Liquid level meter assembly, breeding tank and closed fishery breeding system

Abstract

The utility model discloses a liquidometer assembly, a breeding tank and a closed fishery breeding system, and relates to the technical field of fishery breeding, the liquidometer assembly is used for the breeding tank, the breeding tank comprises a tank body, and the liquidometer assembly comprises a liquidometer body, a first connecting pipe, a second connecting pipe and an air conveying pipe. The first connecting pipe is connected to the top end of the liquid level meter body and used for being connected with a tank body, the second connecting pipe is connected to the bottom end of the liquid level meter body and used for being connected with the tank body, and the gas conveying pipe is connected to the first connecting pipe. According to the liquid level meter assembly, the breeding tank and the closed fishery breeding system, the breeding tank is easier to assemble, the tank body of the breeding tank is more convenient to machine, and in addition, the sealing performance of the tank body of the breeding tank is better.

Description

Technical Field

[0001] The utility model relates to the technical field of fishery breeding, in particular to a liquid level meter component, a breeding tank and a closed fishery breeding system. Background Art

[0002] Aquaculture tanks are crucial components of closed aquaculture systems. They are equipped with a feeding port, a water inlet pipe, an air pipe, and a liquid level gauge. The feeding port and water inlet pipe deliver feed and water, respectively. The air pipe is used to deliver gas to regulate the pressure within the tank to the desired level for fish and other aquatic products. The liquid level gauge is used to monitor the liquid level within the tank. Existing aquaculture tanks require separate connections between the air pipe and liquid level gauge, making assembly cumbersome and requiring multiple connection holes to be machined. This complexity, coupled with the large number of holes, can lead to sealing issues. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a liquid level gauge assembly that not only simplifies the assembly of aquaculture tanks, but also makes the tank body of the aquaculture tanks more convenient to process and further improves the sealing performance of the aquaculture tank body.

[0004] The utility model also provides a breeding tank with the liquid level gauge assembly.

[0005] The utility model also provides a closed fishery breeding system with the breeding tank.

[0006] According to the liquid level gauge assembly of the first aspect embodiment of the present utility model, it is used for a breeding tank, the breeding tank includes a tank body, the liquid level gauge assembly includes a liquid level gauge body, a first connecting pipe, a second connecting pipe and an air pipe, the first connecting pipe is connected to the top of the liquid level gauge body, the first connecting pipe is used to connect to the tank body, the second connecting pipe is connected to the bottom end of the liquid level gauge body, the second connecting pipe is used to connect to the tank body, and the air pipe is connected to the first connecting pipe.

[0007] The liquid level gauge assembly according to the embodiment of the utility model has at least the following beneficial effects:

[0008] In the present invention, the tank body of the aquaculture tank can be processed with two connecting holes corresponding to the liquid level gauge assembly, one of which is close to the top of the tank body, and the other is close to the bottom of the tank body. The liquid level gauge assembly of the present invention can be processed in a factory. When assembling the aquaculture tank, one end of the first connecting pipe is connected to the top of the tank body, and is communicated with the inner cavity of the tank body through the connecting hole at the top of the tank body. One end of the second connecting pipe is connected to the bottom of the tank body, and is communicated with the inner cavity of the tank body through the connecting hole at the bottom of the tank body. There is no need to connect the gas pipe to the tank body, which makes assembly more convenient. In addition, the tank body does not need to be processed with a connecting hole for connecting the gas pipe, which makes processing the tank body more convenient. In addition, the number of connecting holes on the tank body is reduced, making the tank body more sealed.

[0009] According to some embodiments of the present invention, the liquid level meter assembly further includes a sampling tube, the sampling tube is connected to the second connecting tube, and the sampling tube is provided with a first valve.

[0010] According to some embodiments of the present invention, the first connecting pipe is provided with a pressure sensor for detecting the air pressure in the tank body, and the gas supply pipe is provided with a second valve, which opens or closes the gas supply pipe according to the air pressure value detected by the pressure sensor.

[0011] According to some embodiments of the present invention, the second connecting pipe is provided with a pressure gauge for detecting the water pressure in the tank.

