Environmental temperature regulation and control system for test crops in greenhouse

Abstract

The invention discloses an in-greenhouse test crop environment temperature regulation and control system, and relates to the technical field of farmland test, and the technical scheme is characterized in that the system comprises a water pipe rack arranged in a greenhouse, the water pipe rack is partially arranged on the ground, and the water pipe rack is partially arranged underground; the beam pipe is arranged on the outer side of the water passing pipe frame in a sleeving manner; the water pipe rack is communicated to a water flow reversing mechanism, the water flow reversing mechanism is communicated with a heater, and the heater is communicated to a water storage tank; one end of the beam pipe is communicated with an induced draft fan, the air inlet side of the induced draft fan is communicated with an airflow reversing mechanism, and a one-way air valve is arranged on the greenhouse. A temperature control mechanism is further included. The water pipe racks are arranged in the greenhouse and under the ground, the temperature in the greenhouse is controlled through circulating flow of water flow, and the temperature in the greenhouse is controlled by controlling different flowing directions of the water flow in a high-temperature environment and a low-temperature environment, arranging beam pipes on the outer sides of the water pipe racks in a sleeving manner and cooperating with an induced draft fan and an airflow reversing mechanism. Therefore, energy conservation is maximized while the temperature in the greenhouse is efficiently controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of farmland experiments, and specifically relates to an environmental temperature control system for experimental crops in a shed. Background Art

[0002] The experimental greenhouse is a core facility in modern agricultural scientific research and production. Its essence is to simulate or optimize crop growth conditions by artificially constructing a controllable environment for variety breeding, cultivation technology verification, environmental physiology research, etc. Since the greenhouse is a relatively sealed environment, based on the accuracy requirements of greenhouse research, it is necessary to ensure that the crops are maintained at an appropriate temperature to form a stable control group with the crops outside, so as to facilitate agricultural research. Since the greenhouse is relatively sealed, its internal temperature is always higher than the outside, and thus the crops are easily subjected to high-temperature stress. In a high-temperature environment, the traditional cooling method only uses a fan for ventilation, with poor heat exchange effect and can only reduce the temperature to the same as the outside. In a low-temperature environment, there is no additional heating method to maintain the appropriate temperature of the crops, and it cannot keep the crops within an appropriate temperature range, thus unable to meet the precise control requirements of temperature test variables.

[0003] In view of this, the present invention is designed to solve the above problems.

[0004] The above content is only used to assist in understanding the technical solution of the present invention and does not represent an admission that the above content is the closest prior art. Summary of the Invention

[0005] The object of the present invention is to solve the above deficiencies and provide an environmental temperature control system for experimental crops in a shed.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The environmental temperature control system for experimental crops in a shed includes a water pipe rack disposed in the greenhouse and evenly distributed among the crops along the long side direction of the greenhouse, wherein part of the water pipe rack is disposed on the ground and part is disposed underground; it also includes a beam tube sleeved outside the water pipe rack and having multiple groups of air holes opened at the upper end, and an air flow channel is formed between the beam tube and the water pipe rack;

[0008] Both ends of the water pipe rack are commonly connected to a water flow reversing mechanism for controlling the water inflow direction, a heater is connected to the water flow reversing mechanism, the heater is connected to a water storage tank provided with a water pump inside, and the water storage tank is connected to the water flow reversing mechanism;

[0009] One end of the beam tube is closed, and the other end is connected to an induced draft fan disposed outside the greenhouse. The air inlet side of the induced draft fan is connected to an air flow reversing mechanism communicating the inside and outside of the greenhouse, and a one-way air valve for exhausting to the outside is also provided on the greenhouse;

[0010] It also includes a temperature control mechanism that is signal - connected to the heater, water flow reversing mechanism, induced draft fan, and air flow reversing mechanism, enabling the following operating states when the system is working:

[0011] When the temperature in the greenhouse is too high, the water flow reversing mechanism controls the water flow to circulate in the order of "ground - underground", and at the same time, the induced draft fan cooperates with the air flow reversing mechanism to introduce air from the outside to ventilate the greenhouse;

[0012] When the temperature in the greenhouse is too low, the heater starts to heat, the water flow reversing mechanism controls the water flow to circulate in the order of "underground - ground", and at the same time, the induced draft fan cooperates with the air flow reversing mechanism to suck air from the greenhouse to form an internal air circulation.

