Automatic sewage device for aquaculture pond

Abstract

The utility model discloses an automatic sewage device of aquaculture pond, solves the problem that the sealing element of existing device is easy to wear and tear, leakage and stagnation. The device includes sewage vertical pipe and the inner sleeve pipe of coaxial arrangement in it, and the sewage vertical pipe side wall is opened to have sewage hole, and the up and down movement control sewage hole opening and closing of inner sleeve pipe, and its top is fixedly provided with the buoy, and the buoy top is equipped with buoyancy control device, and the key lies in, and the inner sleeve pipe outside is covered with the water bag of expandable contraction, and the water bag inner chamber is communicated with the buoy inner chamber through the pipeline, and when the buoyancy control device fills water to the buoy, the buoy sinks and drives the inner sleeve pipe to move down, and the water bag fills water and expands and blocks the sewage hole simultaneously, when the buoy drains, the buoy floats and drives the inner sleeve pipe to move up, and the water bag contracts and opens the sewage hole. The utility model discloses the water bag of intercommunication and realizes flexible sealing, and the structure is simple, and effectively avoids the wear and tear, and improves the sealing reliability and operating stability.

Description

Technical Field

[0001] This utility model relates to the field of aquaculture technology, and more specifically, to an automatic sewage discharge device for aquaculture ponds. Background Technology

[0002] In the process of facility-based aquaculture, in order to maintain stable water quality and reduce the occurrence of diseases, the bottom of the aquaculture pond is usually designed as a pot-shaped structure to collect waste, and the sediment such as feces and uneaten feed is regularly discharged through the central sewage pipe.

[0003] Currently, the most common sewage discharge method is still manual operation, which involves pulling the pipe outside the pool to discharge sewage. This method is not only labor-intensive, but also difficult to operate in inclement weather such as rain and snow, significantly affecting the efficiency of sewage discharge. At the same time, because manual operation makes it difficult to accurately control the sewage discharge time of each pool, and sewage discharge at night is not easy to implement, sewage stays in the pool for too long, which can easily lead to water quality deterioration. Although some automatic sewage discharge technologies have been proposed, such as using a float to drive the inner sleeve or side branch pipe airbag structure to open and close the sewage outlet, these devices still have certain limitations in actual long-term operation. Specifically, the inner sleeve relies on the sealing ring for sealing, and after long-term use, the sealing ring is prone to wear, resulting in a decrease in sealing performance and even jamming, affecting the smoothness of sewage discharge. The airbag structure is limited by the installation space in the sewage well, especially in the case of large-diameter sewage pipes or multiple parallel pipes, its layout and maintenance are more difficult, and its applicability is limited. Utility Model Content

[0004] The purpose of this invention is to overcome the defects of existing automatic sewage discharge devices, such as easy wear of sealing components leading to leakage and jamming, and to provide an automatic sewage discharge device for aquaculture ponds that is simple in structure and has reliable sealing.

[0005] To address the aforementioned problems, this utility model provides an automatic sewage discharge device for aquaculture ponds, comprising a sewage discharge riser and an inner sleeve coaxially disposed inside the sewage discharge riser. Multiple sewage discharge holes are provided on the side wall near the bottom of the sewage discharge riser. The inner sleeve moves axially up and down to control the opening or closing of the sewage discharge holes. A float is fixedly mounted on the top of the inner sleeve for controlling its raising and lowering. A buoyancy control device is provided on the top of the float for controlling its filling and draining. An expandable and contractible water bladder is fitted around the outer periphery of the inner sleeve, and the inner cavity of the water bladder is connected to the inner cavity of the float via a first pipeline.

