Water level-adjustable water outlet device and use method thereof

Abstract

The water outlet device comprises a vertical round pipe, a water level adjusting pipe, a transverse water pipe and a U-shaped through groove, the lower portion of the vertical round pipe is connected with the transverse water pipe, water flow does not circulate between the transverse water pipe and the vertical round pipe, the pipe wall of the vertical round pipe is symmetrically provided with an overflow strip and a water outlet strip in the pipe wall direction, and the water outlet strip is communicated with the U-shaped through groove; the top end of the vertical round pipe is inserted into a water level adjusting pipe, at least one overflow opening and at least one water outlet are symmetrically formed in the pipe wall of the water level adjusting pipe, the water level adjusting pipe is rotated to enable the overflow openings to be aligned with the overflow strips, and the water outlets are aligned with the water outlet strips. Bottom dirty water and upper surface water in the breeding container a are simultaneously discharged into the U-shaped through groove and then discharged outwards through the transverse water pipe. The water outlet device capable of adjusting the water level is used in cooperation with a filtering system, the water level height of a breeding container can be adjusted in a large range, and operation is easy and fast.

Description

Technical Field

[0001] The invention relates to a water outlet device with adjustable water level and a use method thereof, belonging to the field of water-using equipment. Background Art

[0002] As the market demand for aquaculture equipment grows, water level control in aquaculture containers has become a key technical issue. Different species of organisms have different requirements for water levels. When aquatic organisms are sick, the water level needs to be lowered to reduce their activity. The water level of the aquaculture container also needs to be adjusted during routine maintenance, etc.

[0003] In the prior art, independent breeding containers cannot be well matched with filtering systems. Although the water level height can be adjusted arbitrarily, the water quality cannot be guaranteed; and breeding containers equipped with filtering systems cannot adjust the water level in the breeding containers. At present, the amount of water between the breeding containers and the filtering containers of breeding containers equipped with filtering systems can only be fixed within a certain safety range, resulting in the inability to adjust the water level height. The technical disadvantage is that when the water level of the breeding container changes, the water level of the filtering container will also change, which can easily cause the risk of dry burning of the water pump and large-scale overflow of water. The water level height of the existing breeding containers that can be used in conjunction with the filtering device is designed at the factory and does not have the function of water level adjustment. Summary of the invention

[0004] The purpose of the present invention is to provide a water outlet device with adjustable water level and a method of using the same, so as to solve the technical problem in the prior art that aquaculture containers cannot be used in conjunction with a filtration system and cannot adjust the water level of the aquaculture containers.

[0005] In order to solve the above problems, the technical solution adopted by the present invention is: a water outlet device with adjustable water level, including a vertical circular tube, a water level regulating tube, a horizontal water pipe and a U-shaped groove, the vertical circular tube is connected to the horizontal water pipe below and no water flows between the two, overflow bars and water outlet bars are symmetrically arranged along the tube wall direction on the wall of the vertical circular tube, the water outlet bar is connected to the U-shaped groove, the bottom of the U-shaped groove is connected to the horizontal water pipe, the water level regulating tube is inserted into the top of the vertical circular tube, and at least one overflow port and water outlet are symmetrically arranged on the wall of the water level regulating tube, the water level regulating tube is rotated to align the overflow port with the overflow bar, and the water outlet with the water outlet bar, so that the bottom dirty water and the upper surface water in the breeding container a are simultaneously discharged into the U-shaped groove and then discharged outward through the horizontal water pipe.

[0006] As a further improvement of the present invention, a hemispherical base is provided at the bottom of the vertical circular tube, and at least one bottom suction port is provided on the base for sucking away impurities at the bottom of the breeding container. As a further improvement of the present invention, one end of the horizontal water pipe passes through the wall of the breeding container and is threadedly connected to an external pipe, and a sealing ring is provided at the place where the breeding container wall connects the horizontal water pipe and the external pipe.

[0007] As a further improvement of the present invention, the water level regulating pipe is provided with a water outlet and an overflow on the pipe wall at different heights, the width of the water outlet is consistent with the width of the water outlet bar, the width of the overflow is consistent with the width of the overflow bar, the water outlet and the overflow at the same height are a group, the length of each group of water outlets and overflows is the same and the upper and lower heights are consistent, when the water level regulating pipe is placed vertically, any vertical plane can only pass through one group of water outlets and overflows, and after the water level regulating pipe is inserted into the vertical circular pipe, the lowest surface of the water level regulating pipe is lower than the lowest surface of the horizontal water pipe.

