CN209958151U

CN209958151U - Insulation arrangement for a drying cylinder of a web forming machine and drying cylinder of a web forming machine

Info

Publication number: CN209958151U
Application number: CN201920570096.3U
Authority: CN
Inventors: 泰穆·耶姆森; M·劳里凯宁
Original assignee: Valmet Technologies Oy
Current assignee: Valmet Technologies Oy
Priority date: 2018-05-08
Filing date: 2019-04-24
Publication date: 2020-01-17
Anticipated expiration: 2029-04-24
Also published as: DE202019102458U1; FI12106U1

Abstract

An insulation structure for a drying cylinder of a web forming machine and a drying cylinder of a web forming machine, the insulation structure (35) being adapted to be fastened with an end sealing device (22) on a journal (13) assigned to the drying cylinder (10) equipped with a channel (16) in order to lead out steam and condensate, such that the insulation structure (35) is provided with an air gap (23) in the channel (16) and is arranged in an area where a support device (14) is adapted around the journal (13), wherein an insulation nipple (21) and an inner nipple (24) are assigned to the insulation structure (35), which are adapted with a distance (25) to each other.

Description

Insulation arrangement for a drying cylinder of a web forming machine and drying cylinder of a web forming machine

Technical Field

The subject matter of the invention is an insulation structure for drying cylinders of a web forming machine, which is adapted to be fastened with end seals on journals provided with channels, which are assigned to the drying cylinders, for the purpose of conducting off steam and condensate, so that the insulation structure is arranged in the region of the bearing means which has an air gap relative to the channels and which is adapted around the journals. The subject of the invention is also a drying cylinder of a web forming machine.

Background

A steam coupling is arranged on the fiber web machine for feeding steam into the drying cylinder. The steam coupler is coupled to a hollow journal of the cylinder, around which journal the support device is arranged. Here, the drying cylinder is rotated by means of a journal, wherein the bearing arrangement and the steam coupling do not rotate. The steam coupler is a channel in which two pipes are arranged. Steam is fed through a first pipe and condensate overflows the drying cylinder through a second pipe. A separating structure is also assigned to the drying cylinder, which separating structure is sealed to the channel at both ends. In this case, an air gap remains between the separating structure and the journal for the separation.

A problem in today's thermal insulation solutions is a too large and fast heat transfer from the supported shaft journal to the supporting device. Because of the rapid heating, the support device is damaged more quickly than usual.

SUMMERY OF THE UTILITY MODEL

The object of the invention is to provide a new insulation structure for the drying cylinders of a web forming machine, the insulation performance of which is better than hitherto. The features of the isolation structure according to the invention are clear in the present invention. Furthermore, it is an object of the invention to provide a new drying cylinder of a web forming machine, the bearing arrangement of which is longer in life than hitherto. According to the utility model discloses a characteristic of dryer is clear in the utility model discloses. With the insulation structure according to the invention, the insulation performance can be easily improved, wherein damage due to the heating of the supporting means can be avoided. The insulation structure can also be fitted to existing drying cylinders without great effort. Furthermore, the isolation properties can be varied case-specifically, wherein sufficient isolation can also be provided in the most difficult to handle locations.

In particular, the invention proposes an insulation structure for a drying cylinder of a web forming machine, which is adapted to be fastened with an end seal on a shaft journal, assigned to the drying cylinder, equipped with a channel, in order to lead off steam and condensate, such that the insulation structure is provided with an air gap in the channel and is arranged into the area, to which a bearing arrangement is adapted around the shaft journal, wherein an insulation nipple and an inner nipple are assigned to the insulation structure, which are adapted to have a distance from each other.

Preferably, the spacing is equal to or greater than the air gap.

Preferably, the spacing is arranged as a closed space between the isolating nipple and the inner nipple.

Preferably, the closed space is filled with an isolating material.

Preferably, an additional nipple is assigned to the isolating nipple, which additional nipple is adapted to be spaced apart from the inner nipple.

The invention also proposes a drying cylinder of a web forming machine, around which a bearing arrangement and an insulation structure are arranged, in order to lead off steam and condensate, a shaft journal equipped with a channel is assigned to the drying cylinder, which insulation structure is fitted into the channel with an end seal, which channel has an air gap in the region of the bearing arrangement, wherein an insulation connection pipe and an inner connection pipe are assigned to the insulation structure, which insulation connection pipe and inner connection pipe are adapted to have a distance to each other.

