密相氣力輸送系列
氣力(li)輸送(song)原理
氣(qi)力(li)(li)輸(shu)(shu)(shu)(shu)送(song)系統(tong)(tong)可分(fen)類為(wei)不(bu)(bu)同(tong)的(de)(de)(de)(de)流(liu)動(dong)型(xing)(xing)式(shi)(shi)(shi),其(qi)(qi)中(zhong)兩種主要(yao)型(xing)(xing)式(shi)(shi)(shi)是(shi):(a) 稀(xi)(xi)相(xiang)(xiang)(xiang)輸(shu)(shu)(shu)(shu)送(song)和(he)(b)密(mi)相(xiang)(xiang)(xiang)輸(shu)(shu)(shu)(shu)送(song)每種流(liu)動(dong)型(xing)(xing)式(shi)(shi)(shi)可按物(wu)(wu)料(liao)(liao)與空氣(qi)的(de)(de)(de)(de)流(liu)量(liang)比(bi)率大小分(fen)類,其(qi)(qi)比(bi)率也(ye)被稱(cheng)(cheng)為(wei)“固氣(qi)比(bi)”: μ=ms/mf (1)許多稀(xi)(xi)相(xiang)(xiang)(xiang)的(de)(de)(de)(de)運行范圍為(wei)0<μ<15,而密(mi)相(xiang)(xiang)(xiang)通(tong)(tong)常(chang)(chang)是(shi)μ>15。圖(tu)(tu)1所示(shi)的(de)(de)(de)(de)是(shi)典型(xing)(xing)輸(shu)(shu)(shu)(shu)送(song)狀態圖(tu)(tu)。稀(xi)(xi)相(xiang)(xiang)(xiang)輸(shu)(shu)(shu)(shu)送(song)可以(yi)被認為(wei)是(shi)一種完全的(de)(de)(de)(de)懸浮流(liu),而密(mi)相(xiang)(xiang)(xiang)輸(shu)(shu)(shu)(shu)送(song)通(tong)(tong)常(chang)(chang)被認為(wei)是(shi)非(fei)懸浮流(liu)。然而,如圖(tu)(tu)1所示(shi),許多不(bu)(bu)同(tong)種類的(de)(de)(de)(de)密(mi)相(xiang)(xiang)(xiang)(非(fei)懸浮流(liu))依靠散(san)料(liao)(liao)的(de)(de)(de)(de)料(liao)(liao)性(xing)(xing)和(he)流(liu)動(dong)性(xing)(xing)存在。密(mi)相(xiang)(xiang)(xiang)輸(shu)(shu)(shu)(shu)送(song)同(tong)樣(yang)也(ye)能被定(ding)義為(wei)輸(shu)(shu)(shu)(shu)送(song)物(wu)(wu)料(liao)(liao)完全填滿(man)管(guan)(guan)(guan)道(dao)(dao)截面的(de)(de)(de)(de)一種輸(shu)(shu)(shu)(shu)送(song)方式(shi)(shi)(shi)。稀(xi)(xi)相(xiang)(xiang)(xiang)輸(shu)(shu)(shu)(shu)送(song)通(tong)(tong)常(chang)(chang)需要(yao)使用大量(liang)的(de)(de)(de)(de)高(gao)速(su)(su)(su)氣(qi)體。氣(qi)流(liu)依靠升(sheng)力(li)(li)和(he)推動(dong)力(li)(li)以(yi)離散(san)粒(li)子(zi)(zi)的(de)(de)(de)(de)形式(shi)(shi)(shi)攜(xie)帶(dai)著物(wu)(wu)料(liao)(liao)。參考圖(tu)(tu)1中(zhong)所述的(de)(de)(de)(de)“懸浮流(liu)”,稀(xi)(xi)相(xiang)(xiang)(xiang)系統(tong)(tong)通(tong)(tong)常(chang)(chang)是(shi)最(zui)為(wei)被廣泛應用的(de)(de)(de)(de)氣(qi)力(li)(li)輸(shu)(shu)(shu)(shu)送(song)系統(tong)(tong)。