US3561677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic air-liquid atomizing nozzle for paints and the like
Assignee: WS ROCKWELL COMPANY 200 ELIOT STREET FAIRFIELD CT A CORP OF NJ
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Filing: 1967-07-07
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Granted: 1971-02-09
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Expires: 1987-07-07
Abstract
Abstract The invention is directed to air-liquid atomizing nozzles, particularly for electrostatic paint spray systems. The nozzle of the invention is characterized by having an annular liquid discharge opening closely surrounded by an annular air discharge opening. The arrangement of the air discharge opening is such that the air, while being discharged in a generally cylindrical flow, is caused and permitted immediately to contract in diameter in front of the nozzle, and thereafter to gradually expand in diameter to form a desired paint spray pattern.
Inventors
- 👤 Edward O Norris
- 👤 Hereward Wake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:37
CPC Classifications
B; B05; B05B; B05B5/00; B05B5/025; B05B5/03; B05B7/00; B05B7/02; B05B7/06; B05B7/062; B05B7/066; B05B7/067
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
310 words
An atomizing nozzle for air and coating liquid, which comprises: a. a nozzle tube; b. a nozzle ring surrounding said nozzle tube and forming therewith an air passage for the forward flow of air under pressure; c. air supply means connected to said air passage; d. opposed and cooperating surface means on said nozzle ring and tube forming an annular air discharge opening; e. said opposed and cooperating surface means comprising concentric, cylindrical surface portions of the nozzle tube and nozzle ring coaxial with the longitudinal axis of the nozzle tube; f. said air discharge opening being of very large diameter in relation to the width of the opening and constituting a constriction relative to the air supply passage, to enable the discharge at high velocity of a circular air stream; g. said nozzle tube terminating at its forward end in an annular valve seat; h. a valve element slidably received within said nozzle tube and having an enlarged valve head arranged to close against said valve seat; i. said valve head and valve seat being controllably slidable to open and closed positions and defining, when in an open position, an annular liquid discharge opening; j. coating liquid supply means connected to said nozzle tube; k. said air supply means and said coating liquid supply means being so related to each other and to their respective discharge openings that the air is discharged at a significantly higher velocity than the coating liquid; and l. all portions of the nozzle which are located forward of the effective forward terminus of said nozzle ring and are contained within the envelope of the discharged circular air stream, being contained within a cylindrical envelope coaxial with the nozzle tube and of a diameter not greater than the effective outside diametral dimension of the nozzle tube at the transverse plane of said effective forward terminus.
Claim 2
Dependent Claim
310 words
An atomizing nozzle for air and coating liquid, which comprises: a. a nozzle tube; b. a nozzle ring surrounding said nozzle tube and forming therewith an air passage for the forward flow of air under pressure; c. air supply means connected to said air passage; d. opposed and cooperating surface means on said nozzle ring and tube forming an annular air discharge opening; e. said opposed and cooperating surface means comprising concentric, cylindrical surface portions of the nozzle tube and nozzle ring coaxial with the longitudinal axis of the nozzle tube; f. said air discharge opening being of very large diameter in relation to the width of the opening and constituting a constriction relative to the air supply passage, to enable the discharge at high velocity of a circular air stream; g. said nozzle tube terminating at its forward end in an annular valve seat; h. a valve element slidably received within said nozzle tube and having an enlarged valve head arranged to close against said valve seat; i. said valve head and valve seat being controllably slidable to open and closed positions and defining, when in an open position, an annular liquid discharge opening; j. coating liquid supply means connected to said nozzle tube; k. said air supply means and said coating liquid supply means being so related to each other and to their respective discharge openings that the air is discharged at a significantly higher velocity than the coating liquid; and l. all portions of the nozzle which are located forward of the effective forward terminus of said nozzle ring and are contained within the envelope of the discharged circular air stream, being contained within a cylindrical envelope coaxial with the nozzle tube and of a diameter not greater than the effective outside diametral dimension of the nozzle tube at the transverse plane of said effective forward terminus.
Claim 3
Dependent Claim
61 words
The atomizing nozzle of claim 1, further characterized by: a. said valve head having a deep recess in its forward face; b. said recess having divergent walls extending forward and outward to the outer extremities of the valve head; and c. said valve head thus being substantially completely free of flat frontal surface area in the region of its outer extremities.
Claim 4
Dependent Claim
101 words
The atomizing nozzle of claim 1, further characterized by: a. said air supply passage being of substantially larger flow passage area than said air discharge opening; b. said nozzle ring having a first cylindrical wall of an enlarged diameter, a second cylindrical wall of a reduced diameter forming the outer wall of the air discharge opening, and a converging wall joining said first and second cylindrical walls; and c. said nozzle tube having an annular portion of increased diameter having a cylindrical outer wall facing the second cylindrical wall of said nozzle ring and forming therewith a constricted air discharge opening.
Claim 5
Dependent Claim
58 words
The atomizing nozzle of claim 1, further characterized by: a. said nozzle tube having a radially projecting annular rib forming part of said annular air discharge opening; and b. said valve seat and valve head being located forward of said air discharge opening, a distance which is slightly greater than the distance of radial projection of said rib.
