A carbon dioxide automatic replenishing device for greenhouse

Abstract

The utility model designs the technical field of greenhouse planting equipment, and specifically discloses an automatic carbon dioxide replenishing device for a greenhouse. It adopts a suspended manner to carry out multi-point top gas supply, so that the gas acts directly on the leaf surface, shortens the carbon dioxide escape path, and improves the carbon dioxide utilization rate. At the same time, a gas sensor is integrated in the gas release device to detect the carbon dioxide concentration of the gas above the gas release device, and monitors the gas replenishment result near the action point in real time to avoid waste of excess or insufficient gas that affects plant development. At the same time, combined with a height adjustment device, the gas release device can cover the entire crop at all times without contacting the top of the crop and interfering with the crop growth.

Description

Technical Field

[0001] This utility model relates to the field of greenhouse planting equipment technology, specifically to an automatic carbon dioxide replenishment device for greenhouses. Background Technology

[0002] When growing crops in greenhouses, the growing temperature can be maintained for a long time. However, after the crops photosynthesize, a large amount of carbon dioxide in the air is consumed. Since greenhouses are enclosed spaces, they cannot be ventilated for a long time. This will cause a shortage of carbon dioxide, which will affect the photosynthesis of plants and thus affect the growth and development rate of crops, thereby reducing the yield and quality of crops.

[0003] To increase the CO2 concentration inside greenhouses, the following methods are currently used both domestically and internationally:

[0004] (1) Ventilation method: This method uses ventilation to increase the concentration of CO2. It is simple and cost-free. However, since the CO2 content in the atmosphere is not high, generally 0.03%, it cannot completely solve the problem of insufficient CO2 (the suitable CO2 concentration for photosynthesis is about 0.06-0.1%). In cold winters, ventilation will lower the temperature inside the greenhouse, so this method is not ideal.

[0005] (2) Apply more organic fertilizer to release CO2. This method has a wide range of raw material sources and low prices, and is currently a commonly used method. However, the CO2 production time is long and the concentration still does not meet the requirements, so the increase in yield is limited.

[0006] (3) CO2 is produced by chemical methods, commonly using ammonium bicarbonate and sulfuric acid. This method requires a relatively complex set of equipment, and is therefore quite difficult and costly.

[0007] With the rapid development of modern technology, some special carbon dioxide storage tanks have appeared on the market, releasing the gas inside the tanks into greenhouses to replenish carbon dioxide. However, during the replenishment process, because the concentration of carbon dioxide itself is greater than that of air, the replenished carbon dioxide gas generally settles directly at the bottom and flows along the ground surface, failing to directly affect the leaves of plants that need to perform photosynthesis. Moreover, it is impossible to monitor and adjust the gas concentration inside the greenhouse in real time. Current methods for collecting carbon dioxide concentration inside greenhouses generally use sensors at specific locations. Because the gas dissipates slowly after replenishment, the gas concentration inside the greenhouse is not uniform. Adjusting the gas replenishment based on the concentration detection at specific points can result in the concentration inside the greenhouse being too high or too low. Utility Model Content

[0008] The technical problem this invention aims to solve is to overcome existing defects and provide an automatic carbon dioxide replenishment device for greenhouses. This device uses a suspended design for multi-point top-mounted gas supply, allowing the gas to directly act on the leaves, shortening the carbon dioxide escape path and improving carbon dioxide utilization. Simultaneously, a gas sensor is integrated into the gas release device to detect the carbon dioxide concentration above the device, monitoring the replenishment results near the point of application in real time. This avoids excessive gas waste or insufficient gas affecting plant development. Furthermore, combined with a height adjustment device, the device's effective range always covers the entire crop without contacting the top of the crop, thus avoiding interference with crop growth. This effectively solves the problems in the prior art.

[0009] To achieve the above objectives, this utility model provides the following technical solution: an automatic carbon dioxide replenishment device for greenhouses, comprising,

[0010] A gas replenishment device includes a light intensity sensor for detecting ambient light, a gas concentration sensor for detecting gas concentration, and a gas release device that can adjust the gas release rate based on the output signals of the light intensity sensor and the gas concentration sensor.

[0011] The suspension device includes a traction rope for suspending gas replenishment and a height adjustment device that can change the actual working length of the traction rope.

