CN101433787A - Micropore plate - Google Patents
Micropore plate Download PDFInfo
- Publication number
- CN101433787A CN101433787A CNA2008101848154A CN200810184815A CN101433787A CN 101433787 A CN101433787 A CN 101433787A CN A2008101848154 A CNA2008101848154 A CN A2008101848154A CN 200810184815 A CN200810184815 A CN 200810184815A CN 101433787 A CN101433787 A CN 101433787A
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- CN
- China
- Prior art keywords
- microwell plate
- undercurrent
- plate
- microwell
- microporous plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000012530 fluid Substances 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 7
- 239000000843 powder Substances 0.000 claims description 9
- 239000011159 matrix material Substances 0.000 claims description 7
- 239000000835 fiber Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 102000008186 Collagen Human genes 0.000 claims description 4
- 108010035532 Collagen Proteins 0.000 claims description 4
- 229920001436 collagen Polymers 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000005245 sintering Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 abstract description 11
- 239000011148 porous material Substances 0.000 abstract description 7
- 230000008929 regeneration Effects 0.000 abstract description 3
- 238000011069 regeneration method Methods 0.000 abstract description 3
- 239000002245 particle Substances 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 238000005272 metallurgy Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000001736 capillary Anatomy 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000002910 structure generation Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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- Physical Or Chemical Processes And Apparatus (AREA)
- Apparatus Associated With Microorganisms And Enzymes (AREA)
Abstract
The invention relates to a microporous plate, wherein a plurality of undercurrent channels are arranged inside the whole microporous plate; and a fluid enters into and passes through the undercurrent channels first and then flows out from the microporous surface of the microporous plate. The microporous plate has the advantages that due to the undercurrent channels, the flowing mode of the fluid passing through the microporous plate in the process of various heterogeneous operations and the stress structure of the microporous plate are subjected to qualitative change, and the pressure cancels out each other in the whole microporous plate and is not directly acted on the plane of the microporous plate, so that the pressure-resistant capacity of the microporous plate can be greatly improved, namely the microporous plate can bear high pressure difference fluid and can not be deformed and broken; solid particles in a heterogeneous system are difficult to be blocked into pores of the microporous plate for a long time, and the microporous plate can be subjected to backflushing regeneration through simple high-pressure gas, so that the service life of the microporous plate is greatly prolonged.
Description
Technical field
The present invention relates to a kind of porous article, relate in particular to a kind of be used for gas-solid in the industrial department productions such as chemical industry, light industry, metallurgy, building materials, transportation and heterogeneous operation such as liquid-solid (as mix, separate, absorption, conveying, reaction etc.) microwell plate.
Background technology
At industrial departments such as chemical industry, light industry, metallurgy, building materials and transportations, liquid-solid and heterogeneous operations such as gas-solid (as mix, separate, absorption, conveying, reaction etc.) very general, in these operations, need a kind of rigidity or inferior rigidity microwell plate mostly, fluid can pass microwell plate and flow, and solid must keep off on the microwell plate surface, the surperficial pore of microwell plate must distribute more even, fluid will be stablized by the pore flow velocity, can make all heterogeneous operation rate and operating efficiency keep high value.
Grew up in nearest 30 years very little rigidity in various capillarys aperture or inferior rigidity microwell plate is more even for gas-solid and liquid-solid heterogeneous system provide a kind of fluid to distribute, and can stop fine grain microwell plate, has obtained more and more the application.Nearest more than ten years, the development of superfine powder industry makes powder granule more and more thin, the superfine powder fine grained very easily is blocked in the pore of microwell plate, the resistance of plate is increased fast, reduce service life, running cost rises, through discovering as the microwell plate that has stopped up being carried out quick blowback with gases at high pressure or liquid, the resistance of microwell plate is significantly descended, the fast quick-recovery of permeance property, this " pulse cleaning " technology has become the regeneration measure of simple and efficient, but it is bigger to size, the microwell plate that outer surface does not allow to add ribs is difficult to adopt, because can make the very fast gross distortion of microwell plate of large-size during blowback, causes breaking.As shown in Figure 1, be the structure and the compressive deformation schematic diagram of a kind of microwell plate of prior art, 1 is the microwell plate before the distortion, and 2 are the microwell plate after the distortion, and 3 for high-pressure fluid advances, and 4 for high-pressure fluid goes out, and 5 is shear surface.This microwell plate is used for heterogeneous operating system, and fluid all is that a surface is advanced by the flow model of microwell plate, and another surface goes out.Can't bear the high-pressure fluid blowback, because when fluid advances the high pressure blowback that another side goes out from one side, large tracts of land is stressed simultaneously on whole plane, make microwell plate bear very large flexure stress of total power and shearing stress, the protruding distortion of the as easy as rolling off a log outward bulge of microwell plate makes around the microwell plate stationary plane edge easily be sheared and breaks.
