Preheating Device

Abstract

A preheating device intended for use in aluminothermic welding operations consists of a housing ( 12 ), which receives a nozzle ( 8 ) and is provided with a liquid gas feed ( 9 ), and a vaporizer ( 10 ), which is arranged downstream of the nozzle in the direction of flow, wherein the housing ( 12 ) has on its end facing a casting mould a combustion space, which ends in an outflow opening ( 11 ) for combustion gases and receives the nozzle, and a portion ( 22 ), which encloses the outflow opening ( 11 ) and can be inserted into an opening formed in the upper side of the casting mould, and wherein the vaporizer ( 10 ) is located between the outflow opening ( 11 ) and the nozzle ( 8 ), thereby being in heat exchange with the combustion gases.

1 - 9 . (canceled) 
     
     
         10 . A preheating device for casting mold ( 3 ) for use in aluminothermic welding, comprising a housing ( 12 ) that receives a nozzle ( 8 ) and is provided with a liquid gas feed ( 9 ), and a vaporizer ( 10 ) that is arranged upstream of the nozzle ( 8 ) in the direction of flow of the liquid gas, characterized in that the housing ( 12 ) has a combustion space which ends in an outflow opening ( 11 ) for combustion gases and accommodates the nozzle ( 8 ) at the farthest end thereof in the direction of flow, that the vaporizer ( 10 ) is located between the outflow opening ( 11 ) and the nozzle ( 8 ), thereby being in heat exchange with the combustion gases, that the housing ( 12 ) is furnished with at least one laterally projecting pipe socket serving ( 13 ,  14 ) to introduce combustion air under ambient conditions, and which protrudes laterally from the housing ( 12 ) in such manner that at least no substantial aspiration of combustion gases rising out of the casting mold ( 3 ) takes place. 
     
     
         11 . The preheating device according to  claim 10 , characterized in that the pipe socket ( 13 ,  14 ) is attached at such a point of the housing ( 12 ) that is located on the side of the housing ( 12 ) facing away from a discharge opening ( 15 ) of nozzle ( 8 ). 
     
     
         12 . The preheating device according to  claim 10 , characterized in that the vaporizer ( 10 ) is represented by a line that runs along the inside of the housing ( 12 ) and is in surface contact with the combustion gases for heat exchange. 
     
     
         13 . The preheating device according to  claim 10 , characterized in that the housing ( 12 ) is designed so that a gas cartridge can be mounted thereon, and can be connected to the liquid gas feed ( 9 ). 
     
     
         14 . The preheating device according to  claim 10 , characterized in that at least one of the pipe sockets ( 13 ,  14 ) is operatively connected to a fan that is designed for the purpose of introducing additional combustion air into the housing ( 12 ). 
     
     
         15 . The preheating device according to  claim 11 , characterized in that the vaporizer ( 10 ) is represented by a line that runs along the inside of the housing ( 12 ) and is in surface contact with the combustion gases for heat exchange. 
     
     
         16 . The preheating device according to  claim 11 , characterized in that the housing ( 12 ) is designed so that a gas cartridge can be mounted thereon, and can be connected to the liquid gas feed ( 9 ). 
     
     
         17 . The preheating device according to  claim 12 , characterized in that the housing ( 12 ) is designed so that a gas cartridge can be mounted thereon, and can be connected to the liquid gas feed ( 9 ). 
     
     
         18 . The preheating device according to  claim 11 , characterized in that at least one of the pipe sockets ( 13 ,  14 ) is operatively connected to a fan that is designed for the purpose of introducing additional combustion air into the housing ( 12 ). 
     
     
         19 . The preheating device according to  claim 12 , characterized in that at least one of the pipe sockets ( 13 ,  14 ) is operatively connected to a fan that is designed for the purpose of introducing additional combustion air into the housing ( 12 ). 
     
     
         20 . The preheating device according to  claim 13 , characterized in that at least one of the pipe sockets ( 13 ,  14 ) is operatively connected to a fan that is designed for the purpose of introducing additional combustion air into the housing ( 12 ).