DE1964947B1 - Vortex separator for cleaning suspensions - Google Patents

Description

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The invention relates to a vortex separator for keeping as clean as possible. To do this at the same time It is known to purify suspensions, in particular to reduce fiber losses Papermaking certain fiber suspensions, with the dirt outlet of the Wiifbelabscheider the last a vortex tube, which at one end has a step of a cylindrical, coaxial with the vortex tube tangential inlet connection for the 5 to be cleaned and mostly made of transparent material Suspension as well as a backwashing vessel coaxial to the vortex tube, the clear width of which is larger than the outlet nozzle for the cleaned suspension (is greater than the clearance of the dirt outlet and fabric) and tapering conically at its other - which usually tapered at its circumference End of a discharge opening for the disposable inlet connection for rinsing water and for the the dirt (Schmutzauskß), also io continuous removal of the dirt an axial with one outside of the vortex tube in the area of the or tangential outlet nozzle. This construction dirt outlet opening, a smaller light allows a part of the in the back distance as this having feed pipe for rinsing rinsing vessel penetrating fiber material into the we water, belabscheider returned. A complete

The known for cleaning fiber suspension 15 backwashing of the usable fibers is up to nen certain vortex separators all suffer from now unsuccessful; this is especially the case with the deficiency that they either go together with the operation with higher consistencies (in the range over Dirt a relatively large proportion of the approximately 0.8%) rather high fiber losses. Unusable Fibers separate or in the accept it has been observed that the backwash line Leave part of the dirt behind, in any case do not rinse up into the vortex separator Sharp enough the dirt from the accept water flow in the lower area of the vortex cut-off. the already completed separation of the dirt

In a known vortex separator (Voith particles from the accepted material by swirling the formed prospectus No. 319) is at least partially removed from the dirt outlet of the fluidized layers and tube a closed, periodically to be emptied 25 - similar to the vortex separator with Dirt collecting container connected downstream, which has a dirt collecting vessel - foreign bodies with little Has side connection for flushing water. The specific weight when sinking into the return flow Rinsing water rises through the dirt removal rinsing container.

let up into the vortex tube and prevent- The invention is therefore based on the object

A sinking of usable fiber material in 30 still changes the meeting point of the known vortex separators the dirt collector. Thus it is possible to improve further, i. Ji. add a vortex separator To release dirt from the suspension almost fiber-free, which separates an accept with a high degree of purity; however, in terms of the degree of dirt, it is practically fiber-free at the same time outlet-prevailing, upwardly directed flushing dirt supplies.

water flow not only usable fibers, but also 35 This task is described in the introduction also debris back into the vortex tube; NEN vortex separator solved by the fact that the Münes Only such foreign bodies sink predominantly against the feed pipe coaxially to the vortex pipe the rinsing water flow into the dirt is arranged in an orderly manner and directed towards the dirt outlet. down the garbage container, the specific weight of which

is relatively high. As a result, there is still 40 guide tube in the accepted material, which allows the backwash water to be shaped in many cases an unacceptably high proportion of dirt in a sharply delimited and precisely along the longitudinal axis contain. of the vortex tube running through the beam

For these reasons, it is often the case that the dirt outlet flows into the vortex tube ganigen, the cleaning of fiber suspensions in leave, the beam diameter in the range of Multi-stage vortex separator systems are 45 dirt outlet much smaller than the light men. In the case of a vortex separator of the first stage, the size of the dirt outlet is. One way this way Such a system, the dirt flows ikontinu- one reaches that the rinsing jet from the borrowed to the outside, whereby the dirt particles dirt outlet exiting vortex flow, inside with relatively low specific weight half of the various suspension components are largely excreted; d. i.e., the accepts 50 are divided into concentric layers, just the has an extremely high degree of purity. rewinds core containing usable fibers, One accepts here that together with the during those located around the core and Soil is a fairly large proportion of the useful layers of soil containing the dirt particles is eliminated. That is why disturbs can flow out through the dirt outlet, the fibrous dirt for recovery 55 A turbulence of these layers and a sturgeon Fiber material of a second vortex separator in the lower area of the vortex tube Step too, whereby the accepted material obtained there for the separating process that is going on will thereby perish Stage is returned. Avoid discharging.

in the second stage takes place after the desired tests have shown that it is through the

Degree of purity of the accepted material obtained there, as the present invention was first successful in one described above, periodically via a dirt collection container intended for the cleaning of suspensions or, as in the first stage, a continuous separator - even when using a fabric sealer. In the latter case, the dirt can be over 0.8% - losses of usable mat third and possibly even a fourth vortex rial to be avoided completely and at the same time a good separator stage are fed. 65 to obtain the best possible purity. the

It has proven to be advantageous, also in the possibility of using higher consistencies than because the last stage continuously discharges the dirt - so far it has allowed the vortex separator to be discharged smaller, in order to also supply the accepted material obtained here. Since the dirt is practically fibrous

If it is freely available, it can be thickened to higher concentrations than before and therefore with less effort be eliminated.

A vortex separator is known from French patent specification 1057135 in which S a thin coaxial pipe is led into the vortex tube through the dirt outlet is. This pipeline is not used to supply rinsing water, but rather air to help you Operation of the vortex separator to stabilize the air core that forms. Another, 'constructively similar how the subject of the invention designed vortex separator is from the Belgian patent 541784 known. There is a coaxial with the vortex tube, with its mouth 'against the dirt outlet directed and a larger diameter than this having tube for discharging Dirt, so also for a completely different purpose than the feed pipe according to the invention trained vortex separator.

The idea of the invention can be applied to vortex separators without a dirt collecting container or backwash vessel, in which the dirt outlet directly into the open air or into a dirt discharge line opens, but just as well with vortex separators with one of the additional devices mentioned.