Drawings

The invention is described in detail below with reference to the accompanying drawings, which illustrate an application of the invention, in which:

fig. 1 shows in cross-section a drying cylinder of a fiber web machine according to the known art;

fig. 2 shows an insulation structure according to the invention fitted to a drying cylinder of a fiber web machine;

fig. 3 shows an isolation structure according to the invention in cross section.

Detailed Description

The end of a drying cylinder 10 of a web forming machine according to prior art is partially shown in fig. 1. Associated with the cylinder 10 is a shell 11, an end 12 and a hollow journal 13 coupled to the end 12. The journal 13 has a bearing arrangement 14 to enable rotation of the cylinder 10. A non-rotating steam coupling 15 is provided as a continuation of the journal 13. The hollow journal 13 defines a cylindrical passage 16 for directing steam and condensate into and out of the cylinder 10. In this channel 16, a steam pipe 17 and a condensate pipe 18, both of which do not rotate, are additionally arranged coaxially and fittingly. For the tubes mentioned, a steam connection 19 and a condensate connection 20 are located in the steam coupling 15.

In the application of fig. 1, an insulation structure 35 is also associated with the cylinder 10. The separating structure 35 is fitted with the end seal 22 into the channel 16, which has an air gap 23 in the region of the bearing 14. The separating structure and the air gap together form a separating layer in the channel, whereby the heating effect of the hot steam on the support device should be reduced. In the present invention, an isolating nipple 21 and an inner nipple 24 are assigned to the isolating structure 35, which are adapted to have a distance 25 (fig. 2) from one another. Here, a second isolation layer is formed on the isolation structure, which significantly improves isolation. Heating and subsequent damage to the support means can thus be avoided.

In fig. 2 is shown that the insulation 35 according to the invention is fastened on the shaft journal 13. The insulation structure is intended for a drying cylinder of a web forming machine. In general, the insulation 35 is adapted to be fastened with the end seal 22 on the shaft journal 13 associated with the cylinder 10 equipped with the channel 16 in order to conduct away steam and condensate. The separating structure is mounted such that it reaches with an air gap 23 into the channel 16 into the region of the bearing 14 that fits around the journal 13. In the present invention, an isolating nipple 21 and an inner nipple 24 are assigned to the isolating structure 35, which are adapted to have a distance 25 from one another (fig. 3). The additional insulation thus formed reduces the heating of the support device and thus extends the service life of the support device.

Advantageously, this spacing 25 is equal to or greater than said air gap 23. Thereby, the isolation layer remains substantially the same. While avoiding excessive reduction of the channel diameter. The steam pipe and the condensate pipe fit well into the insulating connection. The steam pipe 17 is shown in fig. 2 with a dashed line and the steam flow is shown with an arrow shown to the left. A condensate pipe 18 is arranged coaxially in the steam pipe 17. The condensate line 18 is shown with a dot-dash line and the condensate flow is shown with an arrow shown to the right.

In fig. 3 an isolation structure 35 according to the invention is shown. In this case, the end seal 22 simultaneously forms a fastening means with which the insulating nipple 21 is fastened together with the inner nipple 24 on the shaft journal. Advantageously, this spacing 25 is arranged as a closed space 25 between the isolating nipple 21 and the inner nipple 24. With this closed structure, hot steam is prevented from reaching between the insulating nipple and the inner nipple and the insulating performance of the insulating structure is prevented from being deteriorated. On the other hand, a desired substance or a desired material may be fitted into the closed space. In general, the closed space 26 is filled with an isolating material 27, which is only partially shown in fig. 3. Air also acts as a barrier. Alternatively, air may be conducted out in order to establish a vacuum, or air may then be replaced with another gas, for example argon or nitrogen. It is also possible to fill the closed space with a solid or liquid substance or a mixture thereof. For example, vermiculite is an excellent barrier, it is inexpensive and it retains barrier properties under hot and humid conditions.

