Analysis of Flow Characteristics of Asymmetric Cam-Rotor Double Stator Pump
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摘要: 针对传统液压泵的不足，研制了一种新型非对称式凸轮转子型双定子叶片泵. 该泵将凸轮转子型叶片泵的结构和双定子的思想相结合，在泵的壳体内设置了内外两个定子和一个转子，其中转子内外凸起数不同，使该泵可输出多级定流量，也能够同时对多个系统供油. 阐述了泵的工作原理与特点，通过非对称式凸轮转子型双定子叶片泵内部结构的分析，归纳出凸轮转子在不同转角下内外泵的理论流量，进而得到泵在不同工作方式下的瞬时流量. 搭建了非对称式凸轮转子型双定子叶片泵试验平台，试验结果表明：与传统的对称式双凸起凸轮转子型叶片泵相比，非对称式凸轮转子型叶片泵的流量脉动更小，大约降低了2%左右，试验结果与理论分析基本一致，验证了理论分析的正确性.Abstract: A new type of asymmetric cam-rotor double-stator vane pump was developed to deal with the shortcomings of traditional hydraulic pumps. Two inner and outer stators and one rotor are arranged in the casing of the vane pump, in which the numbers of protrusions inside and outside the rotor are different, so that the vane pump can output multi-stage constant flow, and simultaneously supply oil to multiple systems. The operation principle and characteristics of the vane pump are explained . Through the analysis on the internal structure of the vane pump, the theoretical flow of the inner and outer pumps of the cam rotor at different rotation angles is deduced, and then the instantaneous flow of the vane pump in different working modes is obtained. A test platform for the asymmetric cam-rotor double-stator vane pump was built. The test results show that the flow pulsation of the asymmetric cam-rotor vane pump is 2% less than that of the conventional symmetric vane pump with double convex cams. The test results are basically consistent with the theoretical analysis, which verifies the correctness of the theoretical analysis.
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Key words:
- asymmetric type /
- double-stator pump /
- cam rotor /
- flow pulsation /
- coefficient of inhomogeneity
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图 1 非对称式凸轮转子型双定子叶片泵结构
Figure 1. Structure of asymmetrical cam-rotor double-stator vane pump
图 2 非对称式凸轮转子型双定子叶片泵原理
Figure 2. Simplified schematic diagram of asymmetric cam-rotor double-stator vane pump
图 8 泵样机及实验系统
1—过滤器 2—温度计 3—截止阀 4—原动机 5.1、5.2、11—溢流阀 6—被试泵 7—单向阀 8.1、8.2—换向阀9.1、9.2、9.3—压力表 10—流量计
Figure 8. Pump prototype and experimental system
表 1 内泵单独工作时容积效率实验测量数据
Table 1. Test data of volumetric efficiency with single operation of internal pump
工作压力
/MPa额定转速
/（r•min−1）理论流量
/（L•min−1）实际流量
/（L•min−1）容积效
率/%1 1 440 31.56 29.63 93.88 2 1 440 31.56 29.28 92.79 3 1 440 31.56 28.87 91.47 4 1 440 31.56 28.27 89.56 5 1 440 31.56 27.29 86.48 6 1 440 31.56 26.55 84.11 
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表 3 内外泵联合工作时容积效率实验测量数据
Table 3. Test data of volumetric efficiency with joint operation of internal and external pumps
工作压力
/MPa额定转速
/（r•min−1）理论流量
/（L•min−1）实际流量
/（L•min−1）容积效
率/%1 1 440 112.99 106.25 94.11 2 1 440 112.99 104.93 92.87 3 1 440 112.99 103.45 91.56 4 1 440 112.99 101.67 89.98 5 1 440 112.99 98.99 87.61 6 1 440 112.99 96.58 85.48
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表 2 外泵单独工作时容积效率实验测量数据
Table 2. Test data of volumetric efficiency with single operation of external pump
工作压力/MPa 额定转速/（r•min−1） 理论流量/（L•min−1） 实际流量/（L•min−1） 容积效率/% 1 1 440 81.43 76.77 94.11 2 1 440 81.43 75.85 92.87 3 1 440 81.43 74.95 91.56 4 1 440 81.43 73.38 89.98 5 1 440 81.43 72.13 87.61 6 1 440 81.43 70.49 85.48
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