A circulating water treatment device and method for high-density fish farming

Abstract

The application provides a circulating water treatment device and method for high-density fish culture, and belongs to the technical field of fish culture; the device comprises a fish culture cylinder, a filter assembly is arranged in the inside of the fish culture cylinder and is used for circulating and filtering water in the inside of the fish culture cylinder, the filter assembly comprises a first filter cylinder and a second filter cylinder which are installed in the middle part of the inside of the fish culture cylinder and an annular pipe which is fixedly connected to the outside of the fish culture cylinder, and the first filter cylinder is located in the inside of the second filter cylinder. The filter assembly is arranged, the first filter cylinder and the second filter cylinder are arranged in the middle part of the inside of the fish culture cylinder, a filter bag is arranged between the first filter cylinder and the second filter cylinder, a coaxial nesting structure is formed, and the bottom water suction pipe and the external annular pipe are combined, so that the internal circulating filtration of water bodies is realized. Compared with the existing technology, the device can solve the problems of easy blockage, uneven flow rate and many dead angles of the body, significantly improves the filtration efficiency and the water body renewal uniformity, and avoids the phenomenon that small fish are sucked in.

Description

Technical Field

[0001] This invention relates to the field of fish farming technology, and in particular to a recirculating water treatment device and method for high-density fish farming. Background Technology

[0002] In modern aquaculture, especially in high-density recirculating aquaculture systems, water quality control and recirculation purification technologies are key to ensuring aquaculture efficiency and fish health. To maintain a good aquatic environment, filtration devices are usually used to remove impurities, suspended solids, uneaten feed, and excrement from the water in a timely manner. At the same time, the uniformity and activity of the water are maintained through circulation to prevent local water quality deterioration. Against this backdrop, various recirculating water treatment equipment has been widely developed and applied. Its core objective is to achieve efficient purification and reuse of aquaculture water under the condition of continuous replenishment of insufficient new water resources, thereby achieving the goals of water conservation, consumption reduction, and increased output.

[0003] However, most existing circulating water filtration equipment uses a method of placing the filter components and circulation devices outside the breeding tank or trough. Water is drawn out from the inside by a water pump or pumping mechanism, filtered externally, and then returned to the breeding environment. Although this structure has a certain purification effect, it has significant drawbacks in actual use: First, to avoid accidentally sucking fish, the connection port of the external water pipe is usually designed with a small aperture. This not only makes the water pipe easy to be blocked by fish excrement and uneaten food, thus increasing the cleaning frequency, but also easily leads to poor water circulation. Second, if the aperture of the water pipe connection port is increased, it is not possible to effectively prevent small fish from being sucked out, thus affecting the safety of breeding. Third, the external circulation path is long, resulting in water pressure attenuation and uneven water flow, which can easily form stagnant water areas. In addition, the external equipment is complicated to install, occupies a lot of space, and has high maintenance costs, which is not conducive to its widespread use in small and medium-sized aquaculture farms. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a circulating water treatment device and method for high-density fish farming to solve the problems of low filtration efficiency, uneven water renewal, easy clogging and complicated maintenance of existing circulating water filtration equipment, which are difficult to meet the actual needs of high-efficiency aquaculture.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A recirculating water treatment device for high-density fish farming includes a fish tank. Inside the fish tank is a filtration assembly for circulating and filtering the water. The filtration assembly includes a first filter cylinder and a second filter cylinder installed in the middle of the fish tank, and an annular pipe fixedly connected to the outside of the fish tank. The first filter cylinder is located inside the second filter cylinder. A filter bag is installed between the first and second filter cylinders. Multiple conveying pipes are connected to one side of the annular pipe, and the output end of the conveying pipes is connected to the side wall of the fish tank. Inside the fish tank is a cleaning assembly for cleaning the inner wall of the fish tank and the side wall of the filter cylinder. Inside the fish tank is a cleaning assembly for cleaning the bottom of the fish tank and conveying fish waste out. The cleaning assembly and the cleaning assembly work together to remove impurities inside the fish tank. Furthermore, the cleaning assembly and the cleaning assembly work in conjunction with the filtration assembly to improve the filtration effect.

[0007] Preferably, a fixed column is fixedly connected to the bottom of the fish tank, a first conical cylinder is fixedly connected to the top of the fixed column, a guide ring is fixedly connected to the top of the first conical cylinder, a conveying cylinder is fixedly connected to the middle of the top of the first conical cylinder, a second conical cylinder is fixedly connected to the outside of the conveying cylinder, and the first filter cylinder, the second filter cylinder, and the filter bag are fixedly connected to the middle of the top of the second conical cylinder.

[0008] Preferably, the top of the second conical cylinder is connected to a water pumping pipe, the input end of which is located at the bottom of the first filter cylinder, and the output end of which passes through the interior of the first conical cylinder and the side wall of the fish tank and is connected to a water pump. The output end of the water pump is connected to a water delivery pipe, and the output end of the water delivery pipe is connected to one end of an annular pipe. Multiple delivery pipes are arranged in an annular pattern at equal intervals on the side wall of the fish tank, and the position of the output end of the delivery pipe is flush with the inner wall of the fish tank, and the water level inside the fish tank is higher than the output end of the delivery pipe.

