An ecological dredging device of gas lift pump

Abstract

The utility model relates to a kind of pneumatic pump ecological dredging system, including first air lift pump, second air lift pump behind first air lift pump and with the fixed connection of second air lift pump soil breaking device, air lift pump ecological dredging device is moved forward in water and carries out dredging operation, during forward dredging operation, first air lift pump first surface layer organic matter soil under water, floating mud, flow mud and silt suction and lift discharge outside water body, expose lower layer hard bottom mud;Then soil breaking device loosens and breaks exposed lower layer hard bottom mud;Finally, second air lift pump suction hard bottom mud after loosening and breaking by soil breaking device and lift discharge outside water body.The utility model is improved by the existing air lift pump dredging device, which can effectively prevent the diffusion pollution of bottom mud during dredging, and can also efficiently remove hard bottom mud, using air lift pump to realize real ecological environmental protection dredging.

Description

Technical Field

[0001] This utility model relates to a dredging and silt removal device, specifically to an aerodynamic device that uses an air lift pump for ecological silt removal. Background Technology

[0002] An air lift pump, also known as an air lift pump or air lift pump, is a pneumatic dredging device that injects compressed air into a lift pipe to reduce the density of the fluid inside the pipe. It uses the pressure difference caused by the difference in fluid density inside and outside the lift pipe to suck up sludge from the bottom of the water and lift it to the surface.

[0003] However, when performing dredging operations, air lift pumps utilize the pressure difference caused by the difference in fluid density inside and outside the lift pipe to suck up silt. This method is very effective for sucking up and removing bottom silt, flowing mud, and floating mud. However, for dredging operations involving hard bottom mud, it is not possible to achieve the effect of sucking hard bottom mud to the surface simply by relying on suction pressure.

[0004] To improve the dredging efficiency of hard sediment, a rotating cutter is typically added to the lower end of the air-lift pump's suction inlet when using air-lift pumps to break up the hard sediment. While this increases the dredging efficiency, the rotation of the cutter causes the spread of surface floating mud and silt in the water, failing to achieve the goal of ecological dredging. Furthermore, to achieve effective breaking up of hard sediment, the cutter's rotation speed is usually quite high, exceeding the initial flow velocity of the sediment. This results in the spread of not only the surface floating mud but also the broken hard sediment, causing secondary pollution of the water and failing to achieve the goal of ecological dredging. Summary of the Invention

[0005] In summary, the purpose of this invention is to provide an air-lift pump-based ecological dredging device that utilizes a negative pressure suction method to perform stratified treatment of the bottom sediment layer, thereby achieving eco-friendly dredging of water bodies containing hard bottom sediment. This device effectively dredges hard bottom sediment in environmentally friendly dredging projects while ensuring that the dredged sediment does not spread into surrounding water bodies, preventing secondary pollution and achieving truly eco-friendly dredging.

[0006] The objective of this utility model is achieved through the following technical solution: An air-lift pump ecological dredging device includes a first air-lift pump, a second air-lift pump located behind the first air-lift pump, and a soil-breaking device fixedly connected to the second air-lift pump. The first air-lift pump, from top to bottom, includes a first air-lift pipe, a first air-lift head, and a first sludge suction port. The second air-lift pump, from top to bottom, includes a second air-lift pipe, a second air-lift head, and a second sludge suction port. The air-lift pump ecological dredging device moves forward in the water body to perform dredging operations. During the forward dredging operation, the first air-lift pump first sucks up and discharges the surface organic soil, floating mud, flowing mud, and silt from the bottom of the water body, exposing the underlying hard bottom mud. Then, the soil-breaking device loosens and breaks up the exposed underlying hard bottom mud. Finally, the second air-lift pump sucks up and discharges the hard bottom mud loosened and broken by the soil-breaking device from the water body.

[0007] Furthermore, the soil-breaking device includes a cantilever connected to the second air-lift pump, a vertical cutter shaft mounted on the cantilever, a drive mechanism directly connected to the upper end of the cutter shaft, and at least two cutter teeth distributed radially around the vertical cutter shaft. The rotational linear velocity of the cutter teeth at the maximum circumference is less than the starting flow velocity of the bottom mud to be removed.

