Research of impact characteristics of new liquid resistance pump valves
In order to reduce the impact stress between the valve core and valve seat,and reduce impact wear between them,a new type of pump valve with a liquid resistance structure was introduced.The structural parameters of the pump valve were optimized using numerical simulation methods,and the impact velocity between the valve core and valve seat,as well as the pressure contact situation of the pump valve collision impact,were simulated and calculated.The motion characteristics and impact stress results of the liquid resistance pump valve and the existing pump valve were compared and analyzed,and a test bench was built to verify the simulation model results.The results show that during the falling stage of the valve core,the return speed of the pump valve with a liquid resistance structure is significantly lower than that of traditional pump valves.The speed of contact between the valve core and valve seat of traditional pump valves has reached 0.118 m/s,while the speed of contact between the valve core and valve seat of pump valves with liquid resistance structure is only about 1/6 of that of traditional pump valves,which is about 0.02 m/s.The pump valve with a liquid resistance structure only experiences one collision,while the traditional pump valve experiences two collisions.During the collision,the maximum contact stress between the valve core and valve seat of the pump valve with a liquid resistance structure is about 260 MPa,while the maximum contact stress of traditional pump valves in the first collision is 190 MPa,and that in the second collision is 270 MPa.The pump valve with a liquid resistance structure can significantly reduce the speed of contact between the valve core and valve seat,reduce impact stress,thus reducing the impact wear of the pump valve.The research results can provide reference for the design and application of liquid resistance pump valves.
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