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液力偶合器(联轴节)是一种动液传动装置。结构简单,使用方便,起动力矩大,能防止电动机闷车、烧坏,能吸收传动系统中的振动,延长传动部件的使用寿命,多电动机传动时能使功率均衡分配,这些优点是机械联轴装置、双速电动机等所难以完全达到的。因此,偶合器在矿山、船舶和起重运输机械等设备中,得到广泛地应用。偶合器的工作介质,在国外和国内部曾使用矿物油。当温度高的矿物油从偶合器喷出时,或当热油喷到热金属表面(例如由于摩擦而发热的金属元件)上时,就有着火的危险。因此,对于工作温度较高(高达120℃或140℃)而又没有冷却装置的液力偶合器,国外早已明令禁止使用矿物油,而改为使用抗燃液了。抗燃液通常分为两大类: (1) 难燃液在较高温度下才会着火
Hydraulic coupling (coupling) is a kind of hydrodynamic drive. The utility model has the advantages of simple structure, convenient use and large starting torque, can prevent the motor from getting bored and burned, can absorb the vibration in the transmission system and prolong the service life of the transmission components, and can evenly distribute the power when the motor is driven. Devices, two-speed motor can hardly be fully achieved. Therefore, the coupling in the mining, shipping and lifting transport machinery and other equipment, has been widely used. Coupling working medium, in foreign and domestic use of mineral oil. There is a danger of fire when hot mineral oil is ejected from the coupling, or when hot oil is sprayed onto a hot metal surface, such as a metal element that generates heat due to friction. Therefore, for the working temperature is high (up to 120 ℃ or 140 ℃) without the cooling device of the hydraulic coupling, the foreign countries have already banned the use of mineral oil, instead of using a fire-resistant liquid. Fire-fighting fluids are usually divided into two categories: (1) The flame-retardant fluid ignites at higher temperatures