[0013] Furthermore, both ends of the water pipe rack are connected to the upward water pipe and the downward water pipe through the main flow pipe. The water flow reversing mechanism includes a first confluence box that is commonly connected to the upward water pipe and the downward water pipe, a one - way water valve arranged in the first confluence box, two groups of maintaining springs arranged between both sides of the one - way water valve and the inner wall of the first confluence box, and a first driving component that drives the one - way water valve to move and is signal - connected to the temperature control mechanism; the first confluence box is connected to the water storage tank through a return pipe, the inlet of the one - way water valve faces the side of the upward water pipe and the downward water pipe, and its outlet is connected to the return pipe through a corrugated hose; in the standby state of the system, the inlet of the one - way water valve is located between the upward water pipe and the downward water pipe, and the outer surface of the one - way water valve closes the ports of the upward water pipe and the downward water pipe by abutting; when the temperature in the greenhouse is too high, the driving component drives the one - way water valve to move downward, making its inlet communicate with the downward water pipe and opening the port of the upward water pipe; when the temperature in the greenhouse is too low, the driving component drives the one - way water valve to move upward, making its inlet communicate with the upward water pipe and opening the port of the downward water pipe.

[0014] Furthermore, a first limit sliding groove is provided on the side wall of the first confluence box. The first driving component includes a first driving motor arranged outside the first confluence box, a first threaded lead screw installed on the first driving motor, a water - sealing plate arranged on the one - way water valve and clamped and sliding in the first limit sliding groove, and a first sleeve plate arranged on the water - sealing plate and threadedly sleeved with the first threaded lead screw.

[0015] Furthermore, the air flow reversing mechanism includes an air inlet box connected to the induced draft fan, an external air inlet pipe arranged on one side of the air inlet box and communicating with the outside, an internal air inlet pipe arranged on the other side of the air inlet box and communicating with the inside of the greenhouse, a closing block that is slidably limited in the air inlet box and used for alternately opening and closing the external air inlet pipe and the internal air inlet pipe, and a second driving component that drives the closing block to move.

[0016] Further, the second driving assembly includes a mounting frame disposed outside the air inlet box, a second driving motor disposed on the mounting frame, a second threaded lead screw mounted on the second driving motor, and a second sleeve plate connected to the opening and closing block and threadedly sleeved on the second threaded lead screw; a second limiting chute for limiting the sliding of the second sleeve plate is formed on the air inlet box.

[0017] Further, the temperature control mechanism includes a master control box disposed at the lower end of the heater and a temperature feedback assembly disposed on the master control box; the temperature feedback assembly includes a temperature sensing unit, a mounting plate disposed on the temperature sensing unit, and a thermal trigger switch and a cold trigger switch disposed on the mounting plate. When the thermal trigger switch is pressed and triggered, the first driving assembly drives the one-way water valve to move downward. When the cold trigger switch is pressed and triggered, the first driving assembly drives the one-way water valve to move upward.

[0018] Further, the temperature sensing unit includes a piston box for containing a working fluid. A hot working fluid chamber and a cold working fluid chamber are respectively disposed in the piston box. A first piston plate that seals and slides is disposed in the piston box. A piston rod that is movably inserted through the side wall of the piston box and is used to trigger the thermal trigger switch is disposed on the first piston plate; a second piston plate that seals and slides is disposed in the cold working fluid chamber. A first rack plate that is movably inserted through the side wall of the piston box is disposed on the second piston plate. A second rack plate that can be limited to move up and down and is used to trigger the cold trigger switch is movably inserted through the piston box. A transmission gear that meshes with the first rack plate and the second rack plate respectively is rotatably disposed on the piston box.

[0019] Further, a secondary control box is further disposed on the piston box. A touch switch is disposed on the secondary control box. A pressing plate for triggering the touch switch is disposed on the back side of the first rack plate; when the touch switch is in the pressed state, the second driving assembly drives the opening and closing block to close the external air duct and open the internal air duct, and at the same time, the heater starts to heat; when the touch switch is in the rebounding state, the second driving assembly drives the opening and closing block to close the internal air duct and open the external air duct; a pressing plate that communicates with the outside and the hot working fluid chamber and the cold working fluid chamber is further embedded on the side wall of the piston box.

[0020] Further, a flow control assembly for controlling the water flow rate is further disposed between the heater and the water flow reversing mechanism; the flow control assembly includes a second manifold box communicated with the heater and the first manifold box and a flow control valve plate that seals and slides in the second manifold box and is used to control the size of the water flow through section; the flow control valve plate is connected to the mounting plate through a connecting frame, and a return spring is disposed between the mounting plate and the outer surface of the second manifold box.

