Self-cleaning fish toilet

Abstract

This self-cleaning fish toilet involves a fish waste filter. The casing is divided from top to bottom into a main filter chamber, a slow-flow sedimentation chamber, an air isolation chamber, and a fish waste collection chamber. The top cover of the casing has an inlet and a first outlet. The main filter chamber includes a cylindrical filter screen placed inside the casing, with the inlet and first outlet connecting to the outside / inside of the filter screen, respectively. The slow-flow sedimentation chamber includes a fish waste sedimentation port on a partition, and a backflow prevention filter screen below the partition. The backflow prevention filter screen includes a lower screen and / or a side screen. The fish waste sedimentation port is guided to a funnel through a fish waste channel, and a fish waste collection chamber is located below the funnel, connected to a drain outlet. The beneficial effects are: 1. The outside and inside of the filter screen are relatively isolated, connected to the inlet and first outlet respectively. 2. A scraping device connecting to the second outlet is provided on the outside of the filter screen. 3. The slow-flow sedimentation chamber is equipped with a backflow prevention filter screen. Overall, the separation and sedimentation effect is good.

Description

Technical Field

[0001] This utility model relates to the field of filtration device technology, and more particularly to fish waste filters, especially a self-cleaning fish toilet. Background Technology

[0002] In ornamental fish farming, fish waste and food residue can affect water quality. Toilet-style fish waste separators (referred to as "fish toilets") have emerged on the market, designed to isolate waste before it reaches the filter canister. They utilize a vortex or gravity settling principle, offering advantages such as: 1. Highly efficient solid-liquid separation, maintaining water quality. Using sedimentation and strong discharge principles, solid waste is intercepted and easily discharged, significantly reducing the formation rate of ammonia, nitrite, and nitrate in the water, resulting in clearer water. 2. Reduced burden on the main filtration system. With a large amount of solid waste no longer entering the filter media, biological chamber, and bio-balls, the clogging cycle of the filter media is significantly extended, saving time on washing / changing the filter media and extending its lifespan. By reducing solid waste at the source, the required biological filter media is naturally reduced, as is the accumulation of nitrates, the final product of biological filtration, allowing for extended water change cycles – a win-win situation. 3. Compact size. Compared to traditional sedimentation tanks or sedimentation containers, the "fish toilet" takes up very little cabinet space, making it especially suitable for small tanks and limited spaces. 4. Simple installation and maintenance. Most only require connecting to the existing water inlet pipe after purchase, making waste discharge easy. Those with automatic screen cleaning functions are even more convenient, and even beginners can operate it easily. 5. High versatility and flexible upgrades. Various sizes are available on the market to match different flow rates, allowing for the addition of bottom filters, top filters, and side filters. Further upgrades can be made simply by replacing the container with a larger one or adjusting the water pump flow. In short, the fish toilet integrates "sedimentation, isolation, and then powerful drainage" into a minimal space, achieving long-term stable water quality with minimal maintenance costs. It is the preferred solution for small bottom-filtered aquariums or fishkeepers with limited space, saving time, effort, and filter media.

[0003] While some vendors market fish toilets as a "lazy person's dream," they have the following drawbacks: 1. The contradiction between flow rate and sedimentation. Fish toilets rely on the principle of "slow flow rate + gravity sedimentation." Increasing the flow rate of the aquarium circulation pump drastically reduces the sedimentation effect, and may even stir up already settled waste again. Actual measurements show that the pump flow rate generally cannot exceed 2000-3000L / H, otherwise the sedimentation effect is poor. This means that medium to large aquariums are basically unsuitable. 2. Space limitations. The limited size of fish toilets results in a small sedimentation area, leading to insufficient sedimentation and incomplete emptying. 3. Increased cleaning trouble. Although it reduces the frequency of washing cotton, the fish toilet itself requires regular flushing and cleaning, increasing maintenance points. 4. Limited applicability. It is only suitable for bare tanks, general density, small to medium water volumes, and low flow rates. 5. Due to the influence of flow rate and water circulation speed on the filter screen, a finer mesh not only affects the flow rate but also easily leads to the formation of bacterial film. Combined with the stickiness of fish waste, this can cause clogging. Therefore, the filter screen generally cannot be made very fine, typically between 30 and 80 mesh. This means it cannot filter smaller solid particles, preventing the water from achieving the required clarity and transparency. This necessitates further physical filtration with the next stage of filter media. While this effectively reduces the frequency of filter media washing, it still requires the inconvenience of cleaning the media. In short, a fish toilet is essentially a "miniature sedimentation chamber." It can play a certain role under low to medium flow rates, small spaces, and low load conditions, but for some fishkeepers, while it doesn't save time, it can actually add to the hassle.

