Pipe-buried type soil energy storage device and use method

Abstract

The invention provides a buried pipe type soil energy storage device and a use method, and belongs to the technical field of soil energy storage systems. The device comprises supporting legs, a liquid storage tank fixed to the supporting legs and a control box, a feeding opening is formed in the top of the liquid storage tank, a conveying pipeline is fixedly installed at the bottom of the liquid storage tank, a tap pipe is fixedly connected to one end of the conveying pipeline, and a pipe connector is fixed to one end of the tap pipe through a screw; a plurality of permeation pipes which are distributed in an array manner are fixedly mounted at the bottom of the tap pipe, and a plurality of permeation holes are formed in the peripheral surfaces of the permeation pipes; integrated induction strips are mounted on the peripheral surfaces of the permeation pipes, a liquid pump is fixedly mounted on the conveying pipeline, and the integrated induction strips and the liquid pump are electrically connected with the control box. According to monitoring and feedback results of soil, conveyed liquid can be switched, the compactness of the soil is guaranteed, the thermal conductivity, the pressure resistance and the crack resistance of the soil are improved, soil cracks are repaired, and the operation efficiency and the long-term stability of a soil source heat pump system are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of soil energy storage systems, and particularly relates to a buried pipe type soil energy storage device and a using method thereof. Background Art

[0002] The statements in this part merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] Currently, soil source heat pump systems are widely used to provide energy-saving heating, ventilation, and air conditioning solutions. This system conducts heat exchange through underground energy and exchanges heat with the underground soil through a buried pipe system. However, the thermal conductivity of the soil is relatively low, which limits the overall efficiency of the heat pump system. Traditional thermal insulation materials, such as foamed plastics and mineral wools, can improve the thermal conductivity of the soil to a certain extent, but these materials may degenerate and age during long-term use, thereby affecting the long-term stability and performance of the system.

[0004] In recent years, the technology of microbially induced calcium carbonate precipitation (MICP) has been proven to be an effective means to improve the thermal conductivity of the soil and enhance the soil stability. Through microbial action, calcium carbonate is deposited into the soil, which can not only significantly improve the thermal conductivity of the soil but also enhance the durability of the soil material through a self-healing mechanism. Therefore, applying the MICP technology to the soil source heat pump system as a new type of functional material has great application potential. Summary of the Invention

[0005] To overcome the deficiencies of the above-mentioned prior art, the present invention provides a buried pipe type soil energy storage device and a using method thereof, which can improve the thermal conductivity of the soil and avoid the degradation and aging problems caused by using traditional thermal insulation materials, thereby affecting the long-term stability and performance of the system.

[0006] To achieve the above object, one or more embodiments of the present invention provide the following technical solutions:

[0007] The first aspect of the present invention provides a buried pipe type soil energy storage device;

[0008] A buried pipe type soil energy storage device, comprising:

[0009] A buried pipe soil energy storage device, including feet (100), a liquid storage tank (1) and a control box (2) fixed on the feet (100). The top of the liquid storage tank (1) is provided with a feeding port (12). A conveying pipeline (5) is fixedly installed at the bottom of the liquid storage tank (1). One end of the conveying pipeline (5) is fixedly connected with a sub-pipe (7). One end of the sub-pipe (7) is fixed with a pipe joint (11) by screws. A plurality of infiltration pipes (8) distributed in an array are fixedly installed at the bottom of the sub-pipe (7). A plurality of infiltration holes (10) are formed on the outer peripheral surface of the infiltration pipe (8).

[0010] Integrated induction strips (9) are installed on the outer peripheral surfaces of several of the infiltration pipes (8). A liquid pump (6) is fixedly installed on the conveying pipeline (5). The integrated induction strips (9) and the liquid pump (6) are both electrically connected to the control box (2).

[0011] As a further technical solution, a temperature sensor, a humidity sensor, a soil detector and a data acquisition module are sequentially installed inside the integrated induction strip (9). A main control unit, an operation interface, a PLC controller and a data processing unit are sequentially installed on the control box (2).

