One-way conducting structure and farmland gas collecting device

Abstract

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

Description

Technical Field

[0001] The present invention relates to the technical field of gas collection, and in particular to a one-way conducting structure and a farmland gas collection device. Background Art

[0002] At present, the conventional method of collecting carbon emission gases from farmland is to place an enrichment box above the plants, seal the plant area, and extract the gas in the box and take it back to the laboratory for analysis after a certain period of time. This method is mainly to prevent the airflow disturbance caused by low-altitude wind shear in the farmland from affecting the collection of gas. In the process of extracting gas, a gas container, a vacuum pump and a one-way valve are usually required, wherein the one-way valve is set at the air inlet of the gas container to prevent the backflow and leakage of high-pressure gas in the gas container. However, the one-way valve has a certain minimum opening pressure, that is, the one-way valve can still be turned on after the intake pressure reaches a certain value. When the extraction pressure is very small, it is difficult for the one-way valve to turn on. Moreover, the cut-off pressure of the one-way valve is fixed and cannot be adjusted with the internal and external pressure difference of the gas container. There is a possibility that the cut-off pressure may be broken.

[0003] Therefore, it is necessary to develop a unidirectional conductive structure to solve the above technical problems. Summary of the invention

[0004] The purpose of the present invention 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, by driving a lifting drive mechanism to lift different numbers of island columns, the check pressure of the one-way conduction structure can be adjusted to adapt to gas collection conditions with different pressure differences, thereby ensuring the check effect and improving the adaptability to different gas collection conditions.

[0005] To achieve the above object, the present invention provides the following solutions: A one-way conducting structure comprises a main channel, a containing cavity and an island column, wherein the containing cavity is arranged on one side or both sides of the main channel and is communicated with the main channel; the island column is arranged in the containing cavity and is fixedly connected to the output end of a lifting drive mechanism, wherein the lifting direction of the output end of the lifting drive mechanism is perpendicular to the plane where the main channel and the containing cavity are located, and when the island column is in a raised state, a branch channel communicated with the main channel is formed in the containing cavity, and the main channel and the branch channel form a Tesla fluid one-way channel.

[0006] As one embodiment, 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.

[0007] As one embodiment, the lifting drive mechanism is located at the bottom of the island column.

[0008] As one embodiment, the lifting drive mechanism includes a screw rod, one end of which is connected to the rotation drive unit, the other end of which is threadedly connected to the island column, and the screw rod is connected to an axial limiting mechanism.

[0009] As one embodiment, the end of the screw rod is connected to a rotation drive motor.

[0010] As one 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.

[0011] As an embodiment, it further includes a control system, and the control system is communicatively connected with the lifting drive mechanism.

[0012] The present invention also provides a farmland gas collection device, comprising the one-way conductive structure, a detection gas pool and an air pump as described above, wherein the air inlet of the detection gas pool is connected to the one-way conductive structure, the exhaust port of the detection gas pool is connected to the air pump, and a pressure sensor is arranged in the detection gas pool, and the pressure sensor is communicatively connected to the one-way conductive structure and the air pump.

[0013] Compared with the prior art, the present invention has the following technical effects: The one-way conduction structure in the present invention does not have a minimum opening pressure, and even if the gas extraction pressure is very small, the gas can be collected smoothly, which is more convenient to use; and the lifting drive mechanism drives different numbers of island columns to rise, so as to adjust the check pressure of the one-way conduction structure, thereby adapting to gas collection conditions with different pressure differences, and avoiding the situation where the check pressure of the one-way conduction structure is too small, resulting in the check pressure being less than the pressure difference between the inside and outside of the gas container, causing gas backflow and leakage, thereby ensuring the check effect and improving the adaptability to different gas collection conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 A schematic diagram of fluid flow when a unidirectional conductive structure according to an embodiment of the present invention is turned on; Figure 2 A schematic diagram of fluid flow when a one-way conducting structure is backstopped in one embodiment of the present invention; Figure 3 This is a schematic diagram of the coordination structure of the island column and the lifting drive structure in one embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a farmland gas collection device in one embodiment of the present invention; Description of reference numerals: 1. Main channel; 2. Branch channel; 3. Island column; 4. Screw rod; 5. Rotation drive motor; 6. Detection gas pool; 7. Air pump; 8. Pressure sensor; 9. One-way conduction structure. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] The purpose of the present invention 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, by driving a lifting drive mechanism to lift different numbers of island columns, the check pressure of the one-way conduction structure can be adjusted to adapt to gas collection conditions with different pressure differences, thereby ensuring the check effect and improving the adaptability to different gas collection conditions.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Embodiment 1: like Figure 1~Figure 4 As shown, this embodiment provides a one-way conducting structure 9, including a main channel 1, a receiving chamber and an island column 3. The receiving chamber is arranged on one side or both sides of the main channel 1. Usually, the receiving chamber is arranged on both sides of the main channel 1, and the receiving chamber is connected with the main channel 1; the island column 3 is arranged in the receiving chamber, and the island column 3 is fixedly connected with the output end of the lifting drive mechanism. The lifting direction of the output end of the lifting drive mechanism is perpendicular to the plane where the main channel 1 and the receiving chamber are located (i.e., the horizontal plane), and the output end of the lifting drive mechanism can drive the island column 3 to move up and down. When the island column 3 is in the raised state, the island column 3 occupies part of the space of the receiving chamber, and the remaining space in the receiving chamber forms a branch channel 2 connected with the main channel 1, and the main channel 1 and the branch channel 2 form a Tesla fluid one-way channel.