[0008] As a further improvement of the present invention, a water level schematic scale and a knob for facilitating the rotation of the water level regulating tube are arranged on the top surface of the water level regulating tube.

[0009] As a further improvement of the present invention, the top of the U-shaped through groove is connected to the anti-overflow outlet, and the height of the anti-overflow outlet in the breeding container is higher than the highest points of the overflow bar and the water outlet bar.

[0010] As a further improvement of the present invention, the water outlet end of the external pipe can be connected to the water outlet pipeline, and the external pipe can also discharge the water in the breeding container a into the filtering area. The filtering area can be located at the bottom, side or back of the breeding container a. The water flowing to the filtering area is lower than the lowest design water level of the breeding container a and the highest water level of the filtering area is not higher than the operating water level of the breeding container during operation. The water filtered by the filtering area is then discharged into the breeding container a from the water inlet pipeline by the circulating water pump.

[0011] The present invention also discloses a method for using a water outlet device with adjustable water level, comprising: S1: the filter area can be located at the bottom, side or back of the aquaculture container a, the waterway flowing to the filter area is lower than the lowest design water level of the aquaculture container a, and the highest water level of the filter area during operation is not higher than the operating water level of the aquaculture container;

[0012] S2: Connecting the horizontal water pipe to the external pipe can discharge water or enter the filtration area;

[0013] S3: A vertical circular tube is arranged in the culture container a, a bottom suction port is arranged at the bottom of the vertical circular tube, a water outlet bar and an overflow bar are arranged on the vertical circular tube, the water outlet bar and the overflow bar have the same height from top to bottom, the water outlet bar is connected to a U-shaped through groove, and the bottom of the U-shaped through groove is connected to a horizontal water pipe;

[0014] S4: Insert the water level regulating tube with overflow and outlet into the vertical circular tube, rotate the top knob to the required water level scale, align the overflow and outlet with the height corresponding to the water level scale with the overflow bar and the outlet bar. When the water level is higher than the lower edge of the symmetrical outlet and overflow, the water at the bottom flows through the bottom suction port and then through the outlet and the outlet bar to the U-shaped groove, and the water on the upper surface flows through the overflow and overflow bar and then through the outlet and the outlet bar to the U-shaped groove, and then is discharged from the horizontal water pipe into the external pipe and discharged from the breeding container a.

[0015] As a further improvement of the present invention, T1: when injecting water, close the drainage, open the filter water inlet, rotate the water level regulating tube to set it to the required water level height value, and when the water flow reaches the specified height during the water injection process, it will flow into the filter area, and when the water volume in the filter area reaches the operating requirement of the circulating water pump, turn on the circulating water pump. When the water level reaches the set height, the bottom water flow will be sucked in from the bottom suction port and take away the bottom impurities, while the impurities on the water surface will flow out from the overflow port. Both water flows will flow to the filter area through the outlet, and the water level is maintained and the filter is operating normally, then the water injection can be stopped;

[0016] T2: Lower the water level, open the drain, stop the water inflow to the filter area, turn off the circulating water pump, rotate the water level regulating pipe to set the required water level height value, and the excess water will flow out. When the water level drops to the specified position, the water will automatically stop flowing out;

[0017] T3: Raise the water level, turn off the circulating water pump, rotate the water level regulating tube to set it to the required water level, start water injection, and stop water injection when water flows out of the external pipe. Turn on the circulating water pump to realize water circulation filtration again.

[0018] T4: Water change maintenance, open the drain, stop water inflow to the filtration area, turn off the circulating water pump, rotate the water level regulating tube to lower the water level height value according to the water change amount, and the excess water flows out. When the water level drops to the specified position, the water automatically stops flowing out. Rotate the water level regulating tube to restore the height value before the water change, stop draining and allow water to flow into the filtration area, start water injection, stop water injection when the required water level is reached and the filtration is running normally, and turn on the circulating water pump to realize water circulation filtration again.

