Patent US3841270A successfully refreshed from Google Patents.
US3841270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow restrictor for an evaporator
Assignee: Westinghouse Electric Corp
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Filing: 1972-11-01
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Granted: 1974-10-15
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Expires: 1992-11-01
Abstract
Abstract Each evaporator tube in a waste heat boiler has a flow restrictor disposed in the inlet thereof, the flow restrictor has a small diameter inlet end which converges into a smaller diameter restricting portion which discharges into the lower end of an outlet portion which is generally the same diameter as the tube, and the inlet and restricting portions are eccentrically disposed with respect to the outlet portion to provide trapless draining of the evaporator tubes.
Inventors
- 👤 P Sokolowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:35
CPC Classifications
F; F22; F22B; F22B1/00; F22B1/02; F22B1/18; F22B1/1807; F22B1/1815; F22B37/00; F22B37/62; F22B37/70; F22B37/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
A boiler having an evaporator tube, said evaporator tube comprising a plurality of portions which comprise a serpentine portion disposed in communication with hot gases passing through the boiler, an elongated restricting portion disposed upstream of said serpentine portion, a converging portion fluidly connected to the upstream end of said restricting portion, and a tubular portion disposed upstream of the converging portion, said restricting portion having an opening which is smaller than the opening in said serpenting portion and said restricting portion being eccentrically disposed with respect to said serpentine portion and so related thereto that a line defining the lower boundary of the restrictor portion and a line defining lower boundary of the adjacent serpentine portion are coincident and rectilinear, said converging portion being generally frustoconically shaped, and having a major diameter of said tubular portion, whereby said serpentine portion, restricting portion converging portion and tubular portions are cooperatively associated to provide non-trapping drainage of said evaporator tube.
Claim 2
Dependent Claim
159 words
A boiler having an evaporator tube, said evaporator tube comprising a plurality of portions which comprise a serpentine portion disposed in communication with hot gases passing through the boiler, an elongated restricting portion disposed upstream of said serpentine portion, a converging portion fluidly connected to the upstream end of said restricting portion, and a tubular portion disposed upstream of the converging portion, said restricting portion having an opening which is smaller than the opening in said serpenting portion and said restricting portion being eccentrically disposed with respect to said serpentine portion and so related thereto that a line defining the lower boundary of the restrictor portion and a line defining lower boundary of the adjacent serpentine portion are coincident and rectilinear, said converging portion being generally frustoconically shaped, and having a major diameter of said tubular portion, whereby said serpentine portion, restricting portion converging portion and tubular portions are cooperatively associated to provide non-trapping drainage of said evaporator tube.
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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |