A greenhouse superimposed cooling system

Abstract

The invention relates to the technical field of cooling systems, and proposes a greenhouse superimposed cooling system, the cooling effect of which is further optimized, the practicability is better, and the functions are further enriched, and the greenhouse superimposed cooling system can be functionally excavated, reducing the occupation of installation space of other equipment, so that the space utilization in the greenhouse is further optimized. The system comprises a greenhouse, a cold water storage tank and a fan-wet curtain water cooling system, the cold water storage tank is arranged outside the greenhouse, and the cold water storage tank is equipped with a refrigeration unit, a circulating water pump and a flash evaporator, a first layer of membrane is arranged under the inner top wall of the greenhouse, a second layer of membrane is arranged under the first layer of membrane, the fan-wet curtain water cooling system comprises a water curtain pipe and a fan, the water curtain pipe is arranged between the first layer of membrane and the second layer of membrane, the water curtain pipe is connected with a water suction pump, the water suction pump realizes the introduction of cold water in the cold water storage tank into the water curtain pipe, the fan is installed in the greenhouse, and the fan is located between the first layer of membrane and the second layer of membrane.

Description

Technical Field

[0001] The present invention relates to the technical field of cooling systems, and in particular to a greenhouse superimposed cooling system. Background Art

[0002] As we all know, a greenhouse is a facility that can transmit light and keep heat. It is used to cultivate plants in seasons that are not suitable for plant growth. It can create a climatic environment suitable for plant growth. By adjusting temperature, humidity, light, ventilation and other conditions, it can achieve off-season planting of crops, increase yield and quality, etc. A greenhouse superimposed cooling system is an auxiliary device for greenhouse environment control.

[0003] After searching, the Chinese patent publication number CN104296274A discloses an electronically controlled indoor water air conditioning system, which is roughly described as including a water pump A, a water tank cooling air device B and an electronic temperature control system C. The water suction pump A is connected to the water tank cooling air device B, and the electronic temperature control system C is connected to the water suction pump A and the water tank cooling air device B. The electronic temperature control system C can control the operation of the water suction pump A and the water tank cooling air device B according to the indoor temperature. When it is in use, the water suction pump A sucks water from the ground and sends the water to the water tank cooling air device B through a pipeline. Because the water tank cooling air device B is equipped with a fan, the fan can generate cold air by starting to blow toward the water tank. The electronic temperature control system C can control the operation of the water suction pump A and the water tank cooling air device B according to the indoor temperature. The water in the water tank cooling air device B is ventilated. The water is sent back to the ground through pipes. The Chinese patent announcement number CN1228579C discloses a combined cooling system for a multi-span greenhouse using a cooling membrane and a groundwater circulation pipeline. Under extremely hot climate conditions, the cooling combination device adopts a combination of an external sunshade, a cooling membrane, a groundwater circulation pipeline, a wet curtain, and a fan. When the relative humidity is not too high, the cooling of the wet curtain and fan system has obvious advantages, and its operating cost is relatively low and economical. As an important component of active cooling, when the outside temperature is close to 40°C and the temperature in the greenhouse has reached more than 50 or 60 degrees, it is sometimes difficult to meet the growth needs of vegetables and flowers by cooling with a wet curtain fan. The device is combined into the groundwater pipeline circulation pipeline to further reduce the temperature of the greenhouse and achieve effective cooling.