[0008] Furthermore, the reamer teeth are arc-shaped teeth, with the side facing the bottom mud being a concave arc-shaped surface. The cutting force of the arc-shaped teeth on the bottom mud drives the bottom mud to move towards the center position of the arc-shaped teeth.

[0009] Furthermore, the soil-breaking device is located in front of the suction port of the second air-lift pump, and at least a portion of the cutter teeth extend directly below the suction port of the second air-lift pump.

[0010] Furthermore, the first air lift pipe is connected to the surface dredging vessel via a first lifting mechanism, and the distance between the suction port of the first air lift pump and the bottom mud surface can be adjusted by the lifting action of the first lifting mechanism; the second air lift pipe is connected to the surface dredging vessel via a second lifting mechanism, and the distance between the suction port of the second air lift pump and the bottom mud surface can be adjusted by the lifting action of the second lifting mechanism.

[0011] Furthermore, a first turbidity meter is installed near the bottom of the first air-lift pump to detect the turbidity of the water near the sludge inlet of the first air-lift pump; a second turbidity meter is installed near the bottom of the second air-lift pump to detect the turbidity of the water near the sludge inlet of the second air-lift pump.

[0012] Furthermore, the first air lift pump is also equipped with a first mud concentration meter to detect the concentration of mud pumped by the first air lift pump; the second air lift pump is also equipped with a second mud concentration meter to detect the concentration of mud pumped by the second air lift pump.

[0013] Furthermore, the reamer shaft has a hollow cavity inside, and an ultrasonic transducer is installed inside the hollow cavity.

[0014] Furthermore, the air-lift pump ecological dredging device is composed of multiple first air-lift pumps, second air-lift pumps, and soil-breaking devices arranged in a horizontal array perpendicular to the dredging direction.

[0015] This utility model discloses an air-lift pump ecological dredging device. It utilizes two air-lift pumps, one at the front and one at the back, employing negative pressure suction technology and a layered dredging process. First, the first air-lift pump at the front removes the easily flowing surface sludge. Next, a cutter, aided by ultrasonic waves, loosens and breaks up the exposed hard bottom sediment. Finally, the second air-lift pump at the rear removes the broken hard bottom sediment from the water body. This utility model, through technical improvements to existing air-lift pump dredging devices, effectively prevents the spread and pollution of bottom sediment during dredging and efficiently removes hard bottom sediment, achieving truly ecological and environmentally friendly dredging using air-lift pumps. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural view of Embodiment 1 of this utility model.

[0017] Figure 2 This is a right view of Embodiment 1 of this utility model.

[0018] Figure 3 This is a utility model Figure 1 A magnified view of point A in the image.

[0019] Figure 4 This is a utility model Figure 2 A magnified view of section B in the image.

[0020] Figure 5 This is a top view of Embodiment 1 of this utility model.

[0021] Figure 6 This is a partial cross-sectional view near the air lift head of the first air lift pump in Embodiment 1 of this utility model.

[0022] Figure 7 This is a partial cross-sectional view of the auger shaft in Embodiment 1 of this utility model.

[0023] Figure 8 This is a perspective view of the lifting mechanism in Embodiment 1 of this utility model.

[0024] Figure 9 This is a three-dimensional structural view of Embodiment 2 of this utility model.

[0025] Figure 10 This is the front view of Embodiment 2 of this utility model. Detailed Implementation

[0026] The following description, in conjunction with the accompanying drawings, further illustrates an air-lift pump-based ecological dredging device of this utility model.

[0027] Example 1, see appendix Figure 1-8 An air-lift pump ecological dredging device includes a first air-lift pump 100, a second air-lift pump 200 located behind the first air-lift pump, and a soil-breaking device 300 fixedly connected to the front of the second air-lift pump.

[0028] The first air lift pump 100 includes, from top to bottom, a first air lift pipe 110, a first air lift head 120, and a first sludge suction port 130; the first air lift head 120 is a hollow ring surrounding the outer wall of the lower end of the first air lift pipe 110, and the outer wall of the first air lift head 120 has an opening that communicates with the first air delivery pipe 140; the inner wall 121 of the first air lift head is part of the outer wall of the lower end of the first air lift pipe 110, and eight air delivery holes 122 are evenly distributed along the circumference of the inner wall 121 of the first air lift head. The second air lift pump 200 includes, from top to bottom, a second air lift pipe 210, a second air lift head 220, and a second sludge suction port 230; the second air lift head 220 is a hollow ring surrounding the outer wall of the lower end of the second air lift pipe 210, and the second air lift head 220 has an opening that communicates with the second air delivery pipe 240; the inner wall 221 of the second air lift head is part of the outer wall of the lower end of the second air lift pipe 210, and eight air delivery holes 222 are evenly distributed along the circumference of the inner wall 221 of the second air lift head.

