CN107351369A - A kind of design method of the plenum chamber group with flaring profiled orifice plate - Google Patents

A kind of design method of the plenum chamber group with flaring profiled orifice plate Download PDF

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CN107351369A
CN107351369A CN201710537268.2A CN201710537268A CN107351369A CN 107351369 A CN107351369 A CN 107351369A CN 201710537268 A CN201710537268 A CN 201710537268A CN 107351369 A CN107351369 A CN 107351369A
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mrow
msub
area
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plenum chamber
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CN107351369B (en
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张宏
李巍
史健玮
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Dalian University of Technology
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Dalian University of Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
    • B29C35/045—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using gas or flames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
    • B29C35/06—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam for articles of indefinite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
    • B29C35/045—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using gas or flames
    • B29C2035/046—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using gas or flames dried air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

A kind of design method of the plenum chamber group with flaring profiled orifice plate of the present invention belongs to the design field of synchronous bidirectional stretching-machine plenum chamber group, is related to a kind of design method of the plenum chamber group with flaring profiled orifice plate in lithium battery film synchronous bidirectional stretching-machine.The mode that this method is arranged based on existing plenum chamber group aperture, the open area of each area's orifice plate is preset according to the change of each area's film transverse direction tentering, air output is preset with opening area width incremental mode.According to the arrangement of existing aperture and open area, the relation in perforated area and aperture is established；The relation established according to orifice-metering coefficient between orifice feeding area and air output.Its relation with aperture is obtained by decay formula, more than simultaneous the pore size of the every group of plenum chamber group orifice plate in each area is calculated in three groups of relations.The plenum chamber group with flaring profiled orifice plate of this method design enables to the cycle-index of hot blast to increase, a large amount of to reduce air output and mend air quantity, realizes the purpose of energy-saving and emission-reduction.

Description

A kind of design method of the plenum chamber group with flaring profiled orifice plate
Technical field
The invention belongs to the design field of synchronous bidirectional stretching-machine plenum chamber group, is related to a kind of lithium battery film synchronous bidirectional The design method of plenum chamber group with flaring profiled orifice plate in stretching-machine.
Background technology
In the production technology that high-end lithium battery film is produced by biaxial tension, temperature and velocity uniformity are for film Thickness evenness and the continuity of stretching have material impact.Plenum chamber as a kind of conventional casing for evenly distributing gas, Its suitable structure can significantly increase film heat setting energy, be to ensure that temperature is uniformly closed at hot air heating system air outlet Key production equipment.Due to the limitation of space and set structure, plenum chamber volume cannot design excessive, it is necessary to be set inside it More structures, such as uniform orifice plate, deflector, special-shaped, the spout regulation in section etc. are put, to ensure the uniform of air nozzle speed.
Guilin Co., Ltd of Electro Scientific research institute in 2015 appoints small dragon et al. in Publication No. CN205185295U reality With disclosing " a kind of slit air port plenum chamber film transversal stretching device ", slit air port described in the device in new patent It is in 20~80 ° of angles with film direction of advance, angle is with the reduction of solvent to be evaporated contained by each section of Polyamic Acid Film And increase, heated place's temperature homogeneity is the method increase, improves product surface quality and film roll flatness.Dalian Yi Ke energy Source Science and Technology Ltd. disclosed " one kind in 2016 in green for a long time et al. in Publication No. CN105936123A patent of invention Biaxial stretching film transverse stretching machine is with group bellows bilateral to blowing apparatus ", increasing tilting dividing plate among plenum chamber makes both sides blower fan to blowing Air change wind direction, the unilateral air-supply compared with conventional films transverse stretching machine can more have the function that air outlet, and pressure is balanced everywhere.
Abroad, Mohammadkhah et al. opinions delivered in PROCESS DESIGN AND CONTROL periodicals in 2009 Text《Effect of Geometry of the Plenum Chamber on Gas Distribution in a Fluidized Bed》In, using CFD analogy methods, have studied on the basis of AND DEWATERING FOR ORIFICE STRUCTURE is constant including air supply direction, gear The fluid bed plenum chamber scheme of eight kinds of different structures such as harden structure, entrance location is to velocity profile and the influence of pressure drop.Hideki Nakamura et al. was in United States Patent (USP) " the Reflow Furnace And Heater in Patent No. US7988031B2 in 2011 Hot blast present in preheating zone and the main heating zone in existing hot air type reflow furnaces is directed in For Blowing Hot Air " With the problem of non-uniform of oxygen concentration, three groups of orifice plates using aperture and hole number as variable are separately designed and have been tested, found to work as When main heating zone unit perforated area is 1.5-5 times of preheating zone, the uniformity of each area's hot blast and oxygen concentration can be improved, also can Meet the long timeliness heating of preheating low temp area and the requirement that main heating zone is quickly heated.