[0004] Although the above-mentioned existing technical solutions can be applied to greenhouses to achieve cooling inside the greenhouse, the greenhouse is a space for cultivating plants. Therefore, how to optimize space utilization while ensuring effective cooling and improve the functionality of the system are the keys to improving the value of the greenhouse superimposed cooling system. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a greenhouse superimposed cooling system, the cooling effect of which is further optimized, the practicability is better, and the functions are further enriched. It is possible to functionally explore the greenhouse superimposed cooling system, reduce the space occupied by other equipment installation space, and further optimize the space utilization in the greenhouse.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a greenhouse superimposed cooling system, comprising a greenhouse and a cold water storage tank, and also comprising a fan-wet curtain water cooling system, the cold water storage tank is arranged outside the greenhouse, and the cold water storage tank is equipped with a refrigeration unit, a circulating water pump and a flash evaporator, a first layer of membrane is arranged under the inner top wall of the greenhouse, and a second layer of membrane is arranged below the first layer of membrane, the fan-wet curtain water cooling system comprises a water curtain pipe and a fan, the water curtain pipe is arranged between the first layer of membrane and the second layer of membrane, the water curtain pipe is connected with a water suction pump, and the water suction pump realizes the introduction of cold water in the cold water storage tank into the water curtain pipe, the fan is installed in the greenhouse, and the fan is located between the first layer of membrane and the second layer of membrane, the fan is equipped with a positive pressure cold air system, a return pipeline is installed in the greenhouse, and the return pipeline is connected with the cold water storage tank, a soil layer is arranged in the greenhouse, a tillage layer water cooling system is arranged in the soil layer, and the tillage layer water cooling system is connected with the cold water storage tank.

[0007] Furthermore, the tillage layer water cooling system includes an inlet pipe and a return pipe, both of which are connected to the cold water storage tank, and a plurality of cold water conduits are connected between the inlet pipe and the return pipe. The plurality of cold water conduits are evenly buried in the soil layer, and a water supply pump is installed on the cold water storage tank, and the water supply pump is adapted to the inlet pipe and the return pipe.

[0008] Furthermore, a circular frame is fixedly connected to the cold water energy storage tank, a rotating chamber is arranged in the circular frame, the water inlet pipe and the return pipe are both connected to the rotating chamber, a rotating frame is rotatably connected in the rotating chamber, the water supply pump is installed on the rotating frame, a water inlet passage and a return water passage are arranged in the rotating frame, the water supply pump is connected and cooperated with the water inlet passage, and pressure irrigation components are installed in the plurality of cold water conduits.

[0009] Furthermore, the multiple pressure irrigation components each include a stabilizing spring and an inner movable tube, the multiple stabilizing springs are respectively fixedly connected in the multiple cold water conduits, the multiple inner movable tubes are respectively fixedly connected to the multiple stabilizing springs, the multiple inner movable tubes are respectively slidably connected in the multiple inner movable tubes, a one-way valve is installed at one end of the multiple inner movable tubes away from the multiple stabilizing springs, multiple overflow holes are opened on the multiple cold water conduits, multiple inner movable tubes are opened with multiple flow holes, and the multiple overflow holes are respectively matched with the multiple flow holes.

[0010] Furthermore, a lifting pipe is slidably connected in the return pipe, a linkage rod is fixedly connected to the outer wall of the lifting pipe, an eccentric ring is provided on the rotating frame, the eccentric ring is used to push the linkage rod, the linkage rod is fixedly connected to a limit spring, and the bottom end of the limit spring is fixedly connected to the top of the cold water storage tank.

[0011] Furthermore, the eccentric ring is provided with two limiting grooves, and both of the two limiting grooves match the linkage rod.

[0012] Furthermore, the positive-pressure cold air system includes an air inlet duct and a return air duct, the top end of the air inlet duct and the top end of the return air duct are both connected to the area between the first layer of membrane and the second layer of membrane, the bottom end of the air inlet duct and the bottom end of the return air duct are both connected to the area below the second layer of membrane in the greenhouse, and the fan is installed at the air inlet duct.

[0013] Furthermore, the water temperature in the cold water storage tank is kept constant between 10°C and 15°C.

[0014] Furthermore, an arch frame is provided in the greenhouse, and the arch frame is used for supporting and installing the second layer of membrane.

[0015] Furthermore, the reflux pipeline includes two collecting troughs and two curved pipes. The two collecting troughs are respectively arranged at the left and right ends of the arch frame. The top ends of the two curved pipes are respectively connected to the two collecting troughs, and the bottom ends of the two curved pipes are connected to the cold water storage tank.

