Precoated filter for the filtration of flowing media

Abstract

In a particularly noise-free and vibration-free operating precoated filter for filtering for example cooling lubricating means, a filter candle 12 surrounding a riser channel 16 is mounted by means of a riser tube 15 in a separating plate 5 in an axially moveable manner. A filter cake adhering to the outside of the filter candle 12 is loosened in such a manner that for example a disk-shaped rotary body 40 comprises a shoulder 42 between the track end 43 and the track start 44 along its track 41. As soon as a head end piece 20 connected to the riser tube 15 and moveable in an axial manner against the force of a spring 21 is released from the rotating track end 41, the stored force of the spring 21 accelerates the filter candle 12, so that the filter cake adhering to the filter candles is loosened by the acceleration of the filter candle 12 and the impact pulse when a dampening ring arranged between the filter candle 12 and the separating plate 5 abuts the separating plate.

1 . Precoated filter for filtering flowing media, in particular lubricating and cooling lubricating means comprising a separating plate arranged in the filter housing and separating the filter housing into a lower filtrant chamber and an upper filtrate chamber, to which are connected filter candles which enclose a riser channel connecting the chambers for catching contaminations or solids from the medium, and which comprises a device for loosening the solids dried to a filter cake, characterized in that the device comprises a rotary body ( 40 ;  50 ), with which the filter candles ( 12 ) can be loaded with a pulse individually or in a group.  
     
     
         2 . Precoated filter according to  claim 1 , characterized in that the rotary body ( 40 ;  50 ) for producing the pulse comprises at least one shoulder ( 42 ;  60 ) in the form of a step for producing the pulse.  
     
     
         3 . Precoated filter according to  claim 1  or  2 , characterized in that the rotary body ( 40 ;  50 ) is arranged in the filtrate chamber.  
     
     
         4 . Precoated filter according to one of  claims 1  to  3 , characterized in that the filter candles ( 12 ) are arranged in a concentric manner around a center axis, whereby the rotary body ( 40 ;  50 ) comprises a circular track ( 41 ;  53 ,  54 ) with a shoulder ( 42 ;  60 ) in the form of a step for each concentric filter ring.  
     
     
         5 . Precoated filter according to  claim 4 , characterized in that the tracks ( 41 ;  53 ,  54 ) have a helical shape.  
     
     
         6 . Precoated filter according to one of  claims 1  to  5 , characterized in that the rotary body comprises several shoulders, whereby tracks with a larger radius preferably have arranged thereon more shoulders than tracks with a smaller radius.  
     
     
         7 . Precoated filter according to one of  claims 1  to  6 , characterized in that the rotary body is a disk ( 40 ) and the shoulder or the shoulders ( 42 ) form a displacement ( 42 ) between track parts ( 43 ,  44 ) at the flat side ( 41 ′) of the disk formed at the tracks ( 41 )  
     
     
         8 . Precoated filter according to  claim 7 , characterized in that the disk preferably comprises apertures in the shape of segments in the flat side of the disk.  
     
     
         9 . Precoated filter according to one of  claims 1  to  8 , characterized in that several helical rings ( 51 ,  52 ) which are connected by radial webs ( 55 ,  56 ,  57 ,  58 ) form the rotary body ( 50 ).  
     
     
         10 . Precoated filter according to one of  claims 1  to  9 , characterized in that the riser channel ( 16 ) ends in an upper head piece ( 24 ;  124 ) which is mounted to the separating plate ( 5 ;  105 ) in an axially moveable manner, and which can be moved in the axial direction by means of the tracks ( 41 ;  53 ,  54 ).  
     
     
         11 . Precoated filter according to  claim 10 , characterized in that an energy storage device such as a spring ( 21 ) is provided between the head piece ( 24 ;  124 ) or a head end piece ( 20 ;  120 ) and the separating plate ( 5 ) which can be loaded by the axial movement of the riser channel.  
     
     
         12 . Precoated filter according to  claim 10  or  11 , characterized in that the head piece ( 124 ) is mounted in the separating plate ( 105 ) by means of a sleeve ( 125 ), which projects beyond the lower side ( 105 ′) of the separating plate by means of a sleeve projection ( 180 ).  
     
