A pneumatic dredging device with jet and gas lift action

Abstract

The invention relates to a pneumatic dredging device with jet flow and gas lift function, mainly comprising a pneumatic pump, an air compressor, a gas lift device and a jet flow device; the gas lift device and the jet flow device are connected with the exhaust pipe of the pneumatic pump through pipelines; when the pneumatic pump exhausts, the exhaust enters the jet flow device and the gas lift device respectively; the underwater sediment is broken and scattered under the action of the high-pressure gas jet flow of the jet flow device; part of the sediment is discharged from the water body under the gas lift action of the gas lift device; another part of the sediment enters the pneumatic pump under the action of the ambient water pressure when the high-pressure gas in the pneumatic pump is discharged; after the pneumatic pump is filled with the sediment, the air compressor injects high-pressure gas into the pneumatic pump, and the high-pressure gas pushes the sediment in the pneumatic pump to be discharged from the pneumatic pump through a discharge pipe. The pneumatic dredging device with jet flow and gas lift function fully utilizes the exhaust energy of the pneumatic pump, has a simple structure, good dredging effect and high energy utilization rate.

Description

Technical Field

[0001] This invention relates to an underwater dredging and desilting device, specifically a pneumatic desilting device with jet and air-lift functions. Background Technology

[0002] Currently, there are two types of pneumatic equipment used for dredging and silt removal. One type uses compressed air as a piston to pressurize the sludge entering the pump body under the action of water level pressure difference and then pushes it out. The other type uses compressed air injected into a lift pipe, utilizing the pressure difference caused by the difference in liquid density inside and outside the lift pipe to lift the silt from the bottom of the water to the surface. Both types of pneumatic silt removal devices are characterized by simple structure, no easily damaged parts, and safe and reliable operation. Moreover, they do not disturb the clay layer during dredging and silt removal, making them particularly suitable for environmentally friendly dredging and silt removal of rivers, lakes, reservoirs, and other water bodies where the existing water quality cannot be damaged.

[0003] A pneumatic pump typically consists of three individual pumps. Each individual pump comprises three main components: a pump body, a mud conveying pipe, and an air conveying pipe. Its working principle is as follows: the pneumatic pump is forced into the silt at the bottom of the water by its own weight. Under the influence of ambient water pressure, the silt enters the pump body. Once the pump body is full of silt, an air compressor injects compressed air into the pump body through the air conveying pipe. The silt inside the pump body is then discharged from the mud conveying pipe under the pressure of the high-pressure air. After the silt is emptied, the air compressor stops supplying air, and the high-pressure air inside the pump body is discharged into the atmosphere through the air conveying pipe. Then, the silt outside the pump body re-enters the pump body under ambient water pressure. While one individual pump is inlet air and outlet mud, the other two individual pumps are outlet air and inlet mud. The three individual pumps work alternately in a cycle to achieve continuous and stable mud transport. While pneumatic pumps offer advantages such as simple structure and no water pollution during dredging, their high-pressure air is directly released into the atmosphere without generating effective work, resulting in energy waste, low energy utilization, and high energy costs. This is especially true when using pneumatic pumps to transport slurry over long distances via pipelines, where the pressure of the high-pressure air inside the pump is far greater than the ambient water pressure. Directly releasing this high-pressure air into the atmosphere leads to significant energy waste and drastically increases the operating costs of pneumatic pumps. Furthermore, because pneumatic pumps rely on water pressure to force sludge into the pump body, hard clay and gravel from the bottom of the water are not easily brought into the pump body by water pressure. This limits the application of pneumatic pumps to dredging projects involving flowing sludge, making them unsuitable for the gravel dredging work commonly encountered in river and reservoir dredging projects.

[0004] Air-lift pumps suffer from significant energy losses due to the three-phase flow of gas, liquid, and solid within the lift pipe, resulting in an overall energy efficiency of only about 20%. They also exhibit high energy consumption and low energy utilization efficiency. Therefore, a pneumatic dredging and sediment removal device is needed that can improve energy utilization efficiency and is applicable to various dredging conditions. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems by providing a pneumatic dredging device with jet and air-lift effects. To solve these issues, the inventors conducted in-depth research on the working principle and dredging process of existing pneumatic dredging devices. The results showed that combining pressure pumping with air-lift effects, utilizing the high-pressure exhaust from existing pneumatic pumps to generate jet breaking and air-lift effects, is an excellent solution to the problems, thus realizing this invention.

