US3872665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater pulse jet motor
Assignee: LE MOTEUR MODERNE
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Filing: 1974-01-22
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Granted: 1975-03-25
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Expires: 1994-01-22
Abstract
Abstract An underwater pulse jet motor comprises a stator and, within the stator, a rotor which has axially extending ducts at its periphery. The stator includes a closing segment which closes off the forward ends of the ducts successively as they pass it during rotation of the rotor. Gas under pressure is injected into the ducts through an injection passage formed in the stator in alignment with the closing segment, injection openings in the ducts coming successively into register with the injection passage for this purpose. In order to form a buffer of water in each duct between the closing segment and the injection opening, the opening is disposed downstream of the upstream end of the duct, and an efficient seal against the escape of the gas between the upstream ends of the ducts and the closing segment is thus achieved. The buffer water can be arranged to flow at a restricted rate downstream into the central passage to provide an ejector effect to increase the water flow through the central passage at low forward speeds of the motor.
Inventors
- 👤 Philippe Jarry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:26
CPC Classifications
B; B63; B63H; B63H11/00; B63H11/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
156 words
An underwater pulse jet motor comprising a stator, a rotor mounted for rotation within the stator and provided at its periphery with longitudinally extending ducts having open upstream and downstream ends, a closing segment fixed with respect to the stator and closing off the upstream ends of said ducts successively during rotation of the rotor, a stator providing an injection orifice at the location of said segment, a pressurised gas source for supplying pressurised gas to the injection orifice, each of the ducts in the rotor having an injection aperture which comes into register with the said injection orifice when the upstream end of the said duct is closed off by the closing segment, said injection orifice and injection openings being disposed downstream of the upstream ends of the ducts whereby when the pressurised gas is supplied into the injection openings a buffer of pressurised water is formed between the closing segment and the injection openings.
Claim 2
Dependent Claim
156 words
An underwater pulse jet motor comprising a stator, a rotor mounted for rotation within the stator and provided at its periphery with longitudinally extending ducts having open upstream and downstream ends, a closing segment fixed with respect to the stator and closing off the upstream ends of said ducts successively during rotation of the rotor, a stator providing an injection orifice at the location of said segment, a pressurised gas source for supplying pressurised gas to the injection orifice, each of the ducts in the rotor having an injection aperture which comes into register with the said injection orifice when the upstream end of the said duct is closed off by the closing segment, said injection orifice and injection openings being disposed downstream of the upstream ends of the ducts whereby when the pressurised gas is supplied into the injection openings a buffer of pressurised water is formed between the closing segment and the injection openings.
Claim 3
Dependent Claim
85 words
A motor as claimed in claim 1, wherein the rotor is annular to provide a centraL passage open for the flow of water therethrough, at least one ejector passage being provided for placing the location between the closing segment and the injection openings of each duct in communication with said central passage, at least when the injection orifice registers with the injection opening of the said duct, the end of said ejector passage which opens to the central passage being directed in a downstream direction.
Claim 4
Dependent Claim
20 words
A motor as claimed in claim 2, wherein a plurality of said ejector passages are formed in the closing segment.
Claim 5
Dependent Claim
27 words
A motor as claimed in claim 3, wherein said downstream ends of the ejector passages are directed at an angle to a direction radially of the rotor.
Claim 6
Dependent Claim
25 words
A motor as claimed in claim 2, wherein the rotor is formed with a plurality of said ejector passages one in each of said ducts.
Claim 7
Dependent Claim
29 words
A motor as claimed in claim 5, wherein said downstream ends of the ejector passages are all directed at a common angle to a direction radially of the rotor.
Claim 8
Dependent Claim
48 words
A motor as claimed in claim 1, wherein the rotor is annular and provides a central passage therethrough, the rotor having radially inner and outer walls which define the radially inner and outer boundaries of the ducts, the downstream end portions of said inner wall being cut away.
Claim 9
Dependent Claim
62 words
A motor as claimed in claim 7, wherein the stator provides a fixed part-annular wall in the downstream end portion of said central passage, said part-annular wall being aligned axially with said inner wall of the rotor and aligned circumferentially with the closing segment, and the upstream end of the part-annular wall being disposed adjacent the downstream end of the inner wall.
Claim 10
Dependent Claim
18 words
A motor as claimed in claim 1, wherein said pressurised gas source comprises a generator of superheated steam.
Claim 11
Dependent Claim
46 words
A motor as claimed in claim 9, further comprising a feed pump connected to supply water to said generator, and a passage which is formed in the closing segment and through which water from the upstream ends of the ducts can be fed to the pump.
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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |