EP0992624A1 - Dispositif pour éliminer des courants tourbillonaires - Google Patents
Dispositif pour éliminer des courants tourbillonaires Download PDFInfo
- Publication number
- EP0992624A1 EP0992624A1 EP99112903A EP99112903A EP0992624A1 EP 0992624 A1 EP0992624 A1 EP 0992624A1 EP 99112903 A EP99112903 A EP 99112903A EP 99112903 A EP99112903 A EP 99112903A EP 0992624 A1 EP0992624 A1 EP 0992624A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- constant part
- part according
- pipeline
- swirl
- wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000000835 fiber Substances 0.000 claims description 27
- 239000000725 suspension Substances 0.000 claims description 22
- 230000007704 transition Effects 0.000 claims description 20
- 230000010349 pulsation Effects 0.000 claims description 14
- 238000004140 cleaning Methods 0.000 claims description 9
- 238000011144 upstream manufacturing Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 3
- 230000008719 thickening Effects 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 3
- 239000000123 paper Substances 0.000 description 16
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000004615 ingredient Substances 0.000 description 2
- 239000011505 plaster Substances 0.000 description 2
- 229920000715 Mucilage Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000011111 cardboard Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/06—Regulating pulp flow
- D21F1/065—Shock-absorbing devices
Definitions
- the invention relates to the constant part of a paper or Cardboard machine according to the preamble of claim 1 and a Procedure for avoiding pulsation in the constant part of a Paper or board machine.
- the quality of a finished paper is next to the basic properties, which differ according to the Change the area of application of the paper, essentially through the Uniformity of these properties over the entire area determined away.
- Ingredients e.g. fibers, ash
- the spatial Orientation of the fibers formation or Fiber orientation cross profile
- the inventors have recognized that another cause for the Development of pulsations in the constant part of a Paper machine, especially in the feed lines to Headbox, is that in the outlet area of suspension-bearing containers swirl flows (vortex), mostly in the outlet area of the containers.
- the rotational component of the flow especially if it occurs in the headbox, a unwanted alignment of the fibers are caused, the unfavorable on the uniformity of the formation and on affects the fiber orientation cross profile.
- the inventors therefore propose to avoid pulsations before using the swirl component of the flow Swirl crushers as close as possible to the point of origin or at possible place of origin itself, namely at the outlet area a suspension-carrying container and / or in the subsequent pipeline, to reduce, respectively completely wiped out. It is advantageous to To design swirl breakers in a special way to fiber-containing suspensions no interference Fiber wiping, dirt or mucilage to evoke.
- Positioning is particularly advantageous and effective of a swirl breaker on or in a deculator (Ventilation tank), because this is due to only a small amount Built-in components and large flow spaces are particularly susceptible to is the formation of swirl currents.
- the run-out area has a special form of training of the container has an, at least partially conical, Transition area to a pipeline.
- a particularly advantageous design of a swirl breaker may consist of forming a tube bundle. Since the individual pipes have a smaller diameter than that single large pipe and possibly between the Pipes only have smaller passage areas this measure strongly the formation of swirl currents reduced.
- a variety of tubes can be selected from the tube bundle have at least two different diameters.
- the arrangement of the tubes can be chosen so that the center lines of several tubes of the tube bundle on one - imaginary - cylinder jacket or cone jacket.
- the Swirl breaker from at least one flat plane with finite Thickness d, which is parallel to the main flow direction.
- the thickness d of the plane should be greater than that Length of the longest fibers in the stock suspension, or still better larger than twice the length of the longest fiber in of the stock suspension.
- this level can be defined by a flat sheet metal or formed by a flat plastic element become.
- one side of the level is at a distance from the nearest wall, wherein these are preferably at least twice the middle Correspond to the fiber length of the fibers in the stock suspension should.
- the nearest wall it can be both around the wall of the pipeline as well as the next one act flat level. If the levels are only on one their sides attached to the wall of the pipeline, so there can be a free passage area in the center of the pipeline are maintained for the current in which there is none Levels of the swirl breaker.
- Distance from the not attached side of the level to the next Wall maximum 2/3 of the diameter of the pipeline correspond. With such a configuration several in the main flow direction within the pipeline running, possibly narrow strips with the Inner wall of the pipeline connected.
- the level of the swirl breaker - in cross section seen the pipeline - at the connection to the wall of the Pipe to give a curvature that is continuously in the curvature of the pipe wall passes.
- the level in the area of Connection to the wall of the pipeline on both sides a kink on its surface so that the surface on both sides with an angle ⁇ that is significantly greater than 90 ° is on the curvature or on the surface of the Wall abuts.