[0020] Tesla fluid one-way channel has the characteristic of one-way conduction, such as Figure 1As shown, when the gas flows from right to left, the unidirectional conductive structure 9 is in a conductive state, and the gas flows smoothly; Figure 2 As shown, when the gas flows from left to right, the gas in the branch channel 2 will generate resistance to block the flow of gas in the main channel 1, and the more branch channels 2 there are, that is, the more island columns 3 are in the raised state, the greater the resistance to the flow of gas in the main channel 1. In the initial stage of gas extraction, all island columns 3 are in a lowered state. As the pressure in the gas container continues to increase, the island columns 3 rise from near to far (the near direction refers to the direction close to the gas container) in sequence to achieve a check effect.

[0021] Therefore, the one-way conductive structure 9 in this embodiment does not have a minimum opening pressure, and even if the gas extraction pressure is very small, the gas can be collected smoothly, which is more convenient to use; and by driving the lifting drive mechanism to lift different numbers of island columns 3, the check pressure of the one-way conductive structure 9 can be adjusted to adapt to the gas collection conditions with different pressure differences, thereby avoiding the situation where the check pressure of the one-way conductive structure 9 is too small, resulting in the check pressure being less than the pressure difference between the inside and outside of the gas container, causing gas backflow and leakage, thereby ensuring the check effect and improving the adaptability to different gas collection conditions.

[0022] In this embodiment, the upper surface height of the island column 3 raised to the highest position is not lower than the smaller of the main channel 1 height and the branch channel 2 height, ensuring that the island column 3 can divert the fluid and make part of the fluid flow into the main channel 1 through the branch channel 2; the upper surface of the island column 3 lowered to the lowest position is flush with the bottom surfaces of the main channel 1 and the branch channel 2.

[0023] In this embodiment, the lifting drive mechanism is located at the bottom of the island column 3, and during the lifting and lowering process of the island column 3, the parts of the lifting drive mechanism will not be located in the accommodating cavity. Figure 3 As shown, the lifting drive mechanism includes a screw rod 4, one end of which is connected to the rotation drive unit, and the other end of the screw rod 4 is threadedly connected to the island column 3. The screw rod 4 is connected to an axial limit mechanism, and the screw rod 4 is driven to rotate by the rotation drive unit, thereby driving the island column 3 to be lifted. Among them, the rotation drive unit can be a rotation drive motor 5. Those skilled in the art should understand that the island column 3 in this embodiment is located in the channel at the bottom of the accommodating cavity, and the island column 3 will not rotate under the limiting effect of this channel, and can only be lifted.

[0024] 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 by an electric cylinder.

[0025] As an implementation mode, this embodiment also includes a control system, which is communicated 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.

[0026] Embodiment 2: like Figure 4 As shown, this embodiment also provides a farmland gas collection device, including the one-way conduction structure 9, the detection gas pool 6 and the air pump 7 as mentioned above, the air inlet of the detection gas pool 6 is connected to the one-way conduction structure 9, the exhaust port of the detection gas pool 6 is connected to the air pump 7, and a pressure sensor 8 is arranged in the detection gas pool 6, and the pressure sensor 8 is connected to the one-way conduction structure 9 and the air pump 7. When the pressure sensor 8 detects that the pressure in the detection gas pool 6 reaches the set value, the island column 3 in the one-way conduction structure 9 rises, and the greater the pressure value in the detection gas pool 6, the more the island column 3 rises. When the pressure sensor 8 detects that the pressure in the detection gas pool 6 reaches the required collection pressure, the air pump 7 stops working, and the one-way conduction structure 9 realizes a check function to prevent the gas in the detection gas pool 6 from flowing back and leaking. After the gas detection in the detection gas pool 6 is completed, all the island columns 3 are lowered, and the gas in the detection gas pool 6 is naturally discharged.

[0027] Adaptive changes made according to actual needs are all within the protection scope of the present invention.

[0028] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A one-way conductive structure, characterized in that: include: Main stream; An accommodating cavity, wherein the accommodating cavity is arranged on one side or both sides of the main channel, and the accommodating cavity is communicated with the main channel; And an island column, wherein the island column is arranged in the accommodating cavity, the island column 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.

2. The one-way conductive structure according to claim 1, characterized in that: 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.

3. The one-way conductive structure according to claim 2, characterized in that: The lifting drive mechanism is located at the bottom of the island column.

4. The one-way conductive structure according to claim 3, characterized in that: The lifting drive mechanism includes a screw rod, one end of which is connected to the rotation drive part, the other end of which is threadedly connected to the island column, and the screw rod is connected to an axial limiting mechanism.

5. The one-way conductive structure according to claim 4, characterized in that: The end of the screw rod is connected with a rotation driving motor.

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

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

8. 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 7, 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 arranged in the detection gas pool, and the pressure sensor is communicatively connected with the one-way conducting structure and the air extraction pump.

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