It was found from being studied more than, plenum chamber aperture plate is to influence the important feature that gas is evenly distributed.Traditional plenum chamber group The air supply mode of orifice plate is abound with using aperture, this arrangement mode can undoubtedly cause huge energy loss, especially be drawn in diaphragm Width is also in less scope, and the blowing of diaphragm both sides aperture is not heated to diaphragm simply to be spilt into insulated building, also Understand near film side by upper and lower plenum chamber aperture to blowing, the impact jet flow directly to diaphragm heating is upset, so as to influence entirely to protect The uniformity of hot house flow field.
The content of the invention
The defects of present invention is to overcome prior art, invent a kind of plenum chamber group design side with flaring profiled orifice plate Method, the mode that this method is arranged based on existing plenum chamber group aperture, the air output in each area is preset, avoids in-site installation tune To the blindness examination value of blower fan air output during examination, each area's fan frequency conversion controller is only finely tuned in values, you can meet film Requirement of the piece to cold air blast velocity.Traditional every group of plenum chamber orifice plate is overcome using the plenum chamber group with flaring profiled orifice plate and uses hole Mouth is abound with the structure of comprehensive air-supply of orifice plate, and enabling to the cycle-index of hot blast increases, a large amount of to reduce air output and mend air quantity, Realize the purpose of energy-saving and emission-reduction.
The technical solution adopted by the present invention is a kind of design method of the plenum chamber group with flaring profiled orifice plate, it is characterized in that, The mode that this method is arranged based on existing plenum chamber group aperture, each area hole is preset according to the change of each area's film transverse direction tentering The open area of plate, air output is preset with opening area width incremental mode；According to the arrangement of existing aperture and perforate Scope, establish the relation in perforated area and aperture；Established according to orifice-metering coefficient between orifice feeding area and air output Relation, the wind velocity that goes out of orifice surface is treated according to isothermal jet main paragraph central speed, it is obtained by decay formula With the relation in aperture；It is more than simultaneous that the pore size of the every group of plenum chamber group orifice plate in each area is calculated in three groups of relations；Design method Comprise the following steps that：
The first step：Determine every group of each area air output Qij
Plenum chamber group arrangement with flaring profiled orifice plate in synchronous bidirectional stretching-machine, including preheating zone, drawing zone and thermal finalization Area of three, area, wherein preheating zone include Zone1, Zone2 and Zone3 three parts, and drawing zone includes Zone4, Zone5 and Zone6 Three parts, heat set zone include Zone7 and Zone8 two parts；Per subregion Zonei, 1≤i≤8 are by arrangement symmetrical above and below Four groups of static pressure casings composition；
The change on diaphragm tentering is not present due to preheating zone and heat set zone, according to existing process data by preheating zone Zone1, Zone2 and Zone3 air output are set as Qp, Zone7 in heat set zone and Zone8 air output is set as Qs, Only each group plenum chamber air output in drawing zone Zone4, Zone5 and Zone6 is adjusted, QijThat is Representative Region Zonei jth group Zonei, the air output size of 1≤i≤8,1≤j≤4；According to the change of each area's film transverse direction tentering, every group of Qu Dingge areas orifice plate Along the opening area width w of flow directionij, wherein preheating zone opening area width w11=w12=...=w34=w0, heat set zone is opened Bore region width w71=w72=...=w84=w1, each group air output is calculated as follows：
Air output is preset with opening area width incremental mode；
Second step：Determine the perforate number N of every group of each area orifice plateij
According to the engineering distribution form of abacus in practice, take and flow to pitch of holes S1, open up to pitch of holes S2, open up to adjacent Holes staggers distance S in flow direction3, according to exhibition to perforate row 4, take S3=S1/ 4, determine every group of each area plenum chamber perforate number For：
3rd step：Determine the aperture d of every group of each area orifice plateij
Orifice plate perforated area is：
Meet relation between orifice feeding area and air output again：
In formula, μ is orifice-metering coefficient, typically takes μ=0.78~0.82；
Wind velocity v is gone out to orifice surfaceij, treated according to isothermal jet main paragraph central speed, using air port as Starting point, its decay formula are as follows：
In formula, vm(ij)The wind speed blown to for Zonei areas jth group on diaphragm；A is dimensionless turbulence factor, to different air ports Form then has different a values；D is distance of the orifice plate to diaphragm；Orifice surface goes out wind velocity vijWith aperture dijBetween pass System, by above-mentioned formula simultaneous, tries to achieve aperture dij：
So far, the plenum chamber group arrangement with flaring profiled orifice plate in whole synchronous bidirectional stretching-machine, including preheating zone, drawing are obtained Stretch area and the area of heat set zone three, the pore size of each every group of plenum chamber group orifice plate in area.