[0012] According to some embodiments of the present invention, a third valve is provided between the liquid level gauge body and the first connecting pipe, and the third valve controls the connection and disconnection between the liquid level gauge body and the first connecting pipe.

[0013] According to some embodiments of the present invention, a fourth valve is provided between the liquid level gauge body and the second connecting pipe, and the fourth valve controls the connection and disconnection between the liquid level gauge body and the second connecting pipe.

[0014] The breeding tank according to the second embodiment of the present invention comprises a tank body and the liquid level gauge assembly described in the first embodiment, wherein the liquid level gauge assembly is arranged on the tank body.

[0015] The aquaculture tank according to the embodiment of the present invention has at least the following beneficial effects:

[0016] The breeding tank adopts the liquid level gauge assembly of the first embodiment of the present invention, which does not require the additional connection of the gas pipe to the tank body, making assembly more convenient. Moreover, the tank body does not need to be processed with a connection hole for connecting the gas pipe, making the tank body processing more convenient. In addition, the number of connection holes on the tank body is reduced, making the tank body more sealed.

[0017] According to some embodiments of the present invention, the breeding tank also includes a sewage discharge assembly, which includes a sewage collecting cylinder and a sewage discharge pipe. The sewage collecting cylinder is arranged at the bottom end of the tank body, and the top end of the sewage collecting cylinder is connected to the inner cavity of the tank body and is provided with a filter screen. The sewage discharge pipe is connected to the sewage collecting cylinder.

[0018] According to some embodiments of the present invention, the sewage discharge assembly also includes a filter tube, which is arranged in the tank body, the top end of the filter tube extends to the top end of the tank body, the bottom end of the filter tube is connected to the sewage collecting cylinder, and the top end of the side wall of the filter tube is provided with a plurality of first filter holes, and the bottom end of the side wall of the filter tube is provided with a plurality of second filter holes.

[0019] The closed fishery breeding system according to the third embodiment of the present invention includes the breeding tank described in the second embodiment.

[0020] The closed fish farming system according to the embodiment of the present invention has at least the following beneficial effects:

[0021] The closed fishery breeding system adopts the breeding tank of the second embodiment of the present invention, and the breeding tank adopts the liquid level gauge assembly of the first embodiment of the present invention. There is no need to connect the gas pipe to the tank body, which makes assembly more convenient. Moreover, the tank body does not need to be processed with a connection hole for connecting the gas pipe, which makes the tank body processing more convenient. In addition, the number of connection holes on the tank body is reduced, making the tank body more sealed.

[0022] Additional aspects and advantages of the present invention will be partially given in the following description, and some advantages will become apparent from the following description or be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 This is a structural diagram of a breeding tank according to an embodiment of the present utility model;

[0025] Figure 2 This is the installation diagram of the liquid level gauge assembly;

[0026] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0027] Figure 4 for Figure 1 Enlarged view of point B in the middle;

[0028] Figure 5 This is a schematic diagram of the installation of the sewage discharge component.

[0029] Figure Number:

[0030] Liquid level gauge assembly 100; liquid level gauge body 101; first connecting pipe 102; second connecting pipe 103; gas pipe 104; sampling pipe 105; first valve 106; pressure sensor 107; second valve 108; pressure gauge 109; third valve 110; fourth valve 111;

[0031] Tank 200;

[0032] Sewage discharge assembly 300; sewage collecting cylinder 301; filter screen 302; sewage discharge pipe 303; filter pipe 304; first filter hole 305; second filter hole 306. DETAILED DESCRIPTION

[0033] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0034] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientation or positional relationship indicated by up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In the description of this utility model, "a plurality" refers to two or more. The use of "first" or "second" is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0036] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0037] Reference below Figures 1 to 5 The present invention describes a liquid level gauge assembly, a culture tank, and a closed fishery culture system according to embodiments of the present invention.

[0038] refer to Figures 1 to 4 As shown, the liquid level gauge assembly 100 according to the embodiment of the first aspect of the present invention is used for aquaculture tanks, which include a tank body 200 , and the liquid level gauge assembly 100 includes a liquid level gauge body 101 , a first connecting pipe 102 , a second connecting pipe 103 and an air pipe 104 .

