Nozzle of a Device for Contact - Free Treatment of a Running Fiber Web

Abstract

A nozzle (10) for contact-free treatment of a running web, having a main frame (11) forming an outer part of the nozzle, and two side chambers (14, 15) on each of the longitudinal sides of the nozzle (10). The side chambers having openings (17A, 17B, 16A, 16B) for the air to blow toward a fiber web. A U-shaped air channel (20), through which the air is lead to the side chambers (14, 15), located between the side chambers (14, 15), having at least one opening (19, 18) on each side wall for leading the air into the side chambers (14, 15). A U-shaped inner part (13) which is movable by a mechanism (12) comprising a screw (21) and bushings (22) to at least partially open and close the opening (18, 19).

Claims

1. Nozzle of a device for contact-free treatment of a running web, comprising: a main frame part forming an outer part of the nozzle and having portions which face the web, and wherein the main frame has two longitudinal sides extending in a longitudinal direction across the running web, the main frame having portions forming two side chambers one on each of the two longitudinal sides of the main frame part, each side chamber having at least one a nozzle opening for air to blow towards the fiber web; wherein each of the two side chambers have portions forming a first opening facing a corresponding one of the two longitudinal sides of the main frame part; wherein the main frame part has an inner upper surface between the two longitudinal sides; wherein the main frame defines a U-shaped air channel through which air is lead to the side chambers, the U-shaped air channel located at least partially between the two side chambers and having two downwardly inner side walls joined by the inner upper surface, each side wall having portions forming at least one first opening for leading air into one of the two side chambers; a U-shaped inner part located at least partially inside the main frame part in the U-shaped air channel, U-shaped inner part and having two downwardly extending side walls joined by an outer upper surface, each side wall having portions forming at least one second opening for leading air into one of the two side chambers; at least one adjustment mechanism between the inner upper surface of the main frame part and the outer upper surface of the U-shaped inner part; wherein the at least one adjustment mechanism comprises, a first threaded bushing welding to the main frame part inner surface, a second bushing welded to the U-shaped inner part outer upper surface and a screw connecting the first bushing and the second bushing so that rotation of the screw opens and closes, at least partially, an air passage through at least one of two side chambers first openings and one of the side wall second openings for leading air into at least one of the two side chambers.

2. The nozzle of claim 1 further comprising a plurality adjustment mechanism spaced apart in the longitudinal direction along the main frame of the nozzle.

3. The nozzle of claim 1 wherein the nozzle forms a beam which extends in the longitudinal direction.

4. The nozzle of claim 1 wherein the screw is rotatable to changed the distance between the outer upper surface of the U-shaped inner part and the inner upper surface of the main frame part.

5. The nozzle of claim 1 wherein the side wall second openings of the U-shaped inner part are of different sizes so that air flow into the two side chambers is different.

6. The nozzle of claim 1 wherein at least one of the two side chambers has at least two nozzles opening for air to blow towards the fiber web.

7. The nozzle of claim 6 wherein at least two nozzles opening for air to blow towards the fiber web are arranged to blow air in diverging directions.

8. The nozzle of claim 1 wherein portions of the two longitudinal sides of the main frame engage and are slidable along the U-shaped inner part, two downwardly extending side walls to seal the mainframe to the U-shaped inner part.

9. The nozzle of claim 1 wherein the main frame has portions forming an opening over each screw so that the screw can be turned from the main frame part portions which face the web.

10. The nozzle of claim 1 wherein the main frame part is divided into a plurality of segments which are each adjustable by one of a plurality of adjustment mechanisms.

11. The nozzle of claim 1 wherein the main frame U-shaped air channel through which air is lead to the side chambers has an inner U-shaped liner which extends upwardly from at least one mounting flange and lines, and forms part of the inner upper surface and the two longitudinal sides of the main frame.

12. The nozzle of claim 11 wherein the U-shaped inner part is located at inside the main frame part in the U-shaped air channel and the U-shaped inner part downwardly extending sides do not extend to the at least one mounting flange.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIGS. 1A-1B is a schematic view of a nozzle according to an advantageous example of the invention as a cross section view.

[0031] In FIG. 2 is shown a schematic example of a nozzle according to an advantageous example of the invention as a longitudinal view and

[0032] In FIG. 3 is shown a schematic example of an advantageous application of nozzles according to an advantageous example of the invention in an air turn device of a fiber web production line.

