Parallel Return Passage Fluid Pump Design
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Solution Overview
Problem
Vane pumps experience flow disorders and increased flow loss due to the perpendicular merging of sucked and returned fluids, leading to reduced efficiency and potential cavitation at high speeds, particularly in two-stage fluid pumps.
Innovation Solution
A fluid pump design with a return passage that directs returned fluid in the same direction as the sucked fluid, using a control valve to merge them smoothly, and a two-stage pressurization process with trochoid type rotors to enhance efficiency and prevent cavitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the return passage merges returned fluid perpendicular to the suction passage, then the pump structure is simple, but flow disorders and cavitation occur at high speeds
Solution Approach 1:
Instead of merging the return passage perpendicular to the suction passage as in conventional designs, this patent inverts the approach by making the return passage parallel to the suction passage. This allows the returned fluid to flow in the same direction as the suction fluid, eliminating turbulent mixing and flow disorders while maintaining structural simplicity.
2Reliability
If the return passage is made parallel to the suction passage, then pump efficiency improves by preventing flow disorders, but the passage arrangement becomes more complex
Solution Approach 1:
The patent merges the return passage with the suction passage by making them parallel and aligned in the same flow direction. This integration allows both passages to work cooperatively, with the returned fluid reinforcing the suction flow rather than disrupting it, thereby improving efficiency without requiring separate complex routing.
3Productivity
If a return channel is provided to return discharged fluid, then discharge performance is improved, but flow loss increases due to perpendicular merging
Solution Approach 1:
The patent inverts the conventional perpendicular merging approach by making the return passage parallel to the suction passage. This allows the returned fluid to merge smoothly with the suction fluid in the same flow direction, eliminating turbulent mixing and reducing flow loss while maintaining improved discharge performance.
4Volume of moving object
If the pump is downsized for compactness, then installation space is reduced, but cavitation risk increases at high speed rotation
Solution Approach 1:
By inverting the conventional perpendicular merging design to a parallel arrangement, the patent enables better flow control in a compact configuration. The parallel passages allow returned fluid to reinforce rather than disrupt suction flow, preventing cavitation even in downsized pumps operating at high speeds.
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 improves pump efficiency by preventing flow disorders and cavitation at high speeds, allowing for downsizing and maintaining desired discharge performance in two-stage fluid pumps.
Implementation Method 1
a control valve which is arranged on a middle of the return passage and controls a flow of the returned fluid
Implementation Method 2
The return passage is formed so as to conduct the returned fluid in the same direction as a flow of a sucked fluid flowing through the suction passage to make the returned fluid flow together with the sucked fluid
Implementation Method 3
a pump unit which is contained in the housing and sucks in, pressurizes, and discharges the fluid with being rotationally driven by the rotary shaft
Data Source
AI summary
A fluid pump includes a housing, a rotary shaft, and pump units which are contained in the housing and sucks in, pressurizes, and discharges fluid with being rotationally driven by the rotary shaft. The housing has a suction passage conducting the fluid from a suction port to the pump unit, a discharge passage conducting the fluid from the pump unit to a discharge port, a return passage returning a portion of the fluid flowing through the discharge passage to an upstream side of the pump unit, and a control valve controlling a flow of the returned fluid. The return passage is formed so as to conduct the returned fluid in the same direction as a flow of a sucked fluid flowing through the suction passage to make the returned fluid flow together with the sucked fluid.