[0039] Among them, the liquid level gauge body 101 can be set vertically, the liquid level gauge body 101 can be a circular tube structure, the liquid level gauge body 101 can be made of transparent material, for example, transparent glass or transparent plastic, the liquid level gauge body 101 can be provided with multiple scale lines, and the multiple scale lines can be evenly arranged along the length direction of the liquid level gauge body 101. The scale lines are set to facilitate the staff to accurately observe the liquid level height of the water in the tank body 200.

[0040] The first connecting tube 102 is connected to the top of the liquid level gauge body 101, and the first connecting tube 102 is used to connect to the tank body 200. For example, the top of the liquid level gauge body 101 can be connected to one end of the first connecting tube 102, and the other end of the first connecting tube 102 can be welded to the top of the tank body 200 or connected by other suitable means. The top of the tank body 200 can be provided with a connecting hole corresponding to the first connecting tube 102, and the first connecting tube 102 is connected to the inner cavity of the tank body 200 through the connecting hole.

[0041] The second connecting tube 103 is connected to the bottom end of the liquid level gauge body 101 and is used to connect to the tank body 200. For example, the bottom end of the liquid level gauge body 101 can be connected to one end of the second connecting tube 103, and the other end of the second connecting tube 103 can be welded to the bottom end of the tank body 200 or connected by other suitable means. The bottom end of the tank body 200 can be provided with a connecting hole corresponding to the second connecting tube 103, and the second connecting tube 103 is connected to the inner cavity of the tank body 200 through the connecting hole. Since the bottom end of the inner cavity of the tank body 200 is a liquid space and the top end of the inner cavity of the tank body 200 is a gas space, the bottom end of the liquid level gauge body 101 is connected to the liquid space at the bottom end of the inner cavity of the tank body 200, and the top end of the liquid level gauge body 101 is connected to the gas space at the top end of the inner cavity of the tank body 200, thereby achieving liquid level observation.

[0042] The air supply pipe 104 is connected to the first connecting pipe 102 , and one end of the air supply pipe 104 away from the first connecting pipe 102 can be used to connect to an air supply device such as an air compressor.

[0043] In the present invention, the tank body 200 of the aquaculture tank can be processed with two connecting holes corresponding to the liquid level gauge assembly 100, one of which is close to the top of the tank body 200 and the other is close to the bottom of the tank body 200. The liquid level gauge assembly 100 of the present invention can be processed in a factory. When assembling the aquaculture tank, one end of the first connecting pipe 102 is connected to the top of the tank body 200 and communicates with the inner cavity of the tank body 200 through the connecting hole at the top of the tank body 200. One end of the second connecting pipe 103 is connected to the bottom of the tank body 200 and communicates with the inner cavity of the tank body 200 through the connecting hole at the bottom of the tank body 200. There is no need to connect the gas pipe 104 to the tank body 200, which makes assembly more convenient. Moreover, the tank body 200 does not need to be processed with a connecting hole for connecting the gas pipe 104, which makes the tank body 200 more convenient to process. In addition, the number of connecting holes on the tank body 200 is reduced, making the sealing of the tank body 200 better.

[0044] It should be noted that the tank body 200 can be provided with a pressure balancing valve. When the air pressure in the tank body 200 is greater than a preset value, the pressure balancing valve opens and the gas in the tank body 200 can be discharged through the pressure balancing valve. Of course, the gas pipe 104 can also be set to be able to both take in and exhaust air.

[0045] refer to Figure 2 and Figure 4 As shown, in some embodiments of the present invention, the liquid level gauge assembly 100 further includes a sampling tube 105, which is connected to the second connecting tube 103 and is provided with a first valve 106. For example, the sampling tube 105 can be connected to the bottom of the second connecting tube 103, the sampling tube 105 can extend downward, and the first valve 106 can be a manual valve or an automatic valve.

