Fluid Delivery Device with Segmented Pump Design
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Solution Overview
Problem
Existing fluid conveyor devices struggle to achieve high conveying performance with high efficiency, as they often face limitations in pump design, fluid flow coordination, and pressure management.
Innovation Solution
The fluid conveyor device incorporates a preliminary pump designed as an at least partially uncompensated inner gear pump with a higher border speed and larger pump volume than the main pump. The preliminary pump's suction chamber extends over a larger angle range than the main pump's, and its pressure chamber matches or exceeds the main pump's in size, ensuring optimal fluid supply and pressure management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the backing pump is designed as an uncompensated internal gear pump with higher limiting speed and larger pump volume, then the conveying capacity and efficiency are improved, but the structural complexity and manufacturing precision requirements increase
Solution Approach 1:
The pump system is divided into two distinct pumps with different compensation characteristics: the backing pump (uncompensated) and the main pump (compensated). This segmentation allows each pump to be optimized for its specific function, with the backing pump achieving higher speeds and the main pump maintaining pressure stability, thereby resolving the contradiction between productivity and complexity.
Solution Approach 2:
Different compensation characteristics are applied to different parts of the system: the backing pump uses an uncompensated design with larger pump volume and extended suction chamber for high-speed operation, while the main pump uses a compensated design for pressure stability. This local differentiation optimizes overall system performance without requiring complete redesign of all components.
2Quantity of substance
If the suction chamber of the backing pump extends over a larger angular range, then the fluid supply to the main pump is improved, but the manufacturing precision and assembly difficulty increase
Solution Approach 1:
The suction chamber of the backing pump is designed to extend over a larger angular range than the main pump's suction chamber, ensuring that fluid is pre-loaded and ready for transfer before the main pump needs it. This preliminary action guarantees continuous fluid supply without requiring extremely tight angular tolerances during operation.
Solution Approach 2:
The extended angular range of the backing pump's suction chamber ensures continuous fluid availability throughout the rotation cycle, maintaining uninterrupted supply to the main pump. This continuity reduces the stringency of manufacturing precision requirements compared to systems with synchronized, tightly-toleranced chamber timing.
3Ease of operation
If both pumps are driven by a common drive shaft, then the speed coordination is simplified, but the ability to independently optimize each pump's operating parameters is reduced
Solution Approach 1:
The common drive shaft serves multiple functions: it directly drives the backing pump and indirectly drives the main pump through the backing pump's output. This multi-functionality simplifies the drive system while still allowing the two pumps to operate at different effective speeds and parameters, resolving the contradiction between ease of operation and adaptability.
Solution Approach 2:
The backing pump acts as an intermediary between the common drive shaft and the main pump. It receives direct drive from the common shaft and transfers fluid to the main pump, which operates at a different speed. This intermediary arrangement allows both pumps to be connected to a single drive source while maintaining independent operational characteristics.
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 achieves high conveying performance with high efficiency by ensuring the main pump is optimally supplied with fluid, maintaining a steady speed relationship between the preliminary and main pumps, and achieving a high pressure ratio between the fluid input and output.
Implementation Method 1
The backing pump has two gears for conveying fluid, namely the backing pump pinion and the backing pump ring gear. The external teeth and the internal teeth mesh with each other in some areas.
Implementation Method 2
The backing pump pinion and the backing pump ring gear are intended for conveying fluid and are therefore designed in such a way that when the backing pump input shaft rotates they interact to convey the fluid
Data Source
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AI summary
The invention relates to a fluid delivery device (1) having a primary pump (2) and a main pump (3) fluidically connected to the primary pump (2), wherein the primary pump (2) can be driven by a primary pump input shaft (8), and the main pump (3) can be driven by a main pump input shaft (9), and the primary pump input shaft (8) and the main pump input shaft (9) are mechanically coupled to a common drive shaft (7) of the fluid delivery device (1). The invention is characterized in that the primary pump (2) is in the form of an non-compensated gear pump or a centrifugal pump and the main pump (3) is in the form of a compensated internal gear pump.