Vacuum cleaner suction nozzle with height adjustment and bleed valve
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Solution Overview
Problem
Vacuum cleaners experience suction lock when cleaning certain carpet surfaces, leading to reduced airflow and increased negative pressure, which prevents easy movement and can cause motor overheating, as existing height adjustment mechanisms are ineffective on newer carpet designs with soft or densely-packed fibers.
Innovation Solution
A vacuum cleaner nozzle assembly with a height adjustment mechanism and a bleed valve that opens to relieve pressure when the nozzle is adjusted to a higher position, allowing air to bypass the suction passage and prevent suction lock, while maintaining maximum suction on hard floors and low-pile carpets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the inlet opening is positioned close to the surface to maximize suction on hard floors and low-pile carpets, then cleaning effectiveness is improved, but suction lock occurs on high-pile or soft carpets causing reduced airflow and motor overheating
Solution Approach 1:
The bleed valve is configured to open automatically in response to height adjustment mechanism movement, dynamically changing the airflow path based on operating conditions. When the nozzle is raised for high-pile carpets, the bleed valve opens to allow air to enter through the bypass opening, preventing suction lock and maintaining motor cooling airflow.
2Ease of operation
If existing height adjustment mechanisms are used to raise the inlet opening, then movement ease is improved on certain surfaces, but they are ineffective on newer carpet designs with soft or densely-packed fibers
Solution Approach 1:
The system uses the height adjustment mechanism as a feedback signal to automatically control the bleed valve. When the user raises the nozzle (detected by the height adjustment mechanism), this triggers the bleed valve to open, automatically adapting the airflow characteristics to match the surface type without requiring user intervention.
Solution Approach 2:
The bleed valve system self-adjusts based on the nozzle position. The height adjustment mechanism's movement automatically actuates the bleed valve through mechanical linkage, allowing the system to self-regulate airflow without additional user input or complex electronic controls.
3Reliability
If a bleed valve is added to relieve pressure, then suction lock is reduced, but device complexity increases
Solution Approach 1:
The bleed valve control is merged with the existing height adjustment mechanism through mechanical linkage. The same user action that adjusts nozzle height also automatically controls the bleed valve, combining two functions into one integrated system without adding separate controls or complex electronics.
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 effectively reduces suction lock on high-pile or soft carpets, ensuring easy movement and maintaining cleaning effectiveness by allowing airflow relief through the bleed valve when the nozzle is adjusted for such surfaces.
Implementation Method 1
a bleed valve configured to open in response to movement of the height adjustment mechanism from the first position to the second position, thereby relieving pressure within the vacuum cleaner
Implementation Method 2
a motor-driven vacuum fan that draws air into the vacuum cleaner through a suction inlet
Data Source
AI summary
A vacuum cleaner nozzle assembly having an inlet opening, a height adjustment mechanism configured to adjust a vertical position of the inlet opening relative to a surface to be cleaned, a suction passage fluidly connected to the inlet opening, a bypass opening fluidly connected to the suction passage, and a bleed valve. The bleed valve has a closed position in which the bleed valve blocks the bypass opening, and an open position in which the bleed valve does not block the bypass opening to allow a flow of air through the bypass opening and into the suction passage. The bleed valve is configured to move from the closed position to the open position in response to an adjustment of the height adjustment mechanism.