CA2127408C - Device and method for the non-clogging throttling of a fluid stream of suspended matter - Google Patents
Device and method for the non-clogging throttling of a fluid stream of suspended matter Download PDFInfo
- Publication number
- CA2127408C CA2127408C CA002127408A CA2127408A CA2127408C CA 2127408 C CA2127408 C CA 2127408C CA 002127408 A CA002127408 A CA 002127408A CA 2127408 A CA2127408 A CA 2127408A CA 2127408 C CA2127408 C CA 2127408C
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- Prior art keywords
- fluid
- hollow body
- fluid flow
- section
- longitudinal axis
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/02—Head boxes of Fourdrinier machines
- D21F1/022—Means for injecting material into flow within the headbox
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/06—Regulating pulp flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
- F15D1/02—Influencing flow of fluids in pipes or conduits
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Paper (AREA)
- Medicines Containing Plant Substances (AREA)
- Disintegrating Or Milling (AREA)
- Taps Or Cocks (AREA)
- Sliding Valves (AREA)
- Multiple-Way Valves (AREA)
- Safety Valves (AREA)
Abstract
The invention relates to a valve or throttling device for a fluid flow, and particularly a flow containing solids, like a flow of pulp suspension. The valve has the following features: A hollow body of substantially rotational symmetry, which is traversed by liquid; the hollow body has a variable passage area which is substantially of rotational symmetry; and a main direction of fluid flow which is substantially axial to the longitudinal axis of the hollow body is provided in the hollow body. A liquid feed to the passage area is provided so that a component of rotation around the direction of the main stream is added to the liquid with reference to the direction of the main stream.
Description
DEVICE AND MBTHOD FOH THE NON-CLOfiGINt3 THROTTLING
OF 71 FLiIID $TRg7Vt DZ' SUSPENDED MhTTER
B1~CRGROUND OF THE INVENTION
The present invention relates to a device and a method far the ncn-clogging throttling of a fluid Stream, particu?arlv a stream of suspended pulp in a paper machine or a pulp preparation plant.
Valves of many different types are known in the prior art for throttling fluid streams, including ball valves, flap valves, needle valves, and the like. An essential disadvantage of these valves is that they provide relativ~a narrow cross sections for establishing a desired rate of Ilow. It is Known that narrow cross sections tend to clog in an undQxirable msnnex upon tho passage or pulp suspensions and, upon theix use in paper making machines, they procuce fiber uripi.ngs, local accumulations of fibers and deposits. This either results in clegging of the valvo or elc~ fiber wipingc or deposits are not bro:~ten up again before the start of the sheet forming process duo to the absence of the influence of shearing forces. As a xesult, in the most favoxabhe case, formation flown are formed in the paper web.
However, experience shows that these non-homogeneous elements in the sheet are fregutntly the starting point for tearing of the entire web of paper and they thus lead to. significant disturbances in the operation of a paper machine.
srrx11i2;32 .._ - 2 2l~'~40'~
S',TMI'2ARY. OIL' THE I:WENTION
The object of the invention is to provide a z°alva or a throttle member, in which t'rrQ formation of fiber wipings and/or the danger of clogging is avo~,ded by a suitable design.
The invention concerns a valve or throttling devioe for a fluid stream, particularly a solid conducting stream, and more particularly a fluid stream of pulp suspension in the headbox of the paper making machine. The valve or throttling device includes a t hollow body of s~,:bstantially rotational sy:nnetry having a longitudinal axis along the direction of liquid flow through the body. The hollow body also includes a variable cross section passage area which is of substar_tially rotational symmetry. A throttle piece may be provided in the body to defin8 a narrow cross section annular throttle region through which the solid conducting stream passes and where the solid conducting stream rnigrt be blocked. Means, e.g. in the form of 2o tangential inlet flow to the hollow body, era provided to impart a rotary component of flaw to tl~e liquid being fed into the hollow body and being fed peat the throttle area of the body, so that the liquid has a rotary component around th= direction cf the main stream as the r.~tain stream moves through the hollow body to the outlet from the throttle device. othor means may be pro'trided for providing the rotary component ~.o the liquid flow. For example, the inner surfaces of the respective devices are to be grovided with e.g. helical grooves, guide vanes etc. which cause xota,tion Or the liquid.
The invention also concerns the method of reaucing clogs in a valve or throttling crevice through spEC~82132 3 - 212'7~U
imparting the rotary component of motion to the liquid stream passing through the hollow body.
