DE102010028408A1 - Valve for regulating a fluid flow - Google Patents

Abstract

The invention relates to a valve (1) for regulating a fluid flow (2), in particular a fiber suspension flow (2.1) which is preferably guided in a machine (200) for producing a fibrous web, in particular a paper, cardboard or packaging paper web, comprising a hollow body ( 3) with a substantially at least partially rotationally symmetrical cavity (4) having a longitudinal axis (4.L), the at least one inlet opening (5) having a longitudinal axis (5.L) with an inlet channel (5.1), a variable and in Has a substantially rotationally symmetrical passage surface (6) and an outlet opening (7) with an outlet channel (7.1), and a passage surface (6) which can be moved coaxially in the cavity (4) of the hollow body (3) preferably by means of at least one actuating means (10; 11) ) due to a displacement (V) variable, in particular a valve plate (9) having and preferably rotationally symmetrical valve rod (8). The valve (1) according to the invention is characterized in that it has at least two functional areas (I, II), the first functional area (I) having an operating mode (MI) with a linear or approximately linear valve characteristic (K) and the second functional area ( II) represents a flushing mode (M.II) with a non-linear, preferably abruptly rising valve characteristic (K).

Description

The invention relates to a valve for regulating a fluid flow, in particular a preferably in a machine for producing a fibrous web, in particular a paper, cardboard or packaging paper web, guided pulp suspension flow, comprising a hollow body having a substantially at least partially rotationally symmetrical and a longitudinal axis having cavity, the at least one, having a longitudinal axis inlet opening having an inlet channel, a variable and substantially rotationally symmetrical passage surface and an outlet opening with an outlet channel, and a preferably by means of at least one actuating means coaxially displaceable in the cavity of the hollow body, the passage area as a result of a shift variable, in particular a valve disk having and preferably rotationally symmetrical valve rod.

Such a valve for a liquid is for example from the document EP 0 633 416 A1 known. The liquid is a stock suspension which can be fed to a headbox of a paper machine.

The valves commonly used today in a machine for producing a fibrous web, in particular a paper, board or packaging paper web, in particular dilution water valves, are important functional elements of the headbox and, together with other components, largely responsible for the quality of the fibrous web to be produced. Reliable, trouble-free and long-lasting valve characteristics are an important prerequisite for achieving the best possible quality. The fulfillment of these properties is particularly important under the conditions prevailing in the fiber web manufacturing conditions in which at least one fiber suspension must be controlled with some very high content of fine and filler continuously and at a high temperature of up to about 70 ° C, very important.

The valves used by the various manufacturers of machines for producing a fibrous web, in particular dilution water valves are sometimes completely different. Thus, in addition to linear valves and rotary valves are successfully in use.

Both a rotary valve, as for example from the document EP 0 633 352 B1 is known, as well as a linear valve, as for example from the cited document EP 0 633 416 A1 or the pamphlets DE 199 49 067 C1 or EP 1 591 585 B1 is known, requires at certain intervals and not least due to the properties of the fluid flow used a cleaning or flushing. This effort is usually provided at standstill of the valve or the headbox for the machine for producing a fibrous web either manually or by using a fluid flow with other, preferably cleaning properties. These known approaches are on the one hand very time-consuming, on the other hand also associated with high costs.

The 1 shows a valve characteristic K of the printed publication EP 0 633 416 A1 disclosed valve for a liquid.

On the abscissa, the valve opening Ö of the known valve is plotted in percent, on the ordinate, however, the open cross-section Q of the known valve is plotted in percent.

It can be clearly seen that the known valve has a curved valve characteristic K and only from a valve opening Ö of at least 95% (dashed line) has the necessary conditions for an effective cleaning or rinsing process. And until reaching this valve opening Ö of at least 95% from an exemplary operating position (dotted line) out a relatively large displacement of the valve rod of the known valve is necessary.

Furthermore, to regulate a fluid flow, in particular a preferably in a machine for producing a fibrous web, in particular a paper, cardboard or packaging paper web, guided pulp suspension flow also known from the prior art ball valves, valves, control valves, diaphragm valves, pinch valves, needle valves or the like can be used. However, they all have disadvantages known to those skilled in the art.

It is therefore an object of the invention to improve a valve of the type mentioned in such a way that the mentioned disadvantages of the prior art are largely reduced, preferably even completely avoided. In particular, the possibility of a flushing function in one and the same valve should be created. The rinsing function should be able to be optimized, in particular in the short-term circulation operation of the machine for producing a fibrous web and / or before a cleaning stop.

This object is achieved in a valve of the type mentioned in the present invention in that it has at least two functional areas, wherein the first functional area an operating mode with a linear or approximately linear valve characteristic and wherein the second functional area a rinsing mode with a non-linear, preferably represents abruptly rising valve characteristic.

The object of the invention is completely solved in this way.