[0009] Preferably, the cleaning assembly includes a third brush rod, a first brush rod, and a second brush rod installed inside the fish tank. The brush on one side of the second brush rod contacts the inner wall of the first filter cylinder, and the brush on one side of the first brush rod contacts the outer wall of the second filter cylinder. A sleeve plate is fixedly connected to one side of the third brush rod, and the brush on one side of the third brush rod contacts the inner wall of the fish tank. The top ends of the sleeve plate, the first brush rod, and the second brush rod are connected by a connecting plate.

[0010] Preferably, a fixed frame is fixedly connected to the top of the fish tank. The fixed frame is U-shaped. An upper limit cylinder is fixedly connected to the end of the fixed frame away from the fish tank. A connecting frame is fixedly connected inside the upper limit cylinder. A lower limit cylinder is fixedly connected to the bottom of the connecting frame. A wave groove is provided between the upper limit cylinder and the lower limit cylinder. A motor is fixedly connected to the middle of the lower limit cylinder. A connecting shaft is fixedly connected to the output end of the motor through the bottom of the lower limit cylinder. A connecting rod is fixedly connected to the outside of the connecting shaft. A connecting rod is slidably engaged with the connecting rod at the end away from the connecting shaft by a collar. A connecting plate is fixedly connected to one side of the bottom end of the connecting rod. A pad is fixedly connected to the bottom of the connecting plate at the end away from the connecting rod. The bottom of the pad is fixedly connected to the top of the sleeve plate.

[0011] Preferably, a wave groove is provided between the side walls of the upper limit cylinder and the lower limit cylinder, and a sliding rod is slidably connected inside the wave groove. The end of the sliding rod away from the wave groove is fixedly connected to one side of the top of the connecting rod. When the sliding rod moves to the lowest point of the wave groove, the first brush rod and the second brush rod move to the lowest point of the first filter cylinder and the second filter cylinder.

[0012] Preferably, the cleaning assembly includes a spiral column rotatably connected inside the conveying cylinder. The outer wall of the spiral column contacts the inner wall of the conveying cylinder. The top of the spiral column is fixedly connected to the bottom end of the motor bottom connecting shaft. An inlet is provided on one side of the bottom of the conveying cylinder, and an outlet is provided on one side of the top of the conveying cylinder. The outlet of the top of the conveying cylinder is located between the connecting rod and the connecting plate. An output plate is fixedly connected to one side of the top of the conveying cylinder by a support frame. The end of the output plate away from the conveying cylinder extends outside the fish tank. The top of one end of the output plate is located at the bottom of the outlet of the top of the conveying cylinder. The output plate and the support frame are located between the connecting rod and the connecting plate. The output plate has multiple holes inside. The holes inside the output plate are located between the inner wall of the fish tank and the outer wall of the second filter cylinder.

[0013] Preferably, the guide ring is in the shape of a conical ring, and a leakage hole is provided between the lowest point of the second conical cylinder and the lowest point of the guide ring. A telescopic plate is slidably engaged inside the bottom of the sleeve plate, and a V-shaped plate is fixedly connected to the bottom of the telescopic plate. The bottoms of both ends of the V-shaped plate are in contact with the tops of the second conical cylinder and the guide ring, respectively, and a gap is left between one end of the V-shaped plate and the second filter cylinder.

[0014] Preferably, the first conical cylinder has an inverted cone shape, a block-clearing block is fixedly connected to the bottom of the middle part of the V-shaped plate, the outside of the block-clearing block is slidably connected to the inside of the leakage hole, a scraper is fixedly connected to the bottom of the leakage hole, a rubber strip is fixedly connected to the end of the scraper away from the block-clearing block, the bottom of the rubber strip and the scraper are in contact with the top of the first conical cylinder, and the rubber strip bends when it contacts the outside of the pumping pipe.

[0015] A recirculating water treatment method for high-density fish farming, using the aforementioned recirculating water treatment device for high-density fish farming, includes the following steps:

[0016] S1: Initially, the fish tank is filled with relatively clean filtered water. Therefore, when the water pump is started, the filtered water inside the first filter cylinder is first pumped into the annular pipe. Since the annular pipe is arranged in a ring shape and connected to multiple evenly distributed delivery pipes, these delivery pipes face the inner wall of the fish tank. Through the annular water injection structure formed by the annular pipe and delivery pipes, clean water is sprayed from the inner wall of the fish tank to the center, forming a multi-point directional impact water flow, which drives the impurities in the tank to converge towards the center of the fish tank.

[0017] S2: Finally, the impurities in the water flow through the first filter cartridge, the second filter cartridge, and the filter bag, achieving impurity blocking and water purification. The filtered water re-enters the interior of the first filter cartridge, replacing the original filtered water, forming an internal cycle of "extraction-injection-impact-filtration-recirculation".

