FI110132B - Suction roll gasket - Google Patents

Description

110132

The invention relates to a seal for a suction roll.

Wear of suction roll axial seals has proven to be a problem. Wear of water lubrication has been used to prevent wear. However, the difficulty in prior art solutions has been to maintain a suitable lubricating film and to overfill the lubricant pre-10.

This application discloses a new solution for lubricating and loading the sealing strip. The application proposes that the lubricant medium be led to the sealing strip through the channels in connection with the sealing strip and its seat, i.e. the holder. Thus, in solution 15, water is not sprayed onto the sealing strip from the outside of the sealing arrangement, but in the solution water is led to the sealing surface through a separate channel through the bottom or side of the seal holder. The lubricant medium is further introduced into a groove extending the length of the seal on the surface of the seal. It is also contemplated in the invention to use lubricating: ··· medium pressure to press the sealing strip onto the inner surface of the suction roll shell. Thus, 20 solutions do not necessarily require separate loading means, but the pressure of the lubricant medium is utilized to press the seal onto the inside surface of the suction roll.

The invention is characterized by what is stated in the claims.

·. *: 25 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 the invention is not intended to be limited.

· IA::: Y: Fig. 1A is a schematic representation of the suction roll and the suction box inside it.

In accordance with the invention, the lubricant medium is introduced through a separate manifold into the branch passages and further to each of the axial seals in the suction box.

2 110132

Fig. 1B shows a first preferred embodiment of the invention in which the medium, preferably water, is first centrally introduced into the space Dj between the seal and the holder, and thereafter through a separate channel into the groove on the surface of the seal.

Figure 2 illustrates another embodiment of the invention further provided with load hoses.

Figure 3 shows an embodiment of the invention in which the medium is introduced through the side leg of the seal holder.

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Figure 4 illustrates an embodiment of the invention in which the lubricant medium is led through a separate tube to the central fluid space D2 of the seal and further to the groove on the face of the seal.

Fig. 5 illustrates an embodiment similar to Fig. 4, except that the lubricant medium is introduced into the center space D2 of the seal from the side of the seal.

Figure 6 shows an embodiment of the invention which otherwise corresponds to the embodiment of Figure 2 except that the seal is lockable by a separate locking means in its holder. Prior to this, the seal is pressed onto the inner surface of the jacket by the pressure of the lubricant medium, and preferably also by the pressure of the load lines, from which the pressure can be relieved after the locking means are provided, preferably by the locking piston.

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Figure 7 illustrates an embodiment of the invention which otherwise corresponds to that of Figure 6, except that the loading hoses are omitted and the loading is effected solely by the pressure of the lubricant medium.

Fig. 1A is a partially schematic view of a suction roll 10 using a sealing strip according to the invention. The suction roll 10 comprises a roll jacket 11 and a perforation 11a ^ 1 ^ ...

Inside the suction roll, there is a suction box 12, by means of which the vacuum created in the internal space D is used to draw water from the perforation llaj, 11a 2 ··· of the rolled web shell 11.

3 via 110132. As shown in Fig. 1A, the lubricating medium, preferably water, is led through the manifold 13 and the branch pipes 14aj, 14a2, 14a3 ... to the seals 15 ', 15 ". The seals 15; 15", or so-called. the axial seals are used to keep space D under vacuum and prevent leakage through the suction box peripheral areas formed by the seals. The gaskets 15 ', 15 "are located in their holders 16', 16" and are ribbed portions extending over the entire length of the roll 11.

In the cross-sectional pattern of the seal shown perpendicular to the longitudinal axis of the seal and perpendicular to the longitudinal axis of the suction roll, the structure comprises a seal 15 in its holder 16. The holder 16 is a U-profile 10 comprising a web portion 16a and pot 16c. Intermediate spaces Cj, C2 are formed between the base 16c and the leg portions 16bj and 16b2, into which the seal 15 extends from its leg portions 15bj, 15b2. The gasket 15 comprises a web portion 15a from which downwardly extending branch portions 15bj and 15b2-Medium channel 18a through which a lubricating medium, preferably water, is introduced to the gasket. The channel 18a is connected to the suction box 15 12, its channel 18aj. The channel extends through the web 16a of the holder 16 as a conductive channel 18a2 and further to the cap 16c as a conductive channel 1Sa ^. The lubricant medium, preferably V: water, is introduced into the space Dj formed between the legs 16c and the web portions 15aj of the seal 15a and the legs 16c. From said space, Dj is in the channel 19 »·, |, ß in the groove 20 at the face 15 'of the seal 15.

0-1 20.,! Thus, when the medium is introduced into the space D j, a force is applied to the underside of the seal v * to raise the seal and at the same time the medium is introduced into the groove 20 at the seal face 15 '.

Thus, the medium has two functions, a lubrication function and a seal moving function.

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»* · * · '· The gasket 15 is provided with a head face 15' against the inner surface 11 'of the sheath 11 of the suction roll 11 and at the same time acts by force and holds the gasket at the inner surface 1Γ of the suction roll 11.

Fig. 2 shows another embodiment which otherwise corresponds to the embodiment of Fig. 1B, but the structure is provided with separate loading means, preferably loading portions 30a 20a, 20a2. Loading lines 20a1, 20a2 are conventionally adapted to act on the branch portions 15bj of , 15b2päätyihin. Preferably, the loading hoses 20a ^, 2 (^) are compressed air-loaded.

