Hot air generator device with improved lighting

Abstract

A hot air generating device of the type including an injection device ( 2 ) capable of producing a flow of a combustible gas mixture at a high speed and a burner head ( 3 ) in which the flow is ignited via a spark plug ( 6 ) positioned near the burner ( 3 ) and electrically connected to a lighter ( 12 ), preferably a piezoelectric lighter, including an autotransformer mounted in parallel between the lighter and the spark plug. Such a device is particularly advantageous to facilitate the lighting of the mixture, in particular when the device is provided with a riser between the lighter and the spark plug.

1 . A hot air generating device of the type comprising an injection device ( 2 ) capable of producing a flow of a combustible gas mixture at a high speed and a burner head ( 3 ) in which the flow is ignited via a spark plug ( 6 ) positioned near said burner ( 3 ) and electrically connected to a lighter ( 7 ), preferably a piezoelectric lighter, 
       characterized in that it also comprises means ( 9 ) to reduce the capacitive losses between the lighter and the spark plug. 
     
     
         2 . The device according to  claim 1 , characterized in that it comprises a riser tube between the injection device ( 2 ) and the burner ( 3 ). 
     
     
         3 . The device according to  claim 1 , characterized in that the means ( 9 ) for reducing losses comprise means to make the increase in the voltage (T 6 ) at the terminals of the spark plug ( 6 ) more gradual. 
     
     
         4 . The device according to  claim 3 , characterized in that the means ( 9 ) for reducing losses comprise a transformer ( 9 ), of the autotransformer type, mounted in parallel with the lighter ( 7 ). 
     
     
         5 . The device according to  claim 4 , characterized in that the transformer ( 9 ) is mounted as a step-down transformer. 
     
     
         6 . The device according to  claim 4 , characterized in that the transformer ( 9 ) is mounted near the lighter ( 7 ). 
     
     
         7 . The device according to  claim 2 , characterized in that the means ( 9 ) for reducing losses comprise means to make the increase in the voltage (T 6 ) at the terminals of the spark plug ( 6 ) more gradual. 
     
     
         8 . The device according to  claim 7 , characterized in that the means ( 9 ) for reducing losses comprise a transformer ( 9 ), of the autotransformer type, mounted in parallel with the lighter ( 7 ). 
     
     
         9 . The device according to  claim 8 , characterized in that the transformer ( 9 ) is mounted as a step-down transformer. 
     
     
         10 . The device according to  claim 5 , characterized in that the transformer ( 9 ) is mounted near the lighter ( 7 ). 
     
     
         11 . The device according to  claim 10 , characterized in that the transformer ( 9 ) is mounted near the lighter ( 7 ).