Cleaning device, in particular for robotic vacuum cleaners
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Robotic vacuum cleaners face challenges in achieving high air flow rates and efficiently removing diverse impurities due to limited power and internal space constraints, leading to inadequate cleaning performance, especially with large low-density objects and fine dust particles.
Innovation Solution
A design featuring a convex transfer surface between a flat nozzle and rotary brush, connected to a centrifugal fan's spiral housing via a multi-channel air flow straightener, which directs high-velocity air flow directly to the floor, optimizing air flow distribution and minimizing energy losses, while a rotary brush aids in collecting particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a narrow suction nozzle is used to achieve high air flow rate, then fine dust removal is improved, but large low-density objects cannot be effectively collected
Solution Approach 1:
The suction nozzle is divided into multiple channels with different cross-sectional areas. Some channels have smaller cross-sections optimized for fine dust particles, while other channels have larger cross-sections capable of accommodating large low-density objects. This segmentation allows the single nozzle to handle diverse impurity sizes simultaneously, resolving the contradiction between high air flow rate for fine dust and collection capability for large objects.
2Productivity
If mechanical brushes are used to remove coarse dirt, then mechanical cleaning effect is improved, but energy consumption increases
Solution Approach 1:
The invention replaces mechanical brush cleaning with pneumatic cleaning using high-velocity air streams. Compressed air is directed through nozzles to impact and remove coarse dirt particles from surfaces. This pneumatic approach eliminates the need for mechanical brush rotation, significantly reducing energy consumption while maintaining effective cleaning performance for various surface types.
3Productivity
If the joint between suction nozzle and floor is made as narrow as possible, then fine dust suction is improved, but the boundary layer thickness cannot be sufficiently reduced
Solution Approach 1:
Instead of solely reducing the joint width in the horizontal dimension, the invention introduces a vertical dimension component by using inclined nozzles that direct air flow at an angle toward the floor. This multi-dimensional approach allows the air stream to penetrate more effectively through the boundary layer, achieving both narrow joint configuration for fine dust suction and sufficient air flow velocity to reduce boundary layer thickness and improve overall suction efficiency.
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 solution enhances air flow velocity and efficiency, effectively removing fine dust and large impurities by maintaining a dynamic balance between mechanical and aerodynamic effects, improving overall cleaning performance and reducing energy consumption.
Implementation Method 1
a centrifugal fan (7) with an impeller (46) having slightly backwards bent blades
Implementation Method 2
By means of a set of air ducts with a small cross-section, the invention provides a sufficient flow at a given flow rate, while the sufficiently low hydraulic dimension of the individual air ducts creates the conditions for laminar flow
Implementation Method 3
The air flowing rapidly above the surface generates an area of lower static pressure above the surface than below it, namely, for example, between the fibres of the carpet. This creates the desired upward suction
Implementation Method 4
a partially encapsulated rotary brush (1) driven by an electric motor (8)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The subject matter of the cleaning device according to the invention lies in the fact that a convex transfer surface (13) is arranged between the flat nozzle and the rotary brush (1). The flat nozzle is formed as a multichannel nozzle (12) between the convex transfer surface (13) and the apron (26) with the bevel of the mouth of the multichannel nozzle (12) ranging from 20 to 60 degrees from the horizontal plane, the clearance height between the convex transfer surface (13) and the floor (14) is in the range of 1 to 8 millimetres.