Fish tank with automatic water replenishing device

Abstract

The utility model discloses a fish tank with an automatic water replenishing device, which comprises a support, a bottom filter tank arranged at the bottom of the support, a main tank arranged at the top of the support, a first drain pipe and a first water supply pipe arranged between the main tank and the bottom filter tank, and an automatic water replenishing tank comprising a clean water tank and a waste water tank, a first pipeline for communicating the main tank with the wastewater tank is arranged between the main tank and the wastewater tank, a flow control valve is arranged on the first pipeline, a first floating ball valve for controlling the water outlet of the first pipeline is arranged in the wastewater tank, and the water level of the purified water tank is higher than that of the bottom filter tank; and a second floating ball valve for controlling the water outlet of the second pipeline is arranged in the bottom filtering cylinder. Compared with the prior art, the water purifier has the advantages that the speed of feeding water into the bottom filter tank from the water purifying tank and the water changing amount can be controlled by adjusting the flow control valve, the concentration of chlorine in water is controlled within the range which can be borne by fishes, water trapping is not needed, a small amount of water is changed for multiple times, and the stimulation of new water to the fishes is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to fish tank technical field especially relates to a fish tank with automatic water replenishing device. BACKGROUND

[0002] Fish will continuously produce excrement and residual food residues in the process of using fish tank, these substances will decompose in water, produce harmful substances such as ammonia nitrogen, nitrite, etc. that affect the health of fish, in order to ensure the quality of fish tank water, water is usually changed regularly to effectively reduce the concentration of these harmful substances, keep the water clean.

[0003] Such as patent publication no. CN210094384U Chinese utility model patent "fish tank automatic purification equipment", including physical filtration area, biochemical filtration area and water trap area, the water inlet of water trap area is connected with external water source, the water outlet is connected with the biochemical filtration area leading to fish tank, the water inlet of physical filtration area is connected with fish tank, the physical filtration area has two water outlets, one water outlet is connected with sewage gate, another water outlet is connected with the water inlet of biochemical filtration area, another water inlet of biochemical filtration area is connected with the water outlet of water trap area.

[0004] In the above scheme, when the fish tank is changed, the tap water source needs to be trapped to reduce the chlorine concentration in the water body to reduce the harm to the fish, but the water trapping time is long, and the fish tank cannot be changed or supplemented at any time. UTILITY MODEL CONTENTS

[0005] The utility model discloses a fish tank with automatic water replenishing device to solve the above problems.

[0006] The utility model discloses a fish tank with automatic water replenishing device to solve the above problems.

[0007] The further preferred scheme of the utility model is: the water tank is connected with water source, the bottom of the wastewater tank is equipped with a drain pipe, one end of the drain pipe penetrates the bottom wall of the wastewater tank and communicates with the wastewater tank, the other end is located outside the wastewater tank, and the end located outside the wastewater tank is equipped with a first valve for opening or closing the drain pipe.

[0008] The further preferred scheme of the utility model is: the main cylinder comprises a fish breeding area and a sedimentation area, the sedimentation area and the bottom of the fish breeding area are equipped with a fish comb opening for communication, the first pipeline has a first water inlet and a first water outlet, the first water inlet is arranged at the bottom of the sedimentation area, the first water outlet is arranged in the wastewater tank, and the first floating ball valve is fixed to the upper side of the wastewater tank and connected with the first pipeline to control the opening or closing of the first water outlet.

[0009] The further preferred scheme of the utility model is: a water guide area is arranged in the sedimentation area, the top of the water guide area is lower than the top of the sedimentation area, so that the water in the sedimentation area can overflow the top of the water guide area and enter the water guide area, and the upper end of the first drain pipe is located in the water guide area.

[0010] The further preferred scheme of the utility model is: the bottom filter cylinder comprises a filter bin and a water pump bin which are in communication with each other, the filter bin is equipped with a filter device for filtering water, the lower end of the first drain pipe is located in the filter bin, and the main cylinder water pump is arranged in the water pump bin.

[0011] The further preferred scheme of the utility model is: the second pipeline has a second water inlet and a second water outlet, the second water inlet is arranged at the bottom of the water tank, the second water outlet is arranged in the water pump area, and the second floating ball valve is connected with the second pipeline and controls the opening or closing of the second water outlet.