[0006] Compared with existing technologies, this invention has the following advantages: By installing a retractable water bladder connected to the inner cavity of the float outside the inner sleeve, and utilizing a buoyancy control device to drive the float to fill and drain, the internal pressure of the water bladder is simultaneously changed, causing it to expand or contract, thereby controlling the opening and closing of the drain hole. This design cleverly separates and coordinates the driving and sealing functions. Since the expansion and sealing of the water bladder is achieved hydraulically, and there is a flexible contact between it and the inner sleeve, the wear and leakage problems caused by long-term friction of traditional rigid sealing rings are avoided. This significantly improves sealing reliability and device lifespan, while also reducing the risk of movement jamming.

[0007] As an improvement, the buoyancy control device includes a miniature water pump, a water ejector, and a solenoid valve mounted on the top of the float. The top of the float has an air inlet, and the bottom has a drain outlet. The inlet of the miniature water pump is connected to the water in the aquaculture pond via an inlet pipe, and the outlet of the miniature water pump is equipped with a one-way valve, which connects to the high-pressure working fluid inlet of the water ejector. The drain outlet of the float is connected to the low-pressure ejector fluid inlet of the water ejector via a second pipeline. The solenoid valve is located at the mixed fluid outlet of the water ejector to control the opening and closing of this outlet. This technical solution utilizes the miniature water pump to provide a high-pressure water source to drive the water ejector. The negative pressure generated by the water ejector efficiently extracts water from inside the float through the second pipeline, and the solenoid valve controls the entire fluid circuit, thereby achieving automatic and rapid switching between the float's filling and draining states. This provides a stable and controllable power source for the raising and lowering of the inner sleeve, ensuring the accuracy of the timing control of sewage discharge and the reliability of the device's operation.

[0008] As an improvement, the air inlet of the float is connected to a vertical pipe that communicates with the atmosphere. A high-level controller and a low-level controller are installed sequentially from top to bottom on the outer wall of the vertical pipe, and both are electrically connected to a micro water pump. When the micro water pump starts and the solenoid valve is closed, the float and water bladder enter a water injection and pressurization state. If the water level in the vertical pipe rises to the trigger position of the high-level controller, the high-level controller stops the micro water pump to prevent water from overflowing from the vertical pipe and to maintain the sealing pressure of the water bladder. When both the micro water pump and the solenoid valve are closed, if a leak occurs in the float or connecting pipe, causing the water level in the vertical pipe to drop to the trigger position of the low-level controller, the low-level controller starts the micro water pump to replenish water into the float, thereby compensating for pressure loss and ensuring that the pressure inside the water bladder remains higher than the external pool water pressure, thus maintaining an expanded and sealed state. This technical solution, through a vertical pipe connected to the atmosphere and in conjunction with two water level controllers, forms a closed-loop automatic monitoring and regulation system for the water level inside the float and water bladder. This system can sense water level changes in real time and automatically start or stop the micro water pumps to replenish water or stop altogether. Its core purpose is to maintain a stable pressure inside the water bladder higher than the external pool water, ensuring a reliable expansion and sealing effect. The high-level controller stops the water pump after the set pressure is reached, preventing water from overflowing from the vertical pipe due to continuous pump operation. The low-level controller promptly starts the water pump to replenish pressure in case of leakage. This effectively ensures that the sewage discharge device maintains a stable sealing state under various operating conditions, improving the system's adaptability and long-term operational reliability.

[0009] As an improvement, an upper limit retaining ring is installed on the inner wall of the sewage riser above the sewage outlet, and a lower limit retaining ring is installed on the inner wall of the sewage riser below the sewage outlet. The inner sleeve moves vertically between the upper and lower limit retaining rings. This technical solution, by setting two mechanical retaining rings, provides a clear physical limit for the axial movement of the inner sleeve, preventing it from rising or falling excessively due to changes in buoyancy or water flow impact. This ensures that the inner sleeve can accurately stop at the designed position of fully opening or fully closing the sewage outlet, protecting the inner sleeve and the external water bladder from mechanical damage, and also ensuring the accuracy and consistency of sealing and sewage discharge during sewage operations. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the external installation of this utility model. Figure 3 This is a schematic diagram of the installation inside the pool according to this utility model.

