CN201695269U

CN201695269U - Turbulent flow generator

Info

Publication number: CN201695269U
Application number: CN2010202196292U
Authority: CN
Inventors: 扬内·拉皮; 朱安娜·卢米亚拉; 泰罗·佩尔西宁; 汉努·图尔佩宁
Original assignee: Metso Paper Oy
Current assignee: Valmet Technologies Oy
Priority date: 2009-06-02
Filing date: 2010-06-02
Publication date: 2011-01-05
Anticipated expiration: 2020-06-02
Also published as: FI8439U1; DE202010007422U1; FIU20090213U0

Abstract

The utility model relates to a turbulent flow generator which is used for a flow box of a fiber amplitude material manufacturing machine. The turbulent flow generator comprises a plurality of turbulent flow pipes, wherein at least one part of each turbulent flow pipe is provided with a throttling pipe; each throttling pipe is inserted into each turbulent flow pipe, so that the inlet end of each throttling pipe is arranged at the front end of each turbulent flow pipe; the outlet end of each throttling pipe is arranged in each turbulent flow pipe, so that the end of each throttling pipe is formed into jumping classification; each throttling pipe is provided with an independent combining ring; and the throttling pipe is fixed at the front end of each turbulent flow pipe through the combining ring. The turbulent flow generator can realize a beneficial turbulent flow generator structure.

Description

Turbulent flow generator

Technical field

The utility model relates to a kind of turbulent flow generator that is used for the flow box of fiber web maker.

Background technology

A kind of stream pipe has been described in Finnish patent document No.110700 Structure.A plurality of stream pipes are used to constitute pipe group (Rohrbatterie) in the flow box of fiber web maker.The stream pipe comprises two stream portions adjacent one another are, and this stream portion has the different big or small flow cross sections that are used to constitute jump classification (Stufensprung)

Because can making thin slice (Flocken) scatter effectively and make to flow, jump classification, the fibre stream of stream tube wall be in turbulence state.In described patent documentation, single stream pipe is made up of two independent stream portions, and described stream portion for example is engaged with each other together by welding.First-class portion is made of the rounded pipe of cross section, and the second stream portion is made of the shaped by fluid pressure body.These two parts by connector engages together.In practice, weld described joint around the end of first-class portion, subsequently, in order to realize and level and smooth stream interface

Connection, handle the end face of joint with cycling method.After this, the second stream portion of shaped by fluid pressure is set on this joint and with this joint and welds.

Known stream pipe needs a large amount of exigent operations.At first, need two independent welding processes at this.In addition, its connection must be definitely very close to each other, and need handle with cycling method.Stream portion must accurately mate before engaging and aim at, and the stream pipe of finishing thus just can have reliability.Generally speaking, the manufacturing of known stream pipe is extremely taken a lot of work, and the quality of the pipe of finishing can be unstable slightly, and this operation for flow box is unfavorable, and then can influence the quality of final products.A large amount of operations also causes manufacturing cost very high, and during operation at stream Guan Zhonghui accumulation dirt.In addition, mainly due to processing required in cycling method, will use in view of pressure stage does not during fabrication need so big thickness of pipe wall.Therefore this has increased the size of turbulent flow generator and then has increased material cost.

Summary of the invention

In view of the problems referred to above of the prior art, main purpose of the present utility model is to provide a kind of turbulent flow generator with flow box that is used for the fiber web maker of favourable structure, and it is simple in structure, and stable performance is easy to make, change, and is with low cost.

Principal character according to turbulent flow generator of the present utility model is that throttle pipe is provided with independent coupling collar (Bundring), and throttle pipe is fixed on the front end of turbulent pipe by this coupling collar.

