Eel pond water purifying structure

Abstract

The application discloses a eel pond water body purification structure and relates to the technical field of aquaculture. The eel pond water body purification structure comprises a water changing device, a first filter device and a second filter device. The water changing device comprises a water inlet pump and a water outlet pump, and the water inlet pump and the water outlet pump are located between a culture tank and a filter tank. The first filter device comprises a first filter element, the first filter element is located in the culture tank and between the water inlet pump and the water outlet pump, and the first filter element is provided with a plurality of filter holes. The second filter device comprises a plurality of second filter elements, and the plurality of second filter elements are located in the filter tank. The filtering effects of the plurality of second filter elements are different, and the filtering effects of the plurality of second filter elements gradually increase along the water flow direction in the filter tank. The eel pond water body purification structure can keep a better eel culture environment in the eel pond, make the eel pond suitable for eel growth, and thus improve the survival rate of eel culture.

Description

Technical Field

[0001] This application relates to the technical field of aquaculture, and in particular to a water purification structure for eel ponds. Background Technology

[0002] Aquaculture is the practice of raising aquatic economic animals and plants using aquatic waters available for cultivation (including planting), according to the ecological habits of the cultivated species and their requirements for aquatic environmental conditions, and employing aquaculture technologies and facilities. Among these, eels, due to their tender flesh, high vitamin A content, and high fat and protein content (even surpassing chicken in nutritional value), have become a highly sought-after product in aquaculture.

[0003] Currently, eels are typically raised in eel ponds. During eel farming, eel feces and uneaten feed accumulate at the bottom of the pond. If not cleaned in time, these substances will produce harmful substances such as ammonia nitrogen under the action of anaerobic bacteria. This reduces the eels' resistance, induces various diseases, harms their health, lowers the survival rate of farmed eels, and increases farming risks.

[0004] Therefore, in order to improve the survival rate of eels, there is an urgent need for a water purification structure to improve the environment for eel farming in eel ponds. Summary of the Invention

[0005] This application provides a water purification structure for eel ponds, which can maintain a better environment for eel farming, making it suitable for eel growth and thus improving the survival rate of eel farming.

[0006] This application provides a water purification structure for eel ponds, employing the following technical solution:

[0007] A water purification structure for an eel pond is installed on an eel pond, which has a breeding tank and a filter tank, including a water exchange device, a first filter device and a second filter device.

[0008] The water exchange device includes an inlet pump and an outlet pump, both of which are located between the aquaculture tank and the filter tank. The two ends of the inlet pump are respectively connected to the top of the aquaculture tank and the top of the filter tank and can drive water in the filter tank into the aquaculture tank. The two ends of the outlet pump are respectively connected to the bottom of the aquaculture tank and the bottom of the filter tank and can drive water in the aquaculture tank into the filter tank.

[0009] The first filtration device includes a first filter element, which is located in the aquaculture tank and between the inlet pump and the outlet pump. The first filter element has a plurality of filter holes.

[0010] The second filtration device includes a plurality of second filter elements, all of which are located in the filter tank; the filtering effects of the plurality of second filter elements are different, and the filtering effect of the plurality of second filter elements gradually increases along the water flow direction in the filter tank.

[0011] By adopting the above technical solution, the feces and uneaten feed produced by eel farming will pass through the filter holes and enter the filter tank along with the water flow by the first filter element located at the bottom of the farming tank. The water will then be filtered by several second filter elements in the filter tank. Finally, the filtered water will be driven into the farming tank by the inlet pump, thereby purifying the water and maintaining a better environment for eel farming in the eel pond, making it suitable for eel growth and thus improving the survival rate of eel farming.

[0012] Optionally, the first filtration device further includes several guide members, which are disposed on the tank wall at the bottom of the aquaculture tank, and the guiding direction of the guide members is parallel to the direction in which the water flow is guided by the water pump.

