A pneumatic dredging device combining the effects of pressure and gas lift

Abstract

The invention relates to a kind of pneumatic dredging device combining pressure sending and gas lift, mainly provided with pneumatic pump, air compressor, gas lift device;Its characterized in that: gas lift device is connected with pneumatic pump exhaust pipe by pipeline;When pneumatic pump exhausts, exhaust enters gas lift device, part of silt under water is discharged from water body under the gas lift of gas lift device, another part of silt enters pneumatic pump under the action of ambient water pressure along with the discharge of high-pressure gas in pneumatic pump;After silt fills pneumatic pump, air compressor injects high-pressure gas into pneumatic pump, and high-pressure gas pushes silt in pneumatic pump to be discharged from pneumatic pump discharge pipe.The pneumatic dredging device combining pressure sending and gas lift of the invention fully utilizes the exhaust energy of pneumatic pump, and has 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 to a pneumatic desilting device that combines pressure delivery and air lift. 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 have the advantages of simple structure and no water pollution during dredging, the high-pressure air inside the pump is directly discharged into the atmosphere without generating effective work, resulting in energy waste, low energy utilization rate, and high energy consumption costs. Especially in the case of using pneumatic pumps to transport slurry over long distances through pipelines, the pressure of the high-pressure air inside the pump is much greater than the ambient water pressure. Directly discharging this high-pressure air into the atmosphere will cause a huge waste of energy and greatly increase the operating cost of pneumatic pumps.

[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 device for dredging and cleaning that can reduce energy consumption and improve energy utilization efficiency is needed. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems by providing a pneumatic dredging device that combines pressure delivery and air lift. 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 delivery and air lift, utilizing the high-pressure exhaust of existing pneumatic pumps to generate the air lift effect, 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 combining pressure conveying and air lift, mainly comprising a pneumatic pump, an air compressor, and an air lift 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, having 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 characteristic feature is that: the air lift device is connected to the pneumatic pump's exhaust pipe; when the pneumatic pump exhausts air, the exhaust air enters the air lift device through the air vent and the exhaust pipe, and part of the sediment at the bottom of the water is discharged from the water body under the air lift action of the air lift device, while another part of the sediment, along with the high-pressure gas discharged from the pump body, enters the pump body through the sludge inlet under the action of ambient water pressure; after the sediment fills the pump body, the air compressor injects high-pressure gas into the pump body through the air inlet and the air vent, the sludge inlet check valve closes under the push of gas pressure, and the high-pressure gas pushes the sediment in the pump body to be discharged through the sludge discharge pipe.

[0007] Furthermore, a pneumatic dredging device combining pressure conveying and air lift is characterized by: having at least one air lift device, each air lift device having a lifting pipe, an air lift inlet pipe and at least one air lift head, the air lift head also having an air lift inlet, the air lift inlet being 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 bottom sediment to float up and spray it to the water surface.

[0008] Furthermore, a pneumatic dredging device that combines pressure conveying and air lift 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 that combines pressure conveying and air lift 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 that combines pressure delivery and air lift 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 that combines pressure conveying and air lift is characterized in that: it is equipped with a controller and at least two pneumatic pumps, and 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 the state of exhausting sludge and feeding sludge.

[0012] Furthermore, a pneumatic sludge removal device that combines pressure delivery and air lift 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.

[0013] Furthermore, a pneumatic sludge removal device that combines pressure delivery and air lift 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.

[0014] This invention provides a pneumatic dredging device that combines pressure conveying and air lift. It utilizes the exhaust of a pneumatic pump to generate an air lift effect, thereby improving the energy utilization efficiency and working efficiency of the pneumatic pump. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural view of Embodiment 1 of the present invention.

[0016] Figure 2 This is a front view of Embodiment 1 of the present invention.

[0017] Figure 3 This is a top view of Embodiment 1 of the present invention.

[0018] Figure 4 This is a right view of Embodiment 1 of the present invention.

[0019] Figure 5 This is a three-dimensional structural view of the pneumatic pump according to Embodiment 1 of the present invention.

[0020] Figure 6 This is a schematic diagram of the pneumatic pump according to Embodiment 1 of the present invention.