[0012] As a further technical solution, a support column (3) is fixed at the top of the liquid storage tank (1). A servo motor (4) is fixedly installed at the top of the support column (3). The output end of the servo motor (4) is fixedly connected with a main shaft. The main shaft penetrates through the support column (3) and extends into the liquid storage tank (1). The servo motor (4) is electrically connected to the control box (2).

[0013] A rotating cylinder (200) is rotatably installed inside the liquid storage tank (1).

[0014] As a further technical solution, three partition plates (18) which are integrally formed and evenly distributed in a circular axis are arranged inside the rotating cylinder (200). The three partition plates (18) divide the inside of the rotating cylinder (200) into a nutrient bin (201), a repair bin (202) and a water injection bin (203).

[0015] As a further technical solution, a driving gear (14) is also fixedly sleeved on the outside of the main shaft. The driving gear (14) meshes with two driven gears (15). The driven gears (14) are respectively fixedly sleeved on two rotating shafts (16). The two rotating shafts (16) are respectively located inside the nutrient bin (201) and the repair bin (202). Stirring blades (17) are also fixedly installed on the outside of the rotating shafts (16) by screws.

[0016] As a further technical solution, a sealing baffle (20) is fixed to the inner wall of the rotary drum (200) by screws. The rotary drum (200) is in sealed rotational connection with the sealing baffle (20). A delivery port (21) is formed at the bottom of the sealing baffle (20). Liquid outlets (19) corresponding to the delivery port (21) are formed at the bottoms of the nutrient tank (201), the repair tank (202), and the water injection tank (203).

[0017] As a further technical solution, a cylinder (22) is fixedly installed at the bottom of the sealing baffle (20). One end of a connecting rod (24) is fixed to the output end of the cylinder (22). The other end of the connecting rod (24) is fixedly connected to a piston (23). The center of the piston (23) rod is on the same axis as the center of the delivery port (21). The cylinder (22) is electrically connected to the control box (2).

[0018] As a further technical solution, triangularly distributed support plates (13) are fixed to the inner peripheral surface of the liquid storage tank (1) near its top opening by screws.

[0019] As a further technical solution, a pressure sensor is fixedly installed inside the liquid storage tank (1). The pressure sensor is electrically connected to the control box (2).

[0020] The second aspect of the present invention provides a method for using a buried pipe type soil energy storage device.

[0021] A method for using a buried pipe type soil energy storage device includes:[[]]END]]

[0022] Respectively input raw materials for preparing nutrient solution, raw materials for preparing urea water, and water solution into the nutrient tank (201), the repair tank (202), and the water injection tank (203) through the feeding port (12);

[0023] Start the servo motor (4) to drive the rotary drum (200) and the stirring blades (17) to rotate, and mix the raw materials to prepare nutrient solution and urea water;

[0024] Monitor the temperature, humidity, thermal conductivity, and density of the soil through the integrated induction strip (9), and transmit the data to the control box (2);

[0025] According to the monitored data, the control box (2) automatically adjusts the working states of the servo motor (4) and the liquid pump (6), and selectively transports the nutrient solution, urea water, or water solution to the soil through the permeation pipe (8);

[0026] When the thermal conductivity and density of the soil are insufficient, transport the nutrient solution to promote calcium carbonate deposition and enhance the thermal conductivity and density of the soil; when the water content of the soil is insufficient, transport the water solution to supplement the soil moisture; when the density of the soil is insufficient, transport the urea water to repair the soil cracks.

[0027] The above one or more technical solutions have the following beneficial effects:

[0028] 1. In the present invention, through the settings of structures such as a liquid storage tank, a nutrient chamber, a repair chamber, and a water injection chamber, according to the monitoring and feedback of the system on the soil, the liquid to be transported can be switched, thereby ensuring the soil density and significantly improving the soil thermal conductivity. The deposition of calcium carbonate not only improves the soil's heat conduction characteristics but also enhances its compressive strength and crack resistance. Urea can effectively repair soil cracks, thus effectively improving the operation efficiency and long-term stability of the ground source heat pump system.

[0029] 2. In the present invention, through the settings of structures such as a control box and an integrated induction strip, the integrated induction strip is used to monitor parameters such as the thermal conductivity, humidity, and temperature of the soil in real time. Through data transmission to the control system, the control system automatically adjusts the injection volume and reaction time of the microbial culture solution according to the soil state. The system can automatically adjust according to different soil types and reaction conditions to ensure the optimization of the modification effect.

