Fishpond dirt collecting structure suitable for factory recirculating aquaculture
By using an inner and outer layer filter screen structure, the problem of adaptability to flow requirements during the growth stages of fish in existing technologies has been solved, thus improving the versatility and sewage discharge efficiency of fish pond sludge collection devices.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUBEI DACHANG TECH CO LTD
- Filing Date
- 2025-05-13
- Publication Date
- 2026-05-05
AI Technical Summary
Existing recirculating aquaculture pond waste collection devices, while ensuring fish safety, are unable to meet the flow requirements of fish of different sizes, resulting in reduced versatility in aquaculture.
It adopts an inner and outer layer filter screen structure, with the inner layer having a larger mesh size than the outer layer. The outer layer is fitted over the inner layer. The top of the inner layer has a bracket that inserts into the circulation outlet. The bracket's connection strength can be adjusted, and it is equipped with a top plate and counterweight to enhance stability and filtration effect.
It enables switching of filtration modes according to the growth stage of fish, which can prevent small fish from being sucked away while ensuring water flow, thus improving the versatility and sewage discharge efficiency of fish ponds.
Smart Images
Figure CN224192736U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of aquaculture technology, and specifically relates to a fishpond sludge collection structure suitable for factory-scale recirculating aquaculture. Background Technology
[0002] Currently, commonly used waste collection devices for recirculating aquaculture systems (RAS) primarily employ a pipe system welded to the aquaculture system's circulation pipe inlet. Several notches of varying sizes are cut into the pipes to allow waste from the fishpond to enter the recirculating water system. To prevent fish from entering the system through these notches, the notches must be smaller than the size of the fish being raised. The most direct problem arising from this is that if the fish are very small, the notches must be even smaller, resulting in a relatively small cross-sectional area within the limited pipe diameter. This makes it difficult to guarantee the overall flow rate of the recirculating water system. Alternatively, to ensure sufficient flow, the notches may be relatively large, imposing minimum size requirements on the fish, limiting the aquaculture pond to fish of a specific size and reducing the versatility of RAS systems. Utility Model Content
[0003] In view of this, the purpose of this utility model is to address the shortcomings of the existing technology by providing a fishpond sludge collection structure suitable for factory-scale recirculating aquaculture, which can switch modes according to the growth stages of the fish.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] A fishpond sludge collection structure suitable for factory-scale recirculating aquaculture includes an inner filter screen and an outer filter screen. The mesh size of the inner filter screen is larger than that of the outer filter screen. The outer filter screen is fitted over the inner filter screen. The top of the inner filter screen has a downward-extending bracket that can be inserted into the circulation outlet of the fishpond.
[0006] To better realize this utility model, the above structure is further optimized by providing a top plate on the top of the inner filter screen.
[0007] To better realize this utility model, the above structure is further optimized by providing a counterweight block at the top of the inner filter screen.
[0008] To better realize this utility model, the above structure is further optimized so that the bracket can be inserted into the circulation outlet of the fish pond and fit with it.
[0009] To better realize this utility model, the above structure is further optimized. The support includes three columns extending downward from the top of the inner filter screen, and the bottoms of the three columns are connected by a crossbar to form a triangular structure.
[0010] To better realize this utility model, the above structure is further optimized, and the inner filter screen is made of stainless steel.
[0011] To better realize this utility model, the above structure is further optimized, and the outer filter screen is made of stainless steel.
[0012] To better realize this utility model, the above structure is further optimized, and both the inner filter screen and the outer filter screen are cylindrical structures with bottom openings.
[0013] Compared with the prior art, this utility model has the following advantages:
[0014] This invention provides a fishpond sludge collection structure suitable for factory-scale recirculating aquaculture. Utilizing a double-layer filter, the system can switch modes according to the fish's growth stage. When the fry are small, the outer filter with smaller mesh sizes prevents them from being sucked away. As the fish grow, the outer filter is removed, and the inner filter with larger mesh sizes prevents the larger fish from being sucked away. Furthermore, because the outer filter is larger than the inner filter, even with smaller mesh sizes, the increased surface area allows for greater water flow. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the internal structure of the fishpond sludge collection structure applicable to factory-scale recirculating aquaculture.
[0017] Figure 2 This is a schematic diagram of the complete structure of the outer filter screen in this utility model;
[0018] Figure 3 This is a schematic diagram of the complete structure of the inner filter screen in this utility model.
[0019] In the picture:
[0020] 1-Inner filter screen, 2-Outer filter screen, 3-Support, 4-Top plate, 5-Counterweight. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0022] In the description of this utility model, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0023] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0024] Please refer to Figures 1-3 This utility model provides a fishpond sludge collection structure suitable for factory-scale recirculating aquaculture, comprising an inner filter screen 1 and an outer filter screen 2, both made of stainless steel. The mesh size of the inner filter screen 1 is larger than that of the outer filter screen 2, meaning the cross-sectional area of the mesh of the inner filter screen 1 is larger than that of the outer filter screen 2. The outer filter screen 2 is fitted over the inner filter screen 1. A downwardly extending bracket 3 is provided at the top of the inner filter screen 1. The bracket 3 can be inserted into the circulation outlet of the fishpond for interference fit, thus fixing the fishpond and preventing displacement due to collisions or water flow impacts.