[0006] The objective of this invention is achieved through the following technical solution: A pneumatic dredging device with jetting and air-lifting functions, mainly comprising a pneumatic pump, an air compressor, an air-lifting device, and a jetting device; the pneumatic pump comprises a pump body, an air inlet pipe, an exhaust pipe, and a sludge discharge pipe, the pump body being a hollow cavity with an air vent, a sludge inlet, and a sludge inlet check valve, one end of the air vent being connected to the air inlet pipe and the exhaust pipe respectively; the jetting device comprises a jet generator, a jet nozzle, and a jet air inlet pipe; characterized in that: the air-lifting device and the jetting device are respectively connected to the exhaust pipe of the pneumatic pump; when the pneumatic pump exhausts, the exhaust gas passes through... The vent and exhaust pipe lead into the jetting device and the air-lifting device, respectively. Under the action of the high-pressure gas jet from the jetting device, the sediment at the bottom of the water is broken and dispersed. Some of the sediment is discharged from the water body under the air-lifting action of the air-lifting device, while the other part of the sediment enters the pump body through the mud inlet under the action of the ambient water pressure as the high-pressure gas is discharged from the pump body. After the sediment fills the pump body, the air compressor injects high-pressure gas into the pump body through the air inlet and vent. The mud inlet check valve closes under the push of the gas pressure, and the high-pressure gas pushes the sediment in the pump body to be discharged through the mud discharge pipe.

[0007] Furthermore, a pneumatic dredging device with jet and air-lift functions is characterized in that: the air-lift device is provided with a lifting pipe, an air-lift inlet pipe and at least one air-lift head, and the air-lift head is also provided with an air-lift inlet. The air-lift inlet is connected to the exhaust pipe of the pneumatic pump through the air-lift inlet pipe. During the exhaust process of the pneumatic pump, the high-pressure gas in the pump body enters the lifting pipe through the air inlet, exhaust pipe, air-lift inlet pipe, air-lift inlet, and air-lift head, thereby reducing the density of the water in the lifting pipe. Under the action of the pressure difference between the water inside and outside the lifting pipe, the water in the lifting pipe floats up, and at the same time, it carries the sediment at the bottom of the water to float up and be sprayed out of the water surface.

[0008] Furthermore, a pneumatic dredging device with jet and air lift functions is characterized in that: at least one air lift head of the air lift device is positioned higher than the top of the pump body.

[0009] Furthermore, a pneumatic dredging device with jet and air lift functions is characterized in that: at least one air lift head of the air lift device is at least 5 meters above the top of the pump body.

[0010] Furthermore, a pneumatic sludge removal device with jet and air lift functions is characterized in that: the air lift inlet is also provided with an air lift inlet one-way valve.

[0011] Furthermore, a pneumatic dredging device with jet and air lift functions is characterized in that: the jet generator is a pulse jet generator.

[0012] Furthermore, a pneumatic dredging device with jetting and air-lifting functions is characterized in that: a jetting air inlet check valve is also provided on the jetting air inlet pipe. When the exhaust pressure of the pneumatic pump is higher than the ambient water pressure at the location of the jetting device, part of the exhaust from the pneumatic pump enters the jet generator through the vent, exhaust pipe, and jetting air inlet pipe to generate a jetting effect, and the other part enters the lifting pipe through the vent, exhaust pipe, air-lifting air inlet pipe, air-lifting air inlet, and air-lifting head to generate an air-lifting effect. When the exhaust pressure of the pneumatic pump is lower than the ambient water pressure at the location of the jetting device, the jetting air inlet check valve closes under the action of ambient water pressure, and all the exhaust from the pneumatic pump enters the lifting pipe through the vent, exhaust pipe, air-lifting air inlet pipe, air-lifting air inlet, and air-lifting head to generate an air-lifting effect.

[0013] Furthermore, a pneumatic dredging device with jet and air-lift functions is characterized by: a controller and at least two pneumatic pumps; under the command of the controller, when the air compressor injects high-pressure gas into one of the pneumatic pumps to discharge sludge, the other pneumatic pumps are in a state of exhausting gas and feeding sludge.

