FI12106U1 - Insulation structure for a drying cylinder of a web forming machine and a drying cylinder for a web forming machine - Google Patents

Abstract

An insulating structure for a drying cylinder of a forming machine, the insulating structure (35) being adapted to be attached to a shaft pin (13) provided with a conduit (16) with an end seal (22) for conducting steam and condensation by the insulating structure (23). in the region of the bearing (14) arranged around the shaft pin (13) in the passageway (16), characterized in that the insulating structure (35) comprises an insulating joint (21) and an inner joint (24) spaced apart (25). In addition, protection requirements 2-7.

Description

INSULATION STRUCTURE FOR DRYING MACHINE DRYING CYLINDER AND DRYING MACHINE DRYING CYLINDER

The present invention relates to an insulating structure for a drying cylinder of a forming machine adapted to be attached with an end seal to a shaft shaft provided with a duct included in the drying cylinder for conducting steam and condensation so that the insulating structure enters the duct The invention also relates to a drying cylinder of a forming machine. The steam switch is used on a fiber web machine to feed steam into the drying cylinder. The steam switch is connected to the hollow shaft pin of the drying cylinder, which is surrounded by a bearing. In this case, the drying cylinder with its shaft pins rotates with the bearing and steam coupling not rotating. The steam switch has a duct with two tubes inside. Steam is supplied through the first tube and the condensate exits the drying cylinder through the second tube. The drying cylinder also includes an insulating structure which is sealed at both ends into the duct. This will leave an insulating air gap between the insulation structure and the shaft pin.

The problem with current thermal insulation solutions is the excessive and rapid heat transfer from the inside of the bearing shaft pin to the bearing. Rapid heating causes the bearing to be more susceptible to damage.

The object of the invention is to provide a new insulating structure for the drying cylinder of a forming machine with better insulating capacity. It is a further object of the invention to provide a novel drying cylinder of a forming machine with a longer bearing life. Characteristic features of the drying cylinder of the present invention are apparent from the accompanying protective requirement 6. The insulating structure of the invention can easily increase the insulating capacity, thereby avoiding damage due to heating of the bearing. The insulation structure is also easy to fit into existing drying cylinders. In addition, the insulation capacity may be varied on a case-by-case basis to provide sufficient insulation for the most difficult positions.

The invention will now be described in detail with reference to the accompanying drawings, in which:

Figure 1 is a cross-sectional view of a drying cylinder of a prior art fiber web machine,

Figure 2 illustrates an insulating structure according to the invention fitted to a drying cylinder of a fiber web machine,

Figure 3 is a cross-sectional view of an insulating structure according to the invention.

Figure 1 shows partially one end of the prior art drying cylinder 10 of a forming machine. The drying cylinder 10 includes a shell 11, an end 12 and a hollow shaft pin 13 connected to the end 12. The shaft pin 13 has a bearing 14 allowing rotation of the drying cylinder 10. An extension of the shaft pin 13 is a steam switch 15 which is non-rotatable. The hollow shaft pin 13 defines a cylindrical passage 16 for introducing steam and condensate into and out of the dryer cylinder 10. This conduit 16 further comprises a coaxially arranged steam conduit 17 and condensation conduit 18, both of which are non-rotatable. For said pipes, the steam coupler 15 has a steam coupling 19 and a condensation coupling 20.

In the embodiment of Figure 1, the drying cylinder 10 also includes an insulating structure 35. The insulating structure 35 is fitted with end seals 22 in a channel 16 at an air gap 23 in the region of the bearing 14. In this case, the insulating structure and the air gap together form an insulating layer in the duct, which is intended to reduce the heating effect of the hot steam bearing. In the invention, the insulating structure 35 includes an insulating connection 21 and an inner connection 24 which are spaced apart from one another (Figure 2). Thereby a second insulating layer is formed in the insulating structure, which significantly increases the insulating capacity. This will prevent the bearing from heating up and causing subsequent damage.

