# US 5,704,825 A · Blast nozzle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,704,825 A - Document ID: US5704825A - Status: Granted - Kind: A - Application number: 08/786,824 - Filed: 1997-01-21 - Granted: 1998-01-06 - Earliest claimed: 1997-01-21 - Inventors: Gerard J. LeCompte - Web page: https://patentgrep.com/patent/US5704825A ## CPC - B24C 1/086: {Descaling; Removing coating films} - B05B 1/00: Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means (B05B3/00, B05B5/00, B05B7/00 take precedence; devices for applying liquids or other fluent materials to surfaces by contact B05C; nozzles for ink-jet printing mechanisms B41J2/135; nozzles for liquid-dispensing, e.g. in vehicle service stations, B67D7/42) - B05B 1/02: designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, {or having an outlet of particular shape}(B05B1/26, B05B1/28, B05B1/34 take precedence) - B24C 5/04: Nozzles therefor (nozzles in general B05B) - B24C: ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL - B05B: SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES (spray-mixers with nozzles B01F25/72; processes for applying liquids or other fluent materials to surfaces by spraying B05D) ## Abstract The improved blast nozzle comprises an inlet portion, an outlet portion and a square venturi orifice connecting the inlet and outlet portions. The inlet portion includes a square inlet for receiving the air and abrasive particle mixture with a pair of opposing flat top and bottom walls and a pair of opposing flat lateral walls. The opposing flat top and bottom walls and opposing flat lateral walls form a four sided pyramidal shape which converges to the square venturi. The outlet portion is similarly shaped and includes a pair of opposing flat top and bottom walls and a pair of opposing flat lateral walls. The opposing flat top and bottom walls and the opposing flat lateral walls form a four sided pyramidal shape also which diverges from the square venturi to a square outlet for directing the air and abrasive particle mixture. The nozzle body is typically constructed of an abrasion resistant material such as tungsten carbide. The nozzle body is then placed within an outer metal shell and a shock absorbing elastomeric material such as urethane is then cast between the nozzle body and outer metal shell to form a protective layer. The outer metal shell has threads formed on the inlet end of the nozzle to allow connection to a standard air supply line. ## Claims ### Claim 1 A nozzle liner for the mixing of a propellant fluid and an abrasive particle mixture, said nozzle liner comprising: an inlet portion and an outlet portion, said inlet portion having a converging interior volume of square cross section, said outlet portion having a diverging interior volume of square cross section, and said inlet portion converging interior volume and said outlet portion diverging interior volume tapering to a square cross section venturi intermediate said inlet and said outlet portions to provide fluid communication between said converging interior volume and said diverging interior volume. ### Claim 2 (depends on 1) A nozzle liner for the mixing of a propellant fluid and an abrasive particle mixture according to claim 1 wherein: said nozzle liner is composed of an abrasion resistant material. ### Claim 3 (depends on 2) A nozzle liner for the mixing of a propellant fluid and an abrasive particle mixture according to claim 2 wherein: said abrasion resistant material is tungsten carbide, silicon carbide, silicon nitride, or boron carbide. ### Claim 4 A nozzle for the mixing of a propellant fluid and an abrasive particle mixture, said nozzle comprising: a nozzle liner having an inlet portion and an outlet portion, said inlet portion having a converging interior volume of square cross section, said outlet portion having a diverging interior volume of square cross section, and said inlet portion converging interior volume and said outlet portion diverging interior volume tapering to a square cross section venturi intermediate said inlet and said outlet portions to provide fluid communication between said converging interior volume and said diverging interior volume, and an outer body surrounding said nozzle liner. ### Claim 5 (depends on 4) A nozzle for the mixing of a propellant fluid and an abrasive particle mixture according to claim 4 wherein: said nozzle liner is composed of an abrasion resistant material. ### Claim 6 (depends on 5) A nozzle for the mixing of a propellant fluid and an abrasive particle mixture according to claim 5 wherein: said nozzle liner abrasion resistant material is tungsten carbide, silicon carbide, silicon