[0019] In the present invention, water level adjustment is achieved by combining a water level regulating pipe and a vertical circular pipe by aligning water outlets and overflow outlets at different heights. A U-shaped through groove and a bottom suction port are provided, so that the water level is adjusted and a siphon effect is achieved to suck out impurities on the water surface and the bottom of the water.

[0020] In summary, the beneficial effects of the present invention are as follows: 1. The present invention can adjust the water level of the breeding container in a wide range. After the filtration system is installed, the same container can meet the water level requirements of different aquatic organisms for different heights.

[0021] 2. The device of the present invention can fully cooperate with the operation of the filtration system. Changing the water level height does not require modifying the filtration system pipes and breeding containers, and is easy to use.

[0022] 3. The device of the present invention can achieve quantitative drainage, and there will be no accidents such as water body overflow or water pump dry burning during the water change process.

[0023] 4. The device of the present invention cooperates well with the filtering system, which can discharge fish feces at the bottom of the water, discharge floating objects on the water surface, and prevent the risk of overflow due to excessive water level caused by blockage of the water outlet.

[0024] 5. The device structure of the present invention is applicable to various breeding containers, is simple to operate and is suitable for all aquarium breeders. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the device in the present invention.

[0026] Figure 2 The present invention Figure 1 Schematic diagram of the AA cross-section structure.

[0027] Figure 3 It is a structural schematic diagram of the top of the device in the present invention.

[0028] Figure 4 It is a schematic diagram of the structure of the overflow bar and the water outlet bar in the present invention.

[0029] Figure 5 The present invention Figure 1 Schematic diagram of the GG cross-section structure.

[0030] Figure 6 It is a schematic diagram of the structure of the water level regulating pipe in the present invention.

[0031] Figure 7 It is a schematic diagram of the cross-sectional structure of four groups of water outlets and overflow outlets in the present invention.

[0032] Figure 8 It is an application schematic diagram of the device of the present invention used in conjunction with a bottom filtration system. DETAILED DESCRIPTION

[0033] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings.

[0034] Example 1

[0035] Reference Figure 1-2 This embodiment provides a water outlet device with adjustable water level and a method for using the same. The device is installed in a breeding container for use. The filter area used in conjunction with the breeding container can be located at the bottom, side or back of the breeding container a. The waterway flowing to the filter area is lower than the lowest design water level of the breeding container a and the highest water level of the filter area is not higher than the operating water level of the breeding container during operation. After the device is installed in the breeding container a, it can match the filter system and adjust the water level in the container over a wide range, that is, it can breed different types of aquatic organisms, meet the water level requirements of different aquatic organisms, and facilitate daily water maintenance.

[0036] A water outlet device with adjustable water level and a method for using the same include a vertical circular tube 1, a water level regulating tube 2 and a horizontal water tube 3. The vertical circular tube 1 is connected to the horizontal water tube 3 at its lower part. An overflow bar 13 and a water outlet bar 14 are symmetrically provided on the tube wall of the vertical circular tube 1 along the tube wall direction. The overflow bar 13 and the water outlet bar 14 are two through holes of the same length. That is, when the device is used, the highest point and the lowest point of the overflow bar 13 and the water outlet bar 14 in the breeding container a are of the same height. The highest point is the upper limit of the water level when the breeding container a is filled with water, and the lowest point is the lower limit of the water level when the breeding container a is drained.

[0037] The water outlet bar 14 is connected to the U-shaped groove. The water outlet bar 14 is used to discharge the water entering from the overflow bar 13 and the bottom suction port 12 to the horizontal water pipe 3 through the U-shaped groove 5 and discharge it from the breeding container a. The water level regulating pipe 2 is inserted into the top of the vertical circular tube 1. The outer diameter of the water level regulating pipe 2 is consistent with the inner diameter of the vertical circular tube 1, so that the water flow can only flow through the water outlet bar 14 and the overflow bar 13.

[0038] Preferably, a concentric limit ring is set on the upper part of the water level regulating tube 2, and the outer diameter of the limit ring is consistent with the outer diameter of the vertical circular tube 1. The function of the limit ring is that when the water level regulating tube 2 is fully inserted into the vertical circular tube 1, the lower surface of the limit ring is just stuck on the upper surface of the vertical circular tube 1, which plays a limiting role in the installation. After full insertion, the bottom surface of the water level regulating tube 2 is lower than the lowest point of the horizontal water pipe 3 to prevent water from flowing directly into the horizontal water pipe 3 from the bottom suction port 12.