[0012] The further preferred scheme of the utility model is: the filter bin comprises a fish excrement separation chamber and a dripping filtration chamber, the fish excrement separation chamber is sequentially provided with a water inlet chamber, a fish excrement filtration chamber and a fish excrement collection chamber from top to bottom, the fish excrement filtration chamber is provided with a fish excrement filtration barrel with an upper end extending into the water inlet chamber and a lower end extending into the fish excrement collection chamber, the fish excrement filtration barrel has an opening in communication with the upper and lower portions, the lower end of the first drain pipe is located in the water inlet chamber, the side wall of the fish excrement filtration barrel is provided with a plurality of filter holes, and the fish excrement collection chamber has a top overflow port in communication with the dripping filtration area.

[0013] The further preferred scheme of the utility model is: a plurality of layers of dripping filter material boxes are arranged in the dripping filtration chamber, the lowermost dripping filter material box has a spacing from the bottom wall of the dripping filtration chamber, the top of the uppermost dripping filter material box is provided with a flow guide plate, and a plurality of flow guide holes are arranged on the flow guide plate.

[0014] The further preferred scheme of the utility model is: L-shaped flush pipe which is communicated with the first upper water pipe and is perpendicular to the first upper water pipe is arranged on the first upper water pipe in the water pump chamber, the flush pipe is provided with the second valve which controls the opening and closing of the flush pipe, the fish excrement collecting chamber, the drip filtration chamber and the lower side of the water pump area are respectively provided with the sewage discharge pipeline which extends into the chamber, the third valve is arranged on the three sewage discharge pipelines.

[0015] The further preferred scheme of the utility model is: the vice cylinder is arranged between the main cylinder and the bottom cylinder, the second upper water pipe which communicates the vice cylinder with the water pump chamber is arranged between the vice cylinder and the water pump chamber, the vice cylinder water pump is connected with the second upper water pipe.

[0016] Compared with the prior art, the utility model has the advantages that: the automatic water supplementing tank is arranged, the water level of the main cylinder is higher than that of the waste water tank, the first pipeline which communicates the main cylinder with the waste water tank is arranged between the main cylinder and the waste water tank, the flow control valve is arranged on the first pipeline, the first float ball valve which controls the water outlet of the first pipeline is arranged in the waste water tank, the water level of the clean water tank is higher than that of the bottom filter cylinder, the second pipeline which communicates the clean water tank with the bottom filter cylinder is arranged between the clean water tank and the bottom filter cylinder, the second float ball valve which controls the water outlet of the second pipeline is arranged in the bottom filter cylinder, the flow control valve controls the speed and the amount of the water outlet of the first pipeline, thereby controlling the speed and the amount of the water inlet of the clean water tank to the bottom filter cylinder, the concentration of chlorine in the water can be controlled within the range that the fish can bear, the fish is not stressed, the water is changed in small amount and many times, the problem that the water changing needs to be stressed for a long time is solved. BRIEF DESCRIPTION OF DRAWINGS

[0017] The utility model will be described in further detail below in combination with the drawings and the preferred embodiments, but the person skilled in the art will appreciate that these drawings are only drawn for the purpose of explaining the preferred embodiments and thus should not be regarded as the limitation to the scope of the utility model, in addition, the drawings only schematically show the composition or structure of the described object conceptually and can contain exaggerated display, and the drawings are not necessarily drawn to scale unless specifically indicated.

[0018] Figure 1 It is the preferred embodiment stereoscopic structure schematic drawing of the utility model;

[0019] Figure 2 It is the preferred embodiment overhead view of the utility model;

[0020] Figure 3 It is the preferred embodiment A-A sectional view of the utility model;

[0021] Figure 4 It is the preferred embodiment B-B sectional view of the utility model;

[0022] Figure 5The utility model discloses a three-dimensional structure schematic diagram of the detachable support and bottom filter cylinder rear side wall of preferred embodiment.

[0023] In the drawing: 1, support; 2, bottom filter cylinder; 21, filter bin; 211, fish excrement separation chamber; 2111, water inlet chamber; 2112, fish excrement filter chamber; 2113, fish excrement collection chamber; 2114, fish excrement filter barrel; 212, drip flow filter chamber; 2121, drip flow filter material box; 2122, guide plate; 2123, guide hole; 213, top overflow port; 22, water pump bin; 221, main cylinder water pump; 222, auxiliary cylinder water pump; 223, water culture box water pump; 3, main cylinder; 31, fish breeding area; 32, sedimentation area; 33, fish comb opening; 34, water guide area; 4, first downcomer; 41, first downcomer one; 42, first downcomer two; 5, first upcomer; 6, automatic water replenishing cylinder; 61, clean water tank; 62, waste water tank; 7, first pipeline; 71, first water inlet; 72, first water outlet; 73, flow control valve; 74, first float ball valve; 8, second pipeline; 81, second water inlet; 82, second water outlet; 83, second float ball valve; 9, drain pipe; 91, first valve; 10, blowdown pipeline; 101, third valve; 11, auxiliary cylinder; 12, second upcomer; 13, second downcomer; 14, flushing pipe; 141, second valve; 15, water culture box; 16, third downcomer; 17, third upcomer; 18, fourth valve. DETAILED DESCRIPTION

[0024] The preferred embodiments of the utility model will be described in detail below with reference to the drawings, and those skilled in the art will appreciate that these descriptions are only descriptive, exemplary, and should not be interpreted as limiting the protection scope of the utility model.

[0025] It should be noted that: similar signs represent similar items in the following drawings, so once an item is defined in one drawing, it can not be further defined and explained in the subsequent drawings.

[0026] The embodiment mainly describes a fish tank with an automatic water replenishing device, and specifically as follows:

[0027] As Figures 1 to 5As shown, a fish tank with automatic water replenishing device, including support 1, support 1 bottom is equipped with bottom filter tank 2, support 1 top is equipped with main tank 3, main tank 3 is mainly used for breeding fish population, bottom filter tank 2 is equipped with filter device, mainly used for filtering excrement, food residue etc. of fish population in main tank 3, support 1 is mainly used for supporting main tank 3 and bottom filter tank 2, main tank 3 and bottom filter tank 2 are equipped with first downcomer 4 and first upcomer 5, first downcomer 4 is used for conveying water of main tank 3 to bottom filter tank 2 for filtering, first upcomer 5 is connected with main tank water pump 221, main tank water pump 221 can convey water filtered by bottom tank to main tank 3 through first upcomer 5, support 1 side is also equipped with automatic water replenishing tank 6, automatic water replenishing tank 6 is used for water changing and replenishing of main tank 3 and bottom filter tank 2, automatic water replenishing tank 6 includes water purification tank 61 and waste water tank 62, water purification tank 61 is connected with water source and is arranged above waste water tank 62, water level of main tank 3 is higher than that of waste water tank 62, first pipeline 7 is arranged between main tank 3 and waste water tank 62 to make them communicate, water level of main tank 3 is higher than that of waste water tank 62, which is designed to utilize siphon principle to convey water in main tank 3 to waste water tank 62 through first pipeline 7, flow control valve 73 is arranged on first pipeline 7, first float ball valve 74 is arranged in waste water tank 62 to control water outlet of first pipeline 7, water level of water purification tank 61 is higher than that of bottom filter tank 2, second pipeline 8 is arranged between water purification tank 61 and bottom filter tank 2 to make them communicate, water level of water purification tank 61 is higher than that of bottom filter tank 2, which is designed to utilize siphon principle to convey water in water purification tank 61 to bottom filter tank 2 through second pipeline 8, second float ball valve 83 is arranged in bottom filter tank 2 to control water outlet of second pipeline 8. Under normal circumstances, water in main tank 3 enters bottom filter tank 2 for filtering through first downcomer 4, filtered water is conveyed to main tank 3 through first upcomer 5 under the action of main tank water pump 221, and the process is repeated in sequence, when water in main tank 3 and bottom filter tank 2 needs to be changed, flow control valve 73 is opened, the flow of first pipeline 7 is controlled through flow control valve 73, water in main tank 3 enters waste water tank 62 through first pipeline 7, water in bottom filter tank 2 is continuously conveyed to main tank 3 through first upcomer 5 by main tank water pump 221, because part of water in main tank 3 enters waste water tank 62, the water level in bottom filter tank 2 is lowered, so that second float ball valve 83 is opened, water in water purification tank 61 enters bottom filter tank 2 through second pipeline 8, the more water main tank 3 discharges to waste water tank 62, the more water water purification tank 61 enters to bottom filter tank 2; when the water level of waste water tank 62 reaches the height of first float ball valve 74, first float ball valve 74 is closed, main tank 3 stops discharging water to waste water tank 62, at this time, the water level of bottom filter tank 2 always reaches the height at which first float ball valve 74 is closed, water purification tank 61 stops discharging water to bottom filter tank 2. The speed and amount of water discharged through first pipeline 7 are controlled by adjusting flow control valve 73, so that the speed and amount of water discharged by water purification tank 61 to bottom filter tank 2 are controlled, the concentration of chlorine in water can be controlled within the range that fish can bear, and the water does not need to be changed frequently, the amount of water changed is small, and the stimulation of new water to fish is reduced.Meanwhile, during the use of the main cylinder 3, some water will evaporate. After the water in the main cylinder 3 evaporates, the water in the bottom filter tank 2 will be replenished to the main cylinder 3 by the action of the main cylinder water pump 221. The water level in the bottom filter tank 2 will drop, causing the second float valve 83 to control the opening of the first pipe 7. The water in the clean water tank 61 will be replenished into the bottom filter tank 2 through the first pipe 7.

