A water circulation and filtration device for raising bluestone catfish

Abstract

This invention relates to the field of aquatic animal breeding technology, specifically to a water circulation and filtration device for raising *Cetacea esculenta*, comprising a shell, a main filter element, and a secondary filter element. The main filter element includes a filter cartridge and a cleaning mechanism. The filter cartridge is disposed within the shell. The cleaning mechanism is mounted on the shell. The secondary filter element includes an adjusting disc, a moving disc, and multiple filter bags. The adjusting disc and multiple filter bags are all disposed within the filter cartridge, and the moving disc moves within the shell to abut against the filter cartridge. This invention's water circulation and filtration device for raising *Cetacea esculenta*, by setting the main and secondary filter elements on the shell and placing multiple filter bags within the filter cartridge, avoids occupying excessive space, extends the service life of the device, and improves the cleaning effect of the filter bags through backwashing, saving time and effort while enhancing the stability of the *Cetacea esculenta*'s living environment.

Description

Technical Field

[0001] This invention relates to the field of aquatic animal breeding technology, specifically to a water circulation and filtration device for breeding *Cyprinus spp.* (a type of catfish). Background Technology

[0002] The blue rock loach is a rare cold-water freshwater fish. Due to its unique habitat, overfishing, and ecological changes, this fish has become quite scarce. Therefore, simulated ecological domestication is one of the key measures to improve the survival rate and population of blue rock loach. The domestication process is usually divided into several stages, including pond construction, disinfection, catching wild fish, transportation, stocking experimental fish, and feeding. These steps aim to gradually adapt the blue rock loach to the artificial environment and improve its survival rate.

[0003] However, the Chinese sturgeon is susceptible to various diseases during its aquaculture, such as water mold, gill rot, red spot disease, and parasitic diseases. These diseases severely impact the health and survival rate of the Chinese sturgeon. Therefore, it is necessary to filter the water in the fishpond in a timely manner to ensure its cleanliness. Simultaneously, the filtered impurities should be treated, and the feces should be further analyzed and tested. By detecting pathogens such as parasites and bacteria in the feces, the health status of the Chinese sturgeon can be assessed, and veterinary drugs can be prepared based on this assessment, laying the foundation for the sustainable development of Chinese sturgeon aquaculture.

[0004] However, existing filtration devices occupy a large area but have a small filtration area, making them very inconvenient to use. Furthermore, the filter screens require frequent cleaning, which is not only time-consuming and laborious, but also affects the stability of the living environment of the rock bream if cleaning is not done in time. Summary of the Invention

[0005] This invention provides a water circulation filtration device for raising *Cyprinus spp.*, which solves the problems of existing filtration devices having a small filtration area and requiring frequent cleaning of the filter screen, which is not only time-consuming and labor-intensive, but also affects the stability of the living environment of *Cyprinus spp.* if cleaning is not timely.

[0006] The present invention provides a water circulation and filtration device for aquaculture of *Cetacea purpurea*, comprising a shell, a main filter element, and a secondary filter element. The main filter element includes a filter cylinder and a cleaning mechanism. The filter cylinder is arranged within the shell along a first direction, which is horizontal. The cleaning mechanism is mounted on the shell and is used to clean the filter cylinder. The two ends of the filter cylinder along the first direction are respectively referred to as the first end and the second end. The first end is sealed, and the second end is open in the first direction. The first end has a water inlet, and the shell has a water outlet. The secondary filter element includes an adjusting disc, a moving disc, a water supply mechanism, and multiple filter bags. The adjusting disc is located at the second end of the filter cylinder and is coaxial with the filter cylinder. The multiple filter bags are arranged along the first direction. Inside the cylinder, the two ends of the filter bag along the first direction are referred to as the head end and the tail end, respectively. The head end extends through the first direction, is fixed to the adjusting plate and extends out of the adjusting plate. In the initial state, the head end of the filter bag is connected to the inside of the shell. The filter bag has a supporting frame, so that one side of the tail end is suspended. The moving plate is coaxially arranged with the filter cylinder and can move in the first direction within the shell. The moving plate is located on the side of the adjusting plate away from the filter cylinder in the first direction. In the initial state, the moving plate does not abut against the filter cylinder. When the moving plate moves in the first direction within the shell towards the side of the adjusting plate, it can abut against the filter cylinder. A backwash chamber is defined between the moving plate, the adjusting plate and the filter cylinder. At this time, the head end of the filter bag is connected to the backwash chamber. The water supply mechanism is installed on the shell and is used to supply water to the backwash chamber.