[0030] 3. In the present invention, through the settings of structures such as a liquid extraction pump, a permeation tube, and a control box, the control system is responsible for adjusting the injection volume, injection rate, and reaction duration of the microbial culture solution to ensure effective modification under different soil conditions. At the same time, according to the feedback data of the soil monitoring system, the injection parameters are automatically adjusted to achieve refined control.

[0031] 4. The present invention uses the natural action of microorganisms based on the MICP technology, which is environmentally friendly and has a relatively low cost. It can effectively reduce the use of traditional heat exchange materials and lower the system operation cost.

[0032] Advantages of additional aspects of the present invention will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings forming a part of this specification 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.

[0034] Figure 1 It is a schematic diagram of the overall structure of the device in Embodiment 1 of the present invention;

[0035] Figure 2 It is a partial structural schematic diagram highlighting the permeation tube in Embodiment 1 of the present invention;

[0036] Figure 3 It is a schematic diagram from another perspective in Embodiment 1 of the present invention;

[0037] Figure 4Right view of the device according to Embodiment 1 of the present invention;

[0038] Figure 5 Top view of the device according to Embodiment 1 of the present invention;

[0039] Figure 6 Schematic structural view of the driving gear and the driven gear meshing in Embodiment 1 of the present invention;

[0040] Figure 7 Schematic internal structural view of the rotary drum in Embodiment 1 of the present invention;

[0041] Figure 8 Schematic structural view of the rotary drum and the sealing plate in Embodiment 1 of the present invention;

[0042] Figure 9 Schematic structural view of the bottom of the rotary drum in Embodiment 1 of the present invention.

[0043] Reference numerals in the figure:

[0044] 1. Liquid storage tank; 2. Control box; 3. Support column; 4. Servo motor; 5. Delivery pipeline; 6. Liquid pump; 7. Branch pipe; 8. Permeation pipe; 9. Integrated induction strip; 10. Permeation hole; 11. Pipe joint; 12. Feeding port; 13. Support plate; 14. Driving gear; 15. Driven gear; 16. Rotating shaft; 17. Stirring blade; 18. Partition board; 19. Liquid outlet; 20. Sealing baffle; 21. Delivery port; 22. Cylinder; 23. Piston; 24. Connecting rod; 100. Leg; 200. Rotary drum; 201. Nutrition bin; 202. Repair bin; 203. Water injection bin. Detailed implementation manners

[0045] It should be noted that the following detailed description is exemplary and is intended to provide further illustration of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0046] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary implementation manners of the present invention.

[0047] Without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0048] Embodiment 1

[0049] This embodiment discloses a buried pipe type soil energy storage device;

[0050] As Figure 1 shown, a buried pipe type soil energy storage device includes:

[0051] Please refer toFigures 1-9 , a buried pipe type soil energy storage device, comprising a support leg 100, a liquid storage tank 1 and a control box 2 fixed on the support leg 100. The top of the liquid storage tank 1 is provided with a feeding port 12. A conveying pipeline 5 is fixedly installed at the bottom of the liquid storage tank 1. One end of the conveying pipeline 5 is fixedly connected with a branch pipe 7. One end of the branch pipe 7 is fixed with a pipe joint 11 by screws. A plurality of infiltration pipes 8 distributed in an array are fixedly installed at the bottom of the branch pipe 7. A plurality of infiltration holes 10 are formed on the outer peripheral surface of the infiltration pipe 8; An integrated induction strip 9 is installed on the outer peripheral surface of each of the plurality of infiltration pipes 8. A liquid pump 6 is fixedly installed on the conveying pipeline 5. The integrated induction strip 9 and the liquid pump 6 are both electrically connected to the control box 2.

