DE1900653A1 - Steam or liquid heated drum - Google Patents

Description

Bag 661

Steam or liquid heated drum

B armag
Banner Maschinenfabrik Aktiengesellschaft

Wuppertal

In numerous branches of technology, for example in the production of threads, tapes, foils, sheets of paper, Cardboard or cellulose, but also in chemical, especially food-chemical process engineering, for example To evaporate liquids such as milk, protein solutions or the like. Rotating rollers are required, their .Use a suitable heating medium to flatten it onto an e. "- * 5th temperature can be heated. In the simplest case han-G .It is a hollow drum with a suitable ? lines for heating steam is equipped. The one in the interior "ä.ura introduced steam transfers part of its heat input

J.tes on the drum wall, where it partially condenses. D \ b Condensate collects at low _{speed of rotation Cj}

; with the drum as a sump inside the drum, at a higher speed - from about 200 m / min. - the condensate is carried along by the rotating drum wall and covers it as a film, If the condensate is a poor conductor of heat, suitable means must be arranged to continuously remove it from the interior of the drum remove. So-called suction shoes, which are arranged a short distance above the inner drum wall, are used for this purpose. and through which the condensate is discharged to the outside under the effect of the increased pressure built up inside the drum.

009833/0890

^ßAD

- 2 - Beg. 661

It is also known that the heating means such as steam or a temperature-controlled To direct liquid through a helical passage along the inner drum wall. This corridor can consist of a suitably shaped tube which passes through Welding, soldering or the like. Attached to the inner drum wall 1st. There are also steam or liquid heated drums known, in the inner wall of which grooves running helically are cut are, and which contain a tubular core, for example, which rests firmly against the groove wall and in this way delimits the helical passage inward.

Rolls of the type described have the disadvantage that the roller body each must absorb the entire pressure of the heating medium, its wall thickness must be correspondingly large, which is too considerable Roll weights leads. High roller weights still require heavily dimensioned frames and bearings, as well as large drive motors and forces.

Basically, there is a certain relief of the roller body from the Heating medium pressure on those known rollers where the Heating means is passed through a helical pipe. However, this relief does not lead to a reduction the wall thickness, since the roller body is considerable due to the welding or soldering of the pipe, which was previously considered necessary Is exposed to thermal stresses, which can only be effectively absorbed with large wall thicknesses. The welding or soldering was done previously considered necessary to have a good and even To achieve heat transfer from the heating medium pipe to the drum wall.

In this prior art, the object to propose a vapor or "lüsslgkeitsbeheizte drum whose drum shell is relieved of the world continuously Heizmitteldruck and may have any consequently, independent of the wall thickness Heizmitteldruck ·

009833/0890

- 3 - bag. 661

According to the invention, this object is achieved in that the inner wall of the drum has a helical guide groove into which a correspondingly helical wound guide tube for the heating medium is positively inserted. The guide groove is advantageously cut or rolled into the inner wall of the drum. Your profile should do the The profile of the guide tube to be inserted must be adapted, so that a wide-area contact between the outer circumference of the guide tube and the groove enters. It has been shown that "as a result, there is practically unhindered heat transfer from the guide tube to the drum wall."

To produce the heating drum according to the invention, it is possible to insert the guide tube outside the drum according to the in the To twist the grooves worked into the drum wall in a helical manner «whereby the resulting helix is a somewhat larger diameter diameter should be issued when it corresponds to the maximum diameter of the grooved helix, by turning the guide tube helix axially it is then possible to temporarily reduce its diameter and to put the helix in this state in the prepared drum or to be placed in the incorporated grooves · After the torsional stress has been removed, the guide tube coil expands slightly again and lays eloh so positively into the grooves.

Deviating from this, however, it is also possible to use the guide tube helix ■ It is exactly the same or with a slightly smaller AuOenduro knife as it corresponds to the naxinal diameter of the grooved helix are screwed in · If a pressurized heating medium flows through the guide tube inserted in this way, so it expands slightly as a result of the heating and the internal pressure, and in doing so it is in a form-fitting manner against the groove walls. on The specified type ensures that practically the entire Heisnltteldruok is caught by the guide tube helix, and that

009833/0890

- 4 - bag. 661

only a small residual pressure, which is necessary for the full concern, has to be absorbed by the actual hot drum.

