密相氣力(li)輸送系列

氣(qi)力輸送原理

氣(qi)(qi)(qi)(qi)(qi)力輸(shu)(shu)(shu)送(song)系統(tong)可分(fen)(fen)類(lei)為不同(tong)的(de)(de)(de)(de)流(liu)動(dong)(dong)型(xing)(xing)式(shi)，其(qi)中(zhong)兩種(zhong)主(zhu)要(yao)型(xing)(xing)式(shi)是(shi)(shi)：(a) 稀(xi)相(xiang)(xiang)(xiang)輸(shu)(shu)(shu)送(song)和(he)（b）密(mi)(mi)相(xiang)(xiang)(xiang)輸(shu)(shu)(shu)送(song)每種(zhong)流(liu)動(dong)(dong)型(xing)(xing)式(shi)可按物(wu)料(liao)與空氣(qi)(qi)(qi)(qi)(qi)的(de)(de)(de)(de)流(liu)量比(bi)率大小分(fen)(fen)類(lei)，其(qi)比(bi)率也(ye)被(bei)(bei)(bei)(bei)稱(cheng)為“固氣(qi)(qi)(qi)(qi)(qi)比(bi)”： μ=ms/mf (1)許(xu)多稀(xi)相(xiang)(xiang)(xiang)的(de)(de)(de)(de)運(yun)行范圍為0＜μ＜15，而密(mi)(mi)相(xiang)(xiang)(xiang)通(tong)常是(shi)(shi)μ＞15。圖(tu)1所(suo)(suo)示的(de)(de)(de)(de)是(shi)(shi)典型(xing)(xing)輸(shu)(shu)(shu)送(song)狀(zhuang)(zhuang)態圖(tu)。稀(xi)相(xiang)(xiang)(xiang)輸(shu)(shu)(shu)送(song)可以被(bei)(bei)(bei)(bei)認(ren)為是(shi)(shi)一種(zhong)完(wan)全的(de)(de)(de)(de)懸浮(fu)流(liu)，而密(mi)(mi)相(xiang)(xiang)(xiang)輸(shu)(shu)(shu)送(song)通(tong)常被(bei)(bei)(bei)(bei)認(ren)為是(shi)(shi)非懸浮(fu)流(liu)。然而，如圖(tu)1所(suo)(suo)示，許(xu)多不同(tong)種(zhong)類(lei)的(de)(de)(de)(de)密(mi)(mi)相(xiang)(xiang)(xiang)（非懸浮(fu)流(liu)）依靠散料(liao)的(de)(de)(de)(de)料(liao)性(xing)(xing)和(he)流(liu)動(dong)(dong)性(xing)(xing)存在。密(mi)(mi)相(xiang)(xiang)(xiang)輸(shu)(shu)(shu)送(song)同(tong)樣也(ye)能被(bei)(bei)(bei)(bei)定義(yi)為輸(shu)(shu)(shu)送(song)物(wu)料(liao)完(wan)全填(tian)滿(man)(man)管(guan)道(dao)截(jie)(jie)面(mian)的(de)(de)(de)(de)一種(zhong)輸(shu)(shu)(shu)送(song)方式(shi)。稀(xi)相(xiang)(xiang)(xiang)輸(shu)(shu)(shu)送(song)通(tong)常需要(yao)使用(yong)(yong)大量的(de)(de)(de)(de)高速(su)氣(qi)(qi)(qi)(qi)(qi)體。氣(qi)(qi)(qi)(qi)(qi)流(liu)依靠升力和(he)推動(dong)(dong)力以離散粒子的(de)(de)(de)(de)形(xing)式(shi)攜帶著物(wu)料(liao)。參考圖(tu)1中(zhong)所(suo)(suo)述的(de)(de)(de)(de)“懸浮(fu)流(liu)”，稀(xi)相(xiang)(xiang)(xiang)系統(tong)通(tong)常是(shi)(shi)最為被(bei)(bei)(bei)(bei)廣泛應(ying)用(yong)(yong)的(de)(de)(de)(de)氣(qi)(qi)(qi)(qi)(qi)力輸(shu)(shu)(shu)送(song)系統(tong)。由于稀(xi)相(xiang)(xiang)(xiang)系統(tong)設計的(de)(de)(de)(de)相(xiang)(xiang)(xiang)對(dui)簡單性(xing)(xing)，它們(men)同(tong)時也(ye)被(bei)(bei)(bei)(bei)頻繁(fan)的(de)(de)(de)(de)應(ying)用(yong)(yong)在工業領(ling)域。輸(shu)(shu)(shu)送(song)氣(qi)(qi)(qi)(qi)(qi)體的(de)(de)(de)(de)速(su)度(du)(du)(du)(du)減(jian)少到比(bi)保持(chi)粒子懸浮(fu)狀(zhuang)(zhuang)態的(de)(de)(de)(de)臨(lin)界值(zhi)更小時，導致物(wu)料(liao)在輸(shu)(shu)(shu)送(song)管(guan)道(dao)的(de)(de)(de)(de)橫(heng)截(jie)(jie)面(mian)形(xing)成(cheng)不均勻的(de)(de)(de)(de)分(fen)(fen)布。臨(lin)界氣(qi)(qi)(qi)(qi)(qi)體速(su)度(du)(du)(du)(du)被(bei)(bei)(bei)(bei)稱(cheng)為是(shi)(shi)水平輸(shu)(shu)(shu)送(song)的(de)(de)(de)(de)跳躍速(su)度(du)(du)(du)(du)，垂(chui)直(zhi)輸(shu)(shu)(shu)送(song)時堵塞。當水平管(guan)道(dao)中(zhong)的(de)(de)(de)(de)物(wu)料(liao)表面(mian)氣(qi)(qi)(qi)(qi)(qi)體速(su)度(du)(du)(du)(du)低(di)于突(tu)變(bian)速(su)度(du)(du)(du)(du)時，輸(shu)(shu)(shu)送(song)將會以低(di)流(liu)量通(tong)過(guo)管(guan)道(dao)橫(heng)截(jie)(jie)面(mian)的(de)(de)(de)(de)上(shang)部(bu)，在管(guan)道(dao)的(de)(de)(de)(de)剩(sheng)余部(bu)分(fen)(fen)以高濃度(du)(du)(du)(du)低(di)速(su)度(du)(du)(du)(du)的(de)(de)(de)(de)形(xing)式(shi)填(tian)充。有時沿(yan)管(guan)道(dao)的(de)(de)(de)(de)橫(heng)截(jie)(jie)面(mian)會被(bei)(bei)(bei)(bei)填(tian)滿(man)(man)，而有時只是(shi)(shi)部(bu)分(fen)(fen)被(bei)(bei)(bei)(bei)填(tian)滿(man)(man).