[0012] As a preferred embodiment of this utility model, the gas release device is a rotating structure that releases gas from its outer circumference. The axis of the gas release device is vertically arranged and vertically penetrates the detection chamber. The gas concentration sensor is built into the detection chamber, and a fan is installed in the detection chamber to promote airflow. The fan generates airflow from top to bottom, compressing the gas above the gas release device through the detection chamber. When the gas passes through the gas concentration sensor, the carbon dioxide concentration can be detected. When the gas concentration below the gas release device reaches the standard, the carbon dioxide concentration in the gas above it will simultaneously reach the corresponding value. At this time, the gas supply can be stopped, or the gas supply speed can be adjusted according to the rate of increase of carbon dioxide in the gas above.

[0013] As a preferred technical solution of this utility model, the fan is an axial flow fan located at the bottom of the detection chamber and blowing air downwards, and both ends of the detection chamber are covered with metal mesh;

[0014] By adding metal mesh to both ends of the detection chamber and combining it with the continuous airflow of the fan, the probability of condensation at the gas concentration sensor probe is further reduced, thereby improving the sensitivity of the detection.

[0015] As a preferred embodiment of the present invention, the gas release device further includes an annular gas chamber, an electric valve connected in series in the gas supply pipe of the gas chamber, and a diffusion net for gas diffusion is provided on the outer circumferential surface of the gas chamber.

[0016] By increasing the diffusion network, the area of ​​carbon dioxide overflow is expanded, the flow rate of carbon dioxide during overflow is reduced, and its impact distance is decreased, so that it can cover the crop area near the gas release device and improve the utilization rate of carbon dioxide.

[0017] As a preferred technical solution of this utility model, the upper end of the gas releasing device is provided with an upper cover to prevent gas from floating;

[0018] This avoids the problem of overestimating test results caused by gas overflowing from the diffuser directly entering the detection chamber.

[0019] As a preferred technical solution of this utility model, the gas replenishment device is provided with a supplementary light, and the upper cover can block the light path between the supplementary light and the light intensity sensor.

[0020] By adding supplemental lighting, another essential element of photosynthesis—light—can be addressed, extending the duration of illumination, enhancing the effectiveness of photosynthesis, and promoting crop development and growth.

[0021] As a preferred technical solution of this utility model, the height adjustment device includes an outer roller for winding the traction rope and a spindle for driving the outer roller to rotate, and a detachable transmission mechanism is provided between the outer roller and the spindle.

[0022] When the outer roller is wrapped with the traction rope, the load is too large, and the transmission mechanism between the spindle and the outer roller disengages.

[0023] The design of the transmission mechanism avoids over-winding of the outer roller. After the traction rope is fully retracted, the mandrel can spin freely without damaging the outer roller and the gas replenishment device. At the same time, on site, the operator can manually pull down the gas replenishment device to the appropriate position without damaging the mandrel.

[0024] As a preferred technical solution of this utility model, the transmission mechanism includes a helical spline structure between the spindle and the outer roller, and an elastic element that restricts the axial relative position between the two.

[0025] The inclined direction of the helical teeth in the helical spline structure is consistent with the rotation direction of the outer roller when it releases the traction line;

[0026] Through the design of the transmission mechanism, when the tension is overloaded, the spindle and the outer roller can move axially relative to each other, the helical splines can disengage, and then the spindle can freely release the traction rope without being restricted by the spindle. When the tension is restored, the spindle and the outer roller can be reset under the action of the elastic element. At the same time, under the action of the shoulder at the other end of the spindle, the relative axial movement and relative rotation of the two are restricted, and the change in the length of the traction rope is also limited.

[0027] As a preferred technical solution of this utility model, the mandrel is rotatably provided with a fixed seat for top hanging, and the end of the mandrel is provided with a motor or a connector for connecting to an external drive source.

[0028] When the same crop is planted in a greenhouse, their growth rates are similar. Multiple sets of suspension devices can be connected in series, that is, multiple sets of suspension devices can be connected by connecting rods to achieve synchronous winding of the traction rope, that is, synchronous adjustment of the height of the gas replenishment device.

[0029] Compared with the prior art, the present invention has at least the following beneficial effects:

[0030] 1. The automatic carbon dioxide replenishment device used in this greenhouse adopts a suspension device, which suspends the gas release device directly to the top of the crop, and supplies gas from the top in a multi-point distribution, reducing the gas escape path, increasing the gas concentration around the crop, and improving the photosynthetic efficiency.