Claim 6
Dependent Claim
231 words
An atomizing nozzle for aIr and coating liquid, which comprises: a. a nozzle tube; b. a nozzle ring surrounding said nozzle tube and forming therewith an air supply passage for the forward flow of air under pressure; c. opposed and cooperating surface means on said nozzle ring and tube forming an annular air discharge opening; d. said air discharge opening being of very large diameter in relation to the width of the opening and constituting a constriction relative to the air supply passage, to enable the discharge at high velocity of a circular air stream; e. said nozzle tube terminating at its forward end in an annular valve seat; f. a valve element slidably received within said nozzle tube and having an enlarged valve head arranged to close against said valve seat; g. said valve head and valve seat being controllably slidable to open and closed positions and defining, when in an open position, an annular liquid discharge opening; h. all portions of the nozzle located forward of said air discharge opening and contained within the envelope of the discharged air stream being of equal or smaller diameter than the inner diametral dimension of the air discharge opening; i. said nozzle tube having an annular, radially outwardly projecting rib adjacent its forward end; and j. said rib having a cylindrical outer surface forming the inner surface of the air discharge opening.
Claim 7
Dependent Claim
231 words
An atomizing nozzle for aIr and coating liquid, which comprises: a. a nozzle tube; b. a nozzle ring surrounding said nozzle tube and forming therewith an air supply passage for the forward flow of air under pressure; c. opposed and cooperating surface means on said nozzle ring and tube forming an annular air discharge opening; d. said air discharge opening being of very large diameter in relation to the width of the opening and constituting a constriction relative to the air supply passage, to enable the discharge at high velocity of a circular air stream; e. said nozzle tube terminating at its forward end in an annular valve seat; f. a valve element slidably received within said nozzle tube and having an enlarged valve head arranged to close against said valve seat; g. said valve head and valve seat being controllably slidable to open and closed positions and defining, when in an open position, an annular liquid discharge opening; h. all portions of the nozzle located forward of said air discharge opening and contained within the envelope of the discharged air stream being of equal or smaller diameter than the inner diametral dimension of the air discharge opening; i. said nozzle tube having an annular, radially outwardly projecting rib adjacent its forward end; and j. said rib having a cylindrical outer surface forming the inner surface of the air discharge opening.
Claim 8
Dependent Claim
68 words
The atomizing nozzle of claim 5, further characterized by: a. said nozzle tube having an extension projecting forward from said annular rib and terminating in said valve seat; b. said valve head and said extension being of diameters, which are less than the outer diameter of said annular rib; and c. the diameter of said extension being at least as large as the diameter of said valve head.
Claim 9
Dependent Claim
273 words
An atomizing nozzle for air and coating liquid, which comprises: a. a nozzle tube; b. a nozzle ring surrounding said nozzle tube and forming therewith an air supply passage for the forward flow of air under pressure; c. opposed and cooperating surface means on said nozzle ring and tube forming an annular air discharge opening; d. said air discharge opening being of very large diameter in relation to the width of the opening and constituting a constriction relative to the air supply passage, to enable the discharge at high velocity of a circular air stream; e. said nozzle tube terminating at its forward end in an annular valve seat; f. a valve element slidably received within said nozzle tube and having an enlarged valve head arranged to close against said valve seat; g. said valve head and valve seat being controllably slidable to open and closed positions and defining, when in an open position, an annular liquid discharge opening; h. all portions of the nozzle located forward of said air discharge opening and contained within the envelope of the discharged air stream being of equal or smaller diameter than the inner diametral dimension of the air discharge opening; i. said valve head having a generally cylindrical outer surface; j. the front surface portion of said valve head having a forwardly divergent surface extending outward into intersecting relation with said cylindrical outer surface; k. said intersecting surfaces forming a forwardly facing, sharp annular edge over which air and liquid are caused to flow; and l. said valve head being formed of electrically conductive material and being connectable to a source of electric charging potential.
Claim 10
Dependent Claim
273 words
An atomizing nozzle for air and coating liquid, which comprises: a. a nozzle tube; b. a nozzle ring surrounding said nozzle tube and forming therewith an air supply passage for the forward flow of air under pressure; c. opposed and cooperating surface means on said nozzle ring and tube forming an annular air discharge opening; d. said air discharge opening being of very large diameter in relation to the width of the opening and constituting a constriction relative to the air supply passage, to enable the discharge at high velocity of a circular air stream; e. said nozzle tube terminating at its forward end in an annular valve seat; f. a valve element slidably received within said nozzle tube and having an enlarged valve head arranged to close against said valve seat; g. said valve head and valve seat being controllably slidable to open and closed positions and defining, when in an open position, an annular liquid discharge opening; h. all portions of the nozzle located forward of said air discharge opening and contained within the envelope of the discharged air stream being of equal or smaller diameter than the inner diametral dimension of the air discharge opening; i. said valve head having a generally cylindrical outer surface; j. the front surface portion of said valve head having a forwardly divergent surface extending outward into intersecting relation with said cylindrical outer surface; k. said intersecting surfaces forming a forwardly facing, sharp annular edge over which air and liquid are caused to flow; and l. said valve head being formed of electrically conductive material and being connectable to a source of electric charging potential.
Claim 11
Dependent Claim
58 words
The atomizing nozzle of claim 7, further characterized by: a. said forwardly divergent surface extending rearward for a substantial distance to form a deep recess in the front of said valve head; and b. the frontal surface area of said valve head, in the region of the cylindrical outer surface thereof, consisting exclusively of said sharp annular edge.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |