FI85999C - Steam and condensate connection for the drying cylinder in a paper machine - Google Patents

Description

85999

Steam and condensate switch for paper machine dryer cylinder Ang- och condensate coupling for torkningscylindern i en pappersmaskin 5

The invention relates to a steam and condensate switch for a drying machine of a paper machine.

10 The steam and condensate switch of the drying cylinder forms a pressure-tight connection between the shaft of the rotating drying cylinder and the fixed structures. By means of spring force and steam pressure, the sealing ring is pressed against a rotating flange attached to the end of the shaft. The steam and condensate pipes are passed through the shaft pin and the sealing ring is adapted to surround the above-mentioned pipelines. The installability of the current switch is demanding and slow to perform. The flanges attached to the shaft end of the drying cylinder cast in the axial and radial directions. Often these emissions are left to be corrected after installation. Carbon exchange in switch structures is difficult to perform. The force with which the carbon is pressed against the flange attached to the end of the shaft 20 depends on the spring force of the springs and the bellows and the steam pressure. Thus, the force adjustability is poor and within the sealing carbon, the spring force decreases.

In the case of switchgear according to the prior art, a high starting friction of the sealing carbon is caused in the starting states. This will cause the carbon to wear out and: · .. be damaged quickly.

The object of the invention is to provide a new type of steam and condensate switch for the drying cylinder of a paper machine, in which the above-mentioned disadvantages are avoided.

The object of the invention has been achieved by a device solution in which the force required to close the sealing surface '·' 'is provided partly by means of the pressure of the medium, preferably by liquid pressure and most preferably by water pressure and 35 partly by spring force of the seal spring. In one embodiment of the invention, a separate sealing fluid is used, which is introduced inside the annular seal, whereby the seal is pressed against the rotating flange surface of the rotary drying cylinder 2 85999 by means of liquid pressure, preferably water pressure. According to the invention, the water pressure is adjusted according to the vapor pressure prevailing in the drying cylinders. In this way, the desired compaction pressure is selected steplessly according to the different steam pressures. In addition, the sealing fluid lubricates and cools the sliding surface pairs.

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The steam and condensate switch according to the invention is formed in such a way that the support of the switch with its frame structures can be turned at intervals determined by the screw division according to the different inlet directions of the steam pipe.

According to the invention, the seal is a groove ring seal comprising an inner spring adapted to press the seal lip towards the surface to be sealed.

In the prior art solutions, the vacuum situations inside the drying cylinder caused the seal to loosen. In the structure according to the invention, said disadvantage does not occur, because the sealing force is provided not only by means of the pressure of the medium but also by means of the spring force of the spring of the groove ring seal.

According to the invention, the seal comprises a sliding ring attached to the groove ring. Ceramic materials are preferably used as the material of the slip ring. The connective tissue can also be used between the slip ring and the sealing lip as a slip ring mounting base.

The steam and condensate coupling according to the invention is mainly characterized in that the groove ring seal is one in which the pressure of the medium can be controlled in the inner groove, that the groove ring seal comprises an inner spring of the annular seal and that the seal. comprises a slip ring connected to the second lip, which slip ring 30 is pressed against the rotatable flange surface of the cylinder to be sealed by at least the spring force of the spring comprising the groove ring seal and the normal. in the event of overuse, by means of spring force and liquid or vapor pressure introduced into the interior of the groove ring seal.

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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 steam and condensate switch of a drying machine cylinder of a paper machine according to the invention in a cross-sectional view. Shown is the other end of the drying cylinder of the paper machine.

Figure 2 shows the switch according to the invention in cross-sectional view and on an enlarged scale.

Figure 3 shows point A enlarged from Figure 2.

Figure 4 shows another embodiment of the invention.

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Figure 5A is a front view of the seal.

Figures 5B and 5C show the seal spring.

Figures 6A-6E show different embodiments of the seal.

Figure 1 shows a partial longitudinal pedal sectional view of the drying cylinder. The drying cylinder 10 is supported at both ends by bearings 11.

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 via a flange 10b. The drying cylinder 10 is adapted to rotate on bearings 11.

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.

