DE1775394A1 - Heatable or coolable roller - Google Patents

Description

KALLE AKTIENGESELLSCHAFT 1775394 Umm * Zildiwi day Matt K 1836 / Qbm 38OI PP-Dr.Kn.-df July 16, 1968

Description for the registration of

KALLE AKTIENQESELLSCHAPT Wiesbaden-Biebrieh

for a patent on a heatable or coolable roller

The invention relates to an old liquids or condensable vapors heatable or coolable roller, with the largely balanced surface temperature _; are doors to achieve ssur using, for example, '\ for Trocknung3vorgänge and in the production of film, paper and textile webs.

An important requirement that must be made of heated and cooled rollers is that of the highest possible temperature compensation, i.e. a low one Temperature gradient across the entire surface of the Walsen.

10 * 821/0911

BAD ORiGMNAL KALLE AKTIENGESELLSCHAFT 1775394

K 1856 / Qbro 38OI PP-Dr.Kn.-df July 16, 68 -rfS

The balanced temperature is necessary in order to avoid undesirable different properties of the treated materials across the width of the web. For example, the ¹ different degrees of dryness during the drying of paper webs or the mechanical properties that vary over the web width during heating and cooling during the production of plastic films may be mentioned here.

There has therefore been no lack of attempts to construct heatable or coolable rollers with which a surface temperature that is as uniform as possible can be achieved is.

As the simplest construction, roller designs are known in which the heating or coolant is about a hollow roller leg through a fixed one Tube fed and removed again via the hollow roller limb. The discharge can also be over the 2nd roller leg or over both roller legs »In each case one arises in the orphans Longitudinal flow directed to one side or the other of the roll or from the center of the roll to both Roll ends is geriohtet.

100828/0818

ORIGINAL BATHROOM

KALLE AKTIENGESELLSCHAFT 1775394 Untare 2MdMn Toi

K 1836 / Qbm 38OI PP-Dr.Kn.-df 7/16/68

With every flow of a liquid, however, the release or absorption of heat causes a temperature drop or rise, which inevitably results in an uneven temperature control of the roller surface. This temperature gradient can be kept low by very large amounts of liquid, but A would only reach the value zero with an infinitely large liquid flow rate. However, in practice, for structural reasons and because of the need to use technically complex units, there are narrow limits to increasing the amount of liquid passed through. Another deficiency is the technical inefficiency of the constructions mentioned.

A roller instead of a liquid with einge- "blasenem steam überdrucklos, ie when using clay steam as the heat carrier at temperatures up to max. Heated 100 ⁰ C, so there is the problem of uniform temperature in intensified form, since the vapor portion to the Roller wall, partly condensed in the roller sump, where even with even distribution of the steam over the length of the roller, a considerable temperature profile develops, which is also dependent

109828/0918

KALLE AKTIENGESELLSCHAFT 1775394 Our Zeldien Ta « S

K 1836 / Gbm 3801 PP-Dr.Kn.-df 16.7.68 -) Γ-

of the amount of steam used .

In other roller designs, heating or cooling coils or several adjacent in the roller bodies built-in pipes distributed over their circumference are used, but these can be used Constructions also do not achieve even surface temperatures, as they are in the direction of of the flow course also always forms a temperature profile.

From the USA patents 1,820,074 and 2,015,747 and French patent 43 ** 455, rollers are known which have concentric displacement bodies built into the roller body, the outer diameter of which is sometimes only slightly smaller than the inner diameter of the roller body. This results in a narrower flow cross-section, as a result of which higher flow speeds can be achieved, as a result of which the heat transfer, which is already high in liquids, can be further improved. The formation of a temperature gradient along the direction of flow but also can not be avoided with these structures.