The beneficial effects of the invention are as follows the open area for determining orifice plate per cluster film width according to each area, more traditional every group quiet The structure of the comprehensive cloth wind of case orifice plate is pressed, the plenum chamber group with flaring profiled orifice plate enables to the cycle-index of hot blast to increase, greatly Amount reduces air output and mends air quantity, realizes the purpose of energy-saving and emission-reduction；Traditional plenum chamber group is improved at film side edge by quiet up and down The phenomenon of impact jet flow is upset in pressure case aperture to blowing, from the uniformity and diaphragm quality for improving whole insulated building flow field；To sending The default of air quantity avoids during site installation test blindly examination value, and each area's fan frequency conversion control can be adjusted near preset value Device adjusts according to actual conditions.
Brief description of the drawings
Fig. 1 is the stereogram of traditional plenum chamber group, wherein, I-upside static pressure casing, II-downside static pressure casing, 1- inlet airs Mouthful, 2- orifice plates, 3- baffle plates, 4- apertures, 5- diaphragms, the direction of arrow-diaphragm moving direction.
Fig. 2 is the front view of traditional plenum chamber group, wherein, Zone1, Zone2, Zone3- preheating zone, Zone4, Zone5, Zone6- drawing zones, Zone7, Zone8- heat set zone, D are orifice plate to the distance of diaphragm, unit, m.
Fig. 3 is the top view of traditional plenum chamber group, wherein, 2- orifice plates, 4- apertures, Zone1, Zone2, Zone3- preheating Area, Zone4, Zone5, Zone6- drawing zone, Zone7, Zone8- heat set zone.
Fig. 4 each group air output distribution maps, wherein, abscissa is each group #, and ordinate is single plenum chamber pair in every group The air output answered, unit, m3/h。
Fig. 5 is aperture arrangement schematic diagram, wherein, 2- orifice plates, 4- apertures, S1- flow to pitch of holes, S2- open up to pitch of holes, S3‐ Open up the distance to stagger to adjacent holes in flow direction.
Fig. 6 is the bi-directional synchronization stretching-machine plenum chamber group top view with flaring profiled orifice plate.Wherein, wij- aperture area field width Degree, dij- aperture, Nij- perforate number.
Embodiment
Describe the embodiment of the present invention in detail below in conjunction with technical scheme, but it is not thereby limiting the invention Protection domain.
