Solar greenhouse microalgae fertilizer in-situ culture device and application system

Abstract

The invention discloses a sunlight greenhouse microalgae fertilizer in-situ culture device and an application system, and belongs to the field of microalgae fertilizer in-situ application, the device comprises a wall body, the upper part of the wall body is fixedly connected with a storage box, the wall surface of the wall body is provided with an S-shaped pipeline, one end of the S-shaped pipeline is communicated with the storage box, and the other end of the S-shaped pipeline is communicated with the application system; a return pipe is communicated between the other end of the S-shaped pipeline and the storage box through a shunt pipe; the flow dividing pipe is communicated with a plurality of branch pipes, the plurality of branch pipes are communicated with the S-shaped pipeline, electromagnetic three-way valves are arranged at the joints of the branch pipes and the S-shaped pipeline, and the plurality of electromagnetic three-way valves run from morning to evening along with time, so that the flowing distance of the algae liquid in the storage box in the S-shaped pipeline is gradually shortened; according to the device, the S-shaped pipeline and the electromagnetic three-way valve are matched for use, so that the flowing path of chlorella liquid in the S-shaped pipeline is adjusted according to the sunlight intensity, and the light receiving time and the light receiving area of chlorella are controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of in-situ cultivation of microalgae fertilizers, and specifically provides a device and application system for in-situ cultivation of microalgae fertilizers in a solar greenhouse. Background Art

[0002] In agricultural production, microalgae fertilizers, due to their rich variety of nutrients, play a significant role in improving soil fertility and promoting crop growth, and thus have broad application prospects. Traditional production of microalgae fertilizers is usually carried out in a centralized manner in professional factories, which leads to subsequent complex transportation processes and proper storage conditions. During transportation, microalgae fertilizers may be affected by factors such as temperature changes; in the storage link, if the conditions are not properly controlled, the activity of microalgae will also be greatly reduced. All these factors increase the production cost and quality risk of microalgae fertilizers.

[0003] With the wide popularization of solar greenhouses in agricultural planting, their unique environmental conditions bring new possibilities for the in-situ cultivation of microalgae fertilizers. Solar greenhouses can provide sufficient light and a relatively stable temperature environment, which are key conditions necessary for the growth of microalgae. However, when using solar greenhouses for microalgae cultivation to produce microalgae fertilizers, there are still many problems to be solved urgently. The light intensity varies significantly throughout the day. In the morning, the light is relatively weak, making it difficult for microalgae to fully carry out photosynthesis and resulting in low growth efficiency; at noon, the light intensity reaches its peak. At this time, the excessive light not only easily damages microalgae cells but also causes the temperature of the culture solution to rise sharply, which is also not conducive to the growth of microalgae; at night, microalgae mainly carry out respiration and hardly require light. Existing microalgae cultivation devices often lack effective control means when dealing with such a drastic change in light intensity over time and cannot control the light exposure time and light-receiving area of microalgae. This leads to slow growth of microalgae, an extended cultivation cycle, increased production costs, and it is difficult to meet the urgent needs of agricultural production for high-efficiency and low-cost microalgae fertilizers. Summary of the Invention

[0004] The purpose of the present invention is to provide a device and application system for in-situ cultivation of microalgae fertilizers in a solar greenhouse, which solves the problem that existing devices are not convenient for adjusting microalgae cultivation conditions according to light changes.

[0005] To achieve the above object, the present invention provides the following technical solution: A device for in-situ cultivation of microalgae fertilizers in a solar greenhouse, including a wall, on the upper part of which a storage tank is fixedly connected, and an S-shaped pipe is installed on the wall surface of the wall. One end of the S-shaped pipe is communicated with the storage tank, and the other end of the S-shaped pipe is communicated with the storage tank through a return pipe via a shunt pipe;

[0006] A plurality of branch pipes are connected to the shunt pipe, and the plurality of branch pipes are all connected to the S-shaped pipe. An electromagnetic three-way valve is provided at the connection between the branch pipe and the S-shaped pipe. The plurality of electromagnetic three-way valves operate from early to late over time, so that the distance of the algal liquid flowing in the S-shaped pipe in the storage tank gradually shortens.

[0007] Preferably, a water pump is connected to the shunt pipe.

