密(mi)相氣(qi)力輸送系列

氣力輸送(song)原理

氣(qi)(qi)(qi)(qi)(qi)力(li)輸(shu)(shu)送(song)(song)(song)系統可(ke)分(fen)類(lei)為(wei)不(bu)同(tong)的(de)(de)(de)(de)(de)(de)流(liu)(liu)(liu)(liu)(liu)動型(xing)式(shi)(shi)，其(qi)中(zhong)(zhong)兩種(zhong)主要型(xing)式(shi)(shi)是：(a) 稀(xi)(xi)相(xiang)(xiang)(xiang)輸(shu)(shu)送(song)(song)(song)和（b）密(mi)(mi)(mi)(mi)相(xiang)(xiang)(xiang)輸(shu)(shu)送(song)(song)(song)每種(zhong)流(liu)(liu)(liu)(liu)(liu)動型(xing)式(shi)(shi)可(ke)按物(wu)料與(yu)空氣(qi)(qi)(qi)(qi)(qi)的(de)(de)(de)(de)(de)(de)流(liu)(liu)(liu)(liu)(liu)量比(bi)率大(da)小(xiao)分(fen)類(lei)，其(qi)比(bi)率也(ye)被(bei)稱(cheng)為(wei)“固氣(qi)(qi)(qi)(qi)(qi)比(bi)”： μ=ms/mf (1)許多稀(xi)(xi)相(xiang)(xiang)(xiang)的(de)(de)(de)(de)(de)(de)運行范圍(wei)為(wei)0＜μ＜15，而密(mi)(mi)(mi)(mi)相(xiang)(xiang)(xiang)通(tong)(tong)常(chang)是μ＞15。圖(tu)1所(suo)示的(de)(de)(de)(de)(de)(de)是典型(xing)輸(shu)(shu)送(song)(song)(song)狀態圖(tu)。稀(xi)(xi)相(xiang)(xiang)(xiang)輸(shu)(shu)送(song)(song)(song)可(ke)以被(bei)認(ren)為(wei)是一(yi)種(zhong)完全(quan)(quan)的(de)(de)(de)(de)(de)(de)懸(xuan)(xuan)浮(fu)流(liu)(liu)(liu)(liu)(liu)，而密(mi)(mi)(mi)(mi)相(xiang)(xiang)(xiang)輸(shu)(shu)送(song)(song)(song)通(tong)(tong)常(chang)被(bei)認(ren)為(wei)是非(fei)懸(xuan)(xuan)浮(fu)流(liu)(liu)(liu)(liu)(liu)。然而，如圖(tu)1所(suo)示，許多不(bu)同(tong)種(zhong)類(lei)的(de)(de)(de)(de)(de)(de)密(mi)(mi)(mi)(mi)相(xiang)(xiang)(xiang)（非(fei)懸(xuan)(xuan)浮(fu)流(liu)(liu)(liu)(liu)(liu)）依(yi)靠散(san)(san)料的(de)(de)(de)(de)(de)(de)料性和流(liu)(liu)(liu)(liu)(liu)動性存在。密(mi)(mi)(mi)(mi)相(xiang)(xiang)(xiang)輸(shu)(shu)送(song)(song)(song)同(tong)樣也(ye)能被(bei)定義為(wei)輸(shu)(shu)送(song)(song)(song)物(wu)料完全(quan)(quan)填滿(man)管道(dao)(dao)截(jie)面(mian)(mian)(mian)的(de)(de)(de)(de)(de)(de)一(yi)種(zhong)輸(shu)(shu)送(song)(song)(song)方式(shi)(shi)。稀(xi)(xi)相(xiang)(xiang)(xiang)輸(shu)(shu)送(song)(song)(song)通(tong)(tong)常(chang)需(xu)要使用(yong)(yong)大(da)量的(de)(de)(de)(de)(de)(de)高(gao)速(su)(su)(su)(su)氣(qi)(qi)(qi)(qi)(qi)體。氣(qi)(qi)(qi)(qi)(qi)流(liu)(liu)(liu)(liu)(liu)依(yi)靠升力(li)和推動力(li)以離散(san)(san)粒(li)子(zi)的(de)(de)(de)(de)(de)(de)形(xing)式(shi)(shi)攜帶著(zhu)物(wu)料。參考圖(tu)1中(zhong)(zhong)所(suo)述的(de)(de)(de)(de)(de)(de)“懸(xuan)(xuan)浮(fu)流(liu)(liu)(liu)(liu)(liu)”，稀(xi)(xi)相(xiang)(xiang)(xiang)系統通(tong)(tong)常(chang)是最為(wei)被(bei)廣泛應(ying)用(yong)(yong)的(de)(de)(de)(de)(de)(de)氣(qi)(qi)(qi)(qi)(qi)力(li)輸(shu)(shu)送(song)(song)(song)系統。由于稀(xi)(xi)相(xiang)(xiang)(xiang)系統設計的(de)(de)(de)(de)(de)(de)相(xiang)(xiang)(xiang)對簡單性，它們同(tong)時(shi)也(ye)被(bei)頻繁的(de)(de)(de)(de)(de)(de)應(ying)用(yong)(yong)在工(gong)業領(ling)域(yu)。輸(shu)(shu)送(song)(song)(song)氣(qi)(qi)(qi)(qi)(qi)體的(de)(de)(de)(de)(de)(de)速(su)(su)(su)(su)度(du)減少到比(bi)保持粒(li)子(zi)懸(xuan)(xuan)浮(fu)狀態的(de)(de)(de)(de)(de)(de)臨界值更小(xiao)時(shi)，導致物(wu)料在輸(shu)(shu)送(song)(song)(song)管道(dao)(dao)的(de)(de)(de)(de)(de)(de)橫截(jie)面(mian)(mian)(mian)形(xing)成不(bu)均勻的(de)(de)(de)(de)(de)(de)分(fen)布。臨界氣(qi)(qi)(qi)(qi)(qi)體速(su)(su)(su)(su)度(du)被(bei)稱(cheng)為(wei)是水平(ping)輸(shu)(shu)送(song)(song)(song)的(de)(de)(de)(de)(de)(de)跳躍速(su)(su)(su)(su)度(du)，垂直輸(shu)(shu)送(song)(song)(song)時(shi)堵(du)塞。當水平(ping)管道(dao)(dao)中(zhong)(zhong)的(de)(de)(de)(de)(de)(de)物(wu)料表面(mian)(mian)(mian)氣(qi)(qi)(qi)(qi)(qi)體速(su)(su)(su)(su)度(du)低于突變速(su)(su)(su)(su)度(du)時(shi)，輸(shu)(shu)送(song)(song)(song)將會以低流(liu)(liu)(liu)(liu)(liu)量通(tong)(tong)過管道(dao)(dao)橫截(jie)面(mian)(mian)(mian)的(de)(de)(de)(de)(de)(de)上部(bu)(bu)，在管道(dao)(dao)的(de)(de)(de)(de)(de)(de)剩(sheng)余部(bu)(bu)分(fen)以高(gao)濃(nong)度(du)低速(su)(su)(su)(su)度(du)的(de)(de)(de)(de)(de)(de)形(xing)式(shi)(shi)填充。有時(shi)沿管道(dao)(dao)的(de)(de)(de)(de)(de)(de)橫截(jie)面(mian)(mian)(mian)會被(bei)填滿(man)，而有時(shi)只是部(bu)(bu)分(fen)被(bei)填滿(man).