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] In the above solution, a filtration assembly is set up, consisting of a first filter cylinder and a second filter cylinder located in the middle of the fish tank. A filter bag is installed between the two, forming a coaxial nested structure. Combined with a bottom water pumping pipe and an external annular pipe, internal circulation filtration of the water is achieved. A water pump draws the clean water in the first filter cylinder into the annular pipe, and then re-injects it through a delivery pipe evenly distributed on the inner wall of the fish tank, forming a multi-point impact water flow from the cylinder wall to the middle. This continuously pushes the surrounding sewage towards the filter bag to refresh it, prompting the filter bag to continuously purify the water. At the same time, it achieves dynamic replacement of the clean water inside the first filter cylinder, thus forming a closed and efficient internal circulation purification path. Compared with the problems of easy clogging of external water pipes, uneven flow rate, and many dead corners in the body of the existing technology, this device significantly improves filtration efficiency and water renewal uniformity, and avoids phenomena such as small fish being sucked in.

[0020] By incorporating a cleaning assembly, including multiple brush rod structures, which act on the inner wall of the first filter cylinder, the outer wall of the second filter cylinder, and the inner wall of the fish tank, and driven by a linkage plate, the assembly can move up and down during cleaning. Through the continuous contact between the brush structure fixed on the brush rod and the cylinder wall, it effectively removes impurities such as fish feces and sticky biofilms adhering to the surface of each cylinder wall, preventing dirt accumulation or clogging on the surface of the filter assembly. Compared with existing technologies where filter equipment requires frequent maintenance and cleaning relies on manual labor, this cleaning assembly can operate automatically in conjunction with a motor drive, achieving automatic cleaning, reducing the burden of manual maintenance, and extending the service life of the equipment. It effectively solves the technical problems of inconvenient cleaning and low efficiency in existing structures.

[0021] By incorporating a cleaning component located at the bottom of the fish tank, consisting of a spiral column, conveying cylinder, output plate, and V-shaped plate, and linked with the cleaning assembly, this system provides scraping, conveying, and discharge functions. Fish waste and impurities deposited at the bottom during fish farming are propelled by the rotating spiral column, entering the conveying cylinder through the inlet and exiting through the output plate. A porous structure below the output plate filters water as it discharges fish waste and impurities, preventing continuous water overflow from the fish tank. The specially designed V-shaped plate, along with the unblocking block and scraper structure, ensures unobstructed flow and debris removal at the bottom, effectively preventing blockages in the bottom sedimentation area. Additionally, a rubber strip bends upon contact with the outside of the suction pipe during scraper movement, allowing the scraper to pass over the outside of the pipe and preventing interference. Compared to traditional external suction sewage discharge devices, this structure precisely and efficiently removes fish waste and heavy debris, preventing small fish from being sucked away and improving the stability and cleaning efficiency of the aquaculture environment. Attached Figure Description

[0022] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the present disclosure and, together with the specification, further serve to explain the principles of the present disclosure and enable those skilled in the art to implement and use the present disclosure.

[0023] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the internal structure of the fish tank of the present invention;

[0025] Figure 3 This is a schematic diagram of the top cross-sectional structure of the fish tank of the present invention;

[0026] Figure 4 This is a schematic diagram of the bottom cross-sectional structure of the fish tank of the present invention;

[0027] Figure 5 This is a schematic diagram of the wave groove structure of the present invention;

[0028] Figure 6 This is an enlarged structural diagram of the V-shaped plate and scraper of the present invention;

[0029] Figure 7 This is an enlarged structural diagram of the pad and sleeve of the present invention;

[0030] Figure 8 This is a schematic diagram demonstrating the connection rod of the present invention rotating to one end of the output plate;

[0031] Figure 9 This is a schematic diagram demonstrating the connection rod of the present invention rotating to one side of the fixed frame.

[0032] [Figure Labels]

[0033] 1. Fish tank; 2. Fixing column; 3. First conical cylinder; 4. Conveying cylinder; 5. Second conical cylinder; 6. Guide ring; 7. First filter cylinder; 8. Second filter cylinder; 9. Filter bag; 10. Spiral column; 11. Fixing frame; 12. Upper limit cylinder; 13. Connecting frame; 14. Lower limit cylinder; 15. Wave groove; 16. Motor; 17. Slide rod; 18. Connecting rod; 19. Linking rod; 20. Connecting plate; 21. Pad block; 22. Linking plate; 23. First brush rod; 24. Second brush rod; 25. Sleeve plate; 26. Telescopic plate; 27. Third brush rod; 28. V-shaped plate; 29. ​​Unblocking block; 30. Scraper; 31. Rubber strip; 32. Inlet; 33. Output plate; 34. Water suction pipe; 35. Water pump; 36. Water delivery pipe; 37. Ring pipe; 38. Conveying pipe; 39. Leakage hole.

