Fishpond water changing equipment capable of adjusting countercurrent bucket water

Abstract

The utility model relates to the technical field of fishpond water changing, in particular to fishpond water changing equipment capable of adjusting countercurrent hopper water, which comprises a filtering mechanism, a brushing mechanism is arranged in the filtering mechanism, and a purifying mechanism is arranged above the filtering mechanism. When water in the fishpond needs to be changed, a power source of the first water pump is switched on, the first water pump can pump water and improve the water supply pressure in the water changing process, then water with dirt is fed into the filter cartridge, the water is continuously fed into the filter cartridge, the water level rises, sewage passes through the filter holes in the inner container firstly, large impurities and attachments are filtered out, and then the water in the fishpond can be changed. Then, after the water enters the inner container, tiny impurities are filtered through micropores in the filter tip, so that the cleanliness of the water in the water changing and circulating process is improved, the water level rises all the time, the water overflows into the purification barrel through the drainage pipe, the sterilization and disinfection effects can be achieved through irradiation of the ultraviolet lamp, and the cleanliness of the circulating water is further improved.

Description

Technical Field

[0001] This utility model relates to the field of fish pond water exchange technology, and specifically discloses a fish pond water exchange device with adjustable counter-current water flow. Background Technology

[0002] An adjustable counter-current water exchange system for fish ponds is a device specifically designed for water circulation and replacement in fish ponds. This system uses a counter-current flow to create a circulating water flow within the pond, helping to maintain water quality, increase oxygen levels, and effectively remove waste and impurities.

[0003] For example, the utility model with authorization announcement number CN221449540U discloses a fish pond water changing device. Its technical solution includes a fish pond body, with two drain pipes fixedly connected to one side of the fish pond body. A water collection box is fixedly installed at one end of each drain pipe. An outlet pipe is fixedly connected to one side of the water collection box. A motor is installed at the front of the water collection box, and a drive shaft is fixedly connected to the motor output end. One end of the drive shaft extends into the inside of the water collection box. A drive rod is embedded at the front of the fish pond body. A first sprocket and a second sprocket are fixedly sleeved on the outer sides of the drive shaft and drive rod, respectively. A disc is fixedly connected to the front end of the drive rod, and a rotating rod is fixedly connected to the front of the disc. A movable tube is sleeved on the outer side of the rotating rod, and a movable rod is installed at the top of the connecting tube. A top plate is fixedly connected to the top of the movable rod. The beneficial effects of this utility model are: it improves the efficiency of fish pond water changing, and at the same time, it improves the cleanliness of the fish pond, preventing sewage from polluting the fish and preventing fish deaths, thus avoiding cost waste for the user. Currently, most fish ponds accumulate a lot of dirt and impurities at the bottom after prolonged use. Although a grating structure is installed at the drainage point at the bottom of the fish pond, a large amount of dirt and impurities are still discharged during water changes. If this drainage point is connected to a water exchange and circulation system, a large amount of dirt can easily enter the water exchange and circulation system and flow back into the fish pond with the circulating water, causing secondary pollution of the fish pond. This will cause the water to become turbid in a short time, reduce the oxygen content in the water, compress the living space of the fish, and endanger the life of the fish. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a fish pond water exchange device with adjustable counter-current water flow, so as to solve the problem of filtering dirt and impurities in the circulating water when the fish pond water is circulated in the form of counter-current water flow, thereby improving the cleanliness of the circulating water returning to the fish pond.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a fish pond water exchange device with adjustable counter-current water flow, including a filtration mechanism, a cleaning mechanism inside the filtration mechanism, and a purification mechanism above the filtration mechanism.

[0006] Furthermore, the filtration mechanism includes a filter cylinder with a bottom cover at its lower end. A handle is provided on the outer ring wall of the bottom cover. External threads and internal threads are respectively provided at the connection between the bottom cover and the filter cylinder. The external threads and internal threads are threaded together. A water inlet is provided through one end of the filter cylinder. A water pump is provided outside the filter cylinder. The outlet end of the water pump is connected to the end flange of the water inlet. A water pump pipe is installed on the inlet flange of the water pump.

[0007] Furthermore, the filter cylinder has several support blocks inside, an inner liner inside, an edge protrusion at the end of the inner liner, filter holes penetrating the interior of the inner liner on the surface of the inner liner, and a mounting plate at the upper end of the edge protrusion. The mounting plate is fixedly assembled to the inner wall of the filter cylinder by a threaded knob.