[0039] At least one overflow port 21 and outlet port 22 are symmetrically provided on the wall of the water level regulating pipe 2. The symmetrical overflow port 21 and outlet port 22 have the same upper and lower heights. The water level regulating pipe 2 is rotated to align the overflow port 21 with the overflow bar 13. The overflow bar 13 is narrow in width and its function is to discharge floating objects in the water body of the breeding container a and prevent small fish from flowing out through the overflow bar 13. The outlet port 22 is aligned with the outlet bar 14 to discharge the water in the breeding container a.

[0040] Example 2, reference Figure 1-8 , which is the second embodiment of the present invention, and this embodiment is combined with the bottom filtration system based on the previous embodiment.

[0041] Specifically, a hemispherical base is arranged at the bottom of the vertical circular tube 1, and at least one bottom suction port 12 is provided on the base for sucking away the bottom impurities in the breeding container a. The function of the bottom suction port 12 is to suck away the bottom impurities such as fish feces in the breeding container a under the action of siphon. The bottom suction port 12 is small in size to prevent the small-sized aquatic organisms from being sucked away.

[0042] Furthermore, a water outlet bar 14 is opened on the tube wall of one side of the vertical circular tube 1 close to the horizontal water pipe 3, the water outlet bar 14 is connected to the U-shaped groove 5, the bottom of the U-shaped groove 5 is connected to the horizontal water pipe 3, the U-shaped opening of the U-shaped groove 5 is connected to the vertical circular tube 1, and the U-shaped opening is not lower than the highest point of the water outlet bar 14.

[0043] Among them, the width of the U-shaped groove 5 is relatively large and the width value is not less than the width value of the water outlet bar 14. When in use, the water sucked in by the bottom suction port 12 and the water entering the overflow bar 13 are discharged into the U-shaped groove 5, and the water in the U-shaped groove 5 is then discharged from the breeding container a through the horizontal water pipe 3.

[0044] Furthermore, one end of the transverse water pipe 3 passes through the wall of the breeding container a and is threadedly connected to the external pipe 4. A sealing ring 31 is provided at the connection between the transverse water pipe 3 and the external pipe 4 of the breeding container a wall to prevent water leakage during drainage.

[0045] Specifically, a water level schematic scale 23 and a knob 24 for facilitating the rotation of the water level regulating tube 2 are provided on the top surface of the water level regulating tube 2. The knob 24 is for the convenience of the operator to rotate the water level regulating tube 2. During the rotation, the water level is set to the desired height according to the angular position of the water level schematic scale 23.

[0046] Furthermore, the water level regulating pipe 2 is provided with a water outlet 22 and an overflow port 21 on the pipe wall at different heights. The width of the water outlet 22 is consistent with the width of the water outlet bar 14, and the width of the overflow port 21 is consistent with the width of the overflow bar 13. The water outlets 22 and the overflow ports 21 at the same height are grouped together, and the upper and lower heights of each group of water outlets 22 and overflow ports 21 are the same, such as Figure 7 When the water level regulating pipe 2 is placed vertically, any vertical plane can only pass through one set of water outlets 22 and overflow outlets 21, and no overlapping can occur.

[0047] When in use, align the overflow port 21 with the overflow bar 13 at the required water level, align the outlet port 22 with the outlet bar 14, and the water flow can only flow to the U-shaped groove 5 through the outlet port 22, the overflow port 21 and the bottom suction port 12, and then be discharged from the horizontal water pipe 3 into the external pipe 4 and discharged from the breeding container a.

[0048] Furthermore, the top plane of the U-shaped groove 5 is an anti-overflow outlet 6 of the same shape. The height of the anti-overflow outlet 6 in the breeding container a is higher than the highest points of the overflow bar 13 and the water outlet bar 14. Under normal circumstances, water cannot flow into the anti-overflow outlet 6. Only when debris blocks the overflow bar 13 or the water outlet bar 14 can water be discharged from the anti-overflow outlet 6.