Plenum chamber group arrangement symmetrical above and below in traditional film biaxial orientation stretching machine, every group of plenum chamber include upper and lower side static pressure Casing I, II, as shown in Figure 1.Plenum chamber group is provided with air intake vent 1, orifice plate 2, baffle plate 3, aperture 4 and diaphragm 5.Hot blast is from inlet air Mouth 1 enters static pressure casing, the hot blast in casing is flow under hydrostatic pressure through the rectification of orifice plate 2 and is projected through aperture 4, blows to diaphragm Make diaphragm thermally equivalent on 5, as shown in Figure 2 and Figure 3.In traditional film biaxial orientation stretching machine plenum chamber group, using cloth on orifice plate 2 The air supply mode in full aperture 4, to meet the wind speed requirement in each area, it need to only set the air output Q of each group plenum chamber in same area0 It is identical, it just can realize that area's inner orifice goes out the uniformity of wind velocity.But this arrangement mode undoubtedly can cause huge energy to damage Consumption, is especially also in less scope in diaphragm tentering, and the blowing of diaphragm both sides aperture is not heated to diaphragm simply escapes Be scattered in insulated building, can also near film side by upper and lower plenum chamber aperture to blowing, upset the impact jet flow directly to diaphragm heating, So as to influence the uniformity of whole insulated building flow field.Because every group of each area plenum chamber group both sides above and below diaphragm are arranged symmetrically, To analyze and describing conveniently, embodiment takes and carries out analysis calculating to the air supply mode of flaring profiled orifice plate exemplified by unilateral plenum chamber. Method comprises the following steps that：
The first step, determine the single plenum chamber air output Q in every group of each areaij
Plenum chamber group arrangement with flaring profiled orifice plate in synchronous bidirectional stretching-machine, including preheating zone, drawing zone and thermal finalization Area of three, area, wherein preheating zone include Zone1, Zone2 and Zone3 three parts, and drawing zone includes Zone4, Zone5 and Zone6 Three parts, heat set zone include Zone7 and Zone8 two parts；Per subregion Zonei, 1≤i≤8 are by arrangement symmetrical above and below Four groups of static pressure casings composition；
The change on diaphragm tentering is not present due to preheating zone and heat set zone, according to existing process data by preheating zone Zone1, Zone2 and Zone3 air output are set as Qp, Zone7 in heat set zone and Zone8 air output is set as Qs, Only each group plenum chamber air output in drawing zone Zone4, Zone5 and Zone6 is adjusted, QijThat is Representative Region Zonei jth group Zonei, the air output size of 1≤i≤8,1≤j≤4；According to the change of each area's film transverse direction tentering, every group of Qu Dingge areas orifice plate Along the opening area width w of flow directionij, wherein preheating zone opening area width w11=w12=...=w34=w0=1m, thermal finalization Area opening area width w71=w72=...=w84=w1=4.6m, remaining every group true in the change of each area's tentering according to diaphragm Determine aperture widths w of the orifice plate along flow directionijAs shown in table 1：
Aperture widths w of every group of 1 each area of table orifice plate along flow directionij
Because film tentering does not change in preheating zone and heat set zone, preheating zone can be set according to existing process data Middle Zone1, Zone2 and Zone3 single plenum chamber air output Qp=2347.6m3/ h, Zone7, Zone8's send in heat set zone Air quantity Qs=7414.1m3/ h, it is horizontal by each area's film to each group plenum chamber air output in drawing zone Zone4, Zone5 and Zone6 Change to tentering is preset by formula (1), obtains the single plenum chamber air output value such as table 2 in every group of each area：
Every group of 2 each area of table air output
Second step, determine the perforate number N of every group of each area orifice plateij
Take and flow to pitch of holes S1=0.1m, open up to pitch of holes S2=0.0885m, it is determined that open up to adjacent holes in flow direction it is wrong Open distance S3, it is n=4 according to opening up to perforate row, takes S3=S1/ 4=0.025m, every group of each area static pressure is determined according to formula (2) Case perforate number is as shown in table 3：
The perforate number N of every group of 3 each area of table orifice plateij
3rd step, determine the aperture d of every group of each area orifice plateij
The speed v that each every group of static pressure casing in area is blown on diaphragmm(ij)It is taken as according to technological requirement：
Preheating zone：vm(ij)=30m/s (1≤i≤3,1≤j≤4)；
Drawing zone：vm(ij)=25m/s (4≤i≤6,1≤j≤4)；
Heat set zone：vm(ij)=25m/s (7≤i≤8,1≤j≤4).
According to Tr ü pel andThe experiment in laboratory, will to the uniform flow field of circular hole jet exit initial velocity Dimensionless turbulence factor is taken as a=0.066；Discharge coefficient μ is typically relevant with approximate aperture ratio and Reynolds number, influences efflux coefficient Factor it is more, take μ=0.78 here, according to formula (2), (3), (4), (5) calculate, wherein, the distance D=of orifice plate to diaphragm 0.255m, result of calculation need to be finely tuned near preset value with field adjustable Comparative result according to actual conditions to air output.
By upper, further according to formula (6)Obtain the aperture of the every group of plenum chamber orifice plate in each area dij, as shown in table 4：
The aperture d of every group of 4 each area of table plenum chamber orifice plateij
So far, the plenum chamber group arrangement with flaring profiled orifice plate in whole synchronous bidirectional stretching-machine is obtained, sees Fig. 6, including it is pre- The pore size of the every group of plenum chamber group orifice plate in hot-zone, drawing zone and heat set zone and each area.

