CN217446273U - Pond intensive care system - Google Patents

Abstract

The application discloses a small pond intensive culture system which comprises a water storage area, a culture area and a treatment area; the culture area comprises a plurality of culture ponds which are arranged at equal intervals, and a sewage discharge system is arranged in each culture pond; the water storage area is arranged at the outer side of the culture area and is used for providing clean culture water for each culture pond; the treatment area is arranged on the outer side of the culture area and is used for collecting and treating culture tail water generated in each culture pond. The small pond intensive culture system has the advantages of good water changing capacity, low difficulty in cleaning and discharging sewage, convenience in management and difficulty in environmental pollution.

Description

Pond intensive care system

Technical Field

The application relates to the technical field of aquaculture, in particular to a small pond intensive culture system.

Background

With the continuous decrease of world fishery resources, the improvement of aquaculture technology and the increasing of global population, the aquaculture industry plays an increasingly important role in meeting the increasing demand of aquatic products of consumers. At present, shrimps are an important breeding variety in the aquaculture industry of China, have rich trace elements beneficial to human bodies, have high nutritional value and are popular with consumers.

In the prior art, the culture mode of shrimps (such as prawns) is usually pond culture, and the culture mode has the following disadvantages: 1. because the area of the culture pond is generally large, the water changing capacity is poor, the difficulty of cleaning and discharging sewage is large, the water quality is easy to be polluted, and the management difficulty is large; 2. the culture tail water contains a large amount of N, P and other organic matters, and is directly discharged to easily pollute the environment.

Therefore, how to improve the existing culture mode to overcome the above disadvantages is a problem to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

An object of this application is to provide a pond intensive care system that trades water ability well, and the decontamination, the blowdown degree of difficulty are low, the management of being convenient for, and difficult polluted environment.

In order to achieve the above purposes, the technical scheme adopted by the application is as follows: a small pond intensive culture system comprises a water storage area, a culture area and a treatment area; the culture area comprises a plurality of culture ponds which are arranged at equal intervals, and a sewage discharge system is arranged in each culture pond; the water storage area is arranged on the outer side of the culture area and is used for providing clean culture water for each culture pond; the treatment area is arranged on the outer side of the culture area and is used for collecting and treating culture tail water generated in each culture pond.

Preferably, the treatment zone comprises a physical treatment system comprising a first conduit, a micro-filter and an aeration tank; the culture tail water is discharged into the micro-filter through the first pipeline, so that suspended particles in a water body are filtered by the micro-filter and then discharged into the aeration tank for aeration treatment. The advantages are that: the culture tail water discharged from the culture ponds can be collected through the first pipeline, and then discharged into the micro-filter for back flushing and filtering, suspended particulate matters in the culture tail water are filtered out and then discharged into the aeration pond for aeration, so that the content of N, P and other organic matters in the culture tail water is reduced.

Preferably, the treatment area further comprises a biological treatment system, wherein the biological treatment system comprises a second pipeline and a degradation tank; and tail water in the aeration tank is discharged into the degradation tank through the second pipeline for biodegradation. The advantages are that: the tail water in the aeration tank can be discharged into the degradation tank through the second pipeline for biodegradation, so that the content of organic matters such as N, P in the aquaculture tail water can be further reduced.

Preferably, the processing area further comprises a shellfish offspring seed cultivation processing system, the shellfish offspring seed cultivation processing system comprises a third pipeline and an advection pool, and tail water in the degradation pool is discharged into the advection pool through the third pipeline; the height of the advection pool is 15 cm-25 cm, and soil with the thickness of 4 cm-6 cm and used for cultivating shellfish seedlings is filled at the bottom in the advection pool. The advantages are that: through the third pipeline can be effectively with tail water in the degradation pond is discharged in the advection pond to through the shellfish seed fry of breeding in the earth can disappear again organic matters such as N, P in the breed tail water, thereby make final exhaust tail water reach emission standard and by water storage area recycle's standard. In addition, after the content of organic matters such as N, P in the aquaculture tail water is sufficiently reduced by the aeration tank and the degradation tank, the shellfish offspring seeds can be effectively prevented from being unable to bear due to the fact that the content of organic matters such as N, P in the tail water discharged into the advection is too high; that is to say, the setting mode can effectively improve the yield of the shellfish offspring seeds.

