Centrifugal Blower Gap Passage Layout for Lower Pressure Loss
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Solution Overview
Problem
Conventional one-sided suction type centrifugal blowers experience inefficiencies due to airflow stagnation and pressure loss in the gap passage between the upper end portion and the suction port forming portion, leading to reduced air suction efficiency.
Innovation Solution
The blower design includes a tubular portion and an upper end portion that guides air into the gap passage, with the distance between the upper end portion and the suction port forming portion decreasing downstream, minimizing stagnant regions and enhancing airflow guidance towards the suction port.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the gap passage is designed with a constant distance between the upper end portion and suction port forming portion, then the structure is simple, but airflow stagnation occurs and pressure loss increases
Solution Approach 1:
The patent applies the dynamics principle by making the gap passage distance variable rather than constant. The distance between the upper end portion and suction port forming portion decreases in the downstream direction, creating a dynamic geometry that adapts to airflow patterns. This variable distance design prevents airflow stagnation and reduces pressure loss while maintaining reasonable structural complexity.
2Productivity
If the gap passage distance is reduced downstream, then airflow efficiency improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by implementing different gap distances at different locations along the gap passage. The distance is larger at the upstream end and gradually decreases toward the downstream end. This localized variation optimizes airflow at each section - providing adequate space for flow development upstream while enhancing suction efficiency downstream - without requiring extreme manufacturing precision throughout the entire structure.
3Ease of operation
If the upper end portion overlaps with both suction port and suction port forming portion, then airflow guidance is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the upper end portion to serve multiple functions simultaneously. It acts as both a structural component defining the gap passage and an airflow guidance element that overlaps with both the suction port and suction port forming portion. This multi-functional design improves airflow guidance without requiring additional separate components, thereby limiting the increase in device complexity.
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 air suction efficiency by reducing pressure loss and minimizing useless airflow regions, allowing for more efficient simultaneous suction of internal and external air.
Implementation Method 1
The fan is configured to suck air in an axial direction of the fan and blow the air in a radial direction of the fan by rotating about a fan axis
Data Source
AI summary
A blower includes a fluid introducing box, a fan, a casing, a tubular portion disposed inside the fan to introduce a first fluid and a second fluid separately into the fan, and an upper end portion defining an inlet into the tubular portion. The casing has a suction port forming portion defining a suction port. The upper end portion is disposed between the suction port forming portion and the fluid introducing box. A gap passage is defined between the upper end portion and the suction port forming portion. At least one of the first fluid or the second fluid is introduced into the gap passage from a passage inlet and fluids through the gap passage toward a downstream portion. A distance between the upper end portion and the suction port forming portion in the axial direction at the downstream portion is less than that at the passage inlet.