[0016] Compared with the prior art, the present invention provides a greenhouse superimposed cooling system, which has the following beneficial effects:

[0017] (1) In the present invention, a cooling system with coordinated control of the upper, middle and lower parts is established in the greenhouse through the cooperation of the cold water storage tank, the fan-wet curtain water cooling system, the positive pressure cold air system and the tillage layer water cooling system. During the actual operation, the temperature of the greenhouse including the tillage soil layer is controlled to the most suitable temperature for the crops, so as to promote the improvement of both yield and quality.

[0018] (2) In the present invention, through the design of the water cooling system of the cultivated layer, the cold water in the cold water storage tank is laid under the cultivated soil layer by the cold water conduit in the soil layer, so that the cold water can be evenly distributed in the entire soil layer. The soil layer is cooled by the cooling heat absorption and heat exchange law of the soil layer itself, thereby ensuring a good root environment for the planted crops. In addition, through corresponding adjustments, the cold water conduit can also irrigate the planted crops, which is more functional and practical.

[0019] (3) In the present invention, the cold water in the cold water storage tank can be introduced into the water curtain pipe through the matching of the fan-wet curtain water cooling system, forming a water curtain between the first membrane and the second membrane, and the fan is used to make the air flow quickly to take away the heat. When the fast-flowing air passes through the water curtain, the water in the water curtain absorbs the heat in the air and evaporates, and the evaporation takes away a large amount of heat, so that the temperature of the air passing through the water curtain is reduced, thereby achieving the purpose of cooling. Generally, the cooling can reach 8℃-15℃, and the rapid cooling effect reaches 90%-97%. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a partially cutaway three-dimensional structure of the present invention;

[0021] Figure 2 Another partially cutaway three-dimensional structural schematic diagram of the present invention;

[0022] Figure 3 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0023] Figure 4 It is a partially cutaway three-dimensional structural schematic diagram of the cold water conduit, the stabilizing spring and the inner moving tube of the present invention;

[0024] Figure 5 It is a schematic diagram of the three-dimensional structure of the present invention as a whole from another angle;

[0025] Figure 6 For the present invention Figure 5 A schematic diagram of the local enlarged structure at point A in the middle;

[0026] Figure 7 It is a schematic diagram of the exploded three-dimensional structure of the cooperation of the circular ring frame, the rotating frame and the eccentric ring of the present invention.

[0027] In the figure: 1. Greenhouse; 2. Cold water storage tank; 3. Circulating water pump; 4. Flash evaporator; 5. First membrane layer; 6. Second membrane layer; 7. Water curtain pipe; 8. Fan; 9. Suction pump; 10. Soil layer; 11. Water inlet pipe; 12. Return pipe; 13. Cold water conduit; 14. Water supply pump; 15. Ring frame; 16. Rotating frame; 17. Water inlet passage; 18. Return passage; 19. Stabilizing spring; 20. Inner moving pipe; 21. One-way valve; 22. Overflow hole; 23. Flow hole; 24. Lifting pipe; 25. Linkage rod; 26. Eccentric ring; 27. Limit spring; 28. Limit groove; 29. ​​Air inlet pipe; 30. Return air pipe; 31. Arch frame; 32. Collecting tank; 33. Bend pipe. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-Figure 7 A greenhouse superimposed cooling system includes a greenhouse 1 and a cold water storage tank 2, and also includes a fan-wet curtain water cooling system. The cold water storage tank 2 is arranged outside the greenhouse 1, and the cold water storage tank 2 is equipped with a refrigeration unit, a circulating water pump 3 and a flash evaporator 4. The water temperature in the cold water storage tank 2 is constant between 10°C and 15°C through the circulation refrigeration of the refrigerant in the refrigeration unit. A first layer of membrane 5 is arranged under the inner top wall of the greenhouse 1, and a second layer of membrane 6 is arranged below the first layer of membrane 5. An arch frame 31 is arranged in the greenhouse 1, and the arch frame 31 is used for supporting and installing the second layer of membrane 6. The fan-wet curtain water cooling system includes a water curtain pipe 7 and a fan 8. The water curtain pipe 7 is arranged between the first layer of membrane 5 and the second layer of membrane 6. The water curtain pipe 7 is connected to a water suction pump 9. The water suction pump 9 realizes the introduction of cold water in the cold water storage tank 2 into the water curtain pipe 7. The fan 8 is installed in the greenhouse 1, and the fan 8 is located between the first layer of membrane 5 and the second layer of membrane 6. The fan 8 is equipped with a positive pressure cold air system, which includes an air inlet duct 29 and a return air duct 30. The top of the air inlet duct 29 and the top of the return air duct 30 are both connected to the area between the first layer of membrane 5 and the second layer of membrane 6, and the bottom of the air inlet duct 29 and the bottom of the return air duct 30 are both connected to the area below the second layer of membrane 6 in the greenhouse 1. The fan 8 is installed at the air inlet duct 29. Through the matching of the fan-wet curtain water cooling system, the cold water in the cold water energy storage tank 2 can be introduced into the water curtain pipe 7 to form a water curtain between the first layer of membrane 5 and the second layer of membrane 6, and the fan 8 is used to make the air flow quickly to take away the heat. When the fast-flowing air passes through the water curtain, the water in the water curtain will absorb the heat in the air and evaporate, and the evaporation takes away a large amount of heat, so that the temperature of the air passing through the water curtain is reduced, thereby achieving the purpose of cooling. Generally, the cooling can reach 8℃-15℃, and the rapid cooling effect reaches 90%-97%.