109828/0918

BATH

KALLE AKTIENGESELLSCHAFT 1775394

ι Ztlditn day

K 1836 / Gbm 38OI FP-Dr.Kn.-df 16.7-68

In a modification of the mentioned roller constructions, DBP 1 178 201 is a roller that can be heated or cooled for calender or rolling mills known whose displacement body is conical, the diameter increases in the direction of flow of the heating medium. Due to the decreasing flow cross-section and the resulting The inevitable drop in temperature is supposed to increase the flow velocity in the direction of the flow the heat transfer, which also increases with increasing flow velocity, is compensated for. However, since the temperature drop of the heating medium according to a linear function, the heat transfer as a function of the flow velocity runs according to an exponential function, the desired temperature compensation is in the changing conditions of the practice, e.g. changing humidity of the dry material, Change in the absolute roller temperature, not possible.

In the magazine "Das Papier", 21st year, issue 10, 1967> a further roller construction is described in which the heating or cooling fluids are inside the roller by means of an axial pump wheel, which is driven from the outside, at high speed

109828/0918

KALLE AKTIENGESELLSCHAFT 1775394

To «« Z «M ·« Tog J

K 1836 / Gbm 38OI PP-Dr.Kn.-df July 16, 68 - € -

be rolled. With this construction , temperature fluctuations on the roll surface are avoided with sufficiently large amounts of circulation, but the external drive of the pump wheel is technically complex and requires additional units.

The object was thus to create a heatable or coolable roller that does not have the shortcomings and disadvantages of the constructions mentioned and with which an optimal temperature equalization on the roller surface is achieved by intensive circulation of the heating or coolant inside the roller .

The above-mentioned object is achieved by a heatable or coolable roller in the form of an outer hollow cylinder, which is mounted on one or both sides in hollow shafts through which the heating or cooling medium enters and / or exits via a tube guided through the hollow shaft and which inside contains a circulating device for the heating or cooling medium and which is characterized in that the circulating device of the roller consists of one or two arranged at a distance a , with fixedly connected to the end faces of the outer hollow cylinder, coaxially arranged as

109828/0918

KALLE AKTIENGESELLSCHAFT 1775394 Lower Zeldien Day

K 1836 / Gbm 38OI FP-Dr.Kn.-df 7/16/68 '- * -

There is hollow cylinder acting on guide elements, the flow-generating conveying elements and passage openings wear for the flowing medium on the sides facing the end faces and that the pipe for the supply of the heating or cooling agent has outlet openings, which are preferably at the same distance from the center the roller are arranged.

When the roller is rotated, the inside with the hollow cylinder on the outside makes the roller rigid connected circulation device achieves intensive and continuous circulation of the heating or cooling medium, As a result, without significant technical effort such as additional external drive on the surface itself long rollers a balanced surface temperature can be set.

When the roller is in operation, a feed pipe which is guided through a hollow roller leg, the heating or cooling medium, for example water, steam, Oil, among other things, is fed to the roller and emerges from the bores of the inlet pipe. The liquid sump is detected when the roller is rotated by the hollow cylinders provided with conveying elements and in the direction of the

109828/0918

KALLE AKTIENGESELLSCHAFT

Longitudinal whale axis shifted. Öifc case of a tung, check on the extending length Ganee hollow cylinder consists 4 üiru as "medium over the entire WaXzenlänge in
the space between outside and

postponed. At the end of the roll dag medium flows through the passage openings and ittnel * s det hollow cylinder in Itthern uhd back over the ietfete on entgegehg ^ end located Durchtrittsöffriürtgen nieäe; ** in deh space between the circulating device and (did äuseeren hollow cylinder.

In another embodiment, SiMi ί are of the same size and inner hollow cylinders of equal length Mounted at a distance from each other.

The heating or coolant is discharged through a hollow shaft, with either the same hollow tube * through which the supply pipe led lit * ι or einfc befiiidliejtifc on the opposite side of the orphan Hollow shaft is used.

The conveying organs can be inclined Sehauf el-Fl & ehen be that so over the circumference of the ddep eier Höh3.gyllnder must be distributed so that the requirement of a continuous flow generation is met.

KALLE AKTIENGESELLSCHAFT 1775394

• Unwr · Z «k ** n To«

K 1336 / Gbm 38OI FP-Dr.Kn.-df 7/16/68

In a preferred embodiment, however, the conveying organs are Helical helix, as the delivery rate per roller revolution is predetermined with good accuracy can be and because their production is particularly easy.

