EP0110529A2
Expired / Lapsed
EP
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High velocity fluid abrasive jet
Assignee: Flow Industries Inc
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Filing: 1983-10-13
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Granted: —
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Expires: 2003-10-13
Abstract
Abstract In method and apparatus for producing a coherent stream of high velocity abrasive laden liquid, the method includes allowing particles of abrasive to assume the direction and velocity of a high velocity jet (22) of liquid. The method allows concentration of particles in the centre of the flow of liquid to reduce nozzle wear and increase cutting efficiency. The apparatus includes a nozzle (21) having a converging section (26, 27) attached to a straight section (28) that is sufficiently large that the abrasive particles approach the velocity of the fluid jet before leaving the exit (29) of the nozzle.
Inventors
- 👤 Mohammed A. Hashish
- 👤 Yih-Ho Pao
- 👤 Michael J. Kirby
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 15:34
CPC Classifications
B; B24; B24C; B24C5/00; B24C5/02; B24C5/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
60 words
A method of producing an abrasive laden jet of high velocity liquid comprising the steps of:- generating (61) a jet of high velocity liquid; introducing (62) particles of abrasive into the jet; orienting (63) the velocity vector of the particles to that of the jet; and accelerating (64) the particles to a speed at least approaching that of the jet.
Claim 2
Independent Claim
60 words
A method of producing an abrasive laden jet of high velocity liquid comprising the steps of:- generating (61) a jet of high velocity liquid; introducing (62) particles of abrasive into the jet; orienting (63) the velocity vector of the particles to that of the jet; and accelerating (64) the particles to a speed at least approaching that of the jet.
Claim 3
Dependent Claim
22 words
A method according to claim 1 wherein the particles (10) are accelerated to at least 80% of the velocity of the jet.
Claim 4
Dependent Claim
18 words
A method according to claim 1 comprising concentrating the particles (10) at the centre of the jet (22).
Claim 5
Dependent Claim
37 words
A method according to claim 3 wherein the concentration is accomplished by allowing the jet to contact a wall (28) to produce a velocity gradient providing an area of reduced velocity in the area of the wall.
Claim 6
Independent Claim
45 words
A method according to any preceding claim wherein the orientation is accomplished by introducing the jet (22) with abrasive particles (10) into a converging section (9) of a nozzle (11); and allowing the particles to assume the vector velocity of the jet in the nozzle.
Claim 7
Independent Claim
48 words
A method according to any preceding claim wherein the acceleration is accomplished introducing the oriented abrasive particle laden stream into a straight section (28) of a nozzle (21); and allowing the particles to accelerate to a speed at least approaching that of the jet before leaving the nozzle.
Claim 8
Independent Claim
99 words
An apparatus for producing a jet of abrasive laden liquid comprising:- jet means (36, 37) for producing a jet of high velocity fluid; inlet means (42) for introducing particles of abrasive; mixing means (43) attached to the jet means and the inlet means for mixing the jet of high velocity fluid and the particles of abrasive; orientation means connected to the mixing means for orienting the velocity vectors of the particles of abrasive; and acceleration means connected to the orienting means for accelerating the particles of abrasive to a velocity approaching that of the jet of high velocity fluid.
Claim 9
Independent Claim
99 words
An apparatus for producing a jet of abrasive laden liquid comprising:- jet means (36, 37) for producing a jet of high velocity fluid; inlet means (42) for introducing particles of abrasive; mixing means (43) attached to the jet means and the inlet means for mixing the jet of high velocity fluid and the particles of abrasive; orientation means connected to the mixing means for orienting the velocity vectors of the particles of abrasive; and acceleration means connected to the orienting means for accelerating the particles of abrasive to a velocity approaching that of the jet of high velocity fluid.
Claim 10
Dependent Claim
23 words
An apparatus according to claim 7 wherein the mixing and acceleration means comprises a nozzle having a converging section and a straight section.
Claim 11
Dependent Claim
23 words
An apparatus according to claim 8 wherein the length of the straight section of the nozzle is at least 20 times its diameter.
Claim 12
Dependent Claim
21 words
An apparatus according to claim 9 wherein the diameter of the straight section is between 20 and 100 times its length.
Claim 13
Dependent Claim
23 words
An apparatus according to claim 8 wherein the diameter of the straight section is at least 1.1 times the diameter of the jet.
Claim 14
Dependent Claim
24 words
An apparatus according to claim 11 wherein the diameter of the straight section is between 1.1 and 10 times the diameter of the jet.
Claim 15
Dependent Claim
26 words
An apparatus according to claim 8 wherein the diameter of the straight section is at least 1.1 times the diameter of the largest of the particles.
Claim 16
Dependent Claim
55 words
A nozzle for use in an abrasive particle liquid cutting jet apparatus comprising a converging section (26, 27) for producing an area of low pressure at the inlet; and a straight section (28) for accelerating the velocity of particles in liquid wherein the straight section is at least 20 times as long as its diameter.
Claim 17
Dependent Claim
55 words
A nozzle for use in an abrasive particle liquid cutting jet apparatus comprising a converging section (26, 27) for producing an area of low pressure at the inlet; and a straight section (28) for accelerating the velocity of particles in liquid wherein the straight section is at least 20 times as long as its diameter.
Claim 18
Dependent Claim
21 words
A nozzle according to claim 14 wherein the straight section is between 20 and 100 times as long as its diameter.
References Cited (Backward Citations)
No citation records indexed.
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