Automatic opening and closing type air lift device and sewage treatment system

Abstract

This application discloses an automatic opening and closing type airlift device and a sewage treatment system, relating to the field of sewage treatment technology. The automatic opening and closing type airlift device includes a shell, with a lifting chamber formed inside the shell. An inlet is provided on the shell, and a check valve is installed at the inlet to prevent backflow of sewage into the lifting chamber. An air inlet pipe is connected to the shell, with one end connected to the lifting chamber to form a positive pressure air inlet, and the other end connected to an external positive pressure air pipe. A sealing element is provided near the positive pressure air inlet on the air inlet pipe, and the sealing element is connected to a float floating in the lifting chamber via a transmission component. An airlift pipe is also connected to the shell, and an airlift air inlet assembly is provided on the airlift pipe. With the above structural design, sewage can be lifted without relying on electricity. Based on the above automatic opening and closing type airlift device, the sewage treatment system can collect and treat sewage at different depths in an energy-saving and efficient manner.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and more specifically, to an automatic on / off type airlift device and wastewater treatment system. Background Technology

[0002] There are usually multiple sewage outlets along the riverbank. By installing negative pressure lift pumps at the sewage outlets, the sewage discharged from the outlets can be lifted to a certain height and then transported to the sewage treatment center for centralized treatment through gravity drainage pipelines.

[0003] To achieve the aforementioned functional effects, a negative pressure boosting pump station needs to be established, and cables need to be laid along the river to supply AC 380V power to the negative pressure boosting pumps located at each sewage outlet. Clearly, the underground cables would pose a safety hazard to agricultural activities.

[0004] In addition, the distance between the various sewage outlets is relatively far. In order to ensure that there is still sufficient negative pressure to lift the sewage at the sewage outlets that are far from the negative pressure lift pump, the entire sewage treatment system needs to be equipped with multiple lift pump stations, which is costly and consumes a lot of electricity. Summary of the Invention

[0005] In view of the problem that the operation of using negative pressure lift pumps to lift and collect sewage along rivers poses safety hazards to agricultural activities and has high operating costs, the first objective of this application is to propose an automatic opening and closing type air lift device that does not rely on electricity to lift sewage; based on the above-mentioned automatic opening and closing type air lift device, the second objective of this application is to propose a sewage treatment system that can collect and treat sewage at different depths in an energy-saving and effective manner.

[0006] The specific plan is as follows:

[0007] An automatic opening and closing type air lifting device includes a housing, an internal lifting chamber, a water inlet on the housing, and a check device at the water inlet to prevent sewage from flowing back into the lifting chamber.

[0008] An air intake pipe is connected to the shell. One end of the air intake pipe is connected to the lifting cavity to form a positive pressure air intake port, and the other end is connected to an external positive pressure air pipeline. A sealing element is provided near the positive pressure air intake port of the air intake pipe. The sealing element is connected to a float that is floating in the lifting cavity via a transmission element.

[0009] The shell is also connected to an air-lift pipe. One end of the air-lift pipe extends into the bottom area of ​​the lifting chamber to form a sewage lifting port, and the other end is connected to the gravity drainage pipe outside the shell. An air-lift air intake assembly is provided on the air-lift pipe.

[0010] Wherein, the opening height of the air lift air intake component is not less than the maximum floating height of the float;

[0011] When the liquid level in the lifting chamber is at the first height, the float rises and drives the sealing component to move via the transmission component, opening the positive pressure air inlet.

[0012] When the liquid level in the lifting chamber is at the second height, the float moves downward and drives the sealing component to move via the transmission component, thus sealing the positive pressure air inlet.

[0013] By adopting the above technical solution, the positive pressure air inlet of the airlift device can be opened or closed solely based on its structural characteristics, without relying on electric power. Specifically, when the sewage level in the airlift device reaches the first height, the float uses buoyancy to drive the sealing component to open the positive pressure air inlet, inputting positive pressure air to lift the sewage. When the sewage level in the airlift device is at the second height, the float uses gravity to drive the sealing component to close the positive pressure air inlet, stopping the input of positive pressure air. The airlift device is entirely a mechanical structure, ensuring reliable and stable performance. Furthermore, it eliminates the need for underground cable laying, avoiding... This eliminates safety hazards to agricultural activities. By placing the sealing element at the air inlet pipe, the opening and closing of the sealing element can control the air pressure state within the entire lifting chamber. This allows the air-lifting device to self-regulate the air pressure inside the lifting chamber, enabling the positive pressure air and sewage to mix more quickly and evenly, and then lift them to the outside of the shell. Since mixing sewage and air is relatively difficult, an air-lifting inlet component is installed to provide a channel for positive pressure air to enter the bottom of the sewage, promoting full contact between the positive pressure air and the sewage. This creates a low-density, easily lifted spherical flow at the bottom of the air-lifting pipe, ensuring the efficiency of the air-lifting device in lifting sewage.

[0014] Preferably, the section of the air intake pipe near the positive pressure air intake is vertically arranged and configured as a sealing section with a gradually decreasing inner diameter;

[0015] The sealing element is configured as a sealing ball and is movably disposed within the sealing section;

[0016] The transmission component includes a lead screw, one end of which is fixedly connected to the sealing ball, and the other end extends vertically downward and is fixedly connected to the float.

[0017] When the liquid level in the lifting chamber is at the first height, the float rises and the sealing ball moves upward via the screw, opening the positive pressure air inlet.

[0018] When the liquid level in the lifting chamber is at the second height, the float moves downward and the sealing ball moves downward via the screw, blocking the positive pressure air inlet.