This embodiment of the valve according to the invention is characterized by at least two functional areas in one and the same unit, a first functional area for the operating mode and a second functional area for the flushing mode. Due to the constructive unit, the novel flushing function can also be realized optimized in the short-term circulation operation of the machine for producing a fibrous web and / or before a cleaning standstill.

The purge mode with its non-linear, preferably abruptly rising valve characteristic has a maximum flow, ie throughput, which is to be achieved with a small adjustment. The corresponding valve characteristic thus runs steeper than the regular valve characteristic for the operating mode. The background for this is that it should give a very high throughput for rinsing purposes. To achieve a completely open cross-section of the adjustment is shortened or movement in the two areas only a small linear displacement is required.

The hollow space of the hollow body is preferably at least partially designed such that in the operating mode a valve opening in the range of 0 to about 75% and an open cross-section (Q) of 5 to about 75%, preferably from 10 to about 75%, in particular of 15 up to about 75% of the maximum open cross-section can be achieved. In addition, it is preferably at least partially designed such that in the rinsing mode, a valve opening of at least 75% and an open cross-section of at least 75% of the maximum open cross-section can be achieved. This overall characteristic of the valve according to the invention is achieved by a significant jump in the cross section takes place in the course of the open cross-section of the valve according to the invention over the valve opening of the valve according to the invention. In the rinsing mode or cross-section, the open cross-section of the valve according to the invention widens on a short adjustment path to the maximum open cross-section of the valve according to the invention. The valve properties described are particularly advantageous when using the valve according to the invention in a headbox for a machine for producing a fibrous web.

• – die eine Längsachse aufweisende Einlassöffnung weist einen Durchmesser im Bereich von 10 bis 60 mm, vorzugsweise von 15 bis 50 mm, auf;
• – ein Übergangsbereich weist einen Übergangswinkel im Bereich von 60 bis 120°, vorzugsweise von 80 bis 100°, insbesondere von 85 bis 95° auf;
• – ein zylindrischer oder annähernd zylindrischer Bereich weist einen Durchmesser im Bereich von 10 bis 60 mm, vorzugsweise von 15 bis 50 mm, und eine Länge im Bereich von 0,1 bis 50 mm, vorzugsweise von 0,1 bis 20 mm, auf;
• – der erste, den Spülmodus darstellende Funktionsbereich ist ein erster Konfusor, dessen Durchmesserverhältnis Eintritt-Austritt im Bereich von 1 bis 2, vorzugsweise von 1,1 bis 1,5, liegen;
• – der zweite, sowohl den Betriebsmodus als die veränderbare und im Wesentlichen rotationssymmetrische Durchtrittsfläche darstellende Funktionsbereich ist ein zweiter Konfusor, dessen Durchmesserverhältnis Eintritt-Austritt im Bereich von 1,2 bis 4, vorzugsweise von 1,5 bis 2,5, liegen; und/oder
• – der Endbereich des zweiten Konfusors und ein zylindrischer oder annähernd zylindrischer Bereich weisen einen Durchmesser im Bereich von 5 bis 30 mm, vorzugsweise von 10 bis 25 mm, insbesondere von 10 bis 20 mm, auf, wobei der zylindrische oder annähernd zylindrische Bereich zudem eine Länge von 0,1 bis 50 mm, vorzugsweise von 2 bis 20 mm, aufweist.

Furthermore, the regions of the hollow space of the hollow body which are arranged in the flow direction of the fluid flow, in particular the pulp suspension flow, preferably have at least one of the following properties:

• - The inlet opening having a longitudinal axis has a diameter in the range of 10 to 60 mm, preferably 15 to 50 mm;
• - A transition region has a transition angle in the range of 60 to 120 °, preferably from 80 to 100 °, in particular from 85 to 95 °;
• A cylindrical or approximately cylindrical region has a diameter in the range from 10 to 60 mm, preferably from 15 to 50 mm, and a length in the range from 0.1 to 50 mm, preferably from 0.1 to 20 mm;
• The first functional region representing the purge mode is a first confuser whose diameter-to-exit diameter ratio is in the range of 1 to 2, preferably 1.1 to 1.5;
• The second functional region, which represents both the operating mode and the changeable and substantially rotationally symmetrical passage surface, is a second confuser whose diameter ratio inlet-outlet lies in the range from 1.2 to 4, preferably from 1.5 to 2.5; and or
• - The end portion of the second confuser and a cylindrical or approximately cylindrical portion have a diameter in the range of 5 to 30 mm, preferably from 10 to 25 mm, in particular from 10 to 20 mm, wherein the cylindrical or approximately cylindrical portion also has a length from 0.1 to 50 mm, preferably from 2 to 20 mm.

Also, the valve disk of the preferably rotationally symmetrical valve rod preferably has a smaller diameter than the end region of the confuser and of the cylindrical or approximately cylindrical region, so that a variable throttle is formed, which constantly has a minimum gap in the range of 0.1 to 3.0 mm. preferably from 0.2 to 1.0 mm, and thus always has a minimum volume flow during operation of the valve according to the invention. This makes it possible to realize the advantageous functional principle of a throttle. The valve disk can, in principle, have any desired outer contour, for example an outer contour known to the person skilled in the art or any possible, in particular conical outer contour.

