US3914875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam heated dryer cylinder
Assignee: JM Voith GmbH
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Filing: 1974-07-10
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Granted: 1975-10-28
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Expires: 1994-07-10
Abstract
Abstract A steam heated dryer cylinder, especially for papermaking machines and the like, in which a hollow cylindrical shell is provided which has the inner surface thereof provided with annular circumferential grooves. Steam is supplied to the interior of the cylinder for heating thereof and the condensate from the steam is withdrawn from the aforementioned grooves. Damlike inserts are provided in spaced relation in the annular grooves to obstruct the circumferential flow of condensate therein and to create intensive turbulence in the condensate thereby to promote even heat transmission over the entire area of the outer surface of the cylinder. The inserts in the annular grooves inside the cylinder are advantageously pressed in position and may range in heighth up to about the level to which condensate collects in the annular grooves.
Inventors
- 👤 Christian Schiel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:11
CPC Classifications
D; D21; D21F; D21F5/00; D21F5/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
115 words
That method of providing for substantially uniform temperature over the entire outer circumferential surface of an internally steam heated dryer cylinder having axially distributed internal circumferential groove means in which condensate collects and from which the condensate is withdrawn from at least one point fixed in the circumferential direction of the groove means, said method comprising inserting dam-like flow obstructing elements in circumferentially spaced relation in said groove means with each said element upstanding from the bottom wall of the groove mEans, said elements creating turbulent flow conditions in the condensate which collects in the groove means as the condensate flows in the groove means toward the point of withdrawal thereof from the groove means.
Claim 2
Dependent Claim
115 words
That method of providing for substantially uniform temperature over the entire outer circumferential surface of an internally steam heated dryer cylinder having axially distributed internal circumferential groove means in which condensate collects and from which the condensate is withdrawn from at least one point fixed in the circumferential direction of the groove means, said method comprising inserting dam-like flow obstructing elements in circumferentially spaced relation in said groove means with each said element upstanding from the bottom wall of the groove mEans, said elements creating turbulent flow conditions in the condensate which collects in the groove means as the condensate flows in the groove means toward the point of withdrawal thereof from the groove means.
Claim 3
Dependent Claim
133 words
In a steam heated dryer cylinder having a cylindrical outer shell; axially distributed circumferential grooves and intervening ribs formed on the inside of the shell and in which grooves condensate collects, means for withdrawing condensate from the said grooves at at least one peripheral region thereof fixed relative to the cylinder circumferentially and dam-like inserts disposed in circumferentially distributed relation in at least some of the grooves and dividing the respective grooves into circumferential regions, each insert extending from side to side of the respective groove and extending from the bottom of the respective groove a predetermined distance upwardly therein and operable to obstruct circumferential flow of condensate in that region of the respective groove which is adjacent the bottom of the groove, each said insert being press fitted into the respective groove.
Claim 4
Dependent Claim
133 words
In a steam heated dryer cylinder having a cylindrical outer shell; axially distributed circumferential grooves and intervening ribs formed on the inside of the shell and in which grooves condensate collects, means for withdrawing condensate from the said grooves at at least one peripheral region thereof fixed relative to the cylinder circumferentially and dam-like inserts disposed in circumferentially distributed relation in at least some of the grooves and dividing the respective grooves into circumferential regions, each insert extending from side to side of the respective groove and extending from the bottom of the respective groove a predetermined distance upwardly therein and operable to obstruct circumferential flow of condensate in that region of the respective groove which is adjacent the bottom of the groove, each said insert being press fitted into the respective groove.
Claim 5
Dependent Claim
28 words
A dryer cylinder according to claim 2 in which said inserts are spaced apart circumferentially in said grooves a distance of about 0.1 meters to about 0.5 meters.
Claim 6
Dependent Claim
31 words
A dryer cylinder according to claim 2 in which said predetermined distance which the inserts upstand from the bottom of the grooves is from about 2.0 millimeters to about 15.0 millimeters.
Claim 7
Dependent Claim
36 words
A dryer cylinder according to claim 2 in which each said insert is resilient in the lateral direction of the respective groove and in uncompressed state is wider than the side walls of the respective groove.
Claim 8
Dependent Claim
44 words
A dryer cylinder according to claim 2 which includes a resilient connecting element connected to a said insert in each of an adjacent pair of said grooves, said connector bridging over the rib between said pair of grooves and clampingly engaging the said rib.
Claim 9
Dependent Claim
48 words
A dryer cylinder according to claim 2 in which said inserts include a U-shaped element having side legs extending circumferentially of the cylinder and engaging the side walls of a groove and an end leg extending radially of the cylinder and engaging the bottom wall of the groove.
Claim 10
Dependent Claim
52 words
A dryer cylinder according to claim 2 in which said inserts include a pair of U-shaped elements having the end legs fixed together and engaging the bottom wall of a groove and having the side legs extending away from the fixed together end legs and engaging the side walls of the groove.
Claim 11
Dependent Claim
53 words
A dryer cylinder according to claim 2 in which said inserts include a U-shaped member having an end leg engaging the bottom wall of a groove and side legs extending upwardly along the side walls of the groove, and a filler member extending between said side legs and resting on said bottom leg.
Claim 12
Dependent Claim
60 words
A dryer cylinder according to claim 2 in which said inserts include a U-shaped member having an end leg engaging the bottom wall of a groove and side legs extending upwardly along the side walls of the groove, and a filler member integral with said bottom leg and upstanding from the bottom leg in the space between said side legs.
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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |