Oxygen-enriched water generating device and oxygen-enriched water distribution system

Abstract

The utility model provides a kind of oxygen-rich water generating device and oxygen-rich water layout system, the oxygen-rich water generating device includes: jar body, with jar body inner chamber;Oxygen inlet pipe is connected with jar body inner chamber, for supplying oxygen to jar body inner chamber;Liquid inlet pipe is connected with jar body inner chamber, for supplying water to jar body inner chamber;Liquid outlet pipe is connected with jar body inner chamber, for discharging oxygen-rich water after dissolving into oxygen;Liquid distribution structure includes at least one spray head, the spray head is located in jar body inner chamber and is communicated with liquid inlet pipe, for the water of liquid inlet pipe supply is scattered mode is sprayed into jar body inner chamber, to increase the contact area of water and oxygen, improve the oxygen concentration in water.Working, the water supplied by liquid inlet pipe is scattered mode after being sprayed by spray head, will form by countless small water droplets and / or water mist constitute, have huge total surface area's "water-gas mixing area", to greatly improve the mass transfer efficiency of water and oxygen, quickly promote the oxygen concentration in water, and prepare high oxygen concentration oxygen-rich water.

Description

Technical Field

[0001] This utility model relates to oxygenation equipment in the field of aquaculture, and more particularly to an oxygen-enriched water generating device and an oxygen-enriched water distribution system. Background Technology

[0002] In aquaculture, dissolved oxygen is a crucial factor for the survival and growth of farmed organisms. Insufficient dissolved oxygen in the water can directly lead to slow growth, decreased disease resistance, and even large-scale mortality due to oxygen deprivation, resulting in significant economic losses.

[0003] Currently, the most commonly used oxygenation methods in the industry mainly include mechanical oxygenation and chemical oxygenation. Mechanical oxygenation is represented by surface aeration equipment such as impellers and paddlewheels, as well as bottom microporous aeration equipment. These methods mainly rely on the natural dissolution of oxygen at normal pressure by agitating the water or releasing air bubbles inside the aquaculture water body.

[0004] However, these existing technologies have inherent limitations, such as low dissolved oxygen efficiency and limited dissolved oxygen concentration. Whether it is surface agitation or bottom aeration, a large amount of undissolved oxygen is directly released into the air, resulting in serious oxygen waste.

[0005] In other words, existing technologies generally suffer from low dissolved oxygen efficiency, high oxygen waste, and an inability to exceed concentration limits. Therefore, there is an urgent need in this field for a new oxygenation technology that can efficiently produce high-concentration oxygen-enriched water without excessive oxygen waste. Utility Model Content

[0006] The purpose of this invention is to provide an oxygen-enriched water generating device and a corresponding oxygen-enriched water distribution system that can efficiently produce high-concentration oxygen-enriched water.

[0007] To achieve the above objectives, in a first aspect, this utility model provides an oxygen-enriched water generating device, comprising:

[0008] The tank body has an internal cavity.

[0009] An oxygen inlet pipe is connected to the inner cavity of the tank and is used to supply oxygen to the inner cavity of the tank.

[0010] An inlet pipe is connected to the inner cavity of the tank and is used to supply water to the inner cavity of the tank;

[0011] The outlet pipe is connected to the inner cavity of the tank and is used to discharge the oxygen-enriched water after oxygen has dissolved in it.

[0012] The liquid distribution structure includes at least one nozzle; the nozzle is located in the inner cavity of the tank and is connected to the liquid inlet pipe, and the nozzle is used to spray the water supplied by the liquid inlet pipe into the inner cavity of the tank in a dispersed form to increase the contact area between water and oxygen and increase the dissolved oxygen concentration in the water.

[0013] Furthermore, the spraying direction of the nozzle is from bottom to top.

[0014] Furthermore, the nozzle sprays water from bottom to top in a cone shape with a gradually increasing radius.

[0015] Furthermore, the nozzle is a vortex nozzle capable of ejecting water in a cone shape with a gradually increasing radius.

[0016] Furthermore, the nozzle is positioned in the center of the inner cavity of the tank and is connected to the liquid inlet pipe via a connecting pipe.

[0017] Furthermore, the liquid distribution structure includes a plurality of nozzles, each nozzle being spaced apart from each other by a predetermined distance and arranged sequentially at intervals along the height direction in the center of the inner cavity of the tank.

