A field brackish water irrigation system and control method

Abstract

The application belongs to the field of irrigation equipment, and particularly relates to a field brackish water irrigation system and a control method, which comprises a fresh water source and a salt water source, the fresh water source and the salt water source are connected with a water inlet pipe of a filtering device through a water pump, a water outlet pipe of the filtering device is connected with a water mixing tank, the water mixing tank is further connected with a water storage tank through a water pump, and an output end of the water storage tank is connected with a drip irrigation pipe which is buried underground in a field. The application adopts the form of the water mixing tank cooperating with the water storage tank, forms the separate preparation and storage of the brackish water, avoids the problem of the salt content fluctuation of the brackish water for irrigation caused by direct mixing, effectively avoids the use of the super-salinity brackish water, and improves the irrigation safety.

Description

Technical Field

[0001] This invention belongs to the field of irrigation equipment, specifically relating to a field brackish water irrigation system and control method. Background Technology

[0002] Saline-alkali land results in high surface salinity. In order to ensure the growth of crops, in addition to selecting salt-tolerant crop varieties, there are also certain requirements for irrigation water to prevent the surface salinity from rising further.

[0003] Due to rainwater leaching, shallow groundwater usually has a high salt content. In order to ensure smooth irrigation, it is necessary to reduce its salt content. The current common practice is to use shallow wells or surface water in combination with deep wells to mix brackish water with deep fresh water to form slightly saline water with lower salinity. This slightly saline water is then used for irrigation. In order to further reduce water consumption, reduce evaporation, and slow down the rate of salt return, drip irrigation pipes can be buried in the shallow ground in the field for irrigation.

[0004] Because different water sources need to be mixed, directly connecting two water sources results in poor mixing and difficulty in controlling salinity. In addition, since brackish water comes from shallow wells or surface water, it contains not only salt but also a lot of soil, sand, and other debris, which can easily clog the drip irrigation pipes. Summary of the Invention

[0005] In order to solve the problems existing in the prior art, the present invention provides a field brackish water irrigation system that can provide stable brackish water for irrigation and reduce drip irrigation pipe clogging.

[0006] The specific technical solution adopted in this invention is as follows:

[0007] A field brackish water irrigation system includes a fresh water source and a brackish water source. The fresh water source and the brackish water source are connected to an inlet pipe with a filter device via a water pump. The outlet pipe of the filter device is connected to a mixing tank. The mixing tank is also connected to a storage tank via a water pump. The output end of the storage tank is connected to a drip irrigation pipe buried underground in the field via a water pump.

[0008] The filtration device is set up in one set each between the fresh water source, the saline water source and the mixing tank. The filtration device includes a spiral filter and a secondary filter connected in series. The input end of the spiral filter is the water inlet pipe of the filtration device, and the output end of the secondary filter is the water outlet pipe of the filtration device.

[0009] The secondary filtration device includes a displacement wheel and a clamping device. The rim of the displacement wheel is provided with multiple sleeves, and a filter element tube is installed inside each sleeve. The clamping device includes a telescopic corrugated pipe, a first clamping flange, a second clamping flange, and a telescopic cylinder. The telescopic corrugated pipe is connected between the inlet pipe of the mixing tank and the first clamping flange. The first clamping flange and the second clamping flange are respectively located on both sides of the filter element tube. The telescopic cylinder pushes the first clamping flange to squeeze the filter element tube, pressing and fixing the filter element tube to the second clamping flange on the other side. The filter element tube is clamped and sealed by the first clamping flange and the second clamping flange.

[0010] The secondary filtration device further includes a rotary wheel mechanism, which comprises a base, a slide rail assembly, a swing rod, and a rake rod. The slide rail assembly is mounted on the base and includes a first slide rail and a second slide rail. A first slider is mounted on the first slide rail, and a second slider is mounted on the second slide rail. The first and second slide rails are set at right angles. The swing rod is a right-angle structure, with its right-angle end hinged to the base. Both ends of the swing rod are hinged to the first and second sliders, respectively. The first slider is fixedly connected to a first clamping flange. The end of the rake rod is hinged with a herringbone-shaped rake claw, which forms a hook-and-loop engagement with a sleeve. The first slider swings the swing rod by means of the movement of the first clamping flange. The swing rod drives the rake rod to move relative to the sleeve on the displacement wheel. The displacement wheel has a degree of freedom of rotation relative to the rotary wheel mechanism by means of a rotating shaft passing through its wheel core.

