Water delivery device for greenhouse irrigation

Abstract

The invention relates to a greenhouse irrigation water delivery device which comprises a first delivery pipe, the first delivery pipe comprises a first transverse pipe and a first longitudinal pipe, the first transverse pipe is provided with a second delivery pipe and a third delivery pipe, and the third delivery pipe and the second delivery pipe each comprise a second transverse pipe and a second longitudinal pipe; a plurality of fourth conveying pipes are arranged on a second transverse pipe of the third conveying pipe and a second transverse pipe of the second conveying pipe, the inner diameters of the fourth conveying pipes are gradually increased in the direction from the position close to the first conveying pipe to the position away from the first conveying pipe, and a first water conveying hole is formed in the middle of each fourth conveying pipe; a plurality of second water conveying holes are formed in the fourth conveying pipe on the two sides of the first water conveying hole, and the hole diameters of the second water conveying holes in each side of the first water conveying hole are gradually decreased in the direction from the position close to the first water conveying hole to the position away from the first water conveying hole. And water can be uniformly conveyed to the soil in the greenhouse. The device is convenient to use and has a wide market prospect.

Description

Technical Field

[0001] The present invention relates to the field of water conveyance equipment for greenhouse irrigation, and particularly to a water conveyance device for greenhouse irrigation. Background Art

[0002] When watering vegetables in greenhouse greenhouses, flood irrigation is used, which has disadvantages such as large water consumption, serious diseases, reduced room temperature, and poor vegetable quality. Moreover, during the stage when the greenhouse land is idle and the soil moisture and soil base fertilizer are adjusted. The flood irrigation method is likely to cause inconsistent moisture in different high and low areas of the greenhouse. And during the stage of fertilization after adjusting the moisture, even if fertilization is carried out evenly. The chemical fertilizers entering the soil will migrate to the areas with more moisture, which leads to a very serious problem that the soil in the greenhouse has inconsistent water and fertilizer, causing different growth of crops.

[0003] During the stage of soil idling for water and fertilizer adjustment, reduce the migration of dissolved chemical fertilizers caused by inconsistent soil moisture during the fertilization stage, resulting in inconsistent soil nutrients, and the phenomenon that some soil areas are nutrient-deficient while other areas are nutrient-excessive. Both nutrient deficiency and nutrient excess will affect the growth of crops. Therefore, there is room for improvement in the prior art, aiming to reasonably control the water conveyance volume to each area of the soil in the greenhouse, so that the soil in the greenhouse can evenly obtain moisture, and then make the humidity of the soil in the greenhouse as close as possible after watering, reducing the problem that inconsistent soil nutrients affect crop growth during the subsequent fertilization process. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a water conveyance device for greenhouse irrigation that can evenly convey water to the soil in the greenhouse so that the soil in the greenhouse can evenly obtain moisture, for overcoming the defects in the prior art.

[0005] The technical solution adopted by the present invention is as follows: A water delivery device for greenhouse irrigation includes a first delivery pipe. The first delivery pipe adopts a T-shaped tubular structure composed of a first horizontal pipe and a first vertical pipe. A second delivery pipe is arranged at one end of the first horizontal pipe, and a third delivery pipe is arranged at the other end of the first horizontal pipe. Both the third delivery pipe and the second delivery pipe adopt an L-shaped tubular structure composed of a second horizontal pipe and a second vertical pipe. The second horizontal pipe of the third delivery pipe is parallel to the second horizontal pipe of the second delivery pipe. A fourth delivery pipe is arranged on the second horizontal pipe of the third delivery pipe and the second horizontal pipe of the second delivery pipe. The number of the fourth delivery pipes is several, and the inner diameters of the several fourth delivery pipes gradually increase in the direction from near the first delivery pipe to far from the first delivery pipe. A first water delivery hole is respectively arranged in the middle of the bottom end of each fourth delivery pipe. Several second water delivery holes are respectively arranged on the fourth delivery pipes on both sides of the first water delivery hole. The apertures of the several second water delivery holes on each side of the first water delivery hole gradually decrease in the direction from near the first water delivery hole to far from the first water delivery hole. The aperture of the first water delivery hole is not less than that of the second water delivery hole.

[0006] Preferably, a first pressure sensor is arranged on the second vertical pipe of the second delivery pipe, and a second pressure sensor is arranged on the third delivery pipe on one side of the first pressure sensor. Pipeline sealing devices are respectively arranged on the first delivery pipe and the third delivery pipe, and on the first delivery pipe and the second delivery pipe. The pipeline sealing device includes a first flange arranged on the first delivery pipe, a sealing groove opened on the inner side of the first delivery pipe outside the second delivery pipe or the third delivery pipe, a sealing filler and a sealing gland arranged in sequence on the sealing groove in the direction from near the first vertical pipe to far from the first vertical pipe, a second flange arranged on the sealing gland on one side of the first flange, and fastening bolts arranged on the first flange and the second flange.