[0049] The water outlet end of the external pipe 4 is connected to the water outlet pipeline, and the water can flow out or enter the filtering area. When draining, the water in the breeding container a is discharged; when filtering, the external pipe 4 discharges the water in the breeding container a into the filtering area, and the water filtered in the filtering area is then discharged into the breeding container a from the water inlet pipeline by the circulating water pump.

[0050] like Figure 8When the device is installed in the breeding container a for use, before starting the filter water pump, the water level regulating tube 2 is inserted into the vertical circular tube 1 and then rotated to set the required water level height. By observing the water level schematic scale 23, the water level regulating tube 2 is rotated to make the water outlet 22 of the required height coincide with the water outlet bar 14, and the overflow port 21 with the overflow bar 13. When it is rotated to the specified position, only one group of water outlets 22 and water outlet bar 14, and overflow port 21 with overflow bar 13 are in a coincidence state; the water level height is a few millimeters above the lower edge of the water outlet 22 at the coincidence point. The outer diameter of the water level regulating pipe 2 coincides with the inner diameter of the vertical circular pipe 1 and the lower surface of the water level regulating pipe 2 is lower than the horizontal water pipe 3. The water can only flow to the U-shaped groove 5 through the water outlet 22, the overflow port 21 and the bottom suction port 12. After the water injection process is started, when the water level is higher than the bottom suction port 12 but lower than the water outlet 22, the water can neither flow into the horizontal water pipe 3 nor into the U-shaped groove 5. At this time, the water level will continue to rise. When the water level rises to the lower edge of the water outlet 22, the water level will continue to rise by several millimeters under the action of the water body tension. At this time, the water The water body will produce a siphon effect, and the air pressure will make the water flow start to flow upward from the bottom suction port 12 and pass through the water outlet 22 and the water outlet bar 14, and then pass through the U-shaped groove 5 and the horizontal water pipe 3 to discharge from the breeding container a. At this time, if there is still water entering the breeding container a, the water exceeding the water level will flow out of the breeding container a through the bottom suction port 12 and the overflow port 21 through the water outlet 22. If there is no water entering, the water level will be fixed at this height after it drops to the lower edge of the water outlet 22, thus achieving the effect of controlling the water level. However, water pumps with different powers will cause water level changes. If the water pump has a large power and flows into a large amount of water, the water level will be higher, and if the water pump has a small power and flows into a small amount of water, the water level will be lower. The fluctuation range is about a few millimeters.

[0051] by Figure 8 The method for adjusting the water level of the aquaculture container A used in the device shown in the figure with the bottom filtration system is as follows:

[0052] 1. Start water injection

[0053] 1. Close the drain valve and open the filter water inlet valve to allow water to flow into the filter area;

[0054] 2. Rotate the water level regulating tube 2 to set the required water level height value;

[0055] 3. Start water injection. During the water injection process, the water flow will flow into the filter area after reaching the specified height. When the water volume in the filter area reaches the operating requirements of the circulating water pump, you can turn on the circulating water pump.

[0056] 4. After the circulating water pump is turned on, the water level of the breeding container a will not change, but the water level in the filter area will change. When the filter area reaches a reasonable height, water injection is stopped. At this time, the water flow forms a circulating filtration effect between the breeding container a and the filter area. The bottom suction port 12 sucks in the bottom impurities, and the impurities on the water surface flow out from the overflow port 21. Both water flows flow to the filter area through the outlet 22.

[0057] 2. Lower the water level

[0058] 1. Open the drain valve and close the filter water inlet valve to prevent the water discharged from the breeding container a from overflowing the filter area;

[0059] 2. Turn off the circulating water pump to keep the water level in the filtration area normal;

[0060] 3. Rotate the water level regulating pipe 2 to set it to the required water level height value, and the excess water will flow out. When the water level drops to the specified position, the water will automatically stop flowing out;

[0061] 4. Close the drain valve, open the filtered water inlet valve, and start the circulating water pump to realize water circulation filtration again.

[0062] 3. Raise the water level

[0063] 1. Turn off the circulating water pump to prevent the risk of dry burning of the circulating water pump due to insufficient water in the filtration area;

[0064] 2. Rotate the water level regulating tube 2 to set the required water level height value;

[0065] 3. Start to inject water, and when the water reaches the specified height and starts to flow out, stop injecting water and turn on the circulating water pump to realize water circulation filtration again.