[0011] It also includes methods for controlling the irrigation system, the steps of which are as follows.

[0012] S1. Before irrigation, mix and store water, connect fresh water source and saline water source, pour a volume of brackish water of V1 into the mixing tank, then stop pouring brackish water and pour fresh water in, measure the salinity in the mixing tank, when the required salinity is reached, stop pouring fresh water, measure the volume of water in the mixing tank at this time, which is V3, then the volume of fresh water injected is V2 = V3 - V1, where V3 is less than the volume of the mixing tank V0.

[0013] S2. Calculate the required volume of fresh water and brackish water when the mixing tank is full.

[0014] The volume of brackish water is (V0 / V3)×V1, and the volume of fresh water is (V0 / V3)×V2;

[0015] S3. According to the water volume calculated in step 2, first inject fresh water. After the fresh water injection is completed, inject brackish water. While injecting brackish water, monitor the salinity in the mixing tank. If the salinity meets the standard, stop injecting brackish water. Otherwise, inject brackish water according to the calculated water volume to form slightly brackish water.

[0016] S4. Transfer the slightly saline water mixed in the mixing tank into the storage tank, and draw water from the storage tank for irrigation.

[0017] In step S4, the slightly saline water is left to stand in the storage tank for at least 48 hours. Before the irrigation water is used, the sediment is manually released through a sedimentation hopper located at the bottom of the storage tank.

[0018] At the end of irrigation, the mixing tank is connected to a fresh water source and filled with fresh water. The fresh water in the mixing tank is then transferred to the storage tank by a water pump to reduce the salinity of the residual liquid in the storage tank. The fresh water is then pumped into the drip irrigation pipes by a water pump.

[0019] The beneficial effects of this invention are:

[0020] This invention employs a mixing tank combined with a storage tank, enabling separate preparation and storage of brackish water. This avoids the problem of salinity fluctuations in the brackish water used for irrigation caused by direct mixing, effectively preventing the use of excessively saline brackish water and improving irrigation safety. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the replacement roulette wheel;

[0023] Figure 3 for Figure 2 A schematic diagram of the rotating wheel mechanism in the left view;

[0024] Figure 4 This is a schematic diagram showing the fit between the filter element tube and the sleeve on the replacement wheel.

[0025] In the attached diagram, 1. Mixing tank, 2. Storage tank, 3. Drip irrigation pipe, 4. Replacement wheel, 5. Sleeve, 6. Filter tube, 7. Telescopic corrugated pipe, 8. First tightening flange, 9. Second tightening flange, 10. Telescopic cylinder, 11. Base, 12. Swing rod, 13. Rake rod, 14. First slide rail, 15. Second slide rail, 16. First slider, 17. Second slider, 18. Rake claw, 19. Rotating shaft. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0027] Specific implementation examples Figure 1 As shown, the present invention is a field brackish water irrigation system, including a fresh water source and a brackish water source. The fresh water source and the brackish water source are connected to the inlet pipe of a filter device via a water pump. The outlet pipe of the filter device is connected to a mixing tank 1. The mixing tank 1 is also connected to a storage tank 2 via a water pump. The output end of the storage tank 2 is connected to a drip irrigation pipe 3 buried underground in the field via a water pump.

[0028] The present invention uses a mixing tank 1 and a storage tank 2 to separately prepare and store brackish water, avoiding the problem of salinity fluctuations in the brackish water used for irrigation caused by direct mixing. This effectively avoids the use of brackish water with excessive salinity, improves irrigation safety, and allows the prepared brackish water to stand by the storage tank 2, thus enabling further purification.

[0029] The bottom of the water storage tank 2 is a conical structure and is equipped with a drain valve. When it is necessary to drain the sediment at the bottom, the drain valve can be manually operated to drain the sediment at the bottom of the water storage tank 2.

