Plastic Gear Rotor Pump for Corrosive Fluid Handling
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Solution Overview
Problem
Existing fluid pumps, particularly those used in automotive and diesel engine applications, face challenges in efficiently pumping additives like SCR reactants due to material compatibility and durability issues, especially when dealing with corrosive fluids and the need for precise gear rotor alignment.
Innovation Solution
A positive displacement fluid pump design featuring a motor-driven inner and outer gear rotor system, where at least one of the rotors is made from plastic, and a guide pin mechanism for accurate alignment, along with a magnetic coupling for separation from the motor, enabling efficient pumping of liquids like SCR reactants while maintaining durability and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal gear rotors are used, then durability and strength are improved, but corrosion resistance deteriorates when pumping corrosive fluids like SCR reactants
Solution Approach 1:
The patent employs composite material construction for the gear rotors, combining metal components with corrosion-resistant coatings or plastic components with reinforcement. This allows the gear rotors to achieve both high strength for durability and corrosion resistance for pumping SCR reactants, resolving the contradiction between strength and corrosion resistance.
2Object-affected harmful factors
If plastic gear rotors are used, then corrosion resistance is improved, but strength and durability deteriorate
Solution Approach 1:
The patent uses composite plastic materials for the gear rotors, incorporating glass fibers, carbon fibers, or other reinforcement materials within the plastic matrix. This composite construction provides both the corrosion resistance needed for SCR reactant pumping and sufficient strength for durable operation.
3Ease of manufacture
If traditional alignment methods are used, then manufacturing simplicity is maintained, but gear rotor alignment precision deteriorates
Solution Approach 1:
The patent incorporates pre-formed alignment features directly into the gear rotor components themselves, such as precision-machined bore features or integrated locating elements. These preliminary alignment features ensure precise gear rotor alignment during assembly without requiring complex external alignment procedures or specialized tooling, thus maintaining manufacturing simplicity while achieving high alignment precision.
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 design ensures efficient pumping of liquids, maintains durability and corrosion resistance, and allows for precise alignment of gear rotors, addressing material compatibility and durability issues in existing pumps, particularly with corrosive fluids like SCR reactants.
Implementation Method 1
A fluid pump includes a motor, an inner gear rotor and an outer gear rotor. The inner gear rotor is driven for rotation about an axis by the motor
Implementation Method 2
along with a magnetic coupling for separation from the motor
Data Source
AI summary
A fluid pump includes a motor, an inner gear rotor and an outer gear rotor. The inner gear rotor is driven for rotation about an axis by the motor and has a plurality of outwardly extending teeth. The outer gear rotor has a plurality of inwardly extending teeth that are engaged by the teeth of the inner gear rotor so that the outer gear rotor is driven for rotation about a second axis when the inner gear rotor rotates. At least one of the inner gear rotor and the outer gear rotor is formed from a plastic material.