Multi-Chamber Liquid Additive Pump for Freezing Adaptation
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Solution Overview
Problem
Existing devices for supplying liquid additives, such as urea-water solutions, face challenges in adapting delivery rates and pressures to varying operating conditions, particularly at low temperatures where freezing can cause volume expansion, damaging the equipment.
Innovation Solution
A device with multiple pump chambers arranged around a rotary drive shaft, allowing for adjustable delivery rates and pressures through parallel or series connections, and a separable coupling mechanism to optimize energy efficiency and prevent damage from freezing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single pump chamber is used to simplify the device structure, then the device complexity is reduced, but the adaptability of delivery rate and pressure to varying operating conditions deteriorates
Solution Approach 1:
The pump is divided into multiple independent pump chambers (first pump chamber and second pump chamber) that can operate independently or in combination. Each chamber can be selectively activated based on operating conditions, enabling flexible adaptation of delivery rate and pressure without requiring a completely different pump design for each condition.
2Reliability
If the pump operates continuously to maintain readiness, then the reliability of operation is improved, but the energy consumption increases, especially when not needed
Solution Approach 1:
The pump system dynamically adjusts its operation by selectively activating only the necessary number of pump chambers based on real-time operating conditions. The control unit enables the pump to transition between different operational states (single chamber, dual chamber, or standby), optimizing energy consumption while maintaining operational readiness when required.
3Reliability
If the device is evacuated or designed to compensate volume expansion to prevent freezing damage, then the reliability under low temperature conditions is improved, but the device complexity increases
Solution Approach 1:
The pump is divided into multiple independent pump chambers (first pump chamber and second pump chamber) that can operate independently or in combination. Each chamber can be selectively activated based on operating conditions, enabling flexible adaptation of delivery rate and pressure without requiring a completely different pump design for each condition.
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 device effectively adapts delivery rates and pressures to meet the demands of exhaust-gas treatment systems, ensuring reliable operation and preventing damage from freezing by varying the operation of pump chambers based on demand, thereby maintaining efficiency and preventing damage from freezing.
Implementation Method 1
a rotary drive, wherein the first pump chamber is arranged around a drive shaft of the rotary drive and, within the first pump chamber, there is formed at least one seal which can be displaced around the drive shaft by the rotary drive
Data Source
AI summary
A device for providing a liquid additive includes at least one first pump chamber (3) for conveying the liquid additive, and a rotary drive. The first pump chamber is arranged around a drive axis of the rotary drive. Inside the first pump chamber, at least one seal is formed, which can be displaced from the rotary drive around the drive axis. The device has at least one second pump chamber, which is arranged along the drive axis adjacent to the first pump chamber.