[0052] Further, a temperature sensor, a humidity sensor, a soil detector and a data acquisition module are sequentially installed inside the integrated induction strip 9. A main control unit, an operation interface, a PLC controller and a data processing unit are sequentially installed on the control box 2. A support column 3 is fixed on the top of the liquid storage tank 1. A servo motor 4 is fixedly installed on the top of the support column 3. The output end of the servo motor 4 is fixedly connected with a main shaft. The main shaft penetrates through the support column 3 and extends into the liquid storage tank 1. The servo motor 4 is electrically connected to the control box 2; A rotating cylinder 200 is rotatably installed inside the liquid storage tank 1. The rotation of the main shaft is driven by the servo motor 4 to drive the rotation of the rotating cylinder 200; Three partition plates 18 which are integrally formed and evenly distributed in a circular shaft shape are arranged inside the rotating cylinder 200. The three partition plates 18 divide the inside of the rotating cylinder 200 into a nutrient bin 201, a repair bin 202 and a water injection bin 203. An active gear 14 is also fixedly sleeved on the outside of the main shaft. The active gear 14 meshes with two driven gears 15. The driven gears 15 are respectively fixedly sleeved on the rotating shafts 16. The two rotating shafts 16 are respectively located inside the nutrient bin 201 and the repair bin 202. A stirring blade 17 is also fixedly installed on the outside of the rotating shaft 16 by screws. The rotation of the driven gear is driven by the active gear, and then the liquid inside the nutrient bin 201 and the repair bin 202 can be stirred by the stirring blade 17 on the rotating shaft 16.

[0053] It should be noted that a sealing baffle 20 is fixed to the inner wall of the rotary drum 200 by screws. The rotary drum 200 is in sealed rotational connection with the sealing baffle 20. A delivery port 21 is provided at the bottom of the sealing baffle 20. Liquid outlet ports 19 corresponding to the delivery port 21 are provided at the bottoms of the nutrient tank 201, the repair tank 202, and the water injection tank 203. A cylinder 22 is fixedly installed at the bottom of the sealing baffle 20. One end of a connecting rod 24 is fixed to the output end of the cylinder 22. The other end of the connecting rod 24 is fixedly connected to a piston 23. The piston rod of the piston 23 is on the same axis as the center of the delivery port 21. The cylinder 22 is electrically connected to the control box 2. Triangularly distributed support plates 13 are fixed to the inner peripheral surface of the liquid storage tank 1 near its top opening by screws. The stable support of the servo motor 4 is achieved through the cooperation of the support plates 13 and the support columns 3. A pressure sensor is fixedly installed inside the liquid storage tank 1. The pressure sensor is electrically connected to the control box 2. Through the settings of structures such as the liquid storage tank 1, the nutrient tank 201, the repair tank 202, and the water injection tank 203, according to the monitoring and feedback of the system on the soil, the liquid to be delivered can be switched, thereby ensuring the soil density and significantly improving the soil thermal conductivity. The deposition of calcium carbonate not only improves the soil heat conduction characteristics but also enhances its compressive strength and crack resistance. Urea can effectively repair soil cracks, thereby effectively improving the operation efficiency and long-term stability of the ground source heat pump system. Through the settings of structures such as the control box 2 and the integrated induction strip 9, the integrated induction strip 9 is used to monitor parameters such as the thermal conductivity, humidity, and temperature of the soil in real time. Through data transmission to the control system, the control system automatically adjusts the injection amount and reaction time of the microbial culture solution according to the soil state. The system can be automatically adjusted according to different soil types and reaction conditions to ensure the optimization of the modification effect. Through the settings of structures such as the liquid extraction pump, the permeation pipe 8, and the control box 2, the control system is responsible for adjusting the injection amount, injection rate, and reaction duration of the microbial culture solution to ensure effective modification under different soil conditions. At the same time, the injection parameters are automatically adjusted according to the feedback data of the soil monitoring system to achieve refined control. Based on the MI CP technology, the natural action of microorganisms is used, which is environmentally friendly and has a low cost. It can effectively reduce the use of traditional heat exchange materials and reduce the system operation cost.

