Vane Pump Return Passage Design for Suction Efficiency
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Solution Overview
Problem
The existing vane pump design suffers from deteriorated suction properties due to excessive oil flowing into the main suction port, which inhibits the flow of working oil and reduces the pump's efficiency.
Innovation Solution
A vane pump design that includes a return passage with an axial direction passage and a turning passage to reverse excessive fluid flow towards the second suction port, aligning it with the working fluid flow, thereby preventing interference with the working oil suction and enhancing suction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If excessive oil is recycled through the return oil passage to the main suction port, then the excessive oil is effectively reused, but the suction property of the vane pump deteriorates due to flow inhibition
Solution Approach 1:
The suction ports are divided into a main suction port and a sub-suction port, allowing separate control of working oil and excessive oil flows. The main suction port receives working oil from the inlet through the outer circumference oil passage, while the sub-suction port receives excessive oil from the return oil passage, preventing flow interference and maintaining suction performance while enabling effective recycling.
2Ease of repair
If excessive oil flows into the main suction port through the return oil passage, then recycling is achieved, but the flow of working oil from the inlet is inhibited
Solution Approach 1:
The harmful effect of excessive oil interfering with working oil flow is eliminated by extracting excessive oil from the main suction path and directing it separately through the sub-suction port. This separation removes the harmful flow inhibition while preserving the beneficial recycling function.
3Device complexity
If the return oil passage directs excessive oil to the main suction port, then the recycling configuration is simplified, but the suction amount decreases
Solution Approach 1:
The suction system is segmented into main and sub pathways, with the sub-suction port specifically dedicated to excessive oil intake. This segmentation maintains a relatively simple return oil passage configuration while preventing flow interference, thereby preserving suction amount and avoiding the productivity deterioration that would result from a simplified single-path design.
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 improves the suction property of the vane pump by effectively guiding excessive oil into the suction path, reducing pressure loss and increasing the suction amount, thus enhancing the pump's overall performance.
Implementation Method 1
a turning passage configured to reverse the excessive fluid towards the second suction port, the excessive fluid being guided through the axial direction passage
Data Source
AI summary
A vane pump includes: pump chambers formed by a rotor, a cam ring, and vanes; a first suction port that guides working fluid guided by a suction passage to the pump chambers; a second suction port that guides the working fluid guided from the suction passage through a communication passage to the pump chambers; and a return passage to which excessive fluid of the working fluid discharged from the pump chambers is guided. The return passage has: a body-internal passage through which the excessive fluid flows along an axis direction at an outer side of the cam ring in a radial direction; and a turning passage that reverses the excessive fluid guided through the body-internal passage towards the second suction port.