Further, the actuating means preferably comprises a linear actuator, which is preferably arranged by means of at least one holder on the hollow body and which is connected directly or indirectly by means of a connection coupling with the valve stem. This indirect arrangement of the actuating means on the hollow body of the valve according to the invention opens up the provision of sufficient accessibility to essential actuating components, such as, for example, the connection coupling or further Fasteners. This sufficient accessibility also allows quick and easy attachment and removal of the actuating means, preferably by means of a changing device, even during operation of the headbox or the machine for producing a fibrous web.

Such a holder is disclosed in the German patent application DE ... of 30.04.2010 (HPA14850 DE - "MJII-V motor holder design") of the applicant. The disclosure of this German patent application is hereby made the subject of the present description.

Also, the linear actuator satisfies the need for a suitable drive in terms of a clear definition of the valve spatial end ranges and the valve characteristic curve transition point.

With regard to a holistic solution, the linear servomotor is preferably acted on by a control system in which a coordinated software with the corresponding valve characteristics is stored. The tuned software must know the special features of the valve characteristic, the exact position of the valve stem as well as various current process values. Depending on this data, the positioning and behavior of the software function are adjusted. And in a specific case, the tuned software in operation mode can provide a cross profile control for multi-axis actuator systems as well as a special flow control in purge mode.

Moreover, the linear actuator preferably has a positioning accuracy in a range of 2.5 microns (translation) and 32.4 '' (rotation), a certain travel of 10 to 50 mm, preferably from 20 to 40 mm, in particular of 30 mm , and / or a rotation angle of +/- 90 °. The stated properties of the linear servomotor are particularly advantageous when using the valve according to the invention in a headbox for a machine for producing a fibrous web.

The inlet opening of the valve according to the invention is preferably arranged in the hollow body such that its longitudinal axis intersects with the longitudinal axis of the hollow space of the hollow body at an intersection. This arrangement of the two longitudinal axes, the longitudinal axis of the inlet opening and the longitudinal axis of the cavity of the hollow body, causes a rotation-free, staupunktfreie and cavitation-free guidance of the fluid flow, in particular pulp suspension flow with the lowest possible pressure loss in the fluid flow, in particular pulp suspension flow. The cavity of the hollow body thus undergoes a central and staupunktsfreie flow without any swirl flow.

By definition, the longitudinal axis of the inlet opening of the valve according to the invention is the center vertical of the inlet opening. In addition, the valve according to the invention preferably has only one inlet opening having a longitudinal axis with an inlet channel upstream in the flow direction, the longitudinal axis of which may in turn be arranged coaxially or at an angle to the longitudinal axis of the inlet opening. The valve according to the invention has in the hollow body a main flow direction for the fluid flow, in particular pulp suspension flow, which runs substantially coaxially with the longitudinal axis of the hollow space of the hollow body.

The two longitudinal axes intersecting at the point of intersection, namely the longitudinal axis of the inlet opening and the longitudinal axis of the cavity of the hollow body, preferably have a cutting angle in the range from 60 to 120 °, preferably from 80 to 100 °, in particular from 85 to 95 °. The longitudinal axis of the inlet opening can thus be convergent to the flow main direction of the fluid flow in the hollow body (cutting angle> 90 °), perpendicular to the main flow direction of the fluid flow in the hollow body (cutting angle = 90 °) or divergent to the main flow direction of the fluid flow in the hollow body (cutting angle 90 °). These cutting angle ranges provide spatial advantages, in particular with regard to the immediate juxtaposition of a plurality of valves according to the invention and / or the arrangement with further components and groups, such as with the distributor, in particular the transverse distribution tube.

Furthermore, the fluid flow to be regulated, in particular partial fluid flow, is preferably a dilution water stream or white water stream which contains fractions of solids of a pulp suspension.

The valve according to the invention can also be used in an outstanding manner in a headbox for a machine for producing a fibrous web, in particular a paper, board or packaging paper web, from at least one fibrous stock suspension.

The headbox is hereby preferably designed as a sectioned dilution water headbox with a pitch width of N x 25 mm or N x 33.3 mm, wherein N is preferably a natural number, and at least one, preferably in each dilution water line at least one be arranged according to the invention valve.

Furthermore, the plurality of valves according to the invention are preferably functionally interconnected in selectable sections. They can be opened on the one hand, on the other hand closed. As a result, a multiple of volume flow and thus a cleaning function is achieved in the open sections. Another possibility is the change in the middle valve position during flushing in the direction closed. As a result, when the total flow rate is controlled constant, a pressure increase is generated in a corresponding transverse distribution pipe. If individual inventive valves or sections of valves according to the invention in this mode of operation are fully opened, a massive local increase in quantity is achieved. In this way, in turn, a cleaning effect.