[0034] As shown in the figure, specific structures and devices are labeled in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs, and such adjustments or modifications are still included in the scope of the appended claims. Detailed Implementation

[0035] The following is a detailed description of a recirculating water treatment device and method for high-density fish farming provided by the present invention, with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments; those skilled in the art can also use other alternative methods to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0036] like Figures 1 to 9As shown, an embodiment of the present invention provides a recirculating water treatment device for high-density fish farming, including a fish tank 1. The fish tank 1 is equipped with a filter assembly for circulating and filtering the water inside the fish tank 1. The filter assembly includes a first filter cylinder 7 and a second filter cylinder 8 installed in the middle of the fish tank 1, and an annular pipe 37 fixedly connected to the outside of the fish tank 1. The first filter cylinder 7 is located inside the second filter cylinder 8, and a filter bag 9 is installed between the first filter cylinder 7 and the second filter cylinder 8. Multiple conveying pipes 38 are connected to one side of the annular pipe 37, and the output end of the conveying pipes 38 is connected to the side wall of the fish tank 1. The fish tank 1 is equipped with a cleaning assembly for cleaning the inner wall of the fish tank 1 and the side wall of the filter cylinders. The fish tank 1 is also equipped with a cleaning assembly for cleaning the bottom of the fish tank 1 and conveying fish waste out of the fish tank 1. The cleaning assembly and the cleaning assembly work together to clean impurities inside the fish tank 1. Simultaneously, the cleaning assembly and the cleaning assembly work in conjunction with the filter assembly to improve the filtration effect.

[0037] The filter assembly consists of a first filter cylinder 7 and a second filter cylinder 8 located in the middle of the fish tank 1, with a filter bag 9 between them, forming a coaxial nested structure. Combined with the bottom water pumping pipe 34 and the external annular pipe 37, internal circulation filtration of the water is achieved. The water pump 35 draws the clean water from the first filter cylinder 7 into the annular pipe 37, and then re-injects it through the delivery pipes 38 evenly distributed on the inner wall of the fish tank 1, forming a multi-point impact water flow from the cylinder wall to the middle, continuously pushing the surrounding sewage towards the filter bag 9 to refresh the water, prompting the filter bag 9 to continuously purify the water, and at the same time realizing the dynamic replacement of the clean water inside the first filter cylinder 7, thus forming a closed and efficient internal circulation purification path. Compared with the problems of easy clogging of external water pipes, uneven flow rate, and many dead corners in the body of the existing technology, this device significantly improves the filtration efficiency and water renewal uniformity, and avoids the phenomenon of small fish being sucked in.

[0038] like Figures 1 to 4As shown, a fixed column 2 is fixedly connected to the bottom of the fish tank 1. A first conical cylinder 3 is fixedly connected to the top of the fixed column 2. A guide ring 6 is fixedly connected to the top of the first conical cylinder 3. A conveying cylinder 4 is fixedly connected to the middle of the top of the first conical cylinder 3. A second conical cylinder 5 is fixedly connected to the outside of the conveying cylinder 4. A first filter cylinder 7, a second filter cylinder 8, and a filter bag 9 are fixedly connected to the middle of the top of the second conical cylinder 5. A water suction pipe 34 is connected to the top of the second conical cylinder 5. The input of the water suction pipe 34... The end is located at the bottom inside the first filter cylinder 7. The output end of the water pump 34 passes through the inside of the first conical cylinder 3 and the side wall of the fish tank 1 and is connected to the water pump 35. The output end of the water pump 35 is connected to the water delivery pipe 36. The output end of the water delivery pipe 36 is connected to one end of the annular pipe 37. Multiple delivery pipes 38 are arranged in a ring at equal intervals on the side wall of the fish tank 1. The position of the output end of the delivery pipe 38 is flush with the inner wall of the fish tank 1, and the water level inside the fish tank 1 is higher than the output end of the delivery pipe 38.

[0039] With the first filter cylinder 7, the second filter cylinder 8, and the filter bag 9 configured, the fish tank 1 is initially filled with relatively clean filtered water. Therefore, when the water pump 35 is started, the filtered water inside the first filter cylinder 7 is first drawn into the annular pipe 37. Since the annular pipe 37 is arranged in a ring shape and connected to multiple evenly distributed delivery pipes 38, which face the inner wall of the fish tank 1, clean water is sprayed from the inner wall of the fish tank 1 towards the center through the annular water injection structure formed by the annular pipe 37 and the delivery pipes 38. This creates a multi-point directional impact water flow, which drives the impurities in the tank to converge towards the center of the fish tank 1. During this flow, the impurities pass through the first filter cylinder 7, the second filter cylinder 8, and the filter bag 9, achieving impurity blocking and water purification. The filtered water then re-enters the interior of the first filter cylinder 7, replacing the original filtered water, forming... The internal circulation process of "extraction-injection-impact-filtration-recirculation" is continuous, constantly renewing and purifying the water inside the fish tank 1, preventing the accumulation of dirt in dead corners, and effectively improving the overall filtration efficiency and water cleanliness. In addition, to enhance the filtration effect, the filter bag 9 can be filled with porous filter media such as filter cotton, activated carbon, bio-balls, or ceramic rings. These fillers have strong adsorption and retention capabilities, which can further adsorb suspended particles, impurities, and some harmful substances in the water, enhancing the physical filtration and some biological purification effects, thereby improving the quality of the effluent. At the same time, by setting the position of the delivery pipe 38, abundant bubbles will be generated on the water surface when water is delivered through the delivery pipe 38. These bubbles can help stir the water and strengthen the water convection inside the tank. At the same time, the rising of the bubbles also has a certain oxygenation effect, which is conducive to increasing the dissolved oxygen level in the water and further improving the aquatic environment.

