阅读说明：本技术 一种淡水渔业的循环水养殖系统及该系统的养殖方法 (Circulating water aquaculture system for freshwater fishery and aquaculture method of system ) 是由 邓康裕 邓登 易新文 于 2021-10-14 设计创作，主要内容包括：本发明涉及水产养殖领域,特别是指一种淡水渔业的循环水养殖系统及该系统的养殖方法,该系统包括箱体、溢水管、蓄水池和过滤池。养殖鱼苗的箱体的溢水台上贯穿有溢水管。过滤池内可上下滑动的设有空心活塞块,活塞块上贯穿有若干通孔,过滤池两端的进水口、出水口和通孔处均设有单向阀,活塞块内竖向依次设有过滤棉层、中级过滤层、高级过滤层和活性炭过滤层。蓄水池内设有过滤网架。溢水管通过排水管与进水口相连接,出水口与蓄水池的导水管相连接,蓄水池的导液管与箱体的进水管相连接。在操作时,使循环水依次穿过过滤棉层、中级过滤层、高级过滤层、活性炭过滤层和过滤网架,以进行多次过滤、除味,提高循环水水质,使鱼苗存活率提高。(The invention relates to the field of aquaculture, in particular to a circulating water aquaculture system for freshwater fishery and a aquaculture method of the system. An overflow pipe penetrates through an overflow platform of the box body for culturing the fish fries. The filtering pond is internally provided with a hollow piston block which can slide up and down, the piston block is provided with a plurality of through holes in a penetrating way, the water inlets, the water outlets and the through holes at the two ends of the filtering pond are respectively provided with a check valve, and the piston block is internally vertically and sequentially provided with a filtering cotton layer, a middle-grade filtering layer, a high-grade filtering layer and an active carbon filtering layer. A filtering net rack is arranged in the reservoir. The overflow pipe is connected with the water inlet through a drain pipe, the water outlet is connected with a water guide pipe of the reservoir, and a liquid guide pipe of the reservoir is connected with a water inlet pipe of the box body. During operation, circulating water sequentially passes through the filtering cotton layer, the middle-stage filtering layer, the high-stage filtering layer, the activated carbon filtering layer and the filtering net frame to carry out filtering and deodorizing for many times, so that the quality of the circulating water is improved, and the survival rate of fish fries is improved.)

1. The utility model provides a recirculating aquaculture system of fresh water fishery which characterized in that, including:

the fish fry breeding box comprises a box body, a fish fry breeding device and a fish fry breeding device, wherein the box body is used for breeding fish fries, an overflow platform is arranged in the box body, a blocking net is arranged on the overflow platform, and the blocking net is used for blocking the fish fries in the box body;

the overflow pipe is arranged inside the blocking net and penetrates through the overflow platform downwards, the overflow pipe is used for enabling redundant water in the box body to continuously overflow, the overflow pipe is of a telescopic structure, and the overflow height of an upper pipe orifice of the overflow pipe is always lower than the top height of the blocking net;

the filter comprises a filter tank, wherein the upper end and the lower end of the filter tank are respectively provided with a water inlet and a water outlet, a piston block is arranged in the filter tank and can slide up and down, the water inlet and the water outlet are respectively arranged on two sides of the piston block, the piston block is of a hollow structure, a plurality of through holes are respectively penetrated through the upper surface and the lower surface of the piston block, check valves are respectively arranged at the water inlet, the water outlet and the through holes, the check valves are used for enabling the water in the filter tank to flow from the water inlet to the water outlet, and a filter cotton layer, a middle-stage filter layer, a high-stage filter layer and an active carbon filter layer are vertically and sequentially and horizontally arranged in the piston block;

the water filter comprises a water storage tank, wherein a filter screen frame is arranged in the water storage tank and is used for filtering water in the water storage tank;

the bottom of the overflow pipe is connected with the water inlet through a drain pipe, the water outlet is connected with a water guide pipe of the reservoir, and a liquid guide pipe of the reservoir is connected with a water inlet pipe of the box body.

2. The recirculating aquaculture system of freshwater fishery as claimed in claim 1, wherein: the overflow pipe consists of a threaded pipe and an outer pipe, the outer pipe is fixedly arranged in the overflow platform, the threaded pipe is rotatably arranged in the outer pipe, a threaded pipe sleeve is fixed at the top of the outer pipe, and the threaded pipe sleeve is in threaded connection with the threaded pipe.

