A pond structure for aquaculture

Abstract

The utility model relates to a pool structure for breeding belongs to the technical field of aquaculture facilities, including pool body, the middle part of pool body is provided with water whirl device, and water whirl device rotates at the interface of water body and outside air, is provided with a plurality of scraper for scraping water surface oil layer on water whirl device. The pool structure for breeding disclosed by the utility model can meet the use demand of oxygenation and oil film removal.

Description

Technical Field

[0001] This utility model relates to the technical field of aquaculture facilities, and in particular to a pond structure for aquaculture. Background Technology

[0002] In aquaculture, water quality management in the rearing ponds is a crucial factor determining the success or failure of the operation. Two common and challenging problems are insufficient dissolved oxygen and oil film formation on the water surface. Insufficient dissolved oxygen directly leads to slow fish growth, weakened immunity, and even large-scale mortality. Oil film, primarily composed of uneaten feed, fish excrement, and microbial metabolites, hinders gas exchange between the water and air, further exacerbating dissolved oxygen deterioration, and also affecting feeding observation and light penetration. Utility Model Content

[0003] In order to overcome the shortcomings of the existing technology, this utility model proposes a water tank structure for aquaculture that can meet the needs of oxygenation and oil film removal.

[0004] To achieve this objective, the present invention adopts the following technical solution: This utility model provides a pond structure for aquaculture, including a pond body, a water vortex is provided in the middle of the pond body, the water vortex rotates at the interface between the water body and the outside air, and a number of scrapers are provided on the water vortex for scraping off the oil layer on the water surface.

[0005] The preferred technical solution of this utility model is that the number of scrapers is 4 to 8, and they are arranged in a centrally symmetrical manner.

[0006] The preferred technical solution of this utility model is that the number of scrapers is 6.

[0007] The preferred technical solution of this utility model is that the shape of the scraper is such that its upper edge and lower edge are parallel to each other, and its side profile is an arc-shaped structure that gradually narrows from top to bottom.

[0008] The preferred technical solution of this utility model is that a vertical fixed pipe is fixedly installed in the middle of the pool body, and the vortex generator is rotatably sleeved on the fixed pipe.

[0009] The preferred technical solution of this utility model is that the wall of the fixed pipe has drainage holes at the upper and lower parts respectively, and the scraper of the vortex is arranged around the fixed pipe.

[0010] The preferred technical solution of this utility model is that a water outlet is provided at the edge of the pool body.

[0011] The preferred technical solution of this utility model is that the planar shape of the pool body is circular, square or regular octagonal.

[0012] The preferred technical solution of this utility model is that the material of the cyclone separator is polypropylene.

[0013] The beneficial effects of this utility model are: This invention proposes a pond structure for aquaculture. By installing a vortex generator in the middle of the original pond, which is designed to rotate at the interface between the water and the outside air, it creatively utilizes the energy of the pond's own drainage or circulating water as the sole power source, requiring no external motor or electrical input. Several scrapers on the vortex generator are used to remove the oil film from the water surface, thus achieving zero-energy operation for oxygenation and oil film removal. Simultaneously, it eliminates the risk of electric shock that might arise from electrical equipment entering the aquaculture area, achieving inherent safety. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a perspective view of a water tank structure for aquaculture according to Embodiment 1; Figure 2 This is a top view of a water tank structure for aquaculture according to Embodiment 1; Figure 3 for Figure 2 Sectional view along AA; Figure 4 This is a perspective view of the hydrocyclone of Example 1; Figure 5 This is a perspective view of the fixing tube in Example 1.

[0016] In the picture: 1-Pool body; 2-Swirl generator; 21-Scraper; 211-Upper edge of scraper; 212-Lower edge of scraper; 213-Arc-shaped structure; 3-Water body; 4-Outside air; 5-Fixed pipe; 51-Drain hole; 6-Outlet. Detailed Implementation