In order to prevent distortion and to break, once developed folder one deck expanded metal in microwell plate both at home and abroad, form the interlayer microwell plate of sandwich type, this method can prevent distortion substantially and break as being used for the not too big microwell plate of size.But following defective is arranged: because matrix material is different with the coefficient of expansion of metallic porous sheet, cause metallic plate and matrix layering, sandwich plate loses booster action, and especially when the microwell plate size surpassed 1 meter, situation was more serious.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of virtually any size and Any shape all can bear the microwell plate of the quick blowback of high pressure.
To achieve these goals, technical solution of the present invention is such: a kind of microwell plate, in the microwell plate of integral body, be provided with some undercurrent passages, and fluid at first enters and process from the undercurrent passage, and the micropore face from microwell plate comes out again.
The invention has the beneficial effects as follows: because these undercurrent passages make the fluid of microwell plate in gas-solid and liquid-solid various heterogeneous operation by the flow pattern of microwell plate and the change of microwell plate force structure generation matter, pressure is cancelled out each other in the microwell plate of integral body, do not act directly on the plane of microwell plate, its voltage endurance capability can improve greatly, can bear the High Pressure Difference fluid, indeformable, do not break, the particle of solid is difficult for being blocked in for a long time in the pore of microwell plate in the heterogeneous system, microwell plate can prolong service life greatly with simple and easy gases at high pressure pulse cleaning.
Description of drawings
Fig. 1 is the structure and the compressive deformation schematic diagram of a kind of microwell plate of prior art;
Fig. 2 is the structural representation of embodiments of the invention 1;
Fig. 3 is the A-A cutaway view of Fig. 2;
Fig. 4 is the direction of flow schematic diagram of Fig. 2;
Fig. 5 is the direction of flow schematic diagram of Fig. 3;
Fig. 6 is the structural representation of embodiments of the invention 2;
Fig. 7 is the B-B cutaway view of Fig. 6;
Fig. 8 is the structural representation of embodiments of the invention 3;
Fig. 9 is the structural representation of embodiments of the invention 4.
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples:
Microwell plate of the present invention is made by the heat-agglomerating method by the powder or the loosen collagen fibre of metal species or mineral-type or high score subclass basic material.Also can by filter cloth or filter screen or filter paper by by the bonding pressing or earlier bonding back sintering make.Also can by the powder of metal species or mineral-type or high score subclass basic material or loosen collagen fibre and filter cloth or filter screen or filter paper mix the back earlier bonding back sintering make.Its structure is to be provided with some undercurrent passages in the microwell plate of integral body, and fluid at first enters and process from the undercurrent passage, and the micropore face from microwell plate comes out again.
Shown in Fig. 2-5, embodiment 1 for a kind of microwell plate, be in the microwell plate 6 of integral body, be provided with some with the parallel undercurrent passage 7 of the plate face of microwell plate 6 (above 8 and following 9), fluid enters undercurrent passage 7 at first from the side, come out from the one side of microwell plate 6 (above 8 or below 9) again, the impermeable fluid of one side is promptly arranged.Also can be simultaneously come out, the equal fluid permeable in two sides (micropore face) is promptly arranged from two sides (above 8 and below 9).Described undercurrent passage 7 one dimensions are arranged in parallel, and the axis of undercurrent passage 7 is a straight line.The cross sectional shape of described undercurrent passage 7 is circular, also can be ellipse, square, rectangle, triangle or other shapes.