實(shi)際應用(yong)中, 按照(zhao)氣力驅動形式可(ke)以分(fen)為負壓(ya)(ya)和(he)正壓(ya)(ya)氣力輸(shu)(shu)(shu)送(song), 在這兩種輸(shu)(shu)(shu)送(song)系(xi)統(tong)中, 根(gen)據流(liu)(liu)動狀態(tai)圖再區分(fen)分(fen)為稀相, 密(mi)相和(he)流(liu)(liu)化態(tai)輸(shu)(shu)(shu)送(song)系(xi)統(tong). 除此之外,根(gen)據喂(wei)料不同(tong)分(fen)為連續和(he)批次(ci)輸(shu)(shu)(shu)送(song). 在高(gao)(gao)壓(ya)(ya)密(mi)相輸(shu)(shu)(shu)送(song)技術中常采用(yong)批次(ci)的壓(ya)(ya)力罐(guan)進行高(gao)(gao)壓(ya)(ya)輸(shu)(shu)(shu)送(song), 同(tong)時, 可(ke)以組合(he)兩個壓(ya)(ya)力罐(guan)設計達到連續的輸(shu)(shu)(shu)送(song).

密(mi)相(xiang)氣(qi)力輸送特點:

● 用(yong)氣量小, 節能

● 無殘留輸送

● 不(bu)堵塞, 運行可靠(kao)

● 維護費用低

● 適合于各類(lei)粉粒物(wu)料

● 壓(ya)力至(zhi)0. 6m p a可(ke)調

● 適合于柔性化自動生產中(zhong)的物(wu)料(liao)高(gao)效(xiao)輸送