[0021] Further, the water pipes are evenly distributed in multiple layers at intervals in the longitudinal direction along the height of the crops on the ground, and the corresponding number of induced draft fans and air flow reversing mechanisms are provided according to the number of layers of the water pipes on the ground;

[0022] The water pipes in the underground part spread out horizontally to both sides, making its area larger than the crop planting area.

[0023] Compared with the prior art, the beneficial effects of this solution are as follows: By arranging water pipe racks inside and underground in the greenhouse, the present invention controls the temperature inside the greenhouse through the circulating flow of water, and by controlling the different flow directions of water in high-temperature and low-temperature environments. At the same time, a flow control pipe is sleeved outside the water pipe rack, and in cooperation with an induced draft fan and an air flow reversing mechanism, the energy conservation is maximized while efficiently controlling the temperature inside the greenhouse. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0025] Figure 1 is the front three-dimensional schematic view of the embodiment of the present invention;

[0026] Figure 2 is the rear three-dimensional schematic view of the embodiment of the present invention;

[0027] Figure 3 is the side three-dimensional schematic view of the embodiment of the present invention;

[0028] Figure 4 is the disassembled schematic view of the water pipe rack and the flow control pipe in the embodiment of the present invention;

[0029] Figure 5 is the combined front view schematic view of the water storage tank, the water flow reversing mechanism, and the temperature control mechanism in the embodiment of the present invention;

[0030] Figure 6 is the combined rear view schematic view of the water storage tank, the water flow reversing mechanism, and the temperature control mechanism in the embodiment of the present invention;

[0031] Figure 7 is the combined schematic view of the water flow reversing mechanism and the temperature control mechanism in the embodiment of the present invention;

[0032] Figure 8 is the disassembled schematic view of the first driving component and the first confluence box in the embodiment of the present invention;

[0033] Figure 9 is the internal structure schematic view of the first confluence box in the embodiment of the present invention;

[0034] Figure 10 is the schematic view of the positional relationship between the one-way water valve, the upward water pipe, and the downward water pipe in the initial state in the embodiment of the present invention;

[0035] Figure 11It is a sectional three-dimensional schematic diagram of the flow control component in the embodiment of the present invention;

[0036] Figure 12 It is a bottom view schematic diagram of the flow control component in the embodiment of the present invention;

[0037] Figure 13 It is a sectional three-dimensional schematic diagram of the piston box in the embodiment of the present invention;

[0038] Figure 14 It is a structural schematic diagram of the touch switch and the pressing plate in the embodiment of the present invention;

[0039] Figure 15 It is a schematic diagram of the relative relationship between the air flow reversing mechanism and the beam tube in the embodiment of the present invention;

[0040] Figure 16 It is a combined schematic diagram of the induced draft fan and the air flow reversing mechanism in the embodiment of the present invention;

[0041] Figure 17 It is a schematic diagram of the internal structure of the air inlet box in the embodiment of the present invention;

[0042] Figure 18 It is a structural schematic diagram of the second driving component in the embodiment of the present invention.

[0043] In the figure: 1. Water pipe support; 11. Air hole; 12. Beam tube; 13. Heater; 14. Water storage tank; 15. Induced draft fan; 2. Main flow tube; 21. Upward water pipe; 22. Downward water pipe; 23. First confluence box; 24. Check valve; 25. Sustaining spring; 26. Return pipe; 27. Corrugated hose; 28. First limit sliding groove; 3. First driving motor; 31. First threaded lead screw; 32. Water sealing plate; 33. First sleeve plate; 4. Air inlet box; 41. Outer air inlet pipe; 42. Inner air inlet pipe; 43. Opening and closing block; 44. Second limit sliding groove; 5. Mounting rack; 51. Second driving motor; 52. Second threaded lead screw; 53. Second sleeve plate; 6. Main control box; 61. Mounting plate; 62. Thermal trigger switch; 63. Cold trigger switch; 7. Piston box; 71. Thermal working fluid cavity; 72. Cold working fluid cavity; 73. First piston plate; 74. Piston rod; 75. Second piston plate; 76. First rack plate; 77. Second rack plate; 78. Transmission gear; 8. Sub-control box; 81. Touch switch; 82. Pressing plate; 9. Second confluence box; 91. Flow control valve plate; 92. Connecting frame; 93. Return spring. Detailed implementation manners

