Drying circuit for dry-cleaning machines, using n-propyl bromide solvent

Abstract

A drying circuit for dry-cleaning machines using n-propyl bromide solvent, consisting of the fact that the coil of a refrigeration unit is immersed in the primary solvent tank. At top ends thereof the tank is connected to the drum with pipes for the passage of the drying air, the free surface of the solvent in the tank constituting a cooling agent for the air.

What is claimed is:  
     
         1 . In a dry-cleaning machine using a n-propyl bromide solvent, having a primary tank, a washing drum, a fan, heaters and a refrigeration unit provided with a coil, a drying circuit comprising: the primary solvent tank filled with a quantity of solvent which provides a free surface thereof; the coil of the refrigeration unit which is immersed in the solvent provided in the primary tank; and passage pipes for passage of drying air which connect top end of said tank to the washing drum, so that the drying air is circulated through said pipes over the free surface of the solvent in the primary tank which constitutes a cooling agent for the drying air.  
     
     
         2 . The circuit of  claim 1 , wherein said passage pipes comprise a connecting pipe providing fluid communication between the tank and the fan and a return pipe for fluid return connection to the primary tank, said return pipe being connected to and downstream of the heaters and to the primary is tank.  
     
     
         3 . The circuit of  claim 1 , wherein said passage pipes comprise a connecting pipe, providing fluid communication between the fan and the primary tank, and a return pipe for fluid return connection between the primary tank and the heaters, said return pipe being in fluid communication with a region located downstream of the heaters.  
     
     
         4 . The circuit of  claim 1 , further comprising respective valves having different actuation periods, for optimizing operation of the drying circuit, said valves being fitted along at least one of said passage pipes.