DE1901281C3 - Device for mixing flowing media - Google Patents

Description

2. Device according to claim 1, characterized in that axially protruding, flow-directing prongs (* { are arranged between the bores in the outer regions of the end faces of the insert (1)

⁽ 3 Volhiing according to claim 1 or 2, characterized in that the entry and

Exit end face of the insert (1) completely the same. ...

other circuit by a whole number (eg., 10) elements is necessary, which leads to considerable flow ^ stalls and pressure losses, or to _m "o c5rh on turbulence or Diffusionserscheinunmuß sicü aur r" ¹ ^ "* Stö but it ib

arranged in pairs ςΗ ^ with

from

evenly
according to
intended
Axes are

one of the stalls

smd
dykes η

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full as out

sharp transition P ^^

Cut into two small square transverse niches are unavoidable microphone dead spaces If there are several or even many horizontal ^ e ^ n, there are numerous corners ^ * J ^ Ä and there are very high * ^{™ * η} & ™ * ™ £? Be J "™" ^hr large pressure losses. In particular, tougher FIusfigkeiten is a g.eichmäßi _g he throughput and a good Durchm.schung with e.ner such Vornchtung unreachable.

of gases with air for the purpose of

according to one of claims 1 to 3, characterized in that three pairs of parallel bores (2, 3) with circumferential angular distances of 120 "are arranged (Fig. 1

35

The invention relates to a device 4 » For mixing media flowing in a laminar flow in a pipeline with a stationary, free one Cross-section of the pipeline filling the cylindrical insert from its inlet to the The exit end face has openings which extend the entire media flow into partial flows divide different flow directions.

The invention is based on the principle of mixing devices for media flowing in lines, which are split into partial flows, interwoven and recombined by one and the same device inserted in the relevant line. For this purpose, devices of the type mentioned are already known, for example from German Auslegeschrift 1138 023, where annular guide elements with adjacent channels have been proposed, the preferably approximately rectangular cross-sections of which change in the longitudinal direction. Such devices are not easy to manufacture, which is only possible with a sheet metal welded construction. Therefore, acquisition and installation are expensive. Compared to the blank pipe, the known Guided members have as is required for mixing 6 _S of gaseous or granular materials in order to achieve a large proportion of additional surfaces, so in principle suitable only for cables with larger diameter, a sufficient Vergleichmaßigung the flowing mixture is a back entry

publication 509 02 learn qg Order with channels in front of each one Edge to an opposite edge or to the center are led crosswise. Such a one The device is not suitable for mixing and homogenizing liquids. A mixture namely, it does not come about solely through the subdivision of the flow by means of the internals, but In the gaps between these internals, turbulence in the gas flow is necessary in order to to achieve an intimate mixing of several components. Liquids in particular oteierVe. The viscosity was only weakly mixed the residence time spectrum would be worsened because the Streams remain largely on the sidelines. The internals known from this publication are in the Production and assembly are expensive and because of their Complicated structure cannot be used for narrow lines.

It has also m pipes Mixers arranged to mix ura pimply or fluid substances during transport. These agitators take up a considerable amount of their own space and also have to be driven externally. Only a partial homogenization of the Mromung is achieved. In the case of smaller pipeline cross-sections, agitators cannot be used because of the volume they take up and the pressure losses that occur.

The object of the invention is to overcome the disadvantages of the prior art with simple, economic means a device for marrying of media flowing in a pipeline, by means of which media flowing in laminar flow Liquids with high viscosity as well as possible low flow resistance already in reasonable terms short pipe sections a good leveling the flow is achievable.

This task is carried out when the one

initially mentioned type according to the invention thereby running at both ends three bore holes, that the breakthroughs are centered together by several Boh- fertilize so that the radial position rang are formed, which corresponds in part to that of a prong from the middle of each hole, so Area of the entry face to the outer area that the assigned, opening at the periphery Bohder The exit end face and in part from the outer rungs sit, so to speak, radially on a gap. Infollowing the entry end face to the central area of which are all six BohniEgen in a transverse center exit end face of the insert, the level of the flow mixer is arranged in a hexagonal

E ^: n such a mixer is extremely simple because a hexagonal packing is known to be the

built up. It can have the highest possible density drilled from a workpiece, this means a

and milled or cast in one piece or combined optimal use of the cross-section with the smallest

be tert. There is only a minimum additional, volume fraction of the feedstock. Achieved thereby

flow-inhibiting surface available. The minimum flow resistances and corresponding

