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Patent US3804564A successfully refreshed from Google Patents.
US3804564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Globoid-worm machines for varying the pressure of a fluid
Assignee: Individual
•
Filing: 1973-02-28
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Granted: 1974-04-16
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Expires: 1993-02-28
Abstract
Abstract The invention deals with a globoid-worm machine such as a compressor or expansion machine for varying the pressure of a fluid, which comprises a globoid worm having a plurality of threads in meshing relation with at least one transverse pinion and rotatably mounted within a stationary casing which is applied in leak-tight manner against at least part of the external surface of the worm and which has main ports for connecting the interior of said casing respectively to a fluid admission chamber and to a fluid discharge chamber. The casing is provided with a plurality of auxiliary ports which connect the interior of said casing to said discharge chamber and are fitted with movable means for leak-tight closure.
Inventors
- 👤 B Zimmern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:36
CPC Classifications
F; F04; F04C; F04C28/00; F04C28/10; F04C28/16; F04C28/24
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
115 words
A globoid-worm machine such as a compressor or expansion machine for varying the pressure of a fluid, which comprises a globoid worm having a plurality of threads in meshing relation with at least one transverse pinion and rotatably mounted within a stationary casing which is applied in leak-tight manner against at least part of the external surface of the worm and which has main ports for connecting the interior of said casing respectively to a fluid admission chamber and to a fluid discharge chamber, wherein the casing is provided with a plurality of auxiliary ports which connect the interior of said casing to said discharge chamber and are fitted with movable means for leak-tight closure.
Claim 2
Dependent Claim
115 words
A globoid-worm machine such as a compressor or expansion machine for varying the pressure of a fluid, which comprises a globoid worm having a plurality of threads in meshing relation with at least one transverse pinion and rotatably mounted within a stationary casing which is applied in leak-tight manner against at least part of the external surface of the worm and which has main ports for connecting the interior of said casing respectively to a fluid admission chamber and to a fluid discharge chamber, wherein the casing is provided with a plurality of auxiliary ports which connect the interior of said casing to said discharge chamber and are fitted with movable means for leak-tight closure.
Claim 3
Dependent Claim
33 words
A machine according to claim 1, wherein the line of intersection of the auxiliary ports with the internal face of the casing is substantially inscribed within the crest surface of the worm threads.
Claim 4
Dependent Claim
39 words
A machine according to claim 2, wherein the auxiliary ports open into the interior of the casing in the vicinity of the discharge side in that zone in which the worm threads have a crest surface of maximum width.
Claim 5
Dependent Claim
56 words
A machine according to claim 1, wherein the means for closing-off the auxiliary ports are valves actuated as a result of the difference between the pressure existing within the chambers delimited by adjacent threads of the worm and the pressure existing within the discharge chamber, said valves being subjected to the action of ancillary restoring means.
Claim 6
Dependent Claim
34 words
A machine according to claim 4 and intended to operate as a compressor, wherein the valves are arranged so as to be maintained in the closed position by the pressure of the discharge chamber.
Claim 7
Dependent Claim
42 words
A machine according to claim 4 and intended to operate as an expansion machine, wherein the valves are arranged so as to be maintained in the closed position by the pressure of the expansion chambers which are delimited by the worm threads.
Claim 8
Dependent Claim
13 words
A machine according to claim 4, wherein the ancillary restoring means are springs.
Claim 9
Dependent Claim
45 words
A machine according to claim 4, wherein the residual volume comprised between the internal face of the casing and the end face of a valve is smaller than twenty per cent of the volume of a chamber which is delimited by two adjacent worm threads.
Claim 10
Dependent Claim
36 words
A machine according to claim 4, wherein the end face of the valve is brought level with the internal face of the casing in the closed position and has the same profile as said internal face.
Claim 11
Dependent Claim
42 words
A machine according to claim 1, wherein the discharge ports and the auxiliary ports are spaced around the periphery of the internal face of the casing at angular intervals substantially equal to the angular intervals between the threads of the globoid worm.
Claim 12
Dependent Claim
37 words
A machine according to claim 1, wherein the discharge chamber is connected to a utilization pipe fitted with a check valve and to an auxiliary pipe which is connected to the admission chamber through a controlled valve.
Claim 13
Dependent Claim
37 words
A machine according to claim 11, and comprising means for injecting a sealing liquid in the vicinity of the pinions, wherein said machine comprises means for stopping the injection of liquid and simultaneously opening the controlled valve.
References Cited (Backward Citations)
US3133695A
Cited
US3752606A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-15 | 1977-10-15 | 1978-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-15 | 1981-10-15 | 1982-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-15 | 1985-10-15 | 1986-04-16 | $7700.00 | Window Closed / Lapsed |