Vacuum Nozzle Holder Bracket Design to Reduce Air Leakage and Noise
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Solution Overview
Problem
Existing vacuum nozzle systems in central vacuum systems suffer from inconsistent air velocity due to varying cross-sectional areas, wear-related operational changes, blockage issues, air leakage, and noise pollution, which reduce suction performance and cause clogging and noise when nozzles are stored.
Innovation Solution
A vacuum nozzle system with a smooth inner wall and external ribs, a holder bracket with a tongue that matches the nozzle's surface profile for sealing, and notched end surfaces to prevent air leakage and clogging, ensuring consistent suction and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the nozzle is placed within an opening in the holster upstream of the entrance opening, then the nozzle is securely stored, but air leakage occurs causing noise and reducing vacuum performance
Solution Approach 1:
The holder is extracted from the traditional holster opening engagement and repositioned to engage downstream of the entrance opening, removing the source of air leakage and noise while maintaining secure storage
Solution Approach 2:
Instead of engaging the nozzle upstream of the entrance opening as in conventional holsters, the holder engages downstream of the entrance opening, reversing the engagement position to eliminate air leakage and noise generation
2Strength
If vertical stiffeners are added near the entrance opening to provide structural support, then the nozzle structural strength is improved, but blockage points are created that trap objects
Solution Approach 1:
The vertical stiffeners near the entrance opening are completely removed, eliminating the blockage points that trapped objects while structural support is maintained through alternative means
Solution Approach 2:
Structural support is transitioned from vertical stiffeners to longitudinal ribs that extend along the curved section, changing the dimension and orientation of structural elements to avoid blockage at the entrance opening
3Shape
If the cross-sectional area of the nozzle grows and then reduces in steps, then the nozzle provides structural definition, but inconsistent air velocity is created
Solution Approach 1:
The nozzle cross-section is designed with uniform area through the curved section, applying local quality control to maintain consistent air velocity in the critical flow region while allowing structural definition elsewhere
4Duration of action of stationary object
If the nozzle end face becomes worn and marred during use, then the nozzle continues to function, but air leakage increases causing noise and energy loss
Solution Approach 1:
The sealing interface is designed so that wear on the nozzle end face does not compromise the seal, as the holder engages downstream where wear does not occur, converting the harmful effect of wear into a non-issue
Solution Approach 2:
The holder acts as an intermediary sealing element that compensates for nozzle wear, maintaining the seal between the holder and nozzle even as the nozzle end face becomes worn during use
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 solution provides reliable suction, reduces noise pollution, and maintains vacuum performance across the system by eliminating internal stiffeners, accommodating wear, and preventing clogging, while ensuring secure nozzle storage and easy object handling.
Implementation Method 1
a vacuum flow direction from the inlet opening to the outlet opening... when the nozzle is in a retained position on the holder bracket
Data Source
AI summary
A vacuum nozzle system has a vacuum nozzle with an inlet opening for engaging a surface to be vacuumed and an outlet opening for connection to a vacuum supply hose. The inlet opening is delimited by a circumferential end face. The nozzle defining a vacuum flow direction from the inlet opening to the outlet opening. A holder bracket has a holder for holding the nozzle. The holder is disposed downstream of the end face in a vacuum flow in the vacuum flow direction when the nozzle is in a retained position on the holder bracket.