[0011] Explanation of reference numerals in the attached figures: 1. Sewage riser; 10. Sewage outlet; 11. Upper limit retaining ring; 12. Lower limit retaining ring; 2. Inner sleeve; 3. Float; 31. Air inlet; 32. Drain outlet; 4. Buoyancy control device; 41. Miniature water pump; 42. Water ejector; 43. Solenoid valve; 5. Water bladder; 51. First pipeline; 52. Second pipeline; 6. Check valve; 7. Vertical pipe; 71. High water level controller; 72. Low water level controller. Detailed Implementation

[0012] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0013] like Figure 1 As shown, an automatic sewage discharge device for aquaculture ponds includes a sewage discharge riser 1 and an inner sleeve 2 coaxially disposed inside the sewage discharge riser 1. Multiple sewage discharge holes 10 are provided on the side wall near the bottom of the sewage discharge riser 1. The inner sleeve 2 moves axially up and down to control the opening or closing of the sewage discharge holes 10. A float 3 is fixedly installed at the top of the inner sleeve 2 to control its raising and lowering. A buoyancy control device 4 is installed at the top of the float 3 to control its filling and draining of water. An expandable and contractible water bladder 5 is fitted around the outer periphery of the inner sleeve 2. The inner cavity of the water bladder 5 is connected to the inner cavity of the float 3 through a first pipe 51. The inner sleeve 2 is vertically continuous, and the float 3 is fixedly installed at the top center of the inner sleeve 2 by a bracket.

[0014] When it is necessary to close the drain hole 10, the buoyancy control device 4 is activated and fills the float 3 with water. As the water volume in the float 3 increases, its total weight increases, causing the inner sleeve 2 connected to it to move downwards along the axial direction of the drain riser 1. At the same time, since the inner cavity of the water bladder 5 is directly connected to the inner cavity of the float 3 through the first pipe 51, the process of filling the float 3 with water also causes the water bladder 5 to be filled with water and expand and deform synchronously. The expanding water bladder 5 expands radially, tightly adhering to and sealing the drain hole 10 on the side wall of the drain riser 1, thereby achieving reliable closure of the drain channel.

[0015] Conversely, when it is necessary to open the drain hole 10, the buoyancy control device 4 switches to drainage mode, discharging the water from the float 3. As the water volume in the float 3 decreases, its weight decreases while its net buoyancy increases, causing the inner sleeve 2 to move upwards. Simultaneously, the connecting pipe releases the internal pressure of the water bladder 5, and the water inside flows back to the float 3 under the pressure difference, causing the water bladder 5 to contract and reset, releasing its blockage of the drain hole 10. The drain hole 10 then opens, allowing the accumulated waste at the bottom of the aquaculture pond to pass through the drain hole 10 and be discharged into the drain riser 1 under hydrostatic pressure.

[0016] In this embodiment, a retractable water bladder 5, communicating with the inner cavity of the float 3, is fitted outside the inner sleeve 2. When the float 3 is filled or drained using the buoyancy control device 4, the internal pressure of the water bladder 5 is simultaneously changed, causing it to expand or contract, thereby controlling the opening and closing of the drain hole 10. This design cleverly separates and coordinates the driving and sealing functions. Since the expansion and sealing of the water bladder 5 is achieved hydraulically, and there is a flexible contact between it and the inner sleeve 2, the wear and leakage problems caused by long-term friction of traditional rigid sealing rings are avoided. This significantly improves sealing reliability and device lifespan, while also reducing the risk of movement jamming.

