Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1986-06-30
1988-09-20
Schmidt, Frederick R.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51427, B24C 504
Patent
active
047715804
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to spraying devices, and more particularly to spraying devices for use in sand blasting.
One problem of sand blasting using dry sand is the production of dust or an aerosol of a solid phase dispersed in a gaseous phase, during the sand blasting operation, which creates a health hazard or problem, such as for example silicosis, amongst the operator or people in the vicinity of the operation. On the other hand, if wet sand is used in the sand blasting operation in order to overcome the dust problem, the efficiency of the operation may be considerably reduced, in some instances by up to 25-40%.
According to the present invention there is provided a device for spraying particulate material, comprising a nozzle having an inlet for receiving particulate material under pressure and an outlet for discharging the material, a housing surrounding at least the outlet portion of the nozzle, passage means defined between the housing and the nozzle, said passage means having an inlet to receive a wet fluid under pressure and said passage means terminating in an annular outlet zone surrounding the outlet portion of the nozzle whereby the particulate material discharged from the nozzle is surrounded by an annular stream of fluid discharged from the passage means.
When the device is used for sand blasting, the sand discharged from the nozzle is surrounded by the stream of wet fluid, the sand and the fluid becoming intermixed when contacting the substrate being blasted.
The wet fluid may be fresh water, salt water, or wet steam.
An embodiment of the invention will now be described by way of example only with reference to the accompanying drawings in which:
FIG. 1 is a longitudinal section of a preferred embodiment of the spraying device in accordance with the present invention;
FIG. 2 is a longitudinal section of a housing of the spraying device; and
FIG. 3 is an end elevation of the housing.
As shown in the drawings, the spraying device generally denoted by 2 comprises an inlet elbow 4 for admitting water or other wet fluid under pressure into the device 2, terminating in a socket 6 for receiving a tubular housing 8 and a sand blasting nozzle 10 which are both secured to the socket 6 by a securing nut 12.
Elbow 4 is connected at an inlet end 14 to a pump (not shown) such as a high pressure water pump capable of delivering water at a pressure of up to 16,000 p.s.i. However, a more typical low pressure range is 25 to 50 p.s.i, while a typical mid-range of pressure is about 250 to 2000 p.s.i. Optionally, the water may contain additives, such as for example, rust inhibitor known by the name "Polyphosphate" in an amount of typically 0.2%. Elbow 4 may take any convenient form as desired. The socket 6, located at the outlet end of elbow 4, is provided at its forwardly facing end with an annular stop ring 16 which abuts against a shoulder 17 on the external surface of the housing 8. At its rearward end, the socket 6 is provided with an internally threaded portion 18 which engages a threaded portion 20 of the securing nut 12, so that the nut 12, when tightened, maintains the housing 8 and nozzle 10 securely in place during operation of the spraying device. Socket 6 is welded to, or integrally made with, elbow 4 in order to withstand the high pressure of water being pumped into the spraying assembly.
The housing 8 is, in the form shown, a cylindrical tube having a grooved bore. The outer surface of the tube comprises a first annular groove which receives an "O" ring 22, and a second annular groove which receives an "O" ring 24, the "O" rings serving to seal the housing 8 within the bore of socket 6 so as to prevent leakage of water under pressure. An annular chamber 26 is located intermediate the two annular grooves so as to receive water from elbow 4 and distribute it substantially evenly around the circumference of the housing 8. Ports 28 are equally spaced circumferentially around the annular chamber 26 to permit passage of water from the chamber 26 to internally of the housing 8. Typically, the ports
REFERENCES:
patent: 2114573 (1938-04-01), Rhodes
patent: 2376287 (1945-05-01), Sorrentino
patent: 2379432 (1945-07-01), Heany
patent: 2440334 (1948-04-01), Gerlach
patent: 2669809 (1954-02-01), McGrath
patent: 2717476 (1955-09-01), Myers
Hardblast Australia Pty. Ltd.
Rose Robert A.
Schmidt Frederick R.
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