Pressure-bearing type oxygenation filter vat for aquatic recirculating aquaculture

Abstract

The invention belongs to the technical field of aquaculture equipment, and relates to a pressure-bearing oxygenation filter vat for aquatic recirculating aquaculture, which comprises a pressure-bearing sealing vat body, a Venturi jet device, a bag filter, a pressure cylinder and a water return pipeline system. The functions of oxygenation, filtration and biological purification are achieved through integrated design, and the problems that a traditional RAS system is low in integration level, prone to blockage, high in energy consumption and poor in adaptability are solved by means of negative pressure oxygenation of a Venturi jet device, gradient pore self-cleaning of a filter bag body and secondary mixing of gathered air of a pressure cylinder. The system is suitable for high-density recirculating aquaculture and has the advantages of energy conservation, simplicity and convenience in maintenance and stability in operation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of aquaculture equipment, and particularly relates to a pressure-bearing oxygenation filter barrel for a factory-scale recirculating aquaculture system (RAS). BACKGROUND

[0002] A factory-scale recirculating aquaculture system (RAS) is a key equipment for the development of intensive aquaculture. However, the existing technology has the following defects in the filtration and oxygenation process: 1. Low system integration: Physical filtration, biological purification, and oxygenation functions are mostly combined with dispersed equipment, resulting in complex pipelines, large floor area, and serious energy loss.

[0003] 2. Filter material is prone to clogging: Traditional filter screens or filter bags are easily clogged by suspended solids (such as feces and leftover feed), requiring frequent cleaning or replacement, which is costly to maintain.

[0004] 3. High energy consumption: The power efficiency of air pumps or blowers for oxygenation is low, and the electricity consumption accounts for more than 30% of the operating cost.

[0005] 4. Poor pressure adaptability: Non-pressure-bearing equipment cannot adapt to system pressure fluctuations, limiting installation locations and lacking stability.

[0006] Although some technologies have attempted to improve through integrated design or self-cleaning function, they have not fundamentally solved the above problems. Therefore, there is an urgent need for a highly integrated, self-cleaning, energy-efficient, and pressure-bearing integrated filtration and oxygenation device. SUMMARY

[0007] To solve the above problems existing in the prior art, the present application provides a pressure-bearing oxygenation filter barrel for aquaculture recirculating water.

[0008] The technical solution adopted by the present application is as follows: A pressure-bearing oxygenation filter barrel for aquaculture recirculating water, comprising: A pressure-sealed barrel body having a partition plate inside, which divides the barrel cavity of the pressure-sealed barrel body into a water guide groove and a filter chamber; A Venturi jet device is arranged in the water guide groove; the water inlet end is connected to the water inlet on the barrel wall of the pressure-sealed barrel body, the air inlet end extends out of the pressure-sealed barrel body, and the water outlet end sprays a gas-water mixture into the water guide groove; A plurality of bag filters are arranged in the pressure-sealed barrel body; the upper end of the bag filter is connected to the water guide groove through a filter sealing joint on the partition plate; the filter bag body of the bag filter has a pore gradient that is large at the top and small at the bottom; and a coarse filter main body is arranged in the middle of the filter bag body; A pressure cylinder is arranged at the center hole of the partition plate and is in communication with the filter chamber; The return water pipe is arranged in the filter chamber, the upper end of the return water pipe extends into the pressure cylinder and is connected with the return water pipe head, and the lower end of the return water pipe is connected with the return water outlet on the wall of the pressure sealed barrel through the mixer.

[0009] As an alternative or supplement to the above structure: the upper end of the pressure cylinder extends from the top of the pressure sealed barrel and is sealed by a detachable cylinder cover, facilitating installation and maintenance.

[0010] As an alternative or supplement to the above structure: the mixer comprises a mixing pipe and a spiral turbulence sheet fixed in the mixing pipe, which is used to enhance the gas-water mixing.

[0011] As an alternative or supplement to the above structure: the mixer has two, and is arranged in series and parallel, the lower ends of the two are connected through an elbow, and the pipeline between the elbows is fixed to the bottom of the pressure sealed barrel through a support plate.

[0012] As an alternative or supplement to the above structure: the coarse filter body is arranged in the middle of the filter bag body and divides the filter bag body into two filter bag cavities.