The valve according to the invention can also be used in an outstanding manner in a machine for producing a fibrous web, in particular a paper, board or packaging paper web, from at least one fibrous stock suspension. The machine can be constructed according to the prior art and have all known machine areas.

Further features and advantages of the invention will become apparent from the following description of several preferred embodiments with reference to the drawings.

Show it

1 a valve characteristic K of a known valve for a liquid;

2 a schematic perspective view of a valve according to the invention for regulating a fluid flow, in particular a pulp suspension stream;

3 an exemplary and preferred valve characteristic of the valve according to the invention for regulating a fluid flow, in particular a pulp suspension stream;

4 a schematic longitudinal sectional view through that in the 2 illustrated valve according to the invention for regulating a fluid flow;

5 a schematic and partial plan view of the in the 2 illustrated valve according to the invention for regulating a fluid flow;

6 a schematic and exemplary illustration of the positions of the actuating means in the rinse mode; and

7 a schematic sectional view through a known sectioned dilution water headbox comprising at least one inventive valve for regulating a fluid flow.

The 2 shows a schematic perspective view of a valve according to the invention 1 for regulating a fluid flow 2 (Arrow), in particular a pulp suspension stream 2.1 (Arrow). The pulp suspension stream 2.1 For example, in a machine known to those skilled in the art 200 be led for the production of a fibrous web, in particular a paper, cardboard or packaging paper web (see. 7 ).

The valve 1 comprises a hollow body 3 with a substantially at least partially rotationally symmetric and a longitudinal axis 4.L (dashed line; double arrow) having cavity 4 , the only one, a longitudinal axis 5.L (dashed line) having inlet opening 5 , a variable and substantially rotationally symmetrical passage surface 6 and an outlet opening 7 has (see. 4 ). The passage area 6 generally has an annular contour.

The inlet opening 5 is a not further shown inlet channel 5.1 in the flow direction S (arrow) of the fluid flow 2 upstream. On the other hand is the outlet opening 7 an outlet channel 7.1 in the main flow direction H (arrow) of the fluid flow 2 subordinate (see also 4 ).

Furthermore, the valve comprises 1 one by means of an actuating means 10 coaxially in the cavity 4 of the hollow body 3 movable, the passage area 6 as a result of a displacement V (double arrow) changeable, preferably a valve disc 9 having and preferably rotationally symmetrical valve rod 8th (see again 4 ).

The actuating means 10 includes a linear actuator 11 that by means of a holder 12 on the hollow body 3 is arranged and by means of a connection coupling 13 with the valve rod 8th is directly connected. Such a holder 12 is disclosed in the German patent application DE ... dated 30.04.2010 (HPA14850 DE - "MJII-V engine mount design") of the applicant. The disclosure of this German patent application is hereby made the subject of the present description.

The linear servomotor 11 is from a not further illustrated control system 14 in which a tuned software 15 is stored with the corresponding valve characteristics K. In addition, the linear actuator has 11 a positioning accuracy G in a range of 2.5 microns ( Translation) or 32.4 '' (rotation), a certain travel s of 10 to 50 mm, preferably from 20 to 40 mm, in particular of 30 mm, and / or a rotation angle γ of +/- 90 °.

The 3 shows an exemplary and preferred valve characteristic K of the valve according to the invention for regulating a fluid flow, in particular a pulp suspension stream.

On the abscissa, the valve opening Ö of the valve according to the invention is plotted in percent, on the ordinate, however, the open cross-section Q of the valve according to the invention is plotted in percent.

It is clear that the valve has two functional areas I . II having. The first functional area I represents an operating mode MI with a linear or approximately linear valve characteristic K, the second functional area II on the other hand represents a rinse mode M.II with a non-linear, preferably abruptly rising valve characteristic K.

The cavity 4 of the hollow body 3 the valve according to the invention 1 is at least partially designed such that in the operating mode MI a valve opening Ö in the range of 0 to about 75% and an open cross-section Q of 5 to about 75%, preferably from 10 to about 75%, in particular from 15 to about 75%, of the maximum cross-section Qmax can be achieved. And in the purge mode M.II, a valve opening O of at least 75% and an open cross-section Q of at least 75% of the maximum cross-section are achieved (cf. 5 ).

The 4 shows a schematic longitudinal sectional view through that in the 2 illustrated inventive valve 1 for regulating a fluid flow 2 (Arrow), in particular a pulp suspension stream 2.1 (Arrow).

