Large-power-span diesel engine cooling system of amphibious vehicle

Abstract

The invention provides a large-power-span diesel engine cooling system of an amphibious vehicle. The cooling system comprises a fresh water pump, the water inlet end of the fresh water pump fixedly communicates with an expansion water tank, the water outlet end of the fresh water pump fixedly communicates with an engine oil heat exchanger, the other end of the engine oil heat exchanger sequentially communicates with an engine, a high-pressure-stage fresh water intercooler, a three-way valve, a water radiator, a sea fresh water heat exchanger, a sea water pump, an interstage intercooler and a high-pressure-stage sea water intercooler. According to the large-power-span diesel engine cooling system of the amphibious vehicle, the interstage intercooler and the high-pressure-stage intercooler are arranged in a sea water circulation system, most of intercooling heat dissipating capacity is cooled through sea water, compared with a cooling system with all intercoolers arranged in fresh water circulation, the cooling system has the advantages that the heat exchange link is reduced, the heat exchange efficiency is improved, the compactness of the system is improved, the knock ablation problem caused by no intercooling when the inlet air temperature of the engine is low is avoided, inlet air of the engine is cooled in the land high-temperature environment, the inlet air temperature and the oil consumption are reduced, and the economical efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of power cooling for amphibious vehicles, and in particular relates to a cooling system for large-power-span diesel engines of amphibious vehicles. Background technique [0002] The engine of amphibious vehicles has the characteristics of large power span. In the water working condition, the vehicle resistance is relatively large, and the water working condition requires a high speed, so the engine power is relatively large; in the land working condition, the vehicle resistance and engine power are greatly reduced, while The calibrated speed of the engine in the water and land conditions is basically the same. The cooling water pump of the engine is generally a centrifugal water pump, relying on mechanical transmission, the transmission ratio remains unchanged, and the cooling system meets the matching requirements of the working conditions on the water. In the working conditions on land, there will be probl...

AI Technical Summary

Problems solved by technology

The cooling water pump of the engine is generally a centrifugal water pump, relying on mechanical transmission, the transmission ratio remains unchanged, and the cooling system meets the matching requirements of the working conditions on the water. In the working conditions on land, there will be problems such as high power consumption of the cooling system and easy overcooling of the system. Therefore, A large power span engine cooling system for amphibious vehicles is required

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