Drying hood, drying arrangement and use thereof

Patent metadata

Field	Value
Publication number	US-11118310-B2
Application number	US-201816487285-A
Country	US
Kind code	B2
Filing date	Feb 8, 2018
Priority date	Feb 20, 2017
Publication date	Sep 14, 2021
Grant date	Sep 14, 2021

Abstract

A drying hood for drying a fibrous web, such as a tissue paper web, includes a plurality of nozzle boxes for supplying or discharging air and a housing that at least partially surrounds the nozzle boxes. The nozzle boxes are each individually mounted on the housing by a first bearing and a second bearing. The two bearings allow at least one movement of the nozzle box relative to the housing along a longitudinal axis of the nozzle box and/or at least one movement in a direction transverse thereto, along a transverse axis of the nozzle box. The two bearings have translational degrees of freedom differing by one. A drying arrangement having a drying cylinder and the drying hood is also provided.

First claim

The invention claimed is:

1. A drying hood for drying a fibrous web or a tissue paper web, the drying hood comprising:
a plurality of nozzle boxes for supplying or discharging air, each of said nozzle boxes having a longitudinal axis and a transverse axis being transverse to said longitudinal axis;
a housing at least partially surrounding said nozzle boxes;
first and second bearings, a respective one of said first bearings and a respective one of said second bearings individually mounting each of said nozzle boxes on said housing;
said first and second bearings allowing at least one movement of said nozzle boxes relative to said housing along at least one of said longitudinal axis or said transverse axis; and
said first and second bearings having translational degrees of freedom differing from one another by one degree of freedom; and
said first and second bearings being linear bearings or pure linear bearings.

2. The drying hood according to claim 1 , wherein said first bearings have two translational degrees of freedom, and said second bearings have one translational degree of freedom.

3. The drying hood according to claim 2 , wherein said first bearings permit a movement of said nozzle boxes relative to said housing in said longitudinal direction and in said transverse direction, and said second bearings permit a movement of said nozzle boxes relative to said housing in said transverse direction.

4. The drying hood according to claim 2 , wherein:
said first bearings are doubly displaceable and are configured to permit displacement of said nozzle boxes relative to said housing along said longitudinal axes of said nozzle boxes and along said transverse axes; and
said second bearings are configured to be singly-displaceable bearings allowing displacement of said nozzle boxes relative to said housing along said transverse axis.

5. The drying hood according to claim 1 , wherein said nozzle boxes have axial ends, and said first and second bearings mounting a respective one of said nozzle boxes are each disposed in a region of a respective one of said axial ends.

6. The drying hood according to claim 1 , wherein said housing and said nozzle boxes have end faces facing each other, and said first and second bearings mounting a respective one of said nozzle boxes are each disposed in a region of a respective one of said end faces.

7. A drying hood for drying a fibrous web or a tissue paper web, the drying hood comprising:
a plurality of nozzle boxes for supplying or discharging air, each of said nozzle boxes having a longitudinal axis and a transverse axis being transverse to said longitudinal axis;
a housing at least partially surrounding said nozzle boxes;
first and second bearings, a respective one of said first bearings and a respective one of said second bearings individually mounting each of said nozzle boxes on said housing;
said first and second bearings allowing at least one movement of said nozzle boxes relative to said housing along at least one of said longitudinal axis or said transverse axis;
said first and second bearings having translational degrees of freedom differing from one another by one degree of freedom; and
said first and second bearings each configured as a respective guide rail including a groove and a bolt engaging in said groove, said grooves associated with said housing and said bolts each associated with a respective nozzle box or bounded or formed by said respective nozzle box.

8. The drying hood according to claim 7 , wherein each of said bolts has a rotationally symmetrical outer contour, and each of said grooves is a straight longitudinal groove formed to be complementary to said bolt engaging in said longitudinal groove.

9. The drying hood according to claim 7 , wherein said bolt of at least one of said first or second bearings has an axial end facing said housing and being connected to or connectable to said housing by a force-locking, form-locking or material connection.

10. The drying hood according to claim 9 , wherein said bolt of at least one of said first or second bearings has an axial end facing a respective one of said nozzle boxes and engaging said groove associated with said respective one of said nozzle boxes.

11. A drying hood for drying a fibrous web or a tissue paper web, the drying hood comprising:
a plurality of nozzle boxes for supplying or discharging air, each of said nozzle boxes having a longitudinal axis and a transverse axis being transverse to said longitudinal axis;
a housing at least partially surrounding said nozzle boxes;
first and second bearings, a respective one of said first bearings and a respective one of said second bearings individually mounting each of said nozzle boxes on said housing;
said first and second bearings allowing at least one movement of said nozzle boxes relative to said housing along at least one of said longitudinal axis or said transverse axis;
said first and second bearings having translational degrees of freedom differing from one another by one degree of freedom; and
at least one linear stop being associated with or formed by said first bearing and forming a defined gap between end faces of said housing and said nozzle box facing each other.

12. A drying hood for drying a fibrous web or a tissue paper web, the drying hood comprising:
a plurality of nozzle boxes for supplying or discharging air, each of said nozzle boxes having a longitudinal axis and a transverse axis being transverse to said longitudinal axis;
a housing at least partially surrounding said nozzle boxes;
first and second bearings, a respective one of said first bearings and a respective one of said second bearings individually mounting each of said nozzle boxes on said housing;
said first and second bearings allowing at least one movement of said nozzle boxes relative to said housing along at least one of said longitudinal axis or said transverse axis;
said first and second bearings having translational degrees of freedom differing from one another by one degree of freedom; and
said first and second bearings being sliding bearings.

13. A drying arrangement for drying a fibrous web or a tissue paper web, the drying arrangement comprising:
a drying cylinder; and
a drying hood according to claim 1 at least partially surrounding said drying cylinder.

14. The drying arrangement according to claim 13 , wherein said drying cylinder has an outer circumference, and said plurality of nozzle boxes is disposed around said drying cylinder over at least a part of said outer circumference.

15. The drying arrangement according to claim 13 , wherein said drying cylinder is heated or is configured to be heated.

16. The drying arrangement according to claim 15 , wherein said drying cylinder is a Yankee cylinder.

17. A method for drying a fibrous web or a tissue paper web, the method comprising the step of using the drying hood according to claim 1 to dry the fibrous web or the tissue paper web.

18. A method for drying a fibrous web or a tissue paper web, the method comprising the step of using the drying hood of the drying arrangement according to claim 13 to dry the fibrous web or the tissue paper web.

Assignees

• Voith Patent Gmbh

Inventors

• Boegershausen Andreas

Classifications

• F26B21/50

  Ducting arrangements from the source of air or other gases to the materials or objects being dried · CPC title

• D21F5/181

  on Yankee cylinder · CPC title

• D21F5/182

  through perforated cylinders · CPC title

• D21F5/004

  Drying webs by contact with heated surfaces or materials · CPC title

• D21F5/143

  through perforated cylinders · CPC title