A fish tank external filter barrel

Abstract

The present invention relates to an external filter barrel for a fish tank, comprising a barrel body, a barrel cover, a fish feces separator, a water barrier, a purification mechanism, a filter chamber and a water pump. The barrel body is provided with a receiving chamber, the barrel cover is movably mounted on the barrel body, and is provided with a water inlet pipe and a water outlet pipe. The fish feces separator is located in the barrel body, and its water inlet end is connected to the water inlet pipe. The water barrier is fixed to the bottom of the receiving chamber, and an inner ring is provided inside. A first channel and a second channel are formed between the inner ring and the water barrier, the former is connected to the water outlet end of the fish feces separator, and the latter is connected to the receiving chamber. The purification mechanism is composed of a purification barrel and a purification component inside thereof, which is inserted into the receiving chamber through a guide channel, and a water diversion gap is left between the purification barrel and the guide channel. A water diversion hole is provided on the upper part of the purification barrel, and a water outlet hole is provided on the lower part, which are respectively connected to the first channel and the second channel. The water pump is placed on the barrel cover, and its inlet is connected to the receiving chamber, and its outlet is connected to the water outlet pipe. The present invention aims to improve the filtering efficiency and keep the water clean.

Description

Technical Field

[0001] The invention relates to a filter barrel, in particular to an external filter barrel for a fish tank. Background Art

[0002] In recent years, with the improvement of people's quality of life, ornamental fish farming has gradually become a popular leisure activity. In order to ensure the healthy growth of ornamental fish, water quality management has become particularly important. As a key device for water purification, the performance of aquarium filters directly affects the stability of the aquarium environment and the quality of life of ornamental fish. At present, the common filters on the market mainly include built-in and external types. Since the built-in filter is directly installed inside the aquarium, although it is easy to install, it occupies a large space and affects the ornamental effect. More importantly, due to its limited volume and limited capacity of the filter material, it cannot meet the high requirements for water quality in large aquariums or multi-species mixed farming.

[0003] As an effective alternative, external filter barrels effectively solve the space occupation problem of built-in filters by placing the filter device outside the aquarium, and also provide the possibility of improving filtration efficiency. External filter barrels usually have a larger volume and can accommodate more filter materials, thereby achieving more thorough physical filtration, chemical adsorption and biodegradation, providing the aquarium with a continuous and stable source of clean water.

[0004] Although the existing external filter barrel products have solved the space occupation problem of the built-in filter to a certain extent and provided better filtering effects, they still face many challenges and limitations, which restrict their wider promotion and application.

[0005] On the one hand, the design of many external filter barrels lacks scientific and reasonable water flow path planning. Specifically, after the water flows into the filter barrel, due to the lack of an effective guiding mechanism, the water flow distribution is extremely uneven. In some areas, the water flow speed is too fast, and the water quality fails to fully contact the filter material, thereby reducing the effect of physical filtration. In other areas, the water flow speed is too slow or even stagnant, which not only wastes the effective area of ​​the filter material, but also easily forms dead corners, which become a breeding ground for bacteria. In the long run, it will not only affect the efficiency of the entire filtration system, but also may have a negative impact on the ecological environment in the aquarium.

[0006] On the other hand, the structural design of some external filter barrels is too complicated, which brings great inconvenience to users' daily maintenance. The complex structure not only increases the difficulty of initial installation, forcing many users to seek help from professionals, but also makes the subsequent cleaning and replacement of filter materials extremely cumbersome. For example, when it is necessary to regularly clean the inside of the filter barrel or replace the filter material, users often need to spend a lot of time and energy to disassemble it, and sometimes even need to completely drain the water in the filter barrel, which undoubtedly increases the maintenance cost. In addition, the complex structure may also be one of the reasons for frequent failures. Once a failure occurs, it is also difficult to repair.

[0007] This solution is based on an in-depth analysis of these issues and proposes targeted improvement measures, aiming to provide users with a more efficient, convenient and economical external filtering solution. Summary of the invention

[0008] The purpose of the present invention is to provide an external filter barrel for a fish tank, which can achieve high-efficiency filtration, is easy to maintain and has low cost.

