CN203429503U - Visual isobaric rectangular tapered pulp distributor for a hydraulic experimental headbox - Google Patents

Visual isobaric rectangular tapered pulp distributor for a hydraulic experimental headbox Download PDF

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Publication number
CN203429503U
CN203429503U CN201320484103.0U CN201320484103U CN203429503U CN 203429503 U CN203429503 U CN 203429503U CN 201320484103 U CN201320484103 U CN 201320484103U CN 203429503 U CN203429503 U CN 203429503U
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China
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pmma plates
blocks
organic glass
main flow
visual
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CN201320484103.0U
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Chinese (zh)
Inventor
曾劲松
喻迪
黄琨
陈克复
冯郁成
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华南理工大学
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Priority to CN201320484103.0U priority Critical patent/CN203429503U/en
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Abstract

The utility model discloses a visual isobaric rectangular tapered pulp distributor for a hydraulic experimental headbox. The visual isobaric rectangular tapered pulp distributor mainly is formed by combining two organic glass PMMA plates; the sealing between the two organic glass PMMA plates adopts a male and female or tongue-and-groove sealing mode; a dilution water injection opening is formed on one organic glass PMMA plate; after the two organic glass PMMA plates are combined, a hollow cavity and main flow runners which are mutually communicated are formed in the two organic glass PMMA plates; static pressures of all points in the main flow runners are the same; the hollow cavity comprises cavities extending along length directions of the two organic glass PMMA plates and positioned on the two organic glass PMMA plates; a pulp feeding opening and a pulp returning opening are respectively formed in two ends of the hollow cavity; the size of the hollow cavity is gradually reduced in the direction from the pulp feeding opening to the pulp returning opening; the main flow runners comprise grooves extending along width directions of the two organic glass PMMA plates and positioned on the two organic glass PMMA plates; the main flow runners are arranged at intervals along the length directions of the organic glass PMMA plates and are respectively communicated with the corresponding dilution water injection openings. The visual isobaric rectangular tapered pulp distributor can be conveniently used for measurement and visualization research of flow field, has good sealing performance, and is convenient to disassemble.

Description

The visual isobaric step diffuser headbox that a kind of hydraulic experiment head box is used

Technical field

The utility model relates to the technical field of hydraulic experiment head box, refers in particular to the visual isobaric step diffuser headbox that a kind of hydraulic experiment head box is used.

Background technology

Known in the industry, step diffuser headbox is one of critical component of hydraulic pulp flowing box, in order to realize the compress that waits of paper pulp, starches, and home and abroad researcher has carried out correlative study to this, and has obtained many important scientific achievements.

At home, a kind of multitube pulp distributor for cylinder mould machine of Anhui Province papermaking company, is comprised of hole body, cloth slurry cover, square Taper Pipe, labial lamina and support.The square tapered pipe of paper machine pulp distributor of Fujian Xi Yuan Paper Co., Ltd, has hollow cavity, is provided with stock inlet and overfall mouth, and its outside is evenly distributed with grout outlet along its length, and cross section dwindles to overfall mouth direction gradually from stock inlet.The step diffuser headbox of Tianjin Tianqing Paper Manufacturing Machinery Co., Ltd., it is the square taper being formed by connecting by connecting the connecting plate on the oblique waist of two right-angled trapezium limit by two blocks of right-angled trapezium plates, on two blocks of right-angled trapezium plates, be respectively arranged with flange connector, every right-angled trapezium connecting plate is connected with bobbin carriage by flange connector, and bobbin carriage inside is provided with many cloth slurry pores.The complementary cloth device of the utility models such as the Liu Wei of South China Science & Engineering University: being stacked together up and down with complimentary fashion by two step diffuser headboxs forms, symmetrical, not connected, utilize dexterously single step diffuser headbox cloth to starch inhomogeneous feature, realized two quadrate centrum main pipes and the corresponding complementation of propping up tube bank stock quality flow thereof.In addition, the Equi pressure slurry distributor that Liu of South China Science & Engineering University builds peace mainly consists of suction flange, damping element, cylindrical shell, outlet connection, cover and overfall, is mainly suitable for long mesh paper making machine.

In the world, the company that dilution water adjusts dense head box technical development aspect to have several families to make a strong impact, as Beloit (metso) company, Voith company, Valmet (metso) company, and EsherWyss, Vaahto, Brandes & Heneze Gmbh, the PMPOLAND company of G & Lv company, Poland etc., its typical side's taper pulp distributor product mainly contains conical pulp distributor and square taper pulp distributor, and structure is similar, all follow equal pressure principle and design processing, improved significantly quality of paper products.These taper Equi pressure slurry distributors have return-flow system and observe transparent pipe.In return-flow system, adopt return valve to control the backflow of paper pulp, guarantee consistent plasma flow velocity, the pulp flow in observation transparent pipe is determined the unlatching situation of return valve.