· '·· 35 The steam is led from the inlet steam pipe 12 to the steam pipe 13 in the direction of the central axis of the drying cylinder ....: X through its end perforation 13a. The flow of steam «* a 85999 from the inlet steam pipe 12 to the steam pipe 13 through its end perforation 13a is shown by the arrow The steam is discharged into the inner space D of the drying cylinder shell 10a as shown by the figure Lj. After the steam has condensed and given off its heat to the drying event, the condensate is collected by a suction tube 14 from a condensate groove 15 on the inner surface of the jacket 10a. Arrow L3 shows the condensate flow 10 out of the 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 the connection of the drying cylinder. Condensate drainage is facilitated by a vacuum pump (not shown). The condensate pipe-15 ki 17 runs inside the steam pipe 13.

Figure 2 shows in more detail a steam and condensate switch according to the invention. According to the invention, the lower coupling enables the introduction of steam and condensate pipes through the shaft pin of the drying cylinder into the blades of the drying cylinder. The coupling enables a structure in which the above-mentioned pipes are located in a fixed position inside the rotating shaft structure surrounding them. The coupling forms a secure pressure-tight connection between the rotating shaft and the fixed coupling structures.

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 condenser pipe 17 running inside the steam pipe 13. The body 21 comprises an inner annular flange portion 23 comprising an annular groove 23 '. for a groove ring seal 24 according to the invention. The inner flange part .. · _ 30 23 is connected by a conical connection 25 to the steam pipe 13 on its outer surface.

An shaft pin 27 is connected to the end flange of the drying cylinder by means of a screw connection 26. The cylinder with its shafts is adapted to rotate on a bearing 11 'with the bearing housing 28 supported on fixed frame structures.

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Through the central bore or the like of the shaft pin 27, the above-mentioned steam and condensate pipes 12, 17 are passed, as well as an insulating pipe 29 fixed at one end to the mounting sleeve 30 and at the other end to a support ring 31 further connected to the central bore of the flange 32. . The flange 32 is further connected by screws 33 to the end of the shaft pin 27.

The body 21 is fastened with screws 34 from the flange 21a to the flange 28b of the bearing housing. The screw connects the body 21 and the flange 28b to the shell part 28a of the bearing housing 28 10 itself.

An inner ring space H is left between the inner flange portion 23 of the body 21 and the outer end of the body 21 and the steam tube 13. The steam tube 13 comprises a perforation 13a, whereby steam can be led through the perforation 15 inside the steam tube 13 and further flow axially towards the cylinder.

The condensate tube 17 is further supported at its outermost end on a ring between the steam tube 13 and the condensate tube 17. A flow indicator 18 is further fastened to the end flange portion 21b 20 of the body 21 with screws from its flange portion 35. The connections between the steam tube 13 and the condensate tube 17 are sealed with o-ring seals.

Figure 3 shows the area X of Figure 2 in more detail.

"·: 25:: As shown in Fig. 3, the wheel support 21 comprises an annular groove 23 in which the groove ring seal 24 according to the invention is placed. The groove ring seal 24 comprises a spring 36 inside the ring 24, the spring 36 being spring-applied to both sides of the groove ring seal. pressing a slip ring 37 attached to the other side of the groove ring seal 24 to a flange 32 fixed to the shaft 27 of the drying cylinder 10 in a flange surface 32a thereof.

'The space C shown in the figure is led inside the groove ring seal.' · 35 The vapor pressure acting between the insulating tube 29 and the steam tube 13 inside the cylinder 10 in the state ____: D. Thus, in the embodiment of the figure, the force required to close the sealing surface between the sealing ring and the flange is provided by the vapor pressure and the spring force of the seal spring 36. If there is a vacuum situation in the cylinder 10, the force 5 required to close the sealing surface 32a between the seal 24 and the flange 32 is provided by the spring force of the spring 36 alone. The slip ring 37 connected to the groove ring seal is preferably of a harder material than the groove ring seal 24 itself and thus wears less. As the material of the sliding ring 37, a wear- and heat-resistant material such as a ceramic, e.g. silicon nitride Si3N * or alumina Al2O3, can be selected.

In the embodiment of the figure, the slip ring 37 is connected to the groove ring seal 24 by gluing. There are other ways of attachment. They are described in the following preferred embodiments of the invention. As the material of the groove ring 24, a flexible and heat-resistant material such as Teflon can be used.