[0009] To achieve the above object, the present invention provides the following technical solution: an external filter barrel for a fish tank, comprising a barrel body and a barrel cover, wherein the barrel body has a receiving cavity, the barrel cover is movably arranged on the barrel body to cover the receiving cavity, and the barrel cover is also provided with a water inlet pipe and a water outlet pipe, and further comprising,

[0010] A fish excrement separator is arranged in the barrel, the fish excrement separator has a water inlet end and a water outlet end, and the water inlet end of the fish excrement separator is connected to the water inlet pipe;

[0011] A water-blocking cover is fixed to the bottom of the accommodating chamber, an inner ring is coaxially arranged in the water-blocking cover, and a first channel and a second channel independent of each other are arranged between the inner ring and the water-blocking cover, the first channel is connected to the water outlet end of the fish feces separator, and the second channel is connected to the accommodating chamber;

[0012] The purification mechanism comprises a purification cylinder and a purification component arranged in the purification cylinder, wherein a guide channel is arranged in the accommodating chamber, the purification cylinder is inserted into the guide channel, and a water guide gap connected to the first channel is formed between the outer wall of the purification cylinder and the inner wall of the guide channel, a water guide hole connected to the water guide gap is arranged on the side wall of the upper part of the purification cylinder, and a water outlet hole connected to the second channel is arranged at the lower part of the purification cylinder;

[0013] A plurality of filter bins are provided, and are stacked up and down in the accommodating cavity;

[0014] A water pump is arranged on the barrel cover, an inlet of the water pump is connected to the accommodating cavity, and an outlet of the water pump is connected to the water outlet pipe.

[0015] Preferably, the filter bin includes a surrounding plate, a filter grille and a guide tube, the filter grille is fixed at the lower end of the surrounding plate, and a plurality of through grooves are provided on the filter grille, a placement cavity is formed between the surrounding plate and the filter grille, a filter assembly is placed in the placement cavity, and the guide tube is arranged to pass through from top to bottom. When a plurality of the filter bins are stacked up and down, the guide tube of the upper filter bin is inserted into the guide tube of the lower filter bin to form the guide channel.

[0016] Preferably, the upper end of the guide cylinder is higher than the upper end of the enclosure plate, and the outer wall of the guide cylinder is vertically provided with a limiting rib, and the inner wall of the bottom of the guide cylinder has a limiting groove matching the limiting rib, and when multiple filter bins are stacked up and down, the limiting rib of the lower filter bin is inserted into the limiting groove of the upper filter bin.

[0017] Preferably, the purification component includes a central tube and filter cotton, a positioning column is provided at the bottom of the purification cylinder, a positioning hole is provided on the positioning column which passes through from top to bottom, the lower end of the central tube is inserted into the positioning hole, and a plurality of water filtering holes are provided on the side wall of the central tube, the filter cotton is sleeved on the central tube, and the lower end of the positioning column extends out of the purification cylinder and is located in the inner circle, so that the positioning hole is connected to the second channel.

[0018] Preferably, the purification component comprises a UV germicidal lamp, and the UV germicidal lamp is fixed in the purification cylinder.

[0019] Preferably, a retaining ring is provided at the lower end of the purification cylinder, and the inner wall of the retaining ring is in close contact with the outer wall of the inner ring.

[0020] Preferably, a switching seat is provided between the first channel and the water outlet end of the fish feces separator, the switching seat has a first passage and a second passage which are independent of each other, a switching valve is provided on the switching seat, and the switching valve can be switched between a first position and a second position. When in the first position, the switching valve connects the first passage with the water outlet end of the fish feces separator, and when in the second position, the switching valve connects the second passage with an external sewage pipe.

[0021] Preferably, a sewage pipe connected to the accommodating chamber is arranged on the side wall of the barrel body, a regulating valve is installed on the sewage pipe, and the sewage pipe is connected to the sewage pipe.

[0022] Compared with the prior art, the advantages of the present invention are that the external filter barrel of the fish tank realizes an efficient and intelligent water purification process through a multiple filtering system. The water body first enters the fish feces separator through the water inlet pipe, and uses its separation structure to preliminarily separate large particles of impurities such as fish feces, ensuring that the efficiency of subsequent filtering links will not be reduced due to impurity blockage. The separated water body is introduced into the purification mechanism through the first channel of the water-proof cover. In this process, the water intake gap and water intake hole of the purification barrel guide the water flow from bottom to top into the purification barrel, and deeply purifies through the internal purification components to remove tiny particles, harmful substances and residual chlorine, etc., significantly improving the water quality. At the same time, the second channel guides the water purified by the purification barrel to the accommodating chamber, providing a stable water circulation path for the entire system. The multi-layered filter chamber further enhances the filtering effect, and multiple filtrations are performed on the water body through different medium layers, such as mechanical filtration, biological filtration and chemical filtration, to purify the water quality in all directions. Finally, the water pump transports the treated clean water back to the fish tank through the outlet pipe, forming an efficient closed water circulation system. This design not only greatly improves the water purification efficiency, but also significantly reduces the difficulty of maintenance, providing a healthier and more stable living environment for fish. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0025] Figure 2 is a cross-sectional view of the present invention;

