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REXROTH力士樂電磁閥
一、直動式電磁閥
原理:常(chang)閉型通電(dian)時,電(dian)磁(ci)線圈產生電(dian)磁(ci)力把(ba)敞開(kai)件從閥(fa)座(zuo)上提起,閥(fa)門打(da)開(kai);斷電(dian)時,電(dian)磁(ci)力消失,彈簧把(ba)敞開(kai)件壓在閥(fa)座(zuo)上,閥(fa)門敞開(kai)。
特點(dian):在真空、負壓、零壓時(shi)能正常工作(zuo),通徑一般不超(chao)過(guo)25mm。
二、分步直動式電磁閥
原理(li):當入口與出口達到(dao)啟動(dong)壓(ya)差(cha)(cha)時(shi),通電后,電磁力(li)先(xian)導小閥,主閥下腔(qiang)壓(ya)力(li)上升,上腔(qiang)壓(ya)力(li)下降,利用(yong)壓(ya)差(cha)(cha)把主閥向上推(tui)開;斷電時(shi),先(xian)導閥利用(yong)彈簧力(li)或(huo)介質壓(ya)力(li)推(tui)動(dong)關閉件(jian),向下移動(dong),使閥門關閉。
特點:在零壓差或真空、高壓時亦(yi)能可(ke)動(dong)作,但功率較大(da),必須(xu)水平(ping)安(an)裝。
三、間(jian)接先(xian)導式電磁閥
原理:通(tong)電時,電磁力(li)(li)把(ba)先導(dao)孔打開(kai)(kai),上(shang)腔室(shi)壓(ya)力(li)(li)迅速下(xia)(xia)降,在(zai)(zai)敞(chang)開(kai)(kai)件周(zhou)圍形成(cheng)上(shang)低下(xia)(xia)高的壓(ya)差(cha)(cha),流體(ti)壓(ya)力(li)(li)推(tui)動(dong)敞(chang)開(kai)(kai)件向上(shang)移動(dong),閥門打開(kai)(kai);斷電時,彈簧(huang)力(li)(li)把(ba)先導(dao)孔敞(chang)開(kai)(kai),入口壓(ya)力(li)(li)通(tong)過(guo)旁通(tong)孔迅速腔室(shi)在(zai)(zai)關閥件周(zhou)圍形成(cheng)下(xia)(xia)低上(shang)高的壓(ya)差(cha)(cha),流體(ti)壓(ya)力(li)(li)推(tui)動(dong)敞(chang)開(kai)(kai)件向下(xia)(xia)移動(dong),敞(chang)開(kai)(kai)閥門。
特點:體(ti)積小,功率低,流(liu)體(ti)壓(ya)力范圍(wei)上限較高,可(ke)任意安裝但必(bi)須滿(man)足流(liu)體(ti)壓(ya)差條(tiao)件(jian)。
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