[0013] By adopting the above technical solution, water pollutants such as feces and uneaten feed located at the bottom of the breeding tank can be easily driven by the water pump into the filter tank with the water flow.

[0014] Optionally, the bottom wall of the aquaculture tank is an inclined surface, and the end of the bottom wall of the aquaculture tank near the water pump is the lower inclined end.

[0015] By adopting the above technical solution, it is possible to further facilitate the flow of water pollutants such as feces and uneaten feed located at the bottom of the aquaculture tank into the filter tank by the water pump.

[0016] Optionally, the first filter device further includes a plurality of rotating parts, and the first filter part is provided with a plurality of clearance openings for mounting the rotating parts, and the plurality of filter holes are respectively located between adjacent clearance openings.

[0017] The rotating component is rotatably connected to the first filter element. The rotation axis of the rotating component is horizontal and perpendicular to the direction in which the water flow is guided by the water pump. The rotating component has several blades on its radial circumference about its own rotation axis. The blades can repeatedly pass through the first filter element as the rotating component rotates.

[0018] By adopting the above technical solution, during the process of the water pump driving pollutants from the aquaculture tank into the filter tank with the water flow, the water flow will drive several rotating parts to rotate. The rotation of the rotating parts can agitate the water and wash the upper surface of the first filter element, making it easier for pollutants to enter the bottom of the aquaculture tank through the filter holes. It also washes the bottom wall of the aquaculture tank, making it easier for pollutants to enter the filter tank with the water flow. At the same time, the agitation of the water by the rotating parts can promote the swimming of eels in the aquaculture tank, keeping the eels at a high level of vitality, thereby further improving the survival rate of eel farming and the final quality of eel farming.

[0019] Optionally, it also includes several cams, which are respectively disposed at both ends of several rotating parts along their own rotation axis. The eel pond has several movable grooves on both sides of the tank wall for the cams to move.

[0020] The first filter element is slidably connected to the eel pool. The sliding direction of the first filter element is horizontal and perpendicular to the rotation axis of the rotating element. Both sides of the movable groove have contact surfaces for contacting the cam. As the cam rotates with the rotating element, the cam contacts the two contact surfaces respectively. The cam can drive the first filter element to slide during its rotation and contact with the contact surfaces.

[0021] By adopting the above technical solution, as the rotating component rotates with the water flow, the cam will also rotate. The rotating cam can drive the first filter element to slide back and forth relative to the eel pond, thereby making it easier for pollutants to enter the bottom of the breeding tank through the filter holes and reducing the probability of pollutants remaining on the top of the first filter element.

[0022] Optionally, the second filtration device further includes a plurality of baffles that divide the filter tank into vertical S-shaped flow channels, with the outlet pump and the inlet pump located upstream and downstream of the flow channels; a plurality of second filter elements are distributed along the trajectory of the flow channels, and the filtration effect of the plurality of second filter elements gradually increases along the trajectory of the flow channels.

[0023] By adopting the above technical solution, the flow time of water in the filter tank can be extended, thereby making the filtration effect of the second filter elements on the water flow in the filter tank more complete, and thus improving the filtration effect of the second filter device on pollutants in the water flow.

[0024] Optionally, the baffle is inclined in the filter tank, and the end of the baffle near the upstream of the flow channel is the inclined lower end.

[0025] By adopting the above technical solution, the pollutants intercepted by the second filter element can slide down the baffle after settling on the baffle, making the intercepted pollutants more concentrated in the filter tank and reducing the probability of the second filter element being blocked due to being free in the water flow.

[0026] Optionally, an installation port for installing the second filter element is formed between the baffle and the adjacent wall of the filter tank; the second filter element is inclined in the filter tank, and the second filter element and the adjacent baffle are inclined in the same direction and at the same angle.

[0027] By adopting the above technical solution, the pollutants intercepted by the second filter element can be concentrated on the first second filter element. At this time, the effect of the pollutants can improve the filtration effect of the second filter element, thereby enabling it to intercept more pollutants.

