US3583633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods and devices for producing jets by free expansion of a gas
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1969-05-06
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Granted: 1971-06-08
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Expires: 1989-05-06
Abstract
Abstract A method and device for producing jets or beams of particles by expansion of a gas through an orifice having a small crosssectional area from a first chamber in which is maintained a pressure Po into a second chamber in which is maintained a pressure P1. The method essentially consists both in maintaining the pressure P1 equal to a value between 10 2 and 10 torr and in selecting the distance b between the expansion orifice and the inlet of a divertor as a function of the diameter Do of said orifice in order that the intensity of the jet which is produced should be of maximum value and particularly in selecting a sufficiently high value of pressure Po to ensure that the optimum value of the ratio b/D0 as defined above is higher than 100:1.
Inventors
- 👤 Roger Campargue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 04:05
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/24
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
90 words
A device for the production of jets of particles comprising a chamber, means for feeding a gas at a pressure P0 into a convergent nozzle having a discharge orifice which opens into said chamber, means for maintaining said chamber at a pressure P1 below P0, a divertor having a divergent discharge opening in the centerline of said nozzle, the distance b between the orifice of said nozzle and the inlet of said divertor being at least 100 times greater than the diameter D0 of said discharge orifice of said nozzle.
Claim 2
Independent Claim
90 words
A device for the production of jets of particles comprising a chamber, means for feeding a gas at a pressure P0 into a convergent nozzle having a discharge orifice which opens into said chamber, means for maintaining said chamber at a pressure P1 below P0, a divertor having a divergent discharge opening in the centerline of said nozzle, the distance b between the orifice of said nozzle and the inlet of said divertor being at least 100 times greater than the diameter D0 of said discharge orifice of said nozzle.
Claim 3
Dependent Claim
27 words
A device in accordance with claim 1, wherein the angle at the summit of said nozzle is smaller than the angle at the summit of the divertor.
Claim 4
Dependent Claim
29 words
A device in accordance with claim 1, wherein said divertor is conical and the angle at the internal summit of said divertor is equal to 50* at a maximum.
Claim 5
Dependent Claim
34 words
A device in accordance with claim 1, wherein said divertor is conical and the difference between the angles at the external and internal summits of said divertor is equal to 10* at a maximum.
Claim 6
Dependent Claim
16 words
A device in accordance with claim 1, wherein said pressure P0 is higher than 104 torr.
Claim 7
Dependent Claim
29 words
A device in accordance with claim 1, wherein the gas employed is a relatively heavy gas diluted in a light gas in a proportion of a few units percent.
Claim 8
Dependent Claim
18 words
A device in accordance with claim 6, wherein at least the major part of the gas is helium.
Claim 9
Dependent Claim
73 words
A device as described in claim 1, for the production of jets of a noncondensed gas having a ratio between specific heat values at constant pressure and constant volume substantially equal to 1.4, the distance b, the diameter D0, the pressures P0 and P1 and the Knudsen number kn0 of the gas at the pressure P0 prior to the expansion of said gas within said chamber being defined by the relation: b/D0 0(1kn0.P0/P1)1/3
Claim 10
Dependent Claim
40 words
A device as described in claim 1, including a second chamber, said first divertor opening into said second chamber, a second divertor in said chamber, said second divertor having a divergent discharge opening located on the centerline of said nozzle.
Claim 11
Dependent Claim
36 words
A device in accordance with claim 9, wherein said second divertor is conical and the difference between the angles at the external and internal summits of said second divertor is equal to 10* at a maximum.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |