External Gear Pump Concave Trailing Flanks Cavitation Reduction
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Solution Overview
Problem
Existing external gear pumps face challenges in achieving a high pressure ratio between outlet and inlet pressures while minimizing cavitation and noise generation, which affects their efficiency and operational smoothness.
Innovation Solution
The external gear pump design features concave trailing tooth flanks on the first pump gear, creating fluid pockets that reduce cavitation and noise, with matching toothing parameters between gears, and adjustable superposition to enhance efficiency and reverse rotation capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the trailing tooth flanks are designed with concave sections forming fluid pockets, then cavitation tendency is reduced and noise is minimized, but the device complexity increases
Solution Approach 1:
The trailing tooth flanks are designed with concave sections that form fluid pockets, utilizing curved surfaces to trap and retain fluid. This curvature-based design prevents cavitation by maintaining fluid presence in the tooth flanks during operation, thereby reducing noise and harmful cavitation effects while managing the inherent geometric complexity.
2Object-generated harmful factors
If the trailing tooth flanks are designed with concave sections forming fluid pockets, then noise generation is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The concave sections in the trailing tooth flanks create fluid pockets that reduce noise generation during pump operation. The curved geometry design, while beneficial for noise reduction, necessitates higher manufacturing precision to ensure proper fluid pocket formation and maintainability, thereby linking noise control directly to manufacturing quality requirements.
3Stress or pressure
If the first pump gear is designed with concave trailing tooth flanks, then pressure ratio is increased, but the ease of manufacture decreases
Solution Approach 1:
The concave sections forming fluid pockets in the trailing tooth flanks of the first pump gear enable the achievement of higher pressure ratios. However, this curved geometry design complicates the manufacturing process compared to conventional straight or simple tooth flanks, thereby trading manufacturing ease for improved pressure performance.
Data Source
AI summary
An external gear pump, having a driving first pump gear and a second pump gear driven by the first pump gear, which intermesh to convey a fluid from a suction side to a pressure side of the external gear pump. The first pump gear and the second pump gear each have a plurality of teeth, each having a leading tooth flank leading in the rotation direction of the corresponding pump gear and a trailing tooth flank. The leading tooth flank of the first pump gear interacts with the trailing tooth flank of the second pump gear to drive the second pump gear via the first pump gear. The trailing tooth flanks of the first pump gear extend concavely to form a fluid pocket at at least one axial position in the radial direction at least in sections in each case.