3. The recirculating aquaculture system of freshwater fishery as claimed in claim 2, wherein: the inside of screwed pipe is equipped with from the driving wheel, should be the internal gear from the driving wheel, mesh mutually with the drive wheel of arranging the screwed pipe in from the driving wheel, and this drive wheel passes through actuating lever and a motor rotatable coupling, and a motor is fixed in through the mounting bracket block on the net, it has a plurality of holes of stepping down to run through on the drive wheel, should step down the hole and be used for making the intraductal rivers of screwed pipe flow in the outer tube.

4. The recirculating aquaculture system of freshwater fishery as claimed in claim 1, wherein: the upper surface of the piston block is provided with a piston rod, the outer surface of the piston rod is provided with threads, the piston rod penetrates through the filter tank upwards and then is in threaded connection with a sleeve, and the sleeve is rotatably arranged on the upper surface of the filter tank.

5. The recirculating aquaculture system of freshwater fishery as claimed in claim 4, wherein: the outer side of the sleeve is fixedly connected with a driven belt wheel, the driven belt wheel is connected with a main belt wheel through a belt, the main belt wheel is driven by a second motor in a motor box, and the motor box is arranged on the outer surface of the filter tank.

6. The recirculating aquaculture system of freshwater fishery as claimed in claim 4, wherein: the outer side of the piston rod is covered with a cover casing, the bottom of the cover casing is fixedly connected to the upper surface of the filter tank, and the belt movably penetrates through the side face of one side of the cover casing.

7. The recirculating aquaculture system of freshwater fishery as claimed in claim 4, wherein: be equipped with the maintenance mouth on the filtering ponds side, this maintenance mouth department detachable is equipped with the end cover, and one side that the piston piece is close to the maintenance mouth is equipped with the opening, and this opening part detachable is equipped with the apron, and the maintenance mouth is corresponding with the opening, the cotton layer of filtration, middle level filter layer, senior filter layer and the active carbon filter layer in the piston piece can pass opening and maintenance mouth in proper order and take out.

8. The recirculating aquaculture system of freshwater fishery according to claim 7, wherein: the filter cotton layer, the middle filter layer, the high filter layer and the activated carbon filter layer are all provided with grooves on one side end faces close to the cover plate, and hook rods are arranged in the middle of the grooves.

9. The recirculating aquaculture system of freshwater fishery as claimed in claim 1, wherein: an aeration pipe is arranged in the water storage tank and used for providing ozone into the water storage tank.

10. The method for cultivating the recirculating aquaculture system in the freshwater fishery according to any one of claims 1 to 9, comprising the following steps:

firstly, pumping water in a water storage tank into a box body through a water pump fixed on a liquid guide pipe;

secondly, water in the box body overflows to the overflow pipe and the drain pipe;

thirdly, starting a second motor, and driving a driven belt wheel to rotate by a main belt wheel through a belt so that the sleeve is positioned on the upper surface of the filter tank to rotate;

fourthly, the piston rod moves up and down under the action of the thread of the sleeve, so that the piston block is positioned in the filter tank and moves up and down;

fifthly, water on the lower side of the piston block is pressed to penetrate through the piston block and then flows to the upper side of the piston block through the pressure generated by the piston block on the water on the upper side and the lower side in the filter tank;

sixthly, water flow sequentially passes through the filtering cotton layer, the middle-stage filtering layer, the high-stage filtering layer and the active carbon filtering layer to carry out multiple filtering and odor removal in the process of passing through the piston block;

seventhly, water on the upper side of the piston block flows into the water storage tank from the water outlet and the water guide pipe under the upward moving pressure of the piston block;

eighthly, the water entering the reservoir flows to a liquid guide pipe of the reservoir after being filtered again by the filter net rack;

and ninthly, starting the air pump, providing ozone into the water storage tank through the aeration pipe, and oxidizing the water in the water storage tank by using the ozone.

Technical Field

The invention relates to the field of aquaculture, in particular to a circulating water aquaculture system for freshwater fishery and a aquaculture method of the system.

