Water intake system

Abstract

The application provides a water taking system and relates to the technical field of irrigation. The water taking system comprises a control device and a water lifting device. The control device controls the water lifting device to extract fresh water and salt water according to a preset water quantity ratio, so that the water lifting device can extract fresh water and salt water respectively according to the preset water quantity ratio, and then the fresh water and the salt water are mixed and delivered to a water supply pipeline. Therefore, the mixing of fresh water and salt water can be completed by the water lifting device, only one well needs to be drilled, and a ground stirring mixing pool does not need to be arranged, so that the investment cost of the irrigation system is greatly reduced.

Description

Technical Field

[0001] This application relates to the field of irrigation technology, and more specifically, to a water intake system. Background Technology

[0002] For regions with extremely scarce surface water resources, developing and utilizing shallow saline water resources for irrigation has become an important measure to solve the water crisis in these areas. For most crops, irrigation with saline water exceeding 3 g / L can inhibit crop growth and easily lead to soil salinization, which is detrimental to the sustainable development of agriculture and ecology. Therefore, the technology of mixing shallow groundwater with deep freshwater to prepare slightly saline water at a concentration below the tolerance threshold of the irrigated crops and vegetation has been widely adopted. This technology can provide technical support for reducing regional groundwater extraction and achieving regional water resource balance.

[0003] Typically, saline aquifers are located on the surface, while freshwater aquifers are located at greater depths. To achieve the mixing of saline and freshwater, a saline well and a freshwater well are usually drilled in close proximity, with pumps and other facilities installed in both wells. The freshwater and saline water are pumped from their respective aquifers and collected in a mixing tank to be mixed. After measuring the salinity or conductivity of the mixed water, it is determined whether the prepared slightly saline solution meets irrigation requirements. If the required salinity is not met, repeated adjustments are made by adding either saline or freshwater until the salinity of the mixed water reaches the desired level. This method has the following drawbacks: 1) To achieve mixed irrigation of saline and freshwater, at least two wells need to be drilled in the same irrigation area, significantly increasing the investment in the irrigation system; 2) The mixing tank, located on the ground, not only occupies land but also requires investment in construction, further reducing the economic and ecological benefits of the irrigation system. Summary of the Invention

[0004] The purpose of this application is to provide a water intake system to improve the problem of high investment costs in existing irrigation systems.

[0005] In a first aspect, embodiments of this application provide a water intake system, the water intake system comprising: a water lifting device and a control device;

[0006] The control device is connected to the water lifting device and is used to control the water lifting device to extract fresh water and salt water according to a preset water volume ratio.

[0007] The water extraction device is used to extract fresh water and salt water according to the preset water volume ratio, and then mix the fresh water and salt water according to the preset water volume ratio and deliver them to the water supply pipeline.

[0008] In the above process, the water lifting device is controlled by the control device to extract fresh water and saline water according to the preset water volume ratio. This allows the water lifting device to extract fresh water and saline water separately according to the preset water volume ratio. Then, the fresh water and saline water are mixed and transported to the water supply pipeline. Thus, the mixing of fresh water and saline water can be completed by the water lifting device. Only one well is needed, and there is no need to set up a ground mixing tank, which greatly reduces the investment cost of the irrigation system.

[0009] Optionally, the water lifting device includes:

[0010] Freshwater extraction devices, isolation devices, saline water extraction devices, and mixed water extraction devices;

[0011] The freshwater extraction device is connected to the isolation device and the mixing extraction device, and is used to extract a first amount of freshwater.

[0012] The saline water extraction device is connected to the mixing water extraction device and is used to extract a second amount of saline water, wherein the ratio of the first amount of water to the second amount of water is the preset water volume ratio.

[0013] The isolation device is used to isolate the freshwater layer and the saltwater layer;

[0014] The mixing and extraction device is used to mix the extracted fresh water and salt water and then transport them to the water supply pipeline.

[0015] In the above process, by isolating the freshwater layer and the saltwater layer through the isolation device, the freshwater extraction device and the saltwater extraction device can extract relatively pure freshwater and saltwater respectively, so that the freshwater and saltwater can be more accurately mixed when they flow into the mixing extraction device.

[0016] Optionally, the isolation device includes:

[0017] First flange, second flange, and spacer;

[0018] The isolation element is disposed between the first flange and the second flange, which are positioned opposite each other.

[0019] In the above implementation process, the isolation function of the isolation device can be easily achieved through the flange and the isolation component, which is less costly.

[0020] Optionally, the first flange includes a first connecting hole, a first water passage hole, and a first cable hole; the second flange includes a second connecting hole, a second water passage hole, and a second cable hole; and the isolator includes a third connecting hole, a third water passage hole, and a third cable hole.

[0021] The first connecting hole, the second connecting hole, and the third connecting hole are in corresponding positions, and the first flange, the second flange, and the isolation member are connected through the connecting holes;

[0022] The first cable hole, the second cable hole, and the third cable hole are positioned correspondingly to provide a channel for the cable connecting the control device and the freshwater extraction device.

[0023] The first water passage, the second water passage, and the third water passage are positioned correspondingly to provide a channel for the freshwater lifting pipe that transports freshwater.

[0024] In the above implementation process, the isolation device provides a cable channel to facilitate the connection between the control device and the water lifting device, and the isolation device provides a water passage channel to facilitate the transportation of fresh water while isolating fresh water and salt water.

[0025] Optionally, a first water-stop plate is provided in the cable hole of the first flange, and a second water-stop plate is provided in the cable hole of the second flange;

[0026] The first water-stop plate includes a first water-stop plate frame and a first cylindrical structure;

[0027] The second water-stop plate includes a second water-stop plate frame and a second cylindrical structure;

[0028] The first waterstop plate frame includes a first cylindrical body and a raised edge formed on the outer peripheral surface of one end of the first cylindrical body. The first cylindrical structure has an annular groove corresponding to the first cylindrical body.

[0029] The second water-stop plate frame includes a second cylindrical body and a raised edge formed on the outer peripheral surface of one end of the second cylindrical body. The second cylindrical structure has an annular groove corresponding to the second cylindrical body.

[0030] In the above process, by setting a water-stop plate, the cable hole can be sealed to better isolate fresh water and salt water.