[0014] Furthermore, a pneumatic sludge removal device with jet and air lift functions is characterized in that: the pneumatic pump is also equipped with a pneumatic reversing valve, one end of which is connected to the air inlet and the other end is connected to the air inlet pipe and the air outlet pipe respectively; the pneumatic reversing valve controls the air inlet and air outlet sequence of the pneumatic pump according to the time command of the controller.

[0015] Furthermore, a pneumatic sludge removal device with jet and air lift functions is characterized in that: a liquid level sensor is also provided in the pump body, and the controller sends a command to the pneumatic reversing valve to control the air intake and exhaust sequence of the pneumatic pump based on the liquid level signal of the liquid level sensor.

[0016] Furthermore, a pneumatic sludge removal device with jetting and air-lifting functions is characterized in that: the exhaust pipe of the pneumatic pump is also provided with an exhaust reversing valve, one end of which is connected to the exhaust pipe, and the other end is connected to the air-lifting device and the jetting device respectively; the exhaust reversing valve controls the timing of exhaust discharge between the air-lifting device and the jetting device according to the time command issued by the controller.

[0017] Furthermore, a pneumatic sludge removal device with jetting and air-lifting functions is characterized in that: a pressure sensor is also provided on the exhaust pipe of the pneumatic pump, and the controller sends a command to the exhaust reversing valve according to the exhaust pressure of the pneumatic pump to control the timing of exhaust discharge between the air-lifting device and the jetting device.

[0018] This invention discloses a pneumatic dredging device with jet and air lift functions. It utilizes the exhaust of a pneumatic pump to simultaneously generate mud and sand breaking and air lift effects, thereby improving the energy utilization efficiency of the pneumatic pump, increasing its soil breaking capacity, and enhancing its working efficiency. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural view of Embodiment 1 of the present invention.

[0020] Figure 2 This is a front view of Embodiment 1 of the present invention.

[0021] Figure 3 This is a top view of Embodiment 1 of the present invention.

[0022] Figure 4 This is a right view of Embodiment 1 of the present invention.

[0023] Figure 5 This is a three-dimensional structural view of the pneumatic pump according to Embodiment 1 of the present invention.

[0024] Figure 6 This is a schematic diagram of the pneumatic pump according to Embodiment 1 of the present invention.

[0025] Figure 7 This is a three-dimensional structural view of Embodiment 2 of the present invention.

[0026] Figure 8 This is a front view of Embodiment 2 of the present invention.

[0027] Figure 9 This is a top view of Embodiment 2 of the present invention.

[0028] Figure 10 This is the right view of Embodiment 2 of the present invention.

[0029] Figure 11 This is a three-dimensional structural view of Embodiment 3 of the present invention.

[0030] Figure 12 This is a front view of Embodiment 3 of the present invention.

[0031] Figure 13 This is the right view of Embodiment 3 of the present invention.

[0032] Figure 14 This is a three-dimensional structural view of Embodiment 4 of the present invention.

[0033] Figure 15 This is the right view of Embodiment 4 of the present invention.

[0034] Figure 16 This is a front view of Embodiment 4 of the present invention.

[0035] Figure 17This is a top view of Embodiment 4 of the present invention. Detailed Implementation

[0036] The invention will now be further described with reference to the accompanying drawings.

[0037] Example 1, see appendix Figure 1-6 A pneumatic dredging device with jetting and air-lifting functions is mainly composed of three pneumatic pumps 1, an air compressor 2, an air-lifting device 3, a jetting device 4, a controller 5, a pneumatic reversing valve 6, and an exhaust reversing valve 8. Each pneumatic pump 1 is equipped with a pump body 1.1, an air inlet pipe 1.2, an exhaust pipe 1.3, and a sludge discharge pipe 1.4. The pump body 1.1 is a hollow cavity with an air vent 1.1.1, a sludge inlet 1.1.2, and a sludge inlet check valve 1.1.3. The air-lifting device 3 is equipped with a lifting pipe 3.2, an air-lifting inlet pipe 3.3, and two air-lifting heads 3.1. Each air-lifting head 3.1 is equipped with an air-lifting inlet 3.1.1 and an exhaust check valve 1.1.1. The air lift inlet pipe 3.3 is connected; the height of the first air lift head is flush with the top of the pump body 1.1, and the position of the second air lift head is 8m higher than the position of the first air lift head; the jet device 4 is equipped with a pulse jet generator 4.1, a jet nozzle 4.2, and a jet inlet pipe 4.3; the pneumatic pump inlet pipe 1.2 connects the air compressor 2 to the pneumatic reversing valve 6; one end of the pneumatic reversing valve 6 is connected to the air inlet 1.1.1, and the other end is connected to the inlet pipe 1.2 and the exhaust pipe 1.3 respectively; one end of the exhaust reversing valve 8 is connected to the jet inlet pipe 4.3 and the air lift inlet pipe 3.3 respectively, and the other end is connected to the exhaust pipe 1.3.