[0019] By adopting the above technical solution, the height of the float is adjusted by the height of the liquid level in the lifting chamber. The float drives the sealing ball set in the air intake pipe to move up and down through the screw drive, thereby opening or closing the positive pressure air intake. The structure is simple and stable.

[0020] Preferably, at least one limiting member is connected to the inner wall of the housing. The limiting member includes a connecting rod with one end connected to the inner wall of the housing and a limiting ring connected to the other end of the connecting rod. The lead screw passes through the limiting ring.

[0021] By adopting the above technical solution, the limiting component can restrict the movement path of the lead screw, the sealing balls at both ends, and the float, ensuring that the movement path of the sealing ball is vertical and adapting to the vertically set sealing section. This allows for timely closing or opening of the positive pressure air inlet, preventing the float from drifting laterally and causing the sealing ball to get stuck at the positive pressure air inlet, thus ensuring the stable operation of the air lifting device. At the same time, the limiting ring can also limit the upward floating height of the float.

[0022] Preferably, the section of the air intake pipe near the positive pressure air intake is inclined downwards;

[0023] The sealing element is configured as a sealing ball whose shape and size are adapted to the positive pressure air inlet pipe;

[0024] The transmission component includes a rotating lever and a rotating shaft fixedly connected to the inner wall of the housing. The rotating lever is rotatably connected to the rotating shaft at its middle position, one end of which is fixedly connected to the sealing ball, and the other end is fixedly connected to the float. The positive pressure air inlet is located on the rotation path of the sealing ball.

[0025] When the liquid level in the lifting chamber is at the lowest liquid level height, the float is at the lowest point, and the sealing ball blocks the positive pressure air inlet;

[0026] When the liquid level in the lifting chamber exceeds the critical liquid level height, the float drives the rotating lever to rotate, which in turn drives the sealing ball to open the positive pressure air inlet.

[0027] By adopting the above technical solution, in the initial state, the liquid level in the lifting chamber is low, and the float is stationary under its own weight. The rotating lever drives the sealing ball to block the positive pressure air inlet. When the liquid level in the lifting chamber rises to a certain height, the buoyancy of the float is greater than its weight, and it floats up, causing the sealing ball to rotate around the axis. At this time, the sealing ball opens the positive pressure air inlet. Thus, the opening and closing of the positive pressure air inlet is controlled by lever and sealing ball. This method is suitable for inclined air inlet pipes, has a simple structure, and stable performance.

[0028] Preferably, the air-lift intake assembly includes a bent intake pipe, one end of which is connected to the air-lift pipe near the sewage lifting port, and the other end extends upward to the top area of ​​the lifting chamber, with the opening height not lower than the maximum floating height of the float.

[0029] By adopting the above technical solution, positive pressure air enters the top opening of the bent air inlet from the positive pressure air inlet, and then enters the air lifting pipe to mix with sewage to form a low-density gas-liquid mixture, which is then lifted to the external gravity drainage pipe through the air lifting pipe. The connection is set near the sewage lifting port to facilitate the mixing of air and sewage at the bottom. The top opening is set in the top area of ​​the lifting chamber, which can reduce the probability of sewage flowing into the bent air inlet from the top opening when the sewage level rises, causing the air lifting device to fail.

[0030] Preferably, the air lift intake assembly includes multiple rectifier air pipes connected to the intake pipe. One end of each rectifier air pipe is connected to the intake pipe and the connection position is located between the sealing point of the sealing member and the positive pressure intake port. The other end extends into the air lift pipe and is bent upward, forming multiple air lift intake ports from top to bottom inside the air lift pipe.

[0031] By adopting the above technical solution, multiple rectifier air pipes can supplement positive pressure air from multiple air lift inlets, further reducing the density of the gas-liquid mixture and accelerating the lifting speed of sewage; at the same time, the rectifier air pipes are directly connected to the air inlet pipe, which can prevent sewage from entering the air lift inlet assembly from the opening.

[0032] Preferably, the air lift inlet located below the air lift pipe is configured as a slug-shaped flow air inlet, and a bubble generating plate is provided at its opening;

[0033] The air lift-up air inlet located above the bullet-shaped air inlet is configured as a cluster-shaped air inlet, and its opening is equipped with a microbubble generating plate with an air hole diameter smaller than that of the bubble generating plate.

[0034] By adopting the above technical solution, the bubble generating plate at the bottom can blow large bubbles into the air lifting pipe, so that the gas and liquid mix to form a slug flow, and the micro bubble generating plate at the top can continuously blow tiny bubbles into the air lifting pipe to replenish positive pressure air, further reducing the density of the slug flow and making it easier to lift.

[0035] Preferably, each of the multiple microbubble generating plates located above the bubble generating plate is provided with at least one cutting surface for cutting the slug flow in the airlift pipe into a cluster flow.

[0036] By adopting the above technical solution, the slug-shaped flow formed below is continuously cut into clump-shaped flow by the cutting surface of the microbubble generating plate during the upward process. After continuous gas replenishment, the primary state of the clump-shaped flow is transformed into the advanced state of the clump-shaped flow, making it easier to lift.

[0037] Preferably, the air intake pipe is provided with a pressure regulating component, which is configured as a control ball valve. The control ball valve includes a hemispherical valve core and a pressure regulating rod connected to the arc surface of the hemispherical valve core.

