Patent US3804423A successfully refreshed from Google Patents.
US3804423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaft seal throttle bushing
Assignee: EIDP Inc
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Filing: 1971-11-16
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Granted: 1974-04-16
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Expires: 1991-11-16
Abstract
Abstract Method and apparatus for sealing a rotating drive shaft that enters a vessel for processing viscous material includes the steps of feeding a portion of the supply stream of viscous material into the vessel in one direction through a space formed between a bore in the vessel and the shaft while allowing a smaller portion of the material to flow through the space in the opposite direction to atmosphere as leakage. The processing equipment comprises a rotatably driven shaft and a vessel having a casing provided with both a passage for the introduction of the viscous material and a bore through which the shaft extends into the vessel. The bore has end and mid portions all larger in diameter than the shaft. The passage extends into the bore through the mid portion of the bore. One of the end portions leads into the vessel; the other end portion leads toward the outside of the vessel. The bore and the shaft form annular chamber means for providing a lower resistance to flow of the viscous material through the one end than through the other end portion of the bore.
Inventors
- 👤 M Booy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:14
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/44; F16J15/443; B; B29; B29C; B29C48/00; B29C48/25; B29C48/252; B29C48/254; B29C48/03
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
133 words
Processing equipment for viscous material comprised of a rotatably driven shaft and a vessel having a casing provided with both a passage for the introduction of a viscous material under higher pressure than in the vessel and a stepped bore through which the shaft extends into the vessel, said bore having end and mid steps with different inside diameters all larger than the shaft, there being clearance between the shaft and said steps, the inner end step having an inside diameter less than the mid step and greater than the outer end step, said passage extending into said bore through the mid step for introduction of said viscous material into said vessel past said inner step and for allowing a small portion of said viscous material to flow past said outer end step.
Claim 2
Dependent Claim
133 words
Processing equipment for viscous material comprised of a rotatably driven shaft and a vessel having a casing provided with both a passage for the introduction of a viscous material under higher pressure than in the vessel and a stepped bore through which the shaft extends into the vessel, said bore having end and mid steps with different inside diameters all larger than the shaft, there being clearance between the shaft and said steps, the inner end step having an inside diameter less than the mid step and greater than the outer end step, said passage extending into said bore through the mid step for introduction of said viscous material into said vessel past said inner step and for allowing a small portion of said viscous material to flow past said outer end step.
Claim 3
Dependent Claim
28 words
The processing equipment of claim 1, wherein said stepped bore is the inner surface of a sleeve and said casing has an opening adapted to receive the sleeve.
Claim 4
Dependent Claim
143 words
In processing equipment for viscous material including at least one rotatably driven shaft and a vessel with at least one passage for the introduction of viscous materials as well as an opening througH which the shaft extends from atmosphere into the vessel, a throttling sleeve on the shaft and keyed to the vessel in said opening, said sleeve having end and mid steps with different inside diameters all larger than the shaft to provide clearance between the shaft and the steps, the inner end step having an inside diameter less than the mid step and greater than the outer end step, said passage extending through said sleeve at the mid step for introduction of said viscous material into said vessel past said inner step and for allowing a small portion of said viscous material to flow past said outer end step to atmosphere.
Claim 5
Dependent Claim
143 words
In processing equipment for viscous material including at least one rotatably driven shaft and a vessel with at least one passage for the introduction of viscous materials as well as an opening througH which the shaft extends from atmosphere into the vessel, a throttling sleeve on the shaft and keyed to the vessel in said opening, said sleeve having end and mid steps with different inside diameters all larger than the shaft to provide clearance between the shaft and the steps, the inner end step having an inside diameter less than the mid step and greater than the outer end step, said passage extending through said sleeve at the mid step for introduction of said viscous material into said vessel past said inner step and for allowing a small portion of said viscous material to flow past said outer end step to atmosphere.
Claim 6
Dependent Claim
130 words
In a process for the manufacture of viscous materials including the step of feeding a stream of viscous material under a first pressure through a passage into a vessel for processing under a second pressure, said second pressure being lower than said first pressure and lower than atmospheric pressure, said vessel having a bore through which a rotating shaft extends from atmosphere into the vessel, there being clearance between said shaft and said bore, the method of sealing said shaft comprising: feeding a portion of said stream into said vessel between said shaft and said bore in one direction while allowing another portion to flow in the opposite direction to atmosphere, by establishing a lower resistance to flow of said material in said one direction than in said opposite direction.
Claim 7
Dependent Claim
130 words
In a process for the manufacture of viscous materials including the step of feeding a stream of viscous material under a first pressure through a passage into a vessel for processing under a second pressure, said second pressure being lower than said first pressure and lower than atmospheric pressure, said vessel having a bore through which a rotating shaft extends from atmosphere into the vessel, there being clearance between said shaft and said bore, the method of sealing said shaft comprising: feeding a portion of said stream into said vessel between said shaft and said bore in one direction while allowing another portion to flow in the opposite direction to atmosphere, by establishing a lower resistance to flow of said material in said one direction than in said opposite direction.
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) | 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 |