Carbon dioxide concentration detection mixing channel

Abstract

The utility model discloses a kind of carbon dioxide concentration detection mixed passageway, including fan, the air outlet of fan is connected with bottom pipeline;Venturi pipeline is connected with the end of bottom pipeline away from fan;Branch pipeline is communicated with venturi pipeline, and branch pipeline opening is respectively located at different positions in greenhouse interior. By fan to the inside of venturi pipeline blowing, can increase the air flow rate of narrow section, and then make narrow section form negative pressure;At this time, the drainage tube distributed at different positions in greenhouse interior attracts air to flow to narrow section;Due to the fast air flow velocity of narrow section, the air attracted by drainage tube can be mixed;To ensure that carbon dioxide concentration detection value in greenhouse is more accurate.

Description

Technical Field

[0001] This utility model relates to the field of carbon dioxide concentration detection technology, and in particular to a carbon dioxide concentration detection mixed channel. Background Technology

[0002] In greenhouse crop cultivation, carbon dioxide concentration, as a core substrate for photosynthesis, directly determines the physiological activity and yield formation of crops in its dynamic balance. When the concentration is below the crop's light compensation point, the net photosynthetic rate turns negative, leading to growth stagnation. When the concentration rises to a suitable range, it can significantly enhance the activity of carbon assimilation enzymes and promote biomass accumulation. However, exceeding the critical threshold will inhibit stomatal function and mineral element transport, inducing nutrient deficiencies and metabolic imbalances. Therefore, it is necessary to accurately control the carbon dioxide concentration in a greenhouse environment to better promote crop growth.

[0003] In the field of greenhouse environmental monitoring, accurate measurement of carbon dioxide concentration is crucial for optimizing crop photosynthesis. Current methods for detecting carbon dioxide concentration involve installing NDIR infrared sensors at fixed locations to measure the carbon dioxide concentration inside the greenhouse. However, since carbon dioxide gas is denser than air, vertical concentration stratification easily forms when the greenhouse is sealed, resulting in single-point measurement results failing to reflect the average value inside the greenhouse environment. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is that existing carbon dioxide detection only detects the air in a local area of ​​the greenhouse, without mixing and detecting the air from multiple locations in the greenhouse, which leads to inaccurate carbon dioxide concentration detection values.

[0005] The above-mentioned technical problems are solved by the following technical solution: This utility model proposes a carbon dioxide concentration detection mixing channel, which includes a fan, and the air outlet of the fan is connected to a bottom pipe;

[0006] The Venturi pipe is connected to the end of the bottom pipe furthest from the fan;

[0007] Branch pipes are connected to the Venturi pipes, and the openings of the branch pipes are located at different positions inside the greenhouse.

[0008] In a preferred embodiment of the carbon dioxide concentration detection mixing channel of this utility model: a connecting pipe is provided between the bottom pipe and the Venturi pipe;

[0009] The venturi includes open sections at both ends and a narrow section in the middle.

[0010] The open section is connected to the connecting pipe.

[0011] In a preferred embodiment of the carbon dioxide concentration detection mixing channel of this utility model: a storage tank is connected to the end of the Venturi tube away from the bottom tube;

[0012] An exhaust pipe is connected to the end of the storage tank.

[0013] In a preferred embodiment of the carbon dioxide concentration detection mixing channel of this utility model: the branch pipeline includes a conduit and a drainage tube;

[0014] The drainage tubes are in multiple sets, and all sets of drainage tubes are connected to the catheter.

[0015] In a preferred embodiment of the carbon dioxide concentration detection mixing channel of this utility model: the conduit passes through the narrow section and is connected to the Venturi tube.

[0016] In a preferred embodiment of the carbon dioxide concentration detection mixing channel of this utility model: an on / off valve is installed on the outer wall of the drainage tube.

[0017] In a preferred embodiment of the carbon dioxide concentration detection mixing channel of this utility model: the bottom pipe is laid near the ground in the greenhouse, and the drainage pipes are laid sequentially at different heights in the greenhouse.

[0018] The beneficial effects of this invention are as follows: by blowing air into the venturi pipe by a fan, the air velocity in the narrow section can be increased, thereby creating a negative pressure in the narrow section; at this time, the drainage pipes distributed in different positions inside the greenhouse attract air to flow into the narrow section; because the air velocity in the narrow section is fast, the air attracted by the drainage pipes can be mixed; thus ensuring that the carbon dioxide concentration detection value in the greenhouse is more accurate. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments of this utility model will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this utility model, and are not intended to limit the utility model.