[0007] Preferably, hydraulic driving devices are respectively arranged on the first delivery pipe and the third delivery pipe, and on the first delivery pipe and the second delivery pipe. Each hydraulic driving device includes transmission rods symmetrically arranged on both sides of the second horizontal pipe of the third delivery pipe or the second horizontal pipe of the second delivery pipe, and hydraulic cylinders respectively arranged on each transmission rod and the first horizontal pipe.

[0008] Preferably, the second horizontal pipe of the third delivery pipe and the second horizontal pipe of the second delivery pipe are both installed on the first horizontal pipe of the first delivery pipe. Connecting wing plates are respectively arranged on the second horizontal pipe of the third delivery pipe and the second horizontal pipe of the second delivery pipe. A connecting rod is arranged on several connecting wing plates, and a limiting sliding sleeve is arranged on the first horizontal pipe of the first delivery pipe. The limiting sliding sleeve is movably sleeved on the connecting rod.

[0009] Preferably, the inner diameters of the second horizontal pipes of the third delivery pipes near one end close to the first delivery pipe and the inner diameters of the second horizontal pipes of the second delivery pipes near one end close to the first delivery pipe both gradually increase in the direction from near the first vertical pipe to away from the first vertical pipe. A reducing delivery pipe is respectively arranged between each fourth delivery pipe and the third delivery pipe and between each fourth delivery pipe and the second delivery pipe. Each reducing delivery pipe sequentially includes a first straight pipe section, a reducing section, and a second straight pipe section in the direction from near the fourth delivery pipe to away from the fourth delivery pipe. A first stop valve is respectively arranged on each of the second straight pipe sections, and the first straight pipe section of each reducing delivery pipe is connected to the adjacent fourth delivery pipe.

[0010] Preferably, a plurality of fifth delivery pipes are sequentially arranged at intervals along the direction from near the first delivery pipe to away from the first delivery pipe on the second horizontal pipes of the third delivery pipes and the second horizontal pipes of the third delivery pipes. A second stop valve is respectively arranged on each fifth delivery pipe. Pressure rings are arranged on the plurality of fifth delivery pipes. A water delivery network is arranged inside the pressure rings. A plurality of nozzles are evenly arranged on the water delivery network. A nozzle connecting pipe is respectively arranged between each nozzle and the water delivery network. An electromagnetic valve is respectively arranged on each nozzle connecting pipe. The water delivery network adopts a mesh structure composed of a plurality of third vertical pipes and a plurality of third horizontal pipes intersecting vertically and horizontally.

[0011] Preferably, a buffer tank is arranged at the inlet end of the first vertical pipe of the first delivery pipe. A sixth delivery pipe is arranged between the buffer tank and the first delivery pipe. The number of the sixth delivery pipes is two. A seventh stop valve, a third pressure sensor, a filter, a fourth pressure sensor, a booster pump, a liquid flow sensor, and a first regulating valve are arranged on one side of each sixth delivery pipe in the direction from near the buffer tank to away from the buffer tank. The sixth delivery pipes between the two booster pumps and the liquid flow sensor are communicated through a first backflush connecting pipe. A second regulating valve is arranged on the first backflush connecting pipe. The sixth delivery pipes between the two third pressure sensors and the seventh stop valve are communicated through a second backflush connecting pipe. Two third stop valves are arranged on the second backflush connecting pipe. The second backflush connecting pipe between the two third stop valves is communicated through a first sewage discharge pipe. A turbidity detector is arranged on the first sewage discharge pipe.

[0012] Preferably, a liquid level sensor is arranged on the buffer tank. A seventh delivery pipe and an exhaust valve are arranged at the top of the buffer tank. An eighth delivery pipe is arranged on the two sixth delivery pipes and the buffer tank. The inlet end of the eighth delivery pipe is communicated with the middle part of the buffer tank. A second sewage discharge pipe is arranged at the bottom of the buffer tank. A sixth stop valve is arranged on the second sewage discharge pipe.

[0013] The beneficial effects of the present invention are as follows: First of all, the present invention realizes uniform water delivery to the soil in the greenhouse, enabling the soil in the greenhouse to obtain water evenly, and solving the problem that the traditional flood irrigation method leads to different soil moisture due to inconsistent soil flatness. This reduces the phenomenon that during the subsequent stage of applying chemical fertilizers, the chemical fertilizers dissolve in the soil and migrate to the areas with high humidity due to inconsistent soil moisture, resulting in differences in soil water and fertilizer caused by inconsistent soil moisture.

