An aeration device for fish farming cages

Abstract

This utility model provides an aeration device for fish farming net cages, including a base, a water pump, an inlet pipe, an outlet pipe, a support rod, and a water tray. The inlet pipe is a flexible hose with both ends connected to the water pump outlet and the base. The outlet pipe consists of multiple rigid pipes installed inside the net cage and around the base, with the lower end of the outlet pipe inside the water and connected to the base, while the upper end is closed and extends upwards out of the water. A spray pipe connected to the outlet pipe and located above the water is installed at the upper end of the outlet pipe. The support rod is vertically fixed to the top of the base, with its upper end extending out of the water. The water tray is coaxially mounted on the support rod and located above the water. Several drainage holes are provided on the side wall of the water tray, connecting to the outside and the containment cavity. All spray pipes face the water tray and can spray water into it. This utility model adopts a three-stage aeration structure for three-dimensional aeration, achieving efficient oxygenation. The open spray pipe and water tray structure eliminates the risk of slit blockage and eliminates the need for frequent shutdowns for cleaning, ensuring continuous aquaculture.

Description

Technical Field

[0001] This utility model belongs to the field of cage fish farming technology, specifically relating to an aeration device for fish farming cages. Background Technology

[0002] Cage aquaculture, as a highly efficient and intensive aquaculture model, has become an important direction for modern fisheries development due to its advantages such as full utilization of water resources and ease of management. However, the high density and vigorous metabolic activity of fish in cages lead to a much higher rate of dissolved oxygen consumption than in natural waters. Especially during high-temperature seasons or under low-pressure weather, this can easily lead to oxygen deficiency, resulting in restricted fish growth or even large-scale mortality. Traditional oxygenation methods mostly rely on aeration devices that directly pump air into the water. These devices mainly consist of an air pump, an air pipe connected to the air pump's outlet, and aeration heads placed in the water and connected to the air pipe. In this type of aeration device, the contact area between the air bubbles generated by the air pump and the liquid is limited, resulting in a low oxygen dissolution rate. At the same time, the aeration heads are prone to clogging, requiring cleaning 1-2 times per month in freshwater environments and weekly in seawater environments. Downtime for maintenance disrupts the continuity of aquaculture. Utility Model Content

[0003] To address the aforementioned problems, the purpose of this invention is to provide an aeration device for fish cages that features a large gas-liquid contact area, a high oxygen dissolution rate, eliminates the need for frequent shutdowns for cleaning, and ensures good continuity of aquaculture.

[0004] The structure of this utility model is achieved through the following technical solution:

[0005] An aeration device for fish farming net cages includes a base, a water pump, an inlet pipe, an outlet pipe, a support rod, and a water tray. The base is a hollow tray placed inside the net cage within the water body. The inlet pipe is a flexible hose with both ends connected to the water pump outlet and the base. The outlet pipe consists of multiple rigid pipes located inside the net cage and around the base, with the lower end inside the water body and connected to the base, while the upper end is closed and extends upwards out of the water body. A spray pipe connected to the outlet pipe and located above the water body is provided at the upper end of the outlet pipe. The support rod is vertically fixed to the top of the base, with its upper end extending out of the water body. The water tray is coaxially mounted on the support rod and located above the water body. The top of the water tray is concave to form a receiving cavity, and several drainage holes communicating with the outside and the receiving cavity are provided on the side wall of the water tray. All spray pipes face the water tray and can spray water into the water tray.

[0006] Furthermore, there are four water outlet pipes, which are evenly arranged around the chassis.

[0007] Furthermore, each outlet pipe is L-shaped, with its horizontal section located at the bottom inside the gabion and its vertical section attached to and tied to the inner wall of the gabion.

[0008] Furthermore, the nozzle is inclined, with its lower end connected to the water outlet pipe and its upper end inclined toward the water tray.

[0009] Furthermore, the nozzle makes an angle of 45° with the horizontal plane.

[0010] Furthermore, the drain holes on the side wall of the water tray are provided in at least two rows from top to bottom.

[0011] Furthermore, the drainage holes in adjacent rows are staggered.

[0012] Furthermore, the aeration device for the fish farming cage also includes a support platform and a sleeve; the support platform is fixed on the part of the support rod located outside the water body; the sleeve is rotatably sleeved on the outside of the support rod, with its lower end in contact with the support platform; the water tray is coaxially fixed on the outer wall of the sleeve and can rotate with the sleeve.

[0013] Furthermore, multiple fan blades are fixed to the outer periphery of the sleeve, and the fan blades are located above the water pan.

[0014] Furthermore, each fan blade has a streamlined structure.

[0015] The beneficial effects of this utility model are as follows:

[0016] This invention employs a three-stage aeration structure for efficient oxygenation. The three stages consist of a jet nozzle, a water tray with broken sections, and a drainage hole with scattered airflow. This structure creates gradient aeration, significantly increasing the dissolved oxygen level compared to traditional devices through three-stage contact between water and air. Furthermore, the traditional aeration head is eliminated, and an open nozzle and water tray structure is used, eliminating the risk of clogging in narrow gaps and reducing the need for frequent shutdowns for cleaning, thus ensuring continuous aquaculture operations. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the aeration device for fish farming cages described in this utility model.

