EP1378674A2 - Heizwalze und Verfahren zu ihrer Herstellung - Google Patents
Heizwalze und Verfahren zu ihrer Herstellung Download PDFInfo
- Publication number
- EP1378674A2 EP1378674A2 EP03014211A EP03014211A EP1378674A2 EP 1378674 A2 EP1378674 A2 EP 1378674A2 EP 03014211 A EP03014211 A EP 03014211A EP 03014211 A EP03014211 A EP 03014211A EP 1378674 A2 EP1378674 A2 EP 1378674A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- liquid
- heating roller
- heat
- heat transfer
- channel
- 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.)
- Granted
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Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
- D21G1/02—Rolls; Their bearings
- D21G1/0253—Heating or cooling the rolls; Regulating the temperature
- D21G1/0266—Heating or cooling the rolls; Regulating the temperature using a heat-transfer fluid
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
- D21F5/022—Heating the cylinders
Definitions
- the invention relates to a heating roller with a body, which is provided with pins at its axial end and has peripheral bores by a first heat transfer medium are flowable.
- the invention further relates to a method of making a heat roller with a body, the peripheral bores and pins on the Has ends of the body.
- a heating roller of the type mentioned is out DE 199 57 847 C1 known.
- Heating rollers are used, for example, in production a paper web, a certain amount of heat in the Enter paper web to heat them up when they are passes through a nip or nip that passes through the Heating roller is limited.
- the heating roller is multiple arranged in a calender that is also more than can have a nip.
- the heating roller is heated in that a Heat transfer through the peripheral holes in the body flows.
- the body is often designed as a tube, the peripheral holes are arranged in its wall are.
- insulation sleeves are often in the part of the peripheral Drilled holes that are not in the area the paper web width. For example, this is off the aforementioned DE 199 57 847 C1 known. In order to it is prevented that the roller in the edge area high flow temperatures, at which correspondingly large Amounts of heat are given off to the paper web Edges heated up too much. There is namely Possibility of heat dissipation not to the same extent. The insulating sleeves thus cause thermal expansion the roller at the axial edges avoided.
- the invention has for its object a heating roller operate with different flow temperatures to be able to.
- This task is the one mentioned at the beginning of a heating roller Art solved in that in at least one Tenon a heat transport assembly with a movable second heat transfer medium is provided with the heat can be transported from radially outside to radially inside.
- the tenon becomes not sufficiently heated.
- the pin is in the Area where he is in contact with the first heat transfer medium or at least so closely adjacent to the areas of the body is that brought up from the first heat transfer medium Heat also reaches the cones to an elevated temperature brought. This temperature increase is enough not enough to extend the spigot as much as a whole, that he can follow the expansion of the body. If you now additionally a heat transport arrangement with a second Provides heat transfer, then you can solve this problem deal in an elegant way. You are no longer satisfied with heat conduction through the tenon, which usually is present because the pin is made of a metallic and thus heat-conducting material is formed.
- This configuration is particularly preferred if Insulating agent in the area of the ends of the peripheral bores are provided. In this case it turns out the problem of the lack of heat transfer from the body on the pin especially because of the axial end less heat is then applied to the body.
- the heat transport arrangement is preferably dependent the temperature of the first heat transfer medium controllable. With this configuration you achieve that heat transfer at a higher flow temperature of the first heat transfer medium reduced or even prevented can be. So you combine the advantages of one reduced peg heating at higher flow temperatures with stronger cone heating at lower ones Flow temperatures of the first heat transfer medium.
- the heat transport arrangement preferably has a plurality in the spigot radially extending channels that into one Center area of the pin are guided.
- radial does not necessarily mean that the channels in the manner of radial jets to the roller axis are led. It is sufficient if it is from the outside radially are guided radially inwards. Here you can also a certain angle with radial rays include the roller.
- the move second heat transfer medium so that it absorbs heat outside and can deliver inside.
