Greenhouse ventilation system

Abstract

The utility model relates to the technical field of greenhouses, and particularly discloses a greenhouse ventilation system which comprises a ventilation pipeline, a ventilation control mechanism and an air supply mechanism. The ventilation pipeline comprises an input pipeline and an output pipeline, one section of the input pipeline is buried in the greenhouse ground, the other section of the input pipeline is located on the side wall of the greenhouse, a plurality of first ventilation openings are formed in the pipe wall of the input pipeline, one section of the output pipeline is arranged at the top end of the greenhouse, and the other section of the output pipeline is located on the side wall of the greenhouse. A plurality of second ventilation openings are formed in the pipe wall of the output pipeline; the ventilation control mechanism is connected with the outer wall of the input pipeline and the outer wall of the output pipeline and used for controlling the communication state of the first ventilation opening and the second ventilation opening. The air supply mechanism communicates with the ventilation pipeline and is used for controlling air flow in the ventilation pipeline. The ventilation device has the effect of reducing energy consumption in the ventilation process of the greenhouse.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of greenhouses, in particular to a greenhouse ventilation system. BACKGROUND

[0002] The ventilation system of a greenhouse has the ability to introduce air with lower temperature outside into the greenhouse when the temperature inside is higher to achieve the effect of cooling. The ventilation system of a greenhouse also has the ability to provide fresh air outside into the greenhouse to increase the concentration of carbon dioxide inside the greenhouse, and to discharge air with higher oxygen concentration inside the greenhouse due to the photosynthesis of plants. At the same time, the ventilation system of a greenhouse can reduce the probability of plant diseases in the greenhouse by ventilating the greenhouse.

[0003] In a greenhouse, cold air with large air density deposits at the bottom of the greenhouse, and hot air with small air density rises and gathers at the top of the greenhouse. During the use of the greenhouse, the required ventilation conditions in the greenhouse are different due to different external climate conditions of the greenhouse. When the external climate is high temperature or low temperature, the air entering the greenhouse needs to be cooled or heated, which consumes a lot of energy in the process. CONTENT OF THE INVENTION

[0004] In order to reduce the energy consumption in the ventilation process of the greenhouse, the present application provides a greenhouse ventilation system.

[0005] The greenhouse ventilation system provided by the present application adopts the following technical scheme:

[0006] A greenhouse ventilation system comprises:

[0007] A ventilation pipeline comprises an input pipeline and an output pipeline. One section of the input pipeline is buried in the ground of the greenhouse, and the other section of the input pipeline is located in the side wall of the greenhouse. A plurality of first ventilation openings are formed in the wall of the input pipeline. One section of the output pipeline is arranged at the top of the greenhouse, and the other section of the output pipeline is located in the side wall of the greenhouse. A plurality of second ventilation openings are formed in the wall of the output pipeline.

[0008] A ventilation control mechanism is connected to the outer wall of the input pipeline and the outer wall of the output pipeline, and is used to control the communication state of the first ventilation openings and the second ventilation openings.

[0009] An air supply mechanism is connected to the ventilation pipeline, and is used to control the air flow in the ventilation pipeline.

[0010] When the temperature in the greenhouse is too high, the ventilation control mechanism controls the first ventilation opening at the bottom end of the greenhouse to be opened, and the ventilation mechanism controls the second ventilation opening at the top end of the greenhouse to be opened, so that the air in the greenhouse flows from the bottom end to the top end of the greenhouse, the air with a high temperature gathered in the greenhouse is discharged from the top end of the greenhouse, and the air with a relatively low temperature in the greenhouse moves to the top end of the greenhouse under the action of the external air input through the first ventilation opening, thereby achieving the effect of reducing the temperature of the air in the greenhouse. At the same time, the air flowing from the bottom end to the top end of the greenhouse can enhance the transpiration of the plants, further reduce the temperature in the greenhouse, and thereby reduce the energy consumption of the ventilation system in the greenhouse when the temperature in the greenhouse needs to be reduced. When the temperature in the greenhouse and the temperature outside are both suitable for plant growth, the ventilation control mechanism controls the first ventilation opening on the section of the pipeline connected to the side wall of the greenhouse to be opened, and the second ventilation opening on the section of the pipeline connected to the side wall of the greenhouse to be opened, so that the air in the greenhouse flows from the first ventilation opening to the second ventilation opening, thereby reducing the energy consumption required for the greenhouse ventilation system to transport air to the bottom end of the greenhouse. Ultimately, the energy consumption consumed in the greenhouse ventilation process is reduced.