[0038] By adopting the above technical solution, the air pressure of the positive pressure air transported in the air intake pipe can be adjusted by the air pressure regulating component. When it is necessary to lift sewage from a deeper underground location, the air pressure is increased to lift the sewage to a higher height; when it is necessary to lift sewage from a shallower underground location, the air pressure is decreased to lift the sewage to a lower height, so that the air lifting device can adapt to situations where there are large differences in the depth of sewage outlets on the riverbank.

[0039] Preferably, the air lifting device is further equipped with an air pressure balancing component for stabilizing the air pressure inside the lifting chamber. The air pressure balancing component is connected to the air pressure regulating component and controls the operation of the air pressure regulating component in response to changes in the air pressure inside the lifting chamber.

[0040] By adopting the above technical solution, the positive pressure air volume delivered into the lifting chamber can be adjusted by the feedback adjustment of the air pressure regulating component through the air pressure balance component. This avoids the phenomenon that after the sewage is lifted, the air pressure in the lifting chamber drops too quickly and becomes less than the pressure of the external gravity drainage pipe, causing the sewage to be forced back into the lifting chamber.

[0041] Preferably, the air pressure balancing assembly includes a piston cylinder disposed on the housing and communicating with the lifting chamber, a piston slidably disposed in the piston cylinder, a telescopic rod slidably disposed along the piston cylinder axis and sealed, and a transmission rod whose two ends are respectively rotatably connected to the air pressure regulating rod and the telescopic rod;

[0042] One end of the telescopic rod is fixedly connected to the piston, and the other end is rotatably connected to the end of the transmission rod away from the air pressure regulating rod.

[0043] By adopting the above technical solution, the piston and transmission rod are used to drive the air pressure regulating rod. The whole structure is set as a mechanical structure, which has stable and reliable performance and timely feedback.

[0044] Preferably, the water inlet is located on the side wall of the housing near the bottom area and is connected to a water inlet pipe, and the check device includes a check valve disposed on the water inlet pipe.

[0045] By adopting the above technical solution, the check valve can prevent sewage in the lifting chamber from flowing back along the inlet pipe.

[0046] Preferably, the water inlet is located at the bottom of the housing, and the check valve is configured as a movable cover plate located inside the housing, with a shape and size adapted to the water inlet. One side of the movable cover plate is rotatably connected to the inner wall of the housing, so that the movable cover plate covers the water inlet under its own weight.

[0047] By adopting the above technical solution, the sewage can be blocked from flowing back by relying on the structure of the movable cover plate itself. The air lift device can be directly inserted into the sewage tank to lift and treat the sewage, which is suitable for open sewage tanks.

[0048] A wastewater treatment system includes an air compressor, a positive pressure air pipeline, a gravity drainage pipeline, a wastewater treatment device installed at the end of the gravity drainage pipeline, and a plurality of automatic opening and closing airlift devices as described above.

[0049] The air inlet pipe of the automatic opening and closing type air lifting device is connected to the positive pressure air pipeline, the water inlet is connected to the user's water supply, and the end of the air lifting pipe located outside the shell is connected to the gravity drainage pipeline.

[0050] By adopting the above technical solutions, the sewage treatment system can treat sewage over a large area without laying underground cables or building booster pump stations. It only requires compressed air equipment and pre-burying positive pressure air pipelines at the sewage outlet.

[0051] Preferably, the pressure of the positive pressure air pipeline connected to the air intake pipeline is set to 0.2-0.5 MPa, and the slope of the gravity drainage pipeline is set to 0.15-0.3%.

[0052] By adopting the above technical solutions, it is possible to ensure that the air-lift device can be raised to a higher height while connecting more air-lift devices, thereby achieving wastewater treatment over a wider area; and wastewater can be discharged to the terminal wastewater treatment equipment by gravity.

[0053] Compared with the prior art, the beneficial effects of this application are as follows:

[0054] (1) The positive pressure air inlet of the air lifting device can be opened or closed without relying on electric power, relying solely on its own structural characteristics. When the sewage level of the air lifting device reaches the first height, the float uses buoyancy to drive the sealing part to open the positive pressure air inlet and input positive pressure air to lift the sewage. When the sewage level of the air lifting device is at the second height, the float uses gravity to drive the sealing part to seal the positive pressure air inlet and stop inputting positive pressure air. The air lifting device is set as a mechanical structure, with reliable and stable performance. At the same time, it does not require laying cables underground, avoiding safety hazards to agricultural activities and saving costs.

[0055] (2) By setting the sealing component at the air inlet pipe, the opening and closing of the sealing component can control the air pressure state in the entire lifting chamber, so that the air lifting device can self-feedback adjust the air pressure inside the lifting chamber, so that the positive pressure air and sewage can be mixed more quickly and evenly and lifted to the outside of the shell; Since it is difficult to mix sewage and air, by setting the air lifting air inlet component, a channel for positive pressure air to enter the bottom of sewage is provided, which promotes the full contact between positive pressure air and sewage, and forms a low-density, easily lifted spherical flow at the bottom of the air lifting pipe, ensuring the efficiency of the air lifting device in lifting sewage;

[0056] (3) By setting up multiple rectifier air pipes, positive pressure air can be supplied from multiple air lift inlets. At the same time, the spherical flow formed below is continuously cut into a clump flow by the cutting surface of the microbubble generating plate during the upward process. After continuous air supply, the primary state of the clump flow is transformed into the advanced state of the clump flow, making it easier to lift.

[0057] (4) By setting up an air pressure balance component, the positive pressure air volume delivered into the lifting chamber can be adjusted by the feedback adjustment of the air pressure balance component. This avoids the phenomenon that the air pressure in the lifting chamber drops too quickly after the sewage is lifted, and is less than the pressure of the external gravity drainage pipe, causing the sewage to be pushed back into the lifting chamber.

