A greenhouse gas collection device for different depth soil

Abstract

The present application relates to a kind of greenhouse gas collection devices of different depth soil, including the outer tube inserted into soil layer when using, outer tube center is fixed with center column, outer tube has at least two outer tube gas collection sections spaced apart in up-down direction, outer tube gas collection section is opened with outer tube gas collection hole, center column is provided with respectively corresponding center column gas collection section with each outer tube gas collection section, center column gas collection section is provided with center column gas collection hole, center column is provided with respectively with each center column gas collection section connection center column gas collection channel, piston is arranged between each outer tube gas collection section and corresponding center column gas collection section, piston is provided with piston channel, and piston channel is connected with corresponding center column gas collection hole and outer tube gas collection hole.The present application solves the technical problem that multiple different height gas collection tubes are set in prior art, which causes the equipment to be inconvenient to carry.

Description

TECHNICAL FIELD

[0001] The present application relates to a greenhouse gas collection device capable of collecting greenhouse gases at different depths of soil. BACKGROUND

[0002] CO2, CH4 and N2O are the main greenhouse gases, and in addition to human activity emissions, terrestrial ecosystems are also important sources of emissions. In order to monitor the greenhouse gas emissions of the terrestrial ecosystem, a greenhouse gas collection device is needed to detect the greenhouse gas emission conditions of the corresponding soil layer.

[0003] Chinese patent CN102879231B discloses a "greenhouse gas collection device for different depths of soil and in-situ observation method", in which a plurality of gas collection tubes with different heights are used to collect greenhouse gases at different depths of soil. When in use, each gas collection tube is inserted into the corresponding soil layer, a gas sampling tube is arranged on each gas collection tube, and an air inlet is arranged at the bottom of the gas collection tube.

[0004] Since the heights of the gas collection tubes are different, the bottoms of the different gas collection tubes can be inserted into different depths of soil, so as to collect greenhouse gases at different depths of soil. The existing greenhouse gas collection device has the following problems: in order to collect greenhouse gases at different depths of soil, a plurality of gas collection tubes with different heights are needed, which are very inconvenient to carry; in addition, and more importantly, when collecting greenhouse gases at different depths of a certain soil layer, it is usually desired to collect greenhouse gases at different depths of soil at the same position in order to monitor the regularity of greenhouse gases. However, in the prior art, a plurality of gas collection tubes are inserted into the soil layer, and the positions of each gas collection tube inserted into the soil layer are different, and the environments of the corresponding soil layers are also different, so that it is easy to cause incorrect judgment of the regularity of soil greenhouse gas collection. SUMMARY

[0005] The present application aims to provide a greenhouse gas collection device for different depths of soil to solve the technical problem of the prior art that a plurality of gas collection tubes with different heights are arranged, which causes the device to be inconvenient to carry.

[0006] To solve the above technical problems, the technical scheme of a greenhouse gas collection device for different depths in the present application is as follows:

[0007] The greenhouse gas collection device of different depth soil comprises an outer tube inserted into a soil layer during use, a center column fixed in the center of the outer tube, the outer tube has at least two outer tube gas collection sections arranged in the up-down direction, the outer tube gas collection section is provided with an outer tube gas collection hole, the center column is provided with a center column gas collection section corresponding to each outer tube gas collection section, the center column gas collection section is provided with a center column gas collection hole, the center column is provided with a center column gas collection channel connected with each center column gas collection section, and each outer tube gas collection section and the corresponding center column gas collection section are provided with a piston.

[0008] Further, the outer tube gas collection section and the center column gas collection section are three, the center column gas collection channel is three, each center column gas collection channel comprises an axial channel arranged along the center column axial direction and a radial channel arranged along the center column radial direction, the end of the radial channel away from the axial channel is connected with the corresponding center column gas collection hole, the center column axial channel is three, and each center column axial channel is uniformly and spacedly arranged along the center column circumferential direction.

[0009] Further, the piston is annular structure, the inner circumferential surface of the piston is in guided and sealed sliding fit with the outer circumferential surface of the center column, the outer circumferential surface of the piston is in guided and sealed sliding fit with the inner wall of the outer tube, the axial length of the piston is less than the axial length of the corresponding outer tube gas collection section and center column gas collection section, and the piston driving mechanism for driving the corresponding piston to reciprocate along the axial direction of the center column is arranged between the center column and the outer tube.

[0010] Further, the piston driving mechanism comprises a telescopic rod connected with the corresponding piston, the telescopic rod between adjacent pistons, one end of the telescopic rod is connected with one of the pistons, and the other end of the telescopic rod is connected with the other piston, the top plate is fixed on the upper end of the center column and the outer tube, and the uppermost telescopic rod is arranged between the top plate and the uppermost piston.

[0011] Further, the center column is provided with an annular groove corresponding to each center column gas collection section, the inner side of each outer tube gas collection hole on the corresponding outer tube gas collection section is connected with the corresponding annular groove, and the annular groove is connected with the corresponding center column gas collection channel.

[0012] Further, the inner side hole of each outer tube gas collection hole is provided with an outer tube air inlet valve, the outer tube air inlet valve comprises an outer tube air inlet valve plate and an outer tube spring for applying an inward force to the outer tube air inlet valve plate to force the outer tube air inlet valve to close the outer tube gas collection hole; the outer side hole of each center column gas collection hole is provided with a center column air inlet valve, the center column air inlet valve comprises a center column air inlet valve plate and a center column spring for applying an outward force to the center column air inlet valve plate to force the center column air inlet valve to close the center column gas collection hole, the outer periphery of the piston is provided with an outer side elastic protrusion for pushing the corresponding outer tube air inlet valve plate to move outward to open the corresponding outer tube gas collection hole, the inner periphery of the piston is provided with an inner side elastic protrusion for pushing the corresponding center column air inlet valve plate to move inward to open the corresponding center column gas collection hole, the outer end of the piston channel extends to the outer periphery of the outer side elastic protrusion, and the inner end of the piston channel extends to the outer periphery of the inner side elastic protrusion.

[0013] Further, the outer side elastic protrusion and the inner side elastic protrusion are both made of rubber material.

[0014] Further, the outer side elastic protrusion and the inner side elastic protrusion are both in a ball head structure, the ball top of the ball head structure is used for pushing the corresponding air inlet valve plate, and the channel opening of the piston channel extends to the spherical surface outside the ball top.

[0015] The beneficial effects of the present application are: in the present application, the outer tube and the center column are provided, the outer tube is inserted into the soil during use, at least two outer tube gas collection sections are arranged on the outer tube in the up-down direction, each outer tube gas collection section is provided with an outer tube gas collection hole, the outer tube gas collection sections at different heights can collect greenhouse gases in corresponding depth soil layers, the piston channel in the piston guides the greenhouse gases collected at corresponding depths to the center column gas collection hole of the corresponding center column gas collection section, and then the greenhouse gases are led out through the corresponding center column gas collection channel, so that the greenhouse gases in the same position and different depth soil layers can be collected through one collection tube, and the equipment is convenient to carry. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, which show, by way of example, several embodiments of the present disclosure. In the drawings, like reference numerals designate like elements or parts throughout the several views, wherein:

[0017] Figure 1 is a structural schematic diagram of one embodiment of the present application;

[0018] Figure 2 is a top view of the center column;

[0019] Figure 3 is Figure 1 is an enlarged view of A in

[0020] Figure 4 is Figure 1 the structure of the outer tube;

[0021] Figure 5 is Figure 1 the structure of the center column;

[0022] Figure 6 is Figure 4 the enlarged view of B in FIG. 2;

[0023] Figure 7 is Figure 5 the enlarged view of C in FIG. 2;

[0024] Figure 8 is Figure 3 the cooperation between the piston channel and the outer elastic protrusion and the outer tube air inlet valve valve plate in FIG. 2;

[0025] BRIEF DESCRIPTION OF DRAWINGS 1. outer tube; 2. center column; 3. top plate; 4. first outer tube gas collection section; 5. second outer tube gas collection section; 6. third outer tube gas collection section; 7. outer tube gas collection hole; 8. outer tube air inlet valve valve plate; 9. outer tube spring; 10. center column gas collection channel; 10-1. axial channel; 10-2. radial channel; 11. annular groove; 12. first center column gas collection section; 13. second center column gas collection section; 14. third center column gas collection section; 15. center column gas collection hole; 16. center column sleeve; 17. center column body; 18. center column spring; 19. center column air inlet valve valve plate; 20. first piston; 21. second piston; 22. third piston; 23. telescopic rod; 24. piston channel; 25. outer elastic protrusion; 26. channel opening of the piston channel;

[0026] Figure 1 the arrow direction represents the gas flow direction in FIG. 2. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present application, the present application will be described in more detail below in conjunction with the drawings and specific embodiments. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0028] It should be noted that unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application.