[0033] In FIG. 4 is shown another schematic example of a nozzle according to an advantageous example of the invention as a cross section view.

[0034] In FIG. 5 is shown schematically the example according to FIG. 4 in a perspective view.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0035] During the course of this description like numbers and signs will be used to identify like elements according to the different views which illustrate the invention. Repetition of some reference signs have been omitted in the figures for clarity reasons.

[0036] As shown in FIGS. 1A-1B the nozzle 10 comprises a main frame part 11 that forms the outer part of the nozzle 10. The main frame part 11 comprises two side chambers 14, 15 on each longitudinal side of the nozzle 10. Each side chamber 14, 15 comprises nozzle openings 16A, 16B, 17A, 17B for the air blow towards the fiber web (not shown) perpendicularly 16A, 17A and by inclined blows 16B, 17B. The main frame part 11 comprises between the side chamber 14, 15 an air channel 20 through which the air is lead to the side chambers 14, 15. The air channel 20 is formed U-shaped and its side walls have openings 18, 19 for leading the air into the side chambers 14, 15. Inside the main frame part 11 a U-shaped inner part 13 is located. Between the upper surfaces of the main frame part 11 and the U-shaped inner part at least one adjustment mechanism 12 is located for adjusting the location of the side walls of the inner part 13 to open or to close the openings 18, 19 of the main frame part 11 as shown in the FIGS. 1A-1B. In FIG. 1A the openings 18, 19 are fully open so that air is passed from the air channel 20 to each of the side chambers 14, 15 and through each nozzle opening 16A, 16B, 17A, 17B as shown by arrows in the FIG. 1A. In FIG. 1B where the openings 18 and 19 are of different sizes the distance between the upper surfaces of the main frame part 11 and the U-shaped inner part 13 has been adjusted such that the opening 19 on the left hand side in the figure is fully closed and the opening 18 on the right hand side in the figure is partially opened thus air is passed to the right hand side in the FIG. 1B located side chamber 15 and through the nozzle opening 16A, 16B as shown by the arrows in the FIG. 1B. The nozzle 10 may comprise the nozzle openings 16A, 16B, 17A, 17B a single or a double slot opening or advantageously there are several substantially circular nozzle openings 16A, 16B, 17A, 17B located spaced apart in at least one line extending substantially in longitudinal direction of the nozzle 10. In FIG. 2 is shown the nozzle 10 as a longitudinal view. The nozzle 10 comprises the main frame part 11 and its side chambers 14; 15, one of which can be seen in this longitudinal side view of the nozzle 10, and the inner part 13.

[0037] There is at least one adjustment mechanism 12 for adjusting the curvature of the nozzle 10, advantageously, as shown in FIG. 2, there are several adjustment mechanisms 12 located apart in the longitudinal direction of the nozzle 10. As can be seen from the figure the nozzle 10 is formed as a longitudinally extending beam like structure. As shown in the figure by dashed line 23 which illustrates mechanical shape of nozzle 10, when the curvature of the nozzle is adjusted by the adjustment mechanism 12. Thus the distance between the upper surface of the U-shaped inner part 13 and the upper surface of the U-shaped part of the main frame part 11 is adjusted to form a spreader. Correspondingly the distance of the nozzle's 10 upper surface from the surface of the fiber web can be adjusted. The amount of air can also be adjusted so there is more air in the middle of the nozzle.

[0038] In FIG. 3 is shown an air-turn device 25 of a fiber web production line constructed by the nozzles 10 according to the invention. As can be seen the nozzles 10 are located next to each other in curved positions, the curvature can further more accurately be adjusted by the adjustment mechanisms 12 of the nozzles 10.

[0039] In FIG. 4 is shown another advantageous example of the nozzle 10 comprising a main frame part 11 that forms the outer part of the nozzle 10. The main frame part 11 comprises two side chambers 14, 15 on each longitudinal side of the nozzle 10. Each side chamber 14, 15 comprise nozzle openings 17A, 16A for the air blow towards the fiber web (not shown) perpendicularly.