[0018] Furthermore, the inlet pipe extends into the inner cavity of the tank and extends vertically close to the wall of the inner cavity; each of the nozzles is connected to a different node position of the inlet pipe through a connecting pipe.

[0019] The beneficial effects of this novel oxygen-enriched water generator are as follows:

[0020] When the oxygen-enriched water generator of this invention is working, the inner cavity of the tank is pre-filled with sufficient oxygen, and oxygen is continuously supplied to the inner cavity of the tank during subsequent operation. The water supplied by the liquid inlet pipe is sprayed out through the nozzle of the liquid distribution structure and sprayed into the inner cavity of the tank in a dispersed form, which will form a "water-air mixing area" with a huge total surface area composed of countless small water droplets and / or water mist. This can greatly improve the mass transfer efficiency of water and oxygen, rapidly increase the dissolved oxygen concentration in the water, and finally produce oxygen-enriched water with a high dissolved oxygen concentration.

[0021] Secondly, this utility model also provides an oxygen-enriched water distribution system, which includes the oxygen-enriched water generating device described above; and also includes a liquid supply pipe and a liquid distribution pipe.

[0022] One end of the liquid supply pipe is connected to the liquid inlet pipe, and the other end is connected to a water source; and a water pump and a one-way valve are installed on the liquid supply pipe, wherein the one-way valve is located between the water pump and the liquid inlet pipe to prevent gas-liquid backflow when the machine is stopped;

[0023] One end of the liquid distribution pipe is connected to the liquid outlet pipe, which is used to transport the oxygen-enriched water discharged from the liquid outlet pipe to the aquaculture pond.

[0024] Furthermore, the oxygen-enriched water deployment system also includes high-pressure nozzles;

[0025] The high-pressure nozzle is connected to the liquid distribution pipe and is used to spray oxygen-enriched water along the bottom of the aquaculture pond into the aquaculture pond.

[0026] Furthermore, the liquid distribution pipe includes a main liquid distribution pipe and multiple branch liquid distribution pipes;

[0027] The liquid distribution main pipe is arranged around the edge of the aquaculture pond;

[0028] Each of the liquid distribution branch pipes is arranged around the edge of the aquaculture pond and connected to the liquid distribution main pipe in sequence, and the end of the liquid distribution branch pipe is submerged in the bottom of the aquaculture pond.

[0029] There are multiple high-pressure nozzles, each connected to the end of the liquid distribution branch pipe. Each high-pressure nozzle is located at the bottom of the aquaculture pond and sprays oxygen-enriched water from the edge of the aquaculture pond toward the center.

[0030] The beneficial effects of this novel oxygen-enriched water deployment system are as follows:

[0031] Using the water in the aquaculture pond as a water source, the oxygen-enriched water with a high dissolved oxygen concentration is produced by the oxygen-enriched water generator of this utility model. Through the reasonable arrangement of high-pressure nozzles, the oxygen-enriched water can be sprayed to the bottom of all areas of the aquaculture pond as much as possible. When the oxygen in the oxygen-enriched water rises, it can replenish oxygen at different water levels throughout the aquaculture pond, ensuring "all-round oxygen supply without dead corners" and creating a good living environment for the farmed organisms. Attached Figure Description

[0032] Figure 1 This is an external structural diagram of the oxygen-enriched water generator provided by this utility model;

[0033] Figure 2 This is a diagram illustrating the internal structure of the tank of the oxygen-enriched water generator provided by this utility model;

[0034] Figure 3 The effect of the nozzles in the oxygen-enriched water generator spraying water in a cone shape from bottom to top was demonstrated.

[0035] Figure 4 yes Figure 3 AA-direction cross-section diagram;

[0036] Figure 5 This is a diagram showing the oxygen-enriched water generator of this utility model after connecting the liquid supply pipe and the liquid distribution pipe.

[0037] Figure 6 This is a top view of the oxygen-enriched water distribution system provided by this utility model installed at an aquaculture pond to supplement the aquaculture pond with oxygen-enriched water.

[0038] Figure 7 This is a diagram showing the placement of oxygen-enriched water generators in aquaculture ponds, including the locations of high-pressure nozzles. Detailed Implementation

[0039] The present invention will be further described in detail below with reference to specific embodiments, but the implementation of the present invention is not limited thereto.

