Multi-layer graded filtering device for recirculating aquaculture

Abstract

The present invention relates to the technical field of filtration, and discloses a multi-layer grading filtration apparatus for recirculating aquaculture, the multi-layer grading filtration apparatus comprises: a first filtration tank for removing large particle impurities in a water body; the filter box II is used for adsorbing soluble organic matters in water; the filter box III is used for deeply filtering the water body; the filter box IV is used for further removing suspended particles and fine impurities; collecting assemblies are arranged in the filtering boxes, and filtering assemblies with different precisions are arranged in the first filtering box, the third filtering box and the fourth filtering box respectively. Preferably, the filtering assembly comprises a filtering pipe. Through graded filtration, intelligent monitoring, self-cleaning functions and modular design, efficient purification of a water body, intelligent regulation and control of the system, convenient maintenance and stable operation are achieved, and compared with the problems of low filtration efficiency, regulation and control lagging, tedious maintenance and unstable structure in the prior art, the applicability and reliability are remarkably improved.

Description

Technical Field

[0001] The invention relates to the field of filtration technology, in particular to a multi-layer graded filtration device for circulating aquaculture. Background Art

[0002] With the rapid development of the aquaculture industry, recirculating aquaculture systems have gradually become an efficient and environmentally friendly aquaculture method; recirculating aquaculture uses filtration and purification systems to treat and recycle aquaculture wastewater, which not only significantly reduces water resource consumption, but also reduces environmental pollution caused by water discharge.

[0003] The filtration system lacks graded filtration and intelligent adjustment functions, making it difficult to handle complex water quality; the cleaning method mainly relies on manual disassembly, which makes maintenance cumbersome and affects continuous operation; the system has poor operating stability, uneven water flow distribution, insufficient modular design, and is difficult to adapt to the needs of different scales; sterilization technology mostly relies on chemical agents, which can easily cause secondary pollution. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a multi-layer graded filtration device for recirculating aquaculture, which solves the problems of lack of graded filtration and intelligent adjustment in the filtration system, manual disassembly for cleaning, and cumbersome maintenance; poor operating stability, uneven water flow distribution, and insufficient modular design; and sterilization mostly relies on chemical agents, which is prone to secondary pollution.

[0005] To achieve the above purpose, the present invention is implemented by the following technical scheme: a multi-layer graded filtration device for circulating aquaculture, comprising:

[0006] Filter box 1, used to remove large particles of impurities in the water;

[0007] Filter box 2, used to absorb dissolved organic matter in water;

[0008] Filter box three, used for deep filtration of water;

[0009] Filter box four, used to further remove suspended particles and fine impurities;

[0010] The filter boxes are all provided with collection components inside, and the filter boxes 1, 3 and 4 are respectively provided with filter components with different precisions.

[0011] Preferably, the filter assembly includes filter tubes, and the filter tubes are equidistantly arranged inside filter box one, filter box three and filter box four, and filter screens are arranged outside the filter tubes, and the filter screens are respectively a coarse filter screen, a medium filter screen and a fine filter screen, and the coarse filter screen, the medium filter screen and the fine filter screen are respectively arranged inside filter box one, filter box three and filter box four, and drainage holes are equidistantly opened outside the filter tubes, a plurality of water inlet flanges are arranged outside the filter box one, and a baffle plate one is arranged on the inner top wall of the filter box one.

[0012] Preferably, a biological filtration layer and an activated carbon layer are respectively arranged inside the filter box 2, and a plurality of water outlet flanges 2 are equidistantly arranged on the rear side of the filter box 2.

[0013] Preferably, the collection component includes a dissolved oxygen sensor, a pH sensor, an ammonia nitrogen sensor and a turbidity sensor, and the dissolved oxygen sensor, pH sensor, ammonia nitrogen sensor and turbidity sensor are all arranged on the inner walls of filter box one, filter box two, filter box three and filter box four, and the dissolved oxygen sensor, pH sensor, ammonia nitrogen sensor and turbidity sensor are arranged at a certain interval, and the dissolved oxygen sensor, pH sensor, ammonia nitrogen sensor and turbidity sensor transmit the collected data to the central control system.