nitride, or boron carbide. ### Claim 7 (depends on 6) A nozzle for the mixing of a propellant fluid and an abrasive particle mixture according to claim 6 wherein said outer body includes: coupling means adjacent said inlet portion for connecting said nozzle to a propellant fluid supply means. ### Claim 8 (depends on 7) A nozzle for the mixing of a propellant fluid and an abrasive particle mixture according to claim 7 wherein: said coupling means is a threaded connection. ### Claim 9 (depends on 8) A nozzle for the mixing of a propellant fluid and an abrasive particle mixture according to claim 8 wherein said outer body includes: an outer sheath surrounding said nozzle liner, and an inner sheath between said nozzle liner and said outer sheath to provide an impact resistant layer. ### Claim 10 A nozzle liner for the mixing and accelerating of a propellant fluid and an abrasive particle mixture, said nozzle liner comprising: an inlet portion, an outlet portion and a square cross section venturi orifice connecting said inlet portion and said outlet portion, said inlet portion including a square inlet for receiving said propellant fluid and abrasive particle mixture and having a first pair of opposing flat top and bottom walls, a first pair of opposing flat lateral walls, said first pair of opposing flat top and bottom walls and said first pair of opposing flat lateral walls converging to said square cross section venturi, and said outlet portion including a square outlet for directing said propellant fluid and abrasive particle mixture and having a first pair of opposing flat top and bottom walls, a first pair of opposing flat lateral walls, said first pair of opposing flat top and bottom walls and said first pair of opposing flat lateral walls diverging from said square venturi to said outlet. ### Claim 11 (depends on 10) A nozzle for the mixing of a propellant fluid and an abrasive particle mixture according to claim 10 wherein: said nozzle liner is composed of an abrasion resistant material. ### Claim 12 (depends on 11) A nozzle liner for the mixing of a propellant fluid and an abrasive particle mixture according to claim 11 wherein: said abrasion resistant material is tungsten carbide, silicon carbide, silicon nitride, or boron carbide. ### Claim 13 A nozzle for the mixing and accelerating of a propellant fluid and an abrasive particle mixture, said nozzle comprising: a nozzle liner having an inlet portion, an outlet portion and a square cross section venturi orifice connecting said inlet portion and said outlet portion, said inlet portion including a square inlet for receiving said propellant fluid and abrasive particle mixture and having a first pair of opposing flat top and bottom walls, a first pair of opposing flat lateral walls, said first pair of opposing flat top and bottom walls and said first pair of opposing flat lateral walls converging to said square cross section venturi, said outlet portion including a square outlet for directing said propellant fluid and abrasive particle mixture and having a first pair of opposing flat top and bottom walls, a first pair of opposing flat lateral walls, said first pair of opposing flat top and bottom walls and said first pair of opposing flat lateral walls diverging from said square venturi to said outlet, and an outer body surrounding said nozzle liner. ### Claim 14 (depends on 13) A nozzle for the mixing and accelerating of a propellant fluid and an abrasive particle mixture according to claim 13 wherein: said nozzle liner is composed of an abrasion resistant material. ### Claim 15 (depends on 14) A nozzle for the mixing and accelerating of a propellant fluid and an abrasive particle mixture according to claim 14 wherein: said nozzle liner abrasion resistant material is tungsten carbide, silicon carbide, silicon nitride, or boron carbide. ### Claim 16 (depends on 15) A nozzle for the mixing and accelerating of a propellant fluid and an abrasive particle mixture according to claim 15 wherein said outer body includes: coupling means adjacent said inlet portion for connecting said nozzle to a propellant fluid supply means. ### Claim 17 (depends on 16) A nozzle for the mixing and accelerating of a propellant fluid and an abrasive particle mixture according to claim 16 wherein: said coupling means is a threaded connection. ### Claim 18 (depends on 17) A nozzle for the mixing and accelerating of a propellant fluid and an abrasive particle mixture according to claim 17 wherein said outer body includes: an outer sheath surrounding said nozzle liner, and an inner sheath between said nozzle liner and said outer sheath to provide an impact resistant layer.