- Twist breaker Another advantageous embodiment of the Twist breaker according to the invention is that the upstream narrow edge of the plane to the Flow direction - at least in the edge area to the wall of the Pipeline - has an angle ⁇ greater than 90 °, preferably greater than 135 °.
- the Inventor also proposed to avoid pulsations in the Constant part of a paper or board machine, in Outflow area of a fluid-carrying container and / or in the subsequent pipeline swirl flows, so Rotational flows around a main flow direction avoid.
- Ratio of area flowed through to flow contacted Walls opposite a single pipeline or one single inner cross section of a container can be reduced. This measure on the one hand prevents the emergence of Rotational currents more difficult, as well as existing ones Rotational currents are dampened and even extinguished.
- the outer walls surfaces in contact with the flow in the flow cross-section be introduced. It is particularly advantageous if the Alignment of the surfaces parallel to the main flow direction runs. In this way the rotational component is the Flow directed against these surfaces and is caused by the Surface destroyed or redirected.
- Figures 1a, 1b and 1c show three views of one swirl breaker according to the invention in a pipeline.
- the Swirl breaker 1 consists of one in the main flow direction trending flat level 3 that has an upstream edge 6 has.
- the connection between level 3 and the Wall 7 of the pipeline 2 is through a transition fitting 4 created, which in the edge areas of level 3 Thickening of the plane creates. Due to the design of the Transition fitting 4 form the wall 7 of the pipeline 2 and the transition surfaces of the transition molding 4 upstream an angle ⁇ that is significantly greater than 90 ° is. Because of this angle ⁇ and the gap-free connection with the wall 7 of the pipe 2 is achieved, that none Fiber wiping occurs in this area.
- FIG. 1b shows the section B-B from FIG. 1a shown. In addition to FIG. 1a, they are on both sides the level 3 attached cleaning cover 5 can be seen.
- the level 3 has a thickness d which is greater than the greatest length of the Fibers is in the stock suspension through the pipeline 2 can be transported. This prevents fix individual fibers at edge 6 of level 3.
- Figure 1 b shows the contour of the Transition fitting 4 into the wall 7 of the pipeline 2.
- 1c is the section B-B from FIG. 1a shown.
- This view shows how the Level 3, with the help of the connected transition fitting 4, with a curvature 8 continuously into the curvature of the Wall 7 of the pipeline 2 merges. According to the invention this transition even without curvature with a straight surface occur. Such a situation is in the Enlarged section shown at bottom right.
- the transition fitting has no curvature, but forms a straight surface with an angle ⁇ that is essential is greater than 90 ° to the wall 7 of the pipeline 2 connects.
- FIG. 3a Another embodiment of the swirl breaker is in the Figures 3a and 3b shown.
- the execution of the The twist breaker of Figure 3a corresponds in principle to the Figure 2a.
- levels 3 do not reach Center of the tube and are only on one side connected to the tube wall 7.
- a curvature that is in the curvature of the Pipe wall runs.
- the distance a of the free edges 9 of the Levels 3 is chosen so that there is between them cannot form fiber bridges. According to the invention, this can Distance a be up to 2/3 of the pipe diameter.
- 3b is the section B-B through FIG. 3a shown, the upstream edges of level 3 such are curved that they form without a paragraph in the Pass over wall 7 of tube 2.
- Figure 4 shows a highly schematic excerpt from the Constant part of a paper machine with a deculator 10, that with stock suspension via a feed 20 from one not shown cleaner system is loaded and from which the Stock suspension via a pipeline 12 by a pump 14 is conveyed to a vertical classifier 15.
- the pipeline 12 indicates at the transition from deculator 10 to pipeline 12 conical transition piece 11. From the vertical sifter 15 the stock suspension passes through a further pipeline 13 to a density-controlled headbox 16.
- the dotted area of the deculator 10 is the preferred place for one according to the invention Swirl breaker, which in this example is conical Transition piece 11 is located. Possible designs are both in Figures 1a-3c, and in Figures 5-7 shown.
- FIG. 5 shows the design of a swirl breaker (Section A-A from Figure 4) in a pipeline as a built-in Tube bundle.
- Pipes 17.1, 17.2 and 17.3, each with a different one Diameter shown symmetrical in the actual Pipeline are arranged in the flow direction.
- the Pipe bundle itself is also via webs 18 with the wall 7 of the pipeline connected.
- the tubes 17.1 and 17.2 are with their centers symmetrically dashed on a indicated inner circle arranged, the tubes 17.1 alternate with 17.3. Located centrally between the tubes another pipe 17.3. This arrangement creates a variety of channels, both within the pipes themselves, as well as through the outer walls of the tubes 17.1-17.3 and the Webs 18 formed. Due to the shape of these channels and The increased wall friction will create the swirl currents either prevented or an existing one Swirl flow braked with respect to its rotational component.
