Bidirectional Peripheral Channel Pump with Counter-Rotating Impellers
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Solution Overview
Problem
Positive-displacement pumps used in SCR systems for fuel additives are complex and costly due to their ability to convey in both directions, which is not efficiently addressed by existing technologies.
Innovation Solution
A cost-effective solution is achieved by using two peripheral or lateral channel pump stages in series, with impellers arranged counter to each other's conveying direction, allowing bidirectional operation with a simpler structure, and enhancing adjustability through V-shaped blade arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If positive-displacement pumps are used to enable bidirectional conveying, then the pump can convey in both forward and backward directions, but the construction becomes more complex and cost-intensive
Solution Approach 1:
The pump is divided into two separate pump stages, each optimized for one conveying direction. The first pump stage handles forward conveying while the second pump stage handles backward conveying, allowing each stage to use simpler peripheral channel construction rather than requiring a complex bidirectional positive-displacement mechanism
Solution Approach 2:
A single pump housing and motor assembly serves multiple functions by incorporating two different pump stages that can operate sequentially in different directions, replacing what would traditionally require two separate pumps or a complex bidirectional positive-displacement pump
2Ease of manufacture
If peripheral channel stages are used instead of positive-displacement pumps, then the structure becomes more cost-effective, but the ability to convey in both directions is limited
Solution Approach 1:
The pump system is segmented into two separate peripheral channel pump stages arranged in series, each optimized for one direction of flow. This segmentation allows the use of simpler, more cost-effective peripheral channel construction while achieving bidirectional capability through the combination of stages
Solution Approach 2:
Instead of trying to make a single pump stage work in both directions (which would require complex positive-displacement mechanisms), the invention inverts the approach by using two unidirectional peripheral channel stages that together achieve bidirectional operation, with each stage operating in its optimal direction
3Device complexity
If two impellers are arranged counter to each other's conveying direction, then bidirectional conveying is enabled with simple structure, but the conveying capacity may be reduced
Solution Approach 1:
Each impeller is designed with locally optimized blade geometry and angle suited to its specific conveying direction and flow requirements. The first impeller has characteristics optimized for forward conveying while the second impeller has characteristics optimized for backward conveying, allowing each to operate at high efficiency in its designated direction
Solution Approach 2:
The blade angles, pitch, and geometric parameters of the two impellers are differently optimized to match their respective conveying directions and flow rates. This parameter differentiation allows each impeller to maintain high conveying capacity in its optimal direction while the overall system achieves bidirectional capability
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 configuration enables efficient bidirectional conveying with reduced complexity and cost, maintaining high efficiency even at low conveying quantities, making it suitable for SCR pumps in motor vehicles.
Implementation Method 1
Both pump stages are constructed as peripheral and/or lateral channel stages and the impellers of the two pump stages are arranged counter to the conveying direction of the other pump stage
Data Source
AI summary
A pump with a housing, in which an electric motor of a pump step which can be driven by a shaft of the electric motor is arranged. A second pump step which can be driven by the shaft is arranged in series with the first pump step, both pump steps being designed as peripheral or lateral channel steps and the running wheels of both pump steps are arranged counter to the direction of conveyance of other pump step.