Figure 2 illustrates an insulating structure 35 according to the invention attached to a shaft pin 13. An insulating structure is provided for a drying cylinder of a forming machine. Generally speaking, the insulating structure 35 is adapted to be attached with end seals 22 to a shaft pin 13 provided with a duct 16 in the drying cylinder 10 for conducting steam and condensate. The insulating structure 35 is positioned so that the insulating structure enters the passageway 14 around the shaft 13 at an air gap 23 in a channel 16. In the invention, the insulating structure 35 comprises an insulating connection 21 and an inner connection 24 disposed spaced apart (Fig. 3). The additional insulation thus formed reduces the heating of the bearing and thus extends the life of the bearing.

Preferably, the gap 25 is equal to or greater than the air gap 23. Thus, the insulating layers remain substantially the same. At the same time, excessive reduction of the channel diameter is avoided. The steam pipe and condensate pipe then fit well into the insulation. In Figure 2, the steam pipe 17 is depicted by a dashed line and the steam flow is represented by the arrows to the left. The condensation conduit 18 is coaxially located within the conduit 17. The condensation tube 18 is depicted by a dashed dash and the condensate current is represented by right arrows.

Figure 3 shows an insulating structure 35 according to the invention. Here, the end seals 22 at the same time form the fasteners by which the insulating connection 21 together with the inner connection 24 is secured to the shaft pin. Preferably, the gap 25 between the insulation conduit 21 and the interior conduit 24 is arranged as a closed space 26. Such a sealed structure avoids the passage of hot steam between the insulation conduit and the interior conduit to impair the insulating capacity of the insulating structure. On the other hand, the desired material or material can be accommodated in the enclosed space. Generally, the enclosed space 26 is filled with insulating material 27, which is only partially shown in Figure 3. Even the air acts as an insulator. On the other hand, the air can be removed to form a vacuum, or the air can be replaced by another gas such as argon or nitrogen. The enclosed space may also be filled with a solid or liquid or a mixture thereof. For example, fermikuite is an excellent dielectric that is inexpensive and well retains its insulating properties under hot and humid conditions.

In the embodiment of Figure 3, the insulating connection 21 and the inner connection 24 are nested tubes, preferably made of acid-proof steel. The tubes are substantially equal in length, but are slightly overlapped. This facilitates manufacturing. This inner flange 28 has a shoulder 29 on which the insulating joint 21 is welded and which centers the inner flange 28 into the channel 16 (Figure 1). Correspondingly, the inner connector 24 is welded to the inner flange 28 in the lip in the inner hole 30. This creates a gas-tight end that closes the enclosed space. The inner flange 28 is then bolted to the shaft pin 13 (Figure 2). If necessary, a seal is used between the inner flange 28 and the shaft pin 13.

The other ends of the tubes are also welded together to form a gas tightness. An intermediate sleeve 31 is used here, which holds the pipes apart and into which the pipes are welded. The outer flange 32 is dimensioned according to the insulating sleeve 21 so that axial movement between the insulating sleeve 21 and the outer flange 32 is possible. Thus, the attachment allows the insulating joint to survive without breaking. The tightness of the expansion joint is secured by a ring seal 33. The outer flange 32 is also bolted to the shaft pin 13 (Figure 2).

If necessary, an additional connection 34 is provided at the insulating connection 21, which is spaced from the inner connection 24 (Fig. 3). This results in a new dielectric layer and thus simply increased dielectricity. There may be several additional connections to form a multi-shell insulating structure. Generally speaking, the insulating structure is provided with one or more insulating spaces. Preferably, said one or more spaces are closed by, for example, welding.

