A circulating water cooling system for a diesel hammer

Abstract

A circulating water cooling system for a diesel hammer, including a water pump, a one-way throttle valve, a pressure gauge, an inlet water temperature sensor and a water inlet pipe, a cylinder, an upper piston, a combustion chamber, and a diesel hammer with suction and exhaust holes, and an outlet Water pipes, the first temperature sensor, heat exchanger, the water outlet pipeline of the second temperature sensor, the water storage tank and the display, the outer wall of the cylinder is provided with an annular water cavity, and its lower and upper parts are respectively provided with a water inlet and a water outlet; The interior of the annular water chamber is provided with a plurality of guide vanes, which are radially arranged on the circumferential surface of the inner wall of the annular water chamber; the heat exchanger is formed by connecting multiple sets of heat exchangers in series, and the The high-temperature hot water inside is cooled in multiple stages to reach the set circulating water temperature. The invention can effectively improve the heat dissipation and cooling conditions of the combustion chamber of the diesel hammer, further improve the working reliability and prolong the service life.

Description

technical field [0001] The invention relates to a diesel hammer, in particular to a circulating water cooling system of a diesel hammer used in pile foundation construction. Background technique [0002] In recent years, with the needs of modern marine engineering foundation construction such as open sea port construction, artificial island construction, cross-sea bridges, oil drilling platforms and offshore wind farms, diesel hammer based on large tonnage has the advantages of large striking energy, simple operation, convenient maintenance and high operating efficiency. High performance and high cost performance are still widely used. However, with the continuous advancement of marine engineering projects, higher load-bearing capacity requirements are put forward for the pile foundation construction of large-scale offshore engineering construction projects. Steel pipe piles with larger pile diameters are used for pile foundation construction, and the pile sinking depth tend...

AI Technical Summary

Problems solved by technology

At present, most of the cooling and heat dissipation structures of diesel hammers are equipped with multiple cooling fins at the lower part of the lower cylinder, and the lower cylinder conducts convective heat exchange with the air through these cooling fins. Thick wall thickness, especially for the thicker cylinder body of a large diesel hammer, it is difficult to dissipate heat. The heat transfer and heat dissipation effect of the current heat sink air-cooled structure is not ideal, and it is easily affected by external conditions, such as the air around the cylinder Due to factors such as high temperature and low wind speed, the heat of the lower cylinder cannot be dissipated in time, which will inevitably cause the temperature of the hammer body to rise sharply and cause many hazards.

First of all, if the temperature of the lower cylinder is too high, it will cause the piling hammer to ignite in advance, and the energy of the fuel explosion cannot be effectively converted into the hammering action on the pile, which will greatly reduce the efficiency of the piling hammer, and even cause it to fail to work normally. We have to stop piling and wait The diesel hammer body is cooled before it can be shipped

Secondly, if the temperature of the lower cylinder is too high, not only will the friction state between the inner wall of the cylinder and the piston deteriorate, but also the strength of the cylinder material will decrease, the plasticity will increase, and the wear will increase. The high temperature and high pressure gas generated by the explosion will act on the cylinder, piston and piston. On the ring, it will cause cavitation of the cylinder, piston and piston ring, and aggravate its corrosive damage. In severe cases, it will cause local melting and straining of the cylinder, piston and piston ring, and even form a cylinder bite, which seriously affects the service life of the diesel hammer. Affecting the construction progress and operation efficiency of pile foundation engineering

Especially with the increase of the tonnage of the pile hammer and the continuous increase of pile diameter and length, the number of continuous hammering of each pile increases, the temperature in the cylinder rises faster, and the damage probability of the cylinder, piston and piston ring is aggravated

In this way, the air-cooled diesel hammer has been difficult to meet the requirements of modern marine engineering foundation construction.

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