Background

The large-scale aquaculture of aquatic products enterprise needs to use a large amount of flowing water, and in order to reduce the waste of water resource, people can carry out the recycling with the water that overflows in the breed case at present to water economy resource and reduction breed cost, but at present to the purification treatment of circulating water body not fully satisfactory, often just be used for the breed after through simple deposit, filtration with the raw water, and the fry is very easy because of the harmful substance such as suspended solid in the water, colloidal substance, pathogenic bacteria, ammonia nitrogen, nitrous acid nitrogen and influences the survival rate.

Disclosure of Invention

Aiming at the defects brought forward by the background technology, the invention provides a circulating water aquaculture system for freshwater fishery and a aquaculture method of the system.

The invention adopts the following technical scheme:

the utility model provides a recirculating aquaculture system of fresh water fishery which characterized in that, including:

the fish fry breeding box comprises a box body, a fish fry breeding device and a fish fry breeding device, wherein the box body is used for breeding fish fries, an overflow platform is arranged in the box body, a blocking net is arranged on the overflow platform, and the blocking net is used for blocking the fish fries in the box body;

the overflow pipe is arranged inside the blocking net and penetrates through the overflow platform downwards, the overflow pipe is used for enabling redundant water in the box body to continuously overflow, the overflow pipe is of a telescopic structure, and the overflow height of an upper pipe orifice of the overflow pipe is always lower than the top height of the blocking net;

the filter comprises a filter tank, wherein the upper end and the lower end of the filter tank are respectively provided with a water inlet and a water outlet, a piston block is arranged in the filter tank and can slide up and down, the water inlet and the water outlet are respectively arranged on two sides of the piston block, the piston block is of a hollow structure, a plurality of through holes are respectively penetrated through the upper surface and the lower surface of the piston block, check valves are respectively arranged at the water inlet, the water outlet and the through holes, the check valves are used for enabling the water in the filter tank to flow from the water inlet to the water outlet, and a filter cotton layer, a middle-stage filter layer, a high-stage filter layer and an active carbon filter layer are vertically and sequentially and horizontally arranged in the piston block;

the water filter comprises a water storage tank, wherein a filter screen frame is arranged in the water storage tank and is used for filtering water in the water storage tank;

the bottom of the overflow pipe is connected with the water inlet through a drain pipe, the water outlet is connected with a water guide pipe of the reservoir, and a liquid guide pipe of the reservoir is connected with a water inlet pipe of the box body.

As a further improvement, the overflow pipe consists of a threaded pipe and an outer pipe, the outer pipe is fixedly installed in the overflow platform, the threaded pipe is rotatably arranged in the outer pipe, a threaded pipe sleeve is fixed at the top of the outer pipe, and the threaded pipe sleeve is in threaded connection with the threaded pipe.

As further improvement, the inside of screwed pipe is equipped with from the driving wheel, should be the internal gear from the driving wheel, mesh mutually with the driving wheel of arranging the screwed pipe in from the driving wheel, and this driving wheel passes through actuating lever and a motor rotatable coupling, and a motor passes through the mounting bracket to be fixed in block on the net, it has a plurality of holes of stepping down to run through on the driving wheel, should step down the hole and be used for making the intraductal rivers of screwed pipe flow to the outer tube in.

As a further improvement, the upper surface of the piston block is provided with a piston rod, the outer surface of the piston rod is provided with threads, the piston rod penetrates through the filter tank upwards and then is in threaded connection with a sleeve, and the sleeve is rotatably arranged on the upper surface of the filter tank.

As a further improvement, the outer side of the sleeve is fixedly connected with a driven belt wheel, the driven belt wheel is connected with a main belt wheel through a belt, the main belt wheel is driven by a second motor in a motor box, and the motor box is arranged on the outer surface of the filter tank.

As a further improvement, the piston rod is covered with a cover on the outer side, the bottom of the cover is fixedly connected to the upper surface of the filter tank, and the belt movably penetrates through one side face of the cover.

As a further improvement, be equipped with the maintenance mouth on the filtering ponds side, this maintenance mouth department detachable is equipped with the end cover, and the piston piece is close to one side of maintenance mouth and is equipped with the opening, and this opening part detachable is equipped with the apron, and the maintenance mouth is corresponding with the opening, the cotton layer of filtration, middle level filter layer, senior filter layer and the active carbon filter layer in the piston piece can pass opening and maintenance mouth in proper order and take out.