[0029] In this embodiment, both the first air lift pipe 110 and the second air lift pipe 210 are composed of two hollow pipes joined together by flanges. The number of hollow pipes joined depends on the water depth to be dredged; different water depths allow for different numbers of joints.

[0030] A first connecting seat 111 is connected to the upper outer wall of the first air lift pipe 110. The first connecting seat 111 is connected to the upper outer wall of the first air lift pipe 110 by a clamp. The first connecting seat 111 is connected to the first hydraulic rod 151 by bolts. The first hydraulic rod 151 and the first oil cylinder 152 together form the first lifting mechanism 150. The first oil cylinder 152 is fixed to the base 400 by bolts. The base 400 is fixedly connected to the hull of the water surface dredging vessel (not shown in the figure). The distance between the first air lift pump suction port 130 and the bottom mud surface can be adjusted by the lifting action of the first hydraulic rod 150, so that the first air lift pump can obtain the best dredging concentration.

[0031] A second connecting seat 211 is connected to the upper outer wall of the second air lift pipe 210. The second connecting seat 211 is connected to the upper outer wall of the second air lift pipe 210 by a clamp. The second connecting seat 211 is connected to the second hydraulic rod 251 by bolts. The second hydraulic rod 251 and the second oil cylinder 252 together form the second lifting mechanism 250. The second oil cylinder 252 is fixed to the base 400 by bolts. The lifting action of the second hydraulic rod 250 can adjust the distance between the sludge suction port 230 of the second air lift pump and the mud surface at the bottom of the water, so that the second air lift pump can obtain the optimal sludge concentration.

[0032] The first lifting mechanism 150 and the second lifting mechanism 250 can also be other linear drive mechanisms such as electric push rods, linear motors, rotary motors driven by gears and racks.

[0033] A first turbidity meter 160 is installed on the outer wall of the first air lift pump suction port 130 to detect the turbidity of the water near the first air lift pump suction port 300; a second turbidity meter 260 is installed on the outer wall of the second air lift pump suction port 230 to detect the turbidity of the water near the second air lift pump suction port 230.

[0034] The upper end of the first air lift pipe 110 is connected to a first mud concentration meter 170 to detect the concentration of mud pumped by the first air lift pump 100. One end of the first mud concentration meter 170 is connected to the first air lift pipe 110, and the other end is connected to the first mud discharge pipe 180. The first mud concentration meter 170 can also be installed in the pipeline of the first mud discharge pipe 180.

[0035] The upper end of the second air lift pipe 210 is connected to a second mud concentration meter 270 to detect the concentration of mud pumped by the second air lift pump 200. One end of the second mud concentration meter 270 is connected to the second air lift pipe 210, and the other end is connected to the second mud discharge pipe 280. The second mud concentration meter 270 can also be installed in the pipeline of the second mud discharge pipe 280.

[0036] The soil-breaking device 300 includes a cantilever 310 fixedly connected to the front end of the outer wall of the second suction port 230, a vertical reamer shaft 320 mounted on the cantilever 310, a drive mechanism 340 directly connected to the upper end of the reamer shaft, and three arc-shaped reamer teeth 330 radially distributed along the vertical reamer shaft 320. The rotational linear velocity of the reamer teeth 330 at the tooth tip is less than the starting flow velocity of the bottom mud to be removed. The drive mechanism 340 can be a hydraulic pump or a submersible variable frequency motor.

[0037] The reamer tooth 330 is an arc-shaped tooth made of wear-resistant alloy, preferably stainless steel wear-resistant alloy. The side of the reamer tooth 330 facing the bottom mud is a concave arc-shaped surface. The cutting force of the arc-shaped tooth on the bottom mud drives the bottom mud to move towards the center of the arc-shaped tooth. The tip of the reamer tooth 330 extends directly below the suction port 230 of the second air lift pump.