Figure 3 illustrates an embodiment of the invention in which lubricating means 5 are introduced into space Dj through a passage 21 on the side of the branch portion 15bj of the seal 15. The passage 21 opens into the space Dj and at the same time to the outer surface of the sealing branch portion 15bj. The lubricant medium is introduced through the conduit 22 into the bore 23 of the gasket holder 16 into the bore 23 of its branch portion 16bj. As the conduits 21 and 23 are aligned, the grease medium, preferably water, moves from the conduit 22 to the duct 23 and further through the in the groove 20 of the face 15 '.

Figure 4 illustrates an embodiment of the invention in which a sealed space D2 is formed in the center of the gasket 15 having a separate channel, preferably a tube 26. The tube 26 extends into the cap 16c of the holder 16. Preferably, the tube 26 is attached to either the gasket 15 or 15 in the cap 16c. If the tube 26 is attached to the gasket 15, the slider fitting is provided between the tube 26 and the hole 27c of the cap 16c, and if the tube 26 is attached to the socket 16c, the slider fit is fitted between the tube 26 and the hole 28 of the gasket 15. The embodiment of Figure 4 is provided with loading hoses 20a1, 20a2, preferably compressed air load hoses, respectively, as shown in the embodiment of Figure 2. Lubricant: Preferably, water is introduced through conduit 29 into conduit 26 and further into space D2. From D2 ...! The lubricant medium is passed through a channel 19 to a face 15 'of the seal 15 via a groove 20.

»1«> »·» * · »· ·; Fig. 5 illustrates an embodiment similar to Fig. 4, except that the lubricant medium 25 is introduced into the central space D2 of the gasket sideways through the channel 31 of the gasket side plate 30. The side plate passage is provided with a flexible lubrication medium • I · '* · · # import tube 32. The import tube 32 is guided to the seal via an opening 33 in the branch portion 16b2 v, of the holder.

In the embodiment shown in Fig. 6, the device arrangement is further provided with locking means 36, preferably a locking piston, which comprises a pneumatic 5110132 loading hose 37 and associated movable piston member 38 as depicted in the figure. The device solution further comprises loading hoses 20aj, 20a2 by which the seal 15 is pressed against the inner surface 1Γ of the suction roll 11 before locking. The arrangement for importing the lubricant is similar to that of FIG. 5, for example.

Fig. 7 otherwise shows the embodiment of Fig. 6 except that there is no loading means 20a, 20a2 for pressing the seal 15 on the inner surface 1Γ of the sheath. In this embodiment, the seal is pressed onto the inner surface of the jacket by the pressure of a lubricant medium, preferably water 10, acting in space D on the inner surface A 1 of the web 15a of the seal 15

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Claims (8)

6, 110132 A seal (15) for the suction roll (11) disposed in the holder (16) and the seal (15) being arranged as an axial seal for the suction box (12) of the suction roll (11) to seal the interior space (D) of the suction box (12) sucked from a paper web or the like through a perforation (11a1, 11a2-- ·) of the suction roll (11) to a suction box (D) which is vacuumed against the atmosphere outside the suction box (12) and that suction box (12) the axial seal (15) comprising water lubrication wherein the lubricant medium is led through a separate channel (19) adjacent the seal (15) to the front face (15 ') of the seal 10, characterized in that the lubricant medium is led under pressure to the seals (15) a space (Dj) between the holder (16) where it acts by force on the surface of the seal (15) and presses the seal (15) against the inner surface (11 ') of the roll shell, whereby the lubricating medium acts as n to apply force to the seal to press it against the inside surface of the roll shell. 15 Seal according to Claim 1, characterized in that the lubricant medium is water and that the lubricant medium is conducted through a channel (19) for the lubricant medium which is separate from the space (Dj) between the seal (15) and its holder (16). a seal face (15 ') and a groove (20) therein. • · • · t 20 • · · Gasket according to the preceding claim, characterized in that the groove (20) is I I 1 '!!! adapted to extend along the entire length of the seal and is preferably fitted to the front edge of the seal when viewed in the direction of rotation of the roll (11). · · • · ·. ···. Seal according to one of the preceding claims, characterized in that. the seal comprises a passage (18,18aj, 18a2,18a3) through which the lubricating medium is centrally guided into the space (16c) between the web portion (15aj) of the seal (15) and the cradle (15bj, 15b2) and the holder (16c) Dj), into which a channel (19) formed in the web portion (15a) of the seal (15) is opened, which further opens into the groove (20) on the face (15 ') of the seal (15). 7, 110132 Suction roll seal according to Claim 1, characterized in that a lubricating medium and, at the same time, a loading medium, are introduced into the space (Dj) between the web portion (15a) of the seal and the holder (16c) through the channel (21) in the branch portion (15bj). (21) is further guided through the channel (23) in the branch portion (16bj) of the holder (16) to the lubricant medium and also the loading medium. Suction roll seal according to Claim 1, characterized in that the lubricant medium is led along a separate conduit (26) to a separate medium space (D2) in the middle of the seal (15), which has a channel (19) on the seal face (15 '). 10 that the tube (26) leading to the space (D2) is further connected to the holder (16) via a socket (16c) in its web portion (16a) and that the tube (26) is slidably fitted to either the gasket (15) or socket (16c); there are separate loading hoses (20aj, 20a2) by means of which the seal (15) is pressed into the inner surface (1Γ) of the roll shell of the suction roll (11). Suction roll gasket according to claim 1, characterized in that the gasket (15) comprises a central closed space (D2) into which the lubricant medium is introduced from the side of the gasket via a separate flexible or flexible channel (32). Suction roll gasket according to one of the preceding claims, characterized in that the gasket further comprises locking means (36), preferably a loading hose and a piston part, by means of which the gasket (15) can be locked in its holder (16). · j. is first pressed against the inner surface (1Γ) of the suction roll (11) when sealing. · * · * · * 1 * · • I »• · 110132 s