[0028] Specifically, when the water level in the wastewater tank 62 reaches the preset level, the first float valve 74 closes, the first pipe 7 cannot drain the water in the main cylinder 3 into the wastewater inlet, and the clean water inlet cannot enter the bottom filter cylinder 2, so the water exchange cannot be completed. The bottom of the wastewater tank 62 is equipped with a drain pipe 9. At this time, the water in the wastewater tank 62 must be drained in order for the wastewater tank 62 and the clean water tank 61 to work. In order to facilitate the drainage of the wastewater in the wastewater tank 62, one end of the drain pipe 9 passes through the bottom wall of the wastewater tank 62 and is connected to the wastewater tank 62, and the other end is located outside the wastewater tank 62. The end located outside the wastewater tank 62 is equipped with a first valve 91 for opening or closing the drain pipe 9. When the first valve 91 is opened, the wastewater can be discharged from the drain pipe 9.

[0029] like Figures 2 to 5 As shown, the main tank 3 includes a fish-raising area 31 and a sedimentation area 32. A fish comb 33 connects the sedimentation area 32 and the fish-raising area 31 at their bottoms. The fish comb 33 is designed to intercept fish during drainage. The first pipe 7 has a first inlet 71 and a first outlet 72. The first inlet 71 is located at the bottom of the sedimentation area 32, and the first outlet 72 is located inside the wastewater tank 62. A first float valve 74 is fixed to the upper side of the wastewater tank 62 and connected to the first pipe 7 to control the opening and closing of the first outlet 72. In use, water in the main tank 3 flows into the sedimentation area 32 through the fish comb 33. When the flow control valve 73 is open, water in the sedimentation area 32 enters the first pipe 7 through the first inlet 71 and flows into the wastewater tank 62 from the first outlet 72. The first inlet 71, located at the bottom of the sedimentation area 32, facilitates the discharge of fecal residue from the bottom of the sedimentation area 32 into the wastewater tank 62.

[0030] Specifically, a water guiding zone 34 is provided within the sedimentation zone 32. The top of the water guiding zone 34 is lower than the top of the sedimentation zone 32, allowing water from the sedimentation zone 32 to overflow the top of the water guiding zone 34 and enter the water guiding zone 34. The upper end of the first drain pipe 4 is located within the water guiding zone 34. The water guiding zone 34 is designed so that water first rises from the bottom of the sedimentation zone 32 before entering the water guiding zone 34, allowing fecal residue in the water to settle upon entering the sedimentation zone 32. The settled fecal residue can be discharged with the water through the first pipe 7 into the wastewater tank 62, achieving preliminary cleaning of fecal residue in the main tank 3. Fecal residue that does not settle in the sedimentation zone 32 can enter the bottom filter tank 2 through the first drain pipe 4 for further filtration.

