CN205839467U - A kind of paper cross direction ration adjusting means - Google Patents
A kind of paper cross direction ration adjusting means Download PDFInfo
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- CN205839467U CN205839467U CN201620384608.3U CN201620384608U CN205839467U CN 205839467 U CN205839467 U CN 205839467U CN 201620384608 U CN201620384608 U CN 201620384608U CN 205839467 U CN205839467 U CN 205839467U
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- drain
- adjustment module
- dilution water
- slurry
- quantitative adjustment
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Abstract
The open a kind of paper cross direction ration adjusting means of this utility model, including head box, quantitative adjustment module, concentration regulation unit and flow regulating unit, multiple quantitative adjustment modules are located between the balance cylinder of head box and turbulent flow generator side by side, and concentration regulation unit and flow regulating unit are all connected with each quantitative adjustment module；The inner chamber of each quantitative adjustment module includes that stock inlet, mixing section, steady flow segment and the grout outlet being sequentially connected with, concentration regulation unit are connected with mixing section, and flow regulating unit is connected with steady flow segment.Its method be from concentration regulation unit dilution water first send into quantitative adjustment module, mix with main slurry in mixing section, form diluted slurry and send into steady flow segment, by flow regulating unit, diluted slurry being carried out drain, the slurry flow making each quantitative adjustment module send is equal and pressure is equal.This utility model generation that after avoiding out turbulent flow generator, flow in impact and the lip district of dilution water regulating effect by the mixing of each stock slurry stream.
Description
Technical field
This utility model relates to pulp and paper technology field, particularly to a kind of paper cross direction ration adjusting means.
Background technology
The banner that the invention of local modulation slurry concentration control full width quantitative approach and application greatly increase paper is fixed
Amount level distribution and the uniformity coefficient of fibre orientation.The control method of general dilution water head box is all laterally at cloth along head box
Dilution water is added in slurry tube bank, regulates the slurry concentration of each pipe in cloth slurry tube bank by the amount changing dilution water, thus reach
The purpose of adjusting paper cross direction ration.
Publication No. US6432275B1 american documentation literature proposes a kind of method, and it utilizes slurry in the flowing of pipe
During, show as intermediate concentration high, the principle that tube wall edge concentration is low, in cloth slurry tube bank, enrichment element is installed, starches from cloth
Each comb of tube bank is drawn the fluid that a part of concentration is low, passes through other pipeline more total from entering slurry after enrichment element
Pipe introduces slurry stream and mixes with the slurry stream after enrichment, and the fluid of extraction is equal with the amount of fluid of increase, thus ensures the stream in pipe
Measure constant, and concentration changes, it is achieved thereby that the cross direction ration of regulation paper.But in practice, the method exists three
Problem:
Although the concentration of one tube wall edge slurry stream is lower than middle concentration, but differs limited, therefore by mean concentration
When slurry stream displaces edge low concentration slurry stream to regulate slurry concentration, its amplitude of accommodation is very limited, and effect is the most inconspicuous.
Two, drain arm is arranged between cloth slurry tube bank, and its installation site and size are all interbank by cloth slurry
Away from impact, in order to meet the requirement of uniform cloth slurry, the spacing between cloth slurry tube bank is generally the least, and then drain arm must be very
Little, owing to the slurry concentration drawn and introduce is the biggest, particularly the slurry of introducing pipe is dense is the main mean concentration starching stream, so
Drain arm easily blocks；On the other hand, drain arm must be connected with every pipe in each column cloth slurry pipe again, and this increases the most again
Add the difficulty of processing and manufacturing.
Three, head box generally has an intermediate equilibria room and turbulent flow generator between cloth slurry tube bank and lip district,
Dilution water mixes in cloth slurry tube bank with main slurry stream, but from the shallow bid slurry stream that cloth slurry restrains out, the most unavoidably will
Producing part mixing, meanwhile, resistance produced by the turbulent flow generator of exit, balance cylinder also can promote to starch the mixed of stream in balance cylinder
Close, thus affect the regulating effect of head box banner local slurry stream.It is to say, dense preferable regulation place is starched in local it is not
In the upstream of cloth slurry tube bank, and should be proximate in the turbulent flow generator of lip.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, it is provided that a kind of paper cross direction ration adjusting means,
This device controls paper cross direction ration by local slurry concentration in regulation head box and is distributed, and can be prevented effectively from due to cloth slurry pipe
Bundle each stock slurry stream out mixes the impact on dilution water regulating effect in balance cylinder, it also avoid out turbulent flow generator simultaneously
The generation flow in impact and the lip district of dilution water regulating effect by the mixing of rear each stock slurry stream.
