Filter cleaning for dirt suction devices comprising an external fan

Abstract

A dirt suction device comprises at least two filters ( 3, 4 ) which are arranged on/in a dirt suction device housing ( 1 ), are affected by an air stream from a fan ( 21 ), and include valves ( 26 - 34 ) for separately controlling the cleaning action of the filter, wherein during normal operation, the dirt-laden air stream passes through at least one filter from the untreated air side to the clean air side, and at least one of the valves is associated with each of the at least two filters, said valve switching over in the cleaning position such that the air stream in the filter is reversed and the dirt particles adhering to the untreated air side are removed, wherein the fan of the dirt suction device is arranged outside the dirt suction device housing.

1 . Dirt suction device having at least two filters ( 3 ,  4 ), which are arranged on/in a dirt suction device housing ( 1 ) and which are affected by an air stream from a fan ( 21 ) and include valves ( 30 ,  31 ;  30   a,    31   a ) for separately controlling the cleaning action of the filter ( 3 ,  4 ), wherein during normal operation, the dirt-laden air stream passes through at least one filter ( 3 ,  4 ) from the untreated air side to the clean air side, and at least one of the valves is associated with each of the at least two filters ( 3 ,  4 ), said valve switching over in the cleaning position in such a way that the air stream in the respective filter ( 3  or  4 ) is reversed and the dirt particles adhering to the untreated air side are removed, and the at least one fan ( 21 ) is arranged outside the dirt suction device housing ( 1 ), characterized in that the dirt suction device itself has no fan, i.e., dirt suction device and fan ( 21 ) are arranged separate from one another and are connected in airtight manner via a pipe connection or pipe joint connection. 
     
     
         2 . Dirt suction device according to  claim 1 , wherein the dirt suction device and fan ( 21 ) are arranged on a mutual carriage ( 46 ). 
     
     
         3 . Dirt suction device according to  claim 2 , wherein the fan ( 21 ) is silenced and is arranged on the carriage in a vibration-damped manner. 
     
     
         4 . Dirt suction device according to  claim 1 , further comprising a plurality of fans ( 21 ) and wherein at least one of the fans ( 21 ) is a stationary fan. 
     
     
         5 . Dirt suction device according to  claim 1 , wherein the filter ( 3 ,  4 ) is designed as a filter cartridge or a flat filter, which can be controlled by means of at least one solenoid ( 28 ,  29 ). 
     
     
         6 . Dirt suction device according to  claim 5 ,  claim 1 , wherein the individual solenoids ( 26 ,  27 ) are arranged circular and evenly distributed around the circumference and are fixed at a central attachment ( 48 ) of the dirt suction device housing ( 1 ). 
     
     
         7 . Dirt suction device having a valve control for cleaning at least one filter ( 3 ,  4 ), in which during the cleaning action at least one valve situated in the suction opening of the filter to be cleaned is closed, and at least one valve used for cleaning is opened, wherein the valve control comprises at least one solenoid ( 26 ,  27 ), one valve plate ( 30   a,    30   b ) and one valve rod ( 28 ,  29 ), wherein the valve plate ( 30   a,    30   b ) is firmly connected with the respective valve rod ( 28 ,  29 ) of the respective solenoid ( 26 ,  27 ) and is spring-loaded by a spring ( 33 ) in its closed condition. 
     
     
         8 . Dirt suction device having a valve control according to  claim 7 , wherein several filter cartridges or flat filters can be controlled separately from one another by means of the valve control. 
     
     
         9 . (canceled) 
     
     
         10 . A dirt suction device having a valve control according to  claim 7 , wherein the valve control is designed such that at least one stroke magnet ( 26 ,  27 ) is without current, and the controlled valve rod ( 28 ,  29 ) corresponding thereto is disposed in the open setting solely by means of its own weight and the pressure difference between the intermediate chamber ( 16 ,  17 ) and the suction chamber ( 13 ). 
     
     
         11 . Dirt suction device having a valve control according to  claim 7 , wherein by switching the valve flaps ( 30 ,  31 ) cleaning air enters a filter ( 3 ,  4 ) through a cleaning opening ( 40 ).