• – die eine Längsachse 5.L aufweisende Einlassöffnung 5 weist einen Durchmesser 5.D im Bereich von 10 bis 60 mm, vorzugsweise von 15 bis 50 mm, auf;
• – ein Übergangsbereich 16 weist einen Übergangswinkel β im Bereich von 60 bis 120°, vorzugsweise von 80 bis 100°, insbesondere von 85 bis 95° auf;
• – ein zylindrischer oder annähernd zylindrischer Bereich 17 weist einen Durchmesser 17.D im Bereich von 10 bis 60 mm, vorzugsweise von 15 bis 50 mm, und eine Länge 17.L im Bereich von 0,1 bis 50 mm, vorzugsweise von 0,1 bis 20 mm, auf;
• – der erste, den Spülmodus (M.II) darstellende Funktionsbereich (II), ist ein erster Konfusor (18), dessen Durchmesserverhältnis (18.V) Eintritt-Austritt (in Strömungsrichtung S (Pfeil)) im Bereich von 1 bis 2, vorzugsweise von 1,1 bis 1,5, liegen;
• – der zweite, sowohl den Betriebsmodus (M.I) als die veränderbare und im Wesentlichen rotationssymmetrische Durchtrittsfläche (6) darstellende Funktionsbereich (I) ist ein zweiter Konfusor (19), dessen Durchmesserverhältnis (19.V) Eintritt-Austritt (in Strömungsrichtung S (Pfeil)) im Bereich von 1,2 bis 4, vorzugsweise von 1,5 bis 2,5, liegen; und/oder
• – der Endbereich 20 des zweiten Konfusors 19 und ein zylindrischer oder annähernd zylindrischer Bereich 21 weisen einen Durchmesser 21.D im Bereich von 5 bis 30 mm, vorzugsweise von 10 bis 25 mm, insbesondere von 10 bis 20 mm, auf, wobei der zylindrische oder annähernd zylindrische Bereich 21 zudem eine Länge 21.L von 0,1 bis 50 mm, vorzugsweise von 2 bis 20 mm, aufweist.

The flow direction S (arrow) of the fluid flow 2 (Arrow), in particular pulp suspension stream 2.1 (Arrow) ordered areas of the cavity 4 of the hollow body 3 the valve according to the invention 1 have at least one of the following properties:

• - the one longitudinal axis 5.L having inlet opening 5 has a diameter 5.D. in the range of 10 to 60 mm, preferably 15 to 50 mm;
• - a transition area 16 has a transition angle β in the range of 60 to 120 °, preferably from 80 to 100 °, in particular from 85 to 95 °;
• - A cylindrical or approximately cylindrical area 17 has a diameter 17.D in the range of 10 to 60 mm, preferably 15 to 50 mm, and a length 17.L in the range of 0.1 to 50 mm, preferably from 0.1 to 20 mm;
• The first functional area representing the rinse mode (M.II) ( II ), is a first confuser ( 18 ), whose diameter ratio ( 18.V ) Inlet exit (in the flow direction S (arrow)) in the range of 1 to 2, preferably from 1.1 to 1.5;
• The second, both the operating mode (MI) and the changeable and substantially rotationally symmetrical passage area (FIG. 6 ) functional area ( I ) is a second confuser ( 19 ), whose diameter ratio ( 19.V ) Inlet exit (in the flow direction S (arrow)) in the range from 1.2 to 4, preferably from 1.5 to 2.5; and or
• - the end area 20 of the second confuser 19 and a cylindrical or approximately cylindrical area 21 have a diameter 21.D in the range of 5 to 30 mm, preferably 10 to 25 mm, in particular 10 to 20 mm, wherein the cylindrical or approximately cylindrical portion 21 also has a length 21.L from 0.1 to 50 mm, preferably from 2 to 20 mm.

Also, the valve plate points 9 the preferably rotationally symmetrical valve rod 8th a smaller diameter 9.D as the end area 20 of the second confuser 19 and the cylindrical or approximately cylindrical portion 21 (Diameter 21.D ), so that a variable throttle 22 is formed, which constantly a minimum gap 22.s in the range of 0.5 to 1.5 mm, preferably from 0.5 to 1.0 mm, in particular of about 0.75 mm, and thus during operation of the valve according to the invention 1 always has a minimum volume flow Vmin.

Furthermore, the inlet opening 5 in the hollow body 3 arranged such that its longitudinal axis 5.L (dashed line) with the longitudinal axis 4.L (dashed line, double arrow) of the cavity 4 of the hollow body 3 intersects at an intersection P (cf. 5 ). The longitudinal axis 5.L the inlet opening 5 is by definition the center vertical M of the inlet opening 5 ,

The two intersecting in the intersection P longitudinal axes 4.L (dashed line; double arrow), 5.L (dashed line) have a cutting angle α in the range of 60 to 120 °, preferably from 80 to 100 °, in particular from 85 to 95 °. The longitudinal axis 5.L (dashed line) of the inlet opening 5 Thus, it can converge to the main flow direction H (arrow) of the fluid flow 2 in the hollow body 3 (Intersection angle α> 90 °), perpendicular to the main flow direction H (arrow) of the fluid flow 2 in the hollow body 3 (Intersection angle α = 90 °) or divergent to the main flow direction H (arrow) of the fluid flow 2 in the hollow body 3 (Cutting angle α <90 °). In the illustrated embodiment, the intersection angle α assumes a value of 90 °, the two intersecting longitudinal axes 4.L (dashed line; double arrow), 5.L (dashed line) thus run perpendicular to each other.

