DE506656T1

DE506656T1 - VENTILATION ROLLER WITH TEMPERATURE COMPENSATION.

Info

Publication number: DE506656T1
Application number: DE1990905974
Authority: DE
Inventors: A. Dale Milton Wi 53563 Brown; J. Arnold Roerig; L. Gregory Beloit Wi 53511 Wedel
Original assignee: Beloit Technologies Inc
Current assignee: Beloit Technologies Inc
Priority date: 1989-12-20
Filing date: 1990-04-09
Publication date: 1993-02-25

Claims

90 905 974.3 Patent claims

1. Roller (12) for ventilating air in a pocket (P), such as the space between the drying rollers (10), the fabric (F) and the paper web (W) in a paper machine, comprising in combination:

a stationary center shaft (16) having an interior, a front and rear end with pivot pins (16', 30) at both ends;

a wall device (19) in the central shaft, which forms from a part of the interior a plurality of longitudinally extending chambers (18, 20), wherein at least two vacuum chambers (20) and at least two pressure chambers (18) are present;

a vacuum conduit means (36) within at least one of the pivot pins (16', 30) for establishing fluid communication between a source (38) of subatmospheric pressure air and a vacuum chamber (20);
a pressure line device (32) in at least one of the pivot pins (16', 30) for establishing a fluid connection between a source of air at superatmospheric pressure (34) and a pressure chamber (18);
a roll shell (26) having perforations (24) in its cylindrical surface, the perforations (24) extending along an effective side length of its surface to allow ventilation air to pass therethrough;

Bearings (28) at each end of the roller (12) for rotatably supporting the roller shell (26) about the central shaft (16);

a first connecting device (44) which brings at least two of the plurality of pressure chambers (18) into fluid communication with one another;
a second connecting device (49) which brings at least two of the plurality of vacuum chambers (20) into fluid communication with one another;
wherein the wall means (19) and the first and second connecting means (44, 49) are arranged so that the vacuum and pressure chambers (18, 20) alternate circumferentially around the central shaft (16);

a sealing device (22) arranged between the central shaft (16) and the roll shell (26) and in sliding contact with the inner surface of the roll shell, the sealing device (22) maintaining the fluid separation between the vacuum and pressure chambers (18, 20) between the central shaft (16) and the roll shell (26);

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a distribution device (23, 25) within at least one vacuum chamber (20) for receiving air from the bag and within at least one pressure chamber (18) for distributing air into the bag.

2. A roller for ventilating air in a bag according to claim 1, wherein:
the first connecting device has a chamber (44) which connects adjacent ends of the first and second pressure chambers (18).

3. Roller for ventilating air in a bag according to claim I ₁ , wherein:
the second connecting device has an opening (49) which connects adjacent ends of the first and second vacuum chambers (20).

4. A roller for ventilating air in a bag according to claim 1, wherein:
the first connecting means comprises a chamber (44) which connects the downstream end of a first pressure chamber (18, 18a, 18b, 18c) to the upstream end of a second pressure chamber (18', 18a', 18b', 18c'); and

the second connecting device has an opening (49) which connects the downstream end of a first vacuum chamber (20, 20a, 20b, 20c) to the upstream end of a second vacuum chamber (20', 20a', 20b', 20c').

5. A roller for ventilating air in a bag according to claim 1, wherein:
the first and second connecting means each have an opening (44d, 49d) which connects two pressure or vacuum chambers (18d, 18d', 20d, 20d') between their ends.

6. A roller for ventilating air in a bag according to claim 4, wherein:
the distribution device has a plurality of openings (23, 23a, 23b, 23c, 23d, 25, 25a, 25b, 25c, 25d) in both the second vacuum and the second pressure chambers (20', 20a', 20b', 20c', 20d', 18', 18a', 18b', 18c', 18d').

7. A roller for ventilating air in a bag according to claim 1, wherein:
the sealing device comprises annular seals (40, 42) between the central shaft (16) and the roll shell (26) near each end of the effective side length and longitudinal sealing devices (22, 22', 22") which are located between

see the annular sealing device, wherein the longitudinal sealing devices are arranged between adjacent vacuum and pressure chambers (20, 20a, 20b, 20c, 20d, 18, 18a, 18b, 18c, 18d).

8. A roller for ventilating air in a bag according to claim 1, wherein:
the pressure and vacuum line means (32, 36) are in the same end of the roller;

the first and second connecting devices (44, 44a, 44b, 44c, 44d, 49,

49a, 49b, 49c, 49d) connect the pressure and vacuum chambers so that the

Direction of air flow in adjacent pressure and vacuum chambers (18, 20) is in opposite directions.

