Internal Gear Pump Radial Thrust Balancing
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Solution Overview
Problem
Internal gear pumps experience radial thrust and friction due to pressure differences between the ring and pinion, leading to accelerated wear of the housing's internal wall.
Innovation Solution
The design incorporates symmetrical high-pressure and low-pressure recesses around the ring, which counteract the radial thrust by distributing fluid pressure evenly, reducing friction between the ring and the cylindrical wall through lubrication and balanced force components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure differences are used to reduce clearance between pinion teeth and ring teeth, then sealing performance is improved, but radial thrust increases causing friction and wear
Solution Approach 1:
The patent introduces counterbalancing pressure chambers that generate radial forces opposite to the thrust caused by pressure differences. These counter-chambers are positioned to create balancing forces that offset the radial thrust on the ring, reducing friction and wear on the housing wall while preserving the beneficial pressure differential for sealing.
Solution Approach 2:
The patent applies different pressure conditions to different regions of the ring. By creating localized high-pressure and low-pressure zones in specific angular positions, the design achieves both the necessary sealing pressure in contact regions and reduced radial thrust in other regions, allowing simultaneous optimization of sealing and force balance.
2Manufacturing precision
If the first pressure chamber is placed radially adjacent to the low-pressure space, then clearance is reduced, but radial thrust pushes the ring towards the housing wall
Solution Approach 1:
The patent introduces counterbalancing pressure chambers that generate radial forces opposite to the thrust caused by pressure differences. These counter-chambers are positioned to create balancing forces that offset the radial thrust on the ring, reducing friction and wear on the housing wall while preserving the beneficial pressure differential for sealing.
Solution Approach 2:
The patent extends the pressure management from a single radial dimension to multiple angular dimensions around the ring. By distributing pressure chambers at different angular positions and using symmetrical arrangements, the design balances radial forces while maintaining clearance control in critical regions.
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
This design effectively reduces friction and wear by balancing the radial forces and maintaining constant pressure on the cylindrical wall, enhancing the pump's operational efficiency and longevity.
Implementation Method 1
The liquid in the high-pressure space exerts a first internal radial thrust on the ring. The liquid in the low-pressure space exerts a second internal radial thrust on the ring, opposite the first radial thrust.
Implementation Method 2
A radial force is generated locally by each liquid element present in the recesses. By using recesses that are symmetrical to the second plane, the present disclosure allows the components of the forces generated by the liquid elements of the recesses that are parallel to the first plane to be cancelled out.
Implementation Method 3
reducing friction between the ring and the cylindrical wall through lubrication and balanced force components
Data Source
AI summary
An internal gear pump includes a pinion, a ring arranged around the pinion, and a cylindrical wall arranged around the ring. A support element, on which the pinion and the ring are supported, carries high-pressure liquid towards a recess located at the junction between the ring and the cylindrical wall, and also carries low-pressure liquid towards another recess located at another point of the junction between the ring and the cylindrical wall. The recess allows the load of the ring on the cylindrical wall to be reduced.