Gear Pump Delivery Conduit Stress Reduction
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Solution Overview
Problem
Gear pumps face reliability issues and premature breakages due to high tensions at zones with small degrees of curvature near the delivery conduit, leading to potential cracking and reduced working life.
Innovation Solution
The design incorporates a C-shaped delivery conduit with an inlet mouth positioned at a distance from the intersection with the housing seating, featuring a shim for reduced wear and improved surface finishing, and a monolithic body with machined surfaces to minimize stress concentrations and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the delivery conduit mouth involves an extended zone of the lateral wall and base for easy moulding, then manufacturing ease is improved, but tension concentrations and breakage risk increase
Solution Approach 1:
The invention introduces a distinct, separable component (the specially shaped mouth piece) that is integrated into the moulding process. This segmentation allows the mouth zone to be designed for manufacturing ease while being structurally differentiated from the critical curvature zones, thus preventing tension concentrations in the main body while maintaining easy geometries for realisation by moulding.
Solution Approach 2:
The invention applies local quality by creating a specific geometric configuration for the mouth zone that differs from the rest of the housing seating. The mouth involves an extended zone specifically designed with appropriate curvature radii and thickness distribution, providing both ease of manufacture and structural integrity locally, while critical zones maintain different characteristics for reliability.
2Volume of moving object
If zones with small degrees of curvature are used near the delivery conduit, then compact design is achieved, but tension concentrations and cracking risk increase
Solution Approach 1:
The invention carefully manages curvature radii in different zones. Critical zones are designed with larger curvature radii to avoid tension concentrations and cracking, while the mouth zone and non-critical areas can maintain smaller curvatures for compact design. This selective application of curvature principles allows the pump to achieve compact dimensions without compromising structural strength in vulnerable areas.
3Ease of manufacture
If the delivery conduit mouth is extended to involve more housing seating zone, then ease of manufacture is improved, but wear and reliability deteriorate
Solution Approach 1:
The invention segments the housing seating into distinct functional zones: the mouth zone extended for manufacturing ease, and critical zones with enhanced protection. By introducing a shim in the critical zones and designing the mouth as a separate extended structure, the solution allows manufacturing simplicity in the mouth area while protecting wear-prone areas, thereby extending the pump's working life.
Solution Approach 2:
The invention applies beforehand cushioning by introducing a shim in advance in the critical zones of the housing seating. This shim serves as a protective layer that compensates for wear before it occurs, allowing the delivery conduit mouth to be extended for manufacturing ease without compromising the durability and working life of the pump in the critical bearing zones.
Data Source
AI summary
A gear pump comprising:—a pair of gears (2) able to interact with a fluid crossing the pump (1);—a housing seating (3) of said pair of gears (2), said housing seating (3) comprising a rest plane (30) of a shim (4);—a delivery conduit (6) which develops from said housing seating (3) and comprising an inlet mouth (60). The inlet mouth (60) of the delivery conduit (6) is at a distance from an intersection (7) between a rest plane (30) of the shim (4) and remaining parts of the housing seating (3).