Pressure hood with removable seal assembly

Abstract

A pressure hood with a pressure hood body to be used in conjunction with especially a heated cylinder in a machine for the production and/or conversion of a fibrous web, especially a paper-, cardboard- or tissue web, and a seal assembly to seal said pressure hood body against the cylinder, provides that the seal assembly can be inserted into or removed from the pressure hood body—particularly when the pressure hood is installed on the cylinder—through a movement in axial direction relative to the pressure hood body.

1 . A pressure hood to be used in conjunction with a heated cylinder in a machine for at least one of a production and a conversion of a web of fibrous material, said pressure hood comprising:
 a pressure hood body;   a seal assembly configured for sealing said pressure hood body against the heated cylinder, said seal assembly configured for being one of inserted into and removed from said pressure hood body through a movement in an axial direction relative to said pressure hood body.   
   
   
       2 . The pressure hood according to  claim 1 , wherein said seal assembly is configured for being one of inserted into and removed from said pressure hood body, when said pressure hood is installed on the cylinder, through said movement in said axial direction relative to said pressure hood body. 
   
   
       3 . The pressure hood according to  claim 1 , wherein said seal assembly includes a frame-type seal support which is movable in said axial direction relative to said pressure hood body. 
   
   
       4 . The pressure hood according to  claim 3 , wherein said seal support includes at least one axial segment extending in said axial direction and two curved segments extending in a circumferential direction, said curved segments being connected with each other through said at least one axial segment extending in said axial direction. 
   
   
       5 . The pressure hood according to  claim 4 , wherein said curved segments include a plurality of end areas, said curved segments being connected with each other in said plurality of end areas through said axial segment extending in said axial direction. 
   
   
       6 . The pressure hood according to  claim 4 , wherein said seal support includes at least one stiffening element, said curved segments being in addition connected with each other by at least one said stiffening element. 
   
   
       7 . The pressure hood according to  claim 4 , wherein said at least one axial segment includes a plurality of said axial segments, said seal support being guided in an area of said plurality of axial segments on said pressure hood body. 
   
   
       8 . The pressure hood according to  claim 7 , wherein when said seal assembly is fully inserted into said pressure hood body said seal assembly is configured for being secured on said pressure hood body by way of at least one of a screw connection and a clamp connection. 
   
   
       9 . The pressure hood according to  claim 7 , wherein when said seal assembly is fully inserted into said pressure hood body said seal assembly is configured for being secured on said pressure hood body by way of at least one of a screw connection and a clamp connection in an area of said plurality of axial segments of said seal support. 
   
   
       10 . The pressure hood according to  claim 7 , further comprising a plurality of guides, wherein, during movement of said seal assembly relative to said pressure hood body, said seal assembly is guided by said plurality of guides located in said area of said plurality of axial segments of said seal support at said pressure hood body and extending in said axial direction. 
   
   
       11 . The pressure hood according to  claim 10 , further comprising a plurality of spacer devices, said plurality of spacer devices configured for keeping said seal assembly during movement of said seal assembly relative to said pressure hood body at least partially at a distance from an inside of said pressure hood body. 
   
   
       12 . The pressure hood according to  claim 11 , wherein said plurality of spacer devices are configured for being that through which one of a plurality of forces and respectively a plurality of movements can be exerted in at least one of a radial direction and a circumferential direction upon said seal assembly. 
   
   
       13 . The pressure hood according to  claim 11 , wherein said plurality of spacer devices are located in said area of said plurality of axial segments of said seal support of said seal assembly. 
   
   
       14 . The pressure hood according to  claim 11 , wherein said plurality of spacer devices includes at least one said guide extending in said axial direction and at least one roll or glide element which is guided by said at least one guide, said at least one guide including a contour which, in certain places, causes a movement of said roll or said glide element in a radial direction. 
   
   
       15 . The pressure hood according to  claim 11 , wherein said plurality of spacer devices includes at least one said guide extending in said axial direction and at least one roll or glide element which is guided by said guide, said at least one guide including a contour which, in certain places, causes a movement of said roll or said glide element in said circumferential direction. 
   
   
       16 . The pressure hood according to  claim 15 , wherein said plurality of guides includes a first guide which is mounted at said pressure hood body and is movable in said circumferential direction relative to said pressure hood body. 
   
   
       17 . The pressure hood according to  claim 7 , wherein said seal assembly includes a seal which is provided all around on one side of said seal assembly that is facing away from said pressure hood body. 
   
   
       18 . The pressure hood according to  claim 17 , wherein said seal is one of a single and a multi-stage seal. 
   
   
       19 . The pressure hood according to  claim 17 , wherein said seal includes one of a sealing strip and a plurality of sealing strips progressing parallel to each other. 
   
   
       20 . The pressure hood according to  claim 19 , wherein said one of said sealing strip and said plurality of sealing strips is placed in respectively one of a groove and a plurality of grooves in said seal support of said seal assembly. 
   