[0021] Figure 7 This is a three-dimensional structural view of Embodiment 2 of the present invention.

[0022] Figure 8 This is a front view of Embodiment 2 of the present invention.

[0023] Figure 9 This is a top view of Embodiment 2 of the present invention.

[0024] Figure 10 This is a right view of Embodiment 2 of the present invention.

[0025] Figure 11 This is a three-dimensional structural view of Embodiment 3 of the present invention.

[0026] Figure 12 This is a right view of Embodiment 3 of the present invention.

[0027] Figure 13 This is a front view of Embodiment 3 of the present invention.

[0028] Figure 14 This is a top view of Embodiment 3 of the present invention. Detailed Implementation

[0029] The invention will now be further described with reference to the accompanying drawings.

[0030] Example 1, see appendix Figure 1-6 A pneumatic dredging device combining pressure conveying and air lift is mainly composed of three pneumatic pumps 1, an air compressor 2, two air lift devices 3, a controller 4, and a pneumatic reversing valve 5. 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. Each air lift device 3 is equipped with a lifting pipe 3.2 and an air lift air inlet. Pipe 3.3 and two air lift heads 3.1, each air lift head 3.1 is equipped with an air lift inlet 3.1.1 connected to the air lift inlet pipe 3.3; 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 air pump inlet pipe 1.2 connects the air compressor 2 to the air reversing valve 5; one end of the air reversing valve 5 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.

[0031] 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 to allow mud to enter, the controller 4 controls the pneumatic reversing valve 5 to disconnect the air inlet pipe 1.2 from the vent 1.1.1, and at the same time connects the exhaust pipe 1.3 to the vent 1.1.1. The water pressure pushes open the mud entry check valve 1.1.3, and the mud at the bottom of the water enters the pump body 1.1 through the mud entry port 1.1.2 under the action of the ambient water pressure. After the controller 4 determines that the mud has filled the pump body 1.1 according to the clock information, it controls the pneumatic reversing valve 5 to disconnect the exhaust pipe 1.3 from the vent 1.1.1 and connect the air inlet pipe 1.2 to the vent 1.1.1. The air compressor 2 injects high-pressure gas into the pump body 1.1 through the air inlet pipe 1.2, the pneumatic reversing valve 5 and the vent 1.1.1. The mud entry check valve 1.1.3 closes under the push of the gas pressure, and the high-pressure gas pushes the pump body 1. The silt in pump body 1.1 is discharged through sludge discharge pipe 1.4. Controller 4, based on clock information, determines that the silt in pump body 1.1 has been emptied, and controls pneumatic reversing valve 5 to disconnect air inlet pipe 1.2 from vent 1.1.1, while simultaneously connecting exhaust pipe 1.3 to vent 1.1.1. High-pressure gas in pump body 1.1 enters lift pipe 3.2 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, thereby reducing the density of the water in lift pipe 3.2. Under the pressure difference between the inside and outside of lift pipe 3.2, the water in lift pipe 3.2 rises, simultaneously carrying some bottom silt to the surface. At the same time, some bottom silt will also enter pump body 1.1 through sludge inlet 1.1.2 under the influence of ambient water pressure as high-pressure gas is discharged from pump body 1.1. By controlling the pneumatic reversing valve 5 through the controller 4, when the air compressor 2 injects high-pressure gas into one of the pneumatic pumps 1 to discharge sludge, the other two pneumatic pumps 1 are in the state of exhausting sludge and feeding sludge.

[0032] Example 2, see appendix Figure 7-10 A pneumatic dredging device combining pressure conveying and air lift is described, mainly comprising a pneumatic pump 1, an air compressor 2, an air lift device 3, a controller 4, a pneumatic reversing valve 5, and a liquid level sensor 6. Unlike Embodiment 1, this device includes four pneumatic pumps 1 and three air lift devices 3. Each pneumatic pump body (1.1) is equipped with a liquid level sensor 6. Each air lift device 3 has three air lift heads 3.1. The first air lift head is level with the top of the pump body 1.1, the second air lift head is 5m higher than the first, and the third air lift head is 10m higher than the first. The remaining structure is the same as in Embodiment 1. The working process differs from Embodiment 1 in that the controller 4 determines whether the sludge in the pump body 1.1 is full or empty based on the liquid level signal from the liquid level sensor 6. The remaining working process is the same as in Embodiment 1.

