Variable Displacement Pump Piston Pressure Regulation
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Solution Overview
Problem
Conventional variable displacement gear pumps lack effective mechanisms to regulate fluid output pressure, leading to potential damage from excessive pressure and requiring additional safety measures like pressure regulators and valves, which increase costs.
Innovation Solution
A pump design featuring a piston with first and second passageways within a relief chamber, where the second passageway is closer to the piston face and has a greater cross-sectional area, allowing fluid to flow between the suction and discharge chambers at different pressures, enabling pressure regulation and reducing the need for external safety valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional variable displacement gear pumps are used without additional pressure regulation mechanisms, then the pump structure remains simple, but the output pressure cannot be effectively regulated leading to potential damage from excessive pressure
Solution Approach 1:
The pressure regulation function is merged into the pump body by integrating a piston with first and second passageways directly into the pump structure. This eliminates the need for separate external pressure regulators and safety valves, achieving effective pressure regulation while maintaining relatively simple pump structure.
Solution Approach 2:
The piston component performs multiple functions: it serves as both a displacement control element and a pressure regulation mechanism. The first passageway allows fluid flow at lower pressures for normal operation, while the second passageway provides an alternative flow path at higher pressures to prevent excessive pressure buildup, making the pump self-regulating.
2Reliability
If additional safety valves and pressure regulators are added to conventional pumps, then pressure regulation capability is improved, but device complexity and cost increase
Solution Approach 1:
The safety valve and pressure regulator functions are combined into a single integrated piston assembly with two passageways. This eliminates the need for multiple separate safety components, reducing device complexity and component count while maintaining comprehensive pressure safety through the dual-passageway design.
3Productivity
If a single passageway is used in the piston, then the structure remains simple, but the pump cannot optimize fluid flow at different pressure levels
Solution Approach 1:
The single passageway is segmented into two distinct passageways (first and second passageways) within the piston. Each passageway is optimized for different pressure ranges, allowing the pump to efficiently regulate fluid flow at both low and high pressure levels. This segmentation enables pressure-dependent flow optimization without requiring complex external control systems.
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 regulates fluid output pressure, reducing the risk of damage to the pump and downstream components, eliminates the need for additional safety measures, and optimizes fluid flow according to pressure requirements, enhancing operational safety and efficiency.
Implementation Method 1
The piston is movable within the relief chamber according to a pressure in the relief chamber. The first and second passageways form fluid paths between the suction chamber and the discharge chamber at a first and second pressure in the relief chamber, respectively, the first pressure being less than the second pressure.
Data Source
AI summary
A pump for an engine includes a suction chamber, a discharge chamber, and a piston at least partly received within a relief chamber. The piston has first and second passageways provided therein. The second passageway is located closer to a face of the piston than the first passageway. The piston is movable within the relief chamber, so that the volume of the fluid transfer from the suction chamber to the discharge chamber is varied according to a pressure in the relief chamber. The first and second passageways form fluid paths between the suction chamber and the discharge chamber at a first and second pressure in the relief chamber, respectively, the first pressure being less than the second pressure.