System for injecting particulate material into the combustion chamber of a repetitive combustion coating apparatus

• US 3,967,761 A
• Filed: 11/04/1974
• Issued: 07/06/1976
• Est. Priority Date: 04/08/1974
• Status: Expired due to Term

• Current Assignee: Southwest Research Institute
• Original Assignee: Southwest Research Institute
• Inventors: Hubbard, Elbert M., Melton, Rosser B. Jr.
• Primary Examiner(s): Knowles, Allen N.
• Assistant Examiner(s): Lane, Hadd
• Application Number:
  US05/520,670
• Time in Patent Office: 610 Days
• Field of Search: 222/194, 46/194, 46/195, 224/11, 221/25, 141/67
• US Class Current: 222/635
• CPC Class Codes: B05B 7/0006 Spraying by means of explosions
• CPC Class Codes: C23C 4/129 Flame spraying

Abstract

A repetitive combustion system for coating a work piece with particulate material is disclosed which utilizes an encapsulating tape having a plurality of discrete capsules each containing a predetermined quantity of the particulate coating material. The capsules are sequentially fed into a stripping chamber where the tape is clamped between inlet and outlet manifolds which provide a circumferential seal around the respective capsules so that pressure can be applied to an inlet face of the capsule. The inlet face is so configured as to admit air into the interior of the capsule which then swells and bursts the outlet face or otherwise passes through the outlet faces. The air pressure then injects the particulate material into the combustion chamber while the pressure in the combustion chamber is near the peak produced by combustion. A number of different tape configurations are disclosed and also a number of different stripping stations designed to enhance scavenging of all of the particulate material from the capsules without entraining any of the material forming the capsules and to position the capsules to the station at a high rate. The coating apparatus includes a sequencing means which feeds the tape at a continuous rate through the stripping station and initiates introduction of a fuel-air mixture to the combustion chamber, ignition of the fuel-air mixture, and injection of the particulate material from the stripping station in the proper sequence. High speed rotary manifold systems for positioning these capsules at the stripping station are also disclosed.

Claims

1. A system for injecting predetermined quantities of particulate coating material into a chamber from an elongated tape forming a plurality of discrete tubular capsules each encapsulating a predetermined quantity of particulate coating material, each capsule having an inlet face and an outlet face at opposite ends of the tubular capsule, said system comprising:

means for forming a seal around the tubular capsule to seal the inlet face from the outlet face,

inlet manifold means including valve means for applying a pneumatic pulse to the inlet face, said inlet manifold means being separable from said means for forming a seal around the tubular capsule, and

outlet manifold means including an outlet port communicating with the outlet face of the capsule and the chamber wherein the particulate coating material can be co-mingled with a hot gas to heat and accelerate it against a work piece.

2. The system of claim 1 wherein the means for forming the seal around the tubular capsule comprises a means forming a pair of separable complimentary chambers conforming to the contour of the tubular portion of the capsule.

3. The system of claim 2 wherein at least one of the separable complimentary chambers is formed in the rim of a rotating wheel including a plurality of such chambers spaced around the periphery of the rim and sequentially rotating into mating position with the complimentary chamber.

4. A system for injecting predetermined quantities of particulate coating material into a chamber from an elongated tape forming a plurality of discrete tubular capsules each encapsulating a predetermined quantity of particulate coating material, each capsule having an inlet face and an outlet face at opposite ends of the tubular capsule, said system comprising:

means for forming a seal around the tubular capsule to seal the inlet face from the outlet face comprising a means forming a pair of separable complimentary chambers conforming to the contour of the tubular portion of the capsule, and wherein at least one of the separable complimentary chambers is formed in the rim of a rotating wheel including a plurality of such chambers spaced around the periphery of the rim and sequentially rotating into mating position with the complimentary chamber,

inlet manifold means including valve means for applying a pneumatic pulse to the inlet face, and

outlet manifold means including an outlet port communicating with the outlet face of the capsule and the combustion chamber.

5. A system for injecting predetermined quantities of particulate coating material into a chamber from an elongated tape forming a plurality of discrete tubular capsules each encapsulating a predetermined quantity of particulate coating material, each capsule having an inlet face and an outlet face at opposite ends of the tubular capsule, said system comprising:

means for forming a seal around the tubular capsule to seal the inlet face from the outlet face,

inlet manifold means including valve means for applying a pneumatic pulse to the inlet face, and

outlet manifold means including an outlet port communicating with the outlet face of the capsule and the chamber wherein the particulate coating material can be co-mingled with a hot gas to heat and accelerate it against a work piece.

6. The system of claim 5 wherein the means for forming the seal around the tubular capsule comprises a means forming a pair of separable complimentary chambers conforming to the contour of the tubular portion of the capsule.

7. The system of claim 6 wherein at least one of the separable complimentary chambers is formed in the rim of a rotating wheel including a plurality of such chambers spaced around the periphery of the rim and sequentially rotating into mating position with the complimentary chamber.