The technical solution of the utility model is: a kind of paper cross direction ration adjusting means, including head box, quantitatively regulates mould
Block, concentration regulation unit and flow regulating unit, the balance cylinder that multiple quantitative adjustment modules are located at head box side by side is sent out with turbulent flow
Between raw device, concentration regulation unit and flow regulating unit are all connected with each quantitative adjustment module；Each quantitative adjustment module interior
Chamber includes that stock inlet, mixing section, steady flow segment and the grout outlet being sequentially connected with, concentration regulation unit are connected with mixing section, and flow is adjusted
Joint unit is connected with steady flow segment.Along slurry stream direction, concentration regulation unit front, flow regulating unit rear, each quantitative tune
Structure and the size of joint module are identical.
The stock inlet of described each quantitative adjustment module is arranged over dilution water entrance, is provided with drain outlet below steady flow segment.
Described concentration regulation unit includes dilution water house steward and dilution water arm, and multiple dilution is distributed on dilution water house steward
Water arm, the port of export correspondence of each dilution water arm is connected with the dilution water entrance in a quantitative adjustment module；
Described flow regulating unit includes drain house steward and drain arm, and multiple drain arm is distributed on drain house steward,
The corresponding outlet with the drain in a quantitative adjustment module of the entrance point of each drain arm is connected.
Described each dilution water arm is respectively equipped with diluting water regulating valve with the junction of dilution water house steward, and each dilution water regulates
Valve external dilution water control system；Each drain arm is respectively equipped with drain regulation valve with the junction of drain house steward, and each drain is adjusted
Joint valve external drain control system.Wherein, diluting water regulating valve is electrodynamic valve, and drain regulation valve is control valve before self-operated type valve,
(dilution water control system and drain control system all can use for the dilution water control system external in conjunction with it or drain control system
The control system that existing equipment is general), can accurately control the flow of dilution water in each dilution water arm, or accurately control each
The slurry flow drawn in drain arm, thus regulate slurry concentration.
Angle between centrage and the centrage of stock inlet of described dilution water entrance is 0～90 °；I.e. dilution water and master
Slurry becomes 0～90 ° of angle to enter in quantitative adjustment module, and it is diluted by the process that dilution water carries out mixing with main slurry.
Angle between centrage and the centrage of steady flow segment of drain outlet is 90 °.
Described quantitative adjustment module includes that dilution joint and current stabilization save, and stock inlet and mixing section are located on dilution joint, current stabilization
Section and grout outlet are located on current stabilization joint, and dilution joint is connected with current stabilization joint becomes an entirety.
The length of described dilution joint is less than the length of current stabilization joint, and the width of dilution joint is equal to the width of current stabilization joint, dilution joint
Height equal to current stabilization joint height.The outlet height depending highly on head box balance cylinder of stock inlet, the width of grout outlet
And size depends on controlling requiring, the spacing of dilution water decanting point and the tube bank arrangement situation of turbulent flow generator, each quantitatively
The width of adjustment module can be equal to the width of one or more columns per page tube bank.
Described stock inlet for rectangle, its height is the most equal with the height of head box balance cylinder, and its width depends on dilution
The spacing of water decanting point and the tube bank arrangement situation of turbulent flow generator, can be equal to the width of one or more columns per page tube bank.
The cross section of described mixing section is circular, square or rectangle, it is also possible to be set to other polygons as required；
When the cross section of mixing section is circular, they are a diameter of 15～20mm years old.
The cross section of described steady flow segment is circular or square, it is also possible to be set to other polygons as required；
When the cross section of steady flow segment is circular, steady flow segment includes inducer, interlude and the outlet section being sequentially connected with, enters
The diameter of mouth section and outlet section is less than interlude, and inducer gradually symmetry expands interlude to, interlude gradually symmetric shrinkage
To outlet section, a diameter of the 30 of interlude～50mm.
