论文部分内容阅读
恒压式变量叶片泵能保证输出油压基本恒定,而其输出流量可按液压系统的要求进行自动调整。例如在一般的节流调速系统中使用恒压泵,可使泵的输出压力保持基本不变,其输出流量可按所调节的节流阀开口大小,自动调整到系统要求的流量,如果把节流阀开口关小了,泵的输出流量就自动减小,这样就避免了在定量泵节流调速系统中大量的压力油从溢流阀中自自流掉的浪费现象。因此,这种恒压泵的突出优点是:在保证液压系统压力基本恒定的前提下,减少功率损耗,可使液压系统的发热大大降低。这种恒压泵可使用在一般节流调速系统中,也可使用在液压仿形系统和数控机床的液压系统中。一般的节流调速系统中使用限压式变量叶片泵也可降低系统的发热,但是限压式变量泵的输出压力随着输出流量的减小而增加,不能保证恒压,而液压仿形系统和数控机床的
Constant pressure variable vane pump to ensure that the output oil pressure is basically constant, and its output flow can be automatically adjusted according to the requirements of the hydraulic system. For example, the use of a constant pressure pump in a general throttling system can keep the output pressure of the pump basically unchanged, and the output flow rate can be automatically adjusted to the required flow rate of the system according to the adjusted opening size of the throttle valve. Throttle valve opening is closed, the pump output flow is automatically reduced, thus avoiding the quantitative metering pump speed control system, a large number of pressure oil from the overflow valve self-flow out of the waste phenomenon. Therefore, the outstanding advantage of this constant pressure pump is: under the premise of ensuring the pressure of the hydraulic system is basically constant, reduce the power loss, can greatly reduce the heat of the hydraulic system. This constant pressure pump can be used in the general throttling speed control system can also be used in hydraulic profiling system and CNC machine tool hydraulic system. The use of pressure-limiting variable-displacement vane pumps in general throttling and speed-regulating systems can also reduce the heating of the system, but the output pressure of the pressure-limiting variable-displacement pump increases as the output flow rate decreases, and the constant pressure can not be guaranteed. System and CNC machine tools