泵用微连通对称双卸荷槽及其困油与流量特性OA北大核心CSTPCD

In order to fully improve the oil trapping performance of external gear pump and perfect the existing setting theory of double relief grooves,an innovative structure of micro-connection and symmetry layout of relief grooves was proposed.Taking the no-connection and symmetry layout of conventional rectangular relief groove as an example,firstly,the embodiment method of innovative structure was given,secondly,the calculation model of oil trapping pressure and theoretical flow rate was established,and finally,the oil trapping pressure,displacement loss and flow pulsation under no-connection layout and micro-connection layout were comparatively analyzed.Example results show that the closer the meshing point is to the location of minimum oil trapping volume,the larger the relief area in the innovative structure is,which emphatically solves the problem of zero relief area at this point under no-connection layout;the innovative structure can fully alleviate the problem of oil trapped phenomenon in conventional structure and effectively avoid the harm caused by high-pressure impact and low-pressure cavitation;compared with the conventional structure,the theoretical displacement of the innovative structure decreases slightly,and the flow pulsation greatly increases,etc.The research results can provide reference for the optimization design of gear pumps.