[0004] Currently, the fish toilets sold on the market have inconsistent interception and separation effects. The principle of fish toilet feces separators is to use the difference in specific gravity between liquid and solid to separate them through sedimentation. Only fish with a higher specific gravity can be effectively intercepted intact. The disadvantage of the belt is that it cannot separate fish waste that has a lower specific gravity and floats, which is dispersed by water. This floating waste is intercepted by the filter screen, but if it gets stuck on the fish toilet filter screen, it will cause the screen to become clogged after a long period of use, and manual cleaning is required. Although there are now more advanced automatic screen cleaning technologies, such as using a high-speed motor with an impeller to wash the filter screen with high-speed water flow, or manually using a magnetic brush to clean the filter screen, and timed automatic cleaning can also be achieved. However, the waste removed from the screen cannot be collected. It can only be broken up and dispersed by the automatic cleaning water flow, or broken up and dispersed into fine particles by manual brushing and pass through the filter screen to the next stage of filter cotton, which still requires filter cotton cleaning. This fish toilet technology based on the sedimentation principle has reached its limit and is difficult to improve. Utility Model Content

[0005] The purpose of this invention is to provide a self-cleaning fish toilet that intercepts finer particles without clogging the screen, has a good filtration effect, and is easy to clean and maintain.

[0006] The objective of this utility model is achieved through the following solution: A self-cleaning fish toilet includes a cylindrical shell, which, from top to bottom, is divided into a main filter chamber, a slow-flow sedimentation chamber, and a fish waste collection chamber. The cap at the top of the shell has an inlet and a first outlet. Its distinguishing feature is: The main filter chamber includes: a barrel-shaped filter screen placed inside the cylindrical shell, with the inlet and the first outlet connected to the outside / inside of the filter screen, respectively; The slow-flow sedimentation chamber includes: a fish waste sedimentation port on the partition, and an anti-backflow filter screen below the partition; the anti-backflow filter screen includes a lower net and / or a side net. The fish waste sedimentation outlet is guided to the funnel through the fish waste channel. A fish waste collection chamber is set below the funnel, and the fish waste collection chamber is connected to the sewage outlet.

[0007] further: The filter screen is made of cotton.

[0008] An air isolation chamber is provided between the slow-flow sedimentation chamber and the fish waste collection chamber. The air isolation chamber is located in the space between the upper and lower edges of the funnel and the cylindrical shell.

[0009] One or more scraping devices are provided outside the filter screen; the structure of the scraping device is as follows: the scraper is long and narrow with a cavity inside, and several suction holes are provided on the inner surface of the scraper. The suction holes communicate with the cavity. A through-hole is provided above the scraping device, which connects to a second water outlet. The second water outlet is located on the cover and may or may not have a valve.

[0010] The inner surface of the scraper is provided with a longitudinal spine.

[0011] One to four fish waste sedimentation ports and corresponding fish waste channels can be provided. Each fish waste sedimentation port is equipped with a sealing valve, which is a strip plate that can rotate around the center. One end of the sealing valve is equipped with a sealing valve magnetic plate, which cooperates with a magnetic plate outside the shell. By moving the magnetic plate, the sealing valve can be rotated, thereby partially or completely sealing the fish waste sedimentation port.