[0031] likeFigure 2 and Figure 4 As shown in the figure, the bottom filter cylinder 2 comprises a bottom interconnected filter chamber 21 and a water pump chamber 22, the filter chamber 21 is provided with a filter device for filtering water, the lower end of the first downpipe 4 is located in the filter chamber 21, and the main cylinder water pump 221 is arranged in the water pump chamber 22. The second pipeline 8 has a second water inlet 81 and a second water outlet 82, the second water inlet 81 is arranged at the bottom of the clean water tank 61, the second water outlet 82 is arranged in the water pump area, the second float ball valve 83 is connected with the second pipeline 8 and controls the opening or closing of the second water outlet 82, the second float ball valve 83 is located at the middle upper side of the bottom filter cylinder 2, when the water level in the water pump chamber 22 reaches the preset height, the second float ball valve 83 controls the second water outlet 82 to be in the closed state, when the water level in the water pump chamber 22 is lower than the preset height, the second float ball valve 83 controls the second water outlet 82 to be in the open state. The second water inlet 81 arranged at the bottom of the clean water tank 61 can avoid the situation that when the water level in the clean water tank 61 is lower than the second water inlet 81, water cannot enter the bottom filter cylinder 2 from the second pipeline 8, and the water changing work cannot be completed.

[0032] Specifically, the filter chamber 21 comprises a fish waste separation chamber 211 and a drip flow filter chamber 212, the fish waste separation chamber 211 is used for separating fish waste and residues in the water body from water, the fish waste separation chamber 211 is sequentially provided with a water inlet chamber 2111, a fish waste filter chamber 2112 and a fish waste collection chamber 2113 from top to bottom, the fish waste filter chamber 2112 is provided with a fish waste filter barrel 2114 with an upper end extending into the water inlet chamber 2111 and a lower end extending into the fish waste collection chamber 2113, the fish waste filter barrel 2114 has an upper and lower communication opening, the lower end of the first downpipe 4 is located in the water inlet chamber 2111, the side wall of the fish waste filter barrel 2114 is provided with a plurality of filter holes, and the fish waste collection chamber 2113 has a top overflow port 213 communicating with the drip flow filter area. When the water in the water guide area 34 enters the water inlet chamber 2111 through the first downpipe 4, and then flows into the fish waste filter barrel 2114 from the upper opening of the fish waste filter barrel 2114, under the secondary filtration of the fish waste filter barrel 2114, the water enters the fish waste filter chamber 2112 from the filter holes of the fish waste filter barrel 2114, and then further filters through the top overflow port 213 into the drip flow filter material chamber, the fish waste and residues enter the fish waste collection chamber 2113 from the lower opening of the fish waste filter barrel 2114, and the fish waste separation chamber 211 can further separate the fish waste and residues in the water body, thereby further improving the quality of the water body.

[0033] Specifically, in order to further improve the water quality of the water body, a plurality of stacked drop flow filter box 2121 is arranged in the drop flow filter chamber 212, the flow filter box can increase the oxygen content in the water, filter impurities and harmful substances, and improve the cleanliness and transparency of the water quality, in order to improve the flow of the water flowing through the flow filter chamber and the water pump chamber 22, avoid the slow flow of the water at the bottom of the drop flow filter chamber 212 to form a dead water area, the lowermost drop flow filter box 2121 is spaced from the bottom wall of the drop flow filter chamber 212, in order to improve the filtering effect, the top of the uppermost drop flow filter box 2121 is provided with a flow guide plate 2122, a plurality of flow guide holes 2123 are arranged on the flow guide plate 2122, and the flow guide plate 2122 is used to disperse the water body to the surrounding, reduce the filtering pressure of the local drop flow filter.

