Pump 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, position-limiting protrusions, and extended parts on the piston sleeve and flanges to prevent radial movement, ensuring proper alignment and rotation of the piston sleeve.
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 work efficiency
Solution Approach 1:
The patent applies local quality by adding position-limiting protrusions at specific locations on the piston sleeve that engage with corresponding grooves in the cylinder. This localized constraint allows the piston sleeve to rotate smoothly while preventing eccentric rotation, thus maintaining ease of operation while improving work efficiency by eliminating friction caused by eccentric movement.
2Reliability
If position-limiting protrusions are added to the piston sleeve, then the reliability is improved by preventing eccentric rotation, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the position-limiting function into separate protrusions on the piston sleeve and corresponding grooves in the cylinder. This segmented approach allows each component to maintain its primary function while the added features work together to prevent eccentric rotation, improving reliability without significantly increasing overall device complexity.
Solution Approach 2:
Instead of adding complex constraints to limit the piston sleeve rotation, the patent uses the inverse approach by creating protrusions on the piston sleeve that fit into grooves in the cylinder. This inversion simplifies the constraint mechanism while effectively preventing eccentric rotation, thus improving reliability without excessive complexity.
3Productivity
If the piston sleeve is constrained to prevent radial movement, then the work efficiency is improved by reducing friction, but the ease of operation deteriorates due to restricted movement
Solution Approach 1:
The patent applies dynamics by designing the position-limiting protrusions and grooves to allow rotational movement while preventing radial displacement. The protrusions fit into the grooves in a way that permits the piston sleeve to rotate smoothly for operation while constraining it from moving radially, thus improving work efficiency by reducing friction without compromising the ease of rotational operation.
Data Source
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AI summary
Provided are a pump assembly, fluid machinery, and a heat exchange device. The pump assembly includes: a lower flange (12); a lower friction-reducing ring (60); a cylinder (20), the lower friction-reducing ring (60) being disposed inside the cylinder (20), and the lower flange (12) being disposed below the cylinder (20); and a piston assembly arranged inside the cylinder (20) and includes a piston sleeve (40) and a piston (50) slidably arranged inside the piston sleeve (40). The lower friction-reducing ring (60) has a central hole. A position-limiting protrusion (43) is disposed on a surface of the piston sleeve (40), which faces the lower flange (12). The limiting protrusion (43) extends into the central hole of the lower friction-reducing ring (60), fits and is limited by the lower flange (12), thereby preventing the piston sleeve (40) from moving in a radial direction relative to the lower flange (12). The present invention solves a problem in prior art that work efficiency of the pump body assembly is affected because the piston sleeve of the pump body assembly is prone to rotate eccentrically.