DK149209B - STATIC MIXING DEVICE - Google Patents

Description

This invention relates to a static mixer of the kind specified in the preamble of claim 1, which may be both circular and prism-shaped, e.g. with a square or rectangular cross section.

In such a mixer as is known from DE publication publication 22 05 371, the number of sections respectively increases. intersection points, which intersect or intersection points are open to each other, for the flow channels in the neighborhoods significantly at 15 relatively large diameters of the casing pipes, e.g. 1 meter and more, if the individual layers exhibit flow channels whose proportions in adapting to the given mixing problems remain unchanged relative to smaller diameter mixers. In addition, for manufacturing and thus economical reasons, it is often desired to use identical shaped layers each time for mixers of different diameters, for example with regard to the shape and size of the flow channels - ie for example 25 in accordance with a publication published in DE publication 22 05 371 proposed preferred embodiment with respect to the rifle height and the rifle width of the sheets with the slats.

30 If the number of open crossing points is greatly increased by large diameter mixers, channels of the mixer may form channels which are strongly depleted on one medium, ie. due to the media flows distributed at the adjacent intersection points of the flow channel, and there is, where appropriate, a significant decrease in concentration of the media to be mixed between the baling apparatus and the center zone, so that in practice the mixing zones of the mixing apparatus 5 only directs some of the components to be mixed and does not take part in the mixing process itself. For example, wastewater for which relatively large diameters are generally required fills, usually the entire empty pipe cross-section before the inflow into the mixer, while e.g.

at a pH value, an acid or a base dosed in the center of the tube is added to the mixer. At many open intersection points in the flow channels, there is a risk that the pH value of a mixer of the kind mentioned above is only affected in the middle zone.

In the field of climate engineering, hot and cold air often has to be mixed in a chamber of relatively large cross-section formed by a casing pipe. Generally, the air streams to be mixed thereby enter the mixer into two compact layers which are enclosed side by side or above one another; Hereby, the problem arises in preventing the layering of extremely unilaterally produced currents arising from the numerous divisions and fluctuations of the essence being substantially preserved.

Static mixers, in which a mixture 30 is effected by means of incorporation elements which cause the transmission of partial flows, is known from DE Publication No. 19 01 281, U.S. Patent 25,46515 or AT Patent 2,60,184; however, with these apparatus, the mixing effect is relatively poor, with only a small number of partial flows, or according to U.S. Pat. No. 25,46515, which discloses within a built-in element of the large 5 and according to U.S. Pat. on the whole, only all of the sub-streams are moved to the side, since the flow channels in two neighborhoods do not cross each other by this device, but are directed parallel to each other. The mixing apparatus according to AT-patent 2 60 184 consists of concentrically arranged annular layers with guide surfaces, which guide surfaces are at least approximately formed in the form of screw surfaces. The mixing effect of this apparatus is also limited, in that a partial flow movement can only take place in the circumferential direction within the individual annular layers, and thus a forced movement in the radial direction is not achieved. In addition, these known mounting elements are in a constructive manner and therefore in a fabrication sense, in no way adapted to the mounting elements described in the preamble, so that special apparatus is needed to manufacture them.

It is an object of the invention to provide a static mixer of the kind specified in the preamble of claim 1 so as to prevent the creation of flow channels in the peripheral region with a highly depleted medium and to ensure a fast and uniform mixing.

This object is solved according to the invention in that the apparatus is designed as specified in the characterizing part of claim 1.

This causes a coarse mixture to a large extent solely by the forced movement of 4 149209 1 sub flows, and a negative drop in concentration in flowing media between the rim zones and the middle zone is also avoided by large sheath diameter, and so that the media leaving Where the apparatus flows into a subsequent mixing apparatus for atomizing with a relatively uniform distribution over the entire casing tube cross section. In particularly favorable cases, a subsequent atomization can also take place in an empty jacket tube after apparatus 10 without additional mixers, solely due to turbulence and diffusion.

In particular, each time a closed plate-like intermediate element is disposed between the two neighborhoods, which element in the peripheral zones facing the casing tube is provided with recesses. The intermediate elements can, for example, exhibit triangular recesses in the peripheral zones - just as is the case with the built-in element layers, such as e.g. can be made of tin 20 or plastic, respectively for the lightening of the casing pipe at the installation site, each time they can center themselves on the overlying sides of the recesses at least two corners inside the casing pipe. However, it is also possible to build intermediate elements of less width than the width of the assigned neighborhoods and, for example, to center in the casing by means of connecting pieces. The intermediate elements may extend over all or, as is the case in the illustrated embodiment, as explained in more detail below, over a portion of the mixer.

The invention is then explained in more detail with reference to the drawing, which shows in perspective an embodiment of the mixer according to the invention.

In a mixing chamber formed by the horizontally extending casing tube 1 in the mixer, there is inserted a 5 integral element consisting of two sections 2 and 3 consisting of a large number of layers 2a, 2b and 3a, 3b formed respectively. of knurled slats.

The layers have rifle mountains denoted by 2 ', 2 ", 3' and 3". Between the rifle mountains 2 ', 2 ", 3', 3", flow channels 5 are formed that are open and intersect due to the inclination of the neighboring areas 2a, 2b, 3a, 3b.

Section 2 serving for coarse mixing 15 is provided with closed plate-shaped intermediate elements 4 disposed between each two neighborhoods 2a, 2b.

The individual intermediate members 4 at their peripheral zones bordering the casing tube 1 have recesses 4a and 4b which in the illustrated embodiment are triangular.

The recesses are designed so that all flow channels 5 ending at the casing tube 1 are open to each other. In this way, the formation of so-called "channels of death" is avoided in relation to the flow.

In section 2, the compact layers of cold air Lr flowing into the mixer from left to right and of the hot air flowing in the same direction Lrø are mixed roughly with each other before flowing 30 into the fine mixing section 3 with a over the entire cross-section already relatively even distribution, in section 3, concentration differences, which may still exist across the cross-section, of cold air and hot air are at least almost completely eliminated, so that the mixing air Lq flowing into a space not shown. which is to be air-conditioned has a uniform temperature.