FI90676B - Siphon structure for drying cylinders of a paper machine - Google Patents

Description

90676

Siphon structure of a paper machine drying cylinder Siphon construction for a cylindrical cylinder with a paper mask 5

The invention relates to a siphon structure for a drying cylinder of a paper machine.

Steam is introduced into the drying cylinders of the paper machine through the condensate of the drying cylinders of the paper machine and the central tube structure of the steam switch, and condensate water is collected inside the drying cylinder by means of a siphon as the siphon joins the central condensate tube. Broken siphon pipes in drying cylinders are a fairly common problem. The reasons for the rupture of siphon pipes are the vibrations caused by the condensate load and the consequent fatigue fracture.

In the siphon tube structure according to the invention, the problem is avoided by making the siphon as rigid as possible elsewhere except in the area where the fractures occur. According to the invention, a joint is formed at the problem site. The geometry of the joint is formed so that the end of the siphon cannot collide with the inner wall of the cylinder shell. According to the invention, such flexibility and spring return are formed in the joint that no stresses exceeding the fatigue limit can be created anywhere in the siphon. The elasticity of the joint with respect to the masses of the siphon is chosen such that the amplitude of the siphon support part is minimized in the vibration of the siphon. In addition, in the structure according to the invention, damping is formed in the joint.

The siphon tube structure according to the invention comprises a flange connection, the flanges of which are connected to each other by means of a ball joint. The friction surfaces of the ball joint are pressed against each other by the spring force of the springs arranged in connection with the flange connection.

The siphon structure of the drying cylinder according to the invention is mainly characterized in that the joint comprises a bearing and springs, the spring force of which is provided by pressing the bearing surfaces of the bearing against each other.

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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 target area of the invention and a siphon according to the invention in connection with a drying cylinder.

Figure 2 is a view in the direction of arrow D direction in Figure 1.

Fig. 1 shows a cross-sectional view of the object area of the invention from the drying cylinder 10 of a paper machine. The cylinder shell 10a is rotated on bearing means 11. The steam is introduced through the inlet steam pipe 12 into the space E inside the condensate and steam switch body 14, from where it flows through the perforation 13a as indicated by the arrows Lj into the steam pipe 13 and into the internal space D as indicated by the arrow L1.

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The condensate is collected through the siphon pipe 15 as shown by the arrow Lj and the condensate flows from the siphon pipe 15 to the condenser pipe 16 and further through the flow indicator 17 to the outlet pipe 18.

According to the invention, there is a joint 20 between the siphon tube 15 and the condensate tube 16 according to the invention, in which the movement of the siphon tube 15 is concentrated. In the most common embodiment of the invention, the joint 20 in this application is generally understood as a point where the movement of the siphon tube 15 is concentrated. Thus, within the scope of the invention, an embodiment is possible in which the joint 20 is generally formed of a structure, preferably a tubular structure, which is flexible and where the movement of the siphon tube 15 can be concentrated.

The joint 20 comprises, as shown in the embodiment of Figure 2, springs 21a and 21b, the function of which is to press the bearing surfaces of the articulated ball bearing 26 against each other by the spring force of the springs 30 21a, 21b. The biasing of the springs 21a and 21b also determines the amount of friction damping.

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sifonirakenne the direction of arrow K 1 of Figure 2 shows the invention as seen from the direction. The condensate pipe 16 and the siphon pipe IS comprise flanges 22a and 22b. The flanges 22a and 22b are connected to each other by screws 23a and 23b, which screws 23a and 23b are passed through the perforations 24a and 24b, 25a and 25b of the flanges 22a and 22b. The screws are provided with 5 nuts 26a and 26b. Springs 21a and 21b are arranged between the flange connection 22a and the nut or the like 25a, 25b. The springs 21a, 21b are placed around the screws 23a, 23b. By turning the nuts, the force of the springs 21a, 21b by which the flanges 22a and 22b are pressed towards each other as the spring force is applied to the ball bearing 26 between the flanges is adjustable. red metal spherical ring 27.

The movement of the siphon tube 15 takes place around the pivot center 0 of the ball bearing 26. When the siphon tube 15 rotates, e.g. by the action of the jacket, as shown in the figure, the entire siphon tube 15 rotates around the pivot center 0 of the ball bearing 26. The return of the siphon tube 15 to the original operating position takes place under the action of the spring force of the springs 21a and 21b. The non-vibration of the structure is prevented by damping the ball bearing 26. The damping is determined by the force exerted by the springs 21a and 21b against the counter surface 28 of the flange 21a of the ball bearing 26 against the bearing ring 27.

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Claims (4)

A siphon structure for the drying cylinder of a paper machine, the siphon structure being located in a space (D) within the drying cylinder (10) of the paper machine, in which space is provided for meadow via centrally drawn branch pipe (13) of the condensate and steam connection and from which space (D) inside the cylinder (10) condensate water is collected via a siphon pipe (15) while the condensate is led from the siphon pipe (15) to a condensate pipe (16) and further from the condensate pipe (16) to an outlet pipe (18). ), and the siphon structure includes a hinge (20) between the siphon tube 10 (15) and the condensate tube (16) to concentrate the movement of the siphon tube (15), characterized in that the hinge (20) comprises a bearing (26). and springs (21a, 21b), whereby the bearing surfaces of the springs (26) are pressed against each other with the spring force of the springs. Siphon structure according to claim 1, characterized in that there are flanges (22a, 22b) between the siphon tube (15) and the condensate tube (16) and a ball bearing (26) therebetween, the flanges (22a, 22b) being pressed against each other with a spring force provided by the springs (21a, 21b). 3. A siphon structure according to claim 1 or 2, characterized in that the structure comprises a perforation (24a, 24b; 25a, 25b) in the flanges (22a, 22b) through which guards (23a, 23b) are passed around which the spring frames (21a, 21b) is inserted and pressed between the flange (22a) and the nut (26a, 26b) or the head of the screw, thereby providing a force by means of the spring frames (21a, 21b) with which the flanges (22a, 22b) are pressed against each other and with pressing the spherical bearing surfaces of the ball bearing (26) against each other, thereby providing a dampening of the movement of the siphon tube (15) by biasing the spring frames (21a, 21b). 4. Siphon structure according to any of the preceding claims, characterized in that the ball bearing (26) consists of a ring (27) with a spherical surface and a counter-sphere (28) 6 90676 formed in the flange (22a) with corresponding spherical surface shape which cooperates with this. IN;