DE2338922A1 - DRYING CYLINDER FOR STEAM HEATING - Google Patents

Description

ap / A 5267 ■ J. M. Voith GmbH

Password: "Groove insert ¹¹ Heidenheim / Brenz

Drying cylinder for steam heating

The invention relates to a drying cylinder for steam heating, with a cylinder jacket which is provided with circumferential grooves the pipes for sucking off the condensate protrude.

Such drying cylinders are known from DT-PS 4970 ^ 4 mainly used as a crepe cylinder in cotton wool machines. It is particularly important that the heat transfer over the entire surface of the cylinder is uniform. The circumferential grooves known from the aforementioned patent have although already brought a major improvement in terms of heat transfer. Is near the condensate suction pipes However, as a result of their suction effect, the condensate film is thinner, which means that the heat transfer is significantly higher at these points.

The invention is based on the object of designing drying cylinders of the type mentioned in such a way that one largely uniform heating of the outer surface of the jacket is achieved over the circumference.

According to the invention, this object is achieved in that inserts which touch the bottom of the groove are arranged within the grooves, which are held on the boundary walls of the grooves by clamping action are. As a result, the condensate film is subjected to an intensive turbulence over the entire circumference, which in turn enables even heat transfer to the cylinder jacket. Clamping the inserts makes them easier to use.

509808/0939

This is only possible because there is a different type of fastening for several A thousand uses per drying cylinder would be extremely uneconomical.

According to an advantageous embodiment of the invention, the inserts have a radial height of 2 to 15 mm. So they are about in the area of the film thickness, whereby an optimal turbulence is achieved.

It is also very advantageous if the inserts according to the invention in the circumferential direction at a distance of 0.1 to 0.5 m are arranged. This distance has also proven to be very favorable for the turbulence.

Several exemplary embodiments of the subject matter of the invention are shown in the drawing shown. Show:

1 shows a cross section through a drying cylinder

with circumferential grooves in which a condensate ring has formed and in which inserts are arranged are,

2 shows a longitudinal section through the drying cylinder with various inserts in the circumferential grooves and

FIG. 3 shows a plan view of the inserts according to FIG. 2.

1 with a drying cylinder is designated, which has a cylinder jacket 2 has, on the inside of which circumferential grooves 3 are provided. The circumferential grooves 3 are separated from one another by ribs 4. In the grooves 5 are provided inserts 5 which sit on the groove base and are supported on the grooves 4 and are resilient there clamp. Various exemplary embodiments are shown in FIGS. 2 and J5 of the stakes shown. In the first embodiment

509808/0939

two inserts 51 are formed on a U-shaped bracket 52, which is placed over a rib and is there due to the clamping effect of the bracket. The two inserts 51 protrude in adjacent grooves into it. A U-shaped insert is denoted by 53, whose longitudinal axis runs radially. Another insert 54 has two U-shaped parts which are connected to one another at their webs are welded. When insert 55 is in a U-shaped resilient Part of a clamping piece welded in. It is also possible to use a pipe section as a. Use 56, its The longitudinal axis then also runs radially. The insert 57 is essentially the same as the insert 55 * it exists in contrast to this from a single piece.

Heidenheim / Brenz

July 31, 1973
Huz / HKn

509808/0939

Claims (4)

ap / A 3267 -If. J.M. Voith GmbH Password: "Groove insert" Heidenheim / Brenz Claims !. ^ Drying cylinders for steam heating, especially for paper machines with a cylinder jacket which is provided with circumferential grooves, characterized in that shut-off elements in the grooves are used, which shut off at least the part of the groove cross-section located in the area of the groove base, and that the shut-off elements are held by clamping action. 2. drying cylinder according to claim 1, characterized in that the inserts have a radial height of 2 to I5 mm. 3. drying cylinder according to claim 1 or 2, characterized in that that the inserts are arranged in the circumferential direction at a distance of 0.1 to 0.5 m. 4. drying cylinder according to one of claims 1 to 3, characterized in that that the shut-off elements are designed as sleeves which are essentially perpendicular to the bottom of the groove. 50980870939 5. Drying cylinder according to one of Claims 1 to 3, characterized in that that the shut-off elements of two adjacent grooves are connected to one another in pairs by a bracket the lip between the two grooves overlaps and this wedges between them. Heidenheim / Brenz ^ _{A m A} _ _A _ July 31, 1973 509808/0939 Huz / HKn Blank