[0014] Secondly, on one side of each sixth delivery pipe of the present invention along the direction from near the buffer tank to far from the buffer tank, there are a seventh stop valve, a third pressure sensor, a filter, a fourth pressure sensor, a booster pump, a liquid flow sensor, and a first regulating valve. The installation of the third pressure sensor and the fourth pressure sensor is for facilitating the feedback of pressure parameters.

[0015] Finally, a liquid level sensor is provided on the buffer tank of the present invention, and the installation of the liquid level sensor is for facilitating the feedback of liquid level parameters.

[0016] The present invention has a simple structure, convenient operation, ingenious design, greatly improves work efficiency, has good social and economic benefits, and is a product that is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the present invention.

[0018] Figure 2 is Figure 1 A partially enlarged schematic diagram of detail A.

[0019] Figure 3 It is a schematic structural diagram of the present invention.

[0020] Figure 4 It is a schematic structural diagram of the present invention.

[0021] Figure 5 It is a schematic structural diagram of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0022] Such as Figures 1 to 5As shown in the figure, a water delivery device for greenhouse irrigation includes a first delivery pipe 1. The first delivery pipe 1 adopts a T-shaped tubular structure composed of a first horizontal pipe and a first vertical pipe. One end of the first horizontal pipe is provided with a second delivery pipe 2, and the other end of the first horizontal pipe is provided with a third delivery pipe 3. Both the third delivery pipe 3 and the second delivery pipe 2 adopt an L-shaped tubular structure composed of a second horizontal pipe and a second vertical pipe. The second horizontal pipe of the third delivery pipe 3 is parallel to the second horizontal pipe of the second delivery pipe 2. A fourth delivery pipe 4 is provided on the second horizontal pipes of the third delivery pipe 3 and the second delivery pipe 2. Installing the third delivery pipe 3 and the second delivery pipe 2 facilitates the installation of the fourth delivery pipe 4 and simultaneously uses the third delivery pipe 3 and the second delivery pipe 2 to deliver water to the fourth delivery pipe 4; the number of the fourth delivery pipes 4 is several. Since as the position of the fourth delivery pipe 4 gradually moves away from the first delivery pipe 1, the water delivered from the first delivery pipe 1 to the fourth delivery pipe 4 is affected by the flow resistance of the third delivery pipe 3 or the second delivery pipe 2 itself, the water pressure will also decrease. Therefore, the inner diameters of several fourth delivery pipes 4 of this product gradually increase along the direction from near the first delivery pipe 1 to far from the first delivery pipe 1, so that the water flowing into the fourth delivery pipe 4 after throttling gradually decreases as the fourth delivery pipe 4 gradually moves away from the first delivery pipe 1, making the pressures in several fourth delivery pipes 4 tend to be consistent; further, since one end of the fourth delivery pipe 4 receives the water delivered by the third delivery pipe 3 and the other end of the fourth delivery pipe 4 receives the water delivered by the second delivery pipe 2, due to the influence of the inherent flow resistance of the fourth delivery pipe 4, the liquid pressure in the middle of the fourth delivery pipe 4 is the smallest. Therefore, a first water delivery hole 5 is respectively provided in the middle of the bottom end of each fourth delivery pipe 4 of this product, and several second water delivery holes 6 are respectively provided on the fourth delivery pipes 4 on both sides of the first water delivery hole 5. The apertures of several second water delivery holes 6 on each side of the first water delivery hole 5 gradually decrease along the direction from near the first water delivery hole 5 to far from the first water delivery hole 5, and the aperture of the first water delivery hole 5 is not less than the aperture of the second water delivery hole 6. As several second water delivery holes 6 gradually approach the first water delivery hole 5, the apertures of several second water delivery holes 6 gradually increase and the throttling gradually weakens, so that the drainage flow rates through the first water delivery hole 5 and the second water delivery holes 6 are approximately the same. Several fourth delivery pipes 4 are all parallel to the first horizontal pipe of the first delivery pipe 1. The third delivery pipe 3 and the second delivery pipe 2 have the same specifications. The straight-line distance from the connection between each fourth delivery pipe 4 and the third delivery pipe 3 to the first horizontal pipe of the first delivery pipe 1 and the straight-line distance from the connection between each fourth delivery pipe 4 and the second delivery pipe 2 to the first horizontal pipe of the first delivery pipe 1 are equal.

