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Internal burner type flame spray method and apparatus having material introduction into an overexpanded gas stream

  • US 4,568,019 A
  • Filed: 04/20/1984
  • Issued: 02/04/1986
  • Est. Priority Date: 02/24/1984
  • Status: Expired due to Term
First Claim
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1. A flame spray method comprising the steps of:

  • continuously combusting, under pressure, a continuously supplied compressed combustible gas and fuel mixture including oxygen within an internal burner combustion chamber,discharging the hot combustion product gases from at least one combustion chamber orifice through a single large diameter expansion chamber open at its downstream end to the atmosphere via an exit port while feeding material to be sprayed through said expansion chamber concurrently with said products of combustion by introduction of the material to the products of combustion outside of said combustion chamber, said large diameter chamber being sized in excess to the flow stream diameter of said products of combustion entering said chamber;

    whereby, said material is heat softened or melted to form a spray for impact against a workpiece downstream of the exit port of said chamber after acceleration to high velocity by the flame jet comrpising said stream of products of combustion which pass through said chamber and exiting therefrom,and wherein said method further comprises controlling the operation of said internal burner and sizing the cross-sectional area of said at least one combustion chamber orifice relative to said exit port diameter of said expansion chamber, such that the pressure within said expansion chamber is maintained sub-atmospheric during operation.

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