[0014] Preferably, baffle plate 2 is provided inside filter box 1, filter box 3 and filter box 4, and interlayer is provided between baffle plate 2 and inner wall of filter box 1, filter box 3 and filter box 4, the filter tubes are connected with water pipes through pipelines, the water pipes are connected with output ends of high-pressure pumps through pipelines, and the high-pressure pump is arranged on the outside of filter box 2, and electronic valve 1 is provided on the outside of the water pipe, the outside of filter box 1, filter box 3 and filter box 4 are connected with the water inlet of sedimentation box through pipeline drainage pipe, and the sedimentation box is arranged on the outside of filter box 2, and water outlet flange 1 is provided on the outside of the sedimentation box, and each connecting pipe of the drainage pipe is provided with electronic valve 2.

[0015] Preferably, the tops of the filter boxes 2, 3 and 4 are provided with a plurality of mounting holes at equal distances, the inner sides of the mounting holes are provided with annular grooves, the inner sides of the annular grooves are provided with rubber rings, the lower ends of the filter tubes are engaged with the mounting holes, and the outer diameters of the filter tubes are in contact with the rubber rings, and the outer diameters of the rubber rings are larger than the inner diameters of the annular grooves.

[0016] Preferably, a plurality of water suction pumps are equidistantly arranged on the top of the filter box one, and an electronic valve one is provided at the output end of the water suction pump. A plurality of ultraviolet sterilizers are equidistantly arranged on the rear side of the filter box three, and the water inlet of the ultraviolet sterilizer is connected to the water outlet flange two, and the water outlet of the ultraviolet sterilizer is connected to the input end of the water suction pump through a pipeline.

[0017] Preferably, L fixing plate 2 is provided at the four outer corners of the filter box 1, L fixing plate 1 and L fixing plate 2 are equidistantly provided at the four outer corners of the filter box 3 and the filter box 4, L fixing plate 1 is provided at the four outer corners of the filter box 2, and L fixing plate 1 and L fixing plate 2 are connected by bolts.

[0018] Preferably, support legs are provided at the four corners of the bottom of the second filter box and the sedimentation box, and the support legs are equidistantly distributed.

[0019] Preferably, the central control system includes:

[0020] Monitoring module: It is used to transmit the data collected by dissolved oxygen sensor, pH sensor, ammonia nitrogen sensor and turbidity sensor to the central control system;

[0021] Analysis module: It analyzes the data collected in the central control system through the data processing unit. The present invention provides a multi-layer graded filtration device for circulating aquaculture. It has the following beneficial effects:

[0022] 1. The present invention adopts the technical scheme of graded filtration of filter box 1, filter box 2, filter box 3 and filter box 4, and realizes the gradual removal of large particles of impurities and tiny particles in water through multi-layer treatment of coarse filtration, medium filtration, biological adsorption and chemical adsorption and fine filtration, achieving the technical effect of efficient purification of water. Compared with the problem of low efficiency of single filtration method in the prior art, it solves the defect of insufficient capacity for complex water pollution treatment.

[0023] 2. The present invention realizes the real-time collection and analysis of water quality parameters by setting dissolved oxygen sensors, pH sensors, ammonia nitrogen sensors and turbidity sensors as well as the monitoring module and analysis module of the central control system, and automatically adjusts the operating state of the filtration system, achieving the technical effect of intelligent water quality monitoring and efficient system operation. Compared with the problem of manual monitoring and delayed adjustment response in the prior art, the defects of low efficiency and insufficient precision of water quality control are solved.

[0024] 3. The present invention realizes efficient backwashing of the filter tube and filter screen through the reverse water flow provided by the high-pressure pump, and centrally treats the cleaning wastewater through the drain pipe and the sedimentation tank, thereby achieving the technical effect of efficient self-cleaning. Compared with the problem that the filter device in the prior art needs to be frequently disassembled and cleaned, the defects of complex maintenance and low operating efficiency are solved.

