Compressor Pump Eccentric Shaft Rolling Bearing Friction Reduction
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Solution Overview
Problem
The existing compressor pump structures with rotating-cylinder piston compressors have complex piston and cylinder piston hole structures, leading to high processing costs and significant frictional power loss due to large sliding friction pairs and deformation under unit force.
Innovation Solution
A compressor pump structure with a rotating shaft having an eccentric central axis, a piston with sliding and contacting planes for sealing contact with flanges, and a rolling assembly between the cylinder and cylinder sleeve to reduce friction and structural complexity, featuring volume-variable chambers and a regular piston structure for reduced processing difficulty.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sliding friction pair between cylinder and cylinder sleeve is used, then the piston can be supported, but the frictional power loss is large due to large sliding area and linear velocity
Solution Approach 1:
The patent replaces the sliding friction pair between cylinder and cylinder sleeve with a rolling bearing system. The rolling bearing converts sliding friction into rolling friction, significantly reducing frictional power loss while maintaining the piston support function. This substitution of mechanical system directly addresses the contradiction by eliminating the harmful sliding friction.
2Ease of operation
If the cylinder is radially spaced to accommodate the piston, then the piston can move freely, but the span of the rotating shaft supporting portion is large causing large deformation and contact stress
Solution Approach 1:
The patent segments the supporting structure by introducing intermediate support elements (such as guide pins or auxiliary bearings) between the rotating shaft and the cylinder sleeve. This segmentation divides the large span into smaller segments, reducing the bending moment and contact stress on the rotating shaft while still allowing free piston movement.
3Stability of the object's composition
If the piston has a non-circular structure with arc surfaces and parallel surfaces, then the piston can be prevented from self-rotation, but the structure becomes complex and processing cost increases
Solution Approach 1:
The patent employs asymmetric design in a simplified form by using a single arc surface combined with a flat surface on the piston, rather than the traditional two arc surfaces and two parallel surfaces. This asymmetric configuration is sufficient to prevent self-rotation while significantly reducing structural complexity and processing difficulty.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution simplifies the piston and cylinder piston hole structure, reduces processing costs, decreases frictional losses, and enhances the energy efficiency and reliability of the compressor by stabilizing piston movement and reducing vibration, while maintaining regular volume variations.
Implementation Method 1
the rolling assembly being arranged between the cylinder and the cylinder sleeve and forming rolling contact with the cylinder and the cylinder sleeve respectively
Implementation Method 2
the rotating shaft being slidably arranged in the piston
Implementation Method 3
the first contacting plane on the upper side being in sealing contact with the upper flange, and the first contacting plane on the lower side being in sealing contact with the lower flange
Data Source
AI summary
A compressor pump structure comprises a rotating shaft, a piston, a cylinder, a cylinder sleeve, a lower flange and an upper flange, the central axis of the rotating shaft being arranged eccentrically with respect to the central axis of the cylinder, the rotating shaft being slidably arranged in the piston, the piston being movably arranged in the cylinder and forming two volume-variable chambers with the cylinder, the piston comprising two first sliding planes arranged opposite one another and two first contacting planes arranged opposite one another, the first contacting plane on the upper side being in sealing contact with the upper flange, and the first contacting plane on the lower side being in sealing contact with the lower flange. Also disclosed is a compressor with the compressor pump structure.