[0008] Furthermore, a drain pipe is provided through the center of the top cover, and a filter nozzle is provided at the lower end of the drain pipe. Several micro-holes penetrating the interior are opened on the surface of the filter nozzle. Valves one and two are respectively provided on the surface of the drain pipe. A water supply interface is provided between valves one and two. A valve three is provided on the surface of the water supply interface.

[0009] Furthermore, the cleaning mechanism includes a bearing, a shaft is provided through the bearing, a linkage sleeve is provided on the surface of the shaft, connecting rods are distributed on the outer ring wall of the linkage sleeve, and a scraper is provided at the vertical position of the connecting rod.

[0010] Furthermore, a linkage bevel gear is provided on the surface of the shaft, a bearing 2 is provided through the surface of the filter cylinder, a drive shaft is provided through the interior of the bearing 2, the surface of the drive shaft is interference-fitted with the inner ring wall of the bearing 2, a drive bevel gear is provided at one end of the drive shaft inside the filter cylinder, and a motor is provided at the outward end of the drive shaft.

[0011] Furthermore, the purification mechanism includes a purification cylinder with a transition interface extending through its lower end, and an ultraviolet lamp installed inside the purification cylinder.

[0012] Furthermore, a water outlet is provided through one end of the purification cylinder, a connecting frame is provided at the upper end of the cover, a second water pump is provided above the connecting frame, and a return port is connected to the outlet flange of the second water pump.

[0013] The working principle and beneficial effects of this solution are as follows: 1. When the water in the fish pond needs to be changed, the water is connected to the drain interface flange at the bottom of the fish pond through the water pump pipe, so that the water in the fish pond can be sent into the water pump pipe from the bottom. The power of the water pump is turned on, and the water pump can pump water to increase the water supply pressure during the water change process. Then, the water with dirt is sent into the filter cartridge. As the water is continuously sent into the filter cartridge, the water level rises. The sewage will first pass through the filter holes on the inner tank to filter out large impurities and attached substances. Then, after entering the inner tank, it will pass through the micropores on the filter nozzle to filter out fine impurities, thereby improving the cleanliness of the water during the water change circulation process. The water level continues to rise and overflows into the purification cartridge through the drain pipe. When irradiated by ultraviolet lamp, it can achieve a sterilization and disinfection effect, further improving the cleanliness of the circulating water.

[0014] 2. As described in 1, after the water level rises continuously during purification and filtration, the power supply to water pump two is turned on. Water pump two can then pump water out through the outlet port and send it to the next stage of treatment equipment or directly back into the fish pond through the return port. After a water change process is completed, when it is necessary to backwash the filter nozzles and filter holes in the filter cylinder, valve two is closed and valve one is opened. Clean water is injected into the drain pipe through the water supply port, which can flush out the blocked micropores and filter holes in the filter cylinder. Then, the bottom cover can be opened for waste discharge. When it is necessary to add water to the pool, valve one is closed and valve two is opened to send clean water upwards to achieve the water replenishment work of the pool.

[0015] 3. As described in section 2, when cleaning and preventing clogging of the outward-facing part of the filter holes during the circulating filtration process, the shaft is first driven by connecting the motor power supply, allowing the motor to rotate the shaft, which in turn drives the drive shaft to rotate. This causes the drive shaft to rotate the drive bevel gear, which, through meshing, rotates the linkage bevel gear, ultimately causing the shaft to rotate. As the shaft rotates, it can be stably positioned based on the bearing, simultaneously driving the linkage sleeve to rotate. The linkage sleeve then drives the scraper on the connecting rod to rotate, cleaning the outer wall of the inner tank. This effectively removes dirt adhering to the outward-facing part of the filter holes during the inner tank filtration process, ensuring a stable and smooth filtration process.

[0016] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0017] Figure 1This is a schematic diagram showing the distribution of the various mechanisms in the embodiment;

[0018] Figure 2 This is a schematic diagram of the overall front structure of the embodiment;

[0019] Figure 3 This is a schematic diagram of the front internal structure of an embodiment;

[0020] Figure 4 This is a schematic diagram of the internal structure of the filter cartridge in an embodiment;

[0021] Figure 5 This is a partial top view of the drain pipe, filter nozzle, and inner liner in an embodiment.

