DE19947745A1 - Throttle valve assembly for the fiber suspension flows at a papermaking or cardboard prodn machine has inlets for two or more incoming flows to prevent fiber clogging and stoppages - Google Patents

Abstract

The throttle valve (1), for the flow of a fiber suspension at a papermaking or cardboard prodn. machine, has a side inlet (3.1) for a fluid flow into the valve zone (2) and at least one further inlet (3.2) for the feed of an additional fluid flow into the valve zone (2). The additional inlet (3.2) is upstream of the narrowed section formed by the valve rod (4). The additional inlet (3.2) is at the side of the valve structure. The inlets (3.1,3.2) give an alignment to the incoming fluid flows, with a direction component which is oriented at a tangent to the center axis (6) of the valve zone (2). On entry into the valve zone (2) from the inlets (3.1,3.2), the fluid flows are at right angles on a plane where a part vol. forms the center axis of the valve zone (2), with an entry angle of 2-25 deg on the plane and pref. 5-15 deg . Two inlets (3.1,3.2) deliver two fluid flows. The valve rod (4) has an expanded section (4.1) at the valve zone side. At least one fluid inlet (3.1,3.2) has a throttle action, pref. as a throttle valve (7.1,7.2), with a variable flow cross section into the valve zone (2). A further cylindrical zone (5) is at the conical section (2.2) of the valve zone (2), pref. as a pipe channel.

Description

The invention relates to a throttle valve for a fluid Flow, in particular a fiber suspension flow in a paper or board machine, with a cylindrical conical cavity (valve chamber) with a first lateral Supply for a fluid in the cylindrical section of the Valve chamber and an outlet opening in the area of conical section of the valve chamber, on the Center axis provided an axially movable valve rod is, with one end of the valve stem in the conical Section of the valve chamber extends and an axial movement the valve stem narrowing the free Flow cross-section in the conical section of the valve chamber can effect.

A similar throttle device is from the German Application DE 44 02 516 A1 of the applicant (PA10049) known. The one described in this published application Throttle valve should be by suitable design fiber wiping or the risk of constipation avoid if possible. Such throttle valves are in newer paper or board machines, especially in the Fibrous suspension feeds to so-called "ModuleJet" - Headboxes of the applicant, often in practice used. Under "ModuleJet" headboxes Head boxes understood that the basis weight cross profile a paper web produced according to the dilution principle regulate by spreading across the machine width Sections more or less intensive dilution water Add the fiber suspension fed in and thus the Amount of solids in the respective section  influence, so that a regulation of the basis weight over the entire machine width becomes possible. This is it necessary to have throttle valves available, one as low a tendency to contamination and tendency to Have fiber wiping. Examples of the execution of such Dilution water-controlled headboxes are not from the applicant's previously published EP patent application (PA10769), application number 99 115 095.5.

In this known headbox concept there is general the problem that a liquid-feeding strand in which there is a throttle device, a fluid flow in initiates a second fluid flow. The introduction must be carried out in such a way that sufficient Mixing between the two fluid streams occurs in order Avoid irregularities in the paper produced. For this purpose, mixing chambers are used, which are the control valves are connected downstream.

Mixing chambers of this type are expensive in their Construction, contain another possibility for education from fiber wiping or to blockages and places hence an additional cost factor in manufacturing and in operation.

It is an object of the invention to provide a throttle valve according to the The preamble of claim 1 to find which it allows additional fluids to be mixed into the throttle valve.

The object of the invention is characterized by the features of Claim 1 solved.

Accordingly, the inventors propose a throttle valve for a fluid flow, especially one Pulp suspension flow in a paper or Cardboard machine, with a cylindrical-conical cavity  (Valve chamber) with a first side feed for a Fluid in the cylindrical portion of the valve space and an outlet opening in the area of the conical section of the valve chamber, on the central axis of which is axial Movable valve rod is provided, one end of the Valve rod in the conical section of the valve chamber is sufficient and an axial movement of the valve rod Narrowing of the free flow cross section in the conical Section of the valve chamber can cause further develop that at least one additional feed for another fluid is provided in the valve space, wherein this at least one further feed upstream of the is arranged constriction which can be brought about by the valve rod.

Through this inventive design of the throttle valve it is achieved that one or more additional fluids in the Main flow that is passed through the throttle valve can / can be injected, with the arrangement of the Feed upstream of the restriction of the throttle valve optimal mixing of the introduced liquids with the main flow - usually a fiber suspension flow - arises.

It can be advantageous for optimal mixing, if the further supply of fluid to the side of the supply - for example radial or tangential to the valve space - is arranged.

If at least one of the feeders, preferably each of the Feeders, designed such that this one Has flow alignment with a directional component, oriented tangentially to the central axis of the valve space is, a desired rotation of the Flow in the valve chamber is reached, causing a Self-cleaning effect in the valve compartment.  

It is also advantageously possible to use one of the Feeders, preferably each of the feeders, with one To provide flow orientation when entering the Valve space is perpendicular to one level, the subset forms the center axis of the valve chamber. This matches with one perpendicular to the center axis Flow orientation of the feed, but this is laterally offset to the center axis.

