Immersed Surface Cleaning Device Provided with a Nonreturn Inlet Conduit

Abstract

The invention relates to am immersed surface cleaning device comprising a filtering chamber ( 6 ) provided, through a lower rigid wall ( 8 ), with at least one liquid inlet ( 9 a, 9 b ) which has a non-return unit at least one filter ( 7 ) remote from each liquid inlet ( 9 a, 9 b ) in such a way that a solid impurities retaining area ( 12 ) is defined and with a hydraulic circuit for forming a liquid flow by pumping means ( 4 ). At least one non-return unit comprises an anti-return conduit ( 20 ) which extends through the retaining area ( 12 ) away from the liquid inlet and whose free end ( 21 ) enters said retaining area (12), wherein the conduit is used for preventing at least the passage of impurities in an opposite direction from the retaining area through the liquid inlet at least when said pumping means is unused.

1 . An immersed surface-cleaning device comprising: 
 a filtration chamber with:    a stiff lower wall extending facing the surface to be cleaned and between two axles bearing rolling components intended for rolling on the surface to be cleaned,    at least one liquid inlet into filtration chamber, each liquid inlet provided through said lower wall and given a non-return device, and    at least one filter extending a distance from each liquid inlet so that holding zone for solid impurities is defined between liquid inlet(s) and filter(s),    a hydraulic circuit suitable for forming a circulation of liquid through liquid inlet(s) and into filtration chamber under the effect of pumping means,    wherein at least one non-return device of liquid inlet consists of a conduit, a so-called non-return conduit, suitable for extending into holding zone from liquid inlet and said lower wall, having free end opening into holding zone, and for preventing passage at least of impurities in the opposite direction from holding zone through liquid inlet at least when pumping means are inactive.    
   
   
       2 . A device according to  claim 1 , wherein liquid inlet situated in the lower part of filtration chamber, and filter(s) extending above this liquid inlet non-return conduit extends upward into holding zone at least when pumping means are active and when the device is facing a horizontal surface portion.  
   
   
       3 . A device according to  claim 1 , wherein non-return conduit has end opening at the upper part of holding zone under the filter(s) and a distance from the filter(s).  
   
   
       4 . A device according to  claim 1 , wherein-non-return conduit is stiff.  
   
   
       5 . A device according to  claim 1 , wherein-non-return conduit has at least one distal part formed by flexible sleeve capable of flattening on itself and closing spontaneously when pumping means are inactive.  
   
   
       6 . A device according to  claim 5 , wherein flexible sleeve is suited so that it is not capable of spontaneously turning inside-out in the opposite direction.  
   
   
       7 . A device according to  claim 5 , wherein flexible sleeve is made of a material based on synthetic fibers.  
   
   
       8 . A device according to  claim 5 , wherein non-return conduit has stiff base extending into holding zone from liquid inlet and suitable for receiving flexible sleeve.  
   
   
       9 . A device according to  claim 8 , wherein flexible sleeve is suited so that it can be mounted on base in a removable manner in order to allow changing of this flexible sleeve.  
   
   
       10 . A device according to  claim 1 , wherein free end of non-return conduit opens horizontally or downward.  
   
   
       11 . A device according to  claim 5 , wherein free end of non-return conduit opens upward.  
   
   
       12 . A device according to  claim 1 , wherein non-return conduit is suitable for forming at least one baffle starting from liquid inlet.  
   
   
       13 . A device according to  claim 1 , wherein each non-return device consists of non-return conduit.  
   
   
       14 . A device according to  claim 1 , wherein with holding zone having at least one concave holding volume, generally elongated horizontally between two end portions, at least one liquid inlet is arranged at the lower part and offset on the side of an end portion of concave holding volume.  
   
   
       15 . A device according to  claim 14 , wherein for each concave holding volume, it has a single liquid inlet.  
   
   
       16 . A device according to  claim 14 , wherein it has two concave holding volumes on both sides of transverse motor casing, the two liquid inlets being on opposite sides from one another.  
   
   
       17 . A device according to  claim 1 , wherein it has at least two liquid inlets arranged on both sides of a median transverse zone of lower wall.  
   
   
       18 . A device according to  claim 17 , wherein each liquid inlet is flared towards the axle to which it is closest.  
   
   
       19 . A device according to  claim 1 , wherein it has at least one pumping component situated in the upper part of the device, and at least one electric motor device for driving this pumping component.  
   
   
       20 . A device according to  claim 1 , wherein said stiff lower wall is mounted so as to be removable with respect to stiff casing wall that defines a lower opening closed by lower wall, and by the fact that it has filter mounted on stiff lower wall so as to cover each liquid inlet.  
   
   
       21 . A device according to  claim 20 , wherein filter is mounted on said lower wall in such a way as to extend at least roughly on the periphery of the lower opening when said lower wall is in place.  
   
   
       22 . A device according to  claim 21 , wherein filter is mounted on the periphery of said lower wall, which is contiguous with the periphery of the lower opening of stiff casing wall.