[0030] Furthermore, such as Figure 1 As shown, the filtration device is set up in one set each between the fresh water source, the saline water source and the mixing tank 1. The filtration device includes a spiral filter and a secondary filter connected in series. The input end of the spiral filter is the water inlet pipe of the filtration device, and the output end of the secondary filter is the water outlet pipe of the filtration device.

[0031] A spiral filter allows for the initial purification of incoming water, removing larger particles of sediment and impurities, thus reducing the need for secondary filters.

[0032] Furthermore, the secondary filtration device includes a displacement wheel 4 and a clamping device. The rim of the displacement wheel 4 is provided with multiple sleeves 5, and a filter element tube 6 is fitted inside the sleeves 5. The clamping device includes a telescopic corrugated pipe 7, a first clamping flange 8, a second clamping flange 9, and a telescopic cylinder 10. The telescopic corrugated pipe 7 is connected between the water inlet pipe of the mixing tank 1 and the first clamping flange 8. The first clamping flange 8 and the second clamping flange 9 are respectively located on both sides of the filter element tube 6. The telescopic cylinder 10 pushes the first clamping flange 8 to squeeze the filter element tube 6, pressing and fixing the filter element tube 6 with the second clamping flange 9 on the other side, thereby clamping and sealing the filter element tube 6 with the help of the first clamping flange 8 and the second clamping flange 9.

[0033] The filter tube 6 is a cylindrical structure with an inlet and an outlet at each end of the tube, and a filter screen is installed between the inlet and the outlet.

[0034] When the secondary filtration device is in use, the filter element tube 6 is inserted into the sleeve 5. The first tightening flange 8 is pushed by the telescopic cylinder 10 to move one end of the filter element tube 6 so that the filter element tube 6 moves and the other end touches the second tightening flange 9. The first tightening flange 8 and the second tightening flange 9 are respectively provided with sealing grooves that are adapted to the shape of the end of the filter element tube 6. By clamping the first tightening flange 8 and the second tightening flange 9, the filter element tube 6 is connected to the inlet and outlet of the secondary filtration device.

[0035] Furthermore, such as Figure 3As shown, the secondary filtration device further includes a rotary mechanism, which includes a base 11, a slide rail assembly, a swing rod 12, and a rake rod 13. The slide rail assembly is mounted on the base 11 and includes a first slide rail 14 and a second slide rail 15. A first slider 16 is mounted on the first slide rail 14, and a second slider 17 is mounted on the second slide rail 15. The first slide rail 14 and the second slide rail 15 are arranged at right angles. The swing rod 12 has a right-angle structure, and the right-angle end of the swing rod 12 is hinged to the base 11. The two ends of the moving rod 12 are hinged to the first slider 16 and the second slider 17, respectively. The first slider 16 is fixedly connected to the first clamping flange 8. The end of the rake rod 13 is hinged with a "V"-shaped rake claw 18, which forms a hook engagement with the sleeve 5. The first slider 16 causes the swing rod 12 to swing by moving the first clamping flange 8. The swing rod 12 drives the rake rod 13 to move relative to the sleeve 5 on the replacement wheel 4. The replacement wheel 4 has a degree of freedom of rotation relative to the wheel mechanism by means of the rotating shaft 19 passing through its wheel core. The rotating shaft 19 is in frictional engagement with the replacement wheel 4, and the damping between the rotating shaft 19 and the replacement wheel 4 prevents the replacement wheel 4 from rotating freely.

[0036] The first slider 16 and the second slider 17 are respectively provided with protruding hinge posts, and the end of the swing rod is provided with an elongated hole to form a hinged engagement with the hinge posts of the first slider 16 and the second slider 17.

[0037] A return spring is also provided between the filter element tube 6 and the sleeve 5, so that the filter element tube 6 can be pulled out from the second tightening flange 9 after the filter element tube 6 is loosened.

[0038] The filter element of the secondary filtration device needs to be replaced regularly due to the obstruction of mud and sand. To reduce the workload, the filter element tube 6 can be replaced automatically through the rotating wheel mechanism.