[0054] Embodiment 2

[0055] This embodiment discloses a method for using a buried tube soil energy storage device;

[0056] As Figure 2 shown, a method for using a buried tube soil energy storage device includes:

[0057] Respectively put the raw materials for preparing nutrient solution, the raw materials for preparing urea water, and the water solution into the nutrient tank 201, the repair tank 202, and the water injection tank 203 through the feeding port 12;

[0058] Start the servo motor 4 to drive the rotating drum 200 and the stirring blade 17 to rotate, and mix the raw materials to prepare nutrient solution and urea water;

[0059] Monitor the temperature, humidity, thermal conductivity and density of the soil through the integrated induction strip 9, and transmit the data to the control box 2;

[0060] According to the monitored data, the control box 2 automatically adjusts the working states of the servo motor 4 and the liquid pump 6, and selectively transports the nutrient solution, urea water or water liquid to the soil through the permeation pipe 8;

[0061] When the thermal conductivity and density of the soil are insufficient, transport the nutrient solution to promote calcium carbonate deposition and enhance the thermal conductivity and density of the soil; when the water content of the soil is insufficient, transport the water liquid to supplement the soil moisture; when the density of the soil is insufficient, transport the urea water to repair the soil cracks.

[0062] Specifically, during use, put the raw materials for preparing nutrient solution, the raw materials for preparing urea water and the water liquid into the nutrient tank 201, the repair tank 202 and the water injection tank 203 respectively through the upper feeding port 12. Then start the servo motor 4, and the servo motor 4 drives the internal rotating drum 200 and the rotating shaft 16 to move. The stirring blade 17 on the rotating shaft 16 mixes the internal raw materials to make the corresponding nutrient solution and urea water. At this time, the delivery port 21 at the bottom of the sealing baffle 20 is blocked by the piston 23;

[0063] Among them, the main control unit is responsible for making decisions based on real-time data, the operation interface facilitates users to set and view the system operation status, the PLC controller performs specific adjustment operations, and the data processing unit analyzes and feeds back the soil change data;

[0064] Furthermore, during installation, the permeation pipe 8 needs to be installed inside the soil to be cultivated. The integrated induction strip 9 outside the permeation pipe 8 integrates a temperature sensor, a humidity sensor, a soil detector and a data acquisition module, monitors the temperature, thermal conductivity, humidity, water content in the soil, and the density and structural changes of the soil, and transmits the data to the control box 2. When the thermal conductivity and the density of the soil are insufficient, the control box 2 sends out a signal, the servo motor 4 works to rotate the nutrient tank 201 to the working position, the bottom delivery port 21 is opened, the corresponding liquid outlet 19 is aligned with the delivery port 21, and the liquid pumping pump is turned on to send the dropped microbial nutrient solution to the soil through the delivery pipeline 5, the branch pipe 7 and the permeation pipe 8 to supplement the nutrient components. Under the action of microorganisms, calcium carbonate is deposited between soil particles, increasing the density of the soil and significantly improving the thermal conductivity of the soil;

[0065] In addition, when the feedback data indicates insufficient water content in the soil, the control box 2 rotates the water injection bin 203 to the working position, and the liquid extraction pump injects water into the soil through each permeation pipe 8 to supplement the water content. Similarly, when the soil density is insufficient, the repair bin 202 rotates to the working position, and the urea water is also pumped out and sent into the soil to repair the cracks inside the soil.

[0066] It should be noted that when making the liquid inside, the air cylinder 22 retracts the connecting rod 24, so that the piston 23 blocks the delivery port 21. When delivering the liquid, the connecting rod 24 extends, so that the piston 23 is separated from the delivery port 21.

[0067] Although the specific implementation manners of the present invention have been described above in conjunction with the accompanying drawings, it is not a limitation on the protection scope of the present invention. Those skilled in the art should understand that based on the technical solution of the present invention, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present invention.

Claims

1. A buried pipe soil energy storage device, comprising a support leg (100), a liquid storage tank (1) fixed on the support leg (100) and a control box (2), characterized in that: The top of the liquid storage tank (1) is provided with a feeding port (12), the bottom of the liquid storage tank (1) is fixedly provided with a delivery pipe (5), one end of the delivery pipe (5) is fixedly connected with a branch pipe (7), one end of the branch pipe (7) is fixed with a pipe joint (11) by means of screws, a plurality of permeation pipes (8) distributed in an array are fixedly provided at the bottom of the branch pipe (7), and a plurality of permeation holes (10) are provided on the outer peripheral surface of the permeation pipe (8); An integrated sensor strip (9) is installed on the outer circumference of the plurality of permeation tubes (8), a liquid pump (6) is fixedly installed on the delivery pipeline (5), and the integrated sensor strip (9) and the liquid pump (6) are both electrically connected to the control box (2).