[0008] Preferably, a mounting plate is fixedly connected to the wall. The storage tank is fixedly connected to the upper surface of the mounting plate. A rectangular cylinder is fixedly connected to the upper surface of the mounting plate. A rectangular plate is slidably connected in the rectangular cylinder. A liquid suction pipe is communicated in the rectangular cylinder. A plurality of evacuation pipes are communicated with the liquid suction pipe, and the plurality of evacuation pipes are respectively communicated with a part between two electromagnetic three-way valves on the S-shaped pipe.

[0009] Preferably, the whole S-shaped pipe is inclined towards the liquid suction pipe, so that the algal liquid in each section between the two electromagnetic three-way valves on the S-shaped pipe can converge at the connection part with the corresponding evacuation pipe.

[0010] Preferably, a first electric telescopic rod is fixedly connected to the mounting plate, and the output end of the first electric telescopic rod is fixedly connected to the rectangular plate.

[0011] Preferably, the storage tank is located in the rectangular cylinder, and the storage tank is in contact with the inner wall of the rectangular cylinder. The liquid suction pipe penetrates through the side wall of the storage tank and is communicated with the internal space of the rectangular cylinder;

[0012] A second electric telescopic rod is fixedly connected in the storage tank. The output end of the second electric telescopic rod is fixedly connected with a conical plate. A conical hole matched with the conical plate is formed in the side wall of the storage tank where the storage tank is located in the rectangular cylinder. When any electromagnetic three-way valve operates, the second electric telescopic rod extends, so that the conical plate blocks the conical hole. Then the first electric telescopic rod operates, so that the residual algal liquid in the S-shaped pipe is evacuated.

[0013] Preferably, it further includes a carbon dioxide inlet pipe. A plurality of shunt pipes are provided on the carbon dioxide inlet pipe, and the plurality of shunt pipes are respectively communicated with the liquid outflow direction of the electromagnetic three-way valve on the S-shaped pipe;

[0014] One-way valves are provided on the plurality of shunt pipes. When negative pressure is generated in the S-shaped pipe, carbon dioxide can enter the S-shaped pipe through the carbon dioxide inlet pipe.

[0015] A solar greenhouse microalgae fertilizer application system includes an in-situ cultivation device for microalgae fertilizer in a solar greenhouse, and also includes a material taking cylinder. The material taking cylinder is connected to the shunt pipe. A piston plate is slidably connected in the material taking cylinder. A spectrophotometer is arranged in the storage tank. After the spectrophotometer detects that the density of the algal liquid meets the standard, the piston plate in the material taking cylinder slides upward to extract the algal liquid.

[0016] Preferably, it further includes a proportioning cylinder. A piston plate is slidably connected in the proportioning cylinder. The piston plate in the proportioning cylinder slides upward at the same distance as the piston plate in the material taking cylinder.

[0017] The bottom of the material taking cylinder is connected to a first discharge pipe. The bottom of the proportioning cylinder is connected to a pumping pipe and a second discharge pipe. The pumping pipe is connected to an external diluent supply. The first discharge pipe and the second discharge pipe are jointly connected to a drip irrigation mechanism.

[0018] Preferably, it further includes a supplementary cylinder. The inner diameter of the supplementary cylinder is equal to the inner diameter of the material taking cylinder. A piston plate is slidably connected in the supplementary cylinder. The piston plate in the supplementary cylinder moves synchronously and at the same distance as the piston plate in the material taking cylinder.

[0019] The bottom of the supplementary cylinder is connected to a nutrient solution extraction pipe and a nutrient solution pumping pipe. The nutrient solution extraction pipe is connected to an external nutrient solution supply. The nutrient solution pumping pipe is connected to the storage tank.

[0020] The lower surface of the mounting plate is fixedly connected to a hydraulic rod. The three piston plates are all fixedly connected to the output end of the hydraulic rod.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] By setting the combined use of an S-shaped pipeline and an electromagnetic three-way valve, the present invention realizes adjusting the flow path of the algal solution in the S-shaped pipeline according to the sunlight intensity, thereby controlling the light exposure time and light exposure area of the microalgae. When the sunlight is weak in the morning, the electromagnetic three-way valve makes the algal solution flow through a longer path to fully absorb the limited sunlight; as the sunlight gradually intensifies, the electromagnetic three-way valve adjusts to make the path through which the algal solution flows gradually shorten, avoiding damage to the microalgae cells caused by excessive sunlight. This dynamic regulation mechanism significantly improves the growth efficiency of the microalgae, shortens the cultivation cycle, and reduces the production cost. In addition, the sunlight greenhouse microalgae fertilizer application system of the present invention realizes the automatic application of the microalgae fertilizer through the combined use of a material extraction cylinder, a proportioning cylinder, and a supplement cylinder. When the spectrophotometer detects that the density of the algal solution reaches the standard, the piston plate slides upward to extract the algal solution, and at the same time, the piston plate in the proportioning cylinder slides upward equidistantly to extract the external diluent. The two are mixed in the drip irrigation mechanism and then applied to the crops. In addition, the supplement cylinder synchronously extracts the external nutrient solution and pumps it back to the storage tank to provide nutrients for the next round of cultivation. This automatic application system not only improves the application efficiency but also ensures the uniform application of the microalgae fertilizer, further enhancing the growth effect of the crops. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 is a schematic diagram of the structure at the S-shaped pipeline of the present invention;

