IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0322071
(2009-01-27)
|
등록번호 |
US-8142554
(2012-03-27)
|
발명자
/ 주소 |
- Eckstein, Daniel
- Langen, Thorsten
|
출원인 / 주소 |
- Alfred Kaercher GmbH & Co. KG
|
대리인 / 주소 |
Lipsitz & McAllister, LLC
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
38 |
초록
▼
The invention relates to a method for cleaning filters of a vacuum cleaner having a dirt collecting container, which has a suction inlet and is in flow connection with at least one suction unit via at least one filter and at least one suction extraction line, and at least one external air inlet whic
The invention relates to a method for cleaning filters of a vacuum cleaner having a dirt collecting container, which has a suction inlet and is in flow connection with at least one suction unit via at least one filter and at least one suction extraction line, and at least one external air inlet which opens into the suction extraction line downstream of the filter and can be closed by means of a closing valve. The closing valve has a movable valve body acted upon by a closing spring with a closing force and, in the closed position, additionally by a magnetic holder with a magnetic holding force. In order to clean the filter, at least one closing valve is opened and the side of the filter oriented away from the dirt collecting container is impinged upon by external air. A vacuum cleaner for carrying out the method is also provided.
대표청구항
▼
1. Method for cleaning the filters of a vacuum cleaner, the vacuum cleaner comprising a dirt collecting container, which dirt collecting container has a suction inlet and is in flow connection with at least one suction unit via at least one filter and at least one suction extraction line, and at lea
1. Method for cleaning the filters of a vacuum cleaner, the vacuum cleaner comprising a dirt collecting container, which dirt collecting container has a suction inlet and is in flow connection with at least one suction unit via at least one filter and at least one suction extraction line, and at least one external air inlet which opens into the suction extraction line downstream of the at least one filter and which is adapted to be closed by means of at least one closing valve, wherein the at least one closing valve has a valve body which is movable back and forth between a closed position, in which the valve body lies against a valve seat, and an open position, in which the valve body is at a distance from the valve seat, wherein the valve body is acted upon by a closing spring with a closing force and, in the closed position, the valve body is additionally acted upon by a magnetic holder with a magnetic holding force, the method comprising: while the suction unit is switched on and during a suction operation of the vacuum cleaner, opening the at least one closing valve such that a side of the at least one filter that is oriented away from the dirt collecting container is impinged upon by external air, and subsequently closing the at least one closing valve again,after the at least one suction unit is switched off, opening and closing the at least one closing valve again at least once such that the side of the at least one filter that is oriented away from the dirt collecting container is impinged upon at least once more by the external air,wherein: the magnetic holder is equipped with an electromagnet, to which current is applied to close the at least one closing valve, andthe current supply to the electromagnet is switched off at the same time that the suction unit is switched off. 2. Method according to claim 1, wherein after the suction unit is switched off, the at least one closing valve is repeatedly opened and closed again. 3. Method according to claim 1, wherein: a closing force of the closing spring is made to act permanently on the valve body, irrespective of its position, anda repulsion force of a resilient stop element is additionally made to act upon the valve body in a position at a distance from the valve seat. 4. Method according to claim 1, wherein the vacuum cleaner is equipped with a single filter. 5. Method according to claim 1, wherein an entire surface area of the side of at least one filter that is oriented away from the dirt collecting container is impinged upon by external air by opening a single closing valve. 6. Method according to claim 1, wherein the at least one closing valve is actuated electronically. 7. Method according to claim 1, wherein the at least one closing valve is actuated in a time-controlled manner. 8. Method according to claim 7, wherein the at least one closing valve is actuated periodically at time intervals of less than 30 seconds. 9. Vacuum cleaner, comprising: at least one suction unit,at least one filter,at least one suction extraction line,a dirt collecting container, which has a suction inlet and is in flow connection with the at least one suction unit via the at least one filter and the at least one suction extraction line,at least one external air inlet which opens into the suction extraction line downstream of the at least one filter,at least one closing valve adapted to close the at least one external air inlet, the at least one closing valve having a valve body which is movable back and forth between a closed position, in which the valve body lies against a valve seat, and an open position, in which the valve body is at a distance from the valve seat, the valve body being acted upon by a closing spring with a closing force and, in the closed position, the valve body being additionally acted upon by a magnetic holder with a magnetic holding force,wherein: while the suction unit is switched on and during a suction operation of the vacuum cleaner, the at least one closing valve is opened such that a side of the at least one filter that is oriented away from the dirt collecting container is impinged upon by external air, and subsequently the at least one closing valve is closed again,after the suction unit is switched off, the at least one closing valve is automatically opened at least once and then closed again such that the side of the at least one filter that is oriented away from the dirt collecting container can be impinged upon at least once more by the external air,the magnetic holder has an electromagnet, to which current can be applied to close the at least one closing valve, andthe current supply to the electromagnet is adapted to be switched off at the same time that the suction unit is switched off. 10. Vacuum cleaner according to claim 9, wherein after the suction unit is switched off, the at least one closing valve can be automatically opened and closed again repeatedly. 11. Vacuum cleaner according to claim 9, wherein associated with the valve body is a resilient stop element, which acts with a repulsion force upon the valve body in a position at a distance from the valve seat. 12. Vacuum cleaner according to claim 11, wherein the resilient stop element is configured as a stop spring. 13. Vacuum cleaner according to claim 12, wherein a spring constant of the stop spring is greater than a spring constant of the closing spring. 14. Vacuum cleaner according to claim 12, wherein the closing spring and the stop spring are configured as helical springs of different diameters, one of the two helical springs circumferentially surrounding the other helical spring. 15. Vacuum cleaner according to claim 9, wherein the suction unit and the electromagnet are connected via a common switching element to voltage supply terminals. 16. Vacuum cleaner according to claim 9, wherein the electromagnet is connected to a control unit for the time-dependent control of the electromagnet. 17. Vacuum cleaner according to claim 9, wherein: the electromagnet is disposed on a valve holder that forms the valve seat, andthe valve body has a magnetizable element which is associated with the electromagnet and forms a closed magnetic circuit with the electromagnet in the closed position of the valve body. 18. Vacuum cleaner according to claim 9, wherein the vacuum cleaner has a single filter. 19. Vacuum cleaner according to claim 18, wherein the side of the filter is adapted to be impinged upon by external air over an entire surface area by opening of the at least one closing valve. 20. Vacuum cleaner according to claim 9, wherein the valve body is movable continuously from the closed position via the open position back into the closed position. 21. Vacuum cleaner according to claim 9, wherein the at least one filter is adapted to be impinged upon by external air by means of the at least one closing valve for less than 400 milliseconds. 22. Vacuum cleaner according to claim 9, wherein the at least one filter is adapted to be impinged upon by external air by means of the at least one closing valve while maintaining a negative pressure in a region of an opening of a suction hose opening into the suction inlet.
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