[0040] like Figures 1 to 9As shown, the cleaning assembly includes a third brush rod 27, a first brush rod 23, and a second brush rod 24 installed inside the fish tank 1. The brush on one side of the second brush rod 24 contacts the inner wall of the first filter cylinder 7, and the brush on one side of the first brush rod 23 contacts the outer wall of the second filter cylinder 8. A sleeve plate 25 is fixedly connected to one side of the third brush rod 27, and the brush on one side of the third brush rod 27 contacts the inner wall of the fish tank 1. The top ends of the sleeve plate 25, the first brush rod 23, and the second brush rod 24 are connected by a connecting plate 22.

[0041] The cleaning assembly, including multiple brush rod structures, acts on the inner wall of the first filter cylinder 7, the outer wall of the second filter cylinder 8, and the inner wall of the fish tank 1, respectively. Driven by the linkage plate 22, it can move up and down during the cleaning process. Through the brush structure fixed on the brush rod, it continuously contacts the cylinder wall, effectively removing impurities such as fish feces and sticky biofilms attached to the surface of each cylinder wall, preventing dirt accumulation or clogging on the surface of the filter assembly. Compared with the existing technology where filter equipment requires frequent maintenance and cleaning depends on manual labor, this cleaning assembly can be driven by the motor 16 to operate automatically, achieving automatic cleaning, reducing the burden of manual maintenance, and extending the service life of the equipment. It effectively solves the technical problems of inconvenient cleaning and low efficiency of the existing structure.

[0042] like Figures 1 to 9 As shown, a fixed frame 11 is fixedly connected to the top of the fish tank 1. The fixed frame 11 is U-shaped. An upper limit cylinder 12 is fixedly connected to the end of the fixed frame 11 away from the fish tank 1. A connecting frame 13 is fixedly connected inside the upper limit cylinder 12. A lower limit cylinder 14 is fixedly connected to the bottom of the connecting frame 13. A wave groove 15 is provided between the upper limit cylinder 12 and the lower limit cylinder 14. A motor 16 is fixedly connected to the middle of the lower limit cylinder 14. A connecting shaft is fixedly connected to the bottom of the lower limit cylinder 14 through the output end of the motor 16. A connecting rod 19 is fixedly connected to the outside of the connecting shaft. A connecting rod 18 is slidably engaged at the end of the connecting rod 19 away from the connecting shaft through a collar. A connecting plate 20 is fixedly connected to one side of the bottom end of the connecting rod 18. A pad 21 is fixedly connected to the bottom of the end of the connecting plate 20 away from the connecting rod 18. The bottom of the pad 21 is fixedly connected to the top of the sleeve plate 25.

[0043] During cleaning, the motor 16 and connecting rod 19 are activated, causing the connecting shaft of the motor 16 to rotate the connecting rod 19. Simultaneously, the connecting rod 19 moves the connecting rod 18, which in turn moves the connecting plate 20 and the connecting plate 22. At the same time, the second brush rod 24, the first brush rod 23, and the sleeve plate 25, carrying the brushes, clean the inner wall of the first filter cylinder 7, the outer wall of the second filter cylinder 8, and the inner wall of the fish tank 1. This process causes the brushes to clean the first filter cylinder 7, the second filter cylinder 8, and the fish tank 1. The impurities on the side wall of cylinder 1 are cleaned, thus ensuring the water filtration and circulation within the fish tank. It should be noted that the first filter cylinder 7, being the innermost part, rarely retains impurities. However, over time, a small amount of fine impurities may appear inside. These are cleaned by the second brush rod 24, then extracted through the suction pipe 34 and reintroduced between fish tank 1 and the second filter cylinder 8 for re-filtration. This ensures that the water inside the first filter cylinder 7 remains clean for an extended period. Furthermore, the placement of the pads 21, such as... Figure 8 As shown, by raising the height of the connecting plate 20, the connecting plate 20, along with the connecting rod 18, extends beyond the fish tank 1, thus preventing the output plate 33 from affecting the movement of the connecting plate 20 and the connecting rod 19. Simultaneously, by setting the fixing bracket 11 to a U-shape, as... Figure 9 As shown, when the connecting rod 18 rotates to one side of the fixing frame 11, the fixing frame 11 can avoid the problem of obstructing the movement of the connecting rod 18.

[0044] like Figure 1 and Figure 9 As shown, a wave groove 15 is provided between the side walls of the upper limit cylinder 12 and the lower limit cylinder 14. A slide rod 17 is slidably connected inside the wave groove 15. The end of the slide rod 17 away from the wave groove 15 is fixedly connected to one side of the top of the connecting rod 18. When the slide rod 17 moves to the lowest point of the wave groove 15, the first brush rod 23 and the second brush rod 24 move to the lowest point of the first filter cylinder 7 and the second filter cylinder 8.

[0045] With the wave groove 15 in place, when the connecting rod 19 moves, the sliding rod 17 will move inside the wave groove 15, thereby causing the sliding rod 17 to move up and down along the trajectory of the wave groove 15 with the connecting rod 18. At this time, since one end of the connecting rod 19 is slidably connected to the outside of the connecting rod 18 through a collar, it not only ensures the movement of the connecting rod 18, but also enables the connecting rod 18 to move up and down. When the connecting rod 18 moves up and down, the connecting plate 20 will move up and down with the sleeve plate 25, the first brush rod 23 and the second brush rod 24 through the connecting plate 22, thereby making the first filter cylinder 7, the second filter cylinder 8 and the side wall of the fish tank 1 cleaner.