Claims (1)

1. a kind of design method of the plenum chamber group with flaring profiled orifice plate, it is characterized in that, this method is based on existing plenum chamber group hole The mode of mouth arrangement, the open area of each area's orifice plate is preset according to the change of each area's film transverse direction tentering, with opening area The incremental mode of width is preset to air output；According to the arrangement of existing aperture and open area, perforated area and aperture are established Relation；The relation established according to orifice-metering coefficient between orifice feeding area and air output；Wind speed is gone out to orifice surface Degree is treated according to isothermal jet main paragraph central speed, and its relation with aperture is obtained by decay formula；More than simultaneous three The pore size of the every group of plenum chamber group orifice plate in each area is calculated in group relation；Design method comprises the following steps that：
The first step：Determine every group of each area air output Qij
Plenum chamber group arrangement with flaring profiled orifice plate in synchronous bidirectional stretching-machine, including preheating zone, drawing zone and heat set zone three Individual area, wherein preheating zone include Zone1, Zone2 and Zone3 three parts, and drawing zone includes Zone4, Zone5 and Zone6 tri- Point, heat set zone includes Zone7 and Zone8 two parts；Per subregion Zonei, 1≤i≤8 are by the four of arrangement symmetrical above and below Group static pressure casing composition；
The change on diaphragm tentering is not present due to preheating zone and heat set zone, according to existing process data by preheating zone Zone1, Zone2 and Zone3 air output are set as Qp, Zone7 in heat set zone and Zone8 air output is set as Qs, Only each group plenum chamber air output in drawing zone Zone4, Zone5 and Zone6 is adjusted, QijThat is Representative Region Zonei jth group Zonei, the air output size of 1≤i≤8,1≤j≤4；According to the change of each area's film transverse direction tentering, every group of Qu Dingge areas orifice plate Along the opening area width w of flow directionij, wherein preheating zone opening area width w11=w12=...=w34=w0, heat set zone is opened Bore region width w71=w72=...=w84=w1, each group air output is calculated as follows：
<mrow> <msub> <mi>Q</mi> <mrow> <mi>i</mi> <mi>j</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mrow> <msub> <mi>Q</mi> <mi>S</mi> </msub> <mo>-</mo> <msub> <mi>Q</mi> <mi>p</mi> </msub> </mrow> <mrow> <msub> <mi>w</mi> <mn>1</mn> </msub> <mo>-</mo> <msub> <mi>w</mi> <mn>0</mn> </msub> </mrow> </mfrac> <mrow> <mo>(</mo> <msub> <mi>w</mi> <mrow> <mi>i</mi> <mi>j</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>w</mi> <mn>0</mn> </msub> <mo>)</mo> </mrow> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>
Air output is preset with opening area width incremental mode；
Second step：Determine the perforate number N of every group of each area orifice plateij
According to the engineering distribution form of abacus in practice, take and flow to pitch of holes S1, open up to pitch of holes S2, open up to adjacent holes The distance that staggers in flow direction S3, according to exhibition to perforate row 4, take S3=S1/ 4, determine that every group of each area plenum chamber perforate number is：
<mrow> <msub> <mi>N</mi> <mrow> <mi>i</mi> <mi>j</mi> </mrow> </msub> <mo>=</mo> <mrow> <mo>(</mo> <mfrac> <msub> <mi>w</mi> <mrow> <mi>i</mi> <mi>j</mi> </mrow> </msub> <msub> <mi>S</mi> <mn>1</mn> </msub> </mfrac> <mo>+</mo> <mn>1</mn> <mo>)</mo> </mrow> <mo>&amp;times;</mo> <mn>4</mn> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow>
3rd step：Determine the aperture d of every group of each area orifice plateij
Orifice plate perforated area is：
