密相气力输(shu)送系列

气(qi)力输(shu)送原理

气(qi)(qi)(qi)力(li)输(shu)送(song)(song)(song)系(xi)统(tong)可(ke)分(fen)(fen)(fen)(fen)类为不同(tong)的(de)(de)(de)(de)(de)(de)(de)(de)流(liu)(liu)动(dong)型式(shi)(shi)，其中两种(zhong)主要型式(shi)(shi)是(shi)(shi)(shi)(shi)(shi)：(a) 稀(xi)相(xiang)输(shu)送(song)(song)(song)和(he)(he)（b）密相(xiang)输(shu)送(song)(song)(song)每(mei)种(zhong)流(liu)(liu)动(dong)型式(shi)(shi)可(ke)按(an)物(wu)料(liao)(liao)(liao)与(yu)空气(qi)(qi)(qi)的(de)(de)(de)(de)(de)(de)(de)(de)流(liu)(liu)量比(bi)(bi)率大小分(fen)(fen)(fen)(fen)类，其比(bi)(bi)率也(ye)被(bei)(bei)(bei)称(cheng)为“固气(qi)(qi)(qi)比(bi)(bi)”： μ=ms/mf (1)许多稀(xi)相(xiang)的(de)(de)(de)(de)(de)(de)(de)(de)运行范围为0＜μ＜15，而(er)密相(xiang)通(tong)常(chang)是(shi)(shi)(shi)(shi)(shi)μ＞15。图1所示的(de)(de)(de)(de)(de)(de)(de)(de)是(shi)(shi)(shi)(shi)(shi)典型输(shu)送(song)(song)(song)状态(tai)图。稀(xi)相(xiang)输(shu)送(song)(song)(song)可(ke)以被(bei)(bei)(bei)认(ren)为是(shi)(shi)(shi)(shi)(shi)一种(zhong)完(wan)全(quan)的(de)(de)(de)(de)(de)(de)(de)(de)悬(xuan)浮(fu)(fu)流(liu)(liu)，而(er)密相(xiang)输(shu)送(song)(song)(song)通(tong)常(chang)被(bei)(bei)(bei)认(ren)为是(shi)(shi)(shi)(shi)(shi)非悬(xuan)浮(fu)(fu)流(liu)(liu)。然而(er)，如图1所示，许多不同(tong)种(zhong)类的(de)(de)(de)(de)(de)(de)(de)(de)密相(xiang)（非悬(xuan)浮(fu)(fu)流(liu)(liu)）依靠(kao)散料(liao)(liao)(liao)的(de)(de)(de)(de)(de)(de)(de)(de)料(liao)(liao)(liao)性(xing)(xing)和(he)(he)流(liu)(liu)动(dong)性(xing)(xing)存(cun)在(zai)。密相(xiang)输(shu)送(song)(song)(song)同(tong)样也(ye)能被(bei)(bei)(bei)定义为输(shu)送(song)(song)(song)物(wu)料(liao)(liao)(liao)完(wan)全(quan)填(tian)满管(guan)(guan)道截(jie)面的(de)(de)(de)(de)(de)(de)(de)(de)一种(zhong)输(shu)送(song)(song)(song)方式(shi)(shi)。稀(xi)相(xiang)输(shu)送(song)(song)(song)通(tong)常(chang)需要使用大量的(de)(de)(de)(de)(de)(de)(de)(de)高(gao)速气(qi)(qi)(qi)体(ti)(ti)。气(qi)(qi)(qi)流(liu)(liu)依靠(kao)升(sheng)力(li)和(he)(he)推(tui)动(dong)力(li)以离散粒子的(de)(de)(de)(de)(de)(de)(de)(de)形式(shi)(shi)携带(dai)着物(wu)料(liao)(liao)(liao)。参考图1中所述(shu)的(de)(de)(de)(de)(de)(de)(de)(de)“悬(xuan)浮(fu)(fu)流(liu)(liu)”，稀(xi)相(xiang)系(xi)统(tong)通(tong)常(chang)是(shi)(shi)(shi)(shi)(shi)最为被(bei)(bei)(bei)广泛(fan)应(ying)(ying)用的(de)(de)(de)(de)(de)(de)(de)(de)气(qi)(qi)(qi)力(li)输(shu)送(song)(song)(song)系(xi)统(tong)。