Shown in Fig. 6-7, be a kind of embodiment 2 of microwell plate, described undercurrent passage is the two-dimentional netted arrangement that interconnects, and is promptly intersected by transversely arranged undercurrent passage 12 and vertical undercurrent passage of arranging 13 to form, the axis of undercurrent passage also is a straight line.Be a specific embodiment below: raw material is the ultra high molecular polyethylene powder, make 1700 * 1700 * 25mm rigidity microwell plate with the mould of 1700 * 1700 * 25mm, lay in the mould in length and breadth and respectively be 50, diameter is the mould pipe of the undercurrent passage of 10mm, make 1700 * 1700 * 25 through heat-agglomerating and have in length and breadth that the quadrature diameter of bore is the netted undercurrent passage of 10mm, the square rigid macromolecule microwell plate that the plate upper and lower surface all can seepage flow.As another kind of structure, also be provided with through hole 14 in the one side of microwell plate 6 and be communicated with undercurrent passage 7, fluid can be entered from the one side of microwell plate 6, come out from another side through undercurrent passage 7 backs.
As shown in Figure 8, be a kind of embodiment 3 of microwell plate, described microwell plate is made pipe.Be a specific embodiment below: at diameter is φ 1000mm, and high is pack in the cylindrical mold chamber of 1500mm high density polyethylene (HDPE) and pore former.Making diameter is φ 1000mm, height is 1500mm, thick is the cylindrical shape micropore tube of 30mm, the impermeable fluid of micropore tube outer surface, but inner surface seepage flow body, the centre-to-centre spacing of packing in cylindrical mold is 25mm, diameter is the vertical standpipe of φ 12mm, laterally be the undercurrent passage mould of the cylinder net form of circle, through hot briquetting, the demoulding, to make the outer surface of φ 1000 * 1500 * 30mm at last impermeable, the inner surface porous has the micropore tube of netted intersection φ 12mm endoporus in the plate.
As shown in Figure 9, be a kind of embodiment 4 of microwell plate, described microwell plate is made arc, the netted arrangement that the undercurrent passage interconnects for two dimension, axis along the axial arranged undercurrent passage of arc is a straight line, is camber line along the axis of the undercurrent passage of the circumferential arrangement of arc.Be a specific embodiment below: in a radius of curvature is R850mm, bowstring is long to be 1000mm, height is 1500mm, the space is wide to be in the 30mm mould, packing into, to form the aperture be φ 10mm, hole centre-to-centre spacing is the 25mm netted undercurrent passage mould of quadrature in length and breadth, the mixed silica flour of will filling a prescription by a certain percentage then, the polypropylene fiber powder, mixed powder such as adhesive and the pore former mould of packing into, compacting, be heated to uniform temperature again, keep certain hour, cooling and demolding promptly makes the arc microwell plate with dies cavity size basically identical, the equal fluid permeable in the inside and outside two sides of this plate.
Certainly, described microwell plate also can be made into other different shapes such as radius of curvature is different up and down conical camber plate or conical pipe.
Among the above embodiment,, bear high pressure fluid before exosmosis and jet flow by all undercurrent vias inner walls because high-pressure fluid is to be distributed to earlier in many minor diameter undercurrent passages by the microwell plate matrix.And microwell plate shown in Figure 1 when high-pressure fluid during to exosmosis and jet flow, be stressed by microwell plate by all area matrixes of microwell plate, it is much smaller that therefore microwell plate of the present invention bears the pressure of high-pressure fluid.If the stressed diameter of microwell plate shown in Figure 1 is D, and same appearance and size, same shape, the undercurrent channel diameter of the microwell plate of the present invention of same base material and same micropore size is d, the flexure stress that microwell plate then of the present invention bears has only microwell plate shown in Figure 1
If D=500mm, d=20mm, then
If the stressed diameter of microwell plate shown in Figure 1 is 500mm, can only bear the 0.005MPa fluid pressure, many diameters are arranged is the undercurrent passage of 20mm and same shape and size microwell plate are made inside, then the pressure that can bear can improve more than 600 times, can bear 3MPa pressure, as long as fluid has 1MPa pressure to carry out pulse cleaning, this microwell plate just reaches the regeneration efficiency more than 99% basically in fact, and the service life of microwell plate is just very long.