[0028] Optionally, a plurality of baffles and a plurality of second filter elements together divide the filter tank to form a plurality of filter spaces. The eel pond has a plurality of sludge collection tanks around the filter tank. The plurality of sludge collection tanks correspond one-to-one with the plurality of filter spaces, and the bottom of the sludge collection tanks is connected to the bottom of the corresponding filter space.

[0029] It also includes a sludge suction device, which is located on one side of the eel pond and is connected to several sludge collection tanks through several pipes.

[0030] By adopting the above technical solution, pollutants intercepted by the second filter element and subsequently concentrated on the second filter element can eventually enter the corresponding collection tank, and then be sucked out by the suction device for further treatment. This reduces the probability that pollutants will remain in the filter tank for a long time, causing them to produce harmful substances such as ammonia nitrogen under the action of anaerobic bacteria.

[0031] Optionally, the water changing device further includes a protective cover, which is located in the aquaculture tank and near the water inlet pump.

[0032] The protective cover has an interior cavity, and the cavity forms an inlet and an outlet on the protective cover. The inlet is connected to a plurality of the water inlet pumps, and the outlet is close to and faces the first filter element.

[0033] By adopting the above technical solution, the impact of water flow on eels when entering the aquaculture tank through the inlet pump can be reduced. At the same time, the water flow can be guided to flush the upper surface of the first filter element, thereby making it easier for pollutants to enter the bottom of the aquaculture tank through the filter holes.

[0034] In summary, this application includes at least one of the following beneficial effects:

[0035] 1. It can purify water through water circulation, reduce the content of pollutants such as feces and uneaten feed in the eel farming environment, improve the water environment of eel farming, and make the water environment in the farming tank more suitable for eel growth, thereby improving the survival rate of eel farming.

[0036] 2. It can facilitate the entry of pollutants from the breeding tank into the filter tank, and at the same time can agitate the water to stimulate the eels to swim, so that the eels can maintain high vitality during the breeding process, thereby further improving the survival rate of eel farming and the final quality of the eels.

[0037] 3. It enables pollutants in the water flow to be filtered more thoroughly and evenly in the filter tank, improving the water purification effect. At the same time, it makes it easier to remove the filtered pollutants from the filter tank, reducing the probability that pollutants will remain in the filter tank for a long time and produce harmful substances such as ammonia nitrogen under the action of anaerobic bacteria. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of an eel pond equipped with a water purification structure according to an embodiment of this application;

[0039] Figure 2 This is a cross-sectional view of an eel pond equipped with a water purification structure according to an embodiment of this application;

[0040] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0041] Figure 4 yes Figure 2 Enlarged view of point B in the middle.

[0042] Explanation of reference numerals in the attached drawings: 1. Eel pond; 11. Culture tank; 12. Filter tank; 13. Moving tank; 131. Contact surface; 14. Flow channel; 15. Installation port; 16. Filtration space; 17. Sludge collection tank; 2. Water exchange device; 21. Inlet pump; 22. Outlet pump; 23. Protective cover; 231. Cavity; 232. Inlet; 233. Outlet; 3. First filtration device; 31. First filter element; 311. Clearance port; 32. Guide element; 33. Rotating element; 331. Blade; 34. Cam; 4. Second filtration device; 41. Second filter element; 42. Baffle; 5. Filter hole; 6. Filter screen; 7. Sludge suction device; 71. Sludge suction pipe. Detailed Implementation

[0043] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0044] This application discloses a water purification structure for eel ponds, which is installed on eel ponds and uses water circulation to purify the water in the eel ponds, thereby improving the breeding environment of the eel ponds and making it more suitable for eel growth, thus improving the survival rate of eel farming.

