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调速回路是液压系统中应用最广的回路之一。当所需要的调速范围大时,液压泵输出的大部分油液不作有效功,而直接流回油箱。能量的利用率很低并使系统油温很快升高。为了使驱动特性与受控对象的负载特性相匹配,以减少能量损失,可采用双联泵分流与合流交替来实现有级速度。例如,大型塑料注射机,采用三联泵驱动回路,比单泵驱动节能50%。多泵回路与变量泵回路相比,既可使液压系统获得较高的效率,且成本低、工作可靠、反应迅速。
Speed loop is one of the most widely used circuits in hydraulic systems. When the required speed range is large, most of the fluid output from the hydraulic pump does not flow efficiently and flows back directly to the tank. The utilization of energy is low and the system oil temperature is rapidly rising. In order to match the driving characteristics with the load characteristics of the controlled object to reduce the energy loss, the cascade speed can be realized by the alternate pump shunting and merging alternation. For example, a large plastic injection machine that uses a triple pump drive circuit saves 50% more energy than a single pump drive. Compared with the variable pump circuit, the multi-pump circuit can not only achieve high efficiency of the hydraulic system, but also have low cost, reliable operation and rapid response.