产品详情
PVH131R03AF30B2520000010 010001
图4 贵州红林HSV高速开关阀Fig.4 HSV high-speed on/off valve
图5 Caterpillar公司的锥阀式高速开关阀Fig.5 Poppet high-speed on/off valve of Caterpillar
除了采用传统结构的高速开关阀,新型的数字阀结构也是研究的重点。明尼苏达大学(University of Minnesota)设计了一种通过PWM信号控制的高速开关转阀,如图6所示。该阀的阀芯表面呈螺旋形,PWM信号与阀芯的转速成比例。传统直线运动阀芯运动需要克服阀芯惯性而造成的电机械转换器功率较大,而该阀的驱动功率与阀芯行程无关。从实验结果可知,在试验压力小于10 MPa的情况下,该阀流量可以达到40L/min,频响100Hz,驱动功率30 W。
浙江工业大学在2D电液数字换向阀方面展开研究,如图7所示。其利用三位四通2D数字伺服阀,在阀套的内表面对称的开一对螺旋槽。通过低压孔、高压孔与螺旋槽构成的面积,推动阀芯左右移动。步进电机通过传动机构驱动阀芯在一定的角度范围内转动。该阀利用旋转电磁铁和拨杆拨叉机构驱动阀芯作旋转运动;由油液压力差推动阀芯作轴向移动,实现阀口的高速开启与关闭。当用旋转电磁铁驱动时,在28 MPa工作压力下,阀芯轴向行程为0.8mm,开启时间约为18ms,6mm通径阀流量高达60L/min。
图6 高速开关转阀Fig.6 High-speed rotary on/off valve
图7 2D电液数字换向阀原理Fig.7 Schematic diagram of 2Ddigital valve
1.3 高速开关阀并联阀岛研究
上述研究都是针对数字信号控制的高速开关阀。然而,由于阀芯质量、液动力和频响
PVH131R03AF30B2520000010 010001
PRESSURE LIMITER AND LOA D SENS PVH074R13AA10B252000001A F1AB01
PVH074R13AA10E252004001A F1AA01
PVH074R13AA10E252015001A F1AE01
PVH074R13AA10H002000AW1A F1AB01
PVH081R01AA10A1500000020 01AC01
PVH098L01AJ30A2500000010 010001
PVH098L01AJ30A2500000020 010001
PVH098L01AJ30A2500000020 01AB01
PVH098L01AJ30B2520000010 01AB01
PVH098L02AJ30A2500000010 010001
PVH098L02AJ30B172000001A D20001
PVH098L02AJ30B2520000010 010001
PVH098L02AJ30B2520000010 01AP01
PVH098L02AJ30B252000001A D10001
PVH098L02AJ30B2520000020 010001
PVH098L02AJ30B252000AL10 01AP01 PVH098L02AJ30K2500000010 010001
PVH098L03AJ30A250000001A D1AA01
PVH098L03AJ30B252000001A D10001
PVH098L03AJ30B252000001A M10001
PVH098L03AJ30B252000AL1A D2AP01
PVH098L03AJ30B282000001A D10001
PVH098L13AJ30E252004001A D1AA01
PVH098L52AJ30B2420000010 010001
PVH098L52AJ30B252000001A D20001
PVH098R01AD30A2500000010 01AB01
PVH098R01AJ30A0700000020 01AB01
PVH098R01AJ30A1400000020 01AF01
PVH098R01AJ30A2500000010 010001
PVH098R01AJ30A2500000010 01AB01
PVH098R01AJ30A2500000010 01AB01
PVH098R01AJ30A2500000020 010001
PVH098R01AJ30A2500000020 01AB0
PVH131R03AF30B2520000010 010001