[0007] Furthermore, the filter cartridge can rotate within the housing in a first direction, and the adjusting disc rotates in coordination with the filter cartridge; the cleaning mechanism includes a cleaning pipe, a receiving plate, and a drain pipe; the cleaning pipe is fixedly installed within the housing, and is located on the side of the filter cartridge away from the horizontal central axis of the filter cartridge in a second direction, which is perpendicular to the first direction and is the radial direction of the filter cartridge; multiple nozzles are evenly distributed along the first direction on the cleaning pipe, and all nozzles are connected to the cleaning pipe, which supplies water to the nozzles; the receiving plate is installed within the filter cartridge along the first direction, and the nozzles face the receiving plate; the liquid level in the filter cartridge is always lower than the height of the receiving plate in the third direction, which is a vertical direction; multiple filter bags are located below the receiving plate; the drain pipe is fixedly installed on the housing, and the receiving plate has an opening; one end of the drain pipe is fixedly connected to the receiving plate and is connected to the opening; the other end of the drain pipe extends out of the housing through the second end of the filter cartridge, and rotates in coordination with the filter cartridge and is fixedly connected to the housing.

[0008] Furthermore, the regulating disc includes an inner ring, an outer ring, and a sealing membrane; both the inner and outer rings are coaxially arranged with the filter cartridge and rotate with the filter cartridge. The inner and outer rings are connected by connecting ribs. The sealing membrane is a flexible structure and is fixed between the inner and outer rings. In the initial state, there are folds between the inner and outer rings of the sealing membrane. A float is fixedly installed on the sealing membrane. The float is located inside the filter cartridge and is located on the side of the multiple filter bags facing upwards towards the receiving disc.

[0009] Furthermore, multiple connecting pieces are fixedly installed on the sealing membrane. The multiple connecting pieces are evenly distributed on the sealing membrane around the first direction. The multiple connecting pieces are all located on the side of the float away from the inlet in the first direction, and the multiple connecting pieces are all located on the side of the float away from the receiving plate in the third direction. Every two filter bags are fixed on one connecting piece.

[0010] Furthermore, multiple connecting pieces are connected by adjusting pieces. The adjusting pieces are elastic and are arranged around the sealing membrane in a first direction and slide in cooperation with the sealing membrane. Both ends of the adjusting pieces in the first direction are provided with follower pieces. There are two floats, and the two floats are arranged in a one-to-one correspondence with the two follower pieces. The floats are fixedly connected to their corresponding follower pieces.

[0011] Furthermore, a hydraulic telescopic cylinder is provided on the housing, and the output end of the hydraulic telescopic cylinder is fixedly connected to the moving disc. The hydraulic telescopic cylinder is used to drive the moving disc to move in the first direction. A backflush port is provided on the moving disc, and the backflush port is connected to the backflush chamber. The water supply mechanism includes a third water pump, and the backflush port is connected to the third water pump through a telescopic pipe.

[0012] Furthermore, multiple connecting pieces are located at the lower part of the sealing membrane, and one of the connecting pieces is in a vertical state. A sealing ball is connected to the connecting piece via a first elastic element. The first elastic element is arranged along a first direction and always has the tendency to cause the sealing ball to move away from the sealing membrane along the first direction. Two pull ropes are fixed to the sealing ball. The pull ropes are elastic ropes and are respectively fixed to the connecting pieces arranged adjacent to each other along the first direction. The backflush port is coaxially arranged with the sealing ball in the first direction. The backflush port has a large end and a small end. The large end and the small end are arranged sequentially in the first direction, and the large end is located on the side of the small end closer to the sealing ball in the first direction.

[0013] Furthermore, a partition plate is fixedly installed inside the housing, dividing the housing into a first chamber and a second chamber. The filter cartridge is installed in the first chamber. A main water inlet is opened on the housing, and the main water inlet is connected to the water inlet on the filter cartridge through a connecting pipe. The main water inlet is connected to a first water pump. The cleaning mechanism also includes a second water pump, which is installed on the housing. The cleaning pipe is connected to the second water pump.

[0014] Furthermore, a collection box is connected to one end of the sewage pipe that extends out of the casing.

[0015] Furthermore, a motor is fixedly mounted on the housing, the output shaft of the motor extends into the housing along the first direction, a gear is fixedly connected to the output shaft of the motor, and a gear ring is coaxially and fixedly connected to the filter cartridge, the gear ring is located at the second end of the filter cartridge and meshes with the gear.

[0016] The beneficial effects of this invention are as follows: The water circulation filtration device for raising *Cetacea esculenta* of this invention, by setting a main filter element and a secondary filter element on the shell and setting multiple filter bags inside the filter cylinder, not only avoids occupying excessive space but also extends the service life of the water circulation filtration device for raising *Cetacea esculenta*. During normal use, the moving disc does not contact the filter cylinder, so the filtered water flows from the head end of the filter bag into the shell. When cleaning the filter cylinder and filter bags is required, the moving disc is driven to move in the first direction within the shell towards the adjusting disc, allowing the moving disc to contact the filter cylinder. At this time, the head end of the filter bag connects to the backwash chamber. Water is supplied to the backwash chamber through the water supply mechanism, and the water enters the filter bag from the backwash chamber, backwashing the filter bag and preventing clogging. The backwashing method improves the cleaning effect of the filter bag. Impurities after backwashing adhere to the inner surface of the filter cylinder and are cleaned by the cleaning mechanism, saving time and effort while improving the stability of the living environment for *Cetacea esculenta*. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a water circulation and filtration device for raising bluestone catfish according to the present invention;

[0019] Figure 2 This is a schematic diagram of the internal structure of the shell of an embodiment of a water circulation and filtration device for raising bluestone catfish according to the present invention;

[0020] Figure 3 This is a cross-sectional view of the overall structure of an embodiment of a water circulation and filtration device for raising blue-stone catfish according to the present invention;

[0021] Figure 4 This is a schematic diagram of the overall structure of an embodiment of a water circulation and filtration device for raising bluestone catfish according to the present invention, viewed from another perspective.