[0031] Optionally, the freshwater extraction device includes:

[0032] Freshwater pump and freshwater lifting pipe;

[0033] The freshwater pump is connected to the freshwater extraction pipe and is used to extract freshwater from the freshwater layer and transport the extracted freshwater to the mixing extraction device through the freshwater extraction pipe.

[0034] In the above process, fresh water extraction can be completed by setting up a simple fresh water extraction device.

[0035] Optionally, the saline water extraction device includes:

[0036] Saltwater pump and saltwater lifting pipe;

[0037] The saline water pump is connected to the saline water extraction pipe and is used to extract saline water from the saline layer and transport the extracted saline water to the mixing extraction device through the saline water extraction pipe.

[0038] In the above process, the extraction of salt water can be completed by setting up a simple salt water extraction device.

[0039] Optionally, the mixing and water extraction device includes:

[0040] Mixed water lifting pipe, check valve and gate valve;

[0041] The check valve and the gate valve are installed on the mixing water lifting pipe;

[0042] The mixing and lifting pipe is used to transport the mixed fresh water and salt water to the water supply pipe;

[0043] The gate valve is used to control the amount of fresh and salt water conveyed by the mixing water lifting pipe.

[0044] In the above process, the amount of water extracted can be controlled by the mixing water extraction device to avoid excessive extraction and waste.

[0045] Optionally, the control device includes:

[0046] Conductivity-temperature probes, electromagnetic flowmeters, remote pressure gauges, frequency converters, and central controllers;

[0047] The conductivity-temperature probe is installed on the freshwater extraction device, the saline water extraction device, and the mixed water extraction device, and is connected to the central controller via a cable to detect the conductivity and temperature of the freshwater and saline water.

[0048] The electromagnetic flowmeter is installed on the freshwater extraction device and the saline water extraction device, and is connected to the central controller via a wire to detect the extraction volume of freshwater and saline water.

[0049] The remote pressure gauge is installed on the mixing and water extraction device and is used to detect the outlet pressure of the mixing and water extraction device;

[0050] The frequency converter is connected to the freshwater extraction device and the saline water extraction device, and is used to control the extraction volume of the freshwater extraction device and the saline water extraction device.

[0051] The central controller is used to adjust the power of the frequency converter according to the preset water volume ratio, so that the freshwater extraction device and the saline water extraction device extract freshwater and saline water according to the preset water volume ratio.

[0052] In the above process, by detecting the conductivity and temperature of fresh water and saline water, the ratio of fresh water to saline water can be calculated, and the extraction volume of fresh water and saline water can be controlled by frequency conversion equipment. This allows the saline water and fresh water to be extracted on demand in the water lifting device and accurately mixed according to the preset water volume ratio. This will prevent the fresh water and saline water from being in an unsuitable ratio after being lifted to the ground, greatly reducing the difficulty of irrigation control and reducing resource waste.

[0053] Optionally, the central controller is configured to calculate the salinity of the fresh water and the salinity of the salt water based on the conductivity and temperature of the fresh water and salt water detected by the conductivity-temperature probe, respectively.

[0054] The central controller is used to calculate the current water volume ratio of fresh water and salt water extraction based on the salinity of fresh water and salt water.

[0055] The central controller is used to control the frequency converter to regulate the water extraction volume of the freshwater extraction device and the saline water extraction device according to the current water volume ratio and the preset water volume ratio.

[0056] In the above implementation process, the extraction ratio of saline water and fresh water can be calculated through the central controller, thereby adjusting the extraction ratio of saline water and fresh water to achieve precise mixing of saline water and fresh water, so as to avoid the situation of unsuitable mixing ratio.

[0057] Optionally, the water intake system further includes:

[0058] A well assembly for housing the water lifting device;

[0059] The well equipment includes:

[0060] Well casing and first filter pipe, second filter pipe;

[0061] The water lifting device is installed inside the well pipe, and the well pipe is used to isolate the water lifting device from the external environment;

[0062] The first filter pipe is disposed in the freshwater layer and on the well pipe, and is used to filter freshwater from the external environment into the well pipe;

[0063] The second filter pipe is located in the saline layer and is installed on the well pipe to filter saline water from the external environment into the well pipe.

[0064] In the above implementation process, by setting up a well device, the water pumping device can be isolated from the external environment, so as to filter fresh water and salt water in the external environment into the well pipe, thereby extracting purer fresh water and salt water and avoiding the problem of water quality being affected by other impurities.

[0065] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing embodiments of this application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0066] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0067] Figure 1 This is a first structural schematic diagram of a water intake system provided in an embodiment of this application;

[0068] Figure 2 This is a schematic diagram of a second structure of a water intake system provided in an embodiment of this application;

[0069] Figure 3 This is a schematic diagram of the structure of a well-drilling device provided in an embodiment of this application;

[0070] Figure 4 This is a detailed structural diagram of a water intake system provided in an embodiment of this application;

[0071] Figure 5 This is a schematic diagram of a freshwater extraction device provided in an embodiment of this application;

[0072] Figure 6 This is a schematic diagram of the structure of an isolation device provided in an embodiment of this application;

[0073] Figure 7 This is a schematic diagram of the installation structure of an isolation device provided in an embodiment of this application;

[0074] Figure 8 This is a schematic diagram of the structure of a waterstop plate provided in an embodiment of this application;

[0075] Figure 9 This is a schematic diagram of flow regulation provided in an embodiment of this application.