[0022] Figure 6 This is a schematic diagram showing the location and connection of the external and internal threads in an embodiment.

[0023] The attached diagram is labeled as follows: 1. Filtering mechanism; 2. Cleaning mechanism; 3. Purification mechanism; 10. Filter cylinder; 11. Bottom cover; 12. Handle; 13. Top cover; 14. Water inlet; 15. Water pump one; 16. Pump pipe; 17. Support block; 18. Inner tank; 19. Edge protrusion; 110. Filter hole; 111. Mounting plate; 112. Threaded knob; 113. External thread; 114. Internal thread; 1001. Drain pipe; 1002. Valve one; 10 03. Valve II; 1004. Water supply interface; 1005. Valve III; 1006. Filter nozzle; 20. Bearing I; 21. Shaft; 22. Linkage sleeve; 23. Connecting rod; 24. Scraper; 25. Linkage bevel gear; 26. Bearing II; 27. Drive shaft; 28. Drive bevel gear; 29. ​​Motor; 30. Purification cylinder; 31. Ultraviolet lamp; 32. Transition interface; 33. Water outlet interface; 34. Connecting bracket; 35. Water pump II; 36. Return interface. Detailed Implementation

[0024] The following detailed description illustrates the specific implementation method:

[0025] Example

[0026] like Figures 1 to 6 As shown, a fish pond water exchange device with adjustable counter-current water is disclosed, including a filter mechanism 1, a cleaning mechanism 2 is provided inside the filter mechanism 1, and a purification mechanism 3 is provided above the filter mechanism 1.

[0027] The filter mechanism 1 includes a filter cylinder 10. A bottom cover 11 is provided at the lower end of the filter cylinder 10. A handle 12 is provided on the outer ring wall of the bottom cover 11, with one end of the handle 12 welded to the surface of the bottom cover 11. There are at least two handles 12, evenly distributed on the outer ring wall of the bottom cover 11. External threads 113 and internal threads 114 are respectively provided at the connection between the bottom cover 11 and the filter cylinder 10. External threads 113 are located on the outer ring wall of the bottom cover 11, and internal threads 114 are located on the inner ring wall of the filter cylinder 10. The external threads 113 and internal threads 114 are threaded together. The installation of external threads 113 and internal threads 114 facilitates easy assembly and disassembly of the bottom cover 11 and the filter cylinder 10, and ensures a stable seal. After periodic filtration, the bottom cover 11 can be removed to facilitate cleaning and impurity removal from the inside of the filter cylinder 10. The upper end of the filter cylinder 10 is covered with a cover 13. The lower end of the cover 13 is fixed to the filter cylinder 10 by screws. One end of the filter cylinder 10 is provided with a water inlet 14. The water inlet 14 is fixed to the filter cylinder 10 by welding. A water pump 15 is provided on the outside of the filter cylinder 10. The outer wall of the water pump 15 is fixed to the surface of the filter cylinder 10 by a bracket. The water outlet of the water pump 15 is connected to the end flange of the water inlet 14. A water pump pipe 16 is installed on the water inlet flange of the water pump 15. The water pump pipe 16 is connected to the bottom drainage flange of a conventional fish pond. If the bottom drainage position of the fish pond is not provided with a grid structure, a grid structure made of stainless steel wire mesh is provided on the water pump pipe 16 to block impurities that can clog the water pump 15. This method is a conventional technical content and will not be described in detail in the attached drawings.

[0028] The filter cylinder 10 has several support blocks 17 arranged equidistantly in a ring along the inner wall of the filter cylinder 10. One end of each support block 17 is fixed to the inner wall of the filter cylinder 10 by screws. The filter cylinder 10 also has an inner liner 18, with an edge protrusion 19 at one end. The edge protrusion 19 has a ring structure, and its outer ring wall is slidably fitted against the inner wall of the filter cylinder 10. The surface of the inner liner 18 has filter holes 110 penetrating its interior. When wastewater enters the filter cylinder 10, it can be filtered through the filter holes 110. For filtering large impurities and dirt, an installation plate 111 is provided at the upper end of the edge protrusion 19. There are two installation plates 111, which are symmetrically distributed at both ends of the edge protrusion 19. The installation plates 111 are fixedly assembled with the inner wall of the filter cylinder 10 by threaded knobs 112. The installation plates 111 have threaded holes, and the inner wall of the filter cylinder 10 has threaded grooves. The threaded knobs 112 are threadedly connected to the threaded holes and threaded grooves respectively. By installing the threaded knobs 112, the inner liner 18 can be kept in a stable position during filtration. When replacing or disassembling, it can be operated manually directly, which is simple and convenient.