- FIG. 5a shows a variant of the configuration of a Swirl crusher according to Figure 5, wherein the intermediate channels between the individual tubes 17.1, 17.2 and 17.3 closed here are.
- the suspension flows exclusively through the Pipes 17.1, 17.2 and 17.3 itself.
- FIGS. 6 and 7 Another form of swirl breaker is shown in FIGS. 6 and 7.
- Figure 6 shows a cross section through a tapered transition piece 11 in which Four levels 3 are arranged in a cross shape, which is general act as additional surfaces in the flow and on which any swirl currents break, or not at all.
- FIG. 7 shows the transition piece 11 accordingly Figure 3 in a longitudinal section.
- the transition piece 11 is in addition to recognize that to avoid pollution and Fiber wiping the upstream edges 6 to Main flow direction 19 are chamfered and thus sticking prevent fibers or dirt.
Landscapes
- Paper (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19845898 | 1998-10-06 | ||
| DE1998145898 DE19845898A1 (de) | 1998-10-06 | 1998-10-06 | Drallbrecher |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0992624A1 true EP0992624A1 (fr) | 2000-04-12 |
Family
ID=7883511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99112903A Withdrawn EP0992624A1 (fr) | 1998-10-06 | 1999-07-05 | Dispositif pour éliminer des courants tourbillonaires |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0992624A1 (fr) |
| DE (1) | DE19845898A1 (fr) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19946575A1 (de) * | 1999-09-29 | 2001-04-05 | Voith Paper Patent Gmbh | Vorrichtung zum Entgasen von Faserstoffsuspension |
| WO2008009719A2 (fr) | 2006-07-21 | 2008-01-24 | Endress+Hauser Flowtec Ag | Système de mesure pour un milieu s'écoulant dans un conduit de traitement |
| DE102007063372A1 (de) * | 2007-12-30 | 2009-07-02 | Endress + Hauser Flowtec Ag | Meßsystem für ein in einer Prozeßleitung strömendes Medium |
| US7882751B2 (en) | 2007-07-19 | 2011-02-08 | Endress + Hauser Flowtec Ag | Measuring system with a flow conditioner for flow profile stabilization |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4080997A (en) * | 1975-09-16 | 1978-03-28 | Sulzer Brothers Limited | Flow straightener for a liquid flow |
| US4238208A (en) * | 1977-11-24 | 1980-12-09 | Ab Celleco | Apparatus for degassing paper stock |
| DE3625566A1 (de) * | 1986-07-29 | 1987-01-02 | Escher Wyss Gmbh | Daempfungsvorrichtung fuer eine fluessigkeitsstroemung |
| US5255716A (en) * | 1988-12-13 | 1993-10-26 | Total Compagnie Francaise Des Petroles | Pipe rectifier for stabilizing fluid flow |
| DE29823401U1 (de) * | 1998-04-30 | 1999-06-17 | Voith Sulzer Papiertechnik Patent GmbH, 89522 Heidenheim | Drallbrecher |
-
1998
- 1998-10-06 DE DE1998145898 patent/DE19845898A1/de not_active Withdrawn
-
1999
- 1999-07-05 EP EP99112903A patent/EP0992624A1/fr not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4080997A (en) * | 1975-09-16 | 1978-03-28 | Sulzer Brothers Limited | Flow straightener for a liquid flow |
| US4238208A (en) * | 1977-11-24 | 1980-12-09 | Ab Celleco | Apparatus for degassing paper stock |
| DE3625566A1 (de) * | 1986-07-29 | 1987-01-02 | Escher Wyss Gmbh | Daempfungsvorrichtung fuer eine fluessigkeitsstroemung |
| US5255716A (en) * | 1988-12-13 | 1993-10-26 | Total Compagnie Francaise Des Petroles | Pipe rectifier for stabilizing fluid flow |
| DE29823401U1 (de) * | 1998-04-30 | 1999-06-17 | Voith Sulzer Papiertechnik Patent GmbH, 89522 Heidenheim | Drallbrecher |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19845898A1 (de) | 2000-04-27 |
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| Date | Code | Title | Description |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT DE FI SE |
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| AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
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| 17P | Request for examination filed |
Effective date: 20001012 |
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| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: VOITH PAPER PATENT GMBH |
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| AKX | Designation fees paid |
Free format text: AT DE FI SE |
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| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
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| 18W | Application withdrawn |
Withdrawal date: 20010405 |