[0045] Reference Figure 1 and Figure 2 The eel pond 1 has a rectangular parallelepiped structure. It includes a rearing tank 11 for raising eels and a filter tank 12 for filtering out pollutants such as feces and uneaten feed from the water. Preferably, both the rearing tank 11 and the filter tank 12 are rectangular parallelepipeds. The rearing tank 11 and the filter tank 12 are spaced apart along the length of the eel pond 1. The lengths of the rearing tank 11 and the filter tank 12 are parallel to each other and parallel to the width of the eel pond 1. Both the rearing tank 11 and the filter tank 12 have openings at their top surfaces.

[0046] The water purification structure includes a water exchange device 2, a first filter device 3, and a second filter device 4. The water exchange device 2 is used to exchange water in the aquaculture tank 11 with water in the filter tank 12; the first filter device 3 is used to filter pollutants in the water in the aquaculture tank 11, facilitating their entry into the filter tank 12 with the water flow; and the second filter device 4 is used to filter pollutants in the water in the filter tank 12, reducing the amount of pollutants entering the aquaculture tank 11 with the water flow.

[0047] The water exchange device 2 includes several inlet pumps 21 and several outlet pumps 22, all of which are fixedly installed inside the eel pond 1 and located between the breeding tank 11 and the filter tank 12. The inlet pumps 21 are positioned near the top of the eel pond 1, with both ends connected to the top of the breeding tank 11 and the top of the filter tank 12 via pipes, respectively. The inlet pumps 21 drive water from the top of the filter tank 12 into the top of the breeding tank 11. The outlet pumps 22 are positioned near the bottom of the eel pond 1, with both ends connected to the bottom of the breeding tank 11 and the bottom of the filter tank 12 via pipes, respectively. The outlet pumps 22 drive water from the bottom of the breeding tank 11 into the bottom of the filter tank 12. In this embodiment, it is preferable that both the inlet pumps 21 and the outlet pumps 22 are water pumps. Since water pumps are common existing technology, they will not be described in detail here, and are only briefly shown in the accompanying drawings.

[0048] Furthermore, when the water exchange device 2 is running, several inlet pumps 21 and several outlet pumps 22 work simultaneously to keep the total amount of water in the aquaculture tank 11 and the total amount of water in the filter tank 12 relatively constant.

[0049] The first filter device 3 is installed in the aquaculture tank 11, and the first filter device 3 includes a first filter element 31.

[0050] The first filter element 31 has a rectangular plate-like structure. The first filter element 31 is located in the breeding tank 11 in a horizontal position. The first filter element 31 divides the breeding tank 11 into two independent spaces, and the two independent spaces are respectively connected to the inlet pump 21 and the outlet pump 22.

[0051] Reference Figure 2 and Figure 3 The first filter element 31 has several filter holes 5, and the size of the filter holes 5 is sufficient to allow pollutants such as feces and uneaten feed generated during eel farming to pass through. The space above the first filter element 31 in the farming tank 11 (i.e., the top of the farming tank 11) is the activity space for eel farming. Pollutants generated during eel farming will fall onto the first filter element 31 under their own gravity and can accumulate in the space below the first filter element 31 in the farming tank 11 (i.e., the bottom of the farming tank 11) through the filter holes 5, reducing the impact of pollutants on eel growth.

[0052] Meanwhile, the first filter element 31 can effectively prevent eels from swimming close to the water pump 22, thereby effectively reducing the impact of the water pump 22 on the growth of eels in the breeding tank 11 when it is working.

[0053] Furthermore, to reduce the impact of the water inlet pump 21 on the growth of eels in the aquaculture tank 11 during operation, the water exchange device 2 also includes a protective cover 23.