[0030] It should be further explained that a return pipeline is installed in the greenhouse 1, and the return pipeline is connected to the cold water storage tank 2. The return pipeline includes two collecting tanks 32 and two curved pipes 33. The two collecting tanks 32 are respectively arranged at the left and right ends of the arch frame 31, and the tops of the two curved pipes 33 are respectively connected to the two collecting tanks 32, and the bottoms of the two curved pipes 33 are connected to the cold water storage tank 2, so as to facilitate the return of cold water after the water curtain is formed to the cold water storage tank 2. A soil layer 10 is arranged in the greenhouse 1, and a tillage layer water cooling system is arranged in the soil layer 10. The tillage layer water cooling system is connected to the cold water storage tank 2. Through the cooperation of the fan-wet curtain water cooling system, the positive pressure cold air system and the tillage layer water cooling system, a three-in-one coordinated regulation of the upper, middle and lower parts is established in the greenhouse 1. The cooling system controls the temperature of the cultivated soil layer 10 in the greenhouse 1 to the most suitable temperature for the crops during actual operation, so as to promote the improvement of both the yield and quality of the crops. The cultivated layer water cooling system comprises an inlet pipe 11 and a return pipe 12. The inlet pipe 11 and the return pipe 12 are both connected to the cold water storage tank 2. A plurality of cold water conduits 13 are connected between the inlet pipe 11 and the return pipe 12. The plurality of cold water conduits 13 are evenly buried in the soil layer 10. A water supply pump 14 is installed on the cold water storage tank 2. The water supply pump 14 is adapted to the inlet pipe 11 and the return pipe 12. A circular frame 15 is fixedly connected to the cold water storage tank 2. A rotating chamber is arranged in the circular frame 15. The inlet pipe 11 and the return pipe 12 are both connected to the rotating chamber. A rotating frame 16 is rotatably connected in the rotating chamber. The water pump 14 is installed on the rotating frame 16. The rotating frame 16 is provided with a water inlet passage 17 and a water return passage 18. The water pump 14 is connected and cooperated with the water inlet passage 17. Pressure irrigation components are installed in multiple cold water pipes 13. Multiple pressure irrigation components include stabilizing springs 19 and inner moving tubes 20. Multiple stabilizing springs 19 are respectively fixedly connected in multiple cold water pipes 13. Multiple inner moving tubes 20 are respectively fixedly connected to multiple stabilizing springs 19. Multiple inner moving tubes 20 are respectively slidably connected in multiple inner moving tubes 20. One end of multiple inner moving tubes 20 away from multiple stabilizing springs 19 is respectively provided with a one-way valve 21. Multiple cold water pipes 13 are provided with multiple overflow holes 22. Multiple inner moving tubes 20 are provided with multiple flow holes 23. Multiple overflow holes 22 are matched with multiple flow holes 23 respectively, a lifting pipe 24 is slidably connected in the return pipe 12, a linkage rod 25 is fixedly connected to the outer wall of the lifting pipe 24, an eccentric ring 26 is arranged on the rotating frame 16, the eccentric ring 26 is used to push the linkage rod 25, the linkage rod 25 is fixedly connected to the limit spring 27, the bottom end of the limit spring 27 is fixedly connected to the top of the cold water storage tank 2, through the design of the tillage layer water cooling system, the cold water in the cold water storage tank 2 is laid under the tillage soil layer 10 by the cold water conduit 13 in the soil layer 10, so that the cold water can be evenly distributed throughout the soil layer 10, and the soil layer 10 is cooled by the cooling heat absorption and cold and heat exchange law of the soil layer 10 itself, thereby ensuring a good root environment for the planted crops, and through corresponding adjustments,The cold water conduit 13 can also irrigate the crops, which is more functional and practical. Two limit grooves 28 are provided on the eccentric ring 26. Both limit grooves 28 match the linkage rod 25. The linkage rod 25 is inserted into the corresponding limit groove 28 to achieve the rotation limit between the linkage rod 25 and the eccentric ring 26.