[0022] Figure 5 This is a cross-sectional view of the overall structure of an embodiment of a water circulation and filtration device for raising bluestone catfish according to the present invention, taken from another perspective.

[0023] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0024] Figure 7 This is a diagram showing the state of the movable disc and filter cartridge after contact is made between them, according to an embodiment of the water circulation and filtration device for raising bluestone catfish of the present invention.

[0025] Figure 8 This is a schematic diagram of the regulating disc and filter bag in an embodiment of a water circulation and filtration device for raising *Cyprinus purpurea* according to the present invention.

[0026] Figure 9 This is a schematic diagram of the regulating disc and filter bag from another perspective, representing an embodiment of a water circulation and filtration device for raising *Cyprinus purpurea* according to the present invention.

[0027] Figure 10 This is a cross-sectional view of the filter cylinder of an embodiment of a water circulation filtration device for raising blue-stone catfish according to the present invention.

[0028] In the diagram: 100, shell; 101, main water inlet; 110, partition plate; 120, second water pump; 130, motor; 140, gear; 150, hydraulic telescopic cylinder; 160, third water pump; 200, filter cartridge; 201, water inlet; 202, main cylinder; 203, support cylinder; 204, connecting rod; 210, gear ring; 300, cleaning mechanism; 310, cleaning pipe; 311, nozzle; 3 20. Receiving plate; 330. Sewage pipe; 340. Collection box; 400. Adjusting plate; 410. Inner ring; 420. Outer ring; 430. Sealing membrane; 431. Float; 432. Connecting piece; 433. Adjusting piece; 434. Follower piece; 440. First elastic element; 450. Sealing ball; 460. Pull rope; 500. Moving plate; 510. Backflush port; 600. Filter bag; 700. Backflush chamber. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] An embodiment of the water circulation and filtration device for raising *Cypripedium lancifolium* according to the present invention is as follows: Figures 1 to 10 As shown.

[0031] A water circulation filtration device for raising *Cetacea purpurea* is disclosed, used to filter water in fishponds for raising *Cetacea purpurea*. The device includes a housing 100, a main filter element, and a secondary filter element. The main filter element includes a filter cartridge 200 and a cleaning mechanism 300. The filter cartridge 200 is arranged within the housing 100 along a first direction, which is horizontal. A filter screen is provided on the filter cartridge 200. The cleaning mechanism 300 is installed on the housing 100 and used to clean the filter cartridge 200. The two ends of the filter cartridge 200 along the first direction are referred to as the first end and the second end, respectively. The first end is sealed, and the second end is open in the first direction. The first end has an inlet 201. The fishpond has an inlet and an outlet, with the inlet 201 connected to the outlet of the fishpond. The housing 100 has an outlet, which is connected to the inlet of the fishpond.

[0032] The secondary filter element includes an adjusting disc 400, a movable disc 500, a water supply mechanism, and multiple filter bags 600. The adjusting disc 400 is located at the second end of the filter cartridge 200 and is coaxial with the filter cartridge 200. Multiple filter bags 600 are arranged inside the filter cartridge 200 along a first direction. The two ends of each filter bag 600 along the first direction are referred to as the head end and the tail end, respectively. The head end extends through the first direction, is fixed to the adjusting disc 400, and extends beyond the adjusting disc 400. Initially, the head end of the filter bag 600 is connected to the interior of the housing 100. Each filter bag 600 has a supporting frame, allowing one side of the tail end to be suspended.

[0033] The movable disc 500 is coaxially arranged with the filter cartridge 200 and can move within the housing 100 along a first direction. The movable disc 500 is located on the side of the adjusting disc 400 away from the filter cartridge 200 in the first direction. In the initial state, the movable disc 500 is away from the adjusting disc 400 in the first direction and does not abut against the filter cartridge 200. However, as the movable disc 500 moves within the housing 100 towards the side closer to the adjusting disc 400, it can abut against the filter cartridge 200, defining a backwash chamber 700 between the movable disc 500, the adjusting disc 400, and the filter cartridge 200. At this time, the head end of the filter bag 600 is connected to the backwash chamber 700. A water supply mechanism is installed on the housing 100 for supplying water to the backwash chamber 700.

