CN102365407A

CN102365407A - Flow pipe for a turbulence generator of the head box of a fiber web machine and a method for manufacturing a flow pipe for a turbulence generator of the head box of a fiber web machine and a turbulence generator of the head box of a fiber web machine

Info

Publication number: CN102365407A
Application number: CN2010800141067A
Authority: CN
Inventors: 亚尔莫·基尔韦斯迈斯; 扬内·拉皮
Original assignee: Metso Paper Oy
Current assignee: Valmet Technologies Oy
Priority date: 2009-03-27
Filing date: 2010-03-10
Publication date: 2012-02-29
Also published as: FI20095330A; EP2411579A1; EP2411579A4; WO2010109059A1; FI20095330A0; FI122600B

Abstract

The invention relates to a flow pipe for a turbulence generator (14) of the head box (10) of a fiber web machine. The flow pipe (17) includes two successive flow sections (18, 19) wherein the cross-sectional flow areas are unequal in size for forming a step (20). The flow pipe (17) including the step (20) is a component manufactured from one continuous pipe billet (21). The invention also relates to a method for manufacturing a flow pipe for a turbulence generator (14) of the head box (10) of a fiber web machine as well as a turbulence generator (14) of the head box (10) of a fiber web machine.

Description

Be used for fiber web machine head box turbulator the stream pipe, make the turbulator of head box of method and fiber web machine of stream pipe of the turbulator of the head box be used for fiber web machine

Technical field

The present invention relates to a kind of stream pipe of turbulator of the head box that is used for fiber web machine, this stream pipe comprises two stream sections in succession, and in these two stream sections, cross section flow region big or small unequal is with formation rank portions (step).The invention still further relates to a kind of manufacturing and be used for the method for stream pipe of turbulator of the head box of fiber web machine and a kind of turbulator of head box of fiber web machine.

Background technology

No. 110700 patents of Finland disclose a kind of tube flowing structure.In the head box of fiber web machine, use a plurality of stream pipes to form pipe row.Stream pipe comprises two stream sections in succession, and in these two stream sections, cross section flow region big or small unequal is with formation rank portion.Owing to making slurry stream, the existence of this rank portion separates, thus size degradation flocculate and make slurry produce turbulent flow in flowing efficiently with the stream tube wall.In above-mentioned patent, each stream pipe all is independently to flow section by two to constitute, and these stream sections are for example through being welded together.First-class section is to be processed by circular pipe fitting, and the second stream section is hydraulic pressure molded (hydromolded) parts.These stream sections link together through spacer sleeve.In the reality, above-mentioned spacer sleeve is welded on first-class section the end, holds this end, thereafter machined into is carried out on the surface of spacer sleeve, to form smooth connection in the flow-passing surface side.After this, the second stream section that hydraulic pressure is molded is installed on the sleeve, and is connected with this sleeve through welding.

Known stream pipe comprises many harsh production phases that require.At first, it comprises two independently welding step.Secondly, this connection must be absolute zero-clearance, and this just need carry out machined into.In addition, must convection section before connection accurately locating and adjust, be absolute straight to guarantee final stream pipe.In other words, the manufacturing of known stream pipe is wasted time and energy, and makes the inhomogenous stream pipe of quality easily, and this can have a negative impact to Headbox Operation, and then has influence on the quality of final products.A plurality of working stages also cause manufacturing cost higher, and impurity can accumulate in the stream pipe between the operating period.In addition, mainly due to the cause of machined into, too (optionally) strong pipe fitting must used for stress level in the manufacture process.So also increased the weight of turbulator, and material cost is increased.

Summary of the invention

The new-type stream pipe that the purpose of this invention is to provide a kind of turbulator of the head box that is used for fiber web machine, this stream pipe are easier to make with before comparing, and therefore can realize the structure of the absolute homogeneous of quality.Another object of the present invention provides the new method of stream pipe of turbulator that a kind of manufacturing is used for the head box of fiber web machine, and this method is compared more quick and easy with early stage (method).A further object of the present invention provides a kind of new-type turbulator that is used for the head box of fiber web machine, in this turbulator, the flow velocity of slurry stream and turbulent level with before compared more homogeneous.According to stream pipe of the present invention with turbulator is peculiar is characterised in that, the stream pipe that comprises rank portion is the parts that become by a continuous pipe system.Correspondingly, peculiar according to the method for the invention being characterised in that, the stream pipe that comprises rank portion is to be formed by a continuous pipe body.For example, stream pipe according to the present invention is easy to form through hydraulic pressure is molded.After hydraulic pressure was molded, the deburring (trimming) of stream tube end had been enough to reach requirement.The rank portion that is between the stream section promptly is shaped in the molded neutrality of hydraulic pressure, and ready at once immediately.The shape, the particularly shape of rank portion of stream pipe are exactly determined by the fluid die molding jig.Thus, can obtain to have the stream pipe of homogeneous quality.In addition, final stream pipe is absolute straight, and has no seam fully.