[0044] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0045] As Figure 1-18 shown in the in-shed test crop environmental temperature control system, which includes a water pipe rack 1 arranged in the greenhouse and evenly distributed among the crops along the long side direction of the greenhouse, wherein part of the water pipe rack 1 is arranged on the ground and part is arranged underground; it also includes a beam tube 12 sleeved outside the water pipe rack 1 and having multiple groups of air holes 11 opened at the upper end, wherein an air flow channel is formed between the beam tube 12 and the water pipe rack 1, so that when water flows into the water pipe rack 1, the air in the greenhouse is sucked into the air flow channel through the air holes 11 on the beam tube 12, thereby accelerating the heat exchange between the air and the water flow and improving the temperature control efficiency;

[0046] Both ends of the water pipe support 1 are jointly connected to a water flow reversing mechanism for controlling the inflow direction of water. A heater 13 is connected to the water flow reversing mechanism. The heater 13 is connected to a water storage tank 14 with a water pump inside. The outer wall of the water storage tank 14 is provided with a heat insulation layer. The water storage tank 14 is connected to the water flow reversing mechanism. One end of the beam tube 12 is closed, and the other end is connected to an induced draft fan 15 arranged outside the greenhouse. The air inlet side of the induced draft fan 15 is connected to an air flow reversing mechanism that communicates with both inside and outside the greenhouse. A one-way air valve for exhausting to the outside is also provided on the greenhouse. It also includes a temperature control mechanism that is signal-connected to the heater 13, the water flow reversing mechanism, the induced draft fan 15, and the air flow reversing mechanism. When the system works, it can be divided into a high-temperature regulation mode and a low-temperature regulation mode. In the high-temperature regulation mode, the greenhouse is in a high-temperature environment, and the crops are under high-temperature stress. At this time, the temperature control mechanism controls the water flow reversing mechanism to work, so that cold water enters the water pipe support 1 on the ground surface and flows underground. At this time, the air flow reversing mechanism controls the introduction of air from the outside. Since the temperature inside the greenhouse is always relatively high compared to the outside, the internal air is discharged through the one-way air valve by introducing outside air, thereby assisting in cooling the greenhouse. At the same time, the water flow exchanges heat with the air introduced from the outside, so that the heat is absorbed by the cold water. Since the soil is always in the low-temperature environment required by the crops, the heat is introduced underground, which not only realizes the decrease in the surface temperature but also ensures the increase in the underground temperature, reasonably utilizing the heat in the greenhouse. When in the low-temperature regulation mode, the greenhouse is in a low-temperature environment. To maintain the crops at the required test temperature, the heater 13 is started to heat the water body at this time. The temperature control mechanism controls the water flow reversing mechanism to work, so that the heated water flow enters the water pipe support 1 under the ground surface and flows upward to the ground surface. Since the specific heat capacity of the soil is greater than that of the air, it requires more heat to warm up. Therefore, the water flow is preferentially introduced underground to ensure a certain degree of soil temperature. Then, the waste heat of the water flow is used to warm up the air on the ground to reasonably utilize the heat. At the same time, during this process, the air flow reversing mechanism switches to the internal circulation mode, so that the induced draft fan 15 sucks the air inside the greenhouse and returns it into the greenhouse. While sucking, the air inside the greenhouse enters the air flow channel through the air holes 11 on the beam tube 12, and then exchanges heat with the water flow, improving the heat exchange efficiency and accelerating the temperature increase inside the greenhouse.