[0011] Optionally, the ventilation control mechanism comprises an in-pipe communication controller and an out-pipe communication controller, the side wall of the ventilation pipeline is provided with a control groove, the in-pipe communication controller is slidably arranged in the control groove, and the out-pipe communication controller is connected to one end of the in-pipe communication controller located outside the ventilation pipeline. The out-pipe communication controller is used to cover the first ventilation opening and / or the second ventilation opening.

[0012] By adopting the above technical scheme, the ventilation control mechanism controls the pipe sections of the input pipeline and the output pipeline in the ventilation pipeline through the in-pipe communication controller, and cooperates with the out-pipe communication controller to cover the first ventilation opening and the second ventilation opening on the pipe section that is not working, thereby controlling the position of the input air and the position of the output air in the greenhouse.

[0013] Optionally, the in-pipe communication controller comprises a driving motor, a blocking piece and a leakage-proof cover, the driving motor is connected to the outer wall of the ventilation pipeline, the blocking piece is fixedly connected to the output shaft of the driving motor, the side wall of the blocking piece slidably abuts against the groove wall of the control groove, and the leakage-proof cover covers the blocking piece and the driving motor. One end of the leakage-proof cover close to the ventilation pipeline is in sealing abutment with the side wall of the ventilation pipeline.

[0014] By adopting the technical scheme, the leakage-proof cover reduces the probability of the air conveyed in the ventilation pipeline flowing out from the in-pipe communication controller, and when the in-pipe communication controller works, the driving motor drives the blocking piece to rotate in the control groove, so that the blocking piece enters or exits the ventilation pipeline, thereby achieving the function of blocking or communicating one section of the ventilation pipeline.

[0015] Optionally, the out-pipe communication controller comprises a connecting baffle, the connecting baffle is used for covering the first ventilation opening and / or the second ventilation opening, one side of the connecting baffle is connected with a rotating shaft, one end of the rotating shaft is connected with a rotating motor, and the rotating motor is electrically connected with the driving motor.

[0016] By adopting the technical scheme, the rotating motor controls the rotation of the rotating shaft, so as to drive the connecting baffle to rotate, and the connecting baffle can cover the first ventilation opening or the second ventilation opening under the action of the rotating motor, thereby achieving the control of the air outlet position and the control of the air inlet position in the greenhouse.

[0017] Optionally, the air feeding mechanism is connected with the section of the input pipeline connected with the greenhouse side wall, the in-pipe communication controller is arranged between the section of the input pipeline connected with the greenhouse side wall and the section of the input pipeline connected with the greenhouse ground, and the out-pipe communication controller is used for covering the first ventilation opening on the section of the input pipeline connected with the greenhouse side wall.

[0018] By adopting the technical scheme, the air feeding mechanism is connected with the section of the input pipeline connected with the greenhouse side wall, so as to facilitate the installation of the air feeding mechanism, when the in-pipe communication controller blocks the communication of the input pipeline, the air in the input pipeline flows out from the section of the input pipeline connected with the greenhouse side wall, and when the in-pipe communication controller does not block the communication of the input pipeline, the out-pipe communication controller covers the first ventilation opening on the section of the input pipeline connected with the greenhouse side wall, and the air in the input pipeline flows out from the first ventilation opening on the section of the input pipeline connected with the greenhouse ground.

[0019] Optionally, the in-pipe communication controller is located between the section of the output pipeline connected with the greenhouse top end and the section of the output pipeline connected with the greenhouse side wall, the out-pipe communication controller is used for covering the second ventilation opening on the section of the output pipeline connected with the greenhouse top end, and the section of the output pipeline connected with the greenhouse top end is in communication with the outside.

[0020] By adopting the technical scheme, when the in-pipe communication controller blocks the communication of the output pipeline, the air in the greenhouse can only be output through the section of the output pipeline connected with the greenhouse top end, and when the in-pipe communication controller does not block the communication of the output pipeline, the out-pipe communication controller covers the second ventilation opening on the section of the output pipeline connected with the greenhouse top end, and the air in the greenhouse is output through the second ventilation opening on the section of the output pipeline connected with the greenhouse side wall.