[0076] Icons: 100 - Water intake system; 110 - Control device; 111 - Conductivity-temperature probe; 112 - Electromagnetic flowmeter; 113 - Remote pressure gauge; 114 - Variable frequency drive; 115 - Central controller; 120 - Water lifting device; 122 - Freshwater lifting device; 1222 - Freshwater lifting pump; 1224 - Freshwater lifting pipe; 124 - Isolation device; 1241 - First flange; 12412 - First connection hole; 12414 - First water passage hole; 12416 - First cable hole; 1242 - Second flange; 12422 - Second connection hole; 12424 - Second water passage hole; 12426 - Second cable hole; 1243 - Isolator; 12432 - Third connecting hole; 12434 - Third water passage hole; 12436 - Third cable hole; 1244 - First waterstop plate frame; 1246 - First cylindrical structure; 126 - Saltwater lifting device; 1262 - Saltwater lifting pump; 1264 - Saltwater lifting pipe; 128 - Mixing lifting device; 1282 - Mixing lifting pipe; 1284 - Check valve; 1286 - Gate valve; 130 - Well equipment; 131 - Well shaft; 1311 - Well platform; 132 - Well pipe; 134 - First filter pipe; 136 - Second filter pipe. Detailed Implementation

[0077] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. The components of the embodiments of this invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0078] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0079] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0080] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0081] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0082] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0083] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a water intake system 100 provided in an embodiment of this application. The water intake system 100 includes a water lifting device 120 and a control device 110. The control device 110 can be used to control the water lifting device 120 to extract fresh water and saline water according to a preset water volume ratio. The water lifting device 120 can be used to extract fresh water and saline water respectively according to the preset water volume ratio, and then mix the extracted fresh water and saline water according to the preset water volume ratio and transport them to the water supply pipeline. In this way, the water intake system 100 can simultaneously extract saline water and fresh water, without the need to use fresh water wells to extract fresh water and saline water wells to extract saline water. Only one well is needed, and there is no need to set up a ground mixing tank, which greatly reduces the investment cost of the irrigation system.

[0084] In some embodiments, the control device 110 may be a processor, which may be an integrated circuit chip with signal processing capabilities. The processor may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor may be a microprocessor or any conventional processor.

[0085] In some implementations, such as Figure 2 As shown, in order to facilitate the deployment of the water lifting device 120, the water intake system 100 may also include a well device 130. The well device 130 is used to accommodate the water lifting device 120. The well device 130 can be understood as an external environmental device deployed during well drilling. The water lifting device 120 can be cylindrical and can be vertically placed inside the well device 130 to facilitate the extraction of deep fresh water and shallow saline water.

[0086] The well device 130 isolates the water lifting device 120 from the external environment, allowing for the extraction of purer fresh and saline water and preventing the mixing of impurities (such as soil) that could affect water quality. The well device 130 can be a hollow cylinder, or other hollow shapes, with the cavity housing the water lifting device 120. In the irrigation system, a well is first drilled to a certain depth, and then a well casing 131 (i.e., a hollow cylinder) is installed. This well casing 131 is a structure used to extract groundwater. It can be cylindrical, and its depth and diameter can be determined based on a pre-surveyed assessment of the groundwater volume and quality. A well platform 1311 can be installed at the upper end of the well casing 131, primarily to support the water lifting device 120. The well platform 1311 can be constructed of concrete or other materials meeting strength requirements.

[0087] The well device 130 can be installed inside the well shaft 131, so that the water pumping device 120 can extract fresh water and salt water. Since the fresh water layer and the salt water layer are located at different depths, when the water pumping device 120 is installed inside the well device 130, it should meet the needs of the different depths of the fresh water layer and the salt water layer, so as to realize the separate extraction of fresh water and salt water.

[0088] In some implementations, such as Figure 3 As shown, the well equipment 130 may include a well pipe 132, a first filter pipe 134, and a second filter pipe 136.

[0089] The well pipe 132 is hollow and can be installed inside the well casing 131. The water lifting device 120 can be installed inside the well pipe 132, which isolates the water lifting device 120 from the external environment. Specifically, the well pipe 132 mainly supports the well wall to prevent soil or stones from entering the well pipe 132 and affecting the installation of the water lifting device 120 and the water lifting effect. The well pipe 132 is not permeable and can be made of concrete pipe, steel pipe, or other materials that meet the strength requirements.

[0090] The first filter pipe 134 can be installed in the freshwater layer and on the well pipe 132 to filter freshwater from the external environment into the well pipe 132. The first filter pipe 134 can be permeable and have a certain strength to prevent soil or stones from entering the well pipe 132. The installation depth of the first filter pipe 134 can be determined according to the depth of the freshwater layer, and the length of the first filter pipe 134 is determined according to the thickness and collection capacity of the aquifer. This allows freshwater from the underground aquifer to enter the well pipe 132 for extraction by the water pumping device 120.

[0091] The second filter pipe 136 can be installed in the saline aquifer and on the well pipe 132 to filter saline water from the external environment into the well pipe 132. The second filter pipe 136 has a similar function to the first filter pipe 134, and it also has water permeability and a certain strength. The installation depth of the second filter pipe 136 can be determined according to the depth of the saline aquifer, and the length of the second filter pipe 136 is determined according to the thickness of the aquifer and its collection capacity. This allows saline water in the underground aquifer to enter the well pipe 132 for extraction by the water pumping device 120.

[0092] Since the freshwater and saline water layers are at different depths, a well pipe 132 can be spaced between the first filter pipe 134 and the second filter pipe 136, meaning the filter pipes on the well pipe 132 are installed alternately. The number of the first filter pipe 134 and the second filter pipe 136 is not specifically limited and can be set according to actual cost requirements or water quality requirements.

[0093] In the above implementation process, by setting up the well device 130, the water pumping device 120 can be isolated from the external environment, so as to filter fresh water and salt water in the external environment into the well pipe 132, thereby extracting purer fresh water and salt water and avoiding the problem of water quality being affected by other impurities.

[0094] In some embodiments, to avoid the fresh water and salt water filtered by the well device 130 from mixing in the well pipe 132 and affecting the subsequent mixing ratio of fresh water and salt water, the well pipe 132 is not completely connected. An isolation device 124 can be set in the middle to isolate the filtered fresh water and salt water.

[0095] To facilitate understanding, please refer to the following: Figure 4 , Figure 4 This is a detailed structural diagram of a water intake system 100 provided in an embodiment of this application. In some embodiments, the water lifting device 120 is used to extract fresh water and saline water respectively. Since the fresh water and saline water are at different depths, the lifting device may include a fresh water lifting device 122, a separation device 124, a saline water lifting device 126, and a mixing lifting device 128. The fresh water lifting device 122 is located in the fresh water layer and is used to extract fresh water, while the saline water lifting device 126 is located in the saline water layer and is used to extract saline water.

[0096] The isolation device 124 is used to isolate the freshwater extraction device 122 and the saltwater extraction device 126 to prevent the freshwater extraction device 122 from extracting saltwater and the saltwater extraction device 126 from extracting freshwater, thereby causing an inappropriate ratio of freshwater to saltwater in the future.

[0097] The freshwater extraction device 122 is connected to the isolation device 124 and the mixing extraction device 128, and is used to extract a first volume of freshwater.

[0098] The saline water extraction device 126 is connected to the mixing water extraction device 128 and is used to extract a second volume of saline water. The ratio of the first volume to the second volume is a preset volume ratio.

[0099] The isolation device 124 is used to isolate the freshwater layer and the saltwater layer so that the freshwater and saltwater do not mix inside the well pipe 132.

[0100] The freshwater extraction device 122 delivers the extracted freshwater to the mixing extraction device 128, and the saltwater extraction device 126 delivers the extracted saltwater to the mixing extraction device 128. The mixing extraction device 128 then mixes the freshwater and saltwater and delivers the mixture to the water supply pipeline.

[0101] In the above process, the isolation device 124 isolates the fresh water layer and the salt water layer, so that the fresh water extraction device 122 and the salt water extraction device 126 can extract relatively pure fresh water and salt water respectively, so that the fresh water and salt water can be more accurately mixed when they flow into the mixing extraction device 128.

[0102] like Figure 5 As shown, in some embodiments, the freshwater extraction device 122 includes a freshwater extraction pump 1222 and a freshwater extraction pipe 1224. The freshwater extraction pump 1222 is connected to the freshwater extraction pipe 1224 and is used to extract freshwater from the freshwater layer and transport the extracted freshwater to the mixing extraction device 128 through the freshwater extraction pipe 1224.

[0103] To facilitate the extraction of fresh water, the fresh water extraction device 122 is located in the fresh water layer. Since the fresh water layer is deeper than the saline water layer, the fresh water extraction device 122 is located below the well pipe 132, while the saline water extraction device 126 is located in the saline water layer, above the well pipe 132. In terms of relative position, the saline water extraction device 126 is above the fresh water extraction device 122.

[0104] The freshwater pump 1222 includes a motor, an inlet and an impeller, and is made of iron, PVC, PE or other common pipe materials. The motor can be connected to the control device 110 and controlled by the control device 110 to control the amount of freshwater pumped.

[0105] Since freshwater needs to be transported to the mixing and extraction device 128, and the freshwater layer and the saline water layer are isolated by the isolation device 124, the freshwater extraction pipe 1224 needs to pass through the isolation device 124 to connect to the mixing and extraction device 128. Specifically, the freshwater extraction pipe 1224 can be divided into two or more branches after passing through the isolation device 124. In this embodiment, it is divided into two branches to bypass the saline water extraction device 126, achieving separate transportation of freshwater and saline water while reducing space requirements.

[0106] In some embodiments, the saline water extraction device 126 may include a saline water extraction pump 1262 and a saline water extraction pipe 1264. The saline water extraction pump 1262 is connected to the saline water extraction pipe 1264 and is used to extract saline water from the saline aquifer and transport the extracted saline water through the saline water extraction pipe 1264 to the mixing extraction device 128.

[0107] The saline water pump 1262 may also include a motor, an inlet and an impeller, made of iron, PVC, PE or other common pipe materials. The motor can be connected to the control device 110 and controlled by the control device 110 to control the amount of saline water pumped.

[0108] The saline water lifting pipe 1264 can be directly connected to the mixing water lifting device 128, thereby allowing saline water to be directly transported into the mixing water lifting device 128.

[0109] In some embodiments, the mixing and lifting device 128 may include a mixing and lifting pipe 1282, a check valve 1284, and a gate valve 1286. The check valve 1284 and the gate valve 1286 are disposed on the mixing and lifting pipe 1282 and located between the mixing and lifting pipe 1282 and the water supply pipe. The mixing and lifting pipe 1282 is used to transport the mixed fresh water and salt water to the water supply pipe, and the gate valve 1286 is used to control the amount of mixed fresh water and salt water transported by the mixing and lifting pipe 1282.

[0110] In order to save space, the fresh water lifting pipe 1224 can be divided into two branches by the isolation device 124. The other end of the two branches is connected to the mixing lifting pipe 1282, and the saline water lifting pipe 1264 is directly connected to the mixing lifting pipe 1282. In this way, fresh water and saline water can be mixed in the mixing lifting pipe 1282.

[0111] To increase the transport capacity of both saltwater and freshwater, the diameter of the mixed water lifting pipe 1282 can be larger than the diameter of the saltwater lifting pipe 1264, which can accelerate the transport speed of both saltwater and freshwater.

[0112] The check valve 1284 can be used to prevent water hammer from damaging the freshwater pump 1222 and the saltwater pump 1262 when the system is shut down. The gate valve 1286 is used to control the water supply from the pumping device 120 to the water supply pipeline and to regulate the water supply.

[0113] In some implementations, such as Figure 6 As shown, the isolation device 124 may include a first flange 1241, a second flange 1242 and an isolation element 1243. The isolation element 1243 is disposed between the first flange 1241 and the second flange 1242, and the first flange 1241 and the second flange 1242 are disposed opposite to each other.

[0114] In order to achieve the isolation effect between fresh water and salt water, the isolation component 1243 can be made of a flexible isolation material. The materials of the first flange 1241 and the second flange 1242 can be determined according to the material of the fresh water lifting pipe 1224, and can be metal, PVC, PE or other materials.

[0115] To facilitate the placement of the isolation device 124 inside the well pipe 132, the first flange 1241 and the second flange 1242 are matched with the shape of the well pipe 132. If the well pipe 132 is cylindrical, the first flange 1241 and the second flange 1242 are also circular, with a diameter slightly smaller than the inner diameter of the well pipe 132, so that the two flanges can move up and down inside the well pipe 132 for easy installation.

[0116] The isolator 1243 is installed between the two flanges, and its diameter is the same as the inner diameter of the well pipe 132. This allows for better isolation between brackish and fresh water. The diameter of the isolator 1243 is larger than the diameters of the two flanges. The isolator 1243 has a certain strength and flexibility. Its strength is sufficient to isolate the mixing of the upper and lower water storage layers (i.e., the fresh water layer and the brackish water layer), and its flexibility is sufficient to allow the water lifting device 120 to be lifted and installed under certain external forces without the water lifting device 120 getting stuck in the well pipe 132 due to excessive strength.

[0117] In some embodiments, the first flange 1241, the isolator 1243, and the second flange 1242 are connected in series and can be fixed by a connector. A water passage hole can also be provided to facilitate the passage of the freshwater lifting pipe 1224. In a specific implementation, the first flange 1241 includes a first connecting hole 12412, a first water passage hole 12414, and a first cable hole 12416; the second flange 1242 includes a second connecting hole 12422, a second water passage hole 12424, and a second cable hole 12426; and the isolator 1243 includes a third connecting hole 12432, a third water passage hole 12434, and a third cable hole 12436.

[0118] The first connecting hole 12412, the second connecting hole 12422, and the third connecting hole 12432 are positioned correspondingly so that the first flange 1241, the second flange 1242, and the spacer 1243 can be connected through these connecting holes. These connecting holes can be screw holes, that is, the first flange 1241, the second flange 1242, and the spacer 1243 can be fixedly connected by screws.

[0119] Alternatively, the first flange 1241, the second flange 1242, and the isolator 1243 can be integrally formed, or they can be connected together by riveting or welding (in this case, the riveted or welded parts can be passed through the connecting holes to connect the first flange 1241, the second flange 1242, and the isolator 1243), only cable holes and water passage holes need to be reserved.

[0120] In order to make the connection between the first flange 1241, the second flange 1242 and the spacer 1243 more secure and less likely to fall off, the first connecting hole 12412, the second connecting hole 12422 and the third connecting hole 12432 can be multiple, and each connecting hole has the same number and the positions correspond one-to-one.

[0121] The first cable hole 12416, the second cable hole 12426, and the third cable hole 12436 are positioned correspondingly to provide a channel for the cable connecting the control device 110 and the freshwater lifting device 122. Specifically, the control device 110 is connected to the freshwater pump 1222 in the freshwater lifting device 122 via a cable, which passes through the cable hole. The diameter of the third cable hole 12436 can be the same as the diameter of the cable, while the diameters of the first cable hole 12416 and the third cable hole 12436 can be slightly larger than the diameter of the cable to facilitate cable laying.

[0122] The positions of the first water passage hole 12414, the second water passage hole 12424, and the third water passage hole 12434 correspond to each other and are used to provide a passage for the freshwater lifting pipe 1224 that transports freshwater. That is, if the flange at the top is called the first flange 1241 and the flange at the bottom is called the second flange 1242, then the freshwater lifting pipe 1224 passes through the second flange 1242, the isolation piece 1243, and the first flange 1241 in sequence.

[0123] Since the freshwater lifting pipe 1224 splits into two branches after passing through the isolation device 124, the first flange 1241 can have two first water passage holes 12414, while the second flange 1242 has one water passage hole, and the isolation element 1243 also has one water passage hole. The specific installation structure is as follows: Figure 7 As shown, the freshwater lifting pipe 1224 is divided into two branches after passing through the isolation member 1243. These two branches pass through the first flange 1241 and are connected to the mixing lifting device 128. Of course, if the freshwater lifting pipe 1224 is divided into N branches after passing through the isolation member 1243, the first flange 1241 provides N first water passage holes 12414.

[0124] Alternatively, to reduce the structural complexity of the isolation device 124, the first flange 1241 may have only one first water passage hole 12414. The fresh water lifting pipe 1224 is divided into N branches after passing through the first flange 1241 and then connected to the mixing water lifting device 128. In this way, there is no need to set more water passage holes for the first flange 1241.

[0125] In some embodiments, the first flange 1241, the second flange 1242 and the isolation member 1243 are provided with multiple through holes. These through holes may allow salt water and fresh water to permeate, thereby affecting the subsequent mixing ratio of salt water and fresh water. Therefore, in order to avoid this situation, a first water-stop plate can be provided on the first flange 1241 and a second water-stop plate can be provided on the second flange 1242.

[0126] The first water-stop plate is installed in the first cable hole 12416, and the second water-stop plate is installed in the second cable hole 12426, thereby preventing the exchange of fresh water and salt water through the cable holes. Of course, if the fresh water lifting pipe 1224 and the water passage hole are not strictly sealed, a water-stop plate can also be installed in the water passage hole.

[0127] The first and second water-stop plates have the same structure, such as... Figure 8 As shown, the first water-stop plate includes a first water-stop plate skeleton 1244 and a first cylindrical structure 1246. The first water-stop plate skeleton 1244 includes a first cylindrical body and a raised edge formed on the outer peripheral surface of one end of the first cylindrical body. The first cylindrical body structure has an annular groove corresponding to the first cylindrical body.

[0128] The second water-stop plate includes a second water-stop plate skeleton and a second cylindrical structure, which are the same as the structure of the first water-stop plate. The second water-stop plate skeleton includes a second cylindrical body and a protruding edge formed on the outer peripheral surface of one end of the second cylindrical body. The second cylindrical structure has an annular groove corresponding to the second cylindrical body.

[0129] The shape and size of the first and second water-stop plates match the shape and size of the cable hole or water passage hole. The annular groove is an expansion rubber groove, so that the cylindrical structure can expand after encountering water, thereby achieving tight compaction with the cable or fresh water lifting pipe 1224 and achieving the effect of blocking water.

[0130] In some implementations, continue as Figure 4 As shown, the control device 110 may include a conductivity-temperature probe 111, an electromagnetic flowmeter 112, a remote pressure gauge 113, a frequency converter 114, and a central controller 115.

[0131] Conductivity-temperature probe 111 is installed on freshwater extraction device 122, saline water extraction device 126 and mixed water extraction device 128, and is connected to central controller 115 via cable, for detecting the conductivity and temperature of freshwater and saline water.

[0132] Electromagnetic flowmeter 112 is installed on freshwater lifting device 122 and saltwater lifting device 126, and is connected to central controller 115 via wires to detect the amount of freshwater and saltwater lifted.