- the channels are preferably the peripheral bores arranged closely adjacent. This is the heat transfer from the first heat transfer medium to the second heat transfer medium facilitated.
- the first heat transfer medium and the second heat transfer medium are separated from each other by only a little material. So you can on the one hand separate media for use the first and second heat transfer media, on the other hand but ensure good heat transfer.
- the peripheral bores preferably extend into the cones. This has several advantages. To the one can then deflect the Cause current of the first heat transfer medium. On the other hand can be achieved in this way that the first heat transfer medium touched the pin and on a relatively large Area. This in turn facilitates the heat transfer from first heat transfer medium in the pin.
- the channels preferably contain an evaporable one Liquid.
- the heat is then transported by that the liquid in the warmer places, that is radial outside, is evaporated and in the cooler places, So radially inside, condensed again with the emission of heat.
- the liquid is then driven by the centrifugal force the roller, which when operating on the liquid acts, again thrown radially outwards where it can be heated again.
- the liquid preferably has one in the channel Boiling point that is below a minimum flow temperature of the first heat transfer medium. This ensures that the liquid can evaporate when the first heat transfer medium supplies the pin with heat.
- the boiling point depends on the liquid itself, but also from the pressure in the channel. One can hence, for example, an adjustment using the pressure of the boiling point.
- Each channel preferably has a radially outer one Limit on that in the area of the outer radial limit the peripheral holes.
- Limitation can be formed, for example, by a stopper be used from the outside in the channel to close the channel.
- each channel Contain liquid from a predetermined Flow temperature of the first heat transfer medium completely evaporated. If the first heat transfer medium has a low flow temperature, then it transmits accordingly, only a little heat on the roll neck. This heat is then released through the vaporizable liquid transferred radially inwards so that the pin is better heated overall. However, this effect is only required at low flow temperatures. At higher flow temperatures should not be so much Heat can be entered into the cone. If you now only fill so much liquid that this liquid completely above a predetermined flow temperature evaporates of the first heat transfer medium, then lies second heat transfer medium above this flow temperature in Gaseous form.
- the one described above switches Heat transfer with the help of the second heat transfer medium automatically turn off because the gas is a very bad one Is heat conductor. It is still a certain heat transport take place by convection. Because this convection but no longer associated with a forced flow is like evaporation of the liquid the heat transfer is extremely low.
- the channels completely with the second heat transfer medium are filled, which is below a predetermined Temperature partly in liquid and partly in is in gaseous form.
- a predetermined Temperature partly in liquid and partly in is in gaseous form.
- the task is in a method of the aforementioned Art solved in that radial channels in creates the cone, into this an evaporable liquid introduces and seals them.
- the vaporizable Liquid then forms the second described above Heat transfer medium with which it is possible to heat radially to be transported outside radially inside, so that at low flow temperatures of the first heat transfer medium, which is passed through the peripheral holes Heat transport takes place in the cone itself, which leads to a uniform heating of the peg and thus to one uniform expansion of the cone and the body leads.
- the liquid has a gas phase
- By heating the cone will at least make the liquid partially evaporated and so long until it expired has pushed out of the channel. If you look at the channel after that closes, the channel is completely with the second Filled with heat transfer medium, partly in liquid Form and partly in gaseous form.
- the mass of the introduced Liquid is determined and the mass of the escaping Liquid is determined and when a predetermined difference between the masses the channel closes. This is a relatively easy way make sure the channel after making contains a predetermined mass of the liquid. As stated above, this mass is such that above a predetermined flow temperature of the first The liquid evaporates completely is.
- a roller 1 has a body 2, which acts as a tube is trained.
- the roller 1 has a surface 3 that should be heated.
- Body 2 arranged a plurality of peripheral bores, which are evenly distributed in the circumferential direction are. In the present case, twelve holes 4 are provided, the with a distance of 30 ° in the circumferential direction are arranged.
- a first heat transfer medium preferably a liquid, such as hot water or hot Oil, or a gas, such as steam, can be supplied.