[0025] Figure 3 is a schematic diagram of the structure at the first electric telescopic rod of the present invention;

[0026] Figure 4 is a schematic diagram of the flow structure of the algal solution of the present invention Figure 1 ;

[0027] Figure 5 is a schematic diagram of the flow structure of the algal solution of the present invention Figure 2 ;

[0028] Figure 6 is a schematic diagram of the structure at the proportioning cylinder of the present invention.

[0029] In the figure: 100, wall; 110, mounting plate; 200, storage tank; 210, S-shaped pipe; 220, shunt pipe; 221, branch pipe; 222, electromagnetic three-way valve; 230, return pipe; 240, carbon dioxide inlet pipe; 241, shunt pipe; 242, one-way valve; 250, rectangular cylinder; 260, rectangular plate; 261, first electric telescopic rod; 270, liquid extraction pipe; 271, evacuation pipe; 280, second electric telescopic rod; 281, conical plate; 290, water pump; 300, hydraulic rod; 310, material taking cylinder; 311, first discharge pipe; 320, proportioning cylinder; 321, second discharge pipe; 322, material extraction pipe; 330, supplement cylinder; 331, nutrient solution extraction pipe; 332, nutrient solution pumping pipe. Detailed implementation manner

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] Referring to Figures 1 - 5 , this embodiment provides a technical solution: a microalgae fertilizer in-situ cultivation device for a solar greenhouse, including a wall 100. A storage tank 200 is fixedly connected to the upper part of the wall 100. An S-shaped pipe 210 is installed on the wall surface of the wall 100. One end of the S-shaped pipe 210 is communicated with the storage tank 200, and a return pipe 230 is communicated between the other end of the S-shaped pipe 210 and the storage tank 200 through a shunt pipe 220; a plurality of branch pipes 221 are communicated with the shunt pipe 220. The plurality of branch pipes 221 are all communicated with the S-shaped pipe 210, and an electromagnetic three-way valve 222 is provided at the connection between the branch pipe 221 and the S-shaped pipe 210. The plurality of electromagnetic three-way valves 222 operate from morning to evening over time, so that the distance of the algal liquid in the storage tank 200 flowing in the S-shaped pipe 210 gradually shortens.

[0032] The wall 100 is the wall of the greenhouse. The wall 100 has three sides, and an S-shaped pipe 210 is provided on each side of the wall 100. The S-shaped pipe 210 is a photobioreactor. The algal liquid in the storage tank 200 flows out from the S-shaped pipe 210, then flows into the return pipe 230 through the shunt pipe 220, and then flows back into the storage tank 200 from the return pipe 230. When the algal liquid flows in the S-shaped pipe 210, it undergoes light irradiation for reaction and growth;

[0033] Taking Chlorella as an example, the in-situ cultivation of microalgae fertilizer is carried out. In the morning, the light intensity is relatively weak, and it is necessary to increase the light exposure time and area of Chlorella. At noon, the light intensity is the strongest. To avoid damage to Chlorella caused by excessive light and prevent the culture solution temperature from being too high, it is necessary to reduce the light exposure time and area of Chlorella. At night, Chlorella mainly conducts respiration, and the demand for light is zero. At this time, the flow of the algal solution is stopped, and the flow distance of the algal solution in the S-shaped pipe 210 can also be shortened, the circulation rate of the culture solution can be reduced, the energy consumption can be lowered, and at the same time, it is also beneficial to maintain the stability of the culture environment and reduce the interference of external factors on Chlorella cells;