[0066] 4. Daily water change and maintenance

[0067] 1. Open the drain valve and close the filter water inlet valve to prevent the water discharged from the breeding container a from overflowing the filter area;

[0068] 2. Turn off the circulating water pump to keep the water level in the filtration area normal;

[0069] 3. Rotate the water level regulating tube 2 to lower the water level according to the amount of water to be replaced, and the excess water will flow out. When the water level drops to the specified position, the water will automatically stop flowing out.

[0070] 4. Rotate the water level regulating tube 2 to restore the height value before water change, close the drain valve, and open the filtered water inlet valve;

[0071] 5. Start to inject water, observe that the water flow reaches the specified height and then starts to flow out, then stop injecting water and turn on the circulating water pump to achieve water circulation filtration again.

[0072] When the aquaculture container a and the filtration system are connected, there will be no overflow when there is a power outage, and it can operate normally after the power is restored, without manual intervention. If there is no water level adjustment function, the circulating water pump will inject water into the aquaculture container a, and the aquaculture container a will continue to flow to the filtration area after the power outage, but the circulating water pump will stop, which will cause water to continuously flow out of the aquaculture container a. However, if the water level of this device is lower than the water level adjustment pipe 2, it will not flow out, and it will automatically flow out when the water level is high, that is, it will not cause the water level in the aquaculture container a to be too low and will not cause the water to overflow from the aquaculture container a.

[0073] The parts not specifically described in the above description are all prior art, or can be implemented by prior art. Moreover, the specific implementation cases described in the present invention are only preferred implementation cases of the present invention, and are not used to limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made according to the content of the patent scope of the present invention should be regarded as the technical scope of the present invention.

Claims

1. A water outlet device with adjustable water level, characterized in that: The invention comprises a vertical circular tube (1), a water level regulating tube (2), a transverse water tube (3) and a U-shaped groove (5); the vertical circular tube (1) is connected to the transverse water tube (3) at the bottom and no water flows between the two; the vertical circular tube (1) is symmetrically provided with overflow strips (13) and outlet strips (14) along the tube wall; the outlet strips (14) are connected to the U-shaped groove (5); the bottom of the U-shaped groove (5) is connected to the transverse water tube (3); the top of the vertical circular tube (1) is inserted into the water level regulating tube (2); at least one overflow port (21) and outlet port (22) are symmetrically provided on the tube wall of the water level regulating tube (2); the water level regulating tube (2) is rotated so that the overflow port (21) is aligned with the overflow port (13) and the outlet port (22) is aligned with the outlet port (14), so that dirty water at the bottom and water on the upper surface of the culture container a are simultaneously discharged into the U-shaped groove (5) and then discharged outward through the transverse water tube (3).

2. The water outlet device with adjustable water level according to claim 1, characterized in that: A hemispherical base is arranged at the bottom of the vertical circular tube (1), and at least one bottom suction port (12) is provided on the base for sucking away impurities at the bottom of the culture container a.

3. The water outlet device with adjustable water level according to claim 1, characterized in that: One end of the transverse water pipe (3) passes through the wall of the culture container a and is threadedly connected to the external pipe (4). A sealing ring (31) is provided at the connection between the wall of the culture container a and the transverse water pipe (3) and the external pipe (4).

4. The water outlet device with adjustable water level according to claim 1, characterized in that: The water level regulating pipe (2) is provided with a water outlet (22) and an overflow port (21) on the pipe wall at different heights. The width of the water outlet (22) is consistent with the width of the water outlet strip (14), and the width of the overflow port (21) is consistent with the width of the overflow strip (13). The water outlets (22) and overflow ports (21) at the same height form a group. The lengths of each group of water outlets (22) and overflow ports (21) are the same and the upper and lower heights are consistent. When the water level regulating pipe (2) is placed vertically, any vertical plane can only pass through one group of water outlets (22) and overflow ports (21). After the water level regulating pipe (2) is inserted into the vertical circular pipe (1), the bottom surface of the water level regulating pipe (2) is lower than the lowest surface of the horizontal water pipe (3).

5. The water outlet device with adjustable water level according to claim 4, characterized in that: The top surface of the water level regulating tube (2) is provided with a water level indication scale (23) and a knob (24) for facilitating the rotation of the water level regulating tube (2).