[0017] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0018] Example 1 like Figure 1-5As shown in the figure, this embodiment provides a pond structure for aquaculture, including a pond body 1. A vortex generator 2 is located in the middle of the pond body 1 and rotates at the interface between the water body 3 and the outside air 4. The vortex generator 2 is equipped with several scrapers 21 for scraping away the oil film on the water surface. The edge of the pond body 1 has a water inlet (omitted in the attached figure) for injecting water into the pond body 1. The water flowing through this inlet is filtered water from a filtration system. The technical solution of this embodiment achieves efficient oxygenation and oil film removal functions through an innovative aquaculture pond fluid interface treatment system. Its core lies in a vortex generator located in the middle of the pond body, rotating at the water-air interface, and several scrapers mounted on it. This system first directly treats the oil film on the water surface through the physical action of the scrapers. This oil film is mainly composed of a thin layer of organic matter formed by uneaten feed, fish excrement, etc., which is a key barrier preventing oxygen from dissolving into the water. Simultaneously, if the water is saturated with carbon dioxide, the presence of an oil film on the surface will affect the release of carbon dioxide, and even adding pure oxygen will make it difficult for oxygen to dissolve in the water. In this embodiment, when the hydrocyclone rotates on the water surface, the scraper on it can continuously scrape and tear the complete oil film layer and push the oil film particles to the edge of the pool using centrifugal force, thereby instantly exposing a large area of ​​clean water surface, which greatly reduces the interfacial resistance of gas-liquid exchange. This is beneficial for oxygenating the water and for releasing carbon dioxide in the water into the outside air.

[0019] Preferably, the number of scrapers 21 is 4 to 8, arranged in a centrally symmetrical manner. Limiting the number of scrapers to 4 to 8 and their centrally symmetrical arrangement is because this range and arrangement achieves the optimal balance between functional efficiency, operating energy consumption, and structural stability. "Centrally symmetrical arrangement" means that all scrapers are evenly distributed at equal angles around the central axis of rotation of the hydrocyclone. This symmetry ensures the dynamic balance of the hydrocyclone during rotation, resulting in smooth operation, low vibration, almost no noise, and extended equipment lifespan. From a functional perspective, the number of scrapers is a core parameter determining the continuity and uniformity of the oil film scraped from the water surface, as well as the characteristics of the resulting water flow field. If the number of scrapers is too small (e.g., less than 4), the scraping effect on the water surface during the rotation cycle is weakened. This not only leads to incomplete oil film removal and low efficiency but also results in an unstable and pulsating flow field, which may disturb fish and prevent the formation of a stable and smooth rotating flow field that effectively guides fish to gather towards the center. Conversely, if there are too many scrapers (e.g., more than 8), although the continuity of scraping theoretically increases, the small spacing between adjacent scrapers will cause water flow to be obstructed, and the water flow pushed by each scraper will interfere with each other, producing a serious "congestion" effect, which greatly increases rotational resistance. Therefore, through the inventor's experiments, the proven number range of 4 to 8 scrapers ensures that a sufficient number of scrapers act on the water surface simultaneously, achieving continuous, uniform, and efficient removal of the oil film, while also generating a sufficiently strong and stable rotating water flow to effectively drive the circulation of the entire pond and guide the fish.

[0020] Specifically, the number of scrapers 21 is 6. Within the preferred range of 4 to 8 scrapers, the number is further specifically limited to 6. They are evenly distributed around the central axis at a 60-degree angle. Compared to 4 or 5 scrapers, 6 scrapers further shorten the time interval between adjacent scrapers acting on the water surface, making the scraping action almost continuous, resulting in more thorough removal of the oil film with virtually no instantaneous omissions. Simultaneously, the resulting rotating flow field is smoother and more stable, with extremely low pulsation, providing fish with a gentler and more consistent directional water flow stimulus, thus more effectively inducing their tropism and causing them to smoothly gather towards the central area. Furthermore, from a manufacturing and structural rigidity perspective, the 6 scrapers form a stable symmetrical support structure on the cyclone separator bracket. Its overall mechanical strength is superior to schemes with fewer scrapers, while being easier to manufacture and ensure precision than schemes with more scrapers. This achieves the best balance of performance, energy consumption, and manufacturability, making it the most ideal implementation method verified through extensive simulations and in-pond tests.