[0040] refer to Figure 1 and Figure 2 This utility model provides an oxygen-enriched water generating device 100, which includes a pipe body 110, an oxygen inlet pipe 120, a liquid inlet pipe 130, a liquid outlet pipe 140, and a liquid distribution structure 150.

[0041] The tank body 110 has an inner cavity 11a.

[0042] The oxygen inlet pipe 120 is connected to the inner cavity 11a of the tank and is used to supply oxygen to the inner cavity 11a of the tank.

[0043] The inlet pipe 130 is connected to the inner cavity 11a of the tank and is used to supply water to the inner cavity 11a of the tank.

[0044] The outlet pipe 140 is connected to the inner cavity 11a of the tank and is used to discharge oxygen-enriched water after oxygen has dissolved in it.

[0045] The liquid distribution structure 150 includes at least one nozzle 151. The nozzle 151 is located in the inner cavity 11a of the tank and is connected to the liquid inlet pipe 130. The nozzle 151 is used to spray the water supplied by the liquid inlet pipe 130 into the inner cavity 11a of the tank in a dispersed form, so as to increase the contact area between water and oxygen and increase the dissolved oxygen concentration in the water.

[0046] It should be noted that the water mentioned above is sprayed into the inner cavity 11a of the tank in a dispersed form. The “dispersed form” here can include the form of water droplets, atomization, cone shape, etc.

[0047] The droplet morphology mentioned above refers to "dispersing" a concentrated stream of water into countless small water droplets of varying sizes, similar to showering with a showerhead or raindrops during a downpour, turning a concentrated stream of water into many dispersed small droplets.

[0048] The atomization pattern described above is a more refined form. When the nozzle is designed very precisely and the water pressure is high enough, it can produce extremely tiny water droplets, forming a mist similar to the white mist sprayed from a humidifier.

[0049] The cone shape described above is the spray shape as seen from a macroscopic perspective. The nozzle sprays water at a specific angle through its internal structure (such as swirling chambers, orifices, etc.), forming a three-dimensional coverage area, similar to a fountain that sprays water upward in a cone shape.

[0050] All of the above-mentioned forms break up a concentrated water flow into a large number of droplets and disperse them in a wide, three-dimensional covering (such as a cone), thereby forming a "water-air mixing region" with a huge total surface area, composed of countless small water droplets and / or water mist. The ultimate goal is to greatly improve the mass transfer efficiency between water and oxygen, thereby rapidly increasing the dissolved oxygen concentration in the water.

[0051] To increase the contact time between water and oxygen, this invention preferably sets the spray direction of the nozzle 151 to spray from bottom to top. Spraying from bottom to top increases the movement path of water within the inner cavity 11a of the tank, prolongs the residence time within the inner cavity 11a, and further improves the mass transfer effect between water and oxygen, thereby increasing the dissolved oxygen concentration in the water.

[0052] In a preferred embodiment, see Figure 2 The liquid distribution structure 150 includes a plurality of nozzles 151, each nozzle 151 being spaced apart from each other by a predetermined distance and arranged sequentially at intervals along the height direction in the center of the inner cavity 11a of the tank, forming a multi-layer water spray structure.

[0053] The inlet pipe 130 extends from the lower region of the tank body 110 into the inner cavity 11a of the tank body, and extends vertically close to the wall of the inner cavity 11a. Several nozzles 151 are each connected to different nodes of the inlet pipe 130 through a connecting pipe 152.

[0054] In a preferred embodiment, the nozzle 151 sprays water upwards in a cone shape with a gradually increasing radius. See also Figure 3 ( Figure 3 To more clearly demonstrate the spraying effect, only one nozzle 151 is retained, and the other nozzles 151 are hidden. The nozzle 151 is a vortex nozzle, which is an existing nozzle and a special nozzle designed based on the vortex principle in fluid mechanics. It can transform liquid into an extremely fine conical film to achieve a very uniform distribution. During installation, the water outlet direction of the vortex nozzle is upward, which can spray water from bottom to top in a conical shape. Figure 4 yes Figure 3 AA-direction cross-section diagram, Figure 4 The cross-section shows that after the water flow is ejected from the vortex nozzle, it will spread outwards and the radius will gradually increase.