Although the step diffuser headbox of home and abroad research is a lot, and these step diffuser headboxs can bring into play very large effect in engineering practice, and these step diffuser headboxs all can not meet the requirement of pulp distributor flow field survey, cannot obtain visual flow field.At present, state, inside and outside there is no the disclosed PIV(Particle of meeting Image Velocimetry particle image ve locity instrument) etc. measuring system measure and the step diffuser headbox of visual research, based on this, step diffuser headbox of the present utility model is meeting on the basis of engineering practice, can measure and visual research the flow field under the various speed of a motor vehicle, thereby the flow field structure that makes step diffuser headbox obtains theoretic breakthrough, can there is good directive function to engineering practice.

Summary of the invention

The purpose of this utility model is to overcome the deficiencies in the prior art, the visual isobaric step diffuser headbox that provides a kind of hydraulic experiment head box that carries out flow field survey and visual research to use, thereby the flow field structure that makes step diffuser headbox obtains theoretic breakthrough, can there is good directive function to engineering practice.

For achieving the above object, technical scheme provided by the utility model is: the visual isobaric step diffuser headbox that a kind of hydraulic experiment head box is used, it is mainly combined into by two blocks of lucite PMMA plates that match, sealing between these two blocks of lucite PMMA plates adopts male and fomale(M&F) or tongue-and-groove seal form, and wherein a lucite PMMA plate is provided with dilution water inlet; After described two lucite PMMA harden and close, be inside formed with the main flow runner that runs through the hollow cavity of its both ends of the surface and run through one side, this main flow runner is communicated with hollow cavity, and in it, static pressure of each point equates; Described hollow cavity is combined by the die cavity extending along length direction separately on two blocks of lucite PMMA plates, and its two ends are respectively equipped with stock inlet and overfall mouth, and this hollow cavity dwindles to the direction of overfall mouth gradually from stock inlet, the side's of formation cone structure; Described main flow runner is formed by the groove combination of extending along width separately on two blocks of lucite PMMA plates, and this main flow runner has many length directions along lucite PMMA plate to be spaced, and is communicated with corresponding dilution water inlet respectively.

After described two lucite PMMA harden and close, by clamp, compress, admittedly be an integral body.

After described two lucite PMMA harden and close, its both ends of the surface that run through by hollow cavity through clamp separately corresponding connect with pulp-inlet pipe enter slurry end connecting plate and with the backflow end connecting plate of return duct, and this pulp-inlet pipe is communicated with stock inlet, this return duct is communicated with overfall mouth.

After described two lucite PMMA harden and close, its side of being run through by main flow runner is provided with the concave surface of sealing use and connects the screwed hole of use.

Described main flow runner is cylindrical runner, and the groove on every block of lucite PMMA plate is semi-cylindrical recesses.

Between described two blocks of lucite PMMA plates, pad has packing ring.

Between described two blocks of lucite PMMA plates that enter to starch end connecting plate and reflux after end connecting plate and combination, pad has packing ring respectively.

Described packing ring is asbestos rubber packing ring.

Compared with prior art, tool has the following advantages and beneficial effect the utility model:

1, applicable PIV(particle image velocimetry) the flow field survey system such as particle image ve locity instrument is measured and visual research, runner and the flow field thereof that can clearly reflect step diffuser headbox, comprise that to the feature of step diffuser headbox speed, vorticity, tubulence energy, dissipative shock wave etc. all can measure very easily and study with the parameter of velocity correlation.

2, little, simple in structure, the good airproof performance of the body of this visual isobaric step diffuser headbox, convenient disassembly, cost are low, can carry out the fluid experiment before engineering practice.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model.

Fig. 2 is that the A of Fig. 1 is to view.

Fig. 3 is that the B of Fig. 1 is to view.

Fig. 4 is that the C of Fig. 1 is to view.

Fig. 5 is the wherein side view of a lucite PMMA plate of the utility model.

Fig. 6 is the side view of the other lucite PMMA plate of the utility model.

Fig. 7 is for adopting PIV measuring system visual isobaric step diffuser headbox to be carried out to the schematic diagram of flow field survey and visual research.

Fig. 8 is that PIV measures the original image in visual isobaric step diffuser headbox turbulent flow process.

Fig. 9 is that PIV measures the original image in visual isobaric step diffuser headbox eddy current process.

Figure 10 is the turbulent flow streamline of the visual isobaric step diffuser headbox after image analysis processing.

Figure 11 is the vortex filament of the visual isobaric step diffuser headbox after image analysis processing.

The specific embodiment

Below in conjunction with specific embodiment, the utility model is described in further detail.