The inventors have recognized that the tenderiCy of a valve toward clogging can be considerably reduced.
particularly in a type of valve construction which corresponds to a needle valve, if a rotary component is added to the flaw in the region of the narrowest point of the valve. The rotary component breaks up any turtaulences which may be present and also the fiber ip wipings and,/or fiber accumulations thereby produo~a, w:~ich might otrerwise lead to clogging.
Other features and advantagl~C of the pros~nt invention will become apparent from the following description of the -ynvontion which refers to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
fig. 1 is a diagrammatic cross section through a valve in accordance with the invention;
Fig. 2 is a section A-A through the valve oZ the ' irwention shoran in Fig. I;
Fig. 3 shows the ,ass of the valve or the invention in the pulp-suspension feed of a headbox.
DFTA_TT_,ED DESGRT_ TTON OF EMBODI;~,' ~E. TS OF TIdF INVkNTIDN
Fig. 1 is a cross-sectional view of a throttle device 1 in accordance with tho inv~ntion. In the diagrammatic showing, the throttle device includes a body which definss a cylindrical nollow e~pace of substantially rotational symmetry having a constriction 3. A fluid stream i~c fod in perpQndioular to the axis of the 3o cylindrical hollow space via an eccentrically arranged, radius parallel feed 4. The fluid stream S thus enters s~~8siaz - 4 - 21~"~~~~
the hollow space t,angentinlly and is there deflected towarw the axial direc~ion along the hollow space which dire~t~on is along the axis of the space. Triis imparts a spiral course to the stream S withir, the cylindrical hallow space. wi~hir. iris hollow space there .is also an axially arranged ray 2. IL is provided with a widening ors its lower side, which is the side facing the throttle ox constriction 3. The ram :~ is displaceable in the axial airection so that a narrowed annular restriction in cross Section similar to that provided by a needlQ valve i5 effected by axial displacement of the ram. In contrast to an ordinary naodlo va~.ve, however, the tangentially introduced stream s~;ffieiently flushes the narrowed constriction era that no clogging by solids entrained in the flow should occur at this point. This is partioularly advantageous in connection with streams of suspender. pulp .n paper machines in which such clogging, and therefore formations of fiber wipings, can have vexy unfavorable e~fects on the quality of the paper produced.
The liquid exits through an outlet at thQ
bottom of the body 1.
Fig. 2 is a cross suction A-A through the throttle Qevice of dig. Z. In the top view' shown, the tangential feed of the stream s into tho c~~lindxical inner space at the throttle device is clearly shown.
The invEntion is not lzmitod tc a purely tangential feed of the stream into the throttle space of a throttling device. 2t is also possible, for instance, o to use suitable ball elements to change the direction of the stroam fed within the entire solid angle so that, on the one hand, an angle other than 90° with respect to the mai:a axis og the throttling device can be adopted and at srnc~~~sax _ s _ the same time the eccentricity of the stream of pulp with respect to the axis of the cylindrical throttling device car. be controlled. In this weLy, simple control of the angle of the rotating flow spiral within the thrott.inq device is possible. As a result, on the one hand, t2-.e cleanwng effect can be controlled in a desired manner and, an the other hand, an add~.tional iriCredse or xedu4tion of the throttling is possible without the reduced passage area F having to be ;:rianged by moving or ZO changlnq the ram 2.
Furthermore, the fluid wetted surfaces may be surfaces for causing ratatien of the liquid. To da this, the inner surfaces of the respective devices are to be pravidod with e.g. helical groav4e, guides vanes etc.
which cause rotation of the liquid.
Fig. 3 chawa the use of the valve of Fige. 1 and 2, for example or the controlled feeding of dilution water into the main atr4am of tho pulp suspension in a paper machine headbox. T-~o cross-flow distributors Q1 and Q2 are shown, the pulp susponsion being fed in slightly increased concentration from the cross-flew distributor Q1 via a main line H to the headbox STA.
There are two distributors, each comprising a main pipe, extending in rne cross direction or the nachine and from open side of the headbox to the other one. Each main pipe is connected to a p~,u:ality or small diameter pipes, each of which generally is located in a vertical plane situated perpendicularly can the length axis of the main pipQ. Tha small diarn~ter pipes are 3o arranged one behind the other one, a5 se~ri In d Sl.de alevational view.
The two-distributor-versyon comprises two such distributors, urith the main pipes being located side by &w'BCSpZL3~
- ~ - 2~~'~~~~
tide and parallel to oaoh other, trh~raioy any one of the small d=ameter pipes of the second distributor is cor.neoted to one single one of the small diameter pipes of t:~e first distrib~.~tor. Normally, tre maid pipe of the 3 seoond distributor has a smaller diameter than the main pipe of the first distributor.
on the main line H, a feed of dilution water into the rain stream H at an angle other than 90° is shovrn. The feed consists essentially og the throt:.le 1o elemer_~t 2 itself, the throttle element having the same development as the one shown in fig. z and being connected via its feed Iine dire,otly to the second cross-flo~w distributor ~z rahlch conducts the dilution water.