Preferably, the area of the culture pond is 30m ² ～40m ² . The advantages are that: the area of the culture pond is not too large, so that the difficulty of cleaning and discharging sewage is increased and the water changing capacity is weakened. Certainly, the area of the culture pond is not too small, the area utilization rate of the culture area is lowered due to the too small area, and the corresponding construction cost is increased; meanwhile, the breeding density is easily increased sharply due to the over-fast breeding of the prawns. Therefore, after comprehensive comparison, the area of each culture pond is 30m ² ～40m ² It is preferable to use it.

Preferably, the water depth of the culture pond is 1.0-1.5 m. The advantages are that: when the water depth in the culture pond is 1.0-1.5 m, the prawn culture pond is suitable for prawn life.

Preferably, an aerator is arranged in the culture pond, and the ratio of the power of the aerator to the area of the culture pond is 20w/m ² ～40w/m ² . The advantages are that: through the oxygen-increasing machine can fully improve the content of dissolved oxygen in the pond water to maintain the normal survival demand of shrimp. According to the experiment, when the ratio of the power of the aerator to the area of the culture pond is 20w/m ² ～40w/m ² In time, the dissolved oxygen content in the water body in the culture pond can be effectively ensured to be suitable for the survival of the prawns.

Preferably, the water storage area comprises a water storage tank and a disinfection tank, wherein the water storage tank is used for collecting environmental water or the culture tail water treated by the treatment area; the disinfection pond is used for collecting water in the water storage pond, and the water is discharged into the culture ponds after disinfection treatment. The advantages are that: the water storage tank can collect environmental water in advance or recover the culture tail water treated by the treatment area so as to ensure sufficient water source and facilitate supplementing water to the disinfection tank in time; through the disinfection can be effectively to follow obtain after the water of draining in the cistern carries out disinfection treatment breed the water, discharge into again each breed in the pond to the guarantee breed the water source of water is clean.

Preferably, the water storage capacity of the water storage tank and the water storage capacity of the disinfection tank are 1.5-3.0 times of the water changing capacity of all the culture tanks. The advantages are that: the stronger the water storage capacity of the water storage tank and the disinfection tank is, the stronger the capacity of providing the culture water for each culture tank is, and correspondingly, the higher the cost for constructing and maintaining the water storage tank and the disinfection tank is; after comprehensive comparison, the water storage capacity of the water storage tank and the disinfection tank is more suitable when the water change capacity of all the culture tanks is 1.5-3.0 times.

Preferably, the sewage system is a double sewage system. The advantages are that: through two sewage disposal systems can be effectively right breed and carry out the blowdown in the pond, can separate the discharge with shrimp shell and incomplete bait, excrement and urine simultaneously effectively.

Preferably, the sewage discharge system comprises a drain pipe, a sewage discharge pipe and a chassis; a water inlet communicated with the culture pond is formed in the upper end of the drain pipe, and a water outlet is formed in the lower end of the drain pipe in a bending mode; the chassis is of a pot bottom structure with an open upper end, the chassis is sleeved on the periphery of the drain pipe and is positioned between the water inlet and the water outlet, and the upper end of the chassis is flush with the inner bottom surface of the culture pond; one end of the drain pipe is communicated with the water outlet, and the other end of the drain pipe is communicated with the inner side wall of the chassis along the horizontal tangential direction of the chassis. The advantages are that: under the action of gravity, the shrimp shells, residual baits, excrement and the like in the culture pond can sink into the chassis. After the water outlet is opened, under the action of pump suction or pressure difference, sewage at the bottom of the culture pond can be quickly discharged through the water outlet, and according to the principle that the larger the flow speed is, the smaller the pressure is, a siphon effect can be generated at one end of the sewage discharge pipe close to the chassis, so that shrimp shells, residual baits, excrement and the like in the chassis can be sucked away through the water outlet; meanwhile, the sewage discharge pipe is communicated with the inner side wall of the chassis along the horizontal tangential direction, so that a siphon effect is generated, and a vortex effect is generated inside the chassis, so that the shrimp shells, residual baits, excrement and the like in the chassis can be sucked completely.

