FI61931C - Sealing structure for drying cylinder steam coupling device. - Google Patents

Description

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Patent and Registration Office (44) Nihttvtk * lp »non ja heard.Julltilwn pvm. - 30.06.02

Patent · och regicterstyrelsan v 'Anfökan utlagd och utLskrifton publkand (32) (33) (31) Pyydetty «tuolkaus — Begird prlorltet (71) (72) Eero Artturi Irpola, Tuureporinkatu 13 E, 20100 Turku 10,

Suomi-Finland (FI) (7 * 0 Oy Jalo Ant-Wuorinen Ab (5 * 0 Sealing structure of the steam switch for drying cylinders - Tätningskonstruktion för torkcylindrars angkopplingsanordning

The present invention relates to a sealing structure between rotating steam line parts which are used, for example, in the inlet of the heating steam of a cylinder dryer of a paper machine or a similar machine.

The above-mentioned cylinder dryer apparatus consists of a series of rotating cylinders on the surface of which the fibrous web to be dried is guided. The thermal energy required for drying is most commonly conducted as heated steam to the cylinder, from the inlet line of its axis of rotation, and removed therefrom as condensate. Various device implementations for introducing steam into a cylinder and removing condensate are known to those skilled in the art and are not per se within the scope of this invention. One such apparatus is shown by way of example in the accompanying Figure 1.

In such steam conduction devices, sealing slides are always created between the rotating cylinders and shafts and the fixed bearing housings and steam pipelines, the seals of which must withstand the thermal stresses caused by the pressurized steam as well as the mechanical stresses caused by the movement.

2 61931

In these devices, the rotating metal surfaces are usually sealed in such a way that the surfaces of special cast iron are ground smooth and an annular seal of suitable material is installed between them, the sliding surfaces corresponding to the metal surfaces of which are also ground to reduce friction. To improve the tightness of the seal, a spring or bellows load can also be used to compress the sealing surface, as shown, for example, in Figure 1.

The known sealing structures have the disadvantage that the sealing ring has to rub against its two surfaces against the cast iron surface under very abrasive conditions. In this case, very high smoothness is also required for cast iron sliding surfaces and their grinding becomes expensive. This refinement has also renewed due to wear, quite often, about half of the episodes are probably quite common.

The main object of the invention is to eliminate the disadvantages of the above-mentioned known sealing structures, in which two annular metal surfaces rotating coaxially with respect to each other, perpendicular to the axis of rotation and opposite to each other are sealed by a sealing member between the surfaces. The above-mentioned advantageous effect is achieved by the sealing structure according to the invention simply in that the sealing member is formed of two sealing rings fixed to opposite metal surfaces, preferably by means of fastening pins projecting from the metal surface and corresponding fastening holes or recesses in the sealing rings. interface. In this case, the friction between the two seal-ring surfaces is negligible with respect to the friction between the seal and the metal. The sliding then takes place on the surface with the lowest friction, i.e. between two sealing surfaces.

An exemplary simple embodiment of the invention will be explained in more detail with the aid of the accompanying Figures 2-5.

Figure 2 is a sectional view of an embodiment of the invention.

Fig. 3 shows Fig. 2 in the plane of the sliding surfaces of the seals.

Fig. H is an enlarged detail of a seal and an embodiment of its attachment to metal surfaces.

Figure 5 shows a detail of the fastening according to Figure 4.

In the embodiment according to Figure 2, the end of the drying cylinder is indicated by reference numeral 1. I end up on the surface to be sealed

Claims (2)

3 61931, a sealing ring H is fixed, which slides in sealing contact as the cylinder 1 rotates with a sealing ring 4 'fixed to the fixed bearing housing 3. In this case, the steam can be led through the space 6 to the cylinder and correspondingly removed through said space by means of various unspecified device implementations (see Fig. 1). Figures 4 and 5 show in more detail a fastening of the sealing ring to the cylinder surface 1 and the fixed bearing surface 3. Slightly oval holes in the diameter direction are made in the sealing ring (Fig. 5), from which the ring is supported by press-fit pins 5 framework. One feasible fastening method is to machine the support grooves suitable for the tire on metal surfaces, whereby the seals remain in place under the frictional forces. In particular, the structure according to the invention makes it possible to substantially extend the service life of the seal, since the abrasion between the metal and the sealing material is eliminated. Furthermore, the very expensive grinding required by special cast iron machine parts is avoided, which in addition must be repeated frequently in older structures in order to obtain an adequate seal. Mixtures of polytetrafluoroethylene (PTFE) can be used as the sealing ring material. Examples of these alloys are the PTFE-carbon-graphite alloy in which the largest material component is PTFE. Another suitable alloy is a composition of matter containing 60% bronze and 40% PTFE. 1. In the sealing structure of the steam clutch of the drying cylinders of the drying section of paper, board and pulp machines, in the structure two annular metal surfaces rotating coaxially with respect to each other, perpendicular to the axis of rotation and opposite to each other are sealed by a sealing member, formed of two sealing rings (4, 4 ') fixed to opposite metal surfaces (1, 3), preferably by means of fastening pins (5) projecting from the metal surface and corresponding fastenings in the sealing rings.