Pump Body Assembly Structure to Prevent Piston Sleeve Eccentric Rotation
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Solution Overview
Problem
The piston sleeve in pump body assemblies tends to rotate eccentrically, leading to friction issues between the piston sleeve, cylinder, and piston, which affects the work efficiency and performance of the pump body assembly.
Innovation Solution
The implementation of a pump body assembly design that includes a lower and upper friction-reducing ring, a cylinder, and a piston assembly with position-limiting protrusions and grooves to prevent radial movement of the piston sleeve, ensuring it rotates normally and reducing eccentric rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the piston sleeve is allowed to rotate freely inside the cylinder, then the ease of operation is improved, but the piston sleeve rotates eccentrically causing friction and reducing reliability
Solution Approach 1:
The patent introduces a position-limiting protrusion on the piston sleeve that engages with a position-limiting groove on the cylinder wall as an intermediary mechanism. This mediator constrains the piston sleeve's radial movement and prevents eccentric rotation, allowing the piston sleeve to rotate smoothly along the correct trajectory without direct complex constraint structures
Solution Approach 2:
The position-limiting function is segmented into discrete elements: a position-limiting protrusion on the piston sleeve and a corresponding position-limiting groove on the cylinder. This segmentation allows the constraint function to be implemented through simple geometric features rather than a complex continuous constraint mechanism, reducing friction while maintaining reliability
2Reliability
If position-limiting protrusions and grooves are added to prevent radial movement, then reliability is improved, but device complexity increases
Solution Approach 1:
The position-limiting protrusion and groove are implemented as localized geometric features on specific surfaces of the piston sleeve and cylinder, respectively. This local quality approach allows the constraint function to be integrated into existing components without adding separate complex mechanisms, maintaining simplicity while improving reliability
Solution Approach 2:
The position-limiting function is merged with the existing cylindrical structure by incorporating the protrusion and groove features directly into the piston sleeve and cylinder components. This merging eliminates the need for separate constraint devices, reducing overall device complexity while achieving the reliability improvement
3Ease of operation
If the piston sleeve rotates eccentrically, then ease of operation is maintained, but friction between piston sleeve, cylinder, and piston increases reducing productivity
Solution Approach 1:
The position-limiting protrusion and groove act as intermediaries that guide the piston sleeve's rotation path, preventing eccentric movement that would cause friction. This allows the piston sleeve to rotate freely along the correct trajectory without the harmful friction caused by eccentric rotation, maintaining ease of operation while improving productivity
Data Source
AI summary
A pump assembly, fluid machinery, and a heat exchange device. The pump assembly includes: a lower flange; a lower friction-reducing ring; a cylinder, the lower friction-reducing ring being disposed inside the cylinder, and the lower flange being disposed below the cylinder; and a piston assembly arranged inside the cylinder and includes a piston sleeve and a piston slidably arranged inside the piston sleeve. The lower friction-reducing ring has a central hole. A position-limiting protrusion is disposed on a surface of the piston sleeve, which faces the lower flange. The limiting protrusion extends into the central hole of the lower friction-reducing ring, fits and is limited by the lower flange.