Compared with the prior art, the beneficial effect of this application lies in: the culture area comprises a plurality of culture ponds which are arranged at equal intervals, so that the culture area with a large area can be divided into a plurality of culture ponds with small areas, and management is facilitated; because each culture pond is internally provided with a sewage discharge system, compared with the traditional large-area sewage disposal operation, the small-area culture pond can be automatically cleaned through the sewage discharge system, and the difficulty of sewage disposal and sewage disposal is lower; the water storage area can provide clean water for the culture in each culture pond, so that the culture tail water in each culture pond can be quickly supplemented after being discharged, and the water changing capacity of each culture pond is improved conveniently; due to the arrangement of the treatment area, the culture tail water discharged from each culture pond can be effectively collected through the treatment area, and can be effectively treated, so that the culture tail water is discharged into a drainage port or the water storage area after reaching the standard.

Drawings

Fig. 1 is a schematic layout view of a small pond intensive culture system provided in the present application.

Fig. 2 is a schematic layout diagram of the processing region in fig. 1 provided in the present application.

Fig. 3 is a perspective view of a drainage system according to the present application.

Fig. 4 is a cross-sectional view of the soil exhaust system of fig. 3 as provided herein.

In the figure: 1. a water storage area; 11. a reservoir; 12. a disinfection tank; 2. a culture area; 21. a culture pond; 22. a blowdown system; 221. a drain pipe; 2211. a water inlet; 2212. a water outlet; 222. a blow-off pipe; 223. a chassis; 3. a treatment zone; 31. a physical processing system; 311. a first conduit; 312. a micro-filter; 313. an aeration tank; 32. a biological treatment system; 321. a second conduit; 322. a degradation tank; 33. a shellfish offspring seed cultivating and processing system; 331. a third pipeline; 332. a advection pool; 333. soil; 4. a port of entry; 5. draining the water port; 6. and a working operation platform.

Detailed Description

The present application is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.

In the description of the present application, it should be noted that, for the terms of orientation, such as "central", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., it indicates that the orientation and positional relationship shown in the drawings are based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be construed as limiting the specific scope of protection of the present application.

It is noted that the terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

The terms "comprises," "comprising," and "having," and any variations thereof, in the description and claims of this application are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Referring to fig. 1-4, one embodiment of the present application provides a small pond intensive care system comprising an impoundment area 1, a culture area 2, and a treatment area 3. Breed district 2 includes a plurality of equal intervals the breed pond 21 that sets up, through breeding the district 2 and setting up a plurality of breed ponds 21, can separate into the less breed pond 21 of a plurality of areas with the breed district 2 of bigger area to facilitate the management. All be equipped with sewage disposal system 22 in every breed pond 21, compare in traditional large tracts of land operation of decontaminating, this kind of sewage disposal system 22 of independent setting can be effectively to the automatic trash cleaning of breed pond 21 of this kind of small size, and the dirt cleaning, the blowdown degree of difficulty are lower. The water storage area 1 is arranged outside the culture area 2, and the water storage area 1 is used for providing clean culture water for each culture pond 21; the clean water for cultivation can be provided for each cultivation pond 21 through the water storage area 1, so that the cultivation tail water in each cultivation pond 21 can be quickly supplemented after being discharged, and the water changing capacity of each cultivation pond 21 is improved conveniently. The treatment area 3 is arranged at the outer side of the culture area 2, and the treatment area 3 is used for collecting and treating culture tail water generated in each culture pond 21; the culture tail water discharged from each culture pond 21 can be effectively collected through the treatment area 3, and can be effectively treated, so that the culture tail water is discharged into the drainage port 5 or the water storage area 1 after reaching the standard.

Referring to fig. 2, in some embodiments of the present application, the treatment zone 3 comprises a physical treatment system 31, the physical treatment system 31 comprising a first conduit 311, a microfilter 312, and an aeration tank 313; the aquaculture tail water is discharged into the micro-filter 312 through the first pipeline 311, so that suspended particles in the water body are filtered by the micro-filter 312 and then discharged into the aeration tank 313 for aeration treatment. The culture tail water discharged from each culture pond 21 can be collected through the first pipeline 311, and then discharged into the micro-filter 312 for back washing and filtering, and then discharged into the aeration tank 313 for aeration after suspended particles in the culture tail water are filtered out, so as to reduce the content of organic matters such as N, P in the culture tail water.