[0025] 4. The present invention sets baffle 2 to isolate the interference of water pipeline, ultraviolet sterilizer to disinfect and sterilize water, and L fixing plate and supporting legs to ensure the structural stability of the equipment. At the same time, modular design is adopted to make the installation, disassembly and maintenance of the filter box more convenient, improve the flexibility and adaptability of the system, and achieve the technical effect of stable system operation, safe and reliable and easy maintenance; compared with the problems of unstable equipment structure, low functional integration and complex maintenance in the prior art, the defects of unreliable operation, limited scope of application and low maintenance efficiency are solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an overall stereogram of the present invention;

[0027] Figure 2 It is a rear view schematic diagram of the present invention;

[0028] Figure 3 It is a front view schematic diagram of the development of the present invention;

[0029] Figure 4 It is a right side schematic diagram of the development of the present invention;

[0030] Figure 5 It is a partial cross-sectional schematic diagram of the present invention;

[0031] Figure 6 For the present invention Figure 5 The enlarged schematic diagram of point A in the middle;

[0032] Figure 7 For the present invention Figure 1 A cross-sectional schematic diagram of a filter box 1;

[0033] Figure 8 For the present invention Figure 1 A cross-sectional schematic diagram of the middle filter box 2;

[0034] Fig. 9 It is a flow chart of the central control system of the present invention.

[0035] Among them, 1. Filter box one; 2. Filter box two; 3. Filter box three; 4. Filter box four; 5. L fixing plate one; 6. L fixing plate two; 7. Water outlet flange one; 8. Sedimentation box; 9. High-pressure pump; 10. Ultraviolet sterilizer; 11. Support legs; 12. Water inlet flange; 13. Suction pump; 14. Electronic valve one; 15. Electronic valve two; 16. Water outlet flange two; 17. Filter tube; 18. Annular groove; 19. Mounting hole; 20. Rubber ring; 21. Filter net; 22. Drain hole; 23. Dissolved oxygen sensor; 24. PH sensor; 25. Ammonia nitrogen sensor; 26. Turbidity sensor; 27. Baffle one; 28. Biological filter layer; 29. ​​Activated carbon layer; 30. Water supply pipe; 31. Baffle two; 32. Drain pipe. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Please see attached Figure 1 -Attached Figure 6 The embodiment of the present invention provides a multi-layer graded filtration device for circulating aquaculture, comprising:

[0038] Filter box 1 is used to remove large particles of impurities in the water body; filter box 4 is used to further remove suspended particles and fine impurities; filter box 3 is used to deeply filter the water body;

[0039] Filter box 1 is used for coarse filtration of water bodies. It reduces the initial pollution load of water bodies by removing large particles of impurities, thereby providing good basic conditions for subsequent treatment by filter boxes. Filter box 4 is used to further remove suspended particles and fine impurities. It finely filters residual pollutants in the water body through a fine filter mesh 21 to ensure that the water body meets high transparency requirements. Filter box 3 is used for deep filtration of water bodies. It further removes suspended particles through a medium filter mesh 21, and at the same time plays a role in balancing the water quality, thereby ensuring the stability of the overall filtration efficiency. Filter box 2 2 is used to adsorb soluble organic matter in water. It works together with a biological filtration layer 28 and an activated carbon layer 29 respectively arranged inside to adsorb soluble harmful chemicals in the water body, and decomposes harmful substances such as ammonia nitrogen through nitrifying bacteria, further improving the safety of water quality. The purified water is discharged through the outlet flange 2 16;

[0040] The inside of the filter box 1, filter box 3, 3 and filter box 4 are all provided with baffle 2, 31, and interlayers are provided between baffle 2 and the inner walls of the filter box 1, filter box 2, 2, filter box 3, 3 and filter box 4. The filter tubes 17 are connected to the water pipe 30 through pipelines, and the water pipes 30 are connected to the output end of the high-pressure pump 9 through pipelines, and the high-pressure pump 9 is arranged on the outside of the filter box 2, 2, and the outside of the water pipe 30 is provided with an electronic valve 14. The outsides of the filter box 1, filter box 3, 3 and filter box 4 are connected to the water inlet of the sedimentation box 8 through a pipeline drain pipe 32, and the sedimentation box 8 is arranged on the outside of the filter box 2, 2, and the outside of the sedimentation box 8 is provided with a water outlet flange 17. Each connecting pipe of the drain pipe 32 is provided with an electronic valve 215.