Referring to shown in Fig. 1 to Fig. 6, the visual isobaric step diffuser headbox that hydraulic experiment head box described in the present embodiment is used, it is mainly by two blocks of lucite PMMA plates 1 that match, 2 are combined into, its rear wall is comprised of conic section, these two blocks of lucite PMMA plates 1, sealing between 2 adopts male and fomale(M&F) or tongue-and-groove seal form, and wherein a lucite PMMA plate is provided with dilution water inlet 5(dilution water inlet 5 and is normally arranged on that piece machine glass PMMA plate being positioned at above), by being injected to dilution water, dilution water inlet 5 regulate paper pulp fluid at the cross direction ration of step diffuser headbox, even in cross direction profiles to guarantee paper pulp fluid, after described two blocks of lucite PMMA plates, 1,2 combinations, by clamp 6, compress, admittedly be an integral body, in it, be formed with the hollow cavity 3 that runs through its both ends of the surface and the main flow runner 4 that runs through one side, this main flow runner 4 is communicated with hollow cavity 3, and in it, static pressure of each point equates (according to the equal principle design of flow field each point static pressure), described hollow cavity 3 is to be combined by the die cavity along length direction extends separately on two blocks of lucite PMMA plates 1,2, its two ends are respectively equipped with stock inlet 301 and overfall mouth 302, and this hollow cavity 3 dwindles to the direction of overfall mouth 302 gradually from stock inlet 301, the side's of formation cone structure, described main flow runner 4 is cylindrical runner, it is to be combined by the semi-cylindrical recesses along width extends separately on two blocks of lucite PMMA plates 1,2, in the present embodiment, this cylindrical runner has seven length direction equi-spaced apart along lucite PMMA plate to arrange, and be communicated with corresponding dilution water inlet 5 respectively, and the number of dilution water inlet 5 and the number of cylindrical runner are consistent.

In addition, for being connected of convenient and external component, two blocks of lucite PMMA plates 1 described in the present embodiment, after 2 combinations, its both ends of the surface that run through by hollow cavity 3 through clamp separately 12 corresponding connect with pulp-inlet pipe 701 enter slurry end connecting plate 7 and with the backflow end connecting plate 8 of return duct 801, and this pulp-inlet pipe 701 is communicated with stock inlet 301, this return duct 801 is communicated with overfall mouth 302, this pulp-inlet pipe 701 can be connected with external component easily with return duct 801, and in actual applications, consider corrosion-resistant problem, so the slurry that enters described in the present embodiment is held connecting plate 7, pulp-inlet pipe 701, end connecting plate 8 refluxes, return duct 801 all adopts stainless steel material to make, simultaneously, for conveniently this visual isobaric step diffuser headbox and hydraulic are tested being connected of the next parts of head box, after two blocks of lucite PMMA plates, 1,2 combinations described in the present embodiment, its side of being run through by main flow runner 4 is provided with the concave surface 9 of sealing use and connects a plurality of screwed holes 10 of use, is convenient to and parts male-female seal contact face with bolts below.In order to save cost and enhanced leaktightness, between two blocks of lucite PMMA plates 1,2 described in the present embodiment, pad has asbestos rubber packing ring 11, meanwhile, between two blocks of lucite PMMA plates 1,2 that enter slurry end connecting plate 7 described in and reflux after end connecting plate 8 and combination, also pad has asbestos rubber packing ring 13 respectively.

In addition, in the present embodiment, adopt PIV measuring system to carry out flow field survey and visual research to visual isobaric step diffuser headbox, it is measured and installs specifically as shown in Figure 7, wherein, in PIV measuring process, the sheet light that allows laser instrument produce is mutually vertical with CCD, and the sheet light and the CCD that need continuous mobile laser instrument to produce adjust, for different parts, measure, and the paper pulp lower than 0.01% is housed in cyclic water tank, paper pulp enters the stock inlet 301 of visual isobaric step diffuser headbox from pulp-inlet pipe 701 by paper pulp front pump, then enter the main flow runner 4 of visual isobaric step diffuser headbox, paper pulp major flow is crossed the next parts that main flow runner 4 enters hydraulic experiment head box afterwards, and small part refluxes from overfall mouth 302 outflows of visual isobaric step diffuser headbox, through return duct 801, enter paper pulp circulation line, thereby form the circulation of paper pulp stream.During work, the flow field of visual isobaric step diffuser headbox is taken and measured, and then its image is carried out to analyzing and processing, can obtain the original image in visual isobaric step diffuser headbox turbulent flow, eddy current process, specifically as shown in Figure 8 and Figure 9, can obtain turbulent flow streamline and the vortex filament of visual isobaric step diffuser headbox after image analysis processing, specifically as shown in Figure 10 and Figure 11.Certainly, utilize this cover system, other flow field surveys and visual research that we can also the side's of carrying out taper pulp distributor.

