PNEUMATIC DEFLECTOR FOR ABRASIVE MEDIA BLASTING NOZZLE
Publication Date: 2005-Oct-12
The IP.com Prior Art Database
The publication relates generally to an abrasive media-blasting nozzle, and more particularly to a nozzle for pneumatically deflecting a low pressure fed abrasive media with a high pressure fluid jet discrete fed to the nozzle.
Pneumatic deflector FOR ABRASIVE MEDIA BLASTING NOZZLE
The present invention relates generally to an abrasive media-blasting nozzle, and more particularly to a nozzle for pneumatically deflecting a low pressure fed abrasive media with a high pressure fluid jet discrete fed to the nozzle.
BACKGROUND OF THE INVENTION
The present invention addressed the problem associated with deflecting nozzles used with a sandblasting system to clean surfaces of a workpiece or other object. Sand, or another equivalent abrasive particle media, projection systems operate at high pressure and often use solid deflecting nozzles to redirect inaccessible areas of a workpiece, such as the inner surface of an annular gas turbine engine part for example. The solid deflects of the prior art presently used to redirect the abrasive media, as shown in Fig. 1, cause the media to slow down upon and deteriorate prior to impact with the surface of the workpiece to be cleaned, which reduces the abrasive capabilities of the media. Additionally, the gradual wear that the abrasive media produces on nozzle tip as a result of redirection, as seen in Fig. 2, can cause the workpiece to become contaminated by metal particles worn away from the nozzle itself. Once the solid deflecting nozzle has become eroded, the concentration and accuracy of the high pressure sand-infused air jet which comes out of the deflecting nozzle is then negatively affected. The high pressure abrasive media also tends to deteriorate the media piping system.
BRIEF DESCRIPTION OF THE DRAWINGS
Figs. 1 is a cross-sectional view of a sand-blasting nozzle of the prior art.
Fig. 2 is the sand-blasting nozzle of Fig. 1 after prolonged use, showing the erosion of the solid deflector.
Fig. 3 is a cross-sectional view of a dry-blast, pneumatic particle deflecting nozzle according to the present invention.
Fig. 4 is a perspective view of the nozzle of Fig. 3.
Fig. 5 is a photographic view of the system.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to Fig. 3, the pneumatic deflecting nozzle 10 preferably comprises two discrete passages integrally formed therein: a media passage 12 and a high pressure jet passage 14.
The media passage 12 is preferably larger than the high pressure passage 14, and accommodates the flow of abrasive media particles 16 to the nozzle tip 18. The media passage 12 provides a straight-through flow of abrasive particles through the nozzle 10. Therefore, no inner surface of the nozzle substantially projects into the path of the abrasive particles in order to deflect their flow, thereby preventing any excessive erosion of the nozzle tip. The abrasive media particles are displaced through the passage 12 to the media passage outlet 20, by a fluid under a very low pressure. In a preferred embodiment air pressure at approximately 3psi is used to feed sand particles through the media passage 12. While p...