[0025] Furthermore, to further improve the reliability of the connection, a counterweight 5 is provided on the top of the inner filter screen 1. In this embodiment, the support 3 includes three columns extending downward from the top of the inner filter screen 1. The bottoms of the three columns are connected by a crossbar to form a triangular structure. The stability of the triangle is used to improve the connection strength between the support 3 and the fish pond circulation outlet.
[0026] The inner filter screen 1 is equipped with a top plate 4. Since feces, feed residue, and impurities in the fish pond accumulate at the bottom, they need to be cleaned more carefully. This application sets up a shield at the top, so that the water flow can only approach the circulation outlet from the sides. While blocking the water flow at the top, it can further increase the flow rate of the water flow on the sides and the adsorption range of impurities at the bottom of the pond, and can carry away more feces, feed residue, and impurities, thereby improving the effect of sewage collection.
[0027] Under the action of the water circulation system, a vortex will be generated at the circulation outlet. Both the inner filter screen 1 and the outer filter screen 2 are cylindrical structures with open bottoms. The flow rate of the water in the fish pond can be changed by changing the diameter of the cylinder.
[0028] Because a vortex rotates along a certain angle. In uniform circular motion, although the magnitude of the linear velocity remains constant, its direction is constantly changing. Its relationship with angular velocity is v = ωR. The unit of linear velocity is meters per second.
[0029] v(linear velocity) = ω(angular velocity)r.
[0030] ω (angular velocity) = Δθ / Δt = 2π / T = 2πn (θ represents angle or radians).
[0031] According to the formulas for linear velocity and angular velocity, the relationship between angular velocity and linear velocity is v = ωR. Therefore, Bernoulli's equation can be transformed into:
[0032]
[0033] Furthermore, the deeper the water (h increases), the greater the water pressure; the further away from the center of the vortex (r increases), the greater the water pressure and the lower the flow velocity.
[0034] In factory-scale recirculating aquaculture ponds, the water depth and linear velocity are constant (determined by the outflow velocity of the circulating pump). Therefore, we can reduce the flow velocity by increasing the diameter of the filter screen.
[0035] A fishpond cannot forever only raise one type of fish, as each type of fish has different requirements for water flow. When raising fish that prefer low water flow or smaller fry, we can install a larger diameter or shorter filter screen to reduce the water flow speed in the pond and minimize its impact on the fish. When raising fish that prefer faster water flow or larger fish, we can replace the filter screen with a smaller diameter or a taller one to increase the water flow speed in the pond and accelerate the pond's waste removal capacity.
[0036] The double-layer structure and direct insertion into the circulating water inlet allow for faster, better, and more convenient selection of suitable waste collection devices, accelerating the wastewater discharge capacity of fish ponds, improving the water quality environment of fish ponds, and ensuring that farmed fish have a higher stocking density and better meat quality.
[0037] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.
Claims
1. A fishpond sludge collection structure suitable for factory-scale recirculating aquaculture, characterized in that: It includes an inner filter screen (1) and an outer filter screen (2). The mesh size of the inner filter screen (1) is larger than that of the outer filter screen (2). The outer filter screen (2) is fitted over the inner filter screen (1). The top of the inner filter screen (1) is provided with a downward extending bracket (3). The bracket (3) can be inserted into the circulation outlet of the fish pond.
2. The fishpond sludge collection structure suitable for factory-scale recirculating aquaculture as described in claim 1, characterized in that: The inner filter screen (1) is provided with a top plate (4).
3. The fishpond sludge collection structure suitable for factory-scale recirculating aquaculture as described in claim 1, characterized in that: The inner filter screen (1) is provided with a counterweight (5) at the top.
4. The fishpond sludge collection structure suitable for factory-scale recirculating aquaculture as described in claim 1, characterized in that: The bracket (3) can be inserted into the circulation outlet of the fish pond and fits it with an interference fit.
5. A fishpond sludge collection structure suitable for factory-scale recirculating aquaculture as described in claim 4, characterized in that: The support (3) includes three columns extending downward from the top of the inner filter screen (1), and the bottoms of the three columns are connected by a crossbar to form a triangular structure.
6. The fishpond sludge collection structure suitable for factory-scale recirculating aquaculture as described in claim 1, characterized in that: The inner filter screen (1) is made of stainless steel.
7. A fishpond sludge collection structure suitable for factory-scale recirculating aquaculture as described in claim 6, characterized in that: The outer filter screen (2) is made of stainless steel.
8. A fishpond sludge collection structure suitable for factory-scale recirculating aquaculture as described in claim 7, characterized in that: Both the inner filter screen (1) and the outer filter screen (2) are cylindrical structures with openings at the bottom.