Jet type sand dredger

Abstract

The invention belongs to the technical field of ships, and relates to a jet type sand dredger, which comprises pumping equipment. The pumping equipment comprises a jet type dredging device and a water pump device. The jet type dredging device comprises a fresh water pipe, a vacuum chamber, a sand feeding nozzle and a sand feeding pipe. The vacuum chamber is provided with a nozzle, a water outlet end of the fresh water pipe is connected with the nozzle, and an outlet end of the sand feeding nozzle is communicated with the vacuum chamber. The water pump device comprises at least two water pumps and starting equipment, wherein each water pump is provided with a water inlet and a water outlet, the water outlet of each water pump is connected with the water inlet end of the fresh water pipe, the water pumps are connected with the starting equipment, and the water pumps are connected in series. The jet type sand dredger is high in sand dredging quantity and has the advantages of energy conservation, environmental friendliness, high operability, reduced investment cost and reduced operational cost, and the size and the displacement tonnage of a boat of the jet type dredger can be reduced.

Description

technical field [0001] The invention belongs to the technical field of ships, in particular to a jet-type dredging ship. Background technique [0002] Sand dredging boats, also known as dredging boats, are used for dredging sand in rivers and sea areas. The daily sand dredging capacity of sand dredging boats ranges from several thousand tons to tens of thousands of tons. The sand dredging ship is mainly carried out by sand pumping equipment. The sand dredging equipment includes a jet dredging device and a water pump device. The water pump device includes a starting device and a water pump. 1. The upper sand nozzle and upper sand pipe, the clear water pipe is connected with the water pump device, and the upper sand pipe is connected with the sand washing tank of the jet-type sand dredger. [0003] The working principle of the sand pumping equipment is to continuously pump high-speed water into the clear water pipe through the water pump. When the high-speed water is sprayed...

AI Technical Summary

Problems solved by technology

The second-generation jet sand dredger increases the sand mining output by increasing the flow rate of the nozzle. When the flow rate of the nozzle is too large, the water flow rate is large, and the water flow rolls in the sand washing tank. The sand is not easy to settle, and the excessive water flow rate is easy. The sand mixture sucked up by the upper sand nozzle is flushed out of the jet-type sand dredger and returned to the river. The loss rate of sand is high, which affects the production of quicksand

The third-generation jet dredger has a large horsepower, and the LB8250 diesel engine burns 180# heavy oil, which is more economical than the first-generation and second-generation jet dredgers, but it also has the disadvantages of the second-generation jet dredger. In the case of constant diameter, when 3 to 7 pumps are connected in parallel, the total flow of the pumps will increase, and the flow of the nozzles will increase. By increasing the flow of the nozzles, the sand mining output will be increased.

When the flow rate of the nozzle is too large, the water flow is large, and the water flow rolls in the sand washing tank, and the sand is not easy to settle. The excessive water flow rate will easily flush the sand mixture sucked by the upper sand nozzle out of the jet-type sand dredger and return to The river surges, and the loss rate of sand is high, which affects the production of quicksand

Moreover, increasing the flow rate by connecting water pumps in parallel requires the selection of high-power starting equipment and water pumps, which consumes a lot of energy and consumes a lot of power

[0011] In addition, the disadvantages of the third-generation jet-type sand dredger are: the cost is high, and the cost of the third-generation jet-type dredger is 30 million to 70 million yuan; because the LB8250 diesel engine has a large volume and burns 180# Heavy oil requires a lot of auxiliary equipment, such as boilers, oil supply units, oil purifiers, heating devices and various pipelines, etc., so install 3~7 LB8250 diesel engines and 3~7 water pumps of the third-generation jet Type sand dredgers are bulky, and it is not conducive to accurately find the location of the sand source when dredging sand; the displacement tonnage is large, and the displacement tonnage is 3000 tons to 4000 tons

Due to the high cost and high power loss of the third-generation jet sand dredger, when sand dredging is carried out in sea areas with thin sand layers, the profit is meager due to the large expenses of fuel, labor, maintenance, etc., so how to reduce the cost of manufacturing and using , maintenance cost, has become an urgent technical problem to be solved in the sand fishing industry

Images