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A hybrid atomizing fuel nozzle includes a stem with primary and secondary fuel circuits. A nozzle assembly fixed at the downstream end of the stem includes primary and secondary nozzle portions. A shroud and swirler assembly surrounds the nozzle assembly, and includes an annular body with a prefilme

A hybrid atomizing fuel nozzle includes a stem with primary and secondary fuel circuits. A nozzle assembly fixed at the downstream end of the stem includes primary and secondary nozzle portions. A shroud and swirler assembly surrounds the nozzle assembly, and includes an annular body with a prefilmer surface. A radial inflow swirler in the annular body directs a first swirling air flow radially inward toward the secondary nozzle portion. An outer air swirler disposed in surrounding relation to the annular body provides a converging second swirling air flow downstream of the prefilmer surface. Discrete fuel passages direct fuel streams outward and downstream toward and against the prefilmer surface. The fuel passes through the first air flow and is evenly distributed across the prefilmer surface in a thin continuous sheet. The first and second air flows then cause the sheet to form a conical spray of atomized fuel.

대표청구항 ▼

A hybrid atomizing fuel nozzle includes a stem with primary and secondary fuel circuits. A nozzle assembly fixed at the downstream end of the stem includes primary and secondary nozzle portions. A shroud and swirler assembly surrounds the nozzle assembly, and includes an annular body with a prefilme

A hybrid atomizing fuel nozzle includes a stem with primary and secondary fuel circuits. A nozzle assembly fixed at the downstream end of the stem includes primary and secondary nozzle portions. A shroud and swirler assembly surrounds the nozzle assembly, and includes an annular body with a prefilmer surface. A radial inflow swirler in the annular body directs a first swirling air flow radially inward toward the secondary nozzle portion. An outer air swirler disposed in surrounding relation to the annular body provides a converging second swirling air flow downstream of the prefilmer surface. Discrete fuel passages direct fuel streams outward and downstream toward and against the prefilmer surface. The fuel passes through the first air flow and is evenly distributed across the prefilmer surface in a thin continuous sheet. The first and second air flows then cause the sheet to form a conical spray of atomized fuel. 1. A foam spraying apparatus for a liquid container comprising: (a) a first piston-and-cylinder unit for air, comprising a first cylinder and a first piston, the first unit having an inlet valve and an outlet valve; (b) a second piston-and-cylinder unit for liquid, comprising a second cylinder and a second piston, the second unit having an inlet valve and an outlet valve and cooperating with the first unit by a mutual coupling; (c) a mixing chamber for mixing air and liquid; and (d) a spraying head provided with a foam delivery opening, wherein the first cylinder and the second piston are interconnected to form an intermediate part and the second cylinder and the first piston are interconnected to form a base part, and wherein the intermediate part and the base part mesh and are moveable relative to each other. 2. The foam spraying apparatus according to claim 1, wherein the second piston is laid out eccentrically with respect to the first cylinder. 3. The foam spraying apparatus according to claim 1, wherein the first piston and second piston each are provided with a sealing ring. 4. The foam spraying apparatus according to claim 1, wherein the mixing chamber is formed by an insert between the spraying head and the intermediate part. 5. The foam spraying apparatus according to claim 4, wherein the mixing chamber is provided with a tapered inlet opening for the air and a tapered inlet for the liquid. 6. The foam spraying apparatus according to claim 5, wherein, seen in the flow direction, after the air inlet opening and the liquid inlet opening a first fine mesh sieve is arranged. 7. The foam spraying apparatus according to claim 6, wherein, seen in the flow direction, after the first sieve a foaming chamber and a second fine mesh sieve are arranged. 8. The foam spraying apparatus according to claim 1, wherein the spraying head, the insert, the intermediate part and the base part are made from a synthetic material formed by an injection moulding process. 9. A method of manufacturing a foam spraying apparatus according to claim 1, wherein the spraying head, the first piston and first cylinder of the first unit for the air and the second piston and second cylinder of the second unit for the liquid are injection moulded using a two component synthetic material. 10. A method according to claim 9, wherein the inlet and outlet valves of the first unit and second unit are made from a rubber elastic synthetic material and during injection moulding are surrounded by the intermediate and base parts coordinated to them. 11. The foam spraying apparatus according to claim 1, wherein the first cylinder and the second piston form a unit body as the intermediate part and the first piston and the second cylinder form a unit body as the base part.