[0038] The reamer shaft 320 is a steel tube with a tapered closed end face at the lower end, preferably made of stainless steel. Its interior is a hollow cavity 321, within which an ultrasonic transducer 322 is installed. The outer surface of the ultrasonic transducer 322 is in close contact with the inner surface of the hollow cavity 321, ensuring that the ultrasonic vibration energy emitted by the ultrasonic transducer 322 is effectively transmitted to the reamer teeth 330. The ultrasonic transducer 322 is connected to an ultrasonic generator (not shown in the figure) on the surface dredging vessel via a cable. The ultrasonic frequency is continuously adjustable between 30kHz and 100kHz to adapt to different types of bottom sediment.

[0039] The aforementioned air-lift pump ecological dredging device also includes a control module (not shown in the figure) on the surface dredging vessel. The control module comprises an information acquisition unit, an information display unit, and an information control unit. The information acquisition unit collects concentration information from the concentration meter and turbidity information from the turbidity meter, and transmits this information to the information display unit, converting it into digital information for the operator. The information control unit analyzes the concentration and turbidity information from the concentration meter and turbidity meter, and automatically adjusts (or allows the operator to manually input parameters) the lifting height of the air-lift pump's lifting mechanism, the rotation speed of the soil-breaking device's drive mechanism, and the ultrasonic frequency of the ultrasonic transducer to achieve the best dredging effect.

[0040] The working process of the air-lift pump ecological dredging device in Embodiment 1 of this utility model is as follows: When carrying out dredging operations, the air lift pump is first lowered into the water. By controlling the number of splices of the first air lift pipe 110 and the second air lift pipe 210, the clamping position of the first connecting seat 111 on the outer wall of the first air lift pipe 110 and the clamping position of the second connecting seat 211 on the outer wall of the second air lift pipe 210 are adjusted. The lifting height of the first lifting mechanism 150 and the second lifting mechanism 250 are then corrected so that the sludge suction port 130 of the first air lift pump and the sludge suction port 230 of the second air lift pump are in appropriate positions with the mud surface at the bottom of the water. Then, the air lift pump ecological dredging device is moved forward in the water to carry out dredging operations. During the forward dredging operation, the first air lift pump 100 first sucks up and discharges the surface organic soil, floating mud, flowing mud and silt from the bottom of the water body, exposing the underlying hard bottom mud; then the soil breaking device 300 loosens and breaks up the exposed underlying hard bottom mud; finally, the second air lift pump 200 sucks up the hard bottom mud that has been loosened and broken by the soil breaking device 300 and discharges it from the water body.

[0041] like Figure 1 As shown, the arc-shaped reamer teeth 330 rotate clockwise to cut and peel off the exposed hard mud, while simultaneously pushing the peeled mud towards the center of the arc of the reamer teeth to prevent the broken mud from spreading outwards. At the same time, the ultrasonic transducer 322 located inside the reamer shaft 320 emits ultrasonic waves, which assist the reamer teeth 330 in loosening and breaking up the hard mud through high-frequency vibration. This not only makes the hard mud looser and easier to flow, but also effectively prevents the hard mud from adhering to the reamer teeth 330, thereby further reducing the resistance of the reamer teeth cutting into the soil and improving the working efficiency of the reamer teeth.

[0042] When ultrasound acts on bottom sediment, the ultrasonic vibration can cause minute displacements between sediment particles, thereby disrupting the bonds between sediment particles and promoting the dispersion and loosening of sediment particles. In addition, ultrasound can also make sediment particles disperse more evenly in water, thereby accelerating water penetration and making the sediment easier to flow.

[0043] Moreover, when ultrasound acts on the water between sediment particles, it causes cavitation in the water, creating near-vacuum cavities. When these cavities are compressed and collapsed by ultrasound, they can generate high-speed microjets and release shock waves with pressures of tens of megapascals, causing hard sediment to be damaged by impact and break down into fragments or loosen.

[0044] Furthermore, the minerals and organic matter in the sediment undergo changes in their physical properties under the influence of ultrasound, further promoting the loosening of sediment particles. For example, ultrasound can decompose water molecules and... Recombination forms hydrogen bonds, allowing water molecules to form a "hydration film" on the surface of sediment particles, which helps the sediment particles disperse and flow.

