排灌机械工程学报
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Journal of Drainage and Irrigation Machinery Engin  2012, Vol. 30 Issue (1): 35-39    DOI: 10.3969/j.issn.1674-8530.2012.01.008
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Calculation of gap between roller and valve plate for roller rotary oil pump
ZHANG Sheng-Chang, LIAN Jia-Di, DENG Hong-Ying, CHEN Xi-Dong, KE Yu-Long, ZHANG Yu-Lin
(Institute of Chemical Machinery Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China)
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Abstract To improve the efficiency of rod oil pumps,a new type of multistage,doubleaction roller rotary oil pump was put forward.In the pump rolling friction pairs are used to replace the conventional sliding friction ones and that cause a lower friction loss.A structure of multiple stages in series was adopted to raise discharge pressure greatly.Meantime a doubleaction structure in the inlet and outlet chamber was applied to get the radial force on the rotor balanced.Through analysis of forces applied on a roller in the pump,a force equilibrium equation was established.Based on the principle of minimum sliding friction,an optimal slot width was determined precisely by means of a computer code composed.By analyzing the rolling condition of a roller,the equilibrium equation of frictional moments on the roller surface was deduced,and considering the principal of optimal gap between two flat plates,eventually,a formula for determining the optimal gap between the roller and the valve plate was deduced.For a design example,such an optimal gap was calculated.As the gaps     were 0.044 399 mm and 0.055 975 mm,respectively,the forces applied on rollers will be relief and the leakage will be reduced,subsequently the pump overall efficiency will be improved.The method proposed in the article comes up with a theoretical trial for determining,optimizing and choosing the gap to the pump.
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Articles by authors
ZHANG Sheng-Chang
LIAN Jia-Di
DENG Hong-Ying
CHEN Xi-Dong
KE Yu-Long
ZHANG Yu-Lin
Key wordsroller rotary pump   valve plate   rotor slot   friction moment   gap     
Received: 2011-09-02; Published: 2012-01-30
Cite this article:   
ZHANG Sheng-Chang,LIAN Jia-Di,DENG Hong-Ying et al. Calculation of gap between roller and valve plate for roller rotary oil pump[J]. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(1): 35-39.
 
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