[0021] Optionally, a sealing ring is connected to one side of the connecting baffle towards the ventilation duct, and the sealing ring is arranged around the first ventilation opening or the second ventilation opening covered by the connecting baffle.

[0022] By using the above technical scheme, when the connecting baffle covers the first ventilation opening or the second ventilation opening, the sealing ring is arranged around the first ventilation opening or the second ventilation opening, and the sealing ring abuts against the outside of the ventilation duct, thereby further reducing the probability of air leakage of the first ventilation opening or the second ventilation opening covered by the connecting baffle.

[0023] Optionally, the air supply mechanism comprises a conveying fan and a humidifier, the conveying fan is connected to the input duct, and the humidifier is located on one side of the conveying fan towards the input duct.

[0024] By using the above technical scheme, when the humidity in the greenhouse is too low, the air supply mechanism can send the air humidified by the humidifier into the interior of the greenhouse through the conveying fan, thereby improving the air humidity in the greenhouse.

[0025] Optionally, the humidifier comprises a water conveying duct and a water permeable paperboard, one end of the water conveying duct abuts against the water permeable paperboard, and the water permeable paperboard is arranged in the input duct.

[0026] By using the above technical scheme, when the output duct is supplied with water, the water in the water conveying duct can permeate to the surface of the water permeable paperboard, and the flowing air driven by the conveying fan can contact the surface of the water permeable paperboard, thereby evaporating the water on the surface of the water permeable paperboard and bringing the evaporated water into the ventilation duct, and finally conveying the water into the interior of the greenhouse.

[0027] Optionally, the bottom end of the water permeable paperboard is connected with a leakage prevention clamping block, the leakage prevention clamping block is provided with a leakage prevention clamping groove and a connecting hole, a section of the water permeable paperboard is inserted into the leakage prevention clamping groove, the water conveying duct abuts against one side of the water permeable paperboard through the connecting hole, and the groove wall on the other side of the connecting hole and the water conveying duct together clamp the bottom end of the water permeable paperboard.

[0028] By using the above technical scheme, the water permeable paperboard inserted into the leakage prevention groove in the leakage prevention clamping block at the bottom end can reduce the probability of water leakage from the bottom end of the water permeable paperboard in the water conveying duct.

[0029] Compared with the prior art, the present application has at least one of the following beneficial technical effects:

[0030] 1. When the temperature inside the greenhouse is high, the ventilation control mechanism controls the input pipeline to input air into the greenhouse from the section of the greenhouse ground, and controls the output pipeline to output the air inside the greenhouse from the section of the top of the greenhouse, so as to realize the ventilation of the greenhouse, and make the air with low temperature at the bottom of the greenhouse move upwards, and the air with high temperature at the top of the greenhouse be discharged, and at the same time, the air inside the greenhouse passes through the plants from bottom to top, so as to enhance the transpiration of the plants, realize the cooling of the greenhouse, and reduce the energy consumption in the ventilation process of the greenhouse. When the temperature inside the greenhouse and the temperature outside are both suitable for the growth of the plants, the ventilation control mechanism controls the input pipeline to send air from the section of the greenhouse side wall, and controls the output pipeline to discharge the air inside the greenhouse from the section of the greenhouse side wall, so as to reduce the energy consumption of the air sent to the bottom of the greenhouse, and further reduce the energy consumption in the ventilation process of the greenhouse.

[0031] 2. When the ventilation conditions of the input pipeline and the output pipeline are regulated, the in-pipe communication controller controls the communication between the section of the input pipeline connected to the greenhouse side wall and the section of the input pipeline connected to the greenhouse ground, and controls the communication between the section of the output pipeline connected to the greenhouse side wall and the section of the output pipeline connected to the greenhouse ground. The out-pipe communication controller controls the communication condition of the first ventilation port outside the input pipeline, and controls the communication condition of the second ventilation port outside the output pipeline, so as to control the wind direction inside the greenhouse.

[0032] 3. The humidifier is arranged near the delivery fan in the air sending mechanism, so that when the air humidity inside the greenhouse is too low, humid air can be delivered into the greenhouse, so as to improve the air humidity inside the greenhouse. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is the overall structure schematic diagram of the embodiment of the application.