[0046] like Figures 2 to 6As shown, the cleaning assembly includes a spiral column 10 rotatably connected inside the conveying cylinder 4. The outer wall of the spiral column 10 contacts the inner wall of the conveying cylinder 4. The top of the spiral column 10 is fixedly connected to the bottom end of the bottom connecting shaft of the motor 16. An inlet 32 ​​is provided on one side of the bottom of the conveying cylinder 4, and an outlet is provided on one side of the top of the conveying cylinder 4. The position of the top outlet of the conveying cylinder 4 is between the connecting rod 19 and the connecting plate 22. An output plate 33 is fixedly connected to one side of the top of the conveying cylinder 4 through a support frame. The end of the output plate 33 away from the conveying cylinder 4 extends out of the fish tank 1. The top of one end of the output plate 33 is located at the bottom of the top outlet of the conveying cylinder 4. The position of the output plate 33 and the support frame is between the connecting rod 19 and the connecting plate 22. The output plate 33 has multiple holes inside. The position of the holes inside the output plate 33 is between the inner wall of the fish tank 1 and the outer wall of the second filter cylinder 8.

[0047] The cleaning components, located at the bottom of the fish tank 1, consist of a spiral column 10, a conveying cylinder 4, an output plate 33, and a V-shaped plate 28. These components are linked with the cleaning assembly, providing scraping, conveying, and discharge functions. Fish feces and impurities deposited at the bottom during fish farming are propelled by the rotation of the spiral column 10, entering the conveying cylinder 4 through the inlet 32 ​​and exiting along the output plate 33. The output plate 33 has a porous structure below it, which filters water as fish feces and impurities are discharged, preventing water from continuously overflowing from the fish tank 1. The specially designed V-shaped plate 28, along with the unblocking block 29 and scraper 30, works in conjunction to ensure unobstructed flow and debris removal at the bottom, effectively preventing blockages in the bottom sedimentation area of ​​the fish tank 1. Compared to traditional external suction sewage discharge devices, this structure can accurately and efficiently remove fish feces and heavy debris, preventing small fish from being sucked away and improving the stability of the aquaculture environment and cleaning efficiency.

[0048] like Figures 2 to 6 As shown, the guide ring 6 is in the shape of a conical ring. A leakage hole 39 is provided between the lowest point of the second conical cylinder 5 and the lowest point of the guide ring 6. A telescopic plate 26 is slidably engaged inside the bottom of the sleeve plate 25. A V-shaped plate 28 is fixedly connected to the bottom of the telescopic plate 26. The bottoms of both ends of the V-shaped plate 28 are in contact with the tops of the second conical cylinder 5 and the guide ring 6, respectively, and a gap is left between one end of the V-shaped plate 28 and the second filter cylinder 8.

[0049] With the telescopic plate 26, V-shaped plate 28, and unblocking block 29 in place, when the third brush rod 27 moves, it moves along with the V-shaped plate 28 via the telescopic plate 26. At this time, the brush rod scrapes the impurities from the inner wall of the filter cylinder and fish tank 1 to the top of the second conical cylinder 5 and the guide ring 6. The V-shaped plate 28 then scrapes the impurities from the top of the guide ring 6 and the second conical cylinder 5, and simultaneously inputs them into the first conical cylinder 3 through the leakage hole 39, thus facilitating subsequent processing. At the same time, by setting the top of the telescopic plate 26 to slide inside the bottom of the sleeve plate 25, the telescopic plate 26 can both drive the V-shaped plate 28 to move and also cause the third brush rod 27 to move up and down. Furthermore, by setting the shape of the second conical cylinder 5 and the guide ring 6 to be conical, it is easy for impurities to be input into the leakage hole 39.

[0050] like Figures 2 to 6 As shown, the first conical cylinder 3 has an inverted cone shape. A block-clearing block 29 is fixedly connected to the bottom of the middle part of the V-shaped plate 28. The outside of the block-clearing block 29 is slidably connected to the inside of the leakage hole 39. A scraper 30 is fixedly connected to the bottom of the leakage hole 39. A rubber strip 31 is fixedly connected to the end of the scraper 30 away from the block-clearing block 29. The bottom of both the rubber strip 31 and the scraper 30 are in contact with the top of the first conical cylinder 3. The rubber strip 31 bends when it contacts the outside of the pumping pipe 34.