[0012] The anti-backflow filter is equipped with a rotating brush. The rotating brush has the following structure: a shaft is set in the center of the rotating rod, and a rotating brush is set on the rotating rod. The rotating brush includes a bottom brush and / or a transverse brush. The bottom brush is set on the upper or lower layer of the lower screen.

[0013] The funnel has the following structure: the main body is a V-shaped body or a V-shaped body with a columnar tube at the bottom, and an outer cylinder may or may not be provided around the V-shaped body.

[0014] The cover is equipped with a geared motor and / or a manual handle. The geared motor and / or the manual handle are engaged and linked with the filter screen and the rotating brush. The rotation of the geared motor and / or the manual handle can drive the rotation of the filter screen and the rotating brush to clean the filter screen through the scraping device and the anti-backflow filter screen through the rotating brush.

[0015] Both the inlet and the first outlet are equipped with valves.

[0016] The beneficial effects of this utility model are as follows: 1. The main filter chamber is equipped with a filter screen with good internal and external isolation. The filter screen is cylindrical and placed inside the cylindrical shell. The filter screen is made of filter cotton, i.e., a cotton filter screen (traditionally a metal filter screen, but the metal filter screen is replaced with a cotton filter screen, which on the one hand better isolates the inside and outside, and on the other hand can also better reduce the amount of filter cotton in the lower stage). This makes the cotton filter screen better isolated from the inside and outside. The outside / inside of the cotton filter screen is connected to the water inlet / first water outlet respectively. Under the combined action of the water inlet push and the water outlet suction, the liquid flow rate outside the cotton filter screen is accelerated. Most of the fish waste with a high specific gravity can sink smoothly and enter the slow flow sedimentation chamber from the fish waste sedimentation port. It is quickly settled and isolated to the fish waste collection chamber (dead water storage area) below the funnel, and finally cleaned through the sewage outlet. This greatly reduces the time that solid impurities stay and swirl in the main filter chamber, thereby improving the separation and sedimentation effect and greatly improving the overall performance. 2. The slow flow sedimentation chamber is equipped with an anti-backflow filter screen to prevent the backflow of lightly floating impurities and intercept the floating impurities that are sucked in (only a small amount of scattered floating impurities are sucked in). 3. By adjusting the valve on the fish waste sedimentation outlet, the flow rate of water after being intercepted by the filter screen in the slow-flow sedimentation chamber can be regulated, thus improving the overall interception, separation, and sedimentation performance. 4. A scraping device and immediate cleaning and collection direct discharge are added. By closing the fish waste sedimentation outlet valve, the scraping device scrapes off the impurities hanging on the cotton filter screen and sucks them into its cavity. Finally, it is quickly sucked out through the second outlet and filtered and reused by the filtration device; thus, the cotton filter screen is quickly cleaned and discharged, making it possible to remove waste without washing the filter screen. In summary, this invention significantly improves the fish waste separation and cleaning performance, enabling easy cleaning and waste discharge.

[0017] To enable those skilled in the art to better understand the present invention and to make the above-mentioned objectives, features and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to embodiments. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model. Figure 2 This is a schematic diagram of the scraping device structure in Embodiment 1 of this utility model. Figure 3 This is a schematic diagram of the slow-flow sedimentation tank structure in Embodiment 1 of this utility model; Figure 4 This is a schematic diagram of the structure of Embodiment 2 of this utility model. Figure 5 This is a schematic diagram of the slow-flow sedimentation tank structure in Example 2.