Another alternative embodiment provides that at least one of the feeders, preferably each of the Feeders, a flow orientation when entering the Has valve space which is at an angle of 2 ° to 25 °, preferably 5 ° to 15 °, on a level whose Subset forms the center axis of the valve space. Hereby the inflowing fluid becomes a velocity component given towards the outlet of the throttle valve and one favorable flow arrangement achieved.

According to the idea of the invention, a special Execution of the throttle valve is that this has exactly two feeds for two fluids, the should be mixed together. It is possible that the Feeders are arranged in one plane. However, it does exist also the possibility that the feeds can be divided into several levels below each other. That is, the Feeds follow in the main flow direction of the Throttle valve one after the other.

The valve rod of the throttle valve can, for example be simply cylindrical. However, there is also the possibility of this at their valve chamber end to be equipped with an extension. Regarding others special designs of the valve rod is also on the applicant's patent application DE 197 10 295 A1 (PA10502DE). The revelation content of this  Registration is hereby full, especially regarding the possible design of the valve rod in the present patent application added.

Another special embodiment of the invention Throttle valve provides that at least one of the feeds has an additional throttle option. This can consist, for example, that these are throttled Feeding a changeable entrance cross section into the Has valve space. It is also possible in one or several feeds throttle valves, e.g. B. ball valves, to be installed, which are also operated by servomotors can. This type of execution can easily Way, the proportions of the supplied Fibrous suspension flows can be designed variably and thereby, for example, the solids content of a Total fiber suspension flow through different Addition of dilution water can be influenced.

If further feeds into the valve space are realized, see above there is also the possibility of for example with regard to the fine substance content, the average Grind or with respect to added binder in in the desired manner, if necessary independently of one another vary and thus the quality and characteristics of a manufactured paper or cardboard web, if necessary also the cross-property profile of a manufactured paper or Cardboard web, to influence or regulate accordingly.

Another advantageous embodiment of the throttle valve provides that the conical section of the Valve space another cylindrical space, if necessary a pipe, through which the Fibrous suspension, for example, the headbox can be supplied.  

It is understood that the above and Features of the invention not yet to be explained below only in the specified combination, but also in other combinations or used alone, without leaving the scope of the invention.

Additional features and advantages of the invention result more preferred from the following description Embodiments with reference to the drawings.

The invention will now be described with reference to the drawings are explained. It represent

Fig. 1 side view of a throttle valve according to the invention with two tangential feeds;

Fig. 2 is plan view of a throttle valve of the invention with two tangential inlets;

Fig. 3 is side view of a throttle valve of the invention with four tangential inlets into the valve chamber in four levels;

Fig. 4 is plan view of a throttle valve of the invention with four tangential inlets into the valve chamber in four levels;

FIG. 5 is side view of a throttle valve of the invention with a tangential and an eccentric fluid supply;

Fig. 6 top view of the throttle valve according to the invention with a tangential and an eccentric fluid supply.

Fig. 1 shows a side view of a throttle valve 1 according to the invention with a cylindrical-conical valve chamber 2, which has α upstream over a cylindrical portion 2.1 and a thereafter following conical portion 2.2 having an opening angle. Following the conical section 2.2 of the valve chamber 2, there follows a cylindrical chamber 5 , which is designed here as a pipe.

In the cylindrical part there are - arranged on one level - two feeds 3.1 and 3.2 which, for example, introduce fiber suspension and dilution water into the valve chamber. Because of the tangential arrangement of the two feeds, this flow receives a rotational component which is guided downward in a helical manner around the valve rod 4 arranged in the concentric, cylindrical-conical space. The valve rod 4 has an extension 4.1 at its lower end, which leads to a narrowing of the cross section in this area. If the valve rod 4 is moved axially downward, a further, variably adjustable constriction and thus throttling of the flow occurs, which results in an optimal mixing after the constriction.

FIG. 2 shows the throttle device 1 of FIG. 1 from above. The tangential arrangement of the feeds 3.1 and 3.2 to the valve chamber 2 can be seen particularly well. The valve rod 4 with its extension 4.1 can be seen in dashed lines. The valve rod 4 can be actuated manually, for example, or can also be adjusted in height and thus in its throttling effect via servomotors.

In both FIGS. 1 and 2, in the area of the feeds 3.1 and 3.2, dashed valves 7.1 and 7.2 , which can be used optionally, are shown schematically, with the aid of which the volume flows in the feeds 3.1 and 3.2 to the throttle device 1 can be regulated.

FIG. 3 shows a further possible embodiment of the throttle valve 1 according to the invention with four feed lines 3.1 to 3.4 which, as can be seen from FIG. 4, are arranged symmetrically tangentially from above. The feeds lie in four levels arranged one below the other, so that the feeds 3.1 to 3.4 feed fluid into the valve chamber 2 one after the other in accordance with the numerical order. Similar to the throttle valve of FIG. 1, a centrally arranged valve rod 4 is also provided which can variably influence the throttle effect of the throttle valve by means of an axial movement and at the same time also ensures optimal mixing, which ensures that the fluids supplied via the feeds 3.1 to 3.4 .