   
       21 . The pressure hood according to  claim 20 , wherein a force of a pressure of said one of said sealing strip and said plurality of sealing strips on the cylinder is adjustable. 
   
   
       22 . The pressure hood according to  claim 21 , wherein said force of said pressure of said plurality of sealing strips on the cylinder is adjustable independent of each other. 
   
   
       23 . The pressure hood according to  claim 21 , wherein said sealing assembly includes a pressure tube configured for adjusting a contact pressure of said plurality of sealing strips. 
   
   
       24 . The pressure hood according to  claim 23 , wherein said pressure tube is a closed endless ring. 
   
   
       25 . The pressure hood according to  claim 24 , wherein said pressure tube possesses a bellows-type cross section. 
   
   
       26 . The pressure hood according to  claim 23 , wherein a cross sectional view of said pressure tube shows at least two chambers which are connected by at least one cross link extending between two side walls of said pressure tube that are located opposite each other. 
   
   
       27 . The pressure hood according to  claim 23 , wherein said plurality of sealing strips includes a first sealing strip and a second sealing strip, said sealing assembly including a first canal configured for removing a pressure medium from a space that is defined by said first sealing strip and said second sealing strip viewed from an interior of the pressure hood toward an outside of the pressure hood. 
   
   
       28 . The pressure hood according to  claim 27 , wherein said plurality of sealing strips includes a third sealing strip, said sealing assembly including a second canal configured for removing said pressure medium from a space that is defined by said second sealing strip and said third sealing strip viewed from said interior of the pressure hood toward said outside of the pressure hood. 
   
   
       29 . The pressure hood according to  claim 28 , wherein, at least with said sealing assembly completely inserted in said pressure hood body, said second canal is configured for being connected with a suction device. 
   
   
       30 . The pressure hood according to  claim 23 , wherein one of said sealing strip and each of said plurality of sealing strips is composed of a plurality of sealing strip segments which are movable relative to each other at a plurality of connecting locations of said plurality of sealing strip segments. 
   
   
       31 . The pressure hood according to  claim 30 , wherein said plurality of connecting locations are equipped with a cover on a side of said pressure tube. 
   
   
       32 . The pressure hood according to  claim 30 , wherein adjoining ones of said plurality of sealing strip segments include ends facing each other having extensions which engage in tongue-and-groove fashion with each other. 
   
   
       33 . The pressure hood according to  claim 30 , further comprising a device configured for preventing one said sealing strip segment which is located in one said curved segment of said seal support from moving in a longitudinal direction of said one sealing strip segment relative to said seal support. 
   
   
       34 . The pressure hood according to  claim 33 , wherein said device includes a pin-type element extending transversely through said one sealing strip segment which is secured on said seal support to prevent movement in said longitudinal direction of said one sealing strip segment and is movable in a radial direction relative to said seal support. 
   
   
       35 . The pressure hood according to  claim 34 , further comprising a guide block, wherein said pin-type element is moved, in an area of at least one end of said pin-type element, on said seal support by way of said glide block. 
   
   
       36 . The pressure hood according to  claim 34 , wherein said one sealing strip segment can turn around an axis of said pin-type element relative to said seal support. 
   
   
       37 . The pressure hood according to  claim 36 , wherein said pin-type element is one of a bolt, a pin, and a screw. 
   
   
       38 . The pressure hood according to  claim 1 , further comprising a seal provided all around said seal assembly on a side facing said pressure hood body. 
   
   
       39 . The pressure hood according to  claim 38 , wherein said seal includes at least one closed seal ring. 
   
   
       40 . An arrangement, comprising:
 a pressure hood configured for being used in conjunction with a heated cylinder in a machine for at least one of a production and a conversion of a web of fibrous material, said pressure hood including:
 a pressure hood body; 
 a seal assembly configured for sealing said pressure hood body against said heated cylinder, said seal assembly configured for being one of inserted into and removed from said pressure hood body through a movement in an axial direction relative to said pressure hood body; and 
   at least one change-over rack configured for accommodating said seal assembly one of when said seal assembly has been removed from said pressure hood body and when said seal assembly is to be inserted into said pressure hood body.   
   
   
       41 . The arrangement according to  claim 40 , wherein said change-over rack is configured for being positioned relative to said pressure hood such that said seal assembly can be accommodated by said change-over rack simultaneously with a removal of said seal assembly from said pressure hood body. 
   
   
       42 . The arrangement according to  claim 41 , wherein said change-over rack is configured for being secured in a mounting position relative to said pressure hood. 
   
   
       43 . The arrangement according to  claim 40 , wherein said at least one change-over rack includes a first said change-over rack and a second said change-over rack, said first change-over rack configured for receiving a first said seal assembly that is to be removed from said pressure hood body, said second change-over rack configured for carrying a second said seal assembly to be inserted into said pressure hood body in place of said first seal assembly.