密相氣力輸送系(xi)列

氣力輸送原理

氣(qi)力輸(shu)(shu)送(song)(song)(song)(song)(song)(song)系(xi)統(tong)可分(fen)(fen)類為(wei)(wei)不(bu)同(tong)(tong)的(de)(de)(de)(de)(de)流(liu)(liu)動(dong)型(xing)式(shi)，其中(zhong)兩種主要型(xing)式(shi)是：(a) 稀(xi)相(xiang)(xiang)輸(shu)(shu)送(song)(song)(song)(song)(song)(song)和（b）密(mi)(mi)相(xiang)(xiang)輸(shu)(shu)送(song)(song)(song)(song)(song)(song)每種流(liu)(liu)動(dong)型(xing)式(shi)可按物料(liao)與空氣(qi)的(de)(de)(de)(de)(de)流(liu)(liu)量(liang)(liang)比率(lv)大小分(fen)(fen)類，其比率(lv)也(ye)被(bei)(bei)稱為(wei)(wei)“固氣(qi)比”： μ=ms/mf (1)許多(duo)稀(xi)相(xiang)(xiang)的(de)(de)(de)(de)(de)運行范圍為(wei)(wei)0＜μ＜15，而(er)密(mi)(mi)相(xiang)(xiang)通常是μ＞15。圖(tu)(tu)1所示(shi)(shi)的(de)(de)(de)(de)(de)是典(dian)型(xing)輸(shu)(shu)送(song)(song)(song)(song)(song)(song)狀態圖(tu)(tu)。稀(xi)相(xiang)(xiang)輸(shu)(shu)送(song)(song)(song)(song)(song)(song)可以(yi)被(bei)(bei)認(ren)為(wei)(wei)是一(yi)種完(wan)全(quan)(quan)的(de)(de)(de)(de)(de)懸(xuan)(xuan)浮(fu)(fu)(fu)流(liu)(liu)，而(er)密(mi)(mi)相(xiang)(xiang)輸(shu)(shu)送(song)(song)(song)(song)(song)(song)通常被(bei)(bei)認(ren)為(wei)(wei)是非(fei)懸(xuan)(xuan)浮(fu)(fu)(fu)流(liu)(liu)。然而(er)，如圖(tu)(tu)1所示(shi)(shi)，許多(duo)不(bu)同(tong)(tong)種類的(de)(de)(de)(de)(de)密(mi)(mi)相(xiang)(xiang)（非(fei)懸(xuan)(xuan)浮(fu)(fu)(fu)流(liu)(liu)）依(yi)靠(kao)散(san)料(liao)的(de)(de)(de)(de)(de)料(liao)性(xing)和流(liu)(liu)動(dong)性(xing)存在(zai)。密(mi)(mi)相(xiang)(xiang)輸(shu)(shu)送(song)(song)(song)(song)(song)(song)同(tong)(tong)樣也(ye)能被(bei)(bei)定義為(wei)(wei)輸(shu)(shu)送(song)(song)(song)(song)(song)(song)物料(liao)完(wan)全(quan)(quan)填滿(man)(man)管(guan)道截(jie)面(mian)的(de)(de)(de)(de)(de)一(yi)種輸(shu)(shu)送(song)(song)(song)(song)(song)(song)方式(shi)。稀(xi)相(xiang)(xiang)輸(shu)(shu)送(song)(song)(song)(song)(song)(song)通常需(xu)要使用(yong)大量(liang)(liang)的(de)(de)(de)(de)(de)高(gao)速(su)(su)氣(qi)體。氣(qi)流(liu)(liu)依(yi)靠(kao)升力和推動(dong)力以(yi)離散(san)粒子的(de)(de)(de)(de)(de)形式(shi)攜(xie)帶著物料(liao)。參考圖(tu)(tu)1中(zhong)所述的(de)(de)(de)(de)(de)“懸(xuan)(xuan)浮(fu)(fu)(fu)流(liu)(liu)”，稀(xi)相(xiang)(xiang)系(xi)統(tong)通常是最為(wei)(wei)被(bei)(bei)廣泛應用(yong)的(de)(de)(de)(de)(de)氣(qi)力輸(shu)(shu)送(song)(song)(song)(song)(song)(song)系(xi)統(tong)。由于稀(xi)相(xiang)(xiang)系(xi)統(tong)設計的(de)(de)(de)(de)(de)相(xiang)(xiang)對簡單性(xing)，它們同(tong)(tong)時(shi)(shi)也(ye)被(bei)(bei)頻繁的(de)(de)(de)(de)(de)應用(yong)在(zai)工業領域(yu)。輸(shu)(shu)送(song)(song)(song)(song)(song)(song)氣(qi)體的(de)(de)(de)(de)(de)速(su)(su)度(du)(du)(du)減少到比保(bao)持粒子懸(xuan)(xuan)浮(fu)(fu)(fu)狀態的(de)(de)(de)(de)(de)臨(lin)界(jie)值更小時(shi)(shi)，導致物料(liao)在(zai)輸(shu)(shu)送(song)(song)(song)(song)(song)(song)管(guan)道的(de)(de)(de)(de)(de)橫(heng)截(jie)面(mian)形成(cheng)不(bu)均勻的(de)(de)(de)(de)(de)分(fen)(fen)布。臨(lin)界(jie)氣(qi)體速(su)(su)度(du)(du)(du)被(bei)(bei)稱為(wei)(wei)是水平輸(shu)(shu)送(song)(song)(song)(song)(song)(song)的(de)(de)(de)(de)(de)跳躍速(su)(su)度(du)(du)(du)，垂直輸(shu)(shu)送(song)(song)(song)(song)(song)(song)時(shi)(shi)堵塞(sai)。當(dang)水平管(guan)道中(zhong)的(de)(de)(de)(de)(de)物料(liao)表面(mian)氣(qi)體速(su)(su)度(du)(du)(du)低(di)于突(tu)變速(su)(su)度(du)(du)(du)時(shi)(shi)，輸(shu)(shu)送(song)(song)(song)(song)(song)(song)將會(hui)以(yi)低(di)流(liu)(liu)量(liang)(liang)通過管(guan)道橫(heng)截(jie)面(mian)的(de)(de)(de)(de)(de)上部，在(zai)管(guan)道的(de)(de)(de)(de)(de)剩余(yu)部分(fen)(fen)以(yi)高(gao)濃度(du)(du)(du)低(di)速(su)(su)度(du)(du)(du)的(de)(de)(de)(de)(de)形式(shi)填充。有時(shi)(shi)沿管(guan)道的(de)(de)(de)(de)(de)橫(heng)截(jie)面(mian)會(hui)被(bei)(bei)填滿(man)(man)，而(er)有時(shi)(shi)只是部分(fen)(fen)被(bei)(bei)填滿(man)(man).