Attaching a backwash vessel made of clear material to the dirt outlet has been found to be particularly beneficial. The flushing water supply pipe is guided through the wall of the backwash vessel. This construction allows the emerging from the dirt outlet To better observe and control the flow and the effectiveness of the rinsing water jet. Accordingly can be the distance between the mouth of the flushing water supply pipe and the dirt outlet as well as the clear width of the mouth of the feed pipe can be adjusted to optimal values.

Exemplary embodiments and further advantageous refinements of the invention are given below described in the drawing. In it shows

1 shows a vortex separator with a backwash vessel and rinsing water supply pipe in a longitudinal section,

F i g. 2 the backwash vessel of the vortex separator according to FIG. 1, on an enlarged scale, also in Longitudinal section,

F i g. 3 a backwash vessel according to FIG. 2, but with Collecting nozzle.

The one in Fig. 1 and 2 shown vortex separator consists essentially of one in its upper Area cylindrical vortex tube 10 which is slightly conical in its middle and lower area. This has at the upper end a tangential inlet connection 11 for the suspension to be cleaned as well a coaxial outlet connection 12 for the accepted material, and also a discharge opening 13 at the lower end for the dirt to be removed. This discharge opening is called "dirt outlet" for short. The lower End pieces of the vortex tube 10 located immediately in front of the dirt outlet can also be cylindrical be trained.

At the lower end of the Wirtoel tube 10 is a cylindrical, connected to the vortex tube coaxial backwash vessel 14, with a transparent one Material produced jacket 20, the width of which is about two to three times the light width of the Dirt outlet 13 is, and with a lower part 21, which has a tangential outlet nozzle 22 and a having concentric hub 23. The latter is used to lead through and attach a flushing water supply pipe 24, the mouth 26 of which is inside the backwashing vessel 14 and coaxial with the vortex tube 10 is arranged and directed against the dirt outlet 13. The feed pipe 24 has a nozzle-like one Mouthpiece 25, the width of which in the illustrated embodiment is about 0.15 times the Clearance of the dirt outlet 13 is; it can be exchanged for mouthpieces with a different aperture will. Preference is given to mouthpieces with a light width in the range between 0.1 and 0.3 times the clear width of the dirt outlet 13.

The feed tube 24 is slidably mounted in the longitudinal direction in the hub 23, the distance between the mouth 26 of the feed pipe 24 and the dirt outlet 13 preferably in the area between 0.5 and 4 times the clearance of the dirt outlet is selected.

In Fig. 2 the effect of the spray jet emerging from the feed pipe 24 is shown schematically. The flow lines 30 characterize the movement components in the plane of the drawing of FIG Reality dirt particles flowing down on a vortex. The one that spreads conically The irrigation jet is represented by the flow lines 28, while the flow lines 32 are those in FIG Represent the motion components of the usable fibers lying on the plane of the drawing. As is well known, these migrate initially together with the dirt in the outer vortex downwards, separate here from the dirt and occur partly in the middle, partly in the lower area of the vortex tube in the upwards trending internal eddy over. The exit of usable fibers from the dirt outlet 13 is prevented in the manner described above by the flushing jet 28 coaxial with the vortex tube 10.

Of course, the diameter of the core of the eddy flow, in which useful fibers are included, in the area of the dirt outlet 13 depending on the type of fiber material and depending on the degree different sizes of pollution. The diameter of the irrigation jet is correspondingly too vary, namely, as explained above, by changing the width of the mouthpiece 25 and / or the distance between the mouthpiece and the dirt outlet 13.

If suspensions with a particularly high substance density or with difficult to separate components have to be processed are, so if the layer surrounding the core still contains usable fibers, so it is expediently, between the mouthpiece 25 of the rinsing water supply line 24 and the dirt outlet 13 to incorporate a collecting nozzle 40 (FIG. 3). By such an arrangement acting in the manner of an injector the fiber content of the innermost layer not covered by the flushing jet after entering the backwashing vessel 14 sucked in and fed back into the vortex tube (flow lines 42), while the dirt particles brought into this layer by centrifugal force on the jacket of the backwashing vessel be pushed.

In both exemplary embodiments, the backwashing vessel 14 can replace the cylindrical casing 20 can also be provided with a frustoconical shell, preferably the smaller one Diameter connects to the dirt outlet 13 and is the same as its clear width.

Claims (5)

Patent claims: 1. Vortex separators for cleaning suspensions, especially those used in paper manufacture certain fiber suspensions, with a vortex tube, which at one end has a tangential Inlet nozzle for the suspension to be cleaned and one coaxial to the vortex tube Outlet nozzle for the cleaned suspension and at its other conical tapering End has a discharge opening for the dirt to be separated (dirt outlet), also with a feed pipe for Rinsing water, characterized in that the mouth (26) of the feed pipe (24) is arranged coaxially to the vortex pipe (10) and is directed against the dirt outlet (13). 2. Vortex separator according to claim 1, characterized in that the dirt outlet (13) of the Vortex tube (10) is a known rotationally symmetrical one that is coaxial with the vortex tube and downstream of the backwashing vessel (14) consisting essentially of transparent material is, through the wall of which the feed pipe (24) is passed. 3. vortex separator according to claim 1 or 2, characterized in that the distance between the mouth (26) of the feed pipe (24) and the dirt outlet (13) 0.5 to 4 times the clearance of the dirt outlet is. 4. vortex separator according to one of claims 1 to 3, characterized in that the Clearance of the mouth (26) of the feed tube (24) 0.1 to 0.3 times the clear width of the Dirt outlet (13) is. 5. vortex separator according to one of claims 1 to 4, characterized in that the Mouth (26) of the feed pipe (24) a collecting nozzle (40) designed in the manner of an injector assigned. 1 sheet of drawings