[0054] The protective cover 23 is fixedly installed on the tank wall of the aquaculture tank 11 near the filter tank 12. The interior of the protective cover 23 has a cavity 231, which forms an inlet 232 for water to enter and an outlet 233 for water to exit. After the protective cover 23 is installed, several water pumps 21 are connected to the cavity 231 through the inlet 232, and the outlet 233 is located above and close to the first filter element 31. In this embodiment, it is preferable that the water flows vertically downwards when it flows out of the outlet 233. This reduces the probability of the water directly contacting the eels after entering the aquaculture tank 11, and also guides the water flow to flush the upper surface of the first filter element 31, facilitating the entry of pollutants located on the upper surface of the first filter element 31 into the bottom of the aquaculture tank 11 through the filter holes 5.

[0055] Furthermore, the first filtration device 3 also includes several guide members 32. The guide members 32 are generally elongated and are fixedly installed on the bottom wall of the aquaculture tank 11. The length direction of the guide members 32 is parallel to the width side of the bottom wall of the aquaculture tank 11, and the guide members 32 are evenly distributed on the bottom wall of the aquaculture tank 11 along the width direction of the eel pond 1.

[0056] After the pollutants in the aquaculture tank 11 are concentrated at the bottom of the aquaculture tank 11, the water pump 22 drives the water in the aquaculture tank 11 into the filter tank 12. During this process, the guide component 32 can guide the direction of the pollutants moving with the water flow, so that the pollutants can easily enter the filter tank 12 with the water flow.

[0057] Furthermore, the bottom wall of the aquaculture tank 11 is inclined, with the end near the water pump 22 being the lower inclined end. At this time, the pollutants located at the bottom of the aquaculture tank 11 can move along the bottom wall of the aquaculture tank 11 towards the water pump 22 under their own gravity, thereby facilitating the pollutants to enter the filter tank 12 with the water flow.

[0058] Furthermore, the first filter device 3 also includes several rotating parts 33. Several clearance openings 311 for mounting the rotating parts 33 are equally spaced along the width direction of the first filter part 31. Several filter holes 5 are provided between adjacent clearance openings 311.

[0059] The rotating component 33 is rotatably connected to the first filter element 31, and the rotation axis of the rotating component 33 is parallel to the length direction of the first filter element 31. The rotating component 33 has a plurality of blades 331, which are arranged in a circular array around the rotation axis of the rotating component 33. During the rotation of the rotating component 33, the blades 331 can reciprocate in and out of the space above and below the first filter element 31, and pollutants in the aquaculture tank 11 can also pass through the first filter element 31 through the gap between the rotating component 33 and the inner wall of the relief port 311.

[0060] When the water pump 22 drives the water at the bottom of the aquaculture tank 11 into the bottom of the filter tank 12, the water flow at the bottom of the aquaculture tank 11 can drive several rotating parts 33 to rotate. At this time, the rotating parts 33 can agitate the surrounding water, which can form a water flow to wash the upper surface of the first filter element 31, thereby making it easier for pollutants to enter the bottom of the aquaculture tank 11 through the filter holes 5; at the same time, it can also form a water flow to wash the tank wall at the bottom of the aquaculture tank 11, thereby making it easier for pollutants at the bottom of the aquaculture tank 11 to enter the filter tank 12 with the water flow.

[0061] In addition, while the rotating component 33 rotates and stirs the surrounding water, it can also stimulate the eels above the first filter component 31, making the eels swim more vigorously, increasing their vitality, and keeping them healthy during the breeding process. This can further improve the survival rate of eel farming and also improve the quality of the final eel product.

[0062] Furthermore, the first filter device 3 also includes a plurality of cams 34, which are respectively fixedly installed at both ends of a plurality of rotating parts 33. In this embodiment, the first filter device 3 preferably includes two cams 34, and preferably the two cams 34 are respectively fixedly installed at both ends of the rotating parts 33 closest to the water pump 22.

[0063] Cam 34 is located on both sides of the length direction of the first filter element 31. Two movable slots 13 are opened on the walls of the eel pond 1 on both sides of the length direction of the breeding tank 11 for cam 34 to move. Cam 34 can rotate with the rotating element 33 and move in the corresponding movable slot 13.

