Odor trap for a waterless or low-flush urinal

Abstract

An odor trap has a basin-shaped housing and a collecting basin, which forms an inlet. Inserted into the housing is a siphon which prevents the passage of gas from an outlet to the inlet. A deodorizing insert is located on a screen below the inlet in an essentially dry area. Air ascending out of the siphon flows over the deodorizing insert and is thereby deodorized. The deodorizing insert is located under a cover and can be replaced along with the siphon.

1 . An odor trap for a waterless or low-flush urinal with a basin-shaped housing which is connected on an upper end to an inlet and on a lower end to an outlet that leads to a drain line, with a siphon that prevents the passage of gas from the outlet to the inlet, and with deodorizing means located underneath the inlet in an essentially dry area.  
     
     
         2 . The odor trap according to  claim 1 , wherein the deordorizing means is a deodorizing insert.  
     
     
         3 . The odor trap according to  claim 2 , wherein the deodorizing insert is located under a cover.  
     
     
         4 . The odor trap according to  claim 2 , wherein the deodorizing insert is a solid body.  
     
     
         5 . The odor trap according to  claim 4 , wherein the solid body is a deodorizing block.  
     
     
         6 . The odor trap according to  claim 2 , wherein the deodorizing insert sits on a screen.  
     
     
         7 . The odor trap according to  claim 6 , wherein the screen, on its underside, has backwater means, by which ascending odors can be deflected outwardly.  
     
     
         8 . The odor trap according to  claim 3 , wherein the outside of the deodorizing insert, together with the cover, form a circulation space for un-deodorized air.  
     
     
         9 . The odor trap according to  claim 2 , wherein the deodorizing insert is held in place by fins on the cover.  
     
     
         10 . The odor trap according to  claim 1 , further including downwardly extending inlet pipe located underneath the inlet.  
     
     
         11 . The odor trap according to  claim 10 , wherein the inlet pipe has a mouth on a lower end, below which there is an upwardly curving wall of a dip tube.  
     
     
         12 . The odor trap according to  claim 1 , wherein below the inlet there are circulation openings through which ascending air can circulate.  
     
     
         13 . The odor trap according to  claim 2 , wherein the deodorizing insert is located in a replaceable siphon insert.  
     
     
         14 . The odor trap according to  claim 1 , wherein the inlet is located in a collecting basin which is inserted into a urinal basin.  
     
     
         15 . The odor trap according to  claim 14 , wherein on the underside of the collecting basin there is a siphon insert, which forms a replaceable unit with the collecting basin.  
     
     
         16 . A siphon insert for an odor trap of a waterless or low-flush urinal with a basin-shaped housing connected on an upper end to an inlet and on a lower end to an outlet that leads to a drain line, with a siphon that prevents the passage of gas from the outlet to the inlet, wherein the siphon insert is a deodorizing insert positioned in an upper and essentially dry area of the housing.  
     
     
         17 . The siphon insert according to  claim 16 , wherein the deodorizing insert is located underneath a cover.  
     
     
         18 . The siphon insert according to  claim 16 , wherein the deodorizing insert sits on a screen.