[0020] Figure 1 A three-dimensional structural schematic diagram of the carbon dioxide concentration detection mixing channel is shown;

[0021] Figure 2 A front view of the carbon dioxide concentration detection mixing channel is shown;

[0022] Figure 3 A top view of the carbon dioxide concentration detection mixing channel is shown;

[0023] Figure 4 A schematic diagram of airflow is shown. Detailed Implementation

[0024] To enable those skilled in the art to better understand this utility model, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0025] The terminology used in this invention refers to those general terms currently widely used in the art in consideration of the functionality of this invention; however, these terms may vary according to the intent, precedent, or new technology of those skilled in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of this invention. Therefore, the terminology used in this specification should not be construed as simple names, but rather based on the meaning of the terms and the overall description of this invention.

[0026] Reference Figures 1-4 This embodiment provides a carbon dioxide concentration detection mixing channel, including a fan 1, the air outlet of the fan 1 is connected to a bottom pipe 2; the fan 1 is installed near the greenhouse floor and fixed in a corresponding position inside the greenhouse by a mounting bracket, the bottom pipe 2 is connected to the air outlet of the fan 1, when the fan 1 is started, the air will flow along the internal pipe of the bottom pipe 2 under the action of the fan 1.

[0027] Furthermore, the Venturi pipe 3 is connected to the end of the bottom pipe 2 away from the fan 1; the Venturi pipe 3 and the bottom pipe 2 are connected; the Venturi pipe 3 is a flared structure with both ends expanding, and the diameter of the middle part is relatively smaller than that of the two ends; when air flows through the middle part of the Venturi pipe 3, the air velocity increases due to the decrease in pipe diameter, which reduces the pressure in the middle part of the Venturi pipe 3.

[0028] It should be noted that the detection unit 4 is installed at the end of the venturi pipe 3 away from the bottom pipe 2. The detection unit 4 uses an existing carbon dioxide concentration sensor, which can accurately detect the carbon dioxide concentration in the air.

[0029] Furthermore, branch pipe 5 is connected to Venturi pipe 3, and the openings of branch pipe 5 are located at different positions inside the greenhouse.

[0030] It should be noted that the opening ends of the branch pipes 5 are distributed in different locations inside the greenhouse; and the branch pipes 5 are connected to the middle part of the venturi pipes 3; when the pressure in the middle part of the venturi pipes 3 is lower than atmospheric pressure, the air inside the branch pipes 5 will flow towards the middle part of the venturi pipes 3; thus, the air in different locations inside the greenhouse can be gathered together.

[0031] Specifically, the airflow speed in the middle section of Venturi pipe 3 is relatively fast, which can quickly mix the air in different locations inside the greenhouse, thereby shortening the gas mixing time and better ensuring the detection of carbon dioxide concentration.

[0032] When staff need to know the carbon dioxide concentration inside the greenhouse, they can start the fan 1 to send air into the pipes inside the bottom pipe 2. The air then flows through the venturi pipe 3 and enters the middle section of the venturi pipe 3. Because the diameter of the middle section of the venturi pipe 3 is narrow, the air flow speed increases and the pressure decreases when it passes through this section. The air pressure at the opening of the drain pipe 52 is greater than the air pressure at the middle section of the venturi pipe 3, so that the air enters the venturi pipe 3 through the branch pipe 5. The air in different locations inside the greenhouse can be quickly mixed, and the mixed air can be detected by the detection unit 4 to obtain a relatively accurate value of the carbon dioxide concentration inside the greenhouse.

[0033] Reference Figures 1-4 As an optional embodiment, a connecting pipe 6 is provided between the bottom pipe 2 and the venturi pipe 3; the venturi pipe 3 includes open sections 31 at both ends and a narrow section 32 in the middle; the open sections 31 are connected to the connecting pipe 6.

[0034] It should be noted that the connecting pipe 6 has a flared structure. The end of the connecting pipe 6 that connects to the bottom pipe 2 has a smaller diameter, while the end that connects to the venturi pipe 3 has a slightly larger diameter. This ensures that the air flows more smoothly into the connecting pipe 6 after passing through the bottom pipe 2. Then, the end of the connecting pipe 6 with a larger opening connects to the venturi pipe 3, so that the air flow velocity inside the venturi pipe 3 is slow. Then, when the air passes through the narrow section 32, the high-velocity air flow can reduce the pressure at the narrow section 32, thereby ensuring that the greenhouse air corresponding to the branch pipe 5 can enter the narrow section 32.

[0035] Specifically, the connecting pipe 6 and the bottom pipe 2 are connected and fixed by bolts and nuts. A sealing gasket is provided on the end face of the connecting pipe 6 that contacts the bottom pipe 2, thereby ensuring the tightness of the connection between the bottom pipe 2 and the connecting pipe 6 and effectively preventing air leakage from the connection point between the bottom pipe 2 and the connecting pipe 6.

[0036] Furthermore, the connecting pipe 6 and the open section 31 are connected and fixed by bolts and nuts. A sealing gasket is provided on the end face of the connecting pipe 6 that contacts the open section 31 to prevent air from leaking from the connection between the connecting pipe 6 and the open section 31.