[0058] (5) By utilizing the above-mentioned air-lift device to construct a wastewater treatment system, a larger-scale wastewater treatment can be achieved in an energy-saving, safe, and effective manner. Attached Figure Description

[0059] Figure 1 This is an overall schematic diagram of Embodiment 1 of this application;

[0060] Figure 2 This is an overall schematic diagram of another embodiment of the present application;

[0061] Figure 3 This is an optimized overall schematic diagram of Embodiment 1 of this application;

[0062] Figure 4 This is an overall schematic diagram of Embodiment 2 of this application;

[0063] Figure 5 This is an overall schematic diagram of Embodiment 3 of this application;

[0064] Figure 6 This application presents a schematic diagram of a wastewater treatment system.

[0065] Reference numerals: 1. Shell; 10. Lifting chamber; 11. Inlet; 110. Inlet pipe; 2. Check valve; 21. Movable cover; 3. Air inlet pipe; 30. Positive pressure air inlet; 31. Sealing section; 4. Sealing component; 40. Sealing ball; 41. Transmission component; 410. Limiting component; 42. Float; 5. Air lift pipe; 50. Sewage lifting port; 6. Air lift air inlet assembly; 61. Bent air inlet pipe; 62. Rectifying air pipe; 621. Bubble generating plate; 622. Microbubble generating plate; 7. Air pressure regulating assembly; 70. Air pressure regulating rod; 8. Air pressure balancing assembly; 81. Piston cylinder; 82. Piston; 83. Telescopic rod; 84. Transmission rod; 90. Air compressor; 91. Positive pressure air pipeline; 92. Gravity drainage pipeline; 93. Sewage treatment equipment. Detailed Implementation

[0066] The present application will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of the present application is not limited thereto.

[0067] In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0068] Example 1

[0069] An automatic opening and closing type air lifting device, such as Figure 1 As shown, the device includes a cylindrical shell 1 with a lifting cavity 10 inside. A water inlet 11 is connected to the side wall of the shell 1 near the bottom area, and a water inlet pipe 110 is connected to the water inlet 110. To prevent sewage from flowing back into the lifting cavity 10, a check valve 2 is provided on the water inlet pipe 110. In this embodiment, the check valve 2 is configured as a check valve. An air lifting pipe 5 is also connected to the top of the shell 1.

[0070] Since the air-lift device needs to be placed in or in contact with sewage for a long time, and the sewage may contain corrosive components, the material of the entire air-lift device is preferably corrosion-resistant materials such as stainless steel or hard plastic.

[0071] The top of the housing 1 is connected to an air inlet pipe 3. One end of the air inlet pipe 3 is connected to an external positive pressure air pipe 91, and the other end, which is connected to the lifting chamber 10, is configured as a positive pressure air inlet 30 for supplying positive pressure air into the lifting chamber 10. In this embodiment, the end of the air inlet pipe 3 near the positive pressure air inlet 30 extends into the lifting chamber 10. The external positive pressure air pipe continuously supplies air into the air inlet pipe 3. After several experiments, it was found that when the positive pressure air pressure is selected to be 0.2-0.5 MPa, it can ensure the lifting effect of the air lifting device on sewage while being energy-saving. It can also connect more air lifting devices to treat a larger area of ​​sewage. In this embodiment, the positive pressure air pressure is preferably 0.3 MPa.

[0072] A sealing element 4 is provided in the air intake pipe 3 near the positive pressure air intake port 30. When the sealing element 4 blocks the air intake pipe 3, the positive pressure air cannot enter the lifting chamber 10. Conversely, the positive pressure air enters the lifting chamber 10 through the air intake pipe 3.

[0073] In the embodiments of this application, such as Figure 1 As shown, the section of the air intake pipe 3 near the positive pressure air intake 30 is vertically arranged, including a sealing section 31 with a gradually decreasing diameter. The sealing section 31 forms a funnel-shaped opening near the positive pressure air intake 30. The sealing element 4 is movably disposed within the sealing section 31 and is configured as a sealing ball 40. The diameter of the sealing ball 40 is larger than the diameter of the smallest diameter of the sealing section 31 but smaller than the diameter of the air intake pipe 3, allowing the sealing ball 40 to rise or fall freely within the sealing section 31, and to block the positive pressure air intake 30 when it falls. In this embodiment, the sealing ball 40 is preferably a silicone ball, the surface of which can closely fit the funnel-shaped opening of the sealing section 31, providing a good sealing effect.

[0074] like Figure 1 As shown, a float 42 is connected to the lower part of the sealing ball 40 via a transmission component 41. The transmission component 41 is configured as a screw with threads at both ends. The sealing ball 40 and the float 42 are respectively inserted through the two ends of the screw, and are fixed to the two ends of the screw by the engagement of two limiting nuts with the threads. The sealing ball 40, the screw, and the float 42 are vertically arranged below the air intake pipe 3. It should be understood that in this embodiment, the maximum buoyancy force that the float 42 can receive is greater than its own weight and the sum of the air pressure and its own weight of the sealing ball 40, to ensure that the float 42 can drive the sealing ball 40 to move upward.

[0075] When the liquid level in the lifting chamber 10 is low or there is no sewage, the float 42 droops due to its own gravity, and the sealing ball 40 moves downward via the screw, blocking the positive pressure air inlet 30. At this time, under the action of the gravity of the float 42 and the positive pressure air pressure, the sealing ball 40 can stably block the positive pressure air inlet 30.