[0017] like Figure 1 and Figure 2 As shown, the buoyancy control device 4 includes a miniature water pump 41, a water ejector 42, and a solenoid valve 43, all mounted on the top of the float 3. The float 3 has an air inlet 31 at the top and a drain outlet 32 ​​at the bottom. The water inlet of the miniature water pump 41 is connected to the water in the aquaculture pond via an inlet pipe. The water outlet of the miniature water pump 41 is equipped with a one-way valve 6, which connects to the high-pressure working fluid inlet of the water ejector 42. The drain outlet 32 ​​of the float 3 is connected to the low-pressure ejector fluid inlet of the water ejector 42 via a second pipe 52. The solenoid valve 43 is located at the mixed fluid outlet of the water ejector 42 and is used to control the opening and closing of this mixed fluid outlet. The air inlet 31 allows external air to enter the inner cavity of the float 3 during drainage, thereby increasing the buoyancy of the float 3.

[0018] When the float 3 is in the water-filled and submerged state (i.e., the drain hole 10 is closed), the solenoid valve 43 is in the closed state, the micro water pump 41 starts, and draws water from the aquaculture pond. The water flows through the micro water pump 41 and the one-way valve 6 in sequence, and enters the high-pressure working fluid inlet of the ejector 42. Since the mixed fluid outlet of the ejector 42 is blocked by the solenoid valve 43, the high-pressure water flow cannot form an effective jet, and the ejector 42 does not play an ejection role. At this time, the water flow actually enters the float 3 connected to it directly through the structure of the ejector 42. The pond water continues to be injected into the float 3, the weight of the float 3 increases, and the inner sleeve 2 connected to it drives down against the expansion force and frictional resistance of the water bladder 5 until the water bladder 5 is compressed and expands and tightly seals the drain hole 10 on the drain riser 1, completing the closing action. When the float 3 is in the upward drainage state (i.e., the drain hole 10 is open), the solenoid valve 43 is opened, and the micro water pump 41 is also started. The pumped pool water is used as a high-pressure working fluid to pass through the ejector 42 at high speed, and a significant negative pressure is generated at its low-pressure ejector fluid inlet. This negative pressure acts on the drain outlet 32 ​​at the bottom of the float 3 through the second pipe 52, thereby efficiently pumping out the water in the float 3. The water in the float 3 (ejector fluid) and the high-pressure working fluid are mixed in the ejector 42 and discharged to the outside (i.e., into the drain riser 1) through the opened solenoid valve 43. As the water volume in the float 3 decreases rapidly, its buoyancy increases, which drives the inner sleeve 2 to rise. The water bladder 5 then contracts and rebounds, and the drain hole 10 is opened. The sewage at the bottom of the pool is discharged through the drain hole 10 under static pressure.

[0019] This technical solution utilizes a micro water pump 41 to provide a high-pressure water source to drive the water ejector 42. The negative pressure generated by the water ejector 42 efficiently extracts water from the float 3 through the second pipeline 52. The entire fluid circuit is controlled by the on / off control of the solenoid valve 43, thereby realizing the automatic and rapid switching between the filling and draining states of the float 3. This provides a stable and controllable power source for the raising and lowering of the inner sleeve 2, ensuring the accuracy of the sewage discharge timing control and the reliability of the device operation.

[0020] like Figures 1 to 3 As shown, the air inlet 31 of the float 3 is connected upward to a vertical pipe 7 that communicates with the atmosphere. A high-level controller 71 and a low-level controller 72 are sequentially installed on the outer wall of the vertical pipe 7 from top to bottom. The high-level controller 71 and the low-level controller 72 are electrically connected to the micro water pump 41. When the micro water pump 41 starts and the solenoid valve 43 closes, the float 3 and the water bladder 5 enter a water injection and pressurization state. If the water level in the vertical pipe 7 rises to the trigger position of the high-level controller 71, the high-level controller 71 controls... The micro water pump 41 stops operating to prevent water from overflowing from the vertical pipe 7 and to maintain the sealing pressure of the water bladder 5. When both the micro water pump 41 and the solenoid valve 43 are in the closed state, if a leak occurs in the float 3 or the connecting pipe, causing the water level in the vertical pipe 7 to drop to the trigger position of the low water level controller 72, the low water level controller 72 controls the micro water pump 41 to start operating to replenish water into the float 3, thereby compensating for the pressure loss and ensuring that the pressure in the water bladder 5 remains higher than the external pool water pressure to maintain the expansion and sealing state.