[0038] The working process of Embodiment 1 of the present invention is as follows: When the pump body 1.1 is placed at the bottom of the water and sludge is introduced, the controller 5 controls the pneumatic reversing valve 6 to disconnect the air inlet pipe 1.2 from the vent 1.1.1, and at the same time connect the exhaust pipe 1.3 to the vent 1.1.1. The water pressure pushes open the sludge inlet check valve 1.1.3, and the sludge at the bottom of the water enters the pump body 1.1 through the sludge inlet 1.1.2 under the action of the ambient water pressure. After the controller 5 determines that the pump body 1.1 is full of sludge according to the clock information, it controls the pneumatic reversing valve 6 to disconnect the exhaust pipe 1.3 from the vent 1.1.1 and connect the air inlet pipe 1.2. Connected to vent 1.1.1, air compressor 2 injects high-pressure gas into pump body 1.1 through inlet pipe 1.2, pneumatic reversing valve 6, and vent 1.1.1. The mud inlet check valve 1.1.3 closes under gas pressure, and the high-pressure gas pushes the mud and sand in pump body 1.1 out through mud discharge pipe 1.4. Controller 5, based on clock information, determines that the mud and sand in pump body 1.1 have been emptied, and controls pneumatic reversing valve 6 to disconnect inlet pipe 1.2 from vent 1.1.1, while simultaneously connecting exhaust pipe 1.3 to vent 1.1.1. The high-pressure gas in pump body 1.1 then flows through the vent... 1.1.1. The exhaust pipe 1.3 enters the exhaust reversing valve 8. The controller 5 controls the exhaust reversing valve 8 to first connect the exhaust pipe 1.3 to the jet inlet pipe 4.3. The high-pressure exhaust from the pneumatic pump 1 enters the jet device 4, and the sediment at the bottom of the water is broken up and dispersed under the action of the high-pressure gas pulse jet from the jet device 4. Then, based on the clock information, the controller 5 determines that when the exhaust pressure of the pneumatic pump 1 is lower than the ambient water pressure at the location of the jet device 4, it controls the exhaust reversing valve 8 to disconnect the exhaust pipe 1.3 from the jet inlet pipe 4.3, and at the same time connect the exhaust pipe 1.3 to the air lift inlet pipe 3.3. The high-pressure gas inside pump body 1.1 enters the lifting pipe 3.2 through the vent 1.1.1, exhaust pipe 1.3, air lift inlet pipe 3.3, air lift inlet 3.1.1, and air lift head 3.1. This reduces the density of the water in the lifting pipe 3.2. Under the pressure difference between the inside and outside of the lifting pipe 3.2, the water in the lifting pipe 3.2 floats up, simultaneously carrying some bottom sediment to the surface. At the same time, some bottom sediment will also enter pump body 1.1 through mud inlet 1.1.2 under the influence of ambient water pressure as the high-pressure gas is discharged from pump body 1.1. Through the control of the pneumatic reversing valve 6 by controller 5, when air compressor 2 injects high-pressure gas into one of the pneumatic pumps 1 to discharge mud, the other two pneumatic pumps 1 are in the state of exhausting and feeding mud.