[0023] Furthermore, although the structures and installation positions of the third delivery pipe 3 and the second delivery pipe 2 are approximately the same, due to the fact that the first delivery pipe 1 adopts a T-shaped tubular structure, there are also differences in the pressure of delivering water from the inlet end of the first longitudinal pipe of the first delivery pipe 1 to both ends of the first transverse pipe of the first delivery pipe 1. And on the second longitudinal pipe of the second delivery pipe 2 described in this product, a first pressure sensor 7 is provided, and on the third delivery pipe 3 on one side of the first pressure sensor 7, a second pressure sensor 8 is provided. Pipe sealing devices are respectively provided on the first delivery pipe 1 and the third delivery pipe 3, and on the first delivery pipe 1 and the second delivery pipe 2. The pipe sealing device includes a first flange 9 provided on the first delivery pipe 1, a sealing groove 10 opened on the inner side of the first delivery pipe 1 outside the second delivery pipe 2 or the third delivery pipe 3, a sealing filler 11 and a sealing sleeve 12 sequentially arranged on the sealing groove 10 along the direction from near the first longitudinal pipe to far from the first longitudinal pipe, a second flange 13 provided on the sealing sleeve 12 on one side of the first flange 9, and fastening bolts 14 provided on the first flange 9 and the second flange 13. This enables the positions of the third delivery pipe 3 and the second delivery pipe 2 on the first delivery pipe 1 to be adjusted, thereby adjusting the pressures on both sides of the fourth delivery pipe 4. And in order to further facilitate the adjustment of the positions of the third delivery pipe 3 and the second delivery pipe 2 on the first delivery pipe 1, hydraulic drive devices are respectively provided on the first delivery pipe 1 and the third delivery pipe 3, and on the first delivery pipe 1 and the second delivery pipe 2. Each hydraulic drive device includes drive rods 15 symmetrically arranged on both sides of the second transverse pipe of the third delivery pipe 3 or the second transverse pipe of the second delivery pipe 2, and hydraulic cylinders 16 respectively provided on each drive rod 15 and the first transverse pipe. Further still, after adjusting the positions of the third delivery pipe 3 and the second delivery pipe 2 on the first delivery pipe 1, the fourth delivery pipe 4 still needs to be installed on the third delivery pipe 3 and the second delivery pipe 2. In order to facilitate the control of the distance between the third delivery pipe 3 and the second delivery pipe 2 so as to more conveniently install the fourth delivery pipe 4, the second transverse pipe of the third delivery pipe 3 and the second transverse pipe of the second delivery pipe 2 are both installed on the first transverse pipe of the first delivery pipe 1. Connection wing plates 17 are respectively provided on the second transverse pipe of the third delivery pipe 3 and the second transverse pipe of the second delivery pipe 2. A connecting rod 18 is provided on several connection wing plates 17, and a limit sliding sleeve 19 is provided on the first transverse pipe of the first delivery pipe 1. The limit sliding sleeve 19 is movably sleeved on the connecting rod 18. Further still, the inner diameters of the end of the second transverse pipe of the third delivery pipe 3 close to the first delivery pipe 1 and the end of the second transverse pipe of the second delivery pipe 2 close to the first delivery pipe 1 both gradually increase along the direction from near the first longitudinal pipe to far from the first longitudinal pipe, thereby reducing the turbulence that occurs when water flows into pipes with different diameters due to the change in pipe diameter.

[0024] After the initial irrigation of the greenhouse soil, it is convenient to replenish water for the crops in the later stage and to disassemble the fourth delivery pipe 4. A variable-diameter delivery pipe 20 is respectively provided between each fourth delivery pipe 4 and the third delivery pipe 3 and between each fourth delivery pipe 4 and the second delivery pipe 2. Each variable-diameter delivery pipe 20 sequentially includes a first straight pipe section, a variable-diameter section, and a second straight pipe section along the direction from near the fourth delivery pipe 4 to far from the fourth delivery pipe 4. A first stop valve 21 is respectively provided on each of the second straight pipe sections. The first straight pipe section of each variable-diameter delivery pipe 20 is connected to the adjacent fourth delivery pipe 4. The variable-diameter delivery pipe 20 is used to throttle the water delivered from the third delivery pipe 3 or the second delivery pipe 2, and the installation of the first stop valve 21 on the variable-diameter delivery pipe 20 facilitates cutting off the water flow so as to facilitate the disassembly of the fourth delivery pipe 4.