And the cavity 4 of the hollow body 3 is also designed such that the one flow main direction H (arrow) having fluid stream 2 , in particular pulp suspension stream 2.1 free from stagnation or almost free of stagnation and rotation-free or nearly free of rotation with respect to the longitudinal axis 4.L (dashed line, double arrow) of the cavity 4 flows through him. The cavity 4 of the hollow body 3 So experiences a central and Staupunktsfreie flow without any swirl flow.

The 5 shows a schematic and partial plan view of the in the 2 illustrated inventive valve 1 for regulating a fluid flow 2 (Arrow).

Also in this plan view can be seen that the inlet opening 5 in the hollow body 3 is arranged such that its longitudinal axis 5.L (Dot) with the longitudinal axis 4.L (dashed line, double arrow) of the cavity 4 of the hollow body 3 at an intersection P intersects, and that the cavity 4 of the hollow body 3 is formed such that the fluid flow having a flow main direction H (arrow) 2 , in particular pulp suspension stream 2.1 free from stagnation or almost free of stagnation and rotation-free or nearly free of rotation with respect to the longitudinal axis 4.L of the cavity 4 flows through him.

The 6 shows a schematic and exemplary representation of the positions of the actuating means in the rinsing mode.

On the abscissa, the valve numbers n of the n valves according to the invention are plotted, on the ordinate, however, the valve opening Ö of the respective valve according to the invention is plotted in percent.

In selectable sections, the valve movements are interconnected via the actuators and on the one hand opened and on the other hand closed. As a result, a multiple of volume flow and thus a cleaning function is achieved in the open sections.

The 7 shows a schematic sectional view through a known sectioned dilution water headbox 100 comprising a plurality of mutually spaced valves according to the invention 1 for regulating a fluid flow 2 . 2.T includes.

The illustrated sectioned dilution water headbox 100 is part of a non-illustrated, but known to the expert machine 200 for producing a fibrous web, in particular a paper, board or packaging paper web, from at least one pulp suspension. It comprises at least one pulp suspension 101 feeding feeding device 102 and a turbulence generating means 103 in which during operation of the dilution water headbox 100 the at least one pulp suspension 101 by a plurality of flow channels arranged in rows and in columns 104 flows, thereby divided in a flow direction having pulp suspension sub-streams and after exiting the turbulence generating means 103 in a preferably machine-wide chamber 105 is brought together again.

• 1. DE 10 2008 054 893.6 vom 18.12.2008: HPA14251 DE – „MJ II-3-Spalten”;
• 2. DE 10 2008 054 894.4 vom 18.12.2008: HPA14252 DE – „MJ II-EdgeModule”;
• 3. DE 10 2008 054 896.0 vom 18.12.2008: HPA14253 DE – „MJ II-Druckverlustverteilung”;
• 4. DE 10 2008 054 897.9 vom 18.12.2008: HPA14263 DE – „MJ II-Schichtenlose Hilfsstoffzugabe”;
• 5. DE 10 2008 054 898.7 vom 18.12.2008: HPA14265 DE – „MJ II-DoS-TE-Geometrie”;
• 6. DE 10 2008 054 899.5 vom 18.12.2008: HPA14310 DE – „MJ II-Verteilrohrlochplattendicke”;
• 7. DE 10 2009 027 013.2 vom 18.06.2009: HPA14466 DE – „MJ II-W-STA”; und
• 8. DE 10 2009 027 721.8 vom 15.07.2009: HPA14569 DE – „MJ II-W-STA (Dosierrohr)”.

Upstream of the turbulence generating means 103 are a plurality of respective longitudinal direction and spaced apart in the width direction of the headbox means 106 for preferably controllable metered addition of a fluid 2 in partial fluid streams 2.T in the at least one pulp suspension 101 intended. With regard to the constructional and functional design of the means, reference is made to the following eight German patent applications of the applicant, the disclosure contents of which are hereby made the subject of the present description:

• 1. DE 10 2008 054 893.6 of 18.12.2008: HPA14251 EN - "MJ II-3 columns";
• Second DE 10 2008 054 894.4 dated 18.12.2008: HPA14252 EN - "MJ II EdgeModule";
• Third DE 10 2008 054 896.0 dated 18.12.2008: HPA14253 EN - "MJ II pressure loss distribution";
• 4th DE 10 2008 054 897.9 dated 18.12.2008: HPA14263 EN - "MJ II-Slat-free adjuvant addition";
• 5th DE 10 2008 054 898.7 dated 18.12.2008: HPA14265 EN - "MJ II-DoS-TE-Geometry";
• 6th DE 10 2008 054 899.5 dated 18.12.2008: HPA14310 EN - "MJ II distribution well plate thickness";
• 7th DE 10 2009 027 013.2 dated 18.06.2009: HPA14466 EN - "MJ II-W-STA"; and
• 8th. DE 10 2009 027 721.8 dated 15.07.2009: HPA14569 EN - "MJ II-W-STA (dosing tube)".