[0031] The refrigeration unit, circulating water pump 3, flash evaporator 4, water suction pump 9, fan 8, water supply pump 14 and one-way valve 21 in this embodiment are all conventional equipment purchased on the market and known to those skilled in the art. In the present invention, we only use them and do not improve their structure and function. For those skilled in the art, their setting method, installation method and electrical connection method only need to be debugged and operated according to the requirements of their instruction manual, and will not be described in detail here.

[0032] To sum up, the working principle of the greenhouse superimposed cooling system is as follows: when in use, first add cold water to the cold water storage tank 2, the cold water storage tank 2 is provided with an inlet, and the addition of cold water to the cold water storage tank 2 is achieved through the inlet, and the amount of cold water added is controlled. After the cold water is added, the bottom end of the water inlet pipe 11 needs to be immersed in the cold water, and after the lifting pipe 24 rises to the limit height relative to the return pipe 12, the bottom end of the return pipe 12 will not be immersed in the cold water. During actual operation, first start the refrigeration unit, the circulating water pump 3 and the flash evaporator 4 to control the cold water in the cold water storage tank 2 to be between 10°C and 15°C, and then start the suction pump 9, the fan 8 and the water delivery pump 14. The suction pump 9 works to transfer the cold water in the cold water storage tank 2 to the cooling water supply tank 11. The water is sucked into the water curtain tube 7, which includes a main pipe and multiple branch pipes. The multiple branch pipes are all provided with multiple water distribution holes. The cold water entering the water curtain tube 7 will be dispersed into the multiple branch pipes through the main pipe and finally discharged through the multiple water distribution holes. The cold water discharged from the water distribution holes realizes the formation of the water curtain. The fan 8 operates through the air inlet pipe 29 to suck the air in the space below the second layer of membrane 6 in the greenhouse 1 into the water curtain area. The air entering the water curtain area is discharged into the space below the second layer of membrane 6 in the greenhouse 1 again through the return air pipe 30 after passing through the water curtain area, thereby realizing the circulating refrigeration of the air in the greenhouse 1, and the air humidity can be effectively increased during the refrigeration process. Since the arch frame 31 is a gradient structure with high middle and low ends, a water curtain is formed. The cold water will flow into the collecting tank 32 under the acceptance and guidance of the second membrane 6. The cold water entering the collecting tank 32 is finally guided by the elbow 33 to form a reflux into the cold water storage tank 2. The water supply pump 14 works to realize the delivery of the cold water storage tank 2 into the cold water conduit 13, and is controlled by the flow of the one-way valve 21. When the water inlet passage 17 and the return water passage 18 are connected with the water inlet pipe 11 and the return water pipe 12 respectively, in this state, since the eccentric ring 26 has a small downward push amplitude on the linkage rod 25, the lifting pipe 24 forms a relative height rise relative to the return water pipe 12 under the action of the limit spring 27, so that the bottom end of the lifting pipe 24 is away from the water surface of the cold water in the cold water storage tank 2. At this time, the water supply pump 14 works, and the water supply pipe 18 is connected to the water inlet pipe 11 and the return water pipe 12. The cold water in the cold water storage tank 2 is sucked out through the water inlet pipe 11 and sent into multiple cold water conduits 13. In this state, the flow direction of the cold water in the inner moving pipe 20 is exactly the direction in which the one-way valve 21 allows the cold water to flow. Therefore, the cold water will flow into the inner moving pipe 20 through the one-way valve 21, and after flowing through the inner moving pipe 20, it is guided back to the return pipe 12 through the cold water conduit 13. Due to the elastic action of the stabilizing spring 19, the position of the inner moving pipe 20 in the cold water conduit 13 can be stably controlled, so that the multiple overflow holes 22 are respectively offset relative to the multiple flow holes 23, ensuring that the cold water flowing through the inner moving pipe 20 does not overflow through the cold water conduit 13. At this time, the cold water flowing through the inner moving pipe 20 can achieve cooling of the soil layer 10.