[0133] The remote pressure gauge 113 is installed on the mixing and water lifting device 128 to detect the outlet pressure of the mixing and water lifting device 128.

[0134] The frequency converter 114 is connected to the freshwater extraction device 122 and the saltwater extraction device 126 to control the extraction volume of the freshwater extraction device 122 and the saltwater extraction device 126.

[0135] The central controller 115 is used to adjust the power of the frequency converter 114 according to the preset water volume ratio so that the fresh water extraction device 122 and the salt water extraction device 126 extract fresh water and salt water according to the preset water volume ratio.

[0136] Specifically, the conductivity-temperature probe 111 is installed in the raised cavity on the freshwater extraction pipe 1224, the saline water extraction pipe 1264, and the mixed water extraction pipe 1282. The water flow in this cavity is relatively stable, which can avoid the influence of water volume fluctuations in the pipes on the conductivity measurement. The conductivity-temperature probe 111 can feed back the water conductivity-temperature of the water in the freshwater extraction pipe 1224, the saline water extraction pipe 1264, and the mixed water extraction pipe 1282 to the central controller 115 in real time.

[0137] The central controller 115 can calculate the salt content of fresh water, brackish water and mixed water by obtaining the water conductivity-temperature. The specific calculation principle is shown in the following process.

[0138] 1) Collect local deep groundwater W 淡 and shallow underground W 咸 Several water samples were collected, according to W 淡 :W 咸 Prepare 100 mL of each of the following solutions: 100%:0%, 80%:20%, 60%:40%, 40%:60%, 20%:80%, and 0%:1000%.

[0139] 2) The conductivity (EC) of the mixed water was measured using a conductivity-temperature probe 111 at temperatures of 0℃, 5℃, 10℃, 15℃, 20℃, 25℃, 30℃, and 35℃. The conductivity correction formula for different temperature conditions was obtained using least squares regression.

[0140] EC 25 =EC T [1+β(T-25)] (1)

[0141] In equation (1): EC 25 The conductivity value of the mixed water was measured at 25℃, and the unit is μS / m; EC T β represents the conductivity of the mixed water measured at temperature T, in μS / m; T is the measurement temperature; β is the fitting parameter.

[0142] 3) Using an evaporating dish, evaporate 100 mL of the mixed water to constant weight at 105±2℃. Determine the salt content of the mixed water using a gravimetric method. The calculation formula is as follows:

[0143]

[0144] In formula (2): C is the salt content, in mg / L; M is the total weight of the evaporating dish and residue, in g; M0 is the weight of the evaporating dish, in g; V is the volume of the water sample, in mL.

[0145] 4) The linear relationship between salinity and water conductivity at an ambient temperature of 25℃ was obtained using least squares regression, as shown in the following formula:

[0146] C = k × EC 25 +b (3)

[0147] In equation (3): K and b are fitting coefficients, and C represents the salt content.

[0148] 5) After receiving the temperature and conductivity of the water being measured, the central controller 115 first converts the measured water EC into EC according to equation (1).25 Then, the salt content (C, mg / L) is calculated using equation (3).

[0149] Therefore, the central controller 115 can calculate the salinity of fresh water, salinity of salt water, and salinity of mixed water in the manner described above.

[0150] The electromagnetic flow meter 112 can be installed on the freshwater lifting pipe 1224 and the saline water lifting pipe 1264, and is connected to the central controller 115 via a cable. It can collect the lifting volume of freshwater and saline water in real time.

[0151] The remote pressure gauge 113 can be installed on the upper part of the mixing water lifting pipe 1282 to monitor the water pressure of the mixing water lifting pipe 1282 in real time during the water lifting process.

[0152] The frequency converter 114 is connected to the motors of the freshwater pump 1222 and the saline water pump 1262. Under the control of the central controller 115, the frequency of the motors can be changed, thereby changing the flow rate and pressure of the freshwater pump 1222 and the saline water pump 1262.

[0153] After the central controller 115 obtains the outlet pressure of the mixed water lifting pipe 1282 detected by the remote pressure gauge 113, it controls the frequency converter 114 to adjust the motor frequency of the fresh water lifting pump 1222 and the salt water lifting pump 1262 according to the demand, so as to achieve the expected outlet pressure.

[0154] The central controller 115 can calculate the salinity of the fresh water and the salinity of the salt water according to the water extraction volume of the fresh water and the salt water, as well as the conductivity and temperature of the fresh water and the salt water, in the manner described above. Then, according to the current water volume ratio and the preset water volume ratio, the frequency converter 114 controls the water extraction volume of the fresh water extraction device 122 and the salt water extraction device 126 to adjust the water extraction volume, thereby realizing the change of the mixed water volume ratio of fresh water and salt water, so that the mixed water volume ratio reaches the preset water volume ratio.

[0155] The process for adjusting the mixing water ratio is as follows:

[0156] 1) First, measure the temperature and conductivity of the fresh and salt water, then calculate the salinity (C) of the fresh water using the formula described above. 淡 (mg / L) and salinity of saline water (C 咸 (mg / L).

[0157] 2) Input the real-time water pump flow rate demand Q into the central controller 115 according to the irrigation demand. d (m 3 / h) and the salinity of the mixed water (C d (mg / L) requirement.

[0158] 3) Calculate the starting flow rate (Q) of the freshwater pump 1222 according to the following formula. 淡启 m 3 / h) and the starting flow rate of the saline water pump 1262 (Q 咸启 m 3 / h).

[0159]

[0160] 4) Input the wellhead pump head H into the central controller 115. d ,m;

[0161] 5) Estimate the head loss h of the freshwater pump pipe using the head loss calculation formula. f淡 (m) and head loss of saltwater pump pipe h f咸 (m), the calculation formula is as follows:

[0162]

[0163] In equation (5): h f The friction loss is expressed in meters (m); f is the friction loss coefficient; Q g Where f is the pipe flow rate in L / h; D is the pipe inner diameter in mm; L is the pipe length in m; m is the flow rate index; and b is the pipe diameter index. The values ​​for f, m, and b are obtained from relevant pipe material data.