[0019] Figure 1 , Figure 2 , Figure 3In the middle section: 1 is the geared motor, 2 is the manual handle, 3 is the screw cap, 4 is the second water outlet, 5 is the sealing cap, 6 is the scraping device, 61 is the scraper, 62 is the cavity, 63 is the through port, 7 is the slow-flow sedimentation chamber, 71 is the side net, 72 is the partition, 73 is the lower net, 8 is the funnel, 9 is the sewage outlet, 11 is the first water outlet, 12 is the water inlet, 13 is the filter screen, 14 is the fish waste sedimentation outlet, 15 is the fish waste channel, 16 is the air isolation chamber, 17 is the cylinder shell, 18 is the bottom support, 19 is the annular groove, 21 is the screw hole, 22 is the screw, 23 is the support shaft, 24 is the transverse brush, 25 is the bottom brush, 26 is the scraper insertion hole, and 27 is the shaft hole.

[0020] Figure 4 , Figure 5 In the middle section: 1 is the geared motor, 2 is the manual handle, 3 is the screw cap, 4 is the second water outlet, 5 is the sealing cap, 6 is the scraping device, 64 is the suction hole, 72 is the partition, 74 is the lower net, 8 is the funnel, 81 is the V-shaped body, 82 is the columnar tube, 83 is the outer cylinder, 9 is the sewage outlet, 11 is the first water outlet, 14 is the fish waste sedimentation outlet, 18 is the bottom support, 26 is the scraper insertion hole, 31 is the lock, 32 is the connecting screw, 33 is the fish waste channel, 34 is the brush rod, 35 is the brush, 37 is the shaft hole, 38 is the sealing valve, and 39 is the sealing valve magnetic plate. Detailed Implementation Example

[0021] like Figure 1 , Figure 2 , Figure 3 As shown, the self-cleaning fish toilet includes a cylindrical shell 17. From top to bottom, the cylindrical shell 17 is divided into a main filter chamber, a slow-flow sedimentation chamber 7, an air isolation chamber 16, and a fish waste collection chamber. A bottom support 18 is provided at the bottom, and a cover 5 is provided at the top. A water inlet 12 and a first water outlet 11 are provided on the cover 5 above the cylindrical shell 17.

[0022] The main filter chamber includes: a barrel-shaped filter screen 13 (i.e., a cotton filter cylinder with a bottom) placed inside the shell 17. The filter screen 13 is made of filter cotton (i.e., a cotton filter screen, which has good internal and external isolation effect, and compared with metal filter screens, the cotton filter screen has better interception of small particles, thus reducing the amount of filter cotton in the lower stage). The inlet 12 is connected to the outside of the filter screen 13, and the first outlet 11 is connected to the inside of the filter screen 13. Wastewater containing fish feces and debris discharged from the drain pipe of the fish tank (aquarium) enters the main filter chamber through the inlet 12 and rotates and sinks along the outside of the filter screen 13. The water returning inside the filter screen 13 is introduced into other filtration devices through the first outlet 11 and enters the fish tank (aquarium) after filtration.

[0023] The slow-flow sedimentation chamber 7 includes: an anti-backflow filter (its function is to prevent or reduce the backflow of lightly floating impurities; after being intercepted by the anti-backflow filter, most of the floating impurities slowly sink, improving separation and sedimentation efficiency, thereby cleaning the water flow), its structure includes: a baffle 72 (which can be circular or annular) with a fish waste sedimentation port 14, a scraper insertion hole 26 on the baffle 72 for fixing the scraping device 6; below the baffle 72 is a barrel-shaped mesh, including a side mesh 71 and a lower mesh 73. A sealing valve (magnetic valve) is installed on the fish waste sedimentation port 14. Figure 1 Not shown in the middle, see Figure 5 If necessary, the fish waste settling inlet 14 can be partially or completely covered by the sealing valve. The sealing valve is equipped with an internal magnet. The external magnet attracts the internal magnet outside the cylinder shell 17, thereby rotating the sealing valve to close or partially close the fish waste settling inlet 14. By extracting the liquid from the slow-flow settling chamber, the fish waste is reduced from circulating and staying in the main filter chamber (outside the filter screen 13), and enters the slow-flow settling chamber more quickly, improving the separation and settling effect.