The illustrated dilution water headbox 100 preferably has a pitch width T (section width) of the means 106 of N x 25 mm or N x 33.3 mm, where N is preferably a natural number.

The valve according to the invention 1 thus serves to regulate the fluid flow 2 , in particular the partial fluid flow 2.T , In the illustrated embodiment, the fluid flow 2 , especially Pulp suspension flow 2.1 a dilution water stream or white water stream containing solids fractions of a pulp suspension.

Also, several valves of the invention 1 be functionally interconnected in preferably freely selectable sections.

In summary, it should be noted that a valve of the aforementioned types is provided by the invention, which reduces the disadvantages of the prior art as far as possible, preferably even completely avoids. In particular, the possibility of a flushing function is created in one and the same valve. The rinsing function can be realized in particular in the short-term circulation mode [of the machine for producing a fibrous web] and / or before a cleaning stop.

LIST OF REFERENCE NUMBERS

1

Valve

2

Fluid flow (arrow)

2.1

Pulp suspension stream (arrow)

2.T

Fluid part stream

3

hollow body

4

cavity

4.L

Longitudinal axis (dashed line; double arrow)

5

inlet port

5.1

inlet channel

5.D.

diameter

5.L

Longitudinal axis (dashed line)

6

Passage area

7

outlet

7.1

exhaust port

8th

valve rod

9

valve disc

9.D

diameter

10

actuating means

11

Linear actuator

12

bracket

13

connection coupling

14

control system

15

Coordinated software

16

Transition area

17

Area

17.D

diameter

17.L

length

18

First confuser

18.V

Diameter ratio

19

Second confuser

19.V

Diameter ratio

20

end

21

Area

21.D

diameter

21.L

length

22

Variable throttle

22.s

minimum gap

100

Dilution water headbox

101

Fibrous suspension

102

feeder

103

Turbulence generator

104

flow channel

105

chamber

106

Means for preferably controllable metered addition of a fluid in partial fluid streams in the at least one pulp suspension

200

Machine for producing a fibrous web

G

positioning

H

Main direction of flow

I

First functional area

II

Second functional area

K

Valve characteristic

M

vertical center

M.I.

operation mode

M.II

Rinse mode

N

Natural number

n

valve number

Ö

valve opening

P

intersection

Q

Open cross section

Qmax

Maximum open cross-section

S

Flow direction (arrow)

s

traverse

T

Division width (section width)

V

Shift (double arrow)

Vmin

Minimum flow rate

α

cutting angle

β

Transition angle rotation angle

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 0633416 A1 [0002, 0005, 0006]
• EP 0633352 B1 [0005]
• DE 19949067 C1 [0005]
• EP 1591585 B1 [0005]
• DE 102008054893 [0063]
• DE 102008054894 [0063]
• DE 102008054896 [0063]
• DE 102008054897 [0063]
• DE 102008054898 [0063]
• DE 102008054899 [0063]
• DE 102009027013 [0063]
• DE 102009027721 [0063]

Claims (14)

