Vacuum cleaner
AssigneeVorwerk & Co. Elektrowerke KG
InventorsWieland Guhne, Klaus Hoffmann
Life of this patent
Estimating the term…
Abstract
A housing in a vacuum cleaner is subdivided into a first space and a separate second space which does not communicate with the first space but is in heat-exchanging relationship with the first space. An impeller is located in the second space for sucking dust-laden air into one end of the second space and discharging it out the other. The drive motor for the impeller means is located in the first space. Thus, the drive means is not contacted by the dust-laden air passing through the second space but is nevertheless cooled by such dust-laden air.
Claims18
In a vacuum cleaner, particularly a hand-held vacuum cleaner, in combination, a housing;
- a blower unit in the housing, said blower unit forming a flow path for the passage of dust-laden air through said housing;
- a motor unit in the housing in driving relation with said blower unit, the motor unit being located in the housing in a motor unit space separate from the flow path formed by the blower unit so that dust in the dust-laden air passing through the blower unit is prevented from reaching the motor unit, the motor unit space being jointly defined by the internal surfaces of the housing and the external surfaces of the blower unit, the motor unit space having the form of air conduits forming a closed flow circuit for cooling air and containing the motor unit;
- heat-exchanging means for effecting an exchange of heat between the air in the motor unit space and the air passing through the blower unit;
- and dust-removing means for removing from the air in the motor unit space carbon dust discharged into such air by the motor unit during operation of the latter.
In a vacuum cleaner, particularly a hand-held vacuum cleaner, in combination means defining a first air passage forming a closed circuit for air and a second air passage which extends through the first passage in heat-exchanging relationship therewith but does not communicate with the first passage;
- impeller means in the second passage for sucking dust-laden air into one end of the second passage and discharging the dust-laden air from the other end of the second passage;
- an electric drive motor in the first passage connected to the impeller means in the second passage for driving the impeller means;
- additional impeller means in the first passage also driven by the drive motor for establishing in the first passage a flow of circulating air, to effect cooling of the drive motor by virtue of the heat exchange between the air travelling in the second passage and the air travelling in the first passage;
- and means operative during drive motor operation for continually removing from the air circulating in the first passage carbon dust discharged into such air by the electric drive motor.
In a vacuum cleaner, particularly a hand-held vacuum cleaner, in combination, housing means defining a first space and a separate second space which is surrounded by but does not communicate with the first space;
- impeller means in the second space for sucking dust-laden air into one end of the second space and discharging it out the other;
- drive means for driving the impeller means, the drive means being located in the first space so as not to be contacted by the dust-laden air passing through the second space but so as to be nevertheless cooled by such dast-laden air;
- and heat-exchanging means for effecting an exchange of heat between the air in the first space and the impelled air in the second space.
Dependencies are inferred from the claim text.