[0024] Fish waste and other debris enter the fish waste sedimentation port 14 and are then introduced into the funnel 8 through the fish waste channel 15. Larger and heavier debris falls into and settles in the fish waste collection chamber at the bottom of the cylinder shell 17 and can be discharged through the drain port 9; smaller and lighter debris mostly falls slowly, while a small portion is sucked towards the anti-backflow filter screen by the suction of the water outlet. After being intercepted by the anti-backflow filter screen, some of it falls, while a small portion sticks to the anti-backflow filter screen.

[0025] The structure of funnel 8 is as follows: the main body is V-shaped, the upper diameter matches the inner diameter of the shell 17, and the upper diameter of the funnel is larger than the lower diameter (generally, the upper diameter is 3-8 times the lower diameter). Between the upper and lower edges of funnel 8 ( Figure 1 (At the dotted line), an air isolation chamber 16 is formed. The funnel-shaped air isolation chamber 16 is connected to the slow-flow sedimentation chamber at the top and the fish waste collection chamber at the bottom; at the bottom of the funnel 8, the water contact surface is reduced, which helps to reduce the backflow of debris from the fish waste collection chamber.

[0026] A scraping device 6 is provided on the outer side of the filter screen 13. One or more scraping devices 6 are provided (generally 1-4). The scraping device 6 is elongated, and its cross-section can be crescent-shaped, semi-circular, semi-elliptical, trapezoidal, rectangular, etc. The structure is as follows: the lower end of the scraper 61 is fixed in the scraper insertion hole 26 provided on the partition plate 72; the inner surface of the scraper 61 can be provided with a longitudinal spine (the spine can be made of hard or soft material) to scrape away dirt adhering to the filter screen 13. The scraper 61 has a cavity 62 inside, and the inner arc surface of the scraper 61 matches the arc surface of the filter screen 13. Several suction holes are provided on the inner arc surface of the scraper 61. Figure 2 Not shown, please refer to Figure 4The suction hole is connected to the cavity 62 to absorb small particles of debris. The upper end of the scraping device 6 is connected to the annular groove 19 (used to cooperate with the wire cover 3 to achieve a seal with the sealing cover 5; opening the wire cover 3 allows the filter screen 13 to be lifted out for cleaning). The scraping device 6 is provided with a through port 63 above it, and the cavity 62 is connected to the through port 63, which is connected to the second outlet 4. The second outlet 4 leads to the filter media, and after filtration by the filter media, it can be cleaned and reused. During normal operation, the water flow can be adjusted by the number of fish waste sedimentation ports 14 sealed by the sealing valve, so that the water flow is slow and the debris can be slowly settled. When suctioning, the fish waste sedimentation port 14 is closed, the external pipe valve is opened or the suction device is turned on, and the filter screen 13 is rotated by the geared motor 1 or the manual handle 2. The scraper 61 can scrape off the dirt attached to the filter screen 13 and suck it in through the suction hole, and guide it to the second outlet 4 through the cavity 62.

[0027] One to four fish waste sedimentation ports 14 and corresponding fish waste channels 15 can be provided.

[0028] The anti-backflow filter screen is equipped with a rotating brush. The rotating brush has the following structure: a screw hole 21 is provided below the filter screen 13, the screw 22 of the rotating brush is placed in the screw hole 21, and a support shaft 23 is provided below the rotating brush. The support shaft 23 is placed in the shaft hole 27 in the center of the lower screen 27 of the filter disc 7. The rotating brush is equipped with a transverse brush 24 and a bottom brush 25. The bottom brush 25 can be set on the upper or lower surface of the lower screen 27. The rotation of the rotating brush can clean the side screen 71 and the lower screen 73. Alternatively, the side screen can be removed, and the lower screen can be enlarged to form a lower screen with a diameter that matches the inner diameter of the shell 17 (see Embodiment 2). Figure 4 , Figure 5 ).