Referring to fig. 2, in some embodiments of the present application, treatment area 3 further comprises a biological treatment system 32, biological treatment system 32 comprising a second conduit 321 and a degradation pond 322; tail water in the aeration tank 313 is discharged into the degradation tank 322 through a second pipeline 321 for biodegradation. The tail water in the aeration tank 313 can be discharged into the degradation tank 322 through the second pipeline 321 for biodegradation, so that the content of organic matters such as N, P in the aquaculture tail water can be further reduced. It should be noted that the degradation pond 322 is a prior art, for example, the cultivation tail water is biodegraded by planting aquatic plants such as the hippocampus by an artificial floating bed and by hanging a brush, and is matched with a greenhouse and a sunshade net with a certain area, so as to be beneficial to heat preservation in winter and prevent the hippocampus from being frostbitten.

In some embodiments of the present application, the processing area 3 further comprises a shellfish offspring seed rearing processing system 33, the shellfish offspring seed rearing processing system 33 comprises a third pipeline 331 and an advection pool 332, and tail water in the degradation pool 322 is discharged into the advection pool 332 through the third pipeline 331. The height of the advection pool 332 is 15 cm-25 cm, and soil 333 which is 4 cm-6 cm thick and is used for cultivating shellfish seedlings is filled at the bottom in the advection pool 332. The tail water in the degradation tank 322 can be effectively discharged into the advection tank 332 through the third pipeline 331, and organic matters such as N, P in the cultivation tail water can be eliminated again through the shellfish seeds cultured in the soil 333, so that the finally discharged tail water reaches the discharge standard and the standard of being recycled by the water storage area 1. In addition, after the content of organic matters such as N, P in the aquaculture tail water is fully reduced by the aeration tank 313 and the degradation tank 322, the shellfish offspring seeds can be effectively prevented from being unable to bear due to the fact that the content of organic matters such as N, P in the tail water discharged into advection is too high; that is to say, the setting mode can effectively improve the yield of the shellfish offspring seeds, and the yield in each square meter area is improved by 15-20 kg according to the experiment. In order to ensure that the growth environment of the shellfish fries is proper, the thickness of the soil 333 filled in the advection pool 332 is not too thin, and the shellfish can lack a growth space when the thickness is lower than 4 cm; certainly, too thick is not suitable, which can cause the harvest difficulty to be increased, and generally not more than 6 cm; according to experiments, the thickness M of the soil 333 is most suitable to be 5 cm. In addition, since the depth of water in the advection pool 332 is too deep or too shallow to be suitable for the growth of shellfish, the height L of the advection pool 332 generally needs to be kept at 15cm to 25cm, preferably 20cm, so that the depth of liquid level in the advection pool 332 is kept at 15 cm.

In some embodiments of the present application, the culture pond 21 has an area of 30m 2-40 m 2. The area of the culture pond 21 is not too large, which causes the difficulty of sewage disposal and pollution discharge to be increased and the water changing capacity to be weakened. Certainly, the area of the culture pond 21 is not too small, which causes the area utilization rate of the culture area 2 to be low and the corresponding construction cost to be increased; meanwhile, the breeding density is easily increased sharply due to the over-fast breeding of the prawns. Therefore, after comprehensive comparison, the area of each culture pond 21 is preferably 30m 2-40 m 2. Preferably, the culture pond 21 is a square with a side length of 6 m.

In some embodiments of the present application, the depth of the culture pond 21 is 1.0m to 1.5 m. When the water depth in the culture pond 21 is 1.0 m-1.5 m, the prawn cultivation device is suitable for prawn life. Preferably, the water depth in the culture pond 21 is preferably 1.1m to 1.2 m.

In some embodiments of the present application, an aerator is disposed in the culture pond 21, and a ratio of power of the aerator to an area of the culture pond 21 is 20w/m 2-40 w/m 2. The content of dissolved oxygen in the water body in the culture pond 21 can be fully improved through the aerator so as to maintain the normal survival demand of the prawns. Experiments prove that when the ratio of the power of the aerator to the area of the culture pond 21 is 20w/m 2-40 w/m2, the content of dissolved oxygen in the water body in the culture pond 21 can be effectively ensured to be suitable for the survival of prawns.