[0076] As the liquid level in the lifting chamber 10 gradually rises, the buoyancy of the float 42 gradually increases. When the liquid level rises to a certain height, the buoyancy of the float 42 is greater than the sum of its own weight and the air pressure on the sealing ball 40. The float 42 begins to float, and the sealing ball 40 rises through the screw. The positive pressure air inlet 30 opens, and positive pressure air begins to enter the lifting chamber 10. As the amount of air entering the lifting chamber 10 increases, the air pressure in the lifting chamber 10 gradually rises, and finally the sewage is discharged from the lifting chamber 10 to the outside of the shell 1 through the air lifting pipe 5.

[0077] Since the sealing section 31 is vertically arranged, in order to enable the float 42 and the lead screw to drive the sealing ball 40 to move vertically along the length of the sealing section 31, and to open or close the positive pressure air inlet 30 in a timely manner, a limiting member 410 is provided on the inner wall of the housing 1 to limit the movement trajectory of the sealing ball 40, the lead screw, and the float 42. Figure 1 As shown, the limiting component 410 includes a connecting rod and a limiting ring. One end of the connecting rod is welded to the inner wall of the shell 1, and the other end is welded to the limiting ring. The lead screw passes through the limiting ring, and the diameter of the limiting ring is smaller than the outer diameter of the limiting nuts at both ends of the float 42, so that the maximum rising height of the float 42 is the height of the limiting ring.

[0078] The length of the connecting rod is adapted to the position of the air intake pipe 3 at the top of the housing 1, allowing the sealing ball 40, the lead screw, and the float 42 to move vertically. The limiting member 410 is preferably configured in two sets to further ensure that the three components move up and down along the straight line of the two limiting rings.

[0079] In another embodiment, such as Figure 2 As shown, the section of the air intake pipe 3 near the positive pressure air intake port 30 is inclined downwards, and the positive pressure air intake port 30 is configured as a flared opening. The sealing component 4 is configured as a sealing ball 40 with a diameter larger than that of the air intake pipe 3. The transmission component 41 includes a rotating lever and a rotating shaft welded to the inner wall of the housing 1. A through hole is opened in the middle of the rotating lever, and a nut is threaded through the through hole at one end of the rotating shaft away from the housing 1, so that the rotating lever can rotate around the rotating shaft. One end of the rotating lever is fixedly connected to the sealing ball 40 by limiting nuts provided at both ends of the sealing ball 40. The other end is fixedly connected to the float 42 by limiting nuts provided at both ends of the float 42. The path of the sealing ball 40 at one end of the rotating lever rotating around the rotating shaft passes through the positive pressure air intake port 30.

[0080] In order to block the positive pressure air inlet 30 when the sealing ball 40 is not subjected to external force, the sealing ball 40, the rotating lever and the float 42 are inclinedly arranged in a straight line below the positive pressure air inlet 30.

[0081] Combination Figure 2 As shown, when the liquid level in the lifting chamber 10 is lower than the set value or there is no sewage, the float 42 will sag due to its own weight. The rotating lever will reverse the direction and drive the sealing ball 40 to block the positive pressure air inlet 30. In practice, since the positive pressure air inlet 30 has a large air pressure, in order to make the sealing ball 40 stably block the positive pressure air inlet 30, a counterweight can be set on the float 42.

[0082] As the liquid level in the lifting chamber 10 rises, the buoyancy of the float 42 gradually increases. When the buoyancy exceeds a certain value, the rotating lever rotates around the axis. The air pressure at the positive pressure air inlet 30 of the air inlet pipe 3 exceeds the thrust of the rotating lever on the sealing ball 40, and the positive pressure air inlet 30 opens, allowing positive pressure air to enter the lifting chamber 10.

[0083] In this embodiment of the application, the rotating shaft is preferably set as the end of the rotating lever close to the sealing ball 40. By utilizing the lever principle, the end of the rotating lever close to the float 42 forms a force-saving lever. On the one hand, the float 42 can overcome a small resistance to drive the rotating lever to rotate. On the other hand, the displacement of the sealing ball 40 is reduced, so that the sealing ball 40 can close or open the positive pressure air inlet 30 in time.

[0084] like Figure 2 As shown, in this embodiment, the float 42 is preferably a long cylindrical float, such as a foam block or a hollow plastic ball. In practice, the above two sealing methods also have the following beneficial effects: Due to the weight of the float 42 and the sealing ball 40, the float 42 will only rise momentarily when the liquid level in the lifting chamber 10 rises to a certain height. After rising, the sewage in the lifting chamber 10 is quickly discharged, and the float 42 slowly descends to its initial position, and the sealing ball 40 seals the air inlet pipe 3 again. Thus, the float 42 can be prevented from repeatedly floating up and down at a certain liquid level.

[0085] like Figure 2 and combined Figure 6 As shown, one end of the airlift pipe 5 is connected to the gravity drainage pipe 92 outside the housing 1, and the other end extends into the bottom area of ​​the lifting chamber 10 to form a sewage lifting port 50. An airlift air inlet assembly 6 is provided on the airlift pipe 5 to mix the positive pressure air with the sewage in the lifting chamber 10 to form a gas-liquid mixture.

[0086] Because the density of the gas-liquid mixture is less than the density of the sewage in the external gravity drainage pipe 92, the gas-liquid mixture is lifted into the external gravity drainage pipe 92. At the same time, the relative height of the air lifting device is lower than the height of the external gravity drainage pipe 92. The gravity drainage pipe 92 exerts an upward pressure on the sewage in the air lifting device due to the siphon effect, which further causes the sewage in the lifting chamber 10 to be collected into the external gravity drainage pipe 92, thus achieving the effect of collecting sewage by using gas lifting.