~y tre correct selection of the angle batwraan the main 1~ stream H and the secondary stream N fed by the throttling dQVICA, tho rr~sult is obtain~d th-rt, xagaxdlacs pf the amount of the secondary stream N fed, the sum of the amount of suspension f~d to the headbox r~_n.ains constant.
By the development of the throttle d~2vice Z, any 2o formation of fiber wiping in the throttle devise ie avQ,~'.ded, avoiding reduction in the q~:ality of the paper produced. 1'he throttle device 7. is operated in such a nanner t:~at, at the normal operating point, an average amount of pulp suspension is fed by the throttle device 25 1, so that no settling processes o~ solids in the throttle device are possible. The regulation of the density of the pulp, and therefore of the concentration of the total suspension Zxom streams N and H, then takes placQ around this central operating point_ Ths sum of 3~ the total flow remains constant, and a verl~ sensitively adjusted regulaticn of the concentration is obtained as a result o: the canstracti~n of the throttle device 1.
sPrecvesi3Z
' - 2~.2'~~(3~
Although the prnsant inv~ntion hao~ boon described in relati4ri to a particular embodiment thereof, many other variations and mcdificatyone and other uses will became appaxer.t to those skilled in the art. It is pre~arrQd, t~xerefore, that the present invention be limited not by the apeci.~~_c discla5ure herein, but only by the. appended claims.
OF 71 FLiIID $TRg7Vt DZ' SUSPENDED MhTTER
B1~CRGROUND OF THE INVENTION
The present invention relates to a device and a method far the ncn-clogging throttling of a fluid Stream, particu?arlv a stream of suspended pulp in a paper machine or a pulp preparation plant.
Valves of many different types are known in the prior art for throttling fluid streams, including ball valves, flap valves, needle valves, and the like. An essential disadvantage of these valves is that they provide relativ~a narrow cross sections for establishing a desired rate of Ilow. It is Known that narrow cross sections tend to clog in an undQxirable msnnex upon tho passage or pulp suspensions and, upon theix use in paper making machines, they procuce fiber uripi.ngs, local accumulations of fibers and deposits. This either results in clegging of the valvo or elc~ fiber wipingc or deposits are not bro:~ten up again before the start of the sheet forming process duo to the absence of the influence of shearing forces. As a xesult, in the most favoxabhe case, formation flown are formed in the paper web.
However, experience shows that these non-homogeneous elements in the sheet are fregutntly the starting point for tearing of the entire web of paper and they thus lead to. significant disturbances in the operation of a paper machine.
srrx11i2;32 .._ - 2 2l~'~40'~
S',TMI'2ARY. OIL' THE I:WENTION
The object of the invention is to provide a z°alva or a throttle member, in which t'rrQ formation of fiber wipings and/or the danger of clogging is avo~,ded by a suitable design.
The invention concerns a valve or throttling devioe for a fluid stream, particularly a solid conducting stream, and more particularly a fluid stream of pulp suspension in the headbox of the paper making machine. The valve or throttling device includes a t hollow body of s~,:bstantially rotational sy:nnetry having a longitudinal axis along the direction of liquid flow through the body. The hollow body also includes a variable cross section passage area which is of substar_tially rotational symmetry. A throttle piece may be provided in the body to defin8 a narrow cross section annular throttle region through which the solid conducting stream passes and where the solid conducting stream rnigrt be blocked. Means, e.g. in the form of 2o tangential inlet flow to the hollow body, era provided to impart a rotary component of flaw to tl~e liquid being fed into the hollow body and being fed peat the throttle area of the body, so that the liquid has a rotary component around th= direction cf the main stream as the r.~tain stream moves through the hollow body to the outlet from the throttle device. othor means may be pro'trided for providing the rotary component ~.o the liquid flow. For example, the inner surfaces of the respective devices are to be grovided with e.g. helical grooves, guide vanes etc. which cause xota,tion Or the liquid.
The invention also concerns the method of reaucing clogs in a valve or throttling crevice through spEC~82132 3 - 212'7~U
imparting the rotary component of motion to the liquid stream passing through the hollow body.