[0031] 2. The gas release device is suspended and arranged. Utilizing the principle that the concentration of carbon dioxide is greater than that of air, the released carbon dioxide gas sinks directly to the crop leaves and acts directly on them for photosynthesis, thereby improving the carbon dioxide utilization rate and reducing the gas supply and saving costs.

[0032] 3. The gas supply device integrates a light intensity sensor, which can automatically adjust the gas supply according to changes in ambient light to ensure the crop's photosynthesis during the day and respiration at night. It also integrates a gas concentration sensor to detect carbon dioxide concentration in real time and adjust the gas supply speed in real time according to the concentration change curve to ensure that the carbon dioxide concentration is always at the optimal concentration for photosynthesis.

[0033] 4. Moreover, the suspension device integrates a height adjustment mechanism, which facilitates the adjustment of the gas supply device to the top of the crop and ensures that it does not interfere with crop growth. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of this utility model;

[0035] Figure 2 This is the front view of the present utility model;

[0036] Figure 3 This is a sectional view of the suspension device of this utility model;

[0037] Figure 4 This is a schematic diagram of the mandrel structure of this utility model;

[0038] Figure 5 This is a schematic diagram of the gas replenishment device of this utility model;

[0039] Figure 6 This is a schematic diagram of another embodiment of the structure of this utility model.

[0040] In the diagram: 1. Gas replenishment device; 101. Upper cover; 102. Diffusion mesh; 103. Inner shell; 104. Supplemental light; 105. Fan; 106. Gas concentration sensor; 107. Gas chamber; 108. Equipment chamber; 109. Detection chamber; 110. Metal mesh; 111. Light intensity sensor; 2. Suspension device; 201. Outer roller; 202. Fixing base; 203. Mandrel; 2031. Shoulder; 2032. Connector; 2033. Helical spline structure; 204. Elastic element; 205. Motor. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] Please see Figures 1-6 This utility model provides a technical solution: an automatic carbon dioxide replenishment device for greenhouses, which uses a suspended method to supply gas at multiple points on the top, allowing the gas to act directly on the leaves, shortening the carbon dioxide escape path and improving carbon dioxide utilization. Simultaneously, a gas sensor is integrated into the gas release device to detect the carbon dioxide concentration of the gas above the device, monitoring the replenishment results near the point of application in real time to avoid waste from excessive gas or negative impacts on plant development from insufficient gas. Furthermore, combined with a height adjustment device, the effective range of the gas release device can always cover the entire crop without contacting the top of the crop, thus avoiding interference with crop growth. Specifically:

[0043] include,

[0044] The gas replenishment device 1 includes a light intensity sensor 111 for detecting ambient light, a gas concentration sensor 106 for detecting gas concentration, and a gas release device that can adjust the gas release rate according to the output signals of the light intensity sensor 111 and the gas concentration sensor 106.

[0045] See Figure 5The gas release device is a rotating structure that releases gas from its outer circumference. The axis of the gas release device is vertically arranged and vertically passes through the detection chamber 109. The gas concentration sensor 106 is built into the detection chamber 109. A fan 105 is installed in the detection chamber 109 to promote airflow. The fan 105 generates airflow from top to bottom, which compresses the gas above the gas release device through the detection chamber 109. When the gas concentration sensor 106 passes through the gas, the carbon dioxide concentration can be detected. When the gas concentration below the gas release device reaches the standard, the carbon dioxide concentration in the gas above it will reach the corresponding value simultaneously. At this time, the gas supply can be stopped, or the gas supply speed can be adjusted according to the change in the rate of increase of carbon dioxide in the gas above.

[0046] The fan 105 is an axial flow fan located at the bottom of the detection chamber 109 and blowing air downwards. Both ends of the detection chamber 109 are covered with metal mesh 110.

[0047] By adding metal mesh 110 to both ends of the detection chamber 109 and combining it with the continuous airflow of the fan 105, the probability of condensation at the probe position of the gas concentration sensor 106 is further reduced, thereby improving the sensitivity of the detection.

[0048] The gas release device also includes an annular gas chamber 107, an electric valve connected in series in the gas supply pipe of the gas chamber 107, and a diffusion net 102 for gas diffusion is provided on the outer circumferential surface of the gas chamber 107.

