FI86090B - STOED FOER AONGINMATNINGSROERET I TORKCYLINDERN AV EN PAPPERSMASKIN. - Google Patents

Description

86090

Paper machine dryer cylinder steam supply pipe support Stöd för änginmatningsröret i torkcylindem av en pappersmaskin 5

The invention relates to the support of the steam supply pipe of the drying cylinder of a paper machine. In the construction, the steam supply pipe is passed through the axis of the drying cylinder of the paper machine and the condensate discharge pipe is placed centrally in the steam supply pipe. Through the condensate drain pipe, the condensate is transferred out of the drying cylinder. The invention relates to a drying cylinder structure in which a siphon or suction tube is in place and in which a suction tube in place collects condensate from the condensate groove on the circumference of the cylinder as the cylinder rotates. As the cylinder rotates, condensate flows into the chute. The transport of water is facilitated by the kinetic energy of the water and the pressure difference between the steam and condensate ducts.

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In known solutions for supporting the steam supply pipe of a drying machine of a paper machine, the steam supply pipe is supported only at the outermost end of the axial steam supply pipe. The contact between the stationary piping and the moving structures in the cylinder's internal steam supply and condensate removal piping causes excitation forces 20 which produce vibrations which further lead to contact between the end of the trap tube and the inner surface of the cylinder liner. Said contact provides. high excitation force leading to further increasing oscillation amplitudes. Vibrations lead to fractures and possibly damage to the entire cylinder structure. Especially as the cylinder sizes increase, the distance of the end of the catch tube from the bearing point increases and thus the torque arm increases with which the excitation force caused by the possible contact between the catch tube and the cylinder liner acts.

•. · Therefore, the current support solutions for the steam supply pipe and condenser pipe of the paper machine drying cylinder do not provide the best possible stability against vibration phenomena: 30 and therefore do not allow the most reliable and long-lasting construction.

2,86090

The object of the invention is therefore to eliminate the above-mentioned problems due to the support of the steam supply pipe, and the object is a structure in which the so-called the standing siphon is well supported in all driving conditions.

It is realized in the invention to form a support structure of a drying cylinder of a paper machine in which the steam supply pipe of the steam supply and condensate removal device of the drying cylinder is supported by a support bearing from inside the drying cylinder. The support bearing is adapted to be located inside the rotating shaft of the drying cylinder near the end flange of the roll. Thus, the support bearing is adapted to be located at the cylindrical end 10 of the steam supply pipe as close as possible to said end of the steam supply pipe. In the support solution according to the invention, the support bearing comprises a counter-ring which rotates with the cylinder. The steam pipe with bearing ring remains in place. In a preferred embodiment of the invention, the support bearing solution comprises a spring load to keep the cooperating bearing surfaces in close contact with each other also in situations where the bearing ring is worn.

In the embodiment, there is a guide strip between the steam pipe and the bearing ring, which is flexible under impact loads and allows axial movement of the bearing ring, whereby by means of a spring force the bearing ring can be pressed against its counter-bearing surface. Preferably, in this embodiment, the bearing surfaces are slightly curved spherical, which compensates for the possible wear of the bearing ring when the spring force always presses the bearing ring tightly against its counter-bearing surface. The design also allows for good steam sealing, in which case it is conceivable that the support bearing is also used as a steam switch. With the support solution, the characteristic frequency 25 of the piping structure is made higher and the structure is used to reduce the deflection, i.e. to prevent the bottom of the trap tube from being prevented.

The steam supply pipe support structure of the paper machine drying cylinder according to the invention is mainly characterized in that the steam supply pipe support structure comprises 30 support bearings. parts at a constant distance from each other with the bearing means ensuring a vibration-free attachment of the steam supply pipe to the drying cylinder.

The invention will now be described with reference to some preferred embodiments of the invention shown in the figures of the accompanying drawings, to which, however, the invention is not intended to be exclusively limited.

Figure 1 shows a drying cylinder of a paper machine according to the invention with its steam and condensate tube outlets in a cross-sectional view.

Figure 2 is a cross-sectional view of a support tube for a steam tube of a drying cylinder of a paper machine.

Figure 3 shows another preferred embodiment of a support bearing according to the invention in a cross-sectional view.

Figure 4Λ illustrates the lubrication arrangement of the support bearing.

