Cooling and circulating system for engine

Abstract

The invention discloses a cooling and circulating system for an engine. The cooling and circulating system comprises a cylinder body, a cylinder cover and a water outlet chamber arranged at the cooling water outlet end of the cylinder cover. A cylinder body cooling water channel is formed inside the cylinder body. The cooling and circulating system further comprises a cylinder body temperature regulator and a cylinder cover temperature regulator. The cylinder body temperature regulator is arranged in the position of a water inlet of the cylinder body cooling water channel. The cylinder cover temperature regulator is arranged in the water outlet chamber and used for controlling the cooling water outlet end of the cylinder cover to be communicated or not communicated with a radiator of the engine. The initial starting temperature of the cylinder cover temperature regulator is higher than that of the cylinder body temperature regulator. The cooling and circulating system for the engine has different cooling capacities for the cylinder body and the cylinder cover of the engine according to different working states, and differential cooling is formed, so that the cylinder body and the cylinder cover of the engine work at the most proper set temperature points respectively; in addition, when the engine just starts or operates at the idle speed, the water temperature and the temperature of the cylinder body are made to increase rapidly, and accordingly oil consumption is reduced; meanwhile, when the temperature of the cylinder cover or the temperature of the cylinder body is excessively high, a good cooling effect is achieved.

Description

technical field [0001] The invention relates to the field of engine component cooling, in particular to an engine cooling circulation system. Background technique [0002] The engine block and the cylinder head together form the power transmission components—the casing of the piston and the crankshaft. When the engine does work, it will generate a lot of heat. In order to discharge the heat from the engine casing (that is, the cylinder block and the cylinder head), it is necessary Cooling water passages are arranged in the cylinder block and the cylinder head so that the cooling water flows through the cylinder block and the cylinder head to take away the heat. [0003] During the working process of the engine, in order to improve work efficiency and fuel economy, the temperature of the cylinder head needs to be low, while the temperature of the cylinder body needs to be relatively high, because the low temperature of the cylinder head can improve the charging efficiency, in...

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Problems solved by technology

[0003] During the working process of the engine, in order to improve work efficiency and fuel economy, the temperature of the cylinder head needs to be low, while the temperature of the cylinder body needs to be relatively high, because the low temperature of the cylinder head can improve the charging efficiency, increase the intake air volume, and the temperature is low and A large intake air volume can promote complete combustion, reduce the formation of NOx, and increase output power. Higher cylinder temperature will reduce friction loss, directly improve fuel efficiency and output power, and indirectly reduce the peak pressure and temperature in the cylinder; In the existing cooling system of the engine, the cooling water is pumped into the cylinder block through the water pump and then enters the cylinder head, or enters the cylinder block and the cylinder head separately, so that the cooling water circulates continuously with the operation of the engine. Differentiated cooling of the body and cylinder head often results in a large cooling capacity of the car, which cannot achieve the ideal state of engine thermal work of "lower cylinder head temperature and relatively higher cylinder body temperature", especially when the engine is just started , fuel consumption is large; moreover, when the engine is just started, the lubricating oil in each part of the engine is not in place, and the engine cylinder temperature is too low, which will cause dry grinding of parts, resulting in early wear of cylinder liners, journals, gears and other parts

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