[0034] In this embodiment, a main filter and a secondary filter are installed on the housing 100. During use, water to be filtered from the fish pond is fed into the filter cartridge 200 through the inlet 201. The water flows from the inside to the outside of the filter cartridge 200 for filtration. The filtered water returns to the fish pond through the outlet on the housing 100. Impurities remaining after filtration adhere to the inner wall of the filter cartridge 200. Simultaneously, water entering the filter cartridge 200 also passes through multiple filter bags 600, flowing from the outside to the inside of the filter bags 600 for filtration. During this process, the moving disc 500 does not contact the filter cartridge 200, so the filtered water flows from the head of the filter bag 600 into the housing 100, and then returns to the fish pond through the outlet on the housing 100. Impurities remaining after filtration adhere to the outside of the filter bag 600. Although some impurities are carried away to the inner wall of the filter cartridge 200 by the water flow, most of the impurities remain attached to the outside of the filter bag 600. That is, by setting multiple filter bags 600 inside the filter cartridge 200, not only is excessive space not occupied, but the service life of the water circulation filtration device for the aquaculture of the blue rock loach is also extended, and the cleaning frequency of the filter cartridge 200 is reduced.

[0035] When it is necessary to clean the filter cartridge 200 and filter bag 600, firstly, drive the moving disc 500 to move in the first direction within the housing 100 towards the side closer to the adjusting disc 400, so that the moving disc 500 can abut against the filter cartridge 200. At this time, the head end of the filter bag 600 is connected to the backwash chamber 700. Then, start the cleaning mechanism 300 and the water supply mechanism. The cleaning mechanism 300 cleans the filter cartridge 200, and the water supply mechanism supplies water to the backwash chamber 700. The water will enter the filter bag 600 from the backwash chamber 700 and backwash the filter bag 600 to prevent it from clogging. The backwashing method improves the cleaning effect of the filter bag 600. The impurities after backwashing will adhere to the inner side of the filter cartridge 200 and be cleaned together by the cleaning mechanism 300. This saves time and effort while improving the stability of the living environment of the blue rock lizard.

[0036] Furthermore, the movement of the movable disc 500 distinguishes between the use and cleaning of the filter bag 600. During normal use, the movable disc 500 does not contact the filter cartridge 200, and the backwash chamber 700 is not formed. Water filtered by the filter bag 600 can flow directly from its tail end into the housing 100. When cleaning of the filter bag 600 is required, the movable disc 500 is moved to contact the filter cartridge 200, forming the backwash chamber 700. The filter bag 600 is then backwashed from the backwash chamber 700. The space between the movable disc 500 and the adjusting disc 400 achieves both filtration and cleaning of the filter bag 600, saving space and making it more convenient to use.

[0037] In this embodiment, the filter cartridge 200 is rotatable within the housing 100 in a first direction, and the adjusting disc 400 is rotatably engaged with the filter cartridge 200. The cleaning mechanism 300 includes a cleaning pipe 310, a receiving disc 320, and a drain pipe 330. The cleaning pipe 310 is fixedly installed inside the housing 100, and the cleaning pipe 310 is located on the side of the filter cartridge 200 away from the horizontal central axis of the filter cartridge 200 in the second direction. The second direction is perpendicular to the first direction and is the radial direction of the filter cartridge 200. Multiple nozzles 311 are evenly distributed on the cleaning pipe 310 along the first direction. All nozzles 311 are connected to the cleaning pipe 310 and are used to supply water to the multiple nozzles 311. The receiving plate 320 is arranged inside the filter cartridge 200 along the first direction, and the nozzles 311 are arranged facing the receiving plate 320. The height of the liquid level in the filter cartridge 200 in the third direction is always less than the height of the receiving plate 320 in the third direction. The third direction is a vertical direction, so the water in the filter cartridge 200 will not submerge the receiving plate 320. Multiple filter bags 600 are located below the receiving tray 320. A drain pipe 330 is fixedly mounted on the housing 100. The receiving tray 320 has an opening. One end of the drain pipe 330 is fixedly connected to the receiving tray 320 and communicates with the opening. The other end of the drain pipe 330 extends out of the housing 100 through the second end of the filter cartridge 200. The drain pipe 330 is rotatably engaged with the filter cartridge 200 and fixedly connected to the housing 100. The movable tray 500 is slidably engaged with the drain pipe 330.

[0038] Specifically, a partition plate 110 is fixedly installed inside the housing 100, which divides the housing 100 into a first chamber and a second chamber. The filter cartridge 200 is installed in the first chamber. A main water inlet 101 is provided on the housing 100. The main water inlet 101 is connected to the water inlet 201 on the filter cartridge 200 through a connecting pipe. The main water inlet 101 is connected to a first water pump, which is used to deliver water to the filter cartridge 200.

[0039] The cleaning mechanism 300 also includes a second water pump 120, which is installed on the second chamber. The cleaning pipe 310 is connected to the second water pump 120, and water is delivered to the cleaning pipe 310 through the second water pump 120, so that the water can be sprayed out from the cleaning pipe 310 after passing through the nozzle 311.