[0055] The aforementioned cone-shaped water ensures that water droplets have sufficient space and time to fly and scatter in the air. The upward flight trajectory of the water droplets prolongs their contact time with oxygen. At the same time, the hollow areas at the bottom and in the middle of the cone shape also leave space for the flow and replenishment of oxygen, ensuring that the cone-shaped water sprayed from each nozzle 151 can fully transfer mass with oxygen and guarantee a high dissolved oxygen concentration in the liquid.

[0056] The oxygen inlet pipe 120 can be connected to the top, middle, or bottom region of the tank 110, as long as it can supply oxygen to the inner cavity 11a of the tank. The oxygen inlet pipe 120 is connected to an oxygen source. Typically, the oxygen inlet pipe 120 is equipped with an air inlet valve 12a and a flow meter 12b to control the on / off state and the amount of oxygen supplied.

[0057] Among them, see Figure 1 and Figure 2 The inlet end of the liquid inlet pipe 130 is provided with a flange for connecting to the liquid supply pipe 210 (see...). Figure 5 ).

[0058] Among them, see Figure 1 and Figure 2 The outlet pipe 140 is connected to the bottom of the tank body 110. After bending, the outlet pipe 140 is raised to a certain height (higher than the liquid level in the inner cavity 11a of the tank), and an outlet valve 14a is provided at the tail end to control the flow of liquid. In addition, a flange is also provided at the end of the outlet pipe 140 for connecting to the distribution pipe 300 (see...). Figure 5 ).

[0059] Additionally, see Figure 1 and Figure 2 The top of the tank body 110 is also provided with a pressure relief valve 160, which can release gas and reduce the pressure in the inner cavity 11a of the tank body when the gas pressure in the inner cavity 11a of the tank body exceeds a predetermined threshold.

[0060] Preferred, see Figures 1 to 3 The bottom of the tank 110 is provided with multiple support legs 170 to support the bottom of the tank 110.

[0061] During operation, water enters the inner cavity 11a of the tank through the inlet pipe 130, and then is sprayed out through each nozzle 151. The water sprayed from each nozzle 151 forms a multi-layered cone-shaped water flow, which is sprayed from bottom to top. Through cone-shaped dispersion and multi-layer distribution, the total surface area of ​​the water flow is greatly increased. After fully contacting the oxygen pre-filled in the inner cavity 11a, oxygen-enriched water with a high dissolved oxygen concentration can be obtained. This oxygen-enriched water will eventually collect at the bottom of the inner cavity 11a and then be discharged through the outlet pipe 140 to supply oxygen to the aquaculture ponds to supplement the oxygen of the aquaculture organisms in the ponds.

[0062] During operation, a certain liquid level must be maintained in the inner cavity 11a of the tank (e.g., a liquid level of 500mm). When oxygen is supplied to the inner cavity 11a through the oxygen inlet pipe 120, sufficient oxygen can be supplied to reach a certain pressure value in the inner cavity 11a, ensuring that the liquid collected at the bottom of the inner cavity 11a can be discharged automatically through the outlet pipe 140 under the pressure of this pressure, without the need for additional power drainage. At the same time, since the oxygen in the inner cavity 11a will be continuously dissolved in the water and consumed during operation, oxygen must be continuously replenished to the inner cavity 11a at a predetermined unit flow rate. Furthermore, the liquid inflow rate of the inlet pipe 130 must be balanced with the liquid outflow rate of the outlet pipe 140, that is, the liquid inflow rate and the liquid outflow rate must be basically the same to ensure that the liquid level in the inner cavity 11a remains constant.

[0063] When shutting down, the liquid inlet and outlet must be stopped simultaneously, as well as the oxygen supply, to ensure a constant liquid level and appropriate oxygen level in the inner cavity 11a of the tank. If the outlet valve 14a is an electric valve, there may be a delayed closing time. In this case, the electric valve can be closed in advance, paused briefly, and then the water flow into the inlet pipe 130 and the air inlet valve 12a of the oxygen inlet pipe 120 can be stopped. This ensures that the liquid inlet, outlet, and oxygen supply are interrupted synchronously, thereby ensuring that the liquid level in the inner cavity 11a of the tank remains constant during shutdown.

[0064] Based on the above-mentioned oxygen-enriched water generator 100, this utility model also provides an oxygen-enriched water distribution system, which includes the above-mentioned oxygen-enriched water generator 100; and also includes a liquid supply pipe 210 and a liquid distribution pipe 300.