[0029] A drain pipe 1001 is installed through the center of the top cover 13. The drain pipe 1001 is fixed to the top cover 13 by welding. The lower end of the drain pipe 1001 extends into the inner liner 18. A filter nozzle 1006 is also installed at the lower end of the drain pipe 1001. The upper end of the filter nozzle 1006 is welded to the lower end of the drain pipe 1001. Several micropores are opened on the surface of the filter nozzle 1006, which can facilitate the filtration of fine impurities and sludge, further improving the cleanliness of the water during the filtration process. The upper end of the drain pipe 1001 extends upward through the top cover 13. A valve 1002 and a valve 2 1003 are respectively installed on the surface of the drain pipe 1001. The valve cores of valve 1002 and valve 2 1003 are embedded inside the drain pipe 1001. A water supply interface 1004 is provided between the filter cartridge 10 and the drain pipe 1001. One end of the water supply interface 1004 passes through the interior of the drain pipe 1001, and the connection between the water supply interface 1004 and the drain pipe 1001 is fixed by welding. A valve 3 1005 is provided on the surface of the water supply interface 1004. The valve core of the valve 3 1005 is embedded inside the water supply interface 1004. When it is necessary to backwash the filter nozzle 1006 and filter hole 110 in the filter cartridge 10, the valve 2 1003 is closed and the valve 1 1002 is opened. Clean water is injected into the drain pipe 1001 through the water supply interface 1004, so that the blocked micropores and filter holes 110 in the filter cartridge 10 can be flushed open. Then, the bottom cover 11 can be opened to perform waste discharge operation. When it is necessary to replenish water to the water tank, the valve 1 1002 is closed and the valve 2 1003 is opened to deliver clean water upward to realize the water replenishment work of the water tank.

[0030] The cleaning mechanism 2 includes a bearing 20, which is disposed inside the filter cylinder 10. The outer ring wall of the bearing 20 is fixedly assembled to the inner wall of the filter cylinder 10 by a bracket. A shaft 21 is inserted through the bearing 20, and the surface of the shaft 21 is interference-fitted with the inner ring wall of the bearing 20. A linkage sleeve 22 is provided on the surface of the shaft 21, and the connection between the linkage sleeve 22 and the shaft 21 is fixed by screws. Connecting rods 23 are distributed on the outer ring wall of the linkage sleeve 22. There are at least four connecting rods 23, which are evenly distributed on the surface of the linkage sleeve 22. One end of each connecting rod 23 is connected to the outer ring wall of the linkage sleeve 22. The wall is welded and fixed. A scraper 24 is set in the vertical position of the connecting rod 23. One end of the scraper 24 is fixed to the connecting rod 23 by screws. The other end of the scraper 24 slides and fits tightly against the outer ring wall of the inner liner 18. The shaft 21 rotates, and the shaft 21 can be stably positioned and rotated based on the bearing 20. At the same time, it drives the linkage sleeve 22 to move together, and the linkage sleeve 22 can drive the scraper 24 on the connecting rod 23 to rotate and scrape the outer ring wall of the inner liner 18. This can clean the dirt adhering to the outer part of the filter hole 110 in the filtration stage of the inner liner 18, and ensure the stability and smoothness of the filtration process.

[0031] A linkage bevel gear 25 is provided on the surface of the shaft 21. The linkage bevel gear 25 is fixed to the shaft 21 by screws. A bearing 26 is provided through the surface of the filter cylinder 10. The bearing 26 is fixed to the filter cylinder 10 by welding. A drive shaft 27 is provided through the interior of the bearing 26. The surface of the drive shaft 27 is interference-fitted with the inner ring wall of the bearing 26. A drive bevel gear 28 is provided at one end of the drive shaft 27 inside the filter cylinder 10. The drive bevel gear 28 meshes with the linkage bevel gear 25. The drive shaft 27 faces outwards. A motor 29 is provided at one end. The outer wall of the motor 29 is fixedly mounted to the surface of the filter cartridge 10 through a bracket. The motor 29 has a drive shaft inside. The end of the drive shaft is fixedly connected to the end of the drive shaft 27 through a coupling. When the shaft 21 needs to be driven, the power supply of the motor 29 is turned on, so that the motor 29 can make the shaft rotate, and the shaft can drive the drive shaft 27 to rotate. Thus, the drive shaft 27 can make the drive bevel gear 28 rotate. Through the meshing effect, the linkage bevel gear 25 can be rotated, and finally the shaft 21 can be rotated.

