Air Blower Fixed Blade Angle Design for Static Pressure Efficiency

Solution Overview

Problem

The existing air blower designs with fixed blades at the downstream side of a fan suffer from reduced static pressure efficiency due to varying jet directions in the radial direction and inefficiencies in collecting dynamic pressure, which are influenced by the shape differences of the fixed blades.

Innovation Solution

The air blower incorporates a fan with radially arranged fixed blades that are curved from the inner circumferential part towards the outer circumferential part, featuring greater inflow and chord angles at the inner and outer parts compared to the radial center, and an outflow angle of 0° to 50°, along with a bell-mouth shaped first accommodation member and a cylindrical second member to support the blades, optimizing airflow direction and pressure collection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If fixed blades are installed at the downstream side of the fan to convert dynamic pressure energy into static pressure energy, then static pressure efficiency should be improved, but the static pressure efficiency is decreased due to different jet directions in radial direction and inefficient dynamic pressure collection

Engineering Contradiction:

Improvestatic pressure efficiencyVSAvoiddynamic pressure collection efficiency

Core Design Contradiction:

PowerVSLoss of energy

Solution Approach 1:

The fixed blades are designed with different angles at different radial positions. Specifically, the angle between the tangent line of the fixed blade and the rotational axis direction varies from the center to the outer periphery, allowing each region of the blade to optimally handle the local airflow characteristics and convert dynamic pressure to static pressure efficiently

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the geometric parameters of the fixed blades, specifically the angle between the tangent line and the rotational axis direction. This angle is set to be greater at the center and smaller at the outer periphery, optimizing the conversion of dynamic pressure to static pressure across different radial positions where airflow characteristics differ

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If the air blower uses a simple structure with fan and fixed blades, then manufacturing cost is reduced, but static pressure efficiency is decreased due to inability to efficiently collect dynamic pressure

Engineering Contradiction:

Improvemanufacturing costVSAvoidstatic pressure efficiency

Core Design Contradiction:

Ease of manufactureVSPower

Solution Approach 1:

The fixed blades are designed with different angles at different radial positions. Specifically, the angle between the tangent line of the fixed blade and the rotational axis direction varies from the center to the outer periphery, allowing each region of the blade to optimally handle the local airflow characteristics and convert dynamic pressure to static pressure efficiently

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the geometric parameters of the fixed blades, specifically the angle between the tangent line and the rotational axis direction. This angle is set to be greater at the center and smaller at the outer periphery, optimizing the conversion of dynamic pressure to static pressure across different radial positions where airflow characteristics differ

Inventive Principle:

Principle #35Parameter changes

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 enhances static pressure efficiency by effectively collecting dynamic pressure and reducing inflow resistance, while maintaining structural integrity and reducing manufacturing costs through the use of low-cost materials like resin molding.

Implementation Method 1

a fan which rotates in a predetermined direction around a rotational axis

Methodology Applied

Scientific EffectRotation:

Implementation Method 2

a rotating fan with a plurality of rotating blades

Methodology Applied

Scientific EffectCentrifugal force: Centrifugal Force

Implementation Method 3

the radially-shaped crossbars have a shape radiating in a circular arc to be inclined in an axial direction of the propeller fan to have a function of converting dynamic pressure energy of a vortex which flows from the propeller fan into static pressure energy

Methodology Applied

Scientific EffectDynamic pressure to static pressure conversion: Bernoulli Effect

Data Source

PatentUS10578322B2Outdoor unit of air conditioner

Publication Date: 2020.03.03 SAMSUNG ELECTRONICS CO LTD

AI summary

The present invention is provided to improve static pressure efficiency in an air blower provided with a fixed blade on the downstream side of a fan. The air blower includes: a fan which rotates in a predetermined direction around a rotational axis; and a plurality of fixed blades which are arranged radially around the rotational axis on the downstream side in the advancing direction of an airflow generated by the rotation of the fan and are curved in the opposite direction to the rotation direction of the fan from an inner circumferential part toward an outer circumferential part, wherein the fixed blades are configured in such a manner that an inlet angle formed between an inlet end through which the airflow flows and the rotational axis, and a chord angle formed between a chord connecting the inlet end to an outlet end through which the airflow is discharged and the rotating axis, are greater in the inner circumferential part and the outer circumferential part than in the radial center portion, and an outflow angle formed between the outlet end and the rotational axis is greater than 0° and less than 50°.