[0040] A motor 130 is fixedly mounted on the housing 100. The output shaft of the motor 130 extends into the housing 100 along a first direction. A gear 140 is fixedly connected to the output shaft of the motor 130. A gear ring 210 is coaxially and fixedly connected to the filter cartridge 200. The gear ring 210 is located at the second end of the filter cartridge 200 and meshes with the gear 140.

[0041] A first protrusion is provided on the outer peripheral wall of the sewage pipe 330, and a first annular groove is provided at the second end of the filter cartridge 200. The first protrusion and the first annular groove are rotatably engaged, thereby enabling the sewage pipe 330 and the filter cartridge 200 to rotatably engage.

[0042] The end of the drain pipe 330 extending out of the housing 100 is connected to a collection box 340, which is used to collect the discharged impurities.

[0043] In this embodiment, by setting up a cleaning pipe 310, a receiving tray 320, and a drain pipe 330, when the filter cartridge 200 needs cleaning, the motor 130 is started. The start of the motor 130 drives the gear 140 to rotate in a first direction. The rotation of the gear 140 drives the gear ring 210 to rotate, and the gear ring 210 drives the filter cartridge 200 to rotate in the first direction. At the same time, the second water pump 120 is started to send water to the cleaning pipe 310. After passing through the cleaning pipe 310, the water is sprayed onto the filter cartridge 200 through the nozzle 311, backwashing the impurities on the inner wall of the filter cartridge 200. The washed-off impurities fall onto the receiving tray 320. During the rotation of the filter cartridge 200 relative to the receiving tray 320 and the nozzle 311, the cleaning position of the filter cartridge 200 can be continuously changed to perform a comprehensive cleaning of the filter cartridge 200. After the impurities fall onto the receiving tray 320, they are discharged into the collection box 340 through the drain pipe 330 for convenient subsequent unified treatment.

[0044] In this embodiment, a hydraulic telescopic cylinder 150 is provided on the housing 100. The output end of the hydraulic telescopic cylinder 150 is fixedly connected to the movable disk 500. The hydraulic telescopic cylinder 150 is used to drive the movable disk 500 to move in a first direction. A backflush port 510 is provided on the movable disk 500. The backflush port 510 is connected to the backflush chamber 700. The water supply mechanism includes a third water pump 160. The backflush port 510 is connected to the third water pump 160 through a telescopic pipe, and water is supplied to the backflush chamber 700 through the third water pump 160.

[0045] Specifically, the movable disc 500 includes a main board and a cover plate, both coaxially arranged with the filter cartridge 200. The cover plate is annular, and the cover plate and main board are arranged sequentially in the first direction, with the cover plate located on the side of the main board closer to the adjusting disc 400 in the first direction. A sealing ring is provided on the end of the cover plate facing the adjusting disc 400 in the first direction. The output end of the hydraulic telescopic cylinder 150 is fixedly connected to the main board, so that when the main board moves in the first direction towards the side closer to the adjusting disc 400, the side of the cover plate with the sealing ring can abut against the filter cartridge 200, forming a backflushing cavity 700 between the adjusting disc 400, the main board, the cover plate, and the filter cartridge 200, and the backflushing cavity 700 is sealed. The backflushing port 510 is opened on the main board.

[0046] In this embodiment, the adjusting disc 400 includes an inner ring 410, an outer ring 420, and a sealing membrane 430. Both the inner ring 410 and the outer ring 420 are coaxially arranged with the filter cartridge 200 and rotatably engage with it. The inner ring 410 and the outer ring 420 are connected by connecting ribs. The sealing membrane 430 is a flexible structure and is fixed between the inner ring 410 and the outer ring 420. In its initial state, the sealing membrane 430 has wrinkles between the inner ring 410 and the outer ring 420, allowing for deformation. A float 431 is fixedly disposed on the sealing membrane 430. The float 431 is located inside the filter cartridge 200, and is positioned on the side of the plurality of filter bags 600 facing upwards towards the receiving disc 320.

[0047] Specifically, the filter cartridge 200 includes a main cylinder 202 and a support cylinder 203, which are coaxially arranged. A filter screen is mounted on the main cylinder 202, and a toothed ring 210 is fixedly connected to the main cylinder 202. An inlet 201 is located on the main cylinder 202. The support cylinder 203 and the movable disk 500 are located on the same side in a first direction. The support cylinder 203 is fixedly connected to the filter cartridge 200 via a connecting rod 204, and the inner ring 410 is rotatably engaged with the support cylinder 203, while the outer ring 420 is rotatably engaged with the main cylinder 202. A first annular groove is formed on the inner circumferential wall of the support cylinder 203.

[0048] More specifically, the support cylinder 203 has a second annular groove, and the outer peripheral wall of the inner ring 410 has a second protrusion that rotatably engages with the second annular groove. The main cylinder 202 has a third annular groove, and the inner peripheral wall of the outer ring 420 has a third protrusion that rotatably engages with the third annular groove.