[0046] In this embodiment, during the aquaculture process, the first valve 106 closes the sampling tube 105 to prevent the water in the tank body 200 from flowing out of the sampling tube 105. When it is necessary to detect whether the water in the tank body 200 meets the aquaculture requirements, the first valve 106 can be opened to take out a small amount of water from the sampling tube 105 for testing. The operation is simple and convenient, saving time and effort. In addition, the sampling tube 105 is arranged on the second connecting tube 103, which not only facilitates the outflow of water in the tank body 200, but also eliminates the need to connect the sampling tube 105 to the tank body 200 when assembling the aquaculture tank, making assembly more convenient. There is no need to additionally machine a connection hole on the tank body 200 for connecting the sampling tube 105, making the tank body 200 more convenient to process. In addition, the reduction in the number of connection holes on the tank body 200 also makes the tank body 200 more sealed.

[0047] refer to Figure 2 and Figure 3As shown, in some embodiments of the present invention, the first connecting pipe 102 is provided with a pressure sensor 107 for detecting the air pressure in the tank body 200, and the gas pipe 104 is provided with a second valve 108, which opens or closes the gas pipe 104 according to the air pressure value detected by the pressure sensor 107. For example, the second valve 108 can be a solenoid valve, and the pressure sensor 107 and the second valve 108 can both be connected to the control box of the closed fishery breeding system. When the pressure sensor 107 detects that the air pressure in the tank body 200 is less than a preset value, it sends a signal to the controller on the control box. The controller controls the second valve 108 to open the gas pipe 104, and the gas pipe 104 can replenish air into the tank body 200 in time, so that the air pressure in the tank body 200 meets the pressure required by the aquatic products. When the air pressure in the tank body 200 rises to the required air pressure, the pressure sensor 107 senses and sends a signal to the controller on the control box. The controller controls the second valve 108 to close the gas pipe 104 and stop the air intake. It has a high degree of automation, is more convenient to use, and the air pressure regulation is more precise, which is more conducive to the growth of aquatic products.

[0048] refer to Figure 2 and Figure 4 As shown, in some embodiments of the present invention, the second connecting pipe 103 is provided with a pressure gauge 109 for detecting the water pressure in the tank body 200. The provision of the pressure gauge 109 facilitates the staff to promptly and intuitively understand the water pressure in the tank body 200, thereby enabling timely adjustment to the desired pressure, which is more conducive to the growth of aquatic products.

[0049] refer to Figure 2 and Figure 3 As shown, in some embodiments of the present invention, a third valve 110 is provided between the liquid level gauge body 101 and the first connecting pipe 102. The third valve 110 controls the connection and disconnection between the liquid level gauge body 101 and the first connecting pipe 102. When the liquid level gauge body 101 is intact, the third valve 110 is operated to connect the liquid level gauge body 101 with the first connecting pipe 102, thereby connecting the liquid level gauge body 101 to the inner cavity of the tank body 200, so that the liquid level height in the tank body 200 can be observed through the liquid level gauge body 101. When the liquid level gauge body 101 is damaged, such as cracks, the third valve 110 is operated to disconnect the liquid level gauge body 101 from the first connecting pipe 102, thereby preventing the gas in the tank body 200 from escaping through the cracks in the liquid level gauge body 101 and reducing the air pressure in the tank body 200, thereby affecting the growth of aquatic products in the tank body 200.

[0050] refer to Figure 2 and Figure 4As shown, in some embodiments of the present invention, a fourth valve 111 is provided between the liquid level gauge body 101 and the second connecting pipe 103. The fourth valve 111 controls the connection and disconnection between the liquid level gauge body 101 and the second connecting pipe 103. When the liquid level gauge body 101 is intact, the fourth valve 111 is operated to connect the liquid level gauge body 101 with the second connecting pipe 103, thereby connecting the liquid level gauge body 101 to the inner cavity of the tank body 200, so that the liquid level height in the tank body 200 can be observed through the liquid level gauge body 101. When the liquid level gauge body 101 is damaged, such as cracks, the fourth valve 111 is operated to disconnect the liquid level gauge body 101 from the second connecting pipe 103, thereby preventing water in the tank body 200 from flowing out through the cracks in the liquid level gauge body 101, thereby affecting the growth of aquatic products in the tank body 200, causing water waste, and affecting the external environment.

