Blowers with variable nozzles
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Solution Overview
Problem
Existing hand-held blowers lack an efficient method to adjust air flow velocity and pressure without increasing fan speed, which can reduce operating efficiency and require tedious nozzle changes, with a risk of nozzles being misplaced.
Innovation Solution
A blower design featuring a variable nozzle with adjustable air control surfaces that can be moved between positions using a nozzle adjustment tube, allowing for adjustments in air flow velocity and pressure without changing fan speed, utilizing a combination of exterior and interior cam surfaces for smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If fan speed is increased to achieve higher velocity and pressure, then air flow velocity and pressure are improved, but operating time and efficiency are reduced
Solution Approach 1:
The nozzle is designed with movable air control surfaces that can dynamically adjust the exhaust outlet geometry. This allows the system to change its characteristics during operation, enabling velocity and pressure adjustment without changing fan speed, thus preserving operating time and efficiency.
Solution Approach 2:
The invention changes the geometric parameters of the exhaust outlet by moving air control surfaces between different positions. This alters the flow characteristics and pressure distribution at the nozzle exit, achieving different velocity and pressure outputs from the same fan speed.
2Adaptability or versatility
If multiple separate interchangeable nozzles are provided for adjusting velocity and pressure, then adaptability is improved, but device complexity and ease of operation are worsened due to manual removal and attachment
Solution Approach 1:
The nozzle incorporates movable air control surfaces that can be adjusted during operation through a adjustment tube mechanism. This eliminates the need to stop the blower and manually swap nozzles, providing continuous adjustability and significantly improving ease of operation while maintaining adaptability.
Solution Approach 2:
The single nozzle structure integrates multiple functions by incorporating adjustable air control surfaces that can assume different positions. This replaces the need for multiple separate nozzles, as one universal nozzle can provide various flow characteristics through its adjustable components.
3Adaptability or versatility
If multiple separate interchangeable nozzles are used, then adaptability is improved, but reliability is worsened due to risk of misplacement and loss
Solution Approach 1:
The invention uses a single integrated nozzle structure with adjustable components rather than multiple separate nozzles. This eliminates the risk of losing or misplacing interchangeable nozzles, while the adjustable air control surfaces within the single nozzle provide the necessary adaptability for different operating conditions.
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
Enables simple and efficient adjustment of air flow velocity and pressure by rotating the nozzle adjustment tube, increasing or decreasing velocity and pressure without affecting fan speed, reducing the risk of nozzle loss and improving user convenience.
Implementation Method 1
Each of the plurality of air control surfaces comprises an exterior raised cam surface. The nozzle adjustment tube includes one or more interior raised cam surfaces. Movement of the one or more interior raised cam surfaces relative to the exterior raised cam surfaces along a longitudinal axis causes movement of the air control surfaces between a first position and the second position.
Data Source
AI summary
A blower includes a main body which includes a housing and a fan disposed in the housing. The housing further defines an air discharge opening. The blower further includes an extension tube connected to the air discharge opening, the extension tube extending between a first end connected to the air discharge opening and a second end. The blower further includes a variable nozzle, the variable nozzle including a plurality of adjustable air control surfaces. The blower further includes a nozzle adjustment tube connected to the second end of the extension tube and at least partially surrounding the variable nozzle.