Turbo Pump Reverse Flow Suppression via Segmented Partition Wall
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Solution Overview
Problem
Turbo type pumps experience inefficiencies in pressurizing and supplying fluids during excessive supply operations due to the generation of swirling reverse flows, which are not effectively reversed by existing rectifying means, leading to suboptimal performance.
Innovation Solution
Incorporating a reduced-diameter portion with a reverse surface and a reverse partition wall to restrict fluid flow in the circumferential direction, guiding the fluid back to the center of the passage and effectively reversing any reverse flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reverse surface is provided to abut against reverse-flowing fluid, then reverse flow can be suppressed, but the fluid diffuses in the circumferential direction after passing through rectifying means, reducing the efficiency of reverse flow reversal
Solution Approach 1:
The reverse surface is divided into multiple reverse surfaces arranged in the circumferential direction, with each reverse surface corresponding to a specific radial position. This segmentation allows different regions of the fluid flow to be addressed by appropriate reverse surfaces, preventing circumferential diffusion while effectively suppressing reverse flow.
Solution Approach 2:
Reverse surfaces are selectively provided at specific radial positions rather than uniformly across the entire circumference. The number and positioning of reverse surfaces are optimized according to the local flow characteristics at different radial positions, creating a locally adapted solution that prevents fluid diffusion while maintaining effective reverse flow suppression.
2Power
If the engine speed of the turbo type pump is increased, then fluid pressurizing capability is improved, but swirling reverse flow is generated when consumption flow rate is small
Solution Approach 1:
Reverse surfaces are provided upstream of the impeller to preemptively counteract reverse flow before it develops into harmful swirling patterns. By abutting the fluid against these reverse surfaces, the system prevents the formation of reverse flow vortices that would otherwise occur during excessive supply operation, allowing the impeller to operate at high speeds without generating harmful reverse flows.
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 pressurizing and supplying performance by efficiently reversing reverse flows, preventing issues like surging and cavitation, and ensuring stable operation during excessive supply conditions.
Implementation Method 1
a reverse partition wall portion provided in the reverse surface and configured to restrict a flow of the fluid in a circumferential direction
Implementation Method 2
a reduced-diameter portion having a reduced inner diameter in a state of forming a reverse surface facing a downstream side, the reduced-diameter portion being provided at a portion located on an upstream side of the impeller in the fluid passage
Data Source
AI summary
A turbo type pump configured to pressurize a fluid and supply the fluid to a downstream side of a fluid passage by rotation of an impeller provided in the fluid passage, includes: a reduced-diameter portion having a reduced inner diameter in a state of forming a reverse surface facing a downstream side, the reduced-diameter portion being provided at a portion located on an upstream side of the impeller in the fluid passage; and a reverse partition wall portion provided in the reverse surface and configured to restrict a flow of the fluid in a circumferential direction.