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为提高超小型泵性能和实用性,研究了其中前盖板对叶轮水力性能的影响。基于传统方法设计了两种超小型泵叶轮,其中一个为闭式,另一个为半开式。在转速3 000~10 000 r.m i-n 1的范围内进行实验,测定了超小型泵的水力性能。对半开式叶轮,在0.2~0.8 mm间调整叶尖和前泵盖之间的轴向间隙,以考察其对泵水力性能的影响。试验结果表明:两种超小型泵的效率(闭式叶轮:51%,半开式叶轮:47%)均高于以往统计的泵效率值;由于机械密封等外部损失所占比重大,泵效率随雷诺数减小而降低,而内部效率则接近一个定值;随轴向间隙扩大,超小型泵的扬程系数、功率系数和效率都逐渐降低。
In order to improve the performance and practicability of the ultra-compact pump, the influence of the front cover on the hydraulic performance of the impeller is studied. Two types of subminiature pump impellers were designed based on the traditional method, one of which is closed type and the other of which is semi-open type. Experiments were carried out in the speed range of 3000 ~ 10000 r.m i-n 1, and the hydraulic performance of the ultra-small pump was measured. For semi-open impellers, adjust the axial clearance between the tip and the front pump cover between 0.2 and 0.8 mm to investigate its effect on the hydraulic performance of the pump. The experimental results show that the efficiency of two kinds of ultra-small pumps (closed impeller: 51%, semi-open impeller: 47%) are higher than the previous statistics of pump efficiency; due to the large proportion of external losses such as mechanical seals, pump efficiency With the Reynolds number decreases and the internal efficiency is close to a fixed value; with the axial clearance increases, the ultra-small pump lift coefficient, power coefficient and efficiency are gradually reduced.