- the roller has 1 pin 5 on its end faces.
- the pin 5 has a stub shaft 6, with the Help the roller in a roller machine, for example a calender that can be rotated. in the the rest of the pin 5 is substantially flat.
- the outer diameter of the pin 5 is correct here Case practically with the outer diameter of the body 2 match. But it is also possible that the pin 5th a slightly smaller diameter than the body 2 has.
- a recess 7 which is used to deflect the first heat transfer medium from a peripheral bore 4 in an adjacent peripheral hole is provided. If the first heat transfer medium through only one peripheral hole 4 is passed, it is a mono pass roller. If the first heat transfer medium is through a peripheral Hole 4 there and through an adjacent peripheral hole is returned, then one is called one Roller as a duo-pass roller. It is also possible, that the heat transfer medium through two peripheral holes one direction and through another peripheral hole is headed in the opposite direction before he leaves the roller 1 again. In this case acts it is a tri-pass roller.
- an insulating sleeve 8 is provided in each case. Through the Insulating sleeve 8 is a heat transfer from the heat transfer medium from the peripheral bore 4 in the body 2 of the Roller 1 reduced.
- a plurality of channels 9 are arranged in the pin 5, which, 1, radially to the axis 10 extend. However, it is not absolutely necessary that the channels 9 parallel to radial beams run to axis 10.
- the channels 9 are closed radially on the outside by plugs 11.
- the radial inside of the plug 11 is located roughly where the radially outer Location of the peripheral bore 4 is located.
- a liquid 12 is filled into each channel 9.
- the situation in the company is shown, where the Roller rotates.
- the liquid 12 due to the centrifugal force against the stopper 11 pressed, is therefore at the radially outer end of channel 9.
- the insulating sleeves 8 in the axial end of the peripheral bores 4 introduced, that is, in the Part of the holes 4, which is not in the range of the width is a paper web that is treated with the heating roller 1 becomes.
- the Roll with high temperature a relatively high proportion the heat to the paper web. This heat emission is missing where the paper web (not shown) on the Roller rests. Accordingly, without the Insulating sleeves 8, the pin 5 and the adjacent area of the body 2 heat up strongly. This would become one cause thermal expansion of the roller 1 at the edges. This thermal expansion is due to the insulating sleeves 8 avoided.
- roller 1 If the roll neck 5 is too cold, there is a constriction the roller 1 at the edges, i.e. at the axial ends. This leads to thick paper web ends.
- the liquid 12 allows the supply of heat to strengthen the pin 5 and only at low Flow temperatures of the first heat transfer medium. at high flow temperatures should the heat supply through the installed insulating sleeves 8 are reduced.
- the liquid 12 forms a second heat transfer medium, which is separated from the first heat transfer medium by the peripheral Bores 4 flows, can work.
- the liquid 12 is a fluid that has a boiling point below the minimum flow temperature of the first heat transfer medium Has. Commercially available are particularly suitable for this Refrigerants e.g. at atmospheric pressure Have a boiling point of approx. 30 ° C.
- the channels 9, which are designed as radial blind holes are as close as possible to the peripheral bores 4 or the recesses 7, the one redirection point between two neighboring peripheral Form holes in the pin 5. This will be a best possible heat transfer from the first heat transfer medium reached on the liquid 12. As stated above is due to the rotation of the roller Centrifugal forces the liquid 12 always radially outer end of the channel 9 and thus in the immediate vicinity Proximity of the heat supply through the first heat transfer medium.
- the liquid 12 is thus at higher temperatures boil in the closed channel 9. However, it evaporates only as much liquid until the pressure in channel 12 increased to the temperature and pressure-dependent boiling pressure is. The evaporated liquid condenses on the colder surfaces towards the center of the pin 5, whereby the pressure drops again and becomes the boiling liquid 12 supplied. Through this cycle (Evaporating-condensing), the so-called "Heat pipe effect" is heat directly from the cold center of the cone fed.