[0033] Furthermore, when it is necessary to form relative irrigation for the soil layer 10, first control the rotating frame 16 to rotate relative to the circular frame 15 so that the relative rotation angle of the two is one hundred and eighty degrees. After the rotation adjustment is completed, the water inlet passage 17 and the return water passage 18 are connected to the return water pipe 12 and the water inlet pipe 11 respectively. Due to the pushing action of the eccentric ring 26, the lifting pipe 24 will fall and be inserted below the cold water liquid level in the cold water storage tank 2. In this state, the water supply pump 14 works to suck the cold water in the cold water storage tank 2 into the return water pipe 12 through the lifting pipe 24. Since the flow direction of the cold water sent into the cold water conduit 13 through the return water pipe 12 has changed, the one-way valve 21 on the inner moving pipe 20 will not allow the cold water to pass. However, due to the continuous supply of cold water into the cold water conduit 13, the increase in the space demand of cold water in the cold water conduit 13 will push the inner movable tube 20 to overcome the pulling force of the stabilizing spring 19 and move, causing the multiple overflow holes 22 to be connected relative to the multiple flow holes 23 respectively. When the multiple overflow holes 22 are connected relative to the multiple flow holes 23 respectively, the cold water in the inner movable tube 20 will flow out to the soil layer 10, thereby irrigating the soil layer 10. Irrigation operations can be achieved on the basis of refrigeration, and the functions have been further enriched. The functional excavation of the greenhouse superimposed cooling system can be carried out, reducing the occupation of the installation space of other equipment, and further optimizing the space utilization in the greenhouse 1.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A greenhouse superimposed cooling system, comprising a greenhouse (1) and a cold water storage tank (2), characterized in that: The invention also comprises a fan-wet curtain water cooling system, wherein the cold water storage tank (2) is arranged outside the greenhouse (1), and the cold water storage tank (2) is equipped with a refrigeration unit, a circulating water pump (3) and a flash evaporator (4); a first layer of membrane (5) is arranged under the inner top wall of the greenhouse (1), and a second layer of membrane (6) is arranged below the first layer of membrane (5); the fan-wet curtain water cooling system comprises a water curtain pipe (7) and a fan (8); the water curtain pipe (7) is arranged between the first layer of membrane (5) and the second layer of membrane (6); the water curtain pipe (7) is connected to a water suction pump (9), and the water suction pump (9) enables the cold water in the cold water storage tank (2) to be introduced into the water curtain pipe (7); the fan (8) is installed in the greenhouse (1), and the fan (8) is located between the first layer of membrane (5) and the second layer of membrane (6); the fan (8) is equipped with a cooling fan (9); and the cooling fan (9) is installed in the greenhouse (1). The cooling fan (8) is located between the first layer of membrane (5) and the second layer of membrane (6); and the cooling fan (8) is equipped with a cooling fan (9); and the cooling fan (9 ... A positive pressure cold air system is provided, a return pipeline is installed in the greenhouse (1), the return pipeline is connected to the cold water storage tank (2), a soil layer (10) is provided in the greenhouse (1), a tillage layer water cooling system is provided in the soil layer (10), the tillage layer water cooling system is connected to the cold water storage tank (2), the tillage layer water cooling system comprises an inlet pipe (11) and a return pipe (12), the inlet pipe (11) and the return pipe (12) are both connected to the cold water storage tank (2), a plurality of cold water conduits (13) are connected between the inlet pipe (11) and