[0019] The following components are shown in the diagram: 1-chassis, 2-inlet pipe, 3-outlet pipe, 4-spray pipe, 5-support rod, 6-support platform, 7-sleeve, 8-water pan, 9-drain hole, 10-fan blade. Detailed Implementation

[0020] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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 based on the specific circumstances. Example 1

[0023] like Figure 1 As shown in the figure, this embodiment provides an aeration device for fish farming cages, including a chassis 1, a water pump, an inlet pipe 2, an outlet pipe 3, a support rod 5, and a water tray 8.

[0024] The chassis 1 is a hollow, cylindrical disc placed within the water body and cage. As a central water distribution hub, the chassis 1 receives water from the pump and distributes it evenly to the four outlet pipes 3 through its internal cavity. It also serves as a stable foundation, providing a fixed base for the support rods and ensuring the overall stability of the device. Furthermore, the cylindrical structure reduces water flow resistance, preventing displacement of the device due to fish activity within the cage.

[0025] The water pump is located outside the net cage and pumps water into the chassis 1 through the inlet pipe 2 to provide a high-pressure water flow to drive the entire aeration system. By extracting oxygen-rich water (or purified circulating water) from outside the net cage, localized oxygen deficiency in the internal water body is avoided.

[0026] The water inlet pipe 2 is a flexible hose with both ends connected to the water pump outlet and the chassis 1 respectively. The hose can adapt to the positional deviation between the net cage and the water pump, making it easy to install and maintain.

[0027] The water outlet pipes 3 consist of four rigid pipes evenly arranged inside the net cage and around the base 1. The lower end of each water outlet pipe 3 is inside the water and connected to the base 1. The upper end of each water outlet pipe 3 is closed and extends upwards out of the water. Each water outlet pipe 3 is L-shaped, with its horizontal section located at the bottom inside the net cage and its vertical section set against and tied to the inner wall of the net cage. The water outlet pipes 3 can transport the water flow distributed by the base 1 upwards to the spray pipes 4. The L-shaped design of the water outlet pipes 3 enhances the resistance to water flow impact, and the binding and fixing prevents the pipes from shifting due to the reaction force of the spray. The horizontal section of the water outlet pipe 3 is close to the bottom of the net cage, reducing the occupation of the breeding space, and the vertical section is laid along the inner wall for easy maintenance.

[0028] A nozzle 4 is installed at the upper end of the water outlet pipe 3, connected to the water outlet pipe 3 and located above the water body. The nozzle 4 is inclined, with its lower end connected to the water outlet pipe 3 and its upper end inclined towards the water basin 8. The angle between the nozzle 4 and the horizontal plane is 45°. At this angle, the water sprayed from the nozzle 4 falls in a parabolic trajectory, forming a parabolic jet. The 45° angle achieves the maximum projection distance and the farthest landing distance, initially expanding the gas-liquid contact area. The parabolic trajectory reduces the direct fall of water droplets back into the water body and prolongs the air contact time. All nozzles 4 are directed towards the water basin 8 and can spray water into the water basin 8.

[0029] The support rod 2 is vertically fixed to the top of the chassis 1, with its upper end extending out of the water body, and is made of stainless steel. The support rod 2 can be configured as a telescopic structure to adapt to different water depths and meet the needs of tidal or cage lifting.

[0030] The water tray 8 is coaxially mounted on the support rod 2 and positioned above the water body. The top of the water tray 8 is recessed to form a receiving cavity. Several drainage holes 9 are provided on the side wall of the water tray 8, connecting the outside to the receiving cavity. There are at least two rows of drainage holes 9 on the side wall of the water tray 8 from top to bottom. Adjacent rows of drainage holes 9 are staggered. The water tray 8 is used to receive the jet from the nozzle 4, breaking the water flow into small droplets. The staggered drainage hole design allows the water droplets to fall dispersedly, avoiding local water accumulation and maximizing the gas-liquid contact area. When the water droplets fall through the drainage holes 9, the 2-3 second residence time in the air significantly improves the oxygen dissolution efficiency.

[0031] Working principle:

[0032] When in use, place all parts of the aeration device for the fish farming net cage except for the water pump inside the net cage, so that the base plate 1 is in contact with the bottom of the net cage, and the horizontal section of the water outlet pipe 3 is also placed inside the bottom of the net cage. The vertical section of the water outlet pipe 3 is then attached to the inner wall of the net cage and tied to the inner wall of the net cage.

