Producing directed spray

• US 4,681,258 A
• Filed: 06/09/1986
• Issued: 07/21/1987
• Est. Priority Date: 04/25/1983
• Status: Expired due to Fees

• Current Assignee: British Technology Group Ltd.
• Original Assignee: National Research Development Corporation
• Inventors: Jenkins, Walter N., Davies, Gordon I.
• Primary Examiner(s): Kashnikow, Andres
• Assistant Examiner(s): Jones, Mary Beth O.
• Application Number:
  US06/871,923
• Time in Patent Office: 407 Days
• Field of Search: 239/66, 239/79-85, 239/290, 239/292, 239/297, 239/298, 239/422, 239/563, 239/151, 219/76.16, 219/121 PL, 219/121 PY, 137/624.13, 137/625.31
• US Class Current: 239/66
• CPC Class Codes: B05B 12/02 for controlling time, or sequence, of delivery
• CPC Class Codes: B05B 7/0861 with one single jet constituted by a liquid or a mixture containing a liquid and several gas jets B05B7/0815 takes precedence
• CPC Class Codes: B05B 7/1606 the spraying of the material involving the use of an atomising fluid, e.g. air B05B7/168, B05B7/1686, B05B7/20, B05B7/22 take precedence
• CPC Class Codes: B05B 7/222 using an arc
• CPC Class Codes: B05B 7/224 the material having originally the shape of a wire, rod or the like
• CPC Class Codes: B22F 2998/00 Supplementary information concerning processes or compositions relating to powder metallurgy
• CPC Class Codes: B22F 3/115 by spraying molten metal, i.e. spray sintering, spray casting
• CPC Class Codes: B22F 9/082 atomising using a fluid using centrifugal force B22F9/10
• CPC Class Codes: C23C 4/123 Spraying molten metal
• CPC Class Codes: Y10T 137/86405 Repeating cycle
• CPC Class Codes: Y10T 137/86743 Rotary

Abstract

For uniformly coating a substrate with a spray, a stream of liquid falls past a point towards which a plurality of nozzles in a bank are all directed but at different angles. Bursts of atomising gas are sprayed through the respective nozzles in a repeated sequence, such as to cause a repeated sequence of equal durations of spray in a plurality of directions.

Claims

1. An arrangement for evenly coating a surface with a spray, comprising means for forming an unsupported supply path of liquid, a gas supply, a plurality of atomizing gas nozzles each disposed at a different location and all directed at the same point, being a point in the supply path along which the liquid will flow, control means between the gas supply and said nozzles for imparting a varying direction to the spray, the control means repetitiously varying the flow of gas through the nozzles in a predetermined sequence of at least three flow patterns said patterns being associated with an arrangement of said nozzles, said arrangement comprising respectively at least one pair of said nozzles for each said pattern, each nozzle of a pair being disposed in mirror image to the other nozzle of the pair about a fixed vertical mirror plane including the supply path, the said control means comprising, facing said gas supply, a continuously driven rotating disc, and, in sliding contact with said rotating disc, a static aperture timer disc, said rotating disc having windows which register in sequence with respective apertures in said timer disc, said apertures feeding respective said nozzles.

2. The arrangement as claimed in claim 1, wherein the means for forming the unsupported supply of liquid is a vessel with an orifice.

3. The arrangement as claimed in claim 1, wherein the means for forming the unsupported supply of liquid is a consumable electrode connected to an arc generator.

4. The arrangement as claimed in claim 1, wherein said windows are distributed over at least two concentric circles of different radii and each of which registers in sequence with a respective one of said apertrues in said timer disc.

5. The arrangement as claimed in claim 4, wherein said windows comprise elongated slots formed in said rotating disc with said slots being located at different radii.