One-way conducting structure and farmland gas collecting device

Abstract

The application provides a one-way conduction structure and a farmland gas collecting device, relates to the technical field of gas collection, and comprises a main flow channel, a containing cavity and an island column, the containing cavity is arranged on one side or both sides of the main flow channel, the containing cavity is communicated with the main flow channel, the island column is arranged in the containing cavity, the island column is fixedly connected with the output end of a lifting driving mechanism, the lifting direction of the output end of the lifting driving mechanism is perpendicular to the plane where the main flow channel and the containing cavity are located, when the island column is in a lifting state, a branch flow channel communicated with the main flow channel is formed in the containing cavity, and the main flow channel and the branch flow channel form a Tesla fluid one-way channel; the one-way conduction structure does not have a minimum opening pressure, and is more convenient to use; and by driving different numbers of island columns to be lifted through the lifting driving mechanism, the check pressure of the one-way conduction structure can be adjusted, and then the gas collecting conditions of different pressure differences can be adapted, so that the check effect is ensured, and the adaptability to different gas collecting working conditions is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas collection, in particular to a one-way conduction structure and a farmland gas collection device. BACKGROUND

[0002] At present, the conventional collection of farmland carbon emission gas is basically to place an enrichment box above a plant, to close the area of the plant, and to extract the gas in the box after a certain time to take it back to the laboratory for analysis. This method is mainly to prevent the airflow disturbance caused by the low-altitude wind shear of the farmland from affecting the collection of the gas. During the extraction of the gas, a gas container, a gas pump and a one-way valve are usually needed, wherein the one-way valve is arranged at the gas inlet of the gas container and is used to prevent the high-pressure gas in the gas container from flowing back and leaking. However, the one-way valve has a certain minimum opening pressure, that is, the one-way valve can be conducted when the inlet pressure reaches a certain value. When the extraction pressure is very small, it is difficult for the one-way valve to be conducted. Moreover, the cut-off pressure of the one-way valve is fixed and cannot be adjusted according to the pressure difference between the inside and outside of the gas container, so there is a possibility of being broken by the cut-off pressure.

[0003] Therefore, it is necessary to develop a one-way conduction structure to solve the above technical problems. SUMMARY

[0004] The purpose of the present application is to provide a one-way conduction structure and a farmland gas collection device to solve the problems existing in the prior art. The one-way conduction structure does not have a minimum opening pressure and is more convenient to use. Moreover, the reverse stop pressure of the one-way conduction structure can be adjusted by the lifting drive mechanism driving different numbers of island columns to rise, thereby adapting to different pressure difference gas collection conditions, so as to not only ensure the reverse stop effect, but also improve the adaptability to different gas collection working conditions.

[0005] To achieve the above purpose, the present application provides the following solutions:

[0006] A one-way conduction structure, comprising a main flow channel, a containing cavity and an island column, the containing cavity is arranged on one side or both sides of the main flow channel, and the containing cavity is in communication with the main flow channel; the island column is arranged in the containing cavity, and the island column is fixedly connected with the output end of a lifting drive mechanism, the lifting direction of the output end of the lifting drive mechanism is perpendicular to the plane where the main flow channel and the containing cavity are located, when the island column is in a raised state, a branch flow channel in communication with the main flow channel is formed in the containing cavity, and the main flow channel and the branch flow channel form a Tesla fluid one-way channel.

[0007] As an embodiment, the upper surface of the island column at the highest position is not lower than the smaller one of the height of the main flow channel and the height of the branch flow channel, and the upper surface of the island column at the lowest position is flush with the bottom surface of the main flow channel and the branch flow channel.

[0008] As an embodiment, the lifting driving mechanism is located at the bottom of the island column.

[0009] As an embodiment, the lifting driving mechanism comprises a screw rod, one end of the screw rod is connected with a rotating driving part, the other end of the screw rod is threadedly connected with the island column, and an axial limiting mechanism is connected with the screw rod.

[0010] As an embodiment, the end of the screw rod is connected with a rotating driving motor.

[0011] As an embodiment, the lifting driving mechanism comprises a hydraulic cylinder, and the end of the piston rod in the hydraulic cylinder is fixedly connected with the island column.

[0012] As an embodiment, a control system is further included, which is in communication connection with the lifting driving mechanism.

[0013] The application further provides a farmland gas collecting device, which comprises the one-way conducting structure, a detection gas tank and a gas suction pump, the gas inlet of the detection gas tank is in communication with the one-way conducting structure, the gas outlet of the detection gas tank is in communication with the gas suction pump, a pressure sensor is arranged in the detection gas tank, and the pressure sensor is in communication connection with the one-way conducting structure and the gas suction pump.

[0014] The application has the following technical effects relative to the prior art.

[0015] The one-way conducting structure in the application does not have a minimum opening pressure, and even if the gas extraction pressure is very small, the collection of the gas can be successfully realized, and the use is more convenient; and the lifting driving mechanism drives different numbers of island columns to be lifted, the check pressure of the one-way conducting structure can be adjusted, and then the gas collecting conditions of different pressure differences can be adapted, the situation that the check pressure is too small to cause the check pressure to be smaller than the pressure difference between the inside and outside of the gas container and the gas to flow back and leak is avoided, and thus the check effect is ensured and the adaptability to different gas collecting working conditions is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description only constitute some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0017] Figure 1 It is a schematic diagram of fluid flow when the one-way conducting structure of an embodiment of the application is conducted;

[0018] Figure 2A fluid flow schematic diagram when the check valve of the one-way conducting structure of one embodiment of the present application is in a closed state;

[0019] Figure 3 A schematic diagram of the cooperation structure of the island column and the lifting driving structure in one embodiment of the present application;

[0020] Figure 4 A schematic diagram of the structure of the farmland gas collecting device in one embodiment of the present application;

[0021] Explanation of reference signs:

[0022] 1, main flow channel; 2, branch flow channel; 3, island column; 4, screw rod; 5, rotating driving motor; 6, detection gas pool; 7, air pump; 8, pressure sensor; 9, one-way conducting structure. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0024] The purpose of the present application is to provide a one-way conducting structure and a farmland gas collecting device to solve the problems in the prior art. The one-way conducting structure does not have a minimum opening pressure and is more convenient to use. The lifting driving mechanism drives different numbers of island columns to rise, which can adjust the check pressure of the one-way conducting structure, thereby adapting to different pressure difference gas collecting conditions, so as to ensure the check effect and improve the adaptability to different gas collecting working conditions.

[0025] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0026] Embodiment 1:

[0027] As Figures 1-4As shown, the embodiment provides a one-way conduction structure 9, which includes a main flow channel 1, a containing cavity and an island column 3. The containing cavity is arranged on one side or both sides of the main flow channel 1, and the containing cavity is usually arranged on both sides of the main flow channel 1. The containing cavity is in communication with the main flow channel 1. The island column 3 is arranged in the containing cavity, and the island column 3 is fixedly connected with the output end of a lifting driving mechanism. The lifting direction of the output end of the lifting driving mechanism is perpendicular to the plane (i.e. the horizontal plane) where the main flow channel 1 and the containing cavity are located. The action of the output end of the lifting driving mechanism can drive the island column 3 to lift. When the island column 3 is in the lifted state, the island column 3 occupies part of the space of the containing cavity. The remaining space in the containing cavity forms a branch flow channel 2 in communication with the main flow channel 1. The main flow channel 1 and the branch flow channel 2 form a Tesla fluid one-way channel.

[0028] The Tesla fluid one-way channel has the characteristic of one-way conduction, such as Figure 1 As shown, when the gas flows from right to left, the one-way conduction structure 9 is in the conduction state, and the gas flows smoothly. As shown Figure 2 When the gas flows from left to right, the gas in the branch flow channel 2 will generate resistance to block the gas flow in the main flow channel 1. The more the number of the branch flow channels 2, i.e. the more the number of the island columns 3 in the lifted state, the greater the resistance to the gas flow in the main flow channel 1. In the initial stage of gas extraction, all the island columns 3 are in the lowered state. As the pressure in the gas container continuously rises, the island columns 3 are lifted in sequence from near to far (the near direction refers to the direction close to the gas container) to achieve the check effect.

[0029] Therefore, the one-way conduction structure 9 in the embodiment has no minimum opening pressure. Even if the gas extraction pressure is very small, the collection of the gas can be smoothly realized, and the use is more convenient. Moreover, by driving different numbers of island columns 3 to be lifted by the lifting driving mechanism, the check pressure of the one-way conduction structure 9 can be adjusted to adapt to different pressure difference conditions of the gas collection, so as to avoid the situation that the check pressure of the one-way conduction structure 9 is too small to cause the check pressure to be less than the pressure difference between the inside and outside of the gas container, resulting in the backflow and leakage of the gas, so as to not only ensure the check effect, but also improve the adaptability to different gas collection conditions.

[0030] In the embodiment, the upper surface height of the island column 3 lifted to the highest position is not less than the smaller one of the height of the main flow channel 1 and the height of the branch flow channel 2, so as to ensure that the island column 3 can divide the flow to make part of the flow converge into the main flow channel 1 through the branch flow channel 2. The upper surface of the island column 3 lowered to the lowest position is flush with the bottom surface of the main flow channel 1 and the branch flow channel 2.