[0021] The principle and process of the high water level controller 71 controlling the micro water pump 41 to stop operating: This process occurs during the water injection and pressurization state of the float 3 and water bladder 5. When the system needs to close the drain hole 10, the solenoid valve 43 closes, the micro water pump 41 starts, and injects pool water into the float 3. As the injection proceeds, the water level and pressure in the float 3 rise, and the air at its top is discharged into the vertical pipe 7 connected to it through the air inlet 31, causing the water level in the vertical pipe 7 to rise synchronously. When the water level in the riser 7 reaches the preset trigger position of the high water level controller 71, the high water level controller 71 (usually an electrode type, float type, or capacitive sensor) detects the contact of water or changes in the medium, and then generates an electrical signal. This signal is transmitted to the control circuit of the micro water pump 41, triggering it to stop running. At this point, the water injection and pressurization process is automatically terminated, and the pressure in the float 3 and the water bladder 5 is stabilized at the set value. This measure, on the one hand, avoids water overflowing from the riser 7 due to the continuous operation of the micro water pump 41, and on the other hand, ensures that the water bladder 5 can obtain and maintain a pressure higher than that of the external pool water, thereby achieving a reliable expansion seal.

[0022] The principle and process of the low water level controller 72 controlling the start-up of the micro water pump 41: This process mainly operates as a compensation mechanism to maintain the sealing pressure. During the normal intermittent period when the float 3 has finished filling with water and the micro water pump 41 has stopped, or when the device is in a non-filling operation mode, if the float 3 or its connecting pipes leak unexpectedly, the water level and pressure in the float 3 and the water bladder 5 connected to it will slowly decrease. When the leakage continues, causing the water level in the vertical pipe 7 to drop to the preset position of the low water level controller 72, the low water level controller 72 detects that the water level has left its sensing point and immediately generates a trigger signal, which is then transmitted immediately. The control system of the micro water pump 41 is commanded to restart. After the micro water pump 41 starts, it begins to replenish water into the float 3 until the water level rises again and triggers the high water level controller 71 to stop the water pump. This restores and stabilizes the water level and pressure in the float 3 and the water bladder 5 within the set range. The core function of this process is to ensure that the water bladder 5 can maintain a pressure higher than that of the external pool water, so that the water bladder 5 is always in the necessary expansion state to effectively seal the drain hole 10 and prevent the seal failure and leakage of the drain hole 10 due to insufficient pressure. This significantly improves the sealing reliability and stability of the system during long-term operation.

[0023] This technical solution, through the vertical pipe 7 connecting to the atmosphere and in conjunction with two water level controllers, forms a closed-loop automatic monitoring and regulation system for the water level inside the float 3 and water bladder 5. This system can sense water level changes in real time and automatically start or stop the micro water pump 41 to replenish water or stop it altogether. Its core purpose is to maintain a stable pressure inside the water bladder 5 that is higher than the external pool water, ensuring a reliable expansion and sealing effect. The high water level controller 71 stops the water pump after the set pressure is reached, preventing water from overflowing from the vertical pipe 7 due to continuous pump operation; the low water level controller 72 is used to promptly start the water pump to replenish pressure in case of leakage. This effectively ensures that the sewage discharge device maintains a stable sealing state under various operating conditions, improving the system's adaptability and long-term operational reliability.