[0029] An embodiment of the greenhouse gas collection device for different depth soil in the present application is shown in the figure Figures 1-8 The greenhouse gas collection device includes an outer tube 1 for insertion into the soil layer during use, a top plate 3 fixed to the top of the outer tube 1, and a tapered tip at the bottom of the outer tube 1. The greenhouse gas collection device also includes a central column 2 concentrically arranged with the outer tube, the bottom of the central column 2 is fixed to the tapered tip, and the upper end of the central column is fixed to the top plate.

[0030] The outer tube has three outer tube gas collection sections arranged in the up-down direction, the three outer tube gas collection sections in this embodiment are a first outer tube gas collection section 4, a second outer tube gas collection section 5, and a third outer tube gas collection section 6 from top to bottom, and a plurality of outer tube gas collection holes 7 are distributed on each outer tube gas collection section. The outer tube gas collection holes penetrate the outer tube wall in the radial direction, in this embodiment, the side close to the center line of the outer tube in the radial direction is called the inner side, and the side away from the center line of the outer tube is called the outer side.

[0031] The outer tube gas collection holes distributed on each outer tube gas collection section form a multi-ring structure arranged in the up-down direction, each ring of outer tube gas collection holes includes a plurality of outer tube gas collection holes arranged in the circumferential direction, and the up-down direction length of each outer tube gas collection section is 30 cm.

[0032] The central column is provided with central column gas collection sections corresponding to each outer tube gas collection section, the three central column gas collection sections are a first central column gas collection section 12, a second central column gas collection section 13, and a third central column gas collection section 14 from top to bottom, and the height of each central column gas collection section is the same as the height of the corresponding outer tube gas collection section. In this embodiment, the central column includes a central column body 17, annular grooves 11 corresponding to each central column gas collection section are formed on the central column body, a central column sleeve 16 is fixed to the periphery of the annular grooves 11, and the central column sleeve 16 corresponds to the central column gas collection sections.

[0033] A plurality of central column gas collection holes 15 are distributed on each central column gas collection section, the distribution form of the central column gas collection holes 15 is similar to that of the outer tube gas collection holes, a plurality of central column gas collection holes arranged in the up-down direction are distributed on each central column gas collection section, each ring of central column gas collection holes includes a plurality of central column gas collection holes arranged in the circumferential direction, and the inner side of each central column gas collection hole is connected to the corresponding annular groove 11.

[0034] The central column is provided with central column gas collection channels 10 connected with corresponding annular grooves respectively, and the central column gas collection channels are connected with corresponding central column gas collection holes through the annular grooves. In the embodiment, there are three annular grooves, and therefore there are three central column gas collection channels. Each central column gas collection channel includes an axial channel 10-1 arranged along the axial direction of the central column and a radial channel 10-2 arranged along the radial direction of the central column. The radial channel is connected with the corresponding central column gas collection hole through the annular groove at the end away from the axial channel. There are three central column axial channels, and each central column axial channel 10-1 is uniformly and spacedly arranged along the circumferential direction of the central column.

[0035] Each outer tube gas collection section is provided with a piston between it and the corresponding central column gas collection section. The piston is provided with a piston channel connecting the outer tube gas collection hole and the corresponding central column gas collection hole. The three pistons from top to bottom can be referred to as the first piston 20, the second piston 21 and the third piston 22.

[0036] In the embodiment, the piston has an annular structure. The inner circumferential surface of the piston is in guided and sealed sliding fit with the outer circumferential surface of the central column, the outer circumferential surface of the piston is in guided and sealed sliding fit with the inner wall of the outer tube, the axial length of the piston is less than the axial length of the corresponding outer tube gas collection section and central column gas collection section, and the axial height of the piston is 5cm-10cm. The central column is provided with a piston driving mechanism for driving the corresponding piston to reciprocate along the axial direction of the central column.

[0037] The piston driving mechanism includes a telescopic rod 23 connected with the corresponding piston. In the embodiment, the telescopic rod is an electric push rod (pneumatic rod or hydraulic rod). The telescopic rod between two adjacent pistons has one end connected with one of the pistons and the other end connected with the other piston. The uppermost telescopic rod is arranged between the top plate and the uppermost piston.