[0065] See Figure 5 One end of the liquid supply pipe 210 is connected to the liquid inlet pipe 130, and the other end is connected to a water source. Furthermore, the liquid supply pipe 210 is equipped with a water pump 220 and a one-way valve 230. The water pump 220 is located at the liquid inlet end of the liquid supply pipe 210, and the one-way valve 230 is located between the water pump 220 and the liquid inlet pipe 130 to prevent gas-liquid backflow when the machine is stopped.

[0066] One end of the liquid distribution pipe 300 is connected to the liquid outlet pipe 140, and is used to transport the oxygen-enriched water discharged from the liquid outlet pipe 140 to the aquaculture pond 900.

[0067] In a preferred embodiment, see Figure 6 The liquid distribution pipe 300 includes a main liquid distribution pipe 310, multiple branch liquid distribution pipes 320, and multiple high-pressure nozzles 400. See Figure 6 and Figure 7The main liquid distribution pipe 310 is arranged around the edge of the aquaculture pond 900. See... Figure 6 and Figure 7 Each of the liquid distribution branch pipes 320 is arranged around the edge of the aquaculture pond 900 and connected sequentially to the liquid distribution main pipe 310, with the end of each liquid distribution branch pipe 320 submerged at the bottom of the aquaculture pond 900 (see...). Figure 7 ).See Figure 6 and Figure 7 There are multiple high-pressure nozzles 400, which are respectively connected to the end of each of the liquid distribution branch pipes 320. Each high-pressure nozzle 400 is located in the bottom area of ​​the aquaculture pond 900 and sprays oxygen-enriched water from the edge of the aquaculture pond 900 to the center in a horizontal direction.

[0068] in, Figure 6 This is a top view of aquaculture pond 900. The area enclosed by the thick black frame in the figure is aquaculture pond 900. The oxygen-enriched water generator 100 is installed in aquaculture pond 900 and is located in a corner of aquaculture pond 900. The dashed arrow in the figure shows the spray path of the high-pressure nozzle 400 spraying oxygen-enriched water. Figure 7 The layout of the oxygen-enriched water generator 100 is shown in three dimensions. The water level of the aquaculture pond 900 is marked in the figure. The support legs 170 of the tank 110 are fixed on a lifting platform 200, which is fixedly installed in the aquaculture pond 900. The dotted arrows in the figure also indicate the spray path of the high-pressure nozzle 400 spraying oxygen-enriched water.

[0069] Before starting work, adjust the height of the lifting platform 200 to ensure that the liquid level in the inner cavity 11a of the tank is slightly higher than the water level line of the aquaculture pond 900 (e.g., 10cm to 20cm higher). This ensures the stability of the tank 110 and prevents it from sinking too deep into the water, which could affect its stability due to buoyancy. Simultaneously, before starting work, the water pump 220 must be submerged in the aquaculture pond 900 to directly draw water from it as the source for producing oxygen-enriched water.

[0070] In the above structure, each high-pressure nozzle 400 sprays oxygen-enriched water from the perimeter of the aquaculture pond 900 towards the center, increasing the coverage area of ​​the oxygen-enriched water and covering the bottom of the entire aquaculture pond 900 as much as possible. Furthermore, because the high-pressure nozzles 400 are located at the bottom of the aquaculture pond 900 and spray horizontally, the sprayed oxygen-enriched water initially reaches the bottom of the pond. Then, as oxygen levels rise, the oxygen-enriched water effectively replenishes oxygen at different water levels throughout the aquaculture pond 900, ensuring sufficient oxygen supply to the cultured organisms in different areas and at different water levels.

[0071] Therefore, it can be seen that the oxygen-enriched water distribution system of this utility model, with proper layout, only needs to ensure that the spacing between adjacent high-pressure nozzles 400 is appropriate and the spraying distance of the high-pressure nozzles 400 is suitable. This can replenish oxygen to all areas of the aquaculture pond 900 at different water levels as much as possible, creating a good living environment for the farmed organisms. If the width of the aquaculture pond 900 is too wide, and the spraying distance of the high-pressure nozzles 400 on the left and right sides cannot reach the middle of the pond, then additional high-pressure nozzles 400 can be added in the middle area of ​​the aquaculture pond 900 to ensure that the middle area is also covered by oxygen-enriched water, guaranteeing "all-round, no dead angle" oxygen supply.

