Parametri di prestazione della pompa a pistone radiale

创建于05.17
性能参数的径向活塞泵
径向活塞泵的主要性能包括压力、排量、速度、效率和使用寿命。主要结构参数包括柱塞的直径和数量、斜盘角度等。
(1) 在径向活塞泵中,阀分配泵的压力较高,一般超过32Mpa,某些产品甚至可达到200MPa;轴向分配泵的压力一般超过20MPa。
(2) 径向活塞泵的排量主要取决于柱塞的直径、有效行程和柱塞的偏心度,以及每个工作循环中每个柱塞的动作次数。
径向活塞泵位移计算的一般公式如下
V=K(π/4)d2hZ×l0-3 (mL/r)                 (5-1)
Where K -- 每个工作周期中每个活塞的动作次数;
D -- plunger diameter, mm;
H -- effective stroke of plunger, mm;
Z -- 油缸的数量。
对于单作用径向活塞泵,由于动作次数 k = 1 和有效行程 H = 2e(E 为偏心距),排量计算公式为
V=(π/4)d2×2e×Z×10-3=(π/2)d2eZ×10-3 (mL/r)       (5-2)
The displacement range of radial piston pump is large, ranging from 0.5 to 5000 ml / R. the commonly used displacement varies with the product structure.
(3) 例如,小排量泵的转速可以超过10000r / min,中排量泵的转速为3000-5000r / min,大规格泵的转速也可以超过10000r / min。
(4) 效率径向活塞泵的容积效率和总效率与泵的工作条件有关。在额定条件下,阀分配泵的容积效率可以达到96% ~ 98%,总效率可以达到85% ~ 88%。
(5) 在正确的条件下(特别是使用适当粘度的工作介质并保持足够的清洁度时),径向活塞泵的服务寿命非常长。但一般来说,径向活塞泵的寿命不如轴向活塞泵长。
(6) 与齿轮泵、叶片泵和螺杆泵相比,柱塞泵的流量脉动和噪音更大。活塞泵的流量脉动是噪音的主要原因。在各种活塞泵中,阀分配活塞泵的噪音水平最高。
The number of plunger has a great influence on the flow pulsation. According to the traditional design criteria, the number of plunger is odd, and the more the plunger, the smaller the flow pulsation. Considering the difficulty of structural arrangement, the number of plunger is generally taken as Z = 3, 5, 7, 9, and uniformly distributed along the circumference. However, because the pressure build-up and oil supply process of valve distribution piston pump are related to the rotation phase of transmission shaft, the pressure difference between inside and outside the working cylinder, and the opening and closing characteristics of valve, the above design criteria of odd number of pistons are not important for this kind of pump. For the sake of manufacturing technology and reducing bearing load, many valve distribution pumps use even number plunger.
(7) 高压大流量活塞泵具有高功率密度和性价比。径向活塞泵的功率密度低于轴向活塞泵,因为其径向尺寸较大。
(8) 主要结构参数 Z、直径 D 和偏心率 e 是三个相互限制的参数,它们与结构类型、性能、强度、刚度和可加工性有关。当考虑到泵的位移、流量脉动和结构技术时,确定柱塞数量 Z 后,可以根据柱塞数量和位移计算柱塞直径 D。一般来说,偏心率 e 可以按如下方式确定:
e=md (mm)                        (5-3)
Where m -- coefficient, M = 0.25-0.5, the smaller value is taken when the working pressure is high, otherwise the larger value is taken.
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