Pump Body Assembly Piston Sleeve Eccentric Rotation Prevention

The patent introduces position-limiting protrusions on the piston sleeve that engage with position-limiting grooves on the cylinder wall. These intermediary features act as mediators between the piston sleeve and cylinder, preventing eccentric rotation while maintaining the overall simplicity of the structure. The protrusions and grooves work together as a coordinated system to guide and constrain the piston sleeve's motion.

The position-limiting grooves are pre-formed on the cylinder wall before the piston sleeve is installed. This preliminary action ensures that when the piston sleeve is assembled, the pre-positioned protrusions and grooves automatically engage to prevent eccentric rotation from the outset, eliminating the need for additional adjustment or complex alignment mechanisms during operation.

The position-limiting function is segmented into two separate components: protrusions on the piston sleeve and corresponding grooves on the cylinder. This segmentation allows each component to be manufactured independently with standard machining processes, and the two parts work together to provide the position-limiting function. The segmentation reduces the complexity of any single component while achieving the overall reliability goal.

The position-limiting protrusions and grooves are localized features positioned at specific locations on the piston sleeve and cylinder. Rather than requiring complex mechanisms throughout the entire assembly, the solution applies local quality by concentrating the position-limiting function at specific points where the protrusions and grooves engage, maintaining simplicity elsewhere in the structure.