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1、PROPORTIONALVALVES-BASICPRINCIPLESCopyright?EatonHydraulics2000SteveSkinner,EatonHydraulics,Havant,UK比例閥基本原理BASICSYSTEM1)一般認(rèn)為一個簡單的液壓系統(tǒng)由油箱(A)、電動機(jī)(B)、泵(C)、溢流閥(D)、過濾器(E)、流量控制閥(F)、方向控制閥(G)、和油缸(H)組成。2)油缸的運動是由流量控制閥(確定運動的速度)和方向控制閥(油缸運動的方向)控制。ABCDEFHGBASICSYSTEM當(dāng)電磁閥得電時,油缸活塞將伸出和回縮,其速度由流量
2、控制閥確定,而電磁閥不具有控制速度的能力。BASICSYSTEMAthreepositionsolenoidvalvecan:-extendthecylinderBASICSYSTEMAthreepositionsolenoidvalvecan:-extendthecylinder-retractthecylinderBASICSYSTEMAthreepositionsolenoidvalvecan:-extendthecylinder-retractthecylinder-stopthecylinder因此電磁閥的動作非常象一個電路中的開關(guān)在此位置燈
3、是關(guān)閉狀態(tài)....在另外一個位置是開啟狀態(tài),而沒有中間狀態(tài)。andintheotherpositionitisswitchedonbuttherearenointermediatestates.然而眾所周知,另一種形式的開關(guān)能夠用來控制燈泡,調(diào)光開關(guān)However,anothertypeofswitchcanbeusedforcontrollingalightbulbknownasadimmerswitch.在這個例子中,這個開關(guān)能夠被轉(zhuǎn)到全開和全關(guān)的任一位置,來調(diào)整燈泡的亮度Inthiscase,theswitchcanbeturnedtoanypo
4、sitionbetweenfullyoffandfullyontovarythebrightnessofthebulb.Inthiscase,theswitchcanbeturnedtoanypositionbetweenfullyoffandfullyontovarythebrightnessofthebulb.Inthiscase,theswitchcanbeturnedtoanypositionbetweenfullyoffandfullyontovarythebrightnessofthebulb.Inthiscase,theswitchcan
5、beturnedtoanypositionbetweenfullyoffandfullyontovarythebrightnessofthebulb.Inthiscase,theswitchcanbeturnedtoanypositionbetweenfullyoffandfullyontovarythebrightnessofthebulb.Inthiscase,theswitchcanbeturnedtoanypositionbetweenfullyoffandfullyontovarythebrightnessofthebulb.在這個例子中,這
6、個開關(guān)能夠被轉(zhuǎn)到全開和全關(guān)的任一位置,來調(diào)整燈泡的亮度。Inthiscase,theswitchcanbeturnedtoanypositionbetweenfullyoffandfullyontovarythebrightnessofthebulb.Inthiscase,theswitchcanbeturnedtoanypositionbetweenfullyoffandfullyontovarythebrightnessofthebulb.BASICSYSTEM2)閥芯能夠移動到在任一位置,而不僅僅是三個不連續(xù)的位置。閥芯在離開中位的方向仍然確定油
7、缸運動的方向,但閥芯離開中位的距離控制活塞的速度。1)比例方向閥能夠被看作與調(diào)光開關(guān)具有同樣功能。Aproportionaldirectionalvalvecanbethoughtofasthedimmerswitchequivalentofanelectricalswitch.BASICSYSTEM于是在實際上比例閥可以同時作為方向閥和流量閥來使用。Soineffecttheproportionaldirectionalvalveisactingasbothadirectionalvalveandaflowcontrolvalve.SWITCHING
8、SOLENOIDVALVE一個傳統(tǒng)的電磁閥能夠被認(rèn)為是一個簡單的開關(guān)閥。Aconvention