     
         13 . Precoated filter according to one of  claims 10  to  12 , characterized in that the head piece ( 124 ) or the head end piece ( 120 ) comprises a preferably semi-spherical arcuate front end ( 129 ) cooperating with the rotary bodies ( 40 ;  50 ).  
     
     
         14 . Precoated filter according to one of  claims 1  to  13 , characterized in that a preferably ring-shaped or hollow frustoconical dampening body ( 19 ;  19 ′) is arranged between the filter candle ( 12 ) and the separating plate ( 5 ;  105 ) or the sleeve front face ( 181 ).  
     
     
         15 . Precoated filter according to one of  claims 1  to  14 , characterized in that the separating plate ( 5 ;  105 ) is mounted in the wall ( 2 ,  3 ) of the housing or in a flange ring formed or secured at the wall of the housing, whereby dampening materials ( 36 ,  37 ,  38 ) are arranged between the separating plate ( 5 ;  105 ) and the wall ( 2 ,  3 ) of the housing or the flange ring.  
     
     
         16 . Precoated filter according to one of  claims 1  to  15 , characterized in that the rotary body ( 40 ;  50 ) can be driven by means of an electronic drive ( 31 ) arranged outside of the housing ( 1 ).  
     
     
         17 . Precoated filter according to one of  claims 1  to  16 , characterized in that the tracks ( 41 ;  53 ,  54 ) climb continually from the track start ( 44 ;  63 ) to the track end ( 43 ;  61 ,  64 ).  
     
     
         18 . Precoated filter according to one of  claims 1  to  17 , characterized in that the device comprises a freewheeling arrangement such as a sleeve freewheeling arrangement or a ratchet freewheeling arrangement for the rotary body.  
     
     
         19 . Precoated filter according to one of  claims 1  to  18 , characterized in that the device for loosening the solids comprises several rotary bodies ( 140 ,  150 ;  240 ,  250 ), which can preferably be driven by means of a single common drive.  
     
     
         20 . Precoated filter according to one of  claims 1  to  19 , characterized by a modular construction, whereby several filter candles which are arranged concentrically around a field axis form a filter candle field (P), and a rotary body mounted on the field axis (M) by means of the shaft ends ( 281 ) at the top of the housing is assigned to each candle field (F), whereby the shafts ( 281 ) of the rotary bodies are preferably coupled to the particularly centrally arranged drive shaft ( 232 ) by tensioning means such as cog belts or V-belts or gears and circulate with the same speeds during rotation.  
     
     
         21 . Precoated filter according to one of  claims 1  to  19 , characterized in that the filter candles are arranged concentrically around a center axis and that the device comprises two rotary bodies ( 140 ;  150 ) which rotate by means of a gear; preferably a tension gear ( 180 ), with different speeds, whereby the speed translation of the gear is preferably chosen in such a way that the rotary bodies ( 140 ;  150 ) comprise the same circumferential speeds.  
     
     
         22 . Precoated filter according to  claim 21 , characterized in that one rotary body ( 140 ) is connected to the drive shaft ( 132 ) in a non-rotary manner and that the second rotary body ( 150 ) is mounted at the drive shaft ( 132 ) in a rotary manner.  
     
     
         23 . Precoated filter according to one of  claims 1  to  22 , characterized in that the head end pieces can be exchanged and are formed in particularl as screw pins which can be screwed into the cap plates, provided with a rounded head and possibly hardened at the head and/or that the tracks are formed by exchangeable ring segment elements ( 357 ,  359 ) which are secured to the rotary body in a detachable manner.  
     
     
         24 . Precoated filter according to  claim 23 , characterized in that the rotary body ( 350 ) comprises at least two wings, mounting plates ( 353 A,  353 B) or the like which are oblique to one another and to the separating plate, and/or two obliques ( 363 A,  363 B) which are arranged in a counter-rotating manner with regard to one another for securing the exchangeable elements ( 357 ,  359 ).