[0021] Preferably, the scraper 21 has the following shape: its upper edge 211 and lower edge 212 are parallel to each other, and its side profile is an arc-shaped structure 213 that gradually narrows from top to bottom. This optimized scraper shape exhibits significant advantages in oil breaking, flow guidance, and energy consumption. The phrase "the upper and lower edges are parallel" means that the top edge (above the water-air interface) and the bottom edge (below the water-air interface) of the scraper are two parallel straight lines on the horizontal plane. This ensures that the scraper exerts a uniform force on the water throughout the entire water depth (at least within its effective operating depth), avoiding uneven force distribution caused by the tilt angle, thus stably scraping away the oil film throughout the entire operating depth and propelling the water flow. The "side profile is an arc-shaped structure that gradually narrows from top to bottom" greatly reduces the pressure drag and eddy current shedding experienced by the scraper when rotating in water. More importantly, this narrow, curved surface can very effectively guide water flow, generating not only a strong horizontal swirling flow but also a downward water flow component guided by the curved surface. This promotes vertical mixing of the surface oxygen-rich water with the middle and lower layers, achieving three-dimensional circulation and renewal of the entire pool's water. This is more efficient than a flat scraper that only generates horizontal flow. Therefore, this specifically shaped scraper not only fulfills the basic oil-scraping function but also optimizes hydrodynamic performance, becoming a core element for achieving efficient, low-consumption oxygenation and water flow drive.

[0022] Preferably, a vertical fixed pipe 5 is fixedly installed in the middle of the pool body 1, and the hydrocyclone 2 is rotatably sleeved on the fixed pipe 5. This preferred embodiment, with the vertical fixed pipe fixed in the middle of the pool body and the hydrocyclone rotatably sleeved on it, provides a stable, reliable, and functionally integrated central support and rotation solution for the entire system. The "fixed pipe" is vertically fixed at the center of the pool bottom and typically serves as the foundation structure for the central drainage pipe or sewage pipe of the pool. Its primary function is to act as the rotational central axis and load-bearing support structure for the hydrocyclone. By sleeved onto the fixed pipe using a bushing or bearing assembly located at the center of the hydrocyclone, the hydrocyclone can rotate smoothly around this stationary central axis. Compared to methods such as directly mounting the drive motor on the float or suspending it from the top of the pool via a long shaft, this design offers significant advantages: Firstly, the fixed pipe is rooted in the pool bottom, preventing swaying caused by water flow impact or component imbalance, ensuring the hydrocyclone always operates stably in its predetermined position. Secondly, this structure achieves structural integration, cleverly combining the hydrocyclone's support function with the pool's drainage and wastewater discharge functions onto the same fixed pipe component, simplifying the pool bottom layout and saving space and manufacturing costs. Furthermore, this centrally connected method naturally forms a structural core in the pool's central area, providing a structural foundation for subsequent fish protection measures around this core (such as deploying scrapers as a water flow barrier). Therefore, this fixed pipe connection scheme not only solves the hydrocyclone installation problem but also brings about a comprehensive improvement in overall structural rigidity, maintenance convenience, and functional integration.

[0023] Preferably, the fixed pipe 5 has drainage holes 51 at the upper and lower parts of its wall, and the scraper 21 of the vortex generator 2 is arranged around the fixed pipe 5. The upper drainage hole is usually used to drain surface water rich in floating matter such as oil film, while the lower drainage hole is used to drain sediment from the bottom of the pool, thus achieving efficient full-depth sewage discharge. By arranging the scraper of the vortex generator around the area of ​​the fixed pipe with drainage holes, when the water flow drives the vortex generator to rotate, the tightly surrounding scraper forms a rotating water flow barrier around the drainage holes. Since fish naturally like to swim upstream, they will gather at the fixed pipe. In the process, they may escape into the top opening of the fixed pipe. The surrounding scraper can prevent the fish from swimming close to the fixed pipe by rotating, achieving passive physical safety protection without additional energy. At the same time, this arrangement allows the rotating water flow generated by the scraper to act directly on the vicinity of the drainage holes, which is conducive to guiding floating matter on the water surface and sediment particles on the bottom of the pool to the drainage holes, improving sewage discharge efficiency.

[0024] Specifically, an outlet 6 is provided at the edge of the pool body 1. The water flowing from the outlet 6, along with the water flowing from the aforementioned drain hole 51, is treated by a filtration device and then repeatedly returned to the pool body. The water in the pool body, rich in uneaten food, fish excrement, and other metabolic products, is collected through the central drain hole and the pool wall outlets and uniformly transported to an external or internal filtration device. Here, "filtration device" is a broad functional unit, and its specific implementation may include physical filtration units (such as microfilters, drum filters, etc., for removing suspended solids), biological filtration units (such as biofilters, moving bed biofilm reactors, etc., for converting toxic ammonia nitrogen and nitrite into harmless nitrates), and necessary disinfection equipment (such as ultraviolet sterilizers). After this integrated treatment process, the main pollutants in the water body are effectively removed, the water quality is fundamentally restored, and then it is reinjected into the pool body through pipes and inlets.