[0013] As an alternative or supplement to the above structure: the lower end of the filter bag body is gathered and provided with a fine filter body.

[0014] As an alternative or supplement to the above structure: the water guide groove is circular, and the two Venturi jet devices are distributed in an eight-character shape, and the water outlet directions are opposite and inclined, so that the water flow is collided to strengthen oxygenation.

[0015] As an alternative or supplement to the above structure: the lower part of the pressure cylinder is provided with a return water pipe frame, the return water pipe frame is cross-shaped / Y-shaped, and the return water pipe is fixed to the center thereof.

[0016] The beneficial effects of the present application are: 1. Integration: through the synergistic design of the Venturi jet oxygenation, the bag filter and the pressure cylinder secondary oxygenation, the physical filtration, the biological purification and the oxygenation function are highly integrated, and the system volume and the energy consumption are reduced; 2. Self-cleaning and anti-blocking: the gradient porosity of the filter bag body and the coarse filter body form a microbial carrier to degrade organic matter and effectively prevent blocking; when the internal pressure is greater than or equal to 0.2 MPa, the coarse filter body elastically deforms to release pressure, thereby prolonging the service life of the filter bag; 3. Energy saving and high efficiency: the Venturi jet device uses the kinetic energy of water flow to suck air under negative pressure, without the need for an additional air pump; the mixer secondary oxygenation improves the dissolved oxygen to 20-40 L / min, and the power efficiency is increased by more than 30% compared with traditional equipment; 4. Strong pressure bearing adaptability: the pressure sealed barrel has a pressure bearing capacity of 0.5 MPa, and can be installed at any position of the pipeline, and is suitable for water pressure fluctuation of high-density aquaculture; 5. Low maintenance cost: The bag filters are designed in parallel, so a single failure will not affect the overall operation. They are cleaning-free and have a service life of more than 10 years. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this scheme or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0018] Figure 1 This is a cross-sectional structural diagram of the pressure-bearing oxygen-enriching filter barrel in this scheme; Figure 2 This is a partial structural diagram of the pressure cylinder; Figure 3 This is a schematic diagram of the mixer (used to show the spiral baffle). Figure 4 This is a structural diagram of a bag filter (used to show the gradient pores and the coarse filter body). Figure 5 yes Figure 1 Structural diagram of section AA (used to show the layout of the water guide channel and Venturi jet); Figure 6 This is a diagram showing the operational status of a Venturi jet injector.

[0019] In the diagram: 1-Pressure-bearing sealed tank; 2-Drain valve; 3-Mixer; 31-Spiral baffle; 4-Support plate; 5-Bag filter; 51-Filter bag body; 52-Filter sealing joint; 53-Filter bag cavity; 54-Coarse filter body; 55-Fine filter body; 7-Return water pipe head; 8-Pressure cylinder; 9-Baffle plate; 10-Return water pipe rack; 11-Return water pipe; 12-Venturi jet; 121-Air inlet joint; 122-Welding part; 13-Elbow; 14-Return water outlet; 15-Water inlet. Detailed Implementation

[0020] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only a part of the embodiments, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments in this solution without creative effort are within the protection scope of this solution.

[0021] Example like Figures 1 to 6 As shown in the figure, this embodiment designs a pressure-bearing oxygenation filter barrel for aquaculture recirculating aquaculture, including a pressure-bearing sealed barrel body 1, a drain valve 2, a mixer 3, a support plate 4, a bag filter 5, a return water pipe head 7, a pressure cylinder 8, a partition 9, a return water pipe rack 10, a return water pipe 11, a Venturi jet 12, an elbow 13, a return water outlet 14, and a water inlet 15, etc.

[0022] The pressure-bearing sealed tank 1 is made of PP material and has a cylindrical structure. It has a water inlet 15 and a return outlet 14 at the top, and a drain valve 2 at the bottom. A partition 9 is installed at the top inner part of the pressure-bearing sealed tank 1, dividing the tank cavity into a water guide channel and a filter chamber. The water guide channel is used for water flow mixing and guidance. The filter chamber is used to install a bag filter 5 for filtration. Through the distribution of the water guide channel, the oxygenated water can be evenly guided into the bag filter 5.