[0029] The cover is equipped with a geared motor 1 and / or a manual handle 2. The shaft of the geared motor 1 and / or the manual handle 2 are connected to the filter screen 13 (with a connecting hole or rod at the bottom) and the rotating brush via a screw, screw hole, and connecting shaft. This allows the geared motor 1 and / or the manual handle 2 to drive the rotation of the filter screen 13 and the rotating brush, facilitating the cleaning of the filter screen 13 by the scraping device and the cleaning of the anti-backflow filter screen by the rotating brush. Alternatively, a ratchet mechanism can be used, where the scraping device 6 cleans the filter screen 13 when rotating forward and the rotating brush cleans the barrel-shaped mesh when rotating in reverse. The geared motor 1 can also be a bidirectional motor for repeated cleaning.

[0030] Valves are installed at the inlet, the first outlet, and the second outlet. The valve at the inlet acts as the overall control for water intake. With the valve at the inlet fixed, the valves at the first and second outlets have an inverse relationship. By adjusting the valves at the first and second outlets, the water flow can be controlled to be as smooth as possible, thereby achieving the best separation and sedimentation effect for impurities. Example

[0031] like Figure 4 , Figure 5 As shown ( Figure 4 For icons not marked in the text, please refer to [link / reference]. Figure 1 , 2 3) Self-cleaning fish toilet, including a cylindrical casing 17 (see Figure 1 The shell 17, from top to bottom, is divided into a main filter chamber, a slow-flow sedimentation chamber, and an air isolation chamber 16 (see...). Figure 1 The fish waste collection bin, similar to or the same as in Example 1, includes: a reduction motor 1, a manual handle 2, a threaded cap 3, a second water outlet 4, a sealing cap 5, a bottom support 18 and a drain outlet 9 at the bottom of the cylindrical shell 17, and a sealing cap 5 at the top of the cylindrical shell 17; the sealing cap 5 has a water inlet 12 (see...). Figure 1 ) and the first outlet 11. The function of the screw cap 3 is the same as in Example 1.

[0032] Unlike Example 1: 31 The latch is located between the cover 5 and the cylindrical shell 17 to fasten and fix the cover 5.

[0033] In Example 1, the suction holes of the scraping device 6 are not shown. In Example 2, the suction holes 64 of the scraping device 6 are shown. The suction holes 64 are numerous and have small diameters. The size of the suction holes 64 is required to fully cover the filter screen 13 while minimizing the adsorption area to maintain the strongest possible suction force on the filter screen 13. The diameter (orifice) of the suction holes 64 can generally be considered to be 1-8 mm; if the suction force is high, the diameter (orifice) can be appropriately increased.

[0034] The funnel 8, also known as an "adjustable self-breathing funnel," has the following structure: the main body is a V-shaped body 81, with the upper diameter larger than the lower diameter (generally, the upper diameter is 3-8 times the lower diameter). A columnar tube 82 is installed below the V-shaped body 81, and an outer cylinder 83 is installed around the V-shaped body 81. The height of the outer cylinder 83 is less than or equal to the height of the V-shaped body 81. The vertical position of the funnel 8 is adjustable (magnetic plates can be installed on the outer cylinder 83, so that the vertical position of the outer cylinder 83 can be moved by operating the corresponding outer magnetic plates, thereby fixing it relatively in the shell 17), to accommodate both large and small fish waste volumes. The funnel 8 is generally adjusted as low as possible so that when waste is discharged through the drain outlet 9, less water can be used to achieve the purpose of waste discharge.

[0035] The slow-flow sedimentation chamber includes: a connecting screw 32 in the center of a partition 72 for connecting to the bottom plate of the filter screen 13; a backflow prevention filter screen supported by a lower screen 74, which is circular (ring-shaped); a brush rod 34 below the lower screen 74, with its shaft connected to the screw 32, and brushes 35 at both ends; and two fish waste sedimentation ports 14 (corresponding to two fish waste channels 33) on the partition 72 for allowing fish waste to settle downwards. A reduction motor 1 or a manual handle 2 engages with the filter screen 13, screw 32, and brush rod 34. Rotation of the reduction motor 1 or manual handle 2 drives the filter screen 13 and brush rod 34 to rotate, thereby cleaning the lower screen 74 with the brushes 35.

