Sliding Inner-Pipe Nozzle for Fast Vacuum-Blower Mode Switching
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Solution Overview
Problem
Conventional vacuum blowers face challenges in increasing air flow rate during sucking work and delivering rectilinearly directed wind during blowing work, while also requiring a large amount of sliding motion for quick switching between modes.
Innovation Solution
A vacuum blower design featuring a nozzle with a slidable inner pipe that switches between sucking and blowing states by adjusting ejection ports, allowing pressurized wind to be directed internally within the pipe for enhanced airflow and directional control, facilitated by a cam mechanism and rotary operating member for efficient switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pressurized wind is ejected along the outside of the front pipe in conventional vacuum blowers, then the structure is simple, but the air flow rate and initial velocity of sucked objects cannot be increased
Solution Approach 1:
The nozzle is divided into an inner pipe and an outer pipe, creating separate flow paths. The inner pipe directs pressurized wind along its inner surface to the discharge port, while the outer pipe allows pressurized wind to be ejected along its outer surface, enabling independent optimization of suction and blowing functions
Solution Approach 2:
The inner pipe is nested within the outer pipe, with the inner pipe positioned coaxially inside the outer pipe. This nested configuration allows both pipes to share the same space efficiently while maintaining distinct airflow paths, increasing air flow rate without significantly increasing overall device volume
2Productivity
If the front pipe is slid a large distance to switch between sucking and blowing modes, then mode switching is achievable, but the switching time increases
Solution Approach 1:
The nozzle structure employs dynamic positioning where the inner pipe can slide relative to the outer pipe along the central axis. By sliding only a short distance, the division plate redirects pressurized wind between the inner and outer flow paths, enabling quick switching between vacuum and blower modes without requiring large structural movements
Solution Approach 2:
The division plate acts as an intermediary element that redirects pressurized wind flow. When the inner pipe slides, the division plate switches the ejection path of pressurized wind between the inner pipe's discharge port and the outer pipe's outer surface, enabling mode switching through a simple mechanical movement
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 design enhances airflow volume and initial velocity during sucking work and delivers rectilinearly directed wind during blowing work, while reducing the required sliding motion for quick and efficient mode switching.
Implementation Method 1
The pressurized wind ejected from the ejector 40A passes through the inside of the pipe 10 along the inner surface of the pipe 10 and is ejected to the discharge port 10B. This pressurized wind causes the pressure inside the pipe 10 to be lowered, thereby to generate suction flow (negative pressure) in the pipe 10 from the suction port 10A toward the discharge port 10B.
Implementation Method 2
The pressurized wind ejected from the ejector 40A passes through the inside of the pipe 10 along the inner surface of the pipe 10 and is ejected to the discharge port 10B.
Data Source
AI summary
Provided is a vacuum blower, when used as a vacuum for sucking work, capable of increasing air flow with a larger volume of air sucked from a suction port and increasing the initial velocity (sucking rate) of sucked objects near the suction port, and when used as a blower for blowing work, capable of delivering rectilinearly directed wind from the blowing port and quickly switching between sucking work and blowing work. By sliding an inner pipe disposed inside a pipe relative to the pipe, opposite end portions of the inner pipe come into close contact with opposite end portions (turn portions) of a nozzle facing the opposite end portions of the inner pipe, such that one ejection port is closed and the other ejection port is opened to allow pressurized wind generated by a blower fan to be ejected along the inside of the inner pipe to switch between sucking state and blowing state.