Valve ( 1 ) for regulating a fluid flow ( 2 ), in particular one preferably in a machine ( 200 ) for producing a fibrous web, in particular a paper, board or packaging paper web, guided pulp suspension stream ( 2.1 ), comprising a hollow body ( 3 ) with a substantially at least partially rotationally symmetrical and a longitudinal axis ( 4.L ) having cavity ( 4 ), the at least one, a longitudinal axis ( 5.L ) having inlet opening ( 5 ) with an inlet channel ( 5.1 ), a variable and substantially rotationally symmetrical passage surface ( 6 ) and an outlet opening ( 7 ) with an outlet channel ( 7.1 ), and one preferably by means of at least one actuating means ( 10 . 11 ) coaxially in the cavity ( 4 ) of the hollow body ( 3 ) displaceable, the passage surface ( 6 ) as a result of a displacement (V) variable, in particular a valve disc ( 9 ) and preferably rotationally symmetrical valve rod ( 8th ), characterized in that it has at least two functional areas ( I . II ), wherein the first functional area ( I ) an operating mode (MI) with a linear or approximately linear valve characteristic (K) and wherein the second functional range ( II ) represents a purge mode (M.II) with a non-linear, preferably abruptly rising valve characteristic (K). Valve ( 1 ) according to claim 1, characterized in that the cavity ( 4 ) of the hollow body ( 3 ) is at least partially designed such that in the operating mode (MI) a valve opening (Ö) in the range of 0 to about 75% and an open cross-section (Q) of 5 to about 75%, preferably from 10 to about 75%, in particular from 15 to about 75% of the maximum open cross-section (Qmax). Valve ( 1 ) according to claim 1 or 2, characterized in that the cavity ( 4 ) of the hollow body ( 3 ) is at least partially designed such that in the rinse mode (M.II) a valve opening (Ö) of at least 75% and an open cross-section (Q) of at least 75% of the maximum open cross-section (Qmax) can be achieved. Valve ( 1 ) according to one of the preceding claims, characterized in that in the flow direction (S) of the fluid flow ( 2 ), in particular pulp suspension stream ( 2.1 ) ordered areas of the cavity ( 4 ) of the hollow body ( 3 ) have at least one of the following properties: - the one longitudinal axis ( 5.L ) having inlet opening ( 5 ) has a diameter ( 5.D. ) in the range of 10 to 60 mm, preferably 15 to 50 mm; - a transitional area ( 16 ) has a transition angle (β) in the range of 60 to 120 °, preferably from 80 to 100 °, in particular from 85 to 95 °; A cylindrical or approximately cylindrical area ( 17 ) has a diameter ( 17.D ) in the range of 10 to 60 mm, preferably 15 to 50 mm, and a length ( 17.L ) in the range of 0.1 to 50 mm, preferably from 0.1 to 20 mm; The first functional area representing the rinse mode (M.II) ( II ) is a first confuser ( 18 ), whose diameter ratio ( 18.V ) Inlet exit in the range of 1 to 2, preferably from 1.1 to 1.5; The second, both the operating mode (MI) and the changeable and substantially rotationally symmetrical passage area (FIG. 6 ) performing functional area (i) is a second confuser ( 19 ), whose diameter ratio ( 19.V ) Inlet exit in the range of from 1.2 to 4, preferably from 1.5 to 2.5; and / or the end region ( 21 ) of the second confuser ( 19 ) and a cylindrical or approximately cylindrical region ( 22 ) have a diameter ( 22.D ) in the range from 5 to 30 mm, preferably from 10 to 25 mm, in particular from 10 to 20 mm, the cylindrical or approximately cylindrical region ( 22 ) also a length ( 22.L ) of 0.1 to 50 mm, preferably from 2 to 20 mm. Valve ( 1 ) according to claim 4, characterized in that the valve disc ( 9 ) of the preferably rotationally symmetrical valve rod ( 8th ) a smaller diameter ( 9.D ) as the end region ( 21 ) of the second confuser ( 19 ) and the cylindrical or approximately cylindrical region ( 22 ), so that a variable throttle ( 23 ) is formed, which constantly a minimum gap ( 23.s ) in the range of 0.5 to 1.5 mm, preferably of 0.5 to 1.0 mm, in particular of about 0.75 mm, and thus during operation of the valve ( 1 ) always has a minimum volume flow (Vmin). Valve ( 1 ) according to one of the preceding claims, characterized in that the actuating means ( 10 ) a linear actuator ( 11 ), which preferably by means of at least one holder ( 12 ) on the hollow body ( 3 ) is arranged and by means of a connection coupling ( 13 ) with the valve rod ( 8th ) is directly or indirectly connected. Valve ( 1 ) according to claim 6, characterized in that the linear actuator ( 11 ) of a control system ( 14 ), in which a coordinated software ( 15 ) with the corresponding valve characteristics (K) is deposited. Valve ( 1 ) according to claim 6 or 7, characterized in that the linear servomotor ( 11 ) a positioning accuracy (G) in a range of 2.5 μm or 32.4 ", a certain travel (s) of 10 to 50 mm, preferably 20 to 40 mm, in particular 30 mm, and / or a rotation angle (γ) of +/- 90 °. Valve ( 1 ) according to one of the preceding claims, characterized in that the inlet opening ( 5 ) in the hollow body ( 3 ) is arranged such that its longitudinal axis ( 5.L ) with the longitudinal axis ( 4.L ) of the cavity ( 4 ) of the hollow body ( 3 ) at an intersection (P). Valve ( 1 ) according to claim 11, characterized in that the two intersecting in the intersection (P) longitudinal axes ( 4.L . 5.L ) have a cutting angle (α) in the range of 60 to 120 °, preferably from 80 to 100 °, in particular from 85 to 95 °. Headbox ( 100 ) for a machine ( 200 ) for producing a fibrous web, in particular a paper, board or packaging paper web, from at least one fibrous stock suspension ( 101 ), characterized in that it comprises at least one valve ( 1 ) according to one of claims 1 to 10. Headbox ( 100 ) according to claim 11, characterized in that it serves as a sectioned dilution water headbox ( 100 ) is formed with a pitch width (T) of N x 25 mm or N x 33.3 mm, where N is preferably a natural number, and that in at least one, preferably in each dilution water line at least one valve ( 1 ) is arranged according to one of claims 1 to 10. Headbox ( 100 ) according to claim 11 or 12, characterized in that it comprises a plurality of valves ( 1 ) according to one of claims 1 to 10, which are functionally interconnectable in selectable sections. Machine ( 200 ) for producing a fibrous web, in particular a paper, board or packaging paper web, from at least one fibrous stock suspension ( 101 ), characterized in that it comprises at least one valve ( 1 ) according to one of claims 1 to 10.

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