[0033] Then, the water pump is started, and the water pump draws water into the chassis 1 through the inlet pipe 2. The water is then distributed through the chassis 1 to four outlet pipes 3, and finally sprayed out at high speed from the nozzles 4 on each outlet pipe 3. The high-pressure water jet forms an atomized jet after being sprayed out of the nozzles 4, which expands the gas-liquid contact area. Then, the sprayed water falls into the water pan 8 in a parabolic trajectory. The water jet impacts the water pan 8 and is broken into small water droplets. Some of the small water droplets splash outside the water pan 8 and fall onto the water surface of the net cage. During the splashing and falling process, they come into further contact with the air, increasing dissolved oxygen. The remaining small water droplets fall into the water pan 8 and gather. Finally, they are evenly scattered from the drain holes 9 on the side wall of the water pan 8. The falling process further increases the gas-liquid contact area and increases the dissolved oxygen content. Example 2

[0034] The difference between this embodiment and Embodiment 1 is that:

[0035] The aeration device for fish farming cages also includes a support platform 6 and a sleeve 7.

[0036] The support platform 6 is fixed on the part of the support rod 5 located outside the water body, serving as a support platform for the rotation of the sleeve 7. It contacts the lower end of the sleeve 7 through a self-lubricating bearing (such as PTFE material) to reduce the coefficient of friction and ensure smooth rotation. It is used to bear the vertical gravity of the water pan 8, the sleeve 7 and the wind 10, and is made of stainless steel.

[0037] The sleeve 7 is rotatably fitted over the support rod 5, with its lower end in contact with the support platform 6; the water tray 8 is coaxially fixed to the outer wall of the sleeve 7 and can rotate with the sleeve 7. 3-6 fan blades 10 are fixed to the outer periphery of the sleeve 7, and the fan blades 10 are located above the water tray 8. Each fan blade 10 has a streamlined structure and its surface is treated with an anti-fouling coating.

[0038] When the outside wind is strong enough, it can drive the fan blade 10 to rotate, which in turn drives the sleeve 7 and the water plate 8 on it to rotate. When the water sprayed from the nozzle 6 falls onto the rotating water plate 8, the water plate 8 breaks the water flow into micron-sized water droplets through the centrifugal force of rotation, thereby allowing the water droplets to fully contact the air and increase the oxygen content.

[0039] Other aspects of this utility model that are not detailed herein are all conventional techniques known to those skilled in the art.

[0040] It should be noted that the terms “comprising,” “including,” or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] The scope of protection of this utility model is not limited to the technical solutions disclosed in the specific embodiments. Any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical essence of this utility model shall fall within the scope of protection of this utility model.

Claims

1. An aeration device for fish farming cages, characterized in that... The system includes a chassis, a water pump, an inlet pipe, an outlet pipe, a support rod, and a water pan. The chassis is a hollow disc placed inside the water body and within the net cage. The inlet pipe is a flexible hose with both ends connected to the water pump outlet and the chassis. The outlet pipe consists of multiple rigid pipes located inside the net cage and around the chassis, with the lower end inside the water body and connected to the chassis, while the upper end is closed and extends upwards out of the water body. A spray pipe connected to the outlet pipe and located above the water body is installed at the upper end of the outlet pipe. The support rod is vertically fixed to the top of the chassis, with its upper end extending out of the water body. The water pan is coaxially mounted on the support rod and located above the water body. The top of the water pan is concave to form a receiving cavity, and several drainage holes communicating with the outside and the receiving cavity are provided on the side wall of the water pan. All spray pipes face the water pan and can spray water into the water pan.

2. The aeration device for fish farming cages according to claim 1, characterized in that... The water outlet pipes consist of four pipes, which are evenly arranged around the base.

3. The aeration device for fish farming cages according to claim 1, characterized in that... Each outlet pipe is L-shaped, with its horizontal section located at the bottom inside the gabion and its vertical section attached to and tied to the inner wall of the gabion.

4. The aeration device for fish farming cages according to claim 1, characterized in that... The nozzle is inclined, with its lower end connected to the water outlet pipe and its upper end inclined toward the water tray.

5. The aeration device for fish farming cages according to claim 1, characterized in that... The nozzle makes an angle of 45° with the horizontal plane.

6. The aeration device for fish farming cages according to claim 1, characterized in that... The water tray sidewall has at least two rows of drainage holes from top to bottom.

7. The aeration device for fish farming cages according to claim 6, characterized in that... The drainage holes in adjacent rows are staggered.

8. The aeration device for fish farming cages according to claim 1, characterized in that... It also includes a support platform and a sleeve; the support platform is fixed on the part of the support rod located outside the water body; the sleeve is rotatably sleeved on the outside of the support rod, and its lower end contacts the support platform; the water pan is coaxially fixed on the outer wall of the sleeve and can rotate with the sleeve.

9. The aeration device for fish farming cages according to claim 8, characterized in that... Multiple fan blades are fixed to the outer periphery of the sleeve, and the fan blades are located above the water pan.

10. The aeration device for fish farming cages according to claim 9, characterized in that... Each fan blade has a streamlined structure.

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