高速齿轮泵无气穴现象的综合补偿方法.pdfVIP

高速齿轮泵无气穴现象的综合补偿方法

摘要为了提高外啮合齿轮泵高转速时的气穴性能，提出了一种小侧隙、新环形卸荷槽和大入

油压力的综合补偿方法。通过大、小侧隙下膨胀困油的变化区间、困油容积变化率和困油补偿流量

及其卸荷面积与困油压力模型的建立，实例比较了常规矩形卸荷槽和新环形卸荷槽下的最小困油压

力。结果表明，大侧隙的最大困油膨胀率和膨胀区间的长度均仅为小侧隙下的18.3%；由于卸荷槽

间距的设置不同，大侧隙困油的最大卸荷面积仅为小侧隙下的7.9%；因此，大侧隙较小侧隙的气穴

现象更严重，困油压力波动幅度为小侧隙下的1.93倍。得出了小侧隙、新环形卸荷槽和大入油压力

的综合补偿方法，能有效缓解高速齿轮泵的气穴现象。

关键词高速齿轮泵无气穴现象困油压力膨胀过程小侧隙卸荷槽入油压力

AComprehensiveCompensationMethodforHigh-speedGearPumps

WithouttheCavitationPhenomenon

AbstractInordertoimprovethecavitationperformanceunderhigh-speedforexternalgearpumps,a

comprehensivecompensationmethodwiththesmallbacklash,innovativeannulusrelief-grooveandincreasing

inletoil-pressureisproposed.Basedonallderivedmodelsofthetrapped-oilexpansion-processinterval,

trapped-oilvolumechangerate,compensationflowratefortheexpandedtrapped-oil,reliefareasandtrapped-

oilpressuresdifferentlyunderlargebacklashorsmallbacklash,theminimumtrapped-oilpressuresundercon⁃

ventionalrectangularrelief-grooveandinnovativeannularrelief-groovearecomparedwithanexample.Allre⁃

sultsshowthatthemaximumtrapped-oilexpansionrateandtheexpansionintervalunderthelargebacklashare

only18.3%ofthoseofthesmallbacklash;themaximumrelief-areaofthetrapped-oilinthelargebacklashis

only7.9%ofthatinthesmallbacklashduetodifferentrelief-groovespace;thecavitationphenomenonismore

serious;theripplerangeofthetrapped-oilpressureinthelargebacklashis1.93timesthanthatinthesmall

backlash,etc.Itisconcludedthatthecavitationphenomenonofthehighspeedgearpumpcanbeeffectivelyal⁃

leviatedbythecomprehensivecompensationmethodwiththe