The direction of the back and forth flow of the medium depends on the direction of rotation of the roller and the direction of incline the funding bodies. The conveying organs can have incline directions in the same direction, whereby one forward and one return flow direction is generated. However, this type of arrangement is preferred applied to a circulating device consisting of a single continuous inner hollow cylinder.

In the case of an arrangement of two inner hollow cylinders, in a preferred embodiment the conveying elements have opposing ones Slope direction. This results in circulation currents running in opposite directions towards the center of the roller. The advantage of such an arrangement is in that the circulation is divided into 2 partial flows, which mix again in the middle of the roller.

Albeit some leeway in defining the

109828/0918 BAD OR] QIMAL

KALLE AKTIENGESELLSCHAFT 177539!

«V Unff» d To «g

K 1836 / Gbm 38OI FP-Dr.Kn.-df 7/16/68 -

Cross-sectional area of the circulation device, based on that of the roller, i.e. the outer hollow cylinder, it has been shown in practice that the best Results in terms of a low-loss flow with minimal pump work can be achieved if the cross-sectional areas for both directions of flow are the same or nearly the same.

The situation is similar to that described above with regard to the cross-sections of the passage openings in relation to the cross section of the circulation device. Although there is a certain range of variation in this ratio is possible, there are rollers »whose passage openings have a cross-sectional sum that is at least equal to the cross section of the circulation device, as particularly favorable.

If the circulation device consists of two inner hollow cylinders, so these are at a distance a from each other assembled. The two partial flows mix in the space between the two hollow cylinders, if the hollow cylinders are provided with counter-rotating flow-generating conveying organs, Uli Minimal Um-

109828/0918

BADOÄJNAL

KALLE AKTIENGESELLSCHAFT 17/5394

/ A UM «* ZiMm Tat Ρ ·»

K 1836 / Gbm 3801 PP-Dr.Kn.-df 16.7.68 -ϊί.

To achieve steering losses of the flows, the distance a between the hollow cylinders is in a preferred embodiment chosen to be at least twice as large as the cross section of the passage openings.

The bores in the feed pipe through which the heating or coolant enters the roller should preferably be made at the same distance from the center of the roller, especially when two inner hollow cylinders are arranged, in order to ensure that the medium is fed in largely evenly To achieve distribution. The number of bores is not restricted in this case; rather, a number exceeding two is even preferred. In a further embodiment, for the reasons given above, holes of the same size are made, the cross-sections of which are small in relation to the cross-section of the supply pipe. The bores are expediently directed downwards, especially when using steam, in order to achieve immediate mixing with the circulating medium.

In the case of a roller construction that contains two inner hollow cylinders attached at a distance a, deflection elements are used to reduce the flow resistance,

109828/0918
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KALLE AKTIENGESELLSCHAFT 1775394

r Λ. Our characters day

K 1836 / Gbm 38OI PP-Dr.Kn.-df 16.7.68 -irin particular in the form of inclined, straight or curved surfaces.

example

If the conveying elements of the rolling device are designed in the form of helicals, then corresponds to Circulation device in its mechanism of a screw pump.

The theoretical delivery rate V of a screw pump

V = 7 // 4 (D? - D, 2) s η whereby

D the outside diameter of the helix D. the inside diameter "" s the slope "" η the speed "" mean.

As an exemplary embodiment, a roller was chosen whose outer hollow cylinder has an outer diameter of 450 mm and an inside diameter of 400 mm. The outer diameter of the helix was 398 mm, the inner diameter 280 mm. The slope of the helix was set to 500 mm.

109828/09 18 BATH

KAUE AKTIENGESELLSCHAFT 1775394

<_ Our Zatdian lied jtiit

K 1856 / Gbm 38QI PP-Dr.Kn. -df 7/16/63 -. <& -

The theoretical flow rate for a "roller that is too 453 is filled, is thus

V = Ο.45-IY / 4 (39.8 ² -23 ² ) 50 'η

= 14 200 * η (cm ³ / U) = Ι4.2 · η (dm ³ / U) 3EI a roller speed of η = 20 rpm = 1200 Uph 'beträft the -umgewälzte quantity of liquid V = 14.2 * 1200 = 17,000 diri ³ / h = 17.Ο m ³ / h.