[0164] 6) Calculate the starting head H of freshwater pump 1222 and saltwater pump 1262. 启淡 (m) and H 启咸 (m):

[0165]

[0166] In equation (6): L 淡 The distance between the inlet of the freshwater pump 1222 and the wellhead is expressed in meters (m); L 咸 The distance between the inlet of the 1262 saltwater pump and the wellhead is in meters.

[0167] 7) Based on the starting flow rate and starting head of the freshwater pump 1222 and the saline water pump 1262, the central controller 115 selects the operating frequency F of the freshwater pump 1222. 淡启 (Hz) and the operating frequency F of the saltwater pump 1262 咸启 (Hz);

[0168] 8) According to the calculated operating frequency F of the freshwater pump 1222 淡启 (Hz) and the operating frequency F of the saltwater pump 1262 咸启 (Hz) Start the system and begin operation;

[0169] 9) During the water extraction process, the conductivity and temperature of the freshwater and the saline water are collected every 5 minutes, and the real-time salinity of the freshwater (C) is calculated. 淡实 (mg / L) and real-time salinity of saline water (C 咸实 (mg / L);

[0170] 10) Based on steps 2)-7) above, recalculate the operating frequency F of the freshwater pump 1222. 淡调 (Hz) and the operating frequency F of the saltwater pump 1262 咸调 (Hz), and controls the frequency converter 114 to adjust the operating frequency of each water pump, thereby adjusting the flow rate of the two water pumps to ensure that the irrigation water flow rate, outlet pressure, and salinity meet the design requirements (such as the ratio of fresh water to saline water reaching the preset ratio). The principle is as follows: Figure 9 As shown, the specific process is as follows: When the pump head H1 is set, if the actual flow rate Q2 exceeds the calculated flow rate, the pump frequency is adjusted from f1 to f2 by the frequency converter 114, and the pump head-flow curve changes, so that the pumping flow rate is reduced to Q1 while H1 remains unchanged; the reverse is also true. In this way, the water extraction volume can be controlled, and thus the mixed water volume ratio can be controlled.

[0171] The working principle of the entire water intake system 100 is explained below.

[0172] During the construction of the well device 130, two water intake layers can be set up according to the characteristics of groundwater quantity and quality. Freshwater filter pipes (such as the first filter pipe 134 mentioned above) and saline water filter pipes (such as the second filter pipe 136 mentioned above) are set up in different layers to realize the collection of deep freshwater and shallow saline water.

[0173] When the water lifting device 120 is installed, freshwater pump 1222 and saline water pump 1262 are installed to correspond to different water qualities. An isolation device 124 is installed to isolate the extraction of freshwater and saline water, thereby achieving precise mixing of the two. When the water lifting device 120 is operating, the freshwater pump 1222 and saline water pump 1262 simultaneously lift water. After being lifted through the freshwater lifting pipe 1224 and the saline water lifting pipe 1264, the water is mixed in the mixing pipe 1282. This effectively reduces the system investment and management costs associated with surface water mixing in traditional methods.

[0174] After the control device 110 is installed, when the water lifting device 120 starts lifting water, the conductivity-temperature probe 111 transmits the detected conductivity and temperature to the central controller 115 in real time. At the same time, the central controller 115 obtains the outlet pressure of the mixing water lifting pipe 1282 through the remote pressure gauge 113 and obtains the water lifting volume of saline and fresh water through the electromagnetic flow meter 112. Based on these data, it can be determined whether the mixing ratio of fresh water and saline water reaches the preset water volume ratio. If it exceeds the preset water volume ratio (such as the salt content of the mixed water is higher than the expected value), then based on the measured conductivity and flow rate values ​​of fresh water and saline water, the frequency converter 114 controls the output power of the fresh water lifting pump 1222 to be increased and the output power of the saline water lifting pump 1262 to be decreased, thereby increasing the fresh water lifting volume and decreasing the saline water lifting volume, so that the mixing ratio of fresh water and saline water reaches the preset water volume ratio. If the preset water volume ratio is not achieved (e.g., the salinity of the mixed water does not reach the expected value), the output power of the fresh water pump 1222 and the output power of the saline water pump 1262 are reduced by the frequency converter 114 based on the measured conductivity and flow rate of the fresh water and saline water, thereby reducing the fresh water pumping volume and increasing the saline water pumping volume, so that the mixing ratio of fresh water and saline water reaches the preset water volume ratio.

[0175] Therefore, the water intake system 100 provided in this application embodiment can simultaneously extract deep fresh water and shallow saline water from a single well, reducing the need to drill two wells in the traditional approach to one well. This greatly reduces the well drilling investment for the saline and fresh water mixed irrigation system, reduces system investment and operating costs, reduces the amount of groundwater extracted, and achieves efficient and sustainable utilization of regional water resources.

[0176] Furthermore, by monitoring the conductivity of freshwater and saline water, the mixing ratio of freshwater and saline water can be calculated. The pumping volume of freshwater pump 1222 and saline water pump 1262 can be controlled by frequency converter 114, so that freshwater and saline water can be extracted on demand in the well and accurately mixed in the well. This avoids the situation where the ratio of freshwater and saline water is not suitable after being extracted to the ground, which requires repeated measurement and adjustment. This greatly reduces the difficulty of irrigation control and does not cause energy waste.

[0177] In summary, this application provides a water intake system 100, which uses a control device 110 to control a water lifting device 120 to extract fresh water and saline water according to a preset water volume ratio. This allows the water lifting device 120 to extract fresh water and saline water separately according to the preset water volume ratio, and then mix the fresh water and saline water before delivering them to the water supply pipeline. Thus, the mixing of fresh water and saline water can be completed by the water lifting device 120, which only requires drilling a well and does not require the construction of a ground mixing tank, greatly reducing the investment cost of the irrigation system.