[0034] Specifically, the first upper water pipe 5 in the water pump chamber 22 is provided with an L-shaped washing pipe 14 which is communicated with the first upper water pipe 5 and is perpendicular to the first upper water pipe 5, the washing pipe 14 is provided with a second valve 141 which controls the opening and closing of the washing pipe 14, when the second valve 141 is closed, the main cylinder water pump 221 pumps the water in the water pump chamber 22 to the main cylinder 3 through the first upper water pipe 5, when the second valve 141 is opened, the main cylinder water pump 221 pumps the water in the water pump chamber 22 to the washing pipe 14 to clean the bottom of the water pump chamber 22 and the drop flow filter chamber, in order to facilitate the discharge of the sewage collected in the fish excrement collecting chamber 2113 and the fish excrement and residue, the fish excrement collecting chamber 2113, the drop flow filter chamber 212 and the lower side of the water pump chamber are respectively provided with a sewage discharge pipe 10 which extends out of them, and the three sewage discharge pipes 10 are respectively provided with a third valve 101.

[0035] Specifically, in order to fully utilize the space utilization rate between the main cylinder 3 and the bottom filter cylinder 2, so that more kinds of fish can be raised in the fish tank, a sub-cylinder 11 is arranged between the main cylinder 3 and the bottom cylinder, a second lower water pipe 13 which communicates the drop flow filter chamber 212 and the sub-cylinder 11 is arranged between the drop flow filter chamber 212 and the sub-cylinder 11, a second upper water pipe 12 which communicates the water pump chamber 22 and the sub-cylinder 11 is arranged between the water pump chamber 22 and the sub-cylinder 11, and the second upper water pipe 12 is connected with a sub-cylinder water pump 222. The lower end of the second lower water pipe 13 is located above the drop flow filter box 2121, the second lower water pipe 13 is used to pump the water in the sub-cylinder 11 to the bottom filter cylinder for filtering, and the second upper water pipe 12 is used to pump the water in the water pump chamber 22 to the sub-cylinder 11.

[0036] Specifically, in order to improve the aesthetic degree of the fish tank and absorb harmful substances such as ammonia nitrogen in the fish tank, a water culture box 15 is arranged between the bottom filter cylinder 2 and the main cylinder 3, the bottom of the water culture box 15 is provided with a third lower water pipe 16 which extends above the drop flow filter box 2121, the water pump chamber 22 is provided with a third upper water pipe 17 which pumps the water in the water pump chamber 22 to above the water culture box 15, and the third upper water pipe 17 is connected with a water culture box water pump 223.

[0037] As Figure 4As shown, the first downcomer 4 includes a first downcomer one 41 and a first downcomer two 42, the upper end of the first downcomer two 42 is higher than the upper end of the first downcomer one 41 and slightly lower than the top of the water guide area 34, when the water level in the water tank reaches the top of the water guide area 34, to avoid the water in the main cylinder 3 overflowing, the first downcomer two 42 can be used as an overflow pipe to guide the water into the water inlet chamber 2111, the first downcomer one 41 is provided with a fourth valve 18, and the fourth valve 18 controls the opening or closing of the first downcomer one 41.

[0038] In the description of the present application, it should be pointed out that the terms "upper", "lower", "front", "rear", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0039] The fish tank with an automatic water replenishing device provided by the present application is described in detail above, and the principles and implementation modes of the present application are described by applying specific examples in this paper, and the above description of the embodiments is only used to help understand the present application and the core idea, and it should be pointed out that for ordinary skilled persons in the technical field, without departing from the principles of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A fish tank with an automatic water replenishment device, comprising a support frame, a bottom filter tank at the bottom of the support frame, a main tank at the top of the support frame, a first drain pipe and a first inlet pipe between the main tank and the bottom filter tank, the first drain pipe being used to transport water from the main tank to the bottom filter tank for filtration, and the first inlet pipe being connected to a main tank water pump for transporting filtered water from the bottom tank to the main tank, characterized in that: The automatic water supplementing cylinder comprises a clean water tank and a waste water tank, the clean water tank is arranged above the waste water tank, the water level of the main cylinder is higher than that of the waste water tank, a first pipeline is arranged between the main cylinder and the waste water tank to connect them, a flow control valve is arranged on the first pipeline, a first floating ball valve is arranged in the waste water tank to control water outflow of the first pipeline, the water level of the clean water tank is higher than that of the bottom filter cylinder, a second pipeline is arranged between the clean water tank and the bottom filter cylinder to connect them, and a second floating ball valve is arranged in the bottom filter cylinder to control water outflow of the second pipeline.