Another possibility - not shown here - of supplying secondary flows into a main flow may consist, for example, in that the supply line 3.1 , which may be larger than the other supply lines, is arranged in an upper level and one or below it in a single level several, for example three, symmetrically arranged, tangential feeds 3.2 to 3.4 inject the corresponding fluids to be metered into the valve chamber. The advantage of such an arrangement lies in the fact that all side streams which are introduced through the feed lines 3.2 to 3.4 are treated absolutely identically, with regard to their flow guidance.

Another possible embodiment of the throttle valve according to the invention is shown in FIG. 5. The Fig. 5 corresponds to a throttle valve as it is known for example from the above-cited patent application DE 44 02 516 A1, however, the throttle device on an eccentrically arranged to the center axis of the valve chamber supply 3.2, which the metered fluid coaxially into the rotating main current is injected through the tangential line 3.1 , initiates. An advantage of such an embodiment is that the introduction of the additional fluid, which is almost perpendicular to the rotational flow, results in optimal mixing even before the expansion 4.1 of the valve rod 4 .

FIG. 6 shows a top view of the throttle valve shown in FIG. 5 with the tangential feed 3.1 in the valve chamber 2 and the second fluid feed 3.2 arranged coaxially to the center line of the cylindrical-conical valve chamber, the cross section of which corresponds to a circular sector.

Overall, the throttle valve according to the invention achieved that a very compact design Throttle device with integrated mixing space is possible and a high integration density can be achieved in this way can. This is particularly advantageous for headboxes that work according to the dilution water principle, as with these Headboxes a large number of throttle valves and Mixing devices are used, which makes a very compact design of this type of headbox results.  

Reference list

1

Throttle valve

2nd

Valve space

2.1

cylindrical section of the valve chamber

2.2

conical section of the valve chamber

3.1

first feed

3.2

second feed

3.3

to

3.4

further additions

4th

Valve stem

4.1

Extension of the valve rod

5

Pipeline

6

Center axis

7.1

,

7.2

Throttle valves
α opening angle

Claims (10)

1. Throttle valve ( 1 ) for a fluid flow, in particular a fiber suspension flow in a paper or board machine, with a cylindrical-conical cavity (valve space) ( 2 ), with a first lateral feed ( 3.1 ) for a fluid in the cylindrical section of the Valve chamber ( 2.1 ) and an outlet opening in the area of the conical section of the valve chamber ( 2.2 ), on the central axis ( 6 ) of which an axially movable valve rod ( 4 ) is provided, one end of the valve rod ( 4 ) being in the conical section of the valve chamber ( 2.2 ) is sufficient and an axial movement of the valve rod ( 4 ) can narrow the free flow cross section in the conical section of the valve chamber ( 2.2 ), characterized in that at least one further feed ( 3.2-3.4 ) for another fluid into the valve chamber ( 2 ) is provided, said at least one further feed ( 3.2-3.4 ) upstream of that through the valve rod ( 4 ) b effective constriction is arranged. 2. Throttle valve ( 1 ) according to the preceding claim 1, characterized in that the at least one further feed ( 3.2-3.4 ) is arranged laterally. 3. Throttle valve ( 1 ) according to the preceding claims 1 to 2, characterized in that at least one of the feeds ( 3.1-3.4 ), preferably each of the feeds, has a flow orientation with a directional component which is oriented tangentially to the central axis of the valve chamber ( 2 ) is. 4. Throttle valve ( 1 ) according to one of the preceding claims 1 to 3, characterized in that at least one of the feeds ( 3.1-3.4 ), preferably each of the feeds, has a flow orientation when entering the valve chamber ( 2 ), which is perpendicular to one Level stands, the subset of which forms the central axis of the valve chamber ( 2 ). 5. Throttle valve ( 1 ) according to any one of the preceding claims 1 to 3, characterized in that at least one of the feeds ( 3.1-3.4 ), preferably each of the feeds, has a flow orientation when entering the valve chamber ( 2 ), which is at an angle from 2 ° to 25 °, preferably 5 ° to 15 °, on one level, the subset of which forms the central axis of the valve chamber ( 2 ). 6. Throttle valve ( 1 ) according to one of the preceding claims 1 to 5, characterized in that two feeds ( 3.1 , 3.2 ) are provided for two fluids. 7. throttle valve ( 1 ) according to any one of the preceding claims 1 to 5, characterized in that the valve rod ( 4 ) has an extension ( 4.1 ) at its valve chamber end. 8. throttle valve ( 1 ) according to any one of the preceding claims 1 to 6, characterized in that at least one of the feeds ( 3.1-3.4 ) has a throttle option , preferably a throttle valve. 9. throttle valve ( 1 ) according to the preceding claim 8, characterized in that the at least one throttle feed has a variable inlet cross-section in the valve chamber ( 2 ). 10. Throttle valve ( 1 ) according to any one of the preceding claims 1 to 9, characterized in that at the conical section ( 2.2 ) of the valve chamber ( 2 ), another cylindrical space ( 5 ), optionally a pipe, connects.