Considerable undercurrent passage will be made in microwell plate of the present invention inside, and the size of undercurrent passage should meet following two requirements with arrangement:
1, fluid must be along plate surface uniformly penetrating from microwell plate surface turnover, and can not some regional flow very big, a little regional flows be very little in addition.
When 2, high-pressure fluid enters in the microwell plate undercurrent passage, local matrix or large tracts of land matrix can not occur near the undercurrent passage and be torn phenomenon.
Meet this two requirement, the design of the undercurrent passage of microwell plate must meet the following conditions simultaneously: d * L=(0.5～0.7) * F,
Wherein:
F is whole microwell plate surface area (cm
2);
D be undercurrent passage internal diameter (to circle) or undercurrent passage maximum cross-section width (to non-circular) (cm);
L is the total length (cm) of all undercurrent passages;
T is the centre-to-centre spacing (cm) between the two undercurrent passages;
P is high pressure fluid (kg/cm
2);
[σ] is the tensile strength (kg/cm of microwell plate matrix
2);
H is the thickness (cm) of microwell plate.
Claims (10)
1, a kind of microwell plate is characterized in that: be provided with some undercurrent passages in the microwell plate of integral body, fluid at first enters and process from the undercurrent passage, and the micropore face from microwell plate comes out again.
2, a kind of microwell plate according to claim 1 is characterized in that: the plate face of described undercurrent passage and microwell plate be arranged in parallel, and fluid enters the undercurrent passage at first from the side, and the one or both sides from microwell plate come out again.
3, a kind of microwell plate according to claim 1, it is characterized in that: the plate face of described undercurrent passage and microwell plate be arranged in parallel, one side at microwell plate is provided with through hole and undercurrent channel connection, and fluid enters from the one side of microwell plate, through coming out from another side behind the undercurrent passage.
4, according to claim 1 or 2 or 3 described a kind of microwell plates, it is characterized in that: described microwell plate is made by the heat-agglomerating method by the powder or the loosen collagen fibre of metal species or mineral-type or high score subclass basic material.
5, according to claim 1 or 2 or 3 described a kind of microwell plates, it is characterized in that: described microwell plate by filter cloth or filter screen or filter paper by by the bonding pressing or earlier bonding back sintering make.
6, according to claim 1 or 2 or 3 described a kind of microwell plates, it is characterized in that: described microwell plate by the powder of metal species or mineral-type or high score subclass basic material or loosen collagen fibre and filter cloth or filter screen or filter paper mix the back earlier bonding back sintering make.
7, according to claim 1 or 2 or 3 described a kind of microwell plates, it is characterized in that: institute
The netted arrangement that the undercurrent passage one dimension of stating is arranged in parallel or two dimension interconnects.
8, a kind of microwell plate according to claim 6 is characterized in that:
d×L＝(0.5～0.7)×F，
Wherein:
F is whole microwell plate surface area (cm
2);
D be undercurrent passage internal diameter (to circle) or undercurrent passage maximum cross-section width (to non-circular) (cm);
L is the total length (cm) of all undercurrent passages;
T is the centre-to-centre spacing (cm) between the two undercurrent passages;
P is high pressure fluid (kg/cm
2);
[σ] is the tensile strength (kg/cm of microwell plate matrix
2);
H is the thickness (cm) of microwell plate.
9, according to claim 1 or 2 or 3 described a kind of microwell plates, it is characterized in that: the cross sectional shape of described undercurrent passage is for circular.
