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Alt 07-17-2008, 02:21 PM   #1
ArabaYla
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Standart Common-Rail (Direkt Enjeksiyon)

Motor bloğu boyunca monte edilen ve hat/yol (rail) olarak adlandırılan ortak bir basınç destekleyici kullanan dizel yakıt enjeksiyon sistemi dir. Hat, yüksek basınçlı yakıt pompası tarafından beslenir. ortak hattan beslenen enjektör ler selenoid valfler vasıtasıyla harekete geçirilir. Selenoid valf ler ve yakıt pompası elektronik olarak kontrol edilir. Müşterek hatlı enjeksiyon sisteminde; en jeksiyon basıncı motor devri ve yükünden bağımsızdır. Bundan dolayı enjeksiyon parametreleri serbestçe kontrol edilebilir.
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Alt 10-02-2008, 01:32 PM   #2
fghi131
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Alt 10-04-2008, 02:49 PM   #3
fghi131
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Alt 10-05-2008, 02:15 PM   #4
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Exclamation 计量泵

计量泵  泵,一般可以理解为输送流体的机械设备。  计量泵(metering pump),可以计量所输送液体的机械,也叫定量泵、比例泵。  通常描述为:计量泵是一种可以满足各种严 格的工艺流程需要,流量可以在0-100%范围内无级调节,用来输送液体(特别是腐蚀性液体)一种特殊容积泵。  分类一:根据过流部分   一、柱塞、活塞式  二、机械隔膜式  三、液压隔膜式  分类二:根据驱动方式  一、电机驱动  二、 电磁驱动  三、气动  分类三:根据工作方式  一、往复式  二、回转式  三、齿轮式  其他的分类 方式:  电控型,气控型,保温型,加热型,高黏度型等。
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Alt 10-07-2008, 08:39 AM   #5
CEO2008GAME
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Alt 10-14-2008, 09:03 PM   #6
fghi131
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Exclamation 隔膜泵

隔膜泵类型的选择  1、隔膜泵的阀体类型选择阀体的选择是隔膜泵选择中最重要的环节。隔膜泵阀体种类很多,常用的有直通单座、直通双座、 角形、隔膜、小流量、三通、偏心旋转、蝶形、套筒式、球形等10种。在选择阀门之前,要对控制过程的介质、 工艺条件和参数进行细心的分析,收集足够的数据,了解系统对隔膜泵的要求,根据所收集的数据来确定所要使用 的阀门类型。在具体选择时,可从以下几方面考虑:  (1)阀芯形状结构主要根据所选择的流量特性和不平衡 力等因素考虑。  (2)耐磨损性当流体介质是含有高浓度磨损性颗粒的悬浮液时,阀芯、阀座接合面每一次关 闭都会受到严重摩擦。因此阀门的流路要光滑,阀的内部材料要坚硬。  (3)耐腐蚀由于介质具有腐蚀性,在 能满足调节功能的情况下,尽量选择结构简单阀门。  (4)介质的温度、压力当介质的温度、压力高且变化大 时,应选用阀芯和阀座的材料受温度、压力变化小的阀门。  (5) 防止闪蒸和空化闪蒸和空化只产生在液体介质。在实际生产过程中,闪蒸和空化不仅影响流量系数的计算,还会形 成振动和噪声,使阀门的使用寿命变短,因此在选择阀门时应防止阀门产生闪蒸和空化。  2、隔膜泵执行机构 的选择  (1)输出力的考虑  执行机构不论是何种类型,其输出力都是用于克服负荷的有效力(主要是指不 平衡力和不平衡力矩加上摩擦力、密封力、重力等有关力的作用)。因此,为了使电动隔膜泵正常工作,配用的执行机构要能产生足够的输出力来克服各种阻力,保证高度密封和阀门的开启。  对于双作用 的气动、液动、电动执行机构,一般都没有复位弹簧。作用力的大小与它的运行方向无关,因此,选择执行机构的 关键在于弄清最大的输出力和电机的转动力矩。对于单作用的气动执行机构,输出力与阀门的开度有关,隔膜泵上 的出现的力也将影响运动特性,因此要求在整个气动隔膜泵的开度范围建立力平衡。  (2)执行机构类型的确定  对执行机构输出力确定后,根据工艺使用环境要求, 选择相应的执行机构。对于现场有防爆要求时,应选用气动执行机构,且接线盒为防爆型,不能选择电动执行机构 。如果没有防爆要求,则气动、电动执行机构都可选用,但从节能方面考虑,应尽量选用电动执行机构。对于液动 执行机构,其使用不如气动、电动执行机构广泛,但具有调节精度高、动作速度快和平稳的特点,因此,在某些情 况下,为了达到较好调节效果,必须选用液动执行机构,如发电厂透明机的速度调节、炼油厂的催化装置反应器的 温度调节控制等。
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Alt 10-15-2008, 10:06 PM   #7
fghi131
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Alt 10-29-2008, 11:05 AM   #8
seoceo2008
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Alt 11-07-2008, 10:55 AM   #9
CEO2008GAME
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Alt 11-08-2008, 06:42 PM   #10
liyanrcaoqiyue
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