[0034] Figure 2 is the structure schematic diagram of the input pipeline in the embodiment of the application.

[0035] Figure 3 is the structure schematic diagram of the humidifier in the embodiment of the application.

[0036] Figure 4 is the structure schematic diagram of the in-pipe communication controller in the embodiment of the application.

[0037] Figure 5 is the structure schematic diagram of the out-pipe communication controller in the embodiment of the application.

[0038] Fig. 1: 1, ventilation duct; 11, input duct; 111, first ventilation opening; 12, output duct; 121, second ventilation opening; 13, control groove; 2, ventilation control mechanism; 21, in-duct communication controller; 211, driving motor; 212, blocking sheet; 213, leakage-proof cover; 22, out-duct communication controller; 221, connecting baffle; 222, rotating shaft; 223, rotating motor; 224, sealing ring; 3, air supply mechanism; 31, conveying fan; 32, humidifier; 321, water conveying duct; 322, water-permeable paperboard; 323, leakage-proof clamping block; 3231, leakage-proof clamping groove; 3232, connecting hole. DETAILED DESCRIPTION

[0039] The following description will be made in conjunction with the accompanying drawings. Figures 1-5 The present application is further described in detail.

[0040] The present application discloses a greenhouse ventilation system. Referring to Figure 1 and Figure 2 The greenhouse ventilation system comprises a ventilation duct 1, a ventilation control mechanism 2 and an air supply mechanism 3.

[0041] The ventilation duct 1 comprises an input duct 11 and an output duct 12, both of which are arranged in an L shape. One end of the input duct 11 is buried in the greenhouse ground, and the other end of the input duct 11 is connected to the side wall of the greenhouse. A plurality of first ventilation openings 111 are formed in the inner wall of the input duct 11 to communicate with the outside. One end of the output duct 12 is connected to the top end of the greenhouse, and the other end of the output duct 12 is connected to the side wall of the greenhouse. A plurality of second ventilation openings 121 are formed in the inner wall of the output duct 12 to communicate with the outside. The ventilation control mechanism 2 is connected to the outer wall of the input duct 11 and the output duct 12, and is arranged close to the first ventilation openings 111 and the second ventilation openings 121. The air supply mechanism 3 is connected to the input duct 11 and supplies air to the inside of the input duct 11.

[0042] When the temperature in the greenhouse is too high, the ventilation control mechanism 2 controls the air supply of the section of the input duct 11 located in the greenhouse ground, and the air in the greenhouse is discharged through the section of the output duct 12 located at the top end of the greenhouse. In this way, the air with relatively low temperature at the bottom of the greenhouse is blown to the top of the greenhouse, and the air with relatively high temperature at the bottom of the greenhouse is discharged. At the same time, the downward air flow enhances the transpiration of the plants in the greenhouse, and the required energy consumption for cooling the greenhouse is reduced. When the temperature in the greenhouse and the temperature outside are both suitable for plant growth, the ventilation control mechanism 2 controls the air in the greenhouse to flow from the first ventilation openings 111 on the side wall of the greenhouse to the second ventilation openings 121 on the side wall of the greenhouse, thereby reducing the required energy consumption for conveying the air to the bottom end of the greenhouse. Finally, the energy consumption in the greenhouse ventilation process is reduced.

[0043] Referring to Figure 1 and Figure 3The air supply mechanism 3 comprises a conveying fan 31 and a humidifier 32. The conveying fan 31 is connected to the side wall of the greenhouse and arranged outside the greenhouse. The conveying fan 31 is connected to the input pipe 11 towards the inside of the greenhouse. The humidifier 32 is connected to the conveying fan 31 towards the greenhouse and located in the input pipe 11.

[0044] The conveying fan 31 is connected to the input pipe 11 to convey the air outside into the inside of the greenhouse. The humidifier 32 can be activated when the air humidity in the greenhouse is too low to increase the humidity of the air conveyed into the inside of the greenhouse by the conveying fan 31.