[0041] Baffle 2 31 is provided inside the filter box 1, filter box 3 3 and filter box 4 4. Baffle 2 31 is used to isolate the pipe part connected to the water pipe 30 to prevent the water flow from interfering with the normal operation of the filter area, thereby optimizing the water flow distribution and improving the filtration efficiency; interlayers are provided between baffle 2 31 and the inner walls of filter box 1, filter box 3 3 and filter box 4 4. The existence of the interlayer helps to stabilize the installation environment of the filter tube 17 and reduce the impact of water flow vibration on the operation of the equipment during the filtration process; the filter tubes 17 are connected to the water pipe 30 through pipes, and the water pipe 30 provides a stable path for the transportation of water between different filter boxes, thereby ensuring the water circulation efficiency of the entire system; the water pipe 30 The high-pressure pump 9 is connected to the output end of the high-pressure pump 9 through a pipeline. The high-pressure pump 9 provides stable and sufficient water pressure to support the smooth progress of the filtration and backwashing process, and is arranged on the outside of the filter box 2 for easy maintenance and operation; the outsides of the filter box 1, the filter box 3, and the filter box 4 are all connected to the water inlet of the sedimentation box 8 through the drain pipe 32. The drain pipe 32 is responsible for transporting the backwashing wastewater and impurities accumulated in the filtration process to the sedimentation box 8 to prevent them from causing secondary pollution to the main circulating water body; the sedimentation box 8 is arranged on the outside of the filter box 2, and the solid impurities are removed by physical sedimentation inside. The precipitated water is discharged through the water outlet flange 7, thereby ensuring the centralized treatment and reuse of the backwashing water;

[0042] The tops of the filter box 2, filter box 3, and filter box 4 are equidistantly provided with a plurality of mounting holes 19, the inner sides of the mounting holes 19 are provided with annular grooves 18, the inner sides of the annular grooves 18 are provided with rubber rings 20, the lower ends of the filter tubes 17 are engaged with the mounting holes 19, and the outer diameter of the filter tubes 17 is in contact with the rubber rings 20, and the outer diameter of the rubber rings 20 is larger than the inner diameter of the annular grooves 18;

[0043] The tops of the filter box 2, filter box 3, and filter box 4 are equidistantly provided with multiple mounting holes 19. The presence of the mounting holes 19 facilitates the installation and replacement of the filter tube 17, thereby improving the maintenance convenience of the device. The inner sides of the mounting holes 19 are provided with an annular groove 18, which is used to fix a rubber ring 20. The outer diameter of the rubber ring 20 is larger than the inner diameter of the annular groove 18, which can provide a sealing effect for the filter tube 17, prevent water leakage, and ensure the airtightness of the system;

[0044] A plurality of water suction pumps 13 are equidistantly arranged on the top of the filter box 1, and an electronic valve 14 is arranged at the output end of each water suction pump 13. A plurality of ultraviolet sterilizers 10 are equidistantly arranged on the rear side of the filter box 3, and the water inlet of the ultraviolet sterilizer 10 is connected to the water outlet flange 2 16, and the water outlet of the ultraviolet sterilizer 10 is connected to the input end of the water suction pump 13 through a pipeline.