[0045] Example 2, see appendix Figure 9-10 An air-lift pump ecological dredging device differs from Embodiment 1 in that: the air-lift pump ecological dredging device is a horizontal array perpendicular to the dredging direction, consisting of five first air-lift pumps 100, five second air-lift pumps 200, and five soil-breaking devices 300. The five first air-lift pumps 100 share a first lifting mechanism 150, and the five second air-lift pumps 200 share a second lifting mechanism 250; the upper openings of the five first air-lift pipes 110 are connected in parallel to the same first sludge discharge pipe 180, and the upper openings of the five second air-lift pipes 210 are connected in parallel to the same second sludge discharge pipe 280. A first concentration meter 170 and a second concentration meter 270 are respectively installed in the first sludge discharge pipe 180 and the second sludge discharge pipe 280.

[0046] The rest of the structure and operation are the same as in Example 1.

[0047] Although the present invention has been described in detail using specific methods, those skilled in the art will understand that various changes can be made without departing from the intent and scope of the present invention.

Claims

1. An air-lift pump ecological dredging device, comprising a first air-lift pump (100), a second air-lift pump (200) located behind the first air-lift pump, and a soil-breaking device (300) fixedly connected to the second air-lift pump, wherein the first air-lift pump (100) comprises, from top to bottom, a first air-lift pipe (110), a first air-lift head (120), and a first sludge suction port (130), and the second air-lift pump (200) comprises, from top to bottom, a second air-lift pipe (210), a second air-lift head (220), and a second sludge suction port (230), characterized in that: The soil-breaking device (300) includes a cantilever (310) connected to a second air-lift pump (200), a vertical cutter shaft (320) mounted on the cantilever (310), a drive mechanism (340) directly connected to the upper end of the cutter shaft, and at least two cutter teeth (330) radially distributed along the vertical cutter shaft (320), wherein the rotational linear velocity of the cutter teeth (330) at the maximum circumference is less than the starting flow velocity of the bottom mud to be removed.

2. The air-lift pump ecological dredging device according to claim 1, characterized in that: The reamer tooth (330) is an arc-shaped tooth, and the side facing the bottom mud is a concave arc-shaped surface. The cutting force of the arc-shaped tooth on the bottom mud drives the bottom mud to move towards the center of the arc-shaped tooth.

3. The air-lift pump ecological dredging device according to claim 1, characterized in that: The soil-breaking device (300) is located in front of the second suction port (230), and at least a portion of the cutter teeth (330) extends directly below the second suction port (230).

4. The air-lift pump ecological dredging device according to claim 1, characterized in that: The first air lift pipe (110) is connected to the dredging vessel via the first lifting mechanism (150). The distance between the first suction port (130) and the bottom mud surface can be adjusted by the lifting action of the first lifting mechanism (150). The second air lift pipe (210) is connected to the dredging vessel via the second lifting mechanism (250). The distance between the second suction port (230) and the bottom mud surface can be adjusted by the lifting action of the second lifting mechanism (250).

5. The air-lift pump ecological dredging device according to claim 1, characterized in that: The first air lift pump (100) is equipped with a first turbidity meter (160) near the bottom to detect the turbidity of the water near the first sludge suction port (130); the second air lift pump (200) is equipped with a second turbidity meter (260) near the bottom to detect the turbidity of the water near the second sludge suction port (230).

6. The air-lift pump ecological dredging device according to claim 1, characterized in that: The first air lift pump (100) is also equipped with a first mud concentration meter (170) to detect the concentration of mud pumped by the first air lift pump (100); the second air lift pump (200) is also equipped with a second mud concentration meter (270) to detect the concentration of mud pumped by the second air lift pump (200).

7. The air-lift pump ecological dredging device according to claim 1, characterized in that: The reamer shaft (320) has a hollow cavity (321) inside, and an ultrasonic transducer (322) is installed inside the hollow cavity (321).

8. The air-lift pump ecological dredging device according to claim 1, characterized in that: The air-lift pump ecological dredging device consists of a horizontal array composed of multiple first air-lift pumps (100), second air-lift pumps (200), and a soil-breaking device (300) arranged perpendicular to the dredging direction.

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