[0033] Example 3, see appendix Figure 11-14A pneumatic dredging device combining pressure conveying and air lift is mainly composed of a pneumatic pump 1, an air compressor 2, and an air lift device 3. The pneumatic pump 1 has 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 inlet 1.1.1, a sludge inlet 1.1.2, and a sludge inlet check valve 1.1.3. The air lift device 3 has a lifting pipe 3.2, an air lift inlet pipe 3.3, and two air lift heads 3.1, each of which has an air lift inlet. The air inlet 3.1.1 is connected to the air lift inlet pipe 3.3; each air lift inlet 3.1.1 is also equipped with an air lift inlet check valve 3.1.1.1 to prevent water in the lift pipe 3.2 from flowing back into the exhaust pipe 1.3 when the air 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 air inlet pipe 1.2 connects the air compressor 2 to the air vent 1.1.1, and the exhaust pipe 1.3 connects the air vent 1.1.1 to the air lift inlet pipe 3.3.

[0034] 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 vent 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; the other part of the high-pressure air enters the air lift device 3 through the air inlet pipe 1.2 and the exhaust pipe 1.3, and the sludge at the bottom of the water is discharged from the water body 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 air lift device 3 through the vent 1.1.1 and the exhaust pipe 1.3. Under the air lift action of the air lift device 3, part of the sediment at the bottom of the water is discharged from the water body through the lift pipe 3.2. Another part of the sediment, along with the discharge of the high-pressure gas in the pump body 1.1, enters the pump body 1.1 through the mud inlet 1.1.2 under the action of the ambient water pressure.

[0035] 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 dredging device combining pressure conveying and air lift, mainly comprising a pneumatic pump (1), an air compressor (2), and at least one air lift device (3); 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) are respectively connected to air inlet pipe (1.2) and exhaust pipe (1.3); characterized in that: The air lift device (3) is connected to the exhaust pipe (1.3) of the air pump; when the air pump (1) exhausts, the exhaust passes through the vent ( 1.1.1) The exhaust pipe (1.3) enters the air lift device (3). The bottom part of the mud and sand is discharged from the water body under the air lift action of the air lift device (3). The other part of the mud and sand 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 mud and sand fill the pump body (1.1), the air compressor (2) injects high pressure gas into the pump body (1.1) through the air inlet pipe (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 mud and sand in the pump body (1.1) to be discharged through the mud discharge pipe (1.4). Each air lift device (3) is equipped 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 equipped 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. The air lift device (3) has at least one air lift head (3.1) positioned above the top of the pump body (1.1); The air lift inlet (3.1.1) is also equipped with an air lift inlet check valve. 3.1.1.1）。 2. The pneumatic dredging device combining pressure conveying and air lift as described in claim 1, 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).

3. The pneumatic dredging device combining pressure delivery and air lift as described in claim 1 or 2, characterized in that: The device is equipped with a controller (4) and at least two pneumatic pumps (1). Under the command of the controller (4), when the air compressor (2) injects high-pressure gas into one of the pneumatic pumps (1) to discharge mud, the other pneumatic pumps (1) are in the state of exhausting and feeding mud.

4. The pneumatic dredging device combining pressure conveying and air lift as described in claim 3, characterized in that: The pneumatic pump (1) is also equipped with a pneumatic reversing valve (5). One end of the pneumatic reversing valve (5) 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 (5) controls the air inlet and exhaust sequence of the pneumatic pump (1) according to the time command of the controller (4).

5. The pneumatic dredging device combining pressure conveying and air lift as described in claim 4, characterized in that: The pump body (1.1) is also equipped with a liquid level sensor (6). The controller (4) sends a command to the pneumatic reversing valve (5) based on the liquid level signal of the liquid level sensor (6) to control the air intake and exhaust sequence of the pneumatic pump (1).

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