實驗室噴霧干燥機通過開關電源改變用電頻率
字號：T|T
文(wen)章來源：編輯：qiaoyue時(shi)間：2019-06-21 09:28:46
實驗室(shi)噴霧干(gan)(gan)燥機產(chan)(chan)品(pin)(pin)(pin)具有(you)良好(hao)的(de)均勻度、流動性和(he)溶解性，產(chan)(chan)品(pin)(pin)(pin)純(chun)度高(gao)，質量(liang)好(hao)。生產(chan)(chan)過(guo)(guo)程簡化，操作控制方(fang)便(bian)。對于含濕量(liang)40—60%(特(te)殊物料(liao)可(ke)達(da)90%)的(de)液(ye)體(ti)能一次干(gan)(gan)燥成粉粒產(chan)(chan)品(pin)(pin)(pin)，干(gan)(gan)燥后(hou)不需(xu)粉碎和(he)篩(shai)選(xuan)，減少生產(chan)(chan)工序，提高(gao)產(chan)(chan)品(pin)(pin)(pin)純(chun)度。對產(chan)(chan)品(pin)(pin)(pin)粒徑，松密度，水份，在一定范圍(wei)內(nei)可(ke)通(tong)過(guo)(guo)改(gai)變操作條件進行調整，控制和(he)管理(li)都(dou)很方(fang)便(bian)。
在電(dian)(dian)(dian)(dian)(dian)力(li)電(dian)(dian)(dian)(dian)(dian)子技術(shu)的應用及各種(zhong)電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)系統(tong)(tong)中，開(kai)(kai)(kai)關電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)技術(shu)均處于核心地(di)位。對于大型電(dian)(dian)(dian)(dian)(dian)解電(dian)(dian)(dian)(dian)(dian)鍍電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan),傳統(tong)(tong)的電(dian)(dian)(dian)(dian)(dian)路非(fei)常龐(pang)大而笨(ben)重,如(ru)果采用高頓開(kai)(kai)(kai)關電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)技術(shu),其體積和重量都會(hui)大幅度下降(jiang),而且可提高電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)利用效率、節省材料(liao)、降(jiang)低(di)成本。在電(dian)(dian)(dian)(dian)(dian)動汽車和變頻傳動中,更(geng)是離不開(kai)(kai)(kai)開(kai)(kai)(kai)關電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)技術(shu)，實驗室(shi)噴(pen)霧(wu)干燥(zao)機通過開(kai)(kai)關電(dian)(dian)源改(gai)變(bian)用(yong)電(dian)(dian)頻(pin)率,從而達(da)到(dao)近于理想的負載匹配和(he)驅動控制。高頻(pin)開(kai)(kai)關電(dian)(dian)源技(ji)術(shu),更是各種大(da)功(gong)率開(kai)(kai)關電(dian)(dian)源(逆變(bian)焊機、通訊電(dian)(dian)源、高頻(pin)加熱(re)電(dian)(dian)源、激光器電(dian)(dian)源、電(dian)(dian)力操作電(dian)(dian)源等)的技(ji)術(shu)。
在(zai)傳統功(gong)率電(dian)(dian)(dian)子技(ji)(ji)術(shu)(shu)中,控(kong)制(zhi)部分是(shi)按模擬(ni)(ni)(ni)信號(hao)(hao)來(lai)設計(ji)和工作的(de)(de)(de)。在(zai)六(liu)、七十年代,電(dian)(dian)(dian)力電(dian)(dian)(dian)子技(ji)(ji)術(shu)(shu)完全是(shi)建立在(zai)模擬(ni)(ni)(ni)電(dian)(dian)(dian)路基礎上的(de)(de)(de)。