Description of drawings

With reference to the accompanying drawings the present invention is carried out detailed explanation, these accompanying drawings have demonstrated one embodiment of the present of invention, in the accompanying drawings

Fig. 1 illustrates the head box that comprises according to the fiber web machine of stream pipe of the present invention,

Fig. 2 a illustrates the pipe body that is used for according to stream pipe of the present invention,

Fig. 2 b illustrates according to final stream pipe of the present invention,

Fig. 2 c illustrates a part according to the profile diagram of stream pipe of the present invention and at the sectional view at three diverse location places.

The specific embodiment

Fig. 1 shows the principle of head box 10.Fibrous suspension is directed to balance cylinder 13 from collector 11 via pipe row 12.Be located at the turbulator of forming by some stream pipes 17 14 after the balance cylinder 13.Fibrous suspension flows to weir plate (slice) passage 15 forward from turbulator 14, and further flows to forming fabric (figure does not show).The weir plate passage is provided with stator (vane) 16 in addition.Any pressure variation from collector all reaches balance in pipe row, and in pipe row's the fluid remittance attenuator, to form flowing of homogeneous.In turbulator, the consistency profile of fibrous suspension becomes evenly, and any flocculate that in fibrous suspension, forms is all by size degradation.Flocculate by the shearing force that in flowing, is produced with turbulent flow and by cracked.Turbulent flow is enough to make fiber to keep separating and making the flocculate size degradation, but can not disturb online width of cloth material to be shaped.Being located at after the turbulator is the weir plate passage, and in this weir plate passage, the flow velocity of fibrous suspension increases to the running speed of fiber web machine.The weir plate passage is sized to and makes the turbulent flow that in turbulator, produces decay to if having time to be suitable for the level that width of cloth material was shaped before slice opening.

Therefore, the stream pipe is used in particular for the turbulator of the head box of fiber web machine.Fig. 2 b shows final stream pipe 17, and it comprises two stream sections 18 and 19 in succession.These flow the big or small unequal of section cross section flow region each other, can form the rank portion 20 of expectation thus.According to the present invention, the stream pipe 17 that comprises rank portion 20 is parts of being processed by a continuous pipe idiosome 21.Preferably, stream pipe 17 is through the molded formation of hydraulic pressure.Such parts are absolute straight, and have no seam fully.The size of these parts and geometry also are accurate.Pipe body 21 is shown in Fig. 2 a, and wherein, the flow direction of fibrous suspension is represented with arrow.In addition, can become by the pipe system that had than before thinner wall according to stream pipe of the present invention.In general, the wall intensity of stream pipe 17 is lower than 2mm, and it is molded so also to help carrying out hydraulic pressure.

Because operating condition is harsh, the general stainless steel that uses of stream pipe is made.Preferably use to compare to be easier to molded duplex steel, in the pipe body, realized moulding greatly and stretching in addition with stainless steel.Deplex stainless steel is corrosion-resistant, intensity is high and nickel content is very low.Because the high strength and the stretch-resistance of this material can be used this material under littler thickness.In addition, duplex steel is also more cheap than stainless steel usually.

Except that this new-type manufacturing approach, also molded according to stream pipe of the present invention and form its size according to new mode.At first, streamwise is in the 20-50% of time length of the stream section 19 of position for the total length of stream pipe 17, is preferably 25-35%.In other words, turbulent flow will be than before forming quickly and in shorter distance.The shear action that is produced by rank portion 20 is to take place suddenly, and it makes the flocculate size degradation effectively.

The streamwise stream section 19 that is in time the position comprises two

parts

22 and 23 so, traditionally.The cross section of first 22 is circular, and the cross section of second portion 23 is polygonal.In Fig. 2 c, show these cross sections clearly.According to the present invention,

part

22 and 23 length are about equally.Produce turbulent flow at first fully in the so just free second stream section after the portion of rank, afterwards, the geometry of the cross section flow region in the second portion 23 is changed to polygon smoothly from circle.The molded forming ability that is based on pipe body material of hydraulic pressure, and partly based on its stretch capability.Thus, the pipe body can be stretched and flow section to form second, and then forms rank portion.According to the present invention, the diameter of the first 22 of the second stream section 19 be first-class section 18 diameter 1.1-2.0 doubly, be preferably 1.2-1.5 doubly.Yet the difference on this diameter is enough to produce effective turbulent flow fully.In reality, fluid separates with the inner surface of stream pipe fully.

In hydraulic pressure was molded, that utilizes mould and supercharging medium was used for making the solid material moulding.This method produces smooth shape, thereby on wall in the tie point between stream section 18 and 19, stream pipe 17, forms two arc-shaped bends 24.According to the present invention, on the stream pipe internal surface, the radius of curvature r of two bendings is 0.2-2mm, is preferably 0.75-1.25mm.Subsequently, form (sharply) of enough racings and tie point does not have the rank portion of brink.In reality, particularly the second crooked inner corner portion can keep clean owing to the existence of this curvature.