Referring to fig. 1, in some embodiments of the present application, the impoundment area 1 comprises a reservoir 11 and a disinfection tank 12, the reservoir 11 is used for collecting environmental water or aquaculture tail water treated by the treatment area 3; the disinfection tank 12 is used for collecting the water in the reservoir 11, performing disinfection treatment and then discharging the water into each culture tank 21. The reservoir 11 can collect environmental water in advance or recover the culture tail water treated by the treatment area 3 to ensure sufficient water source and facilitate supplementing water to the disinfection tank 12 in time; the water drained from the reservoir 11 can be effectively disinfected through disinfection to obtain the culture water, and then the culture water is drained into each culture pond 21, so that the water source of the culture water is clean.

In some embodiments of the present application, the water storage capacity of the water storage tank 11 and the disinfection tank 12 is 1.5 times to 3.0 times the water change capacity of all the culture tanks 21. The stronger the water storage capacity of the reservoir 11 and the disinfection tank 12, the stronger the capacity of supplying the culture water to each culture tank 21, and accordingly, the higher the cost for constructing and maintaining the reservoir 11 and the disinfection tank 12; after comprehensive comparison, the water storage capacity of the water storage tank 11 and the disinfection tank 12 is more suitable when the water changing capacity of all the culture tanks 21 is 1.5-3.0 times.

It should be noted that the present application is not limited to the specific configuration of the exhaust system 22, and reference is made to only two examples provided below:

the first embodiment is as follows: the exhaust system 22 is a dual exhaust system 22. The double sewage system 22 can effectively discharge sewage in the culture pond 21 and can effectively separate and discharge shrimp shells, residual baits and excrement. It should be noted that the double sewage disposal system 22 is a prior art, and the specific working principle thereof is not described in detail herein; the dual exhaust system 22 is effective to exhaust the shrimp shells on the one hand and the residual bait and feces on the other hand.

Example two: referring to fig. 3 and 4, the soil exhaust system 22 includes a drain pipe 221, a soil exhaust pipe 222, and a bottom plate 223; a water inlet 2211 communicated with the culture pond 21 is formed at the upper end of the water drainage pipe 221, and a water outlet 2212 is formed at the lower end of the water drainage pipe 221 in a bent mode; the bottom plate 223 is a pan bottom structure with an open upper end, the bottom plate 223 is sleeved on the periphery of the water discharge pipe 221, the bottom plate 223 is positioned between the water inlet 2211 and the water outlet 2212, and the upper end of the bottom plate 223 is flush with the inner bottom surface of the culture pond 21; one end of the drainage pipe 222 is connected to the drainage port 2212, and the other end of the drainage pipe 222 is connected to the inner side wall of the base plate 223 along the horizontal tangential direction of the base plate 223. Under the action of gravity, the shrimp shells, residual baits, excrements, and the like in the culture pond 21 sink into the bottom plate 223. After the drainage port 2212 is opened, under the action of pumping action or pressure difference, the sewage at the bottom in the culture pond 21 can be quickly drained through the drainage port 2212, and according to the principle that the greater the flow rate is, the smaller the pressure is, the siphon effect is generated at one end of the drainage pipe 222 close to the chassis 223, so that the shrimp shells, residual baits, excrement and the like in the chassis 223 can be sucked away through the drainage port 2212; meanwhile, as the sewage discharge pipe 222 is communicated with the inner side wall of the chassis 223 along the horizontal tangential direction, the siphon effect is generated, and the vortex effect is generated inside the chassis 223, so that the shrimp shells, the residual baits, the excrement and the like in the chassis 223 can be sucked up more fully.