With the arrangement of two circulating devices is thus the flow rate 34 rrr / h.

The actual conveyed amount is slightly less than that theoretical calculated amount. It is lower, the larger, for example, the gap between the end of the rope and the inner diameter of the roller body and the higher the flow resistances are that of the Correspond to the "delivery head" of the pump. In the practical aursfithrurui, the gap is kept as small as possible, He oetr-uc how. from the figures given above can be seen, in this version, example 1 mm.

The resistance to flow is relatively low, in boaondoror performance, however, they are even further by Abüonken dos Umlenkwiderstanaoi; to reduce, üieii happens example-r.veino through the TJmenkorgane in the middle of the · // salts when using two inner ones

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KALLE AKTlEHOESELLSCHAf? 11/5394

JU Our characters day ^ T

K 1836 / Gbm 3801 FP-Dr, Kn, -df 16,7,68 - $ β

Cabbage cylinders or by suitable shaping, with * for example, a certain conicity of the end faces on the inside of the roller.

The power requirement for the pumping work is very low, so that the roller according to the invention is also used as a free-running, ie non-driven, roller, the pumping work being carried out by the web of material pulling the roller. With an average delivery head of 0.1 m corresponding to the flow resistance, the power required for circulation dfr 34 m * / h was only 9 * 3 watts.

By supplying a heating fluid quantity of 1 m ^ / h with two circulating organs was about 30-fold circulation ) of the liquid sump.

With a roller that rotated at 100 rpm = 6000 rpm (such rollers are used, for example, for drying paper or film webs), was fraudulent the circulating rate is about 150 m / h, i.e. the 15Q «conveyor

■ * ■ liquid quantity fed in and out of 1 no / h.

With a supply or discharge of 20,000 W / h , a roller without circulating elements results in the turntable

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BATH

KALLE AKTIENGESELLSCHAFT 1775394 Our Zeldian day

I! 1356 / Gbm 3801 . FP-Dr.Kn.-df 7/15/68

Temperature drop, consumed through the 'salt lenrce', with a liquid throughput of 1 m ^ / h to 2O ⁰ C. With 30-fold circulation, the temperature drops to 0.67 ⁰ O ₃ at 100-fold Circulation to 0.2 ⁰ C.

The part: temperature drop is generally reduced with a η-fold circulation of the supplied amount of heating or coolant compared to a roller without a circulation device to the value l / n, i.e. with a roller with 30-fold circulation to 3% .

In the following figures some V / alzen!: Constructions shown, but not limited to these embodiments.

109828/0918

KALLE AKTIENGESELLSCHAFT 1775394

Jl L · Our characters day BJpK

k 1836 / Übm 38OI FP-Dr.Kn.-df July 16, 68 -16-

Fig. 1 shows a side view of a section through a roller as a circulating device has inner cabbage cylinder 5, which with the outer Hohlzylinaer 1 over the end walls 2 is rigidly connected. At the inner hollow

Wk cylinder, which on the end faces to through

Has outlet openings 7, the conveying elements 6 are arranged. The supply and discharge of the heating or cooling medium is carried out via a hollow roller limb through the Feed pipe l »is guided. When flowing in the medium enters the interior of the roller through the bores 8.

Fig. 2 shows a side view of a section through "a roller, which as a circulation device two

inner hollow cylinder 5a and 5b, which are spaced a are mounted, has. The conveying elements 6a and 6b have opposite slopes. The bores 8a and 8b of the feed pipe 4 are at the same distance from the center of the roller arranged towards.

Fig. 3 shows a side view of a section through a

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KALLE AKTIENGESELLSCHAFT r / 75394

Af Our Zetdven day watt

K 1836 / Gbm 5801 'FP-Dr.Kn.-df I6.7.68 - *?

