目录
冷却系统|类型,优点和缺点
A vehicle’s engine-cooling system serves not just to keep the engine cool, but to also keep its temperature warm enough to ensure efficient, clean operation. System components include a radiator to dissipate heat, a fan or fans to ensure adequate airflow for radiator cooling, a thermostat valve that opens when the desired operating temperature is reached and a water pump (or coolant pump) to circulate coolant through the engine, hoses and other components. Most vehicles now employ an expansion tank that allows the coolant to expand, and exit, the cooling circuit when hot, and to return when the car is turned off and the engine cools. The cooling system also incorporates elements of the cabin’s ventilation system, because engine heat is used to warm the car’s interior.
阅读更多 :
水冷系统零件|优点和缺点
Water Cooling System in Engine | types of water cooling system
Engine Cooling | Air Cooling System – Advantages and Disadvantages
润滑和冷却系统在发动机中的重要性
While running, an engine continuously produces heat and converts it into power.This heat is derived by burning fuel in the engine.但随着我们都知道,世界上没有引擎100%效率。There is always some amount of heat energy which gets wasted. If we do not transmit this heat energy into the atmosphere, this heat will overheat the engine.这种过热将导致发动机抓住。在发动机抓住时,由于过量的热活塞在气缸内熔化。它避免了过热汽车的麻烦提供发动机冷却系统。
发动机冷却系统是与发动机一体的系统。它在流动的流体的帮助下,它通过发动机带走过量的热量。这种流体可以是空气或水。
冷却系统的类型:
或者我们可以说有两种类型的冷却系统
1. Liquid or indirect cooling system
2.空气或直接冷却系统
液体或间接冷却系统
在液体冷却系统中,发动机包围着水夹克。借助泵的帮助,这种水在这个水夹克中循环。
在这些夹克中流动的水从发动机取出热量。这种热水比流过散热器,在那里它从吹过风扇吹的冷热冷却。
在该系统中,水从发动机中加热,并且水通过空气冷却,并且再次被循环到发动机。
这是一个间接冷却过程,其中空气的实际冷却物不是直接冷却系统。空气冷却水和水冷却发动机。
液体或间接冷却系统主要用于大发动机,如汽车和卡车。
好处
1. Compact design of engines
2. It provides even cooling to the engine
3. Engine can be installed at any location of the vehicle. It is not necessary to install engine at the front.
4. It can be used in both small and big engines
限制
这里的水夹克成为发动机的额外部分。
2. Water circulation consumes power, thus reduces engine efficiency.
3.在冷却系统失败的情况下,发动机可能发生严重的损坏。
4.系统的成本相当高。
5.它需要常规维护,从而提高额外的维护费用负担。
空气或直接冷却系统
在直接冷却系统中,发动机通过流过空气直接冷却。它是相同的冷却系统,用于冷却我们的自行车发动机。
当we can see here, air is in direct contact with the engine hence it is also known as direct cooling system.
空气冷却系统用于小型发动机,如自行车和草切割机等。
好处
1.发动机的设计变得更简单。
2. Repair is easy in case of damages.
3.缺乏庞大的冷却系统可以轻松使系统维护。
4. No danger of coolant leakage.
5.发动机不受冻结的麻烦。
6.系统的重量较少。
7.它是一个自包含的单位,因为它不需要散热器,标题,坦克等。
8.安装空气冷却系统很容易。
限制
1. It is applicable to only small and medium sized engines.
2. It can only be used at the places where ambient temperatures is lower.
3. Cooling is not uniform.
4.与水冷发动机相比,工作温度较高。
它产生更多的空气动力学噪音。
6. Specific fuel consumption is slightly higher.
7.降低最大允许压缩比率。
8.如果使用的话,风扇消耗了发动机产生的近5%的功率。
高效发动机冷却系统的特点
以下是高效发动机冷却系统的两个主要特征。
它应该能够去除发动机中产生的约30%的热量,同时保持发动机中的最佳工作温度。
它应该以更快的r去除热量ate when engine is hot and remove engine at slow rate when engine is cold.