[0051] According to the second embodiment of the present invention, the breeding tank is Figure 1 and Figure 2 As shown, the tank body 200 and the liquid level gauge assembly 100 according to the first embodiment are included, and the liquid level gauge assembly 100 is installed on the tank body 200. For example, the tank body 200 can be processed with two connecting holes corresponding to the liquid level gauge assembly 100, one of which is close to the top end of the tank body 200 and the other is close to the bottom end of the tank body 200. One end of the first connecting pipe 102 is connected to the top end of the tank body 200 and communicates with the inner cavity of the tank body 200 through the connecting hole at the top end of the tank body 200. One end of the second connecting pipe 103 is connected to the bottom end of the tank body 200 and communicates with the inner cavity of the tank body 200 through the connecting hole at the bottom end of the tank body 200.

[0052] In this embodiment, the breeding tank adopts the liquid level gauge assembly 100 of the first embodiment of the present utility model, and there is no need to additionally connect the gas pipe 104 to the tank body 200, so the assembly is more convenient, and the tank body 200 does not need to be processed with a connection hole for connecting the gas pipe 104, so the tank body 200 is more convenient to process. In addition, the number of connection holes on the tank body 200 is reduced, so that the sealing performance of the tank body 200 is better.

[0053] It should be noted that the breeding tank can be used not only for aquatic products, but also for breeding other aquatic species, which will not be elaborated here.

[0054] It should be noted that, since the aquaculture tank can adopt all the technical solutions of the liquid level gauge assembly 100 of the first embodiment mentioned above, it at least has all the beneficial effects brought by the technical solutions of the first embodiment mentioned above. These additional beneficial effects will not be repeated here.

[0055] It is understandable that the tank body 200 may also be provided with a water inlet pipe, a feeding tube and other components. The other structures and operations of the breeding tank according to the embodiment of the utility model are known to ordinary technicians in this field and will not be described in detail here.

[0056] refer to Figure 5 As shown, in some embodiments of the present invention, the aquaculture tank further includes a sewage discharge assembly 300, which includes a sewage collecting cylinder 301 and a sewage discharge pipe 303. The sewage collecting cylinder 301 is disposed at the bottom end of the tank body 200. The top end of the sewage collecting cylinder 301 communicates with the inner cavity of the tank body 200 and is provided with a filter screen 302. The sewage discharge pipe 303 is connected to the sewage collecting cylinder 301. For example, the top end of the sewage collecting cylinder 301 can be provided through, and the filter screen 302 is provided at the top end of the sewage collecting cylinder 301. The pore size of the filter screen 302 is larger than the size of the excrement and feed residue of the aquatic product, but smaller than the size of the aquatic product.

[0057] In this embodiment, during the aquaculture process, aquatic excrement and feed residue can enter the sewage collection barrel 301 through the filter holes of the filter screen 302 and then be discharged through the sewage pipe 303. This improves the sewage discharge effect and is more conducive to the growth of aquatic products. The installation of the filter screen 302 can prevent aquatic products from escaping through the sewage pipe 303 and causing economic losses.

[0058] It should be noted that the top of the sewage collecting cylinder 301 can extend into the tank body 200, or the bottom of the tank body 200 can be provided with a sewage outlet, and the top of the sewage collecting cylinder 301 is connected to the sewage outlet.

[0059] refer to Figure 5 As shown, in some embodiments of the present invention, the sewage discharge assembly 300 further includes a filter tube 304. The filter tube 304 can be vertically disposed within the tank body 200. The top end of the filter tube 304 can extend to the top end of the tank body 200. The top end of the filter tube 304 can be closed. The bottom end of the filter tube 304 is connected to the sewage collection barrel 301. The top end of the side wall of the filter tube 304 is provided with a plurality of first filter holes 305, and the bottom end of the side wall of the filter tube 304 is provided with a plurality of second filter holes 306. For example, the bottom end of the filter tube 304 can be provided through and extend into the sewage collection barrel 301. The filter screen 302 can surround the filter tube 304 and be connected to the outer wall of the filter tube 304.