[0026] Figure 3 It is a schematic diagram of the three-dimensional structure of the barrel body in the present invention;

[0027] Figure 4 It is a schematic diagram of the three-dimensional structure of the fish excrement separator of the present invention;

[0028] Figure 5 It is a schematic diagram of the three-dimensional structure of the purification mechanism in the present invention;

[0029] Figure 6 is a cross-sectional view of the purification mechanism in the second embodiment of the present invention;

[0030] Figure 7 is a cross-sectional view of the purification mechanism in the third embodiment of the present invention;

[0031] Figure 8 It is a schematic diagram of the three-dimensional structure of the filter bin in the present invention;

[0032] Fig. 9 It is a schematic diagram of the three-dimensional structure when the switching seat and the switching valve in the present invention cooperate;

[0033] In the figure, 1, barrel body; 2, barrel cover; 3, accommodating chamber; 4, water inlet pipe; 5, water outlet pipe; 6, fish feces separator; 7, water inlet end; 8, water outlet end; 9, water shield; 10, inner ring; 11, first channel; 12, second channel; 13, purification mechanism; 14, purification cylinder; 15, purification component; 16, guide channel; 17, water inlet gap; 18, water inlet hole; 19, water outlet hole; 20, filter chamber; 21, Water pump; 22. enclosure; 23. filter grille; 24. through groove; 25. placement cavity; 26. filter assembly; 27. guide cylinder; 28. limiting rib; 29. ​​limiting groove; 30. center tube; 31. filter cotton; 32. positioning column; 33. positioning hole; 34. water filter hole; 35. UV sterilizer lamp; 36. retaining ring; 37. switching seat; 38. switching valve; 39. sewage pipe; 40. regulating valve; 41. sewage pipe. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] Embodiment 1: As shown in the figure, an external filter barrel for fish tank includes a barrel body 1 and a barrel cover 2. The barrel body 1 has a receiving chamber 3. The barrel cover 2 is movably arranged on the barrel body 1 to cover the receiving chamber 3. The barrel cover 2 is also provided with a water inlet pipe 4 and a water outlet pipe 5. It also includes:

[0036] The fish excrement separator 6 is arranged in the barrel body 1, and has a water inlet end 7 and a water outlet end 8, and the water inlet end 7 of the fish excrement separator 6 is connected to the water inlet pipe 4;

[0037] The water-blocking cover 9 is fixed at the bottom of the accommodating chamber 3. An inner ring 10 is coaxially arranged in the water-blocking cover 9. A first channel 11 and a second channel 12 that are independent of each other are arranged between the inner ring 10 and the water-blocking cover 9. The first channel 11 is connected to the water outlet end 8 of the fish feces separator 6, and the second channel 12 is connected to the accommodating chamber 3.

[0038] The purification mechanism 13 includes a purification cartridge 14 and a purification assembly 15 disposed in the purification cartridge 14. A guide channel 16 is disposed in the accommodating chamber 3. The purification cartridge 14 is inserted into the guide channel 16. A water guide gap 17 connected to the first channel 11 is formed between the outer wall of the purification cartridge 14 and the inner wall of the guide channel 16. A water guide hole 18 connected to the water guide gap 17 is disposed on the side wall of the upper portion of the purification cartridge 14. A water outlet hole 19 connected to the second channel 12 is disposed at the lower portion of the purification cartridge 14.

[0039] The filter chamber 20 is provided in multiple numbers and is stacked up and down in the accommodating chamber 3;

[0040] The water pump 21 is arranged on the barrel cover 2 , the inlet of the water pump 21 is connected with the accommodating chamber 3 , and the outlet of the water pump 21 is connected with the water outlet pipe 5 .

