Bidirectional Blower Scroll Rib Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Bidirectional blowers used in ventilation seats require optimization to achieve optimal flow performance and prevent vortex generation, as they differ from unidirectional blowers in flow characteristics, necessitating specific design variables such as scroll rib shape and size, blade inlet and outlet angles, and rib lengthening to ensure effective air distribution to both seat cushions and backs.
Innovation Solution
A bidirectional blower design featuring a blower body with a perimeter scroll and triangular rib shape that extends at an acute angle, combined with fan blades having acute inlet and obtuse outlet angles, to maximize air flow rate and prevent vortex generation, with separate discharge ports for seat cushions and backs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the scroll length is increased to improve air flow rate, then the flow rate performance is enhanced, but vortex generation occurs at the outlet end portion
Solution Approach 1:
The patent changes the geometric parameters of the scroll rib, specifically optimizing its length, shape, and position. By adjusting these parameters, the scroll rib guides air flow smoothly along the scroll wall to the discharge port, preventing vortex generation while maintaining high flow rate performance
Solution Approach 2:
The scroll rib acts as an intermediary element between the scroll cavity and the discharge port. It mediates the air flow by providing a guided path that prevents direct turbulent discharge, thereby eliminating vortex formation while preserving flow rate
2Productivity
If the number of blades is increased to improve air intake, then the flow rate is enhanced, but the device complexity increases
Solution Approach 1:
The patent optimizes the parameters of existing blades, specifically the inlet angle and outlet angle. By carefully selecting these angular parameters, the blades achieve maximum air intake efficiency without needing to increase the number of blades, thus avoiding increased device complexity
3Productivity
If the rib length is extended to increase scroll length, then the air flow guidance is improved, but the discharge area is reduced
Solution Approach 1:
The patent optimizes the rib length parameter to achieve the right balance. The scroll rib is extended enough to provide effective flow guidance along the scroll wall, but its dimensions are carefully controlled to prevent excessive encroachment on the discharge area, maintaining both flow guidance efficiency and discharge capacity
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
The optimized design enhances air flow rate performance, reduces noise, and ensures efficient air distribution to both seat components without generating vortices, improving ride comfort and operational efficiency.
Implementation Method 1
a bidirectional blower having a plurality of blades (wings) and a motor is mounted to a lower end portion of a seat, and air in a lower end portion of the seat, which is drawn by a rotation of the blades generated by a motor control, blows towards a seat cushion and a seat back
Implementation Method 2
each of the bidirectional discharge ports is formed as a scroll structure for securing a flow rate. Here, the scroll means a zone where a space between the blade inside the blower and an outer case is gradually increased
Implementation Method 3
optimization for a rib shape, that does not form a vortex generation at an outlet end portion when a scroll is increased through an rib application, is required
Data Source
AI summary
A bidirectional blower may include a blower body having a scroll rib making a length of an entire perimeter scroll guiding air flow in an internal space to an outlet end portion where air discharge is performed, and a fan in which a blade having an inlet angle of an acute angle and an outlet angle of an obtuse angle draws external air into the internal air, thereby realizing the characteristics of lowering an operating noise by preventing a generation of vortex while enhancing air volume performance suitable for a ventilation seat.