Vacuuming Device Comprising a Vacuum Cleaner and a Bag Filter

Abstract

The invention relates to a vacuum-ceaning apparatus comprising a vacuum cleaner and a filter bag made of non-woven fabric, wherein the vacuum cleaner has a nominal electric input power of less than 1200 W, preferably less than 1100 W, more preferably less than 900 W, wherein the vacuum cleaner comprises a motor-fan unit and a controlling device controlling the vacuum cleaner such that the airflow is kept substantially constant at a value of at least 34 l/s, preferably substantially constant at a value of at least 37 l/s, more preferably substantially constant at a value of at least 40 l/s when the filter bag is loaded with DMT8 test dust analogous to EN 60312, and wherein the filter bag is a disposable filter bag made of non-woven fabric which has an airflow drop of less than 15%, preferably less than 10%, more preferably less than 5% in tests demonstrating the reduction of the maximum airflow with a partially filled dust container analogous to EN 60312.

1 . Vacuum-cleaning apparatus comprising a vacuum cleaner and a filter bag made of non-woven fabric, wherein
 the vacuum cleaner has a nominal electric input power of less than 1200 W   the vacuum cleaner comprises a motor-fan unit and a controlling device controlling the vacuum cleaner such that the airflow is kept substantially constant at a value of at least 34 l/s, when the filter bag is loaded with DMT8 test dust analogous to EN 60312, and   the filter bag is a disposable filter bag made of non-woven fabric which has an airflow drop of less than 15 in tests demonstrating a reduction of a maximum airflow with a partially filled dust container analogous to EN 60312.   
     
     
         2 . The apparatus according to  claim 1 , wherein the controlling device is an electronic controlling device adapted to control an electric input power of the motor-fan unit, 
     
     
         3 . The apparatus according to  claim 2 , wherein an increase of the input power of the motor-fan unit required to maintain the substantially constant airflow when the filter bag is loaded with DMT8 dust analogous to EN 60312 is not more than 35% in relation to the input power of the motor-fan unit when the filter bag is empty. 
     
     
         4 . The apparatus according to  claim 1 , wherein the motor-fan unit comprises a reluctance motor. 
     
     
         5 . The apparatus according to  claim 1 , wherein the controlling device comprises a throttle valve provided to control the airflow to be substantially constant. 
     
     
         6 . The apparatus according to  claim 1 , wherein the controlling device is adapted such that a negative pressure downstream of the filter bag is used as a controlled variable. 
     
     
         7 . The apparatus according to  claim 1 , wherein the controlling device is adapted such that a negative pressure upstream of the filter bag is used as a controlled variable, 
     
     
         8 . The apparatus according to  claim 1 , wherein the controlling device is provided such that the flow rate measured at an optional position in the flow path is used as a controlled variable. 
     
     
         9 . The apparatus according to  claim 1 , wherein the filter bag is a flat bag. 
     
     
         10 . The apparatus according to  claim 1 , wherein the filter bag comprises at least one surface fold. 
     
     
         11 . The apparatus according to  claim 1 , wherein the motor-fan unit is adapted such that the vacuum cleaner generates, with a filter bag being inserted, with an orifice 0 a negative pressure between 30 kPa and 6 kPa, and
 with an orifice 8 (40 mm) an airflow of more than 50 l/s.   
     
     
         12 . The apparatus according to  claim 1 , wherein the vacuum cleaner has, with an orifice 8 (40 mm), a rate of airflow of more than 250 W. 
     
     
         13 . The apparatus according to  claim 1 , wherein the motor-fan unit has, with an orifice 8 (40 mm), an efficiency according to EN 60312 of at least 20%. 
     
     
         14 . The apparatus according to  claim 1 , wherein the vacuum cleaner comprises a filter bag change indicator indicating if, during the vacuum-cleaning, the airflow drops under a substantially constant value for a predetermined period. 
     
     
         15 . The apparatus according to  claim 1 , wherein the filter bag has a volume in a range of 1.5 l to 8 l measured according to EN 60312. 
     
     
         16 . The apparatus according to  claim 1 , wherein the vacuum cleaner has a nominal electric input power of less than 900 W. 
     
     
         17 . The apparatus according to  claim 1 , wherein the airflow is kept substantially constant at a value of at least 40 l/s. 
     
     
         18 . The apparatus according to  claim 1 , wherein the disposable filter bag made of non-woven fabric which has an airflow drop of less than 5% in tests demonstrating the a reduction of the a maximum airflow with a partially filled dust container analogous to EN 60312. 
     
     
         19 . The apparatus according to  claim 3 , wherein the increase of the input power of the motor-fan unit required to maintain the substantially constant airflow when the filter bag is loaded with DIMT8 dust analogous to EN 60312 is not more than 15% in relation to the input power of the motor-fan unit when the filter bag is empty. 
     
     
         20 . The apparatus according to  claim 4 , wherein the motor-fan unit comprises a switched reluctance motor.