[0064] The first filter element 31 is slidably connected to the eel tank 1, and the sliding direction of the first filter element 31 is parallel to the length direction of the eel tank 1. The movable groove 13 has contact surfaces 131 on both sides along the sliding direction of the first filter element 31 for contacting the cam 34. As the cam 34 rotates with the rotating member 33, the protrusion of the cam 34 will contact the two contact surfaces 131 respectively. While the cam 34 rotates and maintains contact with one of the contact surfaces 131, the cam 34 will drive the first filter element 31 to slide in a certain direction relative to the eel tank 1; thus, as the cam 34 rotates with the rotating member 33, the first filter element 31 can slide back and forth relative to the eel tank 1.

[0065] During the reciprocating sliding of the first filter element 31 relative to the eel pond 1, the probability of pollutants remaining on the upper surface of the first filter element 31 can be reduced, thereby making it easier for pollutants to enter the bottom of the breeding tank 11 through the filter holes 5; at the same time, it can improve the stirring effect of the rotating element 33 on the surrounding water, thereby increasing the stimulation of the eel swimming by the rotation of the rotating element 33.

[0066] Reference Figure 2 and Figure 4 The second filter device 4 is installed in the filter tank 12. The second filter device 4 includes a plurality of second filter elements 41 and a plurality of baffles 42. In this embodiment, the second filter device 4 preferably includes three second filter elements 41 and three baffles 42.

[0067] Three baffles 42 divide the filter tank 12 into vertical S-shaped flow channels 14, which guide the water in the filter tank 12 to flow upward in an S-shaped trajectory. During this process, the direction of the water flow remains perpendicular to the width direction of the eel tank 1. The outlet pump 22 is connected to the upstream position of the flow channel 14, and the inlet pump 21 is connected to the downstream position of the flow channel 14.

[0068] Furthermore, it is preferable that the baffle 42 is installed at an angle in the filter tank 12, with the end of the baffle 42 facing the direction of water flow being the inclined upper end.

[0069] The inclined lower end of the baffle 42 has an installation port 15 for installing the second filter element 41 on the side near the wall of the adjacent filter tank 12. The second filter element 41 has a rectangular plate-like structure. After the second filter element 41 is fixedly installed at the installation port 15, the second filter element 41 is also in an inclined position, and the inclination direction of the second filter element 41 and the corresponding baffle 42 are the same and the inclination angle is equal. At this time, the three filter elements and the three baffles 42 form four filtration spaces 16 in the filter tank 12.

[0070] The second filter element 41 also has a plurality of filter holes 5, and the size of the filter holes 5 on different second filter elements 41 is different, that is, the filtration effect of different second filter elements 41 is different. In this embodiment, since the filter holes 5 are common prior art, they are omitted from the drawings.

[0071] The filtration effect of the three second filter elements 41 gradually increases along the flow direction of the water in the filter tank 12, that is, the size of the filter hole 5 on the second filter element 41 that is installed higher in the filter tank 12 is smaller.

[0072] Furthermore, preferably, a filter screen 6 is fixedly installed on the top of the wall of the filter tank 12 near the breeding tank 11 in the eel pond 1. The filter screen 6 covers the position where the filter tank 12 communicates with several water inlet pumps 21, and the size of the mesh on the filter screen 6 is smaller than the size of the filter holes 5 on the second filter element 41 at the highest installation position. In this embodiment, since the filter screen 6 is a common prior art, it will not be described in detail here, and it is only briefly shown in the accompanying drawings.

[0073] At this time, as the pollutants entering the filter tank 12 flow along the flow channel 14 with the water, after the pollutants come into contact with the second filter element 41, the pollutants whose size does not meet the passage conditions will be intercepted by the second filter element 41 and retained in the corresponding filter space 16. The pollutants retained in the filter space 16 will fall onto the baffle 42 at the bottom of the filter space 16 under the action of their own gravity, and slide down along the baffle 42 onto the second filter element 41 at the bottom of the filter space 16.