由于稀(xi)相(xiang)系(xi)统(tong)设计的(de)(de)(de)(de)(de)(de)(de)(de)相(xiang)对简单性(xing)(xing)，它们同(tong)时(shi)也(ye)被(bei)(bei)(bei)频繁的(de)(de)(de)(de)(de)(de)(de)(de)应(ying)(ying)用在(zai)工(gong)业领域(yu)。输(shu)送(song)(song)(song)气(qi)(qi)(qi)体(ti)(ti)的(de)(de)(de)(de)(de)(de)(de)(de)速度(du)(du)减少到比(bi)(bi)保持粒子悬(xuan)浮(fu)(fu)状态(tai)的(de)(de)(de)(de)(de)(de)(de)(de)临(lin)界值更小时(shi)，导(dao)致(zhi)物(wu)料(liao)(liao)(liao)在(zai)输(shu)送(song)(song)(song)管(guan)(guan)道的(de)(de)(de)(de)(de)(de)(de)(de)横截(jie)面形成(cheng)不均匀的(de)(de)(de)(de)(de)(de)(de)(de)分(fen)(fen)(fen)(fen)布。临(lin)界气(qi)(qi)(qi)体(ti)(ti)速度(du)(du)被(bei)(bei)(bei)称(cheng)为是(shi)(shi)(shi)(shi)(shi)水(shui)平(ping)输(shu)送(song)(song)(song)的(de)(de)(de)(de)(de)(de)(de)(de)跳跃速度(du)(du)，垂直输(shu)送(song)(song)(song)时(shi)堵塞。当水(shui)平(ping)管(guan)(guan)道中的(de)(de)(de)(de)(de)(de)(de)(de)物(wu)料(liao)(liao)(liao)表面气(qi)(qi)(qi)体(ti)(ti)速度(du)(du)低于突变(bian)速度(du)(du)时(shi)，输(shu)送(song)(song)(song)将会(hui)以低流(liu)(liu)量通(tong)过管(guan)(guan)道横截(jie)面的(de)(de)(de)(de)(de)(de)(de)(de)上(shang)部(bu)，在(zai)管(guan)(guan)道的(de)(de)(de)(de)(de)(de)(de)(de)剩余部(bu)分(fen)(fen)(fen)(fen)以高(gao)浓度(du)(du)低速度(du)(du)的(de)(de)(de)(de)(de)(de)(de)(de)形式(shi)(shi)填(tian)充。有(you)时(shi)沿管(guan)(guan)道的(de)(de)(de)(de)(de)(de)(de)(de)横截(jie)面会(hui)被(bei)(bei)(bei)填(tian)满，而(er)有(you)时(shi)只是(shi)(shi)(shi)(shi)(shi)部(bu)分(fen)(fen)(fen)(fen)被(bei)(bei)(bei)填(tian)满.

实际应用中(zhong), 按(an)照气力驱动形式可以(yi)分(fen)为负压和正压气力输(shu)(shu)送(song), 在这两种输(shu)(shu)送(song)系统中(zhong), 根据流动状态图再区(qu)分(fen)分(fen)为稀(xi)相(xiang), 密(mi)相(xiang)和流化态输(shu)(shu)送(song)系统. 除此之外,根据喂(wei)料不同(tong)分(fen)为连(lian)续和批次输(shu)(shu)送(song). 在高(gao)压密(mi)相(xiang)输(shu)(shu)送(song)技术(shu)中(zhong)常采用批次的压力罐(guan)进行高(gao)压输(shu)(shu)送(song), 同(tong)时, 可以(yi)组合两个压力罐(guan)设计达(da)到连(lian)续的输(shu)(shu)送(song).

密相气力输送特点:

● 用气量小, 节能

● 无残留输送

● 不堵塞, 运行(xing)可靠

● 维护费用低

● 适(shi)合(he)于各类粉(fen)粒物料

● 压力(li)至0. 6m p a可调

● 适合于柔性化自动生产中(zhong)的物料高效输送(song)