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一、前 言 本文讨论了一种用于往复压缩机排气量无级调节系统的设计与改进问题。与一般按恒定差值改变排气量的分级调节系统不同,这个系统的调节量是不受限定的,因此是无级的,排气量能控制在恰与所需的气体量相适应。此无级系统是在部分压缩行程中用液压使吸气阀保持开启,使得一些已经吸入到气缸里的气体又被排回吸入管。当解除液压开始进行压缩时,排气量可以从0到 10O％任意调节。液压分配器受曲轴控制,在吸气阀正常打开以后,它加压于吸气阀卸荷器。另一套装置检查和指示排气压力或排气量,并通过一个定位器推迟或提前解除作用在吸气阀卸荷器上的液压,从而将压缩机排气量调整到完全合乎需要。
I. Introduction This paper discusses the design and improvement of a stepless regulation system for reciprocating compressor displacement. Unlike a staged regulation system that varies the amount of exhaust by a constant difference, the amount of regulation in this system is unrestricted and therefore infinitely variable, and the amount of exhaust can be controlled to exactly match the amount of gas required. This stepless system hydraulically keeps the suction valve open during a partial compression stroke so that some of the gas that has been drawn into the cylinder is drained back into the suction tube. When relieving the hydraulic pressure starts to be compressed, the displacement can be arbitrarily adjusted from 0 to 10%. The hydraulic distributor is controlled by the crankshaft. After the suction valve opens normally, it pressurizes the suction valve unloader. Another set of devices checks and indicates exhaust pressure or displacement and deactivates or prematurely relieves the hydraulic pressure acting on the suction valve unloader by a positioner to fully adjust the displacement of the compressor.