一、電子膨脹閥的結構組成
空調系統設計中,電子(zi)膨脹閥作為(wei)電子(zi)控制元(yuan)件,因其精度高,動作快速、準(zhun)確、節能效果明顯等優點(dian),應用廣泛,那么(me)電子(zi)膨脹閥由什么(me)組成(cheng)呢(ni)?
電子膨脹閥有(you)步進電(dian)(dian)(dian)機型和電(dian)(dian)(dian)磁(ci)線圈型兩種結構(gou)形(xing)式,電(dian)(dian)(dian)磁(ci)線圈型嚴格(ge)地說(shuo)是一種電(dian)(dian)(dian)磁(ci)膨脹(zhang)閥(fa)(fa),家用(yong)空調、冰箱(xiang)等(deng)(deng)制冷設備中常說(shuo)的(de)電(dian)(dian)(dian)子膨脹(zhang)閥(fa)(fa)通常指(zhi)的(de)是步進電(dian)(dian)(dian)機型,由閥(fa)(fa)體、閥(fa)(fa)芯、波(bo)紋(wen)管、脈沖步進電(dian)(dian)(dian)機和傳動(dong)機構(gou)等(deng)(deng)部分組(zu)成:
1、閥(fa)(fa)體是指膨脹(zhang)閥(fa)(fa)本身,由針閥(fa)(fa)、磁體及上(shang)下蓋等(deng)部(bu)件組(zu)成,針閥(fa)(fa)的開(kai)度大小(xiao)靠回氣(qi)過(guo)(guo)熱度(通過(guo)(guo)回氣(qi)溫度和壓力檢(jian)測得到)控制,過(guo)(guo)熱度越(yue)大開(kai)度越(yue)大,過(guo)(guo)熱度越(yue)小(xiao)開(kai)度也就(jiu)越(yue)小(xiao)。
2、波紋管(guan)將制冷劑通道(dao)與運動部件隔開,以防制冷劑泄漏。
3、脈沖(chong)步進(jin)電機是驅動機構,主要由線圈、支架(jia)、連接件等(deng)組(zu)成(cheng)。
4、傳動(dong)(dong)(dong)機構(gou)的(de)(de)(de)作用是將(jiang)電(dian)機的(de)(de)(de)旋轉運動(dong)(dong)(dong)轉變為閥芯的(de)(de)(de)往復運動(dong)(dong)(dong)。傳動(dong)(dong)(dong)機構(gou)有兩種(zhong),減速式(shi)(shi)傳動(dong)(dong)(dong)機構(gou)包括齒輪(lun)(lun)副(fu)(兩個(ge)相嚙合的(de)(de)(de)齒輪(lun)(lun)組成(cheng)的(de)(de)(de)基本(ben)結(jie)構(gou))、羅(luo)紋(wen)副(fu)(利用螺紋(wen)旋合實現(xian)連接作用的(de)(de)(de)機械(xie)組合)、傳動(dong)(dong)(dong)桿(gan)等(deng)。直(zhi)動(dong)(dong)(dong)式(shi)(shi)傳動(dong)(dong)(dong)機構(gou)沒有齒輪(lun)(lun)副(fu)。
二、電子膨脹閥的工作原理是什么
電子(zi)(zi)膨脹(zhang)閥(fa)(fa)是(shi)按照(zhao)預(yu)設程序調(diao)節(jie)蒸(zheng)發器供液(ye)量,因屬于電子(zi)(zi)式(shi)調(diao)節(jie)模(mo)式(shi),故(gu)稱為(wei)電子(zi)(zi)膨脹(zhang)閥(fa)(fa),它適應了制冷機電一體化(hua)的(de)發展(zhan)要(yao)求,是(shi)一種(zhong)很有發展(zhan)前(qian)途的(de)自控節(jie)能元件。目前(qian)電子(zi)(zi)膨脹(zhang)閥(fa)(fa)主(zhu)要(yao)有電磁式(shi)膨脹(zhang)閥(fa)(fa)和電動式(shi)膨脹(zhang)閥(fa)(fa)兩種(zhong),兩者(zhe)的(de)工作原理(li)有些不同:
1、電磁式電子膨脹閥內部具(ju)有(you)電(dian)(dian)磁(ci)線圈(quan),通(tong)(tong)過電(dian)(dian)磁(ci)線圈(quan)作(zuo)為(wei)媒(mei)介來(lai)控(kong)制(zhi)系統(tong)流(liu)量。在電(dian)(dian)磁(ci)線圈(quan)通(tong)(tong)電(dian)(dian)之前,閥針(zhen)處于開(kai)啟狀態,在電(dian)(dian)磁(ci)線圈(quan)通(tong)(tong)電(dian)(dian)之后(hou),閥針(zhen)的(de)開(kai)啟程度(du)由電(dian)(dian)磁(ci)線圈(quan)上的(de)電(dian)(dian)壓來(lai)控(kong)制(zhi),由此,電(dian)(dian)磁(ci)線圈(quan)的(de)電(dian)(dian)壓就控(kong)制(zhi)了膨(peng)脹閥的(de)流(liu)量。
2、電(dian)(dian)動(dong)式電(dian)(dian)子膨脹閥就是(shi)利(li)用(yong)步進(jin)(jin)電(dian)(dian)機驅動(dong)的(de),該裝(zhuang)置通(tong)過給(gei)步進(jin)(jin)電(dian)(dian)機提供的(de)邏輯(ji)數字信號來(lai)控制(zhi)進(jin)(jin)內部(bu)的(de)螺紋驅動(dong)閥針(zhen)運動(dong),由此(ci)實現閥門(men)流(liu)量與面積的(de)控制(zhi)。