[0039] Example 2, see appendix Figure 7-10A pneumatic dredging device with jetting and air-lifting functions is mainly composed of four pneumatic pumps 1, an air compressor 2, an air-lifting device 3, a jetting device 4, a controller 5, a pneumatic reversing valve 6, a liquid level sensor 7, an exhaust reversing valve 8, and a pressure sensor 9. Each pneumatic pump 1 is equipped with a pump body 1.1, an air inlet pipe 1.2, an exhaust pipe 1.3, and a sludge discharge pipe 1.4. The pump body 1.1 is a hollow cavity with an air vent 1.1.1, a sludge inlet 1.1.2, and a sludge inlet check valve 1.1.3. The air-lifting device... The device 3 is equipped with a lifting pipe 3.2 and three air lifting heads 3.1. Each air lifting head 3.1 has an air lifting inlet 3.1.1 connected to the air lifting inlet pipe 3.3. The first air lifting head is level with the top of the pump body 1.1, the second air lifting head is 5m higher than the first air lifting head, and the third air lifting head is 10m higher than the first air lifting head. The liquid level sensor 7 is installed on the pump body 1.1, and the pressure sensor 9 is installed on the exhaust pipe 1.3. The rest of the structure is the same as in embodiment 1. The difference in its working process from embodiment 1 is that the controller 5 determines whether the mud and sand in the pump body 1.1 is full or empty through the liquid level signal of the liquid level sensor 7, and determines the exhaust pressure and the ambient water pressure at the location of the jet device 4 through the pressure signal of the pressure sensor 9. The rest of the working process is the same as in embodiment 1.

[0040] Example 3, see appendix Figure 11-13 A pneumatic dredging device with jetting and air-lifting functions is mainly equipped with two pneumatic pumps 1, an air compressor 2, an air-lifting device 3, a jetting device 4, a controller 5, and a pneumatic reversing valve 6. The jetting device 4 is equipped with a pulse jet generator 4.1, a jet nozzle 4.2, and a jet inlet pipe 4.3. The jet inlet pipe 4.3 is also equipped with a jet inlet check valve 4.3.1. The rest of the structure is the same as in Embodiment 1. The working process differs from that of Example 1 in that: when the exhaust pressure of the pneumatic pump 1 is higher than the ambient water pressure at the location of the jet device 4, part of the exhaust from the pneumatic pump 1 enters the pulse jet generator 4.1 through the vent 1.1.1, exhaust pipe 1.3, and jet inlet pipe 4.3 to generate a jet effect, while the other part enters the lifting pipe 3.2 through the vent 1.1.1, exhaust pipe 1.3, air lift inlet pipe 3.3, air lift inlet 3.1.1, and air lift head 3.1 to generate an air lift effect; when the exhaust pressure of the pneumatic pump 1 is lower than the ambient water pressure at the location of the jet device 4, the jet inlet check valve 4.3.1 closes under the action of ambient water pressure, and all the exhaust from the pneumatic pump 1 enters the lifting pipe 3.2 through the vent 1.1.1, exhaust pipe 1.3, air lift inlet pipe 3.3, air lift inlet 3.1.1, and air lift head 3.1 to generate an air lift effect. The remaining working process is the same as in Example 1.

[0041] Example 4, see appendix Figure 14-17A pneumatic dredging device with jetting and air-lifting functions is mainly composed of a pneumatic pump 1, an air compressor 2, an air-lifting device 3, and a jetting device 4. The pneumatic pump 1 has a pump body 1.1, an inlet pipe 1.2, an exhaust pipe 1.3, and a sludge discharge pipe 1.4. The pump body 1.1 is a hollow cavity with an air inlet 1.1.1, a sludge inlet 1.1.2, and a sludge inlet check valve 1.1.3. The air-lifting device 3 has a lifting pipe 3.2, an air-lifting inlet pipe 3.3, and two air-lifting heads 3.1. Each air-lifting head 3.1 has an air-lifting inlet 3.1.1 connected to the air-lifting inlet pipe 3.3. Each air-lifting inlet 3.1.1 also has an air-lifting inlet check valve 3.1.1.1. To prevent water in the lifting pipe 3.2 from flowing back into the exhaust pipe 1.3 when the pneumatic pump 1 is not working; the height of the first air lift head is flush with the top of the pump body 1.1, and the position of the second air lift head is 6m higher than the position of the first air lift head; the jet device 4 is equipped with a jet generator 4.1, a jet nozzle 4.2, and a jet inlet pipe 4.3. The jet inlet pipe 4.3 is also equipped with a jet inlet check valve 4.3.1 to ensure that the gas can only flow from the exhaust pipe 1.3 to the jet generator 4.1 in one direction; the inlet pipe 1.2 connects the air compressor 2 to the air inlet 1.1.1, and the exhaust pipe 1.3 connects the air inlet 1.1.1 to the jet inlet pipe 4.3 and the air lift inlet pipe 3.3 respectively.