[0041] Embodiment 2: As shown in the figure, different from Embodiment 1, the filter bin 20 includes a surrounding plate 22, a filter grille 23 and a guide tube 27. The filter grille 23 is fixed at the lower end of the surrounding plate 22, and a plurality of through grooves 24 are provided on the filter grille 23. A placement cavity 25 is formed between the surrounding plate 22 and the filter grille 23. A filter assembly 26 is placed in the placement cavity 25. The guide tube 27 is arranged to pass through from top to bottom. When multiple filter bins 20 are stacked up and down, the guide tube 27 of the upper filter bin 20 is inserted into the guide tube 27 of the lower filter bin 20 to form a guide channel 16.

[0042] The filter bin 20 improves the overall performance and stability of the fish tank filtration system. Specifically, the placement cavity 25 formed by the enclosure 22 and the filter grille 23 provides a stable installation space for the filter component 26. The design of multiple through grooves 24 ensures uniform distribution of water flow and maximizes the filtration efficiency. The filter component 26 can be flexibly replaced according to different purification needs, such as activated carbon, bioceramic rings, ion exchange resins, etc., to achieve refined and multi-level water purification.

[0043] The purpose of the guide cylinder 27 is to effectively achieve physical isolation between different filtration systems by forming an independent guide channel 16, preventing the purified water from directly mixing with the water to be purified, thereby ensuring that each filter chamber 20 can perform a specific filtering function. When multiple filter chambers 20 are stacked up and down, the guide cylinder 27 of the upper filter chamber 20 is accurately inserted into the guide cylinder 27 of the lower filter chamber 20, not only forming a continuous guide channel 16, but also constructing a strict water flow transmission system. In the guide channel 16, water can only be filtered by the purification component 15. Outside the guide channel 16, the water can pass through each filter chamber 20 in turn, and each layer can complete the corresponding purification treatment according to its specific filter component 26. In this process, it does not contact the water in the guide channel 16. This design not only improves the systematicness and accuracy of filtration, but also effectively avoids cross-contamination of filter media at different stages, and maximizes the continuity and thoroughness of water purification.

[0044] Preferably, the upper end of the guide cylinder 27 is higher than the upper end of the enclosure 22, and a limiting rib 28 is vertically provided on the outer wall of the guide cylinder 27. The inner wall of the bottom of the guide cylinder 27 has a limiting groove 29 matching the limiting rib 28. When multiple filter bins 20 are stacked up and down, the limiting rib 28 of the lower filter bin 20 is inserted into the limiting groove 29 of the upper filter bin 20.

[0045] In the above structure, the upper end of the guide tube 27 is higher than the enclosure 22, the outer wall is provided with a limiting rib 28, and the bottom inner wall has a matching limiting groove 29. This positioning mechanism provides an extremely accurate and stable connection scheme for the stacking assembly of the filter bins 20. When multiple filter bins 20 are stacked up and down, the limiting rib 28 of the lower filter bin 20 is accurately inserted into the limiting groove 29 of the upper filter bin 20, which not only realizes the precise positioning between the filter bins 20, but also effectively prevents the filter bins 20 from loosening or shifting in the vertical direction. The design of the guide tube 27 being higher than the enclosure 22 further enhances the stability of the stacking process, ensuring that each filter bin 20 can be docked to form a continuous and sealed water flow transmission system.

[0046] This structural design not only greatly improves the accuracy and reliability of assembly, but also simplifies the installation and disassembly process of the filter chamber 20. Users can easily adjust and replace the filter chamber 20 according to actual needs, thereby achieving fast and convenient maintenance. At the same time, this tight connection mechanism can also effectively reduce the bypass and leakage of water flow at the connection of the filter chamber 20, further ensuring the overall performance and efficiency of the water purification system.

[0047] Preferably, the purification component 15 includes a central tube 30 and filter cotton 31, a positioning column 32 is provided at the bottom of the purification cylinder 14, a positioning hole 33 is provided on the positioning column 32 which passes through from top to bottom, the lower end of the central tube 30 is inserted into the positioning hole 33, and a plurality of water filtering holes 34 are provided on the side wall of the central tube 30, the filter cotton 31 is sleeved on the central tube 30, and the lower end of the positioning column 32 extends out of the purification cylinder 14 and is located in the inner ring 10, so that the positioning hole 33 is connected to the second channel 12.