[0087] In the embodiments of this application, such as Figure 2 As shown, the air-lift intake assembly 6 is configured as a bent air intake pipe 61. One end of the bent air intake pipe 61 is connected to the lower part of the air-lift pipe 5 near the sewage lifting port 50, and the other end extends upward to the top area of ​​the lifting chamber 10. To prevent sewage in the lifting chamber 10 from entering the bent air intake pipe 61, the height of the upper air intake of the bent air intake pipe 61 is not lower than the maximum height of the liquid level in the lifting chamber 10, that is, the maximum floating height of the float 42.

[0088] like Figure 3 As shown, a pressure regulating component 7 is provided on a section of the air intake pipe 3 that connects to the external positive pressure air pipe 91. In this embodiment, it is configured as a control ball valve, including a hemispherical valve core and a pressure regulating rod 70 connected to the arc surface of the hemispherical valve core. When the pressure regulating rod 70 of the control ball valve is in a horizontal state, the plane of the hemispherical valve core and the inner wall of the pipe form an air passage that widens from top to bottom. When the pressure regulating rod 70 of the control ball valve moves upward, the plane of the hemispherical valve core tends to abut against the inner wall of the pipe, and the air passage narrows, reducing the airflow to the positive pressure air intake 30. When the pressure regulating rod 70 of the control ball valve moves downward, the plane of the hemispherical valve core tends to be parallel to the inner wall of the pipe, and the air passage is in the maximum open state, increasing the airflow to the positive pressure air intake 30.

[0089] The amount of positive pressure air supplied to the air inlet pipe 3 can be adjusted by moving the air pressure regulating rod 70 up and down. Combined with the opening of the positive pressure air inlet 30 by the sealing ball 40, the amount of positive pressure air supplied to the lifting chamber 10 can be regulated. When a large amount of positive pressure air is supplied, it can mix with the sewage to form a gas-liquid mixture with a lower density, thereby lifting the sewage to a higher height. Therefore, when the lifting device is installed at different depths in the underground sewage tank, the required lifting height of the sewage can be adapted by adjusting the air pressure regulating component 7.

[0090] Under the combined effect of siphon effect and air lift effect, the sewage in the lifting chamber 10 will be quickly lifted out of the lifting chamber 10 by the air lift pipe 5. The sewage will continuously enter the lifting chamber 10 through the inlet 11. The compressed gas will be consumed in large quantities, and the air pressure in the lifting chamber 10 will drop suddenly. If the air pressure in the lifting chamber 10 cannot be adjusted in time, the sewage discharge speed will gradually decrease, and the sewage may even flow back into the lifting chamber 10 from the air lift pipe 5.

[0091] In order to adjust the air pressure in a timely manner, maintain the stability of the air pressure in the lifting chamber 10, and ensure the discharge speed of sewage, such as Figure 3 As shown, a pressure balancing assembly 8 is provided at the top of the housing 1 near the air intake pipe 3. In this embodiment, the pressure balancing assembly 8 includes a cylindrical piston cylinder 81, which is fixedly mounted on and connected to the housing 1. A piston 82 is slidably disposed inside the piston cylinder 81. A telescopic rod 83 is fixedly connected above the piston 82. The end of the telescopic rod 83 away from the piston 82 passes through the piston cylinder 81 and is rotatably connected to a transmission rod 84 via a rotating shaft. The end of the transmission rod 84 away from the telescopic rod 83 is rotatably connected to the end of the pressure regulating rod 70 of the pressure regulating assembly 7 via a rotating shaft. To ensure the sealing effect of the housing 1, a sealing gasket is provided between the telescopic rod 83 and the piston cylinder 81.

[0092] Through the above scheme, when the sewage in the lifting chamber 10 is quickly discharged and the pressure inside the lifting chamber 10 drops sharply, the piston 82 causes the air pressure regulating rod 70 of the control ball valve to rotate downward via the telescopic rod 83 and the transmission rod 84, widening the air passage and increasing the speed at which positive pressure air is delivered into the lifting chamber 10; when the pressure inside the lifting chamber 10 suddenly increases, such as when a large amount of sewage suddenly rushes into the lifting chamber 10 during drainage, the piston 82 causes the air pressure regulating rod 70 of the control ball valve to rotate upward via the telescopic rod 83 and the transmission rod 84, narrowing the air passage and reducing the amount of positive pressure air delivered into the lifting chamber 10, thereby playing a role in timely regulating and stabilizing the air pressure in the lifting chamber 10, ensuring that the sewage can be discharged quickly and efficiently from the air lifting pipe 5.

[0093] Example 2

[0094] like Figure 4 As shown, the difference from Embodiment 1 is that the air-lifting air intake assembly 6 is configured as multiple rectifier air pipes 62 connected to the air intake pipe 3. One end of the rectifier air pipe 62 is connected to a section below the sealing ball 40 of the air intake pipe 3, and the other end is connected to the air-lifting pipe 5. This allows positive pressure air to directly enter the air-lifting pipe 5 through the rectifier air pipe 62, preventing sewage from entering through the opening of the air-lifting air intake assembly 6 when the liquid level in the lifting chamber 10 rises too quickly, thus preventing the formation of a gas-liquid mixture and causing the air-lifting device to fail.