[0032] The purification mechanism 3 includes a purification cylinder 30. A transition interface 32 is provided through the lower end of the purification cylinder 30. The connection between the transition interface 32 and the purification cylinder 30 is fixed by welding. An ultraviolet lamp 31 is installed inside the purification cylinder 30. The wiring terminal of the ultraviolet lamp 31 extends outward through the upper end of the purification cylinder 30. The connection between the purification cylinder 30 and the ultraviolet lamp 31 is sealed by resin adhesive. The ultraviolet lamp 31 is covered with a quartz glass cover, which can waterproof the ultraviolet lamp 31 while ensuring the normal passage of ultraviolet light. The ultraviolet lamp 31 can treat viruses and bacteria in the water when water flows through it, thereby improving the cleanliness of the water.

[0033] A water outlet 33 is provided through one end of the purification cylinder 30. The connection between the water outlet 33 and the purification cylinder 30 is fixed by welding. A connecting frame 34 is provided at the upper end of the top cover 13. The lower end of the connecting frame 34 is fixedly assembled to the surface of the top cover 13 by screws. A second water pump 35 is provided above the connecting frame 34. The lower end of the second water pump 35 is fixedly assembled to the upper end of the connecting frame 34 by a bracket. The water inlet end of the second water pump 35 and the water outlet 33 are connected by flanges. The water outlet end of the second water pump 35 is connected to a return port 36 by flanges. When the first water pump 15 continuously pumps water for filtration, the water flow first enters the filter cylinder 10, and then passes through the filter holes 110 of the inner liner 18 and the micropores of the filter nozzle 1006. The water is filtered and overflows upwards through drain pipe 1001 into purification tank 30, where it is sterilized by ultraviolet lamp 31. Then, as the water level rises, water can be pumped back through water pump 35 to stabilize the entire counter-current water exchange process. At the other end of the return port 36, during the return of circulating water, an ozone generator or activated carbon filter can be connected through a pipe. Since these two are conventional methods in the water exchange process of counter-current water exchange, they will not be discussed in detail in this solution. The main purpose is to further increase the oxygen content and filter odors. This solution mainly targets the filtration of dirt, the reduction of turbidity of the return water, and the elimination of bacteria and viruses in the water.

[0034] In practice

[0035] When the water in the fish pond needs to be changed, the water in the fish pond is connected to the drain port flange at the bottom of the fish pond through the water pump 16, so that the water in the fish pond can be sent into the water pump 16 from the bottom. The power of the water pump 15 is turned on, and the water pump 15 can pump water to increase the water supply pressure during the water change process. Then, the water with dirt is sent into the filter cartridge 10. As the water is continuously sent into the filter cartridge 10, the water level rises. The sewage will first pass through the filter holes 110 on the inner tank 18 to filter out large impurities and attached substances. Then, after entering the inner tank 18, it will pass through the micropores on the filter nozzle 1006 to filter out fine impurities, thereby improving the cleanliness of the water during the water change circulation process. The water level continues to rise and overflows into the purification cartridge 30 through the drain pipe 1001. When irradiated by the ultraviolet lamp 31, it can play a sterilization and disinfection effect, further improving the cleanliness of the circulating water.

[0036] After the water level rises continuously during purification and filtration, the power supply to water pump 2 35 is turned on. Water pump 2 35 can pump water out through water outlet 33 and send it to the next stage of treatment equipment or directly back into the fish pond through return interface 36. After a water change process is completed, when it is necessary to backwash the filter nozzles 1006 and filter holes 110 in the filter cylinder 10, close valve 2 1003 and open valve 1 1002. Inject clean water into the drain pipe 1001 through water supply interface 1004 so that the blocked micropores and filter holes 110 in the filter cylinder 10 can be flushed open. Then, open the bottom cover 11 to perform waste discharge. When it is necessary to add water to the pool, close valve 1 1002 and open valve 2 1003 to deliver clean water upwards to achieve the water replenishment work of the pool.