The inventors have recognized that the tenderiCy of a valve toward clogging can be considerably reduced.
particularly in a type of valve construction which corresponds to a needle valve, if a rotary component is added to the flaw in the region of the narrowest point of the valve. The rotary component breaks up any turtaulences which may be present and also the fiber ip wipings and,/or fiber accumulations thereby produo~a, w:~ich might otrerwise lead to clogging.
Other features and advantagl~C of the pros~nt invention will become apparent from the following description of the -ynvontion which refers to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
fig. 1 is a diagrammatic cross section through a valve in accordance with the invention;
Fig. 2 is a section A-A through the valve oZ the ' irwention shoran in Fig. I;
Fig. 3 shows the ,ass of the valve or the invention in the pulp-suspension feed of a headbox.
DFTA_TT_,ED DESGRT_ TTON OF EMBODI;~,' ~E. TS OF TIdF INVkNTIDN
Fig. 1 is a cross-sectional view of a throttle device 1 in accordance with tho inv~ntion. In the diagrammatic showing, the throttle device includes a body which definss a cylindrical nollow e~pace of substantially rotational symmetry having a constriction 3. A fluid stream i~c fod in perpQndioular to the axis of the 3o cylindrical hollow space via an eccentrically arranged, radius parallel feed 4. The fluid stream S thus enters s~~8siaz - 4 - 21~"~~~~
the hollow space t,angentinlly and is there deflected towarw the axial direc~ion along the hollow space which dire~t~on is along the axis of the space. Triis imparts a spiral course to the stream S withir, the cylindrical hallow space. wi~hir. iris hollow space there .is also an axially arranged ray 2. IL is provided with a widening ors its lower side, which is the side facing the throttle ox constriction 3. The ram :~ is displaceable in the axial airection so that a narrowed annular restriction in cross Section similar to that provided by a needlQ valve i5 effected by axial displacement of the ram. In contrast to an ordinary naodlo va~.ve, however, the tangentially introduced stream s~;ffieiently flushes the narrowed constriction era that no clogging by solids entrained in the flow should occur at this point. This is partioularly advantageous in connection with streams of suspender. pulp .n paper machines in which such clogging, and therefore formations of fiber wipings, can have vexy unfavorable e~fects on the quality of the paper produced.
The liquid exits through an outlet at thQ
bottom of the body 1.
Fig. 2 is a cross suction A-A through the throttle Qevice of dig. Z. In the top view' shown, the tangential feed of the stream s into tho c~~lindxical inner space at the throttle device is clearly shown.
The invEntion is not lzmitod tc a purely tangential feed of the stream into the throttle space of a throttling device. 2t is also possible, for instance, o to use suitable ball elements to change the direction of the stroam fed within the entire solid angle so that, on the one hand, an angle other than 90° with respect to the mai:a axis og the throttling device can be adopted and at srnc~~~sax _ s _ the same time the eccentricity of the stream of pulp with respect to the axis of the cylindrical throttling device car. be controlled. In this weLy, simple control of the angle of the rotating flow spiral within the thrott.inq device is possible. As a result, on the one hand, t2-.e cleanwng effect can be controlled in a desired manner and, an the other hand, an add~.tional iriCredse or xedu4tion of the throttling is possible without the reduced passage area F having to be ;:rianged by moving or ZO changlnq the ram 2.
Furthermore, the fluid wetted surfaces may be surfaces for causing ratatien of the liquid. To da this, the inner surfaces of the respective devices are to be pravidod with e.g. helical groav4e, guides vanes etc.
which cause rotation of the liquid.
Fig. 3 chawa the use of the valve of Fige. 1 and 2, for example or the controlled feeding of dilution water into the main atr4am of tho pulp suspension in a paper machine headbox. T-~o cross-flow distributors Q1 and Q2 are shown, the pulp susponsion being fed in slightly increased concentration from the cross-flew distributor Q1 via a main line H to the headbox STA.
There are two distributors, each comprising a main pipe, extending in rne cross direction or the nachine and from open side of the headbox to the other one. Each main pipe is connected to a p~,u:ality or small diameter pipes, each of which generally is located in a vertical plane situated perpendicularly can the length axis of the main pipQ. Tha small diarn~ter pipes are 3o arranged one behind the other one, a5 se~ri In d Sl.de alevational view.
The two-distributor-versyon comprises two such distributors, urith the main pipes being located side by &w'BCSpZL3~
- ~ - 2~~'~~~~
tide and parallel to oaoh other, trh~raioy any one of the small d=ameter pipes of the second distributor is cor.neoted to one single one of the small diameter pipes of t:~e first distrib~.~tor. Normally, tre maid pipe of the 3 seoond distributor has a smaller diameter than the main pipe of the first distributor.
on the main line H, a feed of dilution water into the rain stream H at an angle other than 90° is shovrn. The feed consists essentially og the throt:.le 1o elemer_~t 2 itself, the throttle element having the same development as the one shown in fig. z and being connected via its feed Iine dire,otly to the second cross-flo~w distributor ~z rahlch conducts the dilution water.