[0095] Multiple rectifier air pipes 62 are arranged from top to bottom along the length of the air lifting pipe 5 and extend into the air lifting pipe 5 and bend upward to form multiple air lifting inlets. The number of rectifier air pipes 62 is preferably three, and the lower rectifier air pipe 62 is located near the sewage lifting port 50 of the air lifting pipe 5.

[0096] The lower air lift inlet is designed as a slug-flow inlet, with a bubble generating plate 621 at its opening. Large bubbles are blown into the air lift pipe 5, mixing with the sewage to form a slug-flow. The upper air lift inlet is designed as a cluster-flow inlet, with a microbubble generating plate 622 at its opening. The microbubble generating plate 622 is cross-shaped, allowing the gas-liquid mixture to pass through the gaps in the cross-shaped plate without affecting the lifting of solids in the sewage. The downward-facing surface is an inverted triangle, and the diameter of the air holes on the microbubble generating plate 622 is smaller than that on the bubble generating plate 621. The inverted triangle surface cuts the slug-flow into a cluster-flow that is easier to lift. At the same time, it can replenish air into the air lift pipe 5, delivering microbubbles to transform the primary state of the cluster-flow into a higher state, making it easier for the cluster-flow to exit the air lift pipe 5.

[0097] Example 3

[0098] The difference from Embodiment 1 and Embodiment 2 is that, as Figure 5 As shown, in this embodiment, the inlet 11 is located at the bottom of the housing 1, and the check valve 2 is configured as a movable cover 21 whose size is adapted to the inlet 11. One side of the movable cover 21 is rotatably connected to the inner wall of the housing 1 near the inlet 11 via a hinge. When the movable cover 21 is not subjected to external force, it covers the inlet 11. When the air-lift device is placed in water, the water flow will push open the movable cover 21 and enter the lifting chamber 10. The above-mentioned structure is simple and stable, suitable for open sewage tanks, and does not require an external inlet pipe 110, saving costs.

[0099] Based on the aforementioned automatic on / off type air-lift device, this application also proposes a wastewater treatment system, such as... Figure 6 As shown, it includes an air compressor 90, which includes an air compressor and a compressed air storage tank. It is connected to the air inlet pipe 3 of the automatic opening and closing type air lifting device described in Embodiment 1 or Embodiment 2 through a positive pressure air pipeline 91 buried underground. The water inlet 11 of the air lifting device is directly or indirectly connected to the user's water supply through the water inlet pipe 110. One end of the air lifting pipe 5 of the air lifting device located outside the shell 1 is connected to a gravity drainage pipe 92. The end of the gravity drainage pipe 92 is connected to a sewage treatment device 93 for centralized recycling and treatment of sewage.

[0100] The gravity drainage pipe 92 is pre-buried at a depth of about 50cm underground and is set along the riverbank with a slope of 0.15-0.3% so that sewage can flow to the terminal sewage treatment equipment 93 by gravity. In this embodiment of the application, the slope is preferably 0.2%.

[0101] The air lifting device can be installed underground at different depths. By adjusting the air pressure through the air pressure regulating component 7, the sewage can be lifted to the same height to adapt to sewage outlets at different depths along the riverbank, thereby increasing the applicability of the sewage treatment system.

[0102] The above description is merely a preferred embodiment of this application. The scope of protection of this application is not limited to the above embodiments. All technical solutions falling within the scope of this application's concept are within the scope of protection of this application. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of this application should also be considered within the scope of protection of this application.

Claims

1. An automatic opening and closing type air lifting device, comprising a housing (1), wherein a lifting cavity (10) is formed inside the housing (1), characterized in that, The housing (1) is provided with a water inlet (11), and a check device (2) is provided at the water inlet (11) to prevent sewage from flowing back into the lifting chamber (10); An air intake pipe (3) is connected to the shell (1). One end of the air intake pipe (3) is connected to the lifting cavity (10) to form a positive pressure air intake port (30), and the other end is connected to an external positive pressure air pipeline. A sealing element (4) is provided near the positive pressure air intake port (30) of the air intake pipe (3). The sealing element (4) is connected to a float (42) floating in the lifting cavity (10) via a transmission element (41). An air-lift pipe (5) is also connected to the shell (1). One end of the air-lift pipe (5) extends into the bottom area of ​​the lifting chamber (10) to form a sewage lifting port (50), and the other end is connected to the gravity drainage pipe outside the shell (1). An air-lift air intake assembly (6) is provided on the air-lift pipe (5). The opening height of the air lift air intake component (6) is not lower than the maximum floating height of the float (42); When the liquid level in the lifting chamber (10) is at the first height, the float (42) floats up and drives the sealing component (4) to move via the transmission component (41), opening the positive pressure air inlet (30); When the liquid level in the lifting chamber (10) is at the second height, the float (42) moves down and drives the sealing member (4) to move via the transmission member (41) to seal the positive pressure air inlet (30); The air intake pipe (3) is provided with an air pressure regulating component (7), which is configured as a control ball valve. The control ball valve includes a hemispherical valve core and an air pressure regulating rod (70) connected to the arc surface of the hemispherical valve core. The air lifting device is also equipped with an air pressure balancing component (8) for stabilizing the air pressure inside the lifting chamber (10). The air pressure balancing component (8) is connected to the air pressure regulating component (7) in a transmission manner, and controls the action of the air pressure regulating component (7) in response to the change in air pressure in the lifting chamber (10). The air pressure balancing assembly (8) includes a piston cylinder (81) disposed on the housing (1) and connected to the lifting chamber (10), a piston (82) slidably disposed in the piston cylinder (81), a telescopic rod (83) slidably disposed along the axial direction of the piston cylinder (81) and sealed, and a transmission rod (84) whose two ends are rotatably connected to the air pressure regulating rod (70) and the telescopic rod (83) respectively. One end of the telescopic rod (83) is fixedly connected to the piston (82), and the other end is rotatably connected to the end of the transmission rod (84) away from the air pressure regulating rod (70).