[0049] In this embodiment, a float ball 431 is set on the adjusting plate 400. During use, the float ball 431 will move up and down according to the liquid level in the filter cylinder 200, and the sealing membrane 430 will deform accordingly. This ensures that multiple filter bags 600 are all underwater, preventing the filter bags 600 from being exposed above the water surface and thus preventing them from drying out and affecting their use.

[0050] In this embodiment, a plurality of connecting pieces 432 are fixedly disposed on the sealing membrane 430. These connecting pieces 432 are evenly distributed on the sealing membrane 430 along a first direction. Each connecting piece 432 is located on the side of the float 431 away from the inlet 201 in the first direction, and also on the side of the float 431 away from the receiving plate 320 in a third direction. Every two filter bags 600 are fixed to one connecting piece 432. The connecting pieces 432 are capable of sliding within the third annular groove.

[0051] In this embodiment, the uniformity of the filter bag 600 distribution in the water can be improved by setting multiple connecting pieces 432.

[0052] Furthermore, multiple connecting pieces 432 are connected by adjusting pieces 433. The adjusting pieces 433 are elastic and are arranged around the sealing membrane 430 in a first direction and slide in cooperation with the sealing membrane 430. Each end of the adjusting piece 433 in the first direction is provided with a follower piece 434. Two floats 431 are provided, each corresponding to one of the two follower pieces 434, and the floats 431 are fixedly connected to their corresponding follower pieces 434.

[0053] By setting the adjusting plate 433 to connect multiple connecting plates 432, when the float 431 moves up and down in the water and causes the sealing membrane 430 to deform, it will drive the corresponding follower plate 434 to move synchronously, and further cause the adjusting plate 433 to deform, thereby maintaining the uniformity of the distribution of multiple connecting plates 432 in the water as much as possible, that is, the uniformity of the distribution of filter bag 600 in the water.

[0054] Furthermore, multiple connecting pieces 432 are located at the lower part of the sealing membrane 430, with one connecting piece 432 in a vertical position. A sealing ball 450 is connected to this connecting piece 432 via a first elastic element 440. The first elastic element 440 is arranged along a first direction and is a compression spring. The first elastic element 440 always has a tendency to cause the sealing ball 450 to move away from the sealing membrane 430 along the first direction. Two pull ropes 460, which are elastic ropes, are fixedly connected to the sealing ball 450. The two pull ropes 460 are respectively fixed to the connecting piece 432 adjacent to it along the first direction. A backflush port 510 is coaxially arranged with the sealing ball 450 in the first direction. The backflush port 510 has a large end and a small end, which are arranged sequentially in the first direction, with the large end located on the side of the small end closer to the sealing ball 450 in the first direction.

[0055] A distance sensor is installed inside the filter cartridge 200. The distance sensor is used to detect the height of the liquid level in the vertical direction inside the filter cartridge 200. When the height of the liquid level in the vertical direction inside the filter cartridge 200 is greater than a preset value, the detected electrical signal is fed back to the controller of the external device. The controller is electrically connected to the motor 130, the hydraulic telescopic cylinder 150, the first water pump, the second water pump 120, and the third water pump 160, and can control the motor 130, the hydraulic telescopic cylinder 150, the first water pump, the second water pump 120, and the third water pump 160 to start or stop.

[0056] In use, the controller first drives the first water pump to start, supplying water into the filter cartridge 200. At this time, the distance sensor constantly monitors the height of the liquid level in the vertical direction in the filter cartridge 200. When the height of the liquid level in the vertical direction in the filter cartridge 200 is greater than the preset value, it indicates that the filter cartridge 200 is blocked and needs to be cleaned. The distance sensor will feed back the signal to the controller, at which time the controller stops the first water pump and starts the hydraulic telescopic cylinder 150, motor 130, second water pump 120 and third water pump 160 to start the cleaning process.

[0057] In this embodiment, by setting a blocking ball 450 on the vertically positioned connecting piece 432, when cleaning the filter cartridge 200 and filter bag 600, as the filter cartridge 200 gradually becomes unblocked, the height of the liquid level in the filter cartridge 200 in the first direction will continuously decrease. When the liquid level in the filter cartridge 200 changes, the height of the float ball 431 in the vertical direction will change accordingly. This will drive the connecting piece 432 through the follower piece 434, thereby causing the pull rope 460 to stretch or contract. When the liquid level is relatively high, the float ball 431 is also relatively high. At this time, the filter cartridge 200 is more blocked, and the multiple connecting pieces 432 are relatively far apart in the first direction. Therefore, the pulling force of the pull rope 460 on the blocking ball 450 is relatively large, and the effect of the first elastic member 440 on the blocking ball 450 is relatively smaller. That is, when the moving plate 500 abuts against the filter cartridge 200, the blocking ball 450 is closer to the large end of the backwash port 510 in the first direction, making it easier for water to flow through.