6. The water outlet device with adjustable water level according to claim 1, characterized in that: The top of the U-shaped through groove (5) is connected to the anti-overflow outlet (6), and the height of the anti-overflow outlet (6) in the breeding container a is higher than the highest points of the overflow bar (13) and the water outlet bar (14).

7. The water outlet device with adjustable water level according to claim 1, characterized in that: The water outlet end of the external pipe (4) can be connected to the water outlet pipeline, and the external pipe (4) can also discharge the water in the culture container a into the filtering area. The filtering area can be located at the bottom, side or back of the culture container a. The water flowing to the filtering area is lower than the lowest design water level of the culture container a and the highest water level of the filtering area is not higher than the operating water level of the culture container a during operation. The water filtered by the filtering area is then discharged from the water inlet pipeline into the culture container a by the circulating water pump.

8. A method for using a water outlet device with adjustable water level, using the water outlet device with adjustable water level as claimed in any one of claims 1 to 7, characterized in that: S1: The filtration area can be located at the bottom, side or back of the aquaculture container a. The waterway flowing to the filtration area is lower than the lowest design water level of the aquaculture container a and the highest water level of the filtration area is not higher than the operating water level of the aquaculture container during operation; S2: Connecting the horizontal water pipe (3) to the external pipe (4) can discharge water or enter the filtration area; S3: A vertical circular tube (1) is arranged in the culture container a, a bottom suction port (12) is arranged at the bottom end of the vertical circular tube (1), a water outlet bar (14) and an overflow bar (13) are provided on the vertical circular tube (1), the water outlet bar (14) and the overflow bar (13) are at the same height from top to bottom, the water outlet bar (14) is connected to a U-shaped through groove (5), and the bottom end of the U-shaped through groove (5) is connected to a horizontal water pipe (3); S4: insert the water level regulating pipe (2) with the overflow port (21) and the water outlet (22) into the vertical circular pipe (1), rotate the top knob (24) to the required water level indication scale (23), align the overflow port (21) and the water outlet (22) at the height corresponding to the water level indication scale (23) with the overflow bar (13) and the water outlet bar (14), when the water level is higher than the lower edge of the symmetrical water outlet (22) and the overflow port (21), the water at the bottom flows through the bottom suction port (12) and then through the water outlet (22) and the water outlet bar (14) to the U-shaped groove (5), the water on the upper surface of the culture container a flows through the overflow port (21) and the overflow bar (13) and then through the water outlet (22) and the water outlet bar (14) to the U-shaped groove (5), and then is discharged from the horizontal water pipe (3) into the external pipe (4) and discharged from the culture container a.

9. The method for using the water outlet device with adjustable water level according to claim 8, characterized in that: T1: When filling water, close the drainage, open the filter water inlet, rotate the water level regulating pipe (2) to set the required water level height value, and when the water reaches the specified height during the filling process, it will flow into the filter area. When the water volume in the filter area reaches the operating requirement of the circulating water pump, turn on the circulating water pump. When the water level reaches the set height, the bottom water flow will be sucked in from the bottom suction port (12) and take away the bottom impurities, while the impurities on the water surface will flow out from the overflow port (21). The water will flow to the filter area through the outlet (22), and the water filling will be stopped to ensure the water level and the normal operation of the filter; T2: Lower the water level, open the drain, stop the water inflow to the filter area, turn off the circulating water pump, rotate the water level regulating tube (2) to set the required water level height value, and the excess water will flow out. When the water level drops to the specified position, the water will automatically stop flowing out; T3: Raise the water level, turn off the circulating water pump, rotate the water level regulating tube (2) to set the required water level height value, start water injection, stop water injection when water flows out of the external pipe (4), and turn on the circulating water pump to realize water circulation filtration again; T4: water change maintenance, open the drain, stop water inflow to the filtration area, turn off the circulating water pump, rotate the water level regulating tube (2) to lower the water level value according to the water change amount, and the excess water flows out. When the water level drops to the specified position, the water automatically stops flowing out. Rotate the water level regulating tube (2) to restore the height value before the water change, stop draining and allow water to flow into the filtration area, start water injection to ensure the water level and normal filtration operation, stop water injection, and turn on the circulating water pump to realize water circulation filtration again.

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