[0045] A plurality of water suction pumps 13 are equidistantly arranged on the top of the filter box 1. The function of the water suction pump 13 is to provide power for the filtration system, to drive the water flow to run along a predetermined path and realize circulation treatment. The output end of the water suction pump 13 is provided with an electronic valve 14. The electronic valve 14 can adjust the water flow according to the command of the central control system, further optimize the water flow efficiency and ensure the intelligent operation of the system; a plurality of ultraviolet sterilizers 10 are equidistantly arranged on the rear side of the filter box 3. The function of the ultraviolet sterilizer 10 is to use ultraviolet radiation to kill pathogenic microorganisms and algae in the water, thereby ensuring the safety of the water body; the water inlet of the ultraviolet sterilizer 10 is connected to the water outlet flange 2 16. The water outlet flange 2 16 is responsible for conveying the water treated by the filter box 2 2 into the ultraviolet sterilizer 10 for sterilization treatment. The water outlet of the ultraviolet sterilizer 10 is connected to the input end of the water suction pump 13 through a pipeline, thereby completing the transportation of the sterilized water back to the circulation system;

[0046] The four outer corners of the filter box 1 are provided with L fixing plates 2 6, the four outer corners of the filter box 3 3 and the filter box 4 4 are equidistantly provided with L fixing plates 1 5 and L fixing plates 2 6, and the four outer corners of the filter box 2 2 are provided with L fixing plates 1 5, and the L fixing plates 1 5 and L fixing plates 2 6 are connected by bolts;

[0047] The four outer corners of the filter box 1 are provided with L fixing plates 26, the four outer corners of the filter box 3 3 and the filter box 4 4 are equidistantly provided with L fixing plates 15 and L fixing plates 26, and the four outer corners of the filter box 2 2 are provided with L fixing plates 15. The L fixing plates 15 and L fixing plates 26 are connected by bolts, and the function of the bolts is to provide a stable mechanical connection, thereby ensuring the structural stability of the device during operation;

[0048] The four corners of the bottom of the filter box 2 and the sedimentation box 8 are all provided with support legs 11, and the support legs 11 are equidistantly distributed;

[0049] Support legs 11 are provided at the four bottom corners of the filter box 2 and the sedimentation box 8. The support legs 11 provide a reliable support structure for the filtration system. The equidistant distribution of the support legs 11 can balance the weight of the device, thereby enhancing the overall stability of the system.

[0050] Please see attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 , Attachment Figure 7 With attached Figure 8, filter boxes 1, 3 and 4 are respectively provided with filter components of different precisions, the filter components include filter tubes 17, the filter tubes 17 are equidistantly arranged inside the filter boxes 1, 3 and 4, filter screens 21 are arranged outside the filter tubes 17, and the filter screens 21 are respectively coarse filter screens, medium filter screens and fine filter screens, and the coarse filter screens, medium filter screens and fine filter screens are respectively arranged inside the filter boxes 1, 3 and 4, the filter tubes 17 are equidistantly provided with drainage holes 22 outside, a plurality of water inlet flanges 12 are arranged outside the filter box 1, and a baffle 27 is arranged on the inner top wall of the filter box 1;

[0051] Filter boxes 1, 3 and 4 are respectively provided with filter components of different precisions, and the filter components include filter tubes 17, and the filter tubes 17 are equidistantly arranged inside the filter boxes, and filter screens 21 are arranged outside the filter boxes; the filter screens 21 are respectively coarse filter screens, medium filter screens and fine filter screens, and the coarse filter screen is arranged in the filter box 1, mainly used to remove large particles of impurities; the medium filter screen is arranged in the filter box 3, used to further remove suspended particles; the fine filter screen is arranged in the filter box 4, used to remove fine particles in the water, so as to ensure the clarity of the water quality;

[0052] The filter boxes are all provided with collection components, including dissolved oxygen sensors 23, pH sensors 24, ammonia nitrogen sensors 25 and turbidity sensors 26. The dissolved oxygen sensors 23, pH sensors 24, ammonia nitrogen sensors 25 and turbidity sensors 26 are all provided on the inner walls of the filter box 1, filter box 2, filter box 3, 3 and filter box 4, and the dissolved oxygen sensors 23, pH sensors 24, ammonia nitrogen sensors 25 and turbidity sensors 26 are arranged at a certain interval. The dissolved oxygen sensors 23, pH sensors 24, ammonia nitrogen sensors 25 and turbidity sensors 26 transmit the collected data to the central control system.