[0045] Referring to Figure 1 and Figure 3 , the humidifier 32 comprises a water conveying pipe 321, a water permeable paperboard 322 and a leakage prevention block 323. One end of the water conveying pipe 321 abuts one side of the water permeable paperboard 322. The leakage prevention block 323 is provided with a leakage prevention slot 3231 and a connecting hole 3232. The connecting hole 3232 communicates with the leakage prevention slot 3231. The bottom end of the water permeable paperboard 322 is clamped in the leakage prevention slot 3231. The pipe wall of the water conveying pipe 321 abuts the slot wall of the connecting hole 3232. The end of the water conveying pipe 321 and the slot wall of the leakage prevention slot 3231 jointly clamp the bottom end of the water permeable paperboard 322.

[0046] By conveying water into the conveying pipe, the surface of the water permeable paperboard 322 can be kept wet. The leakage prevention slot 3231 in the leakage prevention block 323 can reduce the probability of water leakage from the bottom end of the water permeable paperboard 322. When the conveying fan 31 conveys the air outside through the surface of the water permeable paperboard 322, the flowing air can evaporate the water on the surface of the water permeable paperboard 322 and carry it into the inside of the greenhouse to increase the air humidity.

[0047] Referring to Figure 1 and Figure 2 , the ventilation control mechanism 2 comprises an inner pipe communication controller 21 and an outer pipe communication controller 22. The middle part of the input pipe 11 and the output pipe 12 are provided with control slots 13. The inner pipe communication controller 21 is arranged in the control slot 13. The outer pipe communication controller 22 is connected to the outer wall of the input pipe 11 and the output pipe 12. The outer pipe communication controller covers the first ventilation port 111 of a section of the input pipe 11 and the second ventilation port 121 of a section of the output pipe 12.

[0048] The inner pipe communication controller 21 and the outer pipe communication controller 22 are used in cooperation to adjust the ventilation of the first ventilation port and the second ventilation port 121 in the input pipe 11 and the output pipe 12 to better achieve the purpose of reducing the energy consumption in the ventilation process of the greenhouse.

[0049] Referring to Figure 1 and Figure 4The in-pipe communication controller 21 comprises a driving motor 211, a blocking sheet 212 and a leakage-proof cover 213. The end of the leakage-proof cover 213 is sealingly connected to the outer wall of the ventilation duct 1. The control groove 13 is located inside the leakage-proof cover 213. The driving motor 211 and the blocking sheet 212 are both arranged inside the leakage-proof cover 213. One side of the driving motor 211 is fixedly connected to the outer wall of the ventilation duct 1. The output shaft of the driving motor 211 is fixedly connected to the blocking sheet 212. The side wall of the blocking sheet 212 is slidingly connected to the groove wall of the control groove 13. When the blocking sheet 212 is located in the ventilation duct 1, the blocking sheet 212 blocks the ventilation duct 1.

[0050] When the in-pipe communication controller 21 works, the driving motor 211 drives the blocking sheet 212 to rotate, thereby controlling the communication state in the ventilation duct 1. The leakage-proof cover 213 can reduce the probability of air in the ventilation duct 1 leaking out of the control groove 13, thereby reducing the probability of the air flow rate at the first ventilation port 111 or the second ventilation port 121 decreasing.

[0051] With reference to Figure 1 and Figure 5 , the out-pipe communication controller 22 comprises a connecting baffle 221, a rotating shaft 222 and a rotating motor 223. One side of the connecting baffle 221 is fixedly connected to the rotating shaft 222. One end of the rotating shaft 222 is fixedly connected to the output shaft of the rotating motor 223. The connecting baffle 221 covers the first ventilation port 111 or the second ventilation port 121. The side of the connecting baffle 221 facing the ventilation duct 1 is connected to a sealing ring 224. When the connecting baffle 221 covers the first ventilation port 111 or the second ventilation port 121, the sealing ring 224 surrounds the first ventilation port 111 or the second ventilation port 121. The side of the sealing ring 224 away from the connecting baffle 221 abuts against the outer wall of the ventilation duct 1.

[0052] When the out-pipe communication controller 22 works, the rotating motor 223 drives the rotating shaft 222 to rotate. The rotation of the rotating shaft 222 causes the connecting baffle 221 to rotate outside the ventilation duct 1. The connecting baffle 221 can cover the first ventilation port 111 or the second ventilation port 121 under the action of the rotating motor 223, thereby controlling the communication state of the first ventilation port 111 or the second ventilation port 121.

