Vacuum cleaning device, comprising a unit with a movable surface for generating an oscillating airflow
US8857013B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 2011 |
| Grant date | Oct 14, 2014 |
| Priority date | — |
| Expiry date | Nov 1, 2031 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47L9/0072
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A vacuum cleaning device comprises a unit (1) in which an oscillating airflow is generated which substantially zero net flow and an asymmetry between the suction and the blowing phases, such that in the blowing phase a jet is generated. A generator (31) which is needed for generating the oscillating airflow comprises a movable surface (30) which is integrated in a wall (12) of a housing (10) having an internal space (11) and at least one opening (13) for allowing air to flow to and from the internal space (11). The jet can be generates when the so-called Strouhal number, being the frequency of the movement of the movable surface (30) multiplied by a characteristic dimension of the opening (13) and divided by the velocity of the air in the opening (13), is not higher than a predetermined maximum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.