Research On The New Round Piston Positive-Displacement Pump

Piston positive-displacement pump finish working depended on the element advance and return movement or rotate in the cylinder, made the working capacity alternate change between enlarge narrowing, to realize the air or liquid inhale or discharge. The working element with advance and return movement is called reciprocating pump, the working element with rotate is called rotary pump. Piston positive-displacement pump can use for refrigerating compressor, air compressor, vacuum pump, fluid compressor and so on. But reciprocating compressor is the earliest to be used for refrigeration system.Now, the two types of widespread positive-displacement pumps have each disadvantage, reciprocating piston type is derived through crank connecting link, made the construction complex and volume bigger and speed of rotation lower. Rolling movement piston type has simple construction, little volume and high speed of rotation, but low capacity utilization ratio.The new round piston positive-displacement pump is new type of piston positive-displacement pump without crank connecting link. It has the excellence both reciprocating piston type and rolling movement piston type, resolves the problems with reciprocating piston pump's construction complex, low speed of rotation and rolling movement piston pump's low capacity utilization ratio, It also has the piston with rotary movement freedom, resolves the problems with bigger friction and abrasion.This thesis puts the new round piston positive-displacement pump to use refrigerating compressor as an example, uses Solid Works design the new pump's construction, uses Visual Basic account the advantage with kinematics, thermodynamics, dynamics compared with traditional crank connecting link piston compressor. Analyses the characteristic about reducing the friction, abrasion, leak and so on. The result indicates the new pump has little friction and abrasion, simple construction, convenient driving, high capacity utilization ratio, and has widespread application foreground.