Vane Pump Liner Pre-Pressurization Opening Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vane pumps experience reduced efficiency due to cross-flow between suction and discharge pressure chambers caused by the pre-pressurization opening communicating with the suction pressure chamber before the upstream vane contacts the cam surface downstream of the suction opening.
Innovation Solution
A vane liner design with a pre-pressurization opening positioned at least 90 degrees upstream of the downstream end of the suction opening and spaced from the upstream end of the discharge opening, preventing cross-flow by ensuring the vane is sealed on the downstream end of the suction opening before opening the pre-pressurization opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the pre-pressurization opening communicates with the pump chamber before the upstream vane contacts the cam surface downstream of the suction opening, then pre-pressurization is achieved, but cross-flow between suction and discharge pressure chambers occurs reducing pumping efficiency
Solution Approach 1:
The pre-pressurization opening is positioned to open before the vane contacts the downstream cam surface, allowing pressurized fluid to be introduced into the pump chamber in advance. This preliminary action prepares the fluid for compression while the spatial arrangement prevents harmful cross-flow
Solution Approach 2:
The pre-pressurization opening is located at a specific circumferential position (at least 90 degrees upstream from the downstream end of the suction opening) to create localized pressurization in the discharge chamber without affecting the suction chamber, thereby achieving selective pre-pressurization without cross-flow
2Productivity
If the pre-pressurization opening is positioned to prevent cross-flow, then pumping efficiency is maintained, but the timing and positioning requirements become more complex
Solution Approach 1:
The solution specifies a quantitative parameter (at least 90 degrees circumferential spacing) for the pre-pressurization opening position relative to the suction opening. This parameter-based approach simplifies design by providing a clear geometric criterion that ensures non-interference between suction and discharge chambers while maintaining pre-pressurization functionality
Data Source
AI summary
A vane liner for use in a vane pump has a vane liner body defining an inner bore for providing a cam surface in a vane pump. The cam surface has a suction opening formed through the body at one circumferential extent, and a discharge opening through the body at a distinct circumferential extent. A pre-pressurization opening extends through the body at a location upstream of an upstream end of the discharge opening, but spaced by at least 90 degrees from a downstream end of the suction opening. A vane pump incorporating the above-discussed liner is also claimed. Further, a vane pump is also disclosed and claimed having the spacing from the downstream end of the suction opening at least X degrees wherein X equals 360 divided by N, N being the number of vanes in the vane pump.