[0048] In the above structure, the positioning hole 33 on the positioning column 32 provides a precise installation position for the central tube 30, ensuring that the central tube 30 can be stably and vertically arranged in the purification cylinder 14. The design of multiple water filter holes 34 on the side wall can evenly disperse the water flow and significantly improve the filtration efficiency. The filter cotton 31 is sleeved on the central tube 30, which can not only intercept fine impurities, but also deeply adsorb and filter harmful substances in the water.

[0049] The lower end of the positioning column 32 extends out of the purification cylinder 14 and is located in the inner circle 10, thereby realizing direct communication between the positioning hole 33 and the second channel 12, so that the treated water can flow smoothly and orderly to the next treatment link. This structural design not only ensures the continuity and stability of the water flow, but also maximizes the thoroughness and efficiency of water purification through precise positioning and multi-layer filtration, providing a healthier and cleaner water quality guarantee for the ecological environment of the fish tank.

[0050] Embodiment 3: As shown in the figure, the difference from Embodiment 2 is that the purification component 15 includes a UV germicidal lamp 35 , and the UV germicidal lamp 35 is fixed in the purification cylinder 14 .

[0051] In this structure, the purification component 15 adopts UV sterilization, and the UV sterilization lamp 35 can effectively kill pathogens, bacteria and microorganisms in the water, and use the high-energy radiation of ultraviolet rays to directly destroy the DNA structure of microorganisms, thereby blocking their reproduction and growth, and achieving thorough microbial disinfection, providing a healthier and cleaner water environment for the fish tank ecosystem, greatly reducing the risk of fish disease, and reducing the need to use chemical disinfectants.

[0052] Embodiment 4: As shown in the figure, different from Embodiment 2, a retaining ring 36 is provided at the lower end of the purification cylinder 14 , and the inner wall of the retaining ring 36 is in close contact with the outer wall of the inner ring 10 .

[0053] The above design can not only prevent the water flow from bypassing or leaking between the purification cylinder 14 and the inner ring 10, but also ensure that the water must pass through the predetermined purification path, thereby maximizing the purification efficiency. The close fit between the retaining ring 36 and the inner ring 10 forms a nearly sealed transition area, effectively blocking the irregular diffusion of the water flow, and guiding the water to pass through each purification link along the preset optimal path, making the entire filtration process more efficient and stable.

[0054] Embodiment 5: As shown in the figure, different from Embodiment 4, a switching seat 37 is provided between the first channel 11 and the water outlet end 8 of the fish feces separator 6, and the switching seat 37 has a first passage and a second passage that are independent of each other. A switching valve 38 is provided on the switching seat 37, and the switching valve 38 can be switched between a first position and a second position. When in the first position, the switching valve 38 connects the first passage with the water outlet end 8 of the fish feces separator 6, and when in the second position, the switching valve 38 connects the second passage with an external sewage pipe 41.

[0055] The above structure provides a first passage and a second passage that are independent of each other inside the switching seat 37, and is equipped with a switching valve 38 that can be switched between two positions, so that the user can accurately control the discharge path of the water flow and achieve efficient treatment of fish feces and impurities. When in the first position, the switching valve 38 ensures that the water body is directly connected to the water outlet 8 of the fish feces separator 6 through the first passage, and continues to perform subsequent purification treatment; while in the second position, the switching valve 38 immediately directs the water flow into the external sewage pipe 41, quickly discharges the deposited fish feces and impurities, and does not need to tediously disassemble the filtering device.

[0056] This design not only greatly simplifies the fish tank maintenance process, but also effectively prevents the long-term accumulation of fish feces in the system, reduces the risk of water quality deterioration, and provides aquarium enthusiasts with a more efficient and hygienic filtration system solution, greatly improving the management convenience and cleanliness of the fish tank ecological environment.

[0057] Preferably, a sewage pipe 39 communicating with the accommodating chamber 3 is provided on the side wall of the barrel body 1 , a regulating valve 40 is installed on the sewage pipe 39 , and the sewage pipe 39 is communicated with a sewage discharge pipe 41 .

[0058] In the above structure, the sewage pipe 39 arranged on the side wall of the barrel body 1 introduces a key sewage discharge channel for the filtration system. The regulating valve 40 installed on the sewage pipe 39 provides a more sophisticated and flexible control mechanism for fish tank maintenance. This design allows the user to accurately adjust the flow rate and speed of sewage discharge. When cleaning the fish tank sediment or performing regular maintenance, the sewage discharge can be accurately controlled, avoiding the problems of water flow impact or poor sewage discharge that may occur in traditional methods.