但是(shi),現(xian)在(zai)數(shu)字(zi)(zi)式(shi)信號(hao)(hao)、數(shu)字(zi)(zi)電(dian)(dian)(dian)路顯得越來(lai)越重要,數(shu)字(zi)(zi)信號(hao)(hao)處理(li)技(ji)(ji)術(shu)(shu)日趨完善(shan)成熟(shu),顯示出越來(lai)越多的(de)(de)(de)優點:便(bian)于(yu)計(ji)算(suan)機處理(li)控(kong)制(zhi)、避免(mian)模擬(ni)(ni)(ni)信號(hao)(hao)的(de)(de)(de)畸變失真(zhen)、減小(xiao)雜散信號(hao)(hao)的(de)(de)(de)干(gan)擾(rao)(提高抗(kang)干(gan)擾(rao)能(neng)力)、便(bian)于(yu)軟(ruan)件(jian)包調試(shi)和遙感遙測遙調,也便(bian)于(yu)自診斷、容錯等(deng)技(ji)(ji)術(shu)(shu)的(de)(de)(de)植入。所以,在(zai)八、九十年代,對于(yu)各(ge)類電(dian)(dian)(dian)路和系(xi)統的(de)(de)(de)設計(ji)來(lai)說,模擬(ni)(ni)(ni)技(ji)(ji)術(shu)(shu)還是(shi)有用(yong)(yong)的(de)(de)(de),特別是(shi):諸(zhu)如印(yin)制(zhi)版的(de)(de)(de)布圖、電(dian)(dian)(dian)磁兼(jian)容(EMC)問題(ti)以及(ji)功(gong)率因數(shu)修正(PFC)等(deng)問題(ti)的(de)(de)(de)解(jie)決,離不(bu)開模擬(ni)(ni)(ni)技(ji)(ji)術(shu)(shu)的(de)(de)(de)知(zhi)識,但是(shi)對于(yu)智能(neng)化的(de)(de)(de)開關電(dian)(dian)(dian)源,需要用(yong)(yong)計(ji)算(suan)機控(kong)制(zhi)時(shi),數(shu)字(zi)(zi)化技(ji)(ji)術(shu)(shu)就離不(bu)開了。
理(li)論分析和(he)實踐經驗表明,電(dian)氣產品的(de)(de)(de)(de)變壓器、電(dian)感和(he)電(dian)容的(de)(de)(de)(de)體積重量與供(gong)電(dian)頻(pin)(pin)率(lv)的(de)(de)(de)(de)平(ping)方根成(cheng)反比。所以當我們把頻(pin)(pin)率(lv)從工頻(pin)(pin)50Hz提(ti)高(gao)到20kHz,提(ti)高(gao)400倍的(de)(de)(de)(de)話,用(yong)(yong)電(dian)設(she)備的(de)(de)(de)(de)體積重量大體下降(jiang)至工頻(pin)(pin)設(she)計(ji)的(de)(de)(de)(de)5~l0%。無論是逆(ni)變式整流(liu)焊機(ji),還是通訊(xun)電(dian)源(yuan)用(yong)(yong)的(de)(de)(de)(de)開(kai)關(guan)式整流(liu)器,都是基于這一(yi)原理(li)。同(tong)樣(yang),傳(chuan)統“整流(liu)行業”的(de)(de)(de)(de)電(dian)鍍、電(dian)解(jie)、電(dian)加工、充(chong)電(dian)、浮(fu)充(chong)電(dian)、電(dian)力合閘用(yong)(yong)等各(ge)種直流(liu)電(dian)源(yuan)也可以根據這一(yi)原理(li)進行改造, 成(cheng)為(wei)“開(kai)關(guan)變換類電(dian)源(yuan)”,其主要材料可以節(jie)(jie)約(yue)90%或(huo)(huo)更(geng)高(gao),還可節(jie)(jie)電(dian)30%或(huo)(huo)更(geng)多。由(you)于功(gong)率(lv)電(dian)子器件工作頻(pin)(pin)率(lv)上限的(de)(de)(de)(de)逐步提(ti)高(gao),促使(shi)許多原來采用(yong)(yong)電(dian)子管的(de)(de)(de)(de)傳(chuan)統高(gao)頻(pin)(pin)設(she)備固態化(hua),帶來顯著(zhu)節(jie)(jie)能、節(jie)(jie)水、節(jie)(jie)約(yue)材料的(de)(de)(de)(de)經濟效益,更(geng)可體現(xian)技術含量的(de)(de)(de)(de)價值。
儀器是科學技術發(fa)展(zhan)的(de)重(zhong)要(yao)前提和根本保(bao)障。人類發(fa)展(zhan)史上任何一(yi)次大的(de)飛躍都是基于(yu)工具的(de)巨大創(chuang)新(xin)和根本變革驅動(dong)的(de)，作為(wei)“工具”的(de)科學儀器的(de)發(fa)展(zhan)和創(chuang)新(xin)往(wang)往(wang)是催(cui)生(sheng)科技創(chuang)新(xin)的(de)重(zhong)要(yao)要(yao)素。
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