The utility model provides a kind of turbulent flow generator that is used for the flow box of fiber web maker, it has the turbulent pipe of some, the fiber suspension passes the outlet side that described turbulent pipe is led to turbulent flow generator from the entrance side of turbulent flow generator, wherein, at least a portion of turbulent pipe has the throttle pipe (Drosselrohr) as insert, this throttle pipe is arranged on the inside of turbulent pipe, the arrival end of throttle pipe is set at the starting end (being front end) of turbulent pipe, and the port of export of throttle pipe is set in the turbulent pipe with this end generation jump classification at throttle pipe.Be provided with independent coupling collar on throttle pipe, throttle pipe is fixed on the front end of turbulent pipe by this coupling collar.In this article, the fiber web maker can be regarded as paper machine, board machine, cotton paper machine or pulp dryer.

Turbulent flow generator is used to make fiber suspension stream to be in flow regime, and this fiber suspension stream sprays (Aufspritzen) at the fiber suspension made sheets of fibres disperse before wet end in an advantageous manner.Because thin slice is less relatively, so the dispersion of thin slice needs strong microturbulence.Turbulent flow generator has numerous runner usually, produces boundary layer turbulence by wall friction in these runners, and sheets of fibres is separated from each other by this boundary layer turbulence and interconnecting with inner connection of sheets of fibres can become loose.Traditionally, the turbulent pipe of turbulent flow generator is made of the constant straight tube of diameter, can be provided with one or more stair-stepping cross sections extension outside this straight tube, promptly so-called jump classification (end difference, steps), flowing in these positions can slack-off and formation vortex.In known scheme, dissimilar insert (ring, throttle pipe etc.) is set in the turbulent pipe, and these inserts are used for by reducing the flox condition that cross-sectional area changes turbulent pipe

In according to scheme of the present utility model, in making turbulent flow generator, use accurate in size plastic tube (synthetic material pipe) as throttle pipe, wherein the shape of the end of plastic tube is made for and makes and can assemble independent coupling collar at this place, end.Can use a plurality of long throttle pipes that are made of plastics in according to scheme of the present utility model, it can't be manufactured into a member so far.

Particularly, the turbulent flow generator that is used for the flow box of fiber web maker of the present utility model can comprise a plurality of turbulent pipe, at least a portion of described turbulent pipe has throttle pipe, described throttle pipe is inserted in the described turbulent pipe, make the arrival end of described throttle pipe be arranged on the front end of described turbulent pipe, and the port of export of described throttle pipe is arranged in the described turbulent pipe and forms the jump classification with this end at described throttle pipe, an independent coupling collar wherein is set on described throttle pipe, and described throttle pipe is fixed to the front end of described turbulent pipe by this coupling collar.

Preferably, described throttle pipe and/or described coupling collar are plastics throttle pipe and/or plastic tie cyclization.

Preferably, described coupling collar by bonding be connected, threaded engagement connects or form fit connects and is fixed on the described throttle pipe.

Preferably, the rear end of the described turbulent pipe of described turbulent flow generator has roughly rectangular, parallelogram or trapezoidal shape of cross section.

Useful technique effect of the present utility model: by can realize a kind of favourable turbulent flow generator structure according to scheme of the present utility model, the while is in the flow design amount of flow box Be easy to change subsequently throttle pipe under the situation about changing.Can also reduce cavitation by configuration according to the inlet portion of throttle pipe of the present utility model (promptly anterior).Can reduce interference in the flow regime by configuration according to the outlet side (being the rear end) of turbulent flow generator turbulent pipe of the present utility model.

Description of drawings

Fig. 1 shows the flow box of fiber web maker.

Fig. 2 shows the turbulent pipe of flow box-turbulent flow generator.

Fig. 3 and Fig. 4 show the different embodiments of turbulent flow generator-throttle pipe.

Fig. 5 and Fig. 6 show the embodiment at the front end place of the throttle pipe of turbulent flow generator flow ports structure.

Fig. 7 and Fig. 8 show the embodiment of the rear end structure of turbulent flow generator-turbulent pipe.