[0038] Each outer tube gas collection hole is provided with an outer tube air inlet valve at the inner side hole opening. The outer tube air inlet valve includes an outer tube air inlet valve plate and an outer tube spring 9 for applying an inward force to the outer tube air inlet valve plate to force the outer tube air inlet valve to close the outer tube gas collection hole. The outer tube air inlet valve plate can float in the inward and outward directions under the action of the outer tube spring.

[0039] Each central column gas collection hole is provided with a central column air inlet valve at the outer side hole opening. The central column air inlet valve includes a central column air inlet valve plate and a central column spring 18 for applying an outward force to the central column air inlet valve plate to force the central column air inlet valve to block the corresponding central column gas collection hole. The central column air inlet valve plate can float in the inward and outward directions under the action of the central column spring.

[0040] The outer peripheral surface of the piston is provided with an outer elastic protrusion 25 for pushing the valve plate of the corresponding outer pipe intake valve outward to open the corresponding outer pipe gas collection hole, and the inner peripheral surface of the piston is provided with an inner elastic protrusion for pushing the valve plate of the corresponding central column intake valve inward to open the corresponding central column gas collection hole, the outer end of the piston channel 24 extends to the outer peripheral surface of the outer elastic protrusion, and the inner end of the piston channel 24 extends to the outer peripheral surface of the inner elastic protrusion.

[0041] In this embodiment, the outer elastic protrusion and the inner elastic protrusion are both made of rubber material, and the outer elastic protrusion will be pushed up from the outer peripheral surface of the piston only when it reaches the position of the outer pipe intake valve plate, and when it does not encounter the outer pipe intake valve plate, it will be extruded between the piston and the inner wall of the outer pipe under the extrusion action of the outer pipe inner wall. Similarly, the inner elastic protrusion will be pushed up from the inner peripheral surface of the piston only when it reaches the position of the central column intake valve plate, and when it does not encounter the central column intake valve plate, it will be extruded between the piston and the outer peripheral surface of the central column under the extrusion action of the outer peripheral surface of the central column.

[0042] As shown in Figure 8 , the outer elastic protrusion and the inner elastic protrusion are both in a ball head structure, the ball top of the ball head structure is used to push the corresponding intake valve plate, and the channel opening 26 of the piston channel extends to the spherical surface outside the ball top.

[0043] In use, the outer pipe is inserted into the corresponding soil, i.e. soil layer, and the three outer pipe gas collection sections can collect greenhouse gases at three different heights of the soil, specifically, the flow path of the greenhouse gases is that the greenhouse gases flow out through the outer pipe gas collection hole, the piston channel, the central column gas collection hole, the annular groove and the corresponding central column gas collection channel to be collected. Another feature of the present application is that the present application not only realizes the collection of greenhouse gases at three different height sections, but also realizes the collection of greenhouse gases at a certain height in the corresponding height section by adjusting the height of the piston, for example, adjusting the height of the piston in the corresponding outer pipe gas collection section, the outer pipe gas collection hole corresponding to the piston is closed by the outer pipe intake valve, the central column gas collection hole corresponding to the piston is closed by the central column intake valve, the valve plate of the outer pipe gas collection hole corresponding to the piston is pushed open by the outer elastic protrusion, and the valve plate of the central column gas collection hole corresponding to the piston is pushed open by the inner elastic protrusion. The greenhouse gases in the corresponding height soil layer can be collected through the corresponding outer pipe gas collection hole, the piston channel, the central column gas collection hole, the annular groove and the central column gas collection channel, the collection height is particularly diverse, and various collection height requirements can be met.

[0044] In the above description of the present specification, unless otherwise explicitly specified and limited, the terms "fixed", "mounted", "connected" or "linked" and the like should be understood in a broad sense. For example, as to the term "connected", it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium, or it can be internal connection of two elements or interaction relationship between two elements. Therefore, unless otherwise explicitly limited in the present specification, the above terms can be understood in the specific meaning in the present application by the person skilled in the art according to the specific circumstances.

[0045] According to the above description of the present specification, the person skilled in the art can also understand the terms used as follows, for example, the terms indicating the orientation or positional relationship such as "upper", "lower", "front", "rear", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "center", "longitudinal", "transverse", "clockwise" or "counterclockwise" are based on the orientation or positional relationship shown in the drawings of the present specification, which are only for the purpose of facilitating the description of the present application and simplifying the description, and are not explicitly or implicitly indicated that the devices or elements involved must have the specific orientation, be constructed and operated in the specific orientation, therefore the above orientation or positional relationship terms cannot be understood or interpreted as a limitation on the present application.