[0025] After the irrigation is completed, water is replenished according to the inconsistent humidity in each area of the greenhouse soil or during the growth of the crops. Along the direction from near the first delivery pipe 1 to far from the first delivery pipe 1, a number of fifth delivery pipes 22 are sequentially and spacedly provided on the second horizontal pipe of the third delivery pipe 3 and the second horizontal pipe of the third delivery pipe 3. A second stop valve 23 is respectively provided on each of the fifth delivery pipes 22. A pressure equalizing ring 24 is provided on a number of the fifth delivery pipes 22. A water delivery network 25 is provided inside the pressure equalizing ring 24. A number of nozzles 26 are evenly provided on the water delivery network 25. A nozzle connecting pipe 27 is respectively provided between each nozzle 26 and the water delivery network 25. An electromagnetic valve 28 is respectively provided on each nozzle connecting pipe 27. The water delivery network 25 adopts a mesh structure composed of a number of third vertical pipes and a number of third horizontal pipes intersecting vertically and horizontally. Thus, the pressure equalizing ring 24 equalizes the water delivered by a number of fifth delivery pipes 22 and then delivers it into the water delivery network 25, so that the pressures at the water inlet ends of a number of nozzles 26 tend to be consistent. During the process of evenly replenishing water for the growing crops by a number of nozzles 26, the water spray amounts of a number of nozzles 26 are approximately the same.

[0026] Subject to different water sources, the water from the ditch carries sediment, and the presence of particulate matter in the water flow will clog the nozzle 26. Therefore, a buffer tank 29 is provided at the inlet end of the first vertical pipe of the first delivery pipe 1. A sixth delivery pipe 30 is provided between the buffer tank 29 and the first delivery pipe 1. The number of the sixth delivery pipes 30 is two. Along the direction from near the buffer tank 29 to far from the buffer tank 29, a seventh stop valve 49, a third pressure sensor 31, a filter 32, a fourth pressure sensor 33, a booster pump 34, a liquid flow sensor 35, and a first regulating valve 36 are provided on one side of each sixth delivery pipe 30. The sixth delivery pipes 30 between the two booster pumps 34 and the liquid flow sensor 35 are connected by a first backflush connecting pipe 37. A second regulating valve 38 is provided on the first backflush connecting pipe 37. The sixth delivery pipes 30 between the two third pressure sensors 31 and the seventh stop valve 49 are connected by a second backflush connecting pipe 39. Two third stop valves 40 are provided on the second backflush connecting pipe 39. The second backflush connecting pipe 39 between the two third stop valves 40 is connected by a first sewage discharge pipe 41. A turbidity detector 42 is provided on the first sewage discharge pipe 41. Further, a liquid level sensor 43 is provided on the buffer tank 29. A seventh delivery pipe 44 and an exhaust valve 45 are provided at the top of the buffer tank 29. An eighth delivery pipe 46 is provided on the two sixth delivery pipes 30 and the buffer tank 29. The inlet end of the eighth delivery pipe 46 is connected to the middle of the buffer tank 29. A second sewage discharge pipe 47 is provided at the bottom of the buffer tank 29. A sixth stop valve 48 is provided on the second sewage discharge pipe 47. The buffer tank 29 is used to settle the incoming ditch water, thereby reducing the backflush frequency of the filter 32.

[0027] The usage method of this product is as follows. As Figures 1 to 5 shown, it includes the following steps: S1. The upstream water source delivers water to the buffer tank 29 through the seventh delivery pipe 44. After the water of the upstream water source enters the buffer tank 29, some of the particulate matter carried in the water source stays in the buffer tank 29. The water in the buffer tank 29 above the eighth delivery pipe 46 is delivered to the first delivery pipe 1 through the sixth delivery pipe 30 in the working state to form irrigation water. During the delivery process of the sixth delivery pipe 30 in the working state, the particulate matter is filtered by the corresponding filter 32, then pressurized and driven by the corresponding booster pump 34, and finally the flow parameter is fed back by the corresponding liquid flow sensor 35.

[0028] S2. After the irrigation water conveyed by the sixth conveying pipe 30 in the working state enters the first conveying pipe 1, it is divided into two parts, namely the first part of the irrigation water and the second part of the irrigation water. The first part of the irrigation water is conveyed to the second conveying pipe 2, and the second part of the irrigation water is conveyed into the third conveying pipe 3. At this time, the second cut-off valve 23 is opened. Both the first part of the irrigation water and the second part of the irrigation water enter the pressure equalizing ring 24 and the water delivery network 25 through the corresponding fifth conveying pipe 22, and then are discharged outward through the nozzles 26 until several nozzles 26 can continuously spray water outward. The second cut-off valve 23 and the solenoid valve 28 are closed, and the air in the second conveying pipe 2 and the third conveying pipe 3 is emptied during this process.