[0053] A collection component is provided inside the filter box, and the collection component includes a dissolved oxygen sensor 23, a pH sensor 24, an ammonia nitrogen sensor 25 and a turbidity sensor 26; the collection component monitors water parameters in real time and transmits the collected data to the central control system; the central control system includes a monitoring module and an analysis module, wherein the monitoring module is responsible for receiving the data collected by the dissolved oxygen sensor 23, the pH sensor 24, the ammonia nitrogen sensor 25 and the turbidity sensor 26, and the analysis module analyzes the collected data through the data processing unit, thereby realizing intelligent control and operation optimization of the filtration system;

[0054] The filter box 2 is used to absorb dissolved organic matter in water. The interior of the filter box 2 is respectively provided with a biological filter layer 28 and an activated carbon layer 29. A plurality of water outlet flanges 216 are equidistantly arranged on the rear side of the filter box 2. The filter box 2 is used to absorb dissolved organic matter in water, which is acted upon by the biological filter layer 28 and the activated carbon layer 29. The nitrifying bacteria attached to the biological filter layer 28 can decompose harmful substances such as ammonia nitrogen and nitrite in the water, and convert them into safer nitrates, thereby effectively reducing the toxicity of the water and improving the safety of the water quality. The activated carbon layer 29 has a high-efficiency adsorption capacity and can absorb dissolved organic matter, odor and other trace pollutants in the water, thereby further purifying the water and improving the physical and chemical properties of the water quality. A plurality of water outlet flanges 216 are equidistantly arranged on the rear side of the filter box 2, and these flanges are used to evenly transport the treated water and send it to the next-level filter unit or other treatment equipment to ensure the uniformity of water flow distribution, thereby avoiding differences in local treatment effects caused by uneven water flow.

[0055] Please see attached Fig. 9 , the central control system includes:

[0056] Monitoring module: It is used to transmit the data collected by the dissolved oxygen sensor 23, the pH sensor 24, the ammonia nitrogen sensor 25 and the turbidity sensor 26 to the central control system;

[0057] Analysis module: It analyzes the data collected in the central control system through the data processing unit;

[0058] The central control system includes a monitoring module and an analysis module. The monitoring module is used to transmit the water quality parameter data collected by the dissolved oxygen sensor 23, the pH sensor 24, the ammonia nitrogen sensor 25 and the turbidity sensor 26 to the central control system in real time. The dissolved oxygen sensor 23 is used to detect the dissolved oxygen concentration in the water body, so as to determine whether the water body meets the oxygen demand conditions of aquatic organisms; the pH sensor 24 is used to monitor the pH of the water body, detect abnormal fluctuations in time, and ensure that the acid-base balance of the water body is suitable for the breeding environment; the ammonia nitrogen sensor 25 monitors the ammonia nitrogen concentration in the water body in real time, and warns of potential toxic risks by detecting whether it exceeds the safety threshold; the turbidity sensor 26 is used to evaluate the transparency of the water body and determine the working status and efficiency of the filtration system. The monitoring module collects the real-time data of these sensors and transmits them to the analysis module of the central control system. The analysis module analyzes and processes the collected data through the data processing unit, and comprehensively evaluates the water quality in combination with the preset parameters of the system operation. The analysis results can be used to trigger the automatic adjustment function of the system, such as adjusting the switch status of electronic valve 14 and electronic valve 2 15, controlling the water flow rate, or starting the high-pressure pump 9 and the backwash function, thereby realizing intelligent management and efficient operation of the entire filtering device.