[0058] When the liquid level is relatively low, it indicates that the filter cartridge 200 is gradually becoming clear, the float 431 is also relatively low, and the multiple connecting pieces 432 are relatively close in position along the first direction. Therefore, the pulling force of the pull rope 460 on the sealing ball 450 is relatively small, and the first elastic element 440 has a relatively greater effect on the sealing ball 450. That is, when the moving disc 500 comes into contact with the filter cartridge 200, the sealing ball 450 is closer to the small end of the backflushing port 510 in the first direction. The opening degree of the backflushing port 510 is adjusted by the height of the liquid level inside the filter cartridge 200, which saves water and speeds up the cleaning process.

[0059] Based on the above embodiments, the specific working process is as follows:

[0060] In use, water to be filtered from the fishpond is fed into the filter cartridge 200 through the inlet 201. The water flows from the inside to the outside of the filter cartridge 200 for filtration. The filtered water returns to the fishpond through the outlet on the housing 100. Impurities remaining after filtration adhere to the inner wall of the filter cartridge 200. Simultaneously, water entering the filter cartridge 200 also passes through multiple filter bags 600, flowing from the outside to the inside of the filter bags for filtration. During this process, the moving disc 500 does not contact the filter cartridge 200, so the filtered water flows from the beginning of the filter bags 600 into the housing 100, and then returns to the fishpond through the outlet on the housing 100. Impurities remaining after filtration adhere to the outside of the filter bags 600. Although some impurities are carried to the inner wall of the filter cartridge 200 by the water flow, most impurities remain attached to the outside of the filter bags 600.

[0061] When it is necessary to clean the filter cartridge 200 and filter bag 600, the hydraulic telescopic cylinder 150 is activated so that the moving disc 500 can abut against the filter cartridge 200. At this time, the head end of the filter bag 600 is connected to the backwash chamber 700.

[0062] Then, the motor 130 is started. The motor 130 drives the gear 140 to rotate in the first direction. The rotation of the gear 140 drives the gear ring 210 to rotate, which in turn drives the filter cartridge 200 to rotate in the first direction. Simultaneously, the second water pump 120 is started to supply water to the cleaning pipe 310. After passing through the cleaning pipe 310, the water is sprayed onto the filter cartridge 200 through the nozzle 311, backwashing impurities on the inner wall of the filter cartridge 200. The washed-off impurities fall onto the receiving tray 320. During the rotation of the filter cartridge 200 relative to the receiving tray 320 and the nozzle 311, the cleaning position of the filter cartridge 200 can be continuously changed, allowing for a comprehensive cleaning of the filter cartridge 200. After the impurities fall onto the receiving tray 320, they are discharged into the collection box 340 through the drain pipe 330 for subsequent unified processing.

[0063] At the same time, the third water pump 160 is started to supply water into the backwash chamber 700. The water will enter the filter bag 600 from the backwash chamber 700 and backwash the filter bag 600 to prevent the filter bag 600 from clogging. The backwashing method improves the cleaning effect of the filter bag 600. The impurities after backwashing will adhere to the inner side of the filter cartridge 200 and be cleaned by the cleaning mechanism 300.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A water circulation and filtration device for raising bluestone catfish, characterized in that: The system includes a housing, a main filter element, and a secondary filter element. The main filter element includes a filter cartridge and a cleaning mechanism. The filter cartridge is arranged inside the housing along a first direction, which is horizontal. The cleaning mechanism is mounted on the housing and is used to clean the filter cartridge. The two ends of the filter cartridge along the first direction are referred to as the first end and the second end, respectively. The first end is sealed, and the second end is open in the first direction. The first end has a water inlet, and the housing has a water outlet. The secondary filter element includes an adjusting disc, a moving disc, a water supply mechanism, and multiple filter bags. The adjusting disc is located at the second end of the filter cartridge and is coaxial with the filter cartridge. The multiple filter bags are arranged inside the filter cartridge along the first direction, and the two ends of the filter bags along the first direction are referred to as the head end and the tail end, respectively. The filter bag has a first end that extends through the first direction, is fixed to the adjusting plate and extends out of the adjusting plate, and in the initial state, the first end of the filter bag is connected to the inside of the housing. The filter bag has a supporting frame, so that one side of the tail end is suspended. The movable plate is coaxially arranged with the filter cylinder and can move in the housing along the first direction. The movable plate is located on the side of the adjusting plate away from the filter cylinder in the first direction. In the initial state, the movable plate does not abut against the filter cylinder, and the movable plate moves in the housing along the first direction towards the side of the adjusting plate and abuts against the filter cylinder. A backwash chamber is defined between the movable plate, the adjusting plate and the filter cylinder, and at this time, the first end of the filter bag is connected to the backwash chamber. The water supply mechanism is installed on the housing and is used to supply water to the backwash chamber. The filter cartridge can rotate within the housing in a first direction, and the adjusting disc rotates in coordination with the filter cartridge. The cleaning mechanism includes a cleaning pipe and a receiving disc. The cleaning pipe is fixedly installed within the housing and is located on the side of the filter cartridge away from the horizontal central axis of the filter cartridge in a second direction. The second direction is perpendicular to the first direction and is the radial direction of the filter cartridge. Multiple nozzles are evenly distributed along the first direction on the cleaning pipe, and all nozzles are connected to the cleaning pipe. The cleaning pipe is used to supply water to the multiple nozzles. The receiving disc is installed within the filter cartridge along the first direction, and the nozzles face the receiving disc. The height of the liquid level in the filter cartridge in a third direction is always less than the height of the receiving disc in a third direction. The third direction is vertical, and multiple filter bags are located below the receiving disc. The regulating disc includes an inner ring, an outer ring, and a sealing membrane. Both the inner and outer rings are coaxially arranged with the filter cartridge and rotate with it. The inner and outer rings are connected by connecting ribs. The sealing membrane is a flexible structure and is fixed between the inner and outer rings. In the initial state, there are folds between the inner and outer rings of the sealing membrane. A float is fixedly installed on the sealing membrane. The float is located inside the filter cartridge and is located on the side of the multiple filter bags facing upwards towards the receiving disc. Multiple connecting pieces are fixedly installed on the sealing membrane. The multiple connecting pieces are evenly distributed on the sealing membrane around the first direction. The multiple connecting pieces are all located on the side of the float away from the water inlet in the first direction, and the multiple connecting pieces are all located on the side of the float away from the receiving plate in the third direction. Every two filter bags are fixed on one connecting piece.