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The solution according to the invention achieves numerous advantages. The installability of the switch is improved because there are fewer parts than in the very difficult-to-maintain solution according to the prior art. The clutch body and the wheel carrier are in one part and the clutch positions are selectable at 45 ° intervals for different steam inlet directions. The use of the wheel carrier as the clutch structure itself also supports the structure and thereby further results in lower vibrations and further reduced seal wear. With the structure according to the invention, the conical attachment can be brought closer to the tip of the catch, whereby the structure can be further supported and the specific oscillation frequency increases and their amplitudes decrease. The structure still allows the support bearing to be removed.

The sealing solution according to the invention has a smaller sliding surface than the carbon ring solution according to the prior art. As a result, less heat is generated by friction. This simplifies the material issue of the insulation ring 0-ring.

The structure according to the invention is easy to install compared to the prior art solution, because the number of parts of the structure is small.

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Figure 4 shows another preferred embodiment of the invention. The circular support 21 comprises a fluid space E in which two groove ring seals 24 comprising a slip ring 37 and a spring 36 are placed. The shaft end flange 32 comprises a separate coupling flange 38 which is located in its fluid space E, preferably in a fluid space. The slip rings of the groove ring seals are adapted to act on both sides of the clutch 38 on its surfaces 38a and 38b. For example, water is introduced into the liquid space E, whereby the pressure provided in it together with the spring force of the springs 36 of the groove ring seals 24 presses the sliding rings 10 of the groove ring seals 24 onto the coupling flange 38. Thus the sealing surface 38a, 38b between the slip ring 37 . The liquid in state E also acts as a barrier.

Figure 5A is a front view of the groove ring seal 24. An annular spring 36 is placed in the inner annular groove C of the groove ring seal 24. In addition, the space C is influenced by the pressure of the medium, e.g. the vapor pressure transmitted from inside the cylinder. The annular spring 36 acts on the second lip 24a of the groove ring seal 24 with a force F and the force required for sealing is further transmitted to the slip ring 37 attached to the lip 24a. The same direction is also acted upon by the additional force provided by the steam pressure. The slip ring 37 is thus pressed onto the sealing surface. This closes the gap between the sealing ring and the flange.

Figure 5B shows a spring 36 to be inserted in the groove C.

Figure 5C shows a spring 36 in cross-section entering the space C of the seal 24 from the side.

Figure 6A shows another preferred embodiment of a seal according to the invention. In the embodiment of the figure, the groove ring seal 24 comprises a slip ring 37 fixed to the spring 36 on both sides of the slip ring 37 by forks 36a and 36b.

Fig. 6B shows an embodiment of the invention in which the slip ring is attached to the second lip 24a of the groove ring seal 24 by means of a groove / tongue connection 85999. The slip ring 37 comprises on both sides a groove 40a in which the shoulder 40b of the groove ring seal 24 rests.

Fig. 6C shows the attachment of the slip ring 37 to the groove ring seal 24 by the dovetail connection 41. The slip ring 37 comprises a dovetail shoulder 41a on its outer circumference, which rests in a correspondingly shaped dovetail groove 41b of the slip ring seal 24.

Fig. 6D shows an embodiment of the invention in which a separate connecting fabric 42 is used to attach the sliding ring 37 to the groove ring seal 24. The connecting fabric 42 is glued to the second lip 24a of the groove ring seal 24 on its outer surface and a sliding ring 37 is glued to the connecting fabric 41. in its groove 23 separate anti-rotation passages 43, of which one is marked in the figure.

Figure 6E shows the use of anti-rotation grooves 44 on the two adjacent side surfaces 45a, 45b of the groove 45 for the groove ring seal 24. In the embodiment of the figure, the slip ring 37 is attached to the groove ring seal 24 by gluing. In addition, a pressure relief mass 46 is applied to the bottom of the groove formed by the spring 36, the function of which is to reduce the internal pressure area without reducing the flexibility of the seal.

