李小平, 冀 宏, 张继铭, 王金林, 李瑞锋, 魏文彬. 气隙非浸油式电机叶片泵的主泵吸油配流设计[J]. 农业工程学报, 2016, 32(10): 54-59. DOI: 10.11975/j.issn.1002-6819.2016.10.008
    引用本文: 李小平, 冀 宏, 张继铭, 王金林, 李瑞锋, 魏文彬. 气隙非浸油式电机叶片泵的主泵吸油配流设计[J]. 农业工程学报, 2016, 32(10): 54-59. DOI: 10.11975/j.issn.1002-6819.2016.10.008
    Li Xiaoping, Ji Hong, Zhang Jiming, Wang Jinlin, Li Ruifeng, Wei Wenbin. Design of suction flow distributor of main pump in non-oil-immersed air gap type hydraulic electro-motor pump[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2016, 32(10): 54-59. DOI: 10.11975/j.issn.1002-6819.2016.10.008
    Citation: Li Xiaoping, Ji Hong, Zhang Jiming, Wang Jinlin, Li Ruifeng, Wei Wenbin. Design of suction flow distributor of main pump in non-oil-immersed air gap type hydraulic electro-motor pump[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2016, 32(10): 54-59. DOI: 10.11975/j.issn.1002-6819.2016.10.008

    气隙非浸油式电机叶片泵的主泵吸油配流设计

    Design of suction flow distributor of main pump in non-oil-immersed air gap type hydraulic electro-motor pump

    • 摘要: 为保证气隙非浸油式电机叶片泵中主泵在高转速下吸油充足,针对孔板离心泵输出液流在主泵配流窗孔外侧与内侧压差大、旋转液流向主泵配流时流动阻力大的问题,提出了在主泵配流窗孔增设平衡槽和导流槽的结构。流场计算表明:平衡槽将外侧的引油窗孔与内侧的辅助窗孔沟通,控制两窗孔出口的压力差为一较小的定值;导流槽避免了旋转液流在引油窗孔中产生旋涡及其流动阻力,显著地增大了引油窗孔的入口流量,窗孔出口的静压随导流槽包角增大而增大,当导流槽包角大于80°时,引油窗孔出口静压提升了10%,辅助窗孔出口静压相应提升了15.4%。该研究为电机泵的主泵配流设计提供了参考。

       

      Abstract: The suction performance of hydraulic pumps is one of the important factors restricting pumps’ integration and work with high rotating speed. A port-plate centrifugal pump was designed to play a role of charging pumps to boost the inlet pressure of main pump in a non-oil-immersed air gap type hydraulic motor vane pump, which could guarantee the sufficient suction of main pump working at a higher speed. Two problems were incurred when the delivery flow of port-plate centrifugal pump flowed through the suction flow distributor of main pump. The delivery flow of centrifugal pump developed high pressure difference between the outside and inside of flow distribution channel of main pump, and this high pressure difference gave more chances to the separation between vanes and stator of vane pump(main pump). Vortices were formed when the rotary flow flowed through the flow distribution channel of main pump, which made the flow resistance increase and made the fluid flow into the main pump uneasily. And the harm of 2 problems became increasingly serious with the increase of rotating speed. Aiming at solving the problems, an improvement structure that introduced balance slots and guide slots into the suction flow distributor of main pump was proposed. Computational Fluid Dynamics(CFD) software Fluent was used to simulate the flow field distribution and verify the improvement effect of this structure. The results of flow field calculation showed that the balance slot provided a route for the fluid flow from the outside discharge channel to the inside assistive channel and communicated the pressure of them. The pressure of discharge channel was slightly decreased, while that of assistive channel had a sharp increase because of the balance function of balance slot. So the outlet pressure difference of them was kept at a low value. The formation of vortex was avoided when the rotary flow flowed through the discharge channel because of the direction function of guide slot. So the flow resistance of discharge channel was decreased, the inlet flow of discharge channel had an obvious increase, the static pressure of fluid in the discharge channel gradually increased in the flow direction, and the outlet static pressure of discharge channel and assistive channel increased markedly. With the guide slot wrap angle rising, the inlet flow of discharge channel had the upward trend(less than 80°) at first, and then a trend of nearly flatting. The outlet static pressure of discharge channel and assistive channel had the same rule with the inlet flow of discharge channel when the guide slot wrap angle changed; when guide slot wrap angle was larger than 80°, the outlet static pressure of discharge channel increased by 10% and that of assistive channel increased by 15.4%. In addition, the balance slot approximately kept the outlet pressure difference between discharge channel and assistive channel at a low constant value with the change of guide slot wrap angle. A better suction performance is obtained by the main pump because of the improved design of the suction flow distributor that reduces the pressure difference between discharge channel and assistive channel and increases the inlet pressure of main pump, which guarantees the reliability and high efficiency of main pump working at the higher speed. This research can serve as references of flow distribution design of main pump in the hydraulic electro-motor pump.

       

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