~y tre correct selection of the angle batwraan the main 1~ stream H and the secondary stream N fed by the throttling dQVICA, tho rr~sult is obtain~d th-rt, xagaxdlacs pf the amount of the secondary stream N fed, the sum of the amount of suspension f~d to the headbox r~_n.ains constant.
By the development of the throttle d~2vice Z, any 2o formation of fiber wiping in the throttle devise ie avQ,~'.ded, avoiding reduction in the q~:ality of the paper produced. 1'he throttle device 7. is operated in such a nanner t:~at, at the normal operating point, an average amount of pulp suspension is fed by the throttle device 25 1, so that no settling processes o~ solids in the throttle device are possible. The regulation of the density of the pulp, and therefore of the concentration of the total suspension Zxom streams N and H, then takes placQ around this central operating point_ Ths sum of 3~ the total flow remains constant, and a verl~ sensitively adjusted regulaticn of the concentration is obtained as a result o: the canstracti~n of the throttle device 1.
sPrecvesi3Z
' - 2~.2'~~(3~
Although the prnsant inv~ntion hao~ boon described in relati4ri to a particular embodiment thereof, many other variations and mcdificatyone and other uses will became appaxer.t to those skilled in the art. It is pre~arrQd, t~xerefore, that the present invention be limited not by the apeci.~~_c discla5ure herein, but only by the. appended claims.
Claims (31)
1. A device for throttling a fluid stream containing solids, the device comprising:
a hollow body of substantially rotational symmetry and having a longitudinal axis, the body being traversed in an axial direction by the fluid stream;
the hollow body having a variable passage cross section which is of substantially rotational symmetry;
a means feeding the fluid stream to the passage area and a means for directing the fluid fed so that in addition to traveling substantially axially of the hollow body, the fluid has a rotary component around the main direction of the stream through the hollow body;
and the body having an outlet for the liquid.
a hollow body of substantially rotational symmetry and having a longitudinal axis, the body being traversed in an axial direction by the fluid stream;
the hollow body having a variable passage cross section which is of substantially rotational symmetry;
a means feeding the fluid stream to the passage area and a means for directing the fluid fed so that in addition to traveling substantially axially of the hollow body, the fluid has a rotary component around the main direction of the stream through the hollow body;
and the body having an outlet for the liquid.
2. The throttling device of claim 1, wherein the means for directing the fluid comprises the means for feeding the fluid to the throttling device communication into the hollow body generally tangentially to the body of rotational symmetry which is generally cylindrically shaped.
3. The throttling device of claim 1, including fluid wetted surfaces therein shaped and positioned for causing rotation of the fluid around the hollow body.
4. The throttling device of claim 1, further comprising a throttle piece in the hollow body for defining a narrowed cross section annular space between the throttle piece and the hollow body.
5. The throttling device of claim 4, wherein the body of rotational symmetry has a constriction in its cross section downstream in the fluid path of the throttle piece in the body.
6. A method for reducing the tendency toward clogging of a valve or throttling device, wherein the valve or throttling device has a hollow body of substantially rotational symmetry about a longitudinal axis;
the method comprising moving liquid through the body generally in a direction substantially axially with reference to the longitudinal axis of the hollow body;
imparting a rotary component to the liquid flow entering the body so that the liquid rotates in the body with respect to the axial direction of the liquid, and imparting the rotary component of motion to the liquid at least in a region of throttled cross section in the hollow body; and permitting the liquid to exit from the hollow body after passing the region of throttled cross section.
the method comprising moving liquid through the body generally in a direction substantially axially with reference to the longitudinal axis of the hollow body;
imparting a rotary component to the liquid flow entering the body so that the liquid rotates in the body with respect to the axial direction of the liquid, and imparting the rotary component of motion to the liquid at least in a region of throttled cross section in the hollow body; and permitting the liquid to exit from the hollow body after passing the region of throttled cross section.
7. The method of claim 6, wherein the rotary component is imparted to the liquid stream by supplying the liquid stream tangentially to the hollow body upstream of the throttled cross section.
8. The throttling device of claim 1 for use with a headbox for a paper making machine, the headbox having a pulp suspension feed thereto and an exit therefrom;
wherein the feed includes a throttling device, said device being positioned in the pulp suspension feed to the headbox.
wherein the feed includes a throttling device, said device being positioned in the pulp suspension feed to the headbox.