Described head box includes, into slurry house steward, cloth slurry tube bank, balance cylinder, turbulent flow generator and lip district, entering to starch house steward, cloth
Slurry tube bank, balance cylinder, turbulent flow generator and lip district are sequentially connected with according to the flow direction of slurry, and quantitative adjustment module is located at flat
Weighing apparatus room and the junction of turbulent flow generator.
A kind of paper cross direction ration control method is realized, particularly as follows: regulate the dilute of unit from concentration according to said apparatus
Release water and first send into quantitative adjustment module, mix with main slurry in mixing section, form diluted slurry and send into steady flow segment, by
Flow regulating unit carries out drain to diluted slurry, and the slurry flow making each quantitative adjustment module send is equal and pressure is equal.
When above-mentioned paper cross direction ration adjusting means and method use, its operation principle is specific as follows:
Slurry by head box balance cylinder, is introduced into quantitative adjustment module, the clear water of dilution water house steward or dilute plain boiled water
After utilizing diluting water regulating valve regulation flow, enter in quantitative adjustment module by dilution water arm, with main slurry in mixing section
Stream is sufficiently mixed, by main slurry diluted stream；Slurry stream after concentration regulates enters steady flow segment, now flow regulating unit action, from
Drain outlet extension slurry, enters drain house steward by drain arm and drains.
The amount drawing slurry in each quantitative adjustment module is controlled, due to head box by its corresponding drain regulation valve regulation
Design and the reason of the aspects such as processing, the flow entering each quantitative adjustment module is not completely equivalent, the slurry flow therefore drawn with
The dilution water flow added is not completely equivalent.Owing to drain valve is control valve before self-operated type valve, whole head box is transversely mounted
Drain valve all presets identical upstream pressure value, and after overpressure predetermined value, valve automatically opens up extraction slurry stream, the pressure exceeded
Being worth the biggest, the slurry stream of extraction is the most, so enters the slurry stream pressure of each arm of turbulent flow generator after flow regulating unit regulates
Power and flow are the most essentially equal.Thus, only need to be controlled the amount that dilution water adds by this device, and correctly set drain valve
Upstream pressure value, can reach accurately to control the purpose of paper cross direction ration, be simultaneously also beneficial to stablizing of longitudinal basis weight.
This utility model, relative to prior art, has the advantages that
The first, due to dilution water and draw slurry stream concentration differ greatly, therefore this paper cross direction ration adjusting means and
Method is the biggest to the scope of concentration regulation and paper cross direction ration regulation.
The second, it is not mounted between turbulent flow tube bank due to drain arm and dilution water arm, but regulates mould in concentration
The above and below of block, thus the size of arm is not affected by turbulent flow tube pitch, can use relatively large caliber, keeps away
The material blocking arms such as the fiber in slurry-free.
3rd, during the process of concentration regulation occurs the cloth slurry tube bank behind balance cylinder rather than before balance cylinder, thus keep away
Exempt from the multiply tributary mixing in the head box balance cylinder impact on concentration regulating effect.
4th, before using self-operated type valve, the size of slurry stream is drawn in control valve regulation, it is ensured that quantitatively adjustment module outlet is each
The pressure of slurry stream is essentially equal.It has not been equal owing to entering the flow of each passage of quantitative adjustment module, therefore we
Method, for the method that the amount drawing slurry stream is equal to dilution water addition, more can reduce the mixing between slurry stream and turbulent flow is sent out
The generation of raw device outlet crossing current.
5th, this paper cross direction ration adjusting means low cost, controls relatively easy.
Accompanying drawing explanation
Fig. 1 is the structural representation of this paper cross direction ration adjusting means.
Fig. 2 is the fragmentary sectional view in A-A direction in Fig. 1.
Fig. 3 is the B-B direction cross sectional view of Fig. 2.
Fig. 4 is the C-C direction cross sectional view of Fig. 2.
Fig. 5 is the D partial enlarged drawing of Fig. 2.
Fig. 6 is the structural representation of quantitative adjustment module.
Fig. 7 is the E direction view of Fig. 6.
Fig. 8 is the F-F direction cross sectional view of Fig. 6.