[0053] With reference to Figure 1 , the input duct 11 is connected to the delivery fan 31 outside the greenhouse. The side of the input duct 11 connected to the greenhouse wall is connected to the out-pipe communication controller 22 inside the greenhouse. The input duct 11 connected to the greenhouse wall is connected to the in-pipe communication controller 21 at the connection between the input duct 11 connected to the greenhouse wall and the input duct 11 connected to the greenhouse ground.

[0054] The pipe outside communication controller 22 covers the outer wall of the input pipe 11, and when the pipe inside communication controller 21 controls the input pipe 11 to be in communication, the air in the input pipe 11 flows out from the first air vent 111 of the section of the input pipe 11 located on the ground. The pipe outside communication controller 22 outside the output pipe 12 is separated from the wall of the output pipe 12, and when the pipe inside communication controller 21 blocks the output pipe 12, the air in the greenhouse flows into the output pipe 12 from the second air vent 121 of the section of the output pipe 12 located on the top of the greenhouse, and is finally discharged to the outside of the greenhouse.

[0055] The output pipe 12 is connected to the top of the greenhouse, and the section of the output pipe 12 connected to the top of the greenhouse is connected to the pipe outside communication controller 22 on the side facing the inside of the greenhouse. The connection between the first section of the output pipe 12 connected to the top of the greenhouse and the section connected to the side wall of the greenhouse is connected to the pipe inside communication controller 21.

[0056] The pipe outside communication controller 22 outside the output pipe 12 is separated from the output pipe 12, and when the pipe inside communication controller 21 blocks the output pipe 12, the air in the greenhouse flows into the output pipe 12 from the second air vent 121 of the section of the output pipe 12 located on the top of the greenhouse, and is finally discharged to the outside of the greenhouse. When the pipe outside communication controller 22 outside the output pipe 12 covers the outer wall of the output pipe 12, the pipe inside communication controller 21 controls the section of the output pipe 12 connected to the top of the greenhouse and the section connected to the side wall of the greenhouse to be in communication, and the air in the greenhouse flows into the output pipe 12 from the second air vent 121 on the section of the output pipe 12 connected to the side wall of the greenhouse, and is finally discharged to the outside of the greenhouse.

[0057] The implementation principle of the greenhouse ventilation system according to an embodiment of the present application is as follows: when the temperature in the greenhouse is relatively high, the ventilation control mechanism 2 controls the first air vent 111 of the section of the input pipe 11 connected to the ground of the greenhouse to be opened, and the second air vent 121 of the output pipe 12 on the top of the greenhouse to be opened. Under the control of the air supply mechanism 3, the outside air is input into the greenhouse, and the air in the greenhouse is discharged through the output pipe 12 on the top of the greenhouse, so that the temperature in the greenhouse can be reduced more quickly. At the same time, the air flowing from bottom to top can enhance the transpiration of plants, further improve the speed of temperature reduction in the greenhouse, and reduce the energy consumption for temperature reduction in the process of greenhouse ventilation. When the temperature in the greenhouse and the temperature outside the greenhouse are both suitable for the growth of plants, the ventilation control system controls the air input into the greenhouse to flow from the first air vent 111 on one side of the greenhouse to the second air vent 121 on the other side of the greenhouse, thereby reducing the energy consumption for inputting air into the bottom end of the greenhouse. Finally, the energy consumption in the process of greenhouse ventilation is reduced.

[0058] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A greenhouse ventilation system, characterized in that The application relates to a ventilation pipeline (1) and a ventilation control mechanism (2) and a ventilation sending mechanism (3). The ventilation pipeline (1) comprises an input pipeline (11) and an output pipeline (12), one section of the input pipeline (11) is embedded in the ground of a greenhouse, another section of the input pipeline (11) is located on the side wall of the greenhouse, a plurality of first ventilation openings (111) are formed in the wall of the input pipeline (11), one section of the output pipeline (12) is arranged at the top end of the greenhouse, another section of the output pipeline (12) is located on the side wall of the greenhouse, and a plurality of second ventilation openings (121) are formed in the wall of the output pipeline (12). The ventilation control mechanism (2) is connected to the outer wall of the input pipeline (11) and the outer wall of the output pipeline (12) and is used for controlling the communication state of the first ventilation openings (111) and the second ventilation openings (121). The ventilation sending mechanism (3) is connected to the ventilation pipeline (1) and is used for controlling the air flow in the ventilation pipeline (1).