The working principle is as follows: as shown in fig. 1 and 2, the water in the water inlet port 4 is discharged into the reservoir 11 for standby by a drop height or a pumping mode; when the water in the disinfection tank 12 is consumed, the water in the reservoir 11 is discharged into the disinfection tank 12 through a drop height or a pumping mode, and clean culture water can be obtained after the water is disinfected and then is deposited for about 2 days. The water for cultivation can be supplied into each cultivation pond 21 through a pump and a pipe to replace each cultivation pond 21. The culture tail water discharged from the culture pond 21 is discharged into the micro-filter 312 through the first pipeline 311 for backflushing filtration, then is discharged into the aeration tank 313 for aeration, and then is discharged into the degradation tank 322 through the second pipeline 321 for biodegradation, so that the content of organic matters such as N, P in the culture tail water is reduced, and the concentration of N, P is suitable for the culture and growth of shellfish seeds; and finally, the shellfish seeds are discharged into the advection pool 332 through a third pipeline 331, and the shellfish seeds need to absorb a large amount of N, P during growth, so that the water finally discharged into the drainage port 5 reaches the standard for direct discharge or discharge into the water storage pool 11 for recycling. In addition, the arranged working operation platform 6 is convenient for personnel to manage.

The foregoing has described the general principles, essential features, and advantages of the application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, which are merely illustrative of the principles of the application, but that various changes and modifications may be made without departing from the spirit and scope of the application, and these changes and modifications are intended to be within the scope of the application as claimed. The scope of protection claimed by this application is defined by the following claims and their equivalents.

Claims (10)

1. A small pond intensive culture system is characterized by comprising a water storage area, a culture area and a treatment area; the culture area comprises a plurality of culture ponds which are arranged at equal intervals, and a sewage discharge system is arranged in each culture pond; the water storage area is arranged on the outer side of the culture area and is used for providing clean culture water for each culture pond; the treatment area is arranged on the outer side of the culture area and is used for collecting and treating culture tail water generated in each culture pond.

2. The potty intensive care system of claim 1, wherein the treatment area comprises a physical treatment system comprising a first conduit, a microfiltration machine, and an aeration basin; the culture tail water is discharged into the micro-filter through the first pipeline, so that suspended particles in a water body are filtered by the micro-filter and then discharged into the aeration tank for aeration treatment.

3. The lagoon intensive care system of claim 2, wherein the treatment area further comprises a biological treatment system comprising a second conduit and a degradation pond; and tail water in the aeration tank is discharged into the degradation tank through the second pipeline for biodegradation.

4. The minipond intensive care system of claim 3, wherein the processing zone further comprises a shellfish seed rearing processing system comprising a third conduit through which the tail water in the degradation pond drains into the advection pond, and an advection pond; the height of the advection pool is 15 cm-25 cm, and soil with the thickness of 4 cm-6 cm and used for cultivating shellfish seedlings is filled at the bottom in the advection pool.

5. The potty intensive care system of claim 1, wherein the culture pond has an area of 30m ² ～40m ² (ii) a The water depth of the culture pond is 1.0-1.5 m.

6. The small pond intensive culture system according to claim 1, wherein an aerator is arranged in the culture pond, and the ratio of the power of the aerator to the area of the culture pond is 20w/m ² ～40w/m ² 。

7. The small pond intensive care system according to claim 1, wherein the water storage area comprises a water reservoir for collecting environmental water or the culture tail water after being treated by the treatment area, and a disinfection pond; the disinfection pond is used for collecting water in the water storage pond, and the water is discharged into the culture ponds after disinfection treatment.

8. The potty intensive care system of claim 7, wherein the water storage capacity of the water reservoir and the disinfection pond is 1.5 to 3.0 times the water change capacity of all the culture ponds.

9. The potty intensive care system of claim 1, wherein the blowdown system is a double blowdown system.

10. The potty intensive care system of claim 1, wherein the sewer system comprises a drain, a drain pipe, and a chassis; a water inlet communicated with the culture pond is formed in the upper end of the drain pipe, and a water outlet is formed in the lower end of the drain pipe in a bent mode; the chassis is of a pot bottom-shaped structure with an open upper end, the periphery of the drain pipe is sleeved with the chassis, the chassis is positioned between the water inlet and the water outlet, and the upper end of the chassis is flush with the inner bottom surface of the culture pond; one end of the drain pipe is communicated with the water outlet, and the other end of the drain pipe is communicated with the inner side wall of the chassis along the horizontal tangential direction of the chassis.

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