2. The buried pipe soil energy storage device according to claim 1, characterized in that: The integrated sensing strip (9) is provided with a temperature sensor, a humidity sensor, a soil detector and a data acquisition module in sequence, and the control box (2) is provided with a main control unit, an operation interface, a PLC controller and a data processing unit in sequence.

3. The buried pipe soil energy storage device according to claim 1, characterized in that: A support column (3) is fixed on the top of the liquid storage tank (1), a servo motor (4) is fixedly installed on the top of the support column (3), an output end of the servo motor (4) is fixedly connected to a main shaft, the main shaft passes through the support column (3) and extends to the inside of the liquid storage tank (1), and the servo motor (4) is electrically connected to the control box (2); A rotating drum (200) is rotatably mounted inside the liquid storage tank (1).

4. The buried pipe soil energy storage device according to claim 3, characterized in that: The interior of the rotating drum (200) is provided with three partitions (18) which are integrally formed and evenly distributed in a circular axis, and the three partitions (18) divide the interior of the rotating drum (200) into a nutrient bin (201), a repair bin (202), and a water injection bin (203).

5. The buried pipe soil energy storage device according to claim 4, characterized in that: A driving gear (14) is fixedly sleeved on the outside of the main shaft, and the driving gear (14) is meshed with two driven gears (15). The driven gears (14) are respectively fixedly sleeved on two rotating shafts (16). The two rotating shafts (16) are respectively located inside the nutrition bin (201) and the repair bin (202), and a stirring blade (17) is also fixedly installed on the outside of the rotating shaft (16) by means of screws.

6. The buried pipe soil energy storage device according to claim 4, characterized in that: A sealing baffle (20) is fixed to the inner wall of the rotating drum (200) by screws, and the rotating drum (200) is connected to the sealing baffle (20) in a sealed and rotatable manner. A delivery port (21) is provided at the bottom of the sealing baffle (20), and liquid outlets (19) corresponding to the delivery port (21) are provided at the bottoms of the nutrient bin (201), the repair bin (202), and the water injection bin (203).

7. The buried pipe soil energy storage device according to claim 6, characterized in that: A cylinder (22) is fixedly mounted at the bottom of the sealing baffle (20); one end of a connecting rod (24) is fixedly mounted at the output end of the cylinder (22); the other end of the connecting rod (24) is fixedly connected to a piston (23); the piston (23) rod and the center of the delivery port (21) are on the same axis; and the cylinder (22) is electrically connected to the control box (2).

8. The buried pipe soil energy storage device according to claim 5, characterized in that: A triangularly distributed support plate (13) is fixed by screws on the inner circumferential surface of the liquid storage tank (1) close to the top opening thereof.

9. The buried pipe soil energy storage device according to claim 1, characterized in that: A pressure sensor is fixedly installed inside the liquid storage tank (1), and the pressure sensor is electrically connected to the control box (2).

10. A method for using the buried pipe soil energy storage device according to any one of claims 1 to 9, characterized in that ,include: The raw materials for preparing the nutrient solution, the raw materials for preparing the urea water and the water are respectively fed into the nutrient bin (201), the repair bin (202) and the water injection bin (203) through the feeding port (12); Starting the servo motor (4) to drive the rotating drum (200) and the stirring blade (17) to rotate, mixing the raw materials to prepare the nutrient solution and urea water; The temperature, humidity, thermal conductivity and compactness of the soil are monitored through an integrated sensor strip (9) and the data are transmitted to a control box (2); According to the monitoring data, the control box (2) automatically adjusts the working state of the servo motor (4) and the liquid pump (6), and selectively transports the nutrient solution, urea water or water liquid to the soil through the infiltration tube (8); When the thermal conductivity and density of the soil are insufficient, nutrient solution is transported to promote the deposition of calcium carbonate and enhance the thermal conductivity and density of the soil; when the moisture content of the soil is insufficient, water is transported to replenish the soil moisture; when the soil density is insufficient, urea water is transported to repair soil cracks.

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