[0051] With the help of the clearing block 29, scraper 30, and rubber strip 31, when impurities at the top of the second conical cylinder 5 and the guide ring 6 are input into the interior of the first conical cylinder 3 through the impurity leakage hole 39, the V-shaped plate 28 is connected to one end of the scraper 30 via the clearing block 29. When the V-shaped plate 28 moves, the scraper 30 and rubber strip 31 will move accordingly, thereby causing the scraper 30 and rubber strip 31 to scrape away the impurities inside the first conical cylinder 3. At this time, by setting the shape of the first conical cylinder 3 as conical, the impurities are input to the outside of the bottom of the conveying cylinder 4, and then enter the interior of the conveying cylinder 4 through the inlet 32, and then enter the top of the conveying cylinder 4 through the spiral column 10. The water is discharged through the outlet and then through the output plate 33. At the same time, by setting holes inside the output plate 33, the water is filtered out when the fish feces and impurities are discharged through the output plate 33. This can avoid the problem of water constantly flowing out of the fish tank 1. It should also be noted that the output plate 33 is located at the bottom of the holes, where a filter screen can be hung. This allows for secondary filtration of the impurity water, preventing secondary pollution of the water. In addition, the rubber strip 31 can bend when it comes into contact with the outside of the water suction pipe 34 during the movement of the scraper 30, thereby causing the scraper 30 to move past the outside of the water suction pipe 34 and thus avoiding movement interference.

[0052] Embodiments of the present invention also provide a recirculating water treatment method for high-density fish farming, which, using the above-described recirculating water treatment device for high-density fish farming, includes the following steps:

[0053] S1: Initially, the fish tank 1 is filled with relatively clean filtered water. Therefore, when the water pump 35 is started, the filtered water inside the first filter cylinder 7 is first pumped into the annular pipe 37 by the water pump 35. Since the annular pipe 37 is arranged in an annular pattern and is connected to multiple evenly distributed conveying pipes 38, these conveying pipes 38 face the inner wall of the fish tank 1. Through the annular water injection structure formed by the annular pipe 37 and the conveying pipes 38, clean water is sprayed from the inner wall of the fish tank 1 to the center, forming a multi-point directional impact water flow, thereby driving the impurities in the tank to converge towards the center of the fish tank 1.

[0054] S2: Finally, the impurities in the water flow through the first filter cylinder 7, the second filter cylinder 8, and the filter bag 9, achieving impurity blocking and water purification. The filtered water re-enters the interior of the first filter cylinder 7, replacing the original filtered water, forming an internal cycle of "extraction-injection-impact-filtration-recirculation".

[0055] Compared to existing technologies, the above-mentioned recirculating water treatment method for high-density fish farming utilizes clean filtered water to initiate circulation in the initial stage. Combined with a ring-shaped water injection structure that sprays water from the inner wall of the fish tank 1 towards the center at multiple points, it effectively concentrates impurities towards the center, improving the efficiency of impurity aggregation. Subsequently, a multi-stage filtration structure (including a first filter cylinder 7, a second filter cylinder 8, and a filter bag 9) achieves layer-by-layer filtration and deep purification, effectively improving water quality. The entire process constructs a closed-loop circulation path of "extraction—injection—impact—filtration—recirculation," which not only avoids the intervention of external pollution but also achieves efficient and continuous purification of the water in the fish farming environment. This is beneficial for maintaining stable water quality, reducing water consumption, increasing farming density, and enhancing the sustainability and economic benefits of the farming system.

[0056] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details.