As a further improvement, the end faces of one side, close to the cover plate, of the filtering cotton layer, the middle-stage filtering layer, the high-stage filtering layer and the activated carbon filtering layer are provided with grooves, and the middle parts of the grooves are provided with hook rods.

As a further improvement, an aeration pipe is arranged in the water storage tank and is used for providing ozone into the water storage tank.

A culture method of a circulating water culture system in freshwater fishery is characterized by comprising the following steps:

firstly, pumping water in a water storage tank into a box body through a water pump fixed on a liquid guide pipe; secondly, water in the box body overflows to the overflow pipe and the drain pipe; thirdly, starting a second motor, and driving a driven belt wheel to rotate by a main belt wheel through a belt so that the sleeve is positioned on the upper surface of the filter tank to rotate; fourthly, the piston rod moves up and down under the action of the thread of the sleeve, so that the piston block is positioned in the filter tank and moves up and down; fifthly, water on the lower side of the piston block is pressed to penetrate through the piston block and then flows to the upper side of the piston block through the pressure generated by the piston block on the water on the upper side and the lower side in the filter tank; sixthly, water flow sequentially passes through the filtering cotton layer, the middle-stage filtering layer, the high-stage filtering layer and the active carbon filtering layer to carry out multiple filtering and odor removal in the process of passing through the piston block; seventhly, water on the upper side of the piston block flows into the water storage tank from the water outlet and the water guide pipe under the upward moving pressure of the piston block; eighthly, the water entering the reservoir flows to a liquid guide pipe of the reservoir after being filtered again by the filter net rack; and ninthly, starting the air pump, providing ozone into the water storage tank through the aeration pipe, and oxidizing the water in the water storage tank by using the ozone.

From the above description of the structure of the present invention, compared with the prior art, the present invention has the following advantages: the system comprises a box body, an overflow pipe, a reservoir and a filter tank. An overflow pipe penetrates through an overflow platform of the box body for culturing the fish fries. The filtering pond is internally provided with a hollow piston block which can slide up and down, the piston block is provided with a plurality of through holes in a penetrating way, the water inlets, the water outlets and the through holes at the two ends of the filtering pond are respectively provided with a check valve, and the piston block is internally vertically and sequentially provided with a filtering cotton layer, a middle-grade filtering layer, a high-grade filtering layer and an active carbon filtering layer. A filtering net rack is arranged in the reservoir. The overflow pipe is connected with the water inlet through a drain pipe, the water outlet is connected with a water guide pipe of the reservoir, and a liquid guide pipe of the reservoir is connected with a water inlet pipe of the box body. During operation, circulating water sequentially passes through the filtering cotton layer, the middle-stage filtering layer, the high-stage filtering layer, the activated carbon filtering layer and the filtering net frame to carry out filtering and deodorizing for many times, so that the quality of the circulating water is improved, and the survival rate of fish fries is improved.

Drawings

Fig. 1 is a schematic cross-sectional structure of the present invention.

Fig. 2 is a schematic view showing a connection structure of the overflow pipe, the driven wheel, the driving wheel and the first motor.

Fig. 3 is a schematic structural diagram of a in fig. 2.

Fig. 4 is a schematic top view of the overflow pipe, the driven wheel and the driving wheel.

Fig. 5 is a schematic sectional structure view of the filter tank and the piston block.

Fig. 6 is a schematic sectional view of the piston block.

Fig. 7 is a schematic structural view of the piston block with the activated carbon filter layer removed.

Fig. 8 is a sectional structure diagram of the piston rod and the housing.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

As shown in the attached figure 1, the circulating aquaculture system for fresh water fishery comprises a box body 1, an overflow pipe 3, a water storage tank 5 and a filter tank 6.

As shown in the attached drawing 1, the box body 1 is used for culturing fish fries, the overflow platform 11 is arranged in the box body 1, the blocking net 2 is arranged on the overflow platform 11, the blocking net 2 is used for blocking the fish fries in the box body 1, the fish fries are prevented from flowing out of the box body 1 from the overflow pipe 3, accordingly, loss and waste of the fish fries are reduced, and the culture rate is improved.

