一、電子膨脹閥的結構組成

空調系統設計中，電(dian)(dian)子膨(peng)脹(zhang)閥作為(wei)電(dian)(dian)子控制元件，因其(qi)精度高，動作快速、準確、節能效果明顯等(deng)優點，應用(yong)廣泛，那么(me)電(dian)(dian)子膨(peng)脹(zhang)閥由(you)什么(me)組成(cheng)呢？

電子膨脹閥有步(bu)進(jin)電(dian)(dian)機型和電(dian)(dian)磁線(xian)圈(quan)(quan)型兩種(zhong)(zhong)結構形式，電(dian)(dian)磁線(xian)圈(quan)(quan)型嚴(yan)格(ge)地說是一種(zhong)(zhong)電(dian)(dian)磁膨(peng)脹(zhang)閥(fa)，家用空調、冰箱等(deng)制冷設備中常說的電(dian)(dian)子膨(peng)脹(zhang)閥(fa)通常指的是步(bu)進(jin)電(dian)(dian)機型，由閥(fa)體、閥(fa)芯、波紋管、脈(mo)沖步(bu)進(jin)電(dian)(dian)機和傳動機構等(deng)部分(fen)組成(cheng)：

1、閥體是(shi)指膨脹閥本身(shen)，由針閥、磁(ci)體及上下蓋(gai)等部件組(zu)成，針閥的開(kai)度(du)(du)大小(xiao)靠回氣過熱(re)(re)(re)度(du)(du)（通(tong)過回氣溫度(du)(du)和壓力檢測得到）控(kong)制，過熱(re)(re)(re)度(du)(du)越大開(kai)度(du)(du)越大，過熱(re)(re)(re)度(du)(du)越小(xiao)開(kai)度(du)(du)也就越小(xiao)。

2、波紋管將(jiang)制(zhi)冷劑通道與(yu)運動部件隔(ge)開，以防(fang)制(zhi)冷劑泄漏(lou)。

3、脈沖步進電機是驅動(dong)機構，主要(yao)由線圈、支架、連接件等組成。

4、傳(chuan)動(dong)(dong)機(ji)構(gou)的(de)作用是(shi)將電機(ji)的(de)旋(xuan)轉運(yun)動(dong)(dong)轉變為閥芯的(de)往(wang)復運(yun)動(dong)(dong)。傳(chuan)動(dong)(dong)機(ji)構(gou)有兩(liang)(liang)種，減速式傳(chuan)動(dong)(dong)機(ji)構(gou)包括齒輪副(fu)（兩(liang)(liang)個相嚙合的(de)齒輪組成的(de)基本結構(gou)）、羅紋副(fu)（利用螺紋旋(xuan)合實現連(lian)接作用的(de)機(ji)械組合）、傳(chuan)動(dong)(dong)桿(gan)等。直動(dong)(dong)式傳(chuan)動(dong)(dong)機(ji)構(gou)沒有齒輪副(fu)。

二、電子膨脹閥的工作原理是什么

電(dian)(dian)(dian)(dian)子(zi)膨(peng)脹(zhang)閥是按照預設程序調節(jie)蒸發(fa)器供液量(liang)，因屬(shu)于電(dian)(dian)(dian)(dian)子(zi)式(shi)調節(jie)模式(shi)，故稱為電(dian)(dian)(dian)(dian)子(zi)膨(peng)脹(zhang)閥，它適(shi)應了制冷機電(dian)(dian)(dian)(dian)一(yi)體化(hua)的發(fa)展要(yao)求，是一(yi)種很有(you)(you)發(fa)展前途的自控節(jie)能元件。目前電(dian)(dian)(dian)(dian)子(zi)膨(peng)脹(zhang)閥主要(yao)有(you)(you)電(dian)(dian)(dian)(dian)磁(ci)式(shi)膨(peng)脹(zhang)閥和電(dian)(dian)(dian)(dian)動式(shi)膨(peng)脹(zhang)閥兩種，兩者的工(gong)作原理有(you)(you)些不(bu)同：

1、電磁式電子膨脹閥內部具有電(dian)(dian)磁(ci)線(xian)圈(quan)，通(tong)(tong)過(guo)電(dian)(dian)磁(ci)線(xian)圈(quan)作為媒介來(lai)(lai)控制系統流量(liang)。在電(dian)(dian)磁(ci)線(xian)圈(quan)通(tong)(tong)電(dian)(dian)之(zhi)前，閥針(zhen)處于開啟(qi)狀態，在電(dian)(dian)磁(ci)線(xian)圈(quan)通(tong)(tong)電(dian)(dian)之(zhi)后，閥針(zhen)的(de)(de)開啟(qi)程度由(you)電(dian)(dian)磁(ci)線(xian)圈(quan)上的(de)(de)電(dian)(dian)壓來(lai)(lai)控制，由(you)此，電(dian)(dian)磁(ci)線(xian)圈(quan)的(de)(de)電(dian)(dian)壓就控制了膨脹閥的(de)(de)流量(liang)。

2、電(dian)動(dong)(dong)式電(dian)子膨脹閥(fa)就是利(li)用步(bu)進(jin)電(dian)機驅動(dong)(dong)的(de)(de)，該(gai)裝置通過給步(bu)進(jin)電(dian)機提供的(de)(de)邏(luo)輯數字信號來(lai)控制進(jin)內部(bu)的(de)(de)螺紋(wen)驅動(dong)(dong)閥(fa)針運動(dong)(dong)，由此實現閥(fa)門流量與面積的(de)(de)控制。