[0046] In addition, the terms "first" or "second" and the like used in the present specification are terms used to refer to numbers or ordinal numbers only for the purpose of description, and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" or "second" can explicitly or implicitly include at least one of the features. In the description of the present specification, the meaning of "plurality" is at least two, for example, two, three or more, etc., unless otherwise explicitly specified and limited.

[0047] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A greenhouse gas collection apparatus for different depths of soil, characterized by: The invention discloses a gas collecting device, which comprises an outer tube inserted into soil layer during use, a center column fixed in the center of the outer tube, at least two outer tube gas collecting sections of the outer tube arranged in the up-down direction, outer tube gas collecting holes opened on the outer tube gas collecting sections, center column gas collecting sections arranged on the center column corresponding to the outer tube gas collecting sections, center column gas collecting holes arranged on the center column gas collecting sections, center column gas collecting channels arranged in the center column corresponding to the center column gas collecting sections, pistons arranged between the outer tube gas collecting sections and the corresponding center column gas collecting sections, piston channels arranged in the pistons connecting the outer tube gas collecting holes and the corresponding center column gas collecting holes, the pistons being annular structures, the inner circumferential surface of the piston being in guided and sealed sliding fit with the outer circumferential surface of the center column, the outer circumferential surface of the piston being in guided and sealed sliding fit with the inner wall of the outer tube, the axial length of the piston being smaller than the axial length of the corresponding outer tube gas collecting section and center column gas collecting section, the piston driving mechanism arranged between the center column and the outer tube driving the corresponding piston to move along the center column in the axial direction, the inner side hole of each outer tube gas collecting hole being provided with an outer tube air inlet valve, the outer tube air inlet valve comprising an outer tube air inlet valve plate and an outer tube spring applying an inward force to the outer tube air inlet valve plate to force the outer tube air inlet valve to close the outer tube gas collecting hole, the outer side hole of each center column gas collecting hole being provided with a center column air inlet valve, the center column air inlet valve comprising a center column air inlet valve plate and a center column spring applying an outward force to the center column air inlet valve plate to force the center column air inlet valve to close the center column gas collecting hole, the outer circumferential surface of the piston being provided with an outer side elastic protrusion for pushing the corresponding outer tube air inlet valve plate to move outward to open the corresponding outer tube gas collecting hole, the inner circumferential surface of the piston being provided with an inner side elastic protrusion for pushing the corresponding center column air inlet valve plate to move inward to open the corresponding center column gas collecting hole, the outer end of the piston channel extending to the outer circumferential surface of the outer side elastic protrusion, the inner end of the piston channel extending to the outer circumferential surface of the inner side elastic protrusion, the outer side elastic protrusion and the inner side elastic protrusion both being spherical head structures, the spherical top of the spherical head structure being used for pushing the corresponding air inlet valve plate, the channel opening of the piston channel extending to the spherical surface surrounding the spherical top, the channel opening of the piston channel avoiding the spherical top of the spherical head structure.

2. The greenhouse gas collection device of claim 1, wherein: The outer tube gas collecting section and the center column gas collecting section each have three, the center column gas collecting channel has three, each center column gas collecting channel comprises an axial channel arranged along the center column axial direction and a radial channel arranged along the center column radial direction, the end of the radial channel away from the axial channel is connected with the corresponding center column gas collecting hole, the center column axial channel has three, each center column axial channel is uniformly and spacedly arranged along the center column circumferential direction.

3. The greenhouse gas collection device of claim 1, wherein: The piston driving mechanism comprises telescopic rods connected with the corresponding pistons, the telescopic rods between the adjacent pistons, one end of the telescopic rod being connected with one of the pistons, the other end of the telescopic rod being connected with the other piston, the top plate being fixed on the center column and the upper end of the outer tube, the uppermost telescopic rod being arranged between the top plate and the uppermost piston.

4. The greenhouse gas collection device of claim 1, wherein: The center column is provided with annular grooves corresponding to the gas collection sections of the center column, and the inner side of each gas collection hole on the outer pipe gas collection section is connected with a corresponding annular groove, and the annular groove is connected with a corresponding center column gas collection channel.

5. The greenhouse gas collection device of claim 1, wherein: The outer side elastic protrusion and the inner side elastic protrusion are both made of rubber material.

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