In different application, the size of stream pipe can be different.In most of the cases, only make and severally be applicable to that the model of most of flow velocitys is just enough.Like needs, can to first-class section 18 inside be used to guarantee that the inhomogeneity sleeve 25 of flow distribution adjusts.In other words, can use the sleeve of different size to come the characteristic of convection tube to finely tune.This sleeve is preferably and is made of plastics.In the embodiment of a dimension, stream pipe range 600mm, in this case, first-class segment length 400mm, the second stream segment length 200mm.First-class section internal diameter is 20mm, and the internal diameter of the first of the second stream section is 24mm.

Thereby according to the present invention, the stream pipe 17 that comprises rank portion 20 is to be formed through hydraulic pressure is molded by a continuous pipe body 21.In the hydraulic pressure molding process, the shape of dimeric former is corresponding with final stream tube shape.The pipe body is placed in the mould, then with the mould reliably closing.In case of necessity, can the pipe body be flattened slightly, with adaptive with mould.Stretch out outside the mould slightly two ends of pipe body.Therefore, pipe body outline is longer than final stream pipe.The axle (Spindles) that will be used for sealing label pipe body and mould is pressed in each end of pipe body.When water during, for example can use the 2000bar pressure that applies in the inside of pipe body via this axle as medium.The pipe body is overlayed on mould in the several seconds by this pressure.If in mould, use the sleeve that dwindles, then can use a mould manufacturing to have the stream pipe of different-diameter.In addition, the diameter of pipe body is big more, then makes its moulding must be good more owing to the pressure surface zone is bigger.At last, the end of convection tube processes, and the stream pipe promptly completes after this.

Can turn round equably and realize turbulent flow fully according to the turbulator that is used for head box of the present invention (the stream pipe that wherein, has a rank portion is the fluid die member made that is become by a continuous pipe system).For example, if three row's formula turbulators of one 9 meters wide have 100 stream pipes in the distance of three meters width of each row, then relevant stream pipe quantity surpasses 10000 in the head box.In this case, can realize the remarkable saving of job costs and material cost simultaneously according to stream pipe of the present invention.Meanwhile, traditional littler of the weight ratio of turbulator.The stream pipe also is homogeneous aspect quality, even all is this turbulent level on the whole width of slice opening.

Claims

1. the stream pipe of the turbulator (14) of a head box (10) that is used for fiber web machine; This stream pipe (17) comprises two stream sections (18,19) in succession, in two said stream sections; Cross section flow region big or small unequal; To form rank portions (20), it is characterized in that the said stream pipe (17) that comprises said rank portions (20) is the parts of being processed by a continuous pipe body (21).

2. stream pipe as claimed in claim 1 is characterized in that, the said stream pipe (17) that comprises said rank portions (20) is the fluid die member made.

3. according to claim 1 or claim 2 stream pipe is characterized in that the wall thickness of said stream pipe (17) is less than 2mm.

4. like each described stream pipe among the claim 1-3, it is characterized in that said stream pipe (17) is stainless steel, be preferably the bigeminy steel.

5. like each described stream pipe among the claim 1-4; It is characterized in that the said stream section (19) that streamwise is in time position comprises two parts (22,23); Wherein the cross section of first (22) is circular, and the cross section of second portion (23) has polygonal shape.

6. stream pipe as claimed in claim 5 is characterized in that, the diameter of said first (22) be said first-class section (18) diameter 1.1-2.0 doubly, be preferably 1.2-1.5 doubly.

7. like each described stream pipe among the claim 1-6; It is characterized in that, in the link position of said stream section (18,19), on the wall of said stream pipe (17), have two arc-shaped bends (24); The radius of curvature of said two arc-shaped bends (24) is 0.2-2mm, is preferably 0.75-1.25mm.

8. a manufacturing is used for the method for stream pipe of turbulator (14) of the head box (10) of fiber web machine; Wherein in said stream pipe, form two stream sections (18,19) in succession, it is unequal that the cross section flow region of said two stream sections in succession is adjusted to size; To form rank portions (20); And in shaping, adopt hydraulic pressure molded, it is characterized in that the said stream pipe (17) that comprises said rank portions (20) is to be formed by a continuous pipe body (21).

9. turbulator (14) that is used for the head box (10) of fiber web machine; Said turbulator (14) comprises some stream pipes (17), and each said stream pipe all comprises two stream sections (18,19) in succession; The cross section flow region of said two stream sections in succession big or small unequal; To form rank portions (20), it is characterized in that the said stream pipe (17) that comprises said rank portions (20) is the parts of being processed by a continuous pipe body (21).

10. turbulator as claimed in claim 9 is characterized in that, said stream pipe (17) is like each described stream pipe (17) among the claim 2-7.