[0040] The main frame part 11 comprises between the side chambers 14, 15 an air channel 20 through which the air is lead to the side chambers 14, 15. The air channel 20 is formed U-shaped and its side walls have openings 18, 19 for leading the air into the side chambers 14, 15. Inside the main frame part 11 a U-shaped inner part 13 is located. Between the upper surfaces of the main frame part 11 and the U-shaped inner part at least one adjustment mechanism 12 is located for adjusting the location of the side walls of the inner part 13 to open or to close the openings 18, 19 of the main frame part 11. In FIG. 4 the openings 18, 19 are fully open so that air is passed from the air channel 20 to each of the side chambers 14, 15 and through each nozzle opening 17A, 16A as shown by arrows in FIG. 5. In this example the nozzle 10 comprises several substantially circular nozzle openings 16A, 17A located spaced apart in one line for each side chamber 14, 15 extending substantially in longitudinal direction of the nozzle 10. There is at least one adjustment mechanism 12 for adjusting the curvature of the nozzle 10, advantageously, as shown in FIG. 5, there are several adjustment mechanisms 12 located apart in the longitudinal direction of the nozzle 10. As can be seen from FIG. 5 the nozzle 10 is formed as a longitudinally extending beam like structure. The curvature of the nozzle 10 can be adjusted by the adjustment mechanism 12. Thus the distance between the upper surface of the U-shaped inner part 13 and the upper surface of the U-shaped part of the main frame part 11 is adjusted. Correspondingly the distance of the nozzle's 10 upper surface from the surface of the fiber web can be adjusted.

[0041] According to the present invention the nozzle 10 can be formed as a welded construction, and comprises a U-shaped inner part 13 and a main frame part 11 between which the adjustment mechanism 12, comprises a screw 22 and bushings 21, the bushings are attached by a welding, one to the main frame part and one to the U-shaped inner part 13 in FIGS. 1A and 1B. The bushings 21 which are welded to the main frame 11 are threaded and the bushings 21 which are welded to the U-shaped inner part 13 are attached to the screw 22 so that the screw can rotate but is retained in the bushing so that rotation of the screw 22 raises or lowers the U-shaped inner part. When the screw is turned the inner U-shaped part 13 opens/closes the openings 18, 19 in the side walls of the main frame part 11 by movement of corresponding openings 18A and 19A in the U-shaped part as shown in FIG. 5, whereby the air blows can be regulated without changing the height of the nozzle 10. As shown in FIG. 1B the holes 18A and 19A may be of different sizes. Advantageously there can be also dividing plates (not shown) provided in order to divide the nozzle into sections in longitudinal direction of the nozzle, i.e. in cross-direction of the direction of travel of the fiber web. In case the nozzle is divided into sections by the dividing plates, each section is advantageously provided with its adjustment mechanism and thus each section can be adjusted individually. The nozzle 10 may comprise cross screws (not shown) with movement clearance attached between the walls of the inner U-shaped part 13 by which the bending of the nozzle 10 can be adjusted in travel direction of the fiber web.

[0042] The main frame 11 part forming an outer part of the nozzle 10 and has portions 30 which face the web, and wherein the main frame has two longitudinal sides 32 extending in a longitudinal direction across the running web. The two side chambers 14, 15 are located one on each of the two longitudinal sides 32 of main frame part 11. The two side chambers have portions forming an opening facing 18, 19 a corresponding one of the two longitudinal sides 32 of main frame part 11. The main frame part has an inner upper surface 34 between the two longitudinal sides 32. The main frame defines a U-shaped air channel 20 through which air is lead to the side chambers 14, 15 and two downwardly extending inner side walls 36 joined by the inner upper surface 34, each side wall having at least one first opening 18, 19 for leading air into one of the two side chambers 14, 15. The U-shaped inner part has two downwardly extending side walls 38 joined by an outer upper surface 40, each side wall having portions forming at least one second opening 42 for leading air into one of the two the side chambers 14, 15. The adjustment mechanism 12 is between inner upper surface 34 of the main frame part 11 and the outer upper surface 40 of the U-shaped inner part 13. The main frame part may be divided into a plurality of segments 44 which are each adjustable by one of a plurality of adjustment mechanisms. FIG. 4 shows an inner U-shaped liner 46 which extends upwardly from at least one mounting flange 48 and lines, and forms part of the inner upper surface 34 and the two longitudinal sides 32 of the main frame 11.

[0043] In this description and the following claims by fiber webs are meant, for example, paper and board webs.