[0047] In one embodiment, both ends of the water pipe support 1 are connected to the upward water pipe 21 and the downward water pipe 22 through the main flow pipe 2. The water flow reversing mechanism includes a first confluence box 23 that is commonly connected to the upward water pipe 21 and the downward water pipe 22, a one-way water valve 24 arranged in the first confluence box 23, two groups of maintaining springs 25 arranged between both sides of the one-way water valve 24 and the inner wall of the first confluence box 23, and a first driving component that drives the one-way water valve 24 to move and is signal-connected to the temperature control mechanism; the first confluence box 23 is connected to the water storage tank 14 through the return pipe 26. The inlet of the one-way water valve 24 faces the side of the upward water pipe 21 and the downward water pipe 22, and its outlet is connected to the return pipe 26 through the corrugated hose 27; in the standby state of the system, the inlet of the one-way water valve 24 is located between the upward water pipe 21 and the downward water pipe 22, and the outer surface of the one-way water valve 24 abuts and closes the ports of the upward water pipe 21 and the downward water pipe 22; a first limit sliding groove 28 is formed on the side wall of the first confluence box 23. The first driving component includes a first driving motor 3 arranged outside the first confluence box 23, a first threaded lead screw 31 installed on the first driving motor 3, a water sealing plate 32 arranged on the one-way water valve 24 and clamped and slidably limited in the first limit sliding groove 28, and a first sleeve plate 33 arranged on the water sealing plate 32 and threadedly sleeved with the first threaded lead screw 31. The water sealing plate 32 is used to seal the first limit sliding groove 28 to prevent water loss. When the temperature in the greenhouse is too high, the first driving motor 3 drives the first threaded lead screw 31 to rotate, thereby driving the water sealing plate 32 to move downward, so that the one-way water valve 24 also moves downward, and thus its inlet is connected to the downward water pipe 22, and at the same time, the connection port between the upward water pipe 21 and the first confluence box 23 is opened. At this time, the cold water entering the first confluence box 23 will enter the water pipe support 1 on the ground surface through the upward water pipe 21 and flow downward to the ground, then enter the one-way water valve 24 through the downward water pipe 22, and enter the corrugated hose 27 from its outlet, and then return to the water storage tank 14 through the return pipe 26 to complete the water body circulation. When the temperature in the greenhouse is too low, the first driving motor 3 drives the first threaded lead screw 31 to drive the one-way water valve 24 to move upward, then the reverse circulation effect of the water flow is realized.

[0048] In one embodiment, the air flow reversing mechanism includes an air inlet box 4 communicated with the induced draft fan 15, an external air induction pipe 41 arranged on one side of the air inlet box 4 and communicated with the outside, an internal air induction pipe 42 arranged on the other side of the air inlet box 4 and communicated with the inside of the greenhouse, a closing block 43 which is limited and slides in the air inlet box 4, and a second driving component for driving the closing block 43 to move. The second driving component includes a mounting bracket 5 arranged on the outside of the air inlet box 4, a second driving motor 51 arranged on the mounting bracket 5, a second threaded lead screw 52 mounted on the second driving motor 51, and a second sleeve plate 53 which is connected with the closing block 43 and is threadedly sleeved on the second threaded lead screw 52. A second limiting chute 44 for limiting the sliding of the second sleeve plate 53 is formed on the air inlet box 4. In a high-temperature environment inside the greenhouse, the temperature control mechanism controls the second driving motor 51 to start, so that it drives the second threaded lead screw 52 to rotate, and then drives the second sleeve plate 53 to move, so that the closing block 43 inside the water pipe support 1 can move reciprocally, and then alternately controls the opening and closing of the external air induction pipe 41 and the internal air induction pipe 42.

[0049] In one embodiment, the temperature control mechanism includes a master control box 6 provided at the lower end of the heater 13 and a temperature feedback component provided on the master control box 6; the temperature feedback component includes a temperature sensing unit, a mounting plate 61 provided on the temperature sensing unit, and a thermal trigger switch 62 and a cold trigger switch 63 provided on the mounting plate 61. When the thermal trigger switch 62 is pressed and triggered, the first driving component drives the one-way water valve 24 to move downward. When the cold trigger switch 63 is pressed and triggered, the first driving component drives the one-way water valve 24 to move upward. The temperature sensing unit includes a piston box 7 for accommodating a working fluid. A hot working fluid chamber 71 and a cold working fluid chamber 72 are respectively provided in the piston box 7. A first piston plate 73 that seals and slides is provided in the piston box 7. A piston rod 74 that penetrates through the side wall of the piston box 7 and is used to trigger the thermal trigger switch 62 is provided on the first piston plate 73. A second piston plate 75 that seals and slides is provided in the cold working fluid chamber 72. A first rack plate 76 that penetrates through the side wall of the piston box 7 is provided on the second piston plate 75. A second rack plate 77 that can be limited to move up and down and is used to trigger the cold trigger switch 63 penetrates through the piston box 7. A transmission gear 78 that meshes with the first rack plate 76 and the second rack plate 77 respectively is rotatably provided on the piston box 7. A thermal expansion working fluid and a cold contraction working fluid are respectively filled in the hot working fluid chamber 71 and the cold working fluid chamber 72. The phase change temperatures of these two working fluids can be designed by mixing different materials. The specific temperature is set according to the required temperature range of the crops in the greenhouse. Here, an example is given. Assuming that the required temperature range of the crops is 30-40 degrees Celsius, the thermal expansion working fluid filled in the hot working fluid chamber 71 can be a paraffin-based composite material, which is mainly prepared by mixing materials such as n-tetracontane, expanded graphite, sodium dodecylbenzenesulfonate, and polyurethane elastomer in different proportion relationships, so that it starts to expand when the temperature reaches 40 degrees Celsius. The cold contraction working fluid filled in the cold working fluid chamber 72 can be a modified silicone oil system, which is mainly prepared by mixing phenylmethyl silicone oil, silicon carbide nanowires, perfluoroalkyl ether, and titanium dioxide aerogel, so that it shrinks when the greenhouse temperature is lower than 30 degrees. The specific expansion and contraction gradients can be adjusted by fine-tuning the amount of the filled working fluid and the material ratio. When the temperature in the greenhouse is too high, the working fluid in the hot working fluid chamber 71 expands due to heat, and then pushes the first piston plate 73 to move upward, so that the piston rod 74 presses against the thermal trigger switch 62, causing the one-way water valve 24 to move downward. When the temperature in the greenhouse is too low, the working fluid in the cold working fluid chamber 72 contracts due to cold, and then uses negative pressure to drive the second piston plate 75 to move downward. At this time, the first rack plate 76 moves downward synchronously, and is transmitted to the second rack plate 77 through the transmission gear 78, causing the second rack plate 77 to move upward, and then pressing against the cold trigger switch 63, causing the one-way water valve 24 to move upward, thereby controlling the circulation direction of the water flow in this way.