<mrow> <msub> <mi>f</mi> <mrow> <mi>i</mi> <mi>j</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mrow> <msub> <mi>&amp;pi;N</mi> <mrow> <mi>i</mi> <mi>j</mi> </mrow> </msub> <msup> <msub> <mi>d</mi> <mrow> <mi>i</mi> <mi>j</mi> </mrow> </msub> <mn>2</mn> </msup> </mrow> <mn>4</mn> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow>
Meet relation between orifice feeding area and air output again：
<mrow> <msub> <mi>f</mi> <mrow> <mi>i</mi> <mi>j</mi> </mrow> </msub> <mo>=</mo> <mfrac> <msub> <mi>Q</mi> <mrow> <mi>i</mi> <mi>j</mi> </mrow> </msub> <mrow> <mn>3600</mn> <msub> <mi>v</mi> <mrow> <mi>i</mi> <mi>j</mi> </mrow> </msub> <mi>&amp;mu;</mi> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>4</mn> <mo>)</mo> </mrow> </mrow>
In formula, μ is orifice-metering coefficient, typically takes μ=0.78~0.82；
Wind velocity v is gone out to orifice surfaceij, treated according to isothermal jet main paragraph central speed, using air port as starting point, Its decay formula is as follows：
<mrow> <mfrac> <msub> <mi>v</mi> <mrow> <mi>m</mi> <mrow> <mo>(</mo> <mrow> <mi>i</mi> <mi>j</mi> </mrow> <mo>)</mo> </mrow> </mrow> </msub> <msub> <mi>v</mi> <mrow> <mi>i</mi> <mi>j</mi> </mrow> </msub> </mfrac> <mo>=</mo> <mfrac> <mn>0.48</mn> <mfrac> <mrow> <mi>a</mi> <mi>D</mi> </mrow> <msub> <mi>d</mi> <mrow> <mi>i</mi> <mi>j</mi> </mrow> </msub> </mfrac> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>5</mn> <mo>)</mo> </mrow> </mrow>
In formula, vm(ij)The wind speed blown to for Zonei areas jth group on diaphragm；A is dimensionless turbulence factor, to different outlet styles Then there are different a values；D is distance of the orifice plate to diaphragm；Orifice surface goes out wind velocity vijWith aperture dijBetween relation, will Above-mentioned formula simultaneous, try to achieve aperture dij：
<mrow> <msub> <mi>d</mi> <mrow> <mi>i</mi> <mi>j</mi> </mrow> </msub> <mo>=</mo> <mfrac> <msub> <mi>Q</mi> <mrow> <mi>i</mi> <mi>j</mi> </mrow> </msub> <mrow> <mn>1875</mn> <msub> <mi>&amp;pi;a&amp;mu;DN</mi> <mrow> <mi>i</mi> <mi>j</mi> </mrow> </msub> <msub> <mi>v</mi> <mrow> <mi>m</mi> <mrow> <mo>(</mo> <mrow> <mi>i</mi> <mi>j</mi> </mrow> <mo>)</mo> </mrow> </mrow> </msub> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>6</mn> <mo>)</mo> </mrow> </mrow>
So far, the plenum chamber group arrangement with flaring profiled orifice plate in whole synchronous bidirectional stretching-machine, including preheating zone, drawing zone are obtained With the area of heat set zone three, the pore size of each every group of plenum chamber group orifice plate in area.
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CN113119439A (en) * 2021-04-08 2021-07-16 贵州科泰天兴农业科技有限公司 Precise control system and control method for mulching film diameter
CN113752600A (en) * 2021-08-23 2021-12-07 四川东方绝缘材料股份有限公司 Production line of polarizer release film base film and preparation method thereof

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CN105546778A (en) * 2015-12-20 2016-05-04 西安建筑科技大学 Plenum chamber capable of achieving balanced ventilation
CN105936123A (en) * 2016-07-08 2016-09-14 大连伊科能源科技有限公司 Blowing device using opposite blower fans arranged on two sides of same set of bellows of biaxial stretched film horizontally pulling machine

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JPS60164218A (en) * 1984-02-07 1985-08-27 Nikkiso Co Ltd Pitot tube type flowmeter
CN102069585A (en) * 2010-12-17 2011-05-25 大连橡胶塑料机械股份有限公司 Biaxial synchronous orientation stretcher
CN102490741A (en) * 2011-12-13 2012-06-13 南车株洲电力机车有限公司 Air supply uniformity regulating system for lower static-pressure type air duct
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CN113119439A (en) * 2021-04-08 2021-07-16 贵州科泰天兴农业科技有限公司 Precise control system and control method for mulching film diameter
CN113752600A (en) * 2021-08-23 2021-12-07 四川东方绝缘材料股份有限公司 Production line of polarizer release film base film and preparation method thereof
CN113752600B (en) * 2021-08-23 2023-10-13 四川东方绝缘材料股份有限公司 Production line of polarizer release film base film and preparation method thereof

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