[0029] S3. According to the values fed back by the first pressure sensor 7 and the second pressure sensor 8, all the hydraulic cylinders 16 are opened to adjust the positions of the second conveying pipe 2 and the third conveying pipe 3 on the first conveying pipe 1. During this process, by adjusting the inlet oil pressure of each hydraulic cylinder 16, the second conveying pipe 2 and the third conveying pipe 3 can move synchronously. However, restricted by the oil conveying pipes connected to each hydraulic cylinder 16, there are still differences in the oil pressure received by each hydraulic cylinder 16. The connecting rod 18 of this product provides a limiting function so that even if there are slight differences in the oil pressure received by several hydraulic cylinders 16, the second conveying pipe 2 and the third conveying pipe 3 can still maintain the function of synchronous movement. When the values fed back by the first pressure sensor 7 and the second pressure sensor 8 reach the preset range, stop adjusting the positions of the second conveying pipe 2 and the third conveying pipe 3 on the first conveying pipe 1.

[0030] S4. Install the fourth delivery pipe 4 in sequence. After all the fourth delivery pipes 4 are installed, open the first stop valve 21. At this time, a first part of the irrigation water delivered by the second delivery pipe 2 enters the fourth delivery pipe 4 from one end of the fourth delivery pipe 4, and a second part of the irrigation water delivered by the third delivery pipe 3 enters the fourth delivery pipe 4 through the other end of the fourth delivery pipe 4. The first part of the irrigation water is delivered outward through the corresponding second water delivery holes 6 and the first water delivery holes 5, and the second part of the irrigation water is also delivered outward through the corresponding second water delivery holes 6 and the first water delivery holes 5. Since the apertures of several second water delivery holes 6 on each side of the first water delivery hole 5 gradually decrease in the direction from near the first water delivery hole 5 to far from the first water delivery hole 5, combined with the flow resistance brought by the first part of the irrigation water or the operation of the first part of the irrigation water in the fourth delivery pipe 4, the water delivery speeds of several second water delivery holes 6 and the first water delivery holes 5 on each fourth delivery pipe 4 outward are approximately the same. In addition, the inner diameters of several fourth delivery pipes 4 gradually increase in the direction from near the first delivery pipe 1 to far from the first delivery pipe 1. Combined with the flow resistance of the second delivery pipe 2 on the first part of the irrigation water in the second delivery pipe 2 and the flow resistance of the third delivery pipe 3 on the second part of the irrigation water in the third delivery pipe 3, the first part of the irrigation water and the second part of the irrigation water delivered outward by several fourth delivery pipes 4 are approximately the same.

[0031] S5. When the value fed back by the liquid flow sensor 35 in the working state reaches the preset range, stop continuously delivering irrigation water outward through the fourth delivery pipe 4. Use the humidity sensor to measure the irrigation area and replenish water to the areas where the humidity does not reach the standard. The specific process is as follows: Open the corresponding booster pump 34 to continue delivering irrigation water to the third delivery pipe 3 and the second delivery pipe 2. Open the second stop valve 23. The irrigation water is delivered into the pressure equalizing ring 24 through the fifth delivery pipe 22 and then delivered to the water delivery network 25 by the pressure equalizing ring 24 and is delivered to the target area through the corresponding nozzles 26. When the water delivery volume reaches the preset range, stop continuously delivering water to the target area through the nozzles 26. After completing the above steps, the irrigation step before cultivating the greenhouse soil is completed.