Figure 4B shows the location of the other end of the water pipe in connection with the end of the catch pipe.

Figure 4C shows the connection of the end of the water pipe to the support bearing and the channel outlets comprising the support bearing for conducting water to the bearing surface.

Figure 5A shows another embodiment of the support bearing.

Figure 5B is a separate view of the support bearing of Figure 5A.

Figure 5C is a partial section I-I of Figure 5B.

30 and 4,86090

As shown in Figure 1, the drying cylinder 10 comprises a space D inside the jacket 10a into which the steam is introduced. The jacket 10a of the drying cylinder 10 is connected to the shaft pin 10c via a flange 10b. The drying cylinder 10 is adapted to rotate on bearings 11.

5 Steam is introduced through the steam piping into the internal space D of the drying cylinder 10, and after the steam has condensed, the condensate water is conveyed out of the drying cylinder through the condensate piping.

The steam is led from the inlet steam pipe 12 to the steam pipe 13 in the direction of the central axis X of the drying cylinder through its end perforation 13a. The flow of steam from the inlet steam pipe 12 to the steam pipe 13 through its end perforation 13a is shown by the arrows L 1.

The steam is discharged into the inner space D of the drying cylinder shell 10a as shown by the arrow Lj. After the steam has condensed and given off its heat to the drying operation, the condensate is collected by the trap tube 14 from the condensate groove IS on the inner surface of the jacket 10a. The catch tube 15 is supported by a support 16. When changing the direction of rotation of the drying cylinder 10, the position of the catch tube 14 can be turned. Arrow L, shows the passage of condensate out of space D. From the trap tube 14, the condensate is transferred to the condensate tube 17, which is parallel to the central axis X of the drying cylinder 10. As shown by arrow L4, the condensate is further conveyed through the flow indicator 18 to the outlet pipe 19 and further out of connection with the drying cylinder. The condensate pipe 17 passes inside the steam pipe, i.e. the steam supply pipe 13.

The steam and condensate switch 20 allows the steam and condensate tubes to pass through the shaft pin 10c of the drying cylinder inside the drying cylinder 10. The coupling 20 enables a structure in which the above-mentioned tubes are located in a fixed position inside the rotating shaft structure surrounding them 25.

The steam and condensate switch 20 comprises a body 21, i.e. a rotary support. The body 21 of the steam switch 20 surrounds the end part of the steam pipe 13 and the end part of the condensate pipe 17 running inside the steam pipe 13. The body 21 comprises an inner annular flange part: 30 23 for a seal 24. The inner flange part 23 is connected by a conical connection 25 to the steam pipe '13 on its outer surface.

5,86090

As shown in Figure 1, the construction comprises a conical connection 25 by which the outer end of the steam pipe 13 is connected to another frame structure. In the prior art solutions, the support structure of the steam supply pipe comprised only the above-mentioned 5 conical connection 25.

In the construction according to the invention, the tubular structure is supported not only by a conical connection 25 but also by a support bearing 26.

As shown in more detail in Figure 2, the support bearing 26 according to the invention comprises a retaining ring 27 of the spring 28. The retaining ring 27 of the spring 28 is tightened on the steam pipe 13. The spring 28 compresses the retaining ring 29 of the carbon bearing 30 by its spring force so that the curved, spherical or conical bearing surface 30a of the carbon bearing 30 is in constant contact with the counter-bearing surface 31a of the same shape of the counter ring 31. As shown in the figure, the counter ring 15 is fixed to the rotating shaft 10c by a screw 32 and the exact position of the structure is ensured by a centering flange 33. The screw 32 is passed through both the counter ring 31 and the centering flange 33 to the shaft 10c.

The retaining ring 29 of the carbon bearing 30 comprises a sliding belt 34 which allows the retaining ring 20 29 to move axially with the force provided by the spring 28. It should also be noted that when a high vapor pressure is introduced into the interior of the cylinder, the force provided by the vapor pressure acts on the surface 29a perpendicular to the axial direction of the retaining ring, the higher the vapor pressure A prerequisite for said operation is that no steam enters between the bearing surfaces 3a, 30a and that the surface level 29b of the bearings on the opposite side is smaller in area than the level 29a in area.

