim 4, wherein: the exhaust pipe (6) is also provided with a main valve (18).