9. A throttle apparatus in a conduit for supplying a material suspension to the headbox of a paper machine with the following characteristics:
there is provided a rotationally symmetrical hollow body for fluid flow-through, the body having a longitudinal axis;
the hollow body including a narrowed region;
there is provided a main flow direction which in essence runs axially with the longitudinal axis of the hollow body; the apparatus is characterized by the following features;
a fluid supply is provided such that the fluid, relative to the main flow direction, is given a rotational component encircling the main flow direction, so that clogging is avoided.
there is provided a rotationally symmetrical hollow body for fluid flow-through, the body having a longitudinal axis;
the hollow body including a narrowed region;
there is provided a main flow direction which in essence runs axially with the longitudinal axis of the hollow body; the apparatus is characterized by the following features;
a fluid supply is provided such that the fluid, relative to the main flow direction, is given a rotational component encircling the main flow direction, so that clogging is avoided.
10. A throttle apparatus according to claim 9 characterized in that, the hollow body has a variable flow-through surface which is essentially rotationally symmetrical.
11. An apparatus according to claim 9, characterized in that, the supply of the throttle apparatus is disposed tangentially in a cylindrically configured space.
12. An apparatus according to one of claims 9 to 11, characterized in that, the fluid-wetted surface of the valve is at least partly provided with a structure which generates rotation in the fluid.
13. A process for reducing the clogging tendency of a valve or a throttle apparatus having a narrowed region and provided in a conduit for supplying a material suspension to a headbox of a paper machine, characterized in that, a rotational component relative to the main flow direction is added to the suspension in a region of throttled cross-section..
14. A process according to claim 13, characterized in that, the suspension flow is fed tangentially with respect to a longitudinal axis of the conduit.
15. A process according to claim 13 or 14, characterized in that, all generation of fibre wipings is avoided.
16. A method for reducing clogging of a valve or throttling device for a paper-making maching having a headbox, wherein the valve or throttling device has a hollow body of substantially rotational symmetry and having a longitudinal axis defining a main direction of fluid flow;
the method comprising the steps of:
moving fluid through the body generally in a direction substantially along the longitudinal axis of the hollow body;
imparting a rotary component to the fluid flow entering the body so that the fluid rotates in the body with respect to the longitudinal axis, and imparting said rotary component of motion to the fluid at least in a region of a throttled cross section in the hollow body, the region of throttled cross section being positioned in the pulp suspension feed to the headbox of the papermaking machine; and permitting the fluid to exit from the hollow body after passing the region of throttled cross section.
the method comprising the steps of:
moving fluid through the body generally in a direction substantially along the longitudinal axis of the hollow body;
imparting a rotary component to the fluid flow entering the body so that the fluid rotates in the body with respect to the longitudinal axis, and imparting said rotary component of motion to the fluid at least in a region of a throttled cross section in the hollow body, the region of throttled cross section being positioned in the pulp suspension feed to the headbox of the papermaking machine; and permitting the fluid to exit from the hollow body after passing the region of throttled cross section.
17. The method of claim 16, wherein the rotary component is imparted to the fluid flow by supplying the fluid flow tangentially to the hollow body upstream of the throttled cross section.
18. The method of claim 17, wherein the rotary component is imparted to the fluid flow by introducing the fluid into the hollow body at an inlet disposed eccentrically and substantially perpendicularly to the longitudinal axis of the hollow body.
19. A method for reducing clogging at a region of narrowed cross-section of a throttle device in a fluid line conveying a fluid flow to a headbox in a papermaking machine, the throttle device having a longitudinal axis and adapted for a main fluid flow in a direction of the longitudinal axis, the method comprising the step of:
imparting at least in the vicinity of the region of narrowed cross-section a rotational component to the fluid flow which is rotational about the direction of the main fluid flow, for reducing clogging of the throttle device by an accumulation of any suspensions in the fluid flow.
imparting at least in the vicinity of the region of narrowed cross-section a rotational component to the fluid flow which is rotational about the direction of the main fluid flow, for reducing clogging of the throttle device by an accumulation of any suspensions in the fluid flow.
20. The method of claim 19, wherein the imparting step comprises feeding the fluid flow in the throttle device in a direction tangential to the longitudinal axis.
21. The method of claim 19 wherein fibers are suspended in the fluid flow, and the fluid is fed so as to avoid fiber accumulation in the throttle device.