In a further embodiment of the invention it is proposed that the inner wall of the drum two by half an oanghöhe in axial Direction of offset helically extending guide grooves, in each of which a correspondingly helically wound guide tube for the heating means is inserted in a form-fitting manner, and that the two guide tubes are connected to one another at one end. This embodiment of the subject matter of the invention ensures that the heating medium flows through the drum in two opposite directions of flow, whereby temperature differences along the drum axis which otherwise inevitably result from the cooling are compensated for of the heating medium would arise. The arrangement of two mutually offset screw threads to even out the temperature profile in such heated drums is known to eich.

The invention is explained in more detail below with reference to the accompanying drawings.

Ee put dart Pig. 1 is a schematic longitudinal section through a

Embodiment of the heating "according to the invention" drum;

PlM :. 2 is a schematic longitudinal section through a

other embodiment with two against each other staggered guide grooves.

In Figure 1, the drum body 1 can be seen in a longitudinal section, in the inner wall 2 of which has a helical groove 3 incorporated «for example cut or rolled in. In the groove there is a correspondingly helically wound

009833/0890

- 5 - bag. 661

Guide tube 4 inserted for the heating medium. The drawing shows that the cross-sectional profile of the guide tube 4 corresponds to the cross-sectional profile of the groove 3 cut into the inner wall and that the groove is advantageously so deep that it encompasses at least half of the heating tube. In the example shown, a guide tube with a circular cross section is used. However, it is also possible to use differently profiled tubes, for example square tubes or the like, which has the advantage that in this case the tube can be encompassed even more by the groove, which increases the heat transfer surface.

The one in Pig. 1, the guide tube is monofilar and the heating medium feed end 5 and the heating medium discharge end 6 are led out at the opposite ends of the drum. They end there in heating medium collecting spaces 7 and 8, into which heating medium supply and discharge pipes 11 and 12, which are rotatably mounted in the drum shafts 9 and 10, are inserted through appropriately designed stuffing boxes 13 and 14. In order to facilitate the insertion of the helically wound guide tube, the drum shafts 9 and 10 are fastened, for example screwed, to the front ends of the drum body 1 with the aid of connecting flanges 15 and 16. The heating medium supply end 5 and the heating medium discharge end 6 of the guide tube 4 are also each inserted into correspondingly configured stuffing boxes. The implementation of the ends of the guide tube 4 through the drum shafts 9 and 10 and the arrangement of the stuffing boxes in these shafts is not part of the subject matter of the invention and is limited to the embodiment described here as an example.

In PIg. 2 If an embodiment of the subject matter of the invention is shown, when in the inner wall 2 of the drum body 1 two against each other offset arranged helical guide grooves 3 and 3 * are incorporated, in each of which a corresponding Helical guide tube 4 and 4 * with a positive fit. is inserted. The two guide tubes 4 and 4 * are on one of them

009833/0890 _c

- 6 - bag. 661

Both ends, for example at 17, are connected to one another via a U-shaped pipe or hose section 18. In this way it is achieved that the heating means entering the guide tube 4 according to the arrow 19 and flowing through it is deflected at the opposite end of the roller and there flows through the other guide tube 4 'according to the arrow 20. This arrangement has the effect, in a known manner, that the temperature profile which is formed in the longitudinal axis of the heated drum is made more uniform. The stuffing boxes required for the supply and discharge of the heating medium in this version are also shown in Flg. 2 have been omitted for the sake of simplicity, since they belong to the well-known classes of the Teohnlk.

009833/0890

Claims (1)

- 7 - Bag. Claims 1. Steam or liquid heated drum with inside arranged helical guide tube for the heating means, characterized in that the inner wall (2) of the drum (1) has a helical guide groove (3) into which a Correspondingly helically wound guide tube for the heating medium is inserted in a form-fitting manner. 2 · Device according to claim 1, characterized in that the guide groove (3) is cut or rolled into the inner wall (2) of the drum. 3 · Device according to claim 1, characterized in that the profile of the guide tube (4) corresponds to the profile of the guide groove (3), and that the guide groove (3) so deep into the Body of the drum (1) is incorporated that it has the guide tube (4) at least half of its cross-section includes. 4 · Device according to claim 1, characterized in that the inner wall (2) of the drum (1) has two mutually offset helical lines Has guide grooves (3; 3 *). In each of them a corresponding helical guide tube for the heating oil is inserted positively »and that dl · both guide tube · (4} 4 *) at one end · (17) alternating! «! tend are connected. 009833/0890 Blank page