2. The water circulation and filtration device for raising *Cyprinus purpurea* according to claim 1, characterized in that: The cleaning mechanism also includes a drain pipe, which is fixedly installed on the housing. A port is opened on the receiving plate. One end of the drain pipe is fixedly connected to the receiving plate and the drain pipe is connected to the port. The other end of the drain pipe extends out of the housing through the second end of the filter cartridge and is rotatably engaged with the filter cartridge and fixedly connected to the housing.

3. The water circulation and filtration device for raising *Cyprinus purpurea* according to claim 1, characterized in that: Multiple connecting pieces are connected by adjusting pieces. The adjusting pieces are elastic and are arranged around the sealing membrane in a first direction and slide in cooperation with the sealing membrane. Both ends of the adjusting pieces in the first direction are provided with follower pieces. There are two floats, and the two floats are arranged in a one-to-one correspondence with the two follower pieces. The floats are fixedly connected to their corresponding follower pieces.

4. The water circulation and filtration device for raising *Cyprinus purpurea* according to claim 3, characterized in that: A hydraulic telescopic cylinder is installed on the housing. The output end of the hydraulic telescopic cylinder is fixedly connected to the moving plate. The hydraulic telescopic cylinder is used to drive the moving plate to move in the first direction. A backflush port is opened on the moving plate. The backflush port is connected to the backflush chamber. The water supply mechanism includes a third water pump. The backflush port is connected to the third water pump through a telescopic pipe.

5. The water circulation and filtration device for raising *Cyprinus spp.* according to claim 4, characterized in that: Multiple connecting pieces are located at the lower part of the sealing membrane, and one of the connecting pieces is in a vertical state. A sealing ball is connected to the connecting piece through a first elastic element. The first elastic element is arranged along a first direction and always has the tendency to cause the sealing ball to move away from the sealing membrane along the first direction. Two pull ropes are fixed to the sealing ball. The pull ropes are elastic ropes and are respectively fixed to the connecting pieces arranged adjacent to each other along the first direction. The backflow port is coaxially arranged with the sealing ball in the first direction. The backflow port has a large end and a small end. The large end and the small end are arranged sequentially in the first direction, and the large end is located on the side of the small end closer to the sealing ball in the first direction.

6. The water circulation and filtration device for raising *Cyprinus purpurea* according to claim 2, characterized in that: A partition plate is fixedly installed inside the housing, dividing the housing into a first chamber and a second chamber. The filter cartridge is installed in the first chamber. A main water inlet is opened on the housing, which is connected to the water inlet on the filter cartridge through a connecting pipe. The main water inlet is connected to a first water pump. The cleaning mechanism also includes a second water pump, which is installed on the housing. The cleaning pipe is connected to the second water pump.

7. A water circulation and filtration device for raising *Cyprinus purpurea* according to claim 2, characterized in that: A collection box is connected to one end of the sewage pipe that extends out of the casing.

8. The water circulation and filtration device for raising *Cyprinus spp.* according to claim 1, characterized in that: A motor is fixedly mounted on the housing. The output shaft of the motor extends into the housing in a first direction. A gear is fixedly connected to the output shaft of the motor. A gear ring is coaxially and fixedly connected to the filter cartridge. The gear ring is located at the second end of the filter cartridge and meshes with the gear.

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