[0178] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A water intake system, characterized in that, The water intake system includes: Water lifting device and control device; The control device is connected to the water lifting device and is used to control the water lifting device to extract fresh water and salt water according to a preset water volume ratio. The water extraction device is used to extract fresh water and salt water respectively according to the preset water volume ratio, and to mix the fresh water and salt water in the preset water volume ratio and then transport them to the water supply pipeline. The water lifting device includes: Freshwater extraction devices, isolation devices, saline water extraction devices, and mixed water extraction devices; The freshwater extraction device is connected to the isolation device and the mixing extraction device, and is used to extract a first amount of freshwater. The saline water extraction device is connected to the mixing water extraction device and is used to extract a second amount of saline water, wherein the ratio of the first amount of water to the second amount of water is the preset water volume ratio. The isolation device is used to isolate the freshwater layer and the saline water layer; The mixing and extraction device is used to mix the extracted fresh water and salt water and then transport them to the water supply pipeline. The isolation device includes: First flange, second flange, and spacer; The isolation element is disposed between the first flange and the second flange, and the first flange and the second flange are disposed opposite to each other; The first flange includes a first connecting hole, a first water passage hole, and a first cable hole; the second flange includes a second connecting hole, a second water passage hole, and a second cable hole; and the isolator includes a third connecting hole, a third water passage hole, and a third cable hole. The first connecting hole, the second connecting hole, and the third connecting hole are in corresponding positions, and the first flange, the second flange, and the isolation member are connected through the connecting holes; The first cable hole, the second cable hole, and the third cable hole are positioned correspondingly to provide a channel for the cable connecting the control device and the freshwater extraction device. The first water passage, the second water passage, and the third water passage are positioned correspondingly to provide a channel for the freshwater lifting pipe that transports freshwater. A first water-stop plate is provided in the cable hole of the first flange, and a second water-stop plate is provided in the cable hole of the second flange. The first water-stop plate includes a first water-stop plate frame and a first cylindrical structure; The second water-stop plate includes a second water-stop plate frame and a second cylindrical structure; The first waterstop plate frame includes a first cylindrical body and a raised edge formed on the outer peripheral surface of one end of the first cylindrical body. The first cylindrical structure has an annular groove corresponding to the first cylindrical body. The second waterstop plate frame includes a second cylindrical body and a raised edge formed on the outer peripheral surface of one end of the second cylindrical body. The second cylindrical structure has an annular groove corresponding to the second cylindrical body. The control device includes: Conductivity-temperature probes, electromagnetic flowmeters, remote pressure gauges, frequency converters, and central controllers; The conductivity-temperature probe is installed on the freshwater extraction device, the saline water extraction device, and the mixed water extraction device, and is connected to the central controller via a cable. It is used to detect the conductivity and temperature of freshwater, saline water, and mixed water. The electromagnetic flowmeter is installed on the freshwater extraction device and the saline water extraction device, and is connected to the central controller via a wire to detect the extraction volume of freshwater and saline water. The remote pressure gauge is installed on the mixing and water extraction device and is used to detect the outlet pressure of the mixing and water extraction device; The frequency converter is connected to the freshwater extraction device and the saline water extraction device, and is used to control the extraction volume of the freshwater extraction device and the saline water extraction device. The central controller is used to adjust the power of the frequency converter according to the preset water volume ratio, so that the fresh water extraction device and the saline water extraction device extract fresh water and saline water according to the preset water volume ratio. The process by which the central controller adjusts the mixing ratio includes: After receiving the conductivity and temperature of fresh water, brackish water, and mixed water detected by the conductivity-temperature probe, the conductivity values ​​of fresh water, brackish water, and mixed water are determined respectively using the following formulas: ； in, EC 25 The conductivity value of fresh water, brackish water, or mixed water at 25℃. EC T The conductivity value of fresh water, brackish water, or mixed water measured at temperature T. T To measure temperature, β These are the fitting parameters; The salinity of fresh water, brackish water, and mixed water can be determined using the following formulas: ； in, k and b These are the fitting coefficients, C Indicates salt content; The starting flow rate of a freshwater pump can be calculated using the following formula. and the starting flow rate of the saline water pump : ； in, Q d To meet the real-time flow requirements of the water pump, C d To meet the salinity requirements of the mixed water, Indicates the salinity of fresh water. Indicates the salt content of saline water; Estimate the head loss of a freshwater pump pipe using the following head loss calculation formula. Head loss in saltwater pump pipe : ； in, h f For head loss along the route, This is the coefficient for head loss along the friction path. Q g For pipeline flow rate, D The inner diameter of the pipe. L As the head of the department, m For traffic index, b Pipe diameter index; The starting head of the freshwater pump and the saline water pump is calculated using the following formula. and : ； in, The distance between the inlet of the freshwater pump and the wellhead is given. The distance between the inlet of the saline water pump and the wellhead is given. H d The head of the wellhead pump; The operating frequency of the freshwater pump is determined based on the starting flow rate and starting head of the freshwater pump and the saline water pump. and the operating frequency of the saline water pump and according to working frequency and The variable frequency drive is controlled to adjust the operating frequency of each water pump so that the ratio of fresh water to salt water reaches the preset ratio.

2. The water intake system according to claim 1, characterized in that, The freshwater extraction device includes: Freshwater pump and freshwater lifting pipe; The freshwater pump is connected to the freshwater extraction pipe and is used to extract freshwater from the freshwater layer and transport the extracted freshwater to the mixing extraction device through the freshwater extraction pipe.

3. The water intake system according to claim 1, characterized in that, The saline water extraction device includes: Saltwater pump and saltwater lifting pipe; The saline water pump is connected to the saline water extraction pipe and is used to extract saline water from the saline layer and transport the extracted saline water to the mixing extraction device through the saline water extraction pipe.

4. The water intake system according to claim 1, characterized in that, The mixing and water extraction device includes: Mixed water lifting pipe, check valve and gate valve; The check valve and the gate valve are installed on the mixing water lifting pipe; The mixing and lifting pipe is used to transport the mixed fresh water and salt water to the water supply pipe; The gate valve is used to control the amount of fresh and salt water conveyed by the mixing water lifting pipe.

5. The water intake system according to claim 1, characterized in that, The water intake system also includes: A well assembly for housing the water lifting device; The well equipment includes: Well casing and first filter pipe, second filter pipe; The water lifting device is installed inside the well pipe, and the well pipe is used to isolate the water lifting device from the external environment; The first filter pipe is disposed in the freshwater layer and on the well pipe, and is used to filter freshwater from the external environment into the well pipe; The second filter pipe is located in the saline layer and is installed on the well pipe to filter saline water from the external environment into the well pipe.

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