[0050] In one embodiment, a secondary control box 8 is further provided on the piston box 7. A touch switch 81 is provided on the secondary control box 8, and a pressing plate 82 for triggering the touch switch 81 is provided on the back side of the first rack plate 76. When the touch switch 81 is in the pressed state, the second driving assembly drives the opening and closing block 43 to close the external air duct 41 and open the internal air duct 42, and at the same time, the heater 13 starts heating. When the touch switch 81 is in the rebounding state, the second driving assembly drives the opening and closing block 43 to close the internal air duct 42 and open the external air duct 41. Then, when the greenhouse is in a low-temperature environment, the working fluid in the cold working fluid cavity 72 contracts at this time, and the first rack plate 76 moves downward, and presses the touch switch 81 through the pressing plate 82 on its back side, so that the second driving motor 51 is driven, thereby causing the opening and closing block 43 to close the external air duct 41, and then the internal air duct 42 is opened, thus starting the internal air circulation mode of the greenhouse. When the temperature in the greenhouse is too high, the first rack plate 76 does not move at this time, so the second driving motor 51 drives the opening and closing block 43 to open the external air duct 41 and close the internal air duct 42, so that air can be introduced from the outside for auxiliary cooling. A pressing plate 82 communicating with the outside and the thermal working fluid cavity 71 and the cold working fluid cavity 72 is further embedded on the side wall of the piston box 7, so that the temperature can be transferred to the working fluid faster.

[0051] In one embodiment, a flow control assembly for controlling the water flow rate is further included between the heater 13 and the water flow reversing mechanism. The flow control assembly includes a second manifold box 9 communicating with the heater 13 and the first manifold box 23, and a flow control valve plate 91 provided in the second manifold box 9 for sealing and sliding to control the cross-sectional area of the water flow passage. The flow control valve plate 91 is connected to the mounting plate 61 through a connecting frame 92, and a return spring 93 is provided between the mounting plate 61 and the outer surface of the second manifold box 9. When the temperature in the greenhouse is too high, the movement of the first piston plate 73 will preferentially press and trigger the trigger switch 62, so that the water flow enters the water pipe rack 1 on the ground, and at the same time drives the first piston plate 73 to continue to move upward, and then pushes the mounting plate 61, so that it drives the flow control valve plate 91 to move upward through the connecting frame 92. As the temperature continues to rise, the thermally expanded working fluid further expands, and then drives the mounting plate 61 to continue to move upward, so that the opening of the flow control valve plate 91 increases, thereby increasing the water flow rate to increase the cooling rate. On the contrary, when the temperature is too low, the first rack plate 76 will move downward, and transmit power to the second rack plate 77 through the transmission gear 78, so that it achieves the same movement effect as the piston rod 74, so that the opening of the flow control valve plate 91 increases as the temperature difference increases, so as to achieve efficient temperature maintenance.