[0039] First, when replacement is needed, the telescopic cylinder 10 moves backward, causing the first clamping flange 8 to retract. The first clamping flange 8 and the second clamping flange 9 loosen the filter element tube 6. The first slider 16 retracts synchronously with the movement of the first clamping flange 8. Figure 3 As shown, the first slider 16 drives the swing rod 12 to rotate, wherein the direction of the second slide rail 15 is perpendicular to the rotation direction of the replacement wheel 4. The swing of the swing rod 12 causes the second sliding block to move down, causing the rake rod 13 to move down. The rake claw 18 hinged on the rake rod 13 is inserted into a sleeve 5 of the replacement wheel 4. As the rake rod 13 continues to move down, the rake claw 18 pulls the replacement wheel 4, and the used filter tube 6 on the replacement wheel 4 rotates down. The spare filter tube 6 on the upper side rotates to the inlet and outlet water pipe axis of the secondary filtration device. Then, the telescopic cylinder 10 extends, driving the first clamping flange 8 forward to clamp the spare filter tube 6. The first slider 16 moves forward, and the second slider 17 moves up, driving the rake rod 13 to move up. Since the rake claw 18 is as shown... Figure 2 The rake is shaped like a V-shape and hinged to the rake rod 13. When the rake claw 18 moves upward, the rake claw 18 cannot grip the sleeve 5, thereby achieving the reset of the rake rod 13.

[0040] The above process is driven solely by the telescopic cylinder 10, making it simple to control and requiring no human intervention. This reduces maintenance time and helps improve irrigation efficiency.

[0041] The present invention also includes a method for controlling an irrigation system, the steps of which are as follows:

[0042] S1. Before irrigation, mix and store water, connect fresh water source and saline water source, inject brackish water with a volume of V1 into mixing tank 1, then stop injecting brackish water and inject fresh water, measure the salinity in mixing tank 1, when the required salinity is reached, stop injecting fresh water, measure the volume of water in mixing tank 1 at this time, and the volume of water is V3. Then the volume of fresh water injected is V2 = V3 - V1, where V3 is less than the volume V0 of mixing tank 1.

[0043] S2. Calculate the required amount of fresh water and brackish water when mixing tank 1 is full.

[0044] The volume of brackish water is (V0 / V3)×V1, and the volume of fresh water is (V0 / V3)×V2;

[0045] S3. According to the water volume calculated in step 2, first inject fresh water. After the fresh water injection is completed, inject brackish water. While injecting brackish water, monitor the salinity in mixing tank 1. If the salinity meets the standard, stop injecting brackish water. Otherwise, inject brackish water according to the calculated water volume to form slightly brackish water.

[0046] S4. Transfer the slightly saline water mixed in the mixing tank 1 into the storage tank 2, and draw water from the storage tank 2 for irrigation.

[0047] In step S4, the slightly saline water is left to stand in the water storage tank 2 for at least 48 hours. Before the irrigation water is used, the sediment is manually released through the sedimentation hopper at the bottom of the water storage tank 2.

[0048] At the end of irrigation, the mixing tank 1 is connected to a fresh water source and filled with fresh water. The fresh water in the mixing tank 1 is then transferred to the storage tank 2 by a water pump to reduce the salinity of the residual liquid in the storage tank 2. The fresh water is then pumped into the drip irrigation pipe 3 to reduce the salinity of the stored water and reduce equipment corrosion and crystallization blockage.

[0049] In step S3, since the fresh water is extracted from deep underground and has little salinity fluctuation, by adding fresh water in advance and then adding brackish water later, the salinity of the blended slightly brackish water is prevented from exceeding the standard due to subsequent changes in the concentration of brackish water.