實際應用中, 按照氣力驅動形式可以(yi)分為負壓(ya)和(he)(he)正壓(ya)氣力輸(shu)送(song)(song), 在這兩(liang)種輸(shu)送(song)(song)系統中, 根(gen)據流動狀(zhuang)態圖再區分分為稀相(xiang)(xiang), 密相(xiang)(xiang)和(he)(he)流化態輸(shu)送(song)(song)系統. 除此之(zhi)外,根(gen)據喂(wei)料不(bu)同分為連(lian)續(xu)和(he)(he)批次輸(shu)送(song)(song). 在高壓(ya)密相(xiang)(xiang)輸(shu)送(song)(song)技術中常采(cai)用批次的(de)(de)壓(ya)力罐(guan)(guan)進行高壓(ya)輸(shu)送(song)(song), 同時, 可以(yi)組合(he)兩(liang)個壓(ya)力罐(guan)(guan)設(she)計達(da)到連(lian)續(xu)的(de)(de)輸(shu)送(song)(song).

密相氣(qi)力(li)輸送(song)特點:

● 用氣量小, 節(jie)能(neng)

● 無殘(can)留(liu)輸送(song)

● 不堵(du)塞(sai), 運行可靠

● 維護費用低(di)

● 適合于各(ge)類粉粒物料

● 壓力(li)至0. 6m p a可調(diao)

● 適合(he)于柔性化自動生產(chan)中的物料(liao)高效輸送