[0052] In one embodiment, the water pipe racks 1 are evenly distributed in multiple layers along the longitudinal direction at the height of the crops on the ground. The number of the induced draft fans 15 and the air flow reversing mechanisms is set correspondingly according to the number of the water pipe racks 1 on the ground. Since there are gradient differences in the air temperature at different height positions, through this setting method, the air flow at different height layers is maintained to circulate horizontally or be horizontally introduced and replaced with the outside, minimizing the spatial exchange of air at different heights and improving the control efficiency of the temperature in the greenhouse. At the same time, the underground part of the water pipe racks 1 spreads to both sides in the horizontal direction, making its area larger than the crop planting area, thus ensuring a wider control area for the soil temperature and preventing the soil temperature at the planting area from changing too quickly, so as to extend the temperature maintenance time.

[0053] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

Claims

1. The environmental temperature control system for crops in the shed is characterized in that: It includes a water pipe rack (1) arranged in the greenhouse and evenly distributed among the crops along the long side direction of the greenhouse, where part of the water pipe rack (1) is set on the ground and part is set underground; It further includes a flow tube (12) sleeved outside the water pipe rack (1) and having multiple groups of air holes (11) opened at the upper end, and an air flow channel is formed between the flow tube (12) and the water pipe rack (1); Both ends of the water pipe rack (1) are jointly connected to a water flow reversing mechanism for controlling the water inflow direction, a heater (13) is connected to the water flow reversing mechanism, the heater (13) is connected to a water storage tank (14) with a water pump inside, and the water storage tank (14) is connected to the water flow reversing mechanism; One end of the flow tube (12) is closed, and the other end is connected to an induced draft fan (15) arranged outside the greenhouse. The air inlet side of the induced draft fan (15) is connected to an air flow reversing mechanism communicating the inside and outside of the greenhouse, and a one-way air valve for exhausting to the outside is also arranged on the greenhouse; It further includes a temperature control mechanism signal-connected to the heater (13), the water flow reversing mechanism, the induced draft fan (15), and the air flow reversing mechanism, so that the following operating states can be realized when the system works: When the temperature in the greenhouse is too high, the water flow reversing mechanism controls the water flow to circulate in the order of "ground - underground", and at the same time, the induced draft fan (15) cooperates with the air flow reversing mechanism to introduce air from the outside to ventilate the greenhouse; When the temperature in the greenhouse is too low, the heater (13) starts heating, the water flow reversing mechanism controls the water flow to circulate in the order of "underground - ground", and at the same time, the induced draft fan (15) cooperates with the air flow reversing mechanism to suck air from the greenhouse to form an internal air flow cycle.

2. The in-shed test crop environmental temperature regulation system according to claim 1, wherein: Both ends of the water pipe rack (1) are connected to an upward water pipe (21) and a downward water pipe (22) through a main flow pipe (2). The water flow reversing mechanism includes a first confluence box (23) jointly connected to the upward water pipe (21) and the downward water pipe (22), a one-way water valve (24) arranged in the first confluence box (23), two groups of maintaining springs (25) arranged between both sides of the one-way water valve (24) and the inner wall of the first confluence box (23), and a first driving component for driving the one-way water valve (24) to move and signal-connected to the temperature control mechanism; The first confluence box (23) is connected to the water storage tank (14) through a return pipe (26). The inlet of the one-way water valve (24) faces the side of the upward water pipe (21) and the downward water pipe (22), and its outlet is connected to the return pipe (26) through a corrugated hose (27); In the standby state of the system, the inlet of the one-way water valve (24) is located between the upward water pipe (21) and the downward water pipe (22), and the outer surface of the one-way water valve (24) closes the ports of the upward water pipe (21) and the downward water pipe (22) by abutting; When the temperature in the greenhouse is too high, the driving component drives the one-way water valve (24) to move downward, so that its inlet is connected to the downward water pipe (22), and the port of the upward water pipe (21) is opened; When the temperature in the greenhouse is too low, the driving component drives the one-way water valve (24) to move upward, so that its inlet is connected to the upward water pipe (21), and the port of the downward water pipe (22) is opened.

3. The in-shed test crop environment temperature regulation system according to claim 2, characterized in that: The side wall of the first busbar box (23) is provided with a first limit sliding groove (28). The first driving component includes a first driving motor (3) arranged outside the first busbar box (23), a first threaded lead screw (31) installed on the first driving motor (3), a water sealing plate (32) arranged on the one-way water valve (24) and clamped and slidably limited in the first limit sliding groove (28), and a first sleeve plate (33) arranged on the water sealing plate (32) and threadedly sleeved on the first threaded lead screw (31).