As shown in fig. 1, the overflow pipe 3 is disposed inside the barrier net 2, the overflow pipe 3 penetrates the overflow platform 11 downwards, the overflow pipe 3 is used for enabling excess water in the tank 1 to overflow continuously to realize water circulation, the overflow pipe 3 is of a telescopic structure, specifically, as shown in fig. 2 and 3, the overflow pipe 3 is composed of a threaded pipe 31 and an outer pipe 32, the outer pipe 32 is fixedly installed in the overflow platform 11, the outer pipe 32 is rotatably provided with the threaded pipe 31 inside, the top of the outer pipe 32 is fixed with a threaded pipe sleeve 321, and the threaded pipe sleeve 321 is in threaded connection with the threaded pipe 31, when in operation, the threaded pipe 31 can be rotated to enable the threaded pipe 31 to move up and down along the inner wall of the outer pipe 32 under the threaded force of the fixed threaded pipe sleeve 321, and the height of the water stored in the tank 1 can be changed by adjusting the height of the threaded pipe 31, when needs take out ripe fry in the box 1, can make earlier that screwed pipe 31 moves down and contracts in the outer tube 32, make unnecessary water can be followed screwed pipe 31 overflow and saved in filtering ponds 6 and cistern 5 in the box 1, the circulation, too much waste of box 1 water-logging when reducing the fry, thereby the water economy resource, and the reduction of box 1 water-logging can be favorable to the concentration of fry in the box 1, so that the fisherman salvages ripe fry in the box 1 fast, avoid muddy water to touch the time waste that the fish caused, thereby accelerate the results of fry.

As shown in fig. 2, 3 and 4, specifically, the interior of the threaded pipe 31 is provided with a driven wheel 311, the driven wheel 311 is an internal gear, the driven wheel 311 is engaged with a driving wheel 44 disposed inside the threaded pipe 31, the driving wheel 44 is rotatably connected with a first motor 41 through a driving rod 43, the first motor 41 is fixed on the barrier net 2 through a mounting bracket 42, a plurality of abdicating holes 441 are formed in the driving wheel 44, the abdicating holes 441 are used for allowing water inside the threaded pipe 31 to flow into the outer pipe 32, when in operation, the first motor 41 is started to drive the driving wheel 44 to rotate, and then the driven wheel 311 and the threaded pipe 31 engaged therewith are driven to rotate together, and since the threaded pipe 31 is threadedly connected with a threaded pipe sleeve 321 on the outer pipe 32, and the threaded pipe sleeve 321 is fixed, the threaded pipe 31 moves up and down along the inner wall of the outer pipe 32 under the action of the threaded pipe sleeve 321, so as to adjust the height of the threaded pipe 31 and thus the water level in the tank 1. And the overflow height of the upper pipe orifice of the overflow pipe 3 is always lower than the top height of the blocking net 2, so that the water overflowing from the overflow pipe 3 is intercepted by the blocking net 2, and the fry is prevented from overflowing and losing from the overflow pipe 3.

As shown in fig. 5, a piston block 61 is slidably disposed in the filter tank 6, specifically, a piston rod 77 is disposed on the upper surface of the piston block 61, a thread is disposed on the outer surface of the piston rod 77, the piston rod 77 is connected to a sleeve 76 by a thread after penetrating through the filter tank 6, the sleeve 76 is rotatably disposed on the upper surface of the filter tank 6 through a bearing, a secondary pulley 75 is fixedly connected to the outer side of the sleeve 76, the secondary pulley 75 is connected to a primary pulley 73 through a belt 74, the primary pulley 73 is driven by a secondary motor 72 in a motor box 71, the motor box 71 is disposed on the outer surface of the filter tank 6, when in operation, the secondary motor 72 is activated, the primary pulley 73 rotates the secondary pulley 75 through the belt 74, so that the sleeve 76 is located on the upper surface of the filter tank 6, and the piston rod 77 moves up and down under the action of the thread of the sleeve 76 due to the sleeve 76 being fixed in position, thereby moving the piston block 61 up and down within the filtration tank 6. In addition, as shown in fig. 8, the piston rod 77 is covered by a cover 78, the bottom of the cover 78 is fixedly connected to the upper surface of the filter tank 6, and the belt 74 movably penetrates through one side of the cover 78, the cover 78 is arranged to prevent the piston rod 77 from being exposed to the outside air, which results in dust deposition on the surface of the piston rod 77, and then the dust enters the filter tank 6 along with the piston rod 77, which causes secondary pollution to the water in the filter tank 6.