[0037] Furthermore, the end of the Venturi pipe 3 furthest from the bottom pipe 2 is connected to a storage tank 7; the detection unit 4 is connected to the storage tank 7; and an exhaust pipe is connected to the end of the storage tank 7.

[0038] It should be noted that, in order to further ensure the accuracy of carbon dioxide concentration detection in greenhouse air, a storage tank 7 is connected to the end of the Venturi pipe 3 away from the connecting pipe 6. The air that flows into the Venturi pipe 3 through the branch pipe 5 will gather and mix inside the storage tank 7. This allows the air in different locations inside the greenhouse to mix quickly, further improving the accuracy of monitoring carbon dioxide concentration in the greenhouse environment.

[0039] Specifically, the digital display of the detection unit 4 is located on the outer wall of the storage tank 7, and the detection terminals of the detection unit 4 are located inside the storage tank 7. The carbon dioxide concentration inside the storage tank 7 is analyzed through the detection terminals.

[0040] Furthermore, an exhaust pipe is provided at the end of the storage tank 7 away from the venturi pipe 3, and a valve is provided on the outside of the pipe, which is in the normally open state; thus, the air inside the storage tank 7 will flow back to the greenhouse along the exhaust pipe to avoid the accumulation of pressure inside the storage tank 7; the connection method between the storage tank 7 and the venturi pipe 3 can be referred to the connection method between the venturi pipe 3 and the connecting pipe 6, which will not be described in detail here.

[0041] refer to Figures 1-3 In one embodiment provided in this application, the branch pipeline 5 includes a conduit 51 and a drainage tube 52; the number of drainage tubes 52 is multiple sets, and all multiple sets of drainage tubes 52 are connected to the conduit 51.

[0042] It should be noted that the conduit 51 and the drainage pipe 52 are connected by a pipe joint. Multiple sets of drainage pipes 52 are connected to the conduit 51, and the opening end of the conduit 51 can be located at any position inside the greenhouse. This ensures that the air inside the greenhouse that is near the opening of the drainage pipe 52 can enter the Venturi pipe 3 through the drainage pipe 52.

[0043] Furthermore, catheter 51 penetrates the narrow segment 32 and connects to the Venturi tube 3.

[0044] It should be noted that the catheter 51 is connected to the stenotic segment 32 to ensure that when a negative pressure is formed at the stenotic segment 32, air near the opening at the end of the drainage tube 52 can be drawn into the stenotic segment 32.

[0045] Specifically, because the air flow speed is faster at the narrow section 32, when the air inside the drainage pipe 52 enters the narrow section 32, it will quickly mix with the air brought by the fan 1, and then the air will be mixed inside the storage tank 7, thereby achieving the accuracy of carbon dioxide concentration detection.

[0046] Furthermore, the bottom pipe 2 is installed near the ground in the greenhouse, and the drainage pipe 52 is installed at different heights in the greenhouse.

[0047] It should be noted that during the installation of this device, the fan 1 can be installed at the bottom of the greenhouse, and then the drainage pipes 52 can be laid in layers inside the greenhouse, ensuring that the openings at the ends of the drainage pipes 52 correspond to different locations inside the greenhouse. In this way, the detection unit 4 is installed at the bottom, which can simultaneously meet the requirements for measuring the carbon dioxide concentration at multiple locations inside the greenhouse, making it easier for staff to operate.

[0048] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways, as long as they do not depart from the scope of this utility model.

[0049] Importantly, the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A carbon dioxide concentration detection hybrid channel, characterized in that: include, A fan (1), the air outlet of which is connected to a bottom pipe (2); Venturi pipe (3) is connected to the end of the bottom pipe (2) away from the fan (1); Branch pipes (5) are connected to the Venturi pipes (3), and the openings of the branch pipes (5) are located at different positions inside the greenhouse. A connecting pipe (6) is provided between the bottom pipe (2) and the Venturi pipe (3); The Venturi tube (3) includes open sections (31) at both ends and a narrow section (32) in the middle. The opening section (31) is connected to the connecting pipe (6); The branch pipeline (5) includes a conduit (51) and a drainage tube (52); The number of drainage tubes (52) is multiple sets, and all sets of drainage tubes (52) are connected to the conduit (51); The conduit (51) passes through the narrow section (32) and is connected to the Venturi tube (3); An on / off valve (8) is installed on the outer wall of the drainage tube (52).

2. The carbon dioxide concentration detection mixing channel according to claim 1, characterized in that: The venturi pipe (3) is connected to a storage tank (7) at the end away from the bottom pipe (2); The storage tank (7) is connected to an exhaust pipe at one end.

3. The carbon dioxide concentration detection mixing channel according to claim 2, characterized in that: The bottom pipe (2) is laid near the ground in the greenhouse, and the drainage pipe (52) is laid at different heights in the greenhouse.

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