4. The environmental temperature control system for in-shed test crops according to claim 2, wherein: The air flow reversing mechanism includes an air inlet box (4) communicated with the induced draft fan (15), an external air guide pipe (41) arranged on one side of the air inlet box (4) and communicated with the outside, an internal air guide pipe (42) arranged on the other side of the air inlet box (4) and communicated with the inside of the greenhouse, a closing and opening block (43) slidably limited in the air inlet box (4) and used for alternately closing and opening the external air guide pipe (41) and the internal air guide pipe (42), and a second driving component for driving the closing and opening block (43) to move.

5. The in-shed test crop environment temperature regulation system according to claim 4, characterized in that: The second driving component includes a mounting bracket (5) arranged outside the air inlet box (4), a second driving motor (51) arranged on the mounting bracket (5), a second threaded lead screw (52) installed on the second driving motor (51), and a second sleeve plate (53) connected to the closing and opening block (43) and threadedly sleeved on the second threaded lead screw (52); The air inlet box (4) is provided with a second limit sliding groove (44) for the second sleeve plate (53) to slide and be limited.

6. The in-shed test crop environmental temperature regulation system according to claim 4, characterized in that: The temperature control mechanism includes a master control box (6) arranged at the lower end of the heater (13) and a temperature feedback component arranged on the master control box (6); The temperature feedback component includes a temperature sensing unit, a mounting plate (61) arranged on the temperature sensing unit, a thermal trigger switch (62) and a cold trigger switch (63) arranged on the mounting plate (61). When the thermal trigger switch (62) is pressed and triggered, the first driving component drives the one-way water valve (24) to move downward. When the cold trigger switch (63) is pressed and triggered, the first driving component drives the one-way water valve (24) to move upward.

7. The in-shed test crop environmental temperature regulation system according to claim 6, characterized in that: The temperature sensing unit includes a piston box (7) for containing a working medium. A hot working medium chamber (71) and a cold working medium chamber (72) are respectively arranged in the piston box (7). A first piston plate (73) is arranged in the piston box (7) to slide in a sealed manner. A piston rod (74) is arranged on the first piston plate (73) and movably penetrates through the side wall of the piston box (7) and is used for triggering the thermal trigger switch (62); A second piston plate (75) is arranged in the cold working medium chamber (72) to slide in a sealed manner. A first rack plate (76) is arranged on the second piston plate (75) and movably penetrates through the side wall of the piston box (7). A second rack plate (77) is movably penetrated through the piston box (7) and can be limited to move up and down and is used for triggering the cold trigger switch (63). A transmission gear (78) is also rotatably arranged on the piston box (7) and meshes with the first rack plate (76) and the second rack plate (77) respectively.

8. The in-shed test crop environmental temperature control system according to claim 7, characterized in that: A secondary control box (8) is further provided on the piston box (7). A touch switch (81) is provided on the secondary control box (8). A pressing plate (82) for triggering the touch switch (81) is provided on the back side of the first rack plate (76). When the touch switch (81) is in the pressed state, the second driving assembly drives the opening and closing block (43) to close the external air inlet pipe (41) and open the internal air inlet pipe (42). At the same time, the heater (13) starts heating. When the touch switch (81) is in the rebounding state, the second driving assembly drives the opening and closing block (43) to close the internal air inlet pipe (42) and open the external air inlet pipe (41). A pressing plate (82) communicating with the outside, the heat working fluid chamber (71), and the cold working fluid chamber (72) is further embedded on the side wall of the piston box (7).

9. The in-shed test crop environment temperature regulation system according to any one of claims 6-8, characterized in that: It further includes a flow control assembly provided between the heater (13) and the water flow reversing mechanism for controlling the water flow rate. The flow control assembly includes a second manifold box (9) communicating with the heater (13) and the first manifold box (23), and a flow control valve plate (91) provided in the second manifold box (9) for sealing and sliding to control the cross-sectional area of the water flow passage. The flow control valve plate (91) is connected to the mounting plate (61) through a connecting frame (92), and a return spring (93) is provided between the mounting plate (61) and the outer surface of the second manifold box (9).

10. The in-shed test crop environment temperature regulation system according to claim 9, wherein: The water pipe racks (1) on the ground are evenly distributed in multiple layers at intervals in the longitudinal direction along the height of the crops. The corresponding number of induced draft fans (15) and air flow reversing mechanisms are provided according to the number of layers of the water pipe racks (1) on the ground. The water pipe racks (1) in the underground part spread outwards in the horizontal direction so that its area is larger than the crop planting area.

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