由于稀(xi)(xi)相(xiang)(xiang)(xiang)系統(tong)(tong)設計的(de)(de)(de)(de)相(xiang)(xiang)(xiang)對簡單性(xing)(xing),它們同(tong)時(shi)也(ye)被頻(pin)繁的(de)(de)(de)(de)應用在工業領(ling)域。輸(shu)(shu)(shu)(shu)送(song)氣(qi)體的(de)(de)(de)(de)速(su)(su)(su)度(du)減少到比(bi)保持(chi)粒(li)子(zi)(zi)懸浮狀態的(de)(de)(de)(de)臨界(jie)值更小時(shi),導致物(wu)(wu)料(liao)(liao)在輸(shu)(shu)(shu)(shu)送(song)管(guan)(guan)(guan)道(dao)(dao)的(de)(de)(de)(de)橫截面形成不(bu)(bu)均勻的(de)(de)(de)(de)分(fen)布(bu)。臨界(jie)氣(qi)體速(su)(su)(su)度(du)被稱(cheng)(cheng)為(wei)是(shi)水(shui)平輸(shu)(shu)(shu)(shu)送(song)的(de)(de)(de)(de)跳躍速(su)(su)(su)度(du),垂直輸(shu)(shu)(shu)(shu)送(song)時(shi)堵塞。當水(shui)平管(guan)(guan)(guan)道(dao)(dao)中(zhong)的(de)(de)(de)(de)物(wu)(wu)料(liao)(liao)表面氣(qi)體速(su)(su)(su)度(du)低于突變(bian)速(su)(su)(su)度(du)時(shi),輸(shu)(shu)(shu)(shu)送(song)將會(hui)以(yi)低流(liu)量(liang)通(tong)(tong)過管(guan)(guan)(guan)道(dao)(dao)橫截面的(de)(de)(de)(de)上部,在管(guan)(guan)(guan)道(dao)(dao)的(de)(de)(de)(de)剩余(yu)部分(fen)以(yi)高(gao)濃(nong)度(du)低速(su)(su)(su)度(du)的(de)(de)(de)(de)形式(shi)(shi)(shi)填充。有時(shi)沿管(guan)(guan)(guan)道(dao)(dao)的(de)(de)(de)(de)橫截面會(hui)被填滿(man),而有時(shi)只是(shi)部分(fen)被填滿(man).
實(shi)際應(ying)用中(zhong), 按照氣力(li)驅動(dong)形式可以分(fen)(fen)為負(fu)壓(ya)(ya)和(he)正壓(ya)(ya)氣力(li)輸(shu)送, 在這兩種(zhong)輸(shu)送系(xi)統中(zhong), 根據(ju)流動(dong)狀態圖(tu)再區分(fen)(fen)分(fen)(fen)為稀相(xiang), 密相(xiang)和(he)流化態輸(shu)送系(xi)統. 除(chu)此(ci)之(zhi)外,根據(ju)喂料不同分(fen)(fen)為連續(xu)和(he)批(pi)次(ci)(ci)輸(shu)送. 在高(gao)壓(ya)(ya)密相(xiang)輸(shu)送技術中(zhong)常(chang)采(cai)用批(pi)次(ci)(ci)的壓(ya)(ya)力(li)罐(guan)進行(xing)高(gao)壓(ya)(ya)輸(shu)送, 同時, 可以組合(he)兩個壓(ya)(ya)力(li)罐(guan)設(she)計(ji)達到連續(xu)的輸(shu)送.
密相氣力輸送特點:
● 用氣量小(xiao), 節(jie)能
● 無殘留輸送
● 不堵塞(sai), 運行(xing)可(ke)靠
● 維(wei)護費用低
● 適合于各類(lei)粉粒(li)物料
● 壓力至(zhi)0. 6m p a可(ke)調
● 適合于柔性化自動生產中的物料高效輸送