實(shi)際應(ying)用中, 按照(zhao)氣(qi)力驅動形式可(ke)以分(fen)為負(fu)壓(ya)和正壓(ya)氣(qi)力輸(shu)送(song)(song)(song), 在(zai)這(zhe)兩種輸(shu)送(song)(song)(song)系統(tong)中, 根(gen)據流動狀態圖再區分(fen)分(fen)為稀(xi)相, 密相和流化態輸(shu)送(song)(song)(song)系統(tong). 除(chu)此之外(wai),根(gen)據喂料不同(tong)分(fen)為連(lian)續(xu)和批(pi)次輸(shu)送(song)(song)(song). 在(zai)高(gao)壓(ya)密相輸(shu)送(song)(song)(song)技術中常采用批(pi)次的壓(ya)力罐進行高(gao)壓(ya)輸(shu)送(song)(song)(song), 同(tong)時, 可(ke)以組(zu)合兩個(ge)壓(ya)力罐設計達到(dao)連(lian)續(xu)的輸(shu)送(song)(song)(song).

密相氣力輸送特(te)點:

● 用(yong)氣量小, 節能

● 無殘留輸送

● 不堵塞, 運行可靠

● 維護費用低

● 適(shi)合(he)于(yu)各類粉粒物料

● 壓力至0. 6m p a可調(diao)

● 適合于柔性化自動生產中的物料高效輸送