22. A device for throttling a fluid stream containing solids in a paper-making machine having a headbox, the device comprising:
a hollow body of substantially rotational symmetry and having a longitudinal axis, the body being traversed in the direction of the longitudinal axis by fluid and, the longitudinal axis defining a main direction of fluid flow;
the hollow body having a variable passage cross section which is of substantially rotational symmetry;
means feeding fluid to the passage area and for directing the fluid fed so that in addition to traveling substantially along the longitudinal axis of the hollow body, the fluid has a rotary component around the main direction of fluid flow through the hollow body; and the body having an outlet for the fluid;
the device being positioned in the pulp suspension feed to the headbox of the paper-making machine.
a hollow body of substantially rotational symmetry and having a longitudinal axis, the body being traversed in the direction of the longitudinal axis by fluid and, the longitudinal axis defining a main direction of fluid flow;
the hollow body having a variable passage cross section which is of substantially rotational symmetry;
means feeding fluid to the passage area and for directing the fluid fed so that in addition to traveling substantially along the longitudinal axis of the hollow body, the fluid has a rotary component around the main direction of fluid flow through the hollow body; and the body having an outlet for the fluid;
the device being positioned in the pulp suspension feed to the headbox of the paper-making machine.
23. The throttling device of claim 22, wherein the means for directing a rotary component to the fluid comprises the means feeding fluid to the throttling device communicating into the hollow body generally tangentially to the body of rotational symmetry which is generally cylindrically shaped.
24. The throttling device of claim 22, including fluid wetted surfaces therein shaped and positioned for causing rotation of the fluid around the hollow body.
25. The throttling device of claim 22, further comprising a throttle element in the hollow body for defining a narrowed cross section annular space in the hollow body between the throttle element and the hollow body around the throttle element.
26. The throttling device of claim 25, wherein the body of rotational symmetry has a constriction in its cross section downstream in the main direction of fluid flow of the throttle element in the body.
27. A throttle device for use in a fluid line conveying a fluid flow to a headbox in a papermaking machine, the throttle device comprising:
a substantially rotationally symmetric hollow body having a longitudinal axis and adapted for main fluid flow in a direction along the longitudinal axis, the hollow body having a region of narrowed cross-section;
means for imparting at least in the vicinity of the region of narrowed cross-section a rotational component to the fluid flow which is rotational about the direction of the main fluid flow, for avoiding obstructions by an accumulation of any suspensions in the fluid flow at the region of narrowed cross-section.
a substantially rotationally symmetric hollow body having a longitudinal axis and adapted for main fluid flow in a direction along the longitudinal axis, the hollow body having a region of narrowed cross-section;
means for imparting at least in the vicinity of the region of narrowed cross-section a rotational component to the fluid flow which is rotational about the direction of the main fluid flow, for avoiding obstructions by an accumulation of any suspensions in the fluid flow at the region of narrowed cross-section.
28. The throttle device of claim 27, wherein the hollow body has a fluid flow passage of variable cross-section which is substantially rotationally symmetric.
29. The throttle device of claim 27, wherein the imparting means includes means for feeding fluid to the throttle device in a direction tangential to the main fluid flow.
30. The throttle device of claim 27, wherein the imparting means comprises inner surfaces of the hollow body adapted to contact the fluid flow there-past, the inner surfaces being configured to impart a rotational component to the fluid flow past the inner surfaces.
31. A throttle device for use in a fluid line conveying a fluid flow to a headbox in a papermaking machine, the throttle device comprising:
a substantially rotationally symmetric hollow body having a longitudinal axis and adapted for a main fluid flow in a direction along the longitudinal axis, the hollow body having a region of narrowed cross-section;
a fluid flow device imparting at least in the vicinity of the region of narrowed cross-section a rotational component to the fluid flow which is rotational about the direction of the main fluid flow, for avoiding obstructions by an accumulation of any suspensions in the fluid flow at the region of narrowed cross-section.