[0037] The external thread 113 and the internal thread 114 are connected to each other. The installation of the external thread 113 and the internal thread 114 facilitates the easy disassembly and assembly of the bottom cover 11 and the filter cylinder 10, as well as the stable sealing. After periodic filtration, the bottom cover 11 can be removed to facilitate the cleaning and impurity removal of the inside of the filter cylinder 10.

[0038] When cleaning and preventing clogging of the outward-facing portion of the filter holes 110 during the circulating filtration process, the shaft 21 is first driven to connect the power supply to the motor 29, allowing the motor 29 to rotate the shaft, which in turn drives the drive shaft 27 to rotate. This drives the drive bevel gear 28 to rotate, which in turn drives the linkage bevel gear 25 to rotate, ultimately causing the shaft 21 to rotate. As the shaft 21 rotates, it can be stably positioned and rotated based on the bearing 20. At the same time, this drives the linkage sleeve 22 to rotate, which in turn drives the scraper 24 on the connecting rod 23 to rotate and scrape the outer wall of the inner liner 18. This cleans the dirt adhering to the outward-facing portion of the filter holes 110 during the filtration process in the inner liner 18, ensuring a stable and smooth filtration process.

[0039] The above description is merely an embodiment of this utility model, and common knowledge such as specific structures and characteristics in the solution is not described in detail here. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these should also be considered within the protection scope of this utility model. These modifications and improvements will not affect the effectiveness of the implementation of this utility model or its practicality.

Claims

1. A fishpond water exchange device with adjustable counter-current water flow, characterized in that: It includes a filtration mechanism, the interior of which is equipped with a cleaning mechanism, and a purification mechanism is located above the filtration mechanism.

2. The fishpond water exchange device with adjustable counter-current water flow according to claim 1, characterized in that: The filtration mechanism includes a filter cylinder with a bottom cover at the lower end. A handle is provided on the outer ring wall of the bottom cover. The connection between the bottom cover and the filter cylinder is provided with external threads and internal threads, which are threaded together. A water inlet is provided through one end of the filter cylinder. A water pump is provided outside the filter cylinder. The outlet end of the water pump is connected to the end flange of the water inlet. A water pump pipe is installed on the inlet flange of the water pump.

3. The fishpond water exchange device with adjustable counter-current water flow according to claim 2, characterized in that: The filter cylinder has several support blocks inside and an inner liner inside. The end of the inner liner has an edge protrusion, and the surface of the inner liner has filter holes that penetrate through it. The upper end of the edge protrusion is provided with a mounting plate, which is fixedly assembled to the inner wall of the filter cylinder by a threaded knob.

4. The fishpond water exchange device with adjustable counter-current water flow according to claim 3, characterized in that: A drain pipe is installed through the center of the top cover. A filter nozzle is installed at the lower end of the drain pipe. Several micro-holes are opened on the surface of the filter nozzle. Valves one and two are installed on the surface of the drain pipe. A water supply interface is installed between valves one and two. A valve three is installed on the surface of the water supply interface.

5. The fishpond water exchange device with adjustable counter-current water flow according to claim 4, characterized in that: The cleaning mechanism includes a bearing, a shaft is installed through the bearing, a linkage sleeve is installed on the surface of the shaft, connecting rods are distributed on the outer ring wall of the linkage sleeve, and a scraper is installed at the vertical position of the connecting rod.

6. The fishpond water exchange device with adjustable counter-current water flow according to claim 5, characterized in that: The surface of the shaft is provided with a linkage bevel gear, the surface of the filter cylinder is provided with a bearing two through, the inside of the bearing two is provided with a drive shaft, the surface of the drive shaft is provided with an interference fit with the inner ring wall of the bearing two, the end of the drive shaft located inside the filter cylinder is provided with a drive bevel gear, and the outward end of the drive shaft is provided with a motor.

7. The fishpond water exchange device with adjustable counter-current water flow according to claim 6, characterized in that: The purification mechanism includes a purification cylinder with a transition interface extending through its lower end, and an ultraviolet lamp installed inside the purification cylinder.

8. The fishpond water exchange device with adjustable counter-current water flow according to claim 7, characterized in that: One end of the purification cylinder is provided with a water outlet, the upper end of the cover is provided with a connecting frame, and a second water pump is provided above the connecting frame. The outlet flange of the second water pump is connected to a return port.

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