[0032] In steps S1 to S5, when the difference between the values fed back by the third pressure sensor 31 and the fourth pressure sensor 33 in the working state reaches the preset range, the filter 32 in the working state needs to be backflushed. At this time, another sixth delivery pipe 30 should be switched to deliver irrigation water. The specific steps are as follows: The seventh stop valve 49, the booster pump 34 and the first regulating valve 36 in the working state are closed and the seventh stop valve 49, the booster pump 34 and the first regulating valve 36 in the working standby state are opened. At this time, the filter 32 originally in the working state is converted into the filter 32 in the state to be cleaned, and the filter 32 originally in the standby state is converted into the filter 32 in the working state. The sixth delivery pipe 30, the seventh stop valve 49, the third pressure sensor 31, the fourth pressure sensor 33, the booster pump 34, the liquid flow sensor 35, the booster pump 34, the liquid flow sensor 35 and the first regulating valve 36 originally in the working state are now in the standby state. The sixth delivery pipe 30, the seventh stop valve 49, the third pressure sensor 31, the fourth pressure sensor 33, the booster pump 34, the liquid flow sensor 35, the booster pump 34, the liquid flow sensor 35 and the first regulating valve 36 originally in the standby state are now in the working state. The filter 32 in the state to be cleaned needs to be backflushed before it can be put into use again, which specifically includes the following steps: The openings of the first regulating valve 36 and the second regulating valve 38 in the working state are adjusted, and the third stop valve 40 adjacent to the sixth delivery pipe 30 in the standby state is opened to increase the output power of the booster pump 34 in the working state. Under the premise that the liquid flow sensor 35 in the working state can still be located within the preset range, the irrigation water filtered by the filter 32 in the working state is partially diverted, and the diverted filtered irrigation water is delivered to the sixth delivery pipe 30 in the standby state through the first backwash connecting pipe 37, and enters the filter 32 from the outlet end of the filter 32 to be cleaned to backwash the filter 32. The backwashed water is discharged into the ditch through the second backwash connecting pipe 39 and the first sewage pipe 41. When the values ​​fed back by the third pressure sensor 31 and the fourth pressure sensor 33 in the standby state reach the preset range, the backwashing is stopped, the second regulating valve 38 is closed, and the opening of the first regulating valve 36 in the working state is adjusted again to restore the output power of the booster pump 34 in the working state. After the above steps are completed, the filter 32 that was originally in the state of being cleaned is converted back into the filter 32 in the standby state.

[0033] Through this embodiment, it is possible to evenly deliver water to the soil in the greenhouse so that the soil in the greenhouse can evenly obtain moisture, solving the problem of inconsistent moisture content of the cultivated soil due to different soil flatness caused by traditional flooding. It also reduces the phenomenon that fertilizers dissolve in the soil and migrate to areas with high humidity due to inconsistent soil humidity during the subsequent fertilizer application stage, thus causing differences in soil water and fertilizer.

[0034] The above-described embodiments are only the preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features, and principles described in the scope of the present invention patent application should be included within the scope of the present invention's patent application.

Claims

1. A water conveyance device for greenhouse irrigation, characterized in that: It includes a first conveying pipe (1), and the first conveying pipe (1) adopts a T-shaped tubular structure composed of a first horizontal pipe and a first vertical pipe. A second conveying pipe (2) is arranged at one end of the first horizontal pipe, and a third conveying pipe (3) is arranged at the other end of the first horizontal pipe. Both the third conveying pipe (3) and the second conveying pipe (2) adopt an L-shaped tubular structure composed of a second horizontal pipe and a second vertical pipe. The second horizontal pipe of the third conveying pipe (3) is parallel to the second horizontal pipe of the second conveying pipe (2). A fourth conveying pipe (4) is arranged on the second horizontal pipe of the third conveying pipe (3) and the second horizontal pipe of the second conveying pipe (2). The number of the fourth conveying pipes (4) is several, and the inner diameters of the several fourth conveying pipes (4) gradually increase along the direction from near the first conveying pipe (1) to far from the first conveying pipe (1). A first water delivery hole (5) is respectively arranged in the middle of the bottom end of each fourth conveying pipe (4), and several second water delivery holes (6) are respectively arranged on the fourth conveying pipes (4) on both sides of the first water delivery hole (5). The aperture diameters of the several second water delivery holes (6) on each side of the first water delivery hole (5) gradually decrease along the direction from near the first water delivery hole (5) to far from the first water delivery hole (5), and the aperture diameter of the first water delivery hole (5) is not less than that of the second water delivery hole (6).

2. The water delivery device for greenhouse irrigation according to claim 1, wherein: A first pressure sensor (7) is arranged on the second vertical pipe of the second conveying pipe (2), and a second pressure sensor (8) is arranged on the third conveying pipe (3) on one side of the first pressure sensor (7). Pipeline sealing devices are respectively arranged on the first conveying pipe (1) and the third conveying pipe (3) and on the first conveying pipe (1) and the second conveying pipe (2). The pipeline sealing device includes a first flange (9) arranged on the first conveying pipe (1), a sealing groove (10) opened on the inner side of the first conveying pipe (1) outside the second conveying pipe (2) or the third conveying pipe (3), a sealing filler (11) and a sealing gland (12) sequentially arranged on the sealing groove (10) along the direction from near the first vertical pipe to far from the first vertical pipe, a second flange (13) arranged on the sealing gland (12) on one side of the first flange (9), and fastening bolts (14) arranged on the first flange (9) and the second flange (13).