[0036] The partition plate 72 is provided with a scraper insertion hole 26 for fixing the upper part of the scraper 61; the connecting screw 32 can be installed in the shaft hole 37, and the sealing valve 38 rotates around the fixed shaft hole 37. The sealing valve 38 is a strip plate, and a sealing valve magnetic piece 39 is provided at one end of the sealing valve 38. The magnetic piece (set inside the cylinder shell 17) cooperates with the magnetic piece set outside the cylinder shell 17 to rotate the sealing valve 38, thereby partially or completely sealing the fish waste sedimentation port 14.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A self-cleaning fish toilet, comprising a cylindrical shell, the shell being divided from top to bottom into a main filter chamber, a slow-flow sedimentation chamber, and a fish waste collection chamber; the cap at the top of the shell is provided with a water inlet and a first water outlet, characterized in that: The main filter chamber includes: a barrel-shaped filter screen placed inside the cylindrical shell, with the inlet and the first outlet connected to the outside / inside of the filter screen, respectively; The slow-flow sedimentation chamber includes: a fish waste sedimentation port on the partition, and an anti-backflow filter screen below the partition; the anti-backflow filter screen includes a lower net and / or a side net. The fish waste sedimentation outlet is guided to the funnel through the fish waste channel. A fish waste collection chamber is set below the funnel, and the fish waste collection chamber is connected to the sewage outlet.

2. The self-cleaning fish toilet according to claim 1, characterized in that: The filter screen is made of cotton.

3. The self-cleaning fish toilet according to claim 1, characterized in that: An air isolation chamber is provided between the slow-flow sedimentation chamber and the fish waste collection chamber. The air isolation chamber is located in the space between the upper and lower edges of the funnel and the cylindrical shell.

4. The self-cleaning fish toilet according to claim 1 or 2, characterized in that: One or more scraping devices are provided outside the filter screen; the structure of the scraping device is as follows: the scraper is long and narrow with a cavity inside, and several suction holes are provided on the inner surface of the scraper. The suction holes communicate with the cavity. A through-hole is provided above the scraping device, which connects to a second water outlet. The second water outlet is located on the cover and may or may not have a valve.

5. The self-cleaning fish toilet according to claim 4, characterized in that: The inner surface of the scraper is provided with a longitudinal spine.

6. The self-cleaning fish toilet according to claim 1, characterized in that: One to four fish waste sedimentation ports and corresponding fish waste channels can be provided. Each fish waste sedimentation port is equipped with a sealing valve, which is a strip plate that can rotate around the center. One end of the sealing valve is equipped with a sealing valve magnetic plate, which cooperates with a magnetic plate outside the shell. By moving the magnetic plate, the sealing valve can be rotated, thereby partially or completely sealing the fish waste sedimentation port.

7. The self-cleaning fish toilet according to claim 1, characterized in that: The anti-backflow filter is equipped with a rotating brush. The rotating brush has the following structure: a shaft is set in the center of the rotating rod, and a rotating brush is set on the rotating rod. The rotating brush includes a bottom brush and / or a transverse brush. The bottom brush is set on the upper or lower layer of the lower screen.

8. The self-cleaning fish toilet according to claim 1, characterized in that: The structure of the funnel is as follows: The main body is a V-shaped body or a V-shaped body with a columnar tube at the bottom, with or without an outer cylinder around the V-shaped body.

9. The self-cleaning fish toilet according to claim 1, characterized in that: The cover is equipped with a geared motor and / or a manual handle. The geared motor and / or the manual handle are engaged and linked with the filter screen and the rotating brush. The rotation of the geared motor and / or the manual handle can drive the rotation of the filter screen and the rotating brush to clean the filter screen through the scraping device and the anti-backflow filter screen through the rotating brush.

10. The self-cleaning fish toilet according to claim 1, characterized in that: Both the inlet and the first outlet are equipped with valves.

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