[0025] Preferably, the planar shape of the pool body 1 is circular, square, or regular octagonal. Limiting the planar shape to one of these three shapes is a preferred option based on a comprehensive consideration of fluid dynamics characteristics, space utilization efficiency, and construction feasibility. Among these shapes, a circular pool body is the ideal choice that best matches the rotating flow field generated by the hydrocyclone. Because the streamlines of the rotating flow field are concentric circles, the circular pool wall provides smooth and continuous boundary guidance for the rotating water flow, allowing the water flow to develop smoothly with almost no impact, reflection, or large vortex dead angles, minimizing energy loss. This achieves the most effective whole-pool water circulation, oxygenation, and waste accumulation towards the center with minimal energy consumption. A square pool body (including rectangular) is a common alternative due to site constraints or traditional construction practices. Although its right-angled areas are prone to vortices and dead water zones, by placing the hydrocyclone at the intersection of the diagonals and optimizing the outlet position, effective circulation can still be formed in most areas. Its advantage lies in its ease of layout and land use. An octagon can be seen as a good compromise between a circle and a square. It is closer to the streamlined shape of a circle than a square, reduces the adverse effects of right angles, has better water flow conditions than a square, and is easier to construct than a circular pool under certain construction conditions. The planar shape selected in this embodiment is a circle.

[0026] Preferably, the hydrocyclone 2 is made of polypropylene. The selection of polypropylene (PP) as the manufacturing material for the hydrocyclone is a key consideration based on its excellent material properties, superior processing characteristics, and the density requirements of the hydrocyclone itself. Polypropylene is a semi-crystalline thermoplastic with irreplaceable advantages in this application. First and foremost, PP has excellent chemical corrosion resistance, capable of withstanding long-term erosion from salt, ammonia nitrogen, hydrogen sulfide, and other organic decomposition products present in aquaculture water. Unlike metal materials, it will not undergo electrochemical corrosion and rust, thus polluting the water. It is also superior to some engineering plastics that may slowly hydrolyze in the aquatic environment, ensuring the long lifespan of the equipment and the cleanliness and safety of the water. Secondly, PP material has good mechanical properties and fatigue resistance. Its sufficient strength and toughness can withstand the continuous impact of water flow and possible minor collisions, ensuring the structural integrity of the hydrocyclone during long-term operation. Thirdly, PP has a lower density than water, a characteristic that means the hydrocyclone can be positioned well at the interface between the water and the outside air. In addition, PP material is inexpensive and is very suitable for manufacturing hydrocyclone components with complex shapes (such as scrapers with curved narrow sides) on a large scale, with high precision and low cost through injection molding, which has significant economic and technological feasibility.

[0027] This utility model has been described through preferred embodiments. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. This utility model is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims of this application are all within the protection scope of this utility model.

Claims

1. A pond structure for aquaculture, characterized in that: Includes a pool body (1), in which a vortexer (2) is provided in the middle. The vortexer (2) rotates at the interface between the water body (3) and the outside air (4). The vortexer (2) is provided with several scrapers (21) for scraping the oil layer on the water surface.

2. The aquaculture pond structure according to claim 1, characterized in that: The number of scrapers (21) is 4 to 8, and they are arranged in a centrally symmetrical manner.

3. The aquaculture pond structure according to claim 2, characterized in that: The number of scrapers (21) is 6.

4. The aquaculture pond structure according to claim 1, characterized in that: The scraper (21) has the following shape: its upper edge (211) and lower edge (212) are parallel to each other, and its side profile is an arc-shaped structure (213) that gradually narrows from top to bottom.

5. The aquaculture pond structure according to claim 1, characterized in that: A vertical fixed pipe (5) is fixedly installed in the middle of the pool body (1), and the vortex generator (2) is rotatably sleeved on the fixed pipe (5).

6. The aquaculture pond structure according to claim 5, characterized in that: The fixed pipe (5) has drainage holes (51) on its upper and lower parts, and the scraper (21) of the vortexer (2) is arranged around the fixed pipe (5).

7. The aquaculture pond structure according to claim 1, characterized in that: The edge of the pool body (1) is provided with a water outlet (6).

8. The aquaculture pond structure according to claim 1, characterized in that: The planar shape of the pool body (1) is circular, square or regular octagonal.

9. The aquaculture pond structure according to claim 1, characterized in that: The hydrocyclone (2) is made of polypropylene.

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