德国Rexroth力士乐齿轮泵结构简介
Rexroth Rexroth solenoid valves, proportional valves, valve, piston pumps, gear pumps, fuel pumps, we often make a great product, our company registered since 2006, already has nearly 10 years of sales experience, we rent area 20 square meters to 126 square meters, the size of the company continued to expand, with the witness of time, so we have more and more responsible for the quality of service staff, welcomed the new and old customers to view.
Granville West industrial products, instruments and spare parts suppliers
Our advantage:
1) wide channels, the domestic agent or a customer to protect the manufacturers do not sell products, as long as you can provide a model, we can also be purchased from the German distributor.
2) reasonable price, bypassing the layers of agents, to maximize the profit to customers.
3) direct procurement from the German manufacturer, to ensure that all products are original authentic.
德国Rexroth力士乐齿轮泵结构简介
1-泵体(Housing);2.主动齿轮(Driver Gear);3-从动齿轮(Driven Gear)
泵体内相互啮合的主、从动齿轮2和3与两端盖及泵体一起构成密封工作容积,齿轮的啮合点将左、右两腔隔开,形成了吸、压油腔,当齿轮按图示方向旋转时,右侧吸油腔内的轮齿脱离啮合,密封工作腔容积不断增大,形成部分真空,油液在大气压力作用下从油箱经吸油管进入吸油腔,并被旋转的轮齿带入左侧的压油腔。左侧压油腔内的轮齿不断进入啮合,使密封工作腔容积减小,油液受到挤压被排往系统,这就是齿轮泵的吸油和压油过程。在齿轮泵的啮合过程中,啮合点沿啮合线,把吸油区和压油区分开。
Rexroth齿轮泵均采用修正渐开线齿形,用活动月牙板将高、低压腔分开,并在径向形成压力补偿,使得内外齿齿顶与月牙板之间形成几无间隙的密封,轴向动补偿盘则保证轴向间隙的良好密封,使得该泵的内泄漏减至zui低。低压12Mpa、中压21Mpa、高压33 Mpa。此结构容积效率高、结构复杂,制造成本高。他适用于输送各种轻质、挥发性液体,直至重质、粘稠液体,甚至半固态液体。广泛应用于石油、化工、油脂、涂料等行业。目前有泊头市宏誉泵阀有限公司加工生产。Rexroth力士乐齿轮泵REXROTH齿轮泵是采用齿轮内啮合原理,Rexroth内外齿轮节圆紧靠一边,另一边被泵盖上“月牙板”隔开。主轴上的主动内齿带动外齿轮同向转动,在进口处轮齿相互分离形成负压而吸入液体,轮齿在出口处不断嵌入啮合而将液体挤压输出。由于这种*的结构,所以特别适用于输送粘度大的介质,粘度范围为0.2-100000cp。本系列泵可反向输送,只要更换电机转向即可。该泵泵体可转向,进出口位置成直角,便于选配进出口位置; NCB-BW泵在泵体、端盖、轴承座间都有连接方便的保温或冷却介质的进出接口。连接形式有乔式、直连式;材质有碳钢、不锈钢;密封形式有填料密封、机械密封;所配电机有普通电机、防爆电机。该泵特点:无困料现象、输出平稳、效率高、噪音小、使用寿命长优点。
力士乐齿轮泵的困油现象及消除措施
径向不平衡力 Radial Unbalance Force
在Rexroth齿轮泵中,油液作用在轮外缘的压力是不均匀的,从低压腔到高压腔,压力沿齿轮旋转的方向逐齿递增,因此,齿轮和轴受到径向不平衡力的作用,工作压力越高,径向不平衡力越大,径向不平衡力很大时,能使泵轴弯曲,导致齿顶压向定子的低压端,使定子偏磨,同时也加速轴承的磨损,降低轴承使用寿命。为了减小径向不平衡力的影响,常采取缩小压油口的办法,使压油腔的压力仅作用在一个齿到两个齿的范围内,同时,适当增大径向间隙,使齿顶不与定子内表面产生金属接触,并在支撑上多采用滚针轴承或滑动轴承。
Rexroth齿轮泵的泄漏通道及端面间隙的自动补偿Leakage Passage and Automatic Compensating of End Face Clearance
在液压泵中,运动件间的密封是靠微小间隙密封的,这些微小间隙从运动学上形成摩擦副,同时,高压腔的油液通过间隙向低压腔的泄漏是不可避免的;齿轮泵压油腔的压力油可通过三条途经泄漏到吸油腔去:一是通过齿轮啮合线处的间隙——齿侧间隙(Meshing-Teeth Side Clearance),二是通过泵体定子环内孔和齿顶间的径向间隙——齿顶间隙(teeth Tip clearance),三是通过齿轮两端面和侧板间的间隙——端面间隙(Side Plates-end Face Clearance)。在这三类间隙中,端面间隙的泄漏量zui大,压力越高,由间隙泄漏的液压油就愈多。因此,为了提高齿轮泵的压力和容积效率,实现齿轮泵的高压化,需要从结构上来取措施,对端面间隙进行自动补偿。
通常采用的自动补偿端面间隙装置有:浮动轴套式(Floating Bush Bearing)或弹性侧板式(Elastic Side Plate)两种。,其原理都是引入压力油使轴套或侧板紧贴在齿轮端面上,压力愈高,间隙愈小,可自动补偿端面磨损和减小间隙。齿轮泵的浮动轴套是浮动安装的,轴套外侧的空腔与泵的压油腔相通,当泵工作时,浮动轴套受油压的作用而压向齿轮端面,将齿轮两侧面压紧,从而补偿了端面间隙。
德国Rexroth力士乐齿轮泵结构简介
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