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我厂一台XS-ZY-1000注塑机采用榆次液压件厂生产的Y2B-A26C-FF型双级叶片泵作动力元件。今年5月,二级泵被磨坏后,我们换掉了旧零件,装上了包括转子、定子及全部叶片的新二级泵。但使用不到十六个小时,十二块新叶片又均被磨短4～5mm,其中两块脱出叶片槽,卡住转子,剪断了两级泵之间的定位联结销,造成停机事故。这种泵除了两级泵结构相同外,还有一个负载平衡阀。如图所示,阀活塞的大小端面分别承受压力P′
I plant a XS-ZY-1000 injection molding machine used Yuci Hydraulic Factory production Y2B-A26C-FF-type two-stage vane pump for power components. In May of this year, after the secondary pump was worn out, we replaced the old parts and installed a new secondary pump including the rotor, the stator and all the blades. However, less than sixteen hours were used. Twelve new blades were again worn for 4 to 5 mm, two of which were out of the vane slot and stuck the rotor, thus cutting off the positioning coupling pin between the two pumps, resulting in a shutdown accident. This pump in addition to the same two-stage pump structure, there is a load balancing valve. As shown, the size of the valve piston end face respectively to withstand the pressure P ’