- the channels 9 are in one middle area, i.e. they extend to the inside of the wave end 6.
- the mass of the liquid filled dimensioned so that above a defined Flow temperature of the first heat transfer medium the entire Liquid 12 has evaporated, so the whole in one Channel 9 filled mass is in the gaseous state.
- the described one switches Heat transfer automatically starts because the gas is a very bad heat conductor.
Landscapes
- Rolls And Other Rotary Bodies (AREA)
- Rollers For Roller Conveyors For Transfer (AREA)
- Devices For Checking Fares Or Tickets At Control Points (AREA)
Abstract
Description
- Fig. 1
- eine schematische Querschnittsansicht durch einen Zapfen einer Walze und
- Fig. 2
- eine schematische Längsschnittansicht eines Ausschnitts aus einer Walze.
Claims (16)
- Heizwalze mit einem Korpus, der an seinem axialen Ende mit Zapfen versehen ist und periphere Bohrungen aufweist, die von einem ersten Wärmeträger durchströmbar sind, dadurch gekennzeichnet, daß in mindestens einem Zapfen (5) eine Wärmetransportanordnung mit einem bewegbaren zweiten Wärmeträger (12) vorgesehen ist, mit der Wärme von radial außen nach radial innen transportierbar ist.
- Heizwalze nach Anspruch 1, dadurch gekennzeichnet, daß im Bereich der Enden der peripheren Bohrungen (4) Isoliermittel (8) vorgesehen sind.
- Heizwalze nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Wärmetransportanordnung in Abhängigkeit von der Temperatur des ersten Wärmeträgers steuerbar ist.
- Heizwalze nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Wärmetransportanordnung mehrere im Zapfen radial verlaufende Kanäle (9) aufweist, die bis in einen Mittenbereich des Zapfens (5) geführt sind.
- Heizwalze nach Anspruch 4, dadurch gekennzeichnet, daß die Kanäle (9) den peripheren Bohrungen (4) dicht benachbart angeordnet sind.
- Heizwalze nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß sich die peripheren Bohrungen (4) in die Zapfen (5) hinein erstrecken.
- Heizwalze nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß die Kanäle (9) eine verdampfbare Flüssigkeit enthalten.
- Heizwalze nach Anspruch 7, dadurch gekennzeichnet, daß die Flüssigkeit (12) im Kanal (9) einen Siedepunkt aufweist, der unterhalb einer minimalen Vorlauftemperatur des ersten Wärmeträgers liegt.
- Heizwalze nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß jeder Kanal (9) eine radial äußere Begrenzung (11) aufweist, die im Bereich der äußeren radialen Begrenzung der peripheren Bohrungen (4) liegt.
- Heizwalze nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, daß in jedem Kanal (9) eine Masse der verdampfbaren Flüssigkeit (12) enthalten ist, die ab einer vorbestimmten Vorlauftemperatur des ersten Wärmeträgers vollständig verdampft ist.
- Heizwalze nach einem der Ansprüche 5 bis 10, dadurch gekennzeichnet, daß die Kanäle (9) vollständig mit dem zweiten Wärmeträger (12) gefüllt sind, der unterhalb einer vorbestimmten Temperatur teilweise in flüssiger und teilweise in gasförmiger Form vorliegt.
- Verfahren zum Herstellen einer Heizwalze mit einem Korpus, der periphere Bohrungen und Zapfen an den Enden des Korpus aufweist, dadurch gekennzeichnet, daß man radiale Kanäle in den Zapfen erzeugt, in diese eine verdampfbare Flüssigkeit einführt und sie verschließt.
- Verfahren nach Anspruch 11, dadurch gekennzeichnet, daß man, wenn die Flüssigkeit eine Gasphase aufweist, die ein höheres spezifisches Gewicht als Luft aufweist, vor dem Verschließen eines Kanals den Zapfen beheizt.