a substantially rotationally symmetric hollow body having a longitudinal axis and adapted for a main fluid flow in a direction along the longitudinal axis, the hollow body having a region of narrowed cross-section;
a fluid flow device imparting at least in the vicinity of the region of narrowed cross-section a rotational component to the fluid flow which is rotational about the direction of the main fluid flow, for avoiding obstructions by an accumulation of any suspensions in the fluid flow at the region of narrowed cross-section.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4322321 | 1993-07-05 | ||
| DEP4322321.4 | 1993-07-05 | ||
| DEP4402516.5 | 1994-01-28 | ||
| DE4402516A DE4402516C2 (en) | 1993-07-05 | 1994-01-28 | Device and method for the non-clogging throttling of a fluid suspension flow |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2127408A1 CA2127408A1 (en) | 1995-01-06 |
| CA2127408C true CA2127408C (en) | 2001-09-18 |
Family
ID=25927393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002127408A Expired - Fee Related CA2127408C (en) | 1993-07-05 | 1994-07-05 | Device and method for the non-clogging throttling of a fluid stream of suspended matter |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0633416B1 (en) |
| JP (1) | JP2995712B2 (en) |
| AT (2) | ATE191266T1 (en) |
| CA (1) | CA2127408C (en) |
| DE (1) | DE9421889U1 (en) |
| FI (1) | FI102779B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29811054U1 (en) * | 1998-06-23 | 1998-09-17 | Bellmer Geb Kg Maschf | Suspension equalizer |
| DE102004039712B4 (en) * | 2004-08-17 | 2006-06-14 | Voith Paper Patent Gmbh | Reject flow control, from a used paper suspension sorting station, has a flow measurement point in front of a throttle linked to a control to set the delivery of a diluting fluid to prevent throttle blockages |
| DE202009002792U1 (en) | 2009-02-27 | 2009-04-30 | Voith Patent Gmbh | Valve arrangement and distributor unit for distribution of volume flows |
| DE102009014268B3 (en) * | 2009-03-20 | 2010-04-08 | Andritz Küsters Gmbh | Paper machine arrangement for manufacturing e.g. paper such as filter paper, has transverse flow distributers for respective material stream and dilution water, and valve provided at borehole for passage of flow amount to dilution water |
| DE102010001555A1 (en) | 2010-02-03 | 2011-08-04 | Voith Patent GmbH, 89522 | Valve for regulating a fluid flow |
| DE102010001557A1 (en) | 2010-02-03 | 2011-08-04 | Voith Patent GmbH, 89522 | Valve for regulating a fluid flow |
| DE102010028403A1 (en) | 2010-04-30 | 2011-11-03 | Voith Patent Gmbh | Valve for regulating a fluid flow |
| DE102010028404A1 (en) | 2010-04-30 | 2011-11-03 | Voith Patent Gmbh | Valve for regulating a fluid flow |
| DE102010028408A1 (en) | 2010-04-30 | 2011-11-03 | Voith Patent Gmbh | Valve for regulating a fluid flow |
| DE102010038891A1 (en) | 2010-08-04 | 2012-02-09 | Voith Patent Gmbh | Headbox for machine to manufacture e.g. packaging paper web from fibrous material suspension, has partial flow lines arranged adjacent to secondary feed device and arranged non-adjacent to intermediate channel and/or fluid metering units |
| CN103836206A (en) * | 2014-02-20 | 2014-06-04 | 武汉汽轮发电机有限公司 | Novel flow regulating valve for steam-turbine generator bearing |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3998244A (en) * | 1975-08-08 | 1976-12-21 | Clarence Bentley | Drip irrigation valve with helical flow path |
| JPS6469869A (en) * | 1987-09-10 | 1989-03-15 | Nippon Brown Coal Liquefaction | Valve for slurry |
| JPH07111035B2 (en) * | 1988-06-28 | 1995-11-29 | 日本製紙株式会社 | Headbox for paper machine |
-
1994
- 1994-01-28 DE DE9421889U patent/DE9421889U1/en not_active Expired - Lifetime
- 1994-06-15 AT AT96118580T patent/ATE191266T1/en active
- 1994-06-15 EP EP94109147A patent/EP0633416B1/en not_active Expired - Lifetime
- 1994-06-15 AT AT94109147T patent/ATE157434T1/en active
- 1994-07-04 FI FI943199A patent/FI102779B/en not_active IP Right Cessation
- 1994-07-05 JP JP6153449A patent/JP2995712B2/en not_active Expired - Fee Related
- 1994-07-05 CA CA002127408A patent/CA2127408C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE9421889U1 (en) | 1997-02-27 |
| JP2995712B2 (en) | 1999-12-27 |
| FI943199A (en) | 1995-01-06 |
| ATE191266T1 (en) | 2000-04-15 |
| JPH0881891A (en) | 1996-03-26 |
| FI102779B1 (en) | 1999-02-15 |
| FI102779B (en) | 1999-02-15 |
| EP0633416B1 (en) | 1997-08-27 |
| EP0633416A1 (en) | 1995-01-11 |
| CA2127408A1 (en) | 1995-01-06 |
| ATE157434T1 (en) | 1997-09-15 |
| FI943199A0 (en) | 1994-07-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20130705 |
|
| MKLA | Lapsed |
Effective date: 20130705 |