[0024] like Figure 1 and Figure 3 As shown, an upper limit retaining ring 11 is provided on the inner wall of the sewage riser 1 above the sewage outlet 10, and a lower limit retaining ring 12 is provided on the inner wall of the sewage riser 1 below the sewage outlet 10. The inner sleeve 2 is positioned vertically between the upper limit retaining ring 11 and the lower limit retaining ring 12. This technical solution provides a clear physical limit for the axial movement of the inner sleeve 2 by setting two mechanical retaining rings, preventing it from rising or falling excessively due to changes in buoyancy or water flow impact. This ensures that the inner sleeve 2 can accurately stop at the designed position of fully opening or fully closing the sewage outlet 10, protecting the inner sleeve 2 and the outer water bladder 5 from mechanical damage, and also ensuring the accuracy and consistency of sealing and sewage discharge during sewage discharge operations.

[0025] Although the disclosure is as stated above, the scope of protection of this disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this utility model.

Claims

1. An automatic sewage discharge device for aquaculture ponds, comprising a sewage discharge riser (1) and an inner sleeve (2) coaxially disposed inside the sewage discharge riser (1), wherein the sewage discharge riser (1) has a plurality of sewage discharge holes (10) on its side wall near the bottom, and the inner sleeve (2) controls the opening or closing of the sewage discharge holes (10) by moving up and down along the axial direction, characterized in that: The top of the inner sleeve (2) is fixedly provided with a float (3) for controlling its lifting and lowering. The top of the float (3) is provided with a buoyancy control device (4) for controlling the filling and draining of water in the float (3). The outer periphery of the inner sleeve (2) is provided with an expandable and contractible water bladder (5). The inner cavity of the water bladder (5) is connected to the inner cavity of the float (3) through a first pipeline (51).

2. The automatic sewage discharge device for aquaculture ponds according to claim 1, characterized in that: The buoyancy control device (4) includes a micro water pump (41), a water ejector (42), and a solenoid valve (43) installed on the top of the float (3). The top of the float (3) is provided with an air inlet (31), and the bottom is provided with a drain outlet (32). The water inlet of the micro water pump (41) is connected to the water in the aquaculture pond through an inlet pipe. The water outlet of the micro water pump (41) is provided with a one-way valve (6), and is connected to the high-pressure working fluid inlet of the water ejector (42) through the one-way valve (6). The drain outlet (32) of the float (3) is connected to the low-pressure ejector fluid inlet of the water ejector (42) through a second pipeline (52). The solenoid valve (43) is installed at the mixed fluid outlet of the water ejector (42) and is used to control the opening and closing of the mixed fluid outlet.

3. The automatic sewage discharge device for aquaculture ponds according to claim 2, characterized in that: The air inlet (31) of the float (3) is connected upward to a vertical pipe (7) that communicates with the atmosphere. A high water level controller (71) and a low water level controller (72) are arranged sequentially from top to bottom on the outer wall of the vertical pipe (7). The high water level controller (71) and the low water level controller (72) are electrically connected to the micro water pump (41). When the micro water pump (41) is started and the solenoid valve (43) is closed, the float (3) and the water bladder (5) enter the water injection and pressurization state. If the water level in the vertical pipe (7) rises to the trigger position of the high water level controller (71), the high water level controller (71)... The micro water pump (41) is stopped to prevent water from overflowing from the vertical pipe (7) and to maintain the sealing pressure of the water bladder (5). When both the micro water pump (41) and the solenoid valve (43) are closed, if the float (3) or the connecting pipe leaks and the water level in the vertical pipe (7) drops to the trigger position of the low water level controller (72), the low water level controller (72) controls the micro water pump (41) to start running to replenish water into the float (3), thereby compensating for pressure loss and ensuring that the pressure in the water bladder (5) remains higher than the external pool water pressure and maintains an expanded and sealed state.

4. The automatic sewage discharge device for aquaculture ponds according to claim 1, characterized in that: An upper limit retaining ring (11) is provided on the inner wall of the sewage riser (1) above the sewage hole (10), and a lower limit retaining ring (12) is provided on the inner wall of the sewage riser (1) below the sewage hole (10). The inner sleeve (2) is moved up and down between the upper limit retaining ring (11) and the lower limit retaining ring (12).

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