[0049] By increasing the diffusion net 102, the area of ​​carbon dioxide overflow is expanded, the flow rate of carbon dioxide when it overflows is reduced, and its impact distance is decreased, so that it can cover the crop area near the gas release device and improve the utilization rate of carbon dioxide.

[0050] The upper end of the gas release device is provided with an upper cover 101 to prevent gas from rising;

[0051] This avoids the problem of overestimating the detection results caused by gas overflowing from the diffuser 102 directly entering the detection chamber 109.

[0052] The gas replenishment device 1 is equipped with a supplementary light 104, and the upper cover 101 can block the light path between the supplementary light 104 and the light intensity sensor 111.

[0053] By adding supplemental lighting (104 lamps), another essential element of photosynthesis, namely light, is addressed, extending the duration of illumination, enhancing the effectiveness of photosynthesis, and promoting crop development and growth.

[0054] The gas release device preferably has a cylindrical inner shell 103 and a frustum-shaped diffuser 102, with the larger diameter of the frustum facing upwards and the outer circumferential surface serving as the diffuser surface. The inner cavity and the inner shell 103 together form a gas chamber 107. The gas chamber 107 is equipped with an electric valve that connects to the gas supply pipeline. At the same time, an independent equipment chamber 108 is set inside the inner shell 103. The equipment integrates a control unit and a gas concentration sensor. The controller is preferably an ESP8266 controller, which has Internet of Things (IoT) capabilities and can transmit data to a host computer via a wireless network to achieve network control. The gas concentration sensor is preferably an NDIR (Non-Dispersive Infrared) sensor, which has high accuracy and controllable cost.

[0055] See Figures 2-4 The suspension device 2 includes a traction rope for the suspension gas replenishment device 1 and a height adjustment device that can change the actual working length of the traction rope.

[0056] The height adjustment device includes an outer roller 201 for winding the traction rope and a spindle 203 for driving the outer roller 201 to rotate. A detachable transmission mechanism is provided between the outer roller 201 and the spindle 203.

[0057] When the outer roller 201 is wrapped with the traction rope, the load is too large and the transmission mechanism between the spindle 203 and the outer roller 201 disengages.

[0058] The design of the transmission mechanism can prevent the outer roller 201 from over-winding. That is, after the traction rope is fully retracted, the spindle 203 can rotate freely without damaging the outer roller 201 and the gas replenishment device 1. At the same time, on site, the operator can manually pull down the gas replenishment device 1 to the appropriate position without damaging the spindle 203.

[0059] The transmission mechanism includes a helical spline structure 2033 between the spindle 203 and the outer roller 201, and an elastic element 204 that restricts the axial relative position between the two.

[0060] The inclined direction of the helical teeth in the helical spline structure 2033 is consistent with the rotation direction of the outer roller 201 when it releases the traction line;

[0061] Through the design of the transmission mechanism, when the tension is overloaded, the spindle 203 and the outer roller 201 can move axially relative to each other, and the helical splines can disengage from each other. Then the spindle 203 can freely release the traction rope without being restricted by the spindle 203. When the tension is restored, the spindle 203 and the outer roller 201 can be reset under the action of the elastic element 204. At the same time, under the action of the shoulder 2031 at the other end of the spindle 203, the relative axial movement and relative rotation of the two are restricted, and the change of the length of the traction rope is also limited.

[0062] The spindle 203 is externally rotatably provided with a fixed base 202 for top hanging, and the end of the spindle 203 is provided with a motor 205 or a connector 2032 for connecting to an external drive source;

[0063] When the same crop is planted in the greenhouse, their growth rates are similar. Multiple sets of suspension devices 2 can be connected in series, that is, multiple sets of suspension devices 2 can be connected together by connecting rods to realize synchronous winding of the traction rope, that is, synchronous adjustment of the height of the gas replenishment device 1. Alternatively, a motor 205 can be used to directly drive a single spindle 203 to rotate and adjust. With the help of the wireless data transmission capability of ESP8266, the data can be transmitted to the host computer for regional network control, which can also realize multi-region linkage control.