[0074] Furthermore, the eel pond 1 has several collection tanks 17 for collecting pollutants around the filter tank 12. The collection tanks 17 correspond one-to-one with the filter spaces 16. Therefore, in this embodiment, it is preferable that the eel pond 1 has a total of four collection tanks 17.

[0075] One of the sludge collection tanks 17 is located at the bottom of the filter tank 12 and is connected to the filter space 16 located at the bottom of the filter tank 12 away from the outlet pump 22. The pollutants filtered and intercepted by the second filter element 41 with the lowest installation position can be concentrated in the sludge collection tank 17 under its own gravity.

[0076] The other three collection tanks 17 are located on both sides of the width of the filter tank 12. The collection tanks 17 are connected to the bottom of the corresponding filter space 16, so that the pollutants left in the corresponding filter space 16 can be concentrated in the corresponding collection tank 17 under their own gravity.

[0077] Reference Figure 1 and Figure 2 Furthermore, the water purification structure also includes a suction device 7 for removing pollutants from the filter tank 12. The suction device 7 is fixedly installed on one side of the eel pond 1 and close to the filter tank 12. Several suction pipes 71 extend from the suction device 7, penetrating the eel pond 1 and extending into several collection tanks 17. In this embodiment, preferably, the several suction pipes 71 correspond one-to-one with the several collection tanks 17, that is, preferably, the suction device 7 has a total of four suction pipes 71 connected to it.

[0078] In this embodiment, since the suction device 7 with the above-mentioned functions is a common existing technology, such as a slurry pump, it will not be described in detail here, and it is only briefly shown in the accompanying drawings.

[0079] The implementation principle of the eel pond water purification structure in this application embodiment is as follows:

[0080] Pollutants such as feces and uneaten feed generated during eel farming will first pass through the filter holes 5 on the first filter element 31 and be collected at the bottom of the farming tank 11. Then, several water pumps 22 will drive the water to flow and enter the bottom of the filter tank 12. Next, several water pumps 21 and several water pumps 22 will work together to drive the water in the filter tank 12 to flow along the flow channel 14. As the pollutants enter the filter tank 12, they will pass through several second filter elements 41. After being filtered and intercepted, the pollutants will be collected in the corresponding collection tank 17 under their own gravity. Subsequently, the pollutants in the collection tank 17 can be sucked out by the suction device 7 for further treatment.

[0081] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A water purification structure for an eel pond, disposed on an eel pond (1), the eel pond (1) having a culture tank (11) and a filter tank (12), characterized in that, The water changing device (2), the first filtering device (3) and the second filtering device (4) are included. The water changing device (2) includes a water inlet pump (21) and a water outlet pump (22), both of which are located between the culture tank (11) and the filtering tank (12), the two ends of the water inlet pump (21) are communicated with the top of the culture tank (11) and the top of the filtering tank (12) respectively and can drive the water in the filtering tank (12) to enter the culture tank (11), the two ends of the water outlet pump (22) are communicated with the bottom of the culture tank (11) and the bottom of the filtering tank (12) respectively and can drive the water in the culture tank (11) to enter the filtering tank (12). The first filtering device (3) includes a first filtering element (31), which is located in the culture tank (11) and between the water inlet pump (21) and the water outlet pump (22), and has a plurality of filtering holes (5) on the first filtering element (31). The second filtering device (4) includes a plurality of second filtering elements (41), each of which is located in the filtering tank (12); the filtering effects of the plurality of second filtering elements (41) are different, and the filtering effects of the plurality of second filtering elements (41) gradually increase along the water flow direction in the filtering tank (12). The first filtering device (3) further includes a plurality of rotating elements (33), and the first filtering element (31) further has a plurality of accommodation openings (311) for accommodating the rotating elements (33), and the plurality of filtering holes (5) are respectively located between adjacent accommodation openings (311). The rotating element (33) is rotationally connected with the first filtering element (31), the rotating axis of the rotating element (33) is horizontal and perpendicular to the direction in which the water flow is guided to move by the water outlet pump (22); the radial periphery of the rotating element (33) has a plurality of blades (331) with respect to the rotating axis of the rotating element (33), and the blades (331) can repeatedly pass through the first filtering element (31) during the rotation of the rotating element (33). A plurality of cams (34) are further included, each of which is arranged at both ends of the rotating element (33) along the rotating axis thereof, and a plurality of activity grooves (13) for the cams (34) to move are arranged on the two side walls of the eel pond (1) corresponding to the culture tank (11). The first filtering element (31) is slidingly connected with the eel pond (1), the sliding direction of the first filtering element (31) is horizontal and perpendicular to the rotating axis of the rotating element (33); the two sides of the activity groove (13) have contact surfaces (131) for contacting the cams (34), the cams (34) respectively contact the two contact surfaces (131) during the rotation of the rotating element (33), and the cams (34) can drive the first filtering element (31) to slide during the rotation and contact with the contact surfaces (131).