[0059] The sewage pipe 39 is directly connected to the sewage pipe 41, ensuring that the sewage can be discharged from the system quickly and completely, which not only greatly simplifies the cleaning process, but also effectively prevents the accumulation of sewage in the filtration system, reducing the risk of bacterial growth and water quality deterioration.

[0060] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An external filter barrel for a fish tank, comprising a barrel body and a barrel cover, wherein the barrel body has a receiving cavity, the barrel cover is movably arranged on the barrel body to cover the receiving cavity, and the barrel cover is also provided with a water inlet pipe and a water outlet pipe, characterized in that: Also includes, A fish excrement separator is arranged in the barrel, the fish excrement separator has a water inlet end and a water outlet end, and the water inlet end of the fish excrement separator is connected to the water inlet pipe; A water-blocking cover is fixed to the bottom of the accommodating chamber, an inner ring is coaxially arranged in the water-blocking cover, and a first channel and a second channel independent of each other are arranged between the inner ring and the water-blocking cover, the first channel is connected to the water outlet end of the fish feces separator, and the second channel is connected to the accommodating chamber; The purification mechanism comprises a purification cylinder and a purification component arranged in the purification cylinder, wherein a guide channel is arranged in the accommodating chamber, the purification cylinder is inserted into the guide channel, and a water guide gap connected to the first channel is formed between the outer wall of the purification cylinder and the inner wall of the guide channel, a water guide hole connected to the water guide gap is arranged on the side wall of the upper part of the purification cylinder, and a water outlet hole connected to the second channel is arranged at the lower part of the purification cylinder; A plurality of filter bins are provided, and are stacked up and down in the accommodating cavity; A water pump is arranged on the barrel cover, an inlet of the water pump is connected to the accommodating cavity, and an outlet of the water pump is connected to the water outlet pipe.

2. The external filter barrel for fish tank according to claim 1, characterized in that: The filter bin includes a surrounding plate, a filter grille and a guide tube. The filter grille is fixed at the lower end of the surrounding plate, and a plurality of through grooves are arranged on the filter grille. A placement cavity is formed between the surrounding plate and the filter grille. A filter assembly is placed in the placement cavity. The guide tube is arranged to pass through from top to bottom. When a plurality of the filter bins are stacked up and down, the guide tube of the upper filter bin is inserted into the guide tube of the lower filter bin to form the guide channel.

3. The external filter barrel for fish tank according to claim 2, characterized in that: The upper end of the guide cylinder is higher than the upper end of the enclosure plate, and the outer wall of the guide cylinder is vertically provided with a limiting rib, and the inner wall of the bottom of the guide cylinder has a limiting groove matching the limiting rib. When multiple filter bins are stacked up and down, the limiting rib of the lower filter bin is inserted into the limiting groove of the upper filter bin.

4. The external filter barrel for fish tank according to claim 1, characterized in that: The purification component includes a central tube and filter cotton. A positioning column is provided at the bottom of the purification cylinder. A positioning hole is provided on the positioning column and passes through the central tube from top to bottom. The lower end of the central tube is inserted into the positioning hole, and a plurality of water filtering holes are provided on the side wall of the central tube. The filter cotton is sleeved on the central tube. The lower end of the positioning column extends out of the purification cylinder and is located in the inner circle, so that the positioning hole is connected to the second channel.

5. The external filter barrel for fish tank according to claim 1, characterized in that: The purification component comprises a UV sterilizing lamp, and the UV sterilizing lamp is fixed in the purification cylinder.

6. The external filter barrel for fish tank according to claim 1, characterized in that: A retaining ring is arranged at the lower end of the purification cylinder, and the inner wall of the retaining ring is in close contact with the outer wall of the inner ring.

7. The external filter barrel for fish tank according to claim 1, characterized in that: A switching seat is provided between the first passage and the water outlet end of the fish feces separator, and the switching seat has a first passage and a second passage which are independent of each other. A switching valve is provided on the switching seat, and the switching valve can be switched between a first position and a second position. When in the first position, the switching valve connects the first passage with the water outlet end of the fish feces separator, and when in the second position, the switching valve connects the second passage with an external sewage pipe.

8. The external filter barrel for fish tank according to claim 7, characterized in that: A sewage pipe connected with the accommodating chamber is arranged on the side wall of the barrel body, a regulating valve is installed on the sewage pipe, and the sewage pipe is connected with the sewage discharge pipe.

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