[0034] The control system obtains the time and controls the operation of each electromagnetic three-way valve 222. In the morning, the electromagnetic three-way valve 222 at the connection between the tail end of the S-shaped pipe 210 and the shunt pipe 220 operates, so that the tail end of the S-shaped pipe 210 is connected to the shunt pipe 220. At this time, the algal solution flows through the entire length of the S-shaped pipe 210, so the light exposure area and time of the algal solution can be increased;

[0035] As time goes by, the electromagnetic three-way valve 222 at the tail of the S-shaped pipe 210 operates again to disconnect the connection between the tail of the S-shaped pipe 210 and the shunt pipe 220. The electromagnetic three-way valve 222 at the second tail operates to connect with the shunt pipe 220, and the other electromagnetic three-way valves 222 operate, so that only the part of the S-shaped pipe 210 with the electromagnetic three-way valve 222 at the second tail is connected to the shunt pipe 220. At this time, the algal solution will no longer flow through the part between the electromagnetic three-way valves 222 at the second tail and the tail of the S-shaped pipe 210, thereby reducing the light exposure time and area of Chlorella. And so on, the electromagnetic three-way valves 222 from the tail to the head of the S-shaped pipe 210 operate one by one with time, gradually shortening the flow distance of the algal solution in the S-shaped pipe 210, so that the light exposure time and area of Chlorella can gradually shrink with the change of time from morning to evening, so as to adapt to the growth needs of Chlorella and improve the growth efficiency of Chlorella.

[0036] A water pump 290 is connected to the shunt pipe 220.

[0037] The setting of the water pump 290 enables the flow of the algal solution to be driven by power, and the operating speed of the water pump 290 is adjusted according to actual needs to avoid large shear forces on Chlorella.

[0038] An installation plate 110 is fixedly connected to the wall 100, the storage tank 200 is fixedly connected to the upper surface of the installation plate 110, a rectangular cylinder 250 is fixedly connected to the upper surface of the installation plate 110, a rectangular plate 260 is slidably connected in the rectangular cylinder 250, a liquid extraction pipe 270 is communicated in the rectangular cylinder 250, and a plurality of evacuation pipes 271 are communicated with the liquid extraction pipe 270. The plurality of evacuation pipes 271 are respectively communicated with the part between two electromagnetic three-way valves 222 on the S-shaped pipe 210.

[0039] To prevent the algal liquid remaining in the part of the S-shaped pipe 210 after the connection part between the electromagnetic three-way valve 222 and the shunt pipe 220 from being damaged due to lack of flow, when the electromagnetic three-way valve 222 operates, the rectangular plate 260 slides inside the rectangular cylinder 250, causing a negative pressure to be generated inside the rectangular cylinder 250. The negative pressure is transmitted to the inside of the S-shaped pipe 210 through the liquid extraction pipe 270 and the evacuation pipe 271, so that the algal liquid remaining in the part of the S-shaped pipe 210 after the connection part between the electromagnetic three-way valve 222 and the shunt pipe 220 is extracted into the rectangular cylinder 250.

[0040] The whole of the S-shaped pipe 210 is inclined towards the liquid extraction pipe 270, so that the algal liquid in each section of the S-shaped pipe 210 between the two electromagnetic three-way valves 222 can converge at the connection part with the corresponding evacuation pipe 271.

[0041] As Figure 4 and Figure 5 shown, the S-shaped pipe 210 is inclined, and the bottom of each section of the S-shaped pipe 210 between the two electromagnetic three-way valves 222 communicates with the evacuation pipe 271 on the liquid extraction pipe 270, so that the algal liquid in the idle section of the S-shaped pipe 210 can flow towards the connection part of the evacuation pipe 271 under the action of gravity, thus ensuring the evacuation effect of the algal liquid and avoiding excessive algal liquid remaining in the idle section of the S-shaped pipe 210;

[0042] It should be noted here that the part where the algal liquid flows in the S-shaped pipe 210 is the working section of the S-shaped pipe 210, and the part where the algal liquid does not flow in the S-shaped pipe 210 is the idle section of the S-shaped pipe 210.

[0043] A first electric telescopic rod 261 is fixedly connected to the mounting plate 110, and the output end of the first electric telescopic rod 261 is fixedly connected to the rectangular plate 260.

[0044] The first electric telescopic rod 261 is controlled to expand and contract by the control system. The distances between the electromagnetic three-way valves 222 on the S-shaped pipe 210 are equal. When the electromagnetic three-way valves 222 operate, the control system controls the first electric telescopic rod 261 to shorten, so that the rectangular cylinder 250 extracts the algal liquid in the part of the S-shaped pipe 210 between the two electromagnetic three-way valves 222.