Shown in broken lines in Fig. 2, the steam supply pipe 13 may comprise a through opening a, 30 through which steam is led to the steam and condensate switch 20 (Fig. 1). This avoids possible damage to the seal 24 of the steam and condenser switch 20.

• · · · 6 86090

Figure 2 further shows a crank pin 35 secured by a screw 36 to the retaining ring 29 of the carbon bearing 30. The end of the crank pin 35 is guided in the hole 37 in the retaining ring 27 of the spring 28.

5

Figure 3 shows an embodiment of the invention in which the bearing ring of the support bearing comprises a sliding strip 34 on its surface facing the upper surface of the steam tube and a seal 38 in front of it.

10

In the embodiment of Figure 3, the screw 41 is passed through the retaining ring 27 of the spring 28 and is secured thereto by screw threads 42. The end protruding from the retaining ring 27 of the screw 41 is inserted into the mating hole 43 of the bearing ring 30 and is guided therein.

Figure 4A shows the lubrication arrangement of the bearing of Figures 2 and 3. As shown in Fig. 4A, condensate is used as a lubricating fluid, which is flashed from the condensate groove of the drying cylinder 10 by passing the water pipe 44 from its end to the condensate groove inside the end of the catch pipe. The end 44a of the water pipe 44 is adapted to open inside the catch pipe 14, whereby the flow of water to the support bearing 26 is provided in a manner similar to the removal of condensate from inside the drying cylinder. In the transfer of water inside the water pipe 44, the kinetic energy of the water in the drying cylinder is utilized.

As shown in Fig. 4B, lubricating water on the bearing is obtained by placing the end of the water pipe 44 in the siphon housing 14b in the dam pressure position and connecting the other end 25 of said water pipe 44 to the support bearing 26. Since the required amount of water (1 / min) is small, e.g. sufficient. To prevent dirt particles from entering the bearing, the tube 44 is provided with a filter 44b.

Figure 4C shows the connection of the water pipe 44 to the flow channel 30a leading to the support bearing 26. The channel 45a is further connected to the holder of the carbon ring 7 86090 as shown in Fig. 4C, and the carbon ring is provided with bores 45b through which water is led to the bearing surface to be lubricated.

Fig. 5A shows another embodiment of a steam pipe support bearing according to the invention. The support bearing 260 is a rolling bearing in the embodiment of Figures 5A-5C. It comprises an inner ring 46, an air gap S between the inner surface 46a of the inner ring and the outer surface 13 of the steam pipe at points other than the fastening strip 47. The inner ring thus rests on the steam tube by means of a heat insulating strip 47. In other respects, there is an air gap S between the inner ring and the steam pipe. This prevents the inner ring from heating up rapidly in the initial heating step 10 and the consequent loss of bearing clearance. In the bearing according to the invention, the bearing comprises a plurality of bearing rollers 48 and the rollers are held together by a roller holder 49. The bearing comprises an outer ring 50. The bearing is fitted to the structure such that the inner ring 46 is secured to the steam supply pipe 13 by a securing tape 47. The outer ring 50 is fitted inside the housing 51 and held in the housing structure by the cover 52 by the screw 52 The screw 53 is inserted through the cover 52 and the housing 51 onto the shaft 10c.

The material of the bearing according to the invention is preferably stainless hardened HRC 20 45 .. .55, which is the best hardness in terms of wear. The bearings are cylindrical roller bearings, in which case there is a clean rolling movement in the bearing situation and no sliding component is present. The bearing according to the invention is thus machine-shop-ready, maintenance-free, impact-resistant and long-lasting.

Fig. 5B is a separate view of the support bearing 260 of Fig. 5A. The support bearing 260 comprises an inner ring 46 and a fastening strip 47. The rollers 48 are connected to each other and guided relative to each other by means of a roller holder 49, which is preferably made of bronze. The outer ring 50 is further connected to the bearing housing.

30 Figure 5C shows in part of the bearing of Figure 5B, Figure 5B the arrow D direction. The rollers 48 are preferably cylindrical rollers, with only rolling contact between the stationary inner ring 4689090 and the rotating rollers 48. The housing 51 and the outer ring 50 fixed to the shaft 10c and the cover 52 rotate with the drying cylinder.