The specific embodiment

Flow box 10 shown in Fig. 1 comprises: distributor 1; Turbulent flow generator 2, it has the numerous stacked on top of each other and turbulent pipe 3 that is arranged side by side; And flow box passage 4, its streamwise attenuates and stitches till 5 to outlet.Front end 3a in each turbulent pipe is provided with throttle pipe 7, and this throttle pipe extends to the inside of turbulent pipe 3, and till before the outlet of turbulent pipe or the rear end 3b, makes the expansion that forms flow cross section at this end position of throttle pipe 7, the classification 8 of promptly jumping.Outlet side in turbulent pipe 3 is provided with a plurality of thin plates 6, and these thin plates extend in flow box passage 4 and are separately fixed between two row stacked on top of each other of turbulent pipe 3.The front end 3a of turbulent pipe 3 preferably has circular cross section, and its rear end 3b preferably has rectangular cross section.Turbulent pipe 3 is usually by metal, and for example stainless steel is made.Throttle pipe can be by plastics, and for example PVC-C or POM make.

The fiber suspension is imported in the distributor 1 and rises from here on the whole width of flow box and distributes equably.Can reduce the inlet of turbulent pipe 3 or front end 3a and the flow velocity at the front end place of turbulent pipe 3 is changed by throttle pipe 7.In addition, throttle pipe 7 is used to quicken flowing before the jump classification 8 in the exit that is configured in throttle pipe 7.Slow down because the effect of jump classification 8 makes to flow, and form vortex in fluid, this can cause thin slice to disperse.After turbulent flow generator 2, flowing between the thin plate 6 of fiber suspension in flow box passage 4 and further stitching 5 by outlet flow on the forming net (not shown).

Fig. 2 shows the turbulent pipe 3 of the turbulent flow generator 2 that belongs to flow box 10, and this turbulent pipe 3 has front end 3a and rear end 3b, and the fiber suspension is directed in the pipe and is guided from this rear end 3b at this front end 3a and enters the flow box passage 4.The front end 3a of turbulent pipe 3 preferably has circular cross section, and that the rear end 3b of turbulent pipe 3 preferably has is rectangular basically, parallelogram or trapezoidal cross section.In the inside of turbulent pipe 3, in circular cross section section 31, fix a throttle pipe 7 that cross section is rounded, the external diameter of this throttle pipe 7 is approximately equal to the internal diameter of the circular cross section section 31 of turbulent pipe 3.Throttle pipe 7 has arrival end 7a and port of export 7b, is provided with independent coupling collar 11 (for example, collar, baffle ring etc.) at the arrival end 7a place of throttle pipe 7, and this coupling collar 11 is connected to throttle pipe 7 the front end 3a of turbulent pipe 3.For coupling collar 11 is set, be provided with (eingearbeitete) joint face 14 of for example handling at the arrival end 7a of throttle pipe 7, coupling collar 11 is fixed on this joint face 14.Preferably by bonding be connected, threaded engagement connects or form fit connects and realizes coupling collar 11 fixing on throttle pipe 7.The external diameter of coupling collar 11 is slightly larger than the external diameter of throttle pipe 7, on the running-on 3c that makes throttle pipe 7 join to be arranged in turbulent pipe 3.The flow ports 12 at the arrival end 7a place of throttle pipe 7 preferably has crooked shape.Between the end of throttle pipe 7 and turbulent pipe 3, form jump classification 8.Continue as the circular cross section section 31 of turbulent pipe after jump classification 8, the shape of cross section of the end sections of turbulent pipe is essentially rectangle, parallelogram or trapezoidal after this.

Fig. 3 shows the throttle pipe 7 that has arrival end 7a and port of export 7b according to of the present utility model.An independent coupling collar 11 is screwed in the arrival end 7a place of throttle pipe 7.Flow ports 12 at the arrival end 7a place of throttle pipe shown in Figure 37 preferably has the shape shown in Fig. 5.Different with Fig. 3 is that the coupling collar on throttle pipe also can be fixing by bonding.