[0045] The storage tank 200 is located inside the rectangular cylinder 250, and the storage tank 200 is in contact with the inner wall of the rectangular cylinder 250. The liquid extraction pipe 270 penetrates through the side wall of the storage tank 200 and communicates with the internal space of the rectangular cylinder 250. A second electric telescopic rod 280 is fixedly connected inside the storage tank 200, and the output end of the second electric telescopic rod 280 is fixedly connected with a conical plate 281. A conical hole matching the conical plate 281 is formed on the side wall of the storage tank 200 located inside the rectangular cylinder 250. When any electromagnetic three-way valve 222 operates, the second electric telescopic rod 280 extends to make the conical plate 281 block the conical hole. Subsequently, the first electric telescopic rod 261 operates to evacuate the residual algal liquid in the S-shaped pipe 210.

[0046] When the first electric telescopic rod 261 is not operating, the second electric telescopic rod 280 is in a retracted state. At this time, the conical plate 281 is away from the conical hole, so that the internal space of the rectangular cylinder 250 communicates with the storage tank 200. At this time, the algal liquid in the rectangular cylinder 250 and the storage tank 200 is powered by the water pump 290 and all flows through the S-shaped pipe 210. When the electromagnetic three-way valve 222 operates, in order to evacuate the algal liquid in the idle section of the S-shaped pipe 210, the second electric telescopic rod 280 first extends to make the conical plate 281 block the conical hole, so that the space between the rectangular plate 260 and the storage tank 200 in the rectangular cylinder 250 is sealed. Thus, when the first electric telescopic rod 261 shortens and pulls the rectangular plate 260 to slide, a negative pressure can be generated in the rectangular cylinder 250 to extract the algal liquid in the idle section of the S-shaped pipe 210.

[0047] It further includes a carbon dioxide inlet pipe 240. A plurality of shunt pipes 241 are arranged on the carbon dioxide inlet pipe 240, and the plurality of shunt pipes 241 are respectively communicated with the liquid outflow direction of the electromagnetic three-way valve 222 on the S-shaped pipe 210. One-way valves 242 are arranged on the plurality of shunt pipes 241. When a negative pressure is generated in the S-shaped pipe 210, carbon dioxide can enter the S-shaped pipe 210 through the carbon dioxide inlet pipe 240.

[0048] To reduce the resistance of extracting the algal liquid in the idle section of the S-shaped pipe, when the rectangular plate 260 slides, carbon dioxide enters the idle section of the S-shaped pipe 210 that needs to extract the residual algal liquid through the carbon dioxide inlet pipe 240, so that the algal liquid in the idle section can be smoothly extracted.

[0049] It should be noted again that each section of the S-shaped pipe 210 without algal liquid flow between the two electromagnetic three-way valves 222 is an idle section. Under the control of the electromagnetic three-way valve 222, each idle section is not connected to each other and is not connected to the shunt pipe 220 either. Thus, the carbon dioxide injected through the carbon dioxide inlet pipe 240 can enter the rectangular cylinder 250 through the liquid extraction pipe 270, which is convenient for the utilization of Chlorella.

[0050] Refer toFigure 6 , a microalgae fertilizer application system for a solar greenhouse, including an in-situ cultivation device for microalgae fertilizer in the solar greenhouse, and further including a material extraction cylinder 310. The material extraction cylinder 310 is connected to a shunt pipe 220. A piston plate is slidably connected inside the material extraction cylinder 310. A spectrophotometer is provided inside a storage tank 200. After the spectrophotometer detects that the density of the algal liquid meets the standard, the piston plate inside the material extraction cylinder 310 slides upward, thereby extracting the algal liquid.

[0051] Draw a standard curve of absorbance versus cell density in advance, and then find the corresponding cell density from the standard curve according to the absorbance of the sample. The spectrophotometer measures the absorbance of the Chlorella culture solution at a specific wavelength. After setting the absorbance, after the control system detects that the absorbance reaches, it controls the piston plate inside the material extraction cylinder 310 to slide upward. Thus, the material extraction cylinder 310 extracts the algal liquid through the shunt pipe 220, and the extracted algal liquid is used for later drip irrigation.