Further, as shown in fig. 1 and 5, the upper end and the lower end of the filtering tank 6 are respectively provided with a water inlet 62 and a water outlet 63, the water inlet 62 and the water outlet 63 are respectively arranged at two sides of the piston block 61, the piston block 61 is of a hollow structure, a plurality of through holes 611 penetrate through the upper surface and the lower surface of the piston block 61, check valves 64 are arranged at the water inlet 62, the water outlet 63 and the through holes 611, the check valves 64 are used for enabling the water in the filtering tank 6 to flow only from the water inlet 62 to the water outlet 63, a filtering cotton layer 612, a middle filtering layer 613, a high filtering layer 614 and an activated carbon filtering layer 615 are vertically and horizontally arranged in the piston block 61 in sequence, when the piston block 61 is located in the filtering tank 6 and moves up and down, water located at the lower side of the piston block 61 is forced to pass through the through holes 611 to enter the piston block 61 and then flows from the through holes 611 at the upper surface of the piston block 61 to the upper side of the piston block 61 due to the pressure generated by the piston block 61, while the water flow passes through the piston block 61, the water flow passes through the filter cotton layer 612, the middle filter layer 613, the high filter layer 614 and the activated carbon filter layer 615 in sequence to realize multiple times of filtering and odor removal of the water in the filter tank 6 so as to improve the quality of the water flowing to the upper side of the piston block 61, and finally the water on the upper side of the piston block 61 flows from the water outlet 63 to the water storage tank 5 for storage and circulation under the upward pressure of the piston block 61, wherein the one-way valve 64 is arranged to ensure that the water in the filter tank 6 only flows from the water inlet 62 to the water outlet 63 so as to promote the circulation of the water.

As shown in fig. 5, 6 and 7, a maintenance opening 65 is arranged on the side surface of the filter tank 6, an end cover 66 is detachably arranged at the maintenance opening 65, an opening 619 is arranged on one side of the piston block 61 close to the maintenance opening 65, a cover plate 616 is detachably arranged at the opening 619 through a screw, the maintenance opening 65 corresponds to the opening 619, and the filter cotton layer 612, the middle filter layer 613, the high filter layer 614 and the activated carbon filter layer 615 in the piston block 61 can be taken out through the opening 619 and the maintenance opening 65 in sequence, so that the filter cotton layer 612, the middle filter layer 613, the high filter layer 614 and the activated carbon filter layer 615 can be replaced and cleaned conveniently. Furthermore, the end faces of the filter cotton layer 612, the middle filter layer 613, the high filter layer 614 and the activated carbon filter layer 615 close to the cover plate 616 are provided with grooves 617, the middle parts of the grooves 617 are provided with hook rods 618, when the filter cotton layer 612, the middle filter layer 613, the high filter layer 614 or the activated carbon filter layer 615 are taken out, fingers can hook the hook rods 618, so that the filter cotton layer 612, the middle filter layer 613, the high filter layer 614 or the activated carbon filter layer 615 can be pulled out of the piston block 61.

As shown in fig. 1, a filter screen frame 51 is arranged in the reservoir 5, the filter screen frame 51 is used for filtering water in the reservoir 5, the bottom of the overflow pipe 3 is connected with the water inlet 62 through the water discharge pipe 13, the water outlet 63 is connected with the water guide pipe 53 of the reservoir 5, the water guide pipe 54 of the reservoir 5 is connected with the water inlet pipe 12 of the box body 1, when in operation, water in the reservoir 5 is pumped into the box body 1 through the water pump fixed on the water guide pipe 54, water in the box body 1 flows into the filter tank 6 through the overflow pipe 3 and the water discharge pipe 13 for filtering and deodorizing, and finally, the treated water in the filter tank 6 flows into the reservoir 5 again, so that the water is recycled, water resources are saved, and the cultivation cost is reduced. Further, as shown in the attached drawing 1, be equipped with aeration pipe 52 in the cistern 5, the external air pump of aeration pipe 52, start the start-up, provide ozone in to cistern 5 through aeration pipe 52, the powerful oxidation that utilizes ozone handles the water in the cistern 5, not only can kill most bacterium, harmful microorganism such as virus, can also make the turbidity of water reduce, increase the dissolved oxygen volume in aquatic, also can make the ammonia nitrogen oxidation of aquatic get rid of, with the probability that reduces the fry morbidity, make the fry survival rate improve.