In the embodiment of fig. 3, the isolating nipple 21 and the inner nipple 24 are tubes arranged in a staggered manner, which are advantageously made of acid-resistant steel. The tubes are substantially the same length, but they are arranged with a slight overlap. This makes manufacture easy. The inner flange 28 has a projection 29 to which the isolating stub 21 is welded and which centers the inner flange 28 in the channel 16 (fig. 1). Accordingly, the inner nipple 24 is welded to the inner flange 28, to a stop present in the inner bore 30. Here, an air-tight end is formed, which closes the closed space. The inner flange 28 is then fastened to the journal 13 by means of bolts (fig. 2). If necessary, sealing means are used between the inner flange 28 and the journal 13.

The other ends of the tube are also welded to each other in order to form a gas-tight seal. An intermediate sleeve 31 is used which holds the tubes spaced apart from each other and to which the tubes are welded. The outer flange 32 is dimensioned according to the insulating nozzle 21 such that an axial movement is possible between the insulating nozzle 21 and the outer flange. The fastening thus allows thermal movements of the insulating nozzle to be isolated without causing breakage. The sealing of the running seam is ensured by means of an annular sealing device 33. The outer flange 32 is also fastened to the journal 13 with bolts (fig. 2).

If necessary, an additional nipple 34 is arranged on the isolating nipple 21, said additional nipple being adapted to be spaced apart from the inner nipple 24 (fig. 3). Thereby obtaining a new barrier layer and simply improving the barrier properties. A plurality of additional nipples can also be used, wherein a multi-shell insulation structure is produced. Generally, one or more insulation spaces are arranged on the insulation structure. It is advantageous to obtain a closed embodiment from the mentioned space or spaces, for example by welding.

It was confirmed in experiments and tests that the insulation structure equipped with two tubes was already significantly better than the old structure. Furthermore, the isolation may be improved by using an appropriate isolation material. The insulation material is protected between the pipes or connecting pieces and, on the other hand, is prevented from falling out into the surroundings. The use of an insulating structure can reduce the heating of the support means and can thus generally eliminate damage, since the temperature of the support means is kept significantly lower than in known solutions. At its simplest, the spacer structure is an insert which is fastened with a flange on the passage of the journal. In an advantageous embodiment, a closed space on the steam side is arranged on the insulation structure. The insulating nipple and the nipple associated with the insulating structure are fastened not only to each other but also to the shaft journal by means of flanges. At the same time, the isolating nipple and the nipple form a closed and isolated space. Furthermore, a sufficiently large connection is formed, as a result of which the steam pipe and the condensate pipe are led into the drying cylinder and out of the drying cylinder.

Claims

1. An insulation structure for drying cylinders of a web forming machine, which insulation structure (35) is adapted to be fastened with an end sealing device (22) on a journal (13) assigned to the drying cylinder (10) equipped with a channel (16) in order to lead off steam and condensate, so that the insulation structure (35) is provided with an air gap (23) in the channel (16) and is arranged in an area where a support device (14) is adapted around the journal (13), characterized in that an insulation nipple (21) and an inner nipple (24) are assigned to the insulation structure (35), which insulation and inner nipple are adapted with a distance (25) to each other.

2. The insulation structure according to claim 1, wherein the spacing (25) is equal to or larger than the air gap (23).

3. An insulation construction according to claim 1, characterized in that said spacing (25) is arranged as a closed space (26) between said insulation nipple (21) and said inner nipple (24).

4. An insulation construction according to claim 2, characterized in that the distance (25) is arranged as a closed space (26) between the insulation nipple (21) and the inner nipple (24).

5. An insulation structure according to claim 3, characterized in that the closed space (26) is filled with an insulation material (27).

6. An insulation structure according to claim 4, characterized in that the closed space (26) is filled with an insulation material (27).

7. The insulation structure according to any one of claims 1 to 6, characterized in that an additional nipple (34) is assigned to the insulation nipple (21), which additional nipple is adapted to be spaced apart from the inner nipple (24).

8. Drying cylinder of a web forming machine, to which drying cylinder a journal (13) equipped with a channel (16) is assigned, around which journal a bearing arrangement (14) and an insulation structure (35) are arranged, which insulation structure is fitted into the channel (16) with an end seal (22), which channel has an air gap (23) in the region of the bearing arrangement (14), characterized in that an insulation nipple (21) and an inner nipple (24) are assigned to the insulation structure (35), which are fitted with a distance (25) to each other.

9. A cylinder according to claim 8, characterized in that the insulation structure (35) is an insulation structure according to any of claims 2-7.