[0023] Two DN50 Venturi jets 12 are symmetrically arranged inside the water guide channel, with their outlet directions opposite each other, allowing the water to collide and mix before uniformly entering the bag filter 5. The water inlet of the Venturi jet 12 is connected to the water inlet 15 on the wall of the pressure-bearing sealed tank 1, the air inlet extends outside the pressure-bearing sealed tank 1, and the water outlet sprays a mixed air-water flow into the water guide channel. The water guide channel is annular, and the two Venturi jets 12 are distributed in a figure-eight shape within the channel, with their outlets facing different directions. The water jets from the two Venturi jets 12 collide after being guided by the channel wall. The Venturi jets 12 can be existing DN50 models. The Venturi jets 12 can generate negative pressure, automatically drawing in air and mixing it thoroughly with the water flow to form millimeter-level microbubbles, providing sufficient dissolved oxygen for the cultured organisms and effectively solving the problem that traditional air aeration technology cannot meet the needs of high-density aquaculture. Meanwhile, the figure-eight distribution pattern enables symmetrical distribution and efficient mixing of water flow, significantly improving air-water mixing efficiency and ensuring the system's oxygenation effect.

[0024] The filter bag 5 has a filter bag body 51 with an upper pore size of 100μm and a lower pore size of 50μm. The middle coarse filter body 54 is made of cotton material, used to cultivate nitrifying bacteria to degrade ammonia nitrogen and nitrite. Multiple bag filters 5 are present, each housed within a pressure-bearing sealed tank 1 and used for filtering circulating water. The upper end of each bag filter 5 is connected to a water guide channel via a filter sealing joint on a partition 9. Water from the water guide channel can enter each bag filter 5 through the filter sealing joint. The bag filters 5 are connected in parallel, so a malfunction in one bag filter 5 will not affect the normal operation of the others. The filter bag body 51 of the bag filter 5 can filter water; the pore size at the upper part of the filter bag body 51 is larger than that at the lower part, and a coarse filter body 54 is provided between the upper and lower parts to facilitate the degradation of organic matter in the water by microorganisms within the coarse filter body 54.

[0025] The coarse filter body 54 is located in the middle of the filter bag body 51, dividing the filter bag body 51 into two filter bag chambers 53, one upper and one lower. The upper filter bag chamber 53 forms a pre-filter zone, used for coarse filtration of particulate matter in the circulating water and forming a biofilm carrier. The lower end of the filter bag body 51 is gathered together and a fine filter body 55 is provided. The lower filter bag chamber 53 is located between the fine filter body 55 and the coarse filter body 54 and forms a post-filter zone, used for fine filtration of particulate matter in the circulating water and for automatic pressure relief. Through the design of the pre-filter and post-filter zones, not only is the dual filtration effect of physical interception and biodegradation achieved, but the automatic pressure relief function of the post-filter zone also effectively prevents filter bag clogging, extends the service life of the filter bag, and greatly reduces cleaning and maintenance costs.

[0026] The pressure cylinder 8 is connected to the filter chamber through the central hole of the partition 9, and the upper end of the pressure cylinder extends out of the pressure-bearing sealed barrel body. The water-insoluble air in the filter chamber rises under the action of buoyancy and then continuously accumulates in the pressure cylinder 8, which increases the air pressure in the pressure cylinder 8, so that the air and water can mix and flow out from the return water pipe head 7, and at the same time realize the secondary oxygenation of the water. The upper end of the pressure cylinder 8 extends from the center of the upper end face of the pressure-bearing sealed barrel body 1 and is detachably connected to the cylinder cover. The edge of the cylinder cover can be fastened with 28 M8×35 stainless steel bolts and a nitrile rubber sealing gasket is set, which effectively solves the problem of easy leakage in traditional systems and improves the safety and reliability of the equipment.