5

Claims (11)

1. Support for the steam feed tube (13) in the drying barrel (10) of a paper machine, in which the drying cylinder construction is guided by the steam feed and condensate tubes (13,17) inside (D) the drying barrel (10), whereby the steam feed pipe (13) is led the drying cylinder and via the take-up and condensate tube (14,17), condensate is removed from the space (9) inside the cylinder (10), and in which drying cylinder construction a capacitor tube (17) is located inside the steam supply tube (13) and in which the drying cylinder the steam supply tube (13) and the take-up and condensate tubes (14,17) are positioned in relation to a cylinder structure rotating in relation thereto, characterized in that the support structure for the steam supply tube (13) comprises a support layer (26). ; 260), by means of which the steam feeding tube (13) is firmly supported relative to a shaft structure (10c) which is movable and rotating in relation thereto, thereby ensuring that such rotational movement on the rotary shaft structure (10c) does not give rise to impulses while the bearing members (26) incline the steam supply tube (13) and the relative parts of this movable member at a constant distance. from each other, while the bearing members guarantee a vibration-free fastening of the steam feeding tube (13) relative to the drying cylinder. 20 A meadow feeding tube support according to claim 1, characterized in that a support layer (26) is provided at the end of the meadow feeding tube (13) which is substantially in contact with the end flange (10b) of the drying cylinder. A meadow feeding tube support according to claim 1 or 2, characterized in that the support layer (26) is arranged to be supported against the outer surface of the meadow feeding tube (13):. "and on the other hand towards the rotating shaft assembly (10c). 4. A support for meadow feeding pipes according to any of the preceding claims, characterized in that the support bearing (26) comprises a spring (28) between the spring retaining ring (27) and bearing ring (30), whereby the spring force of the spring (28) the bearing ring (30) projects firmly to the counter-bearing ring (31) at its counter-bearing surface (31a). 5. Support according to any of the preceding claims, characterized in that the bearing ring (30) is a carbon ring. Support according to the preceding claim, characterized in that the bearing ring (30) is arranged in a separate retaining ring (29) which is arranged to slide on top of the steam feeding pipe (13) while the retaining ring (29) is provided with a sliding belt (34). ), which enables axial directional movement of the retaining ring (29) with a force exerted by the spring (28). Support according to any of the preceding claims 1-5, characterized in that the bearing ring (30) is arranged directly via the sliding belt (34) on top of the meadow feeding tube (13) and that the bearing ring (30) further comprises a seal (38) which prevents the mud leakage. between the bearing ring and the meadow feeding tube (13). 8. A support according to any preceding claim, characterized in that the support bearing comprises a bearing ring (30) having a curved, advantageously spherical or conical bearing surface (30a) and which is arranged to function with the counter-bearing surface (31a) of a counter ring of the same shape. like this. Support according to any of the preceding claims, characterized in that there is a water pipe (44) through which condensate water is led from the drying cylinder to the support layer (26). Support according to the preceding claim, characterized in that one end of the water pipe (44) is arranged inside the end of the receiving pipe (14) and the other end is guided to the support layer (26), the support layer (26) comprising a channel. advantageously a bore (45b), in the bearing ring (30) through which water is fed to the bearing surface to be lubricated. 11. A meadow feeding tube support as claimed in any preceding claim, characterized in that the support bearing (260) is a bearing comprising rolling means, advantageously bearing rollers (48), the bearing comprising an inner ring (46) and an outer ring (50) for guiding and holding the storage rollers (48), wherein the inner ring (46) is arranged to be fixed to the outer surface of the steam supply tube (13) by mediating a fastener (47), by means of the fastening band (47), an air gap (S) forms between the inner ring (46) and the meadow feeding tube (13), the fastening between the support layer (260) and the meadow feeding tube (13) being essentially only a fastening band (47) and wherein the air gap (S) guarantees a slow heating of the inner ring of the bearing in the bend of the heating stage of the drying cylinder and that the bearing intermediate spaces are poured within the desired tolerances and in which supporting bearing structure the outer ring (50) is fixed. at the rotatable shaft (10c) of the drying cylinder at the central drilling of the shaft (10c), the outer ring (50) rotating with the shaft (10c) and ensuring by means of the roller means which are advantageously bearing rollers (48) a substantially frictionless rotary movement and firmly supports the meadow feeding tube (13) at the rotating shaft structure. 20