[0059] Working principle: The multi-layer graded filtration device for circulating aquaculture realizes efficient purification of the water body and self-cleaning maintenance of the device through the graded filtration and backwashing functions of filter box 1 to filter box 4; wherein, filter box 1 performs coarse filtration on the water body to remove large particles of impurities, and the water flows in through the water inlet flange 12, and after preliminary filtration by the coarse filter screen 21, it is led out by the filter tube 17, and the baffle 1 27 is arranged on the inner top wall of the filter box 1 to prevent the water flow from directly impacting the filter tube 17, protecting the filtration structure and optimizing the water flow distribution; the filter box 2 performs medium filtration on the water body, and further removes suspended particles and finer impurities through the medium filter screen 21 to ensure further purification of the water quality, and the baffle 2 31 is used to isolate the pipe part connected to the water pipe 30 to prevent the water flow from directly interfering with the filtration area; the filter box 4 4 enters the water body through the fine filter screen 21 Fine filtration is performed to completely remove tiny particles to ensure clear water quality. At the same time, the baffle 2 31 continues to isolate the external interference caused by the water pipe 30 and optimize the water flow distribution; the filter box 3 3 realizes the adsorption of dissolved organic matter in the water body through the biological filtration layer 28 and the activated carbon layer 29, and decomposes ammonia nitrogen and other harmful substances through nitrifying bacteria to further purify the water quality, and the purified water is discharged from the water outlet flange 2 16; the collection component is composed of a dissolved oxygen sensor 23, a PH sensor 24, an ammonia nitrogen sensor 25 and a turbidity sensor 26, which are evenly arranged in each filter box for real-time monitoring of water parameters and transmitting data through the monitoring module in the central control system; the central control system analysis module processes the data to regulate the operation of the high-pressure pump 9, the electronic valve 1 14 and the electronic valve 2 15, so as to realize intelligent adjustment of the water flow and the filtering frequency;

[0060] During the filtering process, the central control system switches the state of the electronic valve, closes the normal filtering path, and supplies water to the filter tube 17 in the reverse direction through the high-pressure pump 9. The backwashing water flows from the drainage hole 22 of the filter tube 17 to the surface of the filter screen 21 to wash away the attached impurities and particles; the impurities and the backwashing wastewater are introduced into the sedimentation tank 8 through the drainage pipe 32, and the solid impurities are deposited in the sedimentation tank 8 and discharged through the water outlet flange 17; after the backwashing is completed, the central control system switches the electronic valve 14 and the electronic valve 2 15, restores the normal filtering path, and the device continues to purify the water body;

[0061] The ultraviolet sterilizer 10 sterilizes and disinfects the filtered water, and the water suction pump 13 returns the purified water to the breeding system; each filter box facilitates the installation and removal of the filter tube 17 through the top mounting hole 19, and the rubber ring 20 provides a sealing effect to ensure the stable operation of the device; the support leg 11 provides structural stability for the device, and the L fixing plate 1 5 and the L fixing plate 2 6 are connected and fixed to each filter box by bolts to ensure the safe and reliable operation of the device.

[0062] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-layer graded filtration device for circulating aquaculture, characterized in that: include: A filter box (1) for removing large particles of impurities from the water; Filter box two (2), for absorbing dissolved organic matter in water; Filter box three (3), for deep filtering of water; Filter box four (4), for further removing suspended particles and fine impurities; The filter boxes are each provided with a collection component, and the filter box one (1), the filter box three (3) and the filter box four (4) are each provided with a filter component of different precisions.

2. The multi-layer graded filtration device for circulating aquaculture according to claim 1, characterized in that: The filter assembly comprises a filter tube (17), the filter tube (17) being equidistantly arranged inside the filter box one (1), the filter box three (3) and the filter box four (4), the filter tube (17) being provided with a filter screen (21) outside, and the filter screens (21) are respectively a coarse filter screen, a medium filter screen and a fine filter screen, and the coarse filter screen, the medium filter screen and the fine filter screen are respectively arranged inside the filter box one (1), the filter box three (3) and the filter box four (4), the filter tube (17) being provided with drainage holes (22) at equidistant intervals outside, the filter box one (1) being provided with a plurality of water inlet flanges (12), and the inner top wall of the filter box one (1) being provided with a baffle plate one (27).

3. The multi-layer graded filtration device for circulating aquaculture according to claim 1, characterized in that: The interior of the second filter box (2) is respectively provided with a biological filtration layer (28) and an activated carbon layer (29), and a plurality of water outlet flanges (16) are equidistantly arranged on the rear side of the second filter box (2).