Roller for reducing the deflection resistance between the two inner hollow cylinders 5a and 5b deflection members are attached. The insides of the two end walls 2 have a conical shape.

Fig. 4 shows a side view of a cross section through an inner body 5, the conveying element 6 of which is designed as a helical screw.

Fig. 5 shows a side view of a cross section through an inner body 5> the conveying organs 6 represent inclined surfaces.

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Claims (11)

KALLE AKT! Et4 47/5394 2e.lrfi.en day ft »K 1836 / Gbm 38OI ^ PP-Dr.Kn.-df 16.7,68 claims 1. Using liquids or condensable vapors heatable or coolable roller in the form of an outer hollow cylinder, which on one or both sides in ^ Hollow shafts are supported by a through the hollow shaft guided tube the heating or coolant enters and / or exits and the inside a Contains circulation device for the heating or cooling medium, characterized in that the circulation ■ device of the roller from one or two in? Distance (a) arranged with the end faces (2) of the outer hollow cylinder (1) firmly connected, coaxially arranged hollow cylinders wAP-kening as guide organs (5, 5a, 5b), the flow ™ Gende Förderargane (6a, 6b) and passage openings (7) for the flowing medium carry the sides facing the face soaps and that the; The tube (4) for the supply of the heating or cooling aid has openings (8), which are preferably arranged at a distance from the center of the roller 2. Roller according to claim 1, characterized in that the conveying elements (6a, 6b) of the BAD ORiMpJAt ''' ^{0 CiAfl} KALLE AKTIENGESELLSCHAFT 1775394 »* ^- Our Ζβΐ4 · η day BJptT K 1635 / abir. 3601 'FP-Dr.Kn.-if Id.7.68 Helical helix and / or Christmas eve shovels are. 3. 'ialze according to claim 1 or 2, characterized in that that the conveyor cr-ranes have inclines in the same direction, whereby between the inner and outer hollow cylinder a unidirectional flow is produced. 4. V / alze according to claim 1 or 2, characterized in that since when two hollow cylinders (5a, 5b) are arranged, their conveying elements have opposite pitches, whereby between .the inner and the outer Hollow cylinder directed towards the center of the roll countercurrent currents are generated. | 5. Roll according to one of claims 1 to ^J l, characterized in that the cross-sectional area of the circulating device is equal to or almost equal to half the cross-sectional area of the roll. 6. Roll according to one of claims 1 to 5, characterized in that the passage openings (7) of the Um- 'rolling device have a cross-sectional sum; the 109828/0918 ^{BAD OR} * Äkf! O Oλ « KALLE AKTIENGESELLSCHAFT 1775394 Q Λ Our characters day BJ ^ lT K 1836 / Gbm 38OI PP-Dr.Kn.-df 7/16/68 is at least equal to the cross section of the circulation device. 7. Roller according to one of claims 1 to 6, characterized in that that in a circulating device consisting of two hollow cylinders (5a, 5b) the distance (a) between the hollow cylinders is at least twice as large as the cross-section of the through-openings (7). 8. Roller according to one of claims.1 to 7 »characterized in that that the supply pipe (4) for the heating or coolant has holes of the same size (8a, 8b) and the holes are directed downwards. 9. Roller according to one of claims 1 to 8, characterized in that that the cross-sections of the bores (8) of the feed pipe (4) are small in proportion to the cross section of the feed pipe. 10. Roller I one of claims i bie 9, characterized in that ate with an UmwftleVutfrichtung, consisting of two hollow cylinders "(5 &» 5b) between the 109828/0918 BAD ORiGiNAt. KALLE AKTIENGESELLSCHAFT "1775394 Our characters day K 1836 / Gbin 38OI PP-Dr.Kn.-df 7/16/68 Hollow cylinders with the tube (4) firmly connected deflection members (9) are arranged. 11. Roller according to one of claims 1 to 10, characterized in that that the deflecting members (9) are inclined, straight or curved surfaces. IA. 109828/0918