9. A roller for ventilating air in a bag according to claim 8, wherein:
the chambers (18', 20', 18a', 20a', 18b', 20b', 18c', 20c', 18d', 20d') having distribution devices are adjacent to one another.

10. A roller for ventilating air in a bag according to claim 9, wherein:
the chambers having distribution devices are the most upstream (20', 20b') of the connected vacuum chambers and the most downstream (18', 18b') of the connected pressure chambers.

11. A roller for ventilating air in a bag according to claim 8, wherein:
the central shaft (16) has two vacuum chambers (20, 20', 20a, 20a', 20b, 20b', 20c, 20c', 20d, 20d') and two pressure chambers (18, 18', 18a, 18a', 18b, 18b', 18c, 18c', 18d, 18d') which are arranged alternately in the circumferential direction around the central shaft, the most upstream vacuum chamber having a distribution device which is adjacent to the most downstream pressure chamber which has a distribution device.

12. A roller for ventilating air in a bag according to claim 1, wherein:
the vacuum and pressure line means (32, 36) are in the same pivot (16') and are each connected to a corresponding one of the vacuum and pressure chambers.

13. A roller for ventilating air in a bag according to claim 1, wherein:
the pressure and vacuum line devices (32, 36) are in opposite ends of the roller.

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14. A roller for ventilating air in a bag according to claim 1, wherein:
the pressure and vacuum line devices (32, 36) are each in both ends of the roller.

15. Roller (12) for ventilating air in a pocket (P), such as the space between the drying rollers (10), the fabric (F) and the paper web (W) in a paper machine, comprising in combination:

a center shaft (16) having an interior and a front and rear end;

a pivot pin (16', 30) at each end of the central shaft (16), at least one of the pivot pins (16') being hollow;

a first wall means (19) extending diametrically across the at least one hollow pivot (16') and the interior of the center shaft, the first wall means or an extension thereof dividing the at least one hollow pivot into vacuum and pressure lines (36, 32) for connecting sources (38, 34) of air of subatmospheric pressure and superatmospheric pressure, respectively, to the interior of the center shaft;
a second wall means (21) in the central shaft (16) which, with the first wall means (19) and the interior of the central shaft, transforms a portion of the interior space into a plurality of longitudinally extending chambers (18, 20), there being at least two vacuum chambers (20, 20', 20a, 20a', 20b, 20b', 20c, 20c', 20d, 20d') and at least two pressure chambers (18, 18', 18a, 18a', 18b, 18b', 18c, 18c', 18d, 18d');
a roll shell (26) having perforations (24) in its cylindrical surface, the perforations extending along an effective side length of its surface to allow ventilation air to pass therethrough;

Bearings (28, 28a) at each end of the roller for rotatably supporting the roller shell on the pivot pins (16', 30) about the central shaft (16);

a first connecting device (44, 44a, 44b, 44c, 44d) which brings at least two of the plurality of pressure chambers (18, 18', 18a, 18a', 18b, 18b', 18c, 18c', 18d, 18d') into fluid communication with one another;
a second connecting device (49, 49a, 49b, 49c, 49d) which brings at least two of the plurality of vacuum chambers (20, 20', 20a, 20a', 20b, 20b', 20c, 20c', 20d, 20d') into fluid communication with one another;
wherein the first and second wall means (19, 21) are arranged within the

the central shaft and the first and second connecting means are arranged so that the vacuum and pressure chambers alternate in the circumferential direction around the central shaft;

a sealing device (22, 22', 22") arranged between the center shaft (16) and the roll shell (26) and in sliding contact with the inner surface of the roll shell, the sealing device maintaining the fluid separation between the vacuum and pressure chambers between the center shaft and the roll shell;

a distribution device (23, 23a, 23b, 23c, 23d, 25, 25a, 25b, 25c, 25d) within at least the most upstream vacuum chamber for receiving air from the bag and within at least the most downstream pressure chamber for distributing air into the bag.

16. A roller for ventilating air in a bag according to claim 15, wherein: the downstream end of the pressure chamber (18, 18a, 18b, 18c) connected to the pressure line is connected to the upstream end of the next pressure chamber (18', 18a', 18b', 18c');

wherein the upstream end of the vacuum chamber (20, 20a, 20b, 20c) connected to the vacuum line is connected to the downstream end of the next vacuum chamber (20', 20a', 20b', 20c').