In above-mentioned each figure, each label is as follows: 1 is dilution water house steward, and 2 is diluting water regulating valve, and 3 is dilution water arm, and 4 are
Quantitatively adjustment module, 4-1 is dilution water entrance, and 4-2 is stock inlet, and 4-3 is mixing section, and 4-4 is drain outlet, and 4-5 is current stabilization
Section, 4-6 is grout outlet, and 5 is drain house steward, and 6 is drain arm, and 7 regulate valve for drain, and 8 starch house steward for entering, and 9 is cloth slurry tube bank,
10 is balance cylinder, and 11 is turbulent flow generator, and 12 is lip district, β be centrage and the stock inlet of dilution water entrance centrage it
Between angle.
Detailed description of the invention
Below in conjunction with embodiment, the utility model is described in further detail, but embodiment of the present utility model
It is not limited to this.
Embodiment
The present embodiment one paper cross direction ration adjusting means, the head box used as it is shown in figure 1, by enter to starch house steward,
Cloth slurry tube bank, balance cylinder, turbulent flow generator and lip district composition.
Paper cross direction ration adjusting means as shown in figures 1-4, regulates unit including head box, quantitative adjustment module, concentration
And flow regulating unit.Quantitatively adjustment module is arranged between head box balance cylinder and turbulent flow generator, dilution water house steward, dilution
Water valve and dilution water arm are sequentially connected, and are arranged on the top of head box, and to together constitute dilution water dense with quantitative adjustment module
Degree regulation system.Drain house steward, drain arm and drain regulation valve are sequentially connected, and are arranged on the lower section of head box, with quantitatively tune
Joint module together constitutes flow control system.
Quantitative adjustment module is entered, in quantitative adjustment module by cloth slurry tube bank, balance cylinder by entering to starch the next slurry of house steward
In, first according to deviation situation and the requirement of paper cross direction ration, dilution water density Adjusting System is along the horizontal interpolation of head box
Appropriate dilution water enters in quantitative adjustment module, and then flow control system draws a certain amount of slurry from quantitative adjustment module
Stream, due to the impact of a variety of causes such as head box design, Finish & Workmanship parameter, balance cylinder enters in each quantitative adjustment module
Slurry flow be not essentially equal, in the most same quantitative adjustment module dilution water add amount with draw slurry stream amount
The most of substantially equal, can there is deviation, thus ensure that the flow entering each arm of turbulent flow generator is essentially equal.
The amount adding dilution water is required to control according to the cross direction ration of paper by diluting water regulating valve, and row's slurry-outlet quantity is many
It is controlled by drain regulation valve less.
Drain regulation valve is control valve before self-operated type valve, and the position of its initial spool is in off position.When upstream pressure (i.e.
The quantitatively pressure of adjustment module middle outlet slurry stream) more than setting value time, draw flow regulating valve and automatically open up, discharge slurry stream, thus control
Upstream pressure processed so that quantitatively in adjustment module 4, the pressure of each outlet slurry stream is essentially equal, so that in turbulent flow generator each
The pressure of pipe, flow are essentially equal.Pressure set points can according to head box spouting velocity, turbulent flow generator drag losses etc. because of
Element calculates.
As in figure 2 it is shown, quantitatively adjustment module has multiple, and the structure of each quantitative adjustment module is identical with size.
Restraining a diameter of Φ 18mm of each pipe in turbulent flow generator, centre-to-centre spacing is 30mm, and design requires each quantitative regulation
Module controls the slurry concentration of adjacent two tubulation bundles, thus, the exit width of each quantitative adjustment module have to be larger than 48mm, examines
Considering to the wall thickness between modules, the width of each quantitative adjustment module is 60mm, and its internal height is equal to the outlet of balance cylinder
Highly, the outlet of each quantitative adjustment module can completely include the import of two tubulation bundles, as it is shown in figure 5, quantitatively adjustment module
Quantity be whole turbulent flow generator tube bank columns half.
As it is shown on figure 3, dilution water arm is arranged on the centre position above quantitative adjustment module, each module width is
60mm, the spacing of dilution water arm is also 60mm, it is possible to as required, the spacing of dilution water arm is reduced or increased, by quantitatively
Each unit of adjustment module regulates the slurry concentration of one or more columns per page to the tube bank of string or more multiple row for slurry, a unit,
Thus regulate the cross direction ration of paper.
As shown in Figure 4, drain arm is arranged on the centre position below quantitative adjustment module, with the spacing of dilution water arm
Identical, the spacing of drain arm is also 60mm, equally also dependent on needs, the spacing of drain arm is reduced or increased.
The structure of single quantitative adjustment module, as shown in Fig. 6, Fig. 7, Fig. 8, can be divided into dilution joint and current stabilization to save.
Dilution joint is made up of dilution water entrance, stock inlet, mixing section, and stock inlet is rectangle, and mixing section is tubular, dilution
Water inlet is opened in the centre of dilution joint upper wall, the import of stock inlet gradually symmetric shrinkage to mixing section, dilution water flow and main slurry stream
Between stock inlet and the mixing section of injection at an angle β each current stabilization joint, β=80 ° in this example.
Current stabilization joint is made up of drain outlet, steady flow segment, grout outlet, and the slurry flow section of steady flow segment is circular, imports and exports little, in
Between section big, grout outlet is rectangle.The slurry stream gradually symmetrical expansion come from mixing section, the most symmetrical contracting after constant current constant voltage
The little entrance to grout outlet, then slurry stream the most gradually symmetry is extended to current stabilization joint outlet.Drain outlet is opened in steady flow segment lower wall
Centre position, is positioned at the lower section of current stabilization joint, for circle, is connected with drain arm, and drain is in 90 ° with main slurry stream draws from head box
Go out.
Quantitatively the overall length of adjustment module is 150mm, and dilution saves a length of 70mm, and current stabilization joint is 80mm.Mixing section a diameter of
Φ 20mm, a length of 40mm, slurry stream is sufficiently mixed in the pipe of mixing section with dilution water.Slurry stream after over-richness regulates
Entering in steady flow segment, the maximum gauge of steady flow segment is Φ 40mm, a length of 50mm, and a diameter of 20mm of draining hole, in drain arm
Footpath is Φ 15mm, drain house steward a diameter of Φ 100mm.Slurry stream after over-richness and Flow-rate adjustment enters the turbulent pipe of head box
Shu Zhong, finally by lip whitewashing online, controls the cross direction ration distribution of paper.
When above-mentioned paper cross direction ration adjusting means uses, its operation principle is specific as follows:
Slurry by head box balance cylinder, is introduced into quantitative adjustment module, the clear water of dilution water house steward or dilute plain boiled water
After utilizing diluting water regulating valve regulation flow, enter in quantitative adjustment module by dilution water arm, with main slurry in mixing section
Stream is sufficiently mixed, by main slurry diluted stream；Slurry stream after concentration regulates enters steady flow segment, now flow regulating unit action, from
Drain outlet extension slurry, enters drain house steward by drain arm and drains.
The amount drawing slurry in each quantitative adjustment module is controlled, due to head box by its corresponding drain regulation valve regulation
Design and the reason of the aspects such as processing, the flow entering each quantitative adjustment module is not completely equivalent, the slurry flow therefore drawn with
The dilution water flow added is not completely equivalent.Owing to drain valve is control valve before self-operated type valve, whole head box is transversely mounted
Drain valve all presets identical upstream pressure value, and after overpressure predetermined value, valve automatically opens up extraction slurry stream, the pressure exceeded
Being worth the biggest, the slurry stream of extraction is the most, so enters slurry flowing pressure and the stream of each arm of turbulent flow generator through Flow-rate adjustment module
Measure the most essentially equal.Thus, only need to be controlled the amount that dilution water adds by this device, and correctly set pressure before the valve of drain valve
Force value, can reach accurately to control the purpose of paper cross direction ration, be simultaneously also beneficial to stablizing of longitudinal basis weight.
As it has been described above, just can preferably realize this utility model, above-described embodiment is only preferable enforcement of the present utility model
Example, is not used for limiting practical range of the present utility model；The most all impartial changes made according to this utility model content and modification,
All contained by this utility model claim scope required for protection.
