高压叶片泵的特点:对油液的要求居中,早期的叶片泵受定子曲线和材料的影响,压力不能达到太高,现在高压叶片泵可以做到21M Pa,因为其启动力矩小,常用在汽车助力泵上,和齿轮泵及柱塞泵相比,脉动居中,自吸性能居中。
2.1拆开叶片泵后,应检查叶片泵的以下几方面:
定子内曲线的磨损情况,配流盘的磨损情况。这些磨损与输出流量、压力下降,内泄漏增大,元件发热等有关,也与压力波动增大有关。定子内曲线的磨损主要发生在吸油过渡区。为避免泵抽空,严禁使用精密过滤器。对于叶片泵,油液的清洁度应达到国家标准等级16 / 19级,使用的过滤器精度大多为25~30un。
2.2测量方法:
叶片在转子槽内,能自由灵活移动,保证其间隙为0.015~0.025mm;
叶片高度略低于转子的高度,其值为0.005mm;
轴向问隙控制在0.04-0. 07mm;用手旋转主动轴,应保证平稳,无阻滞现象.
2.3修复方法:
2.3.l定子的修复
叶片油泵工作时,叶片在高压油及离心力的作用下,紧靠住定子曲线面,叶片与定子曲线表而接触压力大而磨损快,特别在吸油腔部分,叶片根部由较高的载荷压力顶住。因此,吸油腔部分最容易磨损。当曲线表而轻微磨损时,可以用油石抛光即可。既经济又方便的修复方法是将定子翻转180安装,并在对称位置重新加工定位孔,使原吸油腔变为压油腔。
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20V4A
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20V5A
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20V6A
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20V7A
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20V8A
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20V9A
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20V10A
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25V17A
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叶片的修复
叶片一般与定子内环表面接触,叶片顶端和配流盘相对运动的两侧易磨损,磨损后可利用专用工具装夹修磨,恢复其叶片精度