[0027] The collected air and filtered water enter the return water pipe 11 from the return water pipe head 7, and are discharged after secondary oxygenation by two series parallel mixers 3 (with built-in spiral baffles 31). The mixers 3 are fixed by elbows 13 and support plates 4. The return water pipe 11 is set in the filter chamber, with its upper end extending into the pressure cylinder 8 and connected to the return water pipe head 7. The lower part of the pressure cylinder 8 is provided with a cross-shaped, straight, or Y-shaped return water pipe rack 10, and the return water pipe 11 is connected to the center of the return water pipe rack 10. The lower end of the return water pipe 11 is connected to the return water outlet 14 on the wall of the pressure-bearing sealed tank 1 through one or more mixers 3. The mixers 3 include two parallel mixers, and the lower ends of the two mixers 3 are connected by two elbows 13; the pipe between the two elbows 13 is connected to the bottom wall of the pressure-bearing sealed tank 1 through the support plate 4. The mixer 3 includes a mixing pipe and a spiral baffle 31, with the spiral baffle 31 set inside the mixing pipe.

[0028] Workflow: Circulating water enters the Venturi jet injector 12 through inlet 15, draws in air, and is sprayed into the guide channel. After initial oxygenation, it enters the bag filter 5 for filtration. The filtered water mixes with air in the pressure cylinder 8, and after secondary mixing and oxygenation through the return pipe 11 and mixer 3, it flows back to the aquaculture tank from the return outlet 14. Impurities settled at the bottom of the tank are periodically discharged through the drain valve 2.

[0029] This equipment can process flow rates of 25-35T / h and is suitable for high-density aquaculture of freshwater and brackish water fish, shrimp, and other species.

[0030] The above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation; it is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom remain within the scope of this technology.

Claims

1. A pressurized aeration filter barrel for recirculating aquaculture systems, characterized in that: include: The pressure-bearing sealed barrel (1) has a partition (9) inside, which divides the barrel cavity of the pressure-bearing sealed barrel (1) into a water guide channel and a filter chamber; Venturi jet (12) is installed in the water guide channel; its water inlet end is connected to the water inlet (15) on the wall of the pressure-bearing sealed barrel (1), its air inlet end extends out of the pressure-bearing sealed barrel (1), and its water outlet end sprays air-water mixture into the water guide channel; Multiple bag filters (5) are installed inside a pressure-bearing sealed barrel (1); the upper end of the bag filter (5) is connected to the water guide groove through a filter sealing joint on the partition (9); the filter bag body (51) of the bag filter (5) has a pore gradient with larger pores at the top and smaller pores at the bottom; a coarse filter body (54) is provided in the middle of the filter bag body (51). The pressure cylinder (8) is located at the center hole of the partition (9) and is connected to the filter chamber; The return water pipe (11) is installed in the filter chamber. Its upper end extends into the pressure cylinder (8) and is connected to the return water pipe head (7). Its lower end is connected to the return water outlet (14) on the wall of the pressure-bearing sealed barrel (1) through the mixer (3).

2. The pressurized aeration filter tank for recirculating aquaculture as described in claim 1, characterized in that: The upper end of the pressure cylinder (8) extends from the top of the pressure-bearing sealing cylinder body (1) and is sealed by a removable cylinder cover.

3. The pressurized aeration filter tank for recirculating aquaculture as described in claim 1, characterized in that: The mixer (3) includes a mixing tube and a spiral baffle (31) fixed therein.

4. The pressurized aeration filter tank for recirculating aquaculture as described in claim 3, characterized in that: The mixer (3) has two units, which are connected in series and arranged in parallel. The lower ends of the two units are connected by elbows (13), and the pipe between the elbows (13) is fixed to the bottom of the pressure-bearing sealed barrel (1) by a support plate (4).

5. The pressurized aeration filter barrel for recirculating aquaculture as described in claim 1, characterized in that: The coarse filter body (54) is located in the middle of the filter bag body (51) and divides the filter bag body (51) into two filter bag cavities (53), one above the other.

6. The pressurized aeration filter barrel for recirculating aquaculture as described in claim 5, characterized in that: The lower end of the filter bag (51) is gathered together and equipped with a fine filter body (55).

7. The pressurized aeration filter tank for recirculating aquaculture as described in claim 1, characterized in that: The water guide channel is circular, and the two Venturi jets (12) are symmetrically distributed in a figure-eight shape with their water outlet directions obliquely opposite each other.

8. The pressurized aeration filter tank for recirculating aquaculture as described in claim 1, characterized in that: The pressure cylinder (8) is provided with a return water pipe bracket (10) at the lower part, and the return water pipe (11) is fixed at its center.

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