Claims (8)
1. a paper cross direction ration adjusting means, it is characterised in that include that the regulation of head box, quantitative adjustment module, concentration is single
Unit and flow regulating unit, multiple quantitative adjustment modules are located between the balance cylinder of head box and turbulent flow generator side by side, concentration
Regulation unit and flow regulating unit are all connected with each quantitative adjustment module；The inner chamber of each quantitative adjustment module includes being sequentially connected with
Stock inlet, mixing section, steady flow segment and grout outlet, concentration regulation unit be connected with mixing section, flow regulating unit and steady flow segment
Connect；The stock inlet of described each quantitative adjustment module is arranged over dilution water entrance, is provided with drain outlet below steady flow segment.
A kind of paper cross direction ration adjusting means, it is characterised in that described concentration regulation unit bag
Include dilution water house steward and dilution water arm, multiple dilution water arm, the going out of each dilution water arm on dilution water house steward, are distributed
Mouth end correspondence is connected with the dilution water entrance in a quantitative adjustment module；
Described flow regulating unit includes drain house steward and drain arm, and multiple drain arm is distributed on drain house steward, each
The corresponding outlet with the drain in a quantitative adjustment module of the entrance point of drain arm is connected.
A kind of paper cross direction ration adjusting means, it is characterised in that described each dilution water arm with
The junction of dilution water house steward is respectively equipped with diluting water regulating valve, each diluting water regulating valve external dilution water control system；
Each drain arm is respectively equipped with drain regulation valve with the junction of drain house steward, and each drain regulation external drain of valve controls system
System；Drain regulation valve is control valve before self-operated type valve.
A kind of paper cross direction ration adjusting means, it is characterised in that in described dilution water entrance
Angle between heart line and the centrage of stock inlet is 0～90 °；
Angle between centrage and the centrage of steady flow segment of drain outlet is 90 °.
A kind of paper cross direction ration adjusting means, it is characterised in that in described quantitative adjustment module
Saving including dilution joint and current stabilization, stock inlet and mixing section are located on dilution joint, and steady flow segment and grout outlet are located on current stabilization joint, dilution
Saving is connected with current stabilization joint becomes an entirety.
A kind of paper cross direction ration adjusting means, it is characterised in that the length of described dilution joint is little
In the length of current stabilization joint, the width of dilution joint is equal to the width of current stabilization joint, and the height of dilution joint is equal to the height of current stabilization joint.
A kind of paper cross direction ration adjusting means, it is characterised in that the cross section of described mixing section
For circular, square or rectangle；
When the cross section of mixing section is circular, they are a diameter of 15～20mm years old.
A kind of paper cross direction ration adjusting means, it is characterised in that the horizontal stroke of described steady flow segment
Cross section is circular or square；
When the cross section of steady flow segment is circular, steady flow segment includes inducer, interlude and the outlet section being sequentially connected with, inducer
Being less than interlude with the diameter of outlet section, and inducer gradually symmetry expands interlude to, interlude gradually symmetric shrinkage is to going out
Mouth section, a diameter of the 30 of interlude～50mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620384608.3U CN205839467U (en) | 2016-04-29 | 2016-04-29 | A kind of paper cross direction ration adjusting means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620384608.3U CN205839467U (en) | 2016-04-29 | 2016-04-29 | A kind of paper cross direction ration adjusting means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205839467U true CN205839467U (en) | 2016-12-28 |
Family
ID=57628596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620384608.3U Expired - Fee Related CN205839467U (en) | 2016-04-29 | 2016-04-29 | A kind of paper cross direction ration adjusting means |
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| CN (1) | CN205839467U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105755887A (en) * | 2016-04-29 | 2016-07-13 | 华南理工大学 | Paper transverse width quantitative regulation device and method |
| CN112601858A (en) * | 2018-08-27 | 2021-04-02 | 福伊特专利有限公司 | Turbulent insert |
-
2016
- 2016-04-29 CN CN201620384608.3U patent/CN205839467U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105755887A (en) * | 2016-04-29 | 2016-07-13 | 华南理工大学 | Paper transverse width quantitative regulation device and method |
| CN112601858A (en) * | 2018-08-27 | 2021-04-02 | 福伊特专利有限公司 | Turbulent insert |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161228 Termination date: 20190429 |
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| CF01 | Termination of patent right due to non-payment of annual fee |