Claims

1. A field brackish water irrigation system, comprising a freshwater source and a brackish water source, wherein the freshwater source and the brackish water source are connected to an inlet pipe equipped with a filter via a water pump, characterized in that: The outlet pipe of the filter device is connected to a mixing tank (1), and the mixing tank (1) is also connected to a water storage tank (2) by means of a water pump. The output end of the water storage tank (2) is connected to a drip irrigation pipe (3) buried in the field by means of a water pump. The filter device is set up in one set between the fresh water source, the saline water source and the mixing tank (1). The filter device includes a spiral filter and a secondary filter connected in series. The input end of the spiral filter is the water inlet pipe of the filter device, and the output end of the secondary filter is the water outlet pipe of the filter device. The secondary filter includes a displacement wheel (4) and a clamping device. Multiple sleeves (5) are provided on the rim of the displacement wheel (4). A filter element tube (6) is installed inside the sleeve (5). The clamping device includes a telescopic corrugated pipe (7), a first clamping flange (8), a second clamping flange (9), and a telescopic cylinder (10). The telescopic corrugated pipe (7) is connected between the water inlet pipe of the mixing tank (1) and the first clamping flange (8). The first clamping flange (8) and the second clamping flange (9) are respectively located on both sides of the filter element tube (6). The telescopic cylinder (10) pushes the first clamping flange (8) to squeeze the filter element tube (6) and presses and fixes the filter element tube (6) with the second clamping flange (9) on the other side. The filter element tube (6) is clamped and sealed by the first clamping flange (8) and the second clamping flange (9). The secondary filter further includes a rotary wheel mechanism, which includes a base (11), a slide rail assembly, a swing rod (12), and a rake rod (13). The slide rail assembly is mounted on the base (11) and includes a first slide rail (14) and a second slide rail (15). A first slider (16) is mounted on the first slide rail (14), and a second slider (17) is mounted on the second slide rail (15). The first slide rail (14) and the second slide rail (15) are set at right angles. The swing rod (12) has a right-angle structure, and the right-angle end of the swing rod (12) is hinged to the base (11). The two ends of the rake (13) are respectively hinged to the first slider (16) and the second slider (17). The first slider (16) is fixedly connected to the first clamping flange (8). The end of the rake (13) is hinged with a "human" shaped rake claw (18). The rake claw (18) and the sleeve (5) form a hook engagement. The first slider (16) swings the swing rod (12) by means of the movement of the first clamping flange (8). The swing rod (12) drives the rake (13) to move relative to the sleeve (5) on the replacement wheel (4). The replacement wheel (4) has a degree of freedom of rotation relative to the wheel mechanism by means of the rotating shaft (19) passing through its wheel core.

2. A method for controlling brackish water irrigation in fields, utilizing the irrigation system as described in claim 1, characterized in that: The steps are as follows: S1. Before irrigation, mix and store water, connect fresh water source and saline water source, inject brackish water with a volume of V1 into the mixing tank (1), then stop injecting brackish water and inject fresh water, measure the salinity in the mixing tank (1), when the required salinity is reached, stop injecting fresh water, measure the volume of water in the mixing tank (1) at this time, and the volume of fresh water is V3. Then the volume of fresh water injected is V2=V3-V1, where V3 is less than the volume V0 of the mixing tank (1). S2. Calculate the amount of fresh water and brackish water required when the mixing tank (1) is full. The volume of brackish water is (V0 / V3)×V1, and the volume of fresh water is (V0 / V3)×V2; S3. According to the water volume calculated in step 2, first inject fresh water, and after the fresh water injection is completed, inject brackish water. While injecting brackish water, monitor the salinity in the mixing tank (1). If the salinity meets the standard, stop injecting brackish water. Otherwise, inject brackish water according to the calculated water volume to form slightly saline water. S4. The slightly saline water mixed in the mixing tank (1) is sent into the water storage tank (2), and water is taken from the water storage tank (2) for irrigation.

3. The method for controlling brackish water irrigation in the field according to claim 2, characterized in that: In step S4, the slightly saline water is left to stand in the water storage tank (2) for at least 48 hours. Before the irrigation water is used, the sediment is manually released through the sedimentation hopper at the bottom of the water storage tank (2).

4. The method for controlling brackish water irrigation in the field according to claim 2, characterized in that: At the end of irrigation, the mixing tank (1) is connected to a fresh water source and filled with fresh water. The fresh water in the mixing tank (1) is transferred to the storage tank (2) by a water pump to reduce the salinity of the residual liquid in the storage tank (2) and pumped into the drip irrigation pipe (3) by a water pump.

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