Studies and tests have shown that a two-pipe insulation structure is significantly better than the old existing structure. The insulation can be further improved with a suitable insulating material. Between the pipes or joints, the insulation material is protected and, on the other hand, the discharge of the insulation material into the environment is avoided. The insulating structure can curb the heating of the bearing and thus generally eliminate damage, since the bearing temperature remains significantly lower than the known solution. At its simplest, the insulating structure is an insert which is flanged to the shaft pin channel. In one preferred embodiment, the sealed structure is provided with a sealed space on the steam side. The insulating joint and the inner joint of the insulating structure are fastened with flanges to each other and to the shaft pin. At the same time, the insulation connection and the interior connection form closed and insulating spaces. In addition, a sufficiently large unit is formed from which the steam pipe and condensate pipe can be introduced into and out of the drying cylinder.

Claims (7)

PROTECTION REQUIREMENTS 1. Isoleringskonstruktion för en arkformningsmaskins torkcylinder, werk isoleringskonstruktion (35) anordnad att fästas med ändpackningar (22) på en i torkcylindern (10) med en channel (16) utrustad axeltapp (13) för ledande av ånga och condens. 35) commercial med luftgap (23) till området för en omkring kanalens (16) axeltapp (13) anordnad lagring (14), kännetecknad av att isoleringskonstruktionen (35) innefattar en isoleringsmuff (21) och en in-nermuff (24), Please do not hesitate to contact (25) från varandra. An insulating structure for a drying cylinder of a forming machine, the insulating structure (35) being adapted to be attached to a shaft pin (13) provided with a conduit (16) with an end seal (22) for conducting steam and condensation so that the insulating structure (35) 23) in the region of the bearing (14) arranged in the channel (16) around the shaft pin (13), characterized in that the insulating structure (35) comprises an insulating connection (21) and an inner connection (24) spaced apart (25). 2. Isoleringskonstruktion enligt skyddskrav 1, kännetecknad av att avståndet (25), stort som eller större än luftgapet (23). Insulation structure according to claim 1, characterized in that the gap (25) is equal to or greater than the air gap (23). 3. Isoleringskonstruktion enligt skyddskrav 1 eller 2, kännetecknad av att isoleringsmuffens (21) and innermuffens (24) mellanrum (25) har anordnats som et slutet rum (26). An insulating structure according to the protection claim 1 or 2, characterized in that the gap (25) between the insulating joint (21) and the inner joint (24) is arranged as a closed space (26). The isoleringskonstruktion enligt skyddskrav 3, the bending device (26) and the isolating ring material (27). Insulation structure according to claim 3, characterized in that the enclosed space (26) is filled with insulating material (27). The isoleringskonstruktion enligt något av skyddskraven 1 -4, the rotary deck isolation ring (21) innefattar en tillaggsmuff (34), the flashes being opened in-nermuffen (24). Insulation structure according to one of the claims 1 to 4, characterized in that the insulating connection (21) comprises an additional connection (34) which is spaced apart from the inner connection (24). 6. Arkformningsmaskinens torkcylinder, woolen inhaler (16) utrustad axeltapp (13) omkring werner in isolation ring construction (35), woolen anordnad med ändpackningar (22) till channel (16) med et luftgap (23) till området för lagringen (14), teleconnection av att isoleringskonstructtionen (35) innefattar en isoleringsmuff (21) och en in-nermuff (24), lively anordnade på ett avstånd ( 25) från varandra. A drying cylinder for a forming machine, comprising a shaft pin (13) provided with a passage (14) for conducting steam and condensation and a bearing (14) arranged around it and an insulating structure (35) fitted with an end seal (22) in the passage (16). 23) in the region of the bearing (14), characterized in that the insulating structure (35) comprises an insulating connection (21) and an inner connection (24) spaced apart from one another (25). Drying cylinder according to protection claim 6, characterized in that the insulating structure (35) is an insulating structure according to one of the protective claims 2 to 5. SKYDDSKRAV 7. Torkcylinder enligt skyddskraven 6, kännetecknad av att i soleringskonstruktionen (35), en inseringskonstruktion enligt något av skyddskraven 2-5.