Dredging system

Abstract

A dredging system primarily utilizes an ejector to generate a high-pressure jet. A negative pressure suction pipeline connects to a submerged shell, drawing in the dredged mud-water mixture and pumping it to the treatment end. The shell forms a sealed working space, housing a mechanical excavator or high-pressure water jet for mud removal. A water supply pipeline maintains stable negative pressure and mixing efficiency, and a check valve at the water inlet prevents backflow. This system can pump out high concentrations of mud, sand, and debris, preventing pump damage and mud-water leakage. It also features a buoyancy control function; when the shell becomes stuck in the mud, high-pressure water can be injected in reverse to increase pressure and assist in buoyancy. It offers advantages such as low pollution, high stability, and high-concentration transport, making it suitable for efficient dredging operations in reservoirs, ports, and other water areas.

Claims

1. A dredging system, mainly comprising: A shell, submerged in the bottom of the water, covers the mud layer of the work area, forming a closed space and maintaining a negative pressure state inside the shell to prevent mud and water leakage. The shell has at least one water inlet and one mud and water outlet. An ejector includes a main body positioned on the water surface, having a high-pressure water inlet, a suction inlet, a water outlet, and an inner tube. The high-pressure water inlet is connected to a high-pressure water source to inject water flow and generate a Venturi effect, creating negative pressure. A negative pressure suction pipe connects the suction inlet to the mud and water outlet of the shell. The water outlet is above the water surface and is used to discharge the sucked-in high-concentration mud and water mixture to the treatment area. The inner tube is fitted inside the water outlet to enhance the rapid flow of the internal high-pressure water column, increasing the negative pressure suction force between the main body and the negative pressure suction pipe. A shoveling system, located inside the outer shell, is used to shovel the bottom soil of the shell to form a pumpable mud-water mixture. The shoveling system includes a mechanical shovel or an ultra-high pressure water jet nozzle. A water supply pipe, connected to the water inlet of the outer shell, is used to replenish water under negative pressure. A check valve is provided on the water supply pipe to prevent backflow of the mud-water mixture. The ejector outlet is above the water surface and connected to an onshore treatment device or sedimentation tank to transport the pumped high-concentration mud-water mixture to the downstream treatment area. The ejector outlet is further connected to a valve that can be closed to cause high-pressure water to be injected back into the outer shell, increasing the internal pressure of the shell and assisting in the shell structure to float and detach from the mud layer, facilitating external lifting equipment for detachment.

2. The dredging system as described in claim 1, wherein the body of the ejector is provided with a vacuum gauge for detecting the vacuum level maintained between the housing and the ejector.

3. The dredging system as described in claim 1, wherein the excavation system comprises: an ultra-high pressure water jet nozzle configured at a fixed angle, or an excavation power motor connected above a mechanical rotary excavator.

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