2. A water purification structure for eel ponds according to claim 1, characterized in that, The first filtering device (3) further comprises a plurality of guide members (32) arranged on the tank wall of the bottom of the culture tank (11), and the guide direction of the guide members (32) is parallel to the direction in which the water flow is guided to move by the water outlet pump (22).

3. A water purification structure for eel ponds according to claim 2, characterized in that, The tank wall of the bottom of the culture tank (11) is an inclined surface, and the end of the tank wall of the bottom of the culture tank (11) close to the water outlet pump (22) is an inclined lower end.

4. The eel pond water purifying structure according to claim 1, wherein The second filtering device (4) further comprises a plurality of baffles (42), and the plurality of baffles (42) separate the filtering tank (12) to form a vertical S-shaped flow channel (14), wherein the water outlet pump (22) and the water inlet pump (21) are located upstream and downstream of the flow channel (14); a plurality of second filtering members (41) are distributed along the track of the flow channel (14), and the filtering effect of the plurality of second filtering members (41) gradually increases along the track of the flow channel (14).

5. A water purification structure for eel ponds according to claim 4, characterized in that The baffle (42) is arranged obliquely in the filtering tank (12), and the end of the baffle (42) close to the upstream of the flow channel (14) is an inclined lower end.

6. A water purification structure for eel ponds according to claim 5, characterized in that The baffle (42) and the adjacent tank wall of the filtering tank (12) form a mounting opening (15) for mounting the second filtering member (41); the second filtering member (41) is arranged obliquely in the filtering tank (12), and the second filtering member (41) and the adjacent baffle (42) have the same oblique direction and equal oblique angles.

7. A water purification structure for eel ponds according to claim 6, characterized in that The plurality of baffles (42) and the plurality of second filtering members (41) together separate the filtering tank (12) to form a plurality of filtering spaces (16), and the eel pool (1) has a plurality of sewage collecting tanks (17) on the periphery of the filtering tank (12), wherein the plurality of sewage collecting tanks (17) correspond one-to-one to the plurality of filtering spaces (16), and the bottom of the sewage collecting tank (17) communicates with the corresponding filtering space (16). Further comprising a sewage suction device (7) arranged on one side of the eel pool (1), and the sewage suction device (7) communicates with the plurality of sewage collecting tanks (17) through a plurality of pipelines.

8. A water purification structure for eel ponds according to claim 1, characterized in that, The water changing device (2) further comprises a protective cover (23) located in the culture tank (11) and close to the water inlet pump (21). The protective cover (23) has a cavity (231) in the interior, and the cavity (231) forms an inlet (232) and an outlet (233) on the protective cover (23), wherein the inlet (232) communicates with the plurality of water inlet pumps (21), and the outlet (233) is close to and faces the first filtering member (31).

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