10, according to claim 1 or 2 or 3 described a kind of microwell plates, it is characterized in that: described microwell plate is made pipe or conical pipe or arc or conical camber plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101848154A CN101433787B (en) | 2008-11-28 | 2008-11-28 | Micropore plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101848154A CN101433787B (en) | 2008-11-28 | 2008-11-28 | Micropore plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101433787A true CN101433787A (en) | 2009-05-20 |
| CN101433787B CN101433787B (en) | 2010-10-13 |
Family
ID=40708517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101848154A Active CN101433787B (en) | 2008-11-28 | 2008-11-28 | Micropore plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101433787B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101974031A (en) * | 2010-10-13 | 2011-02-16 | 温州市东瓯微孔过滤有限公司 | Glyphosate reaction filter method and special filter for glyphosate thereof |
| CN103734076A (en) * | 2014-01-10 | 2014-04-23 | 王连成 | Method for manufacturing oxygen enrichment microporous plates for bottoms of ponds of aquaculture tanks for aquatic products |
| CN104569377A (en) * | 2013-10-09 | 2015-04-29 | 上海交通大学 | Microporous plate for high throughput detection and application thereof |
| CN112007428A (en) * | 2020-09-07 | 2020-12-01 | 洛阳理工学院 | Composite sintered plate, preparation method thereof and sintered plate type dust remover |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2671662Y (en) * | 2003-10-23 | 2005-01-19 | 张明文 | Fine filter liquor filter sheet |
| CN200957333Y (en) * | 2006-10-16 | 2007-10-10 | 牛晓波 | Filter of cooker hood |
| CN201333351Y (en) * | 2008-11-28 | 2009-10-28 | 温州市东瓯微孔过滤有限公司 | Microporous plate |
-
2008
- 2008-11-28 CN CN2008101848154A patent/CN101433787B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101974031A (en) * | 2010-10-13 | 2011-02-16 | 温州市东瓯微孔过滤有限公司 | Glyphosate reaction filter method and special filter for glyphosate thereof |
| CN101974031B (en) * | 2010-10-13 | 2015-10-07 | 浙江东瓯过滤机制造有限公司 | A kind of reacted filtering method of glyphosate and Special glyphosate filter thereof |
| CN104569377A (en) * | 2013-10-09 | 2015-04-29 | 上海交通大学 | Microporous plate for high throughput detection and application thereof |
| CN103734076A (en) * | 2014-01-10 | 2014-04-23 | 王连成 | Method for manufacturing oxygen enrichment microporous plates for bottoms of ponds of aquaculture tanks for aquatic products |
| CN112007428A (en) * | 2020-09-07 | 2020-12-01 | 洛阳理工学院 | Composite sintered plate, preparation method thereof and sintered plate type dust remover |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101433787B (en) | 2010-10-13 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: ZHEJIANG DONG'OU FILTERING MACHINERY MANUFACTURING Effective date: 20120810 Owner name: SHANGHAI HONGLI PURIFYING TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: DONGOU MICROPOROUS FILTERING CO. LTD., WENZHOU CITY Effective date: 20120810 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Song Xianhong Inventor after: Song Zhili Inventor before: Song Xianhong |
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| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 325003 WENZHOU, ZHEJIANG PROVINCE TO: 201799 QINGPU, SHANGHAI Free format text: CORRECT: INVENTOR; FROM: SONG XIANHONG TO: SONG XIANHONG SONG ZHILI |
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| TR01 | Transfer of patent right |
Effective date of registration: 20120810 Address after: 201799, Shanghai District, Qingpu Park Road 99, Shun Pu building, 2 floor, I District, room 286 Patentee after: Shanghai Hongli Purification Technology Co., Ltd. Patentee after: Zhejiang Dongou Filter Manufacturing Co., Ltd. Address before: Yangfushan in Lucheng District of Wenzhou City, Zhejiang province 325003 Tu village industrial zone south Patentee before: Dongou Microporous Filtering Co., Ltd., Wenzhou City |
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| TR01 | Transfer of patent right |
Effective date of registration: 20210325 Address after: No.85-2, Shiniu Road, Shuige Industrial Park, Lishui City, Zhejiang Province 323000 Patentee after: ZHEJIANG DONGOU FILTER MANUFACTURING Co.,Ltd. Address before: Room 286, area I, 2nd floor, Shunpu building, 99 Gongyuan Road, Qingpu District, Shanghai, 201799 Patentee before: SHANGHAI HONGLI PURIFICATION TECHNOLOGY Co.,Ltd. Patentee before: ZHEJIANG DONGOU FILTER MANUFACTURING Co.,Ltd. |
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| TR01 | Transfer of patent right |