[0064] When using:

[0065] First, fix the fixing seat 202 to the top of the greenhouse, and wrap the traction rope inside the outer roller 201. In the initial state, the gas supply device 1 is at the highest position. According to the height of the plants below, pull down the gas supply device 1 to a suitable height, which should be higher than the top of the plants and not interfere with the growth of the plants.

[0066] When the gas supply pipeline is connected, the fan 105 starts and introduces the airflow above the gas replenishment device 1 into the detection chamber 109. The gas concentration sensor 106 detects the carbon dioxide concentration in the airflow and combines it with the output signal of the light intensity sensor 111 (e.g., a photoresistor) to determine the ambient light intensity and adjust the opening and closing of the electric valve to change the gas supply speed.

[0067] If the light intensity sensor 111 reports strong light and the gas concentration sensor 106 reports low carbon dioxide concentration, then the opening and closing amount of the electric valve will be increased to increase the gas supply speed. If the slope of the carbon dioxide concentration rise curve reported by the gas concentration sensor 106 increases, then the opening and closing amount of the electric valve will be decreased to slow down the gas supply.

[0068] For some plants that require extended light exposure to shorten maturation time, supplemental lighting (104) can be turned on when weak ambient light is detected. For crops that do not require shortening maturation time, aeration can be stopped when weak ambient light is detected to ensure sufficient oxygen in the air for plant respiration.

[0069] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A carbon dioxide automatic replenishing device for a greenhouse, characterized in that: include, A gas replenishing device (1) comprises a light intensity sensor (111) for detecting ambient light, a gas concentration sensor (106) for detecting gas concentration, and a gas releasing device capable of regulating the gas release rate according to output signals of the light intensity sensor (111) and the gas concentration sensor (106); The suspension device (2) comprises a traction rope for suspending the gas replenishing device (1) and a height adjustment device capable of changing the actual working length of the traction rope.

2. The automatic carbon dioxide replenishing device for greenhouse according to claim 1 is characterized in that: The gas release device is a rotary structure and releases gas from its outer circumferential surface. The axis of the gas release device is arranged vertically and vertically passes through the detection cavity (109). The gas concentration sensor (106) is built into the detection cavity (109). A fan (105) for promoting airflow is arranged in the detection cavity (109).

3. The automatic carbon dioxide replenishing device for greenhouse according to claim 2 is characterized in that: The fan (105) is an axial flow fan located at the bottom of the detection cavity (109) and blowing air downwards, and both ends of the detection cavity (109) are covered by a metal mesh (110).

4. The automatic carbon dioxide replenishing device for greenhouse according to claim 1 is characterized in that: The gas release device further comprises an annular gas chamber (107), an electric valve is serially connected to a gas supply pipeline of the gas chamber (107), and a diffusion net (102) for gas diffusion is arranged on the outer circumferential surface of the gas chamber (107).

5. The automatic carbon dioxide replenishing device for greenhouse according to claim 1 is characterized in that: An upper cover (101) is provided at the upper end of the gas release device to prevent gas from floating up.

6. The automatic carbon dioxide replenishing device for greenhouse according to claim 5, characterized in that: A fill light (104) is arranged in the gas replenishing device (1), and the upper cover (101) is capable of shielding a light path between the fill light (104) and the light intensity sensor (111).

7. The automatic carbon dioxide replenishing device for greenhouse according to claim 1 is characterized in that: The height adjustment device comprises an outer roller (201) for winding a traction rope, and a core shaft (203) for driving the outer roller (201) to rotate, and a detachable transmission mechanism is provided between the outer roller (201) and the core shaft (203); When the load on the outer roller (201) is too large when winding the traction rope, the transmission mechanism between the core shaft (203) and the outer roller (201) is disengaged.

8. The automatic carbon dioxide replenishing device for greenhouse according to claim 7 is characterized in that: The transmission mechanism comprises a helical spline structure (2033) between the core shaft (203) and the outer roller (201), and an elastic member (204) for limiting the axial relative position between the two. The inclination direction of the helical teeth of the helical spline structure (2033) is consistent with the rotation direction of the outer roller (201) when releasing the traction line.

9. The automatic carbon dioxide replenishing device for greenhouse according to claim 7, characterized in that: The core shaft (203) is externally rotatably provided with a fixing seat (202) for overhead suspension, and the end of the core shaft (203) is provided with a motor (205) or a connector (2032) for connecting to an external driving source.

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