[0060] In this embodiment, a filter tube 304 is provided, and a plurality of first filter holes 305 and a plurality of second filter holes 306 are respectively provided at the top and bottom ends of the side wall of the filter tube 304. Excrement and feed residues floating at the top of the tank body 200 can enter the filter tube 304 through the first filter holes 305, and then be discharged through the sewage collecting cylinder 301 and the sewage pipe 303. Excrement and feed residues at the bottom end of the tank body 200 can enter the filter tube 304 through the second filter holes 306, and then be discharged through the sewage collecting cylinder 301 and the sewage pipe 303. In this way, the sewage discharge effect of the tank body 200 is better, and the water in the tank body 200 is cleaner, which is more conducive to the growth of aquatic products.

[0061] According to the closed fishery breeding system of the third embodiment of the present invention, it includes the breeding tank of the second embodiment.

[0062] The closed fishery farming system adopts the farming tank of the second embodiment of the present invention, and the farming tank adopts the liquid level gauge assembly 100 of the first embodiment of the present invention. There is no need to additionally connect the gas pipe 104 to the tank body 200, so the assembly is more convenient, and the tank body 200 does not need to be processed with a connection hole for connecting the gas pipe 104, so the tank body 200 is more convenient to process. In addition, the number of connection holes on the tank body 200 is reduced, thereby making the tank body 200 more sealed.

[0063] It should be noted that since the closed fishery farming system can adopt all the technical solutions of the liquid level meter assembly of the above-mentioned first embodiment, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned first embodiment. These additional beneficial effects will not be repeated here.

[0064] It can be understood that the closed fishery farming system can also include a filtering device, a biochemical device, a sterilization device, a pressurizing device, an oxygenation device and various pipelines, etc. The other components and operations of the closed fishery farming system according to the embodiment of the utility model are known to ordinary technicians in this field and will not be described in detail here.

[0065] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A liquid level gauge assembly for a breeding tank, wherein the breeding tank comprises a tank body, characterized in that: include: Liquid level gauge body; a first connecting pipe connected to the top of the liquid level meter body, the first connecting pipe being used to connect to the tank body; a second connecting pipe connected to the bottom end of the liquid level meter body, the second connecting pipe being used to connect to the tank body; The gas transmission pipe is connected to the first connecting pipe.

2. The liquid level gauge assembly according to claim 1, characterized in that: The liquid level gauge assembly further comprises: A sampling tube is connected to the second connecting tube, and the sampling tube is provided with a first valve.

3. The liquid level gauge assembly according to claim 1 or 2, characterized in that: The first connecting pipe is provided with a pressure sensor for detecting the air pressure in the tank body, and the air supply pipe is provided with a second valve, which opens or closes the air supply pipe according to the air pressure value detected by the pressure sensor.

4. The liquid level gauge assembly according to claim 1 or 2, characterized in that: The second connecting pipe is provided with a pressure gauge for detecting the water pressure in the tank.

5. The liquid level gauge assembly according to claim 1 or 2, characterized in that: A third valve is provided between the liquid level meter body and the first connecting pipe, and the third valve controls the connection and disconnection between the liquid level meter body and the first connecting pipe.

6. The liquid level gauge assembly according to claim 1 or 2, characterized in that: A fourth valve is provided between the liquid level meter body and the second connecting pipe, and the fourth valve controls the connection and disconnection between the liquid level meter body and the second connecting pipe.

7. A breeding tank, characterized in that: include: Tank; The liquid level gauge assembly according to any one of claims 1 to 6, arranged on the tank body.

8. The breeding tank according to claim 7, characterized in that: The breeding tank also includes a sewage discharge assembly, which includes: A dirt collecting cylinder is provided at the bottom end of the tank body, the top end of the dirt collecting cylinder is connected to the inner cavity of the tank body and is provided with a filter screen; A sewage pipe is connected to the sewage collecting cylinder.

9. The breeding tank according to claim 8, characterized in that: The sewage discharge assembly also includes: The filter tube is arranged in the tank body, the top end of the filter tube extends to the top end of the tank body, the bottom end of the filter tube is connected to the sewage collecting cylinder, the top end of the side wall of the filter tube is provided with a plurality of first filter holes, and the bottom end of the side wall of the filter tube is provided with a plurality of second filter holes.

10. A closed fish farming system, characterized in that: The method comprises the breeding tank according to any one of claims 7 to 9.

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