the return pipe (12), the plurality of cold water conduits (13) are uniformly buried in the soil layer (10), a water supply pump (14) is installed on the cold water storage tank (2), the water supply pump (14) is adapted to the inlet pipe (11) and the return pipe (12); The cold water storage tank (2) is fixedly connected to a circular frame (15), a rotating chamber is provided in the circular frame (15), the water inlet pipe (11) and the water return pipe (12) are both in communication with the rotating chamber, a rotating frame (16) is rotatably connected in the rotating chamber, the water supply pump (14) is mounted on the rotating frame (16), a water inlet passage (17) and a water return passage (18) are provided in the rotating frame (16), the water supply pump (14) is in communication with the water inlet passage (17), a plurality of the cold water conduits (13) are each installed with a pressure irrigation assembly, and the plurality of the pressure irrigation assemblies each include a stabilizing spring (19) and an inner A movable tube (20), a plurality of the stabilizing springs (19) are respectively fixedly connected in the plurality of the cold water conduits (13), a plurality of inner movable tubes (20) are respectively fixedly connected to the plurality of stabilizing springs (19), a plurality of inner movable tubes (20) are respectively slidably connected in the plurality of inner movable tubes (20), a one-way valve (21) is installed at one end of the plurality of inner movable tubes (20) away from the plurality of stabilizing springs (19), a plurality of overflow holes (22) are respectively opened on the plurality of cold water conduits (13), a plurality of inner movable tubes (20) are respectively opened with a plurality of flow holes (23), and the plurality of overflow holes (22) are respectively matched with the plurality of flow holes (23); A lifting pipe (24) is slidably connected inside the return pipe (12), a linkage rod (25) is fixedly connected to the outer wall of the lifting pipe (24), an eccentric ring (26) is provided on the rotating frame (16), the eccentric ring (26) is used to push the linkage rod (25), the linkage rod (25) is fixedly connected to a limit spring (27), the bottom end of the limit spring (27) is fixedly connected to the top end of the cold water storage tank (2), and two limit grooves (28) are provided on the eccentric ring (26), and the two limit grooves (28) are matched with the linkage rod (25).

2. A greenhouse superimposed cooling system according to claim 1, characterized in that: The positive pressure cold air system comprises an air inlet duct (29) and an air return duct (30), the top end of the air inlet duct (29) and the top end of the air return duct (30) are both connected to the area between the first layer of membrane (5) and the second layer of membrane (6), the bottom end of the air inlet duct (29) and the bottom end of the air return duct (30) are both connected to the area below the second layer of membrane (6) in the greenhouse (1), and the fan (8) is installed at the air inlet duct (29).

3. A greenhouse superimposed cooling system according to claim 2, characterized in that: The water temperature in the cold water storage tank (2) is kept constant between 10°C and 15°C.

4. A greenhouse superimposed cooling system according to claim 3, characterized in that: An arch frame (31) is provided in the greenhouse (1), and the arch frame (31) is used for supporting and installing the second layer of membrane (6).

5. A greenhouse superimposed cooling system according to claim 4, characterized in that: The return pipeline comprises two collecting troughs (32) and two curved pipes (33); the two collecting troughs (32) are respectively arranged at the left and right ends of the arch frame (31); the top ends of the two curved pipes (33) are respectively connected to the two collecting troughs (32); and the bottom ends of the two curved pipes (33) are both connected to the cold water energy storage tank (2).

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