2. A greenhouse ventilation system according to claim 1, characterized in that: The ventilation control mechanism (2) comprises an in-pipeline communication controller (21) and an out-pipeline communication controller (22), the side wall of the ventilation pipeline (1) is provided with a control groove (13), the in-pipeline communication controller (21) is slidably arranged in the control groove (13), the out-pipeline communication controller (22) is connected to one end of the in-pipeline communication controller (21) located outside the ventilation pipeline (1), and the out-pipeline communication controller (22) is used for covering the first ventilation openings (111) and / or the second ventilation openings (121).

3. A greenhouse ventilation system according to claim 2, characterised in that: The in-pipeline communication controller (21) comprises a driving motor (211), a blocking sheet (212) and a leakage-proof cover (213), the driving motor (211) is connected to the outer wall of the ventilation pipeline (1), the blocking sheet (212) is fixedly connected to the output shaft of the driving motor (211), the side wall of the blocking sheet (212) slidably abuts against the groove wall of the control groove (13), the leakage-proof cover (213) covers the blocking sheet (212) and the driving motor (211), and one end of the leakage-proof cover (213) close to the ventilation pipeline (1) is sealingly abutted against the side wall of the ventilation pipeline (1).

4. A greenhouse ventilation system according to claim 3, characterised in that: The out-pipeline communication controller (22) comprises a connecting baffle (221), the connecting baffle (221) is used for covering the first ventilation openings (111) and / or the second ventilation openings (121), one side of the connecting baffle (221) is connected with a rotating shaft (222), one end of the rotating shaft (222) is connected with a rotating motor (223), and the rotating motor (223) is electrically connected with the driving motor (211).

5. A greenhouse ventilation system according to claim 2, characterized in that: The ventilation sending mechanism (3) is connected to the section of the input pipeline (11) connected with the side wall of the greenhouse, the in-pipeline communication controller (21) is arranged between the section of the input pipeline (11) connected with the side wall of the greenhouse and the section of the input pipeline (11) connected with the ground of the greenhouse, and the out-pipeline communication controller (22) is used for covering the first ventilation openings (111) on the section of the input pipeline (11) connected with the side wall of the greenhouse.

6. A greenhouse ventilation system according to claim 2, characterized in that: The pipe inner communication controller (21) is located between the end of the output pipe (12) connecting the greenhouse top and the end of the output pipe (12) connecting the greenhouse side wall, the pipe outer communication controller (22) is used for covering the second air vent (121) on the section of the output pipe (12) connecting the greenhouse top, and the section of the output pipe (12) connecting the greenhouse top communicates with the outside.

7. A greenhouse ventilation system according to claim 4, characterized in that: The connecting baffle (221) is connected with a sealing ring (224) on one side of the ventilation pipe (1), and the sealing ring (224) is arranged around the first air vent (111) or the second air vent (121) covered by the connecting baffle (221).

8. A greenhouse ventilation system according to claim 1, characterized in that: The air supply mechanism (3) comprises a conveying fan (31) and a humidifier (32), the conveying fan (31) is connected with the input pipe (11), and the humidifier (32) is located on one side of the conveying fan (31) facing the input pipe (11).

9. A greenhouse ventilation system according to claim 8, characterised in that: The humidifier (32) comprises a water conveying pipe (321) and a water permeable paperboard (322), one end of the water conveying pipe (321) abuts against the water permeable paperboard (322), and the water permeable paperboard (322) is arranged in the input pipe (11).

10. A greenhouse ventilation system according to claim 9, characterized in that: The bottom end of the water permeable paperboard (322) is connected with a leakage prevention clamping block (323), the leakage prevention clamping block (323) is provided with a leakage prevention clamping groove (3231) and a connecting hole (3232), a section of the water permeable paperboard (322) is inserted into the leakage prevention clamping groove (3231), one side of the water conveying pipe (321) abuts against the water permeable paperboard (322) through the connecting hole (3232), and the other side of the connecting hole (3232) and the water conveying pipe (321) jointly clamp the bottom end of the water permeable paperboard (322).

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