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Claims (19)

1. Steam and condensate coupling for the drying cylinder (10) in a paper machine, in which coupling construction leads the steam and condenser tube (13,17) inside the (D) cylinder (10) so that Angan is guided via The abutment (13) and the condensate are deposited via the take-up and condensate tube (14,17) from the space (D) inside the cylinder (10), in which the coupling structure Ang and condensate tubes (13,17) is passed through the shaft pin (27). and in which construction a pressure-tight joint is secured between the rotating shaft (27) and the stationary clutch construction (21) by pressing the seal (24) against the rotating shaft (27) or against the structures Ar connected thereto. and rotates therewith, and said steam and condensate coupling structure comprises a locking seal (24), characterized in that the pressure of a medium can be controlled in the inner locking (C) of the locking seal (24), that the locking seal (24) comprises a spring ( 26) on the inside of the seal and that the seal (24) comprises a sliding ring (37) which is connected to its one flap (24a), which sliding ring (37) is pressed against the rotating face (32a) of the cylinder (10) to be tampered with by the spring force of a spring (36) comprising at least the locking seal (24) and in normal operating conditions using the liquid or vapor pressure introduced into the space (C) within the locking seal (24). The steam and condensate coupling for the drying cylinder (10) of a paper machine according to claim 1, characterized in that the steam and condensate coupling comprises a body (21) or a circular support comprising an internal annular flange part (23) comprising ring groove (23 '), in which the locking seal (24) is placed, and the locking seal comprises a connection to the inner space (C) of the seal (D) of the cylinder (10) so that an impression can be directed to the expression (C) between The socket (13) and an insulating pipe (29), wherein: the seal (24) can be pressed to the rotary with the help of an Evaporator; the surface (32a) of the cylinder to be removed. I * 85999 A steam and condensate coupling for the drying cylinder (10) of a papermaking machine according to claim 1 or 2, characterized in that the locking seal (24) comprises a sliding ring (37) in At least one lip of the locking seal (24), pA. its outer surface, which ring is arranged to press against the moving surface (32a) to be sealed. Steam and condensate coupling according to any of the preceding claims, characterized in that the sliding ring (37) is of harder substance 10 than the retaining seal itself (24). 5. Steam and condensate coupling according to the preceding claim, characterized in that the sliding ring is made of ceramic material. 6. Steam and condensate coupling according to any of the preceding claims, characterized in that the sliding ring is of silicon nitride (SisN *). Steam and condensate coupling according to any one of the preceding claims 1- 5, characterized in that the sliding ring is of alumina (AI2O3). Steam and condensate coupling according to claim 1, characterized in that the round support (21) comprises a medium space (E), in which the rotating coupling flange (38) of the rotating cylinder is partially positioned, and that the coupling structure comprises two latching seals ( 24) on both sides of the coupling flange (38) arranged to be pressed by the resilience of the springs (36) of the locking seals (24) and the fluid pressure introduced by the media space 30 (E) to the surface (38a, 38b) of the coupling flange (38) to be sealed. 9. Steam and condensate coupling according to any one of the preceding claims, characterized in that the pressure of the medium introduced into the space (C) inside the locking seal (24) is proportional to the pressure within the cylinder (10). is 85999 A barrier seal (24) for use in a meadow and condensate coupling, the barrier seal (24) comprising an annular inner space (C), in which an annular spring (36) is placed and which spring is arranged to forcefully pushing both lips (24a, 24b) of the locking seal, characterized in that the locking seal (24) comprises a sliding ring (37) in at least one of its lips (24a), which sliding ring is of harder material than the locking seal itself. -en (24). 10 Sealing according to the preceding claim, characterized in that the seal comprises such a slide ring (37) which is connected by gluing to the outer surface of one lip (24a or 24b) of the locking seal (24). 15 Sealing according to claim 10, characterized in that the seal is secured by bonding to the connecting tissue (42) between the latch seal (24) and the sliding ring (37). Sealing according to claim 10, characterized in that the seal comprises a salmon tail joint (41) or the equivalent between the sliding ring (37) and the seal (24). Sealing according to claim 10, characterized in that the sliding ring (37) is attached to the locking seal (24) with a locking / tapping joint 25 (40). Sealing according to claim 10, characterized in that the slide ring (37) is connected to the spring (36) by the locking seal (24). 30 Sealing according to any of the preceding claims 10-15, characterized in that the sliding ring (37) is of harder material than the locking seal itself (24). Locking seal according to the preceding claim, characterized in that the sliding ring (37) is of ceramic material. ie 85999 Sealing according to the preceding claim, characterized in that the sliding ring is of silicon nitride (Si3N4). Sealing according to any one of the preceding claims 10-17, characterized in that the sliding ring (37) is of alumina (Al2 O3).