3. The water conveyance device for greenhouse irrigation according to claim 2, characterized in that: Hydraulic driving devices are respectively arranged on the first conveying pipe (1) and the third conveying pipe (3) and on the first conveying pipe (1) and the second conveying pipe (2). Each hydraulic driving device includes transmission rods (15) symmetrically arranged on both sides of the second horizontal pipe of the third conveying pipe (3) or the second horizontal pipe of the second conveying pipe (2), and hydraulic cylinders (16) respectively arranged on each transmission rod (15) and the first horizontal pipe.

4. The water delivery device for greenhouse irrigation according to claim 3, wherein: The second horizontal pipes of the third conveying pipe (3) and the second conveying pipe (2) are both installed on the first horizontal pipe of the first conveying pipe (1). Connecting wing plates (17) are respectively arranged on the second horizontal pipes of the third conveying pipe (3) and the second conveying pipe (2). Connecting rods (18) are arranged on several connecting wing plates (17). A limit sliding sleeve (19) is arranged on the first horizontal pipe of the first conveying pipe (1), and the limit sliding sleeve (19) is movably sleeved on the connecting rod (18).

5. The water delivery device for greenhouse irrigation according to claim 1, wherein: The inner diameters of the second horizontal pipe of the third conveying pipe (3) near one end of the first conveying pipe (1) and the second horizontal pipe of the second conveying pipe (2) near one end of the first conveying pipe (1) both gradually increase in the direction from near the first longitudinal pipe to far from the first longitudinal pipe. Reducing conveying pipes (20) are respectively arranged between each fourth conveying pipe (4) and the third conveying pipe (3) and between each fourth conveying pipe (4) and the second conveying pipe (2). Each reducing conveying pipe (20) sequentially includes a first straight pipe section, a reducing section, and a second straight pipe section in the direction from near the fourth conveying pipe (4) to far from the fourth conveying pipe (4). First stop valves (21) are respectively arranged on each of the second straight pipe sections. The first straight pipe section of each reducing conveying pipe (20) is connected to the adjacent fourth conveying pipe (4).

6. The water conveyance device for greenhouse irrigation according to claim 1, wherein: Several fifth conveying pipes (22) are sequentially arranged at intervals on the second horizontal pipe of the third conveying pipe (3) and the second horizontal pipe of the third conveying pipe (3) in the direction from near the first conveying pipe (1) to far from the first conveying pipe (1). Second stop valves (23) are respectively arranged on each of the fifth conveying pipes (22). Pressure rings (24) are arranged on several fifth conveying pipes (22). A water delivery network (25) is arranged inside the pressure ring (24). Several spray nozzles (26) are evenly arranged on the water delivery network (25). Spray nozzle connecting pipes (27) are respectively arranged between each spray nozzle (26) and the water delivery network (25). Electromagnetic valves (28) are respectively arranged on each spray nozzle connecting pipe (27). The water delivery network (25) adopts a mesh structure composed of several third longitudinal pipes and several third horizontal pipes intersecting vertically and horizontally.

7. The water conveyance device for greenhouse irrigation according to claim 1, characterized in that: A buffer tank (29) is provided at the inlet end of the first longitudinal pipe of the first conveying pipe (1). A sixth conveying pipe (30) is provided between the buffer tank (29) and the first conveying pipe (1). The number of the sixth conveying pipes (30) is two. Along the direction from near the buffer tank (29) to far from the buffer tank (29), a seventh stop valve (49), a third pressure sensor (31), a filter (32), a fourth pressure sensor (33), a booster pump (34), a liquid flow sensor (35) and a first regulating valve (36) are arranged on one side of each sixth conveying pipe (30). The sixth conveying pipes (30) between the two booster pumps (34) and the liquid flow sensor (35) are connected through a first backflush connecting pipe (37). A second regulating valve (38) is arranged on the first backflush connecting pipe (37). The sixth conveying pipes (30) between the two third pressure sensors (31) and the seventh stop valve (49) are connected through a second backflush connecting pipe (39). Two third stop valves (40) are arranged on the second backflush connecting pipe (39). The second backflush connecting pipe (39) between the two third stop valves (40) is connected through a first sewage discharge pipe (41). A turbidity detector (42) is arranged on the first sewage discharge pipe (41).

8. The water delivery device for greenhouse irrigation according to claim 7, characterized in that: A liquid level sensor (43) is arranged on the buffer tank (29). A seventh conveying pipe (44) and an exhaust valve (45) are arranged at the top of the buffer tank (29). An eighth conveying pipe (46) is arranged on the two sixth conveying pipes (30) and the buffer tank (29). The inlet end of the eighth conveying pipe (46) is communicated with the middle part of the buffer tank (29). A second sewage discharge pipe (47) is arranged at the bottom of the buffer tank (29). A sixth stop valve (48) is arranged on the second sewage discharge pipe (47).

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