Portable Blower Discharge Rim With Wear-Resistant Metal Insert
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Solution Overview
Problem
Portable blowers experience performance degradation due to progressive wear at the discharge end rim, affecting air discharge patterns, velocity, and volume, leading to inefficient operation and increased maintenance costs, as the rim's configuration changes over time, compromising the optimal matching between the propulsion unit and discharge opening.
Innovation Solution
Incorporating a discrete metal ring component made from a harder material than the conduit assembly, which is operatively connected to the rim, providing enhanced resistance to abrasive wear and impact, and is designed to maintain the original shape and area of the discharge opening, thereby preventing wear-induced performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the rim at the discharge end is made from plastic material to minimize weight, then the blower can be held in an elevated position during use, but the rim experiences progressive wear that changes the configuration of the discharge opening and deteriorates performance
Solution Approach 1:
The patent applies composite materials by combining plastic material for the conduit body with a metal insert (such as brass, stainless steel, or aluminum) for the rim at the discharge end. This composite construction allows the lightweight plastic to minimize overall blower weight while the metal insert provides wear resistance and durability at the critical discharge opening area, resolving the contradiction between weight minimization and reliability.
Solution Approach 2:
The patent applies local quality by providing enhanced material properties (metal insert) only at the specific location where wear resistance is critical (the rim at the discharge end), rather than making the entire conduit from heavy metal. This localized reinforcement maintains overall lightweight design while protecting the vulnerable area experiencing repetitive impact and dragging against hard surfaces.
2Productivity
If the rim configuration is kept constant to maintain optimal air discharge patterns, then consistent operating characteristics are achieved, but wear progressively alters the rim shape and discharge opening area
Solution Approach 1:
The metal insert material provides superior resistance to abrasive wear and impact compared to plastic, preventing progressive alteration of the rim configuration. This maintains the original discharge opening shape and area, ensuring consistent air discharge patterns, velocity, and volume throughout the blower's service life, thereby preserving productivity and operating characteristics.
Solution Approach 2:
The metal insert is pre-installed in the conduit body before final assembly, providing preemptive protection against wear at the discharge end. This preliminary protective measure prevents wear from occurring in the first place, rather than attempting to restore or replace worn components after performance degradation.
3Ease of manufacture
If the rim is integrated with other conduit and fitting components to simplify construction, then manufacturing is easier, but replacement becomes costly and inconvenient when wear occurs
Solution Approach 1:
The patent segments the rim component from the conduit body by using a separate metal insert that can be independently replaced. The insert is designed as a discrete component that fits into the conduit body and can be removed and replaced without replacing the entire conduit assembly, facilitating easy maintenance and repair while maintaining manufacturing simplicity through modular construction.
Solution Approach 2:
The metal insert is extracted as a separate, replaceable component from the conduit assembly. This allows the wear-prone rim portion to be removed and replaced independently when worn, without discarding the entire conduit or fitting components, thereby reducing repair costs and simplifying maintenance operations.
4Weight of moving object
If plastic material is used for the conduit and fittings to reduce weight, then the blower remains lightweight for user handling, but the material lacks resistance to abrasive wear and impact
Solution Approach 1:
The patent combines plastic material (providing lightweight properties) with metal insert material (providing wear resistance and strength). The plastic conduit body maintains overall lightweight design for easy user handling, while the metal insert at the discharge end provides the necessary resistance to abrasive wear and impact that plastic alone cannot provide.
Solution Approach 2:
The patent applies local quality by concentrating the high-strength, wear-resistant metal material only at the discharge end rim where it is most needed, rather than making the entire conduit from heavy metal. This localized application provides necessary strength and wear resistance while minimizing overall weight increase.
Data Source
AI summary
A portable blower having a propulsion unit for continuously generating a supply of pressurized fluid and a conduit assembly for controllably directing fluid from the propulsion unit to and through a discharge opening on the conduit assembly. The discharge opening is bounded by a rim, defined at least partially by a discrete component made from a first material. The conduit assembly has a first portion made from a second material to which the discrete component is operatively connected. The first material is at least one of: a) more resistant to abrasive wear than the second material; b) more resistant to impact than the second material; and c) harder than the second material.