4. The multi-layer graded filtration device for circulating aquaculture according to claim 1, characterized in that: The collection component comprises a dissolved oxygen sensor (23), a pH sensor (24), an ammonia nitrogen sensor (25) and a turbidity sensor (26); the dissolved oxygen sensor (23), the pH sensor (24), the ammonia nitrogen sensor (25) and the turbidity sensor (26) are all arranged on the inner walls of the filter box one (1), the filter box two (2), the filter box three (3) and the filter box four (4); and the dissolved oxygen sensor (23), the pH sensor (24), the ammonia nitrogen sensor (25) and the turbidity sensor (26) are arranged at a certain interval; the dissolved oxygen sensor (23), the pH sensor (24), the ammonia nitrogen sensor (25) and the turbidity sensor (26) transmit the collected data to a central control system.

5. The multi-layer graded filtration device for circulating aquaculture according to claim 2, characterized in that: The filter box 1 (1), the filter box 3 (3) and the filter box 4 (4) are each provided with a baffle plate 2 (31), and an interlayer is provided between the baffle plate 2 (31) and the inner wall of the filter box 1 (1), the filter box 3 (3) and the filter box 4 (4). The filter tubes (17) are each connected to the water pipe (30) through a pipeline, and the water pipes (30) are connected to the output end of the high-pressure pump (9) through a pipeline, and the high-pressure pump (9) is provided in the filter box 2. (2), the outer side of the water delivery pipe (30) is provided with an electronic valve one (14), the outer sides of the filter box one (1), the filter box three (3) and the filter box four (4) are connected to the water inlet of the sedimentation box (8) through the pipeline drainage pipe (32), and the sedimentation box (8) is arranged on the outer side of the filter box two (2), the outer side of the sedimentation box (8) is provided with a water outlet flange one (7), and each connecting pipe of the drainage pipe (32) is provided with an electronic valve two (15).

6. The multi-layer graded filtration device for circulating aquaculture according to claim 2, characterized in that: The tops of the filter box 2 (2), the filter box 3 (3) and the filter box 4 (4) are all provided with a plurality of mounting holes (19) at equal distances, the inner sides of the mounting holes (19) are all provided with an annular groove (18), the inner sides of the annular groove (18) are provided with a rubber ring (20), the lower ends of the filter tubes (17) are all engaged with the mounting holes (19), and the outer diameter of the filter tubes (17) is in contact with the rubber ring (20), and the outer diameter of the rubber ring (20) is larger than the inner diameter of the annular groove (18).

7. The multi-layer graded filtration device for circulating aquaculture according to claim 1, characterized in that: A plurality of water suction pumps (13) are equidistantly arranged on the top of the filter box one (1), and an electronic valve one (14) is arranged at the output end of each of the water suction pumps (13). A plurality of ultraviolet sterilizers (10) are equidistantly arranged on the rear side of the filter box three (3), and the water inlet of the ultraviolet sterilizer (10) is connected to the water outlet flange two (16), and the water outlet of the ultraviolet sterilizer (10) is connected to the input end of the water suction pump (13) through a pipeline.

8. The multi-layer graded filtration device for circulating aquaculture according to claim 1, characterized in that: The four outer corners of the filter box one (1) are provided with L fixing plates two (6), the four outer corners of the filter box three (3) and the filter box four (4) are provided with L fixing plates one (5) and L fixing plates two (6) at equal distances, the four outer corners of the filter box two (2) are provided with L fixing plates one (5), and the L fixing plates one (5) and L fixing plates two (6) are connected by bolts.

9. The multi-layer graded filtration device for circulating aquaculture according to claim 1, characterized in that: The four corners of the bottom of the second filter box (2) and the sedimentation box (8) are all provided with support legs (11), and the support legs (11) are distributed at equal intervals.

10. The multi-layer graded filtration device for circulating aquaculture according to claim 4, characterized in that: The central control system comprises: Monitoring module: used for transmitting data collected by the dissolved oxygen sensor (23), the pH sensor (24), the ammonia nitrogen sensor (25) and the turbidity sensor (26) to the central control system; Analysis module: It analyzes the data collected in the central control system through the data processing unit.

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