In a word, after adopting above scheme, the utility model is meeting on the basis of engineering practice, can measure and visual research the flow field under the various speed of a motor vehicle, thereby the flow field structure that makes step diffuser headbox obtains theoretic breakthrough, can there is good directive function to engineering practice.Compared to existing technology, the utlity model has that body is little, simple in structure, good airproof performance, convenient disassembly, low cost and other advantages, is a desirable step diffuser headbox, is worthy to be popularized.

The examples of implementation of the above are only the preferred embodiment of the utility model, not with this, limit practical range of the present utility model, therefore the variation that all shapes according to the utility model, principle are done all should be encompassed in protection domain of the present utility model.

Claims (8)

1. a hydraulic is tested the visual isobaric step diffuser headbox that head box is used, it is characterized in that: it is mainly combined into by the two blocks of lucite PMMA plates (1,2) that match, sealing between these two blocks of lucite PMMA plates (1,2) adopts male and fomale(M&F) or tongue-and-groove seal form, and wherein a lucite PMMA plate is provided with dilution water inlet (5); After described two blocks of lucite PMMA plates (1,2) combination, be inside formed with the hollow cavity (3) that runs through its both ends of the surface and the main flow runner (4) that runs through one side, this main flow runner (4) is communicated with hollow cavity (3), and in it, static pressure of each point equates; Described hollow cavity (3) is combined by the die cavity along length direction extends separately on two blocks of lucite PMMA plates (1,2), its two ends are respectively equipped with stock inlet (301) and overfall mouth (302), and this hollow cavity (3) dwindles to the direction of overfall mouth (302) gradually from stock inlet (301), the side's of formation cone structure; Described main flow runner (4) is formed by the groove combination along width extends separately on two blocks of lucite PMMA plates (1,2), and this main flow runner (4) has many length directions along lucite PMMA plate to be spaced, and is communicated with corresponding dilution water inlet (5) respectively.
2. the visual isobaric step diffuser headbox that a kind of hydraulic experiment head box according to claim 1 is used, is characterized in that: after described two blocks of lucite PMMA plates (1,2) combination, compress, admittedly be an integral body by clamp.
3. the visual isobaric step diffuser headbox that a kind of hydraulic experiment head box according to claim 1 is used, it is characterized in that: after described two blocks of lucite PMMA plates (1,2) combination, its both ends of the surface that run through by hollow cavity (3) through clamp separately corresponding connect with pulp-inlet pipe (701) enter slurry end connecting plate (7) and with the backflow end connecting plate (8) of return duct (801), and this pulp-inlet pipe (701) is communicated with stock inlet (301), this return duct (801) is communicated with overfall mouth (302).
4. the visual isobaric step diffuser headbox that a kind of hydraulic experiment head box according to claim 1 is used, it is characterized in that: after described two blocks of lucite PMMA plates (1,2) combination, its side of being run through by main flow runner (4) is provided with the concave surface (9) of sealing use and connects the screwed hole (10) of use.
5. the visual isobaric step diffuser headbox that a kind of hydraulic experiment head box according to claim 1 is used, is characterized in that: described main flow runner (4) is cylindrical runner, and the groove on every block of lucite PMMA plate is semi-cylindrical recesses.
6. the visual isobaric step diffuser headbox that a kind of hydraulic experiment head box according to claim 1 is used, is characterized in that: between described two blocks of lucite PMMA plates (1,2), pad has packing ring.
7. the visual isobaric step diffuser headbox that a kind of hydraulic experiment head box according to claim 3 is used, is characterized in that: described in enter slurry end connecting plate (7) and two blocks of lucite PMMA plates (1,2) of refluxing after end connecting plate (8) and combination between respectively pad have packing ring.
8. the visual isobaric step diffuser headbox of using according to a kind of hydraulic experiment head box described in claim 6 or 7, is characterized in that: described packing ring is asbestos rubber packing ring.
CN201320484103.0U 2013-08-08 2013-08-08 Visual isobaric rectangular tapered pulp distributor for a hydraulic experimental headbox CN203429503U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103437235A (en) * 2013-08-08 2013-12-11 华南理工大学 Hydraulic visualized isobaric step diffuser headbox for experimental headbox
CN104727176A (en) * 2015-03-31 2015-06-24 华南理工大学 Method for machining visualized hydraulic flowing pulp box turbulence generator for experiments
CN104775319A (en) * 2015-03-31 2015-07-15 华南理工大学 Method for machining pulp distributor for experimentally visual hydraulic headbox

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103437235A (en) * 2013-08-08 2013-12-11 华南理工大学 Hydraulic visualized isobaric step diffuser headbox for experimental headbox
CN104727176A (en) * 2015-03-31 2015-06-24 华南理工大学 Method for machining visualized hydraulic flowing pulp box turbulence generator for experiments
CN104775319A (en) * 2015-03-31 2015-07-15 华南理工大学 Method for machining pulp distributor for experimentally visual hydraulic headbox

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Granted publication date: 20140212

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