In operation, water in the water reservoir 5 is pumped into the tank 1 by the water pump fixed on the liquid guide tube 54, the water in the tank 1 overflows to the overflow pipe 3 and the water discharge pipe 13, the second motor 72 is started, the main belt wheel 73 drives the secondary belt wheel 75 to rotate by the belt 74, the sleeve 76 is positioned on the upper surface of the filter tank 6 to rotate, the sleeve 76 is not moved, the piston rod 77 moves up and down under the action of the thread force of the sleeve 76, the piston block 61 moves up and down in the filter tank 6, the water on the lower side of the piston block 61 pushes the check valve 64 open by pressure due to the pressure of the piston block 61 on the water on the upper side and the lower side in the filter tank 6, the check valve 64 passes through the through hole 611 into the piston block 61 and then flows from the through hole 611 on the upper surface of the piston block 61 to the upper side of the piston block 61, and the water flow passes through the filter cotton layer 612 and the water flow, The middle filter layer 613, the high filter layer 614 and the activated carbon filter layer 615 can filter and deodorize the water in the filter tank 6 for multiple times to improve the quality of the water flowing to the upper side of the piston block 61, and finally the water on the upper side of the piston block 61 flows from the water outlet 63 and the water guide pipe 53 to the reservoir 5 for storage and circulation under the upward pressure of the piston block 61, wherein the one-way valve 64 is arranged to ensure that the water in the filter tank 6 only flows from the water inlet 62 to the water outlet 63, and the water entering the reservoir 5 flows onto the liquid guide pipe 54 of the reservoir 5 after being filtered again by the filter net rack 51, so as to further improve the quality of the circulating water and improve the survival rate of the fry, and the air pump is started to provide ozone into the reservoir 5 through the aeration pipe 52, and the water in the reservoir 5 is treated by the strong oxidation effect of the ozone, thereby not only killing most bacteria, Viruses and other harmful microorganisms can reduce the turbidity of water, increase the dissolved oxygen in the water and oxidize and remove ammonia nitrogen in the water so as to reduce the incidence of the fry and further improve the survival rate of the fry.

A culture method of a circulating water culture system in freshwater fishery is characterized by comprising the following steps:

in a first step, water in the reservoir 5 is pumped into the tank 1 by means of a pump fixed to the catheter 54;

secondly, water in the box body 1 overflows to the overflow pipe 3 and the drain pipe 13;

thirdly, starting the second motor 72, driving the secondary belt wheel 75 to rotate by the primary belt wheel 73 through the belt 74, and enabling the sleeve 76 to be positioned on the upper surface of the filter tank 6 to rotate;

fourthly, the piston rod 77 moves up and down under the action of the thread of the sleeve 76, so that the piston block 61 is positioned in the filter tank 6 and moves up and down;

fifthly, the water on the lower side of the piston block 61 pushes the check valve 64 open by pressure through the through hole 611 to enter the piston block 61 and then flows to the upper side of the piston block 61 from the through hole 611 on the upper surface of the piston block 61 by the pressure of the piston block 61 on the water on the upper and lower sides in the filter tank 6;

sixthly, water flow sequentially passes through the filtering cotton layer 612, the middle-stage filtering layer 613, the high-stage filtering layer 614 and the activated carbon filtering layer 615 in the process of passing through the piston block 61 so as to realize multiple filtering and odor removal of water in the filtering tank 6 and improve the water quality of water flowing to the upper side of the piston block 61;

seventhly, water on the upper side of the piston block 61 flows into the water reservoir 5 from the water outlet 63 and the water guide pipe 53 by the upward pressure of the piston block 61 to be stored and circulated;

eighthly, the water entering the reservoir 5 flows to the liquid guide pipe 54 of the reservoir 5 after being filtered again by the filter net rack 51, the water quality of the circulating water is further improved, the survival rate of the fry is improved,

ninth step, start the air pump, provide ozone in to cistern 5 through aeration pipe 52, utilize the powerful oxidation of ozone to handle the water in the cistern 5, not only can kill harmful microorganism such as most bacterium, virus, can also make the turbidity of water reduce, increase the dissolved oxygen volume in the aquatic, also enable the ammonia nitrogen oxidation of aquatic and get rid of to reduce the probability that the fry morbidity, further make the fry survival rate improve.

The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.