[0052] It further includes a proportioning cylinder 320. A piston plate is slidably connected inside the proportioning cylinder 320. The piston plate inside the proportioning cylinder 320 slides upward at the same distance as the piston plate inside the material extraction cylinder 310. The bottom of the material extraction cylinder 310 is connected to a first discharge pipe 311. The bottom of the proportioning cylinder 320 is connected to a material extraction pipe 322 and a second discharge pipe 321. The material extraction pipe 322 is connected to an external diluent supply. The first discharge pipe 311 and the second discharge pipe 321 are jointly connected to a drip irrigation mechanism.

[0053] Since the algal liquid needs to be diluted before use, according to the dilution ratio of the algal liquid, set the volume ratio of the proportioning cylinder 320 to the material extraction cylinder 310. When the piston plate inside the material extraction cylinder 310 slides upward, the piston plate inside the proportioning cylinder 320 slides upward synchronously. At this time, the amount of diluent extracted by the proportioning cylinder 320 is a fixed multiple of the amount of algal liquid extracted inside the material extraction cylinder 310, ensuring the proportioning accuracy. Subsequently, the diluent and the algal liquid are discharged to the drip irrigation mechanism through the first discharge pipe 311 and the second discharge pipe 321, stirred, and then drip-irrigated.

[0054] It further includes a supplement cylinder 330. The inner diameter of the supplement cylinder 330 is equal to the inner diameter of the material extraction cylinder 310. A piston plate is slidably connected inside the supplement cylinder 330. The piston plate inside the supplement cylinder 330 moves synchronously and at the same distance as the piston plate inside the material extraction cylinder 310. The bottom of the supplement cylinder 330 is connected to a nutrient solution extraction pipe 331 and a nutrient solution pumping pipe 332. The nutrient solution extraction pipe 331 is connected to an external nutrient solution supply. The nutrient solution pumping pipe 332 is connected to the storage tank 200. A hydraulic rod 300 is fixedly connected to the lower surface of the mounting plate 110. All three piston plates are fixedly connected to the output end of the hydraulic rod 300.

[0055] The control system controls the hydraulic rod 300 to shorten. At this time, the hydraulic rod 300 drives the three piston plates to slide down synchronously and equidistantly, so that the material extraction cylinder 310 extracts the algal liquid, the proportioning cylinder 320 extracts the diluent with a fixed multiple of the algal liquid, and the supplement cylinder 330 extracts the nutrient solution equal to the algal liquid. Subsequently, the hydraulic rod 300 extends, and the extracted nutrient solution is discharged back into the storage tank 200 through the nutrient solution pump-out pipe 332. The chlorella in the storage tank 200 continues to reproduce, thereby increasing the density of the chlorella. The algal liquid and the diluent discharged from the material extraction cylinder 310 and the proportioning cylinder 320 are mixed and then used.

[0056] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An in-situ cultivation device for microalgae fertilizer in a solar greenhouse, comprising a wall body (100), characterized in that: A storage tank (200) is fixedly connected to the upper part of the wall body (100). An S-shaped pipe (210) is installed on the wall surface of the wall body (100). One end of the S-shaped pipe (210) is communicated with the storage tank (200), and a reflux pipe (230) is communicated between the other end of the S-shaped pipe (210) and the storage tank (200) through a shunt pipe (220). A plurality of branch pipes (221) are communicated with the shunt pipe (220). The plurality of branch pipes (221) are all communicated with the S-shaped pipe (210), and an electromagnetic three-way valve (222) is arranged at the connection part between the branch pipe (221) and the S-shaped pipe (210). The plurality of electromagnetic three-way valves (222) operate from morning to evening over time, so that the distance of the algal liquid flowing in the S-shaped pipe (210) from the storage tank (200) gradually shortens.

2. The in-situ cultivation device for microalgae fertilizer in a solar greenhouse according to claim 1, wherein: A water pump (290) is connected to the shunt pipe (220).

3. The in-situ cultivation device of microalgae fertilizer in a solar greenhouse according to claim 2, wherein: A mounting plate (110) is fixedly connected to the wall body (100). The storage tank (200) is fixedly connected to the upper surface of the mounting plate (110). A rectangular cylinder (250) is fixedly connected to the upper surface of the mounting plate (110). A rectangular plate (260) is slidably connected in the rectangular cylinder (250). A liquid suction pipe (270) is communicated in the rectangular cylinder (250). A plurality of evacuation pipes (271) are communicated with the liquid suction pipe (270). The plurality of evacuation pipes (271) are respectively communicated with the part between two electromagnetic three-way valves (222) on the S-shaped pipe (210).