Subdivision into an inner and an outer region with low pressure losses. That the holes

richly causes the edge flow to run parallel to each other in pairs, simplified further

Core flow on a short way and extraordinary 15 ner the production extraordinary,

mixed quickly. This is particularly important in the case of la- An embodiment of the invention

Mineral flows of liquids of high and mixer is shown below with reference to the drawing

highest viscosity, which is explained in pipelines. In it shows

Reynolds numbers below 3000 a laminar flow F i g. 1 is an end view and

with a parabolic velocity profile. »° F i g. 2 shows an axial section through the insert eni-At the outer edge, the particles flow slowly along the line of intersection in FIG. 1.
and have a longer dwell time there than the one-particle that is fixedly installed in a pipeline inside the core of the flow. Due to offset 1, it is formed in one piece and, between the swap of the core and edge flow, the earth orifices, n bores 2 and 3 at the end of the mixer according to the invention, each have the parabolic flow teeth 4. The preferred paired paralmungsprofil systematically and so improves the lelen bores 2 and 3 (Fig. 2) are in the circumferential dwell time spectrum, which is advantageous if the direction is shifted, z. B. at angular intervals of 120 z. B. in the flow a physical or chemical (Fi g. 1). They form a reaction taking place on one end face, the transported batch 1 decomposes an outer or an inner partial flow zone or undesired secondary reactions, and on the other end the inner or outer ones lead to harmful byproducts. With her- partial flow zone. Inflowing liquid is so in conventional devices this phenomenon can be divided into a core and an edge flow. After exiting the insert at high transport speeds, the core and edge flow sections of the pipeline sections have slightly reversed their positions in the pipeline. Reduce the dimensions without, however, being able to change the dwell time spectrum appreciably. at the inlet and outlet of the insert.

One embodiment of the invention consists in In an installation example of the invention that between the bores of the outer areas this was used in a pipeline of 1.5 m the end faces of the insert axially protruding, strö- length and 20 mm diameter inserted through the directional prongs are arranged. By the 4o melted polyethylene terephthalate from one in the circumferential direction alternating arrangement of the melter to a further processing Ma-projections and indentations are dead space machine flows. With this arrangement the Visin takes the flow avoided. This further contributes to the melt viscosity by 100 P from 3000 to 2900 P rapid and complete homogenization of the ab. Without installing the mixer, the viscosity of the flow medium was even in narrow lines at, * S ity reduction 300 P.

whose diameter is less than 25 mm, for example. In another installation example, an inven-

can be. proper use in a transparent pipeline

In preferred developments of the invention device of 1 m length and 25 mm diameter used

it is provided that the entry and exit end face builds. A mixture of water was added to the pipeline

of the insert completely identically designed and three 5 <> water and 2% sodium methacrylate supplied. Before the

Pairs of parallel bores with circumferential angle mixer was the flow medium at Rey-

Stands of 120 ° are arranged. Thanks to these Genolds numbers from 3 to 3000 in the aspect ratio

It does not matter in which of the two nis of 1: 1 into a peripheral and a core flow

Axial directions the mixing device is divided into the respective, which have been colored differently,

fende pipeline is used, which is due to the 55 After flowing through the insert according to the invention

With the compact design, there could be no visual color differences between

is borrowed. In any case, the inner flow will be more determined after the edge and core flow;

outside and at the same time the outside flow into the residence time spectrum was therefore strongly narrowed,

nen directed, and both the flow direction Without insert showed the medium before emerging from the

As well as the between them at the mouth ^6o pipeline the separation between edge and core

of the bores existing indentations flow still clearly.

have the same course, i.e. also the same we- In both installation examples, inserts could

kungen. Conventional flow mixers do not have conventional mixing devices in the narrow

on the other hand, in the axial direction, in principle, un-pipelines are installed, whereas the

symmetrical structure, so that the installation direction ⁶ 5 use according to the invention and especially for

is invariably given. With the preferred pipelines with diameters of the smallest

Embodiment of the mixer according to the invention with nominal widths of up to about 50 mm is suitable.

Hicizu 1 sheet of drawings

Claims (1)

Patent claims: 1. Device for mixing laminar flow in a pipeline with a stationary, cylindrical insert filling the free cross-section of the pipeline and having openings extending from its inlet to the end face which SLETSÄÄ; StET d ^Ve a ^r : characterized in that the opening * «are formed by several bores (2, 3), which are partly from the central area of the entry face to the outer area of the outlet face and partly from the outer area of the entry face to the central area of the The outlet face of the insert (1)