Fig. 4 shows the throttle pipe 7 that has arrival end 7a and port of export 7b according to of the present utility model.Independent coupling collar 11 is by the arrival end 7a place that is fastened on throttle pipe 7 of form fit.In this case, coupling collar is made of two semiorbicular parts (not shown), when throttle pipe being inserted in the turbulent pipe 3, on the protuberance 13 that makes described parts be pressed against to be arranged in throttle pipe 7.Flow ports 12 at the arrival end 7a place of throttle pipe shown in Figure 47 preferably has the shape shown in Fig. 6.

Fig. 5 shows the shape at the flow ports 12 at the arrival end 7a place of the throttle pipe 7 of turbulent flow generator 2, and this flow ports is rotational symmetric and has radius of curvature R 1 and R2.Radius of curvature R 1 is preferably less than radius of curvature R 2.In this technical scheme, fluid can be from the more suitable cunning of distributor/more gently deflect into the throttle pipe 7 of turbulent pipe 3, therefore compares with the flow ports form of traditional inclination, and cavitation takes place still less.

Fig. 6 shows the shape at the flow ports 12 at the arrival end 7a place of the throttle pipe 7 of turbulent flow generator 2, and this flow ports is asymmetric herein and has radius of curvature R 1, R2, R3 and R4.The direction that the fiber suspension enters in the throttle pipe 7 is extended from bottom to top, at this, selects curvature like this, so that fluid turns in throttle pipe more neatly.Wherein, radius of curvature R 1, R2 are less than radius of curvature R 3, R4, and radius of curvature preferably increases along the flow direction of fiber suspension.

Fig. 7 shows the shape of cross section of parallelogram basically of rear end 3b of the turbulent pipe 3 of turbulent flow generator 2.Parallelogram in per herein two horizontal line is oriented opposite, but is directed in the same way certainly in all horizontal line.Turbulent pipe is stacked on top of each other along short transverse, makes its vertical walls extend each other with being offset.Can reduce thus to flow and disturb.

Fig. 8 show turbulent flow generator 2 turbulent pipe 3 rear end 3b be trapezoidal shape of cross section basically at this.Trapezoidal waist (Trapezschenkel) extends with opposite direction on width, wherein keeps angle [alpha] constant.

Below only describe several preferred implementation of the present utility model, for a person skilled in the art, can carry out modification within the scope of the appended claims in many ways.

Claims

1. turbulent flow generator (2) that is used for the flow box (10) of fiber web maker, this turbulent flow generator comprises a plurality of turbulent pipe (3), at least a portion of described turbulent pipe has throttle pipe (7), described throttle pipe (7) is inserted in the described turbulent pipe (3), make the arrival end (7a) of described throttle pipe (7) be arranged on the front end (3a) of described turbulent pipe (3), and the port of export (7b) of described throttle pipe (7) is arranged in the described turbulent pipe (3) and forms jump classification (8) with this end at described throttle pipe (7), it is characterized in that, an independent coupling collar (11) is set on described throttle pipe (7), and described throttle pipe (7) is fixed to the front end (3a) of described turbulent pipe (3) by this coupling collar (11).

2. turbulent flow generator as claimed in claim 1 (2) is characterized in that, described throttle pipe (7) and/or described coupling collar (11) are plastics throttle pipe (7) and/or plastic tie cyclization (11).

3. turbulent flow generator as claimed in claim 1 (2) is characterized in that, described coupling collar (11) by bonding be connected, threaded engagement connects or form fit connects and is fixed on the described throttle pipe (7).

4. turbulent flow generator as claimed in claim 1 (2) is characterized in that, that the rear end (3b) of the described turbulent pipe (3) of described turbulent flow generator (2) has is roughly rectangular, parallelogram or trapezoidal shape of cross section.