[0042] The working process is as follows: When the pump body 1.1 is placed at the bottom of the water to allow sludge to enter, the water pressure pushes open the sludge inlet check valve 1.1.3, and the sludge at the bottom of the water enters the pump body 1.1 through the sludge inlet 1.1.2 under the action of the ambient water pressure. After the sludge fills the pump body 1.1, the air compressor 2 is turned on to output high-pressure air; part of the high-pressure air enters the pump body 1.1 through the air inlet pipe 1.2 and the air outlet 1.1.1, and the sludge inlet check valve 1.1.3 is closed under the push of the gas pressure. The high-pressure air pushes the sludge in the pump body 1.1 to be discharged through the sludge discharge pipe 1.4; another part of the high-pressure air enters the jet device 4 and the air lift device 3 through the air inlet pipe 1.2 and the exhaust pipe 1.3 respectively. The sludge at the bottom of the water is broken and dispersed under the action of the high-pressure gas jet of the jet device 4, and part of the sludge is discharged from the water through the lift pipe 3.2 under the air lift action of the air lift device 3. After the sediment in the pneumatic pump body 1.1 is emptied, the air compressor 2 is turned off. The high-pressure air in the pump body 1.1 enters the jet device 4 and the air lift device 3 through the vent 1.1.1 and the exhaust pipe 1.3, respectively. The sediment at the bottom of the water is broken and dispersed under the action of the high-pressure gas jet of the jet device 4. Some of the sediment is discharged from the water body through the lift pipe 3.2 under the action of the air lift device 3, and the other part of the sediment enters the pump body 1.1 under the action of the ambient water pressure as the high-pressure gas in the pump body 1.1 is discharged.

[0043] Although the 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 invention.

Claims

1. A pneumatic sludge removal device with jetting and air-lifting functions, mainly comprising a pneumatic pump (1), an air compressor (2), an air-lifting device (3), and a jetting device (4); the pneumatic pump (1) comprises a pump body (1.1), an air inlet pipe (1.2), an exhaust pipe (1.3), and a sludge discharge pipe (1.4), the pump body (1.1) being a hollow cavity with an air vent ( ). 1.1.1), mud inlet (1.1.2), mud inlet check valve (1.1.3), and one end of vent (1.1.1) is connected to air inlet pipe (1.2) and exhaust pipe (1.3) respectively; the jet device (4) is equipped with jet generator (4.1), jet nozzle (4.2), and jet air inlet pipe (4.3); characterized in that: The air lift device (3) and the jet device (4) are respectively connected to the exhaust pipe (1.3) of the pneumatic pump; when the pneumatic pump (1) exhausts, the exhaust passes through the air inlet ( 1.1.1) The exhaust pipe (1.3) enters the jet device (4) and the air lift device (3) respectively. The sediment at the bottom of the water is broken and dispersed under the action of the high pressure gas jet of the jet device (4). Some of the sediment is discharged from the water body under the action of the air lift device (3). The other part of the sediment enters the pump body (1.1) through the mud inlet (1.1.2) under the action of the ambient water pressure as the high pressure gas in the pump body (1.1) is discharged. After the sediment fills the pump body (1.1), the air compressor (2) injects high pressure gas into the pump body (1.1) through the air inlet (1.2) and the air vent (1.1.1). The mud inlet check valve (1.1.3) is closed under the push of the gas pressure. The high pressure gas pushes the sediment in the pump body (1.1) to be discharged through the mud discharge pipe (1.4).

2. The pneumatic dredging device with jet and air lift functions according to claim 1, characterized in that: The air lift device (3) is provided with a lifting pipe (3.2), an air lift inlet pipe (3.3), and at least one air lift head (3.1). The air lift head (3.1) is also provided with an air lift inlet (3.1.1). The air lift inlet (3.1.1) is connected to the pneumatic pump exhaust pipe (1.3) through the air lift inlet pipe (3.3). During the exhaust process of the pneumatic pump (1), the high-pressure gas in the pump body (1.1) passes through the vent (3.1.1). 1.1.1) The exhaust pipe (1.3), air lift inlet pipe (3.3), air lift inlet (3.1.1), and air lift head (3.1) enter the lift pipe (3.2), thereby reducing the density of the water in the lift pipe (3.2). Under the action of the pressure difference between the water inside and outside the lift pipe (3.2), the water in the lift pipe (3.2) floats up, and at the same time, it carries the bottom sediment to float up and spray it out of the water surface.