- Verfahren nach Anspruch 11, dadurch gekennzeichnet, daß man, wenn die Flüssigkeit eine Gasphase aufweist, die ein geringeres spezifisches Gewicht als Luft aufweist, den Kanal vollständig füllt, den Zapfen beheizt und ausströmende Flüssigkeit ableitet.
- Verfahren nach Anspruch 13, dadurch gekennzeichnet, daß man die Masse der eingeleiteten Flüssigkeit ermittelt und die Masse der ausströmenden Flüssigkeit ermittelt und bei Erreichen einer vorbestimmten Differenz zwischen den Massen den Kanal verschließt.
- Verfahren nach Anspruch 13 oder 14, dadurch gekennzeichnet, daß man den Kanal bei Erreichen eines vorbestimmten Dampfdrucks verschließt.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10230037 | 2002-07-04 | ||
| DE2002130037 DE10230037B9 (de) | 2002-07-04 | 2002-07-04 | Heizwalze und Verfahren zu ihrer Herstellung |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1378674A2 true EP1378674A2 (de) | 2004-01-07 |
| EP1378674A3 EP1378674A3 (de) | 2005-10-19 |
| EP1378674B1 EP1378674B1 (de) | 2007-08-22 |
Family
ID=29719458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20030014211 Expired - Lifetime EP1378674B1 (de) | 2002-07-04 | 2003-06-25 | Heizwalze und Verfahren zu ihrer Herstellung |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1378674B1 (de) |
| DE (2) | DE10230037B9 (de) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19957847C1 (de) | 1999-12-01 | 2001-06-07 | Schwaebische Huettenwerke Gmbh | Walze zur thermischen und mechanischen Behandlung eines bahnförmigen Produkts |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3014891A1 (de) * | 1980-04-17 | 1981-10-22 | Schwäbische Hüttenwerke GmbH, 7080 Aalen | Vorrichtung mit einer mittels eines waermetraegers temperaturgeregelten hohlwalze |
| DE4317873C2 (de) * | 1993-05-28 | 1994-04-21 | Voith Gmbh J M | Hohler Walzenkörper zur Verwendung in einer Papiermaschine oder dergleichen Anlage zur Herstellung endlosen Bahnmaterials |
| DE19511086A1 (de) * | 1995-03-25 | 1996-09-26 | Schwaebische Huettenwerke Gmbh | Dampfbeheizte Walze mit Kühlung |
| DE19513500C2 (de) * | 1995-04-10 | 1998-05-14 | Schwaebische Huettenwerke Gmbh | Walze mit einstellbarer Form |
| DE19538236A1 (de) * | 1995-10-13 | 1997-04-17 | Schwaebische Huettenwerke Gmbh | Heizwalze |
| DE29622957U1 (de) * | 1996-05-23 | 1997-09-25 | Eduard Küsters Maschinenfabrik GmbH & Co KG, 47805 Krefeld | Beheizbare Walze |
| DE19819072C1 (de) * | 1998-04-29 | 1999-08-19 | Voith Sulzer Papiertech Patent | Dampfbeheizte Walze |
-
2002
- 2002-07-04 DE DE2002130037 patent/DE10230037B9/de not_active Withdrawn - After Issue
-
2003
- 2003-06-25 EP EP20030014211 patent/EP1378674B1/de not_active Expired - Lifetime
- 2003-06-25 DE DE50307992T patent/DE50307992D1/de not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19957847C1 (de) | 1999-12-01 | 2001-06-07 | Schwaebische Huettenwerke Gmbh | Walze zur thermischen und mechanischen Behandlung eines bahnförmigen Produkts |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1378674B1 (de) | 2007-08-22 |
| EP1378674A3 (de) | 2005-10-19 |
| DE50307992D1 (de) | 2007-10-04 |
| DE10230037B9 (de) | 2004-10-21 |
| DE10230037A1 (de) | 2004-01-29 |
| DE10230037B4 (de) | 2004-05-27 |
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