2. The fish tank with automatic water replenishing device according to claim 1, characterized in that: The clean water tank is connected with a water source, the bottom of the waste water tank is provided with a drain pipe, one end of the drain pipe penetrates through the bottom wall of the waste water tank and is connected with the waste water tank, and the other end of the drain pipe is located outside the waste water tank and is provided with a first valve for opening or closing the drain pipe.

3. The fish tank with automatic water replenishing device according to claim 1, wherein: The main cylinder comprises a fish breeding area and a sedimentation area, the sedimentation area is provided with a fish comb opening connected with the bottom of the fish breeding area, the first pipeline has a first water inlet and a first water outlet, the first water inlet is arranged at the bottom of the sedimentation area, the first water outlet is arranged in the waste water tank, and the first floating ball valve is fixed to the upper side of the waste water tank and connected with the first pipeline to control opening or closing of the first water outlet.

4. The fish tank with automatic water replenishing device according to claim 3, characterized in that: The sedimentation area is provided with a water guide area, the top of the water guide area is lower than the top of the sedimentation area, so that water in the sedimentation area can overflow the top of the water guide area and flow into the water guide area, and the upper end of the first drain pipe is located in the water guide area.

5. The fish tank with automatic water replenishing device according to claim 1, wherein: The bottom filter cylinder comprises a filter bin and a water pump bin which are connected with each other, the filter bin is provided with a filter device for filtering water, the lower end of the first drain pipe is located in the filter bin, and the water pump of the main cylinder is arranged in the water pump bin.

6. The fish tank with automatic water replenishing device as claimed in claim 5, wherein: The second pipeline has a second water inlet and a second water outlet, the second water inlet is arranged at the bottom of the clean water tank, the second water outlet is arranged in the water pump area, and the second floating ball valve is connected with the second pipeline and controls opening or closing of the second water outlet.

7. The fish tank with automatic water replenishing device according to claim 5, characterized in that: The filter bin comprises a fish excrement separation chamber and a drip flow filter chamber, the fish excrement separation chamber is sequentially provided with a water inlet chamber, a fish excrement filter chamber and a fish excrement collection chamber from top to bottom, the fish excrement filter chamber is provided with a fish excrement filter barrel with an upper end extending into the water inlet chamber and a lower end extending into the fish excrement collection chamber, the fish excrement filter barrel has an opening connected with the upper and lower chambers, the lower end of the first drain pipe is located in the water inlet chamber, the side wall of the fish excrement filter barrel is provided with a plurality of filter holes, and the fish excrement collection chamber has a top overflow port connected with the drip flow filter area.

8. The fish tank with automatic water replenishing device according to claim 7, characterized in that: The drip flow filter chamber is provided with a plurality of stacked drip flow filter box, the lowermost drip flow filter box has a spacing with the bottom wall of the drip flow filter chamber, the top of the uppermost drip flow filter box is provided with a flow guide plate, and the flow guide plate is provided with a plurality of flow guide holes.

9. The fish tank with automatic water replenishing device according to claim 7, characterized in that: An L-shaped flushing pipe is arranged on the first water inlet pipe in the water pump bin and is connected with the first water inlet pipe and perpendicular to the first water inlet pipe, a second valve is arranged on the flushing pipe to control opening or closing of the flushing pipe, the fish excrement collection chamber, the drip flow filter chamber and the lower side of the water pump area are respectively provided with a sewage discharge pipeline extending out of them, and a third valve is arranged on each of the three sewage discharge pipelines.

10. The fish tank with automatic water replenishing device according to claim 1, wherein: The main cylinder and the bottom cylinder are further provided with a sub-cylinder, the sub-cylinder and the water pump chamber are provided with a second upper water pipe for connecting the two, the second upper water pipe is connected with a sub-cylinder water pump, and the sub-cylinder and the drip filtering chamber are provided with a second lower water pipe for connecting the two.

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