[0072] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An oxygen-enriched water generator, characterized in that, include: The tank (110) has an inner cavity (11a). An oxygen inlet pipe (120) is connected to the inner cavity (11a) of the tank and is used to supply oxygen to the inner cavity (11a) of the tank. The inlet pipe (130) is connected to the inner cavity (11a) of the tank and is used to supply water to the inner cavity (11a) of the tank; The outlet pipe (140) is connected to the inner cavity (11a) of the tank and is used to discharge oxygen-enriched water after oxygen has been dissolved in it; The liquid distribution structure (150) includes at least one nozzle (151); the nozzle (151) is located in the inner cavity (11a) of the tank and communicates with the liquid inlet pipe (130). The nozzle (151) is used to spray the water supplied by the liquid inlet pipe (130) into the inner cavity (11a) of the tank in a dispersed form, so as to increase the contact area between water and oxygen and increase the dissolved oxygen concentration in the water.

2. The oxygen-enriched water generator according to claim 1, characterized in that, The spraying direction of the nozzle (151) is from bottom to top.

3. The oxygen-enriched water generating device according to claim 2, characterized in that, The nozzle (151) sprays water from bottom to top in a cone shape with a gradually increasing radius.

4. The oxygen-enriched water generating device according to claim 3, characterized in that, The nozzle (151) is a vortex nozzle capable of ejecting water in a cone shape with a gradually expanding radius.

5. The oxygen-enriched water generating device according to any one of claims 1 to 4, characterized in that, The nozzle (151) is located in the center of the inner cavity (11a) of the tank and is connected to the liquid inlet pipe (130) through a connecting pipe (152).

6. The oxygen-enriched water generating device according to claim 5, characterized in that, The liquid distribution structure (150) includes a plurality of nozzles (151), each nozzle (151) being spaced apart from each other by a predetermined distance and arranged sequentially at intervals along the height direction in the center of the inner cavity (11a) of the tank.

7. The oxygen-enriched water generating device according to claim 6, characterized in that, The inlet pipe (130) extends into the inner cavity (11a) of the tank and extends vertically close to the wall of the inner cavity (11a); several nozzles (151) are each connected to different nodes of the inlet pipe (130) through a connecting pipe (152).

8. An oxygen-enriched water deployment system, characterized in that, It includes the oxygen-enriched water generating device (100) according to any one of claims 1 to 7; and also includes a liquid supply pipe (210) and a liquid distribution pipe (300); One end of the supply pipe (210) is connected to the inlet pipe (130), and the other end is connected to a water source; furthermore, the supply pipe (210) is equipped with a water pump (220) and a one-way valve (230), wherein, The one-way valve (230) is disposed between the water pump (220) and the liquid inlet pipe (130) to prevent gas-liquid backflow when the machine is stopped; One end of the liquid distribution pipe (300) is connected to the liquid outlet pipe (140) and is used to transport the oxygen-enriched water discharged from the liquid outlet pipe (140) to the aquaculture pond (900).

9. The oxygen-enriched water deployment system according to claim 8, characterized in that, The oxygen-enriched water deployment system also includes high-pressure nozzles (400). The high-pressure nozzle (400) is connected to the liquid distribution pipe (300) and is used to spray oxygen-enriched water along the bottom of the aquaculture pond (900) into the aquaculture pond (900).

10. The oxygen-enriched water deployment system according to claim 9, characterized in that, The liquid distribution pipe (300) includes a main liquid distribution pipe (310) and multiple branch liquid distribution pipes (320); The liquid distribution main pipe (310) is arranged around the edge of the aquaculture pond (900); Each of the liquid distribution branch pipes (320) is arranged around the edge of the aquaculture pond (900) and connected to the liquid distribution main pipe (310) in sequence, and the end of the liquid distribution branch pipe (320) is submerged in the bottom of the aquaculture pond (900). There are multiple high-pressure nozzles (400), which are respectively connected to the end of each of the liquid distribution branch pipes (320). Each of the high-pressure nozzles (400) is located at the bottom of the aquaculture pond (900) and sprays oxygen-enriched water from the edge of the aquaculture pond (900) to the center.

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