Radial Piston Pump With Offset Bores for Lower Dead Volume
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Solution Overview
Problem
Radial piston pumps suffer from inefficiencies due to a significant 'dead volume' in the exhaust port, which reduces their compression efficiency, primarily caused by the axial arrangement of the outlet valves and the additional non-compressible volume created by the piston movement.
Innovation Solution
The longitudinal axis of the cylinder bore and the cover receiving bore are offset parallel, reducing the length of the outlet channel and minimizing the dead volume while maintaining a sufficient axial contact surface for secure assembly, allowing for simpler geometric elements and reliable sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the outlet valves are arranged axially in the high-pressure chamber, then installation space is reduced and design freedom is increased, but dead volume increases and compression efficiency decreases
Solution Approach 1:
The patent transitions the outlet valve arrangement from axial positioning to radial positioning relative to the drive shaft. This dimensional change allows the outlet channel to be shortened significantly while maintaining valve functionality, thereby reducing dead volume without compromising compression efficiency
Solution Approach 2:
The patent introduces asymmetric positioning of the cover receiving bore relative to the cylinder bore axis. The cover receiving bore is offset parallel to the cylinder bore axis, creating an asymmetric layout that optimizes the outlet channel path and minimizes dead volume while maintaining sufficient axial contact surface for assembly
2Manufacturing precision
If the cover is positioned with axial contact surface for precise positioning, then assembly precision is improved, but outlet channel length increases and dead volume increases
Solution Approach 1:
The cover receiving bore is positioned asymmetrically with its axis offset parallel to the cylinder bore axis. This asymmetric arrangement allows the cover to maintain precise axial positioning through contact surfaces while simultaneously shortening the outlet channel path and reducing dead volume
Solution Approach 2:
The patent resolves the contradiction by changing the spatial relationship between components. The offset parallel arrangement of the cover receiving bore axis relative to the cylinder bore axis creates an optimized geometric configuration that achieves both precise positioning and reduced dead volume
Data Source
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AI summary
Disclosed is a radial piston pump, in particular a radial piston pump, comprising a drive shaft (1) with an eccentric (11), and comprising at least one piston-working chamber combination (2), the piston-working chamber combination (2) comprising a cylinder bore (21) and a piston (22), the cylinder bore (21) having a fluid outlet channel (251), the cylinder bore (21) being closed by a cover (23), the cover (23) being accommodated in a cover receiving bore (27), the cylinder bore (21) having a longitudinal axis (211), and the cover receiving bore (27) having a longitudinal axis (271), the longitudinal axis (211) of the cylinder bore (21) and the longitudinal axis (271) of the cover receiving bore (27) being incongruent, in particular translationally shifted relative to one another. Also disclosed is a method for assembling a radial piston pump according to at least one of the preceding claims, characterized by the following method steps: - placing the intake valve (24) on the cover (23); - fastening the intake valve (24) to the cover (23) by means of at least one securing element (6), preferably by means of a grooved pin; - mounting the seal (26) on the cover (23); - placing the cover (23) by the valve side onto the shoulder (31) such that the at least one securing element (6) is located between the cover (23) and the shoulder (31); - fastening the cover (23) in the cover receiving bore (27).