3. The pneumatic dredging device with jet and air lift effects according to claim 2, characterized in that: The air lift device (3) has at least one air lift head (3.1) positioned above the top of the pump body (1.1).

4. The pneumatic dredging device with jet and air lift effects according to claim 2, characterized in that: The air lift device (3) has at least one air lift head (3.1) positioned at least 5 meters above the top of the pump body (1.1).

5. A pneumatic dredging device with jet and air lift effects according to claim 2, characterized in that: The air lift inlet (3.1.1) is also equipped with an air lift inlet check valve. 3.1.1.1）。 6. The pneumatic dredging device with jet and air lift effects according to claim 1, characterized in that: The jet generator (4.1) is a pulse jet generator.

7. A pneumatic dredging device with jet and air lift effects according to claim 1, characterized in that: A jet inlet check valve is also provided on the jet inlet pipe (4.3). 4.3.1), when the exhaust pressure of the pneumatic pump (1) is higher than the ambient water pressure at the location of the jet device (4), part of the exhaust from the pneumatic pump (1) passes through the vent ( 1.1.1), exhaust pipe (1.3), jet inlet pipe (4.3) enter jet generator (4.1) to generate jet effect, another part enters through vent ( 1.1.1), exhaust pipe (1.3), air lift inlet pipe (3.3), air lift inlet (3.1.1), and air lift head (3.1) enter the lifting pipe (3.2) to generate air lift effect; when the exhaust pressure of the pneumatic pump (1) is lower than the ambient water pressure at the location of the jet device (4), the jet inlet check valve (4.3.1) closes under the action of ambient water pressure, and all exhaust from the pneumatic pump (1) passes through the vent ( 1.1.1), exhaust pipe (1.3), air lift inlet pipe (3.3), air lift inlet (3.1.1), air lift head (3.1) enter the lift pipe (3.2) to generate air lift effect.

8. A pneumatic dredging device with jet and air-lift functions according to any one of claims 1-7, characterized in that: The device is equipped with a controller (5) and at least two pneumatic pumps (1). Under the command of the controller (5), when the air compressor (2) injects high-pressure gas into one of the pneumatic pumps (1) to discharge mud, the other pneumatic pumps are in the state of exhausting and feeding mud.

9. A pneumatic dredging device with jet and air lift effects according to claim 8, characterized in that: The pneumatic pump (1) is also equipped with a pneumatic reversing valve (6). One end of the pneumatic reversing valve (6) is connected to the air inlet (1.1.1), and the other end is connected to the air inlet pipe (1.2) and the exhaust pipe (1.3) respectively. The pneumatic reversing valve (6) controls the air inlet and exhaust sequence of the pneumatic pump (1) according to the time command of the controller (5).

10. A pneumatic dredging device with jet and air-lift functions according to claim 9, characterized in that: The pump body (1.1) is also equipped with a liquid level sensor (7). The controller (5) sends a command to the pneumatic reversing valve (6) based on the liquid level signal of the liquid level sensor (7) to control the air intake and exhaust sequence of the pneumatic pump (1).

11. A pneumatic dredging device with jet and air lift effects according to claim 8, characterized in that: The pneumatic pump exhaust pipe (1.3) is also equipped with an exhaust reversing valve (8). One end of the exhaust reversing valve (8) is connected to the exhaust pipe (1.3), and the other end is connected to the air lift device (3) and the jet device (4) respectively. The exhaust reversing valve (8) controls the exhaust timing between the air lift device (3) and the jet device (4) according to the time command issued by the controller (5).

12. A pneumatic dredging device with jet and air lift effects according to claim 11, characterized in that: The pneumatic pump exhaust pipe (1.3) is also equipped with a pressure sensor (9). The controller (5) sends a command to the exhaust reversing valve (8) based on the exhaust pressure of the pneumatic pump (1) to control the timing of exhaust discharge between the air lift device (3) and the jet device (4).

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