[0031] In the embodiment, the lifting driving mechanism is located at the bottom of the island column 3, and the components of the lifting driving mechanism will not be located in the containing cavity during the lifting process of the island column 3. As an embodiment, as shown Figure 3As shown, the lifting drive mechanism includes a screw 4, one end of which is connected to a rotation drive unit, and the other end of which is threadedly connected to the island column 3. The screw 4 is connected to an axial limiter. The rotation drive unit drives the screw 4 to rotate, thereby driving the island column 3 to rise and fall. The rotation drive unit can be a rotation drive motor 5. Those skilled in the art will understand that in this embodiment, the island column 3 is located in a channel at the bottom of the accommodating chamber. Due to the limit of this channel, the island column 3 cannot rotate and can only be raised and lowered.

[0032] As another embodiment, the lifting drive mechanism includes a hydraulic cylinder, and the end of the piston rod in the hydraulic cylinder is fixedly connected to the island column 3. The hydraulic cylinder can also be replaced with an electric cylinder.

[0033] As an implementation mode, this embodiment further includes a control system, which is in communication with the lifting drive mechanism. The control system also controls the rotation drive motor 5 or the hydraulic cylinder to move, thereby realizing the lifting of different numbers of island columns 3.

[0034] Example 2:

[0035] like Figure 4 As shown, this embodiment also provides a farmland gas collection device, comprising the aforementioned one-way conducting structure 9, a detection gas pool 6, and an air pump 7. The air inlet of the detection gas pool 6 is connected to the one-way conducting structure 9, and the exhaust port of the detection gas pool 6 is connected to the air pump 7. A pressure sensor 8 is provided within the detection gas pool 6, and the pressure sensor 8 is in communication with the one-way conducting structure 9 and the air pump 7. When the pressure sensor 8 detects that the pressure within the detection gas pool 6 has reached a set value, the island columns 3 in the one-way conducting structure 9 rise. The greater the pressure within the detection gas pool 6, the more island columns 3 rise. When the pressure sensor 8 detects that the pressure within the detection gas pool 6 has reached the required collection pressure, the air pump 7 stops operating, and the one-way conducting structure 9 acts as a check valve to prevent the gas within the detection gas pool 6 from flowing back out. After the gas detection within the detection gas pool 6 is completed, all island columns 3 descend, and the gas within the detection gas pool 6 is naturally discharged.

[0036] Adaptive changes based on actual needs are all within the scope of protection of the present invention.

[0037] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A one-way conducting structure, characterized in that: include: Mainstream; an accommodating cavity, the accommodating cavity being arranged on one side or both sides of the main channel and being in communication with the main channel; and an island column, wherein the island column is arranged in the accommodating cavity and is fixedly connected to the output end of the lifting drive mechanism. The lifting direction of the output end of the lifting drive mechanism is perpendicular to the main channel and the plane where the accommodating cavity is located. When the island column is in a raised state, a branch channel connected to the main channel is formed in the accommodating cavity, and the main channel and the branch channel form a Tesla fluid one-way channel. By driving different numbers of the island columns to rise by the lifting drive mechanism, the backstop pressure of the one-way conductive structure can be adjusted; The upper surface height of the island column at the highest position is not lower than the smaller of the main channel height and the branch channel height, and the upper surface of the island column at the lowest position is flush with the bottom surfaces of the main channel and the branch channel; The lifting drive mechanism is located at the bottom of the island column; The lifting drive mechanism includes a screw rod, one end of which is connected to the rotation drive part, and the other end of which is threadedly connected to the island column. The screw rod is connected to an axial limiting mechanism.

2. The one-way conducting structure according to claim 1, characterized in that: The end of the screw rod is connected to a rotation drive motor.

3. The one-way conducting structure according to claim 1, characterized in that: The lifting drive mechanism includes a hydraulic cylinder, and the end of the piston rod in the hydraulic cylinder is fixedly connected to the island column.

4. The one-way conducting structure according to claim 1, characterized in that: It also includes a control system, which is communicatively connected with the lifting drive mechanism.

5. A farmland gas collection device, characterized in that: It comprises the one-way conducting structure, the detection gas pool and the air extraction pump as described in any one of claims 1 to 4, the air inlet of the detection gas pool is connected to the one-way conducting structure, the exhaust port of the detection gas pool is connected to the air extraction pump, a pressure sensor is provided in the detection gas pool, and the pressure sensor is communicatively connected to the one-way conducting structure and the air extraction pump.

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