4. The in-situ cultivation device of microalgae fertilizer in a solar greenhouse according to claim 3, characterized in that: The whole S-shaped pipe (210) is inclined towards the liquid suction pipe (270), so that the algal liquid in each section of the part between the two electromagnetic three-way valves (222) on the S-shaped pipe (210) can converge at the connection part with the corresponding evacuation pipe (271).

5. The in-situ cultivation device of microalgae fertilizer in a solar greenhouse according to claim 4, characterized in that: A first electric telescopic rod (261) is fixedly connected to the mounting plate (110). The output end of the first electric telescopic rod (261) is fixedly connected to the rectangular plate (260).

6. The in-situ cultivation device for microalgae fertilizer in a solar greenhouse according to claim 5, characterized in that: The storage tank (200) is located in the rectangular cylinder (250), and the storage tank (200) is in contact with the inner wall of the rectangular cylinder (250). The liquid suction pipe (270) penetrates through the side wall of the storage tank (200) and is communicated with the internal space of the rectangular cylinder (250). A second electric telescopic rod (280) is fixedly connected in the storage tank (200). The output end of the second electric telescopic rod (280) is fixedly connected with a conical plate (281). A conical hole matched with the conical plate (281) is formed in the side wall of the storage tank (200) located in the rectangular cylinder (250). When any electromagnetic three-way valve (222) operates, the second electric telescopic rod (280) extends, so that the conical plate (281) blocks the conical hole. Then the first electric telescopic rod (261) operates, so that the residual algal liquid in the S-shaped pipe (210) is evacuated.

7. The in-situ cultivation device of microalgae fertilizer in a solar greenhouse according to claim 6, characterized in that: It further includes a carbon dioxide inlet pipe (240), and a plurality of shunt pipes (241) are arranged on the carbon dioxide inlet pipe (240), and the plurality of shunt pipes (241) are respectively communicated with the liquid outflow direction of the electromagnetic three-way valve (222) on the S-shaped pipe (210); One-way valves (242) are arranged on the plurality of shunt pipes (241), and when negative pressure is generated in the S-shaped pipe (210), carbon dioxide can enter the S-shaped pipe (210) through the carbon dioxide inlet pipe (240).

8. A solar greenhouse microalgae fertilizer application system, comprising the solar greenhouse microalgae fertilizer in-situ cultivation device according to any one of claims 1-7, characterized in that: It further includes a material taking cylinder (310), the material taking cylinder (310) is communicated with the shunt pipe (220), a piston plate is slidably connected in the material taking cylinder (310), a spectrophotometer is arranged in the storage tank (200), and after the spectrophotometer detects that the density of the algal liquid reaches the standard, the piston plate in the material taking cylinder (310) slides upward to extract the algal liquid.

9. The microalgae fertilizer application system for solar greenhouse according to claim 8, characterized in that: It further includes a proportioning cylinder (320), a piston plate is slidably connected in the proportioning cylinder (320), and the piston plate in the proportioning cylinder (320) slides upward at an equal distance from the piston plate in the material taking cylinder (310); The bottom of the material taking cylinder (310) is communicated with a first discharge pipe (311), the bottom of the proportioning cylinder (320) is communicated with a pumping pipe (322) and a second discharge pipe (321), the pumping pipe (322) is connected to an external diluent supply, and the first discharge pipe (311) and the second discharge pipe (321) are jointly connected to a drip irrigation mechanism.

10. The microalgae fertilizer application system for solar greenhouse according to claim 9, wherein: It further includes a supplementary cylinder (330), the inner diameter of the supplementary cylinder (330) is equal to the inner diameter of the material taking cylinder (310), a piston plate is slidably connected in the supplementary cylinder (330), and the piston plate in the supplementary cylinder (330) moves synchronously and at an equal distance from the piston plate in the material taking cylinder (310); The bottom of the supplementary cylinder (330) is communicated with a nutrient solution extraction pipe (331) and a nutrient solution pumping pipe (332), the nutrient solution extraction pipe (331) is connected to an external nutrient solution supply, and the nutrient solution pumping pipe (332) is communicated with the storage tank (200); The lower surface of the mounting plate (110) is fixedly connected with a hydraulic rod (300), and the three piston plates are all fixedly connected to the output end of the hydraulic rod (300).

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