2. The automatic opening and closing type airlift device according to claim 1, characterized in that, The section of the air intake pipe (3) near the positive pressure air intake (30) is vertically arranged and configured as a sealing section (31) with a gradually decreasing inner diameter; The sealing element (4) is configured as a sealing ball (40) and is movably disposed within the sealing section (31); The transmission component (41) includes a lead screw, one end of which is fixedly connected to the sealing ball (40), and the other end extends vertically downward and is fixedly connected to the float (42); When the liquid level in the lifting chamber (10) is at the first height, the float (42) floats up and drives the sealing ball (40) to move up through the screw, opening the positive pressure air inlet (30); When the liquid level in the lifting chamber (10) is at the second height, the float (42) moves down and drives the sealing ball (40) to move down via the screw, blocking the positive pressure air inlet (30).

3. The automatic opening and closing type airlift device according to claim 2, characterized in that, At least one limiting member (410) is connected to the inner wall of the housing (1). The limiting member (410) includes a connecting rod with one end connected to the inner wall of the housing (1) and a limiting ring connected to the other end of the connecting rod. The lead screw passes through the limiting ring.

4. The automatic opening and closing type airlift device according to claim 1, characterized in that, The section of the air intake pipe (3) near the positive pressure air intake (30) is inclined downward; The sealing element (4) is configured as a sealing ball (40) whose shape and size are adapted to the opening of the positive pressure air inlet (30). The transmission component (41) includes a rotating lever and a rotating shaft fixedly connected to the inner wall of the housing (1). The rotating lever is rotatably connected to the rotating shaft at its middle position. One end of the lever is fixedly connected to the sealing ball (40), and the other end is fixedly connected to the float (42). The positive pressure air inlet (30) is located on the rotation path of the sealing ball (40). When the liquid level in the lifting chamber (10) is at the lowest liquid level height, the float (42) is located at the lowest point, and the sealing ball (40) blocks the positive pressure air inlet (30); When the liquid level in the lifting chamber (10) exceeds the critical liquid level height, the float (42) drives the rotating lever to rotate, which in turn drives the sealing ball (40) to open the positive pressure air inlet (30).

5. The automatic opening and closing type airlift device according to any one of claims 2-4, characterized in that, The air lift intake assembly (6) includes a bent intake pipe (61), one end of which is connected to the air lift pipe (5) near the sewage lift port (50), and the other end extends upward to the top area of ​​the lift chamber (10), with the opening height not lower than the maximum floating height of the float (42).

6. The automatic opening and closing type airlift device according to any one of claims 2-4, characterized in that, The air lift intake assembly (6) includes multiple rectifier air pipes (62) connected to the intake pipe (3). One end of each rectifier air pipe (62) is connected to the intake pipe (3) and the connection position is located between the sealing point of the sealing member (4) and the positive pressure intake port (30). The other end extends into the air lift pipe (5) and bends upward, forming multiple air lift intake ports from top to bottom inside the air lift pipe (5).

7. The automatic opening and closing type airlift device according to claim 6, characterized in that, The air lift inlet located below the air lift pipe (5) is configured as a slug-shaped air inlet, and a bubble generating plate (621) is provided at its opening. The air lift-up air inlet located above the bullet-shaped air inlet is configured as a cluster-shaped air inlet, and its opening is provided with a microbubble generating plate (622) with an air hole diameter smaller than that of the bubble generating plate (621).

8. The automatic opening and closing type airlift device according to claim 7, characterized in that, Each of the multiple microbubble generating plates (622) located above the bubble generating plate (621) is provided with at least one cutting surface for cutting the bouncy flow in the air lifting pipe (5) into a cluster flow.

9. The automatic opening and closing type airlift device according to claim 1, characterized in that, The inlet (11) is located on the side wall of the housing (1) near the bottom area and is connected to an inlet pipe (110). The check valve (2) includes a check valve installed on the inlet pipe (110).

10. The automatic opening and closing type airlift device according to claim 1, characterized in that, The inlet (11) is located at the bottom of the housing (1). The check valve (2) is configured as a movable cover (21) located inside the housing (1) and whose shape and size are adapted to the inlet (11). One side of the movable cover (21) is rotatably connected to the inner wall of the housing (1), so that the movable cover (21) covers the inlet (11) under its own weight.

11. A wastewater treatment system, characterized in that, Includes an air compressor (90), a positive pressure air pipeline (91), a gravity drainage pipeline (92), a sewage treatment device (93) installed at the end of the gravity drainage pipeline (92), and a plurality of automatic opening and closing air lifting devices as described in any one of claims 1-10; The air inlet pipe (3) of the automatic opening and closing type air lifting device is connected to the positive pressure air pipe (91), the water inlet (11) is connected to the user's water supply, and the end of the air lifting pipe (5) located outside the shell (1) is connected to the gravity drainage pipe (92).

12. The wastewater treatment system according to claim 11, characterized in that, The pressure of the positive pressure air pipeline (91) connected to the air intake pipeline (3) is set to 0.2-0.5 MPa, and the slope of the gravity drainage pipeline (92) is set to 0.15-0.3%.

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