[0057] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A recirculating water treatment device for high-density fish farming, comprising a fish tank (1), characterized in that, The fish tank (1) is equipped with a filter assembly for circulating and filtering the water inside the fish tank (1). The filter assembly includes a first filter cylinder (7) and a second filter cylinder (8) installed in the middle of the fish tank (1) and an annular pipe (37) fixedly connected to the outside of the fish tank (1). The first filter cylinder (7) is located inside the second filter cylinder (8). A filter bag (9) is installed between the first filter cylinder (7) and the second filter cylinder (8). A plurality of conveying pipes (38) are connected to one side of the annular pipe (37). The output end of the conveying pipe (38) is connected to the side wall of the fish tank (1). The fish tank (1) is equipped with a cleaning component for cleaning the inner wall of the fish tank (1) and the side wall of the filter tube. The fish tank (1) is equipped with a cleaning component for cleaning the bottom of the fish tank (1) and for conveying the fish feces inside the fish tank (1). The cleaning component and the sweeping component are used in conjunction to clean the impurities inside the fish tank (1). At the same time, the cleaning component and the sweeping component are used in conjunction with the filter component to improve the filtration effect. The bottom of the fish tank (1) is fixedly connected to a fixed column (2), the top of the fixed column (2) is fixedly connected to a first conical cylinder (3) with an inverted cone shape, the top of the first conical cylinder (3) is fixedly connected to a guide ring (6) with a conical ring shape, the middle of the top of the first conical cylinder (3) is fixedly connected to a conveying cylinder (4), the outside of the conveying cylinder (4) is fixedly connected to a second conical cylinder (5), and the first filter cylinder (7), the second filter cylinder (8) and the filter bag (9) are fixedly connected to the middle of the top of the second conical cylinder (5). The top of the second conical cylinder (5) is connected to a water pumping pipe (34). The input end of the water pumping pipe (34) is located at the bottom of the first filter cylinder (7). The output end of the water pumping pipe (34) passes through the interior of the first conical cylinder (3) and the side wall of the fish tank (1) and is connected to a water pump (35). The output end of the water pump (35) is connected to the annular pipe (37) through a water delivery pipe (36). Multiple delivery pipes (38) are arranged in an annular pattern at equal intervals in the fish tank (1). The output end of the conveying pipe (38) is flush with the inner wall of the fish tank (1) and located below the water level line. The output direction of the conveying pipe (38) is set to spray the filtered water from the inner wall of the fish tank (1) to the middle of the fish tank (1), so as to drive the water in the fish tank (1) to gather and filter the first filter cylinder (7), the second filter cylinder (8) and the filter bag (9) located in the middle. The filtered water enters the interior of the first filter cylinder (7), thereby forming an internal circulation. The cleaning assembly includes a third brush rod (27), a first brush rod (23), and a second brush rod (24). The brush on one side of the second brush rod (24) contacts the inner wall of the first filter cylinder (7), the brush on one side of the first brush rod (23) contacts the outer wall of the second filter cylinder (8), and the brush on one side of the third brush rod (27) contacts the inner wall of the fish tank (1). A sleeve plate (25) is fixedly connected to one side of the third brush rod (27). The top ends of the sleeve plate (25), the first brush rod (23), and the second brush rod (24) are connected by a connecting plate (22). A fixing frame (11) is fixedly connected to the top of the fish tank (1). An upper limit cylinder (12) is fixedly connected to the end of the fixing frame (11) away from the fish tank (1). The interior of the upper limit cylinder (12) is fixed by a connecting frame (13). A lower limiting cylinder (14) is fixedly connected. A wave groove (15) is provided between the side walls of the upper limiting cylinder (12) and the lower limiting cylinder (14). A motor (16) is fixedly connected inside the lower limiting cylinder (14). The output end of the motor (16) passes through the bottom of the lower limiting cylinder (14) and is fixedly connected to a connecting shaft. A connecting rod (19) is fixedly connected to the outside of the connecting shaft. A connecting rod (18) is slidably engaged at the end of the connecting rod (19) away from the connecting shaft through a collar. A sliding rod (17) is fixedly connected to one side of the top of the connecting rod (18) and is slidably connected to the inside of the wave groove (15). A connecting plate (20) is fixedly connected to one side of the bottom of the connecting rod (18). The bottom of the connecting plate (20) away from the connecting rod (18) is fixedly connected to the top of the sleeve plate (25) through a pad (21). The cleaning assembly includes a spiral column (10) rotatably connected inside the conveying cylinder (4). The outer wall of the spiral column (10) is in contact with the inner wall of the conveying cylinder (4). The top of the spiral column (10) is fixedly connected to the bottom end of the bottom connecting shaft of the motor (16), so that the same motor (16) drives the cleaning assembly and the spiral column (10) simultaneously. An inlet (32) is provided on one side of the bottom of the conveying cylinder (4), and an outlet is provided on one side of the top. An output plate (33) is fixedly connected to one side of the top of the conveying cylinder (4) through a support frame. The end of the output plate (33) away from the conveying cylinder (4) extends out of the fish tank (1). Multiple holes are provided in the output plate (33), and the holes are located between the inner wall of the fish tank (1) and the outer wall of the second filter cylinder (8). A leakage hole (39) is provided between the lowest point of the second conical cylinder (5) and the lowest point of the guide ring (6). A telescopic plate (26) is slidably engaged inside the bottom of the sleeve plate (25). A V-shaped plate (28) is fixedly connected to the bottom of the telescopic plate (26). The bottoms of both ends of the V-shaped plate (28) are in contact with the tops of the second conical cylinder (5) and the guide ring (6), respectively. A gap is left between one end of the V-shaped plate (28) and the second filter cylinder (8). A cleaning block (29) that is slidably connected to the leakage hole (39) is fixedly connected to the bottom of the middle part of the V-shaped plate (28). The V-shaped plate (28) is linked to one end of the scraper (30) through the cleaning block (29). The bottom of the scraper (30) is in contact with the top of the first conical cylinder (3).

2. The recirculating water treatment device for high-density fish farming according to claim 1, characterized in that, The fixed frame (11) is U-shaped; the top outlet of the conveying cylinder (4) is located between the connecting rod (19) and the connecting plate (22), the top of one end of the output plate (33) is located at the bottom of the output outlet, and the output plate (33) and the support frame are located between the connecting rod (19) and the connecting plate (22); a rubber strip (31) is fixedly connected to the end of the scraper (30) away from the unblocking block (29), the bottom of the rubber strip (31) and the scraper (30) are in contact with the top of the first conical cylinder (3), and the rubber strip (31) bends when it contacts the outside of the pumping pipe (34).

3. A recirculating water treatment method for high-density fish farming, using the recirculating water treatment device for high-density fish farming as described in claim 1 or 2, characterized in that, Includes the following steps: S1: In the initial state, the fish tank (1) is filled with relatively clean filtered water. After the water pump (35) is started, the filtered water inside the first filter cylinder (7) is pumped into the ring pipe (37) by the water pump (35), and then sprayed from the inner wall of the fish tank (1) to the middle by multiple delivery pipes (38) evenly distributed on the side wall of the fish tank (1), forming a multi-point directional impact water flow, thereby driving the miscellaneous water in the tank to gather in the middle of the fish tank (1); S2: The impurities in the water flow through the first filter cylinder (7), the second filter cylinder (8) and the filter bag (9) to block impurities and purify the water. The filtered water re-enters the interior of the first filter cylinder (7) to form an internal cycle of "extraction-injection-impact-filtration-recirculation".

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